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freebsd-nq/module/zfs/zpl_inode.c

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Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
Linux 4.1 compat: loop device on ZFS Starting from Linux 4.1 allows iov_iter with bio_vec to be passed into iter_read/iter_write. Notably, the loop device will pass bio_vec to backend filesystem. However, current ZFS code assumes iovec without any check, so it will always crash when using loop device. With the restructured uio_t, we can safely pass bio_vec in uio_t with UIO_BVEC set. The uio* functions are modified to handle bio_vec case separately. The const uio_iov causes some warning in xuio related stuff, so explicit convert them to non const. Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3511 Closes #3640
2015-07-30 14:24:36 +00:00
* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
*/
Linux 3.18 compat: Snapshot auto-mounting Re-factor the .zfs/snapshot auto-mouting code to take in to account changes made to the upstream kernels. And to lay the groundwork for enabling access to .zfs snapshots via NFS clients. This patch makes the following core improvements. * All actively auto-mounted snapshots are now tracked in two global trees which are indexed by snapshot name and objset id respectively. This allows for fast lookups of any auto-mounted snapshot regardless without needing access to the parent dataset. * Snapshot entries are added to the tree in zfsctl_snapshot_mount(). However, they are now removed from the tree in the context of the unmount process. This eliminates the need complicated error logic in zfsctl_snapshot_unmount() to handle unmount failures. * References are now taken on the snapshot entries in the tree to ensure they always remain valid while a task is outstanding. * The MNT_SHRINKABLE flag is set on the snapshot vfsmount_t right after the auto-mount succeeds. This allows to kernel to unmount idle auto-mounted snapshots if needed removing the need for the zfsctl_unmount_snapshots() function. * Snapshots in active use will not be automatically unmounted. As long as at least one dentry is revalidated every zfs_expire_snapshot/2 seconds the auto-unmount expiration timer will be extended. * Commit torvalds/linux@bafc9b7 caused snapshots auto-mounted by ZFS to be immediately unmounted when the dentry was revalidated. This was a consequence of ZFS invaliding all snapdir dentries to ensure that negative dentries didn't mask new snapshots. This patch modifies the behavior such that only negative dentries are invalidated. This solves the issue and may result in a performance improvement. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3589 Closes #3344 Closes #3295 Closes #3257 Closes #3243 Closes #3030 Closes #2841
2015-04-24 23:21:13 +00:00
#include <sys/zfs_ctldir.h>
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
#include <sys/zfs_vfsops.h>
#include <sys/zfs_vnops.h>
Add .zfs control directory Add support for the .zfs control directory. This was accomplished by leveraging as much of the existing ZFS infrastructure as posible and updating it for Linux as required. The bulk of the core functionality is now all there with the following limitations. *) The .zfs/snapshot directory automount support requires a 2.6.37 or newer kernel. The exception is RHEL6.2 which has backported the d_automount patches. *) Creating/destroying/renaming snapshots with mkdir/rmdir/mv in the .zfs/snapshot directory works as expected. However, this functionality is only available to root until zfs delegations are finished. * mkdir - create a snapshot * rmdir - destroy a snapshot * mv - rename a snapshot The following issues are known defeciences, but we expect them to be addressed by future commits. *) Add automount support for kernels older the 2.6.37. This should be possible using follow_link() which is what Linux did before. *) Accessing the .zfs/snapshot directory via NFS is not yet possible. The majority of the ground work for this is complete. However, finishing this work will require resolving some lingering integration issues with the Linux NFS kernel server. *) The .zfs/shares directory exists but no futher smb functionality has yet been implemented. Contributions-by: Rohan Puri <rohan.puri15@gmail.com> Contributiobs-by: Andrew Barnes <barnes333@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #173
2011-11-11 07:15:53 +00:00
#include <sys/zfs_znode.h>
Use spa as key besides objsetid for snapentry objsetid is not unique across pool, so using it solely as key would cause panic when automounting two snapshot on different pools with the same objsetid. We fix this by adding spa pointer as additional key. Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3948 Issue #3786 Issue #3887
2015-12-07 23:43:53 +00:00
#include <sys/dmu_objset.h>
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
#include <sys/vfs.h>
#include <sys/zpl.h>
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
#include <sys/file.h>
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
static struct dentry *
Linux 3.6 compat, iops->lookup() As of Linux commit 00cd8dd3bf95f2cc8435b4cac01d9995635c6d0b the struct nameidata is no longer passed to iops->lookup. Instead only the inamedata->flags are passed. ZFS like almost all Linux fileystems never made use of this so only the prototype needs to be wrapped for compatibility. Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #873
2012-10-12 14:41:06 +00:00
#ifdef HAVE_LOOKUP_NAMEIDATA
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
Linux 3.6 compat, iops->lookup() As of Linux commit 00cd8dd3bf95f2cc8435b4cac01d9995635c6d0b the struct nameidata is no longer passed to iops->lookup. Instead only the inamedata->flags are passed. ZFS like almost all Linux fileystems never made use of this so only the prototype needs to be wrapped for compatibility. Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #873
2012-10-12 14:41:06 +00:00
#else
zpl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
#endif
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
{
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
struct inode *ip;
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Fix casesensitivity=insensitive deadlock When casesensitivity=insensitive is set for the file system, we can deadlock in a rename if the user uses different case for each path. For example rename("A/some-file.txt", "a/some-file.txt"). The simple test for this is: 1. mkdir some-dir in a ZFS file system 2. touch some-dir/some-file.txt 3. mv Some-dir/some-file.txt some-dir/some-other-file.txt This last request deadlocks trying to relock the i_mutex on the inode for the parent directory. The solution is to use d_add_ci in zpl_lookup if we are on a file system that has the casesensitivity=insensitive attribute set. This patch checks if we are working on a case insensitive file system and if so, allocates storage for the case insensitive name and passes it to zfs_lookup and then calls d_add_ci instead of d_splice_alias. The performance impact seems to be minimal even though we have introduced a kmalloc and kfree in the lookup path. The problem was found when running Microsoft's FSCT against Samba on top of ZFS On Linux. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4136
2015-12-28 00:08:05 +00:00
pathname_t *ppn = NULL;
pathname_t pn;
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
int zfs_flags = 0;
Fix casesensitivity=insensitive deadlock When casesensitivity=insensitive is set for the file system, we can deadlock in a rename if the user uses different case for each path. For example rename("A/some-file.txt", "a/some-file.txt"). The simple test for this is: 1. mkdir some-dir in a ZFS file system 2. touch some-dir/some-file.txt 3. mv Some-dir/some-file.txt some-dir/some-other-file.txt This last request deadlocks trying to relock the i_mutex on the inode for the parent directory. The solution is to use d_add_ci in zpl_lookup if we are on a file system that has the casesensitivity=insensitive attribute set. This patch checks if we are working on a case insensitive file system and if so, allocates storage for the case insensitive name and passes it to zfs_lookup and then calls d_add_ci instead of d_splice_alias. The performance impact seems to be minimal even though we have introduced a kmalloc and kfree in the lookup path. The problem was found when running Microsoft's FSCT against Samba on top of ZFS On Linux. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4136
2015-12-28 00:08:05 +00:00
zfs_sb_t *zsb = dentry->d_sb->s_fs_info;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Add explicit MAXNAMELEN check It turns out that the Linux VFS doesn't strictly handle all cases where a component path name exceeds MAXNAMELEN. It does however appear to correctly handle MAXPATHLEN for us. The right way to handle this appears to be to add an explicit check to the zpl_lookup() function. Several in-tree filesystems handle this case the same way. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1279
2013-02-11 20:55:24 +00:00
if (dlen(dentry) > ZFS_MAXNAMELEN)
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
return (ERR_PTR(-ENAMETOOLONG));
Add explicit MAXNAMELEN check It turns out that the Linux VFS doesn't strictly handle all cases where a component path name exceeds MAXNAMELEN. It does however appear to correctly handle MAXPATHLEN for us. The right way to handle this appears to be to add an explicit check to the zpl_lookup() function. Several in-tree filesystems handle this case the same way. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1279
2013-02-11 20:55:24 +00:00
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Fix casesensitivity=insensitive deadlock When casesensitivity=insensitive is set for the file system, we can deadlock in a rename if the user uses different case for each path. For example rename("A/some-file.txt", "a/some-file.txt"). The simple test for this is: 1. mkdir some-dir in a ZFS file system 2. touch some-dir/some-file.txt 3. mv Some-dir/some-file.txt some-dir/some-other-file.txt This last request deadlocks trying to relock the i_mutex on the inode for the parent directory. The solution is to use d_add_ci in zpl_lookup if we are on a file system that has the casesensitivity=insensitive attribute set. This patch checks if we are working on a case insensitive file system and if so, allocates storage for the case insensitive name and passes it to zfs_lookup and then calls d_add_ci instead of d_splice_alias. The performance impact seems to be minimal even though we have introduced a kmalloc and kfree in the lookup path. The problem was found when running Microsoft's FSCT against Samba on top of ZFS On Linux. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4136
2015-12-28 00:08:05 +00:00
/* If we are a case insensitive fs, we need the real name */
if (zsb->z_case == ZFS_CASE_INSENSITIVE) {
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
zfs_flags = FIGNORECASE;
Fix casesensitivity=insensitive deadlock When casesensitivity=insensitive is set for the file system, we can deadlock in a rename if the user uses different case for each path. For example rename("A/some-file.txt", "a/some-file.txt"). The simple test for this is: 1. mkdir some-dir in a ZFS file system 2. touch some-dir/some-file.txt 3. mv Some-dir/some-file.txt some-dir/some-other-file.txt This last request deadlocks trying to relock the i_mutex on the inode for the parent directory. The solution is to use d_add_ci in zpl_lookup if we are on a file system that has the casesensitivity=insensitive attribute set. This patch checks if we are working on a case insensitive file system and if so, allocates storage for the case insensitive name and passes it to zfs_lookup and then calls d_add_ci instead of d_splice_alias. The performance impact seems to be minimal even though we have introduced a kmalloc and kfree in the lookup path. The problem was found when running Microsoft's FSCT against Samba on top of ZFS On Linux. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4136
2015-12-28 00:08:05 +00:00
pn.pn_bufsize = ZFS_MAXNAMELEN;
pn.pn_buf = kmem_zalloc(ZFS_MAXNAMELEN, KM_SLEEP);
ppn = &pn;
}
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
error = -zfs_lookup(dir, dname(dentry), &ip, zfs_flags, cr, NULL, ppn);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
spl_fstrans_unmark(cookie);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
spin_lock(&dentry->d_lock);
dentry->d_time = jiffies;
Use sb->s_d_op default dentry operations As of Linux 2.6.37 the right way to register custom dentry operations is to use the super block's ->s_d_op field. For older kernels they should be registered as part of the lookup operation. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1223
2013-01-18 22:11:40 +00:00
#ifndef HAVE_S_D_OP
d_set_d_op(dentry, &zpl_dentry_operations);
#endif /* HAVE_S_D_OP */
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
spin_unlock(&dentry->d_lock);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
if (error) {
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
/*
* If we have a case sensitive fs, we do not want to
* insert negative entries, so return NULL for ENOENT.
* Fall through if the error is not ENOENT. Also free memory.
*/
if (ppn) {
Fix casesensitivity=insensitive deadlock When casesensitivity=insensitive is set for the file system, we can deadlock in a rename if the user uses different case for each path. For example rename("A/some-file.txt", "a/some-file.txt"). The simple test for this is: 1. mkdir some-dir in a ZFS file system 2. touch some-dir/some-file.txt 3. mv Some-dir/some-file.txt some-dir/some-other-file.txt This last request deadlocks trying to relock the i_mutex on the inode for the parent directory. The solution is to use d_add_ci in zpl_lookup if we are on a file system that has the casesensitivity=insensitive attribute set. This patch checks if we are working on a case insensitive file system and if so, allocates storage for the case insensitive name and passes it to zfs_lookup and then calls d_add_ci instead of d_splice_alias. The performance impact seems to be minimal even though we have introduced a kmalloc and kfree in the lookup path. The problem was found when running Microsoft's FSCT against Samba on top of ZFS On Linux. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4136
2015-12-28 00:08:05 +00:00
kmem_free(pn.pn_buf, ZFS_MAXNAMELEN);
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
if (error == -ENOENT)
return (NULL);
}
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
if (error == -ENOENT)
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
return (d_splice_alias(NULL, dentry));
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
else
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
return (ERR_PTR(error));
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
}
Fix casesensitivity=insensitive deadlock When casesensitivity=insensitive is set for the file system, we can deadlock in a rename if the user uses different case for each path. For example rename("A/some-file.txt", "a/some-file.txt"). The simple test for this is: 1. mkdir some-dir in a ZFS file system 2. touch some-dir/some-file.txt 3. mv Some-dir/some-file.txt some-dir/some-other-file.txt This last request deadlocks trying to relock the i_mutex on the inode for the parent directory. The solution is to use d_add_ci in zpl_lookup if we are on a file system that has the casesensitivity=insensitive attribute set. This patch checks if we are working on a case insensitive file system and if so, allocates storage for the case insensitive name and passes it to zfs_lookup and then calls d_add_ci instead of d_splice_alias. The performance impact seems to be minimal even though we have introduced a kmalloc and kfree in the lookup path. The problem was found when running Microsoft's FSCT against Samba on top of ZFS On Linux. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4136
2015-12-28 00:08:05 +00:00
/*
* If we are case insensitive, call the correct function
* to install the name.
*/
if (ppn) {
struct dentry *new_dentry;
struct qstr ci_name;
ci_name.name = pn.pn_buf;
ci_name.len = strlen(pn.pn_buf);
new_dentry = d_add_ci(dentry, ip, &ci_name);
kmem_free(pn.pn_buf, ZFS_MAXNAMELEN);
return (new_dentry);
} else {
return (d_splice_alias(ip, dentry));
}
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
}
Add .zfs control directory Add support for the .zfs control directory. This was accomplished by leveraging as much of the existing ZFS infrastructure as posible and updating it for Linux as required. The bulk of the core functionality is now all there with the following limitations. *) The .zfs/snapshot directory automount support requires a 2.6.37 or newer kernel. The exception is RHEL6.2 which has backported the d_automount patches. *) Creating/destroying/renaming snapshots with mkdir/rmdir/mv in the .zfs/snapshot directory works as expected. However, this functionality is only available to root until zfs delegations are finished. * mkdir - create a snapshot * rmdir - destroy a snapshot * mv - rename a snapshot The following issues are known defeciences, but we expect them to be addressed by future commits. *) Add automount support for kernels older the 2.6.37. This should be possible using follow_link() which is what Linux did before. *) Accessing the .zfs/snapshot directory via NFS is not yet possible. The majority of the ground work for this is complete. However, finishing this work will require resolving some lingering integration issues with the Linux NFS kernel server. *) The .zfs/shares directory exists but no futher smb functionality has yet been implemented. Contributions-by: Rohan Puri <rohan.puri15@gmail.com> Contributiobs-by: Andrew Barnes <barnes333@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #173
2011-11-11 07:15:53 +00:00
void
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
zpl_vap_init(vattr_t *vap, struct inode *dir, zpl_umode_t mode, cred_t *cr)
Honor setgit bit on directories Newly created files were always being created with the fsuid/fsgid in the current users credentials. This is correct except in the case when the parent directory sets the 'setgit' bit. In this case according to posix the newly created file/directory should inherit the gid of the parent directory. Additionally, in the case of a subdirectory it should also inherit the 'setgit' bit. Finally, this commit performs a little cleanup of the vattr_t initialization by moving it to a common helper function. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #262
2011-07-20 20:10:07 +00:00
{
vap->va_mask = ATTR_MODE;
vap->va_mode = mode;
vap->va_uid = crgetfsuid(cr);
if (dir && dir->i_mode & S_ISGID) {
Linux 3.8 compat: Support CONFIG_UIDGID_STRICT_TYPE_CHECKS When CONFIG_UIDGID_STRICT_TYPE_CHECKS is enabled uid_t/git_t are replaced by kuid_t/kgid_t, which are structures instead of integral types. This causes any code that uses an integral type to fail to build. The User Namespace functionality introduced in Linux 3.8 requires CONFIG_UIDGID_STRICT_TYPE_CHECKS, so we could not build against any kernel that supported it. We resolve this by converting between the new kuid_t/kgid_t structures and the original uid_t/gid_t types. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1589
2013-07-14 16:59:24 +00:00
vap->va_gid = KGID_TO_SGID(dir->i_gid);
Honor setgit bit on directories Newly created files were always being created with the fsuid/fsgid in the current users credentials. This is correct except in the case when the parent directory sets the 'setgit' bit. In this case according to posix the newly created file/directory should inherit the gid of the parent directory. Additionally, in the case of a subdirectory it should also inherit the 'setgit' bit. Finally, this commit performs a little cleanup of the vattr_t initialization by moving it to a common helper function. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #262
2011-07-20 20:10:07 +00:00
if (S_ISDIR(mode))
vap->va_mode |= S_ISGID;
} else {
vap->va_gid = crgetfsgid(cr);
}
}
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
static int
Linux 3.6 compat, iops->create() As of Linux commit ebfc3b49a7ac25920cb5be5445f602e51d2ea559 the struct nameidata is no longer passed to iops->create. Instead only the result of (inamedata->flags & LOOKUP_EXCL) is passed. ZFS like almost all Linux fileystems never made use of this so only the prototype needs to be wrapped for compatibility. Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #873
2012-10-12 15:20:58 +00:00
#ifdef HAVE_CREATE_NAMEIDATA
Linux 3.3 compat, iops->create()/mkdir()/mknod() The mode argument of iops->create()/mkdir()/mknod() was changed from an 'int' to a 'umode_t'. To prevent a compiler warning an autoconf check was added to detect the API change and then correctly set a zpl_umode_t typedef. There is no functional change. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #701
2012-04-30 19:01:49 +00:00
zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
struct nameidata *nd)
Linux 3.6 compat, iops->create() As of Linux commit ebfc3b49a7ac25920cb5be5445f602e51d2ea559 the struct nameidata is no longer passed to iops->create. Instead only the result of (inamedata->flags & LOOKUP_EXCL) is passed. ZFS like almost all Linux fileystems never made use of this so only the prototype needs to be wrapped for compatibility. Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #873
2012-10-12 15:20:58 +00:00
#else
zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
bool flag)
#endif
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
{
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
struct inode *ip;
vattr_t *vap;
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
zpl_vap_init(vap, dir, mode, cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Directory xattr znodes hold a reference on their parent Unlike normal file or directory znodes, an xattr znode is guaranteed to only have a single parent. Therefore, we can take a refernce on that parent if it is provided at create time and cache it. Additionally, we take care to cache it on any subsequent zfs_zaccess() where the parent is provided as an optimization. This allows us to avoid needing to do a zfs_zget() when setting up the SELinux security xattr in the create path. This is critical because a hash lookup on the directory will deadlock since it is locked. The zpl_xattr_security_init() call has also been moved up to the zpl layer to ensure TXs to create the required xattrs are performed after the create TX. Otherwise we run the risk of deadlocking on the open create TX. Ideally the security xattr should be fully constructed before the new inode is unlocked. However, doing so would require far more extensive changes to ZFS. This change may also have the benefitial side effect of ensuring xattr directory znodes are evicted from the cache before normal file or directory znodes due to the extra reference. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #671
2012-11-30 00:10:03 +00:00
error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
if (error == 0) {
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
d_instantiate(dentry, ip);
Safely handle security / ACL failures The security and ACL operations should all be performed atomically. To accomplish this there would need to significant invasive changes made to the common code base. For the moment it's desirable for compatibility reasons to avoid this. Therefore the code has been updated to attempt to unwind the operation in case of failure rather than panic. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2445
2014-07-02 21:47:02 +00:00
error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
if (error == 0)
error = zpl_init_acl(ip, dir);
if (error)
(void) zfs_remove(dir, dname(dentry), cr);
Directory xattr znodes hold a reference on their parent Unlike normal file or directory znodes, an xattr znode is guaranteed to only have a single parent. Therefore, we can take a refernce on that parent if it is provided at create time and cache it. Additionally, we take care to cache it on any subsequent zfs_zaccess() where the parent is provided as an optimization. This allows us to avoid needing to do a zfs_zget() when setting up the SELinux security xattr in the create path. This is critical because a hash lookup on the directory will deadlock since it is locked. The zpl_xattr_security_init() call has also been moved up to the zpl layer to ensure TXs to create the required xattrs are performed after the create TX. Otherwise we run the risk of deadlocking on the open create TX. Ideally the security xattr should be fully constructed before the new inode is unlocked. However, doing so would require far more extensive changes to ZFS. This change may also have the benefitial side effect of ensuring xattr directory znodes are evicted from the cache before normal file or directory znodes due to the extra reference. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #671
2012-11-30 00:10:03 +00:00
}
Extend PF_FSTRANS critical regions Additional testing has shown that the region covered by PF_FSTRANS needs to be extended to cover the zpl_xattr_security_init() and init_acl() functions. The zpl_mark_dirty() function can also recurse and therefore must always be protected. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Closes #3331
2015-04-23 17:09:19 +00:00
spl_fstrans_unmark(cookie);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(vap, sizeof (vattr_t));
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
return (error);
}
static int
Linux 3.3 compat, iops->create()/mkdir()/mknod() The mode argument of iops->create()/mkdir()/mknod() was changed from an 'int' to a 'umode_t'. To prevent a compiler warning an autoconf check was added to detect the API change and then correctly set a zpl_umode_t typedef. There is no functional change. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #701
2012-04-30 19:01:49 +00:00
zpl_mknod(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
dev_t rdev)
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
{
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
struct inode *ip;
vattr_t *vap;
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Don't store rdev in SA for FIFOs and sockets Update the handling of named pipes and sockets to be consistent with other platforms with regard to the rdev attribute. While all ZFS ipmlementations store the rdev for device files in a system attribute (SA), this is not the case for FIFOs and sockets. Indeed, Linux always passes rdev=0 to mknod() for FIFOs and sockets, so the value is not needed. Add an ASSERT that rdev==0 for FIFOs and sockets to detect if the expected behavior ever changes. Closes #216
2011-05-09 19:31:56 +00:00
/*
* We currently expect Linux to supply rdev=0 for all sockets
* and fifos, but we want to know if this behavior ever changes.
*/
if (S_ISSOCK(mode) || S_ISFIFO(mode))
ASSERT(rdev == 0);
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
zpl_vap_init(vap, dir, mode, cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
vap->va_rdev = rdev;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
if (error == 0) {
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
d_instantiate(dentry, ip);
Safely handle security / ACL failures The security and ACL operations should all be performed atomically. To accomplish this there would need to significant invasive changes made to the common code base. For the moment it's desirable for compatibility reasons to avoid this. Therefore the code has been updated to attempt to unwind the operation in case of failure rather than panic. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2445
2014-07-02 21:47:02 +00:00
error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
if (error == 0)
error = zpl_init_acl(ip, dir);
if (error)
(void) zfs_remove(dir, dname(dentry), cr);
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
}
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
Extend PF_FSTRANS critical regions Additional testing has shown that the region covered by PF_FSTRANS needs to be extended to cover the zpl_xattr_security_init() and init_acl() functions. The zpl_mark_dirty() function can also recurse and therefore must always be protected. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Closes #3331
2015-04-23 17:09:19 +00:00
spl_fstrans_unmark(cookie);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(vap, sizeof (vattr_t));
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
Fix zpl_mknod() return values The zpl_mknod() function was incorrectly negating its return value. This doesn't cause any problems in the success case, but it does prevent us from returning the correct error code for a failure. The implementation of this function is now consistent with all the other zpl_* functions. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1717
2013-09-13 20:20:15 +00:00
return (error);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
}
static int
zpl_unlink(struct inode *dir, struct dentry *dentry)
{
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
zfs_sb_t *zsb = dentry->d_sb->s_fs_info;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
error = -zfs_remove(dir, dname(dentry), cr);
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
/*
* For a CI FS we must invalidate the dentry to prevent the
* creation of negative entries.
*/
if (error == 0 && zsb->z_case == ZFS_CASE_INSENSITIVE)
d_invalidate(dentry);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
spl_fstrans_unmark(cookie);
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
return (error);
}
static int
Linux 3.3 compat, iops->create()/mkdir()/mknod() The mode argument of iops->create()/mkdir()/mknod() was changed from an 'int' to a 'umode_t'. To prevent a compiler warning an autoconf check was added to detect the API change and then correctly set a zpl_umode_t typedef. There is no functional change. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #701
2012-04-30 19:01:49 +00:00
zpl_mkdir(struct inode *dir, struct dentry *dentry, zpl_umode_t mode)
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
{
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
vattr_t *vap;
struct inode *ip;
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
zpl_vap_init(vap, dir, mode | S_IFDIR, cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
if (error == 0) {
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
d_instantiate(dentry, ip);
Safely handle security / ACL failures The security and ACL operations should all be performed atomically. To accomplish this there would need to significant invasive changes made to the common code base. For the moment it's desirable for compatibility reasons to avoid this. Therefore the code has been updated to attempt to unwind the operation in case of failure rather than panic. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2445
2014-07-02 21:47:02 +00:00
error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
if (error == 0)
error = zpl_init_acl(ip, dir);
if (error)
(void) zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
}
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
Extend PF_FSTRANS critical regions Additional testing has shown that the region covered by PF_FSTRANS needs to be extended to cover the zpl_xattr_security_init() and init_acl() functions. The zpl_mark_dirty() function can also recurse and therefore must always be protected. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Closes #3331
2015-04-23 17:09:19 +00:00
spl_fstrans_unmark(cookie);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(vap, sizeof (vattr_t));
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_rmdir(struct inode * dir, struct dentry *dentry)
{
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
zfs_sb_t *zsb = dentry->d_sb->s_fs_info;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
Handling negative dentries in a CI file system. For a Case Insensitive file system we must avoid creating negative entries in the dentry cache. We must also pass the FIGNORECASE into zfs_lookup so that special files are handled correctly. We must also prevent negative dentries from being created when files are unlinked. Tested by running fsstress from LTP (10 loops, 10 processes, 10,000 ops.) Also tested with printks (now removed) to ensure that lookups come to zpl_lookup when negative should not exist. Tests: 1. ls Some-file.txt; touch some-file.txt; ls Some-file.txt and ensure no errors. 2. touch Some-file.txt; rm some-file.txt; ls Some-file.txt and ensure that the last ls shows log messages showing the lookup went all the way to zpl_lookup. Thanks to tuxoko for helping me get this correct. Signed-off-by: Richard Sharpe <realrichardsharpe@gmail.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #4243
2016-01-24 19:36:51 +00:00
/*
* For a CI FS we must invalidate the dentry to prevent the
* creation of negative entries.
*/
if (error == 0 && zsb->z_case == ZFS_CASE_INSENSITIVE)
d_invalidate(dentry);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
spl_fstrans_unmark(cookie);
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Improve fstat(2) performance There is at most a factor of 3x performance improvement to be had by using the Linux generic_fillattr() helper. However, to use it safely we need to ensure the values in a cached inode are kept rigerously up to date. Unfortunately, this isn't the case for the blksize, blocks, and atime fields. At the moment the authoritative values are still stored in the znode. This patch introduces an optimized zfs_getattr_fast() call. The idea is to use the up to date values from the inode and the blksize, block, and atime fields from the znode. At some latter date we should be able to strictly use the inode values and further improve performance. The remaining overhead in the zfs_getattr_fast() call can be attributed to having to take the znode mutex. This overhead is unavoidable until the inode is kept strictly up to date. The the careful reader will notice the we do not use the customary ZFS_ENTER()/ZFS_EXIT() macros. These macro's are designed to ensure the filesystem is not torn down in the middle of an operation. However, in this case the VFS is holding a reference on the active inode so we know this is impossible. =================== Performance Tests ======================== This test calls the fstat(2) system call 10,000,000 times on an open file description in a tight loop. The test results show the zfs stat(2) performance is now only 22% slower than ext4. This is a 2.5x improvement and there is a clear long term plan to get to parity with ext4. filesystem | test-1 test-2 test-3 | average | times-ext4 --------------+-------------------------+---------+----------- ext4 | 7.785s 7.899s 7.284s | 7.656s | 1.000x zfs-0.6.0-rc4 | 24.052s 22.531s 23.857s | 23.480s | 3.066x zfs-faststat | 9.224s 9.398s 9.485s | 9.369s | 1.223x The second test is to run 'du' of a copy of the /usr tree which contains 110514 files. The test is run multiple times both using both a cold cache (/proc/sys/vm/drop_caches) and a hot cache. As expected this change signigicantly improved the zfs hot cache performance and doesn't quite bring zfs to parity with ext4. A little surprisingly the zfs cold cache performance is better than ext4. This can probably be attributed to the zfs allocation policy of co-locating all the meta data on disk which minimizes seek times. By default the ext4 allocator will spread the data over the entire disk only co-locating each directory. filesystem | cold | hot --------------+---------+-------- ext4 | 13.318s | 1.040s zfs-0.6.0-rc4 | 4.982s | 1.762s zfs-faststat | 4.933s | 1.345s
2011-07-09 22:44:16 +00:00
error = -zfs_getattr_fast(dentry->d_inode, stat);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
spl_fstrans_unmark(cookie);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
return (error);
}
static int
Drop HAVE_XVATTR macros When I began work on the Posix layer it immediately became clear to me that to integrate cleanly with the Linux VFS certain Solaris specific things would have to go. One of these things was to elimate as many Solaris specific types from the ZPL layer as possible. They would be replaced with their Linux equivalents. This would not only be good for performance, but for the general readability and health of the code. The Solaris and Linux VFS are different beasts and should be treated as such. Most of the code remains common for constructing transactions and such, but there are subtle and important differenced which need to be repsected. This policy went quite for for certain types such as the vnode_t, and it initially seemed to be working out well for the vattr_t. There was a relatively small amount of related xvattr_t code I was forced to comment out with HAVE_XVATTR. But it didn't look that hard to come back soon and replace it all with a native Linux type. However, after going doing this path with xvattr some distance it clear that this code was woven in the ZPL more deeply than I thought. In particular its hooks went very deep in to the ZPL replay code and replacing it would not be as easy as I originally thought. Rather than continue persuing replacing and removing this code I've taken a step back and reevaluted things. This commit reverts many of my previous commits which removed xvattr related code. It restores much of the code to its original upstream state and now relies on improved xvattr_t support in the zfs package itself. The result of this is that much of the code which I had commented out, which accidentally broke things like replay, is now back in place and working. However, there may be a small performance impact for getattr/setattr operations because they now require a translation from native Linux to Solaris types. For now that's a price I'm willing to pay. Once everything is completely functional we can revisting the issue of removing the vattr_t/xvattr_t types. Closes #111
2011-03-01 20:24:09 +00:00
zpl_setattr(struct dentry *dentry, struct iattr *ia)
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
{
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
struct inode *ip = dentry->d_inode;
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Drop HAVE_XVATTR macros When I began work on the Posix layer it immediately became clear to me that to integrate cleanly with the Linux VFS certain Solaris specific things would have to go. One of these things was to elimate as many Solaris specific types from the ZPL layer as possible. They would be replaced with their Linux equivalents. This would not only be good for performance, but for the general readability and health of the code. The Solaris and Linux VFS are different beasts and should be treated as such. Most of the code remains common for constructing transactions and such, but there are subtle and important differenced which need to be repsected. This policy went quite for for certain types such as the vnode_t, and it initially seemed to be working out well for the vattr_t. There was a relatively small amount of related xvattr_t code I was forced to comment out with HAVE_XVATTR. But it didn't look that hard to come back soon and replace it all with a native Linux type. However, after going doing this path with xvattr some distance it clear that this code was woven in the ZPL more deeply than I thought. In particular its hooks went very deep in to the ZPL replay code and replacing it would not be as easy as I originally thought. Rather than continue persuing replacing and removing this code I've taken a step back and reevaluted things. This commit reverts many of my previous commits which removed xvattr related code. It restores much of the code to its original upstream state and now relies on improved xvattr_t support in the zfs package itself. The result of this is that much of the code which I had commented out, which accidentally broke things like replay, is now back in place and working. However, there may be a small performance impact for getattr/setattr operations because they now require a translation from native Linux to Solaris types. For now that's a price I'm willing to pay. Once everything is completely functional we can revisting the issue of removing the vattr_t/xvattr_t types. Closes #111
2011-03-01 20:24:09 +00:00
vattr_t *vap;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
error = inode_change_ok(ip, ia);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
if (error)
return (error);
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
Drop HAVE_XVATTR macros When I began work on the Posix layer it immediately became clear to me that to integrate cleanly with the Linux VFS certain Solaris specific things would have to go. One of these things was to elimate as many Solaris specific types from the ZPL layer as possible. They would be replaced with their Linux equivalents. This would not only be good for performance, but for the general readability and health of the code. The Solaris and Linux VFS are different beasts and should be treated as such. Most of the code remains common for constructing transactions and such, but there are subtle and important differenced which need to be repsected. This policy went quite for for certain types such as the vnode_t, and it initially seemed to be working out well for the vattr_t. There was a relatively small amount of related xvattr_t code I was forced to comment out with HAVE_XVATTR. But it didn't look that hard to come back soon and replace it all with a native Linux type. However, after going doing this path with xvattr some distance it clear that this code was woven in the ZPL more deeply than I thought. In particular its hooks went very deep in to the ZPL replay code and replacing it would not be as easy as I originally thought. Rather than continue persuing replacing and removing this code I've taken a step back and reevaluted things. This commit reverts many of my previous commits which removed xvattr related code. It restores much of the code to its original upstream state and now relies on improved xvattr_t support in the zfs package itself. The result of this is that much of the code which I had commented out, which accidentally broke things like replay, is now back in place and working. However, there may be a small performance impact for getattr/setattr operations because they now require a translation from native Linux to Solaris types. For now that's a price I'm willing to pay. Once everything is completely functional we can revisting the issue of removing the vattr_t/xvattr_t types. Closes #111
2011-03-01 20:24:09 +00:00
vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
vap->va_mode = ia->ia_mode;
Linux 3.8 compat: Support CONFIG_UIDGID_STRICT_TYPE_CHECKS When CONFIG_UIDGID_STRICT_TYPE_CHECKS is enabled uid_t/git_t are replaced by kuid_t/kgid_t, which are structures instead of integral types. This causes any code that uses an integral type to fail to build. The User Namespace functionality introduced in Linux 3.8 requires CONFIG_UIDGID_STRICT_TYPE_CHECKS, so we could not build against any kernel that supported it. We resolve this by converting between the new kuid_t/kgid_t structures and the original uid_t/gid_t types. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1589
2013-07-14 16:59:24 +00:00
vap->va_uid = KUID_TO_SUID(ia->ia_uid);
vap->va_gid = KGID_TO_SGID(ia->ia_gid);
Drop HAVE_XVATTR macros When I began work on the Posix layer it immediately became clear to me that to integrate cleanly with the Linux VFS certain Solaris specific things would have to go. One of these things was to elimate as many Solaris specific types from the ZPL layer as possible. They would be replaced with their Linux equivalents. This would not only be good for performance, but for the general readability and health of the code. The Solaris and Linux VFS are different beasts and should be treated as such. Most of the code remains common for constructing transactions and such, but there are subtle and important differenced which need to be repsected. This policy went quite for for certain types such as the vnode_t, and it initially seemed to be working out well for the vattr_t. There was a relatively small amount of related xvattr_t code I was forced to comment out with HAVE_XVATTR. But it didn't look that hard to come back soon and replace it all with a native Linux type. However, after going doing this path with xvattr some distance it clear that this code was woven in the ZPL more deeply than I thought. In particular its hooks went very deep in to the ZPL replay code and replacing it would not be as easy as I originally thought. Rather than continue persuing replacing and removing this code I've taken a step back and reevaluted things. This commit reverts many of my previous commits which removed xvattr related code. It restores much of the code to its original upstream state and now relies on improved xvattr_t support in the zfs package itself. The result of this is that much of the code which I had commented out, which accidentally broke things like replay, is now back in place and working. However, there may be a small performance impact for getattr/setattr operations because they now require a translation from native Linux to Solaris types. For now that's a price I'm willing to pay. Once everything is completely functional we can revisting the issue of removing the vattr_t/xvattr_t types. Closes #111
2011-03-01 20:24:09 +00:00
vap->va_size = ia->ia_size;
vap->va_atime = ia->ia_atime;
vap->va_mtime = ia->ia_mtime;
vap->va_ctime = ia->ia_ctime;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
error = -zfs_setattr(ip, vap, 0, cr);
if (!error && (ia->ia_valid & ATTR_MODE))
error = zpl_chmod_acl(ip);
Drop HAVE_XVATTR macros When I began work on the Posix layer it immediately became clear to me that to integrate cleanly with the Linux VFS certain Solaris specific things would have to go. One of these things was to elimate as many Solaris specific types from the ZPL layer as possible. They would be replaced with their Linux equivalents. This would not only be good for performance, but for the general readability and health of the code. The Solaris and Linux VFS are different beasts and should be treated as such. Most of the code remains common for constructing transactions and such, but there are subtle and important differenced which need to be repsected. This policy went quite for for certain types such as the vnode_t, and it initially seemed to be working out well for the vattr_t. There was a relatively small amount of related xvattr_t code I was forced to comment out with HAVE_XVATTR. But it didn't look that hard to come back soon and replace it all with a native Linux type. However, after going doing this path with xvattr some distance it clear that this code was woven in the ZPL more deeply than I thought. In particular its hooks went very deep in to the ZPL replay code and replacing it would not be as easy as I originally thought. Rather than continue persuing replacing and removing this code I've taken a step back and reevaluted things. This commit reverts many of my previous commits which removed xvattr related code. It restores much of the code to its original upstream state and now relies on improved xvattr_t support in the zfs package itself. The result of this is that much of the code which I had commented out, which accidentally broke things like replay, is now back in place and working. However, there may be a small performance impact for getattr/setattr operations because they now require a translation from native Linux to Solaris types. For now that's a price I'm willing to pay. Once everything is completely functional we can revisting the issue of removing the vattr_t/xvattr_t types. Closes #111
2011-03-01 20:24:09 +00:00
Extend PF_FSTRANS critical regions Additional testing has shown that the region covered by PF_FSTRANS needs to be extended to cover the zpl_xattr_security_init() and init_acl() functions. The zpl_mark_dirty() function can also recurse and therefore must always be protected. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Closes #3331
2015-04-23 17:09:19 +00:00
spl_fstrans_unmark(cookie);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(vap, sizeof (vattr_t));
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
Drop HAVE_XVATTR macros When I began work on the Posix layer it immediately became clear to me that to integrate cleanly with the Linux VFS certain Solaris specific things would have to go. One of these things was to elimate as many Solaris specific types from the ZPL layer as possible. They would be replaced with their Linux equivalents. This would not only be good for performance, but for the general readability and health of the code. The Solaris and Linux VFS are different beasts and should be treated as such. Most of the code remains common for constructing transactions and such, but there are subtle and important differenced which need to be repsected. This policy went quite for for certain types such as the vnode_t, and it initially seemed to be working out well for the vattr_t. There was a relatively small amount of related xvattr_t code I was forced to comment out with HAVE_XVATTR. But it didn't look that hard to come back soon and replace it all with a native Linux type. However, after going doing this path with xvattr some distance it clear that this code was woven in the ZPL more deeply than I thought. In particular its hooks went very deep in to the ZPL replay code and replacing it would not be as easy as I originally thought. Rather than continue persuing replacing and removing this code I've taken a step back and reevaluted things. This commit reverts many of my previous commits which removed xvattr related code. It restores much of the code to its original upstream state and now relies on improved xvattr_t support in the zfs package itself. The result of this is that much of the code which I had commented out, which accidentally broke things like replay, is now back in place and working. However, there may be a small performance impact for getattr/setattr operations because they now require a translation from native Linux to Solaris types. For now that's a price I'm willing to pay. Once everything is completely functional we can revisting the issue of removing the vattr_t/xvattr_t types. Closes #111
2011-03-01 20:24:09 +00:00
return (error);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
}
static int
zpl_rename(struct inode *sdip, struct dentry *sdentry,
struct inode *tdip, struct dentry *tdentry)
{
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
spl_fstrans_unmark(cookie);
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name)
{
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
vattr_t *vap;
struct inode *ip;
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
zpl_vap_init(vap, dir, S_IFLNK | S_IRWXUGO, cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
Fixes (extends) support for selinux xattrs to more inode types Properly initialize SELinux xattrs for all inode types. The initial implementation accidentally only did this for files. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1832
2013-11-06 21:54:54 +00:00
if (error == 0) {
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
d_instantiate(dentry, ip);
Safely handle security / ACL failures The security and ACL operations should all be performed atomically. To accomplish this there would need to significant invasive changes made to the common code base. For the moment it's desirable for compatibility reasons to avoid this. Therefore the code has been updated to attempt to unwind the operation in case of failure rather than panic. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #2445
2014-07-02 21:47:02 +00:00
error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
if (error)
(void) zfs_remove(dir, dname(dentry), cr);
Fixes (extends) support for selinux xattrs to more inode types Properly initialize SELinux xattrs for all inode types. The initial implementation accidentally only did this for files. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1832
2013-11-06 21:54:54 +00:00
}
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
Extend PF_FSTRANS critical regions Additional testing has shown that the region covered by PF_FSTRANS needs to be extended to cover the zpl_xattr_security_init() and init_acl() functions. The zpl_mark_dirty() function can also recurse and therefore must always be protected. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Closes #3331
2015-04-23 17:09:19 +00:00
spl_fstrans_unmark(cookie);
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
kmem_free(vap, sizeof (vattr_t));
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
return (error);
}
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
#if defined(HAVE_PUT_LINK_COOKIE)
static void
zpl_put_link(struct inode *unused, void *cookie)
{
kmem_free(cookie, MAXPATHLEN);
}
#elif defined(HAVE_PUT_LINK_NAMEIDATA)
static void
zpl_put_link(struct dentry *dentry, struct nameidata *nd, void *ptr)
{
const char *link = nd_get_link(nd);
if (!IS_ERR(link))
kmem_free(link, MAXPATHLEN);
}
#elif defined(HAVE_PUT_LINK_DELAYED)
static void
zpl_put_link(void *ptr)
{
kmem_free(ptr, MAXPATHLEN);
}
Linux 4.2 compat: follow_link() / put_link() As of Linux 4.2 the kernel has completely retired the nameidata structure. One of the few remaining consumers of this interface were the follow_link() and put_link() callbacks. This patch adds the required checks to configure to detect the interface change and updates the functions accordingly. Migrating to the simple_follow_link() interface was considered but was decided against ironically due to the increased complexity. It also should be noted that the kernel follow_link() and put_link() interfaces changes several times after 4.1 and but before 4.2. This means there is a narrow range of kernel commits which never appear in an official tag of the Linux kernel which ZoL will not build. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3596
2015-07-15 17:54:26 +00:00
#endif
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
static int
zpl_get_link_common(struct dentry *dentry, struct inode *ip, char **link)
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
{
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
fstrans_cookie_t cookie;
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Fix readlink(2) This patch addresses three issues related to symlinks. 1) Revert the zfs_follow_link() function to a modified version of the original zfs_readlink(). The only changes from the original OpenSolaris version relate to using Linux types. For the moment this means no vnode's and no zfsvfs_t. The caller zpl_follow_link() was also updated accordingly. This change was reverted because it was slightly gratuitious. 2) Update zpl_follow_link() to use local variables for the link buffer. I'd forgotten that iov.iov_base is updated by uiomove() so after the call to zfs_readlink() it can not longer be used. We need our own private copy of the link pointer. 3) Allocate MAXPATHLEN instead of MAXPATHLEN+1. By default MAXPATHLEN is 4096 bytes which is a full page, adding one to it pushes it slightly over a page. That means you'll likely end up allocating 2 pages which is wasteful of memory and possibly slightly slower.
2011-02-16 23:54:55 +00:00
struct iovec iov;
uio_t uio;
int error;
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
*link = NULL;
Fix readlink(2) This patch addresses three issues related to symlinks. 1) Revert the zfs_follow_link() function to a modified version of the original zfs_readlink(). The only changes from the original OpenSolaris version relate to using Linux types. For the moment this means no vnode's and no zfsvfs_t. The caller zpl_follow_link() was also updated accordingly. This change was reverted because it was slightly gratuitious. 2) Update zpl_follow_link() to use local variables for the link buffer. I'd forgotten that iov.iov_base is updated by uiomove() so after the call to zfs_readlink() it can not longer be used. We need our own private copy of the link pointer. 3) Allocate MAXPATHLEN instead of MAXPATHLEN+1. By default MAXPATHLEN is 4096 bytes which is a full page, adding one to it pushes it slightly over a page. That means you'll likely end up allocating 2 pages which is wasteful of memory and possibly slightly slower.
2011-02-16 23:54:55 +00:00
iov.iov_len = MAXPATHLEN;
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
iov.iov_base = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
Fix readlink(2) This patch addresses three issues related to symlinks. 1) Revert the zfs_follow_link() function to a modified version of the original zfs_readlink(). The only changes from the original OpenSolaris version relate to using Linux types. For the moment this means no vnode's and no zfsvfs_t. The caller zpl_follow_link() was also updated accordingly. This change was reverted because it was slightly gratuitious. 2) Update zpl_follow_link() to use local variables for the link buffer. I'd forgotten that iov.iov_base is updated by uiomove() so after the call to zfs_readlink() it can not longer be used. We need our own private copy of the link pointer. 3) Allocate MAXPATHLEN instead of MAXPATHLEN+1. By default MAXPATHLEN is 4096 bytes which is a full page, adding one to it pushes it slightly over a page. That means you'll likely end up allocating 2 pages which is wasteful of memory and possibly slightly slower.
2011-02-16 23:54:55 +00:00
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
Linux 4.1 compat: loop device on ZFS Starting from Linux 4.1 allows iov_iter with bio_vec to be passed into iter_read/iter_write. Notably, the loop device will pass bio_vec to backend filesystem. However, current ZFS code assumes iovec without any check, so it will always crash when using loop device. With the restructured uio_t, we can safely pass bio_vec in uio_t with UIO_BVEC set. The uio* functions are modified to handle bio_vec case separately. The const uio_iov causes some warning in xuio related stuff, so explicit convert them to non const. Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3511 Closes #3640
2015-07-30 14:24:36 +00:00
uio.uio_skip = 0;
Fix readlink(2) This patch addresses three issues related to symlinks. 1) Revert the zfs_follow_link() function to a modified version of the original zfs_readlink(). The only changes from the original OpenSolaris version relate to using Linux types. For the moment this means no vnode's and no zfsvfs_t. The caller zpl_follow_link() was also updated accordingly. This change was reverted because it was slightly gratuitious. 2) Update zpl_follow_link() to use local variables for the link buffer. I'd forgotten that iov.iov_base is updated by uiomove() so after the call to zfs_readlink() it can not longer be used. We need our own private copy of the link pointer. 3) Allocate MAXPATHLEN instead of MAXPATHLEN+1. By default MAXPATHLEN is 4096 bytes which is a full page, adding one to it pushes it slightly over a page. That means you'll likely end up allocating 2 pages which is wasteful of memory and possibly slightly slower.
2011-02-16 23:54:55 +00:00
uio.uio_resid = (MAXPATHLEN - 1);
uio.uio_segflg = UIO_SYSSPACE;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Use -zfs_readlink() error The zfs_readlink() function returns a Solaris positive error value and that needs to be converted to a Linux negative error value. While in this case nothing would actually go wrong, it's still incorrect and should be fixed if for no other reason than clarity.
2011-02-17 17:48:06 +00:00
error = -zfs_readlink(ip, &uio, cr);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
spl_fstrans_unmark(cookie);
Linux 4.2 compat: follow_link() / put_link() As of Linux 4.2 the kernel has completely retired the nameidata structure. One of the few remaining consumers of this interface were the follow_link() and put_link() callbacks. This patch adds the required checks to configure to detect the interface change and updates the functions accordingly. Migrating to the simple_follow_link() interface was considered but was decided against ironically due to the increased complexity. It also should be noted that the kernel follow_link() and put_link() interfaces changes several times after 4.1 and but before 4.2. This means there is a narrow range of kernel commits which never appear in an official tag of the Linux kernel which ZoL will not build. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3596
2015-07-15 17:54:26 +00:00
crfree(cr);
if (error)
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
kmem_free(iov.iov_base, MAXPATHLEN);
Linux 4.2 compat: follow_link() / put_link() As of Linux 4.2 the kernel has completely retired the nameidata structure. One of the few remaining consumers of this interface were the follow_link() and put_link() callbacks. This patch adds the required checks to configure to detect the interface change and updates the functions accordingly. Migrating to the simple_follow_link() interface was considered but was decided against ironically due to the increased complexity. It also should be noted that the kernel follow_link() and put_link() interfaces changes several times after 4.1 and but before 4.2. This means there is a narrow range of kernel commits which never appear in an official tag of the Linux kernel which ZoL will not build. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3596
2015-07-15 17:54:26 +00:00
else
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
*link = iov.iov_base;
Fix readlink(2) This patch addresses three issues related to symlinks. 1) Revert the zfs_follow_link() function to a modified version of the original zfs_readlink(). The only changes from the original OpenSolaris version relate to using Linux types. For the moment this means no vnode's and no zfsvfs_t. The caller zpl_follow_link() was also updated accordingly. This change was reverted because it was slightly gratuitious. 2) Update zpl_follow_link() to use local variables for the link buffer. I'd forgotten that iov.iov_base is updated by uiomove() so after the call to zfs_readlink() it can not longer be used. We need our own private copy of the link pointer. 3) Allocate MAXPATHLEN instead of MAXPATHLEN+1. By default MAXPATHLEN is 4096 bytes which is a full page, adding one to it pushes it slightly over a page. That means you'll likely end up allocating 2 pages which is wasteful of memory and possibly slightly slower.
2011-02-16 23:54:55 +00:00
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
return (error);
}
#if defined(HAVE_GET_LINK_DELAYED)
const char *
zpl_get_link(struct dentry *dentry, struct inode *inode,
struct delayed_call *done)
{
char *link = NULL;
int error;
if (!dentry)
return (ERR_PTR(-ECHILD));
error = zpl_get_link_common(dentry, inode, &link);
Linux 4.2 compat: follow_link() / put_link() As of Linux 4.2 the kernel has completely retired the nameidata structure. One of the few remaining consumers of this interface were the follow_link() and put_link() callbacks. This patch adds the required checks to configure to detect the interface change and updates the functions accordingly. Migrating to the simple_follow_link() interface was considered but was decided against ironically due to the increased complexity. It also should be noted that the kernel follow_link() and put_link() interfaces changes several times after 4.1 and but before 4.2. This means there is a narrow range of kernel commits which never appear in an official tag of the Linux kernel which ZoL will not build. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3596
2015-07-15 17:54:26 +00:00
if (error)
return (ERR_PTR(error));
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
set_delayed_call(done, zpl_put_link, link);
return (link);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
}
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
#elif defined(HAVE_GET_LINK_COOKIE)
const char *
zpl_get_link(struct dentry *dentry, struct inode *inode, void **cookie)
{
char *link = NULL;
int error;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
if (!dentry)
return (ERR_PTR(-ECHILD));
error = zpl_get_link_common(dentry, inode, &link);
if (error)
return (ERR_PTR(error));
return (*cookie = link);
}
#elif defined(HAVE_FOLLOW_LINK_COOKIE)
const char *
zpl_follow_link(struct dentry *dentry, void **cookie)
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
{
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
char *link = NULL;
int error;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
error = zpl_get_link_common(dentry, dentry->d_inode, &link);
if (error)
return (ERR_PTR(error));
return (*cookie = link);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
}
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
#elif defined(HAVE_FOLLOW_LINK_NAMEIDATA)
static void *
zpl_follow_link(struct dentry *dentry, struct nameidata *nd)
Linux 4.2 compat: follow_link() / put_link() As of Linux 4.2 the kernel has completely retired the nameidata structure. One of the few remaining consumers of this interface were the follow_link() and put_link() callbacks. This patch adds the required checks to configure to detect the interface change and updates the functions accordingly. Migrating to the simple_follow_link() interface was considered but was decided against ironically due to the increased complexity. It also should be noted that the kernel follow_link() and put_link() interfaces changes several times after 4.1 and but before 4.2. This means there is a narrow range of kernel commits which never appear in an official tag of the Linux kernel which ZoL will not build. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3596
2015-07-15 17:54:26 +00:00
{
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
char *link = NULL;
int error;
error = zpl_get_link_common(dentry, dentry->d_inode, &link);
if (error)
nd_set_link(nd, ERR_PTR(error));
else
nd_set_link(nd, link);
return (NULL);
Linux 4.2 compat: follow_link() / put_link() As of Linux 4.2 the kernel has completely retired the nameidata structure. One of the few remaining consumers of this interface were the follow_link() and put_link() callbacks. This patch adds the required checks to configure to detect the interface change and updates the functions accordingly. Migrating to the simple_follow_link() interface was considered but was decided against ironically due to the increased complexity. It also should be noted that the kernel follow_link() and put_link() interfaces changes several times after 4.1 and but before 4.2. This means there is a narrow range of kernel commits which never appear in an official tag of the Linux kernel which ZoL will not build. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3596
2015-07-15 17:54:26 +00:00
}
#endif
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
static int
zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
cred_t *cr = CRED();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
struct inode *ip = old_dentry->d_inode;
int error;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
if (ip->i_nlink >= ZFS_LINK_MAX)
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
return (-EMLINK);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crhold(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ip->i_ctime = CURRENT_TIME_SEC;
igrab(ip); /* Use ihold() if available */
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
error = -zfs_link(dir, ip, dname(dentry), cr);
if (error) {
iput(ip);
goto out;
}
d_instantiate(dentry, ip);
out:
Extend PF_FSTRANS critical regions Additional testing has shown that the region covered by PF_FSTRANS needs to be extended to cover the zpl_xattr_security_init() and init_acl() functions. The zpl_mark_dirty() function can also recurse and therefore must always be protected. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Signed-off-by: Richard Yao <ryao@gentoo.org> Closes #3331
2015-04-23 17:09:19 +00:00
spl_fstrans_unmark(cookie);
Linux 2.6.29 compat, credentials As of Linux 2.6.29 a clean credential API was added to the Linux kernel. Previously the credential was embedded in the task_struct. Because the SPL already has considerable support for handling this API change the ZPL code has been updated to use the Solaris credential API.
2011-03-22 18:13:41 +00:00
crfree(cr);
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
ASSERT3S(error, <=, 0);
return (error);
}
Linux 3.5 compat, iops->truncate_range() removed The vmtruncate_range() support has been removed from the kernel in favor of using the fallocate method in the file_operations table. Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #784
2012-07-23 18:11:25 +00:00
#ifdef HAVE_INODE_TRUNCATE_RANGE
Implement the truncate_range() inode operation. This operation allows "hole punching" in ZFS files. On Solaris this is done via the vop_space() system call, which maps to the zfs_space() function. So we just need to write zpl_truncate_range() as a wrapper around zfs_space(). Note that this only works for regular files, not ZVOLs. This is currently an insecure implementation without permission checking, although this isn't that big of a deal since truncate_range() isn't even callable from userspace. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-01 11:59:41 +00:00
static void
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
zpl_truncate_range(struct inode *ip, loff_t start, loff_t end)
Implement the truncate_range() inode operation. This operation allows "hole punching" in ZFS files. On Solaris this is done via the vop_space() system call, which maps to the zfs_space() function. So we just need to write zpl_truncate_range() as a wrapper around zfs_space(). Note that this only works for regular files, not ZVOLs. This is currently an insecure implementation without permission checking, although this isn't that big of a deal since truncate_range() isn't even callable from userspace. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-01 11:59:41 +00:00
{
cred_t *cr = CRED();
flock64_t bf;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
fstrans_cookie_t cookie;
Implement the truncate_range() inode operation. This operation allows "hole punching" in ZFS files. On Solaris this is done via the vop_space() system call, which maps to the zfs_space() function. So we just need to write zpl_truncate_range() as a wrapper around zfs_space(). Note that this only works for regular files, not ZVOLs. This is currently an insecure implementation without permission checking, although this isn't that big of a deal since truncate_range() isn't even callable from userspace. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-01 11:59:41 +00:00
ASSERT3S(start, <=, end);
/*
* zfs_freesp() will interpret (len == 0) as meaning "truncate until
* the end of the file". We don't want that.
*/
if (start == end)
return;
crhold(cr);
bf.l_type = F_WRLCK;
bf.l_whence = 0;
bf.l_start = start;
bf.l_len = end - start;
bf.l_pid = 0;
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
cookie = spl_fstrans_mark();
Implement the truncate_range() inode operation. This operation allows "hole punching" in ZFS files. On Solaris this is done via the vop_space() system call, which maps to the zfs_space() function. So we just need to write zpl_truncate_range() as a wrapper around zfs_space(). Note that this only works for regular files, not ZVOLs. This is currently an insecure implementation without permission checking, although this isn't that big of a deal since truncate_range() isn't even callable from userspace. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-01 11:59:41 +00:00
zfs_space(ip, F_FREESP, &bf, FWRITE, start, cr);
Mark all ZPL and ioctl functions as PF_FSTRANS Prevent deadlocks by disabling direct reclaim during all ZPL and ioctl calls as well as the l2arc and adapt ARC threads. This obviates the need for MUTEX_FSTRANS so its previous uses and definition have been eliminated. Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3225
2015-03-31 03:43:29 +00:00
spl_fstrans_unmark(cookie);
Implement the truncate_range() inode operation. This operation allows "hole punching" in ZFS files. On Solaris this is done via the vop_space() system call, which maps to the zfs_space() function. So we just need to write zpl_truncate_range() as a wrapper around zfs_space(). Note that this only works for regular files, not ZVOLs. This is currently an insecure implementation without permission checking, although this isn't that big of a deal since truncate_range() isn't even callable from userspace. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-01 11:59:41 +00:00
crfree(cr);
}
Linux 3.5 compat, iops->truncate_range() removed The vmtruncate_range() support has been removed from the kernel in favor of using the fallocate method in the file_operations table. Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #784
2012-07-23 18:11:25 +00:00
#endif /* HAVE_INODE_TRUNCATE_RANGE */
Implement the truncate_range() inode operation. This operation allows "hole punching" in ZFS files. On Solaris this is done via the vop_space() system call, which maps to the zfs_space() function. So we just need to write zpl_truncate_range() as a wrapper around zfs_space(). Note that this only works for regular files, not ZVOLs. This is currently an insecure implementation without permission checking, although this isn't that big of a deal since truncate_range() isn't even callable from userspace. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-01 11:59:41 +00:00
Support the fallocate() file operation. Currently only the (FALLOC_FL_PUNCH_HOLE) flag combination is supported, since it's the only one that matches the behavior of zfs_space(). This makes it pretty much useless in its current form, but it's a start. To support other flag combinations we would need to modify zfs_space() to make it more flexible, or emulate the desired functionality in zpl_fallocate(). Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-02 07:42:07 +00:00
#ifdef HAVE_INODE_FALLOCATE
static long
zpl_fallocate(struct inode *ip, int mode, loff_t offset, loff_t len)
{
cstyle: Resolve C style issues The vast majority of these changes are in Linux specific code. They are the result of not having an automated style checker to validate the code when it was originally written. Others were caused when the common code was slightly adjusted for Linux. This patch contains no functional changes. It only refreshes the code to conform to style guide. Everyone submitting patches for inclusion upstream should now run 'make checkstyle' and resolve any warning prior to opening a pull request. The automated builders have been updated to fail a build if when 'make checkstyle' detects an issue. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1821
2013-11-01 19:26:11 +00:00
return (zpl_fallocate_common(ip, mode, offset, len));
Support the fallocate() file operation. Currently only the (FALLOC_FL_PUNCH_HOLE) flag combination is supported, since it's the only one that matches the behavior of zfs_space(). This makes it pretty much useless in its current form, but it's a start. To support other flag combinations we would need to modify zfs_space() to make it more flexible, or emulate the desired functionality in zpl_fallocate(). Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-02 07:42:07 +00:00
}
#endif /* HAVE_INODE_FALLOCATE */
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
static int
#ifdef HAVE_D_REVALIDATE_NAMEIDATA
zpl_revalidate(struct dentry *dentry, struct nameidata *nd)
{
Fix zpl_revalidate() NULL deref In zpl_revalidate() it's possible for the nameidata to be NULL for kernels which still accept the parameter. In particular, lookup_one_len() calls d_revalidate() with a NULL nameidata. Resolve the issue by checking for a NULL nameidata in which case just set the flags to 0. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1226
2013-01-22 17:05:49 +00:00
unsigned int flags = (nd ? nd->flags : 0);
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
#else
zpl_revalidate(struct dentry *dentry, unsigned int flags)
{
#endif /* HAVE_D_REVALIDATE_NAMEIDATA */
zfs_sb_t *zsb = dentry->d_sb->s_fs_info;
int error;
if (flags & LOOKUP_RCU)
return (-ECHILD);
Linux 3.18 compat: Snapshot auto-mounting Re-factor the .zfs/snapshot auto-mouting code to take in to account changes made to the upstream kernels. And to lay the groundwork for enabling access to .zfs snapshots via NFS clients. This patch makes the following core improvements. * All actively auto-mounted snapshots are now tracked in two global trees which are indexed by snapshot name and objset id respectively. This allows for fast lookups of any auto-mounted snapshot regardless without needing access to the parent dataset. * Snapshot entries are added to the tree in zfsctl_snapshot_mount(). However, they are now removed from the tree in the context of the unmount process. This eliminates the need complicated error logic in zfsctl_snapshot_unmount() to handle unmount failures. * References are now taken on the snapshot entries in the tree to ensure they always remain valid while a task is outstanding. * The MNT_SHRINKABLE flag is set on the snapshot vfsmount_t right after the auto-mount succeeds. This allows to kernel to unmount idle auto-mounted snapshots if needed removing the need for the zfsctl_unmount_snapshots() function. * Snapshots in active use will not be automatically unmounted. As long as at least one dentry is revalidated every zfs_expire_snapshot/2 seconds the auto-unmount expiration timer will be extended. * Commit torvalds/linux@bafc9b7 caused snapshots auto-mounted by ZFS to be immediately unmounted when the dentry was revalidated. This was a consequence of ZFS invaliding all snapdir dentries to ensure that negative dentries didn't mask new snapshots. This patch modifies the behavior such that only negative dentries are invalidated. This solves the issue and may result in a performance improvement. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3589 Closes #3344 Closes #3295 Closes #3257 Closes #3243 Closes #3030 Closes #2841
2015-04-24 23:21:13 +00:00
/*
* Automounted snapshots rely on periodic dentry revalidation
* to defer snapshots from being automatically unmounted.
*/
if (zsb->z_issnap) {
if (time_after(jiffies, zsb->z_snap_defer_time +
MAX(zfs_expire_snapshot * HZ / 2, HZ))) {
zsb->z_snap_defer_time = jiffies;
Use spa as key besides objsetid for snapentry objsetid is not unique across pool, so using it solely as key would cause panic when automounting two snapshot on different pools with the same objsetid. We fix this by adding spa pointer as additional key. Signed-off-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Richard Yao <ryao@gentoo.org> Issue #3948 Issue #3786 Issue #3887
2015-12-07 23:43:53 +00:00
zfsctl_snapshot_unmount_delay(zsb->z_os->os_spa,
Linux 3.18 compat: Snapshot auto-mounting Re-factor the .zfs/snapshot auto-mouting code to take in to account changes made to the upstream kernels. And to lay the groundwork for enabling access to .zfs snapshots via NFS clients. This patch makes the following core improvements. * All actively auto-mounted snapshots are now tracked in two global trees which are indexed by snapshot name and objset id respectively. This allows for fast lookups of any auto-mounted snapshot regardless without needing access to the parent dataset. * Snapshot entries are added to the tree in zfsctl_snapshot_mount(). However, they are now removed from the tree in the context of the unmount process. This eliminates the need complicated error logic in zfsctl_snapshot_unmount() to handle unmount failures. * References are now taken on the snapshot entries in the tree to ensure they always remain valid while a task is outstanding. * The MNT_SHRINKABLE flag is set on the snapshot vfsmount_t right after the auto-mount succeeds. This allows to kernel to unmount idle auto-mounted snapshots if needed removing the need for the zfsctl_unmount_snapshots() function. * Snapshots in active use will not be automatically unmounted. As long as at least one dentry is revalidated every zfs_expire_snapshot/2 seconds the auto-unmount expiration timer will be extended. * Commit torvalds/linux@bafc9b7 caused snapshots auto-mounted by ZFS to be immediately unmounted when the dentry was revalidated. This was a consequence of ZFS invaliding all snapdir dentries to ensure that negative dentries didn't mask new snapshots. This patch modifies the behavior such that only negative dentries are invalidated. This solves the issue and may result in a performance improvement. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #3589 Closes #3344 Closes #3295 Closes #3257 Closes #3243 Closes #3030 Closes #2841
2015-04-24 23:21:13 +00:00
dmu_objset_id(zsb->z_os), zfs_expire_snapshot);
}
}
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
/*
* After a rollback negative dentries created before the rollback
* time must be invalidated. Otherwise they can obscure files which
* are only present in the rolled back dataset.
*/
if (dentry->d_inode == NULL) {
spin_lock(&dentry->d_lock);
error = time_before(dentry->d_time, zsb->z_rollback_time);
spin_unlock(&dentry->d_lock);
if (error)
return (0);
}
/*
* The dentry may reference a stale inode if a mounted file system
* was rolled back to a point in time where the object didn't exist.
*/
if (dentry->d_inode && ITOZ(dentry->d_inode)->z_is_stale)
return (0);
return (1);
}
Support the fallocate() file operation. Currently only the (FALLOC_FL_PUNCH_HOLE) flag combination is supported, since it's the only one that matches the behavior of zfs_space(). This makes it pretty much useless in its current form, but it's a start. To support other flag combinations we would need to modify zfs_space() to make it more flexible, or emulate the desired functionality in zpl_fallocate(). Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-02 07:42:07 +00:00
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
const struct inode_operations zpl_inode_operations = {
.create = zpl_create,
.link = zpl_link,
.unlink = zpl_unlink,
.symlink = zpl_symlink,
.mkdir = zpl_mkdir,
.rmdir = zpl_rmdir,
.mknod = zpl_mknod,
.rename = zpl_rename,
.setattr = zpl_setattr,
.getattr = zpl_getattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = zpl_xattr_list,
Linux 3.5 compat, iops->truncate_range() removed The vmtruncate_range() support has been removed from the kernel in favor of using the fallocate method in the file_operations table. Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #784
2012-07-23 18:11:25 +00:00
#ifdef HAVE_INODE_TRUNCATE_RANGE
Implement the truncate_range() inode operation. This operation allows "hole punching" in ZFS files. On Solaris this is done via the vop_space() system call, which maps to the zfs_space() function. So we just need to write zpl_truncate_range() as a wrapper around zfs_space(). Note that this only works for regular files, not ZVOLs. This is currently an insecure implementation without permission checking, although this isn't that big of a deal since truncate_range() isn't even callable from userspace. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-01 11:59:41 +00:00
.truncate_range = zpl_truncate_range,
Linux 3.5 compat, iops->truncate_range() removed The vmtruncate_range() support has been removed from the kernel in favor of using the fallocate method in the file_operations table. Signed-off-by: Richard Yao <ryao@cs.stonybrook.edu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #784
2012-07-23 18:11:25 +00:00
#endif /* HAVE_INODE_TRUNCATE_RANGE */
Support the fallocate() file operation. Currently only the (FALLOC_FL_PUNCH_HOLE) flag combination is supported, since it's the only one that matches the behavior of zfs_space(). This makes it pretty much useless in its current form, but it's a start. To support other flag combinations we would need to modify zfs_space() to make it more flexible, or emulate the desired functionality in zpl_fallocate(). Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #334
2011-09-02 07:42:07 +00:00
#ifdef HAVE_INODE_FALLOCATE
.fallocate = zpl_fallocate,
#endif /* HAVE_INODE_FALLOCATE */
Honor CONFIG_FS_POSIX_ACL kernel option The required Posix ACL interfaces are only available for kernels with CONFIG_FS_POSIX_ACL defined. Therefore, only enable Posix ACL support for these kernels. All major distribution kernels enable CONFIG_FS_POSIX_ACL by default. If your kernel does not support Posix ACLs the following warning will be printed at ZFS module load time. "ZFS: Posix ACLs disabled by kernel" Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1825
2013-11-02 23:40:26 +00:00
#if defined(CONFIG_FS_POSIX_ACL)
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
#if defined(HAVE_GET_ACL)
.get_acl = zpl_get_acl,
#elif defined(HAVE_CHECK_ACL)
.check_acl = zpl_check_acl,
#elif defined(HAVE_PERMISSION)
.permission = zpl_permission,
#endif /* HAVE_GET_ACL | HAVE_CHECK_ACL | HAVE_PERMISSION */
Honor CONFIG_FS_POSIX_ACL kernel option The required Posix ACL interfaces are only available for kernels with CONFIG_FS_POSIX_ACL defined. Therefore, only enable Posix ACL support for these kernels. All major distribution kernels enable CONFIG_FS_POSIX_ACL by default. If your kernel does not support Posix ACLs the following warning will be printed at ZFS module load time. "ZFS: Posix ACLs disabled by kernel" Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1825
2013-11-02 23:40:26 +00:00
#endif /* CONFIG_FS_POSIX_ACL */
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
};
const struct inode_operations zpl_dir_inode_operations = {
.create = zpl_create,
.lookup = zpl_lookup,
.link = zpl_link,
.unlink = zpl_unlink,
.symlink = zpl_symlink,
.mkdir = zpl_mkdir,
.rmdir = zpl_rmdir,
.mknod = zpl_mknod,
.rename = zpl_rename,
.setattr = zpl_setattr,
Add get/setattr, get/setxattr hooks While the attr/xattr hooks were already in place for regular files this hooks can also apply to directories and special files. While they aren't typically used in this way, it should be supported. This patch registers these additional callbacks for both directory and special inode types.
2011-02-16 17:55:53 +00:00
.getattr = zpl_getattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = zpl_xattr_list,
Honor CONFIG_FS_POSIX_ACL kernel option The required Posix ACL interfaces are only available for kernels with CONFIG_FS_POSIX_ACL defined. Therefore, only enable Posix ACL support for these kernels. All major distribution kernels enable CONFIG_FS_POSIX_ACL by default. If your kernel does not support Posix ACLs the following warning will be printed at ZFS module load time. "ZFS: Posix ACLs disabled by kernel" Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1825
2013-11-02 23:40:26 +00:00
#if defined(CONFIG_FS_POSIX_ACL)
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
#if defined(HAVE_GET_ACL)
.get_acl = zpl_get_acl,
#elif defined(HAVE_CHECK_ACL)
.check_acl = zpl_check_acl,
#elif defined(HAVE_PERMISSION)
.permission = zpl_permission,
#endif /* HAVE_GET_ACL | HAVE_CHECK_ACL | HAVE_PERMISSION */
Honor CONFIG_FS_POSIX_ACL kernel option The required Posix ACL interfaces are only available for kernels with CONFIG_FS_POSIX_ACL defined. Therefore, only enable Posix ACL support for these kernels. All major distribution kernels enable CONFIG_FS_POSIX_ACL by default. If your kernel does not support Posix ACLs the following warning will be printed at ZFS module load time. "ZFS: Posix ACLs disabled by kernel" Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1825
2013-11-02 23:40:26 +00:00
#endif /* CONFIG_FS_POSIX_ACL */
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
};
const struct inode_operations zpl_symlink_inode_operations = {
.readlink = generic_readlink,
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
#if defined(HAVE_GET_LINK_DELAYED) || defined(HAVE_GET_LINK_COOKIE)
.get_link = zpl_get_link,
#elif defined(HAVE_FOLLOW_LINK_COOKIE) || defined(HAVE_FOLLOW_LINK_NAMEIDATA)
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
.follow_link = zpl_follow_link,
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
#endif
#if defined(HAVE_PUT_LINK_COOKIE) || defined(HAVE_PUT_LINK_NAMEIDATA)
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
.put_link = zpl_put_link,
Linux 4.5 compat: get_link() / put_link() The follow_link() interface was retired in favor of get_link(). In the process of phasing in get_link() the Linux kernel went through two different versions. The first of which depended on put_link() and the final version on a delayed done function. - Improved configure checks for .follow_link, .get_link, .put_link. - Interfaces checked from newest to oldest. - Strict checking for each possible known interface. - Configure fails when no known interface is available. - Both versions .get_link are detected and supported as well two previous versions of .follow_link. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Issue #4228
2016-01-14 18:25:10 +00:00
#endif
Set mtime on symbolic links Register the setattr/getattr callbacks for symlinks. Without these the generic inode_setattr() and generic_fillattr() functions will be used. In the setattr case this will only result in the inode being updated in memory, the dirty_inode callback would also normally run but none is registered for zfs. The straight forward fix is to set the setattr/getattr callbacks for symlinks so they are handled just like files and directories. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #412
2011-10-18 21:51:03 +00:00
.setattr = zpl_setattr,
.getattr = zpl_getattr,
Allow xattrs on symlinks The Solaris version of ZFS does not allow xattrs to be set on symlinks due to the way they implemented the attropen() system call. Linux however implements xattrs through the lgetxattr() and lsetxattr() system calls which do not have this limitation. The only reason this hasn't always worked under ZFS on Linux is that the xattr handlers were not registered for symlink type inodes. This was done simply to be consistent with the Solaris behavior. Upon futher reflection I believe this should be allowed under Linux. The only ill effect would be that the xattrs on symlinks will not be visible when the pool is imported on a Solaris system. This also has the benefit that it allows for SELinux style security xattr labeling which expects to be able to set xattrs on all inode types. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #272
2011-11-29 17:05:04 +00:00
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = zpl_xattr_list,
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
};
const struct inode_operations zpl_special_inode_operations = {
Add get/setattr, get/setxattr hooks While the attr/xattr hooks were already in place for regular files this hooks can also apply to directories and special files. While they aren't typically used in this way, it should be supported. This patch registers these additional callbacks for both directory and special inode types.
2011-02-16 17:55:53 +00:00
.setattr = zpl_setattr,
.getattr = zpl_getattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = zpl_xattr_list,
Honor CONFIG_FS_POSIX_ACL kernel option The required Posix ACL interfaces are only available for kernels with CONFIG_FS_POSIX_ACL defined. Therefore, only enable Posix ACL support for these kernels. All major distribution kernels enable CONFIG_FS_POSIX_ACL by default. If your kernel does not support Posix ACLs the following warning will be printed at ZFS module load time. "ZFS: Posix ACLs disabled by kernel" Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1825
2013-11-02 23:40:26 +00:00
#if defined(CONFIG_FS_POSIX_ACL)
Posix ACL Support This change adds support for Posix ACLs by storing them as an xattr which is common practice for many Linux file systems. Since the Posix ACL is stored as an xattr it will not overwrite any existing ZFS/NFSv4 ACLs which may have been set. The Posix ACL will also be non-functional on other platforms although it may be visible as an xattr if that platform understands SA based xattrs. By default Posix ACLs are disabled but they may be enabled with the new 'aclmode=noacl|posixacl' property. Set the property to 'posixacl' to enable them. If ZFS/NFSv4 ACL support is ever added an appropriate acltype will be added. This change passes the POSIX Test Suite cleanly with the exception of xacl/00.t test 45 which is incorrect for Linux (Ext4 fails too). http://www.tuxera.com/community/posix-test-suite/ Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #170
2013-10-28 16:22:15 +00:00
#if defined(HAVE_GET_ACL)
.get_acl = zpl_get_acl,
#elif defined(HAVE_CHECK_ACL)
.check_acl = zpl_check_acl,
#elif defined(HAVE_PERMISSION)
.permission = zpl_permission,
#endif /* HAVE_GET_ACL | HAVE_CHECK_ACL | HAVE_PERMISSION */
Honor CONFIG_FS_POSIX_ACL kernel option The required Posix ACL interfaces are only available for kernels with CONFIG_FS_POSIX_ACL defined. Therefore, only enable Posix ACL support for these kernels. All major distribution kernels enable CONFIG_FS_POSIX_ACL by default. If your kernel does not support Posix ACLs the following warning will be printed at ZFS module load time. "ZFS: Posix ACLs disabled by kernel" Signed-off-by: Massimo Maggi <me@massimo-maggi.eu> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1825
2013-11-02 23:40:26 +00:00
#endif /* CONFIG_FS_POSIX_ACL */
Add Hooks for Linux Inode Operations The Linux specific inode operations have all been located in the file zpl_inode.c. These functions primarily rely on the reworked zfs_* functions to do their job. They are also responsible for converting the possible Solaris style error codes to negative Linux errors.
2011-01-26 20:08:24 +00:00
};
Fix 'zfs rollback' on mounted file systems Rolling back a mounted filesystem with open file handles and cached dentries+inodes never worked properly in ZoL. The major issue was that Linux provides no easy mechanism for modules to invalidate the inode cache for a file system. Because of this it was possible that an inode from the previous filesystem would not get properly dropped from the cache during rolling back. Then a new inode with the same inode number would be create and collide with the existing cached inode. Ideally this would trigger an VERIFY() but in practice the error wasn't handled and it would just NULL reference. Luckily, this issue can be resolved by sprucing up the existing Solaris zfs_rezget() functionality for the Linux VFS. The way it works now is that when a file system is rolled back all the cached inodes will be traversed and refetched from disk. If a version of the cached inode exists on disk the in-core copy will be updated accordingly. If there is no match for that object on disk it will be unhashed from the inode cache and marked as stale. This will effectively make the inode unfindable for lookups allowing the inode number to be immediately recycled. The inode will then only be accessible from the cached dentries. Subsequent dentry lookups which reference a stale inode will result in the dentry being invalidated. Once invalidated the dentry will drop its reference on the inode allowing it to be safely pruned from the cache. Special care is taken for negative dentries since they do not reference any inode. These dentires will be invalidate based on when they were added to the dentry cache. Entries added before the last rollback will be invalidate to prevent them from masking real files in the dataset. Two nice side effects of this fix are: * Removes the dependency on spl_invalidate_inodes(), it can now be safely removed from the SPL when we choose to do so. * zfs_znode_alloc() no longer requires a dentry to be passed. This effectively reverts this portition of the code to its upstream counterpart. The dentry is not instantiated more correctly in the Linux ZPL layer. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Ned Bass <bass6@llnl.gov> Closes #795
2013-01-16 00:41:09 +00:00
dentry_operations_t zpl_dentry_operations = {
.d_revalidate = zpl_revalidate,
};
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