ebe7e575ea
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
114 lines
4.1 KiB
C
114 lines
4.1 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (C) 2011 Lawrence Livermore National Security, LLC.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* LLNL-CODE-403049.
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* Rewritten for Linux by:
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* Rohan Puri <rohan.puri15@gmail.com>
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* Brian Behlendorf <behlendorf1@llnl.gov>
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*/
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#ifndef _ZFS_CTLDIR_H
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#define _ZFS_CTLDIR_H
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#include <sys/vnode.h>
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#include <sys/zfs_vfsops.h>
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#include <sys/zfs_znode.h>
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#define ZFS_CTLDIR_NAME ".zfs"
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#define ZFS_SNAPDIR_NAME "snapshot"
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#define ZFS_SHAREDIR_NAME "shares"
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#define zfs_has_ctldir(zdp) \
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((zdp)->z_id == ZTOZSB(zdp)->z_root && \
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(ZTOZSB(zdp)->z_ctldir != NULL))
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#define zfs_show_ctldir(zdp) \
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(zfs_has_ctldir(zdp) && \
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(ZTOZSB(zdp)->z_show_ctldir))
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typedef struct {
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char *se_name;
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char *se_path;
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struct inode *se_inode;
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struct delayed_work se_work;
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avl_node_t se_node;
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} zfs_snapentry_t;
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/* zfsctl generic functions */
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extern int snapentry_compare(const void *a, const void *b);
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extern boolean_t zfsctl_is_node(struct inode *ip);
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extern boolean_t zfsctl_is_snapdir(struct inode *ip);
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extern void zfsctl_inode_inactive(struct inode *ip);
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extern void zfsctl_inode_destroy(struct inode *ip);
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extern int zfsctl_create(zfs_sb_t *zsb);
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extern void zfsctl_destroy(zfs_sb_t *zsb);
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extern struct inode *zfsctl_root(znode_t *zp);
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extern int zfsctl_fid(struct inode *ip, fid_t *fidp);
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/* zfsctl '.zfs' functions */
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extern int zfsctl_root_lookup(struct inode *dip, char *name,
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struct inode **ipp, int flags, cred_t *cr, int *direntflags,
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pathname_t *realpnp);
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/* zfsctl '.zfs/snapshot' functions */
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extern int zfsctl_snapdir_lookup(struct inode *dip, char *name,
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struct inode **ipp, int flags, cred_t *cr, int *direntflags,
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pathname_t *realpnp);
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extern int zfsctl_snapdir_rename(struct inode *sdip, char *sname,
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struct inode *tdip, char *tname, cred_t *cr, int flags);
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extern int zfsctl_snapdir_remove(struct inode *dip, char *name, cred_t *cr,
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int flags);
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extern int zfsctl_snapdir_mkdir(struct inode *dip, char *dirname, vattr_t *vap,
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struct inode **ipp, cred_t *cr, int flags);
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extern void zfsctl_snapdir_inactive(struct inode *ip);
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extern int zfsctl_unmount_snapshot(zfs_sb_t *zsb, char *name, int flags);
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extern int zfsctl_unmount_snapshots(zfs_sb_t *zsb, int flags, int *count);
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extern int zfsctl_mount_snapshot(struct path *path, int flags);
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extern int zfsctl_lookup_objset(struct super_block *sb, uint64_t objsetid,
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zfs_sb_t **zsb);
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/* zfsctl '.zfs/shares' functions */
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extern int zfsctl_shares_lookup(struct inode *dip, char *name,
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struct inode **ipp, int flags, cred_t *cr, int *direntflags,
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pathname_t *realpnp);
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/* zfsctl_init/fini functions */
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extern void zfsctl_init(void);
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extern void zfsctl_fini(void);
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/*
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* These inodes numbers are reserved for the .zfs control directory.
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* It is important that they be no larger that 48-bits because only
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* 6 bytes are reserved in the NFS file handle for the object number.
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* However, they should be as large as possible to avoid conflicts
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* with the objects which are assigned monotonically by the dmu.
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*/
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#define ZFSCTL_INO_ROOT 0x0000FFFFFFFFFFFF
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#define ZFSCTL_INO_SHARES 0x0000FFFFFFFFFFFE
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#define ZFSCTL_INO_SNAPDIR 0x0000FFFFFFFFFFFD
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#define ZFSCTL_INO_SNAPDIRS 0x0000FFFFFFFFFFFC
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#define ZFSCTL_EXPIRE_SNAPSHOT 300
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#endif /* _ZFS_CTLDIR_H */
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