freebsd-nq/module/zfs/zpl_inode.c
Chunwei Chen 24ef51f660 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
2015-12-08 16:38:56 -08:00

625 lines
14 KiB
C

/*
* 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.
* Copyright (c) 2015 by Chunwei Chen. All rights reserved.
*/
#include <sys/zfs_ctldir.h>
#include <sys/zfs_vfsops.h>
#include <sys/zfs_vnops.h>
#include <sys/zfs_znode.h>
#include <sys/dmu_objset.h>
#include <sys/vfs.h>
#include <sys/zpl.h>
static struct dentry *
#ifdef HAVE_LOOKUP_NAMEIDATA
zpl_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
#else
zpl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
#endif
{
cred_t *cr = CRED();
struct inode *ip;
int error;
fstrans_cookie_t cookie;
if (dlen(dentry) > ZFS_MAXNAMELEN)
return (ERR_PTR(-ENAMETOOLONG));
crhold(cr);
cookie = spl_fstrans_mark();
error = -zfs_lookup(dir, dname(dentry), &ip, 0, cr, NULL, NULL);
spl_fstrans_unmark(cookie);
ASSERT3S(error, <=, 0);
crfree(cr);
spin_lock(&dentry->d_lock);
dentry->d_time = jiffies;
#ifndef HAVE_S_D_OP
d_set_d_op(dentry, &zpl_dentry_operations);
#endif /* HAVE_S_D_OP */
spin_unlock(&dentry->d_lock);
if (error) {
if (error == -ENOENT)
return (d_splice_alias(NULL, dentry));
else
return (ERR_PTR(error));
}
return (d_splice_alias(ip, dentry));
}
void
zpl_vap_init(vattr_t *vap, struct inode *dir, zpl_umode_t mode, cred_t *cr)
{
vap->va_mask = ATTR_MODE;
vap->va_mode = mode;
vap->va_uid = crgetfsuid(cr);
if (dir && dir->i_mode & S_ISGID) {
vap->va_gid = KGID_TO_SGID(dir->i_gid);
if (S_ISDIR(mode))
vap->va_mode |= S_ISGID;
} else {
vap->va_gid = crgetfsgid(cr);
}
}
static int
#ifdef HAVE_CREATE_NAMEIDATA
zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
struct nameidata *nd)
#else
zpl_create(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
bool flag)
#endif
{
cred_t *cr = CRED();
struct inode *ip;
vattr_t *vap;
int error;
fstrans_cookie_t cookie;
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
zpl_vap_init(vap, dir, mode, cr);
cookie = spl_fstrans_mark();
error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
if (error == 0) {
d_instantiate(dentry, ip);
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);
}
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_mknod(struct inode *dir, struct dentry *dentry, zpl_umode_t mode,
dev_t rdev)
{
cred_t *cr = CRED();
struct inode *ip;
vattr_t *vap;
int error;
fstrans_cookie_t cookie;
/*
* 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);
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
zpl_vap_init(vap, dir, mode, cr);
vap->va_rdev = rdev;
cookie = spl_fstrans_mark();
error = -zfs_create(dir, dname(dentry), vap, 0, mode, &ip, cr, 0, NULL);
if (error == 0) {
d_instantiate(dentry, ip);
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);
}
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_unlink(struct inode *dir, struct dentry *dentry)
{
cred_t *cr = CRED();
int error;
fstrans_cookie_t cookie;
crhold(cr);
cookie = spl_fstrans_mark();
error = -zfs_remove(dir, dname(dentry), cr);
spl_fstrans_unmark(cookie);
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_mkdir(struct inode *dir, struct dentry *dentry, zpl_umode_t mode)
{
cred_t *cr = CRED();
vattr_t *vap;
struct inode *ip;
int error;
fstrans_cookie_t cookie;
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
zpl_vap_init(vap, dir, mode | S_IFDIR, cr);
cookie = spl_fstrans_mark();
error = -zfs_mkdir(dir, dname(dentry), vap, &ip, cr, 0, NULL);
if (error == 0) {
d_instantiate(dentry, ip);
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);
}
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_rmdir(struct inode * dir, struct dentry *dentry)
{
cred_t *cr = CRED();
int error;
fstrans_cookie_t cookie;
crhold(cr);
cookie = spl_fstrans_mark();
error = -zfs_rmdir(dir, dname(dentry), NULL, cr, 0);
spl_fstrans_unmark(cookie);
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
int error;
fstrans_cookie_t cookie;
cookie = spl_fstrans_mark();
error = -zfs_getattr_fast(dentry->d_inode, stat);
spl_fstrans_unmark(cookie);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_setattr(struct dentry *dentry, struct iattr *ia)
{
struct inode *ip = dentry->d_inode;
cred_t *cr = CRED();
vattr_t *vap;
int error;
fstrans_cookie_t cookie;
error = inode_change_ok(ip, ia);
if (error)
return (error);
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
vap->va_mask = ia->ia_valid & ATTR_IATTR_MASK;
vap->va_mode = ia->ia_mode;
vap->va_uid = KUID_TO_SUID(ia->ia_uid);
vap->va_gid = KGID_TO_SGID(ia->ia_gid);
vap->va_size = ia->ia_size;
vap->va_atime = ia->ia_atime;
vap->va_mtime = ia->ia_mtime;
vap->va_ctime = ia->ia_ctime;
cookie = spl_fstrans_mark();
error = -zfs_setattr(ip, vap, 0, cr);
if (!error && (ia->ia_valid & ATTR_MODE))
error = zpl_chmod_acl(ip);
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_rename(struct inode *sdip, struct dentry *sdentry,
struct inode *tdip, struct dentry *tdentry)
{
cred_t *cr = CRED();
int error;
fstrans_cookie_t cookie;
crhold(cr);
cookie = spl_fstrans_mark();
error = -zfs_rename(sdip, dname(sdentry), tdip, dname(tdentry), cr, 0);
spl_fstrans_unmark(cookie);
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
static int
zpl_symlink(struct inode *dir, struct dentry *dentry, const char *name)
{
cred_t *cr = CRED();
vattr_t *vap;
struct inode *ip;
int error;
fstrans_cookie_t cookie;
crhold(cr);
vap = kmem_zalloc(sizeof (vattr_t), KM_SLEEP);
zpl_vap_init(vap, dir, S_IFLNK | S_IRWXUGO, cr);
cookie = spl_fstrans_mark();
error = -zfs_symlink(dir, dname(dentry), vap, (char *)name, &ip, cr, 0);
if (error == 0) {
d_instantiate(dentry, ip);
error = zpl_xattr_security_init(ip, dir, &dentry->d_name);
if (error)
(void) zfs_remove(dir, dname(dentry), cr);
}
spl_fstrans_unmark(cookie);
kmem_free(vap, sizeof (vattr_t));
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
#ifdef HAVE_FOLLOW_LINK_NAMEIDATA
static void *
zpl_follow_link(struct dentry *dentry, struct nameidata *nd)
#else
const char *
zpl_follow_link(struct dentry *dentry, void **symlink_cookie)
#endif
{
cred_t *cr = CRED();
struct inode *ip = dentry->d_inode;
struct iovec iov;
uio_t uio;
char *link;
int error;
fstrans_cookie_t cookie;
crhold(cr);
iov.iov_len = MAXPATHLEN;
iov.iov_base = link = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
uio.uio_iov = &iov;
uio.uio_iovcnt = 1;
uio.uio_skip = 0;
uio.uio_resid = (MAXPATHLEN - 1);
uio.uio_segflg = UIO_SYSSPACE;
cookie = spl_fstrans_mark();
error = -zfs_readlink(ip, &uio, cr);
spl_fstrans_unmark(cookie);
if (error)
kmem_free(link, MAXPATHLEN);
crfree(cr);
#ifdef HAVE_FOLLOW_LINK_NAMEIDATA
if (error)
nd_set_link(nd, ERR_PTR(error));
else
nd_set_link(nd, link);
return (NULL);
#else
if (error)
return (ERR_PTR(error));
else
return (*symlink_cookie = link);
#endif
}
#ifdef 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);
}
#else
static void
zpl_put_link(struct inode *unused, void *symlink_cookie)
{
kmem_free(symlink_cookie, MAXPATHLEN);
}
#endif
static int
zpl_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
{
cred_t *cr = CRED();
struct inode *ip = old_dentry->d_inode;
int error;
fstrans_cookie_t cookie;
if (ip->i_nlink >= ZFS_LINK_MAX)
return (-EMLINK);
crhold(cr);
ip->i_ctime = CURRENT_TIME_SEC;
igrab(ip); /* Use ihold() if available */
cookie = spl_fstrans_mark();
error = -zfs_link(dir, ip, dname(dentry), cr);
if (error) {
iput(ip);
goto out;
}
d_instantiate(dentry, ip);
out:
spl_fstrans_unmark(cookie);
crfree(cr);
ASSERT3S(error, <=, 0);
return (error);
}
#ifdef HAVE_INODE_TRUNCATE_RANGE
static void
zpl_truncate_range(struct inode *ip, loff_t start, loff_t end)
{
cred_t *cr = CRED();
flock64_t bf;
fstrans_cookie_t cookie;
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;
cookie = spl_fstrans_mark();
zfs_space(ip, F_FREESP, &bf, FWRITE, start, cr);
spl_fstrans_unmark(cookie);
crfree(cr);
}
#endif /* HAVE_INODE_TRUNCATE_RANGE */
#ifdef HAVE_INODE_FALLOCATE
static long
zpl_fallocate(struct inode *ip, int mode, loff_t offset, loff_t len)
{
return (zpl_fallocate_common(ip, mode, offset, len));
}
#endif /* HAVE_INODE_FALLOCATE */
static int
#ifdef HAVE_D_REVALIDATE_NAMEIDATA
zpl_revalidate(struct dentry *dentry, struct nameidata *nd)
{
unsigned int flags = (nd ? nd->flags : 0);
#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);
/*
* 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;
zfsctl_snapshot_unmount_delay(zsb->z_os->os_spa,
dmu_objset_id(zsb->z_os), zfs_expire_snapshot);
}
}
/*
* 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);
}
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,
#ifdef HAVE_INODE_TRUNCATE_RANGE
.truncate_range = zpl_truncate_range,
#endif /* HAVE_INODE_TRUNCATE_RANGE */
#ifdef HAVE_INODE_FALLOCATE
.fallocate = zpl_fallocate,
#endif /* HAVE_INODE_FALLOCATE */
#if defined(CONFIG_FS_POSIX_ACL)
#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 */
#endif /* CONFIG_FS_POSIX_ACL */
};
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,
.getattr = zpl_getattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = zpl_xattr_list,
#if defined(CONFIG_FS_POSIX_ACL)
#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 */
#endif /* CONFIG_FS_POSIX_ACL */
};
const struct inode_operations zpl_symlink_inode_operations = {
.readlink = generic_readlink,
.follow_link = zpl_follow_link,
.put_link = zpl_put_link,
.setattr = zpl_setattr,
.getattr = zpl_getattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = zpl_xattr_list,
};
const struct inode_operations zpl_special_inode_operations = {
.setattr = zpl_setattr,
.getattr = zpl_getattr,
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,
.removexattr = generic_removexattr,
.listxattr = zpl_xattr_list,
#if defined(CONFIG_FS_POSIX_ACL)
#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 */
#endif /* CONFIG_FS_POSIX_ACL */
};
dentry_operations_t zpl_dentry_operations = {
.d_revalidate = zpl_revalidate,
};