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linux/fs/xfs/xfs_inode.c
Darrick J. Wong c1442d22a0 xfs: remove XFS_ILOCK_RT* 
Now that we've centralized the realtime metadata locking routines, get
rid of the ILOCK subclasses since we now use explicit lockdep classes.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
2024-11-05 13:38:37 -08:00

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include <linux/iversion.h>
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_dir2.h"
#include "xfs_attr.h"
#include "xfs_bit.h"
#include "xfs_trans_space.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_inode_item.h"
#include "xfs_iunlink_item.h"
#include "xfs_ialloc.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_errortag.h"
#include "xfs_error.h"
#include "xfs_quota.h"
#include "xfs_filestream.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_symlink.h"
#include "xfs_trans_priv.h"
#include "xfs_log.h"
#include "xfs_bmap_btree.h"
#include "xfs_reflink.h"
#include "xfs_ag.h"
#include "xfs_log_priv.h"
#include "xfs_health.h"
#include "xfs_pnfs.h"
#include "xfs_parent.h"
#include "xfs_xattr.h"
#include "xfs_inode_util.h"
#include "xfs_metafile.h"
struct kmem_cache *xfs_inode_cache;
/*
* These two are wrapper routines around the xfs_ilock() routine used to
* centralize some grungy code. They are used in places that wish to lock the
* inode solely for reading the extents. The reason these places can't just
* call xfs_ilock(ip, XFS_ILOCK_SHARED) is that the inode lock also guards to
* bringing in of the extents from disk for a file in b-tree format. If the
* inode is in b-tree format, then we need to lock the inode exclusively until
* the extents are read in. Locking it exclusively all the time would limit
* our parallelism unnecessarily, though. What we do instead is check to see
* if the extents have been read in yet, and only lock the inode exclusively
* if they have not.
*
* The functions return a value which should be given to the corresponding
* xfs_iunlock() call.
*/
uint
xfs_ilock_data_map_shared(
struct xfs_inode *ip)
{
uint lock_mode = XFS_ILOCK_SHARED;
if (xfs_need_iread_extents(&ip->i_df))
lock_mode = XFS_ILOCK_EXCL;
xfs_ilock(ip, lock_mode);
return lock_mode;
}
uint
xfs_ilock_attr_map_shared(
struct xfs_inode *ip)
{
uint lock_mode = XFS_ILOCK_SHARED;
if (xfs_inode_has_attr_fork(ip) && xfs_need_iread_extents(&ip->i_af))
lock_mode = XFS_ILOCK_EXCL;
xfs_ilock(ip, lock_mode);
return lock_mode;
}
/*
* You can't set both SHARED and EXCL for the same lock,
* and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_MMAPLOCK_SHARED,
* XFS_MMAPLOCK_EXCL, XFS_ILOCK_SHARED, XFS_ILOCK_EXCL are valid values
* to set in lock_flags.
*/
static inline void
xfs_lock_flags_assert(
uint lock_flags)
{
ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) !=
(XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL));
ASSERT((lock_flags & (XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL)) !=
(XFS_MMAPLOCK_SHARED | XFS_MMAPLOCK_EXCL));
ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) !=
(XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_SUBCLASS_MASK)) == 0);
ASSERT(lock_flags != 0);
}
/*
* In addition to i_rwsem in the VFS inode, the xfs inode contains 2
* multi-reader locks: invalidate_lock and the i_lock. This routine allows
* various combinations of the locks to be obtained.
*
* The 3 locks should always be ordered so that the IO lock is obtained first,
* the mmap lock second and the ilock last in order to prevent deadlock.
*
* Basic locking order:
*
* i_rwsem -> invalidate_lock -> page_lock -> i_ilock
*
* mmap_lock locking order:
*
* i_rwsem -> page lock -> mmap_lock
* mmap_lock -> invalidate_lock -> page_lock
*
* The difference in mmap_lock locking order mean that we cannot hold the
* invalidate_lock over syscall based read(2)/write(2) based IO. These IO paths
* can fault in pages during copy in/out (for buffered IO) or require the
* mmap_lock in get_user_pages() to map the user pages into the kernel address
* space for direct IO. Similarly the i_rwsem cannot be taken inside a page
* fault because page faults already hold the mmap_lock.
*
* Hence to serialise fully against both syscall and mmap based IO, we need to
* take both the i_rwsem and the invalidate_lock. These locks should *only* be
* both taken in places where we need to invalidate the page cache in a race
* free manner (e.g. truncate, hole punch and other extent manipulation
* functions).
*/
void
xfs_ilock(
xfs_inode_t *ip,
uint lock_flags)
{
trace_xfs_ilock(ip, lock_flags, _RET_IP_);
xfs_lock_flags_assert(lock_flags);
if (lock_flags & XFS_IOLOCK_EXCL) {
down_write_nested(&VFS_I(ip)->i_rwsem,
XFS_IOLOCK_DEP(lock_flags));
} else if (lock_flags & XFS_IOLOCK_SHARED) {
down_read_nested(&VFS_I(ip)->i_rwsem,
XFS_IOLOCK_DEP(lock_flags));
}
if (lock_flags & XFS_MMAPLOCK_EXCL) {
down_write_nested(&VFS_I(ip)->i_mapping->invalidate_lock,
XFS_MMAPLOCK_DEP(lock_flags));
} else if (lock_flags & XFS_MMAPLOCK_SHARED) {
down_read_nested(&VFS_I(ip)->i_mapping->invalidate_lock,
XFS_MMAPLOCK_DEP(lock_flags));
}
if (lock_flags & XFS_ILOCK_EXCL)
down_write_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
else if (lock_flags & XFS_ILOCK_SHARED)
down_read_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags));
}
/*
* This is just like xfs_ilock(), except that the caller
* is guaranteed not to sleep. It returns 1 if it gets
* the requested locks and 0 otherwise. If the IO lock is
* obtained but the inode lock cannot be, then the IO lock
* is dropped before returning.
*
* ip -- the inode being locked
* lock_flags -- this parameter indicates the inode's locks to be
* to be locked. See the comment for xfs_ilock() for a list
* of valid values.
*/
int
xfs_ilock_nowait(
xfs_inode_t *ip,
uint lock_flags)
{
trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_);
xfs_lock_flags_assert(lock_flags);
if (lock_flags & XFS_IOLOCK_EXCL) {
if (!down_write_trylock(&VFS_I(ip)->i_rwsem))
goto out;
} else if (lock_flags & XFS_IOLOCK_SHARED) {
if (!down_read_trylock(&VFS_I(ip)->i_rwsem))
goto out;
}
if (lock_flags & XFS_MMAPLOCK_EXCL) {
if (!down_write_trylock(&VFS_I(ip)->i_mapping->invalidate_lock))
goto out_undo_iolock;
} else if (lock_flags & XFS_MMAPLOCK_SHARED) {
if (!down_read_trylock(&VFS_I(ip)->i_mapping->invalidate_lock))
goto out_undo_iolock;
}
if (lock_flags & XFS_ILOCK_EXCL) {
if (!down_write_trylock(&ip->i_lock))
goto out_undo_mmaplock;
} else if (lock_flags & XFS_ILOCK_SHARED) {
if (!down_read_trylock(&ip->i_lock))
goto out_undo_mmaplock;
}
return 1;
out_undo_mmaplock:
if (lock_flags & XFS_MMAPLOCK_EXCL)
up_write(&VFS_I(ip)->i_mapping->invalidate_lock);
else if (lock_flags & XFS_MMAPLOCK_SHARED)
up_read(&VFS_I(ip)->i_mapping->invalidate_lock);
out_undo_iolock:
if (lock_flags & XFS_IOLOCK_EXCL)
up_write(&VFS_I(ip)->i_rwsem);
else if (lock_flags & XFS_IOLOCK_SHARED)
up_read(&VFS_I(ip)->i_rwsem);
out:
return 0;
}
/*
* xfs_iunlock() is used to drop the inode locks acquired with
* xfs_ilock() and xfs_ilock_nowait(). The caller must pass
* in the flags given to xfs_ilock() or xfs_ilock_nowait() so
* that we know which locks to drop.
*
* ip -- the inode being unlocked
* lock_flags -- this parameter indicates the inode's locks to be
* to be unlocked. See the comment for xfs_ilock() for a list
* of valid values for this parameter.
*
*/
void
xfs_iunlock(
xfs_inode_t *ip,
uint lock_flags)
{
xfs_lock_flags_assert(lock_flags);
if (lock_flags & XFS_IOLOCK_EXCL)
up_write(&VFS_I(ip)->i_rwsem);
else if (lock_flags & XFS_IOLOCK_SHARED)
up_read(&VFS_I(ip)->i_rwsem);
if (lock_flags & XFS_MMAPLOCK_EXCL)
up_write(&VFS_I(ip)->i_mapping->invalidate_lock);
else if (lock_flags & XFS_MMAPLOCK_SHARED)
up_read(&VFS_I(ip)->i_mapping->invalidate_lock);
if (lock_flags & XFS_ILOCK_EXCL)
up_write(&ip->i_lock);
else if (lock_flags & XFS_ILOCK_SHARED)
up_read(&ip->i_lock);
trace_xfs_iunlock(ip, lock_flags, _RET_IP_);
}
/*
* give up write locks. the i/o lock cannot be held nested
* if it is being demoted.
*/
void
xfs_ilock_demote(
xfs_inode_t *ip,
uint lock_flags)
{
ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL));
ASSERT((lock_flags &
~(XFS_IOLOCK_EXCL|XFS_MMAPLOCK_EXCL|XFS_ILOCK_EXCL)) == 0);
if (lock_flags & XFS_ILOCK_EXCL)
downgrade_write(&ip->i_lock);
if (lock_flags & XFS_MMAPLOCK_EXCL)
downgrade_write(&VFS_I(ip)->i_mapping->invalidate_lock);
if (lock_flags & XFS_IOLOCK_EXCL)
downgrade_write(&VFS_I(ip)->i_rwsem);
trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_);
}
void
xfs_assert_ilocked(
struct xfs_inode *ip,
uint lock_flags)
{
/*
* Sometimes we assert the ILOCK is held exclusively, but we're in
* a workqueue, so lockdep doesn't know we're the owner.
*/
if (lock_flags & XFS_ILOCK_SHARED)
rwsem_assert_held(&ip->i_lock);
else if (lock_flags & XFS_ILOCK_EXCL)
rwsem_assert_held_write_nolockdep(&ip->i_lock);
if (lock_flags & XFS_MMAPLOCK_SHARED)
rwsem_assert_held(&VFS_I(ip)->i_mapping->invalidate_lock);
else if (lock_flags & XFS_MMAPLOCK_EXCL)
rwsem_assert_held_write(&VFS_I(ip)->i_mapping->invalidate_lock);
if (lock_flags & XFS_IOLOCK_SHARED)
rwsem_assert_held(&VFS_I(ip)->i_rwsem);
else if (lock_flags & XFS_IOLOCK_EXCL)
rwsem_assert_held_write(&VFS_I(ip)->i_rwsem);
}
/*
* xfs_lockdep_subclass_ok() is only used in an ASSERT, so is only called when
* DEBUG or XFS_WARN is set. And MAX_LOCKDEP_SUBCLASSES is then only defined
* when CONFIG_LOCKDEP is set. Hence the complex define below to avoid build
* errors and warnings.
*/
#if (defined(DEBUG) || defined(XFS_WARN)) && defined(CONFIG_LOCKDEP)
static bool
xfs_lockdep_subclass_ok(
int subclass)
{
return subclass < MAX_LOCKDEP_SUBCLASSES;
}
#else
#define xfs_lockdep_subclass_ok(subclass) (true)
#endif
/*
* Bump the subclass so xfs_lock_inodes() acquires each lock with a different
* value. This can be called for any type of inode lock combination, including
* parent locking. Care must be taken to ensure we don't overrun the subclass
* storage fields in the class mask we build.
*/
static inline uint
xfs_lock_inumorder(
uint lock_mode,
uint subclass)
{
uint class = 0;
ASSERT(!(lock_mode & XFS_ILOCK_PARENT));
ASSERT(xfs_lockdep_subclass_ok(subclass));
if (lock_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)) {
ASSERT(subclass <= XFS_IOLOCK_MAX_SUBCLASS);
class += subclass << XFS_IOLOCK_SHIFT;
}
if (lock_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)) {
ASSERT(subclass <= XFS_MMAPLOCK_MAX_SUBCLASS);
class += subclass << XFS_MMAPLOCK_SHIFT;
}
if (lock_mode & (XFS_ILOCK_SHARED|XFS_ILOCK_EXCL)) {
ASSERT(subclass <= XFS_ILOCK_MAX_SUBCLASS);
class += subclass << XFS_ILOCK_SHIFT;
}
return (lock_mode & ~XFS_LOCK_SUBCLASS_MASK) | class;
}
/*
* The following routine will lock n inodes in exclusive mode. We assume the
* caller calls us with the inodes in i_ino order.
*
* We need to detect deadlock where an inode that we lock is in the AIL and we
* start waiting for another inode that is locked by a thread in a long running
* transaction (such as truncate). This can result in deadlock since the long
* running trans might need to wait for the inode we just locked in order to
* push the tail and free space in the log.
*
* xfs_lock_inodes() can only be used to lock one type of lock at a time -
* the iolock, the mmaplock or the ilock, but not more than one at a time. If we
* lock more than one at a time, lockdep will report false positives saying we
* have violated locking orders.
*/
void
xfs_lock_inodes(
struct xfs_inode **ips,
int inodes,
uint lock_mode)
{
int attempts = 0;
uint i;
int j;
bool try_lock;
struct xfs_log_item *lp;
/*
* Currently supports between 2 and 5 inodes with exclusive locking. We
* support an arbitrary depth of locking here, but absolute limits on
* inodes depend on the type of locking and the limits placed by
* lockdep annotations in xfs_lock_inumorder. These are all checked by
* the asserts.
*/
ASSERT(ips && inodes >= 2 && inodes <= 5);
ASSERT(lock_mode & (XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL |
XFS_ILOCK_EXCL));
ASSERT(!(lock_mode & (XFS_IOLOCK_SHARED | XFS_MMAPLOCK_SHARED |
XFS_ILOCK_SHARED)));
ASSERT(!(lock_mode & XFS_MMAPLOCK_EXCL) ||
inodes <= XFS_MMAPLOCK_MAX_SUBCLASS + 1);
ASSERT(!(lock_mode & XFS_ILOCK_EXCL) ||
inodes <= XFS_ILOCK_MAX_SUBCLASS + 1);
if (lock_mode & XFS_IOLOCK_EXCL) {
ASSERT(!(lock_mode & (XFS_MMAPLOCK_EXCL | XFS_ILOCK_EXCL)));
} else if (lock_mode & XFS_MMAPLOCK_EXCL)
ASSERT(!(lock_mode & XFS_ILOCK_EXCL));
again:
try_lock = false;
i = 0;
for (; i < inodes; i++) {
ASSERT(ips[i]);
if (i && (ips[i] == ips[i - 1])) /* Already locked */
continue;
/*
* If try_lock is not set yet, make sure all locked inodes are
* not in the AIL. If any are, set try_lock to be used later.
*/
if (!try_lock) {
for (j = (i - 1); j >= 0 && !try_lock; j--) {
lp = &ips[j]->i_itemp->ili_item;
if (lp && test_bit(XFS_LI_IN_AIL, &lp->li_flags))
try_lock = true;
}
}
/*
* If any of the previous locks we have locked is in the AIL,
* we must TRY to get the second and subsequent locks. If
* we can't get any, we must release all we have
* and try again.
*/
if (!try_lock) {
xfs_ilock(ips[i], xfs_lock_inumorder(lock_mode, i));
continue;
}
/* try_lock means we have an inode locked that is in the AIL. */
ASSERT(i != 0);
if (xfs_ilock_nowait(ips[i], xfs_lock_inumorder(lock_mode, i)))
continue;
/*
* Unlock all previous guys and try again. xfs_iunlock will try
* to push the tail if the inode is in the AIL.
*/
attempts++;
for (j = i - 1; j >= 0; j--) {
/*
* Check to see if we've already unlocked this one. Not
* the first one going back, and the inode ptr is the
* same.
*/
if (j != (i - 1) && ips[j] == ips[j + 1])
continue;
xfs_iunlock(ips[j], lock_mode);
}
if ((attempts % 5) == 0) {
delay(1); /* Don't just spin the CPU */
}
goto again;
}
}
/*
* xfs_lock_two_inodes() can only be used to lock ilock. The iolock and
* mmaplock must be double-locked separately since we use i_rwsem and
* invalidate_lock for that. We now support taking one lock EXCL and the
* other SHARED.
*/
void
xfs_lock_two_inodes(
struct xfs_inode *ip0,
uint ip0_mode,
struct xfs_inode *ip1,
uint ip1_mode)
{
int attempts = 0;
struct xfs_log_item *lp;
ASSERT(hweight32(ip0_mode) == 1);
ASSERT(hweight32(ip1_mode) == 1);
ASSERT(!(ip0_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
ASSERT(!(ip1_mode & (XFS_IOLOCK_SHARED|XFS_IOLOCK_EXCL)));
ASSERT(!(ip0_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)));
ASSERT(!(ip1_mode & (XFS_MMAPLOCK_SHARED|XFS_MMAPLOCK_EXCL)));
ASSERT(ip0->i_ino != ip1->i_ino);
if (ip0->i_ino > ip1->i_ino) {
swap(ip0, ip1);
swap(ip0_mode, ip1_mode);
}
again:
xfs_ilock(ip0, xfs_lock_inumorder(ip0_mode, 0));
/*
* If the first lock we have locked is in the AIL, we must TRY to get
* the second lock. If we can't get it, we must release the first one
* and try again.
*/
lp = &ip0->i_itemp->ili_item;
if (lp && test_bit(XFS_LI_IN_AIL, &lp->li_flags)) {
if (!xfs_ilock_nowait(ip1, xfs_lock_inumorder(ip1_mode, 1))) {
xfs_iunlock(ip0, ip0_mode);
if ((++attempts % 5) == 0)
delay(1); /* Don't just spin the CPU */
goto again;
}
} else {
xfs_ilock(ip1, xfs_lock_inumorder(ip1_mode, 1));
}
}
/*
* Lookups up an inode from "name". If ci_name is not NULL, then a CI match
* is allowed, otherwise it has to be an exact match. If a CI match is found,
* ci_name->name will point to a the actual name (caller must free) or
* will be set to NULL if an exact match is found.
*/
int
xfs_lookup(
struct xfs_inode *dp,
const struct xfs_name *name,
struct xfs_inode **ipp,
struct xfs_name *ci_name)
{
xfs_ino_t inum;
int error;
trace_xfs_lookup(dp, name);
if (xfs_is_shutdown(dp->i_mount))
return -EIO;
if (xfs_ifork_zapped(dp, XFS_DATA_FORK))
return -EIO;
error = xfs_dir_lookup(NULL, dp, name, &inum, ci_name);
if (error)
goto out_unlock;
error = xfs_iget(dp->i_mount, NULL, inum, 0, 0, ipp);
if (error)
goto out_free_name;
/*
* Fail if a directory entry in the regular directory tree points to
* a metadata file.
*/
if (XFS_IS_CORRUPT(dp->i_mount, xfs_is_metadir_inode(*ipp))) {
xfs_fs_mark_sick(dp->i_mount, XFS_SICK_FS_METADIR);
error = -EFSCORRUPTED;
goto out_irele;
}
return 0;
out_irele:
xfs_irele(*ipp);
out_free_name:
if (ci_name)
kfree(ci_name->name);
out_unlock:
*ipp = NULL;
return error;
}
/*
* Initialise a newly allocated inode and return the in-core inode to the
* caller locked exclusively.
*
* Caller is responsible for unlocking the inode manually upon return
*/
int
xfs_icreate(
struct xfs_trans *tp,
xfs_ino_t ino,
const struct xfs_icreate_args *args,
struct xfs_inode **ipp)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_inode *ip = NULL;
int error;
/*
* Get the in-core inode with the lock held exclusively to prevent
* others from looking at until we're done.
*/
error = xfs_iget(mp, tp, ino, XFS_IGET_CREATE, XFS_ILOCK_EXCL, &ip);
if (error)
return error;
ASSERT(ip != NULL);
xfs_trans_ijoin(tp, ip, 0);
xfs_inode_init(tp, args, ip);
/* now that we have an i_mode we can setup the inode structure */
xfs_setup_inode(ip);
*ipp = ip;
return 0;
}
/* Return dquots for the ids that will be assigned to a new file. */
int
xfs_icreate_dqalloc(
const struct xfs_icreate_args *args,
struct xfs_dquot **udqpp,
struct xfs_dquot **gdqpp,
struct xfs_dquot **pdqpp)
{
struct inode *dir = VFS_I(args->pip);
kuid_t uid = GLOBAL_ROOT_UID;
kgid_t gid = GLOBAL_ROOT_GID;
prid_t prid = 0;
unsigned int flags = XFS_QMOPT_QUOTALL;
if (args->idmap) {
/*
* The uid/gid computation code must match what the VFS uses to
* assign i_[ug]id. INHERIT adjusts the gid computation for
* setgid/grpid systems.
*/
uid = mapped_fsuid(args->idmap, i_user_ns(dir));
gid = mapped_fsgid(args->idmap, i_user_ns(dir));
prid = xfs_get_initial_prid(args->pip);
flags |= XFS_QMOPT_INHERIT;
}
*udqpp = *gdqpp = *pdqpp = NULL;
return xfs_qm_vop_dqalloc(args->pip, uid, gid, prid, flags, udqpp,
gdqpp, pdqpp);
}
int
xfs_create(
const struct xfs_icreate_args *args,
struct xfs_name *name,
struct xfs_inode **ipp)
{
struct xfs_inode *dp = args->pip;
struct xfs_dir_update du = {
.dp = dp,
.name = name,
};
struct xfs_mount *mp = dp->i_mount;
struct xfs_trans *tp = NULL;
struct xfs_dquot *udqp;
struct xfs_dquot *gdqp;
struct xfs_dquot *pdqp;
struct xfs_trans_res *tres;
xfs_ino_t ino;
bool unlock_dp_on_error = false;
bool is_dir = S_ISDIR(args->mode);
uint resblks;
int error;
trace_xfs_create(dp, name);
if (xfs_is_shutdown(mp))
return -EIO;
if (xfs_ifork_zapped(dp, XFS_DATA_FORK))
return -EIO;
/* Make sure that we have allocated dquot(s) on disk. */
error = xfs_icreate_dqalloc(args, &udqp, &gdqp, &pdqp);
if (error)
return error;
if (is_dir) {
resblks = xfs_mkdir_space_res(mp, name->len);
tres = &M_RES(mp)->tr_mkdir;
} else {
resblks = xfs_create_space_res(mp, name->len);
tres = &M_RES(mp)->tr_create;
}
error = xfs_parent_start(mp, &du.ppargs);
if (error)
goto out_release_dquots;
/*
* Initially assume that the file does not exist and
* reserve the resources for that case. If that is not
* the case we'll drop the one we have and get a more
* appropriate transaction later.
*/
error = xfs_trans_alloc_icreate(mp, tres, udqp, gdqp, pdqp, resblks,
&tp);
if (error == -ENOSPC) {
/* flush outstanding delalloc blocks and retry */
xfs_flush_inodes(mp);
error = xfs_trans_alloc_icreate(mp, tres, udqp, gdqp, pdqp,
resblks, &tp);
}
if (error)
goto out_parent;
xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
unlock_dp_on_error = true;
/*
* A newly created regular or special file just has one directory
* entry pointing to them, but a directory also the "." entry
* pointing to itself.
*/
error = xfs_dialloc(&tp, args, &ino);
if (!error)
error = xfs_icreate(tp, ino, args, &du.ip);
if (error)
goto out_trans_cancel;
/*
* Now we join the directory inode to the transaction. We do not do it
* earlier because xfs_dialloc might commit the previous transaction
* (and release all the locks). An error from here on will result in
* the transaction cancel unlocking dp so don't do it explicitly in the
* error path.
*/
xfs_trans_ijoin(tp, dp, 0);
error = xfs_dir_create_child(tp, resblks, &du);
if (error)
goto out_trans_cancel;
/*
* If this is a synchronous mount, make sure that the
* create transaction goes to disk before returning to
* the user.
*/
if (xfs_has_wsync(mp) || xfs_has_dirsync(mp))
xfs_trans_set_sync(tp);
/*
* Attach the dquot(s) to the inodes and modify them incore.
* These ids of the inode couldn't have changed since the new
* inode has been locked ever since it was created.
*/
xfs_qm_vop_create_dqattach(tp, du.ip, udqp, gdqp, pdqp);
error = xfs_trans_commit(tp);
if (error)
goto out_release_inode;
xfs_qm_dqrele(udqp);
xfs_qm_dqrele(gdqp);
xfs_qm_dqrele(pdqp);
*ipp = du.ip;
xfs_iunlock(du.ip, XFS_ILOCK_EXCL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
xfs_parent_finish(mp, du.ppargs);
return 0;
out_trans_cancel:
xfs_trans_cancel(tp);
out_release_inode:
/*
* Wait until after the current transaction is aborted to finish the
* setup of the inode and release the inode. This prevents recursive
* transactions and deadlocks from xfs_inactive.
*/
if (du.ip) {
xfs_iunlock(du.ip, XFS_ILOCK_EXCL);
xfs_finish_inode_setup(du.ip);
xfs_irele(du.ip);
}
out_parent:
xfs_parent_finish(mp, du.ppargs);
out_release_dquots:
xfs_qm_dqrele(udqp);
xfs_qm_dqrele(gdqp);
xfs_qm_dqrele(pdqp);
if (unlock_dp_on_error)
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return error;
}
int
xfs_create_tmpfile(
const struct xfs_icreate_args *args,
struct xfs_inode **ipp)
{
struct xfs_inode *dp = args->pip;
struct xfs_mount *mp = dp->i_mount;
struct xfs_inode *ip = NULL;
struct xfs_trans *tp = NULL;
struct xfs_dquot *udqp;
struct xfs_dquot *gdqp;
struct xfs_dquot *pdqp;
struct xfs_trans_res *tres;
xfs_ino_t ino;
uint resblks;
int error;
ASSERT(args->flags & XFS_ICREATE_TMPFILE);
if (xfs_is_shutdown(mp))
return -EIO;
/* Make sure that we have allocated dquot(s) on disk. */
error = xfs_icreate_dqalloc(args, &udqp, &gdqp, &pdqp);
if (error)
return error;
resblks = XFS_IALLOC_SPACE_RES(mp);
tres = &M_RES(mp)->tr_create_tmpfile;
error = xfs_trans_alloc_icreate(mp, tres, udqp, gdqp, pdqp, resblks,
&tp);
if (error)
goto out_release_dquots;
error = xfs_dialloc(&tp, args, &ino);
if (!error)
error = xfs_icreate(tp, ino, args, &ip);
if (error)
goto out_trans_cancel;
if (xfs_has_wsync(mp))
xfs_trans_set_sync(tp);
/*
* Attach the dquot(s) to the inodes and modify them incore.
* These ids of the inode couldn't have changed since the new
* inode has been locked ever since it was created.
*/
xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
error = xfs_iunlink(tp, ip);
if (error)
goto out_trans_cancel;
error = xfs_trans_commit(tp);
if (error)
goto out_release_inode;
xfs_qm_dqrele(udqp);
xfs_qm_dqrele(gdqp);
xfs_qm_dqrele(pdqp);
*ipp = ip;
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return 0;
out_trans_cancel:
xfs_trans_cancel(tp);
out_release_inode:
/*
* Wait until after the current transaction is aborted to finish the
* setup of the inode and release the inode. This prevents recursive
* transactions and deadlocks from xfs_inactive.
*/
if (ip) {
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_finish_inode_setup(ip);
xfs_irele(ip);
}
out_release_dquots:
xfs_qm_dqrele(udqp);
xfs_qm_dqrele(gdqp);
xfs_qm_dqrele(pdqp);
return error;
}
int
xfs_link(
struct xfs_inode *tdp,
struct xfs_inode *sip,
struct xfs_name *target_name)
{
struct xfs_dir_update du = {
.dp = tdp,
.name = target_name,
.ip = sip,
};
struct xfs_mount *mp = tdp->i_mount;
struct xfs_trans *tp;
int error, nospace_error = 0;
int resblks;
trace_xfs_link(tdp, target_name);
ASSERT(!S_ISDIR(VFS_I(sip)->i_mode));
if (xfs_is_shutdown(mp))
return -EIO;
if (xfs_ifork_zapped(tdp, XFS_DATA_FORK))
return -EIO;
error = xfs_qm_dqattach(sip);
if (error)
goto std_return;
error = xfs_qm_dqattach(tdp);
if (error)
goto std_return;
error = xfs_parent_start(mp, &du.ppargs);
if (error)
goto std_return;
resblks = xfs_link_space_res(mp, target_name->len);
error = xfs_trans_alloc_dir(tdp, &M_RES(mp)->tr_link, sip, &resblks,
&tp, &nospace_error);
if (error)
goto out_parent;
/*
* We don't allow reservationless or quotaless hardlinking when parent
* pointers are enabled because we can't back out if the xattrs must
* grow.
*/
if (du.ppargs && nospace_error) {
error = nospace_error;
goto error_return;
}
/*
* If we are using project inheritance, we only allow hard link
* creation in our tree when the project IDs are the same; else
* the tree quota mechanism could be circumvented.
*/
if (unlikely((tdp->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
tdp->i_projid != sip->i_projid)) {
/*
* Project quota setup skips special files which can
* leave inodes in a PROJINHERIT directory without a
* project ID set. We need to allow links to be made
* to these "project-less" inodes because userspace
* expects them to succeed after project ID setup,
* but everything else should be rejected.
*/
if (!special_file(VFS_I(sip)->i_mode) ||
sip->i_projid != 0) {
error = -EXDEV;
goto error_return;
}
}
error = xfs_dir_add_child(tp, resblks, &du);
if (error)
goto error_return;
/*
* If this is a synchronous mount, make sure that the
* link transaction goes to disk before returning to
* the user.
*/
if (xfs_has_wsync(mp) || xfs_has_dirsync(mp))
xfs_trans_set_sync(tp);
error = xfs_trans_commit(tp);
xfs_iunlock(tdp, XFS_ILOCK_EXCL);
xfs_iunlock(sip, XFS_ILOCK_EXCL);
xfs_parent_finish(mp, du.ppargs);
return error;
error_return:
xfs_trans_cancel(tp);
xfs_iunlock(tdp, XFS_ILOCK_EXCL);
xfs_iunlock(sip, XFS_ILOCK_EXCL);
out_parent:
xfs_parent_finish(mp, du.ppargs);
std_return:
if (error == -ENOSPC && nospace_error)
error = nospace_error;
return error;
}
/* Clear the reflink flag and the cowblocks tag if possible. */
static void
xfs_itruncate_clear_reflink_flags(
struct xfs_inode *ip)
{
struct xfs_ifork *dfork;
struct xfs_ifork *cfork;
if (!xfs_is_reflink_inode(ip))
return;
dfork = xfs_ifork_ptr(ip, XFS_DATA_FORK);
cfork = xfs_ifork_ptr(ip, XFS_COW_FORK);
if (dfork->if_bytes == 0 && cfork->if_bytes == 0)
ip->i_diflags2 &= ~XFS_DIFLAG2_REFLINK;
if (cfork->if_bytes == 0)
xfs_inode_clear_cowblocks_tag(ip);
}
/*
* Free up the underlying blocks past new_size. The new size must be smaller
* than the current size. This routine can be used both for the attribute and
* data fork, and does not modify the inode size, which is left to the caller.
*
* The transaction passed to this routine must have made a permanent log
* reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the
* given transaction and start new ones, so make sure everything involved in
* the transaction is tidy before calling here. Some transaction will be
* returned to the caller to be committed. The incoming transaction must
* already include the inode, and both inode locks must be held exclusively.
* The inode must also be "held" within the transaction. On return the inode
* will be "held" within the returned transaction. This routine does NOT
* require any disk space to be reserved for it within the transaction.
*
* If we get an error, we must return with the inode locked and linked into the
* current transaction. This keeps things simple for the higher level code,
* because it always knows that the inode is locked and held in the transaction
* that returns to it whether errors occur or not. We don't mark the inode
* dirty on error so that transactions can be easily aborted if possible.
*/
int
xfs_itruncate_extents_flags(
struct xfs_trans **tpp,
struct xfs_inode *ip,
int whichfork,
xfs_fsize_t new_size,
int flags)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp = *tpp;
xfs_fileoff_t first_unmap_block;
int error = 0;
xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
if (atomic_read(&VFS_I(ip)->i_count))
xfs_assert_ilocked(ip, XFS_IOLOCK_EXCL);
ASSERT(new_size <= XFS_ISIZE(ip));
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
ASSERT(ip->i_itemp != NULL);
ASSERT(ip->i_itemp->ili_lock_flags == 0);
ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
trace_xfs_itruncate_extents_start(ip, new_size);
flags |= xfs_bmapi_aflag(whichfork);
/*
* Since it is possible for space to become allocated beyond
* the end of the file (in a crash where the space is allocated
* but the inode size is not yet updated), simply remove any
* blocks which show up between the new EOF and the maximum
* possible file size.
*
* We have to free all the blocks to the bmbt maximum offset, even if
* the page cache can't scale that far.
*/
first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
if (!xfs_verify_fileoff(mp, first_unmap_block)) {
WARN_ON_ONCE(first_unmap_block > XFS_MAX_FILEOFF);
return 0;
}
error = xfs_bunmapi_range(&tp, ip, flags, first_unmap_block,
XFS_MAX_FILEOFF);
if (error)
goto out;
if (whichfork == XFS_DATA_FORK) {
/* Remove all pending CoW reservations. */
error = xfs_reflink_cancel_cow_blocks(ip, &tp,
first_unmap_block, XFS_MAX_FILEOFF, true);
if (error)
goto out;
xfs_itruncate_clear_reflink_flags(ip);
}
/*
* Always re-log the inode so that our permanent transaction can keep
* on rolling it forward in the log.
*/
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
trace_xfs_itruncate_extents_end(ip, new_size);
out:
*tpp = tp;
return error;
}
/*
* Mark all the buffers attached to this directory stale. In theory we should
* never be freeing a directory with any blocks at all, but this covers the
* case where we've recovered a directory swap with a "temporary" directory
* created by online repair and now need to dump it.
*/
STATIC void
xfs_inactive_dir(
struct xfs_inode *dp)
{
struct xfs_iext_cursor icur;
struct xfs_bmbt_irec got;
struct xfs_mount *mp = dp->i_mount;
struct xfs_da_geometry *geo = mp->m_dir_geo;
struct xfs_ifork *ifp = xfs_ifork_ptr(dp, XFS_DATA_FORK);
xfs_fileoff_t off;
/*
* Invalidate each directory block. All directory blocks are of
* fsbcount length and alignment, so we only need to walk those same
* offsets. We hold the only reference to this inode, so we must wait
* for the buffer locks.
*/
for_each_xfs_iext(ifp, &icur, &got) {
for (off = round_up(got.br_startoff, geo->fsbcount);
off < got.br_startoff + got.br_blockcount;
off += geo->fsbcount) {
struct xfs_buf *bp = NULL;
xfs_fsblock_t fsbno;
int error;
fsbno = (off - got.br_startoff) + got.br_startblock;
error = xfs_buf_incore(mp->m_ddev_targp,
XFS_FSB_TO_DADDR(mp, fsbno),
XFS_FSB_TO_BB(mp, geo->fsbcount),
XBF_LIVESCAN, &bp);
if (error)
continue;
xfs_buf_stale(bp);
xfs_buf_relse(bp);
}
}
}
/*
* xfs_inactive_truncate
*
* Called to perform a truncate when an inode becomes unlinked.
*/
STATIC int
xfs_inactive_truncate(
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
int error;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
if (error) {
ASSERT(xfs_is_shutdown(mp));
return error;
}
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, 0);
/*
* Log the inode size first to prevent stale data exposure in the event
* of a system crash before the truncate completes. See the related
* comment in xfs_vn_setattr_size() for details.
*/
ip->i_disk_size = 0;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK, 0);
if (error)
goto error_trans_cancel;
ASSERT(ip->i_df.if_nextents == 0);
error = xfs_trans_commit(tp);
if (error)
goto error_unlock;
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return 0;
error_trans_cancel:
xfs_trans_cancel(tp);
error_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
/*
* xfs_inactive_ifree()
*
* Perform the inode free when an inode is unlinked.
*/
STATIC int
xfs_inactive_ifree(
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_trans *tp;
int error;
/*
* We try to use a per-AG reservation for any block needed by the finobt
* tree, but as the finobt feature predates the per-AG reservation
* support a degraded file system might not have enough space for the
* reservation at mount time. In that case try to dip into the reserved
* pool and pray.
*
* Send a warning if the reservation does happen to fail, as the inode
* now remains allocated and sits on the unlinked list until the fs is
* repaired.
*/
if (unlikely(mp->m_finobt_nores)) {
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ifree,
XFS_IFREE_SPACE_RES(mp), 0, XFS_TRANS_RESERVE,
&tp);
} else {
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ifree, 0, 0, 0, &tp);
}
if (error) {
if (error == -ENOSPC) {
xfs_warn_ratelimited(mp,
"Failed to remove inode(s) from unlinked list. "
"Please free space, unmount and run xfs_repair.");
} else {
ASSERT(xfs_is_shutdown(mp));
}
return error;
}
/*
* We do not hold the inode locked across the entire rolling transaction
* here. We only need to hold it for the first transaction that
* xfs_ifree() builds, which may mark the inode XFS_ISTALE if the
* underlying cluster buffer is freed. Relogging an XFS_ISTALE inode
* here breaks the relationship between cluster buffer invalidation and
* stale inode invalidation on cluster buffer item journal commit
* completion, and can result in leaving dirty stale inodes hanging
* around in memory.
*
* We have no need for serialising this inode operation against other
* operations - we freed the inode and hence reallocation is required
* and that will serialise on reallocating the space the deferops need
* to free. Hence we can unlock the inode on the first commit of
* the transaction rather than roll it right through the deferops. This
* avoids relogging the XFS_ISTALE inode.
*
* We check that xfs_ifree() hasn't grown an internal transaction roll
* by asserting that the inode is still locked when it returns.
*/
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
error = xfs_ifree(tp, ip);
xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
if (error) {
/*
* If we fail to free the inode, shut down. The cancel
* might do that, we need to make sure. Otherwise the
* inode might be lost for a long time or forever.
*/
if (!xfs_is_shutdown(mp)) {
xfs_notice(mp, "%s: xfs_ifree returned error %d",
__func__, error);
xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
}
xfs_trans_cancel(tp);
return error;
}
/*
* Credit the quota account(s). The inode is gone.
*/
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_ICOUNT, -1);
return xfs_trans_commit(tp);
}
/*
* Returns true if we need to update the on-disk metadata before we can free
* the memory used by this inode. Updates include freeing post-eof
* preallocations; freeing COW staging extents; and marking the inode free in
* the inobt if it is on the unlinked list.
*/
bool
xfs_inode_needs_inactive(
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *cow_ifp = xfs_ifork_ptr(ip, XFS_COW_FORK);
/*
* If the inode is already free, then there can be nothing
* to clean up here.
*/
if (VFS_I(ip)->i_mode == 0)
return false;
/*
* If this is a read-only mount, don't do this (would generate I/O)
* unless we're in log recovery and cleaning the iunlinked list.
*/
if (xfs_is_readonly(mp) && !xlog_recovery_needed(mp->m_log))
return false;
/* If the log isn't running, push inodes straight to reclaim. */
if (xfs_is_shutdown(mp) || xfs_has_norecovery(mp))
return false;
/* Metadata inodes require explicit resource cleanup. */
if (xfs_is_internal_inode(ip))
return false;
/* Want to clean out the cow blocks if there are any. */
if (cow_ifp && cow_ifp->if_bytes > 0)
return true;
/* Unlinked files must be freed. */
if (VFS_I(ip)->i_nlink == 0)
return true;
/*
* This file isn't being freed, so check if there are post-eof blocks
* to free.
*
* Note: don't bother with iolock here since lockdep complains about
* acquiring it in reclaim context. We have the only reference to the
* inode at this point anyways.
*/
return xfs_can_free_eofblocks(ip);
}
/*
* Save health status somewhere, if we're dumping an inode with uncorrected
* errors and online repair isn't running.
*/
static inline void
xfs_inactive_health(
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_perag *pag;
unsigned int sick;
unsigned int checked;
xfs_inode_measure_sickness(ip, &sick, &checked);
if (!sick)
return;
trace_xfs_inode_unfixed_corruption(ip, sick);
if (sick & XFS_SICK_INO_FORGET)
return;
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
if (!pag) {
/* There had better still be a perag structure! */
ASSERT(0);
return;
}
xfs_ag_mark_sick(pag, XFS_SICK_AG_INODES);
xfs_perag_put(pag);
}
/*
* xfs_inactive
*
* This is called when the vnode reference count for the vnode
* goes to zero. If the file has been unlinked, then it must
* now be truncated. Also, we clear all of the read-ahead state
* kept for the inode here since the file is now closed.
*/
int
xfs_inactive(
xfs_inode_t *ip)
{
struct xfs_mount *mp;
int error = 0;
int truncate = 0;
/*
* If the inode is already free, then there can be nothing
* to clean up here.
*/
if (VFS_I(ip)->i_mode == 0) {
ASSERT(ip->i_df.if_broot_bytes == 0);
goto out;
}
mp = ip->i_mount;
ASSERT(!xfs_iflags_test(ip, XFS_IRECOVERY));
xfs_inactive_health(ip);
/*
* If this is a read-only mount, don't do this (would generate I/O)
* unless we're in log recovery and cleaning the iunlinked list.
*/
if (xfs_is_readonly(mp) && !xlog_recovery_needed(mp->m_log))
goto out;
/* Metadata inodes require explicit resource cleanup. */
if (xfs_is_internal_inode(ip))
goto out;
/* Try to clean out the cow blocks if there are any. */
if (xfs_inode_has_cow_data(ip))
xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, true);
if (VFS_I(ip)->i_nlink != 0) {
/*
* Note: don't bother with iolock here since lockdep complains
* about acquiring it in reclaim context. We have the only
* reference to the inode at this point anyways.
*/
if (xfs_can_free_eofblocks(ip))
error = xfs_free_eofblocks(ip);
goto out;
}
if (S_ISREG(VFS_I(ip)->i_mode) &&
(ip->i_disk_size != 0 || XFS_ISIZE(ip) != 0 ||
xfs_inode_has_filedata(ip)))
truncate = 1;
if (xfs_iflags_test(ip, XFS_IQUOTAUNCHECKED)) {
/*
* If this inode is being inactivated during a quotacheck and
* has not yet been scanned by quotacheck, we /must/ remove
* the dquots from the inode before inactivation changes the
* block and inode counts. Most probably this is a result of
* reloading the incore iunlinked list to purge unrecovered
* unlinked inodes.
*/
xfs_qm_dqdetach(ip);
} else {
error = xfs_qm_dqattach(ip);
if (error)
goto out;
}
if (S_ISDIR(VFS_I(ip)->i_mode) && ip->i_df.if_nextents > 0) {
xfs_inactive_dir(ip);
truncate = 1;
}
if (S_ISLNK(VFS_I(ip)->i_mode))
error = xfs_inactive_symlink(ip);
else if (truncate)
error = xfs_inactive_truncate(ip);
if (error)
goto out;
/*
* If there are attributes associated with the file then blow them away
* now. The code calls a routine that recursively deconstructs the
* attribute fork. If also blows away the in-core attribute fork.
*/
if (xfs_inode_has_attr_fork(ip)) {
error = xfs_attr_inactive(ip);
if (error)
goto out;
}
ASSERT(ip->i_forkoff == 0);
/*
* Free the inode.
*/
error = xfs_inactive_ifree(ip);
out:
/*
* We're done making metadata updates for this inode, so we can release
* the attached dquots.
*/
xfs_qm_dqdetach(ip);
return error;
}
/*
* Find an inode on the unlinked list. This does not take references to the
* inode as we have existence guarantees by holding the AGI buffer lock and that
* only unlinked, referenced inodes can be on the unlinked inode list. If we
* don't find the inode in cache, then let the caller handle the situation.
*/
struct xfs_inode *
xfs_iunlink_lookup(
struct xfs_perag *pag,
xfs_agino_t agino)
{
struct xfs_inode *ip;
rcu_read_lock();
ip = radix_tree_lookup(&pag->pag_ici_root, agino);
if (!ip) {
/* Caller can handle inode not being in memory. */
rcu_read_unlock();
return NULL;
}
/*
* Inode in RCU freeing limbo should not happen. Warn about this and
* let the caller handle the failure.
*/
if (WARN_ON_ONCE(!ip->i_ino)) {
rcu_read_unlock();
return NULL;
}
ASSERT(!xfs_iflags_test(ip, XFS_IRECLAIMABLE | XFS_IRECLAIM));
rcu_read_unlock();
return ip;
}
/*
* Load the inode @next_agino into the cache and set its prev_unlinked pointer
* to @prev_agino. Caller must hold the AGI to synchronize with other changes
* to the unlinked list.
*/
int
xfs_iunlink_reload_next(
struct xfs_trans *tp,
struct xfs_buf *agibp,
xfs_agino_t prev_agino,
xfs_agino_t next_agino)
{
struct xfs_perag *pag = agibp->b_pag;
struct xfs_mount *mp = pag_mount(pag);
struct xfs_inode *next_ip = NULL;
int error;
ASSERT(next_agino != NULLAGINO);
#ifdef DEBUG
rcu_read_lock();
next_ip = radix_tree_lookup(&pag->pag_ici_root, next_agino);
ASSERT(next_ip == NULL);
rcu_read_unlock();
#endif
xfs_info_ratelimited(mp,
"Found unrecovered unlinked inode 0x%x in AG 0x%x. Initiating recovery.",
next_agino, pag_agno(pag));
/*
* Use an untrusted lookup just to be cautious in case the AGI has been
* corrupted and now points at a free inode. That shouldn't happen,
* but we'd rather shut down now since we're already running in a weird
* situation.
*/
error = xfs_iget(mp, tp, xfs_agino_to_ino(pag, next_agino),
XFS_IGET_UNTRUSTED, 0, &next_ip);
if (error) {
xfs_ag_mark_sick(pag, XFS_SICK_AG_AGI);
return error;
}
/* If this is not an unlinked inode, something is very wrong. */
if (VFS_I(next_ip)->i_nlink != 0) {
xfs_ag_mark_sick(pag, XFS_SICK_AG_AGI);
error = -EFSCORRUPTED;
goto rele;
}
next_ip->i_prev_unlinked = prev_agino;
trace_xfs_iunlink_reload_next(next_ip);
rele:
ASSERT(!(VFS_I(next_ip)->i_state & I_DONTCACHE));
if (xfs_is_quotacheck_running(mp) && next_ip)
xfs_iflags_set(next_ip, XFS_IQUOTAUNCHECKED);
xfs_irele(next_ip);
return error;
}
/*
* Look up the inode number specified and if it is not already marked XFS_ISTALE
* mark it stale. We should only find clean inodes in this lookup that aren't
* already stale.
*/
static void
xfs_ifree_mark_inode_stale(
struct xfs_perag *pag,
struct xfs_inode *free_ip,
xfs_ino_t inum)
{
struct xfs_mount *mp = pag_mount(pag);
struct xfs_inode_log_item *iip;
struct xfs_inode *ip;
retry:
rcu_read_lock();
ip = radix_tree_lookup(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, inum));
/* Inode not in memory, nothing to do */
if (!ip) {
rcu_read_unlock();
return;
}
/*
* because this is an RCU protected lookup, we could find a recently
* freed or even reallocated inode during the lookup. We need to check
* under the i_flags_lock for a valid inode here. Skip it if it is not
* valid, the wrong inode or stale.
*/
spin_lock(&ip->i_flags_lock);
if (ip->i_ino != inum || __xfs_iflags_test(ip, XFS_ISTALE))
goto out_iflags_unlock;
/*
* Don't try to lock/unlock the current inode, but we _cannot_ skip the
* other inodes that we did not find in the list attached to the buffer
* and are not already marked stale. If we can't lock it, back off and
* retry.
*/
if (ip != free_ip) {
if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
spin_unlock(&ip->i_flags_lock);
rcu_read_unlock();
delay(1);
goto retry;
}
}
ip->i_flags |= XFS_ISTALE;
/*
* If the inode is flushing, it is already attached to the buffer. All
* we needed to do here is mark the inode stale so buffer IO completion
* will remove it from the AIL.
*/
iip = ip->i_itemp;
if (__xfs_iflags_test(ip, XFS_IFLUSHING)) {
ASSERT(!list_empty(&iip->ili_item.li_bio_list));
ASSERT(iip->ili_last_fields);
goto out_iunlock;
}
/*
* Inodes not attached to the buffer can be released immediately.
* Everything else has to go through xfs_iflush_abort() on journal
* commit as the flock synchronises removal of the inode from the
* cluster buffer against inode reclaim.
*/
if (!iip || list_empty(&iip->ili_item.li_bio_list))
goto out_iunlock;
__xfs_iflags_set(ip, XFS_IFLUSHING);
spin_unlock(&ip->i_flags_lock);
rcu_read_unlock();
/* we have a dirty inode in memory that has not yet been flushed. */
spin_lock(&iip->ili_lock);
iip->ili_last_fields = iip->ili_fields;
iip->ili_fields = 0;
iip->ili_fsync_fields = 0;
spin_unlock(&iip->ili_lock);
ASSERT(iip->ili_last_fields);
if (ip != free_ip)
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return;
out_iunlock:
if (ip != free_ip)
xfs_iunlock(ip, XFS_ILOCK_EXCL);
out_iflags_unlock:
spin_unlock(&ip->i_flags_lock);
rcu_read_unlock();
}
/*
* A big issue when freeing the inode cluster is that we _cannot_ skip any
* inodes that are in memory - they all must be marked stale and attached to
* the cluster buffer.
*/
static int
xfs_ifree_cluster(
struct xfs_trans *tp,
struct xfs_perag *pag,
struct xfs_inode *free_ip,
struct xfs_icluster *xic)
{
struct xfs_mount *mp = free_ip->i_mount;
struct xfs_ino_geometry *igeo = M_IGEO(mp);
struct xfs_buf *bp;
xfs_daddr_t blkno;
xfs_ino_t inum = xic->first_ino;
int nbufs;
int i, j;
int ioffset;
int error;
nbufs = igeo->ialloc_blks / igeo->blocks_per_cluster;
for (j = 0; j < nbufs; j++, inum += igeo->inodes_per_cluster) {
/*
* The allocation bitmap tells us which inodes of the chunk were
* physically allocated. Skip the cluster if an inode falls into
* a sparse region.
*/
ioffset = inum - xic->first_ino;
if ((xic->alloc & XFS_INOBT_MASK(ioffset)) == 0) {
ASSERT(ioffset % igeo->inodes_per_cluster == 0);
continue;
}
blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
XFS_INO_TO_AGBNO(mp, inum));
/*
* We obtain and lock the backing buffer first in the process
* here to ensure dirty inodes attached to the buffer remain in
* the flushing state while we mark them stale.
*
* If we scan the in-memory inodes first, then buffer IO can
* complete before we get a lock on it, and hence we may fail
* to mark all the active inodes on the buffer stale.
*/
error = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
mp->m_bsize * igeo->blocks_per_cluster,
XBF_UNMAPPED, &bp);
if (error)
return error;
/*
* This buffer may not have been correctly initialised as we
* didn't read it from disk. That's not important because we are
* only using to mark the buffer as stale in the log, and to
* attach stale cached inodes on it.
*
* For the inode that triggered the cluster freeing, this
* attachment may occur in xfs_inode_item_precommit() after we
* have marked this buffer stale. If this buffer was not in
* memory before xfs_ifree_cluster() started, it will not be
* marked XBF_DONE and this will cause problems later in
* xfs_inode_item_precommit() when we trip over a (stale, !done)
* buffer to attached to the transaction.
*
* Hence we have to mark the buffer as XFS_DONE here. This is
* safe because we are also marking the buffer as XBF_STALE and
* XFS_BLI_STALE. That means it will never be dispatched for
* IO and it won't be unlocked until the cluster freeing has
* been committed to the journal and the buffer unpinned. If it
* is written, we want to know about it, and we want it to
* fail. We can acheive this by adding a write verifier to the
* buffer.
*/
bp->b_flags |= XBF_DONE;
bp->b_ops = &xfs_inode_buf_ops;
/*
* Now we need to set all the cached clean inodes as XFS_ISTALE,
* too. This requires lookups, and will skip inodes that we've
* already marked XFS_ISTALE.
*/
for (i = 0; i < igeo->inodes_per_cluster; i++)
xfs_ifree_mark_inode_stale(pag, free_ip, inum + i);
xfs_trans_stale_inode_buf(tp, bp);
xfs_trans_binval(tp, bp);
}
return 0;
}
/*
* This is called to return an inode to the inode free list. The inode should
* already be truncated to 0 length and have no pages associated with it. This
* routine also assumes that the inode is already a part of the transaction.
*
* The on-disk copy of the inode will have been added to the list of unlinked
* inodes in the AGI. We need to remove the inode from that list atomically with
* respect to freeing it here.
*/
int
xfs_ifree(
struct xfs_trans *tp,
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_perag *pag;
struct xfs_icluster xic = { 0 };
struct xfs_inode_log_item *iip = ip->i_itemp;
int error;
xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
ASSERT(VFS_I(ip)->i_nlink == 0);
ASSERT(ip->i_df.if_nextents == 0);
ASSERT(ip->i_disk_size == 0 || !S_ISREG(VFS_I(ip)->i_mode));
ASSERT(ip->i_nblocks == 0);
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
error = xfs_inode_uninit(tp, pag, ip, &xic);
if (error)
goto out;
if (xfs_iflags_test(ip, XFS_IPRESERVE_DM_FIELDS))
xfs_iflags_clear(ip, XFS_IPRESERVE_DM_FIELDS);
/* Don't attempt to replay owner changes for a deleted inode */
spin_lock(&iip->ili_lock);
iip->ili_fields &= ~(XFS_ILOG_AOWNER | XFS_ILOG_DOWNER);
spin_unlock(&iip->ili_lock);
if (xic.deleted)
error = xfs_ifree_cluster(tp, pag, ip, &xic);
out:
xfs_perag_put(pag);
return error;
}
/*
* This is called to unpin an inode. The caller must have the inode locked
* in at least shared mode so that the buffer cannot be subsequently pinned
* once someone is waiting for it to be unpinned.
*/
static void
xfs_iunpin(
struct xfs_inode *ip)
{
xfs_assert_ilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED);
trace_xfs_inode_unpin_nowait(ip, _RET_IP_);
/* Give the log a push to start the unpinning I/O */
xfs_log_force_seq(ip->i_mount, ip->i_itemp->ili_commit_seq, 0, NULL);
}
static void
__xfs_iunpin_wait(
struct xfs_inode *ip)
{
wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_IPINNED_BIT);
DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_IPINNED_BIT);
xfs_iunpin(ip);
do {
prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
if (xfs_ipincount(ip))
io_schedule();
} while (xfs_ipincount(ip));
finish_wait(wq, &wait.wq_entry);
}
void
xfs_iunpin_wait(
struct xfs_inode *ip)
{
if (xfs_ipincount(ip))
__xfs_iunpin_wait(ip);
}
/*
* Removing an inode from the namespace involves removing the directory entry
* and dropping the link count on the inode. Removing the directory entry can
* result in locking an AGF (directory blocks were freed) and removing a link
* count can result in placing the inode on an unlinked list which results in
* locking an AGI.
*
* The big problem here is that we have an ordering constraint on AGF and AGI
* locking - inode allocation locks the AGI, then can allocate a new extent for
* new inodes, locking the AGF after the AGI. Similarly, freeing the inode
* removes the inode from the unlinked list, requiring that we lock the AGI
* first, and then freeing the inode can result in an inode chunk being freed
* and hence freeing disk space requiring that we lock an AGF.
*
* Hence the ordering that is imposed by other parts of the code is AGI before
* AGF. This means we cannot remove the directory entry before we drop the inode
* reference count and put it on the unlinked list as this results in a lock
* order of AGF then AGI, and this can deadlock against inode allocation and
* freeing. Therefore we must drop the link counts before we remove the
* directory entry.
*
* This is still safe from a transactional point of view - it is not until we
* get to xfs_defer_finish() that we have the possibility of multiple
* transactions in this operation. Hence as long as we remove the directory
* entry and drop the link count in the first transaction of the remove
* operation, there are no transactional constraints on the ordering here.
*/
int
xfs_remove(
struct xfs_inode *dp,
struct xfs_name *name,
struct xfs_inode *ip)
{
struct xfs_dir_update du = {
.dp = dp,
.name = name,
.ip = ip,
};
struct xfs_mount *mp = dp->i_mount;
struct xfs_trans *tp = NULL;
int is_dir = S_ISDIR(VFS_I(ip)->i_mode);
int dontcare;
int error = 0;
uint resblks;
trace_xfs_remove(dp, name);
if (xfs_is_shutdown(mp))
return -EIO;
if (xfs_ifork_zapped(dp, XFS_DATA_FORK))
return -EIO;
error = xfs_qm_dqattach(dp);
if (error)
goto std_return;
error = xfs_qm_dqattach(ip);
if (error)
goto std_return;
error = xfs_parent_start(mp, &du.ppargs);
if (error)
goto std_return;
/*
* We try to get the real space reservation first, allowing for
* directory btree deletion(s) implying possible bmap insert(s). If we
* can't get the space reservation then we use 0 instead, and avoid the
* bmap btree insert(s) in the directory code by, if the bmap insert
* tries to happen, instead trimming the LAST block from the directory.
*
* Ignore EDQUOT and ENOSPC being returned via nospace_error because
* the directory code can handle a reservationless update and we don't
* want to prevent a user from trying to free space by deleting things.
*/
resblks = xfs_remove_space_res(mp, name->len);
error = xfs_trans_alloc_dir(dp, &M_RES(mp)->tr_remove, ip, &resblks,
&tp, &dontcare);
if (error) {
ASSERT(error != -ENOSPC);
goto out_parent;
}
error = xfs_dir_remove_child(tp, resblks, &du);
if (error)
goto out_trans_cancel;
/*
* If this is a synchronous mount, make sure that the
* remove transaction goes to disk before returning to
* the user.
*/
if (xfs_has_wsync(mp) || xfs_has_dirsync(mp))
xfs_trans_set_sync(tp);
error = xfs_trans_commit(tp);
if (error)
goto out_unlock;
if (is_dir && xfs_inode_is_filestream(ip))
xfs_filestream_deassociate(ip);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
xfs_parent_finish(mp, du.ppargs);
return 0;
out_trans_cancel:
xfs_trans_cancel(tp);
out_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
out_parent:
xfs_parent_finish(mp, du.ppargs);
std_return:
return error;
}
static inline void
xfs_iunlock_rename(
struct xfs_inode **i_tab,
int num_inodes)
{
int i;
for (i = num_inodes - 1; i >= 0; i--) {
/* Skip duplicate inodes if src and target dps are the same */
if (!i_tab[i] || (i > 0 && i_tab[i] == i_tab[i - 1]))
continue;
xfs_iunlock(i_tab[i], XFS_ILOCK_EXCL);
}
}
/*
* Enter all inodes for a rename transaction into a sorted array.
*/
#define __XFS_SORT_INODES 5
STATIC void
xfs_sort_for_rename(
struct xfs_inode *dp1, /* in: old (source) directory inode */
struct xfs_inode *dp2, /* in: new (target) directory inode */
struct xfs_inode *ip1, /* in: inode of old entry */
struct xfs_inode *ip2, /* in: inode of new entry */
struct xfs_inode *wip, /* in: whiteout inode */
struct xfs_inode **i_tab,/* out: sorted array of inodes */
int *num_inodes) /* in/out: inodes in array */
{
int i;
ASSERT(*num_inodes == __XFS_SORT_INODES);
memset(i_tab, 0, *num_inodes * sizeof(struct xfs_inode *));
/*
* i_tab contains a list of pointers to inodes. We initialize
* the table here & we'll sort it. We will then use it to
* order the acquisition of the inode locks.
*
* Note that the table may contain duplicates. e.g., dp1 == dp2.
*/
i = 0;
i_tab[i++] = dp1;
i_tab[i++] = dp2;
i_tab[i++] = ip1;
if (ip2)
i_tab[i++] = ip2;
if (wip)
i_tab[i++] = wip;
*num_inodes = i;
xfs_sort_inodes(i_tab, *num_inodes);
}
void
xfs_sort_inodes(
struct xfs_inode **i_tab,
unsigned int num_inodes)
{
int i, j;
ASSERT(num_inodes <= __XFS_SORT_INODES);
/*
* Sort the elements via bubble sort. (Remember, there are at
* most 5 elements to sort, so this is adequate.)
*/
for (i = 0; i < num_inodes; i++) {
for (j = 1; j < num_inodes; j++) {
if (i_tab[j]->i_ino < i_tab[j-1]->i_ino)
swap(i_tab[j], i_tab[j - 1]);
}
}
}
/*
* xfs_rename_alloc_whiteout()
*
* Return a referenced, unlinked, unlocked inode that can be used as a
* whiteout in a rename transaction. We use a tmpfile inode here so that if we
* crash between allocating the inode and linking it into the rename transaction
* recovery will free the inode and we won't leak it.
*/
static int
xfs_rename_alloc_whiteout(
struct mnt_idmap *idmap,
struct xfs_name *src_name,
struct xfs_inode *dp,
struct xfs_inode **wip)
{
struct xfs_icreate_args args = {
.idmap = idmap,
.pip = dp,
.mode = S_IFCHR | WHITEOUT_MODE,
.flags = XFS_ICREATE_TMPFILE,
};
struct xfs_inode *tmpfile;
struct qstr name;
int error;
error = xfs_create_tmpfile(&args, &tmpfile);
if (error)
return error;
name.name = src_name->name;
name.len = src_name->len;
error = xfs_inode_init_security(VFS_I(tmpfile), VFS_I(dp), &name);
if (error) {
xfs_finish_inode_setup(tmpfile);
xfs_irele(tmpfile);
return error;
}
/*
* Prepare the tmpfile inode as if it were created through the VFS.
* Complete the inode setup and flag it as linkable. nlink is already
* zero, so we can skip the drop_nlink.
*/
xfs_setup_iops(tmpfile);
xfs_finish_inode_setup(tmpfile);
VFS_I(tmpfile)->i_state |= I_LINKABLE;
*wip = tmpfile;
return 0;
}
/*
* xfs_rename
*/
int
xfs_rename(
struct mnt_idmap *idmap,
struct xfs_inode *src_dp,
struct xfs_name *src_name,
struct xfs_inode *src_ip,
struct xfs_inode *target_dp,
struct xfs_name *target_name,
struct xfs_inode *target_ip,
unsigned int flags)
{
struct xfs_dir_update du_src = {
.dp = src_dp,
.name = src_name,
.ip = src_ip,
};
struct xfs_dir_update du_tgt = {
.dp = target_dp,
.name = target_name,
.ip = target_ip,
};
struct xfs_dir_update du_wip = { };
struct xfs_mount *mp = src_dp->i_mount;
struct xfs_trans *tp;
struct xfs_inode *inodes[__XFS_SORT_INODES];
int i;
int num_inodes = __XFS_SORT_INODES;
bool new_parent = (src_dp != target_dp);
bool src_is_directory = S_ISDIR(VFS_I(src_ip)->i_mode);
int spaceres;
bool retried = false;
int error, nospace_error = 0;
trace_xfs_rename(src_dp, target_dp, src_name, target_name);
if ((flags & RENAME_EXCHANGE) && !target_ip)
return -EINVAL;
/*
* If we are doing a whiteout operation, allocate the whiteout inode
* we will be placing at the target and ensure the type is set
* appropriately.
*/
if (flags & RENAME_WHITEOUT) {
error = xfs_rename_alloc_whiteout(idmap, src_name, target_dp,
&du_wip.ip);
if (error)
return error;
/* setup target dirent info as whiteout */
src_name->type = XFS_DIR3_FT_CHRDEV;
}
xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip, du_wip.ip,
inodes, &num_inodes);
error = xfs_parent_start(mp, &du_src.ppargs);
if (error)
goto out_release_wip;
if (du_wip.ip) {
error = xfs_parent_start(mp, &du_wip.ppargs);
if (error)
goto out_src_ppargs;
}
if (target_ip) {
error = xfs_parent_start(mp, &du_tgt.ppargs);
if (error)
goto out_wip_ppargs;
}
retry:
nospace_error = 0;
spaceres = xfs_rename_space_res(mp, src_name->len, target_ip != NULL,
target_name->len, du_wip.ip != NULL);
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_rename, spaceres, 0, 0, &tp);
if (error == -ENOSPC) {
nospace_error = error;
spaceres = 0;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_rename, 0, 0, 0,
&tp);
}
if (error)
goto out_tgt_ppargs;
/*
* We don't allow reservationless renaming when parent pointers are
* enabled because we can't back out if the xattrs must grow.
*/
if (du_src.ppargs && nospace_error) {
error = nospace_error;
xfs_trans_cancel(tp);
goto out_tgt_ppargs;
}
/*
* Attach the dquots to the inodes
*/
error = xfs_qm_vop_rename_dqattach(inodes);
if (error) {
xfs_trans_cancel(tp);
goto out_tgt_ppargs;
}
/*
* Lock all the participating inodes. Depending upon whether
* the target_name exists in the target directory, and
* whether the target directory is the same as the source
* directory, we can lock from 2 to 5 inodes.
*/
xfs_lock_inodes(inodes, num_inodes, XFS_ILOCK_EXCL);
/*
* Join all the inodes to the transaction.
*/
xfs_trans_ijoin(tp, src_dp, 0);
if (new_parent)
xfs_trans_ijoin(tp, target_dp, 0);
xfs_trans_ijoin(tp, src_ip, 0);
if (target_ip)
xfs_trans_ijoin(tp, target_ip, 0);
if (du_wip.ip)
xfs_trans_ijoin(tp, du_wip.ip, 0);
/*
* If we are using project inheritance, we only allow renames
* into our tree when the project IDs are the same; else the
* tree quota mechanism would be circumvented.
*/
if (unlikely((target_dp->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
target_dp->i_projid != src_ip->i_projid)) {
error = -EXDEV;
goto out_trans_cancel;
}
/* RENAME_EXCHANGE is unique from here on. */
if (flags & RENAME_EXCHANGE) {
error = xfs_dir_exchange_children(tp, &du_src, &du_tgt,
spaceres);
if (error)
goto out_trans_cancel;
goto out_commit;
}
/*
* Try to reserve quota to handle an expansion of the target directory.
* We'll allow the rename to continue in reservationless mode if we hit
* a space usage constraint. If we trigger reservationless mode, save
* the errno if there isn't any free space in the target directory.
*/
if (spaceres != 0) {
error = xfs_trans_reserve_quota_nblks(tp, target_dp, spaceres,
0, false);
if (error == -EDQUOT || error == -ENOSPC) {
if (!retried) {
xfs_trans_cancel(tp);
xfs_iunlock_rename(inodes, num_inodes);
xfs_blockgc_free_quota(target_dp, 0);
retried = true;
goto retry;
}
nospace_error = error;
spaceres = 0;
error = 0;
}
if (error)
goto out_trans_cancel;
}
/*
* We don't allow quotaless renaming when parent pointers are enabled
* because we can't back out if the xattrs must grow.
*/
if (du_src.ppargs && nospace_error) {
error = nospace_error;
goto out_trans_cancel;
}
/*
* Lock the AGI buffers we need to handle bumping the nlink of the
* whiteout inode off the unlinked list and to handle dropping the
* nlink of the target inode. Per locking order rules, do this in
* increasing AG order and before directory block allocation tries to
* grab AGFs because we grab AGIs before AGFs.
*
* The (vfs) caller must ensure that if src is a directory then
* target_ip is either null or an empty directory.
*/
for (i = 0; i < num_inodes && inodes[i] != NULL; i++) {
if (inodes[i] == du_wip.ip ||
(inodes[i] == target_ip &&
(VFS_I(target_ip)->i_nlink == 1 || src_is_directory))) {
struct xfs_perag *pag;
struct xfs_buf *bp;
pag = xfs_perag_get(mp,
XFS_INO_TO_AGNO(mp, inodes[i]->i_ino));
error = xfs_read_agi(pag, tp, 0, &bp);
xfs_perag_put(pag);
if (error)
goto out_trans_cancel;
}
}
error = xfs_dir_rename_children(tp, &du_src, &du_tgt, spaceres,
&du_wip);
if (error)
goto out_trans_cancel;
if (du_wip.ip) {
/*
* Now we have a real link, clear the "I'm a tmpfile" state
* flag from the inode so it doesn't accidentally get misused in
* future.
*/
VFS_I(du_wip.ip)->i_state &= ~I_LINKABLE;
}
out_commit:
/*
* If this is a synchronous mount, make sure that the rename
* transaction goes to disk before returning to the user.
*/
if (xfs_has_wsync(tp->t_mountp) || xfs_has_dirsync(tp->t_mountp))
xfs_trans_set_sync(tp);
error = xfs_trans_commit(tp);
nospace_error = 0;
goto out_unlock;
out_trans_cancel:
xfs_trans_cancel(tp);
out_unlock:
xfs_iunlock_rename(inodes, num_inodes);
out_tgt_ppargs:
xfs_parent_finish(mp, du_tgt.ppargs);
out_wip_ppargs:
xfs_parent_finish(mp, du_wip.ppargs);
out_src_ppargs:
xfs_parent_finish(mp, du_src.ppargs);
out_release_wip:
if (du_wip.ip)
xfs_irele(du_wip.ip);
if (error == -ENOSPC && nospace_error)
error = nospace_error;
return error;
}
static int
xfs_iflush(
struct xfs_inode *ip,
struct xfs_buf *bp)
{
struct xfs_inode_log_item *iip = ip->i_itemp;
struct xfs_dinode *dip;
struct xfs_mount *mp = ip->i_mount;
int error;
xfs_assert_ilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED);
ASSERT(xfs_iflags_test(ip, XFS_IFLUSHING));
ASSERT(ip->i_df.if_format != XFS_DINODE_FMT_BTREE ||
ip->i_df.if_nextents > XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK));
ASSERT(iip->ili_item.li_buf == bp);
dip = xfs_buf_offset(bp, ip->i_imap.im_boffset);
/*
* We don't flush the inode if any of the following checks fail, but we
* do still update the log item and attach to the backing buffer as if
* the flush happened. This is a formality to facilitate predictable
* error handling as the caller will shutdown and fail the buffer.
*/
error = -EFSCORRUPTED;
if (XFS_TEST_ERROR(dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC),
mp, XFS_ERRTAG_IFLUSH_1)) {
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
"%s: Bad inode %llu magic number 0x%x, ptr "PTR_FMT,
__func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip);
goto flush_out;
}
if (S_ISREG(VFS_I(ip)->i_mode)) {
if (XFS_TEST_ERROR(
ip->i_df.if_format != XFS_DINODE_FMT_EXTENTS &&
ip->i_df.if_format != XFS_DINODE_FMT_BTREE,
mp, XFS_ERRTAG_IFLUSH_3)) {
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
"%s: Bad regular inode %llu, ptr "PTR_FMT,
__func__, ip->i_ino, ip);
goto flush_out;
}
} else if (S_ISDIR(VFS_I(ip)->i_mode)) {
if (XFS_TEST_ERROR(
ip->i_df.if_format != XFS_DINODE_FMT_EXTENTS &&
ip->i_df.if_format != XFS_DINODE_FMT_BTREE &&
ip->i_df.if_format != XFS_DINODE_FMT_LOCAL,
mp, XFS_ERRTAG_IFLUSH_4)) {
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
"%s: Bad directory inode %llu, ptr "PTR_FMT,
__func__, ip->i_ino, ip);
goto flush_out;
}
}
if (XFS_TEST_ERROR(ip->i_df.if_nextents + xfs_ifork_nextents(&ip->i_af) >
ip->i_nblocks, mp, XFS_ERRTAG_IFLUSH_5)) {
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
"%s: detected corrupt incore inode %llu, "
"total extents = %llu nblocks = %lld, ptr "PTR_FMT,
__func__, ip->i_ino,
ip->i_df.if_nextents + xfs_ifork_nextents(&ip->i_af),
ip->i_nblocks, ip);
goto flush_out;
}
if (XFS_TEST_ERROR(ip->i_forkoff > mp->m_sb.sb_inodesize,
mp, XFS_ERRTAG_IFLUSH_6)) {
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
"%s: bad inode %llu, forkoff 0x%x, ptr "PTR_FMT,
__func__, ip->i_ino, ip->i_forkoff, ip);
goto flush_out;
}
/*
* Inode item log recovery for v2 inodes are dependent on the flushiter
* count for correct sequencing. We bump the flush iteration count so
* we can detect flushes which postdate a log record during recovery.
* This is redundant as we now log every change and hence this can't
* happen but we need to still do it to ensure backwards compatibility
* with old kernels that predate logging all inode changes.
*/
if (!xfs_has_v3inodes(mp))
ip->i_flushiter++;
/*
* If there are inline format data / attr forks attached to this inode,
* make sure they are not corrupt.
*/
if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL &&
xfs_ifork_verify_local_data(ip))
goto flush_out;
if (xfs_inode_has_attr_fork(ip) &&
ip->i_af.if_format == XFS_DINODE_FMT_LOCAL &&
xfs_ifork_verify_local_attr(ip))
goto flush_out;
/*
* Copy the dirty parts of the inode into the on-disk inode. We always
* copy out the core of the inode, because if the inode is dirty at all
* the core must be.
*/
xfs_inode_to_disk(ip, dip, iip->ili_item.li_lsn);
/* Wrap, we never let the log put out DI_MAX_FLUSH */
if (!xfs_has_v3inodes(mp)) {
if (ip->i_flushiter == DI_MAX_FLUSH)
ip->i_flushiter = 0;
}
xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
if (xfs_inode_has_attr_fork(ip))
xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK);
/*
* We've recorded everything logged in the inode, so we'd like to clear
* the ili_fields bits so we don't log and flush things unnecessarily.
* However, we can't stop logging all this information until the data
* we've copied into the disk buffer is written to disk. If we did we
* might overwrite the copy of the inode in the log with all the data
* after re-logging only part of it, and in the face of a crash we
* wouldn't have all the data we need to recover.
*
* What we do is move the bits to the ili_last_fields field. When
* logging the inode, these bits are moved back to the ili_fields field.
* In the xfs_buf_inode_iodone() routine we clear ili_last_fields, since
* we know that the information those bits represent is permanently on
* disk. As long as the flush completes before the inode is logged
* again, then both ili_fields and ili_last_fields will be cleared.
*/
error = 0;
flush_out:
spin_lock(&iip->ili_lock);
iip->ili_last_fields = iip->ili_fields;
iip->ili_fields = 0;
iip->ili_fsync_fields = 0;
set_bit(XFS_LI_FLUSHING, &iip->ili_item.li_flags);
spin_unlock(&iip->ili_lock);
/*
* Store the current LSN of the inode so that we can tell whether the
* item has moved in the AIL from xfs_buf_inode_iodone().
*/
xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
&iip->ili_item.li_lsn);
/* generate the checksum. */
xfs_dinode_calc_crc(mp, dip);
if (error)
xfs_inode_mark_sick(ip, XFS_SICK_INO_CORE);
return error;
}
/*
* Non-blocking flush of dirty inode metadata into the backing buffer.
*
* The caller must have a reference to the inode and hold the cluster buffer
* locked. The function will walk across all the inodes on the cluster buffer it
* can find and lock without blocking, and flush them to the cluster buffer.
*
* On successful flushing of at least one inode, the caller must write out the
* buffer and release it. If no inodes are flushed, -EAGAIN will be returned and
* the caller needs to release the buffer. On failure, the filesystem will be
* shut down, the buffer will have been unlocked and released, and EFSCORRUPTED
* will be returned.
*/
int
xfs_iflush_cluster(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_mount;
struct xfs_log_item *lip, *n;
struct xfs_inode *ip;
struct xfs_inode_log_item *iip;
int clcount = 0;
int error = 0;
/*
* We must use the safe variant here as on shutdown xfs_iflush_abort()
* will remove itself from the list.
*/
list_for_each_entry_safe(lip, n, &bp->b_li_list, li_bio_list) {
iip = (struct xfs_inode_log_item *)lip;
ip = iip->ili_inode;
/*
* Quick and dirty check to avoid locks if possible.
*/
if (__xfs_iflags_test(ip, XFS_IRECLAIM | XFS_IFLUSHING))
continue;
if (xfs_ipincount(ip))
continue;
/*
* The inode is still attached to the buffer, which means it is
* dirty but reclaim might try to grab it. Check carefully for
* that, and grab the ilock while still holding the i_flags_lock
* to guarantee reclaim will not be able to reclaim this inode
* once we drop the i_flags_lock.
*/
spin_lock(&ip->i_flags_lock);
ASSERT(!__xfs_iflags_test(ip, XFS_ISTALE));
if (__xfs_iflags_test(ip, XFS_IRECLAIM | XFS_IFLUSHING)) {
spin_unlock(&ip->i_flags_lock);
continue;
}
/*
* ILOCK will pin the inode against reclaim and prevent
* concurrent transactions modifying the inode while we are
* flushing the inode. If we get the lock, set the flushing
* state before we drop the i_flags_lock.
*/
if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
spin_unlock(&ip->i_flags_lock);
continue;
}
__xfs_iflags_set(ip, XFS_IFLUSHING);
spin_unlock(&ip->i_flags_lock);
/*
* Abort flushing this inode if we are shut down because the
* inode may not currently be in the AIL. This can occur when
* log I/O failure unpins the inode without inserting into the
* AIL, leaving a dirty/unpinned inode attached to the buffer
* that otherwise looks like it should be flushed.
*/
if (xlog_is_shutdown(mp->m_log)) {
xfs_iunpin_wait(ip);
xfs_iflush_abort(ip);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
error = -EIO;
continue;
}
/* don't block waiting on a log force to unpin dirty inodes */
if (xfs_ipincount(ip)) {
xfs_iflags_clear(ip, XFS_IFLUSHING);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
continue;
}
if (!xfs_inode_clean(ip))
error = xfs_iflush(ip, bp);
else
xfs_iflags_clear(ip, XFS_IFLUSHING);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (error)
break;
clcount++;
}
if (error) {
/*
* Shutdown first so we kill the log before we release this
* buffer. If it is an INODE_ALLOC buffer and pins the tail
* of the log, failing it before the _log_ is shut down can
* result in the log tail being moved forward in the journal
* on disk because log writes can still be taking place. Hence
* unpinning the tail will allow the ICREATE intent to be
* removed from the log an recovery will fail with uninitialised
* inode cluster buffers.
*/
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
bp->b_flags |= XBF_ASYNC;
xfs_buf_ioend_fail(bp);
return error;
}
if (!clcount)
return -EAGAIN;
XFS_STATS_INC(mp, xs_icluster_flushcnt);
XFS_STATS_ADD(mp, xs_icluster_flushinode, clcount);
return 0;
}
/* Release an inode. */
void
xfs_irele(
struct xfs_inode *ip)
{
trace_xfs_irele(ip, _RET_IP_);
iput(VFS_I(ip));
}
/*
* Ensure all commited transactions touching the inode are written to the log.
*/
int
xfs_log_force_inode(
struct xfs_inode *ip)
{
xfs_csn_t seq = 0;
xfs_ilock(ip, XFS_ILOCK_SHARED);
if (xfs_ipincount(ip))
seq = ip->i_itemp->ili_commit_seq;
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (!seq)
return 0;
return xfs_log_force_seq(ip->i_mount, seq, XFS_LOG_SYNC, NULL);
}
/*
* Grab the exclusive iolock for a data copy from src to dest, making sure to
* abide vfs locking order (lowest pointer value goes first) and breaking the
* layout leases before proceeding. The loop is needed because we cannot call
* the blocking break_layout() with the iolocks held, and therefore have to
* back out both locks.
*/
static int
xfs_iolock_two_inodes_and_break_layout(
struct inode *src,
struct inode *dest)
{
int error;
if (src > dest)
swap(src, dest);
retry:
/* Wait to break both inodes' layouts before we start locking. */
error = break_layout(src, true);
if (error)
return error;
if (src != dest) {
error = break_layout(dest, true);
if (error)
return error;
}
/* Lock one inode and make sure nobody got in and leased it. */
inode_lock(src);
error = break_layout(src, false);
if (error) {
inode_unlock(src);
if (error == -EWOULDBLOCK)
goto retry;
return error;
}
if (src == dest)
return 0;
/* Lock the other inode and make sure nobody got in and leased it. */
inode_lock_nested(dest, I_MUTEX_NONDIR2);
error = break_layout(dest, false);
if (error) {
inode_unlock(src);
inode_unlock(dest);
if (error == -EWOULDBLOCK)
goto retry;
return error;
}
return 0;
}
static int
xfs_mmaplock_two_inodes_and_break_dax_layout(
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
int error;
bool retry;
struct page *page;
if (ip1->i_ino > ip2->i_ino)
swap(ip1, ip2);
again:
retry = false;
/* Lock the first inode */
xfs_ilock(ip1, XFS_MMAPLOCK_EXCL);
error = xfs_break_dax_layouts(VFS_I(ip1), &retry);
if (error || retry) {
xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
if (error == 0 && retry)
goto again;
return error;
}
if (ip1 == ip2)
return 0;
/* Nested lock the second inode */
xfs_ilock(ip2, xfs_lock_inumorder(XFS_MMAPLOCK_EXCL, 1));
/*
* We cannot use xfs_break_dax_layouts() directly here because it may
* need to unlock & lock the XFS_MMAPLOCK_EXCL which is not suitable
* for this nested lock case.
*/
page = dax_layout_busy_page(VFS_I(ip2)->i_mapping);
if (page && page_ref_count(page) != 1) {
xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL);
xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
goto again;
}
return 0;
}
/*
* Lock two inodes so that userspace cannot initiate I/O via file syscalls or
* mmap activity.
*/
int
xfs_ilock2_io_mmap(
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
int ret;
ret = xfs_iolock_two_inodes_and_break_layout(VFS_I(ip1), VFS_I(ip2));
if (ret)
return ret;
if (IS_DAX(VFS_I(ip1)) && IS_DAX(VFS_I(ip2))) {
ret = xfs_mmaplock_two_inodes_and_break_dax_layout(ip1, ip2);
if (ret) {
inode_unlock(VFS_I(ip2));
if (ip1 != ip2)
inode_unlock(VFS_I(ip1));
return ret;
}
} else
filemap_invalidate_lock_two(VFS_I(ip1)->i_mapping,
VFS_I(ip2)->i_mapping);
return 0;
}
/* Unlock both inodes to allow IO and mmap activity. */
void
xfs_iunlock2_io_mmap(
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
if (IS_DAX(VFS_I(ip1)) && IS_DAX(VFS_I(ip2))) {
xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL);
if (ip1 != ip2)
xfs_iunlock(ip1, XFS_MMAPLOCK_EXCL);
} else
filemap_invalidate_unlock_two(VFS_I(ip1)->i_mapping,
VFS_I(ip2)->i_mapping);
inode_unlock(VFS_I(ip2));
if (ip1 != ip2)
inode_unlock(VFS_I(ip1));
}
/* Drop the MMAPLOCK and the IOLOCK after a remap completes. */
void
xfs_iunlock2_remapping(
struct xfs_inode *ip1,
struct xfs_inode *ip2)
{
xfs_iflags_clear(ip1, XFS_IREMAPPING);
if (ip1 != ip2)
xfs_iunlock(ip1, XFS_MMAPLOCK_SHARED);
xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL);
if (ip1 != ip2)
inode_unlock_shared(VFS_I(ip1));
inode_unlock(VFS_I(ip2));
}
/*
* Reload the incore inode list for this inode. Caller should ensure that
* the link count cannot change, either by taking ILOCK_SHARED or otherwise
* preventing other threads from executing.
*/
int
xfs_inode_reload_unlinked_bucket(
struct xfs_trans *tp,
struct xfs_inode *ip)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_buf *agibp;
struct xfs_agi *agi;
struct xfs_perag *pag;
xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
xfs_agino_t prev_agino, next_agino;
unsigned int bucket;
bool foundit = false;
int error;
/* Grab the first inode in the list */
pag = xfs_perag_get(mp, agno);
error = xfs_ialloc_read_agi(pag, tp, 0, &agibp);
xfs_perag_put(pag);
if (error)
return error;
/*
* We've taken ILOCK_SHARED and the AGI buffer lock to stabilize the
* incore unlinked list pointers for this inode. Check once more to
* see if we raced with anyone else to reload the unlinked list.
*/
if (!xfs_inode_unlinked_incomplete(ip)) {
foundit = true;
goto out_agibp;
}
bucket = agino % XFS_AGI_UNLINKED_BUCKETS;
agi = agibp->b_addr;
trace_xfs_inode_reload_unlinked_bucket(ip);
xfs_info_ratelimited(mp,
"Found unrecovered unlinked inode 0x%x in AG 0x%x. Initiating list recovery.",
agino, agno);
prev_agino = NULLAGINO;
next_agino = be32_to_cpu(agi->agi_unlinked[bucket]);
while (next_agino != NULLAGINO) {
struct xfs_inode *next_ip = NULL;
/* Found this caller's inode, set its backlink. */
if (next_agino == agino) {
next_ip = ip;
next_ip->i_prev_unlinked = prev_agino;
foundit = true;
goto next_inode;
}
/* Try in-memory lookup first. */
next_ip = xfs_iunlink_lookup(pag, next_agino);
if (next_ip)
goto next_inode;
/* Inode not in memory, try reloading it. */
error = xfs_iunlink_reload_next(tp, agibp, prev_agino,
next_agino);
if (error)
break;
/* Grab the reloaded inode. */
next_ip = xfs_iunlink_lookup(pag, next_agino);
if (!next_ip) {
/* No incore inode at all? We reloaded it... */
ASSERT(next_ip != NULL);
error = -EFSCORRUPTED;
break;
}
next_inode:
prev_agino = next_agino;
next_agino = next_ip->i_next_unlinked;
}
out_agibp:
xfs_trans_brelse(tp, agibp);
/* Should have found this inode somewhere in the iunlinked bucket. */
if (!error && !foundit)
error = -EFSCORRUPTED;
return error;
}
/* Decide if this inode is missing its unlinked list and reload it. */
int
xfs_inode_reload_unlinked(
struct xfs_inode *ip)
{
struct xfs_trans *tp;
int error;
error = xfs_trans_alloc_empty(ip->i_mount, &tp);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_SHARED);
if (xfs_inode_unlinked_incomplete(ip))
error = xfs_inode_reload_unlinked_bucket(tp, ip);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
xfs_trans_cancel(tp);
return error;
}
/* Has this inode fork been zapped by repair? */
bool
xfs_ifork_zapped(
const struct xfs_inode *ip,
int whichfork)
{
unsigned int datamask = 0;
switch (whichfork) {
case XFS_DATA_FORK:
switch (ip->i_vnode.i_mode & S_IFMT) {
case S_IFDIR:
datamask = XFS_SICK_INO_DIR_ZAPPED;
break;
case S_IFLNK:
datamask = XFS_SICK_INO_SYMLINK_ZAPPED;
break;
}
return ip->i_sick & (XFS_SICK_INO_BMBTD_ZAPPED | datamask);
case XFS_ATTR_FORK:
return ip->i_sick & XFS_SICK_INO_BMBTA_ZAPPED;
default:
return false;
}
}
/* Compute the number of data and realtime blocks used by a file. */
void
xfs_inode_count_blocks(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_filblks_t *dblocks,
xfs_filblks_t *rblocks)
{
struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK);
*rblocks = 0;
if (XFS_IS_REALTIME_INODE(ip))
xfs_bmap_count_leaves(ifp, rblocks);
*dblocks = ip->i_nblocks - *rblocks;
}
static void
xfs_wait_dax_page(
struct inode *inode)
{
struct xfs_inode *ip = XFS_I(inode);
xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
schedule();
xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
}
int
xfs_break_dax_layouts(
struct inode *inode,
bool *retry)
{
struct page *page;
xfs_assert_ilocked(XFS_I(inode), XFS_MMAPLOCK_EXCL);
page = dax_layout_busy_page(inode->i_mapping);
if (!page)
return 0;
*retry = true;
return ___wait_var_event(&page->_refcount,
atomic_read(&page->_refcount) == 1, TASK_INTERRUPTIBLE,
0, 0, xfs_wait_dax_page(inode));
}
int
xfs_break_layouts(
struct inode *inode,
uint *iolock,
enum layout_break_reason reason)
{
bool retry;
int error;
xfs_assert_ilocked(XFS_I(inode), XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL);
do {
retry = false;
switch (reason) {
case BREAK_UNMAP:
error = xfs_break_dax_layouts(inode, &retry);
if (error || retry)
break;
fallthrough;
case BREAK_WRITE:
error = xfs_break_leased_layouts(inode, iolock, &retry);
break;
default:
WARN_ON_ONCE(1);
error = -EINVAL;
}
} while (error == 0 && retry);
return error;
}
/* Returns the size of fundamental allocation unit for a file, in bytes. */
unsigned int
xfs_inode_alloc_unitsize(
struct xfs_inode *ip)
{
unsigned int blocks = 1;
if (XFS_IS_REALTIME_INODE(ip))
blocks = ip->i_mount->m_sb.sb_rextsize;
return XFS_FSB_TO_B(ip->i_mount, blocks);
}
/* Should we always be using copy on write for file writes? */
bool
xfs_is_always_cow_inode(
const struct xfs_inode *ip)
{
return ip->i_mount->m_always_cow && xfs_has_reflink(ip->i_mount);
}
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