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linux/fs/xfs/xfs_trans.c
Darrick J. Wong 4613b17cc4 xfs: introduce in-memory inode unlink log items 
To facilitate future improvements in inode logging and improving
 inode cluster buffer locking order consistency, we need a new
 mechanism for defering inode cluster buffer modifications during
 unlinked list modifications.
 
 The unlinked inode list buffer locking is complex. The unlinked
 list is unordered - we add to the tail, remove from where-ever the
 inode is in the list. Hence we might need to lock two inode buffers
 here (previous inode in list and the one being removed). While we
 can order the locking of these buffers correctly within the confines
 of the unlinked list, there may be other inodes that need buffer
 locking in the same transaction. e.g. O_TMPFILE being linked into a
 directory also modifies the directory inode.
 
 Hence we need a mechanism for defering unlinked inode list updates
 until a point where we know that all modifications have been made
 and all that remains is to lock and modify the cluster buffers.
 
 We can do this by first observing that we serialise unlinked list
 modifications by holding the AGI buffer lock. IOWs, the AGI is going
 to be locked until the transaction commits any time we modify the
 unlinked list. Hence it doesn't matter when in the unlink
 transactions that we actually load, lock and modify the inode
 cluster buffer.
 
 We add an in-memory unlinked inode log item to defer the inode
 cluster buffer update to transaction commit time where it can be
 ordered with all the other inode cluster operations that need to be
 done. Essentially all we need to do is record the inodes that need
 to have their unlinked list pointer updated in a new log item that
 we attached to the transaction.
 
 This log item exists purely for the purpose of delaying the update
 of the unlinked list pointer until the inode cluster buffer can be
 locked in the correct order around the other inode cluster buffers.
 It plays no part in the actual commit, and there's no change to
 anything that is written to the log. i.e. the inode cluster buffers
 still have to be fully logged here (not just ordered) as log
 recovery depedends on this to replay mods to the unlinked inode
 list.
 
 Hence if we add a "precommit" hook into xfs_trans_commit()
 to run a "precommit" operation on these iunlink log items, we can
 delay the locking, modification and logging of the inode cluster
 buffer until after all other modifications have been made. The
 precommit hook reuires us to sort the items that are going to be run
 so that we can lock precommit items in the correct order as we
 perform the modifications they describe.
 
 To make this unlinked inode list processing simpler and easier to
 implement as a log item, we need to change the way we track the
 unlinked list in memory. Starting from the observation that an inode
 on the unlinked list is pinned in memory by the VFS, we can use the
 xfs_inode itself to track the unlinked list. To do this efficiently,
 we want the unlinked list to be a double linked list. The problem
 here is that we need a list per AGI unlinked list, and there are 64
 of these per AGI. The approach taken in this patchset is to shadow
 the AGI unlinked list heads in the perag, and link inodes by agino,
 hence requiring only 8 extra bytes per inode to track this state.
 
 We can then use the agino pointers for lockless inode cache lookups
 to retreive the inode. The aginos in the inode are modified only
 under the AGI lock, just like the cluster buffer pointers, so we
 don't need any extra locking here.  The i_next_unlinked field tracks
 the on-disk value of the unlinked list, and the i_prev_unlinked is a
 purely in-memory pointer that enables us to efficiently remove
 inodes from the middle of the list.
 
 This results in moving a lot of the unlink modification work into
 the precommit operations on the unlink log item. Tracking all the
 unlinked inodes in the inodes themselves also gets rid of the
 unlinked list reference hash table that is used to track this back
 pointer relationship. This greatly simplifies the the unlinked list
 modification code, and removes memory allocations in this hot path
 to track back pointers. This, overall, slightly reduces the CPU
 overhead of the unlink path.
 
 The result of this log item means that we move all the actual
 manipulation of objects to be logged out of the iunlink path and
 into the iunlink item. This allows for future optimisation of this
 mechanism without needing changes to high level unlink path, as
 well as making the unlink lock ordering predictable and synchronised
 with other operations that may require inode cluster locking.
 
 Signed-off-by: Dave Chinner <dchinner@redhat.com>
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Merge tag 'xfs-iunlink-item-5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs into xfs-5.20-mergeB

xfs: introduce in-memory inode unlink log items

To facilitate future improvements in inode logging and improving
inode cluster buffer locking order consistency, we need a new
mechanism for defering inode cluster buffer modifications during
unlinked list modifications.

The unlinked inode list buffer locking is complex. The unlinked
list is unordered - we add to the tail, remove from where-ever the
inode is in the list. Hence we might need to lock two inode buffers
here (previous inode in list and the one being removed). While we
can order the locking of these buffers correctly within the confines
of the unlinked list, there may be other inodes that need buffer
locking in the same transaction. e.g. O_TMPFILE being linked into a
directory also modifies the directory inode.

Hence we need a mechanism for defering unlinked inode list updates
until a point where we know that all modifications have been made
and all that remains is to lock and modify the cluster buffers.

We can do this by first observing that we serialise unlinked list
modifications by holding the AGI buffer lock. IOWs, the AGI is going
to be locked until the transaction commits any time we modify the
unlinked list. Hence it doesn't matter when in the unlink
transactions that we actually load, lock and modify the inode
cluster buffer.

We add an in-memory unlinked inode log item to defer the inode
cluster buffer update to transaction commit time where it can be
ordered with all the other inode cluster operations that need to be
done. Essentially all we need to do is record the inodes that need
to have their unlinked list pointer updated in a new log item that
we attached to the transaction.

This log item exists purely for the purpose of delaying the update
of the unlinked list pointer until the inode cluster buffer can be
locked in the correct order around the other inode cluster buffers.
It plays no part in the actual commit, and there's no change to
anything that is written to the log. i.e. the inode cluster buffers
still have to be fully logged here (not just ordered) as log
recovery depedends on this to replay mods to the unlinked inode
list.

Hence if we add a "precommit" hook into xfs_trans_commit()
to run a "precommit" operation on these iunlink log items, we can
delay the locking, modification and logging of the inode cluster
buffer until after all other modifications have been made. The
precommit hook reuires us to sort the items that are going to be run
so that we can lock precommit items in the correct order as we
perform the modifications they describe.

To make this unlinked inode list processing simpler and easier to
implement as a log item, we need to change the way we track the
unlinked list in memory. Starting from the observation that an inode
on the unlinked list is pinned in memory by the VFS, we can use the
xfs_inode itself to track the unlinked list. To do this efficiently,
we want the unlinked list to be a double linked list. The problem
here is that we need a list per AGI unlinked list, and there are 64
of these per AGI. The approach taken in this patchset is to shadow
the AGI unlinked list heads in the perag, and link inodes by agino,
hence requiring only 8 extra bytes per inode to track this state.

We can then use the agino pointers for lockless inode cache lookups
to retreive the inode. The aginos in the inode are modified only
under the AGI lock, just like the cluster buffer pointers, so we
don't need any extra locking here.  The i_next_unlinked field tracks
the on-disk value of the unlinked list, and the i_prev_unlinked is a
purely in-memory pointer that enables us to efficiently remove
inodes from the middle of the list.

This results in moving a lot of the unlink modification work into
the precommit operations on the unlink log item. Tracking all the
unlinked inodes in the inodes themselves also gets rid of the
unlinked list reference hash table that is used to track this back
pointer relationship. This greatly simplifies the the unlinked list
modification code, and removes memory allocations in this hot path
to track back pointers. This, overall, slightly reduces the CPU
overhead of the unlink path.

The result of this log item means that we move all the actual
manipulation of objects to be logged out of the iunlink path and
into the iunlink item. This allows for future optimisation of this
mechanism without needing changes to high level unlink path, as
well as making the unlink lock ordering predictable and synchronised
with other operations that may require inode cluster locking.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

* tag 'xfs-iunlink-item-5.20' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs:
  xfs: add in-memory iunlink log item
  xfs: add log item precommit operation
  xfs: combine iunlink inode update functions
  xfs: clean up xfs_iunlink_update_inode()
  xfs: double link the unlinked inode list
  xfs: introduce xfs_iunlink_lookup
  xfs: refactor xlog_recover_process_iunlinks()
  xfs: track the iunlink list pointer in the xfs_inode
  xfs: factor the xfs_iunlink functions
  xfs: flush inode gc workqueue before clearing agi bucket
2022-07-14 09:21:42 -07:00

1434 lines
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C
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* Copyright (C) 2010 Red Hat, Inc.
* All Rights Reserved.
*/
#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_extent_busy.h"
#include "xfs_quota.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_log.h"
#include "xfs_log_priv.h"
#include "xfs_trace.h"
#include "xfs_error.h"
#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_dquot_item.h"
#include "xfs_dquot.h"
#include "xfs_icache.h"
struct kmem_cache *xfs_trans_cache;
#if defined(CONFIG_TRACEPOINTS)
static void
xfs_trans_trace_reservations(
struct xfs_mount *mp)
{
struct xfs_trans_res *res;
struct xfs_trans_res *end_res;
int i;
res = (struct xfs_trans_res *)M_RES(mp);
end_res = (struct xfs_trans_res *)(M_RES(mp) + 1);
for (i = 0; res < end_res; i++, res++)
trace_xfs_trans_resv_calc(mp, i, res);
}
#else
# define xfs_trans_trace_reservations(mp)
#endif
/*
* Initialize the precomputed transaction reservation values
* in the mount structure.
*/
void
xfs_trans_init(
struct xfs_mount *mp)
{
xfs_trans_resv_calc(mp, M_RES(mp));
xfs_trans_trace_reservations(mp);
}
/*
* Free the transaction structure. If there is more clean up
* to do when the structure is freed, add it here.
*/
STATIC void
xfs_trans_free(
struct xfs_trans *tp)
{
xfs_extent_busy_sort(&tp->t_busy);
xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
trace_xfs_trans_free(tp, _RET_IP_);
xfs_trans_clear_context(tp);
if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
sb_end_intwrite(tp->t_mountp->m_super);
xfs_trans_free_dqinfo(tp);
kmem_cache_free(xfs_trans_cache, tp);
}
/*
* This is called to create a new transaction which will share the
* permanent log reservation of the given transaction. The remaining
* unused block and rt extent reservations are also inherited. This
* implies that the original transaction is no longer allowed to allocate
* blocks. Locks and log items, however, are no inherited. They must
* be added to the new transaction explicitly.
*/
STATIC struct xfs_trans *
xfs_trans_dup(
struct xfs_trans *tp)
{
struct xfs_trans *ntp;
trace_xfs_trans_dup(tp, _RET_IP_);
ntp = kmem_cache_zalloc(xfs_trans_cache, GFP_KERNEL | __GFP_NOFAIL);
/*
* Initialize the new transaction structure.
*/
ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
ntp->t_mountp = tp->t_mountp;
INIT_LIST_HEAD(&ntp->t_items);
INIT_LIST_HEAD(&ntp->t_busy);
INIT_LIST_HEAD(&ntp->t_dfops);
ntp->t_firstblock = NULLFSBLOCK;
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
ASSERT(tp->t_ticket != NULL);
ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
(tp->t_flags & XFS_TRANS_RESERVE) |
(tp->t_flags & XFS_TRANS_NO_WRITECOUNT) |
(tp->t_flags & XFS_TRANS_RES_FDBLKS);
/* We gave our writer reference to the new transaction */
tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
tp->t_blk_res = tp->t_blk_res_used;
ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
tp->t_rtx_res = tp->t_rtx_res_used;
xfs_trans_switch_context(tp, ntp);
/* move deferred ops over to the new tp */
xfs_defer_move(ntp, tp);
xfs_trans_dup_dqinfo(tp, ntp);
return ntp;
}
/*
* This is called to reserve free disk blocks and log space for the
* given transaction. This must be done before allocating any resources
* within the transaction.
*
* This will return ENOSPC if there are not enough blocks available.
* It will sleep waiting for available log space.
* The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
* is used by long running transactions. If any one of the reservations
* fails then they will all be backed out.
*
* This does not do quota reservations. That typically is done by the
* caller afterwards.
*/
static int
xfs_trans_reserve(
struct xfs_trans *tp,
struct xfs_trans_res *resp,
uint blocks,
uint rtextents)
{
struct xfs_mount *mp = tp->t_mountp;
int error = 0;
bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
/*
* Attempt to reserve the needed disk blocks by decrementing
* the number needed from the number available. This will
* fail if the count would go below zero.
*/
if (blocks > 0) {
error = xfs_mod_fdblocks(mp, -((int64_t)blocks), rsvd);
if (error != 0)
return -ENOSPC;
tp->t_blk_res += blocks;
}
/*
* Reserve the log space needed for this transaction.
*/
if (resp->tr_logres > 0) {
bool permanent = false;
ASSERT(tp->t_log_res == 0 ||
tp->t_log_res == resp->tr_logres);
ASSERT(tp->t_log_count == 0 ||
tp->t_log_count == resp->tr_logcount);
if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
permanent = true;
} else {
ASSERT(tp->t_ticket == NULL);
ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
}
if (tp->t_ticket != NULL) {
ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
error = xfs_log_regrant(mp, tp->t_ticket);
} else {
error = xfs_log_reserve(mp, resp->tr_logres,
resp->tr_logcount,
&tp->t_ticket, permanent);
}
if (error)
goto undo_blocks;
tp->t_log_res = resp->tr_logres;
tp->t_log_count = resp->tr_logcount;
}
/*
* Attempt to reserve the needed realtime extents by decrementing
* the number needed from the number available. This will
* fail if the count would go below zero.
*/
if (rtextents > 0) {
error = xfs_mod_frextents(mp, -((int64_t)rtextents));
if (error) {
error = -ENOSPC;
goto undo_log;
}
tp->t_rtx_res += rtextents;
}
return 0;
/*
* Error cases jump to one of these labels to undo any
* reservations which have already been performed.
*/
undo_log:
if (resp->tr_logres > 0) {
xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
tp->t_ticket = NULL;
tp->t_log_res = 0;
tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
}
undo_blocks:
if (blocks > 0) {
xfs_mod_fdblocks(mp, (int64_t)blocks, rsvd);
tp->t_blk_res = 0;
}
return error;
}
int
xfs_trans_alloc(
struct xfs_mount *mp,
struct xfs_trans_res *resp,
uint blocks,
uint rtextents,
uint flags,
struct xfs_trans **tpp)
{
struct xfs_trans *tp;
bool want_retry = true;
int error;
/*
* Allocate the handle before we do our freeze accounting and setting up
* GFP_NOFS allocation context so that we avoid lockdep false positives
* by doing GFP_KERNEL allocations inside sb_start_intwrite().
*/
retry:
tp = kmem_cache_zalloc(xfs_trans_cache, GFP_KERNEL | __GFP_NOFAIL);
if (!(flags & XFS_TRANS_NO_WRITECOUNT))
sb_start_intwrite(mp->m_super);
xfs_trans_set_context(tp);
/*
* Zero-reservation ("empty") transactions can't modify anything, so
* they're allowed to run while we're frozen.
*/
WARN_ON(resp->tr_logres > 0 &&
mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
ASSERT(!(flags & XFS_TRANS_RES_FDBLKS) ||
xfs_has_lazysbcount(mp));
tp->t_magic = XFS_TRANS_HEADER_MAGIC;
tp->t_flags = flags;
tp->t_mountp = mp;
INIT_LIST_HEAD(&tp->t_items);
INIT_LIST_HEAD(&tp->t_busy);
INIT_LIST_HEAD(&tp->t_dfops);
tp->t_firstblock = NULLFSBLOCK;
error = xfs_trans_reserve(tp, resp, blocks, rtextents);
if (error == -ENOSPC && want_retry) {
xfs_trans_cancel(tp);
/*
* We weren't able to reserve enough space for the transaction.
* Flush the other speculative space allocations to free space.
* Do not perform a synchronous scan because callers can hold
* other locks.
*/
xfs_blockgc_flush_all(mp);
want_retry = false;
goto retry;
}
if (error) {
xfs_trans_cancel(tp);
return error;
}
trace_xfs_trans_alloc(tp, _RET_IP_);
*tpp = tp;
return 0;
}
/*
* Create an empty transaction with no reservation. This is a defensive
* mechanism for routines that query metadata without actually modifying them --
* if the metadata being queried is somehow cross-linked (think a btree block
* pointer that points higher in the tree), we risk deadlock. However, blocks
* grabbed as part of a transaction can be re-grabbed. The verifiers will
* notice the corrupt block and the operation will fail back to userspace
* without deadlocking.
*
* Note the zero-length reservation; this transaction MUST be cancelled without
* any dirty data.
*
* Callers should obtain freeze protection to avoid a conflict with fs freezing
* where we can be grabbing buffers at the same time that freeze is trying to
* drain the buffer LRU list.
*/
int
xfs_trans_alloc_empty(
struct xfs_mount *mp,
struct xfs_trans **tpp)
{
struct xfs_trans_res resv = {0};
return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
}
/*
* Record the indicated change to the given field for application
* to the file system's superblock when the transaction commits.
* For now, just store the change in the transaction structure.
*
* Mark the transaction structure to indicate that the superblock
* needs to be updated before committing.
*
* Because we may not be keeping track of allocated/free inodes and
* used filesystem blocks in the superblock, we do not mark the
* superblock dirty in this transaction if we modify these fields.
* We still need to update the transaction deltas so that they get
* applied to the incore superblock, but we don't want them to
* cause the superblock to get locked and logged if these are the
* only fields in the superblock that the transaction modifies.
*/
void
xfs_trans_mod_sb(
xfs_trans_t *tp,
uint field,
int64_t delta)
{
uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
xfs_mount_t *mp = tp->t_mountp;
switch (field) {
case XFS_TRANS_SB_ICOUNT:
tp->t_icount_delta += delta;
if (xfs_has_lazysbcount(mp))
flags &= ~XFS_TRANS_SB_DIRTY;
break;
case XFS_TRANS_SB_IFREE:
tp->t_ifree_delta += delta;
if (xfs_has_lazysbcount(mp))
flags &= ~XFS_TRANS_SB_DIRTY;
break;
case XFS_TRANS_SB_FDBLOCKS:
/*
* Track the number of blocks allocated in the transaction.
* Make sure it does not exceed the number reserved. If so,
* shutdown as this can lead to accounting inconsistency.
*/
if (delta < 0) {
tp->t_blk_res_used += (uint)-delta;
if (tp->t_blk_res_used > tp->t_blk_res)
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
} else if (delta > 0 && (tp->t_flags & XFS_TRANS_RES_FDBLKS)) {
int64_t blkres_delta;
/*
* Return freed blocks directly to the reservation
* instead of the global pool, being careful not to
* overflow the trans counter. This is used to preserve
* reservation across chains of transaction rolls that
* repeatedly free and allocate blocks.
*/
blkres_delta = min_t(int64_t, delta,
UINT_MAX - tp->t_blk_res);
tp->t_blk_res += blkres_delta;
delta -= blkres_delta;
}
tp->t_fdblocks_delta += delta;
if (xfs_has_lazysbcount(mp))
flags &= ~XFS_TRANS_SB_DIRTY;
break;
case XFS_TRANS_SB_RES_FDBLOCKS:
/*
* The allocation has already been applied to the
* in-core superblock's counter. This should only
* be applied to the on-disk superblock.
*/
tp->t_res_fdblocks_delta += delta;
if (xfs_has_lazysbcount(mp))
flags &= ~XFS_TRANS_SB_DIRTY;
break;
case XFS_TRANS_SB_FREXTENTS:
/*
* Track the number of blocks allocated in the
* transaction. Make sure it does not exceed the
* number reserved.
*/
if (delta < 0) {
tp->t_rtx_res_used += (uint)-delta;
ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
}
tp->t_frextents_delta += delta;
break;
case XFS_TRANS_SB_RES_FREXTENTS:
/*
* The allocation has already been applied to the
* in-core superblock's counter. This should only
* be applied to the on-disk superblock.
*/
ASSERT(delta < 0);
tp->t_res_frextents_delta += delta;
break;
case XFS_TRANS_SB_DBLOCKS:
tp->t_dblocks_delta += delta;
break;
case XFS_TRANS_SB_AGCOUNT:
ASSERT(delta > 0);
tp->t_agcount_delta += delta;
break;
case XFS_TRANS_SB_IMAXPCT:
tp->t_imaxpct_delta += delta;
break;
case XFS_TRANS_SB_REXTSIZE:
tp->t_rextsize_delta += delta;
break;
case XFS_TRANS_SB_RBMBLOCKS:
tp->t_rbmblocks_delta += delta;
break;
case XFS_TRANS_SB_RBLOCKS:
tp->t_rblocks_delta += delta;
break;
case XFS_TRANS_SB_REXTENTS:
tp->t_rextents_delta += delta;
break;
case XFS_TRANS_SB_REXTSLOG:
tp->t_rextslog_delta += delta;
break;
default:
ASSERT(0);
return;
}
tp->t_flags |= flags;
}
/*
* xfs_trans_apply_sb_deltas() is called from the commit code
* to bring the superblock buffer into the current transaction
* and modify it as requested by earlier calls to xfs_trans_mod_sb().
*
* For now we just look at each field allowed to change and change
* it if necessary.
*/
STATIC void
xfs_trans_apply_sb_deltas(
xfs_trans_t *tp)
{
struct xfs_dsb *sbp;
struct xfs_buf *bp;
int whole = 0;
bp = xfs_trans_getsb(tp);
sbp = bp->b_addr;
/*
* Only update the superblock counters if we are logging them
*/
if (!xfs_has_lazysbcount((tp->t_mountp))) {
if (tp->t_icount_delta)
be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
if (tp->t_ifree_delta)
be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
if (tp->t_fdblocks_delta)
be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
if (tp->t_res_fdblocks_delta)
be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
}
/*
* Updating frextents requires careful handling because it does not
* behave like the lazysb counters because we cannot rely on log
* recovery in older kenels to recompute the value from the rtbitmap.
* This means that the ondisk frextents must be consistent with the
* rtbitmap.
*
* Therefore, log the frextents change to the ondisk superblock and
* update the incore superblock so that future calls to xfs_log_sb
* write the correct value ondisk.
*
* Don't touch m_frextents because it includes incore reservations,
* and those are handled by the unreserve function.
*/
if (tp->t_frextents_delta || tp->t_res_frextents_delta) {
struct xfs_mount *mp = tp->t_mountp;
int64_t rtxdelta;
rtxdelta = tp->t_frextents_delta + tp->t_res_frextents_delta;
spin_lock(&mp->m_sb_lock);
be64_add_cpu(&sbp->sb_frextents, rtxdelta);
mp->m_sb.sb_frextents += rtxdelta;
spin_unlock(&mp->m_sb_lock);
}
if (tp->t_dblocks_delta) {
be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
whole = 1;
}
if (tp->t_agcount_delta) {
be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
whole = 1;
}
if (tp->t_imaxpct_delta) {
sbp->sb_imax_pct += tp->t_imaxpct_delta;
whole = 1;
}
if (tp->t_rextsize_delta) {
be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
whole = 1;
}
if (tp->t_rbmblocks_delta) {
be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
whole = 1;
}
if (tp->t_rblocks_delta) {
be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
whole = 1;
}
if (tp->t_rextents_delta) {
be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
whole = 1;
}
if (tp->t_rextslog_delta) {
sbp->sb_rextslog += tp->t_rextslog_delta;
whole = 1;
}
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
if (whole)
/*
* Log the whole thing, the fields are noncontiguous.
*/
xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1);
else
/*
* Since all the modifiable fields are contiguous, we
* can get away with this.
*/
xfs_trans_log_buf(tp, bp, offsetof(struct xfs_dsb, sb_icount),
offsetof(struct xfs_dsb, sb_frextents) +
sizeof(sbp->sb_frextents) - 1);
}
/*
* xfs_trans_unreserve_and_mod_sb() is called to release unused reservations and
* apply superblock counter changes to the in-core superblock. The
* t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
* applied to the in-core superblock. The idea is that that has already been
* done.
*
* If we are not logging superblock counters, then the inode allocated/free and
* used block counts are not updated in the on disk superblock. In this case,
* XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
* still need to update the incore superblock with the changes.
*
* Deltas for the inode count are +/-64, hence we use a large batch size of 128
* so we don't need to take the counter lock on every update.
*/
#define XFS_ICOUNT_BATCH 128
void
xfs_trans_unreserve_and_mod_sb(
struct xfs_trans *tp)
{
struct xfs_mount *mp = tp->t_mountp;
bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
int64_t blkdelta = 0;
int64_t rtxdelta = 0;
int64_t idelta = 0;
int64_t ifreedelta = 0;
int error;
/* calculate deltas */
if (tp->t_blk_res > 0)
blkdelta = tp->t_blk_res;
if ((tp->t_fdblocks_delta != 0) &&
(xfs_has_lazysbcount(mp) ||
(tp->t_flags & XFS_TRANS_SB_DIRTY)))
blkdelta += tp->t_fdblocks_delta;
if (tp->t_rtx_res > 0)
rtxdelta = tp->t_rtx_res;
if ((tp->t_frextents_delta != 0) &&
(tp->t_flags & XFS_TRANS_SB_DIRTY))
rtxdelta += tp->t_frextents_delta;
if (xfs_has_lazysbcount(mp) ||
(tp->t_flags & XFS_TRANS_SB_DIRTY)) {
idelta = tp->t_icount_delta;
ifreedelta = tp->t_ifree_delta;
}
/* apply the per-cpu counters */
if (blkdelta) {
error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
ASSERT(!error);
}
if (idelta)
percpu_counter_add_batch(&mp->m_icount, idelta,
XFS_ICOUNT_BATCH);
if (ifreedelta)
percpu_counter_add(&mp->m_ifree, ifreedelta);
if (rtxdelta) {
error = xfs_mod_frextents(mp, rtxdelta);
ASSERT(!error);
}
if (!(tp->t_flags & XFS_TRANS_SB_DIRTY))
return;
/* apply remaining deltas */
spin_lock(&mp->m_sb_lock);
mp->m_sb.sb_fdblocks += tp->t_fdblocks_delta + tp->t_res_fdblocks_delta;
mp->m_sb.sb_icount += idelta;
mp->m_sb.sb_ifree += ifreedelta;
/*
* Do not touch sb_frextents here because we are dealing with incore
* reservation. sb_frextents is not part of the lazy sb counters so it
* must be consistent with the ondisk rtbitmap and must never include
* incore reservations.
*/
mp->m_sb.sb_dblocks += tp->t_dblocks_delta;
mp->m_sb.sb_agcount += tp->t_agcount_delta;
mp->m_sb.sb_imax_pct += tp->t_imaxpct_delta;
mp->m_sb.sb_rextsize += tp->t_rextsize_delta;
mp->m_sb.sb_rbmblocks += tp->t_rbmblocks_delta;
mp->m_sb.sb_rblocks += tp->t_rblocks_delta;
mp->m_sb.sb_rextents += tp->t_rextents_delta;
mp->m_sb.sb_rextslog += tp->t_rextslog_delta;
spin_unlock(&mp->m_sb_lock);
/*
* Debug checks outside of the spinlock so they don't lock up the
* machine if they fail.
*/
ASSERT(mp->m_sb.sb_imax_pct >= 0);
ASSERT(mp->m_sb.sb_rextslog >= 0);
return;
}
/* Add the given log item to the transaction's list of log items. */
void
xfs_trans_add_item(
struct xfs_trans *tp,
struct xfs_log_item *lip)
{
ASSERT(lip->li_log == tp->t_mountp->m_log);
ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
ASSERT(list_empty(&lip->li_trans));
ASSERT(!test_bit(XFS_LI_DIRTY, &lip->li_flags));
list_add_tail(&lip->li_trans, &tp->t_items);
trace_xfs_trans_add_item(tp, _RET_IP_);
}
/*
* Unlink the log item from the transaction. the log item is no longer
* considered dirty in this transaction, as the linked transaction has
* finished, either by abort or commit completion.
*/
void
xfs_trans_del_item(
struct xfs_log_item *lip)
{
clear_bit(XFS_LI_DIRTY, &lip->li_flags);
list_del_init(&lip->li_trans);
}
/* Detach and unlock all of the items in a transaction */
static void
xfs_trans_free_items(
struct xfs_trans *tp,
bool abort)
{
struct xfs_log_item *lip, *next;
trace_xfs_trans_free_items(tp, _RET_IP_);
list_for_each_entry_safe(lip, next, &tp->t_items, li_trans) {
xfs_trans_del_item(lip);
if (abort)
set_bit(XFS_LI_ABORTED, &lip->li_flags);
if (lip->li_ops->iop_release)
lip->li_ops->iop_release(lip);
}
}
static inline void
xfs_log_item_batch_insert(
struct xfs_ail *ailp,
struct xfs_ail_cursor *cur,
struct xfs_log_item **log_items,
int nr_items,
xfs_lsn_t commit_lsn)
{
int i;
spin_lock(&ailp->ail_lock);
/* xfs_trans_ail_update_bulk drops ailp->ail_lock */
xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
for (i = 0; i < nr_items; i++) {
struct xfs_log_item *lip = log_items[i];
if (lip->li_ops->iop_unpin)
lip->li_ops->iop_unpin(lip, 0);
}
}
/*
* Bulk operation version of xfs_trans_committed that takes a log vector of
* items to insert into the AIL. This uses bulk AIL insertion techniques to
* minimise lock traffic.
*
* If we are called with the aborted flag set, it is because a log write during
* a CIL checkpoint commit has failed. In this case, all the items in the
* checkpoint have already gone through iop_committed and iop_committing, which
* means that checkpoint commit abort handling is treated exactly the same
* as an iclog write error even though we haven't started any IO yet. Hence in
* this case all we need to do is iop_committed processing, followed by an
* iop_unpin(aborted) call.
*
* The AIL cursor is used to optimise the insert process. If commit_lsn is not
* at the end of the AIL, the insert cursor avoids the need to walk
* the AIL to find the insertion point on every xfs_log_item_batch_insert()
* call. This saves a lot of needless list walking and is a net win, even
* though it slightly increases that amount of AIL lock traffic to set it up
* and tear it down.
*/
void
xfs_trans_committed_bulk(
struct xfs_ail *ailp,
struct list_head *lv_chain,
xfs_lsn_t commit_lsn,
bool aborted)
{
#define LOG_ITEM_BATCH_SIZE 32
struct xfs_log_item *log_items[LOG_ITEM_BATCH_SIZE];
struct xfs_log_vec *lv;
struct xfs_ail_cursor cur;
int i = 0;
spin_lock(&ailp->ail_lock);
xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
spin_unlock(&ailp->ail_lock);
/* unpin all the log items */
list_for_each_entry(lv, lv_chain, lv_list) {
struct xfs_log_item *lip = lv->lv_item;
xfs_lsn_t item_lsn;
if (aborted)
set_bit(XFS_LI_ABORTED, &lip->li_flags);
if (lip->li_ops->flags & XFS_ITEM_RELEASE_WHEN_COMMITTED) {
lip->li_ops->iop_release(lip);
continue;
}
if (lip->li_ops->iop_committed)
item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
else
item_lsn = commit_lsn;
/* item_lsn of -1 means the item needs no further processing */
if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
continue;
/*
* if we are aborting the operation, no point in inserting the
* object into the AIL as we are in a shutdown situation.
*/
if (aborted) {
ASSERT(xlog_is_shutdown(ailp->ail_log));
if (lip->li_ops->iop_unpin)
lip->li_ops->iop_unpin(lip, 1);
continue;
}
if (item_lsn != commit_lsn) {
/*
* Not a bulk update option due to unusual item_lsn.
* Push into AIL immediately, rechecking the lsn once
* we have the ail lock. Then unpin the item. This does
* not affect the AIL cursor the bulk insert path is
* using.
*/
spin_lock(&ailp->ail_lock);
if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
xfs_trans_ail_update(ailp, lip, item_lsn);
else
spin_unlock(&ailp->ail_lock);
if (lip->li_ops->iop_unpin)
lip->li_ops->iop_unpin(lip, 0);
continue;
}
/* Item is a candidate for bulk AIL insert. */
log_items[i++] = lv->lv_item;
if (i >= LOG_ITEM_BATCH_SIZE) {
xfs_log_item_batch_insert(ailp, &cur, log_items,
LOG_ITEM_BATCH_SIZE, commit_lsn);
i = 0;
}
}
/* make sure we insert the remainder! */
if (i)
xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
spin_lock(&ailp->ail_lock);
xfs_trans_ail_cursor_done(&cur);
spin_unlock(&ailp->ail_lock);
}
/*
* Sort transaction items prior to running precommit operations. This will
* attempt to order the items such that they will always be locked in the same
* order. Items that have no sort function are moved to the end of the list
* and so are locked last.
*
* This may need refinement as different types of objects add sort functions.
*
* Function is more complex than it needs to be because we are comparing 64 bit
* values and the function only returns 32 bit values.
*/
static int
xfs_trans_precommit_sort(
void *unused_arg,
const struct list_head *a,
const struct list_head *b)
{
struct xfs_log_item *lia = container_of(a,
struct xfs_log_item, li_trans);
struct xfs_log_item *lib = container_of(b,
struct xfs_log_item, li_trans);
int64_t diff;
/*
* If both items are non-sortable, leave them alone. If only one is
* sortable, move the non-sortable item towards the end of the list.
*/
if (!lia->li_ops->iop_sort && !lib->li_ops->iop_sort)
return 0;
if (!lia->li_ops->iop_sort)
return 1;
if (!lib->li_ops->iop_sort)
return -1;
diff = lia->li_ops->iop_sort(lia) - lib->li_ops->iop_sort(lib);
if (diff < 0)
return -1;
if (diff > 0)
return 1;
return 0;
}
/*
* Run transaction precommit functions.
*
* If there is an error in any of the callouts, then stop immediately and
* trigger a shutdown to abort the transaction. There is no recovery possible
* from errors at this point as the transaction is dirty....
*/
static int
xfs_trans_run_precommits(
struct xfs_trans *tp)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_log_item *lip, *n;
int error = 0;
/*
* Sort the item list to avoid ABBA deadlocks with other transactions
* running precommit operations that lock multiple shared items such as
* inode cluster buffers.
*/
list_sort(NULL, &tp->t_items, xfs_trans_precommit_sort);
/*
* Precommit operations can remove the log item from the transaction
* if the log item exists purely to delay modifications until they
* can be ordered against other operations. Hence we have to use
* list_for_each_entry_safe() here.
*/
list_for_each_entry_safe(lip, n, &tp->t_items, li_trans) {
if (!test_bit(XFS_LI_DIRTY, &lip->li_flags))
continue;
if (lip->li_ops->iop_precommit) {
error = lip->li_ops->iop_precommit(tp, lip);
if (error)
break;
}
}
if (error)
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
return error;
}
/*
* Commit the given transaction to the log.
*
* XFS disk error handling mechanism is not based on a typical
* transaction abort mechanism. Logically after the filesystem
* gets marked 'SHUTDOWN', we can't let any new transactions
* be durable - ie. committed to disk - because some metadata might
* be inconsistent. In such cases, this returns an error, and the
* caller may assume that all locked objects joined to the transaction
* have already been unlocked as if the commit had succeeded.
* Do not reference the transaction structure after this call.
*/
static int
__xfs_trans_commit(
struct xfs_trans *tp,
bool regrant)
{
struct xfs_mount *mp = tp->t_mountp;
struct xlog *log = mp->m_log;
xfs_csn_t commit_seq = 0;
int error = 0;
int sync = tp->t_flags & XFS_TRANS_SYNC;
trace_xfs_trans_commit(tp, _RET_IP_);
error = xfs_trans_run_precommits(tp);
if (error) {
if (tp->t_flags & XFS_TRANS_PERM_LOG_RES)
xfs_defer_cancel(tp);
goto out_unreserve;
}
/*
* Finish deferred items on final commit. Only permanent transactions
* should ever have deferred ops.
*/
WARN_ON_ONCE(!list_empty(&tp->t_dfops) &&
!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
if (!regrant && (tp->t_flags & XFS_TRANS_PERM_LOG_RES)) {
error = xfs_defer_finish_noroll(&tp);
if (error)
goto out_unreserve;
}
/*
* If there is nothing to be logged by the transaction,
* then unlock all of the items associated with the
* transaction and free the transaction structure.
* Also make sure to return any reserved blocks to
* the free pool.
*/
if (!(tp->t_flags & XFS_TRANS_DIRTY))
goto out_unreserve;
/*
* We must check against log shutdown here because we cannot abort log
* items and leave them dirty, inconsistent and unpinned in memory while
* the log is active. This leaves them open to being written back to
* disk, and that will lead to on-disk corruption.
*/
if (xlog_is_shutdown(log)) {
error = -EIO;
goto out_unreserve;
}
ASSERT(tp->t_ticket != NULL);
/*
* If we need to update the superblock, then do it now.
*/
if (tp->t_flags & XFS_TRANS_SB_DIRTY)
xfs_trans_apply_sb_deltas(tp);
xfs_trans_apply_dquot_deltas(tp);
xlog_cil_commit(log, tp, &commit_seq, regrant);
xfs_trans_free(tp);
/*
* If the transaction needs to be synchronous, then force the
* log out now and wait for it.
*/
if (sync) {
error = xfs_log_force_seq(mp, commit_seq, XFS_LOG_SYNC, NULL);
XFS_STATS_INC(mp, xs_trans_sync);
} else {
XFS_STATS_INC(mp, xs_trans_async);
}
return error;
out_unreserve:
xfs_trans_unreserve_and_mod_sb(tp);
/*
* It is indeed possible for the transaction to be not dirty but
* the dqinfo portion to be. All that means is that we have some
* (non-persistent) quota reservations that need to be unreserved.
*/
xfs_trans_unreserve_and_mod_dquots(tp);
if (tp->t_ticket) {
if (regrant && !xlog_is_shutdown(log))
xfs_log_ticket_regrant(log, tp->t_ticket);
else
xfs_log_ticket_ungrant(log, tp->t_ticket);
tp->t_ticket = NULL;
}
xfs_trans_free_items(tp, !!error);
xfs_trans_free(tp);
XFS_STATS_INC(mp, xs_trans_empty);
return error;
}
int
xfs_trans_commit(
struct xfs_trans *tp)
{
return __xfs_trans_commit(tp, false);
}
/*
* Unlock all of the transaction's items and free the transaction. If the
* transaction is dirty, we must shut down the filesystem because there is no
* way to restore them to their previous state.
*
* If the transaction has made a log reservation, make sure to release it as
* well.
*
* This is a high level function (equivalent to xfs_trans_commit()) and so can
* be called after the transaction has effectively been aborted due to the mount
* being shut down. However, if the mount has not been shut down and the
* transaction is dirty we will shut the mount down and, in doing so, that
* guarantees that the log is shut down, too. Hence we don't need to be as
* careful with shutdown state and dirty items here as we need to be in
* xfs_trans_commit().
*/
void
xfs_trans_cancel(
struct xfs_trans *tp)
{
struct xfs_mount *mp = tp->t_mountp;
struct xlog *log = mp->m_log;
bool dirty = (tp->t_flags & XFS_TRANS_DIRTY);
trace_xfs_trans_cancel(tp, _RET_IP_);
/*
* It's never valid to cancel a transaction with deferred ops attached,
* because the transaction is effectively dirty. Complain about this
* loudly before freeing the in-memory defer items.
*/
if (!list_empty(&tp->t_dfops)) {
ASSERT(xfs_is_shutdown(mp) || list_empty(&tp->t_dfops));
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
dirty = true;
xfs_defer_cancel(tp);
}
/*
* See if the caller is relying on us to shut down the filesystem. We
* only want an error report if there isn't already a shutdown in
* progress, so we only need to check against the mount shutdown state
* here.
*/
if (dirty && !xfs_is_shutdown(mp)) {
XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
}
#ifdef DEBUG
/* Log items need to be consistent until the log is shut down. */
if (!dirty && !xlog_is_shutdown(log)) {
struct xfs_log_item *lip;
list_for_each_entry(lip, &tp->t_items, li_trans)
ASSERT(!xlog_item_is_intent_done(lip));
}
#endif
xfs_trans_unreserve_and_mod_sb(tp);
xfs_trans_unreserve_and_mod_dquots(tp);
if (tp->t_ticket) {
xfs_log_ticket_ungrant(log, tp->t_ticket);
tp->t_ticket = NULL;
}
xfs_trans_free_items(tp, dirty);
xfs_trans_free(tp);
}
/*
* Roll from one trans in the sequence of PERMANENT transactions to
* the next: permanent transactions are only flushed out when
* committed with xfs_trans_commit(), but we still want as soon
* as possible to let chunks of it go to the log. So we commit the
* chunk we've been working on and get a new transaction to continue.
*/
int
xfs_trans_roll(
struct xfs_trans **tpp)
{
struct xfs_trans *trans = *tpp;
struct xfs_trans_res tres;
int error;
trace_xfs_trans_roll(trans, _RET_IP_);
/*
* Copy the critical parameters from one trans to the next.
*/
tres.tr_logres = trans->t_log_res;
tres.tr_logcount = trans->t_log_count;
*tpp = xfs_trans_dup(trans);
/*
* Commit the current transaction.
* If this commit failed, then it'd just unlock those items that
* are not marked ihold. That also means that a filesystem shutdown
* is in progress. The caller takes the responsibility to cancel
* the duplicate transaction that gets returned.
*/
error = __xfs_trans_commit(trans, true);
if (error)
return error;
/*
* Reserve space in the log for the next transaction.
* This also pushes items in the "AIL", the list of logged items,
* out to disk if they are taking up space at the tail of the log
* that we want to use. This requires that either nothing be locked
* across this call, or that anything that is locked be logged in
* the prior and the next transactions.
*/
tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
return xfs_trans_reserve(*tpp, &tres, 0, 0);
}
/*
* Allocate an transaction, lock and join the inode to it, and reserve quota.
*
* The caller must ensure that the on-disk dquots attached to this inode have
* already been allocated and initialized. The caller is responsible for
* releasing ILOCK_EXCL if a new transaction is returned.
*/
int
xfs_trans_alloc_inode(
struct xfs_inode *ip,
struct xfs_trans_res *resv,
unsigned int dblocks,
unsigned int rblocks,
bool force,
struct xfs_trans **tpp)
{
struct xfs_trans *tp;
struct xfs_mount *mp = ip->i_mount;
bool retried = false;
int error;
retry:
error = xfs_trans_alloc(mp, resv, dblocks,
rblocks / mp->m_sb.sb_rextsize,
force ? XFS_TRANS_RESERVE : 0, &tp);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, 0);
error = xfs_qm_dqattach_locked(ip, false);
if (error) {
/* Caller should have allocated the dquots! */
ASSERT(error != -ENOENT);
goto out_cancel;
}
error = xfs_trans_reserve_quota_nblks(tp, ip, dblocks, rblocks, force);
if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
xfs_blockgc_free_quota(ip, 0);
retried = true;
goto retry;
}
if (error)
goto out_cancel;
*tpp = tp;
return 0;
out_cancel:
xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
/*
* Allocate an transaction in preparation for inode creation by reserving quota
* against the given dquots. Callers are not required to hold any inode locks.
*/
int
xfs_trans_alloc_icreate(
struct xfs_mount *mp,
struct xfs_trans_res *resv,
struct xfs_dquot *udqp,
struct xfs_dquot *gdqp,
struct xfs_dquot *pdqp,
unsigned int dblocks,
struct xfs_trans **tpp)
{
struct xfs_trans *tp;
bool retried = false;
int error;
retry:
error = xfs_trans_alloc(mp, resv, dblocks, 0, 0, &tp);
if (error)
return error;
error = xfs_trans_reserve_quota_icreate(tp, udqp, gdqp, pdqp, dblocks);
if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
xfs_trans_cancel(tp);
xfs_blockgc_free_dquots(mp, udqp, gdqp, pdqp, 0);
retried = true;
goto retry;
}
if (error) {
xfs_trans_cancel(tp);
return error;
}
*tpp = tp;
return 0;
}
/*
* Allocate an transaction, lock and join the inode to it, and reserve quota
* in preparation for inode attribute changes that include uid, gid, or prid
* changes.
*
* The caller must ensure that the on-disk dquots attached to this inode have
* already been allocated and initialized. The ILOCK will be dropped when the
* transaction is committed or cancelled.
*/
int
xfs_trans_alloc_ichange(
struct xfs_inode *ip,
struct xfs_dquot *new_udqp,
struct xfs_dquot *new_gdqp,
struct xfs_dquot *new_pdqp,
bool force,
struct xfs_trans **tpp)
{
struct xfs_trans *tp;
struct xfs_mount *mp = ip->i_mount;
struct xfs_dquot *udqp;
struct xfs_dquot *gdqp;
struct xfs_dquot *pdqp;
bool retried = false;
int error;
retry:
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
error = xfs_qm_dqattach_locked(ip, false);
if (error) {
/* Caller should have allocated the dquots! */
ASSERT(error != -ENOENT);
goto out_cancel;
}
/*
* For each quota type, skip quota reservations if the inode's dquots
* now match the ones that came from the caller, or the caller didn't
* pass one in. The inode's dquots can change if we drop the ILOCK to
* perform a blockgc scan, so we must preserve the caller's arguments.
*/
udqp = (new_udqp != ip->i_udquot) ? new_udqp : NULL;
gdqp = (new_gdqp != ip->i_gdquot) ? new_gdqp : NULL;
pdqp = (new_pdqp != ip->i_pdquot) ? new_pdqp : NULL;
if (udqp || gdqp || pdqp) {
unsigned int qflags = XFS_QMOPT_RES_REGBLKS;
if (force)
qflags |= XFS_QMOPT_FORCE_RES;
/*
* Reserve enough quota to handle blocks on disk and reserved
* for a delayed allocation. We'll actually transfer the
* delalloc reservation between dquots at chown time, even
* though that part is only semi-transactional.
*/
error = xfs_trans_reserve_quota_bydquots(tp, mp, udqp, gdqp,
pdqp, ip->i_nblocks + ip->i_delayed_blks,
1, qflags);
if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
xfs_trans_cancel(tp);
xfs_blockgc_free_dquots(mp, udqp, gdqp, pdqp, 0);
retried = true;
goto retry;
}
if (error)
goto out_cancel;
}
*tpp = tp;
return 0;
out_cancel:
xfs_trans_cancel(tp);
return error;
}
/*
* Allocate an transaction, lock and join the directory and child inodes to it,
* and reserve quota for a directory update. If there isn't sufficient space,
* @dblocks will be set to zero for a reservationless directory update and
* @nospace_error will be set to a negative errno describing the space
* constraint we hit.
*
* The caller must ensure that the on-disk dquots attached to this inode have
* already been allocated and initialized. The ILOCKs will be dropped when the
* transaction is committed or cancelled.
*/
int
xfs_trans_alloc_dir(
struct xfs_inode *dp,
struct xfs_trans_res *resv,
struct xfs_inode *ip,
unsigned int *dblocks,
struct xfs_trans **tpp,
int *nospace_error)
{
struct xfs_trans *tp;
struct xfs_mount *mp = ip->i_mount;
unsigned int resblks;
bool retried = false;
int error;
retry:
*nospace_error = 0;
resblks = *dblocks;
error = xfs_trans_alloc(mp, resv, resblks, 0, 0, &tp);
if (error == -ENOSPC) {
*nospace_error = error;
resblks = 0;
error = xfs_trans_alloc(mp, resv, resblks, 0, 0, &tp);
}
if (error)
return error;
xfs_lock_two_inodes(dp, XFS_ILOCK_EXCL, ip, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
error = xfs_qm_dqattach_locked(dp, false);
if (error) {
/* Caller should have allocated the dquots! */
ASSERT(error != -ENOENT);
goto out_cancel;
}
error = xfs_qm_dqattach_locked(ip, false);
if (error) {
/* Caller should have allocated the dquots! */
ASSERT(error != -ENOENT);
goto out_cancel;
}
if (resblks == 0)
goto done;
error = xfs_trans_reserve_quota_nblks(tp, dp, resblks, 0, false);
if (error == -EDQUOT || error == -ENOSPC) {
if (!retried) {
xfs_trans_cancel(tp);
xfs_blockgc_free_quota(dp, 0);
retried = true;
goto retry;
}
*nospace_error = error;
resblks = 0;
error = 0;
}
if (error)
goto out_cancel;
done:
*tpp = tp;
*dblocks = resblks;
return 0;
out_cancel:
xfs_trans_cancel(tp);
return error;
}
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