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xfs: don't bounce the iolock between free_{eof,cow}blocks

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Since xfs_inode_free_eofblocks and xfs_inode_free_cowblocks are now
internal static functions, we can save ourselves a cycling of the iolock
by passing the lock state out to xfs_blockgc_scan_inode and letting it
do all the unlocking.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2021-01-25 21:09:49 -08:00
parent 47bd6d3457
commit 0fa4a10a2f
1 changed files with 21 additions and 22 deletions
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43
fs/xfs/xfs_icache.c
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@ -1283,11 +1283,11 @@ xfs_reclaim_worker(
STATIC int
xfs_inode_free_eofblocks(
struct xfs_inode *ip,
void *args)
void *args,
unsigned int *lockflags)
{
struct xfs_eofblocks *eofb = args;
bool wait;
int ret;
wait = eofb && (eofb->eof_flags & XFS_EOF_FLAGS_SYNC);
@ -1320,11 +1320,9 @@ xfs_inode_free_eofblocks(
return -EAGAIN;
return 0;
}
*lockflags |= XFS_IOLOCK_EXCL;
ret = xfs_free_eofblocks(ip);
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return ret;
return xfs_free_eofblocks(ip);
}
/*
@ -1493,7 +1491,8 @@ xfs_prep_free_cowblocks(
STATIC int
xfs_inode_free_cowblocks(
struct xfs_inode *ip,
void *args)
void *args,
unsigned int *lockflags)
{
struct xfs_eofblocks *eofb = args;
bool wait;
@ -1514,16 +1513,20 @@ xfs_inode_free_cowblocks(
* If the caller is waiting, return -EAGAIN to keep the background
* scanner moving and revisit the inode in a subsequent pass.
*/
if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
if (!(*lockflags & XFS_IOLOCK_EXCL) &&
!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
if (wait)
return -EAGAIN;
return 0;
}
*lockflags |= XFS_IOLOCK_EXCL;
if (!xfs_ilock_nowait(ip, XFS_MMAPLOCK_EXCL)) {
if (wait)
ret = -EAGAIN;
goto out_iolock;
return -EAGAIN;
return 0;
}
*lockflags |= XFS_MMAPLOCK_EXCL;
/*
* Check again, nobody else should be able to dirty blocks or change
@ -1531,11 +1534,6 @@ xfs_inode_free_cowblocks(
*/
if (xfs_prep_free_cowblocks(ip))
ret = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, false);
xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
out_iolock:
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
return ret;
}
@ -1593,17 +1591,18 @@ xfs_blockgc_scan_inode(
struct xfs_inode *ip,
void *args)
{
unsigned int lockflags = 0;
int error;
error = xfs_inode_free_eofblocks(ip, args);
error = xfs_inode_free_eofblocks(ip, args, &lockflags);
if (error)
return error;
goto unlock;
error = xfs_inode_free_cowblocks(ip, args);
if (error)
return error;
return 0;
error = xfs_inode_free_cowblocks(ip, args, &lockflags);
unlock:
if (lockflags)
xfs_iunlock(ip, lockflags);
return error;
}
/* Background worker that trims preallocated space. */