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authorChristoph Hellwig <hch@infradead.org>2012-03-27 10:34:48 -0400
committerBen Myers <bpm@sgi.com>2012-05-14 16:20:18 -0500
commitf38996f5768713fb60e1d2de66c097367d54bb6a (patch)
tree42135e66d1a3e90aede209d491dec9304e36d703 /fs/xfs/xfs_iops.c
parent467f78992a0743e0e71729e4faa20b67b0f25289 (diff)
xfs: reduce ilock hold times in xfs_setattr_size
We do not need the ilock for most checks done in the beginning of xfs_setattr_size. Replace the long critical section before starting the transaction with a smaller one around xfs_zero_eof and an optional one inside xfs_qm_dqattach that isn't entered unless using quotas. While this isn't a big optimization for xfs_setattr_size itself it will allow pushing the ilock into xfs_zero_eof itself later. Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_iops.c')
-rw-r--r--fs/xfs/xfs_iops.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 3011b879f85..0a80543644c 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -700,7 +700,7 @@ xfs_setattr_size(
xfs_off_t oldsize, newsize;
struct xfs_trans *tp;
int error;
- uint lock_flags;
+ uint lock_flags = 0;
uint commit_flags = 0;
trace_xfs_setattr(ip);
@@ -720,10 +720,10 @@ xfs_setattr_size(
ATTR_MTIME_SET|ATTR_KILL_SUID|ATTR_KILL_SGID|
ATTR_KILL_PRIV|ATTR_TIMES_SET)) == 0);
- lock_flags = XFS_ILOCK_EXCL;
- if (!(flags & XFS_ATTR_NOLOCK))
+ if (!(flags & XFS_ATTR_NOLOCK)) {
lock_flags |= XFS_IOLOCK_EXCL;
- xfs_ilock(ip, lock_flags);
+ xfs_ilock(ip, lock_flags);
+ }
oldsize = inode->i_size;
newsize = iattr->ia_size;
@@ -746,7 +746,7 @@ xfs_setattr_size(
/*
* Make sure that the dquots are attached to the inode.
*/
- error = xfs_qm_dqattach_locked(ip, 0);
+ error = xfs_qm_dqattach(ip, 0);
if (error)
goto out_unlock;
@@ -764,12 +764,12 @@ xfs_setattr_size(
* before the inode is joined to the transaction to modify
* i_size.
*/
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_zero_eof(ip, newsize, oldsize);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
if (error)
goto out_unlock;
}
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- lock_flags &= ~XFS_ILOCK_EXCL;
/*
* We are going to log the inode size change in this transaction so