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| author | Christoph Hellwig <hch@infradead.org> | 2012-03-27 10:34:46 -0400 |
|---|---|---|
| committer | Ben Myers <bpm@sgi.com> | 2012-05-14 16:20:15 -0500 |
| commit | b4d05e3019692fc5a8c573fbce60de2d48c5b7a1 (patch) | |
| tree | df2c46061cc44055771475056962bc4c45a7b758 /fs/xfs/xfs_qm.c | |
| parent | 8a00ebe4cfc90eda9ecb575ba97e22021cd8cf70 (diff) | |
| download | linux-b4d05e3019692fc5a8c573fbce60de2d48c5b7a1.tar.gz linux-b4d05e3019692fc5a8c573fbce60de2d48c5b7a1.tar.bz2 linux-b4d05e3019692fc5a8c573fbce60de2d48c5b7a1.zip | |
xfs: avoid taking the ilock unnessecarily in xfs_qm_dqattach
Check if we actually need to attach a dquot before taking the ilock in
xfs_qm_dqattach. This avoid superflous lock roundtrips for the common cases
of quota support compiled in but not activated on a filesystem and an
inode that already has the dquots attached.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_qm.c')
| -rw-r--r-- | fs/xfs/xfs_qm.c | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c index 55c6afedc879..18ba438386ab 100644 --- a/fs/xfs/xfs_qm.c +++ b/fs/xfs/xfs_qm.c @@ -483,6 +483,23 @@ done: xfs_dqunlock(udq); } +static bool +xfs_qm_need_dqattach( + struct xfs_inode *ip) +{ + struct xfs_mount *mp = ip->i_mount; + + if (!XFS_IS_QUOTA_RUNNING(mp)) + return false; + if (!XFS_IS_QUOTA_ON(mp)) + return false; + if (!XFS_NOT_DQATTACHED(mp, ip)) + return false; + if (ip->i_ino == mp->m_sb.sb_uquotino || + ip->i_ino == mp->m_sb.sb_gquotino) + return false; + return true; +} /* * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON @@ -500,11 +517,7 @@ xfs_qm_dqattach_locked( uint nquotas = 0; int error = 0; - if (!XFS_IS_QUOTA_RUNNING(mp) || - !XFS_IS_QUOTA_ON(mp) || - !XFS_NOT_DQATTACHED(mp, ip) || - ip->i_ino == mp->m_sb.sb_uquotino || - ip->i_ino == mp->m_sb.sb_gquotino) + if (!xfs_qm_need_dqattach(ip)) return 0; ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); @@ -575,6 +588,9 @@ xfs_qm_dqattach( { int error; + if (!xfs_qm_need_dqattach(ip)) + return 0; + xfs_ilock(ip, XFS_ILOCK_EXCL); error = xfs_qm_dqattach_locked(ip, flags); xfs_iunlock(ip, XFS_ILOCK_EXCL); |