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| author | Christoph Hellwig <hch@infradead.org> | 2008-08-13 16:45:13 +1000 |
|---|---|---|
| committer | Lachlan McIlroy <lachlan@redback.melbourne.sgi.com> | 2008-08-13 16:45:13 +1000 |
| commit | 8e5975c82f66bce36955f38e9abc259d5143a72a (patch) | |
| tree | def4ae55c36f02f920037b769a268f389c5b513a /fs | |
| parent | dff35fd41f252476cba7f761d7204dd9f47d739e (diff) | |
| download | linux-8e5975c82f66bce36955f38e9abc259d5143a72a.tar.gz linux-8e5975c82f66bce36955f38e9abc259d5143a72a.tar.bz2 linux-8e5975c82f66bce36955f38e9abc259d5143a72a.zip | |
[XFS] optimize xfs_ichgtime
Port a little optmization from file_update_time to xfs_ichgtime, and only
update the timestamp and mark the inode dirty if the timestamp actually
changes in the timer tick resultion supported by the running kernel.
SGI-PV: 981498
SGI-Modid: xfs-linux-melb:xfs-kern:31827a
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_iops.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c index d6947f818f29..0e7ca2155956 100644 --- a/fs/xfs/linux-2.6/xfs_iops.c +++ b/fs/xfs/linux-2.6/xfs_iops.c @@ -97,17 +97,23 @@ xfs_ichgtime( { struct inode *inode = VFS_I(ip); timespec_t tv; + int sync_it = 0; - nanotime(&tv); - if (flags & XFS_ICHGTIME_MOD) { + tv = current_fs_time(inode->i_sb); + + if ((flags & XFS_ICHGTIME_MOD) && + !timespec_equal(&inode->i_mtime, &tv)) { inode->i_mtime = tv; ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec; ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec; + sync_it = 1; } - if (flags & XFS_ICHGTIME_CHG) { + if ((flags & XFS_ICHGTIME_CHG) && + !timespec_equal(&inode->i_ctime, &tv)) { inode->i_ctime = tv; ip->i_d.di_ctime.t_sec = (__int32_t)tv.tv_sec; ip->i_d.di_ctime.t_nsec = (__int32_t)tv.tv_nsec; + sync_it = 1; } /* @@ -119,10 +125,11 @@ xfs_ichgtime( * ensure that the compiler does not reorder the update * of i_update_core above the timestamp updates above. */ - SYNCHRONIZE(); - ip->i_update_core = 1; - if (!(inode->i_state & I_NEW)) + if (sync_it) { + SYNCHRONIZE(); + ip->i_update_core = 1; mark_inode_dirty_sync(inode); + } } /* |