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authorChristoph Hellwig <hch@infradead.org>2011-07-26 15:07:29 +0000
committerAlex Elder <aelder@sgi.com>2011-07-26 22:06:50 -0500
commit510792ee29770a38dd409bf2b469ade2fea9eb52 (patch)
treeed442b019b3ce77c4cead40082e7229bb7044eed
parentd1166ec792c96b65e4c18cbc5985944b5309d838 (diff)
downloadlinux-510792ee29770a38dd409bf2b469ade2fea9eb52.tar.bz2
xfs: optimize the negative xattr caching
Since the addition of file capabilities every write needs to read xattrs to check if we have any capabilities to clear. In Linux 3.0 Andi Kleen added a flag to cache the fact that we do not have any attributes on an inode. Make sure to already mark a file as not having any attributes when reading it from disk in case it doesn't even have an attribute fork. Based on an earlier patch from Andi Kleen. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
-rw-r--r--fs/xfs/linux-2.6/xfs_iops.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index 6544c3236bc8..b9c172b3fbbe 100644
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -1194,9 +1194,14 @@ xfs_setup_inode(
break;
}
- /* if there is no attribute fork no ACL can exist on this inode */
- if (!XFS_IFORK_Q(ip))
+ /*
+ * If there is no attribute fork no ACL can exist on this inode,
+ * and it can't have any file capabilities attached to it either.
+ */
+ if (!XFS_IFORK_Q(ip)) {
+ inode_has_no_xattr(inode);
cache_no_acl(inode);
+ }
xfs_iflags_clear(ip, XFS_INEW);
barrier();