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xfs: optimize the negative xattr caching

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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>
This commit is contained in:
Christoph Hellwig 2011-07-26 15:07:29 +00:00 committed by Alex Elder
parent d1166ec792
commit 510792ee29
1 changed files with 7 additions and 2 deletions
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9
fs/xfs/linux-2.6/xfs_iops.c
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@ -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();