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authorBarry Naujok <bnaujok@sgi.com>2008-05-21 16:58:22 +1000
committerNiv Sardi <xaiki@debian.org>2008-07-28 16:58:40 +1000
commit384f3ced07efdddf6838f6527366089d37843c94 (patch)
tree13037bc99115f6f940b6fe924b75dc48e0577678 /fs/xfs/xfs_da_btree.h
parent9403540c0653122ca34884a180439ddbfcbcb524 (diff)
downloadtalos-obmc-linux-384f3ced07efdddf6838f6527366089d37843c94.tar.gz
talos-obmc-linux-384f3ced07efdddf6838f6527366089d37843c94.zip
[XFS] Return case-insensitive match for dentry cache
This implements the code to store the actual filename found during a lookup in the dentry cache and to avoid multiple entries in the dcache pointing to the same inode. To avoid polluting the dcache, we implement a new directory inode operations for lookup. xfs_vn_ci_lookup() stores the correct case name in the dcache. The "actual name" is only allocated and returned for a case- insensitive match and not an actual match. Another unusual interaction with the dcache is not storing negative dentries like other filesystems doing a d_add(dentry, NULL) when an ENOENT is returned. During the VFS lookup, if a dentry returned has no inode, dput is called and ENOENT is returned. By not doing a d_add, this actually removes it completely from the dcache to be reused. create/rename have to be modified to support unhashed dentries being passed in. SGI-PV: 981521 SGI-Modid: xfs-linux-melb:xfs-kern:31208a Signed-off-by: Barry Naujok <bnaujok@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org>
Diffstat (limited to 'fs/xfs/xfs_da_btree.h')
-rw-r--r--fs/xfs/xfs_da_btree.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/xfs_da_btree.h b/fs/xfs/xfs_da_btree.h
index 8face64c11fb..8be0b00ede9a 100644
--- a/fs/xfs/xfs_da_btree.h
+++ b/fs/xfs/xfs_da_btree.h
@@ -143,6 +143,7 @@ typedef struct xfs_da_args {
#define XFS_DA_OP_RENAME 0x0002 /* this is an atomic rename op */
#define XFS_DA_OP_ADDNAME 0x0004 /* this is an add operation */
#define XFS_DA_OP_OKNOENT 0x0008 /* lookup/add op, ENOENT ok, else die */
+#define XFS_DA_OP_CILOOKUP 0x0010 /* lookup to return CI name if found */
/*
* Structure to describe buffer(s) for a block.
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