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authorBarry Naujok <bnaujok@sgi.com>2008-05-21 16:41:01 +1000
committerNiv Sardi <xaiki@debian.org>2008-07-28 16:58:36 +1000
commit5163f95a08cbf058ae16452c2242c5600fedc32e (patch)
tree5d6b905f7031144a62fb1fa17ba3106d99268003 /fs/xfs/xfs_da_btree.c
parent68f34d5107dbace3d14a1c2f060fc8941894879c (diff)
downloadlinux-5163f95a08cbf058ae16452c2242c5600fedc32e.tar.bz2
[XFS] Name operation vector for hash and compare
Adds two pieces of functionality for the basis of case-insensitive support in XFS: 1. A comparison result enumerated type: xfs_dacmp. It represents an exact match, case-insensitive match or no match at all. This patch only implements different and exact results. 2. xfs_nameops vector for specifying how to perform the hash generation of filenames and comparision methods. In this patch the hash vector points to the existing xfs_da_hashname function and the comparison method does a length compare, and if the same, does a memcmp and return the xfs_dacmp result. All filename functions that use the hash (create, lookup remove, rename, etc) now use the xfs_nameops.hashname function and all directory lookup functions also use the xfs_nameops.compname function. The lookup functions also handle case-insensitive results even though the default comparison function cannot return that. And important aspect of the lookup functions is that an exact match always has precedence over a case-insensitive. So while a case-insensitive match is found, we have to keep looking just in case there is an exact match. In the meantime, the info for the first case-insensitive match is retained if no exact match is found. SGI-PV: 981519 SGI-Modid: xfs-linux-melb:xfs-kern:31205a Signed-off-by: Barry Naujok <bnaujok@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org>
Diffstat (limited to 'fs/xfs/xfs_da_btree.c')
-rw-r--r--fs/xfs/xfs_da_btree.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/xfs/xfs_da_btree.c b/fs/xfs/xfs_da_btree.c
index 294780427abb..ae4b18c7726b 100644
--- a/fs/xfs/xfs_da_btree.c
+++ b/fs/xfs/xfs_da_btree.c
@@ -1530,6 +1530,28 @@ xfs_da_hashname(const uchar_t *name, int namelen)
}
}
+enum xfs_dacmp
+xfs_da_compname(
+ struct xfs_da_args *args,
+ const char *name,
+ int len)
+{
+ return (args->namelen == len && memcmp(args->name, name, len) == 0) ?
+ XFS_CMP_EXACT : XFS_CMP_DIFFERENT;
+}
+
+static xfs_dahash_t
+xfs_default_hashname(
+ struct xfs_name *name)
+{
+ return xfs_da_hashname(name->name, name->len);
+}
+
+const struct xfs_nameops xfs_default_nameops = {
+ .hashname = xfs_default_hashname,
+ .compname = xfs_da_compname
+};
+
/*
* Add a block to the btree ahead of the file.
* Return the new block number to the caller.