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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.h
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.h')
-rw-r--r--fs/xfs/xfs_da_btree.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/xfs/xfs_da_btree.h b/fs/xfs/xfs_da_btree.h
index 7facf86f74f9..e64c6924996f 100644
--- a/fs/xfs/xfs_da_btree.h
+++ b/fs/xfs/xfs_da_btree.h
@@ -99,6 +99,15 @@ typedef struct xfs_da_node_entry xfs_da_node_entry_t;
*========================================================================*/
/*
+ * Search comparison results
+ */
+enum xfs_dacmp {
+ XFS_CMP_DIFFERENT, /* names are completely different */
+ XFS_CMP_EXACT, /* names are exactly the same */
+ XFS_CMP_CASE /* names are same but differ in case */
+};
+
+/*
* Structure to ease passing around component names.
*/
typedef struct xfs_da_args {
@@ -127,6 +136,7 @@ typedef struct xfs_da_args {
unsigned char rename; /* T/F: this is an atomic rename op */
unsigned char addname; /* T/F: this is an add operation */
unsigned char oknoent; /* T/F: ok to return ENOENT, else die */
+ enum xfs_dacmp cmpresult; /* name compare result for lookups */
} xfs_da_args_t;
/*
@@ -201,6 +211,14 @@ typedef struct xfs_da_state {
(uint)(XFS_DA_LOGOFF(BASE, ADDR)), \
(uint)(XFS_DA_LOGOFF(BASE, ADDR)+(SIZE)-1)
+/*
+ * Name ops for directory and/or attr name operations
+ */
+struct xfs_nameops {
+ xfs_dahash_t (*hashname)(struct xfs_name *);
+ enum xfs_dacmp (*compname)(struct xfs_da_args *, const char *, int);
+};
+
#ifdef __KERNEL__
/*========================================================================
@@ -249,6 +267,10 @@ int xfs_da_shrink_inode(xfs_da_args_t *args, xfs_dablk_t dead_blkno,
xfs_dabuf_t *dead_buf);
uint xfs_da_hashname(const uchar_t *name_string, int name_length);
+enum xfs_dacmp xfs_da_compname(struct xfs_da_args *args,
+ const char *name, int len);
+
+
xfs_da_state_t *xfs_da_state_alloc(void);
void xfs_da_state_free(xfs_da_state_t *state);