[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>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 96d8791e9e5a..2a75f1703b39 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -61,6 +61,7 @@ struct xfs_bmap_free;
 struct xfs_extdelta;
 struct xfs_swapext;
 struct xfs_mru_cache;
+struct xfs_nameops;
 
 /*
  * Prototypes and functions for the Data Migration subsystem.
@@ -315,6 +316,7 @@ typedef struct xfs_mount {
         __uint8_t               m_inode_quiesce;/* call quiesce on new inodes.
                                                    field governed by m_ilock */
         __uint8_t               m_sectbb_log;   /* sectlog - BBSHIFT */
+        const struct xfs_nameops *m_dirnameops; /* vector of dir name ops */
         int                     m_dirblksize;   /* directory block sz--bytes */
         int                     m_dirblkfsbs;   /* directory block sz--fsbs */
         xfs_dablk_t             m_dirdatablk;   /* blockno of dir data v2 */