ocfs2: Add a name indexed b-tree to directory inodes

This patch makes use of Ocfs2's flexible btree code to add an additional
tree to directory inodes. The new tree stores an array of small,
fixed-length records in each leaf block. Each record stores a hash value,
and pointer to a block in the traditional (unindexed) directory tree where a
dirent with the given name hash resides. Lookup exclusively uses this tree
to find dirents, thus providing us with constant time name lookups.

Some of the hashing code was copied from ext3. Unfortunately, it has lots of
unfixed checkpatch errors. I left that as-is so that tracking changes would
be easier.

Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Acked-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 2 insertions, 6 deletions

diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 2563df89fc2a..15631019dc63 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -512,7 +512,7 @@ int ocfs2_calc_xattr_init(struct inode *dir,
                           struct ocfs2_security_xattr_info *si,
                           int *want_clusters,
                           int *xattr_credits,
-                          struct ocfs2_alloc_context **xattr_ac)
+                          int *want_meta)
 {
         int ret = 0;
         struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
@@ -554,11 +554,7 @@ int ocfs2_calc_xattr_init(struct inode *dir,
         if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
             (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
             (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
-                ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
-                if (ret) {
-                        mlog_errno(ret);
-                        return ret;
-                }
+                *want_meta = *want_meta + 1;
                 *xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
         }