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authorMark Fasheh <mfasheh@suse.com>2008-11-12 16:27:44 -0800
committerMark Fasheh <mfasheh@suse.com>2009-04-03 11:39:15 -0700
commit9b7895efac906d66d19856194e1ba61f37e231a4 (patch)
tree1ee6d2630cf3617251638170dcaceef41ddda8ec /fs/ocfs2/alloc.c
parent4a12ca3a00a244e1fd1e673d151ea38b71e11d55 (diff)
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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>
Diffstat (limited to 'fs/ocfs2/alloc.c')
-rw-r--r--fs/ocfs2/alloc.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 19e3a96..678a067 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -294,6 +294,55 @@ static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
.eo_fill_max_leaf_clusters = ocfs2_xattr_tree_fill_max_leaf_clusters,
};
+static void ocfs2_dx_root_set_last_eb_blk(struct ocfs2_extent_tree *et,
+ u64 blkno)
+{
+ struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+ dx_root->dr_last_eb_blk = cpu_to_le64(blkno);
+}
+
+static u64 ocfs2_dx_root_get_last_eb_blk(struct ocfs2_extent_tree *et)
+{
+ struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+ return le64_to_cpu(dx_root->dr_last_eb_blk);
+}
+
+static void ocfs2_dx_root_update_clusters(struct inode *inode,
+ struct ocfs2_extent_tree *et,
+ u32 clusters)
+{
+ struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+ le32_add_cpu(&dx_root->dr_clusters, clusters);
+}
+
+static int ocfs2_dx_root_sanity_check(struct inode *inode,
+ struct ocfs2_extent_tree *et)
+{
+ struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+ BUG_ON(!OCFS2_IS_VALID_DX_ROOT(dx_root));
+
+ return 0;
+}
+
+static void ocfs2_dx_root_fill_root_el(struct ocfs2_extent_tree *et)
+{
+ struct ocfs2_dx_root_block *dx_root = et->et_object;
+
+ et->et_root_el = &dx_root->dr_list;
+}
+
+static struct ocfs2_extent_tree_operations ocfs2_dx_root_et_ops = {
+ .eo_set_last_eb_blk = ocfs2_dx_root_set_last_eb_blk,
+ .eo_get_last_eb_blk = ocfs2_dx_root_get_last_eb_blk,
+ .eo_update_clusters = ocfs2_dx_root_update_clusters,
+ .eo_sanity_check = ocfs2_dx_root_sanity_check,
+ .eo_fill_root_el = ocfs2_dx_root_fill_root_el,
+};
+
static void __ocfs2_init_extent_tree(struct ocfs2_extent_tree *et,
struct inode *inode,
struct buffer_head *bh,
@@ -339,6 +388,14 @@ void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
&ocfs2_xattr_value_et_ops);
}
+void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et,
+ struct inode *inode,
+ struct buffer_head *bh)
+{
+ __ocfs2_init_extent_tree(et, inode, bh, ocfs2_journal_access_dr,
+ NULL, &ocfs2_dx_root_et_ops);
+}
+
static inline void ocfs2_et_set_last_eb_blk(struct ocfs2_extent_tree *et,
u64 new_last_eb_blk)
{