ocfs2: Add xattr index tree operations

When necessary, an ocfs2_xattr_block will embed an ocfs2_extent_list to
store large numbers of EAs. This patch adds a new type in
ocfs2_extent_tree_type and adds the implementation so that we can re-use the
b-tree code to handle the storage of many EAs.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

2 files changed, 99 insertions, 0 deletions

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index ace27d1ca574..06ea7913c134 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -177,6 +177,48 @@ static struct ocfs2_extent_tree_operations ocfs2_xattr_et_ops = {
         .sanity_check           = ocfs2_xattr_value_sanity_check,
 };
 
+static void ocfs2_xattr_tree_set_last_eb_blk(struct ocfs2_extent_tree *et,
+                                             u64 blkno)
+{
+        struct ocfs2_xattr_block *xb =
+                (struct ocfs2_xattr_block *) et->root_bh->b_data;
+        struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
+
+        xt->xt_last_eb_blk = cpu_to_le64(blkno);
+}
+
+static u64 ocfs2_xattr_tree_get_last_eb_blk(struct ocfs2_extent_tree *et)
+{
+        struct ocfs2_xattr_block *xb =
+                (struct ocfs2_xattr_block *) et->root_bh->b_data;
+        struct ocfs2_xattr_tree_root *xt = &xb->xb_attrs.xb_root;
+
+        return le64_to_cpu(xt->xt_last_eb_blk);
+}
+
+static void ocfs2_xattr_tree_update_clusters(struct inode *inode,
+                                             struct ocfs2_extent_tree *et,
+                                             u32 clusters)
+{
+        struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)et->root_bh->b_data;
+
+        le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, clusters);
+}
+
+static int ocfs2_xattr_tree_sanity_check(struct inode *inode,
+                                         struct ocfs2_extent_tree *et)
+{
+        return 0;
+}
+
+static struct ocfs2_extent_tree_operations ocfs2_xattr_tree_et_ops = {
+        .set_last_eb_blk        = ocfs2_xattr_tree_set_last_eb_blk,
+        .get_last_eb_blk        = ocfs2_xattr_tree_get_last_eb_blk,
+        .update_clusters        = ocfs2_xattr_tree_update_clusters,
+        .sanity_check           = ocfs2_xattr_tree_sanity_check,
+};
+
 static struct ocfs2_extent_tree*
          ocfs2_new_extent_tree(struct buffer_head *bh,
                                enum ocfs2_extent_tree_type et_type,
@@ -201,6 +243,11 @@ static struct ocfs2_extent_tree*
                         (struct ocfs2_xattr_value_root *) private;
                 et->root_el = &xv->xr_list;
                 et->eops = &ocfs2_xattr_et_ops;
+        } else if (et_type == OCFS2_XATTR_TREE_EXTENT) {
+                struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)bh->b_data;
+                et->root_el = &xb->xb_attrs.xb_root.xt_list;
+                et->eops = &ocfs2_xattr_tree_et_ops;
         }
 
         return et;
@@ -570,6 +617,12 @@ int ocfs2_num_free_extents(struct ocfs2_super *osb,
 
                 last_eb_blk = le64_to_cpu(xv->xr_last_eb_blk);
                 el = &xv->xr_list;
+        } else if (type == OCFS2_XATTR_TREE_EXTENT) {
+                struct ocfs2_xattr_block *xb =
+                        (struct ocfs2_xattr_block *)root_bh->b_data;
+
+                last_eb_blk = le64_to_cpu(xb->xb_attrs.xb_root.xt_last_eb_blk);
+                el = &xb->xb_attrs.xb_root.xt_list;
         }
 
         if (last_eb_blk) {
@@ -4397,6 +4450,36 @@ bail:
         return status;
 }
 
+int ocfs2_xattr_tree_insert_extent(struct ocfs2_super *osb,
+                                   handle_t *handle,
+                                   struct inode *inode,
+                                   struct buffer_head *root_bh,
+                                   u32 cpos,
+                                   u64 start_blk,
+                                   u32 new_clusters,
+                                   u8 flags,
+                                   struct ocfs2_alloc_context *meta_ac)
+{
+        int status;
+        struct ocfs2_extent_tree *et = NULL;
+
+        et = ocfs2_new_extent_tree(root_bh, OCFS2_XATTR_TREE_EXTENT, NULL);
+        if (!et) {
+                status = -ENOMEM;
+                mlog_errno(status);
+                goto bail;
+        }
+
+        status = ocfs2_insert_extent(osb, handle, inode, root_bh,
+                                     cpos, start_blk, new_clusters,
+                                     flags, meta_ac, et);
+
+        if (et)
+                ocfs2_free_extent_tree(et);
+bail:
+        return status;
+}
+
 /*
  * Allcate and add clusters into the extent b-tree.
  * The new clusters(clusters_to_add) will be inserted at logical_offset.
@@ -4482,6 +4565,12 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
                 status = ocfs2_dinode_insert_extent(osb, handle, inode, root_bh,
                                                     *logical_offset, block,
                                                     num_bits, flags, meta_ac);
+        else if (type == OCFS2_XATTR_TREE_EXTENT)
+                status = ocfs2_xattr_tree_insert_extent(osb, handle,
+                                                        inode, root_bh,
+                                                        *logical_offset,
+                                                        block, num_bits, flags,
+                                                        meta_ac);
         else
                 status = ocfs2_xattr_value_insert_extent(osb, handle,
                                                          inode, root_bh,
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index ec7baeb2ea7d..cd4e12d2b6b9 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -29,6 +29,7 @@
 enum ocfs2_extent_tree_type {
         OCFS2_DINODE_EXTENT = 0,
         OCFS2_XATTR_VALUE_EXTENT,
+        OCFS2_XATTR_TREE_EXTENT,
 };
 
 struct ocfs2_alloc_context;
@@ -51,6 +52,15 @@ int ocfs2_xattr_value_insert_extent(struct ocfs2_super *osb,
                                     u8 flags,
                                     struct ocfs2_alloc_context *meta_ac,
                                     void *private);
+int ocfs2_xattr_tree_insert_extent(struct ocfs2_super *osb,
+                                   handle_t *handle,
+                                   struct inode *inode,
+                                   struct buffer_head *root_bh,
+                                   u32 cpos,
+                                   u64 start_blk,
+                                   u32 new_clusters,
+                                   u8 flags,
+                                   struct ocfs2_alloc_context *meta_ac);
 enum ocfs2_alloc_restarted {
         RESTART_NONE = 0,
         RESTART_TRANS,