Btrfs: sparse files!

[linux-2.6-block.git] / fs / btrfs / extent-tree.c

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index e3c6bfea3751e32d69a7143c857d2ce9b3a771a3..a366415e03a6769d179390330a79cd01f129329d 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -443,6 +443,7 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
        buf_leaf = btrfs_buffer_leaf(buf);
        for (i = 0; i < btrfs_header_nritems(&buf_node->header); i++) {
                if (leaf) {
+                       u64 disk_blocknr;
                        key = &buf_leaf->items[i].key;
                        if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY)
                                continue;
@@ -451,8 +452,10 @@ int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
                        if (btrfs_file_extent_type(fi) ==
                            BTRFS_FILE_EXTENT_INLINE)
                                continue;
-                       ret = btrfs_inc_extent_ref(trans, root,
-                                   btrfs_file_extent_disk_blocknr(fi),
+                       disk_blocknr = btrfs_file_extent_disk_blocknr(fi);
+                       if (disk_blocknr == 0)
+                               continue;
+                       ret = btrfs_inc_extent_ref(trans, root, disk_blocknr,
                                    btrfs_file_extent_disk_num_blocks(fi));
                        BUG_ON(ret);
                } else {
@@ -1248,6 +1251,7 @@ static int drop_leaf_ref(struct btrfs_trans_handle *trans,
        leaf = btrfs_buffer_leaf(cur);
        nritems = btrfs_header_nritems(&leaf->header);
        for (i = 0; i < nritems; i++) {
+               u64 disk_blocknr;
                key = &leaf->items[i].key;
                if (btrfs_disk_key_type(key) != BTRFS_EXTENT_DATA_KEY)
                        continue;
@@ -1258,8 +1262,10 @@ static int drop_leaf_ref(struct btrfs_trans_handle *trans,
                 * FIXME make sure to insert a trans record that
                 * repeats the snapshot del on crash
                 */
-               ret = btrfs_free_extent(trans, root,
-                                       btrfs_file_extent_disk_blocknr(fi),
+               disk_blocknr = btrfs_file_extent_disk_blocknr(fi);
+               if (disk_blocknr == 0)
+                       continue;
+               ret = btrfs_free_extent(trans, root, disk_blocknr,
                                        btrfs_file_extent_disk_num_blocks(fi),
                                        0);
                BUG_ON(ret);