Btrfs: Full back reference support

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

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 65b4f864b0df5ab23024bdd61c337712d9bc78d8..2e7d82ec5d18d681f02fcda9c8e236181028f169 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -528,6 +528,9 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
        struct btrfs_trans_handle *trans;
        struct btrfs_ordered_extent *ordered_extent;
        struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+       struct btrfs_file_extent_item *extent_item;
+       struct btrfs_path *path = NULL;
+       struct extent_buffer *leaf;
        u64 alloc_hint = 0;
        struct list_head list;
        struct btrfs_key ins;
@@ -544,20 +547,15 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
        if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags))
                goto nocow;
 
+       path = btrfs_alloc_path();
+       BUG_ON(!path);
+
        lock_extent(io_tree, ordered_extent->file_offset,
                    ordered_extent->file_offset + ordered_extent->len - 1,
                    GFP_NOFS);
 
        INIT_LIST_HEAD(&list);
 
-       ins.objectid = ordered_extent->start;
-       ins.offset = ordered_extent->len;
-       ins.type = BTRFS_EXTENT_ITEM_KEY;
-
-       ret = btrfs_alloc_reserved_extent(trans, root, root->root_key.objectid,
-                                         trans->transid, inode->i_ino,
-                                         ordered_extent->file_offset, &ins);
-       BUG_ON(ret);
        mutex_lock(&BTRFS_I(inode)->extent_mutex);
 
        ret = btrfs_drop_extents(trans, root, inode,
@@ -566,18 +564,42 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
                                 ordered_extent->len,
                                 ordered_extent->file_offset, &alloc_hint);
        BUG_ON(ret);
-       ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
-                                      ordered_extent->file_offset,
-                                      ordered_extent->start,
-                                      ordered_extent->len,
-                                      ordered_extent->len, 0);
+
+       ins.objectid = inode->i_ino;
+       ins.offset = ordered_extent->file_offset;
+       ins.type = BTRFS_EXTENT_DATA_KEY;
+       ret = btrfs_insert_empty_item(trans, root, path, &ins,
+                                     sizeof(*extent_item));
        BUG_ON(ret);
+       leaf = path->nodes[0];
+       extent_item = btrfs_item_ptr(leaf, path->slots[0],
+                                    struct btrfs_file_extent_item);
+       btrfs_set_file_extent_generation(leaf, extent_item, trans->transid);
+       btrfs_set_file_extent_type(leaf, extent_item, BTRFS_FILE_EXTENT_REG);
+       btrfs_set_file_extent_disk_bytenr(leaf, extent_item,
+                                         ordered_extent->start);
+       btrfs_set_file_extent_disk_num_bytes(leaf, extent_item,
+                                            ordered_extent->len);
+       btrfs_set_file_extent_offset(leaf, extent_item, 0);
+       btrfs_set_file_extent_num_bytes(leaf, extent_item,
+                                       ordered_extent->len);
+       btrfs_mark_buffer_dirty(leaf);
 
        btrfs_drop_extent_cache(inode, ordered_extent->file_offset,
                                ordered_extent->file_offset +
                                ordered_extent->len - 1);
        mutex_unlock(&BTRFS_I(inode)->extent_mutex);
 
+       ins.objectid = ordered_extent->start;
+       ins.offset = ordered_extent->len;
+       ins.type = BTRFS_EXTENT_ITEM_KEY;
+       ret = btrfs_alloc_reserved_extent(trans, root, leaf->start,
+                                         root->root_key.objectid,
+                                         trans->transid, inode->i_ino,
+                                         ordered_extent->file_offset, &ins);
+       BUG_ON(ret);
+       btrfs_release_path(root, path);
+
        inode->i_blocks += ordered_extent->len >> 9;
        unlock_extent(io_tree, ordered_extent->file_offset,
                    ordered_extent->file_offset + ordered_extent->len - 1,
@@ -596,6 +618,8 @@ nocow:
        btrfs_put_ordered_extent(ordered_extent);
 
        btrfs_end_transaction(trans, root);
+       if (path)
+               btrfs_free_path(path);
        return 0;
 }
 
@@ -1433,10 +1457,7 @@ search_again:
                                        if (root->ref_cows)
                                                dec_i_blocks(inode, num_dec);
                                }
-                               if (root->ref_cows) {
-                                       root_gen =
-                                               btrfs_header_generation(leaf);
-                               }
+                               root_gen = btrfs_header_generation(leaf);
                                root_owner = btrfs_header_owner(leaf);
                        }
                } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
@@ -1477,7 +1498,7 @@ delete:
                if (found_extent) {
                        ret = btrfs_free_extent(trans, root, extent_start,
                                                extent_num_bytes,
-                                               root_owner,
+                                               leaf->start, root_owner,
                                                root_gen, inode->i_ino,
                                                found_key.offset, 0);
                        BUG_ON(ret);