Btrfs: Add mount option to turn off data cow

[linux-2.6-block.git] / fs / btrfs / ctree.h

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 5e255cabfd1057529f7e49d84f47061c9537b39e..b51b021fff85e9ad70f0ed6c5af0f1849cfded85 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -431,6 +431,7 @@ struct btrfs_root {
 #define BTRFS_STRING_ITEM_KEY  253
 
 #define BTRFS_MOUNT_NODATASUM          0x1
+#define BTRFS_MOUNT_NODATACOW          0x2
 
 #define btrfs_clear_opt(o, opt)                ((o) &= ~BTRFS_MOUNT_##opt)
 #define btrfs_set_opt(o, opt)          ((o) |= BTRFS_MOUNT_##opt)
@@ -915,6 +916,9 @@ static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
        btrfs_item_offset_nr(leaf, slot)))
 
 /* extent-tree.c */
+u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
+                                 struct btrfs_path *count_path,
+                                 u64 first_extent);
 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
                         struct btrfs_root *root);
 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
@@ -974,6 +978,10 @@ int btrfs_cow_block(struct btrfs_trans_handle *trans,
                    struct btrfs_root *root, struct extent_buffer *buf,
                    struct extent_buffer *parent, int parent_slot,
                    struct extent_buffer **cow_ret);
+int btrfs_copy_root(struct btrfs_trans_handle *trans,
+                     struct btrfs_root *root,
+                     struct extent_buffer *buf,
+                     struct extent_buffer **cow_ret, u64 new_root_objectid);
 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
                      *root, struct btrfs_path *path, u32 data_size);
 int btrfs_truncate_item(struct btrfs_trans_handle *trans,