fs: btrfs: Use btrfs_iter_dir() to replace btrfs_readdir()

Use extent buffer based infrastructure to re-implement btrfs_readdir().

Along this rework, some small corner cases fixed:
- Subvolume tree mtime
  Mtime of a subvolume tree is recorded in its root item, since there is
  no INODE_ITEM for it.
  This needs extra search from tree root.

- Output the unknown type
  If the DIR_ITEM is corrupted, at least don't try to access the memory
  out of boundary.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Marek Behún <marek.behun@nic.cz>

1 files changed, 0 insertions, 5 deletions

diff --git a/fs/btrfs/btrfs.h b/fs/btrfs/btrfs.h
index 53d53f310b..e36bd89827 100644
--- a/fs/btrfs/btrfs.h
+++ b/fs/btrfs/btrfs.h
@@ -43,13 +43,8 @@ u32 btrfs_decompress(u8 type, const char *, u32, char *, u32);
 int btrfs_read_superblock(void);
 
 /* dir-item.c */
-typedef int (*btrfs_readdir_callback_t)(const struct __btrfs_root *,
-					struct btrfs_dir_item *);
-
 int __btrfs_lookup_dir_item(const struct __btrfs_root *, u64, const char *, int,
 			   struct btrfs_dir_item *);
-int btrfs_readdir(const struct __btrfs_root *, u64, btrfs_readdir_callback_t);
-
 /* root.c */
 int btrfs_find_root(u64, struct __btrfs_root *, struct btrfs_root_item *);
 u64 btrfs_lookup_root_ref(u64, struct btrfs_root_ref *, char *);