Merge tag 'stable/for-linus-3.8-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel...

[~andy/linux] / fs / btrfs / file-item.c

diff --git a/fs/btrfs/file-item.c b/fs/btrfs/file-item.c
index 1ad08e4e4a15fa25ea7f65397cbc1e154fa1f4b9..bd38cef4235882425c08eb6a5d10306736a14237 100644 (file)
--- a/fs/btrfs/file-item.c
+++ b/fs/btrfs/file-item.c
@@ -133,7 +133,6 @@ fail:
        return ERR_PTR(ret);
 }
 
-
 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
                             struct btrfs_root *root,
                             struct btrfs_path *path, u64 objectid,
@@ -151,6 +150,26 @@ int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
        return ret;
 }
 
+u64 btrfs_file_extent_length(struct btrfs_path *path)
+{
+       int extent_type;
+       struct btrfs_file_extent_item *fi;
+       u64 len;
+
+       fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
+                           struct btrfs_file_extent_item);
+       extent_type = btrfs_file_extent_type(path->nodes[0], fi);
+
+       if (extent_type == BTRFS_FILE_EXTENT_REG ||
+           extent_type == BTRFS_FILE_EXTENT_PREALLOC)
+               len = btrfs_file_extent_num_bytes(path->nodes[0], fi);
+       else if (extent_type == BTRFS_FILE_EXTENT_INLINE)
+               len = btrfs_file_extent_inline_len(path->nodes[0], fi);
+       else
+               BUG();
+
+       return len;
+}
 
 static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
                                   struct inode *inode, struct bio *bio,