Btrfs: fix wrong max inline data size limit

inline data is stored from offset of @disk_bytenr in
struct btrfs_file_extent_item. So substracting total
size of struct btrfs_file_extent_item is wrong, fix it.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 6fc16d22d27d1e7b50692930adac37a38acc41ff..840ecb78e727459da9e5e0dced89a561b5cb97f9 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -394,7 +394,7 @@ struct btrfs_header {
 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->nodesize))
 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
                                        sizeof(struct btrfs_item) - \
-                                       sizeof(struct btrfs_file_extent_item))
+                                       offsetof(struct btrfs_file_extent_item, disk_bytenr))
 #define BTRFS_MAX_XATTR_SIZE(r)        (BTRFS_LEAF_DATA_SIZE(r) - \
                                 sizeof(struct btrfs_item) -\
                                 sizeof(struct btrfs_dir_item))