On Tue, Apr 10, 2012 at 01:39:14PM -0600, Jim Schutt wrote:
> Hi,
>
> I hit this BUG today.
>
> I'm running 3.3.1 merged with the ceph and btrfs bits for 3.4,
> i.e. 3.3.1 +
> commit bc3f116fec194 "Btrfs: update the checks for mixed block groups with
> big metadata blocks"
> commit c666601a935b9 "rbd: move snap_rwsem to the device, rename to
> header_rwsem"
>
> The btrfs filesystem in question is backing a Ceph OSD under
> a heavy write load.
>
> Here's the bug:
>
Can you give this a whirl and let me know how it goes? If I'm right you should
see a warning pop up in your messages. Thanks,
Josef
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 26fbe1c..0d81fd4 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -55,6 +55,7 @@ struct extent_page_data {
};
static noinline void flush_write_bio(void *data);
+static void check_buffer_tree_ref(struct extent_buffer *eb);
static inline struct btrfs_fs_info *
tree_fs_info(struct extent_io_tree *tree)
{
@@ -3264,6 +3265,12 @@ retry:
continue;
}
+ if (unlikely(!test_bit(EXTENT_BUFFER_TREE_REF,
+ &eb->bflags))) {
+ WARN_ON(1);
+ check_buffer_tree_ref(eb);
+ }
+
prev_eb = eb;
ret = lock_extent_buffer_for_io(eb, fs_info, &epd);
if (!ret) {
--
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