From: Christoph Hellwig hch@lst.de
commit c83b56d1dd87cf67492bb770c26d6f87aee70ed6 upstream.
btrfs_redirty_list_add zeroes the buffer data and sets the EXTENT_BUFFER_NO_CHECK to make sure writeback is fine with a bogus header. But it does that after already marking the buffer dirty, which means that writeback could already be looking at the buffer.
Switch the order of operations around so that the buffer is only marked dirty when we're ready to write it.
Fixes: d3575156f662 ("btrfs: zoned: redirty released extent buffers") CC: stable@vger.kernel.org # 5.15+ Signed-off-by: Christoph Hellwig hch@lst.de Reviewed-by: David Sterba dsterba@suse.com Signed-off-by: David Sterba dsterba@suse.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/btrfs/zoned.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -1606,11 +1606,11 @@ void btrfs_redirty_list_add(struct btrfs !list_empty(&eb->release_list)) return;
+ memzero_extent_buffer(eb, 0, eb->len); + set_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags); set_extent_buffer_dirty(eb); set_extent_bits_nowait(&trans->dirty_pages, eb->start, eb->start + eb->len - 1, EXTENT_DIRTY); - memzero_extent_buffer(eb, 0, eb->len); - set_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags);
spin_lock(&trans->releasing_ebs_lock); list_add_tail(&eb->release_list, &trans->releasing_ebs);