On Mon, May 17, 2021 at 05:57:24PM +0100, Matthew Wilcox (Oracle) wrote:

From: Christoph Hellwig <hch@lst.de>

commit 1cea335d1db1ce6ab71b3d2f94a807112b738a0f upstream

bio completions can race when a page spans more than one file system
block.  Add a spinlock to synchronize marking the page uptodate.

Fixes: 9dc55f1389f9 ("iomap: add support for sub-pagesize buffered I/O without buffer heads")
Reported-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <redacted>
Reviewed-by: Darrick J. Wong <redacted>
Signed-off-by: Darrick J. Wong <redacted>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 fs/iomap.c            | 34 ++++++++++++++++++++++++----------
 include/linux/iomap.h |  1 +
 2 files changed, 25 insertions(+), 10 deletions(-)

Now queued up, thnaks.

greg k-h