block: Don't trim an atomic write

This is disallowed.

This check will now be relevant since the device mapper personalities
will start to support atomic writes, and they use this function.

Signed-off-by: John Garry <[email protected]>
Reviewed-by: Mike Snitzer <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: johnpgarry

block/bio.c

@@ -1610,6 +1610,10 @@ EXPORT_SYMBOL(bio_split);
  */
 void bio_trim(struct bio *bio, sector_t offset, sector_t size)
 {
+	/* We should never trim an atomic write */
+	if (WARN_ON_ONCE(bio->bi_opf & REQ_ATOMIC && size))
+		return;
+
 	if (WARN_ON_ONCE(offset > BIO_MAX_SECTORS || size > BIO_MAX_SECTORS ||
 			 offset + size > bio_sectors(bio)))
 		return;