Commit a9c0fda4 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Mike Snitzer
Browse files

dm integrity: don't re-write metadata if discarding same blocks 



If we discard already discarded blocks we do not need to write discard
pattern to the metadata, because it is already there.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent f99a8e43

drivers/md/dm-integrity.c

+4 −2
Original line number Diff line number Diff line
@@ -1429,8 +1429,10 @@ static int dm_integrity_rw_tag(struct dm_integrity_c *ic, unsigned char *tag, se 
		if (op == TAG_READ) {

			memcpy(tag, dp, to_copy);

		} else if (op == TAG_WRITE) {

			if (memcmp(dp, tag, to_copy)) {

				memcpy(dp, tag, to_copy);

				dm_bufio_mark_partial_buffer_dirty(b, *metadata_offset, *metadata_offset + to_copy);

			}

		} else {

			/* e.g.: op == TAG_CMP */