From: Mikulas Patocka Date: Sun, 6 Jun 2021 20:13:16 +0000 (-0400) Subject: dm writecache: commit just one block, not a full page X-Git-Tag: v5.12.18~150 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f28319b5d341e4a7ad890167e306856a2f2d61b5;p=thirdparty%2Fkernel%2Fstable.git dm writecache: commit just one block, not a full page [ Upstream commit 991bd8d7bc78966b4dc427b53a144f276bffcd52 ] Some architectures have pages larger than 4k and committing a full page causes needless overhead. Fix this by writing a single block when committing the superblock. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer Signed-off-by: Sasha Levin --- diff --git a/drivers/md/dm-writecache.c b/drivers/md/dm-writecache.c index 7bb4d83e90cc2..51b26db56ba97 100644 --- a/drivers/md/dm-writecache.c +++ b/drivers/md/dm-writecache.c @@ -532,11 +532,7 @@ static void ssd_commit_superblock(struct dm_writecache *wc) region.bdev = wc->ssd_dev->bdev; region.sector = 0; - region.count = PAGE_SIZE >> SECTOR_SHIFT; - - if (unlikely(region.sector + region.count > wc->metadata_sectors)) - region.count = wc->metadata_sectors - region.sector; - + region.count = wc->block_size >> SECTOR_SHIFT; region.sector += wc->start_sector; req.bi_op = REQ_OP_WRITE;