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dm writecache: commit just one block, not a full page

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[ Upstream commit 991bd8d7bc ]

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 <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mikulas Patocka 2021-06-06 16:13:16 -04:00 • committed by Greg Kroah-Hartman
commit ad7083a95d
1 changed files with 1 additions and 5 deletions
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6
drivers/md/dm-writecache.c
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@ -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;