On Sun, Jun 6, 2021 at 10:14 PM Mikulas Patocka <mpatocka@xxxxxxxxxx> wrote:
When comitting superblock, we need to write just one block, we don't need
to write full page. Some architectures have pages larger than 4k and
committing full page is needless overhead.
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Index: linux-2.6/drivers/md/dm-writecache.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-writecache.c
+++ linux-2.6/drivers/md/dm-writecache.c
@@ -532,11 +532,7 @@ static void ssd_commit_superblock(struct
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;
You can use to_sector() here.
region.sector += wc->start_sector;
req.bi_op = REQ_OP_WRITE;
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