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; region.sector += wc->start_sector; req.bi_op = REQ_OP_WRITE; -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
