Test if dm-writecache block size is smaller than devices' logical block size and reject target load in that case.
Signed-off-by: Mikulas Patocka <[email protected]> --- drivers/md/dm-writecache.c | 6 ++++++ 1 file changed, 6 insertions(+) Index: linux-2.6/drivers/md/dm-writecache.c =================================================================== --- linux-2.6.orig/drivers/md/dm-writecache.c 2020-04-15 16:53:35.000000000 +0200 +++ linux-2.6/drivers/md/dm-writecache.c 2020-04-15 17:05:34.000000000 +0200 @@ -2128,6 +2128,12 @@ static int writecache_ctr(struct dm_targ ti->error = "Invalid block size"; goto bad; } + if (wc->block_size < bdev_logical_block_size(wc->dev->bdev) || + wc->block_size < bdev_logical_block_size(wc->ssd_dev->bdev)) { + r = -EINVAL; + ti->error = "Block size is smaller than device logical block size"; + goto bad; + } wc->block_size_bits = __ffs(wc->block_size); wc->max_writeback_jobs = MAX_WRITEBACK_JOBS; -- dm-devel mailing list [email protected] https://www.redhat.com/mailman/listinfo/dm-devel
