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 <mpatocka@xxxxxxxxxx>
---
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;
--
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