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Commit 048e5a07 authored by Mike Snitzer's avatar Mike Snitzer
Browse files

dm cache metadata: do not allow the data block size to change 



The block size for the dm-cache's data device must remained fixed for
the life of the cache.  Disallow any attempt to change the cache's data
block size.

Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
Acked-by: default avatarJoe Thornber <ejt@redhat.com>
Cc: stable@vger.kernel.org
parent 9aec8629

drivers/md/dm-cache-metadata.c

+9 −0
Original line number Diff line number Diff line
@@ -425,6 +425,15 @@ static int __open_metadata(struct dm_cache_metadata *cmd) 


	disk_super = dm_block_data(sblock);



	/* Verify the data block size hasn't changed */

	if (le32_to_cpu(disk_super->data_block_size) != cmd->data_block_size) {

		DMERR("changing the data block size (from %u to %llu) is not supported",

		      le32_to_cpu(disk_super->data_block_size),

		      (unsigned long long)cmd->data_block_size);

		r = -EINVAL;

		goto bad;

	}



	r = __check_incompat_features(disk_super, cmd);

	if (r < 0)

		goto bad;