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Commit 8abb2a5d authored by Kent Overstreet's avatar Kent Overstreet
Browse files

bcache: Make sure blocksize isn't smaller than device blocksize 



Sanity check to make sure we don't end up doing IO the device doesn't
support.

Signed-off-by: default avatarKent Overstreet <koverstreet@google.com>
parent a09ded8e

drivers/md/bcache/super.c

+6 −2
Original line number Diff line number Diff line
@@ -139,13 +139,17 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev, 
	if (bch_is_zero(sb->uuid, 16))

		goto err;



	sb->block_size	= le16_to_cpu(s->block_size);



	err = "Superblock block size smaller than device block size";

	if (sb->block_size << 9 < bdev_logical_block_size(bdev))

		goto err;



	switch (sb->version) {

	case BCACHE_SB_VERSION_BDEV:

		sb->block_size	= le16_to_cpu(s->block_size);

		sb->data_offset	= BDEV_DATA_START_DEFAULT;

		break;

	case BCACHE_SB_VERSION_BDEV_WITH_OFFSET:

		sb->block_size	= le16_to_cpu(s->block_size);

		sb->data_offset	= le64_to_cpu(s->data_offset);



		err = "Bad data offset";