The improperly set bucket or block size will trigger error in read_super_basic(). For large bucket size, a more accurate error message for invalid bucket or block size is necessary. This patch disassembles the combined if() checks into multile single if() check, and provide more accurate error message for each check failure condition. Signed-off-by: Coly Li <colyli@xxxxxxx> --- drivers/md/bcache/super.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 88523be84887..d6082b68aa26 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -79,11 +79,20 @@ static const char * read_super_basic(struct cache_sb *sb, struct block_device * if (sb->nbuckets < 1 << 7) goto err; - err = "Bad block/bucket size"; - if (!is_power_of_2(sb->block_size) || - sb->block_size > PAGE_SECTORS || - !is_power_of_2(sb->bucket_size) || - sb->bucket_size < PAGE_SECTORS) + err = "Bad block size (not power of 2)"; + if (!is_power_of_2(sb->block_size)) + goto err; + + err = "Bad block size (larger than page size)"; + if (sb->block_size > PAGE_SECTORS) + goto err; + + err = "Bad bucket size (not power of 2)"; + if (!is_power_of_2(sb->bucket_size)) + goto err; + + err = "Bad bucket size (smaller than page size)"; + if (sb->bucket_size < PAGE_SECTORS) goto err; err = "Invalid superblock: device too small"; -- 2.26.2
