On 26.03.2018 11:27, Anand Jain wrote:
> We check the %csum_type twice. Drop one. Check for the csum_type and
> then for the csum. Which also matches with the progs which have better
> logic. This is preparatory patch to get proper error code from
> btrfs_check_super_csum().
>
> Signed-off-by: Anand Jain <anand.j...@oracle.com>
Reviewed-by: Nikolay Borisov <nbori...@suse.com>
> ---
> fs/btrfs/disk-io.c | 38 +++++++++++++++++---------------------
> 1 file changed, 17 insertions(+), 21 deletions(-)
>
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index 1657d6aa4fa6..b9b435579527 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -399,32 +399,28 @@ static int btrfs_check_super_csum(struct btrfs_fs_info
> *fs_info,
> struct btrfs_super_block *disk_sb =
> (struct btrfs_super_block *)raw_disk_sb;
> u16 csum_type = btrfs_super_csum_type(disk_sb);
> - int ret = 0;
> -
> - if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
> - u32 crc = ~(u32)0;
> - char result[sizeof(crc)];
> -
> - /*
> - * The super_block structure does not span the whole
> - * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space
> - * is filled with zeros and is included in the checksum.
> - */
> - crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE,
> - crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
> - btrfs_csum_final(crc, result);
> -
> - if (memcmp(raw_disk_sb, result, sizeof(result)))
> - ret = 1;
> - }
> + u32 crc = ~(u32)0;
> + char result[sizeof(crc)];
>
> if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
> btrfs_err(fs_info, "unsupported checksum algorithm %u",
> - csum_type);
> - ret = 1;
> + csum_type);
> + return 1;
> }
>
> - return ret;
> + /*
> + * The super_block structure does not span the whole
> + * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space
> + * is filled with zeros and is included in the checksum.
> + */
> + crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE,
> + crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
> + btrfs_csum_final(crc, result);
> +
> + if (memcmp(raw_disk_sb, result, sizeof(result)))
> + return 1;
> +
> + return 0;
> }
>
> /*
>
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
