On Wed, Mar 06, 2013 at 04:56:40PM +0100, David Sterba wrote:
> The superblock checksum is not verified upon mount. <awkward silence>
Hah!
> /*
> + * Return 0 if the superblock checksum type matches the checksum value of
> that
> + * alghorithm. Pass the raw disk superblock data.
> + */
> +static int btrfs_check_super_csum(char *raw_disk_sb)
I'd have it return 0 or -errno and print warnings with additional info
so that each caller doesn't have to.
> +{
> + struct btrfs_super_block *disk_sb =
> + (struct btrfs_super_block *)raw_disk_sb;
> + u16 csum_type = btrfs_super_csum_type(disk_sb);
> + if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
> + printk(KERN_ERR "btrfs: unsupported checksum algorithm %u\n",
> + csum_type);
> + return 1;
> + }
Does this mean we can get rid of that BUG_ON in btrfs_super_csum_size()?
And you can move this check down in an else after the CRC32 test to get
rid of the extra exit path. Have each case ret = , the end of the
function returns ret.
> + if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
> [...]
> + }
> +
> + return 1;
int ret = 0
if (csum_type == BTRFS_CSUM_TYPE_CRC32) {
[..]
if (memcmp())
ret = -EIO; /* or whatever */
} else if (type > array_size() {
printk("I'm sad.");
ret = -EBOOHOO;
}
return ret;
- z
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