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btrfs: enhance superblock checks

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The superblock checksum is not verified upon mount. <awkward silence>

Add that check and also reorder existing checks to a more logical
order.

Current mkfs.btrfs does not calculate the correct checksum of
super_block and thus a freshly created filesytem will fail to mount when
this patch is applied.

First transaction commit calculates correct superblock checksum and
saves it to disk.

Reproducer:
$ mfks.btrfs /dev/sda
$ mount /dev/sda /mnt
$ btrfs scrub start /mnt
$ sleep 5
$ btrfs scrub status /mnt
... super:2 ...

Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
This commit is contained in:
David Sterba
2013-03-06 15:57:46 +01:00
committed by Chris Mason
parent b6919a58f0
commit 1104a88551
2 changed files with 71 additions and 17 deletions
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6
fs/btrfs/ctree.h
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@@ -2793,8 +2793,10 @@ BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
{
int t = btrfs_super_csum_type(s);
BUG_ON(t >= ARRAY_SIZE(btrfs_csum_sizes));
u16 t = btrfs_super_csum_type(s);
/*
* csum type is validated at mount time
*/
return btrfs_csum_sizes[t];
}