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btrfs: check for supported superblock checksum type before checksum validation

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Now that we have factorerd out the superblock checksum type validation,
we can check for supported superblock checksum types before doing the
actual validation of the superblock read from disk.

This leads the path to further simplifications of
btrfs_check_super_csum() later on.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add comment ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2019-06-03 16:58:54 +02:00 committed by David Sterba
parent e7e16f4882
commit 8dc3f22c8b
1 changed files with 14 additions and 0 deletions
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14
fs/btrfs/disk-io.c
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@ -2816,6 +2816,20 @@ int open_ctree(struct super_block *sb,
goto fail_alloc;
}
/*
* Verify the type first, if that or the the checksum value are
* corrupted, we'll find out
*/
if (!btrfs_supported_super_csum(btrfs_super_csum_type(
(struct btrfs_super_block *) bh->b_data))) {
btrfs_err(fs_info, "unsupported checksum algorithm: %u",
btrfs_super_csum_type((struct btrfs_super_block *)
bh->b_data));
err = -EINVAL;
brelse(bh);
goto fail_alloc;
}
/*
* We want to check superblock checksum, the type is stored inside.
* Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k).