Commit 64948fd6 authored by Qu Wenruo's avatar Qu Wenruo Committed by Greg Kroah-Hartman

btrfs: Add checker for EXTENT_CSUM

commit 4b865cab upstream.

EXTENT_CSUM checker is a relatively easy one, only needs to check:

1) Objectid
   Fixed to BTRFS_EXTENT_CSUM_OBJECTID

2) Key offset alignment
   Must be aligned to sectorsize

3) Item size alignedment
   Must be aligned to csum size
Signed-off-by: default avatarQu Wenruo <quwenruo.btrfs@gmx.com>
Reviewed-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarBen Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent fa5d29e6
......@@ -627,6 +627,27 @@ static int check_extent_data_item(struct btrfs_root *root,
return 0;
}
static int check_csum_item(struct btrfs_root *root, struct extent_buffer *leaf,
struct btrfs_key *key, int slot)
{
u32 sectorsize = root->fs_info->sectorsize;
u32 csumsize = btrfs_super_csum_size(root->fs_info->super_copy);
if (key->objectid != BTRFS_EXTENT_CSUM_OBJECTID) {
CORRUPT("invalid objectid for csum item", leaf, root, slot);
return -EUCLEAN;
}
if (!IS_ALIGNED(key->offset, sectorsize)) {
CORRUPT("unaligned key offset for csum item", leaf, root, slot);
return -EUCLEAN;
}
if (!IS_ALIGNED(btrfs_item_size_nr(leaf, slot), csumsize)) {
CORRUPT("unaligned csum item size", leaf, root, slot);
return -EUCLEAN;
}
return 0;
}
/*
* Common point to switch the item-specific validation.
*/
......@@ -640,6 +661,9 @@ static int check_leaf_item(struct btrfs_root *root,
case BTRFS_EXTENT_DATA_KEY:
ret = check_extent_data_item(root, leaf, key, slot);
break;
case BTRFS_EXTENT_CSUM_KEY:
ret = check_csum_item(root, leaf, key, slot);
break;
}
return ret;
}
......
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