@@ -628,6 +628,27 @@ 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;
+}
+
static int check_leaf_item(struct btrfs_root *root,
struct extent_buffer *leaf,
struct btrfs_key *key, int slot)
@@ -642,6 +663,9 @@ 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;
}
EXTENT_CSUM checker is a relatively easy checker, 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: Qu Wenruo <quwenruo.btrfs@gmx.com> --- fs/btrfs/disk-io.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+)