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.bt...@gmx.com> --- fs/btrfs/disk-io.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index b92296c6a698..1746c5a2a7f7 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -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; } -- 2.14.1 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html