+ * slot == -1: SYSTEM chunk
+ * return -EIO on error, otherwise return 0
+ */
+int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
+ struct extent_buffer *leaf,
+ struct btrfs_chunk *chunk,
+ int slot, u64 logical)
+{
+ u64 length;
+ u64 stripe_len;
+ u16 num_stripes;
+ u16 sub_stripes;
+ u64 type;
+ u32 chunk_ondisk_size;
+ u32 sectorsize = fs_info->sectorsize;
+
+ length = btrfs_chunk_length(leaf, chunk);
+ stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
+ num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
+ sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
+ type = btrfs_chunk_type(leaf, chunk);
+
+ /*
+ * These valid checks may be insufficient to cover every corner cases.
+ */
+ if (!IS_ALIGNED(logical, sectorsize)) {
+ error("invalid chunk logical %llu", logical);
+ return -EIO;
+ }
+ if (btrfs_chunk_sector_size(leaf, chunk) != sectorsize) {
+ error("invalid chunk sectorsize %llu",
+ (unsigned long long)btrfs_chunk_sector_size(leaf, chunk));
+ return -EIO;
+ }
+ if (!length || !IS_ALIGNED(length, sectorsize)) {
+ error("invalid chunk length %llu", length);
+ return -EIO;
+ }
+ if (stripe_len != BTRFS_STRIPE_LEN) {
+ error("invalid chunk stripe length: %llu", stripe_len);
+ return -EIO;
+ }
+ /* Check on chunk item type */
+ if (slot == -1 && (type & BTRFS_BLOCK_GROUP_SYSTEM) == 0) {
+ error("invalid chunk type %llu", type);
+ return -EIO;
+ }
+ if (type & ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
+ BTRFS_BLOCK_GROUP_PROFILE_MASK)) {
+ error("unrecognized chunk type: %llu",
+ ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
+ BTRFS_BLOCK_GROUP_PROFILE_MASK) & type);
+ return -EIO;
+ }
+ if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
+ error("missing chunk type flag: %llu", type);
+ return -EIO;
+ }
+ if (!(is_power_of_2(type & BTRFS_BLOCK_GROUP_PROFILE_MASK) ||
+ (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)) {
+ error("conflicting chunk type detected: %llu", type);
+ return -EIO;
+ }
+ if ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) &&
+ !is_power_of_2(type & BTRFS_BLOCK_GROUP_PROFILE_MASK)) {
+ error("conflicting chunk profile detected: %llu", type);
+ return -EIO;
+ }
+
+ chunk_ondisk_size = btrfs_chunk_item_size(num_stripes);
+ /*
+ * Btrfs_chunk contains at least one stripe, and for sys_chunk
+ * it can't exceed the system chunk array size
+ * For normal chunk, it should match its chunk item size.
+ */
+ if (num_stripes < 1 ||
+ (slot == -1 && chunk_ondisk_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) ||
+ (slot >= 0 && chunk_ondisk_size > btrfs_item_size_nr(leaf, slot))) {
+ error("invalid num_stripes: %u", num_stripes);
+ return -EIO;
+ }
+ /*
+ * Device number check against profile
+ */
+ if ((type & BTRFS_BLOCK_GROUP_RAID10 && (sub_stripes != 2 ||
+ !IS_ALIGNED(num_stripes, sub_stripes))) ||
+ (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes < 1) ||
+ (type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) ||
+ (type & BTRFS_BLOCK_GROUP_RAID6 && num_stripes < 3) ||
+ (type & BTRFS_BLOCK_GROUP_DUP && num_stripes > 2) ||
+ ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 &&
+ num_stripes != 1)) {
+ error("Invalid num_stripes:sub_stripes %u:%u for profile %llu",
+ num_stripes, sub_stripes,
+ type & BTRFS_BLOCK_GROUP_PROFILE_MASK);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/*
+ * Slot is used to verify the chunk item is valid