-/* somewhat more expensive than our other checks, so use sparingly. */
-static int ocfs2_check_group_descriptor(struct super_block *sb,
- struct ocfs2_dinode *di,
- struct ocfs2_group_desc *gd)
-{
- unsigned int max_bits;
-
- if (!OCFS2_IS_VALID_GROUP_DESC(gd)) {
- OCFS2_RO_ON_INVALID_GROUP_DESC(sb, gd);
- return -EIO;
- }
-
- if (di->i_blkno != gd->bg_parent_dinode) {
- ocfs2_error(sb, "Group descriptor # %llu has bad parent "
- "pointer (%llu, expected %llu)",
- (unsigned long long)le64_to_cpu(gd->bg_blkno),
- (unsigned long long)le64_to_cpu(gd->bg_parent_dinode),
- (unsigned long long)le64_to_cpu(di->i_blkno));
- return -EIO;
- }
-
- max_bits = le16_to_cpu(di->id2.i_chain.cl_cpg) * le16_to_cpu(di->id2.i_chain.cl_bpc);
- if (le16_to_cpu(gd->bg_bits) > max_bits) {
- ocfs2_error(sb, "Group descriptor # %llu has bit count of %u",
- (unsigned long long)le64_to_cpu(gd->bg_blkno),
- le16_to_cpu(gd->bg_bits));
- return -EIO;
- }
-
- if (le16_to_cpu(gd->bg_chain) >=
- le16_to_cpu(di->id2.i_chain.cl_next_free_rec)) {
- ocfs2_error(sb, "Group descriptor # %llu has bad chain %u",
- (unsigned long long)le64_to_cpu(gd->bg_blkno),
- le16_to_cpu(gd->bg_chain));
- return -EIO;
- }
-
- if (le16_to_cpu(gd->bg_free_bits_count) > le16_to_cpu(gd->bg_bits)) {
- ocfs2_error(sb, "Group descriptor # %llu has bit count %u but "
- "claims that %u are free",
- (unsigned long long)le64_to_cpu(gd->bg_blkno),
- le16_to_cpu(gd->bg_bits),
- le16_to_cpu(gd->bg_free_bits_count));
- return -EIO;
- }
-
- if (le16_to_cpu(gd->bg_bits) > (8 * le16_to_cpu(gd->bg_size))) {
- ocfs2_error(sb, "Group descriptor # %llu has bit count %u but "
- "max bitmap bits of %u",
- (unsigned long long)le64_to_cpu(gd->bg_blkno),
- le16_to_cpu(gd->bg_bits),
- 8 * le16_to_cpu(gd->bg_size));
- return -EIO;
- }
-
- return 0;
-}
-