+ if (le32_to_cpu(es->s_rev_level) == EXT4_GOOD_OLD_REV) {
+ sbi->s_inode_size = EXT4_GOOD_OLD_INODE_SIZE;
+ sbi->s_first_ino = EXT4_GOOD_OLD_FIRST_INO;
+ } else {
+ sbi->s_inode_size = le16_to_cpu(es->s_inode_size);
+ sbi->s_first_ino = le32_to_cpu(es->s_first_ino);
+ if (sbi->s_first_ino < EXT4_GOOD_OLD_FIRST_INO) {
+ ext4_msg(sb, KERN_ERR, "invalid first ino: %u",
+ sbi->s_first_ino);
+ goto failed_mount;
+ }
+ if ((sbi->s_inode_size < EXT4_GOOD_OLD_INODE_SIZE) ||
+ (!is_power_of_2(sbi->s_inode_size)) ||
+ (sbi->s_inode_size > blocksize)) {
+ ext4_msg(sb, KERN_ERR,
+ "unsupported inode size: %d",
+ sbi->s_inode_size);
+ goto failed_mount;
+ }
+ /*
+ * i_atime_extra is the last extra field available for
+ * [acm]times in struct ext4_inode. Checking for that
+ * field should suffice to ensure we have extra space
+ * for all three.
+ */
+ if (sbi->s_inode_size >= offsetof(struct ext4_inode, i_atime_extra) +
+ sizeof(((struct ext4_inode *)0)->i_atime_extra)) {
+ sb->s_time_gran = 1;
+ sb->s_time_max = EXT4_EXTRA_TIMESTAMP_MAX;
+ } else {
+ sb->s_time_gran = NSEC_PER_SEC;
+ sb->s_time_max = EXT4_NON_EXTRA_TIMESTAMP_MAX;
+ }
+ sb->s_time_min = EXT4_TIMESTAMP_MIN;
+ }
+ if (sbi->s_inode_size > EXT4_GOOD_OLD_INODE_SIZE) {
+ sbi->s_want_extra_isize = sizeof(struct ext4_inode) -
+ EXT4_GOOD_OLD_INODE_SIZE;
+ if (ext4_has_feature_extra_isize(sb)) {
+ unsigned v, max = (sbi->s_inode_size -
+ EXT4_GOOD_OLD_INODE_SIZE);
+
+ v = le16_to_cpu(es->s_want_extra_isize);
+ if (v > max) {
+ ext4_msg(sb, KERN_ERR,
+ "bad s_want_extra_isize: %d", v);
+ goto failed_mount;
+ }
+ if (sbi->s_want_extra_isize < v)
+ sbi->s_want_extra_isize = v;
+
+ v = le16_to_cpu(es->s_min_extra_isize);
+ if (v > max) {
+ ext4_msg(sb, KERN_ERR,
+ "bad s_min_extra_isize: %d", v);
+ goto failed_mount;
+ }
+ if (sbi->s_want_extra_isize < v)
+ sbi->s_want_extra_isize = v;
+ }
+ }
+