[LU-17136] ext4 extent tree: increase max depth

• Type: Improvement
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.16.0
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

With some unusual workloads, it is possible for the ldiskfs extent index tree to grow larger than 5 levels deep, and remount the OST read-only as with an error.

Apr 27 10:32:53 oss7 kernel: LDISKFS-fs error (device sdb): ldiskfs_ext_find_extent:858: inode #20530609: comm ll_ost_io06_005: inode has invalid extent depth: 6
Apr 27 10:32:53 oss7 kernel: Aborting journal on device sdb-8.
Apr 27 10:32:53 oss7 kernel: LDISKFS-fs (sdb): Remounting filesystem read-only

Issue Links

• is related to: LU-16843 ext4 extent tree should be able to shrink