[LU-13672] tune2fs leaves MMP block in inconsistent state on error

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Labels: e2fsprogs
• Severity: 3
• Assignee: Andreas Dilger
• Reporter: Andreas Dilger

Description

Running "tune2fs -O project" on the MGS fails because it may be formatted with 128-byte inode size if smaller than 512MB in size. This prevents the "project" feature from being used because there is no extended inode space to hold the project ID.

As a result, tune2fs exits without resetting the MMP block to an "unused" state, and this prevents the filesystem from being mounted, with an error:

LDISKFS-fs warning (device dm-9): ldiskfs_multi_mount_protect:311: fsck is running on the filesystem 
LDISKFS-fs warning (device dm-9): ldiskfs_multi_mount_protect:311: MMP failure
     info: last update time: 1591374065, last update node: mds-9-0,
     last update device: /dev/mapper/vg_mgs-mgs