[LU-14508] lfs mirror operations do not preserve timestamps

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Labels: bjhpflr
• Severity: 3
• Assignee: Zhenyu Xu
• Reporter: John Hammond

Description

lfs mirror extend -N sometimes causes the file atime to go backwards:

# echo XXX > f0; stat f0; sleep 60; cat f0; stat f0; sleep 60; date; lfs mirror extend -N -p ddn_hdd f0; stat f0
  File: ‘f0’
  Size: 4         	Blocks: 1          IO Block: 4194304 regular file
Device: 2c54f966h/743766374d	Inode: 144115205289279491  Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2021-03-10 10:17:48.000000000 -0600
Modify: 2021-03-10 10:17:48.000000000 -0600
Change: 2021-03-10 10:17:48.000000000 -0600
 Birth: -
XXX
  File: ‘f0’
  Size: 4         	Blocks: 8          IO Block: 4194304 regular file
Device: 2c54f966h/743766374d	Inode: 144115205289279491  Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2021-03-10 10:18:48.000000000 -0600
Modify: 2021-03-10 10:17:48.000000000 -0600
Change: 2021-03-10 10:17:48.000000000 -0600
 Birth: -
Wed Mar 10 10:19:48 CST 2021
  File: ‘f0’
  Size: 4         	Blocks: 8          IO Block: 4194304 regular file
Device: 2c54f966h/743766374d	Inode: 144115205289279491  Links: 1
Access: (0644/-rw-r--r--)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2021-03-10 10:17:48.000000000 -0600
Modify: 2021-03-10 10:17:48.000000000 -0600
Change: 2021-03-10 10:17:48.000000000 -0600
 Birth: -

Issue Links

• duplicates: LU-15557 creating/breaking mirror should not change file timestamps
• is related to: LU-14526 SoM xattr not updated after mirror split