[LU-14526] SoM xattr not updated after mirror split

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

Description

After mirror split, a file may have a "STRICT" size on MDT xattr which actually stale:

# rm -f f0
# dd if=/dev/zero of=f0 bs=1M count=100
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.802629 s, 131 MB/s
# sync
# du --block-size=512 f0
204800  f0
#
# lfs mirror extend -N -c1 f0
# sync
# du --block-size=512 f0
395264  f0
#
# lfs mirror split --delete --mirror-id=1 f0
# sync
# du --block-size=512 f0
395264  f0
#
# # lfs getsom f0
file: f0 size: 104857600 blocks: 395264 flags: 1
# getfattr -n trusted.som --only-values f0 | hexdump -C
00000000  01 00 00 00 00 00 00 00  00 00 40 06 00 00 00 00  |..........@.....|
00000010  00 08 06 00 00 00 00 00                           |........|
00000018
#
# echo $((0x060800))
395264

Issue Links

• has to be finished together with: LU-14549 getxattr for lustre.lov and trusted.lov sometimes wrong after mirror split
• is related to: LU-14765 sanity-flr test_44c: mirror split does not reduce block#
• is related to: LU-14508 lfs mirror operations do not preserve timestamps