[LU-17810] lfs migrate -m leaves 1-stripe dir in a two-level "striped" form

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.17.0
• Severity: 3
• Assignee: Alexander Zarochentsev
• Reporter: Alexander Zarochentsev

Description

lfs migrate -m leaves 1-stripe dir in a two-level "striped" form:

[root@rocky tests]# mkdir /mnt/lustre/migrate-test
[root@rocky tests]# ../utils/lfs getdirstripe /mnt/lustre/migrate-test/
lmv_stripe_count: 0 lmv_stripe_offset: 0 lmv_hash_type: none
[root@rocky tests]# ../utils/lfs migrate -m 1 /mnt/lustre/migrate-test/
[root@rocky tests]# ../utils/lfs getdirstripe /mnt/lustre/migrate-test/
lmv_stripe_count: 1 lmv_stripe_offset: 1 lmv_hash_type: crush,fixed
mdtidx		 FID[seq:oid:ver]
     1		 [0x240000400:0x2:0x0]		
[root@rocky tests]# ../utils/lfs path2fid /mnt/lustre/migrate-test/
[0x240000402:0x1:0x0]
[root@rocky tests]# debugfs -R "ls -l /REMOTE_PARENT_DIR/0x240000402:0x1:0x0" /dev/mapper/mds2_flakey 
debugfs 1.46.2.wc5 (26-Mar-2022)
  25047   40755 (2)      0      0    4096  3-May-2024 15:41 .
  25001   40755 (18)      0      0    4096  3-May-2024 15:42 ..
  25048   40755 (18)      0      0    4096  3-May-2024 15:41 [0x240000400:0x2:0x0]:0

[root@rocky tests]# 

the migration process does not end by a conversion the result dir into "plain" ldiskfs dir.
The dir is accessible, it is possible to create and delete files in the dir and remove the dir itself w/o problems.

Issue Links

• is related to: LU-17575 Require specific enable flag for lfs migrate -m (directory migration)