[LU-7107] lfs_migrate() may fail in striped directories

• Type: Bug
• Resolution: Duplicate
• Priority: Critical
• Affects Version/s: Lustre 2.8.0
• Labels: dne2 lfs utils
• Severity: 3
• Assignee: WC Triage
• Reporter: John Hammond

Description

lfs migrate may fail when applied to files in a striped directory:

# export MDSCOUNT=4
# llmount.sh 
...
# cd /mnt/lustre
# lfs mkdir -i0 -c2 d0
# cd d0
# lfs setstripe -c2 f0
# lfs path2fid f0
[0x240000404:0x1:0x0]
# lfs migrate -c1 f0
lfs: f0: cannot swap layouts: Device or resource busy
cannot put lease: No locks available (37)
error: migrate: migrate file 'f0' failed
# lfs setstripe -c2 f1
# lfs path2fid f1
[0x200000404:0x3:0x0]
# lfs migrate -c1 f1
# lfs setstripe -c2 f2
# lfs path2fid f2
[0x240000404:0x2:0x0]
# lfs migrate -c1 f2
lfs: f2: cannot swap layouts: Device or resource busy
cannot put lease: No locks available (37)
error: migrate: migrate file 'f2' failed

In lfs_migrate() we must get the MDT index of the file to be migrated and use that when constructing the name of the volatile file.

Issue Links

• is related to: LU-6831 The ticket for tracking all DNE2 bugs