[LU-2754] rename from MDT1 to MDT0 sometimes appears to succeed but does not

• Type: Technical task
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.4.0
• Labels: LB dne
• Environment: 2.3.60-50-g75ae281
• Assignee: Di Wang
• Reporter: John Hammond

Description

Here sys_rename is a trivial program that just calls rename(argv[1], argv[2]) and check for error.

# export MDSCOUNT=2
# llmount.sh
# cd /mnt/lustre
# find .
.
./.lustre
# lfs mkdir -i 1 m1
# echo 0 > f0
# echo 1 > m1/f1
# find .
.
./f0
./m1
./m1/f1
./.lustre
# sys_rename m1/f1 f0
# find .
.
./f0
./m1
./.lustre
# cat f0
0
# rm f0

In the same situation I can get a simple rename or rename-onto an existing directory on MDT0 to return succeess but lose the old dir.

# find .
.
./m1
./.lustre
# mkdir d0
# mkdir m1/d1
# touch m1/d1/f1
# find .
.
./d0
./m1
./m1/d1
./m1/d1/f1
./.lustre
# sys_rename m1/d1 d0
# find .
.
./d0
./m1
./.lustre
#

Rename onto may require several attempts:

# mkdir d0
# mkdir m1/d1
# touch m1/d1/f0
# find .
.
./d0
./m1
./m1/d1
./m1/d1/f0
./.lustre
# sys_rename m1/d1 d0
cannot rename `m1/d1' to `d0': Directory not empty
# sys_rename m1/d1 d0
cannot rename `m1/d1' to `d0': Directory not empty
# mkdir d2
#
# sys_rename m1/d1 d2
cannot rename `m1/d1' to `d2': Directory not empty
# sys_rename m1/d1 d2
cannot rename `m1/d1' to `d2': Directory not empty
# find .
.
./d0
./d2
./m1
./m1/d1
./m1/d1/f0
./.lustre
# mkdir d3
# sys_rename m1/d1 d3
# find .
.
./d0
./d2
./m1
./d3
./.lustre

Issue Links

• duplicates: LU-2240 implement index range lookup for osd-zfs.
• is duplicated by: LU-2773 remote directories cannot be removed by "rm -r"
• is duplicated by: LU-2755 calling rmdir on remote directory returns -ENOENT instead of -EBUSY