Details
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Bug
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Resolution: Unresolved
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Major
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None
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None
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None
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3
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9223372036854775807
Description
There is a way to get name duplicates in a striped dir:
Suppose an app either have a CWD in some plain dir or have an open file descriptor for that dir.
After that, the dir is being migrated and has converted to a striped form for performing the migration.
The initial plain dir is now a stripe of the striped dir, and the app still has a possibility to create objects in the that stripe
not caring about uniqueness of the file names across the whole striped dir.
Here is an example:
Session1: creating a test dir:
[root@rocky ~]# mkdir /mnt/lustre/testdir [root@rocky ~]#
Session2: in another session changing working directory to /mnt/lustre/testdir:
[root@rocky ~]# cd /mnt/lustre/testdir/ [root@rocky testdir]#
Session1: starting and interrupting dir migration (using gdb):
touch /mnt/lustre/testdir/foo-{01..20}
LD_LIBRARY_PATH=$PWD/../utils/.libs/:$PWD/../../lnet/utils/.libs/:$PWD/../../lnet/utils/lnetconfig/.libs gdb ../utils/.libs/lfs << EOF
break llapi_migrate_mdt
run migrate -m 1 /mnt/lustre/testdir
break cb_migrate_mdt_init
continue
continue
continue
continue
continue
continue
continue
continue
EOF
....
[root@rocky tests]# ../utils/lfs getdirstripe /mnt/lustre/testdir/
lmv_stripe_count: 2 lmv_stripe_offset: 1 lmv_hash_type: crush,migrating
mdtidx FID[seq:oid:ver]
1 [0x240002341:0x6:0x0]
1 [0x240002340:0x1f:0x0]
[root@rocky tests]#
Session1: creating a subdir :
[root@rocky tests]# mkdir /mnt/lustre/testdir/a_duplicated_dir [root@rocky tests]#
in another session, doing the same
Session2:
[root@rocky testdir]# mkdir a_duplicated_dir [root@rocky testdir]#
in Session1, checking the result:
[root@rocky tests]# ls -l /mnt/lustre/testdir/ total 8 drwxr-xr-x 2 root root 4096 Mar 20 22:01 a_duplicated_dir drwxr-xr-x 2 root root 4096 Mar 20 22:01 a_duplicated_dir -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-01 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-02 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-03 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-04 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-05 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-06 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-07 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-08 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-09 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-10 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-11 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-12 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-13 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-14 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-15 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-16 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-17 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-18 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-19 -rw-r--r-- 1 root root 0 Mar 20 21:59 foo-20 [root@rocky tests]#