[LU-4398] mdt_object_open_lock() may not flush conflicting handles

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.4
• Affects Version/s: Lustre 2.6.0, Lustre 2.5.1
• Labels: mdt
• Severity: 3
• Assignee: Gu Zheng (Inactive)
• Reporter: John Hammond

Description

Calls to mdt_object_open_lock() which do not have MDS_OPEN_LOCK in open flags may fail to flush conflicting handles.

t:~# rm /mnt/lustre/*
t:~# ls /mnt/lustre/
t:~# cp /bin/echo /mnt/lustre/echo
t:~# lfs path2fid /mnt/lustre/echo
[0x280000401:0x9:0x0]
t:~# /mnt/lustre/echo Hi
Hi
t:~# lctl clear
t:~# echo Bye > /mnt/lustre2/echo
-bash: /mnt/lustre2/echo: Text file busy
t:~# lctl dk > 2.dk

00000004:00000002:0.0:1387473999.026142:0:15064:0:(mdt_open.c:1610:mdt_reint_open()) I am going to open [0x200000007:0x1:0x0]/(echo->[0x280000402:0x4:0x0]) cr_flag=01102 mode=0100666 msg_flag=0x0

** There is a typo in the CDEBUG for the next message, the open count
** is really printed.

        CDEBUG(D_INODE, "normal open:"DFID" lease count: %d, lm: %d\n",
               PFID(mdt_object_fid(obj)),
               atomic_read(&obj->mot_open_count), lm);

00000004:00000002:0.0:1387473999.026365:0:15064:0:(mdt_open.c:1242:mdt_object_open_lock()) normal open:[0x280000401:0x9:0x0] lease count: 1, lm: 16

A CR LOOKUP LAYOUT is granted:

00000004:00000002:0.0:1387473999.026430:0:15064:0:(mdt_open.c:1269:mdt_object_open_lock()) Requested bits lock:[0x280000401:0x9:0x0], ibits = 0x9, open_flags = 01102, try_layout = 1, rc = 0
00000004:00000001:0.0:1387473999.026433:0:15064:0:(mdt_open.c:1332:mdt_object_open_lock()) Process leaving via out (rc=0 : 0 : 0x0)

00000004:00000001:0.0:1387473999.026456:0:15064:0:(mdt_open.c:536:mdt_write_get()) Process leaving (rc=18446744073709551590 : -26 : ffffffffffffffe6)
00000004:00000001:0.0:1387473999.026458:0:15064:0:(mdt_open.c:723:mdt_mfd_open()) Process leaving (rc=18446744073709551590 : -26 : ffffffffffffffe6)
00000004:00000001:0.0:1387473999.026459:0:15064:0:(mdt_open.c:994:mdt_finish_open()) Process leaving (rc=18446744073709551590 : -26 : ffffffffffffffe6)

Issue Links

• duplicates: LU-4773 "Text file busy" error when creating executables on NFS share and trying to run them on lustre clients
• is duplicated by: LU-4996 Interop 2.5.1<->2.6 failure on test suite sanityn test_14e: Text file busy
• is related to: LU-12661 sanity test_817: FAIL: failed to execute 'true' command
• is related to: LU-5197 A performance regression of "FileRead" metadata operation
• is related to: LU-4520 Text file busy error -- mainline 3.12 client
• is related to: LU-6232 Text file busy error -- lustre 2.6.0 client
• is related to: LU-10457 open_by_handle_at() in write mode triggers ETXTBSY
• is related to: LU-4671 sanity test_43: multiop still running
• is related to: LU-10948 client cache open lock after N opens
• is related to: LU-4152 layout locks can cause deadlock
• is related to: LU-10300 Can the Lustre 2.10.x clients support 64K kernel page?