[LU-13910] return 0 if no error is found in mdt_path_current()

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Severity: 3
• Assignee: Emoly Liu
• Reporter: Emoly Liu

Description

Running "lfs fid2path" command always returns NULL on clients. confirm command works properly when run on server.
Running on client with lustre 2.11 and 2.12.3 always return NULL, eg:

[client]$ mount -t lustre
10.0.0.12@o2ib:10.0.1.12@o2ib:/lustre/home /home lustre rw,localflock,lazystatfs 0 0
[client]$ lfs path2fid /home/gsmith/lustre/test_file
[0x2400467ef:0x1da68:0x0]
[client]$ lfs fid2path /home [0x2400467ef:0x1da68:0x0]
/home//

Capturing the debug log from client while running command
client, eg:

000002:00000001:2.0:1593202672.215576:0:153435:0:(mdc_request.c:1964:mdc_iocontrol()) Process entered
00000002:00000010:2.0:1593202672.215577:0:153435:0:(mdc_request.c:1549:mdc_ioc_fid2path()) kmalloced 'key': 64 at ffff880b3f16a6c0.
00000002:00000080:2.0:1593202672.215579:0:153435:0:(mdc_request.c:1557:mdc_ioc_fid2path()) path get [0x2400467ef:0x1bb4d:0x0] from 18446744073709551615 #0
00000002:00000001:2.0:1593202672.215583:0:153435:0:(obd_class.h:501:obd_get_info()) Process entered
00000002:00000001:2.0:1593202672.215584:0:153435:0:(obd_class.h:488:exp_check_ops()) Process leaving (rc=0 : 0 : 0)
00000002:00000001:2.0:1593202672.215586:0:153435:0:(mdc_request.c:2085:mdc_get_info_rpc()) Process entered
--

00000100:00000001:4.0:1593202672.216681:0:153435:0:(client.c:2525:__ptlrpc_req_finished()) Process leaving (rc=1 : 1 : 1)
00000002:00000001:4.0:1593202672.216683:0:153435:0:(mdc_request.c:2124:mdc_get_info_rpc()) Process leaving (rc=56 : 56 : 38)
00000002:00000001:4.0:1593202672.216685:0:153435:0:(mdc_request.c:2349:mdc_get_info()) Process leaving (rc=56 : 56 : 38)
00000002:00000001:4.0:1593202672.216687:0:153435:0:(obd_class.h:515:obd_get_info()) Process leaving (rc=56 : 56 : 38)
00000002:00000001:4.0:1593202672.216688:0:153435:0:(mdc_request.c:1567:mdc_ioc_fid2path()) Process leaving via out (rc=56 : 56 : 0x38)
00000002:00000010:4.0:1593202672.216691:0:153435:0:(mdc_request.c:1581:mdc_ioc_fid2path()) kfreed 'key': 64 at ffff880b3f16a6c0.
00000002:00000001:4.0:1593202672.216693:0:153435:0:(mdc_request.c:1974:mdc_iocontrol()) Process leaving via out (rc=56 : 56 : 0x38)
00800000:00000001:4.0:1593202672.216695:0:153435:0:(obd_class.h:1240:obd_iocontrol()) Process leaving (rc=56 : 56 : 38)
00800000:00000001:4.0:1593202672.216697:0:153435:0:(lmv_obd.c:674:lmv_fid2path()) Process leaving via out_fid2path (rc=56 : 56 : 0x38)
00800000:00000001:4.0:1593202672.216700:0:153435:0:(lmv_obd.c:737:lmv_fid2path()) Process leaving (rc=56 : 56 : 38)
00800000:00000001:4.0:1593202672.216701:0:153435:0:(lmv_obd.c:1152:lmv_iocontrol()) Process leaving (rc=56 : 56 : 38)
00000080:00000001:4.0:1593202672.216703:0:153435:0:(obd_class.h:1240:obd_iocontrol()) Process leaving (rc=56 : 56 : 38)
00000080:00000001:4.0:1593202672.216705:0:153435:0:(file.c:2276:ll_fid2path()) Process leaving via gf_free (rc=56 : 56 : 0x38)
00000080:00000010:4.0:1593202672.216707:0:153435:0:(file.c:2282:ll_fid2path()) kfreed 'gfout': 4128 at ffff88100c452000.
00000080:00000001:4.0:1593202672.216709:0:153435:0:(file.c:2283:ll_fid2path()) Process leaving (rc=56 : 56 : 38)
00000080:00000001:4.0:1593202672.216711:0:153435:0:(dir.c:1585:ll_dir_ioctl()) Process leaving (rc=56 : 56 : 38)

Always return 0 if no error is found in mdt_path_current(), otherwise the non-zero value will be treated as an error and fid2path will return NULL.