[LU-12609] Limit maximum number of journal credits for an RPC

• Type: Bug
• Resolution: Unresolved
• Priority: Minor
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Patrick Farrell (Inactive)

Description

It is important to limit the total number of fragments allowed in an RPC to avoid issues with the on disk file system which can occur with too many fragments.

For example:

May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1155:osd_trans_dump_creds())   create: 0/0/0, destroy: 0/0/0
May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1155:osd_trans_dump_creds()) Skipped 4 previous similar messages
May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1162:osd_trans_dump_creds())   attr_set: 1/1/0, xattr_set: 1/1/0
May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1162:osd_trans_dump_creds()) Skipped 4 previous similar messages
May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1172:osd_trans_dump_creds())   write: 2/17434/0, punch: 0/0/0, quota 5/5/0
May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1172:osd_trans_dump_creds()) Skipped 4 previous similar messages
May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1179:osd_trans_dump_creds())   insert: 0/0/0, delete: 0/0/0
May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1179:osd_trans_dump_creds()) Skipped 4 previous similar messages
May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1186:osd_trans_dump_creds())   ref_add: 0/0/0, ref_del: 0/0/0
May 27 03:21:02 oss2c104 kernel: Lustre: 5711:0:(osd_handler.c:1186:osd_trans_dump_creds()) Skipped 4 previous similar messages
May 27 03:21:02 oss2c104 kernel: LustreError: 5711:0:(osd_internal.h:1117:osd_trans_exec_op()) share1-OST004c-osd: op = 7, rb = 7
May 27 03:21:02 oss2c104 kernel: LustreError: 5711:0:(osd_internal.h:1117:osd_trans_exec_op()) Skipped 3 previous similar messages
May 27 03:21:02 oss2c104 kernel: Pid: 5856, comm: ll_ost_io01_044
May 27 03:21:02 oss2c104 kernel: \x0aCall Trace:
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc074680e>] libcfs_call_trace+0x4e/0x60 [libcfs]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0746846>] libcfs_debug_dumpstack+0x26/0x30 [libcfs]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0e3fcfd>] osd_trans_start+0x36d/0x390 [osd_ldiskfs]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0f964fe>] ofd_trans_start+0x6e/0xf0 [ofd]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0f9cc63>] ofd_commitrw_write+0x943/0x1d90 [ofd]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0fa100b>] ofd_commitrw+0x54b/0xb70 [ofd]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0bd39d6>] obd_commitrw.constprop.39+0x2fe/0x341 [ptlrpc]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0bc02e0>] tgt_brw_write+0xd60/0x16d0 [ptlrpc]
May 27 03:21:02 oss2c104 kernel:  [<ffffffff810d11c4>] ? update_curr+0x104/0x190
May 27 03:21:02 oss2c104 kernel:  [<ffffffff810cdbce>] ? account_entity_dequeue+0xae/0xd0
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0b0a650>] ? target_bulk_timeout+0x0/0xb0 [ptlrpc]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0bbc460>] tgt_request_handle+0x900/0x11f0 [ptlrpc]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0b5edc0>] ptlrpc_server_handle_request+0x220/0xa90 [ptlrpc]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0758818>] ? lc_watchdog_touch+0x68/0x180 [libcfs]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0b5b938>] ? ptlrpc_wait_event+0x98/0x330 [ptlrpc]
May 27 03:21:02 oss2c104 kernel:  [<ffffffff810bdc4b>] ? __wake_up_common+0x5b/0x90
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0b6278f>] ptlrpc_main+0xc3f/0x1fa0 [ptlrpc]
May 27 03:21:02 oss2c104 kernel:  [<ffffffffc0b61b50>] ? ptlrpc_main+0x0/0x1fa0 [ptlrpc]
May 27 03:21:02 oss2c104 kernel:  [<ffffffff810b4031>] kthread+0xd1/0xe0
May 27 03:21:02 oss2c104 kernel:  [<ffffffff810b3f60>] ? kthread+0x0/0xe0
May 27 03:21:02 oss2c104 kernel:  [<ffffffff816c1577>] ret_from_fork+0x77/0xb0
May 27 03:21:02 oss2c104 kernel:  [<ffffffff810b3f60>] ? kthread+0x0/0xe0