1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
40 #if defined(__linux__)
41 #include <linux/lustre_net.h>
42 #elif defined(__APPLE__)
43 #include <darwin/lustre_net.h>
44 #elif defined(__WINNT__)
45 #include <winnt/lustre_net.h>
47 #error Unsupported operating system.
50 #include <libcfs/kp30.h>
52 #include <lnet/lnet.h>
53 #include <lustre/lustre_idl.h>
54 #include <lustre_ha.h>
55 #include <lustre_import.h>
56 #include <lprocfs_status.h>
58 #include <obd_support.h>
60 /* MD flags we _always_ use */
61 #define PTLRPC_MD_OPTIONS 0
63 /* Define maxima for bulk I/O
64 * CAVEAT EMPTOR, with multinet (i.e. routers forwarding between networks)
65 * these limits are system wide and not interface-local. */
66 #define PTLRPC_MAX_BRW_BITS LNET_MTU_BITS
67 #define PTLRPC_MAX_BRW_SIZE (1<<LNET_MTU_BITS)
68 #define PTLRPC_MAX_BRW_PAGES (PTLRPC_MAX_BRW_SIZE >> CFS_PAGE_SHIFT)
70 /* When PAGE_SIZE is a constant, we can check our arithmetic here with cpp! */
72 # if ((PTLRPC_MAX_BRW_PAGES & (PTLRPC_MAX_BRW_PAGES - 1)) != 0)
73 # error "PTLRPC_MAX_BRW_PAGES isn't a power of two"
75 # if (PTLRPC_MAX_BRW_SIZE != (PTLRPC_MAX_BRW_PAGES * CFS_PAGE_SIZE))
76 # error "PTLRPC_MAX_BRW_SIZE isn't PTLRPC_MAX_BRW_PAGES * CFS_PAGE_SIZE"
78 # if (PTLRPC_MAX_BRW_SIZE > LNET_MTU)
79 # error "PTLRPC_MAX_BRW_SIZE too big"
81 # if (PTLRPC_MAX_BRW_PAGES > LNET_MAX_IOV)
82 # error "PTLRPC_MAX_BRW_PAGES too big"
84 #endif /* __KERNEL__ */
86 /* Size over which to OBD_VMALLOC() rather than OBD_ALLOC() service request
88 #define SVC_BUF_VMALLOC_THRESHOLD (2 * CFS_PAGE_SIZE)
90 /* The following constants determine how memory is used to buffer incoming
93 * ?_NBUFS # buffers to allocate when growing the pool
94 * ?_BUFSIZE # bytes in a single request buffer
95 * ?_MAXREQSIZE # maximum request service will receive
97 * When fewer than ?_NBUFS/2 buffers are posted for receive, another chunk
98 * of ?_NBUFS is added to the pool.
100 * Messages larger than ?_MAXREQSIZE are dropped. Request buffers are
101 * considered full when less than ?_MAXREQSIZE is left in them.
104 #define LDLM_THREADS_AUTO_MIN (2)
105 #define LDLM_THREADS_AUTO_MAX min_t(unsigned, num_online_cpus()*num_online_cpus()*32, 128)
106 #define LDLM_BL_THREADS LDLM_THREADS_AUTO_MIN
107 #define LDLM_NBUFS (64 * num_online_cpus())
108 #define LDLM_BUFSIZE (8 * 1024)
109 #define LDLM_MAXREQSIZE (5 * 1024)
110 #define LDLM_MAXREPSIZE (1024)
112 /* Absolute limits */
113 #define MDS_THREADS_MIN 2
114 #define MDS_THREADS_MAX 512
115 #define MDS_THREADS_MIN_READPAGE 2
116 #define MDS_NBUFS (64 * num_online_cpus())
117 #define MDS_BUFSIZE (8 * 1024)
118 /* Assume file name length = FNAME_MAX = 256 (true for ext3).
119 * path name length = PATH_MAX = 4096
120 * LOV MD size max = EA_MAX = 4000
121 * symlink: FNAME_MAX + PATH_MAX <- largest
122 * link: FNAME_MAX + PATH_MAX (mds_rec_link < mds_rec_create)
123 * rename: FNAME_MAX + FNAME_MAX
124 * open: FNAME_MAX + EA_MAX
126 * MDS_MAXREQSIZE ~= 4736 bytes =
127 * lustre_msg + ldlm_request + mds_body + mds_rec_create + FNAME_MAX + PATH_MAX
128 * MDS_MAXREPSIZE ~= 8300 bytes = lustre_msg + llog_header
129 * or, for mds_close() and mds_reint_unlink() on a many-OST filesystem:
130 * = 9210 bytes = lustre_msg + mds_body + 160 * (easize + cookiesize)
132 * Realistic size is about 512 bytes (20 character name + 128 char symlink),
133 * except in the open case where there are a large number of OSTs in a LOV.
135 #define MDS_MAXREQSIZE (5 * 1024)
136 #define MDS_MAXREPSIZE max(9 * 1024, 362 + LOV_MAX_STRIPE_COUNT * 56)
138 #define MGS_THREADS_AUTO_MIN 2
139 #define MGS_THREADS_AUTO_MAX 32
140 #define MGS_NBUFS (64 * num_online_cpus())
141 #define MGS_BUFSIZE (8 * 1024)
142 #define MGS_MAXREQSIZE (8 * 1024)
143 #define MGS_MAXREPSIZE (9 * 1024)
145 /* Absolute limits */
146 #define OSS_THREADS_MIN 3 /* difficult replies, HPQ, others */
147 #define OSS_THREADS_MAX 512
148 #define OST_NBUFS (64 * num_online_cpus())
149 #define OST_BUFSIZE (8 * 1024)
150 /* OST_MAXREQSIZE ~= 4768 bytes =
151 * lustre_msg + obdo + 16 * obd_ioobj + 256 * niobuf_remote
153 * - single object with 16 pages is 512 bytes
154 * - OST_MAXREQSIZE must be at least 1 page of cookies plus some spillover
156 #define OST_MAXREQSIZE (5 * 1024)
157 #define OST_MAXREPSIZE (9 * 1024)
159 /* Macro to hide a typecast. */
160 #define ptlrpc_req_async_args(req) ((void *)&req->rq_async_args)
162 struct ptlrpc_connection {
163 struct hlist_node c_hash;
165 lnet_process_id_t c_peer;
166 struct obd_uuid c_remote_uuid;
170 struct ptlrpc_client {
171 __u32 cli_request_portal;
172 __u32 cli_reply_portal;
176 /* state flags of requests */
177 /* XXX only ones left are those used by the bulk descs as well! */
178 #define PTL_RPC_FL_INTR (1 << 0) /* reply wait was interrupted by user */
179 #define PTL_RPC_FL_TIMEOUT (1 << 7) /* request timed out waiting for reply */
181 #define REQ_MAX_ACK_LOCKS 8
183 union ptlrpc_async_args {
184 /* Scratchpad for passing args to completion interpreter. Users
185 * cast to the struct of their choosing, and LASSERT that this is
186 * big enough. For _tons_ of context, OBD_ALLOC a struct and store
187 * a pointer to it here. The pointer_arg ensures this struct is at
188 * least big enough for that. */
189 void *pointer_arg[9];
193 struct ptlrpc_request_set;
194 typedef int (*set_interpreter_func)(struct ptlrpc_request_set *, void *, int);
196 struct ptlrpc_request_set {
197 int set_remaining; /* # uncompleted requests */
198 cfs_waitq_t set_waitq;
199 cfs_waitq_t *set_wakeup_ptr;
200 struct list_head set_requests;
201 struct list_head set_cblist; /* list of completion callbacks */
202 set_interpreter_func set_interpret; /* completion callback */
203 void *set_arg; /* completion context */
204 /* locked so that any old caller can communicate requests to
205 * the set holder who can then fold them into the lock-free set */
206 spinlock_t set_new_req_lock;
207 struct list_head set_new_requests;
210 struct ptlrpc_set_cbdata {
211 struct list_head psc_item;
212 set_interpreter_func psc_interpret;
216 struct ptlrpc_bulk_desc;
219 * ptlrpc callback & work item stuff
221 struct ptlrpc_cb_id {
222 void (*cbid_fn)(lnet_event_t *ev); /* specific callback fn */
223 void *cbid_arg; /* additional arg */
226 #define RS_MAX_LOCKS 4
229 struct ptlrpc_reply_state {
230 struct ptlrpc_cb_id rs_cb_id;
231 struct list_head rs_list;
232 struct list_head rs_exp_list;
233 struct list_head rs_obd_list;
235 struct list_head rs_debug_list;
237 /* updates to following flag serialised by srv_request_lock */
238 unsigned long rs_difficult:1; /* ACK/commit stuff */
239 unsigned long rs_scheduled:1; /* being handled? */
240 unsigned long rs_scheduled_ever:1;/* any schedule attempts? */
241 unsigned long rs_handled:1; /* been handled yet? */
242 unsigned long rs_on_net:1; /* reply_out_callback pending? */
243 unsigned long rs_prealloc:1; /* rs from prealloc list */
248 struct obd_export *rs_export;
249 struct ptlrpc_service *rs_service;
250 lnet_handle_md_t rs_md_h;
251 atomic_t rs_refcount;
253 /* locks awaiting client reply ACK */
255 struct lustre_handle rs_locks[RS_MAX_LOCKS];
256 ldlm_mode_t rs_modes[RS_MAX_LOCKS];
257 /* last member: variable sized reply message */
258 struct lustre_msg *rs_msg;
261 struct ptlrpc_thread;
264 RQ_PHASE_NEW = 0xebc0de00,
265 RQ_PHASE_RPC = 0xebc0de01,
266 RQ_PHASE_BULK = 0xebc0de02,
267 RQ_PHASE_INTERPRET = 0xebc0de03,
268 RQ_PHASE_COMPLETE = 0xebc0de04,
269 RQ_PHASE_UNREGISTERING = 0xebc0de05,
270 RQ_PHASE_UNDEFINED = 0xebc0de06
273 struct ptlrpc_request_pool {
275 struct list_head prp_req_list; /* list of ptlrpc_request structs */
277 void (*prp_populate)(struct ptlrpc_request_pool *, int);
282 struct ptlrpc_hpreq_ops {
284 * Check if the lock handle of the given lock is the same as
285 * taken from the request.
287 int (*hpreq_lock_match)(struct ptlrpc_request *, struct ldlm_lock *);
289 * Check if the request is a high priority one.
291 int (*hpreq_check)(struct ptlrpc_request *);
294 struct ptlrpc_request {
295 int rq_type; /* one of PTL_RPC_MSG_* */
296 struct list_head rq_list;
297 struct list_head rq_timed_list; /* server-side early replies */
298 struct list_head rq_history_list; /* server-side history */
299 struct list_head rq_exp_list; /* server-side per-export list */
300 struct ptlrpc_hpreq_ops *rq_ops; /* server-side hp handlers */
302 __u64 rq_history_seq; /* history sequence # */
303 /* the index of service's srv_at_array into which request is linked */
307 /* client-side flags are serialized by rq_lock */
308 unsigned long rq_intr:1, rq_replied:1, rq_err:1,
309 rq_timedout:1, rq_resend:1, rq_restart:1,
311 * when ->rq_replay is set, request is kept by the client even
312 * after server commits corresponding transaction. This is
313 * used for operations that require sequence of multiple
314 * requests to be replayed. The only example currently is file
315 * open/close. When last request in such a sequence is
316 * committed, ->rq_replay is cleared on all requests in the
320 rq_no_resend:1, rq_waiting:1, rq_receiving_reply:1,
321 rq_no_delay:1, rq_net_err:1, rq_early:1, rq_must_unlink:1,
322 /* server-side flags */
323 rq_packed_final:1, /* packed final reply */
324 rq_hp:1, /* high priority RPC */
325 rq_at_linked:1, /* link into service's srv_at_array */
326 rq_reply_truncate:1, /* reply is truncated */
327 rq_fake:1, /* fake request - just for timeout only */
328 /* the request is queued to replay during recovery */
330 enum rq_phase rq_phase; /* one of RQ_PHASE_* */
331 enum rq_phase rq_next_phase; /* one of RQ_PHASE_* to be used next */
332 atomic_t rq_refcount; /* client-side refcount for SENT race,
333 server-side refcounf for multiple replies */
335 struct ptlrpc_thread *rq_svc_thread; /* initial thread servicing req */
337 int rq_request_portal; /* XXX FIXME bug 249 */
338 int rq_reply_portal; /* XXX FIXME bug 249 */
340 int rq_nob_received; /* client-side # reply bytes actually received */
343 struct lustre_msg *rq_reqmsg;
346 struct lustre_msg *rq_repbuf; /* client only, buf may be bigger than msg */
347 struct lustre_msg *rq_repmsg;
350 struct list_head rq_replay_list;
352 __u32 rq_req_swab_mask;
353 __u32 rq_rep_swab_mask;
355 int rq_import_generation;
356 enum lustre_imp_state rq_send_state;
358 int rq_early_count; /* how many early replies (for stats) */
360 /* client+server request */
361 lnet_handle_md_t rq_req_md_h;
362 struct ptlrpc_cb_id rq_req_cbid;
365 struct timeval rq_arrival_time; /* request arrival time */
366 struct ptlrpc_reply_state *rq_reply_state; /* separated reply state */
367 struct ptlrpc_request_buffer_desc *rq_rqbd; /* incoming request buffer*/
369 __u32 rq_uid; /* peer uid, used in MDS only */
372 /* client-only incoming reply */
373 lnet_handle_md_t rq_reply_md_h;
374 cfs_waitq_t rq_reply_waitq;
375 struct ptlrpc_cb_id rq_reply_cbid;
378 lnet_process_id_t rq_peer;
379 struct obd_export *rq_export;
380 struct obd_import *rq_import;
382 void (*rq_replay_cb)(struct ptlrpc_request *);
383 void (*rq_commit_cb)(struct ptlrpc_request *);
386 struct ptlrpc_bulk_desc *rq_bulk; /* client side bulk */
387 /* client outgoing req */
388 time_t rq_sent; /* when request sent, seconds,
389 * or time when request should
391 volatile time_t rq_deadline; /* when request must finish. volatile
392 so that servers' early reply updates to the deadline aren't
393 kept in per-cpu cache */
394 time_t rq_reply_deadline; /* when req reply unlink must finish. */
395 time_t rq_bulk_deadline; /* when req bulk unlink must finish. */
396 int rq_timeout; /* service time estimate (secs) */
399 struct list_head rq_set_chain;
400 struct ptlrpc_request_set *rq_set;
401 int (*rq_interpret_reply)(struct ptlrpc_request *req, void *data,
402 int rc); /* async interpret handler */
403 union ptlrpc_async_args rq_async_args; /* Async completion context */
404 struct ptlrpc_request_pool *rq_pool; /* Pool if request from
408 static inline int ptlrpc_req_interpret(struct ptlrpc_request *req, int rc)
410 if (req->rq_interpret_reply != NULL) {
411 int (*interpreter)(struct ptlrpc_request *, void *, int) =
412 req->rq_interpret_reply;
414 req->rq_status = interpreter(req, &req->rq_async_args, rc);
415 return req->rq_status;
420 static inline void lustre_set_req_swabbed(struct ptlrpc_request *req, int index)
422 LASSERT(index < sizeof(req->rq_req_swab_mask) * 8);
423 LASSERT((req->rq_req_swab_mask & (1 << index)) == 0);
424 req->rq_req_swab_mask |= 1 << index;
427 static inline void lustre_set_rep_swabbed(struct ptlrpc_request *req, int index)
429 LASSERT(index < sizeof(req->rq_rep_swab_mask) * 8);
430 LASSERT((req->rq_rep_swab_mask & (1 << index)) == 0);
431 req->rq_rep_swab_mask |= 1 << index;
434 static inline int lustre_req_swabbed(struct ptlrpc_request *req, int index)
436 LASSERT(index < sizeof(req->rq_req_swab_mask) * 8);
437 return req->rq_req_swab_mask & (1 << index);
440 static inline int lustre_rep_swabbed(struct ptlrpc_request *req, int index)
442 LASSERT(index < sizeof(req->rq_rep_swab_mask) * 8);
443 return req->rq_rep_swab_mask & (1 << index);
446 static inline int lustre_req_need_swab(struct ptlrpc_request *req)
448 return req->rq_req_swab_mask & (1 << MSG_PTLRPC_HEADER_OFF);
451 static inline int lustre_rep_need_swab(struct ptlrpc_request *req)
453 return req->rq_rep_swab_mask & (1 << MSG_PTLRPC_HEADER_OFF);
456 static inline const char *
457 ptlrpc_phase2str(enum rq_phase phase)
466 case RQ_PHASE_INTERPRET:
468 case RQ_PHASE_COMPLETE:
470 case RQ_PHASE_UNREGISTERING:
471 return "Unregistering";
477 static inline const char *
478 ptlrpc_rqphase2str(struct ptlrpc_request *req)
480 return ptlrpc_phase2str(req->rq_phase);
483 /* Spare the preprocessor, spoil the bugs. */
484 #define FLAG(field, str) (field ? str : "")
486 #define DEBUG_REQ_FLAGS(req) \
487 ptlrpc_rqphase2str(req), \
488 FLAG(req->rq_intr, "I"), FLAG(req->rq_replied, "R"), \
489 FLAG(req->rq_err, "E"), \
490 FLAG(req->rq_timedout, "X") /* eXpired */, FLAG(req->rq_resend, "S"), \
491 FLAG(req->rq_restart, "T"), FLAG(req->rq_replay, "P"), \
492 FLAG(req->rq_no_resend, "N"), \
493 FLAG(req->rq_waiting, "W"), FLAG(req->rq_hp, "H")
495 #define REQ_FLAGS_FMT "%s:%s%s%s%s%s%s%s%s%s%s"
497 void _debug_req(struct ptlrpc_request *req, __u32 mask,
498 struct libcfs_debug_msg_data *data, const char *fmt, ...)
499 __attribute__ ((format (printf, 4, 5)));
501 #define debug_req(cdls, level, req, file, func, line, fmt, a...) \
505 if (((level) & D_CANTMASK) != 0 || \
506 ((libcfs_debug & (level)) != 0 && \
507 (libcfs_subsystem_debug & DEBUG_SUBSYSTEM) != 0)) { \
508 static struct libcfs_debug_msg_data _req_dbg_data = \
509 DEBUG_MSG_DATA_INIT(cdls, DEBUG_SUBSYSTEM, file, func, line); \
510 _debug_req((req), (level), &_req_dbg_data, fmt, ##a); \
514 /* for most callers (level is a constant) this is resolved at compile time */
515 #define DEBUG_REQ(level, req, fmt, args...) \
517 if ((level) & (D_ERROR | D_WARNING)) { \
518 static cfs_debug_limit_state_t cdls; \
519 debug_req(&cdls, level, req, __FILE__, __func__, __LINE__, \
520 "@@@ "fmt" ", ## args); \
522 debug_req(NULL, level, req, __FILE__, __func__, __LINE__, \
523 "@@@ "fmt" ", ## args); \
526 struct ptlrpc_bulk_page {
527 struct list_head bp_link;
529 int bp_pageoffset; /* offset within a page */
530 struct page *bp_page;
533 #define BULK_GET_SOURCE 0
534 #define BULK_PUT_SINK 1
535 #define BULK_GET_SINK 2
536 #define BULK_PUT_SOURCE 3
538 struct ptlrpc_bulk_desc {
539 unsigned long bd_success:1; /* completed successfully */
540 unsigned long bd_network_rw:1; /* accessible to the network */
541 unsigned long bd_type:2; /* {put,get}{source,sink} */
542 unsigned long bd_registered:1; /* client side */
543 spinlock_t bd_lock; /* serialise with callback */
544 int bd_import_generation;
545 struct obd_export *bd_export;
546 struct obd_import *bd_import;
548 struct ptlrpc_request *bd_req; /* associated request */
549 cfs_waitq_t bd_waitq; /* server side only WQ */
550 int bd_iov_count; /* # entries in bd_iov */
551 int bd_max_iov; /* allocated size of bd_iov */
552 int bd_nob; /* # bytes covered */
553 int bd_nob_transferred; /* # bytes GOT/PUT */
557 struct ptlrpc_cb_id bd_cbid; /* network callback info */
558 lnet_handle_md_t bd_md_h; /* associated MD */
559 lnet_nid_t bd_sender; /* stash event::sender */
561 #if defined(__KERNEL__)
562 lnet_kiov_t bd_iov[0];
564 lnet_md_iovec_t bd_iov[0];
568 struct ptlrpc_thread {
570 struct list_head t_link; /* active threads in svc->srv_threads */
572 void *t_data; /* thread-private data (preallocated memory) */
575 unsigned int t_id; /* service thread index, from ptlrpc_start_threads */
576 struct lc_watchdog *t_watchdog; /* put watchdog in the structure per
578 struct ptlrpc_service *t_svc; /* the svc this thread belonged to
580 cfs_waitq_t t_ctl_waitq;
583 struct ptlrpc_request_buffer_desc {
584 struct list_head rqbd_list;
585 struct list_head rqbd_reqs;
586 struct ptlrpc_service *rqbd_service;
587 lnet_handle_md_t rqbd_md_h;
590 struct ptlrpc_cb_id rqbd_cbid;
591 struct ptlrpc_request rqbd_req;
594 typedef int (*svc_handler_t)(struct ptlrpc_request *req);
595 typedef void (*svcreq_printfn_t)(void *, struct ptlrpc_request *);
596 typedef int (*svc_hpreq_handler_t)(struct ptlrpc_request *);
598 #define PTLRPC_SVC_HP_RATIO 10
600 struct ptlrpc_service {
601 struct list_head srv_list; /* chain thru all services */
602 int srv_max_req_size; /* biggest request to receive */
603 int srv_max_reply_size; /* biggest reply to send */
604 int srv_buf_size; /* size of individual buffers */
605 int srv_nbuf_per_group; /* # buffers to allocate in 1 group */
606 int srv_nbufs; /* total # req buffer descs allocated */
607 int srv_threads_min; /* threads to start at SOW */
608 int srv_threads_max; /* thread upper limit */
609 int srv_threads_started; /* index of last started thread */
610 int srv_threads_running; /* # running threads */
611 int srv_n_difficult_replies; /* # 'difficult' replies */
612 int srv_n_active_reqs; /* # reqs being served */
613 int srv_n_hpreq; /* # HPreqs being served */
614 cfs_duration_t srv_rqbd_timeout; /* timeout before re-posting reqs, in tick */
615 int srv_watchdog_factor; /* soft watchdog timeout mutiplier */
616 unsigned srv_cpu_affinity:1; /* bind threads to CPUs */
617 unsigned srv_at_check:1; /* check early replies */
618 cfs_time_t srv_at_checktime; /* debug */
620 __u32 srv_req_portal;
621 __u32 srv_rep_portal;
624 struct adaptive_timeout srv_at_estimate;/* estimated rpc service time */
625 spinlock_t srv_at_lock;
626 struct ptlrpc_at_array srv_at_array; /* reqs waiting for replies */
627 cfs_timer_t srv_at_timer; /* early reply timer */
629 int srv_n_queued_reqs; /* # reqs in either of the queues below */
630 int srv_hpreq_count; /* # hp requests handled */
631 int srv_hpreq_ratio; /* # hp per lp reqs to handle */
632 struct list_head srv_req_in_queue; /* incoming reqs */
633 struct list_head srv_request_queue; /* reqs waiting for service */
634 struct list_head srv_request_hpq; /* high priority queue */
636 struct list_head srv_request_history; /* request history */
637 __u64 srv_request_seq; /* next request sequence # */
638 __u64 srv_request_max_cull_seq; /* highest seq culled from history */
639 svcreq_printfn_t srv_request_history_print_fn; /* service-specific print fn */
641 struct list_head srv_idle_rqbds; /* request buffers to be reposted */
642 struct list_head srv_active_rqbds; /* req buffers receiving */
643 struct list_head srv_history_rqbds; /* request buffer history */
644 int srv_nrqbd_receiving; /* # posted request buffers */
645 int srv_n_history_rqbds; /* # request buffers in history */
646 int srv_max_history_rqbds;/* max # request buffers in history */
648 atomic_t srv_outstanding_replies;
649 struct list_head srv_active_replies; /* all the active replies */
650 struct list_head srv_reply_queue; /* replies waiting for service */
652 cfs_waitq_t srv_waitq; /* all threads sleep on this. This
653 * wait-queue is signalled when new
654 * incoming request arrives and when
655 * difficult reply has to be handled. */
657 struct list_head srv_threads; /* service thread list */
658 svc_handler_t srv_handler;
659 svc_hpreq_handler_t srv_hpreq_handler; /* hp request handler */
661 char *srv_name; /* only statically allocated strings here; we don't clean them */
662 char *srv_thread_name; /* only statically allocated strings here; we don't clean them */
666 cfs_proc_dir_entry_t *srv_procroot;
667 struct lprocfs_stats *srv_stats;
669 /* List of free reply_states */
670 struct list_head srv_free_rs_list;
671 /* waitq to run, when adding stuff to srv_free_rs_list */
672 cfs_waitq_t srv_free_rs_waitq;
675 * if non-NULL called during thread creation (ptlrpc_start_thread())
676 * to initialize service specific per-thread state.
678 int (*srv_init)(struct ptlrpc_thread *thread);
680 * if non-NULL called during thread shutdown (ptlrpc_main()) to
681 * destruct state created by ->srv_init().
683 void (*srv_done)(struct ptlrpc_thread *thread);
685 //struct ptlrpc_srv_ni srv_interfaces[0];
690 * Ptlrpc thread control flags (LIOD_START, LIOD_STOP, LIOD_FORCE)
692 unsigned long pc_flags;
694 * Thread lock protecting structure fields.
700 struct completion pc_starting;
704 struct completion pc_finishing;
706 * Thread requests set.
708 struct ptlrpc_request_set *pc_set;
710 * Thread name used in cfs_daemonize()
715 * Async rpcs flag to make sure that ptlrpcd_check() is called only
720 * Currently not used.
724 * User-space async rpcs callback.
726 void *pc_wait_callback;
728 * User-space check idle rpcs callback.
730 void *pc_idle_callback;
734 /* Bits for pc_flags */
735 enum ptlrpcd_ctl_flags {
737 * Ptlrpc thread start flag.
741 * Ptlrpc thread stop flag.
745 * Ptlrpc thread force flag (only stop force so far).
746 * This will cause aborting any inflight rpcs handled
747 * by thread if LIOD_STOP is specified.
752 /* ptlrpc/events.c */
753 extern lnet_handle_eq_t ptlrpc_eq_h;
754 extern int ptlrpc_uuid_to_peer(struct obd_uuid *uuid,
755 lnet_process_id_t *peer, lnet_nid_t *self);
756 extern void request_out_callback (lnet_event_t *ev);
757 extern void reply_in_callback(lnet_event_t *ev);
758 extern void client_bulk_callback (lnet_event_t *ev);
759 extern void request_in_callback(lnet_event_t *ev);
760 extern void reply_out_callback(lnet_event_t *ev);
761 extern void server_bulk_callback (lnet_event_t *ev);
763 /* ptlrpc/connection.c */
764 struct ptlrpc_connection *ptlrpc_connection_get(lnet_process_id_t peer,
766 struct obd_uuid *uuid);
767 int ptlrpc_connection_put(struct ptlrpc_connection *c);
768 struct ptlrpc_connection *ptlrpc_connection_addref(struct ptlrpc_connection *);
769 int ptlrpc_connection_init(void);
770 void ptlrpc_connection_fini(void);
771 extern lnet_pid_t ptl_get_pid(void);
773 /* ptlrpc/niobuf.c */
774 int ptlrpc_start_bulk_transfer(struct ptlrpc_bulk_desc *desc);
775 void ptlrpc_abort_bulk(struct ptlrpc_bulk_desc *desc);
776 int ptlrpc_register_bulk(struct ptlrpc_request *req);
777 int ptlrpc_unregister_bulk(struct ptlrpc_request *req, int async);
779 static inline int ptlrpc_server_bulk_active(struct ptlrpc_bulk_desc *desc)
783 LASSERT(desc != NULL);
785 spin_lock(&desc->bd_lock);
786 rc = desc->bd_network_rw;
787 spin_unlock(&desc->bd_lock);
791 static inline int ptlrpc_client_bulk_active(struct ptlrpc_request *req)
793 struct ptlrpc_bulk_desc *desc = req->rq_bulk;
796 LASSERT(req != NULL);
798 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_BULK_UNLINK) &&
799 req->rq_bulk_deadline > cfs_time_current_sec())
805 spin_lock(&desc->bd_lock);
806 rc = desc->bd_network_rw;
807 spin_unlock(&desc->bd_lock);
811 #define PTLRPC_REPLY_MAYBE_DIFFICULT 0x01
812 #define PTLRPC_REPLY_EARLY 0x02
813 int ptlrpc_send_reply(struct ptlrpc_request *req, int flags);
814 int ptlrpc_reply(struct ptlrpc_request *req);
815 int ptlrpc_send_error(struct ptlrpc_request *req, int difficult);
816 int ptlrpc_error(struct ptlrpc_request *req);
817 void ptlrpc_resend_req(struct ptlrpc_request *request);
818 int ptlrpc_at_get_net_latency(struct ptlrpc_request *req);
819 int ptl_send_rpc(struct ptlrpc_request *request, int noreply);
820 int ptlrpc_register_rqbd (struct ptlrpc_request_buffer_desc *rqbd);
822 /* ptlrpc/client.c */
823 void ptlrpc_init_client(int req_portal, int rep_portal, char *name,
824 struct ptlrpc_client *);
825 void ptlrpc_cleanup_client(struct obd_import *imp);
826 struct ptlrpc_connection *ptlrpc_uuid_to_connection(struct obd_uuid *uuid);
828 int ptlrpc_queue_wait(struct ptlrpc_request *req);
829 int ptlrpc_replay_req(struct ptlrpc_request *req);
830 int ptlrpc_unregister_reply(struct ptlrpc_request *req, int async);
831 void ptlrpc_restart_req(struct ptlrpc_request *req);
832 void ptlrpc_abort_inflight(struct obd_import *imp);
833 void ptlrpc_cleanup_imp(struct obd_import *imp);
834 void ptlrpc_abort_set(struct ptlrpc_request_set *set);
836 struct ptlrpc_request_set *ptlrpc_prep_set(void);
837 int ptlrpc_set_add_cb(struct ptlrpc_request_set *set,
838 set_interpreter_func fn, void *data);
839 int ptlrpc_set_next_timeout(struct ptlrpc_request_set *);
840 int ptlrpc_check_set(struct ptlrpc_request_set *set);
841 int ptlrpc_set_wait(struct ptlrpc_request_set *);
842 int ptlrpc_expired_set(void *data);
843 void ptlrpc_interrupted_set(void *data);
844 void ptlrpc_mark_interrupted(struct ptlrpc_request *req);
845 void ptlrpc_set_destroy(struct ptlrpc_request_set *);
846 void ptlrpc_set_add_req(struct ptlrpc_request_set *, struct ptlrpc_request *);
847 int ptlrpc_set_add_new_req(struct ptlrpcd_ctl *pc,
848 struct ptlrpc_request *req);
850 void ptlrpc_free_rq_pool(struct ptlrpc_request_pool *pool);
851 void ptlrpc_add_rqs_to_pool(struct ptlrpc_request_pool *pool, int num_rq);
853 struct ptlrpc_request_pool *
854 ptlrpc_init_rq_pool(int, int,
855 void (*populate_pool)(struct ptlrpc_request_pool *, int));
857 void ptlrpc_at_set_req_timeout(struct ptlrpc_request *req);
858 struct ptlrpc_request *ptlrpc_prep_fakereq(struct obd_import *imp,
859 unsigned int timeout,
860 int (*interpreter)(struct ptlrpc_request *,
862 void ptlrpc_fakereq_finished(struct ptlrpc_request *req);
864 struct ptlrpc_request *ptlrpc_prep_req(struct obd_import *imp, __u32 version,
865 int opcode, int count, __u32 *lengths,
867 struct ptlrpc_request *ptlrpc_prep_req_pool(struct obd_import *imp,
868 __u32 version, int opcode,
869 int count, __u32 *lengths, char **bufs,
870 struct ptlrpc_request_pool *pool);
871 void ptlrpc_req_finished(struct ptlrpc_request *request);
872 void ptlrpc_req_finished_with_imp_lock(struct ptlrpc_request *request);
873 struct ptlrpc_request *ptlrpc_request_addref(struct ptlrpc_request *req);
874 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_imp (struct ptlrpc_request *req,
875 int npages, int type, int portal);
876 struct ptlrpc_bulk_desc *ptlrpc_prep_bulk_exp(struct ptlrpc_request *req,
877 int npages, int type, int portal);
878 void ptlrpc_free_bulk(struct ptlrpc_bulk_desc *bulk);
879 void ptlrpc_prep_bulk_page(struct ptlrpc_bulk_desc *desc,
880 cfs_page_t *page, int pageoffset, int len);
881 void ptlrpc_retain_replayable_request(struct ptlrpc_request *req,
882 struct obd_import *imp);
883 __u64 ptlrpc_next_xid(void);
884 __u64 ptlrpc_sample_next_xid(void);
885 __u64 ptlrpc_req_xid(struct ptlrpc_request *request);
887 /* ptlrpc/service.c */
888 void ptlrpc_save_lock (struct ptlrpc_request *req,
889 struct lustre_handle *lock, int mode);
890 void ptlrpc_commit_replies (struct obd_export *exp);
891 void ptlrpc_schedule_difficult_reply (struct ptlrpc_reply_state *rs);
892 struct ptlrpc_service *ptlrpc_init_svc(int nbufs, int bufsize, int max_req_size,
894 int req_portal, int rep_portal,
896 svc_handler_t, char *name,
897 cfs_proc_dir_entry_t *proc_entry,
899 int min_threads, int max_threads,
900 char *threadname, svc_hpreq_handler_t);
901 void ptlrpc_stop_all_threads(struct ptlrpc_service *svc);
903 int ptlrpc_start_threads(struct obd_device *dev, struct ptlrpc_service *svc);
904 int ptlrpc_start_thread(struct obd_device *dev, struct ptlrpc_service *svc);
905 int ptlrpc_unregister_service(struct ptlrpc_service *service);
906 int liblustre_check_services (void *arg);
907 void ptlrpc_daemonize(char *name);
908 int ptlrpc_service_health_check(struct ptlrpc_service *);
909 void ptlrpc_hpreq_reorder(struct ptlrpc_request *req);
910 void ptlrpc_server_drop_request(struct ptlrpc_request *req);
913 struct ptlrpc_svc_data {
915 struct ptlrpc_service *svc;
916 struct ptlrpc_thread *thread;
917 struct obd_device *dev;
920 /* ptlrpc/import.c */
921 int ptlrpc_connect_import(struct obd_import *imp, char * new_uuid);
922 int ptlrpc_init_import(struct obd_import *imp);
923 int ptlrpc_disconnect_import(struct obd_import *imp, int noclose);
924 int ptlrpc_import_recovery_state_machine(struct obd_import *imp);
925 void ptlrpc_import_setasync(struct obd_import *imp, int count);
926 int ptlrpc_reconnect_import(struct obd_import *imp);
928 /* ptlrpc/pack_generic.c */
929 int lustre_msg_swabbed(struct lustre_msg *msg);
930 int lustre_msg_check_version(struct lustre_msg *msg, __u32 version);
931 int lustre_pack_request(struct ptlrpc_request *, __u32 magic, int count,
932 __u32 *lens, char **bufs);
933 int lustre_pack_reply(struct ptlrpc_request *, int count, __u32 *lens,
935 #define LPRFL_EARLY_REPLY 1
936 int lustre_pack_reply_flags(struct ptlrpc_request *, int count, __u32 *lens,
937 char **bufs, int flags);
938 void lustre_shrink_reply(struct ptlrpc_request *req, int segment,
939 unsigned int newlen, int move_data);
940 void lustre_free_reply_state(struct ptlrpc_reply_state *rs);
941 int lustre_msg_size(__u32 magic, int count, __u32 *lengths);
942 int lustre_packed_msg_size(struct lustre_msg *msg);
943 int lustre_msg_early_size(struct ptlrpc_request *req);
944 int lustre_unpack_msg(struct lustre_msg *m, int len);
945 void *lustre_msg_buf(struct lustre_msg *m, int n, int minlen);
946 int lustre_msg_buflen(struct lustre_msg *m, int n);
947 void lustre_msg_set_buflen(struct lustre_msg *m, int n, int len);
948 int lustre_msg_bufcount(struct lustre_msg *m);
949 char *lustre_msg_string (struct lustre_msg *m, int n, int max_len);
950 void *lustre_swab_reqbuf(struct ptlrpc_request *req, int n, int minlen,
952 void *lustre_swab_repbuf(struct ptlrpc_request *req, int n, int minlen,
954 __u32 lustre_msghdr_get_flags(struct lustre_msg *msg);
955 void lustre_msghdr_set_flags(struct lustre_msg *msg, __u32 flags);
956 __u32 lustre_msg_get_flags(struct lustre_msg *msg);
957 void lustre_msg_add_flags(struct lustre_msg *msg, int flags);
958 void lustre_msg_set_flags(struct lustre_msg *msg, int flags);
959 void lustre_msg_clear_flags(struct lustre_msg *msg, int flags);
960 __u32 lustre_msg_get_op_flags(struct lustre_msg *msg);
961 void lustre_msg_add_op_flags(struct lustre_msg *msg, int flags);
962 void lustre_msg_set_op_flags(struct lustre_msg *msg, int flags);
963 struct lustre_handle *lustre_msg_get_handle(struct lustre_msg *msg);
964 __u32 lustre_msg_get_type(struct lustre_msg *msg);
965 __u32 lustre_msg_get_version(struct lustre_msg *msg);
966 void lustre_msg_add_version(struct lustre_msg *msg, int version);
967 __u32 lustre_msg_get_opc(struct lustre_msg *msg);
968 __u64 lustre_msg_get_last_xid(struct lustre_msg *msg);
969 __u64 lustre_msg_get_last_committed(struct lustre_msg *msg);
970 __u64 *lustre_msg_get_versions(struct lustre_msg *msg);
971 __u64 lustre_msg_get_transno(struct lustre_msg *msg);
972 __u64 lustre_msg_get_slv(struct lustre_msg *msg);
973 __u32 lustre_msg_get_limit(struct lustre_msg *msg);
974 void lustre_msg_set_slv(struct lustre_msg *msg, __u64 slv);
975 void lustre_msg_set_limit(struct lustre_msg *msg, __u64 limit);
976 int lustre_msg_get_status(struct lustre_msg *msg);
977 __u32 lustre_msg_get_conn_cnt(struct lustre_msg *msg);
978 int lustre_msg_is_v1(struct lustre_msg *msg);
979 __u32 lustre_msg_get_magic(struct lustre_msg *msg);
980 __u32 lustre_msg_get_timeout(struct lustre_msg *msg);
981 __u32 lustre_msg_get_service_time(struct lustre_msg *msg);
982 __u32 lustre_msg_get_cksum(struct lustre_msg *msg);
983 __u32 lustre_msg_calc_cksum(struct lustre_msg *msg);
984 void lustre_msg_set_handle(struct lustre_msg *msg,struct lustre_handle *handle);
985 void lustre_msg_set_type(struct lustre_msg *msg, __u32 type);
986 void lustre_msg_set_opc(struct lustre_msg *msg, __u32 opc);
987 void lustre_msg_set_last_xid(struct lustre_msg *msg, __u64 last_xid);
988 void lustre_msg_set_last_committed(struct lustre_msg *msg,__u64 last_committed);
989 void lustre_msg_set_versions(struct lustre_msg *msg, __u64 *versions);
990 void lustre_msg_set_transno(struct lustre_msg *msg, __u64 transno);
991 void lustre_msg_set_status(struct lustre_msg *msg, __u32 status);
992 void lustre_msg_set_conn_cnt(struct lustre_msg *msg, __u32 conn_cnt);
993 void lustre_msg_set_timeout(struct lustre_msg *msg, __u32 timeout);
994 void lustre_msg_set_service_time(struct lustre_msg *msg, __u32 service_time);
995 void lustre_msg_set_cksum(struct lustre_msg *msg, __u32 cksum);
998 ptlrpc_rqphase_move(struct ptlrpc_request *req, enum rq_phase new_phase)
1000 if (req->rq_phase == new_phase)
1003 if (new_phase == RQ_PHASE_UNREGISTERING) {
1004 req->rq_next_phase = req->rq_phase;
1006 atomic_inc(&req->rq_import->imp_unregistering);
1009 if (req->rq_phase == RQ_PHASE_UNREGISTERING) {
1011 atomic_dec(&req->rq_import->imp_unregistering);
1014 DEBUG_REQ(D_INFO, req, "move req \"%s\" -> \"%s\"",
1015 ptlrpc_rqphase2str(req), ptlrpc_phase2str(new_phase));
1017 req->rq_phase = new_phase;
1021 ptlrpc_client_early(struct ptlrpc_request *req)
1023 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
1024 req->rq_reply_deadline > cfs_time_current_sec())
1026 return req->rq_early;
1030 ptlrpc_client_replied(struct ptlrpc_request *req)
1032 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
1033 req->rq_reply_deadline > cfs_time_current_sec())
1035 return req->rq_replied;
1039 ptlrpc_client_recv(struct ptlrpc_request *req)
1041 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
1042 req->rq_reply_deadline > cfs_time_current_sec())
1044 return req->rq_receiving_reply;
1048 ptlrpc_client_recv_or_unlink(struct ptlrpc_request *req)
1052 spin_lock(&req->rq_lock);
1053 if (OBD_FAIL_CHECK(OBD_FAIL_PTLRPC_LONG_REPL_UNLINK) &&
1054 req->rq_reply_deadline > cfs_time_current_sec()) {
1055 spin_unlock(&req->rq_lock);
1058 rc = req->rq_receiving_reply || req->rq_must_unlink;
1059 spin_unlock(&req->rq_lock);
1064 ptlrpc_client_wake_req(struct ptlrpc_request *req)
1066 if (req->rq_set == NULL)
1067 cfs_waitq_signal(&req->rq_reply_waitq);
1069 cfs_waitq_signal(&req->rq_set->set_waitq);
1073 ptlrpc_rs_addref(struct ptlrpc_reply_state *rs)
1075 LASSERT(atomic_read(&rs->rs_refcount) > 0);
1076 atomic_inc(&rs->rs_refcount);
1080 ptlrpc_rs_decref(struct ptlrpc_reply_state *rs)
1082 LASSERT(atomic_read(&rs->rs_refcount) > 0);
1083 if (atomic_dec_and_test(&rs->rs_refcount))
1084 lustre_free_reply_state(rs);
1087 /* Should only be called once per req */
1088 static inline void ptlrpc_req_drop_rs(struct ptlrpc_request *req)
1090 if (req->rq_reply_state == NULL)
1091 return; /* shouldn't occur */
1092 ptlrpc_rs_decref(req->rq_reply_state);
1093 req->rq_reply_state = NULL;
1094 req->rq_repmsg = NULL;
1097 static inline __u32 lustre_request_magic(struct ptlrpc_request *req)
1099 return lustre_msg_get_magic(req->rq_reqmsg);
1102 static inline int ptlrpc_req_get_repsize(struct ptlrpc_request *req)
1104 switch (req->rq_reqmsg->lm_magic) {
1105 case LUSTRE_MSG_MAGIC_V1:
1106 CERROR("function not supported for lustre_msg V1!\n");
1108 case LUSTRE_MSG_MAGIC_V2:
1109 return req->rq_reqmsg->lm_repsize;
1111 LASSERTF(0, "incorrect message magic: %08x\n",
1112 req->rq_reqmsg->lm_magic);
1118 ptlrpc_req_set_repsize(struct ptlrpc_request *req, int count, __u32 *lens)
1120 int size = lustre_msg_size(req->rq_reqmsg->lm_magic, count, lens);
1122 req->rq_replen = size + lustre_msg_early_size(req);
1123 if (req->rq_reqmsg->lm_magic == LUSTRE_MSG_MAGIC_V2)
1124 req->rq_reqmsg->lm_repsize = size;
1127 /* ldlm/ldlm_lib.c */
1128 int client_obd_setup(struct obd_device *obddev, obd_count len, void *buf);
1129 int client_obd_cleanup(struct obd_device * obddev);
1130 int client_connect_import(struct lustre_handle *conn, struct obd_device *obd,
1131 struct obd_uuid *cluuid, struct obd_connect_data *,
1133 int client_disconnect_export(struct obd_export *exp);
1134 int client_import_add_conn(struct obd_import *imp, struct obd_uuid *uuid,
1136 int client_import_del_conn(struct obd_import *imp, struct obd_uuid *uuid);
1137 int import_set_conn_priority(struct obd_import *imp, struct obd_uuid *uuid);
1138 int server_disconnect_export(struct obd_export *exp);
1140 /* ptlrpc/pinger.c */
1141 enum timeout_event {
1144 struct timeout_item;
1145 typedef int (*timeout_cb_t)(struct timeout_item *, void *);
1146 int ptlrpc_pinger_add_import(struct obd_import *imp);
1147 int ptlrpc_pinger_del_import(struct obd_import *imp);
1148 int ptlrpc_add_timeout_client(int time, enum timeout_event event,
1149 timeout_cb_t cb, void *data,
1150 struct list_head *obd_list);
1151 int ptlrpc_del_timeout_client(struct list_head *obd_list,
1152 enum timeout_event event);
1153 struct ptlrpc_request * ptlrpc_prep_ping(struct obd_import *imp);
1154 int ptlrpc_obd_ping(struct obd_device *obd);
1156 void ping_evictor_start(void);
1157 void ping_evictor_stop(void);
1158 int ping_evictor_wake(struct obd_export *exp);
1160 #define ping_evictor_start() do {} while (0)
1161 #define ping_evictor_stop() do {} while (0)
1162 static inline int ping_evictor_wake(struct obd_export *exp)
1168 /* ptlrpc/ptlrpcd.c */
1169 int ptlrpcd_start(char *name, struct ptlrpcd_ctl *pc);
1170 void ptlrpcd_stop(struct ptlrpcd_ctl *pc, int force);
1171 void ptlrpcd_wake(struct ptlrpc_request *req);
1172 int ptlrpcd_add_req(struct ptlrpc_request *req);
1173 void ptlrpcd_add_rqset(struct ptlrpc_request_set *set);
1174 int ptlrpcd_addref(void);
1175 void ptlrpcd_decref(void);
1177 /* ptlrpc/lproc_ptlrpc.c */
1178 const char* ll_opcode2str(__u32 opcode);
1180 void ptlrpc_lprocfs_register_obd(struct obd_device *obd);
1181 void ptlrpc_lprocfs_unregister_obd(struct obd_device *obd);
1182 void ptlrpc_lprocfs_brw(struct ptlrpc_request *req, int bytes);
1184 static inline void ptlrpc_lprocfs_register_obd(struct obd_device *obd) {}
1185 static inline void ptlrpc_lprocfs_unregister_obd(struct obd_device *obd) {}
1186 static inline void ptlrpc_lprocfs_brw(struct ptlrpc_request *req, int bytes) {}
1189 /* ptlrpc/llog_server.c */
1190 int llog_origin_handle_create(struct ptlrpc_request *req);
1191 int llog_origin_handle_destroy(struct ptlrpc_request *req);
1192 int llog_origin_handle_prev_block(struct ptlrpc_request *req);
1193 int llog_origin_handle_next_block(struct ptlrpc_request *req);
1194 int llog_origin_handle_read_header(struct ptlrpc_request *req);
1195 int llog_origin_handle_close(struct ptlrpc_request *req);
1196 int llog_origin_handle_cancel(struct ptlrpc_request *req);
1197 int llog_catinfo(struct ptlrpc_request *req);
1199 /* ptlrpc/llog_client.c */
1200 extern struct llog_operations llog_client_ops;