1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2003 Cluster File Systems, Inc.
5 * Author: Andreas Dilger <adilger@clusterfs.com>
7 * This file is part of the Lustre file system, http://www.lustre.org
8 * Lustre is a trademark of Cluster File Systems, Inc.
10 * You may have signed or agreed to another license before downloading
11 * this software. If so, you are bound by the terms and conditions
12 * of that agreement, and the following does not apply to you. See the
13 * LICENSE file included with this distribution for more information.
15 * If you did not agree to a different license, then this copy of Lustre
16 * is open source software; you can redistribute it and/or modify it
17 * under the terms of version 2 of the GNU General Public License as
18 * published by the Free Software Foundation.
20 * In either case, Lustre is distributed in the hope that it will be
21 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
22 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * license text for more details.
25 * OST<->MDS recovery logging thread.
27 * Invariants in implementation:
28 * - we do not share logs among different OST<->MDS connections, so that
29 * if an OST or MDS fails it need only look at log(s) relevant to itself
32 #define DEBUG_SUBSYSTEM S_LOG
35 # define EXPORT_SYMTAB
39 # include <libcfs/libcfs.h>
41 # include <libcfs/list.h>
42 # include <liblustre.h>
45 #include <libcfs/kp30.h>
46 #include <obd_class.h>
47 #include <lustre_commit_confd.h>
48 #include <obd_support.h>
49 #include <obd_class.h>
50 #include <lustre_net.h>
51 #include <lnet/types.h>
52 #include <libcfs/list.h>
53 #include <lustre_log.h>
54 #include "ptlrpc_internal.h"
58 static struct llog_commit_master lustre_lcm;
59 static struct llog_commit_master *lcm = &lustre_lcm;
61 /* Allocate new commit structs in case we do not have enough.
62 * Make the llcd size small enough that it fits into a single page when we
63 * are sending/receiving it. */
64 static int llcd_alloc(void)
66 struct llog_canceld_ctxt *llcd;
69 /* payload of lustre_msg V2 is bigger */
70 llcd_size = 4096 - lustre_msg_size(LUSTRE_MSG_MAGIC_V2, 1, NULL);
72 llcd_size + offsetof(struct llog_canceld_ctxt, llcd_cookies));
76 llcd->llcd_size = llcd_size;
79 spin_lock(&lcm->lcm_llcd_lock);
80 list_add(&llcd->llcd_list, &lcm->lcm_llcd_free);
81 atomic_inc(&lcm->lcm_llcd_numfree);
82 spin_unlock(&lcm->lcm_llcd_lock);
87 /* Get a free cookie struct from the list */
88 struct llog_canceld_ctxt *llcd_grab(void)
90 struct llog_canceld_ctxt *llcd;
93 spin_lock(&lcm->lcm_llcd_lock);
94 if (list_empty(&lcm->lcm_llcd_free)) {
95 spin_unlock(&lcm->lcm_llcd_lock);
96 if (llcd_alloc() < 0) {
97 CERROR("unable to allocate log commit data!\n");
100 /* check new llcd wasn't grabbed while lock dropped, b=7407 */
104 llcd = list_entry(lcm->lcm_llcd_free.next, typeof(*llcd), llcd_list);
105 list_del(&llcd->llcd_list);
106 atomic_dec(&lcm->lcm_llcd_numfree);
107 spin_unlock(&lcm->lcm_llcd_lock);
109 llcd->llcd_cookiebytes = 0;
113 EXPORT_SYMBOL(llcd_grab);
115 static void llcd_put(struct llog_canceld_ctxt *llcd)
117 if (atomic_read(&lcm->lcm_llcd_numfree) >= lcm->lcm_llcd_maxfree) {
118 int llcd_size = llcd->llcd_size +
119 offsetof(struct llog_canceld_ctxt, llcd_cookies);
120 OBD_FREE(llcd, llcd_size);
122 spin_lock(&lcm->lcm_llcd_lock);
123 list_add(&llcd->llcd_list, &lcm->lcm_llcd_free);
124 atomic_inc(&lcm->lcm_llcd_numfree);
125 spin_unlock(&lcm->lcm_llcd_lock);
129 /* Send some cookies to the appropriate target */
130 void llcd_send(struct llog_canceld_ctxt *llcd)
132 spin_lock(&llcd->llcd_lcm->lcm_llcd_lock);
133 list_add_tail(&llcd->llcd_list, &llcd->llcd_lcm->lcm_llcd_pending);
134 spin_unlock(&llcd->llcd_lcm->lcm_llcd_lock);
136 cfs_waitq_signal_nr(&llcd->llcd_lcm->lcm_waitq, 1);
138 EXPORT_SYMBOL(llcd_send);
140 /* deleted objects have a commit callback that cancels the MDS
141 * log record for the deletion. The commit callback calls this
144 int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
145 struct lov_stripe_md *lsm, int count,
146 struct llog_cookie *cookies, int flags)
148 struct llog_canceld_ctxt *llcd;
154 mutex_down(&ctxt->loc_sem);
155 if (ctxt->loc_imp == NULL) {
156 CWARN("no import for ctxt %p\n", ctxt);
160 llcd = ctxt->loc_llcd;
162 if (count > 0 && cookies != NULL) {
166 CERROR("couldn't get an llcd - dropped "LPX64
168 cookies->lgc_lgl.lgl_oid,
169 cookies->lgc_lgl.lgl_ogen,
171 GOTO(out, rc = -ENOMEM);
173 llcd->llcd_ctxt = ctxt;
174 ctxt->loc_llcd = llcd;
177 memcpy((char *)llcd->llcd_cookies + llcd->llcd_cookiebytes,
178 cookies, sizeof(*cookies));
179 llcd->llcd_cookiebytes += sizeof(*cookies);
181 if (llcd == NULL || !(flags & OBD_LLOG_FL_SENDNOW))
185 if ((llcd->llcd_size - llcd->llcd_cookiebytes) < sizeof(*cookies) ||
186 (flags & OBD_LLOG_FL_SENDNOW)) {
187 CDEBUG(D_HA, "send llcd %p:%p\n", llcd, llcd->llcd_ctxt);
188 ctxt->loc_llcd = NULL;
192 mutex_up(&ctxt->loc_sem);
195 EXPORT_SYMBOL(llog_obd_repl_cancel);
197 int llog_obd_repl_sync(struct llog_ctxt *ctxt, struct obd_export *exp)
202 if (exp && (ctxt->loc_imp == exp->exp_imp_reverse)) {
203 CDEBUG(D_HA, "reverse import disconnected, put llcd %p:%p\n",
204 ctxt->loc_llcd, ctxt);
205 mutex_down(&ctxt->loc_sem);
206 if (ctxt->loc_llcd != NULL) {
207 llcd_put(ctxt->loc_llcd);
208 ctxt->loc_llcd = NULL;
210 ctxt->loc_imp = NULL;
211 mutex_up(&ctxt->loc_sem);
213 rc = llog_cancel(ctxt, NULL, 0, NULL, OBD_LLOG_FL_SENDNOW);
218 EXPORT_SYMBOL(llog_obd_repl_sync);
220 static int log_commit_thread(void *arg)
222 struct llog_commit_master *lcm = arg;
223 struct llog_commit_daemon *lcd;
224 struct llog_canceld_ctxt *llcd, *n;
227 OBD_ALLOC(lcd, sizeof(*lcd));
231 spin_lock(&lcm->lcm_thread_lock);
232 THREAD_NAME(cfs_curproc_comm(), CFS_CURPROC_COMM_MAX - 1,
233 "ll_log_comt_%02d", atomic_read(&lcm->lcm_thread_total));
234 atomic_inc(&lcm->lcm_thread_total);
235 spin_unlock(&lcm->lcm_thread_lock);
237 ptlrpc_daemonize(cfs_curproc_comm()); /* thread never needs to do IO */
239 CFS_INIT_LIST_HEAD(&lcd->lcd_lcm_list);
240 CFS_INIT_LIST_HEAD(&lcd->lcd_llcd_list);
243 CDEBUG(D_HA, "%s started\n", cfs_curproc_comm());
245 struct ptlrpc_request *request;
246 struct obd_import *import = NULL;
247 struct list_head *sending_list;
250 /* If we do not have enough pages available, allocate some */
251 while (atomic_read(&lcm->lcm_llcd_numfree) <
252 lcm->lcm_llcd_minfree) {
253 if (llcd_alloc() < 0)
257 spin_lock(&lcm->lcm_thread_lock);
258 atomic_inc(&lcm->lcm_thread_numidle);
259 list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_idle);
260 spin_unlock(&lcm->lcm_thread_lock);
262 wait_event_interruptible(lcm->lcm_waitq,
263 !list_empty(&lcm->lcm_llcd_pending) ||
264 lcm->lcm_flags & LLOG_LCM_FL_EXIT);
266 /* If we are the last available thread, start a new one in case
267 * we get blocked on an RPC (nobody else will start a new one)*/
268 spin_lock(&lcm->lcm_thread_lock);
269 atomic_dec(&lcm->lcm_thread_numidle);
270 list_move(&lcd->lcd_lcm_list, &lcm->lcm_thread_busy);
271 spin_unlock(&lcm->lcm_thread_lock);
273 sending_list = &lcm->lcm_llcd_pending;
276 if (lcm->lcm_flags & LLOG_LCM_FL_EXIT) {
277 lcm->lcm_llcd_maxfree = 0;
278 lcm->lcm_llcd_minfree = 0;
279 lcm->lcm_thread_max = 0;
281 if (list_empty(&lcm->lcm_llcd_pending) ||
282 lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE)
286 if (atomic_read(&lcm->lcm_thread_numidle) <= 1 &&
287 atomic_read(&lcm->lcm_thread_total) < lcm->lcm_thread_max) {
288 rc = llog_start_commit_thread();
290 CERROR("error starting thread: rc %d\n", rc);
293 /* Move all of the pending cancels from the same OST off of
294 * the list, so we don't get multiple threads blocked and/or
295 * doing upcalls on the same OST in case of failure. */
296 spin_lock(&lcm->lcm_llcd_lock);
297 if (!list_empty(sending_list)) {
298 list_move_tail(sending_list->next,
299 &lcd->lcd_llcd_list);
300 llcd = list_entry(lcd->lcd_llcd_list.next,
301 typeof(*llcd), llcd_list);
302 LASSERT(llcd->llcd_lcm == lcm);
303 import = llcd->llcd_ctxt->loc_imp;
305 list_for_each_entry_safe(llcd, n, sending_list, llcd_list) {
306 LASSERT(llcd->llcd_lcm == lcm);
307 if (import == llcd->llcd_ctxt->loc_imp)
308 list_move_tail(&llcd->llcd_list,
309 &lcd->lcd_llcd_list);
311 if (sending_list != &lcm->lcm_llcd_resend) {
312 list_for_each_entry_safe(llcd, n, &lcm->lcm_llcd_resend,
314 LASSERT(llcd->llcd_lcm == lcm);
315 if (import == llcd->llcd_ctxt->loc_imp)
316 list_move_tail(&llcd->llcd_list,
317 &lcd->lcd_llcd_list);
320 spin_unlock(&lcm->lcm_llcd_lock);
322 /* We are the only one manipulating our local list - no lock */
323 list_for_each_entry_safe(llcd,n, &lcd->lcd_llcd_list,llcd_list){
324 int size[2] = { sizeof(struct ptlrpc_body),
325 llcd->llcd_cookiebytes };
326 char *bufs[2] = { NULL, (char *)llcd->llcd_cookies };
328 list_del(&llcd->llcd_list);
329 if (llcd->llcd_cookiebytes == 0) {
330 CDEBUG(D_HA, "put empty llcd %p:%p\n",
331 llcd, llcd->llcd_ctxt);
336 mutex_down(&llcd->llcd_ctxt->loc_sem);
337 if (llcd->llcd_ctxt->loc_imp == NULL) {
338 mutex_up(&llcd->llcd_ctxt->loc_sem);
339 CWARN("import will be destroyed, put "
340 "llcd %p:%p\n", llcd, llcd->llcd_ctxt);
344 mutex_up(&llcd->llcd_ctxt->loc_sem);
346 if (!import || (import == LP_POISON) ||
347 (import->imp_client == LP_POISON)) {
348 CERROR("No import %p (llcd=%p, ctxt=%p)\n",
349 import, llcd, llcd->llcd_ctxt);
354 request = ptlrpc_prep_req(import, LUSTRE_LOG_VERSION,
355 OBD_LOG_CANCEL, 2, size,bufs);
356 if (request == NULL) {
358 CERROR("error preparing commit: rc %d\n", rc);
360 spin_lock(&lcm->lcm_llcd_lock);
361 list_splice(&lcd->lcd_llcd_list,
362 &lcm->lcm_llcd_resend);
363 CFS_INIT_LIST_HEAD(&lcd->lcd_llcd_list);
364 spin_unlock(&lcm->lcm_llcd_lock);
368 /* XXX FIXME bug 249, 5515 */
369 request->rq_request_portal = LDLM_CANCEL_REQUEST_PORTAL;
370 request->rq_reply_portal = LDLM_CANCEL_REPLY_PORTAL;
372 ptlrpc_req_set_repsize(request, 1, NULL);
373 mutex_down(&llcd->llcd_ctxt->loc_sem);
374 if (llcd->llcd_ctxt->loc_imp == NULL) {
375 mutex_up(&llcd->llcd_ctxt->loc_sem);
376 CWARN("import will be destroyed, put "
377 "llcd %p:%p\n", llcd, llcd->llcd_ctxt);
379 ptlrpc_req_finished(request);
382 mutex_up(&llcd->llcd_ctxt->loc_sem);
383 rc = ptlrpc_queue_wait(request);
384 ptlrpc_req_finished(request);
386 /* If the RPC failed, we put this and the remaining
387 * messages onto the resend list for another time. */
393 CERROR("commit %p:%p drop %d cookies: rc %d\n",
394 llcd, llcd->llcd_ctxt,
395 (int)(llcd->llcd_cookiebytes /
396 sizeof(*llcd->llcd_cookies)), rc);
401 sending_list = &lcm->lcm_llcd_resend;
402 if (!list_empty(sending_list))
407 /* If we are force exiting, just drop all of the cookies. */
408 if (lcm->lcm_flags & LLOG_LCM_FL_EXIT_FORCE) {
409 spin_lock(&lcm->lcm_llcd_lock);
410 list_splice(&lcm->lcm_llcd_pending, &lcd->lcd_llcd_list);
411 list_splice(&lcm->lcm_llcd_resend, &lcd->lcd_llcd_list);
412 list_splice(&lcm->lcm_llcd_free, &lcd->lcd_llcd_list);
413 spin_unlock(&lcm->lcm_llcd_lock);
415 list_for_each_entry_safe(llcd, n, &lcd->lcd_llcd_list,llcd_list)
419 spin_lock(&lcm->lcm_thread_lock);
420 list_del(&lcd->lcd_lcm_list);
421 spin_unlock(&lcm->lcm_thread_lock);
422 OBD_FREE(lcd, sizeof(*lcd));
424 CDEBUG(D_HA, "%s exiting\n", cfs_curproc_comm());
426 spin_lock(&lcm->lcm_thread_lock);
427 atomic_dec(&lcm->lcm_thread_total);
428 spin_unlock(&lcm->lcm_thread_lock);
429 cfs_waitq_signal(&lcm->lcm_waitq);
434 int llog_start_commit_thread(void)
439 if (atomic_read(&lcm->lcm_thread_total) >= lcm->lcm_thread_max)
442 rc = cfs_kernel_thread(log_commit_thread, lcm, CLONE_VM | CLONE_FILES);
444 CERROR("error starting thread #%d: %d\n",
445 atomic_read(&lcm->lcm_thread_total), rc);
451 EXPORT_SYMBOL(llog_start_commit_thread);
453 static struct llog_process_args {
454 struct semaphore llpa_sem;
455 struct llog_ctxt *llpa_ctxt;
460 int llog_init_commit_master(void)
462 CFS_INIT_LIST_HEAD(&lcm->lcm_thread_busy);
463 CFS_INIT_LIST_HEAD(&lcm->lcm_thread_idle);
464 spin_lock_init(&lcm->lcm_thread_lock);
465 atomic_set(&lcm->lcm_thread_numidle, 0);
466 cfs_waitq_init(&lcm->lcm_waitq);
467 CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_pending);
468 CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_resend);
469 CFS_INIT_LIST_HEAD(&lcm->lcm_llcd_free);
470 spin_lock_init(&lcm->lcm_llcd_lock);
471 atomic_set(&lcm->lcm_llcd_numfree, 0);
472 lcm->lcm_llcd_minfree = 0;
473 lcm->lcm_thread_max = 5;
474 /* FIXME initialize semaphore for llog_process_args */
475 sema_init(&llpa.llpa_sem, 1);
479 int llog_cleanup_commit_master(int force)
481 lcm->lcm_flags |= LLOG_LCM_FL_EXIT;
483 lcm->lcm_flags |= LLOG_LCM_FL_EXIT_FORCE;
484 cfs_waitq_signal(&lcm->lcm_waitq);
486 wait_event_interruptible(lcm->lcm_waitq,
487 atomic_read(&lcm->lcm_thread_total) == 0);
491 static int log_process_thread(void *args)
493 struct llog_process_args *data = args;
494 struct llog_ctxt *ctxt = data->llpa_ctxt;
495 void *cb = data->llpa_cb;
496 struct llog_logid logid = *(struct llog_logid *)(data->llpa_arg);
497 struct llog_handle *llh = NULL;
501 mutex_up(&data->llpa_sem);
502 ptlrpc_daemonize("llog_process"); /* thread does IO to log files */
504 rc = llog_create(ctxt, &llh, &logid, NULL);
506 CERROR("llog_create failed %d\n", rc);
509 rc = llog_init_handle(llh, LLOG_F_IS_CAT, NULL);
511 CERROR("llog_init_handle failed %d\n", rc);
516 rc = llog_cat_process(llh, (llog_cb_t)cb, NULL);
517 if (rc != LLOG_PROC_BREAK)
518 CERROR("llog_cat_process failed %d\n", rc);
520 CWARN("no callback function for recovery\n");
523 CDEBUG(D_HA, "send llcd %p:%p forcibly after recovery\n",
524 ctxt->loc_llcd, ctxt);
525 llog_sync(ctxt, NULL);
527 rc = llog_cat_put(llh);
529 CERROR("llog_cat_put failed %d\n", rc);
534 static int llog_recovery_generic(struct llog_ctxt *ctxt, void *handle,void *arg)
539 mutex_down(&llpa.llpa_sem);
540 llpa.llpa_ctxt = ctxt;
541 llpa.llpa_cb = handle;
544 rc = cfs_kernel_thread(log_process_thread, &llpa, CLONE_VM | CLONE_FILES);
546 CERROR("error starting log_process_thread: %d\n", rc);
548 CDEBUG(D_HA, "log_process_thread: %d\n", rc);
555 int llog_repl_connect(struct llog_ctxt *ctxt, int count,
556 struct llog_logid *logid, struct llog_gen *gen,
557 struct obd_uuid *uuid)
559 struct llog_canceld_ctxt *llcd;
563 /* send back llcd before recovery from llog */
564 if (ctxt->loc_llcd != NULL) {
565 CWARN("llcd %p:%p not empty\n", ctxt->loc_llcd, ctxt);
566 llog_sync(ctxt, NULL);
569 mutex_down(&ctxt->loc_sem);
570 ctxt->loc_gen = *gen;
573 CERROR("couldn't get an llcd\n");
574 mutex_up(&ctxt->loc_sem);
577 llcd->llcd_ctxt = ctxt;
578 ctxt->loc_llcd = llcd;
579 mutex_up(&ctxt->loc_sem);
581 rc = llog_recovery_generic(ctxt, ctxt->llog_proc_cb, logid);
583 CERROR("error recovery process: %d\n", rc);
587 EXPORT_SYMBOL(llog_repl_connect);
589 #else /* !__KERNEL__ */
591 int llog_obd_repl_cancel(struct llog_ctxt *ctxt,
592 struct lov_stripe_md *lsm, int count,
593 struct llog_cookie *cookies, int flags)