4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/osp/osp_sync.c
34 * Lustre OST Proxy Device
36 * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
37 * Author: Mikhail Pershin <mike.pershin@intel.com>
40 #define DEBUG_SUBSYSTEM S_MDS
42 #include <linux/kthread.h>
43 #include <linux/delay.h>
44 #include <lustre_log.h>
45 #include <lustre_update.h>
46 #include "osp_internal.h"
49 * this is a components of OSP implementing synchronization between MDS and OST
50 * it llogs all interesting changes (currently it's uig/gid change and object
51 * destroy) atomically, then makes sure changes hit OST storage
53 * we have 4 queues of work:
55 * the first queue is llog itself, once read a change is stored in 2nd queue
56 * in form of RPC (but RPC isn't fired yet).
58 * the second queue (opd_sync_waiting_for_commit) holds changes awaiting local
59 * commit. once change is committed locally it migrates onto 3rd queue.
61 * the third queue (opd_sync_committed_here) holds changes committed locally,
62 * but not sent to OST (as the pipe can be full). once pipe becomes non-full
63 * we take a change from the queue and fire corresponded RPC.
65 * once RPC is reported committed by OST (using regular last_committed mech.)
66 * the change jumps into 4th queue (opd_sync_committed_there), now we can
67 * cancel corresponded llog record and release RPC
69 * opd_sync_changes is a number of unread llog records (to be processed).
70 * notice this number doesn't include llog records from previous boots.
71 * with OSP_SYNC_THRESHOLD we try to batch processing a bit (TO BE IMPLEMENTED)
73 * opd_sync_rpcs_in_progress is total number of requests in above 2-4 queues.
74 * we control this with OSP_MAX_RPCS_IN_PROGRESS so that OSP don't consume
75 * too much memory -- how to deal with 1000th OSTs ? batching could help?
77 * opd_sync_rpcs_in_flight is a number of RPC in flight.
78 * we control this with OSP_MAX_RPCS_IN_FLIGHT
81 /* XXX: do math to learn reasonable threshold
82 * should it be ~ number of changes fitting bulk? */
84 #define OSP_SYNC_THRESHOLD 10
85 #define OSP_MAX_RPCS_IN_FLIGHT 8
86 #define OSP_MAX_RPCS_IN_PROGRESS 4096
88 #define OSP_JOB_MAGIC 0x26112005
90 struct osp_job_req_args {
91 /** bytes reserved for ptlrpc_replay_req() */
92 struct ptlrpc_replay_async_args jra_raa;
93 struct list_head jra_committed_link;
94 struct list_head jra_in_flight_link;
95 struct llog_cookie jra_lcookie;
99 static int osp_sync_add_commit_cb(const struct lu_env *env,
100 struct osp_device *d, struct thandle *th);
102 static inline int osp_sync_running(struct osp_device *d)
104 return !!(d->opd_sync_thread.t_flags & SVC_RUNNING);
108 * Check status: whether OSP thread has stopped
110 * \param[in] d OSP device
112 * \retval 0 still running
115 static inline int osp_sync_stopped(struct osp_device *d)
117 return !!(d->opd_sync_thread.t_flags & SVC_STOPPED);
121 ** Check for new changes to sync
123 * \param[in] d OSP device
125 * \retval 1 there are changes
126 * \retval 0 there are no changes
128 static inline int osp_sync_has_new_job(struct osp_device *d)
130 return atomic_read(&d->opd_sync_changes) > 0 ||
131 d->opd_sync_prev_done == 0;
134 static inline int osp_sync_in_flight_conflict(struct osp_device *d,
135 struct llog_rec_hdr *h)
137 struct osp_job_req_args *jra;
141 if (h == NULL || h->lrh_type == LLOG_GEN_REC ||
142 list_empty(&d->opd_sync_in_flight_list))
145 memset(&ostid, 0, sizeof(ostid));
146 switch (h->lrh_type) {
147 case MDS_UNLINK_REC: {
148 struct llog_unlink_rec *unlink = (struct llog_unlink_rec *)h;
150 ostid_set_seq(&ostid, unlink->lur_oseq);
151 if (ostid_set_id(&ostid, unlink->lur_oid)) {
152 CERROR("Bad %llu to set " DOSTID "\n",
153 (unsigned long long)(unlink->lur_oid),
159 case MDS_UNLINK64_REC:
160 fid_to_ostid(&((struct llog_unlink64_rec *)h)->lur_fid, &ostid);
162 case MDS_SETATTR64_REC:
163 ostid = ((struct llog_setattr64_rec *)h)->lsr_oi;
169 spin_lock(&d->opd_sync_lock);
170 list_for_each_entry(jra, &d->opd_sync_in_flight_list,
171 jra_in_flight_link) {
172 struct ptlrpc_request *req;
173 struct ost_body *body;
175 LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
177 req = container_of((void *)jra, struct ptlrpc_request,
179 body = req_capsule_client_get(&req->rq_pill,
183 if (memcmp(&ostid, &body->oa.o_oi, sizeof(ostid)) == 0) {
188 spin_unlock(&d->opd_sync_lock);
193 static inline int osp_sync_rpcs_in_progress_low(struct osp_device *d)
195 return atomic_read(&d->opd_sync_rpcs_in_progress) <
196 d->opd_sync_max_rpcs_in_progress;
200 * Check for room in the network pipe to OST
202 * \param[in] d OSP device
204 * \retval 1 there is room
205 * \retval 0 no room, the pipe is full
207 static inline int osp_sync_rpcs_in_flight_low(struct osp_device *d)
209 return atomic_read(&d->opd_sync_rpcs_in_flight) <
210 d->opd_sync_max_rpcs_in_flight;
214 * Wake up check for the main sync thread
216 * \param[in] d OSP device
218 * \retval 1 time to wake up
219 * \retval 0 no need to wake up
221 static inline int osp_sync_has_work(struct osp_device *osp)
223 /* has new/old changes and low in-progress? */
224 if (osp_sync_has_new_job(osp) && osp_sync_rpcs_in_progress_low(osp) &&
225 osp_sync_rpcs_in_flight_low(osp) && osp->opd_imp_connected)
228 /* has remotely committed? */
229 if (!list_empty(&osp->opd_sync_committed_there))
235 void osp_sync_check_for_work(struct osp_device *osp)
237 if (osp_sync_has_work(osp))
238 wake_up(&osp->opd_sync_waitq);
241 static inline __u64 osp_sync_correct_id(struct osp_device *d,
242 struct llog_rec_hdr *rec)
245 * llog use cyclic store with 32 bit lrh_id
246 * so overflow lrh_id is possible. Range between
247 * last_processed and last_committed is less than
248 * 64745 ^ 2 and less than 2^32 - 1
250 __u64 correct_id = d->opd_sync_last_committed_id;
252 if ((correct_id & 0xffffffffULL) < rec->lrh_id)
253 correct_id -= 0x100000000ULL;
255 correct_id &= ~0xffffffffULL;
256 correct_id |= rec->lrh_id;
262 * Check and return ready-for-new status.
264 * The thread processing llog record uses this function to check whether
265 * it's time to take another record and process it. The number of conditions
266 * must be met: the connection should be ready, RPCs in flight not exceeding
267 * the limit, the record is committed locally, etc (see the lines below).
269 * \param[in] d OSP device
270 * \param[in] rec next llog record to process
272 * \retval 0 not ready
275 static inline int osp_sync_can_process_new(struct osp_device *d,
276 struct llog_rec_hdr *rec)
280 if (unlikely(atomic_read(&d->opd_sync_barrier) > 0))
282 if (unlikely(osp_sync_in_flight_conflict(d, rec)))
284 if (!osp_sync_rpcs_in_progress_low(d))
286 if (!osp_sync_rpcs_in_flight_low(d))
288 if (!d->opd_imp_connected)
290 if (d->opd_sync_prev_done == 0)
292 if (atomic_read(&d->opd_sync_changes) == 0)
296 /* notice "<" not "<=" */
297 if (osp_sync_correct_id(d, rec) < d->opd_sync_last_committed_id)
303 * Declare intention to add a new change.
305 * With regard to OSD API, we have to declare any changes ahead. In this
306 * case we declare an intention to add a llog record representing the
307 * change on the local storage.
309 * \param[in] env LU environment provided by the caller
310 * \param[in] o OSP object
311 * \param[in] type type of change: MDS_UNLINK64_REC or MDS_SETATTR64_REC
312 * \param[in] th transaction handle (local)
314 * \retval 0 on success
315 * \retval negative negated errno on error
317 int osp_sync_declare_add(const struct lu_env *env, struct osp_object *o,
318 enum llog_op_type type, struct thandle *th)
320 struct osp_thread_info *osi = osp_env_info(env);
321 struct osp_device *d = lu2osp_dev(o->opo_obj.do_lu.lo_dev);
322 struct llog_ctxt *ctxt;
323 struct thandle *storage_th;
328 /* it's a layering violation, to access internals of th,
329 * but we can do this as a sanity check, for a while */
330 LASSERT(th->th_top != NULL);
331 storage_th = thandle_get_sub_by_dt(env, th->th_top, d->opd_storage);
332 if (IS_ERR(storage_th))
333 RETURN(PTR_ERR(storage_th));
336 case MDS_UNLINK64_REC:
337 osi->osi_hdr.lrh_len = sizeof(struct llog_unlink64_rec);
339 case MDS_SETATTR64_REC:
340 osi->osi_hdr.lrh_len = sizeof(struct llog_setattr64_rec_v2);
346 ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
348 /* for a reason OSP wasn't able to open llog,
349 * just skip logging this operation and hope
350 * LFSCK will fix it eventually */
351 CERROR("logging isn't available, run LFSCK\n");
355 rc = llog_declare_add(env, ctxt->loc_handle, &osi->osi_hdr,
363 * Generate a llog record for a given change.
365 * Generates a llog record for the change passed. The change can be of two
366 * types: unlink and setattr. The record gets an ID which later will be
367 * used to track commit status of the change. For unlink changes, the caller
368 * can supply a starting FID and the count of the objects to destroy. For
369 * setattr the caller should apply attributes to apply.
372 * \param[in] env LU environment provided by the caller
373 * \param[in] d OSP device
374 * \param[in] fid fid of the object the change should be applied to
375 * \param[in] type type of change: MDS_UNLINK64_REC or MDS_SETATTR64_REC
376 * \param[in] count count of objects to destroy
377 * \param[in] th transaction handle (local)
378 * \param[in] attr attributes for setattr
380 * \retval 0 on success
381 * \retval negative negated errno on error
383 static int osp_sync_add_rec(const struct lu_env *env, struct osp_device *d,
384 const struct lu_fid *fid, enum llog_op_type type,
385 int count, struct thandle *th,
386 const struct lu_attr *attr)
388 struct osp_thread_info *osi = osp_env_info(env);
389 struct llog_ctxt *ctxt;
390 struct thandle *storage_th;
391 bool immediate_commit_cb = false;
396 /* it's a layering violation, to access internals of th,
397 * but we can do this as a sanity check, for a while */
398 LASSERT(th->th_top != NULL);
399 storage_th = thandle_get_sub_by_dt(env, th->th_top, d->opd_storage);
400 if (IS_ERR(storage_th))
401 RETURN(PTR_ERR(storage_th));
404 case MDS_UNLINK64_REC:
405 osi->osi_hdr.lrh_len = sizeof(osi->osi_unlink);
406 osi->osi_hdr.lrh_type = MDS_UNLINK64_REC;
407 osi->osi_unlink.lur_fid = *fid;
408 osi->osi_unlink.lur_count = count;
410 case MDS_SETATTR64_REC:
411 rc = fid_to_ostid(fid, &osi->osi_oi);
413 osi->osi_hdr.lrh_len = sizeof(osi->osi_setattr);
414 osi->osi_hdr.lrh_type = MDS_SETATTR64_REC;
415 osi->osi_setattr.lsr_oi = osi->osi_oi;
417 osi->osi_setattr.lsr_uid = attr->la_uid;
418 osi->osi_setattr.lsr_gid = attr->la_gid;
419 osi->osi_setattr.lsr_layout_version = attr->la_layout_version;
420 osi->osi_setattr.lsr_projid = attr->la_projid;
421 osi->osi_setattr.lsr_valid =
422 ((attr->la_valid & LA_UID) ? OBD_MD_FLUID : 0) |
423 ((attr->la_valid & LA_GID) ? OBD_MD_FLGID : 0) |
424 ((attr->la_valid & LA_PROJID) ? OBD_MD_FLPROJID : 0);
425 if (attr->la_valid & LA_LAYOUT_VERSION) {
426 osi->osi_setattr.lsr_valid |= OBD_MD_LAYOUT_VERSION;
428 /* FLR: the layout version has to be transferred to
429 * OST objects ASAP, otherwise clients will have to
430 * experience delay to be able to write OST objects. */
431 immediate_commit_cb = true;
438 /* we keep the same id, but increment it when the callback
439 * is registered, so that all records upto the one taken
440 * by the callback are subject to processing */
441 spin_lock(&d->opd_sync_lock);
442 osi->osi_hdr.lrh_id = d->opd_sync_last_used_id;
443 spin_unlock(&d->opd_sync_lock);
445 ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
447 /* see comment in osp_sync_declare_add() */
451 rc = llog_add(env, ctxt->loc_handle, &osi->osi_hdr, &osi->osi_cookie,
455 if (likely(rc >= 0)) {
456 CDEBUG(D_OTHER, "%s: new record "DFID":%x.%u: rc = %d\n",
457 d->opd_obd->obd_name,
458 PFID(&osi->osi_cookie.lgc_lgl.lgl_oi.oi_fid),
459 osi->osi_cookie.lgc_lgl.lgl_ogen,
460 osi->osi_cookie.lgc_index, rc);
461 atomic_inc(&d->opd_sync_changes);
464 if (immediate_commit_cb)
465 rc = osp_sync_add_commit_cb(env, d, th);
467 rc = osp_sync_add_commit_cb_1s(env, d, th);
469 /* return 0 always here, error case just cause no llog record */
473 int osp_sync_add(const struct lu_env *env, struct osp_object *o,
474 enum llog_op_type type, struct thandle *th,
475 const struct lu_attr *attr)
477 return osp_sync_add_rec(env, lu2osp_dev(o->opo_obj.do_lu.lo_dev),
478 lu_object_fid(&o->opo_obj.do_lu), type, 1,
482 int osp_sync_gap(const struct lu_env *env, struct osp_device *d,
483 struct lu_fid *fid, int lost, struct thandle *th)
485 return osp_sync_add_rec(env, d, fid, MDS_UNLINK64_REC, lost, th, NULL);
489 * it's quite obvious we can't maintain all the structures in the memory:
490 * while OST is down, MDS can be processing thousands and thousands of unlinks
491 * filling persistent llogs and in-core respresentation
493 * this doesn't scale at all. so we need basically the following:
494 * a) destroy/setattr append llog records
495 * b) once llog has grown to X records, we process first Y committed records
497 * once record R is found via llog_process(), it becomes committed after any
498 * subsequent commit callback (at the most)
502 * ptlrpc commit callback.
504 * The callback is called by PTLRPC when a RPC is reported committed by the
505 * target (OST). We register the callback for the every RPC applying a change
506 * from the llog. This way we know then the llog records can be cancelled.
507 * Notice the callback can be called when OSP is finishing. We can detect this
508 * checking that actual transno in the request is less or equal of known
509 * committed transno (see osp_sync_process_committed() for the details).
510 * XXX: this is pretty expensive and can be improved later using batching.
512 * \param[in] req request
514 static void osp_sync_request_commit_cb(struct ptlrpc_request *req)
516 struct osp_device *d = req->rq_cb_data;
517 struct osp_job_req_args *jra;
519 CDEBUG(D_HA, "commit req %p, transno %llu\n", req, req->rq_transno);
521 if (unlikely(req->rq_transno == 0))
524 /* do not do any opd_sync_rpcs_* accounting here
525 * it's done in osp_sync_interpret sooner or later */
528 jra = ptlrpc_req_async_args(jra, req);
529 LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
530 LASSERT(list_empty(&jra->jra_committed_link));
532 ptlrpc_request_addref(req);
534 spin_lock(&d->opd_sync_lock);
535 list_add(&jra->jra_committed_link, &d->opd_sync_committed_there);
536 spin_unlock(&d->opd_sync_lock);
538 /* XXX: some batching wouldn't hurt */
539 wake_up(&d->opd_sync_waitq);
543 * RPC interpretation callback.
545 * The callback is called by ptlrpc when RPC is replied. Now we have to decide
547 * - put request on a special list to wait until it's committed by the target,
548 * if the request is successful
549 * - schedule llog record cancel if no target object is found
550 * - try later (essentially after reboot) in case of unexpected error
552 * \param[in] env LU environment provided by the caller
553 * \param[in] req request replied
554 * \param[in] aa callback data
555 * \param[in] rc result of RPC
559 static int osp_sync_interpret(const struct lu_env *env,
560 struct ptlrpc_request *req, void *args, int rc)
562 struct osp_job_req_args *jra = args;
563 struct osp_device *d = req->rq_cb_data;
565 if (jra->jra_magic != OSP_JOB_MAGIC) {
566 DEBUG_REQ(D_ERROR, req, "bad magic %u", jra->jra_magic);
571 CDEBUG(D_HA, "reply req %p/%d, rc %d, transno %u\n", req,
572 atomic_read(&req->rq_refcount),
573 rc, (unsigned) req->rq_transno);
577 * we tried to destroy object or update attributes,
578 * but object doesn't exist anymore - cancell llog record
580 LASSERT(req->rq_transno == 0);
581 LASSERT(list_empty(&jra->jra_committed_link));
583 ptlrpc_request_addref(req);
585 spin_lock(&d->opd_sync_lock);
586 list_add(&jra->jra_committed_link,
587 &d->opd_sync_committed_there);
588 spin_unlock(&d->opd_sync_lock);
590 wake_up(&d->opd_sync_waitq);
592 struct obd_import *imp = req->rq_import;
594 * error happened, we'll try to repeat on next boot ?
596 LASSERTF(req->rq_transno == 0 || rc == -EIO || rc == -EROFS ||
597 req->rq_import_generation < imp->imp_generation,
598 "transno %llu, rc %d, gen: req %d, imp %d\n",
599 req->rq_transno, rc, req->rq_import_generation,
600 imp->imp_generation);
601 if (req->rq_transno == 0) {
602 /* this is the last time we see the request
603 * if transno is not zero, then commit cb
604 * will be called at some point */
605 LASSERT(atomic_read(&d->opd_sync_rpcs_in_progress) > 0);
606 atomic_dec(&d->opd_sync_rpcs_in_progress);
609 wake_up(&d->opd_sync_waitq);
610 } else if (d->opd_pre != NULL &&
611 unlikely(d->opd_pre_status == -ENOSPC)) {
613 * if current status is -ENOSPC (lack of free space on OST)
614 * then we should poll OST immediately once object destroy
617 osp_statfs_need_now(d);
620 spin_lock(&d->opd_sync_lock);
621 list_del_init(&jra->jra_in_flight_link);
622 spin_unlock(&d->opd_sync_lock);
623 LASSERT(atomic_read(&d->opd_sync_rpcs_in_flight) > 0);
624 atomic_dec(&d->opd_sync_rpcs_in_flight);
625 if (unlikely(atomic_read(&d->opd_sync_barrier) > 0))
626 wake_up(&d->opd_sync_barrier_waitq);
627 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
628 d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight),
629 atomic_read(&d->opd_sync_rpcs_in_progress));
631 osp_sync_check_for_work(d);
637 ** Add request to ptlrpc queue.
639 * This is just a tiny helper function to put the request on the sending list
641 * \param[in] d OSP device
642 * \param[in] llh llog handle where the record is stored
643 * \param[in] h llog record
644 * \param[in] req request
646 static void osp_sync_send_new_rpc(struct osp_device *d,
647 struct llog_handle *llh,
648 struct llog_rec_hdr *h,
649 struct ptlrpc_request *req)
651 struct osp_job_req_args *jra;
653 LASSERT(atomic_read(&d->opd_sync_rpcs_in_flight) <=
654 d->opd_sync_max_rpcs_in_flight);
656 jra = ptlrpc_req_async_args(jra, req);
657 jra->jra_magic = OSP_JOB_MAGIC;
658 jra->jra_lcookie.lgc_lgl = llh->lgh_id;
659 jra->jra_lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
660 jra->jra_lcookie.lgc_index = h->lrh_index;
661 INIT_LIST_HEAD(&jra->jra_committed_link);
662 spin_lock(&d->opd_sync_lock);
663 list_add_tail(&jra->jra_in_flight_link, &d->opd_sync_in_flight_list);
664 spin_unlock(&d->opd_sync_lock);
666 ptlrpcd_add_req(req);
671 * Allocate and prepare RPC for a new change.
673 * The function allocates and initializes an RPC which will be sent soon to
674 * apply the change to the target OST. The request is initialized from the
675 * llog record passed. Notice only the fields common to all type of changes
678 * \param[in] d OSP device
679 * \param[in] op type of the change
680 * \param[in] format request format to be used
682 * \retval pointer new request on success
683 * \retval ERR_PTR(errno) on error
685 static struct ptlrpc_request *osp_sync_new_job(struct osp_device *d,
687 const struct req_format *format)
689 struct ptlrpc_request *req;
690 struct obd_import *imp;
693 /* Prepare the request */
694 imp = d->opd_obd->u.cli.cl_import;
697 if (OBD_FAIL_CHECK(OBD_FAIL_OSP_CHECK_ENOMEM))
698 RETURN(ERR_PTR(-ENOMEM));
700 req = ptlrpc_request_alloc(imp, format);
702 RETURN(ERR_PTR(-ENOMEM));
704 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, op);
706 ptlrpc_req_finished(req);
710 req->rq_interpret_reply = osp_sync_interpret;
711 req->rq_commit_cb = osp_sync_request_commit_cb;
714 ptlrpc_request_set_replen(req);
720 * Generate a request for setattr change.
722 * The function prepares a new RPC, initializes it with setattr specific
723 * bits and send the RPC.
725 * \param[in] d OSP device
726 * \param[in] llh llog handle where the record is stored
727 * \param[in] h llog record
729 * \retval 0 on success
730 * \retval 1 on invalid record
731 * \retval negative negated errno on error
733 static int osp_sync_new_setattr_job(struct osp_device *d,
734 struct llog_handle *llh,
735 struct llog_rec_hdr *h)
737 struct llog_setattr64_rec *rec = (struct llog_setattr64_rec *)h;
738 struct ptlrpc_request *req;
739 struct ost_body *body;
742 LASSERT(h->lrh_type == MDS_SETATTR64_REC);
744 if (OBD_FAIL_CHECK(OBD_FAIL_OSP_CHECK_INVALID_REC))
747 /* lsr_valid can only be 0 or HAVE OBD_MD_{FLUID, FLGID, FLPROJID} set,
748 * so no bits other than these should be set. */
749 if ((rec->lsr_valid & ~(OBD_MD_FLUID | OBD_MD_FLGID |
750 OBD_MD_FLPROJID | OBD_MD_LAYOUT_VERSION)) != 0) {
751 CERROR("%s: invalid setattr record, lsr_valid:%llu\n",
752 d->opd_obd->obd_name, rec->lsr_valid);
753 /* return 1 on invalid record */
757 req = osp_sync_new_job(d, OST_SETATTR, &RQF_OST_SETATTR);
759 RETURN(PTR_ERR(req));
761 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
763 body->oa.o_oi = rec->lsr_oi;
764 body->oa.o_uid = rec->lsr_uid;
765 body->oa.o_gid = rec->lsr_gid;
766 body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
767 if (h->lrh_len > sizeof(struct llog_setattr64_rec)) {
768 struct llog_setattr64_rec_v2 *rec_v2 = (typeof(rec_v2))rec;
769 body->oa.o_projid = rec_v2->lsr_projid;
770 body->oa.o_layout_version = rec_v2->lsr_layout_version;
773 /* old setattr record (prior 2.6.0) doesn't have 'valid' stored,
774 * we assume that both UID and GID are valid in that case. */
775 if (rec->lsr_valid == 0)
776 body->oa.o_valid |= (OBD_MD_FLUID | OBD_MD_FLGID);
778 body->oa.o_valid |= rec->lsr_valid;
780 if (body->oa.o_valid & OBD_MD_LAYOUT_VERSION) {
781 OBD_FAIL_TIMEOUT(OBD_FAIL_FLR_LV_DELAY, cfs_fail_val);
782 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_FLR_LV_INC)))
783 ++body->oa.o_layout_version;
786 osp_sync_send_new_rpc(d, llh, h, req);
791 * Generate a request for unlink change.
793 * The function prepares a new RPC, initializes it with unlink(destroy)
794 * specific bits and sends the RPC. The function is used to handle
795 * llog_unlink_rec which were used in the older versions of Lustre.
796 * Current version uses llog_unlink_rec64.
798 * \param[in] d OSP device
799 * \param[in] llh llog handle where the record is stored
800 * \param[in] h llog record
802 * \retval 0 on success
803 * \retval negative negated errno on error
805 static int osp_sync_new_unlink_job(struct osp_device *d,
806 struct llog_handle *llh,
807 struct llog_rec_hdr *h)
809 struct llog_unlink_rec *rec = (struct llog_unlink_rec *)h;
810 struct ptlrpc_request *req;
811 struct ost_body *body;
815 LASSERT(h->lrh_type == MDS_UNLINK_REC);
817 req = osp_sync_new_job(d, OST_DESTROY, &RQF_OST_DESTROY);
819 RETURN(PTR_ERR(req));
821 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
823 ostid_set_seq(&body->oa.o_oi, rec->lur_oseq);
824 rc = ostid_set_id(&body->oa.o_oi, rec->lur_oid);
827 body->oa.o_misc = rec->lur_count;
828 body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
830 body->oa.o_valid |= OBD_MD_FLOBJCOUNT;
832 osp_sync_send_new_rpc(d, llh, h, req);
837 * Generate a request for unlink change.
839 * The function prepares a new RPC, initializes it with unlink(destroy)
840 * specific bits and sends the RPC. Depending on the target (MDT or OST)
841 * two different protocols are used. For MDT we use OUT (basically OSD API
842 * updates transferred via a network). For OST we still use the old
843 * protocol (OBD?), originally for compatibility. Later we can start to
844 * use OUT for OST as well, this will allow batching and better code
847 * \param[in] d OSP device
848 * \param[in] llh llog handle where the record is stored
849 * \param[in] h llog record
851 * \retval 0 on success
852 * \retval negative negated errno on error
854 static int osp_sync_new_unlink64_job(struct osp_device *d,
855 struct llog_handle *llh,
856 struct llog_rec_hdr *h)
858 struct llog_unlink64_rec *rec = (struct llog_unlink64_rec *)h;
859 struct ptlrpc_request *req = NULL;
860 struct ost_body *body;
864 LASSERT(h->lrh_type == MDS_UNLINK64_REC);
865 req = osp_sync_new_job(d, OST_DESTROY, &RQF_OST_DESTROY);
867 RETURN(PTR_ERR(req));
869 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
872 rc = fid_to_ostid(&rec->lur_fid, &body->oa.o_oi);
875 body->oa.o_misc = rec->lur_count;
876 body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID |
878 osp_sync_send_new_rpc(d, llh, h, req);
883 * Process llog records.
885 * This function is called to process the llog records committed locally.
886 * In the recovery model used by OSP we can apply a change to a remote
887 * target once corresponding transaction (like posix unlink) is committed
888 * locally so can't revert.
889 * Depending on the llog record type, a given handler is called that is
890 * responsible for preparing and sending the RPC to apply the change.
891 * Special record type LLOG_GEN_REC marking a reboot is cancelled right away.
893 * \param[in] env LU environment provided by the caller
894 * \param[in] d OSP device
895 * \param[in] llh llog handle where the record is stored
896 * \param[in] rec llog record
898 static void osp_sync_process_record(const struct lu_env *env,
899 struct osp_device *d,
900 struct llog_handle *llh,
901 struct llog_rec_hdr *rec)
903 struct llog_handle *cathandle = llh->u.phd.phd_cat_handle;
904 struct llog_cookie cookie;
909 cookie.lgc_lgl = llh->lgh_id;
910 cookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
911 cookie.lgc_index = rec->lrh_index;
913 d->opd_sync_last_catalog_idx = llh->lgh_hdr->llh_cat_idx;
915 if (unlikely(rec->lrh_type == LLOG_GEN_REC)) {
916 struct llog_gen_rec *gen = (struct llog_gen_rec *)rec;
918 /* we're waiting for the record generated by this instance */
919 LASSERT(d->opd_sync_prev_done == 0);
920 if (!memcmp(&d->opd_sync_generation, &gen->lgr_gen,
921 sizeof(gen->lgr_gen))) {
922 CDEBUG(D_HA, "processed all old entries\n");
923 d->opd_sync_prev_done = 1;
926 /* cancel any generation record */
927 rc = llog_cat_cancel_records(env, cathandle, 1, &cookie);
929 /* flush all pending records ASAP */
930 osp_sync_force(env, d);
936 * now we prepare and fill requests to OST, put them on the queue
937 * and fire after next commit callback
940 /* notice we increment counters before sending RPC, to be consistent
941 * in RPC interpret callback which may happen very quickly */
942 atomic_inc(&d->opd_sync_rpcs_in_flight);
943 atomic_inc(&d->opd_sync_rpcs_in_progress);
945 switch (rec->lrh_type) {
946 /* case MDS_UNLINK_REC is kept for compatibility */
948 rc = osp_sync_new_unlink_job(d, llh, rec);
950 case MDS_UNLINK64_REC:
951 rc = osp_sync_new_unlink64_job(d, llh, rec);
953 case MDS_SETATTR64_REC:
954 rc = osp_sync_new_setattr_job(d, llh, rec);
957 CERROR("%s: unknown record type: %x\n", d->opd_obd->obd_name,
959 /* treat "unknown record type" as "invalid" */
964 /* For all kinds of records, not matter successful or not,
965 * we should decrease changes and bump last_processed_id.
967 if (d->opd_sync_prev_done) {
968 LASSERT(atomic_read(&d->opd_sync_changes) > 0);
969 atomic_dec(&d->opd_sync_changes);
970 wake_up(&d->opd_sync_barrier_waitq);
972 atomic64_inc(&d->opd_sync_processed_recs);
974 atomic_dec(&d->opd_sync_rpcs_in_flight);
975 atomic_dec(&d->opd_sync_rpcs_in_progress);
978 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
979 d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight),
980 atomic_read(&d->opd_sync_rpcs_in_progress));
982 /* Delete the invalid record */
984 rc = llog_cat_cancel_records(env, cathandle, 1, &cookie);
986 CERROR("%s: can't delete invalid record: "
987 "fid = "DFID", rec_id = %u, rc = %d\n",
988 d->opd_obd->obd_name,
989 PFID(lu_object_fid(&cathandle->lgh_obj->do_lu)),
993 CDEBUG(D_HA, "found record %x, %d, idx %u, id %u\n",
994 rec->lrh_type, rec->lrh_len, rec->lrh_index, rec->lrh_id);
1000 * Cancel llog records for the committed changes.
1002 * The function walks through the list of the committed RPCs and cancels
1003 * corresponding llog records. see osp_sync_request_commit_cb() for the
1006 * \param[in] env LU environment provided by the caller
1007 * \param[in] d OSP device
1009 static void osp_sync_process_committed(const struct lu_env *env,
1010 struct osp_device *d)
1012 struct obd_device *obd = d->opd_obd;
1013 struct obd_import *imp = obd->u.cli.cl_import;
1014 struct ost_body *body;
1015 struct ptlrpc_request *req;
1016 struct llog_ctxt *ctxt;
1017 struct llog_handle *llh;
1020 struct list_head *le;
1021 struct llog_logid lgid;
1022 int rc, i, count = 0, done = 0;
1026 if (list_empty(&d->opd_sync_committed_there))
1030 * if current status is -ENOSPC (lack of free space on OST)
1031 * then we should poll OST immediately once object destroy
1033 * notice: we do this upon commit as well because some backends
1034 * (like DMU) do not release space right away.
1036 if (d->opd_pre != NULL && unlikely(d->opd_pre_status == -ENOSPC))
1037 osp_statfs_need_now(d);
1040 * now cancel them all
1041 * XXX: can we improve this using some batching?
1042 * with batch RPC that'll happen automatically?
1043 * XXX: can we store ctxt in lod_device and save few cycles ?
1045 ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1048 llh = ctxt->loc_handle;
1051 spin_lock(&d->opd_sync_lock);
1052 list_splice(&d->opd_sync_committed_there, &list);
1053 INIT_LIST_HEAD(&d->opd_sync_committed_there);
1054 spin_unlock(&d->opd_sync_lock);
1056 list_for_each(le, &list)
1059 OBD_ALLOC_WAIT(arr, sizeof(int) * count);
1063 while (!list_empty(&list)) {
1064 struct osp_job_req_args *jra;
1066 jra = list_entry(list.next, struct osp_job_req_args,
1067 jra_committed_link);
1068 LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
1069 list_del_init(&jra->jra_committed_link);
1071 req = container_of((void *)jra, struct ptlrpc_request,
1073 body = req_capsule_client_get(&req->rq_pill,
1076 /* import can be closing, thus all commit cb's are
1077 * called we can check committness directly */
1078 if (req->rq_import_generation == imp->imp_generation) {
1080 !memcmp(&jra->jra_lcookie.lgc_lgl, &lgid,
1083 lgid = jra->jra_lcookie.lgc_lgl;
1085 arr[i++] = jra->jra_lcookie.lgc_index;
1087 rc = llog_cat_cancel_records(env, llh, 1,
1090 CERROR("%s: can't cancel record: %d\n",
1094 DEBUG_REQ(D_OTHER, req, "imp_committed = %llu",
1095 imp->imp_peer_committed_transno);
1097 ptlrpc_req_finished(req);
1101 rc = llog_cat_cancel_arr_rec(env, llh, &lgid, i, arr);
1104 CERROR("%s: can't cancel %d records rc: %d\n",
1105 obd->obd_name, i, rc);
1107 CDEBUG(D_OTHER, "%s: massive records cancel id "DFID\
1108 " num %d\n", obd->obd_name,
1109 PFID(&lgid.lgl_oi.oi_fid), i);
1112 OBD_FREE(arr, sizeof(int) * count);
1114 llog_ctxt_put(ctxt);
1116 LASSERT(atomic_read(&d->opd_sync_rpcs_in_progress) >= done);
1117 atomic_sub(done, &d->opd_sync_rpcs_in_progress);
1118 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress, done %d\n",
1119 d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight),
1120 atomic_read(&d->opd_sync_rpcs_in_progress), done);
1122 osp_sync_check_for_work(d);
1124 /* wake up the thread if requested to stop:
1125 * it might be waiting for in-progress to complete */
1126 if (unlikely(osp_sync_running(d) == 0))
1127 wake_up(&d->opd_sync_waitq);
1133 * The core of the syncing mechanism.
1135 * This is a callback called by the llog processing function. Essentially it
1136 * suspends llog processing until there is a record to process (it's supposed
1137 * to be committed locally). The function handles RPCs committed by the target
1138 * and cancels corresponding llog records.
1140 * \param[in] env LU environment provided by the caller
1141 * \param[in] llh llog handle we're processing
1142 * \param[in] rec current llog record
1143 * \param[in] data callback data containing a pointer to the device
1145 * \retval 0 to ask the caller (llog_process()) to continue
1146 * \retval LLOG_PROC_BREAK to ask the caller to break
1148 static int osp_sync_process_queues(const struct lu_env *env,
1149 struct llog_handle *llh,
1150 struct llog_rec_hdr *rec,
1153 struct osp_device *d = data;
1156 if (!osp_sync_running(d)) {
1157 CDEBUG(D_HA, "stop llog processing\n");
1158 return LLOG_PROC_BREAK;
1161 /* process requests committed by OST */
1162 osp_sync_process_committed(env, d);
1164 /* if we there are changes to be processed and we have
1165 * resources for this ... do now */
1166 if (osp_sync_can_process_new(d, rec)) {
1168 /* ask llog for another record */
1169 CDEBUG(D_HA, "%u changes, %u in progress,"
1171 atomic_read(&d->opd_sync_changes),
1172 atomic_read(&d->opd_sync_rpcs_in_progress),
1173 atomic_read(&d->opd_sync_rpcs_in_flight));
1176 osp_sync_process_record(env, d, llh, rec);
1180 if (OBD_FAIL_PRECHECK(OBD_FAIL_CATALOG_FULL_CHECK) &&
1182 msleep(1 * MSEC_PER_SEC);
1184 wait_event_idle(d->opd_sync_waitq,
1185 !osp_sync_running(d) ||
1186 osp_sync_can_process_new(d, rec) ||
1187 !list_empty(&d->opd_sync_committed_there));
1194 * This thread runs llog_cat_process() scanner calling our callback
1195 * to process llog records. in the callback we implement tricky
1196 * state machine as we don't want to start scanning of the llog again
1197 * and again, also we don't want to process too many records and send
1198 * too many RPCs a time. so, depending on current load (num of changes
1199 * being synced to OST) the callback can suspend awaiting for some
1200 * new conditions, like syncs completed.
1202 * In order to process llog records left by previous boots and to allow
1203 * llog_process_thread() to find something (otherwise it'd just exit
1204 * immediately) we add a special GENERATATION record on each boot.
1206 * \param[in] _arg a pointer to thread's arguments
1208 * \retval 0 on success
1209 * \retval negative negated errno on error
1211 static int osp_sync_thread(void *_arg)
1213 struct osp_device *d = _arg;
1214 struct ptlrpc_thread *thread = &d->opd_sync_thread;
1215 struct llog_ctxt *ctxt;
1216 struct obd_device *obd = d->opd_obd;
1217 struct llog_handle *llh;
1224 rc = lu_env_init(&env, LCT_LOCAL);
1226 CERROR("%s: can't initialize env: rc = %d\n",
1229 spin_lock(&d->opd_sync_lock);
1230 thread->t_flags = SVC_STOPPED;
1231 spin_unlock(&d->opd_sync_lock);
1232 wake_up(&thread->t_ctl_waitq);
1237 spin_lock(&d->opd_sync_lock);
1238 thread->t_flags = SVC_RUNNING;
1239 spin_unlock(&d->opd_sync_lock);
1240 wake_up(&thread->t_ctl_waitq);
1243 ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1245 CERROR("can't get appropriate context\n");
1246 GOTO(out, rc = -EINVAL);
1249 llh = ctxt->loc_handle;
1251 CERROR("can't get llh\n");
1252 llog_ctxt_put(ctxt);
1253 GOTO(out, rc = -EINVAL);
1257 * Catalog processing stops when it processed last catalog record
1258 * with index equal to the end of catalog bitmap. Or if it is wrapped,
1259 * processing stops with index equal to the lgh_last_idx. We need to
1260 * continue processing.
1262 d->opd_sync_last_catalog_idx = 0;
1266 wrapped = (llh->lgh_hdr->llh_cat_idx >= llh->lgh_last_idx &&
1267 llh->lgh_hdr->llh_count > 1);
1269 if (OBD_FAIL_CHECK(OBD_FAIL_OSP_CANT_PROCESS_LLOG)) {
1273 rc = llog_cat_process(&env, llh, osp_sync_process_queues, d,
1274 d->opd_sync_last_catalog_idx, 0);
1277 size = OBD_FAIL_PRECHECK(OBD_FAIL_CAT_RECORDS) ?
1278 cfs_fail_val : (LLOG_HDR_BITMAP_SIZE(llh->lgh_hdr) - 1);
1279 /* processing reaches catalog bottom */
1280 if (d->opd_sync_last_catalog_idx == size)
1281 d->opd_sync_last_catalog_idx = LLOG_CAT_FIRST;
1282 /* If catalog is wrapped we can`t predict last index of
1283 * processing because lgh_last_idx could be changed.
1284 * Starting form the next one. Index would be increased
1285 * at llog_process_thread
1287 } while (rc == 0 && (wrapped ||
1288 d->opd_sync_last_catalog_idx == LLOG_CAT_FIRST));
1291 if (rc == -EINPROGRESS) {
1292 /* can't access the llog now - OI scrub is trying to fix
1293 * underlying issue. let's wait and try again */
1294 llog_cat_close(&env, llh);
1295 rc = llog_cleanup(&env, ctxt);
1298 schedule_timeout_interruptible(cfs_time_seconds(5));
1302 CERROR("%s: llog process with osp_sync_process_queues "
1303 "failed: %d\n", d->opd_obd->obd_name, rc);
1306 LASSERTF(rc == 0 || rc == LLOG_PROC_BREAK,
1307 "%u changes, %u in progress, %u in flight: %d\n",
1308 atomic_read(&d->opd_sync_changes),
1309 atomic_read(&d->opd_sync_rpcs_in_progress),
1310 atomic_read(&d->opd_sync_rpcs_in_flight), rc);
1312 /* we don't expect llog_process_thread() to exit till umount */
1313 LASSERTF(thread->t_flags != SVC_RUNNING,
1314 "%u changes, %u in progress, %u in flight\n",
1315 atomic_read(&d->opd_sync_changes),
1316 atomic_read(&d->opd_sync_rpcs_in_progress),
1317 atomic_read(&d->opd_sync_rpcs_in_flight));
1319 /* wait till all the requests are completed */
1321 while (atomic_read(&d->opd_sync_rpcs_in_progress) > 0) {
1322 osp_sync_process_committed(&env, d);
1324 rc = wait_event_idle_timeout(
1326 atomic_read(&d->opd_sync_rpcs_in_progress) == 0,
1327 cfs_time_seconds(5));
1330 LASSERTF(count < 10, "%s: %d %d %sempty\n",
1331 d->opd_obd->obd_name,
1332 atomic_read(&d->opd_sync_rpcs_in_progress),
1333 atomic_read(&d->opd_sync_rpcs_in_flight),
1334 list_empty(&d->opd_sync_committed_there) ? "" : "!");
1339 llog_cat_close(&env, llh);
1340 rc = llog_cleanup(&env, ctxt);
1342 CERROR("can't cleanup llog: %d\n", rc);
1344 LASSERTF(atomic_read(&d->opd_sync_rpcs_in_progress) == 0,
1345 "%s: %d %d %sempty\n", d->opd_obd->obd_name,
1346 atomic_read(&d->opd_sync_rpcs_in_progress),
1347 atomic_read(&d->opd_sync_rpcs_in_flight),
1348 list_empty(&d->opd_sync_committed_there) ? "" : "!");
1350 thread->t_flags = SVC_STOPPED;
1352 wake_up(&thread->t_ctl_waitq);
1362 * Initializes the llog. Specific llog to be used depends on the type of the
1363 * target OSP represents (OST or MDT). The function adds appends a new llog
1364 * record to mark the place where the records associated with this boot
1367 * \param[in] env LU environment provided by the caller
1368 * \param[in] d OSP device
1370 * \retval 0 on success
1371 * \retval negative negated errno on error
1373 static int osp_sync_llog_init(const struct lu_env *env, struct osp_device *d)
1375 struct osp_thread_info *osi = osp_env_info(env);
1376 struct lu_fid *fid = &osi->osi_fid;
1377 struct llog_handle *lgh = NULL;
1378 struct obd_device *obd = d->opd_obd;
1379 struct llog_ctxt *ctxt;
1387 * open llog corresponding to our OST
1389 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
1390 obd->obd_lvfs_ctxt.dt = d->opd_storage;
1392 lu_local_obj_fid(fid, LLOG_CATALOGS_OID);
1394 rc = llog_osd_get_cat_list(env, d->opd_storage, d->opd_index, 1,
1395 &osi->osi_cid, fid);
1397 if (rc != -EFAULT) {
1398 CERROR("%s: can't get id from catalogs: rc = %d\n",
1403 /* After sparse OST indices is supported, the CATALOG file
1404 * may become a sparse file that results in failure on
1405 * reading. Skip this error as the llog will be created
1407 memset(&osi->osi_cid, 0, sizeof(osi->osi_cid));
1411 CDEBUG(D_INFO, "%s: Init llog for %d - catid "DFID":%x\n",
1412 obd->obd_name, d->opd_index,
1413 PFID(&osi->osi_cid.lci_logid.lgl_oi.oi_fid),
1414 osi->osi_cid.lci_logid.lgl_ogen);
1416 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT,
1417 d->opd_storage->dd_lu_dev.ld_obd,
1418 &llog_common_cat_ops);
1422 ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1425 if (likely(logid_id(&osi->osi_cid.lci_logid) != 0)) {
1426 struct lu_fid fid_temp;
1428 if (CFS_FAIL_CHECK(OBD_FAIL_OSP_INVALID_LOGID)) {
1429 memset(&osi->osi_cid, 0, sizeof(osi->osi_cid));
1430 logid_set_id(&osi->osi_cid.lci_logid, cfs_fail_val);
1433 logid_to_fid(&osi->osi_cid.lci_logid, &fid_temp);
1434 if (fid_is_sane(&fid_temp)) {
1435 rc = llog_open(env, ctxt, &lgh, &osi->osi_cid.lci_logid,
1436 NULL, LLOG_OPEN_EXISTS);
1438 /* re-create llog if it is missing */
1440 logid_set_id(&osi->osi_cid.lci_logid, 0);
1442 GOTO(out_cleanup, rc);
1444 CERROR("%s: the catid "DFID" for init llog %d is bad\n",
1445 obd->obd_name, PFID(&fid_temp), d->opd_index);
1447 /* it will be recreated later */
1448 logid_set_id(&osi->osi_cid.lci_logid, 0);
1452 if (unlikely(logid_id(&osi->osi_cid.lci_logid) == 0)) {
1453 rc = llog_open_create(env, ctxt, &lgh, NULL, NULL);
1455 GOTO(out_cleanup, rc);
1456 osi->osi_cid.lci_logid = lgh->lgh_id;
1459 LASSERT(lgh != NULL);
1460 ctxt->loc_handle = lgh;
1462 rc = llog_init_handle(env, lgh, LLOG_F_IS_CAT, NULL);
1464 GOTO(out_close, rc);
1466 rc = llog_osd_put_cat_list(env, d->opd_storage, d->opd_index, 1,
1467 &osi->osi_cid, fid);
1469 GOTO(out_close, rc);
1472 * put a mark in the llog till which we'll be processing
1473 * old records restless
1475 d->opd_sync_generation.mnt_cnt = ktime_get_ns();
1476 d->opd_sync_generation.conn_cnt = ktime_get_ns();
1478 osi->osi_hdr.lrh_type = LLOG_GEN_REC;
1479 osi->osi_hdr.lrh_len = sizeof(osi->osi_gen);
1481 memcpy(&osi->osi_gen.lgr_gen, &d->opd_sync_generation,
1482 sizeof(osi->osi_gen.lgr_gen));
1484 rc = llog_cat_add(env, lgh, &osi->osi_gen.lgr_hdr, &osi->osi_cookie);
1486 GOTO(out_close, rc);
1487 llog_ctxt_put(ctxt);
1490 llog_cat_close(env, lgh);
1492 llog_cleanup(env, ctxt);
1497 * Cleanup llog used for syncing.
1499 * Closes and cleanups the llog. The function is called when the device is
1502 * \param[in] env LU environment provided by the caller
1503 * \param[in] d OSP device
1505 static void osp_sync_llog_fini(const struct lu_env *env, struct osp_device *d)
1507 struct llog_ctxt *ctxt;
1509 ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
1511 llog_cat_close(env, ctxt->loc_handle);
1512 llog_cleanup(env, ctxt);
1517 * Initialization of the sync component of OSP.
1519 * Initializes the llog and starts a new thread to handle the changes to
1520 * the remote target (OST or MDT).
1522 * \param[in] env LU environment provided by the caller
1523 * \param[in] d OSP device
1525 * \retval 0 on success
1526 * \retval negative negated errno on error
1528 int osp_sync_init(const struct lu_env *env, struct osp_device *d)
1530 struct task_struct *task;
1535 d->opd_sync_max_rpcs_in_flight = OSP_MAX_RPCS_IN_FLIGHT;
1536 d->opd_sync_max_rpcs_in_progress = OSP_MAX_RPCS_IN_PROGRESS;
1537 spin_lock_init(&d->opd_sync_lock);
1538 init_waitqueue_head(&d->opd_sync_waitq);
1539 init_waitqueue_head(&d->opd_sync_barrier_waitq);
1540 thread_set_flags(&d->opd_sync_thread, SVC_INIT);
1541 init_waitqueue_head(&d->opd_sync_thread.t_ctl_waitq);
1542 INIT_LIST_HEAD(&d->opd_sync_in_flight_list);
1543 INIT_LIST_HEAD(&d->opd_sync_committed_there);
1545 if (d->opd_storage->dd_rdonly)
1549 * initialize llog storing changes
1551 rc = osp_sync_llog_init(env, d);
1553 CERROR("%s: can't initialize llog: rc = %d\n",
1554 d->opd_obd->obd_name, rc);
1559 * Start synchronization thread
1561 task = kthread_run(osp_sync_thread, d, "osp-syn-%u-%u",
1562 d->opd_index, d->opd_group);
1565 CERROR("%s: cannot start sync thread: rc = %d\n",
1566 d->opd_obd->obd_name, rc);
1570 wait_event_idle(d->opd_sync_thread.t_ctl_waitq,
1571 osp_sync_running(d) || osp_sync_stopped(d));
1575 osp_sync_llog_fini(env, d);
1581 * Stop the syncing thread.
1583 * Asks the syncing thread to stop and wait until it's stopped.
1585 * \param[in] d OSP device
1589 int osp_sync_fini(struct osp_device *d)
1591 struct ptlrpc_thread *thread = &d->opd_sync_thread;
1595 if (!thread_is_init(thread) && !thread_is_stopped(thread)) {
1596 thread->t_flags = SVC_STOPPING;
1597 wake_up(&d->opd_sync_waitq);
1598 wait_event(thread->t_ctl_waitq, thread_is_stopped(thread));
1604 struct osp_last_committed_cb {
1605 struct dt_txn_commit_cb ospc_cb;
1606 struct osp_device *ospc_dev;
1610 void osp_sync_local_commit_cb(struct lu_env *env, struct thandle *th,
1611 struct dt_txn_commit_cb *dcb, int err)
1613 struct osp_last_committed_cb *cb;
1614 struct osp_device *d;
1616 cb = container_of0(dcb, struct osp_last_committed_cb, ospc_cb);
1619 CDEBUG(D_HA, "%s: %llu committed\n", d->opd_obd->obd_name,
1622 spin_lock(&d->opd_sync_lock);
1623 if (cb->ospc_transno > d->opd_sync_last_committed_id)
1624 d->opd_sync_last_committed_id = cb->ospc_transno;
1625 spin_unlock(&d->opd_sync_lock);
1627 osp_sync_check_for_work(d);
1628 lu_device_put(osp2lu_dev(d));
1629 if (atomic_dec_and_test(&d->opd_commits_registered))
1630 wake_up(&d->opd_sync_waitq);
1635 static int osp_sync_add_commit_cb(const struct lu_env *env,
1636 struct osp_device *d, struct thandle *th)
1638 struct osp_last_committed_cb *cb;
1639 struct dt_txn_commit_cb *dcb;
1647 dcb->dcb_func = osp_sync_local_commit_cb;
1648 spin_lock(&d->opd_sync_lock);
1649 cb->ospc_transno = ++d->opd_sync_last_used_id;
1650 spin_unlock(&d->opd_sync_lock);
1652 rc = dt_trans_cb_add(th, dcb);
1653 CDEBUG(D_HA, "%s: add commit cb at %lluns, next at %lluns, rc = %d\n",
1654 d->opd_obd->obd_name, ktime_get_ns(),
1655 ktime_to_ns(d->opd_sync_next_commit_cb), rc);
1657 if (likely(rc == 0)) {
1658 lu_device_get(osp2lu_dev(d));
1659 atomic_inc(&d->opd_commits_registered);
1666 /* add the commit callback every second */
1667 int osp_sync_add_commit_cb_1s(const struct lu_env *env, struct osp_device *d,
1670 ktime_t now = ktime_get();
1674 if (ktime_before(now, d->opd_sync_next_commit_cb))
1677 spin_lock(&d->opd_sync_lock);
1678 if (ktime_before(d->opd_sync_next_commit_cb, now)) {
1680 d->opd_sync_next_commit_cb = ktime_add_ns(now, NSEC_PER_SEC);
1682 spin_unlock(&d->opd_sync_lock);
1687 return osp_sync_add_commit_cb(env, d, th);
1691 * generate an empty transaction and hook the commit callback in
1692 * then force transaction commit
1694 void osp_sync_force(const struct lu_env *env, struct osp_device *d)
1699 th = dt_trans_create(env, d->opd_storage);
1701 CERROR("%s: can't sync\n", d->opd_obd->obd_name);
1704 rc = dt_trans_start_local(env, d->opd_storage, th);
1706 CDEBUG(D_OTHER, "%s: sync forced, %d changes\n",
1707 d->opd_obd->obd_name,
1708 atomic_read(&d->opd_sync_changes));
1709 rc = osp_sync_add_commit_cb(env, d, th);
1710 dt_trans_stop(env, d->opd_storage, th);
1713 dt_commit_async(env, d->opd_storage);