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 <lustre_log.h>
44 #include <lustre_update.h>
45 #include "osp_internal.h"
48 * this is a components of OSP implementing synchronization between MDS and OST
49 * it llogs all interesting changes (currently it's uig/gid change and object
50 * destroy) atomically, then makes sure changes hit OST storage
52 * we have 4 queues of work:
54 * the first queue is llog itself, once read a change is stored in 2nd queue
55 * in form of RPC (but RPC isn't fired yet).
57 * the second queue (opd_sync_waiting_for_commit) holds changes awaiting local
58 * commit. once change is committed locally it migrates onto 3rd queue.
60 * the third queue (opd_sync_committed_here) holds changes committed locally,
61 * but not sent to OST (as the pipe can be full). once pipe becomes non-full
62 * we take a change from the queue and fire corresponded RPC.
64 * once RPC is reported committed by OST (using regular last_committed mech.)
65 * the change jumps into 4th queue (opd_sync_committed_there), now we can
66 * cancel corresponded llog record and release RPC
68 * opd_sync_changes is a number of unread llog records (to be processed).
69 * notice this number doesn't include llog records from previous boots.
70 * with OSP_SYNC_THRESHOLD we try to batch processing a bit (TO BE IMPLEMENTED)
72 * opd_sync_rpcs_in_progress is total number of requests in above 2-4 queues.
73 * we control this with OSP_MAX_RPCS_IN_PROGRESS so that OSP don't consume
74 * too much memory -- how to deal with 1000th OSTs ? batching could help?
76 * opd_sync_rpcs_in_flight is a number of RPC in flight.
77 * we control this with OSP_MAX_RPCS_IN_FLIGHT
80 /* XXX: do math to learn reasonable threshold
81 * should it be ~ number of changes fitting bulk? */
83 #define OSP_SYNC_THRESHOLD 10
84 #define OSP_MAX_RPCS_IN_FLIGHT 8
85 #define OSP_MAX_RPCS_IN_PROGRESS 4096
87 #define OSP_JOB_MAGIC 0x26112005
89 struct osp_job_req_args {
90 /** bytes reserved for ptlrpc_replay_req() */
91 struct ptlrpc_replay_async_args jra_raa;
92 struct list_head jra_committed_link;
93 struct list_head jra_in_flight_link;
94 struct llog_cookie jra_lcookie;
98 static int osp_sync_add_commit_cb(const struct lu_env *env,
99 struct osp_device *d, struct thandle *th);
101 static inline int osp_sync_running(struct osp_device *d)
103 return !!(d->opd_sync_thread.t_flags & SVC_RUNNING);
107 * Check status: whether OSP thread has stopped
109 * \param[in] d OSP device
111 * \retval 0 still running
114 static inline int osp_sync_stopped(struct osp_device *d)
116 return !!(d->opd_sync_thread.t_flags & SVC_STOPPED);
120 ** Check for new changes to sync
122 * \param[in] d OSP device
124 * \retval 1 there are changes
125 * \retval 0 there are no changes
127 static inline int osp_sync_has_new_job(struct osp_device *d)
129 return atomic_read(&d->opd_sync_changes) > 0 ||
130 d->opd_sync_prev_done == 0;
133 static inline int osp_sync_in_flight_conflict(struct osp_device *d,
134 struct llog_rec_hdr *h)
136 struct osp_job_req_args *jra;
140 if (h == NULL || h->lrh_type == LLOG_GEN_REC ||
141 list_empty(&d->opd_sync_in_flight_list))
144 memset(&ostid, 0, sizeof(ostid));
145 switch (h->lrh_type) {
146 case MDS_UNLINK_REC: {
147 struct llog_unlink_rec *unlink = (struct llog_unlink_rec *)h;
149 ostid_set_seq(&ostid, unlink->lur_oseq);
150 if (ostid_set_id(&ostid, unlink->lur_oid)) {
151 CERROR("Bad %llu to set " DOSTID "\n",
152 (unsigned long long)(unlink->lur_oid),
158 case MDS_UNLINK64_REC:
159 fid_to_ostid(&((struct llog_unlink64_rec *)h)->lur_fid, &ostid);
161 case MDS_SETATTR64_REC:
162 ostid = ((struct llog_setattr64_rec *)h)->lsr_oi;
168 spin_lock(&d->opd_sync_lock);
169 list_for_each_entry(jra, &d->opd_sync_in_flight_list,
170 jra_in_flight_link) {
171 struct ptlrpc_request *req;
172 struct ost_body *body;
174 LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
176 req = container_of((void *)jra, struct ptlrpc_request,
178 body = req_capsule_client_get(&req->rq_pill,
182 if (memcmp(&ostid, &body->oa.o_oi, sizeof(ostid)) == 0) {
187 spin_unlock(&d->opd_sync_lock);
192 static inline int osp_sync_rpcs_in_progress_low(struct osp_device *d)
194 return atomic_read(&d->opd_sync_rpcs_in_progress) <
195 d->opd_sync_max_rpcs_in_progress;
199 * Check for room in the network pipe to OST
201 * \param[in] d OSP device
203 * \retval 1 there is room
204 * \retval 0 no room, the pipe is full
206 static inline int osp_sync_rpcs_in_flight_low(struct osp_device *d)
208 return atomic_read(&d->opd_sync_rpcs_in_flight) <
209 d->opd_sync_max_rpcs_in_flight;
213 * Wake up check for the main sync thread
215 * \param[in] d OSP device
217 * \retval 1 time to wake up
218 * \retval 0 no need to wake up
220 static inline int osp_sync_has_work(struct osp_device *osp)
222 /* has new/old changes and low in-progress? */
223 if (osp_sync_has_new_job(osp) && osp_sync_rpcs_in_progress_low(osp) &&
224 osp_sync_rpcs_in_flight_low(osp) && osp->opd_imp_connected)
227 /* has remotely committed? */
228 if (!list_empty(&osp->opd_sync_committed_there))
234 void osp_sync_check_for_work(struct osp_device *osp)
236 if (osp_sync_has_work(osp))
237 wake_up(&osp->opd_sync_waitq);
240 static inline __u64 osp_sync_correct_id(struct osp_device *d,
241 struct llog_rec_hdr *rec)
244 * llog use cyclic store with 32 bit lrh_id
245 * so overflow lrh_id is possible. Range between
246 * last_processed and last_committed is less than
247 * 64745 ^ 2 and less than 2^32 - 1
249 __u64 correct_id = d->opd_sync_last_committed_id;
251 if ((correct_id & 0xffffffffULL) < rec->lrh_id)
252 correct_id -= 0x100000000ULL;
254 correct_id &= ~0xffffffffULL;
255 correct_id |= rec->lrh_id;
261 * Check and return ready-for-new status.
263 * The thread processing llog record uses this function to check whether
264 * it's time to take another record and process it. The number of conditions
265 * must be met: the connection should be ready, RPCs in flight not exceeding
266 * the limit, the record is committed locally, etc (see the lines below).
268 * \param[in] d OSP device
269 * \param[in] rec next llog record to process
271 * \retval 0 not ready
274 static inline int osp_sync_can_process_new(struct osp_device *d,
275 struct llog_rec_hdr *rec)
279 if (unlikely(atomic_read(&d->opd_sync_barrier) > 0))
281 if (unlikely(osp_sync_in_flight_conflict(d, rec)))
283 if (!osp_sync_rpcs_in_progress_low(d))
285 if (!osp_sync_rpcs_in_flight_low(d))
287 if (!d->opd_imp_connected)
289 if (d->opd_sync_prev_done == 0)
291 if (atomic_read(&d->opd_sync_changes) == 0)
295 /* notice "<" not "<=" */
296 if (osp_sync_correct_id(d, rec) < d->opd_sync_last_committed_id)
302 * Declare intention to add a new change.
304 * With regard to OSD API, we have to declare any changes ahead. In this
305 * case we declare an intention to add a llog record representing the
306 * change on the local storage.
308 * \param[in] env LU environment provided by the caller
309 * \param[in] o OSP object
310 * \param[in] type type of change: MDS_UNLINK64_REC or MDS_SETATTR64_REC
311 * \param[in] th transaction handle (local)
313 * \retval 0 on success
314 * \retval negative negated errno on error
316 int osp_sync_declare_add(const struct lu_env *env, struct osp_object *o,
317 enum llog_op_type type, struct thandle *th)
319 struct osp_thread_info *osi = osp_env_info(env);
320 struct osp_device *d = lu2osp_dev(o->opo_obj.do_lu.lo_dev);
321 struct llog_ctxt *ctxt;
322 struct thandle *storage_th;
327 /* it's a layering violation, to access internals of th,
328 * but we can do this as a sanity check, for a while */
329 LASSERT(th->th_top != NULL);
330 storage_th = thandle_get_sub_by_dt(env, th->th_top, d->opd_storage);
331 if (IS_ERR(storage_th))
332 RETURN(PTR_ERR(storage_th));
335 case MDS_UNLINK64_REC:
336 osi->osi_hdr.lrh_len = sizeof(struct llog_unlink64_rec);
338 case MDS_SETATTR64_REC:
339 osi->osi_hdr.lrh_len = sizeof(struct llog_setattr64_rec_v2);
345 ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
348 rc = llog_declare_add(env, ctxt->loc_handle, &osi->osi_hdr,
356 * Generate a llog record for a given change.
358 * Generates a llog record for the change passed. The change can be of two
359 * types: unlink and setattr. The record gets an ID which later will be
360 * used to track commit status of the change. For unlink changes, the caller
361 * can supply a starting FID and the count of the objects to destroy. For
362 * setattr the caller should apply attributes to apply.
365 * \param[in] env LU environment provided by the caller
366 * \param[in] d OSP device
367 * \param[in] fid fid of the object the change should be applied to
368 * \param[in] type type of change: MDS_UNLINK64_REC or MDS_SETATTR64_REC
369 * \param[in] count count of objects to destroy
370 * \param[in] th transaction handle (local)
371 * \param[in] attr attributes for setattr
373 * \retval 0 on success
374 * \retval negative negated errno on error
376 static int osp_sync_add_rec(const struct lu_env *env, struct osp_device *d,
377 const struct lu_fid *fid, enum llog_op_type type,
378 int count, struct thandle *th,
379 const struct lu_attr *attr)
381 struct osp_thread_info *osi = osp_env_info(env);
382 struct llog_ctxt *ctxt;
383 struct thandle *storage_th;
384 bool immediate_commit_cb = false;
389 /* it's a layering violation, to access internals of th,
390 * but we can do this as a sanity check, for a while */
391 LASSERT(th->th_top != NULL);
392 storage_th = thandle_get_sub_by_dt(env, th->th_top, d->opd_storage);
393 if (IS_ERR(storage_th))
394 RETURN(PTR_ERR(storage_th));
397 case MDS_UNLINK64_REC:
398 osi->osi_hdr.lrh_len = sizeof(osi->osi_unlink);
399 osi->osi_hdr.lrh_type = MDS_UNLINK64_REC;
400 osi->osi_unlink.lur_fid = *fid;
401 osi->osi_unlink.lur_count = count;
403 case MDS_SETATTR64_REC:
404 rc = fid_to_ostid(fid, &osi->osi_oi);
406 osi->osi_hdr.lrh_len = sizeof(osi->osi_setattr);
407 osi->osi_hdr.lrh_type = MDS_SETATTR64_REC;
408 osi->osi_setattr.lsr_oi = osi->osi_oi;
410 osi->osi_setattr.lsr_uid = attr->la_uid;
411 osi->osi_setattr.lsr_gid = attr->la_gid;
412 osi->osi_setattr.lsr_layout_version = attr->la_layout_version;
413 osi->osi_setattr.lsr_projid = attr->la_projid;
414 osi->osi_setattr.lsr_valid =
415 ((attr->la_valid & LA_UID) ? OBD_MD_FLUID : 0) |
416 ((attr->la_valid & LA_GID) ? OBD_MD_FLGID : 0) |
417 ((attr->la_valid & LA_PROJID) ? OBD_MD_FLPROJID : 0);
418 if (attr->la_valid & LA_LAYOUT_VERSION) {
419 osi->osi_setattr.lsr_valid |= OBD_MD_LAYOUT_VERSION;
421 /* FLR: the layout version has to be transferred to
422 * OST objects ASAP, otherwise clients will have to
423 * experience delay to be able to write OST objects. */
424 immediate_commit_cb = true;
431 /* we keep the same id, but increment it when the callback
432 * is registered, so that all records upto the one taken
433 * by the callback are subject to processing */
434 spin_lock(&d->opd_sync_lock);
435 osi->osi_hdr.lrh_id = d->opd_sync_last_used_id;
436 spin_unlock(&d->opd_sync_lock);
438 ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
442 rc = llog_add(env, ctxt->loc_handle, &osi->osi_hdr, &osi->osi_cookie,
446 if (likely(rc >= 0)) {
447 CDEBUG(D_OTHER, "%s: new record "DFID":%x.%u: rc = %d\n",
448 d->opd_obd->obd_name,
449 PFID(&osi->osi_cookie.lgc_lgl.lgl_oi.oi_fid),
450 osi->osi_cookie.lgc_lgl.lgl_ogen,
451 osi->osi_cookie.lgc_index, rc);
452 atomic_inc(&d->opd_sync_changes);
455 if (immediate_commit_cb)
456 rc = osp_sync_add_commit_cb(env, d, th);
458 rc = osp_sync_add_commit_cb_1s(env, d, th);
460 /* return 0 always here, error case just cause no llog record */
464 int osp_sync_add(const struct lu_env *env, struct osp_object *o,
465 enum llog_op_type type, struct thandle *th,
466 const struct lu_attr *attr)
468 return osp_sync_add_rec(env, lu2osp_dev(o->opo_obj.do_lu.lo_dev),
469 lu_object_fid(&o->opo_obj.do_lu), type, 1,
473 int osp_sync_gap(const struct lu_env *env, struct osp_device *d,
474 struct lu_fid *fid, int lost, struct thandle *th)
476 return osp_sync_add_rec(env, d, fid, MDS_UNLINK64_REC, lost, th, NULL);
480 * it's quite obvious we can't maintain all the structures in the memory:
481 * while OST is down, MDS can be processing thousands and thousands of unlinks
482 * filling persistent llogs and in-core respresentation
484 * this doesn't scale at all. so we need basically the following:
485 * a) destroy/setattr append llog records
486 * b) once llog has grown to X records, we process first Y committed records
488 * once record R is found via llog_process(), it becomes committed after any
489 * subsequent commit callback (at the most)
493 * ptlrpc commit callback.
495 * The callback is called by PTLRPC when a RPC is reported committed by the
496 * target (OST). We register the callback for the every RPC applying a change
497 * from the llog. This way we know then the llog records can be cancelled.
498 * Notice the callback can be called when OSP is finishing. We can detect this
499 * checking that actual transno in the request is less or equal of known
500 * committed transno (see osp_sync_process_committed() for the details).
501 * XXX: this is pretty expensive and can be improved later using batching.
503 * \param[in] req request
505 static void osp_sync_request_commit_cb(struct ptlrpc_request *req)
507 struct osp_device *d = req->rq_cb_data;
508 struct osp_job_req_args *jra;
510 CDEBUG(D_HA, "commit req %p, transno %llu\n", req, req->rq_transno);
512 if (unlikely(req->rq_transno == 0))
515 /* do not do any opd_sync_rpcs_* accounting here
516 * it's done in osp_sync_interpret sooner or later */
519 jra = ptlrpc_req_async_args(req);
520 LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
521 LASSERT(list_empty(&jra->jra_committed_link));
523 ptlrpc_request_addref(req);
525 spin_lock(&d->opd_sync_lock);
526 list_add(&jra->jra_committed_link, &d->opd_sync_committed_there);
527 spin_unlock(&d->opd_sync_lock);
529 /* XXX: some batching wouldn't hurt */
530 wake_up(&d->opd_sync_waitq);
534 * RPC interpretation callback.
536 * The callback is called by ptlrpc when RPC is replied. Now we have to decide
538 * - put request on a special list to wait until it's committed by the target,
539 * if the request is successful
540 * - schedule llog record cancel if no target object is found
541 * - try later (essentially after reboot) in case of unexpected error
543 * \param[in] env LU environment provided by the caller
544 * \param[in] req request replied
545 * \param[in] aa callback data
546 * \param[in] rc result of RPC
550 static int osp_sync_interpret(const struct lu_env *env,
551 struct ptlrpc_request *req, void *args, int rc)
553 struct osp_job_req_args *jra = args;
554 struct osp_device *d = req->rq_cb_data;
556 if (jra->jra_magic != OSP_JOB_MAGIC) {
557 DEBUG_REQ(D_ERROR, req, "bad magic %u\n", jra->jra_magic);
562 CDEBUG(D_HA, "reply req %p/%d, rc %d, transno %u\n", req,
563 atomic_read(&req->rq_refcount),
564 rc, (unsigned) req->rq_transno);
568 * we tried to destroy object or update attributes,
569 * but object doesn't exist anymore - cancell llog record
571 LASSERT(req->rq_transno == 0);
572 LASSERT(list_empty(&jra->jra_committed_link));
574 ptlrpc_request_addref(req);
576 spin_lock(&d->opd_sync_lock);
577 list_add(&jra->jra_committed_link,
578 &d->opd_sync_committed_there);
579 spin_unlock(&d->opd_sync_lock);
581 wake_up(&d->opd_sync_waitq);
583 struct obd_import *imp = req->rq_import;
585 * error happened, we'll try to repeat on next boot ?
587 LASSERTF(req->rq_transno == 0 || rc == -EIO ||
588 req->rq_import_generation < imp->imp_generation,
589 "transno %llu, rc %d, gen: req %d, imp %d\n",
590 req->rq_transno, rc, req->rq_import_generation,
591 imp->imp_generation);
592 if (req->rq_transno == 0) {
593 /* this is the last time we see the request
594 * if transno is not zero, then commit cb
595 * will be called at some point */
596 LASSERT(atomic_read(&d->opd_sync_rpcs_in_progress) > 0);
597 atomic_dec(&d->opd_sync_rpcs_in_progress);
600 wake_up(&d->opd_sync_waitq);
601 } else if (d->opd_pre != NULL &&
602 unlikely(d->opd_pre_status == -ENOSPC)) {
604 * if current status is -ENOSPC (lack of free space on OST)
605 * then we should poll OST immediately once object destroy
608 osp_statfs_need_now(d);
611 spin_lock(&d->opd_sync_lock);
612 list_del_init(&jra->jra_in_flight_link);
613 spin_unlock(&d->opd_sync_lock);
614 LASSERT(atomic_read(&d->opd_sync_rpcs_in_flight) > 0);
615 atomic_dec(&d->opd_sync_rpcs_in_flight);
616 if (unlikely(atomic_read(&d->opd_sync_barrier) > 0))
617 wake_up(&d->opd_sync_barrier_waitq);
618 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
619 d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight),
620 atomic_read(&d->opd_sync_rpcs_in_progress));
622 osp_sync_check_for_work(d);
628 ** Add request to ptlrpc queue.
630 * This is just a tiny helper function to put the request on the sending list
632 * \param[in] d OSP device
633 * \param[in] llh llog handle where the record is stored
634 * \param[in] h llog record
635 * \param[in] req request
637 static void osp_sync_send_new_rpc(struct osp_device *d,
638 struct llog_handle *llh,
639 struct llog_rec_hdr *h,
640 struct ptlrpc_request *req)
642 struct osp_job_req_args *jra;
644 LASSERT(atomic_read(&d->opd_sync_rpcs_in_flight) <=
645 d->opd_sync_max_rpcs_in_flight);
647 jra = ptlrpc_req_async_args(req);
648 jra->jra_magic = OSP_JOB_MAGIC;
649 jra->jra_lcookie.lgc_lgl = llh->lgh_id;
650 jra->jra_lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
651 jra->jra_lcookie.lgc_index = h->lrh_index;
652 INIT_LIST_HEAD(&jra->jra_committed_link);
653 spin_lock(&d->opd_sync_lock);
654 list_add_tail(&jra->jra_in_flight_link, &d->opd_sync_in_flight_list);
655 spin_unlock(&d->opd_sync_lock);
657 ptlrpcd_add_req(req);
662 * Allocate and prepare RPC for a new change.
664 * The function allocates and initializes an RPC which will be sent soon to
665 * apply the change to the target OST. The request is initialized from the
666 * llog record passed. Notice only the fields common to all type of changes
669 * \param[in] d OSP device
670 * \param[in] op type of the change
671 * \param[in] format request format to be used
673 * \retval pointer new request on success
674 * \retval ERR_PTR(errno) on error
676 static struct ptlrpc_request *osp_sync_new_job(struct osp_device *d,
678 const struct req_format *format)
680 struct ptlrpc_request *req;
681 struct obd_import *imp;
684 /* Prepare the request */
685 imp = d->opd_obd->u.cli.cl_import;
688 if (OBD_FAIL_CHECK(OBD_FAIL_OSP_CHECK_ENOMEM))
689 RETURN(ERR_PTR(-ENOMEM));
691 req = ptlrpc_request_alloc(imp, format);
693 RETURN(ERR_PTR(-ENOMEM));
695 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, op);
697 ptlrpc_req_finished(req);
701 req->rq_interpret_reply = osp_sync_interpret;
702 req->rq_commit_cb = osp_sync_request_commit_cb;
705 ptlrpc_request_set_replen(req);
711 * Generate a request for setattr change.
713 * The function prepares a new RPC, initializes it with setattr specific
714 * bits and send the RPC.
716 * \param[in] d OSP device
717 * \param[in] llh llog handle where the record is stored
718 * \param[in] h llog record
720 * \retval 0 on success
721 * \retval 1 on invalid record
722 * \retval negative negated errno on error
724 static int osp_sync_new_setattr_job(struct osp_device *d,
725 struct llog_handle *llh,
726 struct llog_rec_hdr *h)
728 struct llog_setattr64_rec *rec = (struct llog_setattr64_rec *)h;
729 struct ptlrpc_request *req;
730 struct ost_body *body;
733 LASSERT(h->lrh_type == MDS_SETATTR64_REC);
735 if (OBD_FAIL_CHECK(OBD_FAIL_OSP_CHECK_INVALID_REC))
738 /* lsr_valid can only be 0 or HAVE OBD_MD_{FLUID, FLGID, FLPROJID} set,
739 * so no bits other than these should be set. */
740 if ((rec->lsr_valid & ~(OBD_MD_FLUID | OBD_MD_FLGID |
741 OBD_MD_FLPROJID | OBD_MD_LAYOUT_VERSION)) != 0) {
742 CERROR("%s: invalid setattr record, lsr_valid:%llu\n",
743 d->opd_obd->obd_name, rec->lsr_valid);
744 /* return 1 on invalid record */
748 req = osp_sync_new_job(d, OST_SETATTR, &RQF_OST_SETATTR);
750 RETURN(PTR_ERR(req));
752 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
754 body->oa.o_oi = rec->lsr_oi;
755 body->oa.o_uid = rec->lsr_uid;
756 body->oa.o_gid = rec->lsr_gid;
757 body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
758 if (h->lrh_len > sizeof(struct llog_setattr64_rec)) {
759 struct llog_setattr64_rec_v2 *rec_v2 = (typeof(rec_v2))rec;
760 body->oa.o_projid = rec_v2->lsr_projid;
761 body->oa.o_layout_version = rec_v2->lsr_layout_version;
764 /* old setattr record (prior 2.6.0) doesn't have 'valid' stored,
765 * we assume that both UID and GID are valid in that case. */
766 if (rec->lsr_valid == 0)
767 body->oa.o_valid |= (OBD_MD_FLUID | OBD_MD_FLGID);
769 body->oa.o_valid |= rec->lsr_valid;
771 if (body->oa.o_valid & OBD_MD_LAYOUT_VERSION) {
772 OBD_FAIL_TIMEOUT(OBD_FAIL_FLR_LV_DELAY, cfs_fail_val);
773 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_FLR_LV_INC)))
774 ++body->oa.o_layout_version;
777 osp_sync_send_new_rpc(d, llh, h, req);
782 * Generate a request for unlink change.
784 * The function prepares a new RPC, initializes it with unlink(destroy)
785 * specific bits and sends the RPC. The function is used to handle
786 * llog_unlink_rec which were used in the older versions of Lustre.
787 * Current version uses llog_unlink_rec64.
789 * \param[in] d OSP device
790 * \param[in] llh llog handle where the record is stored
791 * \param[in] h llog record
793 * \retval 0 on success
794 * \retval negative negated errno on error
796 static int osp_sync_new_unlink_job(struct osp_device *d,
797 struct llog_handle *llh,
798 struct llog_rec_hdr *h)
800 struct llog_unlink_rec *rec = (struct llog_unlink_rec *)h;
801 struct ptlrpc_request *req;
802 struct ost_body *body;
806 LASSERT(h->lrh_type == MDS_UNLINK_REC);
808 req = osp_sync_new_job(d, OST_DESTROY, &RQF_OST_DESTROY);
810 RETURN(PTR_ERR(req));
812 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
814 ostid_set_seq(&body->oa.o_oi, rec->lur_oseq);
815 rc = ostid_set_id(&body->oa.o_oi, rec->lur_oid);
818 body->oa.o_misc = rec->lur_count;
819 body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
821 body->oa.o_valid |= OBD_MD_FLOBJCOUNT;
823 osp_sync_send_new_rpc(d, llh, h, req);
828 * Generate a request for unlink change.
830 * The function prepares a new RPC, initializes it with unlink(destroy)
831 * specific bits and sends the RPC. Depending on the target (MDT or OST)
832 * two different protocols are used. For MDT we use OUT (basically OSD API
833 * updates transferred via a network). For OST we still use the old
834 * protocol (OBD?), originally for compatibility. Later we can start to
835 * use OUT for OST as well, this will allow batching and better code
838 * \param[in] d OSP device
839 * \param[in] llh llog handle where the record is stored
840 * \param[in] h llog record
842 * \retval 0 on success
843 * \retval negative negated errno on error
845 static int osp_sync_new_unlink64_job(struct osp_device *d,
846 struct llog_handle *llh,
847 struct llog_rec_hdr *h)
849 struct llog_unlink64_rec *rec = (struct llog_unlink64_rec *)h;
850 struct ptlrpc_request *req = NULL;
851 struct ost_body *body;
855 LASSERT(h->lrh_type == MDS_UNLINK64_REC);
856 req = osp_sync_new_job(d, OST_DESTROY, &RQF_OST_DESTROY);
858 RETURN(PTR_ERR(req));
860 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
863 rc = fid_to_ostid(&rec->lur_fid, &body->oa.o_oi);
866 body->oa.o_misc = rec->lur_count;
867 body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID |
869 osp_sync_send_new_rpc(d, llh, h, req);
874 * Process llog records.
876 * This function is called to process the llog records committed locally.
877 * In the recovery model used by OSP we can apply a change to a remote
878 * target once corresponding transaction (like posix unlink) is committed
879 * locally so can't revert.
880 * Depending on the llog record type, a given handler is called that is
881 * responsible for preparing and sending the RPC to apply the change.
882 * Special record type LLOG_GEN_REC marking a reboot is cancelled right away.
884 * \param[in] env LU environment provided by the caller
885 * \param[in] d OSP device
886 * \param[in] llh llog handle where the record is stored
887 * \param[in] rec llog record
889 static void osp_sync_process_record(const struct lu_env *env,
890 struct osp_device *d,
891 struct llog_handle *llh,
892 struct llog_rec_hdr *rec)
894 struct llog_handle *cathandle = llh->u.phd.phd_cat_handle;
895 struct llog_cookie cookie;
900 cookie.lgc_lgl = llh->lgh_id;
901 cookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
902 cookie.lgc_index = rec->lrh_index;
904 d->opd_sync_last_catalog_idx = llh->lgh_hdr->llh_cat_idx;
906 if (unlikely(rec->lrh_type == LLOG_GEN_REC)) {
907 struct llog_gen_rec *gen = (struct llog_gen_rec *)rec;
909 /* we're waiting for the record generated by this instance */
910 LASSERT(d->opd_sync_prev_done == 0);
911 if (!memcmp(&d->opd_sync_generation, &gen->lgr_gen,
912 sizeof(gen->lgr_gen))) {
913 CDEBUG(D_HA, "processed all old entries\n");
914 d->opd_sync_prev_done = 1;
917 /* cancel any generation record */
918 rc = llog_cat_cancel_records(env, cathandle, 1, &cookie);
920 /* flush all pending records ASAP */
921 osp_sync_force(env, d);
927 * now we prepare and fill requests to OST, put them on the queue
928 * and fire after next commit callback
931 /* notice we increment counters before sending RPC, to be consistent
932 * in RPC interpret callback which may happen very quickly */
933 atomic_inc(&d->opd_sync_rpcs_in_flight);
934 atomic_inc(&d->opd_sync_rpcs_in_progress);
936 switch (rec->lrh_type) {
937 /* case MDS_UNLINK_REC is kept for compatibility */
939 rc = osp_sync_new_unlink_job(d, llh, rec);
941 case MDS_UNLINK64_REC:
942 rc = osp_sync_new_unlink64_job(d, llh, rec);
944 case MDS_SETATTR64_REC:
945 rc = osp_sync_new_setattr_job(d, llh, rec);
948 CERROR("%s: unknown record type: %x\n", d->opd_obd->obd_name,
950 /* treat "unknown record type" as "invalid" */
955 /* For all kinds of records, not matter successful or not,
956 * we should decrease changes and bump last_processed_id.
958 if (d->opd_sync_prev_done) {
959 LASSERT(atomic_read(&d->opd_sync_changes) > 0);
960 atomic_dec(&d->opd_sync_changes);
961 wake_up(&d->opd_sync_barrier_waitq);
963 atomic64_inc(&d->opd_sync_processed_recs);
965 atomic_dec(&d->opd_sync_rpcs_in_flight);
966 atomic_dec(&d->opd_sync_rpcs_in_progress);
969 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
970 d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight),
971 atomic_read(&d->opd_sync_rpcs_in_progress));
973 /* Delete the invalid record */
975 rc = llog_cat_cancel_records(env, cathandle, 1, &cookie);
977 CERROR("%s: can't delete invalid record: "
978 "fid = "DFID", rec_id = %u, rc = %d\n",
979 d->opd_obd->obd_name,
980 PFID(lu_object_fid(&cathandle->lgh_obj->do_lu)),
984 CDEBUG(D_HA, "found record %x, %d, idx %u, id %u\n",
985 rec->lrh_type, rec->lrh_len, rec->lrh_index, rec->lrh_id);
991 * Cancel llog records for the committed changes.
993 * The function walks through the list of the committed RPCs and cancels
994 * corresponding llog records. see osp_sync_request_commit_cb() for the
997 * \param[in] env LU environment provided by the caller
998 * \param[in] d OSP device
1000 static void osp_sync_process_committed(const struct lu_env *env,
1001 struct osp_device *d)
1003 struct obd_device *obd = d->opd_obd;
1004 struct obd_import *imp = obd->u.cli.cl_import;
1005 struct ost_body *body;
1006 struct ptlrpc_request *req;
1007 struct llog_ctxt *ctxt;
1008 struct llog_handle *llh;
1010 struct list_head list, *le;
1011 struct llog_logid lgid;
1012 int rc, i, count = 0, done = 0;
1016 if (list_empty(&d->opd_sync_committed_there))
1020 * if current status is -ENOSPC (lack of free space on OST)
1021 * then we should poll OST immediately once object destroy
1023 * notice: we do this upon commit as well because some backends
1024 * (like DMU) do not release space right away.
1026 if (d->opd_pre != NULL && unlikely(d->opd_pre_status == -ENOSPC))
1027 osp_statfs_need_now(d);
1030 * now cancel them all
1031 * XXX: can we improve this using some batching?
1032 * with batch RPC that'll happen automatically?
1033 * XXX: can we store ctxt in lod_device and save few cycles ?
1035 ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1038 llh = ctxt->loc_handle;
1041 INIT_LIST_HEAD(&list);
1042 spin_lock(&d->opd_sync_lock);
1043 list_splice(&d->opd_sync_committed_there, &list);
1044 INIT_LIST_HEAD(&d->opd_sync_committed_there);
1045 spin_unlock(&d->opd_sync_lock);
1047 list_for_each(le, &list)
1050 OBD_ALLOC_WAIT(arr, sizeof(int) * count);
1054 while (!list_empty(&list)) {
1055 struct osp_job_req_args *jra;
1057 jra = list_entry(list.next, struct osp_job_req_args,
1058 jra_committed_link);
1059 LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
1060 list_del_init(&jra->jra_committed_link);
1062 req = container_of((void *)jra, struct ptlrpc_request,
1064 body = req_capsule_client_get(&req->rq_pill,
1067 /* import can be closing, thus all commit cb's are
1068 * called we can check committness directly */
1069 if (req->rq_import_generation == imp->imp_generation) {
1071 !memcmp(&jra->jra_lcookie.lgc_lgl, &lgid,
1074 lgid = jra->jra_lcookie.lgc_lgl;
1076 arr[i++] = jra->jra_lcookie.lgc_index;
1078 rc = llog_cat_cancel_records(env, llh, 1,
1081 CERROR("%s: can't cancel record: %d\n",
1085 DEBUG_REQ(D_OTHER, req, "imp_committed = %llu",
1086 imp->imp_peer_committed_transno);
1088 ptlrpc_req_finished(req);
1092 rc = llog_cat_cancel_arr_rec(env, llh, &lgid, i, arr);
1095 CERROR("%s: can't cancel %d records rc: %d\n",
1096 obd->obd_name, i, rc);
1098 CDEBUG(D_OTHER, "%s: massive records cancel id "DFID\
1099 " num %d\n", obd->obd_name,
1100 PFID(&lgid.lgl_oi.oi_fid), i);
1103 OBD_FREE(arr, sizeof(int) * count);
1105 llog_ctxt_put(ctxt);
1107 LASSERT(atomic_read(&d->opd_sync_rpcs_in_progress) >= done);
1108 atomic_sub(done, &d->opd_sync_rpcs_in_progress);
1109 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress, done %d\n",
1110 d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight),
1111 atomic_read(&d->opd_sync_rpcs_in_progress), done);
1113 osp_sync_check_for_work(d);
1115 /* wake up the thread if requested to stop:
1116 * it might be waiting for in-progress to complete */
1117 if (unlikely(osp_sync_running(d) == 0))
1118 wake_up(&d->opd_sync_waitq);
1124 * The core of the syncing mechanism.
1126 * This is a callback called by the llog processing function. Essentially it
1127 * suspends llog processing until there is a record to process (it's supposed
1128 * to be committed locally). The function handles RPCs committed by the target
1129 * and cancels corresponding llog records.
1131 * \param[in] env LU environment provided by the caller
1132 * \param[in] llh llog handle we're processing
1133 * \param[in] rec current llog record
1134 * \param[in] data callback data containing a pointer to the device
1136 * \retval 0 to ask the caller (llog_process()) to continue
1137 * \retval LLOG_PROC_BREAK to ask the caller to break
1139 static int osp_sync_process_queues(const struct lu_env *env,
1140 struct llog_handle *llh,
1141 struct llog_rec_hdr *rec,
1144 struct osp_device *d = data;
1147 struct l_wait_info lwi = { 0 };
1149 if (!osp_sync_running(d)) {
1150 CDEBUG(D_HA, "stop llog processing\n");
1151 return LLOG_PROC_BREAK;
1154 /* process requests committed by OST */
1155 osp_sync_process_committed(env, d);
1157 /* if we there are changes to be processed and we have
1158 * resources for this ... do now */
1159 if (osp_sync_can_process_new(d, rec)) {
1161 /* ask llog for another record */
1162 CDEBUG(D_HA, "%u changes, %u in progress,"
1164 atomic_read(&d->opd_sync_changes),
1165 atomic_read(&d->opd_sync_rpcs_in_progress),
1166 atomic_read(&d->opd_sync_rpcs_in_flight));
1169 osp_sync_process_record(env, d, llh, rec);
1174 l_wait_event(d->opd_sync_waitq,
1175 !osp_sync_running(d) ||
1176 osp_sync_can_process_new(d, rec) ||
1177 !list_empty(&d->opd_sync_committed_there),
1185 * This thread runs llog_cat_process() scanner calling our callback
1186 * to process llog records. in the callback we implement tricky
1187 * state machine as we don't want to start scanning of the llog again
1188 * and again, also we don't want to process too many records and send
1189 * too many RPCs a time. so, depending on current load (num of changes
1190 * being synced to OST) the callback can suspend awaiting for some
1191 * new conditions, like syncs completed.
1193 * In order to process llog records left by previous boots and to allow
1194 * llog_process_thread() to find something (otherwise it'd just exit
1195 * immediately) we add a special GENERATATION record on each boot.
1197 * \param[in] _arg a pointer to thread's arguments
1199 * \retval 0 on success
1200 * \retval negative negated errno on error
1202 static int osp_sync_thread(void *_arg)
1204 struct osp_device *d = _arg;
1205 struct ptlrpc_thread *thread = &d->opd_sync_thread;
1206 struct l_wait_info lwi = { 0 };
1207 struct llog_ctxt *ctxt;
1208 struct obd_device *obd = d->opd_obd;
1209 struct llog_handle *llh;
1216 rc = lu_env_init(&env, LCT_LOCAL);
1218 CERROR("%s: can't initialize env: rc = %d\n",
1221 spin_lock(&d->opd_sync_lock);
1222 thread->t_flags = SVC_STOPPED;
1223 spin_unlock(&d->opd_sync_lock);
1224 wake_up(&thread->t_ctl_waitq);
1229 spin_lock(&d->opd_sync_lock);
1230 thread->t_flags = SVC_RUNNING;
1231 spin_unlock(&d->opd_sync_lock);
1232 wake_up(&thread->t_ctl_waitq);
1234 ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1236 CERROR("can't get appropriate context\n");
1237 GOTO(out, rc = -EINVAL);
1240 llh = ctxt->loc_handle;
1242 CERROR("can't get llh\n");
1243 llog_ctxt_put(ctxt);
1244 GOTO(out, rc = -EINVAL);
1248 * Catalog processing stops when it processed last catalog record
1249 * with index equal to the end of catalog bitmap. Or if it is wrapped,
1250 * processing stops with index equal to the lgh_last_idx. We need to
1251 * continue processing.
1253 d->opd_sync_last_catalog_idx = 0;
1257 wrapped = (llh->lgh_hdr->llh_cat_idx >= llh->lgh_last_idx &&
1258 llh->lgh_hdr->llh_count > 1);
1260 rc = llog_cat_process(&env, llh, osp_sync_process_queues, d,
1261 d->opd_sync_last_catalog_idx, 0);
1263 size = OBD_FAIL_PRECHECK(OBD_FAIL_CAT_RECORDS) ?
1264 cfs_fail_val : (LLOG_HDR_BITMAP_SIZE(llh->lgh_hdr) - 1);
1265 /* processing reaches catalog bottom */
1266 if (d->opd_sync_last_catalog_idx == size)
1267 d->opd_sync_last_catalog_idx = LLOG_CAT_FIRST;
1269 /* If catalog is wrapped we can`t predict last index of
1270 * processing because lgh_last_idx could be changed.
1271 * Starting form the next one */
1272 d->opd_sync_last_catalog_idx++;
1274 } while (rc == 0 && (wrapped ||
1275 d->opd_sync_last_catalog_idx == LLOG_CAT_FIRST));
1278 CERROR("%s: llog process with osp_sync_process_queues "
1279 "failed: %d\n", d->opd_obd->obd_name, rc);
1282 LASSERTF(rc == 0 || rc == LLOG_PROC_BREAK,
1283 "%u changes, %u in progress, %u in flight: %d\n",
1284 atomic_read(&d->opd_sync_changes),
1285 atomic_read(&d->opd_sync_rpcs_in_progress),
1286 atomic_read(&d->opd_sync_rpcs_in_flight), rc);
1288 /* we don't expect llog_process_thread() to exit till umount */
1289 LASSERTF(thread->t_flags != SVC_RUNNING,
1290 "%u changes, %u in progress, %u in flight\n",
1291 atomic_read(&d->opd_sync_changes),
1292 atomic_read(&d->opd_sync_rpcs_in_progress),
1293 atomic_read(&d->opd_sync_rpcs_in_flight));
1295 /* wait till all the requests are completed */
1297 while (atomic_read(&d->opd_sync_rpcs_in_progress) > 0) {
1298 osp_sync_process_committed(&env, d);
1300 lwi = LWI_TIMEOUT(cfs_time_seconds(5), NULL, NULL);
1301 rc = l_wait_event(d->opd_sync_waitq,
1302 atomic_read(&d->opd_sync_rpcs_in_progress) == 0,
1304 if (rc == -ETIMEDOUT)
1306 LASSERTF(count < 10, "%s: %d %d %sempty\n",
1307 d->opd_obd->obd_name,
1308 atomic_read(&d->opd_sync_rpcs_in_progress),
1309 atomic_read(&d->opd_sync_rpcs_in_flight),
1310 list_empty(&d->opd_sync_committed_there) ? "" : "!");
1315 llog_cat_close(&env, llh);
1316 rc = llog_cleanup(&env, ctxt);
1318 CERROR("can't cleanup llog: %d\n", rc);
1320 LASSERTF(atomic_read(&d->opd_sync_rpcs_in_progress) == 0,
1321 "%s: %d %d %sempty\n", d->opd_obd->obd_name,
1322 atomic_read(&d->opd_sync_rpcs_in_progress),
1323 atomic_read(&d->opd_sync_rpcs_in_flight),
1324 list_empty(&d->opd_sync_committed_there) ? "" : "!");
1326 thread->t_flags = SVC_STOPPED;
1328 wake_up(&thread->t_ctl_waitq);
1338 * Initializes the llog. Specific llog to be used depends on the type of the
1339 * target OSP represents (OST or MDT). The function adds appends a new llog
1340 * record to mark the place where the records associated with this boot
1343 * \param[in] env LU environment provided by the caller
1344 * \param[in] d OSP device
1346 * \retval 0 on success
1347 * \retval negative negated errno on error
1349 static int osp_sync_llog_init(const struct lu_env *env, struct osp_device *d)
1351 struct osp_thread_info *osi = osp_env_info(env);
1352 struct lu_fid *fid = &osi->osi_fid;
1353 struct llog_handle *lgh = NULL;
1354 struct obd_device *obd = d->opd_obd;
1355 struct llog_ctxt *ctxt;
1363 * open llog corresponding to our OST
1365 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
1366 obd->obd_lvfs_ctxt.dt = d->opd_storage;
1368 lu_local_obj_fid(fid, LLOG_CATALOGS_OID);
1370 rc = llog_osd_get_cat_list(env, d->opd_storage, d->opd_index, 1,
1371 &osi->osi_cid, fid);
1373 if (rc != -EFAULT) {
1374 CERROR("%s: can't get id from catalogs: rc = %d\n",
1379 /* After sparse OST indices is supported, the CATALOG file
1380 * may become a sparse file that results in failure on
1381 * reading. Skip this error as the llog will be created
1383 memset(&osi->osi_cid, 0, sizeof(osi->osi_cid));
1387 CDEBUG(D_INFO, "%s: Init llog for %d - catid "DFID":%x\n",
1388 obd->obd_name, d->opd_index,
1389 PFID(&osi->osi_cid.lci_logid.lgl_oi.oi_fid),
1390 osi->osi_cid.lci_logid.lgl_ogen);
1392 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT,
1393 d->opd_storage->dd_lu_dev.ld_obd,
1394 &llog_common_cat_ops);
1398 ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1401 if (likely(logid_id(&osi->osi_cid.lci_logid) != 0)) {
1402 rc = llog_open(env, ctxt, &lgh, &osi->osi_cid.lci_logid, NULL,
1404 /* re-create llog if it is missing */
1406 logid_set_id(&osi->osi_cid.lci_logid, 0);
1408 GOTO(out_cleanup, rc);
1411 if (unlikely(logid_id(&osi->osi_cid.lci_logid) == 0)) {
1412 rc = llog_open_create(env, ctxt, &lgh, NULL, NULL);
1414 GOTO(out_cleanup, rc);
1415 osi->osi_cid.lci_logid = lgh->lgh_id;
1418 LASSERT(lgh != NULL);
1419 ctxt->loc_handle = lgh;
1421 rc = llog_init_handle(env, lgh, LLOG_F_IS_CAT, NULL);
1423 GOTO(out_close, rc);
1425 rc = llog_osd_put_cat_list(env, d->opd_storage, d->opd_index, 1,
1426 &osi->osi_cid, fid);
1428 GOTO(out_close, rc);
1431 * put a mark in the llog till which we'll be processing
1432 * old records restless
1434 d->opd_sync_generation.mnt_cnt = ktime_get_ns();
1435 d->opd_sync_generation.conn_cnt = ktime_get_ns();
1437 osi->osi_hdr.lrh_type = LLOG_GEN_REC;
1438 osi->osi_hdr.lrh_len = sizeof(osi->osi_gen);
1440 memcpy(&osi->osi_gen.lgr_gen, &d->opd_sync_generation,
1441 sizeof(osi->osi_gen.lgr_gen));
1443 rc = llog_cat_add(env, lgh, &osi->osi_gen.lgr_hdr, &osi->osi_cookie);
1445 GOTO(out_close, rc);
1446 llog_ctxt_put(ctxt);
1449 llog_cat_close(env, lgh);
1451 llog_cleanup(env, ctxt);
1456 * Cleanup llog used for syncing.
1458 * Closes and cleanups the llog. The function is called when the device is
1461 * \param[in] env LU environment provided by the caller
1462 * \param[in] d OSP device
1464 static void osp_sync_llog_fini(const struct lu_env *env, struct osp_device *d)
1466 struct llog_ctxt *ctxt;
1468 ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
1470 llog_cat_close(env, ctxt->loc_handle);
1471 llog_cleanup(env, ctxt);
1476 * Initialization of the sync component of OSP.
1478 * Initializes the llog and starts a new thread to handle the changes to
1479 * the remote target (OST or MDT).
1481 * \param[in] env LU environment provided by the caller
1482 * \param[in] d OSP device
1484 * \retval 0 on success
1485 * \retval negative negated errno on error
1487 int osp_sync_init(const struct lu_env *env, struct osp_device *d)
1489 struct l_wait_info lwi = { 0 };
1490 struct task_struct *task;
1495 d->opd_sync_max_rpcs_in_flight = OSP_MAX_RPCS_IN_FLIGHT;
1496 d->opd_sync_max_rpcs_in_progress = OSP_MAX_RPCS_IN_PROGRESS;
1497 spin_lock_init(&d->opd_sync_lock);
1498 init_waitqueue_head(&d->opd_sync_waitq);
1499 init_waitqueue_head(&d->opd_sync_barrier_waitq);
1500 thread_set_flags(&d->opd_sync_thread, SVC_INIT);
1501 init_waitqueue_head(&d->opd_sync_thread.t_ctl_waitq);
1502 INIT_LIST_HEAD(&d->opd_sync_in_flight_list);
1503 INIT_LIST_HEAD(&d->opd_sync_committed_there);
1505 if (d->opd_storage->dd_rdonly)
1509 * initialize llog storing changes
1511 rc = osp_sync_llog_init(env, d);
1513 CERROR("%s: can't initialize llog: rc = %d\n",
1514 d->opd_obd->obd_name, rc);
1519 * Start synchronization thread
1521 task = kthread_run(osp_sync_thread, d, "osp-syn-%u-%u",
1522 d->opd_index, d->opd_group);
1525 CERROR("%s: cannot start sync thread: rc = %d\n",
1526 d->opd_obd->obd_name, rc);
1530 l_wait_event(d->opd_sync_thread.t_ctl_waitq,
1531 osp_sync_running(d) || osp_sync_stopped(d), &lwi);
1535 osp_sync_llog_fini(env, d);
1541 * Stop the syncing thread.
1543 * Asks the syncing thread to stop and wait until it's stopped.
1545 * \param[in] d OSP device
1549 int osp_sync_fini(struct osp_device *d)
1551 struct ptlrpc_thread *thread = &d->opd_sync_thread;
1555 if (!thread_is_init(thread) && !thread_is_stopped(thread)) {
1556 thread->t_flags = SVC_STOPPING;
1557 wake_up(&d->opd_sync_waitq);
1558 wait_event(thread->t_ctl_waitq, thread_is_stopped(thread));
1564 struct osp_last_committed_cb {
1565 struct dt_txn_commit_cb ospc_cb;
1566 struct osp_device *ospc_dev;
1570 void osp_sync_local_commit_cb(struct lu_env *env, struct thandle *th,
1571 struct dt_txn_commit_cb *dcb, int err)
1573 struct osp_last_committed_cb *cb;
1574 struct osp_device *d;
1576 cb = container_of0(dcb, struct osp_last_committed_cb, ospc_cb);
1579 CDEBUG(D_HA, "%s: %llu committed\n", d->opd_obd->obd_name,
1582 spin_lock(&d->opd_sync_lock);
1583 if (cb->ospc_transno > d->opd_sync_last_committed_id)
1584 d->opd_sync_last_committed_id = cb->ospc_transno;
1585 spin_unlock(&d->opd_sync_lock);
1587 osp_sync_check_for_work(d);
1588 lu_device_put(osp2lu_dev(d));
1589 if (atomic_dec_and_test(&d->opd_commits_registered))
1590 wake_up(&d->opd_sync_waitq);
1595 static int osp_sync_add_commit_cb(const struct lu_env *env,
1596 struct osp_device *d, struct thandle *th)
1598 struct osp_last_committed_cb *cb;
1599 struct dt_txn_commit_cb *dcb;
1607 dcb->dcb_func = osp_sync_local_commit_cb;
1608 spin_lock(&d->opd_sync_lock);
1609 cb->ospc_transno = ++d->opd_sync_last_used_id;
1610 spin_unlock(&d->opd_sync_lock);
1612 rc = dt_trans_cb_add(th, dcb);
1613 CDEBUG(D_HA, "%s: add commit cb at %lluns, next at %lluns, rc = %d\n",
1614 d->opd_obd->obd_name, ktime_get_ns(),
1615 ktime_to_ns(d->opd_sync_next_commit_cb), rc);
1617 if (likely(rc == 0)) {
1618 lu_device_get(osp2lu_dev(d));
1619 atomic_inc(&d->opd_commits_registered);
1626 /* add the commit callback every second */
1627 int osp_sync_add_commit_cb_1s(const struct lu_env *env, struct osp_device *d,
1630 ktime_t now = ktime_get();
1634 if (ktime_before(now, d->opd_sync_next_commit_cb))
1637 spin_lock(&d->opd_sync_lock);
1638 if (ktime_before(d->opd_sync_next_commit_cb, now)) {
1640 d->opd_sync_next_commit_cb = ktime_add_ns(now, NSEC_PER_SEC);
1642 spin_unlock(&d->opd_sync_lock);
1647 return osp_sync_add_commit_cb(env, d, th);
1651 * generate an empty transaction and hook the commit callback in
1652 * then force transaction commit
1654 void osp_sync_force(const struct lu_env *env, struct osp_device *d)
1659 th = dt_trans_create(env, d->opd_storage);
1661 CERROR("%s: can't sync\n", d->opd_obd->obd_name);
1664 rc = dt_trans_start_local(env, d->opd_storage, th);
1666 CDEBUG(D_OTHER, "%s: sync forced, %d changes\n",
1667 d->opd_obd->obd_name,
1668 atomic_read(&d->opd_sync_changes));
1669 rc = osp_sync_add_commit_cb(env, d, th);
1670 dt_trans_stop(env, d->opd_storage, th);
1673 dt_commit_async(env, d->opd_storage);