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/
31 * lustre/osp/osp_sync.c
33 * Lustre OST Proxy Device
35 * Author: Alex Zhuravlev <alexey.zhuravlev@intel.com>
36 * Author: Mikhail Pershin <mike.pershin@intel.com>
39 #define DEBUG_SUBSYSTEM S_MDS
41 #include <linux/kthread.h>
42 #include <linux/delay.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
86 #define OSP_MAX_SYNC_CHANGES 2000000000
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);
103 ** Check for new changes to sync
105 * \param[in] d OSP device
107 * \retval 1 there are changes
108 * \retval 0 there are no changes
110 static inline int osp_sync_has_new_job(struct osp_device *d)
112 return atomic_read(&d->opd_sync_changes) > 0 ||
113 d->opd_sync_prev_done == 0;
116 static inline int osp_sync_in_flight_conflict(struct osp_device *d,
117 struct llog_rec_hdr *h)
119 struct osp_job_req_args *jra;
123 if (h == NULL || h->lrh_type == LLOG_GEN_REC ||
124 list_empty(&d->opd_sync_in_flight_list))
127 memset(&ostid, 0, sizeof(ostid));
128 switch (h->lrh_type) {
129 case MDS_UNLINK_REC: {
130 struct llog_unlink_rec *unlink = (struct llog_unlink_rec *)h;
132 ostid_set_seq(&ostid, unlink->lur_oseq);
133 if (ostid_set_id(&ostid, unlink->lur_oid)) {
134 CERROR("Bad %llu to set " DOSTID "\n",
135 (unsigned long long)(unlink->lur_oid),
141 case MDS_UNLINK64_REC:
142 fid_to_ostid(&((struct llog_unlink64_rec *)h)->lur_fid, &ostid);
144 case MDS_SETATTR64_REC:
145 ostid = ((struct llog_setattr64_rec *)h)->lsr_oi;
151 spin_lock(&d->opd_sync_lock);
152 list_for_each_entry(jra, &d->opd_sync_in_flight_list,
153 jra_in_flight_link) {
154 struct ptlrpc_request *req;
155 struct ost_body *body;
157 LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
159 req = container_of((void *)jra, struct ptlrpc_request,
161 body = req_capsule_client_get(&req->rq_pill,
165 if (memcmp(&ostid, &body->oa.o_oi, sizeof(ostid)) == 0) {
170 spin_unlock(&d->opd_sync_lock);
175 static inline int osp_sync_rpcs_in_progress_low(struct osp_device *d)
177 return atomic_read(&d->opd_sync_rpcs_in_progress) <
178 d->opd_sync_max_rpcs_in_progress;
182 * Check for room in the network pipe to OST
184 * \param[in] d OSP device
186 * \retval 1 there is room
187 * \retval 0 no room, the pipe is full
189 static inline int osp_sync_rpcs_in_flight_low(struct osp_device *d)
191 return atomic_read(&d->opd_sync_rpcs_in_flight) <
192 d->opd_sync_max_rpcs_in_flight;
196 * Wake up check for the main sync thread
198 * \param[in] d OSP device
200 * \retval 1 time to wake up
201 * \retval 0 no need to wake up
203 static inline int osp_sync_has_work(struct osp_device *osp)
205 /* has new/old changes and low in-progress? */
206 if (osp_sync_has_new_job(osp) && osp_sync_rpcs_in_progress_low(osp) &&
207 osp_sync_rpcs_in_flight_low(osp) && osp->opd_imp_connected)
210 /* has remotely committed? */
211 if (!list_empty(&osp->opd_sync_committed_there))
217 void osp_sync_check_for_work(struct osp_device *osp)
219 if (osp_sync_has_work(osp))
220 wake_up(&osp->opd_sync_waitq);
223 static inline __u64 osp_sync_correct_id(struct osp_device *d,
224 struct llog_rec_hdr *rec)
227 * llog use cyclic store with 32 bit lrh_id
228 * so overflow lrh_id is possible. Range between
229 * last_processed and last_committed is less than
230 * 64745 ^ 2 and less than 2^32 - 1
232 __u64 correct_id = d->opd_sync_last_committed_id;
234 if ((correct_id & 0xffffffffULL) < rec->lrh_id)
235 correct_id -= 0x100000000ULL;
237 correct_id &= ~0xffffffffULL;
238 correct_id |= rec->lrh_id;
244 * Check and return ready-for-new status.
246 * The thread processing llog record uses this function to check whether
247 * it's time to take another record and process it. The number of conditions
248 * must be met: the connection should be ready, RPCs in flight not exceeding
249 * the limit, the record is committed locally, etc (see the lines below).
251 * \param[in] d OSP device
252 * \param[in] rec next llog record to process
254 * \retval 0 not ready
257 static inline int osp_sync_can_process_new(struct osp_device *d,
258 struct llog_rec_hdr *rec)
262 if (unlikely(atomic_read(&d->opd_sync_barrier) > 0))
264 if (unlikely(osp_sync_in_flight_conflict(d, rec)))
266 if (!osp_sync_rpcs_in_progress_low(d))
268 if (!osp_sync_rpcs_in_flight_low(d))
270 if (!d->opd_imp_connected)
272 if (d->opd_sync_prev_done == 0)
274 if (atomic_read(&d->opd_sync_changes) == 0)
278 /* notice "<" not "<=" */
279 if (osp_sync_correct_id(d, rec) < d->opd_sync_last_committed_id)
285 * Declare intention to add a new change.
287 * With regard to OSD API, we have to declare any changes ahead. In this
288 * case we declare an intention to add a llog record representing the
289 * change on the local storage.
291 * \param[in] env LU environment provided by the caller
292 * \param[in] o OSP object
293 * \param[in] type type of change: MDS_UNLINK64_REC or MDS_SETATTR64_REC
294 * \param[in] th transaction handle (local)
296 * \retval 0 on success
297 * \retval negative negated errno on error
299 int osp_sync_declare_add(const struct lu_env *env, struct osp_object *o,
300 enum llog_op_type type, struct thandle *th)
302 struct osp_thread_info *osi = osp_env_info(env);
303 struct osp_device *d = lu2osp_dev(o->opo_obj.do_lu.lo_dev);
304 struct llog_ctxt *ctxt;
305 struct thandle *storage_th;
310 /* it's a layering violation, to access internals of th,
311 * but we can do this as a sanity check, for a while */
312 LASSERT(th->th_top != NULL);
314 if (atomic_read(&d->opd_sync_changes) > d->opd_sync_max_changes) {
315 /* Attempt to slow sync changes queuing rate */
316 CWARN("%s: queued changes counter exceeds limit %d > %d\n",
317 d->opd_obd->obd_name, atomic_read(&d->opd_sync_changes),
318 d->opd_sync_max_changes);
319 RETURN(-EINPROGRESS);
321 storage_th = thandle_get_sub_by_dt(env, th->th_top, d->opd_storage);
322 if (IS_ERR(storage_th))
323 RETURN(PTR_ERR(storage_th));
326 case MDS_UNLINK64_REC:
327 osi->osi_hdr.lrh_len = sizeof(struct llog_unlink64_rec);
329 case MDS_SETATTR64_REC:
330 osi->osi_hdr.lrh_len = sizeof(struct llog_setattr64_rec_v2);
336 ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
338 /* for a reason OSP wasn't able to open llog,
339 * just skip logging this operation and hope
340 * LFSCK will fix it eventually */
341 CERROR("logging isn't available, run LFSCK\n");
345 rc = llog_declare_add(env, ctxt->loc_handle, &osi->osi_hdr,
353 * Generate a llog record for a given change.
355 * Generates a llog record for the change passed. The change can be of two
356 * types: unlink and setattr. The record gets an ID which later will be
357 * used to track commit status of the change. For unlink changes, the caller
358 * can supply a starting FID and the count of the objects to destroy. For
359 * setattr the caller should apply attributes to apply.
362 * \param[in] env LU environment provided by the caller
363 * \param[in] d OSP device
364 * \param[in] fid fid of the object the change should be applied to
365 * \param[in] type type of change: MDS_UNLINK64_REC or MDS_SETATTR64_REC
366 * \param[in] count count of objects to destroy
367 * \param[in] th transaction handle (local)
368 * \param[in] attr attributes for setattr
370 * \retval 0 on success
371 * \retval negative negated errno on error
373 static int osp_sync_add_rec(const struct lu_env *env, struct osp_device *d,
374 const struct lu_fid *fid, enum llog_op_type type,
375 int count, struct thandle *th,
376 const struct lu_attr *attr)
378 struct osp_thread_info *osi = osp_env_info(env);
379 struct llog_ctxt *ctxt;
380 struct thandle *storage_th;
381 bool immediate_commit_cb = false;
386 /* it's a layering violation, to access internals of th,
387 * but we can do this as a sanity check, for a while */
388 LASSERT(th->th_top != NULL);
389 storage_th = thandle_get_sub_by_dt(env, th->th_top, d->opd_storage);
390 if (IS_ERR(storage_th))
391 RETURN(PTR_ERR(storage_th));
394 case MDS_UNLINK64_REC:
395 osi->osi_hdr.lrh_len = sizeof(osi->osi_unlink);
396 osi->osi_hdr.lrh_type = MDS_UNLINK64_REC;
397 osi->osi_unlink.lur_fid = *fid;
398 osi->osi_unlink.lur_count = count;
400 case MDS_SETATTR64_REC:
401 rc = fid_to_ostid(fid, &osi->osi_oi);
403 osi->osi_hdr.lrh_len = sizeof(osi->osi_setattr);
404 osi->osi_hdr.lrh_type = MDS_SETATTR64_REC;
405 osi->osi_setattr.lsr_oi = osi->osi_oi;
407 osi->osi_setattr.lsr_uid = attr->la_uid;
408 osi->osi_setattr.lsr_gid = attr->la_gid;
409 osi->osi_setattr.lsr_layout_version = attr->la_layout_version;
410 osi->osi_setattr.lsr_projid = attr->la_projid;
411 osi->osi_setattr.lsr_valid =
412 ((attr->la_valid & LA_UID) ? OBD_MD_FLUID : 0) |
413 ((attr->la_valid & LA_GID) ? OBD_MD_FLGID : 0) |
414 ((attr->la_valid & LA_PROJID) ? OBD_MD_FLPROJID : 0);
415 if (attr->la_valid & LA_LAYOUT_VERSION) {
416 osi->osi_setattr.lsr_valid |= OBD_MD_LAYOUT_VERSION;
418 /* FLR: the layout version has to be transferred to
419 * OST objects ASAP, otherwise clients will have to
420 * experience delay to be able to write OST objects. */
421 immediate_commit_cb = true;
428 /* we keep the same id, but increment it when the callback
429 * is registered, so that all records upto the one taken
430 * by the callback are subject to processing */
431 spin_lock(&d->opd_sync_lock);
432 osi->osi_hdr.lrh_id = d->opd_sync_last_used_id;
433 spin_unlock(&d->opd_sync_lock);
435 ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
437 /* see comment in osp_sync_declare_add() */
441 rc = llog_add(env, ctxt->loc_handle, &osi->osi_hdr, &osi->osi_cookie,
445 if (likely(rc >= 0)) {
446 CDEBUG(D_OTHER, "%s: new record "DFID":%x.%u: rc = %d\n",
447 d->opd_obd->obd_name,
448 PFID(&osi->osi_cookie.lgc_lgl.lgl_oi.oi_fid),
449 osi->osi_cookie.lgc_lgl.lgl_ogen,
450 osi->osi_cookie.lgc_index, rc);
451 atomic_inc(&d->opd_sync_changes);
454 if (immediate_commit_cb)
455 rc = osp_sync_add_commit_cb(env, d, th);
457 rc = osp_sync_add_commit_cb_1s(env, d, th);
459 /* return 0 always here, error case just cause no llog record */
463 int osp_sync_add(const struct lu_env *env, struct osp_object *o,
464 enum llog_op_type type, struct thandle *th,
465 const struct lu_attr *attr)
467 return osp_sync_add_rec(env, lu2osp_dev(o->opo_obj.do_lu.lo_dev),
468 lu_object_fid(&o->opo_obj.do_lu), type, 1,
472 int osp_sync_gap(const struct lu_env *env, struct osp_device *d,
473 struct lu_fid *fid, int lost, struct thandle *th)
475 return osp_sync_add_rec(env, d, fid, MDS_UNLINK64_REC, lost, th, NULL);
479 * it's quite obvious we can't maintain all the structures in the memory:
480 * while OST is down, MDS can be processing thousands and thousands of unlinks
481 * filling persistent llogs and in-core respresentation
483 * this doesn't scale at all. so we need basically the following:
484 * a) destroy/setattr append llog records
485 * b) once llog has grown to X records, we process first Y committed records
487 * once record R is found via llog_process(), it becomes committed after any
488 * subsequent commit callback (at the most)
492 * ptlrpc commit callback.
494 * The callback is called by PTLRPC when a RPC is reported committed by the
495 * target (OST). We register the callback for the every RPC applying a change
496 * from the llog. This way we know then the llog records can be cancelled.
497 * Notice the callback can be called when OSP is finishing. We can detect this
498 * checking that actual transno in the request is less or equal of known
499 * committed transno (see osp_sync_process_committed() for the details).
500 * XXX: this is pretty expensive and can be improved later using batching.
502 * \param[in] req request
504 static void osp_sync_request_commit_cb(struct ptlrpc_request *req)
506 struct osp_device *d = req->rq_cb_data;
507 struct osp_job_req_args *jra;
509 CDEBUG(D_HA, "commit req %p, transno %llu\n", req, req->rq_transno);
511 if (unlikely(req->rq_transno == 0))
514 /* do not do any opd_sync_rpcs_* accounting here
515 * it's done in osp_sync_interpret sooner or later */
518 jra = ptlrpc_req_async_args(jra, req);
519 LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
520 LASSERT(list_empty(&jra->jra_committed_link));
522 ptlrpc_request_addref(req);
524 spin_lock(&d->opd_sync_lock);
525 list_add(&jra->jra_committed_link, &d->opd_sync_committed_there);
526 spin_unlock(&d->opd_sync_lock);
528 /* XXX: some batching wouldn't hurt */
529 wake_up(&d->opd_sync_waitq);
533 * RPC interpretation callback.
535 * The callback is called by ptlrpc when RPC is replied. Now we have to decide
537 * - put request on a special list to wait until it's committed by the target,
538 * if the request is successful
539 * - schedule llog record cancel if no target object is found
540 * - try later (essentially after reboot) in case of unexpected error
542 * \param[in] env LU environment provided by the caller
543 * \param[in] req request replied
544 * \param[in] aa callback data
545 * \param[in] rc result of RPC
549 static int osp_sync_interpret(const struct lu_env *env,
550 struct ptlrpc_request *req, void *args, int rc)
552 struct osp_job_req_args *jra = args;
553 struct osp_device *d = req->rq_cb_data;
555 if (jra->jra_magic != OSP_JOB_MAGIC) {
556 DEBUG_REQ(D_ERROR, req, "bad magic %u", jra->jra_magic);
561 CDEBUG(D_HA, "reply req %p/%d, rc %d, transno %u\n", req,
562 atomic_read(&req->rq_refcount),
563 rc, (unsigned) req->rq_transno);
567 * we tried to destroy object or update attributes,
568 * but object doesn't exist anymore - cancell llog record
570 LASSERT(req->rq_transno == 0);
571 LASSERT(list_empty(&jra->jra_committed_link));
573 ptlrpc_request_addref(req);
575 spin_lock(&d->opd_sync_lock);
576 list_add(&jra->jra_committed_link,
577 &d->opd_sync_committed_there);
578 spin_unlock(&d->opd_sync_lock);
580 wake_up(&d->opd_sync_waitq);
582 struct obd_import *imp = req->rq_import;
584 * error happened, we'll try to repeat on next boot ?
586 LASSERTF(req->rq_transno == 0 || rc == -EIO || rc == -EROFS ||
587 req->rq_import_generation < imp->imp_generation,
588 "transno %llu, rc %d, gen: req %d, imp %d\n",
589 req->rq_transno, rc, req->rq_import_generation,
590 imp->imp_generation);
591 if (req->rq_transno == 0) {
592 /* this is the last time we see the request
593 * if transno is not zero, then commit cb
594 * will be called at some point */
595 LASSERT(atomic_read(&d->opd_sync_rpcs_in_progress) > 0);
596 atomic_dec(&d->opd_sync_rpcs_in_progress);
599 wake_up(&d->opd_sync_waitq);
600 } else if (d->opd_pre != NULL &&
601 unlikely(d->opd_pre_status == -ENOSPC)) {
603 * if current status is -ENOSPC (lack of free space on OST)
604 * then we should poll OST immediately once object destroy
607 osp_statfs_need_now(d);
610 spin_lock(&d->opd_sync_lock);
611 list_del_init(&jra->jra_in_flight_link);
612 spin_unlock(&d->opd_sync_lock);
613 LASSERT(atomic_read(&d->opd_sync_rpcs_in_flight) > 0);
614 atomic_dec(&d->opd_sync_rpcs_in_flight);
615 if (unlikely(atomic_read(&d->opd_sync_barrier) > 0))
616 wake_up(&d->opd_sync_barrier_waitq);
617 CDEBUG(D_OTHER, "%s: %d in flight, %d in progress\n",
618 d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight),
619 atomic_read(&d->opd_sync_rpcs_in_progress));
621 osp_sync_check_for_work(d);
627 ** Add request to ptlrpc queue.
629 * This is just a tiny helper function to put the request on the sending list
631 * \param[in] d OSP device
632 * \param[in] llh llog handle where the record is stored
633 * \param[in] h llog record
634 * \param[in] req request
636 static void osp_sync_send_new_rpc(struct osp_device *d,
637 struct llog_handle *llh,
638 struct llog_rec_hdr *h,
639 struct ptlrpc_request *req)
641 struct osp_job_req_args *jra;
643 LASSERT(atomic_read(&d->opd_sync_rpcs_in_flight) <=
644 d->opd_sync_max_rpcs_in_flight);
646 jra = ptlrpc_req_async_args(jra, req);
647 jra->jra_magic = OSP_JOB_MAGIC;
648 jra->jra_lcookie.lgc_lgl = llh->lgh_id;
649 jra->jra_lcookie.lgc_subsys = LLOG_MDS_OST_ORIG_CTXT;
650 jra->jra_lcookie.lgc_index = h->lrh_index;
651 INIT_LIST_HEAD(&jra->jra_committed_link);
652 spin_lock(&d->opd_sync_lock);
653 list_add_tail(&jra->jra_in_flight_link, &d->opd_sync_in_flight_list);
654 spin_unlock(&d->opd_sync_lock);
656 ptlrpcd_add_req(req);
661 * Allocate and prepare RPC for a new change.
663 * The function allocates and initializes an RPC which will be sent soon to
664 * apply the change to the target OST. The request is initialized from the
665 * llog record passed. Notice only the fields common to all type of changes
668 * \param[in] d OSP device
669 * \param[in] op type of the change
670 * \param[in] format request format to be used
672 * \retval pointer new request on success
673 * \retval ERR_PTR(errno) on error
675 static struct ptlrpc_request *osp_sync_new_job(struct osp_device *d,
677 const struct req_format *format)
679 struct ptlrpc_request *req;
680 struct obd_import *imp;
683 /* Prepare the request */
684 imp = d->opd_obd->u.cli.cl_import;
687 if (OBD_FAIL_CHECK(OBD_FAIL_OSP_CHECK_ENOMEM))
688 RETURN(ERR_PTR(-ENOMEM));
690 req = ptlrpc_request_alloc(imp, format);
692 RETURN(ERR_PTR(-ENOMEM));
694 rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, op);
696 ptlrpc_req_finished(req);
700 req->rq_interpret_reply = osp_sync_interpret;
701 req->rq_commit_cb = osp_sync_request_commit_cb;
704 ptlrpc_request_set_replen(req);
710 * Generate a request for setattr change.
712 * The function prepares a new RPC, initializes it with setattr specific
713 * bits and send the RPC.
715 * \param[in] d OSP device
716 * \param[in] llh llog handle where the record is stored
717 * \param[in] h llog record
719 * \retval 0 on success
720 * \retval 1 on invalid record
721 * \retval negative negated errno on error
723 static int osp_sync_new_setattr_job(struct osp_device *d,
724 struct llog_handle *llh,
725 struct llog_rec_hdr *h)
727 struct llog_setattr64_rec *rec = (struct llog_setattr64_rec *)h;
728 struct ptlrpc_request *req;
729 struct ost_body *body;
732 LASSERT(h->lrh_type == MDS_SETATTR64_REC);
734 if (OBD_FAIL_CHECK(OBD_FAIL_OSP_CHECK_INVALID_REC))
737 /* lsr_valid can only be 0 or HAVE OBD_MD_{FLUID, FLGID, FLPROJID} set,
738 * so no bits other than these should be set. */
739 if ((rec->lsr_valid & ~(OBD_MD_FLUID | OBD_MD_FLGID |
740 OBD_MD_FLPROJID | OBD_MD_LAYOUT_VERSION)) != 0) {
741 CERROR("%s: invalid setattr record, lsr_valid:%llu\n",
742 d->opd_obd->obd_name, rec->lsr_valid);
743 /* return 1 on invalid record */
747 req = osp_sync_new_job(d, OST_SETATTR, &RQF_OST_SETATTR);
749 RETURN(PTR_ERR(req));
751 body = req_capsule_client_get(&req->rq_pill, &RMF_OST_BODY);
753 body->oa.o_oi = rec->lsr_oi;
754 body->oa.o_uid = rec->lsr_uid;
755 body->oa.o_gid = rec->lsr_gid;
756 body->oa.o_valid = OBD_MD_FLGROUP | OBD_MD_FLID;
757 if (h->lrh_len > sizeof(struct llog_setattr64_rec)) {
758 struct llog_setattr64_rec_v2 *rec_v2 = (typeof(rec_v2))rec;
759 body->oa.o_projid = rec_v2->lsr_projid;
760 body->oa.o_layout_version = rec_v2->lsr_layout_version;
763 /* old setattr record (prior 2.6.0) doesn't have 'valid' stored,
764 * we assume that both UID and GID are valid in that case. */
765 if (rec->lsr_valid == 0)
766 body->oa.o_valid |= (OBD_MD_FLUID | OBD_MD_FLGID);
768 body->oa.o_valid |= rec->lsr_valid;
770 if (body->oa.o_valid & OBD_MD_LAYOUT_VERSION) {
771 OBD_FAIL_TIMEOUT(OBD_FAIL_FLR_LV_DELAY, cfs_fail_val);
772 if (unlikely(OBD_FAIL_CHECK(OBD_FAIL_FLR_LV_INC)))
773 body->oa.o_layout_version = LU_LAYOUT_RESYNC |
774 (body->oa.o_layout_version + 1);
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_OTHER, "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;
1011 struct list_head *le;
1012 struct llog_logid lgid;
1013 int rc, i, count = 0, done = 0;
1017 if (list_empty(&d->opd_sync_committed_there))
1021 * if current status is -ENOSPC (lack of free space on OST)
1022 * then we should poll OST immediately once object destroy
1024 * notice: we do this upon commit as well because some backends
1025 * (like DMU) do not release space right away.
1027 if (d->opd_pre != NULL && unlikely(d->opd_pre_status == -ENOSPC))
1028 osp_statfs_need_now(d);
1031 * now cancel them all
1032 * XXX: can we improve this using some batching?
1033 * with batch RPC that'll happen automatically?
1034 * XXX: can we store ctxt in lod_device and save few cycles ?
1036 ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1039 llh = ctxt->loc_handle;
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 arr_size = sizeof(int) * count;
1051 /* limit cookie array to order 2 */
1052 arr_size = arr_size < (PAGE_SIZE * 4) ? arr_size :
1054 OBD_ALLOC_LARGE(arr, arr_size);
1060 while (!list_empty(&list)) {
1061 struct osp_job_req_args *jra;
1063 jra = list_entry(list.next, struct osp_job_req_args,
1064 jra_committed_link);
1065 LASSERT(jra->jra_magic == OSP_JOB_MAGIC);
1066 list_del_init(&jra->jra_committed_link);
1068 req = container_of((void *)jra, struct ptlrpc_request,
1070 body = req_capsule_client_get(&req->rq_pill,
1073 /* import can be closing, thus all commit cb's are
1074 * called we can check committness directly */
1075 if (req->rq_import_generation == imp->imp_generation) {
1077 !memcmp(&jra->jra_lcookie.lgc_lgl, &lgid,
1080 lgid = jra->jra_lcookie.lgc_lgl;
1082 arr[i++] = jra->jra_lcookie.lgc_index;
1084 rc = llog_cat_cancel_records(env, llh, 1,
1087 CERROR("%s: can't cancel record: rc = %d\n",
1091 DEBUG_REQ(D_OTHER, req, "imp_committed = %llu",
1092 imp->imp_peer_committed_transno);
1094 ptlrpc_req_finished(req);
1097 ((i * sizeof(int)) == arr_size ||
1098 (list_empty(&list) && i > 0))) {
1099 rc = llog_cat_cancel_arr_rec(env, llh, &lgid, i, arr);
1102 CERROR("%s: can't cancel %d records: rc = %d\n",
1103 obd->obd_name, i, rc);
1105 CDEBUG(D_OTHER, "%s: massive records cancel id "DFID" num %d\n",
1106 obd->obd_name, PFID(&lgid.lgl_oi.oi_fid),
1114 OBD_FREE_LARGE(arr, arr_size);
1116 llog_ctxt_put(ctxt);
1118 LASSERT(atomic_read(&d->opd_sync_rpcs_in_progress) >= done);
1119 atomic_sub(done, &d->opd_sync_rpcs_in_progress);
1120 CDEBUG((done > 2 ? D_HA : D_OTHER), "%s: %u changes, %u in progress,"
1121 " %u in flight, %u done\n",
1122 d->opd_obd->obd_name,
1123 atomic_read(&d->opd_sync_changes),
1124 atomic_read(&d->opd_sync_rpcs_in_progress),
1125 atomic_read(&d->opd_sync_rpcs_in_flight),
1128 osp_sync_check_for_work(d);
1130 /* wake up the thread if requested to stop:
1131 * it might be waiting for in-progress to complete
1133 if (atomic_read(&d->opd_sync_rpcs_in_progress) == 0)
1134 wake_up(&d->opd_sync_waitq);
1140 * The core of the syncing mechanism.
1142 * This is a callback called by the llog processing function. Essentially it
1143 * suspends llog processing until there is a record to process (it's supposed
1144 * to be committed locally). The function handles RPCs committed by the target
1145 * and cancels corresponding llog records.
1147 * \param[in] env LU environment provided by the caller
1148 * \param[in] llh llog handle we're processing
1149 * \param[in] rec current llog record
1150 * \param[in] data callback data containing a pointer to the device
1152 * \retval 0 to ask the caller (llog_process()) to continue
1153 * \retval LLOG_PROC_BREAK to ask the caller to break
1155 static int osp_sync_process_queues(const struct lu_env *env,
1156 struct llog_handle *llh,
1157 struct llog_rec_hdr *rec,
1160 struct osp_device *d = data;
1163 if (!d->opd_sync_task) {
1164 CDEBUG(D_HA, "stop llog processing\n");
1165 return LLOG_PROC_BREAK;
1168 /* process requests committed by OST */
1169 osp_sync_process_committed(env, d);
1171 /* if we there are changes to be processed and we have
1172 * resources for this ... do now */
1173 if (osp_sync_can_process_new(d, rec)) {
1175 /* ask llog for another record */
1178 osp_sync_process_record(env, d, llh, rec);
1182 if (OBD_FAIL_PRECHECK(OBD_FAIL_CATALOG_FULL_CHECK) &&
1184 msleep(1 * MSEC_PER_SEC);
1186 wait_event_idle(d->opd_sync_waitq,
1187 !d->opd_sync_task ||
1188 osp_sync_can_process_new(d, rec) ||
1189 !list_empty(&d->opd_sync_committed_there));
1193 struct osp_sync_args {
1194 struct osp_device *osa_dev;
1195 struct lu_env osa_env;
1196 struct completion *osa_started;
1202 * This thread runs llog_cat_process() scanner calling our callback
1203 * to process llog records. in the callback we implement tricky
1204 * state machine as we don't want to start scanning of the llog again
1205 * and again, also we don't want to process too many records and send
1206 * too many RPCs a time. so, depending on current load (num of changes
1207 * being synced to OST) the callback can suspend awaiting for some
1208 * new conditions, like syncs completed.
1210 * In order to process llog records left by previous boots and to allow
1211 * llog_process_thread() to find something (otherwise it'd just exit
1212 * immediately) we add a special GENERATATION record on each boot.
1214 * \param[in] _arg a pointer to thread's arguments
1216 * \retval 0 on success
1217 * \retval negative negated errno on error
1219 static int osp_sync_thread(void *_args)
1221 struct osp_sync_args *args = _args;
1222 struct osp_device *d = args->osa_dev;
1223 struct llog_ctxt *ctxt;
1224 struct obd_device *obd = d->opd_obd;
1225 struct llog_handle *llh;
1226 struct lu_env *env = &args->osa_env;
1232 complete(args->osa_started);
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 if (OBD_FAIL_CHECK(OBD_FAIL_OSP_CANT_PROCESS_LLOG)) {
1264 rc = llog_cat_process(env, llh, osp_sync_process_queues, d,
1265 d->opd_sync_last_catalog_idx, 0);
1268 size = OBD_FAIL_PRECHECK(OBD_FAIL_CAT_RECORDS) ?
1269 cfs_fail_val : (LLOG_HDR_BITMAP_SIZE(llh->lgh_hdr) - 1);
1270 /* processing reaches catalog bottom */
1271 if (d->opd_sync_last_catalog_idx == size)
1272 d->opd_sync_last_catalog_idx = LLOG_CAT_FIRST;
1273 /* If catalog is wrapped we can`t predict last index of
1274 * processing because lgh_last_idx could be changed.
1275 * Starting form the next one. Index would be increased
1276 * at llog_process_thread
1278 } while (rc == 0 && (wrapped ||
1279 d->opd_sync_last_catalog_idx == LLOG_CAT_FIRST));
1282 if (rc == -EINPROGRESS) {
1283 /* can't access the llog now - OI scrub is trying to fix
1284 * underlying issue. let's wait and try again */
1285 llog_cat_close(env, llh);
1286 rc = llog_cleanup(env, ctxt);
1289 schedule_timeout_interruptible(cfs_time_seconds(5));
1293 CERROR("%s: llog process with osp_sync_process_queues "
1294 "failed: %d\n", d->opd_obd->obd_name, rc);
1297 LASSERTF(rc == 0 || rc == LLOG_PROC_BREAK,
1298 "%u changes, %u in progress, %u in flight: %d\n",
1299 atomic_read(&d->opd_sync_changes),
1300 atomic_read(&d->opd_sync_rpcs_in_progress),
1301 atomic_read(&d->opd_sync_rpcs_in_flight), rc);
1303 /* we don't expect llog_process_thread() to exit till umount */
1304 LASSERTF(kthread_should_stop(),
1305 "%u changes, %u in progress, %u in flight\n",
1306 atomic_read(&d->opd_sync_changes),
1307 atomic_read(&d->opd_sync_rpcs_in_progress),
1308 atomic_read(&d->opd_sync_rpcs_in_flight));
1311 /* wait till all the requests are completed */
1313 while (atomic_read(&d->opd_sync_rpcs_in_progress) > 0) {
1314 osp_sync_process_committed(env, d);
1316 rc = wait_event_idle_timeout(
1318 atomic_read(&d->opd_sync_rpcs_in_progress) == 0,
1319 cfs_time_seconds(5));
1322 LASSERTF(count < 10, "%s: %d %d %sempty\n",
1323 d->opd_obd->obd_name,
1324 atomic_read(&d->opd_sync_rpcs_in_progress),
1325 atomic_read(&d->opd_sync_rpcs_in_flight),
1326 list_empty(&d->opd_sync_committed_there) ? "" : "!");
1330 llog_cat_close(env, llh);
1331 rc = llog_cleanup(env, ctxt);
1333 CERROR("can't cleanup llog: %d\n", rc);
1335 LASSERTF(atomic_read(&d->opd_sync_rpcs_in_progress) == 0,
1336 "%s: %d %d %sempty\n", d->opd_obd->obd_name,
1337 atomic_read(&d->opd_sync_rpcs_in_progress),
1338 atomic_read(&d->opd_sync_rpcs_in_flight),
1339 list_empty(&d->opd_sync_committed_there) ? "" : "!");
1343 if (xchg(&d->opd_sync_task, NULL) == NULL)
1344 /* already being waited for */
1345 wait_event_interruptible(d->opd_sync_waitq,
1346 kthread_should_stop());
1355 * Initializes the llog. Specific llog to be used depends on the type of the
1356 * target OSP represents (OST or MDT). The function adds appends a new llog
1357 * record to mark the place where the records associated with this boot
1360 * \param[in] env LU environment provided by the caller
1361 * \param[in] d OSP device
1363 * \retval 0 on success
1364 * \retval negative negated errno on error
1366 static int osp_sync_llog_init(const struct lu_env *env, struct osp_device *d)
1368 struct osp_thread_info *osi = osp_env_info(env);
1369 struct lu_fid *fid = &osi->osi_fid;
1370 struct llog_handle *lgh = NULL;
1371 struct obd_device *obd = d->opd_obd;
1372 struct llog_ctxt *ctxt;
1380 * open llog corresponding to our OST
1382 OBD_SET_CTXT_MAGIC(&obd->obd_lvfs_ctxt);
1383 obd->obd_lvfs_ctxt.dt = d->opd_storage;
1385 lu_local_obj_fid(fid, LLOG_CATALOGS_OID);
1387 rc = llog_osd_get_cat_list(env, d->opd_storage, d->opd_index, 1,
1388 &osi->osi_cid, fid);
1390 if (rc != -EFAULT) {
1391 CERROR("%s: can't get id from catalogs: rc = %d\n",
1396 /* After sparse OST indices is supported, the CATALOG file
1397 * may become a sparse file that results in failure on
1398 * reading. Skip this error as the llog will be created
1400 memset(&osi->osi_cid, 0, sizeof(osi->osi_cid));
1404 CDEBUG(D_INFO, "%s: Init llog for %d - catid "DFID":%x\n",
1405 obd->obd_name, d->opd_index,
1406 PFID(&osi->osi_cid.lci_logid.lgl_oi.oi_fid),
1407 osi->osi_cid.lci_logid.lgl_ogen);
1409 rc = llog_setup(env, obd, &obd->obd_olg, LLOG_MDS_OST_ORIG_CTXT,
1410 d->opd_storage->dd_lu_dev.ld_obd,
1411 &llog_common_cat_ops);
1415 ctxt = llog_get_context(obd, LLOG_MDS_OST_ORIG_CTXT);
1418 if (likely(logid_id(&osi->osi_cid.lci_logid) != 0)) {
1419 struct lu_fid fid_temp;
1421 if (CFS_FAIL_CHECK(OBD_FAIL_OSP_INVALID_LOGID)) {
1422 memset(&osi->osi_cid, 0, sizeof(osi->osi_cid));
1423 logid_set_id(&osi->osi_cid.lci_logid, cfs_fail_val);
1426 logid_to_fid(&osi->osi_cid.lci_logid, &fid_temp);
1427 if (fid_is_sane(&fid_temp)) {
1428 rc = llog_open(env, ctxt, &lgh, &osi->osi_cid.lci_logid,
1429 NULL, LLOG_OPEN_EXISTS);
1431 /* re-create llog if it is missing */
1433 logid_set_id(&osi->osi_cid.lci_logid, 0);
1435 GOTO(out_cleanup, rc);
1437 CERROR("%s: the catid "DFID" for init llog %d is bad\n",
1438 obd->obd_name, PFID(&fid_temp), d->opd_index);
1440 /* it will be recreated later */
1441 logid_set_id(&osi->osi_cid.lci_logid, 0);
1445 if (unlikely(logid_id(&osi->osi_cid.lci_logid) == 0)) {
1446 rc = llog_open_create(env, ctxt, &lgh, NULL, NULL);
1448 GOTO(out_cleanup, rc);
1449 osi->osi_cid.lci_logid = lgh->lgh_id;
1452 LASSERT(lgh != NULL);
1453 ctxt->loc_handle = lgh;
1455 rc = llog_init_handle(env, lgh, LLOG_F_IS_CAT | LLOG_F_RM_ON_ERR, NULL);
1457 GOTO(out_close, rc);
1459 rc = llog_osd_put_cat_list(env, d->opd_storage, d->opd_index, 1,
1460 &osi->osi_cid, fid);
1462 GOTO(out_close, rc);
1465 * put a mark in the llog till which we'll be processing
1466 * old records restless
1468 d->opd_sync_generation.mnt_cnt = ktime_get_ns();
1469 d->opd_sync_generation.conn_cnt = ktime_get_ns();
1471 osi->osi_hdr.lrh_type = LLOG_GEN_REC;
1472 osi->osi_hdr.lrh_len = sizeof(osi->osi_gen);
1474 memcpy(&osi->osi_gen.lgr_gen, &d->opd_sync_generation,
1475 sizeof(osi->osi_gen.lgr_gen));
1477 rc = llog_cat_add(env, lgh, &osi->osi_gen.lgr_hdr, &osi->osi_cookie);
1479 GOTO(out_close, rc);
1480 llog_ctxt_put(ctxt);
1483 llog_cat_close(env, lgh);
1485 llog_cleanup(env, ctxt);
1490 * Cleanup llog used for syncing.
1492 * Closes and cleanups the llog. The function is called when the device is
1495 * \param[in] env LU environment provided by the caller
1496 * \param[in] d OSP device
1498 static void osp_sync_llog_fini(const struct lu_env *env, struct osp_device *d)
1500 struct llog_ctxt *ctxt;
1502 ctxt = llog_get_context(d->opd_obd, LLOG_MDS_OST_ORIG_CTXT);
1504 llog_cat_close(env, ctxt->loc_handle);
1505 llog_cleanup(env, ctxt);
1510 * Initialization of the sync component of OSP.
1512 * Initializes the llog and starts a new thread to handle the changes to
1513 * the remote target (OST or MDT).
1515 * \param[in] env LU environment provided by the caller
1516 * \param[in] d OSP device
1518 * \retval 0 on success
1519 * \retval negative negated errno on error
1521 int osp_sync_init(const struct lu_env *env, struct osp_device *d)
1523 struct task_struct *task;
1524 struct osp_sync_args *args;
1525 DECLARE_COMPLETION_ONSTACK(started);
1530 d->opd_sync_max_rpcs_in_flight = OSP_MAX_RPCS_IN_FLIGHT;
1531 d->opd_sync_max_rpcs_in_progress = OSP_MAX_RPCS_IN_PROGRESS;
1532 d->opd_sync_max_changes = OSP_MAX_SYNC_CHANGES;
1533 spin_lock_init(&d->opd_sync_lock);
1534 init_waitqueue_head(&d->opd_sync_waitq);
1535 init_waitqueue_head(&d->opd_sync_barrier_waitq);
1536 INIT_LIST_HEAD(&d->opd_sync_in_flight_list);
1537 INIT_LIST_HEAD(&d->opd_sync_committed_there);
1539 if (d->opd_storage->dd_rdonly)
1542 OBD_ALLOC_PTR(args);
1544 GOTO(err_id, rc = -ENOMEM);
1546 args->osa_started = &started;
1548 * initialize llog storing changes
1550 rc = osp_sync_llog_init(env, d);
1552 CERROR("%s: can't initialize llog: rc = %d\n",
1553 d->opd_obd->obd_name, rc);
1557 rc = lu_env_init(&args->osa_env, LCT_LOCAL);
1559 CERROR("%s: can't initialize env: rc = %d\n",
1560 d->opd_obd->obd_name, rc);
1565 * Start synchronization thread
1567 task = kthread_create(osp_sync_thread, args, "osp-syn-%u-%u",
1568 d->opd_index, d->opd_group);
1571 CERROR("%s: cannot start sync thread: rc = %d\n",
1572 d->opd_obd->obd_name, rc);
1573 lu_env_fini(&args->osa_env);
1576 d->opd_sync_task = task;
1577 wake_up_process(task);
1578 wait_for_completion(&started);
1582 osp_sync_llog_fini(env, d);
1590 * Stop the syncing thread.
1592 * Asks the syncing thread to stop and wait until it's stopped.
1594 * \param[in] d OSP device
1598 int osp_sync_fini(struct osp_device *d)
1600 struct task_struct *task;
1604 task = xchg(&d->opd_sync_task, NULL);
1611 struct osp_last_committed_cb {
1612 struct dt_txn_commit_cb ospc_cb;
1613 struct osp_device *ospc_dev;
1617 void osp_sync_local_commit_cb(struct lu_env *env, struct thandle *th,
1618 struct dt_txn_commit_cb *dcb, int err)
1620 struct osp_last_committed_cb *cb;
1621 struct osp_device *d;
1623 cb = container_of(dcb, struct osp_last_committed_cb, ospc_cb);
1626 CDEBUG(D_HA, "%s: %llu committed\n", d->opd_obd->obd_name,
1629 spin_lock(&d->opd_sync_lock);
1630 if (cb->ospc_transno > d->opd_sync_last_committed_id)
1631 d->opd_sync_last_committed_id = cb->ospc_transno;
1632 spin_unlock(&d->opd_sync_lock);
1634 osp_sync_check_for_work(d);
1635 lu_device_put(osp2lu_dev(d));
1636 if (atomic_dec_and_test(&d->opd_commits_registered))
1637 wake_up(&d->opd_sync_waitq);
1642 static int osp_sync_add_commit_cb(const struct lu_env *env,
1643 struct osp_device *d, struct thandle *th)
1645 struct osp_last_committed_cb *cb;
1646 struct dt_txn_commit_cb *dcb;
1654 dcb->dcb_func = osp_sync_local_commit_cb;
1655 spin_lock(&d->opd_sync_lock);
1656 cb->ospc_transno = ++d->opd_sync_last_used_id;
1657 spin_unlock(&d->opd_sync_lock);
1659 rc = dt_trans_cb_add(th, dcb);
1660 CDEBUG(D_HA, "%s: add commit cb at %lluns, next at %lluns, rc = %d\n",
1661 d->opd_obd->obd_name, ktime_get_ns(),
1662 ktime_to_ns(d->opd_sync_next_commit_cb), rc);
1664 if (likely(rc == 0)) {
1665 lu_device_get(osp2lu_dev(d));
1666 atomic_inc(&d->opd_commits_registered);
1673 /* add the commit callback every second */
1674 int osp_sync_add_commit_cb_1s(const struct lu_env *env, struct osp_device *d,
1677 ktime_t now = ktime_get();
1681 if (ktime_before(now, d->opd_sync_next_commit_cb))
1684 spin_lock(&d->opd_sync_lock);
1685 if (ktime_before(d->opd_sync_next_commit_cb, now)) {
1687 d->opd_sync_next_commit_cb = ktime_add_ns(now, NSEC_PER_SEC);
1689 spin_unlock(&d->opd_sync_lock);
1694 return osp_sync_add_commit_cb(env, d, th);
1698 * generate an empty transaction and hook the commit callback in
1699 * then force transaction commit
1701 void osp_sync_force(const struct lu_env *env, struct osp_device *d)
1706 th = dt_trans_create(env, d->opd_storage);
1708 CERROR("%s: can't sync\n", d->opd_obd->obd_name);
1711 rc = dt_trans_start_local(env, d->opd_storage, th);
1713 CDEBUG(D_OTHER, "%s: sync forced, %d changes\n",
1714 d->opd_obd->obd_name,
1715 atomic_read(&d->opd_sync_changes));
1716 rc = osp_sync_add_commit_cb(env, d, th);
1717 dt_trans_stop(env, d->opd_storage, th);
1720 dt_commit_async(env, d->opd_storage);