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) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
31 * lustre/mgs/mgs_nids.c
33 * NID table management for lustre.
35 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
38 #define DEBUG_SUBSYSTEM S_MGS
39 #define D_MGS D_CONFIG
41 #include <linux/kthread.h>
42 #include <linux/pagemap.h>
45 #include <obd_class.h>
46 #include <lustre_disk.h>
48 #include "mgs_internal.h"
50 static time64_t ir_timeout;
52 static int nidtbl_is_sane(struct mgs_nidtbl *tbl)
54 struct mgs_nidtbl_target *tgt;
57 LASSERT(mutex_is_locked(&tbl->mn_lock));
58 list_for_each_entry(tgt, &tbl->mn_targets, mnt_list) {
59 if (!tgt->mnt_version)
62 if (version >= tgt->mnt_version)
65 version = tgt->mnt_version;
71 * Fetch nidtbl entries whose version are not less than @version
72 * nidtbl entries will be packed in @pages by @unit_size units - entries
73 * shouldn't cross unit boundaries.
75 static int mgs_nidtbl_read(struct obd_export *exp, struct mgs_nidtbl *tbl,
76 struct mgs_config_res *res, struct page **pages,
77 int nrpages, int units_total, int unit_size)
79 struct mgs_nidtbl_target *tgt;
80 struct mgs_nidtbl_entry *entry;
81 struct mgs_nidtbl_entry *last_in_unit = NULL;
82 struct mgs_target_info *mti;
83 __u64 version = res->mcr_offset;
86 int bytes_in_unit = 0;
87 int units_in_page = 0;
93 /* make sure unit_size is power 2 */
94 LASSERT((unit_size & (unit_size - 1)) == 0);
95 LASSERT(nrpages << PAGE_SHIFT >= units_total * unit_size);
97 mutex_lock(&tbl->mn_lock);
98 LASSERT(nidtbl_is_sane(tbl));
100 /* no more entries ? */
101 if (version > tbl->mn_version) {
102 version = tbl->mn_version;
107 * iterate over all targets to compose a bitmap by the type of llog.
108 * If the llog is for MDTs, llog entries for OSTs will be returned;
109 * otherwise, it's for clients, then llog entries for both OSTs and
110 * MDTs will be returned.
112 list_for_each_entry(tgt, &tbl->mn_targets, mnt_list) {
113 int entry_len = sizeof(*entry);
115 if (tgt->mnt_version < version)
118 /* write target recover information */
120 LASSERT(mti->mti_nid_count < MTI_NIDS_MAX);
121 entry_len += mti->mti_nid_count * sizeof(lnet_nid_t);
123 if (entry_len > unit_size) {
124 CWARN("nidtbl: too large entry: entry length %d, unit size: %d\n",
125 entry_len, unit_size);
126 GOTO(out, rc = -EOVERFLOW);
129 if (bytes_in_unit < entry_len) {
130 if (units_total == 0) {
135 /* check if we need to consume remaining bytes. */
136 if (last_in_unit && bytes_in_unit) {
137 last_in_unit->mne_length += bytes_in_unit;
139 buf += bytes_in_unit;
142 LASSERT((rc & (unit_size - 1)) == 0);
144 if (units_in_page == 0) {
145 /* allocate a new page */
146 pages[index] = alloc_page(GFP_KERNEL);
152 /* destroy previous map */
154 kunmap(pages[index - 1]);
156 /* reassign buffer */
157 buf = kmap(pages[index]);
160 units_in_page = PAGE_SIZE / unit_size;
161 LASSERT(units_in_page > 0);
164 /* allocate an unit */
165 LASSERT(((long)buf & (unit_size - 1)) == 0);
166 bytes_in_unit = unit_size;
172 entry = (struct mgs_nidtbl_entry *)buf;
173 entry->mne_version = tgt->mnt_version;
174 entry->mne_instance = mti->mti_instance;
175 entry->mne_index = mti->mti_stripe_index;
176 entry->mne_length = entry_len;
177 entry->mne_type = tgt->mnt_type;
178 entry->mne_nid_type = 0;
179 entry->mne_nid_size = sizeof(lnet_nid_t);
180 entry->mne_nid_count = mti->mti_nid_count;
181 memcpy(entry->u.nids, mti->mti_nids,
182 mti->mti_nid_count * sizeof(lnet_nid_t));
184 version = tgt->mnt_version;
188 bytes_in_unit -= entry_len;
189 last_in_unit = entry;
191 CDEBUG(D_MGS, "fsname %s, entry size %d, pages %d/%d/%d/%d.\n",
192 tbl->mn_fsdb->fsdb_name, entry_len,
193 bytes_in_unit, index, nrpages, units_total);
196 kunmap(pages[index - 1]);
198 LASSERT(version <= tbl->mn_version);
199 res->mcr_size = tbl->mn_version;
200 res->mcr_offset = nobuf ? version : tbl->mn_version;
201 mutex_unlock(&tbl->mn_lock);
202 LASSERT(ergo(version == 1, rc == 0)); /* get the log first time */
204 CDEBUG(D_MGS, "Read IR logs %s return with %d, version %llu\n",
205 tbl->mn_fsdb->fsdb_name, rc, version);
209 static int nidtbl_update_version(const struct lu_env *env,
210 struct mgs_device *mgs,
211 struct mgs_nidtbl *tbl)
213 struct dt_object *fsdb;
216 struct lu_buf buf = {
218 .lb_len = sizeof(version)
225 if (mgs->mgs_bottom->dd_rdonly)
228 LASSERT(mutex_is_locked(&tbl->mn_lock));
230 fsdb = local_file_find_or_create(env, mgs->mgs_los, mgs->mgs_nidtbl_dir,
231 tbl->mn_fsdb->fsdb_name,
232 S_IFREG | S_IRUGO | S_IWUSR);
234 RETURN(PTR_ERR(fsdb));
236 th = dt_trans_create(env, mgs->mgs_bottom);
238 GOTO(out_put, rc = PTR_ERR(th));
240 th->th_sync = 1; /* update table synchronously */
241 rc = dt_declare_record_write(env, fsdb, &buf, off, th);
245 rc = dt_trans_start_local(env, mgs->mgs_bottom, th);
249 version = cpu_to_le64(tbl->mn_version);
250 rc = dt_record_write(env, fsdb, &buf, &off, th);
253 dt_trans_stop(env, mgs->mgs_bottom, th);
255 dt_object_put(env, fsdb);
259 #define MGS_NIDTBL_VERSION_INIT 2
261 static int nidtbl_read_version(const struct lu_env *env,
262 struct mgs_device *mgs, struct mgs_nidtbl *tbl,
265 struct dt_object *fsdb;
268 struct lu_buf buf = {
270 .lb_len = sizeof(tmpver)
277 LASSERT(mutex_is_locked(&tbl->mn_lock));
279 LASSERT(mgs->mgs_nidtbl_dir);
280 rc = dt_lookup_dir(env, mgs->mgs_nidtbl_dir, tbl->mn_fsdb->fsdb_name,
283 *version = MGS_NIDTBL_VERSION_INIT;
289 fsdb = dt_locate_at(env, mgs->mgs_bottom, &fid,
290 &mgs->mgs_dt_dev.dd_lu_dev, NULL);
292 RETURN(PTR_ERR(fsdb));
294 rc = dt_read(env, fsdb, &buf, &off);
295 if (rc == buf.lb_len) {
296 *version = le64_to_cpu(tmpver);
298 } else if (rc == 0) {
299 *version = MGS_NIDTBL_VERSION_INIT;
301 CERROR("%s: read version file %s error %d\n",
302 mgs->mgs_obd->obd_name, tbl->mn_fsdb->fsdb_name, rc);
304 dt_object_put(env, fsdb);
308 static int mgs_nidtbl_write(const struct lu_env *env, struct fs_db *fsdb,
309 struct mgs_target_info *mti)
311 struct mgs_nidtbl *tbl;
312 struct mgs_nidtbl_target *tgt;
314 int type = mti->mti_flags & LDD_F_SV_TYPE_MASK;
319 type &= ~LDD_F_SV_TYPE_MGS;
322 tbl = &fsdb->fsdb_nidtbl;
323 mutex_lock(&tbl->mn_lock);
324 list_for_each_entry(tgt, &tbl->mn_targets, mnt_list) {
325 struct mgs_target_info *info = &tgt->mnt_mti;
327 if (type == tgt->mnt_type &&
328 mti->mti_stripe_index == info->mti_stripe_index) {
336 GOTO(out, rc = -ENOMEM);
338 INIT_LIST_HEAD(&tgt->mnt_list);
340 tgt->mnt_version = 0; /* 0 means invalid */
341 tgt->mnt_type = type;
343 ++tbl->mn_nr_targets;
346 tgt->mnt_version = ++tbl->mn_version;
349 list_move_tail(&tgt->mnt_list, &tbl->mn_targets);
351 rc = nidtbl_update_version(env, fsdb->fsdb_mgs, tbl);
355 mutex_unlock(&tbl->mn_lock);
357 CERROR("Write NID table version for file system %s error %d\n",
358 fsdb->fsdb_name, rc);
362 static void mgs_nidtbl_fini_fs(struct fs_db *fsdb)
364 struct mgs_nidtbl *tbl = &fsdb->fsdb_nidtbl;
367 mutex_lock(&tbl->mn_lock);
368 tbl->mn_nr_targets = 0;
369 list_splice_init(&tbl->mn_targets, &head);
370 mutex_unlock(&tbl->mn_lock);
372 while (!list_empty(&head)) {
373 struct mgs_nidtbl_target *tgt;
375 tgt = list_entry(head.next, struct mgs_nidtbl_target, mnt_list);
376 list_del(&tgt->mnt_list);
381 static int mgs_nidtbl_init_fs(const struct lu_env *env, struct fs_db *fsdb)
383 struct mgs_nidtbl *tbl = &fsdb->fsdb_nidtbl;
386 INIT_LIST_HEAD(&tbl->mn_targets);
387 mutex_init(&tbl->mn_lock);
388 tbl->mn_nr_targets = 0;
390 mutex_lock(&tbl->mn_lock);
391 rc = nidtbl_read_version(env, fsdb->fsdb_mgs, tbl, &tbl->mn_version);
392 mutex_unlock(&tbl->mn_lock);
394 CERROR("%s: IR: failed to read current version, rc = %d\n",
395 fsdb->fsdb_mgs->mgs_obd->obd_name, rc);
397 CDEBUG(D_MGS, "IR: current version is %llu\n",
403 /* --------- Imperative Recovery relies on nidtbl stuff ------- */
404 void mgs_ir_notify_complete(struct fs_db *fsdb)
406 struct timespec64 ts;
409 atomic_set(&fsdb->fsdb_notify_phase, 0);
412 fsdb->fsdb_notify_count++;
413 delta = ktime_sub(ktime_get(), fsdb->fsdb_notify_start);
414 fsdb->fsdb_notify_total = ktime_add(fsdb->fsdb_notify_total, delta);
415 if (ktime_after(delta, fsdb->fsdb_notify_max))
416 fsdb->fsdb_notify_max = delta;
418 ts = ktime_to_timespec64(fsdb->fsdb_notify_max);
419 CDEBUG(D_MGS, "Revoke recover lock of %s completed after %lld.%09lds\n",
420 fsdb->fsdb_name, (s64)ts.tv_sec, ts.tv_nsec);
423 static int mgs_ir_notify(void *arg)
425 struct fs_db *fsdb = arg;
426 struct ldlm_res_id resid;
427 char name[sizeof(fsdb->fsdb_name) + 16];
429 BUILD_BUG_ON(sizeof(name) >= 40); /* name is too large to be on stack */
431 snprintf(name, sizeof(name) - 1, "mgs_%s_notify", fsdb->fsdb_name);
432 complete(&fsdb->fsdb_notify_comp);
433 set_user_nice(current, -2);
434 mgc_fsname2resid(fsdb->fsdb_name, &resid, MGS_CFG_T_RECOVER);
436 wait_event_idle(fsdb->fsdb_notify_waitq,
437 fsdb->fsdb_notify_stop ||
438 atomic_read(&fsdb->fsdb_notify_phase));
440 if (fsdb->fsdb_notify_stop)
443 CDEBUG(D_MGS, "%s woken up, phase is %d\n",
444 name, atomic_read(&fsdb->fsdb_notify_phase));
446 fsdb->fsdb_notify_start = ktime_get();
447 mgs_revoke_lock(fsdb->fsdb_mgs, fsdb, MGS_CFG_T_RECOVER);
450 complete(&fsdb->fsdb_notify_comp);
454 int mgs_ir_init_fs(const struct lu_env *env, struct mgs_device *mgs,
457 struct task_struct *task;
460 ir_timeout = (time64_t)OBD_IR_MGS_TIMEOUT;
462 fsdb->fsdb_ir_state = IR_FULL;
463 if (mgs->mgs_start_time + ir_timeout > ktime_get_real_seconds())
464 fsdb->fsdb_ir_state = IR_STARTUP;
465 fsdb->fsdb_nonir_clients = 0;
466 /* start notify thread */
467 fsdb->fsdb_mgs = mgs;
468 task = kthread_run(mgs_ir_notify, fsdb,
469 "mgs_%s_notify", fsdb->fsdb_name);
471 wait_for_completion(&fsdb->fsdb_notify_comp);
473 CERROR("Start notify thread error %ld\n", PTR_ERR(task));
475 mgs_nidtbl_init_fs(env, fsdb);
479 void mgs_ir_fini_fs(struct mgs_device *mgs, struct fs_db *fsdb)
481 if (test_bit(FSDB_MGS_SELF, &fsdb->fsdb_flags))
484 mgs_fsc_cleanup_by_fsdb(fsdb);
486 mgs_nidtbl_fini_fs(fsdb);
488 LASSERT(list_empty(&fsdb->fsdb_clients));
490 fsdb->fsdb_notify_stop = 1;
491 wake_up(&fsdb->fsdb_notify_waitq);
492 wait_for_completion(&fsdb->fsdb_notify_comp);
495 /* caller must have held fsdb_mutex */
496 static inline void ir_state_graduate(struct fs_db *fsdb)
498 if (fsdb->fsdb_ir_state == IR_STARTUP) {
499 if (ktime_get_real_seconds() >
500 fsdb->fsdb_mgs->mgs_start_time + ir_timeout) {
501 fsdb->fsdb_ir_state = IR_FULL;
502 if (fsdb->fsdb_nonir_clients)
503 fsdb->fsdb_ir_state = IR_PARTIAL;
508 int mgs_ir_update(const struct lu_env *env, struct mgs_device *mgs,
509 struct mgs_target_info *mti)
515 if (mti->mti_instance == 0)
518 rc = mgs_find_or_make_fsdb(env, mgs, mti->mti_fsname, &fsdb);
522 rc = mgs_nidtbl_write(env, fsdb, mti);
527 mutex_lock(&fsdb->fsdb_mutex);
528 ir_state_graduate(fsdb);
529 switch (fsdb->fsdb_ir_state) {
531 mti->mti_flags |= LDD_F_IR_CAPABLE;
541 mutex_unlock(&fsdb->fsdb_mutex);
543 LASSERT(ergo(mti->mti_flags & LDD_F_IR_CAPABLE, notify));
545 CDEBUG(D_MGS, "Try to revoke recover lock of %s\n",
547 atomic_inc(&fsdb->fsdb_notify_phase);
548 wake_up(&fsdb->fsdb_notify_waitq);
552 mgs_put_fsdb(mgs, fsdb);
556 /* NID table can be cached by two entities: Clients and MDTs */
562 static int delogname(char *logname, char *fsname, int *typ)
568 ptr = strrchr(logname, '-');
573 * decouple file system name. The llog name may be:
574 * - "prefix-fsname", prefix is "cliir" or "mdtir"
576 if (strncmp(ptr, "-mdtir", 6) == 0)
578 else if (strncmp(ptr, "-cliir", 6) == 0)
587 memcpy(fsname, logname, len);
594 int mgs_get_ir_logs(struct ptlrpc_request *req)
596 struct lu_env *env = req->rq_svc_thread->t_env;
597 struct mgs_device *mgs = exp2mgs_dev(req->rq_export);
598 struct fs_db *fsdb = NULL;
599 struct mgs_config_body *body;
600 struct mgs_config_res *res;
601 struct ptlrpc_bulk_desc *desc;
611 struct page **pages = NULL;
615 body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
619 if (body->mcb_type != MGS_CFG_T_RECOVER)
622 rc = delogname(body->mcb_name, fsname, &type);
626 bufsize = body->mcb_units << body->mcb_bits;
627 nrpages = (bufsize + PAGE_SIZE - 1) >> PAGE_SHIFT;
628 if (nrpages > PTLRPC_MAX_BRW_PAGES)
631 rc = mgs_find_or_make_fsdb(env, mgs, fsname, &fsdb);
635 CDEBUG(D_MGS, "Reading IR log %s bufsize %ld.\n",
636 body->mcb_name, bufsize);
638 OBD_ALLOC_PTR_ARRAY_LARGE(pages, nrpages);
640 GOTO(out, rc = -ENOMEM);
642 res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
644 GOTO(out, rc = -EINVAL);
646 res->mcr_offset = body->mcb_offset;
647 unit_size = min_t(int, 1 << body->mcb_bits, PAGE_SIZE);
648 bytes = mgs_nidtbl_read(req->rq_export, &fsdb->fsdb_nidtbl, res,
649 pages, nrpages, bufsize / unit_size, unit_size);
651 GOTO(out, rc = bytes);
653 /* start bulk transfer */
654 page_count = (bytes + PAGE_SIZE - 1) >> PAGE_SHIFT;
655 LASSERT(page_count <= nrpages);
656 desc = ptlrpc_prep_bulk_exp(req, page_count, 1,
657 PTLRPC_BULK_PUT_SOURCE,
659 &ptlrpc_bulk_kiov_pin_ops);
661 GOTO(out, rc = -ENOMEM);
663 for (i = 0; i < page_count && bytes > 0; i++) {
664 desc->bd_frag_ops->add_kiov_frag(desc, pages[i], 0,
670 rc = target_bulk_io(req->rq_export, desc);
671 ptlrpc_free_bulk(desc);
677 for (i = 0; i < nrpages; i++) {
681 __free_page(pages[i]);
684 OBD_FREE_PTR_ARRAY_LARGE(pages, nrpages);
688 mgs_put_fsdb(mgs, fsdb);
693 static int lprocfs_ir_set_state(struct fs_db *fsdb, const char *buf)
695 const char *const strings[] = IR_STRINGS;
699 for (i = 0; i < ARRAY_SIZE(strings); i++) {
700 if (strcmp(strings[i], buf) == 0) {
708 CDEBUG(D_MGS, "change fsr state of %s from %s to %s\n",
709 fsdb->fsdb_name, strings[fsdb->fsdb_ir_state], strings[state]);
710 mutex_lock(&fsdb->fsdb_mutex);
711 if (state == IR_FULL && fsdb->fsdb_nonir_clients)
713 fsdb->fsdb_ir_state = state;
714 mutex_unlock(&fsdb->fsdb_mutex);
719 static int lprocfs_ir_set_timeout(struct fs_db *fsdb, const char *buf)
724 static int lprocfs_ir_clear_stats(struct fs_db *fsdb, const char *buf)
729 fsdb->fsdb_notify_total = ktime_set(0, 0);
730 fsdb->fsdb_notify_max = ktime_set(0, 0);
731 fsdb->fsdb_notify_count = 0;
735 static struct lproc_ir_cmd {
738 int (*handler)(struct fs_db *, const char *);
740 { "state=", 6, lprocfs_ir_set_state },
741 { "timeout=", 8, lprocfs_ir_set_timeout },
742 { "0", 1, lprocfs_ir_clear_stats }
745 int lprocfs_wr_ir_state(struct file *file, const char __user *buffer,
746 size_t count, void *data)
748 struct fs_db *fsdb = data;
753 if (count == 0 || count >= PAGE_SIZE)
756 OBD_ALLOC(kbuf, count + 1);
760 if (copy_from_user(kbuf, buffer, count)) {
761 OBD_FREE(kbuf, count + 1);
765 kbuf[count] = 0; /* buffer is supposed to end with 0 */
766 if (kbuf[count - 1] == '\n')
770 /* fsname=<file system name> must be the 1st entry */
775 tmpptr = strchr(ptr, ';');
780 for (i = 0; i < ARRAY_SIZE(ir_cmds); i++) {
781 struct lproc_ir_cmd *cmd;
785 cmdlen = cmd->namelen;
786 if (strncmp(cmd->name, ptr, cmdlen) == 0) {
788 rc = cmd->handler(fsdb, ptr);
798 CERROR("Unable to process command: %s(%d)\n", ptr, rc);
799 OBD_FREE(kbuf, count + 1);
803 int lprocfs_rd_ir_state(struct seq_file *seq, void *data)
805 struct fs_db *fsdb = data;
806 struct mgs_nidtbl *tbl = &fsdb->fsdb_nidtbl;
807 const char *const ir_strings[] = IR_STRINGS;
808 struct timespec64 ts_max;
809 struct timespec64 ts;
811 /* mgs_live_seq_show() already holds fsdb_mutex. */
812 ir_state_graduate(fsdb);
814 seq_printf(seq, "\nimperative_recovery_state:\n");
817 " nonir_clients: %d\n"
818 " nidtbl_version: %lld\n",
819 ir_strings[fsdb->fsdb_ir_state], fsdb->fsdb_nonir_clients,
822 ts = ktime_to_timespec64(fsdb->fsdb_notify_total);
823 ts_max = ktime_to_timespec64(fsdb->fsdb_notify_max);
825 seq_printf(seq, " notify_duration_total: %lld.%09ld\n"
826 " notify_duation_max: %lld.%09ld\n"
827 " notify_count: %u\n",
828 (s64)ts.tv_sec, ts.tv_nsec,
829 (s64)ts_max.tv_sec, ts_max.tv_nsec,
830 fsdb->fsdb_notify_count);
835 int lprocfs_ir_timeout_seq_show(struct seq_file *m, void *data)
837 seq_printf(m, "%lld\n", ir_timeout);
841 ssize_t lprocfs_ir_timeout_seq_write(struct file *file,
842 const char __user *buffer,
843 size_t count, loff_t *off)
845 return kstrtoll_from_user(buffer, count, 0, &ir_timeout);
848 /* --------------- Handle non IR support clients --------------- */
849 /* attach a lustre file system to an export */
850 int mgs_fsc_attach(const struct lu_env *env, struct obd_export *exp,
853 struct mgs_export_data *data = &exp->u.eu_mgs_data;
854 struct mgs_device *mgs = exp2mgs_dev(exp);
855 struct fs_db *fsdb = NULL;
856 struct mgs_fsc *fsc = NULL;
857 struct mgs_fsc *new_fsc = NULL;
863 rc = mgs_find_or_make_fsdb(env, mgs, fsname, &fsdb);
867 /* allocate a new fsc in case we need it in spinlock. */
868 OBD_ALLOC_PTR(new_fsc);
870 GOTO(out, rc = -ENOMEM);
872 INIT_LIST_HEAD(&new_fsc->mfc_export_list);
873 INIT_LIST_HEAD(&new_fsc->mfc_fsdb_list);
874 new_fsc->mfc_fsdb = fsdb;
875 new_fsc->mfc_export = class_export_get(exp);
876 new_fsc->mfc_ir_capable = !!(exp_connect_flags(exp) &
877 OBD_CONNECT_IMP_RECOV);
880 mutex_lock(&fsdb->fsdb_mutex);
882 /* tend to find it in export list because this list is shorter. */
883 spin_lock(&data->med_lock);
884 list_for_each_entry(fsc, &data->med_clients, mfc_export_list) {
885 if (strcmp(fsname, fsc->mfc_fsdb->fsdb_name) == 0) {
894 /* add it into export list. */
895 list_add(&fsc->mfc_export_list, &data->med_clients);
897 /* add into fsdb list. */
898 list_add(&fsc->mfc_fsdb_list, &fsdb->fsdb_clients);
899 if (!fsc->mfc_ir_capable) {
900 ++fsdb->fsdb_nonir_clients;
901 if (fsdb->fsdb_ir_state == IR_FULL)
902 fsdb->fsdb_ir_state = IR_PARTIAL;
906 spin_unlock(&data->med_lock);
907 mutex_unlock(&fsdb->fsdb_mutex);
910 class_export_put(new_fsc->mfc_export);
911 OBD_FREE_PTR(new_fsc);
915 mgs_put_fsdb(mgs, fsdb);
919 void mgs_fsc_cleanup(struct obd_export *exp)
921 struct mgs_export_data *data = &exp->u.eu_mgs_data;
922 struct mgs_fsc *fsc, *tmp;
925 spin_lock(&data->med_lock);
926 list_splice_init(&data->med_clients, &head);
927 spin_unlock(&data->med_lock);
929 list_for_each_entry_safe(fsc, tmp, &head, mfc_export_list) {
930 struct fs_db *fsdb = fsc->mfc_fsdb;
932 LASSERT(fsc->mfc_export == exp);
934 mutex_lock(&fsdb->fsdb_mutex);
935 list_del_init(&fsc->mfc_fsdb_list);
936 if (fsc->mfc_ir_capable == 0) {
937 --fsdb->fsdb_nonir_clients;
938 LASSERT(fsdb->fsdb_ir_state != IR_FULL);
939 if (fsdb->fsdb_nonir_clients == 0 &&
940 fsdb->fsdb_ir_state == IR_PARTIAL)
941 fsdb->fsdb_ir_state = IR_FULL;
943 mutex_unlock(&fsdb->fsdb_mutex);
944 list_del_init(&fsc->mfc_export_list);
945 class_export_put(fsc->mfc_export);
950 /* must be called with fsdb->fsdb_mutex held */
951 void mgs_fsc_cleanup_by_fsdb(struct fs_db *fsdb)
953 struct mgs_fsc *fsc, *tmp;
955 list_for_each_entry_safe(fsc, tmp, &fsdb->fsdb_clients,
957 struct mgs_export_data *data = &fsc->mfc_export->u.eu_mgs_data;
959 LASSERT(fsdb == fsc->mfc_fsdb);
960 list_del_init(&fsc->mfc_fsdb_list);
962 spin_lock(&data->med_lock);
963 list_del_init(&fsc->mfc_export_list);
964 spin_unlock(&data->med_lock);
965 class_export_put(fsc->mfc_export);
969 fsdb->fsdb_nonir_clients = 0;
970 if (fsdb->fsdb_ir_state == IR_PARTIAL)
971 fsdb->fsdb_ir_state = IR_FULL;