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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
30 * Copyright (c) 2011, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/mgs/mgs_nids.c
38 * NID table management for lustre.
40 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
43 #define DEBUG_SUBSYSTEM S_MGS
44 #define D_MGS D_CONFIG
47 #include <linux/pagemap.h>
51 #include <obd_class.h>
52 #include <lustre_disk.h>
54 #include "mgs_internal.h"
56 static unsigned int ir_timeout;
58 static int nidtbl_is_sane(struct mgs_nidtbl *tbl)
60 struct mgs_nidtbl_target *tgt;
63 LASSERT(mutex_is_locked(&tbl->mn_lock));
64 cfs_list_for_each_entry(tgt, &tbl->mn_targets, mnt_list) {
65 if (!tgt->mnt_version)
68 if (version >= tgt->mnt_version)
71 version = tgt->mnt_version;
77 * Fetch nidtbl entries whose version are not less than @version
78 * nidtbl entries will be packed in @pages by @unit_size units - entries
79 * shouldn't cross unit boundaries.
81 static int mgs_nidtbl_read(struct obd_export *exp, struct mgs_nidtbl *tbl,
82 struct mgs_config_res *res, struct page **pages,
83 int nrpages, int units_total, int unit_size)
85 struct mgs_nidtbl_target *tgt;
86 struct mgs_nidtbl_entry *entry;
87 struct mgs_nidtbl_entry *last_in_unit = NULL;
88 struct mgs_target_info *mti;
89 __u64 version = res->mcr_offset;
92 int bytes_in_unit = 0;
93 int units_in_page = 0;
98 /* make sure unit_size is power 2 */
99 LASSERT((unit_size & (unit_size - 1)) == 0);
100 LASSERT(nrpages << PAGE_CACHE_SHIFT >= units_total * unit_size);
102 mutex_lock(&tbl->mn_lock);
103 LASSERT(nidtbl_is_sane(tbl));
105 /* no more entries ? */
106 if (version > tbl->mn_version) {
107 version = tbl->mn_version;
111 /* iterate over all targets to compose a bitmap by the type of llog.
112 * If the llog is for MDTs, llog entries for OSTs will be returned;
113 * otherwise, it's for clients, then llog entries for both OSTs and
114 * MDTs will be returned.
116 cfs_list_for_each_entry(tgt, &tbl->mn_targets, mnt_list) {
117 int entry_len = sizeof(*entry);
119 if (tgt->mnt_version < version)
122 /* write target recover information */
124 LASSERT(mti->mti_nid_count < MTI_NIDS_MAX);
125 entry_len += mti->mti_nid_count * sizeof(lnet_nid_t);
127 if (entry_len > unit_size) {
128 CWARN("nidtbl: too large entry: entry length %d,"
129 "unit size: %d\n", entry_len, unit_size);
130 GOTO(out, rc = -EOVERFLOW);
133 if (bytes_in_unit < entry_len) {
134 if (units_total == 0) {
139 /* check if we need to consume remaining bytes. */
140 if (last_in_unit != NULL && bytes_in_unit) {
141 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 6, 50, 0)
142 /* May need to swab back to update the length.*/
143 if (exp->exp_need_mne_swab)
144 lustre_swab_mgs_nidtbl_entry(last_in_unit);
146 last_in_unit->mne_length += bytes_in_unit;
147 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 6, 50, 0)
148 if (exp->exp_need_mne_swab)
149 lustre_swab_mgs_nidtbl_entry(last_in_unit);
152 buf += bytes_in_unit;
155 LASSERT((rc & (unit_size - 1)) == 0);
157 if (units_in_page == 0) {
158 /* allocate a new page */
159 pages[index] = alloc_page(GFP_IOFS);
160 if (pages[index] == NULL) {
165 /* destroy previous map */
167 kunmap(pages[index - 1]);
169 /* reassign buffer */
170 buf = kmap(pages[index]);
173 units_in_page = PAGE_CACHE_SIZE / unit_size;
174 LASSERT(units_in_page > 0);
177 /* allocate an unit */
178 LASSERT(((long)buf & (unit_size - 1)) == 0);
179 bytes_in_unit = unit_size;
185 entry = (struct mgs_nidtbl_entry *)buf;
186 entry->mne_version = tgt->mnt_version;
187 entry->mne_instance = mti->mti_instance;
188 entry->mne_index = mti->mti_stripe_index;
189 entry->mne_length = entry_len;
190 entry->mne_type = tgt->mnt_type;
191 entry->mne_nid_type = 0;
192 entry->mne_nid_size = sizeof(lnet_nid_t);
193 entry->mne_nid_count = mti->mti_nid_count;
194 memcpy(entry->u.nids, mti->mti_nids,
195 mti->mti_nid_count * sizeof(lnet_nid_t));
197 #if LUSTRE_VERSION_CODE < OBD_OCD_VERSION(2, 6, 50, 0)
198 /* For LU-1644, swab entry for 2.2 clients. */
199 if (exp->exp_need_mne_swab)
200 lustre_swab_mgs_nidtbl_entry(entry);
203 version = tgt->mnt_version;
207 bytes_in_unit -= entry_len;
208 last_in_unit = entry;
210 CDEBUG(D_MGS, "fsname %s, entry size %d, pages %d/%d/%d/%d.\n",
211 tbl->mn_fsdb->fsdb_name, entry_len,
212 bytes_in_unit, index, nrpages, units_total);
215 kunmap(pages[index - 1]);
217 LASSERT(version <= tbl->mn_version);
218 res->mcr_size = tbl->mn_version;
219 res->mcr_offset = nobuf ? version : tbl->mn_version;
220 mutex_unlock(&tbl->mn_lock);
221 LASSERT(ergo(version == 1, rc == 0)); /* get the log first time */
223 CDEBUG(D_MGS, "Read IR logs %s return with %d, version %llu\n",
224 tbl->mn_fsdb->fsdb_name, rc, version);
228 static int nidtbl_update_version(const struct lu_env *env,
229 struct mgs_device *mgs,
230 struct mgs_nidtbl *tbl)
232 struct dt_object *fsdb;
235 struct lu_buf buf = {
237 .lb_len = sizeof(version)
243 LASSERT(mutex_is_locked(&tbl->mn_lock));
245 fsdb = local_file_find_or_create(env, mgs->mgs_los, mgs->mgs_nidtbl_dir,
246 tbl->mn_fsdb->fsdb_name,
247 S_IFREG | S_IRUGO | S_IWUSR);
249 RETURN(PTR_ERR(fsdb));
251 th = dt_trans_create(env, mgs->mgs_bottom);
253 GOTO(out_put, rc = PTR_ERR(th));
255 th->th_sync = 1; /* update table synchronously */
256 rc = dt_declare_record_write(env, fsdb, &buf, off, th);
260 rc = dt_trans_start_local(env, mgs->mgs_bottom, th);
264 version = cpu_to_le64(tbl->mn_version);
265 rc = dt_record_write(env, fsdb, &buf, &off, th);
268 dt_trans_stop(env, mgs->mgs_bottom, th);
270 lu_object_put(env, &fsdb->do_lu);
274 #define MGS_NIDTBL_VERSION_INIT 2
276 static int nidtbl_read_version(const struct lu_env *env,
277 struct mgs_device *mgs, struct mgs_nidtbl *tbl,
280 struct dt_object *fsdb;
283 struct lu_buf buf = {
285 .lb_len = sizeof(tmpver)
291 LASSERT(mutex_is_locked(&tbl->mn_lock));
293 LASSERT(mgs->mgs_nidtbl_dir);
294 rc = dt_lookup_dir(env, mgs->mgs_nidtbl_dir, tbl->mn_fsdb->fsdb_name,
297 *version = MGS_NIDTBL_VERSION_INIT;
303 fsdb = dt_locate_at(env, mgs->mgs_bottom, &fid,
304 &mgs->mgs_dt_dev.dd_lu_dev, NULL);
306 RETURN(PTR_ERR(fsdb));
308 rc = dt_read(env, fsdb, &buf, &off);
309 if (rc == buf.lb_len) {
310 *version = le64_to_cpu(tmpver);
312 } else if (rc == 0) {
313 *version = MGS_NIDTBL_VERSION_INIT;
315 CERROR("%s: read version file %s error %d\n",
316 mgs->mgs_obd->obd_name, tbl->mn_fsdb->fsdb_name, rc);
318 lu_object_put(env, &fsdb->do_lu);
322 static int mgs_nidtbl_write(const struct lu_env *env, struct fs_db *fsdb,
323 struct mgs_target_info *mti)
325 struct mgs_nidtbl *tbl;
326 struct mgs_nidtbl_target *tgt;
328 int type = mti->mti_flags & LDD_F_SV_TYPE_MASK;
332 type &= ~LDD_F_SV_TYPE_MGS;
335 tbl = &fsdb->fsdb_nidtbl;
336 mutex_lock(&tbl->mn_lock);
337 cfs_list_for_each_entry(tgt, &tbl->mn_targets, mnt_list) {
338 struct mgs_target_info *info = &tgt->mnt_mti;
339 if (type == tgt->mnt_type &&
340 mti->mti_stripe_index == info->mti_stripe_index) {
348 GOTO(out, rc = -ENOMEM);
350 CFS_INIT_LIST_HEAD(&tgt->mnt_list);
352 tgt->mnt_version = 0; /* 0 means invalid */
353 tgt->mnt_type = type;
355 ++tbl->mn_nr_targets;
358 tgt->mnt_version = ++tbl->mn_version;
361 cfs_list_move_tail(&tgt->mnt_list, &tbl->mn_targets);
363 rc = nidtbl_update_version(env, fsdb->fsdb_mgs, tbl);
367 mutex_unlock(&tbl->mn_lock);
369 CERROR("Write NID table version for file system %s error %d\n",
370 fsdb->fsdb_name, rc);
374 static void mgs_nidtbl_fini_fs(struct fs_db *fsdb)
376 struct mgs_nidtbl *tbl = &fsdb->fsdb_nidtbl;
379 mutex_lock(&tbl->mn_lock);
380 tbl->mn_nr_targets = 0;
381 cfs_list_splice_init(&tbl->mn_targets, &head);
382 mutex_unlock(&tbl->mn_lock);
384 while (!cfs_list_empty(&head)) {
385 struct mgs_nidtbl_target *tgt;
386 tgt = list_entry(head.next, struct mgs_nidtbl_target, mnt_list);
387 cfs_list_del(&tgt->mnt_list);
392 static int mgs_nidtbl_init_fs(const struct lu_env *env, struct fs_db *fsdb)
394 struct mgs_nidtbl *tbl = &fsdb->fsdb_nidtbl;
397 CFS_INIT_LIST_HEAD(&tbl->mn_targets);
398 mutex_init(&tbl->mn_lock);
399 tbl->mn_nr_targets = 0;
401 mutex_lock(&tbl->mn_lock);
402 rc = nidtbl_read_version(env, fsdb->fsdb_mgs, tbl, &tbl->mn_version);
403 mutex_unlock(&tbl->mn_lock);
405 CERROR("%s: IR: failed to read current version, rc = %d\n",
406 fsdb->fsdb_mgs->mgs_obd->obd_name, rc);
408 CDEBUG(D_MGS, "IR: current version is %llu\n",
414 /* --------- Imperative Recovery relies on nidtbl stuff ------- */
415 void mgs_ir_notify_complete(struct fs_db *fsdb)
418 cfs_duration_t delta;
420 atomic_set(&fsdb->fsdb_notify_phase, 0);
423 fsdb->fsdb_notify_count++;
424 delta = cfs_time_sub(cfs_time_current(), fsdb->fsdb_notify_start);
425 fsdb->fsdb_notify_total += delta;
426 if (delta > fsdb->fsdb_notify_max)
427 fsdb->fsdb_notify_max = delta;
429 cfs_duration_usec(delta, &tv);
430 CDEBUG(D_MGS, "Revoke recover lock of %s completed after %ld.%06lds\n",
431 fsdb->fsdb_name, tv.tv_sec, tv.tv_usec);
434 static int mgs_ir_notify(void *arg)
436 struct fs_db *fsdb = arg;
437 struct ldlm_res_id resid;
439 char name[sizeof(fsdb->fsdb_name) + 20];
441 LASSERTF(sizeof(name) < 32, "name is too large to be in stack.\n");
442 sprintf(name, "mgs_%s_notify", fsdb->fsdb_name);
444 complete(&fsdb->fsdb_notify_comp);
446 set_user_nice(current, -2);
448 mgc_fsname2resid(fsdb->fsdb_name, &resid, CONFIG_T_RECOVER);
450 struct l_wait_info lwi = { 0 };
452 l_wait_event(fsdb->fsdb_notify_waitq,
453 fsdb->fsdb_notify_stop ||
454 atomic_read(&fsdb->fsdb_notify_phase),
456 if (fsdb->fsdb_notify_stop)
459 CDEBUG(D_MGS, "%s woken up, phase is %d\n",
460 name, atomic_read(&fsdb->fsdb_notify_phase));
462 fsdb->fsdb_notify_start = cfs_time_current();
463 mgs_revoke_lock(fsdb->fsdb_mgs, fsdb, CONFIG_T_RECOVER);
466 complete(&fsdb->fsdb_notify_comp);
470 int mgs_ir_init_fs(const struct lu_env *env, struct mgs_device *mgs,
473 struct task_struct *task;
476 ir_timeout = OBD_IR_MGS_TIMEOUT;
478 fsdb->fsdb_ir_state = IR_FULL;
479 if (cfs_time_before(cfs_time_current_sec(),
480 mgs->mgs_start_time + ir_timeout))
481 fsdb->fsdb_ir_state = IR_STARTUP;
482 fsdb->fsdb_nonir_clients = 0;
483 CFS_INIT_LIST_HEAD(&fsdb->fsdb_clients);
485 /* start notify thread */
486 fsdb->fsdb_mgs = mgs;
487 atomic_set(&fsdb->fsdb_notify_phase, 0);
488 init_waitqueue_head(&fsdb->fsdb_notify_waitq);
489 init_completion(&fsdb->fsdb_notify_comp);
491 task = kthread_run(mgs_ir_notify, fsdb,
492 "mgs_%s_notify", fsdb->fsdb_name);
494 wait_for_completion(&fsdb->fsdb_notify_comp);
496 CERROR("Start notify thread error %ld\n", PTR_ERR(task));
498 mgs_nidtbl_init_fs(env, fsdb);
502 void mgs_ir_fini_fs(struct mgs_device *mgs, struct fs_db *fsdb)
504 if (test_bit(FSDB_MGS_SELF, &fsdb->fsdb_flags))
507 mgs_fsc_cleanup_by_fsdb(fsdb);
509 mgs_nidtbl_fini_fs(fsdb);
511 LASSERT(cfs_list_empty(&fsdb->fsdb_clients));
513 fsdb->fsdb_notify_stop = 1;
514 wake_up(&fsdb->fsdb_notify_waitq);
515 wait_for_completion(&fsdb->fsdb_notify_comp);
518 /* caller must have held fsdb_mutex */
519 static inline void ir_state_graduate(struct fs_db *fsdb)
521 if (fsdb->fsdb_ir_state == IR_STARTUP) {
522 if (cfs_time_before(fsdb->fsdb_mgs->mgs_start_time + ir_timeout,
523 cfs_time_current_sec())) {
524 fsdb->fsdb_ir_state = IR_FULL;
525 if (fsdb->fsdb_nonir_clients)
526 fsdb->fsdb_ir_state = IR_PARTIAL;
531 int mgs_ir_update(const struct lu_env *env, struct mgs_device *mgs,
532 struct mgs_target_info *mti)
538 if (mti->mti_instance == 0)
541 rc = mgs_find_or_make_fsdb(env, mgs, mti->mti_fsname, &fsdb);
545 rc = mgs_nidtbl_write(env, fsdb, mti);
550 mutex_lock(&fsdb->fsdb_mutex);
551 ir_state_graduate(fsdb);
552 switch (fsdb->fsdb_ir_state) {
554 mti->mti_flags |= LDD_F_IR_CAPABLE;
564 mutex_unlock(&fsdb->fsdb_mutex);
566 LASSERT(ergo(mti->mti_flags & LDD_F_IR_CAPABLE, notify));
568 CDEBUG(D_MGS, "Try to revoke recover lock of %s\n",
570 atomic_inc(&fsdb->fsdb_notify_phase);
571 wake_up(&fsdb->fsdb_notify_waitq);
576 /* NID table can be cached by two entities: Clients and MDTs */
582 static int delogname(char *logname, char *fsname, int *typ)
588 ptr = strrchr(logname, '-');
592 /* decouple file system name. The llog name may be:
593 * - "prefix-fsname", prefix is "cliir" or "mdtir"
595 if (strncmp(ptr, "-mdtir", 6) == 0)
597 else if (strncmp(ptr, "-cliir", 6) == 0)
606 memcpy(fsname, logname, len);
613 int mgs_get_ir_logs(struct ptlrpc_request *req)
615 struct lu_env *env = req->rq_svc_thread->t_env;
616 struct mgs_device *mgs = exp2mgs_dev(req->rq_export);
618 struct mgs_config_body *body;
619 struct mgs_config_res *res;
620 struct ptlrpc_bulk_desc *desc;
621 struct l_wait_info lwi;
631 struct page **pages = NULL;
634 body = req_capsule_client_get(&req->rq_pill, &RMF_MGS_CONFIG_BODY);
638 if (body->mcb_type != CONFIG_T_RECOVER)
641 rc = delogname(body->mcb_name, fsname, &type);
645 rc = mgs_find_or_make_fsdb(env, mgs, fsname, &fsdb);
649 bufsize = body->mcb_units << body->mcb_bits;
650 nrpages = (bufsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
651 if (nrpages > PTLRPC_MAX_BRW_PAGES)
654 CDEBUG(D_MGS, "Reading IR log %s bufsize %ld.\n",
655 body->mcb_name, bufsize);
657 OBD_ALLOC(pages, sizeof(*pages) * nrpages);
661 res = req_capsule_server_get(&req->rq_pill, &RMF_MGS_CONFIG_RES);
663 GOTO(out, rc = -EINVAL);
665 res->mcr_offset = body->mcb_offset;
666 unit_size = min_t(int, 1 << body->mcb_bits, PAGE_CACHE_SIZE);
667 bytes = mgs_nidtbl_read(req->rq_export, &fsdb->fsdb_nidtbl, res,
668 pages, nrpages, bufsize / unit_size, unit_size);
670 GOTO(out, rc = bytes);
672 /* start bulk transfer */
673 page_count = (bytes + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
674 LASSERT(page_count <= nrpages);
675 desc = ptlrpc_prep_bulk_exp(req, page_count, 1,
676 BULK_PUT_SOURCE, MGS_BULK_PORTAL);
678 GOTO(out, rc = -ENOMEM);
680 for (i = 0; i < page_count && bytes > 0; i++) {
681 ptlrpc_prep_bulk_page_pin(desc, pages[i], 0,
682 min_t(int, bytes, PAGE_CACHE_SIZE));
683 bytes -= PAGE_CACHE_SIZE;
686 rc = target_bulk_io(req->rq_export, desc, &lwi);
687 ptlrpc_free_bulk_pin(desc);
690 for (i = 0; i < nrpages; i++) {
691 if (pages[i] == NULL)
693 __free_page(pages[i]);
695 OBD_FREE(pages, sizeof(*pages) * nrpages);
699 static int lprocfs_ir_set_state(struct fs_db *fsdb, const char *buf)
701 const char *strings[] = IR_STRINGS;
705 for (i = 0; i < ARRAY_SIZE(strings); i++) {
706 if (strcmp(strings[i], buf) == 0) {
714 CDEBUG(D_MGS, "change fsr state of %s from %s to %s\n",
715 fsdb->fsdb_name, strings[fsdb->fsdb_ir_state], strings[state]);
716 mutex_lock(&fsdb->fsdb_mutex);
717 if (state == IR_FULL && fsdb->fsdb_nonir_clients)
719 fsdb->fsdb_ir_state = state;
720 mutex_unlock(&fsdb->fsdb_mutex);
725 static int lprocfs_ir_set_timeout(struct fs_db *fsdb, const char *buf)
730 static int lprocfs_ir_clear_stats(struct fs_db *fsdb, const char *buf)
735 fsdb->fsdb_notify_total = 0;
736 fsdb->fsdb_notify_max = 0;
737 fsdb->fsdb_notify_count = 0;
741 static struct lproc_ir_cmd {
744 int (*handler)(struct fs_db *, const char *);
746 { "state=", 6, lprocfs_ir_set_state },
747 { "timeout=", 8, lprocfs_ir_set_timeout },
748 { "0", 1, lprocfs_ir_clear_stats }
751 int lprocfs_wr_ir_state(struct file *file, const char *buffer,
752 unsigned long count, void *data)
754 struct fs_db *fsdb = data;
759 if (count > PAGE_CACHE_SIZE)
762 OBD_ALLOC(kbuf, count + 1);
766 if (copy_from_user(kbuf, buffer, count)) {
767 OBD_FREE(kbuf, count);
771 kbuf[count] = 0; /* buffer is supposed to end with 0 */
772 if (kbuf[count - 1] == '\n')
776 /* fsname=<file system name> must be the 1st entry */
777 while (ptr != NULL) {
781 tmpptr = strchr(ptr, ';');
786 for (i = 0; i < ARRAY_SIZE(ir_cmds); i++) {
787 struct lproc_ir_cmd *cmd;
791 cmdlen = cmd->namelen;
792 if (strncmp(cmd->name, ptr, cmdlen) == 0) {
794 rc = cmd->handler(fsdb, ptr);
804 CERROR("Unable to process command: %s(%d)\n", ptr, rc);
805 OBD_FREE(kbuf, count + 1);
809 int lprocfs_rd_ir_state(struct seq_file *seq, void *data)
811 struct fs_db *fsdb = data;
812 struct mgs_nidtbl *tbl = &fsdb->fsdb_nidtbl;
813 const char *ir_strings[] = IR_STRINGS;
814 struct timeval tv_max;
817 /* mgs_live_seq_show() already holds fsdb_mutex. */
818 ir_state_graduate(fsdb);
820 seq_printf(seq, "\nimperative_recovery_state:\n");
823 " nonir_clients: %d\n"
824 " nidtbl_version: %lld\n",
825 ir_strings[fsdb->fsdb_ir_state], fsdb->fsdb_nonir_clients,
828 cfs_duration_usec(fsdb->fsdb_notify_total, &tv);
829 cfs_duration_usec(fsdb->fsdb_notify_max, &tv_max);
831 seq_printf(seq, " notify_duration_total: %lu.%06lu\n"
832 " notify_duation_max: %lu.%06lu\n"
833 " notify_count: %u\n",
834 tv.tv_sec, tv.tv_usec,
835 tv_max.tv_sec, tv_max.tv_usec,
836 fsdb->fsdb_notify_count);
841 int lprocfs_rd_ir_timeout(char *page, char **start, off_t off, int count,
842 int *eof, void *data)
845 return snprintf(page, count, "%d\n", ir_timeout);
848 int lprocfs_wr_ir_timeout(struct file *file, const char *buffer,
849 unsigned long count, void *data)
851 return lprocfs_wr_uint(file, buffer, count, &ir_timeout);
854 /* --------------- Handle non IR support clients --------------- */
855 /* attach a lustre file system to an export */
856 int mgs_fsc_attach(const struct lu_env *env, struct obd_export *exp,
859 struct mgs_export_data *data = &exp->u.eu_mgs_data;
860 struct mgs_device *mgs = exp2mgs_dev(exp);
862 struct mgs_fsc *fsc = NULL;
863 struct mgs_fsc *new_fsc = NULL;
868 rc = mgs_find_or_make_fsdb(env, mgs, fsname, &fsdb);
872 /* allocate a new fsc in case we need it in spinlock. */
873 OBD_ALLOC_PTR(new_fsc);
877 CFS_INIT_LIST_HEAD(&new_fsc->mfc_export_list);
878 CFS_INIT_LIST_HEAD(&new_fsc->mfc_fsdb_list);
879 new_fsc->mfc_fsdb = fsdb;
880 new_fsc->mfc_export = class_export_get(exp);
881 new_fsc->mfc_ir_capable = !!(exp_connect_flags(exp) &
882 OBD_CONNECT_IMP_RECOV);
885 mutex_lock(&fsdb->fsdb_mutex);
887 /* tend to find it in export list because this list is shorter. */
888 spin_lock(&data->med_lock);
889 cfs_list_for_each_entry(fsc, &data->med_clients, mfc_export_list) {
890 if (strcmp(fsname, fsc->mfc_fsdb->fsdb_name) == 0) {
899 /* add it into export list. */
900 cfs_list_add(&fsc->mfc_export_list, &data->med_clients);
902 /* add into fsdb list. */
903 cfs_list_add(&fsc->mfc_fsdb_list, &fsdb->fsdb_clients);
904 if (!fsc->mfc_ir_capable) {
905 ++fsdb->fsdb_nonir_clients;
906 if (fsdb->fsdb_ir_state == IR_FULL)
907 fsdb->fsdb_ir_state = IR_PARTIAL;
911 spin_unlock(&data->med_lock);
912 mutex_unlock(&fsdb->fsdb_mutex);
915 class_export_put(new_fsc->mfc_export);
916 OBD_FREE_PTR(new_fsc);
921 void mgs_fsc_cleanup(struct obd_export *exp)
923 struct mgs_export_data *data = &exp->u.eu_mgs_data;
924 struct mgs_fsc *fsc, *tmp;
927 spin_lock(&data->med_lock);
928 cfs_list_splice_init(&data->med_clients, &head);
929 spin_unlock(&data->med_lock);
931 cfs_list_for_each_entry_safe(fsc, tmp, &head, mfc_export_list) {
932 struct fs_db *fsdb = fsc->mfc_fsdb;
934 LASSERT(fsc->mfc_export == exp);
936 mutex_lock(&fsdb->fsdb_mutex);
937 cfs_list_del_init(&fsc->mfc_fsdb_list);
938 if (fsc->mfc_ir_capable == 0) {
939 --fsdb->fsdb_nonir_clients;
940 LASSERT(fsdb->fsdb_ir_state != IR_FULL);
941 if (fsdb->fsdb_nonir_clients == 0 &&
942 fsdb->fsdb_ir_state == IR_PARTIAL)
943 fsdb->fsdb_ir_state = IR_FULL;
945 mutex_unlock(&fsdb->fsdb_mutex);
946 cfs_list_del_init(&fsc->mfc_export_list);
947 class_export_put(fsc->mfc_export);
952 /* must be called with fsdb->fsdb_mutex held */
953 void mgs_fsc_cleanup_by_fsdb(struct fs_db *fsdb)
955 struct mgs_fsc *fsc, *tmp;
957 cfs_list_for_each_entry_safe(fsc, tmp, &fsdb->fsdb_clients,
959 struct mgs_export_data *data = &fsc->mfc_export->u.eu_mgs_data;
961 LASSERT(fsdb == fsc->mfc_fsdb);
962 cfs_list_del_init(&fsc->mfc_fsdb_list);
964 spin_lock(&data->med_lock);
965 cfs_list_del_init(&fsc->mfc_export_list);
966 spin_unlock(&data->med_lock);
967 class_export_put(fsc->mfc_export);
971 fsdb->fsdb_nonir_clients = 0;
972 if (fsdb->fsdb_ir_state == IR_PARTIAL)
973 fsdb->fsdb_ir_state = IR_FULL;