1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
4 * Copyright (C) 2004, 2005 Oracle. All rights reserved.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
16 * You should have received a copy of the GNU General Public
17 * License along with this program; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 021110-1307, USA.
22 #include <linux/kernel.h>
23 #include <linux/sched.h>
24 #include <linux/jiffies.h>
25 #include <linux/module.h>
27 #include <linux/bio.h>
28 #include <linux/blkdev.h>
29 #include <linux/delay.h>
30 #include <linux/file.h>
31 #include <linux/kthread.h>
32 #include <linux/configfs.h>
33 #include <linux/random.h>
34 #include <linux/crc32.h>
35 #include <linux/time.h>
36 #include <linux/debugfs.h>
37 #include <linux/slab.h>
38 #include <linux/bitmap.h>
39 #include <linux/ktime.h>
40 #include "heartbeat.h"
42 #include "nodemanager.h"
49 * The first heartbeat pass had one global thread that would serialize all hb
50 * callback calls. This global serializing sem should only be removed once
51 * we've made sure that all callees can deal with being called concurrently
52 * from multiple hb region threads.
54 static DECLARE_RWSEM(o2hb_callback_sem);
57 * multiple hb threads are watching multiple regions. A node is live
58 * whenever any of the threads sees activity from the node in its region.
60 static DEFINE_SPINLOCK(o2hb_live_lock);
61 static struct list_head o2hb_live_slots[O2NM_MAX_NODES];
62 static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
63 static LIST_HEAD(o2hb_node_events);
64 static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue);
67 * In global heartbeat, we maintain a series of region bitmaps.
68 * - o2hb_region_bitmap allows us to limit the region number to max region.
69 * - o2hb_live_region_bitmap tracks live regions (seen steady iterations).
70 * - o2hb_quorum_region_bitmap tracks live regions that have seen all nodes
72 * - o2hb_failed_region_bitmap tracks the regions that have seen io timeouts.
74 static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
75 static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
76 static unsigned long o2hb_quorum_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
77 static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
79 #define O2HB_DB_TYPE_LIVENODES 0
80 #define O2HB_DB_TYPE_LIVEREGIONS 1
81 #define O2HB_DB_TYPE_QUORUMREGIONS 2
82 #define O2HB_DB_TYPE_FAILEDREGIONS 3
83 #define O2HB_DB_TYPE_REGION_LIVENODES 4
84 #define O2HB_DB_TYPE_REGION_NUMBER 5
85 #define O2HB_DB_TYPE_REGION_ELAPSED_TIME 6
86 #define O2HB_DB_TYPE_REGION_PINNED 7
87 struct o2hb_debug_buf {
94 static struct o2hb_debug_buf *o2hb_db_livenodes;
95 static struct o2hb_debug_buf *o2hb_db_liveregions;
96 static struct o2hb_debug_buf *o2hb_db_quorumregions;
97 static struct o2hb_debug_buf *o2hb_db_failedregions;
99 #define O2HB_DEBUG_DIR "o2hb"
100 #define O2HB_DEBUG_LIVENODES "livenodes"
101 #define O2HB_DEBUG_LIVEREGIONS "live_regions"
102 #define O2HB_DEBUG_QUORUMREGIONS "quorum_regions"
103 #define O2HB_DEBUG_FAILEDREGIONS "failed_regions"
104 #define O2HB_DEBUG_REGION_NUMBER "num"
105 #define O2HB_DEBUG_REGION_ELAPSED_TIME "elapsed_time_in_ms"
106 #define O2HB_DEBUG_REGION_PINNED "pinned"
108 static struct dentry *o2hb_debug_dir;
109 static struct dentry *o2hb_debug_livenodes;
110 static struct dentry *o2hb_debug_liveregions;
111 static struct dentry *o2hb_debug_quorumregions;
112 static struct dentry *o2hb_debug_failedregions;
114 static LIST_HEAD(o2hb_all_regions);
116 static struct o2hb_callback {
117 struct list_head list;
118 } o2hb_callbacks[O2HB_NUM_CB];
120 static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type);
122 #define O2HB_DEFAULT_BLOCK_BITS 9
124 enum o2hb_heartbeat_modes {
125 O2HB_HEARTBEAT_LOCAL = 0,
126 O2HB_HEARTBEAT_GLOBAL,
127 O2HB_HEARTBEAT_NUM_MODES,
130 char *o2hb_heartbeat_mode_desc[O2HB_HEARTBEAT_NUM_MODES] = {
131 "local", /* O2HB_HEARTBEAT_LOCAL */
132 "global", /* O2HB_HEARTBEAT_GLOBAL */
135 unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD;
136 unsigned int o2hb_heartbeat_mode = O2HB_HEARTBEAT_LOCAL;
139 * o2hb_dependent_users tracks the number of registered callbacks that depend
140 * on heartbeat. o2net and o2dlm are two entities that register this callback.
141 * However only o2dlm depends on the heartbeat. It does not want the heartbeat
142 * to stop while a dlm domain is still active.
144 unsigned int o2hb_dependent_users;
147 * In global heartbeat mode, all regions are pinned if there are one or more
148 * dependent users and the quorum region count is <= O2HB_PIN_CUT_OFF. All
149 * regions are unpinned if the region count exceeds the cut off or the number
150 * of dependent users falls to zero.
152 #define O2HB_PIN_CUT_OFF 3
155 * In local heartbeat mode, we assume the dlm domain name to be the same as
156 * region uuid. This is true for domains created for the file system but not
157 * necessarily true for userdlm domains. This is a known limitation.
159 * In global heartbeat mode, we pin/unpin all o2hb regions. This solution
160 * works for both file system and userdlm domains.
162 static int o2hb_region_pin(const char *region_uuid);
163 static void o2hb_region_unpin(const char *region_uuid);
165 /* Only sets a new threshold if there are no active regions.
167 * No locking or otherwise interesting code is required for reading
168 * o2hb_dead_threshold as it can't change once regions are active and
169 * it's not interesting to anyone until then anyway. */
170 static void o2hb_dead_threshold_set(unsigned int threshold)
172 if (threshold > O2HB_MIN_DEAD_THRESHOLD) {
173 spin_lock(&o2hb_live_lock);
174 if (list_empty(&o2hb_all_regions))
175 o2hb_dead_threshold = threshold;
176 spin_unlock(&o2hb_live_lock);
180 static int o2hb_global_heartbeat_mode_set(unsigned int hb_mode)
184 if (hb_mode < O2HB_HEARTBEAT_NUM_MODES) {
185 spin_lock(&o2hb_live_lock);
186 if (list_empty(&o2hb_all_regions)) {
187 o2hb_heartbeat_mode = hb_mode;
190 spin_unlock(&o2hb_live_lock);
196 struct o2hb_node_event {
197 struct list_head hn_item;
198 enum o2hb_callback_type hn_event_type;
199 struct o2nm_node *hn_node;
203 struct o2hb_disk_slot {
204 struct o2hb_disk_heartbeat_block *ds_raw_block;
207 u64 ds_last_generation;
208 u16 ds_equal_samples;
209 u16 ds_changed_samples;
210 struct list_head ds_live_item;
213 /* each thread owns a region.. when we're asked to tear down the region
214 * we ask the thread to stop, who cleans up the region */
216 struct config_item hr_item;
218 struct list_head hr_all_item;
219 unsigned hr_unclean_stop:1,
224 /* protected by the hr_callback_sem */
225 struct task_struct *hr_task;
227 unsigned int hr_blocks;
228 unsigned long long hr_start_block;
230 unsigned int hr_block_bits;
231 unsigned int hr_block_bytes;
233 unsigned int hr_slots_per_page;
234 unsigned int hr_num_pages;
236 struct page **hr_slot_data;
237 struct block_device *hr_bdev;
238 struct o2hb_disk_slot *hr_slots;
240 /* live node map of this region */
241 unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
242 unsigned int hr_region_num;
244 struct dentry *hr_debug_dir;
245 struct dentry *hr_debug_livenodes;
246 struct dentry *hr_debug_regnum;
247 struct dentry *hr_debug_elapsed_time;
248 struct dentry *hr_debug_pinned;
249 struct o2hb_debug_buf *hr_db_livenodes;
250 struct o2hb_debug_buf *hr_db_regnum;
251 struct o2hb_debug_buf *hr_db_elapsed_time;
252 struct o2hb_debug_buf *hr_db_pinned;
254 /* let the person setting up hb wait for it to return until it
255 * has reached a 'steady' state. This will be fixed when we have
256 * a more complete api that doesn't lead to this sort of fragility. */
257 atomic_t hr_steady_iterations;
259 /* terminate o2hb thread if it does not reach steady state
260 * (hr_steady_iterations == 0) within hr_unsteady_iterations */
261 atomic_t hr_unsteady_iterations;
263 char hr_dev_name[BDEVNAME_SIZE];
265 unsigned int hr_timeout_ms;
267 /* randomized as the region goes up and down so that a node
268 * recognizes a node going up and down in one iteration */
271 struct delayed_work hr_write_timeout_work;
272 unsigned long hr_last_timeout_start;
274 /* Used during o2hb_check_slot to hold a copy of the block
275 * being checked because we temporarily have to zero out the
277 struct o2hb_disk_heartbeat_block *hr_tmp_block;
280 struct o2hb_bio_wait_ctxt {
281 atomic_t wc_num_reqs;
282 struct completion wc_io_complete;
286 static void o2hb_write_timeout(struct work_struct *work)
290 struct o2hb_region *reg =
291 container_of(work, struct o2hb_region,
292 hr_write_timeout_work.work);
294 mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u "
295 "milliseconds\n", reg->hr_dev_name,
296 jiffies_to_msecs(jiffies - reg->hr_last_timeout_start));
298 if (o2hb_global_heartbeat_active()) {
299 spin_lock_irqsave(&o2hb_live_lock, flags);
300 if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
301 set_bit(reg->hr_region_num, o2hb_failed_region_bitmap);
302 failed = bitmap_weight(o2hb_failed_region_bitmap,
304 quorum = bitmap_weight(o2hb_quorum_region_bitmap,
306 spin_unlock_irqrestore(&o2hb_live_lock, flags);
308 mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n",
312 * Fence if the number of failed regions >= half the number
315 if ((failed << 1) < quorum)
319 o2quo_disk_timeout();
322 static void o2hb_arm_write_timeout(struct o2hb_region *reg)
324 /* Arm writeout only after thread reaches steady state */
325 if (atomic_read(®->hr_steady_iterations) != 0)
328 mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n",
329 O2HB_MAX_WRITE_TIMEOUT_MS);
331 if (o2hb_global_heartbeat_active()) {
332 spin_lock(&o2hb_live_lock);
333 clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap);
334 spin_unlock(&o2hb_live_lock);
336 cancel_delayed_work(®->hr_write_timeout_work);
337 reg->hr_last_timeout_start = jiffies;
338 schedule_delayed_work(®->hr_write_timeout_work,
339 msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS));
342 static void o2hb_disarm_write_timeout(struct o2hb_region *reg)
344 cancel_delayed_work_sync(®->hr_write_timeout_work);
347 static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc)
349 atomic_set(&wc->wc_num_reqs, 1);
350 init_completion(&wc->wc_io_complete);
354 /* Used in error paths too */
355 static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc,
358 /* sadly atomic_sub_and_test() isn't available on all platforms. The
359 * good news is that the fast path only completes one at a time */
361 if (atomic_dec_and_test(&wc->wc_num_reqs)) {
363 complete(&wc->wc_io_complete);
368 static void o2hb_wait_on_io(struct o2hb_region *reg,
369 struct o2hb_bio_wait_ctxt *wc)
371 o2hb_bio_wait_dec(wc, 1);
372 wait_for_completion(&wc->wc_io_complete);
375 static void o2hb_bio_end_io(struct bio *bio)
377 struct o2hb_bio_wait_ctxt *wc = bio->bi_private;
380 mlog(ML_ERROR, "IO Error %d\n", bio->bi_error);
381 wc->wc_error = bio->bi_error;
384 o2hb_bio_wait_dec(wc, 1);
388 /* Setup a Bio to cover I/O against num_slots slots starting at
390 static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg,
391 struct o2hb_bio_wait_ctxt *wc,
392 unsigned int *current_slot,
393 unsigned int max_slots)
395 int len, current_page;
396 unsigned int vec_len, vec_start;
397 unsigned int bits = reg->hr_block_bits;
398 unsigned int spp = reg->hr_slots_per_page;
399 unsigned int cs = *current_slot;
403 /* Testing has shown this allocation to take long enough under
404 * GFP_KERNEL that the local node can get fenced. It would be
405 * nicest if we could pre-allocate these bios and avoid this
407 bio = bio_alloc(GFP_ATOMIC, 16);
409 mlog(ML_ERROR, "Could not alloc slots BIO!\n");
410 bio = ERR_PTR(-ENOMEM);
414 /* Must put everything in 512 byte sectors for the bio... */
415 bio->bi_iter.bi_sector = (reg->hr_start_block + cs) << (bits - 9);
416 bio->bi_bdev = reg->hr_bdev;
417 bio->bi_private = wc;
418 bio->bi_end_io = o2hb_bio_end_io;
420 vec_start = (cs << bits) % PAGE_CACHE_SIZE;
421 while(cs < max_slots) {
422 current_page = cs / spp;
423 page = reg->hr_slot_data[current_page];
425 vec_len = min(PAGE_CACHE_SIZE - vec_start,
426 (max_slots-cs) * (PAGE_CACHE_SIZE/spp) );
428 mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n",
429 current_page, vec_len, vec_start);
431 len = bio_add_page(bio, page, vec_len, vec_start);
432 if (len != vec_len) break;
434 cs += vec_len / (PAGE_CACHE_SIZE/spp);
443 static int o2hb_read_slots(struct o2hb_region *reg,
444 unsigned int max_slots)
446 unsigned int current_slot=0;
448 struct o2hb_bio_wait_ctxt wc;
451 o2hb_bio_wait_init(&wc);
453 while(current_slot < max_slots) {
454 bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots);
456 status = PTR_ERR(bio);
461 atomic_inc(&wc.wc_num_reqs);
462 submit_bio(READ, bio);
468 o2hb_wait_on_io(reg, &wc);
469 if (wc.wc_error && !status)
470 status = wc.wc_error;
475 static int o2hb_issue_node_write(struct o2hb_region *reg,
476 struct o2hb_bio_wait_ctxt *write_wc)
482 o2hb_bio_wait_init(write_wc);
484 slot = o2nm_this_node();
486 bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1);
488 status = PTR_ERR(bio);
493 atomic_inc(&write_wc->wc_num_reqs);
494 submit_bio(WRITE_SYNC, bio);
501 static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg,
502 struct o2hb_disk_heartbeat_block *hb_block)
507 /* We want to compute the block crc with a 0 value in the
508 * hb_cksum field. Save it off here and replace after the
510 old_cksum = hb_block->hb_cksum;
511 hb_block->hb_cksum = 0;
513 ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes);
515 hb_block->hb_cksum = old_cksum;
520 static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block)
522 mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, "
523 "cksum = 0x%x, generation 0x%llx\n",
524 (long long)le64_to_cpu(hb_block->hb_seq),
525 hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum),
526 (long long)le64_to_cpu(hb_block->hb_generation));
529 static int o2hb_verify_crc(struct o2hb_region *reg,
530 struct o2hb_disk_heartbeat_block *hb_block)
534 read = le32_to_cpu(hb_block->hb_cksum);
535 computed = o2hb_compute_block_crc_le(reg, hb_block);
537 return read == computed;
541 * Compare the slot data with what we wrote in the last iteration.
542 * If the match fails, print an appropriate error message. This is to
543 * detect errors like... another node hearting on the same slot,
544 * flaky device that is losing writes, etc.
545 * Returns 1 if check succeeds, 0 otherwise.
547 static int o2hb_check_own_slot(struct o2hb_region *reg)
549 struct o2hb_disk_slot *slot;
550 struct o2hb_disk_heartbeat_block *hb_block;
553 slot = ®->hr_slots[o2nm_this_node()];
554 /* Don't check on our 1st timestamp */
555 if (!slot->ds_last_time)
558 hb_block = slot->ds_raw_block;
559 if (le64_to_cpu(hb_block->hb_seq) == slot->ds_last_time &&
560 le64_to_cpu(hb_block->hb_generation) == slot->ds_last_generation &&
561 hb_block->hb_node == slot->ds_node_num)
564 #define ERRSTR1 "Another node is heartbeating on device"
565 #define ERRSTR2 "Heartbeat generation mismatch on device"
566 #define ERRSTR3 "Heartbeat sequence mismatch on device"
568 if (hb_block->hb_node != slot->ds_node_num)
570 else if (le64_to_cpu(hb_block->hb_generation) !=
571 slot->ds_last_generation)
576 mlog(ML_ERROR, "%s (%s): expected(%u:0x%llx, 0x%llx), "
577 "ondisk(%u:0x%llx, 0x%llx)\n", errstr, reg->hr_dev_name,
578 slot->ds_node_num, (unsigned long long)slot->ds_last_generation,
579 (unsigned long long)slot->ds_last_time, hb_block->hb_node,
580 (unsigned long long)le64_to_cpu(hb_block->hb_generation),
581 (unsigned long long)le64_to_cpu(hb_block->hb_seq));
586 static inline void o2hb_prepare_block(struct o2hb_region *reg,
591 struct o2hb_disk_slot *slot;
592 struct o2hb_disk_heartbeat_block *hb_block;
594 node_num = o2nm_this_node();
595 slot = ®->hr_slots[node_num];
597 hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block;
598 memset(hb_block, 0, reg->hr_block_bytes);
599 /* TODO: time stuff */
600 cputime = CURRENT_TIME.tv_sec;
604 hb_block->hb_seq = cpu_to_le64(cputime);
605 hb_block->hb_node = node_num;
606 hb_block->hb_generation = cpu_to_le64(generation);
607 hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS);
609 /* This step must always happen last! */
610 hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg,
613 mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n",
614 (long long)generation,
615 le32_to_cpu(hb_block->hb_cksum));
618 static void o2hb_fire_callbacks(struct o2hb_callback *hbcall,
619 struct o2nm_node *node,
622 struct o2hb_callback_func *f;
624 list_for_each_entry(f, &hbcall->list, hc_item) {
625 mlog(ML_HEARTBEAT, "calling funcs %p\n", f);
626 (f->hc_func)(node, idx, f->hc_data);
630 /* Will run the list in order until we process the passed event */
631 static void o2hb_run_event_list(struct o2hb_node_event *queued_event)
633 struct o2hb_callback *hbcall;
634 struct o2hb_node_event *event;
636 /* Holding callback sem assures we don't alter the callback
637 * lists when doing this, and serializes ourselves with other
638 * processes wanting callbacks. */
639 down_write(&o2hb_callback_sem);
641 spin_lock(&o2hb_live_lock);
642 while (!list_empty(&o2hb_node_events)
643 && !list_empty(&queued_event->hn_item)) {
644 event = list_entry(o2hb_node_events.next,
645 struct o2hb_node_event,
647 list_del_init(&event->hn_item);
648 spin_unlock(&o2hb_live_lock);
650 mlog(ML_HEARTBEAT, "Node %s event for %d\n",
651 event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN",
654 hbcall = hbcall_from_type(event->hn_event_type);
656 /* We should *never* have gotten on to the list with a
657 * bad type... This isn't something that we should try
658 * to recover from. */
659 BUG_ON(IS_ERR(hbcall));
661 o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num);
663 spin_lock(&o2hb_live_lock);
665 spin_unlock(&o2hb_live_lock);
667 up_write(&o2hb_callback_sem);
670 static void o2hb_queue_node_event(struct o2hb_node_event *event,
671 enum o2hb_callback_type type,
672 struct o2nm_node *node,
675 assert_spin_locked(&o2hb_live_lock);
677 BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB));
679 event->hn_event_type = type;
680 event->hn_node = node;
681 event->hn_node_num = node_num;
683 mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n",
684 type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num);
686 list_add_tail(&event->hn_item, &o2hb_node_events);
689 static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot)
691 struct o2hb_node_event event =
692 { .hn_item = LIST_HEAD_INIT(event.hn_item), };
693 struct o2nm_node *node;
696 node = o2nm_get_node_by_num(slot->ds_node_num);
700 spin_lock(&o2hb_live_lock);
701 if (!list_empty(&slot->ds_live_item)) {
702 mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n",
705 list_del_init(&slot->ds_live_item);
707 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
708 clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
710 o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node,
715 spin_unlock(&o2hb_live_lock);
718 o2hb_run_event_list(&event);
723 static void o2hb_set_quorum_device(struct o2hb_region *reg)
725 if (!o2hb_global_heartbeat_active())
728 /* Prevent race with o2hb_heartbeat_group_drop_item() */
729 if (kthread_should_stop())
732 /* Tag region as quorum only after thread reaches steady state */
733 if (atomic_read(®->hr_steady_iterations) != 0)
736 spin_lock(&o2hb_live_lock);
738 if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
742 * A region can be added to the quorum only when it sees all
743 * live nodes heartbeat on it. In other words, the region has been
744 * added to all nodes.
746 if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap,
747 sizeof(o2hb_live_node_bitmap)))
750 printk(KERN_NOTICE "o2hb: Region %s (%s) is now a quorum device\n",
751 config_item_name(®->hr_item), reg->hr_dev_name);
753 set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
756 * If global heartbeat active, unpin all regions if the
757 * region count > CUT_OFF
759 if (bitmap_weight(o2hb_quorum_region_bitmap,
760 O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF)
761 o2hb_region_unpin(NULL);
763 spin_unlock(&o2hb_live_lock);
766 static int o2hb_check_slot(struct o2hb_region *reg,
767 struct o2hb_disk_slot *slot)
769 int changed = 0, gen_changed = 0;
770 struct o2hb_node_event event =
771 { .hn_item = LIST_HEAD_INIT(event.hn_item), };
772 struct o2nm_node *node;
773 struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block;
775 unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS;
776 unsigned int slot_dead_ms;
780 memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes);
783 * If a node is no longer configured but is still in the livemap, we
784 * may need to clear that bit from the livemap.
786 node = o2nm_get_node_by_num(slot->ds_node_num);
788 spin_lock(&o2hb_live_lock);
789 tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap);
790 spin_unlock(&o2hb_live_lock);
795 if (!o2hb_verify_crc(reg, hb_block)) {
796 /* all paths from here will drop o2hb_live_lock for
798 spin_lock(&o2hb_live_lock);
800 /* Don't print an error on the console in this case -
801 * a freshly formatted heartbeat area will not have a
803 if (list_empty(&slot->ds_live_item))
806 /* The node is live but pushed out a bad crc. We
807 * consider it a transient miss but don't populate any
808 * other values as they may be junk. */
809 mlog(ML_ERROR, "Node %d has written a bad crc to %s\n",
810 slot->ds_node_num, reg->hr_dev_name);
811 o2hb_dump_slot(hb_block);
813 slot->ds_equal_samples++;
817 /* we don't care if these wrap.. the state transitions below
818 * clear at the right places */
819 cputime = le64_to_cpu(hb_block->hb_seq);
820 if (slot->ds_last_time != cputime)
821 slot->ds_changed_samples++;
823 slot->ds_equal_samples++;
824 slot->ds_last_time = cputime;
826 /* The node changed heartbeat generations. We assume this to
827 * mean it dropped off but came back before we timed out. We
828 * want to consider it down for the time being but don't want
829 * to lose any changed_samples state we might build up to
830 * considering it live again. */
831 if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) {
833 slot->ds_equal_samples = 0;
834 mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx "
835 "to 0x%llx)\n", slot->ds_node_num,
836 (long long)slot->ds_last_generation,
837 (long long)le64_to_cpu(hb_block->hb_generation));
840 slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
842 mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x "
843 "seq %llu last %llu changed %u equal %u\n",
844 slot->ds_node_num, (long long)slot->ds_last_generation,
845 le32_to_cpu(hb_block->hb_cksum),
846 (unsigned long long)le64_to_cpu(hb_block->hb_seq),
847 (unsigned long long)slot->ds_last_time, slot->ds_changed_samples,
848 slot->ds_equal_samples);
850 spin_lock(&o2hb_live_lock);
853 /* dead nodes only come to life after some number of
854 * changes at any time during their dead time */
855 if (list_empty(&slot->ds_live_item) &&
856 slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) {
857 mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n",
858 slot->ds_node_num, (long long)slot->ds_last_generation);
860 set_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
862 /* first on the list generates a callback */
863 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
864 mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes "
865 "bitmap\n", slot->ds_node_num);
866 set_bit(slot->ds_node_num, o2hb_live_node_bitmap);
868 o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node,
875 list_add_tail(&slot->ds_live_item,
876 &o2hb_live_slots[slot->ds_node_num]);
878 slot->ds_equal_samples = 0;
880 /* We want to be sure that all nodes agree on the
881 * number of milliseconds before a node will be
882 * considered dead. The self-fencing timeout is
883 * computed from this value, and a discrepancy might
884 * result in heartbeat calling a node dead when it
885 * hasn't self-fenced yet. */
886 slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms);
887 if (slot_dead_ms && slot_dead_ms != dead_ms) {
888 /* TODO: Perhaps we can fail the region here. */
889 mlog(ML_ERROR, "Node %d on device %s has a dead count "
890 "of %u ms, but our count is %u ms.\n"
891 "Please double check your configuration values "
892 "for 'O2CB_HEARTBEAT_THRESHOLD'\n",
893 slot->ds_node_num, reg->hr_dev_name, slot_dead_ms,
899 /* if the list is dead, we're done.. */
900 if (list_empty(&slot->ds_live_item))
903 /* live nodes only go dead after enough consequtive missed
904 * samples.. reset the missed counter whenever we see
906 if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) {
907 mlog(ML_HEARTBEAT, "Node %d left my region\n",
910 clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
912 /* last off the live_slot generates a callback */
913 list_del_init(&slot->ds_live_item);
914 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
915 mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live "
916 "nodes bitmap\n", slot->ds_node_num);
917 clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
919 /* node can be null */
920 o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB,
921 node, slot->ds_node_num);
927 /* We don't clear this because the node is still
928 * actually writing new blocks. */
930 slot->ds_changed_samples = 0;
933 if (slot->ds_changed_samples) {
934 slot->ds_changed_samples = 0;
935 slot->ds_equal_samples = 0;
938 spin_unlock(&o2hb_live_lock);
941 o2hb_run_event_list(&event);
948 static int o2hb_highest_node(unsigned long *nodes, int numbits)
950 return find_last_bit(nodes, numbits);
953 static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
955 int i, ret, highest_node;
956 int membership_change = 0, own_slot_ok = 0;
957 unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)];
958 unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
959 struct o2hb_bio_wait_ctxt write_wc;
961 ret = o2nm_configured_node_map(configured_nodes,
962 sizeof(configured_nodes));
969 * If a node is not configured but is in the livemap, we still need
970 * to read the slot so as to be able to remove it from the livemap.
972 o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap));
974 while ((i = find_next_bit(live_node_bitmap,
975 O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
976 set_bit(i, configured_nodes);
979 highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES);
980 if (highest_node >= O2NM_MAX_NODES) {
981 mlog(ML_NOTICE, "o2hb: No configured nodes found!\n");
986 /* No sense in reading the slots of nodes that don't exist
987 * yet. Of course, if the node definitions have holes in them
988 * then we're reading an empty slot anyway... Consider this
990 ret = o2hb_read_slots(reg, highest_node + 1);
996 /* With an up to date view of the slots, we can check that no
997 * other node has been improperly configured to heartbeat in
999 own_slot_ok = o2hb_check_own_slot(reg);
1001 /* fill in the proper info for our next heartbeat */
1002 o2hb_prepare_block(reg, reg->hr_generation);
1004 ret = o2hb_issue_node_write(reg, &write_wc);
1011 while((i = find_next_bit(configured_nodes,
1012 O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
1013 membership_change |= o2hb_check_slot(reg, ®->hr_slots[i]);
1017 * We have to be sure we've advertised ourselves on disk
1018 * before we can go to steady state. This ensures that
1019 * people we find in our steady state have seen us.
1021 o2hb_wait_on_io(reg, &write_wc);
1022 if (write_wc.wc_error) {
1023 /* Do not re-arm the write timeout on I/O error - we
1024 * can't be sure that the new block ever made it to
1026 mlog(ML_ERROR, "Write error %d on device \"%s\"\n",
1027 write_wc.wc_error, reg->hr_dev_name);
1028 ret = write_wc.wc_error;
1032 /* Skip disarming the timeout if own slot has stale/bad data */
1034 o2hb_set_quorum_device(reg);
1035 o2hb_arm_write_timeout(reg);
1039 /* let the person who launched us know when things are steady */
1040 if (atomic_read(®->hr_steady_iterations) != 0) {
1041 if (!ret && own_slot_ok && !membership_change) {
1042 if (atomic_dec_and_test(®->hr_steady_iterations))
1043 wake_up(&o2hb_steady_queue);
1047 if (atomic_read(®->hr_steady_iterations) != 0) {
1048 if (atomic_dec_and_test(®->hr_unsteady_iterations)) {
1049 printk(KERN_NOTICE "o2hb: Unable to stabilize "
1050 "heartbeart on region %s (%s)\n",
1051 config_item_name(®->hr_item),
1053 atomic_set(®->hr_steady_iterations, 0);
1054 reg->hr_aborted_start = 1;
1055 wake_up(&o2hb_steady_queue);
1064 * we ride the region ref that the region dir holds. before the region
1065 * dir is removed and drops it ref it will wait to tear down this
1068 static int o2hb_thread(void *data)
1071 struct o2hb_region *reg = data;
1072 struct o2hb_bio_wait_ctxt write_wc;
1073 ktime_t before_hb, after_hb;
1074 unsigned int elapsed_msec;
1076 mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n");
1078 set_user_nice(current, MIN_NICE);
1081 o2nm_depend_this_node();
1083 while (!kthread_should_stop() &&
1084 !reg->hr_unclean_stop && !reg->hr_aborted_start) {
1085 /* We track the time spent inside
1086 * o2hb_do_disk_heartbeat so that we avoid more than
1087 * hr_timeout_ms between disk writes. On busy systems
1088 * this should result in a heartbeat which is less
1089 * likely to time itself out. */
1090 before_hb = ktime_get_real();
1092 ret = o2hb_do_disk_heartbeat(reg);
1094 after_hb = ktime_get_real();
1096 elapsed_msec = (unsigned int)
1097 ktime_ms_delta(after_hb, before_hb);
1100 "start = %lld, end = %lld, msec = %u, ret = %d\n",
1101 before_hb.tv64, after_hb.tv64, elapsed_msec, ret);
1103 if (!kthread_should_stop() &&
1104 elapsed_msec < reg->hr_timeout_ms) {
1105 /* the kthread api has blocked signals for us so no
1106 * need to record the return value. */
1107 msleep_interruptible(reg->hr_timeout_ms - elapsed_msec);
1111 o2hb_disarm_write_timeout(reg);
1113 /* unclean stop is only used in very bad situation */
1114 for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++)
1115 o2hb_shutdown_slot(®->hr_slots[i]);
1117 /* Explicit down notification - avoid forcing the other nodes
1118 * to timeout on this region when we could just as easily
1119 * write a clear generation - thus indicating to them that
1120 * this node has left this region.
1122 if (!reg->hr_unclean_stop && !reg->hr_aborted_start) {
1123 o2hb_prepare_block(reg, 0);
1124 ret = o2hb_issue_node_write(reg, &write_wc);
1126 o2hb_wait_on_io(reg, &write_wc);
1132 o2nm_undepend_this_node();
1134 mlog(ML_HEARTBEAT|ML_KTHREAD, "o2hb thread exiting\n");
1139 #ifdef CONFIG_DEBUG_FS
1140 static int o2hb_debug_open(struct inode *inode, struct file *file)
1142 struct o2hb_debug_buf *db = inode->i_private;
1143 struct o2hb_region *reg;
1144 unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1150 /* max_nodes should be the largest bitmap we pass here */
1151 BUG_ON(sizeof(map) < db->db_size);
1153 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1157 switch (db->db_type) {
1158 case O2HB_DB_TYPE_LIVENODES:
1159 case O2HB_DB_TYPE_LIVEREGIONS:
1160 case O2HB_DB_TYPE_QUORUMREGIONS:
1161 case O2HB_DB_TYPE_FAILEDREGIONS:
1162 spin_lock(&o2hb_live_lock);
1163 memcpy(map, db->db_data, db->db_size);
1164 spin_unlock(&o2hb_live_lock);
1167 case O2HB_DB_TYPE_REGION_LIVENODES:
1168 spin_lock(&o2hb_live_lock);
1169 reg = (struct o2hb_region *)db->db_data;
1170 memcpy(map, reg->hr_live_node_bitmap, db->db_size);
1171 spin_unlock(&o2hb_live_lock);
1174 case O2HB_DB_TYPE_REGION_NUMBER:
1175 reg = (struct o2hb_region *)db->db_data;
1176 out += snprintf(buf + out, PAGE_SIZE - out, "%d\n",
1177 reg->hr_region_num);
1180 case O2HB_DB_TYPE_REGION_ELAPSED_TIME:
1181 reg = (struct o2hb_region *)db->db_data;
1182 lts = reg->hr_last_timeout_start;
1183 /* If 0, it has never been set before */
1185 lts = jiffies_to_msecs(jiffies - lts);
1186 out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts);
1189 case O2HB_DB_TYPE_REGION_PINNED:
1190 reg = (struct o2hb_region *)db->db_data;
1191 out += snprintf(buf + out, PAGE_SIZE - out, "%u\n",
1192 !!reg->hr_item_pinned);
1199 while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len)
1200 out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
1201 out += snprintf(buf + out, PAGE_SIZE - out, "\n");
1204 i_size_write(inode, out);
1206 file->private_data = buf;
1213 static int o2hb_debug_release(struct inode *inode, struct file *file)
1215 kfree(file->private_data);
1219 static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
1220 size_t nbytes, loff_t *ppos)
1222 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
1223 i_size_read(file->f_mapping->host));
1226 static int o2hb_debug_open(struct inode *inode, struct file *file)
1230 static int o2hb_debug_release(struct inode *inode, struct file *file)
1234 static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
1235 size_t nbytes, loff_t *ppos)
1239 #endif /* CONFIG_DEBUG_FS */
1241 static const struct file_operations o2hb_debug_fops = {
1242 .open = o2hb_debug_open,
1243 .release = o2hb_debug_release,
1244 .read = o2hb_debug_read,
1245 .llseek = generic_file_llseek,
1248 void o2hb_exit(void)
1250 kfree(o2hb_db_livenodes);
1251 kfree(o2hb_db_liveregions);
1252 kfree(o2hb_db_quorumregions);
1253 kfree(o2hb_db_failedregions);
1254 debugfs_remove(o2hb_debug_failedregions);
1255 debugfs_remove(o2hb_debug_quorumregions);
1256 debugfs_remove(o2hb_debug_liveregions);
1257 debugfs_remove(o2hb_debug_livenodes);
1258 debugfs_remove(o2hb_debug_dir);
1261 static struct dentry *o2hb_debug_create(const char *name, struct dentry *dir,
1262 struct o2hb_debug_buf **db, int db_len,
1263 int type, int size, int len, void *data)
1265 *db = kmalloc(db_len, GFP_KERNEL);
1269 (*db)->db_type = type;
1270 (*db)->db_size = size;
1271 (*db)->db_len = len;
1272 (*db)->db_data = data;
1274 return debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db,
1278 static int o2hb_debug_init(void)
1282 o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
1283 if (!o2hb_debug_dir) {
1288 o2hb_debug_livenodes = o2hb_debug_create(O2HB_DEBUG_LIVENODES,
1291 sizeof(*o2hb_db_livenodes),
1292 O2HB_DB_TYPE_LIVENODES,
1293 sizeof(o2hb_live_node_bitmap),
1295 o2hb_live_node_bitmap);
1296 if (!o2hb_debug_livenodes) {
1301 o2hb_debug_liveregions = o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS,
1303 &o2hb_db_liveregions,
1304 sizeof(*o2hb_db_liveregions),
1305 O2HB_DB_TYPE_LIVEREGIONS,
1306 sizeof(o2hb_live_region_bitmap),
1308 o2hb_live_region_bitmap);
1309 if (!o2hb_debug_liveregions) {
1314 o2hb_debug_quorumregions =
1315 o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS,
1317 &o2hb_db_quorumregions,
1318 sizeof(*o2hb_db_quorumregions),
1319 O2HB_DB_TYPE_QUORUMREGIONS,
1320 sizeof(o2hb_quorum_region_bitmap),
1322 o2hb_quorum_region_bitmap);
1323 if (!o2hb_debug_quorumregions) {
1328 o2hb_debug_failedregions =
1329 o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS,
1331 &o2hb_db_failedregions,
1332 sizeof(*o2hb_db_failedregions),
1333 O2HB_DB_TYPE_FAILEDREGIONS,
1334 sizeof(o2hb_failed_region_bitmap),
1336 o2hb_failed_region_bitmap);
1337 if (!o2hb_debug_failedregions) {
1354 for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++)
1355 INIT_LIST_HEAD(&o2hb_callbacks[i].list);
1357 for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++)
1358 INIT_LIST_HEAD(&o2hb_live_slots[i]);
1360 INIT_LIST_HEAD(&o2hb_node_events);
1362 memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
1363 memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap));
1364 memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap));
1365 memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap));
1366 memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap));
1368 o2hb_dependent_users = 0;
1370 return o2hb_debug_init();
1373 /* if we're already in a callback then we're already serialized by the sem */
1374 static void o2hb_fill_node_map_from_callback(unsigned long *map,
1377 BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
1379 memcpy(map, &o2hb_live_node_bitmap, bytes);
1383 * get a map of all nodes that are heartbeating in any regions
1385 void o2hb_fill_node_map(unsigned long *map, unsigned bytes)
1387 /* callers want to serialize this map and callbacks so that they
1388 * can trust that they don't miss nodes coming to the party */
1389 down_read(&o2hb_callback_sem);
1390 spin_lock(&o2hb_live_lock);
1391 o2hb_fill_node_map_from_callback(map, bytes);
1392 spin_unlock(&o2hb_live_lock);
1393 up_read(&o2hb_callback_sem);
1395 EXPORT_SYMBOL_GPL(o2hb_fill_node_map);
1398 * heartbeat configfs bits. The heartbeat set is a default set under
1399 * the cluster set in nodemanager.c.
1402 static struct o2hb_region *to_o2hb_region(struct config_item *item)
1404 return item ? container_of(item, struct o2hb_region, hr_item) : NULL;
1407 /* drop_item only drops its ref after killing the thread, nothing should
1408 * be using the region anymore. this has to clean up any state that
1409 * attributes might have built up. */
1410 static void o2hb_region_release(struct config_item *item)
1414 struct o2hb_region *reg = to_o2hb_region(item);
1416 mlog(ML_HEARTBEAT, "hb region release (%s)\n", reg->hr_dev_name);
1418 kfree(reg->hr_tmp_block);
1420 if (reg->hr_slot_data) {
1421 for (i = 0; i < reg->hr_num_pages; i++) {
1422 page = reg->hr_slot_data[i];
1426 kfree(reg->hr_slot_data);
1430 blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
1432 kfree(reg->hr_slots);
1434 kfree(reg->hr_db_regnum);
1435 kfree(reg->hr_db_livenodes);
1436 debugfs_remove(reg->hr_debug_livenodes);
1437 debugfs_remove(reg->hr_debug_regnum);
1438 debugfs_remove(reg->hr_debug_elapsed_time);
1439 debugfs_remove(reg->hr_debug_pinned);
1440 debugfs_remove(reg->hr_debug_dir);
1442 spin_lock(&o2hb_live_lock);
1443 list_del(®->hr_all_item);
1444 spin_unlock(&o2hb_live_lock);
1449 static int o2hb_read_block_input(struct o2hb_region *reg,
1452 unsigned long *ret_bytes,
1453 unsigned int *ret_bits)
1455 unsigned long bytes;
1456 char *p = (char *)page;
1458 bytes = simple_strtoul(p, &p, 0);
1459 if (!p || (*p && (*p != '\n')))
1462 /* Heartbeat and fs min / max block sizes are the same. */
1463 if (bytes > 4096 || bytes < 512)
1465 if (hweight16(bytes) != 1)
1471 *ret_bits = ffs(bytes) - 1;
1476 static ssize_t o2hb_region_block_bytes_show(struct config_item *item,
1479 return sprintf(page, "%u\n", to_o2hb_region(item)->hr_block_bytes);
1482 static ssize_t o2hb_region_block_bytes_store(struct config_item *item,
1486 struct o2hb_region *reg = to_o2hb_region(item);
1488 unsigned long block_bytes;
1489 unsigned int block_bits;
1494 status = o2hb_read_block_input(reg, page, count,
1495 &block_bytes, &block_bits);
1499 reg->hr_block_bytes = (unsigned int)block_bytes;
1500 reg->hr_block_bits = block_bits;
1505 static ssize_t o2hb_region_start_block_show(struct config_item *item,
1508 return sprintf(page, "%llu\n", to_o2hb_region(item)->hr_start_block);
1511 static ssize_t o2hb_region_start_block_store(struct config_item *item,
1515 struct o2hb_region *reg = to_o2hb_region(item);
1516 unsigned long long tmp;
1517 char *p = (char *)page;
1522 tmp = simple_strtoull(p, &p, 0);
1523 if (!p || (*p && (*p != '\n')))
1526 reg->hr_start_block = tmp;
1531 static ssize_t o2hb_region_blocks_show(struct config_item *item, char *page)
1533 return sprintf(page, "%d\n", to_o2hb_region(item)->hr_blocks);
1536 static ssize_t o2hb_region_blocks_store(struct config_item *item,
1540 struct o2hb_region *reg = to_o2hb_region(item);
1542 char *p = (char *)page;
1547 tmp = simple_strtoul(p, &p, 0);
1548 if (!p || (*p && (*p != '\n')))
1551 if (tmp > O2NM_MAX_NODES || tmp == 0)
1554 reg->hr_blocks = (unsigned int)tmp;
1559 static ssize_t o2hb_region_dev_show(struct config_item *item, char *page)
1561 unsigned int ret = 0;
1563 if (to_o2hb_region(item)->hr_bdev)
1564 ret = sprintf(page, "%s\n", to_o2hb_region(item)->hr_dev_name);
1569 static void o2hb_init_region_params(struct o2hb_region *reg)
1571 reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits;
1572 reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS;
1574 mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n",
1575 reg->hr_start_block, reg->hr_blocks);
1576 mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n",
1577 reg->hr_block_bytes, reg->hr_block_bits);
1578 mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms);
1579 mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold);
1582 static int o2hb_map_slot_data(struct o2hb_region *reg)
1585 unsigned int last_slot;
1586 unsigned int spp = reg->hr_slots_per_page;
1589 struct o2hb_disk_slot *slot;
1591 reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL);
1592 if (reg->hr_tmp_block == NULL)
1595 reg->hr_slots = kcalloc(reg->hr_blocks,
1596 sizeof(struct o2hb_disk_slot), GFP_KERNEL);
1597 if (reg->hr_slots == NULL)
1600 for(i = 0; i < reg->hr_blocks; i++) {
1601 slot = ®->hr_slots[i];
1602 slot->ds_node_num = i;
1603 INIT_LIST_HEAD(&slot->ds_live_item);
1604 slot->ds_raw_block = NULL;
1607 reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp;
1608 mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks "
1609 "at %u blocks per page\n",
1610 reg->hr_num_pages, reg->hr_blocks, spp);
1612 reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *),
1614 if (!reg->hr_slot_data)
1617 for(i = 0; i < reg->hr_num_pages; i++) {
1618 page = alloc_page(GFP_KERNEL);
1622 reg->hr_slot_data[i] = page;
1624 last_slot = i * spp;
1625 raw = page_address(page);
1627 (j < spp) && ((j + last_slot) < reg->hr_blocks);
1629 BUG_ON((j + last_slot) >= reg->hr_blocks);
1631 slot = ®->hr_slots[j + last_slot];
1632 slot->ds_raw_block =
1633 (struct o2hb_disk_heartbeat_block *) raw;
1635 raw += reg->hr_block_bytes;
1642 /* Read in all the slots available and populate the tracking
1643 * structures so that we can start with a baseline idea of what's
1645 static int o2hb_populate_slot_data(struct o2hb_region *reg)
1648 struct o2hb_disk_slot *slot;
1649 struct o2hb_disk_heartbeat_block *hb_block;
1651 ret = o2hb_read_slots(reg, reg->hr_blocks);
1655 /* We only want to get an idea of the values initially in each
1656 * slot, so we do no verification - o2hb_check_slot will
1657 * actually determine if each configured slot is valid and
1658 * whether any values have changed. */
1659 for(i = 0; i < reg->hr_blocks; i++) {
1660 slot = ®->hr_slots[i];
1661 hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block;
1663 /* Only fill the values that o2hb_check_slot uses to
1664 * determine changing slots */
1665 slot->ds_last_time = le64_to_cpu(hb_block->hb_seq);
1666 slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
1673 /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */
1674 static ssize_t o2hb_region_dev_store(struct config_item *item,
1678 struct o2hb_region *reg = to_o2hb_region(item);
1679 struct task_struct *hb_task;
1682 char *p = (char *)page;
1684 struct inode *inode;
1685 ssize_t ret = -EINVAL;
1691 /* We can't heartbeat without having had our node number
1692 * configured yet. */
1693 if (o2nm_this_node() == O2NM_MAX_NODES)
1696 fd = simple_strtol(p, &p, 0);
1697 if (!p || (*p && (*p != '\n')))
1700 if (fd < 0 || fd >= INT_MAX)
1707 if (reg->hr_blocks == 0 || reg->hr_start_block == 0 ||
1708 reg->hr_block_bytes == 0)
1711 inode = igrab(f.file->f_mapping->host);
1715 if (!S_ISBLK(inode->i_mode))
1718 reg->hr_bdev = I_BDEV(f.file->f_mapping->host);
1719 ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, NULL);
1721 reg->hr_bdev = NULL;
1726 bdevname(reg->hr_bdev, reg->hr_dev_name);
1728 sectsize = bdev_logical_block_size(reg->hr_bdev);
1729 if (sectsize != reg->hr_block_bytes) {
1731 "blocksize %u incorrect for device, expected %d",
1732 reg->hr_block_bytes, sectsize);
1737 o2hb_init_region_params(reg);
1739 /* Generation of zero is invalid */
1741 get_random_bytes(®->hr_generation,
1742 sizeof(reg->hr_generation));
1743 } while (reg->hr_generation == 0);
1745 ret = o2hb_map_slot_data(reg);
1751 ret = o2hb_populate_slot_data(reg);
1757 INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout);
1760 * A node is considered live after it has beat LIVE_THRESHOLD
1761 * times. We're not steady until we've given them a chance
1762 * _after_ our first read.
1763 * The default threshold is bare minimum so as to limit the delay
1764 * during mounts. For global heartbeat, the threshold doubled for the
1767 live_threshold = O2HB_LIVE_THRESHOLD;
1768 if (o2hb_global_heartbeat_active()) {
1769 spin_lock(&o2hb_live_lock);
1770 if (bitmap_weight(o2hb_region_bitmap, O2NM_MAX_REGIONS) == 1)
1771 live_threshold <<= 1;
1772 spin_unlock(&o2hb_live_lock);
1775 atomic_set(®->hr_steady_iterations, live_threshold);
1776 /* unsteady_iterations is double the steady_iterations */
1777 atomic_set(®->hr_unsteady_iterations, (live_threshold << 1));
1779 hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s",
1780 reg->hr_item.ci_name);
1781 if (IS_ERR(hb_task)) {
1782 ret = PTR_ERR(hb_task);
1787 spin_lock(&o2hb_live_lock);
1788 reg->hr_task = hb_task;
1789 spin_unlock(&o2hb_live_lock);
1791 ret = wait_event_interruptible(o2hb_steady_queue,
1792 atomic_read(®->hr_steady_iterations) == 0);
1794 atomic_set(®->hr_steady_iterations, 0);
1795 reg->hr_aborted_start = 1;
1798 if (reg->hr_aborted_start) {
1803 /* Ok, we were woken. Make sure it wasn't by drop_item() */
1804 spin_lock(&o2hb_live_lock);
1805 hb_task = reg->hr_task;
1806 if (o2hb_global_heartbeat_active())
1807 set_bit(reg->hr_region_num, o2hb_live_region_bitmap);
1808 spin_unlock(&o2hb_live_lock);
1815 if (hb_task && o2hb_global_heartbeat_active())
1816 printk(KERN_NOTICE "o2hb: Heartbeat started on region %s (%s)\n",
1817 config_item_name(®->hr_item), reg->hr_dev_name);
1826 blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
1827 reg->hr_bdev = NULL;
1833 static ssize_t o2hb_region_pid_show(struct config_item *item, char *page)
1835 struct o2hb_region *reg = to_o2hb_region(item);
1838 spin_lock(&o2hb_live_lock);
1840 pid = task_pid_nr(reg->hr_task);
1841 spin_unlock(&o2hb_live_lock);
1846 return sprintf(page, "%u\n", pid);
1849 CONFIGFS_ATTR(o2hb_region_, block_bytes);
1850 CONFIGFS_ATTR(o2hb_region_, start_block);
1851 CONFIGFS_ATTR(o2hb_region_, blocks);
1852 CONFIGFS_ATTR(o2hb_region_, dev);
1853 CONFIGFS_ATTR_RO(o2hb_region_, pid);
1855 static struct configfs_attribute *o2hb_region_attrs[] = {
1856 &o2hb_region_attr_block_bytes,
1857 &o2hb_region_attr_start_block,
1858 &o2hb_region_attr_blocks,
1859 &o2hb_region_attr_dev,
1860 &o2hb_region_attr_pid,
1864 static struct configfs_item_operations o2hb_region_item_ops = {
1865 .release = o2hb_region_release,
1868 static struct config_item_type o2hb_region_type = {
1869 .ct_item_ops = &o2hb_region_item_ops,
1870 .ct_attrs = o2hb_region_attrs,
1871 .ct_owner = THIS_MODULE,
1876 struct o2hb_heartbeat_group {
1877 struct config_group hs_group;
1881 static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group)
1884 container_of(group, struct o2hb_heartbeat_group, hs_group)
1888 static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
1893 debugfs_create_dir(config_item_name(®->hr_item), dir);
1894 if (!reg->hr_debug_dir) {
1899 reg->hr_debug_livenodes =
1900 o2hb_debug_create(O2HB_DEBUG_LIVENODES,
1902 &(reg->hr_db_livenodes),
1903 sizeof(*(reg->hr_db_livenodes)),
1904 O2HB_DB_TYPE_REGION_LIVENODES,
1905 sizeof(reg->hr_live_node_bitmap),
1906 O2NM_MAX_NODES, reg);
1907 if (!reg->hr_debug_livenodes) {
1912 reg->hr_debug_regnum =
1913 o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER,
1915 &(reg->hr_db_regnum),
1916 sizeof(*(reg->hr_db_regnum)),
1917 O2HB_DB_TYPE_REGION_NUMBER,
1918 0, O2NM_MAX_NODES, reg);
1919 if (!reg->hr_debug_regnum) {
1924 reg->hr_debug_elapsed_time =
1925 o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME,
1927 &(reg->hr_db_elapsed_time),
1928 sizeof(*(reg->hr_db_elapsed_time)),
1929 O2HB_DB_TYPE_REGION_ELAPSED_TIME,
1931 if (!reg->hr_debug_elapsed_time) {
1936 reg->hr_debug_pinned =
1937 o2hb_debug_create(O2HB_DEBUG_REGION_PINNED,
1939 &(reg->hr_db_pinned),
1940 sizeof(*(reg->hr_db_pinned)),
1941 O2HB_DB_TYPE_REGION_PINNED,
1943 if (!reg->hr_debug_pinned) {
1953 static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group,
1956 struct o2hb_region *reg = NULL;
1959 reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL);
1961 return ERR_PTR(-ENOMEM);
1963 if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) {
1964 ret = -ENAMETOOLONG;
1968 spin_lock(&o2hb_live_lock);
1969 reg->hr_region_num = 0;
1970 if (o2hb_global_heartbeat_active()) {
1971 reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap,
1973 if (reg->hr_region_num >= O2NM_MAX_REGIONS) {
1974 spin_unlock(&o2hb_live_lock);
1978 set_bit(reg->hr_region_num, o2hb_region_bitmap);
1980 list_add_tail(®->hr_all_item, &o2hb_all_regions);
1981 spin_unlock(&o2hb_live_lock);
1983 config_item_init_type_name(®->hr_item, name, &o2hb_region_type);
1985 ret = o2hb_debug_region_init(reg, o2hb_debug_dir);
1987 config_item_put(®->hr_item);
1991 return ®->hr_item;
1994 return ERR_PTR(ret);
1997 static void o2hb_heartbeat_group_drop_item(struct config_group *group,
1998 struct config_item *item)
2000 struct task_struct *hb_task;
2001 struct o2hb_region *reg = to_o2hb_region(item);
2002 int quorum_region = 0;
2004 /* stop the thread when the user removes the region dir */
2005 spin_lock(&o2hb_live_lock);
2006 hb_task = reg->hr_task;
2007 reg->hr_task = NULL;
2008 reg->hr_item_dropped = 1;
2009 spin_unlock(&o2hb_live_lock);
2012 kthread_stop(hb_task);
2014 if (o2hb_global_heartbeat_active()) {
2015 spin_lock(&o2hb_live_lock);
2016 clear_bit(reg->hr_region_num, o2hb_region_bitmap);
2017 clear_bit(reg->hr_region_num, o2hb_live_region_bitmap);
2018 if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
2020 clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
2021 spin_unlock(&o2hb_live_lock);
2022 printk(KERN_NOTICE "o2hb: Heartbeat %s on region %s (%s)\n",
2023 ((atomic_read(®->hr_steady_iterations) == 0) ?
2024 "stopped" : "start aborted"), config_item_name(item),
2029 * If we're racing a dev_write(), we need to wake them. They will
2030 * check reg->hr_task
2032 if (atomic_read(®->hr_steady_iterations) != 0) {
2033 reg->hr_aborted_start = 1;
2034 atomic_set(®->hr_steady_iterations, 0);
2035 wake_up(&o2hb_steady_queue);
2038 config_item_put(item);
2040 if (!o2hb_global_heartbeat_active() || !quorum_region)
2044 * If global heartbeat active and there are dependent users,
2045 * pin all regions if quorum region count <= CUT_OFF
2047 spin_lock(&o2hb_live_lock);
2049 if (!o2hb_dependent_users)
2052 if (bitmap_weight(o2hb_quorum_region_bitmap,
2053 O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
2054 o2hb_region_pin(NULL);
2057 spin_unlock(&o2hb_live_lock);
2060 static ssize_t o2hb_heartbeat_group_threshold_show(struct config_item *item,
2063 return sprintf(page, "%u\n", o2hb_dead_threshold);
2066 static ssize_t o2hb_heartbeat_group_threshold_store(struct config_item *item,
2067 const char *page, size_t count)
2070 char *p = (char *)page;
2072 tmp = simple_strtoul(p, &p, 10);
2073 if (!p || (*p && (*p != '\n')))
2076 /* this will validate ranges for us. */
2077 o2hb_dead_threshold_set((unsigned int) tmp);
2082 static ssize_t o2hb_heartbeat_group_mode_show(struct config_item *item,
2085 return sprintf(page, "%s\n",
2086 o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]);
2089 static ssize_t o2hb_heartbeat_group_mode_store(struct config_item *item,
2090 const char *page, size_t count)
2096 len = (page[count - 1] == '\n') ? count - 1 : count;
2100 for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) {
2101 if (strncasecmp(page, o2hb_heartbeat_mode_desc[i], len))
2104 ret = o2hb_global_heartbeat_mode_set(i);
2106 printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n",
2107 o2hb_heartbeat_mode_desc[i]);
2115 CONFIGFS_ATTR(o2hb_heartbeat_group_, threshold);
2116 CONFIGFS_ATTR(o2hb_heartbeat_group_, mode);
2118 static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = {
2119 &o2hb_heartbeat_group_attr_threshold,
2120 &o2hb_heartbeat_group_attr_mode,
2124 static struct configfs_group_operations o2hb_heartbeat_group_group_ops = {
2125 .make_item = o2hb_heartbeat_group_make_item,
2126 .drop_item = o2hb_heartbeat_group_drop_item,
2129 static struct config_item_type o2hb_heartbeat_group_type = {
2130 .ct_group_ops = &o2hb_heartbeat_group_group_ops,
2131 .ct_attrs = o2hb_heartbeat_group_attrs,
2132 .ct_owner = THIS_MODULE,
2135 /* this is just here to avoid touching group in heartbeat.h which the
2136 * entire damn world #includes */
2137 struct config_group *o2hb_alloc_hb_set(void)
2139 struct o2hb_heartbeat_group *hs = NULL;
2140 struct config_group *ret = NULL;
2142 hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL);
2146 config_group_init_type_name(&hs->hs_group, "heartbeat",
2147 &o2hb_heartbeat_group_type);
2149 ret = &hs->hs_group;
2156 void o2hb_free_hb_set(struct config_group *group)
2158 struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group);
2162 /* hb callback registration and issuing */
2164 static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type)
2166 if (type == O2HB_NUM_CB)
2167 return ERR_PTR(-EINVAL);
2169 return &o2hb_callbacks[type];
2172 void o2hb_setup_callback(struct o2hb_callback_func *hc,
2173 enum o2hb_callback_type type,
2178 INIT_LIST_HEAD(&hc->hc_item);
2181 hc->hc_priority = priority;
2183 hc->hc_magic = O2HB_CB_MAGIC;
2185 EXPORT_SYMBOL_GPL(o2hb_setup_callback);
2188 * In local heartbeat mode, region_uuid passed matches the dlm domain name.
2189 * In global heartbeat mode, region_uuid passed is NULL.
2191 * In local, we only pin the matching region. In global we pin all the active
2194 static int o2hb_region_pin(const char *region_uuid)
2196 int ret = 0, found = 0;
2197 struct o2hb_region *reg;
2200 assert_spin_locked(&o2hb_live_lock);
2202 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2203 if (reg->hr_item_dropped)
2206 uuid = config_item_name(®->hr_item);
2208 /* local heartbeat */
2210 if (strcmp(region_uuid, uuid))
2215 if (reg->hr_item_pinned || reg->hr_item_dropped)
2218 /* Ignore ENOENT only for local hb (userdlm domain) */
2219 ret = o2nm_depend_item(®->hr_item);
2221 mlog(ML_CLUSTER, "Pin region %s\n", uuid);
2222 reg->hr_item_pinned = 1;
2224 if (ret == -ENOENT && found)
2227 mlog(ML_ERROR, "Pin region %s fails with %d\n",
2241 * In local heartbeat mode, region_uuid passed matches the dlm domain name.
2242 * In global heartbeat mode, region_uuid passed is NULL.
2244 * In local, we only unpin the matching region. In global we unpin all the
2247 static void o2hb_region_unpin(const char *region_uuid)
2249 struct o2hb_region *reg;
2253 assert_spin_locked(&o2hb_live_lock);
2255 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2256 if (reg->hr_item_dropped)
2259 uuid = config_item_name(®->hr_item);
2261 if (strcmp(region_uuid, uuid))
2266 if (reg->hr_item_pinned) {
2267 mlog(ML_CLUSTER, "Unpin region %s\n", uuid);
2268 o2nm_undepend_item(®->hr_item);
2269 reg->hr_item_pinned = 0;
2276 static int o2hb_region_inc_user(const char *region_uuid)
2280 spin_lock(&o2hb_live_lock);
2282 /* local heartbeat */
2283 if (!o2hb_global_heartbeat_active()) {
2284 ret = o2hb_region_pin(region_uuid);
2289 * if global heartbeat active and this is the first dependent user,
2290 * pin all regions if quorum region count <= CUT_OFF
2292 o2hb_dependent_users++;
2293 if (o2hb_dependent_users > 1)
2296 if (bitmap_weight(o2hb_quorum_region_bitmap,
2297 O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
2298 ret = o2hb_region_pin(NULL);
2301 spin_unlock(&o2hb_live_lock);
2305 void o2hb_region_dec_user(const char *region_uuid)
2307 spin_lock(&o2hb_live_lock);
2309 /* local heartbeat */
2310 if (!o2hb_global_heartbeat_active()) {
2311 o2hb_region_unpin(region_uuid);
2316 * if global heartbeat active and there are no dependent users,
2317 * unpin all quorum regions
2319 o2hb_dependent_users--;
2320 if (!o2hb_dependent_users)
2321 o2hb_region_unpin(NULL);
2324 spin_unlock(&o2hb_live_lock);
2327 int o2hb_register_callback(const char *region_uuid,
2328 struct o2hb_callback_func *hc)
2330 struct o2hb_callback_func *f;
2331 struct o2hb_callback *hbcall;
2334 BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
2335 BUG_ON(!list_empty(&hc->hc_item));
2337 hbcall = hbcall_from_type(hc->hc_type);
2338 if (IS_ERR(hbcall)) {
2339 ret = PTR_ERR(hbcall);
2344 ret = o2hb_region_inc_user(region_uuid);
2351 down_write(&o2hb_callback_sem);
2353 list_for_each_entry(f, &hbcall->list, hc_item) {
2354 if (hc->hc_priority < f->hc_priority) {
2355 list_add_tail(&hc->hc_item, &f->hc_item);
2359 if (list_empty(&hc->hc_item))
2360 list_add_tail(&hc->hc_item, &hbcall->list);
2362 up_write(&o2hb_callback_sem);
2365 mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n",
2366 ret, __builtin_return_address(0), hc);
2369 EXPORT_SYMBOL_GPL(o2hb_register_callback);
2371 void o2hb_unregister_callback(const char *region_uuid,
2372 struct o2hb_callback_func *hc)
2374 BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
2376 mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n",
2377 __builtin_return_address(0), hc);
2379 /* XXX Can this happen _with_ a region reference? */
2380 if (list_empty(&hc->hc_item))
2384 o2hb_region_dec_user(region_uuid);
2386 down_write(&o2hb_callback_sem);
2388 list_del_init(&hc->hc_item);
2390 up_write(&o2hb_callback_sem);
2392 EXPORT_SYMBOL_GPL(o2hb_unregister_callback);
2394 int o2hb_check_node_heartbeating(u8 node_num)
2396 unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
2398 o2hb_fill_node_map(testing_map, sizeof(testing_map));
2399 if (!test_bit(node_num, testing_map)) {
2401 "node (%u) does not have heartbeating enabled.\n",
2408 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating);
2410 int o2hb_check_node_heartbeating_no_sem(u8 node_num)
2412 unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
2413 unsigned long flags;
2415 spin_lock_irqsave(&o2hb_live_lock, flags);
2416 o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map));
2417 spin_unlock_irqrestore(&o2hb_live_lock, flags);
2418 if (!test_bit(node_num, testing_map)) {
2420 "node (%u) does not have heartbeating enabled.\n",
2427 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_no_sem);
2429 int o2hb_check_node_heartbeating_from_callback(u8 node_num)
2431 unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
2433 o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map));
2434 if (!test_bit(node_num, testing_map)) {
2436 "node (%u) does not have heartbeating enabled.\n",
2443 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback);
2445 /* Makes sure our local node is configured with a node number, and is
2447 int o2hb_check_local_node_heartbeating(void)
2451 /* if this node was set then we have networking */
2452 node_num = o2nm_this_node();
2453 if (node_num == O2NM_MAX_NODES) {
2454 mlog(ML_HEARTBEAT, "this node has not been configured.\n");
2458 return o2hb_check_node_heartbeating(node_num);
2460 EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating);
2463 * this is just a hack until we get the plumbing which flips file systems
2464 * read only and drops the hb ref instead of killing the node dead.
2466 void o2hb_stop_all_regions(void)
2468 struct o2hb_region *reg;
2470 mlog(ML_ERROR, "stopping heartbeat on all active regions.\n");
2472 spin_lock(&o2hb_live_lock);
2474 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item)
2475 reg->hr_unclean_stop = 1;
2477 spin_unlock(&o2hb_live_lock);
2479 EXPORT_SYMBOL_GPL(o2hb_stop_all_regions);
2481 int o2hb_get_all_regions(char *region_uuids, u8 max_regions)
2483 struct o2hb_region *reg;
2487 spin_lock(&o2hb_live_lock);
2490 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2491 if (reg->hr_item_dropped)
2494 mlog(0, "Region: %s\n", config_item_name(®->hr_item));
2495 if (numregs < max_regions) {
2496 memcpy(p, config_item_name(®->hr_item),
2497 O2HB_MAX_REGION_NAME_LEN);
2498 p += O2HB_MAX_REGION_NAME_LEN;
2503 spin_unlock(&o2hb_live_lock);
2507 EXPORT_SYMBOL_GPL(o2hb_get_all_regions);
2509 int o2hb_global_heartbeat_active(void)
2511 return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL);
2513 EXPORT_SYMBOL(o2hb_global_heartbeat_active);