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>
39 #include "heartbeat.h"
41 #include "nodemanager.h"
48 * The first heartbeat pass had one global thread that would serialize all hb
49 * callback calls. This global serializing sem should only be removed once
50 * we've made sure that all callees can deal with being called concurrently
51 * from multiple hb region threads.
53 static DECLARE_RWSEM(o2hb_callback_sem);
56 * multiple hb threads are watching multiple regions. A node is live
57 * whenever any of the threads sees activity from the node in its region.
59 static DEFINE_SPINLOCK(o2hb_live_lock);
60 static struct list_head o2hb_live_slots[O2NM_MAX_NODES];
61 static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
62 static LIST_HEAD(o2hb_node_events);
63 static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue);
66 * In global heartbeat, we maintain a series of region bitmaps.
67 * - o2hb_region_bitmap allows us to limit the region number to max region.
68 * - o2hb_live_region_bitmap tracks live regions (seen steady iterations).
69 * - o2hb_quorum_region_bitmap tracks live regions that have seen all nodes
71 * - o2hb_failed_region_bitmap tracks the regions that have seen io timeouts.
73 static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
74 static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
75 static unsigned long o2hb_quorum_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
76 static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
78 #define O2HB_DB_TYPE_LIVENODES 0
79 #define O2HB_DB_TYPE_LIVEREGIONS 1
80 #define O2HB_DB_TYPE_QUORUMREGIONS 2
81 #define O2HB_DB_TYPE_FAILEDREGIONS 3
82 #define O2HB_DB_TYPE_REGION_LIVENODES 4
83 #define O2HB_DB_TYPE_REGION_NUMBER 5
84 #define O2HB_DB_TYPE_REGION_ELAPSED_TIME 6
85 #define O2HB_DB_TYPE_REGION_PINNED 7
86 struct o2hb_debug_buf {
93 static struct o2hb_debug_buf *o2hb_db_livenodes;
94 static struct o2hb_debug_buf *o2hb_db_liveregions;
95 static struct o2hb_debug_buf *o2hb_db_quorumregions;
96 static struct o2hb_debug_buf *o2hb_db_failedregions;
98 #define O2HB_DEBUG_DIR "o2hb"
99 #define O2HB_DEBUG_LIVENODES "livenodes"
100 #define O2HB_DEBUG_LIVEREGIONS "live_regions"
101 #define O2HB_DEBUG_QUORUMREGIONS "quorum_regions"
102 #define O2HB_DEBUG_FAILEDREGIONS "failed_regions"
103 #define O2HB_DEBUG_REGION_NUMBER "num"
104 #define O2HB_DEBUG_REGION_ELAPSED_TIME "elapsed_time_in_ms"
105 #define O2HB_DEBUG_REGION_PINNED "pinned"
107 static struct dentry *o2hb_debug_dir;
108 static struct dentry *o2hb_debug_livenodes;
109 static struct dentry *o2hb_debug_liveregions;
110 static struct dentry *o2hb_debug_quorumregions;
111 static struct dentry *o2hb_debug_failedregions;
113 static LIST_HEAD(o2hb_all_regions);
115 static struct o2hb_callback {
116 struct list_head list;
117 } o2hb_callbacks[O2HB_NUM_CB];
119 static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type);
121 #define O2HB_DEFAULT_BLOCK_BITS 9
123 enum o2hb_heartbeat_modes {
124 O2HB_HEARTBEAT_LOCAL = 0,
125 O2HB_HEARTBEAT_GLOBAL,
126 O2HB_HEARTBEAT_NUM_MODES,
129 char *o2hb_heartbeat_mode_desc[O2HB_HEARTBEAT_NUM_MODES] = {
130 "local", /* O2HB_HEARTBEAT_LOCAL */
131 "global", /* O2HB_HEARTBEAT_GLOBAL */
134 unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD;
135 unsigned int o2hb_heartbeat_mode = O2HB_HEARTBEAT_LOCAL;
138 * o2hb_dependent_users tracks the number of registered callbacks that depend
139 * on heartbeat. o2net and o2dlm are two entities that register this callback.
140 * However only o2dlm depends on the heartbeat. It does not want the heartbeat
141 * to stop while a dlm domain is still active.
143 unsigned int o2hb_dependent_users;
146 * In global heartbeat mode, all regions are pinned if there are one or more
147 * dependent users and the quorum region count is <= O2HB_PIN_CUT_OFF. All
148 * regions are unpinned if the region count exceeds the cut off or the number
149 * of dependent users falls to zero.
151 #define O2HB_PIN_CUT_OFF 3
154 * In local heartbeat mode, we assume the dlm domain name to be the same as
155 * region uuid. This is true for domains created for the file system but not
156 * necessarily true for userdlm domains. This is a known limitation.
158 * In global heartbeat mode, we pin/unpin all o2hb regions. This solution
159 * works for both file system and userdlm domains.
161 static int o2hb_region_pin(const char *region_uuid);
162 static void o2hb_region_unpin(const char *region_uuid);
164 /* Only sets a new threshold if there are no active regions.
166 * No locking or otherwise interesting code is required for reading
167 * o2hb_dead_threshold as it can't change once regions are active and
168 * it's not interesting to anyone until then anyway. */
169 static void o2hb_dead_threshold_set(unsigned int threshold)
171 if (threshold > O2HB_MIN_DEAD_THRESHOLD) {
172 spin_lock(&o2hb_live_lock);
173 if (list_empty(&o2hb_all_regions))
174 o2hb_dead_threshold = threshold;
175 spin_unlock(&o2hb_live_lock);
179 static int o2hb_global_hearbeat_mode_set(unsigned int hb_mode)
183 if (hb_mode < O2HB_HEARTBEAT_NUM_MODES) {
184 spin_lock(&o2hb_live_lock);
185 if (list_empty(&o2hb_all_regions)) {
186 o2hb_heartbeat_mode = hb_mode;
189 spin_unlock(&o2hb_live_lock);
195 struct o2hb_node_event {
196 struct list_head hn_item;
197 enum o2hb_callback_type hn_event_type;
198 struct o2nm_node *hn_node;
202 struct o2hb_disk_slot {
203 struct o2hb_disk_heartbeat_block *ds_raw_block;
206 u64 ds_last_generation;
207 u16 ds_equal_samples;
208 u16 ds_changed_samples;
209 struct list_head ds_live_item;
212 /* each thread owns a region.. when we're asked to tear down the region
213 * we ask the thread to stop, who cleans up the region */
215 struct config_item hr_item;
217 struct list_head hr_all_item;
218 unsigned hr_unclean_stop:1,
222 /* protected by the hr_callback_sem */
223 struct task_struct *hr_task;
225 unsigned int hr_blocks;
226 unsigned long long hr_start_block;
228 unsigned int hr_block_bits;
229 unsigned int hr_block_bytes;
231 unsigned int hr_slots_per_page;
232 unsigned int hr_num_pages;
234 struct page **hr_slot_data;
235 struct block_device *hr_bdev;
236 struct o2hb_disk_slot *hr_slots;
238 /* live node map of this region */
239 unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
240 unsigned int hr_region_num;
242 struct dentry *hr_debug_dir;
243 struct dentry *hr_debug_livenodes;
244 struct dentry *hr_debug_regnum;
245 struct dentry *hr_debug_elapsed_time;
246 struct dentry *hr_debug_pinned;
247 struct o2hb_debug_buf *hr_db_livenodes;
248 struct o2hb_debug_buf *hr_db_regnum;
249 struct o2hb_debug_buf *hr_db_elapsed_time;
250 struct o2hb_debug_buf *hr_db_pinned;
252 /* let the person setting up hb wait for it to return until it
253 * has reached a 'steady' state. This will be fixed when we have
254 * a more complete api that doesn't lead to this sort of fragility. */
255 atomic_t hr_steady_iterations;
257 char hr_dev_name[BDEVNAME_SIZE];
259 unsigned int hr_timeout_ms;
261 /* randomized as the region goes up and down so that a node
262 * recognizes a node going up and down in one iteration */
265 struct delayed_work hr_write_timeout_work;
266 unsigned long hr_last_timeout_start;
268 /* Used during o2hb_check_slot to hold a copy of the block
269 * being checked because we temporarily have to zero out the
271 struct o2hb_disk_heartbeat_block *hr_tmp_block;
274 struct o2hb_bio_wait_ctxt {
275 atomic_t wc_num_reqs;
276 struct completion wc_io_complete;
280 static int o2hb_pop_count(void *map, int count)
284 while ((i = find_next_bit(map, count, i + 1)) < count)
289 static void o2hb_write_timeout(struct work_struct *work)
293 struct o2hb_region *reg =
294 container_of(work, struct o2hb_region,
295 hr_write_timeout_work.work);
297 mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u "
298 "milliseconds\n", reg->hr_dev_name,
299 jiffies_to_msecs(jiffies - reg->hr_last_timeout_start));
301 if (o2hb_global_heartbeat_active()) {
302 spin_lock_irqsave(&o2hb_live_lock, flags);
303 if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
304 set_bit(reg->hr_region_num, o2hb_failed_region_bitmap);
305 failed = o2hb_pop_count(&o2hb_failed_region_bitmap,
307 quorum = o2hb_pop_count(&o2hb_quorum_region_bitmap,
309 spin_unlock_irqrestore(&o2hb_live_lock, flags);
311 mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n",
315 * Fence if the number of failed regions >= half the number
318 if ((failed << 1) < quorum)
322 o2quo_disk_timeout();
325 static void o2hb_arm_write_timeout(struct o2hb_region *reg)
327 mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n",
328 O2HB_MAX_WRITE_TIMEOUT_MS);
330 if (o2hb_global_heartbeat_active()) {
331 spin_lock(&o2hb_live_lock);
332 clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap);
333 spin_unlock(&o2hb_live_lock);
335 cancel_delayed_work(®->hr_write_timeout_work);
336 reg->hr_last_timeout_start = jiffies;
337 schedule_delayed_work(®->hr_write_timeout_work,
338 msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS));
341 static void o2hb_disarm_write_timeout(struct o2hb_region *reg)
343 cancel_delayed_work_sync(®->hr_write_timeout_work);
346 static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc)
348 atomic_set(&wc->wc_num_reqs, 1);
349 init_completion(&wc->wc_io_complete);
353 /* Used in error paths too */
354 static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc,
357 /* sadly atomic_sub_and_test() isn't available on all platforms. The
358 * good news is that the fast path only completes one at a time */
360 if (atomic_dec_and_test(&wc->wc_num_reqs)) {
362 complete(&wc->wc_io_complete);
367 static void o2hb_wait_on_io(struct o2hb_region *reg,
368 struct o2hb_bio_wait_ctxt *wc)
370 struct address_space *mapping = reg->hr_bdev->bd_inode->i_mapping;
372 blk_run_address_space(mapping);
373 o2hb_bio_wait_dec(wc, 1);
375 wait_for_completion(&wc->wc_io_complete);
378 static void o2hb_bio_end_io(struct bio *bio,
381 struct o2hb_bio_wait_ctxt *wc = bio->bi_private;
384 mlog(ML_ERROR, "IO Error %d\n", error);
385 wc->wc_error = error;
388 o2hb_bio_wait_dec(wc, 1);
392 /* Setup a Bio to cover I/O against num_slots slots starting at
394 static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg,
395 struct o2hb_bio_wait_ctxt *wc,
396 unsigned int *current_slot,
397 unsigned int max_slots)
399 int len, current_page;
400 unsigned int vec_len, vec_start;
401 unsigned int bits = reg->hr_block_bits;
402 unsigned int spp = reg->hr_slots_per_page;
403 unsigned int cs = *current_slot;
407 /* Testing has shown this allocation to take long enough under
408 * GFP_KERNEL that the local node can get fenced. It would be
409 * nicest if we could pre-allocate these bios and avoid this
411 bio = bio_alloc(GFP_ATOMIC, 16);
413 mlog(ML_ERROR, "Could not alloc slots BIO!\n");
414 bio = ERR_PTR(-ENOMEM);
418 /* Must put everything in 512 byte sectors for the bio... */
419 bio->bi_sector = (reg->hr_start_block + cs) << (bits - 9);
420 bio->bi_bdev = reg->hr_bdev;
421 bio->bi_private = wc;
422 bio->bi_end_io = o2hb_bio_end_io;
424 vec_start = (cs << bits) % PAGE_CACHE_SIZE;
425 while(cs < max_slots) {
426 current_page = cs / spp;
427 page = reg->hr_slot_data[current_page];
429 vec_len = min(PAGE_CACHE_SIZE - vec_start,
430 (max_slots-cs) * (PAGE_CACHE_SIZE/spp) );
432 mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n",
433 current_page, vec_len, vec_start);
435 len = bio_add_page(bio, page, vec_len, vec_start);
436 if (len != vec_len) break;
438 cs += vec_len / (PAGE_CACHE_SIZE/spp);
447 static int o2hb_read_slots(struct o2hb_region *reg,
448 unsigned int max_slots)
450 unsigned int current_slot=0;
452 struct o2hb_bio_wait_ctxt wc;
455 o2hb_bio_wait_init(&wc);
457 while(current_slot < max_slots) {
458 bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots);
460 status = PTR_ERR(bio);
465 atomic_inc(&wc.wc_num_reqs);
466 submit_bio(READ, bio);
472 o2hb_wait_on_io(reg, &wc);
473 if (wc.wc_error && !status)
474 status = wc.wc_error;
479 static int o2hb_issue_node_write(struct o2hb_region *reg,
480 struct o2hb_bio_wait_ctxt *write_wc)
486 o2hb_bio_wait_init(write_wc);
488 slot = o2nm_this_node();
490 bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1);
492 status = PTR_ERR(bio);
497 atomic_inc(&write_wc->wc_num_reqs);
498 submit_bio(WRITE, bio);
505 static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg,
506 struct o2hb_disk_heartbeat_block *hb_block)
511 /* We want to compute the block crc with a 0 value in the
512 * hb_cksum field. Save it off here and replace after the
514 old_cksum = hb_block->hb_cksum;
515 hb_block->hb_cksum = 0;
517 ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes);
519 hb_block->hb_cksum = old_cksum;
524 static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block)
526 mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, "
527 "cksum = 0x%x, generation 0x%llx\n",
528 (long long)le64_to_cpu(hb_block->hb_seq),
529 hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum),
530 (long long)le64_to_cpu(hb_block->hb_generation));
533 static int o2hb_verify_crc(struct o2hb_region *reg,
534 struct o2hb_disk_heartbeat_block *hb_block)
538 read = le32_to_cpu(hb_block->hb_cksum);
539 computed = o2hb_compute_block_crc_le(reg, hb_block);
541 return read == computed;
544 /* We want to make sure that nobody is heartbeating on top of us --
545 * this will help detect an invalid configuration. */
546 static int o2hb_check_last_timestamp(struct o2hb_region *reg)
549 struct o2hb_disk_slot *slot;
550 struct o2hb_disk_heartbeat_block *hb_block;
552 node_num = o2nm_this_node();
555 slot = ®->hr_slots[node_num];
556 /* Don't check on our 1st timestamp */
557 if (slot->ds_last_time) {
558 hb_block = slot->ds_raw_block;
560 if (le64_to_cpu(hb_block->hb_seq) != slot->ds_last_time)
567 static inline void o2hb_prepare_block(struct o2hb_region *reg,
572 struct o2hb_disk_slot *slot;
573 struct o2hb_disk_heartbeat_block *hb_block;
575 node_num = o2nm_this_node();
576 slot = ®->hr_slots[node_num];
578 hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block;
579 memset(hb_block, 0, reg->hr_block_bytes);
580 /* TODO: time stuff */
581 cputime = CURRENT_TIME.tv_sec;
585 hb_block->hb_seq = cpu_to_le64(cputime);
586 hb_block->hb_node = node_num;
587 hb_block->hb_generation = cpu_to_le64(generation);
588 hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS);
590 /* This step must always happen last! */
591 hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg,
594 mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n",
595 (long long)generation,
596 le32_to_cpu(hb_block->hb_cksum));
599 static void o2hb_fire_callbacks(struct o2hb_callback *hbcall,
600 struct o2nm_node *node,
603 struct list_head *iter;
604 struct o2hb_callback_func *f;
606 list_for_each(iter, &hbcall->list) {
607 f = list_entry(iter, struct o2hb_callback_func, hc_item);
608 mlog(ML_HEARTBEAT, "calling funcs %p\n", f);
609 (f->hc_func)(node, idx, f->hc_data);
613 /* Will run the list in order until we process the passed event */
614 static void o2hb_run_event_list(struct o2hb_node_event *queued_event)
617 struct o2hb_callback *hbcall;
618 struct o2hb_node_event *event;
620 spin_lock(&o2hb_live_lock);
621 empty = list_empty(&queued_event->hn_item);
622 spin_unlock(&o2hb_live_lock);
626 /* Holding callback sem assures we don't alter the callback
627 * lists when doing this, and serializes ourselves with other
628 * processes wanting callbacks. */
629 down_write(&o2hb_callback_sem);
631 spin_lock(&o2hb_live_lock);
632 while (!list_empty(&o2hb_node_events)
633 && !list_empty(&queued_event->hn_item)) {
634 event = list_entry(o2hb_node_events.next,
635 struct o2hb_node_event,
637 list_del_init(&event->hn_item);
638 spin_unlock(&o2hb_live_lock);
640 mlog(ML_HEARTBEAT, "Node %s event for %d\n",
641 event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN",
644 hbcall = hbcall_from_type(event->hn_event_type);
646 /* We should *never* have gotten on to the list with a
647 * bad type... This isn't something that we should try
648 * to recover from. */
649 BUG_ON(IS_ERR(hbcall));
651 o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num);
653 spin_lock(&o2hb_live_lock);
655 spin_unlock(&o2hb_live_lock);
657 up_write(&o2hb_callback_sem);
660 static void o2hb_queue_node_event(struct o2hb_node_event *event,
661 enum o2hb_callback_type type,
662 struct o2nm_node *node,
665 assert_spin_locked(&o2hb_live_lock);
667 BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB));
669 event->hn_event_type = type;
670 event->hn_node = node;
671 event->hn_node_num = node_num;
673 mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n",
674 type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num);
676 list_add_tail(&event->hn_item, &o2hb_node_events);
679 static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot)
681 struct o2hb_node_event event =
682 { .hn_item = LIST_HEAD_INIT(event.hn_item), };
683 struct o2nm_node *node;
685 node = o2nm_get_node_by_num(slot->ds_node_num);
689 spin_lock(&o2hb_live_lock);
690 if (!list_empty(&slot->ds_live_item)) {
691 mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n",
694 list_del_init(&slot->ds_live_item);
696 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
697 clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
699 o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node,
703 spin_unlock(&o2hb_live_lock);
705 o2hb_run_event_list(&event);
710 static void o2hb_set_quorum_device(struct o2hb_region *reg,
711 struct o2hb_disk_slot *slot)
713 assert_spin_locked(&o2hb_live_lock);
715 if (!o2hb_global_heartbeat_active())
718 if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
722 * A region can be added to the quorum only when it sees all
723 * live nodes heartbeat on it. In other words, the region has been
724 * added to all nodes.
726 if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap,
727 sizeof(o2hb_live_node_bitmap)))
730 if (slot->ds_changed_samples < O2HB_LIVE_THRESHOLD)
733 printk(KERN_NOTICE "o2hb: Region %s is now a quorum device\n",
734 config_item_name(®->hr_item));
736 set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
739 * If global heartbeat active, unpin all regions if the
740 * region count > CUT_OFF
742 if (o2hb_pop_count(&o2hb_quorum_region_bitmap,
743 O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF)
744 o2hb_region_unpin(NULL);
747 static int o2hb_check_slot(struct o2hb_region *reg,
748 struct o2hb_disk_slot *slot)
750 int changed = 0, gen_changed = 0;
751 struct o2hb_node_event event =
752 { .hn_item = LIST_HEAD_INIT(event.hn_item), };
753 struct o2nm_node *node;
754 struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block;
756 unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS;
757 unsigned int slot_dead_ms;
760 memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes);
763 * If a node is no longer configured but is still in the livemap, we
764 * may need to clear that bit from the livemap.
766 node = o2nm_get_node_by_num(slot->ds_node_num);
768 spin_lock(&o2hb_live_lock);
769 tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap);
770 spin_unlock(&o2hb_live_lock);
775 if (!o2hb_verify_crc(reg, hb_block)) {
776 /* all paths from here will drop o2hb_live_lock for
778 spin_lock(&o2hb_live_lock);
780 /* Don't print an error on the console in this case -
781 * a freshly formatted heartbeat area will not have a
783 if (list_empty(&slot->ds_live_item))
786 /* The node is live but pushed out a bad crc. We
787 * consider it a transient miss but don't populate any
788 * other values as they may be junk. */
789 mlog(ML_ERROR, "Node %d has written a bad crc to %s\n",
790 slot->ds_node_num, reg->hr_dev_name);
791 o2hb_dump_slot(hb_block);
793 slot->ds_equal_samples++;
797 /* we don't care if these wrap.. the state transitions below
798 * clear at the right places */
799 cputime = le64_to_cpu(hb_block->hb_seq);
800 if (slot->ds_last_time != cputime)
801 slot->ds_changed_samples++;
803 slot->ds_equal_samples++;
804 slot->ds_last_time = cputime;
806 /* The node changed heartbeat generations. We assume this to
807 * mean it dropped off but came back before we timed out. We
808 * want to consider it down for the time being but don't want
809 * to lose any changed_samples state we might build up to
810 * considering it live again. */
811 if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) {
813 slot->ds_equal_samples = 0;
814 mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx "
815 "to 0x%llx)\n", slot->ds_node_num,
816 (long long)slot->ds_last_generation,
817 (long long)le64_to_cpu(hb_block->hb_generation));
820 slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
822 mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x "
823 "seq %llu last %llu changed %u equal %u\n",
824 slot->ds_node_num, (long long)slot->ds_last_generation,
825 le32_to_cpu(hb_block->hb_cksum),
826 (unsigned long long)le64_to_cpu(hb_block->hb_seq),
827 (unsigned long long)slot->ds_last_time, slot->ds_changed_samples,
828 slot->ds_equal_samples);
830 spin_lock(&o2hb_live_lock);
833 /* dead nodes only come to life after some number of
834 * changes at any time during their dead time */
835 if (list_empty(&slot->ds_live_item) &&
836 slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) {
837 mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n",
838 slot->ds_node_num, (long long)slot->ds_last_generation);
840 set_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
842 /* first on the list generates a callback */
843 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
844 mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes "
845 "bitmap\n", slot->ds_node_num);
846 set_bit(slot->ds_node_num, o2hb_live_node_bitmap);
848 o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node,
854 list_add_tail(&slot->ds_live_item,
855 &o2hb_live_slots[slot->ds_node_num]);
857 slot->ds_equal_samples = 0;
859 /* We want to be sure that all nodes agree on the
860 * number of milliseconds before a node will be
861 * considered dead. The self-fencing timeout is
862 * computed from this value, and a discrepancy might
863 * result in heartbeat calling a node dead when it
864 * hasn't self-fenced yet. */
865 slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms);
866 if (slot_dead_ms && slot_dead_ms != dead_ms) {
867 /* TODO: Perhaps we can fail the region here. */
868 mlog(ML_ERROR, "Node %d on device %s has a dead count "
869 "of %u ms, but our count is %u ms.\n"
870 "Please double check your configuration values "
871 "for 'O2CB_HEARTBEAT_THRESHOLD'\n",
872 slot->ds_node_num, reg->hr_dev_name, slot_dead_ms,
878 /* if the list is dead, we're done.. */
879 if (list_empty(&slot->ds_live_item))
882 /* live nodes only go dead after enough consequtive missed
883 * samples.. reset the missed counter whenever we see
885 if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) {
886 mlog(ML_HEARTBEAT, "Node %d left my region\n",
889 clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
891 /* last off the live_slot generates a callback */
892 list_del_init(&slot->ds_live_item);
893 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
894 mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live "
895 "nodes bitmap\n", slot->ds_node_num);
896 clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
898 /* node can be null */
899 o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB,
900 node, slot->ds_node_num);
905 /* We don't clear this because the node is still
906 * actually writing new blocks. */
908 slot->ds_changed_samples = 0;
911 if (slot->ds_changed_samples) {
912 slot->ds_changed_samples = 0;
913 slot->ds_equal_samples = 0;
916 o2hb_set_quorum_device(reg, slot);
918 spin_unlock(&o2hb_live_lock);
920 o2hb_run_event_list(&event);
927 /* This could be faster if we just implmented a find_last_bit, but I
928 * don't think the circumstances warrant it. */
929 static int o2hb_highest_node(unsigned long *nodes,
936 while ((node = find_next_bit(nodes, numbits, node + 1)) != -1) {
946 static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
948 int i, ret, highest_node, change = 0;
949 unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)];
950 unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
951 struct o2hb_bio_wait_ctxt write_wc;
953 ret = o2nm_configured_node_map(configured_nodes,
954 sizeof(configured_nodes));
961 * If a node is not configured but is in the livemap, we still need
962 * to read the slot so as to be able to remove it from the livemap.
964 o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap));
966 while ((i = find_next_bit(live_node_bitmap,
967 O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
968 set_bit(i, configured_nodes);
971 highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES);
972 if (highest_node >= O2NM_MAX_NODES) {
973 mlog(ML_NOTICE, "ocfs2_heartbeat: no configured nodes found!\n");
977 /* No sense in reading the slots of nodes that don't exist
978 * yet. Of course, if the node definitions have holes in them
979 * then we're reading an empty slot anyway... Consider this
981 ret = o2hb_read_slots(reg, highest_node + 1);
987 /* With an up to date view of the slots, we can check that no
988 * other node has been improperly configured to heartbeat in
990 if (!o2hb_check_last_timestamp(reg))
991 mlog(ML_ERROR, "Device \"%s\": another node is heartbeating "
992 "in our slot!\n", reg->hr_dev_name);
994 /* fill in the proper info for our next heartbeat */
995 o2hb_prepare_block(reg, reg->hr_generation);
997 /* And fire off the write. Note that we don't wait on this I/O
999 ret = o2hb_issue_node_write(reg, &write_wc);
1006 while((i = find_next_bit(configured_nodes, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
1008 change |= o2hb_check_slot(reg, ®->hr_slots[i]);
1012 * We have to be sure we've advertised ourselves on disk
1013 * before we can go to steady state. This ensures that
1014 * people we find in our steady state have seen us.
1016 o2hb_wait_on_io(reg, &write_wc);
1017 if (write_wc.wc_error) {
1018 /* Do not re-arm the write timeout on I/O error - we
1019 * can't be sure that the new block ever made it to
1021 mlog(ML_ERROR, "Write error %d on device \"%s\"\n",
1022 write_wc.wc_error, reg->hr_dev_name);
1023 return write_wc.wc_error;
1026 o2hb_arm_write_timeout(reg);
1028 /* let the person who launched us know when things are steady */
1029 if (!change && (atomic_read(®->hr_steady_iterations) != 0)) {
1030 if (atomic_dec_and_test(®->hr_steady_iterations))
1031 wake_up(&o2hb_steady_queue);
1037 /* Subtract b from a, storing the result in a. a *must* have a larger
1039 static void o2hb_tv_subtract(struct timeval *a,
1042 /* just return 0 when a is after b */
1043 if (a->tv_sec < b->tv_sec ||
1044 (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec)) {
1050 a->tv_sec -= b->tv_sec;
1051 a->tv_usec -= b->tv_usec;
1052 while ( a->tv_usec < 0 ) {
1054 a->tv_usec += 1000000;
1058 static unsigned int o2hb_elapsed_msecs(struct timeval *start,
1059 struct timeval *end)
1061 struct timeval res = *end;
1063 o2hb_tv_subtract(&res, start);
1065 return res.tv_sec * 1000 + res.tv_usec / 1000;
1069 * we ride the region ref that the region dir holds. before the region
1070 * dir is removed and drops it ref it will wait to tear down this
1073 static int o2hb_thread(void *data)
1076 struct o2hb_region *reg = data;
1077 struct o2hb_bio_wait_ctxt write_wc;
1078 struct timeval before_hb, after_hb;
1079 unsigned int elapsed_msec;
1081 mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n");
1083 set_user_nice(current, -20);
1086 o2nm_depend_this_node();
1088 while (!kthread_should_stop() && !reg->hr_unclean_stop) {
1089 /* We track the time spent inside
1090 * o2hb_do_disk_heartbeat so that we avoid more than
1091 * hr_timeout_ms between disk writes. On busy systems
1092 * this should result in a heartbeat which is less
1093 * likely to time itself out. */
1094 do_gettimeofday(&before_hb);
1098 ret = o2hb_do_disk_heartbeat(reg);
1099 } while (ret && ++i < 2);
1101 do_gettimeofday(&after_hb);
1102 elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb);
1105 "start = %lu.%lu, end = %lu.%lu, msec = %u\n",
1106 before_hb.tv_sec, (unsigned long) before_hb.tv_usec,
1107 after_hb.tv_sec, (unsigned long) after_hb.tv_usec,
1110 if (elapsed_msec < reg->hr_timeout_ms) {
1111 /* the kthread api has blocked signals for us so no
1112 * need to record the return value. */
1113 msleep_interruptible(reg->hr_timeout_ms - elapsed_msec);
1117 o2hb_disarm_write_timeout(reg);
1119 /* unclean stop is only used in very bad situation */
1120 for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++)
1121 o2hb_shutdown_slot(®->hr_slots[i]);
1123 /* Explicit down notification - avoid forcing the other nodes
1124 * to timeout on this region when we could just as easily
1125 * write a clear generation - thus indicating to them that
1126 * this node has left this region.
1128 * XXX: Should we skip this on unclean_stop? */
1129 o2hb_prepare_block(reg, 0);
1130 ret = o2hb_issue_node_write(reg, &write_wc);
1132 o2hb_wait_on_io(reg, &write_wc);
1138 o2nm_undepend_this_node();
1140 mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread exiting\n");
1145 #ifdef CONFIG_DEBUG_FS
1146 static int o2hb_debug_open(struct inode *inode, struct file *file)
1148 struct o2hb_debug_buf *db = inode->i_private;
1149 struct o2hb_region *reg;
1150 unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1155 /* max_nodes should be the largest bitmap we pass here */
1156 BUG_ON(sizeof(map) < db->db_size);
1158 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1162 switch (db->db_type) {
1163 case O2HB_DB_TYPE_LIVENODES:
1164 case O2HB_DB_TYPE_LIVEREGIONS:
1165 case O2HB_DB_TYPE_QUORUMREGIONS:
1166 case O2HB_DB_TYPE_FAILEDREGIONS:
1167 spin_lock(&o2hb_live_lock);
1168 memcpy(map, db->db_data, db->db_size);
1169 spin_unlock(&o2hb_live_lock);
1172 case O2HB_DB_TYPE_REGION_LIVENODES:
1173 spin_lock(&o2hb_live_lock);
1174 reg = (struct o2hb_region *)db->db_data;
1175 memcpy(map, reg->hr_live_node_bitmap, db->db_size);
1176 spin_unlock(&o2hb_live_lock);
1179 case O2HB_DB_TYPE_REGION_NUMBER:
1180 reg = (struct o2hb_region *)db->db_data;
1181 out += snprintf(buf + out, PAGE_SIZE - out, "%d\n",
1182 reg->hr_region_num);
1185 case O2HB_DB_TYPE_REGION_ELAPSED_TIME:
1186 reg = (struct o2hb_region *)db->db_data;
1187 out += snprintf(buf + out, PAGE_SIZE - out, "%u\n",
1188 jiffies_to_msecs(jiffies -
1189 reg->hr_last_timeout_start));
1192 case O2HB_DB_TYPE_REGION_PINNED:
1193 reg = (struct o2hb_region *)db->db_data;
1194 out += snprintf(buf + out, PAGE_SIZE - out, "%u\n",
1195 !!reg->hr_item_pinned);
1202 while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len)
1203 out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
1204 out += snprintf(buf + out, PAGE_SIZE - out, "\n");
1207 i_size_write(inode, out);
1209 file->private_data = buf;
1216 static int o2hb_debug_release(struct inode *inode, struct file *file)
1218 kfree(file->private_data);
1222 static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
1223 size_t nbytes, loff_t *ppos)
1225 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
1226 i_size_read(file->f_mapping->host));
1229 static int o2hb_debug_open(struct inode *inode, struct file *file)
1233 static int o2hb_debug_release(struct inode *inode, struct file *file)
1237 static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
1238 size_t nbytes, loff_t *ppos)
1242 #endif /* CONFIG_DEBUG_FS */
1244 static const struct file_operations o2hb_debug_fops = {
1245 .open = o2hb_debug_open,
1246 .release = o2hb_debug_release,
1247 .read = o2hb_debug_read,
1248 .llseek = generic_file_llseek,
1251 void o2hb_exit(void)
1253 kfree(o2hb_db_livenodes);
1254 kfree(o2hb_db_liveregions);
1255 kfree(o2hb_db_quorumregions);
1256 kfree(o2hb_db_failedregions);
1257 debugfs_remove(o2hb_debug_failedregions);
1258 debugfs_remove(o2hb_debug_quorumregions);
1259 debugfs_remove(o2hb_debug_liveregions);
1260 debugfs_remove(o2hb_debug_livenodes);
1261 debugfs_remove(o2hb_debug_dir);
1264 static struct dentry *o2hb_debug_create(const char *name, struct dentry *dir,
1265 struct o2hb_debug_buf **db, int db_len,
1266 int type, int size, int len, void *data)
1268 *db = kmalloc(db_len, GFP_KERNEL);
1272 (*db)->db_type = type;
1273 (*db)->db_size = size;
1274 (*db)->db_len = len;
1275 (*db)->db_data = data;
1277 return debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db,
1281 static int o2hb_debug_init(void)
1285 o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
1286 if (!o2hb_debug_dir) {
1291 o2hb_debug_livenodes = o2hb_debug_create(O2HB_DEBUG_LIVENODES,
1294 sizeof(*o2hb_db_livenodes),
1295 O2HB_DB_TYPE_LIVENODES,
1296 sizeof(o2hb_live_node_bitmap),
1298 o2hb_live_node_bitmap);
1299 if (!o2hb_debug_livenodes) {
1304 o2hb_debug_liveregions = o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS,
1306 &o2hb_db_liveregions,
1307 sizeof(*o2hb_db_liveregions),
1308 O2HB_DB_TYPE_LIVEREGIONS,
1309 sizeof(o2hb_live_region_bitmap),
1311 o2hb_live_region_bitmap);
1312 if (!o2hb_debug_liveregions) {
1317 o2hb_debug_quorumregions =
1318 o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS,
1320 &o2hb_db_quorumregions,
1321 sizeof(*o2hb_db_quorumregions),
1322 O2HB_DB_TYPE_QUORUMREGIONS,
1323 sizeof(o2hb_quorum_region_bitmap),
1325 o2hb_quorum_region_bitmap);
1326 if (!o2hb_debug_quorumregions) {
1331 o2hb_debug_failedregions =
1332 o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS,
1334 &o2hb_db_failedregions,
1335 sizeof(*o2hb_db_failedregions),
1336 O2HB_DB_TYPE_FAILEDREGIONS,
1337 sizeof(o2hb_failed_region_bitmap),
1339 o2hb_failed_region_bitmap);
1340 if (!o2hb_debug_failedregions) {
1357 for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++)
1358 INIT_LIST_HEAD(&o2hb_callbacks[i].list);
1360 for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++)
1361 INIT_LIST_HEAD(&o2hb_live_slots[i]);
1363 INIT_LIST_HEAD(&o2hb_node_events);
1365 memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
1366 memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap));
1367 memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap));
1368 memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap));
1369 memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap));
1371 o2hb_dependent_users = 0;
1373 return o2hb_debug_init();
1376 /* if we're already in a callback then we're already serialized by the sem */
1377 static void o2hb_fill_node_map_from_callback(unsigned long *map,
1380 BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
1382 memcpy(map, &o2hb_live_node_bitmap, bytes);
1386 * get a map of all nodes that are heartbeating in any regions
1388 void o2hb_fill_node_map(unsigned long *map, unsigned bytes)
1390 /* callers want to serialize this map and callbacks so that they
1391 * can trust that they don't miss nodes coming to the party */
1392 down_read(&o2hb_callback_sem);
1393 spin_lock(&o2hb_live_lock);
1394 o2hb_fill_node_map_from_callback(map, bytes);
1395 spin_unlock(&o2hb_live_lock);
1396 up_read(&o2hb_callback_sem);
1398 EXPORT_SYMBOL_GPL(o2hb_fill_node_map);
1401 * heartbeat configfs bits. The heartbeat set is a default set under
1402 * the cluster set in nodemanager.c.
1405 static struct o2hb_region *to_o2hb_region(struct config_item *item)
1407 return item ? container_of(item, struct o2hb_region, hr_item) : NULL;
1410 /* drop_item only drops its ref after killing the thread, nothing should
1411 * be using the region anymore. this has to clean up any state that
1412 * attributes might have built up. */
1413 static void o2hb_region_release(struct config_item *item)
1417 struct o2hb_region *reg = to_o2hb_region(item);
1419 if (reg->hr_tmp_block)
1420 kfree(reg->hr_tmp_block);
1422 if (reg->hr_slot_data) {
1423 for (i = 0; i < reg->hr_num_pages; i++) {
1424 page = reg->hr_slot_data[i];
1428 kfree(reg->hr_slot_data);
1432 blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
1435 kfree(reg->hr_slots);
1437 kfree(reg->hr_db_regnum);
1438 kfree(reg->hr_db_livenodes);
1439 debugfs_remove(reg->hr_debug_livenodes);
1440 debugfs_remove(reg->hr_debug_regnum);
1441 debugfs_remove(reg->hr_debug_elapsed_time);
1442 debugfs_remove(reg->hr_debug_pinned);
1443 debugfs_remove(reg->hr_debug_dir);
1445 spin_lock(&o2hb_live_lock);
1446 list_del(®->hr_all_item);
1447 spin_unlock(&o2hb_live_lock);
1452 static int o2hb_read_block_input(struct o2hb_region *reg,
1455 unsigned long *ret_bytes,
1456 unsigned int *ret_bits)
1458 unsigned long bytes;
1459 char *p = (char *)page;
1461 bytes = simple_strtoul(p, &p, 0);
1462 if (!p || (*p && (*p != '\n')))
1465 /* Heartbeat and fs min / max block sizes are the same. */
1466 if (bytes > 4096 || bytes < 512)
1468 if (hweight16(bytes) != 1)
1474 *ret_bits = ffs(bytes) - 1;
1479 static ssize_t o2hb_region_block_bytes_read(struct o2hb_region *reg,
1482 return sprintf(page, "%u\n", reg->hr_block_bytes);
1485 static ssize_t o2hb_region_block_bytes_write(struct o2hb_region *reg,
1490 unsigned long block_bytes;
1491 unsigned int block_bits;
1496 status = o2hb_read_block_input(reg, page, count,
1497 &block_bytes, &block_bits);
1501 reg->hr_block_bytes = (unsigned int)block_bytes;
1502 reg->hr_block_bits = block_bits;
1507 static ssize_t o2hb_region_start_block_read(struct o2hb_region *reg,
1510 return sprintf(page, "%llu\n", reg->hr_start_block);
1513 static ssize_t o2hb_region_start_block_write(struct o2hb_region *reg,
1517 unsigned long long tmp;
1518 char *p = (char *)page;
1523 tmp = simple_strtoull(p, &p, 0);
1524 if (!p || (*p && (*p != '\n')))
1527 reg->hr_start_block = tmp;
1532 static ssize_t o2hb_region_blocks_read(struct o2hb_region *reg,
1535 return sprintf(page, "%d\n", reg->hr_blocks);
1538 static ssize_t o2hb_region_blocks_write(struct o2hb_region *reg,
1543 char *p = (char *)page;
1548 tmp = simple_strtoul(p, &p, 0);
1549 if (!p || (*p && (*p != '\n')))
1552 if (tmp > O2NM_MAX_NODES || tmp == 0)
1555 reg->hr_blocks = (unsigned int)tmp;
1560 static ssize_t o2hb_region_dev_read(struct o2hb_region *reg,
1563 unsigned int ret = 0;
1566 ret = sprintf(page, "%s\n", reg->hr_dev_name);
1571 static void o2hb_init_region_params(struct o2hb_region *reg)
1573 reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits;
1574 reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS;
1576 mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n",
1577 reg->hr_start_block, reg->hr_blocks);
1578 mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n",
1579 reg->hr_block_bytes, reg->hr_block_bits);
1580 mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms);
1581 mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold);
1584 static int o2hb_map_slot_data(struct o2hb_region *reg)
1587 unsigned int last_slot;
1588 unsigned int spp = reg->hr_slots_per_page;
1591 struct o2hb_disk_slot *slot;
1593 reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL);
1594 if (reg->hr_tmp_block == NULL) {
1595 mlog_errno(-ENOMEM);
1599 reg->hr_slots = kcalloc(reg->hr_blocks,
1600 sizeof(struct o2hb_disk_slot), GFP_KERNEL);
1601 if (reg->hr_slots == NULL) {
1602 mlog_errno(-ENOMEM);
1606 for(i = 0; i < reg->hr_blocks; i++) {
1607 slot = ®->hr_slots[i];
1608 slot->ds_node_num = i;
1609 INIT_LIST_HEAD(&slot->ds_live_item);
1610 slot->ds_raw_block = NULL;
1613 reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp;
1614 mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks "
1615 "at %u blocks per page\n",
1616 reg->hr_num_pages, reg->hr_blocks, spp);
1618 reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *),
1620 if (!reg->hr_slot_data) {
1621 mlog_errno(-ENOMEM);
1625 for(i = 0; i < reg->hr_num_pages; i++) {
1626 page = alloc_page(GFP_KERNEL);
1628 mlog_errno(-ENOMEM);
1632 reg->hr_slot_data[i] = page;
1634 last_slot = i * spp;
1635 raw = page_address(page);
1637 (j < spp) && ((j + last_slot) < reg->hr_blocks);
1639 BUG_ON((j + last_slot) >= reg->hr_blocks);
1641 slot = ®->hr_slots[j + last_slot];
1642 slot->ds_raw_block =
1643 (struct o2hb_disk_heartbeat_block *) raw;
1645 raw += reg->hr_block_bytes;
1652 /* Read in all the slots available and populate the tracking
1653 * structures so that we can start with a baseline idea of what's
1655 static int o2hb_populate_slot_data(struct o2hb_region *reg)
1658 struct o2hb_disk_slot *slot;
1659 struct o2hb_disk_heartbeat_block *hb_block;
1661 ret = o2hb_read_slots(reg, reg->hr_blocks);
1667 /* We only want to get an idea of the values initially in each
1668 * slot, so we do no verification - o2hb_check_slot will
1669 * actually determine if each configured slot is valid and
1670 * whether any values have changed. */
1671 for(i = 0; i < reg->hr_blocks; i++) {
1672 slot = ®->hr_slots[i];
1673 hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block;
1675 /* Only fill the values that o2hb_check_slot uses to
1676 * determine changing slots */
1677 slot->ds_last_time = le64_to_cpu(hb_block->hb_seq);
1678 slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
1685 /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */
1686 static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
1690 struct task_struct *hb_task;
1693 char *p = (char *)page;
1694 struct file *filp = NULL;
1695 struct inode *inode = NULL;
1696 ssize_t ret = -EINVAL;
1701 /* We can't heartbeat without having had our node number
1702 * configured yet. */
1703 if (o2nm_this_node() == O2NM_MAX_NODES)
1706 fd = simple_strtol(p, &p, 0);
1707 if (!p || (*p && (*p != '\n')))
1710 if (fd < 0 || fd >= INT_MAX)
1717 if (reg->hr_blocks == 0 || reg->hr_start_block == 0 ||
1718 reg->hr_block_bytes == 0)
1721 inode = igrab(filp->f_mapping->host);
1725 if (!S_ISBLK(inode->i_mode))
1728 reg->hr_bdev = I_BDEV(filp->f_mapping->host);
1729 ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, NULL);
1731 reg->hr_bdev = NULL;
1736 bdevname(reg->hr_bdev, reg->hr_dev_name);
1738 sectsize = bdev_logical_block_size(reg->hr_bdev);
1739 if (sectsize != reg->hr_block_bytes) {
1741 "blocksize %u incorrect for device, expected %d",
1742 reg->hr_block_bytes, sectsize);
1747 o2hb_init_region_params(reg);
1749 /* Generation of zero is invalid */
1751 get_random_bytes(®->hr_generation,
1752 sizeof(reg->hr_generation));
1753 } while (reg->hr_generation == 0);
1755 ret = o2hb_map_slot_data(reg);
1761 ret = o2hb_populate_slot_data(reg);
1767 INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout);
1770 * A node is considered live after it has beat LIVE_THRESHOLD
1771 * times. We're not steady until we've given them a chance
1772 * _after_ our first read.
1774 atomic_set(®->hr_steady_iterations, O2HB_LIVE_THRESHOLD + 1);
1776 hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s",
1777 reg->hr_item.ci_name);
1778 if (IS_ERR(hb_task)) {
1779 ret = PTR_ERR(hb_task);
1784 spin_lock(&o2hb_live_lock);
1785 reg->hr_task = hb_task;
1786 spin_unlock(&o2hb_live_lock);
1788 ret = wait_event_interruptible(o2hb_steady_queue,
1789 atomic_read(®->hr_steady_iterations) == 0);
1791 /* We got interrupted (hello ptrace!). Clean up */
1792 spin_lock(&o2hb_live_lock);
1793 hb_task = reg->hr_task;
1794 reg->hr_task = NULL;
1795 spin_unlock(&o2hb_live_lock);
1798 kthread_stop(hb_task);
1802 /* Ok, we were woken. Make sure it wasn't by drop_item() */
1803 spin_lock(&o2hb_live_lock);
1804 hb_task = reg->hr_task;
1805 if (o2hb_global_heartbeat_active())
1806 set_bit(reg->hr_region_num, o2hb_live_region_bitmap);
1807 spin_unlock(&o2hb_live_lock);
1814 if (hb_task && o2hb_global_heartbeat_active())
1815 printk(KERN_NOTICE "o2hb: Heartbeat started on region %s\n",
1816 config_item_name(®->hr_item));
1825 blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
1826 reg->hr_bdev = NULL;
1832 static ssize_t o2hb_region_pid_read(struct o2hb_region *reg,
1837 spin_lock(&o2hb_live_lock);
1839 pid = task_pid_nr(reg->hr_task);
1840 spin_unlock(&o2hb_live_lock);
1845 return sprintf(page, "%u\n", pid);
1848 struct o2hb_region_attribute {
1849 struct configfs_attribute attr;
1850 ssize_t (*show)(struct o2hb_region *, char *);
1851 ssize_t (*store)(struct o2hb_region *, const char *, size_t);
1854 static struct o2hb_region_attribute o2hb_region_attr_block_bytes = {
1855 .attr = { .ca_owner = THIS_MODULE,
1856 .ca_name = "block_bytes",
1857 .ca_mode = S_IRUGO | S_IWUSR },
1858 .show = o2hb_region_block_bytes_read,
1859 .store = o2hb_region_block_bytes_write,
1862 static struct o2hb_region_attribute o2hb_region_attr_start_block = {
1863 .attr = { .ca_owner = THIS_MODULE,
1864 .ca_name = "start_block",
1865 .ca_mode = S_IRUGO | S_IWUSR },
1866 .show = o2hb_region_start_block_read,
1867 .store = o2hb_region_start_block_write,
1870 static struct o2hb_region_attribute o2hb_region_attr_blocks = {
1871 .attr = { .ca_owner = THIS_MODULE,
1872 .ca_name = "blocks",
1873 .ca_mode = S_IRUGO | S_IWUSR },
1874 .show = o2hb_region_blocks_read,
1875 .store = o2hb_region_blocks_write,
1878 static struct o2hb_region_attribute o2hb_region_attr_dev = {
1879 .attr = { .ca_owner = THIS_MODULE,
1881 .ca_mode = S_IRUGO | S_IWUSR },
1882 .show = o2hb_region_dev_read,
1883 .store = o2hb_region_dev_write,
1886 static struct o2hb_region_attribute o2hb_region_attr_pid = {
1887 .attr = { .ca_owner = THIS_MODULE,
1889 .ca_mode = S_IRUGO | S_IRUSR },
1890 .show = o2hb_region_pid_read,
1893 static struct configfs_attribute *o2hb_region_attrs[] = {
1894 &o2hb_region_attr_block_bytes.attr,
1895 &o2hb_region_attr_start_block.attr,
1896 &o2hb_region_attr_blocks.attr,
1897 &o2hb_region_attr_dev.attr,
1898 &o2hb_region_attr_pid.attr,
1902 static ssize_t o2hb_region_show(struct config_item *item,
1903 struct configfs_attribute *attr,
1906 struct o2hb_region *reg = to_o2hb_region(item);
1907 struct o2hb_region_attribute *o2hb_region_attr =
1908 container_of(attr, struct o2hb_region_attribute, attr);
1911 if (o2hb_region_attr->show)
1912 ret = o2hb_region_attr->show(reg, page);
1916 static ssize_t o2hb_region_store(struct config_item *item,
1917 struct configfs_attribute *attr,
1918 const char *page, size_t count)
1920 struct o2hb_region *reg = to_o2hb_region(item);
1921 struct o2hb_region_attribute *o2hb_region_attr =
1922 container_of(attr, struct o2hb_region_attribute, attr);
1923 ssize_t ret = -EINVAL;
1925 if (o2hb_region_attr->store)
1926 ret = o2hb_region_attr->store(reg, page, count);
1930 static struct configfs_item_operations o2hb_region_item_ops = {
1931 .release = o2hb_region_release,
1932 .show_attribute = o2hb_region_show,
1933 .store_attribute = o2hb_region_store,
1936 static struct config_item_type o2hb_region_type = {
1937 .ct_item_ops = &o2hb_region_item_ops,
1938 .ct_attrs = o2hb_region_attrs,
1939 .ct_owner = THIS_MODULE,
1944 struct o2hb_heartbeat_group {
1945 struct config_group hs_group;
1949 static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group)
1952 container_of(group, struct o2hb_heartbeat_group, hs_group)
1956 static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
1961 debugfs_create_dir(config_item_name(®->hr_item), dir);
1962 if (!reg->hr_debug_dir) {
1967 reg->hr_debug_livenodes =
1968 o2hb_debug_create(O2HB_DEBUG_LIVENODES,
1970 &(reg->hr_db_livenodes),
1971 sizeof(*(reg->hr_db_livenodes)),
1972 O2HB_DB_TYPE_REGION_LIVENODES,
1973 sizeof(reg->hr_live_node_bitmap),
1974 O2NM_MAX_NODES, reg);
1975 if (!reg->hr_debug_livenodes) {
1980 reg->hr_debug_regnum =
1981 o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER,
1983 &(reg->hr_db_regnum),
1984 sizeof(*(reg->hr_db_regnum)),
1985 O2HB_DB_TYPE_REGION_NUMBER,
1986 0, O2NM_MAX_NODES, reg);
1987 if (!reg->hr_debug_regnum) {
1992 reg->hr_debug_elapsed_time =
1993 o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME,
1995 &(reg->hr_db_elapsed_time),
1996 sizeof(*(reg->hr_db_elapsed_time)),
1997 O2HB_DB_TYPE_REGION_ELAPSED_TIME,
1999 if (!reg->hr_debug_elapsed_time) {
2004 reg->hr_debug_pinned =
2005 o2hb_debug_create(O2HB_DEBUG_REGION_PINNED,
2007 &(reg->hr_db_pinned),
2008 sizeof(*(reg->hr_db_pinned)),
2009 O2HB_DB_TYPE_REGION_PINNED,
2011 if (!reg->hr_debug_pinned) {
2021 static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group,
2024 struct o2hb_region *reg = NULL;
2027 reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL);
2029 return ERR_PTR(-ENOMEM);
2031 if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) {
2032 ret = -ENAMETOOLONG;
2036 spin_lock(&o2hb_live_lock);
2037 reg->hr_region_num = 0;
2038 if (o2hb_global_heartbeat_active()) {
2039 reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap,
2041 if (reg->hr_region_num >= O2NM_MAX_REGIONS) {
2042 spin_unlock(&o2hb_live_lock);
2046 set_bit(reg->hr_region_num, o2hb_region_bitmap);
2048 list_add_tail(®->hr_all_item, &o2hb_all_regions);
2049 spin_unlock(&o2hb_live_lock);
2051 config_item_init_type_name(®->hr_item, name, &o2hb_region_type);
2053 ret = o2hb_debug_region_init(reg, o2hb_debug_dir);
2055 config_item_put(®->hr_item);
2059 return ®->hr_item;
2062 return ERR_PTR(ret);
2065 static void o2hb_heartbeat_group_drop_item(struct config_group *group,
2066 struct config_item *item)
2068 struct task_struct *hb_task;
2069 struct o2hb_region *reg = to_o2hb_region(item);
2070 int quorum_region = 0;
2072 /* stop the thread when the user removes the region dir */
2073 spin_lock(&o2hb_live_lock);
2074 if (o2hb_global_heartbeat_active()) {
2075 clear_bit(reg->hr_region_num, o2hb_region_bitmap);
2076 clear_bit(reg->hr_region_num, o2hb_live_region_bitmap);
2077 if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
2079 clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
2081 hb_task = reg->hr_task;
2082 reg->hr_task = NULL;
2083 reg->hr_item_dropped = 1;
2084 spin_unlock(&o2hb_live_lock);
2087 kthread_stop(hb_task);
2090 * If we're racing a dev_write(), we need to wake them. They will
2091 * check reg->hr_task
2093 if (atomic_read(®->hr_steady_iterations) != 0) {
2094 atomic_set(®->hr_steady_iterations, 0);
2095 wake_up(&o2hb_steady_queue);
2098 if (o2hb_global_heartbeat_active())
2099 printk(KERN_NOTICE "o2hb: Heartbeat stopped on region %s\n",
2100 config_item_name(®->hr_item));
2102 config_item_put(item);
2104 if (!o2hb_global_heartbeat_active() || !quorum_region)
2108 * If global heartbeat active and there are dependent users,
2109 * pin all regions if quorum region count <= CUT_OFF
2111 spin_lock(&o2hb_live_lock);
2113 if (!o2hb_dependent_users)
2116 if (o2hb_pop_count(&o2hb_quorum_region_bitmap,
2117 O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
2118 o2hb_region_pin(NULL);
2121 spin_unlock(&o2hb_live_lock);
2124 struct o2hb_heartbeat_group_attribute {
2125 struct configfs_attribute attr;
2126 ssize_t (*show)(struct o2hb_heartbeat_group *, char *);
2127 ssize_t (*store)(struct o2hb_heartbeat_group *, const char *, size_t);
2130 static ssize_t o2hb_heartbeat_group_show(struct config_item *item,
2131 struct configfs_attribute *attr,
2134 struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item));
2135 struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr =
2136 container_of(attr, struct o2hb_heartbeat_group_attribute, attr);
2139 if (o2hb_heartbeat_group_attr->show)
2140 ret = o2hb_heartbeat_group_attr->show(reg, page);
2144 static ssize_t o2hb_heartbeat_group_store(struct config_item *item,
2145 struct configfs_attribute *attr,
2146 const char *page, size_t count)
2148 struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item));
2149 struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr =
2150 container_of(attr, struct o2hb_heartbeat_group_attribute, attr);
2151 ssize_t ret = -EINVAL;
2153 if (o2hb_heartbeat_group_attr->store)
2154 ret = o2hb_heartbeat_group_attr->store(reg, page, count);
2158 static ssize_t o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group *group,
2161 return sprintf(page, "%u\n", o2hb_dead_threshold);
2164 static ssize_t o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group *group,
2169 char *p = (char *)page;
2171 tmp = simple_strtoul(p, &p, 10);
2172 if (!p || (*p && (*p != '\n')))
2175 /* this will validate ranges for us. */
2176 o2hb_dead_threshold_set((unsigned int) tmp);
2182 ssize_t o2hb_heartbeat_group_mode_show(struct o2hb_heartbeat_group *group,
2185 return sprintf(page, "%s\n",
2186 o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]);
2190 ssize_t o2hb_heartbeat_group_mode_store(struct o2hb_heartbeat_group *group,
2191 const char *page, size_t count)
2197 len = (page[count - 1] == '\n') ? count - 1 : count;
2201 for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) {
2202 if (strnicmp(page, o2hb_heartbeat_mode_desc[i], len))
2205 ret = o2hb_global_hearbeat_mode_set(i);
2207 printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n",
2208 o2hb_heartbeat_mode_desc[i]);
2216 static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold = {
2217 .attr = { .ca_owner = THIS_MODULE,
2218 .ca_name = "dead_threshold",
2219 .ca_mode = S_IRUGO | S_IWUSR },
2220 .show = o2hb_heartbeat_group_threshold_show,
2221 .store = o2hb_heartbeat_group_threshold_store,
2224 static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_mode = {
2225 .attr = { .ca_owner = THIS_MODULE,
2227 .ca_mode = S_IRUGO | S_IWUSR },
2228 .show = o2hb_heartbeat_group_mode_show,
2229 .store = o2hb_heartbeat_group_mode_store,
2232 static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = {
2233 &o2hb_heartbeat_group_attr_threshold.attr,
2234 &o2hb_heartbeat_group_attr_mode.attr,
2238 static struct configfs_item_operations o2hb_hearbeat_group_item_ops = {
2239 .show_attribute = o2hb_heartbeat_group_show,
2240 .store_attribute = o2hb_heartbeat_group_store,
2243 static struct configfs_group_operations o2hb_heartbeat_group_group_ops = {
2244 .make_item = o2hb_heartbeat_group_make_item,
2245 .drop_item = o2hb_heartbeat_group_drop_item,
2248 static struct config_item_type o2hb_heartbeat_group_type = {
2249 .ct_group_ops = &o2hb_heartbeat_group_group_ops,
2250 .ct_item_ops = &o2hb_hearbeat_group_item_ops,
2251 .ct_attrs = o2hb_heartbeat_group_attrs,
2252 .ct_owner = THIS_MODULE,
2255 /* this is just here to avoid touching group in heartbeat.h which the
2256 * entire damn world #includes */
2257 struct config_group *o2hb_alloc_hb_set(void)
2259 struct o2hb_heartbeat_group *hs = NULL;
2260 struct config_group *ret = NULL;
2262 hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL);
2266 config_group_init_type_name(&hs->hs_group, "heartbeat",
2267 &o2hb_heartbeat_group_type);
2269 ret = &hs->hs_group;
2276 void o2hb_free_hb_set(struct config_group *group)
2278 struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group);
2282 /* hb callback registration and issueing */
2284 static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type)
2286 if (type == O2HB_NUM_CB)
2287 return ERR_PTR(-EINVAL);
2289 return &o2hb_callbacks[type];
2292 void o2hb_setup_callback(struct o2hb_callback_func *hc,
2293 enum o2hb_callback_type type,
2298 INIT_LIST_HEAD(&hc->hc_item);
2301 hc->hc_priority = priority;
2303 hc->hc_magic = O2HB_CB_MAGIC;
2305 EXPORT_SYMBOL_GPL(o2hb_setup_callback);
2308 * In local heartbeat mode, region_uuid passed matches the dlm domain name.
2309 * In global heartbeat mode, region_uuid passed is NULL.
2311 * In local, we only pin the matching region. In global we pin all the active
2314 static int o2hb_region_pin(const char *region_uuid)
2316 int ret = 0, found = 0;
2317 struct o2hb_region *reg;
2320 assert_spin_locked(&o2hb_live_lock);
2322 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2323 uuid = config_item_name(®->hr_item);
2325 /* local heartbeat */
2327 if (strcmp(region_uuid, uuid))
2332 if (reg->hr_item_pinned || reg->hr_item_dropped)
2335 /* Ignore ENOENT only for local hb (userdlm domain) */
2336 ret = o2nm_depend_item(®->hr_item);
2338 mlog(ML_CLUSTER, "Pin region %s\n", uuid);
2339 reg->hr_item_pinned = 1;
2341 if (ret == -ENOENT && found)
2344 mlog(ML_ERROR, "Pin region %s fails with %d\n",
2358 * In local heartbeat mode, region_uuid passed matches the dlm domain name.
2359 * In global heartbeat mode, region_uuid passed is NULL.
2361 * In local, we only unpin the matching region. In global we unpin all the
2364 static void o2hb_region_unpin(const char *region_uuid)
2366 struct o2hb_region *reg;
2370 assert_spin_locked(&o2hb_live_lock);
2372 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2373 uuid = config_item_name(®->hr_item);
2375 if (strcmp(region_uuid, uuid))
2380 if (reg->hr_item_pinned) {
2381 mlog(ML_CLUSTER, "Unpin region %s\n", uuid);
2382 o2nm_undepend_item(®->hr_item);
2383 reg->hr_item_pinned = 0;
2390 static int o2hb_region_inc_user(const char *region_uuid)
2394 spin_lock(&o2hb_live_lock);
2396 /* local heartbeat */
2397 if (!o2hb_global_heartbeat_active()) {
2398 ret = o2hb_region_pin(region_uuid);
2403 * if global heartbeat active and this is the first dependent user,
2404 * pin all regions if quorum region count <= CUT_OFF
2406 o2hb_dependent_users++;
2407 if (o2hb_dependent_users > 1)
2410 if (o2hb_pop_count(&o2hb_quorum_region_bitmap,
2411 O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
2412 ret = o2hb_region_pin(NULL);
2415 spin_unlock(&o2hb_live_lock);
2419 void o2hb_region_dec_user(const char *region_uuid)
2421 spin_lock(&o2hb_live_lock);
2423 /* local heartbeat */
2424 if (!o2hb_global_heartbeat_active()) {
2425 o2hb_region_unpin(region_uuid);
2430 * if global heartbeat active and there are no dependent users,
2431 * unpin all quorum regions
2433 o2hb_dependent_users--;
2434 if (!o2hb_dependent_users)
2435 o2hb_region_unpin(NULL);
2438 spin_unlock(&o2hb_live_lock);
2441 int o2hb_register_callback(const char *region_uuid,
2442 struct o2hb_callback_func *hc)
2444 struct o2hb_callback_func *tmp;
2445 struct list_head *iter;
2446 struct o2hb_callback *hbcall;
2449 BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
2450 BUG_ON(!list_empty(&hc->hc_item));
2452 hbcall = hbcall_from_type(hc->hc_type);
2453 if (IS_ERR(hbcall)) {
2454 ret = PTR_ERR(hbcall);
2459 ret = o2hb_region_inc_user(region_uuid);
2466 down_write(&o2hb_callback_sem);
2468 list_for_each(iter, &hbcall->list) {
2469 tmp = list_entry(iter, struct o2hb_callback_func, hc_item);
2470 if (hc->hc_priority < tmp->hc_priority) {
2471 list_add_tail(&hc->hc_item, iter);
2475 if (list_empty(&hc->hc_item))
2476 list_add_tail(&hc->hc_item, &hbcall->list);
2478 up_write(&o2hb_callback_sem);
2481 mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n",
2482 ret, __builtin_return_address(0), hc);
2485 EXPORT_SYMBOL_GPL(o2hb_register_callback);
2487 void o2hb_unregister_callback(const char *region_uuid,
2488 struct o2hb_callback_func *hc)
2490 BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
2492 mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n",
2493 __builtin_return_address(0), hc);
2495 /* XXX Can this happen _with_ a region reference? */
2496 if (list_empty(&hc->hc_item))
2500 o2hb_region_dec_user(region_uuid);
2502 down_write(&o2hb_callback_sem);
2504 list_del_init(&hc->hc_item);
2506 up_write(&o2hb_callback_sem);
2508 EXPORT_SYMBOL_GPL(o2hb_unregister_callback);
2510 int o2hb_check_node_heartbeating(u8 node_num)
2512 unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
2514 o2hb_fill_node_map(testing_map, sizeof(testing_map));
2515 if (!test_bit(node_num, testing_map)) {
2517 "node (%u) does not have heartbeating enabled.\n",
2524 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating);
2526 int o2hb_check_node_heartbeating_from_callback(u8 node_num)
2528 unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
2530 o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map));
2531 if (!test_bit(node_num, testing_map)) {
2533 "node (%u) does not have heartbeating enabled.\n",
2540 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback);
2542 /* Makes sure our local node is configured with a node number, and is
2544 int o2hb_check_local_node_heartbeating(void)
2548 /* if this node was set then we have networking */
2549 node_num = o2nm_this_node();
2550 if (node_num == O2NM_MAX_NODES) {
2551 mlog(ML_HEARTBEAT, "this node has not been configured.\n");
2555 return o2hb_check_node_heartbeating(node_num);
2557 EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating);
2560 * this is just a hack until we get the plumbing which flips file systems
2561 * read only and drops the hb ref instead of killing the node dead.
2563 void o2hb_stop_all_regions(void)
2565 struct o2hb_region *reg;
2567 mlog(ML_ERROR, "stopping heartbeat on all active regions.\n");
2569 spin_lock(&o2hb_live_lock);
2571 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item)
2572 reg->hr_unclean_stop = 1;
2574 spin_unlock(&o2hb_live_lock);
2576 EXPORT_SYMBOL_GPL(o2hb_stop_all_regions);
2578 int o2hb_get_all_regions(char *region_uuids, u8 max_regions)
2580 struct o2hb_region *reg;
2584 spin_lock(&o2hb_live_lock);
2587 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2588 mlog(0, "Region: %s\n", config_item_name(®->hr_item));
2589 if (numregs < max_regions) {
2590 memcpy(p, config_item_name(®->hr_item),
2591 O2HB_MAX_REGION_NAME_LEN);
2592 p += O2HB_MAX_REGION_NAME_LEN;
2597 spin_unlock(&o2hb_live_lock);
2601 EXPORT_SYMBOL_GPL(o2hb_get_all_regions);
2603 int o2hb_global_heartbeat_active(void)
2605 return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL);
2607 EXPORT_SYMBOL(o2hb_global_heartbeat_active);