1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2004, 2005 Oracle. All rights reserved.
6 #include <linux/kernel.h>
7 #include <linux/sched.h>
8 #include <linux/jiffies.h>
9 #include <linux/module.h>
11 #include <linux/bio.h>
12 #include <linux/blkdev.h>
13 #include <linux/delay.h>
14 #include <linux/file.h>
15 #include <linux/kthread.h>
16 #include <linux/configfs.h>
17 #include <linux/random.h>
18 #include <linux/crc32.h>
19 #include <linux/time.h>
20 #include <linux/debugfs.h>
21 #include <linux/slab.h>
22 #include <linux/bitmap.h>
23 #include <linux/ktime.h>
24 #include "heartbeat.h"
26 #include "nodemanager.h"
33 * The first heartbeat pass had one global thread that would serialize all hb
34 * callback calls. This global serializing sem should only be removed once
35 * we've made sure that all callees can deal with being called concurrently
36 * from multiple hb region threads.
38 static DECLARE_RWSEM(o2hb_callback_sem);
41 * multiple hb threads are watching multiple regions. A node is live
42 * whenever any of the threads sees activity from the node in its region.
44 static DEFINE_SPINLOCK(o2hb_live_lock);
45 static struct list_head o2hb_live_slots[O2NM_MAX_NODES];
46 static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
47 static LIST_HEAD(o2hb_node_events);
48 static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue);
51 * In global heartbeat, we maintain a series of region bitmaps.
52 * - o2hb_region_bitmap allows us to limit the region number to max region.
53 * - o2hb_live_region_bitmap tracks live regions (seen steady iterations).
54 * - o2hb_quorum_region_bitmap tracks live regions that have seen all nodes
56 * - o2hb_failed_region_bitmap tracks the regions that have seen io timeouts.
58 static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
59 static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
60 static unsigned long o2hb_quorum_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
61 static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)];
63 #define O2HB_DB_TYPE_LIVENODES 0
64 #define O2HB_DB_TYPE_LIVEREGIONS 1
65 #define O2HB_DB_TYPE_QUORUMREGIONS 2
66 #define O2HB_DB_TYPE_FAILEDREGIONS 3
67 #define O2HB_DB_TYPE_REGION_LIVENODES 4
68 #define O2HB_DB_TYPE_REGION_NUMBER 5
69 #define O2HB_DB_TYPE_REGION_ELAPSED_TIME 6
70 #define O2HB_DB_TYPE_REGION_PINNED 7
71 struct o2hb_debug_buf {
78 static struct o2hb_debug_buf *o2hb_db_livenodes;
79 static struct o2hb_debug_buf *o2hb_db_liveregions;
80 static struct o2hb_debug_buf *o2hb_db_quorumregions;
81 static struct o2hb_debug_buf *o2hb_db_failedregions;
83 #define O2HB_DEBUG_DIR "o2hb"
84 #define O2HB_DEBUG_LIVENODES "livenodes"
85 #define O2HB_DEBUG_LIVEREGIONS "live_regions"
86 #define O2HB_DEBUG_QUORUMREGIONS "quorum_regions"
87 #define O2HB_DEBUG_FAILEDREGIONS "failed_regions"
88 #define O2HB_DEBUG_REGION_NUMBER "num"
89 #define O2HB_DEBUG_REGION_ELAPSED_TIME "elapsed_time_in_ms"
90 #define O2HB_DEBUG_REGION_PINNED "pinned"
92 static struct dentry *o2hb_debug_dir;
94 static LIST_HEAD(o2hb_all_regions);
96 static struct o2hb_callback {
97 struct list_head list;
98 } o2hb_callbacks[O2HB_NUM_CB];
100 static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type);
102 enum o2hb_heartbeat_modes {
103 O2HB_HEARTBEAT_LOCAL = 0,
104 O2HB_HEARTBEAT_GLOBAL,
105 O2HB_HEARTBEAT_NUM_MODES,
108 static const char *o2hb_heartbeat_mode_desc[O2HB_HEARTBEAT_NUM_MODES] = {
109 "local", /* O2HB_HEARTBEAT_LOCAL */
110 "global", /* O2HB_HEARTBEAT_GLOBAL */
113 unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD;
114 static unsigned int o2hb_heartbeat_mode = O2HB_HEARTBEAT_LOCAL;
117 * o2hb_dependent_users tracks the number of registered callbacks that depend
118 * on heartbeat. o2net and o2dlm are two entities that register this callback.
119 * However only o2dlm depends on the heartbeat. It does not want the heartbeat
120 * to stop while a dlm domain is still active.
122 static unsigned int o2hb_dependent_users;
125 * In global heartbeat mode, all regions are pinned if there are one or more
126 * dependent users and the quorum region count is <= O2HB_PIN_CUT_OFF. All
127 * regions are unpinned if the region count exceeds the cut off or the number
128 * of dependent users falls to zero.
130 #define O2HB_PIN_CUT_OFF 3
133 * In local heartbeat mode, we assume the dlm domain name to be the same as
134 * region uuid. This is true for domains created for the file system but not
135 * necessarily true for userdlm domains. This is a known limitation.
137 * In global heartbeat mode, we pin/unpin all o2hb regions. This solution
138 * works for both file system and userdlm domains.
140 static int o2hb_region_pin(const char *region_uuid);
141 static void o2hb_region_unpin(const char *region_uuid);
143 /* Only sets a new threshold if there are no active regions.
145 * No locking or otherwise interesting code is required for reading
146 * o2hb_dead_threshold as it can't change once regions are active and
147 * it's not interesting to anyone until then anyway. */
148 static void o2hb_dead_threshold_set(unsigned int threshold)
150 if (threshold > O2HB_MIN_DEAD_THRESHOLD) {
151 spin_lock(&o2hb_live_lock);
152 if (list_empty(&o2hb_all_regions))
153 o2hb_dead_threshold = threshold;
154 spin_unlock(&o2hb_live_lock);
158 static int o2hb_global_heartbeat_mode_set(unsigned int hb_mode)
162 if (hb_mode < O2HB_HEARTBEAT_NUM_MODES) {
163 spin_lock(&o2hb_live_lock);
164 if (list_empty(&o2hb_all_regions)) {
165 o2hb_heartbeat_mode = hb_mode;
168 spin_unlock(&o2hb_live_lock);
174 struct o2hb_node_event {
175 struct list_head hn_item;
176 enum o2hb_callback_type hn_event_type;
177 struct o2nm_node *hn_node;
181 struct o2hb_disk_slot {
182 struct o2hb_disk_heartbeat_block *ds_raw_block;
185 u64 ds_last_generation;
186 u16 ds_equal_samples;
187 u16 ds_changed_samples;
188 struct list_head ds_live_item;
191 /* each thread owns a region.. when we're asked to tear down the region
192 * we ask the thread to stop, who cleans up the region */
194 struct config_item hr_item;
196 struct list_head hr_all_item;
197 unsigned hr_unclean_stop:1,
203 /* protected by the hr_callback_sem */
204 struct task_struct *hr_task;
206 unsigned int hr_blocks;
207 unsigned long long hr_start_block;
209 unsigned int hr_block_bits;
210 unsigned int hr_block_bytes;
212 unsigned int hr_slots_per_page;
213 unsigned int hr_num_pages;
215 struct page **hr_slot_data;
216 struct block_device *hr_bdev;
217 struct o2hb_disk_slot *hr_slots;
219 /* live node map of this region */
220 unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
221 unsigned int hr_region_num;
223 struct dentry *hr_debug_dir;
224 struct o2hb_debug_buf *hr_db_livenodes;
225 struct o2hb_debug_buf *hr_db_regnum;
226 struct o2hb_debug_buf *hr_db_elapsed_time;
227 struct o2hb_debug_buf *hr_db_pinned;
229 /* let the person setting up hb wait for it to return until it
230 * has reached a 'steady' state. This will be fixed when we have
231 * a more complete api that doesn't lead to this sort of fragility. */
232 atomic_t hr_steady_iterations;
234 /* terminate o2hb thread if it does not reach steady state
235 * (hr_steady_iterations == 0) within hr_unsteady_iterations */
236 atomic_t hr_unsteady_iterations;
238 char hr_dev_name[BDEVNAME_SIZE];
240 unsigned int hr_timeout_ms;
242 /* randomized as the region goes up and down so that a node
243 * recognizes a node going up and down in one iteration */
246 struct delayed_work hr_write_timeout_work;
247 unsigned long hr_last_timeout_start;
249 /* negotiate timer, used to negotiate extending hb timeout. */
250 struct delayed_work hr_nego_timeout_work;
251 unsigned long hr_nego_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
253 /* Used during o2hb_check_slot to hold a copy of the block
254 * being checked because we temporarily have to zero out the
256 struct o2hb_disk_heartbeat_block *hr_tmp_block;
258 /* Message key for negotiate timeout message. */
260 struct list_head hr_handler_list;
262 /* last hb status, 0 for success, other value for error. */
263 int hr_last_hb_status;
266 struct o2hb_bio_wait_ctxt {
267 atomic_t wc_num_reqs;
268 struct completion wc_io_complete;
272 #define O2HB_NEGO_TIMEOUT_MS (O2HB_MAX_WRITE_TIMEOUT_MS/2)
275 O2HB_NEGO_TIMEOUT_MSG = 1,
276 O2HB_NEGO_APPROVE_MSG = 2,
279 struct o2hb_nego_msg {
283 static void o2hb_write_timeout(struct work_struct *work)
286 struct o2hb_region *reg =
287 container_of(work, struct o2hb_region,
288 hr_write_timeout_work.work);
290 mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u "
291 "milliseconds\n", reg->hr_dev_name,
292 jiffies_to_msecs(jiffies - reg->hr_last_timeout_start));
294 if (o2hb_global_heartbeat_active()) {
295 spin_lock(&o2hb_live_lock);
296 if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
297 set_bit(reg->hr_region_num, o2hb_failed_region_bitmap);
298 failed = bitmap_weight(o2hb_failed_region_bitmap,
300 quorum = bitmap_weight(o2hb_quorum_region_bitmap,
302 spin_unlock(&o2hb_live_lock);
304 mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n",
308 * Fence if the number of failed regions >= half the number
311 if ((failed << 1) < quorum)
315 o2quo_disk_timeout();
318 static void o2hb_arm_timeout(struct o2hb_region *reg)
320 /* Arm writeout only after thread reaches steady state */
321 if (atomic_read(®->hr_steady_iterations) != 0)
324 mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n",
325 O2HB_MAX_WRITE_TIMEOUT_MS);
327 if (o2hb_global_heartbeat_active()) {
328 spin_lock(&o2hb_live_lock);
329 clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap);
330 spin_unlock(&o2hb_live_lock);
332 cancel_delayed_work(®->hr_write_timeout_work);
333 schedule_delayed_work(®->hr_write_timeout_work,
334 msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS));
336 cancel_delayed_work(®->hr_nego_timeout_work);
337 /* negotiate timeout must be less than write timeout. */
338 schedule_delayed_work(®->hr_nego_timeout_work,
339 msecs_to_jiffies(O2HB_NEGO_TIMEOUT_MS));
340 memset(reg->hr_nego_node_bitmap, 0, sizeof(reg->hr_nego_node_bitmap));
343 static void o2hb_disarm_timeout(struct o2hb_region *reg)
345 cancel_delayed_work_sync(®->hr_write_timeout_work);
346 cancel_delayed_work_sync(®->hr_nego_timeout_work);
349 static int o2hb_send_nego_msg(int key, int type, u8 target)
351 struct o2hb_nego_msg msg;
354 msg.node_num = o2nm_this_node();
356 ret = o2net_send_message(type, key, &msg, sizeof(msg),
359 if (ret == -EAGAIN || ret == -ENOMEM) {
367 static void o2hb_nego_timeout(struct work_struct *work)
369 unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
370 int master_node, i, ret;
371 struct o2hb_region *reg;
373 reg = container_of(work, struct o2hb_region, hr_nego_timeout_work.work);
374 /* don't negotiate timeout if last hb failed since it is very
375 * possible io failed. Should let write timeout fence self.
377 if (reg->hr_last_hb_status)
380 o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap));
381 /* lowest node as master node to make negotiate decision. */
382 master_node = find_first_bit(live_node_bitmap, O2NM_MAX_NODES);
384 if (master_node == o2nm_this_node()) {
385 if (!test_bit(master_node, reg->hr_nego_node_bitmap)) {
386 printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%s).\n",
387 o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000,
388 config_item_name(®->hr_item), reg->hr_dev_name);
389 set_bit(master_node, reg->hr_nego_node_bitmap);
391 if (memcmp(reg->hr_nego_node_bitmap, live_node_bitmap,
392 sizeof(reg->hr_nego_node_bitmap))) {
393 /* check negotiate bitmap every second to do timeout
396 schedule_delayed_work(®->hr_nego_timeout_work,
397 msecs_to_jiffies(1000));
402 printk(KERN_NOTICE "o2hb: all nodes hb write hung, maybe region %s (%s) is down.\n",
403 config_item_name(®->hr_item), reg->hr_dev_name);
404 /* approve negotiate timeout request. */
405 o2hb_arm_timeout(reg);
408 while ((i = find_next_bit(live_node_bitmap,
409 O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
410 if (i == master_node)
413 mlog(ML_HEARTBEAT, "send NEGO_APPROVE msg to node %d\n", i);
414 ret = o2hb_send_nego_msg(reg->hr_key,
415 O2HB_NEGO_APPROVE_MSG, i);
417 mlog(ML_ERROR, "send NEGO_APPROVE msg to node %d fail %d\n",
421 /* negotiate timeout with master node. */
422 printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%s), negotiate timeout with node %d.\n",
423 o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000, config_item_name(®->hr_item),
424 reg->hr_dev_name, master_node);
425 ret = o2hb_send_nego_msg(reg->hr_key, O2HB_NEGO_TIMEOUT_MSG,
428 mlog(ML_ERROR, "send NEGO_TIMEOUT msg to node %d fail %d\n",
433 static int o2hb_nego_timeout_handler(struct o2net_msg *msg, u32 len, void *data,
436 struct o2hb_region *reg = data;
437 struct o2hb_nego_msg *nego_msg;
439 nego_msg = (struct o2hb_nego_msg *)msg->buf;
440 printk(KERN_NOTICE "o2hb: receive negotiate timeout message from node %d on region %s (%s).\n",
441 nego_msg->node_num, config_item_name(®->hr_item), reg->hr_dev_name);
442 if (nego_msg->node_num < O2NM_MAX_NODES)
443 set_bit(nego_msg->node_num, reg->hr_nego_node_bitmap);
445 mlog(ML_ERROR, "got nego timeout message from bad node.\n");
450 static int o2hb_nego_approve_handler(struct o2net_msg *msg, u32 len, void *data,
453 struct o2hb_region *reg = data;
455 printk(KERN_NOTICE "o2hb: negotiate timeout approved by master node on region %s (%s).\n",
456 config_item_name(®->hr_item), reg->hr_dev_name);
457 o2hb_arm_timeout(reg);
461 static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc)
463 atomic_set(&wc->wc_num_reqs, 1);
464 init_completion(&wc->wc_io_complete);
468 /* Used in error paths too */
469 static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc,
472 /* sadly atomic_sub_and_test() isn't available on all platforms. The
473 * good news is that the fast path only completes one at a time */
475 if (atomic_dec_and_test(&wc->wc_num_reqs)) {
477 complete(&wc->wc_io_complete);
482 static void o2hb_wait_on_io(struct o2hb_bio_wait_ctxt *wc)
484 o2hb_bio_wait_dec(wc, 1);
485 wait_for_completion(&wc->wc_io_complete);
488 static void o2hb_bio_end_io(struct bio *bio)
490 struct o2hb_bio_wait_ctxt *wc = bio->bi_private;
492 if (bio->bi_status) {
493 mlog(ML_ERROR, "IO Error %d\n", bio->bi_status);
494 wc->wc_error = blk_status_to_errno(bio->bi_status);
497 o2hb_bio_wait_dec(wc, 1);
501 /* Setup a Bio to cover I/O against num_slots slots starting at
503 static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg,
504 struct o2hb_bio_wait_ctxt *wc,
505 unsigned int *current_slot,
506 unsigned int max_slots, int op,
509 int len, current_page;
510 unsigned int vec_len, vec_start;
511 unsigned int bits = reg->hr_block_bits;
512 unsigned int spp = reg->hr_slots_per_page;
513 unsigned int cs = *current_slot;
517 /* Testing has shown this allocation to take long enough under
518 * GFP_KERNEL that the local node can get fenced. It would be
519 * nicest if we could pre-allocate these bios and avoid this
521 bio = bio_alloc(reg->hr_bdev, 16, op | op_flags, GFP_ATOMIC);
523 mlog(ML_ERROR, "Could not alloc slots BIO!\n");
524 bio = ERR_PTR(-ENOMEM);
528 /* Must put everything in 512 byte sectors for the bio... */
529 bio->bi_iter.bi_sector = (reg->hr_start_block + cs) << (bits - 9);
530 bio->bi_private = wc;
531 bio->bi_end_io = o2hb_bio_end_io;
533 vec_start = (cs << bits) % PAGE_SIZE;
534 while(cs < max_slots) {
535 current_page = cs / spp;
536 page = reg->hr_slot_data[current_page];
538 vec_len = min(PAGE_SIZE - vec_start,
539 (max_slots-cs) * (PAGE_SIZE/spp) );
541 mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n",
542 current_page, vec_len, vec_start);
544 len = bio_add_page(bio, page, vec_len, vec_start);
545 if (len != vec_len) break;
547 cs += vec_len / (PAGE_SIZE/spp);
556 static int o2hb_read_slots(struct o2hb_region *reg,
557 unsigned int begin_slot,
558 unsigned int max_slots)
560 unsigned int current_slot = begin_slot;
562 struct o2hb_bio_wait_ctxt wc;
565 o2hb_bio_wait_init(&wc);
567 while(current_slot < max_slots) {
568 bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots,
571 status = PTR_ERR(bio);
576 atomic_inc(&wc.wc_num_reqs);
583 o2hb_wait_on_io(&wc);
584 if (wc.wc_error && !status)
585 status = wc.wc_error;
590 static int o2hb_issue_node_write(struct o2hb_region *reg,
591 struct o2hb_bio_wait_ctxt *write_wc)
597 o2hb_bio_wait_init(write_wc);
599 slot = o2nm_this_node();
601 bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1, REQ_OP_WRITE,
604 status = PTR_ERR(bio);
609 atomic_inc(&write_wc->wc_num_reqs);
617 static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg,
618 struct o2hb_disk_heartbeat_block *hb_block)
623 /* We want to compute the block crc with a 0 value in the
624 * hb_cksum field. Save it off here and replace after the
626 old_cksum = hb_block->hb_cksum;
627 hb_block->hb_cksum = 0;
629 ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes);
631 hb_block->hb_cksum = old_cksum;
636 static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block)
638 mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, "
639 "cksum = 0x%x, generation 0x%llx\n",
640 (long long)le64_to_cpu(hb_block->hb_seq),
641 hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum),
642 (long long)le64_to_cpu(hb_block->hb_generation));
645 static int o2hb_verify_crc(struct o2hb_region *reg,
646 struct o2hb_disk_heartbeat_block *hb_block)
650 read = le32_to_cpu(hb_block->hb_cksum);
651 computed = o2hb_compute_block_crc_le(reg, hb_block);
653 return read == computed;
657 * Compare the slot data with what we wrote in the last iteration.
658 * If the match fails, print an appropriate error message. This is to
659 * detect errors like... another node hearting on the same slot,
660 * flaky device that is losing writes, etc.
661 * Returns 1 if check succeeds, 0 otherwise.
663 static int o2hb_check_own_slot(struct o2hb_region *reg)
665 struct o2hb_disk_slot *slot;
666 struct o2hb_disk_heartbeat_block *hb_block;
669 slot = ®->hr_slots[o2nm_this_node()];
670 /* Don't check on our 1st timestamp */
671 if (!slot->ds_last_time)
674 hb_block = slot->ds_raw_block;
675 if (le64_to_cpu(hb_block->hb_seq) == slot->ds_last_time &&
676 le64_to_cpu(hb_block->hb_generation) == slot->ds_last_generation &&
677 hb_block->hb_node == slot->ds_node_num)
680 #define ERRSTR1 "Another node is heartbeating on device"
681 #define ERRSTR2 "Heartbeat generation mismatch on device"
682 #define ERRSTR3 "Heartbeat sequence mismatch on device"
684 if (hb_block->hb_node != slot->ds_node_num)
686 else if (le64_to_cpu(hb_block->hb_generation) !=
687 slot->ds_last_generation)
692 mlog(ML_ERROR, "%s (%s): expected(%u:0x%llx, 0x%llx), "
693 "ondisk(%u:0x%llx, 0x%llx)\n", errstr, reg->hr_dev_name,
694 slot->ds_node_num, (unsigned long long)slot->ds_last_generation,
695 (unsigned long long)slot->ds_last_time, hb_block->hb_node,
696 (unsigned long long)le64_to_cpu(hb_block->hb_generation),
697 (unsigned long long)le64_to_cpu(hb_block->hb_seq));
702 static inline void o2hb_prepare_block(struct o2hb_region *reg,
707 struct o2hb_disk_slot *slot;
708 struct o2hb_disk_heartbeat_block *hb_block;
710 node_num = o2nm_this_node();
711 slot = ®->hr_slots[node_num];
713 hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block;
714 memset(hb_block, 0, reg->hr_block_bytes);
715 /* TODO: time stuff */
716 cputime = ktime_get_real_seconds();
720 hb_block->hb_seq = cpu_to_le64(cputime);
721 hb_block->hb_node = node_num;
722 hb_block->hb_generation = cpu_to_le64(generation);
723 hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS);
725 /* This step must always happen last! */
726 hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg,
729 mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n",
730 (long long)generation,
731 le32_to_cpu(hb_block->hb_cksum));
734 static void o2hb_fire_callbacks(struct o2hb_callback *hbcall,
735 struct o2nm_node *node,
738 struct o2hb_callback_func *f;
740 list_for_each_entry(f, &hbcall->list, hc_item) {
741 mlog(ML_HEARTBEAT, "calling funcs %p\n", f);
742 (f->hc_func)(node, idx, f->hc_data);
746 /* Will run the list in order until we process the passed event */
747 static void o2hb_run_event_list(struct o2hb_node_event *queued_event)
749 struct o2hb_callback *hbcall;
750 struct o2hb_node_event *event;
752 /* Holding callback sem assures we don't alter the callback
753 * lists when doing this, and serializes ourselves with other
754 * processes wanting callbacks. */
755 down_write(&o2hb_callback_sem);
757 spin_lock(&o2hb_live_lock);
758 while (!list_empty(&o2hb_node_events)
759 && !list_empty(&queued_event->hn_item)) {
760 event = list_entry(o2hb_node_events.next,
761 struct o2hb_node_event,
763 list_del_init(&event->hn_item);
764 spin_unlock(&o2hb_live_lock);
766 mlog(ML_HEARTBEAT, "Node %s event for %d\n",
767 event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN",
770 hbcall = hbcall_from_type(event->hn_event_type);
772 /* We should *never* have gotten on to the list with a
773 * bad type... This isn't something that we should try
774 * to recover from. */
775 BUG_ON(IS_ERR(hbcall));
777 o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num);
779 spin_lock(&o2hb_live_lock);
781 spin_unlock(&o2hb_live_lock);
783 up_write(&o2hb_callback_sem);
786 static void o2hb_queue_node_event(struct o2hb_node_event *event,
787 enum o2hb_callback_type type,
788 struct o2nm_node *node,
791 assert_spin_locked(&o2hb_live_lock);
793 BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB));
795 event->hn_event_type = type;
796 event->hn_node = node;
797 event->hn_node_num = node_num;
799 mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n",
800 type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num);
802 list_add_tail(&event->hn_item, &o2hb_node_events);
805 static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot)
807 struct o2hb_node_event event =
808 { .hn_item = LIST_HEAD_INIT(event.hn_item), };
809 struct o2nm_node *node;
812 node = o2nm_get_node_by_num(slot->ds_node_num);
816 spin_lock(&o2hb_live_lock);
817 if (!list_empty(&slot->ds_live_item)) {
818 mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n",
821 list_del_init(&slot->ds_live_item);
823 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
824 clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
826 o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node,
831 spin_unlock(&o2hb_live_lock);
834 o2hb_run_event_list(&event);
839 static void o2hb_set_quorum_device(struct o2hb_region *reg)
841 if (!o2hb_global_heartbeat_active())
844 /* Prevent race with o2hb_heartbeat_group_drop_item() */
845 if (kthread_should_stop())
848 /* Tag region as quorum only after thread reaches steady state */
849 if (atomic_read(®->hr_steady_iterations) != 0)
852 spin_lock(&o2hb_live_lock);
854 if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
858 * A region can be added to the quorum only when it sees all
859 * live nodes heartbeat on it. In other words, the region has been
860 * added to all nodes.
862 if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap,
863 sizeof(o2hb_live_node_bitmap)))
866 printk(KERN_NOTICE "o2hb: Region %s (%s) is now a quorum device\n",
867 config_item_name(®->hr_item), reg->hr_dev_name);
869 set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
872 * If global heartbeat active, unpin all regions if the
873 * region count > CUT_OFF
875 if (bitmap_weight(o2hb_quorum_region_bitmap,
876 O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF)
877 o2hb_region_unpin(NULL);
879 spin_unlock(&o2hb_live_lock);
882 static int o2hb_check_slot(struct o2hb_region *reg,
883 struct o2hb_disk_slot *slot)
885 int changed = 0, gen_changed = 0;
886 struct o2hb_node_event event =
887 { .hn_item = LIST_HEAD_INIT(event.hn_item), };
888 struct o2nm_node *node;
889 struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block;
891 unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS;
892 unsigned int slot_dead_ms;
896 memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes);
899 * If a node is no longer configured but is still in the livemap, we
900 * may need to clear that bit from the livemap.
902 node = o2nm_get_node_by_num(slot->ds_node_num);
904 spin_lock(&o2hb_live_lock);
905 tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap);
906 spin_unlock(&o2hb_live_lock);
911 if (!o2hb_verify_crc(reg, hb_block)) {
912 /* all paths from here will drop o2hb_live_lock for
914 spin_lock(&o2hb_live_lock);
916 /* Don't print an error on the console in this case -
917 * a freshly formatted heartbeat area will not have a
919 if (list_empty(&slot->ds_live_item))
922 /* The node is live but pushed out a bad crc. We
923 * consider it a transient miss but don't populate any
924 * other values as they may be junk. */
925 mlog(ML_ERROR, "Node %d has written a bad crc to %s\n",
926 slot->ds_node_num, reg->hr_dev_name);
927 o2hb_dump_slot(hb_block);
929 slot->ds_equal_samples++;
933 /* we don't care if these wrap.. the state transitions below
934 * clear at the right places */
935 cputime = le64_to_cpu(hb_block->hb_seq);
936 if (slot->ds_last_time != cputime)
937 slot->ds_changed_samples++;
939 slot->ds_equal_samples++;
940 slot->ds_last_time = cputime;
942 /* The node changed heartbeat generations. We assume this to
943 * mean it dropped off but came back before we timed out. We
944 * want to consider it down for the time being but don't want
945 * to lose any changed_samples state we might build up to
946 * considering it live again. */
947 if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) {
949 slot->ds_equal_samples = 0;
950 mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx "
951 "to 0x%llx)\n", slot->ds_node_num,
952 (long long)slot->ds_last_generation,
953 (long long)le64_to_cpu(hb_block->hb_generation));
956 slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
958 mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x "
959 "seq %llu last %llu changed %u equal %u\n",
960 slot->ds_node_num, (long long)slot->ds_last_generation,
961 le32_to_cpu(hb_block->hb_cksum),
962 (unsigned long long)le64_to_cpu(hb_block->hb_seq),
963 (unsigned long long)slot->ds_last_time, slot->ds_changed_samples,
964 slot->ds_equal_samples);
966 spin_lock(&o2hb_live_lock);
969 /* dead nodes only come to life after some number of
970 * changes at any time during their dead time */
971 if (list_empty(&slot->ds_live_item) &&
972 slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) {
973 mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n",
974 slot->ds_node_num, (long long)slot->ds_last_generation);
976 set_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
978 /* first on the list generates a callback */
979 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
980 mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes "
981 "bitmap\n", slot->ds_node_num);
982 set_bit(slot->ds_node_num, o2hb_live_node_bitmap);
984 o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node,
991 list_add_tail(&slot->ds_live_item,
992 &o2hb_live_slots[slot->ds_node_num]);
994 slot->ds_equal_samples = 0;
996 /* We want to be sure that all nodes agree on the
997 * number of milliseconds before a node will be
998 * considered dead. The self-fencing timeout is
999 * computed from this value, and a discrepancy might
1000 * result in heartbeat calling a node dead when it
1001 * hasn't self-fenced yet. */
1002 slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms);
1003 if (slot_dead_ms && slot_dead_ms != dead_ms) {
1004 /* TODO: Perhaps we can fail the region here. */
1005 mlog(ML_ERROR, "Node %d on device %s has a dead count "
1006 "of %u ms, but our count is %u ms.\n"
1007 "Please double check your configuration values "
1008 "for 'O2CB_HEARTBEAT_THRESHOLD'\n",
1009 slot->ds_node_num, reg->hr_dev_name, slot_dead_ms,
1015 /* if the list is dead, we're done.. */
1016 if (list_empty(&slot->ds_live_item))
1019 /* live nodes only go dead after enough consequtive missed
1020 * samples.. reset the missed counter whenever we see
1022 if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) {
1023 mlog(ML_HEARTBEAT, "Node %d left my region\n",
1026 clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
1028 /* last off the live_slot generates a callback */
1029 list_del_init(&slot->ds_live_item);
1030 if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
1031 mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live "
1032 "nodes bitmap\n", slot->ds_node_num);
1033 clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
1035 /* node can be null */
1036 o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB,
1037 node, slot->ds_node_num);
1043 /* We don't clear this because the node is still
1044 * actually writing new blocks. */
1046 slot->ds_changed_samples = 0;
1049 if (slot->ds_changed_samples) {
1050 slot->ds_changed_samples = 0;
1051 slot->ds_equal_samples = 0;
1054 spin_unlock(&o2hb_live_lock);
1057 o2hb_run_event_list(&event);
1060 o2nm_node_put(node);
1064 static int o2hb_highest_node(unsigned long *nodes, int numbits)
1066 return find_last_bit(nodes, numbits);
1069 static int o2hb_lowest_node(unsigned long *nodes, int numbits)
1071 return find_first_bit(nodes, numbits);
1074 static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
1076 int i, ret, highest_node, lowest_node;
1077 int membership_change = 0, own_slot_ok = 0;
1078 unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)];
1079 unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
1080 struct o2hb_bio_wait_ctxt write_wc;
1082 ret = o2nm_configured_node_map(configured_nodes,
1083 sizeof(configured_nodes));
1090 * If a node is not configured but is in the livemap, we still need
1091 * to read the slot so as to be able to remove it from the livemap.
1093 o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap));
1095 while ((i = find_next_bit(live_node_bitmap,
1096 O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
1097 set_bit(i, configured_nodes);
1100 highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES);
1101 lowest_node = o2hb_lowest_node(configured_nodes, O2NM_MAX_NODES);
1102 if (highest_node >= O2NM_MAX_NODES || lowest_node >= O2NM_MAX_NODES) {
1103 mlog(ML_NOTICE, "o2hb: No configured nodes found!\n");
1108 /* No sense in reading the slots of nodes that don't exist
1109 * yet. Of course, if the node definitions have holes in them
1110 * then we're reading an empty slot anyway... Consider this
1112 ret = o2hb_read_slots(reg, lowest_node, highest_node + 1);
1118 /* With an up to date view of the slots, we can check that no
1119 * other node has been improperly configured to heartbeat in
1121 own_slot_ok = o2hb_check_own_slot(reg);
1123 /* fill in the proper info for our next heartbeat */
1124 o2hb_prepare_block(reg, reg->hr_generation);
1126 ret = o2hb_issue_node_write(reg, &write_wc);
1133 while((i = find_next_bit(configured_nodes,
1134 O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
1135 membership_change |= o2hb_check_slot(reg, ®->hr_slots[i]);
1139 * We have to be sure we've advertised ourselves on disk
1140 * before we can go to steady state. This ensures that
1141 * people we find in our steady state have seen us.
1143 o2hb_wait_on_io(&write_wc);
1144 if (write_wc.wc_error) {
1145 /* Do not re-arm the write timeout on I/O error - we
1146 * can't be sure that the new block ever made it to
1148 mlog(ML_ERROR, "Write error %d on device \"%s\"\n",
1149 write_wc.wc_error, reg->hr_dev_name);
1150 ret = write_wc.wc_error;
1154 /* Skip disarming the timeout if own slot has stale/bad data */
1156 o2hb_set_quorum_device(reg);
1157 o2hb_arm_timeout(reg);
1158 reg->hr_last_timeout_start = jiffies;
1162 /* let the person who launched us know when things are steady */
1163 if (atomic_read(®->hr_steady_iterations) != 0) {
1164 if (!ret && own_slot_ok && !membership_change) {
1165 if (atomic_dec_and_test(®->hr_steady_iterations))
1166 wake_up(&o2hb_steady_queue);
1170 if (atomic_read(®->hr_steady_iterations) != 0) {
1171 if (atomic_dec_and_test(®->hr_unsteady_iterations)) {
1172 printk(KERN_NOTICE "o2hb: Unable to stabilize "
1173 "heartbeat on region %s (%s)\n",
1174 config_item_name(®->hr_item),
1176 atomic_set(®->hr_steady_iterations, 0);
1177 reg->hr_aborted_start = 1;
1178 wake_up(&o2hb_steady_queue);
1187 * we ride the region ref that the region dir holds. before the region
1188 * dir is removed and drops it ref it will wait to tear down this
1191 static int o2hb_thread(void *data)
1194 struct o2hb_region *reg = data;
1195 struct o2hb_bio_wait_ctxt write_wc;
1196 ktime_t before_hb, after_hb;
1197 unsigned int elapsed_msec;
1199 mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n");
1201 set_user_nice(current, MIN_NICE);
1204 ret = o2nm_depend_this_node();
1206 mlog(ML_ERROR, "Node has been deleted, ret = %d\n", ret);
1207 reg->hr_node_deleted = 1;
1208 wake_up(&o2hb_steady_queue);
1212 while (!kthread_should_stop() &&
1213 !reg->hr_unclean_stop && !reg->hr_aborted_start) {
1214 /* We track the time spent inside
1215 * o2hb_do_disk_heartbeat so that we avoid more than
1216 * hr_timeout_ms between disk writes. On busy systems
1217 * this should result in a heartbeat which is less
1218 * likely to time itself out. */
1219 before_hb = ktime_get_real();
1221 ret = o2hb_do_disk_heartbeat(reg);
1222 reg->hr_last_hb_status = ret;
1224 after_hb = ktime_get_real();
1226 elapsed_msec = (unsigned int)
1227 ktime_ms_delta(after_hb, before_hb);
1230 "start = %lld, end = %lld, msec = %u, ret = %d\n",
1231 before_hb, after_hb, elapsed_msec, ret);
1233 if (!kthread_should_stop() &&
1234 elapsed_msec < reg->hr_timeout_ms) {
1235 /* the kthread api has blocked signals for us so no
1236 * need to record the return value. */
1237 msleep_interruptible(reg->hr_timeout_ms - elapsed_msec);
1241 o2hb_disarm_timeout(reg);
1243 /* unclean stop is only used in very bad situation */
1244 for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++)
1245 o2hb_shutdown_slot(®->hr_slots[i]);
1247 /* Explicit down notification - avoid forcing the other nodes
1248 * to timeout on this region when we could just as easily
1249 * write a clear generation - thus indicating to them that
1250 * this node has left this region.
1252 if (!reg->hr_unclean_stop && !reg->hr_aborted_start) {
1253 o2hb_prepare_block(reg, 0);
1254 ret = o2hb_issue_node_write(reg, &write_wc);
1256 o2hb_wait_on_io(&write_wc);
1262 o2nm_undepend_this_node();
1264 mlog(ML_HEARTBEAT|ML_KTHREAD, "o2hb thread exiting\n");
1269 #ifdef CONFIG_DEBUG_FS
1270 static int o2hb_debug_open(struct inode *inode, struct file *file)
1272 struct o2hb_debug_buf *db = inode->i_private;
1273 struct o2hb_region *reg;
1274 unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1280 /* max_nodes should be the largest bitmap we pass here */
1281 BUG_ON(sizeof(map) < db->db_size);
1283 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1287 switch (db->db_type) {
1288 case O2HB_DB_TYPE_LIVENODES:
1289 case O2HB_DB_TYPE_LIVEREGIONS:
1290 case O2HB_DB_TYPE_QUORUMREGIONS:
1291 case O2HB_DB_TYPE_FAILEDREGIONS:
1292 spin_lock(&o2hb_live_lock);
1293 memcpy(map, db->db_data, db->db_size);
1294 spin_unlock(&o2hb_live_lock);
1297 case O2HB_DB_TYPE_REGION_LIVENODES:
1298 spin_lock(&o2hb_live_lock);
1299 reg = (struct o2hb_region *)db->db_data;
1300 memcpy(map, reg->hr_live_node_bitmap, db->db_size);
1301 spin_unlock(&o2hb_live_lock);
1304 case O2HB_DB_TYPE_REGION_NUMBER:
1305 reg = (struct o2hb_region *)db->db_data;
1306 out += scnprintf(buf + out, PAGE_SIZE - out, "%d\n",
1307 reg->hr_region_num);
1310 case O2HB_DB_TYPE_REGION_ELAPSED_TIME:
1311 reg = (struct o2hb_region *)db->db_data;
1312 lts = reg->hr_last_timeout_start;
1313 /* If 0, it has never been set before */
1315 lts = jiffies_to_msecs(jiffies - lts);
1316 out += scnprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts);
1319 case O2HB_DB_TYPE_REGION_PINNED:
1320 reg = (struct o2hb_region *)db->db_data;
1321 out += scnprintf(buf + out, PAGE_SIZE - out, "%u\n",
1322 !!reg->hr_item_pinned);
1329 while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len)
1330 out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i);
1331 out += scnprintf(buf + out, PAGE_SIZE - out, "\n");
1334 i_size_write(inode, out);
1336 file->private_data = buf;
1343 static int o2hb_debug_release(struct inode *inode, struct file *file)
1345 kfree(file->private_data);
1349 static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
1350 size_t nbytes, loff_t *ppos)
1352 return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
1353 i_size_read(file->f_mapping->host));
1356 static int o2hb_debug_open(struct inode *inode, struct file *file)
1360 static int o2hb_debug_release(struct inode *inode, struct file *file)
1364 static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
1365 size_t nbytes, loff_t *ppos)
1369 #endif /* CONFIG_DEBUG_FS */
1371 static const struct file_operations o2hb_debug_fops = {
1372 .open = o2hb_debug_open,
1373 .release = o2hb_debug_release,
1374 .read = o2hb_debug_read,
1375 .llseek = generic_file_llseek,
1378 void o2hb_exit(void)
1380 debugfs_remove_recursive(o2hb_debug_dir);
1381 kfree(o2hb_db_livenodes);
1382 kfree(o2hb_db_liveregions);
1383 kfree(o2hb_db_quorumregions);
1384 kfree(o2hb_db_failedregions);
1387 static void o2hb_debug_create(const char *name, struct dentry *dir,
1388 struct o2hb_debug_buf **db, int db_len, int type,
1389 int size, int len, void *data)
1391 *db = kmalloc(db_len, GFP_KERNEL);
1395 (*db)->db_type = type;
1396 (*db)->db_size = size;
1397 (*db)->db_len = len;
1398 (*db)->db_data = data;
1400 debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db, &o2hb_debug_fops);
1403 static void o2hb_debug_init(void)
1405 o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
1407 o2hb_debug_create(O2HB_DEBUG_LIVENODES, o2hb_debug_dir,
1408 &o2hb_db_livenodes, sizeof(*o2hb_db_livenodes),
1409 O2HB_DB_TYPE_LIVENODES, sizeof(o2hb_live_node_bitmap),
1410 O2NM_MAX_NODES, o2hb_live_node_bitmap);
1412 o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS, o2hb_debug_dir,
1413 &o2hb_db_liveregions, sizeof(*o2hb_db_liveregions),
1414 O2HB_DB_TYPE_LIVEREGIONS,
1415 sizeof(o2hb_live_region_bitmap), O2NM_MAX_REGIONS,
1416 o2hb_live_region_bitmap);
1418 o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS, o2hb_debug_dir,
1419 &o2hb_db_quorumregions,
1420 sizeof(*o2hb_db_quorumregions),
1421 O2HB_DB_TYPE_QUORUMREGIONS,
1422 sizeof(o2hb_quorum_region_bitmap), O2NM_MAX_REGIONS,
1423 o2hb_quorum_region_bitmap);
1425 o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS, o2hb_debug_dir,
1426 &o2hb_db_failedregions,
1427 sizeof(*o2hb_db_failedregions),
1428 O2HB_DB_TYPE_FAILEDREGIONS,
1429 sizeof(o2hb_failed_region_bitmap), O2NM_MAX_REGIONS,
1430 o2hb_failed_region_bitmap);
1433 void o2hb_init(void)
1437 for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++)
1438 INIT_LIST_HEAD(&o2hb_callbacks[i].list);
1440 for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++)
1441 INIT_LIST_HEAD(&o2hb_live_slots[i]);
1443 memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
1444 memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap));
1445 memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap));
1446 memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap));
1447 memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap));
1449 o2hb_dependent_users = 0;
1454 /* if we're already in a callback then we're already serialized by the sem */
1455 static void o2hb_fill_node_map_from_callback(unsigned long *map,
1458 BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
1460 memcpy(map, &o2hb_live_node_bitmap, bytes);
1464 * get a map of all nodes that are heartbeating in any regions
1466 void o2hb_fill_node_map(unsigned long *map, unsigned bytes)
1468 /* callers want to serialize this map and callbacks so that they
1469 * can trust that they don't miss nodes coming to the party */
1470 down_read(&o2hb_callback_sem);
1471 spin_lock(&o2hb_live_lock);
1472 o2hb_fill_node_map_from_callback(map, bytes);
1473 spin_unlock(&o2hb_live_lock);
1474 up_read(&o2hb_callback_sem);
1476 EXPORT_SYMBOL_GPL(o2hb_fill_node_map);
1479 * heartbeat configfs bits. The heartbeat set is a default set under
1480 * the cluster set in nodemanager.c.
1483 static struct o2hb_region *to_o2hb_region(struct config_item *item)
1485 return item ? container_of(item, struct o2hb_region, hr_item) : NULL;
1488 /* drop_item only drops its ref after killing the thread, nothing should
1489 * be using the region anymore. this has to clean up any state that
1490 * attributes might have built up. */
1491 static void o2hb_region_release(struct config_item *item)
1495 struct o2hb_region *reg = to_o2hb_region(item);
1497 mlog(ML_HEARTBEAT, "hb region release (%s)\n", reg->hr_dev_name);
1499 kfree(reg->hr_tmp_block);
1501 if (reg->hr_slot_data) {
1502 for (i = 0; i < reg->hr_num_pages; i++) {
1503 page = reg->hr_slot_data[i];
1507 kfree(reg->hr_slot_data);
1511 blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
1513 kfree(reg->hr_slots);
1515 debugfs_remove_recursive(reg->hr_debug_dir);
1516 kfree(reg->hr_db_livenodes);
1517 kfree(reg->hr_db_regnum);
1518 kfree(reg->hr_db_elapsed_time);
1519 kfree(reg->hr_db_pinned);
1521 spin_lock(&o2hb_live_lock);
1522 list_del(®->hr_all_item);
1523 spin_unlock(&o2hb_live_lock);
1525 o2net_unregister_handler_list(®->hr_handler_list);
1529 static int o2hb_read_block_input(struct o2hb_region *reg,
1531 unsigned long *ret_bytes,
1532 unsigned int *ret_bits)
1534 unsigned long bytes;
1535 char *p = (char *)page;
1537 bytes = simple_strtoul(p, &p, 0);
1538 if (!p || (*p && (*p != '\n')))
1541 /* Heartbeat and fs min / max block sizes are the same. */
1542 if (bytes > 4096 || bytes < 512)
1544 if (hweight16(bytes) != 1)
1550 *ret_bits = ffs(bytes) - 1;
1555 static ssize_t o2hb_region_block_bytes_show(struct config_item *item,
1558 return sprintf(page, "%u\n", to_o2hb_region(item)->hr_block_bytes);
1561 static ssize_t o2hb_region_block_bytes_store(struct config_item *item,
1565 struct o2hb_region *reg = to_o2hb_region(item);
1567 unsigned long block_bytes;
1568 unsigned int block_bits;
1573 status = o2hb_read_block_input(reg, page, &block_bytes,
1578 reg->hr_block_bytes = (unsigned int)block_bytes;
1579 reg->hr_block_bits = block_bits;
1584 static ssize_t o2hb_region_start_block_show(struct config_item *item,
1587 return sprintf(page, "%llu\n", to_o2hb_region(item)->hr_start_block);
1590 static ssize_t o2hb_region_start_block_store(struct config_item *item,
1594 struct o2hb_region *reg = to_o2hb_region(item);
1595 unsigned long long tmp;
1596 char *p = (char *)page;
1602 ret = kstrtoull(p, 0, &tmp);
1606 reg->hr_start_block = tmp;
1611 static ssize_t o2hb_region_blocks_show(struct config_item *item, char *page)
1613 return sprintf(page, "%d\n", to_o2hb_region(item)->hr_blocks);
1616 static ssize_t o2hb_region_blocks_store(struct config_item *item,
1620 struct o2hb_region *reg = to_o2hb_region(item);
1622 char *p = (char *)page;
1627 tmp = simple_strtoul(p, &p, 0);
1628 if (!p || (*p && (*p != '\n')))
1631 if (tmp > O2NM_MAX_NODES || tmp == 0)
1634 reg->hr_blocks = (unsigned int)tmp;
1639 static ssize_t o2hb_region_dev_show(struct config_item *item, char *page)
1641 unsigned int ret = 0;
1643 if (to_o2hb_region(item)->hr_bdev)
1644 ret = sprintf(page, "%s\n", to_o2hb_region(item)->hr_dev_name);
1649 static void o2hb_init_region_params(struct o2hb_region *reg)
1651 reg->hr_slots_per_page = PAGE_SIZE >> reg->hr_block_bits;
1652 reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS;
1654 mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n",
1655 reg->hr_start_block, reg->hr_blocks);
1656 mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n",
1657 reg->hr_block_bytes, reg->hr_block_bits);
1658 mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms);
1659 mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold);
1662 static int o2hb_map_slot_data(struct o2hb_region *reg)
1665 unsigned int last_slot;
1666 unsigned int spp = reg->hr_slots_per_page;
1669 struct o2hb_disk_slot *slot;
1671 reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL);
1672 if (reg->hr_tmp_block == NULL)
1675 reg->hr_slots = kcalloc(reg->hr_blocks,
1676 sizeof(struct o2hb_disk_slot), GFP_KERNEL);
1677 if (reg->hr_slots == NULL)
1680 for(i = 0; i < reg->hr_blocks; i++) {
1681 slot = ®->hr_slots[i];
1682 slot->ds_node_num = i;
1683 INIT_LIST_HEAD(&slot->ds_live_item);
1684 slot->ds_raw_block = NULL;
1687 reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp;
1688 mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks "
1689 "at %u blocks per page\n",
1690 reg->hr_num_pages, reg->hr_blocks, spp);
1692 reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *),
1694 if (!reg->hr_slot_data)
1697 for(i = 0; i < reg->hr_num_pages; i++) {
1698 page = alloc_page(GFP_KERNEL);
1702 reg->hr_slot_data[i] = page;
1704 last_slot = i * spp;
1705 raw = page_address(page);
1707 (j < spp) && ((j + last_slot) < reg->hr_blocks);
1709 BUG_ON((j + last_slot) >= reg->hr_blocks);
1711 slot = ®->hr_slots[j + last_slot];
1712 slot->ds_raw_block =
1713 (struct o2hb_disk_heartbeat_block *) raw;
1715 raw += reg->hr_block_bytes;
1722 /* Read in all the slots available and populate the tracking
1723 * structures so that we can start with a baseline idea of what's
1725 static int o2hb_populate_slot_data(struct o2hb_region *reg)
1728 struct o2hb_disk_slot *slot;
1729 struct o2hb_disk_heartbeat_block *hb_block;
1731 ret = o2hb_read_slots(reg, 0, reg->hr_blocks);
1735 /* We only want to get an idea of the values initially in each
1736 * slot, so we do no verification - o2hb_check_slot will
1737 * actually determine if each configured slot is valid and
1738 * whether any values have changed. */
1739 for(i = 0; i < reg->hr_blocks; i++) {
1740 slot = ®->hr_slots[i];
1741 hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block;
1743 /* Only fill the values that o2hb_check_slot uses to
1744 * determine changing slots */
1745 slot->ds_last_time = le64_to_cpu(hb_block->hb_seq);
1746 slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
1753 /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */
1754 static ssize_t o2hb_region_dev_store(struct config_item *item,
1758 struct o2hb_region *reg = to_o2hb_region(item);
1759 struct task_struct *hb_task;
1762 char *p = (char *)page;
1764 ssize_t ret = -EINVAL;
1770 /* We can't heartbeat without having had our node number
1771 * configured yet. */
1772 if (o2nm_this_node() == O2NM_MAX_NODES)
1775 fd = simple_strtol(p, &p, 0);
1776 if (!p || (*p && (*p != '\n')))
1779 if (fd < 0 || fd >= INT_MAX)
1786 if (reg->hr_blocks == 0 || reg->hr_start_block == 0 ||
1787 reg->hr_block_bytes == 0)
1790 if (!S_ISBLK(f.file->f_mapping->host->i_mode))
1793 reg->hr_bdev = blkdev_get_by_dev(f.file->f_mapping->host->i_rdev,
1794 FMODE_WRITE | FMODE_READ, NULL);
1795 if (IS_ERR(reg->hr_bdev)) {
1796 ret = PTR_ERR(reg->hr_bdev);
1797 reg->hr_bdev = NULL;
1801 bdevname(reg->hr_bdev, reg->hr_dev_name);
1803 sectsize = bdev_logical_block_size(reg->hr_bdev);
1804 if (sectsize != reg->hr_block_bytes) {
1806 "blocksize %u incorrect for device, expected %d",
1807 reg->hr_block_bytes, sectsize);
1812 o2hb_init_region_params(reg);
1814 /* Generation of zero is invalid */
1816 get_random_bytes(®->hr_generation,
1817 sizeof(reg->hr_generation));
1818 } while (reg->hr_generation == 0);
1820 ret = o2hb_map_slot_data(reg);
1826 ret = o2hb_populate_slot_data(reg);
1832 INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout);
1833 INIT_DELAYED_WORK(®->hr_nego_timeout_work, o2hb_nego_timeout);
1836 * A node is considered live after it has beat LIVE_THRESHOLD
1837 * times. We're not steady until we've given them a chance
1838 * _after_ our first read.
1839 * The default threshold is bare minimum so as to limit the delay
1840 * during mounts. For global heartbeat, the threshold doubled for the
1843 live_threshold = O2HB_LIVE_THRESHOLD;
1844 if (o2hb_global_heartbeat_active()) {
1845 spin_lock(&o2hb_live_lock);
1846 if (bitmap_weight(o2hb_region_bitmap, O2NM_MAX_REGIONS) == 1)
1847 live_threshold <<= 1;
1848 spin_unlock(&o2hb_live_lock);
1851 atomic_set(®->hr_steady_iterations, live_threshold);
1852 /* unsteady_iterations is triple the steady_iterations */
1853 atomic_set(®->hr_unsteady_iterations, (live_threshold * 3));
1855 hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s",
1856 reg->hr_item.ci_name);
1857 if (IS_ERR(hb_task)) {
1858 ret = PTR_ERR(hb_task);
1863 spin_lock(&o2hb_live_lock);
1864 reg->hr_task = hb_task;
1865 spin_unlock(&o2hb_live_lock);
1867 ret = wait_event_interruptible(o2hb_steady_queue,
1868 atomic_read(®->hr_steady_iterations) == 0 ||
1869 reg->hr_node_deleted);
1871 atomic_set(®->hr_steady_iterations, 0);
1872 reg->hr_aborted_start = 1;
1875 if (reg->hr_aborted_start) {
1880 if (reg->hr_node_deleted) {
1885 /* Ok, we were woken. Make sure it wasn't by drop_item() */
1886 spin_lock(&o2hb_live_lock);
1887 hb_task = reg->hr_task;
1888 if (o2hb_global_heartbeat_active())
1889 set_bit(reg->hr_region_num, o2hb_live_region_bitmap);
1890 spin_unlock(&o2hb_live_lock);
1897 if (hb_task && o2hb_global_heartbeat_active())
1898 printk(KERN_NOTICE "o2hb: Heartbeat started on region %s (%s)\n",
1899 config_item_name(®->hr_item), reg->hr_dev_name);
1903 blkdev_put(reg->hr_bdev, FMODE_READ | FMODE_WRITE);
1904 reg->hr_bdev = NULL;
1912 static ssize_t o2hb_region_pid_show(struct config_item *item, char *page)
1914 struct o2hb_region *reg = to_o2hb_region(item);
1917 spin_lock(&o2hb_live_lock);
1919 pid = task_pid_nr(reg->hr_task);
1920 spin_unlock(&o2hb_live_lock);
1925 return sprintf(page, "%u\n", pid);
1928 CONFIGFS_ATTR(o2hb_region_, block_bytes);
1929 CONFIGFS_ATTR(o2hb_region_, start_block);
1930 CONFIGFS_ATTR(o2hb_region_, blocks);
1931 CONFIGFS_ATTR(o2hb_region_, dev);
1932 CONFIGFS_ATTR_RO(o2hb_region_, pid);
1934 static struct configfs_attribute *o2hb_region_attrs[] = {
1935 &o2hb_region_attr_block_bytes,
1936 &o2hb_region_attr_start_block,
1937 &o2hb_region_attr_blocks,
1938 &o2hb_region_attr_dev,
1939 &o2hb_region_attr_pid,
1943 static struct configfs_item_operations o2hb_region_item_ops = {
1944 .release = o2hb_region_release,
1947 static const struct config_item_type o2hb_region_type = {
1948 .ct_item_ops = &o2hb_region_item_ops,
1949 .ct_attrs = o2hb_region_attrs,
1950 .ct_owner = THIS_MODULE,
1955 struct o2hb_heartbeat_group {
1956 struct config_group hs_group;
1960 static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group)
1963 container_of(group, struct o2hb_heartbeat_group, hs_group)
1967 static void o2hb_debug_region_init(struct o2hb_region *reg,
1968 struct dentry *parent)
1972 dir = debugfs_create_dir(config_item_name(®->hr_item), parent);
1973 reg->hr_debug_dir = dir;
1975 o2hb_debug_create(O2HB_DEBUG_LIVENODES, dir, &(reg->hr_db_livenodes),
1976 sizeof(*(reg->hr_db_livenodes)),
1977 O2HB_DB_TYPE_REGION_LIVENODES,
1978 sizeof(reg->hr_live_node_bitmap), O2NM_MAX_NODES,
1981 o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER, dir, &(reg->hr_db_regnum),
1982 sizeof(*(reg->hr_db_regnum)),
1983 O2HB_DB_TYPE_REGION_NUMBER, 0, O2NM_MAX_NODES, reg);
1985 o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME, dir,
1986 &(reg->hr_db_elapsed_time),
1987 sizeof(*(reg->hr_db_elapsed_time)),
1988 O2HB_DB_TYPE_REGION_ELAPSED_TIME, 0, 0, reg);
1990 o2hb_debug_create(O2HB_DEBUG_REGION_PINNED, dir, &(reg->hr_db_pinned),
1991 sizeof(*(reg->hr_db_pinned)),
1992 O2HB_DB_TYPE_REGION_PINNED, 0, 0, reg);
1996 static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group,
1999 struct o2hb_region *reg = NULL;
2002 reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL);
2004 return ERR_PTR(-ENOMEM);
2006 if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) {
2007 ret = -ENAMETOOLONG;
2011 spin_lock(&o2hb_live_lock);
2012 reg->hr_region_num = 0;
2013 if (o2hb_global_heartbeat_active()) {
2014 reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap,
2016 if (reg->hr_region_num >= O2NM_MAX_REGIONS) {
2017 spin_unlock(&o2hb_live_lock);
2021 set_bit(reg->hr_region_num, o2hb_region_bitmap);
2023 list_add_tail(®->hr_all_item, &o2hb_all_regions);
2024 spin_unlock(&o2hb_live_lock);
2026 config_item_init_type_name(®->hr_item, name, &o2hb_region_type);
2028 /* this is the same way to generate msg key as dlm, for local heartbeat,
2029 * name is also the same, so make initial crc value different to avoid
2030 * message key conflict.
2032 reg->hr_key = crc32_le(reg->hr_region_num + O2NM_MAX_REGIONS,
2033 name, strlen(name));
2034 INIT_LIST_HEAD(®->hr_handler_list);
2035 ret = o2net_register_handler(O2HB_NEGO_TIMEOUT_MSG, reg->hr_key,
2036 sizeof(struct o2hb_nego_msg),
2037 o2hb_nego_timeout_handler,
2038 reg, NULL, ®->hr_handler_list);
2042 ret = o2net_register_handler(O2HB_NEGO_APPROVE_MSG, reg->hr_key,
2043 sizeof(struct o2hb_nego_msg),
2044 o2hb_nego_approve_handler,
2045 reg, NULL, ®->hr_handler_list);
2047 goto unregister_handler;
2049 o2hb_debug_region_init(reg, o2hb_debug_dir);
2051 return ®->hr_item;
2054 o2net_unregister_handler_list(®->hr_handler_list);
2056 spin_lock(&o2hb_live_lock);
2057 list_del(®->hr_all_item);
2058 if (o2hb_global_heartbeat_active())
2059 clear_bit(reg->hr_region_num, o2hb_region_bitmap);
2060 spin_unlock(&o2hb_live_lock);
2063 return ERR_PTR(ret);
2066 static void o2hb_heartbeat_group_drop_item(struct config_group *group,
2067 struct config_item *item)
2069 struct task_struct *hb_task;
2070 struct o2hb_region *reg = to_o2hb_region(item);
2071 int quorum_region = 0;
2073 /* stop the thread when the user removes the region dir */
2074 spin_lock(&o2hb_live_lock);
2075 hb_task = reg->hr_task;
2076 reg->hr_task = NULL;
2077 reg->hr_item_dropped = 1;
2078 spin_unlock(&o2hb_live_lock);
2081 kthread_stop(hb_task);
2083 if (o2hb_global_heartbeat_active()) {
2084 spin_lock(&o2hb_live_lock);
2085 clear_bit(reg->hr_region_num, o2hb_region_bitmap);
2086 clear_bit(reg->hr_region_num, o2hb_live_region_bitmap);
2087 if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
2089 clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
2090 spin_unlock(&o2hb_live_lock);
2091 printk(KERN_NOTICE "o2hb: Heartbeat %s on region %s (%s)\n",
2092 ((atomic_read(®->hr_steady_iterations) == 0) ?
2093 "stopped" : "start aborted"), config_item_name(item),
2098 * If we're racing a dev_write(), we need to wake them. They will
2099 * check reg->hr_task
2101 if (atomic_read(®->hr_steady_iterations) != 0) {
2102 reg->hr_aborted_start = 1;
2103 atomic_set(®->hr_steady_iterations, 0);
2104 wake_up(&o2hb_steady_queue);
2107 config_item_put(item);
2109 if (!o2hb_global_heartbeat_active() || !quorum_region)
2113 * If global heartbeat active and there are dependent users,
2114 * pin all regions if quorum region count <= CUT_OFF
2116 spin_lock(&o2hb_live_lock);
2118 if (!o2hb_dependent_users)
2121 if (bitmap_weight(o2hb_quorum_region_bitmap,
2122 O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
2123 o2hb_region_pin(NULL);
2126 spin_unlock(&o2hb_live_lock);
2129 static ssize_t o2hb_heartbeat_group_dead_threshold_show(struct config_item *item,
2132 return sprintf(page, "%u\n", o2hb_dead_threshold);
2135 static ssize_t o2hb_heartbeat_group_dead_threshold_store(struct config_item *item,
2136 const char *page, size_t count)
2139 char *p = (char *)page;
2141 tmp = simple_strtoul(p, &p, 10);
2142 if (!p || (*p && (*p != '\n')))
2145 /* this will validate ranges for us. */
2146 o2hb_dead_threshold_set((unsigned int) tmp);
2151 static ssize_t o2hb_heartbeat_group_mode_show(struct config_item *item,
2154 return sprintf(page, "%s\n",
2155 o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]);
2158 static ssize_t o2hb_heartbeat_group_mode_store(struct config_item *item,
2159 const char *page, size_t count)
2165 len = (page[count - 1] == '\n') ? count - 1 : count;
2169 for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) {
2170 if (strncasecmp(page, o2hb_heartbeat_mode_desc[i], len))
2173 ret = o2hb_global_heartbeat_mode_set(i);
2175 printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n",
2176 o2hb_heartbeat_mode_desc[i]);
2184 CONFIGFS_ATTR(o2hb_heartbeat_group_, dead_threshold);
2185 CONFIGFS_ATTR(o2hb_heartbeat_group_, mode);
2187 static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = {
2188 &o2hb_heartbeat_group_attr_dead_threshold,
2189 &o2hb_heartbeat_group_attr_mode,
2193 static struct configfs_group_operations o2hb_heartbeat_group_group_ops = {
2194 .make_item = o2hb_heartbeat_group_make_item,
2195 .drop_item = o2hb_heartbeat_group_drop_item,
2198 static const struct config_item_type o2hb_heartbeat_group_type = {
2199 .ct_group_ops = &o2hb_heartbeat_group_group_ops,
2200 .ct_attrs = o2hb_heartbeat_group_attrs,
2201 .ct_owner = THIS_MODULE,
2204 /* this is just here to avoid touching group in heartbeat.h which the
2205 * entire damn world #includes */
2206 struct config_group *o2hb_alloc_hb_set(void)
2208 struct o2hb_heartbeat_group *hs = NULL;
2209 struct config_group *ret = NULL;
2211 hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL);
2215 config_group_init_type_name(&hs->hs_group, "heartbeat",
2216 &o2hb_heartbeat_group_type);
2218 ret = &hs->hs_group;
2225 void o2hb_free_hb_set(struct config_group *group)
2227 struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group);
2231 /* hb callback registration and issuing */
2233 static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type)
2235 if (type == O2HB_NUM_CB)
2236 return ERR_PTR(-EINVAL);
2238 return &o2hb_callbacks[type];
2241 void o2hb_setup_callback(struct o2hb_callback_func *hc,
2242 enum o2hb_callback_type type,
2247 INIT_LIST_HEAD(&hc->hc_item);
2250 hc->hc_priority = priority;
2252 hc->hc_magic = O2HB_CB_MAGIC;
2254 EXPORT_SYMBOL_GPL(o2hb_setup_callback);
2257 * In local heartbeat mode, region_uuid passed matches the dlm domain name.
2258 * In global heartbeat mode, region_uuid passed is NULL.
2260 * In local, we only pin the matching region. In global we pin all the active
2263 static int o2hb_region_pin(const char *region_uuid)
2265 int ret = 0, found = 0;
2266 struct o2hb_region *reg;
2269 assert_spin_locked(&o2hb_live_lock);
2271 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2272 if (reg->hr_item_dropped)
2275 uuid = config_item_name(®->hr_item);
2277 /* local heartbeat */
2279 if (strcmp(region_uuid, uuid))
2284 if (reg->hr_item_pinned || reg->hr_item_dropped)
2287 /* Ignore ENOENT only for local hb (userdlm domain) */
2288 ret = o2nm_depend_item(®->hr_item);
2290 mlog(ML_CLUSTER, "Pin region %s\n", uuid);
2291 reg->hr_item_pinned = 1;
2293 if (ret == -ENOENT && found)
2296 mlog(ML_ERROR, "Pin region %s fails with %d\n",
2310 * In local heartbeat mode, region_uuid passed matches the dlm domain name.
2311 * In global heartbeat mode, region_uuid passed is NULL.
2313 * In local, we only unpin the matching region. In global we unpin all the
2316 static void o2hb_region_unpin(const char *region_uuid)
2318 struct o2hb_region *reg;
2322 assert_spin_locked(&o2hb_live_lock);
2324 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2325 if (reg->hr_item_dropped)
2328 uuid = config_item_name(®->hr_item);
2330 if (strcmp(region_uuid, uuid))
2335 if (reg->hr_item_pinned) {
2336 mlog(ML_CLUSTER, "Unpin region %s\n", uuid);
2337 o2nm_undepend_item(®->hr_item);
2338 reg->hr_item_pinned = 0;
2345 static int o2hb_region_inc_user(const char *region_uuid)
2349 spin_lock(&o2hb_live_lock);
2351 /* local heartbeat */
2352 if (!o2hb_global_heartbeat_active()) {
2353 ret = o2hb_region_pin(region_uuid);
2358 * if global heartbeat active and this is the first dependent user,
2359 * pin all regions if quorum region count <= CUT_OFF
2361 o2hb_dependent_users++;
2362 if (o2hb_dependent_users > 1)
2365 if (bitmap_weight(o2hb_quorum_region_bitmap,
2366 O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
2367 ret = o2hb_region_pin(NULL);
2370 spin_unlock(&o2hb_live_lock);
2374 static void o2hb_region_dec_user(const char *region_uuid)
2376 spin_lock(&o2hb_live_lock);
2378 /* local heartbeat */
2379 if (!o2hb_global_heartbeat_active()) {
2380 o2hb_region_unpin(region_uuid);
2385 * if global heartbeat active and there are no dependent users,
2386 * unpin all quorum regions
2388 o2hb_dependent_users--;
2389 if (!o2hb_dependent_users)
2390 o2hb_region_unpin(NULL);
2393 spin_unlock(&o2hb_live_lock);
2396 int o2hb_register_callback(const char *region_uuid,
2397 struct o2hb_callback_func *hc)
2399 struct o2hb_callback_func *f;
2400 struct o2hb_callback *hbcall;
2403 BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
2404 BUG_ON(!list_empty(&hc->hc_item));
2406 hbcall = hbcall_from_type(hc->hc_type);
2407 if (IS_ERR(hbcall)) {
2408 ret = PTR_ERR(hbcall);
2413 ret = o2hb_region_inc_user(region_uuid);
2420 down_write(&o2hb_callback_sem);
2422 list_for_each_entry(f, &hbcall->list, hc_item) {
2423 if (hc->hc_priority < f->hc_priority) {
2424 list_add_tail(&hc->hc_item, &f->hc_item);
2428 if (list_empty(&hc->hc_item))
2429 list_add_tail(&hc->hc_item, &hbcall->list);
2431 up_write(&o2hb_callback_sem);
2434 mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n",
2435 ret, __builtin_return_address(0), hc);
2438 EXPORT_SYMBOL_GPL(o2hb_register_callback);
2440 void o2hb_unregister_callback(const char *region_uuid,
2441 struct o2hb_callback_func *hc)
2443 BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
2445 mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n",
2446 __builtin_return_address(0), hc);
2448 /* XXX Can this happen _with_ a region reference? */
2449 if (list_empty(&hc->hc_item))
2453 o2hb_region_dec_user(region_uuid);
2455 down_write(&o2hb_callback_sem);
2457 list_del_init(&hc->hc_item);
2459 up_write(&o2hb_callback_sem);
2461 EXPORT_SYMBOL_GPL(o2hb_unregister_callback);
2463 int o2hb_check_node_heartbeating_no_sem(u8 node_num)
2465 unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
2467 spin_lock(&o2hb_live_lock);
2468 o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map));
2469 spin_unlock(&o2hb_live_lock);
2470 if (!test_bit(node_num, testing_map)) {
2472 "node (%u) does not have heartbeating enabled.\n",
2479 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_no_sem);
2481 int o2hb_check_node_heartbeating_from_callback(u8 node_num)
2483 unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
2485 o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map));
2486 if (!test_bit(node_num, testing_map)) {
2488 "node (%u) does not have heartbeating enabled.\n",
2495 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback);
2498 * this is just a hack until we get the plumbing which flips file systems
2499 * read only and drops the hb ref instead of killing the node dead.
2501 void o2hb_stop_all_regions(void)
2503 struct o2hb_region *reg;
2505 mlog(ML_ERROR, "stopping heartbeat on all active regions.\n");
2507 spin_lock(&o2hb_live_lock);
2509 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item)
2510 reg->hr_unclean_stop = 1;
2512 spin_unlock(&o2hb_live_lock);
2514 EXPORT_SYMBOL_GPL(o2hb_stop_all_regions);
2516 int o2hb_get_all_regions(char *region_uuids, u8 max_regions)
2518 struct o2hb_region *reg;
2522 spin_lock(&o2hb_live_lock);
2525 list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2526 if (reg->hr_item_dropped)
2529 mlog(0, "Region: %s\n", config_item_name(®->hr_item));
2530 if (numregs < max_regions) {
2531 memcpy(p, config_item_name(®->hr_item),
2532 O2HB_MAX_REGION_NAME_LEN);
2533 p += O2HB_MAX_REGION_NAME_LEN;
2538 spin_unlock(&o2hb_live_lock);
2542 EXPORT_SYMBOL_GPL(o2hb_get_all_regions);
2544 int o2hb_global_heartbeat_active(void)
2546 return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL);
2548 EXPORT_SYMBOL(o2hb_global_heartbeat_active);