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,
223
/* protected by the hr_callback_sem */
224
struct task_struct *hr_task;
226
unsigned int hr_blocks;
227
unsigned long long hr_start_block;
229
unsigned int hr_block_bits;
230
unsigned int hr_block_bytes;
232
unsigned int hr_slots_per_page;
233
unsigned int hr_num_pages;
235
struct page **hr_slot_data;
236
struct block_device *hr_bdev;
237
struct o2hb_disk_slot *hr_slots;
239
/* live node map of this region */
240
unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
241
unsigned int hr_region_num;
243
struct dentry *hr_debug_dir;
244
struct dentry *hr_debug_livenodes;
245
struct dentry *hr_debug_regnum;
246
struct dentry *hr_debug_elapsed_time;
247
struct dentry *hr_debug_pinned;
248
struct o2hb_debug_buf *hr_db_livenodes;
249
struct o2hb_debug_buf *hr_db_regnum;
250
struct o2hb_debug_buf *hr_db_elapsed_time;
251
struct o2hb_debug_buf *hr_db_pinned;
253
/* let the person setting up hb wait for it to return until it
254
* has reached a 'steady' state. This will be fixed when we have
255
* a more complete api that doesn't lead to this sort of fragility. */
256
atomic_t hr_steady_iterations;
258
/* terminate o2hb thread if it does not reach steady state
259
* (hr_steady_iterations == 0) within hr_unsteady_iterations */
260
atomic_t hr_unsteady_iterations;
262
char hr_dev_name[BDEVNAME_SIZE];
264
unsigned int hr_timeout_ms;
266
/* randomized as the region goes up and down so that a node
267
* recognizes a node going up and down in one iteration */
270
struct delayed_work hr_write_timeout_work;
271
unsigned long hr_last_timeout_start;
273
/* Used during o2hb_check_slot to hold a copy of the block
274
* being checked because we temporarily have to zero out the
276
struct o2hb_disk_heartbeat_block *hr_tmp_block;
279
struct o2hb_bio_wait_ctxt {
280
atomic_t wc_num_reqs;
281
struct completion wc_io_complete;
285
static int o2hb_pop_count(void *map, int count)
289
while ((i = find_next_bit(map, count, i + 1)) < count)
294
static void o2hb_write_timeout(struct work_struct *work)
298
struct o2hb_region *reg =
299
container_of(work, struct o2hb_region,
300
hr_write_timeout_work.work);
302
mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u "
303
"milliseconds\n", reg->hr_dev_name,
304
jiffies_to_msecs(jiffies - reg->hr_last_timeout_start));
306
if (o2hb_global_heartbeat_active()) {
307
spin_lock_irqsave(&o2hb_live_lock, flags);
308
if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
309
set_bit(reg->hr_region_num, o2hb_failed_region_bitmap);
310
failed = o2hb_pop_count(&o2hb_failed_region_bitmap,
312
quorum = o2hb_pop_count(&o2hb_quorum_region_bitmap,
314
spin_unlock_irqrestore(&o2hb_live_lock, flags);
316
mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n",
320
* Fence if the number of failed regions >= half the number
323
if ((failed << 1) < quorum)
327
o2quo_disk_timeout();
330
static void o2hb_arm_write_timeout(struct o2hb_region *reg)
332
/* Arm writeout only after thread reaches steady state */
333
if (atomic_read(®->hr_steady_iterations) != 0)
336
mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n",
337
O2HB_MAX_WRITE_TIMEOUT_MS);
339
if (o2hb_global_heartbeat_active()) {
340
spin_lock(&o2hb_live_lock);
341
clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap);
342
spin_unlock(&o2hb_live_lock);
344
cancel_delayed_work(®->hr_write_timeout_work);
345
reg->hr_last_timeout_start = jiffies;
346
schedule_delayed_work(®->hr_write_timeout_work,
347
msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS));
350
static void o2hb_disarm_write_timeout(struct o2hb_region *reg)
352
cancel_delayed_work_sync(®->hr_write_timeout_work);
355
static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc)
357
atomic_set(&wc->wc_num_reqs, 1);
358
init_completion(&wc->wc_io_complete);
362
/* Used in error paths too */
363
static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc,
366
/* sadly atomic_sub_and_test() isn't available on all platforms. The
367
* good news is that the fast path only completes one at a time */
369
if (atomic_dec_and_test(&wc->wc_num_reqs)) {
371
complete(&wc->wc_io_complete);
376
static void o2hb_wait_on_io(struct o2hb_region *reg,
377
struct o2hb_bio_wait_ctxt *wc)
379
o2hb_bio_wait_dec(wc, 1);
380
wait_for_completion(&wc->wc_io_complete);
383
static void o2hb_bio_end_io(struct bio *bio,
386
struct o2hb_bio_wait_ctxt *wc = bio->bi_private;
389
mlog(ML_ERROR, "IO Error %d\n", error);
390
wc->wc_error = error;
393
o2hb_bio_wait_dec(wc, 1);
397
/* Setup a Bio to cover I/O against num_slots slots starting at
399
static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg,
400
struct o2hb_bio_wait_ctxt *wc,
401
unsigned int *current_slot,
402
unsigned int max_slots)
404
int len, current_page;
405
unsigned int vec_len, vec_start;
406
unsigned int bits = reg->hr_block_bits;
407
unsigned int spp = reg->hr_slots_per_page;
408
unsigned int cs = *current_slot;
412
/* Testing has shown this allocation to take long enough under
413
* GFP_KERNEL that the local node can get fenced. It would be
414
* nicest if we could pre-allocate these bios and avoid this
416
bio = bio_alloc(GFP_ATOMIC, 16);
418
mlog(ML_ERROR, "Could not alloc slots BIO!\n");
419
bio = ERR_PTR(-ENOMEM);
423
/* Must put everything in 512 byte sectors for the bio... */
424
bio->bi_sector = (reg->hr_start_block + cs) << (bits - 9);
425
bio->bi_bdev = reg->hr_bdev;
426
bio->bi_private = wc;
427
bio->bi_end_io = o2hb_bio_end_io;
429
vec_start = (cs << bits) % PAGE_CACHE_SIZE;
430
while(cs < max_slots) {
431
current_page = cs / spp;
432
page = reg->hr_slot_data[current_page];
434
vec_len = min(PAGE_CACHE_SIZE - vec_start,
435
(max_slots-cs) * (PAGE_CACHE_SIZE/spp) );
437
mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n",
438
current_page, vec_len, vec_start);
440
len = bio_add_page(bio, page, vec_len, vec_start);
441
if (len != vec_len) break;
443
cs += vec_len / (PAGE_CACHE_SIZE/spp);
452
static int o2hb_read_slots(struct o2hb_region *reg,
453
unsigned int max_slots)
455
unsigned int current_slot=0;
457
struct o2hb_bio_wait_ctxt wc;
460
o2hb_bio_wait_init(&wc);
462
while(current_slot < max_slots) {
463
bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots);
465
status = PTR_ERR(bio);
470
atomic_inc(&wc.wc_num_reqs);
471
submit_bio(READ, bio);
477
o2hb_wait_on_io(reg, &wc);
478
if (wc.wc_error && !status)
479
status = wc.wc_error;
484
static int o2hb_issue_node_write(struct o2hb_region *reg,
485
struct o2hb_bio_wait_ctxt *write_wc)
491
o2hb_bio_wait_init(write_wc);
493
slot = o2nm_this_node();
495
bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1);
497
status = PTR_ERR(bio);
502
atomic_inc(&write_wc->wc_num_reqs);
503
submit_bio(WRITE, bio);
510
static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg,
511
struct o2hb_disk_heartbeat_block *hb_block)
516
/* We want to compute the block crc with a 0 value in the
517
* hb_cksum field. Save it off here and replace after the
519
old_cksum = hb_block->hb_cksum;
520
hb_block->hb_cksum = 0;
522
ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes);
524
hb_block->hb_cksum = old_cksum;
529
static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block)
531
mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, "
532
"cksum = 0x%x, generation 0x%llx\n",
533
(long long)le64_to_cpu(hb_block->hb_seq),
534
hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum),
535
(long long)le64_to_cpu(hb_block->hb_generation));
538
static int o2hb_verify_crc(struct o2hb_region *reg,
539
struct o2hb_disk_heartbeat_block *hb_block)
543
read = le32_to_cpu(hb_block->hb_cksum);
544
computed = o2hb_compute_block_crc_le(reg, hb_block);
546
return read == computed;
550
* Compare the slot data with what we wrote in the last iteration.
551
* If the match fails, print an appropriate error message. This is to
552
* detect errors like... another node hearting on the same slot,
553
* flaky device that is losing writes, etc.
554
* Returns 1 if check succeeds, 0 otherwise.
556
static int o2hb_check_own_slot(struct o2hb_region *reg)
558
struct o2hb_disk_slot *slot;
559
struct o2hb_disk_heartbeat_block *hb_block;
562
slot = ®->hr_slots[o2nm_this_node()];
563
/* Don't check on our 1st timestamp */
564
if (!slot->ds_last_time)
567
hb_block = slot->ds_raw_block;
568
if (le64_to_cpu(hb_block->hb_seq) == slot->ds_last_time &&
569
le64_to_cpu(hb_block->hb_generation) == slot->ds_last_generation &&
570
hb_block->hb_node == slot->ds_node_num)
573
#define ERRSTR1 "Another node is heartbeating on device"
574
#define ERRSTR2 "Heartbeat generation mismatch on device"
575
#define ERRSTR3 "Heartbeat sequence mismatch on device"
577
if (hb_block->hb_node != slot->ds_node_num)
579
else if (le64_to_cpu(hb_block->hb_generation) !=
580
slot->ds_last_generation)
585
mlog(ML_ERROR, "%s (%s): expected(%u:0x%llx, 0x%llx), "
586
"ondisk(%u:0x%llx, 0x%llx)\n", errstr, reg->hr_dev_name,
587
slot->ds_node_num, (unsigned long long)slot->ds_last_generation,
588
(unsigned long long)slot->ds_last_time, hb_block->hb_node,
589
(unsigned long long)le64_to_cpu(hb_block->hb_generation),
590
(unsigned long long)le64_to_cpu(hb_block->hb_seq));
595
static inline void o2hb_prepare_block(struct o2hb_region *reg,
600
struct o2hb_disk_slot *slot;
601
struct o2hb_disk_heartbeat_block *hb_block;
603
node_num = o2nm_this_node();
604
slot = ®->hr_slots[node_num];
606
hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block;
607
memset(hb_block, 0, reg->hr_block_bytes);
608
/* TODO: time stuff */
609
cputime = CURRENT_TIME.tv_sec;
613
hb_block->hb_seq = cpu_to_le64(cputime);
614
hb_block->hb_node = node_num;
615
hb_block->hb_generation = cpu_to_le64(generation);
616
hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS);
618
/* This step must always happen last! */
619
hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg,
622
mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n",
623
(long long)generation,
624
le32_to_cpu(hb_block->hb_cksum));
627
static void o2hb_fire_callbacks(struct o2hb_callback *hbcall,
628
struct o2nm_node *node,
631
struct list_head *iter;
632
struct o2hb_callback_func *f;
634
list_for_each(iter, &hbcall->list) {
635
f = list_entry(iter, struct o2hb_callback_func, hc_item);
636
mlog(ML_HEARTBEAT, "calling funcs %p\n", f);
637
(f->hc_func)(node, idx, f->hc_data);
641
/* Will run the list in order until we process the passed event */
642
static void o2hb_run_event_list(struct o2hb_node_event *queued_event)
645
struct o2hb_callback *hbcall;
646
struct o2hb_node_event *event;
648
spin_lock(&o2hb_live_lock);
649
empty = list_empty(&queued_event->hn_item);
650
spin_unlock(&o2hb_live_lock);
654
/* Holding callback sem assures we don't alter the callback
655
* lists when doing this, and serializes ourselves with other
656
* processes wanting callbacks. */
657
down_write(&o2hb_callback_sem);
659
spin_lock(&o2hb_live_lock);
660
while (!list_empty(&o2hb_node_events)
661
&& !list_empty(&queued_event->hn_item)) {
662
event = list_entry(o2hb_node_events.next,
663
struct o2hb_node_event,
665
list_del_init(&event->hn_item);
666
spin_unlock(&o2hb_live_lock);
668
mlog(ML_HEARTBEAT, "Node %s event for %d\n",
669
event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN",
672
hbcall = hbcall_from_type(event->hn_event_type);
674
/* We should *never* have gotten on to the list with a
675
* bad type... This isn't something that we should try
676
* to recover from. */
677
BUG_ON(IS_ERR(hbcall));
679
o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num);
681
spin_lock(&o2hb_live_lock);
683
spin_unlock(&o2hb_live_lock);
685
up_write(&o2hb_callback_sem);
688
static void o2hb_queue_node_event(struct o2hb_node_event *event,
689
enum o2hb_callback_type type,
690
struct o2nm_node *node,
693
assert_spin_locked(&o2hb_live_lock);
695
BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB));
697
event->hn_event_type = type;
698
event->hn_node = node;
699
event->hn_node_num = node_num;
701
mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n",
702
type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num);
704
list_add_tail(&event->hn_item, &o2hb_node_events);
707
static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot)
709
struct o2hb_node_event event =
710
{ .hn_item = LIST_HEAD_INIT(event.hn_item), };
711
struct o2nm_node *node;
713
node = o2nm_get_node_by_num(slot->ds_node_num);
717
spin_lock(&o2hb_live_lock);
718
if (!list_empty(&slot->ds_live_item)) {
719
mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n",
722
list_del_init(&slot->ds_live_item);
724
if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
725
clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
727
o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node,
731
spin_unlock(&o2hb_live_lock);
733
o2hb_run_event_list(&event);
738
static void o2hb_set_quorum_device(struct o2hb_region *reg)
740
if (!o2hb_global_heartbeat_active())
743
/* Prevent race with o2hb_heartbeat_group_drop_item() */
744
if (kthread_should_stop())
747
/* Tag region as quorum only after thread reaches steady state */
748
if (atomic_read(®->hr_steady_iterations) != 0)
751
spin_lock(&o2hb_live_lock);
753
if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
757
* A region can be added to the quorum only when it sees all
758
* live nodes heartbeat on it. In other words, the region has been
759
* added to all nodes.
761
if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap,
762
sizeof(o2hb_live_node_bitmap)))
765
printk(KERN_NOTICE "o2hb: Region %s (%s) is now a quorum device\n",
766
config_item_name(®->hr_item), reg->hr_dev_name);
768
set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
771
* If global heartbeat active, unpin all regions if the
772
* region count > CUT_OFF
774
if (o2hb_pop_count(&o2hb_quorum_region_bitmap,
775
O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF)
776
o2hb_region_unpin(NULL);
778
spin_unlock(&o2hb_live_lock);
781
static int o2hb_check_slot(struct o2hb_region *reg,
782
struct o2hb_disk_slot *slot)
784
int changed = 0, gen_changed = 0;
785
struct o2hb_node_event event =
786
{ .hn_item = LIST_HEAD_INIT(event.hn_item), };
787
struct o2nm_node *node;
788
struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block;
790
unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS;
791
unsigned int slot_dead_ms;
794
memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes);
797
* If a node is no longer configured but is still in the livemap, we
798
* may need to clear that bit from the livemap.
800
node = o2nm_get_node_by_num(slot->ds_node_num);
802
spin_lock(&o2hb_live_lock);
803
tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap);
804
spin_unlock(&o2hb_live_lock);
809
if (!o2hb_verify_crc(reg, hb_block)) {
810
/* all paths from here will drop o2hb_live_lock for
812
spin_lock(&o2hb_live_lock);
814
/* Don't print an error on the console in this case -
815
* a freshly formatted heartbeat area will not have a
817
if (list_empty(&slot->ds_live_item))
820
/* The node is live but pushed out a bad crc. We
821
* consider it a transient miss but don't populate any
822
* other values as they may be junk. */
823
mlog(ML_ERROR, "Node %d has written a bad crc to %s\n",
824
slot->ds_node_num, reg->hr_dev_name);
825
o2hb_dump_slot(hb_block);
827
slot->ds_equal_samples++;
831
/* we don't care if these wrap.. the state transitions below
832
* clear at the right places */
833
cputime = le64_to_cpu(hb_block->hb_seq);
834
if (slot->ds_last_time != cputime)
835
slot->ds_changed_samples++;
837
slot->ds_equal_samples++;
838
slot->ds_last_time = cputime;
840
/* The node changed heartbeat generations. We assume this to
841
* mean it dropped off but came back before we timed out. We
842
* want to consider it down for the time being but don't want
843
* to lose any changed_samples state we might build up to
844
* considering it live again. */
845
if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) {
847
slot->ds_equal_samples = 0;
848
mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx "
849
"to 0x%llx)\n", slot->ds_node_num,
850
(long long)slot->ds_last_generation,
851
(long long)le64_to_cpu(hb_block->hb_generation));
854
slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
856
mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x "
857
"seq %llu last %llu changed %u equal %u\n",
858
slot->ds_node_num, (long long)slot->ds_last_generation,
859
le32_to_cpu(hb_block->hb_cksum),
860
(unsigned long long)le64_to_cpu(hb_block->hb_seq),
861
(unsigned long long)slot->ds_last_time, slot->ds_changed_samples,
862
slot->ds_equal_samples);
864
spin_lock(&o2hb_live_lock);
867
/* dead nodes only come to life after some number of
868
* changes at any time during their dead time */
869
if (list_empty(&slot->ds_live_item) &&
870
slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) {
871
mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n",
872
slot->ds_node_num, (long long)slot->ds_last_generation);
874
set_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
876
/* first on the list generates a callback */
877
if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
878
mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes "
879
"bitmap\n", slot->ds_node_num);
880
set_bit(slot->ds_node_num, o2hb_live_node_bitmap);
882
o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node,
888
list_add_tail(&slot->ds_live_item,
889
&o2hb_live_slots[slot->ds_node_num]);
891
slot->ds_equal_samples = 0;
893
/* We want to be sure that all nodes agree on the
894
* number of milliseconds before a node will be
895
* considered dead. The self-fencing timeout is
896
* computed from this value, and a discrepancy might
897
* result in heartbeat calling a node dead when it
898
* hasn't self-fenced yet. */
899
slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms);
900
if (slot_dead_ms && slot_dead_ms != dead_ms) {
901
/* TODO: Perhaps we can fail the region here. */
902
mlog(ML_ERROR, "Node %d on device %s has a dead count "
903
"of %u ms, but our count is %u ms.\n"
904
"Please double check your configuration values "
905
"for 'O2CB_HEARTBEAT_THRESHOLD'\n",
906
slot->ds_node_num, reg->hr_dev_name, slot_dead_ms,
912
/* if the list is dead, we're done.. */
913
if (list_empty(&slot->ds_live_item))
916
/* live nodes only go dead after enough consequtive missed
917
* samples.. reset the missed counter whenever we see
919
if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) {
920
mlog(ML_HEARTBEAT, "Node %d left my region\n",
923
clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap);
925
/* last off the live_slot generates a callback */
926
list_del_init(&slot->ds_live_item);
927
if (list_empty(&o2hb_live_slots[slot->ds_node_num])) {
928
mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live "
929
"nodes bitmap\n", slot->ds_node_num);
930
clear_bit(slot->ds_node_num, o2hb_live_node_bitmap);
932
/* node can be null */
933
o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB,
934
node, slot->ds_node_num);
939
/* We don't clear this because the node is still
940
* actually writing new blocks. */
942
slot->ds_changed_samples = 0;
945
if (slot->ds_changed_samples) {
946
slot->ds_changed_samples = 0;
947
slot->ds_equal_samples = 0;
950
spin_unlock(&o2hb_live_lock);
952
o2hb_run_event_list(&event);
959
/* This could be faster if we just implmented a find_last_bit, but I
960
* don't think the circumstances warrant it. */
961
static int o2hb_highest_node(unsigned long *nodes,
968
while ((node = find_next_bit(nodes, numbits, node + 1)) != -1) {
978
static int o2hb_do_disk_heartbeat(struct o2hb_region *reg)
980
int i, ret, highest_node;
981
int membership_change = 0, own_slot_ok = 0;
982
unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)];
983
unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
984
struct o2hb_bio_wait_ctxt write_wc;
986
ret = o2nm_configured_node_map(configured_nodes,
987
sizeof(configured_nodes));
994
* If a node is not configured but is in the livemap, we still need
995
* to read the slot so as to be able to remove it from the livemap.
997
o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap));
999
while ((i = find_next_bit(live_node_bitmap,
1000
O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
1001
set_bit(i, configured_nodes);
1004
highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES);
1005
if (highest_node >= O2NM_MAX_NODES) {
1006
mlog(ML_NOTICE, "o2hb: No configured nodes found!\n");
1011
/* No sense in reading the slots of nodes that don't exist
1012
* yet. Of course, if the node definitions have holes in them
1013
* then we're reading an empty slot anyway... Consider this
1015
ret = o2hb_read_slots(reg, highest_node + 1);
1021
/* With an up to date view of the slots, we can check that no
1022
* other node has been improperly configured to heartbeat in
1024
own_slot_ok = o2hb_check_own_slot(reg);
1026
/* fill in the proper info for our next heartbeat */
1027
o2hb_prepare_block(reg, reg->hr_generation);
1029
ret = o2hb_issue_node_write(reg, &write_wc);
1036
while((i = find_next_bit(configured_nodes,
1037
O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) {
1038
membership_change |= o2hb_check_slot(reg, ®->hr_slots[i]);
1042
* We have to be sure we've advertised ourselves on disk
1043
* before we can go to steady state. This ensures that
1044
* people we find in our steady state have seen us.
1046
o2hb_wait_on_io(reg, &write_wc);
1047
if (write_wc.wc_error) {
1048
/* Do not re-arm the write timeout on I/O error - we
1049
* can't be sure that the new block ever made it to
1051
mlog(ML_ERROR, "Write error %d on device \"%s\"\n",
1052
write_wc.wc_error, reg->hr_dev_name);
1053
ret = write_wc.wc_error;
1057
/* Skip disarming the timeout if own slot has stale/bad data */
1059
o2hb_set_quorum_device(reg);
1060
o2hb_arm_write_timeout(reg);
1064
/* let the person who launched us know when things are steady */
1065
if (atomic_read(®->hr_steady_iterations) != 0) {
1066
if (!ret && own_slot_ok && !membership_change) {
1067
if (atomic_dec_and_test(®->hr_steady_iterations))
1068
wake_up(&o2hb_steady_queue);
1072
if (atomic_read(®->hr_steady_iterations) != 0) {
1073
if (atomic_dec_and_test(®->hr_unsteady_iterations)) {
1074
printk(KERN_NOTICE "o2hb: Unable to stabilize "
1075
"heartbeart on region %s (%s)\n",
1076
config_item_name(®->hr_item),
1078
atomic_set(®->hr_steady_iterations, 0);
1079
reg->hr_aborted_start = 1;
1080
wake_up(&o2hb_steady_queue);
1088
/* Subtract b from a, storing the result in a. a *must* have a larger
1090
static void o2hb_tv_subtract(struct timeval *a,
1093
/* just return 0 when a is after b */
1094
if (a->tv_sec < b->tv_sec ||
1095
(a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec)) {
1101
a->tv_sec -= b->tv_sec;
1102
a->tv_usec -= b->tv_usec;
1103
while ( a->tv_usec < 0 ) {
1105
a->tv_usec += 1000000;
1109
static unsigned int o2hb_elapsed_msecs(struct timeval *start,
1110
struct timeval *end)
1112
struct timeval res = *end;
1114
o2hb_tv_subtract(&res, start);
1116
return res.tv_sec * 1000 + res.tv_usec / 1000;
1120
* we ride the region ref that the region dir holds. before the region
1121
* dir is removed and drops it ref it will wait to tear down this
1124
static int o2hb_thread(void *data)
1127
struct o2hb_region *reg = data;
1128
struct o2hb_bio_wait_ctxt write_wc;
1129
struct timeval before_hb, after_hb;
1130
unsigned int elapsed_msec;
1132
mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n");
1134
set_user_nice(current, -20);
1137
o2nm_depend_this_node();
1139
while (!kthread_should_stop() &&
1140
!reg->hr_unclean_stop && !reg->hr_aborted_start) {
1141
/* We track the time spent inside
1142
* o2hb_do_disk_heartbeat so that we avoid more than
1143
* hr_timeout_ms between disk writes. On busy systems
1144
* this should result in a heartbeat which is less
1145
* likely to time itself out. */
1146
do_gettimeofday(&before_hb);
1148
ret = o2hb_do_disk_heartbeat(reg);
1150
do_gettimeofday(&after_hb);
1151
elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb);
1154
"start = %lu.%lu, end = %lu.%lu, msec = %u\n",
1155
before_hb.tv_sec, (unsigned long) before_hb.tv_usec,
1156
after_hb.tv_sec, (unsigned long) after_hb.tv_usec,
1159
if (!kthread_should_stop() &&
1160
elapsed_msec < reg->hr_timeout_ms) {
1161
/* the kthread api has blocked signals for us so no
1162
* need to record the return value. */
1163
msleep_interruptible(reg->hr_timeout_ms - elapsed_msec);
1167
o2hb_disarm_write_timeout(reg);
1169
/* unclean stop is only used in very bad situation */
1170
for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++)
1171
o2hb_shutdown_slot(®->hr_slots[i]);
1173
/* Explicit down notification - avoid forcing the other nodes
1174
* to timeout on this region when we could just as easily
1175
* write a clear generation - thus indicating to them that
1176
* this node has left this region.
1178
if (!reg->hr_unclean_stop && !reg->hr_aborted_start) {
1179
o2hb_prepare_block(reg, 0);
1180
ret = o2hb_issue_node_write(reg, &write_wc);
1182
o2hb_wait_on_io(reg, &write_wc);
1188
o2nm_undepend_this_node();
1190
mlog(ML_HEARTBEAT|ML_KTHREAD, "o2hb thread exiting\n");
1195
#ifdef CONFIG_DEBUG_FS
1196
static int o2hb_debug_open(struct inode *inode, struct file *file)
1198
struct o2hb_debug_buf *db = inode->i_private;
1199
struct o2hb_region *reg;
1200
unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1206
/* max_nodes should be the largest bitmap we pass here */
1207
BUG_ON(sizeof(map) < db->db_size);
1209
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
1213
switch (db->db_type) {
1214
case O2HB_DB_TYPE_LIVENODES:
1215
case O2HB_DB_TYPE_LIVEREGIONS:
1216
case O2HB_DB_TYPE_QUORUMREGIONS:
1217
case O2HB_DB_TYPE_FAILEDREGIONS:
1218
spin_lock(&o2hb_live_lock);
1219
memcpy(map, db->db_data, db->db_size);
1220
spin_unlock(&o2hb_live_lock);
1223
case O2HB_DB_TYPE_REGION_LIVENODES:
1224
spin_lock(&o2hb_live_lock);
1225
reg = (struct o2hb_region *)db->db_data;
1226
memcpy(map, reg->hr_live_node_bitmap, db->db_size);
1227
spin_unlock(&o2hb_live_lock);
1230
case O2HB_DB_TYPE_REGION_NUMBER:
1231
reg = (struct o2hb_region *)db->db_data;
1232
out += snprintf(buf + out, PAGE_SIZE - out, "%d\n",
1233
reg->hr_region_num);
1236
case O2HB_DB_TYPE_REGION_ELAPSED_TIME:
1237
reg = (struct o2hb_region *)db->db_data;
1238
lts = reg->hr_last_timeout_start;
1239
/* If 0, it has never been set before */
1241
lts = jiffies_to_msecs(jiffies - lts);
1242
out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts);
1245
case O2HB_DB_TYPE_REGION_PINNED:
1246
reg = (struct o2hb_region *)db->db_data;
1247
out += snprintf(buf + out, PAGE_SIZE - out, "%u\n",
1248
!!reg->hr_item_pinned);
1255
while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len)
1256
out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i);
1257
out += snprintf(buf + out, PAGE_SIZE - out, "\n");
1260
i_size_write(inode, out);
1262
file->private_data = buf;
1269
static int o2hb_debug_release(struct inode *inode, struct file *file)
1271
kfree(file->private_data);
1275
static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
1276
size_t nbytes, loff_t *ppos)
1278
return simple_read_from_buffer(buf, nbytes, ppos, file->private_data,
1279
i_size_read(file->f_mapping->host));
1282
static int o2hb_debug_open(struct inode *inode, struct file *file)
1286
static int o2hb_debug_release(struct inode *inode, struct file *file)
1290
static ssize_t o2hb_debug_read(struct file *file, char __user *buf,
1291
size_t nbytes, loff_t *ppos)
1295
#endif /* CONFIG_DEBUG_FS */
1297
static const struct file_operations o2hb_debug_fops = {
1298
.open = o2hb_debug_open,
1299
.release = o2hb_debug_release,
1300
.read = o2hb_debug_read,
1301
.llseek = generic_file_llseek,
1304
void o2hb_exit(void)
1306
kfree(o2hb_db_livenodes);
1307
kfree(o2hb_db_liveregions);
1308
kfree(o2hb_db_quorumregions);
1309
kfree(o2hb_db_failedregions);
1310
debugfs_remove(o2hb_debug_failedregions);
1311
debugfs_remove(o2hb_debug_quorumregions);
1312
debugfs_remove(o2hb_debug_liveregions);
1313
debugfs_remove(o2hb_debug_livenodes);
1314
debugfs_remove(o2hb_debug_dir);
1317
static struct dentry *o2hb_debug_create(const char *name, struct dentry *dir,
1318
struct o2hb_debug_buf **db, int db_len,
1319
int type, int size, int len, void *data)
1321
*db = kmalloc(db_len, GFP_KERNEL);
1325
(*db)->db_type = type;
1326
(*db)->db_size = size;
1327
(*db)->db_len = len;
1328
(*db)->db_data = data;
1330
return debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db,
1334
static int o2hb_debug_init(void)
1338
o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL);
1339
if (!o2hb_debug_dir) {
1344
o2hb_debug_livenodes = o2hb_debug_create(O2HB_DEBUG_LIVENODES,
1347
sizeof(*o2hb_db_livenodes),
1348
O2HB_DB_TYPE_LIVENODES,
1349
sizeof(o2hb_live_node_bitmap),
1351
o2hb_live_node_bitmap);
1352
if (!o2hb_debug_livenodes) {
1357
o2hb_debug_liveregions = o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS,
1359
&o2hb_db_liveregions,
1360
sizeof(*o2hb_db_liveregions),
1361
O2HB_DB_TYPE_LIVEREGIONS,
1362
sizeof(o2hb_live_region_bitmap),
1364
o2hb_live_region_bitmap);
1365
if (!o2hb_debug_liveregions) {
1370
o2hb_debug_quorumregions =
1371
o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS,
1373
&o2hb_db_quorumregions,
1374
sizeof(*o2hb_db_quorumregions),
1375
O2HB_DB_TYPE_QUORUMREGIONS,
1376
sizeof(o2hb_quorum_region_bitmap),
1378
o2hb_quorum_region_bitmap);
1379
if (!o2hb_debug_quorumregions) {
1384
o2hb_debug_failedregions =
1385
o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS,
1387
&o2hb_db_failedregions,
1388
sizeof(*o2hb_db_failedregions),
1389
O2HB_DB_TYPE_FAILEDREGIONS,
1390
sizeof(o2hb_failed_region_bitmap),
1392
o2hb_failed_region_bitmap);
1393
if (!o2hb_debug_failedregions) {
1410
for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++)
1411
INIT_LIST_HEAD(&o2hb_callbacks[i].list);
1413
for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++)
1414
INIT_LIST_HEAD(&o2hb_live_slots[i]);
1416
INIT_LIST_HEAD(&o2hb_node_events);
1418
memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap));
1419
memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap));
1420
memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap));
1421
memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap));
1422
memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap));
1424
o2hb_dependent_users = 0;
1426
return o2hb_debug_init();
1429
/* if we're already in a callback then we're already serialized by the sem */
1430
static void o2hb_fill_node_map_from_callback(unsigned long *map,
1433
BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
1435
memcpy(map, &o2hb_live_node_bitmap, bytes);
1439
* get a map of all nodes that are heartbeating in any regions
1441
void o2hb_fill_node_map(unsigned long *map, unsigned bytes)
1443
/* callers want to serialize this map and callbacks so that they
1444
* can trust that they don't miss nodes coming to the party */
1445
down_read(&o2hb_callback_sem);
1446
spin_lock(&o2hb_live_lock);
1447
o2hb_fill_node_map_from_callback(map, bytes);
1448
spin_unlock(&o2hb_live_lock);
1449
up_read(&o2hb_callback_sem);
1451
EXPORT_SYMBOL_GPL(o2hb_fill_node_map);
1454
* heartbeat configfs bits. The heartbeat set is a default set under
1455
* the cluster set in nodemanager.c.
1458
static struct o2hb_region *to_o2hb_region(struct config_item *item)
1460
return item ? container_of(item, struct o2hb_region, hr_item) : NULL;
1463
/* drop_item only drops its ref after killing the thread, nothing should
1464
* be using the region anymore. this has to clean up any state that
1465
* attributes might have built up. */
1466
static void o2hb_region_release(struct config_item *item)
1470
struct o2hb_region *reg = to_o2hb_region(item);
1472
mlog(ML_HEARTBEAT, "hb region release (%s)\n", reg->hr_dev_name);
1474
if (reg->hr_tmp_block)
1475
kfree(reg->hr_tmp_block);
1477
if (reg->hr_slot_data) {
1478
for (i = 0; i < reg->hr_num_pages; i++) {
1479
page = reg->hr_slot_data[i];
1483
kfree(reg->hr_slot_data);
1487
blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
1490
kfree(reg->hr_slots);
1492
kfree(reg->hr_db_regnum);
1493
kfree(reg->hr_db_livenodes);
1494
debugfs_remove(reg->hr_debug_livenodes);
1495
debugfs_remove(reg->hr_debug_regnum);
1496
debugfs_remove(reg->hr_debug_elapsed_time);
1497
debugfs_remove(reg->hr_debug_pinned);
1498
debugfs_remove(reg->hr_debug_dir);
1500
spin_lock(&o2hb_live_lock);
1501
list_del(®->hr_all_item);
1502
spin_unlock(&o2hb_live_lock);
1507
static int o2hb_read_block_input(struct o2hb_region *reg,
1510
unsigned long *ret_bytes,
1511
unsigned int *ret_bits)
1513
unsigned long bytes;
1514
char *p = (char *)page;
1516
bytes = simple_strtoul(p, &p, 0);
1517
if (!p || (*p && (*p != '\n')))
1520
/* Heartbeat and fs min / max block sizes are the same. */
1521
if (bytes > 4096 || bytes < 512)
1523
if (hweight16(bytes) != 1)
1529
*ret_bits = ffs(bytes) - 1;
1534
static ssize_t o2hb_region_block_bytes_read(struct o2hb_region *reg,
1537
return sprintf(page, "%u\n", reg->hr_block_bytes);
1540
static ssize_t o2hb_region_block_bytes_write(struct o2hb_region *reg,
1545
unsigned long block_bytes;
1546
unsigned int block_bits;
1551
status = o2hb_read_block_input(reg, page, count,
1552
&block_bytes, &block_bits);
1556
reg->hr_block_bytes = (unsigned int)block_bytes;
1557
reg->hr_block_bits = block_bits;
1562
static ssize_t o2hb_region_start_block_read(struct o2hb_region *reg,
1565
return sprintf(page, "%llu\n", reg->hr_start_block);
1568
static ssize_t o2hb_region_start_block_write(struct o2hb_region *reg,
1572
unsigned long long tmp;
1573
char *p = (char *)page;
1578
tmp = simple_strtoull(p, &p, 0);
1579
if (!p || (*p && (*p != '\n')))
1582
reg->hr_start_block = tmp;
1587
static ssize_t o2hb_region_blocks_read(struct o2hb_region *reg,
1590
return sprintf(page, "%d\n", reg->hr_blocks);
1593
static ssize_t o2hb_region_blocks_write(struct o2hb_region *reg,
1598
char *p = (char *)page;
1603
tmp = simple_strtoul(p, &p, 0);
1604
if (!p || (*p && (*p != '\n')))
1607
if (tmp > O2NM_MAX_NODES || tmp == 0)
1610
reg->hr_blocks = (unsigned int)tmp;
1615
static ssize_t o2hb_region_dev_read(struct o2hb_region *reg,
1618
unsigned int ret = 0;
1621
ret = sprintf(page, "%s\n", reg->hr_dev_name);
1626
static void o2hb_init_region_params(struct o2hb_region *reg)
1628
reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits;
1629
reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS;
1631
mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n",
1632
reg->hr_start_block, reg->hr_blocks);
1633
mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n",
1634
reg->hr_block_bytes, reg->hr_block_bits);
1635
mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms);
1636
mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold);
1639
static int o2hb_map_slot_data(struct o2hb_region *reg)
1642
unsigned int last_slot;
1643
unsigned int spp = reg->hr_slots_per_page;
1646
struct o2hb_disk_slot *slot;
1648
reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL);
1649
if (reg->hr_tmp_block == NULL) {
1650
mlog_errno(-ENOMEM);
1654
reg->hr_slots = kcalloc(reg->hr_blocks,
1655
sizeof(struct o2hb_disk_slot), GFP_KERNEL);
1656
if (reg->hr_slots == NULL) {
1657
mlog_errno(-ENOMEM);
1661
for(i = 0; i < reg->hr_blocks; i++) {
1662
slot = ®->hr_slots[i];
1663
slot->ds_node_num = i;
1664
INIT_LIST_HEAD(&slot->ds_live_item);
1665
slot->ds_raw_block = NULL;
1668
reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp;
1669
mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks "
1670
"at %u blocks per page\n",
1671
reg->hr_num_pages, reg->hr_blocks, spp);
1673
reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *),
1675
if (!reg->hr_slot_data) {
1676
mlog_errno(-ENOMEM);
1680
for(i = 0; i < reg->hr_num_pages; i++) {
1681
page = alloc_page(GFP_KERNEL);
1683
mlog_errno(-ENOMEM);
1687
reg->hr_slot_data[i] = page;
1689
last_slot = i * spp;
1690
raw = page_address(page);
1692
(j < spp) && ((j + last_slot) < reg->hr_blocks);
1694
BUG_ON((j + last_slot) >= reg->hr_blocks);
1696
slot = ®->hr_slots[j + last_slot];
1697
slot->ds_raw_block =
1698
(struct o2hb_disk_heartbeat_block *) raw;
1700
raw += reg->hr_block_bytes;
1707
/* Read in all the slots available and populate the tracking
1708
* structures so that we can start with a baseline idea of what's
1710
static int o2hb_populate_slot_data(struct o2hb_region *reg)
1713
struct o2hb_disk_slot *slot;
1714
struct o2hb_disk_heartbeat_block *hb_block;
1716
ret = o2hb_read_slots(reg, reg->hr_blocks);
1722
/* We only want to get an idea of the values initially in each
1723
* slot, so we do no verification - o2hb_check_slot will
1724
* actually determine if each configured slot is valid and
1725
* whether any values have changed. */
1726
for(i = 0; i < reg->hr_blocks; i++) {
1727
slot = ®->hr_slots[i];
1728
hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block;
1730
/* Only fill the values that o2hb_check_slot uses to
1731
* determine changing slots */
1732
slot->ds_last_time = le64_to_cpu(hb_block->hb_seq);
1733
slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation);
1740
/* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */
1741
static ssize_t o2hb_region_dev_write(struct o2hb_region *reg,
1745
struct task_struct *hb_task;
1748
char *p = (char *)page;
1749
struct file *filp = NULL;
1750
struct inode *inode = NULL;
1751
ssize_t ret = -EINVAL;
1757
/* We can't heartbeat without having had our node number
1758
* configured yet. */
1759
if (o2nm_this_node() == O2NM_MAX_NODES)
1762
fd = simple_strtol(p, &p, 0);
1763
if (!p || (*p && (*p != '\n')))
1766
if (fd < 0 || fd >= INT_MAX)
1773
if (reg->hr_blocks == 0 || reg->hr_start_block == 0 ||
1774
reg->hr_block_bytes == 0)
1777
inode = igrab(filp->f_mapping->host);
1781
if (!S_ISBLK(inode->i_mode))
1784
reg->hr_bdev = I_BDEV(filp->f_mapping->host);
1785
ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, NULL);
1787
reg->hr_bdev = NULL;
1792
bdevname(reg->hr_bdev, reg->hr_dev_name);
1794
sectsize = bdev_logical_block_size(reg->hr_bdev);
1795
if (sectsize != reg->hr_block_bytes) {
1797
"blocksize %u incorrect for device, expected %d",
1798
reg->hr_block_bytes, sectsize);
1803
o2hb_init_region_params(reg);
1805
/* Generation of zero is invalid */
1807
get_random_bytes(®->hr_generation,
1808
sizeof(reg->hr_generation));
1809
} while (reg->hr_generation == 0);
1811
ret = o2hb_map_slot_data(reg);
1817
ret = o2hb_populate_slot_data(reg);
1823
INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout);
1826
* A node is considered live after it has beat LIVE_THRESHOLD
1827
* times. We're not steady until we've given them a chance
1828
* _after_ our first read.
1829
* The default threshold is bare minimum so as to limit the delay
1830
* during mounts. For global heartbeat, the threshold doubled for the
1833
live_threshold = O2HB_LIVE_THRESHOLD;
1834
if (o2hb_global_heartbeat_active()) {
1835
spin_lock(&o2hb_live_lock);
1836
if (o2hb_pop_count(&o2hb_region_bitmap, O2NM_MAX_REGIONS) == 1)
1837
live_threshold <<= 1;
1838
spin_unlock(&o2hb_live_lock);
1841
atomic_set(®->hr_steady_iterations, live_threshold);
1842
/* unsteady_iterations is double the steady_iterations */
1843
atomic_set(®->hr_unsteady_iterations, (live_threshold << 1));
1845
hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s",
1846
reg->hr_item.ci_name);
1847
if (IS_ERR(hb_task)) {
1848
ret = PTR_ERR(hb_task);
1853
spin_lock(&o2hb_live_lock);
1854
reg->hr_task = hb_task;
1855
spin_unlock(&o2hb_live_lock);
1857
ret = wait_event_interruptible(o2hb_steady_queue,
1858
atomic_read(®->hr_steady_iterations) == 0);
1860
atomic_set(®->hr_steady_iterations, 0);
1861
reg->hr_aborted_start = 1;
1864
if (reg->hr_aborted_start) {
1869
/* Ok, we were woken. Make sure it wasn't by drop_item() */
1870
spin_lock(&o2hb_live_lock);
1871
hb_task = reg->hr_task;
1872
if (o2hb_global_heartbeat_active())
1873
set_bit(reg->hr_region_num, o2hb_live_region_bitmap);
1874
spin_unlock(&o2hb_live_lock);
1881
if (hb_task && o2hb_global_heartbeat_active())
1882
printk(KERN_NOTICE "o2hb: Heartbeat started on region %s (%s)\n",
1883
config_item_name(®->hr_item), reg->hr_dev_name);
1892
blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE);
1893
reg->hr_bdev = NULL;
1899
static ssize_t o2hb_region_pid_read(struct o2hb_region *reg,
1904
spin_lock(&o2hb_live_lock);
1906
pid = task_pid_nr(reg->hr_task);
1907
spin_unlock(&o2hb_live_lock);
1912
return sprintf(page, "%u\n", pid);
1915
struct o2hb_region_attribute {
1916
struct configfs_attribute attr;
1917
ssize_t (*show)(struct o2hb_region *, char *);
1918
ssize_t (*store)(struct o2hb_region *, const char *, size_t);
1921
static struct o2hb_region_attribute o2hb_region_attr_block_bytes = {
1922
.attr = { .ca_owner = THIS_MODULE,
1923
.ca_name = "block_bytes",
1924
.ca_mode = S_IRUGO | S_IWUSR },
1925
.show = o2hb_region_block_bytes_read,
1926
.store = o2hb_region_block_bytes_write,
1929
static struct o2hb_region_attribute o2hb_region_attr_start_block = {
1930
.attr = { .ca_owner = THIS_MODULE,
1931
.ca_name = "start_block",
1932
.ca_mode = S_IRUGO | S_IWUSR },
1933
.show = o2hb_region_start_block_read,
1934
.store = o2hb_region_start_block_write,
1937
static struct o2hb_region_attribute o2hb_region_attr_blocks = {
1938
.attr = { .ca_owner = THIS_MODULE,
1939
.ca_name = "blocks",
1940
.ca_mode = S_IRUGO | S_IWUSR },
1941
.show = o2hb_region_blocks_read,
1942
.store = o2hb_region_blocks_write,
1945
static struct o2hb_region_attribute o2hb_region_attr_dev = {
1946
.attr = { .ca_owner = THIS_MODULE,
1948
.ca_mode = S_IRUGO | S_IWUSR },
1949
.show = o2hb_region_dev_read,
1950
.store = o2hb_region_dev_write,
1953
static struct o2hb_region_attribute o2hb_region_attr_pid = {
1954
.attr = { .ca_owner = THIS_MODULE,
1956
.ca_mode = S_IRUGO | S_IRUSR },
1957
.show = o2hb_region_pid_read,
1960
static struct configfs_attribute *o2hb_region_attrs[] = {
1961
&o2hb_region_attr_block_bytes.attr,
1962
&o2hb_region_attr_start_block.attr,
1963
&o2hb_region_attr_blocks.attr,
1964
&o2hb_region_attr_dev.attr,
1965
&o2hb_region_attr_pid.attr,
1969
static ssize_t o2hb_region_show(struct config_item *item,
1970
struct configfs_attribute *attr,
1973
struct o2hb_region *reg = to_o2hb_region(item);
1974
struct o2hb_region_attribute *o2hb_region_attr =
1975
container_of(attr, struct o2hb_region_attribute, attr);
1978
if (o2hb_region_attr->show)
1979
ret = o2hb_region_attr->show(reg, page);
1983
static ssize_t o2hb_region_store(struct config_item *item,
1984
struct configfs_attribute *attr,
1985
const char *page, size_t count)
1987
struct o2hb_region *reg = to_o2hb_region(item);
1988
struct o2hb_region_attribute *o2hb_region_attr =
1989
container_of(attr, struct o2hb_region_attribute, attr);
1990
ssize_t ret = -EINVAL;
1992
if (o2hb_region_attr->store)
1993
ret = o2hb_region_attr->store(reg, page, count);
1997
static struct configfs_item_operations o2hb_region_item_ops = {
1998
.release = o2hb_region_release,
1999
.show_attribute = o2hb_region_show,
2000
.store_attribute = o2hb_region_store,
2003
static struct config_item_type o2hb_region_type = {
2004
.ct_item_ops = &o2hb_region_item_ops,
2005
.ct_attrs = o2hb_region_attrs,
2006
.ct_owner = THIS_MODULE,
2011
struct o2hb_heartbeat_group {
2012
struct config_group hs_group;
2016
static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group)
2019
container_of(group, struct o2hb_heartbeat_group, hs_group)
2023
static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir)
2028
debugfs_create_dir(config_item_name(®->hr_item), dir);
2029
if (!reg->hr_debug_dir) {
2034
reg->hr_debug_livenodes =
2035
o2hb_debug_create(O2HB_DEBUG_LIVENODES,
2037
&(reg->hr_db_livenodes),
2038
sizeof(*(reg->hr_db_livenodes)),
2039
O2HB_DB_TYPE_REGION_LIVENODES,
2040
sizeof(reg->hr_live_node_bitmap),
2041
O2NM_MAX_NODES, reg);
2042
if (!reg->hr_debug_livenodes) {
2047
reg->hr_debug_regnum =
2048
o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER,
2050
&(reg->hr_db_regnum),
2051
sizeof(*(reg->hr_db_regnum)),
2052
O2HB_DB_TYPE_REGION_NUMBER,
2053
0, O2NM_MAX_NODES, reg);
2054
if (!reg->hr_debug_regnum) {
2059
reg->hr_debug_elapsed_time =
2060
o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME,
2062
&(reg->hr_db_elapsed_time),
2063
sizeof(*(reg->hr_db_elapsed_time)),
2064
O2HB_DB_TYPE_REGION_ELAPSED_TIME,
2066
if (!reg->hr_debug_elapsed_time) {
2071
reg->hr_debug_pinned =
2072
o2hb_debug_create(O2HB_DEBUG_REGION_PINNED,
2074
&(reg->hr_db_pinned),
2075
sizeof(*(reg->hr_db_pinned)),
2076
O2HB_DB_TYPE_REGION_PINNED,
2078
if (!reg->hr_debug_pinned) {
2088
static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group,
2091
struct o2hb_region *reg = NULL;
2094
reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL);
2096
return ERR_PTR(-ENOMEM);
2098
if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) {
2099
ret = -ENAMETOOLONG;
2103
spin_lock(&o2hb_live_lock);
2104
reg->hr_region_num = 0;
2105
if (o2hb_global_heartbeat_active()) {
2106
reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap,
2108
if (reg->hr_region_num >= O2NM_MAX_REGIONS) {
2109
spin_unlock(&o2hb_live_lock);
2113
set_bit(reg->hr_region_num, o2hb_region_bitmap);
2115
list_add_tail(®->hr_all_item, &o2hb_all_regions);
2116
spin_unlock(&o2hb_live_lock);
2118
config_item_init_type_name(®->hr_item, name, &o2hb_region_type);
2120
ret = o2hb_debug_region_init(reg, o2hb_debug_dir);
2122
config_item_put(®->hr_item);
2126
return ®->hr_item;
2129
return ERR_PTR(ret);
2132
static void o2hb_heartbeat_group_drop_item(struct config_group *group,
2133
struct config_item *item)
2135
struct task_struct *hb_task;
2136
struct o2hb_region *reg = to_o2hb_region(item);
2137
int quorum_region = 0;
2139
/* stop the thread when the user removes the region dir */
2140
spin_lock(&o2hb_live_lock);
2141
hb_task = reg->hr_task;
2142
reg->hr_task = NULL;
2143
reg->hr_item_dropped = 1;
2144
spin_unlock(&o2hb_live_lock);
2147
kthread_stop(hb_task);
2149
if (o2hb_global_heartbeat_active()) {
2150
spin_lock(&o2hb_live_lock);
2151
clear_bit(reg->hr_region_num, o2hb_region_bitmap);
2152
clear_bit(reg->hr_region_num, o2hb_live_region_bitmap);
2153
if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap))
2155
clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap);
2156
spin_unlock(&o2hb_live_lock);
2157
printk(KERN_NOTICE "o2hb: Heartbeat %s on region %s (%s)\n",
2158
((atomic_read(®->hr_steady_iterations) == 0) ?
2159
"stopped" : "start aborted"), config_item_name(item),
2164
* If we're racing a dev_write(), we need to wake them. They will
2165
* check reg->hr_task
2167
if (atomic_read(®->hr_steady_iterations) != 0) {
2168
reg->hr_aborted_start = 1;
2169
atomic_set(®->hr_steady_iterations, 0);
2170
wake_up(&o2hb_steady_queue);
2173
config_item_put(item);
2175
if (!o2hb_global_heartbeat_active() || !quorum_region)
2179
* If global heartbeat active and there are dependent users,
2180
* pin all regions if quorum region count <= CUT_OFF
2182
spin_lock(&o2hb_live_lock);
2184
if (!o2hb_dependent_users)
2187
if (o2hb_pop_count(&o2hb_quorum_region_bitmap,
2188
O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
2189
o2hb_region_pin(NULL);
2192
spin_unlock(&o2hb_live_lock);
2195
struct o2hb_heartbeat_group_attribute {
2196
struct configfs_attribute attr;
2197
ssize_t (*show)(struct o2hb_heartbeat_group *, char *);
2198
ssize_t (*store)(struct o2hb_heartbeat_group *, const char *, size_t);
2201
static ssize_t o2hb_heartbeat_group_show(struct config_item *item,
2202
struct configfs_attribute *attr,
2205
struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item));
2206
struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr =
2207
container_of(attr, struct o2hb_heartbeat_group_attribute, attr);
2210
if (o2hb_heartbeat_group_attr->show)
2211
ret = o2hb_heartbeat_group_attr->show(reg, page);
2215
static ssize_t o2hb_heartbeat_group_store(struct config_item *item,
2216
struct configfs_attribute *attr,
2217
const char *page, size_t count)
2219
struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item));
2220
struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr =
2221
container_of(attr, struct o2hb_heartbeat_group_attribute, attr);
2222
ssize_t ret = -EINVAL;
2224
if (o2hb_heartbeat_group_attr->store)
2225
ret = o2hb_heartbeat_group_attr->store(reg, page, count);
2229
static ssize_t o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group *group,
2232
return sprintf(page, "%u\n", o2hb_dead_threshold);
2235
static ssize_t o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group *group,
2240
char *p = (char *)page;
2242
tmp = simple_strtoul(p, &p, 10);
2243
if (!p || (*p && (*p != '\n')))
2246
/* this will validate ranges for us. */
2247
o2hb_dead_threshold_set((unsigned int) tmp);
2253
ssize_t o2hb_heartbeat_group_mode_show(struct o2hb_heartbeat_group *group,
2256
return sprintf(page, "%s\n",
2257
o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]);
2261
ssize_t o2hb_heartbeat_group_mode_store(struct o2hb_heartbeat_group *group,
2262
const char *page, size_t count)
2268
len = (page[count - 1] == '\n') ? count - 1 : count;
2272
for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) {
2273
if (strnicmp(page, o2hb_heartbeat_mode_desc[i], len))
2276
ret = o2hb_global_hearbeat_mode_set(i);
2278
printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n",
2279
o2hb_heartbeat_mode_desc[i]);
2287
static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold = {
2288
.attr = { .ca_owner = THIS_MODULE,
2289
.ca_name = "dead_threshold",
2290
.ca_mode = S_IRUGO | S_IWUSR },
2291
.show = o2hb_heartbeat_group_threshold_show,
2292
.store = o2hb_heartbeat_group_threshold_store,
2295
static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_mode = {
2296
.attr = { .ca_owner = THIS_MODULE,
2298
.ca_mode = S_IRUGO | S_IWUSR },
2299
.show = o2hb_heartbeat_group_mode_show,
2300
.store = o2hb_heartbeat_group_mode_store,
2303
static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = {
2304
&o2hb_heartbeat_group_attr_threshold.attr,
2305
&o2hb_heartbeat_group_attr_mode.attr,
2309
static struct configfs_item_operations o2hb_hearbeat_group_item_ops = {
2310
.show_attribute = o2hb_heartbeat_group_show,
2311
.store_attribute = o2hb_heartbeat_group_store,
2314
static struct configfs_group_operations o2hb_heartbeat_group_group_ops = {
2315
.make_item = o2hb_heartbeat_group_make_item,
2316
.drop_item = o2hb_heartbeat_group_drop_item,
2319
static struct config_item_type o2hb_heartbeat_group_type = {
2320
.ct_group_ops = &o2hb_heartbeat_group_group_ops,
2321
.ct_item_ops = &o2hb_hearbeat_group_item_ops,
2322
.ct_attrs = o2hb_heartbeat_group_attrs,
2323
.ct_owner = THIS_MODULE,
2326
/* this is just here to avoid touching group in heartbeat.h which the
2327
* entire damn world #includes */
2328
struct config_group *o2hb_alloc_hb_set(void)
2330
struct o2hb_heartbeat_group *hs = NULL;
2331
struct config_group *ret = NULL;
2333
hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL);
2337
config_group_init_type_name(&hs->hs_group, "heartbeat",
2338
&o2hb_heartbeat_group_type);
2340
ret = &hs->hs_group;
2347
void o2hb_free_hb_set(struct config_group *group)
2349
struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group);
2353
/* hb callback registration and issuing */
2355
static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type)
2357
if (type == O2HB_NUM_CB)
2358
return ERR_PTR(-EINVAL);
2360
return &o2hb_callbacks[type];
2363
void o2hb_setup_callback(struct o2hb_callback_func *hc,
2364
enum o2hb_callback_type type,
2369
INIT_LIST_HEAD(&hc->hc_item);
2372
hc->hc_priority = priority;
2374
hc->hc_magic = O2HB_CB_MAGIC;
2376
EXPORT_SYMBOL_GPL(o2hb_setup_callback);
2379
* In local heartbeat mode, region_uuid passed matches the dlm domain name.
2380
* In global heartbeat mode, region_uuid passed is NULL.
2382
* In local, we only pin the matching region. In global we pin all the active
2385
static int o2hb_region_pin(const char *region_uuid)
2387
int ret = 0, found = 0;
2388
struct o2hb_region *reg;
2391
assert_spin_locked(&o2hb_live_lock);
2393
list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2394
uuid = config_item_name(®->hr_item);
2396
/* local heartbeat */
2398
if (strcmp(region_uuid, uuid))
2403
if (reg->hr_item_pinned || reg->hr_item_dropped)
2406
/* Ignore ENOENT only for local hb (userdlm domain) */
2407
ret = o2nm_depend_item(®->hr_item);
2409
mlog(ML_CLUSTER, "Pin region %s\n", uuid);
2410
reg->hr_item_pinned = 1;
2412
if (ret == -ENOENT && found)
2415
mlog(ML_ERROR, "Pin region %s fails with %d\n",
2429
* In local heartbeat mode, region_uuid passed matches the dlm domain name.
2430
* In global heartbeat mode, region_uuid passed is NULL.
2432
* In local, we only unpin the matching region. In global we unpin all the
2435
static void o2hb_region_unpin(const char *region_uuid)
2437
struct o2hb_region *reg;
2441
assert_spin_locked(&o2hb_live_lock);
2443
list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2444
uuid = config_item_name(®->hr_item);
2446
if (strcmp(region_uuid, uuid))
2451
if (reg->hr_item_pinned) {
2452
mlog(ML_CLUSTER, "Unpin region %s\n", uuid);
2453
o2nm_undepend_item(®->hr_item);
2454
reg->hr_item_pinned = 0;
2461
static int o2hb_region_inc_user(const char *region_uuid)
2465
spin_lock(&o2hb_live_lock);
2467
/* local heartbeat */
2468
if (!o2hb_global_heartbeat_active()) {
2469
ret = o2hb_region_pin(region_uuid);
2474
* if global heartbeat active and this is the first dependent user,
2475
* pin all regions if quorum region count <= CUT_OFF
2477
o2hb_dependent_users++;
2478
if (o2hb_dependent_users > 1)
2481
if (o2hb_pop_count(&o2hb_quorum_region_bitmap,
2482
O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
2483
ret = o2hb_region_pin(NULL);
2486
spin_unlock(&o2hb_live_lock);
2490
void o2hb_region_dec_user(const char *region_uuid)
2492
spin_lock(&o2hb_live_lock);
2494
/* local heartbeat */
2495
if (!o2hb_global_heartbeat_active()) {
2496
o2hb_region_unpin(region_uuid);
2501
* if global heartbeat active and there are no dependent users,
2502
* unpin all quorum regions
2504
o2hb_dependent_users--;
2505
if (!o2hb_dependent_users)
2506
o2hb_region_unpin(NULL);
2509
spin_unlock(&o2hb_live_lock);
2512
int o2hb_register_callback(const char *region_uuid,
2513
struct o2hb_callback_func *hc)
2515
struct o2hb_callback_func *tmp;
2516
struct list_head *iter;
2517
struct o2hb_callback *hbcall;
2520
BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
2521
BUG_ON(!list_empty(&hc->hc_item));
2523
hbcall = hbcall_from_type(hc->hc_type);
2524
if (IS_ERR(hbcall)) {
2525
ret = PTR_ERR(hbcall);
2530
ret = o2hb_region_inc_user(region_uuid);
2537
down_write(&o2hb_callback_sem);
2539
list_for_each(iter, &hbcall->list) {
2540
tmp = list_entry(iter, struct o2hb_callback_func, hc_item);
2541
if (hc->hc_priority < tmp->hc_priority) {
2542
list_add_tail(&hc->hc_item, iter);
2546
if (list_empty(&hc->hc_item))
2547
list_add_tail(&hc->hc_item, &hbcall->list);
2549
up_write(&o2hb_callback_sem);
2552
mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n",
2553
ret, __builtin_return_address(0), hc);
2556
EXPORT_SYMBOL_GPL(o2hb_register_callback);
2558
void o2hb_unregister_callback(const char *region_uuid,
2559
struct o2hb_callback_func *hc)
2561
BUG_ON(hc->hc_magic != O2HB_CB_MAGIC);
2563
mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n",
2564
__builtin_return_address(0), hc);
2566
/* XXX Can this happen _with_ a region reference? */
2567
if (list_empty(&hc->hc_item))
2571
o2hb_region_dec_user(region_uuid);
2573
down_write(&o2hb_callback_sem);
2575
list_del_init(&hc->hc_item);
2577
up_write(&o2hb_callback_sem);
2579
EXPORT_SYMBOL_GPL(o2hb_unregister_callback);
2581
int o2hb_check_node_heartbeating(u8 node_num)
2583
unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
2585
o2hb_fill_node_map(testing_map, sizeof(testing_map));
2586
if (!test_bit(node_num, testing_map)) {
2588
"node (%u) does not have heartbeating enabled.\n",
2595
EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating);
2597
int o2hb_check_node_heartbeating_from_callback(u8 node_num)
2599
unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
2601
o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map));
2602
if (!test_bit(node_num, testing_map)) {
2604
"node (%u) does not have heartbeating enabled.\n",
2611
EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback);
2613
/* Makes sure our local node is configured with a node number, and is
2615
int o2hb_check_local_node_heartbeating(void)
2619
/* if this node was set then we have networking */
2620
node_num = o2nm_this_node();
2621
if (node_num == O2NM_MAX_NODES) {
2622
mlog(ML_HEARTBEAT, "this node has not been configured.\n");
2626
return o2hb_check_node_heartbeating(node_num);
2628
EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating);
2631
* this is just a hack until we get the plumbing which flips file systems
2632
* read only and drops the hb ref instead of killing the node dead.
2634
void o2hb_stop_all_regions(void)
2636
struct o2hb_region *reg;
2638
mlog(ML_ERROR, "stopping heartbeat on all active regions.\n");
2640
spin_lock(&o2hb_live_lock);
2642
list_for_each_entry(reg, &o2hb_all_regions, hr_all_item)
2643
reg->hr_unclean_stop = 1;
2645
spin_unlock(&o2hb_live_lock);
2647
EXPORT_SYMBOL_GPL(o2hb_stop_all_regions);
2649
int o2hb_get_all_regions(char *region_uuids, u8 max_regions)
2651
struct o2hb_region *reg;
2655
spin_lock(&o2hb_live_lock);
2658
list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) {
2659
mlog(0, "Region: %s\n", config_item_name(®->hr_item));
2660
if (numregs < max_regions) {
2661
memcpy(p, config_item_name(®->hr_item),
2662
O2HB_MAX_REGION_NAME_LEN);
2663
p += O2HB_MAX_REGION_NAME_LEN;
2668
spin_unlock(&o2hb_live_lock);
2672
EXPORT_SYMBOL_GPL(o2hb_get_all_regions);
2674
int o2hb_global_heartbeat_active(void)
2676
return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL);
2678
EXPORT_SYMBOL(o2hb_global_heartbeat_active);