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>
37 #include "heartbeat.h"
39 #include "nodemanager.h"
46 * The first heartbeat pass had one global thread that would serialize all hb
47 * callback calls. This global serializing sem should only be removed once
48 * we've made sure that all callees can deal with being called concurrently
49 * from multiple hb region threads.
51 static DECLARE_RWSEM(o2hb_callback_sem
);
54 * multiple hb threads are watching multiple regions. A node is live
55 * whenever any of the threads sees activity from the node in its region.
57 static DEFINE_SPINLOCK(o2hb_live_lock
);
58 static struct list_head o2hb_live_slots
[O2NM_MAX_NODES
];
59 static unsigned long o2hb_live_node_bitmap
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
60 static LIST_HEAD(o2hb_node_events
);
61 static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue
);
63 static LIST_HEAD(o2hb_all_regions
);
65 static struct o2hb_callback
{
66 struct list_head list
;
67 } o2hb_callbacks
[O2HB_NUM_CB
];
69 static struct o2hb_callback
*hbcall_from_type(enum o2hb_callback_type type
);
71 #define O2HB_DEFAULT_BLOCK_BITS 9
73 unsigned int o2hb_dead_threshold
= O2HB_DEFAULT_DEAD_THRESHOLD
;
75 /* Only sets a new threshold if there are no active regions.
77 * No locking or otherwise interesting code is required for reading
78 * o2hb_dead_threshold as it can't change once regions are active and
79 * it's not interesting to anyone until then anyway. */
80 static void o2hb_dead_threshold_set(unsigned int threshold
)
82 if (threshold
> O2HB_MIN_DEAD_THRESHOLD
) {
83 spin_lock(&o2hb_live_lock
);
84 if (list_empty(&o2hb_all_regions
))
85 o2hb_dead_threshold
= threshold
;
86 spin_unlock(&o2hb_live_lock
);
90 struct o2hb_node_event
{
91 struct list_head hn_item
;
92 enum o2hb_callback_type hn_event_type
;
93 struct o2nm_node
*hn_node
;
97 struct o2hb_disk_slot
{
98 struct o2hb_disk_heartbeat_block
*ds_raw_block
;
101 u64 ds_last_generation
;
102 u16 ds_equal_samples
;
103 u16 ds_changed_samples
;
104 struct list_head ds_live_item
;
107 /* each thread owns a region.. when we're asked to tear down the region
108 * we ask the thread to stop, who cleans up the region */
110 struct config_item hr_item
;
112 struct list_head hr_all_item
;
113 unsigned hr_unclean_stop
:1;
115 /* protected by the hr_callback_sem */
116 struct task_struct
*hr_task
;
118 unsigned int hr_blocks
;
119 unsigned long long hr_start_block
;
121 unsigned int hr_block_bits
;
122 unsigned int hr_block_bytes
;
124 unsigned int hr_slots_per_page
;
125 unsigned int hr_num_pages
;
127 struct page
**hr_slot_data
;
128 struct block_device
*hr_bdev
;
129 struct o2hb_disk_slot
*hr_slots
;
131 /* let the person setting up hb wait for it to return until it
132 * has reached a 'steady' state. This will be fixed when we have
133 * a more complete api that doesn't lead to this sort of fragility. */
134 atomic_t hr_steady_iterations
;
136 char hr_dev_name
[BDEVNAME_SIZE
];
138 unsigned int hr_timeout_ms
;
140 /* randomized as the region goes up and down so that a node
141 * recognizes a node going up and down in one iteration */
144 struct delayed_work hr_write_timeout_work
;
145 unsigned long hr_last_timeout_start
;
147 /* Used during o2hb_check_slot to hold a copy of the block
148 * being checked because we temporarily have to zero out the
150 struct o2hb_disk_heartbeat_block
*hr_tmp_block
;
153 struct o2hb_bio_wait_ctxt
{
154 atomic_t wc_num_reqs
;
155 struct completion wc_io_complete
;
159 static void o2hb_write_timeout(struct work_struct
*work
)
161 struct o2hb_region
*reg
=
162 container_of(work
, struct o2hb_region
,
163 hr_write_timeout_work
.work
);
165 mlog(ML_ERROR
, "Heartbeat write timeout to device %s after %u "
166 "milliseconds\n", reg
->hr_dev_name
,
167 jiffies_to_msecs(jiffies
- reg
->hr_last_timeout_start
));
168 o2quo_disk_timeout();
171 static void o2hb_arm_write_timeout(struct o2hb_region
*reg
)
173 mlog(0, "Queue write timeout for %u ms\n", O2HB_MAX_WRITE_TIMEOUT_MS
);
175 cancel_delayed_work(®
->hr_write_timeout_work
);
176 reg
->hr_last_timeout_start
= jiffies
;
177 schedule_delayed_work(®
->hr_write_timeout_work
,
178 msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS
));
181 static void o2hb_disarm_write_timeout(struct o2hb_region
*reg
)
183 cancel_delayed_work(®
->hr_write_timeout_work
);
184 flush_scheduled_work();
187 static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt
*wc
)
189 atomic_set(&wc
->wc_num_reqs
, 1);
190 init_completion(&wc
->wc_io_complete
);
194 /* Used in error paths too */
195 static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt
*wc
,
198 /* sadly atomic_sub_and_test() isn't available on all platforms. The
199 * good news is that the fast path only completes one at a time */
201 if (atomic_dec_and_test(&wc
->wc_num_reqs
)) {
203 complete(&wc
->wc_io_complete
);
208 static void o2hb_wait_on_io(struct o2hb_region
*reg
,
209 struct o2hb_bio_wait_ctxt
*wc
)
211 struct address_space
*mapping
= reg
->hr_bdev
->bd_inode
->i_mapping
;
213 blk_run_address_space(mapping
);
214 o2hb_bio_wait_dec(wc
, 1);
216 wait_for_completion(&wc
->wc_io_complete
);
219 static int o2hb_bio_end_io(struct bio
*bio
,
220 unsigned int bytes_done
,
223 struct o2hb_bio_wait_ctxt
*wc
= bio
->bi_private
;
226 mlog(ML_ERROR
, "IO Error %d\n", error
);
227 wc
->wc_error
= error
;
233 o2hb_bio_wait_dec(wc
, 1);
238 /* Setup a Bio to cover I/O against num_slots slots starting at
240 static struct bio
*o2hb_setup_one_bio(struct o2hb_region
*reg
,
241 struct o2hb_bio_wait_ctxt
*wc
,
242 unsigned int *current_slot
,
243 unsigned int max_slots
)
245 int len
, current_page
;
246 unsigned int vec_len
, vec_start
;
247 unsigned int bits
= reg
->hr_block_bits
;
248 unsigned int spp
= reg
->hr_slots_per_page
;
249 unsigned int cs
= *current_slot
;
253 /* Testing has shown this allocation to take long enough under
254 * GFP_KERNEL that the local node can get fenced. It would be
255 * nicest if we could pre-allocate these bios and avoid this
257 bio
= bio_alloc(GFP_ATOMIC
, 16);
259 mlog(ML_ERROR
, "Could not alloc slots BIO!\n");
260 bio
= ERR_PTR(-ENOMEM
);
264 /* Must put everything in 512 byte sectors for the bio... */
265 bio
->bi_sector
= (reg
->hr_start_block
+ cs
) << (bits
- 9);
266 bio
->bi_bdev
= reg
->hr_bdev
;
267 bio
->bi_private
= wc
;
268 bio
->bi_end_io
= o2hb_bio_end_io
;
270 vec_start
= (cs
<< bits
) % PAGE_CACHE_SIZE
;
271 while(cs
< max_slots
) {
272 current_page
= cs
/ spp
;
273 page
= reg
->hr_slot_data
[current_page
];
275 vec_len
= min(PAGE_CACHE_SIZE
,
276 (max_slots
-cs
) * (PAGE_CACHE_SIZE
/spp
) );
278 mlog(ML_HB_BIO
, "page %d, vec_len = %u, vec_start = %u\n",
279 current_page
, vec_len
, vec_start
);
281 len
= bio_add_page(bio
, page
, vec_len
, vec_start
);
282 if (len
!= vec_len
) break;
284 cs
+= vec_len
/ (PAGE_CACHE_SIZE
/spp
);
293 static int o2hb_read_slots(struct o2hb_region
*reg
,
294 unsigned int max_slots
)
296 unsigned int current_slot
=0;
298 struct o2hb_bio_wait_ctxt wc
;
301 o2hb_bio_wait_init(&wc
);
303 while(current_slot
< max_slots
) {
304 bio
= o2hb_setup_one_bio(reg
, &wc
, ¤t_slot
, max_slots
);
306 status
= PTR_ERR(bio
);
311 atomic_inc(&wc
.wc_num_reqs
);
312 submit_bio(READ
, bio
);
318 o2hb_wait_on_io(reg
, &wc
);
319 if (wc
.wc_error
&& !status
)
320 status
= wc
.wc_error
;
325 static int o2hb_issue_node_write(struct o2hb_region
*reg
,
326 struct o2hb_bio_wait_ctxt
*write_wc
)
332 o2hb_bio_wait_init(write_wc
);
334 slot
= o2nm_this_node();
336 bio
= o2hb_setup_one_bio(reg
, write_wc
, &slot
, slot
+1);
338 status
= PTR_ERR(bio
);
343 atomic_inc(&write_wc
->wc_num_reqs
);
344 submit_bio(WRITE
, bio
);
351 static u32
o2hb_compute_block_crc_le(struct o2hb_region
*reg
,
352 struct o2hb_disk_heartbeat_block
*hb_block
)
357 /* We want to compute the block crc with a 0 value in the
358 * hb_cksum field. Save it off here and replace after the
360 old_cksum
= hb_block
->hb_cksum
;
361 hb_block
->hb_cksum
= 0;
363 ret
= crc32_le(0, (unsigned char *) hb_block
, reg
->hr_block_bytes
);
365 hb_block
->hb_cksum
= old_cksum
;
370 static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block
*hb_block
)
372 mlog(ML_ERROR
, "Dump slot information: seq = 0x%llx, node = %u, "
373 "cksum = 0x%x, generation 0x%llx\n",
374 (long long)le64_to_cpu(hb_block
->hb_seq
),
375 hb_block
->hb_node
, le32_to_cpu(hb_block
->hb_cksum
),
376 (long long)le64_to_cpu(hb_block
->hb_generation
));
379 static int o2hb_verify_crc(struct o2hb_region
*reg
,
380 struct o2hb_disk_heartbeat_block
*hb_block
)
384 read
= le32_to_cpu(hb_block
->hb_cksum
);
385 computed
= o2hb_compute_block_crc_le(reg
, hb_block
);
387 return read
== computed
;
390 /* We want to make sure that nobody is heartbeating on top of us --
391 * this will help detect an invalid configuration. */
392 static int o2hb_check_last_timestamp(struct o2hb_region
*reg
)
395 struct o2hb_disk_slot
*slot
;
396 struct o2hb_disk_heartbeat_block
*hb_block
;
398 node_num
= o2nm_this_node();
401 slot
= ®
->hr_slots
[node_num
];
402 /* Don't check on our 1st timestamp */
403 if (slot
->ds_last_time
) {
404 hb_block
= slot
->ds_raw_block
;
406 if (le64_to_cpu(hb_block
->hb_seq
) != slot
->ds_last_time
)
413 static inline void o2hb_prepare_block(struct o2hb_region
*reg
,
418 struct o2hb_disk_slot
*slot
;
419 struct o2hb_disk_heartbeat_block
*hb_block
;
421 node_num
= o2nm_this_node();
422 slot
= ®
->hr_slots
[node_num
];
424 hb_block
= (struct o2hb_disk_heartbeat_block
*)slot
->ds_raw_block
;
425 memset(hb_block
, 0, reg
->hr_block_bytes
);
426 /* TODO: time stuff */
427 cputime
= CURRENT_TIME
.tv_sec
;
431 hb_block
->hb_seq
= cpu_to_le64(cputime
);
432 hb_block
->hb_node
= node_num
;
433 hb_block
->hb_generation
= cpu_to_le64(generation
);
434 hb_block
->hb_dead_ms
= cpu_to_le32(o2hb_dead_threshold
* O2HB_REGION_TIMEOUT_MS
);
436 /* This step must always happen last! */
437 hb_block
->hb_cksum
= cpu_to_le32(o2hb_compute_block_crc_le(reg
,
440 mlog(ML_HB_BIO
, "our node generation = 0x%llx, cksum = 0x%x\n",
441 (long long)generation
,
442 le32_to_cpu(hb_block
->hb_cksum
));
445 static void o2hb_fire_callbacks(struct o2hb_callback
*hbcall
,
446 struct o2nm_node
*node
,
449 struct list_head
*iter
;
450 struct o2hb_callback_func
*f
;
452 list_for_each(iter
, &hbcall
->list
) {
453 f
= list_entry(iter
, struct o2hb_callback_func
, hc_item
);
454 mlog(ML_HEARTBEAT
, "calling funcs %p\n", f
);
455 (f
->hc_func
)(node
, idx
, f
->hc_data
);
459 /* Will run the list in order until we process the passed event */
460 static void o2hb_run_event_list(struct o2hb_node_event
*queued_event
)
463 struct o2hb_callback
*hbcall
;
464 struct o2hb_node_event
*event
;
466 spin_lock(&o2hb_live_lock
);
467 empty
= list_empty(&queued_event
->hn_item
);
468 spin_unlock(&o2hb_live_lock
);
472 /* Holding callback sem assures we don't alter the callback
473 * lists when doing this, and serializes ourselves with other
474 * processes wanting callbacks. */
475 down_write(&o2hb_callback_sem
);
477 spin_lock(&o2hb_live_lock
);
478 while (!list_empty(&o2hb_node_events
)
479 && !list_empty(&queued_event
->hn_item
)) {
480 event
= list_entry(o2hb_node_events
.next
,
481 struct o2hb_node_event
,
483 list_del_init(&event
->hn_item
);
484 spin_unlock(&o2hb_live_lock
);
486 mlog(ML_HEARTBEAT
, "Node %s event for %d\n",
487 event
->hn_event_type
== O2HB_NODE_UP_CB
? "UP" : "DOWN",
490 hbcall
= hbcall_from_type(event
->hn_event_type
);
492 /* We should *never* have gotten on to the list with a
493 * bad type... This isn't something that we should try
494 * to recover from. */
495 BUG_ON(IS_ERR(hbcall
));
497 o2hb_fire_callbacks(hbcall
, event
->hn_node
, event
->hn_node_num
);
499 spin_lock(&o2hb_live_lock
);
501 spin_unlock(&o2hb_live_lock
);
503 up_write(&o2hb_callback_sem
);
506 static void o2hb_queue_node_event(struct o2hb_node_event
*event
,
507 enum o2hb_callback_type type
,
508 struct o2nm_node
*node
,
511 assert_spin_locked(&o2hb_live_lock
);
513 event
->hn_event_type
= type
;
514 event
->hn_node
= node
;
515 event
->hn_node_num
= node_num
;
517 mlog(ML_HEARTBEAT
, "Queue node %s event for node %d\n",
518 type
== O2HB_NODE_UP_CB
? "UP" : "DOWN", node_num
);
520 list_add_tail(&event
->hn_item
, &o2hb_node_events
);
523 static void o2hb_shutdown_slot(struct o2hb_disk_slot
*slot
)
525 struct o2hb_node_event event
=
526 { .hn_item
= LIST_HEAD_INIT(event
.hn_item
), };
527 struct o2nm_node
*node
;
529 node
= o2nm_get_node_by_num(slot
->ds_node_num
);
533 spin_lock(&o2hb_live_lock
);
534 if (!list_empty(&slot
->ds_live_item
)) {
535 mlog(ML_HEARTBEAT
, "Shutdown, node %d leaves region\n",
538 list_del_init(&slot
->ds_live_item
);
540 if (list_empty(&o2hb_live_slots
[slot
->ds_node_num
])) {
541 clear_bit(slot
->ds_node_num
, o2hb_live_node_bitmap
);
543 o2hb_queue_node_event(&event
, O2HB_NODE_DOWN_CB
, node
,
547 spin_unlock(&o2hb_live_lock
);
549 o2hb_run_event_list(&event
);
554 static int o2hb_check_slot(struct o2hb_region
*reg
,
555 struct o2hb_disk_slot
*slot
)
557 int changed
= 0, gen_changed
= 0;
558 struct o2hb_node_event event
=
559 { .hn_item
= LIST_HEAD_INIT(event
.hn_item
), };
560 struct o2nm_node
*node
;
561 struct o2hb_disk_heartbeat_block
*hb_block
= reg
->hr_tmp_block
;
563 unsigned int dead_ms
= o2hb_dead_threshold
* O2HB_REGION_TIMEOUT_MS
;
564 unsigned int slot_dead_ms
;
566 memcpy(hb_block
, slot
->ds_raw_block
, reg
->hr_block_bytes
);
568 /* Is this correct? Do we assume that the node doesn't exist
569 * if we're not configured for him? */
570 node
= o2nm_get_node_by_num(slot
->ds_node_num
);
574 if (!o2hb_verify_crc(reg
, hb_block
)) {
575 /* all paths from here will drop o2hb_live_lock for
577 spin_lock(&o2hb_live_lock
);
579 /* Don't print an error on the console in this case -
580 * a freshly formatted heartbeat area will not have a
582 if (list_empty(&slot
->ds_live_item
))
585 /* The node is live but pushed out a bad crc. We
586 * consider it a transient miss but don't populate any
587 * other values as they may be junk. */
588 mlog(ML_ERROR
, "Node %d has written a bad crc to %s\n",
589 slot
->ds_node_num
, reg
->hr_dev_name
);
590 o2hb_dump_slot(hb_block
);
592 slot
->ds_equal_samples
++;
596 /* we don't care if these wrap.. the state transitions below
597 * clear at the right places */
598 cputime
= le64_to_cpu(hb_block
->hb_seq
);
599 if (slot
->ds_last_time
!= cputime
)
600 slot
->ds_changed_samples
++;
602 slot
->ds_equal_samples
++;
603 slot
->ds_last_time
= cputime
;
605 /* The node changed heartbeat generations. We assume this to
606 * mean it dropped off but came back before we timed out. We
607 * want to consider it down for the time being but don't want
608 * to lose any changed_samples state we might build up to
609 * considering it live again. */
610 if (slot
->ds_last_generation
!= le64_to_cpu(hb_block
->hb_generation
)) {
612 slot
->ds_equal_samples
= 0;
613 mlog(ML_HEARTBEAT
, "Node %d changed generation (0x%llx "
614 "to 0x%llx)\n", slot
->ds_node_num
,
615 (long long)slot
->ds_last_generation
,
616 (long long)le64_to_cpu(hb_block
->hb_generation
));
619 slot
->ds_last_generation
= le64_to_cpu(hb_block
->hb_generation
);
621 mlog(ML_HEARTBEAT
, "Slot %d gen 0x%llx cksum 0x%x "
622 "seq %llu last %llu changed %u equal %u\n",
623 slot
->ds_node_num
, (long long)slot
->ds_last_generation
,
624 le32_to_cpu(hb_block
->hb_cksum
),
625 (unsigned long long)le64_to_cpu(hb_block
->hb_seq
),
626 (unsigned long long)slot
->ds_last_time
, slot
->ds_changed_samples
,
627 slot
->ds_equal_samples
);
629 spin_lock(&o2hb_live_lock
);
632 /* dead nodes only come to life after some number of
633 * changes at any time during their dead time */
634 if (list_empty(&slot
->ds_live_item
) &&
635 slot
->ds_changed_samples
>= O2HB_LIVE_THRESHOLD
) {
636 mlog(ML_HEARTBEAT
, "Node %d (id 0x%llx) joined my region\n",
637 slot
->ds_node_num
, (long long)slot
->ds_last_generation
);
639 /* first on the list generates a callback */
640 if (list_empty(&o2hb_live_slots
[slot
->ds_node_num
])) {
641 set_bit(slot
->ds_node_num
, o2hb_live_node_bitmap
);
643 o2hb_queue_node_event(&event
, O2HB_NODE_UP_CB
, node
,
649 list_add_tail(&slot
->ds_live_item
,
650 &o2hb_live_slots
[slot
->ds_node_num
]);
652 slot
->ds_equal_samples
= 0;
654 /* We want to be sure that all nodes agree on the
655 * number of milliseconds before a node will be
656 * considered dead. The self-fencing timeout is
657 * computed from this value, and a discrepancy might
658 * result in heartbeat calling a node dead when it
659 * hasn't self-fenced yet. */
660 slot_dead_ms
= le32_to_cpu(hb_block
->hb_dead_ms
);
661 if (slot_dead_ms
&& slot_dead_ms
!= dead_ms
) {
662 /* TODO: Perhaps we can fail the region here. */
663 mlog(ML_ERROR
, "Node %d on device %s has a dead count "
664 "of %u ms, but our count is %u ms.\n"
665 "Please double check your configuration values "
666 "for 'O2CB_HEARTBEAT_THRESHOLD'\n",
667 slot
->ds_node_num
, reg
->hr_dev_name
, slot_dead_ms
,
673 /* if the list is dead, we're done.. */
674 if (list_empty(&slot
->ds_live_item
))
677 /* live nodes only go dead after enough consequtive missed
678 * samples.. reset the missed counter whenever we see
680 if (slot
->ds_equal_samples
>= o2hb_dead_threshold
|| gen_changed
) {
681 mlog(ML_HEARTBEAT
, "Node %d left my region\n",
684 /* last off the live_slot generates a callback */
685 list_del_init(&slot
->ds_live_item
);
686 if (list_empty(&o2hb_live_slots
[slot
->ds_node_num
])) {
687 clear_bit(slot
->ds_node_num
, o2hb_live_node_bitmap
);
689 o2hb_queue_node_event(&event
, O2HB_NODE_DOWN_CB
, node
,
695 /* We don't clear this because the node is still
696 * actually writing new blocks. */
698 slot
->ds_changed_samples
= 0;
701 if (slot
->ds_changed_samples
) {
702 slot
->ds_changed_samples
= 0;
703 slot
->ds_equal_samples
= 0;
706 spin_unlock(&o2hb_live_lock
);
708 o2hb_run_event_list(&event
);
714 /* This could be faster if we just implmented a find_last_bit, but I
715 * don't think the circumstances warrant it. */
716 static int o2hb_highest_node(unsigned long *nodes
,
723 while ((node
= find_next_bit(nodes
, numbits
, node
+ 1)) != -1) {
733 static int o2hb_do_disk_heartbeat(struct o2hb_region
*reg
)
735 int i
, ret
, highest_node
, change
= 0;
736 unsigned long configured_nodes
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
737 struct o2hb_bio_wait_ctxt write_wc
;
739 ret
= o2nm_configured_node_map(configured_nodes
,
740 sizeof(configured_nodes
));
746 highest_node
= o2hb_highest_node(configured_nodes
, O2NM_MAX_NODES
);
747 if (highest_node
>= O2NM_MAX_NODES
) {
748 mlog(ML_NOTICE
, "ocfs2_heartbeat: no configured nodes found!\n");
752 /* No sense in reading the slots of nodes that don't exist
753 * yet. Of course, if the node definitions have holes in them
754 * then we're reading an empty slot anyway... Consider this
756 ret
= o2hb_read_slots(reg
, highest_node
+ 1);
762 /* With an up to date view of the slots, we can check that no
763 * other node has been improperly configured to heartbeat in
765 if (!o2hb_check_last_timestamp(reg
))
766 mlog(ML_ERROR
, "Device \"%s\": another node is heartbeating "
767 "in our slot!\n", reg
->hr_dev_name
);
769 /* fill in the proper info for our next heartbeat */
770 o2hb_prepare_block(reg
, reg
->hr_generation
);
772 /* And fire off the write. Note that we don't wait on this I/O
774 ret
= o2hb_issue_node_write(reg
, &write_wc
);
781 while((i
= find_next_bit(configured_nodes
, O2NM_MAX_NODES
, i
+ 1)) < O2NM_MAX_NODES
) {
783 change
|= o2hb_check_slot(reg
, ®
->hr_slots
[i
]);
787 * We have to be sure we've advertised ourselves on disk
788 * before we can go to steady state. This ensures that
789 * people we find in our steady state have seen us.
791 o2hb_wait_on_io(reg
, &write_wc
);
792 if (write_wc
.wc_error
) {
793 /* Do not re-arm the write timeout on I/O error - we
794 * can't be sure that the new block ever made it to
796 mlog(ML_ERROR
, "Write error %d on device \"%s\"\n",
797 write_wc
.wc_error
, reg
->hr_dev_name
);
798 return write_wc
.wc_error
;
801 o2hb_arm_write_timeout(reg
);
803 /* let the person who launched us know when things are steady */
804 if (!change
&& (atomic_read(®
->hr_steady_iterations
) != 0)) {
805 if (atomic_dec_and_test(®
->hr_steady_iterations
))
806 wake_up(&o2hb_steady_queue
);
812 /* Subtract b from a, storing the result in a. a *must* have a larger
814 static void o2hb_tv_subtract(struct timeval
*a
,
817 /* just return 0 when a is after b */
818 if (a
->tv_sec
< b
->tv_sec
||
819 (a
->tv_sec
== b
->tv_sec
&& a
->tv_usec
< b
->tv_usec
)) {
825 a
->tv_sec
-= b
->tv_sec
;
826 a
->tv_usec
-= b
->tv_usec
;
827 while ( a
->tv_usec
< 0 ) {
829 a
->tv_usec
+= 1000000;
833 static unsigned int o2hb_elapsed_msecs(struct timeval
*start
,
836 struct timeval res
= *end
;
838 o2hb_tv_subtract(&res
, start
);
840 return res
.tv_sec
* 1000 + res
.tv_usec
/ 1000;
844 * we ride the region ref that the region dir holds. before the region
845 * dir is removed and drops it ref it will wait to tear down this
848 static int o2hb_thread(void *data
)
851 struct o2hb_region
*reg
= data
;
852 struct o2hb_bio_wait_ctxt write_wc
;
853 struct timeval before_hb
, after_hb
;
854 unsigned int elapsed_msec
;
856 mlog(ML_HEARTBEAT
|ML_KTHREAD
, "hb thread running\n");
858 set_user_nice(current
, -20);
860 while (!kthread_should_stop() && !reg
->hr_unclean_stop
) {
861 /* We track the time spent inside
862 * o2hb_do_disk_heartbeat so that we avoid more then
863 * hr_timeout_ms between disk writes. On busy systems
864 * this should result in a heartbeat which is less
865 * likely to time itself out. */
866 do_gettimeofday(&before_hb
);
870 ret
= o2hb_do_disk_heartbeat(reg
);
871 } while (ret
&& ++i
< 2);
873 do_gettimeofday(&after_hb
);
874 elapsed_msec
= o2hb_elapsed_msecs(&before_hb
, &after_hb
);
876 mlog(0, "start = %lu.%lu, end = %lu.%lu, msec = %u\n",
877 before_hb
.tv_sec
, (unsigned long) before_hb
.tv_usec
,
878 after_hb
.tv_sec
, (unsigned long) after_hb
.tv_usec
,
881 if (elapsed_msec
< reg
->hr_timeout_ms
) {
882 /* the kthread api has blocked signals for us so no
883 * need to record the return value. */
884 msleep_interruptible(reg
->hr_timeout_ms
- elapsed_msec
);
888 o2hb_disarm_write_timeout(reg
);
890 /* unclean stop is only used in very bad situation */
891 for(i
= 0; !reg
->hr_unclean_stop
&& i
< reg
->hr_blocks
; i
++)
892 o2hb_shutdown_slot(®
->hr_slots
[i
]);
894 /* Explicit down notification - avoid forcing the other nodes
895 * to timeout on this region when we could just as easily
896 * write a clear generation - thus indicating to them that
897 * this node has left this region.
899 * XXX: Should we skip this on unclean_stop? */
900 o2hb_prepare_block(reg
, 0);
901 ret
= o2hb_issue_node_write(reg
, &write_wc
);
903 o2hb_wait_on_io(reg
, &write_wc
);
908 mlog(ML_HEARTBEAT
|ML_KTHREAD
, "hb thread exiting\n");
917 for (i
= 0; i
< ARRAY_SIZE(o2hb_callbacks
); i
++)
918 INIT_LIST_HEAD(&o2hb_callbacks
[i
].list
);
920 for (i
= 0; i
< ARRAY_SIZE(o2hb_live_slots
); i
++)
921 INIT_LIST_HEAD(&o2hb_live_slots
[i
]);
923 INIT_LIST_HEAD(&o2hb_node_events
);
925 memset(o2hb_live_node_bitmap
, 0, sizeof(o2hb_live_node_bitmap
));
928 /* if we're already in a callback then we're already serialized by the sem */
929 static void o2hb_fill_node_map_from_callback(unsigned long *map
,
932 BUG_ON(bytes
< (BITS_TO_LONGS(O2NM_MAX_NODES
) * sizeof(unsigned long)));
934 memcpy(map
, &o2hb_live_node_bitmap
, bytes
);
938 * get a map of all nodes that are heartbeating in any regions
940 void o2hb_fill_node_map(unsigned long *map
, unsigned bytes
)
942 /* callers want to serialize this map and callbacks so that they
943 * can trust that they don't miss nodes coming to the party */
944 down_read(&o2hb_callback_sem
);
945 spin_lock(&o2hb_live_lock
);
946 o2hb_fill_node_map_from_callback(map
, bytes
);
947 spin_unlock(&o2hb_live_lock
);
948 up_read(&o2hb_callback_sem
);
950 EXPORT_SYMBOL_GPL(o2hb_fill_node_map
);
953 * heartbeat configfs bits. The heartbeat set is a default set under
954 * the cluster set in nodemanager.c.
957 static struct o2hb_region
*to_o2hb_region(struct config_item
*item
)
959 return item
? container_of(item
, struct o2hb_region
, hr_item
) : NULL
;
962 /* drop_item only drops its ref after killing the thread, nothing should
963 * be using the region anymore. this has to clean up any state that
964 * attributes might have built up. */
965 static void o2hb_region_release(struct config_item
*item
)
969 struct o2hb_region
*reg
= to_o2hb_region(item
);
971 if (reg
->hr_tmp_block
)
972 kfree(reg
->hr_tmp_block
);
974 if (reg
->hr_slot_data
) {
975 for (i
= 0; i
< reg
->hr_num_pages
; i
++) {
976 page
= reg
->hr_slot_data
[i
];
980 kfree(reg
->hr_slot_data
);
984 blkdev_put(reg
->hr_bdev
);
987 kfree(reg
->hr_slots
);
989 spin_lock(&o2hb_live_lock
);
990 list_del(®
->hr_all_item
);
991 spin_unlock(&o2hb_live_lock
);
996 static int o2hb_read_block_input(struct o2hb_region
*reg
,
999 unsigned long *ret_bytes
,
1000 unsigned int *ret_bits
)
1002 unsigned long bytes
;
1003 char *p
= (char *)page
;
1005 bytes
= simple_strtoul(p
, &p
, 0);
1006 if (!p
|| (*p
&& (*p
!= '\n')))
1009 /* Heartbeat and fs min / max block sizes are the same. */
1010 if (bytes
> 4096 || bytes
< 512)
1012 if (hweight16(bytes
) != 1)
1018 *ret_bits
= ffs(bytes
) - 1;
1023 static ssize_t
o2hb_region_block_bytes_read(struct o2hb_region
*reg
,
1026 return sprintf(page
, "%u\n", reg
->hr_block_bytes
);
1029 static ssize_t
o2hb_region_block_bytes_write(struct o2hb_region
*reg
,
1034 unsigned long block_bytes
;
1035 unsigned int block_bits
;
1040 status
= o2hb_read_block_input(reg
, page
, count
,
1041 &block_bytes
, &block_bits
);
1045 reg
->hr_block_bytes
= (unsigned int)block_bytes
;
1046 reg
->hr_block_bits
= block_bits
;
1051 static ssize_t
o2hb_region_start_block_read(struct o2hb_region
*reg
,
1054 return sprintf(page
, "%llu\n", reg
->hr_start_block
);
1057 static ssize_t
o2hb_region_start_block_write(struct o2hb_region
*reg
,
1061 unsigned long long tmp
;
1062 char *p
= (char *)page
;
1067 tmp
= simple_strtoull(p
, &p
, 0);
1068 if (!p
|| (*p
&& (*p
!= '\n')))
1071 reg
->hr_start_block
= tmp
;
1076 static ssize_t
o2hb_region_blocks_read(struct o2hb_region
*reg
,
1079 return sprintf(page
, "%d\n", reg
->hr_blocks
);
1082 static ssize_t
o2hb_region_blocks_write(struct o2hb_region
*reg
,
1087 char *p
= (char *)page
;
1092 tmp
= simple_strtoul(p
, &p
, 0);
1093 if (!p
|| (*p
&& (*p
!= '\n')))
1096 if (tmp
> O2NM_MAX_NODES
|| tmp
== 0)
1099 reg
->hr_blocks
= (unsigned int)tmp
;
1104 static ssize_t
o2hb_region_dev_read(struct o2hb_region
*reg
,
1107 unsigned int ret
= 0;
1110 ret
= sprintf(page
, "%s\n", reg
->hr_dev_name
);
1115 static void o2hb_init_region_params(struct o2hb_region
*reg
)
1117 reg
->hr_slots_per_page
= PAGE_CACHE_SIZE
>> reg
->hr_block_bits
;
1118 reg
->hr_timeout_ms
= O2HB_REGION_TIMEOUT_MS
;
1120 mlog(ML_HEARTBEAT
, "hr_start_block = %llu, hr_blocks = %u\n",
1121 reg
->hr_start_block
, reg
->hr_blocks
);
1122 mlog(ML_HEARTBEAT
, "hr_block_bytes = %u, hr_block_bits = %u\n",
1123 reg
->hr_block_bytes
, reg
->hr_block_bits
);
1124 mlog(ML_HEARTBEAT
, "hr_timeout_ms = %u\n", reg
->hr_timeout_ms
);
1125 mlog(ML_HEARTBEAT
, "dead threshold = %u\n", o2hb_dead_threshold
);
1128 static int o2hb_map_slot_data(struct o2hb_region
*reg
)
1131 unsigned int last_slot
;
1132 unsigned int spp
= reg
->hr_slots_per_page
;
1135 struct o2hb_disk_slot
*slot
;
1137 reg
->hr_tmp_block
= kmalloc(reg
->hr_block_bytes
, GFP_KERNEL
);
1138 if (reg
->hr_tmp_block
== NULL
) {
1139 mlog_errno(-ENOMEM
);
1143 reg
->hr_slots
= kcalloc(reg
->hr_blocks
,
1144 sizeof(struct o2hb_disk_slot
), GFP_KERNEL
);
1145 if (reg
->hr_slots
== NULL
) {
1146 mlog_errno(-ENOMEM
);
1150 for(i
= 0; i
< reg
->hr_blocks
; i
++) {
1151 slot
= ®
->hr_slots
[i
];
1152 slot
->ds_node_num
= i
;
1153 INIT_LIST_HEAD(&slot
->ds_live_item
);
1154 slot
->ds_raw_block
= NULL
;
1157 reg
->hr_num_pages
= (reg
->hr_blocks
+ spp
- 1) / spp
;
1158 mlog(ML_HEARTBEAT
, "Going to require %u pages to cover %u blocks "
1159 "at %u blocks per page\n",
1160 reg
->hr_num_pages
, reg
->hr_blocks
, spp
);
1162 reg
->hr_slot_data
= kcalloc(reg
->hr_num_pages
, sizeof(struct page
*),
1164 if (!reg
->hr_slot_data
) {
1165 mlog_errno(-ENOMEM
);
1169 for(i
= 0; i
< reg
->hr_num_pages
; i
++) {
1170 page
= alloc_page(GFP_KERNEL
);
1172 mlog_errno(-ENOMEM
);
1176 reg
->hr_slot_data
[i
] = page
;
1178 last_slot
= i
* spp
;
1179 raw
= page_address(page
);
1181 (j
< spp
) && ((j
+ last_slot
) < reg
->hr_blocks
);
1183 BUG_ON((j
+ last_slot
) >= reg
->hr_blocks
);
1185 slot
= ®
->hr_slots
[j
+ last_slot
];
1186 slot
->ds_raw_block
=
1187 (struct o2hb_disk_heartbeat_block
*) raw
;
1189 raw
+= reg
->hr_block_bytes
;
1196 /* Read in all the slots available and populate the tracking
1197 * structures so that we can start with a baseline idea of what's
1199 static int o2hb_populate_slot_data(struct o2hb_region
*reg
)
1202 struct o2hb_disk_slot
*slot
;
1203 struct o2hb_disk_heartbeat_block
*hb_block
;
1207 ret
= o2hb_read_slots(reg
, reg
->hr_blocks
);
1213 /* We only want to get an idea of the values initially in each
1214 * slot, so we do no verification - o2hb_check_slot will
1215 * actually determine if each configured slot is valid and
1216 * whether any values have changed. */
1217 for(i
= 0; i
< reg
->hr_blocks
; i
++) {
1218 slot
= ®
->hr_slots
[i
];
1219 hb_block
= (struct o2hb_disk_heartbeat_block
*) slot
->ds_raw_block
;
1221 /* Only fill the values that o2hb_check_slot uses to
1222 * determine changing slots */
1223 slot
->ds_last_time
= le64_to_cpu(hb_block
->hb_seq
);
1224 slot
->ds_last_generation
= le64_to_cpu(hb_block
->hb_generation
);
1232 /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */
1233 static ssize_t
o2hb_region_dev_write(struct o2hb_region
*reg
,
1237 struct task_struct
*hb_task
;
1240 char *p
= (char *)page
;
1241 struct file
*filp
= NULL
;
1242 struct inode
*inode
= NULL
;
1243 ssize_t ret
= -EINVAL
;
1248 /* We can't heartbeat without having had our node number
1249 * configured yet. */
1250 if (o2nm_this_node() == O2NM_MAX_NODES
)
1253 fd
= simple_strtol(p
, &p
, 0);
1254 if (!p
|| (*p
&& (*p
!= '\n')))
1257 if (fd
< 0 || fd
>= INT_MAX
)
1264 if (reg
->hr_blocks
== 0 || reg
->hr_start_block
== 0 ||
1265 reg
->hr_block_bytes
== 0)
1268 inode
= igrab(filp
->f_mapping
->host
);
1272 if (!S_ISBLK(inode
->i_mode
))
1275 reg
->hr_bdev
= I_BDEV(filp
->f_mapping
->host
);
1276 ret
= blkdev_get(reg
->hr_bdev
, FMODE_WRITE
| FMODE_READ
, 0);
1278 reg
->hr_bdev
= NULL
;
1283 bdevname(reg
->hr_bdev
, reg
->hr_dev_name
);
1285 sectsize
= bdev_hardsect_size(reg
->hr_bdev
);
1286 if (sectsize
!= reg
->hr_block_bytes
) {
1288 "blocksize %u incorrect for device, expected %d",
1289 reg
->hr_block_bytes
, sectsize
);
1294 o2hb_init_region_params(reg
);
1296 /* Generation of zero is invalid */
1298 get_random_bytes(®
->hr_generation
,
1299 sizeof(reg
->hr_generation
));
1300 } while (reg
->hr_generation
== 0);
1302 ret
= o2hb_map_slot_data(reg
);
1308 ret
= o2hb_populate_slot_data(reg
);
1314 INIT_DELAYED_WORK(®
->hr_write_timeout_work
, o2hb_write_timeout
);
1317 * A node is considered live after it has beat LIVE_THRESHOLD
1318 * times. We're not steady until we've given them a chance
1319 * _after_ our first read.
1321 atomic_set(®
->hr_steady_iterations
, O2HB_LIVE_THRESHOLD
+ 1);
1323 hb_task
= kthread_run(o2hb_thread
, reg
, "o2hb-%s",
1324 reg
->hr_item
.ci_name
);
1325 if (IS_ERR(hb_task
)) {
1326 ret
= PTR_ERR(hb_task
);
1331 spin_lock(&o2hb_live_lock
);
1332 reg
->hr_task
= hb_task
;
1333 spin_unlock(&o2hb_live_lock
);
1335 ret
= wait_event_interruptible(o2hb_steady_queue
,
1336 atomic_read(®
->hr_steady_iterations
) == 0);
1338 spin_lock(&o2hb_live_lock
);
1339 hb_task
= reg
->hr_task
;
1340 reg
->hr_task
= NULL
;
1341 spin_unlock(&o2hb_live_lock
);
1344 kthread_stop(hb_task
);
1356 blkdev_put(reg
->hr_bdev
);
1357 reg
->hr_bdev
= NULL
;
1363 static ssize_t
o2hb_region_pid_read(struct o2hb_region
*reg
,
1368 spin_lock(&o2hb_live_lock
);
1370 pid
= reg
->hr_task
->pid
;
1371 spin_unlock(&o2hb_live_lock
);
1376 return sprintf(page
, "%u\n", pid
);
1379 struct o2hb_region_attribute
{
1380 struct configfs_attribute attr
;
1381 ssize_t (*show
)(struct o2hb_region
*, char *);
1382 ssize_t (*store
)(struct o2hb_region
*, const char *, size_t);
1385 static struct o2hb_region_attribute o2hb_region_attr_block_bytes
= {
1386 .attr
= { .ca_owner
= THIS_MODULE
,
1387 .ca_name
= "block_bytes",
1388 .ca_mode
= S_IRUGO
| S_IWUSR
},
1389 .show
= o2hb_region_block_bytes_read
,
1390 .store
= o2hb_region_block_bytes_write
,
1393 static struct o2hb_region_attribute o2hb_region_attr_start_block
= {
1394 .attr
= { .ca_owner
= THIS_MODULE
,
1395 .ca_name
= "start_block",
1396 .ca_mode
= S_IRUGO
| S_IWUSR
},
1397 .show
= o2hb_region_start_block_read
,
1398 .store
= o2hb_region_start_block_write
,
1401 static struct o2hb_region_attribute o2hb_region_attr_blocks
= {
1402 .attr
= { .ca_owner
= THIS_MODULE
,
1403 .ca_name
= "blocks",
1404 .ca_mode
= S_IRUGO
| S_IWUSR
},
1405 .show
= o2hb_region_blocks_read
,
1406 .store
= o2hb_region_blocks_write
,
1409 static struct o2hb_region_attribute o2hb_region_attr_dev
= {
1410 .attr
= { .ca_owner
= THIS_MODULE
,
1412 .ca_mode
= S_IRUGO
| S_IWUSR
},
1413 .show
= o2hb_region_dev_read
,
1414 .store
= o2hb_region_dev_write
,
1417 static struct o2hb_region_attribute o2hb_region_attr_pid
= {
1418 .attr
= { .ca_owner
= THIS_MODULE
,
1420 .ca_mode
= S_IRUGO
| S_IRUSR
},
1421 .show
= o2hb_region_pid_read
,
1424 static struct configfs_attribute
*o2hb_region_attrs
[] = {
1425 &o2hb_region_attr_block_bytes
.attr
,
1426 &o2hb_region_attr_start_block
.attr
,
1427 &o2hb_region_attr_blocks
.attr
,
1428 &o2hb_region_attr_dev
.attr
,
1429 &o2hb_region_attr_pid
.attr
,
1433 static ssize_t
o2hb_region_show(struct config_item
*item
,
1434 struct configfs_attribute
*attr
,
1437 struct o2hb_region
*reg
= to_o2hb_region(item
);
1438 struct o2hb_region_attribute
*o2hb_region_attr
=
1439 container_of(attr
, struct o2hb_region_attribute
, attr
);
1442 if (o2hb_region_attr
->show
)
1443 ret
= o2hb_region_attr
->show(reg
, page
);
1447 static ssize_t
o2hb_region_store(struct config_item
*item
,
1448 struct configfs_attribute
*attr
,
1449 const char *page
, size_t count
)
1451 struct o2hb_region
*reg
= to_o2hb_region(item
);
1452 struct o2hb_region_attribute
*o2hb_region_attr
=
1453 container_of(attr
, struct o2hb_region_attribute
, attr
);
1454 ssize_t ret
= -EINVAL
;
1456 if (o2hb_region_attr
->store
)
1457 ret
= o2hb_region_attr
->store(reg
, page
, count
);
1461 static struct configfs_item_operations o2hb_region_item_ops
= {
1462 .release
= o2hb_region_release
,
1463 .show_attribute
= o2hb_region_show
,
1464 .store_attribute
= o2hb_region_store
,
1467 static struct config_item_type o2hb_region_type
= {
1468 .ct_item_ops
= &o2hb_region_item_ops
,
1469 .ct_attrs
= o2hb_region_attrs
,
1470 .ct_owner
= THIS_MODULE
,
1475 struct o2hb_heartbeat_group
{
1476 struct config_group hs_group
;
1480 static struct o2hb_heartbeat_group
*to_o2hb_heartbeat_group(struct config_group
*group
)
1483 container_of(group
, struct o2hb_heartbeat_group
, hs_group
)
1487 static struct config_item
*o2hb_heartbeat_group_make_item(struct config_group
*group
,
1490 struct o2hb_region
*reg
= NULL
;
1491 struct config_item
*ret
= NULL
;
1493 reg
= kzalloc(sizeof(struct o2hb_region
), GFP_KERNEL
);
1495 goto out
; /* ENOMEM */
1497 config_item_init_type_name(®
->hr_item
, name
, &o2hb_region_type
);
1499 ret
= ®
->hr_item
;
1501 spin_lock(&o2hb_live_lock
);
1502 list_add_tail(®
->hr_all_item
, &o2hb_all_regions
);
1503 spin_unlock(&o2hb_live_lock
);
1511 static void o2hb_heartbeat_group_drop_item(struct config_group
*group
,
1512 struct config_item
*item
)
1514 struct task_struct
*hb_task
;
1515 struct o2hb_region
*reg
= to_o2hb_region(item
);
1517 /* stop the thread when the user removes the region dir */
1518 spin_lock(&o2hb_live_lock
);
1519 hb_task
= reg
->hr_task
;
1520 reg
->hr_task
= NULL
;
1521 spin_unlock(&o2hb_live_lock
);
1524 kthread_stop(hb_task
);
1526 config_item_put(item
);
1529 struct o2hb_heartbeat_group_attribute
{
1530 struct configfs_attribute attr
;
1531 ssize_t (*show
)(struct o2hb_heartbeat_group
*, char *);
1532 ssize_t (*store
)(struct o2hb_heartbeat_group
*, const char *, size_t);
1535 static ssize_t
o2hb_heartbeat_group_show(struct config_item
*item
,
1536 struct configfs_attribute
*attr
,
1539 struct o2hb_heartbeat_group
*reg
= to_o2hb_heartbeat_group(to_config_group(item
));
1540 struct o2hb_heartbeat_group_attribute
*o2hb_heartbeat_group_attr
=
1541 container_of(attr
, struct o2hb_heartbeat_group_attribute
, attr
);
1544 if (o2hb_heartbeat_group_attr
->show
)
1545 ret
= o2hb_heartbeat_group_attr
->show(reg
, page
);
1549 static ssize_t
o2hb_heartbeat_group_store(struct config_item
*item
,
1550 struct configfs_attribute
*attr
,
1551 const char *page
, size_t count
)
1553 struct o2hb_heartbeat_group
*reg
= to_o2hb_heartbeat_group(to_config_group(item
));
1554 struct o2hb_heartbeat_group_attribute
*o2hb_heartbeat_group_attr
=
1555 container_of(attr
, struct o2hb_heartbeat_group_attribute
, attr
);
1556 ssize_t ret
= -EINVAL
;
1558 if (o2hb_heartbeat_group_attr
->store
)
1559 ret
= o2hb_heartbeat_group_attr
->store(reg
, page
, count
);
1563 static ssize_t
o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group
*group
,
1566 return sprintf(page
, "%u\n", o2hb_dead_threshold
);
1569 static ssize_t
o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group
*group
,
1574 char *p
= (char *)page
;
1576 tmp
= simple_strtoul(p
, &p
, 10);
1577 if (!p
|| (*p
&& (*p
!= '\n')))
1580 /* this will validate ranges for us. */
1581 o2hb_dead_threshold_set((unsigned int) tmp
);
1586 static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold
= {
1587 .attr
= { .ca_owner
= THIS_MODULE
,
1588 .ca_name
= "dead_threshold",
1589 .ca_mode
= S_IRUGO
| S_IWUSR
},
1590 .show
= o2hb_heartbeat_group_threshold_show
,
1591 .store
= o2hb_heartbeat_group_threshold_store
,
1594 static struct configfs_attribute
*o2hb_heartbeat_group_attrs
[] = {
1595 &o2hb_heartbeat_group_attr_threshold
.attr
,
1599 static struct configfs_item_operations o2hb_hearbeat_group_item_ops
= {
1600 .show_attribute
= o2hb_heartbeat_group_show
,
1601 .store_attribute
= o2hb_heartbeat_group_store
,
1604 static struct configfs_group_operations o2hb_heartbeat_group_group_ops
= {
1605 .make_item
= o2hb_heartbeat_group_make_item
,
1606 .drop_item
= o2hb_heartbeat_group_drop_item
,
1609 static struct config_item_type o2hb_heartbeat_group_type
= {
1610 .ct_group_ops
= &o2hb_heartbeat_group_group_ops
,
1611 .ct_item_ops
= &o2hb_hearbeat_group_item_ops
,
1612 .ct_attrs
= o2hb_heartbeat_group_attrs
,
1613 .ct_owner
= THIS_MODULE
,
1616 /* this is just here to avoid touching group in heartbeat.h which the
1617 * entire damn world #includes */
1618 struct config_group
*o2hb_alloc_hb_set(void)
1620 struct o2hb_heartbeat_group
*hs
= NULL
;
1621 struct config_group
*ret
= NULL
;
1623 hs
= kzalloc(sizeof(struct o2hb_heartbeat_group
), GFP_KERNEL
);
1627 config_group_init_type_name(&hs
->hs_group
, "heartbeat",
1628 &o2hb_heartbeat_group_type
);
1630 ret
= &hs
->hs_group
;
1637 void o2hb_free_hb_set(struct config_group
*group
)
1639 struct o2hb_heartbeat_group
*hs
= to_o2hb_heartbeat_group(group
);
1643 /* hb callback registration and issueing */
1645 static struct o2hb_callback
*hbcall_from_type(enum o2hb_callback_type type
)
1647 if (type
== O2HB_NUM_CB
)
1648 return ERR_PTR(-EINVAL
);
1650 return &o2hb_callbacks
[type
];
1653 void o2hb_setup_callback(struct o2hb_callback_func
*hc
,
1654 enum o2hb_callback_type type
,
1659 INIT_LIST_HEAD(&hc
->hc_item
);
1662 hc
->hc_priority
= priority
;
1664 hc
->hc_magic
= O2HB_CB_MAGIC
;
1666 EXPORT_SYMBOL_GPL(o2hb_setup_callback
);
1668 int o2hb_register_callback(struct o2hb_callback_func
*hc
)
1670 struct o2hb_callback_func
*tmp
;
1671 struct list_head
*iter
;
1672 struct o2hb_callback
*hbcall
;
1675 BUG_ON(hc
->hc_magic
!= O2HB_CB_MAGIC
);
1676 BUG_ON(!list_empty(&hc
->hc_item
));
1678 hbcall
= hbcall_from_type(hc
->hc_type
);
1679 if (IS_ERR(hbcall
)) {
1680 ret
= PTR_ERR(hbcall
);
1684 down_write(&o2hb_callback_sem
);
1686 list_for_each(iter
, &hbcall
->list
) {
1687 tmp
= list_entry(iter
, struct o2hb_callback_func
, hc_item
);
1688 if (hc
->hc_priority
< tmp
->hc_priority
) {
1689 list_add_tail(&hc
->hc_item
, iter
);
1693 if (list_empty(&hc
->hc_item
))
1694 list_add_tail(&hc
->hc_item
, &hbcall
->list
);
1696 up_write(&o2hb_callback_sem
);
1699 mlog(ML_HEARTBEAT
, "returning %d on behalf of %p for funcs %p\n",
1700 ret
, __builtin_return_address(0), hc
);
1703 EXPORT_SYMBOL_GPL(o2hb_register_callback
);
1705 void o2hb_unregister_callback(struct o2hb_callback_func
*hc
)
1707 BUG_ON(hc
->hc_magic
!= O2HB_CB_MAGIC
);
1709 mlog(ML_HEARTBEAT
, "on behalf of %p for funcs %p\n",
1710 __builtin_return_address(0), hc
);
1712 if (list_empty(&hc
->hc_item
))
1715 down_write(&o2hb_callback_sem
);
1717 list_del_init(&hc
->hc_item
);
1719 up_write(&o2hb_callback_sem
);
1721 EXPORT_SYMBOL_GPL(o2hb_unregister_callback
);
1723 int o2hb_check_node_heartbeating(u8 node_num
)
1725 unsigned long testing_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1727 o2hb_fill_node_map(testing_map
, sizeof(testing_map
));
1728 if (!test_bit(node_num
, testing_map
)) {
1730 "node (%u) does not have heartbeating enabled.\n",
1737 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating
);
1739 int o2hb_check_node_heartbeating_from_callback(u8 node_num
)
1741 unsigned long testing_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1743 o2hb_fill_node_map_from_callback(testing_map
, sizeof(testing_map
));
1744 if (!test_bit(node_num
, testing_map
)) {
1746 "node (%u) does not have heartbeating enabled.\n",
1753 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback
);
1755 /* Makes sure our local node is configured with a node number, and is
1757 int o2hb_check_local_node_heartbeating(void)
1761 /* if this node was set then we have networking */
1762 node_num
= o2nm_this_node();
1763 if (node_num
== O2NM_MAX_NODES
) {
1764 mlog(ML_HEARTBEAT
, "this node has not been configured.\n");
1768 return o2hb_check_node_heartbeating(node_num
);
1770 EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating
);
1773 * this is just a hack until we get the plumbing which flips file systems
1774 * read only and drops the hb ref instead of killing the node dead.
1776 void o2hb_stop_all_regions(void)
1778 struct o2hb_region
*reg
;
1780 mlog(ML_ERROR
, "stopping heartbeat on all active regions.\n");
1782 spin_lock(&o2hb_live_lock
);
1784 list_for_each_entry(reg
, &o2hb_all_regions
, hr_all_item
)
1785 reg
->hr_unclean_stop
= 1;
1787 spin_unlock(&o2hb_live_lock
);
1789 EXPORT_SYMBOL_GPL(o2hb_stop_all_regions
);