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
,
222 struct o2hb_bio_wait_ctxt
*wc
= bio
->bi_private
;
225 mlog(ML_ERROR
, "IO Error %d\n", error
);
226 wc
->wc_error
= error
;
229 o2hb_bio_wait_dec(wc
, 1);
234 /* Setup a Bio to cover I/O against num_slots slots starting at
236 static struct bio
*o2hb_setup_one_bio(struct o2hb_region
*reg
,
237 struct o2hb_bio_wait_ctxt
*wc
,
238 unsigned int *current_slot
,
239 unsigned int max_slots
)
241 int len
, current_page
;
242 unsigned int vec_len
, vec_start
;
243 unsigned int bits
= reg
->hr_block_bits
;
244 unsigned int spp
= reg
->hr_slots_per_page
;
245 unsigned int cs
= *current_slot
;
249 /* Testing has shown this allocation to take long enough under
250 * GFP_KERNEL that the local node can get fenced. It would be
251 * nicest if we could pre-allocate these bios and avoid this
253 bio
= bio_alloc(GFP_ATOMIC
, 16);
255 mlog(ML_ERROR
, "Could not alloc slots BIO!\n");
256 bio
= ERR_PTR(-ENOMEM
);
260 /* Must put everything in 512 byte sectors for the bio... */
261 bio
->bi_sector
= (reg
->hr_start_block
+ cs
) << (bits
- 9);
262 bio
->bi_bdev
= reg
->hr_bdev
;
263 bio
->bi_private
= wc
;
264 bio
->bi_end_io
= o2hb_bio_end_io
;
266 vec_start
= (cs
<< bits
) % PAGE_CACHE_SIZE
;
267 while(cs
< max_slots
) {
268 current_page
= cs
/ spp
;
269 page
= reg
->hr_slot_data
[current_page
];
271 vec_len
= min(PAGE_CACHE_SIZE
,
272 (max_slots
-cs
) * (PAGE_CACHE_SIZE
/spp
) );
274 mlog(ML_HB_BIO
, "page %d, vec_len = %u, vec_start = %u\n",
275 current_page
, vec_len
, vec_start
);
277 len
= bio_add_page(bio
, page
, vec_len
, vec_start
);
278 if (len
!= vec_len
) break;
280 cs
+= vec_len
/ (PAGE_CACHE_SIZE
/spp
);
289 static int o2hb_read_slots(struct o2hb_region
*reg
,
290 unsigned int max_slots
)
292 unsigned int current_slot
=0;
294 struct o2hb_bio_wait_ctxt wc
;
297 o2hb_bio_wait_init(&wc
);
299 while(current_slot
< max_slots
) {
300 bio
= o2hb_setup_one_bio(reg
, &wc
, ¤t_slot
, max_slots
);
302 status
= PTR_ERR(bio
);
307 atomic_inc(&wc
.wc_num_reqs
);
308 submit_bio(READ
, bio
);
314 o2hb_wait_on_io(reg
, &wc
);
315 if (wc
.wc_error
&& !status
)
316 status
= wc
.wc_error
;
321 static int o2hb_issue_node_write(struct o2hb_region
*reg
,
322 struct o2hb_bio_wait_ctxt
*write_wc
)
328 o2hb_bio_wait_init(write_wc
);
330 slot
= o2nm_this_node();
332 bio
= o2hb_setup_one_bio(reg
, write_wc
, &slot
, slot
+1);
334 status
= PTR_ERR(bio
);
339 atomic_inc(&write_wc
->wc_num_reqs
);
340 submit_bio(WRITE
, bio
);
347 static u32
o2hb_compute_block_crc_le(struct o2hb_region
*reg
,
348 struct o2hb_disk_heartbeat_block
*hb_block
)
353 /* We want to compute the block crc with a 0 value in the
354 * hb_cksum field. Save it off here and replace after the
356 old_cksum
= hb_block
->hb_cksum
;
357 hb_block
->hb_cksum
= 0;
359 ret
= crc32_le(0, (unsigned char *) hb_block
, reg
->hr_block_bytes
);
361 hb_block
->hb_cksum
= old_cksum
;
366 static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block
*hb_block
)
368 mlog(ML_ERROR
, "Dump slot information: seq = 0x%llx, node = %u, "
369 "cksum = 0x%x, generation 0x%llx\n",
370 (long long)le64_to_cpu(hb_block
->hb_seq
),
371 hb_block
->hb_node
, le32_to_cpu(hb_block
->hb_cksum
),
372 (long long)le64_to_cpu(hb_block
->hb_generation
));
375 static int o2hb_verify_crc(struct o2hb_region
*reg
,
376 struct o2hb_disk_heartbeat_block
*hb_block
)
380 read
= le32_to_cpu(hb_block
->hb_cksum
);
381 computed
= o2hb_compute_block_crc_le(reg
, hb_block
);
383 return read
== computed
;
386 /* We want to make sure that nobody is heartbeating on top of us --
387 * this will help detect an invalid configuration. */
388 static int o2hb_check_last_timestamp(struct o2hb_region
*reg
)
391 struct o2hb_disk_slot
*slot
;
392 struct o2hb_disk_heartbeat_block
*hb_block
;
394 node_num
= o2nm_this_node();
397 slot
= ®
->hr_slots
[node_num
];
398 /* Don't check on our 1st timestamp */
399 if (slot
->ds_last_time
) {
400 hb_block
= slot
->ds_raw_block
;
402 if (le64_to_cpu(hb_block
->hb_seq
) != slot
->ds_last_time
)
409 static inline void o2hb_prepare_block(struct o2hb_region
*reg
,
414 struct o2hb_disk_slot
*slot
;
415 struct o2hb_disk_heartbeat_block
*hb_block
;
417 node_num
= o2nm_this_node();
418 slot
= ®
->hr_slots
[node_num
];
420 hb_block
= (struct o2hb_disk_heartbeat_block
*)slot
->ds_raw_block
;
421 memset(hb_block
, 0, reg
->hr_block_bytes
);
422 /* TODO: time stuff */
423 cputime
= CURRENT_TIME
.tv_sec
;
427 hb_block
->hb_seq
= cpu_to_le64(cputime
);
428 hb_block
->hb_node
= node_num
;
429 hb_block
->hb_generation
= cpu_to_le64(generation
);
430 hb_block
->hb_dead_ms
= cpu_to_le32(o2hb_dead_threshold
* O2HB_REGION_TIMEOUT_MS
);
432 /* This step must always happen last! */
433 hb_block
->hb_cksum
= cpu_to_le32(o2hb_compute_block_crc_le(reg
,
436 mlog(ML_HB_BIO
, "our node generation = 0x%llx, cksum = 0x%x\n",
437 (long long)generation
,
438 le32_to_cpu(hb_block
->hb_cksum
));
441 static void o2hb_fire_callbacks(struct o2hb_callback
*hbcall
,
442 struct o2nm_node
*node
,
445 struct list_head
*iter
;
446 struct o2hb_callback_func
*f
;
448 list_for_each(iter
, &hbcall
->list
) {
449 f
= list_entry(iter
, struct o2hb_callback_func
, hc_item
);
450 mlog(ML_HEARTBEAT
, "calling funcs %p\n", f
);
451 (f
->hc_func
)(node
, idx
, f
->hc_data
);
455 /* Will run the list in order until we process the passed event */
456 static void o2hb_run_event_list(struct o2hb_node_event
*queued_event
)
459 struct o2hb_callback
*hbcall
;
460 struct o2hb_node_event
*event
;
462 spin_lock(&o2hb_live_lock
);
463 empty
= list_empty(&queued_event
->hn_item
);
464 spin_unlock(&o2hb_live_lock
);
468 /* Holding callback sem assures we don't alter the callback
469 * lists when doing this, and serializes ourselves with other
470 * processes wanting callbacks. */
471 down_write(&o2hb_callback_sem
);
473 spin_lock(&o2hb_live_lock
);
474 while (!list_empty(&o2hb_node_events
)
475 && !list_empty(&queued_event
->hn_item
)) {
476 event
= list_entry(o2hb_node_events
.next
,
477 struct o2hb_node_event
,
479 list_del_init(&event
->hn_item
);
480 spin_unlock(&o2hb_live_lock
);
482 mlog(ML_HEARTBEAT
, "Node %s event for %d\n",
483 event
->hn_event_type
== O2HB_NODE_UP_CB
? "UP" : "DOWN",
486 hbcall
= hbcall_from_type(event
->hn_event_type
);
488 /* We should *never* have gotten on to the list with a
489 * bad type... This isn't something that we should try
490 * to recover from. */
491 BUG_ON(IS_ERR(hbcall
));
493 o2hb_fire_callbacks(hbcall
, event
->hn_node
, event
->hn_node_num
);
495 spin_lock(&o2hb_live_lock
);
497 spin_unlock(&o2hb_live_lock
);
499 up_write(&o2hb_callback_sem
);
502 static void o2hb_queue_node_event(struct o2hb_node_event
*event
,
503 enum o2hb_callback_type type
,
504 struct o2nm_node
*node
,
507 assert_spin_locked(&o2hb_live_lock
);
509 event
->hn_event_type
= type
;
510 event
->hn_node
= node
;
511 event
->hn_node_num
= node_num
;
513 mlog(ML_HEARTBEAT
, "Queue node %s event for node %d\n",
514 type
== O2HB_NODE_UP_CB
? "UP" : "DOWN", node_num
);
516 list_add_tail(&event
->hn_item
, &o2hb_node_events
);
519 static void o2hb_shutdown_slot(struct o2hb_disk_slot
*slot
)
521 struct o2hb_node_event event
=
522 { .hn_item
= LIST_HEAD_INIT(event
.hn_item
), };
523 struct o2nm_node
*node
;
525 node
= o2nm_get_node_by_num(slot
->ds_node_num
);
529 spin_lock(&o2hb_live_lock
);
530 if (!list_empty(&slot
->ds_live_item
)) {
531 mlog(ML_HEARTBEAT
, "Shutdown, node %d leaves region\n",
534 list_del_init(&slot
->ds_live_item
);
536 if (list_empty(&o2hb_live_slots
[slot
->ds_node_num
])) {
537 clear_bit(slot
->ds_node_num
, o2hb_live_node_bitmap
);
539 o2hb_queue_node_event(&event
, O2HB_NODE_DOWN_CB
, node
,
543 spin_unlock(&o2hb_live_lock
);
545 o2hb_run_event_list(&event
);
550 static int o2hb_check_slot(struct o2hb_region
*reg
,
551 struct o2hb_disk_slot
*slot
)
553 int changed
= 0, gen_changed
= 0;
554 struct o2hb_node_event event
=
555 { .hn_item
= LIST_HEAD_INIT(event
.hn_item
), };
556 struct o2nm_node
*node
;
557 struct o2hb_disk_heartbeat_block
*hb_block
= reg
->hr_tmp_block
;
559 unsigned int dead_ms
= o2hb_dead_threshold
* O2HB_REGION_TIMEOUT_MS
;
560 unsigned int slot_dead_ms
;
562 memcpy(hb_block
, slot
->ds_raw_block
, reg
->hr_block_bytes
);
564 /* Is this correct? Do we assume that the node doesn't exist
565 * if we're not configured for him? */
566 node
= o2nm_get_node_by_num(slot
->ds_node_num
);
570 if (!o2hb_verify_crc(reg
, hb_block
)) {
571 /* all paths from here will drop o2hb_live_lock for
573 spin_lock(&o2hb_live_lock
);
575 /* Don't print an error on the console in this case -
576 * a freshly formatted heartbeat area will not have a
578 if (list_empty(&slot
->ds_live_item
))
581 /* The node is live but pushed out a bad crc. We
582 * consider it a transient miss but don't populate any
583 * other values as they may be junk. */
584 mlog(ML_ERROR
, "Node %d has written a bad crc to %s\n",
585 slot
->ds_node_num
, reg
->hr_dev_name
);
586 o2hb_dump_slot(hb_block
);
588 slot
->ds_equal_samples
++;
592 /* we don't care if these wrap.. the state transitions below
593 * clear at the right places */
594 cputime
= le64_to_cpu(hb_block
->hb_seq
);
595 if (slot
->ds_last_time
!= cputime
)
596 slot
->ds_changed_samples
++;
598 slot
->ds_equal_samples
++;
599 slot
->ds_last_time
= cputime
;
601 /* The node changed heartbeat generations. We assume this to
602 * mean it dropped off but came back before we timed out. We
603 * want to consider it down for the time being but don't want
604 * to lose any changed_samples state we might build up to
605 * considering it live again. */
606 if (slot
->ds_last_generation
!= le64_to_cpu(hb_block
->hb_generation
)) {
608 slot
->ds_equal_samples
= 0;
609 mlog(ML_HEARTBEAT
, "Node %d changed generation (0x%llx "
610 "to 0x%llx)\n", slot
->ds_node_num
,
611 (long long)slot
->ds_last_generation
,
612 (long long)le64_to_cpu(hb_block
->hb_generation
));
615 slot
->ds_last_generation
= le64_to_cpu(hb_block
->hb_generation
);
617 mlog(ML_HEARTBEAT
, "Slot %d gen 0x%llx cksum 0x%x "
618 "seq %llu last %llu changed %u equal %u\n",
619 slot
->ds_node_num
, (long long)slot
->ds_last_generation
,
620 le32_to_cpu(hb_block
->hb_cksum
),
621 (unsigned long long)le64_to_cpu(hb_block
->hb_seq
),
622 (unsigned long long)slot
->ds_last_time
, slot
->ds_changed_samples
,
623 slot
->ds_equal_samples
);
625 spin_lock(&o2hb_live_lock
);
628 /* dead nodes only come to life after some number of
629 * changes at any time during their dead time */
630 if (list_empty(&slot
->ds_live_item
) &&
631 slot
->ds_changed_samples
>= O2HB_LIVE_THRESHOLD
) {
632 mlog(ML_HEARTBEAT
, "Node %d (id 0x%llx) joined my region\n",
633 slot
->ds_node_num
, (long long)slot
->ds_last_generation
);
635 /* first on the list generates a callback */
636 if (list_empty(&o2hb_live_slots
[slot
->ds_node_num
])) {
637 set_bit(slot
->ds_node_num
, o2hb_live_node_bitmap
);
639 o2hb_queue_node_event(&event
, O2HB_NODE_UP_CB
, node
,
645 list_add_tail(&slot
->ds_live_item
,
646 &o2hb_live_slots
[slot
->ds_node_num
]);
648 slot
->ds_equal_samples
= 0;
650 /* We want to be sure that all nodes agree on the
651 * number of milliseconds before a node will be
652 * considered dead. The self-fencing timeout is
653 * computed from this value, and a discrepancy might
654 * result in heartbeat calling a node dead when it
655 * hasn't self-fenced yet. */
656 slot_dead_ms
= le32_to_cpu(hb_block
->hb_dead_ms
);
657 if (slot_dead_ms
&& slot_dead_ms
!= dead_ms
) {
658 /* TODO: Perhaps we can fail the region here. */
659 mlog(ML_ERROR
, "Node %d on device %s has a dead count "
660 "of %u ms, but our count is %u ms.\n"
661 "Please double check your configuration values "
662 "for 'O2CB_HEARTBEAT_THRESHOLD'\n",
663 slot
->ds_node_num
, reg
->hr_dev_name
, slot_dead_ms
,
669 /* if the list is dead, we're done.. */
670 if (list_empty(&slot
->ds_live_item
))
673 /* live nodes only go dead after enough consequtive missed
674 * samples.. reset the missed counter whenever we see
676 if (slot
->ds_equal_samples
>= o2hb_dead_threshold
|| gen_changed
) {
677 mlog(ML_HEARTBEAT
, "Node %d left my region\n",
680 /* last off the live_slot generates a callback */
681 list_del_init(&slot
->ds_live_item
);
682 if (list_empty(&o2hb_live_slots
[slot
->ds_node_num
])) {
683 clear_bit(slot
->ds_node_num
, o2hb_live_node_bitmap
);
685 o2hb_queue_node_event(&event
, O2HB_NODE_DOWN_CB
, node
,
691 /* We don't clear this because the node is still
692 * actually writing new blocks. */
694 slot
->ds_changed_samples
= 0;
697 if (slot
->ds_changed_samples
) {
698 slot
->ds_changed_samples
= 0;
699 slot
->ds_equal_samples
= 0;
702 spin_unlock(&o2hb_live_lock
);
704 o2hb_run_event_list(&event
);
710 /* This could be faster if we just implmented a find_last_bit, but I
711 * don't think the circumstances warrant it. */
712 static int o2hb_highest_node(unsigned long *nodes
,
719 while ((node
= find_next_bit(nodes
, numbits
, node
+ 1)) != -1) {
729 static int o2hb_do_disk_heartbeat(struct o2hb_region
*reg
)
731 int i
, ret
, highest_node
, change
= 0;
732 unsigned long configured_nodes
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
733 struct o2hb_bio_wait_ctxt write_wc
;
735 ret
= o2nm_configured_node_map(configured_nodes
,
736 sizeof(configured_nodes
));
742 highest_node
= o2hb_highest_node(configured_nodes
, O2NM_MAX_NODES
);
743 if (highest_node
>= O2NM_MAX_NODES
) {
744 mlog(ML_NOTICE
, "ocfs2_heartbeat: no configured nodes found!\n");
748 /* No sense in reading the slots of nodes that don't exist
749 * yet. Of course, if the node definitions have holes in them
750 * then we're reading an empty slot anyway... Consider this
752 ret
= o2hb_read_slots(reg
, highest_node
+ 1);
758 /* With an up to date view of the slots, we can check that no
759 * other node has been improperly configured to heartbeat in
761 if (!o2hb_check_last_timestamp(reg
))
762 mlog(ML_ERROR
, "Device \"%s\": another node is heartbeating "
763 "in our slot!\n", reg
->hr_dev_name
);
765 /* fill in the proper info for our next heartbeat */
766 o2hb_prepare_block(reg
, reg
->hr_generation
);
768 /* And fire off the write. Note that we don't wait on this I/O
770 ret
= o2hb_issue_node_write(reg
, &write_wc
);
777 while((i
= find_next_bit(configured_nodes
, O2NM_MAX_NODES
, i
+ 1)) < O2NM_MAX_NODES
) {
779 change
|= o2hb_check_slot(reg
, ®
->hr_slots
[i
]);
783 * We have to be sure we've advertised ourselves on disk
784 * before we can go to steady state. This ensures that
785 * people we find in our steady state have seen us.
787 o2hb_wait_on_io(reg
, &write_wc
);
788 if (write_wc
.wc_error
) {
789 /* Do not re-arm the write timeout on I/O error - we
790 * can't be sure that the new block ever made it to
792 mlog(ML_ERROR
, "Write error %d on device \"%s\"\n",
793 write_wc
.wc_error
, reg
->hr_dev_name
);
794 return write_wc
.wc_error
;
797 o2hb_arm_write_timeout(reg
);
799 /* let the person who launched us know when things are steady */
800 if (!change
&& (atomic_read(®
->hr_steady_iterations
) != 0)) {
801 if (atomic_dec_and_test(®
->hr_steady_iterations
))
802 wake_up(&o2hb_steady_queue
);
808 /* Subtract b from a, storing the result in a. a *must* have a larger
810 static void o2hb_tv_subtract(struct timeval
*a
,
813 /* just return 0 when a is after b */
814 if (a
->tv_sec
< b
->tv_sec
||
815 (a
->tv_sec
== b
->tv_sec
&& a
->tv_usec
< b
->tv_usec
)) {
821 a
->tv_sec
-= b
->tv_sec
;
822 a
->tv_usec
-= b
->tv_usec
;
823 while ( a
->tv_usec
< 0 ) {
825 a
->tv_usec
+= 1000000;
829 static unsigned int o2hb_elapsed_msecs(struct timeval
*start
,
832 struct timeval res
= *end
;
834 o2hb_tv_subtract(&res
, start
);
836 return res
.tv_sec
* 1000 + res
.tv_usec
/ 1000;
840 * we ride the region ref that the region dir holds. before the region
841 * dir is removed and drops it ref it will wait to tear down this
844 static int o2hb_thread(void *data
)
847 struct o2hb_region
*reg
= data
;
848 struct o2hb_bio_wait_ctxt write_wc
;
849 struct timeval before_hb
, after_hb
;
850 unsigned int elapsed_msec
;
852 mlog(ML_HEARTBEAT
|ML_KTHREAD
, "hb thread running\n");
854 set_user_nice(current
, -20);
856 while (!kthread_should_stop() && !reg
->hr_unclean_stop
) {
857 /* We track the time spent inside
858 * o2hb_do_disk_heartbeat so that we avoid more then
859 * hr_timeout_ms between disk writes. On busy systems
860 * this should result in a heartbeat which is less
861 * likely to time itself out. */
862 do_gettimeofday(&before_hb
);
866 ret
= o2hb_do_disk_heartbeat(reg
);
867 } while (ret
&& ++i
< 2);
869 do_gettimeofday(&after_hb
);
870 elapsed_msec
= o2hb_elapsed_msecs(&before_hb
, &after_hb
);
872 mlog(0, "start = %lu.%lu, end = %lu.%lu, msec = %u\n",
873 before_hb
.tv_sec
, (unsigned long) before_hb
.tv_usec
,
874 after_hb
.tv_sec
, (unsigned long) after_hb
.tv_usec
,
877 if (elapsed_msec
< reg
->hr_timeout_ms
) {
878 /* the kthread api has blocked signals for us so no
879 * need to record the return value. */
880 msleep_interruptible(reg
->hr_timeout_ms
- elapsed_msec
);
884 o2hb_disarm_write_timeout(reg
);
886 /* unclean stop is only used in very bad situation */
887 for(i
= 0; !reg
->hr_unclean_stop
&& i
< reg
->hr_blocks
; i
++)
888 o2hb_shutdown_slot(®
->hr_slots
[i
]);
890 /* Explicit down notification - avoid forcing the other nodes
891 * to timeout on this region when we could just as easily
892 * write a clear generation - thus indicating to them that
893 * this node has left this region.
895 * XXX: Should we skip this on unclean_stop? */
896 o2hb_prepare_block(reg
, 0);
897 ret
= o2hb_issue_node_write(reg
, &write_wc
);
899 o2hb_wait_on_io(reg
, &write_wc
);
904 mlog(ML_HEARTBEAT
|ML_KTHREAD
, "hb thread exiting\n");
913 for (i
= 0; i
< ARRAY_SIZE(o2hb_callbacks
); i
++)
914 INIT_LIST_HEAD(&o2hb_callbacks
[i
].list
);
916 for (i
= 0; i
< ARRAY_SIZE(o2hb_live_slots
); i
++)
917 INIT_LIST_HEAD(&o2hb_live_slots
[i
]);
919 INIT_LIST_HEAD(&o2hb_node_events
);
921 memset(o2hb_live_node_bitmap
, 0, sizeof(o2hb_live_node_bitmap
));
924 /* if we're already in a callback then we're already serialized by the sem */
925 static void o2hb_fill_node_map_from_callback(unsigned long *map
,
928 BUG_ON(bytes
< (BITS_TO_LONGS(O2NM_MAX_NODES
) * sizeof(unsigned long)));
930 memcpy(map
, &o2hb_live_node_bitmap
, bytes
);
934 * get a map of all nodes that are heartbeating in any regions
936 void o2hb_fill_node_map(unsigned long *map
, unsigned bytes
)
938 /* callers want to serialize this map and callbacks so that they
939 * can trust that they don't miss nodes coming to the party */
940 down_read(&o2hb_callback_sem
);
941 spin_lock(&o2hb_live_lock
);
942 o2hb_fill_node_map_from_callback(map
, bytes
);
943 spin_unlock(&o2hb_live_lock
);
944 up_read(&o2hb_callback_sem
);
946 EXPORT_SYMBOL_GPL(o2hb_fill_node_map
);
949 * heartbeat configfs bits. The heartbeat set is a default set under
950 * the cluster set in nodemanager.c.
953 static struct o2hb_region
*to_o2hb_region(struct config_item
*item
)
955 return item
? container_of(item
, struct o2hb_region
, hr_item
) : NULL
;
958 /* drop_item only drops its ref after killing the thread, nothing should
959 * be using the region anymore. this has to clean up any state that
960 * attributes might have built up. */
961 static void o2hb_region_release(struct config_item
*item
)
965 struct o2hb_region
*reg
= to_o2hb_region(item
);
967 if (reg
->hr_tmp_block
)
968 kfree(reg
->hr_tmp_block
);
970 if (reg
->hr_slot_data
) {
971 for (i
= 0; i
< reg
->hr_num_pages
; i
++) {
972 page
= reg
->hr_slot_data
[i
];
976 kfree(reg
->hr_slot_data
);
980 blkdev_put(reg
->hr_bdev
);
983 kfree(reg
->hr_slots
);
985 spin_lock(&o2hb_live_lock
);
986 list_del(®
->hr_all_item
);
987 spin_unlock(&o2hb_live_lock
);
992 static int o2hb_read_block_input(struct o2hb_region
*reg
,
995 unsigned long *ret_bytes
,
996 unsigned int *ret_bits
)
999 char *p
= (char *)page
;
1001 bytes
= simple_strtoul(p
, &p
, 0);
1002 if (!p
|| (*p
&& (*p
!= '\n')))
1005 /* Heartbeat and fs min / max block sizes are the same. */
1006 if (bytes
> 4096 || bytes
< 512)
1008 if (hweight16(bytes
) != 1)
1014 *ret_bits
= ffs(bytes
) - 1;
1019 static ssize_t
o2hb_region_block_bytes_read(struct o2hb_region
*reg
,
1022 return sprintf(page
, "%u\n", reg
->hr_block_bytes
);
1025 static ssize_t
o2hb_region_block_bytes_write(struct o2hb_region
*reg
,
1030 unsigned long block_bytes
;
1031 unsigned int block_bits
;
1036 status
= o2hb_read_block_input(reg
, page
, count
,
1037 &block_bytes
, &block_bits
);
1041 reg
->hr_block_bytes
= (unsigned int)block_bytes
;
1042 reg
->hr_block_bits
= block_bits
;
1047 static ssize_t
o2hb_region_start_block_read(struct o2hb_region
*reg
,
1050 return sprintf(page
, "%llu\n", reg
->hr_start_block
);
1053 static ssize_t
o2hb_region_start_block_write(struct o2hb_region
*reg
,
1057 unsigned long long tmp
;
1058 char *p
= (char *)page
;
1063 tmp
= simple_strtoull(p
, &p
, 0);
1064 if (!p
|| (*p
&& (*p
!= '\n')))
1067 reg
->hr_start_block
= tmp
;
1072 static ssize_t
o2hb_region_blocks_read(struct o2hb_region
*reg
,
1075 return sprintf(page
, "%d\n", reg
->hr_blocks
);
1078 static ssize_t
o2hb_region_blocks_write(struct o2hb_region
*reg
,
1083 char *p
= (char *)page
;
1088 tmp
= simple_strtoul(p
, &p
, 0);
1089 if (!p
|| (*p
&& (*p
!= '\n')))
1092 if (tmp
> O2NM_MAX_NODES
|| tmp
== 0)
1095 reg
->hr_blocks
= (unsigned int)tmp
;
1100 static ssize_t
o2hb_region_dev_read(struct o2hb_region
*reg
,
1103 unsigned int ret
= 0;
1106 ret
= sprintf(page
, "%s\n", reg
->hr_dev_name
);
1111 static void o2hb_init_region_params(struct o2hb_region
*reg
)
1113 reg
->hr_slots_per_page
= PAGE_CACHE_SIZE
>> reg
->hr_block_bits
;
1114 reg
->hr_timeout_ms
= O2HB_REGION_TIMEOUT_MS
;
1116 mlog(ML_HEARTBEAT
, "hr_start_block = %llu, hr_blocks = %u\n",
1117 reg
->hr_start_block
, reg
->hr_blocks
);
1118 mlog(ML_HEARTBEAT
, "hr_block_bytes = %u, hr_block_bits = %u\n",
1119 reg
->hr_block_bytes
, reg
->hr_block_bits
);
1120 mlog(ML_HEARTBEAT
, "hr_timeout_ms = %u\n", reg
->hr_timeout_ms
);
1121 mlog(ML_HEARTBEAT
, "dead threshold = %u\n", o2hb_dead_threshold
);
1124 static int o2hb_map_slot_data(struct o2hb_region
*reg
)
1127 unsigned int last_slot
;
1128 unsigned int spp
= reg
->hr_slots_per_page
;
1131 struct o2hb_disk_slot
*slot
;
1133 reg
->hr_tmp_block
= kmalloc(reg
->hr_block_bytes
, GFP_KERNEL
);
1134 if (reg
->hr_tmp_block
== NULL
) {
1135 mlog_errno(-ENOMEM
);
1139 reg
->hr_slots
= kcalloc(reg
->hr_blocks
,
1140 sizeof(struct o2hb_disk_slot
), GFP_KERNEL
);
1141 if (reg
->hr_slots
== NULL
) {
1142 mlog_errno(-ENOMEM
);
1146 for(i
= 0; i
< reg
->hr_blocks
; i
++) {
1147 slot
= ®
->hr_slots
[i
];
1148 slot
->ds_node_num
= i
;
1149 INIT_LIST_HEAD(&slot
->ds_live_item
);
1150 slot
->ds_raw_block
= NULL
;
1153 reg
->hr_num_pages
= (reg
->hr_blocks
+ spp
- 1) / spp
;
1154 mlog(ML_HEARTBEAT
, "Going to require %u pages to cover %u blocks "
1155 "at %u blocks per page\n",
1156 reg
->hr_num_pages
, reg
->hr_blocks
, spp
);
1158 reg
->hr_slot_data
= kcalloc(reg
->hr_num_pages
, sizeof(struct page
*),
1160 if (!reg
->hr_slot_data
) {
1161 mlog_errno(-ENOMEM
);
1165 for(i
= 0; i
< reg
->hr_num_pages
; i
++) {
1166 page
= alloc_page(GFP_KERNEL
);
1168 mlog_errno(-ENOMEM
);
1172 reg
->hr_slot_data
[i
] = page
;
1174 last_slot
= i
* spp
;
1175 raw
= page_address(page
);
1177 (j
< spp
) && ((j
+ last_slot
) < reg
->hr_blocks
);
1179 BUG_ON((j
+ last_slot
) >= reg
->hr_blocks
);
1181 slot
= ®
->hr_slots
[j
+ last_slot
];
1182 slot
->ds_raw_block
=
1183 (struct o2hb_disk_heartbeat_block
*) raw
;
1185 raw
+= reg
->hr_block_bytes
;
1192 /* Read in all the slots available and populate the tracking
1193 * structures so that we can start with a baseline idea of what's
1195 static int o2hb_populate_slot_data(struct o2hb_region
*reg
)
1198 struct o2hb_disk_slot
*slot
;
1199 struct o2hb_disk_heartbeat_block
*hb_block
;
1203 ret
= o2hb_read_slots(reg
, reg
->hr_blocks
);
1209 /* We only want to get an idea of the values initially in each
1210 * slot, so we do no verification - o2hb_check_slot will
1211 * actually determine if each configured slot is valid and
1212 * whether any values have changed. */
1213 for(i
= 0; i
< reg
->hr_blocks
; i
++) {
1214 slot
= ®
->hr_slots
[i
];
1215 hb_block
= (struct o2hb_disk_heartbeat_block
*) slot
->ds_raw_block
;
1217 /* Only fill the values that o2hb_check_slot uses to
1218 * determine changing slots */
1219 slot
->ds_last_time
= le64_to_cpu(hb_block
->hb_seq
);
1220 slot
->ds_last_generation
= le64_to_cpu(hb_block
->hb_generation
);
1228 /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */
1229 static ssize_t
o2hb_region_dev_write(struct o2hb_region
*reg
,
1233 struct task_struct
*hb_task
;
1236 char *p
= (char *)page
;
1237 struct file
*filp
= NULL
;
1238 struct inode
*inode
= NULL
;
1239 ssize_t ret
= -EINVAL
;
1244 /* We can't heartbeat without having had our node number
1245 * configured yet. */
1246 if (o2nm_this_node() == O2NM_MAX_NODES
)
1249 fd
= simple_strtol(p
, &p
, 0);
1250 if (!p
|| (*p
&& (*p
!= '\n')))
1253 if (fd
< 0 || fd
>= INT_MAX
)
1260 if (reg
->hr_blocks
== 0 || reg
->hr_start_block
== 0 ||
1261 reg
->hr_block_bytes
== 0)
1264 inode
= igrab(filp
->f_mapping
->host
);
1268 if (!S_ISBLK(inode
->i_mode
))
1271 reg
->hr_bdev
= I_BDEV(filp
->f_mapping
->host
);
1272 ret
= blkdev_get(reg
->hr_bdev
, FMODE_WRITE
| FMODE_READ
, 0);
1274 reg
->hr_bdev
= NULL
;
1279 bdevname(reg
->hr_bdev
, reg
->hr_dev_name
);
1281 sectsize
= bdev_hardsect_size(reg
->hr_bdev
);
1282 if (sectsize
!= reg
->hr_block_bytes
) {
1284 "blocksize %u incorrect for device, expected %d",
1285 reg
->hr_block_bytes
, sectsize
);
1290 o2hb_init_region_params(reg
);
1292 /* Generation of zero is invalid */
1294 get_random_bytes(®
->hr_generation
,
1295 sizeof(reg
->hr_generation
));
1296 } while (reg
->hr_generation
== 0);
1298 ret
= o2hb_map_slot_data(reg
);
1304 ret
= o2hb_populate_slot_data(reg
);
1310 INIT_DELAYED_WORK(®
->hr_write_timeout_work
, o2hb_write_timeout
);
1313 * A node is considered live after it has beat LIVE_THRESHOLD
1314 * times. We're not steady until we've given them a chance
1315 * _after_ our first read.
1317 atomic_set(®
->hr_steady_iterations
, O2HB_LIVE_THRESHOLD
+ 1);
1319 hb_task
= kthread_run(o2hb_thread
, reg
, "o2hb-%s",
1320 reg
->hr_item
.ci_name
);
1321 if (IS_ERR(hb_task
)) {
1322 ret
= PTR_ERR(hb_task
);
1327 spin_lock(&o2hb_live_lock
);
1328 reg
->hr_task
= hb_task
;
1329 spin_unlock(&o2hb_live_lock
);
1331 ret
= wait_event_interruptible(o2hb_steady_queue
,
1332 atomic_read(®
->hr_steady_iterations
) == 0);
1334 /* We got interrupted (hello ptrace!). Clean up */
1335 spin_lock(&o2hb_live_lock
);
1336 hb_task
= reg
->hr_task
;
1337 reg
->hr_task
= NULL
;
1338 spin_unlock(&o2hb_live_lock
);
1341 kthread_stop(hb_task
);
1345 /* Ok, we were woken. Make sure it wasn't by drop_item() */
1346 spin_lock(&o2hb_live_lock
);
1347 hb_task
= reg
->hr_task
;
1348 spin_unlock(&o2hb_live_lock
);
1362 blkdev_put(reg
->hr_bdev
);
1363 reg
->hr_bdev
= NULL
;
1369 static ssize_t
o2hb_region_pid_read(struct o2hb_region
*reg
,
1374 spin_lock(&o2hb_live_lock
);
1376 pid
= reg
->hr_task
->pid
;
1377 spin_unlock(&o2hb_live_lock
);
1382 return sprintf(page
, "%u\n", pid
);
1385 struct o2hb_region_attribute
{
1386 struct configfs_attribute attr
;
1387 ssize_t (*show
)(struct o2hb_region
*, char *);
1388 ssize_t (*store
)(struct o2hb_region
*, const char *, size_t);
1391 static struct o2hb_region_attribute o2hb_region_attr_block_bytes
= {
1392 .attr
= { .ca_owner
= THIS_MODULE
,
1393 .ca_name
= "block_bytes",
1394 .ca_mode
= S_IRUGO
| S_IWUSR
},
1395 .show
= o2hb_region_block_bytes_read
,
1396 .store
= o2hb_region_block_bytes_write
,
1399 static struct o2hb_region_attribute o2hb_region_attr_start_block
= {
1400 .attr
= { .ca_owner
= THIS_MODULE
,
1401 .ca_name
= "start_block",
1402 .ca_mode
= S_IRUGO
| S_IWUSR
},
1403 .show
= o2hb_region_start_block_read
,
1404 .store
= o2hb_region_start_block_write
,
1407 static struct o2hb_region_attribute o2hb_region_attr_blocks
= {
1408 .attr
= { .ca_owner
= THIS_MODULE
,
1409 .ca_name
= "blocks",
1410 .ca_mode
= S_IRUGO
| S_IWUSR
},
1411 .show
= o2hb_region_blocks_read
,
1412 .store
= o2hb_region_blocks_write
,
1415 static struct o2hb_region_attribute o2hb_region_attr_dev
= {
1416 .attr
= { .ca_owner
= THIS_MODULE
,
1418 .ca_mode
= S_IRUGO
| S_IWUSR
},
1419 .show
= o2hb_region_dev_read
,
1420 .store
= o2hb_region_dev_write
,
1423 static struct o2hb_region_attribute o2hb_region_attr_pid
= {
1424 .attr
= { .ca_owner
= THIS_MODULE
,
1426 .ca_mode
= S_IRUGO
| S_IRUSR
},
1427 .show
= o2hb_region_pid_read
,
1430 static struct configfs_attribute
*o2hb_region_attrs
[] = {
1431 &o2hb_region_attr_block_bytes
.attr
,
1432 &o2hb_region_attr_start_block
.attr
,
1433 &o2hb_region_attr_blocks
.attr
,
1434 &o2hb_region_attr_dev
.attr
,
1435 &o2hb_region_attr_pid
.attr
,
1439 static ssize_t
o2hb_region_show(struct config_item
*item
,
1440 struct configfs_attribute
*attr
,
1443 struct o2hb_region
*reg
= to_o2hb_region(item
);
1444 struct o2hb_region_attribute
*o2hb_region_attr
=
1445 container_of(attr
, struct o2hb_region_attribute
, attr
);
1448 if (o2hb_region_attr
->show
)
1449 ret
= o2hb_region_attr
->show(reg
, page
);
1453 static ssize_t
o2hb_region_store(struct config_item
*item
,
1454 struct configfs_attribute
*attr
,
1455 const char *page
, size_t count
)
1457 struct o2hb_region
*reg
= to_o2hb_region(item
);
1458 struct o2hb_region_attribute
*o2hb_region_attr
=
1459 container_of(attr
, struct o2hb_region_attribute
, attr
);
1460 ssize_t ret
= -EINVAL
;
1462 if (o2hb_region_attr
->store
)
1463 ret
= o2hb_region_attr
->store(reg
, page
, count
);
1467 static struct configfs_item_operations o2hb_region_item_ops
= {
1468 .release
= o2hb_region_release
,
1469 .show_attribute
= o2hb_region_show
,
1470 .store_attribute
= o2hb_region_store
,
1473 static struct config_item_type o2hb_region_type
= {
1474 .ct_item_ops
= &o2hb_region_item_ops
,
1475 .ct_attrs
= o2hb_region_attrs
,
1476 .ct_owner
= THIS_MODULE
,
1481 struct o2hb_heartbeat_group
{
1482 struct config_group hs_group
;
1486 static struct o2hb_heartbeat_group
*to_o2hb_heartbeat_group(struct config_group
*group
)
1489 container_of(group
, struct o2hb_heartbeat_group
, hs_group
)
1493 static struct config_item
*o2hb_heartbeat_group_make_item(struct config_group
*group
,
1496 struct o2hb_region
*reg
= NULL
;
1497 struct config_item
*ret
= NULL
;
1499 reg
= kzalloc(sizeof(struct o2hb_region
), GFP_KERNEL
);
1501 goto out
; /* ENOMEM */
1503 config_item_init_type_name(®
->hr_item
, name
, &o2hb_region_type
);
1505 ret
= ®
->hr_item
;
1507 spin_lock(&o2hb_live_lock
);
1508 list_add_tail(®
->hr_all_item
, &o2hb_all_regions
);
1509 spin_unlock(&o2hb_live_lock
);
1517 static void o2hb_heartbeat_group_drop_item(struct config_group
*group
,
1518 struct config_item
*item
)
1520 struct task_struct
*hb_task
;
1521 struct o2hb_region
*reg
= to_o2hb_region(item
);
1523 /* stop the thread when the user removes the region dir */
1524 spin_lock(&o2hb_live_lock
);
1525 hb_task
= reg
->hr_task
;
1526 reg
->hr_task
= NULL
;
1527 spin_unlock(&o2hb_live_lock
);
1530 kthread_stop(hb_task
);
1533 * If we're racing a dev_write(), we need to wake them. They will
1534 * check reg->hr_task
1536 if (atomic_read(®
->hr_steady_iterations
) != 0) {
1537 atomic_set(®
->hr_steady_iterations
, 0);
1538 wake_up(&o2hb_steady_queue
);
1541 config_item_put(item
);
1544 struct o2hb_heartbeat_group_attribute
{
1545 struct configfs_attribute attr
;
1546 ssize_t (*show
)(struct o2hb_heartbeat_group
*, char *);
1547 ssize_t (*store
)(struct o2hb_heartbeat_group
*, const char *, size_t);
1550 static ssize_t
o2hb_heartbeat_group_show(struct config_item
*item
,
1551 struct configfs_attribute
*attr
,
1554 struct o2hb_heartbeat_group
*reg
= to_o2hb_heartbeat_group(to_config_group(item
));
1555 struct o2hb_heartbeat_group_attribute
*o2hb_heartbeat_group_attr
=
1556 container_of(attr
, struct o2hb_heartbeat_group_attribute
, attr
);
1559 if (o2hb_heartbeat_group_attr
->show
)
1560 ret
= o2hb_heartbeat_group_attr
->show(reg
, page
);
1564 static ssize_t
o2hb_heartbeat_group_store(struct config_item
*item
,
1565 struct configfs_attribute
*attr
,
1566 const char *page
, size_t count
)
1568 struct o2hb_heartbeat_group
*reg
= to_o2hb_heartbeat_group(to_config_group(item
));
1569 struct o2hb_heartbeat_group_attribute
*o2hb_heartbeat_group_attr
=
1570 container_of(attr
, struct o2hb_heartbeat_group_attribute
, attr
);
1571 ssize_t ret
= -EINVAL
;
1573 if (o2hb_heartbeat_group_attr
->store
)
1574 ret
= o2hb_heartbeat_group_attr
->store(reg
, page
, count
);
1578 static ssize_t
o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group
*group
,
1581 return sprintf(page
, "%u\n", o2hb_dead_threshold
);
1584 static ssize_t
o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group
*group
,
1589 char *p
= (char *)page
;
1591 tmp
= simple_strtoul(p
, &p
, 10);
1592 if (!p
|| (*p
&& (*p
!= '\n')))
1595 /* this will validate ranges for us. */
1596 o2hb_dead_threshold_set((unsigned int) tmp
);
1601 static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold
= {
1602 .attr
= { .ca_owner
= THIS_MODULE
,
1603 .ca_name
= "dead_threshold",
1604 .ca_mode
= S_IRUGO
| S_IWUSR
},
1605 .show
= o2hb_heartbeat_group_threshold_show
,
1606 .store
= o2hb_heartbeat_group_threshold_store
,
1609 static struct configfs_attribute
*o2hb_heartbeat_group_attrs
[] = {
1610 &o2hb_heartbeat_group_attr_threshold
.attr
,
1614 static struct configfs_item_operations o2hb_hearbeat_group_item_ops
= {
1615 .show_attribute
= o2hb_heartbeat_group_show
,
1616 .store_attribute
= o2hb_heartbeat_group_store
,
1619 static struct configfs_group_operations o2hb_heartbeat_group_group_ops
= {
1620 .make_item
= o2hb_heartbeat_group_make_item
,
1621 .drop_item
= o2hb_heartbeat_group_drop_item
,
1624 static struct config_item_type o2hb_heartbeat_group_type
= {
1625 .ct_group_ops
= &o2hb_heartbeat_group_group_ops
,
1626 .ct_item_ops
= &o2hb_hearbeat_group_item_ops
,
1627 .ct_attrs
= o2hb_heartbeat_group_attrs
,
1628 .ct_owner
= THIS_MODULE
,
1631 /* this is just here to avoid touching group in heartbeat.h which the
1632 * entire damn world #includes */
1633 struct config_group
*o2hb_alloc_hb_set(void)
1635 struct o2hb_heartbeat_group
*hs
= NULL
;
1636 struct config_group
*ret
= NULL
;
1638 hs
= kzalloc(sizeof(struct o2hb_heartbeat_group
), GFP_KERNEL
);
1642 config_group_init_type_name(&hs
->hs_group
, "heartbeat",
1643 &o2hb_heartbeat_group_type
);
1645 ret
= &hs
->hs_group
;
1652 void o2hb_free_hb_set(struct config_group
*group
)
1654 struct o2hb_heartbeat_group
*hs
= to_o2hb_heartbeat_group(group
);
1658 /* hb callback registration and issueing */
1660 static struct o2hb_callback
*hbcall_from_type(enum o2hb_callback_type type
)
1662 if (type
== O2HB_NUM_CB
)
1663 return ERR_PTR(-EINVAL
);
1665 return &o2hb_callbacks
[type
];
1668 void o2hb_setup_callback(struct o2hb_callback_func
*hc
,
1669 enum o2hb_callback_type type
,
1674 INIT_LIST_HEAD(&hc
->hc_item
);
1677 hc
->hc_priority
= priority
;
1679 hc
->hc_magic
= O2HB_CB_MAGIC
;
1681 EXPORT_SYMBOL_GPL(o2hb_setup_callback
);
1683 static struct o2hb_region
*o2hb_find_region(const char *region_uuid
)
1685 struct o2hb_region
*p
, *reg
= NULL
;
1687 assert_spin_locked(&o2hb_live_lock
);
1689 list_for_each_entry(p
, &o2hb_all_regions
, hr_all_item
) {
1690 if (!strcmp(region_uuid
, config_item_name(&p
->hr_item
))) {
1699 static int o2hb_region_get(const char *region_uuid
)
1702 struct o2hb_region
*reg
;
1704 spin_lock(&o2hb_live_lock
);
1706 reg
= o2hb_find_region(region_uuid
);
1709 spin_unlock(&o2hb_live_lock
);
1714 ret
= o2nm_depend_this_node();
1718 ret
= o2nm_depend_item(®
->hr_item
);
1720 o2nm_undepend_this_node();
1726 static void o2hb_region_put(const char *region_uuid
)
1728 struct o2hb_region
*reg
;
1730 spin_lock(&o2hb_live_lock
);
1732 reg
= o2hb_find_region(region_uuid
);
1734 spin_unlock(&o2hb_live_lock
);
1737 o2nm_undepend_item(®
->hr_item
);
1738 o2nm_undepend_this_node();
1742 int o2hb_register_callback(const char *region_uuid
,
1743 struct o2hb_callback_func
*hc
)
1745 struct o2hb_callback_func
*tmp
;
1746 struct list_head
*iter
;
1747 struct o2hb_callback
*hbcall
;
1750 BUG_ON(hc
->hc_magic
!= O2HB_CB_MAGIC
);
1751 BUG_ON(!list_empty(&hc
->hc_item
));
1753 hbcall
= hbcall_from_type(hc
->hc_type
);
1754 if (IS_ERR(hbcall
)) {
1755 ret
= PTR_ERR(hbcall
);
1760 ret
= o2hb_region_get(region_uuid
);
1765 down_write(&o2hb_callback_sem
);
1767 list_for_each(iter
, &hbcall
->list
) {
1768 tmp
= list_entry(iter
, struct o2hb_callback_func
, hc_item
);
1769 if (hc
->hc_priority
< tmp
->hc_priority
) {
1770 list_add_tail(&hc
->hc_item
, iter
);
1774 if (list_empty(&hc
->hc_item
))
1775 list_add_tail(&hc
->hc_item
, &hbcall
->list
);
1777 up_write(&o2hb_callback_sem
);
1780 mlog(ML_HEARTBEAT
, "returning %d on behalf of %p for funcs %p\n",
1781 ret
, __builtin_return_address(0), hc
);
1784 EXPORT_SYMBOL_GPL(o2hb_register_callback
);
1786 void o2hb_unregister_callback(const char *region_uuid
,
1787 struct o2hb_callback_func
*hc
)
1789 BUG_ON(hc
->hc_magic
!= O2HB_CB_MAGIC
);
1791 mlog(ML_HEARTBEAT
, "on behalf of %p for funcs %p\n",
1792 __builtin_return_address(0), hc
);
1794 /* XXX Can this happen _with_ a region reference? */
1795 if (list_empty(&hc
->hc_item
))
1799 o2hb_region_put(region_uuid
);
1801 down_write(&o2hb_callback_sem
);
1803 list_del_init(&hc
->hc_item
);
1805 up_write(&o2hb_callback_sem
);
1807 EXPORT_SYMBOL_GPL(o2hb_unregister_callback
);
1809 int o2hb_check_node_heartbeating(u8 node_num
)
1811 unsigned long testing_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1813 o2hb_fill_node_map(testing_map
, sizeof(testing_map
));
1814 if (!test_bit(node_num
, testing_map
)) {
1816 "node (%u) does not have heartbeating enabled.\n",
1823 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating
);
1825 int o2hb_check_node_heartbeating_from_callback(u8 node_num
)
1827 unsigned long testing_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1829 o2hb_fill_node_map_from_callback(testing_map
, sizeof(testing_map
));
1830 if (!test_bit(node_num
, testing_map
)) {
1832 "node (%u) does not have heartbeating enabled.\n",
1839 EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback
);
1841 /* Makes sure our local node is configured with a node number, and is
1843 int o2hb_check_local_node_heartbeating(void)
1847 /* if this node was set then we have networking */
1848 node_num
= o2nm_this_node();
1849 if (node_num
== O2NM_MAX_NODES
) {
1850 mlog(ML_HEARTBEAT
, "this node has not been configured.\n");
1854 return o2hb_check_node_heartbeating(node_num
);
1856 EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating
);
1859 * this is just a hack until we get the plumbing which flips file systems
1860 * read only and drops the hb ref instead of killing the node dead.
1862 void o2hb_stop_all_regions(void)
1864 struct o2hb_region
*reg
;
1866 mlog(ML_ERROR
, "stopping heartbeat on all active regions.\n");
1868 spin_lock(&o2hb_live_lock
);
1870 list_for_each_entry(reg
, &o2hb_all_regions
, hr_all_item
)
1871 reg
->hr_unclean_stop
= 1;
1873 spin_unlock(&o2hb_live_lock
);
1875 EXPORT_SYMBOL_GPL(o2hb_stop_all_regions
);