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a7f6a5fb MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * Copyright (C) 2004, 2005 Oracle. All rights reserved. | |
5 | * | |
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. | |
10 | * | |
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. | |
15 | * | |
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. | |
20 | */ | |
21 | ||
22 | #include <linux/kernel.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/jiffies.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/fs.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 | ||
37 | #include "heartbeat.h" | |
38 | #include "tcp.h" | |
39 | #include "nodemanager.h" | |
40 | #include "quorum.h" | |
41 | ||
42 | #include "masklog.h" | |
43 | ||
44 | ||
45 | /* | |
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. | |
50 | */ | |
51 | static DECLARE_RWSEM(o2hb_callback_sem); | |
52 | ||
53 | /* | |
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. | |
56 | */ | |
34af946a | 57 | static DEFINE_SPINLOCK(o2hb_live_lock); |
a7f6a5fb MF |
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); | |
62 | ||
63 | static LIST_HEAD(o2hb_all_regions); | |
64 | ||
65 | static struct o2hb_callback { | |
66 | struct list_head list; | |
67 | } o2hb_callbacks[O2HB_NUM_CB]; | |
68 | ||
69 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type); | |
70 | ||
71 | #define O2HB_DEFAULT_BLOCK_BITS 9 | |
72 | ||
73 | unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD; | |
74 | ||
75 | /* Only sets a new threshold if there are no active regions. | |
76 | * | |
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) | |
81 | { | |
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); | |
87 | } | |
88 | } | |
89 | ||
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; | |
94 | int hn_node_num; | |
95 | }; | |
96 | ||
97 | struct o2hb_disk_slot { | |
98 | struct o2hb_disk_heartbeat_block *ds_raw_block; | |
99 | u8 ds_node_num; | |
100 | u64 ds_last_time; | |
101 | u64 ds_last_generation; | |
102 | u16 ds_equal_samples; | |
103 | u16 ds_changed_samples; | |
104 | struct list_head ds_live_item; | |
105 | }; | |
106 | ||
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 */ | |
109 | struct o2hb_region { | |
110 | struct config_item hr_item; | |
111 | ||
112 | struct list_head hr_all_item; | |
113 | unsigned hr_unclean_stop:1; | |
114 | ||
115 | /* protected by the hr_callback_sem */ | |
116 | struct task_struct *hr_task; | |
117 | ||
118 | unsigned int hr_blocks; | |
119 | unsigned long long hr_start_block; | |
120 | ||
121 | unsigned int hr_block_bits; | |
122 | unsigned int hr_block_bytes; | |
123 | ||
124 | unsigned int hr_slots_per_page; | |
125 | unsigned int hr_num_pages; | |
126 | ||
127 | struct page **hr_slot_data; | |
128 | struct block_device *hr_bdev; | |
129 | struct o2hb_disk_slot *hr_slots; | |
130 | ||
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; | |
135 | ||
136 | char hr_dev_name[BDEVNAME_SIZE]; | |
137 | ||
138 | unsigned int hr_timeout_ms; | |
139 | ||
140 | /* randomized as the region goes up and down so that a node | |
141 | * recognizes a node going up and down in one iteration */ | |
142 | u64 hr_generation; | |
143 | ||
c4028958 | 144 | struct delayed_work hr_write_timeout_work; |
a7f6a5fb MF |
145 | unsigned long hr_last_timeout_start; |
146 | ||
147 | /* Used during o2hb_check_slot to hold a copy of the block | |
148 | * being checked because we temporarily have to zero out the | |
149 | * crc field. */ | |
150 | struct o2hb_disk_heartbeat_block *hr_tmp_block; | |
151 | }; | |
152 | ||
153 | struct o2hb_bio_wait_ctxt { | |
154 | atomic_t wc_num_reqs; | |
155 | struct completion wc_io_complete; | |
a9e2ae39 | 156 | int wc_error; |
a7f6a5fb MF |
157 | }; |
158 | ||
c4028958 | 159 | static void o2hb_write_timeout(struct work_struct *work) |
a7f6a5fb | 160 | { |
c4028958 DH |
161 | struct o2hb_region *reg = |
162 | container_of(work, struct o2hb_region, | |
163 | hr_write_timeout_work.work); | |
a7f6a5fb MF |
164 | |
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(); | |
169 | } | |
170 | ||
171 | static void o2hb_arm_write_timeout(struct o2hb_region *reg) | |
172 | { | |
173 | mlog(0, "Queue write timeout for %u ms\n", O2HB_MAX_WRITE_TIMEOUT_MS); | |
174 | ||
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)); | |
179 | } | |
180 | ||
181 | static void o2hb_disarm_write_timeout(struct o2hb_region *reg) | |
182 | { | |
183 | cancel_delayed_work(®->hr_write_timeout_work); | |
184 | flush_scheduled_work(); | |
185 | } | |
186 | ||
b559292e | 187 | static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc) |
a7f6a5fb | 188 | { |
b559292e | 189 | atomic_set(&wc->wc_num_reqs, 1); |
a7f6a5fb | 190 | init_completion(&wc->wc_io_complete); |
a9e2ae39 | 191 | wc->wc_error = 0; |
a7f6a5fb MF |
192 | } |
193 | ||
194 | /* Used in error paths too */ | |
195 | static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc, | |
196 | unsigned int num) | |
197 | { | |
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 */ | |
200 | while(num--) { | |
201 | if (atomic_dec_and_test(&wc->wc_num_reqs)) { | |
202 | BUG_ON(num > 0); | |
203 | complete(&wc->wc_io_complete); | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
208 | static void o2hb_wait_on_io(struct o2hb_region *reg, | |
209 | struct o2hb_bio_wait_ctxt *wc) | |
210 | { | |
211 | struct address_space *mapping = reg->hr_bdev->bd_inode->i_mapping; | |
212 | ||
213 | blk_run_address_space(mapping); | |
b559292e | 214 | o2hb_bio_wait_dec(wc, 1); |
a7f6a5fb MF |
215 | |
216 | wait_for_completion(&wc->wc_io_complete); | |
217 | } | |
218 | ||
782e3b3b | 219 | static void o2hb_bio_end_io(struct bio *bio, |
a7f6a5fb MF |
220 | int error) |
221 | { | |
222 | struct o2hb_bio_wait_ctxt *wc = bio->bi_private; | |
223 | ||
a9e2ae39 | 224 | if (error) { |
a7f6a5fb | 225 | mlog(ML_ERROR, "IO Error %d\n", error); |
a9e2ae39 MF |
226 | wc->wc_error = error; |
227 | } | |
a7f6a5fb | 228 | |
a7f6a5fb | 229 | o2hb_bio_wait_dec(wc, 1); |
b559292e | 230 | bio_put(bio); |
a7f6a5fb MF |
231 | } |
232 | ||
233 | /* Setup a Bio to cover I/O against num_slots slots starting at | |
234 | * start_slot. */ | |
235 | static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, | |
236 | struct o2hb_bio_wait_ctxt *wc, | |
b559292e PR |
237 | unsigned int *current_slot, |
238 | unsigned int max_slots) | |
a7f6a5fb | 239 | { |
b559292e | 240 | int len, current_page; |
a7f6a5fb MF |
241 | unsigned int vec_len, vec_start; |
242 | unsigned int bits = reg->hr_block_bits; | |
243 | unsigned int spp = reg->hr_slots_per_page; | |
b559292e | 244 | unsigned int cs = *current_slot; |
a7f6a5fb MF |
245 | struct bio *bio; |
246 | struct page *page; | |
247 | ||
a7f6a5fb MF |
248 | /* Testing has shown this allocation to take long enough under |
249 | * GFP_KERNEL that the local node can get fenced. It would be | |
250 | * nicest if we could pre-allocate these bios and avoid this | |
251 | * all together. */ | |
b559292e | 252 | bio = bio_alloc(GFP_ATOMIC, 16); |
a7f6a5fb MF |
253 | if (!bio) { |
254 | mlog(ML_ERROR, "Could not alloc slots BIO!\n"); | |
255 | bio = ERR_PTR(-ENOMEM); | |
256 | goto bail; | |
257 | } | |
258 | ||
259 | /* Must put everything in 512 byte sectors for the bio... */ | |
b559292e | 260 | bio->bi_sector = (reg->hr_start_block + cs) << (bits - 9); |
a7f6a5fb MF |
261 | bio->bi_bdev = reg->hr_bdev; |
262 | bio->bi_private = wc; | |
263 | bio->bi_end_io = o2hb_bio_end_io; | |
264 | ||
b559292e PR |
265 | vec_start = (cs << bits) % PAGE_CACHE_SIZE; |
266 | while(cs < max_slots) { | |
267 | current_page = cs / spp; | |
268 | page = reg->hr_slot_data[current_page]; | |
a7f6a5fb | 269 | |
bc7e97cb | 270 | vec_len = min(PAGE_CACHE_SIZE - vec_start, |
b559292e | 271 | (max_slots-cs) * (PAGE_CACHE_SIZE/spp) ); |
a7f6a5fb MF |
272 | |
273 | mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", | |
b559292e | 274 | current_page, vec_len, vec_start); |
a7f6a5fb MF |
275 | |
276 | len = bio_add_page(bio, page, vec_len, vec_start); | |
b559292e | 277 | if (len != vec_len) break; |
a7f6a5fb | 278 | |
b559292e | 279 | cs += vec_len / (PAGE_CACHE_SIZE/spp); |
a7f6a5fb MF |
280 | vec_start = 0; |
281 | } | |
282 | ||
283 | bail: | |
b559292e | 284 | *current_slot = cs; |
a7f6a5fb MF |
285 | return bio; |
286 | } | |
287 | ||
a7f6a5fb MF |
288 | static int o2hb_read_slots(struct o2hb_region *reg, |
289 | unsigned int max_slots) | |
290 | { | |
b559292e PR |
291 | unsigned int current_slot=0; |
292 | int status; | |
a7f6a5fb | 293 | struct o2hb_bio_wait_ctxt wc; |
a7f6a5fb MF |
294 | struct bio *bio; |
295 | ||
b559292e | 296 | o2hb_bio_wait_init(&wc); |
a7f6a5fb | 297 | |
b559292e PR |
298 | while(current_slot < max_slots) { |
299 | bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots); | |
a7f6a5fb | 300 | if (IS_ERR(bio)) { |
a7f6a5fb MF |
301 | status = PTR_ERR(bio); |
302 | mlog_errno(status); | |
303 | goto bail_and_wait; | |
304 | } | |
a7f6a5fb | 305 | |
b559292e | 306 | atomic_inc(&wc.wc_num_reqs); |
a7f6a5fb MF |
307 | submit_bio(READ, bio); |
308 | } | |
309 | ||
310 | status = 0; | |
311 | ||
312 | bail_and_wait: | |
313 | o2hb_wait_on_io(reg, &wc); | |
a9e2ae39 MF |
314 | if (wc.wc_error && !status) |
315 | status = wc.wc_error; | |
a7f6a5fb | 316 | |
a7f6a5fb MF |
317 | return status; |
318 | } | |
319 | ||
320 | static int o2hb_issue_node_write(struct o2hb_region *reg, | |
a7f6a5fb MF |
321 | struct o2hb_bio_wait_ctxt *write_wc) |
322 | { | |
323 | int status; | |
324 | unsigned int slot; | |
325 | struct bio *bio; | |
326 | ||
b559292e | 327 | o2hb_bio_wait_init(write_wc); |
a7f6a5fb MF |
328 | |
329 | slot = o2nm_this_node(); | |
330 | ||
b559292e | 331 | bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1); |
a7f6a5fb MF |
332 | if (IS_ERR(bio)) { |
333 | status = PTR_ERR(bio); | |
334 | mlog_errno(status); | |
335 | goto bail; | |
336 | } | |
337 | ||
b559292e | 338 | atomic_inc(&write_wc->wc_num_reqs); |
a7f6a5fb MF |
339 | submit_bio(WRITE, bio); |
340 | ||
a7f6a5fb MF |
341 | status = 0; |
342 | bail: | |
343 | return status; | |
344 | } | |
345 | ||
346 | static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, | |
347 | struct o2hb_disk_heartbeat_block *hb_block) | |
348 | { | |
349 | __le32 old_cksum; | |
350 | u32 ret; | |
351 | ||
352 | /* We want to compute the block crc with a 0 value in the | |
353 | * hb_cksum field. Save it off here and replace after the | |
354 | * crc. */ | |
355 | old_cksum = hb_block->hb_cksum; | |
356 | hb_block->hb_cksum = 0; | |
357 | ||
358 | ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); | |
359 | ||
360 | hb_block->hb_cksum = old_cksum; | |
361 | ||
362 | return ret; | |
363 | } | |
364 | ||
365 | static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) | |
366 | { | |
70bacbdb MF |
367 | mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, " |
368 | "cksum = 0x%x, generation 0x%llx\n", | |
369 | (long long)le64_to_cpu(hb_block->hb_seq), | |
370 | hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum), | |
371 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
372 | } |
373 | ||
374 | static int o2hb_verify_crc(struct o2hb_region *reg, | |
375 | struct o2hb_disk_heartbeat_block *hb_block) | |
376 | { | |
377 | u32 read, computed; | |
378 | ||
379 | read = le32_to_cpu(hb_block->hb_cksum); | |
380 | computed = o2hb_compute_block_crc_le(reg, hb_block); | |
381 | ||
382 | return read == computed; | |
383 | } | |
384 | ||
385 | /* We want to make sure that nobody is heartbeating on top of us -- | |
386 | * this will help detect an invalid configuration. */ | |
387 | static int o2hb_check_last_timestamp(struct o2hb_region *reg) | |
388 | { | |
389 | int node_num, ret; | |
390 | struct o2hb_disk_slot *slot; | |
391 | struct o2hb_disk_heartbeat_block *hb_block; | |
392 | ||
393 | node_num = o2nm_this_node(); | |
394 | ||
395 | ret = 1; | |
396 | slot = ®->hr_slots[node_num]; | |
397 | /* Don't check on our 1st timestamp */ | |
398 | if (slot->ds_last_time) { | |
399 | hb_block = slot->ds_raw_block; | |
400 | ||
401 | if (le64_to_cpu(hb_block->hb_seq) != slot->ds_last_time) | |
402 | ret = 0; | |
403 | } | |
404 | ||
405 | return ret; | |
406 | } | |
407 | ||
408 | static inline void o2hb_prepare_block(struct o2hb_region *reg, | |
409 | u64 generation) | |
410 | { | |
411 | int node_num; | |
412 | u64 cputime; | |
413 | struct o2hb_disk_slot *slot; | |
414 | struct o2hb_disk_heartbeat_block *hb_block; | |
415 | ||
416 | node_num = o2nm_this_node(); | |
417 | slot = ®->hr_slots[node_num]; | |
418 | ||
419 | hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; | |
420 | memset(hb_block, 0, reg->hr_block_bytes); | |
421 | /* TODO: time stuff */ | |
422 | cputime = CURRENT_TIME.tv_sec; | |
423 | if (!cputime) | |
424 | cputime = 1; | |
425 | ||
426 | hb_block->hb_seq = cpu_to_le64(cputime); | |
427 | hb_block->hb_node = node_num; | |
428 | hb_block->hb_generation = cpu_to_le64(generation); | |
0db638f4 | 429 | hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS); |
a7f6a5fb MF |
430 | |
431 | /* This step must always happen last! */ | |
432 | hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, | |
433 | hb_block)); | |
434 | ||
70bacbdb | 435 | mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n", |
5fdf1e67 | 436 | (long long)generation, |
70bacbdb | 437 | le32_to_cpu(hb_block->hb_cksum)); |
a7f6a5fb MF |
438 | } |
439 | ||
440 | static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, | |
441 | struct o2nm_node *node, | |
442 | int idx) | |
443 | { | |
444 | struct list_head *iter; | |
445 | struct o2hb_callback_func *f; | |
446 | ||
447 | list_for_each(iter, &hbcall->list) { | |
448 | f = list_entry(iter, struct o2hb_callback_func, hc_item); | |
449 | mlog(ML_HEARTBEAT, "calling funcs %p\n", f); | |
450 | (f->hc_func)(node, idx, f->hc_data); | |
451 | } | |
452 | } | |
453 | ||
454 | /* Will run the list in order until we process the passed event */ | |
455 | static void o2hb_run_event_list(struct o2hb_node_event *queued_event) | |
456 | { | |
457 | int empty; | |
458 | struct o2hb_callback *hbcall; | |
459 | struct o2hb_node_event *event; | |
460 | ||
461 | spin_lock(&o2hb_live_lock); | |
462 | empty = list_empty(&queued_event->hn_item); | |
463 | spin_unlock(&o2hb_live_lock); | |
464 | if (empty) | |
465 | return; | |
466 | ||
467 | /* Holding callback sem assures we don't alter the callback | |
468 | * lists when doing this, and serializes ourselves with other | |
469 | * processes wanting callbacks. */ | |
470 | down_write(&o2hb_callback_sem); | |
471 | ||
472 | spin_lock(&o2hb_live_lock); | |
473 | while (!list_empty(&o2hb_node_events) | |
474 | && !list_empty(&queued_event->hn_item)) { | |
475 | event = list_entry(o2hb_node_events.next, | |
476 | struct o2hb_node_event, | |
477 | hn_item); | |
478 | list_del_init(&event->hn_item); | |
479 | spin_unlock(&o2hb_live_lock); | |
480 | ||
481 | mlog(ML_HEARTBEAT, "Node %s event for %d\n", | |
482 | event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", | |
483 | event->hn_node_num); | |
484 | ||
485 | hbcall = hbcall_from_type(event->hn_event_type); | |
486 | ||
487 | /* We should *never* have gotten on to the list with a | |
488 | * bad type... This isn't something that we should try | |
489 | * to recover from. */ | |
490 | BUG_ON(IS_ERR(hbcall)); | |
491 | ||
492 | o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); | |
493 | ||
494 | spin_lock(&o2hb_live_lock); | |
495 | } | |
496 | spin_unlock(&o2hb_live_lock); | |
497 | ||
498 | up_write(&o2hb_callback_sem); | |
499 | } | |
500 | ||
501 | static void o2hb_queue_node_event(struct o2hb_node_event *event, | |
502 | enum o2hb_callback_type type, | |
503 | struct o2nm_node *node, | |
504 | int node_num) | |
505 | { | |
506 | assert_spin_locked(&o2hb_live_lock); | |
507 | ||
508 | event->hn_event_type = type; | |
509 | event->hn_node = node; | |
510 | event->hn_node_num = node_num; | |
511 | ||
512 | mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", | |
513 | type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); | |
514 | ||
515 | list_add_tail(&event->hn_item, &o2hb_node_events); | |
516 | } | |
517 | ||
518 | static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) | |
519 | { | |
520 | struct o2hb_node_event event = | |
521 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
522 | struct o2nm_node *node; | |
523 | ||
524 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
525 | if (!node) | |
526 | return; | |
527 | ||
528 | spin_lock(&o2hb_live_lock); | |
529 | if (!list_empty(&slot->ds_live_item)) { | |
530 | mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", | |
531 | slot->ds_node_num); | |
532 | ||
533 | list_del_init(&slot->ds_live_item); | |
534 | ||
535 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
536 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
537 | ||
538 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
539 | slot->ds_node_num); | |
540 | } | |
541 | } | |
542 | spin_unlock(&o2hb_live_lock); | |
543 | ||
544 | o2hb_run_event_list(&event); | |
545 | ||
546 | o2nm_node_put(node); | |
547 | } | |
548 | ||
549 | static int o2hb_check_slot(struct o2hb_region *reg, | |
550 | struct o2hb_disk_slot *slot) | |
551 | { | |
552 | int changed = 0, gen_changed = 0; | |
553 | struct o2hb_node_event event = | |
554 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
555 | struct o2nm_node *node; | |
556 | struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; | |
557 | u64 cputime; | |
0db638f4 MF |
558 | unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS; |
559 | unsigned int slot_dead_ms; | |
a7f6a5fb MF |
560 | |
561 | memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); | |
562 | ||
563 | /* Is this correct? Do we assume that the node doesn't exist | |
564 | * if we're not configured for him? */ | |
565 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
566 | if (!node) | |
567 | return 0; | |
568 | ||
569 | if (!o2hb_verify_crc(reg, hb_block)) { | |
570 | /* all paths from here will drop o2hb_live_lock for | |
571 | * us. */ | |
572 | spin_lock(&o2hb_live_lock); | |
573 | ||
574 | /* Don't print an error on the console in this case - | |
575 | * a freshly formatted heartbeat area will not have a | |
576 | * crc set on it. */ | |
577 | if (list_empty(&slot->ds_live_item)) | |
578 | goto out; | |
579 | ||
580 | /* The node is live but pushed out a bad crc. We | |
581 | * consider it a transient miss but don't populate any | |
582 | * other values as they may be junk. */ | |
583 | mlog(ML_ERROR, "Node %d has written a bad crc to %s\n", | |
584 | slot->ds_node_num, reg->hr_dev_name); | |
585 | o2hb_dump_slot(hb_block); | |
586 | ||
587 | slot->ds_equal_samples++; | |
588 | goto fire_callbacks; | |
589 | } | |
590 | ||
591 | /* we don't care if these wrap.. the state transitions below | |
592 | * clear at the right places */ | |
593 | cputime = le64_to_cpu(hb_block->hb_seq); | |
594 | if (slot->ds_last_time != cputime) | |
595 | slot->ds_changed_samples++; | |
596 | else | |
597 | slot->ds_equal_samples++; | |
598 | slot->ds_last_time = cputime; | |
599 | ||
600 | /* The node changed heartbeat generations. We assume this to | |
601 | * mean it dropped off but came back before we timed out. We | |
602 | * want to consider it down for the time being but don't want | |
603 | * to lose any changed_samples state we might build up to | |
604 | * considering it live again. */ | |
605 | if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { | |
606 | gen_changed = 1; | |
607 | slot->ds_equal_samples = 0; | |
70bacbdb MF |
608 | mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx " |
609 | "to 0x%llx)\n", slot->ds_node_num, | |
610 | (long long)slot->ds_last_generation, | |
611 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
612 | } |
613 | ||
614 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
615 | ||
70bacbdb MF |
616 | mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x " |
617 | "seq %llu last %llu changed %u equal %u\n", | |
618 | slot->ds_node_num, (long long)slot->ds_last_generation, | |
619 | le32_to_cpu(hb_block->hb_cksum), | |
620 | (unsigned long long)le64_to_cpu(hb_block->hb_seq), | |
621 | (unsigned long long)slot->ds_last_time, slot->ds_changed_samples, | |
a7f6a5fb MF |
622 | slot->ds_equal_samples); |
623 | ||
624 | spin_lock(&o2hb_live_lock); | |
625 | ||
626 | fire_callbacks: | |
627 | /* dead nodes only come to life after some number of | |
628 | * changes at any time during their dead time */ | |
629 | if (list_empty(&slot->ds_live_item) && | |
630 | slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { | |
70bacbdb MF |
631 | mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n", |
632 | slot->ds_node_num, (long long)slot->ds_last_generation); | |
a7f6a5fb MF |
633 | |
634 | /* first on the list generates a callback */ | |
635 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
636 | set_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
637 | ||
638 | o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, | |
639 | slot->ds_node_num); | |
640 | ||
641 | changed = 1; | |
642 | } | |
643 | ||
644 | list_add_tail(&slot->ds_live_item, | |
645 | &o2hb_live_slots[slot->ds_node_num]); | |
646 | ||
647 | slot->ds_equal_samples = 0; | |
0db638f4 MF |
648 | |
649 | /* We want to be sure that all nodes agree on the | |
650 | * number of milliseconds before a node will be | |
651 | * considered dead. The self-fencing timeout is | |
652 | * computed from this value, and a discrepancy might | |
653 | * result in heartbeat calling a node dead when it | |
654 | * hasn't self-fenced yet. */ | |
655 | slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms); | |
656 | if (slot_dead_ms && slot_dead_ms != dead_ms) { | |
657 | /* TODO: Perhaps we can fail the region here. */ | |
658 | mlog(ML_ERROR, "Node %d on device %s has a dead count " | |
659 | "of %u ms, but our count is %u ms.\n" | |
660 | "Please double check your configuration values " | |
661 | "for 'O2CB_HEARTBEAT_THRESHOLD'\n", | |
662 | slot->ds_node_num, reg->hr_dev_name, slot_dead_ms, | |
663 | dead_ms); | |
664 | } | |
a7f6a5fb MF |
665 | goto out; |
666 | } | |
667 | ||
668 | /* if the list is dead, we're done.. */ | |
669 | if (list_empty(&slot->ds_live_item)) | |
670 | goto out; | |
671 | ||
672 | /* live nodes only go dead after enough consequtive missed | |
673 | * samples.. reset the missed counter whenever we see | |
674 | * activity */ | |
675 | if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { | |
676 | mlog(ML_HEARTBEAT, "Node %d left my region\n", | |
677 | slot->ds_node_num); | |
678 | ||
679 | /* last off the live_slot generates a callback */ | |
680 | list_del_init(&slot->ds_live_item); | |
681 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
682 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
683 | ||
684 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
685 | slot->ds_node_num); | |
686 | ||
687 | changed = 1; | |
688 | } | |
689 | ||
690 | /* We don't clear this because the node is still | |
691 | * actually writing new blocks. */ | |
692 | if (!gen_changed) | |
693 | slot->ds_changed_samples = 0; | |
694 | goto out; | |
695 | } | |
696 | if (slot->ds_changed_samples) { | |
697 | slot->ds_changed_samples = 0; | |
698 | slot->ds_equal_samples = 0; | |
699 | } | |
700 | out: | |
701 | spin_unlock(&o2hb_live_lock); | |
702 | ||
703 | o2hb_run_event_list(&event); | |
704 | ||
705 | o2nm_node_put(node); | |
706 | return changed; | |
707 | } | |
708 | ||
709 | /* This could be faster if we just implmented a find_last_bit, but I | |
710 | * don't think the circumstances warrant it. */ | |
711 | static int o2hb_highest_node(unsigned long *nodes, | |
712 | int numbits) | |
713 | { | |
714 | int highest, node; | |
715 | ||
716 | highest = numbits; | |
717 | node = -1; | |
718 | while ((node = find_next_bit(nodes, numbits, node + 1)) != -1) { | |
719 | if (node >= numbits) | |
720 | break; | |
721 | ||
722 | highest = node; | |
723 | } | |
724 | ||
725 | return highest; | |
726 | } | |
727 | ||
a9e2ae39 | 728 | static int o2hb_do_disk_heartbeat(struct o2hb_region *reg) |
a7f6a5fb MF |
729 | { |
730 | int i, ret, highest_node, change = 0; | |
731 | unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
a7f6a5fb MF |
732 | struct o2hb_bio_wait_ctxt write_wc; |
733 | ||
a9e2ae39 MF |
734 | ret = o2nm_configured_node_map(configured_nodes, |
735 | sizeof(configured_nodes)); | |
736 | if (ret) { | |
737 | mlog_errno(ret); | |
738 | return ret; | |
739 | } | |
a7f6a5fb MF |
740 | |
741 | highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); | |
742 | if (highest_node >= O2NM_MAX_NODES) { | |
743 | mlog(ML_NOTICE, "ocfs2_heartbeat: no configured nodes found!\n"); | |
a9e2ae39 | 744 | return -EINVAL; |
a7f6a5fb MF |
745 | } |
746 | ||
747 | /* No sense in reading the slots of nodes that don't exist | |
748 | * yet. Of course, if the node definitions have holes in them | |
749 | * then we're reading an empty slot anyway... Consider this | |
750 | * best-effort. */ | |
751 | ret = o2hb_read_slots(reg, highest_node + 1); | |
752 | if (ret < 0) { | |
753 | mlog_errno(ret); | |
a9e2ae39 | 754 | return ret; |
a7f6a5fb MF |
755 | } |
756 | ||
757 | /* With an up to date view of the slots, we can check that no | |
758 | * other node has been improperly configured to heartbeat in | |
759 | * our slot. */ | |
760 | if (!o2hb_check_last_timestamp(reg)) | |
761 | mlog(ML_ERROR, "Device \"%s\": another node is heartbeating " | |
762 | "in our slot!\n", reg->hr_dev_name); | |
763 | ||
764 | /* fill in the proper info for our next heartbeat */ | |
765 | o2hb_prepare_block(reg, reg->hr_generation); | |
766 | ||
767 | /* And fire off the write. Note that we don't wait on this I/O | |
768 | * until later. */ | |
b559292e | 769 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
770 | if (ret < 0) { |
771 | mlog_errno(ret); | |
a9e2ae39 | 772 | return ret; |
a7f6a5fb MF |
773 | } |
774 | ||
775 | i = -1; | |
776 | while((i = find_next_bit(configured_nodes, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
777 | ||
778 | change |= o2hb_check_slot(reg, ®->hr_slots[i]); | |
779 | } | |
780 | ||
781 | /* | |
782 | * We have to be sure we've advertised ourselves on disk | |
783 | * before we can go to steady state. This ensures that | |
784 | * people we find in our steady state have seen us. | |
785 | */ | |
786 | o2hb_wait_on_io(reg, &write_wc); | |
a9e2ae39 MF |
787 | if (write_wc.wc_error) { |
788 | /* Do not re-arm the write timeout on I/O error - we | |
789 | * can't be sure that the new block ever made it to | |
790 | * disk */ | |
791 | mlog(ML_ERROR, "Write error %d on device \"%s\"\n", | |
792 | write_wc.wc_error, reg->hr_dev_name); | |
793 | return write_wc.wc_error; | |
794 | } | |
795 | ||
a7f6a5fb MF |
796 | o2hb_arm_write_timeout(reg); |
797 | ||
798 | /* let the person who launched us know when things are steady */ | |
799 | if (!change && (atomic_read(®->hr_steady_iterations) != 0)) { | |
800 | if (atomic_dec_and_test(®->hr_steady_iterations)) | |
801 | wake_up(&o2hb_steady_queue); | |
802 | } | |
a9e2ae39 MF |
803 | |
804 | return 0; | |
a7f6a5fb MF |
805 | } |
806 | ||
807 | /* Subtract b from a, storing the result in a. a *must* have a larger | |
808 | * value than b. */ | |
809 | static void o2hb_tv_subtract(struct timeval *a, | |
810 | struct timeval *b) | |
811 | { | |
812 | /* just return 0 when a is after b */ | |
813 | if (a->tv_sec < b->tv_sec || | |
814 | (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec)) { | |
815 | a->tv_sec = 0; | |
816 | a->tv_usec = 0; | |
817 | return; | |
818 | } | |
819 | ||
820 | a->tv_sec -= b->tv_sec; | |
821 | a->tv_usec -= b->tv_usec; | |
822 | while ( a->tv_usec < 0 ) { | |
823 | a->tv_sec--; | |
824 | a->tv_usec += 1000000; | |
825 | } | |
826 | } | |
827 | ||
828 | static unsigned int o2hb_elapsed_msecs(struct timeval *start, | |
829 | struct timeval *end) | |
830 | { | |
831 | struct timeval res = *end; | |
832 | ||
833 | o2hb_tv_subtract(&res, start); | |
834 | ||
835 | return res.tv_sec * 1000 + res.tv_usec / 1000; | |
836 | } | |
837 | ||
838 | /* | |
839 | * we ride the region ref that the region dir holds. before the region | |
840 | * dir is removed and drops it ref it will wait to tear down this | |
841 | * thread. | |
842 | */ | |
843 | static int o2hb_thread(void *data) | |
844 | { | |
845 | int i, ret; | |
846 | struct o2hb_region *reg = data; | |
a7f6a5fb MF |
847 | struct o2hb_bio_wait_ctxt write_wc; |
848 | struct timeval before_hb, after_hb; | |
849 | unsigned int elapsed_msec; | |
850 | ||
851 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); | |
852 | ||
853 | set_user_nice(current, -20); | |
854 | ||
855 | while (!kthread_should_stop() && !reg->hr_unclean_stop) { | |
856 | /* We track the time spent inside | |
857 | * o2hb_do_disk_heartbeat so that we avoid more then | |
858 | * hr_timeout_ms between disk writes. On busy systems | |
859 | * this should result in a heartbeat which is less | |
860 | * likely to time itself out. */ | |
861 | do_gettimeofday(&before_hb); | |
862 | ||
a9e2ae39 MF |
863 | i = 0; |
864 | do { | |
865 | ret = o2hb_do_disk_heartbeat(reg); | |
866 | } while (ret && ++i < 2); | |
a7f6a5fb MF |
867 | |
868 | do_gettimeofday(&after_hb); | |
869 | elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb); | |
870 | ||
871 | mlog(0, "start = %lu.%lu, end = %lu.%lu, msec = %u\n", | |
215c7f9f MF |
872 | before_hb.tv_sec, (unsigned long) before_hb.tv_usec, |
873 | after_hb.tv_sec, (unsigned long) after_hb.tv_usec, | |
874 | elapsed_msec); | |
a7f6a5fb MF |
875 | |
876 | if (elapsed_msec < reg->hr_timeout_ms) { | |
877 | /* the kthread api has blocked signals for us so no | |
878 | * need to record the return value. */ | |
879 | msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); | |
880 | } | |
881 | } | |
882 | ||
883 | o2hb_disarm_write_timeout(reg); | |
884 | ||
885 | /* unclean stop is only used in very bad situation */ | |
886 | for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) | |
887 | o2hb_shutdown_slot(®->hr_slots[i]); | |
888 | ||
889 | /* Explicit down notification - avoid forcing the other nodes | |
890 | * to timeout on this region when we could just as easily | |
891 | * write a clear generation - thus indicating to them that | |
892 | * this node has left this region. | |
893 | * | |
894 | * XXX: Should we skip this on unclean_stop? */ | |
895 | o2hb_prepare_block(reg, 0); | |
b559292e | 896 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
897 | if (ret == 0) { |
898 | o2hb_wait_on_io(reg, &write_wc); | |
a7f6a5fb MF |
899 | } else { |
900 | mlog_errno(ret); | |
901 | } | |
902 | ||
903 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread exiting\n"); | |
904 | ||
905 | return 0; | |
906 | } | |
907 | ||
908 | void o2hb_init(void) | |
909 | { | |
910 | int i; | |
911 | ||
912 | for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) | |
913 | INIT_LIST_HEAD(&o2hb_callbacks[i].list); | |
914 | ||
915 | for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) | |
916 | INIT_LIST_HEAD(&o2hb_live_slots[i]); | |
917 | ||
918 | INIT_LIST_HEAD(&o2hb_node_events); | |
919 | ||
920 | memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap)); | |
921 | } | |
922 | ||
923 | /* if we're already in a callback then we're already serialized by the sem */ | |
924 | static void o2hb_fill_node_map_from_callback(unsigned long *map, | |
925 | unsigned bytes) | |
926 | { | |
927 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); | |
928 | ||
929 | memcpy(map, &o2hb_live_node_bitmap, bytes); | |
930 | } | |
931 | ||
932 | /* | |
933 | * get a map of all nodes that are heartbeating in any regions | |
934 | */ | |
935 | void o2hb_fill_node_map(unsigned long *map, unsigned bytes) | |
936 | { | |
937 | /* callers want to serialize this map and callbacks so that they | |
938 | * can trust that they don't miss nodes coming to the party */ | |
939 | down_read(&o2hb_callback_sem); | |
940 | spin_lock(&o2hb_live_lock); | |
941 | o2hb_fill_node_map_from_callback(map, bytes); | |
942 | spin_unlock(&o2hb_live_lock); | |
943 | up_read(&o2hb_callback_sem); | |
944 | } | |
945 | EXPORT_SYMBOL_GPL(o2hb_fill_node_map); | |
946 | ||
947 | /* | |
948 | * heartbeat configfs bits. The heartbeat set is a default set under | |
949 | * the cluster set in nodemanager.c. | |
950 | */ | |
951 | ||
952 | static struct o2hb_region *to_o2hb_region(struct config_item *item) | |
953 | { | |
954 | return item ? container_of(item, struct o2hb_region, hr_item) : NULL; | |
955 | } | |
956 | ||
957 | /* drop_item only drops its ref after killing the thread, nothing should | |
958 | * be using the region anymore. this has to clean up any state that | |
959 | * attributes might have built up. */ | |
960 | static void o2hb_region_release(struct config_item *item) | |
961 | { | |
962 | int i; | |
963 | struct page *page; | |
964 | struct o2hb_region *reg = to_o2hb_region(item); | |
965 | ||
966 | if (reg->hr_tmp_block) | |
967 | kfree(reg->hr_tmp_block); | |
968 | ||
969 | if (reg->hr_slot_data) { | |
970 | for (i = 0; i < reg->hr_num_pages; i++) { | |
971 | page = reg->hr_slot_data[i]; | |
972 | if (page) | |
973 | __free_page(page); | |
974 | } | |
975 | kfree(reg->hr_slot_data); | |
976 | } | |
977 | ||
978 | if (reg->hr_bdev) | |
9a1c3542 | 979 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
980 | |
981 | if (reg->hr_slots) | |
982 | kfree(reg->hr_slots); | |
983 | ||
984 | spin_lock(&o2hb_live_lock); | |
985 | list_del(®->hr_all_item); | |
986 | spin_unlock(&o2hb_live_lock); | |
987 | ||
988 | kfree(reg); | |
989 | } | |
990 | ||
991 | static int o2hb_read_block_input(struct o2hb_region *reg, | |
992 | const char *page, | |
993 | size_t count, | |
994 | unsigned long *ret_bytes, | |
995 | unsigned int *ret_bits) | |
996 | { | |
997 | unsigned long bytes; | |
998 | char *p = (char *)page; | |
999 | ||
1000 | bytes = simple_strtoul(p, &p, 0); | |
1001 | if (!p || (*p && (*p != '\n'))) | |
1002 | return -EINVAL; | |
1003 | ||
1004 | /* Heartbeat and fs min / max block sizes are the same. */ | |
1005 | if (bytes > 4096 || bytes < 512) | |
1006 | return -ERANGE; | |
1007 | if (hweight16(bytes) != 1) | |
1008 | return -EINVAL; | |
1009 | ||
1010 | if (ret_bytes) | |
1011 | *ret_bytes = bytes; | |
1012 | if (ret_bits) | |
1013 | *ret_bits = ffs(bytes) - 1; | |
1014 | ||
1015 | return 0; | |
1016 | } | |
1017 | ||
1018 | static ssize_t o2hb_region_block_bytes_read(struct o2hb_region *reg, | |
1019 | char *page) | |
1020 | { | |
1021 | return sprintf(page, "%u\n", reg->hr_block_bytes); | |
1022 | } | |
1023 | ||
1024 | static ssize_t o2hb_region_block_bytes_write(struct o2hb_region *reg, | |
1025 | const char *page, | |
1026 | size_t count) | |
1027 | { | |
1028 | int status; | |
1029 | unsigned long block_bytes; | |
1030 | unsigned int block_bits; | |
1031 | ||
1032 | if (reg->hr_bdev) | |
1033 | return -EINVAL; | |
1034 | ||
1035 | status = o2hb_read_block_input(reg, page, count, | |
1036 | &block_bytes, &block_bits); | |
1037 | if (status) | |
1038 | return status; | |
1039 | ||
1040 | reg->hr_block_bytes = (unsigned int)block_bytes; | |
1041 | reg->hr_block_bits = block_bits; | |
1042 | ||
1043 | return count; | |
1044 | } | |
1045 | ||
1046 | static ssize_t o2hb_region_start_block_read(struct o2hb_region *reg, | |
1047 | char *page) | |
1048 | { | |
1049 | return sprintf(page, "%llu\n", reg->hr_start_block); | |
1050 | } | |
1051 | ||
1052 | static ssize_t o2hb_region_start_block_write(struct o2hb_region *reg, | |
1053 | const char *page, | |
1054 | size_t count) | |
1055 | { | |
1056 | unsigned long long tmp; | |
1057 | char *p = (char *)page; | |
1058 | ||
1059 | if (reg->hr_bdev) | |
1060 | return -EINVAL; | |
1061 | ||
1062 | tmp = simple_strtoull(p, &p, 0); | |
1063 | if (!p || (*p && (*p != '\n'))) | |
1064 | return -EINVAL; | |
1065 | ||
1066 | reg->hr_start_block = tmp; | |
1067 | ||
1068 | return count; | |
1069 | } | |
1070 | ||
1071 | static ssize_t o2hb_region_blocks_read(struct o2hb_region *reg, | |
1072 | char *page) | |
1073 | { | |
1074 | return sprintf(page, "%d\n", reg->hr_blocks); | |
1075 | } | |
1076 | ||
1077 | static ssize_t o2hb_region_blocks_write(struct o2hb_region *reg, | |
1078 | const char *page, | |
1079 | size_t count) | |
1080 | { | |
1081 | unsigned long tmp; | |
1082 | char *p = (char *)page; | |
1083 | ||
1084 | if (reg->hr_bdev) | |
1085 | return -EINVAL; | |
1086 | ||
1087 | tmp = simple_strtoul(p, &p, 0); | |
1088 | if (!p || (*p && (*p != '\n'))) | |
1089 | return -EINVAL; | |
1090 | ||
1091 | if (tmp > O2NM_MAX_NODES || tmp == 0) | |
1092 | return -ERANGE; | |
1093 | ||
1094 | reg->hr_blocks = (unsigned int)tmp; | |
1095 | ||
1096 | return count; | |
1097 | } | |
1098 | ||
1099 | static ssize_t o2hb_region_dev_read(struct o2hb_region *reg, | |
1100 | char *page) | |
1101 | { | |
1102 | unsigned int ret = 0; | |
1103 | ||
1104 | if (reg->hr_bdev) | |
1105 | ret = sprintf(page, "%s\n", reg->hr_dev_name); | |
1106 | ||
1107 | return ret; | |
1108 | } | |
1109 | ||
1110 | static void o2hb_init_region_params(struct o2hb_region *reg) | |
1111 | { | |
1112 | reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits; | |
1113 | reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; | |
1114 | ||
1115 | mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", | |
1116 | reg->hr_start_block, reg->hr_blocks); | |
1117 | mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", | |
1118 | reg->hr_block_bytes, reg->hr_block_bits); | |
1119 | mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); | |
1120 | mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); | |
1121 | } | |
1122 | ||
1123 | static int o2hb_map_slot_data(struct o2hb_region *reg) | |
1124 | { | |
1125 | int i, j; | |
1126 | unsigned int last_slot; | |
1127 | unsigned int spp = reg->hr_slots_per_page; | |
1128 | struct page *page; | |
1129 | char *raw; | |
1130 | struct o2hb_disk_slot *slot; | |
1131 | ||
1132 | reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); | |
1133 | if (reg->hr_tmp_block == NULL) { | |
1134 | mlog_errno(-ENOMEM); | |
1135 | return -ENOMEM; | |
1136 | } | |
1137 | ||
1138 | reg->hr_slots = kcalloc(reg->hr_blocks, | |
1139 | sizeof(struct o2hb_disk_slot), GFP_KERNEL); | |
1140 | if (reg->hr_slots == NULL) { | |
1141 | mlog_errno(-ENOMEM); | |
1142 | return -ENOMEM; | |
1143 | } | |
1144 | ||
1145 | for(i = 0; i < reg->hr_blocks; i++) { | |
1146 | slot = ®->hr_slots[i]; | |
1147 | slot->ds_node_num = i; | |
1148 | INIT_LIST_HEAD(&slot->ds_live_item); | |
1149 | slot->ds_raw_block = NULL; | |
1150 | } | |
1151 | ||
1152 | reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; | |
1153 | mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " | |
1154 | "at %u blocks per page\n", | |
1155 | reg->hr_num_pages, reg->hr_blocks, spp); | |
1156 | ||
1157 | reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), | |
1158 | GFP_KERNEL); | |
1159 | if (!reg->hr_slot_data) { | |
1160 | mlog_errno(-ENOMEM); | |
1161 | return -ENOMEM; | |
1162 | } | |
1163 | ||
1164 | for(i = 0; i < reg->hr_num_pages; i++) { | |
1165 | page = alloc_page(GFP_KERNEL); | |
1166 | if (!page) { | |
1167 | mlog_errno(-ENOMEM); | |
1168 | return -ENOMEM; | |
1169 | } | |
1170 | ||
1171 | reg->hr_slot_data[i] = page; | |
1172 | ||
1173 | last_slot = i * spp; | |
1174 | raw = page_address(page); | |
1175 | for (j = 0; | |
1176 | (j < spp) && ((j + last_slot) < reg->hr_blocks); | |
1177 | j++) { | |
1178 | BUG_ON((j + last_slot) >= reg->hr_blocks); | |
1179 | ||
1180 | slot = ®->hr_slots[j + last_slot]; | |
1181 | slot->ds_raw_block = | |
1182 | (struct o2hb_disk_heartbeat_block *) raw; | |
1183 | ||
1184 | raw += reg->hr_block_bytes; | |
1185 | } | |
1186 | } | |
1187 | ||
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | /* Read in all the slots available and populate the tracking | |
1192 | * structures so that we can start with a baseline idea of what's | |
1193 | * there. */ | |
1194 | static int o2hb_populate_slot_data(struct o2hb_region *reg) | |
1195 | { | |
1196 | int ret, i; | |
1197 | struct o2hb_disk_slot *slot; | |
1198 | struct o2hb_disk_heartbeat_block *hb_block; | |
1199 | ||
1200 | mlog_entry_void(); | |
1201 | ||
1202 | ret = o2hb_read_slots(reg, reg->hr_blocks); | |
1203 | if (ret) { | |
1204 | mlog_errno(ret); | |
1205 | goto out; | |
1206 | } | |
1207 | ||
1208 | /* We only want to get an idea of the values initially in each | |
1209 | * slot, so we do no verification - o2hb_check_slot will | |
1210 | * actually determine if each configured slot is valid and | |
1211 | * whether any values have changed. */ | |
1212 | for(i = 0; i < reg->hr_blocks; i++) { | |
1213 | slot = ®->hr_slots[i]; | |
1214 | hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; | |
1215 | ||
1216 | /* Only fill the values that o2hb_check_slot uses to | |
1217 | * determine changing slots */ | |
1218 | slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); | |
1219 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
1220 | } | |
1221 | ||
1222 | out: | |
1223 | mlog_exit(ret); | |
1224 | return ret; | |
1225 | } | |
1226 | ||
1227 | /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */ | |
1228 | static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, | |
1229 | const char *page, | |
1230 | size_t count) | |
1231 | { | |
e6c352db | 1232 | struct task_struct *hb_task; |
a7f6a5fb MF |
1233 | long fd; |
1234 | int sectsize; | |
1235 | char *p = (char *)page; | |
1236 | struct file *filp = NULL; | |
1237 | struct inode *inode = NULL; | |
1238 | ssize_t ret = -EINVAL; | |
1239 | ||
1240 | if (reg->hr_bdev) | |
1241 | goto out; | |
1242 | ||
1243 | /* We can't heartbeat without having had our node number | |
1244 | * configured yet. */ | |
1245 | if (o2nm_this_node() == O2NM_MAX_NODES) | |
1246 | goto out; | |
1247 | ||
1248 | fd = simple_strtol(p, &p, 0); | |
1249 | if (!p || (*p && (*p != '\n'))) | |
1250 | goto out; | |
1251 | ||
1252 | if (fd < 0 || fd >= INT_MAX) | |
1253 | goto out; | |
1254 | ||
1255 | filp = fget(fd); | |
1256 | if (filp == NULL) | |
1257 | goto out; | |
1258 | ||
1259 | if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || | |
1260 | reg->hr_block_bytes == 0) | |
1261 | goto out; | |
1262 | ||
1263 | inode = igrab(filp->f_mapping->host); | |
1264 | if (inode == NULL) | |
1265 | goto out; | |
1266 | ||
1267 | if (!S_ISBLK(inode->i_mode)) | |
1268 | goto out; | |
1269 | ||
1270 | reg->hr_bdev = I_BDEV(filp->f_mapping->host); | |
1271 | ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, 0); | |
1272 | if (ret) { | |
1273 | reg->hr_bdev = NULL; | |
1274 | goto out; | |
1275 | } | |
1276 | inode = NULL; | |
1277 | ||
1278 | bdevname(reg->hr_bdev, reg->hr_dev_name); | |
1279 | ||
1280 | sectsize = bdev_hardsect_size(reg->hr_bdev); | |
1281 | if (sectsize != reg->hr_block_bytes) { | |
1282 | mlog(ML_ERROR, | |
1283 | "blocksize %u incorrect for device, expected %d", | |
1284 | reg->hr_block_bytes, sectsize); | |
1285 | ret = -EINVAL; | |
1286 | goto out; | |
1287 | } | |
1288 | ||
1289 | o2hb_init_region_params(reg); | |
1290 | ||
1291 | /* Generation of zero is invalid */ | |
1292 | do { | |
1293 | get_random_bytes(®->hr_generation, | |
1294 | sizeof(reg->hr_generation)); | |
1295 | } while (reg->hr_generation == 0); | |
1296 | ||
1297 | ret = o2hb_map_slot_data(reg); | |
1298 | if (ret) { | |
1299 | mlog_errno(ret); | |
1300 | goto out; | |
1301 | } | |
1302 | ||
1303 | ret = o2hb_populate_slot_data(reg); | |
1304 | if (ret) { | |
1305 | mlog_errno(ret); | |
1306 | goto out; | |
1307 | } | |
1308 | ||
c4028958 | 1309 | INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout); |
a7f6a5fb MF |
1310 | |
1311 | /* | |
1312 | * A node is considered live after it has beat LIVE_THRESHOLD | |
1313 | * times. We're not steady until we've given them a chance | |
1314 | * _after_ our first read. | |
1315 | */ | |
1316 | atomic_set(®->hr_steady_iterations, O2HB_LIVE_THRESHOLD + 1); | |
1317 | ||
e6c352db JB |
1318 | hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s", |
1319 | reg->hr_item.ci_name); | |
1320 | if (IS_ERR(hb_task)) { | |
1321 | ret = PTR_ERR(hb_task); | |
a7f6a5fb | 1322 | mlog_errno(ret); |
a7f6a5fb MF |
1323 | goto out; |
1324 | } | |
1325 | ||
e6c352db JB |
1326 | spin_lock(&o2hb_live_lock); |
1327 | reg->hr_task = hb_task; | |
1328 | spin_unlock(&o2hb_live_lock); | |
1329 | ||
a7f6a5fb MF |
1330 | ret = wait_event_interruptible(o2hb_steady_queue, |
1331 | atomic_read(®->hr_steady_iterations) == 0); | |
1332 | if (ret) { | |
e6df3a66 | 1333 | /* We got interrupted (hello ptrace!). Clean up */ |
e6c352db JB |
1334 | spin_lock(&o2hb_live_lock); |
1335 | hb_task = reg->hr_task; | |
a7f6a5fb | 1336 | reg->hr_task = NULL; |
e6c352db JB |
1337 | spin_unlock(&o2hb_live_lock); |
1338 | ||
1339 | if (hb_task) | |
1340 | kthread_stop(hb_task); | |
a7f6a5fb MF |
1341 | goto out; |
1342 | } | |
1343 | ||
e6df3a66 JB |
1344 | /* Ok, we were woken. Make sure it wasn't by drop_item() */ |
1345 | spin_lock(&o2hb_live_lock); | |
1346 | hb_task = reg->hr_task; | |
1347 | spin_unlock(&o2hb_live_lock); | |
1348 | ||
1349 | if (hb_task) | |
1350 | ret = count; | |
1351 | else | |
1352 | ret = -EIO; | |
1353 | ||
a7f6a5fb MF |
1354 | out: |
1355 | if (filp) | |
1356 | fput(filp); | |
1357 | if (inode) | |
1358 | iput(inode); | |
1359 | if (ret < 0) { | |
1360 | if (reg->hr_bdev) { | |
9a1c3542 | 1361 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
1362 | reg->hr_bdev = NULL; |
1363 | } | |
1364 | } | |
1365 | return ret; | |
1366 | } | |
1367 | ||
92efc152 ZW |
1368 | static ssize_t o2hb_region_pid_read(struct o2hb_region *reg, |
1369 | char *page) | |
1370 | { | |
e6c352db JB |
1371 | pid_t pid = 0; |
1372 | ||
1373 | spin_lock(&o2hb_live_lock); | |
1374 | if (reg->hr_task) | |
ba25f9dc | 1375 | pid = task_pid_nr(reg->hr_task); |
e6c352db JB |
1376 | spin_unlock(&o2hb_live_lock); |
1377 | ||
1378 | if (!pid) | |
92efc152 ZW |
1379 | return 0; |
1380 | ||
e6c352db | 1381 | return sprintf(page, "%u\n", pid); |
92efc152 ZW |
1382 | } |
1383 | ||
a7f6a5fb MF |
1384 | struct o2hb_region_attribute { |
1385 | struct configfs_attribute attr; | |
1386 | ssize_t (*show)(struct o2hb_region *, char *); | |
1387 | ssize_t (*store)(struct o2hb_region *, const char *, size_t); | |
1388 | }; | |
1389 | ||
1390 | static struct o2hb_region_attribute o2hb_region_attr_block_bytes = { | |
1391 | .attr = { .ca_owner = THIS_MODULE, | |
1392 | .ca_name = "block_bytes", | |
1393 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1394 | .show = o2hb_region_block_bytes_read, | |
1395 | .store = o2hb_region_block_bytes_write, | |
1396 | }; | |
1397 | ||
1398 | static struct o2hb_region_attribute o2hb_region_attr_start_block = { | |
1399 | .attr = { .ca_owner = THIS_MODULE, | |
1400 | .ca_name = "start_block", | |
1401 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1402 | .show = o2hb_region_start_block_read, | |
1403 | .store = o2hb_region_start_block_write, | |
1404 | }; | |
1405 | ||
1406 | static struct o2hb_region_attribute o2hb_region_attr_blocks = { | |
1407 | .attr = { .ca_owner = THIS_MODULE, | |
1408 | .ca_name = "blocks", | |
1409 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1410 | .show = o2hb_region_blocks_read, | |
1411 | .store = o2hb_region_blocks_write, | |
1412 | }; | |
1413 | ||
1414 | static struct o2hb_region_attribute o2hb_region_attr_dev = { | |
1415 | .attr = { .ca_owner = THIS_MODULE, | |
1416 | .ca_name = "dev", | |
1417 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1418 | .show = o2hb_region_dev_read, | |
1419 | .store = o2hb_region_dev_write, | |
1420 | }; | |
1421 | ||
92efc152 ZW |
1422 | static struct o2hb_region_attribute o2hb_region_attr_pid = { |
1423 | .attr = { .ca_owner = THIS_MODULE, | |
1424 | .ca_name = "pid", | |
1425 | .ca_mode = S_IRUGO | S_IRUSR }, | |
1426 | .show = o2hb_region_pid_read, | |
1427 | }; | |
1428 | ||
a7f6a5fb MF |
1429 | static struct configfs_attribute *o2hb_region_attrs[] = { |
1430 | &o2hb_region_attr_block_bytes.attr, | |
1431 | &o2hb_region_attr_start_block.attr, | |
1432 | &o2hb_region_attr_blocks.attr, | |
1433 | &o2hb_region_attr_dev.attr, | |
92efc152 | 1434 | &o2hb_region_attr_pid.attr, |
a7f6a5fb MF |
1435 | NULL, |
1436 | }; | |
1437 | ||
1438 | static ssize_t o2hb_region_show(struct config_item *item, | |
1439 | struct configfs_attribute *attr, | |
1440 | char *page) | |
1441 | { | |
1442 | struct o2hb_region *reg = to_o2hb_region(item); | |
1443 | struct o2hb_region_attribute *o2hb_region_attr = | |
1444 | container_of(attr, struct o2hb_region_attribute, attr); | |
1445 | ssize_t ret = 0; | |
1446 | ||
1447 | if (o2hb_region_attr->show) | |
1448 | ret = o2hb_region_attr->show(reg, page); | |
1449 | return ret; | |
1450 | } | |
1451 | ||
1452 | static ssize_t o2hb_region_store(struct config_item *item, | |
1453 | struct configfs_attribute *attr, | |
1454 | const char *page, size_t count) | |
1455 | { | |
1456 | struct o2hb_region *reg = to_o2hb_region(item); | |
1457 | struct o2hb_region_attribute *o2hb_region_attr = | |
1458 | container_of(attr, struct o2hb_region_attribute, attr); | |
1459 | ssize_t ret = -EINVAL; | |
1460 | ||
1461 | if (o2hb_region_attr->store) | |
1462 | ret = o2hb_region_attr->store(reg, page, count); | |
1463 | return ret; | |
1464 | } | |
1465 | ||
1466 | static struct configfs_item_operations o2hb_region_item_ops = { | |
1467 | .release = o2hb_region_release, | |
1468 | .show_attribute = o2hb_region_show, | |
1469 | .store_attribute = o2hb_region_store, | |
1470 | }; | |
1471 | ||
1472 | static struct config_item_type o2hb_region_type = { | |
1473 | .ct_item_ops = &o2hb_region_item_ops, | |
1474 | .ct_attrs = o2hb_region_attrs, | |
1475 | .ct_owner = THIS_MODULE, | |
1476 | }; | |
1477 | ||
1478 | /* heartbeat set */ | |
1479 | ||
1480 | struct o2hb_heartbeat_group { | |
1481 | struct config_group hs_group; | |
1482 | /* some stuff? */ | |
1483 | }; | |
1484 | ||
1485 | static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) | |
1486 | { | |
1487 | return group ? | |
1488 | container_of(group, struct o2hb_heartbeat_group, hs_group) | |
1489 | : NULL; | |
1490 | } | |
1491 | ||
f89ab861 JB |
1492 | static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, |
1493 | const char *name) | |
a7f6a5fb MF |
1494 | { |
1495 | struct o2hb_region *reg = NULL; | |
a7f6a5fb | 1496 | |
cd861280 | 1497 | reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL); |
f89ab861 | 1498 | if (reg == NULL) |
a6795e9e | 1499 | return ERR_PTR(-ENOMEM); |
a7f6a5fb MF |
1500 | |
1501 | config_item_init_type_name(®->hr_item, name, &o2hb_region_type); | |
1502 | ||
a7f6a5fb MF |
1503 | spin_lock(&o2hb_live_lock); |
1504 | list_add_tail(®->hr_all_item, &o2hb_all_regions); | |
1505 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb | 1506 | |
a6795e9e | 1507 | return ®->hr_item; |
a7f6a5fb MF |
1508 | } |
1509 | ||
1510 | static void o2hb_heartbeat_group_drop_item(struct config_group *group, | |
1511 | struct config_item *item) | |
1512 | { | |
e6c352db | 1513 | struct task_struct *hb_task; |
a7f6a5fb MF |
1514 | struct o2hb_region *reg = to_o2hb_region(item); |
1515 | ||
1516 | /* stop the thread when the user removes the region dir */ | |
e6c352db JB |
1517 | spin_lock(&o2hb_live_lock); |
1518 | hb_task = reg->hr_task; | |
1519 | reg->hr_task = NULL; | |
1520 | spin_unlock(&o2hb_live_lock); | |
1521 | ||
1522 | if (hb_task) | |
1523 | kthread_stop(hb_task); | |
a7f6a5fb | 1524 | |
e6df3a66 JB |
1525 | /* |
1526 | * If we're racing a dev_write(), we need to wake them. They will | |
1527 | * check reg->hr_task | |
1528 | */ | |
1529 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
1530 | atomic_set(®->hr_steady_iterations, 0); | |
1531 | wake_up(&o2hb_steady_queue); | |
1532 | } | |
1533 | ||
a7f6a5fb MF |
1534 | config_item_put(item); |
1535 | } | |
1536 | ||
1537 | struct o2hb_heartbeat_group_attribute { | |
1538 | struct configfs_attribute attr; | |
1539 | ssize_t (*show)(struct o2hb_heartbeat_group *, char *); | |
1540 | ssize_t (*store)(struct o2hb_heartbeat_group *, const char *, size_t); | |
1541 | }; | |
1542 | ||
1543 | static ssize_t o2hb_heartbeat_group_show(struct config_item *item, | |
1544 | struct configfs_attribute *attr, | |
1545 | char *page) | |
1546 | { | |
1547 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
1548 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
1549 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
1550 | ssize_t ret = 0; | |
1551 | ||
1552 | if (o2hb_heartbeat_group_attr->show) | |
1553 | ret = o2hb_heartbeat_group_attr->show(reg, page); | |
1554 | return ret; | |
1555 | } | |
1556 | ||
1557 | static ssize_t o2hb_heartbeat_group_store(struct config_item *item, | |
1558 | struct configfs_attribute *attr, | |
1559 | const char *page, size_t count) | |
1560 | { | |
1561 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
1562 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
1563 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
1564 | ssize_t ret = -EINVAL; | |
1565 | ||
1566 | if (o2hb_heartbeat_group_attr->store) | |
1567 | ret = o2hb_heartbeat_group_attr->store(reg, page, count); | |
1568 | return ret; | |
1569 | } | |
1570 | ||
1571 | static ssize_t o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group *group, | |
1572 | char *page) | |
1573 | { | |
1574 | return sprintf(page, "%u\n", o2hb_dead_threshold); | |
1575 | } | |
1576 | ||
1577 | static ssize_t o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group *group, | |
1578 | const char *page, | |
1579 | size_t count) | |
1580 | { | |
1581 | unsigned long tmp; | |
1582 | char *p = (char *)page; | |
1583 | ||
1584 | tmp = simple_strtoul(p, &p, 10); | |
1585 | if (!p || (*p && (*p != '\n'))) | |
1586 | return -EINVAL; | |
1587 | ||
1588 | /* this will validate ranges for us. */ | |
1589 | o2hb_dead_threshold_set((unsigned int) tmp); | |
1590 | ||
1591 | return count; | |
1592 | } | |
1593 | ||
1594 | static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold = { | |
1595 | .attr = { .ca_owner = THIS_MODULE, | |
1596 | .ca_name = "dead_threshold", | |
1597 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1598 | .show = o2hb_heartbeat_group_threshold_show, | |
1599 | .store = o2hb_heartbeat_group_threshold_store, | |
1600 | }; | |
1601 | ||
1602 | static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { | |
1603 | &o2hb_heartbeat_group_attr_threshold.attr, | |
1604 | NULL, | |
1605 | }; | |
1606 | ||
1607 | static struct configfs_item_operations o2hb_hearbeat_group_item_ops = { | |
1608 | .show_attribute = o2hb_heartbeat_group_show, | |
1609 | .store_attribute = o2hb_heartbeat_group_store, | |
1610 | }; | |
1611 | ||
1612 | static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { | |
1613 | .make_item = o2hb_heartbeat_group_make_item, | |
1614 | .drop_item = o2hb_heartbeat_group_drop_item, | |
1615 | }; | |
1616 | ||
1617 | static struct config_item_type o2hb_heartbeat_group_type = { | |
1618 | .ct_group_ops = &o2hb_heartbeat_group_group_ops, | |
1619 | .ct_item_ops = &o2hb_hearbeat_group_item_ops, | |
1620 | .ct_attrs = o2hb_heartbeat_group_attrs, | |
1621 | .ct_owner = THIS_MODULE, | |
1622 | }; | |
1623 | ||
1624 | /* this is just here to avoid touching group in heartbeat.h which the | |
1625 | * entire damn world #includes */ | |
1626 | struct config_group *o2hb_alloc_hb_set(void) | |
1627 | { | |
1628 | struct o2hb_heartbeat_group *hs = NULL; | |
1629 | struct config_group *ret = NULL; | |
1630 | ||
cd861280 | 1631 | hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); |
a7f6a5fb MF |
1632 | if (hs == NULL) |
1633 | goto out; | |
1634 | ||
1635 | config_group_init_type_name(&hs->hs_group, "heartbeat", | |
1636 | &o2hb_heartbeat_group_type); | |
1637 | ||
1638 | ret = &hs->hs_group; | |
1639 | out: | |
1640 | if (ret == NULL) | |
1641 | kfree(hs); | |
1642 | return ret; | |
1643 | } | |
1644 | ||
1645 | void o2hb_free_hb_set(struct config_group *group) | |
1646 | { | |
1647 | struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); | |
1648 | kfree(hs); | |
1649 | } | |
1650 | ||
1651 | /* hb callback registration and issueing */ | |
1652 | ||
1653 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) | |
1654 | { | |
1655 | if (type == O2HB_NUM_CB) | |
1656 | return ERR_PTR(-EINVAL); | |
1657 | ||
1658 | return &o2hb_callbacks[type]; | |
1659 | } | |
1660 | ||
1661 | void o2hb_setup_callback(struct o2hb_callback_func *hc, | |
1662 | enum o2hb_callback_type type, | |
1663 | o2hb_cb_func *func, | |
1664 | void *data, | |
1665 | int priority) | |
1666 | { | |
1667 | INIT_LIST_HEAD(&hc->hc_item); | |
1668 | hc->hc_func = func; | |
1669 | hc->hc_data = data; | |
1670 | hc->hc_priority = priority; | |
1671 | hc->hc_type = type; | |
1672 | hc->hc_magic = O2HB_CB_MAGIC; | |
1673 | } | |
1674 | EXPORT_SYMBOL_GPL(o2hb_setup_callback); | |
1675 | ||
14829422 JB |
1676 | static struct o2hb_region *o2hb_find_region(const char *region_uuid) |
1677 | { | |
1678 | struct o2hb_region *p, *reg = NULL; | |
1679 | ||
1680 | assert_spin_locked(&o2hb_live_lock); | |
1681 | ||
1682 | list_for_each_entry(p, &o2hb_all_regions, hr_all_item) { | |
1683 | if (!strcmp(region_uuid, config_item_name(&p->hr_item))) { | |
1684 | reg = p; | |
1685 | break; | |
1686 | } | |
1687 | } | |
1688 | ||
1689 | return reg; | |
1690 | } | |
1691 | ||
1692 | static int o2hb_region_get(const char *region_uuid) | |
1693 | { | |
1694 | int ret = 0; | |
1695 | struct o2hb_region *reg; | |
1696 | ||
1697 | spin_lock(&o2hb_live_lock); | |
1698 | ||
1699 | reg = o2hb_find_region(region_uuid); | |
1700 | if (!reg) | |
1701 | ret = -ENOENT; | |
1702 | spin_unlock(&o2hb_live_lock); | |
1703 | ||
16c6a4f2 JB |
1704 | if (ret) |
1705 | goto out; | |
1706 | ||
1707 | ret = o2nm_depend_this_node(); | |
1708 | if (ret) | |
1709 | goto out; | |
14829422 | 1710 | |
16c6a4f2 JB |
1711 | ret = o2nm_depend_item(®->hr_item); |
1712 | if (ret) | |
1713 | o2nm_undepend_this_node(); | |
1714 | ||
1715 | out: | |
14829422 JB |
1716 | return ret; |
1717 | } | |
1718 | ||
1719 | static void o2hb_region_put(const char *region_uuid) | |
1720 | { | |
1721 | struct o2hb_region *reg; | |
1722 | ||
1723 | spin_lock(&o2hb_live_lock); | |
1724 | ||
1725 | reg = o2hb_find_region(region_uuid); | |
1726 | ||
1727 | spin_unlock(&o2hb_live_lock); | |
1728 | ||
16c6a4f2 | 1729 | if (reg) { |
14829422 | 1730 | o2nm_undepend_item(®->hr_item); |
16c6a4f2 JB |
1731 | o2nm_undepend_this_node(); |
1732 | } | |
14829422 JB |
1733 | } |
1734 | ||
1735 | int o2hb_register_callback(const char *region_uuid, | |
1736 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
1737 | { |
1738 | struct o2hb_callback_func *tmp; | |
1739 | struct list_head *iter; | |
1740 | struct o2hb_callback *hbcall; | |
1741 | int ret; | |
1742 | ||
1743 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
1744 | BUG_ON(!list_empty(&hc->hc_item)); | |
1745 | ||
1746 | hbcall = hbcall_from_type(hc->hc_type); | |
1747 | if (IS_ERR(hbcall)) { | |
1748 | ret = PTR_ERR(hbcall); | |
1749 | goto out; | |
1750 | } | |
1751 | ||
14829422 JB |
1752 | if (region_uuid) { |
1753 | ret = o2hb_region_get(region_uuid); | |
1754 | if (ret) | |
1755 | goto out; | |
1756 | } | |
1757 | ||
a7f6a5fb MF |
1758 | down_write(&o2hb_callback_sem); |
1759 | ||
1760 | list_for_each(iter, &hbcall->list) { | |
1761 | tmp = list_entry(iter, struct o2hb_callback_func, hc_item); | |
1762 | if (hc->hc_priority < tmp->hc_priority) { | |
1763 | list_add_tail(&hc->hc_item, iter); | |
1764 | break; | |
1765 | } | |
1766 | } | |
1767 | if (list_empty(&hc->hc_item)) | |
1768 | list_add_tail(&hc->hc_item, &hbcall->list); | |
1769 | ||
1770 | up_write(&o2hb_callback_sem); | |
1771 | ret = 0; | |
1772 | out: | |
1773 | mlog(ML_HEARTBEAT, "returning %d on behalf of %p for funcs %p\n", | |
1774 | ret, __builtin_return_address(0), hc); | |
1775 | return ret; | |
1776 | } | |
1777 | EXPORT_SYMBOL_GPL(o2hb_register_callback); | |
1778 | ||
14829422 JB |
1779 | void o2hb_unregister_callback(const char *region_uuid, |
1780 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
1781 | { |
1782 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
1783 | ||
1784 | mlog(ML_HEARTBEAT, "on behalf of %p for funcs %p\n", | |
1785 | __builtin_return_address(0), hc); | |
1786 | ||
14829422 | 1787 | /* XXX Can this happen _with_ a region reference? */ |
a7f6a5fb | 1788 | if (list_empty(&hc->hc_item)) |
c24f72cc | 1789 | return; |
a7f6a5fb | 1790 | |
14829422 JB |
1791 | if (region_uuid) |
1792 | o2hb_region_put(region_uuid); | |
1793 | ||
a7f6a5fb MF |
1794 | down_write(&o2hb_callback_sem); |
1795 | ||
1796 | list_del_init(&hc->hc_item); | |
1797 | ||
1798 | up_write(&o2hb_callback_sem); | |
a7f6a5fb MF |
1799 | } |
1800 | EXPORT_SYMBOL_GPL(o2hb_unregister_callback); | |
1801 | ||
1802 | int o2hb_check_node_heartbeating(u8 node_num) | |
1803 | { | |
1804 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1805 | ||
1806 | o2hb_fill_node_map(testing_map, sizeof(testing_map)); | |
1807 | if (!test_bit(node_num, testing_map)) { | |
1808 | mlog(ML_HEARTBEAT, | |
1809 | "node (%u) does not have heartbeating enabled.\n", | |
1810 | node_num); | |
1811 | return 0; | |
1812 | } | |
1813 | ||
1814 | return 1; | |
1815 | } | |
1816 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating); | |
1817 | ||
1818 | int o2hb_check_node_heartbeating_from_callback(u8 node_num) | |
1819 | { | |
1820 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1821 | ||
1822 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); | |
1823 | if (!test_bit(node_num, testing_map)) { | |
1824 | mlog(ML_HEARTBEAT, | |
1825 | "node (%u) does not have heartbeating enabled.\n", | |
1826 | node_num); | |
1827 | return 0; | |
1828 | } | |
1829 | ||
1830 | return 1; | |
1831 | } | |
1832 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); | |
1833 | ||
1834 | /* Makes sure our local node is configured with a node number, and is | |
1835 | * heartbeating. */ | |
1836 | int o2hb_check_local_node_heartbeating(void) | |
1837 | { | |
1838 | u8 node_num; | |
1839 | ||
1840 | /* if this node was set then we have networking */ | |
1841 | node_num = o2nm_this_node(); | |
1842 | if (node_num == O2NM_MAX_NODES) { | |
1843 | mlog(ML_HEARTBEAT, "this node has not been configured.\n"); | |
1844 | return 0; | |
1845 | } | |
1846 | ||
1847 | return o2hb_check_node_heartbeating(node_num); | |
1848 | } | |
1849 | EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating); | |
1850 | ||
1851 | /* | |
1852 | * this is just a hack until we get the plumbing which flips file systems | |
1853 | * read only and drops the hb ref instead of killing the node dead. | |
1854 | */ | |
1855 | void o2hb_stop_all_regions(void) | |
1856 | { | |
1857 | struct o2hb_region *reg; | |
1858 | ||
1859 | mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); | |
1860 | ||
1861 | spin_lock(&o2hb_live_lock); | |
1862 | ||
1863 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) | |
1864 | reg->hr_unclean_stop = 1; | |
1865 | ||
1866 | spin_unlock(&o2hb_live_lock); | |
1867 | } | |
1868 | EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); |