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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> | |
87d3d3f3 | 36 | #include <linux/debugfs.h> |
a7f6a5fb MF |
37 | |
38 | #include "heartbeat.h" | |
39 | #include "tcp.h" | |
40 | #include "nodemanager.h" | |
41 | #include "quorum.h" | |
42 | ||
43 | #include "masklog.h" | |
44 | ||
45 | ||
46 | /* | |
47 | * The first heartbeat pass had one global thread that would serialize all hb | |
48 | * callback calls. This global serializing sem should only be removed once | |
49 | * we've made sure that all callees can deal with being called concurrently | |
50 | * from multiple hb region threads. | |
51 | */ | |
52 | static DECLARE_RWSEM(o2hb_callback_sem); | |
53 | ||
54 | /* | |
55 | * multiple hb threads are watching multiple regions. A node is live | |
56 | * whenever any of the threads sees activity from the node in its region. | |
57 | */ | |
34af946a | 58 | static DEFINE_SPINLOCK(o2hb_live_lock); |
a7f6a5fb MF |
59 | static struct list_head o2hb_live_slots[O2NM_MAX_NODES]; |
60 | static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
61 | static LIST_HEAD(o2hb_node_events); | |
62 | static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue); | |
63 | ||
87d3d3f3 SM |
64 | #define O2HB_DEBUG_DIR "o2hb" |
65 | #define O2HB_DEBUG_LIVENODES "livenodes" | |
66 | static struct dentry *o2hb_debug_dir; | |
67 | static struct dentry *o2hb_debug_livenodes; | |
68 | ||
a7f6a5fb MF |
69 | static LIST_HEAD(o2hb_all_regions); |
70 | ||
71 | static struct o2hb_callback { | |
72 | struct list_head list; | |
73 | } o2hb_callbacks[O2HB_NUM_CB]; | |
74 | ||
75 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type); | |
76 | ||
77 | #define O2HB_DEFAULT_BLOCK_BITS 9 | |
78 | ||
79 | unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD; | |
80 | ||
81 | /* Only sets a new threshold if there are no active regions. | |
82 | * | |
83 | * No locking or otherwise interesting code is required for reading | |
84 | * o2hb_dead_threshold as it can't change once regions are active and | |
85 | * it's not interesting to anyone until then anyway. */ | |
86 | static void o2hb_dead_threshold_set(unsigned int threshold) | |
87 | { | |
88 | if (threshold > O2HB_MIN_DEAD_THRESHOLD) { | |
89 | spin_lock(&o2hb_live_lock); | |
90 | if (list_empty(&o2hb_all_regions)) | |
91 | o2hb_dead_threshold = threshold; | |
92 | spin_unlock(&o2hb_live_lock); | |
93 | } | |
94 | } | |
95 | ||
96 | struct o2hb_node_event { | |
97 | struct list_head hn_item; | |
98 | enum o2hb_callback_type hn_event_type; | |
99 | struct o2nm_node *hn_node; | |
100 | int hn_node_num; | |
101 | }; | |
102 | ||
103 | struct o2hb_disk_slot { | |
104 | struct o2hb_disk_heartbeat_block *ds_raw_block; | |
105 | u8 ds_node_num; | |
106 | u64 ds_last_time; | |
107 | u64 ds_last_generation; | |
108 | u16 ds_equal_samples; | |
109 | u16 ds_changed_samples; | |
110 | struct list_head ds_live_item; | |
111 | }; | |
112 | ||
113 | /* each thread owns a region.. when we're asked to tear down the region | |
114 | * we ask the thread to stop, who cleans up the region */ | |
115 | struct o2hb_region { | |
116 | struct config_item hr_item; | |
117 | ||
118 | struct list_head hr_all_item; | |
119 | unsigned hr_unclean_stop:1; | |
120 | ||
121 | /* protected by the hr_callback_sem */ | |
122 | struct task_struct *hr_task; | |
123 | ||
124 | unsigned int hr_blocks; | |
125 | unsigned long long hr_start_block; | |
126 | ||
127 | unsigned int hr_block_bits; | |
128 | unsigned int hr_block_bytes; | |
129 | ||
130 | unsigned int hr_slots_per_page; | |
131 | unsigned int hr_num_pages; | |
132 | ||
133 | struct page **hr_slot_data; | |
134 | struct block_device *hr_bdev; | |
135 | struct o2hb_disk_slot *hr_slots; | |
136 | ||
137 | /* let the person setting up hb wait for it to return until it | |
138 | * has reached a 'steady' state. This will be fixed when we have | |
139 | * a more complete api that doesn't lead to this sort of fragility. */ | |
140 | atomic_t hr_steady_iterations; | |
141 | ||
142 | char hr_dev_name[BDEVNAME_SIZE]; | |
143 | ||
144 | unsigned int hr_timeout_ms; | |
145 | ||
146 | /* randomized as the region goes up and down so that a node | |
147 | * recognizes a node going up and down in one iteration */ | |
148 | u64 hr_generation; | |
149 | ||
c4028958 | 150 | struct delayed_work hr_write_timeout_work; |
a7f6a5fb MF |
151 | unsigned long hr_last_timeout_start; |
152 | ||
153 | /* Used during o2hb_check_slot to hold a copy of the block | |
154 | * being checked because we temporarily have to zero out the | |
155 | * crc field. */ | |
156 | struct o2hb_disk_heartbeat_block *hr_tmp_block; | |
157 | }; | |
158 | ||
159 | struct o2hb_bio_wait_ctxt { | |
160 | atomic_t wc_num_reqs; | |
161 | struct completion wc_io_complete; | |
a9e2ae39 | 162 | int wc_error; |
a7f6a5fb MF |
163 | }; |
164 | ||
c4028958 | 165 | static void o2hb_write_timeout(struct work_struct *work) |
a7f6a5fb | 166 | { |
c4028958 DH |
167 | struct o2hb_region *reg = |
168 | container_of(work, struct o2hb_region, | |
169 | hr_write_timeout_work.work); | |
a7f6a5fb MF |
170 | |
171 | mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u " | |
172 | "milliseconds\n", reg->hr_dev_name, | |
173 | jiffies_to_msecs(jiffies - reg->hr_last_timeout_start)); | |
174 | o2quo_disk_timeout(); | |
175 | } | |
176 | ||
177 | static void o2hb_arm_write_timeout(struct o2hb_region *reg) | |
178 | { | |
179 | mlog(0, "Queue write timeout for %u ms\n", O2HB_MAX_WRITE_TIMEOUT_MS); | |
180 | ||
181 | cancel_delayed_work(®->hr_write_timeout_work); | |
182 | reg->hr_last_timeout_start = jiffies; | |
183 | schedule_delayed_work(®->hr_write_timeout_work, | |
184 | msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS)); | |
185 | } | |
186 | ||
187 | static void o2hb_disarm_write_timeout(struct o2hb_region *reg) | |
188 | { | |
189 | cancel_delayed_work(®->hr_write_timeout_work); | |
190 | flush_scheduled_work(); | |
191 | } | |
192 | ||
b559292e | 193 | static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc) |
a7f6a5fb | 194 | { |
b559292e | 195 | atomic_set(&wc->wc_num_reqs, 1); |
a7f6a5fb | 196 | init_completion(&wc->wc_io_complete); |
a9e2ae39 | 197 | wc->wc_error = 0; |
a7f6a5fb MF |
198 | } |
199 | ||
200 | /* Used in error paths too */ | |
201 | static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc, | |
202 | unsigned int num) | |
203 | { | |
204 | /* sadly atomic_sub_and_test() isn't available on all platforms. The | |
205 | * good news is that the fast path only completes one at a time */ | |
206 | while(num--) { | |
207 | if (atomic_dec_and_test(&wc->wc_num_reqs)) { | |
208 | BUG_ON(num > 0); | |
209 | complete(&wc->wc_io_complete); | |
210 | } | |
211 | } | |
212 | } | |
213 | ||
214 | static void o2hb_wait_on_io(struct o2hb_region *reg, | |
215 | struct o2hb_bio_wait_ctxt *wc) | |
216 | { | |
217 | struct address_space *mapping = reg->hr_bdev->bd_inode->i_mapping; | |
218 | ||
219 | blk_run_address_space(mapping); | |
b559292e | 220 | o2hb_bio_wait_dec(wc, 1); |
a7f6a5fb MF |
221 | |
222 | wait_for_completion(&wc->wc_io_complete); | |
223 | } | |
224 | ||
782e3b3b | 225 | static void o2hb_bio_end_io(struct bio *bio, |
a7f6a5fb MF |
226 | int error) |
227 | { | |
228 | struct o2hb_bio_wait_ctxt *wc = bio->bi_private; | |
229 | ||
a9e2ae39 | 230 | if (error) { |
a7f6a5fb | 231 | mlog(ML_ERROR, "IO Error %d\n", error); |
a9e2ae39 MF |
232 | wc->wc_error = error; |
233 | } | |
a7f6a5fb | 234 | |
a7f6a5fb | 235 | o2hb_bio_wait_dec(wc, 1); |
b559292e | 236 | bio_put(bio); |
a7f6a5fb MF |
237 | } |
238 | ||
239 | /* Setup a Bio to cover I/O against num_slots slots starting at | |
240 | * start_slot. */ | |
241 | static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, | |
242 | struct o2hb_bio_wait_ctxt *wc, | |
b559292e PR |
243 | unsigned int *current_slot, |
244 | unsigned int max_slots) | |
a7f6a5fb | 245 | { |
b559292e | 246 | int len, current_page; |
a7f6a5fb MF |
247 | unsigned int vec_len, vec_start; |
248 | unsigned int bits = reg->hr_block_bits; | |
249 | unsigned int spp = reg->hr_slots_per_page; | |
b559292e | 250 | unsigned int cs = *current_slot; |
a7f6a5fb MF |
251 | struct bio *bio; |
252 | struct page *page; | |
253 | ||
a7f6a5fb MF |
254 | /* Testing has shown this allocation to take long enough under |
255 | * GFP_KERNEL that the local node can get fenced. It would be | |
256 | * nicest if we could pre-allocate these bios and avoid this | |
257 | * all together. */ | |
b559292e | 258 | bio = bio_alloc(GFP_ATOMIC, 16); |
a7f6a5fb MF |
259 | if (!bio) { |
260 | mlog(ML_ERROR, "Could not alloc slots BIO!\n"); | |
261 | bio = ERR_PTR(-ENOMEM); | |
262 | goto bail; | |
263 | } | |
264 | ||
265 | /* Must put everything in 512 byte sectors for the bio... */ | |
b559292e | 266 | bio->bi_sector = (reg->hr_start_block + cs) << (bits - 9); |
a7f6a5fb MF |
267 | bio->bi_bdev = reg->hr_bdev; |
268 | bio->bi_private = wc; | |
269 | bio->bi_end_io = o2hb_bio_end_io; | |
270 | ||
b559292e PR |
271 | vec_start = (cs << bits) % PAGE_CACHE_SIZE; |
272 | while(cs < max_slots) { | |
273 | current_page = cs / spp; | |
274 | page = reg->hr_slot_data[current_page]; | |
a7f6a5fb | 275 | |
bc7e97cb | 276 | vec_len = min(PAGE_CACHE_SIZE - vec_start, |
b559292e | 277 | (max_slots-cs) * (PAGE_CACHE_SIZE/spp) ); |
a7f6a5fb MF |
278 | |
279 | mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", | |
b559292e | 280 | current_page, vec_len, vec_start); |
a7f6a5fb MF |
281 | |
282 | len = bio_add_page(bio, page, vec_len, vec_start); | |
b559292e | 283 | if (len != vec_len) break; |
a7f6a5fb | 284 | |
b559292e | 285 | cs += vec_len / (PAGE_CACHE_SIZE/spp); |
a7f6a5fb MF |
286 | vec_start = 0; |
287 | } | |
288 | ||
289 | bail: | |
b559292e | 290 | *current_slot = cs; |
a7f6a5fb MF |
291 | return bio; |
292 | } | |
293 | ||
a7f6a5fb MF |
294 | static int o2hb_read_slots(struct o2hb_region *reg, |
295 | unsigned int max_slots) | |
296 | { | |
b559292e PR |
297 | unsigned int current_slot=0; |
298 | int status; | |
a7f6a5fb | 299 | struct o2hb_bio_wait_ctxt wc; |
a7f6a5fb MF |
300 | struct bio *bio; |
301 | ||
b559292e | 302 | o2hb_bio_wait_init(&wc); |
a7f6a5fb | 303 | |
b559292e PR |
304 | while(current_slot < max_slots) { |
305 | bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots); | |
a7f6a5fb | 306 | if (IS_ERR(bio)) { |
a7f6a5fb MF |
307 | status = PTR_ERR(bio); |
308 | mlog_errno(status); | |
309 | goto bail_and_wait; | |
310 | } | |
a7f6a5fb | 311 | |
b559292e | 312 | atomic_inc(&wc.wc_num_reqs); |
a7f6a5fb MF |
313 | submit_bio(READ, bio); |
314 | } | |
315 | ||
316 | status = 0; | |
317 | ||
318 | bail_and_wait: | |
319 | o2hb_wait_on_io(reg, &wc); | |
a9e2ae39 MF |
320 | if (wc.wc_error && !status) |
321 | status = wc.wc_error; | |
a7f6a5fb | 322 | |
a7f6a5fb MF |
323 | return status; |
324 | } | |
325 | ||
326 | static int o2hb_issue_node_write(struct o2hb_region *reg, | |
a7f6a5fb MF |
327 | struct o2hb_bio_wait_ctxt *write_wc) |
328 | { | |
329 | int status; | |
330 | unsigned int slot; | |
331 | struct bio *bio; | |
332 | ||
b559292e | 333 | o2hb_bio_wait_init(write_wc); |
a7f6a5fb MF |
334 | |
335 | slot = o2nm_this_node(); | |
336 | ||
b559292e | 337 | bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1); |
a7f6a5fb MF |
338 | if (IS_ERR(bio)) { |
339 | status = PTR_ERR(bio); | |
340 | mlog_errno(status); | |
341 | goto bail; | |
342 | } | |
343 | ||
b559292e | 344 | atomic_inc(&write_wc->wc_num_reqs); |
a7f6a5fb MF |
345 | submit_bio(WRITE, bio); |
346 | ||
a7f6a5fb MF |
347 | status = 0; |
348 | bail: | |
349 | return status; | |
350 | } | |
351 | ||
352 | static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, | |
353 | struct o2hb_disk_heartbeat_block *hb_block) | |
354 | { | |
355 | __le32 old_cksum; | |
356 | u32 ret; | |
357 | ||
358 | /* We want to compute the block crc with a 0 value in the | |
359 | * hb_cksum field. Save it off here and replace after the | |
360 | * crc. */ | |
361 | old_cksum = hb_block->hb_cksum; | |
362 | hb_block->hb_cksum = 0; | |
363 | ||
364 | ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); | |
365 | ||
366 | hb_block->hb_cksum = old_cksum; | |
367 | ||
368 | return ret; | |
369 | } | |
370 | ||
371 | static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) | |
372 | { | |
70bacbdb MF |
373 | mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, " |
374 | "cksum = 0x%x, generation 0x%llx\n", | |
375 | (long long)le64_to_cpu(hb_block->hb_seq), | |
376 | hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum), | |
377 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
378 | } |
379 | ||
380 | static int o2hb_verify_crc(struct o2hb_region *reg, | |
381 | struct o2hb_disk_heartbeat_block *hb_block) | |
382 | { | |
383 | u32 read, computed; | |
384 | ||
385 | read = le32_to_cpu(hb_block->hb_cksum); | |
386 | computed = o2hb_compute_block_crc_le(reg, hb_block); | |
387 | ||
388 | return read == computed; | |
389 | } | |
390 | ||
391 | /* We want to make sure that nobody is heartbeating on top of us -- | |
392 | * this will help detect an invalid configuration. */ | |
393 | static int o2hb_check_last_timestamp(struct o2hb_region *reg) | |
394 | { | |
395 | int node_num, ret; | |
396 | struct o2hb_disk_slot *slot; | |
397 | struct o2hb_disk_heartbeat_block *hb_block; | |
398 | ||
399 | node_num = o2nm_this_node(); | |
400 | ||
401 | ret = 1; | |
402 | slot = ®->hr_slots[node_num]; | |
403 | /* Don't check on our 1st timestamp */ | |
404 | if (slot->ds_last_time) { | |
405 | hb_block = slot->ds_raw_block; | |
406 | ||
407 | if (le64_to_cpu(hb_block->hb_seq) != slot->ds_last_time) | |
408 | ret = 0; | |
409 | } | |
410 | ||
411 | return ret; | |
412 | } | |
413 | ||
414 | static inline void o2hb_prepare_block(struct o2hb_region *reg, | |
415 | u64 generation) | |
416 | { | |
417 | int node_num; | |
418 | u64 cputime; | |
419 | struct o2hb_disk_slot *slot; | |
420 | struct o2hb_disk_heartbeat_block *hb_block; | |
421 | ||
422 | node_num = o2nm_this_node(); | |
423 | slot = ®->hr_slots[node_num]; | |
424 | ||
425 | hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; | |
426 | memset(hb_block, 0, reg->hr_block_bytes); | |
427 | /* TODO: time stuff */ | |
428 | cputime = CURRENT_TIME.tv_sec; | |
429 | if (!cputime) | |
430 | cputime = 1; | |
431 | ||
432 | hb_block->hb_seq = cpu_to_le64(cputime); | |
433 | hb_block->hb_node = node_num; | |
434 | hb_block->hb_generation = cpu_to_le64(generation); | |
0db638f4 | 435 | hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS); |
a7f6a5fb MF |
436 | |
437 | /* This step must always happen last! */ | |
438 | hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, | |
439 | hb_block)); | |
440 | ||
70bacbdb | 441 | mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n", |
5fdf1e67 | 442 | (long long)generation, |
70bacbdb | 443 | le32_to_cpu(hb_block->hb_cksum)); |
a7f6a5fb MF |
444 | } |
445 | ||
446 | static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, | |
447 | struct o2nm_node *node, | |
448 | int idx) | |
449 | { | |
450 | struct list_head *iter; | |
451 | struct o2hb_callback_func *f; | |
452 | ||
453 | list_for_each(iter, &hbcall->list) { | |
454 | f = list_entry(iter, struct o2hb_callback_func, hc_item); | |
455 | mlog(ML_HEARTBEAT, "calling funcs %p\n", f); | |
456 | (f->hc_func)(node, idx, f->hc_data); | |
457 | } | |
458 | } | |
459 | ||
460 | /* Will run the list in order until we process the passed event */ | |
461 | static void o2hb_run_event_list(struct o2hb_node_event *queued_event) | |
462 | { | |
463 | int empty; | |
464 | struct o2hb_callback *hbcall; | |
465 | struct o2hb_node_event *event; | |
466 | ||
467 | spin_lock(&o2hb_live_lock); | |
468 | empty = list_empty(&queued_event->hn_item); | |
469 | spin_unlock(&o2hb_live_lock); | |
470 | if (empty) | |
471 | return; | |
472 | ||
473 | /* Holding callback sem assures we don't alter the callback | |
474 | * lists when doing this, and serializes ourselves with other | |
475 | * processes wanting callbacks. */ | |
476 | down_write(&o2hb_callback_sem); | |
477 | ||
478 | spin_lock(&o2hb_live_lock); | |
479 | while (!list_empty(&o2hb_node_events) | |
480 | && !list_empty(&queued_event->hn_item)) { | |
481 | event = list_entry(o2hb_node_events.next, | |
482 | struct o2hb_node_event, | |
483 | hn_item); | |
484 | list_del_init(&event->hn_item); | |
485 | spin_unlock(&o2hb_live_lock); | |
486 | ||
487 | mlog(ML_HEARTBEAT, "Node %s event for %d\n", | |
488 | event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", | |
489 | event->hn_node_num); | |
490 | ||
491 | hbcall = hbcall_from_type(event->hn_event_type); | |
492 | ||
493 | /* We should *never* have gotten on to the list with a | |
494 | * bad type... This isn't something that we should try | |
495 | * to recover from. */ | |
496 | BUG_ON(IS_ERR(hbcall)); | |
497 | ||
498 | o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); | |
499 | ||
500 | spin_lock(&o2hb_live_lock); | |
501 | } | |
502 | spin_unlock(&o2hb_live_lock); | |
503 | ||
504 | up_write(&o2hb_callback_sem); | |
505 | } | |
506 | ||
507 | static void o2hb_queue_node_event(struct o2hb_node_event *event, | |
508 | enum o2hb_callback_type type, | |
509 | struct o2nm_node *node, | |
510 | int node_num) | |
511 | { | |
512 | assert_spin_locked(&o2hb_live_lock); | |
513 | ||
514 | event->hn_event_type = type; | |
515 | event->hn_node = node; | |
516 | event->hn_node_num = node_num; | |
517 | ||
518 | mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", | |
519 | type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); | |
520 | ||
521 | list_add_tail(&event->hn_item, &o2hb_node_events); | |
522 | } | |
523 | ||
524 | static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) | |
525 | { | |
526 | struct o2hb_node_event event = | |
527 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
528 | struct o2nm_node *node; | |
529 | ||
530 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
531 | if (!node) | |
532 | return; | |
533 | ||
534 | spin_lock(&o2hb_live_lock); | |
535 | if (!list_empty(&slot->ds_live_item)) { | |
536 | mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", | |
537 | slot->ds_node_num); | |
538 | ||
539 | list_del_init(&slot->ds_live_item); | |
540 | ||
541 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
542 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
543 | ||
544 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
545 | slot->ds_node_num); | |
546 | } | |
547 | } | |
548 | spin_unlock(&o2hb_live_lock); | |
549 | ||
550 | o2hb_run_event_list(&event); | |
551 | ||
552 | o2nm_node_put(node); | |
553 | } | |
554 | ||
555 | static int o2hb_check_slot(struct o2hb_region *reg, | |
556 | struct o2hb_disk_slot *slot) | |
557 | { | |
558 | int changed = 0, gen_changed = 0; | |
559 | struct o2hb_node_event event = | |
560 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
561 | struct o2nm_node *node; | |
562 | struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; | |
563 | u64 cputime; | |
0db638f4 MF |
564 | unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS; |
565 | unsigned int slot_dead_ms; | |
a7f6a5fb MF |
566 | |
567 | memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); | |
568 | ||
569 | /* Is this correct? Do we assume that the node doesn't exist | |
570 | * if we're not configured for him? */ | |
571 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
572 | if (!node) | |
573 | return 0; | |
574 | ||
575 | if (!o2hb_verify_crc(reg, hb_block)) { | |
576 | /* all paths from here will drop o2hb_live_lock for | |
577 | * us. */ | |
578 | spin_lock(&o2hb_live_lock); | |
579 | ||
580 | /* Don't print an error on the console in this case - | |
581 | * a freshly formatted heartbeat area will not have a | |
582 | * crc set on it. */ | |
583 | if (list_empty(&slot->ds_live_item)) | |
584 | goto out; | |
585 | ||
586 | /* The node is live but pushed out a bad crc. We | |
587 | * consider it a transient miss but don't populate any | |
588 | * other values as they may be junk. */ | |
589 | mlog(ML_ERROR, "Node %d has written a bad crc to %s\n", | |
590 | slot->ds_node_num, reg->hr_dev_name); | |
591 | o2hb_dump_slot(hb_block); | |
592 | ||
593 | slot->ds_equal_samples++; | |
594 | goto fire_callbacks; | |
595 | } | |
596 | ||
597 | /* we don't care if these wrap.. the state transitions below | |
598 | * clear at the right places */ | |
599 | cputime = le64_to_cpu(hb_block->hb_seq); | |
600 | if (slot->ds_last_time != cputime) | |
601 | slot->ds_changed_samples++; | |
602 | else | |
603 | slot->ds_equal_samples++; | |
604 | slot->ds_last_time = cputime; | |
605 | ||
606 | /* The node changed heartbeat generations. We assume this to | |
607 | * mean it dropped off but came back before we timed out. We | |
608 | * want to consider it down for the time being but don't want | |
609 | * to lose any changed_samples state we might build up to | |
610 | * considering it live again. */ | |
611 | if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { | |
612 | gen_changed = 1; | |
613 | slot->ds_equal_samples = 0; | |
70bacbdb MF |
614 | mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx " |
615 | "to 0x%llx)\n", slot->ds_node_num, | |
616 | (long long)slot->ds_last_generation, | |
617 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
618 | } |
619 | ||
620 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
621 | ||
70bacbdb MF |
622 | mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x " |
623 | "seq %llu last %llu changed %u equal %u\n", | |
624 | slot->ds_node_num, (long long)slot->ds_last_generation, | |
625 | le32_to_cpu(hb_block->hb_cksum), | |
626 | (unsigned long long)le64_to_cpu(hb_block->hb_seq), | |
627 | (unsigned long long)slot->ds_last_time, slot->ds_changed_samples, | |
a7f6a5fb MF |
628 | slot->ds_equal_samples); |
629 | ||
630 | spin_lock(&o2hb_live_lock); | |
631 | ||
632 | fire_callbacks: | |
633 | /* dead nodes only come to life after some number of | |
634 | * changes at any time during their dead time */ | |
635 | if (list_empty(&slot->ds_live_item) && | |
636 | slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { | |
70bacbdb MF |
637 | mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n", |
638 | slot->ds_node_num, (long long)slot->ds_last_generation); | |
a7f6a5fb MF |
639 | |
640 | /* first on the list generates a callback */ | |
641 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
642 | set_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
643 | ||
644 | o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, | |
645 | slot->ds_node_num); | |
646 | ||
647 | changed = 1; | |
648 | } | |
649 | ||
650 | list_add_tail(&slot->ds_live_item, | |
651 | &o2hb_live_slots[slot->ds_node_num]); | |
652 | ||
653 | slot->ds_equal_samples = 0; | |
0db638f4 MF |
654 | |
655 | /* We want to be sure that all nodes agree on the | |
656 | * number of milliseconds before a node will be | |
657 | * considered dead. The self-fencing timeout is | |
658 | * computed from this value, and a discrepancy might | |
659 | * result in heartbeat calling a node dead when it | |
660 | * hasn't self-fenced yet. */ | |
661 | slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms); | |
662 | if (slot_dead_ms && slot_dead_ms != dead_ms) { | |
663 | /* TODO: Perhaps we can fail the region here. */ | |
664 | mlog(ML_ERROR, "Node %d on device %s has a dead count " | |
665 | "of %u ms, but our count is %u ms.\n" | |
666 | "Please double check your configuration values " | |
667 | "for 'O2CB_HEARTBEAT_THRESHOLD'\n", | |
668 | slot->ds_node_num, reg->hr_dev_name, slot_dead_ms, | |
669 | dead_ms); | |
670 | } | |
a7f6a5fb MF |
671 | goto out; |
672 | } | |
673 | ||
674 | /* if the list is dead, we're done.. */ | |
675 | if (list_empty(&slot->ds_live_item)) | |
676 | goto out; | |
677 | ||
678 | /* live nodes only go dead after enough consequtive missed | |
679 | * samples.. reset the missed counter whenever we see | |
680 | * activity */ | |
681 | if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { | |
682 | mlog(ML_HEARTBEAT, "Node %d left my region\n", | |
683 | slot->ds_node_num); | |
684 | ||
685 | /* last off the live_slot generates a callback */ | |
686 | list_del_init(&slot->ds_live_item); | |
687 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
688 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
689 | ||
690 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
691 | slot->ds_node_num); | |
692 | ||
693 | changed = 1; | |
694 | } | |
695 | ||
696 | /* We don't clear this because the node is still | |
697 | * actually writing new blocks. */ | |
698 | if (!gen_changed) | |
699 | slot->ds_changed_samples = 0; | |
700 | goto out; | |
701 | } | |
702 | if (slot->ds_changed_samples) { | |
703 | slot->ds_changed_samples = 0; | |
704 | slot->ds_equal_samples = 0; | |
705 | } | |
706 | out: | |
707 | spin_unlock(&o2hb_live_lock); | |
708 | ||
709 | o2hb_run_event_list(&event); | |
710 | ||
711 | o2nm_node_put(node); | |
712 | return changed; | |
713 | } | |
714 | ||
715 | /* This could be faster if we just implmented a find_last_bit, but I | |
716 | * don't think the circumstances warrant it. */ | |
717 | static int o2hb_highest_node(unsigned long *nodes, | |
718 | int numbits) | |
719 | { | |
720 | int highest, node; | |
721 | ||
722 | highest = numbits; | |
723 | node = -1; | |
724 | while ((node = find_next_bit(nodes, numbits, node + 1)) != -1) { | |
725 | if (node >= numbits) | |
726 | break; | |
727 | ||
728 | highest = node; | |
729 | } | |
730 | ||
731 | return highest; | |
732 | } | |
733 | ||
a9e2ae39 | 734 | static int o2hb_do_disk_heartbeat(struct o2hb_region *reg) |
a7f6a5fb MF |
735 | { |
736 | int i, ret, highest_node, change = 0; | |
737 | unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
a7f6a5fb MF |
738 | struct o2hb_bio_wait_ctxt write_wc; |
739 | ||
a9e2ae39 MF |
740 | ret = o2nm_configured_node_map(configured_nodes, |
741 | sizeof(configured_nodes)); | |
742 | if (ret) { | |
743 | mlog_errno(ret); | |
744 | return ret; | |
745 | } | |
a7f6a5fb MF |
746 | |
747 | highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); | |
748 | if (highest_node >= O2NM_MAX_NODES) { | |
749 | mlog(ML_NOTICE, "ocfs2_heartbeat: no configured nodes found!\n"); | |
a9e2ae39 | 750 | return -EINVAL; |
a7f6a5fb MF |
751 | } |
752 | ||
753 | /* No sense in reading the slots of nodes that don't exist | |
754 | * yet. Of course, if the node definitions have holes in them | |
755 | * then we're reading an empty slot anyway... Consider this | |
756 | * best-effort. */ | |
757 | ret = o2hb_read_slots(reg, highest_node + 1); | |
758 | if (ret < 0) { | |
759 | mlog_errno(ret); | |
a9e2ae39 | 760 | return ret; |
a7f6a5fb MF |
761 | } |
762 | ||
763 | /* With an up to date view of the slots, we can check that no | |
764 | * other node has been improperly configured to heartbeat in | |
765 | * our slot. */ | |
766 | if (!o2hb_check_last_timestamp(reg)) | |
767 | mlog(ML_ERROR, "Device \"%s\": another node is heartbeating " | |
768 | "in our slot!\n", reg->hr_dev_name); | |
769 | ||
770 | /* fill in the proper info for our next heartbeat */ | |
771 | o2hb_prepare_block(reg, reg->hr_generation); | |
772 | ||
773 | /* And fire off the write. Note that we don't wait on this I/O | |
774 | * until later. */ | |
b559292e | 775 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
776 | if (ret < 0) { |
777 | mlog_errno(ret); | |
a9e2ae39 | 778 | return ret; |
a7f6a5fb MF |
779 | } |
780 | ||
781 | i = -1; | |
782 | while((i = find_next_bit(configured_nodes, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
783 | ||
784 | change |= o2hb_check_slot(reg, ®->hr_slots[i]); | |
785 | } | |
786 | ||
787 | /* | |
788 | * We have to be sure we've advertised ourselves on disk | |
789 | * before we can go to steady state. This ensures that | |
790 | * people we find in our steady state have seen us. | |
791 | */ | |
792 | o2hb_wait_on_io(reg, &write_wc); | |
a9e2ae39 MF |
793 | if (write_wc.wc_error) { |
794 | /* Do not re-arm the write timeout on I/O error - we | |
795 | * can't be sure that the new block ever made it to | |
796 | * disk */ | |
797 | mlog(ML_ERROR, "Write error %d on device \"%s\"\n", | |
798 | write_wc.wc_error, reg->hr_dev_name); | |
799 | return write_wc.wc_error; | |
800 | } | |
801 | ||
a7f6a5fb MF |
802 | o2hb_arm_write_timeout(reg); |
803 | ||
804 | /* let the person who launched us know when things are steady */ | |
805 | if (!change && (atomic_read(®->hr_steady_iterations) != 0)) { | |
806 | if (atomic_dec_and_test(®->hr_steady_iterations)) | |
807 | wake_up(&o2hb_steady_queue); | |
808 | } | |
a9e2ae39 MF |
809 | |
810 | return 0; | |
a7f6a5fb MF |
811 | } |
812 | ||
813 | /* Subtract b from a, storing the result in a. a *must* have a larger | |
814 | * value than b. */ | |
815 | static void o2hb_tv_subtract(struct timeval *a, | |
816 | struct timeval *b) | |
817 | { | |
818 | /* just return 0 when a is after b */ | |
819 | if (a->tv_sec < b->tv_sec || | |
820 | (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec)) { | |
821 | a->tv_sec = 0; | |
822 | a->tv_usec = 0; | |
823 | return; | |
824 | } | |
825 | ||
826 | a->tv_sec -= b->tv_sec; | |
827 | a->tv_usec -= b->tv_usec; | |
828 | while ( a->tv_usec < 0 ) { | |
829 | a->tv_sec--; | |
830 | a->tv_usec += 1000000; | |
831 | } | |
832 | } | |
833 | ||
834 | static unsigned int o2hb_elapsed_msecs(struct timeval *start, | |
835 | struct timeval *end) | |
836 | { | |
837 | struct timeval res = *end; | |
838 | ||
839 | o2hb_tv_subtract(&res, start); | |
840 | ||
841 | return res.tv_sec * 1000 + res.tv_usec / 1000; | |
842 | } | |
843 | ||
844 | /* | |
845 | * we ride the region ref that the region dir holds. before the region | |
846 | * dir is removed and drops it ref it will wait to tear down this | |
847 | * thread. | |
848 | */ | |
849 | static int o2hb_thread(void *data) | |
850 | { | |
851 | int i, ret; | |
852 | struct o2hb_region *reg = data; | |
a7f6a5fb MF |
853 | struct o2hb_bio_wait_ctxt write_wc; |
854 | struct timeval before_hb, after_hb; | |
855 | unsigned int elapsed_msec; | |
856 | ||
857 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); | |
858 | ||
859 | set_user_nice(current, -20); | |
860 | ||
861 | while (!kthread_should_stop() && !reg->hr_unclean_stop) { | |
862 | /* We track the time spent inside | |
025dfdaf | 863 | * o2hb_do_disk_heartbeat so that we avoid more than |
a7f6a5fb MF |
864 | * hr_timeout_ms between disk writes. On busy systems |
865 | * this should result in a heartbeat which is less | |
866 | * likely to time itself out. */ | |
867 | do_gettimeofday(&before_hb); | |
868 | ||
a9e2ae39 MF |
869 | i = 0; |
870 | do { | |
871 | ret = o2hb_do_disk_heartbeat(reg); | |
872 | } while (ret && ++i < 2); | |
a7f6a5fb MF |
873 | |
874 | do_gettimeofday(&after_hb); | |
875 | elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb); | |
876 | ||
877 | mlog(0, "start = %lu.%lu, end = %lu.%lu, msec = %u\n", | |
215c7f9f MF |
878 | before_hb.tv_sec, (unsigned long) before_hb.tv_usec, |
879 | after_hb.tv_sec, (unsigned long) after_hb.tv_usec, | |
880 | elapsed_msec); | |
a7f6a5fb MF |
881 | |
882 | if (elapsed_msec < reg->hr_timeout_ms) { | |
883 | /* the kthread api has blocked signals for us so no | |
884 | * need to record the return value. */ | |
885 | msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); | |
886 | } | |
887 | } | |
888 | ||
889 | o2hb_disarm_write_timeout(reg); | |
890 | ||
891 | /* unclean stop is only used in very bad situation */ | |
892 | for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) | |
893 | o2hb_shutdown_slot(®->hr_slots[i]); | |
894 | ||
895 | /* Explicit down notification - avoid forcing the other nodes | |
896 | * to timeout on this region when we could just as easily | |
897 | * write a clear generation - thus indicating to them that | |
898 | * this node has left this region. | |
899 | * | |
900 | * XXX: Should we skip this on unclean_stop? */ | |
901 | o2hb_prepare_block(reg, 0); | |
b559292e | 902 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
903 | if (ret == 0) { |
904 | o2hb_wait_on_io(reg, &write_wc); | |
a7f6a5fb MF |
905 | } else { |
906 | mlog_errno(ret); | |
907 | } | |
908 | ||
909 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread exiting\n"); | |
910 | ||
911 | return 0; | |
912 | } | |
913 | ||
87d3d3f3 SM |
914 | #ifdef CONFIG_DEBUG_FS |
915 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
916 | { | |
917 | unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
918 | char *buf = NULL; | |
919 | int i = -1; | |
920 | int out = 0; | |
921 | ||
922 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
923 | if (!buf) | |
924 | goto bail; | |
925 | ||
926 | o2hb_fill_node_map(map, sizeof(map)); | |
927 | ||
928 | while ((i = find_next_bit(map, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) | |
929 | out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i); | |
930 | out += snprintf(buf + out, PAGE_SIZE - out, "\n"); | |
931 | ||
932 | i_size_write(inode, out); | |
933 | ||
934 | file->private_data = buf; | |
935 | ||
936 | return 0; | |
937 | bail: | |
938 | return -ENOMEM; | |
939 | } | |
940 | ||
941 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
942 | { | |
943 | kfree(file->private_data); | |
944 | return 0; | |
945 | } | |
946 | ||
947 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
948 | size_t nbytes, loff_t *ppos) | |
949 | { | |
950 | return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, | |
951 | i_size_read(file->f_mapping->host)); | |
952 | } | |
953 | #else | |
954 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
955 | { | |
956 | return 0; | |
957 | } | |
958 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
959 | { | |
960 | return 0; | |
961 | } | |
962 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
963 | size_t nbytes, loff_t *ppos) | |
964 | { | |
965 | return 0; | |
966 | } | |
967 | #endif /* CONFIG_DEBUG_FS */ | |
968 | ||
828c0950 | 969 | static const struct file_operations o2hb_debug_fops = { |
87d3d3f3 SM |
970 | .open = o2hb_debug_open, |
971 | .release = o2hb_debug_release, | |
972 | .read = o2hb_debug_read, | |
973 | .llseek = generic_file_llseek, | |
974 | }; | |
975 | ||
976 | void o2hb_exit(void) | |
977 | { | |
978 | if (o2hb_debug_livenodes) | |
979 | debugfs_remove(o2hb_debug_livenodes); | |
980 | if (o2hb_debug_dir) | |
981 | debugfs_remove(o2hb_debug_dir); | |
982 | } | |
983 | ||
984 | int o2hb_init(void) | |
a7f6a5fb MF |
985 | { |
986 | int i; | |
987 | ||
988 | for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) | |
989 | INIT_LIST_HEAD(&o2hb_callbacks[i].list); | |
990 | ||
991 | for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) | |
992 | INIT_LIST_HEAD(&o2hb_live_slots[i]); | |
993 | ||
994 | INIT_LIST_HEAD(&o2hb_node_events); | |
995 | ||
996 | memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap)); | |
87d3d3f3 SM |
997 | |
998 | o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL); | |
999 | if (!o2hb_debug_dir) { | |
1000 | mlog_errno(-ENOMEM); | |
1001 | return -ENOMEM; | |
1002 | } | |
1003 | ||
1004 | o2hb_debug_livenodes = debugfs_create_file(O2HB_DEBUG_LIVENODES, | |
1005 | S_IFREG|S_IRUSR, | |
1006 | o2hb_debug_dir, NULL, | |
1007 | &o2hb_debug_fops); | |
1008 | if (!o2hb_debug_livenodes) { | |
1009 | mlog_errno(-ENOMEM); | |
1010 | debugfs_remove(o2hb_debug_dir); | |
1011 | return -ENOMEM; | |
1012 | } | |
1013 | ||
1014 | return 0; | |
a7f6a5fb MF |
1015 | } |
1016 | ||
1017 | /* if we're already in a callback then we're already serialized by the sem */ | |
1018 | static void o2hb_fill_node_map_from_callback(unsigned long *map, | |
1019 | unsigned bytes) | |
1020 | { | |
1021 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); | |
1022 | ||
1023 | memcpy(map, &o2hb_live_node_bitmap, bytes); | |
1024 | } | |
1025 | ||
1026 | /* | |
1027 | * get a map of all nodes that are heartbeating in any regions | |
1028 | */ | |
1029 | void o2hb_fill_node_map(unsigned long *map, unsigned bytes) | |
1030 | { | |
1031 | /* callers want to serialize this map and callbacks so that they | |
1032 | * can trust that they don't miss nodes coming to the party */ | |
1033 | down_read(&o2hb_callback_sem); | |
1034 | spin_lock(&o2hb_live_lock); | |
1035 | o2hb_fill_node_map_from_callback(map, bytes); | |
1036 | spin_unlock(&o2hb_live_lock); | |
1037 | up_read(&o2hb_callback_sem); | |
1038 | } | |
1039 | EXPORT_SYMBOL_GPL(o2hb_fill_node_map); | |
1040 | ||
1041 | /* | |
1042 | * heartbeat configfs bits. The heartbeat set is a default set under | |
1043 | * the cluster set in nodemanager.c. | |
1044 | */ | |
1045 | ||
1046 | static struct o2hb_region *to_o2hb_region(struct config_item *item) | |
1047 | { | |
1048 | return item ? container_of(item, struct o2hb_region, hr_item) : NULL; | |
1049 | } | |
1050 | ||
1051 | /* drop_item only drops its ref after killing the thread, nothing should | |
1052 | * be using the region anymore. this has to clean up any state that | |
1053 | * attributes might have built up. */ | |
1054 | static void o2hb_region_release(struct config_item *item) | |
1055 | { | |
1056 | int i; | |
1057 | struct page *page; | |
1058 | struct o2hb_region *reg = to_o2hb_region(item); | |
1059 | ||
1060 | if (reg->hr_tmp_block) | |
1061 | kfree(reg->hr_tmp_block); | |
1062 | ||
1063 | if (reg->hr_slot_data) { | |
1064 | for (i = 0; i < reg->hr_num_pages; i++) { | |
1065 | page = reg->hr_slot_data[i]; | |
1066 | if (page) | |
1067 | __free_page(page); | |
1068 | } | |
1069 | kfree(reg->hr_slot_data); | |
1070 | } | |
1071 | ||
1072 | if (reg->hr_bdev) | |
9a1c3542 | 1073 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
1074 | |
1075 | if (reg->hr_slots) | |
1076 | kfree(reg->hr_slots); | |
1077 | ||
1078 | spin_lock(&o2hb_live_lock); | |
1079 | list_del(®->hr_all_item); | |
1080 | spin_unlock(&o2hb_live_lock); | |
1081 | ||
1082 | kfree(reg); | |
1083 | } | |
1084 | ||
1085 | static int o2hb_read_block_input(struct o2hb_region *reg, | |
1086 | const char *page, | |
1087 | size_t count, | |
1088 | unsigned long *ret_bytes, | |
1089 | unsigned int *ret_bits) | |
1090 | { | |
1091 | unsigned long bytes; | |
1092 | char *p = (char *)page; | |
1093 | ||
1094 | bytes = simple_strtoul(p, &p, 0); | |
1095 | if (!p || (*p && (*p != '\n'))) | |
1096 | return -EINVAL; | |
1097 | ||
1098 | /* Heartbeat and fs min / max block sizes are the same. */ | |
1099 | if (bytes > 4096 || bytes < 512) | |
1100 | return -ERANGE; | |
1101 | if (hweight16(bytes) != 1) | |
1102 | return -EINVAL; | |
1103 | ||
1104 | if (ret_bytes) | |
1105 | *ret_bytes = bytes; | |
1106 | if (ret_bits) | |
1107 | *ret_bits = ffs(bytes) - 1; | |
1108 | ||
1109 | return 0; | |
1110 | } | |
1111 | ||
1112 | static ssize_t o2hb_region_block_bytes_read(struct o2hb_region *reg, | |
1113 | char *page) | |
1114 | { | |
1115 | return sprintf(page, "%u\n", reg->hr_block_bytes); | |
1116 | } | |
1117 | ||
1118 | static ssize_t o2hb_region_block_bytes_write(struct o2hb_region *reg, | |
1119 | const char *page, | |
1120 | size_t count) | |
1121 | { | |
1122 | int status; | |
1123 | unsigned long block_bytes; | |
1124 | unsigned int block_bits; | |
1125 | ||
1126 | if (reg->hr_bdev) | |
1127 | return -EINVAL; | |
1128 | ||
1129 | status = o2hb_read_block_input(reg, page, count, | |
1130 | &block_bytes, &block_bits); | |
1131 | if (status) | |
1132 | return status; | |
1133 | ||
1134 | reg->hr_block_bytes = (unsigned int)block_bytes; | |
1135 | reg->hr_block_bits = block_bits; | |
1136 | ||
1137 | return count; | |
1138 | } | |
1139 | ||
1140 | static ssize_t o2hb_region_start_block_read(struct o2hb_region *reg, | |
1141 | char *page) | |
1142 | { | |
1143 | return sprintf(page, "%llu\n", reg->hr_start_block); | |
1144 | } | |
1145 | ||
1146 | static ssize_t o2hb_region_start_block_write(struct o2hb_region *reg, | |
1147 | const char *page, | |
1148 | size_t count) | |
1149 | { | |
1150 | unsigned long long tmp; | |
1151 | char *p = (char *)page; | |
1152 | ||
1153 | if (reg->hr_bdev) | |
1154 | return -EINVAL; | |
1155 | ||
1156 | tmp = simple_strtoull(p, &p, 0); | |
1157 | if (!p || (*p && (*p != '\n'))) | |
1158 | return -EINVAL; | |
1159 | ||
1160 | reg->hr_start_block = tmp; | |
1161 | ||
1162 | return count; | |
1163 | } | |
1164 | ||
1165 | static ssize_t o2hb_region_blocks_read(struct o2hb_region *reg, | |
1166 | char *page) | |
1167 | { | |
1168 | return sprintf(page, "%d\n", reg->hr_blocks); | |
1169 | } | |
1170 | ||
1171 | static ssize_t o2hb_region_blocks_write(struct o2hb_region *reg, | |
1172 | const char *page, | |
1173 | size_t count) | |
1174 | { | |
1175 | unsigned long tmp; | |
1176 | char *p = (char *)page; | |
1177 | ||
1178 | if (reg->hr_bdev) | |
1179 | return -EINVAL; | |
1180 | ||
1181 | tmp = simple_strtoul(p, &p, 0); | |
1182 | if (!p || (*p && (*p != '\n'))) | |
1183 | return -EINVAL; | |
1184 | ||
1185 | if (tmp > O2NM_MAX_NODES || tmp == 0) | |
1186 | return -ERANGE; | |
1187 | ||
1188 | reg->hr_blocks = (unsigned int)tmp; | |
1189 | ||
1190 | return count; | |
1191 | } | |
1192 | ||
1193 | static ssize_t o2hb_region_dev_read(struct o2hb_region *reg, | |
1194 | char *page) | |
1195 | { | |
1196 | unsigned int ret = 0; | |
1197 | ||
1198 | if (reg->hr_bdev) | |
1199 | ret = sprintf(page, "%s\n", reg->hr_dev_name); | |
1200 | ||
1201 | return ret; | |
1202 | } | |
1203 | ||
1204 | static void o2hb_init_region_params(struct o2hb_region *reg) | |
1205 | { | |
1206 | reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits; | |
1207 | reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; | |
1208 | ||
1209 | mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", | |
1210 | reg->hr_start_block, reg->hr_blocks); | |
1211 | mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", | |
1212 | reg->hr_block_bytes, reg->hr_block_bits); | |
1213 | mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); | |
1214 | mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); | |
1215 | } | |
1216 | ||
1217 | static int o2hb_map_slot_data(struct o2hb_region *reg) | |
1218 | { | |
1219 | int i, j; | |
1220 | unsigned int last_slot; | |
1221 | unsigned int spp = reg->hr_slots_per_page; | |
1222 | struct page *page; | |
1223 | char *raw; | |
1224 | struct o2hb_disk_slot *slot; | |
1225 | ||
1226 | reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); | |
1227 | if (reg->hr_tmp_block == NULL) { | |
1228 | mlog_errno(-ENOMEM); | |
1229 | return -ENOMEM; | |
1230 | } | |
1231 | ||
1232 | reg->hr_slots = kcalloc(reg->hr_blocks, | |
1233 | sizeof(struct o2hb_disk_slot), GFP_KERNEL); | |
1234 | if (reg->hr_slots == NULL) { | |
1235 | mlog_errno(-ENOMEM); | |
1236 | return -ENOMEM; | |
1237 | } | |
1238 | ||
1239 | for(i = 0; i < reg->hr_blocks; i++) { | |
1240 | slot = ®->hr_slots[i]; | |
1241 | slot->ds_node_num = i; | |
1242 | INIT_LIST_HEAD(&slot->ds_live_item); | |
1243 | slot->ds_raw_block = NULL; | |
1244 | } | |
1245 | ||
1246 | reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; | |
1247 | mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " | |
1248 | "at %u blocks per page\n", | |
1249 | reg->hr_num_pages, reg->hr_blocks, spp); | |
1250 | ||
1251 | reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), | |
1252 | GFP_KERNEL); | |
1253 | if (!reg->hr_slot_data) { | |
1254 | mlog_errno(-ENOMEM); | |
1255 | return -ENOMEM; | |
1256 | } | |
1257 | ||
1258 | for(i = 0; i < reg->hr_num_pages; i++) { | |
1259 | page = alloc_page(GFP_KERNEL); | |
1260 | if (!page) { | |
1261 | mlog_errno(-ENOMEM); | |
1262 | return -ENOMEM; | |
1263 | } | |
1264 | ||
1265 | reg->hr_slot_data[i] = page; | |
1266 | ||
1267 | last_slot = i * spp; | |
1268 | raw = page_address(page); | |
1269 | for (j = 0; | |
1270 | (j < spp) && ((j + last_slot) < reg->hr_blocks); | |
1271 | j++) { | |
1272 | BUG_ON((j + last_slot) >= reg->hr_blocks); | |
1273 | ||
1274 | slot = ®->hr_slots[j + last_slot]; | |
1275 | slot->ds_raw_block = | |
1276 | (struct o2hb_disk_heartbeat_block *) raw; | |
1277 | ||
1278 | raw += reg->hr_block_bytes; | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | return 0; | |
1283 | } | |
1284 | ||
1285 | /* Read in all the slots available and populate the tracking | |
1286 | * structures so that we can start with a baseline idea of what's | |
1287 | * there. */ | |
1288 | static int o2hb_populate_slot_data(struct o2hb_region *reg) | |
1289 | { | |
1290 | int ret, i; | |
1291 | struct o2hb_disk_slot *slot; | |
1292 | struct o2hb_disk_heartbeat_block *hb_block; | |
1293 | ||
1294 | mlog_entry_void(); | |
1295 | ||
1296 | ret = o2hb_read_slots(reg, reg->hr_blocks); | |
1297 | if (ret) { | |
1298 | mlog_errno(ret); | |
1299 | goto out; | |
1300 | } | |
1301 | ||
1302 | /* We only want to get an idea of the values initially in each | |
1303 | * slot, so we do no verification - o2hb_check_slot will | |
1304 | * actually determine if each configured slot is valid and | |
1305 | * whether any values have changed. */ | |
1306 | for(i = 0; i < reg->hr_blocks; i++) { | |
1307 | slot = ®->hr_slots[i]; | |
1308 | hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; | |
1309 | ||
1310 | /* Only fill the values that o2hb_check_slot uses to | |
1311 | * determine changing slots */ | |
1312 | slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); | |
1313 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
1314 | } | |
1315 | ||
1316 | out: | |
1317 | mlog_exit(ret); | |
1318 | return ret; | |
1319 | } | |
1320 | ||
1321 | /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */ | |
1322 | static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, | |
1323 | const char *page, | |
1324 | size_t count) | |
1325 | { | |
e6c352db | 1326 | struct task_struct *hb_task; |
a7f6a5fb MF |
1327 | long fd; |
1328 | int sectsize; | |
1329 | char *p = (char *)page; | |
1330 | struct file *filp = NULL; | |
1331 | struct inode *inode = NULL; | |
1332 | ssize_t ret = -EINVAL; | |
1333 | ||
1334 | if (reg->hr_bdev) | |
1335 | goto out; | |
1336 | ||
1337 | /* We can't heartbeat without having had our node number | |
1338 | * configured yet. */ | |
1339 | if (o2nm_this_node() == O2NM_MAX_NODES) | |
1340 | goto out; | |
1341 | ||
1342 | fd = simple_strtol(p, &p, 0); | |
1343 | if (!p || (*p && (*p != '\n'))) | |
1344 | goto out; | |
1345 | ||
1346 | if (fd < 0 || fd >= INT_MAX) | |
1347 | goto out; | |
1348 | ||
1349 | filp = fget(fd); | |
1350 | if (filp == NULL) | |
1351 | goto out; | |
1352 | ||
1353 | if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || | |
1354 | reg->hr_block_bytes == 0) | |
1355 | goto out; | |
1356 | ||
1357 | inode = igrab(filp->f_mapping->host); | |
1358 | if (inode == NULL) | |
1359 | goto out; | |
1360 | ||
1361 | if (!S_ISBLK(inode->i_mode)) | |
1362 | goto out; | |
1363 | ||
1364 | reg->hr_bdev = I_BDEV(filp->f_mapping->host); | |
572c4892 | 1365 | ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ); |
a7f6a5fb MF |
1366 | if (ret) { |
1367 | reg->hr_bdev = NULL; | |
1368 | goto out; | |
1369 | } | |
1370 | inode = NULL; | |
1371 | ||
1372 | bdevname(reg->hr_bdev, reg->hr_dev_name); | |
1373 | ||
e1defc4f | 1374 | sectsize = bdev_logical_block_size(reg->hr_bdev); |
a7f6a5fb MF |
1375 | if (sectsize != reg->hr_block_bytes) { |
1376 | mlog(ML_ERROR, | |
1377 | "blocksize %u incorrect for device, expected %d", | |
1378 | reg->hr_block_bytes, sectsize); | |
1379 | ret = -EINVAL; | |
1380 | goto out; | |
1381 | } | |
1382 | ||
1383 | o2hb_init_region_params(reg); | |
1384 | ||
1385 | /* Generation of zero is invalid */ | |
1386 | do { | |
1387 | get_random_bytes(®->hr_generation, | |
1388 | sizeof(reg->hr_generation)); | |
1389 | } while (reg->hr_generation == 0); | |
1390 | ||
1391 | ret = o2hb_map_slot_data(reg); | |
1392 | if (ret) { | |
1393 | mlog_errno(ret); | |
1394 | goto out; | |
1395 | } | |
1396 | ||
1397 | ret = o2hb_populate_slot_data(reg); | |
1398 | if (ret) { | |
1399 | mlog_errno(ret); | |
1400 | goto out; | |
1401 | } | |
1402 | ||
c4028958 | 1403 | INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout); |
a7f6a5fb MF |
1404 | |
1405 | /* | |
1406 | * A node is considered live after it has beat LIVE_THRESHOLD | |
1407 | * times. We're not steady until we've given them a chance | |
1408 | * _after_ our first read. | |
1409 | */ | |
1410 | atomic_set(®->hr_steady_iterations, O2HB_LIVE_THRESHOLD + 1); | |
1411 | ||
e6c352db JB |
1412 | hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s", |
1413 | reg->hr_item.ci_name); | |
1414 | if (IS_ERR(hb_task)) { | |
1415 | ret = PTR_ERR(hb_task); | |
a7f6a5fb | 1416 | mlog_errno(ret); |
a7f6a5fb MF |
1417 | goto out; |
1418 | } | |
1419 | ||
e6c352db JB |
1420 | spin_lock(&o2hb_live_lock); |
1421 | reg->hr_task = hb_task; | |
1422 | spin_unlock(&o2hb_live_lock); | |
1423 | ||
a7f6a5fb MF |
1424 | ret = wait_event_interruptible(o2hb_steady_queue, |
1425 | atomic_read(®->hr_steady_iterations) == 0); | |
1426 | if (ret) { | |
e6df3a66 | 1427 | /* We got interrupted (hello ptrace!). Clean up */ |
e6c352db JB |
1428 | spin_lock(&o2hb_live_lock); |
1429 | hb_task = reg->hr_task; | |
a7f6a5fb | 1430 | reg->hr_task = NULL; |
e6c352db JB |
1431 | spin_unlock(&o2hb_live_lock); |
1432 | ||
1433 | if (hb_task) | |
1434 | kthread_stop(hb_task); | |
a7f6a5fb MF |
1435 | goto out; |
1436 | } | |
1437 | ||
e6df3a66 JB |
1438 | /* Ok, we were woken. Make sure it wasn't by drop_item() */ |
1439 | spin_lock(&o2hb_live_lock); | |
1440 | hb_task = reg->hr_task; | |
1441 | spin_unlock(&o2hb_live_lock); | |
1442 | ||
1443 | if (hb_task) | |
1444 | ret = count; | |
1445 | else | |
1446 | ret = -EIO; | |
1447 | ||
a7f6a5fb MF |
1448 | out: |
1449 | if (filp) | |
1450 | fput(filp); | |
1451 | if (inode) | |
1452 | iput(inode); | |
1453 | if (ret < 0) { | |
1454 | if (reg->hr_bdev) { | |
9a1c3542 | 1455 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
1456 | reg->hr_bdev = NULL; |
1457 | } | |
1458 | } | |
1459 | return ret; | |
1460 | } | |
1461 | ||
92efc152 ZW |
1462 | static ssize_t o2hb_region_pid_read(struct o2hb_region *reg, |
1463 | char *page) | |
1464 | { | |
e6c352db JB |
1465 | pid_t pid = 0; |
1466 | ||
1467 | spin_lock(&o2hb_live_lock); | |
1468 | if (reg->hr_task) | |
ba25f9dc | 1469 | pid = task_pid_nr(reg->hr_task); |
e6c352db JB |
1470 | spin_unlock(&o2hb_live_lock); |
1471 | ||
1472 | if (!pid) | |
92efc152 ZW |
1473 | return 0; |
1474 | ||
e6c352db | 1475 | return sprintf(page, "%u\n", pid); |
92efc152 ZW |
1476 | } |
1477 | ||
a7f6a5fb MF |
1478 | struct o2hb_region_attribute { |
1479 | struct configfs_attribute attr; | |
1480 | ssize_t (*show)(struct o2hb_region *, char *); | |
1481 | ssize_t (*store)(struct o2hb_region *, const char *, size_t); | |
1482 | }; | |
1483 | ||
1484 | static struct o2hb_region_attribute o2hb_region_attr_block_bytes = { | |
1485 | .attr = { .ca_owner = THIS_MODULE, | |
1486 | .ca_name = "block_bytes", | |
1487 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1488 | .show = o2hb_region_block_bytes_read, | |
1489 | .store = o2hb_region_block_bytes_write, | |
1490 | }; | |
1491 | ||
1492 | static struct o2hb_region_attribute o2hb_region_attr_start_block = { | |
1493 | .attr = { .ca_owner = THIS_MODULE, | |
1494 | .ca_name = "start_block", | |
1495 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1496 | .show = o2hb_region_start_block_read, | |
1497 | .store = o2hb_region_start_block_write, | |
1498 | }; | |
1499 | ||
1500 | static struct o2hb_region_attribute o2hb_region_attr_blocks = { | |
1501 | .attr = { .ca_owner = THIS_MODULE, | |
1502 | .ca_name = "blocks", | |
1503 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1504 | .show = o2hb_region_blocks_read, | |
1505 | .store = o2hb_region_blocks_write, | |
1506 | }; | |
1507 | ||
1508 | static struct o2hb_region_attribute o2hb_region_attr_dev = { | |
1509 | .attr = { .ca_owner = THIS_MODULE, | |
1510 | .ca_name = "dev", | |
1511 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1512 | .show = o2hb_region_dev_read, | |
1513 | .store = o2hb_region_dev_write, | |
1514 | }; | |
1515 | ||
92efc152 ZW |
1516 | static struct o2hb_region_attribute o2hb_region_attr_pid = { |
1517 | .attr = { .ca_owner = THIS_MODULE, | |
1518 | .ca_name = "pid", | |
1519 | .ca_mode = S_IRUGO | S_IRUSR }, | |
1520 | .show = o2hb_region_pid_read, | |
1521 | }; | |
1522 | ||
a7f6a5fb MF |
1523 | static struct configfs_attribute *o2hb_region_attrs[] = { |
1524 | &o2hb_region_attr_block_bytes.attr, | |
1525 | &o2hb_region_attr_start_block.attr, | |
1526 | &o2hb_region_attr_blocks.attr, | |
1527 | &o2hb_region_attr_dev.attr, | |
92efc152 | 1528 | &o2hb_region_attr_pid.attr, |
a7f6a5fb MF |
1529 | NULL, |
1530 | }; | |
1531 | ||
1532 | static ssize_t o2hb_region_show(struct config_item *item, | |
1533 | struct configfs_attribute *attr, | |
1534 | char *page) | |
1535 | { | |
1536 | struct o2hb_region *reg = to_o2hb_region(item); | |
1537 | struct o2hb_region_attribute *o2hb_region_attr = | |
1538 | container_of(attr, struct o2hb_region_attribute, attr); | |
1539 | ssize_t ret = 0; | |
1540 | ||
1541 | if (o2hb_region_attr->show) | |
1542 | ret = o2hb_region_attr->show(reg, page); | |
1543 | return ret; | |
1544 | } | |
1545 | ||
1546 | static ssize_t o2hb_region_store(struct config_item *item, | |
1547 | struct configfs_attribute *attr, | |
1548 | const char *page, size_t count) | |
1549 | { | |
1550 | struct o2hb_region *reg = to_o2hb_region(item); | |
1551 | struct o2hb_region_attribute *o2hb_region_attr = | |
1552 | container_of(attr, struct o2hb_region_attribute, attr); | |
1553 | ssize_t ret = -EINVAL; | |
1554 | ||
1555 | if (o2hb_region_attr->store) | |
1556 | ret = o2hb_region_attr->store(reg, page, count); | |
1557 | return ret; | |
1558 | } | |
1559 | ||
1560 | static struct configfs_item_operations o2hb_region_item_ops = { | |
1561 | .release = o2hb_region_release, | |
1562 | .show_attribute = o2hb_region_show, | |
1563 | .store_attribute = o2hb_region_store, | |
1564 | }; | |
1565 | ||
1566 | static struct config_item_type o2hb_region_type = { | |
1567 | .ct_item_ops = &o2hb_region_item_ops, | |
1568 | .ct_attrs = o2hb_region_attrs, | |
1569 | .ct_owner = THIS_MODULE, | |
1570 | }; | |
1571 | ||
1572 | /* heartbeat set */ | |
1573 | ||
1574 | struct o2hb_heartbeat_group { | |
1575 | struct config_group hs_group; | |
1576 | /* some stuff? */ | |
1577 | }; | |
1578 | ||
1579 | static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) | |
1580 | { | |
1581 | return group ? | |
1582 | container_of(group, struct o2hb_heartbeat_group, hs_group) | |
1583 | : NULL; | |
1584 | } | |
1585 | ||
f89ab861 JB |
1586 | static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, |
1587 | const char *name) | |
a7f6a5fb MF |
1588 | { |
1589 | struct o2hb_region *reg = NULL; | |
a7f6a5fb | 1590 | |
cd861280 | 1591 | reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL); |
f89ab861 | 1592 | if (reg == NULL) |
a6795e9e | 1593 | return ERR_PTR(-ENOMEM); |
a7f6a5fb MF |
1594 | |
1595 | config_item_init_type_name(®->hr_item, name, &o2hb_region_type); | |
1596 | ||
a7f6a5fb MF |
1597 | spin_lock(&o2hb_live_lock); |
1598 | list_add_tail(®->hr_all_item, &o2hb_all_regions); | |
1599 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb | 1600 | |
a6795e9e | 1601 | return ®->hr_item; |
a7f6a5fb MF |
1602 | } |
1603 | ||
1604 | static void o2hb_heartbeat_group_drop_item(struct config_group *group, | |
1605 | struct config_item *item) | |
1606 | { | |
e6c352db | 1607 | struct task_struct *hb_task; |
a7f6a5fb MF |
1608 | struct o2hb_region *reg = to_o2hb_region(item); |
1609 | ||
1610 | /* stop the thread when the user removes the region dir */ | |
e6c352db JB |
1611 | spin_lock(&o2hb_live_lock); |
1612 | hb_task = reg->hr_task; | |
1613 | reg->hr_task = NULL; | |
1614 | spin_unlock(&o2hb_live_lock); | |
1615 | ||
1616 | if (hb_task) | |
1617 | kthread_stop(hb_task); | |
a7f6a5fb | 1618 | |
e6df3a66 JB |
1619 | /* |
1620 | * If we're racing a dev_write(), we need to wake them. They will | |
1621 | * check reg->hr_task | |
1622 | */ | |
1623 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
1624 | atomic_set(®->hr_steady_iterations, 0); | |
1625 | wake_up(&o2hb_steady_queue); | |
1626 | } | |
1627 | ||
a7f6a5fb MF |
1628 | config_item_put(item); |
1629 | } | |
1630 | ||
1631 | struct o2hb_heartbeat_group_attribute { | |
1632 | struct configfs_attribute attr; | |
1633 | ssize_t (*show)(struct o2hb_heartbeat_group *, char *); | |
1634 | ssize_t (*store)(struct o2hb_heartbeat_group *, const char *, size_t); | |
1635 | }; | |
1636 | ||
1637 | static ssize_t o2hb_heartbeat_group_show(struct config_item *item, | |
1638 | struct configfs_attribute *attr, | |
1639 | char *page) | |
1640 | { | |
1641 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
1642 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
1643 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
1644 | ssize_t ret = 0; | |
1645 | ||
1646 | if (o2hb_heartbeat_group_attr->show) | |
1647 | ret = o2hb_heartbeat_group_attr->show(reg, page); | |
1648 | return ret; | |
1649 | } | |
1650 | ||
1651 | static ssize_t o2hb_heartbeat_group_store(struct config_item *item, | |
1652 | struct configfs_attribute *attr, | |
1653 | const char *page, size_t count) | |
1654 | { | |
1655 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
1656 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
1657 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
1658 | ssize_t ret = -EINVAL; | |
1659 | ||
1660 | if (o2hb_heartbeat_group_attr->store) | |
1661 | ret = o2hb_heartbeat_group_attr->store(reg, page, count); | |
1662 | return ret; | |
1663 | } | |
1664 | ||
1665 | static ssize_t o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group *group, | |
1666 | char *page) | |
1667 | { | |
1668 | return sprintf(page, "%u\n", o2hb_dead_threshold); | |
1669 | } | |
1670 | ||
1671 | static ssize_t o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group *group, | |
1672 | const char *page, | |
1673 | size_t count) | |
1674 | { | |
1675 | unsigned long tmp; | |
1676 | char *p = (char *)page; | |
1677 | ||
1678 | tmp = simple_strtoul(p, &p, 10); | |
1679 | if (!p || (*p && (*p != '\n'))) | |
1680 | return -EINVAL; | |
1681 | ||
1682 | /* this will validate ranges for us. */ | |
1683 | o2hb_dead_threshold_set((unsigned int) tmp); | |
1684 | ||
1685 | return count; | |
1686 | } | |
1687 | ||
1688 | static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold = { | |
1689 | .attr = { .ca_owner = THIS_MODULE, | |
1690 | .ca_name = "dead_threshold", | |
1691 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1692 | .show = o2hb_heartbeat_group_threshold_show, | |
1693 | .store = o2hb_heartbeat_group_threshold_store, | |
1694 | }; | |
1695 | ||
1696 | static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { | |
1697 | &o2hb_heartbeat_group_attr_threshold.attr, | |
1698 | NULL, | |
1699 | }; | |
1700 | ||
1701 | static struct configfs_item_operations o2hb_hearbeat_group_item_ops = { | |
1702 | .show_attribute = o2hb_heartbeat_group_show, | |
1703 | .store_attribute = o2hb_heartbeat_group_store, | |
1704 | }; | |
1705 | ||
1706 | static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { | |
1707 | .make_item = o2hb_heartbeat_group_make_item, | |
1708 | .drop_item = o2hb_heartbeat_group_drop_item, | |
1709 | }; | |
1710 | ||
1711 | static struct config_item_type o2hb_heartbeat_group_type = { | |
1712 | .ct_group_ops = &o2hb_heartbeat_group_group_ops, | |
1713 | .ct_item_ops = &o2hb_hearbeat_group_item_ops, | |
1714 | .ct_attrs = o2hb_heartbeat_group_attrs, | |
1715 | .ct_owner = THIS_MODULE, | |
1716 | }; | |
1717 | ||
1718 | /* this is just here to avoid touching group in heartbeat.h which the | |
1719 | * entire damn world #includes */ | |
1720 | struct config_group *o2hb_alloc_hb_set(void) | |
1721 | { | |
1722 | struct o2hb_heartbeat_group *hs = NULL; | |
1723 | struct config_group *ret = NULL; | |
1724 | ||
cd861280 | 1725 | hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); |
a7f6a5fb MF |
1726 | if (hs == NULL) |
1727 | goto out; | |
1728 | ||
1729 | config_group_init_type_name(&hs->hs_group, "heartbeat", | |
1730 | &o2hb_heartbeat_group_type); | |
1731 | ||
1732 | ret = &hs->hs_group; | |
1733 | out: | |
1734 | if (ret == NULL) | |
1735 | kfree(hs); | |
1736 | return ret; | |
1737 | } | |
1738 | ||
1739 | void o2hb_free_hb_set(struct config_group *group) | |
1740 | { | |
1741 | struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); | |
1742 | kfree(hs); | |
1743 | } | |
1744 | ||
1745 | /* hb callback registration and issueing */ | |
1746 | ||
1747 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) | |
1748 | { | |
1749 | if (type == O2HB_NUM_CB) | |
1750 | return ERR_PTR(-EINVAL); | |
1751 | ||
1752 | return &o2hb_callbacks[type]; | |
1753 | } | |
1754 | ||
1755 | void o2hb_setup_callback(struct o2hb_callback_func *hc, | |
1756 | enum o2hb_callback_type type, | |
1757 | o2hb_cb_func *func, | |
1758 | void *data, | |
1759 | int priority) | |
1760 | { | |
1761 | INIT_LIST_HEAD(&hc->hc_item); | |
1762 | hc->hc_func = func; | |
1763 | hc->hc_data = data; | |
1764 | hc->hc_priority = priority; | |
1765 | hc->hc_type = type; | |
1766 | hc->hc_magic = O2HB_CB_MAGIC; | |
1767 | } | |
1768 | EXPORT_SYMBOL_GPL(o2hb_setup_callback); | |
1769 | ||
14829422 JB |
1770 | static struct o2hb_region *o2hb_find_region(const char *region_uuid) |
1771 | { | |
1772 | struct o2hb_region *p, *reg = NULL; | |
1773 | ||
1774 | assert_spin_locked(&o2hb_live_lock); | |
1775 | ||
1776 | list_for_each_entry(p, &o2hb_all_regions, hr_all_item) { | |
1777 | if (!strcmp(region_uuid, config_item_name(&p->hr_item))) { | |
1778 | reg = p; | |
1779 | break; | |
1780 | } | |
1781 | } | |
1782 | ||
1783 | return reg; | |
1784 | } | |
1785 | ||
1786 | static int o2hb_region_get(const char *region_uuid) | |
1787 | { | |
1788 | int ret = 0; | |
1789 | struct o2hb_region *reg; | |
1790 | ||
1791 | spin_lock(&o2hb_live_lock); | |
1792 | ||
1793 | reg = o2hb_find_region(region_uuid); | |
1794 | if (!reg) | |
1795 | ret = -ENOENT; | |
1796 | spin_unlock(&o2hb_live_lock); | |
1797 | ||
16c6a4f2 JB |
1798 | if (ret) |
1799 | goto out; | |
1800 | ||
1801 | ret = o2nm_depend_this_node(); | |
1802 | if (ret) | |
1803 | goto out; | |
14829422 | 1804 | |
16c6a4f2 JB |
1805 | ret = o2nm_depend_item(®->hr_item); |
1806 | if (ret) | |
1807 | o2nm_undepend_this_node(); | |
1808 | ||
1809 | out: | |
14829422 JB |
1810 | return ret; |
1811 | } | |
1812 | ||
1813 | static void o2hb_region_put(const char *region_uuid) | |
1814 | { | |
1815 | struct o2hb_region *reg; | |
1816 | ||
1817 | spin_lock(&o2hb_live_lock); | |
1818 | ||
1819 | reg = o2hb_find_region(region_uuid); | |
1820 | ||
1821 | spin_unlock(&o2hb_live_lock); | |
1822 | ||
16c6a4f2 | 1823 | if (reg) { |
14829422 | 1824 | o2nm_undepend_item(®->hr_item); |
16c6a4f2 JB |
1825 | o2nm_undepend_this_node(); |
1826 | } | |
14829422 JB |
1827 | } |
1828 | ||
1829 | int o2hb_register_callback(const char *region_uuid, | |
1830 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
1831 | { |
1832 | struct o2hb_callback_func *tmp; | |
1833 | struct list_head *iter; | |
1834 | struct o2hb_callback *hbcall; | |
1835 | int ret; | |
1836 | ||
1837 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
1838 | BUG_ON(!list_empty(&hc->hc_item)); | |
1839 | ||
1840 | hbcall = hbcall_from_type(hc->hc_type); | |
1841 | if (IS_ERR(hbcall)) { | |
1842 | ret = PTR_ERR(hbcall); | |
1843 | goto out; | |
1844 | } | |
1845 | ||
14829422 JB |
1846 | if (region_uuid) { |
1847 | ret = o2hb_region_get(region_uuid); | |
1848 | if (ret) | |
1849 | goto out; | |
1850 | } | |
1851 | ||
a7f6a5fb MF |
1852 | down_write(&o2hb_callback_sem); |
1853 | ||
1854 | list_for_each(iter, &hbcall->list) { | |
1855 | tmp = list_entry(iter, struct o2hb_callback_func, hc_item); | |
1856 | if (hc->hc_priority < tmp->hc_priority) { | |
1857 | list_add_tail(&hc->hc_item, iter); | |
1858 | break; | |
1859 | } | |
1860 | } | |
1861 | if (list_empty(&hc->hc_item)) | |
1862 | list_add_tail(&hc->hc_item, &hbcall->list); | |
1863 | ||
1864 | up_write(&o2hb_callback_sem); | |
1865 | ret = 0; | |
1866 | out: | |
1867 | mlog(ML_HEARTBEAT, "returning %d on behalf of %p for funcs %p\n", | |
1868 | ret, __builtin_return_address(0), hc); | |
1869 | return ret; | |
1870 | } | |
1871 | EXPORT_SYMBOL_GPL(o2hb_register_callback); | |
1872 | ||
14829422 JB |
1873 | void o2hb_unregister_callback(const char *region_uuid, |
1874 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
1875 | { |
1876 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
1877 | ||
1878 | mlog(ML_HEARTBEAT, "on behalf of %p for funcs %p\n", | |
1879 | __builtin_return_address(0), hc); | |
1880 | ||
14829422 | 1881 | /* XXX Can this happen _with_ a region reference? */ |
a7f6a5fb | 1882 | if (list_empty(&hc->hc_item)) |
c24f72cc | 1883 | return; |
a7f6a5fb | 1884 | |
14829422 JB |
1885 | if (region_uuid) |
1886 | o2hb_region_put(region_uuid); | |
1887 | ||
a7f6a5fb MF |
1888 | down_write(&o2hb_callback_sem); |
1889 | ||
1890 | list_del_init(&hc->hc_item); | |
1891 | ||
1892 | up_write(&o2hb_callback_sem); | |
a7f6a5fb MF |
1893 | } |
1894 | EXPORT_SYMBOL_GPL(o2hb_unregister_callback); | |
1895 | ||
1896 | int o2hb_check_node_heartbeating(u8 node_num) | |
1897 | { | |
1898 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1899 | ||
1900 | o2hb_fill_node_map(testing_map, sizeof(testing_map)); | |
1901 | if (!test_bit(node_num, testing_map)) { | |
1902 | mlog(ML_HEARTBEAT, | |
1903 | "node (%u) does not have heartbeating enabled.\n", | |
1904 | node_num); | |
1905 | return 0; | |
1906 | } | |
1907 | ||
1908 | return 1; | |
1909 | } | |
1910 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating); | |
1911 | ||
1912 | int o2hb_check_node_heartbeating_from_callback(u8 node_num) | |
1913 | { | |
1914 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1915 | ||
1916 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); | |
1917 | if (!test_bit(node_num, testing_map)) { | |
1918 | mlog(ML_HEARTBEAT, | |
1919 | "node (%u) does not have heartbeating enabled.\n", | |
1920 | node_num); | |
1921 | return 0; | |
1922 | } | |
1923 | ||
1924 | return 1; | |
1925 | } | |
1926 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); | |
1927 | ||
1928 | /* Makes sure our local node is configured with a node number, and is | |
1929 | * heartbeating. */ | |
1930 | int o2hb_check_local_node_heartbeating(void) | |
1931 | { | |
1932 | u8 node_num; | |
1933 | ||
1934 | /* if this node was set then we have networking */ | |
1935 | node_num = o2nm_this_node(); | |
1936 | if (node_num == O2NM_MAX_NODES) { | |
1937 | mlog(ML_HEARTBEAT, "this node has not been configured.\n"); | |
1938 | return 0; | |
1939 | } | |
1940 | ||
1941 | return o2hb_check_node_heartbeating(node_num); | |
1942 | } | |
1943 | EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating); | |
1944 | ||
1945 | /* | |
1946 | * this is just a hack until we get the plumbing which flips file systems | |
1947 | * read only and drops the hb ref instead of killing the node dead. | |
1948 | */ | |
1949 | void o2hb_stop_all_regions(void) | |
1950 | { | |
1951 | struct o2hb_region *reg; | |
1952 | ||
1953 | mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); | |
1954 | ||
1955 | spin_lock(&o2hb_live_lock); | |
1956 | ||
1957 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) | |
1958 | reg->hr_unclean_stop = 1; | |
1959 | ||
1960 | spin_unlock(&o2hb_live_lock); | |
1961 | } | |
1962 | EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); |