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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> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
a7f6a5fb MF |
38 | |
39 | #include "heartbeat.h" | |
40 | #include "tcp.h" | |
41 | #include "nodemanager.h" | |
42 | #include "quorum.h" | |
43 | ||
44 | #include "masklog.h" | |
45 | ||
46 | ||
47 | /* | |
48 | * The first heartbeat pass had one global thread that would serialize all hb | |
49 | * callback calls. This global serializing sem should only be removed once | |
50 | * we've made sure that all callees can deal with being called concurrently | |
51 | * from multiple hb region threads. | |
52 | */ | |
53 | static DECLARE_RWSEM(o2hb_callback_sem); | |
54 | ||
55 | /* | |
56 | * multiple hb threads are watching multiple regions. A node is live | |
57 | * whenever any of the threads sees activity from the node in its region. | |
58 | */ | |
34af946a | 59 | static DEFINE_SPINLOCK(o2hb_live_lock); |
a7f6a5fb MF |
60 | static struct list_head o2hb_live_slots[O2NM_MAX_NODES]; |
61 | static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
62 | static LIST_HEAD(o2hb_node_events); | |
63 | static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue); | |
64 | ||
536f0741 SM |
65 | /* |
66 | * In global heartbeat, we maintain a series of region bitmaps. | |
67 | * - o2hb_region_bitmap allows us to limit the region number to max region. | |
e7d656ba | 68 | * - o2hb_live_region_bitmap tracks live regions (seen steady iterations). |
43182d2a SM |
69 | * - o2hb_quorum_region_bitmap tracks live regions that have seen all nodes |
70 | * heartbeat on it. | |
b1c5ebfb | 71 | * - o2hb_failed_region_bitmap tracks the regions that have seen io timeouts. |
536f0741 SM |
72 | */ |
73 | static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; | |
e7d656ba | 74 | static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
43182d2a | 75 | static unsigned long o2hb_quorum_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
b1c5ebfb | 76 | static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
536f0741 | 77 | |
8ca8b0bb | 78 | #define O2HB_DB_TYPE_LIVENODES 0 |
a6de0136 SM |
79 | #define O2HB_DB_TYPE_LIVEREGIONS 1 |
80 | #define O2HB_DB_TYPE_QUORUMREGIONS 2 | |
81 | #define O2HB_DB_TYPE_FAILEDREGIONS 3 | |
1f285305 SM |
82 | #define O2HB_DB_TYPE_REGION_LIVENODES 4 |
83 | #define O2HB_DB_TYPE_REGION_NUMBER 5 | |
43695d09 | 84 | #define O2HB_DB_TYPE_REGION_ELAPSED_TIME 6 |
8ca8b0bb SM |
85 | struct o2hb_debug_buf { |
86 | int db_type; | |
87 | int db_size; | |
88 | int db_len; | |
89 | void *db_data; | |
90 | }; | |
91 | ||
92 | static struct o2hb_debug_buf *o2hb_db_livenodes; | |
a6de0136 SM |
93 | static struct o2hb_debug_buf *o2hb_db_liveregions; |
94 | static struct o2hb_debug_buf *o2hb_db_quorumregions; | |
95 | static struct o2hb_debug_buf *o2hb_db_failedregions; | |
8ca8b0bb | 96 | |
87d3d3f3 SM |
97 | #define O2HB_DEBUG_DIR "o2hb" |
98 | #define O2HB_DEBUG_LIVENODES "livenodes" | |
a6de0136 SM |
99 | #define O2HB_DEBUG_LIVEREGIONS "live_regions" |
100 | #define O2HB_DEBUG_QUORUMREGIONS "quorum_regions" | |
101 | #define O2HB_DEBUG_FAILEDREGIONS "failed_regions" | |
1f285305 | 102 | #define O2HB_DEBUG_REGION_NUMBER "num" |
43695d09 | 103 | #define O2HB_DEBUG_REGION_ELAPSED_TIME "elapsed_time_in_ms" |
8ca8b0bb | 104 | |
87d3d3f3 SM |
105 | static struct dentry *o2hb_debug_dir; |
106 | static struct dentry *o2hb_debug_livenodes; | |
a6de0136 SM |
107 | static struct dentry *o2hb_debug_liveregions; |
108 | static struct dentry *o2hb_debug_quorumregions; | |
109 | static struct dentry *o2hb_debug_failedregions; | |
87d3d3f3 | 110 | |
a7f6a5fb MF |
111 | static LIST_HEAD(o2hb_all_regions); |
112 | ||
113 | static struct o2hb_callback { | |
114 | struct list_head list; | |
115 | } o2hb_callbacks[O2HB_NUM_CB]; | |
116 | ||
117 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type); | |
118 | ||
119 | #define O2HB_DEFAULT_BLOCK_BITS 9 | |
120 | ||
54b5187b SM |
121 | enum o2hb_heartbeat_modes { |
122 | O2HB_HEARTBEAT_LOCAL = 0, | |
123 | O2HB_HEARTBEAT_GLOBAL, | |
124 | O2HB_HEARTBEAT_NUM_MODES, | |
125 | }; | |
126 | ||
127 | char *o2hb_heartbeat_mode_desc[O2HB_HEARTBEAT_NUM_MODES] = { | |
128 | "local", /* O2HB_HEARTBEAT_LOCAL */ | |
129 | "global", /* O2HB_HEARTBEAT_GLOBAL */ | |
130 | }; | |
131 | ||
a7f6a5fb | 132 | unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD; |
54b5187b | 133 | unsigned int o2hb_heartbeat_mode = O2HB_HEARTBEAT_LOCAL; |
a7f6a5fb | 134 | |
2bd63216 | 135 | /* Only sets a new threshold if there are no active regions. |
a7f6a5fb MF |
136 | * |
137 | * No locking or otherwise interesting code is required for reading | |
138 | * o2hb_dead_threshold as it can't change once regions are active and | |
139 | * it's not interesting to anyone until then anyway. */ | |
140 | static void o2hb_dead_threshold_set(unsigned int threshold) | |
141 | { | |
142 | if (threshold > O2HB_MIN_DEAD_THRESHOLD) { | |
143 | spin_lock(&o2hb_live_lock); | |
144 | if (list_empty(&o2hb_all_regions)) | |
145 | o2hb_dead_threshold = threshold; | |
146 | spin_unlock(&o2hb_live_lock); | |
147 | } | |
148 | } | |
149 | ||
54b5187b SM |
150 | static int o2hb_global_hearbeat_mode_set(unsigned int hb_mode) |
151 | { | |
152 | int ret = -1; | |
153 | ||
154 | if (hb_mode < O2HB_HEARTBEAT_NUM_MODES) { | |
155 | spin_lock(&o2hb_live_lock); | |
156 | if (list_empty(&o2hb_all_regions)) { | |
157 | o2hb_heartbeat_mode = hb_mode; | |
158 | ret = 0; | |
159 | } | |
160 | spin_unlock(&o2hb_live_lock); | |
161 | } | |
162 | ||
163 | return ret; | |
164 | } | |
165 | ||
a7f6a5fb MF |
166 | struct o2hb_node_event { |
167 | struct list_head hn_item; | |
168 | enum o2hb_callback_type hn_event_type; | |
169 | struct o2nm_node *hn_node; | |
170 | int hn_node_num; | |
171 | }; | |
172 | ||
173 | struct o2hb_disk_slot { | |
174 | struct o2hb_disk_heartbeat_block *ds_raw_block; | |
175 | u8 ds_node_num; | |
176 | u64 ds_last_time; | |
177 | u64 ds_last_generation; | |
178 | u16 ds_equal_samples; | |
179 | u16 ds_changed_samples; | |
180 | struct list_head ds_live_item; | |
181 | }; | |
182 | ||
183 | /* each thread owns a region.. when we're asked to tear down the region | |
184 | * we ask the thread to stop, who cleans up the region */ | |
185 | struct o2hb_region { | |
186 | struct config_item hr_item; | |
187 | ||
188 | struct list_head hr_all_item; | |
189 | unsigned hr_unclean_stop:1; | |
190 | ||
191 | /* protected by the hr_callback_sem */ | |
192 | struct task_struct *hr_task; | |
193 | ||
194 | unsigned int hr_blocks; | |
195 | unsigned long long hr_start_block; | |
196 | ||
197 | unsigned int hr_block_bits; | |
198 | unsigned int hr_block_bytes; | |
199 | ||
200 | unsigned int hr_slots_per_page; | |
201 | unsigned int hr_num_pages; | |
202 | ||
203 | struct page **hr_slot_data; | |
204 | struct block_device *hr_bdev; | |
205 | struct o2hb_disk_slot *hr_slots; | |
206 | ||
823a637a SM |
207 | /* live node map of this region */ |
208 | unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
536f0741 | 209 | unsigned int hr_region_num; |
823a637a | 210 | |
1f285305 SM |
211 | struct dentry *hr_debug_dir; |
212 | struct dentry *hr_debug_livenodes; | |
213 | struct dentry *hr_debug_regnum; | |
43695d09 | 214 | struct dentry *hr_debug_elapsed_time; |
1f285305 SM |
215 | struct o2hb_debug_buf *hr_db_livenodes; |
216 | struct o2hb_debug_buf *hr_db_regnum; | |
43695d09 | 217 | struct o2hb_debug_buf *hr_db_elapsed_time; |
1f285305 | 218 | |
a7f6a5fb MF |
219 | /* let the person setting up hb wait for it to return until it |
220 | * has reached a 'steady' state. This will be fixed when we have | |
221 | * a more complete api that doesn't lead to this sort of fragility. */ | |
222 | atomic_t hr_steady_iterations; | |
223 | ||
224 | char hr_dev_name[BDEVNAME_SIZE]; | |
225 | ||
226 | unsigned int hr_timeout_ms; | |
227 | ||
228 | /* randomized as the region goes up and down so that a node | |
229 | * recognizes a node going up and down in one iteration */ | |
230 | u64 hr_generation; | |
231 | ||
c4028958 | 232 | struct delayed_work hr_write_timeout_work; |
a7f6a5fb MF |
233 | unsigned long hr_last_timeout_start; |
234 | ||
235 | /* Used during o2hb_check_slot to hold a copy of the block | |
236 | * being checked because we temporarily have to zero out the | |
237 | * crc field. */ | |
238 | struct o2hb_disk_heartbeat_block *hr_tmp_block; | |
239 | }; | |
240 | ||
241 | struct o2hb_bio_wait_ctxt { | |
242 | atomic_t wc_num_reqs; | |
243 | struct completion wc_io_complete; | |
a9e2ae39 | 244 | int wc_error; |
a7f6a5fb MF |
245 | }; |
246 | ||
b1c5ebfb SM |
247 | static int o2hb_pop_count(void *map, int count) |
248 | { | |
249 | int i = -1, pop = 0; | |
250 | ||
251 | while ((i = find_next_bit(map, count, i + 1)) < count) | |
252 | pop++; | |
253 | return pop; | |
254 | } | |
255 | ||
c4028958 | 256 | static void o2hb_write_timeout(struct work_struct *work) |
a7f6a5fb | 257 | { |
b1c5ebfb SM |
258 | int failed, quorum; |
259 | unsigned long flags; | |
c4028958 DH |
260 | struct o2hb_region *reg = |
261 | container_of(work, struct o2hb_region, | |
262 | hr_write_timeout_work.work); | |
a7f6a5fb MF |
263 | |
264 | mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u " | |
265 | "milliseconds\n", reg->hr_dev_name, | |
2bd63216 | 266 | jiffies_to_msecs(jiffies - reg->hr_last_timeout_start)); |
b1c5ebfb SM |
267 | |
268 | if (o2hb_global_heartbeat_active()) { | |
269 | spin_lock_irqsave(&o2hb_live_lock, flags); | |
270 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
271 | set_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
272 | failed = o2hb_pop_count(&o2hb_failed_region_bitmap, | |
273 | O2NM_MAX_REGIONS); | |
274 | quorum = o2hb_pop_count(&o2hb_quorum_region_bitmap, | |
275 | O2NM_MAX_REGIONS); | |
276 | spin_unlock_irqrestore(&o2hb_live_lock, flags); | |
277 | ||
278 | mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n", | |
279 | quorum, failed); | |
280 | ||
281 | /* | |
282 | * Fence if the number of failed regions >= half the number | |
283 | * of quorum regions | |
284 | */ | |
285 | if ((failed << 1) < quorum) | |
286 | return; | |
287 | } | |
288 | ||
a7f6a5fb MF |
289 | o2quo_disk_timeout(); |
290 | } | |
291 | ||
292 | static void o2hb_arm_write_timeout(struct o2hb_region *reg) | |
293 | { | |
b31d308d TM |
294 | mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n", |
295 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
a7f6a5fb | 296 | |
b1c5ebfb SM |
297 | if (o2hb_global_heartbeat_active()) { |
298 | spin_lock(&o2hb_live_lock); | |
299 | clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
300 | spin_unlock(&o2hb_live_lock); | |
301 | } | |
a7f6a5fb MF |
302 | cancel_delayed_work(®->hr_write_timeout_work); |
303 | reg->hr_last_timeout_start = jiffies; | |
304 | schedule_delayed_work(®->hr_write_timeout_work, | |
305 | msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS)); | |
306 | } | |
307 | ||
308 | static void o2hb_disarm_write_timeout(struct o2hb_region *reg) | |
309 | { | |
310 | cancel_delayed_work(®->hr_write_timeout_work); | |
311 | flush_scheduled_work(); | |
312 | } | |
313 | ||
b559292e | 314 | static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc) |
a7f6a5fb | 315 | { |
b559292e | 316 | atomic_set(&wc->wc_num_reqs, 1); |
a7f6a5fb | 317 | init_completion(&wc->wc_io_complete); |
a9e2ae39 | 318 | wc->wc_error = 0; |
a7f6a5fb MF |
319 | } |
320 | ||
321 | /* Used in error paths too */ | |
322 | static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc, | |
323 | unsigned int num) | |
324 | { | |
325 | /* sadly atomic_sub_and_test() isn't available on all platforms. The | |
326 | * good news is that the fast path only completes one at a time */ | |
327 | while(num--) { | |
328 | if (atomic_dec_and_test(&wc->wc_num_reqs)) { | |
329 | BUG_ON(num > 0); | |
330 | complete(&wc->wc_io_complete); | |
331 | } | |
332 | } | |
333 | } | |
334 | ||
335 | static void o2hb_wait_on_io(struct o2hb_region *reg, | |
336 | struct o2hb_bio_wait_ctxt *wc) | |
337 | { | |
338 | struct address_space *mapping = reg->hr_bdev->bd_inode->i_mapping; | |
339 | ||
340 | blk_run_address_space(mapping); | |
b559292e | 341 | o2hb_bio_wait_dec(wc, 1); |
a7f6a5fb MF |
342 | |
343 | wait_for_completion(&wc->wc_io_complete); | |
344 | } | |
345 | ||
782e3b3b | 346 | static void o2hb_bio_end_io(struct bio *bio, |
a7f6a5fb MF |
347 | int error) |
348 | { | |
349 | struct o2hb_bio_wait_ctxt *wc = bio->bi_private; | |
350 | ||
a9e2ae39 | 351 | if (error) { |
a7f6a5fb | 352 | mlog(ML_ERROR, "IO Error %d\n", error); |
a9e2ae39 MF |
353 | wc->wc_error = error; |
354 | } | |
a7f6a5fb | 355 | |
a7f6a5fb | 356 | o2hb_bio_wait_dec(wc, 1); |
b559292e | 357 | bio_put(bio); |
a7f6a5fb MF |
358 | } |
359 | ||
360 | /* Setup a Bio to cover I/O against num_slots slots starting at | |
361 | * start_slot. */ | |
362 | static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, | |
363 | struct o2hb_bio_wait_ctxt *wc, | |
b559292e PR |
364 | unsigned int *current_slot, |
365 | unsigned int max_slots) | |
a7f6a5fb | 366 | { |
b559292e | 367 | int len, current_page; |
a7f6a5fb MF |
368 | unsigned int vec_len, vec_start; |
369 | unsigned int bits = reg->hr_block_bits; | |
370 | unsigned int spp = reg->hr_slots_per_page; | |
b559292e | 371 | unsigned int cs = *current_slot; |
a7f6a5fb MF |
372 | struct bio *bio; |
373 | struct page *page; | |
374 | ||
a7f6a5fb MF |
375 | /* Testing has shown this allocation to take long enough under |
376 | * GFP_KERNEL that the local node can get fenced. It would be | |
377 | * nicest if we could pre-allocate these bios and avoid this | |
378 | * all together. */ | |
b559292e | 379 | bio = bio_alloc(GFP_ATOMIC, 16); |
a7f6a5fb MF |
380 | if (!bio) { |
381 | mlog(ML_ERROR, "Could not alloc slots BIO!\n"); | |
382 | bio = ERR_PTR(-ENOMEM); | |
383 | goto bail; | |
384 | } | |
385 | ||
386 | /* Must put everything in 512 byte sectors for the bio... */ | |
b559292e | 387 | bio->bi_sector = (reg->hr_start_block + cs) << (bits - 9); |
a7f6a5fb MF |
388 | bio->bi_bdev = reg->hr_bdev; |
389 | bio->bi_private = wc; | |
390 | bio->bi_end_io = o2hb_bio_end_io; | |
391 | ||
b559292e PR |
392 | vec_start = (cs << bits) % PAGE_CACHE_SIZE; |
393 | while(cs < max_slots) { | |
394 | current_page = cs / spp; | |
395 | page = reg->hr_slot_data[current_page]; | |
a7f6a5fb | 396 | |
bc7e97cb | 397 | vec_len = min(PAGE_CACHE_SIZE - vec_start, |
b559292e | 398 | (max_slots-cs) * (PAGE_CACHE_SIZE/spp) ); |
a7f6a5fb MF |
399 | |
400 | mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", | |
b559292e | 401 | current_page, vec_len, vec_start); |
a7f6a5fb MF |
402 | |
403 | len = bio_add_page(bio, page, vec_len, vec_start); | |
b559292e | 404 | if (len != vec_len) break; |
a7f6a5fb | 405 | |
b559292e | 406 | cs += vec_len / (PAGE_CACHE_SIZE/spp); |
a7f6a5fb MF |
407 | vec_start = 0; |
408 | } | |
409 | ||
410 | bail: | |
b559292e | 411 | *current_slot = cs; |
a7f6a5fb MF |
412 | return bio; |
413 | } | |
414 | ||
a7f6a5fb MF |
415 | static int o2hb_read_slots(struct o2hb_region *reg, |
416 | unsigned int max_slots) | |
417 | { | |
b559292e PR |
418 | unsigned int current_slot=0; |
419 | int status; | |
a7f6a5fb | 420 | struct o2hb_bio_wait_ctxt wc; |
a7f6a5fb MF |
421 | struct bio *bio; |
422 | ||
b559292e | 423 | o2hb_bio_wait_init(&wc); |
a7f6a5fb | 424 | |
b559292e PR |
425 | while(current_slot < max_slots) { |
426 | bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots); | |
a7f6a5fb | 427 | if (IS_ERR(bio)) { |
a7f6a5fb MF |
428 | status = PTR_ERR(bio); |
429 | mlog_errno(status); | |
430 | goto bail_and_wait; | |
431 | } | |
a7f6a5fb | 432 | |
b559292e | 433 | atomic_inc(&wc.wc_num_reqs); |
a7f6a5fb MF |
434 | submit_bio(READ, bio); |
435 | } | |
436 | ||
437 | status = 0; | |
438 | ||
439 | bail_and_wait: | |
440 | o2hb_wait_on_io(reg, &wc); | |
a9e2ae39 MF |
441 | if (wc.wc_error && !status) |
442 | status = wc.wc_error; | |
a7f6a5fb | 443 | |
a7f6a5fb MF |
444 | return status; |
445 | } | |
446 | ||
447 | static int o2hb_issue_node_write(struct o2hb_region *reg, | |
a7f6a5fb MF |
448 | struct o2hb_bio_wait_ctxt *write_wc) |
449 | { | |
450 | int status; | |
451 | unsigned int slot; | |
452 | struct bio *bio; | |
453 | ||
b559292e | 454 | o2hb_bio_wait_init(write_wc); |
a7f6a5fb MF |
455 | |
456 | slot = o2nm_this_node(); | |
457 | ||
b559292e | 458 | bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1); |
a7f6a5fb MF |
459 | if (IS_ERR(bio)) { |
460 | status = PTR_ERR(bio); | |
461 | mlog_errno(status); | |
462 | goto bail; | |
463 | } | |
464 | ||
b559292e | 465 | atomic_inc(&write_wc->wc_num_reqs); |
a7f6a5fb MF |
466 | submit_bio(WRITE, bio); |
467 | ||
a7f6a5fb MF |
468 | status = 0; |
469 | bail: | |
470 | return status; | |
471 | } | |
472 | ||
473 | static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, | |
474 | struct o2hb_disk_heartbeat_block *hb_block) | |
475 | { | |
476 | __le32 old_cksum; | |
477 | u32 ret; | |
478 | ||
479 | /* We want to compute the block crc with a 0 value in the | |
480 | * hb_cksum field. Save it off here and replace after the | |
481 | * crc. */ | |
482 | old_cksum = hb_block->hb_cksum; | |
483 | hb_block->hb_cksum = 0; | |
484 | ||
485 | ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); | |
486 | ||
487 | hb_block->hb_cksum = old_cksum; | |
488 | ||
489 | return ret; | |
490 | } | |
491 | ||
492 | static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) | |
493 | { | |
70bacbdb MF |
494 | mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, " |
495 | "cksum = 0x%x, generation 0x%llx\n", | |
496 | (long long)le64_to_cpu(hb_block->hb_seq), | |
497 | hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum), | |
498 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
499 | } |
500 | ||
501 | static int o2hb_verify_crc(struct o2hb_region *reg, | |
502 | struct o2hb_disk_heartbeat_block *hb_block) | |
503 | { | |
504 | u32 read, computed; | |
505 | ||
506 | read = le32_to_cpu(hb_block->hb_cksum); | |
507 | computed = o2hb_compute_block_crc_le(reg, hb_block); | |
508 | ||
509 | return read == computed; | |
510 | } | |
511 | ||
512 | /* We want to make sure that nobody is heartbeating on top of us -- | |
513 | * this will help detect an invalid configuration. */ | |
514 | static int o2hb_check_last_timestamp(struct o2hb_region *reg) | |
515 | { | |
516 | int node_num, ret; | |
517 | struct o2hb_disk_slot *slot; | |
518 | struct o2hb_disk_heartbeat_block *hb_block; | |
519 | ||
520 | node_num = o2nm_this_node(); | |
521 | ||
522 | ret = 1; | |
523 | slot = ®->hr_slots[node_num]; | |
524 | /* Don't check on our 1st timestamp */ | |
525 | if (slot->ds_last_time) { | |
526 | hb_block = slot->ds_raw_block; | |
527 | ||
528 | if (le64_to_cpu(hb_block->hb_seq) != slot->ds_last_time) | |
529 | ret = 0; | |
530 | } | |
531 | ||
532 | return ret; | |
533 | } | |
534 | ||
535 | static inline void o2hb_prepare_block(struct o2hb_region *reg, | |
536 | u64 generation) | |
537 | { | |
538 | int node_num; | |
539 | u64 cputime; | |
540 | struct o2hb_disk_slot *slot; | |
541 | struct o2hb_disk_heartbeat_block *hb_block; | |
542 | ||
543 | node_num = o2nm_this_node(); | |
544 | slot = ®->hr_slots[node_num]; | |
545 | ||
546 | hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; | |
547 | memset(hb_block, 0, reg->hr_block_bytes); | |
548 | /* TODO: time stuff */ | |
549 | cputime = CURRENT_TIME.tv_sec; | |
550 | if (!cputime) | |
551 | cputime = 1; | |
552 | ||
553 | hb_block->hb_seq = cpu_to_le64(cputime); | |
554 | hb_block->hb_node = node_num; | |
555 | hb_block->hb_generation = cpu_to_le64(generation); | |
0db638f4 | 556 | hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS); |
a7f6a5fb MF |
557 | |
558 | /* This step must always happen last! */ | |
559 | hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, | |
560 | hb_block)); | |
561 | ||
70bacbdb | 562 | mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n", |
5fdf1e67 | 563 | (long long)generation, |
70bacbdb | 564 | le32_to_cpu(hb_block->hb_cksum)); |
a7f6a5fb MF |
565 | } |
566 | ||
567 | static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, | |
568 | struct o2nm_node *node, | |
569 | int idx) | |
570 | { | |
571 | struct list_head *iter; | |
572 | struct o2hb_callback_func *f; | |
573 | ||
574 | list_for_each(iter, &hbcall->list) { | |
575 | f = list_entry(iter, struct o2hb_callback_func, hc_item); | |
576 | mlog(ML_HEARTBEAT, "calling funcs %p\n", f); | |
577 | (f->hc_func)(node, idx, f->hc_data); | |
578 | } | |
579 | } | |
580 | ||
581 | /* Will run the list in order until we process the passed event */ | |
582 | static void o2hb_run_event_list(struct o2hb_node_event *queued_event) | |
583 | { | |
584 | int empty; | |
585 | struct o2hb_callback *hbcall; | |
586 | struct o2hb_node_event *event; | |
587 | ||
588 | spin_lock(&o2hb_live_lock); | |
589 | empty = list_empty(&queued_event->hn_item); | |
590 | spin_unlock(&o2hb_live_lock); | |
591 | if (empty) | |
592 | return; | |
593 | ||
594 | /* Holding callback sem assures we don't alter the callback | |
595 | * lists when doing this, and serializes ourselves with other | |
596 | * processes wanting callbacks. */ | |
597 | down_write(&o2hb_callback_sem); | |
598 | ||
599 | spin_lock(&o2hb_live_lock); | |
600 | while (!list_empty(&o2hb_node_events) | |
601 | && !list_empty(&queued_event->hn_item)) { | |
602 | event = list_entry(o2hb_node_events.next, | |
603 | struct o2hb_node_event, | |
604 | hn_item); | |
605 | list_del_init(&event->hn_item); | |
606 | spin_unlock(&o2hb_live_lock); | |
607 | ||
608 | mlog(ML_HEARTBEAT, "Node %s event for %d\n", | |
609 | event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", | |
610 | event->hn_node_num); | |
611 | ||
612 | hbcall = hbcall_from_type(event->hn_event_type); | |
613 | ||
614 | /* We should *never* have gotten on to the list with a | |
615 | * bad type... This isn't something that we should try | |
616 | * to recover from. */ | |
617 | BUG_ON(IS_ERR(hbcall)); | |
618 | ||
619 | o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); | |
620 | ||
621 | spin_lock(&o2hb_live_lock); | |
622 | } | |
623 | spin_unlock(&o2hb_live_lock); | |
624 | ||
625 | up_write(&o2hb_callback_sem); | |
626 | } | |
627 | ||
628 | static void o2hb_queue_node_event(struct o2hb_node_event *event, | |
629 | enum o2hb_callback_type type, | |
630 | struct o2nm_node *node, | |
631 | int node_num) | |
632 | { | |
633 | assert_spin_locked(&o2hb_live_lock); | |
634 | ||
0e105d37 SM |
635 | BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB)); |
636 | ||
a7f6a5fb MF |
637 | event->hn_event_type = type; |
638 | event->hn_node = node; | |
639 | event->hn_node_num = node_num; | |
640 | ||
641 | mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", | |
642 | type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); | |
643 | ||
644 | list_add_tail(&event->hn_item, &o2hb_node_events); | |
645 | } | |
646 | ||
647 | static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) | |
648 | { | |
649 | struct o2hb_node_event event = | |
650 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
651 | struct o2nm_node *node; | |
652 | ||
653 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
654 | if (!node) | |
655 | return; | |
656 | ||
657 | spin_lock(&o2hb_live_lock); | |
658 | if (!list_empty(&slot->ds_live_item)) { | |
659 | mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", | |
660 | slot->ds_node_num); | |
661 | ||
662 | list_del_init(&slot->ds_live_item); | |
663 | ||
664 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
665 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
666 | ||
667 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
668 | slot->ds_node_num); | |
669 | } | |
670 | } | |
671 | spin_unlock(&o2hb_live_lock); | |
672 | ||
673 | o2hb_run_event_list(&event); | |
674 | ||
675 | o2nm_node_put(node); | |
676 | } | |
677 | ||
43182d2a SM |
678 | static void o2hb_set_quorum_device(struct o2hb_region *reg, |
679 | struct o2hb_disk_slot *slot) | |
680 | { | |
681 | assert_spin_locked(&o2hb_live_lock); | |
682 | ||
683 | if (!o2hb_global_heartbeat_active()) | |
684 | return; | |
685 | ||
686 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
687 | return; | |
688 | ||
689 | /* | |
690 | * A region can be added to the quorum only when it sees all | |
691 | * live nodes heartbeat on it. In other words, the region has been | |
692 | * added to all nodes. | |
693 | */ | |
694 | if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap, | |
695 | sizeof(o2hb_live_node_bitmap))) | |
696 | return; | |
697 | ||
698 | if (slot->ds_changed_samples < O2HB_LIVE_THRESHOLD) | |
699 | return; | |
700 | ||
701 | printk(KERN_NOTICE "o2hb: Region %s is now a quorum device\n", | |
702 | config_item_name(®->hr_item)); | |
703 | ||
704 | set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
705 | } | |
706 | ||
a7f6a5fb MF |
707 | static int o2hb_check_slot(struct o2hb_region *reg, |
708 | struct o2hb_disk_slot *slot) | |
709 | { | |
710 | int changed = 0, gen_changed = 0; | |
711 | struct o2hb_node_event event = | |
712 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
713 | struct o2nm_node *node; | |
714 | struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; | |
715 | u64 cputime; | |
0db638f4 MF |
716 | unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS; |
717 | unsigned int slot_dead_ms; | |
0e105d37 | 718 | int tmp; |
a7f6a5fb MF |
719 | |
720 | memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); | |
721 | ||
0e105d37 SM |
722 | /* |
723 | * If a node is no longer configured but is still in the livemap, we | |
724 | * may need to clear that bit from the livemap. | |
725 | */ | |
a7f6a5fb | 726 | node = o2nm_get_node_by_num(slot->ds_node_num); |
0e105d37 SM |
727 | if (!node) { |
728 | spin_lock(&o2hb_live_lock); | |
729 | tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
730 | spin_unlock(&o2hb_live_lock); | |
731 | if (!tmp) | |
732 | return 0; | |
733 | } | |
a7f6a5fb MF |
734 | |
735 | if (!o2hb_verify_crc(reg, hb_block)) { | |
736 | /* all paths from here will drop o2hb_live_lock for | |
737 | * us. */ | |
738 | spin_lock(&o2hb_live_lock); | |
739 | ||
740 | /* Don't print an error on the console in this case - | |
741 | * a freshly formatted heartbeat area will not have a | |
742 | * crc set on it. */ | |
743 | if (list_empty(&slot->ds_live_item)) | |
744 | goto out; | |
745 | ||
746 | /* The node is live but pushed out a bad crc. We | |
747 | * consider it a transient miss but don't populate any | |
748 | * other values as they may be junk. */ | |
749 | mlog(ML_ERROR, "Node %d has written a bad crc to %s\n", | |
750 | slot->ds_node_num, reg->hr_dev_name); | |
751 | o2hb_dump_slot(hb_block); | |
752 | ||
753 | slot->ds_equal_samples++; | |
754 | goto fire_callbacks; | |
755 | } | |
756 | ||
757 | /* we don't care if these wrap.. the state transitions below | |
758 | * clear at the right places */ | |
759 | cputime = le64_to_cpu(hb_block->hb_seq); | |
760 | if (slot->ds_last_time != cputime) | |
761 | slot->ds_changed_samples++; | |
762 | else | |
763 | slot->ds_equal_samples++; | |
764 | slot->ds_last_time = cputime; | |
765 | ||
766 | /* The node changed heartbeat generations. We assume this to | |
767 | * mean it dropped off but came back before we timed out. We | |
768 | * want to consider it down for the time being but don't want | |
769 | * to lose any changed_samples state we might build up to | |
770 | * considering it live again. */ | |
771 | if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { | |
772 | gen_changed = 1; | |
773 | slot->ds_equal_samples = 0; | |
70bacbdb MF |
774 | mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx " |
775 | "to 0x%llx)\n", slot->ds_node_num, | |
776 | (long long)slot->ds_last_generation, | |
777 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
778 | } |
779 | ||
780 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
781 | ||
70bacbdb MF |
782 | mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x " |
783 | "seq %llu last %llu changed %u equal %u\n", | |
784 | slot->ds_node_num, (long long)slot->ds_last_generation, | |
785 | le32_to_cpu(hb_block->hb_cksum), | |
2bd63216 | 786 | (unsigned long long)le64_to_cpu(hb_block->hb_seq), |
70bacbdb | 787 | (unsigned long long)slot->ds_last_time, slot->ds_changed_samples, |
a7f6a5fb MF |
788 | slot->ds_equal_samples); |
789 | ||
790 | spin_lock(&o2hb_live_lock); | |
791 | ||
792 | fire_callbacks: | |
793 | /* dead nodes only come to life after some number of | |
794 | * changes at any time during their dead time */ | |
795 | if (list_empty(&slot->ds_live_item) && | |
796 | slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { | |
70bacbdb MF |
797 | mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n", |
798 | slot->ds_node_num, (long long)slot->ds_last_generation); | |
a7f6a5fb | 799 | |
823a637a SM |
800 | set_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
801 | ||
a7f6a5fb MF |
802 | /* first on the list generates a callback */ |
803 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
804 | mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes " |
805 | "bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
806 | set_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
807 | ||
808 | o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, | |
809 | slot->ds_node_num); | |
810 | ||
811 | changed = 1; | |
812 | } | |
813 | ||
814 | list_add_tail(&slot->ds_live_item, | |
815 | &o2hb_live_slots[slot->ds_node_num]); | |
816 | ||
817 | slot->ds_equal_samples = 0; | |
0db638f4 MF |
818 | |
819 | /* We want to be sure that all nodes agree on the | |
820 | * number of milliseconds before a node will be | |
821 | * considered dead. The self-fencing timeout is | |
822 | * computed from this value, and a discrepancy might | |
823 | * result in heartbeat calling a node dead when it | |
824 | * hasn't self-fenced yet. */ | |
825 | slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms); | |
826 | if (slot_dead_ms && slot_dead_ms != dead_ms) { | |
827 | /* TODO: Perhaps we can fail the region here. */ | |
828 | mlog(ML_ERROR, "Node %d on device %s has a dead count " | |
829 | "of %u ms, but our count is %u ms.\n" | |
830 | "Please double check your configuration values " | |
831 | "for 'O2CB_HEARTBEAT_THRESHOLD'\n", | |
832 | slot->ds_node_num, reg->hr_dev_name, slot_dead_ms, | |
833 | dead_ms); | |
834 | } | |
a7f6a5fb MF |
835 | goto out; |
836 | } | |
837 | ||
838 | /* if the list is dead, we're done.. */ | |
839 | if (list_empty(&slot->ds_live_item)) | |
840 | goto out; | |
841 | ||
842 | /* live nodes only go dead after enough consequtive missed | |
843 | * samples.. reset the missed counter whenever we see | |
844 | * activity */ | |
845 | if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { | |
846 | mlog(ML_HEARTBEAT, "Node %d left my region\n", | |
847 | slot->ds_node_num); | |
848 | ||
823a637a SM |
849 | clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
850 | ||
a7f6a5fb MF |
851 | /* last off the live_slot generates a callback */ |
852 | list_del_init(&slot->ds_live_item); | |
853 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
854 | mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live " |
855 | "nodes bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
856 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
857 | ||
0e105d37 SM |
858 | /* node can be null */ |
859 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, | |
860 | node, slot->ds_node_num); | |
a7f6a5fb MF |
861 | |
862 | changed = 1; | |
863 | } | |
864 | ||
865 | /* We don't clear this because the node is still | |
866 | * actually writing new blocks. */ | |
867 | if (!gen_changed) | |
868 | slot->ds_changed_samples = 0; | |
869 | goto out; | |
870 | } | |
871 | if (slot->ds_changed_samples) { | |
872 | slot->ds_changed_samples = 0; | |
873 | slot->ds_equal_samples = 0; | |
874 | } | |
875 | out: | |
43182d2a SM |
876 | o2hb_set_quorum_device(reg, slot); |
877 | ||
a7f6a5fb MF |
878 | spin_unlock(&o2hb_live_lock); |
879 | ||
880 | o2hb_run_event_list(&event); | |
881 | ||
0e105d37 SM |
882 | if (node) |
883 | o2nm_node_put(node); | |
a7f6a5fb MF |
884 | return changed; |
885 | } | |
886 | ||
887 | /* This could be faster if we just implmented a find_last_bit, but I | |
888 | * don't think the circumstances warrant it. */ | |
889 | static int o2hb_highest_node(unsigned long *nodes, | |
890 | int numbits) | |
891 | { | |
892 | int highest, node; | |
893 | ||
894 | highest = numbits; | |
895 | node = -1; | |
896 | while ((node = find_next_bit(nodes, numbits, node + 1)) != -1) { | |
897 | if (node >= numbits) | |
898 | break; | |
899 | ||
900 | highest = node; | |
901 | } | |
902 | ||
903 | return highest; | |
904 | } | |
905 | ||
a9e2ae39 | 906 | static int o2hb_do_disk_heartbeat(struct o2hb_region *reg) |
a7f6a5fb MF |
907 | { |
908 | int i, ret, highest_node, change = 0; | |
909 | unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
0e105d37 | 910 | unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
a7f6a5fb MF |
911 | struct o2hb_bio_wait_ctxt write_wc; |
912 | ||
a9e2ae39 MF |
913 | ret = o2nm_configured_node_map(configured_nodes, |
914 | sizeof(configured_nodes)); | |
915 | if (ret) { | |
916 | mlog_errno(ret); | |
917 | return ret; | |
918 | } | |
a7f6a5fb | 919 | |
0e105d37 SM |
920 | /* |
921 | * If a node is not configured but is in the livemap, we still need | |
922 | * to read the slot so as to be able to remove it from the livemap. | |
923 | */ | |
924 | o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap)); | |
925 | i = -1; | |
926 | while ((i = find_next_bit(live_node_bitmap, | |
927 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
928 | set_bit(i, configured_nodes); | |
929 | } | |
930 | ||
a7f6a5fb MF |
931 | highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); |
932 | if (highest_node >= O2NM_MAX_NODES) { | |
933 | mlog(ML_NOTICE, "ocfs2_heartbeat: no configured nodes found!\n"); | |
a9e2ae39 | 934 | return -EINVAL; |
a7f6a5fb MF |
935 | } |
936 | ||
937 | /* No sense in reading the slots of nodes that don't exist | |
938 | * yet. Of course, if the node definitions have holes in them | |
939 | * then we're reading an empty slot anyway... Consider this | |
940 | * best-effort. */ | |
941 | ret = o2hb_read_slots(reg, highest_node + 1); | |
942 | if (ret < 0) { | |
943 | mlog_errno(ret); | |
a9e2ae39 | 944 | return ret; |
a7f6a5fb MF |
945 | } |
946 | ||
947 | /* With an up to date view of the slots, we can check that no | |
948 | * other node has been improperly configured to heartbeat in | |
949 | * our slot. */ | |
950 | if (!o2hb_check_last_timestamp(reg)) | |
951 | mlog(ML_ERROR, "Device \"%s\": another node is heartbeating " | |
952 | "in our slot!\n", reg->hr_dev_name); | |
953 | ||
954 | /* fill in the proper info for our next heartbeat */ | |
955 | o2hb_prepare_block(reg, reg->hr_generation); | |
956 | ||
957 | /* And fire off the write. Note that we don't wait on this I/O | |
958 | * until later. */ | |
b559292e | 959 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
960 | if (ret < 0) { |
961 | mlog_errno(ret); | |
a9e2ae39 | 962 | return ret; |
a7f6a5fb MF |
963 | } |
964 | ||
965 | i = -1; | |
966 | while((i = find_next_bit(configured_nodes, O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
967 | ||
968 | change |= o2hb_check_slot(reg, ®->hr_slots[i]); | |
969 | } | |
970 | ||
971 | /* | |
972 | * We have to be sure we've advertised ourselves on disk | |
973 | * before we can go to steady state. This ensures that | |
974 | * people we find in our steady state have seen us. | |
975 | */ | |
976 | o2hb_wait_on_io(reg, &write_wc); | |
a9e2ae39 MF |
977 | if (write_wc.wc_error) { |
978 | /* Do not re-arm the write timeout on I/O error - we | |
979 | * can't be sure that the new block ever made it to | |
980 | * disk */ | |
981 | mlog(ML_ERROR, "Write error %d on device \"%s\"\n", | |
982 | write_wc.wc_error, reg->hr_dev_name); | |
983 | return write_wc.wc_error; | |
984 | } | |
985 | ||
a7f6a5fb MF |
986 | o2hb_arm_write_timeout(reg); |
987 | ||
988 | /* let the person who launched us know when things are steady */ | |
989 | if (!change && (atomic_read(®->hr_steady_iterations) != 0)) { | |
990 | if (atomic_dec_and_test(®->hr_steady_iterations)) | |
991 | wake_up(&o2hb_steady_queue); | |
992 | } | |
a9e2ae39 MF |
993 | |
994 | return 0; | |
a7f6a5fb MF |
995 | } |
996 | ||
997 | /* Subtract b from a, storing the result in a. a *must* have a larger | |
998 | * value than b. */ | |
999 | static void o2hb_tv_subtract(struct timeval *a, | |
1000 | struct timeval *b) | |
1001 | { | |
1002 | /* just return 0 when a is after b */ | |
1003 | if (a->tv_sec < b->tv_sec || | |
1004 | (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec)) { | |
1005 | a->tv_sec = 0; | |
1006 | a->tv_usec = 0; | |
1007 | return; | |
1008 | } | |
1009 | ||
1010 | a->tv_sec -= b->tv_sec; | |
1011 | a->tv_usec -= b->tv_usec; | |
1012 | while ( a->tv_usec < 0 ) { | |
1013 | a->tv_sec--; | |
1014 | a->tv_usec += 1000000; | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | static unsigned int o2hb_elapsed_msecs(struct timeval *start, | |
1019 | struct timeval *end) | |
1020 | { | |
1021 | struct timeval res = *end; | |
1022 | ||
1023 | o2hb_tv_subtract(&res, start); | |
1024 | ||
1025 | return res.tv_sec * 1000 + res.tv_usec / 1000; | |
1026 | } | |
1027 | ||
1028 | /* | |
1029 | * we ride the region ref that the region dir holds. before the region | |
1030 | * dir is removed and drops it ref it will wait to tear down this | |
1031 | * thread. | |
1032 | */ | |
1033 | static int o2hb_thread(void *data) | |
1034 | { | |
1035 | int i, ret; | |
1036 | struct o2hb_region *reg = data; | |
a7f6a5fb MF |
1037 | struct o2hb_bio_wait_ctxt write_wc; |
1038 | struct timeval before_hb, after_hb; | |
1039 | unsigned int elapsed_msec; | |
1040 | ||
1041 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); | |
1042 | ||
1043 | set_user_nice(current, -20); | |
1044 | ||
1045 | while (!kthread_should_stop() && !reg->hr_unclean_stop) { | |
1046 | /* We track the time spent inside | |
025dfdaf | 1047 | * o2hb_do_disk_heartbeat so that we avoid more than |
a7f6a5fb MF |
1048 | * hr_timeout_ms between disk writes. On busy systems |
1049 | * this should result in a heartbeat which is less | |
1050 | * likely to time itself out. */ | |
1051 | do_gettimeofday(&before_hb); | |
1052 | ||
a9e2ae39 MF |
1053 | i = 0; |
1054 | do { | |
1055 | ret = o2hb_do_disk_heartbeat(reg); | |
1056 | } while (ret && ++i < 2); | |
a7f6a5fb MF |
1057 | |
1058 | do_gettimeofday(&after_hb); | |
1059 | elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb); | |
1060 | ||
b31d308d TM |
1061 | mlog(ML_HEARTBEAT, |
1062 | "start = %lu.%lu, end = %lu.%lu, msec = %u\n", | |
215c7f9f MF |
1063 | before_hb.tv_sec, (unsigned long) before_hb.tv_usec, |
1064 | after_hb.tv_sec, (unsigned long) after_hb.tv_usec, | |
1065 | elapsed_msec); | |
a7f6a5fb MF |
1066 | |
1067 | if (elapsed_msec < reg->hr_timeout_ms) { | |
1068 | /* the kthread api has blocked signals for us so no | |
1069 | * need to record the return value. */ | |
1070 | msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); | |
1071 | } | |
1072 | } | |
1073 | ||
1074 | o2hb_disarm_write_timeout(reg); | |
1075 | ||
1076 | /* unclean stop is only used in very bad situation */ | |
1077 | for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) | |
1078 | o2hb_shutdown_slot(®->hr_slots[i]); | |
1079 | ||
1080 | /* Explicit down notification - avoid forcing the other nodes | |
1081 | * to timeout on this region when we could just as easily | |
1082 | * write a clear generation - thus indicating to them that | |
1083 | * this node has left this region. | |
1084 | * | |
1085 | * XXX: Should we skip this on unclean_stop? */ | |
1086 | o2hb_prepare_block(reg, 0); | |
b559292e | 1087 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
1088 | if (ret == 0) { |
1089 | o2hb_wait_on_io(reg, &write_wc); | |
a7f6a5fb MF |
1090 | } else { |
1091 | mlog_errno(ret); | |
1092 | } | |
1093 | ||
1094 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread exiting\n"); | |
1095 | ||
1096 | return 0; | |
1097 | } | |
1098 | ||
87d3d3f3 SM |
1099 | #ifdef CONFIG_DEBUG_FS |
1100 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1101 | { | |
8ca8b0bb | 1102 | struct o2hb_debug_buf *db = inode->i_private; |
1f285305 | 1103 | struct o2hb_region *reg; |
87d3d3f3 SM |
1104 | unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
1105 | char *buf = NULL; | |
1106 | int i = -1; | |
1107 | int out = 0; | |
1108 | ||
8ca8b0bb SM |
1109 | /* max_nodes should be the largest bitmap we pass here */ |
1110 | BUG_ON(sizeof(map) < db->db_size); | |
1111 | ||
87d3d3f3 SM |
1112 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
1113 | if (!buf) | |
1114 | goto bail; | |
1115 | ||
8ca8b0bb SM |
1116 | switch (db->db_type) { |
1117 | case O2HB_DB_TYPE_LIVENODES: | |
a6de0136 SM |
1118 | case O2HB_DB_TYPE_LIVEREGIONS: |
1119 | case O2HB_DB_TYPE_QUORUMREGIONS: | |
1120 | case O2HB_DB_TYPE_FAILEDREGIONS: | |
8ca8b0bb SM |
1121 | spin_lock(&o2hb_live_lock); |
1122 | memcpy(map, db->db_data, db->db_size); | |
1123 | spin_unlock(&o2hb_live_lock); | |
1124 | break; | |
87d3d3f3 | 1125 | |
1f285305 SM |
1126 | case O2HB_DB_TYPE_REGION_LIVENODES: |
1127 | spin_lock(&o2hb_live_lock); | |
1128 | reg = (struct o2hb_region *)db->db_data; | |
1129 | memcpy(map, reg->hr_live_node_bitmap, db->db_size); | |
1130 | spin_unlock(&o2hb_live_lock); | |
1131 | break; | |
1132 | ||
1133 | case O2HB_DB_TYPE_REGION_NUMBER: | |
1134 | reg = (struct o2hb_region *)db->db_data; | |
1135 | out += snprintf(buf + out, PAGE_SIZE - out, "%d\n", | |
1136 | reg->hr_region_num); | |
1137 | goto done; | |
1138 | ||
43695d09 SM |
1139 | case O2HB_DB_TYPE_REGION_ELAPSED_TIME: |
1140 | reg = (struct o2hb_region *)db->db_data; | |
1141 | out += snprintf(buf + out, PAGE_SIZE - out, "%u\n", | |
1142 | jiffies_to_msecs(jiffies - | |
1143 | reg->hr_last_timeout_start)); | |
1144 | goto done; | |
1145 | ||
8ca8b0bb SM |
1146 | default: |
1147 | goto done; | |
1148 | } | |
1149 | ||
1150 | while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len) | |
87d3d3f3 SM |
1151 | out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i); |
1152 | out += snprintf(buf + out, PAGE_SIZE - out, "\n"); | |
1153 | ||
8ca8b0bb | 1154 | done: |
87d3d3f3 SM |
1155 | i_size_write(inode, out); |
1156 | ||
1157 | file->private_data = buf; | |
1158 | ||
1159 | return 0; | |
1160 | bail: | |
1161 | return -ENOMEM; | |
1162 | } | |
1163 | ||
1164 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1165 | { | |
1166 | kfree(file->private_data); | |
1167 | return 0; | |
1168 | } | |
1169 | ||
1170 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1171 | size_t nbytes, loff_t *ppos) | |
1172 | { | |
1173 | return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, | |
1174 | i_size_read(file->f_mapping->host)); | |
1175 | } | |
1176 | #else | |
1177 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1178 | { | |
1179 | return 0; | |
1180 | } | |
1181 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1182 | { | |
1183 | return 0; | |
1184 | } | |
1185 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1186 | size_t nbytes, loff_t *ppos) | |
1187 | { | |
1188 | return 0; | |
1189 | } | |
1190 | #endif /* CONFIG_DEBUG_FS */ | |
1191 | ||
828c0950 | 1192 | static const struct file_operations o2hb_debug_fops = { |
87d3d3f3 SM |
1193 | .open = o2hb_debug_open, |
1194 | .release = o2hb_debug_release, | |
1195 | .read = o2hb_debug_read, | |
1196 | .llseek = generic_file_llseek, | |
1197 | }; | |
1198 | ||
1199 | void o2hb_exit(void) | |
1200 | { | |
8ca8b0bb | 1201 | kfree(o2hb_db_livenodes); |
a6de0136 SM |
1202 | kfree(o2hb_db_liveregions); |
1203 | kfree(o2hb_db_quorumregions); | |
1204 | kfree(o2hb_db_failedregions); | |
1205 | debugfs_remove(o2hb_debug_failedregions); | |
1206 | debugfs_remove(o2hb_debug_quorumregions); | |
1207 | debugfs_remove(o2hb_debug_liveregions); | |
8ca8b0bb SM |
1208 | debugfs_remove(o2hb_debug_livenodes); |
1209 | debugfs_remove(o2hb_debug_dir); | |
1210 | } | |
1211 | ||
1212 | static struct dentry *o2hb_debug_create(const char *name, struct dentry *dir, | |
1213 | struct o2hb_debug_buf **db, int db_len, | |
1214 | int type, int size, int len, void *data) | |
1215 | { | |
1216 | *db = kmalloc(db_len, GFP_KERNEL); | |
1217 | if (!*db) | |
1218 | return NULL; | |
1219 | ||
1220 | (*db)->db_type = type; | |
1221 | (*db)->db_size = size; | |
1222 | (*db)->db_len = len; | |
1223 | (*db)->db_data = data; | |
1224 | ||
1225 | return debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db, | |
1226 | &o2hb_debug_fops); | |
1227 | } | |
1228 | ||
1229 | static int o2hb_debug_init(void) | |
1230 | { | |
1231 | int ret = -ENOMEM; | |
1232 | ||
1233 | o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL); | |
1234 | if (!o2hb_debug_dir) { | |
1235 | mlog_errno(ret); | |
1236 | goto bail; | |
1237 | } | |
1238 | ||
1239 | o2hb_debug_livenodes = o2hb_debug_create(O2HB_DEBUG_LIVENODES, | |
1240 | o2hb_debug_dir, | |
1241 | &o2hb_db_livenodes, | |
1242 | sizeof(*o2hb_db_livenodes), | |
1243 | O2HB_DB_TYPE_LIVENODES, | |
1244 | sizeof(o2hb_live_node_bitmap), | |
1245 | O2NM_MAX_NODES, | |
1246 | o2hb_live_node_bitmap); | |
1247 | if (!o2hb_debug_livenodes) { | |
1248 | mlog_errno(ret); | |
1249 | goto bail; | |
1250 | } | |
a6de0136 SM |
1251 | |
1252 | o2hb_debug_liveregions = o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS, | |
1253 | o2hb_debug_dir, | |
1254 | &o2hb_db_liveregions, | |
1255 | sizeof(*o2hb_db_liveregions), | |
1256 | O2HB_DB_TYPE_LIVEREGIONS, | |
1257 | sizeof(o2hb_live_region_bitmap), | |
1258 | O2NM_MAX_REGIONS, | |
1259 | o2hb_live_region_bitmap); | |
1260 | if (!o2hb_debug_liveregions) { | |
1261 | mlog_errno(ret); | |
1262 | goto bail; | |
1263 | } | |
1264 | ||
1265 | o2hb_debug_quorumregions = | |
1266 | o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS, | |
1267 | o2hb_debug_dir, | |
1268 | &o2hb_db_quorumregions, | |
1269 | sizeof(*o2hb_db_quorumregions), | |
1270 | O2HB_DB_TYPE_QUORUMREGIONS, | |
1271 | sizeof(o2hb_quorum_region_bitmap), | |
1272 | O2NM_MAX_REGIONS, | |
1273 | o2hb_quorum_region_bitmap); | |
1274 | if (!o2hb_debug_quorumregions) { | |
1275 | mlog_errno(ret); | |
1276 | goto bail; | |
1277 | } | |
1278 | ||
1279 | o2hb_debug_failedregions = | |
1280 | o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS, | |
1281 | o2hb_debug_dir, | |
1282 | &o2hb_db_failedregions, | |
1283 | sizeof(*o2hb_db_failedregions), | |
1284 | O2HB_DB_TYPE_FAILEDREGIONS, | |
1285 | sizeof(o2hb_failed_region_bitmap), | |
1286 | O2NM_MAX_REGIONS, | |
1287 | o2hb_failed_region_bitmap); | |
1288 | if (!o2hb_debug_failedregions) { | |
1289 | mlog_errno(ret); | |
1290 | goto bail; | |
1291 | } | |
1292 | ||
8ca8b0bb SM |
1293 | ret = 0; |
1294 | bail: | |
1295 | if (ret) | |
1296 | o2hb_exit(); | |
1297 | ||
1298 | return ret; | |
87d3d3f3 SM |
1299 | } |
1300 | ||
1301 | int o2hb_init(void) | |
a7f6a5fb MF |
1302 | { |
1303 | int i; | |
1304 | ||
1305 | for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) | |
1306 | INIT_LIST_HEAD(&o2hb_callbacks[i].list); | |
1307 | ||
1308 | for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) | |
1309 | INIT_LIST_HEAD(&o2hb_live_slots[i]); | |
1310 | ||
1311 | INIT_LIST_HEAD(&o2hb_node_events); | |
1312 | ||
1313 | memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap)); | |
536f0741 | 1314 | memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap)); |
e7d656ba | 1315 | memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap)); |
43182d2a | 1316 | memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap)); |
b1c5ebfb | 1317 | memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap)); |
87d3d3f3 | 1318 | |
8ca8b0bb | 1319 | return o2hb_debug_init(); |
a7f6a5fb MF |
1320 | } |
1321 | ||
1322 | /* if we're already in a callback then we're already serialized by the sem */ | |
1323 | static void o2hb_fill_node_map_from_callback(unsigned long *map, | |
1324 | unsigned bytes) | |
1325 | { | |
1326 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); | |
1327 | ||
1328 | memcpy(map, &o2hb_live_node_bitmap, bytes); | |
1329 | } | |
1330 | ||
1331 | /* | |
1332 | * get a map of all nodes that are heartbeating in any regions | |
1333 | */ | |
1334 | void o2hb_fill_node_map(unsigned long *map, unsigned bytes) | |
1335 | { | |
1336 | /* callers want to serialize this map and callbacks so that they | |
1337 | * can trust that they don't miss nodes coming to the party */ | |
1338 | down_read(&o2hb_callback_sem); | |
1339 | spin_lock(&o2hb_live_lock); | |
1340 | o2hb_fill_node_map_from_callback(map, bytes); | |
1341 | spin_unlock(&o2hb_live_lock); | |
1342 | up_read(&o2hb_callback_sem); | |
1343 | } | |
1344 | EXPORT_SYMBOL_GPL(o2hb_fill_node_map); | |
1345 | ||
1346 | /* | |
1347 | * heartbeat configfs bits. The heartbeat set is a default set under | |
1348 | * the cluster set in nodemanager.c. | |
1349 | */ | |
1350 | ||
1351 | static struct o2hb_region *to_o2hb_region(struct config_item *item) | |
1352 | { | |
1353 | return item ? container_of(item, struct o2hb_region, hr_item) : NULL; | |
1354 | } | |
1355 | ||
1356 | /* drop_item only drops its ref after killing the thread, nothing should | |
1357 | * be using the region anymore. this has to clean up any state that | |
1358 | * attributes might have built up. */ | |
1359 | static void o2hb_region_release(struct config_item *item) | |
1360 | { | |
1361 | int i; | |
1362 | struct page *page; | |
1363 | struct o2hb_region *reg = to_o2hb_region(item); | |
1364 | ||
1365 | if (reg->hr_tmp_block) | |
1366 | kfree(reg->hr_tmp_block); | |
1367 | ||
1368 | if (reg->hr_slot_data) { | |
1369 | for (i = 0; i < reg->hr_num_pages; i++) { | |
1370 | page = reg->hr_slot_data[i]; | |
1371 | if (page) | |
1372 | __free_page(page); | |
1373 | } | |
1374 | kfree(reg->hr_slot_data); | |
1375 | } | |
1376 | ||
1377 | if (reg->hr_bdev) | |
9a1c3542 | 1378 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
1379 | |
1380 | if (reg->hr_slots) | |
1381 | kfree(reg->hr_slots); | |
1382 | ||
1f285305 SM |
1383 | kfree(reg->hr_db_regnum); |
1384 | kfree(reg->hr_db_livenodes); | |
1385 | debugfs_remove(reg->hr_debug_livenodes); | |
1386 | debugfs_remove(reg->hr_debug_regnum); | |
d4396eaf | 1387 | debugfs_remove(reg->hr_debug_elapsed_time); |
1f285305 SM |
1388 | debugfs_remove(reg->hr_debug_dir); |
1389 | ||
a7f6a5fb MF |
1390 | spin_lock(&o2hb_live_lock); |
1391 | list_del(®->hr_all_item); | |
1392 | spin_unlock(&o2hb_live_lock); | |
1393 | ||
1394 | kfree(reg); | |
1395 | } | |
1396 | ||
1397 | static int o2hb_read_block_input(struct o2hb_region *reg, | |
1398 | const char *page, | |
1399 | size_t count, | |
1400 | unsigned long *ret_bytes, | |
1401 | unsigned int *ret_bits) | |
1402 | { | |
1403 | unsigned long bytes; | |
1404 | char *p = (char *)page; | |
1405 | ||
1406 | bytes = simple_strtoul(p, &p, 0); | |
1407 | if (!p || (*p && (*p != '\n'))) | |
1408 | return -EINVAL; | |
1409 | ||
1410 | /* Heartbeat and fs min / max block sizes are the same. */ | |
1411 | if (bytes > 4096 || bytes < 512) | |
1412 | return -ERANGE; | |
1413 | if (hweight16(bytes) != 1) | |
1414 | return -EINVAL; | |
1415 | ||
1416 | if (ret_bytes) | |
1417 | *ret_bytes = bytes; | |
1418 | if (ret_bits) | |
1419 | *ret_bits = ffs(bytes) - 1; | |
1420 | ||
1421 | return 0; | |
1422 | } | |
1423 | ||
1424 | static ssize_t o2hb_region_block_bytes_read(struct o2hb_region *reg, | |
1425 | char *page) | |
1426 | { | |
1427 | return sprintf(page, "%u\n", reg->hr_block_bytes); | |
1428 | } | |
1429 | ||
1430 | static ssize_t o2hb_region_block_bytes_write(struct o2hb_region *reg, | |
1431 | const char *page, | |
1432 | size_t count) | |
1433 | { | |
1434 | int status; | |
1435 | unsigned long block_bytes; | |
1436 | unsigned int block_bits; | |
1437 | ||
1438 | if (reg->hr_bdev) | |
1439 | return -EINVAL; | |
1440 | ||
1441 | status = o2hb_read_block_input(reg, page, count, | |
1442 | &block_bytes, &block_bits); | |
1443 | if (status) | |
1444 | return status; | |
1445 | ||
1446 | reg->hr_block_bytes = (unsigned int)block_bytes; | |
1447 | reg->hr_block_bits = block_bits; | |
1448 | ||
1449 | return count; | |
1450 | } | |
1451 | ||
1452 | static ssize_t o2hb_region_start_block_read(struct o2hb_region *reg, | |
1453 | char *page) | |
1454 | { | |
1455 | return sprintf(page, "%llu\n", reg->hr_start_block); | |
1456 | } | |
1457 | ||
1458 | static ssize_t o2hb_region_start_block_write(struct o2hb_region *reg, | |
1459 | const char *page, | |
1460 | size_t count) | |
1461 | { | |
1462 | unsigned long long tmp; | |
1463 | char *p = (char *)page; | |
1464 | ||
1465 | if (reg->hr_bdev) | |
1466 | return -EINVAL; | |
1467 | ||
1468 | tmp = simple_strtoull(p, &p, 0); | |
1469 | if (!p || (*p && (*p != '\n'))) | |
1470 | return -EINVAL; | |
1471 | ||
1472 | reg->hr_start_block = tmp; | |
1473 | ||
1474 | return count; | |
1475 | } | |
1476 | ||
1477 | static ssize_t o2hb_region_blocks_read(struct o2hb_region *reg, | |
1478 | char *page) | |
1479 | { | |
1480 | return sprintf(page, "%d\n", reg->hr_blocks); | |
1481 | } | |
1482 | ||
1483 | static ssize_t o2hb_region_blocks_write(struct o2hb_region *reg, | |
1484 | const char *page, | |
1485 | size_t count) | |
1486 | { | |
1487 | unsigned long tmp; | |
1488 | char *p = (char *)page; | |
1489 | ||
1490 | if (reg->hr_bdev) | |
1491 | return -EINVAL; | |
1492 | ||
1493 | tmp = simple_strtoul(p, &p, 0); | |
1494 | if (!p || (*p && (*p != '\n'))) | |
1495 | return -EINVAL; | |
1496 | ||
1497 | if (tmp > O2NM_MAX_NODES || tmp == 0) | |
1498 | return -ERANGE; | |
1499 | ||
1500 | reg->hr_blocks = (unsigned int)tmp; | |
1501 | ||
1502 | return count; | |
1503 | } | |
1504 | ||
1505 | static ssize_t o2hb_region_dev_read(struct o2hb_region *reg, | |
1506 | char *page) | |
1507 | { | |
1508 | unsigned int ret = 0; | |
1509 | ||
1510 | if (reg->hr_bdev) | |
1511 | ret = sprintf(page, "%s\n", reg->hr_dev_name); | |
1512 | ||
1513 | return ret; | |
1514 | } | |
1515 | ||
1516 | static void o2hb_init_region_params(struct o2hb_region *reg) | |
1517 | { | |
1518 | reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits; | |
1519 | reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; | |
1520 | ||
1521 | mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", | |
1522 | reg->hr_start_block, reg->hr_blocks); | |
1523 | mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", | |
1524 | reg->hr_block_bytes, reg->hr_block_bits); | |
1525 | mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); | |
1526 | mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); | |
1527 | } | |
1528 | ||
1529 | static int o2hb_map_slot_data(struct o2hb_region *reg) | |
1530 | { | |
1531 | int i, j; | |
1532 | unsigned int last_slot; | |
1533 | unsigned int spp = reg->hr_slots_per_page; | |
1534 | struct page *page; | |
1535 | char *raw; | |
1536 | struct o2hb_disk_slot *slot; | |
1537 | ||
1538 | reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); | |
1539 | if (reg->hr_tmp_block == NULL) { | |
1540 | mlog_errno(-ENOMEM); | |
1541 | return -ENOMEM; | |
1542 | } | |
1543 | ||
1544 | reg->hr_slots = kcalloc(reg->hr_blocks, | |
1545 | sizeof(struct o2hb_disk_slot), GFP_KERNEL); | |
1546 | if (reg->hr_slots == NULL) { | |
1547 | mlog_errno(-ENOMEM); | |
1548 | return -ENOMEM; | |
1549 | } | |
1550 | ||
1551 | for(i = 0; i < reg->hr_blocks; i++) { | |
1552 | slot = ®->hr_slots[i]; | |
1553 | slot->ds_node_num = i; | |
1554 | INIT_LIST_HEAD(&slot->ds_live_item); | |
1555 | slot->ds_raw_block = NULL; | |
1556 | } | |
1557 | ||
1558 | reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; | |
1559 | mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " | |
1560 | "at %u blocks per page\n", | |
1561 | reg->hr_num_pages, reg->hr_blocks, spp); | |
1562 | ||
1563 | reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), | |
1564 | GFP_KERNEL); | |
1565 | if (!reg->hr_slot_data) { | |
1566 | mlog_errno(-ENOMEM); | |
1567 | return -ENOMEM; | |
1568 | } | |
1569 | ||
1570 | for(i = 0; i < reg->hr_num_pages; i++) { | |
1571 | page = alloc_page(GFP_KERNEL); | |
1572 | if (!page) { | |
1573 | mlog_errno(-ENOMEM); | |
1574 | return -ENOMEM; | |
1575 | } | |
1576 | ||
1577 | reg->hr_slot_data[i] = page; | |
1578 | ||
1579 | last_slot = i * spp; | |
1580 | raw = page_address(page); | |
1581 | for (j = 0; | |
1582 | (j < spp) && ((j + last_slot) < reg->hr_blocks); | |
1583 | j++) { | |
1584 | BUG_ON((j + last_slot) >= reg->hr_blocks); | |
1585 | ||
1586 | slot = ®->hr_slots[j + last_slot]; | |
1587 | slot->ds_raw_block = | |
1588 | (struct o2hb_disk_heartbeat_block *) raw; | |
1589 | ||
1590 | raw += reg->hr_block_bytes; | |
1591 | } | |
1592 | } | |
1593 | ||
1594 | return 0; | |
1595 | } | |
1596 | ||
1597 | /* Read in all the slots available and populate the tracking | |
1598 | * structures so that we can start with a baseline idea of what's | |
1599 | * there. */ | |
1600 | static int o2hb_populate_slot_data(struct o2hb_region *reg) | |
1601 | { | |
1602 | int ret, i; | |
1603 | struct o2hb_disk_slot *slot; | |
1604 | struct o2hb_disk_heartbeat_block *hb_block; | |
1605 | ||
1606 | mlog_entry_void(); | |
1607 | ||
1608 | ret = o2hb_read_slots(reg, reg->hr_blocks); | |
1609 | if (ret) { | |
1610 | mlog_errno(ret); | |
1611 | goto out; | |
1612 | } | |
1613 | ||
1614 | /* We only want to get an idea of the values initially in each | |
1615 | * slot, so we do no verification - o2hb_check_slot will | |
1616 | * actually determine if each configured slot is valid and | |
1617 | * whether any values have changed. */ | |
1618 | for(i = 0; i < reg->hr_blocks; i++) { | |
1619 | slot = ®->hr_slots[i]; | |
1620 | hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; | |
1621 | ||
1622 | /* Only fill the values that o2hb_check_slot uses to | |
1623 | * determine changing slots */ | |
1624 | slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); | |
1625 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
1626 | } | |
1627 | ||
1628 | out: | |
1629 | mlog_exit(ret); | |
1630 | return ret; | |
1631 | } | |
1632 | ||
1633 | /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */ | |
1634 | static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, | |
1635 | const char *page, | |
1636 | size_t count) | |
1637 | { | |
e6c352db | 1638 | struct task_struct *hb_task; |
a7f6a5fb MF |
1639 | long fd; |
1640 | int sectsize; | |
1641 | char *p = (char *)page; | |
1642 | struct file *filp = NULL; | |
1643 | struct inode *inode = NULL; | |
1644 | ssize_t ret = -EINVAL; | |
1645 | ||
1646 | if (reg->hr_bdev) | |
1647 | goto out; | |
1648 | ||
1649 | /* We can't heartbeat without having had our node number | |
1650 | * configured yet. */ | |
1651 | if (o2nm_this_node() == O2NM_MAX_NODES) | |
1652 | goto out; | |
1653 | ||
1654 | fd = simple_strtol(p, &p, 0); | |
1655 | if (!p || (*p && (*p != '\n'))) | |
1656 | goto out; | |
1657 | ||
1658 | if (fd < 0 || fd >= INT_MAX) | |
1659 | goto out; | |
1660 | ||
1661 | filp = fget(fd); | |
1662 | if (filp == NULL) | |
1663 | goto out; | |
1664 | ||
1665 | if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || | |
1666 | reg->hr_block_bytes == 0) | |
1667 | goto out; | |
1668 | ||
1669 | inode = igrab(filp->f_mapping->host); | |
1670 | if (inode == NULL) | |
1671 | goto out; | |
1672 | ||
1673 | if (!S_ISBLK(inode->i_mode)) | |
1674 | goto out; | |
1675 | ||
1676 | reg->hr_bdev = I_BDEV(filp->f_mapping->host); | |
572c4892 | 1677 | ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ); |
a7f6a5fb MF |
1678 | if (ret) { |
1679 | reg->hr_bdev = NULL; | |
1680 | goto out; | |
1681 | } | |
1682 | inode = NULL; | |
1683 | ||
1684 | bdevname(reg->hr_bdev, reg->hr_dev_name); | |
1685 | ||
e1defc4f | 1686 | sectsize = bdev_logical_block_size(reg->hr_bdev); |
a7f6a5fb MF |
1687 | if (sectsize != reg->hr_block_bytes) { |
1688 | mlog(ML_ERROR, | |
1689 | "blocksize %u incorrect for device, expected %d", | |
1690 | reg->hr_block_bytes, sectsize); | |
1691 | ret = -EINVAL; | |
1692 | goto out; | |
1693 | } | |
1694 | ||
1695 | o2hb_init_region_params(reg); | |
1696 | ||
1697 | /* Generation of zero is invalid */ | |
1698 | do { | |
1699 | get_random_bytes(®->hr_generation, | |
1700 | sizeof(reg->hr_generation)); | |
1701 | } while (reg->hr_generation == 0); | |
1702 | ||
1703 | ret = o2hb_map_slot_data(reg); | |
1704 | if (ret) { | |
1705 | mlog_errno(ret); | |
1706 | goto out; | |
1707 | } | |
1708 | ||
1709 | ret = o2hb_populate_slot_data(reg); | |
1710 | if (ret) { | |
1711 | mlog_errno(ret); | |
1712 | goto out; | |
1713 | } | |
1714 | ||
c4028958 | 1715 | INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout); |
a7f6a5fb MF |
1716 | |
1717 | /* | |
1718 | * A node is considered live after it has beat LIVE_THRESHOLD | |
1719 | * times. We're not steady until we've given them a chance | |
1720 | * _after_ our first read. | |
1721 | */ | |
1722 | atomic_set(®->hr_steady_iterations, O2HB_LIVE_THRESHOLD + 1); | |
1723 | ||
e6c352db JB |
1724 | hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s", |
1725 | reg->hr_item.ci_name); | |
1726 | if (IS_ERR(hb_task)) { | |
1727 | ret = PTR_ERR(hb_task); | |
a7f6a5fb | 1728 | mlog_errno(ret); |
a7f6a5fb MF |
1729 | goto out; |
1730 | } | |
1731 | ||
e6c352db JB |
1732 | spin_lock(&o2hb_live_lock); |
1733 | reg->hr_task = hb_task; | |
1734 | spin_unlock(&o2hb_live_lock); | |
1735 | ||
a7f6a5fb MF |
1736 | ret = wait_event_interruptible(o2hb_steady_queue, |
1737 | atomic_read(®->hr_steady_iterations) == 0); | |
1738 | if (ret) { | |
e6df3a66 | 1739 | /* We got interrupted (hello ptrace!). Clean up */ |
e6c352db JB |
1740 | spin_lock(&o2hb_live_lock); |
1741 | hb_task = reg->hr_task; | |
a7f6a5fb | 1742 | reg->hr_task = NULL; |
e6c352db JB |
1743 | spin_unlock(&o2hb_live_lock); |
1744 | ||
1745 | if (hb_task) | |
1746 | kthread_stop(hb_task); | |
a7f6a5fb MF |
1747 | goto out; |
1748 | } | |
1749 | ||
e6df3a66 JB |
1750 | /* Ok, we were woken. Make sure it wasn't by drop_item() */ |
1751 | spin_lock(&o2hb_live_lock); | |
1752 | hb_task = reg->hr_task; | |
e7d656ba SM |
1753 | if (o2hb_global_heartbeat_active()) |
1754 | set_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
e6df3a66 JB |
1755 | spin_unlock(&o2hb_live_lock); |
1756 | ||
1757 | if (hb_task) | |
1758 | ret = count; | |
1759 | else | |
1760 | ret = -EIO; | |
1761 | ||
18c50cb0 SM |
1762 | if (hb_task && o2hb_global_heartbeat_active()) |
1763 | printk(KERN_NOTICE "o2hb: Heartbeat started on region %s\n", | |
1764 | config_item_name(®->hr_item)); | |
1765 | ||
a7f6a5fb MF |
1766 | out: |
1767 | if (filp) | |
1768 | fput(filp); | |
1769 | if (inode) | |
1770 | iput(inode); | |
1771 | if (ret < 0) { | |
1772 | if (reg->hr_bdev) { | |
9a1c3542 | 1773 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
1774 | reg->hr_bdev = NULL; |
1775 | } | |
1776 | } | |
1777 | return ret; | |
1778 | } | |
1779 | ||
92efc152 ZW |
1780 | static ssize_t o2hb_region_pid_read(struct o2hb_region *reg, |
1781 | char *page) | |
1782 | { | |
e6c352db JB |
1783 | pid_t pid = 0; |
1784 | ||
1785 | spin_lock(&o2hb_live_lock); | |
1786 | if (reg->hr_task) | |
ba25f9dc | 1787 | pid = task_pid_nr(reg->hr_task); |
e6c352db JB |
1788 | spin_unlock(&o2hb_live_lock); |
1789 | ||
1790 | if (!pid) | |
92efc152 ZW |
1791 | return 0; |
1792 | ||
e6c352db | 1793 | return sprintf(page, "%u\n", pid); |
92efc152 ZW |
1794 | } |
1795 | ||
a7f6a5fb MF |
1796 | struct o2hb_region_attribute { |
1797 | struct configfs_attribute attr; | |
1798 | ssize_t (*show)(struct o2hb_region *, char *); | |
1799 | ssize_t (*store)(struct o2hb_region *, const char *, size_t); | |
1800 | }; | |
1801 | ||
1802 | static struct o2hb_region_attribute o2hb_region_attr_block_bytes = { | |
1803 | .attr = { .ca_owner = THIS_MODULE, | |
1804 | .ca_name = "block_bytes", | |
1805 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1806 | .show = o2hb_region_block_bytes_read, | |
1807 | .store = o2hb_region_block_bytes_write, | |
1808 | }; | |
1809 | ||
1810 | static struct o2hb_region_attribute o2hb_region_attr_start_block = { | |
1811 | .attr = { .ca_owner = THIS_MODULE, | |
1812 | .ca_name = "start_block", | |
1813 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1814 | .show = o2hb_region_start_block_read, | |
1815 | .store = o2hb_region_start_block_write, | |
1816 | }; | |
1817 | ||
1818 | static struct o2hb_region_attribute o2hb_region_attr_blocks = { | |
1819 | .attr = { .ca_owner = THIS_MODULE, | |
1820 | .ca_name = "blocks", | |
1821 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1822 | .show = o2hb_region_blocks_read, | |
1823 | .store = o2hb_region_blocks_write, | |
1824 | }; | |
1825 | ||
1826 | static struct o2hb_region_attribute o2hb_region_attr_dev = { | |
1827 | .attr = { .ca_owner = THIS_MODULE, | |
1828 | .ca_name = "dev", | |
1829 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1830 | .show = o2hb_region_dev_read, | |
1831 | .store = o2hb_region_dev_write, | |
1832 | }; | |
1833 | ||
92efc152 ZW |
1834 | static struct o2hb_region_attribute o2hb_region_attr_pid = { |
1835 | .attr = { .ca_owner = THIS_MODULE, | |
1836 | .ca_name = "pid", | |
1837 | .ca_mode = S_IRUGO | S_IRUSR }, | |
1838 | .show = o2hb_region_pid_read, | |
1839 | }; | |
1840 | ||
a7f6a5fb MF |
1841 | static struct configfs_attribute *o2hb_region_attrs[] = { |
1842 | &o2hb_region_attr_block_bytes.attr, | |
1843 | &o2hb_region_attr_start_block.attr, | |
1844 | &o2hb_region_attr_blocks.attr, | |
1845 | &o2hb_region_attr_dev.attr, | |
92efc152 | 1846 | &o2hb_region_attr_pid.attr, |
a7f6a5fb MF |
1847 | NULL, |
1848 | }; | |
1849 | ||
1850 | static ssize_t o2hb_region_show(struct config_item *item, | |
1851 | struct configfs_attribute *attr, | |
1852 | char *page) | |
1853 | { | |
1854 | struct o2hb_region *reg = to_o2hb_region(item); | |
1855 | struct o2hb_region_attribute *o2hb_region_attr = | |
1856 | container_of(attr, struct o2hb_region_attribute, attr); | |
1857 | ssize_t ret = 0; | |
1858 | ||
1859 | if (o2hb_region_attr->show) | |
1860 | ret = o2hb_region_attr->show(reg, page); | |
1861 | return ret; | |
1862 | } | |
1863 | ||
1864 | static ssize_t o2hb_region_store(struct config_item *item, | |
1865 | struct configfs_attribute *attr, | |
1866 | const char *page, size_t count) | |
1867 | { | |
1868 | struct o2hb_region *reg = to_o2hb_region(item); | |
1869 | struct o2hb_region_attribute *o2hb_region_attr = | |
1870 | container_of(attr, struct o2hb_region_attribute, attr); | |
1871 | ssize_t ret = -EINVAL; | |
1872 | ||
1873 | if (o2hb_region_attr->store) | |
1874 | ret = o2hb_region_attr->store(reg, page, count); | |
1875 | return ret; | |
1876 | } | |
1877 | ||
1878 | static struct configfs_item_operations o2hb_region_item_ops = { | |
1879 | .release = o2hb_region_release, | |
1880 | .show_attribute = o2hb_region_show, | |
1881 | .store_attribute = o2hb_region_store, | |
1882 | }; | |
1883 | ||
1884 | static struct config_item_type o2hb_region_type = { | |
1885 | .ct_item_ops = &o2hb_region_item_ops, | |
1886 | .ct_attrs = o2hb_region_attrs, | |
1887 | .ct_owner = THIS_MODULE, | |
1888 | }; | |
1889 | ||
1890 | /* heartbeat set */ | |
1891 | ||
1892 | struct o2hb_heartbeat_group { | |
1893 | struct config_group hs_group; | |
1894 | /* some stuff? */ | |
1895 | }; | |
1896 | ||
1897 | static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) | |
1898 | { | |
1899 | return group ? | |
1900 | container_of(group, struct o2hb_heartbeat_group, hs_group) | |
1901 | : NULL; | |
1902 | } | |
1903 | ||
1f285305 SM |
1904 | static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir) |
1905 | { | |
1906 | int ret = -ENOMEM; | |
1907 | ||
1908 | reg->hr_debug_dir = | |
1909 | debugfs_create_dir(config_item_name(®->hr_item), dir); | |
1910 | if (!reg->hr_debug_dir) { | |
1911 | mlog_errno(ret); | |
1912 | goto bail; | |
1913 | } | |
1914 | ||
1915 | reg->hr_debug_livenodes = | |
1916 | o2hb_debug_create(O2HB_DEBUG_LIVENODES, | |
1917 | reg->hr_debug_dir, | |
1918 | &(reg->hr_db_livenodes), | |
1919 | sizeof(*(reg->hr_db_livenodes)), | |
1920 | O2HB_DB_TYPE_REGION_LIVENODES, | |
1921 | sizeof(reg->hr_live_node_bitmap), | |
1922 | O2NM_MAX_NODES, reg); | |
1923 | if (!reg->hr_debug_livenodes) { | |
1924 | mlog_errno(ret); | |
1925 | goto bail; | |
1926 | } | |
1927 | ||
1928 | reg->hr_debug_regnum = | |
1929 | o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER, | |
1930 | reg->hr_debug_dir, | |
1931 | &(reg->hr_db_regnum), | |
1932 | sizeof(*(reg->hr_db_regnum)), | |
1933 | O2HB_DB_TYPE_REGION_NUMBER, | |
1934 | 0, O2NM_MAX_NODES, reg); | |
1935 | if (!reg->hr_debug_regnum) { | |
1936 | mlog_errno(ret); | |
1937 | goto bail; | |
1938 | } | |
1939 | ||
43695d09 SM |
1940 | reg->hr_debug_elapsed_time = |
1941 | o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME, | |
1942 | reg->hr_debug_dir, | |
1943 | &(reg->hr_db_elapsed_time), | |
1944 | sizeof(*(reg->hr_db_elapsed_time)), | |
1945 | O2HB_DB_TYPE_REGION_ELAPSED_TIME, | |
1946 | 0, 0, reg); | |
1947 | if (!reg->hr_debug_elapsed_time) { | |
1948 | mlog_errno(ret); | |
1949 | goto bail; | |
1950 | } | |
1951 | ||
1f285305 SM |
1952 | ret = 0; |
1953 | bail: | |
1954 | return ret; | |
1955 | } | |
1956 | ||
f89ab861 JB |
1957 | static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, |
1958 | const char *name) | |
a7f6a5fb MF |
1959 | { |
1960 | struct o2hb_region *reg = NULL; | |
1f285305 | 1961 | int ret; |
a7f6a5fb | 1962 | |
cd861280 | 1963 | reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL); |
f89ab861 | 1964 | if (reg == NULL) |
a6795e9e | 1965 | return ERR_PTR(-ENOMEM); |
a7f6a5fb | 1966 | |
b3c85c4c SM |
1967 | if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) |
1968 | return ERR_PTR(-ENAMETOOLONG); | |
1969 | ||
a7f6a5fb | 1970 | spin_lock(&o2hb_live_lock); |
536f0741 SM |
1971 | reg->hr_region_num = 0; |
1972 | if (o2hb_global_heartbeat_active()) { | |
1973 | reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap, | |
1974 | O2NM_MAX_REGIONS); | |
1975 | if (reg->hr_region_num >= O2NM_MAX_REGIONS) { | |
1976 | spin_unlock(&o2hb_live_lock); | |
1977 | return ERR_PTR(-EFBIG); | |
1978 | } | |
1979 | set_bit(reg->hr_region_num, o2hb_region_bitmap); | |
1980 | } | |
a7f6a5fb MF |
1981 | list_add_tail(®->hr_all_item, &o2hb_all_regions); |
1982 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb | 1983 | |
536f0741 SM |
1984 | config_item_init_type_name(®->hr_item, name, &o2hb_region_type); |
1985 | ||
1f285305 SM |
1986 | ret = o2hb_debug_region_init(reg, o2hb_debug_dir); |
1987 | if (ret) { | |
1988 | config_item_put(®->hr_item); | |
1989 | return ERR_PTR(ret); | |
1990 | } | |
1991 | ||
a6795e9e | 1992 | return ®->hr_item; |
a7f6a5fb MF |
1993 | } |
1994 | ||
1995 | static void o2hb_heartbeat_group_drop_item(struct config_group *group, | |
1996 | struct config_item *item) | |
1997 | { | |
e6c352db | 1998 | struct task_struct *hb_task; |
a7f6a5fb MF |
1999 | struct o2hb_region *reg = to_o2hb_region(item); |
2000 | ||
2001 | /* stop the thread when the user removes the region dir */ | |
e6c352db | 2002 | spin_lock(&o2hb_live_lock); |
e7d656ba | 2003 | if (o2hb_global_heartbeat_active()) { |
536f0741 | 2004 | clear_bit(reg->hr_region_num, o2hb_region_bitmap); |
e7d656ba SM |
2005 | clear_bit(reg->hr_region_num, o2hb_live_region_bitmap); |
2006 | } | |
e6c352db JB |
2007 | hb_task = reg->hr_task; |
2008 | reg->hr_task = NULL; | |
2009 | spin_unlock(&o2hb_live_lock); | |
2010 | ||
2011 | if (hb_task) | |
2012 | kthread_stop(hb_task); | |
a7f6a5fb | 2013 | |
e6df3a66 JB |
2014 | /* |
2015 | * If we're racing a dev_write(), we need to wake them. They will | |
2016 | * check reg->hr_task | |
2017 | */ | |
2018 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
2019 | atomic_set(®->hr_steady_iterations, 0); | |
2020 | wake_up(&o2hb_steady_queue); | |
2021 | } | |
2022 | ||
18c50cb0 SM |
2023 | if (o2hb_global_heartbeat_active()) |
2024 | printk(KERN_NOTICE "o2hb: Heartbeat stopped on region %s\n", | |
2025 | config_item_name(®->hr_item)); | |
a7f6a5fb MF |
2026 | config_item_put(item); |
2027 | } | |
2028 | ||
2029 | struct o2hb_heartbeat_group_attribute { | |
2030 | struct configfs_attribute attr; | |
2031 | ssize_t (*show)(struct o2hb_heartbeat_group *, char *); | |
2032 | ssize_t (*store)(struct o2hb_heartbeat_group *, const char *, size_t); | |
2033 | }; | |
2034 | ||
2035 | static ssize_t o2hb_heartbeat_group_show(struct config_item *item, | |
2036 | struct configfs_attribute *attr, | |
2037 | char *page) | |
2038 | { | |
2039 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
2040 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
2041 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
2042 | ssize_t ret = 0; | |
2043 | ||
2044 | if (o2hb_heartbeat_group_attr->show) | |
2045 | ret = o2hb_heartbeat_group_attr->show(reg, page); | |
2046 | return ret; | |
2047 | } | |
2048 | ||
2049 | static ssize_t o2hb_heartbeat_group_store(struct config_item *item, | |
2050 | struct configfs_attribute *attr, | |
2051 | const char *page, size_t count) | |
2052 | { | |
2053 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
2054 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
2055 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
2056 | ssize_t ret = -EINVAL; | |
2057 | ||
2058 | if (o2hb_heartbeat_group_attr->store) | |
2059 | ret = o2hb_heartbeat_group_attr->store(reg, page, count); | |
2060 | return ret; | |
2061 | } | |
2062 | ||
2063 | static ssize_t o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group *group, | |
2064 | char *page) | |
2065 | { | |
2066 | return sprintf(page, "%u\n", o2hb_dead_threshold); | |
2067 | } | |
2068 | ||
2069 | static ssize_t o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group *group, | |
2070 | const char *page, | |
2071 | size_t count) | |
2072 | { | |
2073 | unsigned long tmp; | |
2074 | char *p = (char *)page; | |
2075 | ||
2076 | tmp = simple_strtoul(p, &p, 10); | |
2077 | if (!p || (*p && (*p != '\n'))) | |
2078 | return -EINVAL; | |
2079 | ||
2080 | /* this will validate ranges for us. */ | |
2081 | o2hb_dead_threshold_set((unsigned int) tmp); | |
2082 | ||
2083 | return count; | |
2084 | } | |
2085 | ||
54b5187b SM |
2086 | static |
2087 | ssize_t o2hb_heartbeat_group_mode_show(struct o2hb_heartbeat_group *group, | |
2088 | char *page) | |
2089 | { | |
2090 | return sprintf(page, "%s\n", | |
2091 | o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]); | |
2092 | } | |
2093 | ||
2094 | static | |
2095 | ssize_t o2hb_heartbeat_group_mode_store(struct o2hb_heartbeat_group *group, | |
2096 | const char *page, size_t count) | |
2097 | { | |
2098 | unsigned int i; | |
2099 | int ret; | |
2100 | size_t len; | |
2101 | ||
2102 | len = (page[count - 1] == '\n') ? count - 1 : count; | |
2103 | if (!len) | |
2104 | return -EINVAL; | |
2105 | ||
2106 | for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) { | |
2107 | if (strnicmp(page, o2hb_heartbeat_mode_desc[i], len)) | |
2108 | continue; | |
2109 | ||
2110 | ret = o2hb_global_hearbeat_mode_set(i); | |
2111 | if (!ret) | |
18c50cb0 | 2112 | printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n", |
54b5187b SM |
2113 | o2hb_heartbeat_mode_desc[i]); |
2114 | return count; | |
2115 | } | |
2116 | ||
2117 | return -EINVAL; | |
2118 | ||
2119 | } | |
2120 | ||
a7f6a5fb MF |
2121 | static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold = { |
2122 | .attr = { .ca_owner = THIS_MODULE, | |
2123 | .ca_name = "dead_threshold", | |
2124 | .ca_mode = S_IRUGO | S_IWUSR }, | |
2125 | .show = o2hb_heartbeat_group_threshold_show, | |
2126 | .store = o2hb_heartbeat_group_threshold_store, | |
2127 | }; | |
2128 | ||
54b5187b SM |
2129 | static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_mode = { |
2130 | .attr = { .ca_owner = THIS_MODULE, | |
2131 | .ca_name = "mode", | |
2132 | .ca_mode = S_IRUGO | S_IWUSR }, | |
2133 | .show = o2hb_heartbeat_group_mode_show, | |
2134 | .store = o2hb_heartbeat_group_mode_store, | |
2135 | }; | |
2136 | ||
a7f6a5fb MF |
2137 | static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { |
2138 | &o2hb_heartbeat_group_attr_threshold.attr, | |
54b5187b | 2139 | &o2hb_heartbeat_group_attr_mode.attr, |
a7f6a5fb MF |
2140 | NULL, |
2141 | }; | |
2142 | ||
2143 | static struct configfs_item_operations o2hb_hearbeat_group_item_ops = { | |
2144 | .show_attribute = o2hb_heartbeat_group_show, | |
2145 | .store_attribute = o2hb_heartbeat_group_store, | |
2146 | }; | |
2147 | ||
2148 | static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { | |
2149 | .make_item = o2hb_heartbeat_group_make_item, | |
2150 | .drop_item = o2hb_heartbeat_group_drop_item, | |
2151 | }; | |
2152 | ||
2153 | static struct config_item_type o2hb_heartbeat_group_type = { | |
2154 | .ct_group_ops = &o2hb_heartbeat_group_group_ops, | |
2155 | .ct_item_ops = &o2hb_hearbeat_group_item_ops, | |
2156 | .ct_attrs = o2hb_heartbeat_group_attrs, | |
2157 | .ct_owner = THIS_MODULE, | |
2158 | }; | |
2159 | ||
2160 | /* this is just here to avoid touching group in heartbeat.h which the | |
2161 | * entire damn world #includes */ | |
2162 | struct config_group *o2hb_alloc_hb_set(void) | |
2163 | { | |
2164 | struct o2hb_heartbeat_group *hs = NULL; | |
2165 | struct config_group *ret = NULL; | |
2166 | ||
cd861280 | 2167 | hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); |
a7f6a5fb MF |
2168 | if (hs == NULL) |
2169 | goto out; | |
2170 | ||
2171 | config_group_init_type_name(&hs->hs_group, "heartbeat", | |
2172 | &o2hb_heartbeat_group_type); | |
2173 | ||
2174 | ret = &hs->hs_group; | |
2175 | out: | |
2176 | if (ret == NULL) | |
2177 | kfree(hs); | |
2178 | return ret; | |
2179 | } | |
2180 | ||
2181 | void o2hb_free_hb_set(struct config_group *group) | |
2182 | { | |
2183 | struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); | |
2184 | kfree(hs); | |
2185 | } | |
2186 | ||
2187 | /* hb callback registration and issueing */ | |
2188 | ||
2189 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) | |
2190 | { | |
2191 | if (type == O2HB_NUM_CB) | |
2192 | return ERR_PTR(-EINVAL); | |
2193 | ||
2194 | return &o2hb_callbacks[type]; | |
2195 | } | |
2196 | ||
2197 | void o2hb_setup_callback(struct o2hb_callback_func *hc, | |
2198 | enum o2hb_callback_type type, | |
2199 | o2hb_cb_func *func, | |
2200 | void *data, | |
2201 | int priority) | |
2202 | { | |
2203 | INIT_LIST_HEAD(&hc->hc_item); | |
2204 | hc->hc_func = func; | |
2205 | hc->hc_data = data; | |
2206 | hc->hc_priority = priority; | |
2207 | hc->hc_type = type; | |
2208 | hc->hc_magic = O2HB_CB_MAGIC; | |
2209 | } | |
2210 | EXPORT_SYMBOL_GPL(o2hb_setup_callback); | |
2211 | ||
14829422 JB |
2212 | static struct o2hb_region *o2hb_find_region(const char *region_uuid) |
2213 | { | |
2214 | struct o2hb_region *p, *reg = NULL; | |
2215 | ||
2216 | assert_spin_locked(&o2hb_live_lock); | |
2217 | ||
2218 | list_for_each_entry(p, &o2hb_all_regions, hr_all_item) { | |
2219 | if (!strcmp(region_uuid, config_item_name(&p->hr_item))) { | |
2220 | reg = p; | |
2221 | break; | |
2222 | } | |
2223 | } | |
2224 | ||
2225 | return reg; | |
2226 | } | |
2227 | ||
2228 | static int o2hb_region_get(const char *region_uuid) | |
2229 | { | |
2230 | int ret = 0; | |
2231 | struct o2hb_region *reg; | |
2232 | ||
2233 | spin_lock(&o2hb_live_lock); | |
2234 | ||
2235 | reg = o2hb_find_region(region_uuid); | |
2236 | if (!reg) | |
2237 | ret = -ENOENT; | |
2238 | spin_unlock(&o2hb_live_lock); | |
2239 | ||
16c6a4f2 JB |
2240 | if (ret) |
2241 | goto out; | |
2242 | ||
2243 | ret = o2nm_depend_this_node(); | |
2244 | if (ret) | |
2245 | goto out; | |
14829422 | 2246 | |
16c6a4f2 JB |
2247 | ret = o2nm_depend_item(®->hr_item); |
2248 | if (ret) | |
2249 | o2nm_undepend_this_node(); | |
2250 | ||
2251 | out: | |
14829422 JB |
2252 | return ret; |
2253 | } | |
2254 | ||
2255 | static void o2hb_region_put(const char *region_uuid) | |
2256 | { | |
2257 | struct o2hb_region *reg; | |
2258 | ||
2259 | spin_lock(&o2hb_live_lock); | |
2260 | ||
2261 | reg = o2hb_find_region(region_uuid); | |
2262 | ||
2263 | spin_unlock(&o2hb_live_lock); | |
2264 | ||
16c6a4f2 | 2265 | if (reg) { |
14829422 | 2266 | o2nm_undepend_item(®->hr_item); |
16c6a4f2 JB |
2267 | o2nm_undepend_this_node(); |
2268 | } | |
14829422 JB |
2269 | } |
2270 | ||
2271 | int o2hb_register_callback(const char *region_uuid, | |
2272 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
2273 | { |
2274 | struct o2hb_callback_func *tmp; | |
2275 | struct list_head *iter; | |
2276 | struct o2hb_callback *hbcall; | |
2277 | int ret; | |
2278 | ||
2279 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2280 | BUG_ON(!list_empty(&hc->hc_item)); | |
2281 | ||
2282 | hbcall = hbcall_from_type(hc->hc_type); | |
2283 | if (IS_ERR(hbcall)) { | |
2284 | ret = PTR_ERR(hbcall); | |
2285 | goto out; | |
2286 | } | |
2287 | ||
14829422 JB |
2288 | if (region_uuid) { |
2289 | ret = o2hb_region_get(region_uuid); | |
2290 | if (ret) | |
2291 | goto out; | |
2292 | } | |
2293 | ||
a7f6a5fb MF |
2294 | down_write(&o2hb_callback_sem); |
2295 | ||
2296 | list_for_each(iter, &hbcall->list) { | |
2297 | tmp = list_entry(iter, struct o2hb_callback_func, hc_item); | |
2298 | if (hc->hc_priority < tmp->hc_priority) { | |
2299 | list_add_tail(&hc->hc_item, iter); | |
2300 | break; | |
2301 | } | |
2302 | } | |
2303 | if (list_empty(&hc->hc_item)) | |
2304 | list_add_tail(&hc->hc_item, &hbcall->list); | |
2305 | ||
2306 | up_write(&o2hb_callback_sem); | |
2307 | ret = 0; | |
2308 | out: | |
2309 | mlog(ML_HEARTBEAT, "returning %d on behalf of %p for funcs %p\n", | |
2310 | ret, __builtin_return_address(0), hc); | |
2311 | return ret; | |
2312 | } | |
2313 | EXPORT_SYMBOL_GPL(o2hb_register_callback); | |
2314 | ||
14829422 JB |
2315 | void o2hb_unregister_callback(const char *region_uuid, |
2316 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
2317 | { |
2318 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2319 | ||
2320 | mlog(ML_HEARTBEAT, "on behalf of %p for funcs %p\n", | |
2321 | __builtin_return_address(0), hc); | |
2322 | ||
14829422 | 2323 | /* XXX Can this happen _with_ a region reference? */ |
a7f6a5fb | 2324 | if (list_empty(&hc->hc_item)) |
c24f72cc | 2325 | return; |
a7f6a5fb | 2326 | |
14829422 JB |
2327 | if (region_uuid) |
2328 | o2hb_region_put(region_uuid); | |
2329 | ||
a7f6a5fb MF |
2330 | down_write(&o2hb_callback_sem); |
2331 | ||
2332 | list_del_init(&hc->hc_item); | |
2333 | ||
2334 | up_write(&o2hb_callback_sem); | |
a7f6a5fb MF |
2335 | } |
2336 | EXPORT_SYMBOL_GPL(o2hb_unregister_callback); | |
2337 | ||
2338 | int o2hb_check_node_heartbeating(u8 node_num) | |
2339 | { | |
2340 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2341 | ||
2342 | o2hb_fill_node_map(testing_map, sizeof(testing_map)); | |
2343 | if (!test_bit(node_num, testing_map)) { | |
2344 | mlog(ML_HEARTBEAT, | |
2345 | "node (%u) does not have heartbeating enabled.\n", | |
2346 | node_num); | |
2347 | return 0; | |
2348 | } | |
2349 | ||
2350 | return 1; | |
2351 | } | |
2352 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating); | |
2353 | ||
2354 | int o2hb_check_node_heartbeating_from_callback(u8 node_num) | |
2355 | { | |
2356 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2357 | ||
2358 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); | |
2359 | if (!test_bit(node_num, testing_map)) { | |
2360 | mlog(ML_HEARTBEAT, | |
2361 | "node (%u) does not have heartbeating enabled.\n", | |
2362 | node_num); | |
2363 | return 0; | |
2364 | } | |
2365 | ||
2366 | return 1; | |
2367 | } | |
2368 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); | |
2369 | ||
2370 | /* Makes sure our local node is configured with a node number, and is | |
2371 | * heartbeating. */ | |
2372 | int o2hb_check_local_node_heartbeating(void) | |
2373 | { | |
2374 | u8 node_num; | |
2375 | ||
2376 | /* if this node was set then we have networking */ | |
2377 | node_num = o2nm_this_node(); | |
2378 | if (node_num == O2NM_MAX_NODES) { | |
2379 | mlog(ML_HEARTBEAT, "this node has not been configured.\n"); | |
2380 | return 0; | |
2381 | } | |
2382 | ||
2383 | return o2hb_check_node_heartbeating(node_num); | |
2384 | } | |
2385 | EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating); | |
2386 | ||
2387 | /* | |
2388 | * this is just a hack until we get the plumbing which flips file systems | |
2389 | * read only and drops the hb ref instead of killing the node dead. | |
2390 | */ | |
2391 | void o2hb_stop_all_regions(void) | |
2392 | { | |
2393 | struct o2hb_region *reg; | |
2394 | ||
2395 | mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); | |
2396 | ||
2397 | spin_lock(&o2hb_live_lock); | |
2398 | ||
2399 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) | |
2400 | reg->hr_unclean_stop = 1; | |
2401 | ||
2402 | spin_unlock(&o2hb_live_lock); | |
2403 | } | |
2404 | EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); | |
b3c85c4c SM |
2405 | |
2406 | int o2hb_get_all_regions(char *region_uuids, u8 max_regions) | |
2407 | { | |
2408 | struct o2hb_region *reg; | |
2409 | int numregs = 0; | |
2410 | char *p; | |
2411 | ||
2412 | spin_lock(&o2hb_live_lock); | |
2413 | ||
2414 | p = region_uuids; | |
2415 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { | |
2416 | mlog(0, "Region: %s\n", config_item_name(®->hr_item)); | |
2417 | if (numregs < max_regions) { | |
2418 | memcpy(p, config_item_name(®->hr_item), | |
2419 | O2HB_MAX_REGION_NAME_LEN); | |
2420 | p += O2HB_MAX_REGION_NAME_LEN; | |
2421 | } | |
2422 | numregs++; | |
2423 | } | |
2424 | ||
2425 | spin_unlock(&o2hb_live_lock); | |
2426 | ||
2427 | return numregs; | |
2428 | } | |
2429 | EXPORT_SYMBOL_GPL(o2hb_get_all_regions); | |
2430 | ||
2431 | int o2hb_global_heartbeat_active(void) | |
2432 | { | |
4d94aa1b | 2433 | return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL); |
b3c85c4c SM |
2434 | } |
2435 | EXPORT_SYMBOL(o2hb_global_heartbeat_active); |