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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> |
a8f70de3 | 38 | #include <linux/bitmap.h> |
a7f6a5fb MF |
39 | |
40 | #include "heartbeat.h" | |
41 | #include "tcp.h" | |
42 | #include "nodemanager.h" | |
43 | #include "quorum.h" | |
44 | ||
45 | #include "masklog.h" | |
46 | ||
47 | ||
48 | /* | |
49 | * The first heartbeat pass had one global thread that would serialize all hb | |
50 | * callback calls. This global serializing sem should only be removed once | |
51 | * we've made sure that all callees can deal with being called concurrently | |
52 | * from multiple hb region threads. | |
53 | */ | |
54 | static DECLARE_RWSEM(o2hb_callback_sem); | |
55 | ||
56 | /* | |
57 | * multiple hb threads are watching multiple regions. A node is live | |
58 | * whenever any of the threads sees activity from the node in its region. | |
59 | */ | |
34af946a | 60 | static DEFINE_SPINLOCK(o2hb_live_lock); |
a7f6a5fb MF |
61 | static struct list_head o2hb_live_slots[O2NM_MAX_NODES]; |
62 | static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
63 | static LIST_HEAD(o2hb_node_events); | |
64 | static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue); | |
65 | ||
536f0741 SM |
66 | /* |
67 | * In global heartbeat, we maintain a series of region bitmaps. | |
68 | * - o2hb_region_bitmap allows us to limit the region number to max region. | |
e7d656ba | 69 | * - o2hb_live_region_bitmap tracks live regions (seen steady iterations). |
43182d2a SM |
70 | * - o2hb_quorum_region_bitmap tracks live regions that have seen all nodes |
71 | * heartbeat on it. | |
b1c5ebfb | 72 | * - o2hb_failed_region_bitmap tracks the regions that have seen io timeouts. |
536f0741 SM |
73 | */ |
74 | static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; | |
e7d656ba | 75 | static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
43182d2a | 76 | static unsigned long o2hb_quorum_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
b1c5ebfb | 77 | static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
536f0741 | 78 | |
8ca8b0bb | 79 | #define O2HB_DB_TYPE_LIVENODES 0 |
a6de0136 SM |
80 | #define O2HB_DB_TYPE_LIVEREGIONS 1 |
81 | #define O2HB_DB_TYPE_QUORUMREGIONS 2 | |
82 | #define O2HB_DB_TYPE_FAILEDREGIONS 3 | |
1f285305 SM |
83 | #define O2HB_DB_TYPE_REGION_LIVENODES 4 |
84 | #define O2HB_DB_TYPE_REGION_NUMBER 5 | |
43695d09 | 85 | #define O2HB_DB_TYPE_REGION_ELAPSED_TIME 6 |
cb0586bd | 86 | #define O2HB_DB_TYPE_REGION_PINNED 7 |
8ca8b0bb SM |
87 | struct o2hb_debug_buf { |
88 | int db_type; | |
89 | int db_size; | |
90 | int db_len; | |
91 | void *db_data; | |
92 | }; | |
93 | ||
94 | static struct o2hb_debug_buf *o2hb_db_livenodes; | |
a6de0136 SM |
95 | static struct o2hb_debug_buf *o2hb_db_liveregions; |
96 | static struct o2hb_debug_buf *o2hb_db_quorumregions; | |
97 | static struct o2hb_debug_buf *o2hb_db_failedregions; | |
8ca8b0bb | 98 | |
87d3d3f3 SM |
99 | #define O2HB_DEBUG_DIR "o2hb" |
100 | #define O2HB_DEBUG_LIVENODES "livenodes" | |
a6de0136 SM |
101 | #define O2HB_DEBUG_LIVEREGIONS "live_regions" |
102 | #define O2HB_DEBUG_QUORUMREGIONS "quorum_regions" | |
103 | #define O2HB_DEBUG_FAILEDREGIONS "failed_regions" | |
1f285305 | 104 | #define O2HB_DEBUG_REGION_NUMBER "num" |
43695d09 | 105 | #define O2HB_DEBUG_REGION_ELAPSED_TIME "elapsed_time_in_ms" |
cb0586bd | 106 | #define O2HB_DEBUG_REGION_PINNED "pinned" |
8ca8b0bb | 107 | |
87d3d3f3 SM |
108 | static struct dentry *o2hb_debug_dir; |
109 | static struct dentry *o2hb_debug_livenodes; | |
a6de0136 SM |
110 | static struct dentry *o2hb_debug_liveregions; |
111 | static struct dentry *o2hb_debug_quorumregions; | |
112 | static struct dentry *o2hb_debug_failedregions; | |
87d3d3f3 | 113 | |
a7f6a5fb MF |
114 | static LIST_HEAD(o2hb_all_regions); |
115 | ||
116 | static struct o2hb_callback { | |
117 | struct list_head list; | |
118 | } o2hb_callbacks[O2HB_NUM_CB]; | |
119 | ||
120 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type); | |
121 | ||
122 | #define O2HB_DEFAULT_BLOCK_BITS 9 | |
123 | ||
54b5187b SM |
124 | enum o2hb_heartbeat_modes { |
125 | O2HB_HEARTBEAT_LOCAL = 0, | |
126 | O2HB_HEARTBEAT_GLOBAL, | |
127 | O2HB_HEARTBEAT_NUM_MODES, | |
128 | }; | |
129 | ||
130 | char *o2hb_heartbeat_mode_desc[O2HB_HEARTBEAT_NUM_MODES] = { | |
131 | "local", /* O2HB_HEARTBEAT_LOCAL */ | |
132 | "global", /* O2HB_HEARTBEAT_GLOBAL */ | |
133 | }; | |
134 | ||
a7f6a5fb | 135 | unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD; |
54b5187b | 136 | unsigned int o2hb_heartbeat_mode = O2HB_HEARTBEAT_LOCAL; |
a7f6a5fb | 137 | |
58a3158a SM |
138 | /* |
139 | * o2hb_dependent_users tracks the number of registered callbacks that depend | |
140 | * on heartbeat. o2net and o2dlm are two entities that register this callback. | |
141 | * However only o2dlm depends on the heartbeat. It does not want the heartbeat | |
142 | * to stop while a dlm domain is still active. | |
143 | */ | |
144 | unsigned int o2hb_dependent_users; | |
145 | ||
146 | /* | |
147 | * In global heartbeat mode, all regions are pinned if there are one or more | |
148 | * dependent users and the quorum region count is <= O2HB_PIN_CUT_OFF. All | |
149 | * regions are unpinned if the region count exceeds the cut off or the number | |
150 | * of dependent users falls to zero. | |
151 | */ | |
152 | #define O2HB_PIN_CUT_OFF 3 | |
153 | ||
154 | /* | |
155 | * In local heartbeat mode, we assume the dlm domain name to be the same as | |
156 | * region uuid. This is true for domains created for the file system but not | |
157 | * necessarily true for userdlm domains. This is a known limitation. | |
158 | * | |
159 | * In global heartbeat mode, we pin/unpin all o2hb regions. This solution | |
160 | * works for both file system and userdlm domains. | |
161 | */ | |
162 | static int o2hb_region_pin(const char *region_uuid); | |
163 | static void o2hb_region_unpin(const char *region_uuid); | |
164 | ||
2bd63216 | 165 | /* Only sets a new threshold if there are no active regions. |
a7f6a5fb MF |
166 | * |
167 | * No locking or otherwise interesting code is required for reading | |
168 | * o2hb_dead_threshold as it can't change once regions are active and | |
169 | * it's not interesting to anyone until then anyway. */ | |
170 | static void o2hb_dead_threshold_set(unsigned int threshold) | |
171 | { | |
172 | if (threshold > O2HB_MIN_DEAD_THRESHOLD) { | |
173 | spin_lock(&o2hb_live_lock); | |
174 | if (list_empty(&o2hb_all_regions)) | |
175 | o2hb_dead_threshold = threshold; | |
176 | spin_unlock(&o2hb_live_lock); | |
177 | } | |
178 | } | |
179 | ||
70f651ed | 180 | static int o2hb_global_heartbeat_mode_set(unsigned int hb_mode) |
54b5187b SM |
181 | { |
182 | int ret = -1; | |
183 | ||
184 | if (hb_mode < O2HB_HEARTBEAT_NUM_MODES) { | |
185 | spin_lock(&o2hb_live_lock); | |
186 | if (list_empty(&o2hb_all_regions)) { | |
187 | o2hb_heartbeat_mode = hb_mode; | |
188 | ret = 0; | |
189 | } | |
190 | spin_unlock(&o2hb_live_lock); | |
191 | } | |
192 | ||
193 | return ret; | |
194 | } | |
195 | ||
a7f6a5fb MF |
196 | struct o2hb_node_event { |
197 | struct list_head hn_item; | |
198 | enum o2hb_callback_type hn_event_type; | |
199 | struct o2nm_node *hn_node; | |
200 | int hn_node_num; | |
201 | }; | |
202 | ||
203 | struct o2hb_disk_slot { | |
204 | struct o2hb_disk_heartbeat_block *ds_raw_block; | |
205 | u8 ds_node_num; | |
206 | u64 ds_last_time; | |
207 | u64 ds_last_generation; | |
208 | u16 ds_equal_samples; | |
209 | u16 ds_changed_samples; | |
210 | struct list_head ds_live_item; | |
211 | }; | |
212 | ||
213 | /* each thread owns a region.. when we're asked to tear down the region | |
214 | * we ask the thread to stop, who cleans up the region */ | |
215 | struct o2hb_region { | |
216 | struct config_item hr_item; | |
217 | ||
218 | struct list_head hr_all_item; | |
58a3158a | 219 | unsigned hr_unclean_stop:1, |
d2eece37 | 220 | hr_aborted_start:1, |
58a3158a SM |
221 | hr_item_pinned:1, |
222 | hr_item_dropped:1; | |
a7f6a5fb MF |
223 | |
224 | /* protected by the hr_callback_sem */ | |
225 | struct task_struct *hr_task; | |
226 | ||
227 | unsigned int hr_blocks; | |
228 | unsigned long long hr_start_block; | |
229 | ||
230 | unsigned int hr_block_bits; | |
231 | unsigned int hr_block_bytes; | |
232 | ||
233 | unsigned int hr_slots_per_page; | |
234 | unsigned int hr_num_pages; | |
235 | ||
236 | struct page **hr_slot_data; | |
237 | struct block_device *hr_bdev; | |
238 | struct o2hb_disk_slot *hr_slots; | |
239 | ||
823a637a SM |
240 | /* live node map of this region */ |
241 | unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
536f0741 | 242 | unsigned int hr_region_num; |
823a637a | 243 | |
1f285305 SM |
244 | struct dentry *hr_debug_dir; |
245 | struct dentry *hr_debug_livenodes; | |
246 | struct dentry *hr_debug_regnum; | |
43695d09 | 247 | struct dentry *hr_debug_elapsed_time; |
cb0586bd | 248 | struct dentry *hr_debug_pinned; |
1f285305 SM |
249 | struct o2hb_debug_buf *hr_db_livenodes; |
250 | struct o2hb_debug_buf *hr_db_regnum; | |
43695d09 | 251 | struct o2hb_debug_buf *hr_db_elapsed_time; |
cb0586bd | 252 | struct o2hb_debug_buf *hr_db_pinned; |
1f285305 | 253 | |
a7f6a5fb MF |
254 | /* let the person setting up hb wait for it to return until it |
255 | * has reached a 'steady' state. This will be fixed when we have | |
256 | * a more complete api that doesn't lead to this sort of fragility. */ | |
257 | atomic_t hr_steady_iterations; | |
258 | ||
d2eece37 SM |
259 | /* terminate o2hb thread if it does not reach steady state |
260 | * (hr_steady_iterations == 0) within hr_unsteady_iterations */ | |
261 | atomic_t hr_unsteady_iterations; | |
262 | ||
a7f6a5fb MF |
263 | char hr_dev_name[BDEVNAME_SIZE]; |
264 | ||
265 | unsigned int hr_timeout_ms; | |
266 | ||
267 | /* randomized as the region goes up and down so that a node | |
268 | * recognizes a node going up and down in one iteration */ | |
269 | u64 hr_generation; | |
270 | ||
c4028958 | 271 | struct delayed_work hr_write_timeout_work; |
a7f6a5fb MF |
272 | unsigned long hr_last_timeout_start; |
273 | ||
274 | /* Used during o2hb_check_slot to hold a copy of the block | |
275 | * being checked because we temporarily have to zero out the | |
276 | * crc field. */ | |
277 | struct o2hb_disk_heartbeat_block *hr_tmp_block; | |
278 | }; | |
279 | ||
280 | struct o2hb_bio_wait_ctxt { | |
281 | atomic_t wc_num_reqs; | |
282 | struct completion wc_io_complete; | |
a9e2ae39 | 283 | int wc_error; |
a7f6a5fb MF |
284 | }; |
285 | ||
c4028958 | 286 | static void o2hb_write_timeout(struct work_struct *work) |
a7f6a5fb | 287 | { |
b1c5ebfb SM |
288 | int failed, quorum; |
289 | unsigned long flags; | |
c4028958 DH |
290 | struct o2hb_region *reg = |
291 | container_of(work, struct o2hb_region, | |
292 | hr_write_timeout_work.work); | |
a7f6a5fb MF |
293 | |
294 | mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u " | |
295 | "milliseconds\n", reg->hr_dev_name, | |
2bd63216 | 296 | jiffies_to_msecs(jiffies - reg->hr_last_timeout_start)); |
b1c5ebfb SM |
297 | |
298 | if (o2hb_global_heartbeat_active()) { | |
299 | spin_lock_irqsave(&o2hb_live_lock, flags); | |
300 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
301 | set_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
a8f70de3 | 302 | failed = bitmap_weight(o2hb_failed_region_bitmap, |
b1c5ebfb | 303 | O2NM_MAX_REGIONS); |
a8f70de3 | 304 | quorum = bitmap_weight(o2hb_quorum_region_bitmap, |
b1c5ebfb SM |
305 | O2NM_MAX_REGIONS); |
306 | spin_unlock_irqrestore(&o2hb_live_lock, flags); | |
307 | ||
308 | mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n", | |
309 | quorum, failed); | |
310 | ||
311 | /* | |
312 | * Fence if the number of failed regions >= half the number | |
313 | * of quorum regions | |
314 | */ | |
315 | if ((failed << 1) < quorum) | |
316 | return; | |
317 | } | |
318 | ||
a7f6a5fb MF |
319 | o2quo_disk_timeout(); |
320 | } | |
321 | ||
322 | static void o2hb_arm_write_timeout(struct o2hb_region *reg) | |
323 | { | |
d2eece37 SM |
324 | /* Arm writeout only after thread reaches steady state */ |
325 | if (atomic_read(®->hr_steady_iterations) != 0) | |
326 | return; | |
327 | ||
b31d308d TM |
328 | mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n", |
329 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
a7f6a5fb | 330 | |
b1c5ebfb SM |
331 | if (o2hb_global_heartbeat_active()) { |
332 | spin_lock(&o2hb_live_lock); | |
333 | clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
334 | spin_unlock(&o2hb_live_lock); | |
335 | } | |
a7f6a5fb MF |
336 | cancel_delayed_work(®->hr_write_timeout_work); |
337 | reg->hr_last_timeout_start = jiffies; | |
338 | schedule_delayed_work(®->hr_write_timeout_work, | |
339 | msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS)); | |
340 | } | |
341 | ||
342 | static void o2hb_disarm_write_timeout(struct o2hb_region *reg) | |
343 | { | |
9b00a818 | 344 | cancel_delayed_work_sync(®->hr_write_timeout_work); |
a7f6a5fb MF |
345 | } |
346 | ||
b559292e | 347 | static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc) |
a7f6a5fb | 348 | { |
b559292e | 349 | atomic_set(&wc->wc_num_reqs, 1); |
a7f6a5fb | 350 | init_completion(&wc->wc_io_complete); |
a9e2ae39 | 351 | wc->wc_error = 0; |
a7f6a5fb MF |
352 | } |
353 | ||
354 | /* Used in error paths too */ | |
355 | static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc, | |
356 | unsigned int num) | |
357 | { | |
358 | /* sadly atomic_sub_and_test() isn't available on all platforms. The | |
359 | * good news is that the fast path only completes one at a time */ | |
360 | while(num--) { | |
361 | if (atomic_dec_and_test(&wc->wc_num_reqs)) { | |
362 | BUG_ON(num > 0); | |
363 | complete(&wc->wc_io_complete); | |
364 | } | |
365 | } | |
366 | } | |
367 | ||
368 | static void o2hb_wait_on_io(struct o2hb_region *reg, | |
369 | struct o2hb_bio_wait_ctxt *wc) | |
370 | { | |
b559292e | 371 | o2hb_bio_wait_dec(wc, 1); |
a7f6a5fb MF |
372 | wait_for_completion(&wc->wc_io_complete); |
373 | } | |
374 | ||
782e3b3b | 375 | static void o2hb_bio_end_io(struct bio *bio, |
a7f6a5fb MF |
376 | int error) |
377 | { | |
378 | struct o2hb_bio_wait_ctxt *wc = bio->bi_private; | |
379 | ||
a9e2ae39 | 380 | if (error) { |
a7f6a5fb | 381 | mlog(ML_ERROR, "IO Error %d\n", error); |
a9e2ae39 MF |
382 | wc->wc_error = error; |
383 | } | |
a7f6a5fb | 384 | |
a7f6a5fb | 385 | o2hb_bio_wait_dec(wc, 1); |
b559292e | 386 | bio_put(bio); |
a7f6a5fb MF |
387 | } |
388 | ||
389 | /* Setup a Bio to cover I/O against num_slots slots starting at | |
390 | * start_slot. */ | |
391 | static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, | |
392 | struct o2hb_bio_wait_ctxt *wc, | |
b559292e PR |
393 | unsigned int *current_slot, |
394 | unsigned int max_slots) | |
a7f6a5fb | 395 | { |
b559292e | 396 | int len, current_page; |
a7f6a5fb MF |
397 | unsigned int vec_len, vec_start; |
398 | unsigned int bits = reg->hr_block_bits; | |
399 | unsigned int spp = reg->hr_slots_per_page; | |
b559292e | 400 | unsigned int cs = *current_slot; |
a7f6a5fb MF |
401 | struct bio *bio; |
402 | struct page *page; | |
403 | ||
a7f6a5fb MF |
404 | /* Testing has shown this allocation to take long enough under |
405 | * GFP_KERNEL that the local node can get fenced. It would be | |
406 | * nicest if we could pre-allocate these bios and avoid this | |
407 | * all together. */ | |
b559292e | 408 | bio = bio_alloc(GFP_ATOMIC, 16); |
a7f6a5fb MF |
409 | if (!bio) { |
410 | mlog(ML_ERROR, "Could not alloc slots BIO!\n"); | |
411 | bio = ERR_PTR(-ENOMEM); | |
412 | goto bail; | |
413 | } | |
414 | ||
415 | /* Must put everything in 512 byte sectors for the bio... */ | |
b559292e | 416 | bio->bi_sector = (reg->hr_start_block + cs) << (bits - 9); |
a7f6a5fb MF |
417 | bio->bi_bdev = reg->hr_bdev; |
418 | bio->bi_private = wc; | |
419 | bio->bi_end_io = o2hb_bio_end_io; | |
420 | ||
b559292e PR |
421 | vec_start = (cs << bits) % PAGE_CACHE_SIZE; |
422 | while(cs < max_slots) { | |
423 | current_page = cs / spp; | |
424 | page = reg->hr_slot_data[current_page]; | |
a7f6a5fb | 425 | |
bc7e97cb | 426 | vec_len = min(PAGE_CACHE_SIZE - vec_start, |
b559292e | 427 | (max_slots-cs) * (PAGE_CACHE_SIZE/spp) ); |
a7f6a5fb MF |
428 | |
429 | mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", | |
b559292e | 430 | current_page, vec_len, vec_start); |
a7f6a5fb MF |
431 | |
432 | len = bio_add_page(bio, page, vec_len, vec_start); | |
b559292e | 433 | if (len != vec_len) break; |
a7f6a5fb | 434 | |
b559292e | 435 | cs += vec_len / (PAGE_CACHE_SIZE/spp); |
a7f6a5fb MF |
436 | vec_start = 0; |
437 | } | |
438 | ||
439 | bail: | |
b559292e | 440 | *current_slot = cs; |
a7f6a5fb MF |
441 | return bio; |
442 | } | |
443 | ||
a7f6a5fb MF |
444 | static int o2hb_read_slots(struct o2hb_region *reg, |
445 | unsigned int max_slots) | |
446 | { | |
b559292e PR |
447 | unsigned int current_slot=0; |
448 | int status; | |
a7f6a5fb | 449 | struct o2hb_bio_wait_ctxt wc; |
a7f6a5fb MF |
450 | struct bio *bio; |
451 | ||
b559292e | 452 | o2hb_bio_wait_init(&wc); |
a7f6a5fb | 453 | |
b559292e PR |
454 | while(current_slot < max_slots) { |
455 | bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots); | |
a7f6a5fb | 456 | if (IS_ERR(bio)) { |
a7f6a5fb MF |
457 | status = PTR_ERR(bio); |
458 | mlog_errno(status); | |
459 | goto bail_and_wait; | |
460 | } | |
a7f6a5fb | 461 | |
b559292e | 462 | atomic_inc(&wc.wc_num_reqs); |
a7f6a5fb MF |
463 | submit_bio(READ, bio); |
464 | } | |
465 | ||
466 | status = 0; | |
467 | ||
468 | bail_and_wait: | |
469 | o2hb_wait_on_io(reg, &wc); | |
a9e2ae39 MF |
470 | if (wc.wc_error && !status) |
471 | status = wc.wc_error; | |
a7f6a5fb | 472 | |
a7f6a5fb MF |
473 | return status; |
474 | } | |
475 | ||
476 | static int o2hb_issue_node_write(struct o2hb_region *reg, | |
a7f6a5fb MF |
477 | struct o2hb_bio_wait_ctxt *write_wc) |
478 | { | |
479 | int status; | |
480 | unsigned int slot; | |
481 | struct bio *bio; | |
482 | ||
b559292e | 483 | o2hb_bio_wait_init(write_wc); |
a7f6a5fb MF |
484 | |
485 | slot = o2nm_this_node(); | |
486 | ||
b559292e | 487 | bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1); |
a7f6a5fb MF |
488 | if (IS_ERR(bio)) { |
489 | status = PTR_ERR(bio); | |
490 | mlog_errno(status); | |
491 | goto bail; | |
492 | } | |
493 | ||
b559292e | 494 | atomic_inc(&write_wc->wc_num_reqs); |
e873fdb5 | 495 | submit_bio(WRITE_SYNC, bio); |
a7f6a5fb | 496 | |
a7f6a5fb MF |
497 | status = 0; |
498 | bail: | |
499 | return status; | |
500 | } | |
501 | ||
502 | static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, | |
503 | struct o2hb_disk_heartbeat_block *hb_block) | |
504 | { | |
505 | __le32 old_cksum; | |
506 | u32 ret; | |
507 | ||
508 | /* We want to compute the block crc with a 0 value in the | |
509 | * hb_cksum field. Save it off here and replace after the | |
510 | * crc. */ | |
511 | old_cksum = hb_block->hb_cksum; | |
512 | hb_block->hb_cksum = 0; | |
513 | ||
514 | ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); | |
515 | ||
516 | hb_block->hb_cksum = old_cksum; | |
517 | ||
518 | return ret; | |
519 | } | |
520 | ||
521 | static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) | |
522 | { | |
70bacbdb MF |
523 | mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, " |
524 | "cksum = 0x%x, generation 0x%llx\n", | |
525 | (long long)le64_to_cpu(hb_block->hb_seq), | |
526 | hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum), | |
527 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
528 | } |
529 | ||
530 | static int o2hb_verify_crc(struct o2hb_region *reg, | |
531 | struct o2hb_disk_heartbeat_block *hb_block) | |
532 | { | |
533 | u32 read, computed; | |
534 | ||
535 | read = le32_to_cpu(hb_block->hb_cksum); | |
536 | computed = o2hb_compute_block_crc_le(reg, hb_block); | |
537 | ||
538 | return read == computed; | |
539 | } | |
540 | ||
d2eece37 SM |
541 | /* |
542 | * Compare the slot data with what we wrote in the last iteration. | |
543 | * If the match fails, print an appropriate error message. This is to | |
544 | * detect errors like... another node hearting on the same slot, | |
545 | * flaky device that is losing writes, etc. | |
546 | * Returns 1 if check succeeds, 0 otherwise. | |
547 | */ | |
548 | static int o2hb_check_own_slot(struct o2hb_region *reg) | |
a7f6a5fb | 549 | { |
a7f6a5fb MF |
550 | struct o2hb_disk_slot *slot; |
551 | struct o2hb_disk_heartbeat_block *hb_block; | |
33c12a54 | 552 | char *errstr; |
a7f6a5fb | 553 | |
33c12a54 | 554 | slot = ®->hr_slots[o2nm_this_node()]; |
a7f6a5fb | 555 | /* Don't check on our 1st timestamp */ |
33c12a54 | 556 | if (!slot->ds_last_time) |
d2eece37 | 557 | return 0; |
a7f6a5fb | 558 | |
33c12a54 SM |
559 | hb_block = slot->ds_raw_block; |
560 | if (le64_to_cpu(hb_block->hb_seq) == slot->ds_last_time && | |
561 | le64_to_cpu(hb_block->hb_generation) == slot->ds_last_generation && | |
562 | hb_block->hb_node == slot->ds_node_num) | |
d2eece37 | 563 | return 1; |
a7f6a5fb | 564 | |
33c12a54 SM |
565 | #define ERRSTR1 "Another node is heartbeating on device" |
566 | #define ERRSTR2 "Heartbeat generation mismatch on device" | |
567 | #define ERRSTR3 "Heartbeat sequence mismatch on device" | |
568 | ||
569 | if (hb_block->hb_node != slot->ds_node_num) | |
570 | errstr = ERRSTR1; | |
571 | else if (le64_to_cpu(hb_block->hb_generation) != | |
572 | slot->ds_last_generation) | |
573 | errstr = ERRSTR2; | |
574 | else | |
575 | errstr = ERRSTR3; | |
576 | ||
577 | mlog(ML_ERROR, "%s (%s): expected(%u:0x%llx, 0x%llx), " | |
578 | "ondisk(%u:0x%llx, 0x%llx)\n", errstr, reg->hr_dev_name, | |
579 | slot->ds_node_num, (unsigned long long)slot->ds_last_generation, | |
580 | (unsigned long long)slot->ds_last_time, hb_block->hb_node, | |
581 | (unsigned long long)le64_to_cpu(hb_block->hb_generation), | |
582 | (unsigned long long)le64_to_cpu(hb_block->hb_seq)); | |
d2eece37 SM |
583 | |
584 | return 0; | |
a7f6a5fb MF |
585 | } |
586 | ||
587 | static inline void o2hb_prepare_block(struct o2hb_region *reg, | |
588 | u64 generation) | |
589 | { | |
590 | int node_num; | |
591 | u64 cputime; | |
592 | struct o2hb_disk_slot *slot; | |
593 | struct o2hb_disk_heartbeat_block *hb_block; | |
594 | ||
595 | node_num = o2nm_this_node(); | |
596 | slot = ®->hr_slots[node_num]; | |
597 | ||
598 | hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; | |
599 | memset(hb_block, 0, reg->hr_block_bytes); | |
600 | /* TODO: time stuff */ | |
601 | cputime = CURRENT_TIME.tv_sec; | |
602 | if (!cputime) | |
603 | cputime = 1; | |
604 | ||
605 | hb_block->hb_seq = cpu_to_le64(cputime); | |
606 | hb_block->hb_node = node_num; | |
607 | hb_block->hb_generation = cpu_to_le64(generation); | |
0db638f4 | 608 | hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS); |
a7f6a5fb MF |
609 | |
610 | /* This step must always happen last! */ | |
611 | hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, | |
612 | hb_block)); | |
613 | ||
70bacbdb | 614 | mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n", |
5fdf1e67 | 615 | (long long)generation, |
70bacbdb | 616 | le32_to_cpu(hb_block->hb_cksum)); |
a7f6a5fb MF |
617 | } |
618 | ||
619 | static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, | |
620 | struct o2nm_node *node, | |
621 | int idx) | |
622 | { | |
a7f6a5fb MF |
623 | struct o2hb_callback_func *f; |
624 | ||
df53cd3b | 625 | list_for_each_entry(f, &hbcall->list, hc_item) { |
a7f6a5fb MF |
626 | mlog(ML_HEARTBEAT, "calling funcs %p\n", f); |
627 | (f->hc_func)(node, idx, f->hc_data); | |
628 | } | |
629 | } | |
630 | ||
631 | /* Will run the list in order until we process the passed event */ | |
632 | static void o2hb_run_event_list(struct o2hb_node_event *queued_event) | |
633 | { | |
a7f6a5fb MF |
634 | struct o2hb_callback *hbcall; |
635 | struct o2hb_node_event *event; | |
636 | ||
a7f6a5fb MF |
637 | /* Holding callback sem assures we don't alter the callback |
638 | * lists when doing this, and serializes ourselves with other | |
639 | * processes wanting callbacks. */ | |
640 | down_write(&o2hb_callback_sem); | |
641 | ||
642 | spin_lock(&o2hb_live_lock); | |
643 | while (!list_empty(&o2hb_node_events) | |
644 | && !list_empty(&queued_event->hn_item)) { | |
645 | event = list_entry(o2hb_node_events.next, | |
646 | struct o2hb_node_event, | |
647 | hn_item); | |
648 | list_del_init(&event->hn_item); | |
649 | spin_unlock(&o2hb_live_lock); | |
650 | ||
651 | mlog(ML_HEARTBEAT, "Node %s event for %d\n", | |
652 | event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", | |
653 | event->hn_node_num); | |
654 | ||
655 | hbcall = hbcall_from_type(event->hn_event_type); | |
656 | ||
657 | /* We should *never* have gotten on to the list with a | |
658 | * bad type... This isn't something that we should try | |
659 | * to recover from. */ | |
660 | BUG_ON(IS_ERR(hbcall)); | |
661 | ||
662 | o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); | |
663 | ||
664 | spin_lock(&o2hb_live_lock); | |
665 | } | |
666 | spin_unlock(&o2hb_live_lock); | |
667 | ||
668 | up_write(&o2hb_callback_sem); | |
669 | } | |
670 | ||
671 | static void o2hb_queue_node_event(struct o2hb_node_event *event, | |
672 | enum o2hb_callback_type type, | |
673 | struct o2nm_node *node, | |
674 | int node_num) | |
675 | { | |
676 | assert_spin_locked(&o2hb_live_lock); | |
677 | ||
0e105d37 SM |
678 | BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB)); |
679 | ||
a7f6a5fb MF |
680 | event->hn_event_type = type; |
681 | event->hn_node = node; | |
682 | event->hn_node_num = node_num; | |
683 | ||
684 | mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", | |
685 | type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); | |
686 | ||
687 | list_add_tail(&event->hn_item, &o2hb_node_events); | |
688 | } | |
689 | ||
690 | static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) | |
691 | { | |
692 | struct o2hb_node_event event = | |
693 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
694 | struct o2nm_node *node; | |
6f8648e8 | 695 | int queued = 0; |
a7f6a5fb MF |
696 | |
697 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
698 | if (!node) | |
699 | return; | |
700 | ||
701 | spin_lock(&o2hb_live_lock); | |
702 | if (!list_empty(&slot->ds_live_item)) { | |
703 | mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", | |
704 | slot->ds_node_num); | |
705 | ||
706 | list_del_init(&slot->ds_live_item); | |
707 | ||
708 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
709 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
710 | ||
711 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
712 | slot->ds_node_num); | |
6f8648e8 | 713 | queued = 1; |
a7f6a5fb MF |
714 | } |
715 | } | |
716 | spin_unlock(&o2hb_live_lock); | |
717 | ||
6f8648e8 J |
718 | if (queued) |
719 | o2hb_run_event_list(&event); | |
a7f6a5fb MF |
720 | |
721 | o2nm_node_put(node); | |
722 | } | |
723 | ||
d2eece37 | 724 | static void o2hb_set_quorum_device(struct o2hb_region *reg) |
43182d2a | 725 | { |
43182d2a SM |
726 | if (!o2hb_global_heartbeat_active()) |
727 | return; | |
728 | ||
d2eece37 SM |
729 | /* Prevent race with o2hb_heartbeat_group_drop_item() */ |
730 | if (kthread_should_stop()) | |
43182d2a SM |
731 | return; |
732 | ||
d2eece37 SM |
733 | /* Tag region as quorum only after thread reaches steady state */ |
734 | if (atomic_read(®->hr_steady_iterations) != 0) | |
735 | return; | |
736 | ||
737 | spin_lock(&o2hb_live_lock); | |
738 | ||
739 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
740 | goto unlock; | |
741 | ||
43182d2a SM |
742 | /* |
743 | * A region can be added to the quorum only when it sees all | |
744 | * live nodes heartbeat on it. In other words, the region has been | |
745 | * added to all nodes. | |
746 | */ | |
747 | if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap, | |
748 | sizeof(o2hb_live_node_bitmap))) | |
d2eece37 | 749 | goto unlock; |
43182d2a | 750 | |
d2eece37 SM |
751 | printk(KERN_NOTICE "o2hb: Region %s (%s) is now a quorum device\n", |
752 | config_item_name(®->hr_item), reg->hr_dev_name); | |
43182d2a SM |
753 | |
754 | set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
58a3158a SM |
755 | |
756 | /* | |
757 | * If global heartbeat active, unpin all regions if the | |
758 | * region count > CUT_OFF | |
759 | */ | |
a8f70de3 | 760 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
761 | O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF) |
762 | o2hb_region_unpin(NULL); | |
d2eece37 SM |
763 | unlock: |
764 | spin_unlock(&o2hb_live_lock); | |
43182d2a SM |
765 | } |
766 | ||
a7f6a5fb MF |
767 | static int o2hb_check_slot(struct o2hb_region *reg, |
768 | struct o2hb_disk_slot *slot) | |
769 | { | |
770 | int changed = 0, gen_changed = 0; | |
771 | struct o2hb_node_event event = | |
772 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
773 | struct o2nm_node *node; | |
774 | struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; | |
775 | u64 cputime; | |
0db638f4 MF |
776 | unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS; |
777 | unsigned int slot_dead_ms; | |
0e105d37 | 778 | int tmp; |
6f8648e8 | 779 | int queued = 0; |
a7f6a5fb MF |
780 | |
781 | memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); | |
782 | ||
0e105d37 SM |
783 | /* |
784 | * If a node is no longer configured but is still in the livemap, we | |
785 | * may need to clear that bit from the livemap. | |
786 | */ | |
a7f6a5fb | 787 | node = o2nm_get_node_by_num(slot->ds_node_num); |
0e105d37 SM |
788 | if (!node) { |
789 | spin_lock(&o2hb_live_lock); | |
790 | tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
791 | spin_unlock(&o2hb_live_lock); | |
792 | if (!tmp) | |
793 | return 0; | |
794 | } | |
a7f6a5fb MF |
795 | |
796 | if (!o2hb_verify_crc(reg, hb_block)) { | |
797 | /* all paths from here will drop o2hb_live_lock for | |
798 | * us. */ | |
799 | spin_lock(&o2hb_live_lock); | |
800 | ||
801 | /* Don't print an error on the console in this case - | |
802 | * a freshly formatted heartbeat area will not have a | |
803 | * crc set on it. */ | |
804 | if (list_empty(&slot->ds_live_item)) | |
805 | goto out; | |
806 | ||
807 | /* The node is live but pushed out a bad crc. We | |
808 | * consider it a transient miss but don't populate any | |
809 | * other values as they may be junk. */ | |
810 | mlog(ML_ERROR, "Node %d has written a bad crc to %s\n", | |
811 | slot->ds_node_num, reg->hr_dev_name); | |
812 | o2hb_dump_slot(hb_block); | |
813 | ||
814 | slot->ds_equal_samples++; | |
815 | goto fire_callbacks; | |
816 | } | |
817 | ||
818 | /* we don't care if these wrap.. the state transitions below | |
819 | * clear at the right places */ | |
820 | cputime = le64_to_cpu(hb_block->hb_seq); | |
821 | if (slot->ds_last_time != cputime) | |
822 | slot->ds_changed_samples++; | |
823 | else | |
824 | slot->ds_equal_samples++; | |
825 | slot->ds_last_time = cputime; | |
826 | ||
827 | /* The node changed heartbeat generations. We assume this to | |
828 | * mean it dropped off but came back before we timed out. We | |
829 | * want to consider it down for the time being but don't want | |
830 | * to lose any changed_samples state we might build up to | |
831 | * considering it live again. */ | |
832 | if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { | |
833 | gen_changed = 1; | |
834 | slot->ds_equal_samples = 0; | |
70bacbdb MF |
835 | mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx " |
836 | "to 0x%llx)\n", slot->ds_node_num, | |
837 | (long long)slot->ds_last_generation, | |
838 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
839 | } |
840 | ||
841 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
842 | ||
70bacbdb MF |
843 | mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x " |
844 | "seq %llu last %llu changed %u equal %u\n", | |
845 | slot->ds_node_num, (long long)slot->ds_last_generation, | |
846 | le32_to_cpu(hb_block->hb_cksum), | |
2bd63216 | 847 | (unsigned long long)le64_to_cpu(hb_block->hb_seq), |
70bacbdb | 848 | (unsigned long long)slot->ds_last_time, slot->ds_changed_samples, |
a7f6a5fb MF |
849 | slot->ds_equal_samples); |
850 | ||
851 | spin_lock(&o2hb_live_lock); | |
852 | ||
853 | fire_callbacks: | |
854 | /* dead nodes only come to life after some number of | |
855 | * changes at any time during their dead time */ | |
856 | if (list_empty(&slot->ds_live_item) && | |
857 | slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { | |
70bacbdb MF |
858 | mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n", |
859 | slot->ds_node_num, (long long)slot->ds_last_generation); | |
a7f6a5fb | 860 | |
823a637a SM |
861 | set_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
862 | ||
a7f6a5fb MF |
863 | /* first on the list generates a callback */ |
864 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
865 | mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes " |
866 | "bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
867 | set_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
868 | ||
869 | o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, | |
870 | slot->ds_node_num); | |
871 | ||
872 | changed = 1; | |
6f8648e8 | 873 | queued = 1; |
a7f6a5fb MF |
874 | } |
875 | ||
876 | list_add_tail(&slot->ds_live_item, | |
877 | &o2hb_live_slots[slot->ds_node_num]); | |
878 | ||
879 | slot->ds_equal_samples = 0; | |
0db638f4 MF |
880 | |
881 | /* We want to be sure that all nodes agree on the | |
882 | * number of milliseconds before a node will be | |
883 | * considered dead. The self-fencing timeout is | |
884 | * computed from this value, and a discrepancy might | |
885 | * result in heartbeat calling a node dead when it | |
886 | * hasn't self-fenced yet. */ | |
887 | slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms); | |
888 | if (slot_dead_ms && slot_dead_ms != dead_ms) { | |
889 | /* TODO: Perhaps we can fail the region here. */ | |
890 | mlog(ML_ERROR, "Node %d on device %s has a dead count " | |
891 | "of %u ms, but our count is %u ms.\n" | |
892 | "Please double check your configuration values " | |
893 | "for 'O2CB_HEARTBEAT_THRESHOLD'\n", | |
894 | slot->ds_node_num, reg->hr_dev_name, slot_dead_ms, | |
895 | dead_ms); | |
896 | } | |
a7f6a5fb MF |
897 | goto out; |
898 | } | |
899 | ||
900 | /* if the list is dead, we're done.. */ | |
901 | if (list_empty(&slot->ds_live_item)) | |
902 | goto out; | |
903 | ||
904 | /* live nodes only go dead after enough consequtive missed | |
905 | * samples.. reset the missed counter whenever we see | |
906 | * activity */ | |
907 | if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { | |
908 | mlog(ML_HEARTBEAT, "Node %d left my region\n", | |
909 | slot->ds_node_num); | |
910 | ||
823a637a SM |
911 | clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
912 | ||
a7f6a5fb MF |
913 | /* last off the live_slot generates a callback */ |
914 | list_del_init(&slot->ds_live_item); | |
915 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
916 | mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live " |
917 | "nodes bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
918 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
919 | ||
0e105d37 SM |
920 | /* node can be null */ |
921 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, | |
922 | node, slot->ds_node_num); | |
a7f6a5fb MF |
923 | |
924 | changed = 1; | |
6f8648e8 | 925 | queued = 1; |
a7f6a5fb MF |
926 | } |
927 | ||
928 | /* We don't clear this because the node is still | |
929 | * actually writing new blocks. */ | |
930 | if (!gen_changed) | |
931 | slot->ds_changed_samples = 0; | |
932 | goto out; | |
933 | } | |
934 | if (slot->ds_changed_samples) { | |
935 | slot->ds_changed_samples = 0; | |
936 | slot->ds_equal_samples = 0; | |
937 | } | |
938 | out: | |
939 | spin_unlock(&o2hb_live_lock); | |
940 | ||
6f8648e8 J |
941 | if (queued) |
942 | o2hb_run_event_list(&event); | |
a7f6a5fb | 943 | |
0e105d37 SM |
944 | if (node) |
945 | o2nm_node_put(node); | |
a7f6a5fb MF |
946 | return changed; |
947 | } | |
948 | ||
518df6bd | 949 | static int o2hb_highest_node(unsigned long *nodes, int numbits) |
a7f6a5fb | 950 | { |
518df6bd | 951 | return find_last_bit(nodes, numbits); |
a7f6a5fb MF |
952 | } |
953 | ||
a9e2ae39 | 954 | static int o2hb_do_disk_heartbeat(struct o2hb_region *reg) |
a7f6a5fb | 955 | { |
d2eece37 SM |
956 | int i, ret, highest_node; |
957 | int membership_change = 0, own_slot_ok = 0; | |
a7f6a5fb | 958 | unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
0e105d37 | 959 | unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
a7f6a5fb MF |
960 | struct o2hb_bio_wait_ctxt write_wc; |
961 | ||
a9e2ae39 MF |
962 | ret = o2nm_configured_node_map(configured_nodes, |
963 | sizeof(configured_nodes)); | |
964 | if (ret) { | |
965 | mlog_errno(ret); | |
d2eece37 | 966 | goto bail; |
a9e2ae39 | 967 | } |
a7f6a5fb | 968 | |
0e105d37 SM |
969 | /* |
970 | * If a node is not configured but is in the livemap, we still need | |
971 | * to read the slot so as to be able to remove it from the livemap. | |
972 | */ | |
973 | o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap)); | |
974 | i = -1; | |
975 | while ((i = find_next_bit(live_node_bitmap, | |
976 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
977 | set_bit(i, configured_nodes); | |
978 | } | |
979 | ||
a7f6a5fb MF |
980 | highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); |
981 | if (highest_node >= O2NM_MAX_NODES) { | |
d2eece37 SM |
982 | mlog(ML_NOTICE, "o2hb: No configured nodes found!\n"); |
983 | ret = -EINVAL; | |
984 | goto bail; | |
a7f6a5fb MF |
985 | } |
986 | ||
987 | /* No sense in reading the slots of nodes that don't exist | |
988 | * yet. Of course, if the node definitions have holes in them | |
989 | * then we're reading an empty slot anyway... Consider this | |
990 | * best-effort. */ | |
991 | ret = o2hb_read_slots(reg, highest_node + 1); | |
992 | if (ret < 0) { | |
993 | mlog_errno(ret); | |
d2eece37 | 994 | goto bail; |
a7f6a5fb MF |
995 | } |
996 | ||
997 | /* With an up to date view of the slots, we can check that no | |
998 | * other node has been improperly configured to heartbeat in | |
999 | * our slot. */ | |
d2eece37 | 1000 | own_slot_ok = o2hb_check_own_slot(reg); |
a7f6a5fb MF |
1001 | |
1002 | /* fill in the proper info for our next heartbeat */ | |
1003 | o2hb_prepare_block(reg, reg->hr_generation); | |
1004 | ||
b559292e | 1005 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
1006 | if (ret < 0) { |
1007 | mlog_errno(ret); | |
d2eece37 | 1008 | goto bail; |
a7f6a5fb MF |
1009 | } |
1010 | ||
1011 | i = -1; | |
33c12a54 SM |
1012 | while((i = find_next_bit(configured_nodes, |
1013 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
d2eece37 | 1014 | membership_change |= o2hb_check_slot(reg, ®->hr_slots[i]); |
a7f6a5fb MF |
1015 | } |
1016 | ||
1017 | /* | |
1018 | * We have to be sure we've advertised ourselves on disk | |
1019 | * before we can go to steady state. This ensures that | |
1020 | * people we find in our steady state have seen us. | |
1021 | */ | |
1022 | o2hb_wait_on_io(reg, &write_wc); | |
a9e2ae39 MF |
1023 | if (write_wc.wc_error) { |
1024 | /* Do not re-arm the write timeout on I/O error - we | |
1025 | * can't be sure that the new block ever made it to | |
1026 | * disk */ | |
1027 | mlog(ML_ERROR, "Write error %d on device \"%s\"\n", | |
1028 | write_wc.wc_error, reg->hr_dev_name); | |
d2eece37 SM |
1029 | ret = write_wc.wc_error; |
1030 | goto bail; | |
a9e2ae39 MF |
1031 | } |
1032 | ||
d2eece37 SM |
1033 | /* Skip disarming the timeout if own slot has stale/bad data */ |
1034 | if (own_slot_ok) { | |
1035 | o2hb_set_quorum_device(reg); | |
1036 | o2hb_arm_write_timeout(reg); | |
1037 | } | |
a7f6a5fb | 1038 | |
d2eece37 | 1039 | bail: |
a7f6a5fb | 1040 | /* let the person who launched us know when things are steady */ |
d2eece37 SM |
1041 | if (atomic_read(®->hr_steady_iterations) != 0) { |
1042 | if (!ret && own_slot_ok && !membership_change) { | |
1043 | if (atomic_dec_and_test(®->hr_steady_iterations)) | |
1044 | wake_up(&o2hb_steady_queue); | |
1045 | } | |
1046 | } | |
1047 | ||
1048 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
1049 | if (atomic_dec_and_test(®->hr_unsteady_iterations)) { | |
1050 | printk(KERN_NOTICE "o2hb: Unable to stabilize " | |
1051 | "heartbeart on region %s (%s)\n", | |
1052 | config_item_name(®->hr_item), | |
1053 | reg->hr_dev_name); | |
1054 | atomic_set(®->hr_steady_iterations, 0); | |
1055 | reg->hr_aborted_start = 1; | |
a7f6a5fb | 1056 | wake_up(&o2hb_steady_queue); |
d2eece37 SM |
1057 | ret = -EIO; |
1058 | } | |
a7f6a5fb | 1059 | } |
a9e2ae39 | 1060 | |
d2eece37 | 1061 | return ret; |
a7f6a5fb MF |
1062 | } |
1063 | ||
1064 | /* Subtract b from a, storing the result in a. a *must* have a larger | |
1065 | * value than b. */ | |
1066 | static void o2hb_tv_subtract(struct timeval *a, | |
1067 | struct timeval *b) | |
1068 | { | |
1069 | /* just return 0 when a is after b */ | |
1070 | if (a->tv_sec < b->tv_sec || | |
1071 | (a->tv_sec == b->tv_sec && a->tv_usec < b->tv_usec)) { | |
1072 | a->tv_sec = 0; | |
1073 | a->tv_usec = 0; | |
1074 | return; | |
1075 | } | |
1076 | ||
1077 | a->tv_sec -= b->tv_sec; | |
1078 | a->tv_usec -= b->tv_usec; | |
1079 | while ( a->tv_usec < 0 ) { | |
1080 | a->tv_sec--; | |
1081 | a->tv_usec += 1000000; | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | static unsigned int o2hb_elapsed_msecs(struct timeval *start, | |
1086 | struct timeval *end) | |
1087 | { | |
1088 | struct timeval res = *end; | |
1089 | ||
1090 | o2hb_tv_subtract(&res, start); | |
1091 | ||
1092 | return res.tv_sec * 1000 + res.tv_usec / 1000; | |
1093 | } | |
1094 | ||
1095 | /* | |
1096 | * we ride the region ref that the region dir holds. before the region | |
1097 | * dir is removed and drops it ref it will wait to tear down this | |
1098 | * thread. | |
1099 | */ | |
1100 | static int o2hb_thread(void *data) | |
1101 | { | |
1102 | int i, ret; | |
1103 | struct o2hb_region *reg = data; | |
a7f6a5fb MF |
1104 | struct o2hb_bio_wait_ctxt write_wc; |
1105 | struct timeval before_hb, after_hb; | |
1106 | unsigned int elapsed_msec; | |
1107 | ||
1108 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); | |
1109 | ||
1110 | set_user_nice(current, -20); | |
1111 | ||
cfc069d3 SM |
1112 | /* Pin node */ |
1113 | o2nm_depend_this_node(); | |
1114 | ||
d2eece37 SM |
1115 | while (!kthread_should_stop() && |
1116 | !reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
a7f6a5fb | 1117 | /* We track the time spent inside |
025dfdaf | 1118 | * o2hb_do_disk_heartbeat so that we avoid more than |
a7f6a5fb MF |
1119 | * hr_timeout_ms between disk writes. On busy systems |
1120 | * this should result in a heartbeat which is less | |
1121 | * likely to time itself out. */ | |
1122 | do_gettimeofday(&before_hb); | |
1123 | ||
d2eece37 | 1124 | ret = o2hb_do_disk_heartbeat(reg); |
a7f6a5fb MF |
1125 | |
1126 | do_gettimeofday(&after_hb); | |
1127 | elapsed_msec = o2hb_elapsed_msecs(&before_hb, &after_hb); | |
1128 | ||
b31d308d TM |
1129 | mlog(ML_HEARTBEAT, |
1130 | "start = %lu.%lu, end = %lu.%lu, msec = %u\n", | |
215c7f9f MF |
1131 | before_hb.tv_sec, (unsigned long) before_hb.tv_usec, |
1132 | after_hb.tv_sec, (unsigned long) after_hb.tv_usec, | |
1133 | elapsed_msec); | |
a7f6a5fb | 1134 | |
d2eece37 SM |
1135 | if (!kthread_should_stop() && |
1136 | elapsed_msec < reg->hr_timeout_ms) { | |
a7f6a5fb MF |
1137 | /* the kthread api has blocked signals for us so no |
1138 | * need to record the return value. */ | |
1139 | msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); | |
1140 | } | |
1141 | } | |
1142 | ||
1143 | o2hb_disarm_write_timeout(reg); | |
1144 | ||
1145 | /* unclean stop is only used in very bad situation */ | |
1146 | for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) | |
1147 | o2hb_shutdown_slot(®->hr_slots[i]); | |
1148 | ||
1149 | /* Explicit down notification - avoid forcing the other nodes | |
1150 | * to timeout on this region when we could just as easily | |
1151 | * write a clear generation - thus indicating to them that | |
1152 | * this node has left this region. | |
d2eece37 SM |
1153 | */ |
1154 | if (!reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
1155 | o2hb_prepare_block(reg, 0); | |
1156 | ret = o2hb_issue_node_write(reg, &write_wc); | |
1157 | if (ret == 0) | |
1158 | o2hb_wait_on_io(reg, &write_wc); | |
1159 | else | |
1160 | mlog_errno(ret); | |
a7f6a5fb MF |
1161 | } |
1162 | ||
cfc069d3 SM |
1163 | /* Unpin node */ |
1164 | o2nm_undepend_this_node(); | |
a7f6a5fb | 1165 | |
d2eece37 | 1166 | mlog(ML_HEARTBEAT|ML_KTHREAD, "o2hb thread exiting\n"); |
a7f6a5fb MF |
1167 | |
1168 | return 0; | |
1169 | } | |
1170 | ||
87d3d3f3 SM |
1171 | #ifdef CONFIG_DEBUG_FS |
1172 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1173 | { | |
8ca8b0bb | 1174 | struct o2hb_debug_buf *db = inode->i_private; |
1f285305 | 1175 | struct o2hb_region *reg; |
87d3d3f3 | 1176 | unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
bb570a5d | 1177 | unsigned long lts; |
87d3d3f3 SM |
1178 | char *buf = NULL; |
1179 | int i = -1; | |
1180 | int out = 0; | |
1181 | ||
8ca8b0bb SM |
1182 | /* max_nodes should be the largest bitmap we pass here */ |
1183 | BUG_ON(sizeof(map) < db->db_size); | |
1184 | ||
87d3d3f3 SM |
1185 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
1186 | if (!buf) | |
1187 | goto bail; | |
1188 | ||
8ca8b0bb SM |
1189 | switch (db->db_type) { |
1190 | case O2HB_DB_TYPE_LIVENODES: | |
a6de0136 SM |
1191 | case O2HB_DB_TYPE_LIVEREGIONS: |
1192 | case O2HB_DB_TYPE_QUORUMREGIONS: | |
1193 | case O2HB_DB_TYPE_FAILEDREGIONS: | |
8ca8b0bb SM |
1194 | spin_lock(&o2hb_live_lock); |
1195 | memcpy(map, db->db_data, db->db_size); | |
1196 | spin_unlock(&o2hb_live_lock); | |
1197 | break; | |
87d3d3f3 | 1198 | |
1f285305 SM |
1199 | case O2HB_DB_TYPE_REGION_LIVENODES: |
1200 | spin_lock(&o2hb_live_lock); | |
1201 | reg = (struct o2hb_region *)db->db_data; | |
1202 | memcpy(map, reg->hr_live_node_bitmap, db->db_size); | |
1203 | spin_unlock(&o2hb_live_lock); | |
1204 | break; | |
1205 | ||
1206 | case O2HB_DB_TYPE_REGION_NUMBER: | |
1207 | reg = (struct o2hb_region *)db->db_data; | |
1208 | out += snprintf(buf + out, PAGE_SIZE - out, "%d\n", | |
1209 | reg->hr_region_num); | |
1210 | goto done; | |
1211 | ||
43695d09 SM |
1212 | case O2HB_DB_TYPE_REGION_ELAPSED_TIME: |
1213 | reg = (struct o2hb_region *)db->db_data; | |
bb570a5d SM |
1214 | lts = reg->hr_last_timeout_start; |
1215 | /* If 0, it has never been set before */ | |
1216 | if (lts) | |
1217 | lts = jiffies_to_msecs(jiffies - lts); | |
1218 | out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); | |
43695d09 SM |
1219 | goto done; |
1220 | ||
cb0586bd SM |
1221 | case O2HB_DB_TYPE_REGION_PINNED: |
1222 | reg = (struct o2hb_region *)db->db_data; | |
1223 | out += snprintf(buf + out, PAGE_SIZE - out, "%u\n", | |
1224 | !!reg->hr_item_pinned); | |
1225 | goto done; | |
1226 | ||
8ca8b0bb SM |
1227 | default: |
1228 | goto done; | |
1229 | } | |
1230 | ||
1231 | while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len) | |
87d3d3f3 SM |
1232 | out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i); |
1233 | out += snprintf(buf + out, PAGE_SIZE - out, "\n"); | |
1234 | ||
8ca8b0bb | 1235 | done: |
87d3d3f3 SM |
1236 | i_size_write(inode, out); |
1237 | ||
1238 | file->private_data = buf; | |
1239 | ||
1240 | return 0; | |
1241 | bail: | |
1242 | return -ENOMEM; | |
1243 | } | |
1244 | ||
1245 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1246 | { | |
1247 | kfree(file->private_data); | |
1248 | return 0; | |
1249 | } | |
1250 | ||
1251 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1252 | size_t nbytes, loff_t *ppos) | |
1253 | { | |
1254 | return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, | |
1255 | i_size_read(file->f_mapping->host)); | |
1256 | } | |
1257 | #else | |
1258 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1259 | { | |
1260 | return 0; | |
1261 | } | |
1262 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1263 | { | |
1264 | return 0; | |
1265 | } | |
1266 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1267 | size_t nbytes, loff_t *ppos) | |
1268 | { | |
1269 | return 0; | |
1270 | } | |
1271 | #endif /* CONFIG_DEBUG_FS */ | |
1272 | ||
828c0950 | 1273 | static const struct file_operations o2hb_debug_fops = { |
87d3d3f3 SM |
1274 | .open = o2hb_debug_open, |
1275 | .release = o2hb_debug_release, | |
1276 | .read = o2hb_debug_read, | |
1277 | .llseek = generic_file_llseek, | |
1278 | }; | |
1279 | ||
1280 | void o2hb_exit(void) | |
1281 | { | |
8ca8b0bb | 1282 | kfree(o2hb_db_livenodes); |
a6de0136 SM |
1283 | kfree(o2hb_db_liveregions); |
1284 | kfree(o2hb_db_quorumregions); | |
1285 | kfree(o2hb_db_failedregions); | |
1286 | debugfs_remove(o2hb_debug_failedregions); | |
1287 | debugfs_remove(o2hb_debug_quorumregions); | |
1288 | debugfs_remove(o2hb_debug_liveregions); | |
8ca8b0bb SM |
1289 | debugfs_remove(o2hb_debug_livenodes); |
1290 | debugfs_remove(o2hb_debug_dir); | |
1291 | } | |
1292 | ||
1293 | static struct dentry *o2hb_debug_create(const char *name, struct dentry *dir, | |
1294 | struct o2hb_debug_buf **db, int db_len, | |
1295 | int type, int size, int len, void *data) | |
1296 | { | |
1297 | *db = kmalloc(db_len, GFP_KERNEL); | |
1298 | if (!*db) | |
1299 | return NULL; | |
1300 | ||
1301 | (*db)->db_type = type; | |
1302 | (*db)->db_size = size; | |
1303 | (*db)->db_len = len; | |
1304 | (*db)->db_data = data; | |
1305 | ||
1306 | return debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db, | |
1307 | &o2hb_debug_fops); | |
1308 | } | |
1309 | ||
1310 | static int o2hb_debug_init(void) | |
1311 | { | |
1312 | int ret = -ENOMEM; | |
1313 | ||
1314 | o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL); | |
1315 | if (!o2hb_debug_dir) { | |
1316 | mlog_errno(ret); | |
1317 | goto bail; | |
1318 | } | |
1319 | ||
1320 | o2hb_debug_livenodes = o2hb_debug_create(O2HB_DEBUG_LIVENODES, | |
1321 | o2hb_debug_dir, | |
1322 | &o2hb_db_livenodes, | |
1323 | sizeof(*o2hb_db_livenodes), | |
1324 | O2HB_DB_TYPE_LIVENODES, | |
1325 | sizeof(o2hb_live_node_bitmap), | |
1326 | O2NM_MAX_NODES, | |
1327 | o2hb_live_node_bitmap); | |
1328 | if (!o2hb_debug_livenodes) { | |
1329 | mlog_errno(ret); | |
1330 | goto bail; | |
1331 | } | |
a6de0136 SM |
1332 | |
1333 | o2hb_debug_liveregions = o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS, | |
1334 | o2hb_debug_dir, | |
1335 | &o2hb_db_liveregions, | |
1336 | sizeof(*o2hb_db_liveregions), | |
1337 | O2HB_DB_TYPE_LIVEREGIONS, | |
1338 | sizeof(o2hb_live_region_bitmap), | |
1339 | O2NM_MAX_REGIONS, | |
1340 | o2hb_live_region_bitmap); | |
1341 | if (!o2hb_debug_liveregions) { | |
1342 | mlog_errno(ret); | |
1343 | goto bail; | |
1344 | } | |
1345 | ||
1346 | o2hb_debug_quorumregions = | |
1347 | o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS, | |
1348 | o2hb_debug_dir, | |
1349 | &o2hb_db_quorumregions, | |
1350 | sizeof(*o2hb_db_quorumregions), | |
1351 | O2HB_DB_TYPE_QUORUMREGIONS, | |
1352 | sizeof(o2hb_quorum_region_bitmap), | |
1353 | O2NM_MAX_REGIONS, | |
1354 | o2hb_quorum_region_bitmap); | |
1355 | if (!o2hb_debug_quorumregions) { | |
1356 | mlog_errno(ret); | |
1357 | goto bail; | |
1358 | } | |
1359 | ||
1360 | o2hb_debug_failedregions = | |
1361 | o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS, | |
1362 | o2hb_debug_dir, | |
1363 | &o2hb_db_failedregions, | |
1364 | sizeof(*o2hb_db_failedregions), | |
1365 | O2HB_DB_TYPE_FAILEDREGIONS, | |
1366 | sizeof(o2hb_failed_region_bitmap), | |
1367 | O2NM_MAX_REGIONS, | |
1368 | o2hb_failed_region_bitmap); | |
1369 | if (!o2hb_debug_failedregions) { | |
1370 | mlog_errno(ret); | |
1371 | goto bail; | |
1372 | } | |
1373 | ||
8ca8b0bb SM |
1374 | ret = 0; |
1375 | bail: | |
1376 | if (ret) | |
1377 | o2hb_exit(); | |
1378 | ||
1379 | return ret; | |
87d3d3f3 SM |
1380 | } |
1381 | ||
1382 | int o2hb_init(void) | |
a7f6a5fb MF |
1383 | { |
1384 | int i; | |
1385 | ||
1386 | for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) | |
1387 | INIT_LIST_HEAD(&o2hb_callbacks[i].list); | |
1388 | ||
1389 | for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) | |
1390 | INIT_LIST_HEAD(&o2hb_live_slots[i]); | |
1391 | ||
1392 | INIT_LIST_HEAD(&o2hb_node_events); | |
1393 | ||
1394 | memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap)); | |
536f0741 | 1395 | memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap)); |
e7d656ba | 1396 | memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap)); |
43182d2a | 1397 | memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap)); |
b1c5ebfb | 1398 | memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap)); |
87d3d3f3 | 1399 | |
58a3158a SM |
1400 | o2hb_dependent_users = 0; |
1401 | ||
8ca8b0bb | 1402 | return o2hb_debug_init(); |
a7f6a5fb MF |
1403 | } |
1404 | ||
1405 | /* if we're already in a callback then we're already serialized by the sem */ | |
1406 | static void o2hb_fill_node_map_from_callback(unsigned long *map, | |
1407 | unsigned bytes) | |
1408 | { | |
1409 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); | |
1410 | ||
1411 | memcpy(map, &o2hb_live_node_bitmap, bytes); | |
1412 | } | |
1413 | ||
1414 | /* | |
1415 | * get a map of all nodes that are heartbeating in any regions | |
1416 | */ | |
1417 | void o2hb_fill_node_map(unsigned long *map, unsigned bytes) | |
1418 | { | |
1419 | /* callers want to serialize this map and callbacks so that they | |
1420 | * can trust that they don't miss nodes coming to the party */ | |
1421 | down_read(&o2hb_callback_sem); | |
1422 | spin_lock(&o2hb_live_lock); | |
1423 | o2hb_fill_node_map_from_callback(map, bytes); | |
1424 | spin_unlock(&o2hb_live_lock); | |
1425 | up_read(&o2hb_callback_sem); | |
1426 | } | |
1427 | EXPORT_SYMBOL_GPL(o2hb_fill_node_map); | |
1428 | ||
1429 | /* | |
1430 | * heartbeat configfs bits. The heartbeat set is a default set under | |
1431 | * the cluster set in nodemanager.c. | |
1432 | */ | |
1433 | ||
1434 | static struct o2hb_region *to_o2hb_region(struct config_item *item) | |
1435 | { | |
1436 | return item ? container_of(item, struct o2hb_region, hr_item) : NULL; | |
1437 | } | |
1438 | ||
1439 | /* drop_item only drops its ref after killing the thread, nothing should | |
1440 | * be using the region anymore. this has to clean up any state that | |
1441 | * attributes might have built up. */ | |
1442 | static void o2hb_region_release(struct config_item *item) | |
1443 | { | |
1444 | int i; | |
1445 | struct page *page; | |
1446 | struct o2hb_region *reg = to_o2hb_region(item); | |
1447 | ||
d2eece37 SM |
1448 | mlog(ML_HEARTBEAT, "hb region release (%s)\n", reg->hr_dev_name); |
1449 | ||
d787ab09 | 1450 | kfree(reg->hr_tmp_block); |
a7f6a5fb MF |
1451 | |
1452 | if (reg->hr_slot_data) { | |
1453 | for (i = 0; i < reg->hr_num_pages; i++) { | |
1454 | page = reg->hr_slot_data[i]; | |
1455 | if (page) | |
1456 | __free_page(page); | |
1457 | } | |
1458 | kfree(reg->hr_slot_data); | |
1459 | } | |
1460 | ||
1461 | if (reg->hr_bdev) | |
9a1c3542 | 1462 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb | 1463 | |
d787ab09 | 1464 | kfree(reg->hr_slots); |
a7f6a5fb | 1465 | |
1f285305 SM |
1466 | kfree(reg->hr_db_regnum); |
1467 | kfree(reg->hr_db_livenodes); | |
1468 | debugfs_remove(reg->hr_debug_livenodes); | |
1469 | debugfs_remove(reg->hr_debug_regnum); | |
d4396eaf | 1470 | debugfs_remove(reg->hr_debug_elapsed_time); |
cb0586bd | 1471 | debugfs_remove(reg->hr_debug_pinned); |
1f285305 SM |
1472 | debugfs_remove(reg->hr_debug_dir); |
1473 | ||
a7f6a5fb MF |
1474 | spin_lock(&o2hb_live_lock); |
1475 | list_del(®->hr_all_item); | |
1476 | spin_unlock(&o2hb_live_lock); | |
1477 | ||
1478 | kfree(reg); | |
1479 | } | |
1480 | ||
1481 | static int o2hb_read_block_input(struct o2hb_region *reg, | |
1482 | const char *page, | |
1483 | size_t count, | |
1484 | unsigned long *ret_bytes, | |
1485 | unsigned int *ret_bits) | |
1486 | { | |
1487 | unsigned long bytes; | |
1488 | char *p = (char *)page; | |
1489 | ||
1490 | bytes = simple_strtoul(p, &p, 0); | |
1491 | if (!p || (*p && (*p != '\n'))) | |
1492 | return -EINVAL; | |
1493 | ||
1494 | /* Heartbeat and fs min / max block sizes are the same. */ | |
1495 | if (bytes > 4096 || bytes < 512) | |
1496 | return -ERANGE; | |
1497 | if (hweight16(bytes) != 1) | |
1498 | return -EINVAL; | |
1499 | ||
1500 | if (ret_bytes) | |
1501 | *ret_bytes = bytes; | |
1502 | if (ret_bits) | |
1503 | *ret_bits = ffs(bytes) - 1; | |
1504 | ||
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | static ssize_t o2hb_region_block_bytes_read(struct o2hb_region *reg, | |
1509 | char *page) | |
1510 | { | |
1511 | return sprintf(page, "%u\n", reg->hr_block_bytes); | |
1512 | } | |
1513 | ||
1514 | static ssize_t o2hb_region_block_bytes_write(struct o2hb_region *reg, | |
1515 | const char *page, | |
1516 | size_t count) | |
1517 | { | |
1518 | int status; | |
1519 | unsigned long block_bytes; | |
1520 | unsigned int block_bits; | |
1521 | ||
1522 | if (reg->hr_bdev) | |
1523 | return -EINVAL; | |
1524 | ||
1525 | status = o2hb_read_block_input(reg, page, count, | |
1526 | &block_bytes, &block_bits); | |
1527 | if (status) | |
1528 | return status; | |
1529 | ||
1530 | reg->hr_block_bytes = (unsigned int)block_bytes; | |
1531 | reg->hr_block_bits = block_bits; | |
1532 | ||
1533 | return count; | |
1534 | } | |
1535 | ||
1536 | static ssize_t o2hb_region_start_block_read(struct o2hb_region *reg, | |
1537 | char *page) | |
1538 | { | |
1539 | return sprintf(page, "%llu\n", reg->hr_start_block); | |
1540 | } | |
1541 | ||
1542 | static ssize_t o2hb_region_start_block_write(struct o2hb_region *reg, | |
1543 | const char *page, | |
1544 | size_t count) | |
1545 | { | |
1546 | unsigned long long tmp; | |
1547 | char *p = (char *)page; | |
1548 | ||
1549 | if (reg->hr_bdev) | |
1550 | return -EINVAL; | |
1551 | ||
1552 | tmp = simple_strtoull(p, &p, 0); | |
1553 | if (!p || (*p && (*p != '\n'))) | |
1554 | return -EINVAL; | |
1555 | ||
1556 | reg->hr_start_block = tmp; | |
1557 | ||
1558 | return count; | |
1559 | } | |
1560 | ||
1561 | static ssize_t o2hb_region_blocks_read(struct o2hb_region *reg, | |
1562 | char *page) | |
1563 | { | |
1564 | return sprintf(page, "%d\n", reg->hr_blocks); | |
1565 | } | |
1566 | ||
1567 | static ssize_t o2hb_region_blocks_write(struct o2hb_region *reg, | |
1568 | const char *page, | |
1569 | size_t count) | |
1570 | { | |
1571 | unsigned long tmp; | |
1572 | char *p = (char *)page; | |
1573 | ||
1574 | if (reg->hr_bdev) | |
1575 | return -EINVAL; | |
1576 | ||
1577 | tmp = simple_strtoul(p, &p, 0); | |
1578 | if (!p || (*p && (*p != '\n'))) | |
1579 | return -EINVAL; | |
1580 | ||
1581 | if (tmp > O2NM_MAX_NODES || tmp == 0) | |
1582 | return -ERANGE; | |
1583 | ||
1584 | reg->hr_blocks = (unsigned int)tmp; | |
1585 | ||
1586 | return count; | |
1587 | } | |
1588 | ||
1589 | static ssize_t o2hb_region_dev_read(struct o2hb_region *reg, | |
1590 | char *page) | |
1591 | { | |
1592 | unsigned int ret = 0; | |
1593 | ||
1594 | if (reg->hr_bdev) | |
1595 | ret = sprintf(page, "%s\n", reg->hr_dev_name); | |
1596 | ||
1597 | return ret; | |
1598 | } | |
1599 | ||
1600 | static void o2hb_init_region_params(struct o2hb_region *reg) | |
1601 | { | |
1602 | reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits; | |
1603 | reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; | |
1604 | ||
1605 | mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", | |
1606 | reg->hr_start_block, reg->hr_blocks); | |
1607 | mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", | |
1608 | reg->hr_block_bytes, reg->hr_block_bits); | |
1609 | mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); | |
1610 | mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); | |
1611 | } | |
1612 | ||
1613 | static int o2hb_map_slot_data(struct o2hb_region *reg) | |
1614 | { | |
1615 | int i, j; | |
1616 | unsigned int last_slot; | |
1617 | unsigned int spp = reg->hr_slots_per_page; | |
1618 | struct page *page; | |
1619 | char *raw; | |
1620 | struct o2hb_disk_slot *slot; | |
1621 | ||
1622 | reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); | |
1623 | if (reg->hr_tmp_block == NULL) { | |
1624 | mlog_errno(-ENOMEM); | |
1625 | return -ENOMEM; | |
1626 | } | |
1627 | ||
1628 | reg->hr_slots = kcalloc(reg->hr_blocks, | |
1629 | sizeof(struct o2hb_disk_slot), GFP_KERNEL); | |
1630 | if (reg->hr_slots == NULL) { | |
1631 | mlog_errno(-ENOMEM); | |
1632 | return -ENOMEM; | |
1633 | } | |
1634 | ||
1635 | for(i = 0; i < reg->hr_blocks; i++) { | |
1636 | slot = ®->hr_slots[i]; | |
1637 | slot->ds_node_num = i; | |
1638 | INIT_LIST_HEAD(&slot->ds_live_item); | |
1639 | slot->ds_raw_block = NULL; | |
1640 | } | |
1641 | ||
1642 | reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; | |
1643 | mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " | |
1644 | "at %u blocks per page\n", | |
1645 | reg->hr_num_pages, reg->hr_blocks, spp); | |
1646 | ||
1647 | reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), | |
1648 | GFP_KERNEL); | |
1649 | if (!reg->hr_slot_data) { | |
1650 | mlog_errno(-ENOMEM); | |
1651 | return -ENOMEM; | |
1652 | } | |
1653 | ||
1654 | for(i = 0; i < reg->hr_num_pages; i++) { | |
1655 | page = alloc_page(GFP_KERNEL); | |
1656 | if (!page) { | |
1657 | mlog_errno(-ENOMEM); | |
1658 | return -ENOMEM; | |
1659 | } | |
1660 | ||
1661 | reg->hr_slot_data[i] = page; | |
1662 | ||
1663 | last_slot = i * spp; | |
1664 | raw = page_address(page); | |
1665 | for (j = 0; | |
1666 | (j < spp) && ((j + last_slot) < reg->hr_blocks); | |
1667 | j++) { | |
1668 | BUG_ON((j + last_slot) >= reg->hr_blocks); | |
1669 | ||
1670 | slot = ®->hr_slots[j + last_slot]; | |
1671 | slot->ds_raw_block = | |
1672 | (struct o2hb_disk_heartbeat_block *) raw; | |
1673 | ||
1674 | raw += reg->hr_block_bytes; | |
1675 | } | |
1676 | } | |
1677 | ||
1678 | return 0; | |
1679 | } | |
1680 | ||
1681 | /* Read in all the slots available and populate the tracking | |
1682 | * structures so that we can start with a baseline idea of what's | |
1683 | * there. */ | |
1684 | static int o2hb_populate_slot_data(struct o2hb_region *reg) | |
1685 | { | |
1686 | int ret, i; | |
1687 | struct o2hb_disk_slot *slot; | |
1688 | struct o2hb_disk_heartbeat_block *hb_block; | |
1689 | ||
a7f6a5fb MF |
1690 | ret = o2hb_read_slots(reg, reg->hr_blocks); |
1691 | if (ret) { | |
1692 | mlog_errno(ret); | |
1693 | goto out; | |
1694 | } | |
1695 | ||
1696 | /* We only want to get an idea of the values initially in each | |
1697 | * slot, so we do no verification - o2hb_check_slot will | |
1698 | * actually determine if each configured slot is valid and | |
1699 | * whether any values have changed. */ | |
1700 | for(i = 0; i < reg->hr_blocks; i++) { | |
1701 | slot = ®->hr_slots[i]; | |
1702 | hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; | |
1703 | ||
1704 | /* Only fill the values that o2hb_check_slot uses to | |
1705 | * determine changing slots */ | |
1706 | slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); | |
1707 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
1708 | } | |
1709 | ||
1710 | out: | |
a7f6a5fb MF |
1711 | return ret; |
1712 | } | |
1713 | ||
1714 | /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */ | |
1715 | static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, | |
1716 | const char *page, | |
1717 | size_t count) | |
1718 | { | |
e6c352db | 1719 | struct task_struct *hb_task; |
a7f6a5fb MF |
1720 | long fd; |
1721 | int sectsize; | |
1722 | char *p = (char *)page; | |
2903ff01 AV |
1723 | struct fd f; |
1724 | struct inode *inode; | |
a7f6a5fb | 1725 | ssize_t ret = -EINVAL; |
76d9fc29 | 1726 | int live_threshold; |
a7f6a5fb MF |
1727 | |
1728 | if (reg->hr_bdev) | |
1729 | goto out; | |
1730 | ||
1731 | /* We can't heartbeat without having had our node number | |
1732 | * configured yet. */ | |
1733 | if (o2nm_this_node() == O2NM_MAX_NODES) | |
1734 | goto out; | |
1735 | ||
1736 | fd = simple_strtol(p, &p, 0); | |
1737 | if (!p || (*p && (*p != '\n'))) | |
1738 | goto out; | |
1739 | ||
1740 | if (fd < 0 || fd >= INT_MAX) | |
1741 | goto out; | |
1742 | ||
2903ff01 AV |
1743 | f = fdget(fd); |
1744 | if (f.file == NULL) | |
a7f6a5fb MF |
1745 | goto out; |
1746 | ||
1747 | if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || | |
1748 | reg->hr_block_bytes == 0) | |
2903ff01 | 1749 | goto out2; |
a7f6a5fb | 1750 | |
2903ff01 | 1751 | inode = igrab(f.file->f_mapping->host); |
a7f6a5fb | 1752 | if (inode == NULL) |
2903ff01 | 1753 | goto out2; |
a7f6a5fb MF |
1754 | |
1755 | if (!S_ISBLK(inode->i_mode)) | |
2903ff01 | 1756 | goto out3; |
a7f6a5fb | 1757 | |
2903ff01 | 1758 | reg->hr_bdev = I_BDEV(f.file->f_mapping->host); |
e525fd89 | 1759 | ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, NULL); |
a7f6a5fb MF |
1760 | if (ret) { |
1761 | reg->hr_bdev = NULL; | |
2903ff01 | 1762 | goto out3; |
a7f6a5fb MF |
1763 | } |
1764 | inode = NULL; | |
1765 | ||
1766 | bdevname(reg->hr_bdev, reg->hr_dev_name); | |
1767 | ||
e1defc4f | 1768 | sectsize = bdev_logical_block_size(reg->hr_bdev); |
a7f6a5fb MF |
1769 | if (sectsize != reg->hr_block_bytes) { |
1770 | mlog(ML_ERROR, | |
1771 | "blocksize %u incorrect for device, expected %d", | |
1772 | reg->hr_block_bytes, sectsize); | |
1773 | ret = -EINVAL; | |
2903ff01 | 1774 | goto out3; |
a7f6a5fb MF |
1775 | } |
1776 | ||
1777 | o2hb_init_region_params(reg); | |
1778 | ||
1779 | /* Generation of zero is invalid */ | |
1780 | do { | |
1781 | get_random_bytes(®->hr_generation, | |
1782 | sizeof(reg->hr_generation)); | |
1783 | } while (reg->hr_generation == 0); | |
1784 | ||
1785 | ret = o2hb_map_slot_data(reg); | |
1786 | if (ret) { | |
1787 | mlog_errno(ret); | |
2903ff01 | 1788 | goto out3; |
a7f6a5fb MF |
1789 | } |
1790 | ||
1791 | ret = o2hb_populate_slot_data(reg); | |
1792 | if (ret) { | |
1793 | mlog_errno(ret); | |
2903ff01 | 1794 | goto out3; |
a7f6a5fb MF |
1795 | } |
1796 | ||
c4028958 | 1797 | INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout); |
a7f6a5fb MF |
1798 | |
1799 | /* | |
1800 | * A node is considered live after it has beat LIVE_THRESHOLD | |
1801 | * times. We're not steady until we've given them a chance | |
1802 | * _after_ our first read. | |
76d9fc29 SM |
1803 | * The default threshold is bare minimum so as to limit the delay |
1804 | * during mounts. For global heartbeat, the threshold doubled for the | |
1805 | * first region. | |
a7f6a5fb | 1806 | */ |
76d9fc29 SM |
1807 | live_threshold = O2HB_LIVE_THRESHOLD; |
1808 | if (o2hb_global_heartbeat_active()) { | |
1809 | spin_lock(&o2hb_live_lock); | |
a8f70de3 | 1810 | if (bitmap_weight(o2hb_region_bitmap, O2NM_MAX_REGIONS) == 1) |
76d9fc29 SM |
1811 | live_threshold <<= 1; |
1812 | spin_unlock(&o2hb_live_lock); | |
1813 | } | |
d2eece37 SM |
1814 | ++live_threshold; |
1815 | atomic_set(®->hr_steady_iterations, live_threshold); | |
1816 | /* unsteady_iterations is double the steady_iterations */ | |
1817 | atomic_set(®->hr_unsteady_iterations, (live_threshold << 1)); | |
a7f6a5fb | 1818 | |
e6c352db JB |
1819 | hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s", |
1820 | reg->hr_item.ci_name); | |
1821 | if (IS_ERR(hb_task)) { | |
1822 | ret = PTR_ERR(hb_task); | |
a7f6a5fb | 1823 | mlog_errno(ret); |
2903ff01 | 1824 | goto out3; |
a7f6a5fb MF |
1825 | } |
1826 | ||
e6c352db JB |
1827 | spin_lock(&o2hb_live_lock); |
1828 | reg->hr_task = hb_task; | |
1829 | spin_unlock(&o2hb_live_lock); | |
1830 | ||
a7f6a5fb MF |
1831 | ret = wait_event_interruptible(o2hb_steady_queue, |
1832 | atomic_read(®->hr_steady_iterations) == 0); | |
1833 | if (ret) { | |
d2eece37 SM |
1834 | atomic_set(®->hr_steady_iterations, 0); |
1835 | reg->hr_aborted_start = 1; | |
1836 | } | |
e6c352db | 1837 | |
d2eece37 SM |
1838 | if (reg->hr_aborted_start) { |
1839 | ret = -EIO; | |
2903ff01 | 1840 | goto out3; |
a7f6a5fb MF |
1841 | } |
1842 | ||
e6df3a66 JB |
1843 | /* Ok, we were woken. Make sure it wasn't by drop_item() */ |
1844 | spin_lock(&o2hb_live_lock); | |
1845 | hb_task = reg->hr_task; | |
e7d656ba SM |
1846 | if (o2hb_global_heartbeat_active()) |
1847 | set_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
e6df3a66 JB |
1848 | spin_unlock(&o2hb_live_lock); |
1849 | ||
1850 | if (hb_task) | |
1851 | ret = count; | |
1852 | else | |
1853 | ret = -EIO; | |
1854 | ||
18c50cb0 | 1855 | if (hb_task && o2hb_global_heartbeat_active()) |
d2eece37 SM |
1856 | printk(KERN_NOTICE "o2hb: Heartbeat started on region %s (%s)\n", |
1857 | config_item_name(®->hr_item), reg->hr_dev_name); | |
18c50cb0 | 1858 | |
2903ff01 AV |
1859 | out3: |
1860 | iput(inode); | |
1861 | out2: | |
1862 | fdput(f); | |
a7f6a5fb | 1863 | out: |
a7f6a5fb MF |
1864 | if (ret < 0) { |
1865 | if (reg->hr_bdev) { | |
9a1c3542 | 1866 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
1867 | reg->hr_bdev = NULL; |
1868 | } | |
1869 | } | |
1870 | return ret; | |
1871 | } | |
1872 | ||
92efc152 ZW |
1873 | static ssize_t o2hb_region_pid_read(struct o2hb_region *reg, |
1874 | char *page) | |
1875 | { | |
e6c352db JB |
1876 | pid_t pid = 0; |
1877 | ||
1878 | spin_lock(&o2hb_live_lock); | |
1879 | if (reg->hr_task) | |
ba25f9dc | 1880 | pid = task_pid_nr(reg->hr_task); |
e6c352db JB |
1881 | spin_unlock(&o2hb_live_lock); |
1882 | ||
1883 | if (!pid) | |
92efc152 ZW |
1884 | return 0; |
1885 | ||
e6c352db | 1886 | return sprintf(page, "%u\n", pid); |
92efc152 ZW |
1887 | } |
1888 | ||
a7f6a5fb MF |
1889 | struct o2hb_region_attribute { |
1890 | struct configfs_attribute attr; | |
1891 | ssize_t (*show)(struct o2hb_region *, char *); | |
1892 | ssize_t (*store)(struct o2hb_region *, const char *, size_t); | |
1893 | }; | |
1894 | ||
1895 | static struct o2hb_region_attribute o2hb_region_attr_block_bytes = { | |
1896 | .attr = { .ca_owner = THIS_MODULE, | |
1897 | .ca_name = "block_bytes", | |
1898 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1899 | .show = o2hb_region_block_bytes_read, | |
1900 | .store = o2hb_region_block_bytes_write, | |
1901 | }; | |
1902 | ||
1903 | static struct o2hb_region_attribute o2hb_region_attr_start_block = { | |
1904 | .attr = { .ca_owner = THIS_MODULE, | |
1905 | .ca_name = "start_block", | |
1906 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1907 | .show = o2hb_region_start_block_read, | |
1908 | .store = o2hb_region_start_block_write, | |
1909 | }; | |
1910 | ||
1911 | static struct o2hb_region_attribute o2hb_region_attr_blocks = { | |
1912 | .attr = { .ca_owner = THIS_MODULE, | |
1913 | .ca_name = "blocks", | |
1914 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1915 | .show = o2hb_region_blocks_read, | |
1916 | .store = o2hb_region_blocks_write, | |
1917 | }; | |
1918 | ||
1919 | static struct o2hb_region_attribute o2hb_region_attr_dev = { | |
1920 | .attr = { .ca_owner = THIS_MODULE, | |
1921 | .ca_name = "dev", | |
1922 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1923 | .show = o2hb_region_dev_read, | |
1924 | .store = o2hb_region_dev_write, | |
1925 | }; | |
1926 | ||
92efc152 ZW |
1927 | static struct o2hb_region_attribute o2hb_region_attr_pid = { |
1928 | .attr = { .ca_owner = THIS_MODULE, | |
1929 | .ca_name = "pid", | |
1930 | .ca_mode = S_IRUGO | S_IRUSR }, | |
1931 | .show = o2hb_region_pid_read, | |
1932 | }; | |
1933 | ||
a7f6a5fb MF |
1934 | static struct configfs_attribute *o2hb_region_attrs[] = { |
1935 | &o2hb_region_attr_block_bytes.attr, | |
1936 | &o2hb_region_attr_start_block.attr, | |
1937 | &o2hb_region_attr_blocks.attr, | |
1938 | &o2hb_region_attr_dev.attr, | |
92efc152 | 1939 | &o2hb_region_attr_pid.attr, |
a7f6a5fb MF |
1940 | NULL, |
1941 | }; | |
1942 | ||
1943 | static ssize_t o2hb_region_show(struct config_item *item, | |
1944 | struct configfs_attribute *attr, | |
1945 | char *page) | |
1946 | { | |
1947 | struct o2hb_region *reg = to_o2hb_region(item); | |
1948 | struct o2hb_region_attribute *o2hb_region_attr = | |
1949 | container_of(attr, struct o2hb_region_attribute, attr); | |
1950 | ssize_t ret = 0; | |
1951 | ||
1952 | if (o2hb_region_attr->show) | |
1953 | ret = o2hb_region_attr->show(reg, page); | |
1954 | return ret; | |
1955 | } | |
1956 | ||
1957 | static ssize_t o2hb_region_store(struct config_item *item, | |
1958 | struct configfs_attribute *attr, | |
1959 | const char *page, size_t count) | |
1960 | { | |
1961 | struct o2hb_region *reg = to_o2hb_region(item); | |
1962 | struct o2hb_region_attribute *o2hb_region_attr = | |
1963 | container_of(attr, struct o2hb_region_attribute, attr); | |
1964 | ssize_t ret = -EINVAL; | |
1965 | ||
1966 | if (o2hb_region_attr->store) | |
1967 | ret = o2hb_region_attr->store(reg, page, count); | |
1968 | return ret; | |
1969 | } | |
1970 | ||
1971 | static struct configfs_item_operations o2hb_region_item_ops = { | |
1972 | .release = o2hb_region_release, | |
1973 | .show_attribute = o2hb_region_show, | |
1974 | .store_attribute = o2hb_region_store, | |
1975 | }; | |
1976 | ||
1977 | static struct config_item_type o2hb_region_type = { | |
1978 | .ct_item_ops = &o2hb_region_item_ops, | |
1979 | .ct_attrs = o2hb_region_attrs, | |
1980 | .ct_owner = THIS_MODULE, | |
1981 | }; | |
1982 | ||
1983 | /* heartbeat set */ | |
1984 | ||
1985 | struct o2hb_heartbeat_group { | |
1986 | struct config_group hs_group; | |
1987 | /* some stuff? */ | |
1988 | }; | |
1989 | ||
1990 | static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) | |
1991 | { | |
1992 | return group ? | |
1993 | container_of(group, struct o2hb_heartbeat_group, hs_group) | |
1994 | : NULL; | |
1995 | } | |
1996 | ||
1f285305 SM |
1997 | static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir) |
1998 | { | |
1999 | int ret = -ENOMEM; | |
2000 | ||
2001 | reg->hr_debug_dir = | |
2002 | debugfs_create_dir(config_item_name(®->hr_item), dir); | |
2003 | if (!reg->hr_debug_dir) { | |
2004 | mlog_errno(ret); | |
2005 | goto bail; | |
2006 | } | |
2007 | ||
2008 | reg->hr_debug_livenodes = | |
2009 | o2hb_debug_create(O2HB_DEBUG_LIVENODES, | |
2010 | reg->hr_debug_dir, | |
2011 | &(reg->hr_db_livenodes), | |
2012 | sizeof(*(reg->hr_db_livenodes)), | |
2013 | O2HB_DB_TYPE_REGION_LIVENODES, | |
2014 | sizeof(reg->hr_live_node_bitmap), | |
2015 | O2NM_MAX_NODES, reg); | |
2016 | if (!reg->hr_debug_livenodes) { | |
2017 | mlog_errno(ret); | |
2018 | goto bail; | |
2019 | } | |
2020 | ||
2021 | reg->hr_debug_regnum = | |
2022 | o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER, | |
2023 | reg->hr_debug_dir, | |
2024 | &(reg->hr_db_regnum), | |
2025 | sizeof(*(reg->hr_db_regnum)), | |
2026 | O2HB_DB_TYPE_REGION_NUMBER, | |
2027 | 0, O2NM_MAX_NODES, reg); | |
2028 | if (!reg->hr_debug_regnum) { | |
2029 | mlog_errno(ret); | |
2030 | goto bail; | |
2031 | } | |
2032 | ||
43695d09 SM |
2033 | reg->hr_debug_elapsed_time = |
2034 | o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME, | |
2035 | reg->hr_debug_dir, | |
2036 | &(reg->hr_db_elapsed_time), | |
2037 | sizeof(*(reg->hr_db_elapsed_time)), | |
2038 | O2HB_DB_TYPE_REGION_ELAPSED_TIME, | |
2039 | 0, 0, reg); | |
2040 | if (!reg->hr_debug_elapsed_time) { | |
2041 | mlog_errno(ret); | |
2042 | goto bail; | |
2043 | } | |
2044 | ||
cb0586bd SM |
2045 | reg->hr_debug_pinned = |
2046 | o2hb_debug_create(O2HB_DEBUG_REGION_PINNED, | |
2047 | reg->hr_debug_dir, | |
2048 | &(reg->hr_db_pinned), | |
2049 | sizeof(*(reg->hr_db_pinned)), | |
2050 | O2HB_DB_TYPE_REGION_PINNED, | |
2051 | 0, 0, reg); | |
2052 | if (!reg->hr_debug_pinned) { | |
2053 | mlog_errno(ret); | |
2054 | goto bail; | |
2055 | } | |
2056 | ||
1f285305 SM |
2057 | ret = 0; |
2058 | bail: | |
2059 | return ret; | |
2060 | } | |
2061 | ||
f89ab861 JB |
2062 | static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, |
2063 | const char *name) | |
a7f6a5fb MF |
2064 | { |
2065 | struct o2hb_region *reg = NULL; | |
1f285305 | 2066 | int ret; |
a7f6a5fb | 2067 | |
cd861280 | 2068 | reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL); |
f89ab861 | 2069 | if (reg == NULL) |
a6795e9e | 2070 | return ERR_PTR(-ENOMEM); |
a7f6a5fb | 2071 | |
1cf257f5 JS |
2072 | if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) { |
2073 | ret = -ENAMETOOLONG; | |
2074 | goto free; | |
2075 | } | |
b3c85c4c | 2076 | |
a7f6a5fb | 2077 | spin_lock(&o2hb_live_lock); |
536f0741 SM |
2078 | reg->hr_region_num = 0; |
2079 | if (o2hb_global_heartbeat_active()) { | |
2080 | reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap, | |
2081 | O2NM_MAX_REGIONS); | |
2082 | if (reg->hr_region_num >= O2NM_MAX_REGIONS) { | |
2083 | spin_unlock(&o2hb_live_lock); | |
1cf257f5 JS |
2084 | ret = -EFBIG; |
2085 | goto free; | |
536f0741 SM |
2086 | } |
2087 | set_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2088 | } | |
a7f6a5fb MF |
2089 | list_add_tail(®->hr_all_item, &o2hb_all_regions); |
2090 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb | 2091 | |
536f0741 SM |
2092 | config_item_init_type_name(®->hr_item, name, &o2hb_region_type); |
2093 | ||
1f285305 SM |
2094 | ret = o2hb_debug_region_init(reg, o2hb_debug_dir); |
2095 | if (ret) { | |
2096 | config_item_put(®->hr_item); | |
1cf257f5 | 2097 | goto free; |
1f285305 SM |
2098 | } |
2099 | ||
a6795e9e | 2100 | return ®->hr_item; |
1cf257f5 JS |
2101 | free: |
2102 | kfree(reg); | |
2103 | return ERR_PTR(ret); | |
a7f6a5fb MF |
2104 | } |
2105 | ||
2106 | static void o2hb_heartbeat_group_drop_item(struct config_group *group, | |
2107 | struct config_item *item) | |
2108 | { | |
e6c352db | 2109 | struct task_struct *hb_task; |
a7f6a5fb | 2110 | struct o2hb_region *reg = to_o2hb_region(item); |
58a3158a | 2111 | int quorum_region = 0; |
a7f6a5fb MF |
2112 | |
2113 | /* stop the thread when the user removes the region dir */ | |
e6c352db JB |
2114 | spin_lock(&o2hb_live_lock); |
2115 | hb_task = reg->hr_task; | |
2116 | reg->hr_task = NULL; | |
58a3158a | 2117 | reg->hr_item_dropped = 1; |
e6c352db JB |
2118 | spin_unlock(&o2hb_live_lock); |
2119 | ||
2120 | if (hb_task) | |
2121 | kthread_stop(hb_task); | |
a7f6a5fb | 2122 | |
d2eece37 SM |
2123 | if (o2hb_global_heartbeat_active()) { |
2124 | spin_lock(&o2hb_live_lock); | |
2125 | clear_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2126 | clear_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
2127 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
2128 | quorum_region = 1; | |
2129 | clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
2130 | spin_unlock(&o2hb_live_lock); | |
2131 | printk(KERN_NOTICE "o2hb: Heartbeat %s on region %s (%s)\n", | |
2132 | ((atomic_read(®->hr_steady_iterations) == 0) ? | |
2133 | "stopped" : "start aborted"), config_item_name(item), | |
2134 | reg->hr_dev_name); | |
2135 | } | |
2136 | ||
e6df3a66 JB |
2137 | /* |
2138 | * If we're racing a dev_write(), we need to wake them. They will | |
2139 | * check reg->hr_task | |
2140 | */ | |
2141 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
d2eece37 | 2142 | reg->hr_aborted_start = 1; |
e6df3a66 JB |
2143 | atomic_set(®->hr_steady_iterations, 0); |
2144 | wake_up(&o2hb_steady_queue); | |
2145 | } | |
2146 | ||
a7f6a5fb | 2147 | config_item_put(item); |
58a3158a SM |
2148 | |
2149 | if (!o2hb_global_heartbeat_active() || !quorum_region) | |
2150 | return; | |
2151 | ||
2152 | /* | |
2153 | * If global heartbeat active and there are dependent users, | |
2154 | * pin all regions if quorum region count <= CUT_OFF | |
2155 | */ | |
2156 | spin_lock(&o2hb_live_lock); | |
2157 | ||
2158 | if (!o2hb_dependent_users) | |
2159 | goto unlock; | |
2160 | ||
a8f70de3 | 2161 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2162 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2163 | o2hb_region_pin(NULL); | |
2164 | ||
2165 | unlock: | |
2166 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb MF |
2167 | } |
2168 | ||
2169 | struct o2hb_heartbeat_group_attribute { | |
2170 | struct configfs_attribute attr; | |
2171 | ssize_t (*show)(struct o2hb_heartbeat_group *, char *); | |
2172 | ssize_t (*store)(struct o2hb_heartbeat_group *, const char *, size_t); | |
2173 | }; | |
2174 | ||
2175 | static ssize_t o2hb_heartbeat_group_show(struct config_item *item, | |
2176 | struct configfs_attribute *attr, | |
2177 | char *page) | |
2178 | { | |
2179 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
2180 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
2181 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
2182 | ssize_t ret = 0; | |
2183 | ||
2184 | if (o2hb_heartbeat_group_attr->show) | |
2185 | ret = o2hb_heartbeat_group_attr->show(reg, page); | |
2186 | return ret; | |
2187 | } | |
2188 | ||
2189 | static ssize_t o2hb_heartbeat_group_store(struct config_item *item, | |
2190 | struct configfs_attribute *attr, | |
2191 | const char *page, size_t count) | |
2192 | { | |
2193 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
2194 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
2195 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
2196 | ssize_t ret = -EINVAL; | |
2197 | ||
2198 | if (o2hb_heartbeat_group_attr->store) | |
2199 | ret = o2hb_heartbeat_group_attr->store(reg, page, count); | |
2200 | return ret; | |
2201 | } | |
2202 | ||
2203 | static ssize_t o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group *group, | |
2204 | char *page) | |
2205 | { | |
2206 | return sprintf(page, "%u\n", o2hb_dead_threshold); | |
2207 | } | |
2208 | ||
2209 | static ssize_t o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group *group, | |
2210 | const char *page, | |
2211 | size_t count) | |
2212 | { | |
2213 | unsigned long tmp; | |
2214 | char *p = (char *)page; | |
2215 | ||
2216 | tmp = simple_strtoul(p, &p, 10); | |
2217 | if (!p || (*p && (*p != '\n'))) | |
2218 | return -EINVAL; | |
2219 | ||
2220 | /* this will validate ranges for us. */ | |
2221 | o2hb_dead_threshold_set((unsigned int) tmp); | |
2222 | ||
2223 | return count; | |
2224 | } | |
2225 | ||
54b5187b SM |
2226 | static |
2227 | ssize_t o2hb_heartbeat_group_mode_show(struct o2hb_heartbeat_group *group, | |
2228 | char *page) | |
2229 | { | |
2230 | return sprintf(page, "%s\n", | |
2231 | o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]); | |
2232 | } | |
2233 | ||
2234 | static | |
2235 | ssize_t o2hb_heartbeat_group_mode_store(struct o2hb_heartbeat_group *group, | |
2236 | const char *page, size_t count) | |
2237 | { | |
2238 | unsigned int i; | |
2239 | int ret; | |
2240 | size_t len; | |
2241 | ||
2242 | len = (page[count - 1] == '\n') ? count - 1 : count; | |
2243 | if (!len) | |
2244 | return -EINVAL; | |
2245 | ||
2246 | for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) { | |
2247 | if (strnicmp(page, o2hb_heartbeat_mode_desc[i], len)) | |
2248 | continue; | |
2249 | ||
70f651ed | 2250 | ret = o2hb_global_heartbeat_mode_set(i); |
54b5187b | 2251 | if (!ret) |
18c50cb0 | 2252 | printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n", |
54b5187b SM |
2253 | o2hb_heartbeat_mode_desc[i]); |
2254 | return count; | |
2255 | } | |
2256 | ||
2257 | return -EINVAL; | |
2258 | ||
2259 | } | |
2260 | ||
a7f6a5fb MF |
2261 | static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold = { |
2262 | .attr = { .ca_owner = THIS_MODULE, | |
2263 | .ca_name = "dead_threshold", | |
2264 | .ca_mode = S_IRUGO | S_IWUSR }, | |
2265 | .show = o2hb_heartbeat_group_threshold_show, | |
2266 | .store = o2hb_heartbeat_group_threshold_store, | |
2267 | }; | |
2268 | ||
54b5187b SM |
2269 | static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_mode = { |
2270 | .attr = { .ca_owner = THIS_MODULE, | |
2271 | .ca_name = "mode", | |
2272 | .ca_mode = S_IRUGO | S_IWUSR }, | |
2273 | .show = o2hb_heartbeat_group_mode_show, | |
2274 | .store = o2hb_heartbeat_group_mode_store, | |
2275 | }; | |
2276 | ||
a7f6a5fb MF |
2277 | static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { |
2278 | &o2hb_heartbeat_group_attr_threshold.attr, | |
54b5187b | 2279 | &o2hb_heartbeat_group_attr_mode.attr, |
a7f6a5fb MF |
2280 | NULL, |
2281 | }; | |
2282 | ||
70f651ed | 2283 | static struct configfs_item_operations o2hb_heartbeat_group_item_ops = { |
a7f6a5fb MF |
2284 | .show_attribute = o2hb_heartbeat_group_show, |
2285 | .store_attribute = o2hb_heartbeat_group_store, | |
2286 | }; | |
2287 | ||
2288 | static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { | |
2289 | .make_item = o2hb_heartbeat_group_make_item, | |
2290 | .drop_item = o2hb_heartbeat_group_drop_item, | |
2291 | }; | |
2292 | ||
2293 | static struct config_item_type o2hb_heartbeat_group_type = { | |
2294 | .ct_group_ops = &o2hb_heartbeat_group_group_ops, | |
70f651ed | 2295 | .ct_item_ops = &o2hb_heartbeat_group_item_ops, |
a7f6a5fb MF |
2296 | .ct_attrs = o2hb_heartbeat_group_attrs, |
2297 | .ct_owner = THIS_MODULE, | |
2298 | }; | |
2299 | ||
2300 | /* this is just here to avoid touching group in heartbeat.h which the | |
2301 | * entire damn world #includes */ | |
2302 | struct config_group *o2hb_alloc_hb_set(void) | |
2303 | { | |
2304 | struct o2hb_heartbeat_group *hs = NULL; | |
2305 | struct config_group *ret = NULL; | |
2306 | ||
cd861280 | 2307 | hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); |
a7f6a5fb MF |
2308 | if (hs == NULL) |
2309 | goto out; | |
2310 | ||
2311 | config_group_init_type_name(&hs->hs_group, "heartbeat", | |
2312 | &o2hb_heartbeat_group_type); | |
2313 | ||
2314 | ret = &hs->hs_group; | |
2315 | out: | |
2316 | if (ret == NULL) | |
2317 | kfree(hs); | |
2318 | return ret; | |
2319 | } | |
2320 | ||
2321 | void o2hb_free_hb_set(struct config_group *group) | |
2322 | { | |
2323 | struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); | |
2324 | kfree(hs); | |
2325 | } | |
2326 | ||
25985edc | 2327 | /* hb callback registration and issuing */ |
a7f6a5fb MF |
2328 | |
2329 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) | |
2330 | { | |
2331 | if (type == O2HB_NUM_CB) | |
2332 | return ERR_PTR(-EINVAL); | |
2333 | ||
2334 | return &o2hb_callbacks[type]; | |
2335 | } | |
2336 | ||
2337 | void o2hb_setup_callback(struct o2hb_callback_func *hc, | |
2338 | enum o2hb_callback_type type, | |
2339 | o2hb_cb_func *func, | |
2340 | void *data, | |
2341 | int priority) | |
2342 | { | |
2343 | INIT_LIST_HEAD(&hc->hc_item); | |
2344 | hc->hc_func = func; | |
2345 | hc->hc_data = data; | |
2346 | hc->hc_priority = priority; | |
2347 | hc->hc_type = type; | |
2348 | hc->hc_magic = O2HB_CB_MAGIC; | |
2349 | } | |
2350 | EXPORT_SYMBOL_GPL(o2hb_setup_callback); | |
2351 | ||
58a3158a SM |
2352 | /* |
2353 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2354 | * In global heartbeat mode, region_uuid passed is NULL. | |
2355 | * | |
2356 | * In local, we only pin the matching region. In global we pin all the active | |
2357 | * regions. | |
2358 | */ | |
2359 | static int o2hb_region_pin(const char *region_uuid) | |
14829422 | 2360 | { |
58a3158a SM |
2361 | int ret = 0, found = 0; |
2362 | struct o2hb_region *reg; | |
2363 | char *uuid; | |
14829422 JB |
2364 | |
2365 | assert_spin_locked(&o2hb_live_lock); | |
2366 | ||
58a3158a | 2367 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2368 | if (reg->hr_item_dropped) |
2369 | continue; | |
2370 | ||
58a3158a SM |
2371 | uuid = config_item_name(®->hr_item); |
2372 | ||
2373 | /* local heartbeat */ | |
2374 | if (region_uuid) { | |
2375 | if (strcmp(region_uuid, uuid)) | |
2376 | continue; | |
2377 | found = 1; | |
14829422 | 2378 | } |
58a3158a SM |
2379 | |
2380 | if (reg->hr_item_pinned || reg->hr_item_dropped) | |
2381 | goto skip_pin; | |
2382 | ||
2383 | /* Ignore ENOENT only for local hb (userdlm domain) */ | |
2384 | ret = o2nm_depend_item(®->hr_item); | |
2385 | if (!ret) { | |
2386 | mlog(ML_CLUSTER, "Pin region %s\n", uuid); | |
2387 | reg->hr_item_pinned = 1; | |
2388 | } else { | |
2389 | if (ret == -ENOENT && found) | |
2390 | ret = 0; | |
2391 | else { | |
2392 | mlog(ML_ERROR, "Pin region %s fails with %d\n", | |
2393 | uuid, ret); | |
2394 | break; | |
2395 | } | |
14829422 | 2396 | } |
58a3158a SM |
2397 | skip_pin: |
2398 | if (found) | |
2399 | break; | |
14829422 JB |
2400 | } |
2401 | ||
58a3158a | 2402 | return ret; |
14829422 JB |
2403 | } |
2404 | ||
58a3158a SM |
2405 | /* |
2406 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2407 | * In global heartbeat mode, region_uuid passed is NULL. | |
2408 | * | |
2409 | * In local, we only unpin the matching region. In global we unpin all the | |
2410 | * active regions. | |
2411 | */ | |
2412 | static void o2hb_region_unpin(const char *region_uuid) | |
14829422 | 2413 | { |
14829422 | 2414 | struct o2hb_region *reg; |
58a3158a SM |
2415 | char *uuid; |
2416 | int found = 0; | |
14829422 | 2417 | |
58a3158a | 2418 | assert_spin_locked(&o2hb_live_lock); |
14829422 | 2419 | |
58a3158a | 2420 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2421 | if (reg->hr_item_dropped) |
2422 | continue; | |
2423 | ||
58a3158a SM |
2424 | uuid = config_item_name(®->hr_item); |
2425 | if (region_uuid) { | |
2426 | if (strcmp(region_uuid, uuid)) | |
2427 | continue; | |
2428 | found = 1; | |
2429 | } | |
14829422 | 2430 | |
58a3158a SM |
2431 | if (reg->hr_item_pinned) { |
2432 | mlog(ML_CLUSTER, "Unpin region %s\n", uuid); | |
2433 | o2nm_undepend_item(®->hr_item); | |
2434 | reg->hr_item_pinned = 0; | |
2435 | } | |
2436 | if (found) | |
2437 | break; | |
2438 | } | |
2439 | } | |
16c6a4f2 | 2440 | |
58a3158a SM |
2441 | static int o2hb_region_inc_user(const char *region_uuid) |
2442 | { | |
2443 | int ret = 0; | |
14829422 | 2444 | |
58a3158a | 2445 | spin_lock(&o2hb_live_lock); |
16c6a4f2 | 2446 | |
58a3158a SM |
2447 | /* local heartbeat */ |
2448 | if (!o2hb_global_heartbeat_active()) { | |
2449 | ret = o2hb_region_pin(region_uuid); | |
2450 | goto unlock; | |
2451 | } | |
2452 | ||
2453 | /* | |
2454 | * if global heartbeat active and this is the first dependent user, | |
2455 | * pin all regions if quorum region count <= CUT_OFF | |
2456 | */ | |
2457 | o2hb_dependent_users++; | |
2458 | if (o2hb_dependent_users > 1) | |
2459 | goto unlock; | |
2460 | ||
a8f70de3 | 2461 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2462 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2463 | ret = o2hb_region_pin(NULL); | |
2464 | ||
2465 | unlock: | |
2466 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2467 | return ret; |
2468 | } | |
2469 | ||
58a3158a | 2470 | void o2hb_region_dec_user(const char *region_uuid) |
14829422 | 2471 | { |
14829422 JB |
2472 | spin_lock(&o2hb_live_lock); |
2473 | ||
58a3158a SM |
2474 | /* local heartbeat */ |
2475 | if (!o2hb_global_heartbeat_active()) { | |
2476 | o2hb_region_unpin(region_uuid); | |
2477 | goto unlock; | |
2478 | } | |
14829422 | 2479 | |
58a3158a SM |
2480 | /* |
2481 | * if global heartbeat active and there are no dependent users, | |
2482 | * unpin all quorum regions | |
2483 | */ | |
2484 | o2hb_dependent_users--; | |
2485 | if (!o2hb_dependent_users) | |
2486 | o2hb_region_unpin(NULL); | |
14829422 | 2487 | |
58a3158a SM |
2488 | unlock: |
2489 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2490 | } |
2491 | ||
2492 | int o2hb_register_callback(const char *region_uuid, | |
2493 | struct o2hb_callback_func *hc) | |
a7f6a5fb | 2494 | { |
df53cd3b | 2495 | struct o2hb_callback_func *f; |
a7f6a5fb MF |
2496 | struct o2hb_callback *hbcall; |
2497 | int ret; | |
2498 | ||
2499 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2500 | BUG_ON(!list_empty(&hc->hc_item)); | |
2501 | ||
2502 | hbcall = hbcall_from_type(hc->hc_type); | |
2503 | if (IS_ERR(hbcall)) { | |
2504 | ret = PTR_ERR(hbcall); | |
2505 | goto out; | |
2506 | } | |
2507 | ||
14829422 | 2508 | if (region_uuid) { |
58a3158a SM |
2509 | ret = o2hb_region_inc_user(region_uuid); |
2510 | if (ret) { | |
2511 | mlog_errno(ret); | |
14829422 | 2512 | goto out; |
58a3158a | 2513 | } |
14829422 JB |
2514 | } |
2515 | ||
a7f6a5fb MF |
2516 | down_write(&o2hb_callback_sem); |
2517 | ||
df53cd3b DF |
2518 | list_for_each_entry(f, &hbcall->list, hc_item) { |
2519 | if (hc->hc_priority < f->hc_priority) { | |
2520 | list_add_tail(&hc->hc_item, &f->hc_item); | |
a7f6a5fb MF |
2521 | break; |
2522 | } | |
2523 | } | |
2524 | if (list_empty(&hc->hc_item)) | |
2525 | list_add_tail(&hc->hc_item, &hbcall->list); | |
2526 | ||
2527 | up_write(&o2hb_callback_sem); | |
2528 | ret = 0; | |
2529 | out: | |
58a3158a | 2530 | mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2531 | ret, __builtin_return_address(0), hc); |
2532 | return ret; | |
2533 | } | |
2534 | EXPORT_SYMBOL_GPL(o2hb_register_callback); | |
2535 | ||
14829422 JB |
2536 | void o2hb_unregister_callback(const char *region_uuid, |
2537 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
2538 | { |
2539 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2540 | ||
58a3158a | 2541 | mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2542 | __builtin_return_address(0), hc); |
2543 | ||
14829422 | 2544 | /* XXX Can this happen _with_ a region reference? */ |
a7f6a5fb | 2545 | if (list_empty(&hc->hc_item)) |
c24f72cc | 2546 | return; |
a7f6a5fb | 2547 | |
14829422 | 2548 | if (region_uuid) |
58a3158a | 2549 | o2hb_region_dec_user(region_uuid); |
14829422 | 2550 | |
a7f6a5fb MF |
2551 | down_write(&o2hb_callback_sem); |
2552 | ||
2553 | list_del_init(&hc->hc_item); | |
2554 | ||
2555 | up_write(&o2hb_callback_sem); | |
a7f6a5fb MF |
2556 | } |
2557 | EXPORT_SYMBOL_GPL(o2hb_unregister_callback); | |
2558 | ||
2559 | int o2hb_check_node_heartbeating(u8 node_num) | |
2560 | { | |
2561 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2562 | ||
2563 | o2hb_fill_node_map(testing_map, sizeof(testing_map)); | |
2564 | if (!test_bit(node_num, testing_map)) { | |
2565 | mlog(ML_HEARTBEAT, | |
2566 | "node (%u) does not have heartbeating enabled.\n", | |
2567 | node_num); | |
2568 | return 0; | |
2569 | } | |
2570 | ||
2571 | return 1; | |
2572 | } | |
2573 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating); | |
2574 | ||
2575 | int o2hb_check_node_heartbeating_from_callback(u8 node_num) | |
2576 | { | |
2577 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2578 | ||
2579 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); | |
2580 | if (!test_bit(node_num, testing_map)) { | |
2581 | mlog(ML_HEARTBEAT, | |
2582 | "node (%u) does not have heartbeating enabled.\n", | |
2583 | node_num); | |
2584 | return 0; | |
2585 | } | |
2586 | ||
2587 | return 1; | |
2588 | } | |
2589 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); | |
2590 | ||
2591 | /* Makes sure our local node is configured with a node number, and is | |
2592 | * heartbeating. */ | |
2593 | int o2hb_check_local_node_heartbeating(void) | |
2594 | { | |
2595 | u8 node_num; | |
2596 | ||
2597 | /* if this node was set then we have networking */ | |
2598 | node_num = o2nm_this_node(); | |
2599 | if (node_num == O2NM_MAX_NODES) { | |
2600 | mlog(ML_HEARTBEAT, "this node has not been configured.\n"); | |
2601 | return 0; | |
2602 | } | |
2603 | ||
2604 | return o2hb_check_node_heartbeating(node_num); | |
2605 | } | |
2606 | EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating); | |
2607 | ||
2608 | /* | |
2609 | * this is just a hack until we get the plumbing which flips file systems | |
2610 | * read only and drops the hb ref instead of killing the node dead. | |
2611 | */ | |
2612 | void o2hb_stop_all_regions(void) | |
2613 | { | |
2614 | struct o2hb_region *reg; | |
2615 | ||
2616 | mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); | |
2617 | ||
2618 | spin_lock(&o2hb_live_lock); | |
2619 | ||
2620 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) | |
2621 | reg->hr_unclean_stop = 1; | |
2622 | ||
2623 | spin_unlock(&o2hb_live_lock); | |
2624 | } | |
2625 | EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); | |
b3c85c4c SM |
2626 | |
2627 | int o2hb_get_all_regions(char *region_uuids, u8 max_regions) | |
2628 | { | |
2629 | struct o2hb_region *reg; | |
2630 | int numregs = 0; | |
2631 | char *p; | |
2632 | ||
2633 | spin_lock(&o2hb_live_lock); | |
2634 | ||
2635 | p = region_uuids; | |
2636 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { | |
4a184b4f X |
2637 | if (reg->hr_item_dropped) |
2638 | continue; | |
2639 | ||
b3c85c4c SM |
2640 | mlog(0, "Region: %s\n", config_item_name(®->hr_item)); |
2641 | if (numregs < max_regions) { | |
2642 | memcpy(p, config_item_name(®->hr_item), | |
2643 | O2HB_MAX_REGION_NAME_LEN); | |
2644 | p += O2HB_MAX_REGION_NAME_LEN; | |
2645 | } | |
2646 | numregs++; | |
2647 | } | |
2648 | ||
2649 | spin_unlock(&o2hb_live_lock); | |
2650 | ||
2651 | return numregs; | |
2652 | } | |
2653 | EXPORT_SYMBOL_GPL(o2hb_get_all_regions); | |
2654 | ||
2655 | int o2hb_global_heartbeat_active(void) | |
2656 | { | |
4d94aa1b | 2657 | return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL); |
b3c85c4c SM |
2658 | } |
2659 | EXPORT_SYMBOL(o2hb_global_heartbeat_active); |