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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> |
40476b82 | 39 | #include <linux/ktime.h> |
a7f6a5fb MF |
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 | ||
4246a0b6 | 375 | static void o2hb_bio_end_io(struct bio *bio) |
a7f6a5fb MF |
376 | { |
377 | struct o2hb_bio_wait_ctxt *wc = bio->bi_private; | |
378 | ||
4246a0b6 CH |
379 | if (bio->bi_error) { |
380 | mlog(ML_ERROR, "IO Error %d\n", bio->bi_error); | |
381 | wc->wc_error = bio->bi_error; | |
a9e2ae39 | 382 | } |
a7f6a5fb | 383 | |
a7f6a5fb | 384 | o2hb_bio_wait_dec(wc, 1); |
b559292e | 385 | bio_put(bio); |
a7f6a5fb MF |
386 | } |
387 | ||
388 | /* Setup a Bio to cover I/O against num_slots slots starting at | |
389 | * start_slot. */ | |
390 | static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, | |
391 | struct o2hb_bio_wait_ctxt *wc, | |
b559292e PR |
392 | unsigned int *current_slot, |
393 | unsigned int max_slots) | |
a7f6a5fb | 394 | { |
b559292e | 395 | int len, current_page; |
a7f6a5fb MF |
396 | unsigned int vec_len, vec_start; |
397 | unsigned int bits = reg->hr_block_bits; | |
398 | unsigned int spp = reg->hr_slots_per_page; | |
b559292e | 399 | unsigned int cs = *current_slot; |
a7f6a5fb MF |
400 | struct bio *bio; |
401 | struct page *page; | |
402 | ||
a7f6a5fb MF |
403 | /* Testing has shown this allocation to take long enough under |
404 | * GFP_KERNEL that the local node can get fenced. It would be | |
405 | * nicest if we could pre-allocate these bios and avoid this | |
406 | * all together. */ | |
b559292e | 407 | bio = bio_alloc(GFP_ATOMIC, 16); |
a7f6a5fb MF |
408 | if (!bio) { |
409 | mlog(ML_ERROR, "Could not alloc slots BIO!\n"); | |
410 | bio = ERR_PTR(-ENOMEM); | |
411 | goto bail; | |
412 | } | |
413 | ||
414 | /* Must put everything in 512 byte sectors for the bio... */ | |
4f024f37 | 415 | bio->bi_iter.bi_sector = (reg->hr_start_block + cs) << (bits - 9); |
a7f6a5fb MF |
416 | bio->bi_bdev = reg->hr_bdev; |
417 | bio->bi_private = wc; | |
418 | bio->bi_end_io = o2hb_bio_end_io; | |
419 | ||
b559292e PR |
420 | vec_start = (cs << bits) % PAGE_CACHE_SIZE; |
421 | while(cs < max_slots) { | |
422 | current_page = cs / spp; | |
423 | page = reg->hr_slot_data[current_page]; | |
a7f6a5fb | 424 | |
bc7e97cb | 425 | vec_len = min(PAGE_CACHE_SIZE - vec_start, |
b559292e | 426 | (max_slots-cs) * (PAGE_CACHE_SIZE/spp) ); |
a7f6a5fb MF |
427 | |
428 | mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", | |
b559292e | 429 | current_page, vec_len, vec_start); |
a7f6a5fb MF |
430 | |
431 | len = bio_add_page(bio, page, vec_len, vec_start); | |
b559292e | 432 | if (len != vec_len) break; |
a7f6a5fb | 433 | |
b559292e | 434 | cs += vec_len / (PAGE_CACHE_SIZE/spp); |
a7f6a5fb MF |
435 | vec_start = 0; |
436 | } | |
437 | ||
438 | bail: | |
b559292e | 439 | *current_slot = cs; |
a7f6a5fb MF |
440 | return bio; |
441 | } | |
442 | ||
a7f6a5fb MF |
443 | static int o2hb_read_slots(struct o2hb_region *reg, |
444 | unsigned int max_slots) | |
445 | { | |
b559292e PR |
446 | unsigned int current_slot=0; |
447 | int status; | |
a7f6a5fb | 448 | struct o2hb_bio_wait_ctxt wc; |
a7f6a5fb MF |
449 | struct bio *bio; |
450 | ||
b559292e | 451 | o2hb_bio_wait_init(&wc); |
a7f6a5fb | 452 | |
b559292e PR |
453 | while(current_slot < max_slots) { |
454 | bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots); | |
a7f6a5fb | 455 | if (IS_ERR(bio)) { |
a7f6a5fb MF |
456 | status = PTR_ERR(bio); |
457 | mlog_errno(status); | |
458 | goto bail_and_wait; | |
459 | } | |
a7f6a5fb | 460 | |
b559292e | 461 | atomic_inc(&wc.wc_num_reqs); |
a7f6a5fb MF |
462 | submit_bio(READ, bio); |
463 | } | |
464 | ||
465 | status = 0; | |
466 | ||
467 | bail_and_wait: | |
468 | o2hb_wait_on_io(reg, &wc); | |
a9e2ae39 MF |
469 | if (wc.wc_error && !status) |
470 | status = wc.wc_error; | |
a7f6a5fb | 471 | |
a7f6a5fb MF |
472 | return status; |
473 | } | |
474 | ||
475 | static int o2hb_issue_node_write(struct o2hb_region *reg, | |
a7f6a5fb MF |
476 | struct o2hb_bio_wait_ctxt *write_wc) |
477 | { | |
478 | int status; | |
479 | unsigned int slot; | |
480 | struct bio *bio; | |
481 | ||
b559292e | 482 | o2hb_bio_wait_init(write_wc); |
a7f6a5fb MF |
483 | |
484 | slot = o2nm_this_node(); | |
485 | ||
b559292e | 486 | bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1); |
a7f6a5fb MF |
487 | if (IS_ERR(bio)) { |
488 | status = PTR_ERR(bio); | |
489 | mlog_errno(status); | |
490 | goto bail; | |
491 | } | |
492 | ||
b559292e | 493 | atomic_inc(&write_wc->wc_num_reqs); |
e873fdb5 | 494 | submit_bio(WRITE_SYNC, bio); |
a7f6a5fb | 495 | |
a7f6a5fb MF |
496 | status = 0; |
497 | bail: | |
498 | return status; | |
499 | } | |
500 | ||
501 | static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, | |
502 | struct o2hb_disk_heartbeat_block *hb_block) | |
503 | { | |
504 | __le32 old_cksum; | |
505 | u32 ret; | |
506 | ||
507 | /* We want to compute the block crc with a 0 value in the | |
508 | * hb_cksum field. Save it off here and replace after the | |
509 | * crc. */ | |
510 | old_cksum = hb_block->hb_cksum; | |
511 | hb_block->hb_cksum = 0; | |
512 | ||
513 | ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); | |
514 | ||
515 | hb_block->hb_cksum = old_cksum; | |
516 | ||
517 | return ret; | |
518 | } | |
519 | ||
520 | static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) | |
521 | { | |
70bacbdb MF |
522 | mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, " |
523 | "cksum = 0x%x, generation 0x%llx\n", | |
524 | (long long)le64_to_cpu(hb_block->hb_seq), | |
525 | hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum), | |
526 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
527 | } |
528 | ||
529 | static int o2hb_verify_crc(struct o2hb_region *reg, | |
530 | struct o2hb_disk_heartbeat_block *hb_block) | |
531 | { | |
532 | u32 read, computed; | |
533 | ||
534 | read = le32_to_cpu(hb_block->hb_cksum); | |
535 | computed = o2hb_compute_block_crc_le(reg, hb_block); | |
536 | ||
537 | return read == computed; | |
538 | } | |
539 | ||
d2eece37 SM |
540 | /* |
541 | * Compare the slot data with what we wrote in the last iteration. | |
542 | * If the match fails, print an appropriate error message. This is to | |
543 | * detect errors like... another node hearting on the same slot, | |
544 | * flaky device that is losing writes, etc. | |
545 | * Returns 1 if check succeeds, 0 otherwise. | |
546 | */ | |
547 | static int o2hb_check_own_slot(struct o2hb_region *reg) | |
a7f6a5fb | 548 | { |
a7f6a5fb MF |
549 | struct o2hb_disk_slot *slot; |
550 | struct o2hb_disk_heartbeat_block *hb_block; | |
33c12a54 | 551 | char *errstr; |
a7f6a5fb | 552 | |
33c12a54 | 553 | slot = ®->hr_slots[o2nm_this_node()]; |
a7f6a5fb | 554 | /* Don't check on our 1st timestamp */ |
33c12a54 | 555 | if (!slot->ds_last_time) |
d2eece37 | 556 | return 0; |
a7f6a5fb | 557 | |
33c12a54 SM |
558 | hb_block = slot->ds_raw_block; |
559 | if (le64_to_cpu(hb_block->hb_seq) == slot->ds_last_time && | |
560 | le64_to_cpu(hb_block->hb_generation) == slot->ds_last_generation && | |
561 | hb_block->hb_node == slot->ds_node_num) | |
d2eece37 | 562 | return 1; |
a7f6a5fb | 563 | |
33c12a54 SM |
564 | #define ERRSTR1 "Another node is heartbeating on device" |
565 | #define ERRSTR2 "Heartbeat generation mismatch on device" | |
566 | #define ERRSTR3 "Heartbeat sequence mismatch on device" | |
567 | ||
568 | if (hb_block->hb_node != slot->ds_node_num) | |
569 | errstr = ERRSTR1; | |
570 | else if (le64_to_cpu(hb_block->hb_generation) != | |
571 | slot->ds_last_generation) | |
572 | errstr = ERRSTR2; | |
573 | else | |
574 | errstr = ERRSTR3; | |
575 | ||
576 | mlog(ML_ERROR, "%s (%s): expected(%u:0x%llx, 0x%llx), " | |
577 | "ondisk(%u:0x%llx, 0x%llx)\n", errstr, reg->hr_dev_name, | |
578 | slot->ds_node_num, (unsigned long long)slot->ds_last_generation, | |
579 | (unsigned long long)slot->ds_last_time, hb_block->hb_node, | |
580 | (unsigned long long)le64_to_cpu(hb_block->hb_generation), | |
581 | (unsigned long long)le64_to_cpu(hb_block->hb_seq)); | |
d2eece37 SM |
582 | |
583 | return 0; | |
a7f6a5fb MF |
584 | } |
585 | ||
586 | static inline void o2hb_prepare_block(struct o2hb_region *reg, | |
587 | u64 generation) | |
588 | { | |
589 | int node_num; | |
590 | u64 cputime; | |
591 | struct o2hb_disk_slot *slot; | |
592 | struct o2hb_disk_heartbeat_block *hb_block; | |
593 | ||
594 | node_num = o2nm_this_node(); | |
595 | slot = ®->hr_slots[node_num]; | |
596 | ||
597 | hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; | |
598 | memset(hb_block, 0, reg->hr_block_bytes); | |
599 | /* TODO: time stuff */ | |
600 | cputime = CURRENT_TIME.tv_sec; | |
601 | if (!cputime) | |
602 | cputime = 1; | |
603 | ||
604 | hb_block->hb_seq = cpu_to_le64(cputime); | |
605 | hb_block->hb_node = node_num; | |
606 | hb_block->hb_generation = cpu_to_le64(generation); | |
0db638f4 | 607 | hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS); |
a7f6a5fb MF |
608 | |
609 | /* This step must always happen last! */ | |
610 | hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, | |
611 | hb_block)); | |
612 | ||
70bacbdb | 613 | mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n", |
5fdf1e67 | 614 | (long long)generation, |
70bacbdb | 615 | le32_to_cpu(hb_block->hb_cksum)); |
a7f6a5fb MF |
616 | } |
617 | ||
618 | static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, | |
619 | struct o2nm_node *node, | |
620 | int idx) | |
621 | { | |
a7f6a5fb MF |
622 | struct o2hb_callback_func *f; |
623 | ||
df53cd3b | 624 | list_for_each_entry(f, &hbcall->list, hc_item) { |
a7f6a5fb MF |
625 | mlog(ML_HEARTBEAT, "calling funcs %p\n", f); |
626 | (f->hc_func)(node, idx, f->hc_data); | |
627 | } | |
628 | } | |
629 | ||
630 | /* Will run the list in order until we process the passed event */ | |
631 | static void o2hb_run_event_list(struct o2hb_node_event *queued_event) | |
632 | { | |
a7f6a5fb MF |
633 | struct o2hb_callback *hbcall; |
634 | struct o2hb_node_event *event; | |
635 | ||
a7f6a5fb MF |
636 | /* Holding callback sem assures we don't alter the callback |
637 | * lists when doing this, and serializes ourselves with other | |
638 | * processes wanting callbacks. */ | |
639 | down_write(&o2hb_callback_sem); | |
640 | ||
641 | spin_lock(&o2hb_live_lock); | |
642 | while (!list_empty(&o2hb_node_events) | |
643 | && !list_empty(&queued_event->hn_item)) { | |
644 | event = list_entry(o2hb_node_events.next, | |
645 | struct o2hb_node_event, | |
646 | hn_item); | |
647 | list_del_init(&event->hn_item); | |
648 | spin_unlock(&o2hb_live_lock); | |
649 | ||
650 | mlog(ML_HEARTBEAT, "Node %s event for %d\n", | |
651 | event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", | |
652 | event->hn_node_num); | |
653 | ||
654 | hbcall = hbcall_from_type(event->hn_event_type); | |
655 | ||
656 | /* We should *never* have gotten on to the list with a | |
657 | * bad type... This isn't something that we should try | |
658 | * to recover from. */ | |
659 | BUG_ON(IS_ERR(hbcall)); | |
660 | ||
661 | o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); | |
662 | ||
663 | spin_lock(&o2hb_live_lock); | |
664 | } | |
665 | spin_unlock(&o2hb_live_lock); | |
666 | ||
667 | up_write(&o2hb_callback_sem); | |
668 | } | |
669 | ||
670 | static void o2hb_queue_node_event(struct o2hb_node_event *event, | |
671 | enum o2hb_callback_type type, | |
672 | struct o2nm_node *node, | |
673 | int node_num) | |
674 | { | |
675 | assert_spin_locked(&o2hb_live_lock); | |
676 | ||
0e105d37 SM |
677 | BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB)); |
678 | ||
a7f6a5fb MF |
679 | event->hn_event_type = type; |
680 | event->hn_node = node; | |
681 | event->hn_node_num = node_num; | |
682 | ||
683 | mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", | |
684 | type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); | |
685 | ||
686 | list_add_tail(&event->hn_item, &o2hb_node_events); | |
687 | } | |
688 | ||
689 | static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) | |
690 | { | |
691 | struct o2hb_node_event event = | |
692 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
693 | struct o2nm_node *node; | |
6f8648e8 | 694 | int queued = 0; |
a7f6a5fb MF |
695 | |
696 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
697 | if (!node) | |
698 | return; | |
699 | ||
700 | spin_lock(&o2hb_live_lock); | |
701 | if (!list_empty(&slot->ds_live_item)) { | |
702 | mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", | |
703 | slot->ds_node_num); | |
704 | ||
705 | list_del_init(&slot->ds_live_item); | |
706 | ||
707 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
708 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
709 | ||
710 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
711 | slot->ds_node_num); | |
6f8648e8 | 712 | queued = 1; |
a7f6a5fb MF |
713 | } |
714 | } | |
715 | spin_unlock(&o2hb_live_lock); | |
716 | ||
6f8648e8 J |
717 | if (queued) |
718 | o2hb_run_event_list(&event); | |
a7f6a5fb MF |
719 | |
720 | o2nm_node_put(node); | |
721 | } | |
722 | ||
d2eece37 | 723 | static void o2hb_set_quorum_device(struct o2hb_region *reg) |
43182d2a | 724 | { |
43182d2a SM |
725 | if (!o2hb_global_heartbeat_active()) |
726 | return; | |
727 | ||
d2eece37 SM |
728 | /* Prevent race with o2hb_heartbeat_group_drop_item() */ |
729 | if (kthread_should_stop()) | |
43182d2a SM |
730 | return; |
731 | ||
d2eece37 SM |
732 | /* Tag region as quorum only after thread reaches steady state */ |
733 | if (atomic_read(®->hr_steady_iterations) != 0) | |
734 | return; | |
735 | ||
736 | spin_lock(&o2hb_live_lock); | |
737 | ||
738 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
739 | goto unlock; | |
740 | ||
43182d2a SM |
741 | /* |
742 | * A region can be added to the quorum only when it sees all | |
743 | * live nodes heartbeat on it. In other words, the region has been | |
744 | * added to all nodes. | |
745 | */ | |
746 | if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap, | |
747 | sizeof(o2hb_live_node_bitmap))) | |
d2eece37 | 748 | goto unlock; |
43182d2a | 749 | |
d2eece37 SM |
750 | printk(KERN_NOTICE "o2hb: Region %s (%s) is now a quorum device\n", |
751 | config_item_name(®->hr_item), reg->hr_dev_name); | |
43182d2a SM |
752 | |
753 | set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
58a3158a SM |
754 | |
755 | /* | |
756 | * If global heartbeat active, unpin all regions if the | |
757 | * region count > CUT_OFF | |
758 | */ | |
a8f70de3 | 759 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
760 | O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF) |
761 | o2hb_region_unpin(NULL); | |
d2eece37 SM |
762 | unlock: |
763 | spin_unlock(&o2hb_live_lock); | |
43182d2a SM |
764 | } |
765 | ||
a7f6a5fb MF |
766 | static int o2hb_check_slot(struct o2hb_region *reg, |
767 | struct o2hb_disk_slot *slot) | |
768 | { | |
769 | int changed = 0, gen_changed = 0; | |
770 | struct o2hb_node_event event = | |
771 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
772 | struct o2nm_node *node; | |
773 | struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; | |
774 | u64 cputime; | |
0db638f4 MF |
775 | unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS; |
776 | unsigned int slot_dead_ms; | |
0e105d37 | 777 | int tmp; |
6f8648e8 | 778 | int queued = 0; |
a7f6a5fb MF |
779 | |
780 | memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); | |
781 | ||
0e105d37 SM |
782 | /* |
783 | * If a node is no longer configured but is still in the livemap, we | |
784 | * may need to clear that bit from the livemap. | |
785 | */ | |
a7f6a5fb | 786 | node = o2nm_get_node_by_num(slot->ds_node_num); |
0e105d37 SM |
787 | if (!node) { |
788 | spin_lock(&o2hb_live_lock); | |
789 | tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
790 | spin_unlock(&o2hb_live_lock); | |
791 | if (!tmp) | |
792 | return 0; | |
793 | } | |
a7f6a5fb MF |
794 | |
795 | if (!o2hb_verify_crc(reg, hb_block)) { | |
796 | /* all paths from here will drop o2hb_live_lock for | |
797 | * us. */ | |
798 | spin_lock(&o2hb_live_lock); | |
799 | ||
800 | /* Don't print an error on the console in this case - | |
801 | * a freshly formatted heartbeat area will not have a | |
802 | * crc set on it. */ | |
803 | if (list_empty(&slot->ds_live_item)) | |
804 | goto out; | |
805 | ||
806 | /* The node is live but pushed out a bad crc. We | |
807 | * consider it a transient miss but don't populate any | |
808 | * other values as they may be junk. */ | |
809 | mlog(ML_ERROR, "Node %d has written a bad crc to %s\n", | |
810 | slot->ds_node_num, reg->hr_dev_name); | |
811 | o2hb_dump_slot(hb_block); | |
812 | ||
813 | slot->ds_equal_samples++; | |
814 | goto fire_callbacks; | |
815 | } | |
816 | ||
817 | /* we don't care if these wrap.. the state transitions below | |
818 | * clear at the right places */ | |
819 | cputime = le64_to_cpu(hb_block->hb_seq); | |
820 | if (slot->ds_last_time != cputime) | |
821 | slot->ds_changed_samples++; | |
822 | else | |
823 | slot->ds_equal_samples++; | |
824 | slot->ds_last_time = cputime; | |
825 | ||
826 | /* The node changed heartbeat generations. We assume this to | |
827 | * mean it dropped off but came back before we timed out. We | |
828 | * want to consider it down for the time being but don't want | |
829 | * to lose any changed_samples state we might build up to | |
830 | * considering it live again. */ | |
831 | if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { | |
832 | gen_changed = 1; | |
833 | slot->ds_equal_samples = 0; | |
70bacbdb MF |
834 | mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx " |
835 | "to 0x%llx)\n", slot->ds_node_num, | |
836 | (long long)slot->ds_last_generation, | |
837 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
838 | } |
839 | ||
840 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
841 | ||
70bacbdb MF |
842 | mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x " |
843 | "seq %llu last %llu changed %u equal %u\n", | |
844 | slot->ds_node_num, (long long)slot->ds_last_generation, | |
845 | le32_to_cpu(hb_block->hb_cksum), | |
2bd63216 | 846 | (unsigned long long)le64_to_cpu(hb_block->hb_seq), |
70bacbdb | 847 | (unsigned long long)slot->ds_last_time, slot->ds_changed_samples, |
a7f6a5fb MF |
848 | slot->ds_equal_samples); |
849 | ||
850 | spin_lock(&o2hb_live_lock); | |
851 | ||
852 | fire_callbacks: | |
853 | /* dead nodes only come to life after some number of | |
854 | * changes at any time during their dead time */ | |
855 | if (list_empty(&slot->ds_live_item) && | |
856 | slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { | |
70bacbdb MF |
857 | mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n", |
858 | slot->ds_node_num, (long long)slot->ds_last_generation); | |
a7f6a5fb | 859 | |
823a637a SM |
860 | set_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
861 | ||
a7f6a5fb MF |
862 | /* first on the list generates a callback */ |
863 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
864 | mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes " |
865 | "bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
866 | set_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
867 | ||
868 | o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, | |
869 | slot->ds_node_num); | |
870 | ||
871 | changed = 1; | |
6f8648e8 | 872 | queued = 1; |
a7f6a5fb MF |
873 | } |
874 | ||
875 | list_add_tail(&slot->ds_live_item, | |
876 | &o2hb_live_slots[slot->ds_node_num]); | |
877 | ||
878 | slot->ds_equal_samples = 0; | |
0db638f4 MF |
879 | |
880 | /* We want to be sure that all nodes agree on the | |
881 | * number of milliseconds before a node will be | |
882 | * considered dead. The self-fencing timeout is | |
883 | * computed from this value, and a discrepancy might | |
884 | * result in heartbeat calling a node dead when it | |
885 | * hasn't self-fenced yet. */ | |
886 | slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms); | |
887 | if (slot_dead_ms && slot_dead_ms != dead_ms) { | |
888 | /* TODO: Perhaps we can fail the region here. */ | |
889 | mlog(ML_ERROR, "Node %d on device %s has a dead count " | |
890 | "of %u ms, but our count is %u ms.\n" | |
891 | "Please double check your configuration values " | |
892 | "for 'O2CB_HEARTBEAT_THRESHOLD'\n", | |
893 | slot->ds_node_num, reg->hr_dev_name, slot_dead_ms, | |
894 | dead_ms); | |
895 | } | |
a7f6a5fb MF |
896 | goto out; |
897 | } | |
898 | ||
899 | /* if the list is dead, we're done.. */ | |
900 | if (list_empty(&slot->ds_live_item)) | |
901 | goto out; | |
902 | ||
903 | /* live nodes only go dead after enough consequtive missed | |
904 | * samples.. reset the missed counter whenever we see | |
905 | * activity */ | |
906 | if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { | |
907 | mlog(ML_HEARTBEAT, "Node %d left my region\n", | |
908 | slot->ds_node_num); | |
909 | ||
823a637a SM |
910 | clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
911 | ||
a7f6a5fb MF |
912 | /* last off the live_slot generates a callback */ |
913 | list_del_init(&slot->ds_live_item); | |
914 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
915 | mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live " |
916 | "nodes bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
917 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
918 | ||
0e105d37 SM |
919 | /* node can be null */ |
920 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, | |
921 | node, slot->ds_node_num); | |
a7f6a5fb MF |
922 | |
923 | changed = 1; | |
6f8648e8 | 924 | queued = 1; |
a7f6a5fb MF |
925 | } |
926 | ||
927 | /* We don't clear this because the node is still | |
928 | * actually writing new blocks. */ | |
929 | if (!gen_changed) | |
930 | slot->ds_changed_samples = 0; | |
931 | goto out; | |
932 | } | |
933 | if (slot->ds_changed_samples) { | |
934 | slot->ds_changed_samples = 0; | |
935 | slot->ds_equal_samples = 0; | |
936 | } | |
937 | out: | |
938 | spin_unlock(&o2hb_live_lock); | |
939 | ||
6f8648e8 J |
940 | if (queued) |
941 | o2hb_run_event_list(&event); | |
a7f6a5fb | 942 | |
0e105d37 SM |
943 | if (node) |
944 | o2nm_node_put(node); | |
a7f6a5fb MF |
945 | return changed; |
946 | } | |
947 | ||
518df6bd | 948 | static int o2hb_highest_node(unsigned long *nodes, int numbits) |
a7f6a5fb | 949 | { |
518df6bd | 950 | return find_last_bit(nodes, numbits); |
a7f6a5fb MF |
951 | } |
952 | ||
a9e2ae39 | 953 | static int o2hb_do_disk_heartbeat(struct o2hb_region *reg) |
a7f6a5fb | 954 | { |
d2eece37 SM |
955 | int i, ret, highest_node; |
956 | int membership_change = 0, own_slot_ok = 0; | |
a7f6a5fb | 957 | unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
0e105d37 | 958 | unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
a7f6a5fb MF |
959 | struct o2hb_bio_wait_ctxt write_wc; |
960 | ||
a9e2ae39 MF |
961 | ret = o2nm_configured_node_map(configured_nodes, |
962 | sizeof(configured_nodes)); | |
963 | if (ret) { | |
964 | mlog_errno(ret); | |
d2eece37 | 965 | goto bail; |
a9e2ae39 | 966 | } |
a7f6a5fb | 967 | |
0e105d37 SM |
968 | /* |
969 | * If a node is not configured but is in the livemap, we still need | |
970 | * to read the slot so as to be able to remove it from the livemap. | |
971 | */ | |
972 | o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap)); | |
973 | i = -1; | |
974 | while ((i = find_next_bit(live_node_bitmap, | |
975 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
976 | set_bit(i, configured_nodes); | |
977 | } | |
978 | ||
a7f6a5fb MF |
979 | highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); |
980 | if (highest_node >= O2NM_MAX_NODES) { | |
d2eece37 SM |
981 | mlog(ML_NOTICE, "o2hb: No configured nodes found!\n"); |
982 | ret = -EINVAL; | |
983 | goto bail; | |
a7f6a5fb MF |
984 | } |
985 | ||
986 | /* No sense in reading the slots of nodes that don't exist | |
987 | * yet. Of course, if the node definitions have holes in them | |
988 | * then we're reading an empty slot anyway... Consider this | |
989 | * best-effort. */ | |
990 | ret = o2hb_read_slots(reg, highest_node + 1); | |
991 | if (ret < 0) { | |
992 | mlog_errno(ret); | |
d2eece37 | 993 | goto bail; |
a7f6a5fb MF |
994 | } |
995 | ||
996 | /* With an up to date view of the slots, we can check that no | |
997 | * other node has been improperly configured to heartbeat in | |
998 | * our slot. */ | |
d2eece37 | 999 | own_slot_ok = o2hb_check_own_slot(reg); |
a7f6a5fb MF |
1000 | |
1001 | /* fill in the proper info for our next heartbeat */ | |
1002 | o2hb_prepare_block(reg, reg->hr_generation); | |
1003 | ||
b559292e | 1004 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
1005 | if (ret < 0) { |
1006 | mlog_errno(ret); | |
d2eece37 | 1007 | goto bail; |
a7f6a5fb MF |
1008 | } |
1009 | ||
1010 | i = -1; | |
33c12a54 SM |
1011 | while((i = find_next_bit(configured_nodes, |
1012 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
d2eece37 | 1013 | membership_change |= o2hb_check_slot(reg, ®->hr_slots[i]); |
a7f6a5fb MF |
1014 | } |
1015 | ||
1016 | /* | |
1017 | * We have to be sure we've advertised ourselves on disk | |
1018 | * before we can go to steady state. This ensures that | |
1019 | * people we find in our steady state have seen us. | |
1020 | */ | |
1021 | o2hb_wait_on_io(reg, &write_wc); | |
a9e2ae39 MF |
1022 | if (write_wc.wc_error) { |
1023 | /* Do not re-arm the write timeout on I/O error - we | |
1024 | * can't be sure that the new block ever made it to | |
1025 | * disk */ | |
1026 | mlog(ML_ERROR, "Write error %d on device \"%s\"\n", | |
1027 | write_wc.wc_error, reg->hr_dev_name); | |
d2eece37 SM |
1028 | ret = write_wc.wc_error; |
1029 | goto bail; | |
a9e2ae39 MF |
1030 | } |
1031 | ||
d2eece37 SM |
1032 | /* Skip disarming the timeout if own slot has stale/bad data */ |
1033 | if (own_slot_ok) { | |
1034 | o2hb_set_quorum_device(reg); | |
1035 | o2hb_arm_write_timeout(reg); | |
1036 | } | |
a7f6a5fb | 1037 | |
d2eece37 | 1038 | bail: |
a7f6a5fb | 1039 | /* let the person who launched us know when things are steady */ |
d2eece37 SM |
1040 | if (atomic_read(®->hr_steady_iterations) != 0) { |
1041 | if (!ret && own_slot_ok && !membership_change) { | |
1042 | if (atomic_dec_and_test(®->hr_steady_iterations)) | |
1043 | wake_up(&o2hb_steady_queue); | |
1044 | } | |
1045 | } | |
1046 | ||
1047 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
1048 | if (atomic_dec_and_test(®->hr_unsteady_iterations)) { | |
1049 | printk(KERN_NOTICE "o2hb: Unable to stabilize " | |
1050 | "heartbeart on region %s (%s)\n", | |
1051 | config_item_name(®->hr_item), | |
1052 | reg->hr_dev_name); | |
1053 | atomic_set(®->hr_steady_iterations, 0); | |
1054 | reg->hr_aborted_start = 1; | |
a7f6a5fb | 1055 | wake_up(&o2hb_steady_queue); |
d2eece37 SM |
1056 | ret = -EIO; |
1057 | } | |
a7f6a5fb | 1058 | } |
a9e2ae39 | 1059 | |
d2eece37 | 1060 | return ret; |
a7f6a5fb MF |
1061 | } |
1062 | ||
a7f6a5fb MF |
1063 | /* |
1064 | * we ride the region ref that the region dir holds. before the region | |
1065 | * dir is removed and drops it ref it will wait to tear down this | |
1066 | * thread. | |
1067 | */ | |
1068 | static int o2hb_thread(void *data) | |
1069 | { | |
1070 | int i, ret; | |
1071 | struct o2hb_region *reg = data; | |
a7f6a5fb | 1072 | struct o2hb_bio_wait_ctxt write_wc; |
40476b82 | 1073 | ktime_t before_hb, after_hb; |
a7f6a5fb MF |
1074 | unsigned int elapsed_msec; |
1075 | ||
1076 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); | |
1077 | ||
8698a745 | 1078 | set_user_nice(current, MIN_NICE); |
a7f6a5fb | 1079 | |
cfc069d3 SM |
1080 | /* Pin node */ |
1081 | o2nm_depend_this_node(); | |
1082 | ||
d2eece37 SM |
1083 | while (!kthread_should_stop() && |
1084 | !reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
a7f6a5fb | 1085 | /* We track the time spent inside |
025dfdaf | 1086 | * o2hb_do_disk_heartbeat so that we avoid more than |
a7f6a5fb MF |
1087 | * hr_timeout_ms between disk writes. On busy systems |
1088 | * this should result in a heartbeat which is less | |
1089 | * likely to time itself out. */ | |
40476b82 | 1090 | before_hb = ktime_get_real(); |
a7f6a5fb | 1091 | |
d2eece37 | 1092 | ret = o2hb_do_disk_heartbeat(reg); |
a7f6a5fb | 1093 | |
40476b82 TR |
1094 | after_hb = ktime_get_real(); |
1095 | ||
1096 | elapsed_msec = (unsigned int) | |
1097 | ktime_ms_delta(after_hb, before_hb); | |
a7f6a5fb | 1098 | |
b31d308d | 1099 | mlog(ML_HEARTBEAT, |
40476b82 TR |
1100 | "start = %lld, end = %lld, msec = %u, ret = %d\n", |
1101 | before_hb.tv64, after_hb.tv64, elapsed_msec, ret); | |
a7f6a5fb | 1102 | |
d2eece37 SM |
1103 | if (!kthread_should_stop() && |
1104 | elapsed_msec < reg->hr_timeout_ms) { | |
a7f6a5fb MF |
1105 | /* the kthread api has blocked signals for us so no |
1106 | * need to record the return value. */ | |
1107 | msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); | |
1108 | } | |
1109 | } | |
1110 | ||
1111 | o2hb_disarm_write_timeout(reg); | |
1112 | ||
1113 | /* unclean stop is only used in very bad situation */ | |
1114 | for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) | |
1115 | o2hb_shutdown_slot(®->hr_slots[i]); | |
1116 | ||
1117 | /* Explicit down notification - avoid forcing the other nodes | |
1118 | * to timeout on this region when we could just as easily | |
1119 | * write a clear generation - thus indicating to them that | |
1120 | * this node has left this region. | |
d2eece37 SM |
1121 | */ |
1122 | if (!reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
1123 | o2hb_prepare_block(reg, 0); | |
1124 | ret = o2hb_issue_node_write(reg, &write_wc); | |
1125 | if (ret == 0) | |
1126 | o2hb_wait_on_io(reg, &write_wc); | |
1127 | else | |
1128 | mlog_errno(ret); | |
a7f6a5fb MF |
1129 | } |
1130 | ||
cfc069d3 SM |
1131 | /* Unpin node */ |
1132 | o2nm_undepend_this_node(); | |
a7f6a5fb | 1133 | |
d2eece37 | 1134 | mlog(ML_HEARTBEAT|ML_KTHREAD, "o2hb thread exiting\n"); |
a7f6a5fb MF |
1135 | |
1136 | return 0; | |
1137 | } | |
1138 | ||
87d3d3f3 SM |
1139 | #ifdef CONFIG_DEBUG_FS |
1140 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1141 | { | |
8ca8b0bb | 1142 | struct o2hb_debug_buf *db = inode->i_private; |
1f285305 | 1143 | struct o2hb_region *reg; |
87d3d3f3 | 1144 | unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
bb570a5d | 1145 | unsigned long lts; |
87d3d3f3 SM |
1146 | char *buf = NULL; |
1147 | int i = -1; | |
1148 | int out = 0; | |
1149 | ||
8ca8b0bb SM |
1150 | /* max_nodes should be the largest bitmap we pass here */ |
1151 | BUG_ON(sizeof(map) < db->db_size); | |
1152 | ||
87d3d3f3 SM |
1153 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
1154 | if (!buf) | |
1155 | goto bail; | |
1156 | ||
8ca8b0bb SM |
1157 | switch (db->db_type) { |
1158 | case O2HB_DB_TYPE_LIVENODES: | |
a6de0136 SM |
1159 | case O2HB_DB_TYPE_LIVEREGIONS: |
1160 | case O2HB_DB_TYPE_QUORUMREGIONS: | |
1161 | case O2HB_DB_TYPE_FAILEDREGIONS: | |
8ca8b0bb SM |
1162 | spin_lock(&o2hb_live_lock); |
1163 | memcpy(map, db->db_data, db->db_size); | |
1164 | spin_unlock(&o2hb_live_lock); | |
1165 | break; | |
87d3d3f3 | 1166 | |
1f285305 SM |
1167 | case O2HB_DB_TYPE_REGION_LIVENODES: |
1168 | spin_lock(&o2hb_live_lock); | |
1169 | reg = (struct o2hb_region *)db->db_data; | |
1170 | memcpy(map, reg->hr_live_node_bitmap, db->db_size); | |
1171 | spin_unlock(&o2hb_live_lock); | |
1172 | break; | |
1173 | ||
1174 | case O2HB_DB_TYPE_REGION_NUMBER: | |
1175 | reg = (struct o2hb_region *)db->db_data; | |
1176 | out += snprintf(buf + out, PAGE_SIZE - out, "%d\n", | |
1177 | reg->hr_region_num); | |
1178 | goto done; | |
1179 | ||
43695d09 SM |
1180 | case O2HB_DB_TYPE_REGION_ELAPSED_TIME: |
1181 | reg = (struct o2hb_region *)db->db_data; | |
bb570a5d SM |
1182 | lts = reg->hr_last_timeout_start; |
1183 | /* If 0, it has never been set before */ | |
1184 | if (lts) | |
1185 | lts = jiffies_to_msecs(jiffies - lts); | |
1186 | out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); | |
43695d09 SM |
1187 | goto done; |
1188 | ||
cb0586bd SM |
1189 | case O2HB_DB_TYPE_REGION_PINNED: |
1190 | reg = (struct o2hb_region *)db->db_data; | |
1191 | out += snprintf(buf + out, PAGE_SIZE - out, "%u\n", | |
1192 | !!reg->hr_item_pinned); | |
1193 | goto done; | |
1194 | ||
8ca8b0bb SM |
1195 | default: |
1196 | goto done; | |
1197 | } | |
1198 | ||
1199 | while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len) | |
87d3d3f3 SM |
1200 | out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i); |
1201 | out += snprintf(buf + out, PAGE_SIZE - out, "\n"); | |
1202 | ||
8ca8b0bb | 1203 | done: |
87d3d3f3 SM |
1204 | i_size_write(inode, out); |
1205 | ||
1206 | file->private_data = buf; | |
1207 | ||
1208 | return 0; | |
1209 | bail: | |
1210 | return -ENOMEM; | |
1211 | } | |
1212 | ||
1213 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1214 | { | |
1215 | kfree(file->private_data); | |
1216 | return 0; | |
1217 | } | |
1218 | ||
1219 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1220 | size_t nbytes, loff_t *ppos) | |
1221 | { | |
1222 | return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, | |
1223 | i_size_read(file->f_mapping->host)); | |
1224 | } | |
1225 | #else | |
1226 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1227 | { | |
1228 | return 0; | |
1229 | } | |
1230 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1231 | { | |
1232 | return 0; | |
1233 | } | |
1234 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1235 | size_t nbytes, loff_t *ppos) | |
1236 | { | |
1237 | return 0; | |
1238 | } | |
1239 | #endif /* CONFIG_DEBUG_FS */ | |
1240 | ||
828c0950 | 1241 | static const struct file_operations o2hb_debug_fops = { |
87d3d3f3 SM |
1242 | .open = o2hb_debug_open, |
1243 | .release = o2hb_debug_release, | |
1244 | .read = o2hb_debug_read, | |
1245 | .llseek = generic_file_llseek, | |
1246 | }; | |
1247 | ||
1248 | void o2hb_exit(void) | |
1249 | { | |
8ca8b0bb | 1250 | kfree(o2hb_db_livenodes); |
a6de0136 SM |
1251 | kfree(o2hb_db_liveregions); |
1252 | kfree(o2hb_db_quorumregions); | |
1253 | kfree(o2hb_db_failedregions); | |
1254 | debugfs_remove(o2hb_debug_failedregions); | |
1255 | debugfs_remove(o2hb_debug_quorumregions); | |
1256 | debugfs_remove(o2hb_debug_liveregions); | |
8ca8b0bb SM |
1257 | debugfs_remove(o2hb_debug_livenodes); |
1258 | debugfs_remove(o2hb_debug_dir); | |
1259 | } | |
1260 | ||
1261 | static struct dentry *o2hb_debug_create(const char *name, struct dentry *dir, | |
1262 | struct o2hb_debug_buf **db, int db_len, | |
1263 | int type, int size, int len, void *data) | |
1264 | { | |
1265 | *db = kmalloc(db_len, GFP_KERNEL); | |
1266 | if (!*db) | |
1267 | return NULL; | |
1268 | ||
1269 | (*db)->db_type = type; | |
1270 | (*db)->db_size = size; | |
1271 | (*db)->db_len = len; | |
1272 | (*db)->db_data = data; | |
1273 | ||
1274 | return debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db, | |
1275 | &o2hb_debug_fops); | |
1276 | } | |
1277 | ||
1278 | static int o2hb_debug_init(void) | |
1279 | { | |
1280 | int ret = -ENOMEM; | |
1281 | ||
1282 | o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL); | |
8f443e23 | 1283 | if (!o2hb_debug_dir) { |
8ca8b0bb SM |
1284 | mlog_errno(ret); |
1285 | goto bail; | |
1286 | } | |
1287 | ||
1288 | o2hb_debug_livenodes = o2hb_debug_create(O2HB_DEBUG_LIVENODES, | |
1289 | o2hb_debug_dir, | |
1290 | &o2hb_db_livenodes, | |
1291 | sizeof(*o2hb_db_livenodes), | |
1292 | O2HB_DB_TYPE_LIVENODES, | |
1293 | sizeof(o2hb_live_node_bitmap), | |
1294 | O2NM_MAX_NODES, | |
1295 | o2hb_live_node_bitmap); | |
8f443e23 | 1296 | if (!o2hb_debug_livenodes) { |
8ca8b0bb SM |
1297 | mlog_errno(ret); |
1298 | goto bail; | |
1299 | } | |
a6de0136 SM |
1300 | |
1301 | o2hb_debug_liveregions = o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS, | |
1302 | o2hb_debug_dir, | |
1303 | &o2hb_db_liveregions, | |
1304 | sizeof(*o2hb_db_liveregions), | |
1305 | O2HB_DB_TYPE_LIVEREGIONS, | |
1306 | sizeof(o2hb_live_region_bitmap), | |
1307 | O2NM_MAX_REGIONS, | |
1308 | o2hb_live_region_bitmap); | |
8f443e23 | 1309 | if (!o2hb_debug_liveregions) { |
a6de0136 SM |
1310 | mlog_errno(ret); |
1311 | goto bail; | |
1312 | } | |
1313 | ||
1314 | o2hb_debug_quorumregions = | |
1315 | o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS, | |
1316 | o2hb_debug_dir, | |
1317 | &o2hb_db_quorumregions, | |
1318 | sizeof(*o2hb_db_quorumregions), | |
1319 | O2HB_DB_TYPE_QUORUMREGIONS, | |
1320 | sizeof(o2hb_quorum_region_bitmap), | |
1321 | O2NM_MAX_REGIONS, | |
1322 | o2hb_quorum_region_bitmap); | |
8f443e23 | 1323 | if (!o2hb_debug_quorumregions) { |
a6de0136 SM |
1324 | mlog_errno(ret); |
1325 | goto bail; | |
1326 | } | |
1327 | ||
1328 | o2hb_debug_failedregions = | |
1329 | o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS, | |
1330 | o2hb_debug_dir, | |
1331 | &o2hb_db_failedregions, | |
1332 | sizeof(*o2hb_db_failedregions), | |
1333 | O2HB_DB_TYPE_FAILEDREGIONS, | |
1334 | sizeof(o2hb_failed_region_bitmap), | |
1335 | O2NM_MAX_REGIONS, | |
1336 | o2hb_failed_region_bitmap); | |
8f443e23 | 1337 | if (!o2hb_debug_failedregions) { |
a6de0136 SM |
1338 | mlog_errno(ret); |
1339 | goto bail; | |
1340 | } | |
1341 | ||
8ca8b0bb SM |
1342 | ret = 0; |
1343 | bail: | |
1344 | if (ret) | |
1345 | o2hb_exit(); | |
1346 | ||
1347 | return ret; | |
87d3d3f3 SM |
1348 | } |
1349 | ||
1350 | int o2hb_init(void) | |
a7f6a5fb MF |
1351 | { |
1352 | int i; | |
1353 | ||
1354 | for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) | |
1355 | INIT_LIST_HEAD(&o2hb_callbacks[i].list); | |
1356 | ||
1357 | for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) | |
1358 | INIT_LIST_HEAD(&o2hb_live_slots[i]); | |
1359 | ||
1360 | INIT_LIST_HEAD(&o2hb_node_events); | |
1361 | ||
1362 | memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap)); | |
536f0741 | 1363 | memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap)); |
e7d656ba | 1364 | memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap)); |
43182d2a | 1365 | memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap)); |
b1c5ebfb | 1366 | memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap)); |
87d3d3f3 | 1367 | |
58a3158a SM |
1368 | o2hb_dependent_users = 0; |
1369 | ||
8ca8b0bb | 1370 | return o2hb_debug_init(); |
a7f6a5fb MF |
1371 | } |
1372 | ||
1373 | /* if we're already in a callback then we're already serialized by the sem */ | |
1374 | static void o2hb_fill_node_map_from_callback(unsigned long *map, | |
1375 | unsigned bytes) | |
1376 | { | |
1377 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); | |
1378 | ||
1379 | memcpy(map, &o2hb_live_node_bitmap, bytes); | |
1380 | } | |
1381 | ||
1382 | /* | |
1383 | * get a map of all nodes that are heartbeating in any regions | |
1384 | */ | |
1385 | void o2hb_fill_node_map(unsigned long *map, unsigned bytes) | |
1386 | { | |
1387 | /* callers want to serialize this map and callbacks so that they | |
1388 | * can trust that they don't miss nodes coming to the party */ | |
1389 | down_read(&o2hb_callback_sem); | |
1390 | spin_lock(&o2hb_live_lock); | |
1391 | o2hb_fill_node_map_from_callback(map, bytes); | |
1392 | spin_unlock(&o2hb_live_lock); | |
1393 | up_read(&o2hb_callback_sem); | |
1394 | } | |
1395 | EXPORT_SYMBOL_GPL(o2hb_fill_node_map); | |
1396 | ||
1397 | /* | |
1398 | * heartbeat configfs bits. The heartbeat set is a default set under | |
1399 | * the cluster set in nodemanager.c. | |
1400 | */ | |
1401 | ||
1402 | static struct o2hb_region *to_o2hb_region(struct config_item *item) | |
1403 | { | |
1404 | return item ? container_of(item, struct o2hb_region, hr_item) : NULL; | |
1405 | } | |
1406 | ||
1407 | /* drop_item only drops its ref after killing the thread, nothing should | |
1408 | * be using the region anymore. this has to clean up any state that | |
1409 | * attributes might have built up. */ | |
1410 | static void o2hb_region_release(struct config_item *item) | |
1411 | { | |
1412 | int i; | |
1413 | struct page *page; | |
1414 | struct o2hb_region *reg = to_o2hb_region(item); | |
1415 | ||
d2eece37 SM |
1416 | mlog(ML_HEARTBEAT, "hb region release (%s)\n", reg->hr_dev_name); |
1417 | ||
d787ab09 | 1418 | kfree(reg->hr_tmp_block); |
a7f6a5fb MF |
1419 | |
1420 | if (reg->hr_slot_data) { | |
1421 | for (i = 0; i < reg->hr_num_pages; i++) { | |
1422 | page = reg->hr_slot_data[i]; | |
1423 | if (page) | |
1424 | __free_page(page); | |
1425 | } | |
1426 | kfree(reg->hr_slot_data); | |
1427 | } | |
1428 | ||
1429 | if (reg->hr_bdev) | |
9a1c3542 | 1430 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb | 1431 | |
d787ab09 | 1432 | kfree(reg->hr_slots); |
a7f6a5fb | 1433 | |
1f285305 SM |
1434 | kfree(reg->hr_db_regnum); |
1435 | kfree(reg->hr_db_livenodes); | |
1436 | debugfs_remove(reg->hr_debug_livenodes); | |
1437 | debugfs_remove(reg->hr_debug_regnum); | |
d4396eaf | 1438 | debugfs_remove(reg->hr_debug_elapsed_time); |
cb0586bd | 1439 | debugfs_remove(reg->hr_debug_pinned); |
1f285305 SM |
1440 | debugfs_remove(reg->hr_debug_dir); |
1441 | ||
a7f6a5fb MF |
1442 | spin_lock(&o2hb_live_lock); |
1443 | list_del(®->hr_all_item); | |
1444 | spin_unlock(&o2hb_live_lock); | |
1445 | ||
1446 | kfree(reg); | |
1447 | } | |
1448 | ||
1449 | static int o2hb_read_block_input(struct o2hb_region *reg, | |
1450 | const char *page, | |
1451 | size_t count, | |
1452 | unsigned long *ret_bytes, | |
1453 | unsigned int *ret_bits) | |
1454 | { | |
1455 | unsigned long bytes; | |
1456 | char *p = (char *)page; | |
1457 | ||
1458 | bytes = simple_strtoul(p, &p, 0); | |
1459 | if (!p || (*p && (*p != '\n'))) | |
1460 | return -EINVAL; | |
1461 | ||
1462 | /* Heartbeat and fs min / max block sizes are the same. */ | |
1463 | if (bytes > 4096 || bytes < 512) | |
1464 | return -ERANGE; | |
1465 | if (hweight16(bytes) != 1) | |
1466 | return -EINVAL; | |
1467 | ||
1468 | if (ret_bytes) | |
1469 | *ret_bytes = bytes; | |
1470 | if (ret_bits) | |
1471 | *ret_bits = ffs(bytes) - 1; | |
1472 | ||
1473 | return 0; | |
1474 | } | |
1475 | ||
1476 | static ssize_t o2hb_region_block_bytes_read(struct o2hb_region *reg, | |
1477 | char *page) | |
1478 | { | |
1479 | return sprintf(page, "%u\n", reg->hr_block_bytes); | |
1480 | } | |
1481 | ||
1482 | static ssize_t o2hb_region_block_bytes_write(struct o2hb_region *reg, | |
1483 | const char *page, | |
1484 | size_t count) | |
1485 | { | |
1486 | int status; | |
1487 | unsigned long block_bytes; | |
1488 | unsigned int block_bits; | |
1489 | ||
1490 | if (reg->hr_bdev) | |
1491 | return -EINVAL; | |
1492 | ||
1493 | status = o2hb_read_block_input(reg, page, count, | |
1494 | &block_bytes, &block_bits); | |
1495 | if (status) | |
1496 | return status; | |
1497 | ||
1498 | reg->hr_block_bytes = (unsigned int)block_bytes; | |
1499 | reg->hr_block_bits = block_bits; | |
1500 | ||
1501 | return count; | |
1502 | } | |
1503 | ||
1504 | static ssize_t o2hb_region_start_block_read(struct o2hb_region *reg, | |
1505 | char *page) | |
1506 | { | |
1507 | return sprintf(page, "%llu\n", reg->hr_start_block); | |
1508 | } | |
1509 | ||
1510 | static ssize_t o2hb_region_start_block_write(struct o2hb_region *reg, | |
1511 | const char *page, | |
1512 | size_t count) | |
1513 | { | |
1514 | unsigned long long tmp; | |
1515 | char *p = (char *)page; | |
1516 | ||
1517 | if (reg->hr_bdev) | |
1518 | return -EINVAL; | |
1519 | ||
1520 | tmp = simple_strtoull(p, &p, 0); | |
1521 | if (!p || (*p && (*p != '\n'))) | |
1522 | return -EINVAL; | |
1523 | ||
1524 | reg->hr_start_block = tmp; | |
1525 | ||
1526 | return count; | |
1527 | } | |
1528 | ||
1529 | static ssize_t o2hb_region_blocks_read(struct o2hb_region *reg, | |
1530 | char *page) | |
1531 | { | |
1532 | return sprintf(page, "%d\n", reg->hr_blocks); | |
1533 | } | |
1534 | ||
1535 | static ssize_t o2hb_region_blocks_write(struct o2hb_region *reg, | |
1536 | const char *page, | |
1537 | size_t count) | |
1538 | { | |
1539 | unsigned long tmp; | |
1540 | char *p = (char *)page; | |
1541 | ||
1542 | if (reg->hr_bdev) | |
1543 | return -EINVAL; | |
1544 | ||
1545 | tmp = simple_strtoul(p, &p, 0); | |
1546 | if (!p || (*p && (*p != '\n'))) | |
1547 | return -EINVAL; | |
1548 | ||
1549 | if (tmp > O2NM_MAX_NODES || tmp == 0) | |
1550 | return -ERANGE; | |
1551 | ||
1552 | reg->hr_blocks = (unsigned int)tmp; | |
1553 | ||
1554 | return count; | |
1555 | } | |
1556 | ||
1557 | static ssize_t o2hb_region_dev_read(struct o2hb_region *reg, | |
1558 | char *page) | |
1559 | { | |
1560 | unsigned int ret = 0; | |
1561 | ||
1562 | if (reg->hr_bdev) | |
1563 | ret = sprintf(page, "%s\n", reg->hr_dev_name); | |
1564 | ||
1565 | return ret; | |
1566 | } | |
1567 | ||
1568 | static void o2hb_init_region_params(struct o2hb_region *reg) | |
1569 | { | |
1570 | reg->hr_slots_per_page = PAGE_CACHE_SIZE >> reg->hr_block_bits; | |
1571 | reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; | |
1572 | ||
1573 | mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", | |
1574 | reg->hr_start_block, reg->hr_blocks); | |
1575 | mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", | |
1576 | reg->hr_block_bytes, reg->hr_block_bits); | |
1577 | mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); | |
1578 | mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); | |
1579 | } | |
1580 | ||
1581 | static int o2hb_map_slot_data(struct o2hb_region *reg) | |
1582 | { | |
1583 | int i, j; | |
1584 | unsigned int last_slot; | |
1585 | unsigned int spp = reg->hr_slots_per_page; | |
1586 | struct page *page; | |
1587 | char *raw; | |
1588 | struct o2hb_disk_slot *slot; | |
1589 | ||
1590 | reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); | |
372a447c | 1591 | if (reg->hr_tmp_block == NULL) |
a7f6a5fb | 1592 | return -ENOMEM; |
a7f6a5fb MF |
1593 | |
1594 | reg->hr_slots = kcalloc(reg->hr_blocks, | |
1595 | sizeof(struct o2hb_disk_slot), GFP_KERNEL); | |
372a447c | 1596 | if (reg->hr_slots == NULL) |
a7f6a5fb | 1597 | return -ENOMEM; |
a7f6a5fb MF |
1598 | |
1599 | for(i = 0; i < reg->hr_blocks; i++) { | |
1600 | slot = ®->hr_slots[i]; | |
1601 | slot->ds_node_num = i; | |
1602 | INIT_LIST_HEAD(&slot->ds_live_item); | |
1603 | slot->ds_raw_block = NULL; | |
1604 | } | |
1605 | ||
1606 | reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; | |
1607 | mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " | |
1608 | "at %u blocks per page\n", | |
1609 | reg->hr_num_pages, reg->hr_blocks, spp); | |
1610 | ||
1611 | reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), | |
1612 | GFP_KERNEL); | |
372a447c | 1613 | if (!reg->hr_slot_data) |
a7f6a5fb | 1614 | return -ENOMEM; |
a7f6a5fb MF |
1615 | |
1616 | for(i = 0; i < reg->hr_num_pages; i++) { | |
1617 | page = alloc_page(GFP_KERNEL); | |
372a447c | 1618 | if (!page) |
a7f6a5fb | 1619 | return -ENOMEM; |
a7f6a5fb MF |
1620 | |
1621 | reg->hr_slot_data[i] = page; | |
1622 | ||
1623 | last_slot = i * spp; | |
1624 | raw = page_address(page); | |
1625 | for (j = 0; | |
1626 | (j < spp) && ((j + last_slot) < reg->hr_blocks); | |
1627 | j++) { | |
1628 | BUG_ON((j + last_slot) >= reg->hr_blocks); | |
1629 | ||
1630 | slot = ®->hr_slots[j + last_slot]; | |
1631 | slot->ds_raw_block = | |
1632 | (struct o2hb_disk_heartbeat_block *) raw; | |
1633 | ||
1634 | raw += reg->hr_block_bytes; | |
1635 | } | |
1636 | } | |
1637 | ||
1638 | return 0; | |
1639 | } | |
1640 | ||
1641 | /* Read in all the slots available and populate the tracking | |
1642 | * structures so that we can start with a baseline idea of what's | |
1643 | * there. */ | |
1644 | static int o2hb_populate_slot_data(struct o2hb_region *reg) | |
1645 | { | |
1646 | int ret, i; | |
1647 | struct o2hb_disk_slot *slot; | |
1648 | struct o2hb_disk_heartbeat_block *hb_block; | |
1649 | ||
a7f6a5fb | 1650 | ret = o2hb_read_slots(reg, reg->hr_blocks); |
372a447c | 1651 | if (ret) |
a7f6a5fb | 1652 | goto out; |
a7f6a5fb MF |
1653 | |
1654 | /* We only want to get an idea of the values initially in each | |
1655 | * slot, so we do no verification - o2hb_check_slot will | |
1656 | * actually determine if each configured slot is valid and | |
1657 | * whether any values have changed. */ | |
1658 | for(i = 0; i < reg->hr_blocks; i++) { | |
1659 | slot = ®->hr_slots[i]; | |
1660 | hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; | |
1661 | ||
1662 | /* Only fill the values that o2hb_check_slot uses to | |
1663 | * determine changing slots */ | |
1664 | slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); | |
1665 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
1666 | } | |
1667 | ||
1668 | out: | |
a7f6a5fb MF |
1669 | return ret; |
1670 | } | |
1671 | ||
1672 | /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */ | |
1673 | static ssize_t o2hb_region_dev_write(struct o2hb_region *reg, | |
1674 | const char *page, | |
1675 | size_t count) | |
1676 | { | |
e6c352db | 1677 | struct task_struct *hb_task; |
a7f6a5fb MF |
1678 | long fd; |
1679 | int sectsize; | |
1680 | char *p = (char *)page; | |
2903ff01 AV |
1681 | struct fd f; |
1682 | struct inode *inode; | |
a7f6a5fb | 1683 | ssize_t ret = -EINVAL; |
76d9fc29 | 1684 | int live_threshold; |
a7f6a5fb MF |
1685 | |
1686 | if (reg->hr_bdev) | |
1687 | goto out; | |
1688 | ||
1689 | /* We can't heartbeat without having had our node number | |
1690 | * configured yet. */ | |
1691 | if (o2nm_this_node() == O2NM_MAX_NODES) | |
1692 | goto out; | |
1693 | ||
1694 | fd = simple_strtol(p, &p, 0); | |
1695 | if (!p || (*p && (*p != '\n'))) | |
1696 | goto out; | |
1697 | ||
1698 | if (fd < 0 || fd >= INT_MAX) | |
1699 | goto out; | |
1700 | ||
2903ff01 AV |
1701 | f = fdget(fd); |
1702 | if (f.file == NULL) | |
a7f6a5fb MF |
1703 | goto out; |
1704 | ||
1705 | if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || | |
1706 | reg->hr_block_bytes == 0) | |
2903ff01 | 1707 | goto out2; |
a7f6a5fb | 1708 | |
2903ff01 | 1709 | inode = igrab(f.file->f_mapping->host); |
a7f6a5fb | 1710 | if (inode == NULL) |
2903ff01 | 1711 | goto out2; |
a7f6a5fb MF |
1712 | |
1713 | if (!S_ISBLK(inode->i_mode)) | |
2903ff01 | 1714 | goto out3; |
a7f6a5fb | 1715 | |
2903ff01 | 1716 | reg->hr_bdev = I_BDEV(f.file->f_mapping->host); |
e525fd89 | 1717 | ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, NULL); |
a7f6a5fb MF |
1718 | if (ret) { |
1719 | reg->hr_bdev = NULL; | |
2903ff01 | 1720 | goto out3; |
a7f6a5fb MF |
1721 | } |
1722 | inode = NULL; | |
1723 | ||
1724 | bdevname(reg->hr_bdev, reg->hr_dev_name); | |
1725 | ||
e1defc4f | 1726 | sectsize = bdev_logical_block_size(reg->hr_bdev); |
a7f6a5fb MF |
1727 | if (sectsize != reg->hr_block_bytes) { |
1728 | mlog(ML_ERROR, | |
1729 | "blocksize %u incorrect for device, expected %d", | |
1730 | reg->hr_block_bytes, sectsize); | |
1731 | ret = -EINVAL; | |
2903ff01 | 1732 | goto out3; |
a7f6a5fb MF |
1733 | } |
1734 | ||
1735 | o2hb_init_region_params(reg); | |
1736 | ||
1737 | /* Generation of zero is invalid */ | |
1738 | do { | |
1739 | get_random_bytes(®->hr_generation, | |
1740 | sizeof(reg->hr_generation)); | |
1741 | } while (reg->hr_generation == 0); | |
1742 | ||
1743 | ret = o2hb_map_slot_data(reg); | |
1744 | if (ret) { | |
1745 | mlog_errno(ret); | |
2903ff01 | 1746 | goto out3; |
a7f6a5fb MF |
1747 | } |
1748 | ||
1749 | ret = o2hb_populate_slot_data(reg); | |
1750 | if (ret) { | |
1751 | mlog_errno(ret); | |
2903ff01 | 1752 | goto out3; |
a7f6a5fb MF |
1753 | } |
1754 | ||
c4028958 | 1755 | INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout); |
a7f6a5fb MF |
1756 | |
1757 | /* | |
1758 | * A node is considered live after it has beat LIVE_THRESHOLD | |
1759 | * times. We're not steady until we've given them a chance | |
1760 | * _after_ our first read. | |
76d9fc29 SM |
1761 | * The default threshold is bare minimum so as to limit the delay |
1762 | * during mounts. For global heartbeat, the threshold doubled for the | |
1763 | * first region. | |
a7f6a5fb | 1764 | */ |
76d9fc29 SM |
1765 | live_threshold = O2HB_LIVE_THRESHOLD; |
1766 | if (o2hb_global_heartbeat_active()) { | |
1767 | spin_lock(&o2hb_live_lock); | |
a8f70de3 | 1768 | if (bitmap_weight(o2hb_region_bitmap, O2NM_MAX_REGIONS) == 1) |
76d9fc29 SM |
1769 | live_threshold <<= 1; |
1770 | spin_unlock(&o2hb_live_lock); | |
1771 | } | |
d2eece37 SM |
1772 | ++live_threshold; |
1773 | atomic_set(®->hr_steady_iterations, live_threshold); | |
1774 | /* unsteady_iterations is double the steady_iterations */ | |
1775 | atomic_set(®->hr_unsteady_iterations, (live_threshold << 1)); | |
a7f6a5fb | 1776 | |
e6c352db JB |
1777 | hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s", |
1778 | reg->hr_item.ci_name); | |
1779 | if (IS_ERR(hb_task)) { | |
1780 | ret = PTR_ERR(hb_task); | |
a7f6a5fb | 1781 | mlog_errno(ret); |
2903ff01 | 1782 | goto out3; |
a7f6a5fb MF |
1783 | } |
1784 | ||
e6c352db JB |
1785 | spin_lock(&o2hb_live_lock); |
1786 | reg->hr_task = hb_task; | |
1787 | spin_unlock(&o2hb_live_lock); | |
1788 | ||
a7f6a5fb MF |
1789 | ret = wait_event_interruptible(o2hb_steady_queue, |
1790 | atomic_read(®->hr_steady_iterations) == 0); | |
1791 | if (ret) { | |
d2eece37 SM |
1792 | atomic_set(®->hr_steady_iterations, 0); |
1793 | reg->hr_aborted_start = 1; | |
1794 | } | |
e6c352db | 1795 | |
d2eece37 SM |
1796 | if (reg->hr_aborted_start) { |
1797 | ret = -EIO; | |
2903ff01 | 1798 | goto out3; |
a7f6a5fb MF |
1799 | } |
1800 | ||
e6df3a66 JB |
1801 | /* Ok, we were woken. Make sure it wasn't by drop_item() */ |
1802 | spin_lock(&o2hb_live_lock); | |
1803 | hb_task = reg->hr_task; | |
e7d656ba SM |
1804 | if (o2hb_global_heartbeat_active()) |
1805 | set_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
e6df3a66 JB |
1806 | spin_unlock(&o2hb_live_lock); |
1807 | ||
1808 | if (hb_task) | |
1809 | ret = count; | |
1810 | else | |
1811 | ret = -EIO; | |
1812 | ||
18c50cb0 | 1813 | if (hb_task && o2hb_global_heartbeat_active()) |
d2eece37 SM |
1814 | printk(KERN_NOTICE "o2hb: Heartbeat started on region %s (%s)\n", |
1815 | config_item_name(®->hr_item), reg->hr_dev_name); | |
18c50cb0 | 1816 | |
2903ff01 AV |
1817 | out3: |
1818 | iput(inode); | |
1819 | out2: | |
1820 | fdput(f); | |
a7f6a5fb | 1821 | out: |
a7f6a5fb MF |
1822 | if (ret < 0) { |
1823 | if (reg->hr_bdev) { | |
9a1c3542 | 1824 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
1825 | reg->hr_bdev = NULL; |
1826 | } | |
1827 | } | |
1828 | return ret; | |
1829 | } | |
1830 | ||
92efc152 ZW |
1831 | static ssize_t o2hb_region_pid_read(struct o2hb_region *reg, |
1832 | char *page) | |
1833 | { | |
e6c352db JB |
1834 | pid_t pid = 0; |
1835 | ||
1836 | spin_lock(&o2hb_live_lock); | |
1837 | if (reg->hr_task) | |
ba25f9dc | 1838 | pid = task_pid_nr(reg->hr_task); |
e6c352db JB |
1839 | spin_unlock(&o2hb_live_lock); |
1840 | ||
1841 | if (!pid) | |
92efc152 ZW |
1842 | return 0; |
1843 | ||
e6c352db | 1844 | return sprintf(page, "%u\n", pid); |
92efc152 ZW |
1845 | } |
1846 | ||
a7f6a5fb MF |
1847 | struct o2hb_region_attribute { |
1848 | struct configfs_attribute attr; | |
1849 | ssize_t (*show)(struct o2hb_region *, char *); | |
1850 | ssize_t (*store)(struct o2hb_region *, const char *, size_t); | |
1851 | }; | |
1852 | ||
1853 | static struct o2hb_region_attribute o2hb_region_attr_block_bytes = { | |
1854 | .attr = { .ca_owner = THIS_MODULE, | |
1855 | .ca_name = "block_bytes", | |
1856 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1857 | .show = o2hb_region_block_bytes_read, | |
1858 | .store = o2hb_region_block_bytes_write, | |
1859 | }; | |
1860 | ||
1861 | static struct o2hb_region_attribute o2hb_region_attr_start_block = { | |
1862 | .attr = { .ca_owner = THIS_MODULE, | |
1863 | .ca_name = "start_block", | |
1864 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1865 | .show = o2hb_region_start_block_read, | |
1866 | .store = o2hb_region_start_block_write, | |
1867 | }; | |
1868 | ||
1869 | static struct o2hb_region_attribute o2hb_region_attr_blocks = { | |
1870 | .attr = { .ca_owner = THIS_MODULE, | |
1871 | .ca_name = "blocks", | |
1872 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1873 | .show = o2hb_region_blocks_read, | |
1874 | .store = o2hb_region_blocks_write, | |
1875 | }; | |
1876 | ||
1877 | static struct o2hb_region_attribute o2hb_region_attr_dev = { | |
1878 | .attr = { .ca_owner = THIS_MODULE, | |
1879 | .ca_name = "dev", | |
1880 | .ca_mode = S_IRUGO | S_IWUSR }, | |
1881 | .show = o2hb_region_dev_read, | |
1882 | .store = o2hb_region_dev_write, | |
1883 | }; | |
1884 | ||
92efc152 ZW |
1885 | static struct o2hb_region_attribute o2hb_region_attr_pid = { |
1886 | .attr = { .ca_owner = THIS_MODULE, | |
1887 | .ca_name = "pid", | |
1888 | .ca_mode = S_IRUGO | S_IRUSR }, | |
1889 | .show = o2hb_region_pid_read, | |
1890 | }; | |
1891 | ||
a7f6a5fb MF |
1892 | static struct configfs_attribute *o2hb_region_attrs[] = { |
1893 | &o2hb_region_attr_block_bytes.attr, | |
1894 | &o2hb_region_attr_start_block.attr, | |
1895 | &o2hb_region_attr_blocks.attr, | |
1896 | &o2hb_region_attr_dev.attr, | |
92efc152 | 1897 | &o2hb_region_attr_pid.attr, |
a7f6a5fb MF |
1898 | NULL, |
1899 | }; | |
1900 | ||
1901 | static ssize_t o2hb_region_show(struct config_item *item, | |
1902 | struct configfs_attribute *attr, | |
1903 | char *page) | |
1904 | { | |
1905 | struct o2hb_region *reg = to_o2hb_region(item); | |
1906 | struct o2hb_region_attribute *o2hb_region_attr = | |
1907 | container_of(attr, struct o2hb_region_attribute, attr); | |
1908 | ssize_t ret = 0; | |
1909 | ||
1910 | if (o2hb_region_attr->show) | |
1911 | ret = o2hb_region_attr->show(reg, page); | |
1912 | return ret; | |
1913 | } | |
1914 | ||
1915 | static ssize_t o2hb_region_store(struct config_item *item, | |
1916 | struct configfs_attribute *attr, | |
1917 | const char *page, size_t count) | |
1918 | { | |
1919 | struct o2hb_region *reg = to_o2hb_region(item); | |
1920 | struct o2hb_region_attribute *o2hb_region_attr = | |
1921 | container_of(attr, struct o2hb_region_attribute, attr); | |
1922 | ssize_t ret = -EINVAL; | |
1923 | ||
1924 | if (o2hb_region_attr->store) | |
1925 | ret = o2hb_region_attr->store(reg, page, count); | |
1926 | return ret; | |
1927 | } | |
1928 | ||
1929 | static struct configfs_item_operations o2hb_region_item_ops = { | |
1930 | .release = o2hb_region_release, | |
1931 | .show_attribute = o2hb_region_show, | |
1932 | .store_attribute = o2hb_region_store, | |
1933 | }; | |
1934 | ||
1935 | static struct config_item_type o2hb_region_type = { | |
1936 | .ct_item_ops = &o2hb_region_item_ops, | |
1937 | .ct_attrs = o2hb_region_attrs, | |
1938 | .ct_owner = THIS_MODULE, | |
1939 | }; | |
1940 | ||
1941 | /* heartbeat set */ | |
1942 | ||
1943 | struct o2hb_heartbeat_group { | |
1944 | struct config_group hs_group; | |
1945 | /* some stuff? */ | |
1946 | }; | |
1947 | ||
1948 | static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) | |
1949 | { | |
1950 | return group ? | |
1951 | container_of(group, struct o2hb_heartbeat_group, hs_group) | |
1952 | : NULL; | |
1953 | } | |
1954 | ||
1f285305 SM |
1955 | static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir) |
1956 | { | |
1957 | int ret = -ENOMEM; | |
1958 | ||
1959 | reg->hr_debug_dir = | |
1960 | debugfs_create_dir(config_item_name(®->hr_item), dir); | |
8f443e23 | 1961 | if (!reg->hr_debug_dir) { |
1f285305 SM |
1962 | mlog_errno(ret); |
1963 | goto bail; | |
1964 | } | |
1965 | ||
1966 | reg->hr_debug_livenodes = | |
1967 | o2hb_debug_create(O2HB_DEBUG_LIVENODES, | |
1968 | reg->hr_debug_dir, | |
1969 | &(reg->hr_db_livenodes), | |
1970 | sizeof(*(reg->hr_db_livenodes)), | |
1971 | O2HB_DB_TYPE_REGION_LIVENODES, | |
1972 | sizeof(reg->hr_live_node_bitmap), | |
1973 | O2NM_MAX_NODES, reg); | |
8f443e23 | 1974 | if (!reg->hr_debug_livenodes) { |
1f285305 SM |
1975 | mlog_errno(ret); |
1976 | goto bail; | |
1977 | } | |
1978 | ||
1979 | reg->hr_debug_regnum = | |
1980 | o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER, | |
1981 | reg->hr_debug_dir, | |
1982 | &(reg->hr_db_regnum), | |
1983 | sizeof(*(reg->hr_db_regnum)), | |
1984 | O2HB_DB_TYPE_REGION_NUMBER, | |
1985 | 0, O2NM_MAX_NODES, reg); | |
8f443e23 | 1986 | if (!reg->hr_debug_regnum) { |
1f285305 SM |
1987 | mlog_errno(ret); |
1988 | goto bail; | |
1989 | } | |
1990 | ||
43695d09 SM |
1991 | reg->hr_debug_elapsed_time = |
1992 | o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME, | |
1993 | reg->hr_debug_dir, | |
1994 | &(reg->hr_db_elapsed_time), | |
1995 | sizeof(*(reg->hr_db_elapsed_time)), | |
1996 | O2HB_DB_TYPE_REGION_ELAPSED_TIME, | |
1997 | 0, 0, reg); | |
8f443e23 | 1998 | if (!reg->hr_debug_elapsed_time) { |
43695d09 SM |
1999 | mlog_errno(ret); |
2000 | goto bail; | |
2001 | } | |
2002 | ||
cb0586bd SM |
2003 | reg->hr_debug_pinned = |
2004 | o2hb_debug_create(O2HB_DEBUG_REGION_PINNED, | |
2005 | reg->hr_debug_dir, | |
2006 | &(reg->hr_db_pinned), | |
2007 | sizeof(*(reg->hr_db_pinned)), | |
2008 | O2HB_DB_TYPE_REGION_PINNED, | |
2009 | 0, 0, reg); | |
8f443e23 | 2010 | if (!reg->hr_debug_pinned) { |
cb0586bd SM |
2011 | mlog_errno(ret); |
2012 | goto bail; | |
2013 | } | |
2014 | ||
8f443e23 | 2015 | ret = 0; |
1f285305 SM |
2016 | bail: |
2017 | return ret; | |
2018 | } | |
2019 | ||
f89ab861 JB |
2020 | static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, |
2021 | const char *name) | |
a7f6a5fb MF |
2022 | { |
2023 | struct o2hb_region *reg = NULL; | |
1f285305 | 2024 | int ret; |
a7f6a5fb | 2025 | |
cd861280 | 2026 | reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL); |
f89ab861 | 2027 | if (reg == NULL) |
a6795e9e | 2028 | return ERR_PTR(-ENOMEM); |
a7f6a5fb | 2029 | |
1cf257f5 JS |
2030 | if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) { |
2031 | ret = -ENAMETOOLONG; | |
2032 | goto free; | |
2033 | } | |
b3c85c4c | 2034 | |
a7f6a5fb | 2035 | spin_lock(&o2hb_live_lock); |
536f0741 SM |
2036 | reg->hr_region_num = 0; |
2037 | if (o2hb_global_heartbeat_active()) { | |
2038 | reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap, | |
2039 | O2NM_MAX_REGIONS); | |
2040 | if (reg->hr_region_num >= O2NM_MAX_REGIONS) { | |
2041 | spin_unlock(&o2hb_live_lock); | |
1cf257f5 JS |
2042 | ret = -EFBIG; |
2043 | goto free; | |
536f0741 SM |
2044 | } |
2045 | set_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2046 | } | |
a7f6a5fb MF |
2047 | list_add_tail(®->hr_all_item, &o2hb_all_regions); |
2048 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb | 2049 | |
536f0741 SM |
2050 | config_item_init_type_name(®->hr_item, name, &o2hb_region_type); |
2051 | ||
1f285305 SM |
2052 | ret = o2hb_debug_region_init(reg, o2hb_debug_dir); |
2053 | if (ret) { | |
2054 | config_item_put(®->hr_item); | |
1cf257f5 | 2055 | goto free; |
1f285305 SM |
2056 | } |
2057 | ||
a6795e9e | 2058 | return ®->hr_item; |
1cf257f5 JS |
2059 | free: |
2060 | kfree(reg); | |
2061 | return ERR_PTR(ret); | |
a7f6a5fb MF |
2062 | } |
2063 | ||
2064 | static void o2hb_heartbeat_group_drop_item(struct config_group *group, | |
2065 | struct config_item *item) | |
2066 | { | |
e6c352db | 2067 | struct task_struct *hb_task; |
a7f6a5fb | 2068 | struct o2hb_region *reg = to_o2hb_region(item); |
58a3158a | 2069 | int quorum_region = 0; |
a7f6a5fb MF |
2070 | |
2071 | /* stop the thread when the user removes the region dir */ | |
e6c352db JB |
2072 | spin_lock(&o2hb_live_lock); |
2073 | hb_task = reg->hr_task; | |
2074 | reg->hr_task = NULL; | |
58a3158a | 2075 | reg->hr_item_dropped = 1; |
e6c352db JB |
2076 | spin_unlock(&o2hb_live_lock); |
2077 | ||
2078 | if (hb_task) | |
2079 | kthread_stop(hb_task); | |
a7f6a5fb | 2080 | |
d2eece37 SM |
2081 | if (o2hb_global_heartbeat_active()) { |
2082 | spin_lock(&o2hb_live_lock); | |
2083 | clear_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2084 | clear_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
2085 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
2086 | quorum_region = 1; | |
2087 | clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
2088 | spin_unlock(&o2hb_live_lock); | |
2089 | printk(KERN_NOTICE "o2hb: Heartbeat %s on region %s (%s)\n", | |
2090 | ((atomic_read(®->hr_steady_iterations) == 0) ? | |
2091 | "stopped" : "start aborted"), config_item_name(item), | |
2092 | reg->hr_dev_name); | |
2093 | } | |
2094 | ||
e6df3a66 JB |
2095 | /* |
2096 | * If we're racing a dev_write(), we need to wake them. They will | |
2097 | * check reg->hr_task | |
2098 | */ | |
2099 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
d2eece37 | 2100 | reg->hr_aborted_start = 1; |
e6df3a66 JB |
2101 | atomic_set(®->hr_steady_iterations, 0); |
2102 | wake_up(&o2hb_steady_queue); | |
2103 | } | |
2104 | ||
a7f6a5fb | 2105 | config_item_put(item); |
58a3158a SM |
2106 | |
2107 | if (!o2hb_global_heartbeat_active() || !quorum_region) | |
2108 | return; | |
2109 | ||
2110 | /* | |
2111 | * If global heartbeat active and there are dependent users, | |
2112 | * pin all regions if quorum region count <= CUT_OFF | |
2113 | */ | |
2114 | spin_lock(&o2hb_live_lock); | |
2115 | ||
2116 | if (!o2hb_dependent_users) | |
2117 | goto unlock; | |
2118 | ||
a8f70de3 | 2119 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2120 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2121 | o2hb_region_pin(NULL); | |
2122 | ||
2123 | unlock: | |
2124 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb MF |
2125 | } |
2126 | ||
2127 | struct o2hb_heartbeat_group_attribute { | |
2128 | struct configfs_attribute attr; | |
2129 | ssize_t (*show)(struct o2hb_heartbeat_group *, char *); | |
2130 | ssize_t (*store)(struct o2hb_heartbeat_group *, const char *, size_t); | |
2131 | }; | |
2132 | ||
2133 | static ssize_t o2hb_heartbeat_group_show(struct config_item *item, | |
2134 | struct configfs_attribute *attr, | |
2135 | char *page) | |
2136 | { | |
2137 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
2138 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
2139 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
2140 | ssize_t ret = 0; | |
2141 | ||
2142 | if (o2hb_heartbeat_group_attr->show) | |
2143 | ret = o2hb_heartbeat_group_attr->show(reg, page); | |
2144 | return ret; | |
2145 | } | |
2146 | ||
2147 | static ssize_t o2hb_heartbeat_group_store(struct config_item *item, | |
2148 | struct configfs_attribute *attr, | |
2149 | const char *page, size_t count) | |
2150 | { | |
2151 | struct o2hb_heartbeat_group *reg = to_o2hb_heartbeat_group(to_config_group(item)); | |
2152 | struct o2hb_heartbeat_group_attribute *o2hb_heartbeat_group_attr = | |
2153 | container_of(attr, struct o2hb_heartbeat_group_attribute, attr); | |
2154 | ssize_t ret = -EINVAL; | |
2155 | ||
2156 | if (o2hb_heartbeat_group_attr->store) | |
2157 | ret = o2hb_heartbeat_group_attr->store(reg, page, count); | |
2158 | return ret; | |
2159 | } | |
2160 | ||
2161 | static ssize_t o2hb_heartbeat_group_threshold_show(struct o2hb_heartbeat_group *group, | |
2162 | char *page) | |
2163 | { | |
2164 | return sprintf(page, "%u\n", o2hb_dead_threshold); | |
2165 | } | |
2166 | ||
2167 | static ssize_t o2hb_heartbeat_group_threshold_store(struct o2hb_heartbeat_group *group, | |
2168 | const char *page, | |
2169 | size_t count) | |
2170 | { | |
2171 | unsigned long tmp; | |
2172 | char *p = (char *)page; | |
2173 | ||
2174 | tmp = simple_strtoul(p, &p, 10); | |
2175 | if (!p || (*p && (*p != '\n'))) | |
2176 | return -EINVAL; | |
2177 | ||
2178 | /* this will validate ranges for us. */ | |
2179 | o2hb_dead_threshold_set((unsigned int) tmp); | |
2180 | ||
2181 | return count; | |
2182 | } | |
2183 | ||
54b5187b SM |
2184 | static |
2185 | ssize_t o2hb_heartbeat_group_mode_show(struct o2hb_heartbeat_group *group, | |
2186 | char *page) | |
2187 | { | |
2188 | return sprintf(page, "%s\n", | |
2189 | o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]); | |
2190 | } | |
2191 | ||
2192 | static | |
2193 | ssize_t o2hb_heartbeat_group_mode_store(struct o2hb_heartbeat_group *group, | |
2194 | const char *page, size_t count) | |
2195 | { | |
2196 | unsigned int i; | |
2197 | int ret; | |
2198 | size_t len; | |
2199 | ||
2200 | len = (page[count - 1] == '\n') ? count - 1 : count; | |
2201 | if (!len) | |
2202 | return -EINVAL; | |
2203 | ||
2204 | for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) { | |
2bd63329 | 2205 | if (strncasecmp(page, o2hb_heartbeat_mode_desc[i], len)) |
54b5187b SM |
2206 | continue; |
2207 | ||
70f651ed | 2208 | ret = o2hb_global_heartbeat_mode_set(i); |
54b5187b | 2209 | if (!ret) |
18c50cb0 | 2210 | printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n", |
54b5187b SM |
2211 | o2hb_heartbeat_mode_desc[i]); |
2212 | return count; | |
2213 | } | |
2214 | ||
2215 | return -EINVAL; | |
2216 | ||
2217 | } | |
2218 | ||
a7f6a5fb MF |
2219 | static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_threshold = { |
2220 | .attr = { .ca_owner = THIS_MODULE, | |
2221 | .ca_name = "dead_threshold", | |
2222 | .ca_mode = S_IRUGO | S_IWUSR }, | |
2223 | .show = o2hb_heartbeat_group_threshold_show, | |
2224 | .store = o2hb_heartbeat_group_threshold_store, | |
2225 | }; | |
2226 | ||
54b5187b SM |
2227 | static struct o2hb_heartbeat_group_attribute o2hb_heartbeat_group_attr_mode = { |
2228 | .attr = { .ca_owner = THIS_MODULE, | |
2229 | .ca_name = "mode", | |
2230 | .ca_mode = S_IRUGO | S_IWUSR }, | |
2231 | .show = o2hb_heartbeat_group_mode_show, | |
2232 | .store = o2hb_heartbeat_group_mode_store, | |
2233 | }; | |
2234 | ||
a7f6a5fb MF |
2235 | static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { |
2236 | &o2hb_heartbeat_group_attr_threshold.attr, | |
54b5187b | 2237 | &o2hb_heartbeat_group_attr_mode.attr, |
a7f6a5fb MF |
2238 | NULL, |
2239 | }; | |
2240 | ||
70f651ed | 2241 | static struct configfs_item_operations o2hb_heartbeat_group_item_ops = { |
a7f6a5fb MF |
2242 | .show_attribute = o2hb_heartbeat_group_show, |
2243 | .store_attribute = o2hb_heartbeat_group_store, | |
2244 | }; | |
2245 | ||
2246 | static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { | |
2247 | .make_item = o2hb_heartbeat_group_make_item, | |
2248 | .drop_item = o2hb_heartbeat_group_drop_item, | |
2249 | }; | |
2250 | ||
2251 | static struct config_item_type o2hb_heartbeat_group_type = { | |
2252 | .ct_group_ops = &o2hb_heartbeat_group_group_ops, | |
70f651ed | 2253 | .ct_item_ops = &o2hb_heartbeat_group_item_ops, |
a7f6a5fb MF |
2254 | .ct_attrs = o2hb_heartbeat_group_attrs, |
2255 | .ct_owner = THIS_MODULE, | |
2256 | }; | |
2257 | ||
2258 | /* this is just here to avoid touching group in heartbeat.h which the | |
2259 | * entire damn world #includes */ | |
2260 | struct config_group *o2hb_alloc_hb_set(void) | |
2261 | { | |
2262 | struct o2hb_heartbeat_group *hs = NULL; | |
2263 | struct config_group *ret = NULL; | |
2264 | ||
cd861280 | 2265 | hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); |
a7f6a5fb MF |
2266 | if (hs == NULL) |
2267 | goto out; | |
2268 | ||
2269 | config_group_init_type_name(&hs->hs_group, "heartbeat", | |
2270 | &o2hb_heartbeat_group_type); | |
2271 | ||
2272 | ret = &hs->hs_group; | |
2273 | out: | |
2274 | if (ret == NULL) | |
2275 | kfree(hs); | |
2276 | return ret; | |
2277 | } | |
2278 | ||
2279 | void o2hb_free_hb_set(struct config_group *group) | |
2280 | { | |
2281 | struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); | |
2282 | kfree(hs); | |
2283 | } | |
2284 | ||
25985edc | 2285 | /* hb callback registration and issuing */ |
a7f6a5fb MF |
2286 | |
2287 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) | |
2288 | { | |
2289 | if (type == O2HB_NUM_CB) | |
2290 | return ERR_PTR(-EINVAL); | |
2291 | ||
2292 | return &o2hb_callbacks[type]; | |
2293 | } | |
2294 | ||
2295 | void o2hb_setup_callback(struct o2hb_callback_func *hc, | |
2296 | enum o2hb_callback_type type, | |
2297 | o2hb_cb_func *func, | |
2298 | void *data, | |
2299 | int priority) | |
2300 | { | |
2301 | INIT_LIST_HEAD(&hc->hc_item); | |
2302 | hc->hc_func = func; | |
2303 | hc->hc_data = data; | |
2304 | hc->hc_priority = priority; | |
2305 | hc->hc_type = type; | |
2306 | hc->hc_magic = O2HB_CB_MAGIC; | |
2307 | } | |
2308 | EXPORT_SYMBOL_GPL(o2hb_setup_callback); | |
2309 | ||
58a3158a SM |
2310 | /* |
2311 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2312 | * In global heartbeat mode, region_uuid passed is NULL. | |
2313 | * | |
2314 | * In local, we only pin the matching region. In global we pin all the active | |
2315 | * regions. | |
2316 | */ | |
2317 | static int o2hb_region_pin(const char *region_uuid) | |
14829422 | 2318 | { |
58a3158a SM |
2319 | int ret = 0, found = 0; |
2320 | struct o2hb_region *reg; | |
2321 | char *uuid; | |
14829422 JB |
2322 | |
2323 | assert_spin_locked(&o2hb_live_lock); | |
2324 | ||
58a3158a | 2325 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2326 | if (reg->hr_item_dropped) |
2327 | continue; | |
2328 | ||
58a3158a SM |
2329 | uuid = config_item_name(®->hr_item); |
2330 | ||
2331 | /* local heartbeat */ | |
2332 | if (region_uuid) { | |
2333 | if (strcmp(region_uuid, uuid)) | |
2334 | continue; | |
2335 | found = 1; | |
14829422 | 2336 | } |
58a3158a SM |
2337 | |
2338 | if (reg->hr_item_pinned || reg->hr_item_dropped) | |
2339 | goto skip_pin; | |
2340 | ||
2341 | /* Ignore ENOENT only for local hb (userdlm domain) */ | |
2342 | ret = o2nm_depend_item(®->hr_item); | |
2343 | if (!ret) { | |
2344 | mlog(ML_CLUSTER, "Pin region %s\n", uuid); | |
2345 | reg->hr_item_pinned = 1; | |
2346 | } else { | |
2347 | if (ret == -ENOENT && found) | |
2348 | ret = 0; | |
2349 | else { | |
2350 | mlog(ML_ERROR, "Pin region %s fails with %d\n", | |
2351 | uuid, ret); | |
2352 | break; | |
2353 | } | |
14829422 | 2354 | } |
58a3158a SM |
2355 | skip_pin: |
2356 | if (found) | |
2357 | break; | |
14829422 JB |
2358 | } |
2359 | ||
58a3158a | 2360 | return ret; |
14829422 JB |
2361 | } |
2362 | ||
58a3158a SM |
2363 | /* |
2364 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2365 | * In global heartbeat mode, region_uuid passed is NULL. | |
2366 | * | |
2367 | * In local, we only unpin the matching region. In global we unpin all the | |
2368 | * active regions. | |
2369 | */ | |
2370 | static void o2hb_region_unpin(const char *region_uuid) | |
14829422 | 2371 | { |
14829422 | 2372 | struct o2hb_region *reg; |
58a3158a SM |
2373 | char *uuid; |
2374 | int found = 0; | |
14829422 | 2375 | |
58a3158a | 2376 | assert_spin_locked(&o2hb_live_lock); |
14829422 | 2377 | |
58a3158a | 2378 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2379 | if (reg->hr_item_dropped) |
2380 | continue; | |
2381 | ||
58a3158a SM |
2382 | uuid = config_item_name(®->hr_item); |
2383 | if (region_uuid) { | |
2384 | if (strcmp(region_uuid, uuid)) | |
2385 | continue; | |
2386 | found = 1; | |
2387 | } | |
14829422 | 2388 | |
58a3158a SM |
2389 | if (reg->hr_item_pinned) { |
2390 | mlog(ML_CLUSTER, "Unpin region %s\n", uuid); | |
2391 | o2nm_undepend_item(®->hr_item); | |
2392 | reg->hr_item_pinned = 0; | |
2393 | } | |
2394 | if (found) | |
2395 | break; | |
2396 | } | |
2397 | } | |
16c6a4f2 | 2398 | |
58a3158a SM |
2399 | static int o2hb_region_inc_user(const char *region_uuid) |
2400 | { | |
2401 | int ret = 0; | |
14829422 | 2402 | |
58a3158a | 2403 | spin_lock(&o2hb_live_lock); |
16c6a4f2 | 2404 | |
58a3158a SM |
2405 | /* local heartbeat */ |
2406 | if (!o2hb_global_heartbeat_active()) { | |
2407 | ret = o2hb_region_pin(region_uuid); | |
2408 | goto unlock; | |
2409 | } | |
2410 | ||
2411 | /* | |
2412 | * if global heartbeat active and this is the first dependent user, | |
2413 | * pin all regions if quorum region count <= CUT_OFF | |
2414 | */ | |
2415 | o2hb_dependent_users++; | |
2416 | if (o2hb_dependent_users > 1) | |
2417 | goto unlock; | |
2418 | ||
a8f70de3 | 2419 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2420 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2421 | ret = o2hb_region_pin(NULL); | |
2422 | ||
2423 | unlock: | |
2424 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2425 | return ret; |
2426 | } | |
2427 | ||
58a3158a | 2428 | void o2hb_region_dec_user(const char *region_uuid) |
14829422 | 2429 | { |
14829422 JB |
2430 | spin_lock(&o2hb_live_lock); |
2431 | ||
58a3158a SM |
2432 | /* local heartbeat */ |
2433 | if (!o2hb_global_heartbeat_active()) { | |
2434 | o2hb_region_unpin(region_uuid); | |
2435 | goto unlock; | |
2436 | } | |
14829422 | 2437 | |
58a3158a SM |
2438 | /* |
2439 | * if global heartbeat active and there are no dependent users, | |
2440 | * unpin all quorum regions | |
2441 | */ | |
2442 | o2hb_dependent_users--; | |
2443 | if (!o2hb_dependent_users) | |
2444 | o2hb_region_unpin(NULL); | |
14829422 | 2445 | |
58a3158a SM |
2446 | unlock: |
2447 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2448 | } |
2449 | ||
2450 | int o2hb_register_callback(const char *region_uuid, | |
2451 | struct o2hb_callback_func *hc) | |
a7f6a5fb | 2452 | { |
df53cd3b | 2453 | struct o2hb_callback_func *f; |
a7f6a5fb MF |
2454 | struct o2hb_callback *hbcall; |
2455 | int ret; | |
2456 | ||
2457 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2458 | BUG_ON(!list_empty(&hc->hc_item)); | |
2459 | ||
2460 | hbcall = hbcall_from_type(hc->hc_type); | |
2461 | if (IS_ERR(hbcall)) { | |
2462 | ret = PTR_ERR(hbcall); | |
2463 | goto out; | |
2464 | } | |
2465 | ||
14829422 | 2466 | if (region_uuid) { |
58a3158a SM |
2467 | ret = o2hb_region_inc_user(region_uuid); |
2468 | if (ret) { | |
2469 | mlog_errno(ret); | |
14829422 | 2470 | goto out; |
58a3158a | 2471 | } |
14829422 JB |
2472 | } |
2473 | ||
a7f6a5fb MF |
2474 | down_write(&o2hb_callback_sem); |
2475 | ||
df53cd3b DF |
2476 | list_for_each_entry(f, &hbcall->list, hc_item) { |
2477 | if (hc->hc_priority < f->hc_priority) { | |
2478 | list_add_tail(&hc->hc_item, &f->hc_item); | |
a7f6a5fb MF |
2479 | break; |
2480 | } | |
2481 | } | |
2482 | if (list_empty(&hc->hc_item)) | |
2483 | list_add_tail(&hc->hc_item, &hbcall->list); | |
2484 | ||
2485 | up_write(&o2hb_callback_sem); | |
2486 | ret = 0; | |
2487 | out: | |
58a3158a | 2488 | mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2489 | ret, __builtin_return_address(0), hc); |
2490 | return ret; | |
2491 | } | |
2492 | EXPORT_SYMBOL_GPL(o2hb_register_callback); | |
2493 | ||
14829422 JB |
2494 | void o2hb_unregister_callback(const char *region_uuid, |
2495 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
2496 | { |
2497 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2498 | ||
58a3158a | 2499 | mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2500 | __builtin_return_address(0), hc); |
2501 | ||
14829422 | 2502 | /* XXX Can this happen _with_ a region reference? */ |
a7f6a5fb | 2503 | if (list_empty(&hc->hc_item)) |
c24f72cc | 2504 | return; |
a7f6a5fb | 2505 | |
14829422 | 2506 | if (region_uuid) |
58a3158a | 2507 | o2hb_region_dec_user(region_uuid); |
14829422 | 2508 | |
a7f6a5fb MF |
2509 | down_write(&o2hb_callback_sem); |
2510 | ||
2511 | list_del_init(&hc->hc_item); | |
2512 | ||
2513 | up_write(&o2hb_callback_sem); | |
a7f6a5fb MF |
2514 | } |
2515 | EXPORT_SYMBOL_GPL(o2hb_unregister_callback); | |
2516 | ||
2517 | int o2hb_check_node_heartbeating(u8 node_num) | |
2518 | { | |
2519 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2520 | ||
2521 | o2hb_fill_node_map(testing_map, sizeof(testing_map)); | |
2522 | if (!test_bit(node_num, testing_map)) { | |
2523 | mlog(ML_HEARTBEAT, | |
2524 | "node (%u) does not have heartbeating enabled.\n", | |
2525 | node_num); | |
2526 | return 0; | |
2527 | } | |
2528 | ||
2529 | return 1; | |
2530 | } | |
2531 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating); | |
2532 | ||
70e82a12 JQ |
2533 | int o2hb_check_node_heartbeating_no_sem(u8 node_num) |
2534 | { | |
2535 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2536 | unsigned long flags; | |
2537 | ||
2538 | spin_lock_irqsave(&o2hb_live_lock, flags); | |
2539 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); | |
2540 | spin_unlock_irqrestore(&o2hb_live_lock, flags); | |
2541 | if (!test_bit(node_num, testing_map)) { | |
2542 | mlog(ML_HEARTBEAT, | |
2543 | "node (%u) does not have heartbeating enabled.\n", | |
2544 | node_num); | |
2545 | return 0; | |
2546 | } | |
2547 | ||
2548 | return 1; | |
2549 | } | |
2550 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_no_sem); | |
2551 | ||
a7f6a5fb MF |
2552 | int o2hb_check_node_heartbeating_from_callback(u8 node_num) |
2553 | { | |
2554 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2555 | ||
2556 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); | |
2557 | if (!test_bit(node_num, testing_map)) { | |
2558 | mlog(ML_HEARTBEAT, | |
2559 | "node (%u) does not have heartbeating enabled.\n", | |
2560 | node_num); | |
2561 | return 0; | |
2562 | } | |
2563 | ||
2564 | return 1; | |
2565 | } | |
2566 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); | |
2567 | ||
2568 | /* Makes sure our local node is configured with a node number, and is | |
2569 | * heartbeating. */ | |
2570 | int o2hb_check_local_node_heartbeating(void) | |
2571 | { | |
2572 | u8 node_num; | |
2573 | ||
2574 | /* if this node was set then we have networking */ | |
2575 | node_num = o2nm_this_node(); | |
2576 | if (node_num == O2NM_MAX_NODES) { | |
2577 | mlog(ML_HEARTBEAT, "this node has not been configured.\n"); | |
2578 | return 0; | |
2579 | } | |
2580 | ||
2581 | return o2hb_check_node_heartbeating(node_num); | |
2582 | } | |
2583 | EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating); | |
2584 | ||
2585 | /* | |
2586 | * this is just a hack until we get the plumbing which flips file systems | |
2587 | * read only and drops the hb ref instead of killing the node dead. | |
2588 | */ | |
2589 | void o2hb_stop_all_regions(void) | |
2590 | { | |
2591 | struct o2hb_region *reg; | |
2592 | ||
2593 | mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); | |
2594 | ||
2595 | spin_lock(&o2hb_live_lock); | |
2596 | ||
2597 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) | |
2598 | reg->hr_unclean_stop = 1; | |
2599 | ||
2600 | spin_unlock(&o2hb_live_lock); | |
2601 | } | |
2602 | EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); | |
b3c85c4c SM |
2603 | |
2604 | int o2hb_get_all_regions(char *region_uuids, u8 max_regions) | |
2605 | { | |
2606 | struct o2hb_region *reg; | |
2607 | int numregs = 0; | |
2608 | char *p; | |
2609 | ||
2610 | spin_lock(&o2hb_live_lock); | |
2611 | ||
2612 | p = region_uuids; | |
2613 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { | |
4a184b4f X |
2614 | if (reg->hr_item_dropped) |
2615 | continue; | |
2616 | ||
b3c85c4c SM |
2617 | mlog(0, "Region: %s\n", config_item_name(®->hr_item)); |
2618 | if (numregs < max_regions) { | |
2619 | memcpy(p, config_item_name(®->hr_item), | |
2620 | O2HB_MAX_REGION_NAME_LEN); | |
2621 | p += O2HB_MAX_REGION_NAME_LEN; | |
2622 | } | |
2623 | numregs++; | |
2624 | } | |
2625 | ||
2626 | spin_unlock(&o2hb_live_lock); | |
2627 | ||
2628 | return numregs; | |
2629 | } | |
2630 | EXPORT_SYMBOL_GPL(o2hb_get_all_regions); | |
2631 | ||
2632 | int o2hb_global_heartbeat_active(void) | |
2633 | { | |
4d94aa1b | 2634 | return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL); |
b3c85c4c SM |
2635 | } |
2636 | EXPORT_SYMBOL(o2hb_global_heartbeat_active); |