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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 | 221 | hr_item_pinned:1, |
0986fe9b JQ |
222 | hr_item_dropped:1, |
223 | hr_node_deleted:1; | |
a7f6a5fb MF |
224 | |
225 | /* protected by the hr_callback_sem */ | |
226 | struct task_struct *hr_task; | |
227 | ||
228 | unsigned int hr_blocks; | |
229 | unsigned long long hr_start_block; | |
230 | ||
231 | unsigned int hr_block_bits; | |
232 | unsigned int hr_block_bytes; | |
233 | ||
234 | unsigned int hr_slots_per_page; | |
235 | unsigned int hr_num_pages; | |
236 | ||
237 | struct page **hr_slot_data; | |
238 | struct block_device *hr_bdev; | |
239 | struct o2hb_disk_slot *hr_slots; | |
240 | ||
823a637a SM |
241 | /* live node map of this region */ |
242 | unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
536f0741 | 243 | unsigned int hr_region_num; |
823a637a | 244 | |
1f285305 SM |
245 | struct dentry *hr_debug_dir; |
246 | struct dentry *hr_debug_livenodes; | |
247 | struct dentry *hr_debug_regnum; | |
43695d09 | 248 | struct dentry *hr_debug_elapsed_time; |
cb0586bd | 249 | struct dentry *hr_debug_pinned; |
1f285305 SM |
250 | struct o2hb_debug_buf *hr_db_livenodes; |
251 | struct o2hb_debug_buf *hr_db_regnum; | |
43695d09 | 252 | struct o2hb_debug_buf *hr_db_elapsed_time; |
cb0586bd | 253 | struct o2hb_debug_buf *hr_db_pinned; |
1f285305 | 254 | |
a7f6a5fb MF |
255 | /* let the person setting up hb wait for it to return until it |
256 | * has reached a 'steady' state. This will be fixed when we have | |
257 | * a more complete api that doesn't lead to this sort of fragility. */ | |
258 | atomic_t hr_steady_iterations; | |
259 | ||
d2eece37 SM |
260 | /* terminate o2hb thread if it does not reach steady state |
261 | * (hr_steady_iterations == 0) within hr_unsteady_iterations */ | |
262 | atomic_t hr_unsteady_iterations; | |
263 | ||
a7f6a5fb MF |
264 | char hr_dev_name[BDEVNAME_SIZE]; |
265 | ||
266 | unsigned int hr_timeout_ms; | |
267 | ||
268 | /* randomized as the region goes up and down so that a node | |
269 | * recognizes a node going up and down in one iteration */ | |
270 | u64 hr_generation; | |
271 | ||
c4028958 | 272 | struct delayed_work hr_write_timeout_work; |
a7f6a5fb MF |
273 | unsigned long hr_last_timeout_start; |
274 | ||
e0cbb798 JB |
275 | /* negotiate timer, used to negotiate extending hb timeout. */ |
276 | struct delayed_work hr_nego_timeout_work; | |
277 | unsigned long hr_nego_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
278 | ||
a7f6a5fb MF |
279 | /* Used during o2hb_check_slot to hold a copy of the block |
280 | * being checked because we temporarily have to zero out the | |
281 | * crc field. */ | |
282 | struct o2hb_disk_heartbeat_block *hr_tmp_block; | |
34069b88 JB |
283 | |
284 | /* Message key for negotiate timeout message. */ | |
285 | unsigned int hr_key; | |
286 | struct list_head hr_handler_list; | |
88dbe98d JB |
287 | |
288 | /* last hb status, 0 for success, other value for error. */ | |
289 | int hr_last_hb_status; | |
a7f6a5fb MF |
290 | }; |
291 | ||
292 | struct o2hb_bio_wait_ctxt { | |
293 | atomic_t wc_num_reqs; | |
294 | struct completion wc_io_complete; | |
a9e2ae39 | 295 | int wc_error; |
a7f6a5fb MF |
296 | }; |
297 | ||
1bd12902 JB |
298 | #define O2HB_NEGO_TIMEOUT_MS (O2HB_MAX_WRITE_TIMEOUT_MS/2) |
299 | ||
34069b88 JB |
300 | enum { |
301 | O2HB_NEGO_TIMEOUT_MSG = 1, | |
e76f8237 | 302 | O2HB_NEGO_APPROVE_MSG = 2, |
34069b88 JB |
303 | }; |
304 | ||
305 | struct o2hb_nego_msg { | |
306 | u8 node_num; | |
307 | }; | |
308 | ||
c4028958 | 309 | static void o2hb_write_timeout(struct work_struct *work) |
a7f6a5fb | 310 | { |
b1c5ebfb | 311 | int failed, quorum; |
c4028958 DH |
312 | struct o2hb_region *reg = |
313 | container_of(work, struct o2hb_region, | |
314 | hr_write_timeout_work.work); | |
a7f6a5fb MF |
315 | |
316 | mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u " | |
317 | "milliseconds\n", reg->hr_dev_name, | |
2bd63216 | 318 | jiffies_to_msecs(jiffies - reg->hr_last_timeout_start)); |
b1c5ebfb SM |
319 | |
320 | if (o2hb_global_heartbeat_active()) { | |
4d548f61 | 321 | spin_lock(&o2hb_live_lock); |
b1c5ebfb SM |
322 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) |
323 | set_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
a8f70de3 | 324 | failed = bitmap_weight(o2hb_failed_region_bitmap, |
b1c5ebfb | 325 | O2NM_MAX_REGIONS); |
a8f70de3 | 326 | quorum = bitmap_weight(o2hb_quorum_region_bitmap, |
b1c5ebfb | 327 | O2NM_MAX_REGIONS); |
4d548f61 | 328 | spin_unlock(&o2hb_live_lock); |
b1c5ebfb SM |
329 | |
330 | mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n", | |
331 | quorum, failed); | |
332 | ||
333 | /* | |
334 | * Fence if the number of failed regions >= half the number | |
335 | * of quorum regions | |
336 | */ | |
337 | if ((failed << 1) < quorum) | |
338 | return; | |
339 | } | |
340 | ||
a7f6a5fb MF |
341 | o2quo_disk_timeout(); |
342 | } | |
343 | ||
e0cbb798 | 344 | static void o2hb_arm_timeout(struct o2hb_region *reg) |
a7f6a5fb | 345 | { |
d2eece37 SM |
346 | /* Arm writeout only after thread reaches steady state */ |
347 | if (atomic_read(®->hr_steady_iterations) != 0) | |
348 | return; | |
349 | ||
b31d308d TM |
350 | mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n", |
351 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
a7f6a5fb | 352 | |
b1c5ebfb SM |
353 | if (o2hb_global_heartbeat_active()) { |
354 | spin_lock(&o2hb_live_lock); | |
355 | clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
356 | spin_unlock(&o2hb_live_lock); | |
357 | } | |
a7f6a5fb | 358 | cancel_delayed_work(®->hr_write_timeout_work); |
a7f6a5fb MF |
359 | schedule_delayed_work(®->hr_write_timeout_work, |
360 | msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS)); | |
e0cbb798 JB |
361 | |
362 | cancel_delayed_work(®->hr_nego_timeout_work); | |
363 | /* negotiate timeout must be less than write timeout. */ | |
364 | schedule_delayed_work(®->hr_nego_timeout_work, | |
1bd12902 | 365 | msecs_to_jiffies(O2HB_NEGO_TIMEOUT_MS)); |
e0cbb798 | 366 | memset(reg->hr_nego_node_bitmap, 0, sizeof(reg->hr_nego_node_bitmap)); |
a7f6a5fb MF |
367 | } |
368 | ||
e0cbb798 | 369 | static void o2hb_disarm_timeout(struct o2hb_region *reg) |
a7f6a5fb | 370 | { |
9b00a818 | 371 | cancel_delayed_work_sync(®->hr_write_timeout_work); |
e0cbb798 JB |
372 | cancel_delayed_work_sync(®->hr_nego_timeout_work); |
373 | } | |
374 | ||
34069b88 JB |
375 | static int o2hb_send_nego_msg(int key, int type, u8 target) |
376 | { | |
377 | struct o2hb_nego_msg msg; | |
378 | int status, ret; | |
379 | ||
380 | msg.node_num = o2nm_this_node(); | |
381 | again: | |
382 | ret = o2net_send_message(type, key, &msg, sizeof(msg), | |
383 | target, &status); | |
384 | ||
385 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
386 | msleep(100); | |
387 | goto again; | |
388 | } | |
389 | ||
390 | return ret; | |
391 | } | |
392 | ||
e0cbb798 JB |
393 | static void o2hb_nego_timeout(struct work_struct *work) |
394 | { | |
395 | unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1bd12902 | 396 | int master_node, i, ret; |
e0cbb798 JB |
397 | struct o2hb_region *reg; |
398 | ||
399 | reg = container_of(work, struct o2hb_region, hr_nego_timeout_work.work); | |
88dbe98d JB |
400 | /* don't negotiate timeout if last hb failed since it is very |
401 | * possible io failed. Should let write timeout fence self. | |
402 | */ | |
403 | if (reg->hr_last_hb_status) | |
404 | return; | |
405 | ||
e0cbb798 JB |
406 | o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap)); |
407 | /* lowest node as master node to make negotiate decision. */ | |
408 | master_node = find_next_bit(live_node_bitmap, O2NM_MAX_NODES, 0); | |
409 | ||
410 | if (master_node == o2nm_this_node()) { | |
1bd12902 JB |
411 | if (!test_bit(master_node, reg->hr_nego_node_bitmap)) { |
412 | printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%s).\n", | |
413 | o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000, | |
414 | config_item_name(®->hr_item), reg->hr_dev_name); | |
415 | set_bit(master_node, reg->hr_nego_node_bitmap); | |
416 | } | |
e0cbb798 JB |
417 | if (memcmp(reg->hr_nego_node_bitmap, live_node_bitmap, |
418 | sizeof(reg->hr_nego_node_bitmap))) { | |
419 | /* check negotiate bitmap every second to do timeout | |
420 | * approve decision. | |
421 | */ | |
422 | schedule_delayed_work(®->hr_nego_timeout_work, | |
423 | msecs_to_jiffies(1000)); | |
424 | ||
425 | return; | |
426 | } | |
427 | ||
1bd12902 JB |
428 | printk(KERN_NOTICE "o2hb: all nodes hb write hung, maybe region %s (%s) is down.\n", |
429 | config_item_name(®->hr_item), reg->hr_dev_name); | |
e0cbb798 | 430 | /* approve negotiate timeout request. */ |
e76f8237 JB |
431 | o2hb_arm_timeout(reg); |
432 | ||
433 | i = -1; | |
434 | while ((i = find_next_bit(live_node_bitmap, | |
435 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
436 | if (i == master_node) | |
437 | continue; | |
438 | ||
1bd12902 JB |
439 | mlog(ML_HEARTBEAT, "send NEGO_APPROVE msg to node %d\n", i); |
440 | ret = o2hb_send_nego_msg(reg->hr_key, | |
e76f8237 | 441 | O2HB_NEGO_APPROVE_MSG, i); |
1bd12902 JB |
442 | if (ret) |
443 | mlog(ML_ERROR, "send NEGO_APPROVE msg to node %d fail %d\n", | |
444 | i, ret); | |
e76f8237 | 445 | } |
e0cbb798 JB |
446 | } else { |
447 | /* negotiate timeout with master node. */ | |
1bd12902 JB |
448 | printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%s), negotiate timeout with node %d.\n", |
449 | o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000, config_item_name(®->hr_item), | |
450 | reg->hr_dev_name, master_node); | |
451 | ret = o2hb_send_nego_msg(reg->hr_key, O2HB_NEGO_TIMEOUT_MSG, | |
452 | master_node); | |
453 | if (ret) | |
454 | mlog(ML_ERROR, "send NEGO_TIMEOUT msg to node %d fail %d\n", | |
455 | master_node, ret); | |
e0cbb798 | 456 | } |
34069b88 JB |
457 | } |
458 | ||
459 | static int o2hb_nego_timeout_handler(struct o2net_msg *msg, u32 len, void *data, | |
460 | void **ret_data) | |
461 | { | |
462 | struct o2hb_region *reg = data; | |
463 | struct o2hb_nego_msg *nego_msg; | |
e0cbb798 | 464 | |
34069b88 | 465 | nego_msg = (struct o2hb_nego_msg *)msg->buf; |
1bd12902 JB |
466 | printk(KERN_NOTICE "o2hb: receive negotiate timeout message from node %d on region %s (%s).\n", |
467 | nego_msg->node_num, config_item_name(®->hr_item), reg->hr_dev_name); | |
34069b88 JB |
468 | if (nego_msg->node_num < O2NM_MAX_NODES) |
469 | set_bit(nego_msg->node_num, reg->hr_nego_node_bitmap); | |
470 | else | |
471 | mlog(ML_ERROR, "got nego timeout message from bad node.\n"); | |
472 | ||
473 | return 0; | |
a7f6a5fb MF |
474 | } |
475 | ||
e76f8237 JB |
476 | static int o2hb_nego_approve_handler(struct o2net_msg *msg, u32 len, void *data, |
477 | void **ret_data) | |
478 | { | |
1bd12902 JB |
479 | struct o2hb_region *reg = data; |
480 | ||
481 | printk(KERN_NOTICE "o2hb: negotiate timeout approved by master node on region %s (%s).\n", | |
482 | config_item_name(®->hr_item), reg->hr_dev_name); | |
483 | o2hb_arm_timeout(reg); | |
e76f8237 JB |
484 | return 0; |
485 | } | |
486 | ||
b559292e | 487 | static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc) |
a7f6a5fb | 488 | { |
b559292e | 489 | atomic_set(&wc->wc_num_reqs, 1); |
a7f6a5fb | 490 | init_completion(&wc->wc_io_complete); |
a9e2ae39 | 491 | wc->wc_error = 0; |
a7f6a5fb MF |
492 | } |
493 | ||
494 | /* Used in error paths too */ | |
495 | static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc, | |
496 | unsigned int num) | |
497 | { | |
498 | /* sadly atomic_sub_and_test() isn't available on all platforms. The | |
499 | * good news is that the fast path only completes one at a time */ | |
500 | while(num--) { | |
501 | if (atomic_dec_and_test(&wc->wc_num_reqs)) { | |
502 | BUG_ON(num > 0); | |
503 | complete(&wc->wc_io_complete); | |
504 | } | |
505 | } | |
506 | } | |
507 | ||
508 | static void o2hb_wait_on_io(struct o2hb_region *reg, | |
509 | struct o2hb_bio_wait_ctxt *wc) | |
510 | { | |
b559292e | 511 | o2hb_bio_wait_dec(wc, 1); |
a7f6a5fb MF |
512 | wait_for_completion(&wc->wc_io_complete); |
513 | } | |
514 | ||
4246a0b6 | 515 | static void o2hb_bio_end_io(struct bio *bio) |
a7f6a5fb MF |
516 | { |
517 | struct o2hb_bio_wait_ctxt *wc = bio->bi_private; | |
518 | ||
4246a0b6 CH |
519 | if (bio->bi_error) { |
520 | mlog(ML_ERROR, "IO Error %d\n", bio->bi_error); | |
521 | wc->wc_error = bio->bi_error; | |
a9e2ae39 | 522 | } |
a7f6a5fb | 523 | |
a7f6a5fb | 524 | o2hb_bio_wait_dec(wc, 1); |
b559292e | 525 | bio_put(bio); |
a7f6a5fb MF |
526 | } |
527 | ||
528 | /* Setup a Bio to cover I/O against num_slots slots starting at | |
529 | * start_slot. */ | |
530 | static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, | |
531 | struct o2hb_bio_wait_ctxt *wc, | |
b559292e | 532 | unsigned int *current_slot, |
0d16dcfe MC |
533 | unsigned int max_slots, int op, |
534 | int op_flags) | |
a7f6a5fb | 535 | { |
b559292e | 536 | int len, current_page; |
a7f6a5fb MF |
537 | unsigned int vec_len, vec_start; |
538 | unsigned int bits = reg->hr_block_bits; | |
539 | unsigned int spp = reg->hr_slots_per_page; | |
b559292e | 540 | unsigned int cs = *current_slot; |
a7f6a5fb MF |
541 | struct bio *bio; |
542 | struct page *page; | |
543 | ||
a7f6a5fb MF |
544 | /* Testing has shown this allocation to take long enough under |
545 | * GFP_KERNEL that the local node can get fenced. It would be | |
546 | * nicest if we could pre-allocate these bios and avoid this | |
547 | * all together. */ | |
b559292e | 548 | bio = bio_alloc(GFP_ATOMIC, 16); |
a7f6a5fb MF |
549 | if (!bio) { |
550 | mlog(ML_ERROR, "Could not alloc slots BIO!\n"); | |
551 | bio = ERR_PTR(-ENOMEM); | |
552 | goto bail; | |
553 | } | |
554 | ||
555 | /* Must put everything in 512 byte sectors for the bio... */ | |
4f024f37 | 556 | bio->bi_iter.bi_sector = (reg->hr_start_block + cs) << (bits - 9); |
a7f6a5fb MF |
557 | bio->bi_bdev = reg->hr_bdev; |
558 | bio->bi_private = wc; | |
559 | bio->bi_end_io = o2hb_bio_end_io; | |
0d16dcfe | 560 | bio_set_op_attrs(bio, op, op_flags); |
a7f6a5fb | 561 | |
09cbfeaf | 562 | vec_start = (cs << bits) % PAGE_SIZE; |
b559292e PR |
563 | while(cs < max_slots) { |
564 | current_page = cs / spp; | |
565 | page = reg->hr_slot_data[current_page]; | |
a7f6a5fb | 566 | |
09cbfeaf KS |
567 | vec_len = min(PAGE_SIZE - vec_start, |
568 | (max_slots-cs) * (PAGE_SIZE/spp) ); | |
a7f6a5fb MF |
569 | |
570 | mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", | |
b559292e | 571 | current_page, vec_len, vec_start); |
a7f6a5fb MF |
572 | |
573 | len = bio_add_page(bio, page, vec_len, vec_start); | |
b559292e | 574 | if (len != vec_len) break; |
a7f6a5fb | 575 | |
09cbfeaf | 576 | cs += vec_len / (PAGE_SIZE/spp); |
a7f6a5fb MF |
577 | vec_start = 0; |
578 | } | |
579 | ||
580 | bail: | |
b559292e | 581 | *current_slot = cs; |
a7f6a5fb MF |
582 | return bio; |
583 | } | |
584 | ||
a7f6a5fb MF |
585 | static int o2hb_read_slots(struct o2hb_region *reg, |
586 | unsigned int max_slots) | |
587 | { | |
b559292e PR |
588 | unsigned int current_slot=0; |
589 | int status; | |
a7f6a5fb | 590 | struct o2hb_bio_wait_ctxt wc; |
a7f6a5fb MF |
591 | struct bio *bio; |
592 | ||
b559292e | 593 | o2hb_bio_wait_init(&wc); |
a7f6a5fb | 594 | |
b559292e | 595 | while(current_slot < max_slots) { |
4e49ea4a | 596 | bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots, |
0d16dcfe | 597 | REQ_OP_READ, 0); |
a7f6a5fb | 598 | if (IS_ERR(bio)) { |
a7f6a5fb MF |
599 | status = PTR_ERR(bio); |
600 | mlog_errno(status); | |
601 | goto bail_and_wait; | |
602 | } | |
a7f6a5fb | 603 | |
b559292e | 604 | atomic_inc(&wc.wc_num_reqs); |
4e49ea4a | 605 | submit_bio(bio); |
a7f6a5fb MF |
606 | } |
607 | ||
608 | status = 0; | |
609 | ||
610 | bail_and_wait: | |
611 | o2hb_wait_on_io(reg, &wc); | |
a9e2ae39 MF |
612 | if (wc.wc_error && !status) |
613 | status = wc.wc_error; | |
a7f6a5fb | 614 | |
a7f6a5fb MF |
615 | return status; |
616 | } | |
617 | ||
618 | static int o2hb_issue_node_write(struct o2hb_region *reg, | |
a7f6a5fb MF |
619 | struct o2hb_bio_wait_ctxt *write_wc) |
620 | { | |
621 | int status; | |
622 | unsigned int slot; | |
623 | struct bio *bio; | |
624 | ||
b559292e | 625 | o2hb_bio_wait_init(write_wc); |
a7f6a5fb MF |
626 | |
627 | slot = o2nm_this_node(); | |
628 | ||
0d16dcfe MC |
629 | bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1, REQ_OP_WRITE, |
630 | WRITE_SYNC); | |
a7f6a5fb MF |
631 | if (IS_ERR(bio)) { |
632 | status = PTR_ERR(bio); | |
633 | mlog_errno(status); | |
634 | goto bail; | |
635 | } | |
636 | ||
b559292e | 637 | atomic_inc(&write_wc->wc_num_reqs); |
4e49ea4a | 638 | submit_bio(bio); |
a7f6a5fb | 639 | |
a7f6a5fb MF |
640 | status = 0; |
641 | bail: | |
642 | return status; | |
643 | } | |
644 | ||
645 | static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, | |
646 | struct o2hb_disk_heartbeat_block *hb_block) | |
647 | { | |
648 | __le32 old_cksum; | |
649 | u32 ret; | |
650 | ||
651 | /* We want to compute the block crc with a 0 value in the | |
652 | * hb_cksum field. Save it off here and replace after the | |
653 | * crc. */ | |
654 | old_cksum = hb_block->hb_cksum; | |
655 | hb_block->hb_cksum = 0; | |
656 | ||
657 | ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); | |
658 | ||
659 | hb_block->hb_cksum = old_cksum; | |
660 | ||
661 | return ret; | |
662 | } | |
663 | ||
664 | static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) | |
665 | { | |
70bacbdb MF |
666 | mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, " |
667 | "cksum = 0x%x, generation 0x%llx\n", | |
668 | (long long)le64_to_cpu(hb_block->hb_seq), | |
669 | hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum), | |
670 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
671 | } |
672 | ||
673 | static int o2hb_verify_crc(struct o2hb_region *reg, | |
674 | struct o2hb_disk_heartbeat_block *hb_block) | |
675 | { | |
676 | u32 read, computed; | |
677 | ||
678 | read = le32_to_cpu(hb_block->hb_cksum); | |
679 | computed = o2hb_compute_block_crc_le(reg, hb_block); | |
680 | ||
681 | return read == computed; | |
682 | } | |
683 | ||
d2eece37 SM |
684 | /* |
685 | * Compare the slot data with what we wrote in the last iteration. | |
686 | * If the match fails, print an appropriate error message. This is to | |
687 | * detect errors like... another node hearting on the same slot, | |
688 | * flaky device that is losing writes, etc. | |
689 | * Returns 1 if check succeeds, 0 otherwise. | |
690 | */ | |
691 | static int o2hb_check_own_slot(struct o2hb_region *reg) | |
a7f6a5fb | 692 | { |
a7f6a5fb MF |
693 | struct o2hb_disk_slot *slot; |
694 | struct o2hb_disk_heartbeat_block *hb_block; | |
33c12a54 | 695 | char *errstr; |
a7f6a5fb | 696 | |
33c12a54 | 697 | slot = ®->hr_slots[o2nm_this_node()]; |
a7f6a5fb | 698 | /* Don't check on our 1st timestamp */ |
33c12a54 | 699 | if (!slot->ds_last_time) |
d2eece37 | 700 | return 0; |
a7f6a5fb | 701 | |
33c12a54 SM |
702 | hb_block = slot->ds_raw_block; |
703 | if (le64_to_cpu(hb_block->hb_seq) == slot->ds_last_time && | |
704 | le64_to_cpu(hb_block->hb_generation) == slot->ds_last_generation && | |
705 | hb_block->hb_node == slot->ds_node_num) | |
d2eece37 | 706 | return 1; |
a7f6a5fb | 707 | |
33c12a54 SM |
708 | #define ERRSTR1 "Another node is heartbeating on device" |
709 | #define ERRSTR2 "Heartbeat generation mismatch on device" | |
710 | #define ERRSTR3 "Heartbeat sequence mismatch on device" | |
711 | ||
712 | if (hb_block->hb_node != slot->ds_node_num) | |
713 | errstr = ERRSTR1; | |
714 | else if (le64_to_cpu(hb_block->hb_generation) != | |
715 | slot->ds_last_generation) | |
716 | errstr = ERRSTR2; | |
717 | else | |
718 | errstr = ERRSTR3; | |
719 | ||
720 | mlog(ML_ERROR, "%s (%s): expected(%u:0x%llx, 0x%llx), " | |
721 | "ondisk(%u:0x%llx, 0x%llx)\n", errstr, reg->hr_dev_name, | |
722 | slot->ds_node_num, (unsigned long long)slot->ds_last_generation, | |
723 | (unsigned long long)slot->ds_last_time, hb_block->hb_node, | |
724 | (unsigned long long)le64_to_cpu(hb_block->hb_generation), | |
725 | (unsigned long long)le64_to_cpu(hb_block->hb_seq)); | |
d2eece37 SM |
726 | |
727 | return 0; | |
a7f6a5fb MF |
728 | } |
729 | ||
730 | static inline void o2hb_prepare_block(struct o2hb_region *reg, | |
731 | u64 generation) | |
732 | { | |
733 | int node_num; | |
734 | u64 cputime; | |
735 | struct o2hb_disk_slot *slot; | |
736 | struct o2hb_disk_heartbeat_block *hb_block; | |
737 | ||
738 | node_num = o2nm_this_node(); | |
739 | slot = ®->hr_slots[node_num]; | |
740 | ||
741 | hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; | |
742 | memset(hb_block, 0, reg->hr_block_bytes); | |
743 | /* TODO: time stuff */ | |
744 | cputime = CURRENT_TIME.tv_sec; | |
745 | if (!cputime) | |
746 | cputime = 1; | |
747 | ||
748 | hb_block->hb_seq = cpu_to_le64(cputime); | |
749 | hb_block->hb_node = node_num; | |
750 | hb_block->hb_generation = cpu_to_le64(generation); | |
0db638f4 | 751 | hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS); |
a7f6a5fb MF |
752 | |
753 | /* This step must always happen last! */ | |
754 | hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, | |
755 | hb_block)); | |
756 | ||
70bacbdb | 757 | mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n", |
5fdf1e67 | 758 | (long long)generation, |
70bacbdb | 759 | le32_to_cpu(hb_block->hb_cksum)); |
a7f6a5fb MF |
760 | } |
761 | ||
762 | static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, | |
763 | struct o2nm_node *node, | |
764 | int idx) | |
765 | { | |
a7f6a5fb MF |
766 | struct o2hb_callback_func *f; |
767 | ||
df53cd3b | 768 | list_for_each_entry(f, &hbcall->list, hc_item) { |
a7f6a5fb MF |
769 | mlog(ML_HEARTBEAT, "calling funcs %p\n", f); |
770 | (f->hc_func)(node, idx, f->hc_data); | |
771 | } | |
772 | } | |
773 | ||
774 | /* Will run the list in order until we process the passed event */ | |
775 | static void o2hb_run_event_list(struct o2hb_node_event *queued_event) | |
776 | { | |
a7f6a5fb MF |
777 | struct o2hb_callback *hbcall; |
778 | struct o2hb_node_event *event; | |
779 | ||
a7f6a5fb MF |
780 | /* Holding callback sem assures we don't alter the callback |
781 | * lists when doing this, and serializes ourselves with other | |
782 | * processes wanting callbacks. */ | |
783 | down_write(&o2hb_callback_sem); | |
784 | ||
785 | spin_lock(&o2hb_live_lock); | |
786 | while (!list_empty(&o2hb_node_events) | |
787 | && !list_empty(&queued_event->hn_item)) { | |
788 | event = list_entry(o2hb_node_events.next, | |
789 | struct o2hb_node_event, | |
790 | hn_item); | |
791 | list_del_init(&event->hn_item); | |
792 | spin_unlock(&o2hb_live_lock); | |
793 | ||
794 | mlog(ML_HEARTBEAT, "Node %s event for %d\n", | |
795 | event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", | |
796 | event->hn_node_num); | |
797 | ||
798 | hbcall = hbcall_from_type(event->hn_event_type); | |
799 | ||
800 | /* We should *never* have gotten on to the list with a | |
801 | * bad type... This isn't something that we should try | |
802 | * to recover from. */ | |
803 | BUG_ON(IS_ERR(hbcall)); | |
804 | ||
805 | o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); | |
806 | ||
807 | spin_lock(&o2hb_live_lock); | |
808 | } | |
809 | spin_unlock(&o2hb_live_lock); | |
810 | ||
811 | up_write(&o2hb_callback_sem); | |
812 | } | |
813 | ||
814 | static void o2hb_queue_node_event(struct o2hb_node_event *event, | |
815 | enum o2hb_callback_type type, | |
816 | struct o2nm_node *node, | |
817 | int node_num) | |
818 | { | |
819 | assert_spin_locked(&o2hb_live_lock); | |
820 | ||
0e105d37 SM |
821 | BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB)); |
822 | ||
a7f6a5fb MF |
823 | event->hn_event_type = type; |
824 | event->hn_node = node; | |
825 | event->hn_node_num = node_num; | |
826 | ||
827 | mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", | |
828 | type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); | |
829 | ||
830 | list_add_tail(&event->hn_item, &o2hb_node_events); | |
831 | } | |
832 | ||
833 | static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) | |
834 | { | |
835 | struct o2hb_node_event event = | |
836 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
837 | struct o2nm_node *node; | |
6f8648e8 | 838 | int queued = 0; |
a7f6a5fb MF |
839 | |
840 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
841 | if (!node) | |
842 | return; | |
843 | ||
844 | spin_lock(&o2hb_live_lock); | |
845 | if (!list_empty(&slot->ds_live_item)) { | |
846 | mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", | |
847 | slot->ds_node_num); | |
848 | ||
849 | list_del_init(&slot->ds_live_item); | |
850 | ||
851 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
852 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
853 | ||
854 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
855 | slot->ds_node_num); | |
6f8648e8 | 856 | queued = 1; |
a7f6a5fb MF |
857 | } |
858 | } | |
859 | spin_unlock(&o2hb_live_lock); | |
860 | ||
6f8648e8 J |
861 | if (queued) |
862 | o2hb_run_event_list(&event); | |
a7f6a5fb MF |
863 | |
864 | o2nm_node_put(node); | |
865 | } | |
866 | ||
d2eece37 | 867 | static void o2hb_set_quorum_device(struct o2hb_region *reg) |
43182d2a | 868 | { |
43182d2a SM |
869 | if (!o2hb_global_heartbeat_active()) |
870 | return; | |
871 | ||
d2eece37 SM |
872 | /* Prevent race with o2hb_heartbeat_group_drop_item() */ |
873 | if (kthread_should_stop()) | |
43182d2a SM |
874 | return; |
875 | ||
d2eece37 SM |
876 | /* Tag region as quorum only after thread reaches steady state */ |
877 | if (atomic_read(®->hr_steady_iterations) != 0) | |
878 | return; | |
879 | ||
880 | spin_lock(&o2hb_live_lock); | |
881 | ||
882 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
883 | goto unlock; | |
884 | ||
43182d2a SM |
885 | /* |
886 | * A region can be added to the quorum only when it sees all | |
887 | * live nodes heartbeat on it. In other words, the region has been | |
888 | * added to all nodes. | |
889 | */ | |
890 | if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap, | |
891 | sizeof(o2hb_live_node_bitmap))) | |
d2eece37 | 892 | goto unlock; |
43182d2a | 893 | |
d2eece37 SM |
894 | printk(KERN_NOTICE "o2hb: Region %s (%s) is now a quorum device\n", |
895 | config_item_name(®->hr_item), reg->hr_dev_name); | |
43182d2a SM |
896 | |
897 | set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
58a3158a SM |
898 | |
899 | /* | |
900 | * If global heartbeat active, unpin all regions if the | |
901 | * region count > CUT_OFF | |
902 | */ | |
a8f70de3 | 903 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
904 | O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF) |
905 | o2hb_region_unpin(NULL); | |
d2eece37 SM |
906 | unlock: |
907 | spin_unlock(&o2hb_live_lock); | |
43182d2a SM |
908 | } |
909 | ||
a7f6a5fb MF |
910 | static int o2hb_check_slot(struct o2hb_region *reg, |
911 | struct o2hb_disk_slot *slot) | |
912 | { | |
913 | int changed = 0, gen_changed = 0; | |
914 | struct o2hb_node_event event = | |
915 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
916 | struct o2nm_node *node; | |
917 | struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; | |
918 | u64 cputime; | |
0db638f4 MF |
919 | unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS; |
920 | unsigned int slot_dead_ms; | |
0e105d37 | 921 | int tmp; |
6f8648e8 | 922 | int queued = 0; |
a7f6a5fb MF |
923 | |
924 | memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); | |
925 | ||
0e105d37 SM |
926 | /* |
927 | * If a node is no longer configured but is still in the livemap, we | |
928 | * may need to clear that bit from the livemap. | |
929 | */ | |
a7f6a5fb | 930 | node = o2nm_get_node_by_num(slot->ds_node_num); |
0e105d37 SM |
931 | if (!node) { |
932 | spin_lock(&o2hb_live_lock); | |
933 | tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
934 | spin_unlock(&o2hb_live_lock); | |
935 | if (!tmp) | |
936 | return 0; | |
937 | } | |
a7f6a5fb MF |
938 | |
939 | if (!o2hb_verify_crc(reg, hb_block)) { | |
940 | /* all paths from here will drop o2hb_live_lock for | |
941 | * us. */ | |
942 | spin_lock(&o2hb_live_lock); | |
943 | ||
944 | /* Don't print an error on the console in this case - | |
945 | * a freshly formatted heartbeat area will not have a | |
946 | * crc set on it. */ | |
947 | if (list_empty(&slot->ds_live_item)) | |
948 | goto out; | |
949 | ||
950 | /* The node is live but pushed out a bad crc. We | |
951 | * consider it a transient miss but don't populate any | |
952 | * other values as they may be junk. */ | |
953 | mlog(ML_ERROR, "Node %d has written a bad crc to %s\n", | |
954 | slot->ds_node_num, reg->hr_dev_name); | |
955 | o2hb_dump_slot(hb_block); | |
956 | ||
957 | slot->ds_equal_samples++; | |
958 | goto fire_callbacks; | |
959 | } | |
960 | ||
961 | /* we don't care if these wrap.. the state transitions below | |
962 | * clear at the right places */ | |
963 | cputime = le64_to_cpu(hb_block->hb_seq); | |
964 | if (slot->ds_last_time != cputime) | |
965 | slot->ds_changed_samples++; | |
966 | else | |
967 | slot->ds_equal_samples++; | |
968 | slot->ds_last_time = cputime; | |
969 | ||
970 | /* The node changed heartbeat generations. We assume this to | |
971 | * mean it dropped off but came back before we timed out. We | |
972 | * want to consider it down for the time being but don't want | |
973 | * to lose any changed_samples state we might build up to | |
974 | * considering it live again. */ | |
975 | if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { | |
976 | gen_changed = 1; | |
977 | slot->ds_equal_samples = 0; | |
70bacbdb MF |
978 | mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx " |
979 | "to 0x%llx)\n", slot->ds_node_num, | |
980 | (long long)slot->ds_last_generation, | |
981 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
982 | } |
983 | ||
984 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
985 | ||
70bacbdb MF |
986 | mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x " |
987 | "seq %llu last %llu changed %u equal %u\n", | |
988 | slot->ds_node_num, (long long)slot->ds_last_generation, | |
989 | le32_to_cpu(hb_block->hb_cksum), | |
2bd63216 | 990 | (unsigned long long)le64_to_cpu(hb_block->hb_seq), |
70bacbdb | 991 | (unsigned long long)slot->ds_last_time, slot->ds_changed_samples, |
a7f6a5fb MF |
992 | slot->ds_equal_samples); |
993 | ||
994 | spin_lock(&o2hb_live_lock); | |
995 | ||
996 | fire_callbacks: | |
997 | /* dead nodes only come to life after some number of | |
998 | * changes at any time during their dead time */ | |
999 | if (list_empty(&slot->ds_live_item) && | |
1000 | slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { | |
70bacbdb MF |
1001 | mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n", |
1002 | slot->ds_node_num, (long long)slot->ds_last_generation); | |
a7f6a5fb | 1003 | |
823a637a SM |
1004 | set_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
1005 | ||
a7f6a5fb MF |
1006 | /* first on the list generates a callback */ |
1007 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
1008 | mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes " |
1009 | "bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
1010 | set_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
1011 | ||
1012 | o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, | |
1013 | slot->ds_node_num); | |
1014 | ||
1015 | changed = 1; | |
6f8648e8 | 1016 | queued = 1; |
a7f6a5fb MF |
1017 | } |
1018 | ||
1019 | list_add_tail(&slot->ds_live_item, | |
1020 | &o2hb_live_slots[slot->ds_node_num]); | |
1021 | ||
1022 | slot->ds_equal_samples = 0; | |
0db638f4 MF |
1023 | |
1024 | /* We want to be sure that all nodes agree on the | |
1025 | * number of milliseconds before a node will be | |
1026 | * considered dead. The self-fencing timeout is | |
1027 | * computed from this value, and a discrepancy might | |
1028 | * result in heartbeat calling a node dead when it | |
1029 | * hasn't self-fenced yet. */ | |
1030 | slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms); | |
1031 | if (slot_dead_ms && slot_dead_ms != dead_ms) { | |
1032 | /* TODO: Perhaps we can fail the region here. */ | |
1033 | mlog(ML_ERROR, "Node %d on device %s has a dead count " | |
1034 | "of %u ms, but our count is %u ms.\n" | |
1035 | "Please double check your configuration values " | |
1036 | "for 'O2CB_HEARTBEAT_THRESHOLD'\n", | |
1037 | slot->ds_node_num, reg->hr_dev_name, slot_dead_ms, | |
1038 | dead_ms); | |
1039 | } | |
a7f6a5fb MF |
1040 | goto out; |
1041 | } | |
1042 | ||
1043 | /* if the list is dead, we're done.. */ | |
1044 | if (list_empty(&slot->ds_live_item)) | |
1045 | goto out; | |
1046 | ||
1047 | /* live nodes only go dead after enough consequtive missed | |
1048 | * samples.. reset the missed counter whenever we see | |
1049 | * activity */ | |
1050 | if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { | |
1051 | mlog(ML_HEARTBEAT, "Node %d left my region\n", | |
1052 | slot->ds_node_num); | |
1053 | ||
823a637a SM |
1054 | clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
1055 | ||
a7f6a5fb MF |
1056 | /* last off the live_slot generates a callback */ |
1057 | list_del_init(&slot->ds_live_item); | |
1058 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
1059 | mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live " |
1060 | "nodes bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
1061 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
1062 | ||
0e105d37 SM |
1063 | /* node can be null */ |
1064 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, | |
1065 | node, slot->ds_node_num); | |
a7f6a5fb MF |
1066 | |
1067 | changed = 1; | |
6f8648e8 | 1068 | queued = 1; |
a7f6a5fb MF |
1069 | } |
1070 | ||
1071 | /* We don't clear this because the node is still | |
1072 | * actually writing new blocks. */ | |
1073 | if (!gen_changed) | |
1074 | slot->ds_changed_samples = 0; | |
1075 | goto out; | |
1076 | } | |
1077 | if (slot->ds_changed_samples) { | |
1078 | slot->ds_changed_samples = 0; | |
1079 | slot->ds_equal_samples = 0; | |
1080 | } | |
1081 | out: | |
1082 | spin_unlock(&o2hb_live_lock); | |
1083 | ||
6f8648e8 J |
1084 | if (queued) |
1085 | o2hb_run_event_list(&event); | |
a7f6a5fb | 1086 | |
0e105d37 SM |
1087 | if (node) |
1088 | o2nm_node_put(node); | |
a7f6a5fb MF |
1089 | return changed; |
1090 | } | |
1091 | ||
518df6bd | 1092 | static int o2hb_highest_node(unsigned long *nodes, int numbits) |
a7f6a5fb | 1093 | { |
518df6bd | 1094 | return find_last_bit(nodes, numbits); |
a7f6a5fb MF |
1095 | } |
1096 | ||
a9e2ae39 | 1097 | static int o2hb_do_disk_heartbeat(struct o2hb_region *reg) |
a7f6a5fb | 1098 | { |
d2eece37 SM |
1099 | int i, ret, highest_node; |
1100 | int membership_change = 0, own_slot_ok = 0; | |
a7f6a5fb | 1101 | unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
0e105d37 | 1102 | unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
a7f6a5fb MF |
1103 | struct o2hb_bio_wait_ctxt write_wc; |
1104 | ||
a9e2ae39 MF |
1105 | ret = o2nm_configured_node_map(configured_nodes, |
1106 | sizeof(configured_nodes)); | |
1107 | if (ret) { | |
1108 | mlog_errno(ret); | |
d2eece37 | 1109 | goto bail; |
a9e2ae39 | 1110 | } |
a7f6a5fb | 1111 | |
0e105d37 SM |
1112 | /* |
1113 | * If a node is not configured but is in the livemap, we still need | |
1114 | * to read the slot so as to be able to remove it from the livemap. | |
1115 | */ | |
1116 | o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap)); | |
1117 | i = -1; | |
1118 | while ((i = find_next_bit(live_node_bitmap, | |
1119 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
1120 | set_bit(i, configured_nodes); | |
1121 | } | |
1122 | ||
a7f6a5fb MF |
1123 | highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); |
1124 | if (highest_node >= O2NM_MAX_NODES) { | |
d2eece37 SM |
1125 | mlog(ML_NOTICE, "o2hb: No configured nodes found!\n"); |
1126 | ret = -EINVAL; | |
1127 | goto bail; | |
a7f6a5fb MF |
1128 | } |
1129 | ||
1130 | /* No sense in reading the slots of nodes that don't exist | |
1131 | * yet. Of course, if the node definitions have holes in them | |
1132 | * then we're reading an empty slot anyway... Consider this | |
1133 | * best-effort. */ | |
1134 | ret = o2hb_read_slots(reg, highest_node + 1); | |
1135 | if (ret < 0) { | |
1136 | mlog_errno(ret); | |
d2eece37 | 1137 | goto bail; |
a7f6a5fb MF |
1138 | } |
1139 | ||
1140 | /* With an up to date view of the slots, we can check that no | |
1141 | * other node has been improperly configured to heartbeat in | |
1142 | * our slot. */ | |
d2eece37 | 1143 | own_slot_ok = o2hb_check_own_slot(reg); |
a7f6a5fb MF |
1144 | |
1145 | /* fill in the proper info for our next heartbeat */ | |
1146 | o2hb_prepare_block(reg, reg->hr_generation); | |
1147 | ||
b559292e | 1148 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
1149 | if (ret < 0) { |
1150 | mlog_errno(ret); | |
d2eece37 | 1151 | goto bail; |
a7f6a5fb MF |
1152 | } |
1153 | ||
1154 | i = -1; | |
33c12a54 SM |
1155 | while((i = find_next_bit(configured_nodes, |
1156 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
d2eece37 | 1157 | membership_change |= o2hb_check_slot(reg, ®->hr_slots[i]); |
a7f6a5fb MF |
1158 | } |
1159 | ||
1160 | /* | |
1161 | * We have to be sure we've advertised ourselves on disk | |
1162 | * before we can go to steady state. This ensures that | |
1163 | * people we find in our steady state have seen us. | |
1164 | */ | |
1165 | o2hb_wait_on_io(reg, &write_wc); | |
a9e2ae39 MF |
1166 | if (write_wc.wc_error) { |
1167 | /* Do not re-arm the write timeout on I/O error - we | |
1168 | * can't be sure that the new block ever made it to | |
1169 | * disk */ | |
1170 | mlog(ML_ERROR, "Write error %d on device \"%s\"\n", | |
1171 | write_wc.wc_error, reg->hr_dev_name); | |
d2eece37 SM |
1172 | ret = write_wc.wc_error; |
1173 | goto bail; | |
a9e2ae39 MF |
1174 | } |
1175 | ||
d2eece37 SM |
1176 | /* Skip disarming the timeout if own slot has stale/bad data */ |
1177 | if (own_slot_ok) { | |
1178 | o2hb_set_quorum_device(reg); | |
e0cbb798 | 1179 | o2hb_arm_timeout(reg); |
6633ca57 | 1180 | reg->hr_last_timeout_start = jiffies; |
d2eece37 | 1181 | } |
a7f6a5fb | 1182 | |
d2eece37 | 1183 | bail: |
a7f6a5fb | 1184 | /* let the person who launched us know when things are steady */ |
d2eece37 SM |
1185 | if (atomic_read(®->hr_steady_iterations) != 0) { |
1186 | if (!ret && own_slot_ok && !membership_change) { | |
1187 | if (atomic_dec_and_test(®->hr_steady_iterations)) | |
1188 | wake_up(&o2hb_steady_queue); | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
1193 | if (atomic_dec_and_test(®->hr_unsteady_iterations)) { | |
1194 | printk(KERN_NOTICE "o2hb: Unable to stabilize " | |
1195 | "heartbeart on region %s (%s)\n", | |
1196 | config_item_name(®->hr_item), | |
1197 | reg->hr_dev_name); | |
1198 | atomic_set(®->hr_steady_iterations, 0); | |
1199 | reg->hr_aborted_start = 1; | |
a7f6a5fb | 1200 | wake_up(&o2hb_steady_queue); |
d2eece37 SM |
1201 | ret = -EIO; |
1202 | } | |
a7f6a5fb | 1203 | } |
a9e2ae39 | 1204 | |
d2eece37 | 1205 | return ret; |
a7f6a5fb MF |
1206 | } |
1207 | ||
a7f6a5fb MF |
1208 | /* |
1209 | * we ride the region ref that the region dir holds. before the region | |
1210 | * dir is removed and drops it ref it will wait to tear down this | |
1211 | * thread. | |
1212 | */ | |
1213 | static int o2hb_thread(void *data) | |
1214 | { | |
1215 | int i, ret; | |
1216 | struct o2hb_region *reg = data; | |
a7f6a5fb | 1217 | struct o2hb_bio_wait_ctxt write_wc; |
40476b82 | 1218 | ktime_t before_hb, after_hb; |
a7f6a5fb MF |
1219 | unsigned int elapsed_msec; |
1220 | ||
1221 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); | |
1222 | ||
8698a745 | 1223 | set_user_nice(current, MIN_NICE); |
a7f6a5fb | 1224 | |
cfc069d3 | 1225 | /* Pin node */ |
0986fe9b JQ |
1226 | ret = o2nm_depend_this_node(); |
1227 | if (ret) { | |
1228 | mlog(ML_ERROR, "Node has been deleted, ret = %d\n", ret); | |
1229 | reg->hr_node_deleted = 1; | |
1230 | wake_up(&o2hb_steady_queue); | |
1231 | return 0; | |
1232 | } | |
cfc069d3 | 1233 | |
d2eece37 SM |
1234 | while (!kthread_should_stop() && |
1235 | !reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
a7f6a5fb | 1236 | /* We track the time spent inside |
025dfdaf | 1237 | * o2hb_do_disk_heartbeat so that we avoid more than |
a7f6a5fb MF |
1238 | * hr_timeout_ms between disk writes. On busy systems |
1239 | * this should result in a heartbeat which is less | |
1240 | * likely to time itself out. */ | |
40476b82 | 1241 | before_hb = ktime_get_real(); |
a7f6a5fb | 1242 | |
d2eece37 | 1243 | ret = o2hb_do_disk_heartbeat(reg); |
88dbe98d | 1244 | reg->hr_last_hb_status = ret; |
a7f6a5fb | 1245 | |
40476b82 TR |
1246 | after_hb = ktime_get_real(); |
1247 | ||
1248 | elapsed_msec = (unsigned int) | |
1249 | ktime_ms_delta(after_hb, before_hb); | |
a7f6a5fb | 1250 | |
b31d308d | 1251 | mlog(ML_HEARTBEAT, |
40476b82 TR |
1252 | "start = %lld, end = %lld, msec = %u, ret = %d\n", |
1253 | before_hb.tv64, after_hb.tv64, elapsed_msec, ret); | |
a7f6a5fb | 1254 | |
d2eece37 SM |
1255 | if (!kthread_should_stop() && |
1256 | elapsed_msec < reg->hr_timeout_ms) { | |
a7f6a5fb MF |
1257 | /* the kthread api has blocked signals for us so no |
1258 | * need to record the return value. */ | |
1259 | msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); | |
1260 | } | |
1261 | } | |
1262 | ||
e0cbb798 | 1263 | o2hb_disarm_timeout(reg); |
a7f6a5fb MF |
1264 | |
1265 | /* unclean stop is only used in very bad situation */ | |
1266 | for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) | |
1267 | o2hb_shutdown_slot(®->hr_slots[i]); | |
1268 | ||
1269 | /* Explicit down notification - avoid forcing the other nodes | |
1270 | * to timeout on this region when we could just as easily | |
1271 | * write a clear generation - thus indicating to them that | |
1272 | * this node has left this region. | |
d2eece37 SM |
1273 | */ |
1274 | if (!reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
1275 | o2hb_prepare_block(reg, 0); | |
1276 | ret = o2hb_issue_node_write(reg, &write_wc); | |
1277 | if (ret == 0) | |
1278 | o2hb_wait_on_io(reg, &write_wc); | |
1279 | else | |
1280 | mlog_errno(ret); | |
a7f6a5fb MF |
1281 | } |
1282 | ||
cfc069d3 SM |
1283 | /* Unpin node */ |
1284 | o2nm_undepend_this_node(); | |
a7f6a5fb | 1285 | |
d2eece37 | 1286 | mlog(ML_HEARTBEAT|ML_KTHREAD, "o2hb thread exiting\n"); |
a7f6a5fb MF |
1287 | |
1288 | return 0; | |
1289 | } | |
1290 | ||
87d3d3f3 SM |
1291 | #ifdef CONFIG_DEBUG_FS |
1292 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1293 | { | |
8ca8b0bb | 1294 | struct o2hb_debug_buf *db = inode->i_private; |
1f285305 | 1295 | struct o2hb_region *reg; |
87d3d3f3 | 1296 | unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
bb570a5d | 1297 | unsigned long lts; |
87d3d3f3 SM |
1298 | char *buf = NULL; |
1299 | int i = -1; | |
1300 | int out = 0; | |
1301 | ||
8ca8b0bb SM |
1302 | /* max_nodes should be the largest bitmap we pass here */ |
1303 | BUG_ON(sizeof(map) < db->db_size); | |
1304 | ||
87d3d3f3 SM |
1305 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
1306 | if (!buf) | |
1307 | goto bail; | |
1308 | ||
8ca8b0bb SM |
1309 | switch (db->db_type) { |
1310 | case O2HB_DB_TYPE_LIVENODES: | |
a6de0136 SM |
1311 | case O2HB_DB_TYPE_LIVEREGIONS: |
1312 | case O2HB_DB_TYPE_QUORUMREGIONS: | |
1313 | case O2HB_DB_TYPE_FAILEDREGIONS: | |
8ca8b0bb SM |
1314 | spin_lock(&o2hb_live_lock); |
1315 | memcpy(map, db->db_data, db->db_size); | |
1316 | spin_unlock(&o2hb_live_lock); | |
1317 | break; | |
87d3d3f3 | 1318 | |
1f285305 SM |
1319 | case O2HB_DB_TYPE_REGION_LIVENODES: |
1320 | spin_lock(&o2hb_live_lock); | |
1321 | reg = (struct o2hb_region *)db->db_data; | |
1322 | memcpy(map, reg->hr_live_node_bitmap, db->db_size); | |
1323 | spin_unlock(&o2hb_live_lock); | |
1324 | break; | |
1325 | ||
1326 | case O2HB_DB_TYPE_REGION_NUMBER: | |
1327 | reg = (struct o2hb_region *)db->db_data; | |
1328 | out += snprintf(buf + out, PAGE_SIZE - out, "%d\n", | |
1329 | reg->hr_region_num); | |
1330 | goto done; | |
1331 | ||
43695d09 SM |
1332 | case O2HB_DB_TYPE_REGION_ELAPSED_TIME: |
1333 | reg = (struct o2hb_region *)db->db_data; | |
bb570a5d SM |
1334 | lts = reg->hr_last_timeout_start; |
1335 | /* If 0, it has never been set before */ | |
1336 | if (lts) | |
1337 | lts = jiffies_to_msecs(jiffies - lts); | |
1338 | out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); | |
43695d09 SM |
1339 | goto done; |
1340 | ||
cb0586bd SM |
1341 | case O2HB_DB_TYPE_REGION_PINNED: |
1342 | reg = (struct o2hb_region *)db->db_data; | |
1343 | out += snprintf(buf + out, PAGE_SIZE - out, "%u\n", | |
1344 | !!reg->hr_item_pinned); | |
1345 | goto done; | |
1346 | ||
8ca8b0bb SM |
1347 | default: |
1348 | goto done; | |
1349 | } | |
1350 | ||
1351 | while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len) | |
87d3d3f3 SM |
1352 | out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i); |
1353 | out += snprintf(buf + out, PAGE_SIZE - out, "\n"); | |
1354 | ||
8ca8b0bb | 1355 | done: |
87d3d3f3 SM |
1356 | i_size_write(inode, out); |
1357 | ||
1358 | file->private_data = buf; | |
1359 | ||
1360 | return 0; | |
1361 | bail: | |
1362 | return -ENOMEM; | |
1363 | } | |
1364 | ||
1365 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1366 | { | |
1367 | kfree(file->private_data); | |
1368 | return 0; | |
1369 | } | |
1370 | ||
1371 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1372 | size_t nbytes, loff_t *ppos) | |
1373 | { | |
1374 | return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, | |
1375 | i_size_read(file->f_mapping->host)); | |
1376 | } | |
1377 | #else | |
1378 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1379 | { | |
1380 | return 0; | |
1381 | } | |
1382 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1383 | { | |
1384 | return 0; | |
1385 | } | |
1386 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1387 | size_t nbytes, loff_t *ppos) | |
1388 | { | |
1389 | return 0; | |
1390 | } | |
1391 | #endif /* CONFIG_DEBUG_FS */ | |
1392 | ||
828c0950 | 1393 | static const struct file_operations o2hb_debug_fops = { |
87d3d3f3 SM |
1394 | .open = o2hb_debug_open, |
1395 | .release = o2hb_debug_release, | |
1396 | .read = o2hb_debug_read, | |
1397 | .llseek = generic_file_llseek, | |
1398 | }; | |
1399 | ||
1400 | void o2hb_exit(void) | |
1401 | { | |
a6de0136 SM |
1402 | debugfs_remove(o2hb_debug_failedregions); |
1403 | debugfs_remove(o2hb_debug_quorumregions); | |
1404 | debugfs_remove(o2hb_debug_liveregions); | |
8ca8b0bb SM |
1405 | debugfs_remove(o2hb_debug_livenodes); |
1406 | debugfs_remove(o2hb_debug_dir); | |
a4a1dfa4 JQ |
1407 | kfree(o2hb_db_livenodes); |
1408 | kfree(o2hb_db_liveregions); | |
1409 | kfree(o2hb_db_quorumregions); | |
1410 | kfree(o2hb_db_failedregions); | |
8ca8b0bb SM |
1411 | } |
1412 | ||
1413 | static struct dentry *o2hb_debug_create(const char *name, struct dentry *dir, | |
1414 | struct o2hb_debug_buf **db, int db_len, | |
1415 | int type, int size, int len, void *data) | |
1416 | { | |
1417 | *db = kmalloc(db_len, GFP_KERNEL); | |
1418 | if (!*db) | |
1419 | return NULL; | |
1420 | ||
1421 | (*db)->db_type = type; | |
1422 | (*db)->db_size = size; | |
1423 | (*db)->db_len = len; | |
1424 | (*db)->db_data = data; | |
1425 | ||
1426 | return debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db, | |
1427 | &o2hb_debug_fops); | |
1428 | } | |
1429 | ||
1430 | static int o2hb_debug_init(void) | |
1431 | { | |
1432 | int ret = -ENOMEM; | |
1433 | ||
1434 | o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL); | |
8f443e23 | 1435 | if (!o2hb_debug_dir) { |
8ca8b0bb SM |
1436 | mlog_errno(ret); |
1437 | goto bail; | |
1438 | } | |
1439 | ||
1440 | o2hb_debug_livenodes = o2hb_debug_create(O2HB_DEBUG_LIVENODES, | |
1441 | o2hb_debug_dir, | |
1442 | &o2hb_db_livenodes, | |
1443 | sizeof(*o2hb_db_livenodes), | |
1444 | O2HB_DB_TYPE_LIVENODES, | |
1445 | sizeof(o2hb_live_node_bitmap), | |
1446 | O2NM_MAX_NODES, | |
1447 | o2hb_live_node_bitmap); | |
8f443e23 | 1448 | if (!o2hb_debug_livenodes) { |
8ca8b0bb SM |
1449 | mlog_errno(ret); |
1450 | goto bail; | |
1451 | } | |
a6de0136 SM |
1452 | |
1453 | o2hb_debug_liveregions = o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS, | |
1454 | o2hb_debug_dir, | |
1455 | &o2hb_db_liveregions, | |
1456 | sizeof(*o2hb_db_liveregions), | |
1457 | O2HB_DB_TYPE_LIVEREGIONS, | |
1458 | sizeof(o2hb_live_region_bitmap), | |
1459 | O2NM_MAX_REGIONS, | |
1460 | o2hb_live_region_bitmap); | |
8f443e23 | 1461 | if (!o2hb_debug_liveregions) { |
a6de0136 SM |
1462 | mlog_errno(ret); |
1463 | goto bail; | |
1464 | } | |
1465 | ||
1466 | o2hb_debug_quorumregions = | |
1467 | o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS, | |
1468 | o2hb_debug_dir, | |
1469 | &o2hb_db_quorumregions, | |
1470 | sizeof(*o2hb_db_quorumregions), | |
1471 | O2HB_DB_TYPE_QUORUMREGIONS, | |
1472 | sizeof(o2hb_quorum_region_bitmap), | |
1473 | O2NM_MAX_REGIONS, | |
1474 | o2hb_quorum_region_bitmap); | |
8f443e23 | 1475 | if (!o2hb_debug_quorumregions) { |
a6de0136 SM |
1476 | mlog_errno(ret); |
1477 | goto bail; | |
1478 | } | |
1479 | ||
1480 | o2hb_debug_failedregions = | |
1481 | o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS, | |
1482 | o2hb_debug_dir, | |
1483 | &o2hb_db_failedregions, | |
1484 | sizeof(*o2hb_db_failedregions), | |
1485 | O2HB_DB_TYPE_FAILEDREGIONS, | |
1486 | sizeof(o2hb_failed_region_bitmap), | |
1487 | O2NM_MAX_REGIONS, | |
1488 | o2hb_failed_region_bitmap); | |
8f443e23 | 1489 | if (!o2hb_debug_failedregions) { |
a6de0136 SM |
1490 | mlog_errno(ret); |
1491 | goto bail; | |
1492 | } | |
1493 | ||
8ca8b0bb SM |
1494 | ret = 0; |
1495 | bail: | |
1496 | if (ret) | |
1497 | o2hb_exit(); | |
1498 | ||
1499 | return ret; | |
87d3d3f3 SM |
1500 | } |
1501 | ||
1502 | int o2hb_init(void) | |
a7f6a5fb MF |
1503 | { |
1504 | int i; | |
1505 | ||
1506 | for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) | |
1507 | INIT_LIST_HEAD(&o2hb_callbacks[i].list); | |
1508 | ||
1509 | for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) | |
1510 | INIT_LIST_HEAD(&o2hb_live_slots[i]); | |
1511 | ||
1512 | INIT_LIST_HEAD(&o2hb_node_events); | |
1513 | ||
1514 | memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap)); | |
536f0741 | 1515 | memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap)); |
e7d656ba | 1516 | memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap)); |
43182d2a | 1517 | memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap)); |
b1c5ebfb | 1518 | memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap)); |
87d3d3f3 | 1519 | |
58a3158a SM |
1520 | o2hb_dependent_users = 0; |
1521 | ||
8ca8b0bb | 1522 | return o2hb_debug_init(); |
a7f6a5fb MF |
1523 | } |
1524 | ||
1525 | /* if we're already in a callback then we're already serialized by the sem */ | |
1526 | static void o2hb_fill_node_map_from_callback(unsigned long *map, | |
1527 | unsigned bytes) | |
1528 | { | |
1529 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); | |
1530 | ||
1531 | memcpy(map, &o2hb_live_node_bitmap, bytes); | |
1532 | } | |
1533 | ||
1534 | /* | |
1535 | * get a map of all nodes that are heartbeating in any regions | |
1536 | */ | |
1537 | void o2hb_fill_node_map(unsigned long *map, unsigned bytes) | |
1538 | { | |
1539 | /* callers want to serialize this map and callbacks so that they | |
1540 | * can trust that they don't miss nodes coming to the party */ | |
1541 | down_read(&o2hb_callback_sem); | |
1542 | spin_lock(&o2hb_live_lock); | |
1543 | o2hb_fill_node_map_from_callback(map, bytes); | |
1544 | spin_unlock(&o2hb_live_lock); | |
1545 | up_read(&o2hb_callback_sem); | |
1546 | } | |
1547 | EXPORT_SYMBOL_GPL(o2hb_fill_node_map); | |
1548 | ||
1549 | /* | |
1550 | * heartbeat configfs bits. The heartbeat set is a default set under | |
1551 | * the cluster set in nodemanager.c. | |
1552 | */ | |
1553 | ||
1554 | static struct o2hb_region *to_o2hb_region(struct config_item *item) | |
1555 | { | |
1556 | return item ? container_of(item, struct o2hb_region, hr_item) : NULL; | |
1557 | } | |
1558 | ||
1559 | /* drop_item only drops its ref after killing the thread, nothing should | |
1560 | * be using the region anymore. this has to clean up any state that | |
1561 | * attributes might have built up. */ | |
1562 | static void o2hb_region_release(struct config_item *item) | |
1563 | { | |
1564 | int i; | |
1565 | struct page *page; | |
1566 | struct o2hb_region *reg = to_o2hb_region(item); | |
1567 | ||
d2eece37 SM |
1568 | mlog(ML_HEARTBEAT, "hb region release (%s)\n", reg->hr_dev_name); |
1569 | ||
d787ab09 | 1570 | kfree(reg->hr_tmp_block); |
a7f6a5fb MF |
1571 | |
1572 | if (reg->hr_slot_data) { | |
1573 | for (i = 0; i < reg->hr_num_pages; i++) { | |
1574 | page = reg->hr_slot_data[i]; | |
1575 | if (page) | |
1576 | __free_page(page); | |
1577 | } | |
1578 | kfree(reg->hr_slot_data); | |
1579 | } | |
1580 | ||
1581 | if (reg->hr_bdev) | |
9a1c3542 | 1582 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb | 1583 | |
d787ab09 | 1584 | kfree(reg->hr_slots); |
a7f6a5fb | 1585 | |
1f285305 SM |
1586 | debugfs_remove(reg->hr_debug_livenodes); |
1587 | debugfs_remove(reg->hr_debug_regnum); | |
d4396eaf | 1588 | debugfs_remove(reg->hr_debug_elapsed_time); |
cb0586bd | 1589 | debugfs_remove(reg->hr_debug_pinned); |
1f285305 | 1590 | debugfs_remove(reg->hr_debug_dir); |
a4a1dfa4 JQ |
1591 | kfree(reg->hr_db_livenodes); |
1592 | kfree(reg->hr_db_regnum); | |
9e13f1f9 JB |
1593 | kfree(reg->hr_db_elapsed_time); |
1594 | kfree(reg->hr_db_pinned); | |
1f285305 | 1595 | |
a7f6a5fb MF |
1596 | spin_lock(&o2hb_live_lock); |
1597 | list_del(®->hr_all_item); | |
1598 | spin_unlock(&o2hb_live_lock); | |
1599 | ||
34069b88 | 1600 | o2net_unregister_handler_list(®->hr_handler_list); |
a7f6a5fb MF |
1601 | kfree(reg); |
1602 | } | |
1603 | ||
1604 | static int o2hb_read_block_input(struct o2hb_region *reg, | |
1605 | const char *page, | |
a7f6a5fb MF |
1606 | unsigned long *ret_bytes, |
1607 | unsigned int *ret_bits) | |
1608 | { | |
1609 | unsigned long bytes; | |
1610 | char *p = (char *)page; | |
1611 | ||
1612 | bytes = simple_strtoul(p, &p, 0); | |
1613 | if (!p || (*p && (*p != '\n'))) | |
1614 | return -EINVAL; | |
1615 | ||
1616 | /* Heartbeat and fs min / max block sizes are the same. */ | |
1617 | if (bytes > 4096 || bytes < 512) | |
1618 | return -ERANGE; | |
1619 | if (hweight16(bytes) != 1) | |
1620 | return -EINVAL; | |
1621 | ||
1622 | if (ret_bytes) | |
1623 | *ret_bytes = bytes; | |
1624 | if (ret_bits) | |
1625 | *ret_bits = ffs(bytes) - 1; | |
1626 | ||
1627 | return 0; | |
1628 | } | |
1629 | ||
45b99773 | 1630 | static ssize_t o2hb_region_block_bytes_show(struct config_item *item, |
a7f6a5fb MF |
1631 | char *page) |
1632 | { | |
45b99773 | 1633 | return sprintf(page, "%u\n", to_o2hb_region(item)->hr_block_bytes); |
a7f6a5fb MF |
1634 | } |
1635 | ||
45b99773 | 1636 | static ssize_t o2hb_region_block_bytes_store(struct config_item *item, |
a7f6a5fb MF |
1637 | const char *page, |
1638 | size_t count) | |
1639 | { | |
45b99773 | 1640 | struct o2hb_region *reg = to_o2hb_region(item); |
a7f6a5fb MF |
1641 | int status; |
1642 | unsigned long block_bytes; | |
1643 | unsigned int block_bits; | |
1644 | ||
1645 | if (reg->hr_bdev) | |
1646 | return -EINVAL; | |
1647 | ||
aa6913db JP |
1648 | status = o2hb_read_block_input(reg, page, &block_bytes, |
1649 | &block_bits); | |
a7f6a5fb MF |
1650 | if (status) |
1651 | return status; | |
1652 | ||
1653 | reg->hr_block_bytes = (unsigned int)block_bytes; | |
1654 | reg->hr_block_bits = block_bits; | |
1655 | ||
1656 | return count; | |
1657 | } | |
1658 | ||
45b99773 | 1659 | static ssize_t o2hb_region_start_block_show(struct config_item *item, |
a7f6a5fb MF |
1660 | char *page) |
1661 | { | |
45b99773 | 1662 | return sprintf(page, "%llu\n", to_o2hb_region(item)->hr_start_block); |
a7f6a5fb MF |
1663 | } |
1664 | ||
45b99773 | 1665 | static ssize_t o2hb_region_start_block_store(struct config_item *item, |
a7f6a5fb MF |
1666 | const char *page, |
1667 | size_t count) | |
1668 | { | |
45b99773 | 1669 | struct o2hb_region *reg = to_o2hb_region(item); |
a7f6a5fb MF |
1670 | unsigned long long tmp; |
1671 | char *p = (char *)page; | |
1672 | ||
1673 | if (reg->hr_bdev) | |
1674 | return -EINVAL; | |
1675 | ||
1676 | tmp = simple_strtoull(p, &p, 0); | |
1677 | if (!p || (*p && (*p != '\n'))) | |
1678 | return -EINVAL; | |
1679 | ||
1680 | reg->hr_start_block = tmp; | |
1681 | ||
1682 | return count; | |
1683 | } | |
1684 | ||
45b99773 | 1685 | static ssize_t o2hb_region_blocks_show(struct config_item *item, char *page) |
a7f6a5fb | 1686 | { |
45b99773 | 1687 | return sprintf(page, "%d\n", to_o2hb_region(item)->hr_blocks); |
a7f6a5fb MF |
1688 | } |
1689 | ||
45b99773 | 1690 | static ssize_t o2hb_region_blocks_store(struct config_item *item, |
a7f6a5fb MF |
1691 | const char *page, |
1692 | size_t count) | |
1693 | { | |
45b99773 | 1694 | struct o2hb_region *reg = to_o2hb_region(item); |
a7f6a5fb MF |
1695 | unsigned long tmp; |
1696 | char *p = (char *)page; | |
1697 | ||
1698 | if (reg->hr_bdev) | |
1699 | return -EINVAL; | |
1700 | ||
1701 | tmp = simple_strtoul(p, &p, 0); | |
1702 | if (!p || (*p && (*p != '\n'))) | |
1703 | return -EINVAL; | |
1704 | ||
1705 | if (tmp > O2NM_MAX_NODES || tmp == 0) | |
1706 | return -ERANGE; | |
1707 | ||
1708 | reg->hr_blocks = (unsigned int)tmp; | |
1709 | ||
1710 | return count; | |
1711 | } | |
1712 | ||
45b99773 | 1713 | static ssize_t o2hb_region_dev_show(struct config_item *item, char *page) |
a7f6a5fb MF |
1714 | { |
1715 | unsigned int ret = 0; | |
1716 | ||
45b99773 CH |
1717 | if (to_o2hb_region(item)->hr_bdev) |
1718 | ret = sprintf(page, "%s\n", to_o2hb_region(item)->hr_dev_name); | |
a7f6a5fb MF |
1719 | |
1720 | return ret; | |
1721 | } | |
1722 | ||
1723 | static void o2hb_init_region_params(struct o2hb_region *reg) | |
1724 | { | |
09cbfeaf | 1725 | reg->hr_slots_per_page = PAGE_SIZE >> reg->hr_block_bits; |
a7f6a5fb MF |
1726 | reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; |
1727 | ||
1728 | mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", | |
1729 | reg->hr_start_block, reg->hr_blocks); | |
1730 | mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", | |
1731 | reg->hr_block_bytes, reg->hr_block_bits); | |
1732 | mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); | |
1733 | mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); | |
1734 | } | |
1735 | ||
1736 | static int o2hb_map_slot_data(struct o2hb_region *reg) | |
1737 | { | |
1738 | int i, j; | |
1739 | unsigned int last_slot; | |
1740 | unsigned int spp = reg->hr_slots_per_page; | |
1741 | struct page *page; | |
1742 | char *raw; | |
1743 | struct o2hb_disk_slot *slot; | |
1744 | ||
1745 | reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); | |
372a447c | 1746 | if (reg->hr_tmp_block == NULL) |
a7f6a5fb | 1747 | return -ENOMEM; |
a7f6a5fb MF |
1748 | |
1749 | reg->hr_slots = kcalloc(reg->hr_blocks, | |
1750 | sizeof(struct o2hb_disk_slot), GFP_KERNEL); | |
372a447c | 1751 | if (reg->hr_slots == NULL) |
a7f6a5fb | 1752 | return -ENOMEM; |
a7f6a5fb MF |
1753 | |
1754 | for(i = 0; i < reg->hr_blocks; i++) { | |
1755 | slot = ®->hr_slots[i]; | |
1756 | slot->ds_node_num = i; | |
1757 | INIT_LIST_HEAD(&slot->ds_live_item); | |
1758 | slot->ds_raw_block = NULL; | |
1759 | } | |
1760 | ||
1761 | reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; | |
1762 | mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " | |
1763 | "at %u blocks per page\n", | |
1764 | reg->hr_num_pages, reg->hr_blocks, spp); | |
1765 | ||
1766 | reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), | |
1767 | GFP_KERNEL); | |
372a447c | 1768 | if (!reg->hr_slot_data) |
a7f6a5fb | 1769 | return -ENOMEM; |
a7f6a5fb MF |
1770 | |
1771 | for(i = 0; i < reg->hr_num_pages; i++) { | |
1772 | page = alloc_page(GFP_KERNEL); | |
372a447c | 1773 | if (!page) |
a7f6a5fb | 1774 | return -ENOMEM; |
a7f6a5fb MF |
1775 | |
1776 | reg->hr_slot_data[i] = page; | |
1777 | ||
1778 | last_slot = i * spp; | |
1779 | raw = page_address(page); | |
1780 | for (j = 0; | |
1781 | (j < spp) && ((j + last_slot) < reg->hr_blocks); | |
1782 | j++) { | |
1783 | BUG_ON((j + last_slot) >= reg->hr_blocks); | |
1784 | ||
1785 | slot = ®->hr_slots[j + last_slot]; | |
1786 | slot->ds_raw_block = | |
1787 | (struct o2hb_disk_heartbeat_block *) raw; | |
1788 | ||
1789 | raw += reg->hr_block_bytes; | |
1790 | } | |
1791 | } | |
1792 | ||
1793 | return 0; | |
1794 | } | |
1795 | ||
1796 | /* Read in all the slots available and populate the tracking | |
1797 | * structures so that we can start with a baseline idea of what's | |
1798 | * there. */ | |
1799 | static int o2hb_populate_slot_data(struct o2hb_region *reg) | |
1800 | { | |
1801 | int ret, i; | |
1802 | struct o2hb_disk_slot *slot; | |
1803 | struct o2hb_disk_heartbeat_block *hb_block; | |
1804 | ||
a7f6a5fb | 1805 | ret = o2hb_read_slots(reg, reg->hr_blocks); |
372a447c | 1806 | if (ret) |
a7f6a5fb | 1807 | goto out; |
a7f6a5fb MF |
1808 | |
1809 | /* We only want to get an idea of the values initially in each | |
1810 | * slot, so we do no verification - o2hb_check_slot will | |
1811 | * actually determine if each configured slot is valid and | |
1812 | * whether any values have changed. */ | |
1813 | for(i = 0; i < reg->hr_blocks; i++) { | |
1814 | slot = ®->hr_slots[i]; | |
1815 | hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; | |
1816 | ||
1817 | /* Only fill the values that o2hb_check_slot uses to | |
1818 | * determine changing slots */ | |
1819 | slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); | |
1820 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
1821 | } | |
1822 | ||
1823 | out: | |
a7f6a5fb MF |
1824 | return ret; |
1825 | } | |
1826 | ||
1827 | /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */ | |
45b99773 | 1828 | static ssize_t o2hb_region_dev_store(struct config_item *item, |
a7f6a5fb MF |
1829 | const char *page, |
1830 | size_t count) | |
1831 | { | |
45b99773 | 1832 | struct o2hb_region *reg = to_o2hb_region(item); |
e6c352db | 1833 | struct task_struct *hb_task; |
a7f6a5fb MF |
1834 | long fd; |
1835 | int sectsize; | |
1836 | char *p = (char *)page; | |
2903ff01 AV |
1837 | struct fd f; |
1838 | struct inode *inode; | |
a7f6a5fb | 1839 | ssize_t ret = -EINVAL; |
76d9fc29 | 1840 | int live_threshold; |
a7f6a5fb MF |
1841 | |
1842 | if (reg->hr_bdev) | |
1843 | goto out; | |
1844 | ||
1845 | /* We can't heartbeat without having had our node number | |
1846 | * configured yet. */ | |
1847 | if (o2nm_this_node() == O2NM_MAX_NODES) | |
1848 | goto out; | |
1849 | ||
1850 | fd = simple_strtol(p, &p, 0); | |
1851 | if (!p || (*p && (*p != '\n'))) | |
1852 | goto out; | |
1853 | ||
1854 | if (fd < 0 || fd >= INT_MAX) | |
1855 | goto out; | |
1856 | ||
2903ff01 AV |
1857 | f = fdget(fd); |
1858 | if (f.file == NULL) | |
a7f6a5fb MF |
1859 | goto out; |
1860 | ||
1861 | if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || | |
1862 | reg->hr_block_bytes == 0) | |
2903ff01 | 1863 | goto out2; |
a7f6a5fb | 1864 | |
2903ff01 | 1865 | inode = igrab(f.file->f_mapping->host); |
a7f6a5fb | 1866 | if (inode == NULL) |
2903ff01 | 1867 | goto out2; |
a7f6a5fb MF |
1868 | |
1869 | if (!S_ISBLK(inode->i_mode)) | |
2903ff01 | 1870 | goto out3; |
a7f6a5fb | 1871 | |
2903ff01 | 1872 | reg->hr_bdev = I_BDEV(f.file->f_mapping->host); |
e525fd89 | 1873 | ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, NULL); |
a7f6a5fb MF |
1874 | if (ret) { |
1875 | reg->hr_bdev = NULL; | |
2903ff01 | 1876 | goto out3; |
a7f6a5fb MF |
1877 | } |
1878 | inode = NULL; | |
1879 | ||
1880 | bdevname(reg->hr_bdev, reg->hr_dev_name); | |
1881 | ||
e1defc4f | 1882 | sectsize = bdev_logical_block_size(reg->hr_bdev); |
a7f6a5fb MF |
1883 | if (sectsize != reg->hr_block_bytes) { |
1884 | mlog(ML_ERROR, | |
1885 | "blocksize %u incorrect for device, expected %d", | |
1886 | reg->hr_block_bytes, sectsize); | |
1887 | ret = -EINVAL; | |
2903ff01 | 1888 | goto out3; |
a7f6a5fb MF |
1889 | } |
1890 | ||
1891 | o2hb_init_region_params(reg); | |
1892 | ||
1893 | /* Generation of zero is invalid */ | |
1894 | do { | |
1895 | get_random_bytes(®->hr_generation, | |
1896 | sizeof(reg->hr_generation)); | |
1897 | } while (reg->hr_generation == 0); | |
1898 | ||
1899 | ret = o2hb_map_slot_data(reg); | |
1900 | if (ret) { | |
1901 | mlog_errno(ret); | |
2903ff01 | 1902 | goto out3; |
a7f6a5fb MF |
1903 | } |
1904 | ||
1905 | ret = o2hb_populate_slot_data(reg); | |
1906 | if (ret) { | |
1907 | mlog_errno(ret); | |
2903ff01 | 1908 | goto out3; |
a7f6a5fb MF |
1909 | } |
1910 | ||
c4028958 | 1911 | INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout); |
e0cbb798 | 1912 | INIT_DELAYED_WORK(®->hr_nego_timeout_work, o2hb_nego_timeout); |
a7f6a5fb MF |
1913 | |
1914 | /* | |
1915 | * A node is considered live after it has beat LIVE_THRESHOLD | |
1916 | * times. We're not steady until we've given them a chance | |
1917 | * _after_ our first read. | |
76d9fc29 SM |
1918 | * The default threshold is bare minimum so as to limit the delay |
1919 | * during mounts. For global heartbeat, the threshold doubled for the | |
1920 | * first region. | |
a7f6a5fb | 1921 | */ |
76d9fc29 SM |
1922 | live_threshold = O2HB_LIVE_THRESHOLD; |
1923 | if (o2hb_global_heartbeat_active()) { | |
1924 | spin_lock(&o2hb_live_lock); | |
a8f70de3 | 1925 | if (bitmap_weight(o2hb_region_bitmap, O2NM_MAX_REGIONS) == 1) |
76d9fc29 SM |
1926 | live_threshold <<= 1; |
1927 | spin_unlock(&o2hb_live_lock); | |
1928 | } | |
d2eece37 SM |
1929 | ++live_threshold; |
1930 | atomic_set(®->hr_steady_iterations, live_threshold); | |
a84ac334 JB |
1931 | /* unsteady_iterations is triple the steady_iterations */ |
1932 | atomic_set(®->hr_unsteady_iterations, (live_threshold * 3)); | |
a7f6a5fb | 1933 | |
e6c352db JB |
1934 | hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s", |
1935 | reg->hr_item.ci_name); | |
1936 | if (IS_ERR(hb_task)) { | |
1937 | ret = PTR_ERR(hb_task); | |
a7f6a5fb | 1938 | mlog_errno(ret); |
2903ff01 | 1939 | goto out3; |
a7f6a5fb MF |
1940 | } |
1941 | ||
e6c352db JB |
1942 | spin_lock(&o2hb_live_lock); |
1943 | reg->hr_task = hb_task; | |
1944 | spin_unlock(&o2hb_live_lock); | |
1945 | ||
a7f6a5fb | 1946 | ret = wait_event_interruptible(o2hb_steady_queue, |
0986fe9b JQ |
1947 | atomic_read(®->hr_steady_iterations) == 0 || |
1948 | reg->hr_node_deleted); | |
a7f6a5fb | 1949 | if (ret) { |
d2eece37 SM |
1950 | atomic_set(®->hr_steady_iterations, 0); |
1951 | reg->hr_aborted_start = 1; | |
1952 | } | |
e6c352db | 1953 | |
d2eece37 SM |
1954 | if (reg->hr_aborted_start) { |
1955 | ret = -EIO; | |
2903ff01 | 1956 | goto out3; |
a7f6a5fb MF |
1957 | } |
1958 | ||
0986fe9b JQ |
1959 | if (reg->hr_node_deleted) { |
1960 | ret = -EINVAL; | |
1961 | goto out3; | |
1962 | } | |
1963 | ||
e6df3a66 JB |
1964 | /* Ok, we were woken. Make sure it wasn't by drop_item() */ |
1965 | spin_lock(&o2hb_live_lock); | |
1966 | hb_task = reg->hr_task; | |
e7d656ba SM |
1967 | if (o2hb_global_heartbeat_active()) |
1968 | set_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
e6df3a66 JB |
1969 | spin_unlock(&o2hb_live_lock); |
1970 | ||
1971 | if (hb_task) | |
1972 | ret = count; | |
1973 | else | |
1974 | ret = -EIO; | |
1975 | ||
18c50cb0 | 1976 | if (hb_task && o2hb_global_heartbeat_active()) |
d2eece37 SM |
1977 | printk(KERN_NOTICE "o2hb: Heartbeat started on region %s (%s)\n", |
1978 | config_item_name(®->hr_item), reg->hr_dev_name); | |
18c50cb0 | 1979 | |
2903ff01 AV |
1980 | out3: |
1981 | iput(inode); | |
1982 | out2: | |
1983 | fdput(f); | |
a7f6a5fb | 1984 | out: |
a7f6a5fb MF |
1985 | if (ret < 0) { |
1986 | if (reg->hr_bdev) { | |
9a1c3542 | 1987 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
1988 | reg->hr_bdev = NULL; |
1989 | } | |
1990 | } | |
1991 | return ret; | |
1992 | } | |
1993 | ||
45b99773 | 1994 | static ssize_t o2hb_region_pid_show(struct config_item *item, char *page) |
92efc152 | 1995 | { |
45b99773 | 1996 | struct o2hb_region *reg = to_o2hb_region(item); |
e6c352db JB |
1997 | pid_t pid = 0; |
1998 | ||
1999 | spin_lock(&o2hb_live_lock); | |
2000 | if (reg->hr_task) | |
ba25f9dc | 2001 | pid = task_pid_nr(reg->hr_task); |
e6c352db JB |
2002 | spin_unlock(&o2hb_live_lock); |
2003 | ||
2004 | if (!pid) | |
92efc152 ZW |
2005 | return 0; |
2006 | ||
e6c352db | 2007 | return sprintf(page, "%u\n", pid); |
92efc152 ZW |
2008 | } |
2009 | ||
45b99773 CH |
2010 | CONFIGFS_ATTR(o2hb_region_, block_bytes); |
2011 | CONFIGFS_ATTR(o2hb_region_, start_block); | |
2012 | CONFIGFS_ATTR(o2hb_region_, blocks); | |
2013 | CONFIGFS_ATTR(o2hb_region_, dev); | |
2014 | CONFIGFS_ATTR_RO(o2hb_region_, pid); | |
92efc152 | 2015 | |
a7f6a5fb | 2016 | static struct configfs_attribute *o2hb_region_attrs[] = { |
45b99773 CH |
2017 | &o2hb_region_attr_block_bytes, |
2018 | &o2hb_region_attr_start_block, | |
2019 | &o2hb_region_attr_blocks, | |
2020 | &o2hb_region_attr_dev, | |
2021 | &o2hb_region_attr_pid, | |
a7f6a5fb MF |
2022 | NULL, |
2023 | }; | |
2024 | ||
a7f6a5fb MF |
2025 | static struct configfs_item_operations o2hb_region_item_ops = { |
2026 | .release = o2hb_region_release, | |
a7f6a5fb MF |
2027 | }; |
2028 | ||
2029 | static struct config_item_type o2hb_region_type = { | |
2030 | .ct_item_ops = &o2hb_region_item_ops, | |
2031 | .ct_attrs = o2hb_region_attrs, | |
2032 | .ct_owner = THIS_MODULE, | |
2033 | }; | |
2034 | ||
2035 | /* heartbeat set */ | |
2036 | ||
2037 | struct o2hb_heartbeat_group { | |
2038 | struct config_group hs_group; | |
2039 | /* some stuff? */ | |
2040 | }; | |
2041 | ||
2042 | static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) | |
2043 | { | |
2044 | return group ? | |
2045 | container_of(group, struct o2hb_heartbeat_group, hs_group) | |
2046 | : NULL; | |
2047 | } | |
2048 | ||
1f285305 SM |
2049 | static int o2hb_debug_region_init(struct o2hb_region *reg, struct dentry *dir) |
2050 | { | |
2051 | int ret = -ENOMEM; | |
2052 | ||
2053 | reg->hr_debug_dir = | |
2054 | debugfs_create_dir(config_item_name(®->hr_item), dir); | |
8f443e23 | 2055 | if (!reg->hr_debug_dir) { |
1f285305 SM |
2056 | mlog_errno(ret); |
2057 | goto bail; | |
2058 | } | |
2059 | ||
2060 | reg->hr_debug_livenodes = | |
2061 | o2hb_debug_create(O2HB_DEBUG_LIVENODES, | |
2062 | reg->hr_debug_dir, | |
2063 | &(reg->hr_db_livenodes), | |
2064 | sizeof(*(reg->hr_db_livenodes)), | |
2065 | O2HB_DB_TYPE_REGION_LIVENODES, | |
2066 | sizeof(reg->hr_live_node_bitmap), | |
2067 | O2NM_MAX_NODES, reg); | |
8f443e23 | 2068 | if (!reg->hr_debug_livenodes) { |
1f285305 SM |
2069 | mlog_errno(ret); |
2070 | goto bail; | |
2071 | } | |
2072 | ||
2073 | reg->hr_debug_regnum = | |
2074 | o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER, | |
2075 | reg->hr_debug_dir, | |
2076 | &(reg->hr_db_regnum), | |
2077 | sizeof(*(reg->hr_db_regnum)), | |
2078 | O2HB_DB_TYPE_REGION_NUMBER, | |
2079 | 0, O2NM_MAX_NODES, reg); | |
8f443e23 | 2080 | if (!reg->hr_debug_regnum) { |
1f285305 SM |
2081 | mlog_errno(ret); |
2082 | goto bail; | |
2083 | } | |
2084 | ||
43695d09 SM |
2085 | reg->hr_debug_elapsed_time = |
2086 | o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME, | |
2087 | reg->hr_debug_dir, | |
2088 | &(reg->hr_db_elapsed_time), | |
2089 | sizeof(*(reg->hr_db_elapsed_time)), | |
2090 | O2HB_DB_TYPE_REGION_ELAPSED_TIME, | |
2091 | 0, 0, reg); | |
8f443e23 | 2092 | if (!reg->hr_debug_elapsed_time) { |
43695d09 SM |
2093 | mlog_errno(ret); |
2094 | goto bail; | |
2095 | } | |
2096 | ||
cb0586bd SM |
2097 | reg->hr_debug_pinned = |
2098 | o2hb_debug_create(O2HB_DEBUG_REGION_PINNED, | |
2099 | reg->hr_debug_dir, | |
2100 | &(reg->hr_db_pinned), | |
2101 | sizeof(*(reg->hr_db_pinned)), | |
2102 | O2HB_DB_TYPE_REGION_PINNED, | |
2103 | 0, 0, reg); | |
8f443e23 | 2104 | if (!reg->hr_debug_pinned) { |
cb0586bd SM |
2105 | mlog_errno(ret); |
2106 | goto bail; | |
2107 | } | |
2108 | ||
8f443e23 | 2109 | ret = 0; |
1f285305 SM |
2110 | bail: |
2111 | return ret; | |
2112 | } | |
2113 | ||
f89ab861 JB |
2114 | static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, |
2115 | const char *name) | |
a7f6a5fb MF |
2116 | { |
2117 | struct o2hb_region *reg = NULL; | |
1f285305 | 2118 | int ret; |
a7f6a5fb | 2119 | |
cd861280 | 2120 | reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL); |
f89ab861 | 2121 | if (reg == NULL) |
a6795e9e | 2122 | return ERR_PTR(-ENOMEM); |
a7f6a5fb | 2123 | |
1cf257f5 JS |
2124 | if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) { |
2125 | ret = -ENAMETOOLONG; | |
2126 | goto free; | |
2127 | } | |
b3c85c4c | 2128 | |
a7f6a5fb | 2129 | spin_lock(&o2hb_live_lock); |
536f0741 SM |
2130 | reg->hr_region_num = 0; |
2131 | if (o2hb_global_heartbeat_active()) { | |
2132 | reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap, | |
2133 | O2NM_MAX_REGIONS); | |
2134 | if (reg->hr_region_num >= O2NM_MAX_REGIONS) { | |
2135 | spin_unlock(&o2hb_live_lock); | |
1cf257f5 JS |
2136 | ret = -EFBIG; |
2137 | goto free; | |
536f0741 SM |
2138 | } |
2139 | set_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2140 | } | |
a7f6a5fb MF |
2141 | list_add_tail(®->hr_all_item, &o2hb_all_regions); |
2142 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb | 2143 | |
536f0741 SM |
2144 | config_item_init_type_name(®->hr_item, name, &o2hb_region_type); |
2145 | ||
34069b88 JB |
2146 | /* this is the same way to generate msg key as dlm, for local heartbeat, |
2147 | * name is also the same, so make initial crc value different to avoid | |
2148 | * message key conflict. | |
2149 | */ | |
2150 | reg->hr_key = crc32_le(reg->hr_region_num + O2NM_MAX_REGIONS, | |
2151 | name, strlen(name)); | |
2152 | INIT_LIST_HEAD(®->hr_handler_list); | |
2153 | ret = o2net_register_handler(O2HB_NEGO_TIMEOUT_MSG, reg->hr_key, | |
2154 | sizeof(struct o2hb_nego_msg), | |
2155 | o2hb_nego_timeout_handler, | |
2156 | reg, NULL, ®->hr_handler_list); | |
2157 | if (ret) | |
2158 | goto free; | |
2159 | ||
e76f8237 JB |
2160 | ret = o2net_register_handler(O2HB_NEGO_APPROVE_MSG, reg->hr_key, |
2161 | sizeof(struct o2hb_nego_msg), | |
2162 | o2hb_nego_approve_handler, | |
2163 | reg, NULL, ®->hr_handler_list); | |
2164 | if (ret) | |
2165 | goto unregister_handler; | |
2166 | ||
1f285305 SM |
2167 | ret = o2hb_debug_region_init(reg, o2hb_debug_dir); |
2168 | if (ret) { | |
2169 | config_item_put(®->hr_item); | |
34069b88 | 2170 | goto unregister_handler; |
1f285305 SM |
2171 | } |
2172 | ||
a6795e9e | 2173 | return ®->hr_item; |
34069b88 JB |
2174 | |
2175 | unregister_handler: | |
2176 | o2net_unregister_handler_list(®->hr_handler_list); | |
1cf257f5 JS |
2177 | free: |
2178 | kfree(reg); | |
2179 | return ERR_PTR(ret); | |
a7f6a5fb MF |
2180 | } |
2181 | ||
2182 | static void o2hb_heartbeat_group_drop_item(struct config_group *group, | |
2183 | struct config_item *item) | |
2184 | { | |
e6c352db | 2185 | struct task_struct *hb_task; |
a7f6a5fb | 2186 | struct o2hb_region *reg = to_o2hb_region(item); |
58a3158a | 2187 | int quorum_region = 0; |
a7f6a5fb MF |
2188 | |
2189 | /* stop the thread when the user removes the region dir */ | |
e6c352db JB |
2190 | spin_lock(&o2hb_live_lock); |
2191 | hb_task = reg->hr_task; | |
2192 | reg->hr_task = NULL; | |
58a3158a | 2193 | reg->hr_item_dropped = 1; |
e6c352db JB |
2194 | spin_unlock(&o2hb_live_lock); |
2195 | ||
2196 | if (hb_task) | |
2197 | kthread_stop(hb_task); | |
a7f6a5fb | 2198 | |
d2eece37 SM |
2199 | if (o2hb_global_heartbeat_active()) { |
2200 | spin_lock(&o2hb_live_lock); | |
2201 | clear_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2202 | clear_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
2203 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
2204 | quorum_region = 1; | |
2205 | clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
2206 | spin_unlock(&o2hb_live_lock); | |
2207 | printk(KERN_NOTICE "o2hb: Heartbeat %s on region %s (%s)\n", | |
2208 | ((atomic_read(®->hr_steady_iterations) == 0) ? | |
2209 | "stopped" : "start aborted"), config_item_name(item), | |
2210 | reg->hr_dev_name); | |
2211 | } | |
2212 | ||
e6df3a66 JB |
2213 | /* |
2214 | * If we're racing a dev_write(), we need to wake them. They will | |
2215 | * check reg->hr_task | |
2216 | */ | |
2217 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
d2eece37 | 2218 | reg->hr_aborted_start = 1; |
e6df3a66 JB |
2219 | atomic_set(®->hr_steady_iterations, 0); |
2220 | wake_up(&o2hb_steady_queue); | |
2221 | } | |
2222 | ||
a7f6a5fb | 2223 | config_item_put(item); |
58a3158a SM |
2224 | |
2225 | if (!o2hb_global_heartbeat_active() || !quorum_region) | |
2226 | return; | |
2227 | ||
2228 | /* | |
2229 | * If global heartbeat active and there are dependent users, | |
2230 | * pin all regions if quorum region count <= CUT_OFF | |
2231 | */ | |
2232 | spin_lock(&o2hb_live_lock); | |
2233 | ||
2234 | if (!o2hb_dependent_users) | |
2235 | goto unlock; | |
2236 | ||
a8f70de3 | 2237 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2238 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2239 | o2hb_region_pin(NULL); | |
2240 | ||
2241 | unlock: | |
2242 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb MF |
2243 | } |
2244 | ||
45b99773 CH |
2245 | static ssize_t o2hb_heartbeat_group_threshold_show(struct config_item *item, |
2246 | char *page) | |
a7f6a5fb MF |
2247 | { |
2248 | return sprintf(page, "%u\n", o2hb_dead_threshold); | |
2249 | } | |
2250 | ||
45b99773 CH |
2251 | static ssize_t o2hb_heartbeat_group_threshold_store(struct config_item *item, |
2252 | const char *page, size_t count) | |
a7f6a5fb MF |
2253 | { |
2254 | unsigned long tmp; | |
2255 | char *p = (char *)page; | |
2256 | ||
2257 | tmp = simple_strtoul(p, &p, 10); | |
2258 | if (!p || (*p && (*p != '\n'))) | |
2259 | return -EINVAL; | |
2260 | ||
2261 | /* this will validate ranges for us. */ | |
2262 | o2hb_dead_threshold_set((unsigned int) tmp); | |
2263 | ||
2264 | return count; | |
2265 | } | |
2266 | ||
45b99773 CH |
2267 | static ssize_t o2hb_heartbeat_group_mode_show(struct config_item *item, |
2268 | char *page) | |
54b5187b SM |
2269 | { |
2270 | return sprintf(page, "%s\n", | |
2271 | o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]); | |
2272 | } | |
2273 | ||
45b99773 CH |
2274 | static ssize_t o2hb_heartbeat_group_mode_store(struct config_item *item, |
2275 | const char *page, size_t count) | |
54b5187b SM |
2276 | { |
2277 | unsigned int i; | |
2278 | int ret; | |
2279 | size_t len; | |
2280 | ||
2281 | len = (page[count - 1] == '\n') ? count - 1 : count; | |
2282 | if (!len) | |
2283 | return -EINVAL; | |
2284 | ||
2285 | for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) { | |
2bd63329 | 2286 | if (strncasecmp(page, o2hb_heartbeat_mode_desc[i], len)) |
54b5187b SM |
2287 | continue; |
2288 | ||
70f651ed | 2289 | ret = o2hb_global_heartbeat_mode_set(i); |
54b5187b | 2290 | if (!ret) |
18c50cb0 | 2291 | printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n", |
54b5187b SM |
2292 | o2hb_heartbeat_mode_desc[i]); |
2293 | return count; | |
2294 | } | |
2295 | ||
2296 | return -EINVAL; | |
2297 | ||
2298 | } | |
2299 | ||
45b99773 CH |
2300 | CONFIGFS_ATTR(o2hb_heartbeat_group_, threshold); |
2301 | CONFIGFS_ATTR(o2hb_heartbeat_group_, mode); | |
54b5187b | 2302 | |
a7f6a5fb | 2303 | static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { |
45b99773 CH |
2304 | &o2hb_heartbeat_group_attr_threshold, |
2305 | &o2hb_heartbeat_group_attr_mode, | |
a7f6a5fb MF |
2306 | NULL, |
2307 | }; | |
2308 | ||
a7f6a5fb MF |
2309 | static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { |
2310 | .make_item = o2hb_heartbeat_group_make_item, | |
2311 | .drop_item = o2hb_heartbeat_group_drop_item, | |
2312 | }; | |
2313 | ||
2314 | static struct config_item_type o2hb_heartbeat_group_type = { | |
2315 | .ct_group_ops = &o2hb_heartbeat_group_group_ops, | |
a7f6a5fb MF |
2316 | .ct_attrs = o2hb_heartbeat_group_attrs, |
2317 | .ct_owner = THIS_MODULE, | |
2318 | }; | |
2319 | ||
2320 | /* this is just here to avoid touching group in heartbeat.h which the | |
2321 | * entire damn world #includes */ | |
2322 | struct config_group *o2hb_alloc_hb_set(void) | |
2323 | { | |
2324 | struct o2hb_heartbeat_group *hs = NULL; | |
2325 | struct config_group *ret = NULL; | |
2326 | ||
cd861280 | 2327 | hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); |
a7f6a5fb MF |
2328 | if (hs == NULL) |
2329 | goto out; | |
2330 | ||
2331 | config_group_init_type_name(&hs->hs_group, "heartbeat", | |
2332 | &o2hb_heartbeat_group_type); | |
2333 | ||
2334 | ret = &hs->hs_group; | |
2335 | out: | |
2336 | if (ret == NULL) | |
2337 | kfree(hs); | |
2338 | return ret; | |
2339 | } | |
2340 | ||
2341 | void o2hb_free_hb_set(struct config_group *group) | |
2342 | { | |
2343 | struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); | |
2344 | kfree(hs); | |
2345 | } | |
2346 | ||
25985edc | 2347 | /* hb callback registration and issuing */ |
a7f6a5fb MF |
2348 | |
2349 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) | |
2350 | { | |
2351 | if (type == O2HB_NUM_CB) | |
2352 | return ERR_PTR(-EINVAL); | |
2353 | ||
2354 | return &o2hb_callbacks[type]; | |
2355 | } | |
2356 | ||
2357 | void o2hb_setup_callback(struct o2hb_callback_func *hc, | |
2358 | enum o2hb_callback_type type, | |
2359 | o2hb_cb_func *func, | |
2360 | void *data, | |
2361 | int priority) | |
2362 | { | |
2363 | INIT_LIST_HEAD(&hc->hc_item); | |
2364 | hc->hc_func = func; | |
2365 | hc->hc_data = data; | |
2366 | hc->hc_priority = priority; | |
2367 | hc->hc_type = type; | |
2368 | hc->hc_magic = O2HB_CB_MAGIC; | |
2369 | } | |
2370 | EXPORT_SYMBOL_GPL(o2hb_setup_callback); | |
2371 | ||
58a3158a SM |
2372 | /* |
2373 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2374 | * In global heartbeat mode, region_uuid passed is NULL. | |
2375 | * | |
2376 | * In local, we only pin the matching region. In global we pin all the active | |
2377 | * regions. | |
2378 | */ | |
2379 | static int o2hb_region_pin(const char *region_uuid) | |
14829422 | 2380 | { |
58a3158a SM |
2381 | int ret = 0, found = 0; |
2382 | struct o2hb_region *reg; | |
2383 | char *uuid; | |
14829422 JB |
2384 | |
2385 | assert_spin_locked(&o2hb_live_lock); | |
2386 | ||
58a3158a | 2387 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2388 | if (reg->hr_item_dropped) |
2389 | continue; | |
2390 | ||
58a3158a SM |
2391 | uuid = config_item_name(®->hr_item); |
2392 | ||
2393 | /* local heartbeat */ | |
2394 | if (region_uuid) { | |
2395 | if (strcmp(region_uuid, uuid)) | |
2396 | continue; | |
2397 | found = 1; | |
14829422 | 2398 | } |
58a3158a SM |
2399 | |
2400 | if (reg->hr_item_pinned || reg->hr_item_dropped) | |
2401 | goto skip_pin; | |
2402 | ||
2403 | /* Ignore ENOENT only for local hb (userdlm domain) */ | |
2404 | ret = o2nm_depend_item(®->hr_item); | |
2405 | if (!ret) { | |
2406 | mlog(ML_CLUSTER, "Pin region %s\n", uuid); | |
2407 | reg->hr_item_pinned = 1; | |
2408 | } else { | |
2409 | if (ret == -ENOENT && found) | |
2410 | ret = 0; | |
2411 | else { | |
2412 | mlog(ML_ERROR, "Pin region %s fails with %d\n", | |
2413 | uuid, ret); | |
2414 | break; | |
2415 | } | |
14829422 | 2416 | } |
58a3158a SM |
2417 | skip_pin: |
2418 | if (found) | |
2419 | break; | |
14829422 JB |
2420 | } |
2421 | ||
58a3158a | 2422 | return ret; |
14829422 JB |
2423 | } |
2424 | ||
58a3158a SM |
2425 | /* |
2426 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2427 | * In global heartbeat mode, region_uuid passed is NULL. | |
2428 | * | |
2429 | * In local, we only unpin the matching region. In global we unpin all the | |
2430 | * active regions. | |
2431 | */ | |
2432 | static void o2hb_region_unpin(const char *region_uuid) | |
14829422 | 2433 | { |
14829422 | 2434 | struct o2hb_region *reg; |
58a3158a SM |
2435 | char *uuid; |
2436 | int found = 0; | |
14829422 | 2437 | |
58a3158a | 2438 | assert_spin_locked(&o2hb_live_lock); |
14829422 | 2439 | |
58a3158a | 2440 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2441 | if (reg->hr_item_dropped) |
2442 | continue; | |
2443 | ||
58a3158a SM |
2444 | uuid = config_item_name(®->hr_item); |
2445 | if (region_uuid) { | |
2446 | if (strcmp(region_uuid, uuid)) | |
2447 | continue; | |
2448 | found = 1; | |
2449 | } | |
14829422 | 2450 | |
58a3158a SM |
2451 | if (reg->hr_item_pinned) { |
2452 | mlog(ML_CLUSTER, "Unpin region %s\n", uuid); | |
2453 | o2nm_undepend_item(®->hr_item); | |
2454 | reg->hr_item_pinned = 0; | |
2455 | } | |
2456 | if (found) | |
2457 | break; | |
2458 | } | |
2459 | } | |
16c6a4f2 | 2460 | |
58a3158a SM |
2461 | static int o2hb_region_inc_user(const char *region_uuid) |
2462 | { | |
2463 | int ret = 0; | |
14829422 | 2464 | |
58a3158a | 2465 | spin_lock(&o2hb_live_lock); |
16c6a4f2 | 2466 | |
58a3158a SM |
2467 | /* local heartbeat */ |
2468 | if (!o2hb_global_heartbeat_active()) { | |
2469 | ret = o2hb_region_pin(region_uuid); | |
2470 | goto unlock; | |
2471 | } | |
2472 | ||
2473 | /* | |
2474 | * if global heartbeat active and this is the first dependent user, | |
2475 | * pin all regions if quorum region count <= CUT_OFF | |
2476 | */ | |
2477 | o2hb_dependent_users++; | |
2478 | if (o2hb_dependent_users > 1) | |
2479 | goto unlock; | |
2480 | ||
a8f70de3 | 2481 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2482 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2483 | ret = o2hb_region_pin(NULL); | |
2484 | ||
2485 | unlock: | |
2486 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2487 | return ret; |
2488 | } | |
2489 | ||
58a3158a | 2490 | void o2hb_region_dec_user(const char *region_uuid) |
14829422 | 2491 | { |
14829422 JB |
2492 | spin_lock(&o2hb_live_lock); |
2493 | ||
58a3158a SM |
2494 | /* local heartbeat */ |
2495 | if (!o2hb_global_heartbeat_active()) { | |
2496 | o2hb_region_unpin(region_uuid); | |
2497 | goto unlock; | |
2498 | } | |
14829422 | 2499 | |
58a3158a SM |
2500 | /* |
2501 | * if global heartbeat active and there are no dependent users, | |
2502 | * unpin all quorum regions | |
2503 | */ | |
2504 | o2hb_dependent_users--; | |
2505 | if (!o2hb_dependent_users) | |
2506 | o2hb_region_unpin(NULL); | |
14829422 | 2507 | |
58a3158a SM |
2508 | unlock: |
2509 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2510 | } |
2511 | ||
2512 | int o2hb_register_callback(const char *region_uuid, | |
2513 | struct o2hb_callback_func *hc) | |
a7f6a5fb | 2514 | { |
df53cd3b | 2515 | struct o2hb_callback_func *f; |
a7f6a5fb MF |
2516 | struct o2hb_callback *hbcall; |
2517 | int ret; | |
2518 | ||
2519 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2520 | BUG_ON(!list_empty(&hc->hc_item)); | |
2521 | ||
2522 | hbcall = hbcall_from_type(hc->hc_type); | |
2523 | if (IS_ERR(hbcall)) { | |
2524 | ret = PTR_ERR(hbcall); | |
2525 | goto out; | |
2526 | } | |
2527 | ||
14829422 | 2528 | if (region_uuid) { |
58a3158a SM |
2529 | ret = o2hb_region_inc_user(region_uuid); |
2530 | if (ret) { | |
2531 | mlog_errno(ret); | |
14829422 | 2532 | goto out; |
58a3158a | 2533 | } |
14829422 JB |
2534 | } |
2535 | ||
a7f6a5fb MF |
2536 | down_write(&o2hb_callback_sem); |
2537 | ||
df53cd3b DF |
2538 | list_for_each_entry(f, &hbcall->list, hc_item) { |
2539 | if (hc->hc_priority < f->hc_priority) { | |
2540 | list_add_tail(&hc->hc_item, &f->hc_item); | |
a7f6a5fb MF |
2541 | break; |
2542 | } | |
2543 | } | |
2544 | if (list_empty(&hc->hc_item)) | |
2545 | list_add_tail(&hc->hc_item, &hbcall->list); | |
2546 | ||
2547 | up_write(&o2hb_callback_sem); | |
2548 | ret = 0; | |
2549 | out: | |
58a3158a | 2550 | mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2551 | ret, __builtin_return_address(0), hc); |
2552 | return ret; | |
2553 | } | |
2554 | EXPORT_SYMBOL_GPL(o2hb_register_callback); | |
2555 | ||
14829422 JB |
2556 | void o2hb_unregister_callback(const char *region_uuid, |
2557 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
2558 | { |
2559 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2560 | ||
58a3158a | 2561 | mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2562 | __builtin_return_address(0), hc); |
2563 | ||
14829422 | 2564 | /* XXX Can this happen _with_ a region reference? */ |
a7f6a5fb | 2565 | if (list_empty(&hc->hc_item)) |
c24f72cc | 2566 | return; |
a7f6a5fb | 2567 | |
14829422 | 2568 | if (region_uuid) |
58a3158a | 2569 | o2hb_region_dec_user(region_uuid); |
14829422 | 2570 | |
a7f6a5fb MF |
2571 | down_write(&o2hb_callback_sem); |
2572 | ||
2573 | list_del_init(&hc->hc_item); | |
2574 | ||
2575 | up_write(&o2hb_callback_sem); | |
a7f6a5fb MF |
2576 | } |
2577 | EXPORT_SYMBOL_GPL(o2hb_unregister_callback); | |
2578 | ||
2579 | int o2hb_check_node_heartbeating(u8 node_num) | |
2580 | { | |
2581 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2582 | ||
2583 | o2hb_fill_node_map(testing_map, sizeof(testing_map)); | |
2584 | if (!test_bit(node_num, testing_map)) { | |
2585 | mlog(ML_HEARTBEAT, | |
2586 | "node (%u) does not have heartbeating enabled.\n", | |
2587 | node_num); | |
2588 | return 0; | |
2589 | } | |
2590 | ||
2591 | return 1; | |
2592 | } | |
2593 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating); | |
2594 | ||
70e82a12 JQ |
2595 | int o2hb_check_node_heartbeating_no_sem(u8 node_num) |
2596 | { | |
2597 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
70e82a12 | 2598 | |
4d548f61 | 2599 | spin_lock(&o2hb_live_lock); |
70e82a12 | 2600 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); |
4d548f61 | 2601 | spin_unlock(&o2hb_live_lock); |
70e82a12 JQ |
2602 | if (!test_bit(node_num, testing_map)) { |
2603 | mlog(ML_HEARTBEAT, | |
2604 | "node (%u) does not have heartbeating enabled.\n", | |
2605 | node_num); | |
2606 | return 0; | |
2607 | } | |
2608 | ||
2609 | return 1; | |
2610 | } | |
2611 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_no_sem); | |
2612 | ||
a7f6a5fb MF |
2613 | int o2hb_check_node_heartbeating_from_callback(u8 node_num) |
2614 | { | |
2615 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2616 | ||
2617 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); | |
2618 | if (!test_bit(node_num, testing_map)) { | |
2619 | mlog(ML_HEARTBEAT, | |
2620 | "node (%u) does not have heartbeating enabled.\n", | |
2621 | node_num); | |
2622 | return 0; | |
2623 | } | |
2624 | ||
2625 | return 1; | |
2626 | } | |
2627 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); | |
2628 | ||
2629 | /* Makes sure our local node is configured with a node number, and is | |
2630 | * heartbeating. */ | |
2631 | int o2hb_check_local_node_heartbeating(void) | |
2632 | { | |
2633 | u8 node_num; | |
2634 | ||
2635 | /* if this node was set then we have networking */ | |
2636 | node_num = o2nm_this_node(); | |
2637 | if (node_num == O2NM_MAX_NODES) { | |
2638 | mlog(ML_HEARTBEAT, "this node has not been configured.\n"); | |
2639 | return 0; | |
2640 | } | |
2641 | ||
2642 | return o2hb_check_node_heartbeating(node_num); | |
2643 | } | |
2644 | EXPORT_SYMBOL_GPL(o2hb_check_local_node_heartbeating); | |
2645 | ||
2646 | /* | |
2647 | * this is just a hack until we get the plumbing which flips file systems | |
2648 | * read only and drops the hb ref instead of killing the node dead. | |
2649 | */ | |
2650 | void o2hb_stop_all_regions(void) | |
2651 | { | |
2652 | struct o2hb_region *reg; | |
2653 | ||
2654 | mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); | |
2655 | ||
2656 | spin_lock(&o2hb_live_lock); | |
2657 | ||
2658 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) | |
2659 | reg->hr_unclean_stop = 1; | |
2660 | ||
2661 | spin_unlock(&o2hb_live_lock); | |
2662 | } | |
2663 | EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); | |
b3c85c4c SM |
2664 | |
2665 | int o2hb_get_all_regions(char *region_uuids, u8 max_regions) | |
2666 | { | |
2667 | struct o2hb_region *reg; | |
2668 | int numregs = 0; | |
2669 | char *p; | |
2670 | ||
2671 | spin_lock(&o2hb_live_lock); | |
2672 | ||
2673 | p = region_uuids; | |
2674 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { | |
4a184b4f X |
2675 | if (reg->hr_item_dropped) |
2676 | continue; | |
2677 | ||
b3c85c4c SM |
2678 | mlog(0, "Region: %s\n", config_item_name(®->hr_item)); |
2679 | if (numregs < max_regions) { | |
2680 | memcpy(p, config_item_name(®->hr_item), | |
2681 | O2HB_MAX_REGION_NAME_LEN); | |
2682 | p += O2HB_MAX_REGION_NAME_LEN; | |
2683 | } | |
2684 | numregs++; | |
2685 | } | |
2686 | ||
2687 | spin_unlock(&o2hb_live_lock); | |
2688 | ||
2689 | return numregs; | |
2690 | } | |
2691 | EXPORT_SYMBOL_GPL(o2hb_get_all_regions); | |
2692 | ||
2693 | int o2hb_global_heartbeat_active(void) | |
2694 | { | |
4d94aa1b | 2695 | return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL); |
b3c85c4c SM |
2696 | } |
2697 | EXPORT_SYMBOL(o2hb_global_heartbeat_active); |