Commit | Line | Data |
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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
fa60ce2c | 2 | /* |
a7f6a5fb | 3 | * Copyright (C) 2004, 2005 Oracle. All rights reserved. |
a7f6a5fb MF |
4 | */ |
5 | ||
6 | #include <linux/kernel.h> | |
7 | #include <linux/sched.h> | |
8 | #include <linux/jiffies.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/fs.h> | |
11 | #include <linux/bio.h> | |
12 | #include <linux/blkdev.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/file.h> | |
15 | #include <linux/kthread.h> | |
16 | #include <linux/configfs.h> | |
17 | #include <linux/random.h> | |
18 | #include <linux/crc32.h> | |
19 | #include <linux/time.h> | |
87d3d3f3 | 20 | #include <linux/debugfs.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
a8f70de3 | 22 | #include <linux/bitmap.h> |
40476b82 | 23 | #include <linux/ktime.h> |
a7f6a5fb MF |
24 | #include "heartbeat.h" |
25 | #include "tcp.h" | |
26 | #include "nodemanager.h" | |
27 | #include "quorum.h" | |
28 | ||
29 | #include "masklog.h" | |
30 | ||
31 | ||
32 | /* | |
33 | * The first heartbeat pass had one global thread that would serialize all hb | |
34 | * callback calls. This global serializing sem should only be removed once | |
35 | * we've made sure that all callees can deal with being called concurrently | |
36 | * from multiple hb region threads. | |
37 | */ | |
38 | static DECLARE_RWSEM(o2hb_callback_sem); | |
39 | ||
40 | /* | |
41 | * multiple hb threads are watching multiple regions. A node is live | |
42 | * whenever any of the threads sees activity from the node in its region. | |
43 | */ | |
34af946a | 44 | static DEFINE_SPINLOCK(o2hb_live_lock); |
a7f6a5fb MF |
45 | static struct list_head o2hb_live_slots[O2NM_MAX_NODES]; |
46 | static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
47 | static LIST_HEAD(o2hb_node_events); | |
48 | static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue); | |
49 | ||
536f0741 SM |
50 | /* |
51 | * In global heartbeat, we maintain a series of region bitmaps. | |
52 | * - o2hb_region_bitmap allows us to limit the region number to max region. | |
e7d656ba | 53 | * - o2hb_live_region_bitmap tracks live regions (seen steady iterations). |
43182d2a SM |
54 | * - o2hb_quorum_region_bitmap tracks live regions that have seen all nodes |
55 | * heartbeat on it. | |
b1c5ebfb | 56 | * - o2hb_failed_region_bitmap tracks the regions that have seen io timeouts. |
536f0741 SM |
57 | */ |
58 | static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; | |
e7d656ba | 59 | static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
43182d2a | 60 | static unsigned long o2hb_quorum_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
b1c5ebfb | 61 | static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
536f0741 | 62 | |
8ca8b0bb | 63 | #define O2HB_DB_TYPE_LIVENODES 0 |
a6de0136 SM |
64 | #define O2HB_DB_TYPE_LIVEREGIONS 1 |
65 | #define O2HB_DB_TYPE_QUORUMREGIONS 2 | |
66 | #define O2HB_DB_TYPE_FAILEDREGIONS 3 | |
1f285305 SM |
67 | #define O2HB_DB_TYPE_REGION_LIVENODES 4 |
68 | #define O2HB_DB_TYPE_REGION_NUMBER 5 | |
43695d09 | 69 | #define O2HB_DB_TYPE_REGION_ELAPSED_TIME 6 |
cb0586bd | 70 | #define O2HB_DB_TYPE_REGION_PINNED 7 |
8ca8b0bb SM |
71 | struct o2hb_debug_buf { |
72 | int db_type; | |
73 | int db_size; | |
74 | int db_len; | |
75 | void *db_data; | |
76 | }; | |
77 | ||
78 | static struct o2hb_debug_buf *o2hb_db_livenodes; | |
a6de0136 SM |
79 | static struct o2hb_debug_buf *o2hb_db_liveregions; |
80 | static struct o2hb_debug_buf *o2hb_db_quorumregions; | |
81 | static struct o2hb_debug_buf *o2hb_db_failedregions; | |
8ca8b0bb | 82 | |
87d3d3f3 SM |
83 | #define O2HB_DEBUG_DIR "o2hb" |
84 | #define O2HB_DEBUG_LIVENODES "livenodes" | |
a6de0136 SM |
85 | #define O2HB_DEBUG_LIVEREGIONS "live_regions" |
86 | #define O2HB_DEBUG_QUORUMREGIONS "quorum_regions" | |
87 | #define O2HB_DEBUG_FAILEDREGIONS "failed_regions" | |
1f285305 | 88 | #define O2HB_DEBUG_REGION_NUMBER "num" |
43695d09 | 89 | #define O2HB_DEBUG_REGION_ELAPSED_TIME "elapsed_time_in_ms" |
cb0586bd | 90 | #define O2HB_DEBUG_REGION_PINNED "pinned" |
8ca8b0bb | 91 | |
87d3d3f3 | 92 | static struct dentry *o2hb_debug_dir; |
87d3d3f3 | 93 | |
a7f6a5fb MF |
94 | static LIST_HEAD(o2hb_all_regions); |
95 | ||
96 | static struct o2hb_callback { | |
97 | struct list_head list; | |
98 | } o2hb_callbacks[O2HB_NUM_CB]; | |
99 | ||
100 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type); | |
101 | ||
54b5187b SM |
102 | enum o2hb_heartbeat_modes { |
103 | O2HB_HEARTBEAT_LOCAL = 0, | |
104 | O2HB_HEARTBEAT_GLOBAL, | |
105 | O2HB_HEARTBEAT_NUM_MODES, | |
106 | }; | |
107 | ||
480bd564 CIK |
108 | static const char *o2hb_heartbeat_mode_desc[O2HB_HEARTBEAT_NUM_MODES] = { |
109 | "local", /* O2HB_HEARTBEAT_LOCAL */ | |
110 | "global", /* O2HB_HEARTBEAT_GLOBAL */ | |
54b5187b SM |
111 | }; |
112 | ||
a7f6a5fb | 113 | unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD; |
480bd564 | 114 | static unsigned int o2hb_heartbeat_mode = O2HB_HEARTBEAT_LOCAL; |
a7f6a5fb | 115 | |
58a3158a SM |
116 | /* |
117 | * o2hb_dependent_users tracks the number of registered callbacks that depend | |
118 | * on heartbeat. o2net and o2dlm are two entities that register this callback. | |
119 | * However only o2dlm depends on the heartbeat. It does not want the heartbeat | |
120 | * to stop while a dlm domain is still active. | |
121 | */ | |
480bd564 | 122 | static unsigned int o2hb_dependent_users; |
58a3158a SM |
123 | |
124 | /* | |
125 | * In global heartbeat mode, all regions are pinned if there are one or more | |
126 | * dependent users and the quorum region count is <= O2HB_PIN_CUT_OFF. All | |
127 | * regions are unpinned if the region count exceeds the cut off or the number | |
128 | * of dependent users falls to zero. | |
129 | */ | |
130 | #define O2HB_PIN_CUT_OFF 3 | |
131 | ||
132 | /* | |
133 | * In local heartbeat mode, we assume the dlm domain name to be the same as | |
134 | * region uuid. This is true for domains created for the file system but not | |
135 | * necessarily true for userdlm domains. This is a known limitation. | |
136 | * | |
137 | * In global heartbeat mode, we pin/unpin all o2hb regions. This solution | |
138 | * works for both file system and userdlm domains. | |
139 | */ | |
140 | static int o2hb_region_pin(const char *region_uuid); | |
141 | static void o2hb_region_unpin(const char *region_uuid); | |
142 | ||
2bd63216 | 143 | /* Only sets a new threshold if there are no active regions. |
a7f6a5fb MF |
144 | * |
145 | * No locking or otherwise interesting code is required for reading | |
146 | * o2hb_dead_threshold as it can't change once regions are active and | |
147 | * it's not interesting to anyone until then anyway. */ | |
148 | static void o2hb_dead_threshold_set(unsigned int threshold) | |
149 | { | |
150 | if (threshold > O2HB_MIN_DEAD_THRESHOLD) { | |
151 | spin_lock(&o2hb_live_lock); | |
152 | if (list_empty(&o2hb_all_regions)) | |
153 | o2hb_dead_threshold = threshold; | |
154 | spin_unlock(&o2hb_live_lock); | |
155 | } | |
156 | } | |
157 | ||
70f651ed | 158 | static int o2hb_global_heartbeat_mode_set(unsigned int hb_mode) |
54b5187b SM |
159 | { |
160 | int ret = -1; | |
161 | ||
162 | if (hb_mode < O2HB_HEARTBEAT_NUM_MODES) { | |
163 | spin_lock(&o2hb_live_lock); | |
164 | if (list_empty(&o2hb_all_regions)) { | |
165 | o2hb_heartbeat_mode = hb_mode; | |
166 | ret = 0; | |
167 | } | |
168 | spin_unlock(&o2hb_live_lock); | |
169 | } | |
170 | ||
171 | return ret; | |
172 | } | |
173 | ||
a7f6a5fb MF |
174 | struct o2hb_node_event { |
175 | struct list_head hn_item; | |
176 | enum o2hb_callback_type hn_event_type; | |
177 | struct o2nm_node *hn_node; | |
178 | int hn_node_num; | |
179 | }; | |
180 | ||
181 | struct o2hb_disk_slot { | |
182 | struct o2hb_disk_heartbeat_block *ds_raw_block; | |
183 | u8 ds_node_num; | |
184 | u64 ds_last_time; | |
185 | u64 ds_last_generation; | |
186 | u16 ds_equal_samples; | |
187 | u16 ds_changed_samples; | |
188 | struct list_head ds_live_item; | |
189 | }; | |
190 | ||
191 | /* each thread owns a region.. when we're asked to tear down the region | |
192 | * we ask the thread to stop, who cleans up the region */ | |
193 | struct o2hb_region { | |
194 | struct config_item hr_item; | |
195 | ||
196 | struct list_head hr_all_item; | |
58a3158a | 197 | unsigned hr_unclean_stop:1, |
d2eece37 | 198 | hr_aborted_start:1, |
58a3158a | 199 | hr_item_pinned:1, |
0986fe9b JQ |
200 | hr_item_dropped:1, |
201 | hr_node_deleted:1; | |
a7f6a5fb MF |
202 | |
203 | /* protected by the hr_callback_sem */ | |
204 | struct task_struct *hr_task; | |
205 | ||
206 | unsigned int hr_blocks; | |
207 | unsigned long long hr_start_block; | |
208 | ||
209 | unsigned int hr_block_bits; | |
210 | unsigned int hr_block_bytes; | |
211 | ||
212 | unsigned int hr_slots_per_page; | |
213 | unsigned int hr_num_pages; | |
214 | ||
215 | struct page **hr_slot_data; | |
216 | struct block_device *hr_bdev; | |
217 | struct o2hb_disk_slot *hr_slots; | |
218 | ||
823a637a SM |
219 | /* live node map of this region */ |
220 | unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
536f0741 | 221 | unsigned int hr_region_num; |
823a637a | 222 | |
1f285305 | 223 | struct dentry *hr_debug_dir; |
1f285305 SM |
224 | struct o2hb_debug_buf *hr_db_livenodes; |
225 | struct o2hb_debug_buf *hr_db_regnum; | |
43695d09 | 226 | struct o2hb_debug_buf *hr_db_elapsed_time; |
cb0586bd | 227 | struct o2hb_debug_buf *hr_db_pinned; |
1f285305 | 228 | |
a7f6a5fb MF |
229 | /* let the person setting up hb wait for it to return until it |
230 | * has reached a 'steady' state. This will be fixed when we have | |
231 | * a more complete api that doesn't lead to this sort of fragility. */ | |
232 | atomic_t hr_steady_iterations; | |
233 | ||
d2eece37 SM |
234 | /* terminate o2hb thread if it does not reach steady state |
235 | * (hr_steady_iterations == 0) within hr_unsteady_iterations */ | |
236 | atomic_t hr_unsteady_iterations; | |
237 | ||
a7f6a5fb MF |
238 | char hr_dev_name[BDEVNAME_SIZE]; |
239 | ||
240 | unsigned int hr_timeout_ms; | |
241 | ||
242 | /* randomized as the region goes up and down so that a node | |
243 | * recognizes a node going up and down in one iteration */ | |
244 | u64 hr_generation; | |
245 | ||
c4028958 | 246 | struct delayed_work hr_write_timeout_work; |
a7f6a5fb MF |
247 | unsigned long hr_last_timeout_start; |
248 | ||
e0cbb798 JB |
249 | /* negotiate timer, used to negotiate extending hb timeout. */ |
250 | struct delayed_work hr_nego_timeout_work; | |
251 | unsigned long hr_nego_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
252 | ||
a7f6a5fb MF |
253 | /* Used during o2hb_check_slot to hold a copy of the block |
254 | * being checked because we temporarily have to zero out the | |
255 | * crc field. */ | |
256 | struct o2hb_disk_heartbeat_block *hr_tmp_block; | |
34069b88 JB |
257 | |
258 | /* Message key for negotiate timeout message. */ | |
259 | unsigned int hr_key; | |
260 | struct list_head hr_handler_list; | |
88dbe98d JB |
261 | |
262 | /* last hb status, 0 for success, other value for error. */ | |
263 | int hr_last_hb_status; | |
a7f6a5fb MF |
264 | }; |
265 | ||
266 | struct o2hb_bio_wait_ctxt { | |
267 | atomic_t wc_num_reqs; | |
268 | struct completion wc_io_complete; | |
a9e2ae39 | 269 | int wc_error; |
a7f6a5fb MF |
270 | }; |
271 | ||
1bd12902 JB |
272 | #define O2HB_NEGO_TIMEOUT_MS (O2HB_MAX_WRITE_TIMEOUT_MS/2) |
273 | ||
34069b88 JB |
274 | enum { |
275 | O2HB_NEGO_TIMEOUT_MSG = 1, | |
e76f8237 | 276 | O2HB_NEGO_APPROVE_MSG = 2, |
34069b88 JB |
277 | }; |
278 | ||
279 | struct o2hb_nego_msg { | |
280 | u8 node_num; | |
281 | }; | |
282 | ||
c4028958 | 283 | static void o2hb_write_timeout(struct work_struct *work) |
a7f6a5fb | 284 | { |
b1c5ebfb | 285 | int failed, quorum; |
c4028958 DH |
286 | struct o2hb_region *reg = |
287 | container_of(work, struct o2hb_region, | |
288 | hr_write_timeout_work.work); | |
a7f6a5fb MF |
289 | |
290 | mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u " | |
291 | "milliseconds\n", reg->hr_dev_name, | |
2bd63216 | 292 | jiffies_to_msecs(jiffies - reg->hr_last_timeout_start)); |
b1c5ebfb SM |
293 | |
294 | if (o2hb_global_heartbeat_active()) { | |
4d548f61 | 295 | spin_lock(&o2hb_live_lock); |
b1c5ebfb SM |
296 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) |
297 | set_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
a8f70de3 | 298 | failed = bitmap_weight(o2hb_failed_region_bitmap, |
b1c5ebfb | 299 | O2NM_MAX_REGIONS); |
a8f70de3 | 300 | quorum = bitmap_weight(o2hb_quorum_region_bitmap, |
b1c5ebfb | 301 | O2NM_MAX_REGIONS); |
4d548f61 | 302 | spin_unlock(&o2hb_live_lock); |
b1c5ebfb SM |
303 | |
304 | mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n", | |
305 | quorum, failed); | |
306 | ||
307 | /* | |
308 | * Fence if the number of failed regions >= half the number | |
309 | * of quorum regions | |
310 | */ | |
311 | if ((failed << 1) < quorum) | |
312 | return; | |
313 | } | |
314 | ||
a7f6a5fb MF |
315 | o2quo_disk_timeout(); |
316 | } | |
317 | ||
e0cbb798 | 318 | static void o2hb_arm_timeout(struct o2hb_region *reg) |
a7f6a5fb | 319 | { |
d2eece37 SM |
320 | /* Arm writeout only after thread reaches steady state */ |
321 | if (atomic_read(®->hr_steady_iterations) != 0) | |
322 | return; | |
323 | ||
b31d308d TM |
324 | mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n", |
325 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
a7f6a5fb | 326 | |
b1c5ebfb SM |
327 | if (o2hb_global_heartbeat_active()) { |
328 | spin_lock(&o2hb_live_lock); | |
329 | clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
330 | spin_unlock(&o2hb_live_lock); | |
331 | } | |
a7f6a5fb | 332 | cancel_delayed_work(®->hr_write_timeout_work); |
a7f6a5fb MF |
333 | schedule_delayed_work(®->hr_write_timeout_work, |
334 | msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS)); | |
e0cbb798 JB |
335 | |
336 | cancel_delayed_work(®->hr_nego_timeout_work); | |
337 | /* negotiate timeout must be less than write timeout. */ | |
338 | schedule_delayed_work(®->hr_nego_timeout_work, | |
1bd12902 | 339 | msecs_to_jiffies(O2HB_NEGO_TIMEOUT_MS)); |
e0cbb798 | 340 | memset(reg->hr_nego_node_bitmap, 0, sizeof(reg->hr_nego_node_bitmap)); |
a7f6a5fb MF |
341 | } |
342 | ||
e0cbb798 | 343 | static void o2hb_disarm_timeout(struct o2hb_region *reg) |
a7f6a5fb | 344 | { |
9b00a818 | 345 | cancel_delayed_work_sync(®->hr_write_timeout_work); |
e0cbb798 JB |
346 | cancel_delayed_work_sync(®->hr_nego_timeout_work); |
347 | } | |
348 | ||
34069b88 JB |
349 | static int o2hb_send_nego_msg(int key, int type, u8 target) |
350 | { | |
351 | struct o2hb_nego_msg msg; | |
352 | int status, ret; | |
353 | ||
354 | msg.node_num = o2nm_this_node(); | |
355 | again: | |
356 | ret = o2net_send_message(type, key, &msg, sizeof(msg), | |
357 | target, &status); | |
358 | ||
359 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
360 | msleep(100); | |
361 | goto again; | |
362 | } | |
363 | ||
364 | return ret; | |
365 | } | |
366 | ||
e0cbb798 JB |
367 | static void o2hb_nego_timeout(struct work_struct *work) |
368 | { | |
369 | unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1bd12902 | 370 | int master_node, i, ret; |
e0cbb798 JB |
371 | struct o2hb_region *reg; |
372 | ||
373 | reg = container_of(work, struct o2hb_region, hr_nego_timeout_work.work); | |
88dbe98d JB |
374 | /* don't negotiate timeout if last hb failed since it is very |
375 | * possible io failed. Should let write timeout fence self. | |
376 | */ | |
377 | if (reg->hr_last_hb_status) | |
378 | return; | |
379 | ||
e0cbb798 JB |
380 | o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap)); |
381 | /* lowest node as master node to make negotiate decision. */ | |
382 | master_node = find_next_bit(live_node_bitmap, O2NM_MAX_NODES, 0); | |
383 | ||
384 | if (master_node == o2nm_this_node()) { | |
1bd12902 JB |
385 | if (!test_bit(master_node, reg->hr_nego_node_bitmap)) { |
386 | printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%s).\n", | |
387 | o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000, | |
388 | config_item_name(®->hr_item), reg->hr_dev_name); | |
389 | set_bit(master_node, reg->hr_nego_node_bitmap); | |
390 | } | |
e0cbb798 JB |
391 | if (memcmp(reg->hr_nego_node_bitmap, live_node_bitmap, |
392 | sizeof(reg->hr_nego_node_bitmap))) { | |
393 | /* check negotiate bitmap every second to do timeout | |
394 | * approve decision. | |
395 | */ | |
396 | schedule_delayed_work(®->hr_nego_timeout_work, | |
397 | msecs_to_jiffies(1000)); | |
398 | ||
399 | return; | |
400 | } | |
401 | ||
1bd12902 JB |
402 | printk(KERN_NOTICE "o2hb: all nodes hb write hung, maybe region %s (%s) is down.\n", |
403 | config_item_name(®->hr_item), reg->hr_dev_name); | |
e0cbb798 | 404 | /* approve negotiate timeout request. */ |
e76f8237 JB |
405 | o2hb_arm_timeout(reg); |
406 | ||
407 | i = -1; | |
408 | while ((i = find_next_bit(live_node_bitmap, | |
409 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
410 | if (i == master_node) | |
411 | continue; | |
412 | ||
1bd12902 JB |
413 | mlog(ML_HEARTBEAT, "send NEGO_APPROVE msg to node %d\n", i); |
414 | ret = o2hb_send_nego_msg(reg->hr_key, | |
e76f8237 | 415 | O2HB_NEGO_APPROVE_MSG, i); |
1bd12902 JB |
416 | if (ret) |
417 | mlog(ML_ERROR, "send NEGO_APPROVE msg to node %d fail %d\n", | |
418 | i, ret); | |
e76f8237 | 419 | } |
e0cbb798 JB |
420 | } else { |
421 | /* negotiate timeout with master node. */ | |
1bd12902 JB |
422 | printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%s), negotiate timeout with node %d.\n", |
423 | o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000, config_item_name(®->hr_item), | |
424 | reg->hr_dev_name, master_node); | |
425 | ret = o2hb_send_nego_msg(reg->hr_key, O2HB_NEGO_TIMEOUT_MSG, | |
426 | master_node); | |
427 | if (ret) | |
428 | mlog(ML_ERROR, "send NEGO_TIMEOUT msg to node %d fail %d\n", | |
429 | master_node, ret); | |
e0cbb798 | 430 | } |
34069b88 JB |
431 | } |
432 | ||
433 | static int o2hb_nego_timeout_handler(struct o2net_msg *msg, u32 len, void *data, | |
434 | void **ret_data) | |
435 | { | |
436 | struct o2hb_region *reg = data; | |
437 | struct o2hb_nego_msg *nego_msg; | |
e0cbb798 | 438 | |
34069b88 | 439 | nego_msg = (struct o2hb_nego_msg *)msg->buf; |
1bd12902 JB |
440 | printk(KERN_NOTICE "o2hb: receive negotiate timeout message from node %d on region %s (%s).\n", |
441 | nego_msg->node_num, config_item_name(®->hr_item), reg->hr_dev_name); | |
34069b88 JB |
442 | if (nego_msg->node_num < O2NM_MAX_NODES) |
443 | set_bit(nego_msg->node_num, reg->hr_nego_node_bitmap); | |
444 | else | |
445 | mlog(ML_ERROR, "got nego timeout message from bad node.\n"); | |
446 | ||
447 | return 0; | |
a7f6a5fb MF |
448 | } |
449 | ||
e76f8237 JB |
450 | static int o2hb_nego_approve_handler(struct o2net_msg *msg, u32 len, void *data, |
451 | void **ret_data) | |
452 | { | |
1bd12902 JB |
453 | struct o2hb_region *reg = data; |
454 | ||
455 | printk(KERN_NOTICE "o2hb: negotiate timeout approved by master node on region %s (%s).\n", | |
456 | config_item_name(®->hr_item), reg->hr_dev_name); | |
457 | o2hb_arm_timeout(reg); | |
e76f8237 JB |
458 | return 0; |
459 | } | |
460 | ||
b559292e | 461 | static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc) |
a7f6a5fb | 462 | { |
b559292e | 463 | atomic_set(&wc->wc_num_reqs, 1); |
a7f6a5fb | 464 | init_completion(&wc->wc_io_complete); |
a9e2ae39 | 465 | wc->wc_error = 0; |
a7f6a5fb MF |
466 | } |
467 | ||
468 | /* Used in error paths too */ | |
469 | static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc, | |
470 | unsigned int num) | |
471 | { | |
472 | /* sadly atomic_sub_and_test() isn't available on all platforms. The | |
473 | * good news is that the fast path only completes one at a time */ | |
474 | while(num--) { | |
475 | if (atomic_dec_and_test(&wc->wc_num_reqs)) { | |
476 | BUG_ON(num > 0); | |
477 | complete(&wc->wc_io_complete); | |
478 | } | |
479 | } | |
480 | } | |
481 | ||
964f14a0 | 482 | static void o2hb_wait_on_io(struct o2hb_bio_wait_ctxt *wc) |
a7f6a5fb | 483 | { |
b559292e | 484 | o2hb_bio_wait_dec(wc, 1); |
a7f6a5fb MF |
485 | wait_for_completion(&wc->wc_io_complete); |
486 | } | |
487 | ||
4246a0b6 | 488 | static void o2hb_bio_end_io(struct bio *bio) |
a7f6a5fb MF |
489 | { |
490 | struct o2hb_bio_wait_ctxt *wc = bio->bi_private; | |
491 | ||
4e4cbee9 CH |
492 | if (bio->bi_status) { |
493 | mlog(ML_ERROR, "IO Error %d\n", bio->bi_status); | |
494 | wc->wc_error = blk_status_to_errno(bio->bi_status); | |
a9e2ae39 | 495 | } |
a7f6a5fb | 496 | |
a7f6a5fb | 497 | o2hb_bio_wait_dec(wc, 1); |
b559292e | 498 | bio_put(bio); |
a7f6a5fb MF |
499 | } |
500 | ||
501 | /* Setup a Bio to cover I/O against num_slots slots starting at | |
502 | * start_slot. */ | |
503 | static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, | |
504 | struct o2hb_bio_wait_ctxt *wc, | |
b559292e | 505 | unsigned int *current_slot, |
0d16dcfe MC |
506 | unsigned int max_slots, int op, |
507 | int op_flags) | |
a7f6a5fb | 508 | { |
b559292e | 509 | int len, current_page; |
a7f6a5fb MF |
510 | unsigned int vec_len, vec_start; |
511 | unsigned int bits = reg->hr_block_bits; | |
512 | unsigned int spp = reg->hr_slots_per_page; | |
b559292e | 513 | unsigned int cs = *current_slot; |
a7f6a5fb MF |
514 | struct bio *bio; |
515 | struct page *page; | |
516 | ||
a7f6a5fb MF |
517 | /* Testing has shown this allocation to take long enough under |
518 | * GFP_KERNEL that the local node can get fenced. It would be | |
519 | * nicest if we could pre-allocate these bios and avoid this | |
520 | * all together. */ | |
b559292e | 521 | bio = bio_alloc(GFP_ATOMIC, 16); |
a7f6a5fb MF |
522 | if (!bio) { |
523 | mlog(ML_ERROR, "Could not alloc slots BIO!\n"); | |
524 | bio = ERR_PTR(-ENOMEM); | |
525 | goto bail; | |
526 | } | |
527 | ||
528 | /* Must put everything in 512 byte sectors for the bio... */ | |
4f024f37 | 529 | bio->bi_iter.bi_sector = (reg->hr_start_block + cs) << (bits - 9); |
74d46992 | 530 | bio_set_dev(bio, reg->hr_bdev); |
a7f6a5fb MF |
531 | bio->bi_private = wc; |
532 | bio->bi_end_io = o2hb_bio_end_io; | |
0d16dcfe | 533 | bio_set_op_attrs(bio, op, op_flags); |
a7f6a5fb | 534 | |
09cbfeaf | 535 | vec_start = (cs << bits) % PAGE_SIZE; |
b559292e PR |
536 | while(cs < max_slots) { |
537 | current_page = cs / spp; | |
538 | page = reg->hr_slot_data[current_page]; | |
a7f6a5fb | 539 | |
09cbfeaf KS |
540 | vec_len = min(PAGE_SIZE - vec_start, |
541 | (max_slots-cs) * (PAGE_SIZE/spp) ); | |
a7f6a5fb MF |
542 | |
543 | mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", | |
b559292e | 544 | current_page, vec_len, vec_start); |
a7f6a5fb MF |
545 | |
546 | len = bio_add_page(bio, page, vec_len, vec_start); | |
3373de20 | 547 | if (len != vec_len) break; |
a7f6a5fb | 548 | |
09cbfeaf | 549 | cs += vec_len / (PAGE_SIZE/spp); |
a7f6a5fb MF |
550 | vec_start = 0; |
551 | } | |
552 | ||
553 | bail: | |
b559292e | 554 | *current_slot = cs; |
a7f6a5fb MF |
555 | return bio; |
556 | } | |
557 | ||
a7f6a5fb | 558 | static int o2hb_read_slots(struct o2hb_region *reg, |
874b1ef0 | 559 | unsigned int begin_slot, |
a7f6a5fb MF |
560 | unsigned int max_slots) |
561 | { | |
874b1ef0 | 562 | unsigned int current_slot = begin_slot; |
b559292e | 563 | int status; |
a7f6a5fb | 564 | struct o2hb_bio_wait_ctxt wc; |
a7f6a5fb MF |
565 | struct bio *bio; |
566 | ||
b559292e | 567 | o2hb_bio_wait_init(&wc); |
a7f6a5fb | 568 | |
b559292e | 569 | while(current_slot < max_slots) { |
4e49ea4a | 570 | bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots, |
0d16dcfe | 571 | REQ_OP_READ, 0); |
a7f6a5fb | 572 | if (IS_ERR(bio)) { |
a7f6a5fb MF |
573 | status = PTR_ERR(bio); |
574 | mlog_errno(status); | |
575 | goto bail_and_wait; | |
576 | } | |
a7f6a5fb | 577 | |
b559292e | 578 | atomic_inc(&wc.wc_num_reqs); |
4e49ea4a | 579 | submit_bio(bio); |
a7f6a5fb MF |
580 | } |
581 | ||
582 | status = 0; | |
583 | ||
584 | bail_and_wait: | |
964f14a0 | 585 | o2hb_wait_on_io(&wc); |
a9e2ae39 MF |
586 | if (wc.wc_error && !status) |
587 | status = wc.wc_error; | |
a7f6a5fb | 588 | |
a7f6a5fb MF |
589 | return status; |
590 | } | |
591 | ||
592 | static int o2hb_issue_node_write(struct o2hb_region *reg, | |
a7f6a5fb MF |
593 | struct o2hb_bio_wait_ctxt *write_wc) |
594 | { | |
595 | int status; | |
596 | unsigned int slot; | |
597 | struct bio *bio; | |
598 | ||
b559292e | 599 | o2hb_bio_wait_init(write_wc); |
a7f6a5fb MF |
600 | |
601 | slot = o2nm_this_node(); | |
602 | ||
0d16dcfe | 603 | bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1, REQ_OP_WRITE, |
70fd7614 | 604 | REQ_SYNC); |
a7f6a5fb MF |
605 | if (IS_ERR(bio)) { |
606 | status = PTR_ERR(bio); | |
607 | mlog_errno(status); | |
608 | goto bail; | |
609 | } | |
610 | ||
b559292e | 611 | atomic_inc(&write_wc->wc_num_reqs); |
4e49ea4a | 612 | submit_bio(bio); |
a7f6a5fb | 613 | |
a7f6a5fb MF |
614 | status = 0; |
615 | bail: | |
616 | return status; | |
617 | } | |
618 | ||
619 | static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, | |
620 | struct o2hb_disk_heartbeat_block *hb_block) | |
621 | { | |
622 | __le32 old_cksum; | |
623 | u32 ret; | |
624 | ||
625 | /* We want to compute the block crc with a 0 value in the | |
626 | * hb_cksum field. Save it off here and replace after the | |
627 | * crc. */ | |
628 | old_cksum = hb_block->hb_cksum; | |
629 | hb_block->hb_cksum = 0; | |
630 | ||
631 | ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); | |
632 | ||
633 | hb_block->hb_cksum = old_cksum; | |
634 | ||
635 | return ret; | |
636 | } | |
637 | ||
638 | static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) | |
639 | { | |
70bacbdb MF |
640 | mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, " |
641 | "cksum = 0x%x, generation 0x%llx\n", | |
642 | (long long)le64_to_cpu(hb_block->hb_seq), | |
643 | hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum), | |
644 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
645 | } |
646 | ||
647 | static int o2hb_verify_crc(struct o2hb_region *reg, | |
648 | struct o2hb_disk_heartbeat_block *hb_block) | |
649 | { | |
650 | u32 read, computed; | |
651 | ||
652 | read = le32_to_cpu(hb_block->hb_cksum); | |
653 | computed = o2hb_compute_block_crc_le(reg, hb_block); | |
654 | ||
655 | return read == computed; | |
656 | } | |
657 | ||
d2eece37 SM |
658 | /* |
659 | * Compare the slot data with what we wrote in the last iteration. | |
660 | * If the match fails, print an appropriate error message. This is to | |
661 | * detect errors like... another node hearting on the same slot, | |
662 | * flaky device that is losing writes, etc. | |
663 | * Returns 1 if check succeeds, 0 otherwise. | |
664 | */ | |
665 | static int o2hb_check_own_slot(struct o2hb_region *reg) | |
a7f6a5fb | 666 | { |
a7f6a5fb MF |
667 | struct o2hb_disk_slot *slot; |
668 | struct o2hb_disk_heartbeat_block *hb_block; | |
33c12a54 | 669 | char *errstr; |
a7f6a5fb | 670 | |
33c12a54 | 671 | slot = ®->hr_slots[o2nm_this_node()]; |
a7f6a5fb | 672 | /* Don't check on our 1st timestamp */ |
33c12a54 | 673 | if (!slot->ds_last_time) |
d2eece37 | 674 | return 0; |
a7f6a5fb | 675 | |
33c12a54 SM |
676 | hb_block = slot->ds_raw_block; |
677 | if (le64_to_cpu(hb_block->hb_seq) == slot->ds_last_time && | |
678 | le64_to_cpu(hb_block->hb_generation) == slot->ds_last_generation && | |
679 | hb_block->hb_node == slot->ds_node_num) | |
d2eece37 | 680 | return 1; |
a7f6a5fb | 681 | |
33c12a54 SM |
682 | #define ERRSTR1 "Another node is heartbeating on device" |
683 | #define ERRSTR2 "Heartbeat generation mismatch on device" | |
684 | #define ERRSTR3 "Heartbeat sequence mismatch on device" | |
685 | ||
686 | if (hb_block->hb_node != slot->ds_node_num) | |
687 | errstr = ERRSTR1; | |
688 | else if (le64_to_cpu(hb_block->hb_generation) != | |
689 | slot->ds_last_generation) | |
690 | errstr = ERRSTR2; | |
691 | else | |
692 | errstr = ERRSTR3; | |
693 | ||
694 | mlog(ML_ERROR, "%s (%s): expected(%u:0x%llx, 0x%llx), " | |
695 | "ondisk(%u:0x%llx, 0x%llx)\n", errstr, reg->hr_dev_name, | |
696 | slot->ds_node_num, (unsigned long long)slot->ds_last_generation, | |
697 | (unsigned long long)slot->ds_last_time, hb_block->hb_node, | |
698 | (unsigned long long)le64_to_cpu(hb_block->hb_generation), | |
699 | (unsigned long long)le64_to_cpu(hb_block->hb_seq)); | |
d2eece37 SM |
700 | |
701 | return 0; | |
a7f6a5fb MF |
702 | } |
703 | ||
704 | static inline void o2hb_prepare_block(struct o2hb_region *reg, | |
705 | u64 generation) | |
706 | { | |
707 | int node_num; | |
708 | u64 cputime; | |
709 | struct o2hb_disk_slot *slot; | |
710 | struct o2hb_disk_heartbeat_block *hb_block; | |
711 | ||
712 | node_num = o2nm_this_node(); | |
713 | slot = ®->hr_slots[node_num]; | |
714 | ||
715 | hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; | |
716 | memset(hb_block, 0, reg->hr_block_bytes); | |
717 | /* TODO: time stuff */ | |
c62c38f6 | 718 | cputime = ktime_get_real_seconds(); |
a7f6a5fb MF |
719 | if (!cputime) |
720 | cputime = 1; | |
721 | ||
722 | hb_block->hb_seq = cpu_to_le64(cputime); | |
723 | hb_block->hb_node = node_num; | |
724 | hb_block->hb_generation = cpu_to_le64(generation); | |
0db638f4 | 725 | hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS); |
a7f6a5fb MF |
726 | |
727 | /* This step must always happen last! */ | |
728 | hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, | |
729 | hb_block)); | |
730 | ||
70bacbdb | 731 | mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n", |
5fdf1e67 | 732 | (long long)generation, |
70bacbdb | 733 | le32_to_cpu(hb_block->hb_cksum)); |
a7f6a5fb MF |
734 | } |
735 | ||
736 | static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, | |
737 | struct o2nm_node *node, | |
738 | int idx) | |
739 | { | |
a7f6a5fb MF |
740 | struct o2hb_callback_func *f; |
741 | ||
df53cd3b | 742 | list_for_each_entry(f, &hbcall->list, hc_item) { |
a7f6a5fb MF |
743 | mlog(ML_HEARTBEAT, "calling funcs %p\n", f); |
744 | (f->hc_func)(node, idx, f->hc_data); | |
745 | } | |
746 | } | |
747 | ||
748 | /* Will run the list in order until we process the passed event */ | |
749 | static void o2hb_run_event_list(struct o2hb_node_event *queued_event) | |
750 | { | |
a7f6a5fb MF |
751 | struct o2hb_callback *hbcall; |
752 | struct o2hb_node_event *event; | |
753 | ||
a7f6a5fb MF |
754 | /* Holding callback sem assures we don't alter the callback |
755 | * lists when doing this, and serializes ourselves with other | |
756 | * processes wanting callbacks. */ | |
757 | down_write(&o2hb_callback_sem); | |
758 | ||
759 | spin_lock(&o2hb_live_lock); | |
760 | while (!list_empty(&o2hb_node_events) | |
761 | && !list_empty(&queued_event->hn_item)) { | |
762 | event = list_entry(o2hb_node_events.next, | |
763 | struct o2hb_node_event, | |
764 | hn_item); | |
765 | list_del_init(&event->hn_item); | |
766 | spin_unlock(&o2hb_live_lock); | |
767 | ||
768 | mlog(ML_HEARTBEAT, "Node %s event for %d\n", | |
769 | event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", | |
770 | event->hn_node_num); | |
771 | ||
772 | hbcall = hbcall_from_type(event->hn_event_type); | |
773 | ||
774 | /* We should *never* have gotten on to the list with a | |
775 | * bad type... This isn't something that we should try | |
776 | * to recover from. */ | |
777 | BUG_ON(IS_ERR(hbcall)); | |
778 | ||
779 | o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); | |
780 | ||
781 | spin_lock(&o2hb_live_lock); | |
782 | } | |
783 | spin_unlock(&o2hb_live_lock); | |
784 | ||
785 | up_write(&o2hb_callback_sem); | |
786 | } | |
787 | ||
788 | static void o2hb_queue_node_event(struct o2hb_node_event *event, | |
789 | enum o2hb_callback_type type, | |
790 | struct o2nm_node *node, | |
791 | int node_num) | |
792 | { | |
793 | assert_spin_locked(&o2hb_live_lock); | |
794 | ||
0e105d37 SM |
795 | BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB)); |
796 | ||
a7f6a5fb MF |
797 | event->hn_event_type = type; |
798 | event->hn_node = node; | |
799 | event->hn_node_num = node_num; | |
800 | ||
801 | mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", | |
802 | type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); | |
803 | ||
804 | list_add_tail(&event->hn_item, &o2hb_node_events); | |
805 | } | |
806 | ||
807 | static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) | |
808 | { | |
809 | struct o2hb_node_event event = | |
810 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
811 | struct o2nm_node *node; | |
6f8648e8 | 812 | int queued = 0; |
a7f6a5fb MF |
813 | |
814 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
815 | if (!node) | |
816 | return; | |
817 | ||
818 | spin_lock(&o2hb_live_lock); | |
819 | if (!list_empty(&slot->ds_live_item)) { | |
820 | mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", | |
821 | slot->ds_node_num); | |
822 | ||
823 | list_del_init(&slot->ds_live_item); | |
824 | ||
825 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
826 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
827 | ||
828 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
829 | slot->ds_node_num); | |
6f8648e8 | 830 | queued = 1; |
a7f6a5fb MF |
831 | } |
832 | } | |
833 | spin_unlock(&o2hb_live_lock); | |
834 | ||
6f8648e8 J |
835 | if (queued) |
836 | o2hb_run_event_list(&event); | |
a7f6a5fb MF |
837 | |
838 | o2nm_node_put(node); | |
839 | } | |
840 | ||
d2eece37 | 841 | static void o2hb_set_quorum_device(struct o2hb_region *reg) |
43182d2a | 842 | { |
43182d2a SM |
843 | if (!o2hb_global_heartbeat_active()) |
844 | return; | |
845 | ||
d2eece37 SM |
846 | /* Prevent race with o2hb_heartbeat_group_drop_item() */ |
847 | if (kthread_should_stop()) | |
43182d2a SM |
848 | return; |
849 | ||
d2eece37 SM |
850 | /* Tag region as quorum only after thread reaches steady state */ |
851 | if (atomic_read(®->hr_steady_iterations) != 0) | |
852 | return; | |
853 | ||
854 | spin_lock(&o2hb_live_lock); | |
855 | ||
856 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
857 | goto unlock; | |
858 | ||
43182d2a SM |
859 | /* |
860 | * A region can be added to the quorum only when it sees all | |
861 | * live nodes heartbeat on it. In other words, the region has been | |
862 | * added to all nodes. | |
863 | */ | |
864 | if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap, | |
865 | sizeof(o2hb_live_node_bitmap))) | |
d2eece37 | 866 | goto unlock; |
43182d2a | 867 | |
d2eece37 SM |
868 | printk(KERN_NOTICE "o2hb: Region %s (%s) is now a quorum device\n", |
869 | config_item_name(®->hr_item), reg->hr_dev_name); | |
43182d2a SM |
870 | |
871 | set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
58a3158a SM |
872 | |
873 | /* | |
874 | * If global heartbeat active, unpin all regions if the | |
875 | * region count > CUT_OFF | |
876 | */ | |
a8f70de3 | 877 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
878 | O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF) |
879 | o2hb_region_unpin(NULL); | |
d2eece37 SM |
880 | unlock: |
881 | spin_unlock(&o2hb_live_lock); | |
43182d2a SM |
882 | } |
883 | ||
a7f6a5fb MF |
884 | static int o2hb_check_slot(struct o2hb_region *reg, |
885 | struct o2hb_disk_slot *slot) | |
886 | { | |
887 | int changed = 0, gen_changed = 0; | |
888 | struct o2hb_node_event event = | |
889 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
890 | struct o2nm_node *node; | |
891 | struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; | |
892 | u64 cputime; | |
0db638f4 MF |
893 | unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS; |
894 | unsigned int slot_dead_ms; | |
0e105d37 | 895 | int tmp; |
6f8648e8 | 896 | int queued = 0; |
a7f6a5fb MF |
897 | |
898 | memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); | |
899 | ||
0e105d37 SM |
900 | /* |
901 | * If a node is no longer configured but is still in the livemap, we | |
902 | * may need to clear that bit from the livemap. | |
903 | */ | |
a7f6a5fb | 904 | node = o2nm_get_node_by_num(slot->ds_node_num); |
0e105d37 SM |
905 | if (!node) { |
906 | spin_lock(&o2hb_live_lock); | |
907 | tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
908 | spin_unlock(&o2hb_live_lock); | |
909 | if (!tmp) | |
910 | return 0; | |
911 | } | |
a7f6a5fb MF |
912 | |
913 | if (!o2hb_verify_crc(reg, hb_block)) { | |
914 | /* all paths from here will drop o2hb_live_lock for | |
915 | * us. */ | |
916 | spin_lock(&o2hb_live_lock); | |
917 | ||
918 | /* Don't print an error on the console in this case - | |
919 | * a freshly formatted heartbeat area will not have a | |
920 | * crc set on it. */ | |
921 | if (list_empty(&slot->ds_live_item)) | |
922 | goto out; | |
923 | ||
924 | /* The node is live but pushed out a bad crc. We | |
925 | * consider it a transient miss but don't populate any | |
926 | * other values as they may be junk. */ | |
927 | mlog(ML_ERROR, "Node %d has written a bad crc to %s\n", | |
928 | slot->ds_node_num, reg->hr_dev_name); | |
929 | o2hb_dump_slot(hb_block); | |
930 | ||
931 | slot->ds_equal_samples++; | |
932 | goto fire_callbacks; | |
933 | } | |
934 | ||
935 | /* we don't care if these wrap.. the state transitions below | |
936 | * clear at the right places */ | |
937 | cputime = le64_to_cpu(hb_block->hb_seq); | |
938 | if (slot->ds_last_time != cputime) | |
939 | slot->ds_changed_samples++; | |
940 | else | |
941 | slot->ds_equal_samples++; | |
942 | slot->ds_last_time = cputime; | |
943 | ||
944 | /* The node changed heartbeat generations. We assume this to | |
945 | * mean it dropped off but came back before we timed out. We | |
946 | * want to consider it down for the time being but don't want | |
947 | * to lose any changed_samples state we might build up to | |
948 | * considering it live again. */ | |
949 | if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { | |
950 | gen_changed = 1; | |
951 | slot->ds_equal_samples = 0; | |
70bacbdb MF |
952 | mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx " |
953 | "to 0x%llx)\n", slot->ds_node_num, | |
954 | (long long)slot->ds_last_generation, | |
955 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
956 | } |
957 | ||
958 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
959 | ||
70bacbdb MF |
960 | mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x " |
961 | "seq %llu last %llu changed %u equal %u\n", | |
962 | slot->ds_node_num, (long long)slot->ds_last_generation, | |
963 | le32_to_cpu(hb_block->hb_cksum), | |
2bd63216 | 964 | (unsigned long long)le64_to_cpu(hb_block->hb_seq), |
70bacbdb | 965 | (unsigned long long)slot->ds_last_time, slot->ds_changed_samples, |
a7f6a5fb MF |
966 | slot->ds_equal_samples); |
967 | ||
968 | spin_lock(&o2hb_live_lock); | |
969 | ||
970 | fire_callbacks: | |
971 | /* dead nodes only come to life after some number of | |
972 | * changes at any time during their dead time */ | |
973 | if (list_empty(&slot->ds_live_item) && | |
974 | slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { | |
70bacbdb MF |
975 | mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n", |
976 | slot->ds_node_num, (long long)slot->ds_last_generation); | |
a7f6a5fb | 977 | |
823a637a SM |
978 | set_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
979 | ||
a7f6a5fb MF |
980 | /* first on the list generates a callback */ |
981 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
982 | mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes " |
983 | "bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
984 | set_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
985 | ||
986 | o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, | |
987 | slot->ds_node_num); | |
988 | ||
989 | changed = 1; | |
6f8648e8 | 990 | queued = 1; |
a7f6a5fb MF |
991 | } |
992 | ||
993 | list_add_tail(&slot->ds_live_item, | |
994 | &o2hb_live_slots[slot->ds_node_num]); | |
995 | ||
996 | slot->ds_equal_samples = 0; | |
0db638f4 MF |
997 | |
998 | /* We want to be sure that all nodes agree on the | |
999 | * number of milliseconds before a node will be | |
1000 | * considered dead. The self-fencing timeout is | |
1001 | * computed from this value, and a discrepancy might | |
1002 | * result in heartbeat calling a node dead when it | |
1003 | * hasn't self-fenced yet. */ | |
1004 | slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms); | |
1005 | if (slot_dead_ms && slot_dead_ms != dead_ms) { | |
1006 | /* TODO: Perhaps we can fail the region here. */ | |
1007 | mlog(ML_ERROR, "Node %d on device %s has a dead count " | |
1008 | "of %u ms, but our count is %u ms.\n" | |
1009 | "Please double check your configuration values " | |
1010 | "for 'O2CB_HEARTBEAT_THRESHOLD'\n", | |
1011 | slot->ds_node_num, reg->hr_dev_name, slot_dead_ms, | |
1012 | dead_ms); | |
1013 | } | |
a7f6a5fb MF |
1014 | goto out; |
1015 | } | |
1016 | ||
1017 | /* if the list is dead, we're done.. */ | |
1018 | if (list_empty(&slot->ds_live_item)) | |
1019 | goto out; | |
1020 | ||
1021 | /* live nodes only go dead after enough consequtive missed | |
1022 | * samples.. reset the missed counter whenever we see | |
1023 | * activity */ | |
1024 | if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { | |
1025 | mlog(ML_HEARTBEAT, "Node %d left my region\n", | |
1026 | slot->ds_node_num); | |
1027 | ||
823a637a SM |
1028 | clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
1029 | ||
a7f6a5fb MF |
1030 | /* last off the live_slot generates a callback */ |
1031 | list_del_init(&slot->ds_live_item); | |
1032 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
1033 | mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live " |
1034 | "nodes bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
1035 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
1036 | ||
0e105d37 SM |
1037 | /* node can be null */ |
1038 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, | |
1039 | node, slot->ds_node_num); | |
a7f6a5fb MF |
1040 | |
1041 | changed = 1; | |
6f8648e8 | 1042 | queued = 1; |
a7f6a5fb MF |
1043 | } |
1044 | ||
1045 | /* We don't clear this because the node is still | |
1046 | * actually writing new blocks. */ | |
1047 | if (!gen_changed) | |
1048 | slot->ds_changed_samples = 0; | |
1049 | goto out; | |
1050 | } | |
1051 | if (slot->ds_changed_samples) { | |
1052 | slot->ds_changed_samples = 0; | |
1053 | slot->ds_equal_samples = 0; | |
1054 | } | |
1055 | out: | |
1056 | spin_unlock(&o2hb_live_lock); | |
1057 | ||
6f8648e8 J |
1058 | if (queued) |
1059 | o2hb_run_event_list(&event); | |
a7f6a5fb | 1060 | |
0e105d37 SM |
1061 | if (node) |
1062 | o2nm_node_put(node); | |
a7f6a5fb MF |
1063 | return changed; |
1064 | } | |
1065 | ||
518df6bd | 1066 | static int o2hb_highest_node(unsigned long *nodes, int numbits) |
a7f6a5fb | 1067 | { |
518df6bd | 1068 | return find_last_bit(nodes, numbits); |
a7f6a5fb MF |
1069 | } |
1070 | ||
874b1ef0 JG |
1071 | static int o2hb_lowest_node(unsigned long *nodes, int numbits) |
1072 | { | |
1073 | return find_first_bit(nodes, numbits); | |
1074 | } | |
1075 | ||
a9e2ae39 | 1076 | static int o2hb_do_disk_heartbeat(struct o2hb_region *reg) |
a7f6a5fb | 1077 | { |
874b1ef0 | 1078 | int i, ret, highest_node, lowest_node; |
d2eece37 | 1079 | int membership_change = 0, own_slot_ok = 0; |
a7f6a5fb | 1080 | unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
0e105d37 | 1081 | unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
a7f6a5fb MF |
1082 | struct o2hb_bio_wait_ctxt write_wc; |
1083 | ||
a9e2ae39 MF |
1084 | ret = o2nm_configured_node_map(configured_nodes, |
1085 | sizeof(configured_nodes)); | |
1086 | if (ret) { | |
1087 | mlog_errno(ret); | |
d2eece37 | 1088 | goto bail; |
a9e2ae39 | 1089 | } |
a7f6a5fb | 1090 | |
0e105d37 SM |
1091 | /* |
1092 | * If a node is not configured but is in the livemap, we still need | |
1093 | * to read the slot so as to be able to remove it from the livemap. | |
1094 | */ | |
1095 | o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap)); | |
1096 | i = -1; | |
1097 | while ((i = find_next_bit(live_node_bitmap, | |
1098 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
1099 | set_bit(i, configured_nodes); | |
1100 | } | |
1101 | ||
a7f6a5fb | 1102 | highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); |
874b1ef0 JG |
1103 | lowest_node = o2hb_lowest_node(configured_nodes, O2NM_MAX_NODES); |
1104 | if (highest_node >= O2NM_MAX_NODES || lowest_node >= O2NM_MAX_NODES) { | |
d2eece37 SM |
1105 | mlog(ML_NOTICE, "o2hb: No configured nodes found!\n"); |
1106 | ret = -EINVAL; | |
1107 | goto bail; | |
a7f6a5fb MF |
1108 | } |
1109 | ||
1110 | /* No sense in reading the slots of nodes that don't exist | |
1111 | * yet. Of course, if the node definitions have holes in them | |
1112 | * then we're reading an empty slot anyway... Consider this | |
1113 | * best-effort. */ | |
874b1ef0 | 1114 | ret = o2hb_read_slots(reg, lowest_node, highest_node + 1); |
a7f6a5fb MF |
1115 | if (ret < 0) { |
1116 | mlog_errno(ret); | |
d2eece37 | 1117 | goto bail; |
a7f6a5fb MF |
1118 | } |
1119 | ||
1120 | /* With an up to date view of the slots, we can check that no | |
1121 | * other node has been improperly configured to heartbeat in | |
1122 | * our slot. */ | |
d2eece37 | 1123 | own_slot_ok = o2hb_check_own_slot(reg); |
a7f6a5fb MF |
1124 | |
1125 | /* fill in the proper info for our next heartbeat */ | |
1126 | o2hb_prepare_block(reg, reg->hr_generation); | |
1127 | ||
b559292e | 1128 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
1129 | if (ret < 0) { |
1130 | mlog_errno(ret); | |
d2eece37 | 1131 | goto bail; |
a7f6a5fb MF |
1132 | } |
1133 | ||
1134 | i = -1; | |
33c12a54 SM |
1135 | while((i = find_next_bit(configured_nodes, |
1136 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
d2eece37 | 1137 | membership_change |= o2hb_check_slot(reg, ®->hr_slots[i]); |
a7f6a5fb MF |
1138 | } |
1139 | ||
1140 | /* | |
1141 | * We have to be sure we've advertised ourselves on disk | |
1142 | * before we can go to steady state. This ensures that | |
1143 | * people we find in our steady state have seen us. | |
1144 | */ | |
964f14a0 | 1145 | o2hb_wait_on_io(&write_wc); |
a9e2ae39 MF |
1146 | if (write_wc.wc_error) { |
1147 | /* Do not re-arm the write timeout on I/O error - we | |
1148 | * can't be sure that the new block ever made it to | |
1149 | * disk */ | |
1150 | mlog(ML_ERROR, "Write error %d on device \"%s\"\n", | |
1151 | write_wc.wc_error, reg->hr_dev_name); | |
d2eece37 SM |
1152 | ret = write_wc.wc_error; |
1153 | goto bail; | |
a9e2ae39 MF |
1154 | } |
1155 | ||
d2eece37 SM |
1156 | /* Skip disarming the timeout if own slot has stale/bad data */ |
1157 | if (own_slot_ok) { | |
1158 | o2hb_set_quorum_device(reg); | |
e0cbb798 | 1159 | o2hb_arm_timeout(reg); |
6633ca57 | 1160 | reg->hr_last_timeout_start = jiffies; |
d2eece37 | 1161 | } |
a7f6a5fb | 1162 | |
d2eece37 | 1163 | bail: |
a7f6a5fb | 1164 | /* let the person who launched us know when things are steady */ |
d2eece37 SM |
1165 | if (atomic_read(®->hr_steady_iterations) != 0) { |
1166 | if (!ret && own_slot_ok && !membership_change) { | |
1167 | if (atomic_dec_and_test(®->hr_steady_iterations)) | |
1168 | wake_up(&o2hb_steady_queue); | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
1173 | if (atomic_dec_and_test(®->hr_unsteady_iterations)) { | |
1174 | printk(KERN_NOTICE "o2hb: Unable to stabilize " | |
e926d8a1 | 1175 | "heartbeat on region %s (%s)\n", |
d2eece37 SM |
1176 | config_item_name(®->hr_item), |
1177 | reg->hr_dev_name); | |
1178 | atomic_set(®->hr_steady_iterations, 0); | |
1179 | reg->hr_aborted_start = 1; | |
a7f6a5fb | 1180 | wake_up(&o2hb_steady_queue); |
d2eece37 SM |
1181 | ret = -EIO; |
1182 | } | |
a7f6a5fb | 1183 | } |
a9e2ae39 | 1184 | |
d2eece37 | 1185 | return ret; |
a7f6a5fb MF |
1186 | } |
1187 | ||
a7f6a5fb MF |
1188 | /* |
1189 | * we ride the region ref that the region dir holds. before the region | |
1190 | * dir is removed and drops it ref it will wait to tear down this | |
1191 | * thread. | |
1192 | */ | |
1193 | static int o2hb_thread(void *data) | |
1194 | { | |
1195 | int i, ret; | |
1196 | struct o2hb_region *reg = data; | |
a7f6a5fb | 1197 | struct o2hb_bio_wait_ctxt write_wc; |
40476b82 | 1198 | ktime_t before_hb, after_hb; |
a7f6a5fb MF |
1199 | unsigned int elapsed_msec; |
1200 | ||
1201 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); | |
1202 | ||
8698a745 | 1203 | set_user_nice(current, MIN_NICE); |
a7f6a5fb | 1204 | |
cfc069d3 | 1205 | /* Pin node */ |
0986fe9b JQ |
1206 | ret = o2nm_depend_this_node(); |
1207 | if (ret) { | |
1208 | mlog(ML_ERROR, "Node has been deleted, ret = %d\n", ret); | |
1209 | reg->hr_node_deleted = 1; | |
1210 | wake_up(&o2hb_steady_queue); | |
1211 | return 0; | |
1212 | } | |
cfc069d3 | 1213 | |
d2eece37 SM |
1214 | while (!kthread_should_stop() && |
1215 | !reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
a7f6a5fb | 1216 | /* We track the time spent inside |
025dfdaf | 1217 | * o2hb_do_disk_heartbeat so that we avoid more than |
a7f6a5fb MF |
1218 | * hr_timeout_ms between disk writes. On busy systems |
1219 | * this should result in a heartbeat which is less | |
1220 | * likely to time itself out. */ | |
40476b82 | 1221 | before_hb = ktime_get_real(); |
a7f6a5fb | 1222 | |
d2eece37 | 1223 | ret = o2hb_do_disk_heartbeat(reg); |
88dbe98d | 1224 | reg->hr_last_hb_status = ret; |
a7f6a5fb | 1225 | |
40476b82 TR |
1226 | after_hb = ktime_get_real(); |
1227 | ||
1228 | elapsed_msec = (unsigned int) | |
1229 | ktime_ms_delta(after_hb, before_hb); | |
a7f6a5fb | 1230 | |
b31d308d | 1231 | mlog(ML_HEARTBEAT, |
40476b82 | 1232 | "start = %lld, end = %lld, msec = %u, ret = %d\n", |
2456e855 | 1233 | before_hb, after_hb, elapsed_msec, ret); |
a7f6a5fb | 1234 | |
d2eece37 SM |
1235 | if (!kthread_should_stop() && |
1236 | elapsed_msec < reg->hr_timeout_ms) { | |
a7f6a5fb MF |
1237 | /* the kthread api has blocked signals for us so no |
1238 | * need to record the return value. */ | |
1239 | msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); | |
1240 | } | |
1241 | } | |
1242 | ||
e0cbb798 | 1243 | o2hb_disarm_timeout(reg); |
a7f6a5fb MF |
1244 | |
1245 | /* unclean stop is only used in very bad situation */ | |
1246 | for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) | |
1247 | o2hb_shutdown_slot(®->hr_slots[i]); | |
1248 | ||
1249 | /* Explicit down notification - avoid forcing the other nodes | |
1250 | * to timeout on this region when we could just as easily | |
1251 | * write a clear generation - thus indicating to them that | |
1252 | * this node has left this region. | |
d2eece37 SM |
1253 | */ |
1254 | if (!reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
1255 | o2hb_prepare_block(reg, 0); | |
1256 | ret = o2hb_issue_node_write(reg, &write_wc); | |
1257 | if (ret == 0) | |
964f14a0 | 1258 | o2hb_wait_on_io(&write_wc); |
d2eece37 SM |
1259 | else |
1260 | mlog_errno(ret); | |
a7f6a5fb MF |
1261 | } |
1262 | ||
cfc069d3 SM |
1263 | /* Unpin node */ |
1264 | o2nm_undepend_this_node(); | |
a7f6a5fb | 1265 | |
d2eece37 | 1266 | mlog(ML_HEARTBEAT|ML_KTHREAD, "o2hb thread exiting\n"); |
a7f6a5fb MF |
1267 | |
1268 | return 0; | |
1269 | } | |
1270 | ||
87d3d3f3 SM |
1271 | #ifdef CONFIG_DEBUG_FS |
1272 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1273 | { | |
8ca8b0bb | 1274 | struct o2hb_debug_buf *db = inode->i_private; |
1f285305 | 1275 | struct o2hb_region *reg; |
87d3d3f3 | 1276 | unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
bb570a5d | 1277 | unsigned long lts; |
87d3d3f3 SM |
1278 | char *buf = NULL; |
1279 | int i = -1; | |
1280 | int out = 0; | |
1281 | ||
8ca8b0bb SM |
1282 | /* max_nodes should be the largest bitmap we pass here */ |
1283 | BUG_ON(sizeof(map) < db->db_size); | |
1284 | ||
87d3d3f3 SM |
1285 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
1286 | if (!buf) | |
1287 | goto bail; | |
1288 | ||
8ca8b0bb SM |
1289 | switch (db->db_type) { |
1290 | case O2HB_DB_TYPE_LIVENODES: | |
a6de0136 SM |
1291 | case O2HB_DB_TYPE_LIVEREGIONS: |
1292 | case O2HB_DB_TYPE_QUORUMREGIONS: | |
1293 | case O2HB_DB_TYPE_FAILEDREGIONS: | |
8ca8b0bb SM |
1294 | spin_lock(&o2hb_live_lock); |
1295 | memcpy(map, db->db_data, db->db_size); | |
1296 | spin_unlock(&o2hb_live_lock); | |
1297 | break; | |
87d3d3f3 | 1298 | |
1f285305 SM |
1299 | case O2HB_DB_TYPE_REGION_LIVENODES: |
1300 | spin_lock(&o2hb_live_lock); | |
1301 | reg = (struct o2hb_region *)db->db_data; | |
1302 | memcpy(map, reg->hr_live_node_bitmap, db->db_size); | |
1303 | spin_unlock(&o2hb_live_lock); | |
1304 | break; | |
1305 | ||
1306 | case O2HB_DB_TYPE_REGION_NUMBER: | |
1307 | reg = (struct o2hb_region *)db->db_data; | |
d293d3af | 1308 | out += scnprintf(buf + out, PAGE_SIZE - out, "%d\n", |
1f285305 SM |
1309 | reg->hr_region_num); |
1310 | goto done; | |
1311 | ||
43695d09 SM |
1312 | case O2HB_DB_TYPE_REGION_ELAPSED_TIME: |
1313 | reg = (struct o2hb_region *)db->db_data; | |
bb570a5d SM |
1314 | lts = reg->hr_last_timeout_start; |
1315 | /* If 0, it has never been set before */ | |
1316 | if (lts) | |
1317 | lts = jiffies_to_msecs(jiffies - lts); | |
d293d3af | 1318 | out += scnprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); |
43695d09 SM |
1319 | goto done; |
1320 | ||
cb0586bd SM |
1321 | case O2HB_DB_TYPE_REGION_PINNED: |
1322 | reg = (struct o2hb_region *)db->db_data; | |
d293d3af | 1323 | out += scnprintf(buf + out, PAGE_SIZE - out, "%u\n", |
cb0586bd SM |
1324 | !!reg->hr_item_pinned); |
1325 | goto done; | |
1326 | ||
8ca8b0bb SM |
1327 | default: |
1328 | goto done; | |
1329 | } | |
1330 | ||
1331 | while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len) | |
d293d3af TI |
1332 | out += scnprintf(buf + out, PAGE_SIZE - out, "%d ", i); |
1333 | out += scnprintf(buf + out, PAGE_SIZE - out, "\n"); | |
87d3d3f3 | 1334 | |
8ca8b0bb | 1335 | done: |
87d3d3f3 SM |
1336 | i_size_write(inode, out); |
1337 | ||
1338 | file->private_data = buf; | |
1339 | ||
1340 | return 0; | |
1341 | bail: | |
1342 | return -ENOMEM; | |
1343 | } | |
1344 | ||
1345 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1346 | { | |
1347 | kfree(file->private_data); | |
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1352 | size_t nbytes, loff_t *ppos) | |
1353 | { | |
1354 | return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, | |
1355 | i_size_read(file->f_mapping->host)); | |
1356 | } | |
1357 | #else | |
1358 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1359 | { | |
1360 | return 0; | |
1361 | } | |
1362 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1363 | { | |
1364 | return 0; | |
1365 | } | |
1366 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1367 | size_t nbytes, loff_t *ppos) | |
1368 | { | |
1369 | return 0; | |
1370 | } | |
1371 | #endif /* CONFIG_DEBUG_FS */ | |
1372 | ||
828c0950 | 1373 | static const struct file_operations o2hb_debug_fops = { |
87d3d3f3 SM |
1374 | .open = o2hb_debug_open, |
1375 | .release = o2hb_debug_release, | |
1376 | .read = o2hb_debug_read, | |
1377 | .llseek = generic_file_llseek, | |
1378 | }; | |
1379 | ||
1380 | void o2hb_exit(void) | |
1381 | { | |
e581595e | 1382 | debugfs_remove_recursive(o2hb_debug_dir); |
a4a1dfa4 JQ |
1383 | kfree(o2hb_db_livenodes); |
1384 | kfree(o2hb_db_liveregions); | |
1385 | kfree(o2hb_db_quorumregions); | |
1386 | kfree(o2hb_db_failedregions); | |
8ca8b0bb SM |
1387 | } |
1388 | ||
5e7a3ed9 GKH |
1389 | static void o2hb_debug_create(const char *name, struct dentry *dir, |
1390 | struct o2hb_debug_buf **db, int db_len, int type, | |
1391 | int size, int len, void *data) | |
8ca8b0bb SM |
1392 | { |
1393 | *db = kmalloc(db_len, GFP_KERNEL); | |
1394 | if (!*db) | |
5e7a3ed9 | 1395 | return; |
8ca8b0bb SM |
1396 | |
1397 | (*db)->db_type = type; | |
1398 | (*db)->db_size = size; | |
1399 | (*db)->db_len = len; | |
1400 | (*db)->db_data = data; | |
1401 | ||
5e7a3ed9 | 1402 | debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db, &o2hb_debug_fops); |
8ca8b0bb SM |
1403 | } |
1404 | ||
e581595e | 1405 | static void o2hb_debug_init(void) |
8ca8b0bb | 1406 | { |
8ca8b0bb | 1407 | o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL); |
a6de0136 | 1408 | |
e581595e GKH |
1409 | o2hb_debug_create(O2HB_DEBUG_LIVENODES, o2hb_debug_dir, |
1410 | &o2hb_db_livenodes, sizeof(*o2hb_db_livenodes), | |
1411 | O2HB_DB_TYPE_LIVENODES, sizeof(o2hb_live_node_bitmap), | |
1412 | O2NM_MAX_NODES, o2hb_live_node_bitmap); | |
1413 | ||
1414 | o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS, o2hb_debug_dir, | |
1415 | &o2hb_db_liveregions, sizeof(*o2hb_db_liveregions), | |
1416 | O2HB_DB_TYPE_LIVEREGIONS, | |
1417 | sizeof(o2hb_live_region_bitmap), O2NM_MAX_REGIONS, | |
1418 | o2hb_live_region_bitmap); | |
1419 | ||
1420 | o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS, o2hb_debug_dir, | |
1421 | &o2hb_db_quorumregions, | |
1422 | sizeof(*o2hb_db_quorumregions), | |
1423 | O2HB_DB_TYPE_QUORUMREGIONS, | |
1424 | sizeof(o2hb_quorum_region_bitmap), O2NM_MAX_REGIONS, | |
1425 | o2hb_quorum_region_bitmap); | |
1426 | ||
1427 | o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS, o2hb_debug_dir, | |
1428 | &o2hb_db_failedregions, | |
1429 | sizeof(*o2hb_db_failedregions), | |
1430 | O2HB_DB_TYPE_FAILEDREGIONS, | |
1431 | sizeof(o2hb_failed_region_bitmap), O2NM_MAX_REGIONS, | |
1432 | o2hb_failed_region_bitmap); | |
87d3d3f3 SM |
1433 | } |
1434 | ||
e581595e | 1435 | void o2hb_init(void) |
a7f6a5fb MF |
1436 | { |
1437 | int i; | |
1438 | ||
1439 | for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) | |
1440 | INIT_LIST_HEAD(&o2hb_callbacks[i].list); | |
1441 | ||
1442 | for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) | |
1443 | INIT_LIST_HEAD(&o2hb_live_slots[i]); | |
1444 | ||
1445 | INIT_LIST_HEAD(&o2hb_node_events); | |
1446 | ||
1447 | memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap)); | |
536f0741 | 1448 | memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap)); |
e7d656ba | 1449 | memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap)); |
43182d2a | 1450 | memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap)); |
b1c5ebfb | 1451 | memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap)); |
87d3d3f3 | 1452 | |
58a3158a SM |
1453 | o2hb_dependent_users = 0; |
1454 | ||
e581595e | 1455 | o2hb_debug_init(); |
a7f6a5fb MF |
1456 | } |
1457 | ||
1458 | /* if we're already in a callback then we're already serialized by the sem */ | |
1459 | static void o2hb_fill_node_map_from_callback(unsigned long *map, | |
1460 | unsigned bytes) | |
1461 | { | |
1462 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); | |
1463 | ||
1464 | memcpy(map, &o2hb_live_node_bitmap, bytes); | |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * get a map of all nodes that are heartbeating in any regions | |
1469 | */ | |
1470 | void o2hb_fill_node_map(unsigned long *map, unsigned bytes) | |
1471 | { | |
1472 | /* callers want to serialize this map and callbacks so that they | |
1473 | * can trust that they don't miss nodes coming to the party */ | |
1474 | down_read(&o2hb_callback_sem); | |
1475 | spin_lock(&o2hb_live_lock); | |
1476 | o2hb_fill_node_map_from_callback(map, bytes); | |
1477 | spin_unlock(&o2hb_live_lock); | |
1478 | up_read(&o2hb_callback_sem); | |
1479 | } | |
1480 | EXPORT_SYMBOL_GPL(o2hb_fill_node_map); | |
1481 | ||
1482 | /* | |
1483 | * heartbeat configfs bits. The heartbeat set is a default set under | |
1484 | * the cluster set in nodemanager.c. | |
1485 | */ | |
1486 | ||
1487 | static struct o2hb_region *to_o2hb_region(struct config_item *item) | |
1488 | { | |
1489 | return item ? container_of(item, struct o2hb_region, hr_item) : NULL; | |
1490 | } | |
1491 | ||
1492 | /* drop_item only drops its ref after killing the thread, nothing should | |
1493 | * be using the region anymore. this has to clean up any state that | |
1494 | * attributes might have built up. */ | |
1495 | static void o2hb_region_release(struct config_item *item) | |
1496 | { | |
1497 | int i; | |
1498 | struct page *page; | |
1499 | struct o2hb_region *reg = to_o2hb_region(item); | |
1500 | ||
d2eece37 SM |
1501 | mlog(ML_HEARTBEAT, "hb region release (%s)\n", reg->hr_dev_name); |
1502 | ||
d787ab09 | 1503 | kfree(reg->hr_tmp_block); |
a7f6a5fb MF |
1504 | |
1505 | if (reg->hr_slot_data) { | |
1506 | for (i = 0; i < reg->hr_num_pages; i++) { | |
1507 | page = reg->hr_slot_data[i]; | |
1508 | if (page) | |
1509 | __free_page(page); | |
1510 | } | |
1511 | kfree(reg->hr_slot_data); | |
1512 | } | |
1513 | ||
1514 | if (reg->hr_bdev) | |
9a1c3542 | 1515 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb | 1516 | |
d787ab09 | 1517 | kfree(reg->hr_slots); |
a7f6a5fb | 1518 | |
5e7a3ed9 | 1519 | debugfs_remove_recursive(reg->hr_debug_dir); |
a4a1dfa4 JQ |
1520 | kfree(reg->hr_db_livenodes); |
1521 | kfree(reg->hr_db_regnum); | |
9e13f1f9 JB |
1522 | kfree(reg->hr_db_elapsed_time); |
1523 | kfree(reg->hr_db_pinned); | |
1f285305 | 1524 | |
a7f6a5fb MF |
1525 | spin_lock(&o2hb_live_lock); |
1526 | list_del(®->hr_all_item); | |
1527 | spin_unlock(&o2hb_live_lock); | |
1528 | ||
34069b88 | 1529 | o2net_unregister_handler_list(®->hr_handler_list); |
a7f6a5fb MF |
1530 | kfree(reg); |
1531 | } | |
1532 | ||
1533 | static int o2hb_read_block_input(struct o2hb_region *reg, | |
1534 | const char *page, | |
a7f6a5fb MF |
1535 | unsigned long *ret_bytes, |
1536 | unsigned int *ret_bits) | |
1537 | { | |
1538 | unsigned long bytes; | |
1539 | char *p = (char *)page; | |
1540 | ||
1541 | bytes = simple_strtoul(p, &p, 0); | |
1542 | if (!p || (*p && (*p != '\n'))) | |
1543 | return -EINVAL; | |
1544 | ||
1545 | /* Heartbeat and fs min / max block sizes are the same. */ | |
1546 | if (bytes > 4096 || bytes < 512) | |
1547 | return -ERANGE; | |
1548 | if (hweight16(bytes) != 1) | |
1549 | return -EINVAL; | |
1550 | ||
1551 | if (ret_bytes) | |
1552 | *ret_bytes = bytes; | |
1553 | if (ret_bits) | |
1554 | *ret_bits = ffs(bytes) - 1; | |
1555 | ||
1556 | return 0; | |
1557 | } | |
1558 | ||
45b99773 | 1559 | static ssize_t o2hb_region_block_bytes_show(struct config_item *item, |
a7f6a5fb MF |
1560 | char *page) |
1561 | { | |
45b99773 | 1562 | return sprintf(page, "%u\n", to_o2hb_region(item)->hr_block_bytes); |
a7f6a5fb MF |
1563 | } |
1564 | ||
45b99773 | 1565 | static ssize_t o2hb_region_block_bytes_store(struct config_item *item, |
a7f6a5fb MF |
1566 | const char *page, |
1567 | size_t count) | |
1568 | { | |
45b99773 | 1569 | struct o2hb_region *reg = to_o2hb_region(item); |
a7f6a5fb MF |
1570 | int status; |
1571 | unsigned long block_bytes; | |
1572 | unsigned int block_bits; | |
1573 | ||
1574 | if (reg->hr_bdev) | |
1575 | return -EINVAL; | |
1576 | ||
aa6913db JP |
1577 | status = o2hb_read_block_input(reg, page, &block_bytes, |
1578 | &block_bits); | |
a7f6a5fb MF |
1579 | if (status) |
1580 | return status; | |
1581 | ||
1582 | reg->hr_block_bytes = (unsigned int)block_bytes; | |
1583 | reg->hr_block_bits = block_bits; | |
1584 | ||
1585 | return count; | |
1586 | } | |
1587 | ||
45b99773 | 1588 | static ssize_t o2hb_region_start_block_show(struct config_item *item, |
a7f6a5fb MF |
1589 | char *page) |
1590 | { | |
45b99773 | 1591 | return sprintf(page, "%llu\n", to_o2hb_region(item)->hr_start_block); |
a7f6a5fb MF |
1592 | } |
1593 | ||
45b99773 | 1594 | static ssize_t o2hb_region_start_block_store(struct config_item *item, |
a7f6a5fb MF |
1595 | const char *page, |
1596 | size_t count) | |
1597 | { | |
45b99773 | 1598 | struct o2hb_region *reg = to_o2hb_region(item); |
a7f6a5fb MF |
1599 | unsigned long long tmp; |
1600 | char *p = (char *)page; | |
1601 | ||
1602 | if (reg->hr_bdev) | |
1603 | return -EINVAL; | |
1604 | ||
1605 | tmp = simple_strtoull(p, &p, 0); | |
1606 | if (!p || (*p && (*p != '\n'))) | |
1607 | return -EINVAL; | |
1608 | ||
1609 | reg->hr_start_block = tmp; | |
1610 | ||
1611 | return count; | |
1612 | } | |
1613 | ||
45b99773 | 1614 | static ssize_t o2hb_region_blocks_show(struct config_item *item, char *page) |
a7f6a5fb | 1615 | { |
45b99773 | 1616 | return sprintf(page, "%d\n", to_o2hb_region(item)->hr_blocks); |
a7f6a5fb MF |
1617 | } |
1618 | ||
45b99773 | 1619 | static ssize_t o2hb_region_blocks_store(struct config_item *item, |
a7f6a5fb MF |
1620 | const char *page, |
1621 | size_t count) | |
1622 | { | |
45b99773 | 1623 | struct o2hb_region *reg = to_o2hb_region(item); |
a7f6a5fb MF |
1624 | unsigned long tmp; |
1625 | char *p = (char *)page; | |
1626 | ||
1627 | if (reg->hr_bdev) | |
1628 | return -EINVAL; | |
1629 | ||
1630 | tmp = simple_strtoul(p, &p, 0); | |
1631 | if (!p || (*p && (*p != '\n'))) | |
1632 | return -EINVAL; | |
1633 | ||
1634 | if (tmp > O2NM_MAX_NODES || tmp == 0) | |
1635 | return -ERANGE; | |
1636 | ||
1637 | reg->hr_blocks = (unsigned int)tmp; | |
1638 | ||
1639 | return count; | |
1640 | } | |
1641 | ||
45b99773 | 1642 | static ssize_t o2hb_region_dev_show(struct config_item *item, char *page) |
a7f6a5fb MF |
1643 | { |
1644 | unsigned int ret = 0; | |
1645 | ||
45b99773 CH |
1646 | if (to_o2hb_region(item)->hr_bdev) |
1647 | ret = sprintf(page, "%s\n", to_o2hb_region(item)->hr_dev_name); | |
a7f6a5fb MF |
1648 | |
1649 | return ret; | |
1650 | } | |
1651 | ||
1652 | static void o2hb_init_region_params(struct o2hb_region *reg) | |
1653 | { | |
09cbfeaf | 1654 | reg->hr_slots_per_page = PAGE_SIZE >> reg->hr_block_bits; |
a7f6a5fb MF |
1655 | reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; |
1656 | ||
1657 | mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", | |
1658 | reg->hr_start_block, reg->hr_blocks); | |
1659 | mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", | |
1660 | reg->hr_block_bytes, reg->hr_block_bits); | |
1661 | mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); | |
1662 | mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); | |
1663 | } | |
1664 | ||
1665 | static int o2hb_map_slot_data(struct o2hb_region *reg) | |
1666 | { | |
1667 | int i, j; | |
1668 | unsigned int last_slot; | |
1669 | unsigned int spp = reg->hr_slots_per_page; | |
1670 | struct page *page; | |
1671 | char *raw; | |
1672 | struct o2hb_disk_slot *slot; | |
1673 | ||
1674 | reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); | |
372a447c | 1675 | if (reg->hr_tmp_block == NULL) |
a7f6a5fb | 1676 | return -ENOMEM; |
a7f6a5fb MF |
1677 | |
1678 | reg->hr_slots = kcalloc(reg->hr_blocks, | |
1679 | sizeof(struct o2hb_disk_slot), GFP_KERNEL); | |
372a447c | 1680 | if (reg->hr_slots == NULL) |
a7f6a5fb | 1681 | return -ENOMEM; |
a7f6a5fb MF |
1682 | |
1683 | for(i = 0; i < reg->hr_blocks; i++) { | |
1684 | slot = ®->hr_slots[i]; | |
1685 | slot->ds_node_num = i; | |
1686 | INIT_LIST_HEAD(&slot->ds_live_item); | |
1687 | slot->ds_raw_block = NULL; | |
1688 | } | |
1689 | ||
1690 | reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; | |
1691 | mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " | |
1692 | "at %u blocks per page\n", | |
1693 | reg->hr_num_pages, reg->hr_blocks, spp); | |
1694 | ||
1695 | reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), | |
1696 | GFP_KERNEL); | |
372a447c | 1697 | if (!reg->hr_slot_data) |
a7f6a5fb | 1698 | return -ENOMEM; |
a7f6a5fb MF |
1699 | |
1700 | for(i = 0; i < reg->hr_num_pages; i++) { | |
1701 | page = alloc_page(GFP_KERNEL); | |
372a447c | 1702 | if (!page) |
a7f6a5fb | 1703 | return -ENOMEM; |
a7f6a5fb MF |
1704 | |
1705 | reg->hr_slot_data[i] = page; | |
1706 | ||
1707 | last_slot = i * spp; | |
1708 | raw = page_address(page); | |
1709 | for (j = 0; | |
1710 | (j < spp) && ((j + last_slot) < reg->hr_blocks); | |
1711 | j++) { | |
1712 | BUG_ON((j + last_slot) >= reg->hr_blocks); | |
1713 | ||
1714 | slot = ®->hr_slots[j + last_slot]; | |
1715 | slot->ds_raw_block = | |
1716 | (struct o2hb_disk_heartbeat_block *) raw; | |
1717 | ||
1718 | raw += reg->hr_block_bytes; | |
1719 | } | |
1720 | } | |
1721 | ||
1722 | return 0; | |
1723 | } | |
1724 | ||
1725 | /* Read in all the slots available and populate the tracking | |
1726 | * structures so that we can start with a baseline idea of what's | |
1727 | * there. */ | |
1728 | static int o2hb_populate_slot_data(struct o2hb_region *reg) | |
1729 | { | |
1730 | int ret, i; | |
1731 | struct o2hb_disk_slot *slot; | |
1732 | struct o2hb_disk_heartbeat_block *hb_block; | |
1733 | ||
874b1ef0 | 1734 | ret = o2hb_read_slots(reg, 0, reg->hr_blocks); |
372a447c | 1735 | if (ret) |
a7f6a5fb | 1736 | goto out; |
a7f6a5fb MF |
1737 | |
1738 | /* We only want to get an idea of the values initially in each | |
1739 | * slot, so we do no verification - o2hb_check_slot will | |
1740 | * actually determine if each configured slot is valid and | |
1741 | * whether any values have changed. */ | |
1742 | for(i = 0; i < reg->hr_blocks; i++) { | |
1743 | slot = ®->hr_slots[i]; | |
1744 | hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; | |
1745 | ||
1746 | /* Only fill the values that o2hb_check_slot uses to | |
1747 | * determine changing slots */ | |
1748 | slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); | |
1749 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
1750 | } | |
1751 | ||
1752 | out: | |
a7f6a5fb MF |
1753 | return ret; |
1754 | } | |
1755 | ||
1756 | /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */ | |
45b99773 | 1757 | static ssize_t o2hb_region_dev_store(struct config_item *item, |
a7f6a5fb MF |
1758 | const char *page, |
1759 | size_t count) | |
1760 | { | |
45b99773 | 1761 | struct o2hb_region *reg = to_o2hb_region(item); |
e6c352db | 1762 | struct task_struct *hb_task; |
a7f6a5fb MF |
1763 | long fd; |
1764 | int sectsize; | |
1765 | char *p = (char *)page; | |
2903ff01 | 1766 | struct fd f; |
a7f6a5fb | 1767 | ssize_t ret = -EINVAL; |
76d9fc29 | 1768 | int live_threshold; |
a7f6a5fb MF |
1769 | |
1770 | if (reg->hr_bdev) | |
1771 | goto out; | |
1772 | ||
1773 | /* We can't heartbeat without having had our node number | |
1774 | * configured yet. */ | |
1775 | if (o2nm_this_node() == O2NM_MAX_NODES) | |
1776 | goto out; | |
1777 | ||
1778 | fd = simple_strtol(p, &p, 0); | |
1779 | if (!p || (*p && (*p != '\n'))) | |
1780 | goto out; | |
1781 | ||
1782 | if (fd < 0 || fd >= INT_MAX) | |
1783 | goto out; | |
1784 | ||
2903ff01 AV |
1785 | f = fdget(fd); |
1786 | if (f.file == NULL) | |
a7f6a5fb MF |
1787 | goto out; |
1788 | ||
1789 | if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || | |
1790 | reg->hr_block_bytes == 0) | |
2903ff01 | 1791 | goto out2; |
a7f6a5fb | 1792 | |
e455ed22 | 1793 | if (!S_ISBLK(f.file->f_mapping->host->i_mode)) |
2903ff01 | 1794 | goto out2; |
a7f6a5fb | 1795 | |
e455ed22 CH |
1796 | reg->hr_bdev = blkdev_get_by_dev(f.file->f_mapping->host->i_rdev, |
1797 | FMODE_WRITE | FMODE_READ, NULL); | |
1798 | if (IS_ERR(reg->hr_bdev)) { | |
1799 | ret = PTR_ERR(reg->hr_bdev); | |
a7f6a5fb | 1800 | reg->hr_bdev = NULL; |
e455ed22 | 1801 | goto out2; |
a7f6a5fb | 1802 | } |
a7f6a5fb MF |
1803 | |
1804 | bdevname(reg->hr_bdev, reg->hr_dev_name); | |
1805 | ||
e1defc4f | 1806 | sectsize = bdev_logical_block_size(reg->hr_bdev); |
a7f6a5fb MF |
1807 | if (sectsize != reg->hr_block_bytes) { |
1808 | mlog(ML_ERROR, | |
1809 | "blocksize %u incorrect for device, expected %d", | |
1810 | reg->hr_block_bytes, sectsize); | |
1811 | ret = -EINVAL; | |
2903ff01 | 1812 | goto out3; |
a7f6a5fb MF |
1813 | } |
1814 | ||
1815 | o2hb_init_region_params(reg); | |
1816 | ||
1817 | /* Generation of zero is invalid */ | |
1818 | do { | |
1819 | get_random_bytes(®->hr_generation, | |
1820 | sizeof(reg->hr_generation)); | |
1821 | } while (reg->hr_generation == 0); | |
1822 | ||
1823 | ret = o2hb_map_slot_data(reg); | |
1824 | if (ret) { | |
1825 | mlog_errno(ret); | |
2903ff01 | 1826 | goto out3; |
a7f6a5fb MF |
1827 | } |
1828 | ||
1829 | ret = o2hb_populate_slot_data(reg); | |
1830 | if (ret) { | |
1831 | mlog_errno(ret); | |
2903ff01 | 1832 | goto out3; |
a7f6a5fb MF |
1833 | } |
1834 | ||
c4028958 | 1835 | INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout); |
e0cbb798 | 1836 | INIT_DELAYED_WORK(®->hr_nego_timeout_work, o2hb_nego_timeout); |
a7f6a5fb MF |
1837 | |
1838 | /* | |
1839 | * A node is considered live after it has beat LIVE_THRESHOLD | |
1840 | * times. We're not steady until we've given them a chance | |
1841 | * _after_ our first read. | |
76d9fc29 SM |
1842 | * The default threshold is bare minimum so as to limit the delay |
1843 | * during mounts. For global heartbeat, the threshold doubled for the | |
1844 | * first region. | |
a7f6a5fb | 1845 | */ |
76d9fc29 SM |
1846 | live_threshold = O2HB_LIVE_THRESHOLD; |
1847 | if (o2hb_global_heartbeat_active()) { | |
1848 | spin_lock(&o2hb_live_lock); | |
a8f70de3 | 1849 | if (bitmap_weight(o2hb_region_bitmap, O2NM_MAX_REGIONS) == 1) |
76d9fc29 SM |
1850 | live_threshold <<= 1; |
1851 | spin_unlock(&o2hb_live_lock); | |
1852 | } | |
d2eece37 SM |
1853 | ++live_threshold; |
1854 | atomic_set(®->hr_steady_iterations, live_threshold); | |
a84ac334 JB |
1855 | /* unsteady_iterations is triple the steady_iterations */ |
1856 | atomic_set(®->hr_unsteady_iterations, (live_threshold * 3)); | |
a7f6a5fb | 1857 | |
e6c352db JB |
1858 | hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s", |
1859 | reg->hr_item.ci_name); | |
1860 | if (IS_ERR(hb_task)) { | |
1861 | ret = PTR_ERR(hb_task); | |
a7f6a5fb | 1862 | mlog_errno(ret); |
2903ff01 | 1863 | goto out3; |
a7f6a5fb MF |
1864 | } |
1865 | ||
e6c352db JB |
1866 | spin_lock(&o2hb_live_lock); |
1867 | reg->hr_task = hb_task; | |
1868 | spin_unlock(&o2hb_live_lock); | |
1869 | ||
a7f6a5fb | 1870 | ret = wait_event_interruptible(o2hb_steady_queue, |
0986fe9b JQ |
1871 | atomic_read(®->hr_steady_iterations) == 0 || |
1872 | reg->hr_node_deleted); | |
a7f6a5fb | 1873 | if (ret) { |
d2eece37 SM |
1874 | atomic_set(®->hr_steady_iterations, 0); |
1875 | reg->hr_aborted_start = 1; | |
1876 | } | |
e6c352db | 1877 | |
d2eece37 SM |
1878 | if (reg->hr_aborted_start) { |
1879 | ret = -EIO; | |
2903ff01 | 1880 | goto out3; |
a7f6a5fb MF |
1881 | } |
1882 | ||
0986fe9b JQ |
1883 | if (reg->hr_node_deleted) { |
1884 | ret = -EINVAL; | |
1885 | goto out3; | |
1886 | } | |
1887 | ||
e6df3a66 JB |
1888 | /* Ok, we were woken. Make sure it wasn't by drop_item() */ |
1889 | spin_lock(&o2hb_live_lock); | |
1890 | hb_task = reg->hr_task; | |
e7d656ba SM |
1891 | if (o2hb_global_heartbeat_active()) |
1892 | set_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
e6df3a66 JB |
1893 | spin_unlock(&o2hb_live_lock); |
1894 | ||
1895 | if (hb_task) | |
1896 | ret = count; | |
1897 | else | |
1898 | ret = -EIO; | |
1899 | ||
18c50cb0 | 1900 | if (hb_task && o2hb_global_heartbeat_active()) |
d2eece37 SM |
1901 | printk(KERN_NOTICE "o2hb: Heartbeat started on region %s (%s)\n", |
1902 | config_item_name(®->hr_item), reg->hr_dev_name); | |
18c50cb0 | 1903 | |
2903ff01 | 1904 | out3: |
e455ed22 CH |
1905 | if (ret < 0) { |
1906 | blkdev_put(reg->hr_bdev, FMODE_READ | FMODE_WRITE); | |
1907 | reg->hr_bdev = NULL; | |
1908 | } | |
2903ff01 AV |
1909 | out2: |
1910 | fdput(f); | |
a7f6a5fb | 1911 | out: |
a7f6a5fb MF |
1912 | return ret; |
1913 | } | |
1914 | ||
45b99773 | 1915 | static ssize_t o2hb_region_pid_show(struct config_item *item, char *page) |
92efc152 | 1916 | { |
45b99773 | 1917 | struct o2hb_region *reg = to_o2hb_region(item); |
e6c352db JB |
1918 | pid_t pid = 0; |
1919 | ||
1920 | spin_lock(&o2hb_live_lock); | |
1921 | if (reg->hr_task) | |
ba25f9dc | 1922 | pid = task_pid_nr(reg->hr_task); |
e6c352db JB |
1923 | spin_unlock(&o2hb_live_lock); |
1924 | ||
1925 | if (!pid) | |
92efc152 ZW |
1926 | return 0; |
1927 | ||
e6c352db | 1928 | return sprintf(page, "%u\n", pid); |
92efc152 ZW |
1929 | } |
1930 | ||
45b99773 CH |
1931 | CONFIGFS_ATTR(o2hb_region_, block_bytes); |
1932 | CONFIGFS_ATTR(o2hb_region_, start_block); | |
1933 | CONFIGFS_ATTR(o2hb_region_, blocks); | |
1934 | CONFIGFS_ATTR(o2hb_region_, dev); | |
1935 | CONFIGFS_ATTR_RO(o2hb_region_, pid); | |
92efc152 | 1936 | |
a7f6a5fb | 1937 | static struct configfs_attribute *o2hb_region_attrs[] = { |
45b99773 CH |
1938 | &o2hb_region_attr_block_bytes, |
1939 | &o2hb_region_attr_start_block, | |
1940 | &o2hb_region_attr_blocks, | |
1941 | &o2hb_region_attr_dev, | |
1942 | &o2hb_region_attr_pid, | |
a7f6a5fb MF |
1943 | NULL, |
1944 | }; | |
1945 | ||
a7f6a5fb MF |
1946 | static struct configfs_item_operations o2hb_region_item_ops = { |
1947 | .release = o2hb_region_release, | |
a7f6a5fb MF |
1948 | }; |
1949 | ||
4843afe4 | 1950 | static const struct config_item_type o2hb_region_type = { |
a7f6a5fb MF |
1951 | .ct_item_ops = &o2hb_region_item_ops, |
1952 | .ct_attrs = o2hb_region_attrs, | |
1953 | .ct_owner = THIS_MODULE, | |
1954 | }; | |
1955 | ||
1956 | /* heartbeat set */ | |
1957 | ||
1958 | struct o2hb_heartbeat_group { | |
1959 | struct config_group hs_group; | |
1960 | /* some stuff? */ | |
1961 | }; | |
1962 | ||
1963 | static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) | |
1964 | { | |
1965 | return group ? | |
1966 | container_of(group, struct o2hb_heartbeat_group, hs_group) | |
1967 | : NULL; | |
1968 | } | |
1969 | ||
5e7a3ed9 GKH |
1970 | static void o2hb_debug_region_init(struct o2hb_region *reg, |
1971 | struct dentry *parent) | |
1f285305 | 1972 | { |
5e7a3ed9 | 1973 | struct dentry *dir; |
1f285305 | 1974 | |
5e7a3ed9 GKH |
1975 | dir = debugfs_create_dir(config_item_name(®->hr_item), parent); |
1976 | reg->hr_debug_dir = dir; | |
1f285305 | 1977 | |
5e7a3ed9 GKH |
1978 | o2hb_debug_create(O2HB_DEBUG_LIVENODES, dir, &(reg->hr_db_livenodes), |
1979 | sizeof(*(reg->hr_db_livenodes)), | |
1980 | O2HB_DB_TYPE_REGION_LIVENODES, | |
1981 | sizeof(reg->hr_live_node_bitmap), O2NM_MAX_NODES, | |
1982 | reg); | |
1f285305 | 1983 | |
5e7a3ed9 GKH |
1984 | o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER, dir, &(reg->hr_db_regnum), |
1985 | sizeof(*(reg->hr_db_regnum)), | |
1986 | O2HB_DB_TYPE_REGION_NUMBER, 0, O2NM_MAX_NODES, reg); | |
1f285305 | 1987 | |
5e7a3ed9 GKH |
1988 | o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME, dir, |
1989 | &(reg->hr_db_elapsed_time), | |
1990 | sizeof(*(reg->hr_db_elapsed_time)), | |
1991 | O2HB_DB_TYPE_REGION_ELAPSED_TIME, 0, 0, reg); | |
43695d09 | 1992 | |
5e7a3ed9 GKH |
1993 | o2hb_debug_create(O2HB_DEBUG_REGION_PINNED, dir, &(reg->hr_db_pinned), |
1994 | sizeof(*(reg->hr_db_pinned)), | |
1995 | O2HB_DB_TYPE_REGION_PINNED, 0, 0, reg); | |
cb0586bd | 1996 | |
1f285305 SM |
1997 | } |
1998 | ||
f89ab861 JB |
1999 | static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, |
2000 | const char *name) | |
a7f6a5fb MF |
2001 | { |
2002 | struct o2hb_region *reg = NULL; | |
1f285305 | 2003 | int ret; |
a7f6a5fb | 2004 | |
cd861280 | 2005 | reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL); |
f89ab861 | 2006 | if (reg == NULL) |
a6795e9e | 2007 | return ERR_PTR(-ENOMEM); |
a7f6a5fb | 2008 | |
1cf257f5 JS |
2009 | if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) { |
2010 | ret = -ENAMETOOLONG; | |
2011 | goto free; | |
2012 | } | |
b3c85c4c | 2013 | |
a7f6a5fb | 2014 | spin_lock(&o2hb_live_lock); |
536f0741 SM |
2015 | reg->hr_region_num = 0; |
2016 | if (o2hb_global_heartbeat_active()) { | |
2017 | reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap, | |
2018 | O2NM_MAX_REGIONS); | |
2019 | if (reg->hr_region_num >= O2NM_MAX_REGIONS) { | |
2020 | spin_unlock(&o2hb_live_lock); | |
1cf257f5 JS |
2021 | ret = -EFBIG; |
2022 | goto free; | |
536f0741 SM |
2023 | } |
2024 | set_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2025 | } | |
a7f6a5fb MF |
2026 | list_add_tail(®->hr_all_item, &o2hb_all_regions); |
2027 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb | 2028 | |
536f0741 SM |
2029 | config_item_init_type_name(®->hr_item, name, &o2hb_region_type); |
2030 | ||
34069b88 JB |
2031 | /* this is the same way to generate msg key as dlm, for local heartbeat, |
2032 | * name is also the same, so make initial crc value different to avoid | |
2033 | * message key conflict. | |
2034 | */ | |
2035 | reg->hr_key = crc32_le(reg->hr_region_num + O2NM_MAX_REGIONS, | |
2036 | name, strlen(name)); | |
2037 | INIT_LIST_HEAD(®->hr_handler_list); | |
2038 | ret = o2net_register_handler(O2HB_NEGO_TIMEOUT_MSG, reg->hr_key, | |
2039 | sizeof(struct o2hb_nego_msg), | |
2040 | o2hb_nego_timeout_handler, | |
2041 | reg, NULL, ®->hr_handler_list); | |
2042 | if (ret) | |
c57d117f | 2043 | goto remove_item; |
34069b88 | 2044 | |
e76f8237 JB |
2045 | ret = o2net_register_handler(O2HB_NEGO_APPROVE_MSG, reg->hr_key, |
2046 | sizeof(struct o2hb_nego_msg), | |
2047 | o2hb_nego_approve_handler, | |
2048 | reg, NULL, ®->hr_handler_list); | |
2049 | if (ret) | |
2050 | goto unregister_handler; | |
2051 | ||
5e7a3ed9 | 2052 | o2hb_debug_region_init(reg, o2hb_debug_dir); |
1f285305 | 2053 | |
a6795e9e | 2054 | return ®->hr_item; |
34069b88 JB |
2055 | |
2056 | unregister_handler: | |
2057 | o2net_unregister_handler_list(®->hr_handler_list); | |
c57d117f DC |
2058 | remove_item: |
2059 | spin_lock(&o2hb_live_lock); | |
2060 | list_del(®->hr_all_item); | |
2061 | if (o2hb_global_heartbeat_active()) | |
2062 | clear_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2063 | spin_unlock(&o2hb_live_lock); | |
1cf257f5 JS |
2064 | free: |
2065 | kfree(reg); | |
2066 | return ERR_PTR(ret); | |
a7f6a5fb MF |
2067 | } |
2068 | ||
2069 | static void o2hb_heartbeat_group_drop_item(struct config_group *group, | |
2070 | struct config_item *item) | |
2071 | { | |
e6c352db | 2072 | struct task_struct *hb_task; |
a7f6a5fb | 2073 | struct o2hb_region *reg = to_o2hb_region(item); |
58a3158a | 2074 | int quorum_region = 0; |
a7f6a5fb MF |
2075 | |
2076 | /* stop the thread when the user removes the region dir */ | |
e6c352db JB |
2077 | spin_lock(&o2hb_live_lock); |
2078 | hb_task = reg->hr_task; | |
2079 | reg->hr_task = NULL; | |
58a3158a | 2080 | reg->hr_item_dropped = 1; |
e6c352db JB |
2081 | spin_unlock(&o2hb_live_lock); |
2082 | ||
2083 | if (hb_task) | |
2084 | kthread_stop(hb_task); | |
a7f6a5fb | 2085 | |
d2eece37 SM |
2086 | if (o2hb_global_heartbeat_active()) { |
2087 | spin_lock(&o2hb_live_lock); | |
2088 | clear_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2089 | clear_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
2090 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
2091 | quorum_region = 1; | |
2092 | clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
2093 | spin_unlock(&o2hb_live_lock); | |
2094 | printk(KERN_NOTICE "o2hb: Heartbeat %s on region %s (%s)\n", | |
2095 | ((atomic_read(®->hr_steady_iterations) == 0) ? | |
2096 | "stopped" : "start aborted"), config_item_name(item), | |
2097 | reg->hr_dev_name); | |
2098 | } | |
2099 | ||
e6df3a66 JB |
2100 | /* |
2101 | * If we're racing a dev_write(), we need to wake them. They will | |
2102 | * check reg->hr_task | |
2103 | */ | |
2104 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
d2eece37 | 2105 | reg->hr_aborted_start = 1; |
e6df3a66 JB |
2106 | atomic_set(®->hr_steady_iterations, 0); |
2107 | wake_up(&o2hb_steady_queue); | |
2108 | } | |
2109 | ||
a7f6a5fb | 2110 | config_item_put(item); |
58a3158a SM |
2111 | |
2112 | if (!o2hb_global_heartbeat_active() || !quorum_region) | |
2113 | return; | |
2114 | ||
2115 | /* | |
2116 | * If global heartbeat active and there are dependent users, | |
2117 | * pin all regions if quorum region count <= CUT_OFF | |
2118 | */ | |
2119 | spin_lock(&o2hb_live_lock); | |
2120 | ||
2121 | if (!o2hb_dependent_users) | |
2122 | goto unlock; | |
2123 | ||
a8f70de3 | 2124 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2125 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2126 | o2hb_region_pin(NULL); | |
2127 | ||
2128 | unlock: | |
2129 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb MF |
2130 | } |
2131 | ||
33496c3c | 2132 | static ssize_t o2hb_heartbeat_group_dead_threshold_show(struct config_item *item, |
45b99773 | 2133 | char *page) |
a7f6a5fb MF |
2134 | { |
2135 | return sprintf(page, "%u\n", o2hb_dead_threshold); | |
2136 | } | |
2137 | ||
33496c3c | 2138 | static ssize_t o2hb_heartbeat_group_dead_threshold_store(struct config_item *item, |
45b99773 | 2139 | const char *page, size_t count) |
a7f6a5fb MF |
2140 | { |
2141 | unsigned long tmp; | |
2142 | char *p = (char *)page; | |
2143 | ||
2144 | tmp = simple_strtoul(p, &p, 10); | |
2145 | if (!p || (*p && (*p != '\n'))) | |
2146 | return -EINVAL; | |
2147 | ||
2148 | /* this will validate ranges for us. */ | |
2149 | o2hb_dead_threshold_set((unsigned int) tmp); | |
2150 | ||
2151 | return count; | |
2152 | } | |
2153 | ||
45b99773 CH |
2154 | static ssize_t o2hb_heartbeat_group_mode_show(struct config_item *item, |
2155 | char *page) | |
54b5187b SM |
2156 | { |
2157 | return sprintf(page, "%s\n", | |
2158 | o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]); | |
2159 | } | |
2160 | ||
45b99773 CH |
2161 | static ssize_t o2hb_heartbeat_group_mode_store(struct config_item *item, |
2162 | const char *page, size_t count) | |
54b5187b SM |
2163 | { |
2164 | unsigned int i; | |
2165 | int ret; | |
2166 | size_t len; | |
2167 | ||
2168 | len = (page[count - 1] == '\n') ? count - 1 : count; | |
2169 | if (!len) | |
2170 | return -EINVAL; | |
2171 | ||
2172 | for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) { | |
2bd63329 | 2173 | if (strncasecmp(page, o2hb_heartbeat_mode_desc[i], len)) |
54b5187b SM |
2174 | continue; |
2175 | ||
70f651ed | 2176 | ret = o2hb_global_heartbeat_mode_set(i); |
54b5187b | 2177 | if (!ret) |
18c50cb0 | 2178 | printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n", |
54b5187b SM |
2179 | o2hb_heartbeat_mode_desc[i]); |
2180 | return count; | |
2181 | } | |
2182 | ||
2183 | return -EINVAL; | |
2184 | ||
2185 | } | |
2186 | ||
33496c3c | 2187 | CONFIGFS_ATTR(o2hb_heartbeat_group_, dead_threshold); |
45b99773 | 2188 | CONFIGFS_ATTR(o2hb_heartbeat_group_, mode); |
54b5187b | 2189 | |
a7f6a5fb | 2190 | static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { |
33496c3c | 2191 | &o2hb_heartbeat_group_attr_dead_threshold, |
45b99773 | 2192 | &o2hb_heartbeat_group_attr_mode, |
a7f6a5fb MF |
2193 | NULL, |
2194 | }; | |
2195 | ||
a7f6a5fb MF |
2196 | static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { |
2197 | .make_item = o2hb_heartbeat_group_make_item, | |
2198 | .drop_item = o2hb_heartbeat_group_drop_item, | |
2199 | }; | |
2200 | ||
4843afe4 | 2201 | static const struct config_item_type o2hb_heartbeat_group_type = { |
a7f6a5fb | 2202 | .ct_group_ops = &o2hb_heartbeat_group_group_ops, |
a7f6a5fb MF |
2203 | .ct_attrs = o2hb_heartbeat_group_attrs, |
2204 | .ct_owner = THIS_MODULE, | |
2205 | }; | |
2206 | ||
2207 | /* this is just here to avoid touching group in heartbeat.h which the | |
2208 | * entire damn world #includes */ | |
2209 | struct config_group *o2hb_alloc_hb_set(void) | |
2210 | { | |
2211 | struct o2hb_heartbeat_group *hs = NULL; | |
2212 | struct config_group *ret = NULL; | |
2213 | ||
cd861280 | 2214 | hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); |
a7f6a5fb MF |
2215 | if (hs == NULL) |
2216 | goto out; | |
2217 | ||
2218 | config_group_init_type_name(&hs->hs_group, "heartbeat", | |
2219 | &o2hb_heartbeat_group_type); | |
2220 | ||
2221 | ret = &hs->hs_group; | |
2222 | out: | |
2223 | if (ret == NULL) | |
2224 | kfree(hs); | |
2225 | return ret; | |
2226 | } | |
2227 | ||
2228 | void o2hb_free_hb_set(struct config_group *group) | |
2229 | { | |
2230 | struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); | |
2231 | kfree(hs); | |
2232 | } | |
2233 | ||
25985edc | 2234 | /* hb callback registration and issuing */ |
a7f6a5fb MF |
2235 | |
2236 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) | |
2237 | { | |
2238 | if (type == O2HB_NUM_CB) | |
2239 | return ERR_PTR(-EINVAL); | |
2240 | ||
2241 | return &o2hb_callbacks[type]; | |
2242 | } | |
2243 | ||
2244 | void o2hb_setup_callback(struct o2hb_callback_func *hc, | |
2245 | enum o2hb_callback_type type, | |
2246 | o2hb_cb_func *func, | |
2247 | void *data, | |
2248 | int priority) | |
2249 | { | |
2250 | INIT_LIST_HEAD(&hc->hc_item); | |
2251 | hc->hc_func = func; | |
2252 | hc->hc_data = data; | |
2253 | hc->hc_priority = priority; | |
2254 | hc->hc_type = type; | |
2255 | hc->hc_magic = O2HB_CB_MAGIC; | |
2256 | } | |
2257 | EXPORT_SYMBOL_GPL(o2hb_setup_callback); | |
2258 | ||
58a3158a SM |
2259 | /* |
2260 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2261 | * In global heartbeat mode, region_uuid passed is NULL. | |
2262 | * | |
2263 | * In local, we only pin the matching region. In global we pin all the active | |
2264 | * regions. | |
2265 | */ | |
2266 | static int o2hb_region_pin(const char *region_uuid) | |
14829422 | 2267 | { |
58a3158a SM |
2268 | int ret = 0, found = 0; |
2269 | struct o2hb_region *reg; | |
2270 | char *uuid; | |
14829422 JB |
2271 | |
2272 | assert_spin_locked(&o2hb_live_lock); | |
2273 | ||
58a3158a | 2274 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2275 | if (reg->hr_item_dropped) |
2276 | continue; | |
2277 | ||
58a3158a SM |
2278 | uuid = config_item_name(®->hr_item); |
2279 | ||
2280 | /* local heartbeat */ | |
2281 | if (region_uuid) { | |
2282 | if (strcmp(region_uuid, uuid)) | |
2283 | continue; | |
2284 | found = 1; | |
14829422 | 2285 | } |
58a3158a SM |
2286 | |
2287 | if (reg->hr_item_pinned || reg->hr_item_dropped) | |
2288 | goto skip_pin; | |
2289 | ||
2290 | /* Ignore ENOENT only for local hb (userdlm domain) */ | |
2291 | ret = o2nm_depend_item(®->hr_item); | |
2292 | if (!ret) { | |
2293 | mlog(ML_CLUSTER, "Pin region %s\n", uuid); | |
2294 | reg->hr_item_pinned = 1; | |
2295 | } else { | |
2296 | if (ret == -ENOENT && found) | |
2297 | ret = 0; | |
2298 | else { | |
2299 | mlog(ML_ERROR, "Pin region %s fails with %d\n", | |
2300 | uuid, ret); | |
2301 | break; | |
2302 | } | |
14829422 | 2303 | } |
58a3158a SM |
2304 | skip_pin: |
2305 | if (found) | |
2306 | break; | |
14829422 JB |
2307 | } |
2308 | ||
58a3158a | 2309 | return ret; |
14829422 JB |
2310 | } |
2311 | ||
58a3158a SM |
2312 | /* |
2313 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2314 | * In global heartbeat mode, region_uuid passed is NULL. | |
2315 | * | |
2316 | * In local, we only unpin the matching region. In global we unpin all the | |
2317 | * active regions. | |
2318 | */ | |
2319 | static void o2hb_region_unpin(const char *region_uuid) | |
14829422 | 2320 | { |
14829422 | 2321 | struct o2hb_region *reg; |
58a3158a SM |
2322 | char *uuid; |
2323 | int found = 0; | |
14829422 | 2324 | |
58a3158a | 2325 | assert_spin_locked(&o2hb_live_lock); |
14829422 | 2326 | |
58a3158a | 2327 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2328 | if (reg->hr_item_dropped) |
2329 | continue; | |
2330 | ||
58a3158a SM |
2331 | uuid = config_item_name(®->hr_item); |
2332 | if (region_uuid) { | |
2333 | if (strcmp(region_uuid, uuid)) | |
2334 | continue; | |
2335 | found = 1; | |
2336 | } | |
14829422 | 2337 | |
58a3158a SM |
2338 | if (reg->hr_item_pinned) { |
2339 | mlog(ML_CLUSTER, "Unpin region %s\n", uuid); | |
2340 | o2nm_undepend_item(®->hr_item); | |
2341 | reg->hr_item_pinned = 0; | |
2342 | } | |
2343 | if (found) | |
2344 | break; | |
2345 | } | |
2346 | } | |
16c6a4f2 | 2347 | |
58a3158a SM |
2348 | static int o2hb_region_inc_user(const char *region_uuid) |
2349 | { | |
2350 | int ret = 0; | |
14829422 | 2351 | |
58a3158a | 2352 | spin_lock(&o2hb_live_lock); |
16c6a4f2 | 2353 | |
58a3158a SM |
2354 | /* local heartbeat */ |
2355 | if (!o2hb_global_heartbeat_active()) { | |
2356 | ret = o2hb_region_pin(region_uuid); | |
2357 | goto unlock; | |
2358 | } | |
2359 | ||
2360 | /* | |
2361 | * if global heartbeat active and this is the first dependent user, | |
2362 | * pin all regions if quorum region count <= CUT_OFF | |
2363 | */ | |
2364 | o2hb_dependent_users++; | |
2365 | if (o2hb_dependent_users > 1) | |
2366 | goto unlock; | |
2367 | ||
a8f70de3 | 2368 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2369 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2370 | ret = o2hb_region_pin(NULL); | |
2371 | ||
2372 | unlock: | |
2373 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2374 | return ret; |
2375 | } | |
2376 | ||
480bd564 | 2377 | static void o2hb_region_dec_user(const char *region_uuid) |
14829422 | 2378 | { |
14829422 JB |
2379 | spin_lock(&o2hb_live_lock); |
2380 | ||
58a3158a SM |
2381 | /* local heartbeat */ |
2382 | if (!o2hb_global_heartbeat_active()) { | |
2383 | o2hb_region_unpin(region_uuid); | |
2384 | goto unlock; | |
2385 | } | |
14829422 | 2386 | |
58a3158a SM |
2387 | /* |
2388 | * if global heartbeat active and there are no dependent users, | |
2389 | * unpin all quorum regions | |
2390 | */ | |
2391 | o2hb_dependent_users--; | |
2392 | if (!o2hb_dependent_users) | |
2393 | o2hb_region_unpin(NULL); | |
14829422 | 2394 | |
58a3158a SM |
2395 | unlock: |
2396 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2397 | } |
2398 | ||
2399 | int o2hb_register_callback(const char *region_uuid, | |
2400 | struct o2hb_callback_func *hc) | |
a7f6a5fb | 2401 | { |
df53cd3b | 2402 | struct o2hb_callback_func *f; |
a7f6a5fb MF |
2403 | struct o2hb_callback *hbcall; |
2404 | int ret; | |
2405 | ||
2406 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2407 | BUG_ON(!list_empty(&hc->hc_item)); | |
2408 | ||
2409 | hbcall = hbcall_from_type(hc->hc_type); | |
2410 | if (IS_ERR(hbcall)) { | |
2411 | ret = PTR_ERR(hbcall); | |
2412 | goto out; | |
2413 | } | |
2414 | ||
14829422 | 2415 | if (region_uuid) { |
58a3158a SM |
2416 | ret = o2hb_region_inc_user(region_uuid); |
2417 | if (ret) { | |
2418 | mlog_errno(ret); | |
14829422 | 2419 | goto out; |
58a3158a | 2420 | } |
14829422 JB |
2421 | } |
2422 | ||
a7f6a5fb MF |
2423 | down_write(&o2hb_callback_sem); |
2424 | ||
df53cd3b DF |
2425 | list_for_each_entry(f, &hbcall->list, hc_item) { |
2426 | if (hc->hc_priority < f->hc_priority) { | |
2427 | list_add_tail(&hc->hc_item, &f->hc_item); | |
a7f6a5fb MF |
2428 | break; |
2429 | } | |
2430 | } | |
2431 | if (list_empty(&hc->hc_item)) | |
2432 | list_add_tail(&hc->hc_item, &hbcall->list); | |
2433 | ||
2434 | up_write(&o2hb_callback_sem); | |
2435 | ret = 0; | |
2436 | out: | |
58a3158a | 2437 | mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2438 | ret, __builtin_return_address(0), hc); |
2439 | return ret; | |
2440 | } | |
2441 | EXPORT_SYMBOL_GPL(o2hb_register_callback); | |
2442 | ||
14829422 JB |
2443 | void o2hb_unregister_callback(const char *region_uuid, |
2444 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
2445 | { |
2446 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2447 | ||
58a3158a | 2448 | mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2449 | __builtin_return_address(0), hc); |
2450 | ||
14829422 | 2451 | /* XXX Can this happen _with_ a region reference? */ |
a7f6a5fb | 2452 | if (list_empty(&hc->hc_item)) |
c24f72cc | 2453 | return; |
a7f6a5fb | 2454 | |
14829422 | 2455 | if (region_uuid) |
58a3158a | 2456 | o2hb_region_dec_user(region_uuid); |
14829422 | 2457 | |
a7f6a5fb MF |
2458 | down_write(&o2hb_callback_sem); |
2459 | ||
2460 | list_del_init(&hc->hc_item); | |
2461 | ||
2462 | up_write(&o2hb_callback_sem); | |
a7f6a5fb MF |
2463 | } |
2464 | EXPORT_SYMBOL_GPL(o2hb_unregister_callback); | |
2465 | ||
70e82a12 JQ |
2466 | int o2hb_check_node_heartbeating_no_sem(u8 node_num) |
2467 | { | |
2468 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
70e82a12 | 2469 | |
4d548f61 | 2470 | spin_lock(&o2hb_live_lock); |
70e82a12 | 2471 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); |
4d548f61 | 2472 | spin_unlock(&o2hb_live_lock); |
70e82a12 JQ |
2473 | if (!test_bit(node_num, testing_map)) { |
2474 | mlog(ML_HEARTBEAT, | |
2475 | "node (%u) does not have heartbeating enabled.\n", | |
2476 | node_num); | |
2477 | return 0; | |
2478 | } | |
2479 | ||
2480 | return 1; | |
2481 | } | |
2482 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_no_sem); | |
2483 | ||
a7f6a5fb MF |
2484 | int o2hb_check_node_heartbeating_from_callback(u8 node_num) |
2485 | { | |
2486 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2487 | ||
2488 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); | |
2489 | if (!test_bit(node_num, testing_map)) { | |
2490 | mlog(ML_HEARTBEAT, | |
2491 | "node (%u) does not have heartbeating enabled.\n", | |
2492 | node_num); | |
2493 | return 0; | |
2494 | } | |
2495 | ||
2496 | return 1; | |
2497 | } | |
2498 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); | |
2499 | ||
a7f6a5fb MF |
2500 | /* |
2501 | * this is just a hack until we get the plumbing which flips file systems | |
2502 | * read only and drops the hb ref instead of killing the node dead. | |
2503 | */ | |
2504 | void o2hb_stop_all_regions(void) | |
2505 | { | |
2506 | struct o2hb_region *reg; | |
2507 | ||
2508 | mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); | |
2509 | ||
2510 | spin_lock(&o2hb_live_lock); | |
2511 | ||
2512 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) | |
2513 | reg->hr_unclean_stop = 1; | |
2514 | ||
2515 | spin_unlock(&o2hb_live_lock); | |
2516 | } | |
2517 | EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); | |
b3c85c4c SM |
2518 | |
2519 | int o2hb_get_all_regions(char *region_uuids, u8 max_regions) | |
2520 | { | |
2521 | struct o2hb_region *reg; | |
2522 | int numregs = 0; | |
2523 | char *p; | |
2524 | ||
2525 | spin_lock(&o2hb_live_lock); | |
2526 | ||
2527 | p = region_uuids; | |
2528 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { | |
4a184b4f X |
2529 | if (reg->hr_item_dropped) |
2530 | continue; | |
2531 | ||
b3c85c4c SM |
2532 | mlog(0, "Region: %s\n", config_item_name(®->hr_item)); |
2533 | if (numregs < max_regions) { | |
2534 | memcpy(p, config_item_name(®->hr_item), | |
2535 | O2HB_MAX_REGION_NAME_LEN); | |
2536 | p += O2HB_MAX_REGION_NAME_LEN; | |
2537 | } | |
2538 | numregs++; | |
2539 | } | |
2540 | ||
2541 | spin_unlock(&o2hb_live_lock); | |
2542 | ||
2543 | return numregs; | |
2544 | } | |
2545 | EXPORT_SYMBOL_GPL(o2hb_get_all_regions); | |
2546 | ||
2547 | int o2hb_global_heartbeat_active(void) | |
2548 | { | |
4d94aa1b | 2549 | return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL); |
b3c85c4c SM |
2550 | } |
2551 | EXPORT_SYMBOL(o2hb_global_heartbeat_active); |