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328970de | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
a7f6a5fb MF |
2 | /* -*- mode: c; c-basic-offset: 8; -*- |
3 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
4 | * | |
5 | * Copyright (C) 2004, 2005 Oracle. All rights reserved. | |
a7f6a5fb MF |
6 | */ |
7 | ||
8 | #include <linux/kernel.h> | |
9 | #include <linux/sched.h> | |
10 | #include <linux/jiffies.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/fs.h> | |
13 | #include <linux/bio.h> | |
14 | #include <linux/blkdev.h> | |
15 | #include <linux/delay.h> | |
16 | #include <linux/file.h> | |
17 | #include <linux/kthread.h> | |
18 | #include <linux/configfs.h> | |
19 | #include <linux/random.h> | |
20 | #include <linux/crc32.h> | |
21 | #include <linux/time.h> | |
87d3d3f3 | 22 | #include <linux/debugfs.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
a8f70de3 | 24 | #include <linux/bitmap.h> |
40476b82 | 25 | #include <linux/ktime.h> |
a7f6a5fb MF |
26 | #include "heartbeat.h" |
27 | #include "tcp.h" | |
28 | #include "nodemanager.h" | |
29 | #include "quorum.h" | |
30 | ||
31 | #include "masklog.h" | |
32 | ||
33 | ||
34 | /* | |
35 | * The first heartbeat pass had one global thread that would serialize all hb | |
36 | * callback calls. This global serializing sem should only be removed once | |
37 | * we've made sure that all callees can deal with being called concurrently | |
38 | * from multiple hb region threads. | |
39 | */ | |
40 | static DECLARE_RWSEM(o2hb_callback_sem); | |
41 | ||
42 | /* | |
43 | * multiple hb threads are watching multiple regions. A node is live | |
44 | * whenever any of the threads sees activity from the node in its region. | |
45 | */ | |
34af946a | 46 | static DEFINE_SPINLOCK(o2hb_live_lock); |
a7f6a5fb MF |
47 | static struct list_head o2hb_live_slots[O2NM_MAX_NODES]; |
48 | static unsigned long o2hb_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
49 | static LIST_HEAD(o2hb_node_events); | |
50 | static DECLARE_WAIT_QUEUE_HEAD(o2hb_steady_queue); | |
51 | ||
536f0741 SM |
52 | /* |
53 | * In global heartbeat, we maintain a series of region bitmaps. | |
54 | * - o2hb_region_bitmap allows us to limit the region number to max region. | |
e7d656ba | 55 | * - o2hb_live_region_bitmap tracks live regions (seen steady iterations). |
43182d2a SM |
56 | * - o2hb_quorum_region_bitmap tracks live regions that have seen all nodes |
57 | * heartbeat on it. | |
b1c5ebfb | 58 | * - o2hb_failed_region_bitmap tracks the regions that have seen io timeouts. |
536f0741 SM |
59 | */ |
60 | static unsigned long o2hb_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; | |
e7d656ba | 61 | static unsigned long o2hb_live_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
43182d2a | 62 | static unsigned long o2hb_quorum_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
b1c5ebfb | 63 | static unsigned long o2hb_failed_region_bitmap[BITS_TO_LONGS(O2NM_MAX_REGIONS)]; |
536f0741 | 64 | |
8ca8b0bb | 65 | #define O2HB_DB_TYPE_LIVENODES 0 |
a6de0136 SM |
66 | #define O2HB_DB_TYPE_LIVEREGIONS 1 |
67 | #define O2HB_DB_TYPE_QUORUMREGIONS 2 | |
68 | #define O2HB_DB_TYPE_FAILEDREGIONS 3 | |
1f285305 SM |
69 | #define O2HB_DB_TYPE_REGION_LIVENODES 4 |
70 | #define O2HB_DB_TYPE_REGION_NUMBER 5 | |
43695d09 | 71 | #define O2HB_DB_TYPE_REGION_ELAPSED_TIME 6 |
cb0586bd | 72 | #define O2HB_DB_TYPE_REGION_PINNED 7 |
8ca8b0bb SM |
73 | struct o2hb_debug_buf { |
74 | int db_type; | |
75 | int db_size; | |
76 | int db_len; | |
77 | void *db_data; | |
78 | }; | |
79 | ||
80 | static struct o2hb_debug_buf *o2hb_db_livenodes; | |
a6de0136 SM |
81 | static struct o2hb_debug_buf *o2hb_db_liveregions; |
82 | static struct o2hb_debug_buf *o2hb_db_quorumregions; | |
83 | static struct o2hb_debug_buf *o2hb_db_failedregions; | |
8ca8b0bb | 84 | |
87d3d3f3 SM |
85 | #define O2HB_DEBUG_DIR "o2hb" |
86 | #define O2HB_DEBUG_LIVENODES "livenodes" | |
a6de0136 SM |
87 | #define O2HB_DEBUG_LIVEREGIONS "live_regions" |
88 | #define O2HB_DEBUG_QUORUMREGIONS "quorum_regions" | |
89 | #define O2HB_DEBUG_FAILEDREGIONS "failed_regions" | |
1f285305 | 90 | #define O2HB_DEBUG_REGION_NUMBER "num" |
43695d09 | 91 | #define O2HB_DEBUG_REGION_ELAPSED_TIME "elapsed_time_in_ms" |
cb0586bd | 92 | #define O2HB_DEBUG_REGION_PINNED "pinned" |
8ca8b0bb | 93 | |
87d3d3f3 | 94 | static struct dentry *o2hb_debug_dir; |
87d3d3f3 | 95 | |
a7f6a5fb MF |
96 | static LIST_HEAD(o2hb_all_regions); |
97 | ||
98 | static struct o2hb_callback { | |
99 | struct list_head list; | |
100 | } o2hb_callbacks[O2HB_NUM_CB]; | |
101 | ||
102 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type); | |
103 | ||
54b5187b SM |
104 | enum o2hb_heartbeat_modes { |
105 | O2HB_HEARTBEAT_LOCAL = 0, | |
106 | O2HB_HEARTBEAT_GLOBAL, | |
107 | O2HB_HEARTBEAT_NUM_MODES, | |
108 | }; | |
109 | ||
480bd564 CIK |
110 | static const char *o2hb_heartbeat_mode_desc[O2HB_HEARTBEAT_NUM_MODES] = { |
111 | "local", /* O2HB_HEARTBEAT_LOCAL */ | |
112 | "global", /* O2HB_HEARTBEAT_GLOBAL */ | |
54b5187b SM |
113 | }; |
114 | ||
a7f6a5fb | 115 | unsigned int o2hb_dead_threshold = O2HB_DEFAULT_DEAD_THRESHOLD; |
480bd564 | 116 | static unsigned int o2hb_heartbeat_mode = O2HB_HEARTBEAT_LOCAL; |
a7f6a5fb | 117 | |
58a3158a SM |
118 | /* |
119 | * o2hb_dependent_users tracks the number of registered callbacks that depend | |
120 | * on heartbeat. o2net and o2dlm are two entities that register this callback. | |
121 | * However only o2dlm depends on the heartbeat. It does not want the heartbeat | |
122 | * to stop while a dlm domain is still active. | |
123 | */ | |
480bd564 | 124 | static unsigned int o2hb_dependent_users; |
58a3158a SM |
125 | |
126 | /* | |
127 | * In global heartbeat mode, all regions are pinned if there are one or more | |
128 | * dependent users and the quorum region count is <= O2HB_PIN_CUT_OFF. All | |
129 | * regions are unpinned if the region count exceeds the cut off or the number | |
130 | * of dependent users falls to zero. | |
131 | */ | |
132 | #define O2HB_PIN_CUT_OFF 3 | |
133 | ||
134 | /* | |
135 | * In local heartbeat mode, we assume the dlm domain name to be the same as | |
136 | * region uuid. This is true for domains created for the file system but not | |
137 | * necessarily true for userdlm domains. This is a known limitation. | |
138 | * | |
139 | * In global heartbeat mode, we pin/unpin all o2hb regions. This solution | |
140 | * works for both file system and userdlm domains. | |
141 | */ | |
142 | static int o2hb_region_pin(const char *region_uuid); | |
143 | static void o2hb_region_unpin(const char *region_uuid); | |
144 | ||
2bd63216 | 145 | /* Only sets a new threshold if there are no active regions. |
a7f6a5fb MF |
146 | * |
147 | * No locking or otherwise interesting code is required for reading | |
148 | * o2hb_dead_threshold as it can't change once regions are active and | |
149 | * it's not interesting to anyone until then anyway. */ | |
150 | static void o2hb_dead_threshold_set(unsigned int threshold) | |
151 | { | |
152 | if (threshold > O2HB_MIN_DEAD_THRESHOLD) { | |
153 | spin_lock(&o2hb_live_lock); | |
154 | if (list_empty(&o2hb_all_regions)) | |
155 | o2hb_dead_threshold = threshold; | |
156 | spin_unlock(&o2hb_live_lock); | |
157 | } | |
158 | } | |
159 | ||
70f651ed | 160 | static int o2hb_global_heartbeat_mode_set(unsigned int hb_mode) |
54b5187b SM |
161 | { |
162 | int ret = -1; | |
163 | ||
164 | if (hb_mode < O2HB_HEARTBEAT_NUM_MODES) { | |
165 | spin_lock(&o2hb_live_lock); | |
166 | if (list_empty(&o2hb_all_regions)) { | |
167 | o2hb_heartbeat_mode = hb_mode; | |
168 | ret = 0; | |
169 | } | |
170 | spin_unlock(&o2hb_live_lock); | |
171 | } | |
172 | ||
173 | return ret; | |
174 | } | |
175 | ||
a7f6a5fb MF |
176 | struct o2hb_node_event { |
177 | struct list_head hn_item; | |
178 | enum o2hb_callback_type hn_event_type; | |
179 | struct o2nm_node *hn_node; | |
180 | int hn_node_num; | |
181 | }; | |
182 | ||
183 | struct o2hb_disk_slot { | |
184 | struct o2hb_disk_heartbeat_block *ds_raw_block; | |
185 | u8 ds_node_num; | |
186 | u64 ds_last_time; | |
187 | u64 ds_last_generation; | |
188 | u16 ds_equal_samples; | |
189 | u16 ds_changed_samples; | |
190 | struct list_head ds_live_item; | |
191 | }; | |
192 | ||
193 | /* each thread owns a region.. when we're asked to tear down the region | |
194 | * we ask the thread to stop, who cleans up the region */ | |
195 | struct o2hb_region { | |
196 | struct config_item hr_item; | |
197 | ||
198 | struct list_head hr_all_item; | |
58a3158a | 199 | unsigned hr_unclean_stop:1, |
d2eece37 | 200 | hr_aborted_start:1, |
58a3158a | 201 | hr_item_pinned:1, |
0986fe9b JQ |
202 | hr_item_dropped:1, |
203 | hr_node_deleted:1; | |
a7f6a5fb MF |
204 | |
205 | /* protected by the hr_callback_sem */ | |
206 | struct task_struct *hr_task; | |
207 | ||
208 | unsigned int hr_blocks; | |
209 | unsigned long long hr_start_block; | |
210 | ||
211 | unsigned int hr_block_bits; | |
212 | unsigned int hr_block_bytes; | |
213 | ||
214 | unsigned int hr_slots_per_page; | |
215 | unsigned int hr_num_pages; | |
216 | ||
217 | struct page **hr_slot_data; | |
218 | struct block_device *hr_bdev; | |
219 | struct o2hb_disk_slot *hr_slots; | |
220 | ||
823a637a SM |
221 | /* live node map of this region */ |
222 | unsigned long hr_live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
536f0741 | 223 | unsigned int hr_region_num; |
823a637a | 224 | |
1f285305 | 225 | struct dentry *hr_debug_dir; |
1f285305 SM |
226 | struct o2hb_debug_buf *hr_db_livenodes; |
227 | struct o2hb_debug_buf *hr_db_regnum; | |
43695d09 | 228 | struct o2hb_debug_buf *hr_db_elapsed_time; |
cb0586bd | 229 | struct o2hb_debug_buf *hr_db_pinned; |
1f285305 | 230 | |
a7f6a5fb MF |
231 | /* let the person setting up hb wait for it to return until it |
232 | * has reached a 'steady' state. This will be fixed when we have | |
233 | * a more complete api that doesn't lead to this sort of fragility. */ | |
234 | atomic_t hr_steady_iterations; | |
235 | ||
d2eece37 SM |
236 | /* terminate o2hb thread if it does not reach steady state |
237 | * (hr_steady_iterations == 0) within hr_unsteady_iterations */ | |
238 | atomic_t hr_unsteady_iterations; | |
239 | ||
a7f6a5fb MF |
240 | char hr_dev_name[BDEVNAME_SIZE]; |
241 | ||
242 | unsigned int hr_timeout_ms; | |
243 | ||
244 | /* randomized as the region goes up and down so that a node | |
245 | * recognizes a node going up and down in one iteration */ | |
246 | u64 hr_generation; | |
247 | ||
c4028958 | 248 | struct delayed_work hr_write_timeout_work; |
a7f6a5fb MF |
249 | unsigned long hr_last_timeout_start; |
250 | ||
e0cbb798 JB |
251 | /* negotiate timer, used to negotiate extending hb timeout. */ |
252 | struct delayed_work hr_nego_timeout_work; | |
253 | unsigned long hr_nego_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
254 | ||
a7f6a5fb MF |
255 | /* Used during o2hb_check_slot to hold a copy of the block |
256 | * being checked because we temporarily have to zero out the | |
257 | * crc field. */ | |
258 | struct o2hb_disk_heartbeat_block *hr_tmp_block; | |
34069b88 JB |
259 | |
260 | /* Message key for negotiate timeout message. */ | |
261 | unsigned int hr_key; | |
262 | struct list_head hr_handler_list; | |
88dbe98d JB |
263 | |
264 | /* last hb status, 0 for success, other value for error. */ | |
265 | int hr_last_hb_status; | |
a7f6a5fb MF |
266 | }; |
267 | ||
268 | struct o2hb_bio_wait_ctxt { | |
269 | atomic_t wc_num_reqs; | |
270 | struct completion wc_io_complete; | |
a9e2ae39 | 271 | int wc_error; |
a7f6a5fb MF |
272 | }; |
273 | ||
1bd12902 JB |
274 | #define O2HB_NEGO_TIMEOUT_MS (O2HB_MAX_WRITE_TIMEOUT_MS/2) |
275 | ||
34069b88 JB |
276 | enum { |
277 | O2HB_NEGO_TIMEOUT_MSG = 1, | |
e76f8237 | 278 | O2HB_NEGO_APPROVE_MSG = 2, |
34069b88 JB |
279 | }; |
280 | ||
281 | struct o2hb_nego_msg { | |
282 | u8 node_num; | |
283 | }; | |
284 | ||
c4028958 | 285 | static void o2hb_write_timeout(struct work_struct *work) |
a7f6a5fb | 286 | { |
b1c5ebfb | 287 | int failed, quorum; |
c4028958 DH |
288 | struct o2hb_region *reg = |
289 | container_of(work, struct o2hb_region, | |
290 | hr_write_timeout_work.work); | |
a7f6a5fb MF |
291 | |
292 | mlog(ML_ERROR, "Heartbeat write timeout to device %s after %u " | |
293 | "milliseconds\n", reg->hr_dev_name, | |
2bd63216 | 294 | jiffies_to_msecs(jiffies - reg->hr_last_timeout_start)); |
b1c5ebfb SM |
295 | |
296 | if (o2hb_global_heartbeat_active()) { | |
4d548f61 | 297 | spin_lock(&o2hb_live_lock); |
b1c5ebfb SM |
298 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) |
299 | set_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
a8f70de3 | 300 | failed = bitmap_weight(o2hb_failed_region_bitmap, |
b1c5ebfb | 301 | O2NM_MAX_REGIONS); |
a8f70de3 | 302 | quorum = bitmap_weight(o2hb_quorum_region_bitmap, |
b1c5ebfb | 303 | O2NM_MAX_REGIONS); |
4d548f61 | 304 | spin_unlock(&o2hb_live_lock); |
b1c5ebfb SM |
305 | |
306 | mlog(ML_HEARTBEAT, "Number of regions %d, failed regions %d\n", | |
307 | quorum, failed); | |
308 | ||
309 | /* | |
310 | * Fence if the number of failed regions >= half the number | |
311 | * of quorum regions | |
312 | */ | |
313 | if ((failed << 1) < quorum) | |
314 | return; | |
315 | } | |
316 | ||
a7f6a5fb MF |
317 | o2quo_disk_timeout(); |
318 | } | |
319 | ||
e0cbb798 | 320 | static void o2hb_arm_timeout(struct o2hb_region *reg) |
a7f6a5fb | 321 | { |
d2eece37 SM |
322 | /* Arm writeout only after thread reaches steady state */ |
323 | if (atomic_read(®->hr_steady_iterations) != 0) | |
324 | return; | |
325 | ||
b31d308d TM |
326 | mlog(ML_HEARTBEAT, "Queue write timeout for %u ms\n", |
327 | O2HB_MAX_WRITE_TIMEOUT_MS); | |
a7f6a5fb | 328 | |
b1c5ebfb SM |
329 | if (o2hb_global_heartbeat_active()) { |
330 | spin_lock(&o2hb_live_lock); | |
331 | clear_bit(reg->hr_region_num, o2hb_failed_region_bitmap); | |
332 | spin_unlock(&o2hb_live_lock); | |
333 | } | |
a7f6a5fb | 334 | cancel_delayed_work(®->hr_write_timeout_work); |
a7f6a5fb MF |
335 | schedule_delayed_work(®->hr_write_timeout_work, |
336 | msecs_to_jiffies(O2HB_MAX_WRITE_TIMEOUT_MS)); | |
e0cbb798 JB |
337 | |
338 | cancel_delayed_work(®->hr_nego_timeout_work); | |
339 | /* negotiate timeout must be less than write timeout. */ | |
340 | schedule_delayed_work(®->hr_nego_timeout_work, | |
1bd12902 | 341 | msecs_to_jiffies(O2HB_NEGO_TIMEOUT_MS)); |
e0cbb798 | 342 | memset(reg->hr_nego_node_bitmap, 0, sizeof(reg->hr_nego_node_bitmap)); |
a7f6a5fb MF |
343 | } |
344 | ||
e0cbb798 | 345 | static void o2hb_disarm_timeout(struct o2hb_region *reg) |
a7f6a5fb | 346 | { |
9b00a818 | 347 | cancel_delayed_work_sync(®->hr_write_timeout_work); |
e0cbb798 JB |
348 | cancel_delayed_work_sync(®->hr_nego_timeout_work); |
349 | } | |
350 | ||
34069b88 JB |
351 | static int o2hb_send_nego_msg(int key, int type, u8 target) |
352 | { | |
353 | struct o2hb_nego_msg msg; | |
354 | int status, ret; | |
355 | ||
356 | msg.node_num = o2nm_this_node(); | |
357 | again: | |
358 | ret = o2net_send_message(type, key, &msg, sizeof(msg), | |
359 | target, &status); | |
360 | ||
361 | if (ret == -EAGAIN || ret == -ENOMEM) { | |
362 | msleep(100); | |
363 | goto again; | |
364 | } | |
365 | ||
366 | return ret; | |
367 | } | |
368 | ||
e0cbb798 JB |
369 | static void o2hb_nego_timeout(struct work_struct *work) |
370 | { | |
371 | unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
1bd12902 | 372 | int master_node, i, ret; |
e0cbb798 JB |
373 | struct o2hb_region *reg; |
374 | ||
375 | reg = container_of(work, struct o2hb_region, hr_nego_timeout_work.work); | |
88dbe98d JB |
376 | /* don't negotiate timeout if last hb failed since it is very |
377 | * possible io failed. Should let write timeout fence self. | |
378 | */ | |
379 | if (reg->hr_last_hb_status) | |
380 | return; | |
381 | ||
e0cbb798 JB |
382 | o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap)); |
383 | /* lowest node as master node to make negotiate decision. */ | |
384 | master_node = find_next_bit(live_node_bitmap, O2NM_MAX_NODES, 0); | |
385 | ||
386 | if (master_node == o2nm_this_node()) { | |
1bd12902 JB |
387 | if (!test_bit(master_node, reg->hr_nego_node_bitmap)) { |
388 | printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%s).\n", | |
389 | o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000, | |
390 | config_item_name(®->hr_item), reg->hr_dev_name); | |
391 | set_bit(master_node, reg->hr_nego_node_bitmap); | |
392 | } | |
e0cbb798 JB |
393 | if (memcmp(reg->hr_nego_node_bitmap, live_node_bitmap, |
394 | sizeof(reg->hr_nego_node_bitmap))) { | |
395 | /* check negotiate bitmap every second to do timeout | |
396 | * approve decision. | |
397 | */ | |
398 | schedule_delayed_work(®->hr_nego_timeout_work, | |
399 | msecs_to_jiffies(1000)); | |
400 | ||
401 | return; | |
402 | } | |
403 | ||
1bd12902 JB |
404 | printk(KERN_NOTICE "o2hb: all nodes hb write hung, maybe region %s (%s) is down.\n", |
405 | config_item_name(®->hr_item), reg->hr_dev_name); | |
e0cbb798 | 406 | /* approve negotiate timeout request. */ |
e76f8237 JB |
407 | o2hb_arm_timeout(reg); |
408 | ||
409 | i = -1; | |
410 | while ((i = find_next_bit(live_node_bitmap, | |
411 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
412 | if (i == master_node) | |
413 | continue; | |
414 | ||
1bd12902 JB |
415 | mlog(ML_HEARTBEAT, "send NEGO_APPROVE msg to node %d\n", i); |
416 | ret = o2hb_send_nego_msg(reg->hr_key, | |
e76f8237 | 417 | O2HB_NEGO_APPROVE_MSG, i); |
1bd12902 JB |
418 | if (ret) |
419 | mlog(ML_ERROR, "send NEGO_APPROVE msg to node %d fail %d\n", | |
420 | i, ret); | |
e76f8237 | 421 | } |
e0cbb798 JB |
422 | } else { |
423 | /* negotiate timeout with master node. */ | |
1bd12902 JB |
424 | printk(KERN_NOTICE "o2hb: node %d hb write hung for %ds on region %s (%s), negotiate timeout with node %d.\n", |
425 | o2nm_this_node(), O2HB_NEGO_TIMEOUT_MS/1000, config_item_name(®->hr_item), | |
426 | reg->hr_dev_name, master_node); | |
427 | ret = o2hb_send_nego_msg(reg->hr_key, O2HB_NEGO_TIMEOUT_MSG, | |
428 | master_node); | |
429 | if (ret) | |
430 | mlog(ML_ERROR, "send NEGO_TIMEOUT msg to node %d fail %d\n", | |
431 | master_node, ret); | |
e0cbb798 | 432 | } |
34069b88 JB |
433 | } |
434 | ||
435 | static int o2hb_nego_timeout_handler(struct o2net_msg *msg, u32 len, void *data, | |
436 | void **ret_data) | |
437 | { | |
438 | struct o2hb_region *reg = data; | |
439 | struct o2hb_nego_msg *nego_msg; | |
e0cbb798 | 440 | |
34069b88 | 441 | nego_msg = (struct o2hb_nego_msg *)msg->buf; |
1bd12902 JB |
442 | printk(KERN_NOTICE "o2hb: receive negotiate timeout message from node %d on region %s (%s).\n", |
443 | nego_msg->node_num, config_item_name(®->hr_item), reg->hr_dev_name); | |
34069b88 JB |
444 | if (nego_msg->node_num < O2NM_MAX_NODES) |
445 | set_bit(nego_msg->node_num, reg->hr_nego_node_bitmap); | |
446 | else | |
447 | mlog(ML_ERROR, "got nego timeout message from bad node.\n"); | |
448 | ||
449 | return 0; | |
a7f6a5fb MF |
450 | } |
451 | ||
e76f8237 JB |
452 | static int o2hb_nego_approve_handler(struct o2net_msg *msg, u32 len, void *data, |
453 | void **ret_data) | |
454 | { | |
1bd12902 JB |
455 | struct o2hb_region *reg = data; |
456 | ||
457 | printk(KERN_NOTICE "o2hb: negotiate timeout approved by master node on region %s (%s).\n", | |
458 | config_item_name(®->hr_item), reg->hr_dev_name); | |
459 | o2hb_arm_timeout(reg); | |
e76f8237 JB |
460 | return 0; |
461 | } | |
462 | ||
b559292e | 463 | static inline void o2hb_bio_wait_init(struct o2hb_bio_wait_ctxt *wc) |
a7f6a5fb | 464 | { |
b559292e | 465 | atomic_set(&wc->wc_num_reqs, 1); |
a7f6a5fb | 466 | init_completion(&wc->wc_io_complete); |
a9e2ae39 | 467 | wc->wc_error = 0; |
a7f6a5fb MF |
468 | } |
469 | ||
470 | /* Used in error paths too */ | |
471 | static inline void o2hb_bio_wait_dec(struct o2hb_bio_wait_ctxt *wc, | |
472 | unsigned int num) | |
473 | { | |
474 | /* sadly atomic_sub_and_test() isn't available on all platforms. The | |
475 | * good news is that the fast path only completes one at a time */ | |
476 | while(num--) { | |
477 | if (atomic_dec_and_test(&wc->wc_num_reqs)) { | |
478 | BUG_ON(num > 0); | |
479 | complete(&wc->wc_io_complete); | |
480 | } | |
481 | } | |
482 | } | |
483 | ||
964f14a0 | 484 | static void o2hb_wait_on_io(struct o2hb_bio_wait_ctxt *wc) |
a7f6a5fb | 485 | { |
b559292e | 486 | o2hb_bio_wait_dec(wc, 1); |
a7f6a5fb MF |
487 | wait_for_completion(&wc->wc_io_complete); |
488 | } | |
489 | ||
4246a0b6 | 490 | static void o2hb_bio_end_io(struct bio *bio) |
a7f6a5fb MF |
491 | { |
492 | struct o2hb_bio_wait_ctxt *wc = bio->bi_private; | |
493 | ||
4e4cbee9 CH |
494 | if (bio->bi_status) { |
495 | mlog(ML_ERROR, "IO Error %d\n", bio->bi_status); | |
496 | wc->wc_error = blk_status_to_errno(bio->bi_status); | |
a9e2ae39 | 497 | } |
a7f6a5fb | 498 | |
a7f6a5fb | 499 | o2hb_bio_wait_dec(wc, 1); |
b559292e | 500 | bio_put(bio); |
a7f6a5fb MF |
501 | } |
502 | ||
503 | /* Setup a Bio to cover I/O against num_slots slots starting at | |
504 | * start_slot. */ | |
505 | static struct bio *o2hb_setup_one_bio(struct o2hb_region *reg, | |
506 | struct o2hb_bio_wait_ctxt *wc, | |
b559292e | 507 | unsigned int *current_slot, |
0d16dcfe MC |
508 | unsigned int max_slots, int op, |
509 | int op_flags) | |
a7f6a5fb | 510 | { |
b559292e | 511 | int len, current_page; |
a7f6a5fb MF |
512 | unsigned int vec_len, vec_start; |
513 | unsigned int bits = reg->hr_block_bits; | |
514 | unsigned int spp = reg->hr_slots_per_page; | |
b559292e | 515 | unsigned int cs = *current_slot; |
a7f6a5fb MF |
516 | struct bio *bio; |
517 | struct page *page; | |
518 | ||
a7f6a5fb MF |
519 | /* Testing has shown this allocation to take long enough under |
520 | * GFP_KERNEL that the local node can get fenced. It would be | |
521 | * nicest if we could pre-allocate these bios and avoid this | |
522 | * all together. */ | |
b559292e | 523 | bio = bio_alloc(GFP_ATOMIC, 16); |
a7f6a5fb MF |
524 | if (!bio) { |
525 | mlog(ML_ERROR, "Could not alloc slots BIO!\n"); | |
526 | bio = ERR_PTR(-ENOMEM); | |
527 | goto bail; | |
528 | } | |
529 | ||
530 | /* Must put everything in 512 byte sectors for the bio... */ | |
4f024f37 | 531 | bio->bi_iter.bi_sector = (reg->hr_start_block + cs) << (bits - 9); |
74d46992 | 532 | bio_set_dev(bio, reg->hr_bdev); |
a7f6a5fb MF |
533 | bio->bi_private = wc; |
534 | bio->bi_end_io = o2hb_bio_end_io; | |
0d16dcfe | 535 | bio_set_op_attrs(bio, op, op_flags); |
a7f6a5fb | 536 | |
09cbfeaf | 537 | vec_start = (cs << bits) % PAGE_SIZE; |
b559292e PR |
538 | while(cs < max_slots) { |
539 | current_page = cs / spp; | |
540 | page = reg->hr_slot_data[current_page]; | |
a7f6a5fb | 541 | |
09cbfeaf KS |
542 | vec_len = min(PAGE_SIZE - vec_start, |
543 | (max_slots-cs) * (PAGE_SIZE/spp) ); | |
a7f6a5fb MF |
544 | |
545 | mlog(ML_HB_BIO, "page %d, vec_len = %u, vec_start = %u\n", | |
b559292e | 546 | current_page, vec_len, vec_start); |
a7f6a5fb MF |
547 | |
548 | len = bio_add_page(bio, page, vec_len, vec_start); | |
3373de20 | 549 | if (len != vec_len) break; |
a7f6a5fb | 550 | |
09cbfeaf | 551 | cs += vec_len / (PAGE_SIZE/spp); |
a7f6a5fb MF |
552 | vec_start = 0; |
553 | } | |
554 | ||
555 | bail: | |
b559292e | 556 | *current_slot = cs; |
a7f6a5fb MF |
557 | return bio; |
558 | } | |
559 | ||
a7f6a5fb | 560 | static int o2hb_read_slots(struct o2hb_region *reg, |
874b1ef0 | 561 | unsigned int begin_slot, |
a7f6a5fb MF |
562 | unsigned int max_slots) |
563 | { | |
874b1ef0 | 564 | unsigned int current_slot = begin_slot; |
b559292e | 565 | int status; |
a7f6a5fb | 566 | struct o2hb_bio_wait_ctxt wc; |
a7f6a5fb MF |
567 | struct bio *bio; |
568 | ||
b559292e | 569 | o2hb_bio_wait_init(&wc); |
a7f6a5fb | 570 | |
b559292e | 571 | while(current_slot < max_slots) { |
4e49ea4a | 572 | bio = o2hb_setup_one_bio(reg, &wc, ¤t_slot, max_slots, |
0d16dcfe | 573 | REQ_OP_READ, 0); |
a7f6a5fb | 574 | if (IS_ERR(bio)) { |
a7f6a5fb MF |
575 | status = PTR_ERR(bio); |
576 | mlog_errno(status); | |
577 | goto bail_and_wait; | |
578 | } | |
a7f6a5fb | 579 | |
b559292e | 580 | atomic_inc(&wc.wc_num_reqs); |
4e49ea4a | 581 | submit_bio(bio); |
a7f6a5fb MF |
582 | } |
583 | ||
584 | status = 0; | |
585 | ||
586 | bail_and_wait: | |
964f14a0 | 587 | o2hb_wait_on_io(&wc); |
a9e2ae39 MF |
588 | if (wc.wc_error && !status) |
589 | status = wc.wc_error; | |
a7f6a5fb | 590 | |
a7f6a5fb MF |
591 | return status; |
592 | } | |
593 | ||
594 | static int o2hb_issue_node_write(struct o2hb_region *reg, | |
a7f6a5fb MF |
595 | struct o2hb_bio_wait_ctxt *write_wc) |
596 | { | |
597 | int status; | |
598 | unsigned int slot; | |
599 | struct bio *bio; | |
600 | ||
b559292e | 601 | o2hb_bio_wait_init(write_wc); |
a7f6a5fb MF |
602 | |
603 | slot = o2nm_this_node(); | |
604 | ||
0d16dcfe | 605 | bio = o2hb_setup_one_bio(reg, write_wc, &slot, slot+1, REQ_OP_WRITE, |
70fd7614 | 606 | REQ_SYNC); |
a7f6a5fb MF |
607 | if (IS_ERR(bio)) { |
608 | status = PTR_ERR(bio); | |
609 | mlog_errno(status); | |
610 | goto bail; | |
611 | } | |
612 | ||
b559292e | 613 | atomic_inc(&write_wc->wc_num_reqs); |
4e49ea4a | 614 | submit_bio(bio); |
a7f6a5fb | 615 | |
a7f6a5fb MF |
616 | status = 0; |
617 | bail: | |
618 | return status; | |
619 | } | |
620 | ||
621 | static u32 o2hb_compute_block_crc_le(struct o2hb_region *reg, | |
622 | struct o2hb_disk_heartbeat_block *hb_block) | |
623 | { | |
624 | __le32 old_cksum; | |
625 | u32 ret; | |
626 | ||
627 | /* We want to compute the block crc with a 0 value in the | |
628 | * hb_cksum field. Save it off here and replace after the | |
629 | * crc. */ | |
630 | old_cksum = hb_block->hb_cksum; | |
631 | hb_block->hb_cksum = 0; | |
632 | ||
633 | ret = crc32_le(0, (unsigned char *) hb_block, reg->hr_block_bytes); | |
634 | ||
635 | hb_block->hb_cksum = old_cksum; | |
636 | ||
637 | return ret; | |
638 | } | |
639 | ||
640 | static void o2hb_dump_slot(struct o2hb_disk_heartbeat_block *hb_block) | |
641 | { | |
70bacbdb MF |
642 | mlog(ML_ERROR, "Dump slot information: seq = 0x%llx, node = %u, " |
643 | "cksum = 0x%x, generation 0x%llx\n", | |
644 | (long long)le64_to_cpu(hb_block->hb_seq), | |
645 | hb_block->hb_node, le32_to_cpu(hb_block->hb_cksum), | |
646 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
647 | } |
648 | ||
649 | static int o2hb_verify_crc(struct o2hb_region *reg, | |
650 | struct o2hb_disk_heartbeat_block *hb_block) | |
651 | { | |
652 | u32 read, computed; | |
653 | ||
654 | read = le32_to_cpu(hb_block->hb_cksum); | |
655 | computed = o2hb_compute_block_crc_le(reg, hb_block); | |
656 | ||
657 | return read == computed; | |
658 | } | |
659 | ||
d2eece37 SM |
660 | /* |
661 | * Compare the slot data with what we wrote in the last iteration. | |
662 | * If the match fails, print an appropriate error message. This is to | |
663 | * detect errors like... another node hearting on the same slot, | |
664 | * flaky device that is losing writes, etc. | |
665 | * Returns 1 if check succeeds, 0 otherwise. | |
666 | */ | |
667 | static int o2hb_check_own_slot(struct o2hb_region *reg) | |
a7f6a5fb | 668 | { |
a7f6a5fb MF |
669 | struct o2hb_disk_slot *slot; |
670 | struct o2hb_disk_heartbeat_block *hb_block; | |
33c12a54 | 671 | char *errstr; |
a7f6a5fb | 672 | |
33c12a54 | 673 | slot = ®->hr_slots[o2nm_this_node()]; |
a7f6a5fb | 674 | /* Don't check on our 1st timestamp */ |
33c12a54 | 675 | if (!slot->ds_last_time) |
d2eece37 | 676 | return 0; |
a7f6a5fb | 677 | |
33c12a54 SM |
678 | hb_block = slot->ds_raw_block; |
679 | if (le64_to_cpu(hb_block->hb_seq) == slot->ds_last_time && | |
680 | le64_to_cpu(hb_block->hb_generation) == slot->ds_last_generation && | |
681 | hb_block->hb_node == slot->ds_node_num) | |
d2eece37 | 682 | return 1; |
a7f6a5fb | 683 | |
33c12a54 SM |
684 | #define ERRSTR1 "Another node is heartbeating on device" |
685 | #define ERRSTR2 "Heartbeat generation mismatch on device" | |
686 | #define ERRSTR3 "Heartbeat sequence mismatch on device" | |
687 | ||
688 | if (hb_block->hb_node != slot->ds_node_num) | |
689 | errstr = ERRSTR1; | |
690 | else if (le64_to_cpu(hb_block->hb_generation) != | |
691 | slot->ds_last_generation) | |
692 | errstr = ERRSTR2; | |
693 | else | |
694 | errstr = ERRSTR3; | |
695 | ||
696 | mlog(ML_ERROR, "%s (%s): expected(%u:0x%llx, 0x%llx), " | |
697 | "ondisk(%u:0x%llx, 0x%llx)\n", errstr, reg->hr_dev_name, | |
698 | slot->ds_node_num, (unsigned long long)slot->ds_last_generation, | |
699 | (unsigned long long)slot->ds_last_time, hb_block->hb_node, | |
700 | (unsigned long long)le64_to_cpu(hb_block->hb_generation), | |
701 | (unsigned long long)le64_to_cpu(hb_block->hb_seq)); | |
d2eece37 SM |
702 | |
703 | return 0; | |
a7f6a5fb MF |
704 | } |
705 | ||
706 | static inline void o2hb_prepare_block(struct o2hb_region *reg, | |
707 | u64 generation) | |
708 | { | |
709 | int node_num; | |
710 | u64 cputime; | |
711 | struct o2hb_disk_slot *slot; | |
712 | struct o2hb_disk_heartbeat_block *hb_block; | |
713 | ||
714 | node_num = o2nm_this_node(); | |
715 | slot = ®->hr_slots[node_num]; | |
716 | ||
717 | hb_block = (struct o2hb_disk_heartbeat_block *)slot->ds_raw_block; | |
718 | memset(hb_block, 0, reg->hr_block_bytes); | |
719 | /* TODO: time stuff */ | |
c62c38f6 | 720 | cputime = ktime_get_real_seconds(); |
a7f6a5fb MF |
721 | if (!cputime) |
722 | cputime = 1; | |
723 | ||
724 | hb_block->hb_seq = cpu_to_le64(cputime); | |
725 | hb_block->hb_node = node_num; | |
726 | hb_block->hb_generation = cpu_to_le64(generation); | |
0db638f4 | 727 | hb_block->hb_dead_ms = cpu_to_le32(o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS); |
a7f6a5fb MF |
728 | |
729 | /* This step must always happen last! */ | |
730 | hb_block->hb_cksum = cpu_to_le32(o2hb_compute_block_crc_le(reg, | |
731 | hb_block)); | |
732 | ||
70bacbdb | 733 | mlog(ML_HB_BIO, "our node generation = 0x%llx, cksum = 0x%x\n", |
5fdf1e67 | 734 | (long long)generation, |
70bacbdb | 735 | le32_to_cpu(hb_block->hb_cksum)); |
a7f6a5fb MF |
736 | } |
737 | ||
738 | static void o2hb_fire_callbacks(struct o2hb_callback *hbcall, | |
739 | struct o2nm_node *node, | |
740 | int idx) | |
741 | { | |
a7f6a5fb MF |
742 | struct o2hb_callback_func *f; |
743 | ||
df53cd3b | 744 | list_for_each_entry(f, &hbcall->list, hc_item) { |
a7f6a5fb MF |
745 | mlog(ML_HEARTBEAT, "calling funcs %p\n", f); |
746 | (f->hc_func)(node, idx, f->hc_data); | |
747 | } | |
748 | } | |
749 | ||
750 | /* Will run the list in order until we process the passed event */ | |
751 | static void o2hb_run_event_list(struct o2hb_node_event *queued_event) | |
752 | { | |
a7f6a5fb MF |
753 | struct o2hb_callback *hbcall; |
754 | struct o2hb_node_event *event; | |
755 | ||
a7f6a5fb MF |
756 | /* Holding callback sem assures we don't alter the callback |
757 | * lists when doing this, and serializes ourselves with other | |
758 | * processes wanting callbacks. */ | |
759 | down_write(&o2hb_callback_sem); | |
760 | ||
761 | spin_lock(&o2hb_live_lock); | |
762 | while (!list_empty(&o2hb_node_events) | |
763 | && !list_empty(&queued_event->hn_item)) { | |
764 | event = list_entry(o2hb_node_events.next, | |
765 | struct o2hb_node_event, | |
766 | hn_item); | |
767 | list_del_init(&event->hn_item); | |
768 | spin_unlock(&o2hb_live_lock); | |
769 | ||
770 | mlog(ML_HEARTBEAT, "Node %s event for %d\n", | |
771 | event->hn_event_type == O2HB_NODE_UP_CB ? "UP" : "DOWN", | |
772 | event->hn_node_num); | |
773 | ||
774 | hbcall = hbcall_from_type(event->hn_event_type); | |
775 | ||
776 | /* We should *never* have gotten on to the list with a | |
777 | * bad type... This isn't something that we should try | |
778 | * to recover from. */ | |
779 | BUG_ON(IS_ERR(hbcall)); | |
780 | ||
781 | o2hb_fire_callbacks(hbcall, event->hn_node, event->hn_node_num); | |
782 | ||
783 | spin_lock(&o2hb_live_lock); | |
784 | } | |
785 | spin_unlock(&o2hb_live_lock); | |
786 | ||
787 | up_write(&o2hb_callback_sem); | |
788 | } | |
789 | ||
790 | static void o2hb_queue_node_event(struct o2hb_node_event *event, | |
791 | enum o2hb_callback_type type, | |
792 | struct o2nm_node *node, | |
793 | int node_num) | |
794 | { | |
795 | assert_spin_locked(&o2hb_live_lock); | |
796 | ||
0e105d37 SM |
797 | BUG_ON((!node) && (type != O2HB_NODE_DOWN_CB)); |
798 | ||
a7f6a5fb MF |
799 | event->hn_event_type = type; |
800 | event->hn_node = node; | |
801 | event->hn_node_num = node_num; | |
802 | ||
803 | mlog(ML_HEARTBEAT, "Queue node %s event for node %d\n", | |
804 | type == O2HB_NODE_UP_CB ? "UP" : "DOWN", node_num); | |
805 | ||
806 | list_add_tail(&event->hn_item, &o2hb_node_events); | |
807 | } | |
808 | ||
809 | static void o2hb_shutdown_slot(struct o2hb_disk_slot *slot) | |
810 | { | |
811 | struct o2hb_node_event event = | |
812 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
813 | struct o2nm_node *node; | |
6f8648e8 | 814 | int queued = 0; |
a7f6a5fb MF |
815 | |
816 | node = o2nm_get_node_by_num(slot->ds_node_num); | |
817 | if (!node) | |
818 | return; | |
819 | ||
820 | spin_lock(&o2hb_live_lock); | |
821 | if (!list_empty(&slot->ds_live_item)) { | |
822 | mlog(ML_HEARTBEAT, "Shutdown, node %d leaves region\n", | |
823 | slot->ds_node_num); | |
824 | ||
825 | list_del_init(&slot->ds_live_item); | |
826 | ||
827 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
828 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
829 | ||
830 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, node, | |
831 | slot->ds_node_num); | |
6f8648e8 | 832 | queued = 1; |
a7f6a5fb MF |
833 | } |
834 | } | |
835 | spin_unlock(&o2hb_live_lock); | |
836 | ||
6f8648e8 J |
837 | if (queued) |
838 | o2hb_run_event_list(&event); | |
a7f6a5fb MF |
839 | |
840 | o2nm_node_put(node); | |
841 | } | |
842 | ||
d2eece37 | 843 | static void o2hb_set_quorum_device(struct o2hb_region *reg) |
43182d2a | 844 | { |
43182d2a SM |
845 | if (!o2hb_global_heartbeat_active()) |
846 | return; | |
847 | ||
d2eece37 SM |
848 | /* Prevent race with o2hb_heartbeat_group_drop_item() */ |
849 | if (kthread_should_stop()) | |
43182d2a SM |
850 | return; |
851 | ||
d2eece37 SM |
852 | /* Tag region as quorum only after thread reaches steady state */ |
853 | if (atomic_read(®->hr_steady_iterations) != 0) | |
854 | return; | |
855 | ||
856 | spin_lock(&o2hb_live_lock); | |
857 | ||
858 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
859 | goto unlock; | |
860 | ||
43182d2a SM |
861 | /* |
862 | * A region can be added to the quorum only when it sees all | |
863 | * live nodes heartbeat on it. In other words, the region has been | |
864 | * added to all nodes. | |
865 | */ | |
866 | if (memcmp(reg->hr_live_node_bitmap, o2hb_live_node_bitmap, | |
867 | sizeof(o2hb_live_node_bitmap))) | |
d2eece37 | 868 | goto unlock; |
43182d2a | 869 | |
d2eece37 SM |
870 | printk(KERN_NOTICE "o2hb: Region %s (%s) is now a quorum device\n", |
871 | config_item_name(®->hr_item), reg->hr_dev_name); | |
43182d2a SM |
872 | |
873 | set_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
58a3158a SM |
874 | |
875 | /* | |
876 | * If global heartbeat active, unpin all regions if the | |
877 | * region count > CUT_OFF | |
878 | */ | |
a8f70de3 | 879 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
880 | O2NM_MAX_REGIONS) > O2HB_PIN_CUT_OFF) |
881 | o2hb_region_unpin(NULL); | |
d2eece37 SM |
882 | unlock: |
883 | spin_unlock(&o2hb_live_lock); | |
43182d2a SM |
884 | } |
885 | ||
a7f6a5fb MF |
886 | static int o2hb_check_slot(struct o2hb_region *reg, |
887 | struct o2hb_disk_slot *slot) | |
888 | { | |
889 | int changed = 0, gen_changed = 0; | |
890 | struct o2hb_node_event event = | |
891 | { .hn_item = LIST_HEAD_INIT(event.hn_item), }; | |
892 | struct o2nm_node *node; | |
893 | struct o2hb_disk_heartbeat_block *hb_block = reg->hr_tmp_block; | |
894 | u64 cputime; | |
0db638f4 MF |
895 | unsigned int dead_ms = o2hb_dead_threshold * O2HB_REGION_TIMEOUT_MS; |
896 | unsigned int slot_dead_ms; | |
0e105d37 | 897 | int tmp; |
6f8648e8 | 898 | int queued = 0; |
a7f6a5fb MF |
899 | |
900 | memcpy(hb_block, slot->ds_raw_block, reg->hr_block_bytes); | |
901 | ||
0e105d37 SM |
902 | /* |
903 | * If a node is no longer configured but is still in the livemap, we | |
904 | * may need to clear that bit from the livemap. | |
905 | */ | |
a7f6a5fb | 906 | node = o2nm_get_node_by_num(slot->ds_node_num); |
0e105d37 SM |
907 | if (!node) { |
908 | spin_lock(&o2hb_live_lock); | |
909 | tmp = test_bit(slot->ds_node_num, o2hb_live_node_bitmap); | |
910 | spin_unlock(&o2hb_live_lock); | |
911 | if (!tmp) | |
912 | return 0; | |
913 | } | |
a7f6a5fb MF |
914 | |
915 | if (!o2hb_verify_crc(reg, hb_block)) { | |
916 | /* all paths from here will drop o2hb_live_lock for | |
917 | * us. */ | |
918 | spin_lock(&o2hb_live_lock); | |
919 | ||
920 | /* Don't print an error on the console in this case - | |
921 | * a freshly formatted heartbeat area will not have a | |
922 | * crc set on it. */ | |
923 | if (list_empty(&slot->ds_live_item)) | |
924 | goto out; | |
925 | ||
926 | /* The node is live but pushed out a bad crc. We | |
927 | * consider it a transient miss but don't populate any | |
928 | * other values as they may be junk. */ | |
929 | mlog(ML_ERROR, "Node %d has written a bad crc to %s\n", | |
930 | slot->ds_node_num, reg->hr_dev_name); | |
931 | o2hb_dump_slot(hb_block); | |
932 | ||
933 | slot->ds_equal_samples++; | |
934 | goto fire_callbacks; | |
935 | } | |
936 | ||
937 | /* we don't care if these wrap.. the state transitions below | |
938 | * clear at the right places */ | |
939 | cputime = le64_to_cpu(hb_block->hb_seq); | |
940 | if (slot->ds_last_time != cputime) | |
941 | slot->ds_changed_samples++; | |
942 | else | |
943 | slot->ds_equal_samples++; | |
944 | slot->ds_last_time = cputime; | |
945 | ||
946 | /* The node changed heartbeat generations. We assume this to | |
947 | * mean it dropped off but came back before we timed out. We | |
948 | * want to consider it down for the time being but don't want | |
949 | * to lose any changed_samples state we might build up to | |
950 | * considering it live again. */ | |
951 | if (slot->ds_last_generation != le64_to_cpu(hb_block->hb_generation)) { | |
952 | gen_changed = 1; | |
953 | slot->ds_equal_samples = 0; | |
70bacbdb MF |
954 | mlog(ML_HEARTBEAT, "Node %d changed generation (0x%llx " |
955 | "to 0x%llx)\n", slot->ds_node_num, | |
956 | (long long)slot->ds_last_generation, | |
957 | (long long)le64_to_cpu(hb_block->hb_generation)); | |
a7f6a5fb MF |
958 | } |
959 | ||
960 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
961 | ||
70bacbdb MF |
962 | mlog(ML_HEARTBEAT, "Slot %d gen 0x%llx cksum 0x%x " |
963 | "seq %llu last %llu changed %u equal %u\n", | |
964 | slot->ds_node_num, (long long)slot->ds_last_generation, | |
965 | le32_to_cpu(hb_block->hb_cksum), | |
2bd63216 | 966 | (unsigned long long)le64_to_cpu(hb_block->hb_seq), |
70bacbdb | 967 | (unsigned long long)slot->ds_last_time, slot->ds_changed_samples, |
a7f6a5fb MF |
968 | slot->ds_equal_samples); |
969 | ||
970 | spin_lock(&o2hb_live_lock); | |
971 | ||
972 | fire_callbacks: | |
973 | /* dead nodes only come to life after some number of | |
974 | * changes at any time during their dead time */ | |
975 | if (list_empty(&slot->ds_live_item) && | |
976 | slot->ds_changed_samples >= O2HB_LIVE_THRESHOLD) { | |
70bacbdb MF |
977 | mlog(ML_HEARTBEAT, "Node %d (id 0x%llx) joined my region\n", |
978 | slot->ds_node_num, (long long)slot->ds_last_generation); | |
a7f6a5fb | 979 | |
823a637a SM |
980 | set_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
981 | ||
a7f6a5fb MF |
982 | /* first on the list generates a callback */ |
983 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
984 | mlog(ML_HEARTBEAT, "o2hb: Add node %d to live nodes " |
985 | "bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
986 | set_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
987 | ||
988 | o2hb_queue_node_event(&event, O2HB_NODE_UP_CB, node, | |
989 | slot->ds_node_num); | |
990 | ||
991 | changed = 1; | |
6f8648e8 | 992 | queued = 1; |
a7f6a5fb MF |
993 | } |
994 | ||
995 | list_add_tail(&slot->ds_live_item, | |
996 | &o2hb_live_slots[slot->ds_node_num]); | |
997 | ||
998 | slot->ds_equal_samples = 0; | |
0db638f4 MF |
999 | |
1000 | /* We want to be sure that all nodes agree on the | |
1001 | * number of milliseconds before a node will be | |
1002 | * considered dead. The self-fencing timeout is | |
1003 | * computed from this value, and a discrepancy might | |
1004 | * result in heartbeat calling a node dead when it | |
1005 | * hasn't self-fenced yet. */ | |
1006 | slot_dead_ms = le32_to_cpu(hb_block->hb_dead_ms); | |
1007 | if (slot_dead_ms && slot_dead_ms != dead_ms) { | |
1008 | /* TODO: Perhaps we can fail the region here. */ | |
1009 | mlog(ML_ERROR, "Node %d on device %s has a dead count " | |
1010 | "of %u ms, but our count is %u ms.\n" | |
1011 | "Please double check your configuration values " | |
1012 | "for 'O2CB_HEARTBEAT_THRESHOLD'\n", | |
1013 | slot->ds_node_num, reg->hr_dev_name, slot_dead_ms, | |
1014 | dead_ms); | |
1015 | } | |
a7f6a5fb MF |
1016 | goto out; |
1017 | } | |
1018 | ||
1019 | /* if the list is dead, we're done.. */ | |
1020 | if (list_empty(&slot->ds_live_item)) | |
1021 | goto out; | |
1022 | ||
1023 | /* live nodes only go dead after enough consequtive missed | |
1024 | * samples.. reset the missed counter whenever we see | |
1025 | * activity */ | |
1026 | if (slot->ds_equal_samples >= o2hb_dead_threshold || gen_changed) { | |
1027 | mlog(ML_HEARTBEAT, "Node %d left my region\n", | |
1028 | slot->ds_node_num); | |
1029 | ||
823a637a SM |
1030 | clear_bit(slot->ds_node_num, reg->hr_live_node_bitmap); |
1031 | ||
a7f6a5fb MF |
1032 | /* last off the live_slot generates a callback */ |
1033 | list_del_init(&slot->ds_live_item); | |
1034 | if (list_empty(&o2hb_live_slots[slot->ds_node_num])) { | |
d6aa1c7c SM |
1035 | mlog(ML_HEARTBEAT, "o2hb: Remove node %d from live " |
1036 | "nodes bitmap\n", slot->ds_node_num); | |
a7f6a5fb MF |
1037 | clear_bit(slot->ds_node_num, o2hb_live_node_bitmap); |
1038 | ||
0e105d37 SM |
1039 | /* node can be null */ |
1040 | o2hb_queue_node_event(&event, O2HB_NODE_DOWN_CB, | |
1041 | node, slot->ds_node_num); | |
a7f6a5fb MF |
1042 | |
1043 | changed = 1; | |
6f8648e8 | 1044 | queued = 1; |
a7f6a5fb MF |
1045 | } |
1046 | ||
1047 | /* We don't clear this because the node is still | |
1048 | * actually writing new blocks. */ | |
1049 | if (!gen_changed) | |
1050 | slot->ds_changed_samples = 0; | |
1051 | goto out; | |
1052 | } | |
1053 | if (slot->ds_changed_samples) { | |
1054 | slot->ds_changed_samples = 0; | |
1055 | slot->ds_equal_samples = 0; | |
1056 | } | |
1057 | out: | |
1058 | spin_unlock(&o2hb_live_lock); | |
1059 | ||
6f8648e8 J |
1060 | if (queued) |
1061 | o2hb_run_event_list(&event); | |
a7f6a5fb | 1062 | |
0e105d37 SM |
1063 | if (node) |
1064 | o2nm_node_put(node); | |
a7f6a5fb MF |
1065 | return changed; |
1066 | } | |
1067 | ||
518df6bd | 1068 | static int o2hb_highest_node(unsigned long *nodes, int numbits) |
a7f6a5fb | 1069 | { |
518df6bd | 1070 | return find_last_bit(nodes, numbits); |
a7f6a5fb MF |
1071 | } |
1072 | ||
874b1ef0 JG |
1073 | static int o2hb_lowest_node(unsigned long *nodes, int numbits) |
1074 | { | |
1075 | return find_first_bit(nodes, numbits); | |
1076 | } | |
1077 | ||
a9e2ae39 | 1078 | static int o2hb_do_disk_heartbeat(struct o2hb_region *reg) |
a7f6a5fb | 1079 | { |
874b1ef0 | 1080 | int i, ret, highest_node, lowest_node; |
d2eece37 | 1081 | int membership_change = 0, own_slot_ok = 0; |
a7f6a5fb | 1082 | unsigned long configured_nodes[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
0e105d37 | 1083 | unsigned long live_node_bitmap[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
a7f6a5fb MF |
1084 | struct o2hb_bio_wait_ctxt write_wc; |
1085 | ||
a9e2ae39 MF |
1086 | ret = o2nm_configured_node_map(configured_nodes, |
1087 | sizeof(configured_nodes)); | |
1088 | if (ret) { | |
1089 | mlog_errno(ret); | |
d2eece37 | 1090 | goto bail; |
a9e2ae39 | 1091 | } |
a7f6a5fb | 1092 | |
0e105d37 SM |
1093 | /* |
1094 | * If a node is not configured but is in the livemap, we still need | |
1095 | * to read the slot so as to be able to remove it from the livemap. | |
1096 | */ | |
1097 | o2hb_fill_node_map(live_node_bitmap, sizeof(live_node_bitmap)); | |
1098 | i = -1; | |
1099 | while ((i = find_next_bit(live_node_bitmap, | |
1100 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
1101 | set_bit(i, configured_nodes); | |
1102 | } | |
1103 | ||
a7f6a5fb | 1104 | highest_node = o2hb_highest_node(configured_nodes, O2NM_MAX_NODES); |
874b1ef0 JG |
1105 | lowest_node = o2hb_lowest_node(configured_nodes, O2NM_MAX_NODES); |
1106 | if (highest_node >= O2NM_MAX_NODES || lowest_node >= O2NM_MAX_NODES) { | |
d2eece37 SM |
1107 | mlog(ML_NOTICE, "o2hb: No configured nodes found!\n"); |
1108 | ret = -EINVAL; | |
1109 | goto bail; | |
a7f6a5fb MF |
1110 | } |
1111 | ||
1112 | /* No sense in reading the slots of nodes that don't exist | |
1113 | * yet. Of course, if the node definitions have holes in them | |
1114 | * then we're reading an empty slot anyway... Consider this | |
1115 | * best-effort. */ | |
874b1ef0 | 1116 | ret = o2hb_read_slots(reg, lowest_node, highest_node + 1); |
a7f6a5fb MF |
1117 | if (ret < 0) { |
1118 | mlog_errno(ret); | |
d2eece37 | 1119 | goto bail; |
a7f6a5fb MF |
1120 | } |
1121 | ||
1122 | /* With an up to date view of the slots, we can check that no | |
1123 | * other node has been improperly configured to heartbeat in | |
1124 | * our slot. */ | |
d2eece37 | 1125 | own_slot_ok = o2hb_check_own_slot(reg); |
a7f6a5fb MF |
1126 | |
1127 | /* fill in the proper info for our next heartbeat */ | |
1128 | o2hb_prepare_block(reg, reg->hr_generation); | |
1129 | ||
b559292e | 1130 | ret = o2hb_issue_node_write(reg, &write_wc); |
a7f6a5fb MF |
1131 | if (ret < 0) { |
1132 | mlog_errno(ret); | |
d2eece37 | 1133 | goto bail; |
a7f6a5fb MF |
1134 | } |
1135 | ||
1136 | i = -1; | |
33c12a54 SM |
1137 | while((i = find_next_bit(configured_nodes, |
1138 | O2NM_MAX_NODES, i + 1)) < O2NM_MAX_NODES) { | |
d2eece37 | 1139 | membership_change |= o2hb_check_slot(reg, ®->hr_slots[i]); |
a7f6a5fb MF |
1140 | } |
1141 | ||
1142 | /* | |
1143 | * We have to be sure we've advertised ourselves on disk | |
1144 | * before we can go to steady state. This ensures that | |
1145 | * people we find in our steady state have seen us. | |
1146 | */ | |
964f14a0 | 1147 | o2hb_wait_on_io(&write_wc); |
a9e2ae39 MF |
1148 | if (write_wc.wc_error) { |
1149 | /* Do not re-arm the write timeout on I/O error - we | |
1150 | * can't be sure that the new block ever made it to | |
1151 | * disk */ | |
1152 | mlog(ML_ERROR, "Write error %d on device \"%s\"\n", | |
1153 | write_wc.wc_error, reg->hr_dev_name); | |
d2eece37 SM |
1154 | ret = write_wc.wc_error; |
1155 | goto bail; | |
a9e2ae39 MF |
1156 | } |
1157 | ||
d2eece37 SM |
1158 | /* Skip disarming the timeout if own slot has stale/bad data */ |
1159 | if (own_slot_ok) { | |
1160 | o2hb_set_quorum_device(reg); | |
e0cbb798 | 1161 | o2hb_arm_timeout(reg); |
6633ca57 | 1162 | reg->hr_last_timeout_start = jiffies; |
d2eece37 | 1163 | } |
a7f6a5fb | 1164 | |
d2eece37 | 1165 | bail: |
a7f6a5fb | 1166 | /* let the person who launched us know when things are steady */ |
d2eece37 SM |
1167 | if (atomic_read(®->hr_steady_iterations) != 0) { |
1168 | if (!ret && own_slot_ok && !membership_change) { | |
1169 | if (atomic_dec_and_test(®->hr_steady_iterations)) | |
1170 | wake_up(&o2hb_steady_queue); | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
1175 | if (atomic_dec_and_test(®->hr_unsteady_iterations)) { | |
1176 | printk(KERN_NOTICE "o2hb: Unable to stabilize " | |
e926d8a1 | 1177 | "heartbeat on region %s (%s)\n", |
d2eece37 SM |
1178 | config_item_name(®->hr_item), |
1179 | reg->hr_dev_name); | |
1180 | atomic_set(®->hr_steady_iterations, 0); | |
1181 | reg->hr_aborted_start = 1; | |
a7f6a5fb | 1182 | wake_up(&o2hb_steady_queue); |
d2eece37 SM |
1183 | ret = -EIO; |
1184 | } | |
a7f6a5fb | 1185 | } |
a9e2ae39 | 1186 | |
d2eece37 | 1187 | return ret; |
a7f6a5fb MF |
1188 | } |
1189 | ||
a7f6a5fb MF |
1190 | /* |
1191 | * we ride the region ref that the region dir holds. before the region | |
1192 | * dir is removed and drops it ref it will wait to tear down this | |
1193 | * thread. | |
1194 | */ | |
1195 | static int o2hb_thread(void *data) | |
1196 | { | |
1197 | int i, ret; | |
1198 | struct o2hb_region *reg = data; | |
a7f6a5fb | 1199 | struct o2hb_bio_wait_ctxt write_wc; |
40476b82 | 1200 | ktime_t before_hb, after_hb; |
a7f6a5fb MF |
1201 | unsigned int elapsed_msec; |
1202 | ||
1203 | mlog(ML_HEARTBEAT|ML_KTHREAD, "hb thread running\n"); | |
1204 | ||
8698a745 | 1205 | set_user_nice(current, MIN_NICE); |
a7f6a5fb | 1206 | |
cfc069d3 | 1207 | /* Pin node */ |
0986fe9b JQ |
1208 | ret = o2nm_depend_this_node(); |
1209 | if (ret) { | |
1210 | mlog(ML_ERROR, "Node has been deleted, ret = %d\n", ret); | |
1211 | reg->hr_node_deleted = 1; | |
1212 | wake_up(&o2hb_steady_queue); | |
1213 | return 0; | |
1214 | } | |
cfc069d3 | 1215 | |
d2eece37 SM |
1216 | while (!kthread_should_stop() && |
1217 | !reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
a7f6a5fb | 1218 | /* We track the time spent inside |
025dfdaf | 1219 | * o2hb_do_disk_heartbeat so that we avoid more than |
a7f6a5fb MF |
1220 | * hr_timeout_ms between disk writes. On busy systems |
1221 | * this should result in a heartbeat which is less | |
1222 | * likely to time itself out. */ | |
40476b82 | 1223 | before_hb = ktime_get_real(); |
a7f6a5fb | 1224 | |
d2eece37 | 1225 | ret = o2hb_do_disk_heartbeat(reg); |
88dbe98d | 1226 | reg->hr_last_hb_status = ret; |
a7f6a5fb | 1227 | |
40476b82 TR |
1228 | after_hb = ktime_get_real(); |
1229 | ||
1230 | elapsed_msec = (unsigned int) | |
1231 | ktime_ms_delta(after_hb, before_hb); | |
a7f6a5fb | 1232 | |
b31d308d | 1233 | mlog(ML_HEARTBEAT, |
40476b82 | 1234 | "start = %lld, end = %lld, msec = %u, ret = %d\n", |
2456e855 | 1235 | before_hb, after_hb, elapsed_msec, ret); |
a7f6a5fb | 1236 | |
d2eece37 SM |
1237 | if (!kthread_should_stop() && |
1238 | elapsed_msec < reg->hr_timeout_ms) { | |
a7f6a5fb MF |
1239 | /* the kthread api has blocked signals for us so no |
1240 | * need to record the return value. */ | |
1241 | msleep_interruptible(reg->hr_timeout_ms - elapsed_msec); | |
1242 | } | |
1243 | } | |
1244 | ||
e0cbb798 | 1245 | o2hb_disarm_timeout(reg); |
a7f6a5fb MF |
1246 | |
1247 | /* unclean stop is only used in very bad situation */ | |
1248 | for(i = 0; !reg->hr_unclean_stop && i < reg->hr_blocks; i++) | |
1249 | o2hb_shutdown_slot(®->hr_slots[i]); | |
1250 | ||
1251 | /* Explicit down notification - avoid forcing the other nodes | |
1252 | * to timeout on this region when we could just as easily | |
1253 | * write a clear generation - thus indicating to them that | |
1254 | * this node has left this region. | |
d2eece37 SM |
1255 | */ |
1256 | if (!reg->hr_unclean_stop && !reg->hr_aborted_start) { | |
1257 | o2hb_prepare_block(reg, 0); | |
1258 | ret = o2hb_issue_node_write(reg, &write_wc); | |
1259 | if (ret == 0) | |
964f14a0 | 1260 | o2hb_wait_on_io(&write_wc); |
d2eece37 SM |
1261 | else |
1262 | mlog_errno(ret); | |
a7f6a5fb MF |
1263 | } |
1264 | ||
cfc069d3 SM |
1265 | /* Unpin node */ |
1266 | o2nm_undepend_this_node(); | |
a7f6a5fb | 1267 | |
d2eece37 | 1268 | mlog(ML_HEARTBEAT|ML_KTHREAD, "o2hb thread exiting\n"); |
a7f6a5fb MF |
1269 | |
1270 | return 0; | |
1271 | } | |
1272 | ||
87d3d3f3 SM |
1273 | #ifdef CONFIG_DEBUG_FS |
1274 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1275 | { | |
8ca8b0bb | 1276 | struct o2hb_debug_buf *db = inode->i_private; |
1f285305 | 1277 | struct o2hb_region *reg; |
87d3d3f3 | 1278 | unsigned long map[BITS_TO_LONGS(O2NM_MAX_NODES)]; |
bb570a5d | 1279 | unsigned long lts; |
87d3d3f3 SM |
1280 | char *buf = NULL; |
1281 | int i = -1; | |
1282 | int out = 0; | |
1283 | ||
8ca8b0bb SM |
1284 | /* max_nodes should be the largest bitmap we pass here */ |
1285 | BUG_ON(sizeof(map) < db->db_size); | |
1286 | ||
87d3d3f3 SM |
1287 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
1288 | if (!buf) | |
1289 | goto bail; | |
1290 | ||
8ca8b0bb SM |
1291 | switch (db->db_type) { |
1292 | case O2HB_DB_TYPE_LIVENODES: | |
a6de0136 SM |
1293 | case O2HB_DB_TYPE_LIVEREGIONS: |
1294 | case O2HB_DB_TYPE_QUORUMREGIONS: | |
1295 | case O2HB_DB_TYPE_FAILEDREGIONS: | |
8ca8b0bb SM |
1296 | spin_lock(&o2hb_live_lock); |
1297 | memcpy(map, db->db_data, db->db_size); | |
1298 | spin_unlock(&o2hb_live_lock); | |
1299 | break; | |
87d3d3f3 | 1300 | |
1f285305 SM |
1301 | case O2HB_DB_TYPE_REGION_LIVENODES: |
1302 | spin_lock(&o2hb_live_lock); | |
1303 | reg = (struct o2hb_region *)db->db_data; | |
1304 | memcpy(map, reg->hr_live_node_bitmap, db->db_size); | |
1305 | spin_unlock(&o2hb_live_lock); | |
1306 | break; | |
1307 | ||
1308 | case O2HB_DB_TYPE_REGION_NUMBER: | |
1309 | reg = (struct o2hb_region *)db->db_data; | |
1310 | out += snprintf(buf + out, PAGE_SIZE - out, "%d\n", | |
1311 | reg->hr_region_num); | |
1312 | goto done; | |
1313 | ||
43695d09 SM |
1314 | case O2HB_DB_TYPE_REGION_ELAPSED_TIME: |
1315 | reg = (struct o2hb_region *)db->db_data; | |
bb570a5d SM |
1316 | lts = reg->hr_last_timeout_start; |
1317 | /* If 0, it has never been set before */ | |
1318 | if (lts) | |
1319 | lts = jiffies_to_msecs(jiffies - lts); | |
1320 | out += snprintf(buf + out, PAGE_SIZE - out, "%lu\n", lts); | |
43695d09 SM |
1321 | goto done; |
1322 | ||
cb0586bd SM |
1323 | case O2HB_DB_TYPE_REGION_PINNED: |
1324 | reg = (struct o2hb_region *)db->db_data; | |
1325 | out += snprintf(buf + out, PAGE_SIZE - out, "%u\n", | |
1326 | !!reg->hr_item_pinned); | |
1327 | goto done; | |
1328 | ||
8ca8b0bb SM |
1329 | default: |
1330 | goto done; | |
1331 | } | |
1332 | ||
1333 | while ((i = find_next_bit(map, db->db_len, i + 1)) < db->db_len) | |
87d3d3f3 SM |
1334 | out += snprintf(buf + out, PAGE_SIZE - out, "%d ", i); |
1335 | out += snprintf(buf + out, PAGE_SIZE - out, "\n"); | |
1336 | ||
8ca8b0bb | 1337 | done: |
87d3d3f3 SM |
1338 | i_size_write(inode, out); |
1339 | ||
1340 | file->private_data = buf; | |
1341 | ||
1342 | return 0; | |
1343 | bail: | |
1344 | return -ENOMEM; | |
1345 | } | |
1346 | ||
1347 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1348 | { | |
1349 | kfree(file->private_data); | |
1350 | return 0; | |
1351 | } | |
1352 | ||
1353 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1354 | size_t nbytes, loff_t *ppos) | |
1355 | { | |
1356 | return simple_read_from_buffer(buf, nbytes, ppos, file->private_data, | |
1357 | i_size_read(file->f_mapping->host)); | |
1358 | } | |
1359 | #else | |
1360 | static int o2hb_debug_open(struct inode *inode, struct file *file) | |
1361 | { | |
1362 | return 0; | |
1363 | } | |
1364 | static int o2hb_debug_release(struct inode *inode, struct file *file) | |
1365 | { | |
1366 | return 0; | |
1367 | } | |
1368 | static ssize_t o2hb_debug_read(struct file *file, char __user *buf, | |
1369 | size_t nbytes, loff_t *ppos) | |
1370 | { | |
1371 | return 0; | |
1372 | } | |
1373 | #endif /* CONFIG_DEBUG_FS */ | |
1374 | ||
828c0950 | 1375 | static const struct file_operations o2hb_debug_fops = { |
87d3d3f3 SM |
1376 | .open = o2hb_debug_open, |
1377 | .release = o2hb_debug_release, | |
1378 | .read = o2hb_debug_read, | |
1379 | .llseek = generic_file_llseek, | |
1380 | }; | |
1381 | ||
1382 | void o2hb_exit(void) | |
1383 | { | |
e581595e | 1384 | debugfs_remove_recursive(o2hb_debug_dir); |
a4a1dfa4 JQ |
1385 | kfree(o2hb_db_livenodes); |
1386 | kfree(o2hb_db_liveregions); | |
1387 | kfree(o2hb_db_quorumregions); | |
1388 | kfree(o2hb_db_failedregions); | |
8ca8b0bb SM |
1389 | } |
1390 | ||
5e7a3ed9 GKH |
1391 | static void o2hb_debug_create(const char *name, struct dentry *dir, |
1392 | struct o2hb_debug_buf **db, int db_len, int type, | |
1393 | int size, int len, void *data) | |
8ca8b0bb SM |
1394 | { |
1395 | *db = kmalloc(db_len, GFP_KERNEL); | |
1396 | if (!*db) | |
5e7a3ed9 | 1397 | return; |
8ca8b0bb SM |
1398 | |
1399 | (*db)->db_type = type; | |
1400 | (*db)->db_size = size; | |
1401 | (*db)->db_len = len; | |
1402 | (*db)->db_data = data; | |
1403 | ||
5e7a3ed9 | 1404 | debugfs_create_file(name, S_IFREG|S_IRUSR, dir, *db, &o2hb_debug_fops); |
8ca8b0bb SM |
1405 | } |
1406 | ||
e581595e | 1407 | static void o2hb_debug_init(void) |
8ca8b0bb | 1408 | { |
8ca8b0bb | 1409 | o2hb_debug_dir = debugfs_create_dir(O2HB_DEBUG_DIR, NULL); |
a6de0136 | 1410 | |
e581595e GKH |
1411 | o2hb_debug_create(O2HB_DEBUG_LIVENODES, o2hb_debug_dir, |
1412 | &o2hb_db_livenodes, sizeof(*o2hb_db_livenodes), | |
1413 | O2HB_DB_TYPE_LIVENODES, sizeof(o2hb_live_node_bitmap), | |
1414 | O2NM_MAX_NODES, o2hb_live_node_bitmap); | |
1415 | ||
1416 | o2hb_debug_create(O2HB_DEBUG_LIVEREGIONS, o2hb_debug_dir, | |
1417 | &o2hb_db_liveregions, sizeof(*o2hb_db_liveregions), | |
1418 | O2HB_DB_TYPE_LIVEREGIONS, | |
1419 | sizeof(o2hb_live_region_bitmap), O2NM_MAX_REGIONS, | |
1420 | o2hb_live_region_bitmap); | |
1421 | ||
1422 | o2hb_debug_create(O2HB_DEBUG_QUORUMREGIONS, o2hb_debug_dir, | |
1423 | &o2hb_db_quorumregions, | |
1424 | sizeof(*o2hb_db_quorumregions), | |
1425 | O2HB_DB_TYPE_QUORUMREGIONS, | |
1426 | sizeof(o2hb_quorum_region_bitmap), O2NM_MAX_REGIONS, | |
1427 | o2hb_quorum_region_bitmap); | |
1428 | ||
1429 | o2hb_debug_create(O2HB_DEBUG_FAILEDREGIONS, o2hb_debug_dir, | |
1430 | &o2hb_db_failedregions, | |
1431 | sizeof(*o2hb_db_failedregions), | |
1432 | O2HB_DB_TYPE_FAILEDREGIONS, | |
1433 | sizeof(o2hb_failed_region_bitmap), O2NM_MAX_REGIONS, | |
1434 | o2hb_failed_region_bitmap); | |
87d3d3f3 SM |
1435 | } |
1436 | ||
e581595e | 1437 | void o2hb_init(void) |
a7f6a5fb MF |
1438 | { |
1439 | int i; | |
1440 | ||
1441 | for (i = 0; i < ARRAY_SIZE(o2hb_callbacks); i++) | |
1442 | INIT_LIST_HEAD(&o2hb_callbacks[i].list); | |
1443 | ||
1444 | for (i = 0; i < ARRAY_SIZE(o2hb_live_slots); i++) | |
1445 | INIT_LIST_HEAD(&o2hb_live_slots[i]); | |
1446 | ||
1447 | INIT_LIST_HEAD(&o2hb_node_events); | |
1448 | ||
1449 | memset(o2hb_live_node_bitmap, 0, sizeof(o2hb_live_node_bitmap)); | |
536f0741 | 1450 | memset(o2hb_region_bitmap, 0, sizeof(o2hb_region_bitmap)); |
e7d656ba | 1451 | memset(o2hb_live_region_bitmap, 0, sizeof(o2hb_live_region_bitmap)); |
43182d2a | 1452 | memset(o2hb_quorum_region_bitmap, 0, sizeof(o2hb_quorum_region_bitmap)); |
b1c5ebfb | 1453 | memset(o2hb_failed_region_bitmap, 0, sizeof(o2hb_failed_region_bitmap)); |
87d3d3f3 | 1454 | |
58a3158a SM |
1455 | o2hb_dependent_users = 0; |
1456 | ||
e581595e | 1457 | o2hb_debug_init(); |
a7f6a5fb MF |
1458 | } |
1459 | ||
1460 | /* if we're already in a callback then we're already serialized by the sem */ | |
1461 | static void o2hb_fill_node_map_from_callback(unsigned long *map, | |
1462 | unsigned bytes) | |
1463 | { | |
1464 | BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long))); | |
1465 | ||
1466 | memcpy(map, &o2hb_live_node_bitmap, bytes); | |
1467 | } | |
1468 | ||
1469 | /* | |
1470 | * get a map of all nodes that are heartbeating in any regions | |
1471 | */ | |
1472 | void o2hb_fill_node_map(unsigned long *map, unsigned bytes) | |
1473 | { | |
1474 | /* callers want to serialize this map and callbacks so that they | |
1475 | * can trust that they don't miss nodes coming to the party */ | |
1476 | down_read(&o2hb_callback_sem); | |
1477 | spin_lock(&o2hb_live_lock); | |
1478 | o2hb_fill_node_map_from_callback(map, bytes); | |
1479 | spin_unlock(&o2hb_live_lock); | |
1480 | up_read(&o2hb_callback_sem); | |
1481 | } | |
1482 | EXPORT_SYMBOL_GPL(o2hb_fill_node_map); | |
1483 | ||
1484 | /* | |
1485 | * heartbeat configfs bits. The heartbeat set is a default set under | |
1486 | * the cluster set in nodemanager.c. | |
1487 | */ | |
1488 | ||
1489 | static struct o2hb_region *to_o2hb_region(struct config_item *item) | |
1490 | { | |
1491 | return item ? container_of(item, struct o2hb_region, hr_item) : NULL; | |
1492 | } | |
1493 | ||
1494 | /* drop_item only drops its ref after killing the thread, nothing should | |
1495 | * be using the region anymore. this has to clean up any state that | |
1496 | * attributes might have built up. */ | |
1497 | static void o2hb_region_release(struct config_item *item) | |
1498 | { | |
1499 | int i; | |
1500 | struct page *page; | |
1501 | struct o2hb_region *reg = to_o2hb_region(item); | |
1502 | ||
d2eece37 SM |
1503 | mlog(ML_HEARTBEAT, "hb region release (%s)\n", reg->hr_dev_name); |
1504 | ||
d787ab09 | 1505 | kfree(reg->hr_tmp_block); |
a7f6a5fb MF |
1506 | |
1507 | if (reg->hr_slot_data) { | |
1508 | for (i = 0; i < reg->hr_num_pages; i++) { | |
1509 | page = reg->hr_slot_data[i]; | |
1510 | if (page) | |
1511 | __free_page(page); | |
1512 | } | |
1513 | kfree(reg->hr_slot_data); | |
1514 | } | |
1515 | ||
1516 | if (reg->hr_bdev) | |
9a1c3542 | 1517 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb | 1518 | |
d787ab09 | 1519 | kfree(reg->hr_slots); |
a7f6a5fb | 1520 | |
5e7a3ed9 | 1521 | debugfs_remove_recursive(reg->hr_debug_dir); |
a4a1dfa4 JQ |
1522 | kfree(reg->hr_db_livenodes); |
1523 | kfree(reg->hr_db_regnum); | |
9e13f1f9 JB |
1524 | kfree(reg->hr_db_elapsed_time); |
1525 | kfree(reg->hr_db_pinned); | |
1f285305 | 1526 | |
a7f6a5fb MF |
1527 | spin_lock(&o2hb_live_lock); |
1528 | list_del(®->hr_all_item); | |
1529 | spin_unlock(&o2hb_live_lock); | |
1530 | ||
34069b88 | 1531 | o2net_unregister_handler_list(®->hr_handler_list); |
a7f6a5fb MF |
1532 | kfree(reg); |
1533 | } | |
1534 | ||
1535 | static int o2hb_read_block_input(struct o2hb_region *reg, | |
1536 | const char *page, | |
a7f6a5fb MF |
1537 | unsigned long *ret_bytes, |
1538 | unsigned int *ret_bits) | |
1539 | { | |
1540 | unsigned long bytes; | |
1541 | char *p = (char *)page; | |
1542 | ||
1543 | bytes = simple_strtoul(p, &p, 0); | |
1544 | if (!p || (*p && (*p != '\n'))) | |
1545 | return -EINVAL; | |
1546 | ||
1547 | /* Heartbeat and fs min / max block sizes are the same. */ | |
1548 | if (bytes > 4096 || bytes < 512) | |
1549 | return -ERANGE; | |
1550 | if (hweight16(bytes) != 1) | |
1551 | return -EINVAL; | |
1552 | ||
1553 | if (ret_bytes) | |
1554 | *ret_bytes = bytes; | |
1555 | if (ret_bits) | |
1556 | *ret_bits = ffs(bytes) - 1; | |
1557 | ||
1558 | return 0; | |
1559 | } | |
1560 | ||
45b99773 | 1561 | static ssize_t o2hb_region_block_bytes_show(struct config_item *item, |
a7f6a5fb MF |
1562 | char *page) |
1563 | { | |
45b99773 | 1564 | return sprintf(page, "%u\n", to_o2hb_region(item)->hr_block_bytes); |
a7f6a5fb MF |
1565 | } |
1566 | ||
45b99773 | 1567 | static ssize_t o2hb_region_block_bytes_store(struct config_item *item, |
a7f6a5fb MF |
1568 | const char *page, |
1569 | size_t count) | |
1570 | { | |
45b99773 | 1571 | struct o2hb_region *reg = to_o2hb_region(item); |
a7f6a5fb MF |
1572 | int status; |
1573 | unsigned long block_bytes; | |
1574 | unsigned int block_bits; | |
1575 | ||
1576 | if (reg->hr_bdev) | |
1577 | return -EINVAL; | |
1578 | ||
aa6913db JP |
1579 | status = o2hb_read_block_input(reg, page, &block_bytes, |
1580 | &block_bits); | |
a7f6a5fb MF |
1581 | if (status) |
1582 | return status; | |
1583 | ||
1584 | reg->hr_block_bytes = (unsigned int)block_bytes; | |
1585 | reg->hr_block_bits = block_bits; | |
1586 | ||
1587 | return count; | |
1588 | } | |
1589 | ||
45b99773 | 1590 | static ssize_t o2hb_region_start_block_show(struct config_item *item, |
a7f6a5fb MF |
1591 | char *page) |
1592 | { | |
45b99773 | 1593 | return sprintf(page, "%llu\n", to_o2hb_region(item)->hr_start_block); |
a7f6a5fb MF |
1594 | } |
1595 | ||
45b99773 | 1596 | static ssize_t o2hb_region_start_block_store(struct config_item *item, |
a7f6a5fb MF |
1597 | const char *page, |
1598 | size_t count) | |
1599 | { | |
45b99773 | 1600 | struct o2hb_region *reg = to_o2hb_region(item); |
a7f6a5fb MF |
1601 | unsigned long long tmp; |
1602 | char *p = (char *)page; | |
1603 | ||
1604 | if (reg->hr_bdev) | |
1605 | return -EINVAL; | |
1606 | ||
1607 | tmp = simple_strtoull(p, &p, 0); | |
1608 | if (!p || (*p && (*p != '\n'))) | |
1609 | return -EINVAL; | |
1610 | ||
1611 | reg->hr_start_block = tmp; | |
1612 | ||
1613 | return count; | |
1614 | } | |
1615 | ||
45b99773 | 1616 | static ssize_t o2hb_region_blocks_show(struct config_item *item, char *page) |
a7f6a5fb | 1617 | { |
45b99773 | 1618 | return sprintf(page, "%d\n", to_o2hb_region(item)->hr_blocks); |
a7f6a5fb MF |
1619 | } |
1620 | ||
45b99773 | 1621 | static ssize_t o2hb_region_blocks_store(struct config_item *item, |
a7f6a5fb MF |
1622 | const char *page, |
1623 | size_t count) | |
1624 | { | |
45b99773 | 1625 | struct o2hb_region *reg = to_o2hb_region(item); |
a7f6a5fb MF |
1626 | unsigned long tmp; |
1627 | char *p = (char *)page; | |
1628 | ||
1629 | if (reg->hr_bdev) | |
1630 | return -EINVAL; | |
1631 | ||
1632 | tmp = simple_strtoul(p, &p, 0); | |
1633 | if (!p || (*p && (*p != '\n'))) | |
1634 | return -EINVAL; | |
1635 | ||
1636 | if (tmp > O2NM_MAX_NODES || tmp == 0) | |
1637 | return -ERANGE; | |
1638 | ||
1639 | reg->hr_blocks = (unsigned int)tmp; | |
1640 | ||
1641 | return count; | |
1642 | } | |
1643 | ||
45b99773 | 1644 | static ssize_t o2hb_region_dev_show(struct config_item *item, char *page) |
a7f6a5fb MF |
1645 | { |
1646 | unsigned int ret = 0; | |
1647 | ||
45b99773 CH |
1648 | if (to_o2hb_region(item)->hr_bdev) |
1649 | ret = sprintf(page, "%s\n", to_o2hb_region(item)->hr_dev_name); | |
a7f6a5fb MF |
1650 | |
1651 | return ret; | |
1652 | } | |
1653 | ||
1654 | static void o2hb_init_region_params(struct o2hb_region *reg) | |
1655 | { | |
09cbfeaf | 1656 | reg->hr_slots_per_page = PAGE_SIZE >> reg->hr_block_bits; |
a7f6a5fb MF |
1657 | reg->hr_timeout_ms = O2HB_REGION_TIMEOUT_MS; |
1658 | ||
1659 | mlog(ML_HEARTBEAT, "hr_start_block = %llu, hr_blocks = %u\n", | |
1660 | reg->hr_start_block, reg->hr_blocks); | |
1661 | mlog(ML_HEARTBEAT, "hr_block_bytes = %u, hr_block_bits = %u\n", | |
1662 | reg->hr_block_bytes, reg->hr_block_bits); | |
1663 | mlog(ML_HEARTBEAT, "hr_timeout_ms = %u\n", reg->hr_timeout_ms); | |
1664 | mlog(ML_HEARTBEAT, "dead threshold = %u\n", o2hb_dead_threshold); | |
1665 | } | |
1666 | ||
1667 | static int o2hb_map_slot_data(struct o2hb_region *reg) | |
1668 | { | |
1669 | int i, j; | |
1670 | unsigned int last_slot; | |
1671 | unsigned int spp = reg->hr_slots_per_page; | |
1672 | struct page *page; | |
1673 | char *raw; | |
1674 | struct o2hb_disk_slot *slot; | |
1675 | ||
1676 | reg->hr_tmp_block = kmalloc(reg->hr_block_bytes, GFP_KERNEL); | |
372a447c | 1677 | if (reg->hr_tmp_block == NULL) |
a7f6a5fb | 1678 | return -ENOMEM; |
a7f6a5fb MF |
1679 | |
1680 | reg->hr_slots = kcalloc(reg->hr_blocks, | |
1681 | sizeof(struct o2hb_disk_slot), GFP_KERNEL); | |
372a447c | 1682 | if (reg->hr_slots == NULL) |
a7f6a5fb | 1683 | return -ENOMEM; |
a7f6a5fb MF |
1684 | |
1685 | for(i = 0; i < reg->hr_blocks; i++) { | |
1686 | slot = ®->hr_slots[i]; | |
1687 | slot->ds_node_num = i; | |
1688 | INIT_LIST_HEAD(&slot->ds_live_item); | |
1689 | slot->ds_raw_block = NULL; | |
1690 | } | |
1691 | ||
1692 | reg->hr_num_pages = (reg->hr_blocks + spp - 1) / spp; | |
1693 | mlog(ML_HEARTBEAT, "Going to require %u pages to cover %u blocks " | |
1694 | "at %u blocks per page\n", | |
1695 | reg->hr_num_pages, reg->hr_blocks, spp); | |
1696 | ||
1697 | reg->hr_slot_data = kcalloc(reg->hr_num_pages, sizeof(struct page *), | |
1698 | GFP_KERNEL); | |
372a447c | 1699 | if (!reg->hr_slot_data) |
a7f6a5fb | 1700 | return -ENOMEM; |
a7f6a5fb MF |
1701 | |
1702 | for(i = 0; i < reg->hr_num_pages; i++) { | |
1703 | page = alloc_page(GFP_KERNEL); | |
372a447c | 1704 | if (!page) |
a7f6a5fb | 1705 | return -ENOMEM; |
a7f6a5fb MF |
1706 | |
1707 | reg->hr_slot_data[i] = page; | |
1708 | ||
1709 | last_slot = i * spp; | |
1710 | raw = page_address(page); | |
1711 | for (j = 0; | |
1712 | (j < spp) && ((j + last_slot) < reg->hr_blocks); | |
1713 | j++) { | |
1714 | BUG_ON((j + last_slot) >= reg->hr_blocks); | |
1715 | ||
1716 | slot = ®->hr_slots[j + last_slot]; | |
1717 | slot->ds_raw_block = | |
1718 | (struct o2hb_disk_heartbeat_block *) raw; | |
1719 | ||
1720 | raw += reg->hr_block_bytes; | |
1721 | } | |
1722 | } | |
1723 | ||
1724 | return 0; | |
1725 | } | |
1726 | ||
1727 | /* Read in all the slots available and populate the tracking | |
1728 | * structures so that we can start with a baseline idea of what's | |
1729 | * there. */ | |
1730 | static int o2hb_populate_slot_data(struct o2hb_region *reg) | |
1731 | { | |
1732 | int ret, i; | |
1733 | struct o2hb_disk_slot *slot; | |
1734 | struct o2hb_disk_heartbeat_block *hb_block; | |
1735 | ||
874b1ef0 | 1736 | ret = o2hb_read_slots(reg, 0, reg->hr_blocks); |
372a447c | 1737 | if (ret) |
a7f6a5fb | 1738 | goto out; |
a7f6a5fb MF |
1739 | |
1740 | /* We only want to get an idea of the values initially in each | |
1741 | * slot, so we do no verification - o2hb_check_slot will | |
1742 | * actually determine if each configured slot is valid and | |
1743 | * whether any values have changed. */ | |
1744 | for(i = 0; i < reg->hr_blocks; i++) { | |
1745 | slot = ®->hr_slots[i]; | |
1746 | hb_block = (struct o2hb_disk_heartbeat_block *) slot->ds_raw_block; | |
1747 | ||
1748 | /* Only fill the values that o2hb_check_slot uses to | |
1749 | * determine changing slots */ | |
1750 | slot->ds_last_time = le64_to_cpu(hb_block->hb_seq); | |
1751 | slot->ds_last_generation = le64_to_cpu(hb_block->hb_generation); | |
1752 | } | |
1753 | ||
1754 | out: | |
a7f6a5fb MF |
1755 | return ret; |
1756 | } | |
1757 | ||
1758 | /* this is acting as commit; we set up all of hr_bdev and hr_task or nothing */ | |
45b99773 | 1759 | static ssize_t o2hb_region_dev_store(struct config_item *item, |
a7f6a5fb MF |
1760 | const char *page, |
1761 | size_t count) | |
1762 | { | |
45b99773 | 1763 | struct o2hb_region *reg = to_o2hb_region(item); |
e6c352db | 1764 | struct task_struct *hb_task; |
a7f6a5fb MF |
1765 | long fd; |
1766 | int sectsize; | |
1767 | char *p = (char *)page; | |
2903ff01 AV |
1768 | struct fd f; |
1769 | struct inode *inode; | |
a7f6a5fb | 1770 | ssize_t ret = -EINVAL; |
76d9fc29 | 1771 | int live_threshold; |
a7f6a5fb MF |
1772 | |
1773 | if (reg->hr_bdev) | |
1774 | goto out; | |
1775 | ||
1776 | /* We can't heartbeat without having had our node number | |
1777 | * configured yet. */ | |
1778 | if (o2nm_this_node() == O2NM_MAX_NODES) | |
1779 | goto out; | |
1780 | ||
1781 | fd = simple_strtol(p, &p, 0); | |
1782 | if (!p || (*p && (*p != '\n'))) | |
1783 | goto out; | |
1784 | ||
1785 | if (fd < 0 || fd >= INT_MAX) | |
1786 | goto out; | |
1787 | ||
2903ff01 AV |
1788 | f = fdget(fd); |
1789 | if (f.file == NULL) | |
a7f6a5fb MF |
1790 | goto out; |
1791 | ||
1792 | if (reg->hr_blocks == 0 || reg->hr_start_block == 0 || | |
1793 | reg->hr_block_bytes == 0) | |
2903ff01 | 1794 | goto out2; |
a7f6a5fb | 1795 | |
2903ff01 | 1796 | inode = igrab(f.file->f_mapping->host); |
a7f6a5fb | 1797 | if (inode == NULL) |
2903ff01 | 1798 | goto out2; |
a7f6a5fb MF |
1799 | |
1800 | if (!S_ISBLK(inode->i_mode)) | |
2903ff01 | 1801 | goto out3; |
a7f6a5fb | 1802 | |
2903ff01 | 1803 | reg->hr_bdev = I_BDEV(f.file->f_mapping->host); |
e525fd89 | 1804 | ret = blkdev_get(reg->hr_bdev, FMODE_WRITE | FMODE_READ, NULL); |
a7f6a5fb MF |
1805 | if (ret) { |
1806 | reg->hr_bdev = NULL; | |
2903ff01 | 1807 | goto out3; |
a7f6a5fb MF |
1808 | } |
1809 | inode = NULL; | |
1810 | ||
1811 | bdevname(reg->hr_bdev, reg->hr_dev_name); | |
1812 | ||
e1defc4f | 1813 | sectsize = bdev_logical_block_size(reg->hr_bdev); |
a7f6a5fb MF |
1814 | if (sectsize != reg->hr_block_bytes) { |
1815 | mlog(ML_ERROR, | |
1816 | "blocksize %u incorrect for device, expected %d", | |
1817 | reg->hr_block_bytes, sectsize); | |
1818 | ret = -EINVAL; | |
2903ff01 | 1819 | goto out3; |
a7f6a5fb MF |
1820 | } |
1821 | ||
1822 | o2hb_init_region_params(reg); | |
1823 | ||
1824 | /* Generation of zero is invalid */ | |
1825 | do { | |
1826 | get_random_bytes(®->hr_generation, | |
1827 | sizeof(reg->hr_generation)); | |
1828 | } while (reg->hr_generation == 0); | |
1829 | ||
1830 | ret = o2hb_map_slot_data(reg); | |
1831 | if (ret) { | |
1832 | mlog_errno(ret); | |
2903ff01 | 1833 | goto out3; |
a7f6a5fb MF |
1834 | } |
1835 | ||
1836 | ret = o2hb_populate_slot_data(reg); | |
1837 | if (ret) { | |
1838 | mlog_errno(ret); | |
2903ff01 | 1839 | goto out3; |
a7f6a5fb MF |
1840 | } |
1841 | ||
c4028958 | 1842 | INIT_DELAYED_WORK(®->hr_write_timeout_work, o2hb_write_timeout); |
e0cbb798 | 1843 | INIT_DELAYED_WORK(®->hr_nego_timeout_work, o2hb_nego_timeout); |
a7f6a5fb MF |
1844 | |
1845 | /* | |
1846 | * A node is considered live after it has beat LIVE_THRESHOLD | |
1847 | * times. We're not steady until we've given them a chance | |
1848 | * _after_ our first read. | |
76d9fc29 SM |
1849 | * The default threshold is bare minimum so as to limit the delay |
1850 | * during mounts. For global heartbeat, the threshold doubled for the | |
1851 | * first region. | |
a7f6a5fb | 1852 | */ |
76d9fc29 SM |
1853 | live_threshold = O2HB_LIVE_THRESHOLD; |
1854 | if (o2hb_global_heartbeat_active()) { | |
1855 | spin_lock(&o2hb_live_lock); | |
a8f70de3 | 1856 | if (bitmap_weight(o2hb_region_bitmap, O2NM_MAX_REGIONS) == 1) |
76d9fc29 SM |
1857 | live_threshold <<= 1; |
1858 | spin_unlock(&o2hb_live_lock); | |
1859 | } | |
d2eece37 SM |
1860 | ++live_threshold; |
1861 | atomic_set(®->hr_steady_iterations, live_threshold); | |
a84ac334 JB |
1862 | /* unsteady_iterations is triple the steady_iterations */ |
1863 | atomic_set(®->hr_unsteady_iterations, (live_threshold * 3)); | |
a7f6a5fb | 1864 | |
e6c352db JB |
1865 | hb_task = kthread_run(o2hb_thread, reg, "o2hb-%s", |
1866 | reg->hr_item.ci_name); | |
1867 | if (IS_ERR(hb_task)) { | |
1868 | ret = PTR_ERR(hb_task); | |
a7f6a5fb | 1869 | mlog_errno(ret); |
2903ff01 | 1870 | goto out3; |
a7f6a5fb MF |
1871 | } |
1872 | ||
e6c352db JB |
1873 | spin_lock(&o2hb_live_lock); |
1874 | reg->hr_task = hb_task; | |
1875 | spin_unlock(&o2hb_live_lock); | |
1876 | ||
a7f6a5fb | 1877 | ret = wait_event_interruptible(o2hb_steady_queue, |
0986fe9b JQ |
1878 | atomic_read(®->hr_steady_iterations) == 0 || |
1879 | reg->hr_node_deleted); | |
a7f6a5fb | 1880 | if (ret) { |
d2eece37 SM |
1881 | atomic_set(®->hr_steady_iterations, 0); |
1882 | reg->hr_aborted_start = 1; | |
1883 | } | |
e6c352db | 1884 | |
d2eece37 SM |
1885 | if (reg->hr_aborted_start) { |
1886 | ret = -EIO; | |
2903ff01 | 1887 | goto out3; |
a7f6a5fb MF |
1888 | } |
1889 | ||
0986fe9b JQ |
1890 | if (reg->hr_node_deleted) { |
1891 | ret = -EINVAL; | |
1892 | goto out3; | |
1893 | } | |
1894 | ||
e6df3a66 JB |
1895 | /* Ok, we were woken. Make sure it wasn't by drop_item() */ |
1896 | spin_lock(&o2hb_live_lock); | |
1897 | hb_task = reg->hr_task; | |
e7d656ba SM |
1898 | if (o2hb_global_heartbeat_active()) |
1899 | set_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
e6df3a66 JB |
1900 | spin_unlock(&o2hb_live_lock); |
1901 | ||
1902 | if (hb_task) | |
1903 | ret = count; | |
1904 | else | |
1905 | ret = -EIO; | |
1906 | ||
18c50cb0 | 1907 | if (hb_task && o2hb_global_heartbeat_active()) |
d2eece37 SM |
1908 | printk(KERN_NOTICE "o2hb: Heartbeat started on region %s (%s)\n", |
1909 | config_item_name(®->hr_item), reg->hr_dev_name); | |
18c50cb0 | 1910 | |
2903ff01 AV |
1911 | out3: |
1912 | iput(inode); | |
1913 | out2: | |
1914 | fdput(f); | |
a7f6a5fb | 1915 | out: |
a7f6a5fb MF |
1916 | if (ret < 0) { |
1917 | if (reg->hr_bdev) { | |
9a1c3542 | 1918 | blkdev_put(reg->hr_bdev, FMODE_READ|FMODE_WRITE); |
a7f6a5fb MF |
1919 | reg->hr_bdev = NULL; |
1920 | } | |
1921 | } | |
1922 | return ret; | |
1923 | } | |
1924 | ||
45b99773 | 1925 | static ssize_t o2hb_region_pid_show(struct config_item *item, char *page) |
92efc152 | 1926 | { |
45b99773 | 1927 | struct o2hb_region *reg = to_o2hb_region(item); |
e6c352db JB |
1928 | pid_t pid = 0; |
1929 | ||
1930 | spin_lock(&o2hb_live_lock); | |
1931 | if (reg->hr_task) | |
ba25f9dc | 1932 | pid = task_pid_nr(reg->hr_task); |
e6c352db JB |
1933 | spin_unlock(&o2hb_live_lock); |
1934 | ||
1935 | if (!pid) | |
92efc152 ZW |
1936 | return 0; |
1937 | ||
e6c352db | 1938 | return sprintf(page, "%u\n", pid); |
92efc152 ZW |
1939 | } |
1940 | ||
45b99773 CH |
1941 | CONFIGFS_ATTR(o2hb_region_, block_bytes); |
1942 | CONFIGFS_ATTR(o2hb_region_, start_block); | |
1943 | CONFIGFS_ATTR(o2hb_region_, blocks); | |
1944 | CONFIGFS_ATTR(o2hb_region_, dev); | |
1945 | CONFIGFS_ATTR_RO(o2hb_region_, pid); | |
92efc152 | 1946 | |
a7f6a5fb | 1947 | static struct configfs_attribute *o2hb_region_attrs[] = { |
45b99773 CH |
1948 | &o2hb_region_attr_block_bytes, |
1949 | &o2hb_region_attr_start_block, | |
1950 | &o2hb_region_attr_blocks, | |
1951 | &o2hb_region_attr_dev, | |
1952 | &o2hb_region_attr_pid, | |
a7f6a5fb MF |
1953 | NULL, |
1954 | }; | |
1955 | ||
a7f6a5fb MF |
1956 | static struct configfs_item_operations o2hb_region_item_ops = { |
1957 | .release = o2hb_region_release, | |
a7f6a5fb MF |
1958 | }; |
1959 | ||
4843afe4 | 1960 | static const struct config_item_type o2hb_region_type = { |
a7f6a5fb MF |
1961 | .ct_item_ops = &o2hb_region_item_ops, |
1962 | .ct_attrs = o2hb_region_attrs, | |
1963 | .ct_owner = THIS_MODULE, | |
1964 | }; | |
1965 | ||
1966 | /* heartbeat set */ | |
1967 | ||
1968 | struct o2hb_heartbeat_group { | |
1969 | struct config_group hs_group; | |
1970 | /* some stuff? */ | |
1971 | }; | |
1972 | ||
1973 | static struct o2hb_heartbeat_group *to_o2hb_heartbeat_group(struct config_group *group) | |
1974 | { | |
1975 | return group ? | |
1976 | container_of(group, struct o2hb_heartbeat_group, hs_group) | |
1977 | : NULL; | |
1978 | } | |
1979 | ||
5e7a3ed9 GKH |
1980 | static void o2hb_debug_region_init(struct o2hb_region *reg, |
1981 | struct dentry *parent) | |
1f285305 | 1982 | { |
5e7a3ed9 | 1983 | struct dentry *dir; |
1f285305 | 1984 | |
5e7a3ed9 GKH |
1985 | dir = debugfs_create_dir(config_item_name(®->hr_item), parent); |
1986 | reg->hr_debug_dir = dir; | |
1f285305 | 1987 | |
5e7a3ed9 GKH |
1988 | o2hb_debug_create(O2HB_DEBUG_LIVENODES, dir, &(reg->hr_db_livenodes), |
1989 | sizeof(*(reg->hr_db_livenodes)), | |
1990 | O2HB_DB_TYPE_REGION_LIVENODES, | |
1991 | sizeof(reg->hr_live_node_bitmap), O2NM_MAX_NODES, | |
1992 | reg); | |
1f285305 | 1993 | |
5e7a3ed9 GKH |
1994 | o2hb_debug_create(O2HB_DEBUG_REGION_NUMBER, dir, &(reg->hr_db_regnum), |
1995 | sizeof(*(reg->hr_db_regnum)), | |
1996 | O2HB_DB_TYPE_REGION_NUMBER, 0, O2NM_MAX_NODES, reg); | |
1f285305 | 1997 | |
5e7a3ed9 GKH |
1998 | o2hb_debug_create(O2HB_DEBUG_REGION_ELAPSED_TIME, dir, |
1999 | &(reg->hr_db_elapsed_time), | |
2000 | sizeof(*(reg->hr_db_elapsed_time)), | |
2001 | O2HB_DB_TYPE_REGION_ELAPSED_TIME, 0, 0, reg); | |
43695d09 | 2002 | |
5e7a3ed9 GKH |
2003 | o2hb_debug_create(O2HB_DEBUG_REGION_PINNED, dir, &(reg->hr_db_pinned), |
2004 | sizeof(*(reg->hr_db_pinned)), | |
2005 | O2HB_DB_TYPE_REGION_PINNED, 0, 0, reg); | |
cb0586bd | 2006 | |
1f285305 SM |
2007 | } |
2008 | ||
f89ab861 JB |
2009 | static struct config_item *o2hb_heartbeat_group_make_item(struct config_group *group, |
2010 | const char *name) | |
a7f6a5fb MF |
2011 | { |
2012 | struct o2hb_region *reg = NULL; | |
1f285305 | 2013 | int ret; |
a7f6a5fb | 2014 | |
cd861280 | 2015 | reg = kzalloc(sizeof(struct o2hb_region), GFP_KERNEL); |
f89ab861 | 2016 | if (reg == NULL) |
a6795e9e | 2017 | return ERR_PTR(-ENOMEM); |
a7f6a5fb | 2018 | |
1cf257f5 JS |
2019 | if (strlen(name) > O2HB_MAX_REGION_NAME_LEN) { |
2020 | ret = -ENAMETOOLONG; | |
2021 | goto free; | |
2022 | } | |
b3c85c4c | 2023 | |
a7f6a5fb | 2024 | spin_lock(&o2hb_live_lock); |
536f0741 SM |
2025 | reg->hr_region_num = 0; |
2026 | if (o2hb_global_heartbeat_active()) { | |
2027 | reg->hr_region_num = find_first_zero_bit(o2hb_region_bitmap, | |
2028 | O2NM_MAX_REGIONS); | |
2029 | if (reg->hr_region_num >= O2NM_MAX_REGIONS) { | |
2030 | spin_unlock(&o2hb_live_lock); | |
1cf257f5 JS |
2031 | ret = -EFBIG; |
2032 | goto free; | |
536f0741 SM |
2033 | } |
2034 | set_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2035 | } | |
a7f6a5fb MF |
2036 | list_add_tail(®->hr_all_item, &o2hb_all_regions); |
2037 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb | 2038 | |
536f0741 SM |
2039 | config_item_init_type_name(®->hr_item, name, &o2hb_region_type); |
2040 | ||
34069b88 JB |
2041 | /* this is the same way to generate msg key as dlm, for local heartbeat, |
2042 | * name is also the same, so make initial crc value different to avoid | |
2043 | * message key conflict. | |
2044 | */ | |
2045 | reg->hr_key = crc32_le(reg->hr_region_num + O2NM_MAX_REGIONS, | |
2046 | name, strlen(name)); | |
2047 | INIT_LIST_HEAD(®->hr_handler_list); | |
2048 | ret = o2net_register_handler(O2HB_NEGO_TIMEOUT_MSG, reg->hr_key, | |
2049 | sizeof(struct o2hb_nego_msg), | |
2050 | o2hb_nego_timeout_handler, | |
2051 | reg, NULL, ®->hr_handler_list); | |
2052 | if (ret) | |
2053 | goto free; | |
2054 | ||
e76f8237 JB |
2055 | ret = o2net_register_handler(O2HB_NEGO_APPROVE_MSG, reg->hr_key, |
2056 | sizeof(struct o2hb_nego_msg), | |
2057 | o2hb_nego_approve_handler, | |
2058 | reg, NULL, ®->hr_handler_list); | |
2059 | if (ret) | |
2060 | goto unregister_handler; | |
2061 | ||
5e7a3ed9 | 2062 | o2hb_debug_region_init(reg, o2hb_debug_dir); |
1f285305 | 2063 | |
a6795e9e | 2064 | return ®->hr_item; |
34069b88 JB |
2065 | |
2066 | unregister_handler: | |
2067 | o2net_unregister_handler_list(®->hr_handler_list); | |
1cf257f5 JS |
2068 | free: |
2069 | kfree(reg); | |
2070 | return ERR_PTR(ret); | |
a7f6a5fb MF |
2071 | } |
2072 | ||
2073 | static void o2hb_heartbeat_group_drop_item(struct config_group *group, | |
2074 | struct config_item *item) | |
2075 | { | |
e6c352db | 2076 | struct task_struct *hb_task; |
a7f6a5fb | 2077 | struct o2hb_region *reg = to_o2hb_region(item); |
58a3158a | 2078 | int quorum_region = 0; |
a7f6a5fb MF |
2079 | |
2080 | /* stop the thread when the user removes the region dir */ | |
e6c352db JB |
2081 | spin_lock(&o2hb_live_lock); |
2082 | hb_task = reg->hr_task; | |
2083 | reg->hr_task = NULL; | |
58a3158a | 2084 | reg->hr_item_dropped = 1; |
e6c352db JB |
2085 | spin_unlock(&o2hb_live_lock); |
2086 | ||
2087 | if (hb_task) | |
2088 | kthread_stop(hb_task); | |
a7f6a5fb | 2089 | |
d2eece37 SM |
2090 | if (o2hb_global_heartbeat_active()) { |
2091 | spin_lock(&o2hb_live_lock); | |
2092 | clear_bit(reg->hr_region_num, o2hb_region_bitmap); | |
2093 | clear_bit(reg->hr_region_num, o2hb_live_region_bitmap); | |
2094 | if (test_bit(reg->hr_region_num, o2hb_quorum_region_bitmap)) | |
2095 | quorum_region = 1; | |
2096 | clear_bit(reg->hr_region_num, o2hb_quorum_region_bitmap); | |
2097 | spin_unlock(&o2hb_live_lock); | |
2098 | printk(KERN_NOTICE "o2hb: Heartbeat %s on region %s (%s)\n", | |
2099 | ((atomic_read(®->hr_steady_iterations) == 0) ? | |
2100 | "stopped" : "start aborted"), config_item_name(item), | |
2101 | reg->hr_dev_name); | |
2102 | } | |
2103 | ||
e6df3a66 JB |
2104 | /* |
2105 | * If we're racing a dev_write(), we need to wake them. They will | |
2106 | * check reg->hr_task | |
2107 | */ | |
2108 | if (atomic_read(®->hr_steady_iterations) != 0) { | |
d2eece37 | 2109 | reg->hr_aborted_start = 1; |
e6df3a66 JB |
2110 | atomic_set(®->hr_steady_iterations, 0); |
2111 | wake_up(&o2hb_steady_queue); | |
2112 | } | |
2113 | ||
a7f6a5fb | 2114 | config_item_put(item); |
58a3158a SM |
2115 | |
2116 | if (!o2hb_global_heartbeat_active() || !quorum_region) | |
2117 | return; | |
2118 | ||
2119 | /* | |
2120 | * If global heartbeat active and there are dependent users, | |
2121 | * pin all regions if quorum region count <= CUT_OFF | |
2122 | */ | |
2123 | spin_lock(&o2hb_live_lock); | |
2124 | ||
2125 | if (!o2hb_dependent_users) | |
2126 | goto unlock; | |
2127 | ||
a8f70de3 | 2128 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2129 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2130 | o2hb_region_pin(NULL); | |
2131 | ||
2132 | unlock: | |
2133 | spin_unlock(&o2hb_live_lock); | |
a7f6a5fb MF |
2134 | } |
2135 | ||
33496c3c | 2136 | static ssize_t o2hb_heartbeat_group_dead_threshold_show(struct config_item *item, |
45b99773 | 2137 | char *page) |
a7f6a5fb MF |
2138 | { |
2139 | return sprintf(page, "%u\n", o2hb_dead_threshold); | |
2140 | } | |
2141 | ||
33496c3c | 2142 | static ssize_t o2hb_heartbeat_group_dead_threshold_store(struct config_item *item, |
45b99773 | 2143 | const char *page, size_t count) |
a7f6a5fb MF |
2144 | { |
2145 | unsigned long tmp; | |
2146 | char *p = (char *)page; | |
2147 | ||
2148 | tmp = simple_strtoul(p, &p, 10); | |
2149 | if (!p || (*p && (*p != '\n'))) | |
2150 | return -EINVAL; | |
2151 | ||
2152 | /* this will validate ranges for us. */ | |
2153 | o2hb_dead_threshold_set((unsigned int) tmp); | |
2154 | ||
2155 | return count; | |
2156 | } | |
2157 | ||
45b99773 CH |
2158 | static ssize_t o2hb_heartbeat_group_mode_show(struct config_item *item, |
2159 | char *page) | |
54b5187b SM |
2160 | { |
2161 | return sprintf(page, "%s\n", | |
2162 | o2hb_heartbeat_mode_desc[o2hb_heartbeat_mode]); | |
2163 | } | |
2164 | ||
45b99773 CH |
2165 | static ssize_t o2hb_heartbeat_group_mode_store(struct config_item *item, |
2166 | const char *page, size_t count) | |
54b5187b SM |
2167 | { |
2168 | unsigned int i; | |
2169 | int ret; | |
2170 | size_t len; | |
2171 | ||
2172 | len = (page[count - 1] == '\n') ? count - 1 : count; | |
2173 | if (!len) | |
2174 | return -EINVAL; | |
2175 | ||
2176 | for (i = 0; i < O2HB_HEARTBEAT_NUM_MODES; ++i) { | |
2bd63329 | 2177 | if (strncasecmp(page, o2hb_heartbeat_mode_desc[i], len)) |
54b5187b SM |
2178 | continue; |
2179 | ||
70f651ed | 2180 | ret = o2hb_global_heartbeat_mode_set(i); |
54b5187b | 2181 | if (!ret) |
18c50cb0 | 2182 | printk(KERN_NOTICE "o2hb: Heartbeat mode set to %s\n", |
54b5187b SM |
2183 | o2hb_heartbeat_mode_desc[i]); |
2184 | return count; | |
2185 | } | |
2186 | ||
2187 | return -EINVAL; | |
2188 | ||
2189 | } | |
2190 | ||
33496c3c | 2191 | CONFIGFS_ATTR(o2hb_heartbeat_group_, dead_threshold); |
45b99773 | 2192 | CONFIGFS_ATTR(o2hb_heartbeat_group_, mode); |
54b5187b | 2193 | |
a7f6a5fb | 2194 | static struct configfs_attribute *o2hb_heartbeat_group_attrs[] = { |
33496c3c | 2195 | &o2hb_heartbeat_group_attr_dead_threshold, |
45b99773 | 2196 | &o2hb_heartbeat_group_attr_mode, |
a7f6a5fb MF |
2197 | NULL, |
2198 | }; | |
2199 | ||
a7f6a5fb MF |
2200 | static struct configfs_group_operations o2hb_heartbeat_group_group_ops = { |
2201 | .make_item = o2hb_heartbeat_group_make_item, | |
2202 | .drop_item = o2hb_heartbeat_group_drop_item, | |
2203 | }; | |
2204 | ||
4843afe4 | 2205 | static const struct config_item_type o2hb_heartbeat_group_type = { |
a7f6a5fb | 2206 | .ct_group_ops = &o2hb_heartbeat_group_group_ops, |
a7f6a5fb MF |
2207 | .ct_attrs = o2hb_heartbeat_group_attrs, |
2208 | .ct_owner = THIS_MODULE, | |
2209 | }; | |
2210 | ||
2211 | /* this is just here to avoid touching group in heartbeat.h which the | |
2212 | * entire damn world #includes */ | |
2213 | struct config_group *o2hb_alloc_hb_set(void) | |
2214 | { | |
2215 | struct o2hb_heartbeat_group *hs = NULL; | |
2216 | struct config_group *ret = NULL; | |
2217 | ||
cd861280 | 2218 | hs = kzalloc(sizeof(struct o2hb_heartbeat_group), GFP_KERNEL); |
a7f6a5fb MF |
2219 | if (hs == NULL) |
2220 | goto out; | |
2221 | ||
2222 | config_group_init_type_name(&hs->hs_group, "heartbeat", | |
2223 | &o2hb_heartbeat_group_type); | |
2224 | ||
2225 | ret = &hs->hs_group; | |
2226 | out: | |
2227 | if (ret == NULL) | |
2228 | kfree(hs); | |
2229 | return ret; | |
2230 | } | |
2231 | ||
2232 | void o2hb_free_hb_set(struct config_group *group) | |
2233 | { | |
2234 | struct o2hb_heartbeat_group *hs = to_o2hb_heartbeat_group(group); | |
2235 | kfree(hs); | |
2236 | } | |
2237 | ||
25985edc | 2238 | /* hb callback registration and issuing */ |
a7f6a5fb MF |
2239 | |
2240 | static struct o2hb_callback *hbcall_from_type(enum o2hb_callback_type type) | |
2241 | { | |
2242 | if (type == O2HB_NUM_CB) | |
2243 | return ERR_PTR(-EINVAL); | |
2244 | ||
2245 | return &o2hb_callbacks[type]; | |
2246 | } | |
2247 | ||
2248 | void o2hb_setup_callback(struct o2hb_callback_func *hc, | |
2249 | enum o2hb_callback_type type, | |
2250 | o2hb_cb_func *func, | |
2251 | void *data, | |
2252 | int priority) | |
2253 | { | |
2254 | INIT_LIST_HEAD(&hc->hc_item); | |
2255 | hc->hc_func = func; | |
2256 | hc->hc_data = data; | |
2257 | hc->hc_priority = priority; | |
2258 | hc->hc_type = type; | |
2259 | hc->hc_magic = O2HB_CB_MAGIC; | |
2260 | } | |
2261 | EXPORT_SYMBOL_GPL(o2hb_setup_callback); | |
2262 | ||
58a3158a SM |
2263 | /* |
2264 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2265 | * In global heartbeat mode, region_uuid passed is NULL. | |
2266 | * | |
2267 | * In local, we only pin the matching region. In global we pin all the active | |
2268 | * regions. | |
2269 | */ | |
2270 | static int o2hb_region_pin(const char *region_uuid) | |
14829422 | 2271 | { |
58a3158a SM |
2272 | int ret = 0, found = 0; |
2273 | struct o2hb_region *reg; | |
2274 | char *uuid; | |
14829422 JB |
2275 | |
2276 | assert_spin_locked(&o2hb_live_lock); | |
2277 | ||
58a3158a | 2278 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2279 | if (reg->hr_item_dropped) |
2280 | continue; | |
2281 | ||
58a3158a SM |
2282 | uuid = config_item_name(®->hr_item); |
2283 | ||
2284 | /* local heartbeat */ | |
2285 | if (region_uuid) { | |
2286 | if (strcmp(region_uuid, uuid)) | |
2287 | continue; | |
2288 | found = 1; | |
14829422 | 2289 | } |
58a3158a SM |
2290 | |
2291 | if (reg->hr_item_pinned || reg->hr_item_dropped) | |
2292 | goto skip_pin; | |
2293 | ||
2294 | /* Ignore ENOENT only for local hb (userdlm domain) */ | |
2295 | ret = o2nm_depend_item(®->hr_item); | |
2296 | if (!ret) { | |
2297 | mlog(ML_CLUSTER, "Pin region %s\n", uuid); | |
2298 | reg->hr_item_pinned = 1; | |
2299 | } else { | |
2300 | if (ret == -ENOENT && found) | |
2301 | ret = 0; | |
2302 | else { | |
2303 | mlog(ML_ERROR, "Pin region %s fails with %d\n", | |
2304 | uuid, ret); | |
2305 | break; | |
2306 | } | |
14829422 | 2307 | } |
58a3158a SM |
2308 | skip_pin: |
2309 | if (found) | |
2310 | break; | |
14829422 JB |
2311 | } |
2312 | ||
58a3158a | 2313 | return ret; |
14829422 JB |
2314 | } |
2315 | ||
58a3158a SM |
2316 | /* |
2317 | * In local heartbeat mode, region_uuid passed matches the dlm domain name. | |
2318 | * In global heartbeat mode, region_uuid passed is NULL. | |
2319 | * | |
2320 | * In local, we only unpin the matching region. In global we unpin all the | |
2321 | * active regions. | |
2322 | */ | |
2323 | static void o2hb_region_unpin(const char *region_uuid) | |
14829422 | 2324 | { |
14829422 | 2325 | struct o2hb_region *reg; |
58a3158a SM |
2326 | char *uuid; |
2327 | int found = 0; | |
14829422 | 2328 | |
58a3158a | 2329 | assert_spin_locked(&o2hb_live_lock); |
14829422 | 2330 | |
58a3158a | 2331 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { |
4a184b4f X |
2332 | if (reg->hr_item_dropped) |
2333 | continue; | |
2334 | ||
58a3158a SM |
2335 | uuid = config_item_name(®->hr_item); |
2336 | if (region_uuid) { | |
2337 | if (strcmp(region_uuid, uuid)) | |
2338 | continue; | |
2339 | found = 1; | |
2340 | } | |
14829422 | 2341 | |
58a3158a SM |
2342 | if (reg->hr_item_pinned) { |
2343 | mlog(ML_CLUSTER, "Unpin region %s\n", uuid); | |
2344 | o2nm_undepend_item(®->hr_item); | |
2345 | reg->hr_item_pinned = 0; | |
2346 | } | |
2347 | if (found) | |
2348 | break; | |
2349 | } | |
2350 | } | |
16c6a4f2 | 2351 | |
58a3158a SM |
2352 | static int o2hb_region_inc_user(const char *region_uuid) |
2353 | { | |
2354 | int ret = 0; | |
14829422 | 2355 | |
58a3158a | 2356 | spin_lock(&o2hb_live_lock); |
16c6a4f2 | 2357 | |
58a3158a SM |
2358 | /* local heartbeat */ |
2359 | if (!o2hb_global_heartbeat_active()) { | |
2360 | ret = o2hb_region_pin(region_uuid); | |
2361 | goto unlock; | |
2362 | } | |
2363 | ||
2364 | /* | |
2365 | * if global heartbeat active and this is the first dependent user, | |
2366 | * pin all regions if quorum region count <= CUT_OFF | |
2367 | */ | |
2368 | o2hb_dependent_users++; | |
2369 | if (o2hb_dependent_users > 1) | |
2370 | goto unlock; | |
2371 | ||
a8f70de3 | 2372 | if (bitmap_weight(o2hb_quorum_region_bitmap, |
58a3158a SM |
2373 | O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) |
2374 | ret = o2hb_region_pin(NULL); | |
2375 | ||
2376 | unlock: | |
2377 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2378 | return ret; |
2379 | } | |
2380 | ||
480bd564 | 2381 | static void o2hb_region_dec_user(const char *region_uuid) |
14829422 | 2382 | { |
14829422 JB |
2383 | spin_lock(&o2hb_live_lock); |
2384 | ||
58a3158a SM |
2385 | /* local heartbeat */ |
2386 | if (!o2hb_global_heartbeat_active()) { | |
2387 | o2hb_region_unpin(region_uuid); | |
2388 | goto unlock; | |
2389 | } | |
14829422 | 2390 | |
58a3158a SM |
2391 | /* |
2392 | * if global heartbeat active and there are no dependent users, | |
2393 | * unpin all quorum regions | |
2394 | */ | |
2395 | o2hb_dependent_users--; | |
2396 | if (!o2hb_dependent_users) | |
2397 | o2hb_region_unpin(NULL); | |
14829422 | 2398 | |
58a3158a SM |
2399 | unlock: |
2400 | spin_unlock(&o2hb_live_lock); | |
14829422 JB |
2401 | } |
2402 | ||
2403 | int o2hb_register_callback(const char *region_uuid, | |
2404 | struct o2hb_callback_func *hc) | |
a7f6a5fb | 2405 | { |
df53cd3b | 2406 | struct o2hb_callback_func *f; |
a7f6a5fb MF |
2407 | struct o2hb_callback *hbcall; |
2408 | int ret; | |
2409 | ||
2410 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2411 | BUG_ON(!list_empty(&hc->hc_item)); | |
2412 | ||
2413 | hbcall = hbcall_from_type(hc->hc_type); | |
2414 | if (IS_ERR(hbcall)) { | |
2415 | ret = PTR_ERR(hbcall); | |
2416 | goto out; | |
2417 | } | |
2418 | ||
14829422 | 2419 | if (region_uuid) { |
58a3158a SM |
2420 | ret = o2hb_region_inc_user(region_uuid); |
2421 | if (ret) { | |
2422 | mlog_errno(ret); | |
14829422 | 2423 | goto out; |
58a3158a | 2424 | } |
14829422 JB |
2425 | } |
2426 | ||
a7f6a5fb MF |
2427 | down_write(&o2hb_callback_sem); |
2428 | ||
df53cd3b DF |
2429 | list_for_each_entry(f, &hbcall->list, hc_item) { |
2430 | if (hc->hc_priority < f->hc_priority) { | |
2431 | list_add_tail(&hc->hc_item, &f->hc_item); | |
a7f6a5fb MF |
2432 | break; |
2433 | } | |
2434 | } | |
2435 | if (list_empty(&hc->hc_item)) | |
2436 | list_add_tail(&hc->hc_item, &hbcall->list); | |
2437 | ||
2438 | up_write(&o2hb_callback_sem); | |
2439 | ret = 0; | |
2440 | out: | |
58a3158a | 2441 | mlog(ML_CLUSTER, "returning %d on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2442 | ret, __builtin_return_address(0), hc); |
2443 | return ret; | |
2444 | } | |
2445 | EXPORT_SYMBOL_GPL(o2hb_register_callback); | |
2446 | ||
14829422 JB |
2447 | void o2hb_unregister_callback(const char *region_uuid, |
2448 | struct o2hb_callback_func *hc) | |
a7f6a5fb MF |
2449 | { |
2450 | BUG_ON(hc->hc_magic != O2HB_CB_MAGIC); | |
2451 | ||
58a3158a | 2452 | mlog(ML_CLUSTER, "on behalf of %p for funcs %p\n", |
a7f6a5fb MF |
2453 | __builtin_return_address(0), hc); |
2454 | ||
14829422 | 2455 | /* XXX Can this happen _with_ a region reference? */ |
a7f6a5fb | 2456 | if (list_empty(&hc->hc_item)) |
c24f72cc | 2457 | return; |
a7f6a5fb | 2458 | |
14829422 | 2459 | if (region_uuid) |
58a3158a | 2460 | o2hb_region_dec_user(region_uuid); |
14829422 | 2461 | |
a7f6a5fb MF |
2462 | down_write(&o2hb_callback_sem); |
2463 | ||
2464 | list_del_init(&hc->hc_item); | |
2465 | ||
2466 | up_write(&o2hb_callback_sem); | |
a7f6a5fb MF |
2467 | } |
2468 | EXPORT_SYMBOL_GPL(o2hb_unregister_callback); | |
2469 | ||
70e82a12 JQ |
2470 | int o2hb_check_node_heartbeating_no_sem(u8 node_num) |
2471 | { | |
2472 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
70e82a12 | 2473 | |
4d548f61 | 2474 | spin_lock(&o2hb_live_lock); |
70e82a12 | 2475 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); |
4d548f61 | 2476 | spin_unlock(&o2hb_live_lock); |
70e82a12 JQ |
2477 | if (!test_bit(node_num, testing_map)) { |
2478 | mlog(ML_HEARTBEAT, | |
2479 | "node (%u) does not have heartbeating enabled.\n", | |
2480 | node_num); | |
2481 | return 0; | |
2482 | } | |
2483 | ||
2484 | return 1; | |
2485 | } | |
2486 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_no_sem); | |
2487 | ||
a7f6a5fb MF |
2488 | int o2hb_check_node_heartbeating_from_callback(u8 node_num) |
2489 | { | |
2490 | unsigned long testing_map[BITS_TO_LONGS(O2NM_MAX_NODES)]; | |
2491 | ||
2492 | o2hb_fill_node_map_from_callback(testing_map, sizeof(testing_map)); | |
2493 | if (!test_bit(node_num, testing_map)) { | |
2494 | mlog(ML_HEARTBEAT, | |
2495 | "node (%u) does not have heartbeating enabled.\n", | |
2496 | node_num); | |
2497 | return 0; | |
2498 | } | |
2499 | ||
2500 | return 1; | |
2501 | } | |
2502 | EXPORT_SYMBOL_GPL(o2hb_check_node_heartbeating_from_callback); | |
2503 | ||
a7f6a5fb MF |
2504 | /* |
2505 | * this is just a hack until we get the plumbing which flips file systems | |
2506 | * read only and drops the hb ref instead of killing the node dead. | |
2507 | */ | |
2508 | void o2hb_stop_all_regions(void) | |
2509 | { | |
2510 | struct o2hb_region *reg; | |
2511 | ||
2512 | mlog(ML_ERROR, "stopping heartbeat on all active regions.\n"); | |
2513 | ||
2514 | spin_lock(&o2hb_live_lock); | |
2515 | ||
2516 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) | |
2517 | reg->hr_unclean_stop = 1; | |
2518 | ||
2519 | spin_unlock(&o2hb_live_lock); | |
2520 | } | |
2521 | EXPORT_SYMBOL_GPL(o2hb_stop_all_regions); | |
b3c85c4c SM |
2522 | |
2523 | int o2hb_get_all_regions(char *region_uuids, u8 max_regions) | |
2524 | { | |
2525 | struct o2hb_region *reg; | |
2526 | int numregs = 0; | |
2527 | char *p; | |
2528 | ||
2529 | spin_lock(&o2hb_live_lock); | |
2530 | ||
2531 | p = region_uuids; | |
2532 | list_for_each_entry(reg, &o2hb_all_regions, hr_all_item) { | |
4a184b4f X |
2533 | if (reg->hr_item_dropped) |
2534 | continue; | |
2535 | ||
b3c85c4c SM |
2536 | mlog(0, "Region: %s\n", config_item_name(®->hr_item)); |
2537 | if (numregs < max_regions) { | |
2538 | memcpy(p, config_item_name(®->hr_item), | |
2539 | O2HB_MAX_REGION_NAME_LEN); | |
2540 | p += O2HB_MAX_REGION_NAME_LEN; | |
2541 | } | |
2542 | numregs++; | |
2543 | } | |
2544 | ||
2545 | spin_unlock(&o2hb_live_lock); | |
2546 | ||
2547 | return numregs; | |
2548 | } | |
2549 | EXPORT_SYMBOL_GPL(o2hb_get_all_regions); | |
2550 | ||
2551 | int o2hb_global_heartbeat_active(void) | |
2552 | { | |
4d94aa1b | 2553 | return (o2hb_heartbeat_mode == O2HB_HEARTBEAT_GLOBAL); |
b3c85c4c SM |
2554 | } |
2555 | EXPORT_SYMBOL(o2hb_global_heartbeat_active); |