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ccd979bd MF |
1 | /* -*- mode: c; c-basic-offset: 8; -*- |
2 | * vim: noexpandtab sw=8 ts=8 sts=0: | |
3 | * | |
4 | * vote.c | |
5 | * | |
6 | * description here | |
7 | * | |
8 | * Copyright (C) 2003, 2004 Oracle. All rights reserved. | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public | |
12 | * License as published by the Free Software Foundation; either | |
13 | * version 2 of the License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public | |
21 | * License along with this program; if not, write to the | |
22 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | * Boston, MA 021110-1307, USA. | |
24 | */ | |
25 | ||
26 | #include <linux/types.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/highmem.h> | |
29 | #include <linux/smp_lock.h> | |
30 | #include <linux/kthread.h> | |
31 | ||
32 | #include <cluster/heartbeat.h> | |
33 | #include <cluster/nodemanager.h> | |
34 | #include <cluster/tcp.h> | |
35 | ||
36 | #include <dlm/dlmapi.h> | |
37 | ||
38 | #define MLOG_MASK_PREFIX ML_VOTE | |
39 | #include <cluster/masklog.h> | |
40 | ||
41 | #include "ocfs2.h" | |
42 | ||
43 | #include "alloc.h" | |
44 | #include "dlmglue.h" | |
45 | #include "extent_map.h" | |
46 | #include "heartbeat.h" | |
47 | #include "inode.h" | |
48 | #include "journal.h" | |
49 | #include "slot_map.h" | |
50 | #include "vote.h" | |
51 | ||
52 | #include "buffer_head_io.h" | |
53 | ||
54 | #define OCFS2_MESSAGE_TYPE_VOTE (0x1) | |
55 | #define OCFS2_MESSAGE_TYPE_RESPONSE (0x2) | |
56 | struct ocfs2_msg_hdr | |
57 | { | |
58 | __be32 h_response_id; /* used to lookup message handle on sending | |
59 | * node. */ | |
60 | __be32 h_request; | |
61 | __be64 h_blkno; | |
62 | __be32 h_generation; | |
63 | __be32 h_node_num; /* node sending this particular message. */ | |
64 | }; | |
65 | ||
66 | /* OCFS2_MAX_FILENAME_LEN is 255 characters, but we want to align this | |
67 | * for the network. */ | |
68 | #define OCFS2_VOTE_FILENAME_LEN 256 | |
69 | struct ocfs2_vote_msg | |
70 | { | |
71 | struct ocfs2_msg_hdr v_hdr; | |
72 | union { | |
73 | __be32 v_generic1; | |
74 | __be32 v_orphaned_slot; /* Used during delete votes */ | |
75 | __be32 v_nlink; /* Used during unlink votes */ | |
76 | } md1; /* Message type dependant 1 */ | |
ccd979bd MF |
77 | }; |
78 | ||
79 | /* Responses are given these values to maintain backwards | |
80 | * compatibility with older ocfs2 versions */ | |
81 | #define OCFS2_RESPONSE_OK (0) | |
82 | #define OCFS2_RESPONSE_BUSY (-16) | |
83 | #define OCFS2_RESPONSE_BAD_MSG (-22) | |
84 | ||
85 | struct ocfs2_response_msg | |
86 | { | |
87 | struct ocfs2_msg_hdr r_hdr; | |
88 | __be32 r_response; | |
89 | __be32 r_orphaned_slot; | |
90 | }; | |
91 | ||
92 | struct ocfs2_vote_work { | |
93 | struct list_head w_list; | |
94 | struct ocfs2_vote_msg w_msg; | |
95 | }; | |
96 | ||
97 | enum ocfs2_vote_request { | |
98 | OCFS2_VOTE_REQ_INVALID = 0, | |
99 | OCFS2_VOTE_REQ_DELETE, | |
ccd979bd MF |
100 | OCFS2_VOTE_REQ_MOUNT, |
101 | OCFS2_VOTE_REQ_UMOUNT, | |
102 | OCFS2_VOTE_REQ_LAST | |
103 | }; | |
104 | ||
105 | static inline int ocfs2_is_valid_vote_request(int request) | |
106 | { | |
107 | return OCFS2_VOTE_REQ_INVALID < request && | |
108 | request < OCFS2_VOTE_REQ_LAST; | |
109 | } | |
110 | ||
111 | typedef void (*ocfs2_net_response_callback)(void *priv, | |
112 | struct ocfs2_response_msg *resp); | |
113 | struct ocfs2_net_response_cb { | |
114 | ocfs2_net_response_callback rc_cb; | |
115 | void *rc_priv; | |
116 | }; | |
117 | ||
118 | struct ocfs2_net_wait_ctxt { | |
119 | struct list_head n_list; | |
120 | u32 n_response_id; | |
121 | wait_queue_head_t n_event; | |
122 | struct ocfs2_node_map n_node_map; | |
123 | int n_response; /* an agreggate response. 0 if | |
124 | * all nodes are go, < 0 on any | |
125 | * negative response from any | |
126 | * node or network error. */ | |
127 | struct ocfs2_net_response_cb *n_callback; | |
128 | }; | |
129 | ||
130 | static void ocfs2_process_mount_request(struct ocfs2_super *osb, | |
131 | unsigned int node_num) | |
132 | { | |
133 | mlog(0, "MOUNT vote from node %u\n", node_num); | |
134 | /* The other node only sends us this message when he has an EX | |
135 | * on the superblock, so our recovery threads (if having been | |
136 | * launched) are waiting on it.*/ | |
137 | ocfs2_recovery_map_clear(osb, node_num); | |
138 | ocfs2_node_map_set_bit(osb, &osb->mounted_map, node_num); | |
139 | ||
140 | /* We clear the umount map here because a node may have been | |
141 | * previously mounted, safely unmounted but never stopped | |
142 | * heartbeating - in which case we'd have a stale entry. */ | |
143 | ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num); | |
144 | } | |
145 | ||
146 | static void ocfs2_process_umount_request(struct ocfs2_super *osb, | |
147 | unsigned int node_num) | |
148 | { | |
149 | mlog(0, "UMOUNT vote from node %u\n", node_num); | |
150 | ocfs2_node_map_clear_bit(osb, &osb->mounted_map, node_num); | |
151 | ocfs2_node_map_set_bit(osb, &osb->umount_map, node_num); | |
152 | } | |
153 | ||
154 | void ocfs2_mark_inode_remotely_deleted(struct inode *inode) | |
155 | { | |
156 | struct ocfs2_inode_info *oi = OCFS2_I(inode); | |
157 | ||
158 | assert_spin_locked(&oi->ip_lock); | |
159 | /* We set the SKIP_DELETE flag on the inode so we don't try to | |
160 | * delete it in delete_inode ourselves, thus avoiding | |
161 | * unecessary lock pinging. If the other node failed to wipe | |
162 | * the inode as a result of a crash, then recovery will pick | |
163 | * up the slack. */ | |
164 | oi->ip_flags |= OCFS2_INODE_DELETED|OCFS2_INODE_SKIP_DELETE; | |
165 | } | |
166 | ||
167 | static int ocfs2_process_delete_request(struct inode *inode, | |
168 | int *orphaned_slot) | |
169 | { | |
170 | int response = OCFS2_RESPONSE_BUSY; | |
171 | ||
172 | mlog(0, "DELETE vote on inode %lu, read lnk_cnt = %u, slot = %d\n", | |
173 | inode->i_ino, inode->i_nlink, *orphaned_slot); | |
174 | ||
175 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
176 | ||
177 | /* Whatever our vote response is, we want to make sure that | |
178 | * the orphaned slot is recorded properly on this node *and* | |
179 | * on the requesting node. Technically, if the requesting node | |
180 | * did not know which slot the inode is orphaned in but we | |
181 | * respond with BUSY he doesn't actually need the orphaned | |
182 | * slot, but it doesn't hurt to do it here anyway. */ | |
183 | if ((*orphaned_slot) != OCFS2_INVALID_SLOT) { | |
184 | mlog_bug_on_msg(OCFS2_I(inode)->ip_orphaned_slot != | |
185 | OCFS2_INVALID_SLOT && | |
186 | OCFS2_I(inode)->ip_orphaned_slot != | |
187 | (*orphaned_slot), | |
b0697053 | 188 | "Inode %llu: This node thinks it's " |
ccd979bd | 189 | "orphaned in slot %d, messaged it's in %d\n", |
b0697053 | 190 | (unsigned long long)OCFS2_I(inode)->ip_blkno, |
ccd979bd MF |
191 | OCFS2_I(inode)->ip_orphaned_slot, |
192 | *orphaned_slot); | |
193 | ||
b0697053 MF |
194 | mlog(0, "Setting orphaned slot for inode %llu to %d\n", |
195 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
196 | *orphaned_slot); | |
ccd979bd MF |
197 | |
198 | OCFS2_I(inode)->ip_orphaned_slot = *orphaned_slot; | |
199 | } else { | |
b0697053 | 200 | mlog(0, "Sending back orphaned slot %d for inode %llu\n", |
ccd979bd | 201 | OCFS2_I(inode)->ip_orphaned_slot, |
b0697053 | 202 | (unsigned long long)OCFS2_I(inode)->ip_blkno); |
ccd979bd MF |
203 | |
204 | *orphaned_slot = OCFS2_I(inode)->ip_orphaned_slot; | |
205 | } | |
206 | ||
207 | /* vote no if the file is still open. */ | |
208 | if (OCFS2_I(inode)->ip_open_count) { | |
209 | mlog(0, "open count = %u\n", | |
210 | OCFS2_I(inode)->ip_open_count); | |
211 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
212 | goto done; | |
213 | } | |
214 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
215 | ||
216 | /* directories are a bit ugly... What if someone is sitting in | |
217 | * it? We want to make sure the inode is removed completely as | |
218 | * a result of the iput in process_vote. */ | |
219 | if (S_ISDIR(inode->i_mode) && (atomic_read(&inode->i_count) != 1)) { | |
220 | mlog(0, "i_count = %u\n", atomic_read(&inode->i_count)); | |
221 | goto done; | |
222 | } | |
223 | ||
224 | if (filemap_fdatawrite(inode->i_mapping)) { | |
b0697053 MF |
225 | mlog(ML_ERROR, "Could not sync inode %llu for delete!\n", |
226 | (unsigned long long)OCFS2_I(inode)->ip_blkno); | |
ccd979bd MF |
227 | goto done; |
228 | } | |
229 | sync_mapping_buffers(inode->i_mapping); | |
230 | truncate_inode_pages(inode->i_mapping, 0); | |
231 | ocfs2_extent_map_trunc(inode, 0); | |
232 | ||
233 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
234 | /* double check open count - someone might have raced this | |
235 | * thread into ocfs2_file_open while we were writing out | |
236 | * data. If we're to allow a wipe of this inode now, we *must* | |
237 | * hold the spinlock until we've marked it. */ | |
238 | if (OCFS2_I(inode)->ip_open_count) { | |
239 | mlog(0, "Raced to wipe! open count = %u\n", | |
240 | OCFS2_I(inode)->ip_open_count); | |
241 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
242 | goto done; | |
243 | } | |
244 | ||
245 | /* Mark the inode as being wiped from disk. */ | |
246 | ocfs2_mark_inode_remotely_deleted(inode); | |
247 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
248 | ||
249 | /* Not sure this is necessary anymore. */ | |
250 | d_prune_aliases(inode); | |
251 | ||
252 | /* If we get here, then we're voting 'yes', so commit the | |
253 | * delete on our side. */ | |
254 | response = OCFS2_RESPONSE_OK; | |
255 | done: | |
256 | return response; | |
257 | } | |
258 | ||
ccd979bd MF |
259 | static void ocfs2_process_vote(struct ocfs2_super *osb, |
260 | struct ocfs2_vote_msg *msg) | |
261 | { | |
262 | int net_status, vote_response; | |
263 | int orphaned_slot = 0; | |
1390334b MF |
264 | unsigned int node_num, generation; |
265 | u64 blkno; | |
ccd979bd MF |
266 | enum ocfs2_vote_request request; |
267 | struct inode *inode = NULL; | |
268 | struct ocfs2_msg_hdr *hdr = &msg->v_hdr; | |
269 | struct ocfs2_response_msg response; | |
270 | ||
271 | /* decode the network mumbo jumbo into local variables. */ | |
272 | request = be32_to_cpu(hdr->h_request); | |
273 | blkno = be64_to_cpu(hdr->h_blkno); | |
274 | generation = be32_to_cpu(hdr->h_generation); | |
275 | node_num = be32_to_cpu(hdr->h_node_num); | |
276 | if (request == OCFS2_VOTE_REQ_DELETE) | |
277 | orphaned_slot = be32_to_cpu(msg->md1.v_orphaned_slot); | |
278 | ||
b0697053 | 279 | mlog(0, "processing vote: request = %u, blkno = %llu, " |
ccd979bd | 280 | "generation = %u, node_num = %u, priv1 = %u\n", request, |
b0697053 MF |
281 | (unsigned long long)blkno, generation, node_num, |
282 | be32_to_cpu(msg->md1.v_generic1)); | |
ccd979bd MF |
283 | |
284 | if (!ocfs2_is_valid_vote_request(request)) { | |
285 | mlog(ML_ERROR, "Invalid vote request %d from node %u\n", | |
286 | request, node_num); | |
287 | vote_response = OCFS2_RESPONSE_BAD_MSG; | |
288 | goto respond; | |
289 | } | |
290 | ||
291 | vote_response = OCFS2_RESPONSE_OK; | |
292 | ||
293 | switch (request) { | |
294 | case OCFS2_VOTE_REQ_UMOUNT: | |
295 | ocfs2_process_umount_request(osb, node_num); | |
296 | goto respond; | |
297 | case OCFS2_VOTE_REQ_MOUNT: | |
298 | ocfs2_process_mount_request(osb, node_num); | |
299 | goto respond; | |
300 | default: | |
301 | /* avoids a gcc warning */ | |
302 | break; | |
303 | } | |
304 | ||
305 | /* We cannot process the remaining message types before we're | |
306 | * fully mounted. It's perfectly safe however to send a 'yes' | |
307 | * response as we can't possibly have any of the state they're | |
308 | * asking us to modify yet. */ | |
309 | if (atomic_read(&osb->vol_state) == VOLUME_INIT) | |
310 | goto respond; | |
311 | ||
312 | /* If we get here, then the request is against an inode. */ | |
313 | inode = ocfs2_ilookup_for_vote(osb, blkno, | |
314 | request == OCFS2_VOTE_REQ_DELETE); | |
315 | ||
316 | /* Not finding the inode is perfectly valid - it means we're | |
317 | * not interested in what the other node is about to do to it | |
318 | * so in those cases we automatically respond with an | |
319 | * affirmative. Cluster locking ensures that we won't race | |
320 | * interest in the inode with this vote request. */ | |
321 | if (!inode) | |
322 | goto respond; | |
323 | ||
324 | /* Check generation values. It's possible for us to get a | |
325 | * request against a stale inode. If so then we proceed as if | |
326 | * we had not found an inode in the first place. */ | |
327 | if (inode->i_generation != generation) { | |
328 | mlog(0, "generation passed %u != inode generation = %u, " | |
b0697053 MF |
329 | "ip_flags = %x, ip_blkno = %llu, msg %llu, i_count = %u, " |
330 | "message type = %u\n", generation, inode->i_generation, | |
331 | OCFS2_I(inode)->ip_flags, | |
332 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
333 | (unsigned long long)blkno, atomic_read(&inode->i_count), | |
334 | request); | |
ccd979bd MF |
335 | iput(inode); |
336 | inode = NULL; | |
337 | goto respond; | |
338 | } | |
339 | ||
340 | switch (request) { | |
341 | case OCFS2_VOTE_REQ_DELETE: | |
342 | vote_response = ocfs2_process_delete_request(inode, | |
343 | &orphaned_slot); | |
344 | break; | |
ccd979bd MF |
345 | default: |
346 | mlog(ML_ERROR, "node %u, invalid request: %u\n", | |
347 | node_num, request); | |
348 | vote_response = OCFS2_RESPONSE_BAD_MSG; | |
349 | } | |
350 | ||
351 | respond: | |
352 | /* Response struture is small so we just put it on the stack | |
353 | * and stuff it inline. */ | |
354 | memset(&response, 0, sizeof(struct ocfs2_response_msg)); | |
355 | response.r_hdr.h_response_id = hdr->h_response_id; | |
356 | response.r_hdr.h_blkno = hdr->h_blkno; | |
357 | response.r_hdr.h_generation = hdr->h_generation; | |
358 | response.r_hdr.h_node_num = cpu_to_be32(osb->node_num); | |
359 | response.r_response = cpu_to_be32(vote_response); | |
360 | response.r_orphaned_slot = cpu_to_be32(orphaned_slot); | |
361 | ||
362 | net_status = o2net_send_message(OCFS2_MESSAGE_TYPE_RESPONSE, | |
363 | osb->net_key, | |
364 | &response, | |
365 | sizeof(struct ocfs2_response_msg), | |
366 | node_num, | |
367 | NULL); | |
368 | /* We still want to error print for ENOPROTOOPT here. The | |
369 | * sending node shouldn't have unregistered his net handler | |
370 | * without sending an unmount vote 1st */ | |
371 | if (net_status < 0 | |
372 | && net_status != -ETIMEDOUT | |
373 | && net_status != -ENOTCONN) | |
374 | mlog(ML_ERROR, "message to node %u fails with error %d!\n", | |
375 | node_num, net_status); | |
376 | ||
377 | if (inode) | |
378 | iput(inode); | |
379 | } | |
380 | ||
381 | static void ocfs2_vote_thread_do_work(struct ocfs2_super *osb) | |
382 | { | |
383 | unsigned long processed; | |
384 | struct ocfs2_lock_res *lockres; | |
385 | struct ocfs2_vote_work *work; | |
386 | ||
387 | mlog_entry_void(); | |
388 | ||
389 | spin_lock(&osb->vote_task_lock); | |
390 | /* grab this early so we know to try again if a state change and | |
391 | * wake happens part-way through our work */ | |
392 | osb->vote_work_sequence = osb->vote_wake_sequence; | |
393 | ||
394 | processed = osb->blocked_lock_count; | |
395 | while (processed) { | |
396 | BUG_ON(list_empty(&osb->blocked_lock_list)); | |
397 | ||
398 | lockres = list_entry(osb->blocked_lock_list.next, | |
399 | struct ocfs2_lock_res, l_blocked_list); | |
400 | list_del_init(&lockres->l_blocked_list); | |
401 | osb->blocked_lock_count--; | |
402 | spin_unlock(&osb->vote_task_lock); | |
403 | ||
404 | BUG_ON(!processed); | |
405 | processed--; | |
406 | ||
407 | ocfs2_process_blocked_lock(osb, lockres); | |
408 | ||
409 | spin_lock(&osb->vote_task_lock); | |
410 | } | |
411 | ||
412 | while (osb->vote_count) { | |
413 | BUG_ON(list_empty(&osb->vote_list)); | |
414 | work = list_entry(osb->vote_list.next, | |
415 | struct ocfs2_vote_work, w_list); | |
416 | list_del(&work->w_list); | |
417 | osb->vote_count--; | |
418 | spin_unlock(&osb->vote_task_lock); | |
419 | ||
420 | ocfs2_process_vote(osb, &work->w_msg); | |
421 | kfree(work); | |
422 | ||
423 | spin_lock(&osb->vote_task_lock); | |
424 | } | |
425 | spin_unlock(&osb->vote_task_lock); | |
426 | ||
427 | mlog_exit_void(); | |
428 | } | |
429 | ||
430 | static int ocfs2_vote_thread_lists_empty(struct ocfs2_super *osb) | |
431 | { | |
432 | int empty = 0; | |
433 | ||
434 | spin_lock(&osb->vote_task_lock); | |
435 | if (list_empty(&osb->blocked_lock_list) && | |
436 | list_empty(&osb->vote_list)) | |
437 | empty = 1; | |
438 | ||
439 | spin_unlock(&osb->vote_task_lock); | |
440 | return empty; | |
441 | } | |
442 | ||
443 | static int ocfs2_vote_thread_should_wake(struct ocfs2_super *osb) | |
444 | { | |
445 | int should_wake = 0; | |
446 | ||
447 | spin_lock(&osb->vote_task_lock); | |
448 | if (osb->vote_work_sequence != osb->vote_wake_sequence) | |
449 | should_wake = 1; | |
450 | spin_unlock(&osb->vote_task_lock); | |
451 | ||
452 | return should_wake; | |
453 | } | |
454 | ||
455 | int ocfs2_vote_thread(void *arg) | |
456 | { | |
457 | int status = 0; | |
458 | struct ocfs2_super *osb = arg; | |
459 | ||
460 | /* only quit once we've been asked to stop and there is no more | |
461 | * work available */ | |
462 | while (!(kthread_should_stop() && | |
463 | ocfs2_vote_thread_lists_empty(osb))) { | |
464 | ||
465 | wait_event_interruptible(osb->vote_event, | |
466 | ocfs2_vote_thread_should_wake(osb) || | |
467 | kthread_should_stop()); | |
468 | ||
469 | mlog(0, "vote_thread: awoken\n"); | |
470 | ||
471 | ocfs2_vote_thread_do_work(osb); | |
472 | } | |
473 | ||
474 | osb->vote_task = NULL; | |
475 | return status; | |
476 | } | |
477 | ||
478 | static struct ocfs2_net_wait_ctxt *ocfs2_new_net_wait_ctxt(unsigned int response_id) | |
479 | { | |
480 | struct ocfs2_net_wait_ctxt *w; | |
481 | ||
cd861280 | 482 | w = kzalloc(sizeof(*w), GFP_NOFS); |
ccd979bd MF |
483 | if (!w) { |
484 | mlog_errno(-ENOMEM); | |
485 | goto bail; | |
486 | } | |
487 | ||
488 | INIT_LIST_HEAD(&w->n_list); | |
489 | init_waitqueue_head(&w->n_event); | |
490 | ocfs2_node_map_init(&w->n_node_map); | |
491 | w->n_response_id = response_id; | |
492 | w->n_callback = NULL; | |
493 | bail: | |
494 | return w; | |
495 | } | |
496 | ||
497 | static unsigned int ocfs2_new_response_id(struct ocfs2_super *osb) | |
498 | { | |
499 | unsigned int ret; | |
500 | ||
501 | spin_lock(&osb->net_response_lock); | |
502 | ret = ++osb->net_response_ids; | |
503 | spin_unlock(&osb->net_response_lock); | |
504 | ||
505 | return ret; | |
506 | } | |
507 | ||
508 | static void ocfs2_dequeue_net_wait_ctxt(struct ocfs2_super *osb, | |
509 | struct ocfs2_net_wait_ctxt *w) | |
510 | { | |
511 | spin_lock(&osb->net_response_lock); | |
512 | list_del(&w->n_list); | |
513 | spin_unlock(&osb->net_response_lock); | |
514 | } | |
515 | ||
516 | static void ocfs2_queue_net_wait_ctxt(struct ocfs2_super *osb, | |
517 | struct ocfs2_net_wait_ctxt *w) | |
518 | { | |
519 | spin_lock(&osb->net_response_lock); | |
520 | list_add_tail(&w->n_list, | |
521 | &osb->net_response_list); | |
522 | spin_unlock(&osb->net_response_lock); | |
523 | } | |
524 | ||
525 | static void __ocfs2_mark_node_responded(struct ocfs2_super *osb, | |
526 | struct ocfs2_net_wait_ctxt *w, | |
527 | int node_num) | |
528 | { | |
529 | assert_spin_locked(&osb->net_response_lock); | |
530 | ||
531 | ocfs2_node_map_clear_bit(osb, &w->n_node_map, node_num); | |
532 | if (ocfs2_node_map_is_empty(osb, &w->n_node_map)) | |
533 | wake_up(&w->n_event); | |
534 | } | |
535 | ||
536 | /* Intended to be called from the node down callback, we fake remove | |
537 | * the node from all our response contexts */ | |
538 | void ocfs2_remove_node_from_vote_queues(struct ocfs2_super *osb, | |
539 | int node_num) | |
540 | { | |
541 | struct list_head *p; | |
542 | struct ocfs2_net_wait_ctxt *w = NULL; | |
543 | ||
544 | spin_lock(&osb->net_response_lock); | |
545 | ||
546 | list_for_each(p, &osb->net_response_list) { | |
547 | w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list); | |
548 | ||
549 | __ocfs2_mark_node_responded(osb, w, node_num); | |
550 | } | |
551 | ||
552 | spin_unlock(&osb->net_response_lock); | |
553 | } | |
554 | ||
555 | static int ocfs2_broadcast_vote(struct ocfs2_super *osb, | |
556 | struct ocfs2_vote_msg *request, | |
557 | unsigned int response_id, | |
558 | int *response, | |
559 | struct ocfs2_net_response_cb *callback) | |
560 | { | |
561 | int status, i, remote_err; | |
562 | struct ocfs2_net_wait_ctxt *w = NULL; | |
563 | int dequeued = 0; | |
564 | ||
565 | mlog_entry_void(); | |
566 | ||
567 | w = ocfs2_new_net_wait_ctxt(response_id); | |
568 | if (!w) { | |
569 | status = -ENOMEM; | |
570 | mlog_errno(status); | |
571 | goto bail; | |
572 | } | |
573 | w->n_callback = callback; | |
574 | ||
575 | /* we're pretty much ready to go at this point, and this fills | |
576 | * in n_response which we need anyway... */ | |
577 | ocfs2_queue_net_wait_ctxt(osb, w); | |
578 | ||
579 | i = ocfs2_node_map_iterate(osb, &osb->mounted_map, 0); | |
580 | ||
581 | while (i != O2NM_INVALID_NODE_NUM) { | |
582 | if (i != osb->node_num) { | |
583 | mlog(0, "trying to send request to node %i\n", i); | |
584 | ocfs2_node_map_set_bit(osb, &w->n_node_map, i); | |
585 | ||
586 | remote_err = 0; | |
587 | status = o2net_send_message(OCFS2_MESSAGE_TYPE_VOTE, | |
588 | osb->net_key, | |
589 | request, | |
590 | sizeof(*request), | |
591 | i, | |
592 | &remote_err); | |
593 | if (status == -ETIMEDOUT) { | |
594 | mlog(0, "remote node %d timed out!\n", i); | |
595 | status = -EAGAIN; | |
596 | goto bail; | |
597 | } | |
598 | if (remote_err < 0) { | |
599 | status = remote_err; | |
600 | mlog(0, "remote error %d on node %d!\n", | |
601 | remote_err, i); | |
602 | mlog_errno(status); | |
603 | goto bail; | |
604 | } | |
605 | if (status < 0) { | |
606 | mlog_errno(status); | |
607 | goto bail; | |
608 | } | |
609 | } | |
610 | i++; | |
611 | i = ocfs2_node_map_iterate(osb, &osb->mounted_map, i); | |
612 | mlog(0, "next is %d, i am %d\n", i, osb->node_num); | |
613 | } | |
614 | mlog(0, "done sending, now waiting on responses...\n"); | |
615 | ||
616 | wait_event(w->n_event, ocfs2_node_map_is_empty(osb, &w->n_node_map)); | |
617 | ||
618 | ocfs2_dequeue_net_wait_ctxt(osb, w); | |
619 | dequeued = 1; | |
620 | ||
621 | *response = w->n_response; | |
622 | status = 0; | |
623 | bail: | |
624 | if (w) { | |
625 | if (!dequeued) | |
626 | ocfs2_dequeue_net_wait_ctxt(osb, w); | |
627 | kfree(w); | |
628 | } | |
629 | ||
630 | mlog_exit(status); | |
631 | return status; | |
632 | } | |
633 | ||
634 | static struct ocfs2_vote_msg * ocfs2_new_vote_request(struct ocfs2_super *osb, | |
635 | u64 blkno, | |
636 | unsigned int generation, | |
637 | enum ocfs2_vote_request type, | |
638 | u32 priv) | |
639 | { | |
640 | struct ocfs2_vote_msg *request; | |
641 | struct ocfs2_msg_hdr *hdr; | |
642 | ||
643 | BUG_ON(!ocfs2_is_valid_vote_request(type)); | |
644 | ||
cd861280 | 645 | request = kzalloc(sizeof(*request), GFP_NOFS); |
ccd979bd MF |
646 | if (!request) { |
647 | mlog_errno(-ENOMEM); | |
648 | } else { | |
649 | hdr = &request->v_hdr; | |
650 | hdr->h_node_num = cpu_to_be32(osb->node_num); | |
651 | hdr->h_request = cpu_to_be32(type); | |
652 | hdr->h_blkno = cpu_to_be64(blkno); | |
653 | hdr->h_generation = cpu_to_be32(generation); | |
654 | ||
655 | request->md1.v_generic1 = cpu_to_be32(priv); | |
656 | } | |
657 | ||
658 | return request; | |
659 | } | |
660 | ||
661 | /* Complete the buildup of a new vote request and process the | |
662 | * broadcast return value. */ | |
663 | static int ocfs2_do_request_vote(struct ocfs2_super *osb, | |
664 | struct ocfs2_vote_msg *request, | |
665 | struct ocfs2_net_response_cb *callback) | |
666 | { | |
667 | int status, response; | |
668 | unsigned int response_id; | |
669 | struct ocfs2_msg_hdr *hdr; | |
670 | ||
671 | response_id = ocfs2_new_response_id(osb); | |
672 | ||
673 | hdr = &request->v_hdr; | |
674 | hdr->h_response_id = cpu_to_be32(response_id); | |
675 | ||
676 | status = ocfs2_broadcast_vote(osb, request, response_id, &response, | |
677 | callback); | |
678 | if (status < 0) { | |
679 | mlog_errno(status); | |
680 | goto bail; | |
681 | } | |
682 | ||
683 | status = response; | |
684 | bail: | |
685 | ||
686 | return status; | |
687 | } | |
688 | ||
689 | static int ocfs2_request_vote(struct inode *inode, | |
690 | struct ocfs2_vote_msg *request, | |
691 | struct ocfs2_net_response_cb *callback) | |
692 | { | |
693 | int status; | |
694 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
695 | ||
696 | if (ocfs2_inode_is_new(inode)) | |
697 | return 0; | |
698 | ||
699 | status = -EAGAIN; | |
700 | while (status == -EAGAIN) { | |
701 | if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) && | |
702 | signal_pending(current)) | |
703 | return -ERESTARTSYS; | |
704 | ||
705 | status = ocfs2_super_lock(osb, 0); | |
706 | if (status < 0) { | |
707 | mlog_errno(status); | |
708 | break; | |
709 | } | |
710 | ||
711 | status = 0; | |
712 | if (!ocfs2_node_map_is_only(osb, &osb->mounted_map, | |
713 | osb->node_num)) | |
714 | status = ocfs2_do_request_vote(osb, request, callback); | |
715 | ||
716 | ocfs2_super_unlock(osb, 0); | |
717 | } | |
718 | return status; | |
719 | } | |
720 | ||
721 | static void ocfs2_delete_response_cb(void *priv, | |
722 | struct ocfs2_response_msg *resp) | |
723 | { | |
724 | int orphaned_slot, node; | |
725 | struct inode *inode = priv; | |
726 | ||
727 | orphaned_slot = be32_to_cpu(resp->r_orphaned_slot); | |
728 | node = be32_to_cpu(resp->r_hdr.h_node_num); | |
b0697053 MF |
729 | mlog(0, "node %d tells us that inode %llu is orphaned in slot %d\n", |
730 | node, (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
731 | orphaned_slot); | |
ccd979bd MF |
732 | |
733 | /* The other node may not actually know which slot the inode | |
734 | * is orphaned in. */ | |
735 | if (orphaned_slot == OCFS2_INVALID_SLOT) | |
736 | return; | |
737 | ||
738 | /* Ok, the responding node knows which slot this inode is | |
739 | * orphaned in. We verify that the information is correct and | |
740 | * then record this in the inode. ocfs2_delete_inode will use | |
741 | * this information to determine which lock to take. */ | |
742 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
743 | mlog_bug_on_msg(OCFS2_I(inode)->ip_orphaned_slot != orphaned_slot && | |
744 | OCFS2_I(inode)->ip_orphaned_slot | |
b0697053 MF |
745 | != OCFS2_INVALID_SLOT, "Inode %llu: Node %d says it's " |
746 | "orphaned in slot %d, we think it's in %d\n", | |
747 | (unsigned long long)OCFS2_I(inode)->ip_blkno, | |
ccd979bd MF |
748 | be32_to_cpu(resp->r_hdr.h_node_num), |
749 | orphaned_slot, OCFS2_I(inode)->ip_orphaned_slot); | |
750 | ||
751 | OCFS2_I(inode)->ip_orphaned_slot = orphaned_slot; | |
752 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
753 | } | |
754 | ||
755 | int ocfs2_request_delete_vote(struct inode *inode) | |
756 | { | |
757 | int orphaned_slot, status; | |
758 | struct ocfs2_net_response_cb delete_cb; | |
759 | struct ocfs2_super *osb = OCFS2_SB(inode->i_sb); | |
760 | struct ocfs2_vote_msg *request; | |
761 | ||
762 | spin_lock(&OCFS2_I(inode)->ip_lock); | |
763 | orphaned_slot = OCFS2_I(inode)->ip_orphaned_slot; | |
764 | spin_unlock(&OCFS2_I(inode)->ip_lock); | |
765 | ||
766 | delete_cb.rc_cb = ocfs2_delete_response_cb; | |
767 | delete_cb.rc_priv = inode; | |
768 | ||
b0697053 MF |
769 | mlog(0, "Inode %llu, we start thinking orphaned slot is %d\n", |
770 | (unsigned long long)OCFS2_I(inode)->ip_blkno, orphaned_slot); | |
ccd979bd MF |
771 | |
772 | status = -ENOMEM; | |
773 | request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno, | |
774 | inode->i_generation, | |
775 | OCFS2_VOTE_REQ_DELETE, orphaned_slot); | |
776 | if (request) { | |
777 | status = ocfs2_request_vote(inode, request, &delete_cb); | |
778 | ||
779 | kfree(request); | |
780 | } | |
781 | ||
782 | return status; | |
783 | } | |
784 | ||
ccd979bd MF |
785 | int ocfs2_request_mount_vote(struct ocfs2_super *osb) |
786 | { | |
787 | int status; | |
788 | struct ocfs2_vote_msg *request = NULL; | |
789 | ||
790 | request = ocfs2_new_vote_request(osb, 0ULL, 0, | |
791 | OCFS2_VOTE_REQ_MOUNT, 0); | |
792 | if (!request) { | |
793 | status = -ENOMEM; | |
794 | goto bail; | |
795 | } | |
796 | ||
797 | status = -EAGAIN; | |
798 | while (status == -EAGAIN) { | |
799 | if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) && | |
800 | signal_pending(current)) { | |
801 | status = -ERESTARTSYS; | |
802 | goto bail; | |
803 | } | |
804 | ||
805 | if (ocfs2_node_map_is_only(osb, &osb->mounted_map, | |
806 | osb->node_num)) { | |
807 | status = 0; | |
808 | goto bail; | |
809 | } | |
810 | ||
811 | status = ocfs2_do_request_vote(osb, request, NULL); | |
812 | } | |
813 | ||
814 | bail: | |
4ad98457 | 815 | kfree(request); |
ccd979bd MF |
816 | return status; |
817 | } | |
818 | ||
819 | int ocfs2_request_umount_vote(struct ocfs2_super *osb) | |
820 | { | |
821 | int status; | |
822 | struct ocfs2_vote_msg *request = NULL; | |
823 | ||
824 | request = ocfs2_new_vote_request(osb, 0ULL, 0, | |
825 | OCFS2_VOTE_REQ_UMOUNT, 0); | |
826 | if (!request) { | |
827 | status = -ENOMEM; | |
828 | goto bail; | |
829 | } | |
830 | ||
831 | status = -EAGAIN; | |
832 | while (status == -EAGAIN) { | |
833 | /* Do not check signals on this vote... We really want | |
834 | * this one to go all the way through. */ | |
835 | ||
836 | if (ocfs2_node_map_is_only(osb, &osb->mounted_map, | |
837 | osb->node_num)) { | |
838 | status = 0; | |
839 | goto bail; | |
840 | } | |
841 | ||
842 | status = ocfs2_do_request_vote(osb, request, NULL); | |
843 | } | |
844 | ||
845 | bail: | |
4ad98457 | 846 | kfree(request); |
ccd979bd MF |
847 | return status; |
848 | } | |
849 | ||
850 | /* TODO: This should eventually be a hash table! */ | |
851 | static struct ocfs2_net_wait_ctxt * __ocfs2_find_net_wait_ctxt(struct ocfs2_super *osb, | |
852 | u32 response_id) | |
853 | { | |
854 | struct list_head *p; | |
855 | struct ocfs2_net_wait_ctxt *w = NULL; | |
856 | ||
857 | list_for_each(p, &osb->net_response_list) { | |
858 | w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list); | |
859 | if (response_id == w->n_response_id) | |
860 | break; | |
861 | w = NULL; | |
862 | } | |
863 | ||
864 | return w; | |
865 | } | |
866 | ||
867 | /* Translate response codes into local node errno values */ | |
868 | static inline int ocfs2_translate_response(int response) | |
869 | { | |
870 | int ret; | |
871 | ||
872 | switch (response) { | |
873 | case OCFS2_RESPONSE_OK: | |
874 | ret = 0; | |
875 | break; | |
876 | ||
877 | case OCFS2_RESPONSE_BUSY: | |
878 | ret = -EBUSY; | |
879 | break; | |
880 | ||
881 | default: | |
882 | ret = -EINVAL; | |
883 | } | |
884 | ||
885 | return ret; | |
886 | } | |
887 | ||
888 | static int ocfs2_handle_response_message(struct o2net_msg *msg, | |
889 | u32 len, | |
890 | void *data) | |
891 | { | |
892 | unsigned int response_id, node_num; | |
893 | int response_status; | |
894 | struct ocfs2_super *osb = data; | |
895 | struct ocfs2_response_msg *resp; | |
896 | struct ocfs2_net_wait_ctxt * w; | |
897 | struct ocfs2_net_response_cb *resp_cb; | |
898 | ||
899 | resp = (struct ocfs2_response_msg *) msg->buf; | |
900 | ||
901 | response_id = be32_to_cpu(resp->r_hdr.h_response_id); | |
902 | node_num = be32_to_cpu(resp->r_hdr.h_node_num); | |
903 | response_status = | |
904 | ocfs2_translate_response(be32_to_cpu(resp->r_response)); | |
905 | ||
906 | mlog(0, "received response message:\n"); | |
907 | mlog(0, "h_response_id = %u\n", response_id); | |
908 | mlog(0, "h_request = %u\n", be32_to_cpu(resp->r_hdr.h_request)); | |
b0697053 MF |
909 | mlog(0, "h_blkno = %llu\n", |
910 | (unsigned long long)be64_to_cpu(resp->r_hdr.h_blkno)); | |
ccd979bd MF |
911 | mlog(0, "h_generation = %u\n", be32_to_cpu(resp->r_hdr.h_generation)); |
912 | mlog(0, "h_node_num = %u\n", node_num); | |
913 | mlog(0, "r_response = %d\n", response_status); | |
914 | ||
915 | spin_lock(&osb->net_response_lock); | |
916 | w = __ocfs2_find_net_wait_ctxt(osb, response_id); | |
917 | if (!w) { | |
918 | mlog(0, "request not found!\n"); | |
919 | goto bail; | |
920 | } | |
921 | resp_cb = w->n_callback; | |
922 | ||
923 | if (response_status && (!w->n_response)) { | |
924 | /* we only really need one negative response so don't | |
925 | * set it twice. */ | |
926 | w->n_response = response_status; | |
927 | } | |
928 | ||
929 | if (resp_cb) { | |
930 | spin_unlock(&osb->net_response_lock); | |
931 | ||
932 | resp_cb->rc_cb(resp_cb->rc_priv, resp); | |
933 | ||
934 | spin_lock(&osb->net_response_lock); | |
935 | } | |
936 | ||
937 | __ocfs2_mark_node_responded(osb, w, node_num); | |
938 | bail: | |
939 | spin_unlock(&osb->net_response_lock); | |
940 | ||
941 | return 0; | |
942 | } | |
943 | ||
944 | static int ocfs2_handle_vote_message(struct o2net_msg *msg, | |
945 | u32 len, | |
946 | void *data) | |
947 | { | |
948 | int status; | |
949 | struct ocfs2_super *osb = data; | |
950 | struct ocfs2_vote_work *work; | |
951 | ||
afae00ab | 952 | work = kmalloc(sizeof(struct ocfs2_vote_work), GFP_NOFS); |
ccd979bd MF |
953 | if (!work) { |
954 | status = -ENOMEM; | |
955 | mlog_errno(status); | |
956 | goto bail; | |
957 | } | |
958 | ||
959 | INIT_LIST_HEAD(&work->w_list); | |
960 | memcpy(&work->w_msg, msg->buf, sizeof(struct ocfs2_vote_msg)); | |
961 | ||
962 | mlog(0, "scheduling vote request:\n"); | |
963 | mlog(0, "h_response_id = %u\n", | |
964 | be32_to_cpu(work->w_msg.v_hdr.h_response_id)); | |
965 | mlog(0, "h_request = %u\n", be32_to_cpu(work->w_msg.v_hdr.h_request)); | |
b0697053 MF |
966 | mlog(0, "h_blkno = %llu\n", |
967 | (unsigned long long)be64_to_cpu(work->w_msg.v_hdr.h_blkno)); | |
ccd979bd MF |
968 | mlog(0, "h_generation = %u\n", |
969 | be32_to_cpu(work->w_msg.v_hdr.h_generation)); | |
970 | mlog(0, "h_node_num = %u\n", | |
971 | be32_to_cpu(work->w_msg.v_hdr.h_node_num)); | |
972 | mlog(0, "v_generic1 = %u\n", be32_to_cpu(work->w_msg.md1.v_generic1)); | |
973 | ||
974 | spin_lock(&osb->vote_task_lock); | |
975 | list_add_tail(&work->w_list, &osb->vote_list); | |
976 | osb->vote_count++; | |
977 | spin_unlock(&osb->vote_task_lock); | |
978 | ||
979 | ocfs2_kick_vote_thread(osb); | |
980 | ||
981 | status = 0; | |
982 | bail: | |
983 | return status; | |
984 | } | |
985 | ||
986 | void ocfs2_unregister_net_handlers(struct ocfs2_super *osb) | |
987 | { | |
988 | if (!osb->net_key) | |
989 | return; | |
990 | ||
991 | o2net_unregister_handler_list(&osb->osb_net_handlers); | |
992 | ||
993 | if (!list_empty(&osb->net_response_list)) | |
994 | mlog(ML_ERROR, "net response list not empty!\n"); | |
995 | ||
996 | osb->net_key = 0; | |
997 | } | |
998 | ||
999 | int ocfs2_register_net_handlers(struct ocfs2_super *osb) | |
1000 | { | |
1001 | int status = 0; | |
1002 | ||
c271c5c2 SM |
1003 | if (ocfs2_mount_local(osb)) |
1004 | return 0; | |
1005 | ||
ccd979bd MF |
1006 | status = o2net_register_handler(OCFS2_MESSAGE_TYPE_RESPONSE, |
1007 | osb->net_key, | |
1008 | sizeof(struct ocfs2_response_msg), | |
1009 | ocfs2_handle_response_message, | |
1010 | osb, &osb->osb_net_handlers); | |
1011 | if (status) { | |
1012 | mlog_errno(status); | |
1013 | goto bail; | |
1014 | } | |
1015 | ||
1016 | status = o2net_register_handler(OCFS2_MESSAGE_TYPE_VOTE, | |
1017 | osb->net_key, | |
1018 | sizeof(struct ocfs2_vote_msg), | |
1019 | ocfs2_handle_vote_message, | |
1020 | osb, &osb->osb_net_handlers); | |
1021 | if (status) { | |
1022 | mlog_errno(status); | |
1023 | goto bail; | |
1024 | } | |
1025 | bail: | |
1026 | if (status < 0) | |
1027 | ocfs2_unregister_net_handlers(osb); | |
1028 | ||
1029 | return status; | |
1030 | } |