ocfs2: don't use MLF* in the file system
[linux-2.6.git] / fs / ocfs2 / vote.c
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 */
77         __be32 v_unlink_namelen;
78         __be64 v_unlink_parent;
79         u8  v_unlink_dirent[OCFS2_VOTE_FILENAME_LEN];
80 };
81
82 /* Responses are given these values to maintain backwards
83  * compatibility with older ocfs2 versions */
84 #define OCFS2_RESPONSE_OK               (0)
85 #define OCFS2_RESPONSE_BUSY             (-16)
86 #define OCFS2_RESPONSE_BAD_MSG          (-22)
87
88 struct ocfs2_response_msg
89 {
90         struct ocfs2_msg_hdr r_hdr;
91         __be32 r_response;
92         __be32 r_orphaned_slot;
93 };
94
95 struct ocfs2_vote_work {
96         struct list_head   w_list;
97         struct ocfs2_vote_msg w_msg;
98 };
99
100 enum ocfs2_vote_request {
101         OCFS2_VOTE_REQ_INVALID = 0,
102         OCFS2_VOTE_REQ_DELETE,
103         OCFS2_VOTE_REQ_UNLINK,
104         OCFS2_VOTE_REQ_RENAME,
105         OCFS2_VOTE_REQ_MOUNT,
106         OCFS2_VOTE_REQ_UMOUNT,
107         OCFS2_VOTE_REQ_LAST
108 };
109
110 static inline int ocfs2_is_valid_vote_request(int request)
111 {
112         return OCFS2_VOTE_REQ_INVALID < request &&
113                 request < OCFS2_VOTE_REQ_LAST;
114 }
115
116 typedef void (*ocfs2_net_response_callback)(void *priv,
117                                             struct ocfs2_response_msg *resp);
118 struct ocfs2_net_response_cb {
119         ocfs2_net_response_callback     rc_cb;
120         void                            *rc_priv;
121 };
122
123 struct ocfs2_net_wait_ctxt {
124         struct list_head        n_list;
125         u32                     n_response_id;
126         wait_queue_head_t       n_event;
127         struct ocfs2_node_map   n_node_map;
128         int                     n_response; /* an agreggate response. 0 if
129                                              * all nodes are go, < 0 on any
130                                              * negative response from any
131                                              * node or network error. */
132         struct ocfs2_net_response_cb *n_callback;
133 };
134
135 static void ocfs2_process_mount_request(struct ocfs2_super *osb,
136                                         unsigned int node_num)
137 {
138         mlog(0, "MOUNT vote from node %u\n", node_num);
139         /* The other node only sends us this message when he has an EX
140          * on the superblock, so our recovery threads (if having been
141          * launched) are waiting on it.*/
142         ocfs2_recovery_map_clear(osb, node_num);
143         ocfs2_node_map_set_bit(osb, &osb->mounted_map, node_num);
144
145         /* We clear the umount map here because a node may have been
146          * previously mounted, safely unmounted but never stopped
147          * heartbeating - in which case we'd have a stale entry. */
148         ocfs2_node_map_clear_bit(osb, &osb->umount_map, node_num);
149 }
150
151 static void ocfs2_process_umount_request(struct ocfs2_super *osb,
152                                          unsigned int node_num)
153 {
154         mlog(0, "UMOUNT vote from node %u\n", node_num);
155         ocfs2_node_map_clear_bit(osb, &osb->mounted_map, node_num);
156         ocfs2_node_map_set_bit(osb, &osb->umount_map, node_num);
157 }
158
159 void ocfs2_mark_inode_remotely_deleted(struct inode *inode)
160 {
161         struct ocfs2_inode_info *oi = OCFS2_I(inode);
162
163         assert_spin_locked(&oi->ip_lock);
164         /* We set the SKIP_DELETE flag on the inode so we don't try to
165          * delete it in delete_inode ourselves, thus avoiding
166          * unecessary lock pinging. If the other node failed to wipe
167          * the inode as a result of a crash, then recovery will pick
168          * up the slack. */
169         oi->ip_flags |= OCFS2_INODE_DELETED|OCFS2_INODE_SKIP_DELETE;
170 }
171
172 static int ocfs2_process_delete_request(struct inode *inode,
173                                         int *orphaned_slot)
174 {
175         int response = OCFS2_RESPONSE_BUSY;
176
177         mlog(0, "DELETE vote on inode %lu, read lnk_cnt = %u, slot = %d\n",
178              inode->i_ino, inode->i_nlink, *orphaned_slot);
179
180         spin_lock(&OCFS2_I(inode)->ip_lock);
181
182         /* Whatever our vote response is, we want to make sure that
183          * the orphaned slot is recorded properly on this node *and*
184          * on the requesting node. Technically, if the requesting node
185          * did not know which slot the inode is orphaned in but we
186          * respond with BUSY he doesn't actually need the orphaned
187          * slot, but it doesn't hurt to do it here anyway. */
188         if ((*orphaned_slot) != OCFS2_INVALID_SLOT) {
189                 mlog_bug_on_msg(OCFS2_I(inode)->ip_orphaned_slot !=
190                                 OCFS2_INVALID_SLOT &&
191                                 OCFS2_I(inode)->ip_orphaned_slot !=
192                                 (*orphaned_slot),
193                                 "Inode %llu: This node thinks it's "
194                                 "orphaned in slot %d, messaged it's in %d\n",
195                                 (unsigned long long)OCFS2_I(inode)->ip_blkno,
196                                 OCFS2_I(inode)->ip_orphaned_slot,
197                                 *orphaned_slot);
198
199                 mlog(0, "Setting orphaned slot for inode %llu to %d\n",
200                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
201                      *orphaned_slot);
202
203                 OCFS2_I(inode)->ip_orphaned_slot = *orphaned_slot;
204         } else {
205                 mlog(0, "Sending back orphaned slot %d for inode %llu\n",
206                      OCFS2_I(inode)->ip_orphaned_slot,
207                      (unsigned long long)OCFS2_I(inode)->ip_blkno);
208
209                 *orphaned_slot = OCFS2_I(inode)->ip_orphaned_slot;
210         }
211
212         /* vote no if the file is still open. */
213         if (OCFS2_I(inode)->ip_open_count) {
214                 mlog(0, "open count = %u\n",
215                      OCFS2_I(inode)->ip_open_count);
216                 spin_unlock(&OCFS2_I(inode)->ip_lock);
217                 goto done;
218         }
219         spin_unlock(&OCFS2_I(inode)->ip_lock);
220
221         /* directories are a bit ugly... What if someone is sitting in
222          * it? We want to make sure the inode is removed completely as
223          * a result of the iput in process_vote. */
224         if (S_ISDIR(inode->i_mode) && (atomic_read(&inode->i_count) != 1)) {
225                 mlog(0, "i_count = %u\n", atomic_read(&inode->i_count));
226                 goto done;
227         }
228
229         if (filemap_fdatawrite(inode->i_mapping)) {
230                 mlog(ML_ERROR, "Could not sync inode %llu for delete!\n",
231                      (unsigned long long)OCFS2_I(inode)->ip_blkno);
232                 goto done;
233         }
234         sync_mapping_buffers(inode->i_mapping);
235         truncate_inode_pages(inode->i_mapping, 0);
236         ocfs2_extent_map_trunc(inode, 0);
237
238         spin_lock(&OCFS2_I(inode)->ip_lock);
239         /* double check open count - someone might have raced this
240          * thread into ocfs2_file_open while we were writing out
241          * data. If we're to allow a wipe of this inode now, we *must*
242          * hold the spinlock until we've marked it. */
243         if (OCFS2_I(inode)->ip_open_count) {
244                 mlog(0, "Raced to wipe! open count = %u\n",
245                      OCFS2_I(inode)->ip_open_count);
246                 spin_unlock(&OCFS2_I(inode)->ip_lock);
247                 goto done;
248         }
249
250         /* Mark the inode as being wiped from disk. */
251         ocfs2_mark_inode_remotely_deleted(inode);
252         spin_unlock(&OCFS2_I(inode)->ip_lock);
253
254         /* Not sure this is necessary anymore. */
255         d_prune_aliases(inode);
256
257         /* If we get here, then we're voting 'yes', so commit the
258          * delete on our side. */
259         response = OCFS2_RESPONSE_OK;
260 done:
261         return response;
262 }
263
264 static int ocfs2_match_dentry(struct dentry *dentry,
265                               u64 parent_blkno,
266                               unsigned int namelen,
267                               const char *name)
268 {
269         struct inode *parent;
270
271         if (!dentry->d_parent) {
272                 mlog(0, "Detached from parent.\n");
273                 return 0;
274         }
275
276         parent = dentry->d_parent->d_inode;
277         /* Negative parent dentry? */
278         if (!parent)
279                 return 0;
280
281         /* Name is in a different directory. */
282         if (OCFS2_I(parent)->ip_blkno != parent_blkno)
283                 return 0;
284
285         if (dentry->d_name.len != namelen)
286                 return 0;
287
288         /* comparison above guarantees this is safe. */
289         if (memcmp(dentry->d_name.name, name, namelen))
290                 return 0;
291
292         return 1;
293 }
294
295 static void ocfs2_process_dentry_request(struct inode *inode,
296                                          int rename,
297                                          unsigned int new_nlink,
298                                          u64 parent_blkno,
299                                          unsigned int namelen,
300                                          const char *name)
301 {
302         struct dentry *dentry = NULL;
303         struct list_head *p;
304         struct ocfs2_inode_info *oi = OCFS2_I(inode);
305
306         mlog(0, "parent %llu, namelen = %u, name = %.*s\n",
307              (unsigned long long)parent_blkno, namelen, namelen, name);
308
309         spin_lock(&dcache_lock);
310
311         /* Another node is removing this name from the system. It is
312          * up to us to find the corresponding dentry and if it exists,
313          * unhash it from the dcache. */
314         list_for_each(p, &inode->i_dentry) {
315                 dentry = list_entry(p, struct dentry, d_alias);
316
317                 if (ocfs2_match_dentry(dentry, parent_blkno, namelen, name)) {
318                         mlog(0, "dentry found: %.*s\n",
319                              dentry->d_name.len, dentry->d_name.name);
320
321                         dget_locked(dentry);
322                         break;
323                 }
324
325                 dentry = NULL;
326         }
327
328         spin_unlock(&dcache_lock);
329
330         if (dentry) {
331                 d_delete(dentry);
332                 dput(dentry);
333         }
334
335         /* rename votes don't send link counts */
336         if (!rename) {
337                 mlog(0, "new_nlink = %u\n", new_nlink);
338
339                 /* We don't have the proper locks here to directly
340                  * change i_nlink and besides, the vote is sent
341                  * *before* the operation so it may have failed on the
342                  * other node. This passes a hint to ocfs2_drop_inode
343                  * to force ocfs2_delete_inode, who will take the
344                  * proper cluster locks to sort things out. */
345                 if (new_nlink == 0) {
346                         spin_lock(&oi->ip_lock);
347                         oi->ip_flags |= OCFS2_INODE_MAYBE_ORPHANED;
348                         spin_unlock(&OCFS2_I(inode)->ip_lock);
349                 }
350         }
351 }
352
353 static void ocfs2_process_vote(struct ocfs2_super *osb,
354                                struct ocfs2_vote_msg *msg)
355 {
356         int net_status, vote_response;
357         int orphaned_slot = 0;
358         int rename = 0;
359         unsigned int node_num, generation, new_nlink, namelen;
360         u64 blkno, parent_blkno;
361         enum ocfs2_vote_request request;
362         struct inode *inode = NULL;
363         struct ocfs2_msg_hdr *hdr = &msg->v_hdr;
364         struct ocfs2_response_msg response;
365
366         /* decode the network mumbo jumbo into local variables. */
367         request = be32_to_cpu(hdr->h_request);
368         blkno = be64_to_cpu(hdr->h_blkno);
369         generation = be32_to_cpu(hdr->h_generation);
370         node_num = be32_to_cpu(hdr->h_node_num);
371         if (request == OCFS2_VOTE_REQ_DELETE)
372                 orphaned_slot = be32_to_cpu(msg->md1.v_orphaned_slot);
373
374         mlog(0, "processing vote: request = %u, blkno = %llu, "
375              "generation = %u, node_num = %u, priv1 = %u\n", request,
376              (unsigned long long)blkno, generation, node_num,
377              be32_to_cpu(msg->md1.v_generic1));
378
379         if (!ocfs2_is_valid_vote_request(request)) {
380                 mlog(ML_ERROR, "Invalid vote request %d from node %u\n",
381                      request, node_num);
382                 vote_response = OCFS2_RESPONSE_BAD_MSG;
383                 goto respond;
384         }
385
386         vote_response = OCFS2_RESPONSE_OK;
387
388         switch (request) {
389         case OCFS2_VOTE_REQ_UMOUNT:
390                 ocfs2_process_umount_request(osb, node_num);
391                 goto respond;
392         case OCFS2_VOTE_REQ_MOUNT:
393                 ocfs2_process_mount_request(osb, node_num);
394                 goto respond;
395         default:
396                 /* avoids a gcc warning */
397                 break;
398         }
399
400         /* We cannot process the remaining message types before we're
401          * fully mounted. It's perfectly safe however to send a 'yes'
402          * response as we can't possibly have any of the state they're
403          * asking us to modify yet. */
404         if (atomic_read(&osb->vol_state) == VOLUME_INIT)
405                 goto respond;
406
407         /* If we get here, then the request is against an inode. */
408         inode = ocfs2_ilookup_for_vote(osb, blkno,
409                                        request == OCFS2_VOTE_REQ_DELETE);
410
411         /* Not finding the inode is perfectly valid - it means we're
412          * not interested in what the other node is about to do to it
413          * so in those cases we automatically respond with an
414          * affirmative. Cluster locking ensures that we won't race
415          * interest in the inode with this vote request. */
416         if (!inode)
417                 goto respond;
418
419         /* Check generation values. It's possible for us to get a
420          * request against a stale inode. If so then we proceed as if
421          * we had not found an inode in the first place. */
422         if (inode->i_generation != generation) {
423                 mlog(0, "generation passed %u != inode generation = %u, "
424                      "ip_flags = %x, ip_blkno = %llu, msg %llu, i_count = %u, "
425                      "message type = %u\n", generation, inode->i_generation,
426                      OCFS2_I(inode)->ip_flags,
427                      (unsigned long long)OCFS2_I(inode)->ip_blkno,
428                      (unsigned long long)blkno, atomic_read(&inode->i_count),
429                      request);
430                 iput(inode);
431                 inode = NULL;
432                 goto respond;
433         }
434
435         switch (request) {
436         case OCFS2_VOTE_REQ_DELETE:
437                 vote_response = ocfs2_process_delete_request(inode,
438                                                              &orphaned_slot);
439                 break;
440         case OCFS2_VOTE_REQ_RENAME:
441                 rename = 1;
442                 /* fall through */
443         case OCFS2_VOTE_REQ_UNLINK:
444                 parent_blkno = be64_to_cpu(msg->v_unlink_parent);
445                 namelen = be32_to_cpu(msg->v_unlink_namelen);
446                 /* new_nlink will be ignored in case of a rename vote */
447                 new_nlink = be32_to_cpu(msg->md1.v_nlink);
448                 ocfs2_process_dentry_request(inode, rename, new_nlink,
449                                              parent_blkno, namelen,
450                                              msg->v_unlink_dirent);
451                 break;
452         default:
453                 mlog(ML_ERROR, "node %u, invalid request: %u\n",
454                      node_num, request);
455                 vote_response = OCFS2_RESPONSE_BAD_MSG;
456         }
457
458 respond:
459         /* Response struture is small so we just put it on the stack
460          * and stuff it inline. */
461         memset(&response, 0, sizeof(struct ocfs2_response_msg));
462         response.r_hdr.h_response_id = hdr->h_response_id;
463         response.r_hdr.h_blkno = hdr->h_blkno;
464         response.r_hdr.h_generation = hdr->h_generation;
465         response.r_hdr.h_node_num = cpu_to_be32(osb->node_num);
466         response.r_response = cpu_to_be32(vote_response);
467         response.r_orphaned_slot = cpu_to_be32(orphaned_slot);
468
469         net_status = o2net_send_message(OCFS2_MESSAGE_TYPE_RESPONSE,
470                                         osb->net_key,
471                                         &response,
472                                         sizeof(struct ocfs2_response_msg),
473                                         node_num,
474                                         NULL);
475         /* We still want to error print for ENOPROTOOPT here. The
476          * sending node shouldn't have unregistered his net handler
477          * without sending an unmount vote 1st */
478         if (net_status < 0
479             && net_status != -ETIMEDOUT
480             && net_status != -ENOTCONN)
481                 mlog(ML_ERROR, "message to node %u fails with error %d!\n",
482                      node_num, net_status);
483
484         if (inode)
485                 iput(inode);
486 }
487
488 static void ocfs2_vote_thread_do_work(struct ocfs2_super *osb)
489 {
490         unsigned long processed;
491         struct ocfs2_lock_res *lockres;
492         struct ocfs2_vote_work *work;
493
494         mlog_entry_void();
495
496         spin_lock(&osb->vote_task_lock);
497         /* grab this early so we know to try again if a state change and
498          * wake happens part-way through our work  */
499         osb->vote_work_sequence = osb->vote_wake_sequence;
500
501         processed = osb->blocked_lock_count;
502         while (processed) {
503                 BUG_ON(list_empty(&osb->blocked_lock_list));
504
505                 lockres = list_entry(osb->blocked_lock_list.next,
506                                      struct ocfs2_lock_res, l_blocked_list);
507                 list_del_init(&lockres->l_blocked_list);
508                 osb->blocked_lock_count--;
509                 spin_unlock(&osb->vote_task_lock);
510
511                 BUG_ON(!processed);
512                 processed--;
513
514                 ocfs2_process_blocked_lock(osb, lockres);
515
516                 spin_lock(&osb->vote_task_lock);
517         }
518
519         while (osb->vote_count) {
520                 BUG_ON(list_empty(&osb->vote_list));
521                 work = list_entry(osb->vote_list.next,
522                                   struct ocfs2_vote_work, w_list);
523                 list_del(&work->w_list);
524                 osb->vote_count--;
525                 spin_unlock(&osb->vote_task_lock);
526
527                 ocfs2_process_vote(osb, &work->w_msg);
528                 kfree(work);
529
530                 spin_lock(&osb->vote_task_lock);
531         }
532         spin_unlock(&osb->vote_task_lock);
533
534         mlog_exit_void();
535 }
536
537 static int ocfs2_vote_thread_lists_empty(struct ocfs2_super *osb)
538 {
539         int empty = 0;
540
541         spin_lock(&osb->vote_task_lock);
542         if (list_empty(&osb->blocked_lock_list) &&
543             list_empty(&osb->vote_list))
544                 empty = 1;
545
546         spin_unlock(&osb->vote_task_lock);
547         return empty;
548 }
549
550 static int ocfs2_vote_thread_should_wake(struct ocfs2_super *osb)
551 {
552         int should_wake = 0;
553
554         spin_lock(&osb->vote_task_lock);
555         if (osb->vote_work_sequence != osb->vote_wake_sequence)
556                 should_wake = 1;
557         spin_unlock(&osb->vote_task_lock);
558
559         return should_wake;
560 }
561
562 int ocfs2_vote_thread(void *arg)
563 {
564         int status = 0;
565         struct ocfs2_super *osb = arg;
566
567         /* only quit once we've been asked to stop and there is no more
568          * work available */
569         while (!(kthread_should_stop() &&
570                  ocfs2_vote_thread_lists_empty(osb))) {
571
572                 wait_event_interruptible(osb->vote_event,
573                                          ocfs2_vote_thread_should_wake(osb) ||
574                                          kthread_should_stop());
575
576                 mlog(0, "vote_thread: awoken\n");
577
578                 ocfs2_vote_thread_do_work(osb);
579         }
580
581         osb->vote_task = NULL;
582         return status;
583 }
584
585 static struct ocfs2_net_wait_ctxt *ocfs2_new_net_wait_ctxt(unsigned int response_id)
586 {
587         struct ocfs2_net_wait_ctxt *w;
588
589         w = kcalloc(1, sizeof(*w), GFP_KERNEL);
590         if (!w) {
591                 mlog_errno(-ENOMEM);
592                 goto bail;
593         }
594
595         INIT_LIST_HEAD(&w->n_list);
596         init_waitqueue_head(&w->n_event);
597         ocfs2_node_map_init(&w->n_node_map);
598         w->n_response_id = response_id;
599         w->n_callback = NULL;
600 bail:
601         return w;
602 }
603
604 static unsigned int ocfs2_new_response_id(struct ocfs2_super *osb)
605 {
606         unsigned int ret;
607
608         spin_lock(&osb->net_response_lock);
609         ret = ++osb->net_response_ids;
610         spin_unlock(&osb->net_response_lock);
611
612         return ret;
613 }
614
615 static void ocfs2_dequeue_net_wait_ctxt(struct ocfs2_super *osb,
616                                         struct ocfs2_net_wait_ctxt *w)
617 {
618         spin_lock(&osb->net_response_lock);
619         list_del(&w->n_list);
620         spin_unlock(&osb->net_response_lock);
621 }
622
623 static void ocfs2_queue_net_wait_ctxt(struct ocfs2_super *osb,
624                                       struct ocfs2_net_wait_ctxt *w)
625 {
626         spin_lock(&osb->net_response_lock);
627         list_add_tail(&w->n_list,
628                       &osb->net_response_list);
629         spin_unlock(&osb->net_response_lock);
630 }
631
632 static void __ocfs2_mark_node_responded(struct ocfs2_super *osb,
633                                         struct ocfs2_net_wait_ctxt *w,
634                                         int node_num)
635 {
636         assert_spin_locked(&osb->net_response_lock);
637
638         ocfs2_node_map_clear_bit(osb, &w->n_node_map, node_num);
639         if (ocfs2_node_map_is_empty(osb, &w->n_node_map))
640                 wake_up(&w->n_event);
641 }
642
643 /* Intended to be called from the node down callback, we fake remove
644  * the node from all our response contexts */
645 void ocfs2_remove_node_from_vote_queues(struct ocfs2_super *osb,
646                                         int node_num)
647 {
648         struct list_head *p;
649         struct ocfs2_net_wait_ctxt *w = NULL;
650
651         spin_lock(&osb->net_response_lock);
652
653         list_for_each(p, &osb->net_response_list) {
654                 w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list);
655
656                 __ocfs2_mark_node_responded(osb, w, node_num);
657         }
658
659         spin_unlock(&osb->net_response_lock);
660 }
661
662 static int ocfs2_broadcast_vote(struct ocfs2_super *osb,
663                                 struct ocfs2_vote_msg *request,
664                                 unsigned int response_id,
665                                 int *response,
666                                 struct ocfs2_net_response_cb *callback)
667 {
668         int status, i, remote_err;
669         struct ocfs2_net_wait_ctxt *w = NULL;
670         int dequeued = 0;
671
672         mlog_entry_void();
673
674         w = ocfs2_new_net_wait_ctxt(response_id);
675         if (!w) {
676                 status = -ENOMEM;
677                 mlog_errno(status);
678                 goto bail;
679         }
680         w->n_callback = callback;
681
682         /* we're pretty much ready to go at this point, and this fills
683          * in n_response which we need anyway... */
684         ocfs2_queue_net_wait_ctxt(osb, w);
685
686         i = ocfs2_node_map_iterate(osb, &osb->mounted_map, 0);
687
688         while (i != O2NM_INVALID_NODE_NUM) {
689                 if (i != osb->node_num) {
690                         mlog(0, "trying to send request to node %i\n", i);
691                         ocfs2_node_map_set_bit(osb, &w->n_node_map, i);
692
693                         remote_err = 0;
694                         status = o2net_send_message(OCFS2_MESSAGE_TYPE_VOTE,
695                                                     osb->net_key,
696                                                     request,
697                                                     sizeof(*request),
698                                                     i,
699                                                     &remote_err);
700                         if (status == -ETIMEDOUT) {
701                                 mlog(0, "remote node %d timed out!\n", i);
702                                 status = -EAGAIN;
703                                 goto bail;
704                         }
705                         if (remote_err < 0) {
706                                 status = remote_err;
707                                 mlog(0, "remote error %d on node %d!\n",
708                                      remote_err, i);
709                                 mlog_errno(status);
710                                 goto bail;
711                         }
712                         if (status < 0) {
713                                 mlog_errno(status);
714                                 goto bail;
715                         }
716                 }
717                 i++;
718                 i = ocfs2_node_map_iterate(osb, &osb->mounted_map, i);
719                 mlog(0, "next is %d, i am %d\n", i, osb->node_num);
720         }
721         mlog(0, "done sending, now waiting on responses...\n");
722
723         wait_event(w->n_event, ocfs2_node_map_is_empty(osb, &w->n_node_map));
724
725         ocfs2_dequeue_net_wait_ctxt(osb, w);
726         dequeued = 1;
727
728         *response = w->n_response;
729         status = 0;
730 bail:
731         if (w) {
732                 if (!dequeued)
733                         ocfs2_dequeue_net_wait_ctxt(osb, w);
734                 kfree(w);
735         }
736
737         mlog_exit(status);
738         return status;
739 }
740
741 static struct ocfs2_vote_msg * ocfs2_new_vote_request(struct ocfs2_super *osb,
742                                                       u64 blkno,
743                                                       unsigned int generation,
744                                                       enum ocfs2_vote_request type,
745                                                       u32 priv)
746 {
747         struct ocfs2_vote_msg *request;
748         struct ocfs2_msg_hdr *hdr;
749
750         BUG_ON(!ocfs2_is_valid_vote_request(type));
751
752         request = kcalloc(1, sizeof(*request), GFP_KERNEL);
753         if (!request) {
754                 mlog_errno(-ENOMEM);
755         } else {
756                 hdr = &request->v_hdr;
757                 hdr->h_node_num = cpu_to_be32(osb->node_num);
758                 hdr->h_request = cpu_to_be32(type);
759                 hdr->h_blkno = cpu_to_be64(blkno);
760                 hdr->h_generation = cpu_to_be32(generation);
761
762                 request->md1.v_generic1 = cpu_to_be32(priv);
763         }
764
765         return request;
766 }
767
768 /* Complete the buildup of a new vote request and process the
769  * broadcast return value. */
770 static int ocfs2_do_request_vote(struct ocfs2_super *osb,
771                                  struct ocfs2_vote_msg *request,
772                                  struct ocfs2_net_response_cb *callback)
773 {
774         int status, response;
775         unsigned int response_id;
776         struct ocfs2_msg_hdr *hdr;
777
778         response_id = ocfs2_new_response_id(osb);
779
780         hdr = &request->v_hdr;
781         hdr->h_response_id = cpu_to_be32(response_id);
782
783         status = ocfs2_broadcast_vote(osb, request, response_id, &response,
784                                       callback);
785         if (status < 0) {
786                 mlog_errno(status);
787                 goto bail;
788         }
789
790         status = response;
791 bail:
792
793         return status;
794 }
795
796 static int ocfs2_request_vote(struct inode *inode,
797                               struct ocfs2_vote_msg *request,
798                               struct ocfs2_net_response_cb *callback)
799 {
800         int status;
801         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
802
803         if (ocfs2_inode_is_new(inode))
804                 return 0;
805
806         status = -EAGAIN;
807         while (status == -EAGAIN) {
808                 if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) &&
809                     signal_pending(current))
810                         return -ERESTARTSYS;
811
812                 status = ocfs2_super_lock(osb, 0);
813                 if (status < 0) {
814                         mlog_errno(status);
815                         break;
816                 }
817
818                 status = 0;
819                 if (!ocfs2_node_map_is_only(osb, &osb->mounted_map,
820                                            osb->node_num))
821                         status = ocfs2_do_request_vote(osb, request, callback);
822
823                 ocfs2_super_unlock(osb, 0);
824         }
825         return status;
826 }
827
828 static void ocfs2_delete_response_cb(void *priv,
829                                      struct ocfs2_response_msg *resp)
830 {
831         int orphaned_slot, node;
832         struct inode *inode = priv;
833
834         orphaned_slot = be32_to_cpu(resp->r_orphaned_slot);
835         node = be32_to_cpu(resp->r_hdr.h_node_num);
836         mlog(0, "node %d tells us that inode %llu is orphaned in slot %d\n",
837              node, (unsigned long long)OCFS2_I(inode)->ip_blkno,
838              orphaned_slot);
839
840         /* The other node may not actually know which slot the inode
841          * is orphaned in. */
842         if (orphaned_slot == OCFS2_INVALID_SLOT)
843                 return;
844
845         /* Ok, the responding node knows which slot this inode is
846          * orphaned in. We verify that the information is correct and
847          * then record this in the inode. ocfs2_delete_inode will use
848          * this information to determine which lock to take. */
849         spin_lock(&OCFS2_I(inode)->ip_lock);
850         mlog_bug_on_msg(OCFS2_I(inode)->ip_orphaned_slot != orphaned_slot &&
851                         OCFS2_I(inode)->ip_orphaned_slot
852                         != OCFS2_INVALID_SLOT, "Inode %llu: Node %d says it's "
853                         "orphaned in slot %d, we think it's in %d\n",
854                         (unsigned long long)OCFS2_I(inode)->ip_blkno,
855                         be32_to_cpu(resp->r_hdr.h_node_num),
856                         orphaned_slot, OCFS2_I(inode)->ip_orphaned_slot);
857
858         OCFS2_I(inode)->ip_orphaned_slot = orphaned_slot;
859         spin_unlock(&OCFS2_I(inode)->ip_lock);
860 }
861
862 int ocfs2_request_delete_vote(struct inode *inode)
863 {
864         int orphaned_slot, status;
865         struct ocfs2_net_response_cb delete_cb;
866         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
867         struct ocfs2_vote_msg *request;
868
869         spin_lock(&OCFS2_I(inode)->ip_lock);
870         orphaned_slot = OCFS2_I(inode)->ip_orphaned_slot;
871         spin_unlock(&OCFS2_I(inode)->ip_lock);
872
873         delete_cb.rc_cb = ocfs2_delete_response_cb;
874         delete_cb.rc_priv = inode;
875
876         mlog(0, "Inode %llu, we start thinking orphaned slot is %d\n",
877              (unsigned long long)OCFS2_I(inode)->ip_blkno, orphaned_slot);
878
879         status = -ENOMEM;
880         request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno,
881                                          inode->i_generation,
882                                          OCFS2_VOTE_REQ_DELETE, orphaned_slot);
883         if (request) {
884                 status = ocfs2_request_vote(inode, request, &delete_cb);
885
886                 kfree(request);
887         }
888
889         return status;
890 }
891
892 static void ocfs2_setup_unlink_vote(struct ocfs2_vote_msg *request,
893                                     struct dentry *dentry)
894 {
895         struct inode *parent = dentry->d_parent->d_inode;
896
897         /* We need some values which will uniquely identify a dentry
898          * on the other nodes so that they can find it and run
899          * d_delete against it. Parent directory block and full name
900          * should suffice. */
901
902         mlog(0, "unlink/rename request: parent: %llu name: %.*s\n",
903              (unsigned long long)OCFS2_I(parent)->ip_blkno, dentry->d_name.len,
904              dentry->d_name.name);
905
906         request->v_unlink_parent = cpu_to_be64(OCFS2_I(parent)->ip_blkno);
907         request->v_unlink_namelen = cpu_to_be32(dentry->d_name.len);
908         memcpy(request->v_unlink_dirent, dentry->d_name.name,
909                dentry->d_name.len);
910 }
911
912 int ocfs2_request_unlink_vote(struct inode *inode,
913                               struct dentry *dentry,
914                               unsigned int nlink)
915 {
916         int status;
917         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
918         struct ocfs2_vote_msg *request;
919
920         if (dentry->d_name.len > OCFS2_VOTE_FILENAME_LEN)
921                 return -ENAMETOOLONG;
922
923         status = -ENOMEM;
924         request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno,
925                                          inode->i_generation,
926                                          OCFS2_VOTE_REQ_UNLINK, nlink);
927         if (request) {
928                 ocfs2_setup_unlink_vote(request, dentry);
929
930                 status = ocfs2_request_vote(inode, request, NULL);
931
932                 kfree(request);
933         }
934         return status;
935 }
936
937 int ocfs2_request_rename_vote(struct inode *inode,
938                               struct dentry *dentry)
939 {
940         int status;
941         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
942         struct ocfs2_vote_msg *request;
943
944         if (dentry->d_name.len > OCFS2_VOTE_FILENAME_LEN)
945                 return -ENAMETOOLONG;
946
947         status = -ENOMEM;
948         request = ocfs2_new_vote_request(osb, OCFS2_I(inode)->ip_blkno,
949                                          inode->i_generation,
950                                          OCFS2_VOTE_REQ_RENAME, 0);
951         if (request) {
952                 ocfs2_setup_unlink_vote(request, dentry);
953
954                 status = ocfs2_request_vote(inode, request, NULL);
955
956                 kfree(request);
957         }
958         return status;
959 }
960
961 int ocfs2_request_mount_vote(struct ocfs2_super *osb)
962 {
963         int status;
964         struct ocfs2_vote_msg *request = NULL;
965
966         request = ocfs2_new_vote_request(osb, 0ULL, 0,
967                                          OCFS2_VOTE_REQ_MOUNT, 0);
968         if (!request) {
969                 status = -ENOMEM;
970                 goto bail;
971         }
972
973         status = -EAGAIN;
974         while (status == -EAGAIN) {
975                 if (!(osb->s_mount_opt & OCFS2_MOUNT_NOINTR) &&
976                     signal_pending(current)) {
977                         status = -ERESTARTSYS;
978                         goto bail;
979                 }
980
981                 if (ocfs2_node_map_is_only(osb, &osb->mounted_map,
982                                            osb->node_num)) {
983                         status = 0;
984                         goto bail;
985                 }
986
987                 status = ocfs2_do_request_vote(osb, request, NULL);
988         }
989
990 bail:
991         if (request)
992                 kfree(request);
993
994         return status;
995 }
996
997 int ocfs2_request_umount_vote(struct ocfs2_super *osb)
998 {
999         int status;
1000         struct ocfs2_vote_msg *request = NULL;
1001
1002         request = ocfs2_new_vote_request(osb, 0ULL, 0,
1003                                          OCFS2_VOTE_REQ_UMOUNT, 0);
1004         if (!request) {
1005                 status = -ENOMEM;
1006                 goto bail;
1007         }
1008
1009         status = -EAGAIN;
1010         while (status == -EAGAIN) {
1011                 /* Do not check signals on this vote... We really want
1012                  * this one to go all the way through. */
1013
1014                 if (ocfs2_node_map_is_only(osb, &osb->mounted_map,
1015                                            osb->node_num)) {
1016                         status = 0;
1017                         goto bail;
1018                 }
1019
1020                 status = ocfs2_do_request_vote(osb, request, NULL);
1021         }
1022
1023 bail:
1024         if (request)
1025                 kfree(request);
1026
1027         return status;
1028 }
1029
1030 /* TODO: This should eventually be a hash table! */
1031 static struct ocfs2_net_wait_ctxt * __ocfs2_find_net_wait_ctxt(struct ocfs2_super *osb,
1032                                                                u32 response_id)
1033 {
1034         struct list_head *p;
1035         struct ocfs2_net_wait_ctxt *w = NULL;
1036
1037         list_for_each(p, &osb->net_response_list) {
1038                 w = list_entry(p, struct ocfs2_net_wait_ctxt, n_list);
1039                 if (response_id == w->n_response_id)
1040                         break;
1041                 w = NULL;
1042         }
1043
1044         return w;
1045 }
1046
1047 /* Translate response codes into local node errno values */
1048 static inline int ocfs2_translate_response(int response)
1049 {
1050         int ret;
1051
1052         switch (response) {
1053         case OCFS2_RESPONSE_OK:
1054                 ret = 0;
1055                 break;
1056
1057         case OCFS2_RESPONSE_BUSY:
1058                 ret = -EBUSY;
1059                 break;
1060
1061         default:
1062                 ret = -EINVAL;
1063         }
1064
1065         return ret;
1066 }
1067
1068 static int ocfs2_handle_response_message(struct o2net_msg *msg,
1069                                          u32 len,
1070                                          void *data)
1071 {
1072         unsigned int response_id, node_num;
1073         int response_status;
1074         struct ocfs2_super *osb = data;
1075         struct ocfs2_response_msg *resp;
1076         struct ocfs2_net_wait_ctxt * w;
1077         struct ocfs2_net_response_cb *resp_cb;
1078
1079         resp = (struct ocfs2_response_msg *) msg->buf;
1080
1081         response_id = be32_to_cpu(resp->r_hdr.h_response_id);
1082         node_num = be32_to_cpu(resp->r_hdr.h_node_num);
1083         response_status = 
1084                 ocfs2_translate_response(be32_to_cpu(resp->r_response));
1085
1086         mlog(0, "received response message:\n");
1087         mlog(0, "h_response_id = %u\n", response_id);
1088         mlog(0, "h_request = %u\n", be32_to_cpu(resp->r_hdr.h_request));
1089         mlog(0, "h_blkno = %llu\n",
1090              (unsigned long long)be64_to_cpu(resp->r_hdr.h_blkno));
1091         mlog(0, "h_generation = %u\n", be32_to_cpu(resp->r_hdr.h_generation));
1092         mlog(0, "h_node_num = %u\n", node_num);
1093         mlog(0, "r_response = %d\n", response_status);
1094
1095         spin_lock(&osb->net_response_lock);
1096         w = __ocfs2_find_net_wait_ctxt(osb, response_id);
1097         if (!w) {
1098                 mlog(0, "request not found!\n");
1099                 goto bail;
1100         }
1101         resp_cb = w->n_callback;
1102
1103         if (response_status && (!w->n_response)) {
1104                 /* we only really need one negative response so don't
1105                  * set it twice. */
1106                 w->n_response = response_status;
1107         }
1108
1109         if (resp_cb) {
1110                 spin_unlock(&osb->net_response_lock);
1111
1112                 resp_cb->rc_cb(resp_cb->rc_priv, resp);
1113
1114                 spin_lock(&osb->net_response_lock);
1115         }
1116
1117         __ocfs2_mark_node_responded(osb, w, node_num);
1118 bail:
1119         spin_unlock(&osb->net_response_lock);
1120
1121         return 0;
1122 }
1123
1124 static int ocfs2_handle_vote_message(struct o2net_msg *msg,
1125                                      u32 len,
1126                                      void *data)
1127 {
1128         int status;
1129         struct ocfs2_super *osb = data;
1130         struct ocfs2_vote_work *work;
1131
1132         work = kmalloc(sizeof(struct ocfs2_vote_work), GFP_KERNEL);
1133         if (!work) {
1134                 status = -ENOMEM;
1135                 mlog_errno(status);
1136                 goto bail;
1137         }
1138
1139         INIT_LIST_HEAD(&work->w_list);
1140         memcpy(&work->w_msg, msg->buf, sizeof(struct ocfs2_vote_msg));
1141
1142         mlog(0, "scheduling vote request:\n");
1143         mlog(0, "h_response_id = %u\n",
1144              be32_to_cpu(work->w_msg.v_hdr.h_response_id));
1145         mlog(0, "h_request = %u\n", be32_to_cpu(work->w_msg.v_hdr.h_request));
1146         mlog(0, "h_blkno = %llu\n",
1147              (unsigned long long)be64_to_cpu(work->w_msg.v_hdr.h_blkno));
1148         mlog(0, "h_generation = %u\n",
1149              be32_to_cpu(work->w_msg.v_hdr.h_generation));
1150         mlog(0, "h_node_num = %u\n",
1151              be32_to_cpu(work->w_msg.v_hdr.h_node_num));
1152         mlog(0, "v_generic1 = %u\n", be32_to_cpu(work->w_msg.md1.v_generic1));
1153
1154         spin_lock(&osb->vote_task_lock);
1155         list_add_tail(&work->w_list, &osb->vote_list);
1156         osb->vote_count++;
1157         spin_unlock(&osb->vote_task_lock);
1158
1159         ocfs2_kick_vote_thread(osb);
1160
1161         status = 0;
1162 bail:
1163         return status;
1164 }
1165
1166 void ocfs2_unregister_net_handlers(struct ocfs2_super *osb)
1167 {
1168         if (!osb->net_key)
1169                 return;
1170
1171         o2net_unregister_handler_list(&osb->osb_net_handlers);
1172
1173         if (!list_empty(&osb->net_response_list))
1174                 mlog(ML_ERROR, "net response list not empty!\n");
1175
1176         osb->net_key = 0;
1177 }
1178
1179 int ocfs2_register_net_handlers(struct ocfs2_super *osb)
1180 {
1181         int status = 0;
1182
1183         status = o2net_register_handler(OCFS2_MESSAGE_TYPE_RESPONSE,
1184                                         osb->net_key,
1185                                         sizeof(struct ocfs2_response_msg),
1186                                         ocfs2_handle_response_message,
1187                                         osb, &osb->osb_net_handlers);
1188         if (status) {
1189                 mlog_errno(status);
1190                 goto bail;
1191         }
1192
1193         status = o2net_register_handler(OCFS2_MESSAGE_TYPE_VOTE,
1194                                         osb->net_key,
1195                                         sizeof(struct ocfs2_vote_msg),
1196                                         ocfs2_handle_vote_message,
1197                                         osb, &osb->osb_net_handlers);
1198         if (status) {
1199                 mlog_errno(status);
1200                 goto bail;
1201         }
1202 bail:
1203         if (status < 0)
1204                 ocfs2_unregister_net_handlers(osb);
1205
1206         return status;
1207 }