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Commit | Line | Data |
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9cc6fc50 DH |
1 | /* Handle fileserver selection and rotation. |
2 | * | |
3 | * Copyright (C) 2017 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/slab.h> | |
d2ddc776 DH |
14 | #include <linux/fs.h> |
15 | #include <linux/sched.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/sched/signal.h> | |
9cc6fc50 | 18 | #include "internal.h" |
d2ddc776 | 19 | #include "afs_fs.h" |
9cc6fc50 | 20 | |
d2ddc776 DH |
21 | /* |
22 | * Begin an operation on the fileserver. | |
23 | * | |
24 | * Fileserver operations are serialised on the server by vnode, so we serialise | |
25 | * them here also using the io_lock. | |
26 | */ | |
27 | bool afs_begin_vnode_operation(struct afs_fs_cursor *fc, struct afs_vnode *vnode, | |
20b8391f | 28 | struct key *key, bool intr) |
d2ddc776 | 29 | { |
3bf0fb6f | 30 | memset(fc, 0, sizeof(*fc)); |
d2ddc776 DH |
31 | fc->vnode = vnode; |
32 | fc->key = key; | |
33 | fc->ac.error = SHRT_MAX; | |
e7f680f4 | 34 | fc->error = -EDESTADDRREQ; |
d2ddc776 | 35 | |
20b8391f DH |
36 | if (intr) { |
37 | fc->flags |= AFS_FS_CURSOR_INTR; | |
38 | if (mutex_lock_interruptible(&vnode->io_lock) < 0) { | |
39 | fc->error = -EINTR; | |
40 | fc->flags |= AFS_FS_CURSOR_STOP; | |
41 | return false; | |
42 | } | |
43 | } else { | |
44 | mutex_lock(&vnode->io_lock); | |
d2ddc776 DH |
45 | } |
46 | ||
0fafdc9f | 47 | if (vnode->lock_state != AFS_VNODE_LOCK_NONE) |
d2ddc776 DH |
48 | fc->flags |= AFS_FS_CURSOR_CUR_ONLY; |
49 | return true; | |
50 | } | |
51 | ||
52 | /* | |
53 | * Begin iteration through a server list, starting with the vnode's last used | |
54 | * server if possible, or the last recorded good server if not. | |
55 | */ | |
56 | static bool afs_start_fs_iteration(struct afs_fs_cursor *fc, | |
57 | struct afs_vnode *vnode) | |
58 | { | |
59 | struct afs_cb_interest *cbi; | |
60 | int i; | |
61 | ||
62 | read_lock(&vnode->volume->servers_lock); | |
63 | fc->server_list = afs_get_serverlist(vnode->volume->servers); | |
64 | read_unlock(&vnode->volume->servers_lock); | |
65 | ||
3bf0fb6f DH |
66 | fc->untried = (1UL << fc->server_list->nr_servers) - 1; |
67 | fc->index = READ_ONCE(fc->server_list->preferred); | |
68 | ||
f642404a DH |
69 | cbi = rcu_dereference_protected(vnode->cb_interest, |
70 | lockdep_is_held(&vnode->io_lock)); | |
d2ddc776 DH |
71 | if (cbi) { |
72 | /* See if the vnode's preferred record is still available */ | |
73 | for (i = 0; i < fc->server_list->nr_servers; i++) { | |
74 | if (fc->server_list->servers[i].cb_interest == cbi) { | |
3bf0fb6f | 75 | fc->index = i; |
d2ddc776 DH |
76 | goto found_interest; |
77 | } | |
78 | } | |
79 | ||
80 | /* If we have a lock outstanding on a server that's no longer | |
81 | * serving this vnode, then we can't switch to another server | |
82 | * and have to return an error. | |
83 | */ | |
84 | if (fc->flags & AFS_FS_CURSOR_CUR_ONLY) { | |
e7f680f4 | 85 | fc->error = -ESTALE; |
d2ddc776 DH |
86 | return false; |
87 | } | |
88 | ||
89 | /* Note that the callback promise is effectively broken */ | |
90 | write_seqlock(&vnode->cb_lock); | |
f642404a DH |
91 | ASSERTCMP(cbi, ==, rcu_access_pointer(vnode->cb_interest)); |
92 | rcu_assign_pointer(vnode->cb_interest, NULL); | |
d2ddc776 DH |
93 | if (test_and_clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) |
94 | vnode->cb_break++; | |
95 | write_sequnlock(&vnode->cb_lock); | |
96 | ||
97 | afs_put_cb_interest(afs_v2net(vnode), cbi); | |
98 | cbi = NULL; | |
d2ddc776 DH |
99 | } |
100 | ||
101 | found_interest: | |
d2ddc776 DH |
102 | return true; |
103 | } | |
104 | ||
105 | /* | |
106 | * Post volume busy note. | |
107 | */ | |
108 | static void afs_busy(struct afs_volume *volume, u32 abort_code) | |
109 | { | |
110 | const char *m; | |
111 | ||
112 | switch (abort_code) { | |
113 | case VOFFLINE: m = "offline"; break; | |
114 | case VRESTARTING: m = "restarting"; break; | |
115 | case VSALVAGING: m = "being salvaged"; break; | |
116 | default: m = "busy"; break; | |
117 | } | |
0fafdc9f | 118 | |
3b6492df | 119 | pr_notice("kAFS: Volume %llu '%s' is %s\n", volume->vid, volume->name, m); |
d2ddc776 DH |
120 | } |
121 | ||
122 | /* | |
123 | * Sleep and retry the operation to the same fileserver. | |
124 | */ | |
125 | static bool afs_sleep_and_retry(struct afs_fs_cursor *fc) | |
126 | { | |
20b8391f DH |
127 | if (fc->flags & AFS_FS_CURSOR_INTR) { |
128 | msleep_interruptible(1000); | |
129 | if (signal_pending(current)) { | |
130 | fc->error = -ERESTARTSYS; | |
131 | return false; | |
132 | } | |
133 | } else { | |
134 | msleep(1000); | |
d2ddc776 DH |
135 | } |
136 | ||
137 | return true; | |
138 | } | |
139 | ||
140 | /* | |
141 | * Select the fileserver to use. May be called multiple times to rotate | |
142 | * through the fileservers. | |
143 | */ | |
144 | bool afs_select_fileserver(struct afs_fs_cursor *fc) | |
145 | { | |
146 | struct afs_addr_list *alist; | |
147 | struct afs_server *server; | |
148 | struct afs_vnode *vnode = fc->vnode; | |
4584ae96 DH |
149 | struct afs_error e; |
150 | u32 rtt; | |
3bf0fb6f | 151 | int error = fc->ac.error, i; |
d2ddc776 | 152 | |
3bf0fb6f DH |
153 | _enter("%lx[%d],%lx[%d],%d,%d", |
154 | fc->untried, fc->index, | |
155 | fc->ac.tried, fc->ac.index, | |
e7f680f4 | 156 | error, fc->ac.abort_code); |
d2ddc776 DH |
157 | |
158 | if (fc->flags & AFS_FS_CURSOR_STOP) { | |
159 | _leave(" = f [stopped]"); | |
160 | return false; | |
161 | } | |
162 | ||
744bcd71 DH |
163 | fc->nr_iterations++; |
164 | ||
d2ddc776 | 165 | /* Evaluate the result of the previous operation, if there was one. */ |
e7f680f4 | 166 | switch (error) { |
d2ddc776 DH |
167 | case SHRT_MAX: |
168 | goto start; | |
169 | ||
170 | case 0: | |
171 | default: | |
172 | /* Success or local failure. Stop. */ | |
e7f680f4 | 173 | fc->error = error; |
d2ddc776 | 174 | fc->flags |= AFS_FS_CURSOR_STOP; |
e7f680f4 | 175 | _leave(" = f [okay/local %d]", error); |
d2ddc776 DH |
176 | return false; |
177 | ||
178 | case -ECONNABORTED: | |
179 | /* The far side rejected the operation on some grounds. This | |
180 | * might involve the server being busy or the volume having been moved. | |
181 | */ | |
182 | switch (fc->ac.abort_code) { | |
183 | case VNOVOL: | |
184 | /* This fileserver doesn't know about the volume. | |
185 | * - May indicate that the VL is wrong - retry once and compare | |
186 | * the results. | |
187 | * - May indicate that the fileserver couldn't attach to the vol. | |
188 | */ | |
189 | if (fc->flags & AFS_FS_CURSOR_VNOVOL) { | |
e7f680f4 | 190 | fc->error = -EREMOTEIO; |
3d9fa911 | 191 | goto next_server; |
d2ddc776 DH |
192 | } |
193 | ||
194 | write_lock(&vnode->volume->servers_lock); | |
195 | fc->server_list->vnovol_mask |= 1 << fc->index; | |
196 | write_unlock(&vnode->volume->servers_lock); | |
197 | ||
198 | set_bit(AFS_VOLUME_NEEDS_UPDATE, &vnode->volume->flags); | |
e7f680f4 DH |
199 | error = afs_check_volume_status(vnode->volume, fc->key); |
200 | if (error < 0) | |
201 | goto failed_set_error; | |
d2ddc776 DH |
202 | |
203 | if (test_bit(AFS_VOLUME_DELETED, &vnode->volume->flags)) { | |
e7f680f4 | 204 | fc->error = -ENOMEDIUM; |
d2ddc776 DH |
205 | goto failed; |
206 | } | |
207 | ||
208 | /* If the server list didn't change, then assume that | |
209 | * it's the fileserver having trouble. | |
210 | */ | |
211 | if (vnode->volume->servers == fc->server_list) { | |
e7f680f4 | 212 | fc->error = -EREMOTEIO; |
3d9fa911 | 213 | goto next_server; |
d2ddc776 DH |
214 | } |
215 | ||
216 | /* Try again */ | |
217 | fc->flags |= AFS_FS_CURSOR_VNOVOL; | |
218 | _leave(" = t [vnovol]"); | |
219 | return true; | |
220 | ||
221 | case VSALVAGE: /* TODO: Should this return an error or iterate? */ | |
222 | case VVOLEXISTS: | |
223 | case VNOSERVICE: | |
224 | case VONLINE: | |
225 | case VDISKFULL: | |
226 | case VOVERQUOTA: | |
e7f680f4 | 227 | fc->error = afs_abort_to_error(fc->ac.abort_code); |
d2ddc776 DH |
228 | goto next_server; |
229 | ||
230 | case VOFFLINE: | |
231 | if (!test_and_set_bit(AFS_VOLUME_OFFLINE, &vnode->volume->flags)) { | |
232 | afs_busy(vnode->volume, fc->ac.abort_code); | |
233 | clear_bit(AFS_VOLUME_BUSY, &vnode->volume->flags); | |
234 | } | |
235 | if (fc->flags & AFS_FS_CURSOR_NO_VSLEEP) { | |
e7f680f4 | 236 | fc->error = -EADV; |
d2ddc776 DH |
237 | goto failed; |
238 | } | |
239 | if (fc->flags & AFS_FS_CURSOR_CUR_ONLY) { | |
e7f680f4 | 240 | fc->error = -ESTALE; |
d2ddc776 DH |
241 | goto failed; |
242 | } | |
243 | goto busy; | |
244 | ||
245 | case VSALVAGING: | |
246 | case VRESTARTING: | |
247 | case VBUSY: | |
248 | /* Retry after going round all the servers unless we | |
249 | * have a file lock we need to maintain. | |
250 | */ | |
251 | if (fc->flags & AFS_FS_CURSOR_NO_VSLEEP) { | |
e7f680f4 | 252 | fc->error = -EBUSY; |
d2ddc776 DH |
253 | goto failed; |
254 | } | |
255 | if (!test_and_set_bit(AFS_VOLUME_BUSY, &vnode->volume->flags)) { | |
256 | afs_busy(vnode->volume, fc->ac.abort_code); | |
257 | clear_bit(AFS_VOLUME_OFFLINE, &vnode->volume->flags); | |
258 | } | |
259 | busy: | |
260 | if (fc->flags & AFS_FS_CURSOR_CUR_ONLY) { | |
261 | if (!afs_sleep_and_retry(fc)) | |
262 | goto failed; | |
263 | ||
264 | /* Retry with same server & address */ | |
265 | _leave(" = t [vbusy]"); | |
266 | return true; | |
267 | } | |
268 | ||
269 | fc->flags |= AFS_FS_CURSOR_VBUSY; | |
270 | goto next_server; | |
271 | ||
272 | case VMOVED: | |
273 | /* The volume migrated to another server. We consider | |
274 | * consider all locks and callbacks broken and request | |
275 | * an update from the VLDB. | |
276 | * | |
277 | * We also limit the number of VMOVED hops we will | |
278 | * honour, just in case someone sets up a loop. | |
279 | */ | |
280 | if (fc->flags & AFS_FS_CURSOR_VMOVED) { | |
e7f680f4 | 281 | fc->error = -EREMOTEIO; |
d2ddc776 DH |
282 | goto failed; |
283 | } | |
284 | fc->flags |= AFS_FS_CURSOR_VMOVED; | |
285 | ||
286 | set_bit(AFS_VOLUME_WAIT, &vnode->volume->flags); | |
287 | set_bit(AFS_VOLUME_NEEDS_UPDATE, &vnode->volume->flags); | |
e7f680f4 DH |
288 | error = afs_check_volume_status(vnode->volume, fc->key); |
289 | if (error < 0) | |
290 | goto failed_set_error; | |
d2ddc776 DH |
291 | |
292 | /* If the server list didn't change, then the VLDB is | |
293 | * out of sync with the fileservers. This is hopefully | |
294 | * a temporary condition, however, so we don't want to | |
295 | * permanently block access to the file. | |
296 | * | |
297 | * TODO: Try other fileservers if we can. | |
298 | * | |
299 | * TODO: Retry a few times with sleeps. | |
300 | */ | |
301 | if (vnode->volume->servers == fc->server_list) { | |
e7f680f4 | 302 | fc->error = -ENOMEDIUM; |
d2ddc776 DH |
303 | goto failed; |
304 | } | |
305 | ||
306 | goto restart_from_beginning; | |
307 | ||
308 | default: | |
309 | clear_bit(AFS_VOLUME_OFFLINE, &vnode->volume->flags); | |
310 | clear_bit(AFS_VOLUME_BUSY, &vnode->volume->flags); | |
e7f680f4 | 311 | fc->error = afs_abort_to_error(fc->ac.abort_code); |
d2ddc776 DH |
312 | goto failed; |
313 | } | |
314 | ||
e7f680f4 DH |
315 | case -ETIMEDOUT: |
316 | case -ETIME: | |
317 | if (fc->error != -EDESTADDRREQ) | |
318 | goto iterate_address; | |
319 | /* Fall through */ | |
4584ae96 DH |
320 | case -ERFKILL: |
321 | case -EADDRNOTAVAIL: | |
d2ddc776 DH |
322 | case -ENETUNREACH: |
323 | case -EHOSTUNREACH: | |
4584ae96 | 324 | case -EHOSTDOWN: |
d2ddc776 | 325 | case -ECONNREFUSED: |
d2ddc776 | 326 | _debug("no conn"); |
e7f680f4 | 327 | fc->error = error; |
d2ddc776 | 328 | goto iterate_address; |
1a025028 DH |
329 | |
330 | case -ECONNRESET: | |
331 | _debug("call reset"); | |
e7f680f4 | 332 | fc->error = error; |
1a025028 | 333 | goto failed; |
d2ddc776 DH |
334 | } |
335 | ||
336 | restart_from_beginning: | |
337 | _debug("restart"); | |
338 | afs_end_cursor(&fc->ac); | |
339 | afs_put_cb_interest(afs_v2net(vnode), fc->cbi); | |
340 | fc->cbi = NULL; | |
341 | afs_put_serverlist(afs_v2net(vnode), fc->server_list); | |
342 | fc->server_list = NULL; | |
343 | start: | |
344 | _debug("start"); | |
345 | /* See if we need to do an update of the volume record. Note that the | |
346 | * volume may have moved or even have been deleted. | |
347 | */ | |
e7f680f4 DH |
348 | error = afs_check_volume_status(vnode->volume, fc->key); |
349 | if (error < 0) | |
350 | goto failed_set_error; | |
d2ddc776 DH |
351 | |
352 | if (!afs_start_fs_iteration(fc, vnode)) | |
353 | goto failed; | |
d2ddc776 | 354 | |
3bf0fb6f DH |
355 | _debug("__ VOL %llx __", vnode->volume->vid); |
356 | error = afs_probe_fileservers(afs_v2net(vnode), fc->key, fc->server_list); | |
357 | if (error < 0) | |
358 | goto failed_set_error; | |
359 | ||
360 | pick_server: | |
361 | _debug("pick [%lx]", fc->untried); | |
362 | ||
363 | error = afs_wait_for_fs_probes(fc->server_list, fc->untried); | |
364 | if (error < 0) | |
365 | goto failed_set_error; | |
366 | ||
367 | /* Pick the untried server with the lowest RTT. If we have outstanding | |
368 | * callbacks, we stick with the server we're already using if we can. | |
369 | */ | |
370 | if (fc->cbi) { | |
371 | _debug("cbi %u", fc->index); | |
372 | if (test_bit(fc->index, &fc->untried)) | |
373 | goto selected_server; | |
374 | afs_put_cb_interest(afs_v2net(vnode), fc->cbi); | |
375 | fc->cbi = NULL; | |
376 | _debug("nocbi"); | |
377 | } | |
378 | ||
379 | fc->index = -1; | |
380 | rtt = U32_MAX; | |
381 | for (i = 0; i < fc->server_list->nr_servers; i++) { | |
382 | struct afs_server *s = fc->server_list->servers[i].server; | |
383 | ||
384 | if (!test_bit(i, &fc->untried) || !s->probe.responded) | |
385 | continue; | |
386 | if (s->probe.rtt < rtt) { | |
387 | fc->index = i; | |
388 | rtt = s->probe.rtt; | |
389 | } | |
390 | } | |
391 | ||
392 | if (fc->index == -1) | |
393 | goto no_more_servers; | |
394 | ||
395 | selected_server: | |
396 | _debug("use %d", fc->index); | |
397 | __clear_bit(fc->index, &fc->untried); | |
398 | ||
d2ddc776 DH |
399 | /* We're starting on a different fileserver from the list. We need to |
400 | * check it, create a callback intercept, find its address list and | |
401 | * probe its capabilities before we use it. | |
402 | */ | |
403 | ASSERTCMP(fc->ac.alist, ==, NULL); | |
404 | server = fc->server_list->servers[fc->index].server; | |
405 | ||
406 | if (!afs_check_server_record(fc, server)) | |
407 | goto failed; | |
408 | ||
409 | _debug("USING SERVER: %pU", &server->uuid); | |
410 | ||
411 | /* Make sure we've got a callback interest record for this server. We | |
412 | * have to link it in before we send the request as we can be sent a | |
413 | * break request before we've finished decoding the reply and | |
414 | * installing the vnode. | |
415 | */ | |
e7f680f4 DH |
416 | error = afs_register_server_cb_interest(vnode, fc->server_list, |
417 | fc->index); | |
418 | if (error < 0) | |
419 | goto failed_set_error; | |
d2ddc776 | 420 | |
f642404a DH |
421 | fc->cbi = afs_get_cb_interest( |
422 | rcu_dereference_protected(vnode->cb_interest, | |
423 | lockdep_is_held(&vnode->io_lock))); | |
d2ddc776 DH |
424 | |
425 | read_lock(&server->fs_lock); | |
426 | alist = rcu_dereference_protected(server->addresses, | |
427 | lockdep_is_held(&server->fs_lock)); | |
428 | afs_get_addrlist(alist); | |
429 | read_unlock(&server->fs_lock); | |
430 | ||
8305e579 | 431 | memset(&fc->ac, 0, sizeof(fc->ac)); |
d2ddc776 | 432 | |
d2ddc776 DH |
433 | if (!fc->ac.alist) |
434 | fc->ac.alist = alist; | |
435 | else | |
436 | afs_put_addrlist(alist); | |
437 | ||
3bf0fb6f | 438 | fc->ac.index = -1; |
d2ddc776 DH |
439 | |
440 | iterate_address: | |
441 | ASSERT(fc->ac.alist); | |
d2ddc776 DH |
442 | /* Iterate over the current server's address list to try and find an |
443 | * address on which it will respond to us. | |
444 | */ | |
fe4d774c DH |
445 | if (!afs_iterate_addresses(&fc->ac)) |
446 | goto next_server; | |
d2ddc776 | 447 | |
3bf0fb6f DH |
448 | _debug("address [%u] %u/%u", fc->index, fc->ac.index, fc->ac.alist->nr_addrs); |
449 | ||
fe4d774c DH |
450 | _leave(" = t"); |
451 | return true; | |
d2ddc776 | 452 | |
16280a15 DH |
453 | next_server: |
454 | _debug("next"); | |
455 | afs_end_cursor(&fc->ac); | |
3bf0fb6f | 456 | goto pick_server; |
16280a15 | 457 | |
3bf0fb6f | 458 | no_more_servers: |
16280a15 DH |
459 | /* That's all the servers poked to no good effect. Try again if some |
460 | * of them were busy. | |
461 | */ | |
462 | if (fc->flags & AFS_FS_CURSOR_VBUSY) | |
463 | goto restart_from_beginning; | |
464 | ||
4584ae96 DH |
465 | e.error = -EDESTADDRREQ; |
466 | e.responded = false; | |
3bf0fb6f DH |
467 | for (i = 0; i < fc->server_list->nr_servers; i++) { |
468 | struct afs_server *s = fc->server_list->servers[i].server; | |
3bf0fb6f | 469 | |
4584ae96 DH |
470 | afs_prioritise_error(&e, READ_ONCE(s->probe.error), |
471 | s->probe.abort_code); | |
3bf0fb6f DH |
472 | } |
473 | ||
51eba999 DH |
474 | error = e.error; |
475 | ||
e7f680f4 DH |
476 | failed_set_error: |
477 | fc->error = error; | |
d2ddc776 DH |
478 | failed: |
479 | fc->flags |= AFS_FS_CURSOR_STOP; | |
fe4d774c | 480 | afs_end_cursor(&fc->ac); |
e7f680f4 | 481 | _leave(" = f [failed %d]", fc->error); |
d2ddc776 DH |
482 | return false; |
483 | } | |
484 | ||
485 | /* | |
486 | * Select the same fileserver we used for a vnode before and only that | |
487 | * fileserver. We use this when we have a lock on that file, which is backed | |
488 | * only by the fileserver we obtained it from. | |
489 | */ | |
490 | bool afs_select_current_fileserver(struct afs_fs_cursor *fc) | |
491 | { | |
492 | struct afs_vnode *vnode = fc->vnode; | |
f642404a | 493 | struct afs_cb_interest *cbi; |
d2ddc776 | 494 | struct afs_addr_list *alist; |
e7f680f4 | 495 | int error = fc->ac.error; |
d2ddc776 DH |
496 | |
497 | _enter(""); | |
498 | ||
f642404a DH |
499 | cbi = rcu_dereference_protected(vnode->cb_interest, |
500 | lockdep_is_held(&vnode->io_lock)); | |
501 | ||
e7f680f4 | 502 | switch (error) { |
0fafdc9f DH |
503 | case SHRT_MAX: |
504 | if (!cbi) { | |
e7f680f4 | 505 | fc->error = -ESTALE; |
0fafdc9f DH |
506 | fc->flags |= AFS_FS_CURSOR_STOP; |
507 | return false; | |
508 | } | |
509 | ||
f642404a | 510 | fc->cbi = afs_get_cb_interest(cbi); |
0fafdc9f DH |
511 | |
512 | read_lock(&cbi->server->fs_lock); | |
513 | alist = rcu_dereference_protected(cbi->server->addresses, | |
514 | lockdep_is_held(&cbi->server->fs_lock)); | |
515 | afs_get_addrlist(alist); | |
516 | read_unlock(&cbi->server->fs_lock); | |
517 | if (!alist) { | |
e7f680f4 | 518 | fc->error = -ESTALE; |
0fafdc9f DH |
519 | fc->flags |= AFS_FS_CURSOR_STOP; |
520 | return false; | |
521 | } | |
522 | ||
8305e579 | 523 | memset(&fc->ac, 0, sizeof(fc->ac)); |
0fafdc9f | 524 | fc->ac.alist = alist; |
3bf0fb6f | 525 | fc->ac.index = -1; |
0fafdc9f DH |
526 | goto iterate_address; |
527 | ||
528 | case 0: | |
529 | default: | |
530 | /* Success or local failure. Stop. */ | |
e7f680f4 | 531 | fc->error = error; |
d2ddc776 | 532 | fc->flags |= AFS_FS_CURSOR_STOP; |
e7f680f4 | 533 | _leave(" = f [okay/local %d]", error); |
d2ddc776 | 534 | return false; |
d2ddc776 | 535 | |
0fafdc9f | 536 | case -ECONNABORTED: |
e7f680f4 | 537 | fc->error = afs_abort_to_error(fc->ac.abort_code); |
d2ddc776 | 538 | fc->flags |= AFS_FS_CURSOR_STOP; |
0fafdc9f | 539 | _leave(" = f [abort]"); |
d2ddc776 | 540 | return false; |
0fafdc9f | 541 | |
4584ae96 DH |
542 | case -ERFKILL: |
543 | case -EADDRNOTAVAIL: | |
0fafdc9f DH |
544 | case -ENETUNREACH: |
545 | case -EHOSTUNREACH: | |
4584ae96 | 546 | case -EHOSTDOWN: |
0fafdc9f DH |
547 | case -ECONNREFUSED: |
548 | case -ETIMEDOUT: | |
549 | case -ETIME: | |
550 | _debug("no conn"); | |
e7f680f4 | 551 | fc->error = error; |
0fafdc9f | 552 | goto iterate_address; |
d2ddc776 DH |
553 | } |
554 | ||
0fafdc9f DH |
555 | iterate_address: |
556 | /* Iterate over the current server's address list to try and find an | |
557 | * address on which it will respond to us. | |
558 | */ | |
559 | if (afs_iterate_addresses(&fc->ac)) { | |
560 | _leave(" = t"); | |
561 | return true; | |
562 | } | |
563 | ||
564 | afs_end_cursor(&fc->ac); | |
565 | return false; | |
d2ddc776 DH |
566 | } |
567 | ||
744bcd71 DH |
568 | /* |
569 | * Dump cursor state in the case of the error being EDESTADDRREQ. | |
570 | */ | |
571 | static void afs_dump_edestaddrreq(const struct afs_fs_cursor *fc) | |
572 | { | |
573 | static int count; | |
574 | int i; | |
575 | ||
576 | if (!IS_ENABLED(CONFIG_AFS_DEBUG_CURSOR) || count > 3) | |
577 | return; | |
578 | count++; | |
579 | ||
580 | rcu_read_lock(); | |
581 | ||
582 | pr_notice("EDESTADDR occurred\n"); | |
583 | pr_notice("FC: cbb=%x cbb2=%x fl=%hx err=%hd\n", | |
584 | fc->cb_break, fc->cb_break_2, fc->flags, fc->error); | |
3bf0fb6f DH |
585 | pr_notice("FC: ut=%lx ix=%d ni=%u\n", |
586 | fc->untried, fc->index, fc->nr_iterations); | |
744bcd71 DH |
587 | |
588 | if (fc->server_list) { | |
589 | const struct afs_server_list *sl = fc->server_list; | |
3bf0fb6f DH |
590 | pr_notice("FC: SL nr=%u pr=%u vnov=%hx\n", |
591 | sl->nr_servers, sl->preferred, sl->vnovol_mask); | |
744bcd71 DH |
592 | for (i = 0; i < sl->nr_servers; i++) { |
593 | const struct afs_server *s = sl->servers[i].server; | |
594 | pr_notice("FC: server fl=%lx av=%u %pU\n", | |
595 | s->flags, s->addr_version, &s->uuid); | |
596 | if (s->addresses) { | |
597 | const struct afs_addr_list *a = | |
598 | rcu_dereference(s->addresses); | |
3bf0fb6f | 599 | pr_notice("FC: - av=%u nr=%u/%u/%u pr=%u\n", |
744bcd71 DH |
600 | a->version, |
601 | a->nr_ipv4, a->nr_addrs, a->max_addrs, | |
3bf0fb6f DH |
602 | a->preferred); |
603 | pr_notice("FC: - pr=%lx R=%lx F=%lx\n", | |
604 | a->probed, a->responded, a->failed); | |
744bcd71 DH |
605 | if (a == fc->ac.alist) |
606 | pr_notice("FC: - current\n"); | |
607 | } | |
608 | } | |
609 | } | |
610 | ||
3bf0fb6f DH |
611 | pr_notice("AC: t=%lx ax=%u ac=%d er=%d r=%u ni=%u\n", |
612 | fc->ac.tried, fc->ac.index, fc->ac.abort_code, fc->ac.error, | |
613 | fc->ac.responded, fc->ac.nr_iterations); | |
744bcd71 DH |
614 | rcu_read_unlock(); |
615 | } | |
616 | ||
d2ddc776 DH |
617 | /* |
618 | * Tidy up a filesystem cursor and unlock the vnode. | |
619 | */ | |
620 | int afs_end_vnode_operation(struct afs_fs_cursor *fc) | |
621 | { | |
622 | struct afs_net *net = afs_v2net(fc->vnode); | |
d2ddc776 | 623 | |
744bcd71 | 624 | if (fc->error == -EDESTADDRREQ || |
4584ae96 | 625 | fc->error == -EADDRNOTAVAIL || |
744bcd71 DH |
626 | fc->error == -ENETUNREACH || |
627 | fc->error == -EHOSTUNREACH) | |
628 | afs_dump_edestaddrreq(fc); | |
629 | ||
d2ddc776 DH |
630 | mutex_unlock(&fc->vnode->io_lock); |
631 | ||
632 | afs_end_cursor(&fc->ac); | |
633 | afs_put_cb_interest(net, fc->cbi); | |
634 | afs_put_serverlist(net, fc->server_list); | |
635 | ||
e7f680f4 DH |
636 | if (fc->error == -ECONNABORTED) |
637 | fc->error = afs_abort_to_error(fc->ac.abort_code); | |
d2ddc776 | 638 | |
e7f680f4 | 639 | return fc->error; |
d2ddc776 | 640 | } |