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, | |
28 | struct key *key) | |
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 DH |
35 | |
36 | if (mutex_lock_interruptible(&vnode->io_lock) < 0) { | |
e7f680f4 | 37 | fc->error = -EINTR; |
d2ddc776 DH |
38 | fc->flags |= AFS_FS_CURSOR_STOP; |
39 | return false; | |
40 | } | |
41 | ||
0fafdc9f | 42 | if (vnode->lock_state != AFS_VNODE_LOCK_NONE) |
d2ddc776 DH |
43 | fc->flags |= AFS_FS_CURSOR_CUR_ONLY; |
44 | return true; | |
45 | } | |
46 | ||
47 | /* | |
48 | * Begin iteration through a server list, starting with the vnode's last used | |
49 | * server if possible, or the last recorded good server if not. | |
50 | */ | |
51 | static bool afs_start_fs_iteration(struct afs_fs_cursor *fc, | |
52 | struct afs_vnode *vnode) | |
53 | { | |
54 | struct afs_cb_interest *cbi; | |
55 | int i; | |
56 | ||
57 | read_lock(&vnode->volume->servers_lock); | |
58 | fc->server_list = afs_get_serverlist(vnode->volume->servers); | |
59 | read_unlock(&vnode->volume->servers_lock); | |
60 | ||
3bf0fb6f DH |
61 | fc->untried = (1UL << fc->server_list->nr_servers) - 1; |
62 | fc->index = READ_ONCE(fc->server_list->preferred); | |
63 | ||
d2ddc776 DH |
64 | cbi = vnode->cb_interest; |
65 | if (cbi) { | |
66 | /* See if the vnode's preferred record is still available */ | |
67 | for (i = 0; i < fc->server_list->nr_servers; i++) { | |
68 | if (fc->server_list->servers[i].cb_interest == cbi) { | |
3bf0fb6f | 69 | fc->index = i; |
d2ddc776 DH |
70 | goto found_interest; |
71 | } | |
72 | } | |
73 | ||
74 | /* If we have a lock outstanding on a server that's no longer | |
75 | * serving this vnode, then we can't switch to another server | |
76 | * and have to return an error. | |
77 | */ | |
78 | if (fc->flags & AFS_FS_CURSOR_CUR_ONLY) { | |
e7f680f4 | 79 | fc->error = -ESTALE; |
d2ddc776 DH |
80 | return false; |
81 | } | |
82 | ||
83 | /* Note that the callback promise is effectively broken */ | |
84 | write_seqlock(&vnode->cb_lock); | |
85 | ASSERTCMP(cbi, ==, vnode->cb_interest); | |
86 | vnode->cb_interest = NULL; | |
87 | if (test_and_clear_bit(AFS_VNODE_CB_PROMISED, &vnode->flags)) | |
88 | vnode->cb_break++; | |
89 | write_sequnlock(&vnode->cb_lock); | |
90 | ||
91 | afs_put_cb_interest(afs_v2net(vnode), cbi); | |
92 | cbi = NULL; | |
d2ddc776 DH |
93 | } |
94 | ||
95 | found_interest: | |
d2ddc776 DH |
96 | return true; |
97 | } | |
98 | ||
99 | /* | |
100 | * Post volume busy note. | |
101 | */ | |
102 | static void afs_busy(struct afs_volume *volume, u32 abort_code) | |
103 | { | |
104 | const char *m; | |
105 | ||
106 | switch (abort_code) { | |
107 | case VOFFLINE: m = "offline"; break; | |
108 | case VRESTARTING: m = "restarting"; break; | |
109 | case VSALVAGING: m = "being salvaged"; break; | |
110 | default: m = "busy"; break; | |
111 | } | |
0fafdc9f | 112 | |
3b6492df | 113 | pr_notice("kAFS: Volume %llu '%s' is %s\n", volume->vid, volume->name, m); |
d2ddc776 DH |
114 | } |
115 | ||
116 | /* | |
117 | * Sleep and retry the operation to the same fileserver. | |
118 | */ | |
119 | static bool afs_sleep_and_retry(struct afs_fs_cursor *fc) | |
120 | { | |
121 | msleep_interruptible(1000); | |
122 | if (signal_pending(current)) { | |
e7f680f4 | 123 | fc->error = -ERESTARTSYS; |
d2ddc776 DH |
124 | return false; |
125 | } | |
126 | ||
127 | return true; | |
128 | } | |
129 | ||
130 | /* | |
131 | * Select the fileserver to use. May be called multiple times to rotate | |
132 | * through the fileservers. | |
133 | */ | |
134 | bool afs_select_fileserver(struct afs_fs_cursor *fc) | |
135 | { | |
136 | struct afs_addr_list *alist; | |
137 | struct afs_server *server; | |
138 | struct afs_vnode *vnode = fc->vnode; | |
3bf0fb6f DH |
139 | u32 rtt, abort_code; |
140 | int error = fc->ac.error, i; | |
d2ddc776 | 141 | |
3bf0fb6f DH |
142 | _enter("%lx[%d],%lx[%d],%d,%d", |
143 | fc->untried, fc->index, | |
144 | fc->ac.tried, fc->ac.index, | |
e7f680f4 | 145 | error, fc->ac.abort_code); |
d2ddc776 DH |
146 | |
147 | if (fc->flags & AFS_FS_CURSOR_STOP) { | |
148 | _leave(" = f [stopped]"); | |
149 | return false; | |
150 | } | |
151 | ||
744bcd71 DH |
152 | fc->nr_iterations++; |
153 | ||
d2ddc776 | 154 | /* Evaluate the result of the previous operation, if there was one. */ |
e7f680f4 | 155 | switch (error) { |
d2ddc776 DH |
156 | case SHRT_MAX: |
157 | goto start; | |
158 | ||
159 | case 0: | |
160 | default: | |
161 | /* Success or local failure. Stop. */ | |
e7f680f4 | 162 | fc->error = error; |
d2ddc776 | 163 | fc->flags |= AFS_FS_CURSOR_STOP; |
e7f680f4 | 164 | _leave(" = f [okay/local %d]", error); |
d2ddc776 DH |
165 | return false; |
166 | ||
167 | case -ECONNABORTED: | |
168 | /* The far side rejected the operation on some grounds. This | |
169 | * might involve the server being busy or the volume having been moved. | |
170 | */ | |
171 | switch (fc->ac.abort_code) { | |
172 | case VNOVOL: | |
173 | /* This fileserver doesn't know about the volume. | |
174 | * - May indicate that the VL is wrong - retry once and compare | |
175 | * the results. | |
176 | * - May indicate that the fileserver couldn't attach to the vol. | |
177 | */ | |
178 | if (fc->flags & AFS_FS_CURSOR_VNOVOL) { | |
e7f680f4 | 179 | fc->error = -EREMOTEIO; |
3d9fa911 | 180 | goto next_server; |
d2ddc776 DH |
181 | } |
182 | ||
183 | write_lock(&vnode->volume->servers_lock); | |
184 | fc->server_list->vnovol_mask |= 1 << fc->index; | |
185 | write_unlock(&vnode->volume->servers_lock); | |
186 | ||
187 | set_bit(AFS_VOLUME_NEEDS_UPDATE, &vnode->volume->flags); | |
e7f680f4 DH |
188 | error = afs_check_volume_status(vnode->volume, fc->key); |
189 | if (error < 0) | |
190 | goto failed_set_error; | |
d2ddc776 DH |
191 | |
192 | if (test_bit(AFS_VOLUME_DELETED, &vnode->volume->flags)) { | |
e7f680f4 | 193 | fc->error = -ENOMEDIUM; |
d2ddc776 DH |
194 | goto failed; |
195 | } | |
196 | ||
197 | /* If the server list didn't change, then assume that | |
198 | * it's the fileserver having trouble. | |
199 | */ | |
200 | if (vnode->volume->servers == fc->server_list) { | |
e7f680f4 | 201 | fc->error = -EREMOTEIO; |
3d9fa911 | 202 | goto next_server; |
d2ddc776 DH |
203 | } |
204 | ||
205 | /* Try again */ | |
206 | fc->flags |= AFS_FS_CURSOR_VNOVOL; | |
207 | _leave(" = t [vnovol]"); | |
208 | return true; | |
209 | ||
210 | case VSALVAGE: /* TODO: Should this return an error or iterate? */ | |
211 | case VVOLEXISTS: | |
212 | case VNOSERVICE: | |
213 | case VONLINE: | |
214 | case VDISKFULL: | |
215 | case VOVERQUOTA: | |
e7f680f4 | 216 | fc->error = afs_abort_to_error(fc->ac.abort_code); |
d2ddc776 DH |
217 | goto next_server; |
218 | ||
219 | case VOFFLINE: | |
220 | if (!test_and_set_bit(AFS_VOLUME_OFFLINE, &vnode->volume->flags)) { | |
221 | afs_busy(vnode->volume, fc->ac.abort_code); | |
222 | clear_bit(AFS_VOLUME_BUSY, &vnode->volume->flags); | |
223 | } | |
224 | if (fc->flags & AFS_FS_CURSOR_NO_VSLEEP) { | |
e7f680f4 | 225 | fc->error = -EADV; |
d2ddc776 DH |
226 | goto failed; |
227 | } | |
228 | if (fc->flags & AFS_FS_CURSOR_CUR_ONLY) { | |
e7f680f4 | 229 | fc->error = -ESTALE; |
d2ddc776 DH |
230 | goto failed; |
231 | } | |
232 | goto busy; | |
233 | ||
234 | case VSALVAGING: | |
235 | case VRESTARTING: | |
236 | case VBUSY: | |
237 | /* Retry after going round all the servers unless we | |
238 | * have a file lock we need to maintain. | |
239 | */ | |
240 | if (fc->flags & AFS_FS_CURSOR_NO_VSLEEP) { | |
e7f680f4 | 241 | fc->error = -EBUSY; |
d2ddc776 DH |
242 | goto failed; |
243 | } | |
244 | if (!test_and_set_bit(AFS_VOLUME_BUSY, &vnode->volume->flags)) { | |
245 | afs_busy(vnode->volume, fc->ac.abort_code); | |
246 | clear_bit(AFS_VOLUME_OFFLINE, &vnode->volume->flags); | |
247 | } | |
248 | busy: | |
249 | if (fc->flags & AFS_FS_CURSOR_CUR_ONLY) { | |
250 | if (!afs_sleep_and_retry(fc)) | |
251 | goto failed; | |
252 | ||
253 | /* Retry with same server & address */ | |
254 | _leave(" = t [vbusy]"); | |
255 | return true; | |
256 | } | |
257 | ||
258 | fc->flags |= AFS_FS_CURSOR_VBUSY; | |
259 | goto next_server; | |
260 | ||
261 | case VMOVED: | |
262 | /* The volume migrated to another server. We consider | |
263 | * consider all locks and callbacks broken and request | |
264 | * an update from the VLDB. | |
265 | * | |
266 | * We also limit the number of VMOVED hops we will | |
267 | * honour, just in case someone sets up a loop. | |
268 | */ | |
269 | if (fc->flags & AFS_FS_CURSOR_VMOVED) { | |
e7f680f4 | 270 | fc->error = -EREMOTEIO; |
d2ddc776 DH |
271 | goto failed; |
272 | } | |
273 | fc->flags |= AFS_FS_CURSOR_VMOVED; | |
274 | ||
275 | set_bit(AFS_VOLUME_WAIT, &vnode->volume->flags); | |
276 | set_bit(AFS_VOLUME_NEEDS_UPDATE, &vnode->volume->flags); | |
e7f680f4 DH |
277 | error = afs_check_volume_status(vnode->volume, fc->key); |
278 | if (error < 0) | |
279 | goto failed_set_error; | |
d2ddc776 DH |
280 | |
281 | /* If the server list didn't change, then the VLDB is | |
282 | * out of sync with the fileservers. This is hopefully | |
283 | * a temporary condition, however, so we don't want to | |
284 | * permanently block access to the file. | |
285 | * | |
286 | * TODO: Try other fileservers if we can. | |
287 | * | |
288 | * TODO: Retry a few times with sleeps. | |
289 | */ | |
290 | if (vnode->volume->servers == fc->server_list) { | |
e7f680f4 | 291 | fc->error = -ENOMEDIUM; |
d2ddc776 DH |
292 | goto failed; |
293 | } | |
294 | ||
295 | goto restart_from_beginning; | |
296 | ||
297 | default: | |
298 | clear_bit(AFS_VOLUME_OFFLINE, &vnode->volume->flags); | |
299 | clear_bit(AFS_VOLUME_BUSY, &vnode->volume->flags); | |
e7f680f4 | 300 | fc->error = afs_abort_to_error(fc->ac.abort_code); |
d2ddc776 DH |
301 | goto failed; |
302 | } | |
303 | ||
e7f680f4 DH |
304 | case -ETIMEDOUT: |
305 | case -ETIME: | |
306 | if (fc->error != -EDESTADDRREQ) | |
307 | goto iterate_address; | |
308 | /* Fall through */ | |
d2ddc776 DH |
309 | case -ENETUNREACH: |
310 | case -EHOSTUNREACH: | |
311 | case -ECONNREFUSED: | |
d2ddc776 | 312 | _debug("no conn"); |
e7f680f4 | 313 | fc->error = error; |
d2ddc776 | 314 | goto iterate_address; |
1a025028 DH |
315 | |
316 | case -ECONNRESET: | |
317 | _debug("call reset"); | |
e7f680f4 | 318 | fc->error = error; |
1a025028 | 319 | goto failed; |
d2ddc776 DH |
320 | } |
321 | ||
322 | restart_from_beginning: | |
323 | _debug("restart"); | |
324 | afs_end_cursor(&fc->ac); | |
325 | afs_put_cb_interest(afs_v2net(vnode), fc->cbi); | |
326 | fc->cbi = NULL; | |
327 | afs_put_serverlist(afs_v2net(vnode), fc->server_list); | |
328 | fc->server_list = NULL; | |
329 | start: | |
330 | _debug("start"); | |
331 | /* See if we need to do an update of the volume record. Note that the | |
332 | * volume may have moved or even have been deleted. | |
333 | */ | |
e7f680f4 DH |
334 | error = afs_check_volume_status(vnode->volume, fc->key); |
335 | if (error < 0) | |
336 | goto failed_set_error; | |
d2ddc776 DH |
337 | |
338 | if (!afs_start_fs_iteration(fc, vnode)) | |
339 | goto failed; | |
d2ddc776 | 340 | |
3bf0fb6f DH |
341 | _debug("__ VOL %llx __", vnode->volume->vid); |
342 | error = afs_probe_fileservers(afs_v2net(vnode), fc->key, fc->server_list); | |
343 | if (error < 0) | |
344 | goto failed_set_error; | |
345 | ||
346 | pick_server: | |
347 | _debug("pick [%lx]", fc->untried); | |
348 | ||
349 | error = afs_wait_for_fs_probes(fc->server_list, fc->untried); | |
350 | if (error < 0) | |
351 | goto failed_set_error; | |
352 | ||
353 | /* Pick the untried server with the lowest RTT. If we have outstanding | |
354 | * callbacks, we stick with the server we're already using if we can. | |
355 | */ | |
356 | if (fc->cbi) { | |
357 | _debug("cbi %u", fc->index); | |
358 | if (test_bit(fc->index, &fc->untried)) | |
359 | goto selected_server; | |
360 | afs_put_cb_interest(afs_v2net(vnode), fc->cbi); | |
361 | fc->cbi = NULL; | |
362 | _debug("nocbi"); | |
363 | } | |
364 | ||
365 | fc->index = -1; | |
366 | rtt = U32_MAX; | |
367 | for (i = 0; i < fc->server_list->nr_servers; i++) { | |
368 | struct afs_server *s = fc->server_list->servers[i].server; | |
369 | ||
370 | if (!test_bit(i, &fc->untried) || !s->probe.responded) | |
371 | continue; | |
372 | if (s->probe.rtt < rtt) { | |
373 | fc->index = i; | |
374 | rtt = s->probe.rtt; | |
375 | } | |
376 | } | |
377 | ||
378 | if (fc->index == -1) | |
379 | goto no_more_servers; | |
380 | ||
381 | selected_server: | |
382 | _debug("use %d", fc->index); | |
383 | __clear_bit(fc->index, &fc->untried); | |
384 | ||
d2ddc776 DH |
385 | /* We're starting on a different fileserver from the list. We need to |
386 | * check it, create a callback intercept, find its address list and | |
387 | * probe its capabilities before we use it. | |
388 | */ | |
389 | ASSERTCMP(fc->ac.alist, ==, NULL); | |
390 | server = fc->server_list->servers[fc->index].server; | |
391 | ||
392 | if (!afs_check_server_record(fc, server)) | |
393 | goto failed; | |
394 | ||
395 | _debug("USING SERVER: %pU", &server->uuid); | |
396 | ||
397 | /* Make sure we've got a callback interest record for this server. We | |
398 | * have to link it in before we send the request as we can be sent a | |
399 | * break request before we've finished decoding the reply and | |
400 | * installing the vnode. | |
401 | */ | |
e7f680f4 DH |
402 | error = afs_register_server_cb_interest(vnode, fc->server_list, |
403 | fc->index); | |
404 | if (error < 0) | |
405 | goto failed_set_error; | |
d2ddc776 DH |
406 | |
407 | fc->cbi = afs_get_cb_interest(vnode->cb_interest); | |
408 | ||
409 | read_lock(&server->fs_lock); | |
410 | alist = rcu_dereference_protected(server->addresses, | |
411 | lockdep_is_held(&server->fs_lock)); | |
412 | afs_get_addrlist(alist); | |
413 | read_unlock(&server->fs_lock); | |
414 | ||
8305e579 | 415 | memset(&fc->ac, 0, sizeof(fc->ac)); |
d2ddc776 | 416 | |
d2ddc776 DH |
417 | if (!fc->ac.alist) |
418 | fc->ac.alist = alist; | |
419 | else | |
420 | afs_put_addrlist(alist); | |
421 | ||
3bf0fb6f | 422 | fc->ac.index = -1; |
d2ddc776 DH |
423 | |
424 | iterate_address: | |
425 | ASSERT(fc->ac.alist); | |
d2ddc776 DH |
426 | /* Iterate over the current server's address list to try and find an |
427 | * address on which it will respond to us. | |
428 | */ | |
fe4d774c DH |
429 | if (!afs_iterate_addresses(&fc->ac)) |
430 | goto next_server; | |
d2ddc776 | 431 | |
3bf0fb6f DH |
432 | _debug("address [%u] %u/%u", fc->index, fc->ac.index, fc->ac.alist->nr_addrs); |
433 | ||
fe4d774c DH |
434 | _leave(" = t"); |
435 | return true; | |
d2ddc776 | 436 | |
16280a15 DH |
437 | next_server: |
438 | _debug("next"); | |
439 | afs_end_cursor(&fc->ac); | |
3bf0fb6f | 440 | goto pick_server; |
16280a15 | 441 | |
3bf0fb6f | 442 | no_more_servers: |
16280a15 DH |
443 | /* That's all the servers poked to no good effect. Try again if some |
444 | * of them were busy. | |
445 | */ | |
446 | if (fc->flags & AFS_FS_CURSOR_VBUSY) | |
447 | goto restart_from_beginning; | |
448 | ||
3bf0fb6f DH |
449 | abort_code = 0; |
450 | error = -EDESTADDRREQ; | |
451 | for (i = 0; i < fc->server_list->nr_servers; i++) { | |
452 | struct afs_server *s = fc->server_list->servers[i].server; | |
453 | int probe_error = READ_ONCE(s->probe.error); | |
454 | ||
455 | switch (probe_error) { | |
456 | case 0: | |
457 | continue; | |
458 | default: | |
459 | if (error == -ETIMEDOUT || | |
460 | error == -ETIME) | |
461 | continue; | |
462 | case -ETIMEDOUT: | |
463 | case -ETIME: | |
464 | if (error == -ENOMEM || | |
465 | error == -ENONET) | |
466 | continue; | |
467 | case -ENOMEM: | |
468 | case -ENONET: | |
469 | if (error == -ENETUNREACH) | |
470 | continue; | |
471 | case -ENETUNREACH: | |
472 | if (error == -EHOSTUNREACH) | |
473 | continue; | |
474 | case -EHOSTUNREACH: | |
475 | if (error == -ECONNREFUSED) | |
476 | continue; | |
477 | case -ECONNREFUSED: | |
478 | if (error == -ECONNRESET) | |
479 | continue; | |
480 | case -ECONNRESET: /* Responded, but call expired. */ | |
481 | if (error == -ECONNABORTED) | |
482 | continue; | |
483 | case -ECONNABORTED: | |
484 | abort_code = s->probe.abort_code; | |
485 | error = probe_error; | |
486 | continue; | |
487 | } | |
488 | } | |
489 | ||
490 | if (error == -ECONNABORTED) | |
491 | error = afs_abort_to_error(abort_code); | |
16280a15 | 492 | |
e7f680f4 DH |
493 | failed_set_error: |
494 | fc->error = error; | |
d2ddc776 DH |
495 | failed: |
496 | fc->flags |= AFS_FS_CURSOR_STOP; | |
fe4d774c | 497 | afs_end_cursor(&fc->ac); |
e7f680f4 | 498 | _leave(" = f [failed %d]", fc->error); |
d2ddc776 DH |
499 | return false; |
500 | } | |
501 | ||
502 | /* | |
503 | * Select the same fileserver we used for a vnode before and only that | |
504 | * fileserver. We use this when we have a lock on that file, which is backed | |
505 | * only by the fileserver we obtained it from. | |
506 | */ | |
507 | bool afs_select_current_fileserver(struct afs_fs_cursor *fc) | |
508 | { | |
509 | struct afs_vnode *vnode = fc->vnode; | |
510 | struct afs_cb_interest *cbi = vnode->cb_interest; | |
511 | struct afs_addr_list *alist; | |
e7f680f4 | 512 | int error = fc->ac.error; |
d2ddc776 DH |
513 | |
514 | _enter(""); | |
515 | ||
e7f680f4 | 516 | switch (error) { |
0fafdc9f DH |
517 | case SHRT_MAX: |
518 | if (!cbi) { | |
e7f680f4 | 519 | fc->error = -ESTALE; |
0fafdc9f DH |
520 | fc->flags |= AFS_FS_CURSOR_STOP; |
521 | return false; | |
522 | } | |
523 | ||
524 | fc->cbi = afs_get_cb_interest(vnode->cb_interest); | |
525 | ||
526 | read_lock(&cbi->server->fs_lock); | |
527 | alist = rcu_dereference_protected(cbi->server->addresses, | |
528 | lockdep_is_held(&cbi->server->fs_lock)); | |
529 | afs_get_addrlist(alist); | |
530 | read_unlock(&cbi->server->fs_lock); | |
531 | if (!alist) { | |
e7f680f4 | 532 | fc->error = -ESTALE; |
0fafdc9f DH |
533 | fc->flags |= AFS_FS_CURSOR_STOP; |
534 | return false; | |
535 | } | |
536 | ||
8305e579 | 537 | memset(&fc->ac, 0, sizeof(fc->ac)); |
0fafdc9f | 538 | fc->ac.alist = alist; |
3bf0fb6f | 539 | fc->ac.index = -1; |
0fafdc9f DH |
540 | goto iterate_address; |
541 | ||
542 | case 0: | |
543 | default: | |
544 | /* Success or local failure. Stop. */ | |
e7f680f4 | 545 | fc->error = error; |
d2ddc776 | 546 | fc->flags |= AFS_FS_CURSOR_STOP; |
e7f680f4 | 547 | _leave(" = f [okay/local %d]", error); |
d2ddc776 | 548 | return false; |
d2ddc776 | 549 | |
0fafdc9f | 550 | case -ECONNABORTED: |
e7f680f4 | 551 | fc->error = afs_abort_to_error(fc->ac.abort_code); |
d2ddc776 | 552 | fc->flags |= AFS_FS_CURSOR_STOP; |
0fafdc9f | 553 | _leave(" = f [abort]"); |
d2ddc776 | 554 | return false; |
0fafdc9f DH |
555 | |
556 | case -ENETUNREACH: | |
557 | case -EHOSTUNREACH: | |
558 | case -ECONNREFUSED: | |
559 | case -ETIMEDOUT: | |
560 | case -ETIME: | |
561 | _debug("no conn"); | |
e7f680f4 | 562 | fc->error = error; |
0fafdc9f | 563 | goto iterate_address; |
d2ddc776 DH |
564 | } |
565 | ||
0fafdc9f DH |
566 | iterate_address: |
567 | /* Iterate over the current server's address list to try and find an | |
568 | * address on which it will respond to us. | |
569 | */ | |
570 | if (afs_iterate_addresses(&fc->ac)) { | |
571 | _leave(" = t"); | |
572 | return true; | |
573 | } | |
574 | ||
575 | afs_end_cursor(&fc->ac); | |
576 | return false; | |
d2ddc776 DH |
577 | } |
578 | ||
744bcd71 DH |
579 | /* |
580 | * Dump cursor state in the case of the error being EDESTADDRREQ. | |
581 | */ | |
582 | static void afs_dump_edestaddrreq(const struct afs_fs_cursor *fc) | |
583 | { | |
584 | static int count; | |
585 | int i; | |
586 | ||
587 | if (!IS_ENABLED(CONFIG_AFS_DEBUG_CURSOR) || count > 3) | |
588 | return; | |
589 | count++; | |
590 | ||
591 | rcu_read_lock(); | |
592 | ||
593 | pr_notice("EDESTADDR occurred\n"); | |
594 | pr_notice("FC: cbb=%x cbb2=%x fl=%hx err=%hd\n", | |
595 | fc->cb_break, fc->cb_break_2, fc->flags, fc->error); | |
3bf0fb6f DH |
596 | pr_notice("FC: ut=%lx ix=%d ni=%u\n", |
597 | fc->untried, fc->index, fc->nr_iterations); | |
744bcd71 DH |
598 | |
599 | if (fc->server_list) { | |
600 | const struct afs_server_list *sl = fc->server_list; | |
3bf0fb6f DH |
601 | pr_notice("FC: SL nr=%u pr=%u vnov=%hx\n", |
602 | sl->nr_servers, sl->preferred, sl->vnovol_mask); | |
744bcd71 DH |
603 | for (i = 0; i < sl->nr_servers; i++) { |
604 | const struct afs_server *s = sl->servers[i].server; | |
605 | pr_notice("FC: server fl=%lx av=%u %pU\n", | |
606 | s->flags, s->addr_version, &s->uuid); | |
607 | if (s->addresses) { | |
608 | const struct afs_addr_list *a = | |
609 | rcu_dereference(s->addresses); | |
3bf0fb6f | 610 | pr_notice("FC: - av=%u nr=%u/%u/%u pr=%u\n", |
744bcd71 DH |
611 | a->version, |
612 | a->nr_ipv4, a->nr_addrs, a->max_addrs, | |
3bf0fb6f DH |
613 | a->preferred); |
614 | pr_notice("FC: - pr=%lx R=%lx F=%lx\n", | |
615 | a->probed, a->responded, a->failed); | |
744bcd71 DH |
616 | if (a == fc->ac.alist) |
617 | pr_notice("FC: - current\n"); | |
618 | } | |
619 | } | |
620 | } | |
621 | ||
3bf0fb6f DH |
622 | pr_notice("AC: t=%lx ax=%u ac=%d er=%d r=%u ni=%u\n", |
623 | fc->ac.tried, fc->ac.index, fc->ac.abort_code, fc->ac.error, | |
624 | fc->ac.responded, fc->ac.nr_iterations); | |
744bcd71 DH |
625 | rcu_read_unlock(); |
626 | } | |
627 | ||
d2ddc776 DH |
628 | /* |
629 | * Tidy up a filesystem cursor and unlock the vnode. | |
630 | */ | |
631 | int afs_end_vnode_operation(struct afs_fs_cursor *fc) | |
632 | { | |
633 | struct afs_net *net = afs_v2net(fc->vnode); | |
d2ddc776 | 634 | |
744bcd71 DH |
635 | if (fc->error == -EDESTADDRREQ || |
636 | fc->error == -ENETUNREACH || | |
637 | fc->error == -EHOSTUNREACH) | |
638 | afs_dump_edestaddrreq(fc); | |
639 | ||
d2ddc776 DH |
640 | mutex_unlock(&fc->vnode->io_lock); |
641 | ||
642 | afs_end_cursor(&fc->ac); | |
643 | afs_put_cb_interest(net, fc->cbi); | |
644 | afs_put_serverlist(net, fc->server_list); | |
645 | ||
e7f680f4 DH |
646 | if (fc->error == -ECONNABORTED) |
647 | fc->error = afs_abort_to_error(fc->ac.abort_code); | |
d2ddc776 | 648 | |
e7f680f4 | 649 | return fc->error; |
d2ddc776 | 650 | } |