1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Common NFS I/O operations for the pnfs file based
4 * layout drivers.
5 *
6 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
7 *
8 * Tom Haynes <loghyr@primarydata.com>
9 */
10
11 #include <linux/nfs_fs.h>
12 #include <linux/nfs_page.h>
13 #include <linux/sunrpc/addr.h>
14 #include <linux/module.h>
15
16 #include "nfs4session.h"
17 #include "internal.h"
18 #include "pnfs.h"
19
20 #define NFSDBG_FACILITY NFSDBG_PNFS
21
22 void pnfs_generic_rw_release(void *data)
23 {
24 struct nfs_pgio_header *hdr = data;
25
26 nfs_put_client(hdr->ds_clp);
27 hdr->mds_ops->rpc_release(data);
28 }
29 EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
30
31 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
32 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data)
33 {
34 struct nfs_writeverf *verf = data->res.verf;
35
36 data->task.tk_status = 0;
37 memset(&verf->verifier, 0, sizeof(verf->verifier));
38 verf->committed = NFS_UNSTABLE;
39 }
40 EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes);
41
42 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data)
43 {
44 struct nfs_commit_data *wdata = data;
45
46 /* Note this may cause RPC to be resent */
47 wdata->mds_ops->rpc_call_done(task, data);
48 }
49 EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done);
50
51 void pnfs_generic_commit_release(void *calldata)
52 {
53 struct nfs_commit_data *data = calldata;
54
55 data->completion_ops->completion(data);
56 pnfs_put_lseg(data->lseg);
57 nfs_put_client(data->ds_clp);
58 nfs_commitdata_release(data);
59 }
60 EXPORT_SYMBOL_GPL(pnfs_generic_commit_release);
61
62 static struct pnfs_layout_segment *
63 pnfs_free_bucket_lseg(struct pnfs_commit_bucket *bucket)
64 {
65 if (list_empty(&bucket->committing) && list_empty(&bucket->written)) {
66 struct pnfs_layout_segment *freeme = bucket->lseg;
67 bucket->lseg = NULL;
68 return freeme;
69 }
70 return NULL;
71 }
72
73 /* The generic layer is about to remove the req from the commit list.
74 * If this will make the bucket empty, it will need to put the lseg reference.
75 * Note this must be called holding nfsi->commit_mutex
76 */
77 void
78 pnfs_generic_clear_request_commit(struct nfs_page *req,
79 struct nfs_commit_info *cinfo)
80 {
81 struct pnfs_commit_bucket *bucket = NULL;
82
83 if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
84 goto out;
85 cinfo->ds->nwritten--;
86 if (list_is_singular(&req->wb_list))
87 bucket = list_first_entry(&req->wb_list,
88 struct pnfs_commit_bucket, written);
89 out:
90 nfs_request_remove_commit_list(req, cinfo);
91 if (bucket)
92 pnfs_put_lseg(pnfs_free_bucket_lseg(bucket));
93 }
94 EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit);
95
96 struct pnfs_commit_array *
97 pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags)
98 {
99 struct pnfs_commit_array *p;
100 struct pnfs_commit_bucket *b;
101
102 p = kmalloc(struct_size(p, buckets, n), gfp_flags);
103 if (!p)
104 return NULL;
105 p->nbuckets = n;
106 INIT_LIST_HEAD(&p->cinfo_list);
107 INIT_LIST_HEAD(&p->lseg_list);
108 p->lseg = NULL;
109 for (b = &p->buckets[0]; n != 0; b++, n--) {
110 INIT_LIST_HEAD(&b->written);
111 INIT_LIST_HEAD(&b->committing);
112 b->lseg = NULL;
113 b->direct_verf.committed = NFS_INVALID_STABLE_HOW;
114 }
115 return p;
116 }
117 EXPORT_SYMBOL_GPL(pnfs_alloc_commit_array);
118
119 void
120 pnfs_free_commit_array(struct pnfs_commit_array *p)
121 {
122 kfree_rcu(p, rcu);
123 }
124 EXPORT_SYMBOL_GPL(pnfs_free_commit_array);
125
126 static struct pnfs_commit_array *
127 pnfs_find_commit_array_by_lseg(struct pnfs_ds_commit_info *fl_cinfo,
128 struct pnfs_layout_segment *lseg)
129 {
130 struct pnfs_commit_array *array;
131
132 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
133 if (array->lseg == lseg)
134 return array;
135 }
136 return NULL;
137 }
138
139 struct pnfs_commit_array *
140 pnfs_add_commit_array(struct pnfs_ds_commit_info *fl_cinfo,
141 struct pnfs_commit_array *new,
142 struct pnfs_layout_segment *lseg)
143 {
144 struct pnfs_commit_array *array;
145
146 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg);
147 if (array)
148 return array;
149 new->lseg = lseg;
150 refcount_set(&new->refcount, 1);
151 list_add_rcu(&new->cinfo_list, &fl_cinfo->commits);
152 list_add(&new->lseg_list, &lseg->pls_commits);
153 return new;
154 }
155 EXPORT_SYMBOL_GPL(pnfs_add_commit_array);
156
157 static struct pnfs_commit_array *
158 pnfs_lookup_commit_array(struct pnfs_ds_commit_info *fl_cinfo,
159 struct pnfs_layout_segment *lseg)
160 {
161 struct pnfs_commit_array *array;
162
163 rcu_read_lock();
164 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg);
165 if (!array) {
166 rcu_read_unlock();
167 fl_cinfo->ops->setup_ds_info(fl_cinfo, lseg);
168 rcu_read_lock();
169 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg);
170 }
171 rcu_read_unlock();
172 return array;
173 }
174
175 static void
176 pnfs_release_commit_array_locked(struct pnfs_commit_array *array)
177 {
178 list_del_rcu(&array->cinfo_list);
179 list_del(&array->lseg_list);
180 pnfs_free_commit_array(array);
181 }
182
183 static void
184 pnfs_put_commit_array_locked(struct pnfs_commit_array *array)
185 {
186 if (refcount_dec_and_test(&array->refcount))
187 pnfs_release_commit_array_locked(array);
188 }
189
190 static void
191 pnfs_put_commit_array(struct pnfs_commit_array *array, struct inode *inode)
192 {
193 if (refcount_dec_and_lock(&array->refcount, &inode->i_lock)) {
194 pnfs_release_commit_array_locked(array);
195 spin_unlock(&inode->i_lock);
196 }
197 }
198
199 static struct pnfs_commit_array *
200 pnfs_get_commit_array(struct pnfs_commit_array *array)
201 {
202 if (refcount_inc_not_zero(&array->refcount))
203 return array;
204 return NULL;
205 }
206
207 static void
208 pnfs_remove_and_free_commit_array(struct pnfs_commit_array *array)
209 {
210 array->lseg = NULL;
211 list_del_init(&array->lseg_list);
212 pnfs_put_commit_array_locked(array);
213 }
214
215 void
216 pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo,
217 struct pnfs_layout_segment *lseg)
218 {
219 struct pnfs_commit_array *array, *tmp;
220
221 list_for_each_entry_safe(array, tmp, &lseg->pls_commits, lseg_list)
222 pnfs_remove_and_free_commit_array(array);
223 }
224 EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_release_lseg);
225
226 void
227 pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo)
228 {
229 struct pnfs_commit_array *array, *tmp;
230
231 list_for_each_entry_safe(array, tmp, &fl_cinfo->commits, cinfo_list)
232 pnfs_remove_and_free_commit_array(array);
233 }
234 EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_destroy);
235
236 /*
237 * Locks the nfs_page requests for commit and moves them to
238 * @bucket->committing.
239 */
240 static int
241 pnfs_bucket_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
242 struct nfs_commit_info *cinfo,
243 int max)
244 {
245 struct list_head *src = &bucket->written;
246 struct list_head *dst = &bucket->committing;
247 int ret;
248
249 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
250 ret = nfs_scan_commit_list(src, dst, cinfo, max);
251 if (ret) {
252 cinfo->ds->nwritten -= ret;
253 cinfo->ds->ncommitting += ret;
254 }
255 return ret;
256 }
257
258 static int pnfs_bucket_scan_array(struct nfs_commit_info *cinfo,
259 struct pnfs_commit_bucket *buckets,
260 unsigned int nbuckets,
261 int max)
262 {
263 unsigned int i;
264 int rv = 0, cnt;
265
266 for (i = 0; i < nbuckets && max != 0; i++) {
267 cnt = pnfs_bucket_scan_ds_commit_list(&buckets[i], cinfo, max);
268 rv += cnt;
269 max -= cnt;
270 }
271 return rv;
272 }
273
274 /* Move reqs from written to committing lists, returning count
275 * of number moved.
276 */
277 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max)
278 {
279 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
280 struct pnfs_commit_array *array;
281 int rv = 0, cnt;
282
283 rcu_read_lock();
284 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
285 if (!array->lseg || !pnfs_get_commit_array(array))
286 continue;
287 rcu_read_unlock();
288 cnt = pnfs_bucket_scan_array(cinfo, array->buckets,
289 array->nbuckets, max);
290 rcu_read_lock();
291 pnfs_put_commit_array(array, cinfo->inode);
292 rv += cnt;
293 max -= cnt;
294 if (!max)
295 break;
296 }
297 rcu_read_unlock();
298 return rv;
299 }
300 EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
301
302 static unsigned int
303 pnfs_bucket_recover_commit_reqs(struct list_head *dst,
304 struct pnfs_commit_bucket *buckets,
305 unsigned int nbuckets,
306 struct nfs_commit_info *cinfo)
307 {
308 struct pnfs_commit_bucket *b;
309 struct pnfs_layout_segment *freeme;
310 unsigned int nwritten, ret = 0;
311 unsigned int i;
312
313 restart:
314 for (i = 0, b = buckets; i < nbuckets; i++, b++) {
315 nwritten = nfs_scan_commit_list(&b->written, dst, cinfo, 0);
316 if (!nwritten)
317 continue;
318 ret += nwritten;
319 freeme = pnfs_free_bucket_lseg(b);
320 if (freeme) {
321 pnfs_put_lseg(freeme);
322 goto restart;
323 }
324 }
325 return ret;
326 }
327
328 /* Pull everything off the committing lists and dump into @dst. */
329 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
330 struct nfs_commit_info *cinfo)
331 {
332 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
333 struct pnfs_commit_array *array;
334 unsigned int nwritten;
335
336 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
337 rcu_read_lock();
338 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
339 if (!array->lseg || !pnfs_get_commit_array(array))
340 continue;
341 rcu_read_unlock();
342 nwritten = pnfs_bucket_recover_commit_reqs(dst,
343 array->buckets,
344 array->nbuckets,
345 cinfo);
346 rcu_read_lock();
347 pnfs_put_commit_array(array, cinfo->inode);
348 fl_cinfo->nwritten -= nwritten;
349 }
350 rcu_read_unlock();
351 }
352 EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
353
354 static struct pnfs_layout_segment *
355 pnfs_bucket_get_committing(struct list_head *head,
356 struct pnfs_commit_bucket *bucket,
357 struct nfs_commit_info *cinfo)
358 {
359 struct pnfs_layout_segment *lseg;
360 struct list_head *pos;
361
362 list_for_each(pos, &bucket->committing)
363 cinfo->ds->ncommitting--;
364 list_splice_init(&bucket->committing, head);
365 lseg = pnfs_free_bucket_lseg(bucket);
366 if (!lseg)
367 lseg = pnfs_get_lseg(bucket->lseg);
368 return lseg;
369 }
370
371 static struct nfs_commit_data *
372 pnfs_bucket_fetch_commitdata(struct pnfs_commit_bucket *bucket,
373 struct nfs_commit_info *cinfo)
374 {
375 struct nfs_commit_data *data = nfs_commitdata_alloc();
376
377 if (!data)
378 return NULL;
379 data->lseg = pnfs_bucket_get_committing(&data->pages, bucket, cinfo);
380 return data;
381 }
382
383 static void pnfs_generic_retry_commit(struct pnfs_commit_bucket *buckets,
384 unsigned int nbuckets,
385 struct nfs_commit_info *cinfo,
386 unsigned int idx)
387 {
388 struct pnfs_commit_bucket *bucket;
389 struct pnfs_layout_segment *freeme;
390 LIST_HEAD(pages);
391
392 for (bucket = buckets; idx < nbuckets; bucket++, idx++) {
393 if (list_empty(&bucket->committing))
394 continue;
395 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
396 freeme = pnfs_bucket_get_committing(&pages, bucket, cinfo);
397 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
398 nfs_retry_commit(&pages, freeme, cinfo, idx);
399 pnfs_put_lseg(freeme);
400 }
401 }
402
403 static unsigned int
404 pnfs_bucket_alloc_ds_commits(struct list_head *list,
405 struct pnfs_commit_bucket *buckets,
406 unsigned int nbuckets,
407 struct nfs_commit_info *cinfo)
408 {
409 struct pnfs_commit_bucket *bucket;
410 struct nfs_commit_data *data;
411 unsigned int i;
412 unsigned int nreq = 0;
413
414 for (i = 0, bucket = buckets; i < nbuckets; i++, bucket++) {
415 if (list_empty(&bucket->committing))
416 continue;
417 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
418 if (!list_empty(&bucket->committing)) {
419 data = pnfs_bucket_fetch_commitdata(bucket, cinfo);
420 if (!data)
421 goto out_error;
422 data->ds_commit_index = i;
423 list_add_tail(&data->list, list);
424 nreq++;
425 }
426 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
427 }
428 return nreq;
429 out_error:
430 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
431 /* Clean up on error */
432 pnfs_generic_retry_commit(buckets, nbuckets, cinfo, i);
433 return nreq;
434 }
435
436 static unsigned int
437 pnfs_alloc_ds_commits_list(struct list_head *list,
438 struct pnfs_ds_commit_info *fl_cinfo,
439 struct nfs_commit_info *cinfo)
440 {
441 struct pnfs_commit_array *array;
442 unsigned int ret = 0;
443
444 rcu_read_lock();
445 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
446 if (!array->lseg || !pnfs_get_commit_array(array))
447 continue;
448 rcu_read_unlock();
449 ret += pnfs_bucket_alloc_ds_commits(list, array->buckets,
450 array->nbuckets, cinfo);
451 rcu_read_lock();
452 pnfs_put_commit_array(array, cinfo->inode);
453 }
454 rcu_read_unlock();
455 return ret;
456 }
457
458 /* This follows nfs_commit_list pretty closely */
459 int
460 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
461 int how, struct nfs_commit_info *cinfo,
462 int (*initiate_commit)(struct nfs_commit_data *data,
463 int how))
464 {
465 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
466 struct nfs_commit_data *data, *tmp;
467 LIST_HEAD(list);
468 unsigned int nreq = 0;
469
470 if (!list_empty(mds_pages)) {
471 data = nfs_commitdata_alloc();
472 if (!data) {
473 nfs_retry_commit(mds_pages, NULL, cinfo, -1);
474 return -ENOMEM;
475 }
476 data->ds_commit_index = -1;
477 list_splice_init(mds_pages, &data->pages);
478 list_add_tail(&data->list, &list);
479 nreq++;
480 }
481
482 nreq += pnfs_alloc_ds_commits_list(&list, fl_cinfo, cinfo);
483 if (nreq == 0)
484 goto out;
485
486 list_for_each_entry_safe(data, tmp, &list, list) {
487 list_del(&data->list);
488 if (data->ds_commit_index < 0) {
489 nfs_init_commit(data, NULL, NULL, cinfo);
490 nfs_initiate_commit(NFS_CLIENT(inode), data,
491 NFS_PROTO(data->inode),
492 data->mds_ops, how,
493 RPC_TASK_CRED_NOREF);
494 } else {
495 nfs_init_commit(data, NULL, data->lseg, cinfo);
496 initiate_commit(data, how);
497 }
498 }
499 out:
500 return PNFS_ATTEMPTED;
501 }
502 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist);
503
504 /*
505 * Data server cache
506 *
507 * Data servers can be mapped to different device ids.
508 * nfs4_pnfs_ds reference counting
509 * - set to 1 on allocation
510 * - incremented when a device id maps a data server already in the cache.
511 * - decremented when deviceid is removed from the cache.
512 */
513 static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
514 static LIST_HEAD(nfs4_data_server_cache);
515
516 /* Debug routines */
517 static void
518 print_ds(struct nfs4_pnfs_ds *ds)
519 {
520 if (ds == NULL) {
521 printk(KERN_WARNING "%s NULL device\n", __func__);
522 return;
523 }
524 printk(KERN_WARNING " ds %s\n"
525 " ref count %d\n"
526 " client %p\n"
527 " cl_exchange_flags %x\n",
528 ds->ds_remotestr,
529 refcount_read(&ds->ds_count), ds->ds_clp,
530 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
531 }
532
533 static bool
534 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
535 {
536 struct sockaddr_in *a, *b;
537 struct sockaddr_in6 *a6, *b6;
538
539 if (addr1->sa_family != addr2->sa_family)
540 return false;
541
542 switch (addr1->sa_family) {
543 case AF_INET:
544 a = (struct sockaddr_in *)addr1;
545 b = (struct sockaddr_in *)addr2;
546
547 if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
548 a->sin_port == b->sin_port)
549 return true;
550 break;
551
552 case AF_INET6:
553 a6 = (struct sockaddr_in6 *)addr1;
554 b6 = (struct sockaddr_in6 *)addr2;
555
556 /* LINKLOCAL addresses must have matching scope_id */
557 if (ipv6_addr_src_scope(&a6->sin6_addr) ==
558 IPV6_ADDR_SCOPE_LINKLOCAL &&
559 a6->sin6_scope_id != b6->sin6_scope_id)
560 return false;
561
562 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
563 a6->sin6_port == b6->sin6_port)
564 return true;
565 break;
566
567 default:
568 dprintk("%s: unhandled address family: %u\n",
569 __func__, addr1->sa_family);
570 return false;
571 }
572
573 return false;
574 }
575
576 /*
577 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does,
578 * declare a match.
579 */
580 static bool
581 _same_data_server_addrs_locked(const struct list_head *dsaddrs1,
582 const struct list_head *dsaddrs2)
583 {
584 struct nfs4_pnfs_ds_addr *da1, *da2;
585 struct sockaddr *sa1, *sa2;
586 bool match = false;
587
588 list_for_each_entry(da1, dsaddrs1, da_node) {
589 sa1 = (struct sockaddr *)&da1->da_addr;
590 match = false;
591 list_for_each_entry(da2, dsaddrs2, da_node) {
592 sa2 = (struct sockaddr *)&da2->da_addr;
593 match = same_sockaddr(sa1, sa2);
594 if (match)
595 break;
596 }
597 if (!match)
598 break;
599 }
600 return match;
601 }
602
603 /*
604 * Lookup DS by addresses. nfs4_ds_cache_lock is held
605 */
606 static struct nfs4_pnfs_ds *
607 _data_server_lookup_locked(const struct list_head *dsaddrs)
608 {
609 struct nfs4_pnfs_ds *ds;
610
611 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
612 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
613 return ds;
614 return NULL;
615 }
616
617 static struct nfs4_pnfs_ds_addr *nfs4_pnfs_ds_addr_alloc(gfp_t gfp_flags)
618 {
619 struct nfs4_pnfs_ds_addr *da = kzalloc(sizeof(*da), gfp_flags);
620 if (da)
621 INIT_LIST_HEAD(&da->da_node);
622 return da;
623 }
624
625 static void nfs4_pnfs_ds_addr_free(struct nfs4_pnfs_ds_addr *da)
626 {
627 kfree(da->da_remotestr);
628 kfree(da->da_netid);
629 kfree(da);
630 }
631
632 static void destroy_ds(struct nfs4_pnfs_ds *ds)
633 {
634 struct nfs4_pnfs_ds_addr *da;
635
636 dprintk("--> %s\n", __func__);
637 ifdebug(FACILITY)
638 print_ds(ds);
639
640 nfs_put_client(ds->ds_clp);
641
642 while (!list_empty(&ds->ds_addrs)) {
643 da = list_first_entry(&ds->ds_addrs,
644 struct nfs4_pnfs_ds_addr,
645 da_node);
646 list_del_init(&da->da_node);
647 nfs4_pnfs_ds_addr_free(da);
648 }
649
650 kfree(ds->ds_remotestr);
651 kfree(ds);
652 }
653
654 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds)
655 {
656 if (refcount_dec_and_lock(&ds->ds_count,
657 &nfs4_ds_cache_lock)) {
658 list_del_init(&ds->ds_node);
659 spin_unlock(&nfs4_ds_cache_lock);
660 destroy_ds(ds);
661 }
662 }
663 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put);
664
665 /*
666 * Create a string with a human readable address and port to avoid
667 * complicated setup around many dprinks.
668 */
669 static char *
670 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
671 {
672 struct nfs4_pnfs_ds_addr *da;
673 char *remotestr;
674 size_t len;
675 char *p;
676
677 len = 3; /* '{', '}' and eol */
678 list_for_each_entry(da, dsaddrs, da_node) {
679 len += strlen(da->da_remotestr) + 1; /* string plus comma */
680 }
681
682 remotestr = kzalloc(len, gfp_flags);
683 if (!remotestr)
684 return NULL;
685
686 p = remotestr;
687 *(p++) = '{';
688 len--;
689 list_for_each_entry(da, dsaddrs, da_node) {
690 size_t ll = strlen(da->da_remotestr);
691
692 if (ll > len)
693 goto out_err;
694
695 memcpy(p, da->da_remotestr, ll);
696 p += ll;
697 len -= ll;
698
699 if (len < 1)
700 goto out_err;
701 (*p++) = ',';
702 len--;
703 }
704 if (len < 2)
705 goto out_err;
706 *(p++) = '}';
707 *p = '\0';
708 return remotestr;
709 out_err:
710 kfree(remotestr);
711 return NULL;
712 }
713
714 /*
715 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if
716 * uncached and return cached struct nfs4_pnfs_ds.
717 */
718 struct nfs4_pnfs_ds *
719 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
720 {
721 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
722 char *remotestr;
723
724 if (list_empty(dsaddrs)) {
725 dprintk("%s: no addresses defined\n", __func__);
726 goto out;
727 }
728
729 ds = kzalloc(sizeof(*ds), gfp_flags);
730 if (!ds)
731 goto out;
732
733 /* this is only used for debugging, so it's ok if its NULL */
734 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
735
736 spin_lock(&nfs4_ds_cache_lock);
737 tmp_ds = _data_server_lookup_locked(dsaddrs);
738 if (tmp_ds == NULL) {
739 INIT_LIST_HEAD(&ds->ds_addrs);
740 list_splice_init(dsaddrs, &ds->ds_addrs);
741 ds->ds_remotestr = remotestr;
742 refcount_set(&ds->ds_count, 1);
743 INIT_LIST_HEAD(&ds->ds_node);
744 ds->ds_clp = NULL;
745 list_add(&ds->ds_node, &nfs4_data_server_cache);
746 dprintk("%s add new data server %s\n", __func__,
747 ds->ds_remotestr);
748 } else {
749 kfree(remotestr);
750 kfree(ds);
751 refcount_inc(&tmp_ds->ds_count);
752 dprintk("%s data server %s found, inc'ed ds_count to %d\n",
753 __func__, tmp_ds->ds_remotestr,
754 refcount_read(&tmp_ds->ds_count));
755 ds = tmp_ds;
756 }
757 spin_unlock(&nfs4_ds_cache_lock);
758 out:
759 return ds;
760 }
761 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
762
763 static int nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
764 {
765 might_sleep();
766 return wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, TASK_KILLABLE);
767 }
768
769 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
770 {
771 smp_mb__before_atomic();
772 clear_and_wake_up_bit(NFS4DS_CONNECTING, &ds->ds_state);
773 }
774
775 static struct nfs_client *(*get_v3_ds_connect)(
776 struct nfs_server *mds_srv,
777 const struct sockaddr_storage *ds_addr,
778 int ds_addrlen,
779 int ds_proto,
780 unsigned int ds_timeo,
781 unsigned int ds_retrans);
782
783 static bool load_v3_ds_connect(void)
784 {
785 if (!get_v3_ds_connect) {
786 get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
787 WARN_ON_ONCE(!get_v3_ds_connect);
788 }
789
790 return(get_v3_ds_connect != NULL);
791 }
792
793 void nfs4_pnfs_v3_ds_connect_unload(void)
794 {
795 if (get_v3_ds_connect) {
796 symbol_put(nfs3_set_ds_client);
797 get_v3_ds_connect = NULL;
798 }
799 }
800
801 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
802 struct nfs4_pnfs_ds *ds,
803 unsigned int timeo,
804 unsigned int retrans)
805 {
806 struct nfs_client *clp = ERR_PTR(-EIO);
807 struct nfs4_pnfs_ds_addr *da;
808 unsigned long connect_timeout = timeo * (retrans + 1) * HZ / 10;
809 int status = 0;
810
811 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
812
813 if (!load_v3_ds_connect())
814 return -EPROTONOSUPPORT;
815
816 list_for_each_entry(da, &ds->ds_addrs, da_node) {
817 dprintk("%s: DS %s: trying address %s\n",
818 __func__, ds->ds_remotestr, da->da_remotestr);
819
820 if (!IS_ERR(clp)) {
821 struct xprt_create xprt_args = {
822 .ident = da->da_transport,
823 .net = clp->cl_net,
824 .dstaddr = (struct sockaddr *)&da->da_addr,
825 .addrlen = da->da_addrlen,
826 .servername = clp->cl_hostname,
827 .connect_timeout = connect_timeout,
828 .reconnect_timeout = connect_timeout,
829 };
830
831 if (da->da_transport != clp->cl_proto)
832 continue;
833 if (da->da_addr.ss_family != clp->cl_addr.ss_family)
834 continue;
835 /* Add this address as an alias */
836 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
837 rpc_clnt_test_and_add_xprt, NULL);
838 continue;
839 }
840 clp = get_v3_ds_connect(mds_srv,
841 &da->da_addr,
842 da->da_addrlen, da->da_transport,
843 timeo, retrans);
844 if (IS_ERR(clp))
845 continue;
846 clp->cl_rpcclient->cl_softerr = 0;
847 clp->cl_rpcclient->cl_softrtry = 0;
848 }
849
850 if (IS_ERR(clp)) {
851 status = PTR_ERR(clp);
852 goto out;
853 }
854
855 smp_wmb();
856 WRITE_ONCE(ds->ds_clp, clp);
857 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
858 out:
859 return status;
860 }
861
862 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
863 struct nfs4_pnfs_ds *ds,
864 unsigned int timeo,
865 unsigned int retrans,
866 u32 minor_version)
867 {
868 struct nfs_client *clp = ERR_PTR(-EIO);
869 struct nfs4_pnfs_ds_addr *da;
870 int status = 0;
871
872 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
873
874 list_for_each_entry(da, &ds->ds_addrs, da_node) {
875 char servername[48];
876
877 dprintk("%s: DS %s: trying address %s\n",
878 __func__, ds->ds_remotestr, da->da_remotestr);
879
880 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) {
881 struct xprt_create xprt_args = {
882 .ident = da->da_transport,
883 .net = clp->cl_net,
884 .dstaddr = (struct sockaddr *)&da->da_addr,
885 .addrlen = da->da_addrlen,
886 .servername = clp->cl_hostname,
887 .xprtsec = clp->cl_xprtsec,
888 };
889 struct nfs4_add_xprt_data xprtdata = {
890 .clp = clp,
891 };
892 struct rpc_add_xprt_test rpcdata = {
893 .add_xprt_test = clp->cl_mvops->session_trunk,
894 .data = &xprtdata,
895 };
896
897 if (da->da_transport != clp->cl_proto &&
898 clp->cl_proto != XPRT_TRANSPORT_TCP_TLS)
899 continue;
900 if (da->da_transport == XPRT_TRANSPORT_TCP &&
901 mds_srv->nfs_client->cl_proto ==
902 XPRT_TRANSPORT_TCP_TLS) {
903 struct sockaddr *addr =
904 (struct sockaddr *)&da->da_addr;
905 struct sockaddr_in *sin =
906 (struct sockaddr_in *)&da->da_addr;
907 struct sockaddr_in6 *sin6 =
908 (struct sockaddr_in6 *)&da->da_addr;
909
910 /* for NFS with TLS we need to supply a correct
911 * servername of the trunked transport, not the
912 * servername of the main transport stored in
913 * clp->cl_hostname. And set the protocol to
914 * indicate to use TLS
915 */
916 servername[0] = '\0';
917 switch(addr->sa_family) {
918 case AF_INET:
919 snprintf(servername, sizeof(servername),
920 "%pI4", &sin->sin_addr.s_addr);
921 break;
922 case AF_INET6:
923 snprintf(servername, sizeof(servername),
924 "%pI6", &sin6->sin6_addr);
925 break;
926 default:
927 /* do not consider this address */
928 continue;
929 }
930 xprt_args.ident = XPRT_TRANSPORT_TCP_TLS;
931 xprt_args.servername = servername;
932 }
933 if (da->da_addr.ss_family != clp->cl_addr.ss_family)
934 continue;
935
936 /**
937 * Test this address for session trunking and
938 * add as an alias
939 */
940 xprtdata.cred = nfs4_get_clid_cred(clp);
941 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
942 rpc_clnt_setup_test_and_add_xprt,
943 &rpcdata);
944 if (xprtdata.cred)
945 put_cred(xprtdata.cred);
946 } else {
947 if (da->da_transport == XPRT_TRANSPORT_TCP &&
948 mds_srv->nfs_client->cl_proto ==
949 XPRT_TRANSPORT_TCP_TLS)
950 da->da_transport = XPRT_TRANSPORT_TCP_TLS;
951 clp = nfs4_set_ds_client(mds_srv,
952 &da->da_addr,
953 da->da_addrlen,
954 da->da_transport, timeo,
955 retrans, minor_version);
956 if (IS_ERR(clp))
957 continue;
958
959 status = nfs4_init_ds_session(clp,
960 mds_srv->nfs_client->cl_lease_time);
961 if (status) {
962 nfs_put_client(clp);
963 clp = ERR_PTR(-EIO);
964 continue;
965 }
966
967 }
968 }
969
970 if (IS_ERR(clp)) {
971 status = PTR_ERR(clp);
972 goto out;
973 }
974
975 smp_wmb();
976 WRITE_ONCE(ds->ds_clp, clp);
977 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
978 out:
979 return status;
980 }
981
982 /*
983 * Create an rpc connection to the nfs4_pnfs_ds data server.
984 * Currently only supports IPv4 and IPv6 addresses.
985 * If connection fails, make devid unavailable and return a -errno.
986 */
987 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
988 struct nfs4_deviceid_node *devid, unsigned int timeo,
989 unsigned int retrans, u32 version, u32 minor_version)
990 {
991 int err;
992
993 do {
994 err = nfs4_wait_ds_connect(ds);
995 if (err || ds->ds_clp)
996 goto out;
997 if (nfs4_test_deviceid_unavailable(devid))
998 return -ENODEV;
999 } while (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) != 0);
1000
1001 if (ds->ds_clp)
1002 goto connect_done;
1003
1004 switch (version) {
1005 case 3:
1006 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, retrans);
1007 break;
1008 case 4:
1009 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, retrans,
1010 minor_version);
1011 break;
1012 default:
1013 dprintk("%s: unsupported DS version %d\n", __func__, version);
1014 err = -EPROTONOSUPPORT;
1015 }
1016
1017 connect_done:
1018 nfs4_clear_ds_conn_bit(ds);
1019 out:
1020 /*
1021 * At this point the ds->ds_clp should be ready, but it might have
1022 * hit an error.
1023 */
1024 if (!err) {
1025 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) {
1026 WARN_ON_ONCE(ds->ds_clp ||
1027 !nfs4_test_deviceid_unavailable(devid));
1028 return -EINVAL;
1029 }
1030 err = nfs_client_init_status(ds->ds_clp);
1031 }
1032
1033 return err;
1034 }
1035 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
1036
1037 /*
1038 * Currently only supports ipv4, ipv6 and one multi-path address.
1039 */
1040 struct nfs4_pnfs_ds_addr *
1041 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags)
1042 {
1043 struct nfs4_pnfs_ds_addr *da = NULL;
1044 char *buf, *portstr;
1045 __be16 port;
1046 ssize_t nlen, rlen;
1047 int tmp[2];
1048 char *netid;
1049 size_t len;
1050 char *startsep = "";
1051 char *endsep = "";
1052
1053
1054 /* r_netid */
1055 nlen = xdr_stream_decode_string_dup(xdr, &netid, XDR_MAX_NETOBJ,
1056 gfp_flags);
1057 if (unlikely(nlen < 0))
1058 goto out_err;
1059
1060 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
1061 /* port is ".ABC.DEF", 8 chars max */
1062 rlen = xdr_stream_decode_string_dup(xdr, &buf, INET6_ADDRSTRLEN +
1063 IPV6_SCOPE_ID_LEN + 8, gfp_flags);
1064 if (unlikely(rlen < 0))
1065 goto out_free_netid;
1066
1067 /* replace port '.' with '-' */
1068 portstr = strrchr(buf, '.');
1069 if (!portstr) {
1070 dprintk("%s: Failed finding expected dot in port\n",
1071 __func__);
1072 goto out_free_buf;
1073 }
1074 *portstr = '-';
1075
1076 /* find '.' between address and port */
1077 portstr = strrchr(buf, '.');
1078 if (!portstr) {
1079 dprintk("%s: Failed finding expected dot between address and "
1080 "port\n", __func__);
1081 goto out_free_buf;
1082 }
1083 *portstr = '\0';
1084
1085 da = nfs4_pnfs_ds_addr_alloc(gfp_flags);
1086 if (unlikely(!da))
1087 goto out_free_buf;
1088
1089 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
1090 sizeof(da->da_addr))) {
1091 dprintk("%s: error parsing address %s\n", __func__, buf);
1092 goto out_free_da;
1093 }
1094
1095 portstr++;
1096 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
1097 port = htons((tmp[0] << 8) | (tmp[1]));
1098
1099 switch (da->da_addr.ss_family) {
1100 case AF_INET:
1101 ((struct sockaddr_in *)&da->da_addr)->sin_port = port;
1102 da->da_addrlen = sizeof(struct sockaddr_in);
1103 break;
1104
1105 case AF_INET6:
1106 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
1107 da->da_addrlen = sizeof(struct sockaddr_in6);
1108 startsep = "[";
1109 endsep = "]";
1110 break;
1111
1112 default:
1113 dprintk("%s: unsupported address family: %u\n",
1114 __func__, da->da_addr.ss_family);
1115 goto out_free_da;
1116 }
1117
1118 da->da_transport = xprt_find_transport_ident(netid);
1119 if (da->da_transport < 0) {
1120 dprintk("%s: ERROR: unknown r_netid \"%s\"\n",
1121 __func__, netid);
1122 goto out_free_da;
1123 }
1124
1125 da->da_netid = netid;
1126
1127 /* save human readable address */
1128 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
1129 da->da_remotestr = kzalloc(len, gfp_flags);
1130
1131 /* NULL is ok, only used for dprintk */
1132 if (da->da_remotestr)
1133 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
1134 buf, endsep, ntohs(port));
1135
1136 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
1137 kfree(buf);
1138 return da;
1139
1140 out_free_da:
1141 kfree(da);
1142 out_free_buf:
1143 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
1144 kfree(buf);
1145 out_free_netid:
1146 kfree(netid);
1147 out_err:
1148 return NULL;
1149 }
1150 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
1151
1152 void
1153 pnfs_layout_mark_request_commit(struct nfs_page *req,
1154 struct pnfs_layout_segment *lseg,
1155 struct nfs_commit_info *cinfo,
1156 u32 ds_commit_idx)
1157 {
1158 struct list_head *list;
1159 struct pnfs_commit_array *array;
1160 struct pnfs_commit_bucket *bucket;
1161
1162 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
1163 array = pnfs_lookup_commit_array(cinfo->ds, lseg);
1164 if (!array || !pnfs_is_valid_lseg(lseg))
1165 goto out_resched;
1166 bucket = &array->buckets[ds_commit_idx];
1167 list = &bucket->written;
1168 /* Non-empty buckets hold a reference on the lseg. That ref
1169 * is normally transferred to the COMMIT call and released
1170 * there. It could also be released if the last req is pulled
1171 * off due to a rewrite, in which case it will be done in
1172 * pnfs_common_clear_request_commit
1173 */
1174 if (!bucket->lseg)
1175 bucket->lseg = pnfs_get_lseg(lseg);
1176 set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1177 cinfo->ds->nwritten++;
1178
1179 nfs_request_add_commit_list_locked(req, list, cinfo);
1180 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1181 nfs_folio_mark_unstable(nfs_page_to_folio(req), cinfo);
1182 return;
1183 out_resched:
1184 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1185 cinfo->completion_ops->resched_write(cinfo, req);
1186 }
1187 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
1188
1189 int
1190 pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
1191 {
1192 int ret;
1193
1194 if (!pnfs_layoutcommit_outstanding(inode))
1195 return 0;
1196 ret = nfs_commit_inode(inode, FLUSH_SYNC);
1197 if (ret < 0)
1198 return ret;
1199 if (datasync)
1200 return 0;
1201 return pnfs_layoutcommit_inode(inode, true);
1202 }
1203 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
1204
1205
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