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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
22void 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}
29EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
30
31/* Fake up some data that will cause nfs_commit_release to retry the writes. */
32void 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}
40EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes);
41
42void 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}
49EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done);
50
51void 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}
60EXPORT_SYMBOL_GPL(pnfs_generic_commit_release);
61
62static struct pnfs_layout_segment *
63pnfs_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 */
77void
78pnfs_generic_clear_request_commit(struct nfs_page *req,
79 struct nfs_commit_info *cinfo)
80{
81 struct pnfs_layout_segment *freeme = 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 struct pnfs_commit_bucket *bucket;
88
89 bucket = list_first_entry(&req->wb_list,
90 struct pnfs_commit_bucket,
91 written);
92 freeme = pnfs_free_bucket_lseg(bucket);
93 }
94out:
95 nfs_request_remove_commit_list(req, cinfo);
96 pnfs_put_lseg(freeme);
97}
98EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit);
99
100struct pnfs_commit_array *
101pnfs_alloc_commit_array(size_t n, gfp_t gfp_flags)
102{
103 struct pnfs_commit_array *p;
104 struct pnfs_commit_bucket *b;
105
106 p = kmalloc(struct_size(p, buckets, n), gfp_flags);
107 if (!p)
108 return NULL;
109 p->nbuckets = n;
110 INIT_LIST_HEAD(&p->cinfo_list);
111 INIT_LIST_HEAD(&p->lseg_list);
112 p->lseg = NULL;
113 for (b = &p->buckets[0]; n != 0; b++, n--) {
114 INIT_LIST_HEAD(&b->written);
115 INIT_LIST_HEAD(&b->committing);
116 b->lseg = NULL;
117 b->direct_verf.committed = NFS_INVALID_STABLE_HOW;
118 }
119 return p;
120}
121EXPORT_SYMBOL_GPL(pnfs_alloc_commit_array);
122
123void
124pnfs_free_commit_array(struct pnfs_commit_array *p)
125{
126 kfree_rcu(p, rcu);
127}
128EXPORT_SYMBOL_GPL(pnfs_free_commit_array);
129
130static struct pnfs_commit_array *
131pnfs_find_commit_array_by_lseg(struct pnfs_ds_commit_info *fl_cinfo,
132 struct pnfs_layout_segment *lseg)
133{
134 struct pnfs_commit_array *array;
135
136 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
137 if (array->lseg == lseg)
138 return array;
139 }
140 return NULL;
141}
142
143struct pnfs_commit_array *
144pnfs_add_commit_array(struct pnfs_ds_commit_info *fl_cinfo,
145 struct pnfs_commit_array *new,
146 struct pnfs_layout_segment *lseg)
147{
148 struct pnfs_commit_array *array;
149
150 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg);
151 if (array)
152 return array;
153 new->lseg = lseg;
154 refcount_set(&new->refcount, 1);
155 list_add_rcu(&new->cinfo_list, &fl_cinfo->commits);
156 list_add(&new->lseg_list, &lseg->pls_commits);
157 return new;
158}
159EXPORT_SYMBOL_GPL(pnfs_add_commit_array);
160
161static struct pnfs_commit_array *
162pnfs_lookup_commit_array(struct pnfs_ds_commit_info *fl_cinfo,
163 struct pnfs_layout_segment *lseg)
164{
165 struct pnfs_commit_array *array;
166
167 rcu_read_lock();
168 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg);
169 if (!array) {
170 rcu_read_unlock();
171 fl_cinfo->ops->setup_ds_info(fl_cinfo, lseg);
172 rcu_read_lock();
173 array = pnfs_find_commit_array_by_lseg(fl_cinfo, lseg);
174 }
175 rcu_read_unlock();
176 return array;
177}
178
179static void
180pnfs_release_commit_array_locked(struct pnfs_commit_array *array)
181{
182 list_del_rcu(&array->cinfo_list);
183 list_del(&array->lseg_list);
184 pnfs_free_commit_array(array);
185}
186
187static void
188pnfs_put_commit_array_locked(struct pnfs_commit_array *array)
189{
190 if (refcount_dec_and_test(&array->refcount))
191 pnfs_release_commit_array_locked(array);
192}
193
194static void
195pnfs_put_commit_array(struct pnfs_commit_array *array, struct inode *inode)
196{
197 if (refcount_dec_and_lock(&array->refcount, &inode->i_lock)) {
198 pnfs_release_commit_array_locked(array);
199 spin_unlock(&inode->i_lock);
200 }
201}
202
203static struct pnfs_commit_array *
204pnfs_get_commit_array(struct pnfs_commit_array *array)
205{
206 if (refcount_inc_not_zero(&array->refcount))
207 return array;
208 return NULL;
209}
210
211static void
212pnfs_remove_and_free_commit_array(struct pnfs_commit_array *array)
213{
214 array->lseg = NULL;
215 list_del_init(&array->lseg_list);
216 pnfs_put_commit_array_locked(array);
217}
218
219void
220pnfs_generic_ds_cinfo_release_lseg(struct pnfs_ds_commit_info *fl_cinfo,
221 struct pnfs_layout_segment *lseg)
222{
223 struct pnfs_commit_array *array, *tmp;
224
225 list_for_each_entry_safe(array, tmp, &lseg->pls_commits, lseg_list)
226 pnfs_remove_and_free_commit_array(array);
227}
228EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_release_lseg);
229
230void
231pnfs_generic_ds_cinfo_destroy(struct pnfs_ds_commit_info *fl_cinfo)
232{
233 struct pnfs_commit_array *array, *tmp;
234
235 list_for_each_entry_safe(array, tmp, &fl_cinfo->commits, cinfo_list)
236 pnfs_remove_and_free_commit_array(array);
237}
238EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_destroy);
239
240/*
241 * Locks the nfs_page requests for commit and moves them to
242 * @bucket->committing.
243 */
244static int
245pnfs_bucket_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
246 struct nfs_commit_info *cinfo,
247 int max)
248{
249 struct list_head *src = &bucket->written;
250 struct list_head *dst = &bucket->committing;
251 int ret;
252
253 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
254 ret = nfs_scan_commit_list(src, dst, cinfo, max);
255 if (ret) {
256 cinfo->ds->nwritten -= ret;
257 cinfo->ds->ncommitting += ret;
258 }
259 return ret;
260}
261
262static int pnfs_bucket_scan_array(struct nfs_commit_info *cinfo,
263 struct pnfs_commit_bucket *buckets,
264 unsigned int nbuckets,
265 int max)
266{
267 unsigned int i;
268 int rv = 0, cnt;
269
270 for (i = 0; i < nbuckets && max != 0; i++) {
271 cnt = pnfs_bucket_scan_ds_commit_list(&buckets[i], cinfo, max);
272 rv += cnt;
273 max -= cnt;
274 }
275 return rv;
276}
277
278/* Move reqs from written to committing lists, returning count
279 * of number moved.
280 */
281int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, int max)
282{
283 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
284 struct pnfs_commit_array *array;
285 int rv = 0, cnt;
286
287 rcu_read_lock();
288 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
289 if (!array->lseg || !pnfs_get_commit_array(array))
290 continue;
291 rcu_read_unlock();
292 cnt = pnfs_bucket_scan_array(cinfo, array->buckets,
293 array->nbuckets, max);
294 rcu_read_lock();
295 pnfs_put_commit_array(array, cinfo->inode);
296 rv += cnt;
297 max -= cnt;
298 if (!max)
299 break;
300 }
301 rcu_read_unlock();
302 return rv;
303}
304EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
305
306static unsigned int
307pnfs_bucket_recover_commit_reqs(struct list_head *dst,
308 struct pnfs_commit_bucket *buckets,
309 unsigned int nbuckets,
310 struct nfs_commit_info *cinfo)
311{
312 struct pnfs_commit_bucket *b;
313 struct pnfs_layout_segment *freeme;
314 unsigned int nwritten, ret = 0;
315 unsigned int i;
316
317restart:
318 for (i = 0, b = buckets; i < nbuckets; i++, b++) {
319 nwritten = nfs_scan_commit_list(&b->written, dst, cinfo, 0);
320 if (!nwritten)
321 continue;
322 ret += nwritten;
323 freeme = pnfs_free_bucket_lseg(b);
324 if (freeme) {
325 pnfs_put_lseg(freeme);
326 goto restart;
327 }
328 }
329 return ret;
330}
331
332/* Pull everything off the committing lists and dump into @dst. */
333void pnfs_generic_recover_commit_reqs(struct list_head *dst,
334 struct nfs_commit_info *cinfo)
335{
336 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
337 struct pnfs_commit_array *array;
338 unsigned int nwritten;
339
340 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
341 rcu_read_lock();
342 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
343 if (!array->lseg || !pnfs_get_commit_array(array))
344 continue;
345 rcu_read_unlock();
346 nwritten = pnfs_bucket_recover_commit_reqs(dst,
347 array->buckets,
348 array->nbuckets,
349 cinfo);
350 rcu_read_lock();
351 pnfs_put_commit_array(array, cinfo->inode);
352 fl_cinfo->nwritten -= nwritten;
353 }
354 rcu_read_unlock();
355}
356EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
357
358static struct nfs_page *
359pnfs_bucket_search_commit_reqs(struct pnfs_commit_bucket *buckets,
360 unsigned int nbuckets, struct page *page)
361{
362 struct nfs_page *req;
363 struct pnfs_commit_bucket *b;
364 unsigned int i;
365
366 /* Linearly search the commit lists for each bucket until a matching
367 * request is found */
368 for (i = 0, b = buckets; i < nbuckets; i++, b++) {
369 list_for_each_entry(req, &b->written, wb_list) {
370 if (req->wb_page == page)
371 return req->wb_head;
372 }
373 list_for_each_entry(req, &b->committing, wb_list) {
374 if (req->wb_page == page)
375 return req->wb_head;
376 }
377 }
378 return NULL;
379}
380
381/* pnfs_generic_search_commit_reqs - Search lists in @cinfo for the head reqest
382 * for @page
383 * @cinfo - commit info for current inode
384 * @page - page to search for matching head request
385 *
386 * Returns a the head request if one is found, otherwise returns NULL.
387 */
388struct nfs_page *
389pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page)
390{
391 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
392 struct pnfs_commit_array *array;
393 struct nfs_page *req;
394
395 list_for_each_entry(array, &fl_cinfo->commits, cinfo_list) {
396 req = pnfs_bucket_search_commit_reqs(array->buckets,
397 array->nbuckets, page);
398 if (req)
399 return req;
400 }
401 return NULL;
402}
403EXPORT_SYMBOL_GPL(pnfs_generic_search_commit_reqs);
404
405static struct pnfs_layout_segment *
406pnfs_bucket_get_committing(struct list_head *head,
407 struct pnfs_commit_bucket *bucket,
408 struct nfs_commit_info *cinfo)
409{
410 struct list_head *pos;
411
412 list_for_each(pos, &bucket->committing)
413 cinfo->ds->ncommitting--;
414 list_splice_init(&bucket->committing, head);
415 return pnfs_free_bucket_lseg(bucket);
416}
417
418static struct nfs_commit_data *
419pnfs_bucket_fetch_commitdata(struct pnfs_commit_bucket *bucket,
420 struct nfs_commit_info *cinfo)
421{
422 struct nfs_commit_data *data = nfs_commitdata_alloc(false);
423
424 if (!data)
425 return NULL;
426 data->lseg = pnfs_bucket_get_committing(&data->pages, bucket, cinfo);
427 if (!data->lseg)
428 data->lseg = pnfs_get_lseg(bucket->lseg);
429 return data;
430}
431
432static void pnfs_generic_retry_commit(struct pnfs_commit_bucket *buckets,
433 unsigned int nbuckets,
434 struct nfs_commit_info *cinfo,
435 unsigned int idx)
436{
437 struct pnfs_commit_bucket *bucket;
438 struct pnfs_layout_segment *freeme;
439 LIST_HEAD(pages);
440
441 for (bucket = buckets; idx < nbuckets; bucket++, idx++) {
442 if (list_empty(&bucket->committing))
443 continue;
444 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
445 freeme = pnfs_bucket_get_committing(&pages, bucket, cinfo);
446 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
447 nfs_retry_commit(&pages, freeme, cinfo, idx);
448 pnfs_put_lseg(freeme);
449 }
450}
451
452static unsigned int
453pnfs_bucket_alloc_ds_commits(struct list_head *list,
454 struct pnfs_commit_bucket *buckets,
455 unsigned int nbuckets,
456 struct nfs_commit_info *cinfo)
457{
458 struct pnfs_commit_bucket *bucket;
459 struct nfs_commit_data *data;
460 unsigned int i;
461 unsigned int nreq = 0;
462
463 for (i = 0, bucket = buckets; i < nbuckets; i++, bucket++) {
464 if (list_empty(&bucket->committing))
465 continue;
466 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
467 if (!list_empty(&bucket->committing)) {
468 data = pnfs_bucket_fetch_commitdata(bucket, cinfo);
469 if (!data)
470 goto out_error;
471 data->ds_commit_index = i;
472 list_add_tail(&data->list, list);
473 atomic_inc(&cinfo->mds->rpcs_out);
474 nreq++;
475 }
476 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
477 }
478 return nreq;
479out_error:
480 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
481 /* Clean up on error */
482 pnfs_generic_retry_commit(buckets, nbuckets, cinfo, i);
483 return nreq;
484}
485
486static unsigned int
487pnfs_alloc_ds_commits_list(struct list_head *list,
488 struct pnfs_ds_commit_info *fl_cinfo,
489 struct nfs_commit_info *cinfo)
490{
491 struct pnfs_commit_array *array;
492 unsigned int ret = 0;
493
494 rcu_read_lock();
495 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
496 if (!array->lseg || !pnfs_get_commit_array(array))
497 continue;
498 rcu_read_unlock();
499 ret += pnfs_bucket_alloc_ds_commits(list, array->buckets,
500 array->nbuckets, cinfo);
501 rcu_read_lock();
502 pnfs_put_commit_array(array, cinfo->inode);
503 }
504 rcu_read_unlock();
505 return ret;
506}
507
508/* This follows nfs_commit_list pretty closely */
509int
510pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
511 int how, struct nfs_commit_info *cinfo,
512 int (*initiate_commit)(struct nfs_commit_data *data,
513 int how))
514{
515 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
516 struct nfs_commit_data *data, *tmp;
517 LIST_HEAD(list);
518 unsigned int nreq = 0;
519
520 if (!list_empty(mds_pages)) {
521 data = nfs_commitdata_alloc(true);
522 data->ds_commit_index = -1;
523 list_splice_init(mds_pages, &data->pages);
524 list_add_tail(&data->list, &list);
525 atomic_inc(&cinfo->mds->rpcs_out);
526 nreq++;
527 }
528
529 nreq += pnfs_alloc_ds_commits_list(&list, fl_cinfo, cinfo);
530 if (nreq == 0)
531 goto out;
532
533 list_for_each_entry_safe(data, tmp, &list, list) {
534 list_del(&data->list);
535 if (data->ds_commit_index < 0) {
536 nfs_init_commit(data, NULL, NULL, cinfo);
537 nfs_initiate_commit(NFS_CLIENT(inode), data,
538 NFS_PROTO(data->inode),
539 data->mds_ops, how,
540 RPC_TASK_CRED_NOREF);
541 } else {
542 nfs_init_commit(data, NULL, data->lseg, cinfo);
543 initiate_commit(data, how);
544 }
545 }
546out:
547 return PNFS_ATTEMPTED;
548}
549EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist);
550
551/*
552 * Data server cache
553 *
554 * Data servers can be mapped to different device ids.
555 * nfs4_pnfs_ds reference counting
556 * - set to 1 on allocation
557 * - incremented when a device id maps a data server already in the cache.
558 * - decremented when deviceid is removed from the cache.
559 */
560static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
561static LIST_HEAD(nfs4_data_server_cache);
562
563/* Debug routines */
564static void
565print_ds(struct nfs4_pnfs_ds *ds)
566{
567 if (ds == NULL) {
568 printk(KERN_WARNING "%s NULL device\n", __func__);
569 return;
570 }
571 printk(KERN_WARNING " ds %s\n"
572 " ref count %d\n"
573 " client %p\n"
574 " cl_exchange_flags %x\n",
575 ds->ds_remotestr,
576 refcount_read(&ds->ds_count), ds->ds_clp,
577 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
578}
579
580static bool
581same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
582{
583 struct sockaddr_in *a, *b;
584 struct sockaddr_in6 *a6, *b6;
585
586 if (addr1->sa_family != addr2->sa_family)
587 return false;
588
589 switch (addr1->sa_family) {
590 case AF_INET:
591 a = (struct sockaddr_in *)addr1;
592 b = (struct sockaddr_in *)addr2;
593
594 if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
595 a->sin_port == b->sin_port)
596 return true;
597 break;
598
599 case AF_INET6:
600 a6 = (struct sockaddr_in6 *)addr1;
601 b6 = (struct sockaddr_in6 *)addr2;
602
603 /* LINKLOCAL addresses must have matching scope_id */
604 if (ipv6_addr_src_scope(&a6->sin6_addr) ==
605 IPV6_ADDR_SCOPE_LINKLOCAL &&
606 a6->sin6_scope_id != b6->sin6_scope_id)
607 return false;
608
609 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
610 a6->sin6_port == b6->sin6_port)
611 return true;
612 break;
613
614 default:
615 dprintk("%s: unhandled address family: %u\n",
616 __func__, addr1->sa_family);
617 return false;
618 }
619
620 return false;
621}
622
623/*
624 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does,
625 * declare a match.
626 */
627static bool
628_same_data_server_addrs_locked(const struct list_head *dsaddrs1,
629 const struct list_head *dsaddrs2)
630{
631 struct nfs4_pnfs_ds_addr *da1, *da2;
632 struct sockaddr *sa1, *sa2;
633 bool match = false;
634
635 list_for_each_entry(da1, dsaddrs1, da_node) {
636 sa1 = (struct sockaddr *)&da1->da_addr;
637 match = false;
638 list_for_each_entry(da2, dsaddrs2, da_node) {
639 sa2 = (struct sockaddr *)&da2->da_addr;
640 match = same_sockaddr(sa1, sa2);
641 if (match)
642 break;
643 }
644 if (!match)
645 break;
646 }
647 return match;
648}
649
650/*
651 * Lookup DS by addresses. nfs4_ds_cache_lock is held
652 */
653static struct nfs4_pnfs_ds *
654_data_server_lookup_locked(const struct list_head *dsaddrs)
655{
656 struct nfs4_pnfs_ds *ds;
657
658 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
659 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
660 return ds;
661 return NULL;
662}
663
664static void destroy_ds(struct nfs4_pnfs_ds *ds)
665{
666 struct nfs4_pnfs_ds_addr *da;
667
668 dprintk("--> %s\n", __func__);
669 ifdebug(FACILITY)
670 print_ds(ds);
671
672 nfs_put_client(ds->ds_clp);
673
674 while (!list_empty(&ds->ds_addrs)) {
675 da = list_first_entry(&ds->ds_addrs,
676 struct nfs4_pnfs_ds_addr,
677 da_node);
678 list_del_init(&da->da_node);
679 kfree(da->da_remotestr);
680 kfree(da);
681 }
682
683 kfree(ds->ds_remotestr);
684 kfree(ds);
685}
686
687void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds)
688{
689 if (refcount_dec_and_lock(&ds->ds_count,
690 &nfs4_ds_cache_lock)) {
691 list_del_init(&ds->ds_node);
692 spin_unlock(&nfs4_ds_cache_lock);
693 destroy_ds(ds);
694 }
695}
696EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put);
697
698/*
699 * Create a string with a human readable address and port to avoid
700 * complicated setup around many dprinks.
701 */
702static char *
703nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
704{
705 struct nfs4_pnfs_ds_addr *da;
706 char *remotestr;
707 size_t len;
708 char *p;
709
710 len = 3; /* '{', '}' and eol */
711 list_for_each_entry(da, dsaddrs, da_node) {
712 len += strlen(da->da_remotestr) + 1; /* string plus comma */
713 }
714
715 remotestr = kzalloc(len, gfp_flags);
716 if (!remotestr)
717 return NULL;
718
719 p = remotestr;
720 *(p++) = '{';
721 len--;
722 list_for_each_entry(da, dsaddrs, da_node) {
723 size_t ll = strlen(da->da_remotestr);
724
725 if (ll > len)
726 goto out_err;
727
728 memcpy(p, da->da_remotestr, ll);
729 p += ll;
730 len -= ll;
731
732 if (len < 1)
733 goto out_err;
734 (*p++) = ',';
735 len--;
736 }
737 if (len < 2)
738 goto out_err;
739 *(p++) = '}';
740 *p = '\0';
741 return remotestr;
742out_err:
743 kfree(remotestr);
744 return NULL;
745}
746
747/*
748 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if
749 * uncached and return cached struct nfs4_pnfs_ds.
750 */
751struct nfs4_pnfs_ds *
752nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
753{
754 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
755 char *remotestr;
756
757 if (list_empty(dsaddrs)) {
758 dprintk("%s: no addresses defined\n", __func__);
759 goto out;
760 }
761
762 ds = kzalloc(sizeof(*ds), gfp_flags);
763 if (!ds)
764 goto out;
765
766 /* this is only used for debugging, so it's ok if its NULL */
767 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
768
769 spin_lock(&nfs4_ds_cache_lock);
770 tmp_ds = _data_server_lookup_locked(dsaddrs);
771 if (tmp_ds == NULL) {
772 INIT_LIST_HEAD(&ds->ds_addrs);
773 list_splice_init(dsaddrs, &ds->ds_addrs);
774 ds->ds_remotestr = remotestr;
775 refcount_set(&ds->ds_count, 1);
776 INIT_LIST_HEAD(&ds->ds_node);
777 ds->ds_clp = NULL;
778 list_add(&ds->ds_node, &nfs4_data_server_cache);
779 dprintk("%s add new data server %s\n", __func__,
780 ds->ds_remotestr);
781 } else {
782 kfree(remotestr);
783 kfree(ds);
784 refcount_inc(&tmp_ds->ds_count);
785 dprintk("%s data server %s found, inc'ed ds_count to %d\n",
786 __func__, tmp_ds->ds_remotestr,
787 refcount_read(&tmp_ds->ds_count));
788 ds = tmp_ds;
789 }
790 spin_unlock(&nfs4_ds_cache_lock);
791out:
792 return ds;
793}
794EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
795
796static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
797{
798 might_sleep();
799 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING,
800 TASK_KILLABLE);
801}
802
803static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
804{
805 smp_mb__before_atomic();
806 clear_bit(NFS4DS_CONNECTING, &ds->ds_state);
807 smp_mb__after_atomic();
808 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING);
809}
810
811static struct nfs_client *(*get_v3_ds_connect)(
812 struct nfs_server *mds_srv,
813 const struct sockaddr *ds_addr,
814 int ds_addrlen,
815 int ds_proto,
816 unsigned int ds_timeo,
817 unsigned int ds_retrans);
818
819static bool load_v3_ds_connect(void)
820{
821 if (!get_v3_ds_connect) {
822 get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
823 WARN_ON_ONCE(!get_v3_ds_connect);
824 }
825
826 return(get_v3_ds_connect != NULL);
827}
828
829void nfs4_pnfs_v3_ds_connect_unload(void)
830{
831 if (get_v3_ds_connect) {
832 symbol_put(nfs3_set_ds_client);
833 get_v3_ds_connect = NULL;
834 }
835}
836
837static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
838 struct nfs4_pnfs_ds *ds,
839 unsigned int timeo,
840 unsigned int retrans)
841{
842 struct nfs_client *clp = ERR_PTR(-EIO);
843 struct nfs4_pnfs_ds_addr *da;
844 int status = 0;
845
846 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
847
848 if (!load_v3_ds_connect())
849 goto out;
850
851 list_for_each_entry(da, &ds->ds_addrs, da_node) {
852 dprintk("%s: DS %s: trying address %s\n",
853 __func__, ds->ds_remotestr, da->da_remotestr);
854
855 if (!IS_ERR(clp)) {
856 struct xprt_create xprt_args = {
857 .ident = XPRT_TRANSPORT_TCP,
858 .net = clp->cl_net,
859 .dstaddr = (struct sockaddr *)&da->da_addr,
860 .addrlen = da->da_addrlen,
861 .servername = clp->cl_hostname,
862 };
863 /* Add this address as an alias */
864 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
865 rpc_clnt_test_and_add_xprt, NULL);
866 continue;
867 }
868 clp = get_v3_ds_connect(mds_srv,
869 (struct sockaddr *)&da->da_addr,
870 da->da_addrlen, IPPROTO_TCP,
871 timeo, retrans);
872 if (IS_ERR(clp))
873 continue;
874 clp->cl_rpcclient->cl_softerr = 0;
875 clp->cl_rpcclient->cl_softrtry = 0;
876 }
877
878 if (IS_ERR(clp)) {
879 status = PTR_ERR(clp);
880 goto out;
881 }
882
883 smp_wmb();
884 ds->ds_clp = clp;
885 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
886out:
887 return status;
888}
889
890static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
891 struct nfs4_pnfs_ds *ds,
892 unsigned int timeo,
893 unsigned int retrans,
894 u32 minor_version)
895{
896 struct nfs_client *clp = ERR_PTR(-EIO);
897 struct nfs4_pnfs_ds_addr *da;
898 int status = 0;
899
900 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
901
902 list_for_each_entry(da, &ds->ds_addrs, da_node) {
903 dprintk("%s: DS %s: trying address %s\n",
904 __func__, ds->ds_remotestr, da->da_remotestr);
905
906 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) {
907 struct xprt_create xprt_args = {
908 .ident = XPRT_TRANSPORT_TCP,
909 .net = clp->cl_net,
910 .dstaddr = (struct sockaddr *)&da->da_addr,
911 .addrlen = da->da_addrlen,
912 .servername = clp->cl_hostname,
913 };
914 struct nfs4_add_xprt_data xprtdata = {
915 .clp = clp,
916 .cred = nfs4_get_clid_cred(clp),
917 };
918 struct rpc_add_xprt_test rpcdata = {
919 .add_xprt_test = clp->cl_mvops->session_trunk,
920 .data = &xprtdata,
921 };
922
923 /**
924 * Test this address for session trunking and
925 * add as an alias
926 */
927 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
928 rpc_clnt_setup_test_and_add_xprt,
929 &rpcdata);
930 if (xprtdata.cred)
931 put_cred(xprtdata.cred);
932 } else {
933 clp = nfs4_set_ds_client(mds_srv,
934 (struct sockaddr *)&da->da_addr,
935 da->da_addrlen, IPPROTO_TCP,
936 timeo, retrans, minor_version);
937 if (IS_ERR(clp))
938 continue;
939
940 status = nfs4_init_ds_session(clp,
941 mds_srv->nfs_client->cl_lease_time);
942 if (status) {
943 nfs_put_client(clp);
944 clp = ERR_PTR(-EIO);
945 continue;
946 }
947
948 }
949 }
950
951 if (IS_ERR(clp)) {
952 status = PTR_ERR(clp);
953 goto out;
954 }
955
956 smp_wmb();
957 ds->ds_clp = clp;
958 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
959out:
960 return status;
961}
962
963/*
964 * Create an rpc connection to the nfs4_pnfs_ds data server.
965 * Currently only supports IPv4 and IPv6 addresses.
966 * If connection fails, make devid unavailable and return a -errno.
967 */
968int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
969 struct nfs4_deviceid_node *devid, unsigned int timeo,
970 unsigned int retrans, u32 version, u32 minor_version)
971{
972 int err;
973
974again:
975 err = 0;
976 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
977 if (version == 3) {
978 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo,
979 retrans);
980 } else if (version == 4) {
981 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo,
982 retrans, minor_version);
983 } else {
984 dprintk("%s: unsupported DS version %d\n", __func__,
985 version);
986 err = -EPROTONOSUPPORT;
987 }
988
989 nfs4_clear_ds_conn_bit(ds);
990 } else {
991 nfs4_wait_ds_connect(ds);
992
993 /* what was waited on didn't connect AND didn't mark unavail */
994 if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid))
995 goto again;
996 }
997
998 /*
999 * At this point the ds->ds_clp should be ready, but it might have
1000 * hit an error.
1001 */
1002 if (!err) {
1003 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) {
1004 WARN_ON_ONCE(ds->ds_clp ||
1005 !nfs4_test_deviceid_unavailable(devid));
1006 return -EINVAL;
1007 }
1008 err = nfs_client_init_status(ds->ds_clp);
1009 }
1010
1011 return err;
1012}
1013EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
1014
1015/*
1016 * Currently only supports ipv4, ipv6 and one multi-path address.
1017 */
1018struct nfs4_pnfs_ds_addr *
1019nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags)
1020{
1021 struct nfs4_pnfs_ds_addr *da = NULL;
1022 char *buf, *portstr;
1023 __be16 port;
1024 int nlen, rlen;
1025 int tmp[2];
1026 __be32 *p;
1027 char *netid, *match_netid;
1028 size_t len, match_netid_len;
1029 char *startsep = "";
1030 char *endsep = "";
1031
1032
1033 /* r_netid */
1034 p = xdr_inline_decode(xdr, 4);
1035 if (unlikely(!p))
1036 goto out_err;
1037 nlen = be32_to_cpup(p++);
1038
1039 p = xdr_inline_decode(xdr, nlen);
1040 if (unlikely(!p))
1041 goto out_err;
1042
1043 netid = kmalloc(nlen+1, gfp_flags);
1044 if (unlikely(!netid))
1045 goto out_err;
1046
1047 netid[nlen] = '\0';
1048 memcpy(netid, p, nlen);
1049
1050 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
1051 p = xdr_inline_decode(xdr, 4);
1052 if (unlikely(!p))
1053 goto out_free_netid;
1054 rlen = be32_to_cpup(p);
1055
1056 p = xdr_inline_decode(xdr, rlen);
1057 if (unlikely(!p))
1058 goto out_free_netid;
1059
1060 /* port is ".ABC.DEF", 8 chars max */
1061 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) {
1062 dprintk("%s: Invalid address, length %d\n", __func__,
1063 rlen);
1064 goto out_free_netid;
1065 }
1066 buf = kmalloc(rlen + 1, gfp_flags);
1067 if (!buf) {
1068 dprintk("%s: Not enough memory\n", __func__);
1069 goto out_free_netid;
1070 }
1071 buf[rlen] = '\0';
1072 memcpy(buf, p, rlen);
1073
1074 /* replace port '.' with '-' */
1075 portstr = strrchr(buf, '.');
1076 if (!portstr) {
1077 dprintk("%s: Failed finding expected dot in port\n",
1078 __func__);
1079 goto out_free_buf;
1080 }
1081 *portstr = '-';
1082
1083 /* find '.' between address and port */
1084 portstr = strrchr(buf, '.');
1085 if (!portstr) {
1086 dprintk("%s: Failed finding expected dot between address and "
1087 "port\n", __func__);
1088 goto out_free_buf;
1089 }
1090 *portstr = '\0';
1091
1092 da = kzalloc(sizeof(*da), gfp_flags);
1093 if (unlikely(!da))
1094 goto out_free_buf;
1095
1096 INIT_LIST_HEAD(&da->da_node);
1097
1098 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
1099 sizeof(da->da_addr))) {
1100 dprintk("%s: error parsing address %s\n", __func__, buf);
1101 goto out_free_da;
1102 }
1103
1104 portstr++;
1105 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
1106 port = htons((tmp[0] << 8) | (tmp[1]));
1107
1108 switch (da->da_addr.ss_family) {
1109 case AF_INET:
1110 ((struct sockaddr_in *)&da->da_addr)->sin_port = port;
1111 da->da_addrlen = sizeof(struct sockaddr_in);
1112 match_netid = "tcp";
1113 match_netid_len = 3;
1114 break;
1115
1116 case AF_INET6:
1117 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
1118 da->da_addrlen = sizeof(struct sockaddr_in6);
1119 match_netid = "tcp6";
1120 match_netid_len = 4;
1121 startsep = "[";
1122 endsep = "]";
1123 break;
1124
1125 default:
1126 dprintk("%s: unsupported address family: %u\n",
1127 __func__, da->da_addr.ss_family);
1128 goto out_free_da;
1129 }
1130
1131 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) {
1132 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n",
1133 __func__, netid, match_netid);
1134 goto out_free_da;
1135 }
1136
1137 /* save human readable address */
1138 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
1139 da->da_remotestr = kzalloc(len, gfp_flags);
1140
1141 /* NULL is ok, only used for dprintk */
1142 if (da->da_remotestr)
1143 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
1144 buf, endsep, ntohs(port));
1145
1146 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
1147 kfree(buf);
1148 kfree(netid);
1149 return da;
1150
1151out_free_da:
1152 kfree(da);
1153out_free_buf:
1154 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
1155 kfree(buf);
1156out_free_netid:
1157 kfree(netid);
1158out_err:
1159 return NULL;
1160}
1161EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
1162
1163void
1164pnfs_layout_mark_request_commit(struct nfs_page *req,
1165 struct pnfs_layout_segment *lseg,
1166 struct nfs_commit_info *cinfo,
1167 u32 ds_commit_idx)
1168{
1169 struct list_head *list;
1170 struct pnfs_commit_array *array;
1171 struct pnfs_commit_bucket *bucket;
1172
1173 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
1174 array = pnfs_lookup_commit_array(cinfo->ds, lseg);
1175 if (!array || !pnfs_is_valid_lseg(lseg))
1176 goto out_resched;
1177 bucket = &array->buckets[ds_commit_idx];
1178 list = &bucket->written;
1179 /* Non-empty buckets hold a reference on the lseg. That ref
1180 * is normally transferred to the COMMIT call and released
1181 * there. It could also be released if the last req is pulled
1182 * off due to a rewrite, in which case it will be done in
1183 * pnfs_common_clear_request_commit
1184 */
1185 if (!bucket->lseg)
1186 bucket->lseg = pnfs_get_lseg(lseg);
1187 set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1188 cinfo->ds->nwritten++;
1189
1190 nfs_request_add_commit_list_locked(req, list, cinfo);
1191 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1192 nfs_mark_page_unstable(req->wb_page, cinfo);
1193 return;
1194out_resched:
1195 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1196 cinfo->completion_ops->resched_write(cinfo, req);
1197}
1198EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
1199
1200int
1201pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
1202{
1203 int ret;
1204
1205 if (!pnfs_layoutcommit_outstanding(inode))
1206 return 0;
1207 ret = nfs_commit_inode(inode, FLUSH_SYNC);
1208 if (ret < 0)
1209 return ret;
1210 if (datasync)
1211 return 0;
1212 return pnfs_layoutcommit_inode(inode, true);
1213}
1214EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
1215