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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_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);
89out:
90 nfs_request_remove_commit_list(req, cinfo);
91 if (bucket)
92 pnfs_put_lseg(pnfs_free_bucket_lseg(bucket));
93}
94EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit);
95
96struct pnfs_commit_array *
97pnfs_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}
117EXPORT_SYMBOL_GPL(pnfs_alloc_commit_array);
118
119void
120pnfs_free_commit_array(struct pnfs_commit_array *p)
121{
122 kfree_rcu(p, rcu);
123}
124EXPORT_SYMBOL_GPL(pnfs_free_commit_array);
125
126static struct pnfs_commit_array *
127pnfs_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
139struct pnfs_commit_array *
140pnfs_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}
155EXPORT_SYMBOL_GPL(pnfs_add_commit_array);
156
157static struct pnfs_commit_array *
158pnfs_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
175static void
176pnfs_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
183static void
184pnfs_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
190static void
191pnfs_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
199static struct pnfs_commit_array *
200pnfs_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
207static void
208pnfs_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
215void
216pnfs_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}
224EXPORT_SYMBOL_GPL(pnfs_generic_ds_cinfo_release_lseg);
225
226void
227pnfs_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}
234EXPORT_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 */
240static int
241pnfs_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
258static 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 */
277int 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}
300EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
301
302static unsigned int
303pnfs_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
313restart:
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. */
329void 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}
352EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
353
354static struct nfs_page *
355pnfs_bucket_search_commit_reqs(struct pnfs_commit_bucket *buckets,
356 unsigned int nbuckets, struct page *page)
357{
358 struct nfs_page *req;
359 struct pnfs_commit_bucket *b;
360 unsigned int i;
361
362 /* Linearly search the commit lists for each bucket until a matching
363 * request is found */
364 for (i = 0, b = buckets; i < nbuckets; i++, b++) {
365 list_for_each_entry(req, &b->written, wb_list) {
366 if (req->wb_page == page)
367 return req->wb_head;
368 }
369 list_for_each_entry(req, &b->committing, wb_list) {
370 if (req->wb_page == page)
371 return req->wb_head;
372 }
373 }
374 return NULL;
375}
376
377/* pnfs_generic_search_commit_reqs - Search lists in @cinfo for the head request
378 * for @page
379 * @cinfo - commit info for current inode
380 * @page - page to search for matching head request
381 *
382 * Return: the head request if one is found, otherwise %NULL.
383 */
384struct nfs_page *
385pnfs_generic_search_commit_reqs(struct nfs_commit_info *cinfo, struct page *page)
386{
387 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
388 struct pnfs_commit_array *array;
389 struct nfs_page *req;
390
391 list_for_each_entry(array, &fl_cinfo->commits, cinfo_list) {
392 req = pnfs_bucket_search_commit_reqs(array->buckets,
393 array->nbuckets, page);
394 if (req)
395 return req;
396 }
397 return NULL;
398}
399EXPORT_SYMBOL_GPL(pnfs_generic_search_commit_reqs);
400
401static struct pnfs_layout_segment *
402pnfs_bucket_get_committing(struct list_head *head,
403 struct pnfs_commit_bucket *bucket,
404 struct nfs_commit_info *cinfo)
405{
406 struct pnfs_layout_segment *lseg;
407 struct list_head *pos;
408
409 list_for_each(pos, &bucket->committing)
410 cinfo->ds->ncommitting--;
411 list_splice_init(&bucket->committing, head);
412 lseg = pnfs_free_bucket_lseg(bucket);
413 if (!lseg)
414 lseg = pnfs_get_lseg(bucket->lseg);
415 return lseg;
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();
423
424 if (!data)
425 return NULL;
426 data->lseg = pnfs_bucket_get_committing(&data->pages, bucket, cinfo);
427 return data;
428}
429
430static void pnfs_generic_retry_commit(struct pnfs_commit_bucket *buckets,
431 unsigned int nbuckets,
432 struct nfs_commit_info *cinfo,
433 unsigned int idx)
434{
435 struct pnfs_commit_bucket *bucket;
436 struct pnfs_layout_segment *freeme;
437 LIST_HEAD(pages);
438
439 for (bucket = buckets; idx < nbuckets; bucket++, idx++) {
440 if (list_empty(&bucket->committing))
441 continue;
442 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
443 freeme = pnfs_bucket_get_committing(&pages, bucket, cinfo);
444 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
445 nfs_retry_commit(&pages, freeme, cinfo, idx);
446 pnfs_put_lseg(freeme);
447 }
448}
449
450static unsigned int
451pnfs_bucket_alloc_ds_commits(struct list_head *list,
452 struct pnfs_commit_bucket *buckets,
453 unsigned int nbuckets,
454 struct nfs_commit_info *cinfo)
455{
456 struct pnfs_commit_bucket *bucket;
457 struct nfs_commit_data *data;
458 unsigned int i;
459 unsigned int nreq = 0;
460
461 for (i = 0, bucket = buckets; i < nbuckets; i++, bucket++) {
462 if (list_empty(&bucket->committing))
463 continue;
464 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
465 if (!list_empty(&bucket->committing)) {
466 data = pnfs_bucket_fetch_commitdata(bucket, cinfo);
467 if (!data)
468 goto out_error;
469 data->ds_commit_index = i;
470 list_add_tail(&data->list, list);
471 nreq++;
472 }
473 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
474 }
475 return nreq;
476out_error:
477 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
478 /* Clean up on error */
479 pnfs_generic_retry_commit(buckets, nbuckets, cinfo, i);
480 return nreq;
481}
482
483static unsigned int
484pnfs_alloc_ds_commits_list(struct list_head *list,
485 struct pnfs_ds_commit_info *fl_cinfo,
486 struct nfs_commit_info *cinfo)
487{
488 struct pnfs_commit_array *array;
489 unsigned int ret = 0;
490
491 rcu_read_lock();
492 list_for_each_entry_rcu(array, &fl_cinfo->commits, cinfo_list) {
493 if (!array->lseg || !pnfs_get_commit_array(array))
494 continue;
495 rcu_read_unlock();
496 ret += pnfs_bucket_alloc_ds_commits(list, array->buckets,
497 array->nbuckets, cinfo);
498 rcu_read_lock();
499 pnfs_put_commit_array(array, cinfo->inode);
500 }
501 rcu_read_unlock();
502 return ret;
503}
504
505/* This follows nfs_commit_list pretty closely */
506int
507pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
508 int how, struct nfs_commit_info *cinfo,
509 int (*initiate_commit)(struct nfs_commit_data *data,
510 int how))
511{
512 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
513 struct nfs_commit_data *data, *tmp;
514 LIST_HEAD(list);
515 unsigned int nreq = 0;
516
517 if (!list_empty(mds_pages)) {
518 data = nfs_commitdata_alloc();
519 if (!data) {
520 nfs_retry_commit(mds_pages, NULL, cinfo, -1);
521 return -ENOMEM;
522 }
523 data->ds_commit_index = -1;
524 list_splice_init(mds_pages, &data->pages);
525 list_add_tail(&data->list, &list);
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 struct nfs4_pnfs_ds_addr *nfs4_pnfs_ds_addr_alloc(gfp_t gfp_flags)
665{
666 struct nfs4_pnfs_ds_addr *da = kzalloc(sizeof(*da), gfp_flags);
667 if (da)
668 INIT_LIST_HEAD(&da->da_node);
669 return da;
670}
671
672static void nfs4_pnfs_ds_addr_free(struct nfs4_pnfs_ds_addr *da)
673{
674 kfree(da->da_remotestr);
675 kfree(da->da_netid);
676 kfree(da);
677}
678
679static void destroy_ds(struct nfs4_pnfs_ds *ds)
680{
681 struct nfs4_pnfs_ds_addr *da;
682
683 dprintk("--> %s\n", __func__);
684 ifdebug(FACILITY)
685 print_ds(ds);
686
687 nfs_put_client(ds->ds_clp);
688
689 while (!list_empty(&ds->ds_addrs)) {
690 da = list_first_entry(&ds->ds_addrs,
691 struct nfs4_pnfs_ds_addr,
692 da_node);
693 list_del_init(&da->da_node);
694 nfs4_pnfs_ds_addr_free(da);
695 }
696
697 kfree(ds->ds_remotestr);
698 kfree(ds);
699}
700
701void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds)
702{
703 if (refcount_dec_and_lock(&ds->ds_count,
704 &nfs4_ds_cache_lock)) {
705 list_del_init(&ds->ds_node);
706 spin_unlock(&nfs4_ds_cache_lock);
707 destroy_ds(ds);
708 }
709}
710EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put);
711
712/*
713 * Create a string with a human readable address and port to avoid
714 * complicated setup around many dprinks.
715 */
716static char *
717nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
718{
719 struct nfs4_pnfs_ds_addr *da;
720 char *remotestr;
721 size_t len;
722 char *p;
723
724 len = 3; /* '{', '}' and eol */
725 list_for_each_entry(da, dsaddrs, da_node) {
726 len += strlen(da->da_remotestr) + 1; /* string plus comma */
727 }
728
729 remotestr = kzalloc(len, gfp_flags);
730 if (!remotestr)
731 return NULL;
732
733 p = remotestr;
734 *(p++) = '{';
735 len--;
736 list_for_each_entry(da, dsaddrs, da_node) {
737 size_t ll = strlen(da->da_remotestr);
738
739 if (ll > len)
740 goto out_err;
741
742 memcpy(p, da->da_remotestr, ll);
743 p += ll;
744 len -= ll;
745
746 if (len < 1)
747 goto out_err;
748 (*p++) = ',';
749 len--;
750 }
751 if (len < 2)
752 goto out_err;
753 *(p++) = '}';
754 *p = '\0';
755 return remotestr;
756out_err:
757 kfree(remotestr);
758 return NULL;
759}
760
761/*
762 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if
763 * uncached and return cached struct nfs4_pnfs_ds.
764 */
765struct nfs4_pnfs_ds *
766nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
767{
768 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
769 char *remotestr;
770
771 if (list_empty(dsaddrs)) {
772 dprintk("%s: no addresses defined\n", __func__);
773 goto out;
774 }
775
776 ds = kzalloc(sizeof(*ds), gfp_flags);
777 if (!ds)
778 goto out;
779
780 /* this is only used for debugging, so it's ok if its NULL */
781 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
782
783 spin_lock(&nfs4_ds_cache_lock);
784 tmp_ds = _data_server_lookup_locked(dsaddrs);
785 if (tmp_ds == NULL) {
786 INIT_LIST_HEAD(&ds->ds_addrs);
787 list_splice_init(dsaddrs, &ds->ds_addrs);
788 ds->ds_remotestr = remotestr;
789 refcount_set(&ds->ds_count, 1);
790 INIT_LIST_HEAD(&ds->ds_node);
791 ds->ds_clp = NULL;
792 list_add(&ds->ds_node, &nfs4_data_server_cache);
793 dprintk("%s add new data server %s\n", __func__,
794 ds->ds_remotestr);
795 } else {
796 kfree(remotestr);
797 kfree(ds);
798 refcount_inc(&tmp_ds->ds_count);
799 dprintk("%s data server %s found, inc'ed ds_count to %d\n",
800 __func__, tmp_ds->ds_remotestr,
801 refcount_read(&tmp_ds->ds_count));
802 ds = tmp_ds;
803 }
804 spin_unlock(&nfs4_ds_cache_lock);
805out:
806 return ds;
807}
808EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
809
810static int nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
811{
812 might_sleep();
813 return wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, TASK_KILLABLE);
814}
815
816static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
817{
818 smp_mb__before_atomic();
819 clear_and_wake_up_bit(NFS4DS_CONNECTING, &ds->ds_state);
820}
821
822static struct nfs_client *(*get_v3_ds_connect)(
823 struct nfs_server *mds_srv,
824 const struct sockaddr_storage *ds_addr,
825 int ds_addrlen,
826 int ds_proto,
827 unsigned int ds_timeo,
828 unsigned int ds_retrans);
829
830static bool load_v3_ds_connect(void)
831{
832 if (!get_v3_ds_connect) {
833 get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
834 WARN_ON_ONCE(!get_v3_ds_connect);
835 }
836
837 return(get_v3_ds_connect != NULL);
838}
839
840void nfs4_pnfs_v3_ds_connect_unload(void)
841{
842 if (get_v3_ds_connect) {
843 symbol_put(nfs3_set_ds_client);
844 get_v3_ds_connect = NULL;
845 }
846}
847
848static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
849 struct nfs4_pnfs_ds *ds,
850 unsigned int timeo,
851 unsigned int retrans)
852{
853 struct nfs_client *clp = ERR_PTR(-EIO);
854 struct nfs4_pnfs_ds_addr *da;
855 int status = 0;
856
857 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
858
859 if (!load_v3_ds_connect())
860 return -EPROTONOSUPPORT;
861
862 list_for_each_entry(da, &ds->ds_addrs, da_node) {
863 dprintk("%s: DS %s: trying address %s\n",
864 __func__, ds->ds_remotestr, da->da_remotestr);
865
866 if (!IS_ERR(clp)) {
867 struct xprt_create xprt_args = {
868 .ident = da->da_transport,
869 .net = clp->cl_net,
870 .dstaddr = (struct sockaddr *)&da->da_addr,
871 .addrlen = da->da_addrlen,
872 .servername = clp->cl_hostname,
873 };
874
875 if (da->da_transport != clp->cl_proto)
876 continue;
877 if (da->da_addr.ss_family != clp->cl_addr.ss_family)
878 continue;
879 /* Add this address as an alias */
880 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
881 rpc_clnt_test_and_add_xprt, NULL);
882 continue;
883 }
884 clp = get_v3_ds_connect(mds_srv,
885 &da->da_addr,
886 da->da_addrlen, da->da_transport,
887 timeo, retrans);
888 if (IS_ERR(clp))
889 continue;
890 clp->cl_rpcclient->cl_softerr = 0;
891 clp->cl_rpcclient->cl_softrtry = 0;
892 }
893
894 if (IS_ERR(clp)) {
895 status = PTR_ERR(clp);
896 goto out;
897 }
898
899 smp_wmb();
900 WRITE_ONCE(ds->ds_clp, clp);
901 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
902out:
903 return status;
904}
905
906static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
907 struct nfs4_pnfs_ds *ds,
908 unsigned int timeo,
909 unsigned int retrans,
910 u32 minor_version)
911{
912 struct nfs_client *clp = ERR_PTR(-EIO);
913 struct nfs4_pnfs_ds_addr *da;
914 int status = 0;
915
916 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
917
918 list_for_each_entry(da, &ds->ds_addrs, da_node) {
919 dprintk("%s: DS %s: trying address %s\n",
920 __func__, ds->ds_remotestr, da->da_remotestr);
921
922 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) {
923 struct xprt_create xprt_args = {
924 .ident = da->da_transport,
925 .net = clp->cl_net,
926 .dstaddr = (struct sockaddr *)&da->da_addr,
927 .addrlen = da->da_addrlen,
928 .servername = clp->cl_hostname,
929 };
930 struct nfs4_add_xprt_data xprtdata = {
931 .clp = clp,
932 };
933 struct rpc_add_xprt_test rpcdata = {
934 .add_xprt_test = clp->cl_mvops->session_trunk,
935 .data = &xprtdata,
936 };
937
938 if (da->da_transport != clp->cl_proto)
939 continue;
940 if (da->da_addr.ss_family != clp->cl_addr.ss_family)
941 continue;
942 /**
943 * Test this address for session trunking and
944 * add as an alias
945 */
946 xprtdata.cred = nfs4_get_clid_cred(clp),
947 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
948 rpc_clnt_setup_test_and_add_xprt,
949 &rpcdata);
950 if (xprtdata.cred)
951 put_cred(xprtdata.cred);
952 } else {
953 clp = nfs4_set_ds_client(mds_srv,
954 &da->da_addr,
955 da->da_addrlen,
956 da->da_transport, timeo,
957 retrans, minor_version);
958 if (IS_ERR(clp))
959 continue;
960
961 status = nfs4_init_ds_session(clp,
962 mds_srv->nfs_client->cl_lease_time);
963 if (status) {
964 nfs_put_client(clp);
965 clp = ERR_PTR(-EIO);
966 continue;
967 }
968
969 }
970 }
971
972 if (IS_ERR(clp)) {
973 status = PTR_ERR(clp);
974 goto out;
975 }
976
977 smp_wmb();
978 WRITE_ONCE(ds->ds_clp, clp);
979 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
980out:
981 return status;
982}
983
984/*
985 * Create an rpc connection to the nfs4_pnfs_ds data server.
986 * Currently only supports IPv4 and IPv6 addresses.
987 * If connection fails, make devid unavailable and return a -errno.
988 */
989int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
990 struct nfs4_deviceid_node *devid, unsigned int timeo,
991 unsigned int retrans, u32 version, u32 minor_version)
992{
993 int err;
994
995 do {
996 err = nfs4_wait_ds_connect(ds);
997 if (err || ds->ds_clp)
998 goto out;
999 if (nfs4_test_deviceid_unavailable(devid))
1000 return -ENODEV;
1001 } while (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) != 0);
1002
1003 if (ds->ds_clp)
1004 goto connect_done;
1005
1006 switch (version) {
1007 case 3:
1008 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, retrans);
1009 break;
1010 case 4:
1011 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, retrans,
1012 minor_version);
1013 break;
1014 default:
1015 dprintk("%s: unsupported DS version %d\n", __func__, version);
1016 err = -EPROTONOSUPPORT;
1017 }
1018
1019connect_done:
1020 nfs4_clear_ds_conn_bit(ds);
1021out:
1022 /*
1023 * At this point the ds->ds_clp should be ready, but it might have
1024 * hit an error.
1025 */
1026 if (!err) {
1027 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) {
1028 WARN_ON_ONCE(ds->ds_clp ||
1029 !nfs4_test_deviceid_unavailable(devid));
1030 return -EINVAL;
1031 }
1032 err = nfs_client_init_status(ds->ds_clp);
1033 }
1034
1035 return err;
1036}
1037EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
1038
1039/*
1040 * Currently only supports ipv4, ipv6 and one multi-path address.
1041 */
1042struct nfs4_pnfs_ds_addr *
1043nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags)
1044{
1045 struct nfs4_pnfs_ds_addr *da = NULL;
1046 char *buf, *portstr;
1047 __be16 port;
1048 ssize_t nlen, rlen;
1049 int tmp[2];
1050 char *netid;
1051 size_t len;
1052 char *startsep = "";
1053 char *endsep = "";
1054
1055
1056 /* r_netid */
1057 nlen = xdr_stream_decode_string_dup(xdr, &netid, XDR_MAX_NETOBJ,
1058 gfp_flags);
1059 if (unlikely(nlen < 0))
1060 goto out_err;
1061
1062 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
1063 /* port is ".ABC.DEF", 8 chars max */
1064 rlen = xdr_stream_decode_string_dup(xdr, &buf, INET6_ADDRSTRLEN +
1065 IPV6_SCOPE_ID_LEN + 8, gfp_flags);
1066 if (unlikely(rlen < 0))
1067 goto out_free_netid;
1068
1069 /* replace port '.' with '-' */
1070 portstr = strrchr(buf, '.');
1071 if (!portstr) {
1072 dprintk("%s: Failed finding expected dot in port\n",
1073 __func__);
1074 goto out_free_buf;
1075 }
1076 *portstr = '-';
1077
1078 /* find '.' between address and port */
1079 portstr = strrchr(buf, '.');
1080 if (!portstr) {
1081 dprintk("%s: Failed finding expected dot between address and "
1082 "port\n", __func__);
1083 goto out_free_buf;
1084 }
1085 *portstr = '\0';
1086
1087 da = nfs4_pnfs_ds_addr_alloc(gfp_flags);
1088 if (unlikely(!da))
1089 goto out_free_buf;
1090
1091 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
1092 sizeof(da->da_addr))) {
1093 dprintk("%s: error parsing address %s\n", __func__, buf);
1094 goto out_free_da;
1095 }
1096
1097 portstr++;
1098 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
1099 port = htons((tmp[0] << 8) | (tmp[1]));
1100
1101 switch (da->da_addr.ss_family) {
1102 case AF_INET:
1103 ((struct sockaddr_in *)&da->da_addr)->sin_port = port;
1104 da->da_addrlen = sizeof(struct sockaddr_in);
1105 break;
1106
1107 case AF_INET6:
1108 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
1109 da->da_addrlen = sizeof(struct sockaddr_in6);
1110 startsep = "[";
1111 endsep = "]";
1112 break;
1113
1114 default:
1115 dprintk("%s: unsupported address family: %u\n",
1116 __func__, da->da_addr.ss_family);
1117 goto out_free_da;
1118 }
1119
1120 da->da_transport = xprt_find_transport_ident(netid);
1121 if (da->da_transport < 0) {
1122 dprintk("%s: ERROR: unknown r_netid \"%s\"\n",
1123 __func__, netid);
1124 goto out_free_da;
1125 }
1126
1127 da->da_netid = netid;
1128
1129 /* save human readable address */
1130 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
1131 da->da_remotestr = kzalloc(len, gfp_flags);
1132
1133 /* NULL is ok, only used for dprintk */
1134 if (da->da_remotestr)
1135 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
1136 buf, endsep, ntohs(port));
1137
1138 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
1139 kfree(buf);
1140 return da;
1141
1142out_free_da:
1143 kfree(da);
1144out_free_buf:
1145 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
1146 kfree(buf);
1147out_free_netid:
1148 kfree(netid);
1149out_err:
1150 return NULL;
1151}
1152EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
1153
1154void
1155pnfs_layout_mark_request_commit(struct nfs_page *req,
1156 struct pnfs_layout_segment *lseg,
1157 struct nfs_commit_info *cinfo,
1158 u32 ds_commit_idx)
1159{
1160 struct list_head *list;
1161 struct pnfs_commit_array *array;
1162 struct pnfs_commit_bucket *bucket;
1163
1164 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
1165 array = pnfs_lookup_commit_array(cinfo->ds, lseg);
1166 if (!array || !pnfs_is_valid_lseg(lseg))
1167 goto out_resched;
1168 bucket = &array->buckets[ds_commit_idx];
1169 list = &bucket->written;
1170 /* Non-empty buckets hold a reference on the lseg. That ref
1171 * is normally transferred to the COMMIT call and released
1172 * there. It could also be released if the last req is pulled
1173 * off due to a rewrite, in which case it will be done in
1174 * pnfs_common_clear_request_commit
1175 */
1176 if (!bucket->lseg)
1177 bucket->lseg = pnfs_get_lseg(lseg);
1178 set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
1179 cinfo->ds->nwritten++;
1180
1181 nfs_request_add_commit_list_locked(req, list, cinfo);
1182 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1183 nfs_mark_page_unstable(req->wb_page, cinfo);
1184 return;
1185out_resched:
1186 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1187 cinfo->completion_ops->resched_write(cinfo, req);
1188}
1189EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
1190
1191int
1192pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
1193{
1194 int ret;
1195
1196 if (!pnfs_layoutcommit_outstanding(inode))
1197 return 0;
1198 ret = nfs_commit_inode(inode, FLUSH_SYNC);
1199 if (ret < 0)
1200 return ret;
1201 if (datasync)
1202 return 0;
1203 return pnfs_layoutcommit_inode(inode, true);
1204}
1205EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
1206