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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 pnfs_layout_segment *
355pnfs_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
371static struct nfs_commit_data *
372pnfs_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
383static 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
403static unsigned int
404pnfs_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;
429out_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
436static unsigned int
437pnfs_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 */
459int
460pnfs_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, NULL);
494 } else {
495 nfs_init_commit(data, NULL, data->lseg, cinfo);
496 initiate_commit(data, how);
497 }
498 }
499out:
500 return PNFS_ATTEMPTED;
501}
502EXPORT_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 */
513static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
514static LIST_HEAD(nfs4_data_server_cache);
515
516/* Debug routines */
517static void
518print_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
533static bool
534same_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 */
580static 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 */
606static 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
617static 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
625static 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
632static 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
654void 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}
663EXPORT_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 */
669static char *
670nfs4_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;
709out_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 */
718struct nfs4_pnfs_ds *
719nfs4_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);
758out:
759 return ds;
760}
761EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
762
763static 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
769static 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
775static 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
783static 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
793void 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
801static 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);
858out:
859 return status;
860}
861
862static 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);
978out:
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 */
987int 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
1017connect_done:
1018 nfs4_clear_ds_conn_bit(ds);
1019out:
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}
1035EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
1036
1037/*
1038 * Currently only supports ipv4, ipv6 and one multi-path address.
1039 */
1040struct nfs4_pnfs_ds_addr *
1041nfs4_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
1140out_free_da:
1141 kfree(da);
1142out_free_buf:
1143 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
1144 kfree(buf);
1145out_free_netid:
1146 kfree(netid);
1147out_err:
1148 return NULL;
1149}
1150EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
1151
1152void
1153pnfs_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;
1183out_resched:
1184 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
1185 cinfo->completion_ops->resched_write(cinfo, req);
1186}
1187EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
1188
1189int
1190pnfs_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}
1203EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
1204
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