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1/*
2 * Common NFS I/O operations for the pnfs file based
3 * layout drivers.
4 *
5 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
6 *
7 * Tom Haynes <loghyr@primarydata.com>
8 */
9
10#include <linux/nfs_fs.h>
11#include <linux/nfs_page.h>
12#include <linux/sunrpc/addr.h>
13#include <linux/module.h>
14
15#include "nfs4session.h"
16#include "internal.h"
17#include "pnfs.h"
18
19#define NFSDBG_FACILITY NFSDBG_PNFS
20
21void pnfs_generic_rw_release(void *data)
22{
23 struct nfs_pgio_header *hdr = data;
24
25 nfs_put_client(hdr->ds_clp);
26 hdr->mds_ops->rpc_release(data);
27}
28EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
29
30/* Fake up some data that will cause nfs_commit_release to retry the writes. */
31void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data)
32{
33 struct nfs_page *first = nfs_list_entry(data->pages.next);
34
35 data->task.tk_status = 0;
36 memcpy(&data->verf.verifier, &first->wb_verf,
37 sizeof(data->verf.verifier));
38 data->verf.verifier.data[0]++; /* ensure verifier mismatch */
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
62/* The generic layer is about to remove the req from the commit list.
63 * If this will make the bucket empty, it will need to put the lseg reference.
64 * Note this must be called holding i_lock
65 */
66void
67pnfs_generic_clear_request_commit(struct nfs_page *req,
68 struct nfs_commit_info *cinfo)
69{
70 struct pnfs_layout_segment *freeme = NULL;
71
72 if (!test_and_clear_bit(PG_COMMIT_TO_DS, &req->wb_flags))
73 goto out;
74 cinfo->ds->nwritten--;
75 if (list_is_singular(&req->wb_list)) {
76 struct pnfs_commit_bucket *bucket;
77
78 bucket = list_first_entry(&req->wb_list,
79 struct pnfs_commit_bucket,
80 written);
81 freeme = bucket->wlseg;
82 bucket->wlseg = NULL;
83 }
84out:
85 nfs_request_remove_commit_list(req, cinfo);
86 pnfs_put_lseg_locked(freeme);
87}
88EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit);
89
90static int
91pnfs_generic_transfer_commit_list(struct list_head *src, struct list_head *dst,
92 struct nfs_commit_info *cinfo, int max)
93{
94 struct nfs_page *req, *tmp;
95 int ret = 0;
96
97 list_for_each_entry_safe(req, tmp, src, wb_list) {
98 if (!nfs_lock_request(req))
99 continue;
100 kref_get(&req->wb_kref);
101 if (cond_resched_lock(&cinfo->inode->i_lock))
102 list_safe_reset_next(req, tmp, wb_list);
103 nfs_request_remove_commit_list(req, cinfo);
104 clear_bit(PG_COMMIT_TO_DS, &req->wb_flags);
105 nfs_list_add_request(req, dst);
106 ret++;
107 if ((ret == max) && !cinfo->dreq)
108 break;
109 }
110 return ret;
111}
112
113static int
114pnfs_generic_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
115 struct nfs_commit_info *cinfo,
116 int max)
117{
118 struct list_head *src = &bucket->written;
119 struct list_head *dst = &bucket->committing;
120 int ret;
121
122 lockdep_assert_held(&cinfo->inode->i_lock);
123 ret = pnfs_generic_transfer_commit_list(src, dst, cinfo, max);
124 if (ret) {
125 cinfo->ds->nwritten -= ret;
126 cinfo->ds->ncommitting += ret;
127 if (bucket->clseg == NULL)
128 bucket->clseg = pnfs_get_lseg(bucket->wlseg);
129 if (list_empty(src)) {
130 pnfs_put_lseg_locked(bucket->wlseg);
131 bucket->wlseg = NULL;
132 }
133 }
134 return ret;
135}
136
137/* Move reqs from written to committing lists, returning count
138 * of number moved.
139 */
140int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo,
141 int max)
142{
143 int i, rv = 0, cnt;
144
145 lockdep_assert_held(&cinfo->inode->i_lock);
146 for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
147 cnt = pnfs_generic_scan_ds_commit_list(&cinfo->ds->buckets[i],
148 cinfo, max);
149 max -= cnt;
150 rv += cnt;
151 }
152 return rv;
153}
154EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
155
156/* Pull everything off the committing lists and dump into @dst. */
157void pnfs_generic_recover_commit_reqs(struct list_head *dst,
158 struct nfs_commit_info *cinfo)
159{
160 struct pnfs_commit_bucket *b;
161 struct pnfs_layout_segment *freeme;
162 int i;
163
164 lockdep_assert_held(&cinfo->inode->i_lock);
165restart:
166 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
167 if (pnfs_generic_transfer_commit_list(&b->written, dst,
168 cinfo, 0)) {
169 freeme = b->wlseg;
170 b->wlseg = NULL;
171 spin_unlock(&cinfo->inode->i_lock);
172 pnfs_put_lseg(freeme);
173 spin_lock(&cinfo->inode->i_lock);
174 goto restart;
175 }
176 }
177 cinfo->ds->nwritten = 0;
178}
179EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
180
181static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx)
182{
183 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
184 struct pnfs_commit_bucket *bucket;
185 struct pnfs_layout_segment *freeme;
186 LIST_HEAD(pages);
187 int i;
188
189 spin_lock(&cinfo->inode->i_lock);
190 for (i = idx; i < fl_cinfo->nbuckets; i++) {
191 bucket = &fl_cinfo->buckets[i];
192 if (list_empty(&bucket->committing))
193 continue;
194 freeme = bucket->clseg;
195 bucket->clseg = NULL;
196 list_splice_init(&bucket->committing, &pages);
197 spin_unlock(&cinfo->inode->i_lock);
198 nfs_retry_commit(&pages, freeme, cinfo, i);
199 pnfs_put_lseg(freeme);
200 spin_lock(&cinfo->inode->i_lock);
201 }
202 spin_unlock(&cinfo->inode->i_lock);
203}
204
205static unsigned int
206pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo,
207 struct list_head *list)
208{
209 struct pnfs_ds_commit_info *fl_cinfo;
210 struct pnfs_commit_bucket *bucket;
211 struct nfs_commit_data *data;
212 int i;
213 unsigned int nreq = 0;
214
215 fl_cinfo = cinfo->ds;
216 bucket = fl_cinfo->buckets;
217 for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
218 if (list_empty(&bucket->committing))
219 continue;
220 data = nfs_commitdata_alloc();
221 if (!data)
222 break;
223 data->ds_commit_index = i;
224 list_add(&data->pages, list);
225 nreq++;
226 }
227
228 /* Clean up on error */
229 pnfs_generic_retry_commit(cinfo, i);
230 return nreq;
231}
232
233static inline
234void pnfs_fetch_commit_bucket_list(struct list_head *pages,
235 struct nfs_commit_data *data,
236 struct nfs_commit_info *cinfo)
237{
238 struct pnfs_commit_bucket *bucket;
239
240 bucket = &cinfo->ds->buckets[data->ds_commit_index];
241 spin_lock(&cinfo->inode->i_lock);
242 list_splice_init(&bucket->committing, pages);
243 data->lseg = bucket->clseg;
244 bucket->clseg = NULL;
245 spin_unlock(&cinfo->inode->i_lock);
246
247}
248
249/* Helper function for pnfs_generic_commit_pagelist to catch an empty
250 * page list. This can happen when two commits race.
251 *
252 * This must be called instead of nfs_init_commit - call one or the other, but
253 * not both!
254 */
255static bool
256pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages,
257 struct nfs_commit_data *data,
258 struct nfs_commit_info *cinfo)
259{
260 if (list_empty(pages)) {
261 if (atomic_dec_and_test(&cinfo->mds->rpcs_out))
262 wake_up_atomic_t(&cinfo->mds->rpcs_out);
263 /* don't call nfs_commitdata_release - it tries to put
264 * the open_context which is not acquired until nfs_init_commit
265 * which has not been called on @data */
266 WARN_ON_ONCE(data->context);
267 nfs_commit_free(data);
268 return true;
269 }
270
271 return false;
272}
273
274/* This follows nfs_commit_list pretty closely */
275int
276pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
277 int how, struct nfs_commit_info *cinfo,
278 int (*initiate_commit)(struct nfs_commit_data *data,
279 int how))
280{
281 struct nfs_commit_data *data, *tmp;
282 LIST_HEAD(list);
283 unsigned int nreq = 0;
284
285 if (!list_empty(mds_pages)) {
286 data = nfs_commitdata_alloc();
287 if (data != NULL) {
288 data->ds_commit_index = -1;
289 list_add(&data->pages, &list);
290 nreq++;
291 } else {
292 nfs_retry_commit(mds_pages, NULL, cinfo, 0);
293 pnfs_generic_retry_commit(cinfo, 0);
294 return -ENOMEM;
295 }
296 }
297
298 nreq += pnfs_generic_alloc_ds_commits(cinfo, &list);
299
300 if (nreq == 0)
301 goto out;
302
303 atomic_add(nreq, &cinfo->mds->rpcs_out);
304
305 list_for_each_entry_safe(data, tmp, &list, pages) {
306 list_del_init(&data->pages);
307 if (data->ds_commit_index < 0) {
308 /* another commit raced with us */
309 if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages,
310 data, cinfo))
311 continue;
312
313 nfs_init_commit(data, mds_pages, NULL, cinfo);
314 nfs_initiate_commit(NFS_CLIENT(inode), data,
315 NFS_PROTO(data->inode),
316 data->mds_ops, how, 0);
317 } else {
318 LIST_HEAD(pages);
319
320 pnfs_fetch_commit_bucket_list(&pages, data, cinfo);
321
322 /* another commit raced with us */
323 if (pnfs_generic_commit_cancel_empty_pagelist(&pages,
324 data, cinfo))
325 continue;
326
327 nfs_init_commit(data, &pages, data->lseg, cinfo);
328 initiate_commit(data, how);
329 }
330 }
331out:
332 cinfo->ds->ncommitting = 0;
333 return PNFS_ATTEMPTED;
334}
335EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist);
336
337/*
338 * Data server cache
339 *
340 * Data servers can be mapped to different device ids.
341 * nfs4_pnfs_ds reference counting
342 * - set to 1 on allocation
343 * - incremented when a device id maps a data server already in the cache.
344 * - decremented when deviceid is removed from the cache.
345 */
346static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
347static LIST_HEAD(nfs4_data_server_cache);
348
349/* Debug routines */
350static void
351print_ds(struct nfs4_pnfs_ds *ds)
352{
353 if (ds == NULL) {
354 printk(KERN_WARNING "%s NULL device\n", __func__);
355 return;
356 }
357 printk(KERN_WARNING " ds %s\n"
358 " ref count %d\n"
359 " client %p\n"
360 " cl_exchange_flags %x\n",
361 ds->ds_remotestr,
362 atomic_read(&ds->ds_count), ds->ds_clp,
363 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
364}
365
366static bool
367same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
368{
369 struct sockaddr_in *a, *b;
370 struct sockaddr_in6 *a6, *b6;
371
372 if (addr1->sa_family != addr2->sa_family)
373 return false;
374
375 switch (addr1->sa_family) {
376 case AF_INET:
377 a = (struct sockaddr_in *)addr1;
378 b = (struct sockaddr_in *)addr2;
379
380 if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
381 a->sin_port == b->sin_port)
382 return true;
383 break;
384
385 case AF_INET6:
386 a6 = (struct sockaddr_in6 *)addr1;
387 b6 = (struct sockaddr_in6 *)addr2;
388
389 /* LINKLOCAL addresses must have matching scope_id */
390 if (ipv6_addr_src_scope(&a6->sin6_addr) ==
391 IPV6_ADDR_SCOPE_LINKLOCAL &&
392 a6->sin6_scope_id != b6->sin6_scope_id)
393 return false;
394
395 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
396 a6->sin6_port == b6->sin6_port)
397 return true;
398 break;
399
400 default:
401 dprintk("%s: unhandled address family: %u\n",
402 __func__, addr1->sa_family);
403 return false;
404 }
405
406 return false;
407}
408
409/*
410 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does,
411 * declare a match.
412 */
413static bool
414_same_data_server_addrs_locked(const struct list_head *dsaddrs1,
415 const struct list_head *dsaddrs2)
416{
417 struct nfs4_pnfs_ds_addr *da1, *da2;
418 struct sockaddr *sa1, *sa2;
419 bool match = false;
420
421 list_for_each_entry(da1, dsaddrs1, da_node) {
422 sa1 = (struct sockaddr *)&da1->da_addr;
423 match = false;
424 list_for_each_entry(da2, dsaddrs2, da_node) {
425 sa2 = (struct sockaddr *)&da2->da_addr;
426 match = same_sockaddr(sa1, sa2);
427 if (match)
428 break;
429 }
430 if (!match)
431 break;
432 }
433 return match;
434}
435
436/*
437 * Lookup DS by addresses. nfs4_ds_cache_lock is held
438 */
439static struct nfs4_pnfs_ds *
440_data_server_lookup_locked(const struct list_head *dsaddrs)
441{
442 struct nfs4_pnfs_ds *ds;
443
444 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
445 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
446 return ds;
447 return NULL;
448}
449
450static void destroy_ds(struct nfs4_pnfs_ds *ds)
451{
452 struct nfs4_pnfs_ds_addr *da;
453
454 dprintk("--> %s\n", __func__);
455 ifdebug(FACILITY)
456 print_ds(ds);
457
458 nfs_put_client(ds->ds_clp);
459
460 while (!list_empty(&ds->ds_addrs)) {
461 da = list_first_entry(&ds->ds_addrs,
462 struct nfs4_pnfs_ds_addr,
463 da_node);
464 list_del_init(&da->da_node);
465 kfree(da->da_remotestr);
466 kfree(da);
467 }
468
469 kfree(ds->ds_remotestr);
470 kfree(ds);
471}
472
473void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds)
474{
475 if (atomic_dec_and_lock(&ds->ds_count,
476 &nfs4_ds_cache_lock)) {
477 list_del_init(&ds->ds_node);
478 spin_unlock(&nfs4_ds_cache_lock);
479 destroy_ds(ds);
480 }
481}
482EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put);
483
484/*
485 * Create a string with a human readable address and port to avoid
486 * complicated setup around many dprinks.
487 */
488static char *
489nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
490{
491 struct nfs4_pnfs_ds_addr *da;
492 char *remotestr;
493 size_t len;
494 char *p;
495
496 len = 3; /* '{', '}' and eol */
497 list_for_each_entry(da, dsaddrs, da_node) {
498 len += strlen(da->da_remotestr) + 1; /* string plus comma */
499 }
500
501 remotestr = kzalloc(len, gfp_flags);
502 if (!remotestr)
503 return NULL;
504
505 p = remotestr;
506 *(p++) = '{';
507 len--;
508 list_for_each_entry(da, dsaddrs, da_node) {
509 size_t ll = strlen(da->da_remotestr);
510
511 if (ll > len)
512 goto out_err;
513
514 memcpy(p, da->da_remotestr, ll);
515 p += ll;
516 len -= ll;
517
518 if (len < 1)
519 goto out_err;
520 (*p++) = ',';
521 len--;
522 }
523 if (len < 2)
524 goto out_err;
525 *(p++) = '}';
526 *p = '\0';
527 return remotestr;
528out_err:
529 kfree(remotestr);
530 return NULL;
531}
532
533/*
534 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if
535 * uncached and return cached struct nfs4_pnfs_ds.
536 */
537struct nfs4_pnfs_ds *
538nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
539{
540 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
541 char *remotestr;
542
543 if (list_empty(dsaddrs)) {
544 dprintk("%s: no addresses defined\n", __func__);
545 goto out;
546 }
547
548 ds = kzalloc(sizeof(*ds), gfp_flags);
549 if (!ds)
550 goto out;
551
552 /* this is only used for debugging, so it's ok if its NULL */
553 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
554
555 spin_lock(&nfs4_ds_cache_lock);
556 tmp_ds = _data_server_lookup_locked(dsaddrs);
557 if (tmp_ds == NULL) {
558 INIT_LIST_HEAD(&ds->ds_addrs);
559 list_splice_init(dsaddrs, &ds->ds_addrs);
560 ds->ds_remotestr = remotestr;
561 atomic_set(&ds->ds_count, 1);
562 INIT_LIST_HEAD(&ds->ds_node);
563 ds->ds_clp = NULL;
564 list_add(&ds->ds_node, &nfs4_data_server_cache);
565 dprintk("%s add new data server %s\n", __func__,
566 ds->ds_remotestr);
567 } else {
568 kfree(remotestr);
569 kfree(ds);
570 atomic_inc(&tmp_ds->ds_count);
571 dprintk("%s data server %s found, inc'ed ds_count to %d\n",
572 __func__, tmp_ds->ds_remotestr,
573 atomic_read(&tmp_ds->ds_count));
574 ds = tmp_ds;
575 }
576 spin_unlock(&nfs4_ds_cache_lock);
577out:
578 return ds;
579}
580EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
581
582static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
583{
584 might_sleep();
585 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING,
586 TASK_KILLABLE);
587}
588
589static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
590{
591 smp_mb__before_atomic();
592 clear_bit(NFS4DS_CONNECTING, &ds->ds_state);
593 smp_mb__after_atomic();
594 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING);
595}
596
597static struct nfs_client *(*get_v3_ds_connect)(
598 struct nfs_server *mds_srv,
599 const struct sockaddr *ds_addr,
600 int ds_addrlen,
601 int ds_proto,
602 unsigned int ds_timeo,
603 unsigned int ds_retrans);
604
605static bool load_v3_ds_connect(void)
606{
607 if (!get_v3_ds_connect) {
608 get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
609 WARN_ON_ONCE(!get_v3_ds_connect);
610 }
611
612 return(get_v3_ds_connect != NULL);
613}
614
615void nfs4_pnfs_v3_ds_connect_unload(void)
616{
617 if (get_v3_ds_connect) {
618 symbol_put(nfs3_set_ds_client);
619 get_v3_ds_connect = NULL;
620 }
621}
622EXPORT_SYMBOL_GPL(nfs4_pnfs_v3_ds_connect_unload);
623
624static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
625 struct nfs4_pnfs_ds *ds,
626 unsigned int timeo,
627 unsigned int retrans)
628{
629 struct nfs_client *clp = ERR_PTR(-EIO);
630 struct nfs4_pnfs_ds_addr *da;
631 int status = 0;
632
633 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
634
635 if (!load_v3_ds_connect())
636 goto out;
637
638 list_for_each_entry(da, &ds->ds_addrs, da_node) {
639 dprintk("%s: DS %s: trying address %s\n",
640 __func__, ds->ds_remotestr, da->da_remotestr);
641
642 if (!IS_ERR(clp)) {
643 struct xprt_create xprt_args = {
644 .ident = XPRT_TRANSPORT_TCP,
645 .net = clp->cl_net,
646 .dstaddr = (struct sockaddr *)&da->da_addr,
647 .addrlen = da->da_addrlen,
648 .servername = clp->cl_hostname,
649 };
650 /* Add this address as an alias */
651 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
652 rpc_clnt_test_and_add_xprt, NULL);
653 } else
654 clp = get_v3_ds_connect(mds_srv,
655 (struct sockaddr *)&da->da_addr,
656 da->da_addrlen, IPPROTO_TCP,
657 timeo, retrans);
658 }
659
660 if (IS_ERR(clp)) {
661 status = PTR_ERR(clp);
662 goto out;
663 }
664
665 smp_wmb();
666 ds->ds_clp = clp;
667 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
668out:
669 return status;
670}
671
672static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
673 struct nfs4_pnfs_ds *ds,
674 unsigned int timeo,
675 unsigned int retrans,
676 u32 minor_version)
677{
678 struct nfs_client *clp = ERR_PTR(-EIO);
679 struct nfs4_pnfs_ds_addr *da;
680 int status = 0;
681
682 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
683
684 list_for_each_entry(da, &ds->ds_addrs, da_node) {
685 dprintk("%s: DS %s: trying address %s\n",
686 __func__, ds->ds_remotestr, da->da_remotestr);
687
688 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) {
689 struct xprt_create xprt_args = {
690 .ident = XPRT_TRANSPORT_TCP,
691 .net = clp->cl_net,
692 .dstaddr = (struct sockaddr *)&da->da_addr,
693 .addrlen = da->da_addrlen,
694 .servername = clp->cl_hostname,
695 };
696 struct nfs4_add_xprt_data xprtdata = {
697 .clp = clp,
698 .cred = nfs4_get_clid_cred(clp),
699 };
700 struct rpc_add_xprt_test rpcdata = {
701 .add_xprt_test = clp->cl_mvops->session_trunk,
702 .data = &xprtdata,
703 };
704
705 /**
706 * Test this address for session trunking and
707 * add as an alias
708 */
709 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
710 rpc_clnt_setup_test_and_add_xprt,
711 &rpcdata);
712 if (xprtdata.cred)
713 put_rpccred(xprtdata.cred);
714 } else {
715 clp = nfs4_set_ds_client(mds_srv,
716 (struct sockaddr *)&da->da_addr,
717 da->da_addrlen, IPPROTO_TCP,
718 timeo, retrans, minor_version);
719 if (IS_ERR(clp))
720 continue;
721
722 status = nfs4_init_ds_session(clp,
723 mds_srv->nfs_client->cl_lease_time);
724 if (status) {
725 nfs_put_client(clp);
726 clp = ERR_PTR(-EIO);
727 continue;
728 }
729
730 }
731 }
732
733 if (IS_ERR(clp)) {
734 status = PTR_ERR(clp);
735 goto out;
736 }
737
738 smp_wmb();
739 ds->ds_clp = clp;
740 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
741out:
742 return status;
743}
744
745/*
746 * Create an rpc connection to the nfs4_pnfs_ds data server.
747 * Currently only supports IPv4 and IPv6 addresses.
748 * If connection fails, make devid unavailable.
749 */
750void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
751 struct nfs4_deviceid_node *devid, unsigned int timeo,
752 unsigned int retrans, u32 version, u32 minor_version)
753{
754 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
755 int err = 0;
756
757 if (version == 3) {
758 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo,
759 retrans);
760 } else if (version == 4) {
761 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo,
762 retrans, minor_version);
763 } else {
764 dprintk("%s: unsupported DS version %d\n", __func__,
765 version);
766 err = -EPROTONOSUPPORT;
767 }
768
769 if (err)
770 nfs4_mark_deviceid_unavailable(devid);
771 nfs4_clear_ds_conn_bit(ds);
772 } else {
773 nfs4_wait_ds_connect(ds);
774 }
775}
776EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
777
778/*
779 * Currently only supports ipv4, ipv6 and one multi-path address.
780 */
781struct nfs4_pnfs_ds_addr *
782nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags)
783{
784 struct nfs4_pnfs_ds_addr *da = NULL;
785 char *buf, *portstr;
786 __be16 port;
787 int nlen, rlen;
788 int tmp[2];
789 __be32 *p;
790 char *netid, *match_netid;
791 size_t len, match_netid_len;
792 char *startsep = "";
793 char *endsep = "";
794
795
796 /* r_netid */
797 p = xdr_inline_decode(xdr, 4);
798 if (unlikely(!p))
799 goto out_err;
800 nlen = be32_to_cpup(p++);
801
802 p = xdr_inline_decode(xdr, nlen);
803 if (unlikely(!p))
804 goto out_err;
805
806 netid = kmalloc(nlen+1, gfp_flags);
807 if (unlikely(!netid))
808 goto out_err;
809
810 netid[nlen] = '\0';
811 memcpy(netid, p, nlen);
812
813 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
814 p = xdr_inline_decode(xdr, 4);
815 if (unlikely(!p))
816 goto out_free_netid;
817 rlen = be32_to_cpup(p);
818
819 p = xdr_inline_decode(xdr, rlen);
820 if (unlikely(!p))
821 goto out_free_netid;
822
823 /* port is ".ABC.DEF", 8 chars max */
824 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) {
825 dprintk("%s: Invalid address, length %d\n", __func__,
826 rlen);
827 goto out_free_netid;
828 }
829 buf = kmalloc(rlen + 1, gfp_flags);
830 if (!buf) {
831 dprintk("%s: Not enough memory\n", __func__);
832 goto out_free_netid;
833 }
834 buf[rlen] = '\0';
835 memcpy(buf, p, rlen);
836
837 /* replace port '.' with '-' */
838 portstr = strrchr(buf, '.');
839 if (!portstr) {
840 dprintk("%s: Failed finding expected dot in port\n",
841 __func__);
842 goto out_free_buf;
843 }
844 *portstr = '-';
845
846 /* find '.' between address and port */
847 portstr = strrchr(buf, '.');
848 if (!portstr) {
849 dprintk("%s: Failed finding expected dot between address and "
850 "port\n", __func__);
851 goto out_free_buf;
852 }
853 *portstr = '\0';
854
855 da = kzalloc(sizeof(*da), gfp_flags);
856 if (unlikely(!da))
857 goto out_free_buf;
858
859 INIT_LIST_HEAD(&da->da_node);
860
861 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
862 sizeof(da->da_addr))) {
863 dprintk("%s: error parsing address %s\n", __func__, buf);
864 goto out_free_da;
865 }
866
867 portstr++;
868 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
869 port = htons((tmp[0] << 8) | (tmp[1]));
870
871 switch (da->da_addr.ss_family) {
872 case AF_INET:
873 ((struct sockaddr_in *)&da->da_addr)->sin_port = port;
874 da->da_addrlen = sizeof(struct sockaddr_in);
875 match_netid = "tcp";
876 match_netid_len = 3;
877 break;
878
879 case AF_INET6:
880 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
881 da->da_addrlen = sizeof(struct sockaddr_in6);
882 match_netid = "tcp6";
883 match_netid_len = 4;
884 startsep = "[";
885 endsep = "]";
886 break;
887
888 default:
889 dprintk("%s: unsupported address family: %u\n",
890 __func__, da->da_addr.ss_family);
891 goto out_free_da;
892 }
893
894 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) {
895 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n",
896 __func__, netid, match_netid);
897 goto out_free_da;
898 }
899
900 /* save human readable address */
901 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
902 da->da_remotestr = kzalloc(len, gfp_flags);
903
904 /* NULL is ok, only used for dprintk */
905 if (da->da_remotestr)
906 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
907 buf, endsep, ntohs(port));
908
909 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
910 kfree(buf);
911 kfree(netid);
912 return da;
913
914out_free_da:
915 kfree(da);
916out_free_buf:
917 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
918 kfree(buf);
919out_free_netid:
920 kfree(netid);
921out_err:
922 return NULL;
923}
924EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
925
926void
927pnfs_layout_mark_request_commit(struct nfs_page *req,
928 struct pnfs_layout_segment *lseg,
929 struct nfs_commit_info *cinfo,
930 u32 ds_commit_idx)
931{
932 struct list_head *list;
933 struct pnfs_commit_bucket *buckets;
934
935 spin_lock(&cinfo->inode->i_lock);
936 buckets = cinfo->ds->buckets;
937 list = &buckets[ds_commit_idx].written;
938 if (list_empty(list)) {
939 if (!pnfs_is_valid_lseg(lseg)) {
940 spin_unlock(&cinfo->inode->i_lock);
941 cinfo->completion_ops->resched_write(cinfo, req);
942 return;
943 }
944 /* Non-empty buckets hold a reference on the lseg. That ref
945 * is normally transferred to the COMMIT call and released
946 * there. It could also be released if the last req is pulled
947 * off due to a rewrite, in which case it will be done in
948 * pnfs_common_clear_request_commit
949 */
950 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL);
951 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg);
952 }
953 set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
954 cinfo->ds->nwritten++;
955
956 nfs_request_add_commit_list_locked(req, list, cinfo);
957 spin_unlock(&cinfo->inode->i_lock);
958 nfs_mark_page_unstable(req->wb_page, cinfo);
959}
960EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
961
962int
963pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
964{
965 int ret;
966
967 if (!pnfs_layoutcommit_outstanding(inode))
968 return 0;
969 ret = nfs_commit_inode(inode, FLUSH_SYNC);
970 if (ret < 0)
971 return ret;
972 if (datasync)
973 return 0;
974 return pnfs_layoutcommit_inode(inode, true);
975}
976EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
977