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spi: efm32: Convert to use GPIO descriptors
[linux/fpc-iii.git] / fs / nfs / pnfs_nfs.c
blob8b37e7f8e789f9be96612089977142365553f7b1
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Common NFS I/O operations for the pnfs file based
4 * layout drivers.
5 *
6 * Copyright (c) 2014, Primary Data, Inc. All rights reserved.
7 *
8 * Tom Haynes <loghyr@primarydata.com>
9 */
10
11 #include <linux/nfs_fs.h>
12 #include <linux/nfs_page.h>
13 #include <linux/sunrpc/addr.h>
14 #include <linux/module.h>
15
16 #include "nfs4session.h"
17 #include "internal.h"
18 #include "pnfs.h"
19
20 #define NFSDBG_FACILITY NFSDBG_PNFS
21
22 void pnfs_generic_rw_release(void *data)
23 {
24 struct nfs_pgio_header *hdr = data;
25
26 nfs_put_client(hdr->ds_clp);
27 hdr->mds_ops->rpc_release(data);
28 }
29 EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
30
31 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
32 void pnfs_generic_prepare_to_resend_writes(struct nfs_commit_data *data)
33 {
34 struct nfs_writeverf *verf = data->res.verf;
35
36 data->task.tk_status = 0;
37 memset(&verf->verifier, 0, sizeof(verf->verifier));
38 verf->committed = NFS_UNSTABLE;
39 }
40 EXPORT_SYMBOL_GPL(pnfs_generic_prepare_to_resend_writes);
41
42 void pnfs_generic_write_commit_done(struct rpc_task *task, void *data)
43 {
44 struct nfs_commit_data *wdata = data;
45
46 /* Note this may cause RPC to be resent */
47 wdata->mds_ops->rpc_call_done(task, data);
48 }
49 EXPORT_SYMBOL_GPL(pnfs_generic_write_commit_done);
50
51 void pnfs_generic_commit_release(void *calldata)
52 {
53 struct nfs_commit_data *data = calldata;
54
55 data->completion_ops->completion(data);
56 pnfs_put_lseg(data->lseg);
57 nfs_put_client(data->ds_clp);
58 nfs_commitdata_release(data);
59 }
60 EXPORT_SYMBOL_GPL(pnfs_generic_commit_release);
61
62 /* 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 nfsi->commit_mutex
65 */
66 void
67 pnfs_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 }
84 out:
85 nfs_request_remove_commit_list(req, cinfo);
86 pnfs_put_lseg(freeme);
87 }
88 EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit);
89
90 static int
91 pnfs_generic_scan_ds_commit_list(struct pnfs_commit_bucket *bucket,
92 struct nfs_commit_info *cinfo,
93 int max)
94 {
95 struct list_head *src = &bucket->written;
96 struct list_head *dst = &bucket->committing;
97 int ret;
98
99 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
100 ret = nfs_scan_commit_list(src, dst, cinfo, max);
101 if (ret) {
102 cinfo->ds->nwritten -= ret;
103 cinfo->ds->ncommitting += ret;
104 if (bucket->clseg == NULL)
105 bucket->clseg = pnfs_get_lseg(bucket->wlseg);
106 if (list_empty(src)) {
107 pnfs_put_lseg(bucket->wlseg);
108 bucket->wlseg = NULL;
109 }
110 }
111 return ret;
112 }
113
114 /* Move reqs from written to committing lists, returning count
115 * of number moved.
116 */
117 int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo,
118 int max)
119 {
120 int i, rv = 0, cnt;
121
122 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
123 for (i = 0; i < cinfo->ds->nbuckets && max != 0; i++) {
124 cnt = pnfs_generic_scan_ds_commit_list(&cinfo->ds->buckets[i],
125 cinfo, max);
126 max -= cnt;
127 rv += cnt;
128 }
129 return rv;
130 }
131 EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
132
133 /* Pull everything off the committing lists and dump into @dst. */
134 void pnfs_generic_recover_commit_reqs(struct list_head *dst,
135 struct nfs_commit_info *cinfo)
136 {
137 struct pnfs_commit_bucket *b;
138 struct pnfs_layout_segment *freeme;
139 int nwritten;
140 int i;
141
142 lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex);
143 restart:
144 for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) {
145 nwritten = nfs_scan_commit_list(&b->written, dst, cinfo, 0);
146 if (!nwritten)
147 continue;
148 cinfo->ds->nwritten -= nwritten;
149 if (list_empty(&b->written)) {
150 freeme = b->wlseg;
151 b->wlseg = NULL;
152 pnfs_put_lseg(freeme);
153 goto restart;
154 }
155 }
156 }
157 EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
158
159 static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx)
160 {
161 struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds;
162 struct pnfs_commit_bucket *bucket;
163 struct pnfs_layout_segment *freeme;
164 struct list_head *pos;
165 LIST_HEAD(pages);
166 int i;
167
168 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
169 for (i = idx; i < fl_cinfo->nbuckets; i++) {
170 bucket = &fl_cinfo->buckets[i];
171 if (list_empty(&bucket->committing))
172 continue;
173 freeme = bucket->clseg;
174 bucket->clseg = NULL;
175 list_for_each(pos, &bucket->committing)
176 cinfo->ds->ncommitting--;
177 list_splice_init(&bucket->committing, &pages);
178 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
179 nfs_retry_commit(&pages, freeme, cinfo, i);
180 pnfs_put_lseg(freeme);
181 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
182 }
183 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
184 }
185
186 static unsigned int
187 pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo,
188 struct list_head *list)
189 {
190 struct pnfs_ds_commit_info *fl_cinfo;
191 struct pnfs_commit_bucket *bucket;
192 struct nfs_commit_data *data;
193 int i;
194 unsigned int nreq = 0;
195
196 fl_cinfo = cinfo->ds;
197 bucket = fl_cinfo->buckets;
198 for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) {
199 if (list_empty(&bucket->committing))
200 continue;
201 data = nfs_commitdata_alloc(false);
202 if (!data)
203 break;
204 data->ds_commit_index = i;
205 list_add(&data->pages, list);
206 nreq++;
207 }
208
209 /* Clean up on error */
210 pnfs_generic_retry_commit(cinfo, i);
211 return nreq;
212 }
213
214 static inline
215 void pnfs_fetch_commit_bucket_list(struct list_head *pages,
216 struct nfs_commit_data *data,
217 struct nfs_commit_info *cinfo)
218 {
219 struct pnfs_commit_bucket *bucket;
220 struct list_head *pos;
221
222 bucket = &cinfo->ds->buckets[data->ds_commit_index];
223 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
224 list_for_each(pos, &bucket->committing)
225 cinfo->ds->ncommitting--;
226 list_splice_init(&bucket->committing, pages);
227 data->lseg = bucket->clseg;
228 bucket->clseg = NULL;
229 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
230
231 }
232
233 /* Helper function for pnfs_generic_commit_pagelist to catch an empty
234 * page list. This can happen when two commits race.
235 *
236 * This must be called instead of nfs_init_commit - call one or the other, but
237 * not both!
238 */
239 static bool
240 pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages,
241 struct nfs_commit_data *data,
242 struct nfs_commit_info *cinfo)
243 {
244 if (list_empty(pages)) {
245 if (atomic_dec_and_test(&cinfo->mds->rpcs_out))
246 wake_up_var(&cinfo->mds->rpcs_out);
247 /* don't call nfs_commitdata_release - it tries to put
248 * the open_context which is not acquired until nfs_init_commit
249 * which has not been called on @data */
250 WARN_ON_ONCE(data->context);
251 nfs_commit_free(data);
252 return true;
253 }
254
255 return false;
256 }
257
258 /* This follows nfs_commit_list pretty closely */
259 int
260 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
261 int how, struct nfs_commit_info *cinfo,
262 int (*initiate_commit)(struct nfs_commit_data *data,
263 int how))
264 {
265 struct nfs_commit_data *data, *tmp;
266 LIST_HEAD(list);
267 unsigned int nreq = 0;
268
269 if (!list_empty(mds_pages)) {
270 data = nfs_commitdata_alloc(true);
271 data->ds_commit_index = -1;
272 list_add(&data->pages, &list);
273 nreq++;
274 }
275
276 nreq += pnfs_generic_alloc_ds_commits(cinfo, &list);
277
278 if (nreq == 0)
279 goto out;
280
281 atomic_add(nreq, &cinfo->mds->rpcs_out);
282
283 list_for_each_entry_safe(data, tmp, &list, pages) {
284 list_del_init(&data->pages);
285 if (data->ds_commit_index < 0) {
286 /* another commit raced with us */
287 if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages,
288 data, cinfo))
289 continue;
290
291 nfs_init_commit(data, mds_pages, NULL, cinfo);
292 nfs_initiate_commit(NFS_CLIENT(inode), data,
293 NFS_PROTO(data->inode),
294 data->mds_ops, how, 0);
295 } else {
296 LIST_HEAD(pages);
297
298 pnfs_fetch_commit_bucket_list(&pages, data, cinfo);
299
300 /* another commit raced with us */
301 if (pnfs_generic_commit_cancel_empty_pagelist(&pages,
302 data, cinfo))
303 continue;
304
305 nfs_init_commit(data, &pages, data->lseg, cinfo);
306 initiate_commit(data, how);
307 }
308 }
309 out:
310 return PNFS_ATTEMPTED;
311 }
312 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist);
313
314 /*
315 * Data server cache
316 *
317 * Data servers can be mapped to different device ids.
318 * nfs4_pnfs_ds reference counting
319 * - set to 1 on allocation
320 * - incremented when a device id maps a data server already in the cache.
321 * - decremented when deviceid is removed from the cache.
322 */
323 static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
324 static LIST_HEAD(nfs4_data_server_cache);
325
326 /* Debug routines */
327 static void
328 print_ds(struct nfs4_pnfs_ds *ds)
329 {
330 if (ds == NULL) {
331 printk(KERN_WARNING "%s NULL device\n", __func__);
332 return;
333 }
334 printk(KERN_WARNING " ds %s\n"
335 " ref count %d\n"
336 " client %p\n"
337 " cl_exchange_flags %x\n",
338 ds->ds_remotestr,
339 refcount_read(&ds->ds_count), ds->ds_clp,
340 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
341 }
342
343 static bool
344 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
345 {
346 struct sockaddr_in *a, *b;
347 struct sockaddr_in6 *a6, *b6;
348
349 if (addr1->sa_family != addr2->sa_family)
350 return false;
351
352 switch (addr1->sa_family) {
353 case AF_INET:
354 a = (struct sockaddr_in *)addr1;
355 b = (struct sockaddr_in *)addr2;
356
357 if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
358 a->sin_port == b->sin_port)
359 return true;
360 break;
361
362 case AF_INET6:
363 a6 = (struct sockaddr_in6 *)addr1;
364 b6 = (struct sockaddr_in6 *)addr2;
365
366 /* LINKLOCAL addresses must have matching scope_id */
367 if (ipv6_addr_src_scope(&a6->sin6_addr) ==
368 IPV6_ADDR_SCOPE_LINKLOCAL &&
369 a6->sin6_scope_id != b6->sin6_scope_id)
370 return false;
371
372 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
373 a6->sin6_port == b6->sin6_port)
374 return true;
375 break;
376
377 default:
378 dprintk("%s: unhandled address family: %u\n",
379 __func__, addr1->sa_family);
380 return false;
381 }
382
383 return false;
384 }
385
386 /*
387 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does,
388 * declare a match.
389 */
390 static bool
391 _same_data_server_addrs_locked(const struct list_head *dsaddrs1,
392 const struct list_head *dsaddrs2)
393 {
394 struct nfs4_pnfs_ds_addr *da1, *da2;
395 struct sockaddr *sa1, *sa2;
396 bool match = false;
397
398 list_for_each_entry(da1, dsaddrs1, da_node) {
399 sa1 = (struct sockaddr *)&da1->da_addr;
400 match = false;
401 list_for_each_entry(da2, dsaddrs2, da_node) {
402 sa2 = (struct sockaddr *)&da2->da_addr;
403 match = same_sockaddr(sa1, sa2);
404 if (match)
405 break;
406 }
407 if (!match)
408 break;
409 }
410 return match;
411 }
412
413 /*
414 * Lookup DS by addresses. nfs4_ds_cache_lock is held
415 */
416 static struct nfs4_pnfs_ds *
417 _data_server_lookup_locked(const struct list_head *dsaddrs)
418 {
419 struct nfs4_pnfs_ds *ds;
420
421 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
422 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
423 return ds;
424 return NULL;
425 }
426
427 static void destroy_ds(struct nfs4_pnfs_ds *ds)
428 {
429 struct nfs4_pnfs_ds_addr *da;
430
431 dprintk("--> %s\n", __func__);
432 ifdebug(FACILITY)
433 print_ds(ds);
434
435 nfs_put_client(ds->ds_clp);
436
437 while (!list_empty(&ds->ds_addrs)) {
438 da = list_first_entry(&ds->ds_addrs,
439 struct nfs4_pnfs_ds_addr,
440 da_node);
441 list_del_init(&da->da_node);
442 kfree(da->da_remotestr);
443 kfree(da);
444 }
445
446 kfree(ds->ds_remotestr);
447 kfree(ds);
448 }
449
450 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds)
451 {
452 if (refcount_dec_and_lock(&ds->ds_count,
453 &nfs4_ds_cache_lock)) {
454 list_del_init(&ds->ds_node);
455 spin_unlock(&nfs4_ds_cache_lock);
456 destroy_ds(ds);
457 }
458 }
459 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put);
460
461 /*
462 * Create a string with a human readable address and port to avoid
463 * complicated setup around many dprinks.
464 */
465 static char *
466 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
467 {
468 struct nfs4_pnfs_ds_addr *da;
469 char *remotestr;
470 size_t len;
471 char *p;
472
473 len = 3; /* '{', '}' and eol */
474 list_for_each_entry(da, dsaddrs, da_node) {
475 len += strlen(da->da_remotestr) + 1; /* string plus comma */
476 }
477
478 remotestr = kzalloc(len, gfp_flags);
479 if (!remotestr)
480 return NULL;
481
482 p = remotestr;
483 *(p++) = '{';
484 len--;
485 list_for_each_entry(da, dsaddrs, da_node) {
486 size_t ll = strlen(da->da_remotestr);
487
488 if (ll > len)
489 goto out_err;
490
491 memcpy(p, da->da_remotestr, ll);
492 p += ll;
493 len -= ll;
494
495 if (len < 1)
496 goto out_err;
497 (*p++) = ',';
498 len--;
499 }
500 if (len < 2)
501 goto out_err;
502 *(p++) = '}';
503 *p = '\0';
504 return remotestr;
505 out_err:
506 kfree(remotestr);
507 return NULL;
508 }
509
510 /*
511 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if
512 * uncached and return cached struct nfs4_pnfs_ds.
513 */
514 struct nfs4_pnfs_ds *
515 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
516 {
517 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
518 char *remotestr;
519
520 if (list_empty(dsaddrs)) {
521 dprintk("%s: no addresses defined\n", __func__);
522 goto out;
523 }
524
525 ds = kzalloc(sizeof(*ds), gfp_flags);
526 if (!ds)
527 goto out;
528
529 /* this is only used for debugging, so it's ok if its NULL */
530 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
531
532 spin_lock(&nfs4_ds_cache_lock);
533 tmp_ds = _data_server_lookup_locked(dsaddrs);
534 if (tmp_ds == NULL) {
535 INIT_LIST_HEAD(&ds->ds_addrs);
536 list_splice_init(dsaddrs, &ds->ds_addrs);
537 ds->ds_remotestr = remotestr;
538 refcount_set(&ds->ds_count, 1);
539 INIT_LIST_HEAD(&ds->ds_node);
540 ds->ds_clp = NULL;
541 list_add(&ds->ds_node, &nfs4_data_server_cache);
542 dprintk("%s add new data server %s\n", __func__,
543 ds->ds_remotestr);
544 } else {
545 kfree(remotestr);
546 kfree(ds);
547 refcount_inc(&tmp_ds->ds_count);
548 dprintk("%s data server %s found, inc'ed ds_count to %d\n",
549 __func__, tmp_ds->ds_remotestr,
550 refcount_read(&tmp_ds->ds_count));
551 ds = tmp_ds;
552 }
553 spin_unlock(&nfs4_ds_cache_lock);
554 out:
555 return ds;
556 }
557 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
558
559 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
560 {
561 might_sleep();
562 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING,
563 TASK_KILLABLE);
564 }
565
566 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
567 {
568 smp_mb__before_atomic();
569 clear_bit(NFS4DS_CONNECTING, &ds->ds_state);
570 smp_mb__after_atomic();
571 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING);
572 }
573
574 static struct nfs_client *(*get_v3_ds_connect)(
575 struct nfs_server *mds_srv,
576 const struct sockaddr *ds_addr,
577 int ds_addrlen,
578 int ds_proto,
579 unsigned int ds_timeo,
580 unsigned int ds_retrans);
581
582 static bool load_v3_ds_connect(void)
583 {
584 if (!get_v3_ds_connect) {
585 get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
586 WARN_ON_ONCE(!get_v3_ds_connect);
587 }
588
589 return(get_v3_ds_connect != NULL);
590 }
591
592 void nfs4_pnfs_v3_ds_connect_unload(void)
593 {
594 if (get_v3_ds_connect) {
595 symbol_put(nfs3_set_ds_client);
596 get_v3_ds_connect = NULL;
597 }
598 }
599
600 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
601 struct nfs4_pnfs_ds *ds,
602 unsigned int timeo,
603 unsigned int retrans)
604 {
605 struct nfs_client *clp = ERR_PTR(-EIO);
606 struct nfs4_pnfs_ds_addr *da;
607 int status = 0;
608
609 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
610
611 if (!load_v3_ds_connect())
612 goto out;
613
614 list_for_each_entry(da, &ds->ds_addrs, da_node) {
615 dprintk("%s: DS %s: trying address %s\n",
616 __func__, ds->ds_remotestr, da->da_remotestr);
617
618 if (!IS_ERR(clp)) {
619 struct xprt_create xprt_args = {
620 .ident = XPRT_TRANSPORT_TCP,
621 .net = clp->cl_net,
622 .dstaddr = (struct sockaddr *)&da->da_addr,
623 .addrlen = da->da_addrlen,
624 .servername = clp->cl_hostname,
625 };
626 /* Add this address as an alias */
627 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
628 rpc_clnt_test_and_add_xprt, NULL);
629 continue;
630 }
631 clp = get_v3_ds_connect(mds_srv,
632 (struct sockaddr *)&da->da_addr,
633 da->da_addrlen, IPPROTO_TCP,
634 timeo, retrans);
635 if (IS_ERR(clp))
636 continue;
637 clp->cl_rpcclient->cl_softerr = 0;
638 clp->cl_rpcclient->cl_softrtry = 0;
639 }
640
641 if (IS_ERR(clp)) {
642 status = PTR_ERR(clp);
643 goto out;
644 }
645
646 smp_wmb();
647 ds->ds_clp = clp;
648 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
649 out:
650 return status;
651 }
652
653 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
654 struct nfs4_pnfs_ds *ds,
655 unsigned int timeo,
656 unsigned int retrans,
657 u32 minor_version)
658 {
659 struct nfs_client *clp = ERR_PTR(-EIO);
660 struct nfs4_pnfs_ds_addr *da;
661 int status = 0;
662
663 dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
664
665 list_for_each_entry(da, &ds->ds_addrs, da_node) {
666 dprintk("%s: DS %s: trying address %s\n",
667 __func__, ds->ds_remotestr, da->da_remotestr);
668
669 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) {
670 struct xprt_create xprt_args = {
671 .ident = XPRT_TRANSPORT_TCP,
672 .net = clp->cl_net,
673 .dstaddr = (struct sockaddr *)&da->da_addr,
674 .addrlen = da->da_addrlen,
675 .servername = clp->cl_hostname,
676 };
677 struct nfs4_add_xprt_data xprtdata = {
678 .clp = clp,
679 .cred = nfs4_get_clid_cred(clp),
680 };
681 struct rpc_add_xprt_test rpcdata = {
682 .add_xprt_test = clp->cl_mvops->session_trunk,
683 .data = &xprtdata,
684 };
685
686 /**
687 * Test this address for session trunking and
688 * add as an alias
689 */
690 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
691 rpc_clnt_setup_test_and_add_xprt,
692 &rpcdata);
693 if (xprtdata.cred)
694 put_cred(xprtdata.cred);
695 } else {
696 clp = nfs4_set_ds_client(mds_srv,
697 (struct sockaddr *)&da->da_addr,
698 da->da_addrlen, IPPROTO_TCP,
699 timeo, retrans, minor_version);
700 if (IS_ERR(clp))
701 continue;
702
703 status = nfs4_init_ds_session(clp,
704 mds_srv->nfs_client->cl_lease_time);
705 if (status) {
706 nfs_put_client(clp);
707 clp = ERR_PTR(-EIO);
708 continue;
709 }
710
711 }
712 }
713
714 if (IS_ERR(clp)) {
715 status = PTR_ERR(clp);
716 goto out;
717 }
718
719 smp_wmb();
720 ds->ds_clp = clp;
721 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
722 out:
723 return status;
724 }
725
726 /*
727 * Create an rpc connection to the nfs4_pnfs_ds data server.
728 * Currently only supports IPv4 and IPv6 addresses.
729 * If connection fails, make devid unavailable and return a -errno.
730 */
731 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
732 struct nfs4_deviceid_node *devid, unsigned int timeo,
733 unsigned int retrans, u32 version, u32 minor_version)
734 {
735 int err;
736
737 again:
738 err = 0;
739 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
740 if (version == 3) {
741 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo,
742 retrans);
743 } else if (version == 4) {
744 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo,
745 retrans, minor_version);
746 } else {
747 dprintk("%s: unsupported DS version %d\n", __func__,
748 version);
749 err = -EPROTONOSUPPORT;
750 }
751
752 nfs4_clear_ds_conn_bit(ds);
753 } else {
754 nfs4_wait_ds_connect(ds);
755
756 /* what was waited on didn't connect AND didn't mark unavail */
757 if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid))
758 goto again;
759 }
760
761 /*
762 * At this point the ds->ds_clp should be ready, but it might have
763 * hit an error.
764 */
765 if (!err) {
766 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) {
767 WARN_ON_ONCE(ds->ds_clp ||
768 !nfs4_test_deviceid_unavailable(devid));
769 return -EINVAL;
770 }
771 err = nfs_client_init_status(ds->ds_clp);
772 }
773
774 return err;
775 }
776 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
777
778 /*
779 * Currently only supports ipv4, ipv6 and one multi-path address.
780 */
781 struct nfs4_pnfs_ds_addr *
782 nfs4_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
914 out_free_da:
915 kfree(da);
916 out_free_buf:
917 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
918 kfree(buf);
919 out_free_netid:
920 kfree(netid);
921 out_err:
922 return NULL;
923 }
924 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
925
926 void
927 pnfs_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 mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
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 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
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 mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
958 nfs_mark_page_unstable(req->wb_page, cinfo);
959 }
960 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
961
962 int
963 pnfs_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 }
976 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
977
Linux with added FPC-III support