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powerpc/kprobes: Remove kretprobe_trampoline_holder.
[linux/fpc-iii.git] / fs / nfs / pnfs_nfs.c
blob0dfc476da3e10918bcf0242d779cda343e6dac61
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
21 void 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 }
28 EXPORT_SYMBOL_GPL(pnfs_generic_rw_release);
29
30 /* Fake up some data that will cause nfs_commit_release to retry the writes. */
31 void 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 }
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 i_lock
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_locked(freeme);
87 }
88 EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit);
89
90 static int
91 pnfs_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
113 static int
114 pnfs_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 */
140 int 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 }
154 EXPORT_SYMBOL_GPL(pnfs_generic_scan_commit_lists);
155
156 /* Pull everything off the committing lists and dump into @dst. */
157 void 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);
165 restart:
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 }
179 EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs);
180
181 static 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
205 static unsigned int
206 pnfs_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
233 static inline
234 void 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 static bool
252 pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages,
253 struct nfs_commit_data *data,
254 struct nfs_commit_info *cinfo)
255 {
256 if (list_empty(pages)) {
257 if (atomic_dec_and_test(&cinfo->mds->rpcs_out))
258 wake_up_atomic_t(&cinfo->mds->rpcs_out);
259 nfs_commitdata_release(data);
260 return true;
261 }
262
263 return false;
264 }
265
266 /* This follows nfs_commit_list pretty closely */
267 int
268 pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages,
269 int how, struct nfs_commit_info *cinfo,
270 int (*initiate_commit)(struct nfs_commit_data *data,
271 int how))
272 {
273 struct nfs_commit_data *data, *tmp;
274 LIST_HEAD(list);
275 unsigned int nreq = 0;
276
277 if (!list_empty(mds_pages)) {
278 data = nfs_commitdata_alloc();
279 if (data != NULL) {
280 data->ds_commit_index = -1;
281 list_add(&data->pages, &list);
282 nreq++;
283 } else {
284 nfs_retry_commit(mds_pages, NULL, cinfo, 0);
285 pnfs_generic_retry_commit(cinfo, 0);
286 return -ENOMEM;
287 }
288 }
289
290 nreq += pnfs_generic_alloc_ds_commits(cinfo, &list);
291
292 if (nreq == 0)
293 goto out;
294
295 atomic_add(nreq, &cinfo->mds->rpcs_out);
296
297 list_for_each_entry_safe(data, tmp, &list, pages) {
298 list_del_init(&data->pages);
299 if (data->ds_commit_index < 0) {
300 /* another commit raced with us */
301 if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages,
302 data, cinfo))
303 continue;
304
305 nfs_init_commit(data, mds_pages, NULL, cinfo);
306 nfs_initiate_commit(NFS_CLIENT(inode), data,
307 NFS_PROTO(data->inode),
308 data->mds_ops, how, 0);
309 } else {
310 LIST_HEAD(pages);
311
312 pnfs_fetch_commit_bucket_list(&pages, data, cinfo);
313
314 /* another commit raced with us */
315 if (pnfs_generic_commit_cancel_empty_pagelist(&pages,
316 data, cinfo))
317 continue;
318
319 nfs_init_commit(data, &pages, data->lseg, cinfo);
320 initiate_commit(data, how);
321 }
322 }
323 out:
324 cinfo->ds->ncommitting = 0;
325 return PNFS_ATTEMPTED;
326 }
327 EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist);
328
329 /*
330 * Data server cache
331 *
332 * Data servers can be mapped to different device ids.
333 * nfs4_pnfs_ds reference counting
334 * - set to 1 on allocation
335 * - incremented when a device id maps a data server already in the cache.
336 * - decremented when deviceid is removed from the cache.
337 */
338 static DEFINE_SPINLOCK(nfs4_ds_cache_lock);
339 static LIST_HEAD(nfs4_data_server_cache);
340
341 /* Debug routines */
342 static void
343 print_ds(struct nfs4_pnfs_ds *ds)
344 {
345 if (ds == NULL) {
346 printk(KERN_WARNING "%s NULL device\n", __func__);
347 return;
348 }
349 printk(KERN_WARNING " ds %s\n"
350 " ref count %d\n"
351 " client %p\n"
352 " cl_exchange_flags %x\n",
353 ds->ds_remotestr,
354 atomic_read(&ds->ds_count), ds->ds_clp,
355 ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0);
356 }
357
358 static bool
359 same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2)
360 {
361 struct sockaddr_in *a, *b;
362 struct sockaddr_in6 *a6, *b6;
363
364 if (addr1->sa_family != addr2->sa_family)
365 return false;
366
367 switch (addr1->sa_family) {
368 case AF_INET:
369 a = (struct sockaddr_in *)addr1;
370 b = (struct sockaddr_in *)addr2;
371
372 if (a->sin_addr.s_addr == b->sin_addr.s_addr &&
373 a->sin_port == b->sin_port)
374 return true;
375 break;
376
377 case AF_INET6:
378 a6 = (struct sockaddr_in6 *)addr1;
379 b6 = (struct sockaddr_in6 *)addr2;
380
381 /* LINKLOCAL addresses must have matching scope_id */
382 if (ipv6_addr_src_scope(&a6->sin6_addr) ==
383 IPV6_ADDR_SCOPE_LINKLOCAL &&
384 a6->sin6_scope_id != b6->sin6_scope_id)
385 return false;
386
387 if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) &&
388 a6->sin6_port == b6->sin6_port)
389 return true;
390 break;
391
392 default:
393 dprintk("%s: unhandled address family: %u\n",
394 __func__, addr1->sa_family);
395 return false;
396 }
397
398 return false;
399 }
400
401 /*
402 * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does,
403 * declare a match.
404 */
405 static bool
406 _same_data_server_addrs_locked(const struct list_head *dsaddrs1,
407 const struct list_head *dsaddrs2)
408 {
409 struct nfs4_pnfs_ds_addr *da1, *da2;
410 struct sockaddr *sa1, *sa2;
411 bool match = false;
412
413 list_for_each_entry(da1, dsaddrs1, da_node) {
414 sa1 = (struct sockaddr *)&da1->da_addr;
415 match = false;
416 list_for_each_entry(da2, dsaddrs2, da_node) {
417 sa2 = (struct sockaddr *)&da2->da_addr;
418 match = same_sockaddr(sa1, sa2);
419 if (match)
420 break;
421 }
422 if (!match)
423 break;
424 }
425 return match;
426 }
427
428 /*
429 * Lookup DS by addresses. nfs4_ds_cache_lock is held
430 */
431 static struct nfs4_pnfs_ds *
432 _data_server_lookup_locked(const struct list_head *dsaddrs)
433 {
434 struct nfs4_pnfs_ds *ds;
435
436 list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
437 if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs))
438 return ds;
439 return NULL;
440 }
441
442 static void destroy_ds(struct nfs4_pnfs_ds *ds)
443 {
444 struct nfs4_pnfs_ds_addr *da;
445
446 dprintk("--> %s\n", __func__);
447 ifdebug(FACILITY)
448 print_ds(ds);
449
450 nfs_put_client(ds->ds_clp);
451
452 while (!list_empty(&ds->ds_addrs)) {
453 da = list_first_entry(&ds->ds_addrs,
454 struct nfs4_pnfs_ds_addr,
455 da_node);
456 list_del_init(&da->da_node);
457 kfree(da->da_remotestr);
458 kfree(da);
459 }
460
461 kfree(ds->ds_remotestr);
462 kfree(ds);
463 }
464
465 void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds)
466 {
467 if (atomic_dec_and_lock(&ds->ds_count,
468 &nfs4_ds_cache_lock)) {
469 list_del_init(&ds->ds_node);
470 spin_unlock(&nfs4_ds_cache_lock);
471 destroy_ds(ds);
472 }
473 }
474 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put);
475
476 /*
477 * Create a string with a human readable address and port to avoid
478 * complicated setup around many dprinks.
479 */
480 static char *
481 nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags)
482 {
483 struct nfs4_pnfs_ds_addr *da;
484 char *remotestr;
485 size_t len;
486 char *p;
487
488 len = 3; /* '{', '}' and eol */
489 list_for_each_entry(da, dsaddrs, da_node) {
490 len += strlen(da->da_remotestr) + 1; /* string plus comma */
491 }
492
493 remotestr = kzalloc(len, gfp_flags);
494 if (!remotestr)
495 return NULL;
496
497 p = remotestr;
498 *(p++) = '{';
499 len--;
500 list_for_each_entry(da, dsaddrs, da_node) {
501 size_t ll = strlen(da->da_remotestr);
502
503 if (ll > len)
504 goto out_err;
505
506 memcpy(p, da->da_remotestr, ll);
507 p += ll;
508 len -= ll;
509
510 if (len < 1)
511 goto out_err;
512 (*p++) = ',';
513 len--;
514 }
515 if (len < 2)
516 goto out_err;
517 *(p++) = '}';
518 *p = '\0';
519 return remotestr;
520 out_err:
521 kfree(remotestr);
522 return NULL;
523 }
524
525 /*
526 * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if
527 * uncached and return cached struct nfs4_pnfs_ds.
528 */
529 struct nfs4_pnfs_ds *
530 nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags)
531 {
532 struct nfs4_pnfs_ds *tmp_ds, *ds = NULL;
533 char *remotestr;
534
535 if (list_empty(dsaddrs)) {
536 dprintk("%s: no addresses defined\n", __func__);
537 goto out;
538 }
539
540 ds = kzalloc(sizeof(*ds), gfp_flags);
541 if (!ds)
542 goto out;
543
544 /* this is only used for debugging, so it's ok if its NULL */
545 remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags);
546
547 spin_lock(&nfs4_ds_cache_lock);
548 tmp_ds = _data_server_lookup_locked(dsaddrs);
549 if (tmp_ds == NULL) {
550 INIT_LIST_HEAD(&ds->ds_addrs);
551 list_splice_init(dsaddrs, &ds->ds_addrs);
552 ds->ds_remotestr = remotestr;
553 atomic_set(&ds->ds_count, 1);
554 INIT_LIST_HEAD(&ds->ds_node);
555 ds->ds_clp = NULL;
556 list_add(&ds->ds_node, &nfs4_data_server_cache);
557 dprintk("%s add new data server %s\n", __func__,
558 ds->ds_remotestr);
559 } else {
560 kfree(remotestr);
561 kfree(ds);
562 atomic_inc(&tmp_ds->ds_count);
563 dprintk("%s data server %s found, inc'ed ds_count to %d\n",
564 __func__, tmp_ds->ds_remotestr,
565 atomic_read(&tmp_ds->ds_count));
566 ds = tmp_ds;
567 }
568 spin_unlock(&nfs4_ds_cache_lock);
569 out:
570 return ds;
571 }
572 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add);
573
574 static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds)
575 {
576 might_sleep();
577 wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING,
578 TASK_KILLABLE);
579 }
580
581 static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds)
582 {
583 smp_mb__before_atomic();
584 clear_bit(NFS4DS_CONNECTING, &ds->ds_state);
585 smp_mb__after_atomic();
586 wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING);
587 }
588
589 static struct nfs_client *(*get_v3_ds_connect)(
590 struct nfs_client *mds_clp,
591 const struct sockaddr *ds_addr,
592 int ds_addrlen,
593 int ds_proto,
594 unsigned int ds_timeo,
595 unsigned int ds_retrans,
596 rpc_authflavor_t au_flavor);
597
598 static bool load_v3_ds_connect(void)
599 {
600 if (!get_v3_ds_connect) {
601 get_v3_ds_connect = symbol_request(nfs3_set_ds_client);
602 WARN_ON_ONCE(!get_v3_ds_connect);
603 }
604
605 return(get_v3_ds_connect != NULL);
606 }
607
608 void nfs4_pnfs_v3_ds_connect_unload(void)
609 {
610 if (get_v3_ds_connect) {
611 symbol_put(nfs3_set_ds_client);
612 get_v3_ds_connect = NULL;
613 }
614 }
615 EXPORT_SYMBOL_GPL(nfs4_pnfs_v3_ds_connect_unload);
616
617 static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv,
618 struct nfs4_pnfs_ds *ds,
619 unsigned int timeo,
620 unsigned int retrans,
621 rpc_authflavor_t au_flavor)
622 {
623 struct nfs_client *clp = ERR_PTR(-EIO);
624 struct nfs4_pnfs_ds_addr *da;
625 int status = 0;
626
627 dprintk("--> %s DS %s au_flavor %d\n", __func__,
628 ds->ds_remotestr, au_flavor);
629
630 if (!load_v3_ds_connect())
631 goto out;
632
633 list_for_each_entry(da, &ds->ds_addrs, da_node) {
634 dprintk("%s: DS %s: trying address %s\n",
635 __func__, ds->ds_remotestr, da->da_remotestr);
636
637 if (!IS_ERR(clp)) {
638 struct xprt_create xprt_args = {
639 .ident = XPRT_TRANSPORT_TCP,
640 .net = clp->cl_net,
641 .dstaddr = (struct sockaddr *)&da->da_addr,
642 .addrlen = da->da_addrlen,
643 .servername = clp->cl_hostname,
644 };
645 /* Add this address as an alias */
646 rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
647 rpc_clnt_test_and_add_xprt, NULL);
648 } else
649 clp = get_v3_ds_connect(mds_srv->nfs_client,
650 (struct sockaddr *)&da->da_addr,
651 da->da_addrlen, IPPROTO_TCP,
652 timeo, retrans, au_flavor);
653 }
654
655 if (IS_ERR(clp)) {
656 status = PTR_ERR(clp);
657 goto out;
658 }
659
660 smp_wmb();
661 ds->ds_clp = clp;
662 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
663 out:
664 return status;
665 }
666
667 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
668 struct nfs4_pnfs_ds *ds,
669 unsigned int timeo,
670 unsigned int retrans,
671 u32 minor_version,
672 rpc_authflavor_t au_flavor)
673 {
674 struct nfs_client *clp = ERR_PTR(-EIO);
675 struct nfs4_pnfs_ds_addr *da;
676 int status = 0;
677
678 dprintk("--> %s DS %s au_flavor %d\n", __func__, ds->ds_remotestr,
679 au_flavor);
680
681 list_for_each_entry(da, &ds->ds_addrs, da_node) {
682 dprintk("%s: DS %s: trying address %s\n",
683 __func__, ds->ds_remotestr, da->da_remotestr);
684
685 clp = nfs4_set_ds_client(mds_srv->nfs_client,
686 (struct sockaddr *)&da->da_addr,
687 da->da_addrlen, IPPROTO_TCP,
688 timeo, retrans, minor_version,
689 au_flavor);
690 if (!IS_ERR(clp))
691 break;
692 }
693
694 if (IS_ERR(clp)) {
695 status = PTR_ERR(clp);
696 goto out;
697 }
698
699 status = nfs4_init_ds_session(clp, mds_srv->nfs_client->cl_lease_time);
700 if (status)
701 goto out_put;
702
703 smp_wmb();
704 ds->ds_clp = clp;
705 dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
706 out:
707 return status;
708 out_put:
709 nfs_put_client(clp);
710 goto out;
711 }
712
713 /*
714 * Create an rpc connection to the nfs4_pnfs_ds data server.
715 * Currently only supports IPv4 and IPv6 addresses.
716 * If connection fails, make devid unavailable.
717 */
718 void nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
719 struct nfs4_deviceid_node *devid, unsigned int timeo,
720 unsigned int retrans, u32 version,
721 u32 minor_version, rpc_authflavor_t au_flavor)
722 {
723 if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
724 int err = 0;
725
726 if (version == 3) {
727 err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo,
728 retrans, au_flavor);
729 } else if (version == 4) {
730 err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo,
731 retrans, minor_version,
732 au_flavor);
733 } else {
734 dprintk("%s: unsupported DS version %d\n", __func__,
735 version);
736 err = -EPROTONOSUPPORT;
737 }
738
739 if (err)
740 nfs4_mark_deviceid_unavailable(devid);
741 nfs4_clear_ds_conn_bit(ds);
742 } else {
743 nfs4_wait_ds_connect(ds);
744 }
745 }
746 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
747
748 /*
749 * Currently only supports ipv4, ipv6 and one multi-path address.
750 */
751 struct nfs4_pnfs_ds_addr *
752 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags)
753 {
754 struct nfs4_pnfs_ds_addr *da = NULL;
755 char *buf, *portstr;
756 __be16 port;
757 int nlen, rlen;
758 int tmp[2];
759 __be32 *p;
760 char *netid, *match_netid;
761 size_t len, match_netid_len;
762 char *startsep = "";
763 char *endsep = "";
764
765
766 /* r_netid */
767 p = xdr_inline_decode(xdr, 4);
768 if (unlikely(!p))
769 goto out_err;
770 nlen = be32_to_cpup(p++);
771
772 p = xdr_inline_decode(xdr, nlen);
773 if (unlikely(!p))
774 goto out_err;
775
776 netid = kmalloc(nlen+1, gfp_flags);
777 if (unlikely(!netid))
778 goto out_err;
779
780 netid[nlen] = '\0';
781 memcpy(netid, p, nlen);
782
783 /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
784 p = xdr_inline_decode(xdr, 4);
785 if (unlikely(!p))
786 goto out_free_netid;
787 rlen = be32_to_cpup(p);
788
789 p = xdr_inline_decode(xdr, rlen);
790 if (unlikely(!p))
791 goto out_free_netid;
792
793 /* port is ".ABC.DEF", 8 chars max */
794 if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) {
795 dprintk("%s: Invalid address, length %d\n", __func__,
796 rlen);
797 goto out_free_netid;
798 }
799 buf = kmalloc(rlen + 1, gfp_flags);
800 if (!buf) {
801 dprintk("%s: Not enough memory\n", __func__);
802 goto out_free_netid;
803 }
804 buf[rlen] = '\0';
805 memcpy(buf, p, rlen);
806
807 /* replace port '.' with '-' */
808 portstr = strrchr(buf, '.');
809 if (!portstr) {
810 dprintk("%s: Failed finding expected dot in port\n",
811 __func__);
812 goto out_free_buf;
813 }
814 *portstr = '-';
815
816 /* find '.' between address and port */
817 portstr = strrchr(buf, '.');
818 if (!portstr) {
819 dprintk("%s: Failed finding expected dot between address and "
820 "port\n", __func__);
821 goto out_free_buf;
822 }
823 *portstr = '\0';
824
825 da = kzalloc(sizeof(*da), gfp_flags);
826 if (unlikely(!da))
827 goto out_free_buf;
828
829 INIT_LIST_HEAD(&da->da_node);
830
831 if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
832 sizeof(da->da_addr))) {
833 dprintk("%s: error parsing address %s\n", __func__, buf);
834 goto out_free_da;
835 }
836
837 portstr++;
838 sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
839 port = htons((tmp[0] << 8) | (tmp[1]));
840
841 switch (da->da_addr.ss_family) {
842 case AF_INET:
843 ((struct sockaddr_in *)&da->da_addr)->sin_port = port;
844 da->da_addrlen = sizeof(struct sockaddr_in);
845 match_netid = "tcp";
846 match_netid_len = 3;
847 break;
848
849 case AF_INET6:
850 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
851 da->da_addrlen = sizeof(struct sockaddr_in6);
852 match_netid = "tcp6";
853 match_netid_len = 4;
854 startsep = "[";
855 endsep = "]";
856 break;
857
858 default:
859 dprintk("%s: unsupported address family: %u\n",
860 __func__, da->da_addr.ss_family);
861 goto out_free_da;
862 }
863
864 if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) {
865 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n",
866 __func__, netid, match_netid);
867 goto out_free_da;
868 }
869
870 /* save human readable address */
871 len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
872 da->da_remotestr = kzalloc(len, gfp_flags);
873
874 /* NULL is ok, only used for dprintk */
875 if (da->da_remotestr)
876 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
877 buf, endsep, ntohs(port));
878
879 dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
880 kfree(buf);
881 kfree(netid);
882 return da;
883
884 out_free_da:
885 kfree(da);
886 out_free_buf:
887 dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
888 kfree(buf);
889 out_free_netid:
890 kfree(netid);
891 out_err:
892 return NULL;
893 }
894 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
895
896 void
897 pnfs_layout_mark_request_commit(struct nfs_page *req,
898 struct pnfs_layout_segment *lseg,
899 struct nfs_commit_info *cinfo,
900 u32 ds_commit_idx)
901 {
902 struct list_head *list;
903 struct pnfs_commit_bucket *buckets;
904
905 spin_lock(&cinfo->inode->i_lock);
906 buckets = cinfo->ds->buckets;
907 list = &buckets[ds_commit_idx].written;
908 if (list_empty(list)) {
909 if (!pnfs_is_valid_lseg(lseg)) {
910 spin_unlock(&cinfo->inode->i_lock);
911 cinfo->completion_ops->resched_write(cinfo, req);
912 return;
913 }
914 /* Non-empty buckets hold a reference on the lseg. That ref
915 * is normally transferred to the COMMIT call and released
916 * there. It could also be released if the last req is pulled
917 * off due to a rewrite, in which case it will be done in
918 * pnfs_common_clear_request_commit
919 */
920 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL);
921 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg);
922 }
923 set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
924 cinfo->ds->nwritten++;
925
926 nfs_request_add_commit_list_locked(req, list, cinfo);
927 spin_unlock(&cinfo->inode->i_lock);
928 nfs_mark_page_unstable(req->wb_page, cinfo);
929 }
930 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
931
932 int
933 pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
934 {
935 if (datasync)
936 return 0;
937 return pnfs_layoutcommit_inode(inode, true);
938 }
939 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
940
Linux with added FPC-III support