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TOMOYO Linux Cross Reference
Linux/fs/nfs/pnfs_nfs.c

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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 
 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 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                 } else
630                         clp = get_v3_ds_connect(mds_srv,
631                                         (struct sockaddr *)&da->da_addr,
632                                         da->da_addrlen, IPPROTO_TCP,
633                                         timeo, retrans);
634         }
635 
636         if (IS_ERR(clp)) {
637                 status = PTR_ERR(clp);
638                 goto out;
639         }
640 
641         smp_wmb();
642         ds->ds_clp = clp;
643         dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
644 out:
645         return status;
646 }
647 
648 static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv,
649                                  struct nfs4_pnfs_ds *ds,
650                                  unsigned int timeo,
651                                  unsigned int retrans,
652                                  u32 minor_version)
653 {
654         struct nfs_client *clp = ERR_PTR(-EIO);
655         struct nfs4_pnfs_ds_addr *da;
656         int status = 0;
657 
658         dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr);
659 
660         list_for_each_entry(da, &ds->ds_addrs, da_node) {
661                 dprintk("%s: DS %s: trying address %s\n",
662                         __func__, ds->ds_remotestr, da->da_remotestr);
663 
664                 if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) {
665                         struct xprt_create xprt_args = {
666                                 .ident = XPRT_TRANSPORT_TCP,
667                                 .net = clp->cl_net,
668                                 .dstaddr = (struct sockaddr *)&da->da_addr,
669                                 .addrlen = da->da_addrlen,
670                                 .servername = clp->cl_hostname,
671                         };
672                         struct nfs4_add_xprt_data xprtdata = {
673                                 .clp = clp,
674                                 .cred = nfs4_get_clid_cred(clp),
675                         };
676                         struct rpc_add_xprt_test rpcdata = {
677                                 .add_xprt_test = clp->cl_mvops->session_trunk,
678                                 .data = &xprtdata,
679                         };
680 
681                         /**
682                         * Test this address for session trunking and
683                         * add as an alias
684                         */
685                         rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
686                                           rpc_clnt_setup_test_and_add_xprt,
687                                           &rpcdata);
688                         if (xprtdata.cred)
689                                 put_cred(xprtdata.cred);
690                 } else {
691                         clp = nfs4_set_ds_client(mds_srv,
692                                                 (struct sockaddr *)&da->da_addr,
693                                                 da->da_addrlen, IPPROTO_TCP,
694                                                 timeo, retrans, minor_version);
695                         if (IS_ERR(clp))
696                                 continue;
697 
698                         status = nfs4_init_ds_session(clp,
699                                         mds_srv->nfs_client->cl_lease_time);
700                         if (status) {
701                                 nfs_put_client(clp);
702                                 clp = ERR_PTR(-EIO);
703                                 continue;
704                         }
705 
706                 }
707         }
708 
709         if (IS_ERR(clp)) {
710                 status = PTR_ERR(clp);
711                 goto out;
712         }
713 
714         smp_wmb();
715         ds->ds_clp = clp;
716         dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
717 out:
718         return status;
719 }
720 
721 /*
722  * Create an rpc connection to the nfs4_pnfs_ds data server.
723  * Currently only supports IPv4 and IPv6 addresses.
724  * If connection fails, make devid unavailable and return a -errno.
725  */
726 int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds,
727                           struct nfs4_deviceid_node *devid, unsigned int timeo,
728                           unsigned int retrans, u32 version, u32 minor_version)
729 {
730         int err;
731 
732 again:
733         err = 0;
734         if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) {
735                 if (version == 3) {
736                         err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo,
737                                                        retrans);
738                 } else if (version == 4) {
739                         err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo,
740                                                        retrans, minor_version);
741                 } else {
742                         dprintk("%s: unsupported DS version %d\n", __func__,
743                                 version);
744                         err = -EPROTONOSUPPORT;
745                 }
746 
747                 nfs4_clear_ds_conn_bit(ds);
748         } else {
749                 nfs4_wait_ds_connect(ds);
750 
751                 /* what was waited on didn't connect AND didn't mark unavail */
752                 if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid))
753                         goto again;
754         }
755 
756         /*
757          * At this point the ds->ds_clp should be ready, but it might have
758          * hit an error.
759          */
760         if (!err) {
761                 if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) {
762                         WARN_ON_ONCE(ds->ds_clp ||
763                                 !nfs4_test_deviceid_unavailable(devid));
764                         return -EINVAL;
765                 }
766                 err = nfs_client_init_status(ds->ds_clp);
767         }
768 
769         return err;
770 }
771 EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect);
772 
773 /*
774  * Currently only supports ipv4, ipv6 and one multi-path address.
775  */
776 struct nfs4_pnfs_ds_addr *
777 nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags)
778 {
779         struct nfs4_pnfs_ds_addr *da = NULL;
780         char *buf, *portstr;
781         __be16 port;
782         int nlen, rlen;
783         int tmp[2];
784         __be32 *p;
785         char *netid, *match_netid;
786         size_t len, match_netid_len;
787         char *startsep = "";
788         char *endsep = "";
789 
790 
791         /* r_netid */
792         p = xdr_inline_decode(xdr, 4);
793         if (unlikely(!p))
794                 goto out_err;
795         nlen = be32_to_cpup(p++);
796 
797         p = xdr_inline_decode(xdr, nlen);
798         if (unlikely(!p))
799                 goto out_err;
800 
801         netid = kmalloc(nlen+1, gfp_flags);
802         if (unlikely(!netid))
803                 goto out_err;
804 
805         netid[nlen] = '\0';
806         memcpy(netid, p, nlen);
807 
808         /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */
809         p = xdr_inline_decode(xdr, 4);
810         if (unlikely(!p))
811                 goto out_free_netid;
812         rlen = be32_to_cpup(p);
813 
814         p = xdr_inline_decode(xdr, rlen);
815         if (unlikely(!p))
816                 goto out_free_netid;
817 
818         /* port is ".ABC.DEF", 8 chars max */
819         if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) {
820                 dprintk("%s: Invalid address, length %d\n", __func__,
821                         rlen);
822                 goto out_free_netid;
823         }
824         buf = kmalloc(rlen + 1, gfp_flags);
825         if (!buf) {
826                 dprintk("%s: Not enough memory\n", __func__);
827                 goto out_free_netid;
828         }
829         buf[rlen] = '\0';
830         memcpy(buf, p, rlen);
831 
832         /* replace port '.' with '-' */
833         portstr = strrchr(buf, '.');
834         if (!portstr) {
835                 dprintk("%s: Failed finding expected dot in port\n",
836                         __func__);
837                 goto out_free_buf;
838         }
839         *portstr = '-';
840 
841         /* find '.' between address and port */
842         portstr = strrchr(buf, '.');
843         if (!portstr) {
844                 dprintk("%s: Failed finding expected dot between address and "
845                         "port\n", __func__);
846                 goto out_free_buf;
847         }
848         *portstr = '\0';
849 
850         da = kzalloc(sizeof(*da), gfp_flags);
851         if (unlikely(!da))
852                 goto out_free_buf;
853 
854         INIT_LIST_HEAD(&da->da_node);
855 
856         if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr,
857                       sizeof(da->da_addr))) {
858                 dprintk("%s: error parsing address %s\n", __func__, buf);
859                 goto out_free_da;
860         }
861 
862         portstr++;
863         sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]);
864         port = htons((tmp[0] << 8) | (tmp[1]));
865 
866         switch (da->da_addr.ss_family) {
867         case AF_INET:
868                 ((struct sockaddr_in *)&da->da_addr)->sin_port = port;
869                 da->da_addrlen = sizeof(struct sockaddr_in);
870                 match_netid = "tcp";
871                 match_netid_len = 3;
872                 break;
873 
874         case AF_INET6:
875                 ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port;
876                 da->da_addrlen = sizeof(struct sockaddr_in6);
877                 match_netid = "tcp6";
878                 match_netid_len = 4;
879                 startsep = "[";
880                 endsep = "]";
881                 break;
882 
883         default:
884                 dprintk("%s: unsupported address family: %u\n",
885                         __func__, da->da_addr.ss_family);
886                 goto out_free_da;
887         }
888 
889         if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) {
890                 dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n",
891                         __func__, netid, match_netid);
892                 goto out_free_da;
893         }
894 
895         /* save human readable address */
896         len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7;
897         da->da_remotestr = kzalloc(len, gfp_flags);
898 
899         /* NULL is ok, only used for dprintk */
900         if (da->da_remotestr)
901                 snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep,
902                          buf, endsep, ntohs(port));
903 
904         dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr);
905         kfree(buf);
906         kfree(netid);
907         return da;
908 
909 out_free_da:
910         kfree(da);
911 out_free_buf:
912         dprintk("%s: Error parsing DS addr: %s\n", __func__, buf);
913         kfree(buf);
914 out_free_netid:
915         kfree(netid);
916 out_err:
917         return NULL;
918 }
919 EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr);
920 
921 void
922 pnfs_layout_mark_request_commit(struct nfs_page *req,
923                                 struct pnfs_layout_segment *lseg,
924                                 struct nfs_commit_info *cinfo,
925                                 u32 ds_commit_idx)
926 {
927         struct list_head *list;
928         struct pnfs_commit_bucket *buckets;
929 
930         mutex_lock(&NFS_I(cinfo->inode)->commit_mutex);
931         buckets = cinfo->ds->buckets;
932         list = &buckets[ds_commit_idx].written;
933         if (list_empty(list)) {
934                 if (!pnfs_is_valid_lseg(lseg)) {
935                         mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
936                         cinfo->completion_ops->resched_write(cinfo, req);
937                         return;
938                 }
939                 /* Non-empty buckets hold a reference on the lseg.  That ref
940                  * is normally transferred to the COMMIT call and released
941                  * there.  It could also be released if the last req is pulled
942                  * off due to a rewrite, in which case it will be done in
943                  * pnfs_common_clear_request_commit
944                  */
945                 WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL);
946                 buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg);
947         }
948         set_bit(PG_COMMIT_TO_DS, &req->wb_flags);
949         cinfo->ds->nwritten++;
950 
951         nfs_request_add_commit_list_locked(req, list, cinfo);
952         mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex);
953         nfs_mark_page_unstable(req->wb_page, cinfo);
954 }
955 EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
956 
957 int
958 pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
959 {
960         int ret;
961 
962         if (!pnfs_layoutcommit_outstanding(inode))
963                 return 0;
964         ret = nfs_commit_inode(inode, FLUSH_SYNC);
965         if (ret < 0)
966                 return ret;
967         if (datasync)
968                 return 0;
969         return pnfs_layoutcommit_inode(inode, true);
970 }
971 EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync);
972 
973 

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