Commit | Line | Data |
---|---|---|
f54bcf2e TH |
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> | |
6b7f3cf9 | 12 | #include <linux/sunrpc/addr.h> |
5f01d953 | 13 | #include <linux/module.h> |
f54bcf2e | 14 | |
7405f9e1 | 15 | #include "nfs4session.h" |
f54bcf2e TH |
16 | #include "internal.h" |
17 | #include "pnfs.h" | |
18 | ||
875ae069 PT |
19 | #define NFSDBG_FACILITY NFSDBG_PNFS |
20 | ||
f54bcf2e TH |
21 | void pnfs_generic_rw_release(void *data) |
22 | { | |
23 | struct nfs_pgio_header *hdr = data; | |
f54bcf2e | 24 | |
f54bcf2e TH |
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. | |
fe238e60 | 64 | * Note this must be called holding i_lock |
f54bcf2e TH |
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); | |
8205b9ce | 86 | pnfs_put_lseg(freeme); |
f54bcf2e TH |
87 | } |
88 | EXPORT_SYMBOL_GPL(pnfs_generic_clear_request_commit); | |
89 | ||
f54bcf2e TH |
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 | ||
e824f99a | 99 | lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); |
5d2a9d9d | 100 | ret = nfs_scan_commit_list(src, dst, cinfo, max); |
f54bcf2e TH |
101 | if (ret) { |
102 | cinfo->ds->nwritten -= ret; | |
103 | cinfo->ds->ncommitting += ret; | |
27571297 TM |
104 | if (bucket->clseg == NULL) |
105 | bucket->clseg = pnfs_get_lseg(bucket->wlseg); | |
106 | if (list_empty(src)) { | |
8205b9ce | 107 | pnfs_put_lseg(bucket->wlseg); |
f54bcf2e | 108 | bucket->wlseg = NULL; |
27571297 | 109 | } |
f54bcf2e TH |
110 | } |
111 | return ret; | |
112 | } | |
113 | ||
085d1e33 TH |
114 | /* Move reqs from written to committing lists, returning count |
115 | * of number moved. | |
f54bcf2e TH |
116 | */ |
117 | int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, | |
118 | int max) | |
119 | { | |
120 | int i, rv = 0, cnt; | |
121 | ||
e824f99a | 122 | lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); |
f54bcf2e TH |
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 | ||
085d1e33 | 133 | /* Pull everything off the committing lists and dump into @dst. */ |
f54bcf2e TH |
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; | |
e39928f9 | 139 | int nwritten; |
f54bcf2e TH |
140 | int i; |
141 | ||
e824f99a | 142 | lockdep_assert_held(&NFS_I(cinfo->inode)->commit_mutex); |
f54bcf2e | 143 | restart: |
f54bcf2e | 144 | for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { |
5d2a9d9d | 145 | nwritten = nfs_scan_commit_list(&b->written, dst, cinfo, 0); |
e39928f9 TM |
146 | if (!nwritten) |
147 | continue; | |
148 | cinfo->ds->nwritten -= nwritten; | |
149 | if (list_empty(&b->written)) { | |
f54bcf2e TH |
150 | freeme = b->wlseg; |
151 | b->wlseg = NULL; | |
fe238e60 | 152 | spin_unlock(&cinfo->inode->i_lock); |
f54bcf2e | 153 | pnfs_put_lseg(freeme); |
fe238e60 | 154 | spin_lock(&cinfo->inode->i_lock); |
f54bcf2e TH |
155 | goto restart; |
156 | } | |
157 | } | |
f54bcf2e TH |
158 | } |
159 | EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); | |
160 | ||
161 | static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx) | |
162 | { | |
163 | struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; | |
164 | struct pnfs_commit_bucket *bucket; | |
165 | struct pnfs_layout_segment *freeme; | |
41181886 | 166 | struct list_head *pos; |
27571297 | 167 | LIST_HEAD(pages); |
f54bcf2e TH |
168 | int i; |
169 | ||
fe238e60 | 170 | spin_lock(&cinfo->inode->i_lock); |
f54bcf2e TH |
171 | for (i = idx; i < fl_cinfo->nbuckets; i++) { |
172 | bucket = &fl_cinfo->buckets[i]; | |
173 | if (list_empty(&bucket->committing)) | |
174 | continue; | |
f54bcf2e TH |
175 | freeme = bucket->clseg; |
176 | bucket->clseg = NULL; | |
41181886 TM |
177 | list_for_each(pos, &bucket->committing) |
178 | cinfo->ds->ncommitting--; | |
27571297 | 179 | list_splice_init(&bucket->committing, &pages); |
fe238e60 | 180 | spin_unlock(&cinfo->inode->i_lock); |
27571297 | 181 | nfs_retry_commit(&pages, freeme, cinfo, i); |
f54bcf2e | 182 | pnfs_put_lseg(freeme); |
fe238e60 | 183 | spin_lock(&cinfo->inode->i_lock); |
f54bcf2e | 184 | } |
fe238e60 | 185 | spin_unlock(&cinfo->inode->i_lock); |
f54bcf2e TH |
186 | } |
187 | ||
188 | static unsigned int | |
189 | pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo, | |
190 | struct list_head *list) | |
191 | { | |
192 | struct pnfs_ds_commit_info *fl_cinfo; | |
193 | struct pnfs_commit_bucket *bucket; | |
194 | struct nfs_commit_data *data; | |
195 | int i; | |
196 | unsigned int nreq = 0; | |
197 | ||
198 | fl_cinfo = cinfo->ds; | |
199 | bucket = fl_cinfo->buckets; | |
200 | for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) { | |
201 | if (list_empty(&bucket->committing)) | |
202 | continue; | |
518662e0 | 203 | data = nfs_commitdata_alloc(false); |
f54bcf2e TH |
204 | if (!data) |
205 | break; | |
206 | data->ds_commit_index = i; | |
f54bcf2e TH |
207 | list_add(&data->pages, list); |
208 | nreq++; | |
209 | } | |
210 | ||
211 | /* Clean up on error */ | |
212 | pnfs_generic_retry_commit(cinfo, i); | |
213 | return nreq; | |
214 | } | |
215 | ||
27571297 TM |
216 | static inline |
217 | void pnfs_fetch_commit_bucket_list(struct list_head *pages, | |
218 | struct nfs_commit_data *data, | |
219 | struct nfs_commit_info *cinfo) | |
220 | { | |
221 | struct pnfs_commit_bucket *bucket; | |
41181886 | 222 | struct list_head *pos; |
27571297 TM |
223 | |
224 | bucket = &cinfo->ds->buckets[data->ds_commit_index]; | |
fe238e60 | 225 | spin_lock(&cinfo->inode->i_lock); |
41181886 TM |
226 | list_for_each(pos, &bucket->committing) |
227 | cinfo->ds->ncommitting--; | |
046be74d | 228 | list_splice_init(&bucket->committing, pages); |
27571297 TM |
229 | data->lseg = bucket->clseg; |
230 | bucket->clseg = NULL; | |
fe238e60 | 231 | spin_unlock(&cinfo->inode->i_lock); |
27571297 TM |
232 | |
233 | } | |
234 | ||
ade8febd | 235 | /* Helper function for pnfs_generic_commit_pagelist to catch an empty |
5e3a9888 WAA |
236 | * page list. This can happen when two commits race. |
237 | * | |
238 | * This must be called instead of nfs_init_commit - call one or the other, but | |
239 | * not both! | |
240 | */ | |
ade8febd WAA |
241 | static bool |
242 | pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages, | |
243 | struct nfs_commit_data *data, | |
244 | struct nfs_commit_info *cinfo) | |
245 | { | |
246 | if (list_empty(pages)) { | |
247 | if (atomic_dec_and_test(&cinfo->mds->rpcs_out)) | |
248 | wake_up_atomic_t(&cinfo->mds->rpcs_out); | |
5e3a9888 WAA |
249 | /* don't call nfs_commitdata_release - it tries to put |
250 | * the open_context which is not acquired until nfs_init_commit | |
251 | * which has not been called on @data */ | |
252 | WARN_ON_ONCE(data->context); | |
253 | nfs_commit_free(data); | |
ade8febd WAA |
254 | return true; |
255 | } | |
256 | ||
257 | return false; | |
258 | } | |
259 | ||
f54bcf2e TH |
260 | /* This follows nfs_commit_list pretty closely */ |
261 | int | |
262 | pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, | |
263 | int how, struct nfs_commit_info *cinfo, | |
264 | int (*initiate_commit)(struct nfs_commit_data *data, | |
265 | int how)) | |
266 | { | |
267 | struct nfs_commit_data *data, *tmp; | |
268 | LIST_HEAD(list); | |
269 | unsigned int nreq = 0; | |
270 | ||
271 | if (!list_empty(mds_pages)) { | |
518662e0 N |
272 | data = nfs_commitdata_alloc(true); |
273 | data->ds_commit_index = -1; | |
274 | list_add(&data->pages, &list); | |
275 | nreq++; | |
f54bcf2e TH |
276 | } |
277 | ||
278 | nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); | |
279 | ||
af7cf057 | 280 | if (nreq == 0) |
f54bcf2e | 281 | goto out; |
f54bcf2e TH |
282 | |
283 | atomic_add(nreq, &cinfo->mds->rpcs_out); | |
284 | ||
285 | list_for_each_entry_safe(data, tmp, &list, pages) { | |
286 | list_del_init(&data->pages); | |
27571297 | 287 | if (data->ds_commit_index < 0) { |
ade8febd WAA |
288 | /* another commit raced with us */ |
289 | if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages, | |
290 | data, cinfo)) | |
291 | continue; | |
292 | ||
f54bcf2e TH |
293 | nfs_init_commit(data, mds_pages, NULL, cinfo); |
294 | nfs_initiate_commit(NFS_CLIENT(inode), data, | |
c36aae9a | 295 | NFS_PROTO(data->inode), |
f54bcf2e TH |
296 | data->mds_ops, how, 0); |
297 | } else { | |
27571297 | 298 | LIST_HEAD(pages); |
f54bcf2e | 299 | |
27571297 | 300 | pnfs_fetch_commit_bucket_list(&pages, data, cinfo); |
ade8febd WAA |
301 | |
302 | /* another commit raced with us */ | |
303 | if (pnfs_generic_commit_cancel_empty_pagelist(&pages, | |
304 | data, cinfo)) | |
305 | continue; | |
306 | ||
27571297 | 307 | nfs_init_commit(data, &pages, data->lseg, cinfo); |
f54bcf2e TH |
308 | initiate_commit(data, how); |
309 | } | |
310 | } | |
311 | out: | |
f54bcf2e TH |
312 | return PNFS_ATTEMPTED; |
313 | } | |
314 | EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); | |
875ae069 PT |
315 | |
316 | /* | |
317 | * Data server cache | |
318 | * | |
319 | * Data servers can be mapped to different device ids. | |
320 | * nfs4_pnfs_ds reference counting | |
321 | * - set to 1 on allocation | |
322 | * - incremented when a device id maps a data server already in the cache. | |
323 | * - decremented when deviceid is removed from the cache. | |
324 | */ | |
325 | static DEFINE_SPINLOCK(nfs4_ds_cache_lock); | |
326 | static LIST_HEAD(nfs4_data_server_cache); | |
327 | ||
328 | /* Debug routines */ | |
329 | static void | |
330 | print_ds(struct nfs4_pnfs_ds *ds) | |
331 | { | |
332 | if (ds == NULL) { | |
333 | printk(KERN_WARNING "%s NULL device\n", __func__); | |
334 | return; | |
335 | } | |
336 | printk(KERN_WARNING " ds %s\n" | |
337 | " ref count %d\n" | |
338 | " client %p\n" | |
339 | " cl_exchange_flags %x\n", | |
340 | ds->ds_remotestr, | |
a2a5dea7 | 341 | refcount_read(&ds->ds_count), ds->ds_clp, |
875ae069 PT |
342 | ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); |
343 | } | |
344 | ||
345 | static bool | |
346 | same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) | |
347 | { | |
348 | struct sockaddr_in *a, *b; | |
349 | struct sockaddr_in6 *a6, *b6; | |
350 | ||
351 | if (addr1->sa_family != addr2->sa_family) | |
352 | return false; | |
353 | ||
354 | switch (addr1->sa_family) { | |
355 | case AF_INET: | |
356 | a = (struct sockaddr_in *)addr1; | |
357 | b = (struct sockaddr_in *)addr2; | |
358 | ||
359 | if (a->sin_addr.s_addr == b->sin_addr.s_addr && | |
360 | a->sin_port == b->sin_port) | |
361 | return true; | |
362 | break; | |
363 | ||
364 | case AF_INET6: | |
365 | a6 = (struct sockaddr_in6 *)addr1; | |
366 | b6 = (struct sockaddr_in6 *)addr2; | |
367 | ||
368 | /* LINKLOCAL addresses must have matching scope_id */ | |
369 | if (ipv6_addr_src_scope(&a6->sin6_addr) == | |
370 | IPV6_ADDR_SCOPE_LINKLOCAL && | |
371 | a6->sin6_scope_id != b6->sin6_scope_id) | |
372 | return false; | |
373 | ||
374 | if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && | |
375 | a6->sin6_port == b6->sin6_port) | |
376 | return true; | |
377 | break; | |
378 | ||
379 | default: | |
380 | dprintk("%s: unhandled address family: %u\n", | |
381 | __func__, addr1->sa_family); | |
382 | return false; | |
383 | } | |
384 | ||
385 | return false; | |
386 | } | |
387 | ||
6f536936 TM |
388 | /* |
389 | * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, | |
390 | * declare a match. | |
391 | */ | |
875ae069 PT |
392 | static bool |
393 | _same_data_server_addrs_locked(const struct list_head *dsaddrs1, | |
394 | const struct list_head *dsaddrs2) | |
395 | { | |
396 | struct nfs4_pnfs_ds_addr *da1, *da2; | |
6f536936 TM |
397 | struct sockaddr *sa1, *sa2; |
398 | bool match = false; | |
399 | ||
400 | list_for_each_entry(da1, dsaddrs1, da_node) { | |
401 | sa1 = (struct sockaddr *)&da1->da_addr; | |
402 | match = false; | |
403 | list_for_each_entry(da2, dsaddrs2, da_node) { | |
404 | sa2 = (struct sockaddr *)&da2->da_addr; | |
405 | match = same_sockaddr(sa1, sa2); | |
406 | if (match) | |
407 | break; | |
408 | } | |
409 | if (!match) | |
410 | break; | |
875ae069 | 411 | } |
6f536936 | 412 | return match; |
875ae069 PT |
413 | } |
414 | ||
415 | /* | |
416 | * Lookup DS by addresses. nfs4_ds_cache_lock is held | |
417 | */ | |
418 | static struct nfs4_pnfs_ds * | |
419 | _data_server_lookup_locked(const struct list_head *dsaddrs) | |
420 | { | |
421 | struct nfs4_pnfs_ds *ds; | |
422 | ||
423 | list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) | |
424 | if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) | |
425 | return ds; | |
426 | return NULL; | |
427 | } | |
428 | ||
429 | static void destroy_ds(struct nfs4_pnfs_ds *ds) | |
430 | { | |
431 | struct nfs4_pnfs_ds_addr *da; | |
432 | ||
433 | dprintk("--> %s\n", __func__); | |
434 | ifdebug(FACILITY) | |
435 | print_ds(ds); | |
436 | ||
437 | nfs_put_client(ds->ds_clp); | |
438 | ||
439 | while (!list_empty(&ds->ds_addrs)) { | |
440 | da = list_first_entry(&ds->ds_addrs, | |
441 | struct nfs4_pnfs_ds_addr, | |
442 | da_node); | |
443 | list_del_init(&da->da_node); | |
444 | kfree(da->da_remotestr); | |
445 | kfree(da); | |
446 | } | |
447 | ||
448 | kfree(ds->ds_remotestr); | |
449 | kfree(ds); | |
450 | } | |
451 | ||
452 | void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) | |
453 | { | |
a2a5dea7 | 454 | if (refcount_dec_and_lock(&ds->ds_count, |
875ae069 PT |
455 | &nfs4_ds_cache_lock)) { |
456 | list_del_init(&ds->ds_node); | |
457 | spin_unlock(&nfs4_ds_cache_lock); | |
458 | destroy_ds(ds); | |
459 | } | |
460 | } | |
461 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); | |
462 | ||
463 | /* | |
464 | * Create a string with a human readable address and port to avoid | |
465 | * complicated setup around many dprinks. | |
466 | */ | |
467 | static char * | |
468 | nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) | |
469 | { | |
470 | struct nfs4_pnfs_ds_addr *da; | |
471 | char *remotestr; | |
472 | size_t len; | |
473 | char *p; | |
474 | ||
475 | len = 3; /* '{', '}' and eol */ | |
476 | list_for_each_entry(da, dsaddrs, da_node) { | |
477 | len += strlen(da->da_remotestr) + 1; /* string plus comma */ | |
478 | } | |
479 | ||
480 | remotestr = kzalloc(len, gfp_flags); | |
481 | if (!remotestr) | |
482 | return NULL; | |
483 | ||
484 | p = remotestr; | |
485 | *(p++) = '{'; | |
486 | len--; | |
487 | list_for_each_entry(da, dsaddrs, da_node) { | |
488 | size_t ll = strlen(da->da_remotestr); | |
489 | ||
490 | if (ll > len) | |
491 | goto out_err; | |
492 | ||
493 | memcpy(p, da->da_remotestr, ll); | |
494 | p += ll; | |
495 | len -= ll; | |
496 | ||
497 | if (len < 1) | |
498 | goto out_err; | |
499 | (*p++) = ','; | |
500 | len--; | |
501 | } | |
502 | if (len < 2) | |
503 | goto out_err; | |
504 | *(p++) = '}'; | |
505 | *p = '\0'; | |
506 | return remotestr; | |
507 | out_err: | |
508 | kfree(remotestr); | |
509 | return NULL; | |
510 | } | |
511 | ||
512 | /* | |
513 | * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if | |
514 | * uncached and return cached struct nfs4_pnfs_ds. | |
515 | */ | |
516 | struct nfs4_pnfs_ds * | |
517 | nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) | |
518 | { | |
519 | struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; | |
520 | char *remotestr; | |
521 | ||
522 | if (list_empty(dsaddrs)) { | |
523 | dprintk("%s: no addresses defined\n", __func__); | |
524 | goto out; | |
525 | } | |
526 | ||
527 | ds = kzalloc(sizeof(*ds), gfp_flags); | |
528 | if (!ds) | |
529 | goto out; | |
530 | ||
531 | /* this is only used for debugging, so it's ok if its NULL */ | |
532 | remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); | |
533 | ||
534 | spin_lock(&nfs4_ds_cache_lock); | |
535 | tmp_ds = _data_server_lookup_locked(dsaddrs); | |
536 | if (tmp_ds == NULL) { | |
537 | INIT_LIST_HEAD(&ds->ds_addrs); | |
538 | list_splice_init(dsaddrs, &ds->ds_addrs); | |
539 | ds->ds_remotestr = remotestr; | |
a2a5dea7 | 540 | refcount_set(&ds->ds_count, 1); |
875ae069 PT |
541 | INIT_LIST_HEAD(&ds->ds_node); |
542 | ds->ds_clp = NULL; | |
543 | list_add(&ds->ds_node, &nfs4_data_server_cache); | |
544 | dprintk("%s add new data server %s\n", __func__, | |
545 | ds->ds_remotestr); | |
546 | } else { | |
547 | kfree(remotestr); | |
548 | kfree(ds); | |
a2a5dea7 | 549 | refcount_inc(&tmp_ds->ds_count); |
875ae069 PT |
550 | dprintk("%s data server %s found, inc'ed ds_count to %d\n", |
551 | __func__, tmp_ds->ds_remotestr, | |
a2a5dea7 | 552 | refcount_read(&tmp_ds->ds_count)); |
875ae069 PT |
553 | ds = tmp_ds; |
554 | } | |
555 | spin_unlock(&nfs4_ds_cache_lock); | |
556 | out: | |
557 | return ds; | |
558 | } | |
559 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); | |
6b7f3cf9 | 560 | |
7405f9e1 PT |
561 | static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) |
562 | { | |
563 | might_sleep(); | |
564 | wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, | |
565 | TASK_KILLABLE); | |
566 | } | |
567 | ||
568 | static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) | |
569 | { | |
570 | smp_mb__before_atomic(); | |
571 | clear_bit(NFS4DS_CONNECTING, &ds->ds_state); | |
572 | smp_mb__after_atomic(); | |
573 | wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); | |
574 | } | |
575 | ||
5f01d953 | 576 | static struct nfs_client *(*get_v3_ds_connect)( |
b224f7cb | 577 | struct nfs_server *mds_srv, |
5f01d953 PT |
578 | const struct sockaddr *ds_addr, |
579 | int ds_addrlen, | |
580 | int ds_proto, | |
581 | unsigned int ds_timeo, | |
7d38de3f | 582 | unsigned int ds_retrans); |
5f01d953 PT |
583 | |
584 | static bool load_v3_ds_connect(void) | |
585 | { | |
586 | if (!get_v3_ds_connect) { | |
587 | get_v3_ds_connect = symbol_request(nfs3_set_ds_client); | |
588 | WARN_ON_ONCE(!get_v3_ds_connect); | |
589 | } | |
590 | ||
591 | return(get_v3_ds_connect != NULL); | |
592 | } | |
593 | ||
df137bc1 | 594 | void nfs4_pnfs_v3_ds_connect_unload(void) |
5f01d953 PT |
595 | { |
596 | if (get_v3_ds_connect) { | |
597 | symbol_put(nfs3_set_ds_client); | |
598 | get_v3_ds_connect = NULL; | |
599 | } | |
600 | } | |
5f01d953 PT |
601 | |
602 | static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, | |
603 | struct nfs4_pnfs_ds *ds, | |
604 | unsigned int timeo, | |
7d38de3f | 605 | unsigned int retrans) |
5f01d953 PT |
606 | { |
607 | struct nfs_client *clp = ERR_PTR(-EIO); | |
608 | struct nfs4_pnfs_ds_addr *da; | |
609 | int status = 0; | |
610 | ||
7d38de3f | 611 | dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); |
5f01d953 PT |
612 | |
613 | if (!load_v3_ds_connect()) | |
614 | goto out; | |
615 | ||
616 | list_for_each_entry(da, &ds->ds_addrs, da_node) { | |
617 | dprintk("%s: DS %s: trying address %s\n", | |
618 | __func__, ds->ds_remotestr, da->da_remotestr); | |
619 | ||
fc821d59 TM |
620 | if (!IS_ERR(clp)) { |
621 | struct xprt_create xprt_args = { | |
622 | .ident = XPRT_TRANSPORT_TCP, | |
623 | .net = clp->cl_net, | |
624 | .dstaddr = (struct sockaddr *)&da->da_addr, | |
625 | .addrlen = da->da_addrlen, | |
626 | .servername = clp->cl_hostname, | |
627 | }; | |
628 | /* Add this address as an alias */ | |
629 | rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, | |
630 | rpc_clnt_test_and_add_xprt, NULL); | |
631 | } else | |
b224f7cb | 632 | clp = get_v3_ds_connect(mds_srv, |
5f01d953 PT |
633 | (struct sockaddr *)&da->da_addr, |
634 | da->da_addrlen, IPPROTO_TCP, | |
7d38de3f | 635 | timeo, retrans); |
5f01d953 PT |
636 | } |
637 | ||
638 | if (IS_ERR(clp)) { | |
639 | status = PTR_ERR(clp); | |
640 | goto out; | |
641 | } | |
642 | ||
643 | smp_wmb(); | |
644 | ds->ds_clp = clp; | |
645 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); | |
646 | out: | |
647 | return status; | |
648 | } | |
649 | ||
650 | static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, | |
7405f9e1 PT |
651 | struct nfs4_pnfs_ds *ds, |
652 | unsigned int timeo, | |
064172f3 | 653 | unsigned int retrans, |
7d38de3f | 654 | u32 minor_version) |
7405f9e1 PT |
655 | { |
656 | struct nfs_client *clp = ERR_PTR(-EIO); | |
657 | struct nfs4_pnfs_ds_addr *da; | |
658 | int status = 0; | |
659 | ||
7d38de3f | 660 | dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); |
7405f9e1 PT |
661 | |
662 | list_for_each_entry(da, &ds->ds_addrs, da_node) { | |
663 | dprintk("%s: DS %s: trying address %s\n", | |
664 | __func__, ds->ds_remotestr, da->da_remotestr); | |
665 | ||
04fa2c6b AA |
666 | if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { |
667 | struct xprt_create xprt_args = { | |
668 | .ident = XPRT_TRANSPORT_TCP, | |
669 | .net = clp->cl_net, | |
670 | .dstaddr = (struct sockaddr *)&da->da_addr, | |
671 | .addrlen = da->da_addrlen, | |
672 | .servername = clp->cl_hostname, | |
673 | }; | |
674 | struct nfs4_add_xprt_data xprtdata = { | |
675 | .clp = clp, | |
676 | .cred = nfs4_get_clid_cred(clp), | |
677 | }; | |
678 | struct rpc_add_xprt_test rpcdata = { | |
679 | .add_xprt_test = clp->cl_mvops->session_trunk, | |
680 | .data = &xprtdata, | |
681 | }; | |
682 | ||
683 | /** | |
684 | * Test this address for session trunking and | |
685 | * add as an alias | |
686 | */ | |
687 | rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, | |
688 | rpc_clnt_setup_test_and_add_xprt, | |
689 | &rpcdata); | |
690 | if (xprtdata.cred) | |
691 | put_rpccred(xprtdata.cred); | |
692 | } else { | |
693 | clp = nfs4_set_ds_client(mds_srv, | |
694 | (struct sockaddr *)&da->da_addr, | |
695 | da->da_addrlen, IPPROTO_TCP, | |
7d38de3f | 696 | timeo, retrans, minor_version); |
04fa2c6b AA |
697 | if (IS_ERR(clp)) |
698 | continue; | |
699 | ||
700 | status = nfs4_init_ds_session(clp, | |
701 | mds_srv->nfs_client->cl_lease_time); | |
702 | if (status) { | |
703 | nfs_put_client(clp); | |
704 | clp = ERR_PTR(-EIO); | |
705 | continue; | |
706 | } | |
707 | ||
708 | } | |
7405f9e1 PT |
709 | } |
710 | ||
711 | if (IS_ERR(clp)) { | |
712 | status = PTR_ERR(clp); | |
713 | goto out; | |
714 | } | |
715 | ||
7405f9e1 PT |
716 | smp_wmb(); |
717 | ds->ds_clp = clp; | |
718 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); | |
719 | out: | |
720 | return status; | |
7405f9e1 PT |
721 | } |
722 | ||
723 | /* | |
724 | * Create an rpc connection to the nfs4_pnfs_ds data server. | |
725 | * Currently only supports IPv4 and IPv6 addresses. | |
a33e4b03 | 726 | * If connection fails, make devid unavailable and return a -errno. |
7405f9e1 | 727 | */ |
a33e4b03 | 728 | int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, |
7405f9e1 | 729 | struct nfs4_deviceid_node *devid, unsigned int timeo, |
7d38de3f | 730 | unsigned int retrans, u32 version, u32 minor_version) |
7405f9e1 | 731 | { |
da066f3f | 732 | int err; |
7405f9e1 | 733 | |
da066f3f WAA |
734 | again: |
735 | err = 0; | |
736 | if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { | |
5f01d953 PT |
737 | if (version == 3) { |
738 | err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, | |
7d38de3f | 739 | retrans); |
5f01d953 PT |
740 | } else if (version == 4) { |
741 | err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, | |
7d38de3f | 742 | retrans, minor_version); |
5f01d953 PT |
743 | } else { |
744 | dprintk("%s: unsupported DS version %d\n", __func__, | |
745 | version); | |
746 | err = -EPROTONOSUPPORT; | |
747 | } | |
748 | ||
7405f9e1 PT |
749 | nfs4_clear_ds_conn_bit(ds); |
750 | } else { | |
751 | nfs4_wait_ds_connect(ds); | |
da066f3f WAA |
752 | |
753 | /* what was waited on didn't connect AND didn't mark unavail */ | |
754 | if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid)) | |
755 | goto again; | |
7405f9e1 | 756 | } |
a33e4b03 WAA |
757 | |
758 | /* | |
759 | * At this point the ds->ds_clp should be ready, but it might have | |
760 | * hit an error. | |
761 | */ | |
da066f3f WAA |
762 | if (!err) { |
763 | if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { | |
764 | WARN_ON_ONCE(ds->ds_clp || | |
765 | !nfs4_test_deviceid_unavailable(devid)); | |
766 | return -EINVAL; | |
767 | } | |
768 | err = nfs_client_init_status(ds->ds_clp); | |
a33e4b03 WAA |
769 | } |
770 | ||
da066f3f | 771 | return err; |
7405f9e1 PT |
772 | } |
773 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); | |
774 | ||
6b7f3cf9 PT |
775 | /* |
776 | * Currently only supports ipv4, ipv6 and one multi-path address. | |
777 | */ | |
778 | struct nfs4_pnfs_ds_addr * | |
779 | nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) | |
780 | { | |
781 | struct nfs4_pnfs_ds_addr *da = NULL; | |
782 | char *buf, *portstr; | |
783 | __be16 port; | |
784 | int nlen, rlen; | |
785 | int tmp[2]; | |
786 | __be32 *p; | |
787 | char *netid, *match_netid; | |
788 | size_t len, match_netid_len; | |
789 | char *startsep = ""; | |
790 | char *endsep = ""; | |
791 | ||
792 | ||
793 | /* r_netid */ | |
794 | p = xdr_inline_decode(xdr, 4); | |
795 | if (unlikely(!p)) | |
796 | goto out_err; | |
797 | nlen = be32_to_cpup(p++); | |
798 | ||
799 | p = xdr_inline_decode(xdr, nlen); | |
800 | if (unlikely(!p)) | |
801 | goto out_err; | |
802 | ||
803 | netid = kmalloc(nlen+1, gfp_flags); | |
804 | if (unlikely(!netid)) | |
805 | goto out_err; | |
806 | ||
807 | netid[nlen] = '\0'; | |
808 | memcpy(netid, p, nlen); | |
809 | ||
810 | /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ | |
811 | p = xdr_inline_decode(xdr, 4); | |
812 | if (unlikely(!p)) | |
813 | goto out_free_netid; | |
814 | rlen = be32_to_cpup(p); | |
815 | ||
816 | p = xdr_inline_decode(xdr, rlen); | |
817 | if (unlikely(!p)) | |
818 | goto out_free_netid; | |
819 | ||
820 | /* port is ".ABC.DEF", 8 chars max */ | |
821 | if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { | |
822 | dprintk("%s: Invalid address, length %d\n", __func__, | |
823 | rlen); | |
824 | goto out_free_netid; | |
825 | } | |
826 | buf = kmalloc(rlen + 1, gfp_flags); | |
827 | if (!buf) { | |
828 | dprintk("%s: Not enough memory\n", __func__); | |
829 | goto out_free_netid; | |
830 | } | |
831 | buf[rlen] = '\0'; | |
832 | memcpy(buf, p, rlen); | |
833 | ||
834 | /* replace port '.' with '-' */ | |
835 | portstr = strrchr(buf, '.'); | |
836 | if (!portstr) { | |
837 | dprintk("%s: Failed finding expected dot in port\n", | |
838 | __func__); | |
839 | goto out_free_buf; | |
840 | } | |
841 | *portstr = '-'; | |
842 | ||
843 | /* find '.' between address and port */ | |
844 | portstr = strrchr(buf, '.'); | |
845 | if (!portstr) { | |
846 | dprintk("%s: Failed finding expected dot between address and " | |
847 | "port\n", __func__); | |
848 | goto out_free_buf; | |
849 | } | |
850 | *portstr = '\0'; | |
851 | ||
852 | da = kzalloc(sizeof(*da), gfp_flags); | |
853 | if (unlikely(!da)) | |
854 | goto out_free_buf; | |
855 | ||
856 | INIT_LIST_HEAD(&da->da_node); | |
857 | ||
858 | if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, | |
859 | sizeof(da->da_addr))) { | |
860 | dprintk("%s: error parsing address %s\n", __func__, buf); | |
861 | goto out_free_da; | |
862 | } | |
863 | ||
864 | portstr++; | |
865 | sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); | |
866 | port = htons((tmp[0] << 8) | (tmp[1])); | |
867 | ||
868 | switch (da->da_addr.ss_family) { | |
869 | case AF_INET: | |
870 | ((struct sockaddr_in *)&da->da_addr)->sin_port = port; | |
871 | da->da_addrlen = sizeof(struct sockaddr_in); | |
872 | match_netid = "tcp"; | |
873 | match_netid_len = 3; | |
874 | break; | |
875 | ||
876 | case AF_INET6: | |
877 | ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; | |
878 | da->da_addrlen = sizeof(struct sockaddr_in6); | |
879 | match_netid = "tcp6"; | |
880 | match_netid_len = 4; | |
881 | startsep = "["; | |
882 | endsep = "]"; | |
883 | break; | |
884 | ||
885 | default: | |
886 | dprintk("%s: unsupported address family: %u\n", | |
887 | __func__, da->da_addr.ss_family); | |
888 | goto out_free_da; | |
889 | } | |
890 | ||
891 | if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { | |
892 | dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", | |
893 | __func__, netid, match_netid); | |
894 | goto out_free_da; | |
895 | } | |
896 | ||
897 | /* save human readable address */ | |
898 | len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; | |
899 | da->da_remotestr = kzalloc(len, gfp_flags); | |
900 | ||
901 | /* NULL is ok, only used for dprintk */ | |
902 | if (da->da_remotestr) | |
903 | snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, | |
904 | buf, endsep, ntohs(port)); | |
905 | ||
906 | dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); | |
907 | kfree(buf); | |
908 | kfree(netid); | |
909 | return da; | |
910 | ||
911 | out_free_da: | |
912 | kfree(da); | |
913 | out_free_buf: | |
914 | dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); | |
915 | kfree(buf); | |
916 | out_free_netid: | |
917 | kfree(netid); | |
918 | out_err: | |
919 | return NULL; | |
920 | } | |
921 | EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); | |
338d00cf TH |
922 | |
923 | void | |
924 | pnfs_layout_mark_request_commit(struct nfs_page *req, | |
925 | struct pnfs_layout_segment *lseg, | |
926 | struct nfs_commit_info *cinfo, | |
927 | u32 ds_commit_idx) | |
928 | { | |
929 | struct list_head *list; | |
930 | struct pnfs_commit_bucket *buckets; | |
931 | ||
e824f99a | 932 | mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); |
338d00cf TH |
933 | buckets = cinfo->ds->buckets; |
934 | list = &buckets[ds_commit_idx].written; | |
935 | if (list_empty(list)) { | |
b20135d0 | 936 | if (!pnfs_is_valid_lseg(lseg)) { |
e824f99a | 937 | mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); |
b20135d0 TM |
938 | cinfo->completion_ops->resched_write(cinfo, req); |
939 | return; | |
940 | } | |
338d00cf TH |
941 | /* Non-empty buckets hold a reference on the lseg. That ref |
942 | * is normally transferred to the COMMIT call and released | |
943 | * there. It could also be released if the last req is pulled | |
944 | * off due to a rewrite, in which case it will be done in | |
945 | * pnfs_common_clear_request_commit | |
946 | */ | |
947 | WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL); | |
948 | buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg); | |
949 | } | |
950 | set_bit(PG_COMMIT_TO_DS, &req->wb_flags); | |
951 | cinfo->ds->nwritten++; | |
338d00cf | 952 | |
86d80f97 | 953 | nfs_request_add_commit_list_locked(req, list, cinfo); |
e824f99a | 954 | mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); |
86d80f97 | 955 | nfs_mark_page_unstable(req->wb_page, cinfo); |
338d00cf TH |
956 | } |
957 | EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); | |
5bb89b47 TM |
958 | |
959 | int | |
960 | pnfs_nfs_generic_sync(struct inode *inode, bool datasync) | |
961 | { | |
2e18d4d8 TM |
962 | int ret; |
963 | ||
964 | if (!pnfs_layoutcommit_outstanding(inode)) | |
965 | return 0; | |
966 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
967 | if (ret < 0) | |
968 | return ret; | |
5bb89b47 TM |
969 | if (datasync) |
970 | return 0; | |
971 | return pnfs_layoutcommit_inode(inode, true); | |
972 | } | |
973 | EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); | |
974 |