Commit | Line | Data |
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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); | |
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); | |
fe238e60 | 101 | if (cond_resched_lock(&cinfo->inode->i_lock)) |
f54bcf2e TH |
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 | ||
f54bcf2e TH |
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 | ||
fe238e60 | 122 | lockdep_assert_held(&cinfo->inode->i_lock); |
f54bcf2e TH |
123 | ret = pnfs_generic_transfer_commit_list(src, dst, cinfo, max); |
124 | if (ret) { | |
125 | cinfo->ds->nwritten -= ret; | |
126 | cinfo->ds->ncommitting += ret; | |
27571297 TM |
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); | |
f54bcf2e | 131 | bucket->wlseg = NULL; |
27571297 | 132 | } |
f54bcf2e TH |
133 | } |
134 | return ret; | |
135 | } | |
136 | ||
085d1e33 TH |
137 | /* Move reqs from written to committing lists, returning count |
138 | * of number moved. | |
f54bcf2e TH |
139 | */ |
140 | int pnfs_generic_scan_commit_lists(struct nfs_commit_info *cinfo, | |
141 | int max) | |
142 | { | |
143 | int i, rv = 0, cnt; | |
144 | ||
fe238e60 | 145 | lockdep_assert_held(&cinfo->inode->i_lock); |
f54bcf2e TH |
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 | ||
085d1e33 | 156 | /* Pull everything off the committing lists and dump into @dst. */ |
f54bcf2e TH |
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 | ||
fe238e60 | 164 | lockdep_assert_held(&cinfo->inode->i_lock); |
f54bcf2e | 165 | restart: |
f54bcf2e TH |
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; | |
fe238e60 | 171 | spin_unlock(&cinfo->inode->i_lock); |
f54bcf2e | 172 | pnfs_put_lseg(freeme); |
fe238e60 | 173 | spin_lock(&cinfo->inode->i_lock); |
f54bcf2e TH |
174 | goto restart; |
175 | } | |
176 | } | |
177 | cinfo->ds->nwritten = 0; | |
f54bcf2e TH |
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; | |
27571297 | 186 | LIST_HEAD(pages); |
f54bcf2e TH |
187 | int i; |
188 | ||
fe238e60 | 189 | spin_lock(&cinfo->inode->i_lock); |
f54bcf2e TH |
190 | for (i = idx; i < fl_cinfo->nbuckets; i++) { |
191 | bucket = &fl_cinfo->buckets[i]; | |
192 | if (list_empty(&bucket->committing)) | |
193 | continue; | |
f54bcf2e TH |
194 | freeme = bucket->clseg; |
195 | bucket->clseg = NULL; | |
27571297 | 196 | list_splice_init(&bucket->committing, &pages); |
fe238e60 | 197 | spin_unlock(&cinfo->inode->i_lock); |
27571297 | 198 | nfs_retry_commit(&pages, freeme, cinfo, i); |
f54bcf2e | 199 | pnfs_put_lseg(freeme); |
fe238e60 | 200 | spin_lock(&cinfo->inode->i_lock); |
f54bcf2e | 201 | } |
fe238e60 | 202 | spin_unlock(&cinfo->inode->i_lock); |
f54bcf2e TH |
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; | |
722f0b89 TM |
220 | /* |
221 | * If the layout segment is invalid, then let | |
222 | * pnfs_generic_retry_commit() clean up the bucket. | |
223 | */ | |
c296cfe2 | 224 | if (bucket->clseg && !pnfs_is_valid_lseg(bucket->clseg) && |
722f0b89 | 225 | !test_bit(NFS_LSEG_LAYOUTRETURN, &bucket->clseg->pls_flags)) |
5f011483 | 226 | break; |
518662e0 | 227 | data = nfs_commitdata_alloc(false); |
f54bcf2e TH |
228 | if (!data) |
229 | break; | |
230 | data->ds_commit_index = i; | |
f54bcf2e TH |
231 | list_add(&data->pages, list); |
232 | nreq++; | |
233 | } | |
234 | ||
235 | /* Clean up on error */ | |
236 | pnfs_generic_retry_commit(cinfo, i); | |
237 | return nreq; | |
238 | } | |
239 | ||
27571297 TM |
240 | static inline |
241 | void pnfs_fetch_commit_bucket_list(struct list_head *pages, | |
242 | struct nfs_commit_data *data, | |
243 | struct nfs_commit_info *cinfo) | |
244 | { | |
245 | struct pnfs_commit_bucket *bucket; | |
246 | ||
247 | bucket = &cinfo->ds->buckets[data->ds_commit_index]; | |
fe238e60 | 248 | spin_lock(&cinfo->inode->i_lock); |
046be74d | 249 | list_splice_init(&bucket->committing, pages); |
27571297 TM |
250 | data->lseg = bucket->clseg; |
251 | bucket->clseg = NULL; | |
fe238e60 | 252 | spin_unlock(&cinfo->inode->i_lock); |
27571297 TM |
253 | |
254 | } | |
255 | ||
ade8febd | 256 | /* Helper function for pnfs_generic_commit_pagelist to catch an empty |
5e3a9888 WAA |
257 | * page list. This can happen when two commits race. |
258 | * | |
259 | * This must be called instead of nfs_init_commit - call one or the other, but | |
260 | * not both! | |
261 | */ | |
ade8febd WAA |
262 | static bool |
263 | pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages, | |
264 | struct nfs_commit_data *data, | |
265 | struct nfs_commit_info *cinfo) | |
266 | { | |
267 | if (list_empty(pages)) { | |
268 | if (atomic_dec_and_test(&cinfo->mds->rpcs_out)) | |
269 | wake_up_atomic_t(&cinfo->mds->rpcs_out); | |
5e3a9888 WAA |
270 | /* don't call nfs_commitdata_release - it tries to put |
271 | * the open_context which is not acquired until nfs_init_commit | |
272 | * which has not been called on @data */ | |
273 | WARN_ON_ONCE(data->context); | |
274 | nfs_commit_free(data); | |
ade8febd WAA |
275 | return true; |
276 | } | |
277 | ||
278 | return false; | |
279 | } | |
280 | ||
f54bcf2e TH |
281 | /* This follows nfs_commit_list pretty closely */ |
282 | int | |
283 | pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, | |
284 | int how, struct nfs_commit_info *cinfo, | |
285 | int (*initiate_commit)(struct nfs_commit_data *data, | |
286 | int how)) | |
287 | { | |
288 | struct nfs_commit_data *data, *tmp; | |
289 | LIST_HEAD(list); | |
290 | unsigned int nreq = 0; | |
291 | ||
292 | if (!list_empty(mds_pages)) { | |
518662e0 N |
293 | data = nfs_commitdata_alloc(true); |
294 | data->ds_commit_index = -1; | |
295 | list_add(&data->pages, &list); | |
296 | nreq++; | |
f54bcf2e TH |
297 | } |
298 | ||
299 | nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); | |
300 | ||
af7cf057 | 301 | if (nreq == 0) |
f54bcf2e | 302 | goto out; |
f54bcf2e TH |
303 | |
304 | atomic_add(nreq, &cinfo->mds->rpcs_out); | |
305 | ||
306 | list_for_each_entry_safe(data, tmp, &list, pages) { | |
307 | list_del_init(&data->pages); | |
27571297 | 308 | if (data->ds_commit_index < 0) { |
ade8febd WAA |
309 | /* another commit raced with us */ |
310 | if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages, | |
311 | data, cinfo)) | |
312 | continue; | |
313 | ||
f54bcf2e TH |
314 | nfs_init_commit(data, mds_pages, NULL, cinfo); |
315 | nfs_initiate_commit(NFS_CLIENT(inode), data, | |
c36aae9a | 316 | NFS_PROTO(data->inode), |
f54bcf2e TH |
317 | data->mds_ops, how, 0); |
318 | } else { | |
27571297 | 319 | LIST_HEAD(pages); |
f54bcf2e | 320 | |
27571297 | 321 | pnfs_fetch_commit_bucket_list(&pages, data, cinfo); |
ade8febd WAA |
322 | |
323 | /* another commit raced with us */ | |
324 | if (pnfs_generic_commit_cancel_empty_pagelist(&pages, | |
325 | data, cinfo)) | |
326 | continue; | |
327 | ||
27571297 | 328 | nfs_init_commit(data, &pages, data->lseg, cinfo); |
f54bcf2e TH |
329 | initiate_commit(data, how); |
330 | } | |
331 | } | |
332 | out: | |
333 | cinfo->ds->ncommitting = 0; | |
334 | return PNFS_ATTEMPTED; | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); | |
875ae069 PT |
337 | |
338 | /* | |
339 | * Data server cache | |
340 | * | |
341 | * Data servers can be mapped to different device ids. | |
342 | * nfs4_pnfs_ds reference counting | |
343 | * - set to 1 on allocation | |
344 | * - incremented when a device id maps a data server already in the cache. | |
345 | * - decremented when deviceid is removed from the cache. | |
346 | */ | |
347 | static DEFINE_SPINLOCK(nfs4_ds_cache_lock); | |
348 | static LIST_HEAD(nfs4_data_server_cache); | |
349 | ||
350 | /* Debug routines */ | |
351 | static void | |
352 | print_ds(struct nfs4_pnfs_ds *ds) | |
353 | { | |
354 | if (ds == NULL) { | |
355 | printk(KERN_WARNING "%s NULL device\n", __func__); | |
356 | return; | |
357 | } | |
358 | printk(KERN_WARNING " ds %s\n" | |
359 | " ref count %d\n" | |
360 | " client %p\n" | |
361 | " cl_exchange_flags %x\n", | |
362 | ds->ds_remotestr, | |
363 | atomic_read(&ds->ds_count), ds->ds_clp, | |
364 | ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); | |
365 | } | |
366 | ||
367 | static bool | |
368 | same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) | |
369 | { | |
370 | struct sockaddr_in *a, *b; | |
371 | struct sockaddr_in6 *a6, *b6; | |
372 | ||
373 | if (addr1->sa_family != addr2->sa_family) | |
374 | return false; | |
375 | ||
376 | switch (addr1->sa_family) { | |
377 | case AF_INET: | |
378 | a = (struct sockaddr_in *)addr1; | |
379 | b = (struct sockaddr_in *)addr2; | |
380 | ||
381 | if (a->sin_addr.s_addr == b->sin_addr.s_addr && | |
382 | a->sin_port == b->sin_port) | |
383 | return true; | |
384 | break; | |
385 | ||
386 | case AF_INET6: | |
387 | a6 = (struct sockaddr_in6 *)addr1; | |
388 | b6 = (struct sockaddr_in6 *)addr2; | |
389 | ||
390 | /* LINKLOCAL addresses must have matching scope_id */ | |
391 | if (ipv6_addr_src_scope(&a6->sin6_addr) == | |
392 | IPV6_ADDR_SCOPE_LINKLOCAL && | |
393 | a6->sin6_scope_id != b6->sin6_scope_id) | |
394 | return false; | |
395 | ||
396 | if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && | |
397 | a6->sin6_port == b6->sin6_port) | |
398 | return true; | |
399 | break; | |
400 | ||
401 | default: | |
402 | dprintk("%s: unhandled address family: %u\n", | |
403 | __func__, addr1->sa_family); | |
404 | return false; | |
405 | } | |
406 | ||
407 | return false; | |
408 | } | |
409 | ||
6f536936 TM |
410 | /* |
411 | * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, | |
412 | * declare a match. | |
413 | */ | |
875ae069 PT |
414 | static bool |
415 | _same_data_server_addrs_locked(const struct list_head *dsaddrs1, | |
416 | const struct list_head *dsaddrs2) | |
417 | { | |
418 | struct nfs4_pnfs_ds_addr *da1, *da2; | |
6f536936 TM |
419 | struct sockaddr *sa1, *sa2; |
420 | bool match = false; | |
421 | ||
422 | list_for_each_entry(da1, dsaddrs1, da_node) { | |
423 | sa1 = (struct sockaddr *)&da1->da_addr; | |
424 | match = false; | |
425 | list_for_each_entry(da2, dsaddrs2, da_node) { | |
426 | sa2 = (struct sockaddr *)&da2->da_addr; | |
427 | match = same_sockaddr(sa1, sa2); | |
428 | if (match) | |
429 | break; | |
430 | } | |
431 | if (!match) | |
432 | break; | |
875ae069 | 433 | } |
6f536936 | 434 | return match; |
875ae069 PT |
435 | } |
436 | ||
437 | /* | |
438 | * Lookup DS by addresses. nfs4_ds_cache_lock is held | |
439 | */ | |
440 | static struct nfs4_pnfs_ds * | |
441 | _data_server_lookup_locked(const struct list_head *dsaddrs) | |
442 | { | |
443 | struct nfs4_pnfs_ds *ds; | |
444 | ||
445 | list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) | |
446 | if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) | |
447 | return ds; | |
448 | return NULL; | |
449 | } | |
450 | ||
451 | static void destroy_ds(struct nfs4_pnfs_ds *ds) | |
452 | { | |
453 | struct nfs4_pnfs_ds_addr *da; | |
454 | ||
455 | dprintk("--> %s\n", __func__); | |
456 | ifdebug(FACILITY) | |
457 | print_ds(ds); | |
458 | ||
459 | nfs_put_client(ds->ds_clp); | |
460 | ||
461 | while (!list_empty(&ds->ds_addrs)) { | |
462 | da = list_first_entry(&ds->ds_addrs, | |
463 | struct nfs4_pnfs_ds_addr, | |
464 | da_node); | |
465 | list_del_init(&da->da_node); | |
466 | kfree(da->da_remotestr); | |
467 | kfree(da); | |
468 | } | |
469 | ||
470 | kfree(ds->ds_remotestr); | |
471 | kfree(ds); | |
472 | } | |
473 | ||
474 | void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) | |
475 | { | |
476 | if (atomic_dec_and_lock(&ds->ds_count, | |
477 | &nfs4_ds_cache_lock)) { | |
478 | list_del_init(&ds->ds_node); | |
479 | spin_unlock(&nfs4_ds_cache_lock); | |
480 | destroy_ds(ds); | |
481 | } | |
482 | } | |
483 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); | |
484 | ||
485 | /* | |
486 | * Create a string with a human readable address and port to avoid | |
487 | * complicated setup around many dprinks. | |
488 | */ | |
489 | static char * | |
490 | nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) | |
491 | { | |
492 | struct nfs4_pnfs_ds_addr *da; | |
493 | char *remotestr; | |
494 | size_t len; | |
495 | char *p; | |
496 | ||
497 | len = 3; /* '{', '}' and eol */ | |
498 | list_for_each_entry(da, dsaddrs, da_node) { | |
499 | len += strlen(da->da_remotestr) + 1; /* string plus comma */ | |
500 | } | |
501 | ||
502 | remotestr = kzalloc(len, gfp_flags); | |
503 | if (!remotestr) | |
504 | return NULL; | |
505 | ||
506 | p = remotestr; | |
507 | *(p++) = '{'; | |
508 | len--; | |
509 | list_for_each_entry(da, dsaddrs, da_node) { | |
510 | size_t ll = strlen(da->da_remotestr); | |
511 | ||
512 | if (ll > len) | |
513 | goto out_err; | |
514 | ||
515 | memcpy(p, da->da_remotestr, ll); | |
516 | p += ll; | |
517 | len -= ll; | |
518 | ||
519 | if (len < 1) | |
520 | goto out_err; | |
521 | (*p++) = ','; | |
522 | len--; | |
523 | } | |
524 | if (len < 2) | |
525 | goto out_err; | |
526 | *(p++) = '}'; | |
527 | *p = '\0'; | |
528 | return remotestr; | |
529 | out_err: | |
530 | kfree(remotestr); | |
531 | return NULL; | |
532 | } | |
533 | ||
534 | /* | |
535 | * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if | |
536 | * uncached and return cached struct nfs4_pnfs_ds. | |
537 | */ | |
538 | struct nfs4_pnfs_ds * | |
539 | nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) | |
540 | { | |
541 | struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; | |
542 | char *remotestr; | |
543 | ||
544 | if (list_empty(dsaddrs)) { | |
545 | dprintk("%s: no addresses defined\n", __func__); | |
546 | goto out; | |
547 | } | |
548 | ||
549 | ds = kzalloc(sizeof(*ds), gfp_flags); | |
550 | if (!ds) | |
551 | goto out; | |
552 | ||
553 | /* this is only used for debugging, so it's ok if its NULL */ | |
554 | remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); | |
555 | ||
556 | spin_lock(&nfs4_ds_cache_lock); | |
557 | tmp_ds = _data_server_lookup_locked(dsaddrs); | |
558 | if (tmp_ds == NULL) { | |
559 | INIT_LIST_HEAD(&ds->ds_addrs); | |
560 | list_splice_init(dsaddrs, &ds->ds_addrs); | |
561 | ds->ds_remotestr = remotestr; | |
562 | atomic_set(&ds->ds_count, 1); | |
563 | INIT_LIST_HEAD(&ds->ds_node); | |
564 | ds->ds_clp = NULL; | |
565 | list_add(&ds->ds_node, &nfs4_data_server_cache); | |
566 | dprintk("%s add new data server %s\n", __func__, | |
567 | ds->ds_remotestr); | |
568 | } else { | |
569 | kfree(remotestr); | |
570 | kfree(ds); | |
571 | atomic_inc(&tmp_ds->ds_count); | |
572 | dprintk("%s data server %s found, inc'ed ds_count to %d\n", | |
573 | __func__, tmp_ds->ds_remotestr, | |
574 | atomic_read(&tmp_ds->ds_count)); | |
575 | ds = tmp_ds; | |
576 | } | |
577 | spin_unlock(&nfs4_ds_cache_lock); | |
578 | out: | |
579 | return ds; | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); | |
6b7f3cf9 | 582 | |
7405f9e1 PT |
583 | static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) |
584 | { | |
585 | might_sleep(); | |
586 | wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, | |
587 | TASK_KILLABLE); | |
588 | } | |
589 | ||
590 | static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) | |
591 | { | |
592 | smp_mb__before_atomic(); | |
593 | clear_bit(NFS4DS_CONNECTING, &ds->ds_state); | |
594 | smp_mb__after_atomic(); | |
595 | wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); | |
596 | } | |
597 | ||
5f01d953 | 598 | static struct nfs_client *(*get_v3_ds_connect)( |
b224f7cb | 599 | struct nfs_server *mds_srv, |
5f01d953 PT |
600 | const struct sockaddr *ds_addr, |
601 | int ds_addrlen, | |
602 | int ds_proto, | |
603 | unsigned int ds_timeo, | |
7d38de3f | 604 | unsigned int ds_retrans); |
5f01d953 PT |
605 | |
606 | static bool load_v3_ds_connect(void) | |
607 | { | |
608 | if (!get_v3_ds_connect) { | |
609 | get_v3_ds_connect = symbol_request(nfs3_set_ds_client); | |
610 | WARN_ON_ONCE(!get_v3_ds_connect); | |
611 | } | |
612 | ||
613 | return(get_v3_ds_connect != NULL); | |
614 | } | |
615 | ||
df137bc1 | 616 | void nfs4_pnfs_v3_ds_connect_unload(void) |
5f01d953 PT |
617 | { |
618 | if (get_v3_ds_connect) { | |
619 | symbol_put(nfs3_set_ds_client); | |
620 | get_v3_ds_connect = NULL; | |
621 | } | |
622 | } | |
5f01d953 PT |
623 | |
624 | static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, | |
625 | struct nfs4_pnfs_ds *ds, | |
626 | unsigned int timeo, | |
7d38de3f | 627 | unsigned int retrans) |
5f01d953 PT |
628 | { |
629 | struct nfs_client *clp = ERR_PTR(-EIO); | |
630 | struct nfs4_pnfs_ds_addr *da; | |
631 | int status = 0; | |
632 | ||
7d38de3f | 633 | dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); |
5f01d953 PT |
634 | |
635 | if (!load_v3_ds_connect()) | |
636 | goto out; | |
637 | ||
638 | list_for_each_entry(da, &ds->ds_addrs, da_node) { | |
639 | dprintk("%s: DS %s: trying address %s\n", | |
640 | __func__, ds->ds_remotestr, da->da_remotestr); | |
641 | ||
fc821d59 TM |
642 | if (!IS_ERR(clp)) { |
643 | struct xprt_create xprt_args = { | |
644 | .ident = XPRT_TRANSPORT_TCP, | |
645 | .net = clp->cl_net, | |
646 | .dstaddr = (struct sockaddr *)&da->da_addr, | |
647 | .addrlen = da->da_addrlen, | |
648 | .servername = clp->cl_hostname, | |
649 | }; | |
650 | /* Add this address as an alias */ | |
651 | rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, | |
652 | rpc_clnt_test_and_add_xprt, NULL); | |
653 | } else | |
b224f7cb | 654 | clp = get_v3_ds_connect(mds_srv, |
5f01d953 PT |
655 | (struct sockaddr *)&da->da_addr, |
656 | da->da_addrlen, IPPROTO_TCP, | |
7d38de3f | 657 | timeo, retrans); |
5f01d953 PT |
658 | } |
659 | ||
660 | if (IS_ERR(clp)) { | |
661 | status = PTR_ERR(clp); | |
662 | goto out; | |
663 | } | |
664 | ||
665 | smp_wmb(); | |
666 | ds->ds_clp = clp; | |
667 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); | |
668 | out: | |
669 | return status; | |
670 | } | |
671 | ||
672 | static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, | |
7405f9e1 PT |
673 | struct nfs4_pnfs_ds *ds, |
674 | unsigned int timeo, | |
064172f3 | 675 | unsigned int retrans, |
7d38de3f | 676 | u32 minor_version) |
7405f9e1 PT |
677 | { |
678 | struct nfs_client *clp = ERR_PTR(-EIO); | |
679 | struct nfs4_pnfs_ds_addr *da; | |
680 | int status = 0; | |
681 | ||
7d38de3f | 682 | dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); |
7405f9e1 PT |
683 | |
684 | list_for_each_entry(da, &ds->ds_addrs, da_node) { | |
685 | dprintk("%s: DS %s: trying address %s\n", | |
686 | __func__, ds->ds_remotestr, da->da_remotestr); | |
687 | ||
04fa2c6b AA |
688 | if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { |
689 | struct xprt_create xprt_args = { | |
690 | .ident = XPRT_TRANSPORT_TCP, | |
691 | .net = clp->cl_net, | |
692 | .dstaddr = (struct sockaddr *)&da->da_addr, | |
693 | .addrlen = da->da_addrlen, | |
694 | .servername = clp->cl_hostname, | |
695 | }; | |
696 | struct nfs4_add_xprt_data xprtdata = { | |
697 | .clp = clp, | |
698 | .cred = nfs4_get_clid_cred(clp), | |
699 | }; | |
700 | struct rpc_add_xprt_test rpcdata = { | |
701 | .add_xprt_test = clp->cl_mvops->session_trunk, | |
702 | .data = &xprtdata, | |
703 | }; | |
704 | ||
705 | /** | |
706 | * Test this address for session trunking and | |
707 | * add as an alias | |
708 | */ | |
709 | rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, | |
710 | rpc_clnt_setup_test_and_add_xprt, | |
711 | &rpcdata); | |
712 | if (xprtdata.cred) | |
713 | put_rpccred(xprtdata.cred); | |
714 | } else { | |
715 | clp = nfs4_set_ds_client(mds_srv, | |
716 | (struct sockaddr *)&da->da_addr, | |
717 | da->da_addrlen, IPPROTO_TCP, | |
7d38de3f | 718 | timeo, retrans, minor_version); |
04fa2c6b AA |
719 | if (IS_ERR(clp)) |
720 | continue; | |
721 | ||
722 | status = nfs4_init_ds_session(clp, | |
723 | mds_srv->nfs_client->cl_lease_time); | |
724 | if (status) { | |
725 | nfs_put_client(clp); | |
726 | clp = ERR_PTR(-EIO); | |
727 | continue; | |
728 | } | |
729 | ||
730 | } | |
7405f9e1 PT |
731 | } |
732 | ||
733 | if (IS_ERR(clp)) { | |
734 | status = PTR_ERR(clp); | |
735 | goto out; | |
736 | } | |
737 | ||
7405f9e1 PT |
738 | smp_wmb(); |
739 | ds->ds_clp = clp; | |
740 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); | |
741 | out: | |
742 | return status; | |
7405f9e1 PT |
743 | } |
744 | ||
745 | /* | |
746 | * Create an rpc connection to the nfs4_pnfs_ds data server. | |
747 | * Currently only supports IPv4 and IPv6 addresses. | |
a33e4b03 | 748 | * If connection fails, make devid unavailable and return a -errno. |
7405f9e1 | 749 | */ |
a33e4b03 | 750 | int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, |
7405f9e1 | 751 | struct nfs4_deviceid_node *devid, unsigned int timeo, |
7d38de3f | 752 | unsigned int retrans, u32 version, u32 minor_version) |
7405f9e1 | 753 | { |
da066f3f | 754 | int err; |
7405f9e1 | 755 | |
da066f3f WAA |
756 | again: |
757 | err = 0; | |
758 | if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { | |
5f01d953 PT |
759 | if (version == 3) { |
760 | err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, | |
7d38de3f | 761 | retrans); |
5f01d953 PT |
762 | } else if (version == 4) { |
763 | err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, | |
7d38de3f | 764 | retrans, minor_version); |
5f01d953 PT |
765 | } else { |
766 | dprintk("%s: unsupported DS version %d\n", __func__, | |
767 | version); | |
768 | err = -EPROTONOSUPPORT; | |
769 | } | |
770 | ||
7405f9e1 PT |
771 | nfs4_clear_ds_conn_bit(ds); |
772 | } else { | |
773 | nfs4_wait_ds_connect(ds); | |
da066f3f WAA |
774 | |
775 | /* what was waited on didn't connect AND didn't mark unavail */ | |
776 | if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid)) | |
777 | goto again; | |
7405f9e1 | 778 | } |
a33e4b03 WAA |
779 | |
780 | /* | |
781 | * At this point the ds->ds_clp should be ready, but it might have | |
782 | * hit an error. | |
783 | */ | |
da066f3f WAA |
784 | if (!err) { |
785 | if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { | |
786 | WARN_ON_ONCE(ds->ds_clp || | |
787 | !nfs4_test_deviceid_unavailable(devid)); | |
788 | return -EINVAL; | |
789 | } | |
790 | err = nfs_client_init_status(ds->ds_clp); | |
a33e4b03 WAA |
791 | } |
792 | ||
da066f3f | 793 | return err; |
7405f9e1 PT |
794 | } |
795 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); | |
796 | ||
6b7f3cf9 PT |
797 | /* |
798 | * Currently only supports ipv4, ipv6 and one multi-path address. | |
799 | */ | |
800 | struct nfs4_pnfs_ds_addr * | |
801 | nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) | |
802 | { | |
803 | struct nfs4_pnfs_ds_addr *da = NULL; | |
804 | char *buf, *portstr; | |
805 | __be16 port; | |
806 | int nlen, rlen; | |
807 | int tmp[2]; | |
808 | __be32 *p; | |
809 | char *netid, *match_netid; | |
810 | size_t len, match_netid_len; | |
811 | char *startsep = ""; | |
812 | char *endsep = ""; | |
813 | ||
814 | ||
815 | /* r_netid */ | |
816 | p = xdr_inline_decode(xdr, 4); | |
817 | if (unlikely(!p)) | |
818 | goto out_err; | |
819 | nlen = be32_to_cpup(p++); | |
820 | ||
821 | p = xdr_inline_decode(xdr, nlen); | |
822 | if (unlikely(!p)) | |
823 | goto out_err; | |
824 | ||
825 | netid = kmalloc(nlen+1, gfp_flags); | |
826 | if (unlikely(!netid)) | |
827 | goto out_err; | |
828 | ||
829 | netid[nlen] = '\0'; | |
830 | memcpy(netid, p, nlen); | |
831 | ||
832 | /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ | |
833 | p = xdr_inline_decode(xdr, 4); | |
834 | if (unlikely(!p)) | |
835 | goto out_free_netid; | |
836 | rlen = be32_to_cpup(p); | |
837 | ||
838 | p = xdr_inline_decode(xdr, rlen); | |
839 | if (unlikely(!p)) | |
840 | goto out_free_netid; | |
841 | ||
842 | /* port is ".ABC.DEF", 8 chars max */ | |
843 | if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { | |
844 | dprintk("%s: Invalid address, length %d\n", __func__, | |
845 | rlen); | |
846 | goto out_free_netid; | |
847 | } | |
848 | buf = kmalloc(rlen + 1, gfp_flags); | |
849 | if (!buf) { | |
850 | dprintk("%s: Not enough memory\n", __func__); | |
851 | goto out_free_netid; | |
852 | } | |
853 | buf[rlen] = '\0'; | |
854 | memcpy(buf, p, rlen); | |
855 | ||
856 | /* replace port '.' with '-' */ | |
857 | portstr = strrchr(buf, '.'); | |
858 | if (!portstr) { | |
859 | dprintk("%s: Failed finding expected dot in port\n", | |
860 | __func__); | |
861 | goto out_free_buf; | |
862 | } | |
863 | *portstr = '-'; | |
864 | ||
865 | /* find '.' between address and port */ | |
866 | portstr = strrchr(buf, '.'); | |
867 | if (!portstr) { | |
868 | dprintk("%s: Failed finding expected dot between address and " | |
869 | "port\n", __func__); | |
870 | goto out_free_buf; | |
871 | } | |
872 | *portstr = '\0'; | |
873 | ||
874 | da = kzalloc(sizeof(*da), gfp_flags); | |
875 | if (unlikely(!da)) | |
876 | goto out_free_buf; | |
877 | ||
878 | INIT_LIST_HEAD(&da->da_node); | |
879 | ||
880 | if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, | |
881 | sizeof(da->da_addr))) { | |
882 | dprintk("%s: error parsing address %s\n", __func__, buf); | |
883 | goto out_free_da; | |
884 | } | |
885 | ||
886 | portstr++; | |
887 | sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); | |
888 | port = htons((tmp[0] << 8) | (tmp[1])); | |
889 | ||
890 | switch (da->da_addr.ss_family) { | |
891 | case AF_INET: | |
892 | ((struct sockaddr_in *)&da->da_addr)->sin_port = port; | |
893 | da->da_addrlen = sizeof(struct sockaddr_in); | |
894 | match_netid = "tcp"; | |
895 | match_netid_len = 3; | |
896 | break; | |
897 | ||
898 | case AF_INET6: | |
899 | ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; | |
900 | da->da_addrlen = sizeof(struct sockaddr_in6); | |
901 | match_netid = "tcp6"; | |
902 | match_netid_len = 4; | |
903 | startsep = "["; | |
904 | endsep = "]"; | |
905 | break; | |
906 | ||
907 | default: | |
908 | dprintk("%s: unsupported address family: %u\n", | |
909 | __func__, da->da_addr.ss_family); | |
910 | goto out_free_da; | |
911 | } | |
912 | ||
913 | if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { | |
914 | dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", | |
915 | __func__, netid, match_netid); | |
916 | goto out_free_da; | |
917 | } | |
918 | ||
919 | /* save human readable address */ | |
920 | len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; | |
921 | da->da_remotestr = kzalloc(len, gfp_flags); | |
922 | ||
923 | /* NULL is ok, only used for dprintk */ | |
924 | if (da->da_remotestr) | |
925 | snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, | |
926 | buf, endsep, ntohs(port)); | |
927 | ||
928 | dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); | |
929 | kfree(buf); | |
930 | kfree(netid); | |
931 | return da; | |
932 | ||
933 | out_free_da: | |
934 | kfree(da); | |
935 | out_free_buf: | |
936 | dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); | |
937 | kfree(buf); | |
938 | out_free_netid: | |
939 | kfree(netid); | |
940 | out_err: | |
941 | return NULL; | |
942 | } | |
943 | EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); | |
338d00cf TH |
944 | |
945 | void | |
946 | pnfs_layout_mark_request_commit(struct nfs_page *req, | |
947 | struct pnfs_layout_segment *lseg, | |
948 | struct nfs_commit_info *cinfo, | |
949 | u32 ds_commit_idx) | |
950 | { | |
951 | struct list_head *list; | |
952 | struct pnfs_commit_bucket *buckets; | |
953 | ||
fe238e60 | 954 | spin_lock(&cinfo->inode->i_lock); |
338d00cf TH |
955 | buckets = cinfo->ds->buckets; |
956 | list = &buckets[ds_commit_idx].written; | |
957 | if (list_empty(list)) { | |
b20135d0 | 958 | if (!pnfs_is_valid_lseg(lseg)) { |
fe238e60 | 959 | spin_unlock(&cinfo->inode->i_lock); |
b20135d0 TM |
960 | cinfo->completion_ops->resched_write(cinfo, req); |
961 | return; | |
962 | } | |
338d00cf TH |
963 | /* Non-empty buckets hold a reference on the lseg. That ref |
964 | * is normally transferred to the COMMIT call and released | |
965 | * there. It could also be released if the last req is pulled | |
966 | * off due to a rewrite, in which case it will be done in | |
967 | * pnfs_common_clear_request_commit | |
968 | */ | |
969 | WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL); | |
970 | buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg); | |
971 | } | |
972 | set_bit(PG_COMMIT_TO_DS, &req->wb_flags); | |
973 | cinfo->ds->nwritten++; | |
338d00cf | 974 | |
86d80f97 | 975 | nfs_request_add_commit_list_locked(req, list, cinfo); |
fe238e60 | 976 | spin_unlock(&cinfo->inode->i_lock); |
86d80f97 | 977 | nfs_mark_page_unstable(req->wb_page, cinfo); |
338d00cf TH |
978 | } |
979 | EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); | |
5bb89b47 TM |
980 | |
981 | int | |
982 | pnfs_nfs_generic_sync(struct inode *inode, bool datasync) | |
983 | { | |
2e18d4d8 TM |
984 | int ret; |
985 | ||
986 | if (!pnfs_layoutcommit_outstanding(inode)) | |
987 | return 0; | |
988 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
989 | if (ret < 0) | |
990 | return ret; | |
5bb89b47 TM |
991 | if (datasync) |
992 | return 0; | |
993 | return pnfs_layoutcommit_inode(inode, true); | |
994 | } | |
995 | EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); | |
996 |