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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; | |
e39928f9 | 162 | int nwritten; |
f54bcf2e TH |
163 | int i; |
164 | ||
fe238e60 | 165 | lockdep_assert_held(&cinfo->inode->i_lock); |
f54bcf2e | 166 | restart: |
f54bcf2e | 167 | for (i = 0, b = cinfo->ds->buckets; i < cinfo->ds->nbuckets; i++, b++) { |
e39928f9 TM |
168 | nwritten = pnfs_generic_transfer_commit_list(&b->written, |
169 | dst, cinfo, 0); | |
170 | if (!nwritten) | |
171 | continue; | |
172 | cinfo->ds->nwritten -= nwritten; | |
173 | if (list_empty(&b->written)) { | |
f54bcf2e TH |
174 | freeme = b->wlseg; |
175 | b->wlseg = NULL; | |
fe238e60 | 176 | spin_unlock(&cinfo->inode->i_lock); |
f54bcf2e | 177 | pnfs_put_lseg(freeme); |
fe238e60 | 178 | spin_lock(&cinfo->inode->i_lock); |
f54bcf2e TH |
179 | goto restart; |
180 | } | |
181 | } | |
f54bcf2e TH |
182 | } |
183 | EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); | |
184 | ||
185 | static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx) | |
186 | { | |
187 | struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; | |
188 | struct pnfs_commit_bucket *bucket; | |
189 | struct pnfs_layout_segment *freeme; | |
27571297 | 190 | LIST_HEAD(pages); |
f54bcf2e TH |
191 | int i; |
192 | ||
fe238e60 | 193 | spin_lock(&cinfo->inode->i_lock); |
f54bcf2e TH |
194 | for (i = idx; i < fl_cinfo->nbuckets; i++) { |
195 | bucket = &fl_cinfo->buckets[i]; | |
196 | if (list_empty(&bucket->committing)) | |
197 | continue; | |
f54bcf2e TH |
198 | freeme = bucket->clseg; |
199 | bucket->clseg = NULL; | |
27571297 | 200 | list_splice_init(&bucket->committing, &pages); |
fe238e60 | 201 | spin_unlock(&cinfo->inode->i_lock); |
27571297 | 202 | nfs_retry_commit(&pages, freeme, cinfo, i); |
f54bcf2e | 203 | pnfs_put_lseg(freeme); |
fe238e60 | 204 | spin_lock(&cinfo->inode->i_lock); |
f54bcf2e | 205 | } |
fe238e60 | 206 | spin_unlock(&cinfo->inode->i_lock); |
f54bcf2e TH |
207 | } |
208 | ||
209 | static unsigned int | |
210 | pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo, | |
211 | struct list_head *list) | |
212 | { | |
213 | struct pnfs_ds_commit_info *fl_cinfo; | |
214 | struct pnfs_commit_bucket *bucket; | |
215 | struct nfs_commit_data *data; | |
216 | int i; | |
217 | unsigned int nreq = 0; | |
218 | ||
219 | fl_cinfo = cinfo->ds; | |
220 | bucket = fl_cinfo->buckets; | |
221 | for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) { | |
222 | if (list_empty(&bucket->committing)) | |
223 | continue; | |
722f0b89 TM |
224 | /* |
225 | * If the layout segment is invalid, then let | |
226 | * pnfs_generic_retry_commit() clean up the bucket. | |
227 | */ | |
c296cfe2 | 228 | if (bucket->clseg && !pnfs_is_valid_lseg(bucket->clseg) && |
722f0b89 | 229 | !test_bit(NFS_LSEG_LAYOUTRETURN, &bucket->clseg->pls_flags)) |
5f011483 | 230 | break; |
518662e0 | 231 | data = nfs_commitdata_alloc(false); |
f54bcf2e TH |
232 | if (!data) |
233 | break; | |
234 | data->ds_commit_index = i; | |
f54bcf2e TH |
235 | list_add(&data->pages, list); |
236 | nreq++; | |
237 | } | |
238 | ||
239 | /* Clean up on error */ | |
240 | pnfs_generic_retry_commit(cinfo, i); | |
241 | return nreq; | |
242 | } | |
243 | ||
27571297 TM |
244 | static inline |
245 | void pnfs_fetch_commit_bucket_list(struct list_head *pages, | |
246 | struct nfs_commit_data *data, | |
247 | struct nfs_commit_info *cinfo) | |
248 | { | |
249 | struct pnfs_commit_bucket *bucket; | |
250 | ||
251 | bucket = &cinfo->ds->buckets[data->ds_commit_index]; | |
fe238e60 | 252 | spin_lock(&cinfo->inode->i_lock); |
046be74d | 253 | list_splice_init(&bucket->committing, pages); |
27571297 TM |
254 | data->lseg = bucket->clseg; |
255 | bucket->clseg = NULL; | |
fe238e60 | 256 | spin_unlock(&cinfo->inode->i_lock); |
27571297 TM |
257 | |
258 | } | |
259 | ||
ade8febd | 260 | /* Helper function for pnfs_generic_commit_pagelist to catch an empty |
5e3a9888 WAA |
261 | * page list. This can happen when two commits race. |
262 | * | |
263 | * This must be called instead of nfs_init_commit - call one or the other, but | |
264 | * not both! | |
265 | */ | |
ade8febd WAA |
266 | static bool |
267 | pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages, | |
268 | struct nfs_commit_data *data, | |
269 | struct nfs_commit_info *cinfo) | |
270 | { | |
271 | if (list_empty(pages)) { | |
272 | if (atomic_dec_and_test(&cinfo->mds->rpcs_out)) | |
273 | wake_up_atomic_t(&cinfo->mds->rpcs_out); | |
5e3a9888 WAA |
274 | /* don't call nfs_commitdata_release - it tries to put |
275 | * the open_context which is not acquired until nfs_init_commit | |
276 | * which has not been called on @data */ | |
277 | WARN_ON_ONCE(data->context); | |
278 | nfs_commit_free(data); | |
ade8febd WAA |
279 | return true; |
280 | } | |
281 | ||
282 | return false; | |
283 | } | |
284 | ||
f54bcf2e TH |
285 | /* This follows nfs_commit_list pretty closely */ |
286 | int | |
287 | pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, | |
288 | int how, struct nfs_commit_info *cinfo, | |
289 | int (*initiate_commit)(struct nfs_commit_data *data, | |
290 | int how)) | |
291 | { | |
292 | struct nfs_commit_data *data, *tmp; | |
293 | LIST_HEAD(list); | |
294 | unsigned int nreq = 0; | |
295 | ||
296 | if (!list_empty(mds_pages)) { | |
518662e0 N |
297 | data = nfs_commitdata_alloc(true); |
298 | data->ds_commit_index = -1; | |
299 | list_add(&data->pages, &list); | |
300 | nreq++; | |
f54bcf2e TH |
301 | } |
302 | ||
303 | nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); | |
304 | ||
af7cf057 | 305 | if (nreq == 0) |
f54bcf2e | 306 | goto out; |
f54bcf2e TH |
307 | |
308 | atomic_add(nreq, &cinfo->mds->rpcs_out); | |
309 | ||
310 | list_for_each_entry_safe(data, tmp, &list, pages) { | |
311 | list_del_init(&data->pages); | |
27571297 | 312 | if (data->ds_commit_index < 0) { |
ade8febd WAA |
313 | /* another commit raced with us */ |
314 | if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages, | |
315 | data, cinfo)) | |
316 | continue; | |
317 | ||
f54bcf2e TH |
318 | nfs_init_commit(data, mds_pages, NULL, cinfo); |
319 | nfs_initiate_commit(NFS_CLIENT(inode), data, | |
c36aae9a | 320 | NFS_PROTO(data->inode), |
f54bcf2e TH |
321 | data->mds_ops, how, 0); |
322 | } else { | |
27571297 | 323 | LIST_HEAD(pages); |
f54bcf2e | 324 | |
27571297 | 325 | pnfs_fetch_commit_bucket_list(&pages, data, cinfo); |
ade8febd WAA |
326 | |
327 | /* another commit raced with us */ | |
328 | if (pnfs_generic_commit_cancel_empty_pagelist(&pages, | |
329 | data, cinfo)) | |
330 | continue; | |
331 | ||
27571297 | 332 | nfs_init_commit(data, &pages, data->lseg, cinfo); |
f54bcf2e TH |
333 | initiate_commit(data, how); |
334 | } | |
335 | } | |
336 | out: | |
337 | cinfo->ds->ncommitting = 0; | |
338 | return PNFS_ATTEMPTED; | |
339 | } | |
340 | EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); | |
875ae069 PT |
341 | |
342 | /* | |
343 | * Data server cache | |
344 | * | |
345 | * Data servers can be mapped to different device ids. | |
346 | * nfs4_pnfs_ds reference counting | |
347 | * - set to 1 on allocation | |
348 | * - incremented when a device id maps a data server already in the cache. | |
349 | * - decremented when deviceid is removed from the cache. | |
350 | */ | |
351 | static DEFINE_SPINLOCK(nfs4_ds_cache_lock); | |
352 | static LIST_HEAD(nfs4_data_server_cache); | |
353 | ||
354 | /* Debug routines */ | |
355 | static void | |
356 | print_ds(struct nfs4_pnfs_ds *ds) | |
357 | { | |
358 | if (ds == NULL) { | |
359 | printk(KERN_WARNING "%s NULL device\n", __func__); | |
360 | return; | |
361 | } | |
362 | printk(KERN_WARNING " ds %s\n" | |
363 | " ref count %d\n" | |
364 | " client %p\n" | |
365 | " cl_exchange_flags %x\n", | |
366 | ds->ds_remotestr, | |
367 | atomic_read(&ds->ds_count), ds->ds_clp, | |
368 | ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); | |
369 | } | |
370 | ||
371 | static bool | |
372 | same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) | |
373 | { | |
374 | struct sockaddr_in *a, *b; | |
375 | struct sockaddr_in6 *a6, *b6; | |
376 | ||
377 | if (addr1->sa_family != addr2->sa_family) | |
378 | return false; | |
379 | ||
380 | switch (addr1->sa_family) { | |
381 | case AF_INET: | |
382 | a = (struct sockaddr_in *)addr1; | |
383 | b = (struct sockaddr_in *)addr2; | |
384 | ||
385 | if (a->sin_addr.s_addr == b->sin_addr.s_addr && | |
386 | a->sin_port == b->sin_port) | |
387 | return true; | |
388 | break; | |
389 | ||
390 | case AF_INET6: | |
391 | a6 = (struct sockaddr_in6 *)addr1; | |
392 | b6 = (struct sockaddr_in6 *)addr2; | |
393 | ||
394 | /* LINKLOCAL addresses must have matching scope_id */ | |
395 | if (ipv6_addr_src_scope(&a6->sin6_addr) == | |
396 | IPV6_ADDR_SCOPE_LINKLOCAL && | |
397 | a6->sin6_scope_id != b6->sin6_scope_id) | |
398 | return false; | |
399 | ||
400 | if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && | |
401 | a6->sin6_port == b6->sin6_port) | |
402 | return true; | |
403 | break; | |
404 | ||
405 | default: | |
406 | dprintk("%s: unhandled address family: %u\n", | |
407 | __func__, addr1->sa_family); | |
408 | return false; | |
409 | } | |
410 | ||
411 | return false; | |
412 | } | |
413 | ||
6f536936 TM |
414 | /* |
415 | * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, | |
416 | * declare a match. | |
417 | */ | |
875ae069 PT |
418 | static bool |
419 | _same_data_server_addrs_locked(const struct list_head *dsaddrs1, | |
420 | const struct list_head *dsaddrs2) | |
421 | { | |
422 | struct nfs4_pnfs_ds_addr *da1, *da2; | |
6f536936 TM |
423 | struct sockaddr *sa1, *sa2; |
424 | bool match = false; | |
425 | ||
426 | list_for_each_entry(da1, dsaddrs1, da_node) { | |
427 | sa1 = (struct sockaddr *)&da1->da_addr; | |
428 | match = false; | |
429 | list_for_each_entry(da2, dsaddrs2, da_node) { | |
430 | sa2 = (struct sockaddr *)&da2->da_addr; | |
431 | match = same_sockaddr(sa1, sa2); | |
432 | if (match) | |
433 | break; | |
434 | } | |
435 | if (!match) | |
436 | break; | |
875ae069 | 437 | } |
6f536936 | 438 | return match; |
875ae069 PT |
439 | } |
440 | ||
441 | /* | |
442 | * Lookup DS by addresses. nfs4_ds_cache_lock is held | |
443 | */ | |
444 | static struct nfs4_pnfs_ds * | |
445 | _data_server_lookup_locked(const struct list_head *dsaddrs) | |
446 | { | |
447 | struct nfs4_pnfs_ds *ds; | |
448 | ||
449 | list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) | |
450 | if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) | |
451 | return ds; | |
452 | return NULL; | |
453 | } | |
454 | ||
455 | static void destroy_ds(struct nfs4_pnfs_ds *ds) | |
456 | { | |
457 | struct nfs4_pnfs_ds_addr *da; | |
458 | ||
459 | dprintk("--> %s\n", __func__); | |
460 | ifdebug(FACILITY) | |
461 | print_ds(ds); | |
462 | ||
463 | nfs_put_client(ds->ds_clp); | |
464 | ||
465 | while (!list_empty(&ds->ds_addrs)) { | |
466 | da = list_first_entry(&ds->ds_addrs, | |
467 | struct nfs4_pnfs_ds_addr, | |
468 | da_node); | |
469 | list_del_init(&da->da_node); | |
470 | kfree(da->da_remotestr); | |
471 | kfree(da); | |
472 | } | |
473 | ||
474 | kfree(ds->ds_remotestr); | |
475 | kfree(ds); | |
476 | } | |
477 | ||
478 | void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) | |
479 | { | |
480 | if (atomic_dec_and_lock(&ds->ds_count, | |
481 | &nfs4_ds_cache_lock)) { | |
482 | list_del_init(&ds->ds_node); | |
483 | spin_unlock(&nfs4_ds_cache_lock); | |
484 | destroy_ds(ds); | |
485 | } | |
486 | } | |
487 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); | |
488 | ||
489 | /* | |
490 | * Create a string with a human readable address and port to avoid | |
491 | * complicated setup around many dprinks. | |
492 | */ | |
493 | static char * | |
494 | nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) | |
495 | { | |
496 | struct nfs4_pnfs_ds_addr *da; | |
497 | char *remotestr; | |
498 | size_t len; | |
499 | char *p; | |
500 | ||
501 | len = 3; /* '{', '}' and eol */ | |
502 | list_for_each_entry(da, dsaddrs, da_node) { | |
503 | len += strlen(da->da_remotestr) + 1; /* string plus comma */ | |
504 | } | |
505 | ||
506 | remotestr = kzalloc(len, gfp_flags); | |
507 | if (!remotestr) | |
508 | return NULL; | |
509 | ||
510 | p = remotestr; | |
511 | *(p++) = '{'; | |
512 | len--; | |
513 | list_for_each_entry(da, dsaddrs, da_node) { | |
514 | size_t ll = strlen(da->da_remotestr); | |
515 | ||
516 | if (ll > len) | |
517 | goto out_err; | |
518 | ||
519 | memcpy(p, da->da_remotestr, ll); | |
520 | p += ll; | |
521 | len -= ll; | |
522 | ||
523 | if (len < 1) | |
524 | goto out_err; | |
525 | (*p++) = ','; | |
526 | len--; | |
527 | } | |
528 | if (len < 2) | |
529 | goto out_err; | |
530 | *(p++) = '}'; | |
531 | *p = '\0'; | |
532 | return remotestr; | |
533 | out_err: | |
534 | kfree(remotestr); | |
535 | return NULL; | |
536 | } | |
537 | ||
538 | /* | |
539 | * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if | |
540 | * uncached and return cached struct nfs4_pnfs_ds. | |
541 | */ | |
542 | struct nfs4_pnfs_ds * | |
543 | nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) | |
544 | { | |
545 | struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; | |
546 | char *remotestr; | |
547 | ||
548 | if (list_empty(dsaddrs)) { | |
549 | dprintk("%s: no addresses defined\n", __func__); | |
550 | goto out; | |
551 | } | |
552 | ||
553 | ds = kzalloc(sizeof(*ds), gfp_flags); | |
554 | if (!ds) | |
555 | goto out; | |
556 | ||
557 | /* this is only used for debugging, so it's ok if its NULL */ | |
558 | remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); | |
559 | ||
560 | spin_lock(&nfs4_ds_cache_lock); | |
561 | tmp_ds = _data_server_lookup_locked(dsaddrs); | |
562 | if (tmp_ds == NULL) { | |
563 | INIT_LIST_HEAD(&ds->ds_addrs); | |
564 | list_splice_init(dsaddrs, &ds->ds_addrs); | |
565 | ds->ds_remotestr = remotestr; | |
566 | atomic_set(&ds->ds_count, 1); | |
567 | INIT_LIST_HEAD(&ds->ds_node); | |
568 | ds->ds_clp = NULL; | |
569 | list_add(&ds->ds_node, &nfs4_data_server_cache); | |
570 | dprintk("%s add new data server %s\n", __func__, | |
571 | ds->ds_remotestr); | |
572 | } else { | |
573 | kfree(remotestr); | |
574 | kfree(ds); | |
575 | atomic_inc(&tmp_ds->ds_count); | |
576 | dprintk("%s data server %s found, inc'ed ds_count to %d\n", | |
577 | __func__, tmp_ds->ds_remotestr, | |
578 | atomic_read(&tmp_ds->ds_count)); | |
579 | ds = tmp_ds; | |
580 | } | |
581 | spin_unlock(&nfs4_ds_cache_lock); | |
582 | out: | |
583 | return ds; | |
584 | } | |
585 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); | |
6b7f3cf9 | 586 | |
7405f9e1 PT |
587 | static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) |
588 | { | |
589 | might_sleep(); | |
590 | wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, | |
591 | TASK_KILLABLE); | |
592 | } | |
593 | ||
594 | static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) | |
595 | { | |
596 | smp_mb__before_atomic(); | |
597 | clear_bit(NFS4DS_CONNECTING, &ds->ds_state); | |
598 | smp_mb__after_atomic(); | |
599 | wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); | |
600 | } | |
601 | ||
5f01d953 | 602 | static struct nfs_client *(*get_v3_ds_connect)( |
b224f7cb | 603 | struct nfs_server *mds_srv, |
5f01d953 PT |
604 | const struct sockaddr *ds_addr, |
605 | int ds_addrlen, | |
606 | int ds_proto, | |
607 | unsigned int ds_timeo, | |
7d38de3f | 608 | unsigned int ds_retrans); |
5f01d953 PT |
609 | |
610 | static bool load_v3_ds_connect(void) | |
611 | { | |
612 | if (!get_v3_ds_connect) { | |
613 | get_v3_ds_connect = symbol_request(nfs3_set_ds_client); | |
614 | WARN_ON_ONCE(!get_v3_ds_connect); | |
615 | } | |
616 | ||
617 | return(get_v3_ds_connect != NULL); | |
618 | } | |
619 | ||
df137bc1 | 620 | void nfs4_pnfs_v3_ds_connect_unload(void) |
5f01d953 PT |
621 | { |
622 | if (get_v3_ds_connect) { | |
623 | symbol_put(nfs3_set_ds_client); | |
624 | get_v3_ds_connect = NULL; | |
625 | } | |
626 | } | |
5f01d953 PT |
627 | |
628 | static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, | |
629 | struct nfs4_pnfs_ds *ds, | |
630 | unsigned int timeo, | |
7d38de3f | 631 | unsigned int retrans) |
5f01d953 PT |
632 | { |
633 | struct nfs_client *clp = ERR_PTR(-EIO); | |
634 | struct nfs4_pnfs_ds_addr *da; | |
635 | int status = 0; | |
636 | ||
7d38de3f | 637 | dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); |
5f01d953 PT |
638 | |
639 | if (!load_v3_ds_connect()) | |
640 | goto out; | |
641 | ||
642 | list_for_each_entry(da, &ds->ds_addrs, da_node) { | |
643 | dprintk("%s: DS %s: trying address %s\n", | |
644 | __func__, ds->ds_remotestr, da->da_remotestr); | |
645 | ||
fc821d59 TM |
646 | if (!IS_ERR(clp)) { |
647 | struct xprt_create xprt_args = { | |
648 | .ident = XPRT_TRANSPORT_TCP, | |
649 | .net = clp->cl_net, | |
650 | .dstaddr = (struct sockaddr *)&da->da_addr, | |
651 | .addrlen = da->da_addrlen, | |
652 | .servername = clp->cl_hostname, | |
653 | }; | |
654 | /* Add this address as an alias */ | |
655 | rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, | |
656 | rpc_clnt_test_and_add_xprt, NULL); | |
657 | } else | |
b224f7cb | 658 | clp = get_v3_ds_connect(mds_srv, |
5f01d953 PT |
659 | (struct sockaddr *)&da->da_addr, |
660 | da->da_addrlen, IPPROTO_TCP, | |
7d38de3f | 661 | timeo, retrans); |
5f01d953 PT |
662 | } |
663 | ||
664 | if (IS_ERR(clp)) { | |
665 | status = PTR_ERR(clp); | |
666 | goto out; | |
667 | } | |
668 | ||
669 | smp_wmb(); | |
670 | ds->ds_clp = clp; | |
671 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); | |
672 | out: | |
673 | return status; | |
674 | } | |
675 | ||
676 | static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, | |
7405f9e1 PT |
677 | struct nfs4_pnfs_ds *ds, |
678 | unsigned int timeo, | |
064172f3 | 679 | unsigned int retrans, |
7d38de3f | 680 | u32 minor_version) |
7405f9e1 PT |
681 | { |
682 | struct nfs_client *clp = ERR_PTR(-EIO); | |
683 | struct nfs4_pnfs_ds_addr *da; | |
684 | int status = 0; | |
685 | ||
7d38de3f | 686 | dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); |
7405f9e1 PT |
687 | |
688 | list_for_each_entry(da, &ds->ds_addrs, da_node) { | |
689 | dprintk("%s: DS %s: trying address %s\n", | |
690 | __func__, ds->ds_remotestr, da->da_remotestr); | |
691 | ||
04fa2c6b AA |
692 | if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { |
693 | struct xprt_create xprt_args = { | |
694 | .ident = XPRT_TRANSPORT_TCP, | |
695 | .net = clp->cl_net, | |
696 | .dstaddr = (struct sockaddr *)&da->da_addr, | |
697 | .addrlen = da->da_addrlen, | |
698 | .servername = clp->cl_hostname, | |
699 | }; | |
700 | struct nfs4_add_xprt_data xprtdata = { | |
701 | .clp = clp, | |
702 | .cred = nfs4_get_clid_cred(clp), | |
703 | }; | |
704 | struct rpc_add_xprt_test rpcdata = { | |
705 | .add_xprt_test = clp->cl_mvops->session_trunk, | |
706 | .data = &xprtdata, | |
707 | }; | |
708 | ||
709 | /** | |
710 | * Test this address for session trunking and | |
711 | * add as an alias | |
712 | */ | |
713 | rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, | |
714 | rpc_clnt_setup_test_and_add_xprt, | |
715 | &rpcdata); | |
716 | if (xprtdata.cred) | |
717 | put_rpccred(xprtdata.cred); | |
718 | } else { | |
719 | clp = nfs4_set_ds_client(mds_srv, | |
720 | (struct sockaddr *)&da->da_addr, | |
721 | da->da_addrlen, IPPROTO_TCP, | |
7d38de3f | 722 | timeo, retrans, minor_version); |
04fa2c6b AA |
723 | if (IS_ERR(clp)) |
724 | continue; | |
725 | ||
726 | status = nfs4_init_ds_session(clp, | |
727 | mds_srv->nfs_client->cl_lease_time); | |
728 | if (status) { | |
729 | nfs_put_client(clp); | |
730 | clp = ERR_PTR(-EIO); | |
731 | continue; | |
732 | } | |
733 | ||
734 | } | |
7405f9e1 PT |
735 | } |
736 | ||
737 | if (IS_ERR(clp)) { | |
738 | status = PTR_ERR(clp); | |
739 | goto out; | |
740 | } | |
741 | ||
7405f9e1 PT |
742 | smp_wmb(); |
743 | ds->ds_clp = clp; | |
744 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); | |
745 | out: | |
746 | return status; | |
7405f9e1 PT |
747 | } |
748 | ||
749 | /* | |
750 | * Create an rpc connection to the nfs4_pnfs_ds data server. | |
751 | * Currently only supports IPv4 and IPv6 addresses. | |
a33e4b03 | 752 | * If connection fails, make devid unavailable and return a -errno. |
7405f9e1 | 753 | */ |
a33e4b03 | 754 | int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, |
7405f9e1 | 755 | struct nfs4_deviceid_node *devid, unsigned int timeo, |
7d38de3f | 756 | unsigned int retrans, u32 version, u32 minor_version) |
7405f9e1 | 757 | { |
da066f3f | 758 | int err; |
7405f9e1 | 759 | |
da066f3f WAA |
760 | again: |
761 | err = 0; | |
762 | if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { | |
5f01d953 PT |
763 | if (version == 3) { |
764 | err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, | |
7d38de3f | 765 | retrans); |
5f01d953 PT |
766 | } else if (version == 4) { |
767 | err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, | |
7d38de3f | 768 | retrans, minor_version); |
5f01d953 PT |
769 | } else { |
770 | dprintk("%s: unsupported DS version %d\n", __func__, | |
771 | version); | |
772 | err = -EPROTONOSUPPORT; | |
773 | } | |
774 | ||
7405f9e1 PT |
775 | nfs4_clear_ds_conn_bit(ds); |
776 | } else { | |
777 | nfs4_wait_ds_connect(ds); | |
da066f3f WAA |
778 | |
779 | /* what was waited on didn't connect AND didn't mark unavail */ | |
780 | if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid)) | |
781 | goto again; | |
7405f9e1 | 782 | } |
a33e4b03 WAA |
783 | |
784 | /* | |
785 | * At this point the ds->ds_clp should be ready, but it might have | |
786 | * hit an error. | |
787 | */ | |
da066f3f WAA |
788 | if (!err) { |
789 | if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { | |
790 | WARN_ON_ONCE(ds->ds_clp || | |
791 | !nfs4_test_deviceid_unavailable(devid)); | |
792 | return -EINVAL; | |
793 | } | |
794 | err = nfs_client_init_status(ds->ds_clp); | |
a33e4b03 WAA |
795 | } |
796 | ||
da066f3f | 797 | return err; |
7405f9e1 PT |
798 | } |
799 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); | |
800 | ||
6b7f3cf9 PT |
801 | /* |
802 | * Currently only supports ipv4, ipv6 and one multi-path address. | |
803 | */ | |
804 | struct nfs4_pnfs_ds_addr * | |
805 | nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) | |
806 | { | |
807 | struct nfs4_pnfs_ds_addr *da = NULL; | |
808 | char *buf, *portstr; | |
809 | __be16 port; | |
810 | int nlen, rlen; | |
811 | int tmp[2]; | |
812 | __be32 *p; | |
813 | char *netid, *match_netid; | |
814 | size_t len, match_netid_len; | |
815 | char *startsep = ""; | |
816 | char *endsep = ""; | |
817 | ||
818 | ||
819 | /* r_netid */ | |
820 | p = xdr_inline_decode(xdr, 4); | |
821 | if (unlikely(!p)) | |
822 | goto out_err; | |
823 | nlen = be32_to_cpup(p++); | |
824 | ||
825 | p = xdr_inline_decode(xdr, nlen); | |
826 | if (unlikely(!p)) | |
827 | goto out_err; | |
828 | ||
829 | netid = kmalloc(nlen+1, gfp_flags); | |
830 | if (unlikely(!netid)) | |
831 | goto out_err; | |
832 | ||
833 | netid[nlen] = '\0'; | |
834 | memcpy(netid, p, nlen); | |
835 | ||
836 | /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ | |
837 | p = xdr_inline_decode(xdr, 4); | |
838 | if (unlikely(!p)) | |
839 | goto out_free_netid; | |
840 | rlen = be32_to_cpup(p); | |
841 | ||
842 | p = xdr_inline_decode(xdr, rlen); | |
843 | if (unlikely(!p)) | |
844 | goto out_free_netid; | |
845 | ||
846 | /* port is ".ABC.DEF", 8 chars max */ | |
847 | if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { | |
848 | dprintk("%s: Invalid address, length %d\n", __func__, | |
849 | rlen); | |
850 | goto out_free_netid; | |
851 | } | |
852 | buf = kmalloc(rlen + 1, gfp_flags); | |
853 | if (!buf) { | |
854 | dprintk("%s: Not enough memory\n", __func__); | |
855 | goto out_free_netid; | |
856 | } | |
857 | buf[rlen] = '\0'; | |
858 | memcpy(buf, p, rlen); | |
859 | ||
860 | /* replace port '.' with '-' */ | |
861 | portstr = strrchr(buf, '.'); | |
862 | if (!portstr) { | |
863 | dprintk("%s: Failed finding expected dot in port\n", | |
864 | __func__); | |
865 | goto out_free_buf; | |
866 | } | |
867 | *portstr = '-'; | |
868 | ||
869 | /* find '.' between address and port */ | |
870 | portstr = strrchr(buf, '.'); | |
871 | if (!portstr) { | |
872 | dprintk("%s: Failed finding expected dot between address and " | |
873 | "port\n", __func__); | |
874 | goto out_free_buf; | |
875 | } | |
876 | *portstr = '\0'; | |
877 | ||
878 | da = kzalloc(sizeof(*da), gfp_flags); | |
879 | if (unlikely(!da)) | |
880 | goto out_free_buf; | |
881 | ||
882 | INIT_LIST_HEAD(&da->da_node); | |
883 | ||
884 | if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, | |
885 | sizeof(da->da_addr))) { | |
886 | dprintk("%s: error parsing address %s\n", __func__, buf); | |
887 | goto out_free_da; | |
888 | } | |
889 | ||
890 | portstr++; | |
891 | sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); | |
892 | port = htons((tmp[0] << 8) | (tmp[1])); | |
893 | ||
894 | switch (da->da_addr.ss_family) { | |
895 | case AF_INET: | |
896 | ((struct sockaddr_in *)&da->da_addr)->sin_port = port; | |
897 | da->da_addrlen = sizeof(struct sockaddr_in); | |
898 | match_netid = "tcp"; | |
899 | match_netid_len = 3; | |
900 | break; | |
901 | ||
902 | case AF_INET6: | |
903 | ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; | |
904 | da->da_addrlen = sizeof(struct sockaddr_in6); | |
905 | match_netid = "tcp6"; | |
906 | match_netid_len = 4; | |
907 | startsep = "["; | |
908 | endsep = "]"; | |
909 | break; | |
910 | ||
911 | default: | |
912 | dprintk("%s: unsupported address family: %u\n", | |
913 | __func__, da->da_addr.ss_family); | |
914 | goto out_free_da; | |
915 | } | |
916 | ||
917 | if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { | |
918 | dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", | |
919 | __func__, netid, match_netid); | |
920 | goto out_free_da; | |
921 | } | |
922 | ||
923 | /* save human readable address */ | |
924 | len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; | |
925 | da->da_remotestr = kzalloc(len, gfp_flags); | |
926 | ||
927 | /* NULL is ok, only used for dprintk */ | |
928 | if (da->da_remotestr) | |
929 | snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, | |
930 | buf, endsep, ntohs(port)); | |
931 | ||
932 | dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); | |
933 | kfree(buf); | |
934 | kfree(netid); | |
935 | return da; | |
936 | ||
937 | out_free_da: | |
938 | kfree(da); | |
939 | out_free_buf: | |
940 | dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); | |
941 | kfree(buf); | |
942 | out_free_netid: | |
943 | kfree(netid); | |
944 | out_err: | |
945 | return NULL; | |
946 | } | |
947 | EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); | |
338d00cf TH |
948 | |
949 | void | |
950 | pnfs_layout_mark_request_commit(struct nfs_page *req, | |
951 | struct pnfs_layout_segment *lseg, | |
952 | struct nfs_commit_info *cinfo, | |
953 | u32 ds_commit_idx) | |
954 | { | |
955 | struct list_head *list; | |
956 | struct pnfs_commit_bucket *buckets; | |
957 | ||
fe238e60 | 958 | spin_lock(&cinfo->inode->i_lock); |
338d00cf TH |
959 | buckets = cinfo->ds->buckets; |
960 | list = &buckets[ds_commit_idx].written; | |
961 | if (list_empty(list)) { | |
b20135d0 | 962 | if (!pnfs_is_valid_lseg(lseg)) { |
fe238e60 | 963 | spin_unlock(&cinfo->inode->i_lock); |
b20135d0 TM |
964 | cinfo->completion_ops->resched_write(cinfo, req); |
965 | return; | |
966 | } | |
338d00cf TH |
967 | /* Non-empty buckets hold a reference on the lseg. That ref |
968 | * is normally transferred to the COMMIT call and released | |
969 | * there. It could also be released if the last req is pulled | |
970 | * off due to a rewrite, in which case it will be done in | |
971 | * pnfs_common_clear_request_commit | |
972 | */ | |
973 | WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL); | |
974 | buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg); | |
975 | } | |
976 | set_bit(PG_COMMIT_TO_DS, &req->wb_flags); | |
977 | cinfo->ds->nwritten++; | |
338d00cf | 978 | |
86d80f97 | 979 | nfs_request_add_commit_list_locked(req, list, cinfo); |
fe238e60 | 980 | spin_unlock(&cinfo->inode->i_lock); |
86d80f97 | 981 | nfs_mark_page_unstable(req->wb_page, cinfo); |
338d00cf TH |
982 | } |
983 | EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); | |
5bb89b47 TM |
984 | |
985 | int | |
986 | pnfs_nfs_generic_sync(struct inode *inode, bool datasync) | |
987 | { | |
2e18d4d8 TM |
988 | int ret; |
989 | ||
990 | if (!pnfs_layoutcommit_outstanding(inode)) | |
991 | return 0; | |
992 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
993 | if (ret < 0) | |
994 | return ret; | |
5bb89b47 TM |
995 | if (datasync) |
996 | return 0; | |
997 | return pnfs_layoutcommit_inode(inode, true); | |
998 | } | |
999 | EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); | |
1000 |