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. | |
d0fbb1d8 | 64 | * Note this must be called holding nfsi->commit_mutex |
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; | |
f54bcf2e TH |
152 | pnfs_put_lseg(freeme); |
153 | goto restart; | |
154 | } | |
155 | } | |
f54bcf2e TH |
156 | } |
157 | EXPORT_SYMBOL_GPL(pnfs_generic_recover_commit_reqs); | |
158 | ||
159 | static void pnfs_generic_retry_commit(struct nfs_commit_info *cinfo, int idx) | |
160 | { | |
161 | struct pnfs_ds_commit_info *fl_cinfo = cinfo->ds; | |
162 | struct pnfs_commit_bucket *bucket; | |
163 | struct pnfs_layout_segment *freeme; | |
41181886 | 164 | struct list_head *pos; |
27571297 | 165 | LIST_HEAD(pages); |
f54bcf2e TH |
166 | int i; |
167 | ||
d0fbb1d8 | 168 | mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); |
f54bcf2e TH |
169 | for (i = idx; i < fl_cinfo->nbuckets; i++) { |
170 | bucket = &fl_cinfo->buckets[i]; | |
171 | if (list_empty(&bucket->committing)) | |
172 | continue; | |
f54bcf2e TH |
173 | freeme = bucket->clseg; |
174 | bucket->clseg = NULL; | |
41181886 TM |
175 | list_for_each(pos, &bucket->committing) |
176 | cinfo->ds->ncommitting--; | |
27571297 | 177 | list_splice_init(&bucket->committing, &pages); |
d0fbb1d8 | 178 | mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); |
27571297 | 179 | nfs_retry_commit(&pages, freeme, cinfo, i); |
f54bcf2e | 180 | pnfs_put_lseg(freeme); |
d0fbb1d8 | 181 | mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); |
f54bcf2e | 182 | } |
d0fbb1d8 | 183 | mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); |
f54bcf2e TH |
184 | } |
185 | ||
186 | static unsigned int | |
187 | pnfs_generic_alloc_ds_commits(struct nfs_commit_info *cinfo, | |
188 | struct list_head *list) | |
189 | { | |
190 | struct pnfs_ds_commit_info *fl_cinfo; | |
191 | struct pnfs_commit_bucket *bucket; | |
192 | struct nfs_commit_data *data; | |
193 | int i; | |
194 | unsigned int nreq = 0; | |
195 | ||
196 | fl_cinfo = cinfo->ds; | |
197 | bucket = fl_cinfo->buckets; | |
198 | for (i = 0; i < fl_cinfo->nbuckets; i++, bucket++) { | |
199 | if (list_empty(&bucket->committing)) | |
200 | continue; | |
518662e0 | 201 | data = nfs_commitdata_alloc(false); |
f54bcf2e TH |
202 | if (!data) |
203 | break; | |
204 | data->ds_commit_index = i; | |
f54bcf2e TH |
205 | list_add(&data->pages, list); |
206 | nreq++; | |
207 | } | |
208 | ||
209 | /* Clean up on error */ | |
210 | pnfs_generic_retry_commit(cinfo, i); | |
211 | return nreq; | |
212 | } | |
213 | ||
27571297 TM |
214 | static inline |
215 | void pnfs_fetch_commit_bucket_list(struct list_head *pages, | |
216 | struct nfs_commit_data *data, | |
217 | struct nfs_commit_info *cinfo) | |
218 | { | |
219 | struct pnfs_commit_bucket *bucket; | |
41181886 | 220 | struct list_head *pos; |
27571297 TM |
221 | |
222 | bucket = &cinfo->ds->buckets[data->ds_commit_index]; | |
d0fbb1d8 | 223 | mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); |
41181886 TM |
224 | list_for_each(pos, &bucket->committing) |
225 | cinfo->ds->ncommitting--; | |
046be74d | 226 | list_splice_init(&bucket->committing, pages); |
27571297 TM |
227 | data->lseg = bucket->clseg; |
228 | bucket->clseg = NULL; | |
d0fbb1d8 | 229 | mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); |
27571297 TM |
230 | |
231 | } | |
232 | ||
ade8febd | 233 | /* Helper function for pnfs_generic_commit_pagelist to catch an empty |
5e3a9888 WAA |
234 | * page list. This can happen when two commits race. |
235 | * | |
236 | * This must be called instead of nfs_init_commit - call one or the other, but | |
237 | * not both! | |
238 | */ | |
ade8febd WAA |
239 | static bool |
240 | pnfs_generic_commit_cancel_empty_pagelist(struct list_head *pages, | |
241 | struct nfs_commit_data *data, | |
242 | struct nfs_commit_info *cinfo) | |
243 | { | |
244 | if (list_empty(pages)) { | |
245 | if (atomic_dec_and_test(&cinfo->mds->rpcs_out)) | |
723c921e | 246 | wake_up_var(&cinfo->mds->rpcs_out); |
5e3a9888 WAA |
247 | /* don't call nfs_commitdata_release - it tries to put |
248 | * the open_context which is not acquired until nfs_init_commit | |
249 | * which has not been called on @data */ | |
250 | WARN_ON_ONCE(data->context); | |
251 | nfs_commit_free(data); | |
ade8febd WAA |
252 | return true; |
253 | } | |
254 | ||
255 | return false; | |
256 | } | |
257 | ||
f54bcf2e TH |
258 | /* This follows nfs_commit_list pretty closely */ |
259 | int | |
260 | pnfs_generic_commit_pagelist(struct inode *inode, struct list_head *mds_pages, | |
261 | int how, struct nfs_commit_info *cinfo, | |
262 | int (*initiate_commit)(struct nfs_commit_data *data, | |
263 | int how)) | |
264 | { | |
265 | struct nfs_commit_data *data, *tmp; | |
266 | LIST_HEAD(list); | |
267 | unsigned int nreq = 0; | |
268 | ||
269 | if (!list_empty(mds_pages)) { | |
518662e0 N |
270 | data = nfs_commitdata_alloc(true); |
271 | data->ds_commit_index = -1; | |
272 | list_add(&data->pages, &list); | |
273 | nreq++; | |
f54bcf2e TH |
274 | } |
275 | ||
276 | nreq += pnfs_generic_alloc_ds_commits(cinfo, &list); | |
277 | ||
af7cf057 | 278 | if (nreq == 0) |
f54bcf2e | 279 | goto out; |
f54bcf2e TH |
280 | |
281 | atomic_add(nreq, &cinfo->mds->rpcs_out); | |
282 | ||
283 | list_for_each_entry_safe(data, tmp, &list, pages) { | |
284 | list_del_init(&data->pages); | |
27571297 | 285 | if (data->ds_commit_index < 0) { |
ade8febd WAA |
286 | /* another commit raced with us */ |
287 | if (pnfs_generic_commit_cancel_empty_pagelist(mds_pages, | |
288 | data, cinfo)) | |
289 | continue; | |
290 | ||
f54bcf2e TH |
291 | nfs_init_commit(data, mds_pages, NULL, cinfo); |
292 | nfs_initiate_commit(NFS_CLIENT(inode), data, | |
c36aae9a | 293 | NFS_PROTO(data->inode), |
f54bcf2e TH |
294 | data->mds_ops, how, 0); |
295 | } else { | |
27571297 | 296 | LIST_HEAD(pages); |
f54bcf2e | 297 | |
27571297 | 298 | pnfs_fetch_commit_bucket_list(&pages, data, cinfo); |
ade8febd WAA |
299 | |
300 | /* another commit raced with us */ | |
301 | if (pnfs_generic_commit_cancel_empty_pagelist(&pages, | |
302 | data, cinfo)) | |
303 | continue; | |
304 | ||
27571297 | 305 | nfs_init_commit(data, &pages, data->lseg, cinfo); |
f54bcf2e TH |
306 | initiate_commit(data, how); |
307 | } | |
308 | } | |
309 | out: | |
f54bcf2e TH |
310 | return PNFS_ATTEMPTED; |
311 | } | |
312 | EXPORT_SYMBOL_GPL(pnfs_generic_commit_pagelist); | |
875ae069 PT |
313 | |
314 | /* | |
315 | * Data server cache | |
316 | * | |
317 | * Data servers can be mapped to different device ids. | |
318 | * nfs4_pnfs_ds reference counting | |
319 | * - set to 1 on allocation | |
320 | * - incremented when a device id maps a data server already in the cache. | |
321 | * - decremented when deviceid is removed from the cache. | |
322 | */ | |
323 | static DEFINE_SPINLOCK(nfs4_ds_cache_lock); | |
324 | static LIST_HEAD(nfs4_data_server_cache); | |
325 | ||
326 | /* Debug routines */ | |
327 | static void | |
328 | print_ds(struct nfs4_pnfs_ds *ds) | |
329 | { | |
330 | if (ds == NULL) { | |
331 | printk(KERN_WARNING "%s NULL device\n", __func__); | |
332 | return; | |
333 | } | |
334 | printk(KERN_WARNING " ds %s\n" | |
335 | " ref count %d\n" | |
336 | " client %p\n" | |
337 | " cl_exchange_flags %x\n", | |
338 | ds->ds_remotestr, | |
a2a5dea7 | 339 | refcount_read(&ds->ds_count), ds->ds_clp, |
875ae069 PT |
340 | ds->ds_clp ? ds->ds_clp->cl_exchange_flags : 0); |
341 | } | |
342 | ||
343 | static bool | |
344 | same_sockaddr(struct sockaddr *addr1, struct sockaddr *addr2) | |
345 | { | |
346 | struct sockaddr_in *a, *b; | |
347 | struct sockaddr_in6 *a6, *b6; | |
348 | ||
349 | if (addr1->sa_family != addr2->sa_family) | |
350 | return false; | |
351 | ||
352 | switch (addr1->sa_family) { | |
353 | case AF_INET: | |
354 | a = (struct sockaddr_in *)addr1; | |
355 | b = (struct sockaddr_in *)addr2; | |
356 | ||
357 | if (a->sin_addr.s_addr == b->sin_addr.s_addr && | |
358 | a->sin_port == b->sin_port) | |
359 | return true; | |
360 | break; | |
361 | ||
362 | case AF_INET6: | |
363 | a6 = (struct sockaddr_in6 *)addr1; | |
364 | b6 = (struct sockaddr_in6 *)addr2; | |
365 | ||
366 | /* LINKLOCAL addresses must have matching scope_id */ | |
367 | if (ipv6_addr_src_scope(&a6->sin6_addr) == | |
368 | IPV6_ADDR_SCOPE_LINKLOCAL && | |
369 | a6->sin6_scope_id != b6->sin6_scope_id) | |
370 | return false; | |
371 | ||
372 | if (ipv6_addr_equal(&a6->sin6_addr, &b6->sin6_addr) && | |
373 | a6->sin6_port == b6->sin6_port) | |
374 | return true; | |
375 | break; | |
376 | ||
377 | default: | |
378 | dprintk("%s: unhandled address family: %u\n", | |
379 | __func__, addr1->sa_family); | |
380 | return false; | |
381 | } | |
382 | ||
383 | return false; | |
384 | } | |
385 | ||
6f536936 TM |
386 | /* |
387 | * Checks if 'dsaddrs1' contains a subset of 'dsaddrs2'. If it does, | |
388 | * declare a match. | |
389 | */ | |
875ae069 PT |
390 | static bool |
391 | _same_data_server_addrs_locked(const struct list_head *dsaddrs1, | |
392 | const struct list_head *dsaddrs2) | |
393 | { | |
394 | struct nfs4_pnfs_ds_addr *da1, *da2; | |
6f536936 TM |
395 | struct sockaddr *sa1, *sa2; |
396 | bool match = false; | |
397 | ||
398 | list_for_each_entry(da1, dsaddrs1, da_node) { | |
399 | sa1 = (struct sockaddr *)&da1->da_addr; | |
400 | match = false; | |
401 | list_for_each_entry(da2, dsaddrs2, da_node) { | |
402 | sa2 = (struct sockaddr *)&da2->da_addr; | |
403 | match = same_sockaddr(sa1, sa2); | |
404 | if (match) | |
405 | break; | |
406 | } | |
407 | if (!match) | |
408 | break; | |
875ae069 | 409 | } |
6f536936 | 410 | return match; |
875ae069 PT |
411 | } |
412 | ||
413 | /* | |
414 | * Lookup DS by addresses. nfs4_ds_cache_lock is held | |
415 | */ | |
416 | static struct nfs4_pnfs_ds * | |
417 | _data_server_lookup_locked(const struct list_head *dsaddrs) | |
418 | { | |
419 | struct nfs4_pnfs_ds *ds; | |
420 | ||
421 | list_for_each_entry(ds, &nfs4_data_server_cache, ds_node) | |
422 | if (_same_data_server_addrs_locked(&ds->ds_addrs, dsaddrs)) | |
423 | return ds; | |
424 | return NULL; | |
425 | } | |
426 | ||
427 | static void destroy_ds(struct nfs4_pnfs_ds *ds) | |
428 | { | |
429 | struct nfs4_pnfs_ds_addr *da; | |
430 | ||
431 | dprintk("--> %s\n", __func__); | |
432 | ifdebug(FACILITY) | |
433 | print_ds(ds); | |
434 | ||
435 | nfs_put_client(ds->ds_clp); | |
436 | ||
437 | while (!list_empty(&ds->ds_addrs)) { | |
438 | da = list_first_entry(&ds->ds_addrs, | |
439 | struct nfs4_pnfs_ds_addr, | |
440 | da_node); | |
441 | list_del_init(&da->da_node); | |
442 | kfree(da->da_remotestr); | |
443 | kfree(da); | |
444 | } | |
445 | ||
446 | kfree(ds->ds_remotestr); | |
447 | kfree(ds); | |
448 | } | |
449 | ||
450 | void nfs4_pnfs_ds_put(struct nfs4_pnfs_ds *ds) | |
451 | { | |
a2a5dea7 | 452 | if (refcount_dec_and_lock(&ds->ds_count, |
875ae069 PT |
453 | &nfs4_ds_cache_lock)) { |
454 | list_del_init(&ds->ds_node); | |
455 | spin_unlock(&nfs4_ds_cache_lock); | |
456 | destroy_ds(ds); | |
457 | } | |
458 | } | |
459 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_put); | |
460 | ||
461 | /* | |
462 | * Create a string with a human readable address and port to avoid | |
463 | * complicated setup around many dprinks. | |
464 | */ | |
465 | static char * | |
466 | nfs4_pnfs_remotestr(struct list_head *dsaddrs, gfp_t gfp_flags) | |
467 | { | |
468 | struct nfs4_pnfs_ds_addr *da; | |
469 | char *remotestr; | |
470 | size_t len; | |
471 | char *p; | |
472 | ||
473 | len = 3; /* '{', '}' and eol */ | |
474 | list_for_each_entry(da, dsaddrs, da_node) { | |
475 | len += strlen(da->da_remotestr) + 1; /* string plus comma */ | |
476 | } | |
477 | ||
478 | remotestr = kzalloc(len, gfp_flags); | |
479 | if (!remotestr) | |
480 | return NULL; | |
481 | ||
482 | p = remotestr; | |
483 | *(p++) = '{'; | |
484 | len--; | |
485 | list_for_each_entry(da, dsaddrs, da_node) { | |
486 | size_t ll = strlen(da->da_remotestr); | |
487 | ||
488 | if (ll > len) | |
489 | goto out_err; | |
490 | ||
491 | memcpy(p, da->da_remotestr, ll); | |
492 | p += ll; | |
493 | len -= ll; | |
494 | ||
495 | if (len < 1) | |
496 | goto out_err; | |
497 | (*p++) = ','; | |
498 | len--; | |
499 | } | |
500 | if (len < 2) | |
501 | goto out_err; | |
502 | *(p++) = '}'; | |
503 | *p = '\0'; | |
504 | return remotestr; | |
505 | out_err: | |
506 | kfree(remotestr); | |
507 | return NULL; | |
508 | } | |
509 | ||
510 | /* | |
511 | * Given a list of multipath struct nfs4_pnfs_ds_addr, add it to ds cache if | |
512 | * uncached and return cached struct nfs4_pnfs_ds. | |
513 | */ | |
514 | struct nfs4_pnfs_ds * | |
515 | nfs4_pnfs_ds_add(struct list_head *dsaddrs, gfp_t gfp_flags) | |
516 | { | |
517 | struct nfs4_pnfs_ds *tmp_ds, *ds = NULL; | |
518 | char *remotestr; | |
519 | ||
520 | if (list_empty(dsaddrs)) { | |
521 | dprintk("%s: no addresses defined\n", __func__); | |
522 | goto out; | |
523 | } | |
524 | ||
525 | ds = kzalloc(sizeof(*ds), gfp_flags); | |
526 | if (!ds) | |
527 | goto out; | |
528 | ||
529 | /* this is only used for debugging, so it's ok if its NULL */ | |
530 | remotestr = nfs4_pnfs_remotestr(dsaddrs, gfp_flags); | |
531 | ||
532 | spin_lock(&nfs4_ds_cache_lock); | |
533 | tmp_ds = _data_server_lookup_locked(dsaddrs); | |
534 | if (tmp_ds == NULL) { | |
535 | INIT_LIST_HEAD(&ds->ds_addrs); | |
536 | list_splice_init(dsaddrs, &ds->ds_addrs); | |
537 | ds->ds_remotestr = remotestr; | |
a2a5dea7 | 538 | refcount_set(&ds->ds_count, 1); |
875ae069 PT |
539 | INIT_LIST_HEAD(&ds->ds_node); |
540 | ds->ds_clp = NULL; | |
541 | list_add(&ds->ds_node, &nfs4_data_server_cache); | |
542 | dprintk("%s add new data server %s\n", __func__, | |
543 | ds->ds_remotestr); | |
544 | } else { | |
545 | kfree(remotestr); | |
546 | kfree(ds); | |
a2a5dea7 | 547 | refcount_inc(&tmp_ds->ds_count); |
875ae069 PT |
548 | dprintk("%s data server %s found, inc'ed ds_count to %d\n", |
549 | __func__, tmp_ds->ds_remotestr, | |
a2a5dea7 | 550 | refcount_read(&tmp_ds->ds_count)); |
875ae069 PT |
551 | ds = tmp_ds; |
552 | } | |
553 | spin_unlock(&nfs4_ds_cache_lock); | |
554 | out: | |
555 | return ds; | |
556 | } | |
557 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_add); | |
6b7f3cf9 | 558 | |
7405f9e1 PT |
559 | static void nfs4_wait_ds_connect(struct nfs4_pnfs_ds *ds) |
560 | { | |
561 | might_sleep(); | |
562 | wait_on_bit(&ds->ds_state, NFS4DS_CONNECTING, | |
563 | TASK_KILLABLE); | |
564 | } | |
565 | ||
566 | static void nfs4_clear_ds_conn_bit(struct nfs4_pnfs_ds *ds) | |
567 | { | |
568 | smp_mb__before_atomic(); | |
569 | clear_bit(NFS4DS_CONNECTING, &ds->ds_state); | |
570 | smp_mb__after_atomic(); | |
571 | wake_up_bit(&ds->ds_state, NFS4DS_CONNECTING); | |
572 | } | |
573 | ||
5f01d953 | 574 | static struct nfs_client *(*get_v3_ds_connect)( |
b224f7cb | 575 | struct nfs_server *mds_srv, |
5f01d953 PT |
576 | const struct sockaddr *ds_addr, |
577 | int ds_addrlen, | |
578 | int ds_proto, | |
579 | unsigned int ds_timeo, | |
7d38de3f | 580 | unsigned int ds_retrans); |
5f01d953 PT |
581 | |
582 | static bool load_v3_ds_connect(void) | |
583 | { | |
584 | if (!get_v3_ds_connect) { | |
585 | get_v3_ds_connect = symbol_request(nfs3_set_ds_client); | |
586 | WARN_ON_ONCE(!get_v3_ds_connect); | |
587 | } | |
588 | ||
589 | return(get_v3_ds_connect != NULL); | |
590 | } | |
591 | ||
df137bc1 | 592 | void nfs4_pnfs_v3_ds_connect_unload(void) |
5f01d953 PT |
593 | { |
594 | if (get_v3_ds_connect) { | |
595 | symbol_put(nfs3_set_ds_client); | |
596 | get_v3_ds_connect = NULL; | |
597 | } | |
598 | } | |
5f01d953 PT |
599 | |
600 | static int _nfs4_pnfs_v3_ds_connect(struct nfs_server *mds_srv, | |
601 | struct nfs4_pnfs_ds *ds, | |
602 | unsigned int timeo, | |
7d38de3f | 603 | unsigned int retrans) |
5f01d953 PT |
604 | { |
605 | struct nfs_client *clp = ERR_PTR(-EIO); | |
606 | struct nfs4_pnfs_ds_addr *da; | |
607 | int status = 0; | |
608 | ||
7d38de3f | 609 | dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); |
5f01d953 PT |
610 | |
611 | if (!load_v3_ds_connect()) | |
612 | goto out; | |
613 | ||
614 | list_for_each_entry(da, &ds->ds_addrs, da_node) { | |
615 | dprintk("%s: DS %s: trying address %s\n", | |
616 | __func__, ds->ds_remotestr, da->da_remotestr); | |
617 | ||
fc821d59 TM |
618 | if (!IS_ERR(clp)) { |
619 | struct xprt_create xprt_args = { | |
620 | .ident = XPRT_TRANSPORT_TCP, | |
621 | .net = clp->cl_net, | |
622 | .dstaddr = (struct sockaddr *)&da->da_addr, | |
623 | .addrlen = da->da_addrlen, | |
624 | .servername = clp->cl_hostname, | |
625 | }; | |
626 | /* Add this address as an alias */ | |
627 | rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, | |
628 | rpc_clnt_test_and_add_xprt, NULL); | |
629 | } else | |
b224f7cb | 630 | clp = get_v3_ds_connect(mds_srv, |
5f01d953 PT |
631 | (struct sockaddr *)&da->da_addr, |
632 | da->da_addrlen, IPPROTO_TCP, | |
7d38de3f | 633 | timeo, retrans); |
5f01d953 PT |
634 | } |
635 | ||
636 | if (IS_ERR(clp)) { | |
637 | status = PTR_ERR(clp); | |
638 | goto out; | |
639 | } | |
640 | ||
641 | smp_wmb(); | |
642 | ds->ds_clp = clp; | |
643 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); | |
644 | out: | |
645 | return status; | |
646 | } | |
647 | ||
648 | static int _nfs4_pnfs_v4_ds_connect(struct nfs_server *mds_srv, | |
7405f9e1 PT |
649 | struct nfs4_pnfs_ds *ds, |
650 | unsigned int timeo, | |
064172f3 | 651 | unsigned int retrans, |
7d38de3f | 652 | u32 minor_version) |
7405f9e1 PT |
653 | { |
654 | struct nfs_client *clp = ERR_PTR(-EIO); | |
655 | struct nfs4_pnfs_ds_addr *da; | |
656 | int status = 0; | |
657 | ||
7d38de3f | 658 | dprintk("--> %s DS %s\n", __func__, ds->ds_remotestr); |
7405f9e1 PT |
659 | |
660 | list_for_each_entry(da, &ds->ds_addrs, da_node) { | |
661 | dprintk("%s: DS %s: trying address %s\n", | |
662 | __func__, ds->ds_remotestr, da->da_remotestr); | |
663 | ||
04fa2c6b AA |
664 | if (!IS_ERR(clp) && clp->cl_mvops->session_trunk) { |
665 | struct xprt_create xprt_args = { | |
666 | .ident = XPRT_TRANSPORT_TCP, | |
667 | .net = clp->cl_net, | |
668 | .dstaddr = (struct sockaddr *)&da->da_addr, | |
669 | .addrlen = da->da_addrlen, | |
670 | .servername = clp->cl_hostname, | |
671 | }; | |
672 | struct nfs4_add_xprt_data xprtdata = { | |
673 | .clp = clp, | |
674 | .cred = nfs4_get_clid_cred(clp), | |
675 | }; | |
676 | struct rpc_add_xprt_test rpcdata = { | |
677 | .add_xprt_test = clp->cl_mvops->session_trunk, | |
678 | .data = &xprtdata, | |
679 | }; | |
680 | ||
681 | /** | |
682 | * Test this address for session trunking and | |
683 | * add as an alias | |
684 | */ | |
685 | rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args, | |
686 | rpc_clnt_setup_test_and_add_xprt, | |
687 | &rpcdata); | |
688 | if (xprtdata.cred) | |
689 | put_rpccred(xprtdata.cred); | |
690 | } else { | |
691 | clp = nfs4_set_ds_client(mds_srv, | |
692 | (struct sockaddr *)&da->da_addr, | |
693 | da->da_addrlen, IPPROTO_TCP, | |
7d38de3f | 694 | timeo, retrans, minor_version); |
04fa2c6b AA |
695 | if (IS_ERR(clp)) |
696 | continue; | |
697 | ||
698 | status = nfs4_init_ds_session(clp, | |
699 | mds_srv->nfs_client->cl_lease_time); | |
700 | if (status) { | |
701 | nfs_put_client(clp); | |
702 | clp = ERR_PTR(-EIO); | |
703 | continue; | |
704 | } | |
705 | ||
706 | } | |
7405f9e1 PT |
707 | } |
708 | ||
709 | if (IS_ERR(clp)) { | |
710 | status = PTR_ERR(clp); | |
711 | goto out; | |
712 | } | |
713 | ||
7405f9e1 PT |
714 | smp_wmb(); |
715 | ds->ds_clp = clp; | |
716 | dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr); | |
717 | out: | |
718 | return status; | |
7405f9e1 PT |
719 | } |
720 | ||
721 | /* | |
722 | * Create an rpc connection to the nfs4_pnfs_ds data server. | |
723 | * Currently only supports IPv4 and IPv6 addresses. | |
a33e4b03 | 724 | * If connection fails, make devid unavailable and return a -errno. |
7405f9e1 | 725 | */ |
a33e4b03 | 726 | int nfs4_pnfs_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds, |
7405f9e1 | 727 | struct nfs4_deviceid_node *devid, unsigned int timeo, |
7d38de3f | 728 | unsigned int retrans, u32 version, u32 minor_version) |
7405f9e1 | 729 | { |
da066f3f | 730 | int err; |
7405f9e1 | 731 | |
da066f3f WAA |
732 | again: |
733 | err = 0; | |
734 | if (test_and_set_bit(NFS4DS_CONNECTING, &ds->ds_state) == 0) { | |
5f01d953 PT |
735 | if (version == 3) { |
736 | err = _nfs4_pnfs_v3_ds_connect(mds_srv, ds, timeo, | |
7d38de3f | 737 | retrans); |
5f01d953 PT |
738 | } else if (version == 4) { |
739 | err = _nfs4_pnfs_v4_ds_connect(mds_srv, ds, timeo, | |
7d38de3f | 740 | retrans, minor_version); |
5f01d953 PT |
741 | } else { |
742 | dprintk("%s: unsupported DS version %d\n", __func__, | |
743 | version); | |
744 | err = -EPROTONOSUPPORT; | |
745 | } | |
746 | ||
7405f9e1 PT |
747 | nfs4_clear_ds_conn_bit(ds); |
748 | } else { | |
749 | nfs4_wait_ds_connect(ds); | |
da066f3f WAA |
750 | |
751 | /* what was waited on didn't connect AND didn't mark unavail */ | |
752 | if (!ds->ds_clp && !nfs4_test_deviceid_unavailable(devid)) | |
753 | goto again; | |
7405f9e1 | 754 | } |
a33e4b03 WAA |
755 | |
756 | /* | |
757 | * At this point the ds->ds_clp should be ready, but it might have | |
758 | * hit an error. | |
759 | */ | |
da066f3f WAA |
760 | if (!err) { |
761 | if (!ds->ds_clp || !nfs_client_init_is_complete(ds->ds_clp)) { | |
762 | WARN_ON_ONCE(ds->ds_clp || | |
763 | !nfs4_test_deviceid_unavailable(devid)); | |
764 | return -EINVAL; | |
765 | } | |
766 | err = nfs_client_init_status(ds->ds_clp); | |
a33e4b03 WAA |
767 | } |
768 | ||
da066f3f | 769 | return err; |
7405f9e1 PT |
770 | } |
771 | EXPORT_SYMBOL_GPL(nfs4_pnfs_ds_connect); | |
772 | ||
6b7f3cf9 PT |
773 | /* |
774 | * Currently only supports ipv4, ipv6 and one multi-path address. | |
775 | */ | |
776 | struct nfs4_pnfs_ds_addr * | |
777 | nfs4_decode_mp_ds_addr(struct net *net, struct xdr_stream *xdr, gfp_t gfp_flags) | |
778 | { | |
779 | struct nfs4_pnfs_ds_addr *da = NULL; | |
780 | char *buf, *portstr; | |
781 | __be16 port; | |
782 | int nlen, rlen; | |
783 | int tmp[2]; | |
784 | __be32 *p; | |
785 | char *netid, *match_netid; | |
786 | size_t len, match_netid_len; | |
787 | char *startsep = ""; | |
788 | char *endsep = ""; | |
789 | ||
790 | ||
791 | /* r_netid */ | |
792 | p = xdr_inline_decode(xdr, 4); | |
793 | if (unlikely(!p)) | |
794 | goto out_err; | |
795 | nlen = be32_to_cpup(p++); | |
796 | ||
797 | p = xdr_inline_decode(xdr, nlen); | |
798 | if (unlikely(!p)) | |
799 | goto out_err; | |
800 | ||
801 | netid = kmalloc(nlen+1, gfp_flags); | |
802 | if (unlikely(!netid)) | |
803 | goto out_err; | |
804 | ||
805 | netid[nlen] = '\0'; | |
806 | memcpy(netid, p, nlen); | |
807 | ||
808 | /* r_addr: ip/ip6addr with port in dec octets - see RFC 5665 */ | |
809 | p = xdr_inline_decode(xdr, 4); | |
810 | if (unlikely(!p)) | |
811 | goto out_free_netid; | |
812 | rlen = be32_to_cpup(p); | |
813 | ||
814 | p = xdr_inline_decode(xdr, rlen); | |
815 | if (unlikely(!p)) | |
816 | goto out_free_netid; | |
817 | ||
818 | /* port is ".ABC.DEF", 8 chars max */ | |
819 | if (rlen > INET6_ADDRSTRLEN + IPV6_SCOPE_ID_LEN + 8) { | |
820 | dprintk("%s: Invalid address, length %d\n", __func__, | |
821 | rlen); | |
822 | goto out_free_netid; | |
823 | } | |
824 | buf = kmalloc(rlen + 1, gfp_flags); | |
825 | if (!buf) { | |
826 | dprintk("%s: Not enough memory\n", __func__); | |
827 | goto out_free_netid; | |
828 | } | |
829 | buf[rlen] = '\0'; | |
830 | memcpy(buf, p, rlen); | |
831 | ||
832 | /* replace port '.' with '-' */ | |
833 | portstr = strrchr(buf, '.'); | |
834 | if (!portstr) { | |
835 | dprintk("%s: Failed finding expected dot in port\n", | |
836 | __func__); | |
837 | goto out_free_buf; | |
838 | } | |
839 | *portstr = '-'; | |
840 | ||
841 | /* find '.' between address and port */ | |
842 | portstr = strrchr(buf, '.'); | |
843 | if (!portstr) { | |
844 | dprintk("%s: Failed finding expected dot between address and " | |
845 | "port\n", __func__); | |
846 | goto out_free_buf; | |
847 | } | |
848 | *portstr = '\0'; | |
849 | ||
850 | da = kzalloc(sizeof(*da), gfp_flags); | |
851 | if (unlikely(!da)) | |
852 | goto out_free_buf; | |
853 | ||
854 | INIT_LIST_HEAD(&da->da_node); | |
855 | ||
856 | if (!rpc_pton(net, buf, portstr-buf, (struct sockaddr *)&da->da_addr, | |
857 | sizeof(da->da_addr))) { | |
858 | dprintk("%s: error parsing address %s\n", __func__, buf); | |
859 | goto out_free_da; | |
860 | } | |
861 | ||
862 | portstr++; | |
863 | sscanf(portstr, "%d-%d", &tmp[0], &tmp[1]); | |
864 | port = htons((tmp[0] << 8) | (tmp[1])); | |
865 | ||
866 | switch (da->da_addr.ss_family) { | |
867 | case AF_INET: | |
868 | ((struct sockaddr_in *)&da->da_addr)->sin_port = port; | |
869 | da->da_addrlen = sizeof(struct sockaddr_in); | |
870 | match_netid = "tcp"; | |
871 | match_netid_len = 3; | |
872 | break; | |
873 | ||
874 | case AF_INET6: | |
875 | ((struct sockaddr_in6 *)&da->da_addr)->sin6_port = port; | |
876 | da->da_addrlen = sizeof(struct sockaddr_in6); | |
877 | match_netid = "tcp6"; | |
878 | match_netid_len = 4; | |
879 | startsep = "["; | |
880 | endsep = "]"; | |
881 | break; | |
882 | ||
883 | default: | |
884 | dprintk("%s: unsupported address family: %u\n", | |
885 | __func__, da->da_addr.ss_family); | |
886 | goto out_free_da; | |
887 | } | |
888 | ||
889 | if (nlen != match_netid_len || strncmp(netid, match_netid, nlen)) { | |
890 | dprintk("%s: ERROR: r_netid \"%s\" != \"%s\"\n", | |
891 | __func__, netid, match_netid); | |
892 | goto out_free_da; | |
893 | } | |
894 | ||
895 | /* save human readable address */ | |
896 | len = strlen(startsep) + strlen(buf) + strlen(endsep) + 7; | |
897 | da->da_remotestr = kzalloc(len, gfp_flags); | |
898 | ||
899 | /* NULL is ok, only used for dprintk */ | |
900 | if (da->da_remotestr) | |
901 | snprintf(da->da_remotestr, len, "%s%s%s:%u", startsep, | |
902 | buf, endsep, ntohs(port)); | |
903 | ||
904 | dprintk("%s: Parsed DS addr %s\n", __func__, da->da_remotestr); | |
905 | kfree(buf); | |
906 | kfree(netid); | |
907 | return da; | |
908 | ||
909 | out_free_da: | |
910 | kfree(da); | |
911 | out_free_buf: | |
912 | dprintk("%s: Error parsing DS addr: %s\n", __func__, buf); | |
913 | kfree(buf); | |
914 | out_free_netid: | |
915 | kfree(netid); | |
916 | out_err: | |
917 | return NULL; | |
918 | } | |
919 | EXPORT_SYMBOL_GPL(nfs4_decode_mp_ds_addr); | |
338d00cf TH |
920 | |
921 | void | |
922 | pnfs_layout_mark_request_commit(struct nfs_page *req, | |
923 | struct pnfs_layout_segment *lseg, | |
924 | struct nfs_commit_info *cinfo, | |
925 | u32 ds_commit_idx) | |
926 | { | |
927 | struct list_head *list; | |
928 | struct pnfs_commit_bucket *buckets; | |
929 | ||
e824f99a | 930 | mutex_lock(&NFS_I(cinfo->inode)->commit_mutex); |
338d00cf TH |
931 | buckets = cinfo->ds->buckets; |
932 | list = &buckets[ds_commit_idx].written; | |
933 | if (list_empty(list)) { | |
b20135d0 | 934 | if (!pnfs_is_valid_lseg(lseg)) { |
e824f99a | 935 | mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); |
b20135d0 TM |
936 | cinfo->completion_ops->resched_write(cinfo, req); |
937 | return; | |
938 | } | |
338d00cf TH |
939 | /* Non-empty buckets hold a reference on the lseg. That ref |
940 | * is normally transferred to the COMMIT call and released | |
941 | * there. It could also be released if the last req is pulled | |
942 | * off due to a rewrite, in which case it will be done in | |
943 | * pnfs_common_clear_request_commit | |
944 | */ | |
945 | WARN_ON_ONCE(buckets[ds_commit_idx].wlseg != NULL); | |
946 | buckets[ds_commit_idx].wlseg = pnfs_get_lseg(lseg); | |
947 | } | |
948 | set_bit(PG_COMMIT_TO_DS, &req->wb_flags); | |
949 | cinfo->ds->nwritten++; | |
338d00cf | 950 | |
86d80f97 | 951 | nfs_request_add_commit_list_locked(req, list, cinfo); |
e824f99a | 952 | mutex_unlock(&NFS_I(cinfo->inode)->commit_mutex); |
86d80f97 | 953 | nfs_mark_page_unstable(req->wb_page, cinfo); |
338d00cf TH |
954 | } |
955 | EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit); | |
5bb89b47 TM |
956 | |
957 | int | |
958 | pnfs_nfs_generic_sync(struct inode *inode, bool datasync) | |
959 | { | |
2e18d4d8 TM |
960 | int ret; |
961 | ||
962 | if (!pnfs_layoutcommit_outstanding(inode)) | |
963 | return 0; | |
964 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
965 | if (ret < 0) | |
966 | return ret; | |
5bb89b47 TM |
967 | if (datasync) |
968 | return 0; | |
969 | return pnfs_layoutcommit_inode(inode, true); | |
970 | } | |
971 | EXPORT_SYMBOL_GPL(pnfs_nfs_generic_sync); | |
972 |