Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * linux/fs/nfs/pagelist.c | |
4 | * | |
5 | * A set of helper functions for managing NFS read and write requests. | |
6 | * The main purpose of these routines is to provide support for the | |
7 | * coalescing of several requests into a single RPC call. | |
8 | * | |
9 | * Copyright 2000, 2001 (c) Trond Myklebust <trond.myklebust@fys.uio.no> | |
10 | * | |
11 | */ | |
12 | ||
1da177e4 LT |
13 | #include <linux/slab.h> |
14 | #include <linux/file.h> | |
e8edc6e0 | 15 | #include <linux/sched.h> |
1da177e4 | 16 | #include <linux/sunrpc/clnt.h> |
1313e603 | 17 | #include <linux/nfs.h> |
1da177e4 LT |
18 | #include <linux/nfs3.h> |
19 | #include <linux/nfs4.h> | |
1da177e4 | 20 | #include <linux/nfs_fs.h> |
33344e0f | 21 | #include <linux/nfs_page.h> |
1da177e4 | 22 | #include <linux/nfs_mount.h> |
afeacc8c | 23 | #include <linux/export.h> |
5970e15d | 24 | #include <linux/filelock.h> |
1da177e4 | 25 | |
8d5658c9 | 26 | #include "internal.h" |
bae724ef | 27 | #include "pnfs.h" |
cd2ed9bd | 28 | #include "nfstrace.h" |
000dbe0b | 29 | #include "fscache.h" |
8d5658c9 | 30 | |
0eecb214 AS |
31 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
32 | ||
e18b890b | 33 | static struct kmem_cache *nfs_page_cachep; |
ef2c488c | 34 | static const struct rpc_call_ops nfs_pgio_common_ops; |
1da177e4 | 35 | |
eb9f2a5a TM |
36 | struct nfs_page_iter_page { |
37 | const struct nfs_page *req; | |
38 | size_t count; | |
39 | }; | |
40 | ||
41 | static void nfs_page_iter_page_init(struct nfs_page_iter_page *i, | |
42 | const struct nfs_page *req) | |
43 | { | |
44 | i->req = req; | |
45 | i->count = 0; | |
46 | } | |
47 | ||
48 | static void nfs_page_iter_page_advance(struct nfs_page_iter_page *i, size_t sz) | |
49 | { | |
50 | const struct nfs_page *req = i->req; | |
51 | size_t tmp = i->count + sz; | |
52 | ||
53 | i->count = (tmp < req->wb_bytes) ? tmp : req->wb_bytes; | |
54 | } | |
55 | ||
56 | static struct page *nfs_page_iter_page_get(struct nfs_page_iter_page *i) | |
57 | { | |
58 | const struct nfs_page *req = i->req; | |
59 | struct page *page; | |
60 | ||
61 | if (i->count != req->wb_bytes) { | |
62 | size_t base = i->count + req->wb_pgbase; | |
63 | size_t len = PAGE_SIZE - offset_in_page(base); | |
64 | ||
65 | page = nfs_page_to_page(req, base); | |
66 | nfs_page_iter_page_advance(i, len); | |
67 | return page; | |
68 | } | |
69 | return NULL; | |
70 | } | |
71 | ||
63e2fffa TM |
72 | static struct nfs_pgio_mirror * |
73 | nfs_pgio_get_mirror(struct nfs_pageio_descriptor *desc, u32 idx) | |
74 | { | |
75 | if (desc->pg_ops->pg_get_mirror) | |
76 | return desc->pg_ops->pg_get_mirror(desc, idx); | |
77 | return &desc->pg_mirrors[0]; | |
78 | } | |
79 | ||
48d635f1 PT |
80 | struct nfs_pgio_mirror * |
81 | nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc) | |
82 | { | |
63e2fffa | 83 | return nfs_pgio_get_mirror(desc, desc->pg_mirror_idx); |
48d635f1 PT |
84 | } |
85 | EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror); | |
86 | ||
63e2fffa TM |
87 | static u32 |
88 | nfs_pgio_set_current_mirror(struct nfs_pageio_descriptor *desc, u32 idx) | |
89 | { | |
90 | if (desc->pg_ops->pg_set_mirror) | |
91 | return desc->pg_ops->pg_set_mirror(desc, idx); | |
92 | return desc->pg_mirror_idx; | |
93 | } | |
94 | ||
4db6e0b7 FI |
95 | void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, |
96 | struct nfs_pgio_header *hdr, | |
97 | void (*release)(struct nfs_pgio_header *hdr)) | |
98 | { | |
48d635f1 | 99 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb WAA |
100 | |
101 | ||
102 | hdr->req = nfs_list_entry(mirror->pg_list.next); | |
4db6e0b7 | 103 | hdr->inode = desc->pg_inode; |
9fcd5960 | 104 | hdr->cred = nfs_req_openctx(hdr->req)->cred; |
4db6e0b7 | 105 | hdr->io_start = req_offset(hdr->req); |
a7d42ddb | 106 | hdr->good_bytes = mirror->pg_count; |
919e3bd9 | 107 | hdr->io_completion = desc->pg_io_completion; |
584aa810 | 108 | hdr->dreq = desc->pg_dreq; |
000dbe0b | 109 | nfs_netfs_set_pgio_header(hdr, desc); |
4db6e0b7 | 110 | hdr->release = release; |
061ae2ed | 111 | hdr->completion_ops = desc->pg_completion_ops; |
584aa810 FI |
112 | if (hdr->completion_ops->init_hdr) |
113 | hdr->completion_ops->init_hdr(hdr); | |
a7d42ddb WAA |
114 | |
115 | hdr->pgio_mirror_idx = desc->pg_mirror_idx; | |
4db6e0b7 | 116 | } |
89d77c8f | 117 | EXPORT_SYMBOL_GPL(nfs_pgheader_init); |
4db6e0b7 FI |
118 | |
119 | void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos) | |
120 | { | |
1c6c4b74 TM |
121 | unsigned int new = pos - hdr->io_start; |
122 | ||
cd2ed9bd | 123 | trace_nfs_pgio_error(hdr, error, pos); |
1c6c4b74 TM |
124 | if (hdr->good_bytes > new) { |
125 | hdr->good_bytes = new; | |
4db6e0b7 | 126 | clear_bit(NFS_IOHDR_EOF, &hdr->flags); |
1c6c4b74 TM |
127 | if (!test_and_set_bit(NFS_IOHDR_ERROR, &hdr->flags)) |
128 | hdr->error = error; | |
4db6e0b7 | 129 | } |
4db6e0b7 FI |
130 | } |
131 | ||
0bae835b | 132 | static inline struct nfs_page *nfs_page_alloc(void) |
1da177e4 | 133 | { |
0bae835b TM |
134 | struct nfs_page *p = |
135 | kmem_cache_zalloc(nfs_page_cachep, nfs_io_gfp_mask()); | |
72895b1a | 136 | if (p) |
1da177e4 | 137 | INIT_LIST_HEAD(&p->wb_list); |
1da177e4 LT |
138 | return p; |
139 | } | |
140 | ||
141 | static inline void | |
142 | nfs_page_free(struct nfs_page *p) | |
143 | { | |
144 | kmem_cache_free(nfs_page_cachep, p); | |
145 | } | |
146 | ||
577b4232 TM |
147 | /** |
148 | * nfs_iocounter_wait - wait for i/o to complete | |
210c7c17 | 149 | * @l_ctx: nfs_lock_context with io_counter to use |
577b4232 TM |
150 | * |
151 | * returns -ERESTARTSYS if interrupted by a fatal signal. | |
152 | * Otherwise returns 0 once the io_count hits 0. | |
153 | */ | |
154 | int | |
210c7c17 | 155 | nfs_iocounter_wait(struct nfs_lock_context *l_ctx) |
577b4232 | 156 | { |
723c921e PZ |
157 | return wait_var_event_killable(&l_ctx->io_count, |
158 | !atomic_read(&l_ctx->io_count)); | |
577b4232 TM |
159 | } |
160 | ||
7d6ddf88 BC |
161 | /** |
162 | * nfs_async_iocounter_wait - wait on a rpc_waitqueue for I/O | |
163 | * to complete | |
164 | * @task: the rpc_task that should wait | |
165 | * @l_ctx: nfs_lock_context with io_counter to check | |
166 | * | |
167 | * Returns true if there is outstanding I/O to wait on and the | |
168 | * task has been put to sleep. | |
169 | */ | |
170 | bool | |
171 | nfs_async_iocounter_wait(struct rpc_task *task, struct nfs_lock_context *l_ctx) | |
172 | { | |
173 | struct inode *inode = d_inode(l_ctx->open_context->dentry); | |
174 | bool ret = false; | |
175 | ||
176 | if (atomic_read(&l_ctx->io_count) > 0) { | |
177 | rpc_sleep_on(&NFS_SERVER(inode)->uoc_rpcwaitq, task, NULL); | |
178 | ret = true; | |
179 | } | |
180 | ||
181 | if (atomic_read(&l_ctx->io_count) == 0) { | |
182 | rpc_wake_up_queued_task(&NFS_SERVER(inode)->uoc_rpcwaitq, task); | |
183 | ret = false; | |
184 | } | |
185 | ||
186 | return ret; | |
187 | } | |
188 | EXPORT_SYMBOL_GPL(nfs_async_iocounter_wait); | |
189 | ||
e00ed89d TM |
190 | /* |
191 | * nfs_page_lock_head_request - page lock the head of the page group | |
192 | * @req: any member of the page group | |
193 | */ | |
194 | struct nfs_page * | |
195 | nfs_page_group_lock_head(struct nfs_page *req) | |
196 | { | |
197 | struct nfs_page *head = req->wb_head; | |
198 | ||
199 | while (!nfs_lock_request(head)) { | |
200 | int ret = nfs_wait_on_request(head); | |
201 | if (ret < 0) | |
202 | return ERR_PTR(ret); | |
203 | } | |
204 | if (head != req) | |
205 | kref_get(&head->wb_kref); | |
206 | return head; | |
207 | } | |
208 | ||
a62f8e3b TM |
209 | /* |
210 | * nfs_unroll_locks - unlock all newly locked reqs and wait on @req | |
211 | * @head: head request of page group, must be holding head lock | |
212 | * @req: request that couldn't lock and needs to wait on the req bit lock | |
213 | * | |
214 | * This is a helper function for nfs_lock_and_join_requests | |
215 | * returns 0 on success, < 0 on error. | |
216 | */ | |
217 | static void | |
218 | nfs_unroll_locks(struct nfs_page *head, struct nfs_page *req) | |
219 | { | |
220 | struct nfs_page *tmp; | |
221 | ||
222 | /* relinquish all the locks successfully grabbed this run */ | |
223 | for (tmp = head->wb_this_page ; tmp != req; tmp = tmp->wb_this_page) { | |
224 | if (!kref_read(&tmp->wb_kref)) | |
225 | continue; | |
226 | nfs_unlock_and_release_request(tmp); | |
227 | } | |
228 | } | |
229 | ||
230 | /* | |
231 | * nfs_page_group_lock_subreq - try to lock a subrequest | |
232 | * @head: head request of page group | |
233 | * @subreq: request to lock | |
234 | * | |
235 | * This is a helper function for nfs_lock_and_join_requests which | |
236 | * must be called with the head request and page group both locked. | |
237 | * On error, it returns with the page group unlocked. | |
238 | */ | |
239 | static int | |
240 | nfs_page_group_lock_subreq(struct nfs_page *head, struct nfs_page *subreq) | |
241 | { | |
242 | int ret; | |
243 | ||
244 | if (!kref_get_unless_zero(&subreq->wb_kref)) | |
245 | return 0; | |
246 | while (!nfs_lock_request(subreq)) { | |
247 | nfs_page_group_unlock(head); | |
248 | ret = nfs_wait_on_request(subreq); | |
249 | if (!ret) | |
250 | ret = nfs_page_group_lock(head); | |
251 | if (ret < 0) { | |
252 | nfs_unroll_locks(head, subreq); | |
253 | nfs_release_request(subreq); | |
254 | return ret; | |
255 | } | |
256 | } | |
257 | return 0; | |
258 | } | |
259 | ||
260 | /* | |
261 | * nfs_page_group_lock_subrequests - try to lock the subrequests | |
262 | * @head: head request of page group | |
263 | * | |
264 | * This is a helper function for nfs_lock_and_join_requests which | |
e00ed89d | 265 | * must be called with the head request locked. |
a62f8e3b TM |
266 | */ |
267 | int nfs_page_group_lock_subrequests(struct nfs_page *head) | |
268 | { | |
269 | struct nfs_page *subreq; | |
270 | int ret; | |
271 | ||
e00ed89d TM |
272 | ret = nfs_page_group_lock(head); |
273 | if (ret < 0) | |
274 | return ret; | |
a62f8e3b TM |
275 | /* lock each request in the page group */ |
276 | for (subreq = head->wb_this_page; subreq != head; | |
277 | subreq = subreq->wb_this_page) { | |
278 | ret = nfs_page_group_lock_subreq(head, subreq); | |
279 | if (ret < 0) | |
280 | return ret; | |
281 | } | |
e00ed89d | 282 | nfs_page_group_unlock(head); |
a62f8e3b TM |
283 | return 0; |
284 | } | |
285 | ||
2bfc6e56 | 286 | /* |
08ca8b21 TM |
287 | * nfs_page_set_headlock - set the request PG_HEADLOCK |
288 | * @req: request that is to be locked | |
2bfc6e56 | 289 | * |
08ca8b21 | 290 | * this lock must be held when modifying req->wb_head |
e7029206 | 291 | * |
1344b7ea | 292 | * return 0 on success, < 0 on error |
2bfc6e56 | 293 | */ |
e7029206 | 294 | int |
08ca8b21 | 295 | nfs_page_set_headlock(struct nfs_page *req) |
2bfc6e56 | 296 | { |
08ca8b21 | 297 | if (!test_and_set_bit(PG_HEADLOCK, &req->wb_flags)) |
bc8a309e | 298 | return 0; |
e7029206 | 299 | |
08ca8b21 | 300 | set_bit(PG_CONTENDED1, &req->wb_flags); |
1344b7ea | 301 | smp_mb__after_atomic(); |
08ca8b21 | 302 | return wait_on_bit_lock(&req->wb_flags, PG_HEADLOCK, |
bc8a309e | 303 | TASK_UNINTERRUPTIBLE); |
2bfc6e56 WAA |
304 | } |
305 | ||
306 | /* | |
08ca8b21 TM |
307 | * nfs_page_clear_headlock - clear the request PG_HEADLOCK |
308 | * @req: request that is to be locked | |
2bfc6e56 WAA |
309 | */ |
310 | void | |
08ca8b21 | 311 | nfs_page_clear_headlock(struct nfs_page *req) |
2bfc6e56 | 312 | { |
43d20e80 | 313 | clear_bit_unlock(PG_HEADLOCK, &req->wb_flags); |
d1e1cda8 | 314 | smp_mb__after_atomic(); |
08ca8b21 | 315 | if (!test_bit(PG_CONTENDED1, &req->wb_flags)) |
b4f937cf | 316 | return; |
08ca8b21 TM |
317 | wake_up_bit(&req->wb_flags, PG_HEADLOCK); |
318 | } | |
319 | ||
320 | /* | |
321 | * nfs_page_group_lock - lock the head of the page group | |
322 | * @req: request in group that is to be locked | |
323 | * | |
324 | * this lock must be held when traversing or modifying the page | |
325 | * group list | |
326 | * | |
327 | * return 0 on success, < 0 on error | |
328 | */ | |
329 | int | |
330 | nfs_page_group_lock(struct nfs_page *req) | |
331 | { | |
332 | int ret; | |
333 | ||
334 | ret = nfs_page_set_headlock(req); | |
335 | if (ret || req->wb_head == req) | |
336 | return ret; | |
337 | return nfs_page_set_headlock(req->wb_head); | |
338 | } | |
339 | ||
340 | /* | |
341 | * nfs_page_group_unlock - unlock the head of the page group | |
342 | * @req: request in group that is to be unlocked | |
343 | */ | |
344 | void | |
345 | nfs_page_group_unlock(struct nfs_page *req) | |
346 | { | |
347 | if (req != req->wb_head) | |
348 | nfs_page_clear_headlock(req->wb_head); | |
349 | nfs_page_clear_headlock(req); | |
2bfc6e56 WAA |
350 | } |
351 | ||
352 | /* | |
353 | * nfs_page_group_sync_on_bit_locked | |
354 | * | |
355 | * must be called with page group lock held | |
356 | */ | |
357 | static bool | |
358 | nfs_page_group_sync_on_bit_locked(struct nfs_page *req, unsigned int bit) | |
359 | { | |
360 | struct nfs_page *head = req->wb_head; | |
361 | struct nfs_page *tmp; | |
362 | ||
363 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_flags)); | |
364 | WARN_ON_ONCE(test_and_set_bit(bit, &req->wb_flags)); | |
365 | ||
366 | tmp = req->wb_this_page; | |
367 | while (tmp != req) { | |
368 | if (!test_bit(bit, &tmp->wb_flags)) | |
369 | return false; | |
370 | tmp = tmp->wb_this_page; | |
371 | } | |
372 | ||
373 | /* true! reset all bits */ | |
374 | tmp = req; | |
375 | do { | |
376 | clear_bit(bit, &tmp->wb_flags); | |
377 | tmp = tmp->wb_this_page; | |
378 | } while (tmp != req); | |
379 | ||
380 | return true; | |
381 | } | |
382 | ||
383 | /* | |
384 | * nfs_page_group_sync_on_bit - set bit on current request, but only | |
385 | * return true if the bit is set for all requests in page group | |
386 | * @req - request in page group | |
387 | * @bit - PG_* bit that is used to sync page group | |
388 | */ | |
389 | bool nfs_page_group_sync_on_bit(struct nfs_page *req, unsigned int bit) | |
390 | { | |
391 | bool ret; | |
392 | ||
1344b7ea | 393 | nfs_page_group_lock(req); |
2bfc6e56 WAA |
394 | ret = nfs_page_group_sync_on_bit_locked(req, bit); |
395 | nfs_page_group_unlock(req); | |
396 | ||
397 | return ret; | |
398 | } | |
399 | ||
400 | /* | |
401 | * nfs_page_group_init - Initialize the page group linkage for @req | |
402 | * @req - a new nfs request | |
403 | * @prev - the previous request in page group, or NULL if @req is the first | |
404 | * or only request in the group (the head). | |
405 | */ | |
406 | static inline void | |
407 | nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev) | |
408 | { | |
cb1410c7 | 409 | struct inode *inode; |
2bfc6e56 WAA |
410 | WARN_ON_ONCE(prev == req); |
411 | ||
412 | if (!prev) { | |
85710a83 | 413 | /* a head request */ |
2bfc6e56 WAA |
414 | req->wb_head = req; |
415 | req->wb_this_page = req; | |
416 | } else { | |
85710a83 | 417 | /* a subrequest */ |
2bfc6e56 WAA |
418 | WARN_ON_ONCE(prev->wb_this_page != prev->wb_head); |
419 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &prev->wb_head->wb_flags)); | |
420 | req->wb_head = prev->wb_head; | |
421 | req->wb_this_page = prev->wb_this_page; | |
422 | prev->wb_this_page = req; | |
423 | ||
85710a83 WAA |
424 | /* All subrequests take a ref on the head request until |
425 | * nfs_page_group_destroy is called */ | |
426 | kref_get(&req->wb_head->wb_kref); | |
427 | ||
cb1410c7 WAA |
428 | /* grab extra ref and bump the request count if head request |
429 | * has extra ref from the write/commit path to handle handoff | |
430 | * between write and commit lists. */ | |
17089a29 | 431 | if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) { |
6dd85e83 | 432 | inode = nfs_page_to_inode(req); |
17089a29 | 433 | set_bit(PG_INODE_REF, &req->wb_flags); |
2bfc6e56 | 434 | kref_get(&req->wb_kref); |
a6b6d5b8 | 435 | atomic_long_inc(&NFS_I(inode)->nrequests); |
17089a29 | 436 | } |
2bfc6e56 WAA |
437 | } |
438 | } | |
439 | ||
440 | /* | |
441 | * nfs_page_group_destroy - sync the destruction of page groups | |
442 | * @req - request that no longer needs the page group | |
443 | * | |
444 | * releases the page group reference from each member once all | |
445 | * members have called this function. | |
446 | */ | |
447 | static void | |
448 | nfs_page_group_destroy(struct kref *kref) | |
449 | { | |
450 | struct nfs_page *req = container_of(kref, struct nfs_page, wb_kref); | |
08fead2a | 451 | struct nfs_page *head = req->wb_head; |
2bfc6e56 WAA |
452 | struct nfs_page *tmp, *next; |
453 | ||
454 | if (!nfs_page_group_sync_on_bit(req, PG_TEARDOWN)) | |
08fead2a | 455 | goto out; |
2bfc6e56 WAA |
456 | |
457 | tmp = req; | |
458 | do { | |
459 | next = tmp->wb_this_page; | |
460 | /* unlink and free */ | |
461 | tmp->wb_this_page = tmp; | |
462 | tmp->wb_head = tmp; | |
463 | nfs_free_request(tmp); | |
464 | tmp = next; | |
465 | } while (tmp != req); | |
08fead2a TM |
466 | out: |
467 | /* subrequests must release the ref on the head request */ | |
468 | if (head != req) | |
469 | nfs_release_request(head); | |
2bfc6e56 WAA |
470 | } |
471 | ||
cbefa53c TM |
472 | static struct nfs_page *nfs_page_create(struct nfs_lock_context *l_ctx, |
473 | unsigned int pgbase, pgoff_t index, | |
474 | unsigned int offset, unsigned int count) | |
1da177e4 | 475 | { |
1da177e4 | 476 | struct nfs_page *req; |
c917cfaf | 477 | struct nfs_open_context *ctx = l_ctx->open_context; |
1da177e4 | 478 | |
c58c8441 TM |
479 | if (test_bit(NFS_CONTEXT_BAD, &ctx->flags)) |
480 | return ERR_PTR(-EBADF); | |
18eb8842 TM |
481 | /* try to allocate the request struct */ |
482 | req = nfs_page_alloc(); | |
483 | if (req == NULL) | |
484 | return ERR_PTR(-ENOMEM); | |
1da177e4 | 485 | |
b3c54de6 | 486 | req->wb_lock_context = l_ctx; |
c917cfaf | 487 | refcount_inc(&l_ctx->count); |
210c7c17 | 488 | atomic_inc(&l_ctx->io_count); |
015f0212 | 489 | |
1da177e4 LT |
490 | /* Initialize the request struct. Initially, we assume a |
491 | * long write-back delay. This will be adjusted in | |
492 | * update_nfs_request below if the region is not locked. */ | |
cbefa53c TM |
493 | req->wb_pgbase = pgbase; |
494 | req->wb_index = index; | |
495 | req->wb_offset = offset; | |
496 | req->wb_bytes = count; | |
c03b4024 | 497 | kref_init(&req->wb_kref); |
33344e0f | 498 | req->wb_nio = 0; |
1da177e4 LT |
499 | return req; |
500 | } | |
501 | ||
cbefa53c TM |
502 | static void nfs_page_assign_folio(struct nfs_page *req, struct folio *folio) |
503 | { | |
504 | if (folio != NULL) { | |
505 | req->wb_folio = folio; | |
506 | folio_get(folio); | |
507 | set_bit(PG_FOLIO, &req->wb_flags); | |
508 | } | |
509 | } | |
510 | ||
511 | static void nfs_page_assign_page(struct nfs_page *req, struct page *page) | |
512 | { | |
513 | if (page != NULL) { | |
514 | req->wb_page = page; | |
515 | get_page(page); | |
516 | } | |
517 | } | |
518 | ||
c917cfaf | 519 | /** |
70e9db69 | 520 | * nfs_page_create_from_page - Create an NFS read/write request. |
c917cfaf TM |
521 | * @ctx: open context to use |
522 | * @page: page to write | |
70e9db69 TM |
523 | * @pgbase: starting offset within the page for the write |
524 | * @offset: file offset for the write | |
c917cfaf TM |
525 | * @count: number of bytes to read/write |
526 | * | |
527 | * The page must be locked by the caller. This makes sure we never | |
528 | * create two different requests for the same page. | |
529 | * User should ensure it is safe to sleep in this function. | |
530 | */ | |
70e9db69 TM |
531 | struct nfs_page *nfs_page_create_from_page(struct nfs_open_context *ctx, |
532 | struct page *page, | |
533 | unsigned int pgbase, loff_t offset, | |
534 | unsigned int count) | |
c917cfaf TM |
535 | { |
536 | struct nfs_lock_context *l_ctx = nfs_get_lock_context(ctx); | |
537 | struct nfs_page *ret; | |
538 | ||
539 | if (IS_ERR(l_ctx)) | |
540 | return ERR_CAST(l_ctx); | |
70e9db69 TM |
541 | ret = nfs_page_create(l_ctx, pgbase, offset >> PAGE_SHIFT, |
542 | offset_in_page(offset), count); | |
cbefa53c TM |
543 | if (!IS_ERR(ret)) { |
544 | nfs_page_assign_page(ret, page); | |
28b1d3f5 | 545 | nfs_page_group_init(ret, NULL); |
cbefa53c | 546 | } |
c917cfaf TM |
547 | nfs_put_lock_context(l_ctx); |
548 | return ret; | |
549 | } | |
550 | ||
ab75bff1 TM |
551 | /** |
552 | * nfs_page_create_from_folio - Create an NFS read/write request. | |
553 | * @ctx: open context to use | |
554 | * @folio: folio to write | |
555 | * @offset: starting offset within the folio for the write | |
556 | * @count: number of bytes to read/write | |
557 | * | |
558 | * The page must be locked by the caller. This makes sure we never | |
559 | * create two different requests for the same page. | |
560 | * User should ensure it is safe to sleep in this function. | |
561 | */ | |
562 | struct nfs_page *nfs_page_create_from_folio(struct nfs_open_context *ctx, | |
563 | struct folio *folio, | |
564 | unsigned int offset, | |
565 | unsigned int count) | |
c917cfaf TM |
566 | { |
567 | struct nfs_lock_context *l_ctx = nfs_get_lock_context(ctx); | |
568 | struct nfs_page *ret; | |
569 | ||
570 | if (IS_ERR(l_ctx)) | |
571 | return ERR_CAST(l_ctx); | |
ab75bff1 TM |
572 | ret = nfs_page_create(l_ctx, offset, folio_index(folio), offset, count); |
573 | if (!IS_ERR(ret)) { | |
574 | nfs_page_assign_folio(ret, folio); | |
28b1d3f5 | 575 | nfs_page_group_init(ret, NULL); |
ab75bff1 | 576 | } |
c917cfaf TM |
577 | nfs_put_lock_context(l_ctx); |
578 | return ret; | |
579 | } | |
580 | ||
581 | static struct nfs_page * | |
44a65a0c TM |
582 | nfs_create_subreq(struct nfs_page *req, |
583 | unsigned int pgbase, | |
584 | unsigned int offset, | |
c917cfaf TM |
585 | unsigned int count) |
586 | { | |
44a65a0c | 587 | struct nfs_page *last; |
c917cfaf | 588 | struct nfs_page *ret; |
cbefa53c | 589 | struct folio *folio = nfs_page_to_folio(req); |
35c5db0e | 590 | struct page *page = nfs_page_to_page(req, pgbase); |
c917cfaf | 591 | |
cbefa53c TM |
592 | ret = nfs_page_create(req->wb_lock_context, pgbase, req->wb_index, |
593 | offset, count); | |
c917cfaf | 594 | if (!IS_ERR(ret)) { |
cbefa53c TM |
595 | if (folio) |
596 | nfs_page_assign_folio(ret, folio); | |
597 | else | |
598 | nfs_page_assign_page(ret, page); | |
44a65a0c TM |
599 | /* find the last request */ |
600 | for (last = req->wb_head; | |
601 | last->wb_this_page != req->wb_head; | |
602 | last = last->wb_this_page) | |
603 | ; | |
604 | ||
c917cfaf | 605 | nfs_lock_request(ret); |
28b1d3f5 | 606 | nfs_page_group_init(ret, last); |
33344e0f | 607 | ret->wb_nio = req->wb_nio; |
c917cfaf TM |
608 | } |
609 | return ret; | |
610 | } | |
611 | ||
1da177e4 | 612 | /** |
1d1afcbc | 613 | * nfs_unlock_request - Unlock request and wake up sleepers. |
302fad7b | 614 | * @req: pointer to request |
1da177e4 | 615 | */ |
1d1afcbc | 616 | void nfs_unlock_request(struct nfs_page *req) |
1da177e4 | 617 | { |
43d20e80 | 618 | clear_bit_unlock(PG_BUSY, &req->wb_flags); |
4e857c58 | 619 | smp_mb__after_atomic(); |
b4f937cf TM |
620 | if (!test_bit(PG_CONTENDED2, &req->wb_flags)) |
621 | return; | |
464a98bd | 622 | wake_up_bit(&req->wb_flags, PG_BUSY); |
3aff4ebb TM |
623 | } |
624 | ||
625 | /** | |
1d1afcbc | 626 | * nfs_unlock_and_release_request - Unlock request and release the nfs_page |
302fad7b | 627 | * @req: pointer to request |
3aff4ebb | 628 | */ |
1d1afcbc | 629 | void nfs_unlock_and_release_request(struct nfs_page *req) |
3aff4ebb | 630 | { |
1d1afcbc | 631 | nfs_unlock_request(req); |
1da177e4 LT |
632 | nfs_release_request(req); |
633 | } | |
634 | ||
4d65c520 | 635 | /* |
1da177e4 LT |
636 | * nfs_clear_request - Free up all resources allocated to the request |
637 | * @req: | |
638 | * | |
bb6fbc45 TM |
639 | * Release page and open context resources associated with a read/write |
640 | * request after it has completed. | |
1da177e4 | 641 | */ |
4d65c520 | 642 | static void nfs_clear_request(struct nfs_page *req) |
1da177e4 | 643 | { |
cbefa53c | 644 | struct folio *folio = nfs_page_to_folio(req); |
cd52ed35 | 645 | struct page *page = req->wb_page; |
f11ac8db | 646 | struct nfs_lock_context *l_ctx = req->wb_lock_context; |
c79d183e | 647 | struct nfs_open_context *ctx; |
bb6fbc45 | 648 | |
cbefa53c TM |
649 | if (folio != NULL) { |
650 | folio_put(folio); | |
651 | req->wb_folio = NULL; | |
652 | clear_bit(PG_FOLIO, &req->wb_flags); | |
653 | } else if (page != NULL) { | |
09cbfeaf | 654 | put_page(page); |
1da177e4 LT |
655 | req->wb_page = NULL; |
656 | } | |
f11ac8db | 657 | if (l_ctx != NULL) { |
7d6ddf88 | 658 | if (atomic_dec_and_test(&l_ctx->io_count)) { |
723c921e | 659 | wake_up_var(&l_ctx->io_count); |
c79d183e | 660 | ctx = l_ctx->open_context; |
7d6ddf88 BC |
661 | if (test_bit(NFS_CONTEXT_UNLOCK, &ctx->flags)) |
662 | rpc_wake_up(&NFS_SERVER(d_inode(ctx->dentry))->uoc_rpcwaitq); | |
663 | } | |
f11ac8db TM |
664 | nfs_put_lock_context(l_ctx); |
665 | req->wb_lock_context = NULL; | |
666 | } | |
1da177e4 LT |
667 | } |
668 | ||
1da177e4 | 669 | /** |
6453bcd0 | 670 | * nfs_free_request - Release the count on an NFS read/write request |
1da177e4 LT |
671 | * @req: request to release |
672 | * | |
673 | * Note: Should never be called with the spinlock held! | |
674 | */ | |
d4581383 | 675 | void nfs_free_request(struct nfs_page *req) |
1da177e4 | 676 | { |
2bfc6e56 WAA |
677 | WARN_ON_ONCE(req->wb_this_page != req); |
678 | ||
679 | /* extra debug: make sure no sync bits are still set */ | |
680 | WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags)); | |
67d0338e WAA |
681 | WARN_ON_ONCE(test_bit(PG_UNLOCKPAGE, &req->wb_flags)); |
682 | WARN_ON_ONCE(test_bit(PG_UPTODATE, &req->wb_flags)); | |
20633f04 WAA |
683 | WARN_ON_ONCE(test_bit(PG_WB_END, &req->wb_flags)); |
684 | WARN_ON_ONCE(test_bit(PG_REMOVE, &req->wb_flags)); | |
1da177e4 | 685 | |
bb6fbc45 | 686 | /* Release struct file and open context */ |
1da177e4 | 687 | nfs_clear_request(req); |
1da177e4 LT |
688 | nfs_page_free(req); |
689 | } | |
690 | ||
c03b4024 TM |
691 | void nfs_release_request(struct nfs_page *req) |
692 | { | |
2bfc6e56 | 693 | kref_put(&req->wb_kref, nfs_page_group_destroy); |
9f557cd8 | 694 | } |
2ce209c4 | 695 | EXPORT_SYMBOL_GPL(nfs_release_request); |
9f557cd8 | 696 | |
1da177e4 LT |
697 | /** |
698 | * nfs_wait_on_request - Wait for a request to complete. | |
699 | * @req: request to wait upon. | |
700 | * | |
150030b7 | 701 | * Interruptible by fatal signals only. |
1da177e4 LT |
702 | * The user is responsible for holding a count on the request. |
703 | */ | |
704 | int | |
705 | nfs_wait_on_request(struct nfs_page *req) | |
706 | { | |
b4f937cf TM |
707 | if (!test_bit(PG_BUSY, &req->wb_flags)) |
708 | return 0; | |
709 | set_bit(PG_CONTENDED2, &req->wb_flags); | |
710 | smp_mb__after_atomic(); | |
74316201 N |
711 | return wait_on_bit_io(&req->wb_flags, PG_BUSY, |
712 | TASK_UNINTERRUPTIBLE); | |
1da177e4 | 713 | } |
2ce209c4 | 714 | EXPORT_SYMBOL_GPL(nfs_wait_on_request); |
1da177e4 | 715 | |
b4fdac1a WAA |
716 | /* |
717 | * nfs_generic_pg_test - determine if requests can be coalesced | |
718 | * @desc: pointer to descriptor | |
719 | * @prev: previous request in desc, or NULL | |
720 | * @req: this request | |
721 | * | |
ac0aa5e8 | 722 | * Returns zero if @req cannot be coalesced into @desc, otherwise it returns |
b4fdac1a WAA |
723 | * the size of the request. |
724 | */ | |
725 | size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, | |
726 | struct nfs_page *prev, struct nfs_page *req) | |
5b36c7dc | 727 | { |
48d635f1 | 728 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb WAA |
729 | |
730 | ||
731 | if (mirror->pg_count > mirror->pg_bsize) { | |
f0cb9ab8 WAA |
732 | /* should never happen */ |
733 | WARN_ON_ONCE(1); | |
5b36c7dc | 734 | return 0; |
f0cb9ab8 | 735 | } |
5b36c7dc | 736 | |
2e11f829 CH |
737 | /* |
738 | * Limit the request size so that we can still allocate a page array | |
739 | * for it without upsetting the slab allocator. | |
740 | */ | |
a7d42ddb | 741 | if (((mirror->pg_count + req->wb_bytes) >> PAGE_SHIFT) * |
048883e0 | 742 | sizeof(struct page *) > PAGE_SIZE) |
2e11f829 CH |
743 | return 0; |
744 | ||
a7d42ddb | 745 | return min(mirror->pg_bsize - mirror->pg_count, (size_t)req->wb_bytes); |
5b36c7dc | 746 | } |
19345cb2 | 747 | EXPORT_SYMBOL_GPL(nfs_generic_pg_test); |
5b36c7dc | 748 | |
1e7f3a48 | 749 | struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *ops) |
4a0de55c | 750 | { |
1e7f3a48 | 751 | struct nfs_pgio_header *hdr = ops->rw_alloc_header(); |
4a0de55c | 752 | |
1e7f3a48 | 753 | if (hdr) { |
4a0de55c | 754 | INIT_LIST_HEAD(&hdr->pages); |
4a0de55c AS |
755 | hdr->rw_ops = ops; |
756 | } | |
1e7f3a48 | 757 | return hdr; |
4a0de55c | 758 | } |
1e7f3a48 | 759 | EXPORT_SYMBOL_GPL(nfs_pgio_header_alloc); |
4a0de55c | 760 | |
00bfa30a | 761 | /** |
4714fb51 WAA |
762 | * nfs_pgio_data_destroy - make @hdr suitable for reuse |
763 | * | |
764 | * Frees memory and releases refs from nfs_generic_pgio, so that it may | |
765 | * be called again. | |
766 | * | |
767 | * @hdr: A header that has had nfs_generic_pgio called | |
00bfa30a | 768 | */ |
196639eb | 769 | static void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr) |
00bfa30a | 770 | { |
3caa0c6e TM |
771 | if (hdr->args.context) |
772 | put_nfs_open_context(hdr->args.context); | |
d45f60c6 WAA |
773 | if (hdr->page_array.pagevec != hdr->page_array.page_array) |
774 | kfree(hdr->page_array.pagevec); | |
00bfa30a | 775 | } |
196639eb TM |
776 | |
777 | /* | |
778 | * nfs_pgio_header_free - Free a read or write header | |
779 | * @hdr: The header to free | |
780 | */ | |
781 | void nfs_pgio_header_free(struct nfs_pgio_header *hdr) | |
782 | { | |
783 | nfs_pgio_data_destroy(hdr); | |
784 | hdr->rw_ops->rw_free_header(hdr); | |
785 | } | |
786 | EXPORT_SYMBOL_GPL(nfs_pgio_header_free); | |
00bfa30a | 787 | |
ce59515c AS |
788 | /** |
789 | * nfs_pgio_rpcsetup - Set up arguments for a pageio call | |
d45f60c6 | 790 | * @hdr: The pageio hdr |
eb9f2a5a | 791 | * @pgbase: base |
ce59515c | 792 | * @count: Number of bytes to read |
ce59515c AS |
793 | * @how: How to commit data (writes only) |
794 | * @cinfo: Commit information for the call (writes only) | |
795 | */ | |
eb9f2a5a TM |
796 | static void nfs_pgio_rpcsetup(struct nfs_pgio_header *hdr, unsigned int pgbase, |
797 | unsigned int count, int how, | |
798 | struct nfs_commit_info *cinfo) | |
ce59515c | 799 | { |
d45f60c6 | 800 | struct nfs_page *req = hdr->req; |
ce59515c AS |
801 | |
802 | /* Set up the RPC argument and reply structs | |
d45f60c6 | 803 | * NB: take care not to mess about with hdr->commit et al. */ |
ce59515c | 804 | |
d45f60c6 | 805 | hdr->args.fh = NFS_FH(hdr->inode); |
e545735a | 806 | hdr->args.offset = req_offset(req); |
ce59515c | 807 | /* pnfs_set_layoutcommit needs this */ |
d45f60c6 | 808 | hdr->mds_offset = hdr->args.offset; |
eb9f2a5a | 809 | hdr->args.pgbase = pgbase; |
d45f60c6 WAA |
810 | hdr->args.pages = hdr->page_array.pagevec; |
811 | hdr->args.count = count; | |
9fcd5960 | 812 | hdr->args.context = get_nfs_open_context(nfs_req_openctx(req)); |
d45f60c6 WAA |
813 | hdr->args.lock_context = req->wb_lock_context; |
814 | hdr->args.stable = NFS_UNSTABLE; | |
ce59515c AS |
815 | switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { |
816 | case 0: | |
817 | break; | |
818 | case FLUSH_COND_STABLE: | |
819 | if (nfs_reqs_to_commit(cinfo)) | |
820 | break; | |
df561f66 | 821 | fallthrough; |
ce59515c | 822 | default: |
d45f60c6 | 823 | hdr->args.stable = NFS_FILE_SYNC; |
ce59515c AS |
824 | } |
825 | ||
d45f60c6 | 826 | hdr->res.fattr = &hdr->fattr; |
17d8c5d1 | 827 | hdr->res.count = 0; |
d45f60c6 | 828 | hdr->res.eof = 0; |
c65e6254 | 829 | hdr->res.verf = &hdr->verf; |
d45f60c6 | 830 | nfs_fattr_init(&hdr->fattr); |
ce59515c AS |
831 | } |
832 | ||
a4cdda59 | 833 | /** |
d45f60c6 | 834 | * nfs_pgio_prepare - Prepare pageio hdr to go over the wire |
a4cdda59 | 835 | * @task: The current task |
d45f60c6 | 836 | * @calldata: pageio header to prepare |
a4cdda59 | 837 | */ |
6f92fa45 | 838 | static void nfs_pgio_prepare(struct rpc_task *task, void *calldata) |
a4cdda59 | 839 | { |
d45f60c6 | 840 | struct nfs_pgio_header *hdr = calldata; |
a4cdda59 | 841 | int err; |
d45f60c6 | 842 | err = NFS_PROTO(hdr->inode)->pgio_rpc_prepare(task, hdr); |
a4cdda59 AS |
843 | if (err) |
844 | rpc_exit(task, err); | |
845 | } | |
846 | ||
d45f60c6 | 847 | int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, |
a52458b4 | 848 | const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, |
1ed26f33 AS |
849 | const struct rpc_call_ops *call_ops, int how, int flags) |
850 | { | |
851 | struct rpc_task *task; | |
852 | struct rpc_message msg = { | |
d45f60c6 WAA |
853 | .rpc_argp = &hdr->args, |
854 | .rpc_resp = &hdr->res, | |
46a5ab47 | 855 | .rpc_cred = cred, |
1ed26f33 AS |
856 | }; |
857 | struct rpc_task_setup task_setup_data = { | |
858 | .rpc_client = clnt, | |
d45f60c6 | 859 | .task = &hdr->task, |
1ed26f33 AS |
860 | .rpc_message = &msg, |
861 | .callback_ops = call_ops, | |
d45f60c6 | 862 | .callback_data = hdr, |
1ed26f33 | 863 | .workqueue = nfsiod_workqueue, |
4fa7ef69 | 864 | .flags = RPC_TASK_ASYNC | flags, |
1ed26f33 | 865 | }; |
1ed26f33 | 866 | |
118f09ed OK |
867 | if (nfs_server_capable(hdr->inode, NFS_CAP_MOVEABLE)) |
868 | task_setup_data.flags |= RPC_TASK_MOVEABLE; | |
869 | ||
abde71f4 | 870 | hdr->rw_ops->rw_initiate(hdr, &msg, rpc_ops, &task_setup_data, how); |
1ed26f33 | 871 | |
b4839ebe | 872 | dprintk("NFS: initiated pgio call " |
1ed26f33 | 873 | "(req %s/%llu, %u bytes @ offset %llu)\n", |
343ae531 AS |
874 | hdr->inode->i_sb->s_id, |
875 | (unsigned long long)NFS_FILEID(hdr->inode), | |
d45f60c6 WAA |
876 | hdr->args.count, |
877 | (unsigned long long)hdr->args.offset); | |
1ed26f33 AS |
878 | |
879 | task = rpc_run_task(&task_setup_data); | |
1de3af98 TM |
880 | if (IS_ERR(task)) |
881 | return PTR_ERR(task); | |
1ed26f33 | 882 | rpc_put_task(task); |
1de3af98 | 883 | return 0; |
1ed26f33 AS |
884 | } |
885 | EXPORT_SYMBOL_GPL(nfs_initiate_pgio); | |
886 | ||
844c9e69 AS |
887 | /** |
888 | * nfs_pgio_error - Clean up from a pageio error | |
844c9e69 AS |
889 | * @hdr: pageio header |
890 | */ | |
2bff2288 | 891 | static void nfs_pgio_error(struct nfs_pgio_header *hdr) |
844c9e69 | 892 | { |
844c9e69 | 893 | set_bit(NFS_IOHDR_REDO, &hdr->flags); |
4714fb51 | 894 | hdr->completion_ops->completion(hdr); |
844c9e69 AS |
895 | } |
896 | ||
a4cdda59 AS |
897 | /** |
898 | * nfs_pgio_release - Release pageio data | |
d45f60c6 | 899 | * @calldata: The pageio header to release |
a4cdda59 | 900 | */ |
6f92fa45 | 901 | static void nfs_pgio_release(void *calldata) |
a4cdda59 | 902 | { |
d45f60c6 | 903 | struct nfs_pgio_header *hdr = calldata; |
4714fb51 | 904 | hdr->completion_ops->completion(hdr); |
a4cdda59 AS |
905 | } |
906 | ||
a7d42ddb WAA |
907 | static void nfs_pageio_mirror_init(struct nfs_pgio_mirror *mirror, |
908 | unsigned int bsize) | |
909 | { | |
910 | INIT_LIST_HEAD(&mirror->pg_list); | |
911 | mirror->pg_bytes_written = 0; | |
912 | mirror->pg_count = 0; | |
913 | mirror->pg_bsize = bsize; | |
914 | mirror->pg_base = 0; | |
915 | mirror->pg_recoalesce = 0; | |
916 | } | |
917 | ||
1da177e4 | 918 | /** |
d8a5ad75 TM |
919 | * nfs_pageio_init - initialise a page io descriptor |
920 | * @desc: pointer to descriptor | |
bcb71bba | 921 | * @inode: pointer to inode |
dfad7000 YW |
922 | * @pg_ops: pointer to pageio operations |
923 | * @compl_ops: pointer to pageio completion operations | |
924 | * @rw_ops: pointer to nfs read/write operations | |
bcb71bba TM |
925 | * @bsize: io block size |
926 | * @io_flags: extra parameters for the io function | |
d8a5ad75 | 927 | */ |
bcb71bba TM |
928 | void nfs_pageio_init(struct nfs_pageio_descriptor *desc, |
929 | struct inode *inode, | |
1751c363 | 930 | const struct nfs_pageio_ops *pg_ops, |
061ae2ed | 931 | const struct nfs_pgio_completion_ops *compl_ops, |
4a0de55c | 932 | const struct nfs_rw_ops *rw_ops, |
84dde76c | 933 | size_t bsize, |
3bde7afd | 934 | int io_flags) |
d8a5ad75 | 935 | { |
b31268ac | 936 | desc->pg_moreio = 0; |
bcb71bba | 937 | desc->pg_inode = inode; |
1751c363 | 938 | desc->pg_ops = pg_ops; |
061ae2ed | 939 | desc->pg_completion_ops = compl_ops; |
4a0de55c | 940 | desc->pg_rw_ops = rw_ops; |
bcb71bba TM |
941 | desc->pg_ioflags = io_flags; |
942 | desc->pg_error = 0; | |
94ad1c80 | 943 | desc->pg_lseg = NULL; |
919e3bd9 | 944 | desc->pg_io_completion = NULL; |
584aa810 | 945 | desc->pg_dreq = NULL; |
000dbe0b | 946 | nfs_netfs_reset_pageio_descriptor(desc); |
a7d42ddb WAA |
947 | desc->pg_bsize = bsize; |
948 | ||
949 | desc->pg_mirror_count = 1; | |
950 | desc->pg_mirror_idx = 0; | |
951 | ||
14abcb0b TM |
952 | desc->pg_mirrors_dynamic = NULL; |
953 | desc->pg_mirrors = desc->pg_mirrors_static; | |
954 | nfs_pageio_mirror_init(&desc->pg_mirrors[0], bsize); | |
33344e0f | 955 | desc->pg_maxretrans = 0; |
d8a5ad75 TM |
956 | } |
957 | ||
0eecb214 AS |
958 | /** |
959 | * nfs_pgio_result - Basic pageio error handling | |
960 | * @task: The task that ran | |
d45f60c6 | 961 | * @calldata: Pageio header to check |
0eecb214 | 962 | */ |
6f92fa45 | 963 | static void nfs_pgio_result(struct rpc_task *task, void *calldata) |
0eecb214 | 964 | { |
d45f60c6 WAA |
965 | struct nfs_pgio_header *hdr = calldata; |
966 | struct inode *inode = hdr->inode; | |
0eecb214 | 967 | |
d45f60c6 | 968 | if (hdr->rw_ops->rw_done(task, hdr, inode) != 0) |
0eecb214 AS |
969 | return; |
970 | if (task->tk_status < 0) | |
d45f60c6 | 971 | nfs_set_pgio_error(hdr, task->tk_status, hdr->args.offset); |
0eecb214 | 972 | else |
d45f60c6 | 973 | hdr->rw_ops->rw_result(task, hdr); |
0eecb214 AS |
974 | } |
975 | ||
ef2c488c AS |
976 | /* |
977 | * Create an RPC task for the given read or write request and kick it. | |
978 | * The page must have been locked by the caller. | |
979 | * | |
980 | * It may happen that the page we're passed is not marked dirty. | |
981 | * This is the case if nfs_updatepage detects a conflicting request | |
982 | * that has been written but not committed. | |
983 | */ | |
f0cb9ab8 WAA |
984 | int nfs_generic_pgio(struct nfs_pageio_descriptor *desc, |
985 | struct nfs_pgio_header *hdr) | |
ef2c488c | 986 | { |
48d635f1 | 987 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb | 988 | |
ef2c488c | 989 | struct nfs_page *req; |
bba5c188 WAA |
990 | struct page **pages, |
991 | *last_page; | |
a7d42ddb | 992 | struct list_head *head = &mirror->pg_list; |
ef2c488c | 993 | struct nfs_commit_info cinfo; |
8ef9b0b9 | 994 | struct nfs_page_array *pg_array = &hdr->page_array; |
bba5c188 | 995 | unsigned int pagecount, pageused; |
eb9f2a5a | 996 | unsigned int pg_base = offset_in_page(mirror->pg_base); |
0bae835b | 997 | gfp_t gfp_flags = nfs_io_gfp_mask(); |
ef2c488c | 998 | |
eb9f2a5a | 999 | pagecount = nfs_page_array_len(pg_base, mirror->pg_count); |
2eb3aea7 | 1000 | pg_array->npages = pagecount; |
8ef9b0b9 BC |
1001 | |
1002 | if (pagecount <= ARRAY_SIZE(pg_array->page_array)) | |
1003 | pg_array->pagevec = pg_array->page_array; | |
1004 | else { | |
8ef9b0b9 BC |
1005 | pg_array->pagevec = kcalloc(pagecount, sizeof(struct page *), gfp_flags); |
1006 | if (!pg_array->pagevec) { | |
1007 | pg_array->npages = 0; | |
1008 | nfs_pgio_error(hdr); | |
1009 | desc->pg_error = -ENOMEM; | |
1010 | return desc->pg_error; | |
1011 | } | |
2bff2288 | 1012 | } |
ef2c488c AS |
1013 | |
1014 | nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq); | |
d45f60c6 | 1015 | pages = hdr->page_array.pagevec; |
bba5c188 WAA |
1016 | last_page = NULL; |
1017 | pageused = 0; | |
ef2c488c | 1018 | while (!list_empty(head)) { |
eb9f2a5a TM |
1019 | struct nfs_page_iter_page i; |
1020 | struct page *page; | |
1021 | ||
ef2c488c | 1022 | req = nfs_list_entry(head->next); |
078b5fd9 | 1023 | nfs_list_move_request(req, &hdr->pages); |
bba5c188 | 1024 | |
785207aa TM |
1025 | if (req->wb_pgbase == 0) |
1026 | last_page = NULL; | |
1027 | ||
eb9f2a5a TM |
1028 | nfs_page_iter_page_init(&i, req); |
1029 | while ((page = nfs_page_iter_page_get(&i)) != NULL) { | |
1030 | if (last_page != page) { | |
1031 | pageused++; | |
1032 | if (pageused > pagecount) | |
1033 | goto full; | |
1034 | *pages++ = last_page = page; | |
1035 | } | |
bba5c188 | 1036 | } |
ef2c488c | 1037 | } |
eb9f2a5a | 1038 | full: |
2bff2288 PT |
1039 | if (WARN_ON_ONCE(pageused != pagecount)) { |
1040 | nfs_pgio_error(hdr); | |
1041 | desc->pg_error = -EINVAL; | |
1042 | return desc->pg_error; | |
1043 | } | |
ef2c488c AS |
1044 | |
1045 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && | |
1046 | (desc->pg_moreio || nfs_reqs_to_commit(&cinfo))) | |
1047 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; | |
1048 | ||
1049 | /* Set up the argument struct */ | |
eb9f2a5a TM |
1050 | nfs_pgio_rpcsetup(hdr, pg_base, mirror->pg_count, desc->pg_ioflags, |
1051 | &cinfo); | |
ef2c488c AS |
1052 | desc->pg_rpc_callops = &nfs_pgio_common_ops; |
1053 | return 0; | |
1054 | } | |
f0cb9ab8 | 1055 | EXPORT_SYMBOL_GPL(nfs_generic_pgio); |
ef2c488c | 1056 | |
41d8d5b7 | 1057 | static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc) |
cf485fcd | 1058 | { |
cf485fcd AS |
1059 | struct nfs_pgio_header *hdr; |
1060 | int ret; | |
85e39fee | 1061 | unsigned short task_flags = 0; |
cf485fcd | 1062 | |
1e7f3a48 WAA |
1063 | hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); |
1064 | if (!hdr) { | |
2bff2288 PT |
1065 | desc->pg_error = -ENOMEM; |
1066 | return desc->pg_error; | |
cf485fcd | 1067 | } |
1e7f3a48 | 1068 | nfs_pgheader_init(desc, hdr, nfs_pgio_header_free); |
cf485fcd | 1069 | ret = nfs_generic_pgio(desc, hdr); |
85e39fee OK |
1070 | if (ret == 0) { |
1071 | if (NFS_SERVER(hdr->inode)->nfs_client->cl_minorversion) | |
1072 | task_flags = RPC_TASK_MOVEABLE; | |
7f714720 | 1073 | ret = nfs_initiate_pgio(NFS_CLIENT(hdr->inode), |
46a5ab47 PT |
1074 | hdr, |
1075 | hdr->cred, | |
1076 | NFS_PROTO(hdr->inode), | |
abde71f4 | 1077 | desc->pg_rpc_callops, |
4fa7ef69 | 1078 | desc->pg_ioflags, |
85e39fee OK |
1079 | RPC_TASK_CRED_NOREF | task_flags); |
1080 | } | |
cf485fcd AS |
1081 | return ret; |
1082 | } | |
1083 | ||
14abcb0b TM |
1084 | static struct nfs_pgio_mirror * |
1085 | nfs_pageio_alloc_mirrors(struct nfs_pageio_descriptor *desc, | |
1086 | unsigned int mirror_count) | |
1087 | { | |
1088 | struct nfs_pgio_mirror *ret; | |
1089 | unsigned int i; | |
1090 | ||
1091 | kfree(desc->pg_mirrors_dynamic); | |
1092 | desc->pg_mirrors_dynamic = NULL; | |
1093 | if (mirror_count == 1) | |
1094 | return desc->pg_mirrors_static; | |
0bae835b | 1095 | ret = kmalloc_array(mirror_count, sizeof(*ret), nfs_io_gfp_mask()); |
14abcb0b TM |
1096 | if (ret != NULL) { |
1097 | for (i = 0; i < mirror_count; i++) | |
1098 | nfs_pageio_mirror_init(&ret[i], desc->pg_bsize); | |
1099 | desc->pg_mirrors_dynamic = ret; | |
1100 | } | |
1101 | return ret; | |
1102 | } | |
1103 | ||
a7d42ddb WAA |
1104 | /* |
1105 | * nfs_pageio_setup_mirroring - determine if mirroring is to be used | |
1106 | * by calling the pg_get_mirror_count op | |
1107 | */ | |
14abcb0b | 1108 | static void nfs_pageio_setup_mirroring(struct nfs_pageio_descriptor *pgio, |
a7d42ddb WAA |
1109 | struct nfs_page *req) |
1110 | { | |
14abcb0b | 1111 | unsigned int mirror_count = 1; |
a7d42ddb | 1112 | |
14abcb0b TM |
1113 | if (pgio->pg_ops->pg_get_mirror_count) |
1114 | mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req); | |
1115 | if (mirror_count == pgio->pg_mirror_count || pgio->pg_error < 0) | |
1116 | return; | |
a7d42ddb | 1117 | |
14abcb0b TM |
1118 | if (!mirror_count || mirror_count > NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX) { |
1119 | pgio->pg_error = -EINVAL; | |
1120 | return; | |
1121 | } | |
a7d42ddb | 1122 | |
14abcb0b TM |
1123 | pgio->pg_mirrors = nfs_pageio_alloc_mirrors(pgio, mirror_count); |
1124 | if (pgio->pg_mirrors == NULL) { | |
1125 | pgio->pg_error = -ENOMEM; | |
1126 | pgio->pg_mirrors = pgio->pg_mirrors_static; | |
1127 | mirror_count = 1; | |
1128 | } | |
a7d42ddb | 1129 | pgio->pg_mirror_count = mirror_count; |
a7d42ddb WAA |
1130 | } |
1131 | ||
a7d42ddb WAA |
1132 | static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio) |
1133 | { | |
1134 | pgio->pg_mirror_count = 1; | |
1135 | pgio->pg_mirror_idx = 0; | |
1136 | pgio->pg_mirrors = pgio->pg_mirrors_static; | |
1137 | kfree(pgio->pg_mirrors_dynamic); | |
1138 | pgio->pg_mirrors_dynamic = NULL; | |
1139 | } | |
1140 | ||
4109bb74 TM |
1141 | static bool nfs_match_lock_context(const struct nfs_lock_context *l1, |
1142 | const struct nfs_lock_context *l2) | |
1143 | { | |
d51fdb87 | 1144 | return l1->lockowner == l2->lockowner; |
4109bb74 TM |
1145 | } |
1146 | ||
8e0bdc70 TM |
1147 | static bool nfs_page_is_contiguous(const struct nfs_page *prev, |
1148 | const struct nfs_page *req) | |
1149 | { | |
1150 | size_t prev_end = prev->wb_pgbase + prev->wb_bytes; | |
1151 | ||
1152 | if (req_offset(req) != req_offset(prev) + prev->wb_bytes) | |
1153 | return false; | |
1154 | if (req->wb_pgbase == 0) | |
1155 | return prev_end == nfs_page_max_length(prev); | |
1156 | if (req->wb_pgbase == prev_end) { | |
1157 | struct folio *folio = nfs_page_to_folio(req); | |
1158 | if (folio) | |
1159 | return folio == nfs_page_to_folio(prev); | |
1160 | return req->wb_page == prev->wb_page; | |
1161 | } | |
1162 | return false; | |
1163 | } | |
1164 | ||
d8a5ad75 | 1165 | /** |
44a65a0c | 1166 | * nfs_coalesce_size - test two requests for compatibility |
d8a5ad75 TM |
1167 | * @prev: pointer to nfs_page |
1168 | * @req: pointer to nfs_page | |
302fad7b | 1169 | * @pgio: pointer to nfs_pagio_descriptor |
d8a5ad75 TM |
1170 | * |
1171 | * The nfs_page structures 'prev' and 'req' are compared to ensure that the | |
1172 | * page data area they describe is contiguous, and that their RPC | |
1173 | * credentials, NFSv4 open state, and lockowners are the same. | |
1174 | * | |
44a65a0c | 1175 | * Returns size of the request that can be coalesced |
d8a5ad75 | 1176 | */ |
44a65a0c | 1177 | static unsigned int nfs_coalesce_size(struct nfs_page *prev, |
18ad0a9f BH |
1178 | struct nfs_page *req, |
1179 | struct nfs_pageio_descriptor *pgio) | |
d8a5ad75 | 1180 | { |
5263e31e | 1181 | struct file_lock_context *flctx; |
b4fdac1a | 1182 | |
ab75e417 | 1183 | if (prev) { |
9fcd5960 | 1184 | if (!nfs_match_open_context(nfs_req_openctx(req), nfs_req_openctx(prev))) |
44a65a0c | 1185 | return 0; |
17b985de | 1186 | flctx = locks_inode_context(d_inode(nfs_req_openctx(req)->dentry)); |
bd61e0a9 JL |
1187 | if (flctx != NULL && |
1188 | !(list_empty_careful(&flctx->flc_posix) && | |
1189 | list_empty_careful(&flctx->flc_flock)) && | |
5263e31e JL |
1190 | !nfs_match_lock_context(req->wb_lock_context, |
1191 | prev->wb_lock_context)) | |
44a65a0c | 1192 | return 0; |
8e0bdc70 | 1193 | if (!nfs_page_is_contiguous(prev, req)) |
44a65a0c | 1194 | return 0; |
ab75e417 | 1195 | } |
44a65a0c | 1196 | return pgio->pg_ops->pg_test(pgio, prev, req); |
d8a5ad75 TM |
1197 | } |
1198 | ||
1199 | /** | |
bcb71bba | 1200 | * nfs_pageio_do_add_request - Attempt to coalesce a request into a page list. |
d8a5ad75 TM |
1201 | * @desc: destination io descriptor |
1202 | * @req: request | |
1203 | * | |
44a65a0c TM |
1204 | * If the request 'req' was successfully coalesced into the existing list |
1205 | * of pages 'desc', it returns the size of req. | |
d8a5ad75 | 1206 | */ |
44a65a0c TM |
1207 | static unsigned int |
1208 | nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc, | |
1209 | struct nfs_page *req) | |
d8a5ad75 | 1210 | { |
48d635f1 | 1211 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
ab75e417 | 1212 | struct nfs_page *prev = NULL; |
44a65a0c | 1213 | unsigned int size; |
a7d42ddb | 1214 | |
56517ab9 | 1215 | if (list_empty(&mirror->pg_list)) { |
d8007d4d TM |
1216 | if (desc->pg_ops->pg_init) |
1217 | desc->pg_ops->pg_init(desc, req); | |
d600ad1f PT |
1218 | if (desc->pg_error < 0) |
1219 | return 0; | |
a7d42ddb | 1220 | mirror->pg_base = req->wb_pgbase; |
56517ab9 TM |
1221 | mirror->pg_count = 0; |
1222 | mirror->pg_recoalesce = 0; | |
1223 | } else | |
1224 | prev = nfs_list_entry(mirror->pg_list.prev); | |
33344e0f TM |
1225 | |
1226 | if (desc->pg_maxretrans && req->wb_nio > desc->pg_maxretrans) { | |
1227 | if (NFS_SERVER(desc->pg_inode)->flags & NFS_MOUNT_SOFTERR) | |
1228 | desc->pg_error = -ETIMEDOUT; | |
1229 | else | |
1230 | desc->pg_error = -EIO; | |
1231 | return 0; | |
1232 | } | |
1233 | ||
44a65a0c TM |
1234 | size = nfs_coalesce_size(prev, req, desc); |
1235 | if (size < req->wb_bytes) | |
1236 | return size; | |
078b5fd9 | 1237 | nfs_list_move_request(req, &mirror->pg_list); |
a7d42ddb | 1238 | mirror->pg_count += req->wb_bytes; |
44a65a0c | 1239 | return req->wb_bytes; |
d8a5ad75 TM |
1240 | } |
1241 | ||
bcb71bba TM |
1242 | /* |
1243 | * Helper for nfs_pageio_add_request and nfs_pageio_complete | |
1244 | */ | |
1245 | static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc) | |
1246 | { | |
48d635f1 | 1247 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb | 1248 | |
a7d42ddb | 1249 | if (!list_empty(&mirror->pg_list)) { |
1751c363 | 1250 | int error = desc->pg_ops->pg_doio(desc); |
bcb71bba TM |
1251 | if (error < 0) |
1252 | desc->pg_error = error; | |
70536bf4 | 1253 | if (list_empty(&mirror->pg_list)) |
a7d42ddb | 1254 | mirror->pg_bytes_written += mirror->pg_count; |
bcb71bba TM |
1255 | } |
1256 | } | |
1257 | ||
f57dcf4c TM |
1258 | static void |
1259 | nfs_pageio_cleanup_request(struct nfs_pageio_descriptor *desc, | |
1260 | struct nfs_page *req) | |
1261 | { | |
1262 | LIST_HEAD(head); | |
1263 | ||
078b5fd9 | 1264 | nfs_list_move_request(req, &head); |
df3accb8 | 1265 | desc->pg_completion_ops->error_cleanup(&head, desc->pg_error); |
f57dcf4c TM |
1266 | } |
1267 | ||
bcb71bba | 1268 | /** |
6453bcd0 | 1269 | * __nfs_pageio_add_request - Attempt to coalesce a request into a page list. |
bcb71bba TM |
1270 | * @desc: destination io descriptor |
1271 | * @req: request | |
1272 | * | |
2bfc6e56 | 1273 | * This may split a request into subrequests which are all part of the |
44a65a0c TM |
1274 | * same page group. If so, it will submit @req as the last one, to ensure |
1275 | * the pointer to @req is still valid in case of failure. | |
2bfc6e56 | 1276 | * |
bcb71bba TM |
1277 | * Returns true if the request 'req' was successfully coalesced into the |
1278 | * existing list of pages 'desc'. | |
1279 | */ | |
d9156f9f | 1280 | static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc, |
8b09bee3 | 1281 | struct nfs_page *req) |
bcb71bba | 1282 | { |
48d635f1 | 1283 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
2bfc6e56 | 1284 | struct nfs_page *subreq; |
44a65a0c | 1285 | unsigned int size, subreq_size; |
2bfc6e56 | 1286 | |
1344b7ea | 1287 | nfs_page_group_lock(req); |
2bfc6e56 WAA |
1288 | |
1289 | subreq = req; | |
44a65a0c TM |
1290 | subreq_size = subreq->wb_bytes; |
1291 | for(;;) { | |
1292 | size = nfs_pageio_do_add_request(desc, subreq); | |
1293 | if (size == subreq_size) { | |
1294 | /* We successfully submitted a request */ | |
1295 | if (subreq == req) | |
1296 | break; | |
1297 | req->wb_pgbase += size; | |
1298 | req->wb_bytes -= size; | |
1299 | req->wb_offset += size; | |
1300 | subreq_size = req->wb_bytes; | |
1301 | subreq = req; | |
1302 | continue; | |
1303 | } | |
1304 | if (WARN_ON_ONCE(subreq != req)) { | |
1305 | nfs_page_group_unlock(req); | |
1306 | nfs_pageio_cleanup_request(desc, subreq); | |
1307 | subreq = req; | |
1308 | subreq_size = req->wb_bytes; | |
1309 | nfs_page_group_lock(req); | |
1310 | } | |
1311 | if (!size) { | |
1312 | /* Can't coalesce any more, so do I/O */ | |
2bfc6e56 WAA |
1313 | nfs_page_group_unlock(req); |
1314 | desc->pg_moreio = 1; | |
1315 | nfs_pageio_doio(desc); | |
f57dcf4c | 1316 | if (desc->pg_error < 0 || mirror->pg_recoalesce) |
44a65a0c | 1317 | return 0; |
2bfc6e56 | 1318 | /* retry add_request for this subreq */ |
1344b7ea | 1319 | nfs_page_group_lock(req); |
2bfc6e56 WAA |
1320 | continue; |
1321 | } | |
44a65a0c TM |
1322 | subreq = nfs_create_subreq(req, req->wb_pgbase, |
1323 | req->wb_offset, size); | |
1324 | if (IS_ERR(subreq)) | |
1325 | goto err_ptr; | |
1326 | subreq_size = size; | |
1327 | } | |
2bfc6e56 WAA |
1328 | |
1329 | nfs_page_group_unlock(req); | |
bcb71bba | 1330 | return 1; |
c1109558 TM |
1331 | err_ptr: |
1332 | desc->pg_error = PTR_ERR(subreq); | |
1333 | nfs_page_group_unlock(req); | |
1334 | return 0; | |
bcb71bba TM |
1335 | } |
1336 | ||
d9156f9f TM |
1337 | static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc) |
1338 | { | |
48d635f1 | 1339 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
d9156f9f TM |
1340 | LIST_HEAD(head); |
1341 | ||
1342 | do { | |
a7d42ddb | 1343 | list_splice_init(&mirror->pg_list, &head); |
d02d81ef | 1344 | mirror->pg_recoalesce = 0; |
a7d42ddb | 1345 | |
d9156f9f TM |
1346 | while (!list_empty(&head)) { |
1347 | struct nfs_page *req; | |
1348 | ||
1349 | req = list_first_entry(&head, struct nfs_page, wb_list); | |
d9156f9f TM |
1350 | if (__nfs_pageio_add_request(desc, req)) |
1351 | continue; | |
03d5eb65 TM |
1352 | if (desc->pg_error < 0) { |
1353 | list_splice_tail(&head, &mirror->pg_list); | |
1354 | mirror->pg_recoalesce = 1; | |
d9156f9f | 1355 | return 0; |
03d5eb65 | 1356 | } |
d9156f9f TM |
1357 | break; |
1358 | } | |
a7d42ddb | 1359 | } while (mirror->pg_recoalesce); |
d9156f9f TM |
1360 | return 1; |
1361 | } | |
1362 | ||
a7d42ddb | 1363 | static int nfs_pageio_add_request_mirror(struct nfs_pageio_descriptor *desc, |
d9156f9f TM |
1364 | struct nfs_page *req) |
1365 | { | |
1366 | int ret; | |
1367 | ||
1368 | do { | |
1369 | ret = __nfs_pageio_add_request(desc, req); | |
1370 | if (ret) | |
1371 | break; | |
1372 | if (desc->pg_error < 0) | |
1373 | break; | |
1374 | ret = nfs_do_recoalesce(desc); | |
1375 | } while (ret); | |
a7d42ddb | 1376 | |
d9156f9f TM |
1377 | return ret; |
1378 | } | |
1379 | ||
fdbd1a2e BC |
1380 | static void nfs_pageio_error_cleanup(struct nfs_pageio_descriptor *desc) |
1381 | { | |
1382 | u32 midx; | |
1383 | struct nfs_pgio_mirror *mirror; | |
1384 | ||
1385 | if (!desc->pg_error) | |
1386 | return; | |
1387 | ||
1388 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { | |
63e2fffa | 1389 | mirror = nfs_pgio_get_mirror(desc, midx); |
df3accb8 TM |
1390 | desc->pg_completion_ops->error_cleanup(&mirror->pg_list, |
1391 | desc->pg_error); | |
fdbd1a2e BC |
1392 | } |
1393 | } | |
1394 | ||
a7d42ddb WAA |
1395 | int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc, |
1396 | struct nfs_page *req) | |
1397 | { | |
1398 | u32 midx; | |
1399 | unsigned int pgbase, offset, bytes; | |
44a65a0c | 1400 | struct nfs_page *dupreq; |
a7d42ddb WAA |
1401 | |
1402 | pgbase = req->wb_pgbase; | |
1403 | offset = req->wb_offset; | |
1404 | bytes = req->wb_bytes; | |
1405 | ||
1406 | nfs_pageio_setup_mirroring(desc, req); | |
d600ad1f | 1407 | if (desc->pg_error < 0) |
c18b96a1 | 1408 | goto out_failed; |
a7d42ddb | 1409 | |
dc9dc2fe TM |
1410 | /* Create the mirror instances first, and fire them off */ |
1411 | for (midx = 1; midx < desc->pg_mirror_count; midx++) { | |
1412 | nfs_page_group_lock(req); | |
1413 | ||
44a65a0c | 1414 | dupreq = nfs_create_subreq(req, |
dc9dc2fe TM |
1415 | pgbase, offset, bytes); |
1416 | ||
1417 | nfs_page_group_unlock(req); | |
1418 | if (IS_ERR(dupreq)) { | |
1419 | desc->pg_error = PTR_ERR(dupreq); | |
1420 | goto out_failed; | |
1421 | } | |
a7d42ddb | 1422 | |
63e2fffa | 1423 | nfs_pgio_set_current_mirror(desc, midx); |
a7d42ddb | 1424 | if (!nfs_pageio_add_request_mirror(desc, dupreq)) |
f57dcf4c | 1425 | goto out_cleanup_subreq; |
a7d42ddb WAA |
1426 | } |
1427 | ||
63e2fffa | 1428 | nfs_pgio_set_current_mirror(desc, 0); |
dc9dc2fe TM |
1429 | if (!nfs_pageio_add_request_mirror(desc, req)) |
1430 | goto out_failed; | |
1431 | ||
a7d42ddb | 1432 | return 1; |
c18b96a1 | 1433 | |
f57dcf4c | 1434 | out_cleanup_subreq: |
dc9dc2fe | 1435 | nfs_pageio_cleanup_request(desc, dupreq); |
c18b96a1 | 1436 | out_failed: |
fdbd1a2e | 1437 | nfs_pageio_error_cleanup(desc); |
c18b96a1 | 1438 | return 0; |
a7d42ddb WAA |
1439 | } |
1440 | ||
1441 | /* | |
1442 | * nfs_pageio_complete_mirror - Complete I/O on the current mirror of an | |
1443 | * nfs_pageio_descriptor | |
1444 | * @desc: pointer to io descriptor | |
dfad7000 | 1445 | * @mirror_idx: pointer to mirror index |
a7d42ddb WAA |
1446 | */ |
1447 | static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc, | |
1448 | u32 mirror_idx) | |
1449 | { | |
63e2fffa TM |
1450 | struct nfs_pgio_mirror *mirror; |
1451 | u32 restore_idx; | |
1452 | ||
1453 | restore_idx = nfs_pgio_set_current_mirror(desc, mirror_idx); | |
1454 | mirror = nfs_pgio_current_mirror(desc); | |
a7d42ddb | 1455 | |
a7d42ddb WAA |
1456 | for (;;) { |
1457 | nfs_pageio_doio(desc); | |
8127d827 | 1458 | if (desc->pg_error < 0 || !mirror->pg_recoalesce) |
a7d42ddb WAA |
1459 | break; |
1460 | if (!nfs_do_recoalesce(desc)) | |
1461 | break; | |
1462 | } | |
63e2fffa | 1463 | nfs_pgio_set_current_mirror(desc, restore_idx); |
a7d42ddb WAA |
1464 | } |
1465 | ||
53113ad3 WAA |
1466 | /* |
1467 | * nfs_pageio_resend - Transfer requests to new descriptor and resend | |
1468 | * @hdr - the pgio header to move request from | |
1469 | * @desc - the pageio descriptor to add requests to | |
1470 | * | |
1471 | * Try to move each request (nfs_page) from @hdr to @desc then attempt | |
1472 | * to send them. | |
1473 | * | |
1474 | * Returns 0 on success and < 0 on error. | |
1475 | */ | |
1476 | int nfs_pageio_resend(struct nfs_pageio_descriptor *desc, | |
1477 | struct nfs_pgio_header *hdr) | |
1478 | { | |
f4340e93 | 1479 | LIST_HEAD(pages); |
53113ad3 | 1480 | |
919e3bd9 | 1481 | desc->pg_io_completion = hdr->io_completion; |
53113ad3 | 1482 | desc->pg_dreq = hdr->dreq; |
000dbe0b | 1483 | nfs_netfs_set_pageio_descriptor(desc, hdr); |
f4340e93 TM |
1484 | list_splice_init(&hdr->pages, &pages); |
1485 | while (!list_empty(&pages)) { | |
1486 | struct nfs_page *req = nfs_list_entry(pages.next); | |
53113ad3 | 1487 | |
53113ad3 | 1488 | if (!nfs_pageio_add_request(desc, req)) |
f4340e93 | 1489 | break; |
53113ad3 WAA |
1490 | } |
1491 | nfs_pageio_complete(desc); | |
f4340e93 TM |
1492 | if (!list_empty(&pages)) { |
1493 | int err = desc->pg_error < 0 ? desc->pg_error : -EIO; | |
1494 | hdr->completion_ops->error_cleanup(&pages, err); | |
eb2c50da | 1495 | nfs_set_pgio_error(hdr, err, hdr->io_start); |
f4340e93 | 1496 | return err; |
53113ad3 WAA |
1497 | } |
1498 | return 0; | |
1499 | } | |
1500 | EXPORT_SYMBOL_GPL(nfs_pageio_resend); | |
d9156f9f | 1501 | |
bcb71bba | 1502 | /** |
2176bf42 | 1503 | * nfs_pageio_complete - Complete I/O then cleanup an nfs_pageio_descriptor |
bcb71bba TM |
1504 | * @desc: pointer to io descriptor |
1505 | */ | |
1506 | void nfs_pageio_complete(struct nfs_pageio_descriptor *desc) | |
1507 | { | |
a7d42ddb WAA |
1508 | u32 midx; |
1509 | ||
1510 | for (midx = 0; midx < desc->pg_mirror_count; midx++) | |
1511 | nfs_pageio_complete_mirror(desc, midx); | |
2176bf42 | 1512 | |
fdbd1a2e BC |
1513 | if (desc->pg_error < 0) |
1514 | nfs_pageio_error_cleanup(desc); | |
2176bf42 WAA |
1515 | if (desc->pg_ops->pg_cleanup) |
1516 | desc->pg_ops->pg_cleanup(desc); | |
a7d42ddb | 1517 | nfs_pageio_cleanup_mirroring(desc); |
bcb71bba TM |
1518 | } |
1519 | ||
7fe7f848 TM |
1520 | /** |
1521 | * nfs_pageio_cond_complete - Conditional I/O completion | |
1522 | * @desc: pointer to io descriptor | |
1523 | * @index: page index | |
1524 | * | |
1525 | * It is important to ensure that processes don't try to take locks | |
1526 | * on non-contiguous ranges of pages as that might deadlock. This | |
1527 | * function should be called before attempting to wait on a locked | |
1528 | * nfs_page. It will complete the I/O if the page index 'index' | |
1529 | * is not contiguous with the existing list of pages in 'desc'. | |
1530 | */ | |
1531 | void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index) | |
1532 | { | |
a7d42ddb WAA |
1533 | struct nfs_pgio_mirror *mirror; |
1534 | struct nfs_page *prev; | |
cbefa53c | 1535 | struct folio *folio; |
a7d42ddb WAA |
1536 | u32 midx; |
1537 | ||
1538 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { | |
63e2fffa | 1539 | mirror = nfs_pgio_get_mirror(desc, midx); |
a7d42ddb WAA |
1540 | if (!list_empty(&mirror->pg_list)) { |
1541 | prev = nfs_list_entry(mirror->pg_list.prev); | |
cbefa53c TM |
1542 | folio = nfs_page_to_folio(prev); |
1543 | if (folio) { | |
1544 | if (index == folio_next_index(folio)) | |
1545 | continue; | |
1546 | } else if (index == prev->wb_index + 1) | |
1547 | continue; | |
1548 | nfs_pageio_complete(desc); | |
1549 | break; | |
a7d42ddb | 1550 | } |
7fe7f848 TM |
1551 | } |
1552 | } | |
1553 | ||
862f35c9 TM |
1554 | /* |
1555 | * nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1) | |
1556 | */ | |
1557 | void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio) | |
1558 | { | |
1559 | nfs_pageio_complete(pgio); | |
1560 | } | |
1561 | ||
f7b422b1 | 1562 | int __init nfs_init_nfspagecache(void) |
1da177e4 LT |
1563 | { |
1564 | nfs_page_cachep = kmem_cache_create("nfs_page", | |
1565 | sizeof(struct nfs_page), | |
1566 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1567 | NULL); |
1da177e4 LT |
1568 | if (nfs_page_cachep == NULL) |
1569 | return -ENOMEM; | |
1570 | ||
1571 | return 0; | |
1572 | } | |
1573 | ||
266bee88 | 1574 | void nfs_destroy_nfspagecache(void) |
1da177e4 | 1575 | { |
1a1d92c1 | 1576 | kmem_cache_destroy(nfs_page_cachep); |
1da177e4 LT |
1577 | } |
1578 | ||
ef2c488c | 1579 | static const struct rpc_call_ops nfs_pgio_common_ops = { |
6f92fa45 AS |
1580 | .rpc_call_prepare = nfs_pgio_prepare, |
1581 | .rpc_call_done = nfs_pgio_result, | |
1582 | .rpc_release = nfs_pgio_release, | |
1583 | }; | |
41d8d5b7 AS |
1584 | |
1585 | const struct nfs_pageio_ops nfs_pgio_rw_ops = { | |
1586 | .pg_test = nfs_generic_pg_test, | |
1587 | .pg_doio = nfs_generic_pg_pgios, | |
1588 | }; |