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> |
1da177e4 | 24 | |
8d5658c9 | 25 | #include "internal.h" |
bae724ef | 26 | #include "pnfs.h" |
8d5658c9 | 27 | |
0eecb214 AS |
28 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
29 | ||
e18b890b | 30 | static struct kmem_cache *nfs_page_cachep; |
ef2c488c | 31 | static const struct rpc_call_ops nfs_pgio_common_ops; |
1da177e4 | 32 | |
48d635f1 PT |
33 | struct nfs_pgio_mirror * |
34 | nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc) | |
35 | { | |
36 | return nfs_pgio_has_mirroring(desc) ? | |
37 | &desc->pg_mirrors[desc->pg_mirror_idx] : | |
38 | &desc->pg_mirrors[0]; | |
39 | } | |
40 | EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror); | |
41 | ||
4db6e0b7 FI |
42 | void nfs_pgheader_init(struct nfs_pageio_descriptor *desc, |
43 | struct nfs_pgio_header *hdr, | |
44 | void (*release)(struct nfs_pgio_header *hdr)) | |
45 | { | |
48d635f1 | 46 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb WAA |
47 | |
48 | ||
49 | hdr->req = nfs_list_entry(mirror->pg_list.next); | |
4db6e0b7 | 50 | hdr->inode = desc->pg_inode; |
9fcd5960 | 51 | hdr->cred = nfs_req_openctx(hdr->req)->cred; |
4db6e0b7 | 52 | hdr->io_start = req_offset(hdr->req); |
a7d42ddb | 53 | hdr->good_bytes = mirror->pg_count; |
919e3bd9 | 54 | hdr->io_completion = desc->pg_io_completion; |
584aa810 | 55 | hdr->dreq = desc->pg_dreq; |
4db6e0b7 | 56 | hdr->release = release; |
061ae2ed | 57 | hdr->completion_ops = desc->pg_completion_ops; |
584aa810 FI |
58 | if (hdr->completion_ops->init_hdr) |
59 | hdr->completion_ops->init_hdr(hdr); | |
a7d42ddb WAA |
60 | |
61 | hdr->pgio_mirror_idx = desc->pg_mirror_idx; | |
4db6e0b7 | 62 | } |
89d77c8f | 63 | EXPORT_SYMBOL_GPL(nfs_pgheader_init); |
4db6e0b7 FI |
64 | |
65 | void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos) | |
66 | { | |
1c6c4b74 TM |
67 | unsigned int new = pos - hdr->io_start; |
68 | ||
69 | if (hdr->good_bytes > new) { | |
70 | hdr->good_bytes = new; | |
4db6e0b7 | 71 | clear_bit(NFS_IOHDR_EOF, &hdr->flags); |
1c6c4b74 TM |
72 | if (!test_and_set_bit(NFS_IOHDR_ERROR, &hdr->flags)) |
73 | hdr->error = error; | |
4db6e0b7 | 74 | } |
4db6e0b7 FI |
75 | } |
76 | ||
1da177e4 LT |
77 | static inline struct nfs_page * |
78 | nfs_page_alloc(void) | |
79 | { | |
2b17d725 | 80 | struct nfs_page *p = kmem_cache_zalloc(nfs_page_cachep, GFP_KERNEL); |
72895b1a | 81 | if (p) |
1da177e4 | 82 | INIT_LIST_HEAD(&p->wb_list); |
1da177e4 LT |
83 | return p; |
84 | } | |
85 | ||
86 | static inline void | |
87 | nfs_page_free(struct nfs_page *p) | |
88 | { | |
89 | kmem_cache_free(nfs_page_cachep, p); | |
90 | } | |
91 | ||
577b4232 TM |
92 | /** |
93 | * nfs_iocounter_wait - wait for i/o to complete | |
210c7c17 | 94 | * @l_ctx: nfs_lock_context with io_counter to use |
577b4232 TM |
95 | * |
96 | * returns -ERESTARTSYS if interrupted by a fatal signal. | |
97 | * Otherwise returns 0 once the io_count hits 0. | |
98 | */ | |
99 | int | |
210c7c17 | 100 | nfs_iocounter_wait(struct nfs_lock_context *l_ctx) |
577b4232 | 101 | { |
723c921e PZ |
102 | return wait_var_event_killable(&l_ctx->io_count, |
103 | !atomic_read(&l_ctx->io_count)); | |
577b4232 TM |
104 | } |
105 | ||
7d6ddf88 BC |
106 | /** |
107 | * nfs_async_iocounter_wait - wait on a rpc_waitqueue for I/O | |
108 | * to complete | |
109 | * @task: the rpc_task that should wait | |
110 | * @l_ctx: nfs_lock_context with io_counter to check | |
111 | * | |
112 | * Returns true if there is outstanding I/O to wait on and the | |
113 | * task has been put to sleep. | |
114 | */ | |
115 | bool | |
116 | nfs_async_iocounter_wait(struct rpc_task *task, struct nfs_lock_context *l_ctx) | |
117 | { | |
118 | struct inode *inode = d_inode(l_ctx->open_context->dentry); | |
119 | bool ret = false; | |
120 | ||
121 | if (atomic_read(&l_ctx->io_count) > 0) { | |
122 | rpc_sleep_on(&NFS_SERVER(inode)->uoc_rpcwaitq, task, NULL); | |
123 | ret = true; | |
124 | } | |
125 | ||
126 | if (atomic_read(&l_ctx->io_count) == 0) { | |
127 | rpc_wake_up_queued_task(&NFS_SERVER(inode)->uoc_rpcwaitq, task); | |
128 | ret = false; | |
129 | } | |
130 | ||
131 | return ret; | |
132 | } | |
133 | EXPORT_SYMBOL_GPL(nfs_async_iocounter_wait); | |
134 | ||
2bfc6e56 WAA |
135 | /* |
136 | * nfs_page_group_lock - lock the head of the page group | |
137 | * @req - request in group that is to be locked | |
138 | * | |
1344b7ea TM |
139 | * this lock must be held when traversing or modifying the page |
140 | * group list | |
e7029206 | 141 | * |
1344b7ea | 142 | * return 0 on success, < 0 on error |
2bfc6e56 | 143 | */ |
e7029206 | 144 | int |
1344b7ea | 145 | nfs_page_group_lock(struct nfs_page *req) |
2bfc6e56 WAA |
146 | { |
147 | struct nfs_page *head = req->wb_head; | |
2bfc6e56 WAA |
148 | |
149 | WARN_ON_ONCE(head != head->wb_head); | |
150 | ||
bc8a309e WAA |
151 | if (!test_and_set_bit(PG_HEADLOCK, &head->wb_flags)) |
152 | return 0; | |
e7029206 | 153 | |
1344b7ea TM |
154 | set_bit(PG_CONTENDED1, &head->wb_flags); |
155 | smp_mb__after_atomic(); | |
156 | return wait_on_bit_lock(&head->wb_flags, PG_HEADLOCK, | |
bc8a309e | 157 | TASK_UNINTERRUPTIBLE); |
2bfc6e56 WAA |
158 | } |
159 | ||
160 | /* | |
161 | * nfs_page_group_unlock - unlock the head of the page group | |
162 | * @req - request in group that is to be unlocked | |
163 | */ | |
164 | void | |
165 | nfs_page_group_unlock(struct nfs_page *req) | |
166 | { | |
167 | struct nfs_page *head = req->wb_head; | |
168 | ||
169 | WARN_ON_ONCE(head != head->wb_head); | |
170 | ||
d1e1cda8 | 171 | smp_mb__before_atomic(); |
2bfc6e56 | 172 | clear_bit(PG_HEADLOCK, &head->wb_flags); |
d1e1cda8 | 173 | smp_mb__after_atomic(); |
b4f937cf TM |
174 | if (!test_bit(PG_CONTENDED1, &head->wb_flags)) |
175 | return; | |
2bfc6e56 WAA |
176 | wake_up_bit(&head->wb_flags, PG_HEADLOCK); |
177 | } | |
178 | ||
179 | /* | |
180 | * nfs_page_group_sync_on_bit_locked | |
181 | * | |
182 | * must be called with page group lock held | |
183 | */ | |
184 | static bool | |
185 | nfs_page_group_sync_on_bit_locked(struct nfs_page *req, unsigned int bit) | |
186 | { | |
187 | struct nfs_page *head = req->wb_head; | |
188 | struct nfs_page *tmp; | |
189 | ||
190 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_flags)); | |
191 | WARN_ON_ONCE(test_and_set_bit(bit, &req->wb_flags)); | |
192 | ||
193 | tmp = req->wb_this_page; | |
194 | while (tmp != req) { | |
195 | if (!test_bit(bit, &tmp->wb_flags)) | |
196 | return false; | |
197 | tmp = tmp->wb_this_page; | |
198 | } | |
199 | ||
200 | /* true! reset all bits */ | |
201 | tmp = req; | |
202 | do { | |
203 | clear_bit(bit, &tmp->wb_flags); | |
204 | tmp = tmp->wb_this_page; | |
205 | } while (tmp != req); | |
206 | ||
207 | return true; | |
208 | } | |
209 | ||
210 | /* | |
211 | * nfs_page_group_sync_on_bit - set bit on current request, but only | |
212 | * return true if the bit is set for all requests in page group | |
213 | * @req - request in page group | |
214 | * @bit - PG_* bit that is used to sync page group | |
215 | */ | |
216 | bool nfs_page_group_sync_on_bit(struct nfs_page *req, unsigned int bit) | |
217 | { | |
218 | bool ret; | |
219 | ||
1344b7ea | 220 | nfs_page_group_lock(req); |
2bfc6e56 WAA |
221 | ret = nfs_page_group_sync_on_bit_locked(req, bit); |
222 | nfs_page_group_unlock(req); | |
223 | ||
224 | return ret; | |
225 | } | |
226 | ||
227 | /* | |
228 | * nfs_page_group_init - Initialize the page group linkage for @req | |
229 | * @req - a new nfs request | |
230 | * @prev - the previous request in page group, or NULL if @req is the first | |
231 | * or only request in the group (the head). | |
232 | */ | |
233 | static inline void | |
234 | nfs_page_group_init(struct nfs_page *req, struct nfs_page *prev) | |
235 | { | |
cb1410c7 | 236 | struct inode *inode; |
2bfc6e56 WAA |
237 | WARN_ON_ONCE(prev == req); |
238 | ||
239 | if (!prev) { | |
85710a83 | 240 | /* a head request */ |
2bfc6e56 WAA |
241 | req->wb_head = req; |
242 | req->wb_this_page = req; | |
243 | } else { | |
85710a83 | 244 | /* a subrequest */ |
2bfc6e56 WAA |
245 | WARN_ON_ONCE(prev->wb_this_page != prev->wb_head); |
246 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &prev->wb_head->wb_flags)); | |
247 | req->wb_head = prev->wb_head; | |
248 | req->wb_this_page = prev->wb_this_page; | |
249 | prev->wb_this_page = req; | |
250 | ||
85710a83 WAA |
251 | /* All subrequests take a ref on the head request until |
252 | * nfs_page_group_destroy is called */ | |
253 | kref_get(&req->wb_head->wb_kref); | |
254 | ||
cb1410c7 WAA |
255 | /* grab extra ref and bump the request count if head request |
256 | * has extra ref from the write/commit path to handle handoff | |
257 | * between write and commit lists. */ | |
17089a29 | 258 | if (test_bit(PG_INODE_REF, &prev->wb_head->wb_flags)) { |
cb1410c7 | 259 | inode = page_file_mapping(req->wb_page)->host; |
17089a29 | 260 | set_bit(PG_INODE_REF, &req->wb_flags); |
2bfc6e56 | 261 | kref_get(&req->wb_kref); |
a6b6d5b8 | 262 | atomic_long_inc(&NFS_I(inode)->nrequests); |
17089a29 | 263 | } |
2bfc6e56 WAA |
264 | } |
265 | } | |
266 | ||
267 | /* | |
268 | * nfs_page_group_destroy - sync the destruction of page groups | |
269 | * @req - request that no longer needs the page group | |
270 | * | |
271 | * releases the page group reference from each member once all | |
272 | * members have called this function. | |
273 | */ | |
274 | static void | |
275 | nfs_page_group_destroy(struct kref *kref) | |
276 | { | |
277 | struct nfs_page *req = container_of(kref, struct nfs_page, wb_kref); | |
08fead2a | 278 | struct nfs_page *head = req->wb_head; |
2bfc6e56 WAA |
279 | struct nfs_page *tmp, *next; |
280 | ||
281 | if (!nfs_page_group_sync_on_bit(req, PG_TEARDOWN)) | |
08fead2a | 282 | goto out; |
2bfc6e56 WAA |
283 | |
284 | tmp = req; | |
285 | do { | |
286 | next = tmp->wb_this_page; | |
287 | /* unlink and free */ | |
288 | tmp->wb_this_page = tmp; | |
289 | tmp->wb_head = tmp; | |
290 | nfs_free_request(tmp); | |
291 | tmp = next; | |
292 | } while (tmp != req); | |
08fead2a TM |
293 | out: |
294 | /* subrequests must release the ref on the head request */ | |
295 | if (head != req) | |
296 | nfs_release_request(head); | |
2bfc6e56 WAA |
297 | } |
298 | ||
c917cfaf TM |
299 | static struct nfs_page * |
300 | __nfs_create_request(struct nfs_lock_context *l_ctx, struct page *page, | |
28b1d3f5 TM |
301 | unsigned int pgbase, unsigned int offset, |
302 | unsigned int count) | |
1da177e4 | 303 | { |
1da177e4 | 304 | struct nfs_page *req; |
c917cfaf | 305 | struct nfs_open_context *ctx = l_ctx->open_context; |
1da177e4 | 306 | |
c58c8441 TM |
307 | if (test_bit(NFS_CONTEXT_BAD, &ctx->flags)) |
308 | return ERR_PTR(-EBADF); | |
18eb8842 TM |
309 | /* try to allocate the request struct */ |
310 | req = nfs_page_alloc(); | |
311 | if (req == NULL) | |
312 | return ERR_PTR(-ENOMEM); | |
1da177e4 | 313 | |
b3c54de6 | 314 | req->wb_lock_context = l_ctx; |
c917cfaf | 315 | refcount_inc(&l_ctx->count); |
210c7c17 | 316 | atomic_inc(&l_ctx->io_count); |
015f0212 | 317 | |
1da177e4 LT |
318 | /* Initialize the request struct. Initially, we assume a |
319 | * long write-back delay. This will be adjusted in | |
320 | * update_nfs_request below if the region is not locked. */ | |
321 | req->wb_page = page; | |
67911c8f | 322 | if (page) { |
8cd79788 | 323 | req->wb_index = page_index(page); |
67911c8f AS |
324 | get_page(page); |
325 | } | |
1da177e4 | 326 | req->wb_offset = offset; |
c917cfaf | 327 | req->wb_pgbase = pgbase; |
1da177e4 | 328 | req->wb_bytes = count; |
c03b4024 | 329 | kref_init(&req->wb_kref); |
33344e0f | 330 | req->wb_nio = 0; |
1da177e4 LT |
331 | return req; |
332 | } | |
333 | ||
c917cfaf TM |
334 | /** |
335 | * nfs_create_request - Create an NFS read/write request. | |
336 | * @ctx: open context to use | |
337 | * @page: page to write | |
c917cfaf TM |
338 | * @offset: starting offset within the page for the write |
339 | * @count: number of bytes to read/write | |
340 | * | |
341 | * The page must be locked by the caller. This makes sure we never | |
342 | * create two different requests for the same page. | |
343 | * User should ensure it is safe to sleep in this function. | |
344 | */ | |
345 | struct nfs_page * | |
346 | nfs_create_request(struct nfs_open_context *ctx, struct page *page, | |
28b1d3f5 | 347 | unsigned int offset, unsigned int count) |
c917cfaf TM |
348 | { |
349 | struct nfs_lock_context *l_ctx = nfs_get_lock_context(ctx); | |
350 | struct nfs_page *ret; | |
351 | ||
352 | if (IS_ERR(l_ctx)) | |
353 | return ERR_CAST(l_ctx); | |
28b1d3f5 TM |
354 | ret = __nfs_create_request(l_ctx, page, offset, offset, count); |
355 | if (!IS_ERR(ret)) | |
356 | nfs_page_group_init(ret, NULL); | |
c917cfaf TM |
357 | nfs_put_lock_context(l_ctx); |
358 | return ret; | |
359 | } | |
360 | ||
361 | static struct nfs_page * | |
362 | nfs_create_subreq(struct nfs_page *req, struct nfs_page *last, | |
363 | unsigned int pgbase, unsigned int offset, | |
364 | unsigned int count) | |
365 | { | |
366 | struct nfs_page *ret; | |
367 | ||
28b1d3f5 | 368 | ret = __nfs_create_request(req->wb_lock_context, req->wb_page, |
c917cfaf TM |
369 | pgbase, offset, count); |
370 | if (!IS_ERR(ret)) { | |
371 | nfs_lock_request(ret); | |
372 | ret->wb_index = req->wb_index; | |
28b1d3f5 | 373 | nfs_page_group_init(ret, last); |
33344e0f | 374 | ret->wb_nio = req->wb_nio; |
c917cfaf TM |
375 | } |
376 | return ret; | |
377 | } | |
378 | ||
1da177e4 | 379 | /** |
1d1afcbc | 380 | * nfs_unlock_request - Unlock request and wake up sleepers. |
302fad7b | 381 | * @req: pointer to request |
1da177e4 | 382 | */ |
1d1afcbc | 383 | void nfs_unlock_request(struct nfs_page *req) |
1da177e4 LT |
384 | { |
385 | if (!NFS_WBACK_BUSY(req)) { | |
386 | printk(KERN_ERR "NFS: Invalid unlock attempted\n"); | |
387 | BUG(); | |
388 | } | |
4e857c58 | 389 | smp_mb__before_atomic(); |
1da177e4 | 390 | clear_bit(PG_BUSY, &req->wb_flags); |
4e857c58 | 391 | smp_mb__after_atomic(); |
b4f937cf TM |
392 | if (!test_bit(PG_CONTENDED2, &req->wb_flags)) |
393 | return; | |
464a98bd | 394 | wake_up_bit(&req->wb_flags, PG_BUSY); |
3aff4ebb TM |
395 | } |
396 | ||
397 | /** | |
1d1afcbc | 398 | * nfs_unlock_and_release_request - Unlock request and release the nfs_page |
302fad7b | 399 | * @req: pointer to request |
3aff4ebb | 400 | */ |
1d1afcbc | 401 | void nfs_unlock_and_release_request(struct nfs_page *req) |
3aff4ebb | 402 | { |
1d1afcbc | 403 | nfs_unlock_request(req); |
1da177e4 LT |
404 | nfs_release_request(req); |
405 | } | |
406 | ||
4d65c520 | 407 | /* |
1da177e4 LT |
408 | * nfs_clear_request - Free up all resources allocated to the request |
409 | * @req: | |
410 | * | |
bb6fbc45 TM |
411 | * Release page and open context resources associated with a read/write |
412 | * request after it has completed. | |
1da177e4 | 413 | */ |
4d65c520 | 414 | static void nfs_clear_request(struct nfs_page *req) |
1da177e4 | 415 | { |
cd52ed35 | 416 | struct page *page = req->wb_page; |
f11ac8db | 417 | struct nfs_lock_context *l_ctx = req->wb_lock_context; |
c79d183e | 418 | struct nfs_open_context *ctx; |
bb6fbc45 | 419 | |
cd52ed35 | 420 | if (page != NULL) { |
09cbfeaf | 421 | put_page(page); |
1da177e4 LT |
422 | req->wb_page = NULL; |
423 | } | |
f11ac8db | 424 | if (l_ctx != NULL) { |
7d6ddf88 | 425 | if (atomic_dec_and_test(&l_ctx->io_count)) { |
723c921e | 426 | wake_up_var(&l_ctx->io_count); |
c79d183e | 427 | ctx = l_ctx->open_context; |
7d6ddf88 BC |
428 | if (test_bit(NFS_CONTEXT_UNLOCK, &ctx->flags)) |
429 | rpc_wake_up(&NFS_SERVER(d_inode(ctx->dentry))->uoc_rpcwaitq); | |
430 | } | |
f11ac8db TM |
431 | nfs_put_lock_context(l_ctx); |
432 | req->wb_lock_context = NULL; | |
433 | } | |
1da177e4 LT |
434 | } |
435 | ||
1da177e4 LT |
436 | /** |
437 | * nfs_release_request - Release the count on an NFS read/write request | |
438 | * @req: request to release | |
439 | * | |
440 | * Note: Should never be called with the spinlock held! | |
441 | */ | |
d4581383 | 442 | void nfs_free_request(struct nfs_page *req) |
1da177e4 | 443 | { |
2bfc6e56 WAA |
444 | WARN_ON_ONCE(req->wb_this_page != req); |
445 | ||
446 | /* extra debug: make sure no sync bits are still set */ | |
447 | WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags)); | |
67d0338e WAA |
448 | WARN_ON_ONCE(test_bit(PG_UNLOCKPAGE, &req->wb_flags)); |
449 | WARN_ON_ONCE(test_bit(PG_UPTODATE, &req->wb_flags)); | |
20633f04 WAA |
450 | WARN_ON_ONCE(test_bit(PG_WB_END, &req->wb_flags)); |
451 | WARN_ON_ONCE(test_bit(PG_REMOVE, &req->wb_flags)); | |
1da177e4 | 452 | |
bb6fbc45 | 453 | /* Release struct file and open context */ |
1da177e4 | 454 | nfs_clear_request(req); |
1da177e4 LT |
455 | nfs_page_free(req); |
456 | } | |
457 | ||
c03b4024 TM |
458 | void nfs_release_request(struct nfs_page *req) |
459 | { | |
2bfc6e56 | 460 | kref_put(&req->wb_kref, nfs_page_group_destroy); |
9f557cd8 | 461 | } |
2ce209c4 | 462 | EXPORT_SYMBOL_GPL(nfs_release_request); |
9f557cd8 | 463 | |
1da177e4 LT |
464 | /** |
465 | * nfs_wait_on_request - Wait for a request to complete. | |
466 | * @req: request to wait upon. | |
467 | * | |
150030b7 | 468 | * Interruptible by fatal signals only. |
1da177e4 LT |
469 | * The user is responsible for holding a count on the request. |
470 | */ | |
471 | int | |
472 | nfs_wait_on_request(struct nfs_page *req) | |
473 | { | |
b4f937cf TM |
474 | if (!test_bit(PG_BUSY, &req->wb_flags)) |
475 | return 0; | |
476 | set_bit(PG_CONTENDED2, &req->wb_flags); | |
477 | smp_mb__after_atomic(); | |
74316201 N |
478 | return wait_on_bit_io(&req->wb_flags, PG_BUSY, |
479 | TASK_UNINTERRUPTIBLE); | |
1da177e4 | 480 | } |
2ce209c4 | 481 | EXPORT_SYMBOL_GPL(nfs_wait_on_request); |
1da177e4 | 482 | |
b4fdac1a WAA |
483 | /* |
484 | * nfs_generic_pg_test - determine if requests can be coalesced | |
485 | * @desc: pointer to descriptor | |
486 | * @prev: previous request in desc, or NULL | |
487 | * @req: this request | |
488 | * | |
ac0aa5e8 | 489 | * Returns zero if @req cannot be coalesced into @desc, otherwise it returns |
b4fdac1a WAA |
490 | * the size of the request. |
491 | */ | |
492 | size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc, | |
493 | struct nfs_page *prev, struct nfs_page *req) | |
5b36c7dc | 494 | { |
48d635f1 | 495 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb WAA |
496 | |
497 | ||
498 | if (mirror->pg_count > mirror->pg_bsize) { | |
f0cb9ab8 WAA |
499 | /* should never happen */ |
500 | WARN_ON_ONCE(1); | |
5b36c7dc | 501 | return 0; |
f0cb9ab8 | 502 | } |
5b36c7dc | 503 | |
2e11f829 CH |
504 | /* |
505 | * Limit the request size so that we can still allocate a page array | |
506 | * for it without upsetting the slab allocator. | |
507 | */ | |
a7d42ddb | 508 | if (((mirror->pg_count + req->wb_bytes) >> PAGE_SHIFT) * |
048883e0 | 509 | sizeof(struct page *) > PAGE_SIZE) |
2e11f829 CH |
510 | return 0; |
511 | ||
a7d42ddb | 512 | return min(mirror->pg_bsize - mirror->pg_count, (size_t)req->wb_bytes); |
5b36c7dc | 513 | } |
19345cb2 | 514 | EXPORT_SYMBOL_GPL(nfs_generic_pg_test); |
5b36c7dc | 515 | |
1e7f3a48 | 516 | struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *ops) |
4a0de55c | 517 | { |
1e7f3a48 | 518 | struct nfs_pgio_header *hdr = ops->rw_alloc_header(); |
4a0de55c | 519 | |
1e7f3a48 | 520 | if (hdr) { |
4a0de55c | 521 | INIT_LIST_HEAD(&hdr->pages); |
4a0de55c AS |
522 | hdr->rw_ops = ops; |
523 | } | |
1e7f3a48 | 524 | return hdr; |
4a0de55c | 525 | } |
1e7f3a48 | 526 | EXPORT_SYMBOL_GPL(nfs_pgio_header_alloc); |
4a0de55c | 527 | |
00bfa30a | 528 | /** |
4714fb51 WAA |
529 | * nfs_pgio_data_destroy - make @hdr suitable for reuse |
530 | * | |
531 | * Frees memory and releases refs from nfs_generic_pgio, so that it may | |
532 | * be called again. | |
533 | * | |
534 | * @hdr: A header that has had nfs_generic_pgio called | |
00bfa30a | 535 | */ |
196639eb | 536 | static void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr) |
00bfa30a | 537 | { |
3caa0c6e TM |
538 | if (hdr->args.context) |
539 | put_nfs_open_context(hdr->args.context); | |
d45f60c6 WAA |
540 | if (hdr->page_array.pagevec != hdr->page_array.page_array) |
541 | kfree(hdr->page_array.pagevec); | |
00bfa30a | 542 | } |
196639eb TM |
543 | |
544 | /* | |
545 | * nfs_pgio_header_free - Free a read or write header | |
546 | * @hdr: The header to free | |
547 | */ | |
548 | void nfs_pgio_header_free(struct nfs_pgio_header *hdr) | |
549 | { | |
550 | nfs_pgio_data_destroy(hdr); | |
551 | hdr->rw_ops->rw_free_header(hdr); | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(nfs_pgio_header_free); | |
00bfa30a | 554 | |
ce59515c AS |
555 | /** |
556 | * nfs_pgio_rpcsetup - Set up arguments for a pageio call | |
d45f60c6 | 557 | * @hdr: The pageio hdr |
ce59515c | 558 | * @count: Number of bytes to read |
ce59515c AS |
559 | * @how: How to commit data (writes only) |
560 | * @cinfo: Commit information for the call (writes only) | |
561 | */ | |
d45f60c6 | 562 | static void nfs_pgio_rpcsetup(struct nfs_pgio_header *hdr, |
e545735a | 563 | unsigned int count, |
ce59515c AS |
564 | int how, struct nfs_commit_info *cinfo) |
565 | { | |
d45f60c6 | 566 | struct nfs_page *req = hdr->req; |
ce59515c AS |
567 | |
568 | /* Set up the RPC argument and reply structs | |
d45f60c6 | 569 | * NB: take care not to mess about with hdr->commit et al. */ |
ce59515c | 570 | |
d45f60c6 | 571 | hdr->args.fh = NFS_FH(hdr->inode); |
e545735a | 572 | hdr->args.offset = req_offset(req); |
ce59515c | 573 | /* pnfs_set_layoutcommit needs this */ |
d45f60c6 | 574 | hdr->mds_offset = hdr->args.offset; |
e545735a | 575 | hdr->args.pgbase = req->wb_pgbase; |
d45f60c6 WAA |
576 | hdr->args.pages = hdr->page_array.pagevec; |
577 | hdr->args.count = count; | |
9fcd5960 | 578 | hdr->args.context = get_nfs_open_context(nfs_req_openctx(req)); |
d45f60c6 WAA |
579 | hdr->args.lock_context = req->wb_lock_context; |
580 | hdr->args.stable = NFS_UNSTABLE; | |
ce59515c AS |
581 | switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) { |
582 | case 0: | |
583 | break; | |
584 | case FLUSH_COND_STABLE: | |
585 | if (nfs_reqs_to_commit(cinfo)) | |
586 | break; | |
01e03bdc | 587 | /* fall through */ |
ce59515c | 588 | default: |
d45f60c6 | 589 | hdr->args.stable = NFS_FILE_SYNC; |
ce59515c AS |
590 | } |
591 | ||
d45f60c6 | 592 | hdr->res.fattr = &hdr->fattr; |
17d8c5d1 | 593 | hdr->res.count = 0; |
d45f60c6 | 594 | hdr->res.eof = 0; |
c65e6254 | 595 | hdr->res.verf = &hdr->verf; |
d45f60c6 | 596 | nfs_fattr_init(&hdr->fattr); |
ce59515c AS |
597 | } |
598 | ||
a4cdda59 | 599 | /** |
d45f60c6 | 600 | * nfs_pgio_prepare - Prepare pageio hdr to go over the wire |
a4cdda59 | 601 | * @task: The current task |
d45f60c6 | 602 | * @calldata: pageio header to prepare |
a4cdda59 | 603 | */ |
6f92fa45 | 604 | static void nfs_pgio_prepare(struct rpc_task *task, void *calldata) |
a4cdda59 | 605 | { |
d45f60c6 | 606 | struct nfs_pgio_header *hdr = calldata; |
a4cdda59 | 607 | int err; |
d45f60c6 | 608 | err = NFS_PROTO(hdr->inode)->pgio_rpc_prepare(task, hdr); |
a4cdda59 AS |
609 | if (err) |
610 | rpc_exit(task, err); | |
611 | } | |
612 | ||
d45f60c6 | 613 | int nfs_initiate_pgio(struct rpc_clnt *clnt, struct nfs_pgio_header *hdr, |
a52458b4 | 614 | const struct cred *cred, const struct nfs_rpc_ops *rpc_ops, |
1ed26f33 AS |
615 | const struct rpc_call_ops *call_ops, int how, int flags) |
616 | { | |
617 | struct rpc_task *task; | |
618 | struct rpc_message msg = { | |
d45f60c6 WAA |
619 | .rpc_argp = &hdr->args, |
620 | .rpc_resp = &hdr->res, | |
46a5ab47 | 621 | .rpc_cred = cred, |
1ed26f33 AS |
622 | }; |
623 | struct rpc_task_setup task_setup_data = { | |
624 | .rpc_client = clnt, | |
d45f60c6 | 625 | .task = &hdr->task, |
1ed26f33 AS |
626 | .rpc_message = &msg, |
627 | .callback_ops = call_ops, | |
d45f60c6 | 628 | .callback_data = hdr, |
1ed26f33 AS |
629 | .workqueue = nfsiod_workqueue, |
630 | .flags = RPC_TASK_ASYNC | flags, | |
631 | }; | |
632 | int ret = 0; | |
633 | ||
abde71f4 | 634 | hdr->rw_ops->rw_initiate(hdr, &msg, rpc_ops, &task_setup_data, how); |
1ed26f33 | 635 | |
b4839ebe | 636 | dprintk("NFS: initiated pgio call " |
1ed26f33 | 637 | "(req %s/%llu, %u bytes @ offset %llu)\n", |
343ae531 AS |
638 | hdr->inode->i_sb->s_id, |
639 | (unsigned long long)NFS_FILEID(hdr->inode), | |
d45f60c6 WAA |
640 | hdr->args.count, |
641 | (unsigned long long)hdr->args.offset); | |
1ed26f33 AS |
642 | |
643 | task = rpc_run_task(&task_setup_data); | |
644 | if (IS_ERR(task)) { | |
645 | ret = PTR_ERR(task); | |
646 | goto out; | |
647 | } | |
648 | if (how & FLUSH_SYNC) { | |
649 | ret = rpc_wait_for_completion_task(task); | |
650 | if (ret == 0) | |
651 | ret = task->tk_status; | |
652 | } | |
653 | rpc_put_task(task); | |
654 | out: | |
655 | return ret; | |
656 | } | |
657 | EXPORT_SYMBOL_GPL(nfs_initiate_pgio); | |
658 | ||
844c9e69 AS |
659 | /** |
660 | * nfs_pgio_error - Clean up from a pageio error | |
844c9e69 AS |
661 | * @hdr: pageio header |
662 | */ | |
2bff2288 | 663 | static void nfs_pgio_error(struct nfs_pgio_header *hdr) |
844c9e69 | 664 | { |
844c9e69 | 665 | set_bit(NFS_IOHDR_REDO, &hdr->flags); |
4714fb51 | 666 | hdr->completion_ops->completion(hdr); |
844c9e69 AS |
667 | } |
668 | ||
a4cdda59 AS |
669 | /** |
670 | * nfs_pgio_release - Release pageio data | |
d45f60c6 | 671 | * @calldata: The pageio header to release |
a4cdda59 | 672 | */ |
6f92fa45 | 673 | static void nfs_pgio_release(void *calldata) |
a4cdda59 | 674 | { |
d45f60c6 | 675 | struct nfs_pgio_header *hdr = calldata; |
4714fb51 | 676 | hdr->completion_ops->completion(hdr); |
a4cdda59 AS |
677 | } |
678 | ||
a7d42ddb WAA |
679 | static void nfs_pageio_mirror_init(struct nfs_pgio_mirror *mirror, |
680 | unsigned int bsize) | |
681 | { | |
682 | INIT_LIST_HEAD(&mirror->pg_list); | |
683 | mirror->pg_bytes_written = 0; | |
684 | mirror->pg_count = 0; | |
685 | mirror->pg_bsize = bsize; | |
686 | mirror->pg_base = 0; | |
687 | mirror->pg_recoalesce = 0; | |
688 | } | |
689 | ||
1da177e4 | 690 | /** |
d8a5ad75 TM |
691 | * nfs_pageio_init - initialise a page io descriptor |
692 | * @desc: pointer to descriptor | |
bcb71bba | 693 | * @inode: pointer to inode |
dfad7000 YW |
694 | * @pg_ops: pointer to pageio operations |
695 | * @compl_ops: pointer to pageio completion operations | |
696 | * @rw_ops: pointer to nfs read/write operations | |
bcb71bba TM |
697 | * @bsize: io block size |
698 | * @io_flags: extra parameters for the io function | |
d8a5ad75 | 699 | */ |
bcb71bba TM |
700 | void nfs_pageio_init(struct nfs_pageio_descriptor *desc, |
701 | struct inode *inode, | |
1751c363 | 702 | const struct nfs_pageio_ops *pg_ops, |
061ae2ed | 703 | const struct nfs_pgio_completion_ops *compl_ops, |
4a0de55c | 704 | const struct nfs_rw_ops *rw_ops, |
84dde76c | 705 | size_t bsize, |
3bde7afd | 706 | int io_flags) |
d8a5ad75 | 707 | { |
b31268ac | 708 | desc->pg_moreio = 0; |
bcb71bba | 709 | desc->pg_inode = inode; |
1751c363 | 710 | desc->pg_ops = pg_ops; |
061ae2ed | 711 | desc->pg_completion_ops = compl_ops; |
4a0de55c | 712 | desc->pg_rw_ops = rw_ops; |
bcb71bba TM |
713 | desc->pg_ioflags = io_flags; |
714 | desc->pg_error = 0; | |
94ad1c80 | 715 | desc->pg_lseg = NULL; |
919e3bd9 | 716 | desc->pg_io_completion = NULL; |
584aa810 | 717 | desc->pg_dreq = NULL; |
a7d42ddb WAA |
718 | desc->pg_bsize = bsize; |
719 | ||
720 | desc->pg_mirror_count = 1; | |
721 | desc->pg_mirror_idx = 0; | |
722 | ||
14abcb0b TM |
723 | desc->pg_mirrors_dynamic = NULL; |
724 | desc->pg_mirrors = desc->pg_mirrors_static; | |
725 | nfs_pageio_mirror_init(&desc->pg_mirrors[0], bsize); | |
33344e0f | 726 | desc->pg_maxretrans = 0; |
d8a5ad75 TM |
727 | } |
728 | ||
0eecb214 AS |
729 | /** |
730 | * nfs_pgio_result - Basic pageio error handling | |
731 | * @task: The task that ran | |
d45f60c6 | 732 | * @calldata: Pageio header to check |
0eecb214 | 733 | */ |
6f92fa45 | 734 | static void nfs_pgio_result(struct rpc_task *task, void *calldata) |
0eecb214 | 735 | { |
d45f60c6 WAA |
736 | struct nfs_pgio_header *hdr = calldata; |
737 | struct inode *inode = hdr->inode; | |
0eecb214 AS |
738 | |
739 | dprintk("NFS: %s: %5u, (status %d)\n", __func__, | |
740 | task->tk_pid, task->tk_status); | |
741 | ||
d45f60c6 | 742 | if (hdr->rw_ops->rw_done(task, hdr, inode) != 0) |
0eecb214 AS |
743 | return; |
744 | if (task->tk_status < 0) | |
d45f60c6 | 745 | nfs_set_pgio_error(hdr, task->tk_status, hdr->args.offset); |
0eecb214 | 746 | else |
d45f60c6 | 747 | hdr->rw_ops->rw_result(task, hdr); |
0eecb214 AS |
748 | } |
749 | ||
ef2c488c AS |
750 | /* |
751 | * Create an RPC task for the given read or write request and kick it. | |
752 | * The page must have been locked by the caller. | |
753 | * | |
754 | * It may happen that the page we're passed is not marked dirty. | |
755 | * This is the case if nfs_updatepage detects a conflicting request | |
756 | * that has been written but not committed. | |
757 | */ | |
f0cb9ab8 WAA |
758 | int nfs_generic_pgio(struct nfs_pageio_descriptor *desc, |
759 | struct nfs_pgio_header *hdr) | |
ef2c488c | 760 | { |
48d635f1 | 761 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb | 762 | |
ef2c488c | 763 | struct nfs_page *req; |
bba5c188 WAA |
764 | struct page **pages, |
765 | *last_page; | |
a7d42ddb | 766 | struct list_head *head = &mirror->pg_list; |
ef2c488c | 767 | struct nfs_commit_info cinfo; |
8ef9b0b9 | 768 | struct nfs_page_array *pg_array = &hdr->page_array; |
bba5c188 | 769 | unsigned int pagecount, pageused; |
ae97aa52 | 770 | gfp_t gfp_flags = GFP_KERNEL; |
ef2c488c | 771 | |
a7d42ddb | 772 | pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count); |
2eb3aea7 | 773 | pg_array->npages = pagecount; |
8ef9b0b9 BC |
774 | |
775 | if (pagecount <= ARRAY_SIZE(pg_array->page_array)) | |
776 | pg_array->pagevec = pg_array->page_array; | |
777 | else { | |
8ef9b0b9 BC |
778 | pg_array->pagevec = kcalloc(pagecount, sizeof(struct page *), gfp_flags); |
779 | if (!pg_array->pagevec) { | |
780 | pg_array->npages = 0; | |
781 | nfs_pgio_error(hdr); | |
782 | desc->pg_error = -ENOMEM; | |
783 | return desc->pg_error; | |
784 | } | |
2bff2288 | 785 | } |
ef2c488c AS |
786 | |
787 | nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq); | |
d45f60c6 | 788 | pages = hdr->page_array.pagevec; |
bba5c188 WAA |
789 | last_page = NULL; |
790 | pageused = 0; | |
ef2c488c AS |
791 | while (!list_empty(head)) { |
792 | req = nfs_list_entry(head->next); | |
078b5fd9 | 793 | nfs_list_move_request(req, &hdr->pages); |
bba5c188 | 794 | |
bba5c188 | 795 | if (!last_page || last_page != req->wb_page) { |
bba5c188 | 796 | pageused++; |
b8fb9c30 TM |
797 | if (pageused > pagecount) |
798 | break; | |
799 | *pages++ = last_page = req->wb_page; | |
bba5c188 | 800 | } |
ef2c488c | 801 | } |
2bff2288 PT |
802 | if (WARN_ON_ONCE(pageused != pagecount)) { |
803 | nfs_pgio_error(hdr); | |
804 | desc->pg_error = -EINVAL; | |
805 | return desc->pg_error; | |
806 | } | |
ef2c488c AS |
807 | |
808 | if ((desc->pg_ioflags & FLUSH_COND_STABLE) && | |
809 | (desc->pg_moreio || nfs_reqs_to_commit(&cinfo))) | |
810 | desc->pg_ioflags &= ~FLUSH_COND_STABLE; | |
811 | ||
812 | /* Set up the argument struct */ | |
e545735a | 813 | nfs_pgio_rpcsetup(hdr, mirror->pg_count, desc->pg_ioflags, &cinfo); |
ef2c488c AS |
814 | desc->pg_rpc_callops = &nfs_pgio_common_ops; |
815 | return 0; | |
816 | } | |
f0cb9ab8 | 817 | EXPORT_SYMBOL_GPL(nfs_generic_pgio); |
ef2c488c | 818 | |
41d8d5b7 | 819 | static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc) |
cf485fcd | 820 | { |
cf485fcd AS |
821 | struct nfs_pgio_header *hdr; |
822 | int ret; | |
823 | ||
1e7f3a48 WAA |
824 | hdr = nfs_pgio_header_alloc(desc->pg_rw_ops); |
825 | if (!hdr) { | |
2bff2288 PT |
826 | desc->pg_error = -ENOMEM; |
827 | return desc->pg_error; | |
cf485fcd | 828 | } |
1e7f3a48 | 829 | nfs_pgheader_init(desc, hdr, nfs_pgio_header_free); |
cf485fcd AS |
830 | ret = nfs_generic_pgio(desc, hdr); |
831 | if (ret == 0) | |
7f714720 | 832 | ret = nfs_initiate_pgio(NFS_CLIENT(hdr->inode), |
46a5ab47 PT |
833 | hdr, |
834 | hdr->cred, | |
835 | NFS_PROTO(hdr->inode), | |
abde71f4 | 836 | desc->pg_rpc_callops, |
7f714720 | 837 | desc->pg_ioflags, 0); |
cf485fcd AS |
838 | return ret; |
839 | } | |
840 | ||
14abcb0b TM |
841 | static struct nfs_pgio_mirror * |
842 | nfs_pageio_alloc_mirrors(struct nfs_pageio_descriptor *desc, | |
843 | unsigned int mirror_count) | |
844 | { | |
845 | struct nfs_pgio_mirror *ret; | |
846 | unsigned int i; | |
847 | ||
848 | kfree(desc->pg_mirrors_dynamic); | |
849 | desc->pg_mirrors_dynamic = NULL; | |
850 | if (mirror_count == 1) | |
851 | return desc->pg_mirrors_static; | |
2b17d725 | 852 | ret = kmalloc_array(mirror_count, sizeof(*ret), GFP_KERNEL); |
14abcb0b TM |
853 | if (ret != NULL) { |
854 | for (i = 0; i < mirror_count; i++) | |
855 | nfs_pageio_mirror_init(&ret[i], desc->pg_bsize); | |
856 | desc->pg_mirrors_dynamic = ret; | |
857 | } | |
858 | return ret; | |
859 | } | |
860 | ||
a7d42ddb WAA |
861 | /* |
862 | * nfs_pageio_setup_mirroring - determine if mirroring is to be used | |
863 | * by calling the pg_get_mirror_count op | |
864 | */ | |
14abcb0b | 865 | static void nfs_pageio_setup_mirroring(struct nfs_pageio_descriptor *pgio, |
a7d42ddb WAA |
866 | struct nfs_page *req) |
867 | { | |
14abcb0b | 868 | unsigned int mirror_count = 1; |
a7d42ddb | 869 | |
14abcb0b TM |
870 | if (pgio->pg_ops->pg_get_mirror_count) |
871 | mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req); | |
872 | if (mirror_count == pgio->pg_mirror_count || pgio->pg_error < 0) | |
873 | return; | |
a7d42ddb | 874 | |
14abcb0b TM |
875 | if (!mirror_count || mirror_count > NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX) { |
876 | pgio->pg_error = -EINVAL; | |
877 | return; | |
878 | } | |
a7d42ddb | 879 | |
14abcb0b TM |
880 | pgio->pg_mirrors = nfs_pageio_alloc_mirrors(pgio, mirror_count); |
881 | if (pgio->pg_mirrors == NULL) { | |
882 | pgio->pg_error = -ENOMEM; | |
883 | pgio->pg_mirrors = pgio->pg_mirrors_static; | |
884 | mirror_count = 1; | |
885 | } | |
a7d42ddb | 886 | pgio->pg_mirror_count = mirror_count; |
a7d42ddb WAA |
887 | } |
888 | ||
889 | /* | |
890 | * nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1) | |
891 | */ | |
892 | void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio) | |
893 | { | |
894 | pgio->pg_mirror_count = 1; | |
895 | pgio->pg_mirror_idx = 0; | |
896 | } | |
897 | ||
898 | static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio) | |
899 | { | |
900 | pgio->pg_mirror_count = 1; | |
901 | pgio->pg_mirror_idx = 0; | |
902 | pgio->pg_mirrors = pgio->pg_mirrors_static; | |
903 | kfree(pgio->pg_mirrors_dynamic); | |
904 | pgio->pg_mirrors_dynamic = NULL; | |
905 | } | |
906 | ||
4109bb74 TM |
907 | static bool nfs_match_lock_context(const struct nfs_lock_context *l1, |
908 | const struct nfs_lock_context *l2) | |
909 | { | |
d51fdb87 | 910 | return l1->lockowner == l2->lockowner; |
4109bb74 TM |
911 | } |
912 | ||
d8a5ad75 TM |
913 | /** |
914 | * nfs_can_coalesce_requests - test two requests for compatibility | |
915 | * @prev: pointer to nfs_page | |
916 | * @req: pointer to nfs_page | |
302fad7b | 917 | * @pgio: pointer to nfs_pagio_descriptor |
d8a5ad75 TM |
918 | * |
919 | * The nfs_page structures 'prev' and 'req' are compared to ensure that the | |
920 | * page data area they describe is contiguous, and that their RPC | |
921 | * credentials, NFSv4 open state, and lockowners are the same. | |
922 | * | |
923 | * Return 'true' if this is the case, else return 'false'. | |
924 | */ | |
18ad0a9f BH |
925 | static bool nfs_can_coalesce_requests(struct nfs_page *prev, |
926 | struct nfs_page *req, | |
927 | struct nfs_pageio_descriptor *pgio) | |
d8a5ad75 | 928 | { |
b4fdac1a | 929 | size_t size; |
5263e31e | 930 | struct file_lock_context *flctx; |
b4fdac1a | 931 | |
ab75e417 | 932 | if (prev) { |
9fcd5960 | 933 | if (!nfs_match_open_context(nfs_req_openctx(req), nfs_req_openctx(prev))) |
ab75e417 | 934 | return false; |
9fcd5960 | 935 | flctx = d_inode(nfs_req_openctx(req)->dentry)->i_flctx; |
bd61e0a9 JL |
936 | if (flctx != NULL && |
937 | !(list_empty_careful(&flctx->flc_posix) && | |
938 | list_empty_careful(&flctx->flc_flock)) && | |
5263e31e JL |
939 | !nfs_match_lock_context(req->wb_lock_context, |
940 | prev->wb_lock_context)) | |
941 | return false; | |
ab75e417 WAA |
942 | if (req_offset(req) != req_offset(prev) + prev->wb_bytes) |
943 | return false; | |
78270e8f WAA |
944 | if (req->wb_page == prev->wb_page) { |
945 | if (req->wb_pgbase != prev->wb_pgbase + prev->wb_bytes) | |
946 | return false; | |
947 | } else { | |
948 | if (req->wb_pgbase != 0 || | |
09cbfeaf | 949 | prev->wb_pgbase + prev->wb_bytes != PAGE_SIZE) |
78270e8f WAA |
950 | return false; |
951 | } | |
ab75e417 | 952 | } |
b4fdac1a | 953 | size = pgio->pg_ops->pg_test(pgio, prev, req); |
f0cb9ab8 WAA |
954 | WARN_ON_ONCE(size > req->wb_bytes); |
955 | if (size && size < req->wb_bytes) | |
956 | req->wb_bytes = size; | |
b4fdac1a | 957 | return size > 0; |
d8a5ad75 TM |
958 | } |
959 | ||
960 | /** | |
bcb71bba | 961 | * nfs_pageio_do_add_request - Attempt to coalesce a request into a page list. |
d8a5ad75 TM |
962 | * @desc: destination io descriptor |
963 | * @req: request | |
964 | * | |
965 | * Returns true if the request 'req' was successfully coalesced into the | |
966 | * existing list of pages 'desc'. | |
967 | */ | |
bcb71bba TM |
968 | static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc, |
969 | struct nfs_page *req) | |
d8a5ad75 | 970 | { |
48d635f1 | 971 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb | 972 | |
ab75e417 | 973 | struct nfs_page *prev = NULL; |
a7d42ddb WAA |
974 | |
975 | if (mirror->pg_count != 0) { | |
976 | prev = nfs_list_entry(mirror->pg_list.prev); | |
5b36c7dc | 977 | } else { |
d8007d4d TM |
978 | if (desc->pg_ops->pg_init) |
979 | desc->pg_ops->pg_init(desc, req); | |
d600ad1f PT |
980 | if (desc->pg_error < 0) |
981 | return 0; | |
a7d42ddb | 982 | mirror->pg_base = req->wb_pgbase; |
5b36c7dc | 983 | } |
33344e0f TM |
984 | |
985 | if (desc->pg_maxretrans && req->wb_nio > desc->pg_maxretrans) { | |
986 | if (NFS_SERVER(desc->pg_inode)->flags & NFS_MOUNT_SOFTERR) | |
987 | desc->pg_error = -ETIMEDOUT; | |
988 | else | |
989 | desc->pg_error = -EIO; | |
990 | return 0; | |
991 | } | |
992 | ||
ab75e417 WAA |
993 | if (!nfs_can_coalesce_requests(prev, req, desc)) |
994 | return 0; | |
078b5fd9 | 995 | nfs_list_move_request(req, &mirror->pg_list); |
a7d42ddb | 996 | mirror->pg_count += req->wb_bytes; |
d8a5ad75 TM |
997 | return 1; |
998 | } | |
999 | ||
bcb71bba TM |
1000 | /* |
1001 | * Helper for nfs_pageio_add_request and nfs_pageio_complete | |
1002 | */ | |
1003 | static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc) | |
1004 | { | |
48d635f1 | 1005 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb WAA |
1006 | |
1007 | ||
1008 | if (!list_empty(&mirror->pg_list)) { | |
1751c363 | 1009 | int error = desc->pg_ops->pg_doio(desc); |
bcb71bba TM |
1010 | if (error < 0) |
1011 | desc->pg_error = error; | |
1012 | else | |
a7d42ddb | 1013 | mirror->pg_bytes_written += mirror->pg_count; |
bcb71bba | 1014 | } |
a7d42ddb WAA |
1015 | if (list_empty(&mirror->pg_list)) { |
1016 | mirror->pg_count = 0; | |
1017 | mirror->pg_base = 0; | |
bcb71bba TM |
1018 | } |
1019 | } | |
1020 | ||
f57dcf4c TM |
1021 | static void |
1022 | nfs_pageio_cleanup_request(struct nfs_pageio_descriptor *desc, | |
1023 | struct nfs_page *req) | |
1024 | { | |
1025 | LIST_HEAD(head); | |
1026 | ||
078b5fd9 | 1027 | nfs_list_move_request(req, &head); |
df3accb8 | 1028 | desc->pg_completion_ops->error_cleanup(&head, desc->pg_error); |
f57dcf4c TM |
1029 | } |
1030 | ||
bcb71bba TM |
1031 | /** |
1032 | * nfs_pageio_add_request - Attempt to coalesce a request into a page list. | |
1033 | * @desc: destination io descriptor | |
1034 | * @req: request | |
1035 | * | |
2bfc6e56 WAA |
1036 | * This may split a request into subrequests which are all part of the |
1037 | * same page group. | |
1038 | * | |
bcb71bba TM |
1039 | * Returns true if the request 'req' was successfully coalesced into the |
1040 | * existing list of pages 'desc'. | |
1041 | */ | |
d9156f9f | 1042 | static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc, |
8b09bee3 | 1043 | struct nfs_page *req) |
bcb71bba | 1044 | { |
48d635f1 | 1045 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
a7d42ddb | 1046 | |
2bfc6e56 WAA |
1047 | struct nfs_page *subreq; |
1048 | unsigned int bytes_left = 0; | |
1049 | unsigned int offset, pgbase; | |
1050 | ||
1344b7ea | 1051 | nfs_page_group_lock(req); |
2bfc6e56 WAA |
1052 | |
1053 | subreq = req; | |
1054 | bytes_left = subreq->wb_bytes; | |
1055 | offset = subreq->wb_offset; | |
1056 | pgbase = subreq->wb_pgbase; | |
1057 | ||
1058 | do { | |
1059 | if (!nfs_pageio_do_add_request(desc, subreq)) { | |
1060 | /* make sure pg_test call(s) did nothing */ | |
1061 | WARN_ON_ONCE(subreq->wb_bytes != bytes_left); | |
1062 | WARN_ON_ONCE(subreq->wb_offset != offset); | |
1063 | WARN_ON_ONCE(subreq->wb_pgbase != pgbase); | |
1064 | ||
1065 | nfs_page_group_unlock(req); | |
1066 | desc->pg_moreio = 1; | |
1067 | nfs_pageio_doio(desc); | |
f57dcf4c TM |
1068 | if (desc->pg_error < 0 || mirror->pg_recoalesce) |
1069 | goto out_cleanup_subreq; | |
2bfc6e56 | 1070 | /* retry add_request for this subreq */ |
1344b7ea | 1071 | nfs_page_group_lock(req); |
2bfc6e56 WAA |
1072 | continue; |
1073 | } | |
1074 | ||
1075 | /* check for buggy pg_test call(s) */ | |
1076 | WARN_ON_ONCE(subreq->wb_bytes + subreq->wb_pgbase > PAGE_SIZE); | |
1077 | WARN_ON_ONCE(subreq->wb_bytes > bytes_left); | |
1078 | WARN_ON_ONCE(subreq->wb_bytes == 0); | |
1079 | ||
1080 | bytes_left -= subreq->wb_bytes; | |
1081 | offset += subreq->wb_bytes; | |
1082 | pgbase += subreq->wb_bytes; | |
1083 | ||
1084 | if (bytes_left) { | |
c917cfaf TM |
1085 | subreq = nfs_create_subreq(req, subreq, pgbase, |
1086 | offset, bytes_left); | |
c1109558 TM |
1087 | if (IS_ERR(subreq)) |
1088 | goto err_ptr; | |
2bfc6e56 WAA |
1089 | } |
1090 | } while (bytes_left > 0); | |
1091 | ||
1092 | nfs_page_group_unlock(req); | |
bcb71bba | 1093 | return 1; |
c1109558 TM |
1094 | err_ptr: |
1095 | desc->pg_error = PTR_ERR(subreq); | |
1096 | nfs_page_group_unlock(req); | |
1097 | return 0; | |
f57dcf4c TM |
1098 | out_cleanup_subreq: |
1099 | if (req != subreq) | |
1100 | nfs_pageio_cleanup_request(desc, subreq); | |
1101 | return 0; | |
bcb71bba TM |
1102 | } |
1103 | ||
d9156f9f TM |
1104 | static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc) |
1105 | { | |
48d635f1 | 1106 | struct nfs_pgio_mirror *mirror = nfs_pgio_current_mirror(desc); |
d9156f9f TM |
1107 | LIST_HEAD(head); |
1108 | ||
1109 | do { | |
a7d42ddb WAA |
1110 | list_splice_init(&mirror->pg_list, &head); |
1111 | mirror->pg_bytes_written -= mirror->pg_count; | |
1112 | mirror->pg_count = 0; | |
1113 | mirror->pg_base = 0; | |
1114 | mirror->pg_recoalesce = 0; | |
1115 | ||
d9156f9f TM |
1116 | while (!list_empty(&head)) { |
1117 | struct nfs_page *req; | |
1118 | ||
1119 | req = list_first_entry(&head, struct nfs_page, wb_list); | |
d9156f9f TM |
1120 | if (__nfs_pageio_add_request(desc, req)) |
1121 | continue; | |
03d5eb65 TM |
1122 | if (desc->pg_error < 0) { |
1123 | list_splice_tail(&head, &mirror->pg_list); | |
1124 | mirror->pg_recoalesce = 1; | |
d9156f9f | 1125 | return 0; |
03d5eb65 | 1126 | } |
d9156f9f TM |
1127 | break; |
1128 | } | |
a7d42ddb | 1129 | } while (mirror->pg_recoalesce); |
d9156f9f TM |
1130 | return 1; |
1131 | } | |
1132 | ||
a7d42ddb | 1133 | static int nfs_pageio_add_request_mirror(struct nfs_pageio_descriptor *desc, |
d9156f9f TM |
1134 | struct nfs_page *req) |
1135 | { | |
1136 | int ret; | |
1137 | ||
1138 | do { | |
1139 | ret = __nfs_pageio_add_request(desc, req); | |
1140 | if (ret) | |
1141 | break; | |
1142 | if (desc->pg_error < 0) | |
1143 | break; | |
1144 | ret = nfs_do_recoalesce(desc); | |
1145 | } while (ret); | |
a7d42ddb | 1146 | |
d9156f9f TM |
1147 | return ret; |
1148 | } | |
1149 | ||
fdbd1a2e BC |
1150 | static void nfs_pageio_error_cleanup(struct nfs_pageio_descriptor *desc) |
1151 | { | |
1152 | u32 midx; | |
1153 | struct nfs_pgio_mirror *mirror; | |
1154 | ||
1155 | if (!desc->pg_error) | |
1156 | return; | |
1157 | ||
1158 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { | |
1159 | mirror = &desc->pg_mirrors[midx]; | |
df3accb8 TM |
1160 | desc->pg_completion_ops->error_cleanup(&mirror->pg_list, |
1161 | desc->pg_error); | |
fdbd1a2e BC |
1162 | } |
1163 | } | |
1164 | ||
a7d42ddb WAA |
1165 | int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc, |
1166 | struct nfs_page *req) | |
1167 | { | |
1168 | u32 midx; | |
1169 | unsigned int pgbase, offset, bytes; | |
1170 | struct nfs_page *dupreq, *lastreq; | |
1171 | ||
1172 | pgbase = req->wb_pgbase; | |
1173 | offset = req->wb_offset; | |
1174 | bytes = req->wb_bytes; | |
1175 | ||
1176 | nfs_pageio_setup_mirroring(desc, req); | |
d600ad1f | 1177 | if (desc->pg_error < 0) |
c18b96a1 | 1178 | goto out_failed; |
a7d42ddb WAA |
1179 | |
1180 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { | |
1181 | if (midx) { | |
1344b7ea | 1182 | nfs_page_group_lock(req); |
a7d42ddb WAA |
1183 | |
1184 | /* find the last request */ | |
1185 | for (lastreq = req->wb_head; | |
1186 | lastreq->wb_this_page != req->wb_head; | |
1187 | lastreq = lastreq->wb_this_page) | |
1188 | ; | |
1189 | ||
c917cfaf TM |
1190 | dupreq = nfs_create_subreq(req, lastreq, |
1191 | pgbase, offset, bytes); | |
a7d42ddb | 1192 | |
c917cfaf | 1193 | nfs_page_group_unlock(req); |
a7d42ddb | 1194 | if (IS_ERR(dupreq)) { |
c18b96a1 PT |
1195 | desc->pg_error = PTR_ERR(dupreq); |
1196 | goto out_failed; | |
a7d42ddb | 1197 | } |
a7d42ddb WAA |
1198 | } else |
1199 | dupreq = req; | |
1200 | ||
47af81f2 PT |
1201 | if (nfs_pgio_has_mirroring(desc)) |
1202 | desc->pg_mirror_idx = midx; | |
a7d42ddb | 1203 | if (!nfs_pageio_add_request_mirror(desc, dupreq)) |
f57dcf4c | 1204 | goto out_cleanup_subreq; |
a7d42ddb WAA |
1205 | } |
1206 | ||
1207 | return 1; | |
c18b96a1 | 1208 | |
f57dcf4c TM |
1209 | out_cleanup_subreq: |
1210 | if (req != dupreq) | |
1211 | nfs_pageio_cleanup_request(desc, dupreq); | |
c18b96a1 | 1212 | out_failed: |
fdbd1a2e | 1213 | nfs_pageio_error_cleanup(desc); |
c18b96a1 | 1214 | return 0; |
a7d42ddb WAA |
1215 | } |
1216 | ||
1217 | /* | |
1218 | * nfs_pageio_complete_mirror - Complete I/O on the current mirror of an | |
1219 | * nfs_pageio_descriptor | |
1220 | * @desc: pointer to io descriptor | |
dfad7000 | 1221 | * @mirror_idx: pointer to mirror index |
a7d42ddb WAA |
1222 | */ |
1223 | static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc, | |
1224 | u32 mirror_idx) | |
1225 | { | |
1226 | struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[mirror_idx]; | |
1227 | u32 restore_idx = desc->pg_mirror_idx; | |
1228 | ||
47af81f2 PT |
1229 | if (nfs_pgio_has_mirroring(desc)) |
1230 | desc->pg_mirror_idx = mirror_idx; | |
a7d42ddb WAA |
1231 | for (;;) { |
1232 | nfs_pageio_doio(desc); | |
8127d827 | 1233 | if (desc->pg_error < 0 || !mirror->pg_recoalesce) |
a7d42ddb WAA |
1234 | break; |
1235 | if (!nfs_do_recoalesce(desc)) | |
1236 | break; | |
1237 | } | |
1238 | desc->pg_mirror_idx = restore_idx; | |
1239 | } | |
1240 | ||
53113ad3 WAA |
1241 | /* |
1242 | * nfs_pageio_resend - Transfer requests to new descriptor and resend | |
1243 | * @hdr - the pgio header to move request from | |
1244 | * @desc - the pageio descriptor to add requests to | |
1245 | * | |
1246 | * Try to move each request (nfs_page) from @hdr to @desc then attempt | |
1247 | * to send them. | |
1248 | * | |
1249 | * Returns 0 on success and < 0 on error. | |
1250 | */ | |
1251 | int nfs_pageio_resend(struct nfs_pageio_descriptor *desc, | |
1252 | struct nfs_pgio_header *hdr) | |
1253 | { | |
f4340e93 | 1254 | LIST_HEAD(pages); |
53113ad3 | 1255 | |
919e3bd9 | 1256 | desc->pg_io_completion = hdr->io_completion; |
53113ad3 | 1257 | desc->pg_dreq = hdr->dreq; |
f4340e93 TM |
1258 | list_splice_init(&hdr->pages, &pages); |
1259 | while (!list_empty(&pages)) { | |
1260 | struct nfs_page *req = nfs_list_entry(pages.next); | |
53113ad3 | 1261 | |
53113ad3 | 1262 | if (!nfs_pageio_add_request(desc, req)) |
f4340e93 | 1263 | break; |
53113ad3 WAA |
1264 | } |
1265 | nfs_pageio_complete(desc); | |
f4340e93 TM |
1266 | if (!list_empty(&pages)) { |
1267 | int err = desc->pg_error < 0 ? desc->pg_error : -EIO; | |
1268 | hdr->completion_ops->error_cleanup(&pages, err); | |
eb2c50da | 1269 | nfs_set_pgio_error(hdr, err, hdr->io_start); |
f4340e93 | 1270 | return err; |
53113ad3 WAA |
1271 | } |
1272 | return 0; | |
1273 | } | |
1274 | EXPORT_SYMBOL_GPL(nfs_pageio_resend); | |
d9156f9f | 1275 | |
bcb71bba | 1276 | /** |
2176bf42 | 1277 | * nfs_pageio_complete - Complete I/O then cleanup an nfs_pageio_descriptor |
bcb71bba TM |
1278 | * @desc: pointer to io descriptor |
1279 | */ | |
1280 | void nfs_pageio_complete(struct nfs_pageio_descriptor *desc) | |
1281 | { | |
a7d42ddb WAA |
1282 | u32 midx; |
1283 | ||
1284 | for (midx = 0; midx < desc->pg_mirror_count; midx++) | |
1285 | nfs_pageio_complete_mirror(desc, midx); | |
2176bf42 | 1286 | |
fdbd1a2e BC |
1287 | if (desc->pg_error < 0) |
1288 | nfs_pageio_error_cleanup(desc); | |
2176bf42 WAA |
1289 | if (desc->pg_ops->pg_cleanup) |
1290 | desc->pg_ops->pg_cleanup(desc); | |
a7d42ddb | 1291 | nfs_pageio_cleanup_mirroring(desc); |
bcb71bba TM |
1292 | } |
1293 | ||
7fe7f848 TM |
1294 | /** |
1295 | * nfs_pageio_cond_complete - Conditional I/O completion | |
1296 | * @desc: pointer to io descriptor | |
1297 | * @index: page index | |
1298 | * | |
1299 | * It is important to ensure that processes don't try to take locks | |
1300 | * on non-contiguous ranges of pages as that might deadlock. This | |
1301 | * function should be called before attempting to wait on a locked | |
1302 | * nfs_page. It will complete the I/O if the page index 'index' | |
1303 | * is not contiguous with the existing list of pages in 'desc'. | |
1304 | */ | |
1305 | void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index) | |
1306 | { | |
a7d42ddb WAA |
1307 | struct nfs_pgio_mirror *mirror; |
1308 | struct nfs_page *prev; | |
1309 | u32 midx; | |
1310 | ||
1311 | for (midx = 0; midx < desc->pg_mirror_count; midx++) { | |
1312 | mirror = &desc->pg_mirrors[midx]; | |
1313 | if (!list_empty(&mirror->pg_list)) { | |
1314 | prev = nfs_list_entry(mirror->pg_list.prev); | |
43b7d964 BC |
1315 | if (index != prev->wb_index + 1) { |
1316 | nfs_pageio_complete(desc); | |
1317 | break; | |
1318 | } | |
a7d42ddb | 1319 | } |
7fe7f848 TM |
1320 | } |
1321 | } | |
1322 | ||
f7b422b1 | 1323 | int __init nfs_init_nfspagecache(void) |
1da177e4 LT |
1324 | { |
1325 | nfs_page_cachep = kmem_cache_create("nfs_page", | |
1326 | sizeof(struct nfs_page), | |
1327 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1328 | NULL); |
1da177e4 LT |
1329 | if (nfs_page_cachep == NULL) |
1330 | return -ENOMEM; | |
1331 | ||
1332 | return 0; | |
1333 | } | |
1334 | ||
266bee88 | 1335 | void nfs_destroy_nfspagecache(void) |
1da177e4 | 1336 | { |
1a1d92c1 | 1337 | kmem_cache_destroy(nfs_page_cachep); |
1da177e4 LT |
1338 | } |
1339 | ||
ef2c488c | 1340 | static const struct rpc_call_ops nfs_pgio_common_ops = { |
6f92fa45 AS |
1341 | .rpc_call_prepare = nfs_pgio_prepare, |
1342 | .rpc_call_done = nfs_pgio_result, | |
1343 | .rpc_release = nfs_pgio_release, | |
1344 | }; | |
41d8d5b7 AS |
1345 | |
1346 | const struct nfs_pageio_ops nfs_pgio_rw_ops = { | |
1347 | .pg_test = nfs_generic_pg_test, | |
1348 | .pg_doio = nfs_generic_pg_pgios, | |
1349 | }; |