Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/write.c | |
3 | * | |
7c85d900 | 4 | * Write file data over NFS. |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de> | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/types.h> |
10 | #include <linux/slab.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/file.h> | |
1da177e4 | 14 | #include <linux/writeback.h> |
89a09141 | 15 | #include <linux/swap.h> |
074cc1de | 16 | #include <linux/migrate.h> |
1da177e4 LT |
17 | |
18 | #include <linux/sunrpc/clnt.h> | |
19 | #include <linux/nfs_fs.h> | |
20 | #include <linux/nfs_mount.h> | |
21 | #include <linux/nfs_page.h> | |
3fcfab16 | 22 | #include <linux/backing-dev.h> |
afeacc8c | 23 | #include <linux/export.h> |
3fcfab16 | 24 | |
1da177e4 | 25 | #include <asm/uaccess.h> |
1da177e4 LT |
26 | |
27 | #include "delegation.h" | |
49a70f27 | 28 | #include "internal.h" |
91d5b470 | 29 | #include "iostat.h" |
def6ed7e | 30 | #include "nfs4_fs.h" |
074cc1de | 31 | #include "fscache.h" |
94ad1c80 | 32 | #include "pnfs.h" |
1da177e4 | 33 | |
f4ce1299 TM |
34 | #include "nfstrace.h" |
35 | ||
1da177e4 LT |
36 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE |
37 | ||
38 | #define MIN_POOL_WRITE (32) | |
39 | #define MIN_POOL_COMMIT (4) | |
40 | ||
41 | /* | |
42 | * Local function declarations | |
43 | */ | |
f8512ad0 | 44 | static void nfs_redirty_request(struct nfs_page *req); |
788e7a89 | 45 | static const struct rpc_call_ops nfs_commit_ops; |
061ae2ed | 46 | static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops; |
f453a54a | 47 | static const struct nfs_commit_completion_ops nfs_commit_completion_ops; |
4a0de55c | 48 | static const struct nfs_rw_ops nfs_rw_write_ops; |
d4581383 | 49 | static void nfs_clear_request_commit(struct nfs_page *req); |
1da177e4 | 50 | |
e18b890b | 51 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 52 | static mempool_t *nfs_wdata_mempool; |
0b7c0153 | 53 | static struct kmem_cache *nfs_cdata_cachep; |
1da177e4 LT |
54 | static mempool_t *nfs_commit_mempool; |
55 | ||
0b7c0153 | 56 | struct nfs_commit_data *nfs_commitdata_alloc(void) |
1da177e4 | 57 | { |
192e501b | 58 | struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO); |
40859d7e | 59 | |
1da177e4 LT |
60 | if (p) { |
61 | memset(p, 0, sizeof(*p)); | |
62 | INIT_LIST_HEAD(&p->pages); | |
63 | } | |
64 | return p; | |
65 | } | |
e0c2b380 | 66 | EXPORT_SYMBOL_GPL(nfs_commitdata_alloc); |
1da177e4 | 67 | |
0b7c0153 | 68 | void nfs_commit_free(struct nfs_commit_data *p) |
1da177e4 LT |
69 | { |
70 | mempool_free(p, nfs_commit_mempool); | |
71 | } | |
e0c2b380 | 72 | EXPORT_SYMBOL_GPL(nfs_commit_free); |
1da177e4 | 73 | |
1e7f3a48 | 74 | static struct nfs_pgio_header *nfs_writehdr_alloc(void) |
3feb2d49 | 75 | { |
1e7f3a48 | 76 | struct nfs_pgio_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO); |
cd841605 | 77 | |
4a0de55c | 78 | if (p) |
3feb2d49 | 79 | memset(p, 0, sizeof(*p)); |
3feb2d49 TM |
80 | return p; |
81 | } | |
6c75dc0d | 82 | |
1e7f3a48 | 83 | static void nfs_writehdr_free(struct nfs_pgio_header *hdr) |
3feb2d49 | 84 | { |
1e7f3a48 | 85 | mempool_free(hdr, nfs_wdata_mempool); |
3feb2d49 | 86 | } |
1da177e4 | 87 | |
7b159fc1 TM |
88 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
89 | { | |
90 | ctx->error = error; | |
91 | smp_wmb(); | |
92 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
93 | } | |
94 | ||
84d3a9a9 WAA |
95 | /* |
96 | * nfs_page_find_head_request_locked - find head request associated with @page | |
97 | * | |
98 | * must be called while holding the inode lock. | |
99 | * | |
100 | * returns matching head request with reference held, or NULL if not found. | |
101 | */ | |
29418aa4 | 102 | static struct nfs_page * |
84d3a9a9 | 103 | nfs_page_find_head_request_locked(struct nfs_inode *nfsi, struct page *page) |
277459d2 TM |
104 | { |
105 | struct nfs_page *req = NULL; | |
106 | ||
29418aa4 | 107 | if (PagePrivate(page)) |
277459d2 | 108 | req = (struct nfs_page *)page_private(page); |
29418aa4 MG |
109 | else if (unlikely(PageSwapCache(page))) { |
110 | struct nfs_page *freq, *t; | |
111 | ||
112 | /* Linearly search the commit list for the correct req */ | |
113 | list_for_each_entry_safe(freq, t, &nfsi->commit_info.list, wb_list) { | |
114 | if (freq->wb_page == page) { | |
84d3a9a9 | 115 | req = freq->wb_head; |
29418aa4 MG |
116 | break; |
117 | } | |
118 | } | |
277459d2 | 119 | } |
29418aa4 | 120 | |
84d3a9a9 WAA |
121 | if (req) { |
122 | WARN_ON_ONCE(req->wb_head != req); | |
123 | ||
29418aa4 | 124 | kref_get(&req->wb_kref); |
84d3a9a9 | 125 | } |
29418aa4 | 126 | |
277459d2 TM |
127 | return req; |
128 | } | |
129 | ||
84d3a9a9 WAA |
130 | /* |
131 | * nfs_page_find_head_request - find head request associated with @page | |
132 | * | |
133 | * returns matching head request with reference held, or NULL if not found. | |
134 | */ | |
135 | static struct nfs_page *nfs_page_find_head_request(struct page *page) | |
277459d2 | 136 | { |
d56b4ddf | 137 | struct inode *inode = page_file_mapping(page)->host; |
277459d2 | 138 | struct nfs_page *req = NULL; |
277459d2 | 139 | |
587142f8 | 140 | spin_lock(&inode->i_lock); |
84d3a9a9 | 141 | req = nfs_page_find_head_request_locked(NFS_I(inode), page); |
587142f8 | 142 | spin_unlock(&inode->i_lock); |
277459d2 TM |
143 | return req; |
144 | } | |
145 | ||
1da177e4 LT |
146 | /* Adjust the file length if we're writing beyond the end */ |
147 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
148 | { | |
d56b4ddf | 149 | struct inode *inode = page_file_mapping(page)->host; |
a3d01454 TM |
150 | loff_t end, i_size; |
151 | pgoff_t end_index; | |
1da177e4 | 152 | |
a3d01454 TM |
153 | spin_lock(&inode->i_lock); |
154 | i_size = i_size_read(inode); | |
155 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
d56b4ddf | 156 | if (i_size > 0 && page_file_index(page) < end_index) |
a3d01454 | 157 | goto out; |
d56b4ddf | 158 | end = page_file_offset(page) + ((loff_t)offset+count); |
1da177e4 | 159 | if (i_size >= end) |
a3d01454 | 160 | goto out; |
1da177e4 | 161 | i_size_write(inode, end); |
a3d01454 TM |
162 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
163 | out: | |
164 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
165 | } |
166 | ||
a301b777 TM |
167 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
168 | static void nfs_set_pageerror(struct page *page) | |
169 | { | |
d56b4ddf | 170 | nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page)); |
a301b777 TM |
171 | } |
172 | ||
d72ddcba WAA |
173 | /* |
174 | * nfs_page_group_search_locked | |
175 | * @head - head request of page group | |
176 | * @page_offset - offset into page | |
177 | * | |
178 | * Search page group with head @head to find a request that contains the | |
179 | * page offset @page_offset. | |
180 | * | |
181 | * Returns a pointer to the first matching nfs request, or NULL if no | |
182 | * match is found. | |
183 | * | |
184 | * Must be called with the page group lock held | |
185 | */ | |
186 | static struct nfs_page * | |
187 | nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset) | |
188 | { | |
189 | struct nfs_page *req; | |
190 | ||
191 | WARN_ON_ONCE(head != head->wb_head); | |
192 | WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_head->wb_flags)); | |
193 | ||
194 | req = head; | |
195 | do { | |
196 | if (page_offset >= req->wb_pgbase && | |
197 | page_offset < (req->wb_pgbase + req->wb_bytes)) | |
198 | return req; | |
199 | ||
200 | req = req->wb_this_page; | |
201 | } while (req != head); | |
202 | ||
203 | return NULL; | |
204 | } | |
205 | ||
206 | /* | |
207 | * nfs_page_group_covers_page | |
208 | * @head - head request of page group | |
209 | * | |
210 | * Return true if the page group with head @head covers the whole page, | |
211 | * returns false otherwise | |
212 | */ | |
213 | static bool nfs_page_group_covers_page(struct nfs_page *req) | |
214 | { | |
215 | struct nfs_page *tmp; | |
216 | unsigned int pos = 0; | |
217 | unsigned int len = nfs_page_length(req->wb_page); | |
218 | ||
219 | nfs_page_group_lock(req); | |
220 | ||
221 | do { | |
222 | tmp = nfs_page_group_search_locked(req->wb_head, pos); | |
223 | if (tmp) { | |
224 | /* no way this should happen */ | |
225 | WARN_ON_ONCE(tmp->wb_pgbase != pos); | |
226 | pos += tmp->wb_bytes - (pos - tmp->wb_pgbase); | |
227 | } | |
228 | } while (tmp && pos < len); | |
229 | ||
230 | nfs_page_group_unlock(req); | |
231 | WARN_ON_ONCE(pos > len); | |
232 | return pos == len; | |
233 | } | |
234 | ||
1da177e4 LT |
235 | /* We can set the PG_uptodate flag if we see that a write request |
236 | * covers the full page. | |
237 | */ | |
d72ddcba | 238 | static void nfs_mark_uptodate(struct nfs_page *req) |
1da177e4 | 239 | { |
d72ddcba | 240 | if (PageUptodate(req->wb_page)) |
1da177e4 | 241 | return; |
d72ddcba | 242 | if (!nfs_page_group_covers_page(req)) |
1da177e4 | 243 | return; |
d72ddcba | 244 | SetPageUptodate(req->wb_page); |
1da177e4 LT |
245 | } |
246 | ||
1da177e4 LT |
247 | static int wb_priority(struct writeback_control *wbc) |
248 | { | |
249 | if (wbc->for_reclaim) | |
c63c7b05 | 250 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
b17621fe | 251 | if (wbc->for_kupdate || wbc->for_background) |
b31268ac TM |
252 | return FLUSH_LOWPRI | FLUSH_COND_STABLE; |
253 | return FLUSH_COND_STABLE; | |
1da177e4 LT |
254 | } |
255 | ||
89a09141 PZ |
256 | /* |
257 | * NFS congestion control | |
258 | */ | |
259 | ||
260 | int nfs_congestion_kb; | |
261 | ||
262 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
263 | #define NFS_CONGESTION_OFF_THRESH \ | |
264 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
265 | ||
deed85e7 | 266 | static void nfs_set_page_writeback(struct page *page) |
89a09141 | 267 | { |
deed85e7 | 268 | struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host); |
5a6d41b3 TM |
269 | int ret = test_set_page_writeback(page); |
270 | ||
deed85e7 | 271 | WARN_ON_ONCE(ret != 0); |
89a09141 | 272 | |
deed85e7 TM |
273 | if (atomic_long_inc_return(&nfss->writeback) > |
274 | NFS_CONGESTION_ON_THRESH) { | |
275 | set_bdi_congested(&nfss->backing_dev_info, | |
276 | BLK_RW_ASYNC); | |
89a09141 PZ |
277 | } |
278 | } | |
279 | ||
20633f04 | 280 | static void nfs_end_page_writeback(struct nfs_page *req) |
89a09141 | 281 | { |
20633f04 | 282 | struct inode *inode = page_file_mapping(req->wb_page)->host; |
89a09141 PZ |
283 | struct nfs_server *nfss = NFS_SERVER(inode); |
284 | ||
20633f04 WAA |
285 | if (!nfs_page_group_sync_on_bit(req, PG_WB_END)) |
286 | return; | |
287 | ||
288 | end_page_writeback(req->wb_page); | |
c4dc4bee | 289 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
8aa7e847 | 290 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
89a09141 PZ |
291 | } |
292 | ||
d4581383 WAA |
293 | |
294 | /* nfs_page_group_clear_bits | |
295 | * @req - an nfs request | |
296 | * clears all page group related bits from @req | |
297 | */ | |
298 | static void | |
299 | nfs_page_group_clear_bits(struct nfs_page *req) | |
300 | { | |
301 | clear_bit(PG_TEARDOWN, &req->wb_flags); | |
302 | clear_bit(PG_UNLOCKPAGE, &req->wb_flags); | |
303 | clear_bit(PG_UPTODATE, &req->wb_flags); | |
304 | clear_bit(PG_WB_END, &req->wb_flags); | |
305 | clear_bit(PG_REMOVE, &req->wb_flags); | |
306 | } | |
307 | ||
308 | ||
309 | /* | |
310 | * nfs_unroll_locks_and_wait - unlock all newly locked reqs and wait on @req | |
311 | * | |
312 | * this is a helper function for nfs_lock_and_join_requests | |
313 | * | |
314 | * @inode - inode associated with request page group, must be holding inode lock | |
315 | * @head - head request of page group, must be holding head lock | |
316 | * @req - request that couldn't lock and needs to wait on the req bit lock | |
317 | * @nonblock - if true, don't actually wait | |
318 | * | |
319 | * NOTE: this must be called holding page_group bit lock and inode spin lock | |
320 | * and BOTH will be released before returning. | |
321 | * | |
322 | * returns 0 on success, < 0 on error. | |
323 | */ | |
324 | static int | |
325 | nfs_unroll_locks_and_wait(struct inode *inode, struct nfs_page *head, | |
326 | struct nfs_page *req, bool nonblock) | |
327 | __releases(&inode->i_lock) | |
328 | { | |
329 | struct nfs_page *tmp; | |
330 | int ret; | |
331 | ||
332 | /* relinquish all the locks successfully grabbed this run */ | |
333 | for (tmp = head ; tmp != req; tmp = tmp->wb_this_page) | |
334 | nfs_unlock_request(tmp); | |
335 | ||
336 | WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags)); | |
337 | ||
338 | /* grab a ref on the request that will be waited on */ | |
339 | kref_get(&req->wb_kref); | |
340 | ||
341 | nfs_page_group_unlock(head); | |
342 | spin_unlock(&inode->i_lock); | |
343 | ||
344 | /* release ref from nfs_page_find_head_request_locked */ | |
345 | nfs_release_request(head); | |
346 | ||
347 | if (!nonblock) | |
348 | ret = nfs_wait_on_request(req); | |
349 | else | |
350 | ret = -EAGAIN; | |
351 | nfs_release_request(req); | |
352 | ||
353 | return ret; | |
354 | } | |
355 | ||
356 | /* | |
357 | * nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests | |
358 | * | |
359 | * @destroy_list - request list (using wb_this_page) terminated by @old_head | |
360 | * @old_head - the old head of the list | |
361 | * | |
362 | * All subrequests must be locked and removed from all lists, so at this point | |
363 | * they are only "active" in this function, and possibly in nfs_wait_on_request | |
364 | * with a reference held by some other context. | |
365 | */ | |
366 | static void | |
367 | nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list, | |
368 | struct nfs_page *old_head) | |
369 | { | |
370 | while (destroy_list) { | |
371 | struct nfs_page *subreq = destroy_list; | |
372 | ||
373 | destroy_list = (subreq->wb_this_page == old_head) ? | |
374 | NULL : subreq->wb_this_page; | |
375 | ||
376 | WARN_ON_ONCE(old_head != subreq->wb_head); | |
377 | ||
378 | /* make sure old group is not used */ | |
379 | subreq->wb_head = subreq; | |
380 | subreq->wb_this_page = subreq; | |
381 | ||
382 | nfs_clear_request_commit(subreq); | |
383 | ||
384 | /* subreq is now totally disconnected from page group or any | |
385 | * write / commit lists. last chance to wake any waiters */ | |
386 | nfs_unlock_request(subreq); | |
387 | ||
388 | if (!test_bit(PG_TEARDOWN, &subreq->wb_flags)) { | |
389 | /* release ref on old head request */ | |
390 | nfs_release_request(old_head); | |
391 | ||
392 | nfs_page_group_clear_bits(subreq); | |
393 | ||
394 | /* release the PG_INODE_REF reference */ | |
395 | if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags)) | |
396 | nfs_release_request(subreq); | |
397 | else | |
398 | WARN_ON_ONCE(1); | |
399 | } else { | |
400 | WARN_ON_ONCE(test_bit(PG_CLEAN, &subreq->wb_flags)); | |
401 | /* zombie requests have already released the last | |
402 | * reference and were waiting on the rest of the | |
403 | * group to complete. Since it's no longer part of a | |
404 | * group, simply free the request */ | |
405 | nfs_page_group_clear_bits(subreq); | |
406 | nfs_free_request(subreq); | |
407 | } | |
408 | } | |
409 | } | |
410 | ||
411 | /* | |
412 | * nfs_lock_and_join_requests - join all subreqs to the head req and return | |
413 | * a locked reference, cancelling any pending | |
414 | * operations for this page. | |
415 | * | |
416 | * @page - the page used to lookup the "page group" of nfs_page structures | |
417 | * @nonblock - if true, don't block waiting for request locks | |
418 | * | |
419 | * This function joins all sub requests to the head request by first | |
420 | * locking all requests in the group, cancelling any pending operations | |
421 | * and finally updating the head request to cover the whole range covered by | |
422 | * the (former) group. All subrequests are removed from any write or commit | |
423 | * lists, unlinked from the group and destroyed. | |
424 | * | |
425 | * Returns a locked, referenced pointer to the head request - which after | |
426 | * this call is guaranteed to be the only request associated with the page. | |
427 | * Returns NULL if no requests are found for @page, or a ERR_PTR if an | |
428 | * error was encountered. | |
429 | */ | |
430 | static struct nfs_page * | |
431 | nfs_lock_and_join_requests(struct page *page, bool nonblock) | |
e261f51f | 432 | { |
d56b4ddf | 433 | struct inode *inode = page_file_mapping(page)->host; |
d4581383 WAA |
434 | struct nfs_page *head, *subreq; |
435 | struct nfs_page *destroy_list = NULL; | |
436 | unsigned int total_bytes; | |
e261f51f TM |
437 | int ret; |
438 | ||
d4581383 WAA |
439 | try_again: |
440 | total_bytes = 0; | |
441 | ||
442 | WARN_ON_ONCE(destroy_list); | |
443 | ||
587142f8 | 444 | spin_lock(&inode->i_lock); |
d4581383 WAA |
445 | |
446 | /* | |
447 | * A reference is taken only on the head request which acts as a | |
448 | * reference to the whole page group - the group will not be destroyed | |
449 | * until the head reference is released. | |
450 | */ | |
451 | head = nfs_page_find_head_request_locked(NFS_I(inode), page); | |
452 | ||
453 | if (!head) { | |
587142f8 | 454 | spin_unlock(&inode->i_lock); |
d4581383 WAA |
455 | return NULL; |
456 | } | |
457 | ||
458 | /* lock each request in the page group */ | |
459 | nfs_page_group_lock(head); | |
460 | subreq = head; | |
461 | do { | |
462 | /* | |
463 | * Subrequests are always contiguous, non overlapping | |
464 | * and in order. If not, it's a programming error. | |
465 | */ | |
466 | WARN_ON_ONCE(subreq->wb_offset != | |
467 | (head->wb_offset + total_bytes)); | |
468 | ||
469 | /* keep track of how many bytes this group covers */ | |
470 | total_bytes += subreq->wb_bytes; | |
471 | ||
472 | if (!nfs_lock_request(subreq)) { | |
473 | /* releases page group bit lock and | |
474 | * inode spin lock and all references */ | |
475 | ret = nfs_unroll_locks_and_wait(inode, head, | |
476 | subreq, nonblock); | |
477 | ||
478 | if (ret == 0) | |
479 | goto try_again; | |
480 | ||
074cc1de | 481 | return ERR_PTR(ret); |
d4581383 WAA |
482 | } |
483 | ||
484 | subreq = subreq->wb_this_page; | |
485 | } while (subreq != head); | |
486 | ||
487 | /* Now that all requests are locked, make sure they aren't on any list. | |
488 | * Commit list removal accounting is done after locks are dropped */ | |
489 | subreq = head; | |
490 | do { | |
491 | nfs_list_remove_request(subreq); | |
492 | subreq = subreq->wb_this_page; | |
493 | } while (subreq != head); | |
494 | ||
495 | /* unlink subrequests from head, destroy them later */ | |
496 | if (head->wb_this_page != head) { | |
497 | /* destroy list will be terminated by head */ | |
498 | destroy_list = head->wb_this_page; | |
499 | head->wb_this_page = head; | |
500 | ||
501 | /* change head request to cover whole range that | |
502 | * the former page group covered */ | |
503 | head->wb_bytes = total_bytes; | |
e261f51f | 504 | } |
d4581383 WAA |
505 | |
506 | /* | |
507 | * prepare head request to be added to new pgio descriptor | |
508 | */ | |
509 | nfs_page_group_clear_bits(head); | |
510 | ||
511 | /* | |
512 | * some part of the group was still on the inode list - otherwise | |
513 | * the group wouldn't be involved in async write. | |
514 | * grab a reference for the head request, iff it needs one. | |
515 | */ | |
516 | if (!test_and_set_bit(PG_INODE_REF, &head->wb_flags)) | |
517 | kref_get(&head->wb_kref); | |
518 | ||
519 | nfs_page_group_unlock(head); | |
520 | ||
521 | /* drop lock to clear_request_commit the head req and clean up | |
522 | * requests on destroy list */ | |
587142f8 | 523 | spin_unlock(&inode->i_lock); |
d4581383 WAA |
524 | |
525 | nfs_destroy_unlinked_subrequests(destroy_list, head); | |
526 | ||
527 | /* clean up commit list state */ | |
528 | nfs_clear_request_commit(head); | |
529 | ||
530 | /* still holds ref on head from nfs_page_find_head_request_locked | |
531 | * and still has lock on head from lock loop */ | |
532 | return head; | |
074cc1de TM |
533 | } |
534 | ||
535 | /* | |
536 | * Find an associated nfs write request, and prepare to flush it out | |
537 | * May return an error if the user signalled nfs_wait_on_request(). | |
538 | */ | |
539 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, | |
cfb506e1 | 540 | struct page *page, bool nonblock) |
074cc1de TM |
541 | { |
542 | struct nfs_page *req; | |
543 | int ret = 0; | |
544 | ||
d4581383 | 545 | req = nfs_lock_and_join_requests(page, nonblock); |
074cc1de TM |
546 | if (!req) |
547 | goto out; | |
548 | ret = PTR_ERR(req); | |
549 | if (IS_ERR(req)) | |
550 | goto out; | |
551 | ||
deed85e7 TM |
552 | nfs_set_page_writeback(page); |
553 | WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags)); | |
074cc1de | 554 | |
deed85e7 | 555 | ret = 0; |
f8512ad0 FI |
556 | if (!nfs_pageio_add_request(pgio, req)) { |
557 | nfs_redirty_request(req); | |
074cc1de | 558 | ret = pgio->pg_error; |
f8512ad0 | 559 | } |
074cc1de TM |
560 | out: |
561 | return ret; | |
e261f51f TM |
562 | } |
563 | ||
f758c885 | 564 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 565 | { |
d56b4ddf | 566 | struct inode *inode = page_file_mapping(page)->host; |
cfb506e1 | 567 | int ret; |
1da177e4 | 568 | |
91d5b470 CL |
569 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
570 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
571 | ||
d56b4ddf | 572 | nfs_pageio_cond_complete(pgio, page_file_index(page)); |
1b430bee | 573 | ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE); |
cfb506e1 TM |
574 | if (ret == -EAGAIN) { |
575 | redirty_page_for_writepage(wbc, page); | |
576 | ret = 0; | |
577 | } | |
578 | return ret; | |
f758c885 | 579 | } |
7fe7f848 | 580 | |
f758c885 TM |
581 | /* |
582 | * Write an mmapped page to the server. | |
583 | */ | |
584 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
585 | { | |
586 | struct nfs_pageio_descriptor pgio; | |
587 | int err; | |
49a70f27 | 588 | |
a20c93e3 CH |
589 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc), |
590 | false, &nfs_async_write_completion_ops); | |
f758c885 TM |
591 | err = nfs_do_writepage(page, wbc, &pgio); |
592 | nfs_pageio_complete(&pgio); | |
593 | if (err < 0) | |
594 | return err; | |
595 | if (pgio.pg_error < 0) | |
596 | return pgio.pg_error; | |
597 | return 0; | |
4d770ccf TM |
598 | } |
599 | ||
600 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
601 | { | |
f758c885 | 602 | int ret; |
4d770ccf | 603 | |
f758c885 | 604 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 605 | unlock_page(page); |
f758c885 TM |
606 | return ret; |
607 | } | |
608 | ||
609 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
610 | { | |
611 | int ret; | |
612 | ||
613 | ret = nfs_do_writepage(page, wbc, data); | |
614 | unlock_page(page); | |
615 | return ret; | |
1da177e4 LT |
616 | } |
617 | ||
1da177e4 LT |
618 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
619 | { | |
1da177e4 | 620 | struct inode *inode = mapping->host; |
72cb77f4 | 621 | unsigned long *bitlock = &NFS_I(inode)->flags; |
c63c7b05 | 622 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
623 | int err; |
624 | ||
72cb77f4 TM |
625 | /* Stop dirtying of new pages while we sync */ |
626 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, | |
627 | nfs_wait_bit_killable, TASK_KILLABLE); | |
628 | if (err) | |
629 | goto out_err; | |
630 | ||
91d5b470 CL |
631 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
632 | ||
a20c93e3 CH |
633 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false, |
634 | &nfs_async_write_completion_ops); | |
f758c885 | 635 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 636 | nfs_pageio_complete(&pgio); |
72cb77f4 TM |
637 | |
638 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); | |
4e857c58 | 639 | smp_mb__after_atomic(); |
72cb77f4 TM |
640 | wake_up_bit(bitlock, NFS_INO_FLUSHING); |
641 | ||
f758c885 | 642 | if (err < 0) |
72cb77f4 TM |
643 | goto out_err; |
644 | err = pgio.pg_error; | |
645 | if (err < 0) | |
646 | goto out_err; | |
c63c7b05 | 647 | return 0; |
72cb77f4 TM |
648 | out_err: |
649 | return err; | |
1da177e4 LT |
650 | } |
651 | ||
652 | /* | |
653 | * Insert a write request into an inode | |
654 | */ | |
d6d6dc7c | 655 | static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
1da177e4 LT |
656 | { |
657 | struct nfs_inode *nfsi = NFS_I(inode); | |
e7d39069 | 658 | |
2bfc6e56 WAA |
659 | WARN_ON_ONCE(req->wb_this_page != req); |
660 | ||
e7d39069 | 661 | /* Lock the request! */ |
7ad84aa9 | 662 | nfs_lock_request(req); |
e7d39069 TM |
663 | |
664 | spin_lock(&inode->i_lock); | |
011e2a7f | 665 | if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) |
a9a4a87a | 666 | inode->i_version++; |
29418aa4 MG |
667 | /* |
668 | * Swap-space should not get truncated. Hence no need to plug the race | |
669 | * with invalidate/truncate. | |
670 | */ | |
671 | if (likely(!PageSwapCache(req->wb_page))) { | |
672 | set_bit(PG_MAPPED, &req->wb_flags); | |
673 | SetPagePrivate(req->wb_page); | |
674 | set_page_private(req->wb_page, (unsigned long)req); | |
675 | } | |
1da177e4 | 676 | nfsi->npages++; |
17089a29 WAA |
677 | /* this a head request for a page group - mark it as having an |
678 | * extra reference so sub groups can follow suit */ | |
679 | WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags)); | |
c03b4024 | 680 | kref_get(&req->wb_kref); |
e7d39069 | 681 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
682 | } |
683 | ||
684 | /* | |
89a09141 | 685 | * Remove a write request from an inode |
1da177e4 LT |
686 | */ |
687 | static void nfs_inode_remove_request(struct nfs_page *req) | |
688 | { | |
3d4ff43d | 689 | struct inode *inode = req->wb_context->dentry->d_inode; |
1da177e4 | 690 | struct nfs_inode *nfsi = NFS_I(inode); |
20633f04 | 691 | struct nfs_page *head; |
1da177e4 | 692 | |
20633f04 WAA |
693 | if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) { |
694 | head = req->wb_head; | |
695 | ||
696 | spin_lock(&inode->i_lock); | |
697 | if (likely(!PageSwapCache(head->wb_page))) { | |
698 | set_page_private(head->wb_page, 0); | |
699 | ClearPagePrivate(head->wb_page); | |
700 | clear_bit(PG_MAPPED, &head->wb_flags); | |
701 | } | |
702 | nfsi->npages--; | |
703 | spin_unlock(&inode->i_lock); | |
29418aa4 | 704 | } |
17089a29 WAA |
705 | |
706 | if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags)) | |
707 | nfs_release_request(req); | |
1da177e4 LT |
708 | } |
709 | ||
61822ab5 | 710 | static void |
6d884e8f | 711 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 712 | { |
61822ab5 TM |
713 | __set_page_dirty_nobuffers(req->wb_page); |
714 | } | |
715 | ||
89d77c8f | 716 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
8dd37758 TM |
717 | /** |
718 | * nfs_request_add_commit_list - add request to a commit list | |
719 | * @req: pointer to a struct nfs_page | |
ea2cf228 FI |
720 | * @dst: commit list head |
721 | * @cinfo: holds list lock and accounting info | |
8dd37758 | 722 | * |
ea2cf228 | 723 | * This sets the PG_CLEAN bit, updates the cinfo count of |
8dd37758 TM |
724 | * number of outstanding requests requiring a commit as well as |
725 | * the MM page stats. | |
726 | * | |
ea2cf228 | 727 | * The caller must _not_ hold the cinfo->lock, but must be |
8dd37758 | 728 | * holding the nfs_page lock. |
1da177e4 | 729 | */ |
8dd37758 | 730 | void |
ea2cf228 FI |
731 | nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst, |
732 | struct nfs_commit_info *cinfo) | |
1da177e4 | 733 | { |
e468bae9 | 734 | set_bit(PG_CLEAN, &(req)->wb_flags); |
ea2cf228 FI |
735 | spin_lock(cinfo->lock); |
736 | nfs_list_add_request(req, dst); | |
737 | cinfo->mds->ncommit++; | |
738 | spin_unlock(cinfo->lock); | |
56f9cd68 FI |
739 | if (!cinfo->dreq) { |
740 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); | |
d56b4ddf | 741 | inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, |
56f9cd68 FI |
742 | BDI_RECLAIMABLE); |
743 | __mark_inode_dirty(req->wb_context->dentry->d_inode, | |
744 | I_DIRTY_DATASYNC); | |
745 | } | |
1da177e4 | 746 | } |
8dd37758 TM |
747 | EXPORT_SYMBOL_GPL(nfs_request_add_commit_list); |
748 | ||
749 | /** | |
750 | * nfs_request_remove_commit_list - Remove request from a commit list | |
751 | * @req: pointer to a nfs_page | |
ea2cf228 | 752 | * @cinfo: holds list lock and accounting info |
8dd37758 | 753 | * |
ea2cf228 | 754 | * This clears the PG_CLEAN bit, and updates the cinfo's count of |
8dd37758 TM |
755 | * number of outstanding requests requiring a commit |
756 | * It does not update the MM page stats. | |
757 | * | |
ea2cf228 | 758 | * The caller _must_ hold the cinfo->lock and the nfs_page lock. |
8dd37758 TM |
759 | */ |
760 | void | |
ea2cf228 FI |
761 | nfs_request_remove_commit_list(struct nfs_page *req, |
762 | struct nfs_commit_info *cinfo) | |
8dd37758 | 763 | { |
8dd37758 TM |
764 | if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) |
765 | return; | |
766 | nfs_list_remove_request(req); | |
ea2cf228 | 767 | cinfo->mds->ncommit--; |
8dd37758 TM |
768 | } |
769 | EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list); | |
770 | ||
ea2cf228 FI |
771 | static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, |
772 | struct inode *inode) | |
773 | { | |
774 | cinfo->lock = &inode->i_lock; | |
775 | cinfo->mds = &NFS_I(inode)->commit_info; | |
776 | cinfo->ds = pnfs_get_ds_info(inode); | |
b359f9d0 | 777 | cinfo->dreq = NULL; |
f453a54a | 778 | cinfo->completion_ops = &nfs_commit_completion_ops; |
ea2cf228 FI |
779 | } |
780 | ||
781 | void nfs_init_cinfo(struct nfs_commit_info *cinfo, | |
782 | struct inode *inode, | |
783 | struct nfs_direct_req *dreq) | |
784 | { | |
1763da12 FI |
785 | if (dreq) |
786 | nfs_init_cinfo_from_dreq(cinfo, dreq); | |
787 | else | |
788 | nfs_init_cinfo_from_inode(cinfo, inode); | |
ea2cf228 FI |
789 | } |
790 | EXPORT_SYMBOL_GPL(nfs_init_cinfo); | |
8dd37758 TM |
791 | |
792 | /* | |
793 | * Add a request to the inode's commit list. | |
794 | */ | |
1763da12 | 795 | void |
ea2cf228 FI |
796 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, |
797 | struct nfs_commit_info *cinfo) | |
8dd37758 | 798 | { |
ea2cf228 | 799 | if (pnfs_mark_request_commit(req, lseg, cinfo)) |
8dd37758 | 800 | return; |
ea2cf228 | 801 | nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo); |
8dd37758 | 802 | } |
8e821cad | 803 | |
d6d6dc7c FI |
804 | static void |
805 | nfs_clear_page_commit(struct page *page) | |
806 | { | |
807 | dec_zone_page_state(page, NR_UNSTABLE_NFS); | |
d56b4ddf | 808 | dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE); |
d6d6dc7c FI |
809 | } |
810 | ||
8dd37758 | 811 | static void |
e468bae9 TM |
812 | nfs_clear_request_commit(struct nfs_page *req) |
813 | { | |
8dd37758 TM |
814 | if (test_bit(PG_CLEAN, &req->wb_flags)) { |
815 | struct inode *inode = req->wb_context->dentry->d_inode; | |
ea2cf228 | 816 | struct nfs_commit_info cinfo; |
e468bae9 | 817 | |
ea2cf228 FI |
818 | nfs_init_cinfo_from_inode(&cinfo, inode); |
819 | if (!pnfs_clear_request_commit(req, &cinfo)) { | |
820 | spin_lock(cinfo.lock); | |
821 | nfs_request_remove_commit_list(req, &cinfo); | |
822 | spin_unlock(cinfo.lock); | |
8dd37758 | 823 | } |
d6d6dc7c | 824 | nfs_clear_page_commit(req->wb_page); |
e468bae9 | 825 | } |
e468bae9 TM |
826 | } |
827 | ||
d45f60c6 | 828 | int nfs_write_need_commit(struct nfs_pgio_header *hdr) |
8e821cad | 829 | { |
c65e6254 | 830 | if (hdr->verf.committed == NFS_DATA_SYNC) |
d45f60c6 | 831 | return hdr->lseg == NULL; |
c65e6254 | 832 | return hdr->verf.committed != NFS_FILE_SYNC; |
8e821cad TM |
833 | } |
834 | ||
8e821cad | 835 | #else |
68cd6fa4 BS |
836 | static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo, |
837 | struct inode *inode) | |
838 | { | |
839 | } | |
840 | ||
841 | void nfs_init_cinfo(struct nfs_commit_info *cinfo, | |
842 | struct inode *inode, | |
843 | struct nfs_direct_req *dreq) | |
844 | { | |
845 | } | |
846 | ||
1763da12 | 847 | void |
ea2cf228 FI |
848 | nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg, |
849 | struct nfs_commit_info *cinfo) | |
8e821cad TM |
850 | { |
851 | } | |
852 | ||
8dd37758 | 853 | static void |
e468bae9 TM |
854 | nfs_clear_request_commit(struct nfs_page *req) |
855 | { | |
e468bae9 TM |
856 | } |
857 | ||
d45f60c6 | 858 | int nfs_write_need_commit(struct nfs_pgio_header *hdr) |
8e821cad TM |
859 | { |
860 | return 0; | |
861 | } | |
862 | ||
6c75dc0d FI |
863 | #endif |
864 | ||
061ae2ed | 865 | static void nfs_write_completion(struct nfs_pgio_header *hdr) |
8e821cad | 866 | { |
ea2cf228 | 867 | struct nfs_commit_info cinfo; |
6c75dc0d FI |
868 | unsigned long bytes = 0; |
869 | ||
870 | if (test_bit(NFS_IOHDR_REDO, &hdr->flags)) | |
871 | goto out; | |
ea2cf228 | 872 | nfs_init_cinfo_from_inode(&cinfo, hdr->inode); |
6c75dc0d FI |
873 | while (!list_empty(&hdr->pages)) { |
874 | struct nfs_page *req = nfs_list_entry(hdr->pages.next); | |
6c75dc0d FI |
875 | |
876 | bytes += req->wb_bytes; | |
877 | nfs_list_remove_request(req); | |
878 | if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) && | |
879 | (hdr->good_bytes < bytes)) { | |
d1182b33 | 880 | nfs_set_pageerror(req->wb_page); |
6c75dc0d FI |
881 | nfs_context_set_write_error(req->wb_context, hdr->error); |
882 | goto remove_req; | |
883 | } | |
c65e6254 | 884 | if (nfs_write_need_commit(hdr)) { |
f79d06f5 | 885 | memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); |
ea2cf228 | 886 | nfs_mark_request_commit(req, hdr->lseg, &cinfo); |
6c75dc0d FI |
887 | goto next; |
888 | } | |
889 | remove_req: | |
890 | nfs_inode_remove_request(req); | |
891 | next: | |
1d1afcbc | 892 | nfs_unlock_request(req); |
20633f04 | 893 | nfs_end_page_writeback(req); |
3aff4ebb | 894 | nfs_release_request(req); |
6c75dc0d FI |
895 | } |
896 | out: | |
897 | hdr->release(hdr); | |
8e821cad | 898 | } |
1da177e4 | 899 | |
89d77c8f | 900 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
ce59515c | 901 | unsigned long |
ea2cf228 | 902 | nfs_reqs_to_commit(struct nfs_commit_info *cinfo) |
fb8a1f11 | 903 | { |
ea2cf228 | 904 | return cinfo->mds->ncommit; |
d6d6dc7c FI |
905 | } |
906 | ||
ea2cf228 | 907 | /* cinfo->lock held by caller */ |
1763da12 | 908 | int |
ea2cf228 FI |
909 | nfs_scan_commit_list(struct list_head *src, struct list_head *dst, |
910 | struct nfs_commit_info *cinfo, int max) | |
d6d6dc7c FI |
911 | { |
912 | struct nfs_page *req, *tmp; | |
913 | int ret = 0; | |
914 | ||
915 | list_for_each_entry_safe(req, tmp, src, wb_list) { | |
8dd37758 TM |
916 | if (!nfs_lock_request(req)) |
917 | continue; | |
7ad84aa9 | 918 | kref_get(&req->wb_kref); |
ea2cf228 | 919 | if (cond_resched_lock(cinfo->lock)) |
3b3be88d | 920 | list_safe_reset_next(req, tmp, wb_list); |
ea2cf228 | 921 | nfs_request_remove_commit_list(req, cinfo); |
8dd37758 TM |
922 | nfs_list_add_request(req, dst); |
923 | ret++; | |
1763da12 | 924 | if ((ret == max) && !cinfo->dreq) |
8dd37758 | 925 | break; |
d6d6dc7c FI |
926 | } |
927 | return ret; | |
fb8a1f11 TM |
928 | } |
929 | ||
1da177e4 LT |
930 | /* |
931 | * nfs_scan_commit - Scan an inode for commit requests | |
932 | * @inode: NFS inode to scan | |
ea2cf228 FI |
933 | * @dst: mds destination list |
934 | * @cinfo: mds and ds lists of reqs ready to commit | |
1da177e4 LT |
935 | * |
936 | * Moves requests from the inode's 'commit' request list. | |
937 | * The requests are *not* checked to ensure that they form a contiguous set. | |
938 | */ | |
1763da12 | 939 | int |
ea2cf228 FI |
940 | nfs_scan_commit(struct inode *inode, struct list_head *dst, |
941 | struct nfs_commit_info *cinfo) | |
1da177e4 | 942 | { |
d6d6dc7c | 943 | int ret = 0; |
fb8a1f11 | 944 | |
ea2cf228 FI |
945 | spin_lock(cinfo->lock); |
946 | if (cinfo->mds->ncommit > 0) { | |
8dd37758 | 947 | const int max = INT_MAX; |
d6d6dc7c | 948 | |
ea2cf228 FI |
949 | ret = nfs_scan_commit_list(&cinfo->mds->list, dst, |
950 | cinfo, max); | |
951 | ret += pnfs_scan_commit_lists(inode, cinfo, max - ret); | |
d6d6dc7c | 952 | } |
ea2cf228 | 953 | spin_unlock(cinfo->lock); |
ff778d02 | 954 | return ret; |
1da177e4 | 955 | } |
d6d6dc7c | 956 | |
c42de9dd | 957 | #else |
ce59515c | 958 | unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo) |
fb8a1f11 TM |
959 | { |
960 | return 0; | |
961 | } | |
962 | ||
1763da12 FI |
963 | int nfs_scan_commit(struct inode *inode, struct list_head *dst, |
964 | struct nfs_commit_info *cinfo) | |
c42de9dd TM |
965 | { |
966 | return 0; | |
967 | } | |
1da177e4 LT |
968 | #endif |
969 | ||
1da177e4 | 970 | /* |
e7d39069 TM |
971 | * Search for an existing write request, and attempt to update |
972 | * it to reflect a new dirty region on a given page. | |
1da177e4 | 973 | * |
e7d39069 TM |
974 | * If the attempt fails, then the existing request is flushed out |
975 | * to disk. | |
1da177e4 | 976 | */ |
e7d39069 TM |
977 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
978 | struct page *page, | |
979 | unsigned int offset, | |
980 | unsigned int bytes) | |
1da177e4 | 981 | { |
e7d39069 TM |
982 | struct nfs_page *req; |
983 | unsigned int rqend; | |
984 | unsigned int end; | |
985 | int error; | |
986 | ||
987 | if (!PagePrivate(page)) | |
988 | return NULL; | |
1da177e4 LT |
989 | |
990 | end = offset + bytes; | |
e7d39069 | 991 | spin_lock(&inode->i_lock); |
1da177e4 | 992 | |
1da177e4 | 993 | for (;;) { |
84d3a9a9 | 994 | req = nfs_page_find_head_request_locked(NFS_I(inode), page); |
e7d39069 TM |
995 | if (req == NULL) |
996 | goto out_unlock; | |
997 | ||
2bfc6e56 WAA |
998 | /* should be handled by nfs_flush_incompatible */ |
999 | WARN_ON_ONCE(req->wb_head != req); | |
1000 | WARN_ON_ONCE(req->wb_this_page != req); | |
1001 | ||
e7d39069 TM |
1002 | rqend = req->wb_offset + req->wb_bytes; |
1003 | /* | |
1004 | * Tell the caller to flush out the request if | |
1005 | * the offsets are non-contiguous. | |
1006 | * Note: nfs_flush_incompatible() will already | |
1007 | * have flushed out requests having wrong owners. | |
1008 | */ | |
e468bae9 | 1009 | if (offset > rqend |
e7d39069 TM |
1010 | || end < req->wb_offset) |
1011 | goto out_flushme; | |
1012 | ||
7ad84aa9 | 1013 | if (nfs_lock_request(req)) |
1da177e4 | 1014 | break; |
1da177e4 | 1015 | |
e7d39069 | 1016 | /* The request is locked, so wait and then retry */ |
587142f8 | 1017 | spin_unlock(&inode->i_lock); |
e7d39069 TM |
1018 | error = nfs_wait_on_request(req); |
1019 | nfs_release_request(req); | |
1020 | if (error != 0) | |
1021 | goto out_err; | |
1022 | spin_lock(&inode->i_lock); | |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | /* Okay, the request matches. Update the region */ | |
1026 | if (offset < req->wb_offset) { | |
1027 | req->wb_offset = offset; | |
1028 | req->wb_pgbase = offset; | |
1da177e4 | 1029 | } |
1da177e4 LT |
1030 | if (end > rqend) |
1031 | req->wb_bytes = end - req->wb_offset; | |
e7d39069 TM |
1032 | else |
1033 | req->wb_bytes = rqend - req->wb_offset; | |
1034 | out_unlock: | |
1035 | spin_unlock(&inode->i_lock); | |
ca138f36 FI |
1036 | if (req) |
1037 | nfs_clear_request_commit(req); | |
e7d39069 TM |
1038 | return req; |
1039 | out_flushme: | |
1040 | spin_unlock(&inode->i_lock); | |
1041 | nfs_release_request(req); | |
1042 | error = nfs_wb_page(inode, page); | |
1043 | out_err: | |
1044 | return ERR_PTR(error); | |
1045 | } | |
1046 | ||
1047 | /* | |
1048 | * Try to update an existing write request, or create one if there is none. | |
1049 | * | |
1050 | * Note: Should always be called with the Page Lock held to prevent races | |
1051 | * if we have to add a new request. Also assumes that the caller has | |
1052 | * already called nfs_flush_incompatible() if necessary. | |
1053 | */ | |
1054 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, | |
1055 | struct page *page, unsigned int offset, unsigned int bytes) | |
1056 | { | |
d56b4ddf | 1057 | struct inode *inode = page_file_mapping(page)->host; |
e7d39069 | 1058 | struct nfs_page *req; |
1da177e4 | 1059 | |
e7d39069 TM |
1060 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
1061 | if (req != NULL) | |
1062 | goto out; | |
2bfc6e56 | 1063 | req = nfs_create_request(ctx, page, NULL, offset, bytes); |
e7d39069 TM |
1064 | if (IS_ERR(req)) |
1065 | goto out; | |
d6d6dc7c | 1066 | nfs_inode_add_request(inode, req); |
efc91ed0 | 1067 | out: |
61e930a9 | 1068 | return req; |
1da177e4 LT |
1069 | } |
1070 | ||
e7d39069 TM |
1071 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
1072 | unsigned int offset, unsigned int count) | |
1073 | { | |
1074 | struct nfs_page *req; | |
1075 | ||
1076 | req = nfs_setup_write_request(ctx, page, offset, count); | |
1077 | if (IS_ERR(req)) | |
1078 | return PTR_ERR(req); | |
1079 | /* Update file length */ | |
1080 | nfs_grow_file(page, offset, count); | |
d72ddcba | 1081 | nfs_mark_uptodate(req); |
a6305ddb | 1082 | nfs_mark_request_dirty(req); |
1d1afcbc | 1083 | nfs_unlock_and_release_request(req); |
e7d39069 TM |
1084 | return 0; |
1085 | } | |
1086 | ||
1da177e4 LT |
1087 | int nfs_flush_incompatible(struct file *file, struct page *page) |
1088 | { | |
cd3758e3 | 1089 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
2a369153 | 1090 | struct nfs_lock_context *l_ctx; |
1da177e4 | 1091 | struct nfs_page *req; |
1a54533e | 1092 | int do_flush, status; |
1da177e4 LT |
1093 | /* |
1094 | * Look for a request corresponding to this page. If there | |
1095 | * is one, and it belongs to another file, we flush it out | |
1096 | * before we try to copy anything into the page. Do this | |
1097 | * due to the lack of an ACCESS-type call in NFSv2. | |
1098 | * Also do the same if we find a request from an existing | |
1099 | * dropped page. | |
1100 | */ | |
1a54533e | 1101 | do { |
84d3a9a9 | 1102 | req = nfs_page_find_head_request(page); |
1a54533e TM |
1103 | if (req == NULL) |
1104 | return 0; | |
2a369153 TM |
1105 | l_ctx = req->wb_lock_context; |
1106 | do_flush = req->wb_page != page || req->wb_context != ctx; | |
2bfc6e56 WAA |
1107 | /* for now, flush if more than 1 request in page_group */ |
1108 | do_flush |= req->wb_this_page != req; | |
0f1d2605 | 1109 | if (l_ctx && ctx->dentry->d_inode->i_flock != NULL) { |
2a369153 TM |
1110 | do_flush |= l_ctx->lockowner.l_owner != current->files |
1111 | || l_ctx->lockowner.l_pid != current->tgid; | |
1112 | } | |
1da177e4 | 1113 | nfs_release_request(req); |
1a54533e TM |
1114 | if (!do_flush) |
1115 | return 0; | |
d56b4ddf | 1116 | status = nfs_wb_page(page_file_mapping(page)->host, page); |
1a54533e TM |
1117 | } while (status == 0); |
1118 | return status; | |
1da177e4 LT |
1119 | } |
1120 | ||
dc24826b AA |
1121 | /* |
1122 | * Avoid buffered writes when a open context credential's key would | |
1123 | * expire soon. | |
1124 | * | |
1125 | * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL. | |
1126 | * | |
1127 | * Return 0 and set a credential flag which triggers the inode to flush | |
1128 | * and performs NFS_FILE_SYNC writes if the key will expired within | |
1129 | * RPC_KEY_EXPIRE_TIMEO. | |
1130 | */ | |
1131 | int | |
1132 | nfs_key_timeout_notify(struct file *filp, struct inode *inode) | |
1133 | { | |
1134 | struct nfs_open_context *ctx = nfs_file_open_context(filp); | |
1135 | struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth; | |
1136 | ||
1137 | return rpcauth_key_timeout_notify(auth, ctx->cred); | |
1138 | } | |
1139 | ||
1140 | /* | |
1141 | * Test if the open context credential key is marked to expire soon. | |
1142 | */ | |
1143 | bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx) | |
1144 | { | |
1145 | return rpcauth_cred_key_to_expire(ctx->cred); | |
1146 | } | |
1147 | ||
5d47a356 TM |
1148 | /* |
1149 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
1150 | * the PageUptodate() flag. In this case, we will need to turn off | |
1151 | * write optimisations that depend on the page contents being correct. | |
1152 | */ | |
8d197a56 | 1153 | static bool nfs_write_pageuptodate(struct page *page, struct inode *inode) |
5d47a356 | 1154 | { |
d529ef83 JL |
1155 | struct nfs_inode *nfsi = NFS_I(inode); |
1156 | ||
8d197a56 TM |
1157 | if (nfs_have_delegated_attributes(inode)) |
1158 | goto out; | |
18dd78c4 | 1159 | if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
d529ef83 | 1160 | return false; |
4db72b40 | 1161 | smp_rmb(); |
d529ef83 | 1162 | if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags)) |
8d197a56 TM |
1163 | return false; |
1164 | out: | |
18dd78c4 SM |
1165 | if (nfsi->cache_validity & NFS_INO_INVALID_DATA) |
1166 | return false; | |
8d197a56 | 1167 | return PageUptodate(page) != 0; |
5d47a356 TM |
1168 | } |
1169 | ||
c7559663 SM |
1170 | /* If we know the page is up to date, and we're not using byte range locks (or |
1171 | * if we have the whole file locked for writing), it may be more efficient to | |
1172 | * extend the write to cover the entire page in order to avoid fragmentation | |
1173 | * inefficiencies. | |
1174 | * | |
263b4509 SM |
1175 | * If the file is opened for synchronous writes then we can just skip the rest |
1176 | * of the checks. | |
c7559663 SM |
1177 | */ |
1178 | static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode) | |
1179 | { | |
1180 | if (file->f_flags & O_DSYNC) | |
1181 | return 0; | |
263b4509 SM |
1182 | if (!nfs_write_pageuptodate(page, inode)) |
1183 | return 0; | |
c7559663 SM |
1184 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) |
1185 | return 1; | |
263b4509 | 1186 | if (inode->i_flock == NULL || (inode->i_flock->fl_start == 0 && |
c7559663 | 1187 | inode->i_flock->fl_end == OFFSET_MAX && |
263b4509 | 1188 | inode->i_flock->fl_type != F_RDLCK)) |
c7559663 SM |
1189 | return 1; |
1190 | return 0; | |
1191 | } | |
1192 | ||
1da177e4 LT |
1193 | /* |
1194 | * Update and possibly write a cached page of an NFS file. | |
1195 | * | |
1196 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
1197 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
1198 | */ | |
1199 | int nfs_updatepage(struct file *file, struct page *page, | |
1200 | unsigned int offset, unsigned int count) | |
1201 | { | |
cd3758e3 | 1202 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
d56b4ddf | 1203 | struct inode *inode = page_file_mapping(page)->host; |
1da177e4 LT |
1204 | int status = 0; |
1205 | ||
91d5b470 CL |
1206 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
1207 | ||
6de1472f AV |
1208 | dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n", |
1209 | file, count, (long long)(page_file_offset(page) + offset)); | |
1da177e4 | 1210 | |
c7559663 | 1211 | if (nfs_can_extend_write(file, page, inode)) { |
49a70f27 | 1212 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 1213 | offset = 0; |
1da177e4 LT |
1214 | } |
1215 | ||
e21195a7 | 1216 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
1217 | if (status < 0) |
1218 | nfs_set_pageerror(page); | |
59b7c05f TM |
1219 | else |
1220 | __set_page_dirty_nobuffers(page); | |
1da177e4 | 1221 | |
48186c7d | 1222 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
1da177e4 | 1223 | status, (long long)i_size_read(inode)); |
1da177e4 LT |
1224 | return status; |
1225 | } | |
1226 | ||
3ff7576d | 1227 | static int flush_task_priority(int how) |
1da177e4 LT |
1228 | { |
1229 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
1230 | case FLUSH_HIGHPRI: | |
1231 | return RPC_PRIORITY_HIGH; | |
1232 | case FLUSH_LOWPRI: | |
1233 | return RPC_PRIORITY_LOW; | |
1234 | } | |
1235 | return RPC_PRIORITY_NORMAL; | |
1236 | } | |
1237 | ||
d45f60c6 WAA |
1238 | static void nfs_initiate_write(struct nfs_pgio_header *hdr, |
1239 | struct rpc_message *msg, | |
1ed26f33 | 1240 | struct rpc_task_setup *task_setup_data, int how) |
1da177e4 | 1241 | { |
d45f60c6 | 1242 | struct inode *inode = hdr->inode; |
3ff7576d | 1243 | int priority = flush_task_priority(how); |
d138d5d1 | 1244 | |
1ed26f33 | 1245 | task_setup_data->priority = priority; |
d45f60c6 | 1246 | NFS_PROTO(inode)->write_setup(hdr, msg); |
d138d5d1 | 1247 | |
8c21c62c | 1248 | nfs4_state_protect_write(NFS_SERVER(inode)->nfs_client, |
d45f60c6 | 1249 | &task_setup_data->rpc_client, msg, hdr); |
275acaaf TM |
1250 | } |
1251 | ||
6d884e8f F |
1252 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
1253 | * call this on each, which will prepare them to be retried on next | |
1254 | * writeback using standard nfs. | |
1255 | */ | |
1256 | static void nfs_redirty_request(struct nfs_page *req) | |
1257 | { | |
1258 | nfs_mark_request_dirty(req); | |
1d1afcbc | 1259 | nfs_unlock_request(req); |
20633f04 | 1260 | nfs_end_page_writeback(req); |
3aff4ebb | 1261 | nfs_release_request(req); |
6d884e8f F |
1262 | } |
1263 | ||
061ae2ed | 1264 | static void nfs_async_write_error(struct list_head *head) |
6c75dc0d FI |
1265 | { |
1266 | struct nfs_page *req; | |
1267 | ||
1268 | while (!list_empty(head)) { | |
1269 | req = nfs_list_entry(head->next); | |
1270 | nfs_list_remove_request(req); | |
1271 | nfs_redirty_request(req); | |
1272 | } | |
1273 | } | |
1274 | ||
061ae2ed FI |
1275 | static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = { |
1276 | .error_cleanup = nfs_async_write_error, | |
1277 | .completion = nfs_write_completion, | |
1278 | }; | |
1279 | ||
57208fa7 | 1280 | void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
a20c93e3 | 1281 | struct inode *inode, int ioflags, bool force_mds, |
061ae2ed | 1282 | const struct nfs_pgio_completion_ops *compl_ops) |
1da177e4 | 1283 | { |
a20c93e3 | 1284 | struct nfs_server *server = NFS_SERVER(inode); |
41d8d5b7 | 1285 | const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops; |
a20c93e3 CH |
1286 | |
1287 | #ifdef CONFIG_NFS_V4_1 | |
1288 | if (server->pnfs_curr_ld && !force_mds) | |
1289 | pg_ops = server->pnfs_curr_ld->pg_write_ops; | |
1290 | #endif | |
4a0de55c AS |
1291 | nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops, |
1292 | server->wsize, ioflags); | |
1751c363 | 1293 | } |
ddda8e0a | 1294 | EXPORT_SYMBOL_GPL(nfs_pageio_init_write); |
1da177e4 | 1295 | |
dce81290 TM |
1296 | void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio) |
1297 | { | |
41d8d5b7 | 1298 | pgio->pg_ops = &nfs_pgio_rw_ops; |
dce81290 TM |
1299 | pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize; |
1300 | } | |
1f945357 | 1301 | EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds); |
dce81290 | 1302 | |
1da177e4 | 1303 | |
0b7c0153 FI |
1304 | void nfs_commit_prepare(struct rpc_task *task, void *calldata) |
1305 | { | |
1306 | struct nfs_commit_data *data = calldata; | |
1307 | ||
1308 | NFS_PROTO(data->inode)->commit_rpc_prepare(task, data); | |
1309 | } | |
1310 | ||
d45f60c6 | 1311 | static void nfs_writeback_release_common(struct nfs_pgio_header *hdr) |
c9d8f89d | 1312 | { |
c65e6254 | 1313 | /* do nothing! */ |
1da177e4 LT |
1314 | } |
1315 | ||
1f2edbe3 TM |
1316 | /* |
1317 | * Special version of should_remove_suid() that ignores capabilities. | |
1318 | */ | |
1319 | static int nfs_should_remove_suid(const struct inode *inode) | |
1320 | { | |
1321 | umode_t mode = inode->i_mode; | |
1322 | int kill = 0; | |
1323 | ||
1324 | /* suid always must be killed */ | |
1325 | if (unlikely(mode & S_ISUID)) | |
1326 | kill = ATTR_KILL_SUID; | |
788e7a89 | 1327 | |
1f2edbe3 TM |
1328 | /* |
1329 | * sgid without any exec bits is just a mandatory locking mark; leave | |
1330 | * it alone. If some exec bits are set, it's a real sgid; kill it. | |
1331 | */ | |
1332 | if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) | |
1333 | kill |= ATTR_KILL_SGID; | |
1334 | ||
1335 | if (unlikely(kill && S_ISREG(mode))) | |
1336 | return kill; | |
1337 | ||
1338 | return 0; | |
1339 | } | |
788e7a89 | 1340 | |
1da177e4 LT |
1341 | /* |
1342 | * This function is called when the WRITE call is complete. | |
1343 | */ | |
d45f60c6 WAA |
1344 | static int nfs_writeback_done(struct rpc_task *task, |
1345 | struct nfs_pgio_header *hdr, | |
0eecb214 | 1346 | struct inode *inode) |
1da177e4 | 1347 | { |
788e7a89 | 1348 | int status; |
1da177e4 | 1349 | |
f551e44f CL |
1350 | /* |
1351 | * ->write_done will attempt to use post-op attributes to detect | |
1352 | * conflicting writes by other clients. A strict interpretation | |
1353 | * of close-to-open would allow us to continue caching even if | |
1354 | * another writer had changed the file, but some applications | |
1355 | * depend on tighter cache coherency when writing. | |
1356 | */ | |
d45f60c6 | 1357 | status = NFS_PROTO(inode)->write_done(task, hdr); |
788e7a89 | 1358 | if (status != 0) |
0eecb214 | 1359 | return status; |
d45f60c6 | 1360 | nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count); |
91d5b470 | 1361 | |
89d77c8f | 1362 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
d45f60c6 WAA |
1363 | if (hdr->res.verf->committed < hdr->args.stable && |
1364 | task->tk_status >= 0) { | |
1da177e4 LT |
1365 | /* We tried a write call, but the server did not |
1366 | * commit data to stable storage even though we | |
1367 | * requested it. | |
1368 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1369 | * the server reports NFS_DATA_SYNC, but performs | |
1370 | * NFS_FILE_SYNC. We therefore implement this checking | |
1371 | * as a dprintk() in order to avoid filling syslog. | |
1372 | */ | |
1373 | static unsigned long complain; | |
1374 | ||
a69aef14 | 1375 | /* Note this will print the MDS for a DS write */ |
1da177e4 | 1376 | if (time_before(complain, jiffies)) { |
48186c7d | 1377 | dprintk("NFS: faulty NFS server %s:" |
1da177e4 | 1378 | " (committed = %d) != (stable = %d)\n", |
cd841605 | 1379 | NFS_SERVER(inode)->nfs_client->cl_hostname, |
d45f60c6 | 1380 | hdr->res.verf->committed, hdr->args.stable); |
1da177e4 LT |
1381 | complain = jiffies + 300 * HZ; |
1382 | } | |
1383 | } | |
1384 | #endif | |
1f2edbe3 TM |
1385 | |
1386 | /* Deal with the suid/sgid bit corner case */ | |
1387 | if (nfs_should_remove_suid(inode)) | |
1388 | nfs_mark_for_revalidate(inode); | |
0eecb214 AS |
1389 | return 0; |
1390 | } | |
1391 | ||
1392 | /* | |
1393 | * This function is called when the WRITE call is complete. | |
1394 | */ | |
d45f60c6 WAA |
1395 | static void nfs_writeback_result(struct rpc_task *task, |
1396 | struct nfs_pgio_header *hdr) | |
0eecb214 | 1397 | { |
d45f60c6 WAA |
1398 | struct nfs_pgio_args *argp = &hdr->args; |
1399 | struct nfs_pgio_res *resp = &hdr->res; | |
1f2edbe3 TM |
1400 | |
1401 | if (resp->count < argp->count) { | |
1da177e4 LT |
1402 | static unsigned long complain; |
1403 | ||
6c75dc0d | 1404 | /* This a short write! */ |
d45f60c6 | 1405 | nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE); |
91d5b470 | 1406 | |
1da177e4 | 1407 | /* Has the server at least made some progress? */ |
6c75dc0d FI |
1408 | if (resp->count == 0) { |
1409 | if (time_before(complain, jiffies)) { | |
1410 | printk(KERN_WARNING | |
1411 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1412 | argp->count); | |
1413 | complain = jiffies + 300 * HZ; | |
1da177e4 | 1414 | } |
d45f60c6 | 1415 | nfs_set_pgio_error(hdr, -EIO, argp->offset); |
6c75dc0d | 1416 | task->tk_status = -EIO; |
13602896 | 1417 | return; |
1da177e4 | 1418 | } |
6c75dc0d FI |
1419 | /* Was this an NFSv2 write or an NFSv3 stable write? */ |
1420 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1421 | /* Resend from where the server left off */ | |
d45f60c6 | 1422 | hdr->mds_offset += resp->count; |
6c75dc0d FI |
1423 | argp->offset += resp->count; |
1424 | argp->pgbase += resp->count; | |
1425 | argp->count -= resp->count; | |
1426 | } else { | |
1427 | /* Resend as a stable write in order to avoid | |
1428 | * headaches in the case of a server crash. | |
1429 | */ | |
1430 | argp->stable = NFS_FILE_SYNC; | |
1da177e4 | 1431 | } |
6c75dc0d | 1432 | rpc_restart_call_prepare(task); |
1da177e4 | 1433 | } |
1da177e4 LT |
1434 | } |
1435 | ||
1436 | ||
89d77c8f | 1437 | #if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4) |
71d0a611 TM |
1438 | static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait) |
1439 | { | |
b8413f98 TM |
1440 | int ret; |
1441 | ||
71d0a611 TM |
1442 | if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags)) |
1443 | return 1; | |
b8413f98 TM |
1444 | if (!may_wait) |
1445 | return 0; | |
1446 | ret = out_of_line_wait_on_bit_lock(&nfsi->flags, | |
1447 | NFS_INO_COMMIT, | |
1448 | nfs_wait_bit_killable, | |
1449 | TASK_KILLABLE); | |
1450 | return (ret < 0) ? ret : 1; | |
71d0a611 TM |
1451 | } |
1452 | ||
f453a54a | 1453 | static void nfs_commit_clear_lock(struct nfs_inode *nfsi) |
71d0a611 TM |
1454 | { |
1455 | clear_bit(NFS_INO_COMMIT, &nfsi->flags); | |
4e857c58 | 1456 | smp_mb__after_atomic(); |
71d0a611 TM |
1457 | wake_up_bit(&nfsi->flags, NFS_INO_COMMIT); |
1458 | } | |
1459 | ||
0b7c0153 | 1460 | void nfs_commitdata_release(struct nfs_commit_data *data) |
1da177e4 | 1461 | { |
0b7c0153 FI |
1462 | put_nfs_open_context(data->context); |
1463 | nfs_commit_free(data); | |
1da177e4 | 1464 | } |
e0c2b380 | 1465 | EXPORT_SYMBOL_GPL(nfs_commitdata_release); |
1da177e4 | 1466 | |
0b7c0153 | 1467 | int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data, |
9ace33cd | 1468 | const struct rpc_call_ops *call_ops, |
9f0ec176 | 1469 | int how, int flags) |
1da177e4 | 1470 | { |
07737691 | 1471 | struct rpc_task *task; |
9ace33cd | 1472 | int priority = flush_task_priority(how); |
bdc7f021 TM |
1473 | struct rpc_message msg = { |
1474 | .rpc_argp = &data->args, | |
1475 | .rpc_resp = &data->res, | |
9ace33cd | 1476 | .rpc_cred = data->cred, |
bdc7f021 | 1477 | }; |
84115e1c | 1478 | struct rpc_task_setup task_setup_data = { |
07737691 | 1479 | .task = &data->task, |
9ace33cd | 1480 | .rpc_client = clnt, |
bdc7f021 | 1481 | .rpc_message = &msg, |
9ace33cd | 1482 | .callback_ops = call_ops, |
84115e1c | 1483 | .callback_data = data, |
101070ca | 1484 | .workqueue = nfsiod_workqueue, |
9f0ec176 | 1485 | .flags = RPC_TASK_ASYNC | flags, |
3ff7576d | 1486 | .priority = priority, |
84115e1c | 1487 | }; |
9ace33cd FI |
1488 | /* Set up the initial task struct. */ |
1489 | NFS_PROTO(data->inode)->commit_setup(data, &msg); | |
1490 | ||
1491 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); | |
1492 | ||
8c21c62c WAA |
1493 | nfs4_state_protect(NFS_SERVER(data->inode)->nfs_client, |
1494 | NFS_SP4_MACH_CRED_COMMIT, &task_setup_data.rpc_client, &msg); | |
1495 | ||
9ace33cd FI |
1496 | task = rpc_run_task(&task_setup_data); |
1497 | if (IS_ERR(task)) | |
1498 | return PTR_ERR(task); | |
1499 | if (how & FLUSH_SYNC) | |
1500 | rpc_wait_for_completion_task(task); | |
1501 | rpc_put_task(task); | |
1502 | return 0; | |
1503 | } | |
e0c2b380 | 1504 | EXPORT_SYMBOL_GPL(nfs_initiate_commit); |
9ace33cd FI |
1505 | |
1506 | /* | |
1507 | * Set up the argument/result storage required for the RPC call. | |
1508 | */ | |
0b7c0153 | 1509 | void nfs_init_commit(struct nfs_commit_data *data, |
f453a54a FI |
1510 | struct list_head *head, |
1511 | struct pnfs_layout_segment *lseg, | |
1512 | struct nfs_commit_info *cinfo) | |
9ace33cd FI |
1513 | { |
1514 | struct nfs_page *first = nfs_list_entry(head->next); | |
3d4ff43d | 1515 | struct inode *inode = first->wb_context->dentry->d_inode; |
1da177e4 LT |
1516 | |
1517 | /* Set up the RPC argument and reply structs | |
1518 | * NB: take care not to mess about with data->commit et al. */ | |
1519 | ||
1520 | list_splice_init(head, &data->pages); | |
1da177e4 | 1521 | |
1da177e4 | 1522 | data->inode = inode; |
9ace33cd | 1523 | data->cred = first->wb_context->cred; |
988b6dce | 1524 | data->lseg = lseg; /* reference transferred */ |
9ace33cd | 1525 | data->mds_ops = &nfs_commit_ops; |
f453a54a | 1526 | data->completion_ops = cinfo->completion_ops; |
b359f9d0 | 1527 | data->dreq = cinfo->dreq; |
1da177e4 LT |
1528 | |
1529 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1530 | /* Note: we always request a commit of the entire inode */ |
1531 | data->args.offset = 0; | |
1532 | data->args.count = 0; | |
0b7c0153 | 1533 | data->context = get_nfs_open_context(first->wb_context); |
1da177e4 LT |
1534 | data->res.fattr = &data->fattr; |
1535 | data->res.verf = &data->verf; | |
0e574af1 | 1536 | nfs_fattr_init(&data->fattr); |
1da177e4 | 1537 | } |
e0c2b380 | 1538 | EXPORT_SYMBOL_GPL(nfs_init_commit); |
1da177e4 | 1539 | |
e0c2b380 | 1540 | void nfs_retry_commit(struct list_head *page_list, |
ea2cf228 FI |
1541 | struct pnfs_layout_segment *lseg, |
1542 | struct nfs_commit_info *cinfo) | |
64bfeb49 FI |
1543 | { |
1544 | struct nfs_page *req; | |
1545 | ||
1546 | while (!list_empty(page_list)) { | |
1547 | req = nfs_list_entry(page_list->next); | |
1548 | nfs_list_remove_request(req); | |
ea2cf228 | 1549 | nfs_mark_request_commit(req, lseg, cinfo); |
56f9cd68 FI |
1550 | if (!cinfo->dreq) { |
1551 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); | |
d56b4ddf | 1552 | dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info, |
56f9cd68 FI |
1553 | BDI_RECLAIMABLE); |
1554 | } | |
1d1afcbc | 1555 | nfs_unlock_and_release_request(req); |
64bfeb49 FI |
1556 | } |
1557 | } | |
e0c2b380 | 1558 | EXPORT_SYMBOL_GPL(nfs_retry_commit); |
64bfeb49 | 1559 | |
1da177e4 LT |
1560 | /* |
1561 | * Commit dirty pages | |
1562 | */ | |
1563 | static int | |
ea2cf228 FI |
1564 | nfs_commit_list(struct inode *inode, struct list_head *head, int how, |
1565 | struct nfs_commit_info *cinfo) | |
1da177e4 | 1566 | { |
0b7c0153 | 1567 | struct nfs_commit_data *data; |
1da177e4 | 1568 | |
c9d8f89d | 1569 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1570 | |
1571 | if (!data) | |
1572 | goto out_bad; | |
1573 | ||
1574 | /* Set up the argument struct */ | |
f453a54a FI |
1575 | nfs_init_commit(data, head, NULL, cinfo); |
1576 | atomic_inc(&cinfo->mds->rpcs_out); | |
9f0ec176 AA |
1577 | return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops, |
1578 | how, 0); | |
1da177e4 | 1579 | out_bad: |
ea2cf228 | 1580 | nfs_retry_commit(head, NULL, cinfo); |
f453a54a | 1581 | cinfo->completion_ops->error_cleanup(NFS_I(inode)); |
1da177e4 LT |
1582 | return -ENOMEM; |
1583 | } | |
1584 | ||
1585 | /* | |
1586 | * COMMIT call returned | |
1587 | */ | |
788e7a89 | 1588 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1589 | { |
0b7c0153 | 1590 | struct nfs_commit_data *data = calldata; |
1da177e4 | 1591 | |
a3f565b1 | 1592 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1593 | task->tk_pid, task->tk_status); |
1594 | ||
788e7a89 | 1595 | /* Call the NFS version-specific code */ |
c0d0e96b | 1596 | NFS_PROTO(data->inode)->commit_done(task, data); |
c9d8f89d TM |
1597 | } |
1598 | ||
f453a54a | 1599 | static void nfs_commit_release_pages(struct nfs_commit_data *data) |
c9d8f89d | 1600 | { |
5917ce84 | 1601 | struct nfs_page *req; |
c9d8f89d | 1602 | int status = data->task.tk_status; |
f453a54a | 1603 | struct nfs_commit_info cinfo; |
788e7a89 | 1604 | |
1da177e4 LT |
1605 | while (!list_empty(&data->pages)) { |
1606 | req = nfs_list_entry(data->pages.next); | |
1607 | nfs_list_remove_request(req); | |
d6d6dc7c | 1608 | nfs_clear_page_commit(req->wb_page); |
1da177e4 | 1609 | |
1e8968c5 | 1610 | dprintk("NFS: commit (%s/%llu %d@%lld)", |
3d4ff43d | 1611 | req->wb_context->dentry->d_sb->s_id, |
1e8968c5 | 1612 | (unsigned long long)NFS_FILEID(req->wb_context->dentry->d_inode), |
1da177e4 LT |
1613 | req->wb_bytes, |
1614 | (long long)req_offset(req)); | |
c9d8f89d TM |
1615 | if (status < 0) { |
1616 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1617 | nfs_inode_remove_request(req); |
c9d8f89d | 1618 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1619 | goto next; |
1620 | } | |
1621 | ||
1622 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1623 | * returned by the server against all stored verfs. */ | |
2f2c63bc | 1624 | if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) { |
1da177e4 LT |
1625 | /* We have a match */ |
1626 | nfs_inode_remove_request(req); | |
1627 | dprintk(" OK\n"); | |
1628 | goto next; | |
1629 | } | |
1630 | /* We have a mismatch. Write the page again */ | |
1631 | dprintk(" mismatch\n"); | |
6d884e8f | 1632 | nfs_mark_request_dirty(req); |
05990d1b | 1633 | set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags); |
1da177e4 | 1634 | next: |
1d1afcbc | 1635 | nfs_unlock_and_release_request(req); |
1da177e4 | 1636 | } |
f453a54a FI |
1637 | nfs_init_cinfo(&cinfo, data->inode, data->dreq); |
1638 | if (atomic_dec_and_test(&cinfo.mds->rpcs_out)) | |
1639 | nfs_commit_clear_lock(NFS_I(data->inode)); | |
5917ce84 FI |
1640 | } |
1641 | ||
1642 | static void nfs_commit_release(void *calldata) | |
1643 | { | |
0b7c0153 | 1644 | struct nfs_commit_data *data = calldata; |
5917ce84 | 1645 | |
f453a54a | 1646 | data->completion_ops->completion(data); |
c9d8f89d | 1647 | nfs_commitdata_release(calldata); |
1da177e4 | 1648 | } |
788e7a89 TM |
1649 | |
1650 | static const struct rpc_call_ops nfs_commit_ops = { | |
0b7c0153 | 1651 | .rpc_call_prepare = nfs_commit_prepare, |
788e7a89 TM |
1652 | .rpc_call_done = nfs_commit_done, |
1653 | .rpc_release = nfs_commit_release, | |
1654 | }; | |
1da177e4 | 1655 | |
f453a54a FI |
1656 | static const struct nfs_commit_completion_ops nfs_commit_completion_ops = { |
1657 | .completion = nfs_commit_release_pages, | |
1658 | .error_cleanup = nfs_commit_clear_lock, | |
1659 | }; | |
1660 | ||
1763da12 FI |
1661 | int nfs_generic_commit_list(struct inode *inode, struct list_head *head, |
1662 | int how, struct nfs_commit_info *cinfo) | |
84c53ab5 FI |
1663 | { |
1664 | int status; | |
1665 | ||
ea2cf228 | 1666 | status = pnfs_commit_list(inode, head, how, cinfo); |
84c53ab5 | 1667 | if (status == PNFS_NOT_ATTEMPTED) |
ea2cf228 | 1668 | status = nfs_commit_list(inode, head, how, cinfo); |
84c53ab5 FI |
1669 | return status; |
1670 | } | |
1671 | ||
b608b283 | 1672 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1673 | { |
1da177e4 | 1674 | LIST_HEAD(head); |
ea2cf228 | 1675 | struct nfs_commit_info cinfo; |
71d0a611 | 1676 | int may_wait = how & FLUSH_SYNC; |
b8413f98 | 1677 | int res; |
1da177e4 | 1678 | |
b8413f98 TM |
1679 | res = nfs_commit_set_lock(NFS_I(inode), may_wait); |
1680 | if (res <= 0) | |
c5efa5fc | 1681 | goto out_mark_dirty; |
ea2cf228 FI |
1682 | nfs_init_cinfo_from_inode(&cinfo, inode); |
1683 | res = nfs_scan_commit(inode, &head, &cinfo); | |
1da177e4 | 1684 | if (res) { |
a861a1e1 FI |
1685 | int error; |
1686 | ||
ea2cf228 | 1687 | error = nfs_generic_commit_list(inode, &head, how, &cinfo); |
3da28eb1 TM |
1688 | if (error < 0) |
1689 | return error; | |
b8413f98 | 1690 | if (!may_wait) |
c5efa5fc | 1691 | goto out_mark_dirty; |
b8413f98 TM |
1692 | error = wait_on_bit(&NFS_I(inode)->flags, |
1693 | NFS_INO_COMMIT, | |
1694 | nfs_wait_bit_killable, | |
1695 | TASK_KILLABLE); | |
1696 | if (error < 0) | |
1697 | return error; | |
71d0a611 TM |
1698 | } else |
1699 | nfs_commit_clear_lock(NFS_I(inode)); | |
c5efa5fc TM |
1700 | return res; |
1701 | /* Note: If we exit without ensuring that the commit is complete, | |
1702 | * we must mark the inode as dirty. Otherwise, future calls to | |
1703 | * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure | |
1704 | * that the data is on the disk. | |
1705 | */ | |
1706 | out_mark_dirty: | |
1707 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
1da177e4 LT |
1708 | return res; |
1709 | } | |
8fc795f7 TM |
1710 | |
1711 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) | |
1712 | { | |
420e3646 TM |
1713 | struct nfs_inode *nfsi = NFS_I(inode); |
1714 | int flags = FLUSH_SYNC; | |
1715 | int ret = 0; | |
8fc795f7 | 1716 | |
3236c3e1 | 1717 | /* no commits means nothing needs to be done */ |
ea2cf228 | 1718 | if (!nfsi->commit_info.ncommit) |
3236c3e1 JL |
1719 | return ret; |
1720 | ||
a00dd6c0 JL |
1721 | if (wbc->sync_mode == WB_SYNC_NONE) { |
1722 | /* Don't commit yet if this is a non-blocking flush and there | |
1723 | * are a lot of outstanding writes for this mapping. | |
1724 | */ | |
ea2cf228 | 1725 | if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1)) |
a00dd6c0 | 1726 | goto out_mark_dirty; |
420e3646 | 1727 | |
a00dd6c0 | 1728 | /* don't wait for the COMMIT response */ |
420e3646 | 1729 | flags = 0; |
a00dd6c0 JL |
1730 | } |
1731 | ||
420e3646 TM |
1732 | ret = nfs_commit_inode(inode, flags); |
1733 | if (ret >= 0) { | |
1734 | if (wbc->sync_mode == WB_SYNC_NONE) { | |
1735 | if (ret < wbc->nr_to_write) | |
1736 | wbc->nr_to_write -= ret; | |
1737 | else | |
1738 | wbc->nr_to_write = 0; | |
1739 | } | |
8fc795f7 | 1740 | return 0; |
420e3646 TM |
1741 | } |
1742 | out_mark_dirty: | |
8fc795f7 TM |
1743 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1744 | return ret; | |
1745 | } | |
c63c7b05 | 1746 | #else |
8fc795f7 TM |
1747 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) |
1748 | { | |
1749 | return 0; | |
1750 | } | |
1da177e4 LT |
1751 | #endif |
1752 | ||
8fc795f7 TM |
1753 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1754 | { | |
a8d8f02c BS |
1755 | return nfs_commit_unstable_pages(inode, wbc); |
1756 | } | |
89d77c8f | 1757 | EXPORT_SYMBOL_GPL(nfs_write_inode); |
a8d8f02c | 1758 | |
acdc53b2 TM |
1759 | /* |
1760 | * flush the inode to disk. | |
1761 | */ | |
1762 | int nfs_wb_all(struct inode *inode) | |
34901f70 TM |
1763 | { |
1764 | struct writeback_control wbc = { | |
72cb77f4 | 1765 | .sync_mode = WB_SYNC_ALL, |
34901f70 | 1766 | .nr_to_write = LONG_MAX, |
d7fb1207 TM |
1767 | .range_start = 0, |
1768 | .range_end = LLONG_MAX, | |
34901f70 | 1769 | }; |
f4ce1299 TM |
1770 | int ret; |
1771 | ||
1772 | trace_nfs_writeback_inode_enter(inode); | |
1773 | ||
1774 | ret = sync_inode(inode, &wbc); | |
34901f70 | 1775 | |
f4ce1299 TM |
1776 | trace_nfs_writeback_inode_exit(inode, ret); |
1777 | return ret; | |
1c75950b | 1778 | } |
ddda8e0a | 1779 | EXPORT_SYMBOL_GPL(nfs_wb_all); |
1c75950b | 1780 | |
1b3b4a1a TM |
1781 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1782 | { | |
1783 | struct nfs_page *req; | |
1b3b4a1a TM |
1784 | int ret = 0; |
1785 | ||
3e217045 WAA |
1786 | wait_on_page_writeback(page); |
1787 | ||
1788 | /* blocking call to cancel all requests and join to a single (head) | |
1789 | * request */ | |
1790 | req = nfs_lock_and_join_requests(page, false); | |
1791 | ||
1792 | if (IS_ERR(req)) { | |
1793 | ret = PTR_ERR(req); | |
1794 | } else if (req) { | |
1795 | /* all requests from this page have been cancelled by | |
1796 | * nfs_lock_and_join_requests, so just remove the head | |
1797 | * request from the inode / page_private pointer and | |
1798 | * release it */ | |
1799 | nfs_inode_remove_request(req); | |
1800 | /* | |
1801 | * In case nfs_inode_remove_request has marked the | |
1802 | * page as being dirty | |
1803 | */ | |
1804 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1805 | nfs_unlock_and_release_request(req); | |
1b3b4a1a | 1806 | } |
3e217045 | 1807 | |
1b3b4a1a TM |
1808 | return ret; |
1809 | } | |
1810 | ||
7f2f12d9 TM |
1811 | /* |
1812 | * Write back all requests on one page - we do this before reading it. | |
1813 | */ | |
1814 | int nfs_wb_page(struct inode *inode, struct page *page) | |
1c75950b | 1815 | { |
29418aa4 | 1816 | loff_t range_start = page_file_offset(page); |
1c75950b | 1817 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); |
4d770ccf | 1818 | struct writeback_control wbc = { |
4d770ccf | 1819 | .sync_mode = WB_SYNC_ALL, |
7f2f12d9 | 1820 | .nr_to_write = 0, |
4d770ccf TM |
1821 | .range_start = range_start, |
1822 | .range_end = range_end, | |
1823 | }; | |
1824 | int ret; | |
1c75950b | 1825 | |
f4ce1299 TM |
1826 | trace_nfs_writeback_page_enter(inode); |
1827 | ||
0522f6ad | 1828 | for (;;) { |
ba8b06e6 | 1829 | wait_on_page_writeback(page); |
73e3302f TM |
1830 | if (clear_page_dirty_for_io(page)) { |
1831 | ret = nfs_writepage_locked(page, &wbc); | |
1832 | if (ret < 0) | |
1833 | goto out_error; | |
0522f6ad | 1834 | continue; |
7f2f12d9 | 1835 | } |
f4ce1299 | 1836 | ret = 0; |
0522f6ad TM |
1837 | if (!PagePrivate(page)) |
1838 | break; | |
1839 | ret = nfs_commit_inode(inode, FLUSH_SYNC); | |
ba8b06e6 | 1840 | if (ret < 0) |
73e3302f | 1841 | goto out_error; |
7f2f12d9 | 1842 | } |
73e3302f | 1843 | out_error: |
f4ce1299 | 1844 | trace_nfs_writeback_page_exit(inode, ret); |
4d770ccf | 1845 | return ret; |
1c75950b TM |
1846 | } |
1847 | ||
074cc1de TM |
1848 | #ifdef CONFIG_MIGRATION |
1849 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, | |
a6bc32b8 | 1850 | struct page *page, enum migrate_mode mode) |
074cc1de | 1851 | { |
2da95652 JL |
1852 | /* |
1853 | * If PagePrivate is set, then the page is currently associated with | |
1854 | * an in-progress read or write request. Don't try to migrate it. | |
1855 | * | |
1856 | * FIXME: we could do this in principle, but we'll need a way to ensure | |
1857 | * that we can safely release the inode reference while holding | |
1858 | * the page lock. | |
1859 | */ | |
1860 | if (PagePrivate(page)) | |
1861 | return -EBUSY; | |
074cc1de | 1862 | |
8c209ce7 DH |
1863 | if (!nfs_fscache_release_page(page, GFP_KERNEL)) |
1864 | return -EBUSY; | |
074cc1de | 1865 | |
a6bc32b8 | 1866 | return migrate_page(mapping, newpage, page, mode); |
074cc1de TM |
1867 | } |
1868 | #endif | |
1869 | ||
f7b422b1 | 1870 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1871 | { |
1872 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1e7f3a48 | 1873 | sizeof(struct nfs_pgio_header), |
1da177e4 | 1874 | 0, SLAB_HWCACHE_ALIGN, |
20c2df83 | 1875 | NULL); |
1da177e4 LT |
1876 | if (nfs_wdata_cachep == NULL) |
1877 | return -ENOMEM; | |
1878 | ||
93d2341c MD |
1879 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1880 | nfs_wdata_cachep); | |
1da177e4 | 1881 | if (nfs_wdata_mempool == NULL) |
3dd4765f | 1882 | goto out_destroy_write_cache; |
1da177e4 | 1883 | |
0b7c0153 FI |
1884 | nfs_cdata_cachep = kmem_cache_create("nfs_commit_data", |
1885 | sizeof(struct nfs_commit_data), | |
1886 | 0, SLAB_HWCACHE_ALIGN, | |
1887 | NULL); | |
1888 | if (nfs_cdata_cachep == NULL) | |
3dd4765f | 1889 | goto out_destroy_write_mempool; |
0b7c0153 | 1890 | |
93d2341c | 1891 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
4c100210 | 1892 | nfs_cdata_cachep); |
1da177e4 | 1893 | if (nfs_commit_mempool == NULL) |
3dd4765f | 1894 | goto out_destroy_commit_cache; |
1da177e4 | 1895 | |
89a09141 PZ |
1896 | /* |
1897 | * NFS congestion size, scale with available memory. | |
1898 | * | |
1899 | * 64MB: 8192k | |
1900 | * 128MB: 11585k | |
1901 | * 256MB: 16384k | |
1902 | * 512MB: 23170k | |
1903 | * 1GB: 32768k | |
1904 | * 2GB: 46340k | |
1905 | * 4GB: 65536k | |
1906 | * 8GB: 92681k | |
1907 | * 16GB: 131072k | |
1908 | * | |
1909 | * This allows larger machines to have larger/more transfers. | |
1910 | * Limit the default to 256M | |
1911 | */ | |
1912 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1913 | if (nfs_congestion_kb > 256*1024) | |
1914 | nfs_congestion_kb = 256*1024; | |
1915 | ||
1da177e4 | 1916 | return 0; |
3dd4765f JL |
1917 | |
1918 | out_destroy_commit_cache: | |
1919 | kmem_cache_destroy(nfs_cdata_cachep); | |
1920 | out_destroy_write_mempool: | |
1921 | mempool_destroy(nfs_wdata_mempool); | |
1922 | out_destroy_write_cache: | |
1923 | kmem_cache_destroy(nfs_wdata_cachep); | |
1924 | return -ENOMEM; | |
1da177e4 LT |
1925 | } |
1926 | ||
266bee88 | 1927 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1928 | { |
1929 | mempool_destroy(nfs_commit_mempool); | |
3dd4765f | 1930 | kmem_cache_destroy(nfs_cdata_cachep); |
1da177e4 | 1931 | mempool_destroy(nfs_wdata_mempool); |
1a1d92c1 | 1932 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1933 | } |
1934 | ||
4a0de55c | 1935 | static const struct nfs_rw_ops nfs_rw_write_ops = { |
a4cdda59 | 1936 | .rw_mode = FMODE_WRITE, |
4a0de55c AS |
1937 | .rw_alloc_header = nfs_writehdr_alloc, |
1938 | .rw_free_header = nfs_writehdr_free, | |
a4cdda59 | 1939 | .rw_release = nfs_writeback_release_common, |
0eecb214 AS |
1940 | .rw_done = nfs_writeback_done, |
1941 | .rw_result = nfs_writeback_result, | |
1ed26f33 | 1942 | .rw_initiate = nfs_initiate_write, |
4a0de55c | 1943 | }; |