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 AM |
22 | #include <linux/backing-dev.h> |
23 | ||
1da177e4 | 24 | #include <asm/uaccess.h> |
1da177e4 LT |
25 | |
26 | #include "delegation.h" | |
49a70f27 | 27 | #include "internal.h" |
91d5b470 | 28 | #include "iostat.h" |
def6ed7e | 29 | #include "nfs4_fs.h" |
074cc1de | 30 | #include "fscache.h" |
1da177e4 LT |
31 | |
32 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
33 | ||
34 | #define MIN_POOL_WRITE (32) | |
35 | #define MIN_POOL_COMMIT (4) | |
36 | ||
37 | /* | |
38 | * Local function declarations | |
39 | */ | |
c63c7b05 TM |
40 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
41 | struct inode *inode, int ioflags); | |
f8512ad0 | 42 | static void nfs_redirty_request(struct nfs_page *req); |
788e7a89 TM |
43 | static const struct rpc_call_ops nfs_write_partial_ops; |
44 | static const struct rpc_call_ops nfs_write_full_ops; | |
45 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 | 46 | |
e18b890b | 47 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 48 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
49 | static mempool_t *nfs_commit_mempool; |
50 | ||
c9d8f89d | 51 | struct nfs_write_data *nfs_commitdata_alloc(void) |
1da177e4 | 52 | { |
e6b4f8da | 53 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
40859d7e | 54 | |
1da177e4 LT |
55 | if (p) { |
56 | memset(p, 0, sizeof(*p)); | |
57 | INIT_LIST_HEAD(&p->pages); | |
5f7dbd5c | 58 | p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE; |
1da177e4 LT |
59 | } |
60 | return p; | |
61 | } | |
62 | ||
5e4424af | 63 | void nfs_commit_free(struct nfs_write_data *p) |
1da177e4 | 64 | { |
40859d7e CL |
65 | if (p && (p->pagevec != &p->page_array[0])) |
66 | kfree(p->pagevec); | |
1da177e4 LT |
67 | mempool_free(p, nfs_commit_mempool); |
68 | } | |
69 | ||
8d5658c9 | 70 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
3feb2d49 | 71 | { |
e6b4f8da | 72 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
73 | |
74 | if (p) { | |
75 | memset(p, 0, sizeof(*p)); | |
76 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 77 | p->npages = pagecount; |
5f7dbd5c | 78 | p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE; |
0d0b5cb3 CL |
79 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
80 | p->pagevec = p->page_array; | |
3feb2d49 | 81 | else { |
0d0b5cb3 CL |
82 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
83 | if (!p->pagevec) { | |
3feb2d49 TM |
84 | mempool_free(p, nfs_wdata_mempool); |
85 | p = NULL; | |
86 | } | |
87 | } | |
88 | } | |
89 | return p; | |
90 | } | |
91 | ||
1ae88b2e | 92 | void nfs_writedata_free(struct nfs_write_data *p) |
3feb2d49 TM |
93 | { |
94 | if (p && (p->pagevec != &p->page_array[0])) | |
95 | kfree(p->pagevec); | |
96 | mempool_free(p, nfs_wdata_mempool); | |
97 | } | |
98 | ||
1ae88b2e | 99 | static void nfs_writedata_release(struct nfs_write_data *wdata) |
1da177e4 | 100 | { |
383ba719 | 101 | put_nfs_open_context(wdata->args.context); |
1da177e4 LT |
102 | nfs_writedata_free(wdata); |
103 | } | |
104 | ||
7b159fc1 TM |
105 | static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error) |
106 | { | |
107 | ctx->error = error; | |
108 | smp_wmb(); | |
109 | set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
110 | } | |
111 | ||
277459d2 TM |
112 | static struct nfs_page *nfs_page_find_request_locked(struct page *page) |
113 | { | |
114 | struct nfs_page *req = NULL; | |
115 | ||
116 | if (PagePrivate(page)) { | |
117 | req = (struct nfs_page *)page_private(page); | |
118 | if (req != NULL) | |
c03b4024 | 119 | kref_get(&req->wb_kref); |
277459d2 TM |
120 | } |
121 | return req; | |
122 | } | |
123 | ||
124 | static struct nfs_page *nfs_page_find_request(struct page *page) | |
125 | { | |
587142f8 | 126 | struct inode *inode = page->mapping->host; |
277459d2 | 127 | struct nfs_page *req = NULL; |
277459d2 | 128 | |
587142f8 | 129 | spin_lock(&inode->i_lock); |
277459d2 | 130 | req = nfs_page_find_request_locked(page); |
587142f8 | 131 | spin_unlock(&inode->i_lock); |
277459d2 TM |
132 | return req; |
133 | } | |
134 | ||
1da177e4 LT |
135 | /* Adjust the file length if we're writing beyond the end */ |
136 | static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count) | |
137 | { | |
138 | struct inode *inode = page->mapping->host; | |
a3d01454 TM |
139 | loff_t end, i_size; |
140 | pgoff_t end_index; | |
1da177e4 | 141 | |
a3d01454 TM |
142 | spin_lock(&inode->i_lock); |
143 | i_size = i_size_read(inode); | |
144 | end_index = (i_size - 1) >> PAGE_CACHE_SHIFT; | |
1da177e4 | 145 | if (i_size > 0 && page->index < end_index) |
a3d01454 | 146 | goto out; |
1da177e4 LT |
147 | end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count); |
148 | if (i_size >= end) | |
a3d01454 | 149 | goto out; |
1da177e4 | 150 | i_size_write(inode, end); |
a3d01454 TM |
151 | nfs_inc_stats(inode, NFSIOS_EXTENDWRITE); |
152 | out: | |
153 | spin_unlock(&inode->i_lock); | |
1da177e4 LT |
154 | } |
155 | ||
a301b777 TM |
156 | /* A writeback failed: mark the page as bad, and invalidate the page cache */ |
157 | static void nfs_set_pageerror(struct page *page) | |
158 | { | |
159 | SetPageError(page); | |
160 | nfs_zap_mapping(page->mapping->host, page->mapping); | |
161 | } | |
162 | ||
1da177e4 LT |
163 | /* We can set the PG_uptodate flag if we see that a write request |
164 | * covers the full page. | |
165 | */ | |
166 | static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count) | |
167 | { | |
1da177e4 LT |
168 | if (PageUptodate(page)) |
169 | return; | |
170 | if (base != 0) | |
171 | return; | |
49a70f27 | 172 | if (count != nfs_page_length(page)) |
1da177e4 | 173 | return; |
49a70f27 | 174 | SetPageUptodate(page); |
1da177e4 LT |
175 | } |
176 | ||
1da177e4 LT |
177 | static int wb_priority(struct writeback_control *wbc) |
178 | { | |
179 | if (wbc->for_reclaim) | |
c63c7b05 | 180 | return FLUSH_HIGHPRI | FLUSH_STABLE; |
b17621fe | 181 | if (wbc->for_kupdate || wbc->for_background) |
1da177e4 LT |
182 | return FLUSH_LOWPRI; |
183 | return 0; | |
184 | } | |
185 | ||
89a09141 PZ |
186 | /* |
187 | * NFS congestion control | |
188 | */ | |
189 | ||
190 | int nfs_congestion_kb; | |
191 | ||
192 | #define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10)) | |
193 | #define NFS_CONGESTION_OFF_THRESH \ | |
194 | (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2)) | |
195 | ||
5a6d41b3 | 196 | static int nfs_set_page_writeback(struct page *page) |
89a09141 | 197 | { |
5a6d41b3 TM |
198 | int ret = test_set_page_writeback(page); |
199 | ||
200 | if (!ret) { | |
89a09141 PZ |
201 | struct inode *inode = page->mapping->host; |
202 | struct nfs_server *nfss = NFS_SERVER(inode); | |
203 | ||
277866a0 | 204 | if (atomic_long_inc_return(&nfss->writeback) > |
8aa7e847 JA |
205 | NFS_CONGESTION_ON_THRESH) { |
206 | set_bdi_congested(&nfss->backing_dev_info, | |
207 | BLK_RW_ASYNC); | |
208 | } | |
89a09141 | 209 | } |
5a6d41b3 | 210 | return ret; |
89a09141 PZ |
211 | } |
212 | ||
213 | static void nfs_end_page_writeback(struct page *page) | |
214 | { | |
215 | struct inode *inode = page->mapping->host; | |
216 | struct nfs_server *nfss = NFS_SERVER(inode); | |
217 | ||
218 | end_page_writeback(page); | |
c4dc4bee | 219 | if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH) |
8aa7e847 | 220 | clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC); |
89a09141 PZ |
221 | } |
222 | ||
074cc1de | 223 | static struct nfs_page *nfs_find_and_lock_request(struct page *page) |
e261f51f | 224 | { |
587142f8 | 225 | struct inode *inode = page->mapping->host; |
e261f51f | 226 | struct nfs_page *req; |
e261f51f TM |
227 | int ret; |
228 | ||
587142f8 | 229 | spin_lock(&inode->i_lock); |
074cc1de | 230 | for (;;) { |
e261f51f | 231 | req = nfs_page_find_request_locked(page); |
074cc1de TM |
232 | if (req == NULL) |
233 | break; | |
acee478a | 234 | if (nfs_set_page_tag_locked(req)) |
e261f51f TM |
235 | break; |
236 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
acee478a | 237 | * then the call to nfs_set_page_tag_locked() will always |
e261f51f TM |
238 | * succeed provided that someone hasn't already marked the |
239 | * request as dirty (in which case we don't care). | |
240 | */ | |
587142f8 | 241 | spin_unlock(&inode->i_lock); |
e261f51f TM |
242 | ret = nfs_wait_on_request(req); |
243 | nfs_release_request(req); | |
244 | if (ret != 0) | |
074cc1de | 245 | return ERR_PTR(ret); |
587142f8 | 246 | spin_lock(&inode->i_lock); |
e261f51f | 247 | } |
587142f8 | 248 | spin_unlock(&inode->i_lock); |
074cc1de TM |
249 | return req; |
250 | } | |
251 | ||
252 | /* | |
253 | * Find an associated nfs write request, and prepare to flush it out | |
254 | * May return an error if the user signalled nfs_wait_on_request(). | |
255 | */ | |
256 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, | |
257 | struct page *page) | |
258 | { | |
259 | struct nfs_page *req; | |
260 | int ret = 0; | |
261 | ||
262 | req = nfs_find_and_lock_request(page); | |
263 | if (!req) | |
264 | goto out; | |
265 | ret = PTR_ERR(req); | |
266 | if (IS_ERR(req)) | |
267 | goto out; | |
268 | ||
269 | ret = nfs_set_page_writeback(page); | |
270 | BUG_ON(ret != 0); | |
271 | BUG_ON(test_bit(PG_CLEAN, &req->wb_flags)); | |
272 | ||
f8512ad0 FI |
273 | if (!nfs_pageio_add_request(pgio, req)) { |
274 | nfs_redirty_request(req); | |
074cc1de | 275 | ret = pgio->pg_error; |
f8512ad0 | 276 | } |
074cc1de TM |
277 | out: |
278 | return ret; | |
e261f51f TM |
279 | } |
280 | ||
f758c885 | 281 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 282 | { |
1da177e4 | 283 | struct inode *inode = page->mapping->host; |
1da177e4 | 284 | |
91d5b470 CL |
285 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
286 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
287 | ||
7fe7f848 | 288 | nfs_pageio_cond_complete(pgio, page->index); |
f758c885 TM |
289 | return nfs_page_async_flush(pgio, page); |
290 | } | |
7fe7f848 | 291 | |
f758c885 TM |
292 | /* |
293 | * Write an mmapped page to the server. | |
294 | */ | |
295 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
296 | { | |
297 | struct nfs_pageio_descriptor pgio; | |
298 | int err; | |
49a70f27 | 299 | |
f758c885 TM |
300 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
301 | err = nfs_do_writepage(page, wbc, &pgio); | |
302 | nfs_pageio_complete(&pgio); | |
303 | if (err < 0) | |
304 | return err; | |
305 | if (pgio.pg_error < 0) | |
306 | return pgio.pg_error; | |
307 | return 0; | |
4d770ccf TM |
308 | } |
309 | ||
310 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
311 | { | |
f758c885 | 312 | int ret; |
4d770ccf | 313 | |
f758c885 | 314 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 315 | unlock_page(page); |
f758c885 TM |
316 | return ret; |
317 | } | |
318 | ||
319 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
320 | { | |
321 | int ret; | |
322 | ||
323 | ret = nfs_do_writepage(page, wbc, data); | |
324 | unlock_page(page); | |
325 | return ret; | |
1da177e4 LT |
326 | } |
327 | ||
1da177e4 LT |
328 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
329 | { | |
1da177e4 | 330 | struct inode *inode = mapping->host; |
72cb77f4 | 331 | unsigned long *bitlock = &NFS_I(inode)->flags; |
c63c7b05 | 332 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
333 | int err; |
334 | ||
72cb77f4 TM |
335 | /* Stop dirtying of new pages while we sync */ |
336 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, | |
337 | nfs_wait_bit_killable, TASK_KILLABLE); | |
338 | if (err) | |
339 | goto out_err; | |
340 | ||
91d5b470 CL |
341 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
342 | ||
c63c7b05 | 343 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 344 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 345 | nfs_pageio_complete(&pgio); |
72cb77f4 TM |
346 | |
347 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); | |
348 | smp_mb__after_clear_bit(); | |
349 | wake_up_bit(bitlock, NFS_INO_FLUSHING); | |
350 | ||
f758c885 | 351 | if (err < 0) |
72cb77f4 TM |
352 | goto out_err; |
353 | err = pgio.pg_error; | |
354 | if (err < 0) | |
355 | goto out_err; | |
c63c7b05 | 356 | return 0; |
72cb77f4 TM |
357 | out_err: |
358 | return err; | |
1da177e4 LT |
359 | } |
360 | ||
361 | /* | |
362 | * Insert a write request into an inode | |
363 | */ | |
e7d39069 | 364 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
1da177e4 LT |
365 | { |
366 | struct nfs_inode *nfsi = NFS_I(inode); | |
367 | int error; | |
368 | ||
e7d39069 TM |
369 | error = radix_tree_preload(GFP_NOFS); |
370 | if (error != 0) | |
371 | goto out; | |
372 | ||
373 | /* Lock the request! */ | |
374 | nfs_lock_request_dontget(req); | |
375 | ||
376 | spin_lock(&inode->i_lock); | |
1da177e4 | 377 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); |
27852596 | 378 | BUG_ON(error); |
1da177e4 LT |
379 | if (!nfsi->npages) { |
380 | igrab(inode); | |
1da177e4 LT |
381 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
382 | nfsi->change_attr++; | |
383 | } | |
deb7d638 | 384 | SetPagePrivate(req->wb_page); |
277459d2 | 385 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 386 | nfsi->npages++; |
c03b4024 | 387 | kref_get(&req->wb_kref); |
27852596 NP |
388 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
389 | NFS_PAGE_TAG_LOCKED); | |
e7d39069 TM |
390 | spin_unlock(&inode->i_lock); |
391 | radix_tree_preload_end(); | |
392 | out: | |
393 | return error; | |
1da177e4 LT |
394 | } |
395 | ||
396 | /* | |
89a09141 | 397 | * Remove a write request from an inode |
1da177e4 LT |
398 | */ |
399 | static void nfs_inode_remove_request(struct nfs_page *req) | |
400 | { | |
88be9f99 | 401 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
402 | struct nfs_inode *nfsi = NFS_I(inode); |
403 | ||
404 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
405 | ||
587142f8 | 406 | spin_lock(&inode->i_lock); |
277459d2 | 407 | set_page_private(req->wb_page, 0); |
deb7d638 | 408 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
409 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
410 | nfsi->npages--; | |
411 | if (!nfsi->npages) { | |
587142f8 | 412 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
413 | iput(inode); |
414 | } else | |
587142f8 | 415 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
416 | nfs_clear_request(req); |
417 | nfs_release_request(req); | |
418 | } | |
419 | ||
61822ab5 | 420 | static void |
6d884e8f | 421 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 422 | { |
61822ab5 TM |
423 | __set_page_dirty_nobuffers(req->wb_page); |
424 | } | |
425 | ||
1da177e4 LT |
426 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
427 | /* | |
428 | * Add a request to the inode's commit list. | |
429 | */ | |
430 | static void | |
431 | nfs_mark_request_commit(struct nfs_page *req) | |
432 | { | |
88be9f99 | 433 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
434 | struct nfs_inode *nfsi = NFS_I(inode); |
435 | ||
587142f8 | 436 | spin_lock(&inode->i_lock); |
e468bae9 | 437 | set_bit(PG_CLEAN, &(req)->wb_flags); |
5c369683 TM |
438 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
439 | req->wb_index, | |
440 | NFS_PAGE_TAG_COMMIT); | |
ff778d02 | 441 | nfsi->ncommit++; |
587142f8 | 442 | spin_unlock(&inode->i_lock); |
fd39fc85 | 443 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 444 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 445 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 446 | } |
8e821cad | 447 | |
e468bae9 TM |
448 | static int |
449 | nfs_clear_request_commit(struct nfs_page *req) | |
450 | { | |
451 | struct page *page = req->wb_page; | |
452 | ||
453 | if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { | |
454 | dec_zone_page_state(page, NR_UNSTABLE_NFS); | |
455 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); | |
456 | return 1; | |
457 | } | |
458 | return 0; | |
459 | } | |
460 | ||
8e821cad TM |
461 | static inline |
462 | int nfs_write_need_commit(struct nfs_write_data *data) | |
463 | { | |
464 | return data->verf.committed != NFS_FILE_SYNC; | |
465 | } | |
466 | ||
467 | static inline | |
468 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
469 | { | |
e468bae9 | 470 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
471 | nfs_mark_request_commit(req); |
472 | return 1; | |
473 | } | |
474 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
6d884e8f | 475 | nfs_mark_request_dirty(req); |
8e821cad TM |
476 | return 1; |
477 | } | |
478 | return 0; | |
479 | } | |
480 | #else | |
481 | static inline void | |
482 | nfs_mark_request_commit(struct nfs_page *req) | |
483 | { | |
484 | } | |
485 | ||
e468bae9 TM |
486 | static inline int |
487 | nfs_clear_request_commit(struct nfs_page *req) | |
488 | { | |
489 | return 0; | |
490 | } | |
491 | ||
8e821cad TM |
492 | static inline |
493 | int nfs_write_need_commit(struct nfs_write_data *data) | |
494 | { | |
495 | return 0; | |
496 | } | |
497 | ||
498 | static inline | |
499 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
500 | { | |
501 | return 0; | |
502 | } | |
1da177e4 LT |
503 | #endif |
504 | ||
505 | /* | |
506 | * Wait for a request to complete. | |
507 | * | |
150030b7 | 508 | * Interruptible by fatal signals only. |
1da177e4 | 509 | */ |
ca52fec1 | 510 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
511 | { |
512 | struct nfs_inode *nfsi = NFS_I(inode); | |
513 | struct nfs_page *req; | |
ca52fec1 | 514 | pgoff_t idx_end, next; |
1da177e4 LT |
515 | unsigned int res = 0; |
516 | int error; | |
517 | ||
518 | if (npages == 0) | |
519 | idx_end = ~0; | |
520 | else | |
521 | idx_end = idx_start + npages - 1; | |
522 | ||
1da177e4 | 523 | next = idx_start; |
9fd367f0 | 524 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { |
1da177e4 LT |
525 | if (req->wb_index > idx_end) |
526 | break; | |
527 | ||
528 | next = req->wb_index + 1; | |
c6a556b8 | 529 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 | 530 | |
c03b4024 | 531 | kref_get(&req->wb_kref); |
587142f8 | 532 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
533 | error = nfs_wait_on_request(req); |
534 | nfs_release_request(req); | |
587142f8 | 535 | spin_lock(&inode->i_lock); |
1da177e4 LT |
536 | if (error < 0) |
537 | return error; | |
1da177e4 LT |
538 | res++; |
539 | } | |
1da177e4 LT |
540 | return res; |
541 | } | |
542 | ||
47c62564 | 543 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
fb8a1f11 TM |
544 | static int |
545 | nfs_need_commit(struct nfs_inode *nfsi) | |
546 | { | |
547 | return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); | |
548 | } | |
549 | ||
1da177e4 LT |
550 | /* |
551 | * nfs_scan_commit - Scan an inode for commit requests | |
552 | * @inode: NFS inode to scan | |
553 | * @dst: destination list | |
554 | * @idx_start: lower bound of page->index to scan. | |
555 | * @npages: idx_start + npages sets the upper bound to scan. | |
556 | * | |
557 | * Moves requests from the inode's 'commit' request list. | |
558 | * The requests are *not* checked to ensure that they form a contiguous set. | |
559 | */ | |
560 | static int | |
ca52fec1 | 561 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
562 | { |
563 | struct nfs_inode *nfsi = NFS_I(inode); | |
ff778d02 | 564 | int ret; |
3da28eb1 | 565 | |
fb8a1f11 TM |
566 | if (!nfs_need_commit(nfsi)) |
567 | return 0; | |
568 | ||
ff778d02 TM |
569 | ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); |
570 | if (ret > 0) | |
571 | nfsi->ncommit -= ret; | |
2928db1f TM |
572 | if (nfs_need_commit(NFS_I(inode))) |
573 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); | |
ff778d02 | 574 | return ret; |
1da177e4 | 575 | } |
c42de9dd | 576 | #else |
fb8a1f11 TM |
577 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
578 | { | |
579 | return 0; | |
580 | } | |
581 | ||
ca52fec1 | 582 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
583 | { |
584 | return 0; | |
585 | } | |
1da177e4 LT |
586 | #endif |
587 | ||
1da177e4 | 588 | /* |
e7d39069 TM |
589 | * Search for an existing write request, and attempt to update |
590 | * it to reflect a new dirty region on a given page. | |
1da177e4 | 591 | * |
e7d39069 TM |
592 | * If the attempt fails, then the existing request is flushed out |
593 | * to disk. | |
1da177e4 | 594 | */ |
e7d39069 TM |
595 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
596 | struct page *page, | |
597 | unsigned int offset, | |
598 | unsigned int bytes) | |
1da177e4 | 599 | { |
e7d39069 TM |
600 | struct nfs_page *req; |
601 | unsigned int rqend; | |
602 | unsigned int end; | |
603 | int error; | |
604 | ||
605 | if (!PagePrivate(page)) | |
606 | return NULL; | |
1da177e4 LT |
607 | |
608 | end = offset + bytes; | |
e7d39069 | 609 | spin_lock(&inode->i_lock); |
1da177e4 | 610 | |
1da177e4 | 611 | for (;;) { |
277459d2 | 612 | req = nfs_page_find_request_locked(page); |
e7d39069 TM |
613 | if (req == NULL) |
614 | goto out_unlock; | |
615 | ||
616 | rqend = req->wb_offset + req->wb_bytes; | |
617 | /* | |
618 | * Tell the caller to flush out the request if | |
619 | * the offsets are non-contiguous. | |
620 | * Note: nfs_flush_incompatible() will already | |
621 | * have flushed out requests having wrong owners. | |
622 | */ | |
e468bae9 | 623 | if (offset > rqend |
e7d39069 TM |
624 | || end < req->wb_offset) |
625 | goto out_flushme; | |
626 | ||
627 | if (nfs_set_page_tag_locked(req)) | |
1da177e4 | 628 | break; |
1da177e4 | 629 | |
e7d39069 | 630 | /* The request is locked, so wait and then retry */ |
587142f8 | 631 | spin_unlock(&inode->i_lock); |
e7d39069 TM |
632 | error = nfs_wait_on_request(req); |
633 | nfs_release_request(req); | |
634 | if (error != 0) | |
635 | goto out_err; | |
636 | spin_lock(&inode->i_lock); | |
1da177e4 LT |
637 | } |
638 | ||
ff778d02 TM |
639 | if (nfs_clear_request_commit(req) && |
640 | radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, | |
641 | req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) | |
642 | NFS_I(inode)->ncommit--; | |
e468bae9 | 643 | |
1da177e4 LT |
644 | /* Okay, the request matches. Update the region */ |
645 | if (offset < req->wb_offset) { | |
646 | req->wb_offset = offset; | |
647 | req->wb_pgbase = offset; | |
1da177e4 | 648 | } |
1da177e4 LT |
649 | if (end > rqend) |
650 | req->wb_bytes = end - req->wb_offset; | |
e7d39069 TM |
651 | else |
652 | req->wb_bytes = rqend - req->wb_offset; | |
653 | out_unlock: | |
654 | spin_unlock(&inode->i_lock); | |
655 | return req; | |
656 | out_flushme: | |
657 | spin_unlock(&inode->i_lock); | |
658 | nfs_release_request(req); | |
659 | error = nfs_wb_page(inode, page); | |
660 | out_err: | |
661 | return ERR_PTR(error); | |
662 | } | |
663 | ||
664 | /* | |
665 | * Try to update an existing write request, or create one if there is none. | |
666 | * | |
667 | * Note: Should always be called with the Page Lock held to prevent races | |
668 | * if we have to add a new request. Also assumes that the caller has | |
669 | * already called nfs_flush_incompatible() if necessary. | |
670 | */ | |
671 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, | |
672 | struct page *page, unsigned int offset, unsigned int bytes) | |
673 | { | |
674 | struct inode *inode = page->mapping->host; | |
675 | struct nfs_page *req; | |
676 | int error; | |
1da177e4 | 677 | |
e7d39069 TM |
678 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
679 | if (req != NULL) | |
680 | goto out; | |
681 | req = nfs_create_request(ctx, inode, page, offset, bytes); | |
682 | if (IS_ERR(req)) | |
683 | goto out; | |
684 | error = nfs_inode_add_request(inode, req); | |
685 | if (error != 0) { | |
686 | nfs_release_request(req); | |
687 | req = ERR_PTR(error); | |
688 | } | |
efc91ed0 | 689 | out: |
61e930a9 | 690 | return req; |
1da177e4 LT |
691 | } |
692 | ||
e7d39069 TM |
693 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
694 | unsigned int offset, unsigned int count) | |
695 | { | |
696 | struct nfs_page *req; | |
697 | ||
698 | req = nfs_setup_write_request(ctx, page, offset, count); | |
699 | if (IS_ERR(req)) | |
700 | return PTR_ERR(req); | |
701 | /* Update file length */ | |
702 | nfs_grow_file(page, offset, count); | |
703 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
704 | nfs_clear_page_tag_locked(req); | |
705 | return 0; | |
706 | } | |
707 | ||
1da177e4 LT |
708 | int nfs_flush_incompatible(struct file *file, struct page *page) |
709 | { | |
cd3758e3 | 710 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 711 | struct nfs_page *req; |
1a54533e | 712 | int do_flush, status; |
1da177e4 LT |
713 | /* |
714 | * Look for a request corresponding to this page. If there | |
715 | * is one, and it belongs to another file, we flush it out | |
716 | * before we try to copy anything into the page. Do this | |
717 | * due to the lack of an ACCESS-type call in NFSv2. | |
718 | * Also do the same if we find a request from an existing | |
719 | * dropped page. | |
720 | */ | |
1a54533e TM |
721 | do { |
722 | req = nfs_page_find_request(page); | |
723 | if (req == NULL) | |
724 | return 0; | |
e468bae9 | 725 | do_flush = req->wb_page != page || req->wb_context != ctx; |
1da177e4 | 726 | nfs_release_request(req); |
1a54533e TM |
727 | if (!do_flush) |
728 | return 0; | |
729 | status = nfs_wb_page(page->mapping->host, page); | |
730 | } while (status == 0); | |
731 | return status; | |
1da177e4 LT |
732 | } |
733 | ||
5d47a356 TM |
734 | /* |
735 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
736 | * the PageUptodate() flag. In this case, we will need to turn off | |
737 | * write optimisations that depend on the page contents being correct. | |
738 | */ | |
739 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) | |
740 | { | |
741 | return PageUptodate(page) && | |
742 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); | |
743 | } | |
744 | ||
1da177e4 LT |
745 | /* |
746 | * Update and possibly write a cached page of an NFS file. | |
747 | * | |
748 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
749 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
750 | */ | |
751 | int nfs_updatepage(struct file *file, struct page *page, | |
752 | unsigned int offset, unsigned int count) | |
753 | { | |
cd3758e3 | 754 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 755 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
756 | int status = 0; |
757 | ||
91d5b470 CL |
758 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
759 | ||
48186c7d | 760 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
01cce933 JJS |
761 | file->f_path.dentry->d_parent->d_name.name, |
762 | file->f_path.dentry->d_name.name, count, | |
48186c7d | 763 | (long long)(page_offset(page) + offset)); |
1da177e4 | 764 | |
1da177e4 | 765 | /* If we're not using byte range locks, and we know the page |
5d47a356 TM |
766 | * is up to date, it may be more efficient to extend the write |
767 | * to cover the entire page in order to avoid fragmentation | |
768 | * inefficiencies. | |
1da177e4 | 769 | */ |
5d47a356 TM |
770 | if (nfs_write_pageuptodate(page, inode) && |
771 | inode->i_flock == NULL && | |
6b2f3d1f | 772 | !(file->f_flags & O_DSYNC)) { |
49a70f27 | 773 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 774 | offset = 0; |
1da177e4 LT |
775 | } |
776 | ||
e21195a7 | 777 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
778 | if (status < 0) |
779 | nfs_set_pageerror(page); | |
780 | else | |
781 | __set_page_dirty_nobuffers(page); | |
1da177e4 | 782 | |
48186c7d | 783 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
1da177e4 | 784 | status, (long long)i_size_read(inode)); |
1da177e4 LT |
785 | return status; |
786 | } | |
787 | ||
788 | static void nfs_writepage_release(struct nfs_page *req) | |
789 | { | |
1da177e4 | 790 | |
7e5f6146 | 791 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) { |
8e821cad TM |
792 | nfs_end_page_writeback(req->wb_page); |
793 | nfs_inode_remove_request(req); | |
794 | } else | |
795 | nfs_end_page_writeback(req->wb_page); | |
9fd367f0 | 796 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
797 | } |
798 | ||
3ff7576d | 799 | static int flush_task_priority(int how) |
1da177e4 LT |
800 | { |
801 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
802 | case FLUSH_HIGHPRI: | |
803 | return RPC_PRIORITY_HIGH; | |
804 | case FLUSH_LOWPRI: | |
805 | return RPC_PRIORITY_LOW; | |
806 | } | |
807 | return RPC_PRIORITY_NORMAL; | |
808 | } | |
809 | ||
810 | /* | |
811 | * Set up the argument/result storage required for the RPC call. | |
812 | */ | |
dbae4c73 | 813 | static int nfs_write_rpcsetup(struct nfs_page *req, |
1da177e4 | 814 | struct nfs_write_data *data, |
788e7a89 | 815 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
816 | unsigned int count, unsigned int offset, |
817 | int how) | |
818 | { | |
84115e1c TM |
819 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
820 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
3ff7576d | 821 | int priority = flush_task_priority(how); |
07737691 | 822 | struct rpc_task *task; |
bdc7f021 TM |
823 | struct rpc_message msg = { |
824 | .rpc_argp = &data->args, | |
825 | .rpc_resp = &data->res, | |
826 | .rpc_cred = req->wb_context->cred, | |
827 | }; | |
84115e1c TM |
828 | struct rpc_task_setup task_setup_data = { |
829 | .rpc_client = NFS_CLIENT(inode), | |
07737691 | 830 | .task = &data->task, |
bdc7f021 | 831 | .rpc_message = &msg, |
84115e1c TM |
832 | .callback_ops = call_ops, |
833 | .callback_data = data, | |
101070ca | 834 | .workqueue = nfsiod_workqueue, |
84115e1c | 835 | .flags = flags, |
3ff7576d | 836 | .priority = priority, |
84115e1c | 837 | }; |
1da177e4 LT |
838 | |
839 | /* Set up the RPC argument and reply structs | |
840 | * NB: take care not to mess about with data->commit et al. */ | |
841 | ||
842 | data->req = req; | |
88be9f99 | 843 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
bdc7f021 | 844 | data->cred = msg.rpc_cred; |
1da177e4 LT |
845 | |
846 | data->args.fh = NFS_FH(inode); | |
847 | data->args.offset = req_offset(req) + offset; | |
848 | data->args.pgbase = req->wb_pgbase + offset; | |
849 | data->args.pages = data->pagevec; | |
850 | data->args.count = count; | |
383ba719 | 851 | data->args.context = get_nfs_open_context(req->wb_context); |
bdc7f021 TM |
852 | data->args.stable = NFS_UNSTABLE; |
853 | if (how & FLUSH_STABLE) { | |
854 | data->args.stable = NFS_DATA_SYNC; | |
fb8a1f11 | 855 | if (!nfs_need_commit(NFS_I(inode))) |
bdc7f021 TM |
856 | data->args.stable = NFS_FILE_SYNC; |
857 | } | |
1da177e4 LT |
858 | |
859 | data->res.fattr = &data->fattr; | |
860 | data->res.count = count; | |
861 | data->res.verf = &data->verf; | |
0e574af1 | 862 | nfs_fattr_init(&data->fattr); |
1da177e4 | 863 | |
788e7a89 | 864 | /* Set up the initial task struct. */ |
bdc7f021 | 865 | NFS_PROTO(inode)->write_setup(data, &msg); |
1da177e4 | 866 | |
a3f565b1 | 867 | dprintk("NFS: %5u initiated write call " |
48186c7d | 868 | "(req %s/%lld, %u bytes @ offset %llu)\n", |
0bbacc40 | 869 | data->task.tk_pid, |
1da177e4 LT |
870 | inode->i_sb->s_id, |
871 | (long long)NFS_FILEID(inode), | |
872 | count, | |
873 | (unsigned long long)data->args.offset); | |
1da177e4 | 874 | |
07737691 | 875 | task = rpc_run_task(&task_setup_data); |
dbae4c73 TM |
876 | if (IS_ERR(task)) |
877 | return PTR_ERR(task); | |
878 | rpc_put_task(task); | |
879 | return 0; | |
1da177e4 LT |
880 | } |
881 | ||
6d884e8f F |
882 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
883 | * call this on each, which will prepare them to be retried on next | |
884 | * writeback using standard nfs. | |
885 | */ | |
886 | static void nfs_redirty_request(struct nfs_page *req) | |
887 | { | |
888 | nfs_mark_request_dirty(req); | |
889 | nfs_end_page_writeback(req->wb_page); | |
890 | nfs_clear_page_tag_locked(req); | |
891 | } | |
892 | ||
1da177e4 LT |
893 | /* |
894 | * Generate multiple small requests to write out a single | |
895 | * contiguous dirty area on one page. | |
896 | */ | |
8d5658c9 | 897 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
898 | { |
899 | struct nfs_page *req = nfs_list_entry(head->next); | |
900 | struct page *page = req->wb_page; | |
901 | struct nfs_write_data *data; | |
e9f7bee1 TM |
902 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
903 | unsigned int offset; | |
1da177e4 | 904 | int requests = 0; |
dbae4c73 | 905 | int ret = 0; |
1da177e4 LT |
906 | LIST_HEAD(list); |
907 | ||
908 | nfs_list_remove_request(req); | |
909 | ||
bcb71bba | 910 | nbytes = count; |
e9f7bee1 TM |
911 | do { |
912 | size_t len = min(nbytes, wsize); | |
913 | ||
8d5658c9 | 914 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
915 | if (!data) |
916 | goto out_bad; | |
917 | list_add(&data->pages, &list); | |
918 | requests++; | |
e9f7bee1 TM |
919 | nbytes -= len; |
920 | } while (nbytes != 0); | |
1da177e4 LT |
921 | atomic_set(&req->wb_complete, requests); |
922 | ||
923 | ClearPageError(page); | |
1da177e4 | 924 | offset = 0; |
bcb71bba | 925 | nbytes = count; |
1da177e4 | 926 | do { |
dbae4c73 TM |
927 | int ret2; |
928 | ||
1da177e4 LT |
929 | data = list_entry(list.next, struct nfs_write_data, pages); |
930 | list_del_init(&data->pages); | |
931 | ||
932 | data->pagevec[0] = page; | |
1da177e4 | 933 | |
bcb71bba TM |
934 | if (nbytes < wsize) |
935 | wsize = nbytes; | |
dbae4c73 | 936 | ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
bcb71bba | 937 | wsize, offset, how); |
dbae4c73 TM |
938 | if (ret == 0) |
939 | ret = ret2; | |
bcb71bba TM |
940 | offset += wsize; |
941 | nbytes -= wsize; | |
1da177e4 LT |
942 | } while (nbytes != 0); |
943 | ||
dbae4c73 | 944 | return ret; |
1da177e4 LT |
945 | |
946 | out_bad: | |
947 | while (!list_empty(&list)) { | |
948 | data = list_entry(list.next, struct nfs_write_data, pages); | |
949 | list_del(&data->pages); | |
8aca67f0 | 950 | nfs_writedata_release(data); |
1da177e4 | 951 | } |
61822ab5 | 952 | nfs_redirty_request(req); |
1da177e4 LT |
953 | return -ENOMEM; |
954 | } | |
955 | ||
956 | /* | |
957 | * Create an RPC task for the given write request and kick it. | |
958 | * The page must have been locked by the caller. | |
959 | * | |
960 | * It may happen that the page we're passed is not marked dirty. | |
961 | * This is the case if nfs_updatepage detects a conflicting request | |
962 | * that has been written but not committed. | |
963 | */ | |
8d5658c9 | 964 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
965 | { |
966 | struct nfs_page *req; | |
967 | struct page **pages; | |
968 | struct nfs_write_data *data; | |
1da177e4 | 969 | |
8d5658c9 | 970 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
971 | if (!data) |
972 | goto out_bad; | |
973 | ||
974 | pages = data->pagevec; | |
1da177e4 LT |
975 | while (!list_empty(head)) { |
976 | req = nfs_list_entry(head->next); | |
977 | nfs_list_remove_request(req); | |
978 | nfs_list_add_request(req, &data->pages); | |
979 | ClearPageError(req->wb_page); | |
1da177e4 | 980 | *pages++ = req->wb_page; |
1da177e4 LT |
981 | } |
982 | req = nfs_list_entry(data->pages.next); | |
983 | ||
1da177e4 | 984 | /* Set up the argument struct */ |
dbae4c73 | 985 | return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
986 | out_bad: |
987 | while (!list_empty(head)) { | |
10afec90 | 988 | req = nfs_list_entry(head->next); |
1da177e4 | 989 | nfs_list_remove_request(req); |
61822ab5 | 990 | nfs_redirty_request(req); |
1da177e4 LT |
991 | } |
992 | return -ENOMEM; | |
993 | } | |
994 | ||
c63c7b05 TM |
995 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
996 | struct inode *inode, int ioflags) | |
1da177e4 | 997 | { |
bf4285e7 | 998 | size_t wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 999 | |
bcb71bba | 1000 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 1001 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 1002 | else |
c63c7b05 | 1003 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | /* | |
1007 | * Handle a write reply that flushed part of a page. | |
1008 | */ | |
788e7a89 | 1009 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1010 | { |
788e7a89 | 1011 | struct nfs_write_data *data = calldata; |
1da177e4 | 1012 | |
48186c7d CL |
1013 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
1014 | task->tk_pid, | |
1015 | data->req->wb_context->path.dentry->d_inode->i_sb->s_id, | |
1016 | (long long) | |
1017 | NFS_FILEID(data->req->wb_context->path.dentry->d_inode), | |
1018 | data->req->wb_bytes, (long long)req_offset(data->req)); | |
1da177e4 | 1019 | |
c9d8f89d TM |
1020 | nfs_writeback_done(task, data); |
1021 | } | |
788e7a89 | 1022 | |
c9d8f89d TM |
1023 | static void nfs_writeback_release_partial(void *calldata) |
1024 | { | |
1025 | struct nfs_write_data *data = calldata; | |
1026 | struct nfs_page *req = data->req; | |
1027 | struct page *page = req->wb_page; | |
1028 | int status = data->task.tk_status; | |
1029 | ||
1030 | if (status < 0) { | |
a301b777 | 1031 | nfs_set_pageerror(page); |
c9d8f89d TM |
1032 | nfs_context_set_write_error(req->wb_context, status); |
1033 | dprintk(", error = %d\n", status); | |
8e821cad | 1034 | goto out; |
1da177e4 LT |
1035 | } |
1036 | ||
8e821cad | 1037 | if (nfs_write_need_commit(data)) { |
587142f8 | 1038 | struct inode *inode = page->mapping->host; |
8e821cad | 1039 | |
587142f8 | 1040 | spin_lock(&inode->i_lock); |
8e821cad TM |
1041 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
1042 | /* Do nothing we need to resend the writes */ | |
1043 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1044 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1045 | dprintk(" defer commit\n"); | |
1046 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1047 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1048 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1049 | dprintk(" server reboot detected\n"); | |
1050 | } | |
587142f8 | 1051 | spin_unlock(&inode->i_lock); |
8e821cad TM |
1052 | } else |
1053 | dprintk(" OK\n"); | |
1054 | ||
1055 | out: | |
1da177e4 LT |
1056 | if (atomic_dec_and_test(&req->wb_complete)) |
1057 | nfs_writepage_release(req); | |
c9d8f89d | 1058 | nfs_writedata_release(calldata); |
1da177e4 LT |
1059 | } |
1060 | ||
def6ed7e AA |
1061 | #if defined(CONFIG_NFS_V4_1) |
1062 | void nfs_write_prepare(struct rpc_task *task, void *calldata) | |
1063 | { | |
1064 | struct nfs_write_data *data = calldata; | |
1065 | struct nfs_client *clp = (NFS_SERVER(data->inode))->nfs_client; | |
1066 | ||
1067 | if (nfs4_setup_sequence(clp, &data->args.seq_args, | |
1068 | &data->res.seq_res, 1, task)) | |
1069 | return; | |
1070 | rpc_call_start(task); | |
1071 | } | |
1072 | #endif /* CONFIG_NFS_V4_1 */ | |
1073 | ||
788e7a89 | 1074 | static const struct rpc_call_ops nfs_write_partial_ops = { |
def6ed7e AA |
1075 | #if defined(CONFIG_NFS_V4_1) |
1076 | .rpc_call_prepare = nfs_write_prepare, | |
1077 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1078 | .rpc_call_done = nfs_writeback_done_partial, |
c9d8f89d | 1079 | .rpc_release = nfs_writeback_release_partial, |
788e7a89 TM |
1080 | }; |
1081 | ||
1da177e4 LT |
1082 | /* |
1083 | * Handle a write reply that flushes a whole page. | |
1084 | * | |
1085 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1086 | * writebacks since the page->count is kept > 1 for as long | |
1087 | * as the page has a write request pending. | |
1088 | */ | |
788e7a89 | 1089 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1090 | { |
788e7a89 | 1091 | struct nfs_write_data *data = calldata; |
1da177e4 | 1092 | |
c9d8f89d TM |
1093 | nfs_writeback_done(task, data); |
1094 | } | |
1095 | ||
1096 | static void nfs_writeback_release_full(void *calldata) | |
1097 | { | |
1098 | struct nfs_write_data *data = calldata; | |
1099 | int status = data->task.tk_status; | |
788e7a89 | 1100 | |
1da177e4 LT |
1101 | /* Update attributes as result of writeback. */ |
1102 | while (!list_empty(&data->pages)) { | |
c9d8f89d TM |
1103 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
1104 | struct page *page = req->wb_page; | |
1105 | ||
1da177e4 | 1106 | nfs_list_remove_request(req); |
1da177e4 | 1107 | |
48186c7d CL |
1108 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
1109 | data->task.tk_pid, | |
88be9f99 TM |
1110 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1111 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1112 | req->wb_bytes, |
1113 | (long long)req_offset(req)); | |
1114 | ||
c9d8f89d | 1115 | if (status < 0) { |
a301b777 | 1116 | nfs_set_pageerror(page); |
c9d8f89d TM |
1117 | nfs_context_set_write_error(req->wb_context, status); |
1118 | dprintk(", error = %d\n", status); | |
8e821cad | 1119 | goto remove_request; |
1da177e4 | 1120 | } |
1da177e4 | 1121 | |
8e821cad TM |
1122 | if (nfs_write_need_commit(data)) { |
1123 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1124 | nfs_mark_request_commit(req); | |
1125 | nfs_end_page_writeback(page); | |
1126 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1127 | goto next; |
1128 | } | |
8e821cad TM |
1129 | dprintk(" OK\n"); |
1130 | remove_request: | |
1131 | nfs_end_page_writeback(page); | |
1da177e4 | 1132 | nfs_inode_remove_request(req); |
1da177e4 | 1133 | next: |
9fd367f0 | 1134 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1135 | } |
c9d8f89d | 1136 | nfs_writedata_release(calldata); |
1da177e4 LT |
1137 | } |
1138 | ||
788e7a89 | 1139 | static const struct rpc_call_ops nfs_write_full_ops = { |
def6ed7e AA |
1140 | #if defined(CONFIG_NFS_V4_1) |
1141 | .rpc_call_prepare = nfs_write_prepare, | |
1142 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1143 | .rpc_call_done = nfs_writeback_done_full, |
c9d8f89d | 1144 | .rpc_release = nfs_writeback_release_full, |
788e7a89 TM |
1145 | }; |
1146 | ||
1147 | ||
1da177e4 LT |
1148 | /* |
1149 | * This function is called when the WRITE call is complete. | |
1150 | */ | |
462d5b32 | 1151 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1152 | { |
1da177e4 LT |
1153 | struct nfs_writeargs *argp = &data->args; |
1154 | struct nfs_writeres *resp = &data->res; | |
eedc020e | 1155 | struct nfs_server *server = NFS_SERVER(data->inode); |
788e7a89 | 1156 | int status; |
1da177e4 | 1157 | |
a3f565b1 | 1158 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1159 | task->tk_pid, task->tk_status); |
1160 | ||
f551e44f CL |
1161 | /* |
1162 | * ->write_done will attempt to use post-op attributes to detect | |
1163 | * conflicting writes by other clients. A strict interpretation | |
1164 | * of close-to-open would allow us to continue caching even if | |
1165 | * another writer had changed the file, but some applications | |
1166 | * depend on tighter cache coherency when writing. | |
1167 | */ | |
788e7a89 TM |
1168 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1169 | if (status != 0) | |
1170 | return status; | |
91d5b470 CL |
1171 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1172 | ||
1da177e4 LT |
1173 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1174 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1175 | /* We tried a write call, but the server did not | |
1176 | * commit data to stable storage even though we | |
1177 | * requested it. | |
1178 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1179 | * the server reports NFS_DATA_SYNC, but performs | |
1180 | * NFS_FILE_SYNC. We therefore implement this checking | |
1181 | * as a dprintk() in order to avoid filling syslog. | |
1182 | */ | |
1183 | static unsigned long complain; | |
1184 | ||
1185 | if (time_before(complain, jiffies)) { | |
48186c7d | 1186 | dprintk("NFS: faulty NFS server %s:" |
1da177e4 | 1187 | " (committed = %d) != (stable = %d)\n", |
eedc020e | 1188 | server->nfs_client->cl_hostname, |
1da177e4 LT |
1189 | resp->verf->committed, argp->stable); |
1190 | complain = jiffies + 300 * HZ; | |
1191 | } | |
1192 | } | |
1193 | #endif | |
1194 | /* Is this a short write? */ | |
1195 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1196 | static unsigned long complain; | |
1197 | ||
91d5b470 CL |
1198 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1199 | ||
1da177e4 LT |
1200 | /* Has the server at least made some progress? */ |
1201 | if (resp->count != 0) { | |
1202 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1203 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1204 | /* Resend from where the server left off */ | |
1205 | argp->offset += resp->count; | |
1206 | argp->pgbase += resp->count; | |
1207 | argp->count -= resp->count; | |
1208 | } else { | |
1209 | /* Resend as a stable write in order to avoid | |
1210 | * headaches in the case of a server crash. | |
1211 | */ | |
1212 | argp->stable = NFS_FILE_SYNC; | |
1213 | } | |
0110ee15 | 1214 | nfs_restart_rpc(task, server->nfs_client); |
788e7a89 | 1215 | return -EAGAIN; |
1da177e4 LT |
1216 | } |
1217 | if (time_before(complain, jiffies)) { | |
1218 | printk(KERN_WARNING | |
1219 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1220 | argp->count); | |
1221 | complain = jiffies + 300 * HZ; | |
1222 | } | |
1223 | /* Can't do anything about it except throw an error. */ | |
1224 | task->tk_status = -EIO; | |
1225 | } | |
788e7a89 | 1226 | return 0; |
1da177e4 LT |
1227 | } |
1228 | ||
1229 | ||
1230 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
0aa05887 | 1231 | static void nfs_commitdata_release(void *data) |
1da177e4 | 1232 | { |
383ba719 TM |
1233 | struct nfs_write_data *wdata = data; |
1234 | ||
1235 | put_nfs_open_context(wdata->args.context); | |
1da177e4 LT |
1236 | nfs_commit_free(wdata); |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * Set up the argument/result storage required for the RPC call. | |
1241 | */ | |
dbae4c73 | 1242 | static int nfs_commit_rpcsetup(struct list_head *head, |
788e7a89 TM |
1243 | struct nfs_write_data *data, |
1244 | int how) | |
1da177e4 | 1245 | { |
84115e1c TM |
1246 | struct nfs_page *first = nfs_list_entry(head->next); |
1247 | struct inode *inode = first->wb_context->path.dentry->d_inode; | |
1248 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
3ff7576d | 1249 | int priority = flush_task_priority(how); |
07737691 | 1250 | struct rpc_task *task; |
bdc7f021 TM |
1251 | struct rpc_message msg = { |
1252 | .rpc_argp = &data->args, | |
1253 | .rpc_resp = &data->res, | |
1254 | .rpc_cred = first->wb_context->cred, | |
1255 | }; | |
84115e1c | 1256 | struct rpc_task_setup task_setup_data = { |
07737691 | 1257 | .task = &data->task, |
84115e1c | 1258 | .rpc_client = NFS_CLIENT(inode), |
bdc7f021 | 1259 | .rpc_message = &msg, |
84115e1c TM |
1260 | .callback_ops = &nfs_commit_ops, |
1261 | .callback_data = data, | |
101070ca | 1262 | .workqueue = nfsiod_workqueue, |
84115e1c | 1263 | .flags = flags, |
3ff7576d | 1264 | .priority = priority, |
84115e1c | 1265 | }; |
1da177e4 LT |
1266 | |
1267 | /* Set up the RPC argument and reply structs | |
1268 | * NB: take care not to mess about with data->commit et al. */ | |
1269 | ||
1270 | list_splice_init(head, &data->pages); | |
1da177e4 | 1271 | |
1da177e4 | 1272 | data->inode = inode; |
bdc7f021 | 1273 | data->cred = msg.rpc_cred; |
1da177e4 LT |
1274 | |
1275 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1276 | /* Note: we always request a commit of the entire inode */ |
1277 | data->args.offset = 0; | |
1278 | data->args.count = 0; | |
383ba719 | 1279 | data->args.context = get_nfs_open_context(first->wb_context); |
3da28eb1 | 1280 | data->res.count = 0; |
1da177e4 LT |
1281 | data->res.fattr = &data->fattr; |
1282 | data->res.verf = &data->verf; | |
0e574af1 | 1283 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1284 | |
1285 | /* Set up the initial task struct. */ | |
bdc7f021 | 1286 | NFS_PROTO(inode)->commit_setup(data, &msg); |
1da177e4 | 1287 | |
a3f565b1 | 1288 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
bdc7f021 | 1289 | |
07737691 | 1290 | task = rpc_run_task(&task_setup_data); |
dbae4c73 TM |
1291 | if (IS_ERR(task)) |
1292 | return PTR_ERR(task); | |
1293 | rpc_put_task(task); | |
1294 | return 0; | |
1da177e4 LT |
1295 | } |
1296 | ||
1297 | /* | |
1298 | * Commit dirty pages | |
1299 | */ | |
1300 | static int | |
40859d7e | 1301 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1302 | { |
1303 | struct nfs_write_data *data; | |
1304 | struct nfs_page *req; | |
1305 | ||
c9d8f89d | 1306 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1307 | |
1308 | if (!data) | |
1309 | goto out_bad; | |
1310 | ||
1311 | /* Set up the argument struct */ | |
dbae4c73 | 1312 | return nfs_commit_rpcsetup(head, data, how); |
1da177e4 LT |
1313 | out_bad: |
1314 | while (!list_empty(head)) { | |
1315 | req = nfs_list_entry(head->next); | |
1316 | nfs_list_remove_request(req); | |
1317 | nfs_mark_request_commit(req); | |
83715ad5 | 1318 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1319 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1320 | BDI_RECLAIMABLE); | |
9fd367f0 | 1321 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1322 | } |
1323 | return -ENOMEM; | |
1324 | } | |
1325 | ||
1326 | /* | |
1327 | * COMMIT call returned | |
1328 | */ | |
788e7a89 | 1329 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1330 | { |
963d8fe5 | 1331 | struct nfs_write_data *data = calldata; |
1da177e4 | 1332 | |
a3f565b1 | 1333 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1334 | task->tk_pid, task->tk_status); |
1335 | ||
788e7a89 TM |
1336 | /* Call the NFS version-specific code */ |
1337 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1338 | return; | |
c9d8f89d TM |
1339 | } |
1340 | ||
1341 | static void nfs_commit_release(void *calldata) | |
1342 | { | |
1343 | struct nfs_write_data *data = calldata; | |
1344 | struct nfs_page *req; | |
1345 | int status = data->task.tk_status; | |
788e7a89 | 1346 | |
1da177e4 LT |
1347 | while (!list_empty(&data->pages)) { |
1348 | req = nfs_list_entry(data->pages.next); | |
1349 | nfs_list_remove_request(req); | |
e468bae9 | 1350 | nfs_clear_request_commit(req); |
1da177e4 | 1351 | |
48186c7d | 1352 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
88be9f99 TM |
1353 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1354 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1355 | req->wb_bytes, |
1356 | (long long)req_offset(req)); | |
c9d8f89d TM |
1357 | if (status < 0) { |
1358 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1359 | nfs_inode_remove_request(req); |
c9d8f89d | 1360 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1361 | goto next; |
1362 | } | |
1363 | ||
1364 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1365 | * returned by the server against all stored verfs. */ | |
1366 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1367 | /* We have a match */ | |
1368 | nfs_inode_remove_request(req); | |
1369 | dprintk(" OK\n"); | |
1370 | goto next; | |
1371 | } | |
1372 | /* We have a mismatch. Write the page again */ | |
1373 | dprintk(" mismatch\n"); | |
6d884e8f | 1374 | nfs_mark_request_dirty(req); |
1da177e4 | 1375 | next: |
9fd367f0 | 1376 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1377 | } |
c9d8f89d | 1378 | nfs_commitdata_release(calldata); |
1da177e4 | 1379 | } |
788e7a89 TM |
1380 | |
1381 | static const struct rpc_call_ops nfs_commit_ops = { | |
21d9a851 AA |
1382 | #if defined(CONFIG_NFS_V4_1) |
1383 | .rpc_call_prepare = nfs_write_prepare, | |
1384 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 TM |
1385 | .rpc_call_done = nfs_commit_done, |
1386 | .rpc_release = nfs_commit_release, | |
1387 | }; | |
1da177e4 | 1388 | |
8fc795f7 | 1389 | static int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1390 | { |
1da177e4 | 1391 | LIST_HEAD(head); |
7d46a49f | 1392 | int res; |
1da177e4 | 1393 | |
587142f8 | 1394 | spin_lock(&inode->i_lock); |
3da28eb1 | 1395 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1396 | spin_unlock(&inode->i_lock); |
1da177e4 | 1397 | if (res) { |
7d46a49f | 1398 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1399 | if (error < 0) |
1400 | return error; | |
1401 | } | |
1da177e4 LT |
1402 | return res; |
1403 | } | |
8fc795f7 TM |
1404 | |
1405 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) | |
1406 | { | |
420e3646 TM |
1407 | struct nfs_inode *nfsi = NFS_I(inode); |
1408 | int flags = FLUSH_SYNC; | |
1409 | int ret = 0; | |
8fc795f7 | 1410 | |
420e3646 TM |
1411 | /* Don't commit yet if this is a non-blocking flush and there are |
1412 | * lots of outstanding writes for this mapping. | |
1413 | */ | |
1414 | if (wbc->sync_mode == WB_SYNC_NONE && | |
1415 | nfsi->ncommit <= (nfsi->npages >> 1)) | |
1416 | goto out_mark_dirty; | |
1417 | ||
5bad5abe | 1418 | if (wbc->nonblocking || wbc->for_background) |
420e3646 TM |
1419 | flags = 0; |
1420 | ret = nfs_commit_inode(inode, flags); | |
1421 | if (ret >= 0) { | |
1422 | if (wbc->sync_mode == WB_SYNC_NONE) { | |
1423 | if (ret < wbc->nr_to_write) | |
1424 | wbc->nr_to_write -= ret; | |
1425 | else | |
1426 | wbc->nr_to_write = 0; | |
1427 | } | |
8fc795f7 | 1428 | return 0; |
420e3646 TM |
1429 | } |
1430 | out_mark_dirty: | |
8fc795f7 TM |
1431 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1432 | return ret; | |
1433 | } | |
c63c7b05 TM |
1434 | #else |
1435 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1436 | { | |
1437 | return 0; | |
1438 | } | |
8fc795f7 TM |
1439 | |
1440 | static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc) | |
1441 | { | |
1442 | return 0; | |
1443 | } | |
1da177e4 LT |
1444 | #endif |
1445 | ||
8fc795f7 TM |
1446 | int nfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1447 | { | |
1448 | return nfs_commit_unstable_pages(inode, wbc); | |
1449 | } | |
1450 | ||
1c75950b | 1451 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1452 | { |
1c75950b | 1453 | struct inode *inode = mapping->host; |
ca52fec1 | 1454 | pgoff_t idx_start, idx_end; |
1c75950b | 1455 | unsigned int npages = 0; |
c42de9dd | 1456 | LIST_HEAD(head); |
70b9ecbd | 1457 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1458 | long pages, ret; |
1da177e4 | 1459 | |
1c75950b TM |
1460 | /* FIXME */ |
1461 | if (wbc->range_cyclic) | |
1462 | idx_start = 0; | |
1463 | else { | |
1464 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1465 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1466 | if (idx_end > idx_start) { | |
ca52fec1 | 1467 | pgoff_t l_npages = 1 + idx_end - idx_start; |
1c75950b TM |
1468 | npages = l_npages; |
1469 | if (sizeof(npages) != sizeof(l_npages) && | |
ca52fec1 | 1470 | (pgoff_t)npages != l_npages) |
1c75950b TM |
1471 | npages = 0; |
1472 | } | |
1473 | } | |
c42de9dd | 1474 | how &= ~FLUSH_NOCOMMIT; |
587142f8 | 1475 | spin_lock(&inode->i_lock); |
1da177e4 | 1476 | do { |
c42de9dd TM |
1477 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1478 | if (ret != 0) | |
70b9ecbd | 1479 | continue; |
c42de9dd TM |
1480 | if (nocommit) |
1481 | break; | |
d2ccddf0 | 1482 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
724c439c | 1483 | if (pages == 0) |
c42de9dd | 1484 | break; |
d2ccddf0 | 1485 | pages += nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1486 | spin_unlock(&inode->i_lock); |
c42de9dd | 1487 | ret = nfs_commit_list(inode, &head, how); |
587142f8 TM |
1488 | spin_lock(&inode->i_lock); |
1489 | ||
c42de9dd | 1490 | } while (ret >= 0); |
587142f8 | 1491 | spin_unlock(&inode->i_lock); |
c42de9dd | 1492 | return ret; |
1da177e4 LT |
1493 | } |
1494 | ||
34901f70 | 1495 | static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1c75950b | 1496 | { |
1c75950b TM |
1497 | int ret; |
1498 | ||
34901f70 | 1499 | ret = nfs_writepages(mapping, wbc); |
61822ab5 TM |
1500 | if (ret < 0) |
1501 | goto out; | |
34901f70 | 1502 | ret = nfs_sync_mapping_wait(mapping, wbc, how); |
ed90ef51 TM |
1503 | if (ret < 0) |
1504 | goto out; | |
1505 | return 0; | |
61822ab5 | 1506 | out: |
e507d9eb | 1507 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1508 | return ret; |
1509 | } | |
1510 | ||
34901f70 TM |
1511 | /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ |
1512 | static int nfs_write_mapping(struct address_space *mapping, int how) | |
1513 | { | |
1514 | struct writeback_control wbc = { | |
1515 | .bdi = mapping->backing_dev_info, | |
72cb77f4 | 1516 | .sync_mode = WB_SYNC_ALL, |
34901f70 | 1517 | .nr_to_write = LONG_MAX, |
d7fb1207 TM |
1518 | .range_start = 0, |
1519 | .range_end = LLONG_MAX, | |
34901f70 | 1520 | }; |
34901f70 | 1521 | |
34901f70 TM |
1522 | return __nfs_write_mapping(mapping, &wbc, how); |
1523 | } | |
1524 | ||
ed90ef51 TM |
1525 | /* |
1526 | * flush the inode to disk. | |
1527 | */ | |
1528 | int nfs_wb_all(struct inode *inode) | |
1c75950b | 1529 | { |
ed90ef51 TM |
1530 | return nfs_write_mapping(inode->i_mapping, 0); |
1531 | } | |
1c75950b | 1532 | |
ed90ef51 TM |
1533 | int nfs_wb_nocommit(struct inode *inode) |
1534 | { | |
1535 | return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); | |
1c75950b TM |
1536 | } |
1537 | ||
1b3b4a1a TM |
1538 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1539 | { | |
1540 | struct nfs_page *req; | |
1b3b4a1a TM |
1541 | int ret = 0; |
1542 | ||
1543 | BUG_ON(!PageLocked(page)); | |
1544 | for (;;) { | |
1545 | req = nfs_page_find_request(page); | |
1546 | if (req == NULL) | |
1b3b4a1a | 1547 | break; |
1b3b4a1a TM |
1548 | if (nfs_lock_request_dontget(req)) { |
1549 | nfs_inode_remove_request(req); | |
1550 | /* | |
1551 | * In case nfs_inode_remove_request has marked the | |
1552 | * page as being dirty | |
1553 | */ | |
1554 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1555 | nfs_unlock_request(req); | |
1556 | break; | |
1557 | } | |
1558 | ret = nfs_wait_on_request(req); | |
c9edda71 | 1559 | nfs_release_request(req); |
1b3b4a1a | 1560 | if (ret < 0) |
c988950e | 1561 | break; |
1b3b4a1a | 1562 | } |
1b3b4a1a TM |
1563 | return ret; |
1564 | } | |
1565 | ||
5334eb13 AB |
1566 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, |
1567 | int how) | |
1c75950b TM |
1568 | { |
1569 | loff_t range_start = page_offset(page); | |
1570 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1571 | struct writeback_control wbc = { |
1572 | .bdi = page->mapping->backing_dev_info, | |
1573 | .sync_mode = WB_SYNC_ALL, | |
1574 | .nr_to_write = LONG_MAX, | |
1575 | .range_start = range_start, | |
1576 | .range_end = range_end, | |
1577 | }; | |
1578 | int ret; | |
1c75950b | 1579 | |
73e3302f TM |
1580 | do { |
1581 | if (clear_page_dirty_for_io(page)) { | |
1582 | ret = nfs_writepage_locked(page, &wbc); | |
1583 | if (ret < 0) | |
1584 | goto out_error; | |
1585 | } else if (!PagePrivate(page)) | |
1586 | break; | |
1587 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); | |
4d770ccf | 1588 | if (ret < 0) |
73e3302f TM |
1589 | goto out_error; |
1590 | } while (PagePrivate(page)); | |
1591 | return 0; | |
1592 | out_error: | |
e507d9eb | 1593 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1594 | return ret; |
1c75950b TM |
1595 | } |
1596 | ||
1597 | /* | |
1598 | * Write back all requests on one page - we do this before reading it. | |
1599 | */ | |
1600 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1601 | { | |
4d770ccf | 1602 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1603 | } |
1604 | ||
074cc1de TM |
1605 | #ifdef CONFIG_MIGRATION |
1606 | int nfs_migrate_page(struct address_space *mapping, struct page *newpage, | |
1607 | struct page *page) | |
1608 | { | |
1609 | struct nfs_page *req; | |
1610 | int ret; | |
1611 | ||
7549ad5f | 1612 | nfs_fscache_release_page(page, GFP_KERNEL); |
074cc1de TM |
1613 | |
1614 | req = nfs_find_and_lock_request(page); | |
1615 | ret = PTR_ERR(req); | |
1616 | if (IS_ERR(req)) | |
1617 | goto out; | |
1618 | ||
1619 | ret = migrate_page(mapping, newpage, page); | |
1620 | if (!req) | |
1621 | goto out; | |
1622 | if (ret) | |
1623 | goto out_unlock; | |
1624 | page_cache_get(newpage); | |
190f38e5 | 1625 | spin_lock(&mapping->host->i_lock); |
074cc1de TM |
1626 | req->wb_page = newpage; |
1627 | SetPagePrivate(newpage); | |
190f38e5 | 1628 | set_page_private(newpage, (unsigned long)req); |
074cc1de TM |
1629 | ClearPagePrivate(page); |
1630 | set_page_private(page, 0); | |
190f38e5 | 1631 | spin_unlock(&mapping->host->i_lock); |
074cc1de TM |
1632 | page_cache_release(page); |
1633 | out_unlock: | |
1634 | nfs_clear_page_tag_locked(req); | |
074cc1de TM |
1635 | out: |
1636 | return ret; | |
1637 | } | |
1638 | #endif | |
1639 | ||
f7b422b1 | 1640 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1641 | { |
1642 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1643 | sizeof(struct nfs_write_data), | |
1644 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1645 | NULL); |
1da177e4 LT |
1646 | if (nfs_wdata_cachep == NULL) |
1647 | return -ENOMEM; | |
1648 | ||
93d2341c MD |
1649 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1650 | nfs_wdata_cachep); | |
1da177e4 LT |
1651 | if (nfs_wdata_mempool == NULL) |
1652 | return -ENOMEM; | |
1653 | ||
93d2341c MD |
1654 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1655 | nfs_wdata_cachep); | |
1da177e4 LT |
1656 | if (nfs_commit_mempool == NULL) |
1657 | return -ENOMEM; | |
1658 | ||
89a09141 PZ |
1659 | /* |
1660 | * NFS congestion size, scale with available memory. | |
1661 | * | |
1662 | * 64MB: 8192k | |
1663 | * 128MB: 11585k | |
1664 | * 256MB: 16384k | |
1665 | * 512MB: 23170k | |
1666 | * 1GB: 32768k | |
1667 | * 2GB: 46340k | |
1668 | * 4GB: 65536k | |
1669 | * 8GB: 92681k | |
1670 | * 16GB: 131072k | |
1671 | * | |
1672 | * This allows larger machines to have larger/more transfers. | |
1673 | * Limit the default to 256M | |
1674 | */ | |
1675 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1676 | if (nfs_congestion_kb > 256*1024) | |
1677 | nfs_congestion_kb = 256*1024; | |
1678 | ||
1da177e4 LT |
1679 | return 0; |
1680 | } | |
1681 | ||
266bee88 | 1682 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1683 | { |
1684 | mempool_destroy(nfs_commit_mempool); | |
1685 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1686 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1687 | } |
1688 |