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> |
1da177e4 LT |
16 | |
17 | #include <linux/sunrpc/clnt.h> | |
18 | #include <linux/nfs_fs.h> | |
19 | #include <linux/nfs_mount.h> | |
20 | #include <linux/nfs_page.h> | |
3fcfab16 AM |
21 | #include <linux/backing-dev.h> |
22 | ||
1da177e4 | 23 | #include <asm/uaccess.h> |
1da177e4 LT |
24 | |
25 | #include "delegation.h" | |
49a70f27 | 26 | #include "internal.h" |
91d5b470 | 27 | #include "iostat.h" |
def6ed7e | 28 | #include "nfs4_fs.h" |
1da177e4 LT |
29 | |
30 | #define NFSDBG_FACILITY NFSDBG_PAGECACHE | |
31 | ||
32 | #define MIN_POOL_WRITE (32) | |
33 | #define MIN_POOL_COMMIT (4) | |
34 | ||
35 | /* | |
36 | * Local function declarations | |
37 | */ | |
c63c7b05 TM |
38 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc, |
39 | struct inode *inode, int ioflags); | |
f8512ad0 | 40 | static void nfs_redirty_request(struct nfs_page *req); |
788e7a89 TM |
41 | static const struct rpc_call_ops nfs_write_partial_ops; |
42 | static const struct rpc_call_ops nfs_write_full_ops; | |
43 | static const struct rpc_call_ops nfs_commit_ops; | |
1da177e4 | 44 | |
e18b890b | 45 | static struct kmem_cache *nfs_wdata_cachep; |
3feb2d49 | 46 | static mempool_t *nfs_wdata_mempool; |
1da177e4 LT |
47 | static mempool_t *nfs_commit_mempool; |
48 | ||
c9d8f89d | 49 | struct nfs_write_data *nfs_commitdata_alloc(void) |
1da177e4 | 50 | { |
e6b4f8da | 51 | struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS); |
40859d7e | 52 | |
1da177e4 LT |
53 | if (p) { |
54 | memset(p, 0, sizeof(*p)); | |
55 | INIT_LIST_HEAD(&p->pages); | |
5f7dbd5c | 56 | p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE; |
1da177e4 LT |
57 | } |
58 | return p; | |
59 | } | |
60 | ||
5e4424af | 61 | void nfs_commit_free(struct nfs_write_data *p) |
1da177e4 | 62 | { |
40859d7e CL |
63 | if (p && (p->pagevec != &p->page_array[0])) |
64 | kfree(p->pagevec); | |
1da177e4 LT |
65 | mempool_free(p, nfs_commit_mempool); |
66 | } | |
67 | ||
8d5658c9 | 68 | struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount) |
3feb2d49 | 69 | { |
e6b4f8da | 70 | struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS); |
3feb2d49 TM |
71 | |
72 | if (p) { | |
73 | memset(p, 0, sizeof(*p)); | |
74 | INIT_LIST_HEAD(&p->pages); | |
e9f7bee1 | 75 | p->npages = pagecount; |
5f7dbd5c | 76 | p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE; |
0d0b5cb3 CL |
77 | if (pagecount <= ARRAY_SIZE(p->page_array)) |
78 | p->pagevec = p->page_array; | |
3feb2d49 | 79 | else { |
0d0b5cb3 CL |
80 | p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS); |
81 | if (!p->pagevec) { | |
3feb2d49 TM |
82 | mempool_free(p, nfs_wdata_mempool); |
83 | p = NULL; | |
84 | } | |
85 | } | |
86 | } | |
87 | return p; | |
88 | } | |
89 | ||
5e4424af | 90 | static void nfs_writedata_free(struct nfs_write_data *p) |
3feb2d49 TM |
91 | { |
92 | if (p && (p->pagevec != &p->page_array[0])) | |
93 | kfree(p->pagevec); | |
94 | mempool_free(p, nfs_wdata_mempool); | |
95 | } | |
96 | ||
383ba719 | 97 | void nfs_writedata_release(void *data) |
1da177e4 | 98 | { |
383ba719 TM |
99 | struct nfs_write_data *wdata = data; |
100 | ||
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; |
1da177e4 LT |
181 | if (wbc->for_kupdate) |
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 | ||
e261f51f TM |
223 | /* |
224 | * Find an associated nfs write request, and prepare to flush it out | |
9cccef95 | 225 | * May return an error if the user signalled nfs_wait_on_request(). |
e261f51f | 226 | */ |
c63c7b05 TM |
227 | static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio, |
228 | struct page *page) | |
e261f51f | 229 | { |
587142f8 | 230 | struct inode *inode = page->mapping->host; |
e261f51f | 231 | struct nfs_page *req; |
e261f51f TM |
232 | int ret; |
233 | ||
587142f8 | 234 | spin_lock(&inode->i_lock); |
e261f51f TM |
235 | for(;;) { |
236 | req = nfs_page_find_request_locked(page); | |
237 | if (req == NULL) { | |
587142f8 | 238 | spin_unlock(&inode->i_lock); |
9cccef95 | 239 | return 0; |
e261f51f | 240 | } |
acee478a | 241 | if (nfs_set_page_tag_locked(req)) |
e261f51f TM |
242 | break; |
243 | /* Note: If we hold the page lock, as is the case in nfs_writepage, | |
acee478a | 244 | * then the call to nfs_set_page_tag_locked() will always |
e261f51f TM |
245 | * succeed provided that someone hasn't already marked the |
246 | * request as dirty (in which case we don't care). | |
247 | */ | |
587142f8 | 248 | spin_unlock(&inode->i_lock); |
e261f51f TM |
249 | ret = nfs_wait_on_request(req); |
250 | nfs_release_request(req); | |
251 | if (ret != 0) | |
252 | return ret; | |
587142f8 | 253 | spin_lock(&inode->i_lock); |
e261f51f | 254 | } |
e468bae9 | 255 | if (test_bit(PG_CLEAN, &req->wb_flags)) { |
587142f8 | 256 | spin_unlock(&inode->i_lock); |
e468bae9 | 257 | BUG(); |
612c9384 | 258 | } |
c63c7b05 | 259 | if (nfs_set_page_writeback(page) != 0) { |
587142f8 | 260 | spin_unlock(&inode->i_lock); |
c63c7b05 TM |
261 | BUG(); |
262 | } | |
587142f8 | 263 | spin_unlock(&inode->i_lock); |
f8512ad0 FI |
264 | if (!nfs_pageio_add_request(pgio, req)) { |
265 | nfs_redirty_request(req); | |
f8512ad0 FI |
266 | return pgio->pg_error; |
267 | } | |
9cccef95 | 268 | return 0; |
e261f51f TM |
269 | } |
270 | ||
f758c885 | 271 | static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio) |
1da177e4 | 272 | { |
1da177e4 | 273 | struct inode *inode = page->mapping->host; |
1da177e4 | 274 | |
91d5b470 CL |
275 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE); |
276 | nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1); | |
277 | ||
7fe7f848 | 278 | nfs_pageio_cond_complete(pgio, page->index); |
f758c885 TM |
279 | return nfs_page_async_flush(pgio, page); |
280 | } | |
7fe7f848 | 281 | |
f758c885 TM |
282 | /* |
283 | * Write an mmapped page to the server. | |
284 | */ | |
285 | static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
286 | { | |
287 | struct nfs_pageio_descriptor pgio; | |
288 | int err; | |
49a70f27 | 289 | |
f758c885 TM |
290 | nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc)); |
291 | err = nfs_do_writepage(page, wbc, &pgio); | |
292 | nfs_pageio_complete(&pgio); | |
293 | if (err < 0) | |
294 | return err; | |
295 | if (pgio.pg_error < 0) | |
296 | return pgio.pg_error; | |
297 | return 0; | |
4d770ccf TM |
298 | } |
299 | ||
300 | int nfs_writepage(struct page *page, struct writeback_control *wbc) | |
301 | { | |
f758c885 | 302 | int ret; |
4d770ccf | 303 | |
f758c885 | 304 | ret = nfs_writepage_locked(page, wbc); |
1da177e4 | 305 | unlock_page(page); |
f758c885 TM |
306 | return ret; |
307 | } | |
308 | ||
309 | static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data) | |
310 | { | |
311 | int ret; | |
312 | ||
313 | ret = nfs_do_writepage(page, wbc, data); | |
314 | unlock_page(page); | |
315 | return ret; | |
1da177e4 LT |
316 | } |
317 | ||
1da177e4 LT |
318 | int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc) |
319 | { | |
1da177e4 | 320 | struct inode *inode = mapping->host; |
72cb77f4 | 321 | unsigned long *bitlock = &NFS_I(inode)->flags; |
c63c7b05 | 322 | struct nfs_pageio_descriptor pgio; |
1da177e4 LT |
323 | int err; |
324 | ||
72cb77f4 TM |
325 | /* Stop dirtying of new pages while we sync */ |
326 | err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING, | |
327 | nfs_wait_bit_killable, TASK_KILLABLE); | |
328 | if (err) | |
329 | goto out_err; | |
330 | ||
91d5b470 CL |
331 | nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES); |
332 | ||
c63c7b05 | 333 | nfs_pageio_init_write(&pgio, inode, wb_priority(wbc)); |
f758c885 | 334 | err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio); |
c63c7b05 | 335 | nfs_pageio_complete(&pgio); |
72cb77f4 TM |
336 | |
337 | clear_bit_unlock(NFS_INO_FLUSHING, bitlock); | |
338 | smp_mb__after_clear_bit(); | |
339 | wake_up_bit(bitlock, NFS_INO_FLUSHING); | |
340 | ||
f758c885 | 341 | if (err < 0) |
72cb77f4 TM |
342 | goto out_err; |
343 | err = pgio.pg_error; | |
344 | if (err < 0) | |
345 | goto out_err; | |
c63c7b05 | 346 | return 0; |
72cb77f4 TM |
347 | out_err: |
348 | return err; | |
1da177e4 LT |
349 | } |
350 | ||
351 | /* | |
352 | * Insert a write request into an inode | |
353 | */ | |
e7d39069 | 354 | static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req) |
1da177e4 LT |
355 | { |
356 | struct nfs_inode *nfsi = NFS_I(inode); | |
357 | int error; | |
358 | ||
e7d39069 TM |
359 | error = radix_tree_preload(GFP_NOFS); |
360 | if (error != 0) | |
361 | goto out; | |
362 | ||
363 | /* Lock the request! */ | |
364 | nfs_lock_request_dontget(req); | |
365 | ||
366 | spin_lock(&inode->i_lock); | |
1da177e4 | 367 | error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req); |
27852596 | 368 | BUG_ON(error); |
1da177e4 LT |
369 | if (!nfsi->npages) { |
370 | igrab(inode); | |
1da177e4 LT |
371 | if (nfs_have_delegation(inode, FMODE_WRITE)) |
372 | nfsi->change_attr++; | |
373 | } | |
deb7d638 | 374 | SetPagePrivate(req->wb_page); |
277459d2 | 375 | set_page_private(req->wb_page, (unsigned long)req); |
1da177e4 | 376 | nfsi->npages++; |
c03b4024 | 377 | kref_get(&req->wb_kref); |
27852596 NP |
378 | radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index, |
379 | NFS_PAGE_TAG_LOCKED); | |
e7d39069 TM |
380 | spin_unlock(&inode->i_lock); |
381 | radix_tree_preload_end(); | |
382 | out: | |
383 | return error; | |
1da177e4 LT |
384 | } |
385 | ||
386 | /* | |
89a09141 | 387 | * Remove a write request from an inode |
1da177e4 LT |
388 | */ |
389 | static void nfs_inode_remove_request(struct nfs_page *req) | |
390 | { | |
88be9f99 | 391 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
392 | struct nfs_inode *nfsi = NFS_I(inode); |
393 | ||
394 | BUG_ON (!NFS_WBACK_BUSY(req)); | |
395 | ||
587142f8 | 396 | spin_lock(&inode->i_lock); |
277459d2 | 397 | set_page_private(req->wb_page, 0); |
deb7d638 | 398 | ClearPagePrivate(req->wb_page); |
1da177e4 LT |
399 | radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index); |
400 | nfsi->npages--; | |
401 | if (!nfsi->npages) { | |
587142f8 | 402 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
403 | iput(inode); |
404 | } else | |
587142f8 | 405 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
406 | nfs_clear_request(req); |
407 | nfs_release_request(req); | |
408 | } | |
409 | ||
61822ab5 | 410 | static void |
6d884e8f | 411 | nfs_mark_request_dirty(struct nfs_page *req) |
61822ab5 | 412 | { |
61822ab5 TM |
413 | __set_page_dirty_nobuffers(req->wb_page); |
414 | } | |
415 | ||
1da177e4 LT |
416 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
417 | /* | |
418 | * Add a request to the inode's commit list. | |
419 | */ | |
420 | static void | |
421 | nfs_mark_request_commit(struct nfs_page *req) | |
422 | { | |
88be9f99 | 423 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
1da177e4 LT |
424 | struct nfs_inode *nfsi = NFS_I(inode); |
425 | ||
587142f8 | 426 | spin_lock(&inode->i_lock); |
e468bae9 | 427 | set_bit(PG_CLEAN, &(req)->wb_flags); |
5c369683 TM |
428 | radix_tree_tag_set(&nfsi->nfs_page_tree, |
429 | req->wb_index, | |
430 | NFS_PAGE_TAG_COMMIT); | |
587142f8 | 431 | spin_unlock(&inode->i_lock); |
fd39fc85 | 432 | inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 | 433 | inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE); |
a1803044 | 434 | __mark_inode_dirty(inode, I_DIRTY_DATASYNC); |
1da177e4 | 435 | } |
8e821cad | 436 | |
e468bae9 TM |
437 | static int |
438 | nfs_clear_request_commit(struct nfs_page *req) | |
439 | { | |
440 | struct page *page = req->wb_page; | |
441 | ||
442 | if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) { | |
443 | dec_zone_page_state(page, NR_UNSTABLE_NFS); | |
444 | dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE); | |
445 | return 1; | |
446 | } | |
447 | return 0; | |
448 | } | |
449 | ||
8e821cad TM |
450 | static inline |
451 | int nfs_write_need_commit(struct nfs_write_data *data) | |
452 | { | |
453 | return data->verf.committed != NFS_FILE_SYNC; | |
454 | } | |
455 | ||
456 | static inline | |
457 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
458 | { | |
e468bae9 | 459 | if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) { |
8e821cad TM |
460 | nfs_mark_request_commit(req); |
461 | return 1; | |
462 | } | |
463 | if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) { | |
6d884e8f | 464 | nfs_mark_request_dirty(req); |
8e821cad TM |
465 | return 1; |
466 | } | |
467 | return 0; | |
468 | } | |
469 | #else | |
470 | static inline void | |
471 | nfs_mark_request_commit(struct nfs_page *req) | |
472 | { | |
473 | } | |
474 | ||
e468bae9 TM |
475 | static inline int |
476 | nfs_clear_request_commit(struct nfs_page *req) | |
477 | { | |
478 | return 0; | |
479 | } | |
480 | ||
8e821cad TM |
481 | static inline |
482 | int nfs_write_need_commit(struct nfs_write_data *data) | |
483 | { | |
484 | return 0; | |
485 | } | |
486 | ||
487 | static inline | |
488 | int nfs_reschedule_unstable_write(struct nfs_page *req) | |
489 | { | |
490 | return 0; | |
491 | } | |
1da177e4 LT |
492 | #endif |
493 | ||
494 | /* | |
495 | * Wait for a request to complete. | |
496 | * | |
150030b7 | 497 | * Interruptible by fatal signals only. |
1da177e4 | 498 | */ |
ca52fec1 | 499 | static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
500 | { |
501 | struct nfs_inode *nfsi = NFS_I(inode); | |
502 | struct nfs_page *req; | |
ca52fec1 | 503 | pgoff_t idx_end, next; |
1da177e4 LT |
504 | unsigned int res = 0; |
505 | int error; | |
506 | ||
507 | if (npages == 0) | |
508 | idx_end = ~0; | |
509 | else | |
510 | idx_end = idx_start + npages - 1; | |
511 | ||
1da177e4 | 512 | next = idx_start; |
9fd367f0 | 513 | while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) { |
1da177e4 LT |
514 | if (req->wb_index > idx_end) |
515 | break; | |
516 | ||
517 | next = req->wb_index + 1; | |
c6a556b8 | 518 | BUG_ON(!NFS_WBACK_BUSY(req)); |
1da177e4 | 519 | |
c03b4024 | 520 | kref_get(&req->wb_kref); |
587142f8 | 521 | spin_unlock(&inode->i_lock); |
1da177e4 LT |
522 | error = nfs_wait_on_request(req); |
523 | nfs_release_request(req); | |
587142f8 | 524 | spin_lock(&inode->i_lock); |
1da177e4 LT |
525 | if (error < 0) |
526 | return error; | |
1da177e4 LT |
527 | res++; |
528 | } | |
1da177e4 LT |
529 | return res; |
530 | } | |
531 | ||
83715ad5 TM |
532 | static void nfs_cancel_commit_list(struct list_head *head) |
533 | { | |
534 | struct nfs_page *req; | |
535 | ||
536 | while(!list_empty(head)) { | |
537 | req = nfs_list_entry(head->next); | |
538 | nfs_list_remove_request(req); | |
e468bae9 | 539 | nfs_clear_request_commit(req); |
83715ad5 | 540 | nfs_inode_remove_request(req); |
b6dff26a | 541 | nfs_unlock_request(req); |
83715ad5 TM |
542 | } |
543 | } | |
544 | ||
47c62564 | 545 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
fb8a1f11 TM |
546 | static int |
547 | nfs_need_commit(struct nfs_inode *nfsi) | |
548 | { | |
549 | return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT); | |
550 | } | |
551 | ||
1da177e4 LT |
552 | /* |
553 | * nfs_scan_commit - Scan an inode for commit requests | |
554 | * @inode: NFS inode to scan | |
555 | * @dst: destination list | |
556 | * @idx_start: lower bound of page->index to scan. | |
557 | * @npages: idx_start + npages sets the upper bound to scan. | |
558 | * | |
559 | * Moves requests from the inode's 'commit' request list. | |
560 | * The requests are *not* checked to ensure that they form a contiguous set. | |
561 | */ | |
562 | static int | |
ca52fec1 | 563 | nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
1da177e4 LT |
564 | { |
565 | struct nfs_inode *nfsi = NFS_I(inode); | |
3da28eb1 | 566 | |
fb8a1f11 TM |
567 | if (!nfs_need_commit(nfsi)) |
568 | return 0; | |
569 | ||
570 | return nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT); | |
1da177e4 | 571 | } |
c42de9dd | 572 | #else |
fb8a1f11 TM |
573 | static inline int nfs_need_commit(struct nfs_inode *nfsi) |
574 | { | |
575 | return 0; | |
576 | } | |
577 | ||
ca52fec1 | 578 | static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages) |
c42de9dd TM |
579 | { |
580 | return 0; | |
581 | } | |
1da177e4 LT |
582 | #endif |
583 | ||
1da177e4 | 584 | /* |
e7d39069 TM |
585 | * Search for an existing write request, and attempt to update |
586 | * it to reflect a new dirty region on a given page. | |
1da177e4 | 587 | * |
e7d39069 TM |
588 | * If the attempt fails, then the existing request is flushed out |
589 | * to disk. | |
1da177e4 | 590 | */ |
e7d39069 TM |
591 | static struct nfs_page *nfs_try_to_update_request(struct inode *inode, |
592 | struct page *page, | |
593 | unsigned int offset, | |
594 | unsigned int bytes) | |
1da177e4 | 595 | { |
e7d39069 TM |
596 | struct nfs_page *req; |
597 | unsigned int rqend; | |
598 | unsigned int end; | |
599 | int error; | |
600 | ||
601 | if (!PagePrivate(page)) | |
602 | return NULL; | |
1da177e4 LT |
603 | |
604 | end = offset + bytes; | |
e7d39069 | 605 | spin_lock(&inode->i_lock); |
1da177e4 | 606 | |
1da177e4 | 607 | for (;;) { |
277459d2 | 608 | req = nfs_page_find_request_locked(page); |
e7d39069 TM |
609 | if (req == NULL) |
610 | goto out_unlock; | |
611 | ||
612 | rqend = req->wb_offset + req->wb_bytes; | |
613 | /* | |
614 | * Tell the caller to flush out the request if | |
615 | * the offsets are non-contiguous. | |
616 | * Note: nfs_flush_incompatible() will already | |
617 | * have flushed out requests having wrong owners. | |
618 | */ | |
e468bae9 | 619 | if (offset > rqend |
e7d39069 TM |
620 | || end < req->wb_offset) |
621 | goto out_flushme; | |
622 | ||
623 | if (nfs_set_page_tag_locked(req)) | |
1da177e4 | 624 | break; |
1da177e4 | 625 | |
e7d39069 | 626 | /* The request is locked, so wait and then retry */ |
587142f8 | 627 | spin_unlock(&inode->i_lock); |
e7d39069 TM |
628 | error = nfs_wait_on_request(req); |
629 | nfs_release_request(req); | |
630 | if (error != 0) | |
631 | goto out_err; | |
632 | spin_lock(&inode->i_lock); | |
1da177e4 LT |
633 | } |
634 | ||
e468bae9 TM |
635 | if (nfs_clear_request_commit(req)) |
636 | radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree, | |
637 | req->wb_index, NFS_PAGE_TAG_COMMIT); | |
638 | ||
1da177e4 LT |
639 | /* Okay, the request matches. Update the region */ |
640 | if (offset < req->wb_offset) { | |
641 | req->wb_offset = offset; | |
642 | req->wb_pgbase = offset; | |
1da177e4 | 643 | } |
1da177e4 LT |
644 | if (end > rqend) |
645 | req->wb_bytes = end - req->wb_offset; | |
e7d39069 TM |
646 | else |
647 | req->wb_bytes = rqend - req->wb_offset; | |
648 | out_unlock: | |
649 | spin_unlock(&inode->i_lock); | |
650 | return req; | |
651 | out_flushme: | |
652 | spin_unlock(&inode->i_lock); | |
653 | nfs_release_request(req); | |
654 | error = nfs_wb_page(inode, page); | |
655 | out_err: | |
656 | return ERR_PTR(error); | |
657 | } | |
658 | ||
659 | /* | |
660 | * Try to update an existing write request, or create one if there is none. | |
661 | * | |
662 | * Note: Should always be called with the Page Lock held to prevent races | |
663 | * if we have to add a new request. Also assumes that the caller has | |
664 | * already called nfs_flush_incompatible() if necessary. | |
665 | */ | |
666 | static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx, | |
667 | struct page *page, unsigned int offset, unsigned int bytes) | |
668 | { | |
669 | struct inode *inode = page->mapping->host; | |
670 | struct nfs_page *req; | |
671 | int error; | |
1da177e4 | 672 | |
e7d39069 TM |
673 | req = nfs_try_to_update_request(inode, page, offset, bytes); |
674 | if (req != NULL) | |
675 | goto out; | |
676 | req = nfs_create_request(ctx, inode, page, offset, bytes); | |
677 | if (IS_ERR(req)) | |
678 | goto out; | |
679 | error = nfs_inode_add_request(inode, req); | |
680 | if (error != 0) { | |
681 | nfs_release_request(req); | |
682 | req = ERR_PTR(error); | |
683 | } | |
efc91ed0 | 684 | out: |
61e930a9 | 685 | return req; |
1da177e4 LT |
686 | } |
687 | ||
e7d39069 TM |
688 | static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page, |
689 | unsigned int offset, unsigned int count) | |
690 | { | |
691 | struct nfs_page *req; | |
692 | ||
693 | req = nfs_setup_write_request(ctx, page, offset, count); | |
694 | if (IS_ERR(req)) | |
695 | return PTR_ERR(req); | |
696 | /* Update file length */ | |
697 | nfs_grow_file(page, offset, count); | |
698 | nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes); | |
699 | nfs_clear_page_tag_locked(req); | |
700 | return 0; | |
701 | } | |
702 | ||
1da177e4 LT |
703 | int nfs_flush_incompatible(struct file *file, struct page *page) |
704 | { | |
cd3758e3 | 705 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 706 | struct nfs_page *req; |
1a54533e | 707 | int do_flush, status; |
1da177e4 LT |
708 | /* |
709 | * Look for a request corresponding to this page. If there | |
710 | * is one, and it belongs to another file, we flush it out | |
711 | * before we try to copy anything into the page. Do this | |
712 | * due to the lack of an ACCESS-type call in NFSv2. | |
713 | * Also do the same if we find a request from an existing | |
714 | * dropped page. | |
715 | */ | |
1a54533e TM |
716 | do { |
717 | req = nfs_page_find_request(page); | |
718 | if (req == NULL) | |
719 | return 0; | |
e468bae9 | 720 | do_flush = req->wb_page != page || req->wb_context != ctx; |
1da177e4 | 721 | nfs_release_request(req); |
1a54533e TM |
722 | if (!do_flush) |
723 | return 0; | |
724 | status = nfs_wb_page(page->mapping->host, page); | |
725 | } while (status == 0); | |
726 | return status; | |
1da177e4 LT |
727 | } |
728 | ||
5d47a356 TM |
729 | /* |
730 | * If the page cache is marked as unsafe or invalid, then we can't rely on | |
731 | * the PageUptodate() flag. In this case, we will need to turn off | |
732 | * write optimisations that depend on the page contents being correct. | |
733 | */ | |
734 | static int nfs_write_pageuptodate(struct page *page, struct inode *inode) | |
735 | { | |
736 | return PageUptodate(page) && | |
737 | !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA)); | |
738 | } | |
739 | ||
1da177e4 LT |
740 | /* |
741 | * Update and possibly write a cached page of an NFS file. | |
742 | * | |
743 | * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad | |
744 | * things with a page scheduled for an RPC call (e.g. invalidate it). | |
745 | */ | |
746 | int nfs_updatepage(struct file *file, struct page *page, | |
747 | unsigned int offset, unsigned int count) | |
748 | { | |
cd3758e3 | 749 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 750 | struct inode *inode = page->mapping->host; |
1da177e4 LT |
751 | int status = 0; |
752 | ||
91d5b470 CL |
753 | nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE); |
754 | ||
48186c7d | 755 | dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n", |
01cce933 JJS |
756 | file->f_path.dentry->d_parent->d_name.name, |
757 | file->f_path.dentry->d_name.name, count, | |
48186c7d | 758 | (long long)(page_offset(page) + offset)); |
1da177e4 | 759 | |
1da177e4 | 760 | /* If we're not using byte range locks, and we know the page |
5d47a356 TM |
761 | * is up to date, it may be more efficient to extend the write |
762 | * to cover the entire page in order to avoid fragmentation | |
763 | * inefficiencies. | |
1da177e4 | 764 | */ |
5d47a356 TM |
765 | if (nfs_write_pageuptodate(page, inode) && |
766 | inode->i_flock == NULL && | |
4b5621f6 | 767 | !(file->f_flags & O_SYNC)) { |
49a70f27 | 768 | count = max(count + offset, nfs_page_length(page)); |
1da177e4 | 769 | offset = 0; |
1da177e4 LT |
770 | } |
771 | ||
e21195a7 | 772 | status = nfs_writepage_setup(ctx, page, offset, count); |
03fa9e84 TM |
773 | if (status < 0) |
774 | nfs_set_pageerror(page); | |
775 | else | |
776 | __set_page_dirty_nobuffers(page); | |
1da177e4 | 777 | |
48186c7d | 778 | dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n", |
1da177e4 | 779 | status, (long long)i_size_read(inode)); |
1da177e4 LT |
780 | return status; |
781 | } | |
782 | ||
783 | static void nfs_writepage_release(struct nfs_page *req) | |
784 | { | |
1da177e4 | 785 | |
7e5f6146 | 786 | if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) { |
8e821cad TM |
787 | nfs_end_page_writeback(req->wb_page); |
788 | nfs_inode_remove_request(req); | |
789 | } else | |
790 | nfs_end_page_writeback(req->wb_page); | |
9fd367f0 | 791 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
792 | } |
793 | ||
3ff7576d | 794 | static int flush_task_priority(int how) |
1da177e4 LT |
795 | { |
796 | switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) { | |
797 | case FLUSH_HIGHPRI: | |
798 | return RPC_PRIORITY_HIGH; | |
799 | case FLUSH_LOWPRI: | |
800 | return RPC_PRIORITY_LOW; | |
801 | } | |
802 | return RPC_PRIORITY_NORMAL; | |
803 | } | |
804 | ||
805 | /* | |
806 | * Set up the argument/result storage required for the RPC call. | |
807 | */ | |
dbae4c73 | 808 | static int nfs_write_rpcsetup(struct nfs_page *req, |
1da177e4 | 809 | struct nfs_write_data *data, |
788e7a89 | 810 | const struct rpc_call_ops *call_ops, |
1da177e4 LT |
811 | unsigned int count, unsigned int offset, |
812 | int how) | |
813 | { | |
84115e1c TM |
814 | struct inode *inode = req->wb_context->path.dentry->d_inode; |
815 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
3ff7576d | 816 | int priority = flush_task_priority(how); |
07737691 | 817 | struct rpc_task *task; |
bdc7f021 TM |
818 | struct rpc_message msg = { |
819 | .rpc_argp = &data->args, | |
820 | .rpc_resp = &data->res, | |
821 | .rpc_cred = req->wb_context->cred, | |
822 | }; | |
84115e1c TM |
823 | struct rpc_task_setup task_setup_data = { |
824 | .rpc_client = NFS_CLIENT(inode), | |
07737691 | 825 | .task = &data->task, |
bdc7f021 | 826 | .rpc_message = &msg, |
84115e1c TM |
827 | .callback_ops = call_ops, |
828 | .callback_data = data, | |
101070ca | 829 | .workqueue = nfsiod_workqueue, |
84115e1c | 830 | .flags = flags, |
3ff7576d | 831 | .priority = priority, |
84115e1c | 832 | }; |
1da177e4 LT |
833 | |
834 | /* Set up the RPC argument and reply structs | |
835 | * NB: take care not to mess about with data->commit et al. */ | |
836 | ||
837 | data->req = req; | |
88be9f99 | 838 | data->inode = inode = req->wb_context->path.dentry->d_inode; |
bdc7f021 | 839 | data->cred = msg.rpc_cred; |
1da177e4 LT |
840 | |
841 | data->args.fh = NFS_FH(inode); | |
842 | data->args.offset = req_offset(req) + offset; | |
843 | data->args.pgbase = req->wb_pgbase + offset; | |
844 | data->args.pages = data->pagevec; | |
845 | data->args.count = count; | |
383ba719 | 846 | data->args.context = get_nfs_open_context(req->wb_context); |
bdc7f021 TM |
847 | data->args.stable = NFS_UNSTABLE; |
848 | if (how & FLUSH_STABLE) { | |
849 | data->args.stable = NFS_DATA_SYNC; | |
fb8a1f11 | 850 | if (!nfs_need_commit(NFS_I(inode))) |
bdc7f021 TM |
851 | data->args.stable = NFS_FILE_SYNC; |
852 | } | |
1da177e4 LT |
853 | |
854 | data->res.fattr = &data->fattr; | |
855 | data->res.count = count; | |
856 | data->res.verf = &data->verf; | |
0e574af1 | 857 | nfs_fattr_init(&data->fattr); |
1da177e4 | 858 | |
788e7a89 | 859 | /* Set up the initial task struct. */ |
bdc7f021 | 860 | NFS_PROTO(inode)->write_setup(data, &msg); |
1da177e4 | 861 | |
a3f565b1 | 862 | dprintk("NFS: %5u initiated write call " |
48186c7d | 863 | "(req %s/%lld, %u bytes @ offset %llu)\n", |
0bbacc40 | 864 | data->task.tk_pid, |
1da177e4 LT |
865 | inode->i_sb->s_id, |
866 | (long long)NFS_FILEID(inode), | |
867 | count, | |
868 | (unsigned long long)data->args.offset); | |
1da177e4 | 869 | |
07737691 | 870 | task = rpc_run_task(&task_setup_data); |
dbae4c73 TM |
871 | if (IS_ERR(task)) |
872 | return PTR_ERR(task); | |
873 | rpc_put_task(task); | |
874 | return 0; | |
1da177e4 LT |
875 | } |
876 | ||
6d884e8f F |
877 | /* If a nfs_flush_* function fails, it should remove reqs from @head and |
878 | * call this on each, which will prepare them to be retried on next | |
879 | * writeback using standard nfs. | |
880 | */ | |
881 | static void nfs_redirty_request(struct nfs_page *req) | |
882 | { | |
883 | nfs_mark_request_dirty(req); | |
884 | nfs_end_page_writeback(req->wb_page); | |
885 | nfs_clear_page_tag_locked(req); | |
886 | } | |
887 | ||
1da177e4 LT |
888 | /* |
889 | * Generate multiple small requests to write out a single | |
890 | * contiguous dirty area on one page. | |
891 | */ | |
8d5658c9 | 892 | static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
893 | { |
894 | struct nfs_page *req = nfs_list_entry(head->next); | |
895 | struct page *page = req->wb_page; | |
896 | struct nfs_write_data *data; | |
e9f7bee1 TM |
897 | size_t wsize = NFS_SERVER(inode)->wsize, nbytes; |
898 | unsigned int offset; | |
1da177e4 | 899 | int requests = 0; |
dbae4c73 | 900 | int ret = 0; |
1da177e4 LT |
901 | LIST_HEAD(list); |
902 | ||
903 | nfs_list_remove_request(req); | |
904 | ||
bcb71bba | 905 | nbytes = count; |
e9f7bee1 TM |
906 | do { |
907 | size_t len = min(nbytes, wsize); | |
908 | ||
8d5658c9 | 909 | data = nfs_writedata_alloc(1); |
1da177e4 LT |
910 | if (!data) |
911 | goto out_bad; | |
912 | list_add(&data->pages, &list); | |
913 | requests++; | |
e9f7bee1 TM |
914 | nbytes -= len; |
915 | } while (nbytes != 0); | |
1da177e4 LT |
916 | atomic_set(&req->wb_complete, requests); |
917 | ||
918 | ClearPageError(page); | |
1da177e4 | 919 | offset = 0; |
bcb71bba | 920 | nbytes = count; |
1da177e4 | 921 | do { |
dbae4c73 TM |
922 | int ret2; |
923 | ||
1da177e4 LT |
924 | data = list_entry(list.next, struct nfs_write_data, pages); |
925 | list_del_init(&data->pages); | |
926 | ||
927 | data->pagevec[0] = page; | |
1da177e4 | 928 | |
bcb71bba TM |
929 | if (nbytes < wsize) |
930 | wsize = nbytes; | |
dbae4c73 | 931 | ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops, |
bcb71bba | 932 | wsize, offset, how); |
dbae4c73 TM |
933 | if (ret == 0) |
934 | ret = ret2; | |
bcb71bba TM |
935 | offset += wsize; |
936 | nbytes -= wsize; | |
1da177e4 LT |
937 | } while (nbytes != 0); |
938 | ||
dbae4c73 | 939 | return ret; |
1da177e4 LT |
940 | |
941 | out_bad: | |
942 | while (!list_empty(&list)) { | |
943 | data = list_entry(list.next, struct nfs_write_data, pages); | |
944 | list_del(&data->pages); | |
8aca67f0 | 945 | nfs_writedata_release(data); |
1da177e4 | 946 | } |
61822ab5 | 947 | nfs_redirty_request(req); |
1da177e4 LT |
948 | return -ENOMEM; |
949 | } | |
950 | ||
951 | /* | |
952 | * Create an RPC task for the given write request and kick it. | |
953 | * The page must have been locked by the caller. | |
954 | * | |
955 | * It may happen that the page we're passed is not marked dirty. | |
956 | * This is the case if nfs_updatepage detects a conflicting request | |
957 | * that has been written but not committed. | |
958 | */ | |
8d5658c9 | 959 | static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how) |
1da177e4 LT |
960 | { |
961 | struct nfs_page *req; | |
962 | struct page **pages; | |
963 | struct nfs_write_data *data; | |
1da177e4 | 964 | |
8d5658c9 | 965 | data = nfs_writedata_alloc(npages); |
1da177e4 LT |
966 | if (!data) |
967 | goto out_bad; | |
968 | ||
969 | pages = data->pagevec; | |
1da177e4 LT |
970 | while (!list_empty(head)) { |
971 | req = nfs_list_entry(head->next); | |
972 | nfs_list_remove_request(req); | |
973 | nfs_list_add_request(req, &data->pages); | |
974 | ClearPageError(req->wb_page); | |
1da177e4 | 975 | *pages++ = req->wb_page; |
1da177e4 LT |
976 | } |
977 | req = nfs_list_entry(data->pages.next); | |
978 | ||
1da177e4 | 979 | /* Set up the argument struct */ |
dbae4c73 | 980 | return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how); |
1da177e4 LT |
981 | out_bad: |
982 | while (!list_empty(head)) { | |
10afec90 | 983 | req = nfs_list_entry(head->next); |
1da177e4 | 984 | nfs_list_remove_request(req); |
61822ab5 | 985 | nfs_redirty_request(req); |
1da177e4 LT |
986 | } |
987 | return -ENOMEM; | |
988 | } | |
989 | ||
c63c7b05 TM |
990 | static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, |
991 | struct inode *inode, int ioflags) | |
1da177e4 | 992 | { |
bf4285e7 | 993 | size_t wsize = NFS_SERVER(inode)->wsize; |
1da177e4 | 994 | |
bcb71bba | 995 | if (wsize < PAGE_CACHE_SIZE) |
c63c7b05 | 996 | nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags); |
bcb71bba | 997 | else |
c63c7b05 | 998 | nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags); |
1da177e4 LT |
999 | } |
1000 | ||
1001 | /* | |
1002 | * Handle a write reply that flushed part of a page. | |
1003 | */ | |
788e7a89 | 1004 | static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata) |
1da177e4 | 1005 | { |
788e7a89 | 1006 | struct nfs_write_data *data = calldata; |
1da177e4 | 1007 | |
48186c7d CL |
1008 | dprintk("NFS: %5u write(%s/%lld %d@%lld)", |
1009 | task->tk_pid, | |
1010 | data->req->wb_context->path.dentry->d_inode->i_sb->s_id, | |
1011 | (long long) | |
1012 | NFS_FILEID(data->req->wb_context->path.dentry->d_inode), | |
1013 | data->req->wb_bytes, (long long)req_offset(data->req)); | |
1da177e4 | 1014 | |
c9d8f89d TM |
1015 | nfs_writeback_done(task, data); |
1016 | } | |
788e7a89 | 1017 | |
c9d8f89d TM |
1018 | static void nfs_writeback_release_partial(void *calldata) |
1019 | { | |
1020 | struct nfs_write_data *data = calldata; | |
1021 | struct nfs_page *req = data->req; | |
1022 | struct page *page = req->wb_page; | |
1023 | int status = data->task.tk_status; | |
1024 | ||
1025 | if (status < 0) { | |
a301b777 | 1026 | nfs_set_pageerror(page); |
c9d8f89d TM |
1027 | nfs_context_set_write_error(req->wb_context, status); |
1028 | dprintk(", error = %d\n", status); | |
8e821cad | 1029 | goto out; |
1da177e4 LT |
1030 | } |
1031 | ||
8e821cad | 1032 | if (nfs_write_need_commit(data)) { |
587142f8 | 1033 | struct inode *inode = page->mapping->host; |
8e821cad | 1034 | |
587142f8 | 1035 | spin_lock(&inode->i_lock); |
8e821cad TM |
1036 | if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) { |
1037 | /* Do nothing we need to resend the writes */ | |
1038 | } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) { | |
1039 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1040 | dprintk(" defer commit\n"); | |
1041 | } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) { | |
1042 | set_bit(PG_NEED_RESCHED, &req->wb_flags); | |
1043 | clear_bit(PG_NEED_COMMIT, &req->wb_flags); | |
1044 | dprintk(" server reboot detected\n"); | |
1045 | } | |
587142f8 | 1046 | spin_unlock(&inode->i_lock); |
8e821cad TM |
1047 | } else |
1048 | dprintk(" OK\n"); | |
1049 | ||
1050 | out: | |
1da177e4 LT |
1051 | if (atomic_dec_and_test(&req->wb_complete)) |
1052 | nfs_writepage_release(req); | |
c9d8f89d | 1053 | nfs_writedata_release(calldata); |
1da177e4 LT |
1054 | } |
1055 | ||
def6ed7e AA |
1056 | #if defined(CONFIG_NFS_V4_1) |
1057 | void nfs_write_prepare(struct rpc_task *task, void *calldata) | |
1058 | { | |
1059 | struct nfs_write_data *data = calldata; | |
1060 | struct nfs_client *clp = (NFS_SERVER(data->inode))->nfs_client; | |
1061 | ||
1062 | if (nfs4_setup_sequence(clp, &data->args.seq_args, | |
1063 | &data->res.seq_res, 1, task)) | |
1064 | return; | |
1065 | rpc_call_start(task); | |
1066 | } | |
1067 | #endif /* CONFIG_NFS_V4_1 */ | |
1068 | ||
788e7a89 | 1069 | static const struct rpc_call_ops nfs_write_partial_ops = { |
def6ed7e AA |
1070 | #if defined(CONFIG_NFS_V4_1) |
1071 | .rpc_call_prepare = nfs_write_prepare, | |
1072 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1073 | .rpc_call_done = nfs_writeback_done_partial, |
c9d8f89d | 1074 | .rpc_release = nfs_writeback_release_partial, |
788e7a89 TM |
1075 | }; |
1076 | ||
1da177e4 LT |
1077 | /* |
1078 | * Handle a write reply that flushes a whole page. | |
1079 | * | |
1080 | * FIXME: There is an inherent race with invalidate_inode_pages and | |
1081 | * writebacks since the page->count is kept > 1 for as long | |
1082 | * as the page has a write request pending. | |
1083 | */ | |
788e7a89 | 1084 | static void nfs_writeback_done_full(struct rpc_task *task, void *calldata) |
1da177e4 | 1085 | { |
788e7a89 | 1086 | struct nfs_write_data *data = calldata; |
1da177e4 | 1087 | |
c9d8f89d TM |
1088 | nfs_writeback_done(task, data); |
1089 | } | |
1090 | ||
1091 | static void nfs_writeback_release_full(void *calldata) | |
1092 | { | |
1093 | struct nfs_write_data *data = calldata; | |
1094 | int status = data->task.tk_status; | |
788e7a89 | 1095 | |
1da177e4 LT |
1096 | /* Update attributes as result of writeback. */ |
1097 | while (!list_empty(&data->pages)) { | |
c9d8f89d TM |
1098 | struct nfs_page *req = nfs_list_entry(data->pages.next); |
1099 | struct page *page = req->wb_page; | |
1100 | ||
1da177e4 | 1101 | nfs_list_remove_request(req); |
1da177e4 | 1102 | |
48186c7d CL |
1103 | dprintk("NFS: %5u write (%s/%lld %d@%lld)", |
1104 | data->task.tk_pid, | |
88be9f99 TM |
1105 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1106 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1107 | req->wb_bytes, |
1108 | (long long)req_offset(req)); | |
1109 | ||
c9d8f89d | 1110 | if (status < 0) { |
a301b777 | 1111 | nfs_set_pageerror(page); |
c9d8f89d TM |
1112 | nfs_context_set_write_error(req->wb_context, status); |
1113 | dprintk(", error = %d\n", status); | |
8e821cad | 1114 | goto remove_request; |
1da177e4 | 1115 | } |
1da177e4 | 1116 | |
8e821cad TM |
1117 | if (nfs_write_need_commit(data)) { |
1118 | memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf)); | |
1119 | nfs_mark_request_commit(req); | |
1120 | nfs_end_page_writeback(page); | |
1121 | dprintk(" marked for commit\n"); | |
1da177e4 LT |
1122 | goto next; |
1123 | } | |
8e821cad TM |
1124 | dprintk(" OK\n"); |
1125 | remove_request: | |
1126 | nfs_end_page_writeback(page); | |
1da177e4 | 1127 | nfs_inode_remove_request(req); |
1da177e4 | 1128 | next: |
9fd367f0 | 1129 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1130 | } |
c9d8f89d | 1131 | nfs_writedata_release(calldata); |
1da177e4 LT |
1132 | } |
1133 | ||
788e7a89 | 1134 | static const struct rpc_call_ops nfs_write_full_ops = { |
def6ed7e AA |
1135 | #if defined(CONFIG_NFS_V4_1) |
1136 | .rpc_call_prepare = nfs_write_prepare, | |
1137 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 | 1138 | .rpc_call_done = nfs_writeback_done_full, |
c9d8f89d | 1139 | .rpc_release = nfs_writeback_release_full, |
788e7a89 TM |
1140 | }; |
1141 | ||
1142 | ||
1da177e4 LT |
1143 | /* |
1144 | * This function is called when the WRITE call is complete. | |
1145 | */ | |
462d5b32 | 1146 | int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data) |
1da177e4 | 1147 | { |
1da177e4 LT |
1148 | struct nfs_writeargs *argp = &data->args; |
1149 | struct nfs_writeres *resp = &data->res; | |
eedc020e | 1150 | struct nfs_server *server = NFS_SERVER(data->inode); |
788e7a89 | 1151 | int status; |
1da177e4 | 1152 | |
a3f565b1 | 1153 | dprintk("NFS: %5u nfs_writeback_done (status %d)\n", |
1da177e4 LT |
1154 | task->tk_pid, task->tk_status); |
1155 | ||
f551e44f CL |
1156 | /* |
1157 | * ->write_done will attempt to use post-op attributes to detect | |
1158 | * conflicting writes by other clients. A strict interpretation | |
1159 | * of close-to-open would allow us to continue caching even if | |
1160 | * another writer had changed the file, but some applications | |
1161 | * depend on tighter cache coherency when writing. | |
1162 | */ | |
788e7a89 TM |
1163 | status = NFS_PROTO(data->inode)->write_done(task, data); |
1164 | if (status != 0) | |
1165 | return status; | |
91d5b470 CL |
1166 | nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count); |
1167 | ||
1da177e4 LT |
1168 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) |
1169 | if (resp->verf->committed < argp->stable && task->tk_status >= 0) { | |
1170 | /* We tried a write call, but the server did not | |
1171 | * commit data to stable storage even though we | |
1172 | * requested it. | |
1173 | * Note: There is a known bug in Tru64 < 5.0 in which | |
1174 | * the server reports NFS_DATA_SYNC, but performs | |
1175 | * NFS_FILE_SYNC. We therefore implement this checking | |
1176 | * as a dprintk() in order to avoid filling syslog. | |
1177 | */ | |
1178 | static unsigned long complain; | |
1179 | ||
1180 | if (time_before(complain, jiffies)) { | |
48186c7d | 1181 | dprintk("NFS: faulty NFS server %s:" |
1da177e4 | 1182 | " (committed = %d) != (stable = %d)\n", |
eedc020e | 1183 | server->nfs_client->cl_hostname, |
1da177e4 LT |
1184 | resp->verf->committed, argp->stable); |
1185 | complain = jiffies + 300 * HZ; | |
1186 | } | |
1187 | } | |
1188 | #endif | |
1189 | /* Is this a short write? */ | |
1190 | if (task->tk_status >= 0 && resp->count < argp->count) { | |
1191 | static unsigned long complain; | |
1192 | ||
91d5b470 CL |
1193 | nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE); |
1194 | ||
1da177e4 LT |
1195 | /* Has the server at least made some progress? */ |
1196 | if (resp->count != 0) { | |
1197 | /* Was this an NFSv2 write or an NFSv3 stable write? */ | |
1198 | if (resp->verf->committed != NFS_UNSTABLE) { | |
1199 | /* Resend from where the server left off */ | |
1200 | argp->offset += resp->count; | |
1201 | argp->pgbase += resp->count; | |
1202 | argp->count -= resp->count; | |
1203 | } else { | |
1204 | /* Resend as a stable write in order to avoid | |
1205 | * headaches in the case of a server crash. | |
1206 | */ | |
1207 | argp->stable = NFS_FILE_SYNC; | |
1208 | } | |
eedc020e | 1209 | nfs4_restart_rpc(task, server->nfs_client); |
788e7a89 | 1210 | return -EAGAIN; |
1da177e4 LT |
1211 | } |
1212 | if (time_before(complain, jiffies)) { | |
1213 | printk(KERN_WARNING | |
1214 | "NFS: Server wrote zero bytes, expected %u.\n", | |
1215 | argp->count); | |
1216 | complain = jiffies + 300 * HZ; | |
1217 | } | |
1218 | /* Can't do anything about it except throw an error. */ | |
1219 | task->tk_status = -EIO; | |
1220 | } | |
eedc020e | 1221 | nfs4_sequence_free_slot(server->nfs_client, &data->res.seq_res); |
788e7a89 | 1222 | return 0; |
1da177e4 LT |
1223 | } |
1224 | ||
1225 | ||
1226 | #if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4) | |
c9d8f89d | 1227 | void nfs_commitdata_release(void *data) |
1da177e4 | 1228 | { |
383ba719 TM |
1229 | struct nfs_write_data *wdata = data; |
1230 | ||
1231 | put_nfs_open_context(wdata->args.context); | |
1da177e4 LT |
1232 | nfs_commit_free(wdata); |
1233 | } | |
1234 | ||
1235 | /* | |
1236 | * Set up the argument/result storage required for the RPC call. | |
1237 | */ | |
dbae4c73 | 1238 | static int nfs_commit_rpcsetup(struct list_head *head, |
788e7a89 TM |
1239 | struct nfs_write_data *data, |
1240 | int how) | |
1da177e4 | 1241 | { |
84115e1c TM |
1242 | struct nfs_page *first = nfs_list_entry(head->next); |
1243 | struct inode *inode = first->wb_context->path.dentry->d_inode; | |
1244 | int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC; | |
3ff7576d | 1245 | int priority = flush_task_priority(how); |
07737691 | 1246 | struct rpc_task *task; |
bdc7f021 TM |
1247 | struct rpc_message msg = { |
1248 | .rpc_argp = &data->args, | |
1249 | .rpc_resp = &data->res, | |
1250 | .rpc_cred = first->wb_context->cred, | |
1251 | }; | |
84115e1c | 1252 | struct rpc_task_setup task_setup_data = { |
07737691 | 1253 | .task = &data->task, |
84115e1c | 1254 | .rpc_client = NFS_CLIENT(inode), |
bdc7f021 | 1255 | .rpc_message = &msg, |
84115e1c TM |
1256 | .callback_ops = &nfs_commit_ops, |
1257 | .callback_data = data, | |
101070ca | 1258 | .workqueue = nfsiod_workqueue, |
84115e1c | 1259 | .flags = flags, |
3ff7576d | 1260 | .priority = priority, |
84115e1c | 1261 | }; |
1da177e4 LT |
1262 | |
1263 | /* Set up the RPC argument and reply structs | |
1264 | * NB: take care not to mess about with data->commit et al. */ | |
1265 | ||
1266 | list_splice_init(head, &data->pages); | |
1da177e4 | 1267 | |
1da177e4 | 1268 | data->inode = inode; |
bdc7f021 | 1269 | data->cred = msg.rpc_cred; |
1da177e4 LT |
1270 | |
1271 | data->args.fh = NFS_FH(data->inode); | |
3da28eb1 TM |
1272 | /* Note: we always request a commit of the entire inode */ |
1273 | data->args.offset = 0; | |
1274 | data->args.count = 0; | |
383ba719 | 1275 | data->args.context = get_nfs_open_context(first->wb_context); |
3da28eb1 | 1276 | data->res.count = 0; |
1da177e4 LT |
1277 | data->res.fattr = &data->fattr; |
1278 | data->res.verf = &data->verf; | |
0e574af1 | 1279 | nfs_fattr_init(&data->fattr); |
788e7a89 TM |
1280 | |
1281 | /* Set up the initial task struct. */ | |
bdc7f021 | 1282 | NFS_PROTO(inode)->commit_setup(data, &msg); |
1da177e4 | 1283 | |
a3f565b1 | 1284 | dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid); |
bdc7f021 | 1285 | |
07737691 | 1286 | task = rpc_run_task(&task_setup_data); |
dbae4c73 TM |
1287 | if (IS_ERR(task)) |
1288 | return PTR_ERR(task); | |
1289 | rpc_put_task(task); | |
1290 | return 0; | |
1da177e4 LT |
1291 | } |
1292 | ||
1293 | /* | |
1294 | * Commit dirty pages | |
1295 | */ | |
1296 | static int | |
40859d7e | 1297 | nfs_commit_list(struct inode *inode, struct list_head *head, int how) |
1da177e4 LT |
1298 | { |
1299 | struct nfs_write_data *data; | |
1300 | struct nfs_page *req; | |
1301 | ||
c9d8f89d | 1302 | data = nfs_commitdata_alloc(); |
1da177e4 LT |
1303 | |
1304 | if (!data) | |
1305 | goto out_bad; | |
1306 | ||
1307 | /* Set up the argument struct */ | |
dbae4c73 | 1308 | return nfs_commit_rpcsetup(head, data, how); |
1da177e4 LT |
1309 | out_bad: |
1310 | while (!list_empty(head)) { | |
1311 | req = nfs_list_entry(head->next); | |
1312 | nfs_list_remove_request(req); | |
1313 | nfs_mark_request_commit(req); | |
83715ad5 | 1314 | dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS); |
c9e51e41 PZ |
1315 | dec_bdi_stat(req->wb_page->mapping->backing_dev_info, |
1316 | BDI_RECLAIMABLE); | |
9fd367f0 | 1317 | nfs_clear_page_tag_locked(req); |
1da177e4 LT |
1318 | } |
1319 | return -ENOMEM; | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * COMMIT call returned | |
1324 | */ | |
788e7a89 | 1325 | static void nfs_commit_done(struct rpc_task *task, void *calldata) |
1da177e4 | 1326 | { |
963d8fe5 | 1327 | struct nfs_write_data *data = calldata; |
1da177e4 | 1328 | |
a3f565b1 | 1329 | dprintk("NFS: %5u nfs_commit_done (status %d)\n", |
1da177e4 LT |
1330 | task->tk_pid, task->tk_status); |
1331 | ||
788e7a89 TM |
1332 | /* Call the NFS version-specific code */ |
1333 | if (NFS_PROTO(data->inode)->commit_done(task, data) != 0) | |
1334 | return; | |
c9d8f89d TM |
1335 | } |
1336 | ||
1337 | static void nfs_commit_release(void *calldata) | |
1338 | { | |
1339 | struct nfs_write_data *data = calldata; | |
1340 | struct nfs_page *req; | |
1341 | int status = data->task.tk_status; | |
788e7a89 | 1342 | |
1da177e4 LT |
1343 | while (!list_empty(&data->pages)) { |
1344 | req = nfs_list_entry(data->pages.next); | |
1345 | nfs_list_remove_request(req); | |
e468bae9 | 1346 | nfs_clear_request_commit(req); |
1da177e4 | 1347 | |
48186c7d | 1348 | dprintk("NFS: commit (%s/%lld %d@%lld)", |
88be9f99 TM |
1349 | req->wb_context->path.dentry->d_inode->i_sb->s_id, |
1350 | (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode), | |
1da177e4 LT |
1351 | req->wb_bytes, |
1352 | (long long)req_offset(req)); | |
c9d8f89d TM |
1353 | if (status < 0) { |
1354 | nfs_context_set_write_error(req->wb_context, status); | |
1da177e4 | 1355 | nfs_inode_remove_request(req); |
c9d8f89d | 1356 | dprintk(", error = %d\n", status); |
1da177e4 LT |
1357 | goto next; |
1358 | } | |
1359 | ||
1360 | /* Okay, COMMIT succeeded, apparently. Check the verifier | |
1361 | * returned by the server against all stored verfs. */ | |
1362 | if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) { | |
1363 | /* We have a match */ | |
1364 | nfs_inode_remove_request(req); | |
1365 | dprintk(" OK\n"); | |
1366 | goto next; | |
1367 | } | |
1368 | /* We have a mismatch. Write the page again */ | |
1369 | dprintk(" mismatch\n"); | |
6d884e8f | 1370 | nfs_mark_request_dirty(req); |
1da177e4 | 1371 | next: |
9fd367f0 | 1372 | nfs_clear_page_tag_locked(req); |
1da177e4 | 1373 | } |
c9d8f89d | 1374 | nfs_commitdata_release(calldata); |
1da177e4 | 1375 | } |
788e7a89 TM |
1376 | |
1377 | static const struct rpc_call_ops nfs_commit_ops = { | |
21d9a851 AA |
1378 | #if defined(CONFIG_NFS_V4_1) |
1379 | .rpc_call_prepare = nfs_write_prepare, | |
1380 | #endif /* CONFIG_NFS_V4_1 */ | |
788e7a89 TM |
1381 | .rpc_call_done = nfs_commit_done, |
1382 | .rpc_release = nfs_commit_release, | |
1383 | }; | |
1da177e4 | 1384 | |
3da28eb1 | 1385 | int nfs_commit_inode(struct inode *inode, int how) |
1da177e4 | 1386 | { |
1da177e4 | 1387 | LIST_HEAD(head); |
7d46a49f | 1388 | int res; |
1da177e4 | 1389 | |
587142f8 | 1390 | spin_lock(&inode->i_lock); |
3da28eb1 | 1391 | res = nfs_scan_commit(inode, &head, 0, 0); |
587142f8 | 1392 | spin_unlock(&inode->i_lock); |
1da177e4 | 1393 | if (res) { |
7d46a49f | 1394 | int error = nfs_commit_list(inode, &head, how); |
3da28eb1 TM |
1395 | if (error < 0) |
1396 | return error; | |
1397 | } | |
1da177e4 LT |
1398 | return res; |
1399 | } | |
c63c7b05 TM |
1400 | #else |
1401 | static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how) | |
1402 | { | |
1403 | return 0; | |
1404 | } | |
1da177e4 LT |
1405 | #endif |
1406 | ||
1c75950b | 1407 | long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how) |
1da177e4 | 1408 | { |
1c75950b | 1409 | struct inode *inode = mapping->host; |
ca52fec1 | 1410 | pgoff_t idx_start, idx_end; |
1c75950b | 1411 | unsigned int npages = 0; |
c42de9dd | 1412 | LIST_HEAD(head); |
70b9ecbd | 1413 | int nocommit = how & FLUSH_NOCOMMIT; |
3f442547 | 1414 | long pages, ret; |
1da177e4 | 1415 | |
1c75950b TM |
1416 | /* FIXME */ |
1417 | if (wbc->range_cyclic) | |
1418 | idx_start = 0; | |
1419 | else { | |
1420 | idx_start = wbc->range_start >> PAGE_CACHE_SHIFT; | |
1421 | idx_end = wbc->range_end >> PAGE_CACHE_SHIFT; | |
1422 | if (idx_end > idx_start) { | |
ca52fec1 | 1423 | pgoff_t l_npages = 1 + idx_end - idx_start; |
1c75950b TM |
1424 | npages = l_npages; |
1425 | if (sizeof(npages) != sizeof(l_npages) && | |
ca52fec1 | 1426 | (pgoff_t)npages != l_npages) |
1c75950b TM |
1427 | npages = 0; |
1428 | } | |
1429 | } | |
c42de9dd | 1430 | how &= ~FLUSH_NOCOMMIT; |
587142f8 | 1431 | spin_lock(&inode->i_lock); |
1da177e4 | 1432 | do { |
c42de9dd TM |
1433 | ret = nfs_wait_on_requests_locked(inode, idx_start, npages); |
1434 | if (ret != 0) | |
70b9ecbd | 1435 | continue; |
c42de9dd TM |
1436 | if (nocommit) |
1437 | break; | |
d2ccddf0 | 1438 | pages = nfs_scan_commit(inode, &head, idx_start, npages); |
724c439c | 1439 | if (pages == 0) |
c42de9dd | 1440 | break; |
d2ccddf0 | 1441 | if (how & FLUSH_INVALIDATE) { |
587142f8 | 1442 | spin_unlock(&inode->i_lock); |
83715ad5 | 1443 | nfs_cancel_commit_list(&head); |
e8e058e8 | 1444 | ret = pages; |
587142f8 | 1445 | spin_lock(&inode->i_lock); |
d2ccddf0 TM |
1446 | continue; |
1447 | } | |
1448 | pages += nfs_scan_commit(inode, &head, 0, 0); | |
587142f8 | 1449 | spin_unlock(&inode->i_lock); |
c42de9dd | 1450 | ret = nfs_commit_list(inode, &head, how); |
587142f8 TM |
1451 | spin_lock(&inode->i_lock); |
1452 | ||
c42de9dd | 1453 | } while (ret >= 0); |
587142f8 | 1454 | spin_unlock(&inode->i_lock); |
c42de9dd | 1455 | return ret; |
1da177e4 LT |
1456 | } |
1457 | ||
34901f70 | 1458 | static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how) |
1c75950b | 1459 | { |
1c75950b TM |
1460 | int ret; |
1461 | ||
34901f70 | 1462 | ret = nfs_writepages(mapping, wbc); |
61822ab5 TM |
1463 | if (ret < 0) |
1464 | goto out; | |
34901f70 | 1465 | ret = nfs_sync_mapping_wait(mapping, wbc, how); |
ed90ef51 TM |
1466 | if (ret < 0) |
1467 | goto out; | |
1468 | return 0; | |
61822ab5 | 1469 | out: |
e507d9eb | 1470 | __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
1c75950b TM |
1471 | return ret; |
1472 | } | |
1473 | ||
34901f70 TM |
1474 | /* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */ |
1475 | static int nfs_write_mapping(struct address_space *mapping, int how) | |
1476 | { | |
1477 | struct writeback_control wbc = { | |
1478 | .bdi = mapping->backing_dev_info, | |
72cb77f4 | 1479 | .sync_mode = WB_SYNC_ALL, |
34901f70 | 1480 | .nr_to_write = LONG_MAX, |
d7fb1207 TM |
1481 | .range_start = 0, |
1482 | .range_end = LLONG_MAX, | |
34901f70 | 1483 | .for_writepages = 1, |
34901f70 | 1484 | }; |
34901f70 | 1485 | |
34901f70 TM |
1486 | return __nfs_write_mapping(mapping, &wbc, how); |
1487 | } | |
1488 | ||
ed90ef51 TM |
1489 | /* |
1490 | * flush the inode to disk. | |
1491 | */ | |
1492 | int nfs_wb_all(struct inode *inode) | |
1c75950b | 1493 | { |
ed90ef51 TM |
1494 | return nfs_write_mapping(inode->i_mapping, 0); |
1495 | } | |
1c75950b | 1496 | |
ed90ef51 TM |
1497 | int nfs_wb_nocommit(struct inode *inode) |
1498 | { | |
1499 | return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT); | |
1c75950b TM |
1500 | } |
1501 | ||
1b3b4a1a TM |
1502 | int nfs_wb_page_cancel(struct inode *inode, struct page *page) |
1503 | { | |
1504 | struct nfs_page *req; | |
1505 | loff_t range_start = page_offset(page); | |
1506 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
1507 | struct writeback_control wbc = { | |
1508 | .bdi = page->mapping->backing_dev_info, | |
1509 | .sync_mode = WB_SYNC_ALL, | |
1510 | .nr_to_write = LONG_MAX, | |
1511 | .range_start = range_start, | |
1512 | .range_end = range_end, | |
1513 | }; | |
1514 | int ret = 0; | |
1515 | ||
1516 | BUG_ON(!PageLocked(page)); | |
1517 | for (;;) { | |
1518 | req = nfs_page_find_request(page); | |
1519 | if (req == NULL) | |
1520 | goto out; | |
e468bae9 | 1521 | if (test_bit(PG_CLEAN, &req->wb_flags)) { |
1b3b4a1a TM |
1522 | nfs_release_request(req); |
1523 | break; | |
1524 | } | |
1525 | if (nfs_lock_request_dontget(req)) { | |
1526 | nfs_inode_remove_request(req); | |
1527 | /* | |
1528 | * In case nfs_inode_remove_request has marked the | |
1529 | * page as being dirty | |
1530 | */ | |
1531 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
1532 | nfs_unlock_request(req); | |
1533 | break; | |
1534 | } | |
1535 | ret = nfs_wait_on_request(req); | |
1536 | if (ret < 0) | |
1537 | goto out; | |
1538 | } | |
1539 | if (!PagePrivate(page)) | |
1540 | return 0; | |
1541 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE); | |
1542 | out: | |
1543 | return ret; | |
1544 | } | |
1545 | ||
5334eb13 AB |
1546 | static int nfs_wb_page_priority(struct inode *inode, struct page *page, |
1547 | int how) | |
1c75950b TM |
1548 | { |
1549 | loff_t range_start = page_offset(page); | |
1550 | loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1); | |
4d770ccf TM |
1551 | struct writeback_control wbc = { |
1552 | .bdi = page->mapping->backing_dev_info, | |
1553 | .sync_mode = WB_SYNC_ALL, | |
1554 | .nr_to_write = LONG_MAX, | |
1555 | .range_start = range_start, | |
1556 | .range_end = range_end, | |
1557 | }; | |
1558 | int ret; | |
1c75950b | 1559 | |
73e3302f TM |
1560 | do { |
1561 | if (clear_page_dirty_for_io(page)) { | |
1562 | ret = nfs_writepage_locked(page, &wbc); | |
1563 | if (ret < 0) | |
1564 | goto out_error; | |
1565 | } else if (!PagePrivate(page)) | |
1566 | break; | |
1567 | ret = nfs_sync_mapping_wait(page->mapping, &wbc, how); | |
4d770ccf | 1568 | if (ret < 0) |
73e3302f TM |
1569 | goto out_error; |
1570 | } while (PagePrivate(page)); | |
1571 | return 0; | |
1572 | out_error: | |
e507d9eb | 1573 | __mark_inode_dirty(inode, I_DIRTY_PAGES); |
4d770ccf | 1574 | return ret; |
1c75950b TM |
1575 | } |
1576 | ||
1577 | /* | |
1578 | * Write back all requests on one page - we do this before reading it. | |
1579 | */ | |
1580 | int nfs_wb_page(struct inode *inode, struct page* page) | |
1581 | { | |
4d770ccf | 1582 | return nfs_wb_page_priority(inode, page, FLUSH_STABLE); |
1c75950b TM |
1583 | } |
1584 | ||
f7b422b1 | 1585 | int __init nfs_init_writepagecache(void) |
1da177e4 LT |
1586 | { |
1587 | nfs_wdata_cachep = kmem_cache_create("nfs_write_data", | |
1588 | sizeof(struct nfs_write_data), | |
1589 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1590 | NULL); |
1da177e4 LT |
1591 | if (nfs_wdata_cachep == NULL) |
1592 | return -ENOMEM; | |
1593 | ||
93d2341c MD |
1594 | nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE, |
1595 | nfs_wdata_cachep); | |
1da177e4 LT |
1596 | if (nfs_wdata_mempool == NULL) |
1597 | return -ENOMEM; | |
1598 | ||
93d2341c MD |
1599 | nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT, |
1600 | nfs_wdata_cachep); | |
1da177e4 LT |
1601 | if (nfs_commit_mempool == NULL) |
1602 | return -ENOMEM; | |
1603 | ||
89a09141 PZ |
1604 | /* |
1605 | * NFS congestion size, scale with available memory. | |
1606 | * | |
1607 | * 64MB: 8192k | |
1608 | * 128MB: 11585k | |
1609 | * 256MB: 16384k | |
1610 | * 512MB: 23170k | |
1611 | * 1GB: 32768k | |
1612 | * 2GB: 46340k | |
1613 | * 4GB: 65536k | |
1614 | * 8GB: 92681k | |
1615 | * 16GB: 131072k | |
1616 | * | |
1617 | * This allows larger machines to have larger/more transfers. | |
1618 | * Limit the default to 256M | |
1619 | */ | |
1620 | nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); | |
1621 | if (nfs_congestion_kb > 256*1024) | |
1622 | nfs_congestion_kb = 256*1024; | |
1623 | ||
1da177e4 LT |
1624 | return 0; |
1625 | } | |
1626 | ||
266bee88 | 1627 | void nfs_destroy_writepagecache(void) |
1da177e4 LT |
1628 | { |
1629 | mempool_destroy(nfs_commit_mempool); | |
1630 | mempool_destroy(nfs_wdata_mempool); | |
1a1d92c1 | 1631 | kmem_cache_destroy(nfs_wdata_cachep); |
1da177e4 LT |
1632 | } |
1633 |