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NFS: Define nfs_direct_write_schedule_work() when v3 and v4 are disabled
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CommitLineData
1da177e4
LT
1/*
2 * linux/fs/nfs/write.c
3 *
7c85d900 4 * Write file data over NFS.
1da177e4
LT
5 *
6 * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
7 */
8
1da177e4
LT
9#include <linux/types.h>
10#include <linux/slab.h>
11#include <linux/mm.h>
12#include <linux/pagemap.h>
13#include <linux/file.h>
1da177e4 14#include <linux/writeback.h>
89a09141 15#include <linux/swap.h>
074cc1de 16#include <linux/migrate.h>
1da177e4
LT
17
18#include <linux/sunrpc/clnt.h>
19#include <linux/nfs_fs.h>
20#include <linux/nfs_mount.h>
21#include <linux/nfs_page.h>
3fcfab16 22#include <linux/backing-dev.h>
afeacc8c 23#include <linux/export.h>
3fcfab16 24
1da177e4 25#include <asm/uaccess.h>
1da177e4
LT
26
27#include "delegation.h"
49a70f27 28#include "internal.h"
91d5b470 29#include "iostat.h"
def6ed7e 30#include "nfs4_fs.h"
074cc1de 31#include "fscache.h"
94ad1c80 32#include "pnfs.h"
1da177e4
LT
33
34#define NFSDBG_FACILITY NFSDBG_PAGECACHE
35
36#define MIN_POOL_WRITE (32)
37#define MIN_POOL_COMMIT (4)
38
39/*
40 * Local function declarations
41 */
f8512ad0 42static void nfs_redirty_request(struct nfs_page *req);
6c75dc0d 43static const struct rpc_call_ops nfs_write_common_ops;
788e7a89 44static const struct rpc_call_ops nfs_commit_ops;
061ae2ed 45static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;
f453a54a 46static const struct nfs_commit_completion_ops nfs_commit_completion_ops;
1da177e4 47
e18b890b 48static struct kmem_cache *nfs_wdata_cachep;
3feb2d49 49static mempool_t *nfs_wdata_mempool;
0b7c0153 50static struct kmem_cache *nfs_cdata_cachep;
1da177e4
LT
51static mempool_t *nfs_commit_mempool;
52
0b7c0153 53struct nfs_commit_data *nfs_commitdata_alloc(void)
1da177e4 54{
0b7c0153 55 struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS);
40859d7e 56
1da177e4
LT
57 if (p) {
58 memset(p, 0, sizeof(*p));
59 INIT_LIST_HEAD(&p->pages);
60 }
61 return p;
62}
e0c2b380 63EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
1da177e4 64
0b7c0153 65void nfs_commit_free(struct nfs_commit_data *p)
1da177e4
LT
66{
67 mempool_free(p, nfs_commit_mempool);
68}
e0c2b380 69EXPORT_SYMBOL_GPL(nfs_commit_free);
1da177e4 70
6c75dc0d 71struct nfs_write_header *nfs_writehdr_alloc(void)
3feb2d49 72{
cd841605 73 struct nfs_write_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS);
3feb2d49
TM
74
75 if (p) {
cd841605 76 struct nfs_pgio_header *hdr = &p->header;
cd841605 77
3feb2d49 78 memset(p, 0, sizeof(*p));
cd841605 79 INIT_LIST_HEAD(&hdr->pages);
6c75dc0d
FI
80 INIT_LIST_HEAD(&hdr->rpc_list);
81 spin_lock_init(&hdr->lock);
82 atomic_set(&hdr->refcnt, 0);
3feb2d49
TM
83 }
84 return p;
85}
86
1763da12
FI
87static struct nfs_write_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr,
88 unsigned int pagecount)
6c75dc0d
FI
89{
90 struct nfs_write_data *data, *prealloc;
91
92 prealloc = &container_of(hdr, struct nfs_write_header, header)->rpc_data;
93 if (prealloc->header == NULL)
94 data = prealloc;
95 else
96 data = kzalloc(sizeof(*data), GFP_KERNEL);
97 if (!data)
98 goto out;
99
100 if (nfs_pgarray_set(&data->pages, pagecount)) {
101 data->header = hdr;
102 atomic_inc(&hdr->refcnt);
103 } else {
104 if (data != prealloc)
105 kfree(data);
106 data = NULL;
107 }
108out:
109 return data;
110}
111
cd841605 112void nfs_writehdr_free(struct nfs_pgio_header *hdr)
3feb2d49 113{
cd841605
FI
114 struct nfs_write_header *whdr = container_of(hdr, struct nfs_write_header, header);
115 mempool_free(whdr, nfs_wdata_mempool);
3feb2d49
TM
116}
117
dce81290 118void nfs_writedata_release(struct nfs_write_data *wdata)
1da177e4 119{
6c75dc0d
FI
120 struct nfs_pgio_header *hdr = wdata->header;
121 struct nfs_write_header *write_header = container_of(hdr, struct nfs_write_header, header);
122
383ba719 123 put_nfs_open_context(wdata->args.context);
30dd374f
FI
124 if (wdata->pages.pagevec != wdata->pages.page_array)
125 kfree(wdata->pages.pagevec);
6c75dc0d
FI
126 if (wdata != &write_header->rpc_data)
127 kfree(wdata);
128 else
129 wdata->header = NULL;
130 if (atomic_dec_and_test(&hdr->refcnt))
061ae2ed 131 hdr->completion_ops->completion(hdr);
1da177e4
LT
132}
133
7b159fc1
TM
134static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
135{
136 ctx->error = error;
137 smp_wmb();
138 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
139}
140
277459d2
TM
141static struct nfs_page *nfs_page_find_request_locked(struct page *page)
142{
143 struct nfs_page *req = NULL;
144
145 if (PagePrivate(page)) {
146 req = (struct nfs_page *)page_private(page);
147 if (req != NULL)
c03b4024 148 kref_get(&req->wb_kref);
277459d2
TM
149 }
150 return req;
151}
152
153static struct nfs_page *nfs_page_find_request(struct page *page)
154{
587142f8 155 struct inode *inode = page->mapping->host;
277459d2 156 struct nfs_page *req = NULL;
277459d2 157
587142f8 158 spin_lock(&inode->i_lock);
277459d2 159 req = nfs_page_find_request_locked(page);
587142f8 160 spin_unlock(&inode->i_lock);
277459d2
TM
161 return req;
162}
163
1da177e4
LT
164/* Adjust the file length if we're writing beyond the end */
165static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
166{
167 struct inode *inode = page->mapping->host;
a3d01454
TM
168 loff_t end, i_size;
169 pgoff_t end_index;
1da177e4 170
a3d01454
TM
171 spin_lock(&inode->i_lock);
172 i_size = i_size_read(inode);
173 end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
1da177e4 174 if (i_size > 0 && page->index < end_index)
a3d01454 175 goto out;
1da177e4
LT
176 end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
177 if (i_size >= end)
a3d01454 178 goto out;
1da177e4 179 i_size_write(inode, end);
a3d01454
TM
180 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
181out:
182 spin_unlock(&inode->i_lock);
1da177e4
LT
183}
184
a301b777
TM
185/* A writeback failed: mark the page as bad, and invalidate the page cache */
186static void nfs_set_pageerror(struct page *page)
187{
188 SetPageError(page);
189 nfs_zap_mapping(page->mapping->host, page->mapping);
190}
191
1da177e4
LT
192/* We can set the PG_uptodate flag if we see that a write request
193 * covers the full page.
194 */
195static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
196{
1da177e4
LT
197 if (PageUptodate(page))
198 return;
199 if (base != 0)
200 return;
49a70f27 201 if (count != nfs_page_length(page))
1da177e4 202 return;
49a70f27 203 SetPageUptodate(page);
1da177e4
LT
204}
205
1da177e4
LT
206static int wb_priority(struct writeback_control *wbc)
207{
208 if (wbc->for_reclaim)
c63c7b05 209 return FLUSH_HIGHPRI | FLUSH_STABLE;
b17621fe 210 if (wbc->for_kupdate || wbc->for_background)
b31268ac
TM
211 return FLUSH_LOWPRI | FLUSH_COND_STABLE;
212 return FLUSH_COND_STABLE;
1da177e4
LT
213}
214
89a09141
PZ
215/*
216 * NFS congestion control
217 */
218
219int nfs_congestion_kb;
220
221#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
222#define NFS_CONGESTION_OFF_THRESH \
223 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
224
5a6d41b3 225static int nfs_set_page_writeback(struct page *page)
89a09141 226{
5a6d41b3
TM
227 int ret = test_set_page_writeback(page);
228
229 if (!ret) {
89a09141
PZ
230 struct inode *inode = page->mapping->host;
231 struct nfs_server *nfss = NFS_SERVER(inode);
232
a6305ddb 233 page_cache_get(page);
277866a0 234 if (atomic_long_inc_return(&nfss->writeback) >
8aa7e847
JA
235 NFS_CONGESTION_ON_THRESH) {
236 set_bdi_congested(&nfss->backing_dev_info,
237 BLK_RW_ASYNC);
238 }
89a09141 239 }
5a6d41b3 240 return ret;
89a09141
PZ
241}
242
243static void nfs_end_page_writeback(struct page *page)
244{
245 struct inode *inode = page->mapping->host;
246 struct nfs_server *nfss = NFS_SERVER(inode);
247
248 end_page_writeback(page);
a6305ddb 249 page_cache_release(page);
c4dc4bee 250 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
8aa7e847 251 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
89a09141
PZ
252}
253
cfb506e1 254static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
e261f51f 255{
587142f8 256 struct inode *inode = page->mapping->host;
e261f51f 257 struct nfs_page *req;
e261f51f
TM
258 int ret;
259
587142f8 260 spin_lock(&inode->i_lock);
074cc1de 261 for (;;) {
e261f51f 262 req = nfs_page_find_request_locked(page);
074cc1de
TM
263 if (req == NULL)
264 break;
9994b62b 265 if (nfs_lock_request_dontget(req))
e261f51f
TM
266 break;
267 /* Note: If we hold the page lock, as is the case in nfs_writepage,
9994b62b 268 * then the call to nfs_lock_request_dontget() will always
e261f51f
TM
269 * succeed provided that someone hasn't already marked the
270 * request as dirty (in which case we don't care).
271 */
587142f8 272 spin_unlock(&inode->i_lock);
cfb506e1
TM
273 if (!nonblock)
274 ret = nfs_wait_on_request(req);
275 else
276 ret = -EAGAIN;
e261f51f
TM
277 nfs_release_request(req);
278 if (ret != 0)
074cc1de 279 return ERR_PTR(ret);
587142f8 280 spin_lock(&inode->i_lock);
e261f51f 281 }
587142f8 282 spin_unlock(&inode->i_lock);
074cc1de
TM
283 return req;
284}
285
286/*
287 * Find an associated nfs write request, and prepare to flush it out
288 * May return an error if the user signalled nfs_wait_on_request().
289 */
290static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
cfb506e1 291 struct page *page, bool nonblock)
074cc1de
TM
292{
293 struct nfs_page *req;
294 int ret = 0;
295
cfb506e1 296 req = nfs_find_and_lock_request(page, nonblock);
074cc1de
TM
297 if (!req)
298 goto out;
299 ret = PTR_ERR(req);
300 if (IS_ERR(req))
301 goto out;
302
303 ret = nfs_set_page_writeback(page);
304 BUG_ON(ret != 0);
305 BUG_ON(test_bit(PG_CLEAN, &req->wb_flags));
306
f8512ad0
FI
307 if (!nfs_pageio_add_request(pgio, req)) {
308 nfs_redirty_request(req);
074cc1de 309 ret = pgio->pg_error;
f8512ad0 310 }
074cc1de
TM
311out:
312 return ret;
e261f51f
TM
313}
314
f758c885 315static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
1da177e4 316{
1da177e4 317 struct inode *inode = page->mapping->host;
cfb506e1 318 int ret;
1da177e4 319
91d5b470
CL
320 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
321 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
322
7fe7f848 323 nfs_pageio_cond_complete(pgio, page->index);
1b430bee 324 ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
cfb506e1
TM
325 if (ret == -EAGAIN) {
326 redirty_page_for_writepage(wbc, page);
327 ret = 0;
328 }
329 return ret;
f758c885 330}
7fe7f848 331
f758c885
TM
332/*
333 * Write an mmapped page to the server.
334 */
335static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
336{
337 struct nfs_pageio_descriptor pgio;
338 int err;
49a70f27 339
061ae2ed
FI
340 nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc),
341 &nfs_async_write_completion_ops);
f758c885
TM
342 err = nfs_do_writepage(page, wbc, &pgio);
343 nfs_pageio_complete(&pgio);
344 if (err < 0)
345 return err;
346 if (pgio.pg_error < 0)
347 return pgio.pg_error;
348 return 0;
4d770ccf
TM
349}
350
351int nfs_writepage(struct page *page, struct writeback_control *wbc)
352{
f758c885 353 int ret;
4d770ccf 354
f758c885 355 ret = nfs_writepage_locked(page, wbc);
1da177e4 356 unlock_page(page);
f758c885
TM
357 return ret;
358}
359
360static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
361{
362 int ret;
363
364 ret = nfs_do_writepage(page, wbc, data);
365 unlock_page(page);
366 return ret;
1da177e4
LT
367}
368
1da177e4
LT
369int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
370{
1da177e4 371 struct inode *inode = mapping->host;
72cb77f4 372 unsigned long *bitlock = &NFS_I(inode)->flags;
c63c7b05 373 struct nfs_pageio_descriptor pgio;
1da177e4
LT
374 int err;
375
72cb77f4
TM
376 /* Stop dirtying of new pages while we sync */
377 err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
378 nfs_wait_bit_killable, TASK_KILLABLE);
379 if (err)
380 goto out_err;
381
91d5b470
CL
382 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
383
061ae2ed
FI
384 nfs_pageio_init_write(&pgio, inode, wb_priority(wbc),
385 &nfs_async_write_completion_ops);
f758c885 386 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
c63c7b05 387 nfs_pageio_complete(&pgio);
72cb77f4
TM
388
389 clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
390 smp_mb__after_clear_bit();
391 wake_up_bit(bitlock, NFS_INO_FLUSHING);
392
f758c885 393 if (err < 0)
72cb77f4
TM
394 goto out_err;
395 err = pgio.pg_error;
396 if (err < 0)
397 goto out_err;
c63c7b05 398 return 0;
72cb77f4
TM
399out_err:
400 return err;
1da177e4
LT
401}
402
403/*
404 * Insert a write request into an inode
405 */
d6d6dc7c 406static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
1da177e4
LT
407{
408 struct nfs_inode *nfsi = NFS_I(inode);
e7d39069
TM
409
410 /* Lock the request! */
411 nfs_lock_request_dontget(req);
412
413 spin_lock(&inode->i_lock);
4d65c520 414 if (!nfsi->npages && nfs_have_delegation(inode, FMODE_WRITE))
a9a4a87a 415 inode->i_version++;
2df485a7 416 set_bit(PG_MAPPED, &req->wb_flags);
deb7d638 417 SetPagePrivate(req->wb_page);
277459d2 418 set_page_private(req->wb_page, (unsigned long)req);
1da177e4 419 nfsi->npages++;
c03b4024 420 kref_get(&req->wb_kref);
e7d39069 421 spin_unlock(&inode->i_lock);
1da177e4
LT
422}
423
424/*
89a09141 425 * Remove a write request from an inode
1da177e4
LT
426 */
427static void nfs_inode_remove_request(struct nfs_page *req)
428{
3d4ff43d 429 struct inode *inode = req->wb_context->dentry->d_inode;
1da177e4
LT
430 struct nfs_inode *nfsi = NFS_I(inode);
431
432 BUG_ON (!NFS_WBACK_BUSY(req));
433
587142f8 434 spin_lock(&inode->i_lock);
277459d2 435 set_page_private(req->wb_page, 0);
deb7d638 436 ClearPagePrivate(req->wb_page);
2df485a7 437 clear_bit(PG_MAPPED, &req->wb_flags);
1da177e4 438 nfsi->npages--;
4d65c520 439 spin_unlock(&inode->i_lock);
1da177e4
LT
440 nfs_release_request(req);
441}
442
61822ab5 443static void
6d884e8f 444nfs_mark_request_dirty(struct nfs_page *req)
61822ab5 445{
61822ab5
TM
446 __set_page_dirty_nobuffers(req->wb_page);
447}
448
1da177e4 449#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
8dd37758
TM
450/**
451 * nfs_request_add_commit_list - add request to a commit list
452 * @req: pointer to a struct nfs_page
ea2cf228
FI
453 * @dst: commit list head
454 * @cinfo: holds list lock and accounting info
8dd37758 455 *
ea2cf228 456 * This sets the PG_CLEAN bit, updates the cinfo count of
8dd37758
TM
457 * number of outstanding requests requiring a commit as well as
458 * the MM page stats.
459 *
ea2cf228 460 * The caller must _not_ hold the cinfo->lock, but must be
8dd37758 461 * holding the nfs_page lock.
1da177e4 462 */
8dd37758 463void
ea2cf228
FI
464nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
465 struct nfs_commit_info *cinfo)
1da177e4 466{
e468bae9 467 set_bit(PG_CLEAN, &(req)->wb_flags);
ea2cf228
FI
468 spin_lock(cinfo->lock);
469 nfs_list_add_request(req, dst);
470 cinfo->mds->ncommit++;
471 spin_unlock(cinfo->lock);
56f9cd68
FI
472 if (!cinfo->dreq) {
473 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
474 inc_bdi_stat(req->wb_page->mapping->backing_dev_info,
475 BDI_RECLAIMABLE);
476 __mark_inode_dirty(req->wb_context->dentry->d_inode,
477 I_DIRTY_DATASYNC);
478 }
1da177e4 479}
8dd37758
TM
480EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
481
482/**
483 * nfs_request_remove_commit_list - Remove request from a commit list
484 * @req: pointer to a nfs_page
ea2cf228 485 * @cinfo: holds list lock and accounting info
8dd37758 486 *
ea2cf228 487 * This clears the PG_CLEAN bit, and updates the cinfo's count of
8dd37758
TM
488 * number of outstanding requests requiring a commit
489 * It does not update the MM page stats.
490 *
ea2cf228 491 * The caller _must_ hold the cinfo->lock and the nfs_page lock.
8dd37758
TM
492 */
493void
ea2cf228
FI
494nfs_request_remove_commit_list(struct nfs_page *req,
495 struct nfs_commit_info *cinfo)
8dd37758 496{
8dd37758
TM
497 if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
498 return;
499 nfs_list_remove_request(req);
ea2cf228 500 cinfo->mds->ncommit--;
8dd37758
TM
501}
502EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);
503
ea2cf228
FI
504static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
505 struct inode *inode)
506{
507 cinfo->lock = &inode->i_lock;
508 cinfo->mds = &NFS_I(inode)->commit_info;
509 cinfo->ds = pnfs_get_ds_info(inode);
b359f9d0 510 cinfo->dreq = NULL;
f453a54a 511 cinfo->completion_ops = &nfs_commit_completion_ops;
ea2cf228
FI
512}
513
514void nfs_init_cinfo(struct nfs_commit_info *cinfo,
515 struct inode *inode,
516 struct nfs_direct_req *dreq)
517{
1763da12
FI
518 if (dreq)
519 nfs_init_cinfo_from_dreq(cinfo, dreq);
520 else
521 nfs_init_cinfo_from_inode(cinfo, inode);
ea2cf228
FI
522}
523EXPORT_SYMBOL_GPL(nfs_init_cinfo);
8dd37758
TM
524
525/*
526 * Add a request to the inode's commit list.
527 */
1763da12 528void
ea2cf228
FI
529nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
530 struct nfs_commit_info *cinfo)
8dd37758 531{
ea2cf228 532 if (pnfs_mark_request_commit(req, lseg, cinfo))
8dd37758 533 return;
ea2cf228 534 nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo);
8dd37758 535}
8e821cad 536
d6d6dc7c
FI
537static void
538nfs_clear_page_commit(struct page *page)
539{
540 dec_zone_page_state(page, NR_UNSTABLE_NFS);
541 dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE);
542}
543
8dd37758 544static void
e468bae9
TM
545nfs_clear_request_commit(struct nfs_page *req)
546{
8dd37758
TM
547 if (test_bit(PG_CLEAN, &req->wb_flags)) {
548 struct inode *inode = req->wb_context->dentry->d_inode;
ea2cf228 549 struct nfs_commit_info cinfo;
e468bae9 550
ea2cf228
FI
551 nfs_init_cinfo_from_inode(&cinfo, inode);
552 if (!pnfs_clear_request_commit(req, &cinfo)) {
553 spin_lock(cinfo.lock);
554 nfs_request_remove_commit_list(req, &cinfo);
555 spin_unlock(cinfo.lock);
8dd37758 556 }
d6d6dc7c 557 nfs_clear_page_commit(req->wb_page);
e468bae9 558 }
e468bae9
TM
559}
560
8e821cad
TM
561static inline
562int nfs_write_need_commit(struct nfs_write_data *data)
563{
465d5243 564 if (data->verf.committed == NFS_DATA_SYNC)
cd841605
FI
565 return data->header->lseg == NULL;
566 return data->verf.committed != NFS_FILE_SYNC;
8e821cad
TM
567}
568
8e821cad 569#else
1763da12 570void
ea2cf228
FI
571nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
572 struct nfs_commit_info *cinfo)
8e821cad
TM
573{
574}
575
8dd37758 576static void
e468bae9
TM
577nfs_clear_request_commit(struct nfs_page *req)
578{
e468bae9
TM
579}
580
8e821cad
TM
581static inline
582int nfs_write_need_commit(struct nfs_write_data *data)
583{
584 return 0;
585}
586
6c75dc0d
FI
587#endif
588
061ae2ed 589static void nfs_write_completion(struct nfs_pgio_header *hdr)
8e821cad 590{
ea2cf228 591 struct nfs_commit_info cinfo;
6c75dc0d
FI
592 unsigned long bytes = 0;
593
594 if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
595 goto out;
ea2cf228 596 nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
6c75dc0d
FI
597 while (!list_empty(&hdr->pages)) {
598 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
599 struct page *page = req->wb_page;
600
601 bytes += req->wb_bytes;
602 nfs_list_remove_request(req);
603 if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
604 (hdr->good_bytes < bytes)) {
605 nfs_set_pageerror(page);
606 nfs_context_set_write_error(req->wb_context, hdr->error);
607 goto remove_req;
608 }
609 if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) {
610 nfs_mark_request_dirty(req);
611 goto next;
612 }
613 if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) {
ea2cf228 614 nfs_mark_request_commit(req, hdr->lseg, &cinfo);
6c75dc0d
FI
615 goto next;
616 }
617remove_req:
618 nfs_inode_remove_request(req);
619next:
620 nfs_unlock_request(req);
621 nfs_end_page_writeback(page);
622 }
623out:
624 hdr->release(hdr);
8e821cad 625}
1da177e4 626
47c62564 627#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
ea2cf228
FI
628static unsigned long
629nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
fb8a1f11 630{
ea2cf228 631 return cinfo->mds->ncommit;
d6d6dc7c
FI
632}
633
ea2cf228 634/* cinfo->lock held by caller */
1763da12 635int
ea2cf228
FI
636nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
637 struct nfs_commit_info *cinfo, int max)
d6d6dc7c
FI
638{
639 struct nfs_page *req, *tmp;
640 int ret = 0;
641
642 list_for_each_entry_safe(req, tmp, src, wb_list) {
8dd37758
TM
643 if (!nfs_lock_request(req))
644 continue;
ea2cf228 645 if (cond_resched_lock(cinfo->lock))
3b3be88d 646 list_safe_reset_next(req, tmp, wb_list);
ea2cf228 647 nfs_request_remove_commit_list(req, cinfo);
8dd37758
TM
648 nfs_list_add_request(req, dst);
649 ret++;
1763da12 650 if ((ret == max) && !cinfo->dreq)
8dd37758 651 break;
d6d6dc7c
FI
652 }
653 return ret;
fb8a1f11
TM
654}
655
1da177e4
LT
656/*
657 * nfs_scan_commit - Scan an inode for commit requests
658 * @inode: NFS inode to scan
ea2cf228
FI
659 * @dst: mds destination list
660 * @cinfo: mds and ds lists of reqs ready to commit
1da177e4
LT
661 *
662 * Moves requests from the inode's 'commit' request list.
663 * The requests are *not* checked to ensure that they form a contiguous set.
664 */
1763da12 665int
ea2cf228
FI
666nfs_scan_commit(struct inode *inode, struct list_head *dst,
667 struct nfs_commit_info *cinfo)
1da177e4 668{
d6d6dc7c 669 int ret = 0;
fb8a1f11 670
ea2cf228
FI
671 spin_lock(cinfo->lock);
672 if (cinfo->mds->ncommit > 0) {
8dd37758 673 const int max = INT_MAX;
d6d6dc7c 674
ea2cf228
FI
675 ret = nfs_scan_commit_list(&cinfo->mds->list, dst,
676 cinfo, max);
677 ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
d6d6dc7c 678 }
ea2cf228 679 spin_unlock(cinfo->lock);
ff778d02 680 return ret;
1da177e4 681}
d6d6dc7c 682
c42de9dd 683#else
ea2cf228 684static unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
fb8a1f11
TM
685{
686 return 0;
687}
688
1763da12
FI
689int nfs_scan_commit(struct inode *inode, struct list_head *dst,
690 struct nfs_commit_info *cinfo)
c42de9dd
TM
691{
692 return 0;
693}
1da177e4
LT
694#endif
695
1da177e4 696/*
e7d39069
TM
697 * Search for an existing write request, and attempt to update
698 * it to reflect a new dirty region on a given page.
1da177e4 699 *
e7d39069
TM
700 * If the attempt fails, then the existing request is flushed out
701 * to disk.
1da177e4 702 */
e7d39069
TM
703static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
704 struct page *page,
705 unsigned int offset,
706 unsigned int bytes)
1da177e4 707{
e7d39069
TM
708 struct nfs_page *req;
709 unsigned int rqend;
710 unsigned int end;
711 int error;
712
713 if (!PagePrivate(page))
714 return NULL;
1da177e4
LT
715
716 end = offset + bytes;
e7d39069 717 spin_lock(&inode->i_lock);
1da177e4 718
1da177e4 719 for (;;) {
277459d2 720 req = nfs_page_find_request_locked(page);
e7d39069
TM
721 if (req == NULL)
722 goto out_unlock;
723
724 rqend = req->wb_offset + req->wb_bytes;
725 /*
726 * Tell the caller to flush out the request if
727 * the offsets are non-contiguous.
728 * Note: nfs_flush_incompatible() will already
729 * have flushed out requests having wrong owners.
730 */
e468bae9 731 if (offset > rqend
e7d39069
TM
732 || end < req->wb_offset)
733 goto out_flushme;
734
9994b62b 735 if (nfs_lock_request_dontget(req))
1da177e4 736 break;
1da177e4 737
e7d39069 738 /* The request is locked, so wait and then retry */
587142f8 739 spin_unlock(&inode->i_lock);
e7d39069
TM
740 error = nfs_wait_on_request(req);
741 nfs_release_request(req);
742 if (error != 0)
743 goto out_err;
744 spin_lock(&inode->i_lock);
1da177e4
LT
745 }
746
747 /* Okay, the request matches. Update the region */
748 if (offset < req->wb_offset) {
749 req->wb_offset = offset;
750 req->wb_pgbase = offset;
1da177e4 751 }
1da177e4
LT
752 if (end > rqend)
753 req->wb_bytes = end - req->wb_offset;
e7d39069
TM
754 else
755 req->wb_bytes = rqend - req->wb_offset;
756out_unlock:
757 spin_unlock(&inode->i_lock);
ca138f36
FI
758 if (req)
759 nfs_clear_request_commit(req);
e7d39069
TM
760 return req;
761out_flushme:
762 spin_unlock(&inode->i_lock);
763 nfs_release_request(req);
764 error = nfs_wb_page(inode, page);
765out_err:
766 return ERR_PTR(error);
767}
768
769/*
770 * Try to update an existing write request, or create one if there is none.
771 *
772 * Note: Should always be called with the Page Lock held to prevent races
773 * if we have to add a new request. Also assumes that the caller has
774 * already called nfs_flush_incompatible() if necessary.
775 */
776static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
777 struct page *page, unsigned int offset, unsigned int bytes)
778{
779 struct inode *inode = page->mapping->host;
780 struct nfs_page *req;
1da177e4 781
e7d39069
TM
782 req = nfs_try_to_update_request(inode, page, offset, bytes);
783 if (req != NULL)
784 goto out;
785 req = nfs_create_request(ctx, inode, page, offset, bytes);
786 if (IS_ERR(req))
787 goto out;
d6d6dc7c 788 nfs_inode_add_request(inode, req);
efc91ed0 789out:
61e930a9 790 return req;
1da177e4
LT
791}
792
e7d39069
TM
793static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
794 unsigned int offset, unsigned int count)
795{
796 struct nfs_page *req;
797
798 req = nfs_setup_write_request(ctx, page, offset, count);
799 if (IS_ERR(req))
800 return PTR_ERR(req);
801 /* Update file length */
802 nfs_grow_file(page, offset, count);
803 nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
a6305ddb 804 nfs_mark_request_dirty(req);
9994b62b 805 nfs_unlock_request(req);
e7d39069
TM
806 return 0;
807}
808
1da177e4
LT
809int nfs_flush_incompatible(struct file *file, struct page *page)
810{
cd3758e3 811 struct nfs_open_context *ctx = nfs_file_open_context(file);
1da177e4 812 struct nfs_page *req;
1a54533e 813 int do_flush, status;
1da177e4
LT
814 /*
815 * Look for a request corresponding to this page. If there
816 * is one, and it belongs to another file, we flush it out
817 * before we try to copy anything into the page. Do this
818 * due to the lack of an ACCESS-type call in NFSv2.
819 * Also do the same if we find a request from an existing
820 * dropped page.
821 */
1a54533e
TM
822 do {
823 req = nfs_page_find_request(page);
824 if (req == NULL)
825 return 0;
f11ac8db
TM
826 do_flush = req->wb_page != page || req->wb_context != ctx ||
827 req->wb_lock_context->lockowner != current->files ||
828 req->wb_lock_context->pid != current->tgid;
1da177e4 829 nfs_release_request(req);
1a54533e
TM
830 if (!do_flush)
831 return 0;
832 status = nfs_wb_page(page->mapping->host, page);
833 } while (status == 0);
834 return status;
1da177e4
LT
835}
836
5d47a356
TM
837/*
838 * If the page cache is marked as unsafe or invalid, then we can't rely on
839 * the PageUptodate() flag. In this case, we will need to turn off
840 * write optimisations that depend on the page contents being correct.
841 */
842static int nfs_write_pageuptodate(struct page *page, struct inode *inode)
843{
844 return PageUptodate(page) &&
845 !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA));
846}
847
1da177e4
LT
848/*
849 * Update and possibly write a cached page of an NFS file.
850 *
851 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
852 * things with a page scheduled for an RPC call (e.g. invalidate it).
853 */
854int nfs_updatepage(struct file *file, struct page *page,
855 unsigned int offset, unsigned int count)
856{
cd3758e3 857 struct nfs_open_context *ctx = nfs_file_open_context(file);
1da177e4 858 struct inode *inode = page->mapping->host;
1da177e4
LT
859 int status = 0;
860
91d5b470
CL
861 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
862
48186c7d 863 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
01cce933
JJS
864 file->f_path.dentry->d_parent->d_name.name,
865 file->f_path.dentry->d_name.name, count,
48186c7d 866 (long long)(page_offset(page) + offset));
1da177e4 867
1da177e4 868 /* If we're not using byte range locks, and we know the page
5d47a356
TM
869 * is up to date, it may be more efficient to extend the write
870 * to cover the entire page in order to avoid fragmentation
871 * inefficiencies.
1da177e4 872 */
5d47a356
TM
873 if (nfs_write_pageuptodate(page, inode) &&
874 inode->i_flock == NULL &&
6b2f3d1f 875 !(file->f_flags & O_DSYNC)) {
49a70f27 876 count = max(count + offset, nfs_page_length(page));
1da177e4 877 offset = 0;
1da177e4
LT
878 }
879
e21195a7 880 status = nfs_writepage_setup(ctx, page, offset, count);
03fa9e84
TM
881 if (status < 0)
882 nfs_set_pageerror(page);
59b7c05f
TM
883 else
884 __set_page_dirty_nobuffers(page);
1da177e4 885
48186c7d 886 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
1da177e4 887 status, (long long)i_size_read(inode));
1da177e4
LT
888 return status;
889}
890
3ff7576d 891static int flush_task_priority(int how)
1da177e4
LT
892{
893 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
894 case FLUSH_HIGHPRI:
895 return RPC_PRIORITY_HIGH;
896 case FLUSH_LOWPRI:
897 return RPC_PRIORITY_LOW;
898 }
899 return RPC_PRIORITY_NORMAL;
900}
901
c5996c4e
FI
902int nfs_initiate_write(struct rpc_clnt *clnt,
903 struct nfs_write_data *data,
d138d5d1
AA
904 const struct rpc_call_ops *call_ops,
905 int how)
1da177e4 906{
cd841605 907 struct inode *inode = data->header->inode;
3ff7576d 908 int priority = flush_task_priority(how);
07737691 909 struct rpc_task *task;
bdc7f021
TM
910 struct rpc_message msg = {
911 .rpc_argp = &data->args,
912 .rpc_resp = &data->res,
cd841605 913 .rpc_cred = data->header->cred,
bdc7f021 914 };
84115e1c 915 struct rpc_task_setup task_setup_data = {
d138d5d1 916 .rpc_client = clnt,
07737691 917 .task = &data->task,
bdc7f021 918 .rpc_message = &msg,
84115e1c
TM
919 .callback_ops = call_ops,
920 .callback_data = data,
101070ca 921 .workqueue = nfsiod_workqueue,
2c61be0a 922 .flags = RPC_TASK_ASYNC,
3ff7576d 923 .priority = priority,
84115e1c 924 };
2c61be0a 925 int ret = 0;
1da177e4 926
d138d5d1
AA
927 /* Set up the initial task struct. */
928 NFS_PROTO(inode)->write_setup(data, &msg);
929
930 dprintk("NFS: %5u initiated write call "
931 "(req %s/%lld, %u bytes @ offset %llu)\n",
932 data->task.tk_pid,
933 inode->i_sb->s_id,
934 (long long)NFS_FILEID(inode),
935 data->args.count,
936 (unsigned long long)data->args.offset);
937
938 task = rpc_run_task(&task_setup_data);
939 if (IS_ERR(task)) {
940 ret = PTR_ERR(task);
941 goto out;
942 }
943 if (how & FLUSH_SYNC) {
944 ret = rpc_wait_for_completion_task(task);
945 if (ret == 0)
946 ret = task->tk_status;
947 }
948 rpc_put_task(task);
949out:
950 return ret;
951}
a69aef14 952EXPORT_SYMBOL_GPL(nfs_initiate_write);
d138d5d1
AA
953
954/*
955 * Set up the argument/result storage required for the RPC call.
956 */
6c75dc0d 957static void nfs_write_rpcsetup(struct nfs_write_data *data,
d138d5d1 958 unsigned int count, unsigned int offset,
ea2cf228 959 int how, struct nfs_commit_info *cinfo)
d138d5d1 960{
6c75dc0d 961 struct nfs_page *req = data->header->req;
d138d5d1 962
1da177e4
LT
963 /* Set up the RPC argument and reply structs
964 * NB: take care not to mess about with data->commit et al. */
965
6c75dc0d 966 data->args.fh = NFS_FH(data->header->inode);
1da177e4 967 data->args.offset = req_offset(req) + offset;
2bea038c
BH
968 /* pnfs_set_layoutcommit needs this */
969 data->mds_offset = data->args.offset;
1da177e4 970 data->args.pgbase = req->wb_pgbase + offset;
30dd374f 971 data->args.pages = data->pages.pagevec;
1da177e4 972 data->args.count = count;
383ba719 973 data->args.context = get_nfs_open_context(req->wb_context);
f11ac8db 974 data->args.lock_context = req->wb_lock_context;
bdc7f021 975 data->args.stable = NFS_UNSTABLE;
87ed5eb4
TM
976 switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
977 case 0:
978 break;
979 case FLUSH_COND_STABLE:
ea2cf228 980 if (nfs_reqs_to_commit(cinfo))
87ed5eb4
TM
981 break;
982 default:
983 data->args.stable = NFS_FILE_SYNC;
bdc7f021 984 }
1da177e4
LT
985
986 data->res.fattr = &data->fattr;
987 data->res.count = count;
988 data->res.verf = &data->verf;
0e574af1 989 nfs_fattr_init(&data->fattr);
6e4efd56 990}
1da177e4 991
6e4efd56
TM
992static int nfs_do_write(struct nfs_write_data *data,
993 const struct rpc_call_ops *call_ops,
6e4efd56
TM
994 int how)
995{
cd841605 996 struct inode *inode = data->header->inode;
0382b744 997
c5996c4e 998 return nfs_initiate_write(NFS_CLIENT(inode), data, call_ops, how);
1da177e4
LT
999}
1000
275acaaf
TM
1001static int nfs_do_multiple_writes(struct list_head *head,
1002 const struct rpc_call_ops *call_ops,
275acaaf
TM
1003 int how)
1004{
1005 struct nfs_write_data *data;
1006 int ret = 0;
1007
1008 while (!list_empty(head)) {
1009 int ret2;
1010
6c75dc0d 1011 data = list_first_entry(head, struct nfs_write_data, list);
275acaaf
TM
1012 list_del_init(&data->list);
1013
dce81290 1014 ret2 = nfs_do_write(data, call_ops, how);
275acaaf
TM
1015 if (ret == 0)
1016 ret = ret2;
1017 }
1018 return ret;
1019}
1020
6d884e8f
F
1021/* If a nfs_flush_* function fails, it should remove reqs from @head and
1022 * call this on each, which will prepare them to be retried on next
1023 * writeback using standard nfs.
1024 */
1025static void nfs_redirty_request(struct nfs_page *req)
1026{
a6305ddb
TM
1027 struct page *page = req->wb_page;
1028
6d884e8f 1029 nfs_mark_request_dirty(req);
9994b62b 1030 nfs_unlock_request(req);
a6305ddb 1031 nfs_end_page_writeback(page);
6d884e8f
F
1032}
1033
061ae2ed 1034static void nfs_async_write_error(struct list_head *head)
6c75dc0d
FI
1035{
1036 struct nfs_page *req;
1037
1038 while (!list_empty(head)) {
1039 req = nfs_list_entry(head->next);
1040 nfs_list_remove_request(req);
1041 nfs_redirty_request(req);
1042 }
1043}
1044
061ae2ed
FI
1045static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
1046 .error_cleanup = nfs_async_write_error,
1047 .completion = nfs_write_completion,
1048};
1049
1da177e4
LT
1050/*
1051 * Generate multiple small requests to write out a single
1052 * contiguous dirty area on one page.
1053 */
6c75dc0d
FI
1054static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
1055 struct nfs_pgio_header *hdr)
1da177e4 1056{
6c75dc0d 1057 struct nfs_page *req = hdr->req;
1da177e4
LT
1058 struct page *page = req->wb_page;
1059 struct nfs_write_data *data;
d097971d 1060 size_t wsize = desc->pg_bsize, nbytes;
e9f7bee1 1061 unsigned int offset;
1da177e4 1062 int requests = 0;
dbae4c73 1063 int ret = 0;
ea2cf228 1064 struct nfs_commit_info cinfo;
1da177e4 1065
ea2cf228 1066 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
1da177e4 1067 nfs_list_remove_request(req);
6c75dc0d 1068 nfs_list_add_request(req, &hdr->pages);
1da177e4 1069
b31268ac 1070 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
ea2cf228 1071 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo) ||
b31268ac
TM
1072 desc->pg_count > wsize))
1073 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1074
1075
275acaaf 1076 offset = 0;
c76069bd 1077 nbytes = desc->pg_count;
e9f7bee1
TM
1078 do {
1079 size_t len = min(nbytes, wsize);
1080
6c75dc0d
FI
1081 data = nfs_writedata_alloc(hdr, 1);
1082 if (!data)
1da177e4 1083 goto out_bad;
30dd374f 1084 data->pages.pagevec[0] = page;
ea2cf228 1085 nfs_write_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo);
6c75dc0d 1086 list_add(&data->list, &hdr->rpc_list);
1da177e4 1087 requests++;
e9f7bee1 1088 nbytes -= len;
275acaaf 1089 offset += len;
e9f7bee1 1090 } while (nbytes != 0);
6c75dc0d 1091 desc->pg_rpc_callops = &nfs_write_common_ops;
dbae4c73 1092 return ret;
1da177e4
LT
1093
1094out_bad:
6c75dc0d
FI
1095 while (!list_empty(&hdr->rpc_list)) {
1096 data = list_first_entry(&hdr->rpc_list, struct nfs_write_data, list);
6e4efd56 1097 list_del(&data->list);
8ccd271f 1098 nfs_writedata_release(data);
1da177e4 1099 }
061ae2ed 1100 desc->pg_completion_ops->error_cleanup(&hdr->pages);
1da177e4
LT
1101 return -ENOMEM;
1102}
1103
1104/*
1105 * Create an RPC task for the given write request and kick it.
1106 * The page must have been locked by the caller.
1107 *
1108 * It may happen that the page we're passed is not marked dirty.
1109 * This is the case if nfs_updatepage detects a conflicting request
1110 * that has been written but not committed.
1111 */
6c75dc0d
FI
1112static int nfs_flush_one(struct nfs_pageio_descriptor *desc,
1113 struct nfs_pgio_header *hdr)
1da177e4
LT
1114{
1115 struct nfs_page *req;
1116 struct page **pages;
1117 struct nfs_write_data *data;
c76069bd 1118 struct list_head *head = &desc->pg_list;
3b609184 1119 int ret = 0;
ea2cf228 1120 struct nfs_commit_info cinfo;
1da177e4 1121
6c75dc0d
FI
1122 data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base,
1123 desc->pg_count));
1124 if (!data) {
061ae2ed 1125 desc->pg_completion_ops->error_cleanup(head);
44b83799
FI
1126 ret = -ENOMEM;
1127 goto out;
1128 }
6c75dc0d 1129
ea2cf228 1130 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
30dd374f 1131 pages = data->pages.pagevec;
1da177e4
LT
1132 while (!list_empty(head)) {
1133 req = nfs_list_entry(head->next);
1134 nfs_list_remove_request(req);
6c75dc0d 1135 nfs_list_add_request(req, &hdr->pages);
1da177e4 1136 *pages++ = req->wb_page;
1da177e4 1137 }
1da177e4 1138
b31268ac 1139 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
ea2cf228 1140 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
b31268ac
TM
1141 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1142
1da177e4 1143 /* Set up the argument struct */
ea2cf228 1144 nfs_write_rpcsetup(data, desc->pg_count, 0, desc->pg_ioflags, &cinfo);
6c75dc0d
FI
1145 list_add(&data->list, &hdr->rpc_list);
1146 desc->pg_rpc_callops = &nfs_write_common_ops;
44b83799 1147out:
44b83799 1148 return ret;
1da177e4
LT
1149}
1150
6c75dc0d
FI
1151int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
1152 struct nfs_pgio_header *hdr)
dce81290
TM
1153{
1154 if (desc->pg_bsize < PAGE_CACHE_SIZE)
6c75dc0d
FI
1155 return nfs_flush_multi(desc, hdr);
1156 return nfs_flush_one(desc, hdr);
dce81290
TM
1157}
1158
1159static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
1751c363 1160{
6c75dc0d
FI
1161 struct nfs_write_header *whdr;
1162 struct nfs_pgio_header *hdr;
275acaaf
TM
1163 int ret;
1164
6c75dc0d
FI
1165 whdr = nfs_writehdr_alloc();
1166 if (!whdr) {
9b5415b5 1167 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
6c75dc0d
FI
1168 return -ENOMEM;
1169 }
1170 hdr = &whdr->header;
1171 nfs_pgheader_init(desc, hdr, nfs_writehdr_free);
1172 atomic_inc(&hdr->refcnt);
1173 ret = nfs_generic_flush(desc, hdr);
50828d7e 1174 if (ret == 0)
6c75dc0d
FI
1175 ret = nfs_do_multiple_writes(&hdr->rpc_list,
1176 desc->pg_rpc_callops,
1177 desc->pg_ioflags);
1178 else
1179 set_bit(NFS_IOHDR_REDO, &hdr->flags);
1180 if (atomic_dec_and_test(&hdr->refcnt))
061ae2ed 1181 hdr->completion_ops->completion(hdr);
275acaaf 1182 return ret;
1751c363 1183}
1751c363
TM
1184
1185static const struct nfs_pageio_ops nfs_pageio_write_ops = {
1186 .pg_test = nfs_generic_pg_test,
1187 .pg_doio = nfs_generic_pg_writepages,
1188};
1189
e2fecb21 1190void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
061ae2ed
FI
1191 struct inode *inode, int ioflags,
1192 const struct nfs_pgio_completion_ops *compl_ops)
1da177e4 1193{
061ae2ed 1194 nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops,
1751c363
TM
1195 NFS_SERVER(inode)->wsize, ioflags);
1196}
1da177e4 1197
dce81290
TM
1198void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
1199{
1200 pgio->pg_ops = &nfs_pageio_write_ops;
1201 pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
1202}
1f945357 1203EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
dce81290 1204
1763da12
FI
1205void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
1206 struct inode *inode, int ioflags,
1207 const struct nfs_pgio_completion_ops *compl_ops)
1751c363 1208{
061ae2ed
FI
1209 if (!pnfs_pageio_init_write(pgio, inode, ioflags, compl_ops))
1210 nfs_pageio_init_write_mds(pgio, inode, ioflags, compl_ops);
1da177e4
LT
1211}
1212
def6ed7e
AA
1213void nfs_write_prepare(struct rpc_task *task, void *calldata)
1214{
1215 struct nfs_write_data *data = calldata;
cd841605 1216 NFS_PROTO(data->header->inode)->write_rpc_prepare(task, data);
def6ed7e 1217}
def6ed7e 1218
0b7c0153
FI
1219void nfs_commit_prepare(struct rpc_task *task, void *calldata)
1220{
1221 struct nfs_commit_data *data = calldata;
1222
1223 NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
1224}
1225
1da177e4
LT
1226/*
1227 * Handle a write reply that flushes a whole page.
1228 *
1229 * FIXME: There is an inherent race with invalidate_inode_pages and
1230 * writebacks since the page->count is kept > 1 for as long
1231 * as the page has a write request pending.
1232 */
6c75dc0d 1233static void nfs_writeback_done_common(struct rpc_task *task, void *calldata)
1da177e4 1234{
788e7a89 1235 struct nfs_write_data *data = calldata;
1da177e4 1236
c9d8f89d
TM
1237 nfs_writeback_done(task, data);
1238}
1239
6c75dc0d 1240static void nfs_writeback_release_common(void *calldata)
c9d8f89d
TM
1241{
1242 struct nfs_write_data *data = calldata;
cd841605 1243 struct nfs_pgio_header *hdr = data->header;
e2fecb21 1244 int status = data->task.tk_status;
6c75dc0d 1245 struct nfs_page *req = hdr->req;
788e7a89 1246
6c75dc0d
FI
1247 if ((status >= 0) && nfs_write_need_commit(data)) {
1248 spin_lock(&hdr->lock);
1249 if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags))
1250 ; /* Do nothing */
1251 else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags))
8e821cad 1252 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
6c75dc0d
FI
1253 else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf)))
1254 set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags);
1255 spin_unlock(&hdr->lock);
1da177e4 1256 }
cd841605 1257 nfs_writedata_release(data);
1da177e4
LT
1258}
1259
6c75dc0d 1260static const struct rpc_call_ops nfs_write_common_ops = {
def6ed7e 1261 .rpc_call_prepare = nfs_write_prepare,
6c75dc0d
FI
1262 .rpc_call_done = nfs_writeback_done_common,
1263 .rpc_release = nfs_writeback_release_common,
788e7a89
TM
1264};
1265
1266
1da177e4
LT
1267/*
1268 * This function is called when the WRITE call is complete.
1269 */
13602896 1270void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
1da177e4 1271{
1da177e4
LT
1272 struct nfs_writeargs *argp = &data->args;
1273 struct nfs_writeres *resp = &data->res;
cd841605 1274 struct inode *inode = data->header->inode;
788e7a89 1275 int status;
1da177e4 1276
a3f565b1 1277 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
1da177e4
LT
1278 task->tk_pid, task->tk_status);
1279
f551e44f
CL
1280 /*
1281 * ->write_done will attempt to use post-op attributes to detect
1282 * conflicting writes by other clients. A strict interpretation
1283 * of close-to-open would allow us to continue caching even if
1284 * another writer had changed the file, but some applications
1285 * depend on tighter cache coherency when writing.
1286 */
cd841605 1287 status = NFS_PROTO(inode)->write_done(task, data);
788e7a89 1288 if (status != 0)
13602896 1289 return;
cd841605 1290 nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
91d5b470 1291
1da177e4
LT
1292#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1293 if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
1294 /* We tried a write call, but the server did not
1295 * commit data to stable storage even though we
1296 * requested it.
1297 * Note: There is a known bug in Tru64 < 5.0 in which
1298 * the server reports NFS_DATA_SYNC, but performs
1299 * NFS_FILE_SYNC. We therefore implement this checking
1300 * as a dprintk() in order to avoid filling syslog.
1301 */
1302 static unsigned long complain;
1303
a69aef14 1304 /* Note this will print the MDS for a DS write */
1da177e4 1305 if (time_before(complain, jiffies)) {
48186c7d 1306 dprintk("NFS: faulty NFS server %s:"
1da177e4 1307 " (committed = %d) != (stable = %d)\n",
cd841605 1308 NFS_SERVER(inode)->nfs_client->cl_hostname,
1da177e4
LT
1309 resp->verf->committed, argp->stable);
1310 complain = jiffies + 300 * HZ;
1311 }
1312 }
1313#endif
6c75dc0d
FI
1314 if (task->tk_status < 0)
1315 nfs_set_pgio_error(data->header, task->tk_status, argp->offset);
1316 else if (resp->count < argp->count) {
1da177e4
LT
1317 static unsigned long complain;
1318
6c75dc0d 1319 /* This a short write! */
cd841605 1320 nfs_inc_stats(inode, NFSIOS_SHORTWRITE);
91d5b470 1321
1da177e4 1322 /* Has the server at least made some progress? */
6c75dc0d
FI
1323 if (resp->count == 0) {
1324 if (time_before(complain, jiffies)) {
1325 printk(KERN_WARNING
1326 "NFS: Server wrote zero bytes, expected %u.\n",
1327 argp->count);
1328 complain = jiffies + 300 * HZ;
1da177e4 1329 }
6c75dc0d
FI
1330 nfs_set_pgio_error(data->header, -EIO, argp->offset);
1331 task->tk_status = -EIO;
13602896 1332 return;
1da177e4 1333 }
6c75dc0d
FI
1334 /* Was this an NFSv2 write or an NFSv3 stable write? */
1335 if (resp->verf->committed != NFS_UNSTABLE) {
1336 /* Resend from where the server left off */
1337 data->mds_offset += resp->count;
1338 argp->offset += resp->count;
1339 argp->pgbase += resp->count;
1340 argp->count -= resp->count;
1341 } else {
1342 /* Resend as a stable write in order to avoid
1343 * headaches in the case of a server crash.
1344 */
1345 argp->stable = NFS_FILE_SYNC;
1da177e4 1346 }
6c75dc0d 1347 rpc_restart_call_prepare(task);
1da177e4 1348 }
1da177e4
LT
1349}
1350
1351
1352#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
71d0a611
TM
1353static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
1354{
b8413f98
TM
1355 int ret;
1356
71d0a611
TM
1357 if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags))
1358 return 1;
b8413f98
TM
1359 if (!may_wait)
1360 return 0;
1361 ret = out_of_line_wait_on_bit_lock(&nfsi->flags,
1362 NFS_INO_COMMIT,
1363 nfs_wait_bit_killable,
1364 TASK_KILLABLE);
1365 return (ret < 0) ? ret : 1;
71d0a611
TM
1366}
1367
f453a54a 1368static void nfs_commit_clear_lock(struct nfs_inode *nfsi)
71d0a611
TM
1369{
1370 clear_bit(NFS_INO_COMMIT, &nfsi->flags);
1371 smp_mb__after_clear_bit();
1372 wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
1373}
1374
0b7c0153 1375void nfs_commitdata_release(struct nfs_commit_data *data)
1da177e4 1376{
0b7c0153
FI
1377 put_nfs_open_context(data->context);
1378 nfs_commit_free(data);
1da177e4 1379}
e0c2b380 1380EXPORT_SYMBOL_GPL(nfs_commitdata_release);
1da177e4 1381
0b7c0153 1382int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
9ace33cd
FI
1383 const struct rpc_call_ops *call_ops,
1384 int how)
1da177e4 1385{
07737691 1386 struct rpc_task *task;
9ace33cd 1387 int priority = flush_task_priority(how);
bdc7f021
TM
1388 struct rpc_message msg = {
1389 .rpc_argp = &data->args,
1390 .rpc_resp = &data->res,
9ace33cd 1391 .rpc_cred = data->cred,
bdc7f021 1392 };
84115e1c 1393 struct rpc_task_setup task_setup_data = {
07737691 1394 .task = &data->task,
9ace33cd 1395 .rpc_client = clnt,
bdc7f021 1396 .rpc_message = &msg,
9ace33cd 1397 .callback_ops = call_ops,
84115e1c 1398 .callback_data = data,
101070ca 1399 .workqueue = nfsiod_workqueue,
2c61be0a 1400 .flags = RPC_TASK_ASYNC,
3ff7576d 1401 .priority = priority,
84115e1c 1402 };
9ace33cd
FI
1403 /* Set up the initial task struct. */
1404 NFS_PROTO(data->inode)->commit_setup(data, &msg);
1405
1406 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
1407
1408 task = rpc_run_task(&task_setup_data);
1409 if (IS_ERR(task))
1410 return PTR_ERR(task);
1411 if (how & FLUSH_SYNC)
1412 rpc_wait_for_completion_task(task);
1413 rpc_put_task(task);
1414 return 0;
1415}
e0c2b380 1416EXPORT_SYMBOL_GPL(nfs_initiate_commit);
9ace33cd
FI
1417
1418/*
1419 * Set up the argument/result storage required for the RPC call.
1420 */
0b7c0153 1421void nfs_init_commit(struct nfs_commit_data *data,
f453a54a
FI
1422 struct list_head *head,
1423 struct pnfs_layout_segment *lseg,
1424 struct nfs_commit_info *cinfo)
9ace33cd
FI
1425{
1426 struct nfs_page *first = nfs_list_entry(head->next);
3d4ff43d 1427 struct inode *inode = first->wb_context->dentry->d_inode;
1da177e4
LT
1428
1429 /* Set up the RPC argument and reply structs
1430 * NB: take care not to mess about with data->commit et al. */
1431
1432 list_splice_init(head, &data->pages);
1da177e4 1433
1da177e4 1434 data->inode = inode;
9ace33cd 1435 data->cred = first->wb_context->cred;
988b6dce 1436 data->lseg = lseg; /* reference transferred */
9ace33cd 1437 data->mds_ops = &nfs_commit_ops;
f453a54a 1438 data->completion_ops = cinfo->completion_ops;
b359f9d0 1439 data->dreq = cinfo->dreq;
1da177e4
LT
1440
1441 data->args.fh = NFS_FH(data->inode);
3da28eb1
TM
1442 /* Note: we always request a commit of the entire inode */
1443 data->args.offset = 0;
1444 data->args.count = 0;
0b7c0153 1445 data->context = get_nfs_open_context(first->wb_context);
1da177e4
LT
1446 data->res.fattr = &data->fattr;
1447 data->res.verf = &data->verf;
0e574af1 1448 nfs_fattr_init(&data->fattr);
1da177e4 1449}
e0c2b380 1450EXPORT_SYMBOL_GPL(nfs_init_commit);
1da177e4 1451
e0c2b380 1452void nfs_retry_commit(struct list_head *page_list,
ea2cf228
FI
1453 struct pnfs_layout_segment *lseg,
1454 struct nfs_commit_info *cinfo)
64bfeb49
FI
1455{
1456 struct nfs_page *req;
1457
1458 while (!list_empty(page_list)) {
1459 req = nfs_list_entry(page_list->next);
1460 nfs_list_remove_request(req);
ea2cf228 1461 nfs_mark_request_commit(req, lseg, cinfo);
56f9cd68
FI
1462 if (!cinfo->dreq) {
1463 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
1464 dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
1465 BDI_RECLAIMABLE);
1466 }
9994b62b 1467 nfs_unlock_request(req);
64bfeb49
FI
1468 }
1469}
e0c2b380 1470EXPORT_SYMBOL_GPL(nfs_retry_commit);
64bfeb49 1471
1da177e4
LT
1472/*
1473 * Commit dirty pages
1474 */
1475static int
ea2cf228
FI
1476nfs_commit_list(struct inode *inode, struct list_head *head, int how,
1477 struct nfs_commit_info *cinfo)
1da177e4 1478{
0b7c0153 1479 struct nfs_commit_data *data;
1da177e4 1480
c9d8f89d 1481 data = nfs_commitdata_alloc();
1da177e4
LT
1482
1483 if (!data)
1484 goto out_bad;
1485
1486 /* Set up the argument struct */
f453a54a
FI
1487 nfs_init_commit(data, head, NULL, cinfo);
1488 atomic_inc(&cinfo->mds->rpcs_out);
0b7c0153 1489 return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops, how);
1da177e4 1490 out_bad:
ea2cf228 1491 nfs_retry_commit(head, NULL, cinfo);
f453a54a 1492 cinfo->completion_ops->error_cleanup(NFS_I(inode));
1da177e4
LT
1493 return -ENOMEM;
1494}
1495
1496/*
1497 * COMMIT call returned
1498 */
788e7a89 1499static void nfs_commit_done(struct rpc_task *task, void *calldata)
1da177e4 1500{
0b7c0153 1501 struct nfs_commit_data *data = calldata;
1da177e4 1502
a3f565b1 1503 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
1da177e4
LT
1504 task->tk_pid, task->tk_status);
1505
788e7a89 1506 /* Call the NFS version-specific code */
c0d0e96b 1507 NFS_PROTO(data->inode)->commit_done(task, data);
c9d8f89d
TM
1508}
1509
f453a54a 1510static void nfs_commit_release_pages(struct nfs_commit_data *data)
c9d8f89d 1511{
5917ce84 1512 struct nfs_page *req;
c9d8f89d 1513 int status = data->task.tk_status;
f453a54a 1514 struct nfs_commit_info cinfo;
788e7a89 1515
1da177e4
LT
1516 while (!list_empty(&data->pages)) {
1517 req = nfs_list_entry(data->pages.next);
1518 nfs_list_remove_request(req);
d6d6dc7c 1519 nfs_clear_page_commit(req->wb_page);
1da177e4 1520
48186c7d 1521 dprintk("NFS: commit (%s/%lld %d@%lld)",
3d4ff43d
AV
1522 req->wb_context->dentry->d_sb->s_id,
1523 (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
1da177e4
LT
1524 req->wb_bytes,
1525 (long long)req_offset(req));
c9d8f89d
TM
1526 if (status < 0) {
1527 nfs_context_set_write_error(req->wb_context, status);
1da177e4 1528 nfs_inode_remove_request(req);
c9d8f89d 1529 dprintk(", error = %d\n", status);
1da177e4
LT
1530 goto next;
1531 }
1532
1533 /* Okay, COMMIT succeeded, apparently. Check the verifier
1534 * returned by the server against all stored verfs. */
1535 if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) {
1536 /* We have a match */
1537 nfs_inode_remove_request(req);
1538 dprintk(" OK\n");
1539 goto next;
1540 }
1541 /* We have a mismatch. Write the page again */
1542 dprintk(" mismatch\n");
6d884e8f 1543 nfs_mark_request_dirty(req);
1da177e4 1544 next:
9994b62b 1545 nfs_unlock_request(req);
1da177e4 1546 }
f453a54a
FI
1547 nfs_init_cinfo(&cinfo, data->inode, data->dreq);
1548 if (atomic_dec_and_test(&cinfo.mds->rpcs_out))
1549 nfs_commit_clear_lock(NFS_I(data->inode));
5917ce84
FI
1550}
1551
1552static void nfs_commit_release(void *calldata)
1553{
0b7c0153 1554 struct nfs_commit_data *data = calldata;
5917ce84 1555
f453a54a 1556 data->completion_ops->completion(data);
c9d8f89d 1557 nfs_commitdata_release(calldata);
1da177e4 1558}
788e7a89
TM
1559
1560static const struct rpc_call_ops nfs_commit_ops = {
0b7c0153 1561 .rpc_call_prepare = nfs_commit_prepare,
788e7a89
TM
1562 .rpc_call_done = nfs_commit_done,
1563 .rpc_release = nfs_commit_release,
1564};
1da177e4 1565
f453a54a
FI
1566static const struct nfs_commit_completion_ops nfs_commit_completion_ops = {
1567 .completion = nfs_commit_release_pages,
1568 .error_cleanup = nfs_commit_clear_lock,
1569};
1570
1763da12
FI
1571int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
1572 int how, struct nfs_commit_info *cinfo)
84c53ab5
FI
1573{
1574 int status;
1575
ea2cf228 1576 status = pnfs_commit_list(inode, head, how, cinfo);
84c53ab5 1577 if (status == PNFS_NOT_ATTEMPTED)
ea2cf228 1578 status = nfs_commit_list(inode, head, how, cinfo);
84c53ab5
FI
1579 return status;
1580}
1581
b608b283 1582int nfs_commit_inode(struct inode *inode, int how)
1da177e4 1583{
1da177e4 1584 LIST_HEAD(head);
ea2cf228 1585 struct nfs_commit_info cinfo;
71d0a611 1586 int may_wait = how & FLUSH_SYNC;
b8413f98 1587 int res;
1da177e4 1588
b8413f98
TM
1589 res = nfs_commit_set_lock(NFS_I(inode), may_wait);
1590 if (res <= 0)
c5efa5fc 1591 goto out_mark_dirty;
ea2cf228
FI
1592 nfs_init_cinfo_from_inode(&cinfo, inode);
1593 res = nfs_scan_commit(inode, &head, &cinfo);
1da177e4 1594 if (res) {
a861a1e1
FI
1595 int error;
1596
ea2cf228 1597 error = nfs_generic_commit_list(inode, &head, how, &cinfo);
3da28eb1
TM
1598 if (error < 0)
1599 return error;
b8413f98 1600 if (!may_wait)
c5efa5fc 1601 goto out_mark_dirty;
b8413f98
TM
1602 error = wait_on_bit(&NFS_I(inode)->flags,
1603 NFS_INO_COMMIT,
1604 nfs_wait_bit_killable,
1605 TASK_KILLABLE);
1606 if (error < 0)
1607 return error;
71d0a611
TM
1608 } else
1609 nfs_commit_clear_lock(NFS_I(inode));
c5efa5fc
TM
1610 return res;
1611 /* Note: If we exit without ensuring that the commit is complete,
1612 * we must mark the inode as dirty. Otherwise, future calls to
1613 * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
1614 * that the data is on the disk.
1615 */
1616out_mark_dirty:
1617 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1da177e4
LT
1618 return res;
1619}
8fc795f7
TM
1620
1621static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1622{
420e3646
TM
1623 struct nfs_inode *nfsi = NFS_I(inode);
1624 int flags = FLUSH_SYNC;
1625 int ret = 0;
8fc795f7 1626
3236c3e1 1627 /* no commits means nothing needs to be done */
ea2cf228 1628 if (!nfsi->commit_info.ncommit)
3236c3e1
JL
1629 return ret;
1630
a00dd6c0
JL
1631 if (wbc->sync_mode == WB_SYNC_NONE) {
1632 /* Don't commit yet if this is a non-blocking flush and there
1633 * are a lot of outstanding writes for this mapping.
1634 */
ea2cf228 1635 if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1))
a00dd6c0 1636 goto out_mark_dirty;
420e3646 1637
a00dd6c0 1638 /* don't wait for the COMMIT response */
420e3646 1639 flags = 0;
a00dd6c0
JL
1640 }
1641
420e3646
TM
1642 ret = nfs_commit_inode(inode, flags);
1643 if (ret >= 0) {
1644 if (wbc->sync_mode == WB_SYNC_NONE) {
1645 if (ret < wbc->nr_to_write)
1646 wbc->nr_to_write -= ret;
1647 else
1648 wbc->nr_to_write = 0;
1649 }
8fc795f7 1650 return 0;
420e3646
TM
1651 }
1652out_mark_dirty:
8fc795f7
TM
1653 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1654 return ret;
1655}
c63c7b05 1656#else
8fc795f7
TM
1657static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1658{
1659 return 0;
1660}
1da177e4
LT
1661#endif
1662
8fc795f7
TM
1663int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1664{
863a3c6c
AA
1665 int ret;
1666
1667 ret = nfs_commit_unstable_pages(inode, wbc);
1668 if (ret >= 0 && test_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags)) {
ef311537
AA
1669 int status;
1670 bool sync = true;
863a3c6c 1671
846d5a09 1672 if (wbc->sync_mode == WB_SYNC_NONE)
ef311537 1673 sync = false;
863a3c6c
AA
1674
1675 status = pnfs_layoutcommit_inode(inode, sync);
1676 if (status < 0)
1677 return status;
1678 }
1679 return ret;
8fc795f7
TM
1680}
1681
acdc53b2
TM
1682/*
1683 * flush the inode to disk.
1684 */
1685int nfs_wb_all(struct inode *inode)
34901f70
TM
1686{
1687 struct writeback_control wbc = {
72cb77f4 1688 .sync_mode = WB_SYNC_ALL,
34901f70 1689 .nr_to_write = LONG_MAX,
d7fb1207
TM
1690 .range_start = 0,
1691 .range_end = LLONG_MAX,
34901f70 1692 };
34901f70 1693
acdc53b2 1694 return sync_inode(inode, &wbc);
1c75950b
TM
1695}
1696
1b3b4a1a
TM
1697int nfs_wb_page_cancel(struct inode *inode, struct page *page)
1698{
1699 struct nfs_page *req;
1b3b4a1a
TM
1700 int ret = 0;
1701
1702 BUG_ON(!PageLocked(page));
1703 for (;;) {
ba8b06e6 1704 wait_on_page_writeback(page);
1b3b4a1a
TM
1705 req = nfs_page_find_request(page);
1706 if (req == NULL)
1b3b4a1a 1707 break;
1b3b4a1a 1708 if (nfs_lock_request_dontget(req)) {
8dd37758 1709 nfs_clear_request_commit(req);
1b3b4a1a
TM
1710 nfs_inode_remove_request(req);
1711 /*
1712 * In case nfs_inode_remove_request has marked the
1713 * page as being dirty
1714 */
1715 cancel_dirty_page(page, PAGE_CACHE_SIZE);
1716 nfs_unlock_request(req);
1717 break;
1718 }
1719 ret = nfs_wait_on_request(req);
c9edda71 1720 nfs_release_request(req);
1b3b4a1a 1721 if (ret < 0)
c988950e 1722 break;
1b3b4a1a 1723 }
1b3b4a1a
TM
1724 return ret;
1725}
1726
7f2f12d9
TM
1727/*
1728 * Write back all requests on one page - we do this before reading it.
1729 */
1730int nfs_wb_page(struct inode *inode, struct page *page)
1c75950b
TM
1731{
1732 loff_t range_start = page_offset(page);
1733 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
4d770ccf 1734 struct writeback_control wbc = {
4d770ccf 1735 .sync_mode = WB_SYNC_ALL,
7f2f12d9 1736 .nr_to_write = 0,
4d770ccf
TM
1737 .range_start = range_start,
1738 .range_end = range_end,
1739 };
1740 int ret;
1c75950b 1741
0522f6ad 1742 for (;;) {
ba8b06e6 1743 wait_on_page_writeback(page);
73e3302f
TM
1744 if (clear_page_dirty_for_io(page)) {
1745 ret = nfs_writepage_locked(page, &wbc);
1746 if (ret < 0)
1747 goto out_error;
0522f6ad 1748 continue;
7f2f12d9 1749 }
0522f6ad
TM
1750 if (!PagePrivate(page))
1751 break;
1752 ret = nfs_commit_inode(inode, FLUSH_SYNC);
ba8b06e6 1753 if (ret < 0)
73e3302f 1754 goto out_error;
7f2f12d9 1755 }
73e3302f
TM
1756 return 0;
1757out_error:
4d770ccf 1758 return ret;
1c75950b
TM
1759}
1760
074cc1de
TM
1761#ifdef CONFIG_MIGRATION
1762int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
a6bc32b8 1763 struct page *page, enum migrate_mode mode)
074cc1de 1764{
2da95652
JL
1765 /*
1766 * If PagePrivate is set, then the page is currently associated with
1767 * an in-progress read or write request. Don't try to migrate it.
1768 *
1769 * FIXME: we could do this in principle, but we'll need a way to ensure
1770 * that we can safely release the inode reference while holding
1771 * the page lock.
1772 */
1773 if (PagePrivate(page))
1774 return -EBUSY;
074cc1de 1775
7549ad5f 1776 nfs_fscache_release_page(page, GFP_KERNEL);
074cc1de 1777
a6bc32b8 1778 return migrate_page(mapping, newpage, page, mode);
074cc1de
TM
1779}
1780#endif
1781
f7b422b1 1782int __init nfs_init_writepagecache(void)
1da177e4
LT
1783{
1784 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
cd841605 1785 sizeof(struct nfs_write_header),
1da177e4 1786 0, SLAB_HWCACHE_ALIGN,
20c2df83 1787 NULL);
1da177e4
LT
1788 if (nfs_wdata_cachep == NULL)
1789 return -ENOMEM;
1790
93d2341c
MD
1791 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1792 nfs_wdata_cachep);
1da177e4
LT
1793 if (nfs_wdata_mempool == NULL)
1794 return -ENOMEM;
1795
0b7c0153
FI
1796 nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
1797 sizeof(struct nfs_commit_data),
1798 0, SLAB_HWCACHE_ALIGN,
1799 NULL);
1800 if (nfs_cdata_cachep == NULL)
1801 return -ENOMEM;
1802
93d2341c
MD
1803 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
1804 nfs_wdata_cachep);
1da177e4
LT
1805 if (nfs_commit_mempool == NULL)
1806 return -ENOMEM;
1807
89a09141
PZ
1808 /*
1809 * NFS congestion size, scale with available memory.
1810 *
1811 * 64MB: 8192k
1812 * 128MB: 11585k
1813 * 256MB: 16384k
1814 * 512MB: 23170k
1815 * 1GB: 32768k
1816 * 2GB: 46340k
1817 * 4GB: 65536k
1818 * 8GB: 92681k
1819 * 16GB: 131072k
1820 *
1821 * This allows larger machines to have larger/more transfers.
1822 * Limit the default to 256M
1823 */
1824 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
1825 if (nfs_congestion_kb > 256*1024)
1826 nfs_congestion_kb = 256*1024;
1827
1da177e4
LT
1828 return 0;
1829}
1830
266bee88 1831void nfs_destroy_writepagecache(void)
1da177e4
LT
1832{
1833 mempool_destroy(nfs_commit_mempool);
1834 mempool_destroy(nfs_wdata_mempool);
1a1d92c1 1835 kmem_cache_destroy(nfs_wdata_cachep);
1da177e4
LT
1836}
1837