blob: dea17375eb30edf513e223d18cd86630029bad98 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/write.c
3 *
Trond Myklebust7c85d902006-12-13 15:23:48 -05004 * Write file data over NFS.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Copyright (C) 1996, 1997, Olaf Kirch <okir@monad.swb.de>
7 */
8
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/types.h>
10#include <linux/slab.h>
11#include <linux/mm.h>
12#include <linux/pagemap.h>
13#include <linux/file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/writeback.h>
15
16#include <linux/sunrpc/clnt.h>
17#include <linux/nfs_fs.h>
18#include <linux/nfs_mount.h>
19#include <linux/nfs_page.h>
Andrew Morton3fcfab12006-10-19 23:28:16 -070020#include <linux/backing-dev.h>
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <asm/uaccess.h>
23#include <linux/smp_lock.h>
24
25#include "delegation.h"
Trond Myklebust49a70f22006-12-05 00:35:38 -050026#include "internal.h"
Chuck Lever91d5b472006-03-20 13:44:14 -050027#include "iostat.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29#define NFSDBG_FACILITY NFSDBG_PAGECACHE
30
31#define MIN_POOL_WRITE (32)
32#define MIN_POOL_COMMIT (4)
33
34/*
35 * Local function declarations
36 */
37static struct nfs_page * nfs_update_request(struct nfs_open_context*,
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 struct page *,
39 unsigned int, unsigned int);
Trond Myklebuste261f512006-12-05 00:35:41 -050040static void nfs_mark_request_dirty(struct nfs_page *req);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041static int nfs_wait_on_write_congestion(struct address_space *, int);
Trond Myklebust3f442542006-09-17 14:46:44 -040042static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how);
Trond Myklebust788e7a82006-03-20 13:44:27 -050043static const struct rpc_call_ops nfs_write_partial_ops;
44static const struct rpc_call_ops nfs_write_full_ops;
45static const struct rpc_call_ops nfs_commit_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Christoph Lametere18b8902006-12-06 20:33:20 -080047static struct kmem_cache *nfs_wdata_cachep;
Trond Myklebust3feb2d42006-03-20 13:44:37 -050048static mempool_t *nfs_wdata_mempool;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049static mempool_t *nfs_commit_mempool;
50
51static DECLARE_WAIT_QUEUE_HEAD(nfs_write_congestion);
52
Trond Myklebuste9f7bee2006-09-08 09:48:54 -070053struct nfs_write_data *nfs_commit_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
Christoph Lametere6b4f8d2006-12-06 20:33:14 -080055 struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS);
Chuck Lever40859d72005-11-30 18:09:02 -050056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 if (p) {
58 memset(p, 0, sizeof(*p));
59 INIT_LIST_HEAD(&p->pages);
60 }
61 return p;
62}
63
Trond Myklebust8aca67f2006-11-13 16:23:44 -050064void nfs_commit_rcu_free(struct rcu_head *head)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
Trond Myklebust8aca67f2006-11-13 16:23:44 -050066 struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu);
Chuck Lever40859d72005-11-30 18:09:02 -050067 if (p && (p->pagevec != &p->page_array[0]))
68 kfree(p->pagevec);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 mempool_free(p, nfs_commit_mempool);
70}
71
Trond Myklebust8aca67f2006-11-13 16:23:44 -050072void nfs_commit_free(struct nfs_write_data *wdata)
73{
74 call_rcu_bh(&wdata->task.u.tk_rcu, nfs_commit_rcu_free);
75}
76
Trond Myklebuste9f7bee2006-09-08 09:48:54 -070077struct nfs_write_data *nfs_writedata_alloc(size_t len)
Trond Myklebust3feb2d42006-03-20 13:44:37 -050078{
Trond Myklebuste9f7bee2006-09-08 09:48:54 -070079 unsigned int pagecount = (len + PAGE_SIZE - 1) >> PAGE_SHIFT;
Christoph Lametere6b4f8d2006-12-06 20:33:14 -080080 struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS);
Trond Myklebust3feb2d42006-03-20 13:44:37 -050081
82 if (p) {
83 memset(p, 0, sizeof(*p));
84 INIT_LIST_HEAD(&p->pages);
Trond Myklebuste9f7bee2006-09-08 09:48:54 -070085 p->npages = pagecount;
Chuck Lever0d0b5cb2006-05-25 01:40:53 -040086 if (pagecount <= ARRAY_SIZE(p->page_array))
87 p->pagevec = p->page_array;
Trond Myklebust3feb2d42006-03-20 13:44:37 -050088 else {
Chuck Lever0d0b5cb2006-05-25 01:40:53 -040089 p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
90 if (!p->pagevec) {
Trond Myklebust3feb2d42006-03-20 13:44:37 -050091 mempool_free(p, nfs_wdata_mempool);
92 p = NULL;
93 }
94 }
95 }
96 return p;
97}
98
Trond Myklebust8aca67f2006-11-13 16:23:44 -050099static void nfs_writedata_rcu_free(struct rcu_head *head)
Trond Myklebust3feb2d42006-03-20 13:44:37 -0500100{
Trond Myklebust8aca67f2006-11-13 16:23:44 -0500101 struct nfs_write_data *p = container_of(head, struct nfs_write_data, task.u.tk_rcu);
Trond Myklebust3feb2d42006-03-20 13:44:37 -0500102 if (p && (p->pagevec != &p->page_array[0]))
103 kfree(p->pagevec);
104 mempool_free(p, nfs_wdata_mempool);
105}
106
Trond Myklebust8aca67f2006-11-13 16:23:44 -0500107static void nfs_writedata_free(struct nfs_write_data *wdata)
108{
109 call_rcu_bh(&wdata->task.u.tk_rcu, nfs_writedata_rcu_free);
110}
111
Trond Myklebust963d8fe2006-01-03 09:55:04 +0100112void nfs_writedata_release(void *wdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 nfs_writedata_free(wdata);
115}
116
Trond Myklebust277459d2006-12-05 00:35:35 -0500117static struct nfs_page *nfs_page_find_request_locked(struct page *page)
118{
119 struct nfs_page *req = NULL;
120
121 if (PagePrivate(page)) {
122 req = (struct nfs_page *)page_private(page);
123 if (req != NULL)
124 atomic_inc(&req->wb_count);
125 }
126 return req;
127}
128
129static struct nfs_page *nfs_page_find_request(struct page *page)
130{
131 struct nfs_page *req = NULL;
132 spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
133
134 spin_lock(req_lock);
135 req = nfs_page_find_request_locked(page);
136 spin_unlock(req_lock);
137 return req;
138}
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140/* Adjust the file length if we're writing beyond the end */
141static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
142{
143 struct inode *inode = page->mapping->host;
144 loff_t end, i_size = i_size_read(inode);
145 unsigned long end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
146
147 if (i_size > 0 && page->index < end_index)
148 return;
149 end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
150 if (i_size >= end)
151 return;
Chuck Lever91d5b472006-03-20 13:44:14 -0500152 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 i_size_write(inode, end);
154}
155
156/* We can set the PG_uptodate flag if we see that a write request
157 * covers the full page.
158 */
159static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
160{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (PageUptodate(page))
162 return;
163 if (base != 0)
164 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500165 if (count != nfs_page_length(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500167 if (count != PAGE_CACHE_SIZE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 memclear_highpage_flush(page, count, PAGE_CACHE_SIZE - count);
Trond Myklebust49a70f22006-12-05 00:35:38 -0500169 SetPageUptodate(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
Trond Myklebuste21195a2006-12-05 00:35:39 -0500172static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 unsigned int offset, unsigned int count)
174{
175 struct nfs_page *req;
Trond Myklebuste21195a2006-12-05 00:35:39 -0500176 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Trond Myklebuste21195a2006-12-05 00:35:39 -0500178 for (;;) {
179 req = nfs_update_request(ctx, page, offset, count);
180 if (!IS_ERR(req))
181 break;
182 ret = PTR_ERR(req);
183 if (ret != -EBUSY)
184 return ret;
185 ret = nfs_wb_page(page->mapping->host, page);
186 if (ret != 0)
187 return ret;
188 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 /* Update file length */
190 nfs_grow_file(page, offset, count);
191 /* Set the PG_uptodate flag? */
192 nfs_mark_uptodate(page, offset, count);
193 nfs_unlock_request(req);
Trond Myklebustabd3e642006-01-03 09:55:02 +0100194 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195}
196
197static int wb_priority(struct writeback_control *wbc)
198{
199 if (wbc->for_reclaim)
200 return FLUSH_HIGHPRI;
201 if (wbc->for_kupdate)
202 return FLUSH_LOWPRI;
203 return 0;
204}
205
206/*
Trond Myklebuste261f512006-12-05 00:35:41 -0500207 * Find an associated nfs write request, and prepare to flush it out
208 * Returns 1 if there was no write request, or if the request was
209 * already tagged by nfs_set_page_dirty.Returns 0 if the request
210 * was not tagged.
211 * May also return an error if the user signalled nfs_wait_on_request().
212 */
213static int nfs_page_mark_flush(struct page *page)
214{
215 struct nfs_page *req;
216 spinlock_t *req_lock = &NFS_I(page->mapping->host)->req_lock;
217 int ret;
218
219 spin_lock(req_lock);
220 for(;;) {
221 req = nfs_page_find_request_locked(page);
222 if (req == NULL) {
223 spin_unlock(req_lock);
224 return 1;
225 }
226 if (nfs_lock_request_dontget(req))
227 break;
228 /* Note: If we hold the page lock, as is the case in nfs_writepage,
229 * then the call to nfs_lock_request_dontget() will always
230 * succeed provided that someone hasn't already marked the
231 * request as dirty (in which case we don't care).
232 */
233 spin_unlock(req_lock);
234 ret = nfs_wait_on_request(req);
235 nfs_release_request(req);
236 if (ret != 0)
237 return ret;
238 spin_lock(req_lock);
239 }
240 spin_unlock(req_lock);
Trond Myklebust61822ab2006-12-05 00:35:42 -0500241 if (test_and_set_bit(PG_FLUSHING, &req->wb_flags) == 0) {
Trond Myklebuste261f512006-12-05 00:35:41 -0500242 nfs_mark_request_dirty(req);
Trond Myklebust61822ab2006-12-05 00:35:42 -0500243 set_page_writeback(page);
244 }
Trond Myklebuste261f512006-12-05 00:35:41 -0500245 ret = test_bit(PG_NEED_FLUSH, &req->wb_flags);
246 nfs_unlock_request(req);
247 return ret;
248}
249
250/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 * Write an mmapped page to the server.
252 */
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500253static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254{
255 struct nfs_open_context *ctx;
256 struct inode *inode = page->mapping->host;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500257 unsigned offset;
Trond Myklebuste261f512006-12-05 00:35:41 -0500258 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259
Chuck Lever91d5b472006-03-20 13:44:14 -0500260 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
261 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
262
Trond Myklebuste261f512006-12-05 00:35:41 -0500263 err = nfs_page_mark_flush(page);
264 if (err <= 0)
265 goto out;
266 err = 0;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500267 offset = nfs_page_length(page);
268 if (!offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 goto out;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500270
Trond Myklebustd5308382005-11-04 15:33:38 -0500271 ctx = nfs_find_open_context(inode, NULL, FMODE_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 if (ctx == NULL) {
273 err = -EBADF;
274 goto out;
275 }
Trond Myklebust200baa22006-12-05 00:35:40 -0500276 err = nfs_writepage_setup(ctx, page, 0, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 put_nfs_open_context(ctx);
Trond Myklebuste261f512006-12-05 00:35:41 -0500278 if (err != 0)
279 goto out;
280 err = nfs_page_mark_flush(page);
281 if (err > 0)
282 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283out:
Trond Myklebust200baa22006-12-05 00:35:40 -0500284 if (!wbc->for_writepages)
Trond Myklebust02241bc2007-01-13 02:28:07 -0500285 nfs_flush_mapping(page->mapping, wbc, FLUSH_STABLE|wb_priority(wbc));
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500286 return err;
287}
288
289int nfs_writepage(struct page *page, struct writeback_control *wbc)
290{
291 int err;
292
293 err = nfs_writepage_locked(page, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 unlock_page(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 return err;
296}
297
298/*
299 * Note: causes nfs_update_request() to block on the assumption
300 * that the writeback is generated due to memory pressure.
301 */
302int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
303{
304 struct backing_dev_info *bdi = mapping->backing_dev_info;
305 struct inode *inode = mapping->host;
306 int err;
307
Chuck Lever91d5b472006-03-20 13:44:14 -0500308 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 err = generic_writepages(mapping, wbc);
311 if (err)
312 return err;
313 while (test_and_set_bit(BDI_write_congested, &bdi->state) != 0) {
314 if (wbc->nonblocking)
315 return 0;
316 nfs_wait_on_write_congestion(mapping, 0);
317 }
Trond Myklebust28c69252006-09-16 13:04:50 -0400318 err = nfs_flush_mapping(mapping, wbc, wb_priority(wbc));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 if (err < 0)
320 goto out;
Chuck Lever91d5b472006-03-20 13:44:14 -0500321 nfs_add_stats(inode, NFSIOS_WRITEPAGES, err);
Trond Myklebustd30c8342006-12-13 15:23:47 -0500322 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323out:
324 clear_bit(BDI_write_congested, &bdi->state);
325 wake_up_all(&nfs_write_congestion);
Andrew Morton3fcfab12006-10-19 23:28:16 -0700326 congestion_end(WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 return err;
328}
329
330/*
331 * Insert a write request into an inode
332 */
333static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
334{
335 struct nfs_inode *nfsi = NFS_I(inode);
336 int error;
337
338 error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req);
339 BUG_ON(error == -EEXIST);
340 if (error)
341 return error;
342 if (!nfsi->npages) {
343 igrab(inode);
344 nfs_begin_data_update(inode);
345 if (nfs_have_delegation(inode, FMODE_WRITE))
346 nfsi->change_attr++;
347 }
Trond Myklebustdeb7d632006-03-20 13:44:50 -0500348 SetPagePrivate(req->wb_page);
Trond Myklebust277459d2006-12-05 00:35:35 -0500349 set_page_private(req->wb_page, (unsigned long)req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 nfsi->npages++;
351 atomic_inc(&req->wb_count);
352 return 0;
353}
354
355/*
356 * Insert a write request into an inode
357 */
358static void nfs_inode_remove_request(struct nfs_page *req)
359{
360 struct inode *inode = req->wb_context->dentry->d_inode;
361 struct nfs_inode *nfsi = NFS_I(inode);
362
363 BUG_ON (!NFS_WBACK_BUSY(req));
364
365 spin_lock(&nfsi->req_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500366 set_page_private(req->wb_page, 0);
Trond Myklebustdeb7d632006-03-20 13:44:50 -0500367 ClearPagePrivate(req->wb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index);
369 nfsi->npages--;
370 if (!nfsi->npages) {
371 spin_unlock(&nfsi->req_lock);
Trond Myklebust951a1432005-06-22 17:16:30 +0000372 nfs_end_data_update(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 iput(inode);
374 } else
375 spin_unlock(&nfsi->req_lock);
376 nfs_clear_request(req);
377 nfs_release_request(req);
378}
379
380/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 * Add a request to the inode's dirty list.
382 */
383static void
384nfs_mark_request_dirty(struct nfs_page *req)
385{
386 struct inode *inode = req->wb_context->dentry->d_inode;
387 struct nfs_inode *nfsi = NFS_I(inode);
388
389 spin_lock(&nfsi->req_lock);
Trond Myklebust3da28eb2005-06-22 17:16:31 +0000390 radix_tree_tag_set(&nfsi->nfs_page_tree,
391 req->wb_index, NFS_PAGE_TAG_DIRTY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 nfs_list_add_request(req, &nfsi->dirty);
393 nfsi->ndirty++;
394 spin_unlock(&nfsi->req_lock);
Trond Myklebusta1803042006-12-05 00:45:19 -0500395 __mark_inode_dirty(inode, I_DIRTY_PAGES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396}
397
Trond Myklebust61822ab2006-12-05 00:35:42 -0500398static void
399nfs_redirty_request(struct nfs_page *req)
400{
401 clear_bit(PG_FLUSHING, &req->wb_flags);
402 __set_page_dirty_nobuffers(req->wb_page);
403}
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405/*
406 * Check if a request is dirty
407 */
408static inline int
409nfs_dirty_request(struct nfs_page *req)
410{
Trond Myklebuste261f512006-12-05 00:35:41 -0500411 return test_bit(PG_FLUSHING, &req->wb_flags) == 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412}
413
414#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
415/*
416 * Add a request to the inode's commit list.
417 */
418static void
419nfs_mark_request_commit(struct nfs_page *req)
420{
421 struct inode *inode = req->wb_context->dentry->d_inode;
422 struct nfs_inode *nfsi = NFS_I(inode);
423
424 spin_lock(&nfsi->req_lock);
425 nfs_list_add_request(req, &nfsi->commit);
426 nfsi->ncommit++;
427 spin_unlock(&nfsi->req_lock);
Christoph Lameterfd39fc82006-06-30 01:55:40 -0700428 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Trond Myklebusta1803042006-12-05 00:45:19 -0500429 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
431#endif
432
433/*
434 * Wait for a request to complete.
435 *
436 * Interruptible by signals only if mounted with intr flag.
437 */
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500438static int nfs_wait_on_requests_locked(struct inode *inode, unsigned long idx_start, unsigned int npages)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439{
440 struct nfs_inode *nfsi = NFS_I(inode);
441 struct nfs_page *req;
442 unsigned long idx_end, next;
443 unsigned int res = 0;
444 int error;
445
446 if (npages == 0)
447 idx_end = ~0;
448 else
449 idx_end = idx_start + npages - 1;
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 next = idx_start;
Trond Myklebustc6a556b2005-06-22 17:16:30 +0000452 while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_WRITEBACK)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 if (req->wb_index > idx_end)
454 break;
455
456 next = req->wb_index + 1;
Trond Myklebustc6a556b2005-06-22 17:16:30 +0000457 BUG_ON(!NFS_WBACK_BUSY(req));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
459 atomic_inc(&req->wb_count);
460 spin_unlock(&nfsi->req_lock);
461 error = nfs_wait_on_request(req);
462 nfs_release_request(req);
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500463 spin_lock(&nfsi->req_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 if (error < 0)
465 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 res++;
467 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 return res;
469}
470
Trond Myklebust83715ad2006-07-05 13:17:12 -0400471static void nfs_cancel_dirty_list(struct list_head *head)
Trond Myklebustd2ccddf2006-05-31 01:13:38 -0400472{
473 struct nfs_page *req;
474 while(!list_empty(head)) {
475 req = nfs_list_entry(head->next);
476 nfs_list_remove_request(req);
477 nfs_inode_remove_request(req);
478 nfs_clear_page_writeback(req);
479 }
480}
481
Trond Myklebust83715ad2006-07-05 13:17:12 -0400482static void nfs_cancel_commit_list(struct list_head *head)
483{
484 struct nfs_page *req;
485
486 while(!list_empty(head)) {
487 req = nfs_list_entry(head->next);
Trond Myklebustb6dff262006-10-19 23:28:38 -0700488 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Trond Myklebust83715ad2006-07-05 13:17:12 -0400489 nfs_list_remove_request(req);
490 nfs_inode_remove_request(req);
Trond Myklebustb6dff262006-10-19 23:28:38 -0700491 nfs_unlock_request(req);
Trond Myklebust83715ad2006-07-05 13:17:12 -0400492 }
493}
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
496/*
497 * nfs_scan_commit - Scan an inode for commit requests
498 * @inode: NFS inode to scan
499 * @dst: destination list
500 * @idx_start: lower bound of page->index to scan.
501 * @npages: idx_start + npages sets the upper bound to scan.
502 *
503 * Moves requests from the inode's 'commit' request list.
504 * The requests are *not* checked to ensure that they form a contiguous set.
505 */
506static int
507nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages)
508{
509 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust3da28eb2005-06-22 17:16:31 +0000510 int res = 0;
511
512 if (nfsi->ncommit != 0) {
Trond Myklebustd2ccddf2006-05-31 01:13:38 -0400513 res = nfs_scan_list(nfsi, &nfsi->commit, dst, idx_start, npages);
Trond Myklebust3da28eb2005-06-22 17:16:31 +0000514 nfsi->ncommit -= res;
515 if ((nfsi->ncommit == 0) != list_empty(&nfsi->commit))
516 printk(KERN_ERR "NFS: desynchronized value of nfs_i.ncommit.\n");
517 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 return res;
519}
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500520#else
521static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages)
522{
523 return 0;
524}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525#endif
526
527static int nfs_wait_on_write_congestion(struct address_space *mapping, int intr)
528{
529 struct backing_dev_info *bdi = mapping->backing_dev_info;
530 DEFINE_WAIT(wait);
531 int ret = 0;
532
533 might_sleep();
534
535 if (!bdi_write_congested(bdi))
536 return 0;
Chuck Lever91d5b472006-03-20 13:44:14 -0500537
538 nfs_inc_stats(mapping->host, NFSIOS_CONGESTIONWAIT);
539
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if (intr) {
541 struct rpc_clnt *clnt = NFS_CLIENT(mapping->host);
542 sigset_t oldset;
543
544 rpc_clnt_sigmask(clnt, &oldset);
545 prepare_to_wait(&nfs_write_congestion, &wait, TASK_INTERRUPTIBLE);
546 if (bdi_write_congested(bdi)) {
547 if (signalled())
548 ret = -ERESTARTSYS;
549 else
550 schedule();
551 }
552 rpc_clnt_sigunmask(clnt, &oldset);
553 } else {
554 prepare_to_wait(&nfs_write_congestion, &wait, TASK_UNINTERRUPTIBLE);
555 if (bdi_write_congested(bdi))
556 schedule();
557 }
558 finish_wait(&nfs_write_congestion, &wait);
559 return ret;
560}
561
562
563/*
564 * Try to update any existing write request, or create one if there is none.
565 * In order to match, the request's credentials must match those of
566 * the calling process.
567 *
568 * Note: Should always be called with the Page Lock held!
569 */
570static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
Trond Myklebuste21195a2006-12-05 00:35:39 -0500571 struct page *page, unsigned int offset, unsigned int bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572{
Trond Myklebuste21195a2006-12-05 00:35:39 -0500573 struct inode *inode = page->mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 struct nfs_inode *nfsi = NFS_I(inode);
575 struct nfs_page *req, *new = NULL;
576 unsigned long rqend, end;
577
578 end = offset + bytes;
579
Trond Myklebuste21195a2006-12-05 00:35:39 -0500580 if (nfs_wait_on_write_congestion(page->mapping, NFS_SERVER(inode)->flags & NFS_MOUNT_INTR))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 return ERR_PTR(-ERESTARTSYS);
582 for (;;) {
583 /* Loop over all inode entries and see if we find
584 * A request for the page we wish to update
585 */
586 spin_lock(&nfsi->req_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500587 req = nfs_page_find_request_locked(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 if (req) {
589 if (!nfs_lock_request_dontget(req)) {
590 int error;
Trond Myklebust277459d2006-12-05 00:35:35 -0500591
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 spin_unlock(&nfsi->req_lock);
593 error = nfs_wait_on_request(req);
594 nfs_release_request(req);
Neil Brown1dd594b2006-03-20 13:44:04 -0500595 if (error < 0) {
596 if (new)
597 nfs_release_request(new);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 return ERR_PTR(error);
Neil Brown1dd594b2006-03-20 13:44:04 -0500599 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 continue;
601 }
602 spin_unlock(&nfsi->req_lock);
603 if (new)
604 nfs_release_request(new);
605 break;
606 }
607
608 if (new) {
609 int error;
610 nfs_lock_request_dontget(new);
611 error = nfs_inode_add_request(inode, new);
612 if (error) {
613 spin_unlock(&nfsi->req_lock);
614 nfs_unlock_request(new);
615 return ERR_PTR(error);
616 }
617 spin_unlock(&nfsi->req_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 return new;
619 }
620 spin_unlock(&nfsi->req_lock);
621
622 new = nfs_create_request(ctx, inode, page, offset, bytes);
623 if (IS_ERR(new))
624 return new;
625 }
626
627 /* We have a request for our page.
628 * If the creds don't match, or the
629 * page addresses don't match,
630 * tell the caller to wait on the conflicting
631 * request.
632 */
633 rqend = req->wb_offset + req->wb_bytes;
634 if (req->wb_context != ctx
635 || req->wb_page != page
636 || !nfs_dirty_request(req)
637 || offset > rqend || end < req->wb_offset) {
638 nfs_unlock_request(req);
639 return ERR_PTR(-EBUSY);
640 }
641
642 /* Okay, the request matches. Update the region */
643 if (offset < req->wb_offset) {
644 req->wb_offset = offset;
645 req->wb_pgbase = offset;
646 req->wb_bytes = rqend - req->wb_offset;
647 }
648
649 if (end > rqend)
650 req->wb_bytes = end - req->wb_offset;
651
652 return req;
653}
654
655int nfs_flush_incompatible(struct file *file, struct page *page)
656{
657 struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 struct nfs_page *req;
Trond Myklebust1a545332006-12-05 00:35:40 -0500659 int do_flush, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 /*
661 * Look for a request corresponding to this page. If there
662 * is one, and it belongs to another file, we flush it out
663 * before we try to copy anything into the page. Do this
664 * due to the lack of an ACCESS-type call in NFSv2.
665 * Also do the same if we find a request from an existing
666 * dropped page.
667 */
Trond Myklebust1a545332006-12-05 00:35:40 -0500668 do {
669 req = nfs_page_find_request(page);
670 if (req == NULL)
671 return 0;
672 do_flush = req->wb_page != page || req->wb_context != ctx
Trond Myklebuste261f512006-12-05 00:35:41 -0500673 || !nfs_dirty_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 nfs_release_request(req);
Trond Myklebust1a545332006-12-05 00:35:40 -0500675 if (!do_flush)
676 return 0;
677 status = nfs_wb_page(page->mapping->host, page);
678 } while (status == 0);
679 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680}
681
682/*
683 * Update and possibly write a cached page of an NFS file.
684 *
685 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
686 * things with a page scheduled for an RPC call (e.g. invalidate it).
687 */
688int nfs_updatepage(struct file *file, struct page *page,
689 unsigned int offset, unsigned int count)
690{
691 struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 struct inode *inode = page->mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 int status = 0;
694
Chuck Lever91d5b472006-03-20 13:44:14 -0500695 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
696
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 dprintk("NFS: nfs_updatepage(%s/%s %d@%Ld)\n",
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800698 file->f_path.dentry->d_parent->d_name.name,
699 file->f_path.dentry->d_name.name, count,
Chuck Lever0bbacc42005-11-01 16:53:32 -0500700 (long long)(page_offset(page) +offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 /* If we're not using byte range locks, and we know the page
703 * is entirely in cache, it may be more efficient to avoid
704 * fragmenting write requests.
705 */
Trond Myklebustab0a3db2005-06-22 17:16:30 +0000706 if (PageUptodate(page) && inode->i_flock == NULL && !(file->f_mode & O_SYNC)) {
Trond Myklebust49a70f22006-12-05 00:35:38 -0500707 count = max(count + offset, nfs_page_length(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709 }
710
Trond Myklebuste21195a2006-12-05 00:35:39 -0500711 status = nfs_writepage_setup(ctx, page, offset, count);
Trond Myklebuste261f512006-12-05 00:35:41 -0500712 __set_page_dirty_nobuffers(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 dprintk("NFS: nfs_updatepage returns %d (isize %Ld)\n",
715 status, (long long)i_size_read(inode));
716 if (status < 0)
717 ClearPageUptodate(page);
718 return status;
719}
720
721static void nfs_writepage_release(struct nfs_page *req)
722{
723 end_page_writeback(req->wb_page);
724
725#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
726 if (!PageError(req->wb_page)) {
727 if (NFS_NEED_RESCHED(req)) {
Trond Myklebust61822ab2006-12-05 00:35:42 -0500728 nfs_redirty_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 goto out;
730 } else if (NFS_NEED_COMMIT(req)) {
731 nfs_mark_request_commit(req);
732 goto out;
733 }
734 }
735 nfs_inode_remove_request(req);
736
737out:
738 nfs_clear_commit(req);
739 nfs_clear_reschedule(req);
740#else
741 nfs_inode_remove_request(req);
742#endif
Trond Myklebustc6a556b2005-06-22 17:16:30 +0000743 nfs_clear_page_writeback(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744}
745
746static inline int flush_task_priority(int how)
747{
748 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
749 case FLUSH_HIGHPRI:
750 return RPC_PRIORITY_HIGH;
751 case FLUSH_LOWPRI:
752 return RPC_PRIORITY_LOW;
753 }
754 return RPC_PRIORITY_NORMAL;
755}
756
757/*
758 * Set up the argument/result storage required for the RPC call.
759 */
760static void nfs_write_rpcsetup(struct nfs_page *req,
761 struct nfs_write_data *data,
Trond Myklebust788e7a82006-03-20 13:44:27 -0500762 const struct rpc_call_ops *call_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 unsigned int count, unsigned int offset,
764 int how)
765{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 struct inode *inode;
Trond Myklebust788e7a82006-03-20 13:44:27 -0500767 int flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
769 /* Set up the RPC argument and reply structs
770 * NB: take care not to mess about with data->commit et al. */
771
772 data->req = req;
773 data->inode = inode = req->wb_context->dentry->d_inode;
774 data->cred = req->wb_context->cred;
775
776 data->args.fh = NFS_FH(inode);
777 data->args.offset = req_offset(req) + offset;
778 data->args.pgbase = req->wb_pgbase + offset;
779 data->args.pages = data->pagevec;
780 data->args.count = count;
781 data->args.context = req->wb_context;
782
783 data->res.fattr = &data->fattr;
784 data->res.count = count;
785 data->res.verf = &data->verf;
Trond Myklebust0e574af2005-10-27 22:12:38 -0400786 nfs_fattr_init(&data->fattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Trond Myklebust788e7a82006-03-20 13:44:27 -0500788 /* Set up the initial task struct. */
789 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
790 rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 NFS_PROTO(inode)->write_setup(data, how);
792
793 data->task.tk_priority = flush_task_priority(how);
794 data->task.tk_cookie = (unsigned long)inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
Chuck Levera3f565b2007-01-31 12:14:01 -0500796 dprintk("NFS: %5u initiated write call "
797 "(req %s/%Ld, %u bytes @ offset %Lu)\n",
Chuck Lever0bbacc42005-11-01 16:53:32 -0500798 data->task.tk_pid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 inode->i_sb->s_id,
800 (long long)NFS_FILEID(inode),
801 count,
802 (unsigned long long)data->args.offset);
803}
804
805static void nfs_execute_write(struct nfs_write_data *data)
806{
807 struct rpc_clnt *clnt = NFS_CLIENT(data->inode);
808 sigset_t oldset;
809
810 rpc_clnt_sigmask(clnt, &oldset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 rpc_execute(&data->task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 rpc_clnt_sigunmask(clnt, &oldset);
813}
814
815/*
816 * Generate multiple small requests to write out a single
817 * contiguous dirty area on one page.
818 */
Trond Myklebust7d46a492006-03-20 13:44:50 -0500819static int nfs_flush_multi(struct inode *inode, struct list_head *head, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820{
821 struct nfs_page *req = nfs_list_entry(head->next);
822 struct page *page = req->wb_page;
823 struct nfs_write_data *data;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700824 size_t wsize = NFS_SERVER(inode)->wsize, nbytes;
825 unsigned int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 int requests = 0;
827 LIST_HEAD(list);
828
829 nfs_list_remove_request(req);
830
831 nbytes = req->wb_bytes;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700832 do {
833 size_t len = min(nbytes, wsize);
834
835 data = nfs_writedata_alloc(len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 if (!data)
837 goto out_bad;
838 list_add(&data->pages, &list);
839 requests++;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700840 nbytes -= len;
841 } while (nbytes != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 atomic_set(&req->wb_complete, requests);
843
844 ClearPageError(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 offset = 0;
846 nbytes = req->wb_bytes;
847 do {
848 data = list_entry(list.next, struct nfs_write_data, pages);
849 list_del_init(&data->pages);
850
851 data->pagevec[0] = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
853 if (nbytes > wsize) {
Trond Myklebust788e7a82006-03-20 13:44:27 -0500854 nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
855 wsize, offset, how);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 offset += wsize;
857 nbytes -= wsize;
858 } else {
Trond Myklebust788e7a82006-03-20 13:44:27 -0500859 nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
860 nbytes, offset, how);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 nbytes = 0;
862 }
863 nfs_execute_write(data);
864 } while (nbytes != 0);
865
866 return 0;
867
868out_bad:
869 while (!list_empty(&list)) {
870 data = list_entry(list.next, struct nfs_write_data, pages);
871 list_del(&data->pages);
Trond Myklebust8aca67f2006-11-13 16:23:44 -0500872 nfs_writedata_release(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 }
Trond Myklebust61822ab2006-12-05 00:35:42 -0500874 nfs_redirty_request(req);
Trond Myklebustc6a556b2005-06-22 17:16:30 +0000875 nfs_clear_page_writeback(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 return -ENOMEM;
877}
878
879/*
880 * Create an RPC task for the given write request and kick it.
881 * The page must have been locked by the caller.
882 *
883 * It may happen that the page we're passed is not marked dirty.
884 * This is the case if nfs_updatepage detects a conflicting request
885 * that has been written but not committed.
886 */
Trond Myklebust7d46a492006-03-20 13:44:50 -0500887static int nfs_flush_one(struct inode *inode, struct list_head *head, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888{
889 struct nfs_page *req;
890 struct page **pages;
891 struct nfs_write_data *data;
892 unsigned int count;
893
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700894 data = nfs_writedata_alloc(NFS_SERVER(inode)->wsize);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 if (!data)
896 goto out_bad;
897
898 pages = data->pagevec;
899 count = 0;
900 while (!list_empty(head)) {
901 req = nfs_list_entry(head->next);
902 nfs_list_remove_request(req);
903 nfs_list_add_request(req, &data->pages);
904 ClearPageError(req->wb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 *pages++ = req->wb_page;
906 count += req->wb_bytes;
907 }
908 req = nfs_list_entry(data->pages.next);
909
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 /* Set up the argument struct */
Trond Myklebust788e7a82006-03-20 13:44:27 -0500911 nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
913 nfs_execute_write(data);
914 return 0;
915 out_bad:
916 while (!list_empty(head)) {
917 struct nfs_page *req = nfs_list_entry(head->next);
918 nfs_list_remove_request(req);
Trond Myklebust61822ab2006-12-05 00:35:42 -0500919 nfs_redirty_request(req);
Trond Myklebustc6a556b2005-06-22 17:16:30 +0000920 nfs_clear_page_writeback(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 }
922 return -ENOMEM;
923}
924
Trond Myklebust7d46a492006-03-20 13:44:50 -0500925static int nfs_flush_list(struct inode *inode, struct list_head *head, int npages, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926{
927 LIST_HEAD(one_request);
Trond Myklebust7d46a492006-03-20 13:44:50 -0500928 int (*flush_one)(struct inode *, struct list_head *, int);
929 struct nfs_page *req;
930 int wpages = NFS_SERVER(inode)->wpages;
931 int wsize = NFS_SERVER(inode)->wsize;
932 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
Trond Myklebust7d46a492006-03-20 13:44:50 -0500934 flush_one = nfs_flush_one;
935 if (wsize < PAGE_CACHE_SIZE)
936 flush_one = nfs_flush_multi;
937 /* For single writes, FLUSH_STABLE is more efficient */
938 if (npages <= wpages && npages == NFS_I(inode)->npages
939 && nfs_list_entry(head->next)->wb_bytes <= wsize)
940 how |= FLUSH_STABLE;
941
942 do {
943 nfs_coalesce_requests(head, &one_request, wpages);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 req = nfs_list_entry(one_request.next);
Trond Myklebust7d46a492006-03-20 13:44:50 -0500945 error = flush_one(inode, &one_request, how);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 if (error < 0)
Trond Myklebust7d46a492006-03-20 13:44:50 -0500947 goto out_err;
948 } while (!list_empty(head));
949 return 0;
950out_err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 while (!list_empty(head)) {
952 req = nfs_list_entry(head->next);
953 nfs_list_remove_request(req);
Trond Myklebust61822ab2006-12-05 00:35:42 -0500954 nfs_redirty_request(req);
Trond Myklebustc6a556b2005-06-22 17:16:30 +0000955 nfs_clear_page_writeback(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 }
957 return error;
958}
959
960/*
961 * Handle a write reply that flushed part of a page.
962 */
Trond Myklebust788e7a82006-03-20 13:44:27 -0500963static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964{
Trond Myklebust788e7a82006-03-20 13:44:27 -0500965 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 struct nfs_page *req = data->req;
967 struct page *page = req->wb_page;
968
969 dprintk("NFS: write (%s/%Ld %d@%Ld)",
970 req->wb_context->dentry->d_inode->i_sb->s_id,
971 (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
972 req->wb_bytes,
973 (long long)req_offset(req));
974
Trond Myklebust788e7a82006-03-20 13:44:27 -0500975 if (nfs_writeback_done(task, data) != 0)
976 return;
977
978 if (task->tk_status < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979 ClearPageUptodate(page);
980 SetPageError(page);
Trond Myklebust788e7a82006-03-20 13:44:27 -0500981 req->wb_context->error = task->tk_status;
982 dprintk(", error = %d\n", task->tk_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 } else {
984#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
985 if (data->verf.committed < NFS_FILE_SYNC) {
986 if (!NFS_NEED_COMMIT(req)) {
987 nfs_defer_commit(req);
988 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
989 dprintk(" defer commit\n");
990 } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) {
991 nfs_defer_reschedule(req);
992 dprintk(" server reboot detected\n");
993 }
994 } else
995#endif
996 dprintk(" OK\n");
997 }
998
999 if (atomic_dec_and_test(&req->wb_complete))
1000 nfs_writepage_release(req);
1001}
1002
Trond Myklebust788e7a82006-03-20 13:44:27 -05001003static const struct rpc_call_ops nfs_write_partial_ops = {
1004 .rpc_call_done = nfs_writeback_done_partial,
1005 .rpc_release = nfs_writedata_release,
1006};
1007
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008/*
1009 * Handle a write reply that flushes a whole page.
1010 *
1011 * FIXME: There is an inherent race with invalidate_inode_pages and
1012 * writebacks since the page->count is kept > 1 for as long
1013 * as the page has a write request pending.
1014 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001015static void nfs_writeback_done_full(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016{
Trond Myklebust788e7a82006-03-20 13:44:27 -05001017 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 struct nfs_page *req;
1019 struct page *page;
1020
Trond Myklebust788e7a82006-03-20 13:44:27 -05001021 if (nfs_writeback_done(task, data) != 0)
1022 return;
1023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 /* Update attributes as result of writeback. */
1025 while (!list_empty(&data->pages)) {
1026 req = nfs_list_entry(data->pages.next);
1027 nfs_list_remove_request(req);
1028 page = req->wb_page;
1029
1030 dprintk("NFS: write (%s/%Ld %d@%Ld)",
1031 req->wb_context->dentry->d_inode->i_sb->s_id,
1032 (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
1033 req->wb_bytes,
1034 (long long)req_offset(req));
1035
Trond Myklebust788e7a82006-03-20 13:44:27 -05001036 if (task->tk_status < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 ClearPageUptodate(page);
1038 SetPageError(page);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001039 req->wb_context->error = task->tk_status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 end_page_writeback(page);
1041 nfs_inode_remove_request(req);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001042 dprintk(", error = %d\n", task->tk_status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 goto next;
1044 }
1045 end_page_writeback(page);
1046
1047#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1048 if (data->args.stable != NFS_UNSTABLE || data->verf.committed == NFS_FILE_SYNC) {
1049 nfs_inode_remove_request(req);
1050 dprintk(" OK\n");
1051 goto next;
1052 }
1053 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
1054 nfs_mark_request_commit(req);
1055 dprintk(" marked for commit\n");
1056#else
1057 nfs_inode_remove_request(req);
1058#endif
1059 next:
Trond Myklebustc6a556b2005-06-22 17:16:30 +00001060 nfs_clear_page_writeback(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 }
1062}
1063
Trond Myklebust788e7a82006-03-20 13:44:27 -05001064static const struct rpc_call_ops nfs_write_full_ops = {
1065 .rpc_call_done = nfs_writeback_done_full,
1066 .rpc_release = nfs_writedata_release,
1067};
1068
1069
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070/*
1071 * This function is called when the WRITE call is complete.
1072 */
Chuck Lever462d5b32006-03-20 13:44:32 -05001073int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 struct nfs_writeargs *argp = &data->args;
1076 struct nfs_writeres *resp = &data->res;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001077 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
Chuck Levera3f565b2007-01-31 12:14:01 -05001079 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 task->tk_pid, task->tk_status);
1081
Chuck Leverf551e442006-09-20 14:33:04 -04001082 /*
1083 * ->write_done will attempt to use post-op attributes to detect
1084 * conflicting writes by other clients. A strict interpretation
1085 * of close-to-open would allow us to continue caching even if
1086 * another writer had changed the file, but some applications
1087 * depend on tighter cache coherency when writing.
1088 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001089 status = NFS_PROTO(data->inode)->write_done(task, data);
1090 if (status != 0)
1091 return status;
Chuck Lever91d5b472006-03-20 13:44:14 -05001092 nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
1093
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1095 if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
1096 /* We tried a write call, but the server did not
1097 * commit data to stable storage even though we
1098 * requested it.
1099 * Note: There is a known bug in Tru64 < 5.0 in which
1100 * the server reports NFS_DATA_SYNC, but performs
1101 * NFS_FILE_SYNC. We therefore implement this checking
1102 * as a dprintk() in order to avoid filling syslog.
1103 */
1104 static unsigned long complain;
1105
1106 if (time_before(complain, jiffies)) {
1107 dprintk("NFS: faulty NFS server %s:"
1108 " (committed = %d) != (stable = %d)\n",
David Howells54ceac42006-08-22 20:06:13 -04001109 NFS_SERVER(data->inode)->nfs_client->cl_hostname,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 resp->verf->committed, argp->stable);
1111 complain = jiffies + 300 * HZ;
1112 }
1113 }
1114#endif
1115 /* Is this a short write? */
1116 if (task->tk_status >= 0 && resp->count < argp->count) {
1117 static unsigned long complain;
1118
Chuck Lever91d5b472006-03-20 13:44:14 -05001119 nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE);
1120
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 /* Has the server at least made some progress? */
1122 if (resp->count != 0) {
1123 /* Was this an NFSv2 write or an NFSv3 stable write? */
1124 if (resp->verf->committed != NFS_UNSTABLE) {
1125 /* Resend from where the server left off */
1126 argp->offset += resp->count;
1127 argp->pgbase += resp->count;
1128 argp->count -= resp->count;
1129 } else {
1130 /* Resend as a stable write in order to avoid
1131 * headaches in the case of a server crash.
1132 */
1133 argp->stable = NFS_FILE_SYNC;
1134 }
1135 rpc_restart_call(task);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001136 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 }
1138 if (time_before(complain, jiffies)) {
1139 printk(KERN_WARNING
1140 "NFS: Server wrote zero bytes, expected %u.\n",
1141 argp->count);
1142 complain = jiffies + 300 * HZ;
1143 }
1144 /* Can't do anything about it except throw an error. */
1145 task->tk_status = -EIO;
1146 }
Trond Myklebust788e7a82006-03-20 13:44:27 -05001147 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148}
1149
1150
1151#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
Trond Myklebust963d8fe2006-01-03 09:55:04 +01001152void nfs_commit_release(void *wdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154 nfs_commit_free(wdata);
1155}
1156
1157/*
1158 * Set up the argument/result storage required for the RPC call.
1159 */
1160static void nfs_commit_rpcsetup(struct list_head *head,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001161 struct nfs_write_data *data,
1162 int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163{
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001164 struct nfs_page *first;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 struct inode *inode;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001166 int flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
1168 /* Set up the RPC argument and reply structs
1169 * NB: take care not to mess about with data->commit et al. */
1170
1171 list_splice_init(head, &data->pages);
1172 first = nfs_list_entry(data->pages.next);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 inode = first->wb_context->dentry->d_inode;
1174
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 data->inode = inode;
1176 data->cred = first->wb_context->cred;
1177
1178 data->args.fh = NFS_FH(data->inode);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001179 /* Note: we always request a commit of the entire inode */
1180 data->args.offset = 0;
1181 data->args.count = 0;
1182 data->res.count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 data->res.fattr = &data->fattr;
1184 data->res.verf = &data->verf;
Trond Myklebust0e574af2005-10-27 22:12:38 -04001185 nfs_fattr_init(&data->fattr);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001186
1187 /* Set up the initial task struct. */
1188 flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
1189 rpc_init_task(&data->task, NFS_CLIENT(inode), flags, &nfs_commit_ops, data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 NFS_PROTO(inode)->commit_setup(data, how);
1191
1192 data->task.tk_priority = flush_task_priority(how);
1193 data->task.tk_cookie = (unsigned long)inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
Chuck Levera3f565b2007-01-31 12:14:01 -05001195 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196}
1197
1198/*
1199 * Commit dirty pages
1200 */
1201static int
Chuck Lever40859d72005-11-30 18:09:02 -05001202nfs_commit_list(struct inode *inode, struct list_head *head, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203{
1204 struct nfs_write_data *data;
1205 struct nfs_page *req;
1206
Trond Myklebuste9f7bee2006-09-08 09:48:54 -07001207 data = nfs_commit_alloc();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208
1209 if (!data)
1210 goto out_bad;
1211
1212 /* Set up the argument struct */
1213 nfs_commit_rpcsetup(head, data, how);
1214
1215 nfs_execute_write(data);
1216 return 0;
1217 out_bad:
1218 while (!list_empty(head)) {
1219 req = nfs_list_entry(head->next);
1220 nfs_list_remove_request(req);
1221 nfs_mark_request_commit(req);
Trond Myklebust83715ad2006-07-05 13:17:12 -04001222 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Trond Myklebust5c2d97c2006-09-18 23:20:35 -04001223 nfs_clear_page_writeback(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 }
1225 return -ENOMEM;
1226}
1227
1228/*
1229 * COMMIT call returned
1230 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001231static void nfs_commit_done(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232{
Trond Myklebust963d8fe2006-01-03 09:55:04 +01001233 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234 struct nfs_page *req;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
Chuck Levera3f565b2007-01-31 12:14:01 -05001236 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 task->tk_pid, task->tk_status);
1238
Trond Myklebust788e7a82006-03-20 13:44:27 -05001239 /* Call the NFS version-specific code */
1240 if (NFS_PROTO(data->inode)->commit_done(task, data) != 0)
1241 return;
1242
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 while (!list_empty(&data->pages)) {
1244 req = nfs_list_entry(data->pages.next);
1245 nfs_list_remove_request(req);
Christoph Lameterfd39fc82006-06-30 01:55:40 -07001246 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247
1248 dprintk("NFS: commit (%s/%Ld %d@%Ld)",
1249 req->wb_context->dentry->d_inode->i_sb->s_id,
1250 (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
1251 req->wb_bytes,
1252 (long long)req_offset(req));
1253 if (task->tk_status < 0) {
1254 req->wb_context->error = task->tk_status;
1255 nfs_inode_remove_request(req);
1256 dprintk(", error = %d\n", task->tk_status);
1257 goto next;
1258 }
1259
1260 /* Okay, COMMIT succeeded, apparently. Check the verifier
1261 * returned by the server against all stored verfs. */
1262 if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) {
1263 /* We have a match */
1264 nfs_inode_remove_request(req);
1265 dprintk(" OK\n");
1266 goto next;
1267 }
1268 /* We have a mismatch. Write the page again */
1269 dprintk(" mismatch\n");
Trond Myklebust61822ab2006-12-05 00:35:42 -05001270 nfs_redirty_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 next:
Trond Myklebustc6a556b2005-06-22 17:16:30 +00001272 nfs_clear_page_writeback(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274}
Trond Myklebust788e7a82006-03-20 13:44:27 -05001275
1276static const struct rpc_call_ops nfs_commit_ops = {
1277 .rpc_call_done = nfs_commit_done,
1278 .rpc_release = nfs_commit_release,
1279};
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001280#else
1281static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how)
1282{
1283 return 0;
1284}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285#endif
1286
Trond Myklebust3f442542006-09-17 14:46:44 -04001287static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288{
Trond Myklebust28c69252006-09-16 13:04:50 -04001289 struct nfs_inode *nfsi = NFS_I(mapping->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 LIST_HEAD(head);
Trond Myklebust3f442542006-09-17 14:46:44 -04001291 long res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
1293 spin_lock(&nfsi->req_lock);
Trond Myklebust3f442542006-09-17 14:46:44 -04001294 res = nfs_scan_dirty(mapping, wbc, &head);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 spin_unlock(&nfsi->req_lock);
Trond Myklebustab0a3db2005-06-22 17:16:30 +00001296 if (res) {
Trond Myklebust28c69252006-09-16 13:04:50 -04001297 int error = nfs_flush_list(mapping->host, &head, res, how);
Trond Myklebust7d46a492006-03-20 13:44:50 -05001298 if (error < 0)
1299 return error;
Trond Myklebustab0a3db2005-06-22 17:16:30 +00001300 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 return res;
1302}
1303
1304#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001305int nfs_commit_inode(struct inode *inode, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306{
1307 struct nfs_inode *nfsi = NFS_I(inode);
1308 LIST_HEAD(head);
Trond Myklebust7d46a492006-03-20 13:44:50 -05001309 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310
1311 spin_lock(&nfsi->req_lock);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001312 res = nfs_scan_commit(inode, &head, 0, 0);
1313 spin_unlock(&nfsi->req_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 if (res) {
Trond Myklebust7d46a492006-03-20 13:44:50 -05001315 int error = nfs_commit_list(inode, &head, how);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001316 if (error < 0)
1317 return error;
1318 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 return res;
1320}
1321#endif
1322
Trond Myklebust1c759502006-10-09 16:18:38 -04001323long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324{
Trond Myklebust1c759502006-10-09 16:18:38 -04001325 struct inode *inode = mapping->host;
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001326 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust1c759502006-10-09 16:18:38 -04001327 unsigned long idx_start, idx_end;
1328 unsigned int npages = 0;
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001329 LIST_HEAD(head);
Trond Myklebust70b9ecb2006-01-03 09:55:34 +01001330 int nocommit = how & FLUSH_NOCOMMIT;
Trond Myklebust3f442542006-09-17 14:46:44 -04001331 long pages, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332
Trond Myklebust1c759502006-10-09 16:18:38 -04001333 /* FIXME */
1334 if (wbc->range_cyclic)
1335 idx_start = 0;
1336 else {
1337 idx_start = wbc->range_start >> PAGE_CACHE_SHIFT;
1338 idx_end = wbc->range_end >> PAGE_CACHE_SHIFT;
1339 if (idx_end > idx_start) {
1340 unsigned long l_npages = 1 + idx_end - idx_start;
1341 npages = l_npages;
1342 if (sizeof(npages) != sizeof(l_npages) &&
1343 (unsigned long)npages != l_npages)
1344 npages = 0;
1345 }
1346 }
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001347 how &= ~FLUSH_NOCOMMIT;
1348 spin_lock(&nfsi->req_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 do {
Trond Myklebust1c759502006-10-09 16:18:38 -04001350 wbc->pages_skipped = 0;
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001351 ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
1352 if (ret != 0)
Trond Myklebust70b9ecb2006-01-03 09:55:34 +01001353 continue;
Trond Myklebust1c759502006-10-09 16:18:38 -04001354 pages = nfs_scan_dirty(mapping, wbc, &head);
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001355 if (pages != 0) {
1356 spin_unlock(&nfsi->req_lock);
Trond Myklebuste8e058e2006-11-15 17:31:56 -05001357 if (how & FLUSH_INVALIDATE) {
Trond Myklebust83715ad2006-07-05 13:17:12 -04001358 nfs_cancel_dirty_list(&head);
Trond Myklebuste8e058e2006-11-15 17:31:56 -05001359 ret = pages;
1360 } else
Trond Myklebustd2ccddf2006-05-31 01:13:38 -04001361 ret = nfs_flush_list(inode, &head, pages, how);
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001362 spin_lock(&nfsi->req_lock);
1363 continue;
1364 }
Trond Myklebust1c759502006-10-09 16:18:38 -04001365 if (wbc->pages_skipped != 0)
1366 continue;
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001367 if (nocommit)
1368 break;
Trond Myklebustd2ccddf2006-05-31 01:13:38 -04001369 pages = nfs_scan_commit(inode, &head, idx_start, npages);
Trond Myklebust1c759502006-10-09 16:18:38 -04001370 if (pages == 0) {
1371 if (wbc->pages_skipped != 0)
1372 continue;
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001373 break;
Trond Myklebust1c759502006-10-09 16:18:38 -04001374 }
Trond Myklebustd2ccddf2006-05-31 01:13:38 -04001375 if (how & FLUSH_INVALIDATE) {
1376 spin_unlock(&nfsi->req_lock);
Trond Myklebust83715ad2006-07-05 13:17:12 -04001377 nfs_cancel_commit_list(&head);
Trond Myklebuste8e058e2006-11-15 17:31:56 -05001378 ret = pages;
Trond Myklebustd2ccddf2006-05-31 01:13:38 -04001379 spin_lock(&nfsi->req_lock);
1380 continue;
1381 }
1382 pages += nfs_scan_commit(inode, &head, 0, 0);
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001383 spin_unlock(&nfsi->req_lock);
1384 ret = nfs_commit_list(inode, &head, how);
1385 spin_lock(&nfsi->req_lock);
1386 } while (ret >= 0);
1387 spin_unlock(&nfsi->req_lock);
1388 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389}
1390
Trond Myklebust1c759502006-10-09 16:18:38 -04001391/*
1392 * flush the inode to disk.
1393 */
1394int nfs_wb_all(struct inode *inode)
1395{
1396 struct address_space *mapping = inode->i_mapping;
1397 struct writeback_control wbc = {
1398 .bdi = mapping->backing_dev_info,
1399 .sync_mode = WB_SYNC_ALL,
1400 .nr_to_write = LONG_MAX,
Trond Myklebust61822ab2006-12-05 00:35:42 -05001401 .for_writepages = 1,
Trond Myklebust1c759502006-10-09 16:18:38 -04001402 .range_cyclic = 1,
1403 };
1404 int ret;
1405
Trond Myklebust61822ab2006-12-05 00:35:42 -05001406 ret = generic_writepages(mapping, &wbc);
1407 if (ret < 0)
1408 goto out;
Trond Myklebust1c759502006-10-09 16:18:38 -04001409 ret = nfs_sync_mapping_wait(mapping, &wbc, 0);
1410 if (ret >= 0)
1411 return 0;
Trond Myklebust61822ab2006-12-05 00:35:42 -05001412out:
Trond Myklebuste507d9e2006-12-05 00:35:42 -05001413 __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
Trond Myklebust1c759502006-10-09 16:18:38 -04001414 return ret;
1415}
1416
1417int nfs_sync_mapping_range(struct address_space *mapping, loff_t range_start, loff_t range_end, int how)
1418{
1419 struct writeback_control wbc = {
1420 .bdi = mapping->backing_dev_info,
1421 .sync_mode = WB_SYNC_ALL,
1422 .nr_to_write = LONG_MAX,
1423 .range_start = range_start,
1424 .range_end = range_end,
Trond Myklebust61822ab2006-12-05 00:35:42 -05001425 .for_writepages = 1,
Trond Myklebust1c759502006-10-09 16:18:38 -04001426 };
1427 int ret;
1428
Trond Myklebust61822ab2006-12-05 00:35:42 -05001429 if (!(how & FLUSH_NOWRITEPAGE)) {
1430 ret = generic_writepages(mapping, &wbc);
1431 if (ret < 0)
1432 goto out;
1433 }
Trond Myklebust1c759502006-10-09 16:18:38 -04001434 ret = nfs_sync_mapping_wait(mapping, &wbc, how);
1435 if (ret >= 0)
1436 return 0;
Trond Myklebust61822ab2006-12-05 00:35:42 -05001437out:
Trond Myklebuste507d9e2006-12-05 00:35:42 -05001438 __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
Trond Myklebust1c759502006-10-09 16:18:38 -04001439 return ret;
1440}
1441
Trond Myklebust61822ab2006-12-05 00:35:42 -05001442int nfs_wb_page_priority(struct inode *inode, struct page *page, int how)
Trond Myklebust1c759502006-10-09 16:18:38 -04001443{
1444 loff_t range_start = page_offset(page);
1445 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001446 struct writeback_control wbc = {
1447 .bdi = page->mapping->backing_dev_info,
1448 .sync_mode = WB_SYNC_ALL,
1449 .nr_to_write = LONG_MAX,
1450 .range_start = range_start,
1451 .range_end = range_end,
1452 };
1453 int ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001454
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001455 BUG_ON(!PageLocked(page));
1456 if (!(how & FLUSH_NOWRITEPAGE) && clear_page_dirty_for_io(page)) {
1457 ret = nfs_writepage_locked(page, &wbc);
1458 if (ret < 0)
1459 goto out;
1460 }
Trond Myklebustf40313a2007-01-13 02:28:08 -05001461 if (!PagePrivate(page))
1462 return 0;
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001463 ret = nfs_sync_mapping_wait(page->mapping, &wbc, how);
1464 if (ret >= 0)
1465 return 0;
1466out:
Trond Myklebuste507d9e2006-12-05 00:35:42 -05001467 __mark_inode_dirty(inode, I_DIRTY_PAGES);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001468 return ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001469}
1470
1471/*
1472 * Write back all requests on one page - we do this before reading it.
1473 */
1474int nfs_wb_page(struct inode *inode, struct page* page)
1475{
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001476 return nfs_wb_page_priority(inode, page, FLUSH_STABLE);
Trond Myklebust1c759502006-10-09 16:18:38 -04001477}
1478
Trond Myklebust1a545332006-12-05 00:35:40 -05001479int nfs_set_page_dirty(struct page *page)
1480{
1481 struct nfs_page *req;
1482
1483 req = nfs_page_find_request(page);
1484 if (req != NULL) {
1485 /* Mark any existing write requests for flushing */
1486 set_bit(PG_NEED_FLUSH, &req->wb_flags);
1487 nfs_release_request(req);
1488 }
1489 return __set_page_dirty_nobuffers(page);
1490}
1491
Trond Myklebust1c759502006-10-09 16:18:38 -04001492
David Howellsf7b422b2006-06-09 09:34:33 -04001493int __init nfs_init_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494{
1495 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
1496 sizeof(struct nfs_write_data),
1497 0, SLAB_HWCACHE_ALIGN,
1498 NULL, NULL);
1499 if (nfs_wdata_cachep == NULL)
1500 return -ENOMEM;
1501
Matthew Dobson93d23412006-03-26 01:37:50 -08001502 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1503 nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 if (nfs_wdata_mempool == NULL)
1505 return -ENOMEM;
1506
Matthew Dobson93d23412006-03-26 01:37:50 -08001507 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
1508 nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 if (nfs_commit_mempool == NULL)
1510 return -ENOMEM;
1511
1512 return 0;
1513}
1514
David Brownell266bee82006-06-27 12:59:15 -07001515void nfs_destroy_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516{
1517 mempool_destroy(nfs_commit_mempool);
1518 mempool_destroy(nfs_wdata_mempool);
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001519 kmem_cache_destroy(nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520}
1521