blob: 7b54b8bb101fc857a857e58c3f1e09b0a7711e1e [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>
Peter Zijlstra89a09142007-03-16 13:38:26 -080015#include <linux/swap.h>
Trond Myklebust074cc1d2009-08-10 08:54:13 -040016#include <linux/migrate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18#include <linux/sunrpc/clnt.h>
19#include <linux/nfs_fs.h>
20#include <linux/nfs_mount.h>
21#include <linux/nfs_page.h>
Andrew Morton3fcfab12006-10-19 23:28:16 -070022#include <linux/backing-dev.h>
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
26#include "delegation.h"
Trond Myklebust49a70f22006-12-05 00:35:38 -050027#include "internal.h"
Chuck Lever91d5b472006-03-20 13:44:14 -050028#include "iostat.h"
Andy Adamsondef6ed72009-04-01 09:22:26 -040029#include "nfs4_fs.h"
Trond Myklebust074cc1d2009-08-10 08:54:13 -040030#include "fscache.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32#define NFSDBG_FACILITY NFSDBG_PAGECACHE
33
34#define MIN_POOL_WRITE (32)
35#define MIN_POOL_COMMIT (4)
36
37/*
38 * Local function declarations
39 */
Trond Myklebustc63c7b02007-04-02 19:29:52 -040040static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc,
41 struct inode *inode, int ioflags);
Fred Isamanf8512ad2008-03-19 11:24:39 -040042static void nfs_redirty_request(struct nfs_page *req);
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
Trond Myklebustc9d8f892008-04-15 16:56:39 -040051struct nfs_write_data *nfs_commitdata_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
Christoph Lametere6b4f8d2006-12-06 20:33:14 -080053 struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS);
Chuck Lever40859d72005-11-30 18:09:02 -050054
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 if (p) {
56 memset(p, 0, sizeof(*p));
57 INIT_LIST_HEAD(&p->pages);
Andy Adamson5f7dbd52009-04-01 09:22:05 -040058 p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 }
60 return p;
61}
62
Trond Myklebust5e4424a2008-02-25 21:53:49 -080063void nfs_commit_free(struct nfs_write_data *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
Chuck Lever40859d72005-11-30 18:09:02 -050065 if (p && (p->pagevec != &p->page_array[0]))
66 kfree(p->pagevec);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 mempool_free(p, nfs_commit_mempool);
68}
69
Trond Myklebust8d5658c2007-04-10 09:26:35 -040070struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
Trond Myklebust3feb2d42006-03-20 13:44:37 -050071{
Christoph Lametere6b4f8d2006-12-06 20:33:14 -080072 struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS);
Trond Myklebust3feb2d42006-03-20 13:44:37 -050073
74 if (p) {
75 memset(p, 0, sizeof(*p));
76 INIT_LIST_HEAD(&p->pages);
Trond Myklebuste9f7bee2006-09-08 09:48:54 -070077 p->npages = pagecount;
Andy Adamson5f7dbd52009-04-01 09:22:05 -040078 p->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
Chuck Lever0d0b5cb2006-05-25 01:40:53 -040079 if (pagecount <= ARRAY_SIZE(p->page_array))
80 p->pagevec = p->page_array;
Trond Myklebust3feb2d42006-03-20 13:44:37 -050081 else {
Chuck Lever0d0b5cb2006-05-25 01:40:53 -040082 p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
83 if (!p->pagevec) {
Trond Myklebust3feb2d42006-03-20 13:44:37 -050084 mempool_free(p, nfs_wdata_mempool);
85 p = NULL;
86 }
87 }
88 }
89 return p;
90}
91
Trond Myklebust1ae88b22009-08-12 09:12:30 -040092void nfs_writedata_free(struct nfs_write_data *p)
Trond Myklebust3feb2d42006-03-20 13:44:37 -050093{
94 if (p && (p->pagevec != &p->page_array[0]))
95 kfree(p->pagevec);
96 mempool_free(p, nfs_wdata_mempool);
97}
98
Trond Myklebust1ae88b22009-08-12 09:12:30 -040099static void nfs_writedata_release(struct nfs_write_data *wdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
Trond Myklebust383ba712008-02-19 20:04:20 -0500101 put_nfs_open_context(wdata->args.context);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 nfs_writedata_free(wdata);
103}
104
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400105static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
106{
107 ctx->error = error;
108 smp_wmb();
109 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
110}
111
Trond Myklebust277459d2006-12-05 00:35:35 -0500112static struct nfs_page *nfs_page_find_request_locked(struct page *page)
113{
114 struct nfs_page *req = NULL;
115
116 if (PagePrivate(page)) {
117 req = (struct nfs_page *)page_private(page);
118 if (req != NULL)
Trond Myklebustc03b4022007-06-17 13:26:38 -0400119 kref_get(&req->wb_kref);
Trond Myklebust277459d2006-12-05 00:35:35 -0500120 }
121 return req;
122}
123
124static struct nfs_page *nfs_page_find_request(struct page *page)
125{
Trond Myklebust587142f2007-07-02 09:57:54 -0400126 struct inode *inode = page->mapping->host;
Trond Myklebust277459d2006-12-05 00:35:35 -0500127 struct nfs_page *req = NULL;
Trond Myklebust277459d2006-12-05 00:35:35 -0500128
Trond Myklebust587142f2007-07-02 09:57:54 -0400129 spin_lock(&inode->i_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500130 req = nfs_page_find_request_locked(page);
Trond Myklebust587142f2007-07-02 09:57:54 -0400131 spin_unlock(&inode->i_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500132 return req;
133}
134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135/* Adjust the file length if we're writing beyond the end */
136static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
137{
138 struct inode *inode = page->mapping->host;
Trond Myklebusta3d01452008-06-11 12:21:19 -0400139 loff_t end, i_size;
140 pgoff_t end_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Trond Myklebusta3d01452008-06-11 12:21:19 -0400142 spin_lock(&inode->i_lock);
143 i_size = i_size_read(inode);
144 end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 if (i_size > 0 && page->index < end_index)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400146 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
148 if (i_size >= end)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400149 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 i_size_write(inode, end);
Trond Myklebusta3d01452008-06-11 12:21:19 -0400151 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
152out:
153 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
155
Trond Myklebusta301b772007-02-06 11:07:15 -0800156/* A writeback failed: mark the page as bad, and invalidate the page cache */
157static void nfs_set_pageerror(struct page *page)
158{
159 SetPageError(page);
160 nfs_zap_mapping(page->mapping->host, page->mapping);
161}
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163/* We can set the PG_uptodate flag if we see that a write request
164 * covers the full page.
165 */
166static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
167{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if (PageUptodate(page))
169 return;
170 if (base != 0)
171 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500172 if (count != nfs_page_length(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500174 SetPageUptodate(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175}
176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177static int wb_priority(struct writeback_control *wbc)
178{
179 if (wbc->for_reclaim)
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400180 return FLUSH_HIGHPRI | FLUSH_STABLE;
Wu Fengguangb17621f2009-12-03 13:54:25 +0100181 if (wbc->for_kupdate || wbc->for_background)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 return FLUSH_LOWPRI;
183 return 0;
184}
185
186/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800187 * NFS congestion control
188 */
189
190int nfs_congestion_kb;
191
192#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
193#define NFS_CONGESTION_OFF_THRESH \
194 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
195
Trond Myklebust5a6d41b2007-04-14 19:10:12 -0400196static int nfs_set_page_writeback(struct page *page)
Peter Zijlstra89a09142007-03-16 13:38:26 -0800197{
Trond Myklebust5a6d41b2007-04-14 19:10:12 -0400198 int ret = test_set_page_writeback(page);
199
200 if (!ret) {
Peter Zijlstra89a09142007-03-16 13:38:26 -0800201 struct inode *inode = page->mapping->host;
202 struct nfs_server *nfss = NFS_SERVER(inode);
203
Peter Zijlstra277866a2007-05-08 00:35:12 -0700204 if (atomic_long_inc_return(&nfss->writeback) >
Jens Axboe8aa7e842009-07-09 14:52:32 +0200205 NFS_CONGESTION_ON_THRESH) {
206 set_bdi_congested(&nfss->backing_dev_info,
207 BLK_RW_ASYNC);
208 }
Peter Zijlstra89a09142007-03-16 13:38:26 -0800209 }
Trond Myklebust5a6d41b2007-04-14 19:10:12 -0400210 return ret;
Peter Zijlstra89a09142007-03-16 13:38:26 -0800211}
212
213static void nfs_end_page_writeback(struct page *page)
214{
215 struct inode *inode = page->mapping->host;
216 struct nfs_server *nfss = NFS_SERVER(inode);
217
218 end_page_writeback(page);
Peter Zijlstrac4dc4be2007-10-16 23:25:41 -0700219 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
Jens Axboe8aa7e842009-07-09 14:52:32 +0200220 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800221}
222
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400223static struct nfs_page *nfs_find_and_lock_request(struct page *page)
Trond Myklebuste261f512006-12-05 00:35:41 -0500224{
Trond Myklebust587142f2007-07-02 09:57:54 -0400225 struct inode *inode = page->mapping->host;
Trond Myklebuste261f512006-12-05 00:35:41 -0500226 struct nfs_page *req;
Trond Myklebuste261f512006-12-05 00:35:41 -0500227 int ret;
228
Trond Myklebust587142f2007-07-02 09:57:54 -0400229 spin_lock(&inode->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400230 for (;;) {
Trond Myklebuste261f512006-12-05 00:35:41 -0500231 req = nfs_page_find_request_locked(page);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400232 if (req == NULL)
233 break;
Trond Myklebustacee4782008-01-22 17:13:07 -0500234 if (nfs_set_page_tag_locked(req))
Trond Myklebuste261f512006-12-05 00:35:41 -0500235 break;
236 /* Note: If we hold the page lock, as is the case in nfs_writepage,
Trond Myklebustacee4782008-01-22 17:13:07 -0500237 * then the call to nfs_set_page_tag_locked() will always
Trond Myklebuste261f512006-12-05 00:35:41 -0500238 * succeed provided that someone hasn't already marked the
239 * request as dirty (in which case we don't care).
240 */
Trond Myklebust587142f2007-07-02 09:57:54 -0400241 spin_unlock(&inode->i_lock);
Trond Myklebuste261f512006-12-05 00:35:41 -0500242 ret = nfs_wait_on_request(req);
243 nfs_release_request(req);
244 if (ret != 0)
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400245 return ERR_PTR(ret);
Trond Myklebust587142f2007-07-02 09:57:54 -0400246 spin_lock(&inode->i_lock);
Trond Myklebuste261f512006-12-05 00:35:41 -0500247 }
Trond Myklebust587142f2007-07-02 09:57:54 -0400248 spin_unlock(&inode->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400249 return req;
250}
251
252/*
253 * Find an associated nfs write request, and prepare to flush it out
254 * May return an error if the user signalled nfs_wait_on_request().
255 */
256static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
257 struct page *page)
258{
259 struct nfs_page *req;
260 int ret = 0;
261
262 req = nfs_find_and_lock_request(page);
263 if (!req)
264 goto out;
265 ret = PTR_ERR(req);
266 if (IS_ERR(req))
267 goto out;
268
269 ret = nfs_set_page_writeback(page);
270 BUG_ON(ret != 0);
271 BUG_ON(test_bit(PG_CLEAN, &req->wb_flags));
272
Fred Isamanf8512ad2008-03-19 11:24:39 -0400273 if (!nfs_pageio_add_request(pgio, req)) {
274 nfs_redirty_request(req);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400275 ret = pgio->pg_error;
Fred Isamanf8512ad2008-03-19 11:24:39 -0400276 }
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400277out:
278 return ret;
Trond Myklebuste261f512006-12-05 00:35:41 -0500279}
280
Trond Myklebustf758c8852007-07-22 19:27:32 -0400281static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
282{
283 struct inode *inode = page->mapping->host;
284
285 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
286 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
287
288 nfs_pageio_cond_complete(pgio, page->index);
289 return nfs_page_async_flush(pgio, page);
290}
291
Trond Myklebuste261f512006-12-05 00:35:41 -0500292/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 * Write an mmapped page to the server.
294 */
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500295static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400297 struct nfs_pageio_descriptor pgio;
Trond Myklebuste261f512006-12-05 00:35:41 -0500298 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Trond Myklebustf758c8852007-07-22 19:27:32 -0400300 nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc));
301 err = nfs_do_writepage(page, wbc, &pgio);
302 nfs_pageio_complete(&pgio);
303 if (err < 0)
304 return err;
305 if (pgio.pg_error < 0)
306 return pgio.pg_error;
307 return 0;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500308}
309
310int nfs_writepage(struct page *page, struct writeback_control *wbc)
311{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400312 int ret;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500313
Trond Myklebustf758c8852007-07-22 19:27:32 -0400314 ret = nfs_writepage_locked(page, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 unlock_page(page);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400316 return ret;
317}
318
319static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
320{
321 int ret;
322
323 ret = nfs_do_writepage(page, wbc, data);
324 unlock_page(page);
325 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
327
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
329{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 struct inode *inode = mapping->host;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400331 unsigned long *bitlock = &NFS_I(inode)->flags;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400332 struct nfs_pageio_descriptor pgio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 int err;
334
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400335 /* Stop dirtying of new pages while we sync */
336 err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
337 nfs_wait_bit_killable, TASK_KILLABLE);
338 if (err)
339 goto out_err;
340
Chuck Lever91d5b472006-03-20 13:44:14 -0500341 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
342
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400343 nfs_pageio_init_write(&pgio, inode, wb_priority(wbc));
Trond Myklebustf758c8852007-07-22 19:27:32 -0400344 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400345 nfs_pageio_complete(&pgio);
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400346
347 clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
348 smp_mb__after_clear_bit();
349 wake_up_bit(bitlock, NFS_INO_FLUSHING);
350
Trond Myklebustf758c8852007-07-22 19:27:32 -0400351 if (err < 0)
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400352 goto out_err;
353 err = pgio.pg_error;
354 if (err < 0)
355 goto out_err;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400356 return 0;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400357out_err:
358 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
360
361/*
362 * Insert a write request into an inode
363 */
Trond Myklebuste7d39062008-06-13 12:12:32 -0400364static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
366 struct nfs_inode *nfsi = NFS_I(inode);
367 int error;
368
Trond Myklebuste7d39062008-06-13 12:12:32 -0400369 error = radix_tree_preload(GFP_NOFS);
370 if (error != 0)
371 goto out;
372
373 /* Lock the request! */
374 nfs_lock_request_dontget(req);
375
376 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req);
Nick Piggin27852592008-02-04 23:48:37 -0800378 BUG_ON(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 if (!nfsi->npages) {
380 igrab(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 if (nfs_have_delegation(inode, FMODE_WRITE))
382 nfsi->change_attr++;
383 }
Trond Myklebustdeb7d632006-03-20 13:44:50 -0500384 SetPagePrivate(req->wb_page);
Trond Myklebust277459d2006-12-05 00:35:35 -0500385 set_page_private(req->wb_page, (unsigned long)req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 nfsi->npages++;
Trond Myklebustc03b4022007-06-17 13:26:38 -0400387 kref_get(&req->wb_kref);
Nick Piggin27852592008-02-04 23:48:37 -0800388 radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index,
389 NFS_PAGE_TAG_LOCKED);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400390 spin_unlock(&inode->i_lock);
391 radix_tree_preload_end();
392out:
393 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}
395
396/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800397 * Remove a write request from an inode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 */
399static void nfs_inode_remove_request(struct nfs_page *req)
400{
Trond Myklebust88be9f92007-06-05 10:42:27 -0400401 struct inode *inode = req->wb_context->path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 struct nfs_inode *nfsi = NFS_I(inode);
403
404 BUG_ON (!NFS_WBACK_BUSY(req));
405
Trond Myklebust587142f2007-07-02 09:57:54 -0400406 spin_lock(&inode->i_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500407 set_page_private(req->wb_page, 0);
Trond Myklebustdeb7d632006-03-20 13:44:50 -0500408 ClearPagePrivate(req->wb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index);
410 nfsi->npages--;
411 if (!nfsi->npages) {
Trond Myklebust587142f2007-07-02 09:57:54 -0400412 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 iput(inode);
414 } else
Trond Myklebust587142f2007-07-02 09:57:54 -0400415 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 nfs_clear_request(req);
417 nfs_release_request(req);
418}
419
Trond Myklebust61822ab2006-12-05 00:35:42 -0500420static void
Fred6d884e82008-03-19 11:24:38 -0400421nfs_mark_request_dirty(struct nfs_page *req)
Trond Myklebust61822ab2006-12-05 00:35:42 -0500422{
Trond Myklebust61822ab2006-12-05 00:35:42 -0500423 __set_page_dirty_nobuffers(req->wb_page);
424}
425
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
427/*
428 * Add a request to the inode's commit list.
429 */
430static void
431nfs_mark_request_commit(struct nfs_page *req)
432{
Trond Myklebust88be9f92007-06-05 10:42:27 -0400433 struct inode *inode = req->wb_context->path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 struct nfs_inode *nfsi = NFS_I(inode);
435
Trond Myklebust587142f2007-07-02 09:57:54 -0400436 spin_lock(&inode->i_lock);
Trond Myklebuste468bae2008-06-13 13:25:22 -0400437 set_bit(PG_CLEAN, &(req)->wb_flags);
Trond Myklebust5c369682007-06-17 15:27:42 -0400438 radix_tree_tag_set(&nfsi->nfs_page_tree,
439 req->wb_index,
440 NFS_PAGE_TAG_COMMIT);
Trond Myklebust587142f2007-07-02 09:57:54 -0400441 spin_unlock(&inode->i_lock);
Christoph Lameterfd39fc82006-06-30 01:55:40 -0700442 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Peter Zijlstrac9e51e42007-10-16 23:25:47 -0700443 inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE);
Trond Myklebusta1803042006-12-05 00:45:19 -0500444 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445}
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400446
Trond Myklebuste468bae2008-06-13 13:25:22 -0400447static int
448nfs_clear_request_commit(struct nfs_page *req)
449{
450 struct page *page = req->wb_page;
451
452 if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) {
453 dec_zone_page_state(page, NR_UNSTABLE_NFS);
454 dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE);
455 return 1;
456 }
457 return 0;
458}
459
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400460static inline
461int nfs_write_need_commit(struct nfs_write_data *data)
462{
463 return data->verf.committed != NFS_FILE_SYNC;
464}
465
466static inline
467int nfs_reschedule_unstable_write(struct nfs_page *req)
468{
Trond Myklebuste468bae2008-06-13 13:25:22 -0400469 if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) {
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400470 nfs_mark_request_commit(req);
471 return 1;
472 }
473 if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) {
Fred6d884e82008-03-19 11:24:38 -0400474 nfs_mark_request_dirty(req);
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400475 return 1;
476 }
477 return 0;
478}
479#else
480static inline void
481nfs_mark_request_commit(struct nfs_page *req)
482{
483}
484
Trond Myklebuste468bae2008-06-13 13:25:22 -0400485static inline int
486nfs_clear_request_commit(struct nfs_page *req)
487{
488 return 0;
489}
490
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400491static inline
492int nfs_write_need_commit(struct nfs_write_data *data)
493{
494 return 0;
495}
496
497static inline
498int nfs_reschedule_unstable_write(struct nfs_page *req)
499{
500 return 0;
501}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502#endif
503
504/*
505 * Wait for a request to complete.
506 *
Matthew Wilcox150030b2007-12-06 16:24:39 -0500507 * Interruptible by fatal signals only.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 */
Trond Myklebustca52fec2007-04-17 17:22:13 -0400509static int nfs_wait_on_requests_locked(struct inode *inode, pgoff_t idx_start, unsigned int npages)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510{
511 struct nfs_inode *nfsi = NFS_I(inode);
512 struct nfs_page *req;
Trond Myklebustca52fec2007-04-17 17:22:13 -0400513 pgoff_t idx_end, next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 unsigned int res = 0;
515 int error;
516
517 if (npages == 0)
518 idx_end = ~0;
519 else
520 idx_end = idx_start + npages - 1;
521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 next = idx_start;
Trond Myklebust9fd367f2007-06-17 15:10:24 -0400523 while (radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree, (void **)&req, next, 1, NFS_PAGE_TAG_LOCKED)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 if (req->wb_index > idx_end)
525 break;
526
527 next = req->wb_index + 1;
Trond Myklebustc6a556b2005-06-22 17:16:30 +0000528 BUG_ON(!NFS_WBACK_BUSY(req));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Trond Myklebustc03b4022007-06-17 13:26:38 -0400530 kref_get(&req->wb_kref);
Trond Myklebust587142f2007-07-02 09:57:54 -0400531 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 error = nfs_wait_on_request(req);
533 nfs_release_request(req);
Trond Myklebust587142f2007-07-02 09:57:54 -0400534 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 if (error < 0)
536 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 res++;
538 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 return res;
540}
541
Trond Myklebust83715ad2006-07-05 13:17:12 -0400542static void nfs_cancel_commit_list(struct list_head *head)
543{
544 struct nfs_page *req;
545
546 while(!list_empty(head)) {
547 req = nfs_list_entry(head->next);
548 nfs_list_remove_request(req);
Trond Myklebuste468bae2008-06-13 13:25:22 -0400549 nfs_clear_request_commit(req);
Trond Myklebust83715ad2006-07-05 13:17:12 -0400550 nfs_inode_remove_request(req);
Trond Myklebustb6dff262006-10-19 23:28:38 -0700551 nfs_unlock_request(req);
Trond Myklebust83715ad2006-07-05 13:17:12 -0400552 }
553}
554
Trond Myklebust47c62562009-03-16 08:13:41 -0400555#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400556static int
557nfs_need_commit(struct nfs_inode *nfsi)
558{
559 return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT);
560}
561
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562/*
563 * nfs_scan_commit - Scan an inode for commit requests
564 * @inode: NFS inode to scan
565 * @dst: destination list
566 * @idx_start: lower bound of page->index to scan.
567 * @npages: idx_start + npages sets the upper bound to scan.
568 *
569 * Moves requests from the inode's 'commit' request list.
570 * The requests are *not* checked to ensure that they form a contiguous set.
571 */
572static int
Trond Myklebustca52fec2007-04-17 17:22:13 -0400573nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574{
575 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebust3da28eb2005-06-22 17:16:31 +0000576
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400577 if (!nfs_need_commit(nfsi))
578 return 0;
579
580 return nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581}
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500582#else
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400583static inline int nfs_need_commit(struct nfs_inode *nfsi)
584{
585 return 0;
586}
587
Trond Myklebustca52fec2007-04-17 17:22:13 -0400588static inline int nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages)
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500589{
590 return 0;
591}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592#endif
593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594/*
Trond Myklebuste7d39062008-06-13 12:12:32 -0400595 * Search for an existing write request, and attempt to update
596 * it to reflect a new dirty region on a given page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 *
Trond Myklebuste7d39062008-06-13 12:12:32 -0400598 * If the attempt fails, then the existing request is flushed out
599 * to disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 */
Trond Myklebuste7d39062008-06-13 12:12:32 -0400601static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
602 struct page *page,
603 unsigned int offset,
604 unsigned int bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
Trond Myklebuste7d39062008-06-13 12:12:32 -0400606 struct nfs_page *req;
607 unsigned int rqend;
608 unsigned int end;
609 int error;
610
611 if (!PagePrivate(page))
612 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
614 end = offset + bytes;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400615 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 for (;;) {
Trond Myklebust277459d2006-12-05 00:35:35 -0500618 req = nfs_page_find_request_locked(page);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400619 if (req == NULL)
620 goto out_unlock;
Trond Myklebust277459d2006-12-05 00:35:35 -0500621
Trond Myklebuste7d39062008-06-13 12:12:32 -0400622 rqend = req->wb_offset + req->wb_bytes;
623 /*
624 * Tell the caller to flush out the request if
625 * the offsets are non-contiguous.
626 * Note: nfs_flush_incompatible() will already
627 * have flushed out requests having wrong owners.
628 */
Trond Myklebuste468bae2008-06-13 13:25:22 -0400629 if (offset > rqend
Trond Myklebuste7d39062008-06-13 12:12:32 -0400630 || end < req->wb_offset)
631 goto out_flushme;
632
633 if (nfs_set_page_tag_locked(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
Trond Myklebuste7d39062008-06-13 12:12:32 -0400636 /* The request is locked, so wait and then retry */
Trond Myklebust587142f2007-07-02 09:57:54 -0400637 spin_unlock(&inode->i_lock);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400638 error = nfs_wait_on_request(req);
639 nfs_release_request(req);
640 if (error != 0)
641 goto out_err;
642 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 }
644
Trond Myklebuste468bae2008-06-13 13:25:22 -0400645 if (nfs_clear_request_commit(req))
646 radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree,
647 req->wb_index, NFS_PAGE_TAG_COMMIT);
648
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 /* Okay, the request matches. Update the region */
650 if (offset < req->wb_offset) {
651 req->wb_offset = offset;
652 req->wb_pgbase = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 if (end > rqend)
655 req->wb_bytes = end - req->wb_offset;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400656 else
657 req->wb_bytes = rqend - req->wb_offset;
658out_unlock:
659 spin_unlock(&inode->i_lock);
660 return req;
661out_flushme:
662 spin_unlock(&inode->i_lock);
663 nfs_release_request(req);
664 error = nfs_wb_page(inode, page);
665out_err:
666 return ERR_PTR(error);
667}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
Trond Myklebuste7d39062008-06-13 12:12:32 -0400669/*
670 * Try to update an existing write request, or create one if there is none.
671 *
672 * Note: Should always be called with the Page Lock held to prevent races
673 * if we have to add a new request. Also assumes that the caller has
674 * already called nfs_flush_incompatible() if necessary.
675 */
676static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
677 struct page *page, unsigned int offset, unsigned int bytes)
678{
679 struct inode *inode = page->mapping->host;
680 struct nfs_page *req;
681 int error;
682
683 req = nfs_try_to_update_request(inode, page, offset, bytes);
684 if (req != NULL)
685 goto out;
686 req = nfs_create_request(ctx, inode, page, offset, bytes);
687 if (IS_ERR(req))
688 goto out;
689 error = nfs_inode_add_request(inode, req);
690 if (error != 0) {
691 nfs_release_request(req);
692 req = ERR_PTR(error);
693 }
Trond Myklebustefc91ed2008-06-10 18:31:00 -0400694out:
Trond Myklebust61e930a2007-10-18 17:08:05 -0400695 return req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696}
697
Trond Myklebuste7d39062008-06-13 12:12:32 -0400698static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
699 unsigned int offset, unsigned int count)
700{
701 struct nfs_page *req;
702
703 req = nfs_setup_write_request(ctx, page, offset, count);
704 if (IS_ERR(req))
705 return PTR_ERR(req);
706 /* Update file length */
707 nfs_grow_file(page, offset, count);
708 nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
709 nfs_clear_page_tag_locked(req);
710 return 0;
711}
712
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713int nfs_flush_incompatible(struct file *file, struct page *page)
714{
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400715 struct nfs_open_context *ctx = nfs_file_open_context(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 struct nfs_page *req;
Trond Myklebust1a545332006-12-05 00:35:40 -0500717 int do_flush, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 /*
719 * Look for a request corresponding to this page. If there
720 * is one, and it belongs to another file, we flush it out
721 * before we try to copy anything into the page. Do this
722 * due to the lack of an ACCESS-type call in NFSv2.
723 * Also do the same if we find a request from an existing
724 * dropped page.
725 */
Trond Myklebust1a545332006-12-05 00:35:40 -0500726 do {
727 req = nfs_page_find_request(page);
728 if (req == NULL)
729 return 0;
Trond Myklebuste468bae2008-06-13 13:25:22 -0400730 do_flush = req->wb_page != page || req->wb_context != ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 nfs_release_request(req);
Trond Myklebust1a545332006-12-05 00:35:40 -0500732 if (!do_flush)
733 return 0;
734 status = nfs_wb_page(page->mapping->host, page);
735 } while (status == 0);
736 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737}
738
739/*
Trond Myklebust5d47a352008-02-07 17:24:07 -0500740 * If the page cache is marked as unsafe or invalid, then we can't rely on
741 * the PageUptodate() flag. In this case, we will need to turn off
742 * write optimisations that depend on the page contents being correct.
743 */
744static int nfs_write_pageuptodate(struct page *page, struct inode *inode)
745{
746 return PageUptodate(page) &&
747 !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA));
748}
749
750/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 * Update and possibly write a cached page of an NFS file.
752 *
753 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
754 * things with a page scheduled for an RPC call (e.g. invalidate it).
755 */
756int nfs_updatepage(struct file *file, struct page *page,
757 unsigned int offset, unsigned int count)
758{
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400759 struct nfs_open_context *ctx = nfs_file_open_context(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 struct inode *inode = page->mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 int status = 0;
762
Chuck Lever91d5b472006-03-20 13:44:14 -0500763 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
764
Chuck Lever48186c72008-06-11 17:56:05 -0400765 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800766 file->f_path.dentry->d_parent->d_name.name,
767 file->f_path.dentry->d_name.name, count,
Chuck Lever48186c72008-06-11 17:56:05 -0400768 (long long)(page_offset(page) + offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 /* If we're not using byte range locks, and we know the page
Trond Myklebust5d47a352008-02-07 17:24:07 -0500771 * is up to date, it may be more efficient to extend the write
772 * to cover the entire page in order to avoid fragmentation
773 * inefficiencies.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 */
Trond Myklebust5d47a352008-02-07 17:24:07 -0500775 if (nfs_write_pageuptodate(page, inode) &&
776 inode->i_flock == NULL &&
Christoph Hellwig6b2f3d12009-10-27 11:05:28 +0100777 !(file->f_flags & O_DSYNC)) {
Trond Myklebust49a70f22006-12-05 00:35:38 -0500778 count = max(count + offset, nfs_page_length(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 }
781
Trond Myklebuste21195a2006-12-05 00:35:39 -0500782 status = nfs_writepage_setup(ctx, page, offset, count);
Trond Myklebust03fa9e82008-06-05 16:02:35 -0400783 if (status < 0)
784 nfs_set_pageerror(page);
785 else
786 __set_page_dirty_nobuffers(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
Chuck Lever48186c72008-06-11 17:56:05 -0400788 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 status, (long long)i_size_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 return status;
791}
792
793static void nfs_writepage_release(struct nfs_page *req)
794{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795
Trond Myklebust7e5f6142008-05-25 12:59:19 -0400796 if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req)) {
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400797 nfs_end_page_writeback(req->wb_page);
798 nfs_inode_remove_request(req);
799 } else
800 nfs_end_page_writeback(req->wb_page);
Trond Myklebust9fd367f2007-06-17 15:10:24 -0400801 nfs_clear_page_tag_locked(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802}
803
Trond Myklebust3ff75762007-07-14 15:40:00 -0400804static int flush_task_priority(int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805{
806 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
807 case FLUSH_HIGHPRI:
808 return RPC_PRIORITY_HIGH;
809 case FLUSH_LOWPRI:
810 return RPC_PRIORITY_LOW;
811 }
812 return RPC_PRIORITY_NORMAL;
813}
814
815/*
816 * Set up the argument/result storage required for the RPC call.
817 */
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400818static int nfs_write_rpcsetup(struct nfs_page *req,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 struct nfs_write_data *data,
Trond Myklebust788e7a82006-03-20 13:44:27 -0500820 const struct rpc_call_ops *call_ops,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 unsigned int count, unsigned int offset,
822 int how)
823{
Trond Myklebust84115e12007-07-14 15:39:59 -0400824 struct inode *inode = req->wb_context->path.dentry->d_inode;
825 int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
Trond Myklebust3ff75762007-07-14 15:40:00 -0400826 int priority = flush_task_priority(how);
Trond Myklebust07737692007-10-25 18:42:54 -0400827 struct rpc_task *task;
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400828 struct rpc_message msg = {
829 .rpc_argp = &data->args,
830 .rpc_resp = &data->res,
831 .rpc_cred = req->wb_context->cred,
832 };
Trond Myklebust84115e12007-07-14 15:39:59 -0400833 struct rpc_task_setup task_setup_data = {
834 .rpc_client = NFS_CLIENT(inode),
Trond Myklebust07737692007-10-25 18:42:54 -0400835 .task = &data->task,
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400836 .rpc_message = &msg,
Trond Myklebust84115e12007-07-14 15:39:59 -0400837 .callback_ops = call_ops,
838 .callback_data = data,
Trond Myklebust101070c2008-02-19 20:04:23 -0500839 .workqueue = nfsiod_workqueue,
Trond Myklebust84115e12007-07-14 15:39:59 -0400840 .flags = flags,
Trond Myklebust3ff75762007-07-14 15:40:00 -0400841 .priority = priority,
Trond Myklebust84115e12007-07-14 15:39:59 -0400842 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
844 /* Set up the RPC argument and reply structs
845 * NB: take care not to mess about with data->commit et al. */
846
847 data->req = req;
Trond Myklebust88be9f92007-06-05 10:42:27 -0400848 data->inode = inode = req->wb_context->path.dentry->d_inode;
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400849 data->cred = msg.rpc_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
851 data->args.fh = NFS_FH(inode);
852 data->args.offset = req_offset(req) + offset;
853 data->args.pgbase = req->wb_pgbase + offset;
854 data->args.pages = data->pagevec;
855 data->args.count = count;
Trond Myklebust383ba712008-02-19 20:04:20 -0500856 data->args.context = get_nfs_open_context(req->wb_context);
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400857 data->args.stable = NFS_UNSTABLE;
858 if (how & FLUSH_STABLE) {
859 data->args.stable = NFS_DATA_SYNC;
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400860 if (!nfs_need_commit(NFS_I(inode)))
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400861 data->args.stable = NFS_FILE_SYNC;
862 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
864 data->res.fattr = &data->fattr;
865 data->res.count = count;
866 data->res.verf = &data->verf;
Trond Myklebust0e574af2005-10-27 22:12:38 -0400867 nfs_fattr_init(&data->fattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868
Trond Myklebust788e7a82006-03-20 13:44:27 -0500869 /* Set up the initial task struct. */
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400870 NFS_PROTO(inode)->write_setup(data, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Chuck Levera3f565b2007-01-31 12:14:01 -0500872 dprintk("NFS: %5u initiated write call "
Chuck Lever48186c72008-06-11 17:56:05 -0400873 "(req %s/%lld, %u bytes @ offset %llu)\n",
Chuck Lever0bbacc42005-11-01 16:53:32 -0500874 data->task.tk_pid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 inode->i_sb->s_id,
876 (long long)NFS_FILEID(inode),
877 count,
878 (unsigned long long)data->args.offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
Trond Myklebust07737692007-10-25 18:42:54 -0400880 task = rpc_run_task(&task_setup_data);
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400881 if (IS_ERR(task))
882 return PTR_ERR(task);
883 rpc_put_task(task);
884 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885}
886
Fred6d884e82008-03-19 11:24:38 -0400887/* If a nfs_flush_* function fails, it should remove reqs from @head and
888 * call this on each, which will prepare them to be retried on next
889 * writeback using standard nfs.
890 */
891static void nfs_redirty_request(struct nfs_page *req)
892{
893 nfs_mark_request_dirty(req);
894 nfs_end_page_writeback(req->wb_page);
895 nfs_clear_page_tag_locked(req);
896}
897
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898/*
899 * Generate multiple small requests to write out a single
900 * contiguous dirty area on one page.
901 */
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400902static int nfs_flush_multi(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903{
904 struct nfs_page *req = nfs_list_entry(head->next);
905 struct page *page = req->wb_page;
906 struct nfs_write_data *data;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700907 size_t wsize = NFS_SERVER(inode)->wsize, nbytes;
908 unsigned int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 int requests = 0;
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400910 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 LIST_HEAD(list);
912
913 nfs_list_remove_request(req);
914
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400915 nbytes = count;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700916 do {
917 size_t len = min(nbytes, wsize);
918
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400919 data = nfs_writedata_alloc(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 if (!data)
921 goto out_bad;
922 list_add(&data->pages, &list);
923 requests++;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700924 nbytes -= len;
925 } while (nbytes != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 atomic_set(&req->wb_complete, requests);
927
928 ClearPageError(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 offset = 0;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400930 nbytes = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 do {
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400932 int ret2;
933
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 data = list_entry(list.next, struct nfs_write_data, pages);
935 list_del_init(&data->pages);
936
937 data->pagevec[0] = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400939 if (nbytes < wsize)
940 wsize = nbytes;
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400941 ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400942 wsize, offset, how);
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400943 if (ret == 0)
944 ret = ret2;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400945 offset += wsize;
946 nbytes -= wsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 } while (nbytes != 0);
948
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400949 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950
951out_bad:
952 while (!list_empty(&list)) {
953 data = list_entry(list.next, struct nfs_write_data, pages);
954 list_del(&data->pages);
Trond Myklebust8aca67f2006-11-13 16:23:44 -0500955 nfs_writedata_release(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 }
Trond Myklebust61822ab2006-12-05 00:35:42 -0500957 nfs_redirty_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 return -ENOMEM;
959}
960
961/*
962 * Create an RPC task for the given write request and kick it.
963 * The page must have been locked by the caller.
964 *
965 * It may happen that the page we're passed is not marked dirty.
966 * This is the case if nfs_updatepage detects a conflicting request
967 * that has been written but not committed.
968 */
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400969static int nfs_flush_one(struct inode *inode, struct list_head *head, unsigned int npages, size_t count, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970{
971 struct nfs_page *req;
972 struct page **pages;
973 struct nfs_write_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400975 data = nfs_writedata_alloc(npages);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 if (!data)
977 goto out_bad;
978
979 pages = data->pagevec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 while (!list_empty(head)) {
981 req = nfs_list_entry(head->next);
982 nfs_list_remove_request(req);
983 nfs_list_add_request(req, &data->pages);
984 ClearPageError(req->wb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 *pages++ = req->wb_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 }
987 req = nfs_list_entry(data->pages.next);
988
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 /* Set up the argument struct */
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400990 return nfs_write_rpcsetup(req, data, &nfs_write_full_ops, count, 0, how);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 out_bad:
992 while (!list_empty(head)) {
Trond Myklebust10afec92007-05-14 17:16:04 -0400993 req = nfs_list_entry(head->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 nfs_list_remove_request(req);
Trond Myklebust61822ab2006-12-05 00:35:42 -0500995 nfs_redirty_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 }
997 return -ENOMEM;
998}
999
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001000static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
1001 struct inode *inode, int ioflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002{
Chuck Leverbf4285e2007-12-20 14:54:57 -05001003 size_t wsize = NFS_SERVER(inode)->wsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001005 if (wsize < PAGE_CACHE_SIZE)
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001006 nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags);
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001007 else
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001008 nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009}
1010
1011/*
1012 * Handle a write reply that flushed part of a page.
1013 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001014static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015{
Trond Myklebust788e7a82006-03-20 13:44:27 -05001016 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
Chuck Lever48186c72008-06-11 17:56:05 -04001018 dprintk("NFS: %5u write(%s/%lld %d@%lld)",
1019 task->tk_pid,
1020 data->req->wb_context->path.dentry->d_inode->i_sb->s_id,
1021 (long long)
1022 NFS_FILEID(data->req->wb_context->path.dentry->d_inode),
1023 data->req->wb_bytes, (long long)req_offset(data->req));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001025 nfs_writeback_done(task, data);
1026}
Trond Myklebust788e7a82006-03-20 13:44:27 -05001027
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001028static void nfs_writeback_release_partial(void *calldata)
1029{
1030 struct nfs_write_data *data = calldata;
1031 struct nfs_page *req = data->req;
1032 struct page *page = req->wb_page;
1033 int status = data->task.tk_status;
1034
1035 if (status < 0) {
Trond Myklebusta301b772007-02-06 11:07:15 -08001036 nfs_set_pageerror(page);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001037 nfs_context_set_write_error(req->wb_context, status);
1038 dprintk(", error = %d\n", status);
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001039 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 }
1041
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001042 if (nfs_write_need_commit(data)) {
Trond Myklebust587142f2007-07-02 09:57:54 -04001043 struct inode *inode = page->mapping->host;
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001044
Trond Myklebust587142f2007-07-02 09:57:54 -04001045 spin_lock(&inode->i_lock);
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001046 if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) {
1047 /* Do nothing we need to resend the writes */
1048 } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) {
1049 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
1050 dprintk(" defer commit\n");
1051 } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) {
1052 set_bit(PG_NEED_RESCHED, &req->wb_flags);
1053 clear_bit(PG_NEED_COMMIT, &req->wb_flags);
1054 dprintk(" server reboot detected\n");
1055 }
Trond Myklebust587142f2007-07-02 09:57:54 -04001056 spin_unlock(&inode->i_lock);
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001057 } else
1058 dprintk(" OK\n");
1059
1060out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 if (atomic_dec_and_test(&req->wb_complete))
1062 nfs_writepage_release(req);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001063 nfs_writedata_release(calldata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064}
1065
Andy Adamsondef6ed72009-04-01 09:22:26 -04001066#if defined(CONFIG_NFS_V4_1)
1067void nfs_write_prepare(struct rpc_task *task, void *calldata)
1068{
1069 struct nfs_write_data *data = calldata;
1070 struct nfs_client *clp = (NFS_SERVER(data->inode))->nfs_client;
1071
1072 if (nfs4_setup_sequence(clp, &data->args.seq_args,
1073 &data->res.seq_res, 1, task))
1074 return;
1075 rpc_call_start(task);
1076}
1077#endif /* CONFIG_NFS_V4_1 */
1078
Trond Myklebust788e7a82006-03-20 13:44:27 -05001079static const struct rpc_call_ops nfs_write_partial_ops = {
Andy Adamsondef6ed72009-04-01 09:22:26 -04001080#if defined(CONFIG_NFS_V4_1)
1081 .rpc_call_prepare = nfs_write_prepare,
1082#endif /* CONFIG_NFS_V4_1 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001083 .rpc_call_done = nfs_writeback_done_partial,
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001084 .rpc_release = nfs_writeback_release_partial,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001085};
1086
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087/*
1088 * Handle a write reply that flushes a whole page.
1089 *
1090 * FIXME: There is an inherent race with invalidate_inode_pages and
1091 * writebacks since the page->count is kept > 1 for as long
1092 * as the page has a write request pending.
1093 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001094static void nfs_writeback_done_full(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095{
Trond Myklebust788e7a82006-03-20 13:44:27 -05001096 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001098 nfs_writeback_done(task, data);
1099}
1100
1101static void nfs_writeback_release_full(void *calldata)
1102{
1103 struct nfs_write_data *data = calldata;
1104 int status = data->task.tk_status;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001105
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 /* Update attributes as result of writeback. */
1107 while (!list_empty(&data->pages)) {
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001108 struct nfs_page *req = nfs_list_entry(data->pages.next);
1109 struct page *page = req->wb_page;
1110
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 nfs_list_remove_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112
Chuck Lever48186c72008-06-11 17:56:05 -04001113 dprintk("NFS: %5u write (%s/%lld %d@%lld)",
1114 data->task.tk_pid,
Trond Myklebust88be9f92007-06-05 10:42:27 -04001115 req->wb_context->path.dentry->d_inode->i_sb->s_id,
1116 (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 req->wb_bytes,
1118 (long long)req_offset(req));
1119
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001120 if (status < 0) {
Trond Myklebusta301b772007-02-06 11:07:15 -08001121 nfs_set_pageerror(page);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001122 nfs_context_set_write_error(req->wb_context, status);
1123 dprintk(", error = %d\n", status);
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001124 goto remove_request;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001127 if (nfs_write_need_commit(data)) {
1128 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
1129 nfs_mark_request_commit(req);
1130 nfs_end_page_writeback(page);
1131 dprintk(" marked for commit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 goto next;
1133 }
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001134 dprintk(" OK\n");
1135remove_request:
1136 nfs_end_page_writeback(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 nfs_inode_remove_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 next:
Trond Myklebust9fd367f2007-06-17 15:10:24 -04001139 nfs_clear_page_tag_locked(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 }
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001141 nfs_writedata_release(calldata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142}
1143
Trond Myklebust788e7a82006-03-20 13:44:27 -05001144static const struct rpc_call_ops nfs_write_full_ops = {
Andy Adamsondef6ed72009-04-01 09:22:26 -04001145#if defined(CONFIG_NFS_V4_1)
1146 .rpc_call_prepare = nfs_write_prepare,
1147#endif /* CONFIG_NFS_V4_1 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001148 .rpc_call_done = nfs_writeback_done_full,
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001149 .rpc_release = nfs_writeback_release_full,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001150};
1151
1152
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153/*
1154 * This function is called when the WRITE call is complete.
1155 */
Chuck Lever462d5b32006-03-20 13:44:32 -05001156int nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 struct nfs_writeargs *argp = &data->args;
1159 struct nfs_writeres *resp = &data->res;
Andy Adamsoneedc0202009-04-01 09:22:41 -04001160 struct nfs_server *server = NFS_SERVER(data->inode);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001161 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001162
Chuck Levera3f565b2007-01-31 12:14:01 -05001163 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 task->tk_pid, task->tk_status);
1165
Chuck Leverf551e442006-09-20 14:33:04 -04001166 /*
1167 * ->write_done will attempt to use post-op attributes to detect
1168 * conflicting writes by other clients. A strict interpretation
1169 * of close-to-open would allow us to continue caching even if
1170 * another writer had changed the file, but some applications
1171 * depend on tighter cache coherency when writing.
1172 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001173 status = NFS_PROTO(data->inode)->write_done(task, data);
1174 if (status != 0)
1175 return status;
Chuck Lever91d5b472006-03-20 13:44:14 -05001176 nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
1177
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1179 if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
1180 /* We tried a write call, but the server did not
1181 * commit data to stable storage even though we
1182 * requested it.
1183 * Note: There is a known bug in Tru64 < 5.0 in which
1184 * the server reports NFS_DATA_SYNC, but performs
1185 * NFS_FILE_SYNC. We therefore implement this checking
1186 * as a dprintk() in order to avoid filling syslog.
1187 */
1188 static unsigned long complain;
1189
1190 if (time_before(complain, jiffies)) {
Chuck Lever48186c72008-06-11 17:56:05 -04001191 dprintk("NFS: faulty NFS server %s:"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 " (committed = %d) != (stable = %d)\n",
Andy Adamsoneedc0202009-04-01 09:22:41 -04001193 server->nfs_client->cl_hostname,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 resp->verf->committed, argp->stable);
1195 complain = jiffies + 300 * HZ;
1196 }
1197 }
1198#endif
1199 /* Is this a short write? */
1200 if (task->tk_status >= 0 && resp->count < argp->count) {
1201 static unsigned long complain;
1202
Chuck Lever91d5b472006-03-20 13:44:14 -05001203 nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE);
1204
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 /* Has the server at least made some progress? */
1206 if (resp->count != 0) {
1207 /* Was this an NFSv2 write or an NFSv3 stable write? */
1208 if (resp->verf->committed != NFS_UNSTABLE) {
1209 /* Resend from where the server left off */
1210 argp->offset += resp->count;
1211 argp->pgbase += resp->count;
1212 argp->count -= resp->count;
1213 } else {
1214 /* Resend as a stable write in order to avoid
1215 * headaches in the case of a server crash.
1216 */
1217 argp->stable = NFS_FILE_SYNC;
1218 }
Trond Myklebust0110ee12009-12-07 09:00:24 -05001219 nfs_restart_rpc(task, server->nfs_client);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001220 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 }
1222 if (time_before(complain, jiffies)) {
1223 printk(KERN_WARNING
1224 "NFS: Server wrote zero bytes, expected %u.\n",
1225 argp->count);
1226 complain = jiffies + 300 * HZ;
1227 }
1228 /* Can't do anything about it except throw an error. */
1229 task->tk_status = -EIO;
1230 }
Trond Myklebust788e7a82006-03-20 13:44:27 -05001231 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232}
1233
1234
1235#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
H Hartley Sweeten0aa05882010-01-26 15:42:03 -05001236static void nfs_commitdata_release(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237{
Trond Myklebust383ba712008-02-19 20:04:20 -05001238 struct nfs_write_data *wdata = data;
1239
1240 put_nfs_open_context(wdata->args.context);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 nfs_commit_free(wdata);
1242}
1243
1244/*
1245 * Set up the argument/result storage required for the RPC call.
1246 */
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001247static int nfs_commit_rpcsetup(struct list_head *head,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001248 struct nfs_write_data *data,
1249 int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250{
Trond Myklebust84115e12007-07-14 15:39:59 -04001251 struct nfs_page *first = nfs_list_entry(head->next);
1252 struct inode *inode = first->wb_context->path.dentry->d_inode;
1253 int flags = (how & FLUSH_SYNC) ? 0 : RPC_TASK_ASYNC;
Trond Myklebust3ff75762007-07-14 15:40:00 -04001254 int priority = flush_task_priority(how);
Trond Myklebust07737692007-10-25 18:42:54 -04001255 struct rpc_task *task;
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001256 struct rpc_message msg = {
1257 .rpc_argp = &data->args,
1258 .rpc_resp = &data->res,
1259 .rpc_cred = first->wb_context->cred,
1260 };
Trond Myklebust84115e12007-07-14 15:39:59 -04001261 struct rpc_task_setup task_setup_data = {
Trond Myklebust07737692007-10-25 18:42:54 -04001262 .task = &data->task,
Trond Myklebust84115e12007-07-14 15:39:59 -04001263 .rpc_client = NFS_CLIENT(inode),
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001264 .rpc_message = &msg,
Trond Myklebust84115e12007-07-14 15:39:59 -04001265 .callback_ops = &nfs_commit_ops,
1266 .callback_data = data,
Trond Myklebust101070c2008-02-19 20:04:23 -05001267 .workqueue = nfsiod_workqueue,
Trond Myklebust84115e12007-07-14 15:39:59 -04001268 .flags = flags,
Trond Myklebust3ff75762007-07-14 15:40:00 -04001269 .priority = priority,
Trond Myklebust84115e12007-07-14 15:39:59 -04001270 };
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271
1272 /* Set up the RPC argument and reply structs
1273 * NB: take care not to mess about with data->commit et al. */
1274
1275 list_splice_init(head, &data->pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 data->inode = inode;
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001278 data->cred = msg.rpc_cred;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279
1280 data->args.fh = NFS_FH(data->inode);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001281 /* Note: we always request a commit of the entire inode */
1282 data->args.offset = 0;
1283 data->args.count = 0;
Trond Myklebust383ba712008-02-19 20:04:20 -05001284 data->args.context = get_nfs_open_context(first->wb_context);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001285 data->res.count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 data->res.fattr = &data->fattr;
1287 data->res.verf = &data->verf;
Trond Myklebust0e574af2005-10-27 22:12:38 -04001288 nfs_fattr_init(&data->fattr);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001289
1290 /* Set up the initial task struct. */
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001291 NFS_PROTO(inode)->commit_setup(data, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292
Chuck Levera3f565b2007-01-31 12:14:01 -05001293 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001294
Trond Myklebust07737692007-10-25 18:42:54 -04001295 task = rpc_run_task(&task_setup_data);
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001296 if (IS_ERR(task))
1297 return PTR_ERR(task);
1298 rpc_put_task(task);
1299 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300}
1301
1302/*
1303 * Commit dirty pages
1304 */
1305static int
Chuck Lever40859d72005-11-30 18:09:02 -05001306nfs_commit_list(struct inode *inode, struct list_head *head, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307{
1308 struct nfs_write_data *data;
1309 struct nfs_page *req;
1310
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001311 data = nfs_commitdata_alloc();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312
1313 if (!data)
1314 goto out_bad;
1315
1316 /* Set up the argument struct */
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001317 return nfs_commit_rpcsetup(head, data, how);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 out_bad:
1319 while (!list_empty(head)) {
1320 req = nfs_list_entry(head->next);
1321 nfs_list_remove_request(req);
1322 nfs_mark_request_commit(req);
Trond Myklebust83715ad2006-07-05 13:17:12 -04001323 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Peter Zijlstrac9e51e42007-10-16 23:25:47 -07001324 dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
1325 BDI_RECLAIMABLE);
Trond Myklebust9fd367f2007-06-17 15:10:24 -04001326 nfs_clear_page_tag_locked(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 }
1328 return -ENOMEM;
1329}
1330
1331/*
1332 * COMMIT call returned
1333 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001334static void nfs_commit_done(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335{
Trond Myklebust963d8fe2006-01-03 09:55:04 +01001336 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
Chuck Levera3f565b2007-01-31 12:14:01 -05001338 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 task->tk_pid, task->tk_status);
1340
Trond Myklebust788e7a82006-03-20 13:44:27 -05001341 /* Call the NFS version-specific code */
1342 if (NFS_PROTO(data->inode)->commit_done(task, data) != 0)
1343 return;
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001344}
1345
1346static void nfs_commit_release(void *calldata)
1347{
1348 struct nfs_write_data *data = calldata;
1349 struct nfs_page *req;
1350 int status = data->task.tk_status;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001351
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 while (!list_empty(&data->pages)) {
1353 req = nfs_list_entry(data->pages.next);
1354 nfs_list_remove_request(req);
Trond Myklebuste468bae2008-06-13 13:25:22 -04001355 nfs_clear_request_commit(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356
Chuck Lever48186c72008-06-11 17:56:05 -04001357 dprintk("NFS: commit (%s/%lld %d@%lld)",
Trond Myklebust88be9f92007-06-05 10:42:27 -04001358 req->wb_context->path.dentry->d_inode->i_sb->s_id,
1359 (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 req->wb_bytes,
1361 (long long)req_offset(req));
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001362 if (status < 0) {
1363 nfs_context_set_write_error(req->wb_context, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 nfs_inode_remove_request(req);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001365 dprintk(", error = %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 goto next;
1367 }
1368
1369 /* Okay, COMMIT succeeded, apparently. Check the verifier
1370 * returned by the server against all stored verfs. */
1371 if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) {
1372 /* We have a match */
1373 nfs_inode_remove_request(req);
1374 dprintk(" OK\n");
1375 goto next;
1376 }
1377 /* We have a mismatch. Write the page again */
1378 dprintk(" mismatch\n");
Fred6d884e82008-03-19 11:24:38 -04001379 nfs_mark_request_dirty(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 next:
Trond Myklebust9fd367f2007-06-17 15:10:24 -04001381 nfs_clear_page_tag_locked(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 }
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001383 nfs_commitdata_release(calldata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384}
Trond Myklebust788e7a82006-03-20 13:44:27 -05001385
1386static const struct rpc_call_ops nfs_commit_ops = {
Andy Adamson21d9a852009-04-01 09:22:27 -04001387#if defined(CONFIG_NFS_V4_1)
1388 .rpc_call_prepare = nfs_write_prepare,
1389#endif /* CONFIG_NFS_V4_1 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001390 .rpc_call_done = nfs_commit_done,
1391 .rpc_release = nfs_commit_release,
1392};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001394int nfs_commit_inode(struct inode *inode, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 LIST_HEAD(head);
Trond Myklebust7d46a492006-03-20 13:44:50 -05001397 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398
Trond Myklebust587142f2007-07-02 09:57:54 -04001399 spin_lock(&inode->i_lock);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001400 res = nfs_scan_commit(inode, &head, 0, 0);
Trond Myklebust587142f2007-07-02 09:57:54 -04001401 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 if (res) {
Trond Myklebust7d46a492006-03-20 13:44:50 -05001403 int error = nfs_commit_list(inode, &head, how);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001404 if (error < 0)
1405 return error;
1406 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 return res;
1408}
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001409#else
1410static inline int nfs_commit_list(struct inode *inode, struct list_head *head, int how)
1411{
1412 return 0;
1413}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414#endif
1415
Trond Myklebust1c759502006-10-09 16:18:38 -04001416long nfs_sync_mapping_wait(struct address_space *mapping, struct writeback_control *wbc, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417{
Trond Myklebust1c759502006-10-09 16:18:38 -04001418 struct inode *inode = mapping->host;
Trond Myklebustca52fec2007-04-17 17:22:13 -04001419 pgoff_t idx_start, idx_end;
Trond Myklebust1c759502006-10-09 16:18:38 -04001420 unsigned int npages = 0;
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001421 LIST_HEAD(head);
Trond Myklebust70b9ecb2006-01-03 09:55:34 +01001422 int nocommit = how & FLUSH_NOCOMMIT;
Trond Myklebust3f442542006-09-17 14:46:44 -04001423 long pages, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
Trond Myklebust1c759502006-10-09 16:18:38 -04001425 /* FIXME */
1426 if (wbc->range_cyclic)
1427 idx_start = 0;
1428 else {
1429 idx_start = wbc->range_start >> PAGE_CACHE_SHIFT;
1430 idx_end = wbc->range_end >> PAGE_CACHE_SHIFT;
1431 if (idx_end > idx_start) {
Trond Myklebustca52fec2007-04-17 17:22:13 -04001432 pgoff_t l_npages = 1 + idx_end - idx_start;
Trond Myklebust1c759502006-10-09 16:18:38 -04001433 npages = l_npages;
1434 if (sizeof(npages) != sizeof(l_npages) &&
Trond Myklebustca52fec2007-04-17 17:22:13 -04001435 (pgoff_t)npages != l_npages)
Trond Myklebust1c759502006-10-09 16:18:38 -04001436 npages = 0;
1437 }
1438 }
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001439 how &= ~FLUSH_NOCOMMIT;
Trond Myklebust587142f2007-07-02 09:57:54 -04001440 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 do {
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001442 ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
1443 if (ret != 0)
Trond Myklebust70b9ecb2006-01-03 09:55:34 +01001444 continue;
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001445 if (nocommit)
1446 break;
Trond Myklebustd2ccddf2006-05-31 01:13:38 -04001447 pages = nfs_scan_commit(inode, &head, idx_start, npages);
Trond Myklebust724c4392007-04-17 17:22:13 -04001448 if (pages == 0)
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001449 break;
Trond Myklebustd2ccddf2006-05-31 01:13:38 -04001450 if (how & FLUSH_INVALIDATE) {
Trond Myklebust587142f2007-07-02 09:57:54 -04001451 spin_unlock(&inode->i_lock);
Trond Myklebust83715ad2006-07-05 13:17:12 -04001452 nfs_cancel_commit_list(&head);
Trond Myklebuste8e058e2006-11-15 17:31:56 -05001453 ret = pages;
Trond Myklebust587142f2007-07-02 09:57:54 -04001454 spin_lock(&inode->i_lock);
Trond Myklebustd2ccddf2006-05-31 01:13:38 -04001455 continue;
1456 }
1457 pages += nfs_scan_commit(inode, &head, 0, 0);
Trond Myklebust587142f2007-07-02 09:57:54 -04001458 spin_unlock(&inode->i_lock);
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001459 ret = nfs_commit_list(inode, &head, how);
Trond Myklebust587142f2007-07-02 09:57:54 -04001460 spin_lock(&inode->i_lock);
1461
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001462 } while (ret >= 0);
Trond Myklebust587142f2007-07-02 09:57:54 -04001463 spin_unlock(&inode->i_lock);
Trond Myklebustc42de9d2006-03-20 13:44:51 -05001464 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465}
1466
Trond Myklebust34901f72007-07-25 14:09:54 -04001467static int __nfs_write_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
Trond Myklebust1c759502006-10-09 16:18:38 -04001468{
Trond Myklebust1c759502006-10-09 16:18:38 -04001469 int ret;
1470
Trond Myklebust34901f72007-07-25 14:09:54 -04001471 ret = nfs_writepages(mapping, wbc);
Trond Myklebust61822ab2006-12-05 00:35:42 -05001472 if (ret < 0)
1473 goto out;
Trond Myklebust34901f72007-07-25 14:09:54 -04001474 ret = nfs_sync_mapping_wait(mapping, wbc, how);
Trond Myklebusted90ef52007-07-20 13:13:28 -04001475 if (ret < 0)
1476 goto out;
1477 return 0;
Trond Myklebust61822ab2006-12-05 00:35:42 -05001478out:
Trond Myklebuste507d9e2006-12-05 00:35:42 -05001479 __mark_inode_dirty(mapping->host, I_DIRTY_PAGES);
Trond Myklebust1c759502006-10-09 16:18:38 -04001480 return ret;
1481}
1482
Trond Myklebust34901f72007-07-25 14:09:54 -04001483/* Two pass sync: first using WB_SYNC_NONE, then WB_SYNC_ALL */
1484static int nfs_write_mapping(struct address_space *mapping, int how)
1485{
1486 struct writeback_control wbc = {
1487 .bdi = mapping->backing_dev_info,
Trond Myklebust72cb77f2009-03-11 14:10:30 -04001488 .sync_mode = WB_SYNC_ALL,
Trond Myklebust34901f72007-07-25 14:09:54 -04001489 .nr_to_write = LONG_MAX,
Trond Myklebustd7fb1202008-10-06 20:08:56 -04001490 .range_start = 0,
1491 .range_end = LLONG_MAX,
Trond Myklebust34901f72007-07-25 14:09:54 -04001492 };
Trond Myklebust34901f72007-07-25 14:09:54 -04001493
Trond Myklebust34901f72007-07-25 14:09:54 -04001494 return __nfs_write_mapping(mapping, &wbc, how);
1495}
1496
Trond Myklebusted90ef52007-07-20 13:13:28 -04001497/*
1498 * flush the inode to disk.
1499 */
1500int nfs_wb_all(struct inode *inode)
Trond Myklebust1c759502006-10-09 16:18:38 -04001501{
Trond Myklebusted90ef52007-07-20 13:13:28 -04001502 return nfs_write_mapping(inode->i_mapping, 0);
1503}
Trond Myklebust1c759502006-10-09 16:18:38 -04001504
Trond Myklebusted90ef52007-07-20 13:13:28 -04001505int nfs_wb_nocommit(struct inode *inode)
1506{
1507 return nfs_write_mapping(inode->i_mapping, FLUSH_NOCOMMIT);
Trond Myklebust1c759502006-10-09 16:18:38 -04001508}
1509
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001510int nfs_wb_page_cancel(struct inode *inode, struct page *page)
1511{
1512 struct nfs_page *req;
1513 loff_t range_start = page_offset(page);
1514 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
1515 struct writeback_control wbc = {
1516 .bdi = page->mapping->backing_dev_info,
1517 .sync_mode = WB_SYNC_ALL,
1518 .nr_to_write = LONG_MAX,
1519 .range_start = range_start,
1520 .range_end = range_end,
1521 };
1522 int ret = 0;
1523
1524 BUG_ON(!PageLocked(page));
1525 for (;;) {
1526 req = nfs_page_find_request(page);
1527 if (req == NULL)
1528 goto out;
Trond Myklebuste468bae2008-06-13 13:25:22 -04001529 if (test_bit(PG_CLEAN, &req->wb_flags)) {
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001530 nfs_release_request(req);
1531 break;
1532 }
1533 if (nfs_lock_request_dontget(req)) {
1534 nfs_inode_remove_request(req);
1535 /*
1536 * In case nfs_inode_remove_request has marked the
1537 * page as being dirty
1538 */
1539 cancel_dirty_page(page, PAGE_CACHE_SIZE);
1540 nfs_unlock_request(req);
1541 break;
1542 }
1543 ret = nfs_wait_on_request(req);
Trond Myklebustc9edda72010-01-26 15:41:34 -05001544 nfs_release_request(req);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001545 if (ret < 0)
1546 goto out;
1547 }
1548 if (!PagePrivate(page))
1549 return 0;
1550 ret = nfs_sync_mapping_wait(page->mapping, &wbc, FLUSH_INVALIDATE);
1551out:
1552 return ret;
1553}
1554
Adrian Bunk5334eb12007-11-21 15:04:31 -08001555static int nfs_wb_page_priority(struct inode *inode, struct page *page,
1556 int how)
Trond Myklebust1c759502006-10-09 16:18:38 -04001557{
1558 loff_t range_start = page_offset(page);
1559 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001560 struct writeback_control wbc = {
1561 .bdi = page->mapping->backing_dev_info,
1562 .sync_mode = WB_SYNC_ALL,
1563 .nr_to_write = LONG_MAX,
1564 .range_start = range_start,
1565 .range_end = range_end,
1566 };
1567 int ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001568
Trond Myklebust73e33022008-04-11 16:03:54 -04001569 do {
1570 if (clear_page_dirty_for_io(page)) {
1571 ret = nfs_writepage_locked(page, &wbc);
1572 if (ret < 0)
1573 goto out_error;
1574 } else if (!PagePrivate(page))
1575 break;
1576 ret = nfs_sync_mapping_wait(page->mapping, &wbc, how);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001577 if (ret < 0)
Trond Myklebust73e33022008-04-11 16:03:54 -04001578 goto out_error;
1579 } while (PagePrivate(page));
1580 return 0;
1581out_error:
Trond Myklebuste507d9e2006-12-05 00:35:42 -05001582 __mark_inode_dirty(inode, I_DIRTY_PAGES);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001583 return ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001584}
1585
1586/*
1587 * Write back all requests on one page - we do this before reading it.
1588 */
1589int nfs_wb_page(struct inode *inode, struct page* page)
1590{
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001591 return nfs_wb_page_priority(inode, page, FLUSH_STABLE);
Trond Myklebust1c759502006-10-09 16:18:38 -04001592}
1593
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001594#ifdef CONFIG_MIGRATION
1595int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
1596 struct page *page)
1597{
1598 struct nfs_page *req;
1599 int ret;
1600
1601 if (PageFsCache(page))
1602 nfs_fscache_release_page(page, GFP_KERNEL);
1603
1604 req = nfs_find_and_lock_request(page);
1605 ret = PTR_ERR(req);
1606 if (IS_ERR(req))
1607 goto out;
1608
1609 ret = migrate_page(mapping, newpage, page);
1610 if (!req)
1611 goto out;
1612 if (ret)
1613 goto out_unlock;
1614 page_cache_get(newpage);
Trond Myklebust190f38e2009-12-10 09:05:55 -05001615 spin_lock(&mapping->host->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001616 req->wb_page = newpage;
1617 SetPagePrivate(newpage);
Trond Myklebust190f38e2009-12-10 09:05:55 -05001618 set_page_private(newpage, (unsigned long)req);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001619 ClearPagePrivate(page);
1620 set_page_private(page, 0);
Trond Myklebust190f38e2009-12-10 09:05:55 -05001621 spin_unlock(&mapping->host->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001622 page_cache_release(page);
1623out_unlock:
1624 nfs_clear_page_tag_locked(req);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001625out:
1626 return ret;
1627}
1628#endif
1629
David Howellsf7b422b2006-06-09 09:34:33 -04001630int __init nfs_init_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631{
1632 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
1633 sizeof(struct nfs_write_data),
1634 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001635 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 if (nfs_wdata_cachep == NULL)
1637 return -ENOMEM;
1638
Matthew Dobson93d23412006-03-26 01:37:50 -08001639 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1640 nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 if (nfs_wdata_mempool == NULL)
1642 return -ENOMEM;
1643
Matthew Dobson93d23412006-03-26 01:37:50 -08001644 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
1645 nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 if (nfs_commit_mempool == NULL)
1647 return -ENOMEM;
1648
Peter Zijlstra89a09142007-03-16 13:38:26 -08001649 /*
1650 * NFS congestion size, scale with available memory.
1651 *
1652 * 64MB: 8192k
1653 * 128MB: 11585k
1654 * 256MB: 16384k
1655 * 512MB: 23170k
1656 * 1GB: 32768k
1657 * 2GB: 46340k
1658 * 4GB: 65536k
1659 * 8GB: 92681k
1660 * 16GB: 131072k
1661 *
1662 * This allows larger machines to have larger/more transfers.
1663 * Limit the default to 256M
1664 */
1665 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
1666 if (nfs_congestion_kb > 256*1024)
1667 nfs_congestion_kb = 256*1024;
1668
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 return 0;
1670}
1671
David Brownell266bee82006-06-27 12:59:15 -07001672void nfs_destroy_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673{
1674 mempool_destroy(nfs_commit_mempool);
1675 mempool_destroy(nfs_wdata_mempool);
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001676 kmem_cache_destroy(nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001677}
1678