blob: 49c715b4ac927b9bbd283e0f991118d34bf9af10 [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"
Fred Isaman94ad1c82011-03-01 01:34:14 +000031#include "pnfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
33#define NFSDBG_FACILITY NFSDBG_PAGECACHE
34
35#define MIN_POOL_WRITE (32)
36#define MIN_POOL_COMMIT (4)
37
38/*
39 * Local function declarations
40 */
Trond Myklebustc63c7b02007-04-02 19:29:52 -040041static void nfs_pageio_init_write(struct nfs_pageio_descriptor *desc,
42 struct inode *inode, int ioflags);
Fred Isamanf8512ad2008-03-19 11:24:39 -040043static void nfs_redirty_request(struct nfs_page *req);
Trond Myklebust788e7a82006-03-20 13:44:27 -050044static const struct rpc_call_ops nfs_write_partial_ops;
45static const struct rpc_call_ops nfs_write_full_ops;
46static const struct rpc_call_ops nfs_commit_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
Christoph Lametere18b8902006-12-06 20:33:20 -080048static struct kmem_cache *nfs_wdata_cachep;
Trond Myklebust3feb2d42006-03-20 13:44:37 -050049static mempool_t *nfs_wdata_mempool;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050static mempool_t *nfs_commit_mempool;
51
Trond Myklebustc9d8f892008-04-15 16:56:39 -040052struct nfs_write_data *nfs_commitdata_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070053{
Christoph Lametere6b4f8d2006-12-06 20:33:14 -080054 struct nfs_write_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOFS);
Chuck Lever40859d72005-11-30 18:09:02 -050055
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 if (p) {
57 memset(p, 0, sizeof(*p));
58 INIT_LIST_HEAD(&p->pages);
59 }
60 return p;
61}
Fred Isamane0c2b382011-03-23 13:27:53 +000062EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Trond Myklebust5e4424a2008-02-25 21:53:49 -080064void nfs_commit_free(struct nfs_write_data *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070065{
Chuck Lever40859d72005-11-30 18:09:02 -050066 if (p && (p->pagevec != &p->page_array[0]))
67 kfree(p->pagevec);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 mempool_free(p, nfs_commit_mempool);
69}
Fred Isamane0c2b382011-03-23 13:27:53 +000070EXPORT_SYMBOL_GPL(nfs_commit_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Trond Myklebust8d5658c2007-04-10 09:26:35 -040072struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
Trond Myklebust3feb2d42006-03-20 13:44:37 -050073{
Christoph Lametere6b4f8d2006-12-06 20:33:14 -080074 struct nfs_write_data *p = mempool_alloc(nfs_wdata_mempool, GFP_NOFS);
Trond Myklebust3feb2d42006-03-20 13:44:37 -050075
76 if (p) {
77 memset(p, 0, sizeof(*p));
78 INIT_LIST_HEAD(&p->pages);
Trond Myklebuste9f7bee2006-09-08 09:48:54 -070079 p->npages = pagecount;
Chuck Lever0d0b5cb2006-05-25 01:40:53 -040080 if (pagecount <= ARRAY_SIZE(p->page_array))
81 p->pagevec = p->page_array;
Trond Myklebust3feb2d42006-03-20 13:44:37 -050082 else {
Chuck Lever0d0b5cb2006-05-25 01:40:53 -040083 p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
84 if (!p->pagevec) {
Trond Myklebust3feb2d42006-03-20 13:44:37 -050085 mempool_free(p, nfs_wdata_mempool);
86 p = NULL;
87 }
88 }
89 }
90 return p;
91}
92
Trond Myklebust1ae88b22009-08-12 09:12:30 -040093void nfs_writedata_free(struct nfs_write_data *p)
Trond Myklebust3feb2d42006-03-20 13:44:37 -050094{
95 if (p && (p->pagevec != &p->page_array[0]))
96 kfree(p->pagevec);
97 mempool_free(p, nfs_wdata_mempool);
98}
99
Trond Myklebust1ae88b22009-08-12 09:12:30 -0400100static void nfs_writedata_release(struct nfs_write_data *wdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
Fred Isaman5053aa52011-03-03 15:13:43 +0000102 put_lseg(wdata->lseg);
Trond Myklebust383ba712008-02-19 20:04:20 -0500103 put_nfs_open_context(wdata->args.context);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 nfs_writedata_free(wdata);
105}
106
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400107static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
108{
109 ctx->error = error;
110 smp_wmb();
111 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
112}
113
Trond Myklebust277459d2006-12-05 00:35:35 -0500114static struct nfs_page *nfs_page_find_request_locked(struct page *page)
115{
116 struct nfs_page *req = NULL;
117
118 if (PagePrivate(page)) {
119 req = (struct nfs_page *)page_private(page);
120 if (req != NULL)
Trond Myklebustc03b4022007-06-17 13:26:38 -0400121 kref_get(&req->wb_kref);
Trond Myklebust277459d2006-12-05 00:35:35 -0500122 }
123 return req;
124}
125
126static struct nfs_page *nfs_page_find_request(struct page *page)
127{
Trond Myklebust587142f2007-07-02 09:57:54 -0400128 struct inode *inode = page->mapping->host;
Trond Myklebust277459d2006-12-05 00:35:35 -0500129 struct nfs_page *req = NULL;
Trond Myklebust277459d2006-12-05 00:35:35 -0500130
Trond Myklebust587142f2007-07-02 09:57:54 -0400131 spin_lock(&inode->i_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500132 req = nfs_page_find_request_locked(page);
Trond Myklebust587142f2007-07-02 09:57:54 -0400133 spin_unlock(&inode->i_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500134 return req;
135}
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137/* Adjust the file length if we're writing beyond the end */
138static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
139{
140 struct inode *inode = page->mapping->host;
Trond Myklebusta3d01452008-06-11 12:21:19 -0400141 loff_t end, i_size;
142 pgoff_t end_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Trond Myklebusta3d01452008-06-11 12:21:19 -0400144 spin_lock(&inode->i_lock);
145 i_size = i_size_read(inode);
146 end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 if (i_size > 0 && page->index < end_index)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400148 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
150 if (i_size >= end)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400151 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 i_size_write(inode, end);
Trond Myklebusta3d01452008-06-11 12:21:19 -0400153 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
154out:
155 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
Trond Myklebusta301b772007-02-06 11:07:15 -0800158/* A writeback failed: mark the page as bad, and invalidate the page cache */
159static void nfs_set_pageerror(struct page *page)
160{
161 SetPageError(page);
162 nfs_zap_mapping(page->mapping->host, page->mapping);
163}
164
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165/* We can set the PG_uptodate flag if we see that a write request
166 * covers the full page.
167 */
168static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
169{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (PageUptodate(page))
171 return;
172 if (base != 0)
173 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500174 if (count != nfs_page_length(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500176 SetPageUptodate(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179static int wb_priority(struct writeback_control *wbc)
180{
181 if (wbc->for_reclaim)
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400182 return FLUSH_HIGHPRI | FLUSH_STABLE;
Wu Fengguangb17621f2009-12-03 13:54:25 +0100183 if (wbc->for_kupdate || wbc->for_background)
Trond Myklebustb31268a2011-03-21 17:02:00 -0400184 return FLUSH_LOWPRI | FLUSH_COND_STABLE;
185 return FLUSH_COND_STABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
188/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800189 * NFS congestion control
190 */
191
192int nfs_congestion_kb;
193
194#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
195#define NFS_CONGESTION_OFF_THRESH \
196 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
197
Trond Myklebust5a6d41b2007-04-14 19:10:12 -0400198static int nfs_set_page_writeback(struct page *page)
Peter Zijlstra89a09142007-03-16 13:38:26 -0800199{
Trond Myklebust5a6d41b2007-04-14 19:10:12 -0400200 int ret = test_set_page_writeback(page);
201
202 if (!ret) {
Peter Zijlstra89a09142007-03-16 13:38:26 -0800203 struct inode *inode = page->mapping->host;
204 struct nfs_server *nfss = NFS_SERVER(inode);
205
Trond Myklebusta6305dd2010-04-09 19:07:08 -0400206 page_cache_get(page);
Peter Zijlstra277866a2007-05-08 00:35:12 -0700207 if (atomic_long_inc_return(&nfss->writeback) >
Jens Axboe8aa7e842009-07-09 14:52:32 +0200208 NFS_CONGESTION_ON_THRESH) {
209 set_bdi_congested(&nfss->backing_dev_info,
210 BLK_RW_ASYNC);
211 }
Peter Zijlstra89a09142007-03-16 13:38:26 -0800212 }
Trond Myklebust5a6d41b2007-04-14 19:10:12 -0400213 return ret;
Peter Zijlstra89a09142007-03-16 13:38:26 -0800214}
215
216static void nfs_end_page_writeback(struct page *page)
217{
218 struct inode *inode = page->mapping->host;
219 struct nfs_server *nfss = NFS_SERVER(inode);
220
221 end_page_writeback(page);
Trond Myklebusta6305dd2010-04-09 19:07:08 -0400222 page_cache_release(page);
Peter Zijlstrac4dc4be2007-10-16 23:25:41 -0700223 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
Jens Axboe8aa7e842009-07-09 14:52:32 +0200224 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800225}
226
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400227static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
Trond Myklebuste261f512006-12-05 00:35:41 -0500228{
Trond Myklebust587142f2007-07-02 09:57:54 -0400229 struct inode *inode = page->mapping->host;
Trond Myklebuste261f512006-12-05 00:35:41 -0500230 struct nfs_page *req;
Trond Myklebuste261f512006-12-05 00:35:41 -0500231 int ret;
232
Trond Myklebust587142f2007-07-02 09:57:54 -0400233 spin_lock(&inode->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400234 for (;;) {
Trond Myklebuste261f512006-12-05 00:35:41 -0500235 req = nfs_page_find_request_locked(page);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400236 if (req == NULL)
237 break;
Trond Myklebustacee4782008-01-22 17:13:07 -0500238 if (nfs_set_page_tag_locked(req))
Trond Myklebuste261f512006-12-05 00:35:41 -0500239 break;
240 /* Note: If we hold the page lock, as is the case in nfs_writepage,
Trond Myklebustacee4782008-01-22 17:13:07 -0500241 * then the call to nfs_set_page_tag_locked() will always
Trond Myklebuste261f512006-12-05 00:35:41 -0500242 * succeed provided that someone hasn't already marked the
243 * request as dirty (in which case we don't care).
244 */
Trond Myklebust587142f2007-07-02 09:57:54 -0400245 spin_unlock(&inode->i_lock);
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400246 if (!nonblock)
247 ret = nfs_wait_on_request(req);
248 else
249 ret = -EAGAIN;
Trond Myklebuste261f512006-12-05 00:35:41 -0500250 nfs_release_request(req);
251 if (ret != 0)
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400252 return ERR_PTR(ret);
Trond Myklebust587142f2007-07-02 09:57:54 -0400253 spin_lock(&inode->i_lock);
Trond Myklebuste261f512006-12-05 00:35:41 -0500254 }
Trond Myklebust587142f2007-07-02 09:57:54 -0400255 spin_unlock(&inode->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400256 return req;
257}
258
259/*
260 * Find an associated nfs write request, and prepare to flush it out
261 * May return an error if the user signalled nfs_wait_on_request().
262 */
263static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400264 struct page *page, bool nonblock)
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400265{
266 struct nfs_page *req;
267 int ret = 0;
268
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400269 req = nfs_find_and_lock_request(page, nonblock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400270 if (!req)
271 goto out;
272 ret = PTR_ERR(req);
273 if (IS_ERR(req))
274 goto out;
275
276 ret = nfs_set_page_writeback(page);
277 BUG_ON(ret != 0);
278 BUG_ON(test_bit(PG_CLEAN, &req->wb_flags));
279
Fred Isamanf8512ad2008-03-19 11:24:39 -0400280 if (!nfs_pageio_add_request(pgio, req)) {
281 nfs_redirty_request(req);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400282 ret = pgio->pg_error;
Fred Isamanf8512ad2008-03-19 11:24:39 -0400283 }
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400284out:
285 return ret;
Trond Myklebuste261f512006-12-05 00:35:41 -0500286}
287
Trond Myklebustf758c8852007-07-22 19:27:32 -0400288static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
289{
290 struct inode *inode = page->mapping->host;
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400291 int ret;
Trond Myklebustf758c8852007-07-22 19:27:32 -0400292
293 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
294 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
295
296 nfs_pageio_cond_complete(pgio, page->index);
Wu Fengguang1b430be2010-10-26 14:21:26 -0700297 ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400298 if (ret == -EAGAIN) {
299 redirty_page_for_writepage(wbc, page);
300 ret = 0;
301 }
302 return ret;
Trond Myklebustf758c8852007-07-22 19:27:32 -0400303}
304
Trond Myklebuste261f512006-12-05 00:35:41 -0500305/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 * Write an mmapped page to the server.
307 */
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500308static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400310 struct nfs_pageio_descriptor pgio;
Trond Myklebuste261f512006-12-05 00:35:41 -0500311 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Trond Myklebustf758c8852007-07-22 19:27:32 -0400313 nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc));
314 err = nfs_do_writepage(page, wbc, &pgio);
315 nfs_pageio_complete(&pgio);
316 if (err < 0)
317 return err;
318 if (pgio.pg_error < 0)
319 return pgio.pg_error;
320 return 0;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500321}
322
323int nfs_writepage(struct page *page, struct writeback_control *wbc)
324{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400325 int ret;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500326
Trond Myklebustf758c8852007-07-22 19:27:32 -0400327 ret = nfs_writepage_locked(page, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 unlock_page(page);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400329 return ret;
330}
331
332static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
333{
334 int ret;
335
336 ret = nfs_do_writepage(page, wbc, data);
337 unlock_page(page);
338 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339}
340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
342{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 struct inode *inode = mapping->host;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400344 unsigned long *bitlock = &NFS_I(inode)->flags;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400345 struct nfs_pageio_descriptor pgio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 int err;
347
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400348 /* Stop dirtying of new pages while we sync */
349 err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
350 nfs_wait_bit_killable, TASK_KILLABLE);
351 if (err)
352 goto out_err;
353
Chuck Lever91d5b472006-03-20 13:44:14 -0500354 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
355
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400356 nfs_pageio_init_write(&pgio, inode, wb_priority(wbc));
Trond Myklebustf758c8852007-07-22 19:27:32 -0400357 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400358 nfs_pageio_complete(&pgio);
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400359
360 clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
361 smp_mb__after_clear_bit();
362 wake_up_bit(bitlock, NFS_INO_FLUSHING);
363
Trond Myklebustf758c8852007-07-22 19:27:32 -0400364 if (err < 0)
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400365 goto out_err;
366 err = pgio.pg_error;
367 if (err < 0)
368 goto out_err;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400369 return 0;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400370out_err:
371 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372}
373
374/*
375 * Insert a write request into an inode
376 */
Trond Myklebuste7d39062008-06-13 12:12:32 -0400377static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378{
379 struct nfs_inode *nfsi = NFS_I(inode);
380 int error;
381
Trond Myklebuste7d39062008-06-13 12:12:32 -0400382 error = radix_tree_preload(GFP_NOFS);
383 if (error != 0)
384 goto out;
385
386 /* Lock the request! */
387 nfs_lock_request_dontget(req);
388
389 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req);
Nick Piggin27852592008-02-04 23:48:37 -0800391 BUG_ON(error);
Trond Myklebust4d65c522011-03-25 14:15:11 -0400392 if (!nfsi->npages && nfs_have_delegation(inode, FMODE_WRITE))
393 nfsi->change_attr++;
Trond Myklebust2df485a2010-12-07 22:39:17 -0500394 set_bit(PG_MAPPED, &req->wb_flags);
Trond Myklebustdeb7d632006-03-20 13:44:50 -0500395 SetPagePrivate(req->wb_page);
Trond Myklebust277459d2006-12-05 00:35:35 -0500396 set_page_private(req->wb_page, (unsigned long)req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 nfsi->npages++;
Trond Myklebustc03b4022007-06-17 13:26:38 -0400398 kref_get(&req->wb_kref);
Nick Piggin27852592008-02-04 23:48:37 -0800399 radix_tree_tag_set(&nfsi->nfs_page_tree, req->wb_index,
400 NFS_PAGE_TAG_LOCKED);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400401 spin_unlock(&inode->i_lock);
402 radix_tree_preload_end();
403out:
404 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405}
406
407/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800408 * Remove a write request from an inode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 */
410static void nfs_inode_remove_request(struct nfs_page *req)
411{
Trond Myklebust88be9f92007-06-05 10:42:27 -0400412 struct inode *inode = req->wb_context->path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 struct nfs_inode *nfsi = NFS_I(inode);
414
415 BUG_ON (!NFS_WBACK_BUSY(req));
416
Trond Myklebust587142f2007-07-02 09:57:54 -0400417 spin_lock(&inode->i_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500418 set_page_private(req->wb_page, 0);
Trond Myklebustdeb7d632006-03-20 13:44:50 -0500419 ClearPagePrivate(req->wb_page);
Trond Myklebust2df485a2010-12-07 22:39:17 -0500420 clear_bit(PG_MAPPED, &req->wb_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 radix_tree_delete(&nfsi->nfs_page_tree, req->wb_index);
422 nfsi->npages--;
Trond Myklebust4d65c522011-03-25 14:15:11 -0400423 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 nfs_release_request(req);
425}
426
Trond Myklebust61822ab2006-12-05 00:35:42 -0500427static void
Fred6d884e82008-03-19 11:24:38 -0400428nfs_mark_request_dirty(struct nfs_page *req)
Trond Myklebust61822ab2006-12-05 00:35:42 -0500429{
Trond Myklebust61822ab2006-12-05 00:35:42 -0500430 __set_page_dirty_nobuffers(req->wb_page);
Trond Myklebustb80c3cb2010-04-09 19:07:07 -0400431 __mark_inode_dirty(req->wb_page->mapping->host, I_DIRTY_DATASYNC);
Trond Myklebust61822ab2006-12-05 00:35:42 -0500432}
433
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
435/*
436 * Add a request to the inode's commit list.
437 */
438static void
Fred Isamana861a1e2011-03-23 13:27:51 +0000439nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440{
Trond Myklebust88be9f92007-06-05 10:42:27 -0400441 struct inode *inode = req->wb_context->path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 struct nfs_inode *nfsi = NFS_I(inode);
443
Trond Myklebust587142f2007-07-02 09:57:54 -0400444 spin_lock(&inode->i_lock);
Trond Myklebuste468bae2008-06-13 13:25:22 -0400445 set_bit(PG_CLEAN, &(req)->wb_flags);
Trond Myklebust5c369682007-06-17 15:27:42 -0400446 radix_tree_tag_set(&nfsi->nfs_page_tree,
447 req->wb_index,
448 NFS_PAGE_TAG_COMMIT);
Trond Myklebustff778d02010-02-19 16:53:39 -0800449 nfsi->ncommit++;
Trond Myklebust587142f2007-07-02 09:57:54 -0400450 spin_unlock(&inode->i_lock);
Fred Isamana861a1e2011-03-23 13:27:51 +0000451 pnfs_mark_request_commit(req, lseg);
Christoph Lameterfd39fc82006-06-30 01:55:40 -0700452 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Peter Zijlstrac9e51e42007-10-16 23:25:47 -0700453 inc_bdi_stat(req->wb_page->mapping->backing_dev_info, BDI_RECLAIMABLE);
Trond Myklebusta1803042006-12-05 00:45:19 -0500454 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455}
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400456
Trond Myklebuste468bae2008-06-13 13:25:22 -0400457static int
458nfs_clear_request_commit(struct nfs_page *req)
459{
460 struct page *page = req->wb_page;
461
462 if (test_and_clear_bit(PG_CLEAN, &(req)->wb_flags)) {
463 dec_zone_page_state(page, NR_UNSTABLE_NFS);
464 dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE);
465 return 1;
466 }
467 return 0;
468}
469
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400470static inline
471int nfs_write_need_commit(struct nfs_write_data *data)
472{
Fred Isaman465d5242011-03-23 13:27:44 +0000473 if (data->verf.committed == NFS_DATA_SYNC)
474 return data->lseg == NULL;
475 else
476 return data->verf.committed != NFS_FILE_SYNC;
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400477}
478
479static inline
Fred Isamana861a1e2011-03-23 13:27:51 +0000480int nfs_reschedule_unstable_write(struct nfs_page *req,
481 struct nfs_write_data *data)
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400482{
Trond Myklebuste468bae2008-06-13 13:25:22 -0400483 if (test_and_clear_bit(PG_NEED_COMMIT, &req->wb_flags)) {
Fred Isamana861a1e2011-03-23 13:27:51 +0000484 nfs_mark_request_commit(req, data->lseg);
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400485 return 1;
486 }
487 if (test_and_clear_bit(PG_NEED_RESCHED, &req->wb_flags)) {
Fred6d884e82008-03-19 11:24:38 -0400488 nfs_mark_request_dirty(req);
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400489 return 1;
490 }
491 return 0;
492}
493#else
494static inline void
Fred Isamana861a1e2011-03-23 13:27:51 +0000495nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg)
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400496{
497}
498
Trond Myklebuste468bae2008-06-13 13:25:22 -0400499static inline int
500nfs_clear_request_commit(struct nfs_page *req)
501{
502 return 0;
503}
504
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400505static inline
506int nfs_write_need_commit(struct nfs_write_data *data)
507{
508 return 0;
509}
510
511static inline
Fred Isamana861a1e2011-03-23 13:27:51 +0000512int nfs_reschedule_unstable_write(struct nfs_page *req,
513 struct nfs_write_data *data)
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400514{
515 return 0;
516}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517#endif
518
Trond Myklebust47c62562009-03-16 08:13:41 -0400519#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400520static int
521nfs_need_commit(struct nfs_inode *nfsi)
522{
523 return radix_tree_tagged(&nfsi->nfs_page_tree, NFS_PAGE_TAG_COMMIT);
524}
525
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526/*
527 * nfs_scan_commit - Scan an inode for commit requests
528 * @inode: NFS inode to scan
529 * @dst: destination list
530 * @idx_start: lower bound of page->index to scan.
531 * @npages: idx_start + npages sets the upper bound to scan.
532 *
533 * Moves requests from the inode's 'commit' request list.
534 * The requests are *not* checked to ensure that they form a contiguous set.
535 */
536static int
Trond Myklebustca52fec2007-04-17 17:22:13 -0400537nfs_scan_commit(struct inode *inode, struct list_head *dst, pgoff_t idx_start, unsigned int npages)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
539 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebustff778d02010-02-19 16:53:39 -0800540 int ret;
Trond Myklebust3da28eb2005-06-22 17:16:31 +0000541
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400542 if (!nfs_need_commit(nfsi))
543 return 0;
544
Dave Chinner0d88f6e2011-04-12 19:18:08 +1000545 spin_lock(&inode->i_lock);
Trond Myklebustff778d02010-02-19 16:53:39 -0800546 ret = nfs_scan_list(nfsi, dst, idx_start, npages, NFS_PAGE_TAG_COMMIT);
547 if (ret > 0)
548 nfsi->ncommit -= ret;
Dave Chinner0d88f6e2011-04-12 19:18:08 +1000549 spin_unlock(&inode->i_lock);
550
Trond Myklebust2928db12010-02-19 17:03:18 -0800551 if (nfs_need_commit(NFS_I(inode)))
552 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
Dave Chinner0d88f6e2011-04-12 19:18:08 +1000553
Trond Myklebustff778d02010-02-19 16:53:39 -0800554 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555}
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500556#else
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400557static inline int nfs_need_commit(struct nfs_inode *nfsi)
558{
559 return 0;
560}
561
Trond Myklebustca52fec2007-04-17 17:22:13 -0400562static 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 -0500563{
564 return 0;
565}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566#endif
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568/*
Trond Myklebuste7d39062008-06-13 12:12:32 -0400569 * Search for an existing write request, and attempt to update
570 * it to reflect a new dirty region on a given page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 *
Trond Myklebuste7d39062008-06-13 12:12:32 -0400572 * If the attempt fails, then the existing request is flushed out
573 * to disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 */
Trond Myklebuste7d39062008-06-13 12:12:32 -0400575static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
576 struct page *page,
577 unsigned int offset,
578 unsigned int bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579{
Trond Myklebuste7d39062008-06-13 12:12:32 -0400580 struct nfs_page *req;
581 unsigned int rqend;
582 unsigned int end;
583 int error;
584
585 if (!PagePrivate(page))
586 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
588 end = offset + bytes;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400589 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 for (;;) {
Trond Myklebust277459d2006-12-05 00:35:35 -0500592 req = nfs_page_find_request_locked(page);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400593 if (req == NULL)
594 goto out_unlock;
Trond Myklebust277459d2006-12-05 00:35:35 -0500595
Trond Myklebuste7d39062008-06-13 12:12:32 -0400596 rqend = req->wb_offset + req->wb_bytes;
597 /*
598 * Tell the caller to flush out the request if
599 * the offsets are non-contiguous.
600 * Note: nfs_flush_incompatible() will already
601 * have flushed out requests having wrong owners.
602 */
Trond Myklebuste468bae2008-06-13 13:25:22 -0400603 if (offset > rqend
Trond Myklebuste7d39062008-06-13 12:12:32 -0400604 || end < req->wb_offset)
605 goto out_flushme;
606
607 if (nfs_set_page_tag_locked(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
Trond Myklebuste7d39062008-06-13 12:12:32 -0400610 /* The request is locked, so wait and then retry */
Trond Myklebust587142f2007-07-02 09:57:54 -0400611 spin_unlock(&inode->i_lock);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400612 error = nfs_wait_on_request(req);
613 nfs_release_request(req);
614 if (error != 0)
615 goto out_err;
616 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 }
618
Trond Myklebustff778d02010-02-19 16:53:39 -0800619 if (nfs_clear_request_commit(req) &&
Fred Isamana861a1e2011-03-23 13:27:51 +0000620 radix_tree_tag_clear(&NFS_I(inode)->nfs_page_tree,
621 req->wb_index, NFS_PAGE_TAG_COMMIT) != NULL) {
Trond Myklebustff778d02010-02-19 16:53:39 -0800622 NFS_I(inode)->ncommit--;
Fred Isamana861a1e2011-03-23 13:27:51 +0000623 pnfs_clear_request_commit(req);
624 }
Trond Myklebuste468bae2008-06-13 13:25:22 -0400625
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 /* Okay, the request matches. Update the region */
627 if (offset < req->wb_offset) {
628 req->wb_offset = offset;
629 req->wb_pgbase = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 if (end > rqend)
632 req->wb_bytes = end - req->wb_offset;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400633 else
634 req->wb_bytes = rqend - req->wb_offset;
635out_unlock:
636 spin_unlock(&inode->i_lock);
637 return req;
638out_flushme:
639 spin_unlock(&inode->i_lock);
640 nfs_release_request(req);
641 error = nfs_wb_page(inode, page);
642out_err:
643 return ERR_PTR(error);
644}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Trond Myklebuste7d39062008-06-13 12:12:32 -0400646/*
647 * Try to update an existing write request, or create one if there is none.
648 *
649 * Note: Should always be called with the Page Lock held to prevent races
650 * if we have to add a new request. Also assumes that the caller has
651 * already called nfs_flush_incompatible() if necessary.
652 */
653static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
654 struct page *page, unsigned int offset, unsigned int bytes)
655{
656 struct inode *inode = page->mapping->host;
657 struct nfs_page *req;
658 int error;
659
660 req = nfs_try_to_update_request(inode, page, offset, bytes);
661 if (req != NULL)
662 goto out;
663 req = nfs_create_request(ctx, inode, page, offset, bytes);
664 if (IS_ERR(req))
665 goto out;
666 error = nfs_inode_add_request(inode, req);
667 if (error != 0) {
668 nfs_release_request(req);
669 req = ERR_PTR(error);
670 }
Trond Myklebustefc91ed2008-06-10 18:31:00 -0400671out:
Trond Myklebust61e930a2007-10-18 17:08:05 -0400672 return req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673}
674
Trond Myklebuste7d39062008-06-13 12:12:32 -0400675static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
676 unsigned int offset, unsigned int count)
677{
678 struct nfs_page *req;
679
680 req = nfs_setup_write_request(ctx, page, offset, count);
681 if (IS_ERR(req))
682 return PTR_ERR(req);
683 /* Update file length */
684 nfs_grow_file(page, offset, count);
685 nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
Trond Myklebusta6305dd2010-04-09 19:07:08 -0400686 nfs_mark_request_dirty(req);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400687 nfs_clear_page_tag_locked(req);
688 return 0;
689}
690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691int nfs_flush_incompatible(struct file *file, struct page *page)
692{
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400693 struct nfs_open_context *ctx = nfs_file_open_context(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 struct nfs_page *req;
Trond Myklebust1a545332006-12-05 00:35:40 -0500695 int do_flush, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 /*
697 * Look for a request corresponding to this page. If there
698 * is one, and it belongs to another file, we flush it out
699 * before we try to copy anything into the page. Do this
700 * due to the lack of an ACCESS-type call in NFSv2.
701 * Also do the same if we find a request from an existing
702 * dropped page.
703 */
Trond Myklebust1a545332006-12-05 00:35:40 -0500704 do {
705 req = nfs_page_find_request(page);
706 if (req == NULL)
707 return 0;
Trond Myklebustf11ac8d2010-06-25 16:35:53 -0400708 do_flush = req->wb_page != page || req->wb_context != ctx ||
709 req->wb_lock_context->lockowner != current->files ||
710 req->wb_lock_context->pid != current->tgid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 nfs_release_request(req);
Trond Myklebust1a545332006-12-05 00:35:40 -0500712 if (!do_flush)
713 return 0;
714 status = nfs_wb_page(page->mapping->host, page);
715 } while (status == 0);
716 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717}
718
719/*
Trond Myklebust5d47a352008-02-07 17:24:07 -0500720 * If the page cache is marked as unsafe or invalid, then we can't rely on
721 * the PageUptodate() flag. In this case, we will need to turn off
722 * write optimisations that depend on the page contents being correct.
723 */
724static int nfs_write_pageuptodate(struct page *page, struct inode *inode)
725{
726 return PageUptodate(page) &&
727 !(NFS_I(inode)->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_DATA));
728}
729
730/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 * Update and possibly write a cached page of an NFS file.
732 *
733 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
734 * things with a page scheduled for an RPC call (e.g. invalidate it).
735 */
736int nfs_updatepage(struct file *file, struct page *page,
737 unsigned int offset, unsigned int count)
738{
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400739 struct nfs_open_context *ctx = nfs_file_open_context(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 struct inode *inode = page->mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 int status = 0;
742
Chuck Lever91d5b472006-03-20 13:44:14 -0500743 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
744
Chuck Lever48186c72008-06-11 17:56:05 -0400745 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800746 file->f_path.dentry->d_parent->d_name.name,
747 file->f_path.dentry->d_name.name, count,
Chuck Lever48186c72008-06-11 17:56:05 -0400748 (long long)(page_offset(page) + offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 /* If we're not using byte range locks, and we know the page
Trond Myklebust5d47a352008-02-07 17:24:07 -0500751 * is up to date, it may be more efficient to extend the write
752 * to cover the entire page in order to avoid fragmentation
753 * inefficiencies.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 */
Trond Myklebust5d47a352008-02-07 17:24:07 -0500755 if (nfs_write_pageuptodate(page, inode) &&
756 inode->i_flock == NULL &&
Christoph Hellwig6b2f3d12009-10-27 11:05:28 +0100757 !(file->f_flags & O_DSYNC)) {
Trond Myklebust49a70f22006-12-05 00:35:38 -0500758 count = max(count + offset, nfs_page_length(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760 }
761
Trond Myklebuste21195a2006-12-05 00:35:39 -0500762 status = nfs_writepage_setup(ctx, page, offset, count);
Trond Myklebust03fa9e82008-06-05 16:02:35 -0400763 if (status < 0)
764 nfs_set_pageerror(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
Chuck Lever48186c72008-06-11 17:56:05 -0400766 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 status, (long long)i_size_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 return status;
769}
770
Fred Isamana861a1e2011-03-23 13:27:51 +0000771static void nfs_writepage_release(struct nfs_page *req,
772 struct nfs_write_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773{
Trond Myklebusta6305dd2010-04-09 19:07:08 -0400774 struct page *page = req->wb_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775
Fred Isamana861a1e2011-03-23 13:27:51 +0000776 if (PageError(req->wb_page) || !nfs_reschedule_unstable_write(req, data))
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400777 nfs_inode_remove_request(req);
Trond Myklebust9fd367f2007-06-17 15:10:24 -0400778 nfs_clear_page_tag_locked(req);
Trond Myklebusta6305dd2010-04-09 19:07:08 -0400779 nfs_end_page_writeback(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780}
781
Trond Myklebust3ff75762007-07-14 15:40:00 -0400782static int flush_task_priority(int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783{
784 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
785 case FLUSH_HIGHPRI:
786 return RPC_PRIORITY_HIGH;
787 case FLUSH_LOWPRI:
788 return RPC_PRIORITY_LOW;
789 }
790 return RPC_PRIORITY_NORMAL;
791}
792
Fred Isamana69aef12011-03-03 15:13:47 +0000793int nfs_initiate_write(struct nfs_write_data *data,
Andy Adamsond138d5d2011-03-03 15:13:41 +0000794 struct rpc_clnt *clnt,
795 const struct rpc_call_ops *call_ops,
796 int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797{
Andy Adamsond138d5d2011-03-03 15:13:41 +0000798 struct inode *inode = data->inode;
Trond Myklebust3ff75762007-07-14 15:40:00 -0400799 int priority = flush_task_priority(how);
Trond Myklebust07737692007-10-25 18:42:54 -0400800 struct rpc_task *task;
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400801 struct rpc_message msg = {
802 .rpc_argp = &data->args,
803 .rpc_resp = &data->res,
Andy Adamsond138d5d2011-03-03 15:13:41 +0000804 .rpc_cred = data->cred,
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400805 };
Trond Myklebust84115e12007-07-14 15:39:59 -0400806 struct rpc_task_setup task_setup_data = {
Andy Adamsond138d5d2011-03-03 15:13:41 +0000807 .rpc_client = clnt,
Trond Myklebust07737692007-10-25 18:42:54 -0400808 .task = &data->task,
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400809 .rpc_message = &msg,
Trond Myklebust84115e12007-07-14 15:39:59 -0400810 .callback_ops = call_ops,
811 .callback_data = data,
Trond Myklebust101070c2008-02-19 20:04:23 -0500812 .workqueue = nfsiod_workqueue,
Trond Myklebust2c61be02010-04-09 19:54:50 -0400813 .flags = RPC_TASK_ASYNC,
Trond Myklebust3ff75762007-07-14 15:40:00 -0400814 .priority = priority,
Trond Myklebust84115e12007-07-14 15:39:59 -0400815 };
Trond Myklebust2c61be02010-04-09 19:54:50 -0400816 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
Andy Adamsond138d5d2011-03-03 15:13:41 +0000818 /* Set up the initial task struct. */
819 NFS_PROTO(inode)->write_setup(data, &msg);
820
821 dprintk("NFS: %5u initiated write call "
822 "(req %s/%lld, %u bytes @ offset %llu)\n",
823 data->task.tk_pid,
824 inode->i_sb->s_id,
825 (long long)NFS_FILEID(inode),
826 data->args.count,
827 (unsigned long long)data->args.offset);
828
829 task = rpc_run_task(&task_setup_data);
830 if (IS_ERR(task)) {
831 ret = PTR_ERR(task);
832 goto out;
833 }
834 if (how & FLUSH_SYNC) {
835 ret = rpc_wait_for_completion_task(task);
836 if (ret == 0)
837 ret = task->tk_status;
838 }
839 rpc_put_task(task);
840out:
841 return ret;
842}
Fred Isamana69aef12011-03-03 15:13:47 +0000843EXPORT_SYMBOL_GPL(nfs_initiate_write);
Andy Adamsond138d5d2011-03-03 15:13:41 +0000844
845/*
846 * Set up the argument/result storage required for the RPC call.
847 */
848static int nfs_write_rpcsetup(struct nfs_page *req,
849 struct nfs_write_data *data,
850 const struct rpc_call_ops *call_ops,
851 unsigned int count, unsigned int offset,
Fred Isaman5053aa52011-03-03 15:13:43 +0000852 struct pnfs_layout_segment *lseg,
Andy Adamsond138d5d2011-03-03 15:13:41 +0000853 int how)
854{
855 struct inode *inode = req->wb_context->path.dentry->d_inode;
856
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 /* Set up the RPC argument and reply structs
858 * NB: take care not to mess about with data->commit et al. */
859
860 data->req = req;
Trond Myklebust88be9f92007-06-05 10:42:27 -0400861 data->inode = inode = req->wb_context->path.dentry->d_inode;
Andy Adamsond138d5d2011-03-03 15:13:41 +0000862 data->cred = req->wb_context->cred;
Fred Isaman5053aa52011-03-03 15:13:43 +0000863 data->lseg = get_lseg(lseg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
865 data->args.fh = NFS_FH(inode);
866 data->args.offset = req_offset(req) + offset;
867 data->args.pgbase = req->wb_pgbase + offset;
868 data->args.pages = data->pagevec;
869 data->args.count = count;
Trond Myklebust383ba712008-02-19 20:04:20 -0500870 data->args.context = get_nfs_open_context(req->wb_context);
Trond Myklebustf11ac8d2010-06-25 16:35:53 -0400871 data->args.lock_context = req->wb_lock_context;
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400872 data->args.stable = NFS_UNSTABLE;
Trond Myklebustb31268a2011-03-21 17:02:00 -0400873 if (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400874 data->args.stable = NFS_DATA_SYNC;
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400875 if (!nfs_need_commit(NFS_I(inode)))
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400876 data->args.stable = NFS_FILE_SYNC;
877 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878
879 data->res.fattr = &data->fattr;
880 data->res.count = count;
881 data->res.verf = &data->verf;
Trond Myklebust0e574af2005-10-27 22:12:38 -0400882 nfs_fattr_init(&data->fattr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Andy Adamson0382b742011-03-03 15:13:45 +0000884 if (data->lseg &&
885 (pnfs_try_to_write_data(data, call_ops, how) == PNFS_ATTEMPTED))
886 return 0;
887
Andy Adamsond138d5d2011-03-03 15:13:41 +0000888 return nfs_initiate_write(data, NFS_CLIENT(inode), call_ops, how);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889}
890
Fred6d884e82008-03-19 11:24:38 -0400891/* If a nfs_flush_* function fails, it should remove reqs from @head and
892 * call this on each, which will prepare them to be retried on next
893 * writeback using standard nfs.
894 */
895static void nfs_redirty_request(struct nfs_page *req)
896{
Trond Myklebusta6305dd2010-04-09 19:07:08 -0400897 struct page *page = req->wb_page;
898
Fred6d884e82008-03-19 11:24:38 -0400899 nfs_mark_request_dirty(req);
Fred6d884e82008-03-19 11:24:38 -0400900 nfs_clear_page_tag_locked(req);
Trond Myklebusta6305dd2010-04-09 19:07:08 -0400901 nfs_end_page_writeback(page);
Fred6d884e82008-03-19 11:24:38 -0400902}
903
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904/*
905 * Generate multiple small requests to write out a single
906 * contiguous dirty area on one page.
907 */
Fred Isamanc76069b2011-03-03 15:13:48 +0000908static int nfs_flush_multi(struct nfs_pageio_descriptor *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909{
Fred Isamanc76069b2011-03-03 15:13:48 +0000910 struct nfs_page *req = nfs_list_entry(desc->pg_list.next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 struct page *page = req->wb_page;
912 struct nfs_write_data *data;
Fred Isamanc76069b2011-03-03 15:13:48 +0000913 size_t wsize = NFS_SERVER(desc->pg_inode)->wsize, nbytes;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700914 unsigned int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 int requests = 0;
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400916 int ret = 0;
Fred Isamanc76069b2011-03-03 15:13:48 +0000917 struct pnfs_layout_segment *lseg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 LIST_HEAD(list);
919
920 nfs_list_remove_request(req);
921
Trond Myklebustb31268a2011-03-21 17:02:00 -0400922 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
923 (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit ||
924 desc->pg_count > wsize))
925 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
926
927
Fred Isamanc76069b2011-03-03 15:13:48 +0000928 nbytes = desc->pg_count;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700929 do {
930 size_t len = min(nbytes, wsize);
931
Trond Myklebust8d5658c2007-04-10 09:26:35 -0400932 data = nfs_writedata_alloc(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 if (!data)
934 goto out_bad;
935 list_add(&data->pages, &list);
936 requests++;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -0700937 nbytes -= len;
938 } while (nbytes != 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 atomic_set(&req->wb_complete, requests);
940
Fred Isamanc76069b2011-03-03 15:13:48 +0000941 BUG_ON(desc->pg_lseg);
Trond Myklebusta75b9df2011-05-11 18:00:51 -0400942 lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_RW, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 ClearPageError(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 offset = 0;
Fred Isamanc76069b2011-03-03 15:13:48 +0000945 nbytes = desc->pg_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946 do {
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400947 int ret2;
948
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 data = list_entry(list.next, struct nfs_write_data, pages);
950 list_del_init(&data->pages);
951
952 data->pagevec[0] = page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400954 if (nbytes < wsize)
955 wsize = nbytes;
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400956 ret2 = nfs_write_rpcsetup(req, data, &nfs_write_partial_ops,
Fred Isamanc76069b2011-03-03 15:13:48 +0000957 wsize, offset, lseg, desc->pg_ioflags);
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400958 if (ret == 0)
959 ret = ret2;
Trond Myklebustbcb71bb2007-04-02 18:48:28 -0400960 offset += wsize;
961 nbytes -= wsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 } while (nbytes != 0);
963
Fred Isaman44b83792011-03-03 15:13:44 +0000964 put_lseg(lseg);
Fred Isaman36fe4322011-03-03 15:13:49 +0000965 desc->pg_lseg = NULL;
Trond Myklebustdbae4c72008-04-14 14:54:53 -0400966 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
968out_bad:
969 while (!list_empty(&list)) {
970 data = list_entry(list.next, struct nfs_write_data, pages);
971 list_del(&data->pages);
Fred Isaman0da2a4ac2011-01-19 14:18:50 -0500972 nfs_writedata_free(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 }
Trond Myklebust61822ab2006-12-05 00:35:42 -0500974 nfs_redirty_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 return -ENOMEM;
976}
977
978/*
979 * Create an RPC task for the given write request and kick it.
980 * The page must have been locked by the caller.
981 *
982 * It may happen that the page we're passed is not marked dirty.
983 * This is the case if nfs_updatepage detects a conflicting request
984 * that has been written but not committed.
985 */
Fred Isamanc76069b2011-03-03 15:13:48 +0000986static int nfs_flush_one(struct nfs_pageio_descriptor *desc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987{
988 struct nfs_page *req;
989 struct page **pages;
990 struct nfs_write_data *data;
Fred Isamanc76069b2011-03-03 15:13:48 +0000991 struct list_head *head = &desc->pg_list;
992 struct pnfs_layout_segment *lseg = desc->pg_lseg;
Fred Isaman44b83792011-03-03 15:13:44 +0000993 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994
Fred Isamanc76069b2011-03-03 15:13:48 +0000995 data = nfs_writedata_alloc(nfs_page_array_len(desc->pg_base,
996 desc->pg_count));
Fred Isaman44b83792011-03-03 15:13:44 +0000997 if (!data) {
998 while (!list_empty(head)) {
999 req = nfs_list_entry(head->next);
1000 nfs_list_remove_request(req);
1001 nfs_redirty_request(req);
1002 }
1003 ret = -ENOMEM;
1004 goto out;
1005 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 pages = data->pagevec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 while (!list_empty(head)) {
1008 req = nfs_list_entry(head->next);
1009 nfs_list_remove_request(req);
1010 nfs_list_add_request(req, &data->pages);
1011 ClearPageError(req->wb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 *pages++ = req->wb_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 }
1014 req = nfs_list_entry(data->pages.next);
Fred Isaman44b83792011-03-03 15:13:44 +00001015 if ((!lseg) && list_is_singular(&data->pages))
Trond Myklebusta75b9df2011-05-11 18:00:51 -04001016 lseg = pnfs_update_layout(desc->pg_inode, req->wb_context, IOMODE_RW, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017
Trond Myklebustb31268a2011-03-21 17:02:00 -04001018 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
1019 (desc->pg_moreio || NFS_I(desc->pg_inode)->ncommit))
1020 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1021
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 /* Set up the argument struct */
Fred Isamanc76069b2011-03-03 15:13:48 +00001023 ret = nfs_write_rpcsetup(req, data, &nfs_write_full_ops, desc->pg_count, 0, lseg, desc->pg_ioflags);
Fred Isaman44b83792011-03-03 15:13:44 +00001024out:
1025 put_lseg(lseg); /* Cleans any gotten in ->pg_test */
Fred Isaman36fe4322011-03-03 15:13:49 +00001026 desc->pg_lseg = NULL;
Fred Isaman44b83792011-03-03 15:13:44 +00001027 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028}
1029
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001030static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
1031 struct inode *inode, int ioflags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032{
Chuck Leverbf4285e2007-12-20 14:54:57 -05001033 size_t wsize = NFS_SERVER(inode)->wsize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
Fred Isaman44b83792011-03-03 15:13:44 +00001035 pnfs_pageio_init_write(pgio, inode);
Fred Isaman94ad1c82011-03-01 01:34:14 +00001036
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001037 if (wsize < PAGE_CACHE_SIZE)
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001038 nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags);
Trond Myklebustbcb71bb2007-04-02 18:48:28 -04001039 else
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001040 nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041}
1042
1043/*
1044 * Handle a write reply that flushed part of a page.
1045 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001046static void nfs_writeback_done_partial(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047{
Trond Myklebust788e7a82006-03-20 13:44:27 -05001048 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049
Chuck Lever48186c72008-06-11 17:56:05 -04001050 dprintk("NFS: %5u write(%s/%lld %d@%lld)",
1051 task->tk_pid,
1052 data->req->wb_context->path.dentry->d_inode->i_sb->s_id,
1053 (long long)
1054 NFS_FILEID(data->req->wb_context->path.dentry->d_inode),
1055 data->req->wb_bytes, (long long)req_offset(data->req));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001057 nfs_writeback_done(task, data);
1058}
Trond Myklebust788e7a82006-03-20 13:44:27 -05001059
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001060static void nfs_writeback_release_partial(void *calldata)
1061{
1062 struct nfs_write_data *data = calldata;
1063 struct nfs_page *req = data->req;
1064 struct page *page = req->wb_page;
1065 int status = data->task.tk_status;
1066
1067 if (status < 0) {
Trond Myklebusta301b772007-02-06 11:07:15 -08001068 nfs_set_pageerror(page);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001069 nfs_context_set_write_error(req->wb_context, status);
1070 dprintk(", error = %d\n", status);
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001071 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 }
1073
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001074 if (nfs_write_need_commit(data)) {
Trond Myklebust587142f2007-07-02 09:57:54 -04001075 struct inode *inode = page->mapping->host;
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001076
Trond Myklebust587142f2007-07-02 09:57:54 -04001077 spin_lock(&inode->i_lock);
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001078 if (test_bit(PG_NEED_RESCHED, &req->wb_flags)) {
1079 /* Do nothing we need to resend the writes */
1080 } else if (!test_and_set_bit(PG_NEED_COMMIT, &req->wb_flags)) {
1081 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
1082 dprintk(" defer commit\n");
1083 } else if (memcmp(&req->wb_verf, &data->verf, sizeof(req->wb_verf))) {
1084 set_bit(PG_NEED_RESCHED, &req->wb_flags);
1085 clear_bit(PG_NEED_COMMIT, &req->wb_flags);
1086 dprintk(" server reboot detected\n");
1087 }
Trond Myklebust587142f2007-07-02 09:57:54 -04001088 spin_unlock(&inode->i_lock);
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001089 } else
1090 dprintk(" OK\n");
1091
1092out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 if (atomic_dec_and_test(&req->wb_complete))
Fred Isamana861a1e2011-03-23 13:27:51 +00001094 nfs_writepage_release(req, data);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001095 nfs_writedata_release(calldata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096}
1097
Andy Adamsondef6ed72009-04-01 09:22:26 -04001098#if defined(CONFIG_NFS_V4_1)
1099void nfs_write_prepare(struct rpc_task *task, void *calldata)
1100{
1101 struct nfs_write_data *data = calldata;
Andy Adamsondef6ed72009-04-01 09:22:26 -04001102
Trond Myklebust035168a2010-06-16 09:52:26 -04001103 if (nfs4_setup_sequence(NFS_SERVER(data->inode),
1104 &data->args.seq_args,
Andy Adamsondef6ed72009-04-01 09:22:26 -04001105 &data->res.seq_res, 1, task))
1106 return;
1107 rpc_call_start(task);
1108}
1109#endif /* CONFIG_NFS_V4_1 */
1110
Trond Myklebust788e7a82006-03-20 13:44:27 -05001111static const struct rpc_call_ops nfs_write_partial_ops = {
Andy Adamsondef6ed72009-04-01 09:22:26 -04001112#if defined(CONFIG_NFS_V4_1)
1113 .rpc_call_prepare = nfs_write_prepare,
1114#endif /* CONFIG_NFS_V4_1 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001115 .rpc_call_done = nfs_writeback_done_partial,
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001116 .rpc_release = nfs_writeback_release_partial,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001117};
1118
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119/*
1120 * Handle a write reply that flushes a whole page.
1121 *
1122 * FIXME: There is an inherent race with invalidate_inode_pages and
1123 * writebacks since the page->count is kept > 1 for as long
1124 * as the page has a write request pending.
1125 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001126static void nfs_writeback_done_full(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127{
Trond Myklebust788e7a82006-03-20 13:44:27 -05001128 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001130 nfs_writeback_done(task, data);
1131}
1132
1133static void nfs_writeback_release_full(void *calldata)
1134{
1135 struct nfs_write_data *data = calldata;
1136 int status = data->task.tk_status;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001137
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 /* Update attributes as result of writeback. */
1139 while (!list_empty(&data->pages)) {
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001140 struct nfs_page *req = nfs_list_entry(data->pages.next);
1141 struct page *page = req->wb_page;
1142
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 nfs_list_remove_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144
Chuck Lever48186c72008-06-11 17:56:05 -04001145 dprintk("NFS: %5u write (%s/%lld %d@%lld)",
1146 data->task.tk_pid,
Trond Myklebust88be9f92007-06-05 10:42:27 -04001147 req->wb_context->path.dentry->d_inode->i_sb->s_id,
1148 (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 req->wb_bytes,
1150 (long long)req_offset(req));
1151
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001152 if (status < 0) {
Trond Myklebusta301b772007-02-06 11:07:15 -08001153 nfs_set_pageerror(page);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001154 nfs_context_set_write_error(req->wb_context, status);
1155 dprintk(", error = %d\n", status);
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001156 goto remove_request;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001159 if (nfs_write_need_commit(data)) {
1160 memcpy(&req->wb_verf, &data->verf, sizeof(req->wb_verf));
Fred Isamana861a1e2011-03-23 13:27:51 +00001161 nfs_mark_request_commit(req, data->lseg);
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001162 dprintk(" marked for commit\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 goto next;
1164 }
Trond Myklebust8e821ca2007-04-20 16:12:34 -04001165 dprintk(" OK\n");
1166remove_request:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 nfs_inode_remove_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 next:
Trond Myklebust9fd367f2007-06-17 15:10:24 -04001169 nfs_clear_page_tag_locked(req);
Trond Myklebusta6305dd2010-04-09 19:07:08 -04001170 nfs_end_page_writeback(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 }
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001172 nfs_writedata_release(calldata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173}
1174
Trond Myklebust788e7a82006-03-20 13:44:27 -05001175static const struct rpc_call_ops nfs_write_full_ops = {
Andy Adamsondef6ed72009-04-01 09:22:26 -04001176#if defined(CONFIG_NFS_V4_1)
1177 .rpc_call_prepare = nfs_write_prepare,
1178#endif /* CONFIG_NFS_V4_1 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001179 .rpc_call_done = nfs_writeback_done_full,
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001180 .rpc_release = nfs_writeback_release_full,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001181};
1182
1183
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184/*
1185 * This function is called when the WRITE call is complete.
1186 */
Fred Isaman13602892011-02-11 15:42:38 +00001187void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 struct nfs_writeargs *argp = &data->args;
1190 struct nfs_writeres *resp = &data->res;
Andy Adamsoneedc0202009-04-01 09:22:41 -04001191 struct nfs_server *server = NFS_SERVER(data->inode);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001192 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193
Chuck Levera3f565b2007-01-31 12:14:01 -05001194 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195 task->tk_pid, task->tk_status);
1196
Chuck Leverf551e442006-09-20 14:33:04 -04001197 /*
1198 * ->write_done will attempt to use post-op attributes to detect
1199 * conflicting writes by other clients. A strict interpretation
1200 * of close-to-open would allow us to continue caching even if
1201 * another writer had changed the file, but some applications
1202 * depend on tighter cache coherency when writing.
1203 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001204 status = NFS_PROTO(data->inode)->write_done(task, data);
1205 if (status != 0)
Fred Isaman13602892011-02-11 15:42:38 +00001206 return;
Chuck Lever91d5b472006-03-20 13:44:14 -05001207 nfs_add_stats(data->inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
1208
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
1210 if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
1211 /* We tried a write call, but the server did not
1212 * commit data to stable storage even though we
1213 * requested it.
1214 * Note: There is a known bug in Tru64 < 5.0 in which
1215 * the server reports NFS_DATA_SYNC, but performs
1216 * NFS_FILE_SYNC. We therefore implement this checking
1217 * as a dprintk() in order to avoid filling syslog.
1218 */
1219 static unsigned long complain;
1220
Fred Isamana69aef12011-03-03 15:13:47 +00001221 /* Note this will print the MDS for a DS write */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 if (time_before(complain, jiffies)) {
Chuck Lever48186c72008-06-11 17:56:05 -04001223 dprintk("NFS: faulty NFS server %s:"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 " (committed = %d) != (stable = %d)\n",
Andy Adamsoneedc0202009-04-01 09:22:41 -04001225 server->nfs_client->cl_hostname,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 resp->verf->committed, argp->stable);
1227 complain = jiffies + 300 * HZ;
1228 }
1229 }
1230#endif
1231 /* Is this a short write? */
1232 if (task->tk_status >= 0 && resp->count < argp->count) {
1233 static unsigned long complain;
1234
Chuck Lever91d5b472006-03-20 13:44:14 -05001235 nfs_inc_stats(data->inode, NFSIOS_SHORTWRITE);
1236
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 /* Has the server at least made some progress? */
1238 if (resp->count != 0) {
1239 /* Was this an NFSv2 write or an NFSv3 stable write? */
1240 if (resp->verf->committed != NFS_UNSTABLE) {
1241 /* Resend from where the server left off */
Fred Isamana69aef12011-03-03 15:13:47 +00001242 data->mds_offset += resp->count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 argp->offset += resp->count;
1244 argp->pgbase += resp->count;
1245 argp->count -= resp->count;
1246 } else {
1247 /* Resend as a stable write in order to avoid
1248 * headaches in the case of a server crash.
1249 */
1250 argp->stable = NFS_FILE_SYNC;
1251 }
Trond Myklebust0110ee12009-12-07 09:00:24 -05001252 nfs_restart_rpc(task, server->nfs_client);
Fred Isaman13602892011-02-11 15:42:38 +00001253 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 }
1255 if (time_before(complain, jiffies)) {
1256 printk(KERN_WARNING
1257 "NFS: Server wrote zero bytes, expected %u.\n",
1258 argp->count);
1259 complain = jiffies + 300 * HZ;
1260 }
1261 /* Can't do anything about it except throw an error. */
1262 task->tk_status = -EIO;
1263 }
Fred Isaman13602892011-02-11 15:42:38 +00001264 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265}
1266
1267
1268#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
Trond Myklebust71d0a612010-04-22 15:35:57 -04001269static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
1270{
Trond Myklebustb8413f92011-03-21 15:37:01 -04001271 int ret;
1272
Trond Myklebust71d0a612010-04-22 15:35:57 -04001273 if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags))
1274 return 1;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001275 if (!may_wait)
1276 return 0;
1277 ret = out_of_line_wait_on_bit_lock(&nfsi->flags,
1278 NFS_INO_COMMIT,
1279 nfs_wait_bit_killable,
1280 TASK_KILLABLE);
1281 return (ret < 0) ? ret : 1;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001282}
1283
Fred Isamane0c2b382011-03-23 13:27:53 +00001284void nfs_commit_clear_lock(struct nfs_inode *nfsi)
Trond Myklebust71d0a612010-04-22 15:35:57 -04001285{
1286 clear_bit(NFS_INO_COMMIT, &nfsi->flags);
1287 smp_mb__after_clear_bit();
1288 wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
1289}
Fred Isamane0c2b382011-03-23 13:27:53 +00001290EXPORT_SYMBOL_GPL(nfs_commit_clear_lock);
Trond Myklebust71d0a612010-04-22 15:35:57 -04001291
Fred Isamane0c2b382011-03-23 13:27:53 +00001292void nfs_commitdata_release(void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293{
Trond Myklebust383ba712008-02-19 20:04:20 -05001294 struct nfs_write_data *wdata = data;
1295
Fred Isaman988b6dc2011-03-23 13:27:52 +00001296 put_lseg(wdata->lseg);
Trond Myklebust383ba712008-02-19 20:04:20 -05001297 put_nfs_open_context(wdata->args.context);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298 nfs_commit_free(wdata);
1299}
Fred Isamane0c2b382011-03-23 13:27:53 +00001300EXPORT_SYMBOL_GPL(nfs_commitdata_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301
Fred Isamane0c2b382011-03-23 13:27:53 +00001302int nfs_initiate_commit(struct nfs_write_data *data, struct rpc_clnt *clnt,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001303 const struct rpc_call_ops *call_ops,
1304 int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305{
Trond Myklebust07737692007-10-25 18:42:54 -04001306 struct rpc_task *task;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001307 int priority = flush_task_priority(how);
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001308 struct rpc_message msg = {
1309 .rpc_argp = &data->args,
1310 .rpc_resp = &data->res,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001311 .rpc_cred = data->cred,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001312 };
Trond Myklebust84115e12007-07-14 15:39:59 -04001313 struct rpc_task_setup task_setup_data = {
Trond Myklebust07737692007-10-25 18:42:54 -04001314 .task = &data->task,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001315 .rpc_client = clnt,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001316 .rpc_message = &msg,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001317 .callback_ops = call_ops,
Trond Myklebust84115e12007-07-14 15:39:59 -04001318 .callback_data = data,
Trond Myklebust101070c2008-02-19 20:04:23 -05001319 .workqueue = nfsiod_workqueue,
Trond Myklebust2c61be02010-04-09 19:54:50 -04001320 .flags = RPC_TASK_ASYNC,
Trond Myklebust3ff75762007-07-14 15:40:00 -04001321 .priority = priority,
Trond Myklebust84115e12007-07-14 15:39:59 -04001322 };
Trond Myklebust788e7a82006-03-20 13:44:27 -05001323 /* Set up the initial task struct. */
Fred Isaman9ace33c2011-03-23 13:27:45 +00001324 NFS_PROTO(data->inode)->commit_setup(data, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325
Chuck Levera3f565b2007-01-31 12:14:01 -05001326 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001327
Trond Myklebust07737692007-10-25 18:42:54 -04001328 task = rpc_run_task(&task_setup_data);
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001329 if (IS_ERR(task))
1330 return PTR_ERR(task);
Jeff Laytond2224e72011-03-06 17:14:13 +00001331 if (how & FLUSH_SYNC)
1332 rpc_wait_for_completion_task(task);
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001333 rpc_put_task(task);
1334 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335}
Fred Isamane0c2b382011-03-23 13:27:53 +00001336EXPORT_SYMBOL_GPL(nfs_initiate_commit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337
1338/*
Fred Isaman9ace33c2011-03-23 13:27:45 +00001339 * Set up the argument/result storage required for the RPC call.
1340 */
Fred Isamane0c2b382011-03-23 13:27:53 +00001341void nfs_init_commit(struct nfs_write_data *data,
Fred Isaman988b6dc2011-03-23 13:27:52 +00001342 struct list_head *head,
1343 struct pnfs_layout_segment *lseg)
Fred Isaman9ace33c2011-03-23 13:27:45 +00001344{
1345 struct nfs_page *first = nfs_list_entry(head->next);
1346 struct inode *inode = first->wb_context->path.dentry->d_inode;
1347
1348 /* Set up the RPC argument and reply structs
1349 * NB: take care not to mess about with data->commit et al. */
1350
1351 list_splice_init(head, &data->pages);
1352
1353 data->inode = inode;
1354 data->cred = first->wb_context->cred;
Fred Isaman988b6dc2011-03-23 13:27:52 +00001355 data->lseg = lseg; /* reference transferred */
Fred Isaman9ace33c2011-03-23 13:27:45 +00001356 data->mds_ops = &nfs_commit_ops;
1357
1358 data->args.fh = NFS_FH(data->inode);
1359 /* Note: we always request a commit of the entire inode */
1360 data->args.offset = 0;
1361 data->args.count = 0;
1362 data->args.context = get_nfs_open_context(first->wb_context);
1363 data->res.count = 0;
1364 data->res.fattr = &data->fattr;
1365 data->res.verf = &data->verf;
1366 nfs_fattr_init(&data->fattr);
1367}
Fred Isamane0c2b382011-03-23 13:27:53 +00001368EXPORT_SYMBOL_GPL(nfs_init_commit);
Fred Isaman9ace33c2011-03-23 13:27:45 +00001369
Fred Isamane0c2b382011-03-23 13:27:53 +00001370void nfs_retry_commit(struct list_head *page_list,
Fred Isamana861a1e2011-03-23 13:27:51 +00001371 struct pnfs_layout_segment *lseg)
Fred Isaman64bfeb42011-03-23 13:27:47 +00001372{
1373 struct nfs_page *req;
1374
1375 while (!list_empty(page_list)) {
1376 req = nfs_list_entry(page_list->next);
1377 nfs_list_remove_request(req);
Fred Isamana861a1e2011-03-23 13:27:51 +00001378 nfs_mark_request_commit(req, lseg);
Fred Isaman64bfeb42011-03-23 13:27:47 +00001379 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
1380 dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
1381 BDI_RECLAIMABLE);
1382 nfs_clear_page_tag_locked(req);
1383 }
1384}
Fred Isamane0c2b382011-03-23 13:27:53 +00001385EXPORT_SYMBOL_GPL(nfs_retry_commit);
Fred Isaman64bfeb42011-03-23 13:27:47 +00001386
Fred Isaman9ace33c2011-03-23 13:27:45 +00001387/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 * Commit dirty pages
1389 */
1390static int
Chuck Lever40859d72005-11-30 18:09:02 -05001391nfs_commit_list(struct inode *inode, struct list_head *head, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392{
1393 struct nfs_write_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001395 data = nfs_commitdata_alloc();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
1397 if (!data)
1398 goto out_bad;
1399
1400 /* Set up the argument struct */
Fred Isaman988b6dc2011-03-23 13:27:52 +00001401 nfs_init_commit(data, head, NULL);
Fred Isaman9ace33c2011-03-23 13:27:45 +00001402 return nfs_initiate_commit(data, NFS_CLIENT(inode), data->mds_ops, how);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 out_bad:
Fred Isamana861a1e2011-03-23 13:27:51 +00001404 nfs_retry_commit(head, NULL);
Trond Myklebust71d0a612010-04-22 15:35:57 -04001405 nfs_commit_clear_lock(NFS_I(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 return -ENOMEM;
1407}
1408
1409/*
1410 * COMMIT call returned
1411 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001412static void nfs_commit_done(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413{
Trond Myklebust963d8fe2006-01-03 09:55:04 +01001414 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415
Chuck Levera3f565b2007-01-31 12:14:01 -05001416 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417 task->tk_pid, task->tk_status);
1418
Trond Myklebust788e7a82006-03-20 13:44:27 -05001419 /* Call the NFS version-specific code */
Trond Myklebustc0d0e962011-04-12 12:29:15 -04001420 NFS_PROTO(data->inode)->commit_done(task, data);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001421}
1422
Fred Isamane0c2b382011-03-23 13:27:53 +00001423void nfs_commit_release_pages(struct nfs_write_data *data)
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001424{
Fred Isaman5917ce82011-03-23 13:27:48 +00001425 struct nfs_page *req;
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001426 int status = data->task.tk_status;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001427
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 while (!list_empty(&data->pages)) {
1429 req = nfs_list_entry(data->pages.next);
1430 nfs_list_remove_request(req);
Trond Myklebuste468bae2008-06-13 13:25:22 -04001431 nfs_clear_request_commit(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432
Chuck Lever48186c72008-06-11 17:56:05 -04001433 dprintk("NFS: commit (%s/%lld %d@%lld)",
Trond Myklebust88be9f92007-06-05 10:42:27 -04001434 req->wb_context->path.dentry->d_inode->i_sb->s_id,
1435 (long long)NFS_FILEID(req->wb_context->path.dentry->d_inode),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 req->wb_bytes,
1437 (long long)req_offset(req));
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001438 if (status < 0) {
1439 nfs_context_set_write_error(req->wb_context, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 nfs_inode_remove_request(req);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001441 dprintk(", error = %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 goto next;
1443 }
1444
1445 /* Okay, COMMIT succeeded, apparently. Check the verifier
1446 * returned by the server against all stored verfs. */
1447 if (!memcmp(req->wb_verf.verifier, data->verf.verifier, sizeof(data->verf.verifier))) {
1448 /* We have a match */
1449 nfs_inode_remove_request(req);
1450 dprintk(" OK\n");
1451 goto next;
1452 }
1453 /* We have a mismatch. Write the page again */
1454 dprintk(" mismatch\n");
Fred6d884e82008-03-19 11:24:38 -04001455 nfs_mark_request_dirty(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456 next:
Trond Myklebust9fd367f2007-06-17 15:10:24 -04001457 nfs_clear_page_tag_locked(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 }
Fred Isaman5917ce82011-03-23 13:27:48 +00001459}
Fred Isamane0c2b382011-03-23 13:27:53 +00001460EXPORT_SYMBOL_GPL(nfs_commit_release_pages);
Fred Isaman5917ce82011-03-23 13:27:48 +00001461
1462static void nfs_commit_release(void *calldata)
1463{
1464 struct nfs_write_data *data = calldata;
1465
1466 nfs_commit_release_pages(data);
Trond Myklebust71d0a612010-04-22 15:35:57 -04001467 nfs_commit_clear_lock(NFS_I(data->inode));
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001468 nfs_commitdata_release(calldata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469}
Trond Myklebust788e7a82006-03-20 13:44:27 -05001470
1471static const struct rpc_call_ops nfs_commit_ops = {
Andy Adamson21d9a852009-04-01 09:22:27 -04001472#if defined(CONFIG_NFS_V4_1)
1473 .rpc_call_prepare = nfs_write_prepare,
1474#endif /* CONFIG_NFS_V4_1 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001475 .rpc_call_done = nfs_commit_done,
1476 .rpc_release = nfs_commit_release,
1477};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478
Trond Myklebustb608b282010-07-30 15:31:54 -04001479int nfs_commit_inode(struct inode *inode, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481 LIST_HEAD(head);
Trond Myklebust71d0a612010-04-22 15:35:57 -04001482 int may_wait = how & FLUSH_SYNC;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001483 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484
Trond Myklebustb8413f92011-03-21 15:37:01 -04001485 res = nfs_commit_set_lock(NFS_I(inode), may_wait);
1486 if (res <= 0)
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001487 goto out_mark_dirty;
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001488 res = nfs_scan_commit(inode, &head, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 if (res) {
Fred Isamana861a1e2011-03-23 13:27:51 +00001490 int error;
1491
1492 error = pnfs_commit_list(inode, &head, how);
1493 if (error == PNFS_NOT_ATTEMPTED)
1494 error = nfs_commit_list(inode, &head, how);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001495 if (error < 0)
1496 return error;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001497 if (!may_wait)
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001498 goto out_mark_dirty;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001499 error = wait_on_bit(&NFS_I(inode)->flags,
1500 NFS_INO_COMMIT,
1501 nfs_wait_bit_killable,
1502 TASK_KILLABLE);
1503 if (error < 0)
1504 return error;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001505 } else
1506 nfs_commit_clear_lock(NFS_I(inode));
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001507 return res;
1508 /* Note: If we exit without ensuring that the commit is complete,
1509 * we must mark the inode as dirty. Otherwise, future calls to
1510 * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
1511 * that the data is on the disk.
1512 */
1513out_mark_dirty:
1514 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515 return res;
1516}
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001517
1518static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1519{
Trond Myklebust420e3642010-02-19 17:00:02 -08001520 struct nfs_inode *nfsi = NFS_I(inode);
1521 int flags = FLUSH_SYNC;
1522 int ret = 0;
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001523
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001524 if (wbc->sync_mode == WB_SYNC_NONE) {
1525 /* Don't commit yet if this is a non-blocking flush and there
1526 * are a lot of outstanding writes for this mapping.
1527 */
1528 if (nfsi->ncommit <= (nfsi->npages >> 1))
1529 goto out_mark_dirty;
Trond Myklebust420e3642010-02-19 17:00:02 -08001530
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001531 /* don't wait for the COMMIT response */
Trond Myklebust420e3642010-02-19 17:00:02 -08001532 flags = 0;
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001533 }
1534
Trond Myklebust420e3642010-02-19 17:00:02 -08001535 ret = nfs_commit_inode(inode, flags);
1536 if (ret >= 0) {
1537 if (wbc->sync_mode == WB_SYNC_NONE) {
1538 if (ret < wbc->nr_to_write)
1539 wbc->nr_to_write -= ret;
1540 else
1541 wbc->nr_to_write = 0;
1542 }
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001543 return 0;
Trond Myklebust420e3642010-02-19 17:00:02 -08001544 }
1545out_mark_dirty:
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001546 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1547 return ret;
1548}
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001549#else
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001550static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1551{
1552 return 0;
1553}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554#endif
1555
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001556int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1557{
Andy Adamson863a3c62011-03-23 13:27:54 +00001558 int ret;
1559
1560 ret = nfs_commit_unstable_pages(inode, wbc);
1561 if (ret >= 0 && test_bit(NFS_INO_LAYOUTCOMMIT, &NFS_I(inode)->flags)) {
Andy Adamsonef311532011-03-12 02:58:10 -05001562 int status;
1563 bool sync = true;
Andy Adamson863a3c62011-03-23 13:27:54 +00001564
Andy Adamsonef311532011-03-12 02:58:10 -05001565 if (wbc->sync_mode == WB_SYNC_NONE || wbc->nonblocking ||
1566 wbc->for_background)
1567 sync = false;
Andy Adamson863a3c62011-03-23 13:27:54 +00001568
1569 status = pnfs_layoutcommit_inode(inode, sync);
1570 if (status < 0)
1571 return status;
1572 }
1573 return ret;
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001574}
1575
Trond Myklebustacdc53b2010-02-19 17:03:26 -08001576/*
1577 * flush the inode to disk.
1578 */
1579int nfs_wb_all(struct inode *inode)
Trond Myklebust34901f72007-07-25 14:09:54 -04001580{
1581 struct writeback_control wbc = {
Trond Myklebust72cb77f2009-03-11 14:10:30 -04001582 .sync_mode = WB_SYNC_ALL,
Trond Myklebust34901f72007-07-25 14:09:54 -04001583 .nr_to_write = LONG_MAX,
Trond Myklebustd7fb1202008-10-06 20:08:56 -04001584 .range_start = 0,
1585 .range_end = LLONG_MAX,
Trond Myklebust34901f72007-07-25 14:09:54 -04001586 };
Trond Myklebust34901f72007-07-25 14:09:54 -04001587
Trond Myklebustacdc53b2010-02-19 17:03:26 -08001588 return sync_inode(inode, &wbc);
Trond Myklebust1c759502006-10-09 16:18:38 -04001589}
1590
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001591int nfs_wb_page_cancel(struct inode *inode, struct page *page)
1592{
1593 struct nfs_page *req;
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001594 int ret = 0;
1595
1596 BUG_ON(!PageLocked(page));
1597 for (;;) {
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001598 wait_on_page_writeback(page);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001599 req = nfs_page_find_request(page);
1600 if (req == NULL)
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001601 break;
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001602 if (nfs_lock_request_dontget(req)) {
1603 nfs_inode_remove_request(req);
1604 /*
1605 * In case nfs_inode_remove_request has marked the
1606 * page as being dirty
1607 */
1608 cancel_dirty_page(page, PAGE_CACHE_SIZE);
1609 nfs_unlock_request(req);
1610 break;
1611 }
1612 ret = nfs_wait_on_request(req);
Trond Myklebustc9edda72010-01-26 15:41:34 -05001613 nfs_release_request(req);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001614 if (ret < 0)
Trond Myklebustc9889502010-02-19 17:03:21 -08001615 break;
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001616 }
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001617 return ret;
1618}
1619
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001620/*
1621 * Write back all requests on one page - we do this before reading it.
1622 */
1623int nfs_wb_page(struct inode *inode, struct page *page)
Trond Myklebust1c759502006-10-09 16:18:38 -04001624{
1625 loff_t range_start = page_offset(page);
1626 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001627 struct writeback_control wbc = {
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001628 .sync_mode = WB_SYNC_ALL,
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001629 .nr_to_write = 0,
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001630 .range_start = range_start,
1631 .range_end = range_end,
1632 };
1633 int ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001634
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001635 for (;;) {
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001636 wait_on_page_writeback(page);
Trond Myklebust73e33022008-04-11 16:03:54 -04001637 if (clear_page_dirty_for_io(page)) {
1638 ret = nfs_writepage_locked(page, &wbc);
1639 if (ret < 0)
1640 goto out_error;
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001641 continue;
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001642 }
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001643 if (!PagePrivate(page))
1644 break;
1645 ret = nfs_commit_inode(inode, FLUSH_SYNC);
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001646 if (ret < 0)
Trond Myklebust73e33022008-04-11 16:03:54 -04001647 goto out_error;
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001648 }
Trond Myklebust73e33022008-04-11 16:03:54 -04001649 return 0;
1650out_error:
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001651 return ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001652}
1653
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001654#ifdef CONFIG_MIGRATION
1655int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
1656 struct page *page)
1657{
1658 struct nfs_page *req;
1659 int ret;
1660
Trond Myklebust7549ad52010-02-08 09:32:34 -05001661 nfs_fscache_release_page(page, GFP_KERNEL);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001662
Trond Myklebustcfb506e2010-07-30 15:31:57 -04001663 req = nfs_find_and_lock_request(page, false);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001664 ret = PTR_ERR(req);
1665 if (IS_ERR(req))
1666 goto out;
1667
1668 ret = migrate_page(mapping, newpage, page);
1669 if (!req)
1670 goto out;
1671 if (ret)
1672 goto out_unlock;
1673 page_cache_get(newpage);
Trond Myklebust190f38e2009-12-10 09:05:55 -05001674 spin_lock(&mapping->host->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001675 req->wb_page = newpage;
1676 SetPagePrivate(newpage);
Trond Myklebust190f38e2009-12-10 09:05:55 -05001677 set_page_private(newpage, (unsigned long)req);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001678 ClearPagePrivate(page);
1679 set_page_private(page, 0);
Trond Myklebust190f38e2009-12-10 09:05:55 -05001680 spin_unlock(&mapping->host->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001681 page_cache_release(page);
1682out_unlock:
1683 nfs_clear_page_tag_locked(req);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001684out:
1685 return ret;
1686}
1687#endif
1688
David Howellsf7b422b2006-06-09 09:34:33 -04001689int __init nfs_init_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690{
1691 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
1692 sizeof(struct nfs_write_data),
1693 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001694 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001695 if (nfs_wdata_cachep == NULL)
1696 return -ENOMEM;
1697
Matthew Dobson93d23412006-03-26 01:37:50 -08001698 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1699 nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 if (nfs_wdata_mempool == NULL)
1701 return -ENOMEM;
1702
Matthew Dobson93d23412006-03-26 01:37:50 -08001703 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
1704 nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 if (nfs_commit_mempool == NULL)
1706 return -ENOMEM;
1707
Peter Zijlstra89a09142007-03-16 13:38:26 -08001708 /*
1709 * NFS congestion size, scale with available memory.
1710 *
1711 * 64MB: 8192k
1712 * 128MB: 11585k
1713 * 256MB: 16384k
1714 * 512MB: 23170k
1715 * 1GB: 32768k
1716 * 2GB: 46340k
1717 * 4GB: 65536k
1718 * 8GB: 92681k
1719 * 16GB: 131072k
1720 *
1721 * This allows larger machines to have larger/more transfers.
1722 * Limit the default to 256M
1723 */
1724 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
1725 if (nfs_congestion_kb > 256*1024)
1726 nfs_congestion_kb = 256*1024;
1727
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 return 0;
1729}
1730
David Brownell266bee82006-06-27 12:59:15 -07001731void nfs_destroy_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732{
1733 mempool_destroy(nfs_commit_mempool);
1734 mempool_destroy(nfs_wdata_mempool);
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001735 kmem_cache_destroy(nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001736}
1737