blob: a2c7c28049d5096e484bf18453b2be64f17d884f [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>
Paul Gortmakerafeacc82011-05-26 16:00:52 -040023#include <linux/export.h>
Andrew Morton3fcfab12006-10-19 23:28:16 -070024
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27#include "delegation.h"
Trond Myklebust49a70f22006-12-05 00:35:38 -050028#include "internal.h"
Chuck Lever91d5b472006-03-20 13:44:14 -050029#include "iostat.h"
Andy Adamsondef6ed72009-04-01 09:22:26 -040030#include "nfs4_fs.h"
Trond Myklebust074cc1d2009-08-10 08:54:13 -040031#include "fscache.h"
Fred Isaman94ad1c82011-03-01 01:34:14 +000032#include "pnfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#define NFSDBG_FACILITY NFSDBG_PAGECACHE
35
36#define MIN_POOL_WRITE (32)
37#define MIN_POOL_COMMIT (4)
38
39/*
40 * Local function declarations
41 */
Fred Isamanf8512ad2008-03-19 11:24:39 -040042static void nfs_redirty_request(struct nfs_page *req);
Fred Isaman6c75dc02012-04-20 14:47:47 -040043static const struct rpc_call_ops nfs_write_common_ops;
Trond Myklebust788e7a82006-03-20 13:44:27 -050044static const struct rpc_call_ops nfs_commit_ops;
Fred Isaman061ae2e2012-04-20 14:47:48 -040045static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;
Fred Isamanf453a542012-04-20 14:47:54 -040046static const struct nfs_commit_completion_ops nfs_commit_completion_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;
Fred Isaman0b7c0152012-04-20 14:47:39 -040050static struct kmem_cache *nfs_cdata_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051static mempool_t *nfs_commit_mempool;
52
Fred Isaman0b7c0152012-04-20 14:47:39 -040053struct nfs_commit_data *nfs_commitdata_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
Mel Gorman192e5012012-07-31 16:45:16 -070055 struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO);
Chuck Lever40859d72005-11-30 18:09:02 -050056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 if (p) {
58 memset(p, 0, sizeof(*p));
59 INIT_LIST_HEAD(&p->pages);
60 }
61 return p;
62}
Fred Isamane0c2b382011-03-23 13:27:53 +000063EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Fred Isaman0b7c0152012-04-20 14:47:39 -040065void nfs_commit_free(struct nfs_commit_data *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070066{
67 mempool_free(p, nfs_commit_mempool);
68}
Fred Isamane0c2b382011-03-23 13:27:53 +000069EXPORT_SYMBOL_GPL(nfs_commit_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Fred Isaman6c75dc02012-04-20 14:47:47 -040071struct nfs_write_header *nfs_writehdr_alloc(void)
Trond Myklebust3feb2d42006-03-20 13:44:37 -050072{
Mel Gorman192e5012012-07-31 16:45:16 -070073 struct nfs_write_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
Trond Myklebust3feb2d42006-03-20 13:44:37 -050074
75 if (p) {
Fred Isamancd841602012-04-20 14:47:44 -040076 struct nfs_pgio_header *hdr = &p->header;
Fred Isamancd841602012-04-20 14:47:44 -040077
Trond Myklebust3feb2d42006-03-20 13:44:37 -050078 memset(p, 0, sizeof(*p));
Fred Isamancd841602012-04-20 14:47:44 -040079 INIT_LIST_HEAD(&hdr->pages);
Fred Isaman6c75dc02012-04-20 14:47:47 -040080 INIT_LIST_HEAD(&hdr->rpc_list);
81 spin_lock_init(&hdr->lock);
82 atomic_set(&hdr->refcnt, 0);
Trond Myklebust9bce0082012-06-05 18:32:03 -040083 hdr->verf = &p->verf;
Trond Myklebust3feb2d42006-03-20 13:44:37 -050084 }
85 return p;
86}
Bryan Schumaker89d77c82012-07-30 16:05:25 -040087EXPORT_SYMBOL_GPL(nfs_writehdr_alloc);
Trond Myklebust3feb2d42006-03-20 13:44:37 -050088
Fred Isaman1763da12012-04-20 14:47:57 -040089static struct nfs_write_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr,
90 unsigned int pagecount)
Fred Isaman6c75dc02012-04-20 14:47:47 -040091{
92 struct nfs_write_data *data, *prealloc;
93
94 prealloc = &container_of(hdr, struct nfs_write_header, header)->rpc_data;
95 if (prealloc->header == NULL)
96 data = prealloc;
97 else
98 data = kzalloc(sizeof(*data), GFP_KERNEL);
99 if (!data)
100 goto out;
101
102 if (nfs_pgarray_set(&data->pages, pagecount)) {
103 data->header = hdr;
104 atomic_inc(&hdr->refcnt);
105 } else {
106 if (data != prealloc)
107 kfree(data);
108 data = NULL;
109 }
110out:
111 return data;
112}
113
Fred Isamancd841602012-04-20 14:47:44 -0400114void nfs_writehdr_free(struct nfs_pgio_header *hdr)
Trond Myklebust3feb2d42006-03-20 13:44:37 -0500115{
Fred Isamancd841602012-04-20 14:47:44 -0400116 struct nfs_write_header *whdr = container_of(hdr, struct nfs_write_header, header);
117 mempool_free(whdr, nfs_wdata_mempool);
Trond Myklebust3feb2d42006-03-20 13:44:37 -0500118}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400119EXPORT_SYMBOL_GPL(nfs_writehdr_free);
Trond Myklebust3feb2d42006-03-20 13:44:37 -0500120
Trond Myklebustdce81292011-07-13 15:59:19 -0400121void nfs_writedata_release(struct nfs_write_data *wdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Fred Isaman6c75dc02012-04-20 14:47:47 -0400123 struct nfs_pgio_header *hdr = wdata->header;
124 struct nfs_write_header *write_header = container_of(hdr, struct nfs_write_header, header);
125
Trond Myklebust383ba712008-02-19 20:04:20 -0500126 put_nfs_open_context(wdata->args.context);
Fred Isaman30dd3742012-04-20 14:47:45 -0400127 if (wdata->pages.pagevec != wdata->pages.page_array)
128 kfree(wdata->pages.pagevec);
Trond Myklebust6db6dd72013-01-04 12:47:04 -0500129 if (wdata == &write_header->rpc_data) {
Fred Isaman6c75dc02012-04-20 14:47:47 -0400130 wdata->header = NULL;
Trond Myklebust6db6dd72013-01-04 12:47:04 -0500131 wdata = NULL;
132 }
Fred Isaman6c75dc02012-04-20 14:47:47 -0400133 if (atomic_dec_and_test(&hdr->refcnt))
Fred Isaman061ae2e2012-04-20 14:47:48 -0400134 hdr->completion_ops->completion(hdr);
Trond Myklebust6db6dd72013-01-04 12:47:04 -0500135 /* Note: we only free the rpc_task after callbacks are done.
136 * See the comment in rpc_free_task() for why
137 */
138 kfree(wdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400140EXPORT_SYMBOL_GPL(nfs_writedata_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400142static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
143{
144 ctx->error = error;
145 smp_wmb();
146 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
147}
148
Mel Gorman29418aa2012-07-31 16:45:10 -0700149static struct nfs_page *
150nfs_page_find_request_locked(struct nfs_inode *nfsi, struct page *page)
Trond Myklebust277459d2006-12-05 00:35:35 -0500151{
152 struct nfs_page *req = NULL;
153
Mel Gorman29418aa2012-07-31 16:45:10 -0700154 if (PagePrivate(page))
Trond Myklebust277459d2006-12-05 00:35:35 -0500155 req = (struct nfs_page *)page_private(page);
Mel Gorman29418aa2012-07-31 16:45:10 -0700156 else if (unlikely(PageSwapCache(page))) {
157 struct nfs_page *freq, *t;
158
159 /* Linearly search the commit list for the correct req */
160 list_for_each_entry_safe(freq, t, &nfsi->commit_info.list, wb_list) {
161 if (freq->wb_page == page) {
162 req = freq;
163 break;
164 }
165 }
Trond Myklebust277459d2006-12-05 00:35:35 -0500166 }
Mel Gorman29418aa2012-07-31 16:45:10 -0700167
168 if (req)
169 kref_get(&req->wb_kref);
170
Trond Myklebust277459d2006-12-05 00:35:35 -0500171 return req;
172}
173
174static struct nfs_page *nfs_page_find_request(struct page *page)
175{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700176 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebust277459d2006-12-05 00:35:35 -0500177 struct nfs_page *req = NULL;
Trond Myklebust277459d2006-12-05 00:35:35 -0500178
Trond Myklebust587142f2007-07-02 09:57:54 -0400179 spin_lock(&inode->i_lock);
Mel Gorman29418aa2012-07-31 16:45:10 -0700180 req = nfs_page_find_request_locked(NFS_I(inode), page);
Trond Myklebust587142f2007-07-02 09:57:54 -0400181 spin_unlock(&inode->i_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500182 return req;
183}
184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185/* Adjust the file length if we're writing beyond the end */
186static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
187{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700188 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebusta3d01452008-06-11 12:21:19 -0400189 loff_t end, i_size;
190 pgoff_t end_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Trond Myklebusta3d01452008-06-11 12:21:19 -0400192 spin_lock(&inode->i_lock);
193 i_size = i_size_read(inode);
194 end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
Mel Gormand56b4dd2012-07-31 16:45:06 -0700195 if (i_size > 0 && page_file_index(page) < end_index)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400196 goto out;
Mel Gormand56b4dd2012-07-31 16:45:06 -0700197 end = page_file_offset(page) + ((loff_t)offset+count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 if (i_size >= end)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400199 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 i_size_write(inode, end);
Trond Myklebusta3d01452008-06-11 12:21:19 -0400201 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
202out:
203 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204}
205
Trond Myklebusta301b772007-02-06 11:07:15 -0800206/* A writeback failed: mark the page as bad, and invalidate the page cache */
207static void nfs_set_pageerror(struct page *page)
208{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700209 nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
Trond Myklebusta301b772007-02-06 11:07:15 -0800210}
211
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212/* We can set the PG_uptodate flag if we see that a write request
213 * covers the full page.
214 */
215static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
216{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 if (PageUptodate(page))
218 return;
219 if (base != 0)
220 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500221 if (count != nfs_page_length(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500223 SetPageUptodate(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226static int wb_priority(struct writeback_control *wbc)
227{
228 if (wbc->for_reclaim)
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400229 return FLUSH_HIGHPRI | FLUSH_STABLE;
Wu Fengguangb17621f2009-12-03 13:54:25 +0100230 if (wbc->for_kupdate || wbc->for_background)
Trond Myklebustb31268a2011-03-21 17:02:00 -0400231 return FLUSH_LOWPRI | FLUSH_COND_STABLE;
232 return FLUSH_COND_STABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233}
234
235/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800236 * NFS congestion control
237 */
238
239int nfs_congestion_kb;
240
241#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
242#define NFS_CONGESTION_OFF_THRESH \
243 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
244
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400245static void nfs_set_page_writeback(struct page *page)
Peter Zijlstra89a09142007-03-16 13:38:26 -0800246{
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400247 struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host);
Trond Myklebust5a6d41b2007-04-14 19:10:12 -0400248 int ret = test_set_page_writeback(page);
249
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400250 WARN_ON_ONCE(ret != 0);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800251
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400252 if (atomic_long_inc_return(&nfss->writeback) >
253 NFS_CONGESTION_ON_THRESH) {
254 set_bdi_congested(&nfss->backing_dev_info,
255 BLK_RW_ASYNC);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800256 }
257}
258
259static void nfs_end_page_writeback(struct page *page)
260{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700261 struct inode *inode = page_file_mapping(page)->host;
Peter Zijlstra89a09142007-03-16 13:38:26 -0800262 struct nfs_server *nfss = NFS_SERVER(inode);
263
264 end_page_writeback(page);
Peter Zijlstrac4dc4be2007-10-16 23:25:41 -0700265 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
Jens Axboe8aa7e842009-07-09 14:52:32 +0200266 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800267}
268
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400269static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
Trond Myklebuste261f512006-12-05 00:35:41 -0500270{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700271 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebuste261f512006-12-05 00:35:41 -0500272 struct nfs_page *req;
Trond Myklebuste261f512006-12-05 00:35:41 -0500273 int ret;
274
Trond Myklebust587142f2007-07-02 09:57:54 -0400275 spin_lock(&inode->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400276 for (;;) {
Mel Gorman29418aa2012-07-31 16:45:10 -0700277 req = nfs_page_find_request_locked(NFS_I(inode), page);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400278 if (req == NULL)
279 break;
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400280 if (nfs_lock_request(req))
Trond Myklebuste261f512006-12-05 00:35:41 -0500281 break;
282 /* Note: If we hold the page lock, as is the case in nfs_writepage,
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400283 * then the call to nfs_lock_request() will always
Trond Myklebuste261f512006-12-05 00:35:41 -0500284 * succeed provided that someone hasn't already marked the
285 * request as dirty (in which case we don't care).
286 */
Trond Myklebust587142f2007-07-02 09:57:54 -0400287 spin_unlock(&inode->i_lock);
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400288 if (!nonblock)
289 ret = nfs_wait_on_request(req);
290 else
291 ret = -EAGAIN;
Trond Myklebuste261f512006-12-05 00:35:41 -0500292 nfs_release_request(req);
293 if (ret != 0)
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400294 return ERR_PTR(ret);
Trond Myklebust587142f2007-07-02 09:57:54 -0400295 spin_lock(&inode->i_lock);
Trond Myklebuste261f512006-12-05 00:35:41 -0500296 }
Trond Myklebust587142f2007-07-02 09:57:54 -0400297 spin_unlock(&inode->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400298 return req;
299}
300
301/*
302 * Find an associated nfs write request, and prepare to flush it out
303 * May return an error if the user signalled nfs_wait_on_request().
304 */
305static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400306 struct page *page, bool nonblock)
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400307{
308 struct nfs_page *req;
309 int ret = 0;
310
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400311 req = nfs_find_and_lock_request(page, nonblock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400312 if (!req)
313 goto out;
314 ret = PTR_ERR(req);
315 if (IS_ERR(req))
316 goto out;
317
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400318 nfs_set_page_writeback(page);
319 WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400320
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400321 ret = 0;
Fred Isamanf8512ad2008-03-19 11:24:39 -0400322 if (!nfs_pageio_add_request(pgio, req)) {
323 nfs_redirty_request(req);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400324 ret = pgio->pg_error;
Fred Isamanf8512ad2008-03-19 11:24:39 -0400325 }
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400326out:
327 return ret;
Trond Myklebuste261f512006-12-05 00:35:41 -0500328}
329
Trond Myklebustf758c8852007-07-22 19:27:32 -0400330static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
331{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700332 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400333 int ret;
Trond Myklebustf758c8852007-07-22 19:27:32 -0400334
335 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
336 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
337
Mel Gormand56b4dd2012-07-31 16:45:06 -0700338 nfs_pageio_cond_complete(pgio, page_file_index(page));
Wu Fengguang1b430be2010-10-26 14:21:26 -0700339 ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400340 if (ret == -EAGAIN) {
341 redirty_page_for_writepage(wbc, page);
342 ret = 0;
343 }
344 return ret;
Trond Myklebustf758c8852007-07-22 19:27:32 -0400345}
346
Trond Myklebuste261f512006-12-05 00:35:41 -0500347/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 * Write an mmapped page to the server.
349 */
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500350static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400352 struct nfs_pageio_descriptor pgio;
Trond Myklebuste261f512006-12-05 00:35:41 -0500353 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Mel Gormand56b4dd2012-07-31 16:45:06 -0700355 NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio,
Bryan Schumaker57208fa2012-06-20 15:53:48 -0400356 page->mapping->host,
357 wb_priority(wbc),
358 &nfs_async_write_completion_ops);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400359 err = nfs_do_writepage(page, wbc, &pgio);
360 nfs_pageio_complete(&pgio);
361 if (err < 0)
362 return err;
363 if (pgio.pg_error < 0)
364 return pgio.pg_error;
365 return 0;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500366}
367
368int nfs_writepage(struct page *page, struct writeback_control *wbc)
369{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400370 int ret;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500371
Trond Myklebustf758c8852007-07-22 19:27:32 -0400372 ret = nfs_writepage_locked(page, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 unlock_page(page);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400374 return ret;
375}
376
377static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
378{
379 int ret;
380
381 ret = nfs_do_writepage(page, wbc, data);
382 unlock_page(page);
383 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384}
385
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
387{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 struct inode *inode = mapping->host;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400389 unsigned long *bitlock = &NFS_I(inode)->flags;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400390 struct nfs_pageio_descriptor pgio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 int err;
392
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400393 /* Stop dirtying of new pages while we sync */
394 err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
395 nfs_wait_bit_killable, TASK_KILLABLE);
396 if (err)
397 goto out_err;
398
Chuck Lever91d5b472006-03-20 13:44:14 -0500399 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
400
Bryan Schumaker57208fa2012-06-20 15:53:48 -0400401 NFS_PROTO(inode)->write_pageio_init(&pgio, inode, wb_priority(wbc), &nfs_async_write_completion_ops);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400402 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400403 nfs_pageio_complete(&pgio);
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400404
405 clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
406 smp_mb__after_clear_bit();
407 wake_up_bit(bitlock, NFS_INO_FLUSHING);
408
Trond Myklebustf758c8852007-07-22 19:27:32 -0400409 if (err < 0)
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400410 goto out_err;
411 err = pgio.pg_error;
412 if (err < 0)
413 goto out_err;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400414 return 0;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400415out_err:
416 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417}
418
419/*
420 * Insert a write request into an inode
421 */
Fred Isamand6d6dc72012-03-08 17:29:35 -0500422static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423{
424 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400425
426 /* Lock the request! */
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400427 nfs_lock_request(req);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400428
429 spin_lock(&inode->i_lock);
Bryan Schumaker011e2a72012-06-20 15:53:43 -0400430 if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
Trond Myklebusta9a4a872011-10-17 16:08:46 -0700431 inode->i_version++;
Mel Gorman29418aa2012-07-31 16:45:10 -0700432 /*
433 * Swap-space should not get truncated. Hence no need to plug the race
434 * with invalidate/truncate.
435 */
436 if (likely(!PageSwapCache(req->wb_page))) {
437 set_bit(PG_MAPPED, &req->wb_flags);
438 SetPagePrivate(req->wb_page);
439 set_page_private(req->wb_page, (unsigned long)req);
440 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 nfsi->npages++;
Trond Myklebustc03b4022007-06-17 13:26:38 -0400442 kref_get(&req->wb_kref);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400443 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444}
445
446/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800447 * Remove a write request from an inode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 */
449static void nfs_inode_remove_request(struct nfs_page *req)
450{
Al Viro3d4ff432011-06-22 18:40:12 -0400451 struct inode *inode = req->wb_context->dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 struct nfs_inode *nfsi = NFS_I(inode);
453
Trond Myklebust587142f2007-07-02 09:57:54 -0400454 spin_lock(&inode->i_lock);
Mel Gorman29418aa2012-07-31 16:45:10 -0700455 if (likely(!PageSwapCache(req->wb_page))) {
456 set_page_private(req->wb_page, 0);
457 ClearPagePrivate(req->wb_page);
458 clear_bit(PG_MAPPED, &req->wb_flags);
459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 nfsi->npages--;
Trond Myklebust4d65c522011-03-25 14:15:11 -0400461 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 nfs_release_request(req);
463}
464
Trond Myklebust61822ab2006-12-05 00:35:42 -0500465static void
Fred6d884e82008-03-19 11:24:38 -0400466nfs_mark_request_dirty(struct nfs_page *req)
Trond Myklebust61822ab2006-12-05 00:35:42 -0500467{
Trond Myklebust61822ab2006-12-05 00:35:42 -0500468 __set_page_dirty_nobuffers(req->wb_page);
469}
470
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400471#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400472/**
473 * nfs_request_add_commit_list - add request to a commit list
474 * @req: pointer to a struct nfs_page
Fred Isamanea2cf222012-04-20 14:47:53 -0400475 * @dst: commit list head
476 * @cinfo: holds list lock and accounting info
Trond Myklebust8dd37752012-03-15 17:16:40 -0400477 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400478 * This sets the PG_CLEAN bit, updates the cinfo count of
Trond Myklebust8dd37752012-03-15 17:16:40 -0400479 * number of outstanding requests requiring a commit as well as
480 * the MM page stats.
481 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400482 * The caller must _not_ hold the cinfo->lock, but must be
Trond Myklebust8dd37752012-03-15 17:16:40 -0400483 * holding the nfs_page lock.
484 */
485void
Fred Isamanea2cf222012-04-20 14:47:53 -0400486nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
487 struct nfs_commit_info *cinfo)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400488{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400489 set_bit(PG_CLEAN, &(req)->wb_flags);
Fred Isamanea2cf222012-04-20 14:47:53 -0400490 spin_lock(cinfo->lock);
491 nfs_list_add_request(req, dst);
492 cinfo->mds->ncommit++;
493 spin_unlock(cinfo->lock);
Fred Isaman56f9cd62012-04-20 14:47:56 -0400494 if (!cinfo->dreq) {
495 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Mel Gormand56b4dd2012-07-31 16:45:06 -0700496 inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
Fred Isaman56f9cd62012-04-20 14:47:56 -0400497 BDI_RECLAIMABLE);
498 __mark_inode_dirty(req->wb_context->dentry->d_inode,
499 I_DIRTY_DATASYNC);
500 }
Trond Myklebust8dd37752012-03-15 17:16:40 -0400501}
502EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
503
504/**
505 * nfs_request_remove_commit_list - Remove request from a commit list
506 * @req: pointer to a nfs_page
Fred Isamanea2cf222012-04-20 14:47:53 -0400507 * @cinfo: holds list lock and accounting info
Trond Myklebust8dd37752012-03-15 17:16:40 -0400508 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400509 * This clears the PG_CLEAN bit, and updates the cinfo's count of
Trond Myklebust8dd37752012-03-15 17:16:40 -0400510 * number of outstanding requests requiring a commit
511 * It does not update the MM page stats.
512 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400513 * The caller _must_ hold the cinfo->lock and the nfs_page lock.
Trond Myklebust8dd37752012-03-15 17:16:40 -0400514 */
515void
Fred Isamanea2cf222012-04-20 14:47:53 -0400516nfs_request_remove_commit_list(struct nfs_page *req,
517 struct nfs_commit_info *cinfo)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400518{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400519 if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
520 return;
521 nfs_list_remove_request(req);
Fred Isamanea2cf222012-04-20 14:47:53 -0400522 cinfo->mds->ncommit--;
Trond Myklebust8dd37752012-03-15 17:16:40 -0400523}
524EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);
525
Fred Isamanea2cf222012-04-20 14:47:53 -0400526static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
527 struct inode *inode)
528{
529 cinfo->lock = &inode->i_lock;
530 cinfo->mds = &NFS_I(inode)->commit_info;
531 cinfo->ds = pnfs_get_ds_info(inode);
Fred Isamanb359f9d2012-04-20 14:47:55 -0400532 cinfo->dreq = NULL;
Fred Isamanf453a542012-04-20 14:47:54 -0400533 cinfo->completion_ops = &nfs_commit_completion_ops;
Fred Isamanea2cf222012-04-20 14:47:53 -0400534}
535
536void nfs_init_cinfo(struct nfs_commit_info *cinfo,
537 struct inode *inode,
538 struct nfs_direct_req *dreq)
539{
Fred Isaman1763da12012-04-20 14:47:57 -0400540 if (dreq)
541 nfs_init_cinfo_from_dreq(cinfo, dreq);
542 else
543 nfs_init_cinfo_from_inode(cinfo, inode);
Fred Isamanea2cf222012-04-20 14:47:53 -0400544}
545EXPORT_SYMBOL_GPL(nfs_init_cinfo);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547/*
548 * Add a request to the inode's commit list.
549 */
Fred Isaman1763da12012-04-20 14:47:57 -0400550void
Fred Isamanea2cf222012-04-20 14:47:53 -0400551nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
552 struct nfs_commit_info *cinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553{
Fred Isamanea2cf222012-04-20 14:47:53 -0400554 if (pnfs_mark_request_commit(req, lseg, cinfo))
Trond Myklebust8dd37752012-03-15 17:16:40 -0400555 return;
Fred Isamanea2cf222012-04-20 14:47:53 -0400556 nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557}
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400558
Fred Isamand6d6dc72012-03-08 17:29:35 -0500559static void
560nfs_clear_page_commit(struct page *page)
561{
562 dec_zone_page_state(page, NR_UNSTABLE_NFS);
Mel Gormand56b4dd2012-07-31 16:45:06 -0700563 dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE);
Fred Isamand6d6dc72012-03-08 17:29:35 -0500564}
565
Trond Myklebust8dd37752012-03-15 17:16:40 -0400566static void
Trond Myklebuste468bae2008-06-13 13:25:22 -0400567nfs_clear_request_commit(struct nfs_page *req)
568{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400569 if (test_bit(PG_CLEAN, &req->wb_flags)) {
570 struct inode *inode = req->wb_context->dentry->d_inode;
Fred Isamanea2cf222012-04-20 14:47:53 -0400571 struct nfs_commit_info cinfo;
Trond Myklebuste468bae2008-06-13 13:25:22 -0400572
Fred Isamanea2cf222012-04-20 14:47:53 -0400573 nfs_init_cinfo_from_inode(&cinfo, inode);
574 if (!pnfs_clear_request_commit(req, &cinfo)) {
575 spin_lock(cinfo.lock);
576 nfs_request_remove_commit_list(req, &cinfo);
577 spin_unlock(cinfo.lock);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400578 }
Fred Isamand6d6dc72012-03-08 17:29:35 -0500579 nfs_clear_page_commit(req->wb_page);
Trond Myklebuste468bae2008-06-13 13:25:22 -0400580 }
Trond Myklebuste468bae2008-06-13 13:25:22 -0400581}
582
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400583static inline
584int nfs_write_need_commit(struct nfs_write_data *data)
585{
Fred Isaman465d5242011-03-23 13:27:44 +0000586 if (data->verf.committed == NFS_DATA_SYNC)
Fred Isamancd841602012-04-20 14:47:44 -0400587 return data->header->lseg == NULL;
588 return data->verf.committed != NFS_FILE_SYNC;
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400589}
590
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400591#else
Bryan Schumaker68cd6fa2012-04-30 14:30:22 -0400592static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
593 struct inode *inode)
594{
595}
596
597void nfs_init_cinfo(struct nfs_commit_info *cinfo,
598 struct inode *inode,
599 struct nfs_direct_req *dreq)
600{
601}
602
Fred Isaman1763da12012-04-20 14:47:57 -0400603void
Fred Isamanea2cf222012-04-20 14:47:53 -0400604nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
605 struct nfs_commit_info *cinfo)
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400606{
607}
608
Trond Myklebust8dd37752012-03-15 17:16:40 -0400609static void
Trond Myklebuste468bae2008-06-13 13:25:22 -0400610nfs_clear_request_commit(struct nfs_page *req)
611{
Trond Myklebuste468bae2008-06-13 13:25:22 -0400612}
613
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400614static inline
615int nfs_write_need_commit(struct nfs_write_data *data)
616{
617 return 0;
618}
619
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620#endif
621
Fred Isaman061ae2e2012-04-20 14:47:48 -0400622static void nfs_write_completion(struct nfs_pgio_header *hdr)
Fred Isaman6c75dc02012-04-20 14:47:47 -0400623{
Fred Isamanea2cf222012-04-20 14:47:53 -0400624 struct nfs_commit_info cinfo;
Fred Isaman6c75dc02012-04-20 14:47:47 -0400625 unsigned long bytes = 0;
626
627 if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
628 goto out;
Fred Isamanea2cf222012-04-20 14:47:53 -0400629 nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400630 while (!list_empty(&hdr->pages)) {
631 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400632
633 bytes += req->wb_bytes;
634 nfs_list_remove_request(req);
635 if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
636 (hdr->good_bytes < bytes)) {
Trond Myklebustd1182b32012-05-09 13:37:43 -0400637 nfs_set_pageerror(req->wb_page);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400638 nfs_context_set_write_error(req->wb_context, hdr->error);
639 goto remove_req;
640 }
641 if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) {
642 nfs_mark_request_dirty(req);
643 goto next;
644 }
645 if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) {
Trond Myklebust2f2c63b2012-06-08 11:56:09 -0400646 memcpy(&req->wb_verf, &hdr->verf->verifier, sizeof(req->wb_verf));
Fred Isamanea2cf222012-04-20 14:47:53 -0400647 nfs_mark_request_commit(req, hdr->lseg, &cinfo);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400648 goto next;
649 }
650remove_req:
651 nfs_inode_remove_request(req);
652next:
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400653 nfs_unlock_request(req);
Trond Myklebustd1182b32012-05-09 13:37:43 -0400654 nfs_end_page_writeback(req->wb_page);
Trond Myklebust3aff4eb2012-05-09 14:30:35 -0400655 nfs_release_request(req);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400656 }
657out:
658 hdr->release(hdr);
659}
660
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400661#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
Fred Isamanea2cf222012-04-20 14:47:53 -0400662static unsigned long
663nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400664{
Fred Isamanea2cf222012-04-20 14:47:53 -0400665 return cinfo->mds->ncommit;
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400666}
667
Fred Isamanea2cf222012-04-20 14:47:53 -0400668/* cinfo->lock held by caller */
Fred Isaman1763da12012-04-20 14:47:57 -0400669int
Fred Isamanea2cf222012-04-20 14:47:53 -0400670nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
671 struct nfs_commit_info *cinfo, int max)
Fred Isamand6d6dc72012-03-08 17:29:35 -0500672{
673 struct nfs_page *req, *tmp;
674 int ret = 0;
675
676 list_for_each_entry_safe(req, tmp, src, wb_list) {
Trond Myklebust8dd37752012-03-15 17:16:40 -0400677 if (!nfs_lock_request(req))
678 continue;
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400679 kref_get(&req->wb_kref);
Fred Isamanea2cf222012-04-20 14:47:53 -0400680 if (cond_resched_lock(cinfo->lock))
Trond Myklebust3b3be882012-03-17 11:59:30 -0400681 list_safe_reset_next(req, tmp, wb_list);
Fred Isamanea2cf222012-04-20 14:47:53 -0400682 nfs_request_remove_commit_list(req, cinfo);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400683 nfs_list_add_request(req, dst);
684 ret++;
Fred Isaman1763da12012-04-20 14:47:57 -0400685 if ((ret == max) && !cinfo->dreq)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400686 break;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500687 }
688 return ret;
689}
Fred Isamand6d6dc72012-03-08 17:29:35 -0500690
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691/*
692 * nfs_scan_commit - Scan an inode for commit requests
693 * @inode: NFS inode to scan
Fred Isamanea2cf222012-04-20 14:47:53 -0400694 * @dst: mds destination list
695 * @cinfo: mds and ds lists of reqs ready to commit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 *
697 * Moves requests from the inode's 'commit' request list.
698 * The requests are *not* checked to ensure that they form a contiguous set.
699 */
Fred Isaman1763da12012-04-20 14:47:57 -0400700int
Fred Isamanea2cf222012-04-20 14:47:53 -0400701nfs_scan_commit(struct inode *inode, struct list_head *dst,
702 struct nfs_commit_info *cinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703{
Fred Isamand6d6dc72012-03-08 17:29:35 -0500704 int ret = 0;
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400705
Fred Isamanea2cf222012-04-20 14:47:53 -0400706 spin_lock(cinfo->lock);
707 if (cinfo->mds->ncommit > 0) {
Trond Myklebust8dd37752012-03-15 17:16:40 -0400708 const int max = INT_MAX;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500709
Fred Isamanea2cf222012-04-20 14:47:53 -0400710 ret = nfs_scan_commit_list(&cinfo->mds->list, dst,
711 cinfo, max);
712 ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
Fred Isamand6d6dc72012-03-08 17:29:35 -0500713 }
Fred Isamanea2cf222012-04-20 14:47:53 -0400714 spin_unlock(cinfo->lock);
Trond Myklebustff778d02010-02-19 16:53:39 -0800715 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716}
Fred Isamand6d6dc72012-03-08 17:29:35 -0500717
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500718#else
Fred Isamanea2cf222012-04-20 14:47:53 -0400719static unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400720{
721 return 0;
722}
723
Fred Isaman1763da12012-04-20 14:47:57 -0400724int nfs_scan_commit(struct inode *inode, struct list_head *dst,
725 struct nfs_commit_info *cinfo)
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500726{
727 return 0;
728}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729#endif
730
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731/*
Trond Myklebuste7d39062008-06-13 12:12:32 -0400732 * Search for an existing write request, and attempt to update
733 * it to reflect a new dirty region on a given page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 *
Trond Myklebuste7d39062008-06-13 12:12:32 -0400735 * If the attempt fails, then the existing request is flushed out
736 * to disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 */
Trond Myklebuste7d39062008-06-13 12:12:32 -0400738static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
739 struct page *page,
740 unsigned int offset,
741 unsigned int bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742{
Trond Myklebuste7d39062008-06-13 12:12:32 -0400743 struct nfs_page *req;
744 unsigned int rqend;
745 unsigned int end;
746 int error;
747
748 if (!PagePrivate(page))
749 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750
751 end = offset + bytes;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400752 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 for (;;) {
Mel Gorman29418aa2012-07-31 16:45:10 -0700755 req = nfs_page_find_request_locked(NFS_I(inode), page);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400756 if (req == NULL)
757 goto out_unlock;
Trond Myklebust277459d2006-12-05 00:35:35 -0500758
Trond Myklebuste7d39062008-06-13 12:12:32 -0400759 rqend = req->wb_offset + req->wb_bytes;
760 /*
761 * Tell the caller to flush out the request if
762 * the offsets are non-contiguous.
763 * Note: nfs_flush_incompatible() will already
764 * have flushed out requests having wrong owners.
765 */
Trond Myklebuste468bae2008-06-13 13:25:22 -0400766 if (offset > rqend
Trond Myklebuste7d39062008-06-13 12:12:32 -0400767 || end < req->wb_offset)
768 goto out_flushme;
769
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400770 if (nfs_lock_request(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Trond Myklebuste7d39062008-06-13 12:12:32 -0400773 /* The request is locked, so wait and then retry */
Trond Myklebust587142f2007-07-02 09:57:54 -0400774 spin_unlock(&inode->i_lock);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400775 error = nfs_wait_on_request(req);
776 nfs_release_request(req);
777 if (error != 0)
778 goto out_err;
779 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 }
781
782 /* Okay, the request matches. Update the region */
783 if (offset < req->wb_offset) {
784 req->wb_offset = offset;
785 req->wb_pgbase = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 if (end > rqend)
788 req->wb_bytes = end - req->wb_offset;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400789 else
790 req->wb_bytes = rqend - req->wb_offset;
791out_unlock:
792 spin_unlock(&inode->i_lock);
Fred Isamanca138f32012-04-05 15:26:36 -0400793 if (req)
794 nfs_clear_request_commit(req);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400795 return req;
796out_flushme:
797 spin_unlock(&inode->i_lock);
798 nfs_release_request(req);
799 error = nfs_wb_page(inode, page);
800out_err:
801 return ERR_PTR(error);
802}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
Trond Myklebuste7d39062008-06-13 12:12:32 -0400804/*
805 * Try to update an existing write request, or create one if there is none.
806 *
807 * Note: Should always be called with the Page Lock held to prevent races
808 * if we have to add a new request. Also assumes that the caller has
809 * already called nfs_flush_incompatible() if necessary.
810 */
811static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
812 struct page *page, unsigned int offset, unsigned int bytes)
813{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700814 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400815 struct nfs_page *req;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400816
817 req = nfs_try_to_update_request(inode, page, offset, bytes);
818 if (req != NULL)
819 goto out;
820 req = nfs_create_request(ctx, inode, page, offset, bytes);
821 if (IS_ERR(req))
822 goto out;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500823 nfs_inode_add_request(inode, req);
Trond Myklebustefc91ed2008-06-10 18:31:00 -0400824out:
Trond Myklebust61e930a2007-10-18 17:08:05 -0400825 return req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826}
827
Trond Myklebuste7d39062008-06-13 12:12:32 -0400828static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
829 unsigned int offset, unsigned int count)
830{
831 struct nfs_page *req;
832
833 req = nfs_setup_write_request(ctx, page, offset, count);
834 if (IS_ERR(req))
835 return PTR_ERR(req);
836 /* Update file length */
837 nfs_grow_file(page, offset, count);
838 nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
Trond Myklebusta6305dd2010-04-09 19:07:08 -0400839 nfs_mark_request_dirty(req);
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400840 nfs_unlock_and_release_request(req);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400841 return 0;
842}
843
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844int nfs_flush_incompatible(struct file *file, struct page *page)
845{
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400846 struct nfs_open_context *ctx = nfs_file_open_context(file);
Trond Myklebust2a369152012-08-13 18:54:45 -0400847 struct nfs_lock_context *l_ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 struct nfs_page *req;
Trond Myklebust1a545332006-12-05 00:35:40 -0500849 int do_flush, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 /*
851 * Look for a request corresponding to this page. If there
852 * is one, and it belongs to another file, we flush it out
853 * before we try to copy anything into the page. Do this
854 * due to the lack of an ACCESS-type call in NFSv2.
855 * Also do the same if we find a request from an existing
856 * dropped page.
857 */
Trond Myklebust1a545332006-12-05 00:35:40 -0500858 do {
859 req = nfs_page_find_request(page);
860 if (req == NULL)
861 return 0;
Trond Myklebust2a369152012-08-13 18:54:45 -0400862 l_ctx = req->wb_lock_context;
863 do_flush = req->wb_page != page || req->wb_context != ctx;
864 if (l_ctx) {
865 do_flush |= l_ctx->lockowner.l_owner != current->files
866 || l_ctx->lockowner.l_pid != current->tgid;
867 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 nfs_release_request(req);
Trond Myklebust1a545332006-12-05 00:35:40 -0500869 if (!do_flush)
870 return 0;
Mel Gormand56b4dd2012-07-31 16:45:06 -0700871 status = nfs_wb_page(page_file_mapping(page)->host, page);
Trond Myklebust1a545332006-12-05 00:35:40 -0500872 } while (status == 0);
873 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874}
875
876/*
Trond Myklebust5d47a352008-02-07 17:24:07 -0500877 * If the page cache is marked as unsafe or invalid, then we can't rely on
878 * the PageUptodate() flag. In this case, we will need to turn off
879 * write optimisations that depend on the page contents being correct.
880 */
Trond Myklebust8d197a52012-04-29 12:50:01 -0400881static bool nfs_write_pageuptodate(struct page *page, struct inode *inode)
Trond Myklebust5d47a352008-02-07 17:24:07 -0500882{
Trond Myklebust8d197a52012-04-29 12:50:01 -0400883 if (nfs_have_delegated_attributes(inode))
884 goto out;
Jeff Layton81d9bce2012-12-10 09:25:48 -0500885 if (NFS_I(inode)->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE))
Trond Myklebust8d197a52012-04-29 12:50:01 -0400886 return false;
887out:
888 return PageUptodate(page) != 0;
Trond Myklebust5d47a352008-02-07 17:24:07 -0500889}
890
891/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 * Update and possibly write a cached page of an NFS file.
893 *
894 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
895 * things with a page scheduled for an RPC call (e.g. invalidate it).
896 */
897int nfs_updatepage(struct file *file, struct page *page,
898 unsigned int offset, unsigned int count)
899{
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400900 struct nfs_open_context *ctx = nfs_file_open_context(file);
Mel Gormand56b4dd2012-07-31 16:45:06 -0700901 struct inode *inode = page_file_mapping(page)->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 int status = 0;
903
Chuck Lever91d5b472006-03-20 13:44:14 -0500904 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
905
Chuck Lever48186c72008-06-11 17:56:05 -0400906 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800907 file->f_path.dentry->d_parent->d_name.name,
908 file->f_path.dentry->d_name.name, count,
Mel Gormand56b4dd2012-07-31 16:45:06 -0700909 (long long)(page_file_offset(page) + offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 /* If we're not using byte range locks, and we know the page
Trond Myklebust5d47a352008-02-07 17:24:07 -0500912 * is up to date, it may be more efficient to extend the write
913 * to cover the entire page in order to avoid fragmentation
914 * inefficiencies.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 */
Trond Myklebust5d47a352008-02-07 17:24:07 -0500916 if (nfs_write_pageuptodate(page, inode) &&
917 inode->i_flock == NULL &&
Christoph Hellwig6b2f3d12009-10-27 11:05:28 +0100918 !(file->f_flags & O_DSYNC)) {
Trond Myklebust49a70f22006-12-05 00:35:38 -0500919 count = max(count + offset, nfs_page_length(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 }
922
Trond Myklebuste21195a2006-12-05 00:35:39 -0500923 status = nfs_writepage_setup(ctx, page, offset, count);
Trond Myklebust03fa9e82008-06-05 16:02:35 -0400924 if (status < 0)
925 nfs_set_pageerror(page);
Trond Myklebust59b7c052011-10-17 18:22:55 -0700926 else
927 __set_page_dirty_nobuffers(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928
Chuck Lever48186c72008-06-11 17:56:05 -0400929 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 status, (long long)i_size_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 return status;
932}
933
Trond Myklebust3ff75762007-07-14 15:40:00 -0400934static int flush_task_priority(int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935{
936 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
937 case FLUSH_HIGHPRI:
938 return RPC_PRIORITY_HIGH;
939 case FLUSH_LOWPRI:
940 return RPC_PRIORITY_LOW;
941 }
942 return RPC_PRIORITY_NORMAL;
943}
944
Fred Isamanc5996c42012-04-20 14:47:41 -0400945int nfs_initiate_write(struct rpc_clnt *clnt,
946 struct nfs_write_data *data,
Andy Adamsond138d5d2011-03-03 15:13:41 +0000947 const struct rpc_call_ops *call_ops,
Andy Adamson9f0ec1762012-04-27 17:53:44 -0400948 int how, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949{
Fred Isamancd841602012-04-20 14:47:44 -0400950 struct inode *inode = data->header->inode;
Trond Myklebust3ff75762007-07-14 15:40:00 -0400951 int priority = flush_task_priority(how);
Trond Myklebust07737692007-10-25 18:42:54 -0400952 struct rpc_task *task;
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400953 struct rpc_message msg = {
954 .rpc_argp = &data->args,
955 .rpc_resp = &data->res,
Fred Isamancd841602012-04-20 14:47:44 -0400956 .rpc_cred = data->header->cred,
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400957 };
Trond Myklebust84115e12007-07-14 15:39:59 -0400958 struct rpc_task_setup task_setup_data = {
Andy Adamsond138d5d2011-03-03 15:13:41 +0000959 .rpc_client = clnt,
Trond Myklebust07737692007-10-25 18:42:54 -0400960 .task = &data->task,
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400961 .rpc_message = &msg,
Trond Myklebust84115e12007-07-14 15:39:59 -0400962 .callback_ops = call_ops,
963 .callback_data = data,
Trond Myklebust101070c2008-02-19 20:04:23 -0500964 .workqueue = nfsiod_workqueue,
Andy Adamson9f0ec1762012-04-27 17:53:44 -0400965 .flags = RPC_TASK_ASYNC | flags,
Trond Myklebust3ff75762007-07-14 15:40:00 -0400966 .priority = priority,
Trond Myklebust84115e12007-07-14 15:39:59 -0400967 };
Trond Myklebust2c61be02010-04-09 19:54:50 -0400968 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969
Andy Adamsond138d5d2011-03-03 15:13:41 +0000970 /* Set up the initial task struct. */
971 NFS_PROTO(inode)->write_setup(data, &msg);
972
973 dprintk("NFS: %5u initiated write call "
974 "(req %s/%lld, %u bytes @ offset %llu)\n",
975 data->task.tk_pid,
976 inode->i_sb->s_id,
977 (long long)NFS_FILEID(inode),
978 data->args.count,
979 (unsigned long long)data->args.offset);
980
981 task = rpc_run_task(&task_setup_data);
982 if (IS_ERR(task)) {
983 ret = PTR_ERR(task);
984 goto out;
985 }
986 if (how & FLUSH_SYNC) {
987 ret = rpc_wait_for_completion_task(task);
988 if (ret == 0)
989 ret = task->tk_status;
990 }
991 rpc_put_task(task);
992out:
993 return ret;
994}
Fred Isamana69aef12011-03-03 15:13:47 +0000995EXPORT_SYMBOL_GPL(nfs_initiate_write);
Andy Adamsond138d5d2011-03-03 15:13:41 +0000996
997/*
998 * Set up the argument/result storage required for the RPC call.
999 */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001000static void nfs_write_rpcsetup(struct nfs_write_data *data,
Andy Adamsond138d5d2011-03-03 15:13:41 +00001001 unsigned int count, unsigned int offset,
Fred Isamanea2cf222012-04-20 14:47:53 -04001002 int how, struct nfs_commit_info *cinfo)
Andy Adamsond138d5d2011-03-03 15:13:41 +00001003{
Fred Isaman6c75dc02012-04-20 14:47:47 -04001004 struct nfs_page *req = data->header->req;
Andy Adamsond138d5d2011-03-03 15:13:41 +00001005
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 /* Set up the RPC argument and reply structs
1007 * NB: take care not to mess about with data->commit et al. */
1008
Fred Isaman6c75dc02012-04-20 14:47:47 -04001009 data->args.fh = NFS_FH(data->header->inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010 data->args.offset = req_offset(req) + offset;
Boaz Harrosh2bea0382011-06-16 11:35:46 -04001011 /* pnfs_set_layoutcommit needs this */
1012 data->mds_offset = data->args.offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 data->args.pgbase = req->wb_pgbase + offset;
Fred Isaman30dd3742012-04-20 14:47:45 -04001014 data->args.pages = data->pages.pagevec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 data->args.count = count;
Trond Myklebust383ba712008-02-19 20:04:20 -05001016 data->args.context = get_nfs_open_context(req->wb_context);
Trond Myklebustf11ac8d2010-06-25 16:35:53 -04001017 data->args.lock_context = req->wb_lock_context;
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001018 data->args.stable = NFS_UNSTABLE;
Trond Myklebust87ed5eb2011-07-12 13:42:01 -04001019 switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
1020 case 0:
1021 break;
1022 case FLUSH_COND_STABLE:
Fred Isamanea2cf222012-04-20 14:47:53 -04001023 if (nfs_reqs_to_commit(cinfo))
Trond Myklebust87ed5eb2011-07-12 13:42:01 -04001024 break;
1025 default:
1026 data->args.stable = NFS_FILE_SYNC;
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001027 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028
1029 data->res.fattr = &data->fattr;
1030 data->res.count = count;
1031 data->res.verf = &data->verf;
Trond Myklebust0e574af2005-10-27 22:12:38 -04001032 nfs_fattr_init(&data->fattr);
Trond Myklebust6e4efd52011-07-12 13:42:02 -04001033}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
Trond Myklebust6e4efd52011-07-12 13:42:02 -04001035static int nfs_do_write(struct nfs_write_data *data,
1036 const struct rpc_call_ops *call_ops,
Trond Myklebust6e4efd52011-07-12 13:42:02 -04001037 int how)
1038{
Fred Isamancd841602012-04-20 14:47:44 -04001039 struct inode *inode = data->header->inode;
Andy Adamson0382b742011-03-03 15:13:45 +00001040
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001041 return nfs_initiate_write(NFS_CLIENT(inode), data, call_ops, how, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042}
1043
Trond Myklebust275acaa2011-07-12 13:42:02 -04001044static int nfs_do_multiple_writes(struct list_head *head,
1045 const struct rpc_call_ops *call_ops,
Trond Myklebust275acaa2011-07-12 13:42:02 -04001046 int how)
1047{
1048 struct nfs_write_data *data;
1049 int ret = 0;
1050
1051 while (!list_empty(head)) {
1052 int ret2;
1053
Fred Isaman6c75dc02012-04-20 14:47:47 -04001054 data = list_first_entry(head, struct nfs_write_data, list);
Trond Myklebust275acaa2011-07-12 13:42:02 -04001055 list_del_init(&data->list);
1056
Trond Myklebustdce81292011-07-13 15:59:19 -04001057 ret2 = nfs_do_write(data, call_ops, how);
Trond Myklebust275acaa2011-07-12 13:42:02 -04001058 if (ret == 0)
1059 ret = ret2;
1060 }
1061 return ret;
1062}
1063
Fred6d884e82008-03-19 11:24:38 -04001064/* If a nfs_flush_* function fails, it should remove reqs from @head and
1065 * call this on each, which will prepare them to be retried on next
1066 * writeback using standard nfs.
1067 */
1068static void nfs_redirty_request(struct nfs_page *req)
1069{
1070 nfs_mark_request_dirty(req);
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001071 nfs_unlock_request(req);
Trond Myklebustd1182b32012-05-09 13:37:43 -04001072 nfs_end_page_writeback(req->wb_page);
Trond Myklebust3aff4eb2012-05-09 14:30:35 -04001073 nfs_release_request(req);
Fred6d884e82008-03-19 11:24:38 -04001074}
1075
Fred Isaman061ae2e2012-04-20 14:47:48 -04001076static void nfs_async_write_error(struct list_head *head)
Fred Isaman6c75dc02012-04-20 14:47:47 -04001077{
1078 struct nfs_page *req;
1079
1080 while (!list_empty(head)) {
1081 req = nfs_list_entry(head->next);
1082 nfs_list_remove_request(req);
1083 nfs_redirty_request(req);
1084 }
1085}
1086
Fred Isaman061ae2e2012-04-20 14:47:48 -04001087static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
1088 .error_cleanup = nfs_async_write_error,
1089 .completion = nfs_write_completion,
1090};
1091
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001092static void nfs_flush_error(struct nfs_pageio_descriptor *desc,
1093 struct nfs_pgio_header *hdr)
1094{
1095 set_bit(NFS_IOHDR_REDO, &hdr->flags);
1096 while (!list_empty(&hdr->rpc_list)) {
1097 struct nfs_write_data *data = list_first_entry(&hdr->rpc_list,
1098 struct nfs_write_data, list);
1099 list_del(&data->list);
1100 nfs_writedata_release(data);
1101 }
1102 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1103}
1104
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105/*
1106 * Generate multiple small requests to write out a single
1107 * contiguous dirty area on one page.
1108 */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001109static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
1110 struct nfs_pgio_header *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111{
Fred Isaman6c75dc02012-04-20 14:47:47 -04001112 struct nfs_page *req = hdr->req;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 struct page *page = req->wb_page;
1114 struct nfs_write_data *data;
Trond Myklebustd0979712011-07-12 13:42:02 -04001115 size_t wsize = desc->pg_bsize, nbytes;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -07001116 unsigned int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 int requests = 0;
Fred Isamanea2cf222012-04-20 14:47:53 -04001118 struct nfs_commit_info cinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119
Fred Isamanea2cf222012-04-20 14:47:53 -04001120 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121
Trond Myklebustb31268a2011-03-21 17:02:00 -04001122 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
Fred Isamanea2cf222012-04-20 14:47:53 -04001123 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo) ||
Trond Myklebustb31268a2011-03-21 17:02:00 -04001124 desc->pg_count > wsize))
1125 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1126
1127
Trond Myklebust275acaa2011-07-12 13:42:02 -04001128 offset = 0;
Fred Isamanc76069b2011-03-03 15:13:48 +00001129 nbytes = desc->pg_count;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -07001130 do {
1131 size_t len = min(nbytes, wsize);
1132
Fred Isaman6c75dc02012-04-20 14:47:47 -04001133 data = nfs_writedata_alloc(hdr, 1);
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001134 if (!data) {
1135 nfs_flush_error(desc, hdr);
1136 return -ENOMEM;
1137 }
Fred Isaman30dd3742012-04-20 14:47:45 -04001138 data->pages.pagevec[0] = page;
Fred Isamanea2cf222012-04-20 14:47:53 -04001139 nfs_write_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001140 list_add(&data->list, &hdr->rpc_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 requests++;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -07001142 nbytes -= len;
Trond Myklebust275acaa2011-07-12 13:42:02 -04001143 offset += len;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -07001144 } while (nbytes != 0);
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001145 nfs_list_remove_request(req);
1146 nfs_list_add_request(req, &hdr->pages);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001147 desc->pg_rpc_callops = &nfs_write_common_ops;
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001148 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149}
1150
1151/*
1152 * Create an RPC task for the given write request and kick it.
1153 * The page must have been locked by the caller.
1154 *
1155 * It may happen that the page we're passed is not marked dirty.
1156 * This is the case if nfs_updatepage detects a conflicting request
1157 * that has been written but not committed.
1158 */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001159static int nfs_flush_one(struct nfs_pageio_descriptor *desc,
1160 struct nfs_pgio_header *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161{
1162 struct nfs_page *req;
1163 struct page **pages;
1164 struct nfs_write_data *data;
Fred Isamanc76069b2011-03-03 15:13:48 +00001165 struct list_head *head = &desc->pg_list;
Fred Isamanea2cf222012-04-20 14:47:53 -04001166 struct nfs_commit_info cinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167
Fred Isaman6c75dc02012-04-20 14:47:47 -04001168 data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base,
1169 desc->pg_count));
1170 if (!data) {
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001171 nfs_flush_error(desc, hdr);
1172 return -ENOMEM;
Fred Isaman44b83792011-03-03 15:13:44 +00001173 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001174
Fred Isamanea2cf222012-04-20 14:47:53 -04001175 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
Fred Isaman30dd3742012-04-20 14:47:45 -04001176 pages = data->pages.pagevec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 while (!list_empty(head)) {
1178 req = nfs_list_entry(head->next);
1179 nfs_list_remove_request(req);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001180 nfs_list_add_request(req, &hdr->pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 *pages++ = req->wb_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183
Trond Myklebustb31268a2011-03-21 17:02:00 -04001184 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
Fred Isamanea2cf222012-04-20 14:47:53 -04001185 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
Trond Myklebustb31268a2011-03-21 17:02:00 -04001186 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1187
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 /* Set up the argument struct */
Fred Isamanea2cf222012-04-20 14:47:53 -04001189 nfs_write_rpcsetup(data, desc->pg_count, 0, desc->pg_ioflags, &cinfo);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001190 list_add(&data->list, &hdr->rpc_list);
1191 desc->pg_rpc_callops = &nfs_write_common_ops;
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001192 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193}
1194
Fred Isaman6c75dc02012-04-20 14:47:47 -04001195int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
1196 struct nfs_pgio_header *hdr)
Trond Myklebustdce81292011-07-13 15:59:19 -04001197{
1198 if (desc->pg_bsize < PAGE_CACHE_SIZE)
Fred Isaman6c75dc02012-04-20 14:47:47 -04001199 return nfs_flush_multi(desc, hdr);
1200 return nfs_flush_one(desc, hdr);
Trond Myklebustdce81292011-07-13 15:59:19 -04001201}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001202EXPORT_SYMBOL_GPL(nfs_generic_flush);
Trond Myklebustdce81292011-07-13 15:59:19 -04001203
1204static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
Trond Myklebust1751c362011-06-10 13:30:23 -04001205{
Fred Isaman6c75dc02012-04-20 14:47:47 -04001206 struct nfs_write_header *whdr;
1207 struct nfs_pgio_header *hdr;
Trond Myklebust275acaa2011-07-12 13:42:02 -04001208 int ret;
1209
Fred Isaman6c75dc02012-04-20 14:47:47 -04001210 whdr = nfs_writehdr_alloc();
1211 if (!whdr) {
Trond Myklebust9b5415b2012-04-27 14:31:47 -04001212 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001213 return -ENOMEM;
1214 }
1215 hdr = &whdr->header;
1216 nfs_pgheader_init(desc, hdr, nfs_writehdr_free);
1217 atomic_inc(&hdr->refcnt);
1218 ret = nfs_generic_flush(desc, hdr);
Trond Myklebust50828d72011-07-12 13:42:02 -04001219 if (ret == 0)
Fred Isaman6c75dc02012-04-20 14:47:47 -04001220 ret = nfs_do_multiple_writes(&hdr->rpc_list,
1221 desc->pg_rpc_callops,
1222 desc->pg_ioflags);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001223 if (atomic_dec_and_test(&hdr->refcnt))
Fred Isaman061ae2e2012-04-20 14:47:48 -04001224 hdr->completion_ops->completion(hdr);
Trond Myklebust275acaa2011-07-12 13:42:02 -04001225 return ret;
Trond Myklebust1751c362011-06-10 13:30:23 -04001226}
Trond Myklebust1751c362011-06-10 13:30:23 -04001227
1228static const struct nfs_pageio_ops nfs_pageio_write_ops = {
1229 .pg_test = nfs_generic_pg_test,
1230 .pg_doio = nfs_generic_pg_writepages,
1231};
1232
Bryan Schumaker57208fa2012-06-20 15:53:48 -04001233void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
Fred Isaman061ae2e2012-04-20 14:47:48 -04001234 struct inode *inode, int ioflags,
1235 const struct nfs_pgio_completion_ops *compl_ops)
Trond Myklebust1751c362011-06-10 13:30:23 -04001236{
Fred Isaman061ae2e2012-04-20 14:47:48 -04001237 nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops,
Trond Myklebust1751c362011-06-10 13:30:23 -04001238 NFS_SERVER(inode)->wsize, ioflags);
1239}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001240EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
Trond Myklebust1751c362011-06-10 13:30:23 -04001241
Trond Myklebustdce81292011-07-13 15:59:19 -04001242void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
1243{
1244 pgio->pg_ops = &nfs_pageio_write_ops;
1245 pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
1246}
Trond Myklebust1f945352011-07-13 15:59:57 -04001247EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
Trond Myklebustdce81292011-07-13 15:59:19 -04001248
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249
Andy Adamsondef6ed72009-04-01 09:22:26 -04001250void nfs_write_prepare(struct rpc_task *task, void *calldata)
1251{
1252 struct nfs_write_data *data = calldata;
Fred Isamancd841602012-04-20 14:47:44 -04001253 NFS_PROTO(data->header->inode)->write_rpc_prepare(task, data);
Trond Myklebustc58c8442013-03-18 19:45:14 -04001254 if (unlikely(test_bit(NFS_CONTEXT_BAD, &data->args.context->flags)))
1255 rpc_exit(task, -EIO);
Andy Adamsondef6ed72009-04-01 09:22:26 -04001256}
Andy Adamsondef6ed72009-04-01 09:22:26 -04001257
Fred Isaman0b7c0152012-04-20 14:47:39 -04001258void nfs_commit_prepare(struct rpc_task *task, void *calldata)
1259{
1260 struct nfs_commit_data *data = calldata;
1261
1262 NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
1263}
1264
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265/*
1266 * Handle a write reply that flushes a whole page.
1267 *
1268 * FIXME: There is an inherent race with invalidate_inode_pages and
1269 * writebacks since the page->count is kept > 1 for as long
1270 * as the page has a write request pending.
1271 */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001272static void nfs_writeback_done_common(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273{
Trond Myklebust788e7a82006-03-20 13:44:27 -05001274 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001276 nfs_writeback_done(task, data);
1277}
1278
Fred Isaman6c75dc02012-04-20 14:47:47 -04001279static void nfs_writeback_release_common(void *calldata)
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001280{
1281 struct nfs_write_data *data = calldata;
Fred Isamancd841602012-04-20 14:47:44 -04001282 struct nfs_pgio_header *hdr = data->header;
Trond Myklebuste2fecb22012-01-06 08:57:46 -05001283 int status = data->task.tk_status;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001284
Fred Isaman6c75dc02012-04-20 14:47:47 -04001285 if ((status >= 0) && nfs_write_need_commit(data)) {
1286 spin_lock(&hdr->lock);
1287 if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags))
1288 ; /* Do nothing */
1289 else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags))
Trond Myklebust9bce0082012-06-05 18:32:03 -04001290 memcpy(hdr->verf, &data->verf, sizeof(*hdr->verf));
1291 else if (memcmp(hdr->verf, &data->verf, sizeof(*hdr->verf)))
Fred Isaman6c75dc02012-04-20 14:47:47 -04001292 set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags);
1293 spin_unlock(&hdr->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001294 }
Fred Isamancd841602012-04-20 14:47:44 -04001295 nfs_writedata_release(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296}
1297
Fred Isaman6c75dc02012-04-20 14:47:47 -04001298static const struct rpc_call_ops nfs_write_common_ops = {
Andy Adamsondef6ed72009-04-01 09:22:26 -04001299 .rpc_call_prepare = nfs_write_prepare,
Fred Isaman6c75dc02012-04-20 14:47:47 -04001300 .rpc_call_done = nfs_writeback_done_common,
1301 .rpc_release = nfs_writeback_release_common,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001302};
1303
1304
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305/*
1306 * This function is called when the WRITE call is complete.
1307 */
Fred Isaman13602892011-02-11 15:42:38 +00001308void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 struct nfs_writeargs *argp = &data->args;
1311 struct nfs_writeres *resp = &data->res;
Fred Isamancd841602012-04-20 14:47:44 -04001312 struct inode *inode = data->header->inode;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001313 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314
Chuck Levera3f565b2007-01-31 12:14:01 -05001315 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 task->tk_pid, task->tk_status);
1317
Chuck Leverf551e442006-09-20 14:33:04 -04001318 /*
1319 * ->write_done will attempt to use post-op attributes to detect
1320 * conflicting writes by other clients. A strict interpretation
1321 * of close-to-open would allow us to continue caching even if
1322 * another writer had changed the file, but some applications
1323 * depend on tighter cache coherency when writing.
1324 */
Fred Isamancd841602012-04-20 14:47:44 -04001325 status = NFS_PROTO(inode)->write_done(task, data);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001326 if (status != 0)
Fred Isaman13602892011-02-11 15:42:38 +00001327 return;
Fred Isamancd841602012-04-20 14:47:44 -04001328 nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
Chuck Lever91d5b472006-03-20 13:44:14 -05001329
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001330#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
1332 /* We tried a write call, but the server did not
1333 * commit data to stable storage even though we
1334 * requested it.
1335 * Note: There is a known bug in Tru64 < 5.0 in which
1336 * the server reports NFS_DATA_SYNC, but performs
1337 * NFS_FILE_SYNC. We therefore implement this checking
1338 * as a dprintk() in order to avoid filling syslog.
1339 */
1340 static unsigned long complain;
1341
Fred Isamana69aef12011-03-03 15:13:47 +00001342 /* Note this will print the MDS for a DS write */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343 if (time_before(complain, jiffies)) {
Chuck Lever48186c72008-06-11 17:56:05 -04001344 dprintk("NFS: faulty NFS server %s:"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 " (committed = %d) != (stable = %d)\n",
Fred Isamancd841602012-04-20 14:47:44 -04001346 NFS_SERVER(inode)->nfs_client->cl_hostname,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 resp->verf->committed, argp->stable);
1348 complain = jiffies + 300 * HZ;
1349 }
1350 }
1351#endif
Fred Isaman6c75dc02012-04-20 14:47:47 -04001352 if (task->tk_status < 0)
1353 nfs_set_pgio_error(data->header, task->tk_status, argp->offset);
1354 else if (resp->count < argp->count) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 static unsigned long complain;
1356
Fred Isaman6c75dc02012-04-20 14:47:47 -04001357 /* This a short write! */
Fred Isamancd841602012-04-20 14:47:44 -04001358 nfs_inc_stats(inode, NFSIOS_SHORTWRITE);
Chuck Lever91d5b472006-03-20 13:44:14 -05001359
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 /* Has the server at least made some progress? */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001361 if (resp->count == 0) {
1362 if (time_before(complain, jiffies)) {
1363 printk(KERN_WARNING
1364 "NFS: Server wrote zero bytes, expected %u.\n",
1365 argp->count);
1366 complain = jiffies + 300 * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001368 nfs_set_pgio_error(data->header, -EIO, argp->offset);
1369 task->tk_status = -EIO;
Fred Isaman13602892011-02-11 15:42:38 +00001370 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001372 /* Was this an NFSv2 write or an NFSv3 stable write? */
1373 if (resp->verf->committed != NFS_UNSTABLE) {
1374 /* Resend from where the server left off */
1375 data->mds_offset += resp->count;
1376 argp->offset += resp->count;
1377 argp->pgbase += resp->count;
1378 argp->count -= resp->count;
1379 } else {
1380 /* Resend as a stable write in order to avoid
1381 * headaches in the case of a server crash.
1382 */
1383 argp->stable = NFS_FILE_SYNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001385 rpc_restart_call_prepare(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387}
1388
1389
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001390#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust71d0a612010-04-22 15:35:57 -04001391static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
1392{
Trond Myklebustb8413f92011-03-21 15:37:01 -04001393 int ret;
1394
Trond Myklebust71d0a612010-04-22 15:35:57 -04001395 if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags))
1396 return 1;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001397 if (!may_wait)
1398 return 0;
1399 ret = out_of_line_wait_on_bit_lock(&nfsi->flags,
1400 NFS_INO_COMMIT,
1401 nfs_wait_bit_killable,
1402 TASK_KILLABLE);
1403 return (ret < 0) ? ret : 1;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001404}
1405
Fred Isamanf453a542012-04-20 14:47:54 -04001406static void nfs_commit_clear_lock(struct nfs_inode *nfsi)
Trond Myklebust71d0a612010-04-22 15:35:57 -04001407{
1408 clear_bit(NFS_INO_COMMIT, &nfsi->flags);
1409 smp_mb__after_clear_bit();
1410 wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
1411}
1412
Fred Isaman0b7c0152012-04-20 14:47:39 -04001413void nfs_commitdata_release(struct nfs_commit_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001415 put_nfs_open_context(data->context);
1416 nfs_commit_free(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417}
Fred Isamane0c2b382011-03-23 13:27:53 +00001418EXPORT_SYMBOL_GPL(nfs_commitdata_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419
Fred Isaman0b7c0152012-04-20 14:47:39 -04001420int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001421 const struct rpc_call_ops *call_ops,
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001422 int how, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423{
Trond Myklebust07737692007-10-25 18:42:54 -04001424 struct rpc_task *task;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001425 int priority = flush_task_priority(how);
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001426 struct rpc_message msg = {
1427 .rpc_argp = &data->args,
1428 .rpc_resp = &data->res,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001429 .rpc_cred = data->cred,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001430 };
Trond Myklebust84115e12007-07-14 15:39:59 -04001431 struct rpc_task_setup task_setup_data = {
Trond Myklebust07737692007-10-25 18:42:54 -04001432 .task = &data->task,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001433 .rpc_client = clnt,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001434 .rpc_message = &msg,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001435 .callback_ops = call_ops,
Trond Myklebust84115e12007-07-14 15:39:59 -04001436 .callback_data = data,
Trond Myklebust101070c2008-02-19 20:04:23 -05001437 .workqueue = nfsiod_workqueue,
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001438 .flags = RPC_TASK_ASYNC | flags,
Trond Myklebust3ff75762007-07-14 15:40:00 -04001439 .priority = priority,
Trond Myklebust84115e12007-07-14 15:39:59 -04001440 };
Trond Myklebust788e7a82006-03-20 13:44:27 -05001441 /* Set up the initial task struct. */
Fred Isaman9ace33c2011-03-23 13:27:45 +00001442 NFS_PROTO(data->inode)->commit_setup(data, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
Chuck Levera3f565b2007-01-31 12:14:01 -05001444 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001445
Trond Myklebust07737692007-10-25 18:42:54 -04001446 task = rpc_run_task(&task_setup_data);
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001447 if (IS_ERR(task))
1448 return PTR_ERR(task);
Jeff Laytond2224e72011-03-06 17:14:13 +00001449 if (how & FLUSH_SYNC)
1450 rpc_wait_for_completion_task(task);
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001451 rpc_put_task(task);
1452 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453}
Fred Isamane0c2b382011-03-23 13:27:53 +00001454EXPORT_SYMBOL_GPL(nfs_initiate_commit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
1456/*
Fred Isaman9ace33c2011-03-23 13:27:45 +00001457 * Set up the argument/result storage required for the RPC call.
1458 */
Fred Isaman0b7c0152012-04-20 14:47:39 -04001459void nfs_init_commit(struct nfs_commit_data *data,
Fred Isamanf453a542012-04-20 14:47:54 -04001460 struct list_head *head,
1461 struct pnfs_layout_segment *lseg,
1462 struct nfs_commit_info *cinfo)
Fred Isaman9ace33c2011-03-23 13:27:45 +00001463{
1464 struct nfs_page *first = nfs_list_entry(head->next);
Al Viro3d4ff432011-06-22 18:40:12 -04001465 struct inode *inode = first->wb_context->dentry->d_inode;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001466
1467 /* Set up the RPC argument and reply structs
1468 * NB: take care not to mess about with data->commit et al. */
1469
1470 list_splice_init(head, &data->pages);
1471
1472 data->inode = inode;
1473 data->cred = first->wb_context->cred;
Fred Isaman988b6dc2011-03-23 13:27:52 +00001474 data->lseg = lseg; /* reference transferred */
Fred Isaman9ace33c2011-03-23 13:27:45 +00001475 data->mds_ops = &nfs_commit_ops;
Fred Isamanf453a542012-04-20 14:47:54 -04001476 data->completion_ops = cinfo->completion_ops;
Fred Isamanb359f9d2012-04-20 14:47:55 -04001477 data->dreq = cinfo->dreq;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001478
1479 data->args.fh = NFS_FH(data->inode);
1480 /* Note: we always request a commit of the entire inode */
1481 data->args.offset = 0;
1482 data->args.count = 0;
Fred Isaman0b7c0152012-04-20 14:47:39 -04001483 data->context = get_nfs_open_context(first->wb_context);
Fred Isaman9ace33c2011-03-23 13:27:45 +00001484 data->res.fattr = &data->fattr;
1485 data->res.verf = &data->verf;
1486 nfs_fattr_init(&data->fattr);
1487}
Fred Isamane0c2b382011-03-23 13:27:53 +00001488EXPORT_SYMBOL_GPL(nfs_init_commit);
Fred Isaman9ace33c2011-03-23 13:27:45 +00001489
Fred Isamane0c2b382011-03-23 13:27:53 +00001490void nfs_retry_commit(struct list_head *page_list,
Fred Isamanea2cf222012-04-20 14:47:53 -04001491 struct pnfs_layout_segment *lseg,
1492 struct nfs_commit_info *cinfo)
Fred Isaman64bfeb42011-03-23 13:27:47 +00001493{
1494 struct nfs_page *req;
1495
1496 while (!list_empty(page_list)) {
1497 req = nfs_list_entry(page_list->next);
1498 nfs_list_remove_request(req);
Fred Isamanea2cf222012-04-20 14:47:53 -04001499 nfs_mark_request_commit(req, lseg, cinfo);
Fred Isaman56f9cd62012-04-20 14:47:56 -04001500 if (!cinfo->dreq) {
1501 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Mel Gormand56b4dd2012-07-31 16:45:06 -07001502 dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
Fred Isaman56f9cd62012-04-20 14:47:56 -04001503 BDI_RECLAIMABLE);
1504 }
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001505 nfs_unlock_and_release_request(req);
Fred Isaman64bfeb42011-03-23 13:27:47 +00001506 }
1507}
Fred Isamane0c2b382011-03-23 13:27:53 +00001508EXPORT_SYMBOL_GPL(nfs_retry_commit);
Fred Isaman64bfeb42011-03-23 13:27:47 +00001509
Fred Isaman9ace33c2011-03-23 13:27:45 +00001510/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 * Commit dirty pages
1512 */
1513static int
Fred Isamanea2cf222012-04-20 14:47:53 -04001514nfs_commit_list(struct inode *inode, struct list_head *head, int how,
1515 struct nfs_commit_info *cinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001517 struct nfs_commit_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001519 data = nfs_commitdata_alloc();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520
1521 if (!data)
1522 goto out_bad;
1523
1524 /* Set up the argument struct */
Fred Isamanf453a542012-04-20 14:47:54 -04001525 nfs_init_commit(data, head, NULL, cinfo);
1526 atomic_inc(&cinfo->mds->rpcs_out);
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001527 return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops,
1528 how, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 out_bad:
Fred Isamanea2cf222012-04-20 14:47:53 -04001530 nfs_retry_commit(head, NULL, cinfo);
Fred Isamanf453a542012-04-20 14:47:54 -04001531 cinfo->completion_ops->error_cleanup(NFS_I(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 return -ENOMEM;
1533}
1534
1535/*
1536 * COMMIT call returned
1537 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001538static void nfs_commit_done(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001540 struct nfs_commit_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541
Chuck Levera3f565b2007-01-31 12:14:01 -05001542 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 task->tk_pid, task->tk_status);
1544
Trond Myklebust788e7a82006-03-20 13:44:27 -05001545 /* Call the NFS version-specific code */
Trond Myklebustc0d0e962011-04-12 12:29:15 -04001546 NFS_PROTO(data->inode)->commit_done(task, data);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001547}
1548
Fred Isamanf453a542012-04-20 14:47:54 -04001549static void nfs_commit_release_pages(struct nfs_commit_data *data)
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001550{
Fred Isaman5917ce82011-03-23 13:27:48 +00001551 struct nfs_page *req;
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001552 int status = data->task.tk_status;
Fred Isamanf453a542012-04-20 14:47:54 -04001553 struct nfs_commit_info cinfo;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001554
Linus Torvalds1da177e2005-04-16 15:20:36 -07001555 while (!list_empty(&data->pages)) {
1556 req = nfs_list_entry(data->pages.next);
1557 nfs_list_remove_request(req);
Fred Isamand6d6dc72012-03-08 17:29:35 -05001558 nfs_clear_page_commit(req->wb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559
Chuck Lever48186c72008-06-11 17:56:05 -04001560 dprintk("NFS: commit (%s/%lld %d@%lld)",
Al Viro3d4ff432011-06-22 18:40:12 -04001561 req->wb_context->dentry->d_sb->s_id,
1562 (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563 req->wb_bytes,
1564 (long long)req_offset(req));
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001565 if (status < 0) {
1566 nfs_context_set_write_error(req->wb_context, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567 nfs_inode_remove_request(req);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001568 dprintk(", error = %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 goto next;
1570 }
1571
1572 /* Okay, COMMIT succeeded, apparently. Check the verifier
1573 * returned by the server against all stored verfs. */
Trond Myklebust2f2c63b2012-06-08 11:56:09 -04001574 if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 /* We have a match */
1576 nfs_inode_remove_request(req);
1577 dprintk(" OK\n");
1578 goto next;
1579 }
1580 /* We have a mismatch. Write the page again */
1581 dprintk(" mismatch\n");
Fred6d884e82008-03-19 11:24:38 -04001582 nfs_mark_request_dirty(req);
Trond Myklebust05990d12012-09-11 16:01:22 -04001583 set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 next:
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001585 nfs_unlock_and_release_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586 }
Fred Isamanf453a542012-04-20 14:47:54 -04001587 nfs_init_cinfo(&cinfo, data->inode, data->dreq);
1588 if (atomic_dec_and_test(&cinfo.mds->rpcs_out))
1589 nfs_commit_clear_lock(NFS_I(data->inode));
Fred Isaman5917ce82011-03-23 13:27:48 +00001590}
1591
1592static void nfs_commit_release(void *calldata)
1593{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001594 struct nfs_commit_data *data = calldata;
Fred Isaman5917ce82011-03-23 13:27:48 +00001595
Fred Isamanf453a542012-04-20 14:47:54 -04001596 data->completion_ops->completion(data);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001597 nfs_commitdata_release(calldata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598}
Trond Myklebust788e7a82006-03-20 13:44:27 -05001599
1600static const struct rpc_call_ops nfs_commit_ops = {
Fred Isaman0b7c0152012-04-20 14:47:39 -04001601 .rpc_call_prepare = nfs_commit_prepare,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001602 .rpc_call_done = nfs_commit_done,
1603 .rpc_release = nfs_commit_release,
1604};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605
Fred Isamanf453a542012-04-20 14:47:54 -04001606static const struct nfs_commit_completion_ops nfs_commit_completion_ops = {
1607 .completion = nfs_commit_release_pages,
1608 .error_cleanup = nfs_commit_clear_lock,
1609};
1610
Fred Isaman1763da12012-04-20 14:47:57 -04001611int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
1612 int how, struct nfs_commit_info *cinfo)
Fred Isaman84c53ab2012-04-20 14:47:52 -04001613{
1614 int status;
1615
Fred Isamanea2cf222012-04-20 14:47:53 -04001616 status = pnfs_commit_list(inode, head, how, cinfo);
Fred Isaman84c53ab2012-04-20 14:47:52 -04001617 if (status == PNFS_NOT_ATTEMPTED)
Fred Isamanea2cf222012-04-20 14:47:53 -04001618 status = nfs_commit_list(inode, head, how, cinfo);
Fred Isaman84c53ab2012-04-20 14:47:52 -04001619 return status;
1620}
1621
Trond Myklebustb608b282010-07-30 15:31:54 -04001622int nfs_commit_inode(struct inode *inode, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001623{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 LIST_HEAD(head);
Fred Isamanea2cf222012-04-20 14:47:53 -04001625 struct nfs_commit_info cinfo;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001626 int may_wait = how & FLUSH_SYNC;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001627 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001628
Trond Myklebustb8413f92011-03-21 15:37:01 -04001629 res = nfs_commit_set_lock(NFS_I(inode), may_wait);
1630 if (res <= 0)
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001631 goto out_mark_dirty;
Fred Isamanea2cf222012-04-20 14:47:53 -04001632 nfs_init_cinfo_from_inode(&cinfo, inode);
1633 res = nfs_scan_commit(inode, &head, &cinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634 if (res) {
Fred Isamana861a1e2011-03-23 13:27:51 +00001635 int error;
1636
Fred Isamanea2cf222012-04-20 14:47:53 -04001637 error = nfs_generic_commit_list(inode, &head, how, &cinfo);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001638 if (error < 0)
1639 return error;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001640 if (!may_wait)
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001641 goto out_mark_dirty;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001642 error = wait_on_bit(&NFS_I(inode)->flags,
1643 NFS_INO_COMMIT,
1644 nfs_wait_bit_killable,
1645 TASK_KILLABLE);
1646 if (error < 0)
1647 return error;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001648 } else
1649 nfs_commit_clear_lock(NFS_I(inode));
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001650 return res;
1651 /* Note: If we exit without ensuring that the commit is complete,
1652 * we must mark the inode as dirty. Otherwise, future calls to
1653 * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
1654 * that the data is on the disk.
1655 */
1656out_mark_dirty:
1657 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001658 return res;
1659}
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001660
1661static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1662{
Trond Myklebust420e3642010-02-19 17:00:02 -08001663 struct nfs_inode *nfsi = NFS_I(inode);
1664 int flags = FLUSH_SYNC;
1665 int ret = 0;
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001666
Jeff Layton3236c3e2011-10-11 09:49:21 -04001667 /* no commits means nothing needs to be done */
Fred Isamanea2cf222012-04-20 14:47:53 -04001668 if (!nfsi->commit_info.ncommit)
Jeff Layton3236c3e2011-10-11 09:49:21 -04001669 return ret;
1670
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001671 if (wbc->sync_mode == WB_SYNC_NONE) {
1672 /* Don't commit yet if this is a non-blocking flush and there
1673 * are a lot of outstanding writes for this mapping.
1674 */
Fred Isamanea2cf222012-04-20 14:47:53 -04001675 if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1))
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001676 goto out_mark_dirty;
Trond Myklebust420e3642010-02-19 17:00:02 -08001677
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001678 /* don't wait for the COMMIT response */
Trond Myklebust420e3642010-02-19 17:00:02 -08001679 flags = 0;
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001680 }
1681
Trond Myklebust420e3642010-02-19 17:00:02 -08001682 ret = nfs_commit_inode(inode, flags);
1683 if (ret >= 0) {
1684 if (wbc->sync_mode == WB_SYNC_NONE) {
1685 if (ret < wbc->nr_to_write)
1686 wbc->nr_to_write -= ret;
1687 else
1688 wbc->nr_to_write = 0;
1689 }
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001690 return 0;
Trond Myklebust420e3642010-02-19 17:00:02 -08001691 }
1692out_mark_dirty:
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001693 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1694 return ret;
1695}
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001696#else
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001697static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1698{
1699 return 0;
1700}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701#endif
1702
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001703int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1704{
Bryan Schumakera8d8f022012-06-20 15:53:49 -04001705 return nfs_commit_unstable_pages(inode, wbc);
1706}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001707EXPORT_SYMBOL_GPL(nfs_write_inode);
Andy Adamson863a3c62011-03-23 13:27:54 +00001708
Trond Myklebustacdc53b2010-02-19 17:03:26 -08001709/*
1710 * flush the inode to disk.
1711 */
1712int nfs_wb_all(struct inode *inode)
Trond Myklebust34901f72007-07-25 14:09:54 -04001713{
1714 struct writeback_control wbc = {
Trond Myklebust72cb77f2009-03-11 14:10:30 -04001715 .sync_mode = WB_SYNC_ALL,
Trond Myklebust34901f72007-07-25 14:09:54 -04001716 .nr_to_write = LONG_MAX,
Trond Myklebustd7fb1202008-10-06 20:08:56 -04001717 .range_start = 0,
1718 .range_end = LLONG_MAX,
Trond Myklebust34901f72007-07-25 14:09:54 -04001719 };
Trond Myklebust34901f72007-07-25 14:09:54 -04001720
Trond Myklebustacdc53b2010-02-19 17:03:26 -08001721 return sync_inode(inode, &wbc);
Trond Myklebust1c759502006-10-09 16:18:38 -04001722}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001723EXPORT_SYMBOL_GPL(nfs_wb_all);
Trond Myklebust1c759502006-10-09 16:18:38 -04001724
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001725int nfs_wb_page_cancel(struct inode *inode, struct page *page)
1726{
1727 struct nfs_page *req;
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001728 int ret = 0;
1729
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001730 for (;;) {
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001731 wait_on_page_writeback(page);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001732 req = nfs_page_find_request(page);
1733 if (req == NULL)
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001734 break;
Trond Myklebust7ad84aa2012-05-09 13:19:15 -04001735 if (nfs_lock_request(req)) {
Trond Myklebust8dd37752012-03-15 17:16:40 -04001736 nfs_clear_request_commit(req);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001737 nfs_inode_remove_request(req);
1738 /*
1739 * In case nfs_inode_remove_request has marked the
1740 * page as being dirty
1741 */
1742 cancel_dirty_page(page, PAGE_CACHE_SIZE);
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001743 nfs_unlock_and_release_request(req);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001744 break;
1745 }
1746 ret = nfs_wait_on_request(req);
Trond Myklebustc9edda72010-01-26 15:41:34 -05001747 nfs_release_request(req);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001748 if (ret < 0)
Trond Myklebustc9889502010-02-19 17:03:21 -08001749 break;
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001750 }
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001751 return ret;
1752}
1753
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001754/*
1755 * Write back all requests on one page - we do this before reading it.
1756 */
1757int nfs_wb_page(struct inode *inode, struct page *page)
Trond Myklebust1c759502006-10-09 16:18:38 -04001758{
Mel Gorman29418aa2012-07-31 16:45:10 -07001759 loff_t range_start = page_file_offset(page);
Trond Myklebust1c759502006-10-09 16:18:38 -04001760 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001761 struct writeback_control wbc = {
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001762 .sync_mode = WB_SYNC_ALL,
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001763 .nr_to_write = 0,
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001764 .range_start = range_start,
1765 .range_end = range_end,
1766 };
1767 int ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001768
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001769 for (;;) {
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001770 wait_on_page_writeback(page);
Trond Myklebust73e33022008-04-11 16:03:54 -04001771 if (clear_page_dirty_for_io(page)) {
1772 ret = nfs_writepage_locked(page, &wbc);
1773 if (ret < 0)
1774 goto out_error;
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001775 continue;
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001776 }
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001777 if (!PagePrivate(page))
1778 break;
1779 ret = nfs_commit_inode(inode, FLUSH_SYNC);
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001780 if (ret < 0)
Trond Myklebust73e33022008-04-11 16:03:54 -04001781 goto out_error;
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001782 }
Trond Myklebust73e33022008-04-11 16:03:54 -04001783 return 0;
1784out_error:
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001785 return ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001786}
1787
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001788#ifdef CONFIG_MIGRATION
1789int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
Mel Gormana6bc32b2012-01-12 17:19:43 -08001790 struct page *page, enum migrate_mode mode)
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001791{
Jeff Layton2da95652011-10-12 10:57:42 -04001792 /*
1793 * If PagePrivate is set, then the page is currently associated with
1794 * an in-progress read or write request. Don't try to migrate it.
1795 *
1796 * FIXME: we could do this in principle, but we'll need a way to ensure
1797 * that we can safely release the inode reference while holding
1798 * the page lock.
1799 */
1800 if (PagePrivate(page))
1801 return -EBUSY;
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001802
David Howells8c209ce2012-12-05 13:34:49 +00001803 if (!nfs_fscache_release_page(page, GFP_KERNEL))
1804 return -EBUSY;
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001805
Mel Gormana6bc32b2012-01-12 17:19:43 -08001806 return migrate_page(mapping, newpage, page, mode);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001807}
1808#endif
1809
David Howellsf7b422b2006-06-09 09:34:33 -04001810int __init nfs_init_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811{
1812 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
Fred Isamancd841602012-04-20 14:47:44 -04001813 sizeof(struct nfs_write_header),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001815 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816 if (nfs_wdata_cachep == NULL)
1817 return -ENOMEM;
1818
Matthew Dobson93d23412006-03-26 01:37:50 -08001819 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1820 nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 if (nfs_wdata_mempool == NULL)
Jeff Layton3dd47652012-08-02 14:30:56 -04001822 goto out_destroy_write_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823
Fred Isaman0b7c0152012-04-20 14:47:39 -04001824 nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
1825 sizeof(struct nfs_commit_data),
1826 0, SLAB_HWCACHE_ALIGN,
1827 NULL);
1828 if (nfs_cdata_cachep == NULL)
Jeff Layton3dd47652012-08-02 14:30:56 -04001829 goto out_destroy_write_mempool;
Fred Isaman0b7c0152012-04-20 14:47:39 -04001830
Matthew Dobson93d23412006-03-26 01:37:50 -08001831 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
Yanchuan Nian4c100212012-11-12 09:27:37 +08001832 nfs_cdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 if (nfs_commit_mempool == NULL)
Jeff Layton3dd47652012-08-02 14:30:56 -04001834 goto out_destroy_commit_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835
Peter Zijlstra89a09142007-03-16 13:38:26 -08001836 /*
1837 * NFS congestion size, scale with available memory.
1838 *
1839 * 64MB: 8192k
1840 * 128MB: 11585k
1841 * 256MB: 16384k
1842 * 512MB: 23170k
1843 * 1GB: 32768k
1844 * 2GB: 46340k
1845 * 4GB: 65536k
1846 * 8GB: 92681k
1847 * 16GB: 131072k
1848 *
1849 * This allows larger machines to have larger/more transfers.
1850 * Limit the default to 256M
1851 */
1852 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
1853 if (nfs_congestion_kb > 256*1024)
1854 nfs_congestion_kb = 256*1024;
1855
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 return 0;
Jeff Layton3dd47652012-08-02 14:30:56 -04001857
1858out_destroy_commit_cache:
1859 kmem_cache_destroy(nfs_cdata_cachep);
1860out_destroy_write_mempool:
1861 mempool_destroy(nfs_wdata_mempool);
1862out_destroy_write_cache:
1863 kmem_cache_destroy(nfs_wdata_cachep);
1864 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001865}
1866
David Brownell266bee82006-06-27 12:59:15 -07001867void nfs_destroy_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001868{
1869 mempool_destroy(nfs_commit_mempool);
Jeff Layton3dd47652012-08-02 14:30:56 -04001870 kmem_cache_destroy(nfs_cdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 mempool_destroy(nfs_wdata_mempool);
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001872 kmem_cache_destroy(nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873}
1874