blob: ac1dc331ba31212108cd5c93352ecdb620122690 [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
Trond Myklebustf4ce1292013-08-19 18:59:33 -040034#include "nfstrace.h"
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#define NFSDBG_FACILITY NFSDBG_PAGECACHE
37
38#define MIN_POOL_WRITE (32)
39#define MIN_POOL_COMMIT (4)
40
41/*
42 * Local function declarations
43 */
Fred Isamanf8512ad2008-03-19 11:24:39 -040044static void nfs_redirty_request(struct nfs_page *req);
Fred Isaman6c75dc02012-04-20 14:47:47 -040045static const struct rpc_call_ops nfs_write_common_ops;
Trond Myklebust788e7a82006-03-20 13:44:27 -050046static const struct rpc_call_ops nfs_commit_ops;
Fred Isaman061ae2e2012-04-20 14:47:48 -040047static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;
Fred Isamanf453a542012-04-20 14:47:54 -040048static const struct nfs_commit_completion_ops nfs_commit_completion_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Christoph Lametere18b8902006-12-06 20:33:20 -080050static struct kmem_cache *nfs_wdata_cachep;
Trond Myklebust3feb2d42006-03-20 13:44:37 -050051static mempool_t *nfs_wdata_mempool;
Fred Isaman0b7c0152012-04-20 14:47:39 -040052static struct kmem_cache *nfs_cdata_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053static mempool_t *nfs_commit_mempool;
54
Fred Isaman0b7c0152012-04-20 14:47:39 -040055struct nfs_commit_data *nfs_commitdata_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Mel Gorman192e5012012-07-31 16:45:16 -070057 struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO);
Chuck Lever40859d72005-11-30 18:09:02 -050058
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 if (p) {
60 memset(p, 0, sizeof(*p));
61 INIT_LIST_HEAD(&p->pages);
62 }
63 return p;
64}
Fred Isamane0c2b382011-03-23 13:27:53 +000065EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Fred Isaman0b7c0152012-04-20 14:47:39 -040067void nfs_commit_free(struct nfs_commit_data *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
69 mempool_free(p, nfs_commit_mempool);
70}
Fred Isamane0c2b382011-03-23 13:27:53 +000071EXPORT_SYMBOL_GPL(nfs_commit_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Fred Isaman6c75dc02012-04-20 14:47:47 -040073struct nfs_write_header *nfs_writehdr_alloc(void)
Trond Myklebust3feb2d42006-03-20 13:44:37 -050074{
Mel Gorman192e5012012-07-31 16:45:16 -070075 struct nfs_write_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
Trond Myklebust3feb2d42006-03-20 13:44:37 -050076
77 if (p) {
Fred Isamancd841602012-04-20 14:47:44 -040078 struct nfs_pgio_header *hdr = &p->header;
Fred Isamancd841602012-04-20 14:47:44 -040079
Trond Myklebust3feb2d42006-03-20 13:44:37 -050080 memset(p, 0, sizeof(*p));
Fred Isamancd841602012-04-20 14:47:44 -040081 INIT_LIST_HEAD(&hdr->pages);
Fred Isaman6c75dc02012-04-20 14:47:47 -040082 INIT_LIST_HEAD(&hdr->rpc_list);
83 spin_lock_init(&hdr->lock);
84 atomic_set(&hdr->refcnt, 0);
Trond Myklebust9bce0082012-06-05 18:32:03 -040085 hdr->verf = &p->verf;
Trond Myklebust3feb2d42006-03-20 13:44:37 -050086 }
87 return p;
88}
Bryan Schumaker89d77c82012-07-30 16:05:25 -040089EXPORT_SYMBOL_GPL(nfs_writehdr_alloc);
Trond Myklebust3feb2d42006-03-20 13:44:37 -050090
Fred Isaman1763da12012-04-20 14:47:57 -040091static struct nfs_write_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr,
92 unsigned int pagecount)
Fred Isaman6c75dc02012-04-20 14:47:47 -040093{
94 struct nfs_write_data *data, *prealloc;
95
96 prealloc = &container_of(hdr, struct nfs_write_header, header)->rpc_data;
97 if (prealloc->header == NULL)
98 data = prealloc;
99 else
100 data = kzalloc(sizeof(*data), GFP_KERNEL);
101 if (!data)
102 goto out;
103
104 if (nfs_pgarray_set(&data->pages, pagecount)) {
105 data->header = hdr;
106 atomic_inc(&hdr->refcnt);
107 } else {
108 if (data != prealloc)
109 kfree(data);
110 data = NULL;
111 }
112out:
113 return data;
114}
115
Fred Isamancd841602012-04-20 14:47:44 -0400116void nfs_writehdr_free(struct nfs_pgio_header *hdr)
Trond Myklebust3feb2d42006-03-20 13:44:37 -0500117{
Fred Isamancd841602012-04-20 14:47:44 -0400118 struct nfs_write_header *whdr = container_of(hdr, struct nfs_write_header, header);
119 mempool_free(whdr, nfs_wdata_mempool);
Trond Myklebust3feb2d42006-03-20 13:44:37 -0500120}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400121EXPORT_SYMBOL_GPL(nfs_writehdr_free);
Trond Myklebust3feb2d42006-03-20 13:44:37 -0500122
Trond Myklebustdce81292011-07-13 15:59:19 -0400123void nfs_writedata_release(struct nfs_write_data *wdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124{
Fred Isaman6c75dc02012-04-20 14:47:47 -0400125 struct nfs_pgio_header *hdr = wdata->header;
126 struct nfs_write_header *write_header = container_of(hdr, struct nfs_write_header, header);
127
Trond Myklebust383ba712008-02-19 20:04:20 -0500128 put_nfs_open_context(wdata->args.context);
Fred Isaman30dd3742012-04-20 14:47:45 -0400129 if (wdata->pages.pagevec != wdata->pages.page_array)
130 kfree(wdata->pages.pagevec);
Trond Myklebust6db6dd72013-01-04 12:47:04 -0500131 if (wdata == &write_header->rpc_data) {
Fred Isaman6c75dc02012-04-20 14:47:47 -0400132 wdata->header = NULL;
Trond Myklebust6db6dd72013-01-04 12:47:04 -0500133 wdata = NULL;
134 }
Fred Isaman6c75dc02012-04-20 14:47:47 -0400135 if (atomic_dec_and_test(&hdr->refcnt))
Fred Isaman061ae2e2012-04-20 14:47:48 -0400136 hdr->completion_ops->completion(hdr);
Trond Myklebust6db6dd72013-01-04 12:47:04 -0500137 /* Note: we only free the rpc_task after callbacks are done.
138 * See the comment in rpc_free_task() for why
139 */
140 kfree(wdata);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141}
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400142EXPORT_SYMBOL_GPL(nfs_writedata_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400144static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
145{
146 ctx->error = error;
147 smp_wmb();
148 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
149}
150
Mel Gorman29418aa2012-07-31 16:45:10 -0700151static struct nfs_page *
152nfs_page_find_request_locked(struct nfs_inode *nfsi, struct page *page)
Trond Myklebust277459d2006-12-05 00:35:35 -0500153{
154 struct nfs_page *req = NULL;
155
Mel Gorman29418aa2012-07-31 16:45:10 -0700156 if (PagePrivate(page))
Trond Myklebust277459d2006-12-05 00:35:35 -0500157 req = (struct nfs_page *)page_private(page);
Mel Gorman29418aa2012-07-31 16:45:10 -0700158 else if (unlikely(PageSwapCache(page))) {
159 struct nfs_page *freq, *t;
160
161 /* Linearly search the commit list for the correct req */
162 list_for_each_entry_safe(freq, t, &nfsi->commit_info.list, wb_list) {
163 if (freq->wb_page == page) {
164 req = freq;
165 break;
166 }
167 }
Trond Myklebust277459d2006-12-05 00:35:35 -0500168 }
Mel Gorman29418aa2012-07-31 16:45:10 -0700169
170 if (req)
171 kref_get(&req->wb_kref);
172
Trond Myklebust277459d2006-12-05 00:35:35 -0500173 return req;
174}
175
176static struct nfs_page *nfs_page_find_request(struct page *page)
177{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700178 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebust277459d2006-12-05 00:35:35 -0500179 struct nfs_page *req = NULL;
Trond Myklebust277459d2006-12-05 00:35:35 -0500180
Trond Myklebust587142f2007-07-02 09:57:54 -0400181 spin_lock(&inode->i_lock);
Mel Gorman29418aa2012-07-31 16:45:10 -0700182 req = nfs_page_find_request_locked(NFS_I(inode), page);
Trond Myklebust587142f2007-07-02 09:57:54 -0400183 spin_unlock(&inode->i_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500184 return req;
185}
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187/* Adjust the file length if we're writing beyond the end */
188static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
189{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700190 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebusta3d01452008-06-11 12:21:19 -0400191 loff_t end, i_size;
192 pgoff_t end_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Trond Myklebusta3d01452008-06-11 12:21:19 -0400194 spin_lock(&inode->i_lock);
195 i_size = i_size_read(inode);
196 end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
Mel Gormand56b4dd2012-07-31 16:45:06 -0700197 if (i_size > 0 && page_file_index(page) < end_index)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400198 goto out;
Mel Gormand56b4dd2012-07-31 16:45:06 -0700199 end = page_file_offset(page) + ((loff_t)offset+count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 if (i_size >= end)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400201 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 i_size_write(inode, end);
Trond Myklebusta3d01452008-06-11 12:21:19 -0400203 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
204out:
205 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
Trond Myklebusta301b772007-02-06 11:07:15 -0800208/* A writeback failed: mark the page as bad, and invalidate the page cache */
209static void nfs_set_pageerror(struct page *page)
210{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700211 nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
Trond Myklebusta301b772007-02-06 11:07:15 -0800212}
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214/* We can set the PG_uptodate flag if we see that a write request
215 * covers the full page.
216 */
217static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
218{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 if (PageUptodate(page))
220 return;
221 if (base != 0)
222 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500223 if (count != nfs_page_length(page))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return;
Trond Myklebust49a70f22006-12-05 00:35:38 -0500225 SetPageUptodate(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226}
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228static int wb_priority(struct writeback_control *wbc)
229{
230 if (wbc->for_reclaim)
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400231 return FLUSH_HIGHPRI | FLUSH_STABLE;
Wu Fengguangb17621f2009-12-03 13:54:25 +0100232 if (wbc->for_kupdate || wbc->for_background)
Trond Myklebustb31268a2011-03-21 17:02:00 -0400233 return FLUSH_LOWPRI | FLUSH_COND_STABLE;
234 return FLUSH_COND_STABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
237/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800238 * NFS congestion control
239 */
240
241int nfs_congestion_kb;
242
243#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
244#define NFS_CONGESTION_OFF_THRESH \
245 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
246
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400247static void nfs_set_page_writeback(struct page *page)
Peter Zijlstra89a09142007-03-16 13:38:26 -0800248{
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400249 struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host);
Trond Myklebust5a6d41b2007-04-14 19:10:12 -0400250 int ret = test_set_page_writeback(page);
251
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400252 WARN_ON_ONCE(ret != 0);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800253
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400254 if (atomic_long_inc_return(&nfss->writeback) >
255 NFS_CONGESTION_ON_THRESH) {
256 set_bdi_congested(&nfss->backing_dev_info,
257 BLK_RW_ASYNC);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800258 }
259}
260
261static void nfs_end_page_writeback(struct page *page)
262{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700263 struct inode *inode = page_file_mapping(page)->host;
Peter Zijlstra89a09142007-03-16 13:38:26 -0800264 struct nfs_server *nfss = NFS_SERVER(inode);
265
266 end_page_writeback(page);
Peter Zijlstrac4dc4be2007-10-16 23:25:41 -0700267 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
Jens Axboe8aa7e842009-07-09 14:52:32 +0200268 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800269}
270
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400271static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
Trond Myklebuste261f512006-12-05 00:35:41 -0500272{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700273 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebuste261f512006-12-05 00:35:41 -0500274 struct nfs_page *req;
Trond Myklebuste261f512006-12-05 00:35:41 -0500275 int ret;
276
Trond Myklebust587142f2007-07-02 09:57:54 -0400277 spin_lock(&inode->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400278 for (;;) {
Mel Gorman29418aa2012-07-31 16:45:10 -0700279 req = nfs_page_find_request_locked(NFS_I(inode), page);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400280 if (req == NULL)
281 break;
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400282 if (nfs_lock_request(req))
Trond Myklebuste261f512006-12-05 00:35:41 -0500283 break;
284 /* Note: If we hold the page lock, as is the case in nfs_writepage,
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400285 * then the call to nfs_lock_request() will always
Trond Myklebuste261f512006-12-05 00:35:41 -0500286 * succeed provided that someone hasn't already marked the
287 * request as dirty (in which case we don't care).
288 */
Trond Myklebust587142f2007-07-02 09:57:54 -0400289 spin_unlock(&inode->i_lock);
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400290 if (!nonblock)
291 ret = nfs_wait_on_request(req);
292 else
293 ret = -EAGAIN;
Trond Myklebuste261f512006-12-05 00:35:41 -0500294 nfs_release_request(req);
295 if (ret != 0)
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400296 return ERR_PTR(ret);
Trond Myklebust587142f2007-07-02 09:57:54 -0400297 spin_lock(&inode->i_lock);
Trond Myklebuste261f512006-12-05 00:35:41 -0500298 }
Trond Myklebust587142f2007-07-02 09:57:54 -0400299 spin_unlock(&inode->i_lock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400300 return req;
301}
302
303/*
304 * Find an associated nfs write request, and prepare to flush it out
305 * May return an error if the user signalled nfs_wait_on_request().
306 */
307static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400308 struct page *page, bool nonblock)
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400309{
310 struct nfs_page *req;
311 int ret = 0;
312
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400313 req = nfs_find_and_lock_request(page, nonblock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400314 if (!req)
315 goto out;
316 ret = PTR_ERR(req);
317 if (IS_ERR(req))
318 goto out;
319
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400320 nfs_set_page_writeback(page);
321 WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400322
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400323 ret = 0;
Fred Isamanf8512ad2008-03-19 11:24:39 -0400324 if (!nfs_pageio_add_request(pgio, req)) {
325 nfs_redirty_request(req);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400326 ret = pgio->pg_error;
Fred Isamanf8512ad2008-03-19 11:24:39 -0400327 }
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400328out:
329 return ret;
Trond Myklebuste261f512006-12-05 00:35:41 -0500330}
331
Trond Myklebustf758c8852007-07-22 19:27:32 -0400332static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
333{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700334 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400335 int ret;
Trond Myklebustf758c8852007-07-22 19:27:32 -0400336
337 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
338 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
339
Mel Gormand56b4dd2012-07-31 16:45:06 -0700340 nfs_pageio_cond_complete(pgio, page_file_index(page));
Wu Fengguang1b430be2010-10-26 14:21:26 -0700341 ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400342 if (ret == -EAGAIN) {
343 redirty_page_for_writepage(wbc, page);
344 ret = 0;
345 }
346 return ret;
Trond Myklebustf758c8852007-07-22 19:27:32 -0400347}
348
Trond Myklebuste261f512006-12-05 00:35:41 -0500349/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 * Write an mmapped page to the server.
351 */
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500352static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400354 struct nfs_pageio_descriptor pgio;
Trond Myklebuste261f512006-12-05 00:35:41 -0500355 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
Mel Gormand56b4dd2012-07-31 16:45:06 -0700357 NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio,
Bryan Schumaker57208fa2012-06-20 15:53:48 -0400358 page->mapping->host,
359 wb_priority(wbc),
360 &nfs_async_write_completion_ops);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400361 err = nfs_do_writepage(page, wbc, &pgio);
362 nfs_pageio_complete(&pgio);
363 if (err < 0)
364 return err;
365 if (pgio.pg_error < 0)
366 return pgio.pg_error;
367 return 0;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500368}
369
370int nfs_writepage(struct page *page, struct writeback_control *wbc)
371{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400372 int ret;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500373
Trond Myklebustf758c8852007-07-22 19:27:32 -0400374 ret = nfs_writepage_locked(page, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 unlock_page(page);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400376 return ret;
377}
378
379static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
380{
381 int ret;
382
383 ret = nfs_do_writepage(page, wbc, data);
384 unlock_page(page);
385 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386}
387
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
389{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 struct inode *inode = mapping->host;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400391 unsigned long *bitlock = &NFS_I(inode)->flags;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400392 struct nfs_pageio_descriptor pgio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 int err;
394
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400395 /* Stop dirtying of new pages while we sync */
396 err = wait_on_bit_lock(bitlock, NFS_INO_FLUSHING,
397 nfs_wait_bit_killable, TASK_KILLABLE);
398 if (err)
399 goto out_err;
400
Chuck Lever91d5b472006-03-20 13:44:14 -0500401 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
402
Bryan Schumaker57208fa2012-06-20 15:53:48 -0400403 NFS_PROTO(inode)->write_pageio_init(&pgio, inode, wb_priority(wbc), &nfs_async_write_completion_ops);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400404 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400405 nfs_pageio_complete(&pgio);
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400406
407 clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
408 smp_mb__after_clear_bit();
409 wake_up_bit(bitlock, NFS_INO_FLUSHING);
410
Trond Myklebustf758c8852007-07-22 19:27:32 -0400411 if (err < 0)
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400412 goto out_err;
413 err = pgio.pg_error;
414 if (err < 0)
415 goto out_err;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400416 return 0;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400417out_err:
418 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419}
420
421/*
422 * Insert a write request into an inode
423 */
Fred Isamand6d6dc72012-03-08 17:29:35 -0500424static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425{
426 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400427
428 /* Lock the request! */
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400429 nfs_lock_request(req);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400430
431 spin_lock(&inode->i_lock);
Bryan Schumaker011e2a72012-06-20 15:53:43 -0400432 if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
Trond Myklebusta9a4a872011-10-17 16:08:46 -0700433 inode->i_version++;
Mel Gorman29418aa2012-07-31 16:45:10 -0700434 /*
435 * Swap-space should not get truncated. Hence no need to plug the race
436 * with invalidate/truncate.
437 */
438 if (likely(!PageSwapCache(req->wb_page))) {
439 set_bit(PG_MAPPED, &req->wb_flags);
440 SetPagePrivate(req->wb_page);
441 set_page_private(req->wb_page, (unsigned long)req);
442 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 nfsi->npages++;
Trond Myklebustc03b4022007-06-17 13:26:38 -0400444 kref_get(&req->wb_kref);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400445 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446}
447
448/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800449 * Remove a write request from an inode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 */
451static void nfs_inode_remove_request(struct nfs_page *req)
452{
Al Viro3d4ff432011-06-22 18:40:12 -0400453 struct inode *inode = req->wb_context->dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 struct nfs_inode *nfsi = NFS_I(inode);
455
Trond Myklebust587142f2007-07-02 09:57:54 -0400456 spin_lock(&inode->i_lock);
Mel Gorman29418aa2012-07-31 16:45:10 -0700457 if (likely(!PageSwapCache(req->wb_page))) {
458 set_page_private(req->wb_page, 0);
459 ClearPagePrivate(req->wb_page);
460 clear_bit(PG_MAPPED, &req->wb_flags);
461 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 nfsi->npages--;
Trond Myklebust4d65c522011-03-25 14:15:11 -0400463 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 nfs_release_request(req);
465}
466
Trond Myklebust61822ab2006-12-05 00:35:42 -0500467static void
Fred6d884e82008-03-19 11:24:38 -0400468nfs_mark_request_dirty(struct nfs_page *req)
Trond Myklebust61822ab2006-12-05 00:35:42 -0500469{
Trond Myklebust61822ab2006-12-05 00:35:42 -0500470 __set_page_dirty_nobuffers(req->wb_page);
471}
472
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400473#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400474/**
475 * nfs_request_add_commit_list - add request to a commit list
476 * @req: pointer to a struct nfs_page
Fred Isamanea2cf222012-04-20 14:47:53 -0400477 * @dst: commit list head
478 * @cinfo: holds list lock and accounting info
Trond Myklebust8dd37752012-03-15 17:16:40 -0400479 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400480 * This sets the PG_CLEAN bit, updates the cinfo count of
Trond Myklebust8dd37752012-03-15 17:16:40 -0400481 * number of outstanding requests requiring a commit as well as
482 * the MM page stats.
483 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400484 * The caller must _not_ hold the cinfo->lock, but must be
Trond Myklebust8dd37752012-03-15 17:16:40 -0400485 * holding the nfs_page lock.
486 */
487void
Fred Isamanea2cf222012-04-20 14:47:53 -0400488nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
489 struct nfs_commit_info *cinfo)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400490{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400491 set_bit(PG_CLEAN, &(req)->wb_flags);
Fred Isamanea2cf222012-04-20 14:47:53 -0400492 spin_lock(cinfo->lock);
493 nfs_list_add_request(req, dst);
494 cinfo->mds->ncommit++;
495 spin_unlock(cinfo->lock);
Fred Isaman56f9cd62012-04-20 14:47:56 -0400496 if (!cinfo->dreq) {
497 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Mel Gormand56b4dd2012-07-31 16:45:06 -0700498 inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
Fred Isaman56f9cd62012-04-20 14:47:56 -0400499 BDI_RECLAIMABLE);
500 __mark_inode_dirty(req->wb_context->dentry->d_inode,
501 I_DIRTY_DATASYNC);
502 }
Trond Myklebust8dd37752012-03-15 17:16:40 -0400503}
504EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
505
506/**
507 * nfs_request_remove_commit_list - Remove request from a commit list
508 * @req: pointer to a nfs_page
Fred Isamanea2cf222012-04-20 14:47:53 -0400509 * @cinfo: holds list lock and accounting info
Trond Myklebust8dd37752012-03-15 17:16:40 -0400510 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400511 * This clears the PG_CLEAN bit, and updates the cinfo's count of
Trond Myklebust8dd37752012-03-15 17:16:40 -0400512 * number of outstanding requests requiring a commit
513 * It does not update the MM page stats.
514 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400515 * The caller _must_ hold the cinfo->lock and the nfs_page lock.
Trond Myklebust8dd37752012-03-15 17:16:40 -0400516 */
517void
Fred Isamanea2cf222012-04-20 14:47:53 -0400518nfs_request_remove_commit_list(struct nfs_page *req,
519 struct nfs_commit_info *cinfo)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400520{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400521 if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
522 return;
523 nfs_list_remove_request(req);
Fred Isamanea2cf222012-04-20 14:47:53 -0400524 cinfo->mds->ncommit--;
Trond Myklebust8dd37752012-03-15 17:16:40 -0400525}
526EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);
527
Fred Isamanea2cf222012-04-20 14:47:53 -0400528static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
529 struct inode *inode)
530{
531 cinfo->lock = &inode->i_lock;
532 cinfo->mds = &NFS_I(inode)->commit_info;
533 cinfo->ds = pnfs_get_ds_info(inode);
Fred Isamanb359f9d2012-04-20 14:47:55 -0400534 cinfo->dreq = NULL;
Fred Isamanf453a542012-04-20 14:47:54 -0400535 cinfo->completion_ops = &nfs_commit_completion_ops;
Fred Isamanea2cf222012-04-20 14:47:53 -0400536}
537
538void nfs_init_cinfo(struct nfs_commit_info *cinfo,
539 struct inode *inode,
540 struct nfs_direct_req *dreq)
541{
Fred Isaman1763da12012-04-20 14:47:57 -0400542 if (dreq)
543 nfs_init_cinfo_from_dreq(cinfo, dreq);
544 else
545 nfs_init_cinfo_from_inode(cinfo, inode);
Fred Isamanea2cf222012-04-20 14:47:53 -0400546}
547EXPORT_SYMBOL_GPL(nfs_init_cinfo);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400548
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549/*
550 * Add a request to the inode's commit list.
551 */
Fred Isaman1763da12012-04-20 14:47:57 -0400552void
Fred Isamanea2cf222012-04-20 14:47:53 -0400553nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
554 struct nfs_commit_info *cinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555{
Fred Isamanea2cf222012-04-20 14:47:53 -0400556 if (pnfs_mark_request_commit(req, lseg, cinfo))
Trond Myklebust8dd37752012-03-15 17:16:40 -0400557 return;
Fred Isamanea2cf222012-04-20 14:47:53 -0400558 nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559}
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400560
Fred Isamand6d6dc72012-03-08 17:29:35 -0500561static void
562nfs_clear_page_commit(struct page *page)
563{
564 dec_zone_page_state(page, NR_UNSTABLE_NFS);
Mel Gormand56b4dd2012-07-31 16:45:06 -0700565 dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE);
Fred Isamand6d6dc72012-03-08 17:29:35 -0500566}
567
Trond Myklebust8dd37752012-03-15 17:16:40 -0400568static void
Trond Myklebuste468bae2008-06-13 13:25:22 -0400569nfs_clear_request_commit(struct nfs_page *req)
570{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400571 if (test_bit(PG_CLEAN, &req->wb_flags)) {
572 struct inode *inode = req->wb_context->dentry->d_inode;
Fred Isamanea2cf222012-04-20 14:47:53 -0400573 struct nfs_commit_info cinfo;
Trond Myklebuste468bae2008-06-13 13:25:22 -0400574
Fred Isamanea2cf222012-04-20 14:47:53 -0400575 nfs_init_cinfo_from_inode(&cinfo, inode);
576 if (!pnfs_clear_request_commit(req, &cinfo)) {
577 spin_lock(cinfo.lock);
578 nfs_request_remove_commit_list(req, &cinfo);
579 spin_unlock(cinfo.lock);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400580 }
Fred Isamand6d6dc72012-03-08 17:29:35 -0500581 nfs_clear_page_commit(req->wb_page);
Trond Myklebuste468bae2008-06-13 13:25:22 -0400582 }
Trond Myklebuste468bae2008-06-13 13:25:22 -0400583}
584
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400585static inline
586int nfs_write_need_commit(struct nfs_write_data *data)
587{
Fred Isaman465d5242011-03-23 13:27:44 +0000588 if (data->verf.committed == NFS_DATA_SYNC)
Fred Isamancd841602012-04-20 14:47:44 -0400589 return data->header->lseg == NULL;
590 return data->verf.committed != NFS_FILE_SYNC;
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400591}
592
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400593#else
Bryan Schumaker68cd6fa2012-04-30 14:30:22 -0400594static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
595 struct inode *inode)
596{
597}
598
599void nfs_init_cinfo(struct nfs_commit_info *cinfo,
600 struct inode *inode,
601 struct nfs_direct_req *dreq)
602{
603}
604
Fred Isaman1763da12012-04-20 14:47:57 -0400605void
Fred Isamanea2cf222012-04-20 14:47:53 -0400606nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
607 struct nfs_commit_info *cinfo)
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400608{
609}
610
Trond Myklebust8dd37752012-03-15 17:16:40 -0400611static void
Trond Myklebuste468bae2008-06-13 13:25:22 -0400612nfs_clear_request_commit(struct nfs_page *req)
613{
Trond Myklebuste468bae2008-06-13 13:25:22 -0400614}
615
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400616static inline
617int nfs_write_need_commit(struct nfs_write_data *data)
618{
619 return 0;
620}
621
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622#endif
623
Fred Isaman061ae2e2012-04-20 14:47:48 -0400624static void nfs_write_completion(struct nfs_pgio_header *hdr)
Fred Isaman6c75dc02012-04-20 14:47:47 -0400625{
Fred Isamanea2cf222012-04-20 14:47:53 -0400626 struct nfs_commit_info cinfo;
Fred Isaman6c75dc02012-04-20 14:47:47 -0400627 unsigned long bytes = 0;
628
629 if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
630 goto out;
Fred Isamanea2cf222012-04-20 14:47:53 -0400631 nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400632 while (!list_empty(&hdr->pages)) {
633 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400634
635 bytes += req->wb_bytes;
636 nfs_list_remove_request(req);
637 if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
638 (hdr->good_bytes < bytes)) {
Trond Myklebustd1182b32012-05-09 13:37:43 -0400639 nfs_set_pageerror(req->wb_page);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400640 nfs_context_set_write_error(req->wb_context, hdr->error);
641 goto remove_req;
642 }
643 if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) {
644 nfs_mark_request_dirty(req);
645 goto next;
646 }
647 if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) {
Trond Myklebust2f2c63b2012-06-08 11:56:09 -0400648 memcpy(&req->wb_verf, &hdr->verf->verifier, sizeof(req->wb_verf));
Fred Isamanea2cf222012-04-20 14:47:53 -0400649 nfs_mark_request_commit(req, hdr->lseg, &cinfo);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400650 goto next;
651 }
652remove_req:
653 nfs_inode_remove_request(req);
654next:
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400655 nfs_unlock_request(req);
Trond Myklebustd1182b32012-05-09 13:37:43 -0400656 nfs_end_page_writeback(req->wb_page);
Trond Myklebust3aff4eb2012-05-09 14:30:35 -0400657 nfs_release_request(req);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400658 }
659out:
660 hdr->release(hdr);
661}
662
Bryan Schumaker89d77c82012-07-30 16:05:25 -0400663#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
Fred Isamanea2cf222012-04-20 14:47:53 -0400664static unsigned long
665nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400666{
Fred Isamanea2cf222012-04-20 14:47:53 -0400667 return cinfo->mds->ncommit;
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400668}
669
Fred Isamanea2cf222012-04-20 14:47:53 -0400670/* cinfo->lock held by caller */
Fred Isaman1763da12012-04-20 14:47:57 -0400671int
Fred Isamanea2cf222012-04-20 14:47:53 -0400672nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
673 struct nfs_commit_info *cinfo, int max)
Fred Isamand6d6dc72012-03-08 17:29:35 -0500674{
675 struct nfs_page *req, *tmp;
676 int ret = 0;
677
678 list_for_each_entry_safe(req, tmp, src, wb_list) {
Trond Myklebust8dd37752012-03-15 17:16:40 -0400679 if (!nfs_lock_request(req))
680 continue;
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400681 kref_get(&req->wb_kref);
Fred Isamanea2cf222012-04-20 14:47:53 -0400682 if (cond_resched_lock(cinfo->lock))
Trond Myklebust3b3be882012-03-17 11:59:30 -0400683 list_safe_reset_next(req, tmp, wb_list);
Fred Isamanea2cf222012-04-20 14:47:53 -0400684 nfs_request_remove_commit_list(req, cinfo);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400685 nfs_list_add_request(req, dst);
686 ret++;
Fred Isaman1763da12012-04-20 14:47:57 -0400687 if ((ret == max) && !cinfo->dreq)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400688 break;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500689 }
690 return ret;
691}
Fred Isamand6d6dc72012-03-08 17:29:35 -0500692
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693/*
694 * nfs_scan_commit - Scan an inode for commit requests
695 * @inode: NFS inode to scan
Fred Isamanea2cf222012-04-20 14:47:53 -0400696 * @dst: mds destination list
697 * @cinfo: mds and ds lists of reqs ready to commit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 *
699 * Moves requests from the inode's 'commit' request list.
700 * The requests are *not* checked to ensure that they form a contiguous set.
701 */
Fred Isaman1763da12012-04-20 14:47:57 -0400702int
Fred Isamanea2cf222012-04-20 14:47:53 -0400703nfs_scan_commit(struct inode *inode, struct list_head *dst,
704 struct nfs_commit_info *cinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705{
Fred Isamand6d6dc72012-03-08 17:29:35 -0500706 int ret = 0;
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400707
Fred Isamanea2cf222012-04-20 14:47:53 -0400708 spin_lock(cinfo->lock);
709 if (cinfo->mds->ncommit > 0) {
Trond Myklebust8dd37752012-03-15 17:16:40 -0400710 const int max = INT_MAX;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500711
Fred Isamanea2cf222012-04-20 14:47:53 -0400712 ret = nfs_scan_commit_list(&cinfo->mds->list, dst,
713 cinfo, max);
714 ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
Fred Isamand6d6dc72012-03-08 17:29:35 -0500715 }
Fred Isamanea2cf222012-04-20 14:47:53 -0400716 spin_unlock(cinfo->lock);
Trond Myklebustff778d02010-02-19 16:53:39 -0800717 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718}
Fred Isamand6d6dc72012-03-08 17:29:35 -0500719
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500720#else
Fred Isamanea2cf222012-04-20 14:47:53 -0400721static unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400722{
723 return 0;
724}
725
Fred Isaman1763da12012-04-20 14:47:57 -0400726int nfs_scan_commit(struct inode *inode, struct list_head *dst,
727 struct nfs_commit_info *cinfo)
Trond Myklebustc42de9d2006-03-20 13:44:51 -0500728{
729 return 0;
730}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731#endif
732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733/*
Trond Myklebuste7d39062008-06-13 12:12:32 -0400734 * Search for an existing write request, and attempt to update
735 * it to reflect a new dirty region on a given page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 *
Trond Myklebuste7d39062008-06-13 12:12:32 -0400737 * If the attempt fails, then the existing request is flushed out
738 * to disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 */
Trond Myklebuste7d39062008-06-13 12:12:32 -0400740static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
741 struct page *page,
742 unsigned int offset,
743 unsigned int bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744{
Trond Myklebuste7d39062008-06-13 12:12:32 -0400745 struct nfs_page *req;
746 unsigned int rqend;
747 unsigned int end;
748 int error;
749
750 if (!PagePrivate(page))
751 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
753 end = offset + bytes;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400754 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 for (;;) {
Mel Gorman29418aa2012-07-31 16:45:10 -0700757 req = nfs_page_find_request_locked(NFS_I(inode), page);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400758 if (req == NULL)
759 goto out_unlock;
Trond Myklebust277459d2006-12-05 00:35:35 -0500760
Trond Myklebuste7d39062008-06-13 12:12:32 -0400761 rqend = req->wb_offset + req->wb_bytes;
762 /*
763 * Tell the caller to flush out the request if
764 * the offsets are non-contiguous.
765 * Note: nfs_flush_incompatible() will already
766 * have flushed out requests having wrong owners.
767 */
Trond Myklebuste468bae2008-06-13 13:25:22 -0400768 if (offset > rqend
Trond Myklebuste7d39062008-06-13 12:12:32 -0400769 || end < req->wb_offset)
770 goto out_flushme;
771
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400772 if (nfs_lock_request(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
Trond Myklebuste7d39062008-06-13 12:12:32 -0400775 /* The request is locked, so wait and then retry */
Trond Myklebust587142f2007-07-02 09:57:54 -0400776 spin_unlock(&inode->i_lock);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400777 error = nfs_wait_on_request(req);
778 nfs_release_request(req);
779 if (error != 0)
780 goto out_err;
781 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 }
783
784 /* Okay, the request matches. Update the region */
785 if (offset < req->wb_offset) {
786 req->wb_offset = offset;
787 req->wb_pgbase = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 if (end > rqend)
790 req->wb_bytes = end - req->wb_offset;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400791 else
792 req->wb_bytes = rqend - req->wb_offset;
793out_unlock:
794 spin_unlock(&inode->i_lock);
Fred Isamanca138f32012-04-05 15:26:36 -0400795 if (req)
796 nfs_clear_request_commit(req);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400797 return req;
798out_flushme:
799 spin_unlock(&inode->i_lock);
800 nfs_release_request(req);
801 error = nfs_wb_page(inode, page);
802out_err:
803 return ERR_PTR(error);
804}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Trond Myklebuste7d39062008-06-13 12:12:32 -0400806/*
807 * Try to update an existing write request, or create one if there is none.
808 *
809 * Note: Should always be called with the Page Lock held to prevent races
810 * if we have to add a new request. Also assumes that the caller has
811 * already called nfs_flush_incompatible() if necessary.
812 */
813static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
814 struct page *page, unsigned int offset, unsigned int bytes)
815{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700816 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400817 struct nfs_page *req;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400818
819 req = nfs_try_to_update_request(inode, page, offset, bytes);
820 if (req != NULL)
821 goto out;
822 req = nfs_create_request(ctx, inode, page, offset, bytes);
823 if (IS_ERR(req))
824 goto out;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500825 nfs_inode_add_request(inode, req);
Trond Myklebustefc91ed2008-06-10 18:31:00 -0400826out:
Trond Myklebust61e930a2007-10-18 17:08:05 -0400827 return req;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828}
829
Trond Myklebuste7d39062008-06-13 12:12:32 -0400830static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
831 unsigned int offset, unsigned int count)
832{
833 struct nfs_page *req;
834
835 req = nfs_setup_write_request(ctx, page, offset, count);
836 if (IS_ERR(req))
837 return PTR_ERR(req);
838 /* Update file length */
839 nfs_grow_file(page, offset, count);
840 nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
Trond Myklebusta6305dd2010-04-09 19:07:08 -0400841 nfs_mark_request_dirty(req);
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400842 nfs_unlock_and_release_request(req);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400843 return 0;
844}
845
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846int nfs_flush_incompatible(struct file *file, struct page *page)
847{
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400848 struct nfs_open_context *ctx = nfs_file_open_context(file);
Trond Myklebust2a369152012-08-13 18:54:45 -0400849 struct nfs_lock_context *l_ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 struct nfs_page *req;
Trond Myklebust1a545332006-12-05 00:35:40 -0500851 int do_flush, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 /*
853 * Look for a request corresponding to this page. If there
854 * is one, and it belongs to another file, we flush it out
855 * before we try to copy anything into the page. Do this
856 * due to the lack of an ACCESS-type call in NFSv2.
857 * Also do the same if we find a request from an existing
858 * dropped page.
859 */
Trond Myklebust1a545332006-12-05 00:35:40 -0500860 do {
861 req = nfs_page_find_request(page);
862 if (req == NULL)
863 return 0;
Trond Myklebust2a369152012-08-13 18:54:45 -0400864 l_ctx = req->wb_lock_context;
865 do_flush = req->wb_page != page || req->wb_context != ctx;
Trond Myklebust0f1d2602013-09-05 15:52:51 -0400866 if (l_ctx && ctx->dentry->d_inode->i_flock != NULL) {
Trond Myklebust2a369152012-08-13 18:54:45 -0400867 do_flush |= l_ctx->lockowner.l_owner != current->files
868 || l_ctx->lockowner.l_pid != current->tgid;
869 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 nfs_release_request(req);
Trond Myklebust1a545332006-12-05 00:35:40 -0500871 if (!do_flush)
872 return 0;
Mel Gormand56b4dd2012-07-31 16:45:06 -0700873 status = nfs_wb_page(page_file_mapping(page)->host, page);
Trond Myklebust1a545332006-12-05 00:35:40 -0500874 } while (status == 0);
875 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876}
877
878/*
Andy Adamsondc248262013-08-14 11:59:16 -0400879 * Avoid buffered writes when a open context credential's key would
880 * expire soon.
881 *
882 * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL.
883 *
884 * Return 0 and set a credential flag which triggers the inode to flush
885 * and performs NFS_FILE_SYNC writes if the key will expired within
886 * RPC_KEY_EXPIRE_TIMEO.
887 */
888int
889nfs_key_timeout_notify(struct file *filp, struct inode *inode)
890{
891 struct nfs_open_context *ctx = nfs_file_open_context(filp);
892 struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth;
893
894 return rpcauth_key_timeout_notify(auth, ctx->cred);
895}
896
897/*
898 * Test if the open context credential key is marked to expire soon.
899 */
900bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx)
901{
902 return rpcauth_cred_key_to_expire(ctx->cred);
903}
904
905/*
Trond Myklebust5d47a352008-02-07 17:24:07 -0500906 * If the page cache is marked as unsafe or invalid, then we can't rely on
907 * the PageUptodate() flag. In this case, we will need to turn off
908 * write optimisations that depend on the page contents being correct.
909 */
Trond Myklebust8d197a52012-04-29 12:50:01 -0400910static bool nfs_write_pageuptodate(struct page *page, struct inode *inode)
Trond Myklebust5d47a352008-02-07 17:24:07 -0500911{
Trond Myklebust8d197a52012-04-29 12:50:01 -0400912 if (nfs_have_delegated_attributes(inode))
913 goto out;
Jeff Layton81d9bce2012-12-10 09:25:48 -0500914 if (NFS_I(inode)->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE))
Trond Myklebust8d197a52012-04-29 12:50:01 -0400915 return false;
916out:
917 return PageUptodate(page) != 0;
Trond Myklebust5d47a352008-02-07 17:24:07 -0500918}
919
Scott Mayhewc7559662013-07-05 17:33:19 -0400920/* If we know the page is up to date, and we're not using byte range locks (or
921 * if we have the whole file locked for writing), it may be more efficient to
922 * extend the write to cover the entire page in order to avoid fragmentation
923 * inefficiencies.
924 *
925 * If the file is opened for synchronous writes or if we have a write delegation
926 * from the server then we can just skip the rest of the checks.
927 */
928static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode)
929{
930 if (file->f_flags & O_DSYNC)
931 return 0;
932 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
933 return 1;
934 if (nfs_write_pageuptodate(page, inode) && (inode->i_flock == NULL ||
935 (inode->i_flock->fl_start == 0 &&
936 inode->i_flock->fl_end == OFFSET_MAX &&
937 inode->i_flock->fl_type != F_RDLCK)))
938 return 1;
939 return 0;
940}
941
Trond Myklebust5d47a352008-02-07 17:24:07 -0500942/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 * Update and possibly write a cached page of an NFS file.
944 *
945 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
946 * things with a page scheduled for an RPC call (e.g. invalidate it).
947 */
948int nfs_updatepage(struct file *file, struct page *page,
949 unsigned int offset, unsigned int count)
950{
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400951 struct nfs_open_context *ctx = nfs_file_open_context(file);
Mel Gormand56b4dd2012-07-31 16:45:06 -0700952 struct inode *inode = page_file_mapping(page)->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 int status = 0;
954
Chuck Lever91d5b472006-03-20 13:44:14 -0500955 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
956
Chuck Lever48186c72008-06-11 17:56:05 -0400957 dprintk("NFS: nfs_updatepage(%s/%s %d@%lld)\n",
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800958 file->f_path.dentry->d_parent->d_name.name,
959 file->f_path.dentry->d_name.name, count,
Mel Gormand56b4dd2012-07-31 16:45:06 -0700960 (long long)(page_file_offset(page) + offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961
Scott Mayhewc7559662013-07-05 17:33:19 -0400962 if (nfs_can_extend_write(file, page, inode)) {
Trond Myklebust49a70f22006-12-05 00:35:38 -0500963 count = max(count + offset, nfs_page_length(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 }
966
Trond Myklebuste21195a2006-12-05 00:35:39 -0500967 status = nfs_writepage_setup(ctx, page, offset, count);
Trond Myklebust03fa9e82008-06-05 16:02:35 -0400968 if (status < 0)
969 nfs_set_pageerror(page);
Trond Myklebust59b7c052011-10-17 18:22:55 -0700970 else
971 __set_page_dirty_nobuffers(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972
Chuck Lever48186c72008-06-11 17:56:05 -0400973 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 status, (long long)i_size_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 return status;
976}
977
Trond Myklebust3ff75762007-07-14 15:40:00 -0400978static int flush_task_priority(int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979{
980 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
981 case FLUSH_HIGHPRI:
982 return RPC_PRIORITY_HIGH;
983 case FLUSH_LOWPRI:
984 return RPC_PRIORITY_LOW;
985 }
986 return RPC_PRIORITY_NORMAL;
987}
988
Fred Isamanc5996c42012-04-20 14:47:41 -0400989int nfs_initiate_write(struct rpc_clnt *clnt,
990 struct nfs_write_data *data,
Andy Adamsond138d5d2011-03-03 15:13:41 +0000991 const struct rpc_call_ops *call_ops,
Andy Adamson9f0ec1762012-04-27 17:53:44 -0400992 int how, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993{
Fred Isamancd841602012-04-20 14:47:44 -0400994 struct inode *inode = data->header->inode;
Trond Myklebust3ff75762007-07-14 15:40:00 -0400995 int priority = flush_task_priority(how);
Trond Myklebust07737692007-10-25 18:42:54 -0400996 struct rpc_task *task;
Trond Myklebustbdc7f022007-07-14 15:40:00 -0400997 struct rpc_message msg = {
998 .rpc_argp = &data->args,
999 .rpc_resp = &data->res,
Fred Isamancd841602012-04-20 14:47:44 -04001000 .rpc_cred = data->header->cred,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001001 };
Trond Myklebust84115e12007-07-14 15:39:59 -04001002 struct rpc_task_setup task_setup_data = {
Andy Adamsond138d5d2011-03-03 15:13:41 +00001003 .rpc_client = clnt,
Trond Myklebust07737692007-10-25 18:42:54 -04001004 .task = &data->task,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001005 .rpc_message = &msg,
Trond Myklebust84115e12007-07-14 15:39:59 -04001006 .callback_ops = call_ops,
1007 .callback_data = data,
Trond Myklebust101070c2008-02-19 20:04:23 -05001008 .workqueue = nfsiod_workqueue,
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001009 .flags = RPC_TASK_ASYNC | flags,
Trond Myklebust3ff75762007-07-14 15:40:00 -04001010 .priority = priority,
Trond Myklebust84115e12007-07-14 15:39:59 -04001011 };
Trond Myklebust2c61be02010-04-09 19:54:50 -04001012 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013
Andy Adamsond138d5d2011-03-03 15:13:41 +00001014 /* Set up the initial task struct. */
1015 NFS_PROTO(inode)->write_setup(data, &msg);
1016
1017 dprintk("NFS: %5u initiated write call "
1018 "(req %s/%lld, %u bytes @ offset %llu)\n",
1019 data->task.tk_pid,
1020 inode->i_sb->s_id,
1021 (long long)NFS_FILEID(inode),
1022 data->args.count,
1023 (unsigned long long)data->args.offset);
1024
Weston Andros Adamson8c21c622013-08-13 16:37:37 -04001025 nfs4_state_protect_write(NFS_SERVER(inode)->nfs_client,
1026 &task_setup_data.rpc_client, &msg, data);
1027
Andy Adamsond138d5d2011-03-03 15:13:41 +00001028 task = rpc_run_task(&task_setup_data);
1029 if (IS_ERR(task)) {
1030 ret = PTR_ERR(task);
1031 goto out;
1032 }
1033 if (how & FLUSH_SYNC) {
1034 ret = rpc_wait_for_completion_task(task);
1035 if (ret == 0)
1036 ret = task->tk_status;
1037 }
1038 rpc_put_task(task);
1039out:
1040 return ret;
1041}
Fred Isamana69aef12011-03-03 15:13:47 +00001042EXPORT_SYMBOL_GPL(nfs_initiate_write);
Andy Adamsond138d5d2011-03-03 15:13:41 +00001043
1044/*
1045 * Set up the argument/result storage required for the RPC call.
1046 */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001047static void nfs_write_rpcsetup(struct nfs_write_data *data,
Andy Adamsond138d5d2011-03-03 15:13:41 +00001048 unsigned int count, unsigned int offset,
Fred Isamanea2cf222012-04-20 14:47:53 -04001049 int how, struct nfs_commit_info *cinfo)
Andy Adamsond138d5d2011-03-03 15:13:41 +00001050{
Fred Isaman6c75dc02012-04-20 14:47:47 -04001051 struct nfs_page *req = data->header->req;
Andy Adamsond138d5d2011-03-03 15:13:41 +00001052
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 /* Set up the RPC argument and reply structs
1054 * NB: take care not to mess about with data->commit et al. */
1055
Fred Isaman6c75dc02012-04-20 14:47:47 -04001056 data->args.fh = NFS_FH(data->header->inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 data->args.offset = req_offset(req) + offset;
Boaz Harrosh2bea0382011-06-16 11:35:46 -04001058 /* pnfs_set_layoutcommit needs this */
1059 data->mds_offset = data->args.offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060 data->args.pgbase = req->wb_pgbase + offset;
Fred Isaman30dd3742012-04-20 14:47:45 -04001061 data->args.pages = data->pages.pagevec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 data->args.count = count;
Trond Myklebust383ba712008-02-19 20:04:20 -05001063 data->args.context = get_nfs_open_context(req->wb_context);
Trond Myklebustf11ac8d2010-06-25 16:35:53 -04001064 data->args.lock_context = req->wb_lock_context;
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001065 data->args.stable = NFS_UNSTABLE;
Trond Myklebust87ed5eb2011-07-12 13:42:01 -04001066 switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
1067 case 0:
1068 break;
1069 case FLUSH_COND_STABLE:
Fred Isamanea2cf222012-04-20 14:47:53 -04001070 if (nfs_reqs_to_commit(cinfo))
Trond Myklebust87ed5eb2011-07-12 13:42:01 -04001071 break;
1072 default:
1073 data->args.stable = NFS_FILE_SYNC;
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001074 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075
1076 data->res.fattr = &data->fattr;
1077 data->res.count = count;
1078 data->res.verf = &data->verf;
Trond Myklebust0e574af2005-10-27 22:12:38 -04001079 nfs_fattr_init(&data->fattr);
Trond Myklebust6e4efd52011-07-12 13:42:02 -04001080}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
Trond Myklebust6e4efd52011-07-12 13:42:02 -04001082static int nfs_do_write(struct nfs_write_data *data,
1083 const struct rpc_call_ops *call_ops,
Trond Myklebust6e4efd52011-07-12 13:42:02 -04001084 int how)
1085{
Fred Isamancd841602012-04-20 14:47:44 -04001086 struct inode *inode = data->header->inode;
Andy Adamson0382b742011-03-03 15:13:45 +00001087
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001088 return nfs_initiate_write(NFS_CLIENT(inode), data, call_ops, how, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089}
1090
Trond Myklebust275acaa2011-07-12 13:42:02 -04001091static int nfs_do_multiple_writes(struct list_head *head,
1092 const struct rpc_call_ops *call_ops,
Trond Myklebust275acaa2011-07-12 13:42:02 -04001093 int how)
1094{
1095 struct nfs_write_data *data;
1096 int ret = 0;
1097
1098 while (!list_empty(head)) {
1099 int ret2;
1100
Fred Isaman6c75dc02012-04-20 14:47:47 -04001101 data = list_first_entry(head, struct nfs_write_data, list);
Trond Myklebust275acaa2011-07-12 13:42:02 -04001102 list_del_init(&data->list);
1103
Trond Myklebustdce81292011-07-13 15:59:19 -04001104 ret2 = nfs_do_write(data, call_ops, how);
Trond Myklebust275acaa2011-07-12 13:42:02 -04001105 if (ret == 0)
1106 ret = ret2;
1107 }
1108 return ret;
1109}
1110
Fred6d884e82008-03-19 11:24:38 -04001111/* If a nfs_flush_* function fails, it should remove reqs from @head and
1112 * call this on each, which will prepare them to be retried on next
1113 * writeback using standard nfs.
1114 */
1115static void nfs_redirty_request(struct nfs_page *req)
1116{
1117 nfs_mark_request_dirty(req);
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001118 nfs_unlock_request(req);
Trond Myklebustd1182b32012-05-09 13:37:43 -04001119 nfs_end_page_writeback(req->wb_page);
Trond Myklebust3aff4eb2012-05-09 14:30:35 -04001120 nfs_release_request(req);
Fred6d884e82008-03-19 11:24:38 -04001121}
1122
Fred Isaman061ae2e2012-04-20 14:47:48 -04001123static void nfs_async_write_error(struct list_head *head)
Fred Isaman6c75dc02012-04-20 14:47:47 -04001124{
1125 struct nfs_page *req;
1126
1127 while (!list_empty(head)) {
1128 req = nfs_list_entry(head->next);
1129 nfs_list_remove_request(req);
1130 nfs_redirty_request(req);
1131 }
1132}
1133
Fred Isaman061ae2e2012-04-20 14:47:48 -04001134static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
1135 .error_cleanup = nfs_async_write_error,
1136 .completion = nfs_write_completion,
1137};
1138
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001139static void nfs_flush_error(struct nfs_pageio_descriptor *desc,
1140 struct nfs_pgio_header *hdr)
1141{
1142 set_bit(NFS_IOHDR_REDO, &hdr->flags);
1143 while (!list_empty(&hdr->rpc_list)) {
1144 struct nfs_write_data *data = list_first_entry(&hdr->rpc_list,
1145 struct nfs_write_data, list);
1146 list_del(&data->list);
1147 nfs_writedata_release(data);
1148 }
1149 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
1150}
1151
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152/*
1153 * Generate multiple small requests to write out a single
1154 * contiguous dirty area on one page.
1155 */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001156static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
1157 struct nfs_pgio_header *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158{
Fred Isaman6c75dc02012-04-20 14:47:47 -04001159 struct nfs_page *req = hdr->req;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001160 struct page *page = req->wb_page;
1161 struct nfs_write_data *data;
Trond Myklebustd0979712011-07-12 13:42:02 -04001162 size_t wsize = desc->pg_bsize, nbytes;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -07001163 unsigned int offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 int requests = 0;
Fred Isamanea2cf222012-04-20 14:47:53 -04001165 struct nfs_commit_info cinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
Fred Isamanea2cf222012-04-20 14:47:53 -04001167 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168
Trond Myklebustb31268a2011-03-21 17:02:00 -04001169 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
Fred Isamanea2cf222012-04-20 14:47:53 -04001170 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo) ||
Trond Myklebustb31268a2011-03-21 17:02:00 -04001171 desc->pg_count > wsize))
1172 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1173
1174
Trond Myklebust275acaa2011-07-12 13:42:02 -04001175 offset = 0;
Fred Isamanc76069b2011-03-03 15:13:48 +00001176 nbytes = desc->pg_count;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -07001177 do {
1178 size_t len = min(nbytes, wsize);
1179
Fred Isaman6c75dc02012-04-20 14:47:47 -04001180 data = nfs_writedata_alloc(hdr, 1);
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001181 if (!data) {
1182 nfs_flush_error(desc, hdr);
1183 return -ENOMEM;
1184 }
Fred Isaman30dd3742012-04-20 14:47:45 -04001185 data->pages.pagevec[0] = page;
Fred Isamanea2cf222012-04-20 14:47:53 -04001186 nfs_write_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001187 list_add(&data->list, &hdr->rpc_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 requests++;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -07001189 nbytes -= len;
Trond Myklebust275acaa2011-07-12 13:42:02 -04001190 offset += len;
Trond Myklebuste9f7bee2006-09-08 09:48:54 -07001191 } while (nbytes != 0);
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001192 nfs_list_remove_request(req);
1193 nfs_list_add_request(req, &hdr->pages);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001194 desc->pg_rpc_callops = &nfs_write_common_ops;
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001195 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196}
1197
1198/*
1199 * Create an RPC task for the given write request and kick it.
1200 * The page must have been locked by the caller.
1201 *
1202 * It may happen that the page we're passed is not marked dirty.
1203 * This is the case if nfs_updatepage detects a conflicting request
1204 * that has been written but not committed.
1205 */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001206static int nfs_flush_one(struct nfs_pageio_descriptor *desc,
1207 struct nfs_pgio_header *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208{
1209 struct nfs_page *req;
1210 struct page **pages;
1211 struct nfs_write_data *data;
Fred Isamanc76069b2011-03-03 15:13:48 +00001212 struct list_head *head = &desc->pg_list;
Fred Isamanea2cf222012-04-20 14:47:53 -04001213 struct nfs_commit_info cinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
Fred Isaman6c75dc02012-04-20 14:47:47 -04001215 data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base,
1216 desc->pg_count));
1217 if (!data) {
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001218 nfs_flush_error(desc, hdr);
1219 return -ENOMEM;
Fred Isaman44b83792011-03-03 15:13:44 +00001220 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001221
Fred Isamanea2cf222012-04-20 14:47:53 -04001222 nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
Fred Isaman30dd3742012-04-20 14:47:45 -04001223 pages = data->pages.pagevec;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 while (!list_empty(head)) {
1225 req = nfs_list_entry(head->next);
1226 nfs_list_remove_request(req);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001227 nfs_list_add_request(req, &hdr->pages);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 *pages++ = req->wb_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
Trond Myklebustb31268a2011-03-21 17:02:00 -04001231 if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
Fred Isamanea2cf222012-04-20 14:47:53 -04001232 (desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
Trond Myklebustb31268a2011-03-21 17:02:00 -04001233 desc->pg_ioflags &= ~FLUSH_COND_STABLE;
1234
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 /* Set up the argument struct */
Fred Isamanea2cf222012-04-20 14:47:53 -04001236 nfs_write_rpcsetup(data, desc->pg_count, 0, desc->pg_ioflags, &cinfo);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001237 list_add(&data->list, &hdr->rpc_list);
1238 desc->pg_rpc_callops = &nfs_write_common_ops;
Trond Myklebust25b11dc2012-05-01 12:07:22 -04001239 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240}
1241
Fred Isaman6c75dc02012-04-20 14:47:47 -04001242int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
1243 struct nfs_pgio_header *hdr)
Trond Myklebustdce81292011-07-13 15:59:19 -04001244{
1245 if (desc->pg_bsize < PAGE_CACHE_SIZE)
Fred Isaman6c75dc02012-04-20 14:47:47 -04001246 return nfs_flush_multi(desc, hdr);
1247 return nfs_flush_one(desc, hdr);
Trond Myklebustdce81292011-07-13 15:59:19 -04001248}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001249EXPORT_SYMBOL_GPL(nfs_generic_flush);
Trond Myklebustdce81292011-07-13 15:59:19 -04001250
1251static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
Trond Myklebust1751c362011-06-10 13:30:23 -04001252{
Fred Isaman6c75dc02012-04-20 14:47:47 -04001253 struct nfs_write_header *whdr;
1254 struct nfs_pgio_header *hdr;
Trond Myklebust275acaa2011-07-12 13:42:02 -04001255 int ret;
1256
Fred Isaman6c75dc02012-04-20 14:47:47 -04001257 whdr = nfs_writehdr_alloc();
1258 if (!whdr) {
Trond Myklebust9b5415b2012-04-27 14:31:47 -04001259 desc->pg_completion_ops->error_cleanup(&desc->pg_list);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001260 return -ENOMEM;
1261 }
1262 hdr = &whdr->header;
1263 nfs_pgheader_init(desc, hdr, nfs_writehdr_free);
1264 atomic_inc(&hdr->refcnt);
1265 ret = nfs_generic_flush(desc, hdr);
Trond Myklebust50828d72011-07-12 13:42:02 -04001266 if (ret == 0)
Fred Isaman6c75dc02012-04-20 14:47:47 -04001267 ret = nfs_do_multiple_writes(&hdr->rpc_list,
1268 desc->pg_rpc_callops,
1269 desc->pg_ioflags);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001270 if (atomic_dec_and_test(&hdr->refcnt))
Fred Isaman061ae2e2012-04-20 14:47:48 -04001271 hdr->completion_ops->completion(hdr);
Trond Myklebust275acaa2011-07-12 13:42:02 -04001272 return ret;
Trond Myklebust1751c362011-06-10 13:30:23 -04001273}
Trond Myklebust1751c362011-06-10 13:30:23 -04001274
1275static const struct nfs_pageio_ops nfs_pageio_write_ops = {
1276 .pg_test = nfs_generic_pg_test,
1277 .pg_doio = nfs_generic_pg_writepages,
1278};
1279
Bryan Schumaker57208fa2012-06-20 15:53:48 -04001280void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
Fred Isaman061ae2e2012-04-20 14:47:48 -04001281 struct inode *inode, int ioflags,
1282 const struct nfs_pgio_completion_ops *compl_ops)
Trond Myklebust1751c362011-06-10 13:30:23 -04001283{
Fred Isaman061ae2e2012-04-20 14:47:48 -04001284 nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops,
Trond Myklebust1751c362011-06-10 13:30:23 -04001285 NFS_SERVER(inode)->wsize, ioflags);
1286}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001287EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
Trond Myklebust1751c362011-06-10 13:30:23 -04001288
Trond Myklebustdce81292011-07-13 15:59:19 -04001289void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
1290{
1291 pgio->pg_ops = &nfs_pageio_write_ops;
1292 pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
1293}
Trond Myklebust1f945352011-07-13 15:59:57 -04001294EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
Trond Myklebustdce81292011-07-13 15:59:19 -04001295
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
Andy Adamsondef6ed72009-04-01 09:22:26 -04001297void nfs_write_prepare(struct rpc_task *task, void *calldata)
1298{
1299 struct nfs_write_data *data = calldata;
NeilBrownef1820f2013-09-04 17:04:49 +10001300 int err;
1301 err = NFS_PROTO(data->header->inode)->write_rpc_prepare(task, data);
1302 if (err)
1303 rpc_exit(task, err);
Andy Adamsondef6ed72009-04-01 09:22:26 -04001304}
Andy Adamsondef6ed72009-04-01 09:22:26 -04001305
Fred Isaman0b7c0152012-04-20 14:47:39 -04001306void nfs_commit_prepare(struct rpc_task *task, void *calldata)
1307{
1308 struct nfs_commit_data *data = calldata;
1309
1310 NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
1311}
1312
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313/*
1314 * Handle a write reply that flushes a whole page.
1315 *
1316 * FIXME: There is an inherent race with invalidate_inode_pages and
1317 * writebacks since the page->count is kept > 1 for as long
1318 * as the page has a write request pending.
1319 */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001320static void nfs_writeback_done_common(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321{
Trond Myklebust788e7a82006-03-20 13:44:27 -05001322 struct nfs_write_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001324 nfs_writeback_done(task, data);
1325}
1326
Fred Isaman6c75dc02012-04-20 14:47:47 -04001327static void nfs_writeback_release_common(void *calldata)
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001328{
1329 struct nfs_write_data *data = calldata;
Fred Isamancd841602012-04-20 14:47:44 -04001330 struct nfs_pgio_header *hdr = data->header;
Trond Myklebuste2fecb22012-01-06 08:57:46 -05001331 int status = data->task.tk_status;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001332
Fred Isaman6c75dc02012-04-20 14:47:47 -04001333 if ((status >= 0) && nfs_write_need_commit(data)) {
1334 spin_lock(&hdr->lock);
1335 if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags))
1336 ; /* Do nothing */
1337 else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags))
Trond Myklebust9bce0082012-06-05 18:32:03 -04001338 memcpy(hdr->verf, &data->verf, sizeof(*hdr->verf));
1339 else if (memcmp(hdr->verf, &data->verf, sizeof(*hdr->verf)))
Fred Isaman6c75dc02012-04-20 14:47:47 -04001340 set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags);
1341 spin_unlock(&hdr->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 }
Fred Isamancd841602012-04-20 14:47:44 -04001343 nfs_writedata_release(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344}
1345
Fred Isaman6c75dc02012-04-20 14:47:47 -04001346static const struct rpc_call_ops nfs_write_common_ops = {
Andy Adamsondef6ed72009-04-01 09:22:26 -04001347 .rpc_call_prepare = nfs_write_prepare,
Fred Isaman6c75dc02012-04-20 14:47:47 -04001348 .rpc_call_done = nfs_writeback_done_common,
1349 .rpc_release = nfs_writeback_release_common,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001350};
1351
1352
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353/*
1354 * This function is called when the WRITE call is complete.
1355 */
Fred Isaman13602892011-02-11 15:42:38 +00001356void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 struct nfs_writeargs *argp = &data->args;
1359 struct nfs_writeres *resp = &data->res;
Fred Isamancd841602012-04-20 14:47:44 -04001360 struct inode *inode = data->header->inode;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001361 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
Chuck Levera3f565b2007-01-31 12:14:01 -05001363 dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 task->tk_pid, task->tk_status);
1365
Chuck Leverf551e442006-09-20 14:33:04 -04001366 /*
1367 * ->write_done will attempt to use post-op attributes to detect
1368 * conflicting writes by other clients. A strict interpretation
1369 * of close-to-open would allow us to continue caching even if
1370 * another writer had changed the file, but some applications
1371 * depend on tighter cache coherency when writing.
1372 */
Fred Isamancd841602012-04-20 14:47:44 -04001373 status = NFS_PROTO(inode)->write_done(task, data);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001374 if (status != 0)
Fred Isaman13602892011-02-11 15:42:38 +00001375 return;
Fred Isamancd841602012-04-20 14:47:44 -04001376 nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
Chuck Lever91d5b472006-03-20 13:44:14 -05001377
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001378#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
1380 /* We tried a write call, but the server did not
1381 * commit data to stable storage even though we
1382 * requested it.
1383 * Note: There is a known bug in Tru64 < 5.0 in which
1384 * the server reports NFS_DATA_SYNC, but performs
1385 * NFS_FILE_SYNC. We therefore implement this checking
1386 * as a dprintk() in order to avoid filling syslog.
1387 */
1388 static unsigned long complain;
1389
Fred Isamana69aef12011-03-03 15:13:47 +00001390 /* Note this will print the MDS for a DS write */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 if (time_before(complain, jiffies)) {
Chuck Lever48186c72008-06-11 17:56:05 -04001392 dprintk("NFS: faulty NFS server %s:"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 " (committed = %d) != (stable = %d)\n",
Fred Isamancd841602012-04-20 14:47:44 -04001394 NFS_SERVER(inode)->nfs_client->cl_hostname,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 resp->verf->committed, argp->stable);
1396 complain = jiffies + 300 * HZ;
1397 }
1398 }
1399#endif
Fred Isaman6c75dc02012-04-20 14:47:47 -04001400 if (task->tk_status < 0)
1401 nfs_set_pgio_error(data->header, task->tk_status, argp->offset);
1402 else if (resp->count < argp->count) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 static unsigned long complain;
1404
Fred Isaman6c75dc02012-04-20 14:47:47 -04001405 /* This a short write! */
Fred Isamancd841602012-04-20 14:47:44 -04001406 nfs_inc_stats(inode, NFSIOS_SHORTWRITE);
Chuck Lever91d5b472006-03-20 13:44:14 -05001407
Linus Torvalds1da177e2005-04-16 15:20:36 -07001408 /* Has the server at least made some progress? */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001409 if (resp->count == 0) {
1410 if (time_before(complain, jiffies)) {
1411 printk(KERN_WARNING
1412 "NFS: Server wrote zero bytes, expected %u.\n",
1413 argp->count);
1414 complain = jiffies + 300 * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001416 nfs_set_pgio_error(data->header, -EIO, argp->offset);
1417 task->tk_status = -EIO;
Fred Isaman13602892011-02-11 15:42:38 +00001418 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001420 /* Was this an NFSv2 write or an NFSv3 stable write? */
1421 if (resp->verf->committed != NFS_UNSTABLE) {
1422 /* Resend from where the server left off */
1423 data->mds_offset += resp->count;
1424 argp->offset += resp->count;
1425 argp->pgbase += resp->count;
1426 argp->count -= resp->count;
1427 } else {
1428 /* Resend as a stable write in order to avoid
1429 * headaches in the case of a server crash.
1430 */
1431 argp->stable = NFS_FILE_SYNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001433 rpc_restart_call_prepare(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435}
1436
1437
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001438#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
Trond Myklebust71d0a612010-04-22 15:35:57 -04001439static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
1440{
Trond Myklebustb8413f92011-03-21 15:37:01 -04001441 int ret;
1442
Trond Myklebust71d0a612010-04-22 15:35:57 -04001443 if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags))
1444 return 1;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001445 if (!may_wait)
1446 return 0;
1447 ret = out_of_line_wait_on_bit_lock(&nfsi->flags,
1448 NFS_INO_COMMIT,
1449 nfs_wait_bit_killable,
1450 TASK_KILLABLE);
1451 return (ret < 0) ? ret : 1;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001452}
1453
Fred Isamanf453a542012-04-20 14:47:54 -04001454static void nfs_commit_clear_lock(struct nfs_inode *nfsi)
Trond Myklebust71d0a612010-04-22 15:35:57 -04001455{
1456 clear_bit(NFS_INO_COMMIT, &nfsi->flags);
1457 smp_mb__after_clear_bit();
1458 wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
1459}
1460
Fred Isaman0b7c0152012-04-20 14:47:39 -04001461void nfs_commitdata_release(struct nfs_commit_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001463 put_nfs_open_context(data->context);
1464 nfs_commit_free(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465}
Fred Isamane0c2b382011-03-23 13:27:53 +00001466EXPORT_SYMBOL_GPL(nfs_commitdata_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467
Fred Isaman0b7c0152012-04-20 14:47:39 -04001468int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001469 const struct rpc_call_ops *call_ops,
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001470 int how, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471{
Trond Myklebust07737692007-10-25 18:42:54 -04001472 struct rpc_task *task;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001473 int priority = flush_task_priority(how);
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001474 struct rpc_message msg = {
1475 .rpc_argp = &data->args,
1476 .rpc_resp = &data->res,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001477 .rpc_cred = data->cred,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001478 };
Trond Myklebust84115e12007-07-14 15:39:59 -04001479 struct rpc_task_setup task_setup_data = {
Trond Myklebust07737692007-10-25 18:42:54 -04001480 .task = &data->task,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001481 .rpc_client = clnt,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001482 .rpc_message = &msg,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001483 .callback_ops = call_ops,
Trond Myklebust84115e12007-07-14 15:39:59 -04001484 .callback_data = data,
Trond Myklebust101070c2008-02-19 20:04:23 -05001485 .workqueue = nfsiod_workqueue,
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001486 .flags = RPC_TASK_ASYNC | flags,
Trond Myklebust3ff75762007-07-14 15:40:00 -04001487 .priority = priority,
Trond Myklebust84115e12007-07-14 15:39:59 -04001488 };
Trond Myklebust788e7a82006-03-20 13:44:27 -05001489 /* Set up the initial task struct. */
Fred Isaman9ace33c2011-03-23 13:27:45 +00001490 NFS_PROTO(data->inode)->commit_setup(data, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491
Chuck Levera3f565b2007-01-31 12:14:01 -05001492 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001493
Weston Andros Adamson8c21c622013-08-13 16:37:37 -04001494 nfs4_state_protect(NFS_SERVER(data->inode)->nfs_client,
1495 NFS_SP4_MACH_CRED_COMMIT, &task_setup_data.rpc_client, &msg);
1496
Trond Myklebust07737692007-10-25 18:42:54 -04001497 task = rpc_run_task(&task_setup_data);
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001498 if (IS_ERR(task))
1499 return PTR_ERR(task);
Jeff Laytond2224e72011-03-06 17:14:13 +00001500 if (how & FLUSH_SYNC)
1501 rpc_wait_for_completion_task(task);
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001502 rpc_put_task(task);
1503 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504}
Fred Isamane0c2b382011-03-23 13:27:53 +00001505EXPORT_SYMBOL_GPL(nfs_initiate_commit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506
1507/*
Fred Isaman9ace33c2011-03-23 13:27:45 +00001508 * Set up the argument/result storage required for the RPC call.
1509 */
Fred Isaman0b7c0152012-04-20 14:47:39 -04001510void nfs_init_commit(struct nfs_commit_data *data,
Fred Isamanf453a542012-04-20 14:47:54 -04001511 struct list_head *head,
1512 struct pnfs_layout_segment *lseg,
1513 struct nfs_commit_info *cinfo)
Fred Isaman9ace33c2011-03-23 13:27:45 +00001514{
1515 struct nfs_page *first = nfs_list_entry(head->next);
Al Viro3d4ff432011-06-22 18:40:12 -04001516 struct inode *inode = first->wb_context->dentry->d_inode;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001517
1518 /* Set up the RPC argument and reply structs
1519 * NB: take care not to mess about with data->commit et al. */
1520
1521 list_splice_init(head, &data->pages);
1522
1523 data->inode = inode;
1524 data->cred = first->wb_context->cred;
Fred Isaman988b6dc2011-03-23 13:27:52 +00001525 data->lseg = lseg; /* reference transferred */
Fred Isaman9ace33c2011-03-23 13:27:45 +00001526 data->mds_ops = &nfs_commit_ops;
Fred Isamanf453a542012-04-20 14:47:54 -04001527 data->completion_ops = cinfo->completion_ops;
Fred Isamanb359f9d2012-04-20 14:47:55 -04001528 data->dreq = cinfo->dreq;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001529
1530 data->args.fh = NFS_FH(data->inode);
1531 /* Note: we always request a commit of the entire inode */
1532 data->args.offset = 0;
1533 data->args.count = 0;
Fred Isaman0b7c0152012-04-20 14:47:39 -04001534 data->context = get_nfs_open_context(first->wb_context);
Fred Isaman9ace33c2011-03-23 13:27:45 +00001535 data->res.fattr = &data->fattr;
1536 data->res.verf = &data->verf;
1537 nfs_fattr_init(&data->fattr);
1538}
Fred Isamane0c2b382011-03-23 13:27:53 +00001539EXPORT_SYMBOL_GPL(nfs_init_commit);
Fred Isaman9ace33c2011-03-23 13:27:45 +00001540
Fred Isamane0c2b382011-03-23 13:27:53 +00001541void nfs_retry_commit(struct list_head *page_list,
Fred Isamanea2cf222012-04-20 14:47:53 -04001542 struct pnfs_layout_segment *lseg,
1543 struct nfs_commit_info *cinfo)
Fred Isaman64bfeb42011-03-23 13:27:47 +00001544{
1545 struct nfs_page *req;
1546
1547 while (!list_empty(page_list)) {
1548 req = nfs_list_entry(page_list->next);
1549 nfs_list_remove_request(req);
Fred Isamanea2cf222012-04-20 14:47:53 -04001550 nfs_mark_request_commit(req, lseg, cinfo);
Fred Isaman56f9cd62012-04-20 14:47:56 -04001551 if (!cinfo->dreq) {
1552 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Mel Gormand56b4dd2012-07-31 16:45:06 -07001553 dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
Fred Isaman56f9cd62012-04-20 14:47:56 -04001554 BDI_RECLAIMABLE);
1555 }
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001556 nfs_unlock_and_release_request(req);
Fred Isaman64bfeb42011-03-23 13:27:47 +00001557 }
1558}
Fred Isamane0c2b382011-03-23 13:27:53 +00001559EXPORT_SYMBOL_GPL(nfs_retry_commit);
Fred Isaman64bfeb42011-03-23 13:27:47 +00001560
Fred Isaman9ace33c2011-03-23 13:27:45 +00001561/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562 * Commit dirty pages
1563 */
1564static int
Fred Isamanea2cf222012-04-20 14:47:53 -04001565nfs_commit_list(struct inode *inode, struct list_head *head, int how,
1566 struct nfs_commit_info *cinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001568 struct nfs_commit_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001570 data = nfs_commitdata_alloc();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571
1572 if (!data)
1573 goto out_bad;
1574
1575 /* Set up the argument struct */
Fred Isamanf453a542012-04-20 14:47:54 -04001576 nfs_init_commit(data, head, NULL, cinfo);
1577 atomic_inc(&cinfo->mds->rpcs_out);
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001578 return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops,
1579 how, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 out_bad:
Fred Isamanea2cf222012-04-20 14:47:53 -04001581 nfs_retry_commit(head, NULL, cinfo);
Fred Isamanf453a542012-04-20 14:47:54 -04001582 cinfo->completion_ops->error_cleanup(NFS_I(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583 return -ENOMEM;
1584}
1585
1586/*
1587 * COMMIT call returned
1588 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001589static void nfs_commit_done(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001591 struct nfs_commit_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592
Chuck Levera3f565b2007-01-31 12:14:01 -05001593 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594 task->tk_pid, task->tk_status);
1595
Trond Myklebust788e7a82006-03-20 13:44:27 -05001596 /* Call the NFS version-specific code */
Trond Myklebustc0d0e962011-04-12 12:29:15 -04001597 NFS_PROTO(data->inode)->commit_done(task, data);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001598}
1599
Fred Isamanf453a542012-04-20 14:47:54 -04001600static void nfs_commit_release_pages(struct nfs_commit_data *data)
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001601{
Fred Isaman5917ce82011-03-23 13:27:48 +00001602 struct nfs_page *req;
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001603 int status = data->task.tk_status;
Fred Isamanf453a542012-04-20 14:47:54 -04001604 struct nfs_commit_info cinfo;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001605
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606 while (!list_empty(&data->pages)) {
1607 req = nfs_list_entry(data->pages.next);
1608 nfs_list_remove_request(req);
Fred Isamand6d6dc72012-03-08 17:29:35 -05001609 nfs_clear_page_commit(req->wb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610
Chuck Lever48186c72008-06-11 17:56:05 -04001611 dprintk("NFS: commit (%s/%lld %d@%lld)",
Al Viro3d4ff432011-06-22 18:40:12 -04001612 req->wb_context->dentry->d_sb->s_id,
1613 (long long)NFS_FILEID(req->wb_context->dentry->d_inode),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 req->wb_bytes,
1615 (long long)req_offset(req));
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001616 if (status < 0) {
1617 nfs_context_set_write_error(req->wb_context, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 nfs_inode_remove_request(req);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001619 dprintk(", error = %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001620 goto next;
1621 }
1622
1623 /* Okay, COMMIT succeeded, apparently. Check the verifier
1624 * returned by the server against all stored verfs. */
Trond Myklebust2f2c63b2012-06-08 11:56:09 -04001625 if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001626 /* We have a match */
1627 nfs_inode_remove_request(req);
1628 dprintk(" OK\n");
1629 goto next;
1630 }
1631 /* We have a mismatch. Write the page again */
1632 dprintk(" mismatch\n");
Fred6d884e82008-03-19 11:24:38 -04001633 nfs_mark_request_dirty(req);
Trond Myklebust05990d12012-09-11 16:01:22 -04001634 set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635 next:
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001636 nfs_unlock_and_release_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637 }
Fred Isamanf453a542012-04-20 14:47:54 -04001638 nfs_init_cinfo(&cinfo, data->inode, data->dreq);
1639 if (atomic_dec_and_test(&cinfo.mds->rpcs_out))
1640 nfs_commit_clear_lock(NFS_I(data->inode));
Fred Isaman5917ce82011-03-23 13:27:48 +00001641}
1642
1643static void nfs_commit_release(void *calldata)
1644{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001645 struct nfs_commit_data *data = calldata;
Fred Isaman5917ce82011-03-23 13:27:48 +00001646
Fred Isamanf453a542012-04-20 14:47:54 -04001647 data->completion_ops->completion(data);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001648 nfs_commitdata_release(calldata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001649}
Trond Myklebust788e7a82006-03-20 13:44:27 -05001650
1651static const struct rpc_call_ops nfs_commit_ops = {
Fred Isaman0b7c0152012-04-20 14:47:39 -04001652 .rpc_call_prepare = nfs_commit_prepare,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001653 .rpc_call_done = nfs_commit_done,
1654 .rpc_release = nfs_commit_release,
1655};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656
Fred Isamanf453a542012-04-20 14:47:54 -04001657static const struct nfs_commit_completion_ops nfs_commit_completion_ops = {
1658 .completion = nfs_commit_release_pages,
1659 .error_cleanup = nfs_commit_clear_lock,
1660};
1661
Fred Isaman1763da12012-04-20 14:47:57 -04001662int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
1663 int how, struct nfs_commit_info *cinfo)
Fred Isaman84c53ab2012-04-20 14:47:52 -04001664{
1665 int status;
1666
Fred Isamanea2cf222012-04-20 14:47:53 -04001667 status = pnfs_commit_list(inode, head, how, cinfo);
Fred Isaman84c53ab2012-04-20 14:47:52 -04001668 if (status == PNFS_NOT_ATTEMPTED)
Fred Isamanea2cf222012-04-20 14:47:53 -04001669 status = nfs_commit_list(inode, head, how, cinfo);
Fred Isaman84c53ab2012-04-20 14:47:52 -04001670 return status;
1671}
1672
Trond Myklebustb608b282010-07-30 15:31:54 -04001673int nfs_commit_inode(struct inode *inode, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001675 LIST_HEAD(head);
Fred Isamanea2cf222012-04-20 14:47:53 -04001676 struct nfs_commit_info cinfo;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001677 int may_wait = how & FLUSH_SYNC;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001678 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679
Trond Myklebustb8413f92011-03-21 15:37:01 -04001680 res = nfs_commit_set_lock(NFS_I(inode), may_wait);
1681 if (res <= 0)
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001682 goto out_mark_dirty;
Fred Isamanea2cf222012-04-20 14:47:53 -04001683 nfs_init_cinfo_from_inode(&cinfo, inode);
1684 res = nfs_scan_commit(inode, &head, &cinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 if (res) {
Fred Isamana861a1e2011-03-23 13:27:51 +00001686 int error;
1687
Fred Isamanea2cf222012-04-20 14:47:53 -04001688 error = nfs_generic_commit_list(inode, &head, how, &cinfo);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001689 if (error < 0)
1690 return error;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001691 if (!may_wait)
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001692 goto out_mark_dirty;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001693 error = wait_on_bit(&NFS_I(inode)->flags,
1694 NFS_INO_COMMIT,
1695 nfs_wait_bit_killable,
1696 TASK_KILLABLE);
1697 if (error < 0)
1698 return error;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001699 } else
1700 nfs_commit_clear_lock(NFS_I(inode));
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001701 return res;
1702 /* Note: If we exit without ensuring that the commit is complete,
1703 * we must mark the inode as dirty. Otherwise, future calls to
1704 * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
1705 * that the data is on the disk.
1706 */
1707out_mark_dirty:
1708 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 return res;
1710}
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001711
1712static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1713{
Trond Myklebust420e3642010-02-19 17:00:02 -08001714 struct nfs_inode *nfsi = NFS_I(inode);
1715 int flags = FLUSH_SYNC;
1716 int ret = 0;
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001717
Jeff Layton3236c3e2011-10-11 09:49:21 -04001718 /* no commits means nothing needs to be done */
Fred Isamanea2cf222012-04-20 14:47:53 -04001719 if (!nfsi->commit_info.ncommit)
Jeff Layton3236c3e2011-10-11 09:49:21 -04001720 return ret;
1721
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001722 if (wbc->sync_mode == WB_SYNC_NONE) {
1723 /* Don't commit yet if this is a non-blocking flush and there
1724 * are a lot of outstanding writes for this mapping.
1725 */
Fred Isamanea2cf222012-04-20 14:47:53 -04001726 if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1))
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001727 goto out_mark_dirty;
Trond Myklebust420e3642010-02-19 17:00:02 -08001728
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001729 /* don't wait for the COMMIT response */
Trond Myklebust420e3642010-02-19 17:00:02 -08001730 flags = 0;
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001731 }
1732
Trond Myklebust420e3642010-02-19 17:00:02 -08001733 ret = nfs_commit_inode(inode, flags);
1734 if (ret >= 0) {
1735 if (wbc->sync_mode == WB_SYNC_NONE) {
1736 if (ret < wbc->nr_to_write)
1737 wbc->nr_to_write -= ret;
1738 else
1739 wbc->nr_to_write = 0;
1740 }
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001741 return 0;
Trond Myklebust420e3642010-02-19 17:00:02 -08001742 }
1743out_mark_dirty:
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001744 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1745 return ret;
1746}
Trond Myklebustc63c7b02007-04-02 19:29:52 -04001747#else
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001748static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1749{
1750 return 0;
1751}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752#endif
1753
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001754int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1755{
Bryan Schumakera8d8f022012-06-20 15:53:49 -04001756 return nfs_commit_unstable_pages(inode, wbc);
1757}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001758EXPORT_SYMBOL_GPL(nfs_write_inode);
Andy Adamson863a3c62011-03-23 13:27:54 +00001759
Trond Myklebustacdc53b2010-02-19 17:03:26 -08001760/*
1761 * flush the inode to disk.
1762 */
1763int nfs_wb_all(struct inode *inode)
Trond Myklebust34901f72007-07-25 14:09:54 -04001764{
1765 struct writeback_control wbc = {
Trond Myklebust72cb77f2009-03-11 14:10:30 -04001766 .sync_mode = WB_SYNC_ALL,
Trond Myklebust34901f72007-07-25 14:09:54 -04001767 .nr_to_write = LONG_MAX,
Trond Myklebustd7fb1202008-10-06 20:08:56 -04001768 .range_start = 0,
1769 .range_end = LLONG_MAX,
Trond Myklebust34901f72007-07-25 14:09:54 -04001770 };
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001771 int ret;
Trond Myklebust34901f72007-07-25 14:09:54 -04001772
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001773 trace_nfs_writeback_inode_enter(inode);
1774
1775 ret = sync_inode(inode, &wbc);
1776
1777 trace_nfs_writeback_inode_exit(inode, ret);
1778 return ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001779}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001780EXPORT_SYMBOL_GPL(nfs_wb_all);
Trond Myklebust1c759502006-10-09 16:18:38 -04001781
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001782int nfs_wb_page_cancel(struct inode *inode, struct page *page)
1783{
1784 struct nfs_page *req;
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001785 int ret = 0;
1786
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001787 for (;;) {
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001788 wait_on_page_writeback(page);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001789 req = nfs_page_find_request(page);
1790 if (req == NULL)
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001791 break;
Trond Myklebust7ad84aa2012-05-09 13:19:15 -04001792 if (nfs_lock_request(req)) {
Trond Myklebust8dd37752012-03-15 17:16:40 -04001793 nfs_clear_request_commit(req);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001794 nfs_inode_remove_request(req);
1795 /*
1796 * In case nfs_inode_remove_request has marked the
1797 * page as being dirty
1798 */
1799 cancel_dirty_page(page, PAGE_CACHE_SIZE);
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001800 nfs_unlock_and_release_request(req);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001801 break;
1802 }
1803 ret = nfs_wait_on_request(req);
Trond Myklebustc9edda72010-01-26 15:41:34 -05001804 nfs_release_request(req);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001805 if (ret < 0)
Trond Myklebustc9889502010-02-19 17:03:21 -08001806 break;
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001807 }
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001808 return ret;
1809}
1810
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001811/*
1812 * Write back all requests on one page - we do this before reading it.
1813 */
1814int nfs_wb_page(struct inode *inode, struct page *page)
Trond Myklebust1c759502006-10-09 16:18:38 -04001815{
Mel Gorman29418aa2012-07-31 16:45:10 -07001816 loff_t range_start = page_file_offset(page);
Trond Myklebust1c759502006-10-09 16:18:38 -04001817 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001818 struct writeback_control wbc = {
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001819 .sync_mode = WB_SYNC_ALL,
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001820 .nr_to_write = 0,
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001821 .range_start = range_start,
1822 .range_end = range_end,
1823 };
1824 int ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001825
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001826 trace_nfs_writeback_page_enter(inode);
1827
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001828 for (;;) {
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001829 wait_on_page_writeback(page);
Trond Myklebust73e33022008-04-11 16:03:54 -04001830 if (clear_page_dirty_for_io(page)) {
1831 ret = nfs_writepage_locked(page, &wbc);
1832 if (ret < 0)
1833 goto out_error;
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001834 continue;
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001835 }
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001836 ret = 0;
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001837 if (!PagePrivate(page))
1838 break;
1839 ret = nfs_commit_inode(inode, FLUSH_SYNC);
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001840 if (ret < 0)
Trond Myklebust73e33022008-04-11 16:03:54 -04001841 goto out_error;
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001842 }
Trond Myklebust73e33022008-04-11 16:03:54 -04001843out_error:
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001844 trace_nfs_writeback_page_exit(inode, ret);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001845 return ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001846}
1847
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001848#ifdef CONFIG_MIGRATION
1849int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
Mel Gormana6bc32b2012-01-12 17:19:43 -08001850 struct page *page, enum migrate_mode mode)
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001851{
Jeff Layton2da95652011-10-12 10:57:42 -04001852 /*
1853 * If PagePrivate is set, then the page is currently associated with
1854 * an in-progress read or write request. Don't try to migrate it.
1855 *
1856 * FIXME: we could do this in principle, but we'll need a way to ensure
1857 * that we can safely release the inode reference while holding
1858 * the page lock.
1859 */
1860 if (PagePrivate(page))
1861 return -EBUSY;
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001862
David Howells8c209ce2012-12-05 13:34:49 +00001863 if (!nfs_fscache_release_page(page, GFP_KERNEL))
1864 return -EBUSY;
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001865
Mel Gormana6bc32b2012-01-12 17:19:43 -08001866 return migrate_page(mapping, newpage, page, mode);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001867}
1868#endif
1869
David Howellsf7b422b2006-06-09 09:34:33 -04001870int __init nfs_init_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871{
1872 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
Fred Isamancd841602012-04-20 14:47:44 -04001873 sizeof(struct nfs_write_header),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001875 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001876 if (nfs_wdata_cachep == NULL)
1877 return -ENOMEM;
1878
Matthew Dobson93d23412006-03-26 01:37:50 -08001879 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1880 nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881 if (nfs_wdata_mempool == NULL)
Jeff Layton3dd47652012-08-02 14:30:56 -04001882 goto out_destroy_write_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883
Fred Isaman0b7c0152012-04-20 14:47:39 -04001884 nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
1885 sizeof(struct nfs_commit_data),
1886 0, SLAB_HWCACHE_ALIGN,
1887 NULL);
1888 if (nfs_cdata_cachep == NULL)
Jeff Layton3dd47652012-08-02 14:30:56 -04001889 goto out_destroy_write_mempool;
Fred Isaman0b7c0152012-04-20 14:47:39 -04001890
Matthew Dobson93d23412006-03-26 01:37:50 -08001891 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
Yanchuan Nian4c100212012-11-12 09:27:37 +08001892 nfs_cdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893 if (nfs_commit_mempool == NULL)
Jeff Layton3dd47652012-08-02 14:30:56 -04001894 goto out_destroy_commit_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001895
Peter Zijlstra89a09142007-03-16 13:38:26 -08001896 /*
1897 * NFS congestion size, scale with available memory.
1898 *
1899 * 64MB: 8192k
1900 * 128MB: 11585k
1901 * 256MB: 16384k
1902 * 512MB: 23170k
1903 * 1GB: 32768k
1904 * 2GB: 46340k
1905 * 4GB: 65536k
1906 * 8GB: 92681k
1907 * 16GB: 131072k
1908 *
1909 * This allows larger machines to have larger/more transfers.
1910 * Limit the default to 256M
1911 */
1912 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
1913 if (nfs_congestion_kb > 256*1024)
1914 nfs_congestion_kb = 256*1024;
1915
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 return 0;
Jeff Layton3dd47652012-08-02 14:30:56 -04001917
1918out_destroy_commit_cache:
1919 kmem_cache_destroy(nfs_cdata_cachep);
1920out_destroy_write_mempool:
1921 mempool_destroy(nfs_wdata_mempool);
1922out_destroy_write_cache:
1923 kmem_cache_destroy(nfs_wdata_cachep);
1924 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925}
1926
David Brownell266bee82006-06-27 12:59:15 -07001927void nfs_destroy_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928{
1929 mempool_destroy(nfs_commit_mempool);
Jeff Layton3dd47652012-08-02 14:30:56 -04001930 kmem_cache_destroy(nfs_cdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931 mempool_destroy(nfs_wdata_mempool);
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001932 kmem_cache_destroy(nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933}
1934