blob: 6786873a290135ba1c74ffda8f2528e14e3c5ba5 [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);
Trond Myklebust788e7a82006-03-20 13:44:27 -050045static const struct rpc_call_ops nfs_commit_ops;
Fred Isaman061ae2e2012-04-20 14:47:48 -040046static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;
Fred Isamanf453a542012-04-20 14:47:54 -040047static const struct nfs_commit_completion_ops nfs_commit_completion_ops;
Anna Schumaker4a0de552014-05-06 09:12:30 -040048static const struct nfs_rw_ops nfs_rw_write_ops;
Weston Andros Adamsond4581382014-07-11 10:20:48 -040049static void nfs_clear_request_commit(struct nfs_page *req);
Weston Andros Adamson02d14262014-07-17 20:42:17 -040050static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
51 struct inode *inode);
Trond Myklebust3a3908c2014-09-08 22:21:00 -070052static struct nfs_page *
53nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
54 struct page *page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Christoph Lametere18b8902006-12-06 20:33:20 -080056static struct kmem_cache *nfs_wdata_cachep;
Trond Myklebust3feb2d42006-03-20 13:44:37 -050057static mempool_t *nfs_wdata_mempool;
Fred Isaman0b7c0152012-04-20 14:47:39 -040058static struct kmem_cache *nfs_cdata_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070059static mempool_t *nfs_commit_mempool;
60
Fred Isaman0b7c0152012-04-20 14:47:39 -040061struct nfs_commit_data *nfs_commitdata_alloc(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
Mel Gorman192e5012012-07-31 16:45:16 -070063 struct nfs_commit_data *p = mempool_alloc(nfs_commit_mempool, GFP_NOIO);
Chuck Lever40859d72005-11-30 18:09:02 -050064
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 if (p) {
66 memset(p, 0, sizeof(*p));
67 INIT_LIST_HEAD(&p->pages);
68 }
69 return p;
70}
Fred Isamane0c2b382011-03-23 13:27:53 +000071EXPORT_SYMBOL_GPL(nfs_commitdata_alloc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
Fred Isaman0b7c0152012-04-20 14:47:39 -040073void nfs_commit_free(struct nfs_commit_data *p)
Linus Torvalds1da177e2005-04-16 15:20:36 -070074{
75 mempool_free(p, nfs_commit_mempool);
76}
Fred Isamane0c2b382011-03-23 13:27:53 +000077EXPORT_SYMBOL_GPL(nfs_commit_free);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -040079static struct nfs_pgio_header *nfs_writehdr_alloc(void)
Trond Myklebust3feb2d42006-03-20 13:44:37 -050080{
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -040081 struct nfs_pgio_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
Trond Myklebust3feb2d42006-03-20 13:44:37 -050082
Anna Schumaker4a0de552014-05-06 09:12:30 -040083 if (p)
Trond Myklebust3feb2d42006-03-20 13:44:37 -050084 memset(p, 0, sizeof(*p));
Trond Myklebust3feb2d42006-03-20 13:44:37 -050085 return p;
86}
87
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -040088static void nfs_writehdr_free(struct nfs_pgio_header *hdr)
Fred Isaman6c75dc02012-04-20 14:47:47 -040089{
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -040090 mempool_free(hdr, nfs_wdata_mempool);
Trond Myklebust3feb2d42006-03-20 13:44:37 -050091}
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Trond Myklebust7b159fc2007-07-25 14:09:54 -040093static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
94{
95 ctx->error = error;
96 smp_wmb();
97 set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
98}
99
Weston Andros Adamson84d3a9a2014-07-11 10:20:47 -0400100/*
101 * nfs_page_find_head_request_locked - find head request associated with @page
102 *
103 * must be called while holding the inode lock.
104 *
105 * returns matching head request with reference held, or NULL if not found.
106 */
Mel Gorman29418aa2012-07-31 16:45:10 -0700107static struct nfs_page *
Weston Andros Adamson84d3a9a2014-07-11 10:20:47 -0400108nfs_page_find_head_request_locked(struct nfs_inode *nfsi, struct page *page)
Trond Myklebust277459d2006-12-05 00:35:35 -0500109{
110 struct nfs_page *req = NULL;
111
Mel Gorman29418aa2012-07-31 16:45:10 -0700112 if (PagePrivate(page))
Trond Myklebust277459d2006-12-05 00:35:35 -0500113 req = (struct nfs_page *)page_private(page);
Weston Andros Adamson02d14262014-07-17 20:42:17 -0400114 else if (unlikely(PageSwapCache(page)))
115 req = nfs_page_search_commits_for_head_request_locked(nfsi,
116 page);
Mel Gorman29418aa2012-07-31 16:45:10 -0700117
Weston Andros Adamson84d3a9a2014-07-11 10:20:47 -0400118 if (req) {
119 WARN_ON_ONCE(req->wb_head != req);
Mel Gorman29418aa2012-07-31 16:45:10 -0700120 kref_get(&req->wb_kref);
Weston Andros Adamson84d3a9a2014-07-11 10:20:47 -0400121 }
Mel Gorman29418aa2012-07-31 16:45:10 -0700122
Trond Myklebust277459d2006-12-05 00:35:35 -0500123 return req;
124}
125
Weston Andros Adamson84d3a9a2014-07-11 10:20:47 -0400126/*
127 * nfs_page_find_head_request - find head request associated with @page
128 *
129 * returns matching head request with reference held, or NULL if not found.
130 */
131static struct nfs_page *nfs_page_find_head_request(struct page *page)
Trond Myklebust277459d2006-12-05 00:35:35 -0500132{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700133 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebust277459d2006-12-05 00:35:35 -0500134 struct nfs_page *req = NULL;
Trond Myklebust277459d2006-12-05 00:35:35 -0500135
Trond Myklebust587142f2007-07-02 09:57:54 -0400136 spin_lock(&inode->i_lock);
Weston Andros Adamson84d3a9a2014-07-11 10:20:47 -0400137 req = nfs_page_find_head_request_locked(NFS_I(inode), page);
Trond Myklebust587142f2007-07-02 09:57:54 -0400138 spin_unlock(&inode->i_lock);
Trond Myklebust277459d2006-12-05 00:35:35 -0500139 return req;
140}
141
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142/* Adjust the file length if we're writing beyond the end */
143static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
144{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700145 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebusta3d01452008-06-11 12:21:19 -0400146 loff_t end, i_size;
147 pgoff_t end_index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Trond Myklebusta3d01452008-06-11 12:21:19 -0400149 spin_lock(&inode->i_lock);
150 i_size = i_size_read(inode);
151 end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
Mel Gormand56b4dd2012-07-31 16:45:06 -0700152 if (i_size > 0 && page_file_index(page) < end_index)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400153 goto out;
Mel Gormand56b4dd2012-07-31 16:45:06 -0700154 end = page_file_offset(page) + ((loff_t)offset+count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 if (i_size >= end)
Trond Myklebusta3d01452008-06-11 12:21:19 -0400156 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 i_size_write(inode, end);
Trond Myklebusta3d01452008-06-11 12:21:19 -0400158 nfs_inc_stats(inode, NFSIOS_EXTENDWRITE);
159out:
160 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161}
162
Trond Myklebusta301b772007-02-06 11:07:15 -0800163/* A writeback failed: mark the page as bad, and invalidate the page cache */
164static void nfs_set_pageerror(struct page *page)
165{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700166 nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
Trond Myklebusta301b772007-02-06 11:07:15 -0800167}
168
Weston Andros Adamsond72ddcb2014-05-15 11:56:48 -0400169/*
170 * nfs_page_group_search_locked
171 * @head - head request of page group
172 * @page_offset - offset into page
173 *
174 * Search page group with head @head to find a request that contains the
175 * page offset @page_offset.
176 *
177 * Returns a pointer to the first matching nfs request, or NULL if no
178 * match is found.
179 *
180 * Must be called with the page group lock held
181 */
182static struct nfs_page *
183nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset)
184{
185 struct nfs_page *req;
186
187 WARN_ON_ONCE(head != head->wb_head);
188 WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_head->wb_flags));
189
190 req = head;
191 do {
192 if (page_offset >= req->wb_pgbase &&
193 page_offset < (req->wb_pgbase + req->wb_bytes))
194 return req;
195
196 req = req->wb_this_page;
197 } while (req != head);
198
199 return NULL;
200}
201
202/*
203 * nfs_page_group_covers_page
204 * @head - head request of page group
205 *
206 * Return true if the page group with head @head covers the whole page,
207 * returns false otherwise
208 */
209static bool nfs_page_group_covers_page(struct nfs_page *req)
210{
211 struct nfs_page *tmp;
212 unsigned int pos = 0;
213 unsigned int len = nfs_page_length(req->wb_page);
214
Weston Andros Adamsonfd2f3a02014-08-08 11:00:53 -0400215 nfs_page_group_lock(req, false);
Weston Andros Adamsond72ddcb2014-05-15 11:56:48 -0400216
217 do {
218 tmp = nfs_page_group_search_locked(req->wb_head, pos);
219 if (tmp) {
220 /* no way this should happen */
221 WARN_ON_ONCE(tmp->wb_pgbase != pos);
222 pos += tmp->wb_bytes - (pos - tmp->wb_pgbase);
223 }
224 } while (tmp && pos < len);
225
226 nfs_page_group_unlock(req);
227 WARN_ON_ONCE(pos > len);
228 return pos == len;
229}
230
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231/* We can set the PG_uptodate flag if we see that a write request
232 * covers the full page.
233 */
Weston Andros Adamsond72ddcb2014-05-15 11:56:48 -0400234static void nfs_mark_uptodate(struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235{
Weston Andros Adamsond72ddcb2014-05-15 11:56:48 -0400236 if (PageUptodate(req->wb_page))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 return;
Weston Andros Adamsond72ddcb2014-05-15 11:56:48 -0400238 if (!nfs_page_group_covers_page(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 return;
Weston Andros Adamsond72ddcb2014-05-15 11:56:48 -0400240 SetPageUptodate(req->wb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241}
242
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243static int wb_priority(struct writeback_control *wbc)
244{
245 if (wbc->for_reclaim)
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400246 return FLUSH_HIGHPRI | FLUSH_STABLE;
Wu Fengguangb17621f2009-12-03 13:54:25 +0100247 if (wbc->for_kupdate || wbc->for_background)
Trond Myklebustb31268a2011-03-21 17:02:00 -0400248 return FLUSH_LOWPRI | FLUSH_COND_STABLE;
249 return FLUSH_COND_STABLE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250}
251
252/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800253 * NFS congestion control
254 */
255
256int nfs_congestion_kb;
257
258#define NFS_CONGESTION_ON_THRESH (nfs_congestion_kb >> (PAGE_SHIFT-10))
259#define NFS_CONGESTION_OFF_THRESH \
260 (NFS_CONGESTION_ON_THRESH - (NFS_CONGESTION_ON_THRESH >> 2))
261
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400262static void nfs_set_page_writeback(struct page *page)
Peter Zijlstra89a09142007-03-16 13:38:26 -0800263{
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400264 struct nfs_server *nfss = NFS_SERVER(page_file_mapping(page)->host);
Trond Myklebust5a6d41b2007-04-14 19:10:12 -0400265 int ret = test_set_page_writeback(page);
266
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400267 WARN_ON_ONCE(ret != 0);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800268
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400269 if (atomic_long_inc_return(&nfss->writeback) >
270 NFS_CONGESTION_ON_THRESH) {
271 set_bdi_congested(&nfss->backing_dev_info,
272 BLK_RW_ASYNC);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800273 }
274}
275
Weston Andros Adamson20633f02014-05-15 11:56:47 -0400276static void nfs_end_page_writeback(struct nfs_page *req)
Peter Zijlstra89a09142007-03-16 13:38:26 -0800277{
Weston Andros Adamson20633f02014-05-15 11:56:47 -0400278 struct inode *inode = page_file_mapping(req->wb_page)->host;
Peter Zijlstra89a09142007-03-16 13:38:26 -0800279 struct nfs_server *nfss = NFS_SERVER(inode);
280
Weston Andros Adamson20633f02014-05-15 11:56:47 -0400281 if (!nfs_page_group_sync_on_bit(req, PG_WB_END))
282 return;
283
284 end_page_writeback(req->wb_page);
Peter Zijlstrac4dc4be2007-10-16 23:25:41 -0700285 if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
Jens Axboe8aa7e842009-07-09 14:52:32 +0200286 clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
Peter Zijlstra89a09142007-03-16 13:38:26 -0800287}
288
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400289
290/* nfs_page_group_clear_bits
291 * @req - an nfs request
292 * clears all page group related bits from @req
293 */
294static void
295nfs_page_group_clear_bits(struct nfs_page *req)
Trond Myklebuste261f512006-12-05 00:35:41 -0500296{
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400297 clear_bit(PG_TEARDOWN, &req->wb_flags);
298 clear_bit(PG_UNLOCKPAGE, &req->wb_flags);
299 clear_bit(PG_UPTODATE, &req->wb_flags);
300 clear_bit(PG_WB_END, &req->wb_flags);
301 clear_bit(PG_REMOVE, &req->wb_flags);
302}
303
304
305/*
306 * nfs_unroll_locks_and_wait - unlock all newly locked reqs and wait on @req
307 *
308 * this is a helper function for nfs_lock_and_join_requests
309 *
310 * @inode - inode associated with request page group, must be holding inode lock
311 * @head - head request of page group, must be holding head lock
312 * @req - request that couldn't lock and needs to wait on the req bit lock
313 * @nonblock - if true, don't actually wait
314 *
315 * NOTE: this must be called holding page_group bit lock and inode spin lock
316 * and BOTH will be released before returning.
317 *
318 * returns 0 on success, < 0 on error.
319 */
320static int
321nfs_unroll_locks_and_wait(struct inode *inode, struct nfs_page *head,
322 struct nfs_page *req, bool nonblock)
323 __releases(&inode->i_lock)
324{
325 struct nfs_page *tmp;
Trond Myklebuste261f512006-12-05 00:35:41 -0500326 int ret;
327
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400328 /* relinquish all the locks successfully grabbed this run */
329 for (tmp = head ; tmp != req; tmp = tmp->wb_this_page)
330 nfs_unlock_request(tmp);
331
332 WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags));
333
334 /* grab a ref on the request that will be waited on */
335 kref_get(&req->wb_kref);
336
337 nfs_page_group_unlock(head);
Trond Myklebust587142f2007-07-02 09:57:54 -0400338 spin_unlock(&inode->i_lock);
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400339
340 /* release ref from nfs_page_find_head_request_locked */
341 nfs_release_request(head);
342
343 if (!nonblock)
344 ret = nfs_wait_on_request(req);
345 else
346 ret = -EAGAIN;
347 nfs_release_request(req);
348
349 return ret;
350}
351
352/*
353 * nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests
354 *
355 * @destroy_list - request list (using wb_this_page) terminated by @old_head
356 * @old_head - the old head of the list
357 *
358 * All subrequests must be locked and removed from all lists, so at this point
359 * they are only "active" in this function, and possibly in nfs_wait_on_request
360 * with a reference held by some other context.
361 */
362static void
363nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
364 struct nfs_page *old_head)
365{
366 while (destroy_list) {
367 struct nfs_page *subreq = destroy_list;
368
369 destroy_list = (subreq->wb_this_page == old_head) ?
370 NULL : subreq->wb_this_page;
371
372 WARN_ON_ONCE(old_head != subreq->wb_head);
373
374 /* make sure old group is not used */
375 subreq->wb_head = subreq;
376 subreq->wb_this_page = subreq;
377
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400378 /* subreq is now totally disconnected from page group or any
379 * write / commit lists. last chance to wake any waiters */
380 nfs_unlock_request(subreq);
381
382 if (!test_bit(PG_TEARDOWN, &subreq->wb_flags)) {
383 /* release ref on old head request */
384 nfs_release_request(old_head);
385
386 nfs_page_group_clear_bits(subreq);
387
388 /* release the PG_INODE_REF reference */
389 if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags))
390 nfs_release_request(subreq);
391 else
392 WARN_ON_ONCE(1);
393 } else {
394 WARN_ON_ONCE(test_bit(PG_CLEAN, &subreq->wb_flags));
395 /* zombie requests have already released the last
396 * reference and were waiting on the rest of the
397 * group to complete. Since it's no longer part of a
398 * group, simply free the request */
399 nfs_page_group_clear_bits(subreq);
400 nfs_free_request(subreq);
401 }
402 }
403}
404
405/*
406 * nfs_lock_and_join_requests - join all subreqs to the head req and return
407 * a locked reference, cancelling any pending
408 * operations for this page.
409 *
410 * @page - the page used to lookup the "page group" of nfs_page structures
411 * @nonblock - if true, don't block waiting for request locks
412 *
413 * This function joins all sub requests to the head request by first
414 * locking all requests in the group, cancelling any pending operations
415 * and finally updating the head request to cover the whole range covered by
416 * the (former) group. All subrequests are removed from any write or commit
417 * lists, unlinked from the group and destroyed.
418 *
419 * Returns a locked, referenced pointer to the head request - which after
420 * this call is guaranteed to be the only request associated with the page.
421 * Returns NULL if no requests are found for @page, or a ERR_PTR if an
422 * error was encountered.
423 */
424static struct nfs_page *
425nfs_lock_and_join_requests(struct page *page, bool nonblock)
426{
427 struct inode *inode = page_file_mapping(page)->host;
428 struct nfs_page *head, *subreq;
429 struct nfs_page *destroy_list = NULL;
430 unsigned int total_bytes;
431 int ret;
432
433try_again:
434 total_bytes = 0;
435
436 WARN_ON_ONCE(destroy_list);
437
438 spin_lock(&inode->i_lock);
439
440 /*
441 * A reference is taken only on the head request which acts as a
442 * reference to the whole page group - the group will not be destroyed
443 * until the head reference is released.
444 */
445 head = nfs_page_find_head_request_locked(NFS_I(inode), page);
446
447 if (!head) {
448 spin_unlock(&inode->i_lock);
449 return NULL;
450 }
451
Weston Andros Adamson7c3af972014-08-08 11:00:57 -0400452 /* holding inode lock, so always make a non-blocking call to try the
453 * page group lock */
Weston Andros Adamsonfd2f3a02014-08-08 11:00:53 -0400454 ret = nfs_page_group_lock(head, true);
Weston Andros Adamson94970012014-08-08 11:00:56 -0400455 if (ret < 0) {
456 spin_unlock(&inode->i_lock);
Weston Andros Adamson7c3af972014-08-08 11:00:57 -0400457
458 if (!nonblock && ret == -EAGAIN) {
459 nfs_page_group_lock_wait(head);
460 nfs_release_request(head);
461 goto try_again;
462 }
463
Weston Andros Adamson94970012014-08-08 11:00:56 -0400464 nfs_release_request(head);
Weston Andros Adamsone7029202014-07-17 20:42:15 -0400465 return ERR_PTR(ret);
Weston Andros Adamson94970012014-08-08 11:00:56 -0400466 }
Weston Andros Adamson7c3af972014-08-08 11:00:57 -0400467
468 /* lock each request in the page group */
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400469 subreq = head;
470 do {
471 /*
472 * Subrequests are always contiguous, non overlapping
473 * and in order. If not, it's a programming error.
474 */
475 WARN_ON_ONCE(subreq->wb_offset !=
476 (head->wb_offset + total_bytes));
477
478 /* keep track of how many bytes this group covers */
479 total_bytes += subreq->wb_bytes;
480
481 if (!nfs_lock_request(subreq)) {
482 /* releases page group bit lock and
483 * inode spin lock and all references */
484 ret = nfs_unroll_locks_and_wait(inode, head,
485 subreq, nonblock);
486
487 if (ret == 0)
488 goto try_again;
489
490 return ERR_PTR(ret);
491 }
492
493 subreq = subreq->wb_this_page;
494 } while (subreq != head);
495
496 /* Now that all requests are locked, make sure they aren't on any list.
497 * Commit list removal accounting is done after locks are dropped */
498 subreq = head;
499 do {
Weston Andros Adamson411a99a2014-07-17 20:42:19 -0400500 nfs_clear_request_commit(subreq);
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400501 subreq = subreq->wb_this_page;
502 } while (subreq != head);
503
504 /* unlink subrequests from head, destroy them later */
505 if (head->wb_this_page != head) {
506 /* destroy list will be terminated by head */
507 destroy_list = head->wb_this_page;
508 head->wb_this_page = head;
509
510 /* change head request to cover whole range that
511 * the former page group covered */
512 head->wb_bytes = total_bytes;
513 }
514
515 /*
516 * prepare head request to be added to new pgio descriptor
517 */
518 nfs_page_group_clear_bits(head);
519
520 /*
521 * some part of the group was still on the inode list - otherwise
522 * the group wouldn't be involved in async write.
523 * grab a reference for the head request, iff it needs one.
524 */
525 if (!test_and_set_bit(PG_INODE_REF, &head->wb_flags))
526 kref_get(&head->wb_kref);
527
528 nfs_page_group_unlock(head);
529
Weston Andros Adamson411a99a2014-07-17 20:42:19 -0400530 /* drop lock to clean uprequests on destroy list */
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400531 spin_unlock(&inode->i_lock);
532
533 nfs_destroy_unlinked_subrequests(destroy_list, head);
534
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400535 /* still holds ref on head from nfs_page_find_head_request_locked
536 * and still has lock on head from lock loop */
537 return head;
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400538}
539
540/*
541 * Find an associated nfs write request, and prepare to flush it out
542 * May return an error if the user signalled nfs_wait_on_request().
543 */
544static int nfs_page_async_flush(struct nfs_pageio_descriptor *pgio,
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400545 struct page *page, bool nonblock)
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400546{
547 struct nfs_page *req;
548 int ret = 0;
549
Weston Andros Adamsond4581382014-07-11 10:20:48 -0400550 req = nfs_lock_and_join_requests(page, nonblock);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400551 if (!req)
552 goto out;
553 ret = PTR_ERR(req);
554 if (IS_ERR(req))
555 goto out;
556
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400557 nfs_set_page_writeback(page);
558 WARN_ON_ONCE(test_bit(PG_CLEAN, &req->wb_flags));
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400559
Trond Myklebustdeed85e2012-10-15 15:02:01 -0400560 ret = 0;
Fred Isamanf8512ad2008-03-19 11:24:39 -0400561 if (!nfs_pageio_add_request(pgio, req)) {
562 nfs_redirty_request(req);
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400563 ret = pgio->pg_error;
Fred Isamanf8512ad2008-03-19 11:24:39 -0400564 }
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400565out:
566 return ret;
Trond Myklebuste261f512006-12-05 00:35:41 -0500567}
568
Trond Myklebustf758c8852007-07-22 19:27:32 -0400569static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
570{
Mel Gormand56b4dd2012-07-31 16:45:06 -0700571 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400572 int ret;
Trond Myklebustf758c8852007-07-22 19:27:32 -0400573
574 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
575 nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
576
Mel Gormand56b4dd2012-07-31 16:45:06 -0700577 nfs_pageio_cond_complete(pgio, page_file_index(page));
Wu Fengguang1b430be2010-10-26 14:21:26 -0700578 ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
Trond Myklebustcfb506e2010-07-30 15:31:57 -0400579 if (ret == -EAGAIN) {
580 redirty_page_for_writepage(wbc, page);
581 ret = 0;
582 }
583 return ret;
Trond Myklebustf758c8852007-07-22 19:27:32 -0400584}
585
Trond Myklebuste261f512006-12-05 00:35:41 -0500586/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 * Write an mmapped page to the server.
588 */
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500589static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400591 struct nfs_pageio_descriptor pgio;
Trond Myklebuste261f512006-12-05 00:35:41 -0500592 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593
Christoph Hellwiga20c93e2014-04-16 15:07:21 +0200594 nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc),
595 false, &nfs_async_write_completion_ops);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400596 err = nfs_do_writepage(page, wbc, &pgio);
597 nfs_pageio_complete(&pgio);
598 if (err < 0)
599 return err;
600 if (pgio.pg_error < 0)
601 return pgio.pg_error;
602 return 0;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500603}
604
605int nfs_writepage(struct page *page, struct writeback_control *wbc)
606{
Trond Myklebustf758c8852007-07-22 19:27:32 -0400607 int ret;
Trond Myklebust4d770cc2006-12-05 00:35:41 -0500608
Trond Myklebustf758c8852007-07-22 19:27:32 -0400609 ret = nfs_writepage_locked(page, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 unlock_page(page);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400611 return ret;
612}
613
614static int nfs_writepages_callback(struct page *page, struct writeback_control *wbc, void *data)
615{
616 int ret;
617
618 ret = nfs_do_writepage(page, wbc, data);
619 unlock_page(page);
620 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621}
622
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623int nfs_writepages(struct address_space *mapping, struct writeback_control *wbc)
624{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 struct inode *inode = mapping->host;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400626 unsigned long *bitlock = &NFS_I(inode)->flags;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400627 struct nfs_pageio_descriptor pgio;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 int err;
629
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400630 /* Stop dirtying of new pages while we sync */
NeilBrown74316202014-07-07 15:16:04 +1000631 err = wait_on_bit_lock_action(bitlock, NFS_INO_FLUSHING,
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400632 nfs_wait_bit_killable, TASK_KILLABLE);
633 if (err)
634 goto out_err;
635
Chuck Lever91d5b472006-03-20 13:44:14 -0500636 nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
637
Christoph Hellwiga20c93e2014-04-16 15:07:21 +0200638 nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false,
639 &nfs_async_write_completion_ops);
Trond Myklebustf758c8852007-07-22 19:27:32 -0400640 err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400641 nfs_pageio_complete(&pgio);
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400642
643 clear_bit_unlock(NFS_INO_FLUSHING, bitlock);
Peter Zijlstra4e857c52014-03-17 18:06:10 +0100644 smp_mb__after_atomic();
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400645 wake_up_bit(bitlock, NFS_INO_FLUSHING);
646
Trond Myklebustf758c8852007-07-22 19:27:32 -0400647 if (err < 0)
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400648 goto out_err;
649 err = pgio.pg_error;
650 if (err < 0)
651 goto out_err;
Trond Myklebustc63c7b02007-04-02 19:29:52 -0400652 return 0;
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400653out_err:
654 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655}
656
657/*
658 * Insert a write request into an inode
659 */
Fred Isamand6d6dc72012-03-08 17:29:35 -0500660static void nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661{
662 struct nfs_inode *nfsi = NFS_I(inode);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400663
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400664 WARN_ON_ONCE(req->wb_this_page != req);
665
Trond Myklebuste7d39062008-06-13 12:12:32 -0400666 /* Lock the request! */
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400667 nfs_lock_request(req);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400668
669 spin_lock(&inode->i_lock);
Bryan Schumaker011e2a72012-06-20 15:53:43 -0400670 if (!nfsi->npages && NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
Trond Myklebusta9a4a872011-10-17 16:08:46 -0700671 inode->i_version++;
Mel Gorman29418aa2012-07-31 16:45:10 -0700672 /*
673 * Swap-space should not get truncated. Hence no need to plug the race
674 * with invalidate/truncate.
675 */
676 if (likely(!PageSwapCache(req->wb_page))) {
677 set_bit(PG_MAPPED, &req->wb_flags);
678 SetPagePrivate(req->wb_page);
679 set_page_private(req->wb_page, (unsigned long)req);
680 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 nfsi->npages++;
Weston Andros Adamson17089a22014-07-11 10:20:45 -0400682 /* this a head request for a page group - mark it as having an
683 * extra reference so sub groups can follow suit */
684 WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
Trond Myklebustc03b4022007-06-17 13:26:38 -0400685 kref_get(&req->wb_kref);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400686 spin_unlock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687}
688
689/*
Peter Zijlstra89a09142007-03-16 13:38:26 -0800690 * Remove a write request from an inode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 */
692static void nfs_inode_remove_request(struct nfs_page *req)
693{
Al Viro3d4ff432011-06-22 18:40:12 -0400694 struct inode *inode = req->wb_context->dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 struct nfs_inode *nfsi = NFS_I(inode);
Weston Andros Adamson20633f02014-05-15 11:56:47 -0400696 struct nfs_page *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
Weston Andros Adamson20633f02014-05-15 11:56:47 -0400698 if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) {
699 head = req->wb_head;
700
701 spin_lock(&inode->i_lock);
702 if (likely(!PageSwapCache(head->wb_page))) {
703 set_page_private(head->wb_page, 0);
704 ClearPagePrivate(head->wb_page);
705 clear_bit(PG_MAPPED, &head->wb_flags);
706 }
707 nfsi->npages--;
708 spin_unlock(&inode->i_lock);
Mel Gorman29418aa2012-07-31 16:45:10 -0700709 }
Weston Andros Adamson17089a22014-07-11 10:20:45 -0400710
711 if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags))
712 nfs_release_request(req);
Weston Andros Adamsonb412ddf2014-07-17 20:42:16 -0400713 else
714 WARN_ON_ONCE(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715}
716
Trond Myklebust61822ab2006-12-05 00:35:42 -0500717static void
Fred6d884e82008-03-19 11:24:38 -0400718nfs_mark_request_dirty(struct nfs_page *req)
Trond Myklebust61822ab2006-12-05 00:35:42 -0500719{
Trond Myklebust61822ab2006-12-05 00:35:42 -0500720 __set_page_dirty_nobuffers(req->wb_page);
721}
722
Trond Myklebust3a3908c2014-09-08 22:21:00 -0700723/*
724 * nfs_page_search_commits_for_head_request_locked
725 *
726 * Search through commit lists on @inode for the head request for @page.
727 * Must be called while holding the inode (which is cinfo) lock.
728 *
729 * Returns the head request if found, or NULL if not found.
730 */
731static struct nfs_page *
732nfs_page_search_commits_for_head_request_locked(struct nfs_inode *nfsi,
733 struct page *page)
734{
735 struct nfs_page *freq, *t;
736 struct nfs_commit_info cinfo;
737 struct inode *inode = &nfsi->vfs_inode;
738
739 nfs_init_cinfo_from_inode(&cinfo, inode);
740
741 /* search through pnfs commit lists */
742 freq = pnfs_search_commit_reqs(inode, &cinfo, page);
743 if (freq)
744 return freq->wb_head;
745
746 /* Linearly search the commit list for the correct request */
747 list_for_each_entry_safe(freq, t, &cinfo.mds->list, wb_list) {
748 if (freq->wb_page == page)
749 return freq->wb_head;
750 }
751
752 return NULL;
753}
754
Trond Myklebust8dd37752012-03-15 17:16:40 -0400755/**
756 * nfs_request_add_commit_list - add request to a commit list
757 * @req: pointer to a struct nfs_page
Fred Isamanea2cf222012-04-20 14:47:53 -0400758 * @dst: commit list head
759 * @cinfo: holds list lock and accounting info
Trond Myklebust8dd37752012-03-15 17:16:40 -0400760 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400761 * This sets the PG_CLEAN bit, updates the cinfo count of
Trond Myklebust8dd37752012-03-15 17:16:40 -0400762 * number of outstanding requests requiring a commit as well as
763 * the MM page stats.
764 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400765 * The caller must _not_ hold the cinfo->lock, but must be
Trond Myklebust8dd37752012-03-15 17:16:40 -0400766 * holding the nfs_page lock.
767 */
768void
Fred Isamanea2cf222012-04-20 14:47:53 -0400769nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
770 struct nfs_commit_info *cinfo)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400771{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400772 set_bit(PG_CLEAN, &(req)->wb_flags);
Fred Isamanea2cf222012-04-20 14:47:53 -0400773 spin_lock(cinfo->lock);
774 nfs_list_add_request(req, dst);
775 cinfo->mds->ncommit++;
776 spin_unlock(cinfo->lock);
Fred Isaman56f9cd62012-04-20 14:47:56 -0400777 if (!cinfo->dreq) {
778 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Mel Gormand56b4dd2012-07-31 16:45:06 -0700779 inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
Fred Isaman56f9cd62012-04-20 14:47:56 -0400780 BDI_RECLAIMABLE);
781 __mark_inode_dirty(req->wb_context->dentry->d_inode,
782 I_DIRTY_DATASYNC);
783 }
Trond Myklebust8dd37752012-03-15 17:16:40 -0400784}
785EXPORT_SYMBOL_GPL(nfs_request_add_commit_list);
786
787/**
788 * nfs_request_remove_commit_list - Remove request from a commit list
789 * @req: pointer to a nfs_page
Fred Isamanea2cf222012-04-20 14:47:53 -0400790 * @cinfo: holds list lock and accounting info
Trond Myklebust8dd37752012-03-15 17:16:40 -0400791 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400792 * This clears the PG_CLEAN bit, and updates the cinfo's count of
Trond Myklebust8dd37752012-03-15 17:16:40 -0400793 * number of outstanding requests requiring a commit
794 * It does not update the MM page stats.
795 *
Fred Isamanea2cf222012-04-20 14:47:53 -0400796 * The caller _must_ hold the cinfo->lock and the nfs_page lock.
Trond Myklebust8dd37752012-03-15 17:16:40 -0400797 */
798void
Fred Isamanea2cf222012-04-20 14:47:53 -0400799nfs_request_remove_commit_list(struct nfs_page *req,
800 struct nfs_commit_info *cinfo)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400801{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400802 if (!test_and_clear_bit(PG_CLEAN, &(req)->wb_flags))
803 return;
804 nfs_list_remove_request(req);
Fred Isamanea2cf222012-04-20 14:47:53 -0400805 cinfo->mds->ncommit--;
Trond Myklebust8dd37752012-03-15 17:16:40 -0400806}
807EXPORT_SYMBOL_GPL(nfs_request_remove_commit_list);
808
Fred Isamanea2cf222012-04-20 14:47:53 -0400809static void nfs_init_cinfo_from_inode(struct nfs_commit_info *cinfo,
810 struct inode *inode)
811{
812 cinfo->lock = &inode->i_lock;
813 cinfo->mds = &NFS_I(inode)->commit_info;
814 cinfo->ds = pnfs_get_ds_info(inode);
Fred Isamanb359f9d2012-04-20 14:47:55 -0400815 cinfo->dreq = NULL;
Fred Isamanf453a542012-04-20 14:47:54 -0400816 cinfo->completion_ops = &nfs_commit_completion_ops;
Fred Isamanea2cf222012-04-20 14:47:53 -0400817}
818
819void nfs_init_cinfo(struct nfs_commit_info *cinfo,
820 struct inode *inode,
821 struct nfs_direct_req *dreq)
822{
Fred Isaman1763da12012-04-20 14:47:57 -0400823 if (dreq)
824 nfs_init_cinfo_from_dreq(cinfo, dreq);
825 else
826 nfs_init_cinfo_from_inode(cinfo, inode);
Fred Isamanea2cf222012-04-20 14:47:53 -0400827}
828EXPORT_SYMBOL_GPL(nfs_init_cinfo);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400829
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830/*
831 * Add a request to the inode's commit list.
832 */
Fred Isaman1763da12012-04-20 14:47:57 -0400833void
Fred Isamanea2cf222012-04-20 14:47:53 -0400834nfs_mark_request_commit(struct nfs_page *req, struct pnfs_layout_segment *lseg,
835 struct nfs_commit_info *cinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836{
Fred Isamanea2cf222012-04-20 14:47:53 -0400837 if (pnfs_mark_request_commit(req, lseg, cinfo))
Trond Myklebust8dd37752012-03-15 17:16:40 -0400838 return;
Fred Isamanea2cf222012-04-20 14:47:53 -0400839 nfs_request_add_commit_list(req, &cinfo->mds->list, cinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840}
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400841
Fred Isamand6d6dc72012-03-08 17:29:35 -0500842static void
843nfs_clear_page_commit(struct page *page)
844{
845 dec_zone_page_state(page, NR_UNSTABLE_NFS);
Mel Gormand56b4dd2012-07-31 16:45:06 -0700846 dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE);
Fred Isamand6d6dc72012-03-08 17:29:35 -0500847}
848
Weston Andros Adamson411a99a2014-07-17 20:42:19 -0400849/* Called holding inode (/cinfo) lock */
Trond Myklebust8dd37752012-03-15 17:16:40 -0400850static void
Trond Myklebuste468bae2008-06-13 13:25:22 -0400851nfs_clear_request_commit(struct nfs_page *req)
852{
Trond Myklebust8dd37752012-03-15 17:16:40 -0400853 if (test_bit(PG_CLEAN, &req->wb_flags)) {
854 struct inode *inode = req->wb_context->dentry->d_inode;
Fred Isamanea2cf222012-04-20 14:47:53 -0400855 struct nfs_commit_info cinfo;
Trond Myklebuste468bae2008-06-13 13:25:22 -0400856
Fred Isamanea2cf222012-04-20 14:47:53 -0400857 nfs_init_cinfo_from_inode(&cinfo, inode);
858 if (!pnfs_clear_request_commit(req, &cinfo)) {
Fred Isamanea2cf222012-04-20 14:47:53 -0400859 nfs_request_remove_commit_list(req, &cinfo);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400860 }
Fred Isamand6d6dc72012-03-08 17:29:35 -0500861 nfs_clear_page_commit(req->wb_page);
Trond Myklebuste468bae2008-06-13 13:25:22 -0400862 }
Trond Myklebuste468bae2008-06-13 13:25:22 -0400863}
864
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400865int nfs_write_need_commit(struct nfs_pgio_header *hdr)
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400866{
Weston Andros Adamsonc65e6252014-06-09 11:48:36 -0400867 if (hdr->verf.committed == NFS_DATA_SYNC)
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -0400868 return hdr->lseg == NULL;
Weston Andros Adamsonc65e6252014-06-09 11:48:36 -0400869 return hdr->verf.committed != NFS_FILE_SYNC;
Trond Myklebust8e821ca2007-04-20 16:12:34 -0400870}
871
Fred Isaman061ae2e2012-04-20 14:47:48 -0400872static void nfs_write_completion(struct nfs_pgio_header *hdr)
Fred Isaman6c75dc02012-04-20 14:47:47 -0400873{
Fred Isamanea2cf222012-04-20 14:47:53 -0400874 struct nfs_commit_info cinfo;
Fred Isaman6c75dc02012-04-20 14:47:47 -0400875 unsigned long bytes = 0;
876
877 if (test_bit(NFS_IOHDR_REDO, &hdr->flags))
878 goto out;
Fred Isamanea2cf222012-04-20 14:47:53 -0400879 nfs_init_cinfo_from_inode(&cinfo, hdr->inode);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400880 while (!list_empty(&hdr->pages)) {
881 struct nfs_page *req = nfs_list_entry(hdr->pages.next);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400882
883 bytes += req->wb_bytes;
884 nfs_list_remove_request(req);
885 if (test_bit(NFS_IOHDR_ERROR, &hdr->flags) &&
886 (hdr->good_bytes < bytes)) {
Trond Myklebustd1182b32012-05-09 13:37:43 -0400887 nfs_set_pageerror(req->wb_page);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400888 nfs_context_set_write_error(req->wb_context, hdr->error);
889 goto remove_req;
890 }
Weston Andros Adamsonc65e6252014-06-09 11:48:36 -0400891 if (nfs_write_need_commit(hdr)) {
Anna Schumakerf79d06f2014-05-06 09:12:28 -0400892 memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf));
Fred Isamanea2cf222012-04-20 14:47:53 -0400893 nfs_mark_request_commit(req, hdr->lseg, &cinfo);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400894 goto next;
895 }
896remove_req:
897 nfs_inode_remove_request(req);
898next:
Trond Myklebust1d1afcb2012-05-09 14:04:55 -0400899 nfs_unlock_request(req);
Weston Andros Adamson20633f02014-05-15 11:56:47 -0400900 nfs_end_page_writeback(req);
Trond Myklebust3aff4eb2012-05-09 14:30:35 -0400901 nfs_release_request(req);
Fred Isaman6c75dc02012-04-20 14:47:47 -0400902 }
903out:
904 hdr->release(hdr);
905}
906
Anna Schumakerce595152014-05-06 09:12:34 -0400907unsigned long
Fred Isamanea2cf222012-04-20 14:47:53 -0400908nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400909{
Fred Isamanea2cf222012-04-20 14:47:53 -0400910 return cinfo->mds->ncommit;
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400911}
912
Fred Isamanea2cf222012-04-20 14:47:53 -0400913/* cinfo->lock held by caller */
Fred Isaman1763da12012-04-20 14:47:57 -0400914int
Fred Isamanea2cf222012-04-20 14:47:53 -0400915nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
916 struct nfs_commit_info *cinfo, int max)
Fred Isamand6d6dc72012-03-08 17:29:35 -0500917{
918 struct nfs_page *req, *tmp;
919 int ret = 0;
920
921 list_for_each_entry_safe(req, tmp, src, wb_list) {
Trond Myklebust8dd37752012-03-15 17:16:40 -0400922 if (!nfs_lock_request(req))
923 continue;
Trond Myklebust7ad84aa2012-05-09 13:19:15 -0400924 kref_get(&req->wb_kref);
Fred Isamanea2cf222012-04-20 14:47:53 -0400925 if (cond_resched_lock(cinfo->lock))
Trond Myklebust3b3be882012-03-17 11:59:30 -0400926 list_safe_reset_next(req, tmp, wb_list);
Fred Isamanea2cf222012-04-20 14:47:53 -0400927 nfs_request_remove_commit_list(req, cinfo);
Trond Myklebust8dd37752012-03-15 17:16:40 -0400928 nfs_list_add_request(req, dst);
929 ret++;
Fred Isaman1763da12012-04-20 14:47:57 -0400930 if ((ret == max) && !cinfo->dreq)
Trond Myklebust8dd37752012-03-15 17:16:40 -0400931 break;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500932 }
933 return ret;
934}
Fred Isamand6d6dc72012-03-08 17:29:35 -0500935
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936/*
937 * nfs_scan_commit - Scan an inode for commit requests
938 * @inode: NFS inode to scan
Fred Isamanea2cf222012-04-20 14:47:53 -0400939 * @dst: mds destination list
940 * @cinfo: mds and ds lists of reqs ready to commit
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 *
942 * Moves requests from the inode's 'commit' request list.
943 * The requests are *not* checked to ensure that they form a contiguous set.
944 */
Fred Isaman1763da12012-04-20 14:47:57 -0400945int
Fred Isamanea2cf222012-04-20 14:47:53 -0400946nfs_scan_commit(struct inode *inode, struct list_head *dst,
947 struct nfs_commit_info *cinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948{
Fred Isamand6d6dc72012-03-08 17:29:35 -0500949 int ret = 0;
Trond Myklebustfb8a1f12009-03-11 14:10:29 -0400950
Fred Isamanea2cf222012-04-20 14:47:53 -0400951 spin_lock(cinfo->lock);
952 if (cinfo->mds->ncommit > 0) {
Trond Myklebust8dd37752012-03-15 17:16:40 -0400953 const int max = INT_MAX;
Fred Isamand6d6dc72012-03-08 17:29:35 -0500954
Fred Isamanea2cf222012-04-20 14:47:53 -0400955 ret = nfs_scan_commit_list(&cinfo->mds->list, dst,
956 cinfo, max);
957 ret += pnfs_scan_commit_lists(inode, cinfo, max - ret);
Fred Isamand6d6dc72012-03-08 17:29:35 -0500958 }
Fred Isamanea2cf222012-04-20 14:47:53 -0400959 spin_unlock(cinfo->lock);
Trond Myklebustff778d02010-02-19 16:53:39 -0800960 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961}
Fred Isamand6d6dc72012-03-08 17:29:35 -0500962
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963/*
Trond Myklebuste7d39062008-06-13 12:12:32 -0400964 * Search for an existing write request, and attempt to update
965 * it to reflect a new dirty region on a given page.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 *
Trond Myklebuste7d39062008-06-13 12:12:32 -0400967 * If the attempt fails, then the existing request is flushed out
968 * to disk.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 */
Trond Myklebuste7d39062008-06-13 12:12:32 -0400970static struct nfs_page *nfs_try_to_update_request(struct inode *inode,
971 struct page *page,
972 unsigned int offset,
973 unsigned int bytes)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974{
Trond Myklebuste7d39062008-06-13 12:12:32 -0400975 struct nfs_page *req;
976 unsigned int rqend;
977 unsigned int end;
978 int error;
979
980 if (!PagePrivate(page))
981 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
983 end = offset + bytes;
Trond Myklebuste7d39062008-06-13 12:12:32 -0400984 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 for (;;) {
Weston Andros Adamson84d3a9a2014-07-11 10:20:47 -0400987 req = nfs_page_find_head_request_locked(NFS_I(inode), page);
Trond Myklebuste7d39062008-06-13 12:12:32 -0400988 if (req == NULL)
989 goto out_unlock;
Trond Myklebust277459d2006-12-05 00:35:35 -0500990
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -0400991 /* should be handled by nfs_flush_incompatible */
992 WARN_ON_ONCE(req->wb_head != req);
993 WARN_ON_ONCE(req->wb_this_page != req);
994
Trond Myklebuste7d39062008-06-13 12:12:32 -0400995 rqend = req->wb_offset + req->wb_bytes;
996 /*
997 * Tell the caller to flush out the request if
998 * the offsets are non-contiguous.
999 * Note: nfs_flush_incompatible() will already
1000 * have flushed out requests having wrong owners.
1001 */
Trond Myklebuste468bae2008-06-13 13:25:22 -04001002 if (offset > rqend
Trond Myklebuste7d39062008-06-13 12:12:32 -04001003 || end < req->wb_offset)
1004 goto out_flushme;
1005
Trond Myklebust7ad84aa2012-05-09 13:19:15 -04001006 if (nfs_lock_request(req))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008
Trond Myklebuste7d39062008-06-13 12:12:32 -04001009 /* The request is locked, so wait and then retry */
Trond Myklebust587142f2007-07-02 09:57:54 -04001010 spin_unlock(&inode->i_lock);
Trond Myklebuste7d39062008-06-13 12:12:32 -04001011 error = nfs_wait_on_request(req);
1012 nfs_release_request(req);
1013 if (error != 0)
1014 goto out_err;
1015 spin_lock(&inode->i_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 }
1017
1018 /* Okay, the request matches. Update the region */
1019 if (offset < req->wb_offset) {
1020 req->wb_offset = offset;
1021 req->wb_pgbase = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 if (end > rqend)
1024 req->wb_bytes = end - req->wb_offset;
Trond Myklebuste7d39062008-06-13 12:12:32 -04001025 else
1026 req->wb_bytes = rqend - req->wb_offset;
1027out_unlock:
Fred Isamanca138f32012-04-05 15:26:36 -04001028 if (req)
1029 nfs_clear_request_commit(req);
Weston Andros Adamson411a99a2014-07-17 20:42:19 -04001030 spin_unlock(&inode->i_lock);
Trond Myklebuste7d39062008-06-13 12:12:32 -04001031 return req;
1032out_flushme:
1033 spin_unlock(&inode->i_lock);
1034 nfs_release_request(req);
1035 error = nfs_wb_page(inode, page);
1036out_err:
1037 return ERR_PTR(error);
1038}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
Trond Myklebuste7d39062008-06-13 12:12:32 -04001040/*
1041 * Try to update an existing write request, or create one if there is none.
1042 *
1043 * Note: Should always be called with the Page Lock held to prevent races
1044 * if we have to add a new request. Also assumes that the caller has
1045 * already called nfs_flush_incompatible() if necessary.
1046 */
1047static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
1048 struct page *page, unsigned int offset, unsigned int bytes)
1049{
Mel Gormand56b4dd2012-07-31 16:45:06 -07001050 struct inode *inode = page_file_mapping(page)->host;
Trond Myklebuste7d39062008-06-13 12:12:32 -04001051 struct nfs_page *req;
Trond Myklebuste7d39062008-06-13 12:12:32 -04001052
1053 req = nfs_try_to_update_request(inode, page, offset, bytes);
1054 if (req != NULL)
1055 goto out;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001056 req = nfs_create_request(ctx, page, NULL, offset, bytes);
Trond Myklebuste7d39062008-06-13 12:12:32 -04001057 if (IS_ERR(req))
1058 goto out;
Fred Isamand6d6dc72012-03-08 17:29:35 -05001059 nfs_inode_add_request(inode, req);
Trond Myklebustefc91ed2008-06-10 18:31:00 -04001060out:
Trond Myklebust61e930a2007-10-18 17:08:05 -04001061 return req;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062}
1063
Trond Myklebuste7d39062008-06-13 12:12:32 -04001064static int nfs_writepage_setup(struct nfs_open_context *ctx, struct page *page,
1065 unsigned int offset, unsigned int count)
1066{
1067 struct nfs_page *req;
1068
1069 req = nfs_setup_write_request(ctx, page, offset, count);
1070 if (IS_ERR(req))
1071 return PTR_ERR(req);
1072 /* Update file length */
1073 nfs_grow_file(page, offset, count);
Weston Andros Adamsond72ddcb2014-05-15 11:56:48 -04001074 nfs_mark_uptodate(req);
Trond Myklebusta6305dd2010-04-09 19:07:08 -04001075 nfs_mark_request_dirty(req);
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001076 nfs_unlock_and_release_request(req);
Trond Myklebuste7d39062008-06-13 12:12:32 -04001077 return 0;
1078}
1079
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080int nfs_flush_incompatible(struct file *file, struct page *page)
1081{
Trond Myklebustcd3758e2007-08-10 17:44:32 -04001082 struct nfs_open_context *ctx = nfs_file_open_context(file);
Trond Myklebust2a369152012-08-13 18:54:45 -04001083 struct nfs_lock_context *l_ctx;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 struct nfs_page *req;
Trond Myklebust1a545332006-12-05 00:35:40 -05001085 int do_flush, status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 /*
1087 * Look for a request corresponding to this page. If there
1088 * is one, and it belongs to another file, we flush it out
1089 * before we try to copy anything into the page. Do this
1090 * due to the lack of an ACCESS-type call in NFSv2.
1091 * Also do the same if we find a request from an existing
1092 * dropped page.
1093 */
Trond Myklebust1a545332006-12-05 00:35:40 -05001094 do {
Weston Andros Adamson84d3a9a2014-07-11 10:20:47 -04001095 req = nfs_page_find_head_request(page);
Trond Myklebust1a545332006-12-05 00:35:40 -05001096 if (req == NULL)
1097 return 0;
Trond Myklebust2a369152012-08-13 18:54:45 -04001098 l_ctx = req->wb_lock_context;
1099 do_flush = req->wb_page != page || req->wb_context != ctx;
Weston Andros Adamson2bfc6e52014-05-15 11:56:45 -04001100 /* for now, flush if more than 1 request in page_group */
1101 do_flush |= req->wb_this_page != req;
Trond Myklebust0f1d2602013-09-05 15:52:51 -04001102 if (l_ctx && ctx->dentry->d_inode->i_flock != NULL) {
Trond Myklebust2a369152012-08-13 18:54:45 -04001103 do_flush |= l_ctx->lockowner.l_owner != current->files
1104 || l_ctx->lockowner.l_pid != current->tgid;
1105 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 nfs_release_request(req);
Trond Myklebust1a545332006-12-05 00:35:40 -05001107 if (!do_flush)
1108 return 0;
Mel Gormand56b4dd2012-07-31 16:45:06 -07001109 status = nfs_wb_page(page_file_mapping(page)->host, page);
Trond Myklebust1a545332006-12-05 00:35:40 -05001110 } while (status == 0);
1111 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112}
1113
1114/*
Andy Adamsondc248262013-08-14 11:59:16 -04001115 * Avoid buffered writes when a open context credential's key would
1116 * expire soon.
1117 *
1118 * Returns -EACCES if the key will expire within RPC_KEY_EXPIRE_FAIL.
1119 *
1120 * Return 0 and set a credential flag which triggers the inode to flush
1121 * and performs NFS_FILE_SYNC writes if the key will expired within
1122 * RPC_KEY_EXPIRE_TIMEO.
1123 */
1124int
1125nfs_key_timeout_notify(struct file *filp, struct inode *inode)
1126{
1127 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1128 struct rpc_auth *auth = NFS_SERVER(inode)->client->cl_auth;
1129
1130 return rpcauth_key_timeout_notify(auth, ctx->cred);
1131}
1132
1133/*
1134 * Test if the open context credential key is marked to expire soon.
1135 */
1136bool nfs_ctx_key_to_expire(struct nfs_open_context *ctx)
1137{
1138 return rpcauth_cred_key_to_expire(ctx->cred);
1139}
1140
1141/*
Trond Myklebust5d47a352008-02-07 17:24:07 -05001142 * If the page cache is marked as unsafe or invalid, then we can't rely on
1143 * the PageUptodate() flag. In this case, we will need to turn off
1144 * write optimisations that depend on the page contents being correct.
1145 */
Trond Myklebust8d197a52012-04-29 12:50:01 -04001146static bool nfs_write_pageuptodate(struct page *page, struct inode *inode)
Trond Myklebust5d47a352008-02-07 17:24:07 -05001147{
Jeff Laytond529ef82014-01-27 13:46:15 -05001148 struct nfs_inode *nfsi = NFS_I(inode);
1149
Trond Myklebust8d197a52012-04-29 12:50:01 -04001150 if (nfs_have_delegated_attributes(inode))
1151 goto out;
Scott Mayhew18dd78c2014-06-20 08:44:42 -04001152 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
Jeff Laytond529ef82014-01-27 13:46:15 -05001153 return false;
Jeff Layton4db72b42014-01-28 13:47:46 -05001154 smp_rmb();
Jeff Laytond529ef82014-01-27 13:46:15 -05001155 if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags))
Trond Myklebust8d197a52012-04-29 12:50:01 -04001156 return false;
1157out:
Scott Mayhew18dd78c2014-06-20 08:44:42 -04001158 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1159 return false;
Trond Myklebust8d197a52012-04-29 12:50:01 -04001160 return PageUptodate(page) != 0;
Trond Myklebust5d47a352008-02-07 17:24:07 -05001161}
1162
Scott Mayhewc7559662013-07-05 17:33:19 -04001163/* If we know the page is up to date, and we're not using byte range locks (or
1164 * if we have the whole file locked for writing), it may be more efficient to
1165 * extend the write to cover the entire page in order to avoid fragmentation
1166 * inefficiencies.
1167 *
Scott Mayhew263b4502014-01-17 15:12:05 -05001168 * If the file is opened for synchronous writes then we can just skip the rest
1169 * of the checks.
Scott Mayhewc7559662013-07-05 17:33:19 -04001170 */
1171static int nfs_can_extend_write(struct file *file, struct page *page, struct inode *inode)
1172{
1173 if (file->f_flags & O_DSYNC)
1174 return 0;
Scott Mayhew263b4502014-01-17 15:12:05 -05001175 if (!nfs_write_pageuptodate(page, inode))
1176 return 0;
Scott Mayhewc7559662013-07-05 17:33:19 -04001177 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE))
1178 return 1;
Scott Mayhew263b4502014-01-17 15:12:05 -05001179 if (inode->i_flock == NULL || (inode->i_flock->fl_start == 0 &&
Scott Mayhewc7559662013-07-05 17:33:19 -04001180 inode->i_flock->fl_end == OFFSET_MAX &&
Scott Mayhew263b4502014-01-17 15:12:05 -05001181 inode->i_flock->fl_type != F_RDLCK))
Scott Mayhewc7559662013-07-05 17:33:19 -04001182 return 1;
1183 return 0;
1184}
1185
Trond Myklebust5d47a352008-02-07 17:24:07 -05001186/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 * Update and possibly write a cached page of an NFS file.
1188 *
1189 * XXX: Keep an eye on generic_file_read to make sure it doesn't do bad
1190 * things with a page scheduled for an RPC call (e.g. invalidate it).
1191 */
1192int nfs_updatepage(struct file *file, struct page *page,
1193 unsigned int offset, unsigned int count)
1194{
Trond Myklebustcd3758e2007-08-10 17:44:32 -04001195 struct nfs_open_context *ctx = nfs_file_open_context(file);
Mel Gormand56b4dd2012-07-31 16:45:06 -07001196 struct inode *inode = page_file_mapping(page)->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 int status = 0;
1198
Chuck Lever91d5b472006-03-20 13:44:14 -05001199 nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
1200
Al Viro6de14722013-09-16 10:53:17 -04001201 dprintk("NFS: nfs_updatepage(%pD2 %d@%lld)\n",
1202 file, count, (long long)(page_file_offset(page) + offset));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203
Scott Mayhewc7559662013-07-05 17:33:19 -04001204 if (nfs_can_extend_write(file, page, inode)) {
Trond Myklebust49a70f22006-12-05 00:35:38 -05001205 count = max(count + offset, nfs_page_length(page));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206 offset = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 }
1208
Trond Myklebuste21195a2006-12-05 00:35:39 -05001209 status = nfs_writepage_setup(ctx, page, offset, count);
Trond Myklebust03fa9e82008-06-05 16:02:35 -04001210 if (status < 0)
1211 nfs_set_pageerror(page);
Trond Myklebust59b7c052011-10-17 18:22:55 -07001212 else
1213 __set_page_dirty_nobuffers(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
Chuck Lever48186c72008-06-11 17:56:05 -04001215 dprintk("NFS: nfs_updatepage returns %d (isize %lld)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 status, (long long)i_size_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 return status;
1218}
1219
Trond Myklebust3ff75762007-07-14 15:40:00 -04001220static int flush_task_priority(int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221{
1222 switch (how & (FLUSH_HIGHPRI|FLUSH_LOWPRI)) {
1223 case FLUSH_HIGHPRI:
1224 return RPC_PRIORITY_HIGH;
1225 case FLUSH_LOWPRI:
1226 return RPC_PRIORITY_LOW;
1227 }
1228 return RPC_PRIORITY_NORMAL;
1229}
1230
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001231static void nfs_initiate_write(struct nfs_pgio_header *hdr,
1232 struct rpc_message *msg,
Anna Schumaker1ed26f32014-05-06 09:12:37 -04001233 struct rpc_task_setup *task_setup_data, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001235 struct inode *inode = hdr->inode;
Trond Myklebust3ff75762007-07-14 15:40:00 -04001236 int priority = flush_task_priority(how);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237
Anna Schumaker1ed26f32014-05-06 09:12:37 -04001238 task_setup_data->priority = priority;
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001239 NFS_PROTO(inode)->write_setup(hdr, msg);
Andy Adamsond138d5d2011-03-03 15:13:41 +00001240
Weston Andros Adamson8c21c622013-08-13 16:37:37 -04001241 nfs4_state_protect_write(NFS_SERVER(inode)->nfs_client,
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001242 &task_setup_data->rpc_client, msg, hdr);
Trond Myklebust275acaa2011-07-12 13:42:02 -04001243}
1244
Fred6d884e82008-03-19 11:24:38 -04001245/* If a nfs_flush_* function fails, it should remove reqs from @head and
1246 * call this on each, which will prepare them to be retried on next
1247 * writeback using standard nfs.
1248 */
1249static void nfs_redirty_request(struct nfs_page *req)
1250{
1251 nfs_mark_request_dirty(req);
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001252 nfs_unlock_request(req);
Weston Andros Adamson20633f02014-05-15 11:56:47 -04001253 nfs_end_page_writeback(req);
Trond Myklebust3aff4eb2012-05-09 14:30:35 -04001254 nfs_release_request(req);
Fred6d884e82008-03-19 11:24:38 -04001255}
1256
Fred Isaman061ae2e2012-04-20 14:47:48 -04001257static void nfs_async_write_error(struct list_head *head)
Fred Isaman6c75dc02012-04-20 14:47:47 -04001258{
1259 struct nfs_page *req;
1260
1261 while (!list_empty(head)) {
1262 req = nfs_list_entry(head->next);
1263 nfs_list_remove_request(req);
1264 nfs_redirty_request(req);
1265 }
1266}
1267
Fred Isaman061ae2e2012-04-20 14:47:48 -04001268static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
1269 .error_cleanup = nfs_async_write_error,
1270 .completion = nfs_write_completion,
1271};
1272
Bryan Schumaker57208fa2012-06-20 15:53:48 -04001273void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
Christoph Hellwiga20c93e2014-04-16 15:07:21 +02001274 struct inode *inode, int ioflags, bool force_mds,
Fred Isaman061ae2e2012-04-20 14:47:48 -04001275 const struct nfs_pgio_completion_ops *compl_ops)
Trond Myklebust1751c362011-06-10 13:30:23 -04001276{
Christoph Hellwiga20c93e2014-04-16 15:07:21 +02001277 struct nfs_server *server = NFS_SERVER(inode);
Anna Schumaker41d8d5b2014-05-06 09:12:40 -04001278 const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops;
Christoph Hellwiga20c93e2014-04-16 15:07:21 +02001279
1280#ifdef CONFIG_NFS_V4_1
1281 if (server->pnfs_curr_ld && !force_mds)
1282 pg_ops = server->pnfs_curr_ld->pg_write_ops;
1283#endif
Anna Schumaker4a0de552014-05-06 09:12:30 -04001284 nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops,
1285 server->wsize, ioflags);
Trond Myklebust1751c362011-06-10 13:30:23 -04001286}
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{
Anna Schumaker41d8d5b2014-05-06 09:12:40 -04001291 pgio->pg_ops = &nfs_pgio_rw_ops;
Trond Myklebustdce81292011-07-13 15:59:19 -04001292 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
Fred Isaman0b7c0152012-04-20 14:47:39 -04001297void nfs_commit_prepare(struct rpc_task *task, void *calldata)
1298{
1299 struct nfs_commit_data *data = calldata;
1300
1301 NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
1302}
1303
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001304static void nfs_writeback_release_common(struct nfs_pgio_header *hdr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305{
Weston Andros Adamsonc65e6252014-06-09 11:48:36 -04001306 /* do nothing! */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307}
1308
Trond Myklebust1f2edbe2014-04-13 11:11:31 -04001309/*
1310 * Special version of should_remove_suid() that ignores capabilities.
1311 */
1312static int nfs_should_remove_suid(const struct inode *inode)
1313{
1314 umode_t mode = inode->i_mode;
1315 int kill = 0;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001316
Trond Myklebust1f2edbe2014-04-13 11:11:31 -04001317 /* suid always must be killed */
1318 if (unlikely(mode & S_ISUID))
1319 kill = ATTR_KILL_SUID;
1320
1321 /*
1322 * sgid without any exec bits is just a mandatory locking mark; leave
1323 * it alone. If some exec bits are set, it's a real sgid; kill it.
1324 */
1325 if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
1326 kill |= ATTR_KILL_SGID;
1327
1328 if (unlikely(kill && S_ISREG(mode)))
1329 return kill;
1330
1331 return 0;
1332}
Trond Myklebust788e7a82006-03-20 13:44:27 -05001333
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334/*
1335 * This function is called when the WRITE call is complete.
1336 */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001337static int nfs_writeback_done(struct rpc_task *task,
1338 struct nfs_pgio_header *hdr,
Anna Schumaker0eecb212014-05-06 09:12:32 -04001339 struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340{
Trond Myklebust788e7a82006-03-20 13:44:27 -05001341 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342
Chuck Leverf551e442006-09-20 14:33:04 -04001343 /*
1344 * ->write_done will attempt to use post-op attributes to detect
1345 * conflicting writes by other clients. A strict interpretation
1346 * of close-to-open would allow us to continue caching even if
1347 * another writer had changed the file, but some applications
1348 * depend on tighter cache coherency when writing.
1349 */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001350 status = NFS_PROTO(inode)->write_done(task, hdr);
Trond Myklebust788e7a82006-03-20 13:44:27 -05001351 if (status != 0)
Anna Schumaker0eecb212014-05-06 09:12:32 -04001352 return status;
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001353 nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count);
Chuck Lever91d5b472006-03-20 13:44:14 -05001354
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001355 if (hdr->res.verf->committed < hdr->args.stable &&
1356 task->tk_status >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 /* We tried a write call, but the server did not
1358 * commit data to stable storage even though we
1359 * requested it.
1360 * Note: There is a known bug in Tru64 < 5.0 in which
1361 * the server reports NFS_DATA_SYNC, but performs
1362 * NFS_FILE_SYNC. We therefore implement this checking
1363 * as a dprintk() in order to avoid filling syslog.
1364 */
1365 static unsigned long complain;
1366
Fred Isamana69aef12011-03-03 15:13:47 +00001367 /* Note this will print the MDS for a DS write */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 if (time_before(complain, jiffies)) {
Chuck Lever48186c72008-06-11 17:56:05 -04001369 dprintk("NFS: faulty NFS server %s:"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 " (committed = %d) != (stable = %d)\n",
Fred Isamancd841602012-04-20 14:47:44 -04001371 NFS_SERVER(inode)->nfs_client->cl_hostname,
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001372 hdr->res.verf->committed, hdr->args.stable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 complain = jiffies + 300 * HZ;
1374 }
1375 }
Trond Myklebust1f2edbe2014-04-13 11:11:31 -04001376
1377 /* Deal with the suid/sgid bit corner case */
1378 if (nfs_should_remove_suid(inode))
1379 nfs_mark_for_revalidate(inode);
Anna Schumaker0eecb212014-05-06 09:12:32 -04001380 return 0;
1381}
1382
1383/*
1384 * This function is called when the WRITE call is complete.
1385 */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001386static void nfs_writeback_result(struct rpc_task *task,
1387 struct nfs_pgio_header *hdr)
Anna Schumaker0eecb212014-05-06 09:12:32 -04001388{
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001389 struct nfs_pgio_args *argp = &hdr->args;
1390 struct nfs_pgio_res *resp = &hdr->res;
Trond Myklebust1f2edbe2014-04-13 11:11:31 -04001391
1392 if (resp->count < argp->count) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 static unsigned long complain;
1394
Fred Isaman6c75dc02012-04-20 14:47:47 -04001395 /* This a short write! */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001396 nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE);
Chuck Lever91d5b472006-03-20 13:44:14 -05001397
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 /* Has the server at least made some progress? */
Fred Isaman6c75dc02012-04-20 14:47:47 -04001399 if (resp->count == 0) {
1400 if (time_before(complain, jiffies)) {
1401 printk(KERN_WARNING
1402 "NFS: Server wrote zero bytes, expected %u.\n",
1403 argp->count);
1404 complain = jiffies + 300 * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 }
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001406 nfs_set_pgio_error(hdr, -EIO, argp->offset);
Fred Isaman6c75dc02012-04-20 14:47:47 -04001407 task->tk_status = -EIO;
Fred Isaman13602892011-02-11 15:42:38 +00001408 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001410 /* Was this an NFSv2 write or an NFSv3 stable write? */
1411 if (resp->verf->committed != NFS_UNSTABLE) {
1412 /* Resend from where the server left off */
Weston Andros Adamsond45f60c2014-06-09 11:48:35 -04001413 hdr->mds_offset += resp->count;
Fred Isaman6c75dc02012-04-20 14:47:47 -04001414 argp->offset += resp->count;
1415 argp->pgbase += resp->count;
1416 argp->count -= resp->count;
1417 } else {
1418 /* Resend as a stable write in order to avoid
1419 * headaches in the case of a server crash.
1420 */
1421 argp->stable = NFS_FILE_SYNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 }
Fred Isaman6c75dc02012-04-20 14:47:47 -04001423 rpc_restart_call_prepare(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425}
1426
1427
Trond Myklebust71d0a612010-04-22 15:35:57 -04001428static int nfs_commit_set_lock(struct nfs_inode *nfsi, int may_wait)
1429{
Trond Myklebustb8413f92011-03-21 15:37:01 -04001430 int ret;
1431
Trond Myklebust71d0a612010-04-22 15:35:57 -04001432 if (!test_and_set_bit(NFS_INO_COMMIT, &nfsi->flags))
1433 return 1;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001434 if (!may_wait)
1435 return 0;
1436 ret = out_of_line_wait_on_bit_lock(&nfsi->flags,
1437 NFS_INO_COMMIT,
1438 nfs_wait_bit_killable,
1439 TASK_KILLABLE);
1440 return (ret < 0) ? ret : 1;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001441}
1442
Fred Isamanf453a542012-04-20 14:47:54 -04001443static void nfs_commit_clear_lock(struct nfs_inode *nfsi)
Trond Myklebust71d0a612010-04-22 15:35:57 -04001444{
1445 clear_bit(NFS_INO_COMMIT, &nfsi->flags);
Peter Zijlstra4e857c52014-03-17 18:06:10 +01001446 smp_mb__after_atomic();
Trond Myklebust71d0a612010-04-22 15:35:57 -04001447 wake_up_bit(&nfsi->flags, NFS_INO_COMMIT);
1448}
1449
Fred Isaman0b7c0152012-04-20 14:47:39 -04001450void nfs_commitdata_release(struct nfs_commit_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001452 put_nfs_open_context(data->context);
1453 nfs_commit_free(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454}
Fred Isamane0c2b382011-03-23 13:27:53 +00001455EXPORT_SYMBOL_GPL(nfs_commitdata_release);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456
Fred Isaman0b7c0152012-04-20 14:47:39 -04001457int nfs_initiate_commit(struct rpc_clnt *clnt, struct nfs_commit_data *data,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001458 const struct rpc_call_ops *call_ops,
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001459 int how, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460{
Trond Myklebust07737692007-10-25 18:42:54 -04001461 struct rpc_task *task;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001462 int priority = flush_task_priority(how);
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001463 struct rpc_message msg = {
1464 .rpc_argp = &data->args,
1465 .rpc_resp = &data->res,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001466 .rpc_cred = data->cred,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001467 };
Trond Myklebust84115e12007-07-14 15:39:59 -04001468 struct rpc_task_setup task_setup_data = {
Trond Myklebust07737692007-10-25 18:42:54 -04001469 .task = &data->task,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001470 .rpc_client = clnt,
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001471 .rpc_message = &msg,
Fred Isaman9ace33c2011-03-23 13:27:45 +00001472 .callback_ops = call_ops,
Trond Myklebust84115e12007-07-14 15:39:59 -04001473 .callback_data = data,
Trond Myklebust101070c2008-02-19 20:04:23 -05001474 .workqueue = nfsiod_workqueue,
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001475 .flags = RPC_TASK_ASYNC | flags,
Trond Myklebust3ff75762007-07-14 15:40:00 -04001476 .priority = priority,
Trond Myklebust84115e12007-07-14 15:39:59 -04001477 };
Trond Myklebust788e7a82006-03-20 13:44:27 -05001478 /* Set up the initial task struct. */
Fred Isaman9ace33c2011-03-23 13:27:45 +00001479 NFS_PROTO(data->inode)->commit_setup(data, &msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480
Chuck Levera3f565b2007-01-31 12:14:01 -05001481 dprintk("NFS: %5u initiated commit call\n", data->task.tk_pid);
Trond Myklebustbdc7f022007-07-14 15:40:00 -04001482
Weston Andros Adamson8c21c622013-08-13 16:37:37 -04001483 nfs4_state_protect(NFS_SERVER(data->inode)->nfs_client,
1484 NFS_SP4_MACH_CRED_COMMIT, &task_setup_data.rpc_client, &msg);
1485
Trond Myklebust07737692007-10-25 18:42:54 -04001486 task = rpc_run_task(&task_setup_data);
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001487 if (IS_ERR(task))
1488 return PTR_ERR(task);
Jeff Laytond2224e72011-03-06 17:14:13 +00001489 if (how & FLUSH_SYNC)
1490 rpc_wait_for_completion_task(task);
Trond Myklebustdbae4c72008-04-14 14:54:53 -04001491 rpc_put_task(task);
1492 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493}
Fred Isamane0c2b382011-03-23 13:27:53 +00001494EXPORT_SYMBOL_GPL(nfs_initiate_commit);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495
Peng Tao378520b2014-08-07 10:15:02 +08001496static loff_t nfs_get_lwb(struct list_head *head)
1497{
1498 loff_t lwb = 0;
1499 struct nfs_page *req;
1500
1501 list_for_each_entry(req, head, wb_list)
1502 if (lwb < (req_offset(req) + req->wb_bytes))
1503 lwb = req_offset(req) + req->wb_bytes;
1504
1505 return lwb;
1506}
1507
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508/*
Fred Isaman9ace33c2011-03-23 13:27:45 +00001509 * Set up the argument/result storage required for the RPC call.
1510 */
Fred Isaman0b7c0152012-04-20 14:47:39 -04001511void nfs_init_commit(struct nfs_commit_data *data,
Fred Isamanf453a542012-04-20 14:47:54 -04001512 struct list_head *head,
1513 struct pnfs_layout_segment *lseg,
1514 struct nfs_commit_info *cinfo)
Fred Isaman9ace33c2011-03-23 13:27:45 +00001515{
1516 struct nfs_page *first = nfs_list_entry(head->next);
Al Viro3d4ff432011-06-22 18:40:12 -04001517 struct inode *inode = first->wb_context->dentry->d_inode;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001518
1519 /* Set up the RPC argument and reply structs
1520 * NB: take care not to mess about with data->commit et al. */
1521
1522 list_splice_init(head, &data->pages);
1523
1524 data->inode = inode;
1525 data->cred = first->wb_context->cred;
Fred Isaman988b6dc2011-03-23 13:27:52 +00001526 data->lseg = lseg; /* reference transferred */
Peng Tao378520b2014-08-07 10:15:02 +08001527 /* only set lwb for pnfs commit */
1528 if (lseg)
1529 data->lwb = nfs_get_lwb(&data->pages);
Fred Isaman9ace33c2011-03-23 13:27:45 +00001530 data->mds_ops = &nfs_commit_ops;
Fred Isamanf453a542012-04-20 14:47:54 -04001531 data->completion_ops = cinfo->completion_ops;
Fred Isamanb359f9d2012-04-20 14:47:55 -04001532 data->dreq = cinfo->dreq;
Fred Isaman9ace33c2011-03-23 13:27:45 +00001533
1534 data->args.fh = NFS_FH(data->inode);
1535 /* Note: we always request a commit of the entire inode */
1536 data->args.offset = 0;
1537 data->args.count = 0;
Fred Isaman0b7c0152012-04-20 14:47:39 -04001538 data->context = get_nfs_open_context(first->wb_context);
Fred Isaman9ace33c2011-03-23 13:27:45 +00001539 data->res.fattr = &data->fattr;
1540 data->res.verf = &data->verf;
1541 nfs_fattr_init(&data->fattr);
1542}
Fred Isamane0c2b382011-03-23 13:27:53 +00001543EXPORT_SYMBOL_GPL(nfs_init_commit);
Fred Isaman9ace33c2011-03-23 13:27:45 +00001544
Fred Isamane0c2b382011-03-23 13:27:53 +00001545void nfs_retry_commit(struct list_head *page_list,
Fred Isamanea2cf222012-04-20 14:47:53 -04001546 struct pnfs_layout_segment *lseg,
1547 struct nfs_commit_info *cinfo)
Fred Isaman64bfeb42011-03-23 13:27:47 +00001548{
1549 struct nfs_page *req;
1550
1551 while (!list_empty(page_list)) {
1552 req = nfs_list_entry(page_list->next);
1553 nfs_list_remove_request(req);
Fred Isamanea2cf222012-04-20 14:47:53 -04001554 nfs_mark_request_commit(req, lseg, cinfo);
Fred Isaman56f9cd62012-04-20 14:47:56 -04001555 if (!cinfo->dreq) {
1556 dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
Mel Gormand56b4dd2012-07-31 16:45:06 -07001557 dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
Fred Isaman56f9cd62012-04-20 14:47:56 -04001558 BDI_RECLAIMABLE);
1559 }
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001560 nfs_unlock_and_release_request(req);
Fred Isaman64bfeb42011-03-23 13:27:47 +00001561 }
1562}
Fred Isamane0c2b382011-03-23 13:27:53 +00001563EXPORT_SYMBOL_GPL(nfs_retry_commit);
Fred Isaman64bfeb42011-03-23 13:27:47 +00001564
Fred Isaman9ace33c2011-03-23 13:27:45 +00001565/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001566 * Commit dirty pages
1567 */
1568static int
Fred Isamanea2cf222012-04-20 14:47:53 -04001569nfs_commit_list(struct inode *inode, struct list_head *head, int how,
1570 struct nfs_commit_info *cinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001571{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001572 struct nfs_commit_data *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001574 data = nfs_commitdata_alloc();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575
1576 if (!data)
1577 goto out_bad;
1578
1579 /* Set up the argument struct */
Fred Isamanf453a542012-04-20 14:47:54 -04001580 nfs_init_commit(data, head, NULL, cinfo);
1581 atomic_inc(&cinfo->mds->rpcs_out);
Andy Adamson9f0ec1762012-04-27 17:53:44 -04001582 return nfs_initiate_commit(NFS_CLIENT(inode), data, data->mds_ops,
1583 how, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584 out_bad:
Fred Isamanea2cf222012-04-20 14:47:53 -04001585 nfs_retry_commit(head, NULL, cinfo);
Fred Isamanf453a542012-04-20 14:47:54 -04001586 cinfo->completion_ops->error_cleanup(NFS_I(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001587 return -ENOMEM;
1588}
1589
1590/*
1591 * COMMIT call returned
1592 */
Trond Myklebust788e7a82006-03-20 13:44:27 -05001593static void nfs_commit_done(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001595 struct nfs_commit_data *data = calldata;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001596
Chuck Levera3f565b2007-01-31 12:14:01 -05001597 dprintk("NFS: %5u nfs_commit_done (status %d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 task->tk_pid, task->tk_status);
1599
Trond Myklebust788e7a82006-03-20 13:44:27 -05001600 /* Call the NFS version-specific code */
Trond Myklebustc0d0e962011-04-12 12:29:15 -04001601 NFS_PROTO(data->inode)->commit_done(task, data);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001602}
1603
Fred Isamanf453a542012-04-20 14:47:54 -04001604static void nfs_commit_release_pages(struct nfs_commit_data *data)
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001605{
Fred Isaman5917ce82011-03-23 13:27:48 +00001606 struct nfs_page *req;
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001607 int status = data->task.tk_status;
Fred Isamanf453a542012-04-20 14:47:54 -04001608 struct nfs_commit_info cinfo;
Trond Myklebust788e7a82006-03-20 13:44:27 -05001609
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610 while (!list_empty(&data->pages)) {
1611 req = nfs_list_entry(data->pages.next);
1612 nfs_list_remove_request(req);
Fred Isamand6d6dc72012-03-08 17:29:35 -05001613 nfs_clear_page_commit(req->wb_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614
Niels de Vos1e8968c2013-12-17 18:20:16 +01001615 dprintk("NFS: commit (%s/%llu %d@%lld)",
Al Viro3d4ff432011-06-22 18:40:12 -04001616 req->wb_context->dentry->d_sb->s_id,
Niels de Vos1e8968c2013-12-17 18:20:16 +01001617 (unsigned long long)NFS_FILEID(req->wb_context->dentry->d_inode),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 req->wb_bytes,
1619 (long long)req_offset(req));
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001620 if (status < 0) {
1621 nfs_context_set_write_error(req->wb_context, status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001622 nfs_inode_remove_request(req);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001623 dprintk(", error = %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001624 goto next;
1625 }
1626
1627 /* Okay, COMMIT succeeded, apparently. Check the verifier
1628 * returned by the server against all stored verfs. */
Trond Myklebust2f2c63b2012-06-08 11:56:09 -04001629 if (!memcmp(&req->wb_verf, &data->verf.verifier, sizeof(req->wb_verf))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 /* We have a match */
1631 nfs_inode_remove_request(req);
1632 dprintk(" OK\n");
1633 goto next;
1634 }
1635 /* We have a mismatch. Write the page again */
1636 dprintk(" mismatch\n");
Fred6d884e82008-03-19 11:24:38 -04001637 nfs_mark_request_dirty(req);
Trond Myklebust05990d12012-09-11 16:01:22 -04001638 set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 next:
Trond Myklebust1d1afcb2012-05-09 14:04:55 -04001640 nfs_unlock_and_release_request(req);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641 }
Fred Isamanf453a542012-04-20 14:47:54 -04001642 nfs_init_cinfo(&cinfo, data->inode, data->dreq);
1643 if (atomic_dec_and_test(&cinfo.mds->rpcs_out))
1644 nfs_commit_clear_lock(NFS_I(data->inode));
Fred Isaman5917ce82011-03-23 13:27:48 +00001645}
1646
1647static void nfs_commit_release(void *calldata)
1648{
Fred Isaman0b7c0152012-04-20 14:47:39 -04001649 struct nfs_commit_data *data = calldata;
Fred Isaman5917ce82011-03-23 13:27:48 +00001650
Fred Isamanf453a542012-04-20 14:47:54 -04001651 data->completion_ops->completion(data);
Trond Myklebustc9d8f892008-04-15 16:56:39 -04001652 nfs_commitdata_release(calldata);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653}
Trond Myklebust788e7a82006-03-20 13:44:27 -05001654
1655static const struct rpc_call_ops nfs_commit_ops = {
Fred Isaman0b7c0152012-04-20 14:47:39 -04001656 .rpc_call_prepare = nfs_commit_prepare,
Trond Myklebust788e7a82006-03-20 13:44:27 -05001657 .rpc_call_done = nfs_commit_done,
1658 .rpc_release = nfs_commit_release,
1659};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660
Fred Isamanf453a542012-04-20 14:47:54 -04001661static const struct nfs_commit_completion_ops nfs_commit_completion_ops = {
1662 .completion = nfs_commit_release_pages,
1663 .error_cleanup = nfs_commit_clear_lock,
1664};
1665
Fred Isaman1763da12012-04-20 14:47:57 -04001666int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
1667 int how, struct nfs_commit_info *cinfo)
Fred Isaman84c53ab2012-04-20 14:47:52 -04001668{
1669 int status;
1670
Fred Isamanea2cf222012-04-20 14:47:53 -04001671 status = pnfs_commit_list(inode, head, how, cinfo);
Fred Isaman84c53ab2012-04-20 14:47:52 -04001672 if (status == PNFS_NOT_ATTEMPTED)
Fred Isamanea2cf222012-04-20 14:47:53 -04001673 status = nfs_commit_list(inode, head, how, cinfo);
Fred Isaman84c53ab2012-04-20 14:47:52 -04001674 return status;
1675}
1676
Trond Myklebustb608b282010-07-30 15:31:54 -04001677int nfs_commit_inode(struct inode *inode, int how)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001678{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 LIST_HEAD(head);
Fred Isamanea2cf222012-04-20 14:47:53 -04001680 struct nfs_commit_info cinfo;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001681 int may_wait = how & FLUSH_SYNC;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001682 int res;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683
Trond Myklebustb8413f92011-03-21 15:37:01 -04001684 res = nfs_commit_set_lock(NFS_I(inode), may_wait);
1685 if (res <= 0)
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001686 goto out_mark_dirty;
Fred Isamanea2cf222012-04-20 14:47:53 -04001687 nfs_init_cinfo_from_inode(&cinfo, inode);
1688 res = nfs_scan_commit(inode, &head, &cinfo);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689 if (res) {
Fred Isamana861a1e2011-03-23 13:27:51 +00001690 int error;
1691
Fred Isamanea2cf222012-04-20 14:47:53 -04001692 error = nfs_generic_commit_list(inode, &head, how, &cinfo);
Trond Myklebust3da28eb2005-06-22 17:16:31 +00001693 if (error < 0)
1694 return error;
Trond Myklebustb8413f92011-03-21 15:37:01 -04001695 if (!may_wait)
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001696 goto out_mark_dirty;
NeilBrown74316202014-07-07 15:16:04 +10001697 error = wait_on_bit_action(&NFS_I(inode)->flags,
Trond Myklebustb8413f92011-03-21 15:37:01 -04001698 NFS_INO_COMMIT,
1699 nfs_wait_bit_killable,
1700 TASK_KILLABLE);
1701 if (error < 0)
1702 return error;
Trond Myklebust71d0a612010-04-22 15:35:57 -04001703 } else
1704 nfs_commit_clear_lock(NFS_I(inode));
Trond Myklebustc5efa5f2010-05-26 08:42:11 -04001705 return res;
1706 /* Note: If we exit without ensuring that the commit is complete,
1707 * we must mark the inode as dirty. Otherwise, future calls to
1708 * sync_inode() with the WB_SYNC_ALL flag set will fail to ensure
1709 * that the data is on the disk.
1710 */
1711out_mark_dirty:
1712 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 return res;
1714}
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001715
1716static int nfs_commit_unstable_pages(struct inode *inode, struct writeback_control *wbc)
1717{
Trond Myklebust420e3642010-02-19 17:00:02 -08001718 struct nfs_inode *nfsi = NFS_I(inode);
1719 int flags = FLUSH_SYNC;
1720 int ret = 0;
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001721
Jeff Layton3236c3e12011-10-11 09:49:21 -04001722 /* no commits means nothing needs to be done */
Fred Isamanea2cf222012-04-20 14:47:53 -04001723 if (!nfsi->commit_info.ncommit)
Jeff Layton3236c3e12011-10-11 09:49:21 -04001724 return ret;
1725
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001726 if (wbc->sync_mode == WB_SYNC_NONE) {
1727 /* Don't commit yet if this is a non-blocking flush and there
1728 * are a lot of outstanding writes for this mapping.
1729 */
Fred Isamanea2cf222012-04-20 14:47:53 -04001730 if (nfsi->commit_info.ncommit <= (nfsi->npages >> 1))
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001731 goto out_mark_dirty;
Trond Myklebust420e3642010-02-19 17:00:02 -08001732
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001733 /* don't wait for the COMMIT response */
Trond Myklebust420e3642010-02-19 17:00:02 -08001734 flags = 0;
Jeff Laytona00dd6c2010-09-28 09:14:01 -04001735 }
1736
Trond Myklebust420e3642010-02-19 17:00:02 -08001737 ret = nfs_commit_inode(inode, flags);
1738 if (ret >= 0) {
1739 if (wbc->sync_mode == WB_SYNC_NONE) {
1740 if (ret < wbc->nr_to_write)
1741 wbc->nr_to_write -= ret;
1742 else
1743 wbc->nr_to_write = 0;
1744 }
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001745 return 0;
Trond Myklebust420e3642010-02-19 17:00:02 -08001746 }
1747out_mark_dirty:
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001748 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
1749 return ret;
1750}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751
Trond Myklebust8fc795f2010-02-19 16:46:56 -08001752int nfs_write_inode(struct inode *inode, struct writeback_control *wbc)
1753{
Bryan Schumakera8d8f022012-06-20 15:53:49 -04001754 return nfs_commit_unstable_pages(inode, wbc);
1755}
Bryan Schumaker89d77c82012-07-30 16:05:25 -04001756EXPORT_SYMBOL_GPL(nfs_write_inode);
Andy Adamson863a3c62011-03-23 13:27:54 +00001757
Trond Myklebustacdc53b2010-02-19 17:03:26 -08001758/*
1759 * flush the inode to disk.
1760 */
1761int nfs_wb_all(struct inode *inode)
Trond Myklebust34901f72007-07-25 14:09:54 -04001762{
1763 struct writeback_control wbc = {
Trond Myklebust72cb77f2009-03-11 14:10:30 -04001764 .sync_mode = WB_SYNC_ALL,
Trond Myklebust34901f72007-07-25 14:09:54 -04001765 .nr_to_write = LONG_MAX,
Trond Myklebustd7fb1202008-10-06 20:08:56 -04001766 .range_start = 0,
1767 .range_end = LLONG_MAX,
Trond Myklebust34901f72007-07-25 14:09:54 -04001768 };
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001769 int ret;
Trond Myklebust34901f72007-07-25 14:09:54 -04001770
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001771 trace_nfs_writeback_inode_enter(inode);
1772
1773 ret = sync_inode(inode, &wbc);
1774
1775 trace_nfs_writeback_inode_exit(inode, ret);
1776 return ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001777}
Bryan Schumakerddda8e02012-07-30 16:05:23 -04001778EXPORT_SYMBOL_GPL(nfs_wb_all);
Trond Myklebust1c759502006-10-09 16:18:38 -04001779
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001780int nfs_wb_page_cancel(struct inode *inode, struct page *page)
1781{
1782 struct nfs_page *req;
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001783 int ret = 0;
1784
Weston Andros Adamson3e217042014-07-11 10:20:49 -04001785 wait_on_page_writeback(page);
1786
1787 /* blocking call to cancel all requests and join to a single (head)
1788 * request */
1789 req = nfs_lock_and_join_requests(page, false);
1790
1791 if (IS_ERR(req)) {
1792 ret = PTR_ERR(req);
1793 } else if (req) {
1794 /* all requests from this page have been cancelled by
1795 * nfs_lock_and_join_requests, so just remove the head
1796 * request from the inode / page_private pointer and
1797 * release it */
1798 nfs_inode_remove_request(req);
1799 /*
1800 * In case nfs_inode_remove_request has marked the
1801 * page as being dirty
1802 */
1803 cancel_dirty_page(page, PAGE_CACHE_SIZE);
1804 nfs_unlock_and_release_request(req);
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001805 }
Weston Andros Adamson3e217042014-07-11 10:20:49 -04001806
Trond Myklebust1b3b4a12007-08-28 10:29:36 -04001807 return ret;
1808}
1809
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001810/*
1811 * Write back all requests on one page - we do this before reading it.
1812 */
1813int nfs_wb_page(struct inode *inode, struct page *page)
Trond Myklebust1c759502006-10-09 16:18:38 -04001814{
Mel Gorman29418aa2012-07-31 16:45:10 -07001815 loff_t range_start = page_file_offset(page);
Trond Myklebust1c759502006-10-09 16:18:38 -04001816 loff_t range_end = range_start + (loff_t)(PAGE_CACHE_SIZE - 1);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001817 struct writeback_control wbc = {
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001818 .sync_mode = WB_SYNC_ALL,
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001819 .nr_to_write = 0,
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001820 .range_start = range_start,
1821 .range_end = range_end,
1822 };
1823 int ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001824
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001825 trace_nfs_writeback_page_enter(inode);
1826
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001827 for (;;) {
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001828 wait_on_page_writeback(page);
Trond Myklebust73e33022008-04-11 16:03:54 -04001829 if (clear_page_dirty_for_io(page)) {
1830 ret = nfs_writepage_locked(page, &wbc);
1831 if (ret < 0)
1832 goto out_error;
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001833 continue;
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001834 }
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001835 ret = 0;
Trond Myklebust0522f6a2010-05-26 08:42:24 -04001836 if (!PagePrivate(page))
1837 break;
1838 ret = nfs_commit_inode(inode, FLUSH_SYNC);
Trond Myklebustba8b06e2010-04-27 18:33:54 -04001839 if (ret < 0)
Trond Myklebust73e33022008-04-11 16:03:54 -04001840 goto out_error;
Trond Myklebust7f2f12d2010-02-19 17:03:28 -08001841 }
Trond Myklebust73e33022008-04-11 16:03:54 -04001842out_error:
Trond Myklebustf4ce1292013-08-19 18:59:33 -04001843 trace_nfs_writeback_page_exit(inode, ret);
Trond Myklebust4d770cc2006-12-05 00:35:41 -05001844 return ret;
Trond Myklebust1c759502006-10-09 16:18:38 -04001845}
1846
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001847#ifdef CONFIG_MIGRATION
1848int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
Mel Gormana6bc32b2012-01-12 17:19:43 -08001849 struct page *page, enum migrate_mode mode)
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001850{
Jeff Layton2da95652011-10-12 10:57:42 -04001851 /*
1852 * If PagePrivate is set, then the page is currently associated with
1853 * an in-progress read or write request. Don't try to migrate it.
1854 *
1855 * FIXME: we could do this in principle, but we'll need a way to ensure
1856 * that we can safely release the inode reference while holding
1857 * the page lock.
1858 */
1859 if (PagePrivate(page))
1860 return -EBUSY;
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001861
David Howells8c209ce2012-12-05 13:34:49 +00001862 if (!nfs_fscache_release_page(page, GFP_KERNEL))
1863 return -EBUSY;
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001864
Mel Gormana6bc32b2012-01-12 17:19:43 -08001865 return migrate_page(mapping, newpage, page, mode);
Trond Myklebust074cc1d2009-08-10 08:54:13 -04001866}
1867#endif
1868
David Howellsf7b422b2006-06-09 09:34:33 -04001869int __init nfs_init_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001870{
1871 nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
Weston Andros Adamson1e7f3a42014-06-09 11:48:33 -04001872 sizeof(struct nfs_pgio_header),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 0, SLAB_HWCACHE_ALIGN,
Paul Mundt20c2df82007-07-20 10:11:58 +09001874 NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001875 if (nfs_wdata_cachep == NULL)
1876 return -ENOMEM;
1877
Matthew Dobson93d23412006-03-26 01:37:50 -08001878 nfs_wdata_mempool = mempool_create_slab_pool(MIN_POOL_WRITE,
1879 nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 if (nfs_wdata_mempool == NULL)
Jeff Layton3dd47652012-08-02 14:30:56 -04001881 goto out_destroy_write_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001882
Fred Isaman0b7c0152012-04-20 14:47:39 -04001883 nfs_cdata_cachep = kmem_cache_create("nfs_commit_data",
1884 sizeof(struct nfs_commit_data),
1885 0, SLAB_HWCACHE_ALIGN,
1886 NULL);
1887 if (nfs_cdata_cachep == NULL)
Jeff Layton3dd47652012-08-02 14:30:56 -04001888 goto out_destroy_write_mempool;
Fred Isaman0b7c0152012-04-20 14:47:39 -04001889
Matthew Dobson93d23412006-03-26 01:37:50 -08001890 nfs_commit_mempool = mempool_create_slab_pool(MIN_POOL_COMMIT,
Yanchuan Nian4c100212012-11-12 09:27:37 +08001891 nfs_cdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 if (nfs_commit_mempool == NULL)
Jeff Layton3dd47652012-08-02 14:30:56 -04001893 goto out_destroy_commit_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894
Peter Zijlstra89a09142007-03-16 13:38:26 -08001895 /*
1896 * NFS congestion size, scale with available memory.
1897 *
1898 * 64MB: 8192k
1899 * 128MB: 11585k
1900 * 256MB: 16384k
1901 * 512MB: 23170k
1902 * 1GB: 32768k
1903 * 2GB: 46340k
1904 * 4GB: 65536k
1905 * 8GB: 92681k
1906 * 16GB: 131072k
1907 *
1908 * This allows larger machines to have larger/more transfers.
1909 * Limit the default to 256M
1910 */
1911 nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10);
1912 if (nfs_congestion_kb > 256*1024)
1913 nfs_congestion_kb = 256*1024;
1914
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 return 0;
Jeff Layton3dd47652012-08-02 14:30:56 -04001916
1917out_destroy_commit_cache:
1918 kmem_cache_destroy(nfs_cdata_cachep);
1919out_destroy_write_mempool:
1920 mempool_destroy(nfs_wdata_mempool);
1921out_destroy_write_cache:
1922 kmem_cache_destroy(nfs_wdata_cachep);
1923 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924}
1925
David Brownell266bee82006-06-27 12:59:15 -07001926void nfs_destroy_writepagecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927{
1928 mempool_destroy(nfs_commit_mempool);
Jeff Layton3dd47652012-08-02 14:30:56 -04001929 kmem_cache_destroy(nfs_cdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 mempool_destroy(nfs_wdata_mempool);
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -07001931 kmem_cache_destroy(nfs_wdata_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932}
1933
Anna Schumaker4a0de552014-05-06 09:12:30 -04001934static const struct nfs_rw_ops nfs_rw_write_ops = {
Anna Schumakera4cdda52014-05-06 09:12:31 -04001935 .rw_mode = FMODE_WRITE,
Anna Schumaker4a0de552014-05-06 09:12:30 -04001936 .rw_alloc_header = nfs_writehdr_alloc,
1937 .rw_free_header = nfs_writehdr_free,
Anna Schumakera4cdda52014-05-06 09:12:31 -04001938 .rw_release = nfs_writeback_release_common,
Anna Schumaker0eecb212014-05-06 09:12:32 -04001939 .rw_done = nfs_writeback_done,
1940 .rw_result = nfs_writeback_result,
Anna Schumaker1ed26f32014-05-06 09:12:37 -04001941 .rw_initiate = nfs_initiate_write,
Anna Schumaker4a0de552014-05-06 09:12:30 -04001942};