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CommitLineData
1da177e4
LT
1/*
2 * linux/fs/nfs/file.c
3 *
4 * Copyright (C) 1992 Rick Sladkey
5 *
6 * Changes Copyright (C) 1994 by Florian La Roche
7 * - Do not copy data too often around in the kernel.
8 * - In nfs_file_read the return value of kmalloc wasn't checked.
9 * - Put in a better version of read look-ahead buffering. Original idea
10 * and implementation by Wai S Kok elekokws@ee.nus.sg.
11 *
12 * Expire cache on write to a file by Wai S Kok (Oct 1994).
13 *
14 * Total rewrite of read side for new NFS buffer cache.. Linus.
15 *
16 * nfs regular file handling functions
17 */
18
19#include <linux/time.h>
20#include <linux/kernel.h>
21#include <linux/errno.h>
22#include <linux/fcntl.h>
23#include <linux/stat.h>
24#include <linux/nfs_fs.h>
25#include <linux/nfs_mount.h>
26#include <linux/mm.h>
1da177e4 27#include <linux/pagemap.h>
e8edc6e0 28#include <linux/aio.h>
5a0e3ad6 29#include <linux/gfp.h>
b608b283 30#include <linux/swap.h>
1da177e4
LT
31
32#include <asm/uaccess.h>
33#include <asm/system.h>
34
35#include "delegation.h"
94387fb1 36#include "internal.h"
91d5b470 37#include "iostat.h"
545db45f 38#include "fscache.h"
e5e94017 39#include "pnfs.h"
1da177e4
LT
40
41#define NFSDBG_FACILITY NFSDBG_FILE
42
43static int nfs_file_open(struct inode *, struct file *);
44static int nfs_file_release(struct inode *, struct file *);
980802e3 45static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin);
1da177e4 46static int nfs_file_mmap(struct file *, struct vm_area_struct *);
f0930fff
JA
47static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos,
48 struct pipe_inode_info *pipe,
49 size_t count, unsigned int flags);
027445c3
BP
50static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov,
51 unsigned long nr_segs, loff_t pos);
bf40d343
SJ
52static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
53 struct file *filp, loff_t *ppos,
54 size_t count, unsigned int flags);
027445c3
BP
55static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov,
56 unsigned long nr_segs, loff_t pos);
75e1fcc0 57static int nfs_file_flush(struct file *, fl_owner_t id);
7ea80859 58static int nfs_file_fsync(struct file *, int datasync);
1da177e4
LT
59static int nfs_check_flags(int flags);
60static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
61static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
370f6599 62static int nfs_setlease(struct file *file, long arg, struct file_lock **fl);
1da177e4 63
f0f37e2f 64static const struct vm_operations_struct nfs_file_vm_ops;
94387fb1 65
4b6f5d20 66const struct file_operations nfs_file_operations = {
980802e3 67 .llseek = nfs_file_llseek,
1da177e4
LT
68 .read = do_sync_read,
69 .write = do_sync_write,
027445c3
BP
70 .aio_read = nfs_file_read,
71 .aio_write = nfs_file_write,
1da177e4
LT
72 .mmap = nfs_file_mmap,
73 .open = nfs_file_open,
74 .flush = nfs_file_flush,
75 .release = nfs_file_release,
54917786 76 .fsync = nfs_file_fsync,
1da177e4
LT
77 .lock = nfs_lock,
78 .flock = nfs_flock,
f0930fff 79 .splice_read = nfs_file_splice_read,
bf40d343 80 .splice_write = nfs_file_splice_write,
1da177e4 81 .check_flags = nfs_check_flags,
370f6599 82 .setlease = nfs_setlease,
1da177e4
LT
83};
84
92e1d5be 85const struct inode_operations nfs_file_inode_operations = {
1da177e4
LT
86 .permission = nfs_permission,
87 .getattr = nfs_getattr,
88 .setattr = nfs_setattr,
89};
90
b7fa0554 91#ifdef CONFIG_NFS_V3
92e1d5be 92const struct inode_operations nfs3_file_inode_operations = {
b7fa0554
AG
93 .permission = nfs_permission,
94 .getattr = nfs_getattr,
95 .setattr = nfs_setattr,
96 .listxattr = nfs3_listxattr,
97 .getxattr = nfs3_getxattr,
98 .setxattr = nfs3_setxattr,
99 .removexattr = nfs3_removexattr,
100};
101#endif /* CONFIG_NFS_v3 */
102
1da177e4
LT
103/* Hack for future NFS swap support */
104#ifndef IS_SWAPFILE
105# define IS_SWAPFILE(inode) (0)
106#endif
107
108static int nfs_check_flags(int flags)
109{
110 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
111 return -EINVAL;
112
113 return 0;
114}
115
116/*
117 * Open file
118 */
119static int
120nfs_file_open(struct inode *inode, struct file *filp)
121{
1da177e4
LT
122 int res;
123
6da24bc9 124 dprintk("NFS: open file(%s/%s)\n",
cc0dd2d1
CL
125 filp->f_path.dentry->d_parent->d_name.name,
126 filp->f_path.dentry->d_name.name);
127
c2459dc4 128 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
1da177e4
LT
129 res = nfs_check_flags(filp->f_flags);
130 if (res)
131 return res;
132
46cb650c 133 res = nfs_open(inode, filp);
1da177e4
LT
134 return res;
135}
136
137static int
138nfs_file_release(struct inode *inode, struct file *filp)
139{
6da24bc9
CL
140 struct dentry *dentry = filp->f_path.dentry;
141
142 dprintk("NFS: release(%s/%s)\n",
143 dentry->d_parent->d_name.name,
144 dentry->d_name.name);
145
91d5b470 146 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
46cb650c 147 return nfs_release(inode, filp);
1da177e4
LT
148}
149
980802e3
TM
150/**
151 * nfs_revalidate_size - Revalidate the file size
152 * @inode - pointer to inode struct
153 * @file - pointer to struct file
154 *
155 * Revalidates the file length. This is basically a wrapper around
156 * nfs_revalidate_inode() that takes into account the fact that we may
157 * have cached writes (in which case we don't care about the server's
158 * idea of what the file length is), or O_DIRECT (in which case we
159 * shouldn't trust the cache).
160 */
161static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
162{
163 struct nfs_server *server = NFS_SERVER(inode);
164 struct nfs_inode *nfsi = NFS_I(inode);
165
d7cf8dd0
TM
166 if (nfs_have_delegated_attributes(inode))
167 goto out_noreval;
168
980802e3
TM
169 if (filp->f_flags & O_DIRECT)
170 goto force_reval;
d7cf8dd0
TM
171 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
172 goto force_reval;
173 if (nfs_attribute_timeout(inode))
174 goto force_reval;
175out_noreval:
176 return 0;
980802e3
TM
177force_reval:
178 return __nfs_revalidate_inode(server, inode);
179}
180
181static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
182{
9465efc9 183 loff_t loff;
e89e896d 184
6da24bc9 185 dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
b84e06c5
CL
186 filp->f_path.dentry->d_parent->d_name.name,
187 filp->f_path.dentry->d_name.name,
188 offset, origin);
189
980802e3 190 /* origin == SEEK_END => we must revalidate the cached file length */
aec5e175 191 if (origin == SEEK_END) {
980802e3 192 struct inode *inode = filp->f_mapping->host;
d5e66348 193
980802e3
TM
194 int retval = nfs_revalidate_file_size(inode, filp);
195 if (retval < 0)
196 return (loff_t)retval;
d5e66348
TM
197
198 spin_lock(&inode->i_lock);
199 loff = generic_file_llseek_unlocked(filp, offset, origin);
200 spin_unlock(&inode->i_lock);
201 } else
202 loff = generic_file_llseek_unlocked(filp, offset, origin);
9465efc9 203 return loff;
980802e3
TM
204}
205
1da177e4
LT
206/*
207 * Flush all dirty pages, and check for write errors.
1da177e4
LT
208 */
209static int
75e1fcc0 210nfs_file_flush(struct file *file, fl_owner_t id)
1da177e4 211{
6da24bc9
CL
212 struct dentry *dentry = file->f_path.dentry;
213 struct inode *inode = dentry->d_inode;
1da177e4 214
6da24bc9
CL
215 dprintk("NFS: flush(%s/%s)\n",
216 dentry->d_parent->d_name.name,
217 dentry->d_name.name);
1da177e4 218
c2459dc4 219 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
1da177e4
LT
220 if ((file->f_mode & FMODE_WRITE) == 0)
221 return 0;
7b159fc1 222
7fe5c398 223 /* Flush writes to the server and return any errors */
af7fa165 224 return vfs_fsync(file, 0);
1da177e4
LT
225}
226
227static ssize_t
027445c3
BP
228nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
229 unsigned long nr_segs, loff_t pos)
1da177e4 230{
01cce933 231 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
1da177e4
LT
232 struct inode * inode = dentry->d_inode;
233 ssize_t result;
027445c3 234 size_t count = iov_length(iov, nr_segs);
1da177e4 235
1da177e4 236 if (iocb->ki_filp->f_flags & O_DIRECT)
027445c3 237 return nfs_file_direct_read(iocb, iov, nr_segs, pos);
1da177e4 238
6da24bc9 239 dprintk("NFS: read(%s/%s, %lu@%lu)\n",
1da177e4
LT
240 dentry->d_parent->d_name.name, dentry->d_name.name,
241 (unsigned long) count, (unsigned long) pos);
242
44b11874 243 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
4184dcf2 244 if (!result) {
027445c3 245 result = generic_file_aio_read(iocb, iov, nr_segs, pos);
4184dcf2
CL
246 if (result > 0)
247 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
248 }
1da177e4
LT
249 return result;
250}
251
252static ssize_t
f0930fff
JA
253nfs_file_splice_read(struct file *filp, loff_t *ppos,
254 struct pipe_inode_info *pipe, size_t count,
255 unsigned int flags)
1da177e4 256{
01cce933 257 struct dentry *dentry = filp->f_path.dentry;
1da177e4
LT
258 struct inode *inode = dentry->d_inode;
259 ssize_t res;
260
6da24bc9 261 dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
1da177e4
LT
262 dentry->d_parent->d_name.name, dentry->d_name.name,
263 (unsigned long) count, (unsigned long long) *ppos);
264
44b11874 265 res = nfs_revalidate_mapping(inode, filp->f_mapping);
aa2f1ef1 266 if (!res) {
f0930fff 267 res = generic_file_splice_read(filp, ppos, pipe, count, flags);
aa2f1ef1
CL
268 if (res > 0)
269 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
270 }
1da177e4
LT
271 return res;
272}
273
274static int
275nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
276{
01cce933 277 struct dentry *dentry = file->f_path.dentry;
1da177e4
LT
278 struct inode *inode = dentry->d_inode;
279 int status;
280
6da24bc9 281 dprintk("NFS: mmap(%s/%s)\n",
1da177e4
LT
282 dentry->d_parent->d_name.name, dentry->d_name.name);
283
e1ebfd33
TM
284 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
285 * so we call that before revalidating the mapping
286 */
287 status = generic_file_mmap(file, vma);
94387fb1
TM
288 if (!status) {
289 vma->vm_ops = &nfs_file_vm_ops;
e1ebfd33 290 status = nfs_revalidate_mapping(inode, file->f_mapping);
94387fb1 291 }
1da177e4
LT
292 return status;
293}
294
295/*
296 * Flush any dirty pages for this process, and check for write errors.
297 * The return status from this call provides a reliable indication of
298 * whether any write errors occurred for this process.
af7fa165
TM
299 *
300 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
301 * disk, but it retrieves and clears ctx->error after synching, despite
302 * the two being set at the same time in nfs_context_set_write_error().
303 * This is because the former is used to notify the _next_ call to
304 * nfs_file_write() that a write error occured, and hence cause it to
305 * fall back to doing a synchronous write.
1da177e4
LT
306 */
307static int
7ea80859 308nfs_file_fsync(struct file *file, int datasync)
1da177e4 309{
7ea80859 310 struct dentry *dentry = file->f_path.dentry;
cd3758e3 311 struct nfs_open_context *ctx = nfs_file_open_context(file);
1da177e4 312 struct inode *inode = dentry->d_inode;
af7fa165
TM
313 int have_error, status;
314 int ret = 0;
315
1da177e4 316
6da24bc9 317 dprintk("NFS: fsync file(%s/%s) datasync %d\n",
54917786
CL
318 dentry->d_parent->d_name.name, dentry->d_name.name,
319 datasync);
1da177e4 320
91d5b470 321 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
af7fa165
TM
322 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
323 status = nfs_commit_inode(inode, FLUSH_SYNC);
324 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
325 if (have_error)
326 ret = xchg(&ctx->error, 0);
0702099b 327 if (!ret && status < 0)
af7fa165
TM
328 ret = status;
329 return ret;
1da177e4
LT
330}
331
38c73044
PS
332/*
333 * Decide whether a read/modify/write cycle may be more efficient
334 * then a modify/write/read cycle when writing to a page in the
335 * page cache.
336 *
337 * The modify/write/read cycle may occur if a page is read before
338 * being completely filled by the writer. In this situation, the
339 * page must be completely written to stable storage on the server
340 * before it can be refilled by reading in the page from the server.
341 * This can lead to expensive, small, FILE_SYNC mode writes being
342 * done.
343 *
344 * It may be more efficient to read the page first if the file is
345 * open for reading in addition to writing, the page is not marked
346 * as Uptodate, it is not dirty or waiting to be committed,
347 * indicating that it was previously allocated and then modified,
348 * that there were valid bytes of data in that range of the file,
349 * and that the new data won't completely replace the old data in
350 * that range of the file.
351 */
352static int nfs_want_read_modify_write(struct file *file, struct page *page,
353 loff_t pos, unsigned len)
354{
355 unsigned int pglen = nfs_page_length(page);
356 unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
357 unsigned int end = offset + len;
358
359 if ((file->f_mode & FMODE_READ) && /* open for read? */
360 !PageUptodate(page) && /* Uptodate? */
361 !PagePrivate(page) && /* i/o request already? */
362 pglen && /* valid bytes of file? */
363 (end < pglen || offset)) /* replace all valid bytes? */
364 return 1;
365 return 0;
366}
367
1da177e4 368/*
4899f9c8
NP
369 * This does the "real" work of the write. We must allocate and lock the
370 * page to be sent back to the generic routine, which then copies the
371 * data from user space.
1da177e4
LT
372 *
373 * If the writer ends up delaying the write, the writer needs to
374 * increment the page use counts until he is done with the page.
375 */
4899f9c8
NP
376static int nfs_write_begin(struct file *file, struct address_space *mapping,
377 loff_t pos, unsigned len, unsigned flags,
378 struct page **pagep, void **fsdata)
1da177e4 379{
4899f9c8 380 int ret;
38c73044 381 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
4899f9c8 382 struct page *page;
38c73044 383 int once_thru = 0;
4899f9c8 384
b7eaefaa
CL
385 dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
386 file->f_path.dentry->d_parent->d_name.name,
387 file->f_path.dentry->d_name.name,
388 mapping->host->i_ino, len, (long long) pos);
389
e5e94017
BH
390 pnfs_update_layout(mapping->host,
391 nfs_file_open_context(file),
392 IOMODE_RW);
393
38c73044 394start:
72cb77f4
TM
395 /*
396 * Prevent starvation issues if someone is doing a consistency
397 * sync-to-disk
398 */
399 ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
400 nfs_wait_bit_killable, TASK_KILLABLE);
401 if (ret)
402 return ret;
403
54566b2c 404 page = grab_cache_page_write_begin(mapping, index, flags);
4899f9c8
NP
405 if (!page)
406 return -ENOMEM;
407 *pagep = page;
408
409 ret = nfs_flush_incompatible(file, page);
410 if (ret) {
411 unlock_page(page);
412 page_cache_release(page);
38c73044
PS
413 } else if (!once_thru &&
414 nfs_want_read_modify_write(file, page, pos, len)) {
415 once_thru = 1;
416 ret = nfs_readpage(file, page);
417 page_cache_release(page);
418 if (!ret)
419 goto start;
4899f9c8
NP
420 }
421 return ret;
1da177e4
LT
422}
423
4899f9c8
NP
424static int nfs_write_end(struct file *file, struct address_space *mapping,
425 loff_t pos, unsigned len, unsigned copied,
426 struct page *page, void *fsdata)
1da177e4 427{
4899f9c8
NP
428 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
429 int status;
1da177e4 430
b7eaefaa
CL
431 dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
432 file->f_path.dentry->d_parent->d_name.name,
433 file->f_path.dentry->d_name.name,
434 mapping->host->i_ino, len, (long long) pos);
435
efc91ed0
TM
436 /*
437 * Zero any uninitialised parts of the page, and then mark the page
438 * as up to date if it turns out that we're extending the file.
439 */
440 if (!PageUptodate(page)) {
441 unsigned pglen = nfs_page_length(page);
442 unsigned end = offset + len;
443
444 if (pglen == 0) {
445 zero_user_segments(page, 0, offset,
446 end, PAGE_CACHE_SIZE);
447 SetPageUptodate(page);
448 } else if (end >= pglen) {
449 zero_user_segment(page, end, PAGE_CACHE_SIZE);
450 if (offset == 0)
451 SetPageUptodate(page);
452 } else
453 zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
454 }
455
4899f9c8 456 status = nfs_updatepage(file, page, offset, copied);
4899f9c8
NP
457
458 unlock_page(page);
459 page_cache_release(page);
460
3d509e54
CL
461 if (status < 0)
462 return status;
463 return copied;
1da177e4
LT
464}
465
6b9b3514
DH
466/*
467 * Partially or wholly invalidate a page
468 * - Release the private state associated with a page if undergoing complete
469 * page invalidation
545db45f 470 * - Called if either PG_private or PG_fscache is set on the page
6b9b3514
DH
471 * - Caller holds page lock
472 */
2ff28e22 473static void nfs_invalidate_page(struct page *page, unsigned long offset)
cd52ed35 474{
b7eaefaa
CL
475 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
476
1c75950b
TM
477 if (offset != 0)
478 return;
d2ccddf0 479 /* Cancel any unstarted writes on this page */
1b3b4a1a 480 nfs_wb_page_cancel(page->mapping->host, page);
545db45f
DH
481
482 nfs_fscache_invalidate_page(page, page->mapping->host);
cd52ed35
TM
483}
484
6b9b3514
DH
485/*
486 * Attempt to release the private state associated with a page
545db45f 487 * - Called if either PG_private or PG_fscache is set on the page
6b9b3514
DH
488 * - Caller holds page lock
489 * - Return true (may release page) or false (may not)
490 */
cd52ed35
TM
491static int nfs_release_page(struct page *page, gfp_t gfp)
492{
b608b283
TM
493 struct address_space *mapping = page->mapping;
494
b7eaefaa
CL
495 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
496
d812e575 497 /* Only do I/O if gfp is a superset of GFP_KERNEL */
b608b283
TM
498 if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
499 int how = FLUSH_SYNC;
500
501 /* Don't let kswapd deadlock waiting for OOM RPC calls */
502 if (current_is_kswapd())
503 how = 0;
504 nfs_commit_inode(mapping->host, how);
505 }
e3db7691 506 /* If PagePrivate() is set, then the page is not freeable */
545db45f
DH
507 if (PagePrivate(page))
508 return 0;
509 return nfs_fscache_release_page(page, gfp);
e3db7691
TM
510}
511
6b9b3514
DH
512/*
513 * Attempt to clear the private state associated with a page when an error
514 * occurs that requires the cached contents of an inode to be written back or
515 * destroyed
545db45f 516 * - Called if either PG_private or fscache is set on the page
6b9b3514
DH
517 * - Caller holds page lock
518 * - Return 0 if successful, -error otherwise
519 */
e3db7691
TM
520static int nfs_launder_page(struct page *page)
521{
b7eaefaa 522 struct inode *inode = page->mapping->host;
545db45f 523 struct nfs_inode *nfsi = NFS_I(inode);
b7eaefaa
CL
524
525 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
526 inode->i_ino, (long long)page_offset(page));
527
545db45f 528 nfs_fscache_wait_on_page_write(nfsi, page);
b7eaefaa 529 return nfs_wb_page(inode, page);
cd52ed35
TM
530}
531
f5e54d6e 532const struct address_space_operations nfs_file_aops = {
1da177e4
LT
533 .readpage = nfs_readpage,
534 .readpages = nfs_readpages,
9cccef95 535 .set_page_dirty = __set_page_dirty_nobuffers,
1da177e4
LT
536 .writepage = nfs_writepage,
537 .writepages = nfs_writepages,
4899f9c8
NP
538 .write_begin = nfs_write_begin,
539 .write_end = nfs_write_end,
cd52ed35
TM
540 .invalidatepage = nfs_invalidate_page,
541 .releasepage = nfs_release_page,
1da177e4 542 .direct_IO = nfs_direct_IO,
074cc1de 543 .migratepage = nfs_migrate_page,
e3db7691 544 .launder_page = nfs_launder_page,
f590f333 545 .error_remove_page = generic_error_remove_page,
1da177e4
LT
546};
547
6b9b3514
DH
548/*
549 * Notification that a PTE pointing to an NFS page is about to be made
550 * writable, implying that someone is about to modify the page through a
551 * shared-writable mapping
552 */
c2ec175c 553static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
94387fb1 554{
c2ec175c 555 struct page *page = vmf->page;
94387fb1 556 struct file *filp = vma->vm_file;
b7eaefaa 557 struct dentry *dentry = filp->f_path.dentry;
94387fb1 558 unsigned pagelen;
bc4866b6 559 int ret = VM_FAULT_NOPAGE;
4899f9c8 560 struct address_space *mapping;
94387fb1 561
b7eaefaa
CL
562 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
563 dentry->d_parent->d_name.name, dentry->d_name.name,
564 filp->f_mapping->host->i_ino,
565 (long long)page_offset(page));
566
545db45f
DH
567 /* make sure the cache has finished storing the page */
568 nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);
569
94387fb1 570 lock_page(page);
4899f9c8 571 mapping = page->mapping;
b7eaefaa 572 if (mapping != dentry->d_inode->i_mapping)
8b1f9ee5
TM
573 goto out_unlock;
574
94387fb1 575 pagelen = nfs_page_length(page);
8b1f9ee5
TM
576 if (pagelen == 0)
577 goto out_unlock;
4899f9c8 578
bc4866b6
TM
579 ret = VM_FAULT_LOCKED;
580 if (nfs_flush_incompatible(filp, page) == 0 &&
581 nfs_updatepage(filp, page, 0, pagelen) == 0)
582 goto out;
8b1f9ee5 583
bc4866b6 584 ret = VM_FAULT_SIGBUS;
8b1f9ee5
TM
585out_unlock:
586 unlock_page(page);
bc4866b6
TM
587out:
588 return ret;
94387fb1
TM
589}
590
f0f37e2f 591static const struct vm_operations_struct nfs_file_vm_ops = {
94387fb1
TM
592 .fault = filemap_fault,
593 .page_mkwrite = nfs_vm_page_mkwrite,
594};
595
7b159fc1
TM
596static int nfs_need_sync_write(struct file *filp, struct inode *inode)
597{
598 struct nfs_open_context *ctx;
599
6b2f3d1f 600 if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
7b159fc1 601 return 1;
cd3758e3 602 ctx = nfs_file_open_context(filp);
7b159fc1
TM
603 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags))
604 return 1;
605 return 0;
606}
607
027445c3
BP
608static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
609 unsigned long nr_segs, loff_t pos)
1da177e4 610{
01cce933 611 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
1da177e4 612 struct inode * inode = dentry->d_inode;
7e381172 613 unsigned long written = 0;
1da177e4 614 ssize_t result;
027445c3 615 size_t count = iov_length(iov, nr_segs);
1da177e4 616
1da177e4 617 if (iocb->ki_filp->f_flags & O_DIRECT)
027445c3 618 return nfs_file_direct_write(iocb, iov, nr_segs, pos);
1da177e4 619
6da24bc9 620 dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
1da177e4 621 dentry->d_parent->d_name.name, dentry->d_name.name,
6da24bc9 622 (unsigned long) count, (long long) pos);
1da177e4
LT
623
624 result = -EBUSY;
625 if (IS_SWAPFILE(inode))
626 goto out_swapfile;
7d52e862
TM
627 /*
628 * O_APPEND implies that we must revalidate the file length.
629 */
630 if (iocb->ki_filp->f_flags & O_APPEND) {
631 result = nfs_revalidate_file_size(inode, iocb->ki_filp);
632 if (result)
633 goto out;
fe51beec 634 }
1da177e4
LT
635
636 result = count;
637 if (!count)
638 goto out;
639
027445c3 640 result = generic_file_aio_write(iocb, iov, nr_segs, pos);
7e381172
CL
641 if (result > 0)
642 written = result;
643
6b2f3d1f 644 /* Return error values for O_DSYNC and IS_SYNC() */
7b159fc1 645 if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
af7fa165 646 int err = vfs_fsync(iocb->ki_filp, 0);
200baa21
TM
647 if (err < 0)
648 result = err;
649 }
7e381172
CL
650 if (result > 0)
651 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
1da177e4
LT
652out:
653 return result;
654
655out_swapfile:
656 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
657 goto out;
658}
659
bf40d343
SJ
660static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
661 struct file *filp, loff_t *ppos,
662 size_t count, unsigned int flags)
663{
664 struct dentry *dentry = filp->f_path.dentry;
665 struct inode *inode = dentry->d_inode;
7e381172 666 unsigned long written = 0;
bf40d343
SJ
667 ssize_t ret;
668
669 dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
670 dentry->d_parent->d_name.name, dentry->d_name.name,
671 (unsigned long) count, (unsigned long long) *ppos);
672
673 /*
674 * The combination of splice and an O_APPEND destination is disallowed.
675 */
676
bf40d343 677 ret = generic_file_splice_write(pipe, filp, ppos, count, flags);
7e381172
CL
678 if (ret > 0)
679 written = ret;
680
bf40d343 681 if (ret >= 0 && nfs_need_sync_write(filp, inode)) {
af7fa165 682 int err = vfs_fsync(filp, 0);
bf40d343
SJ
683 if (err < 0)
684 ret = err;
685 }
7e381172
CL
686 if (ret > 0)
687 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
bf40d343
SJ
688 return ret;
689}
690
5eebde23
SJ
691static int
692do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
1da177e4
LT
693{
694 struct inode *inode = filp->f_mapping->host;
695 int status = 0;
696
039c4d7a 697 /* Try local locking first */
6d34ac19
BF
698 posix_test_lock(filp, fl);
699 if (fl->fl_type != F_UNLCK) {
700 /* found a conflict */
039c4d7a 701 goto out;
1da177e4 702 }
039c4d7a
TM
703
704 if (nfs_have_delegation(inode, FMODE_READ))
705 goto out_noconflict;
706
5eebde23 707 if (is_local)
039c4d7a
TM
708 goto out_noconflict;
709
710 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
711out:
1da177e4 712 return status;
039c4d7a
TM
713out_noconflict:
714 fl->fl_type = F_UNLCK;
715 goto out;
1da177e4
LT
716}
717
718static int do_vfs_lock(struct file *file, struct file_lock *fl)
719{
720 int res = 0;
721 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
722 case FL_POSIX:
723 res = posix_lock_file_wait(file, fl);
724 break;
725 case FL_FLOCK:
726 res = flock_lock_file_wait(file, fl);
727 break;
728 default:
729 BUG();
730 }
1da177e4
LT
731 return res;
732}
733
5eebde23
SJ
734static int
735do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
1da177e4
LT
736{
737 struct inode *inode = filp->f_mapping->host;
1da177e4
LT
738 int status;
739
1da177e4
LT
740 /*
741 * Flush all pending writes before doing anything
742 * with locks..
743 */
29884df0 744 nfs_sync_mapping(filp->f_mapping);
1da177e4
LT
745
746 /* NOTE: special case
747 * If we're signalled while cleaning up locks on process exit, we
748 * still need to complete the unlock.
749 */
5eebde23
SJ
750 /*
751 * Use local locking if mounted with "-onolock" or with appropriate
752 * "-olocal_lock="
753 */
754 if (!is_local)
1da177e4
LT
755 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
756 else
757 status = do_vfs_lock(filp, fl);
1da177e4
LT
758 return status;
759}
760
6b96724e
RL
761static int
762is_time_granular(struct timespec *ts) {
763 return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000));
764}
765
5eebde23
SJ
766static int
767do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
1da177e4
LT
768{
769 struct inode *inode = filp->f_mapping->host;
1da177e4
LT
770 int status;
771
1da177e4
LT
772 /*
773 * Flush all pending writes before doing anything
774 * with locks..
775 */
29884df0
TM
776 status = nfs_sync_mapping(filp->f_mapping);
777 if (status != 0)
1da177e4
LT
778 goto out;
779
5eebde23
SJ
780 /*
781 * Use local locking if mounted with "-onolock" or with appropriate
782 * "-olocal_lock="
783 */
784 if (!is_local)
1da177e4 785 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
c4d7c402 786 else
1da177e4 787 status = do_vfs_lock(filp, fl);
1da177e4
LT
788 if (status < 0)
789 goto out;
6b96724e 790
1da177e4 791 /*
6b96724e
RL
792 * Revalidate the cache if the server has time stamps granular
793 * enough to detect subsecond changes. Otherwise, clear the
794 * cache to prevent missing any changes.
795 *
1da177e4
LT
796 * This makes locking act as a cache coherency point.
797 */
29884df0 798 nfs_sync_mapping(filp->f_mapping);
6b96724e
RL
799 if (!nfs_have_delegation(inode, FMODE_READ)) {
800 if (is_time_granular(&NFS_SERVER(inode)->time_delta))
801 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
802 else
803 nfs_zap_caches(inode);
804 }
1da177e4 805out:
1da177e4
LT
806 return status;
807}
808
809/*
810 * Lock a (portion of) a file
811 */
812static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
813{
6da24bc9 814 struct inode *inode = filp->f_mapping->host;
2116271a 815 int ret = -ENOLCK;
5eebde23 816 int is_local = 0;
1da177e4 817
6da24bc9
CL
818 dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
819 filp->f_path.dentry->d_parent->d_name.name,
820 filp->f_path.dentry->d_name.name,
1da177e4
LT
821 fl->fl_type, fl->fl_flags,
822 (long long)fl->fl_start, (long long)fl->fl_end);
6da24bc9 823
91d5b470 824 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
1da177e4
LT
825
826 /* No mandatory locks over NFS */
dfad9441 827 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
2116271a
TM
828 goto out_err;
829
5eebde23
SJ
830 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
831 is_local = 1;
832
2116271a
TM
833 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
834 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
835 if (ret < 0)
836 goto out_err;
837 }
1da177e4
LT
838
839 if (IS_GETLK(cmd))
5eebde23 840 ret = do_getlk(filp, cmd, fl, is_local);
2116271a 841 else if (fl->fl_type == F_UNLCK)
5eebde23 842 ret = do_unlk(filp, cmd, fl, is_local);
2116271a 843 else
5eebde23 844 ret = do_setlk(filp, cmd, fl, is_local);
2116271a
TM
845out_err:
846 return ret;
1da177e4
LT
847}
848
849/*
850 * Lock a (portion of) a file
851 */
852static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
853{
5eebde23
SJ
854 struct inode *inode = filp->f_mapping->host;
855 int is_local = 0;
856
6da24bc9
CL
857 dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
858 filp->f_path.dentry->d_parent->d_name.name,
859 filp->f_path.dentry->d_name.name,
1da177e4
LT
860 fl->fl_type, fl->fl_flags);
861
1da177e4
LT
862 if (!(fl->fl_flags & FL_FLOCK))
863 return -ENOLCK;
864
5eebde23
SJ
865 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
866 is_local = 1;
867
1da177e4
LT
868 /* We're simulating flock() locks using posix locks on the server */
869 fl->fl_owner = (fl_owner_t)filp;
870 fl->fl_start = 0;
871 fl->fl_end = OFFSET_MAX;
872
873 if (fl->fl_type == F_UNLCK)
5eebde23
SJ
874 return do_unlk(filp, cmd, fl, is_local);
875 return do_setlk(filp, cmd, fl, is_local);
1da177e4 876}
370f6599 877
6da24bc9
CL
878/*
879 * There is no protocol support for leases, so we have no way to implement
880 * them correctly in the face of opens by other clients.
881 */
370f6599
BF
882static int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
883{
6da24bc9
CL
884 dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
885 file->f_path.dentry->d_parent->d_name.name,
886 file->f_path.dentry->d_name.name, arg);
370f6599
BF
887 return -EINVAL;
888}