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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/module.h>
20#include <linux/time.h>
21#include <linux/kernel.h>
22#include <linux/errno.h>
23#include <linux/fcntl.h>
24#include <linux/stat.h>
25#include <linux/nfs_fs.h>
26#include <linux/nfs_mount.h>
27#include <linux/mm.h>
28#include <linux/pagemap.h>
29#include <linux/gfp.h>
30#include <linux/swap.h>
31
32#include <linux/uaccess.h>
33
34#include "delegation.h"
35#include "internal.h"
36#include "iostat.h"
37#include "fscache.h"
38#include "pnfs.h"
39
40#include "nfstrace.h"
41
42#define NFSDBG_FACILITY NFSDBG_FILE
43
44static const struct vm_operations_struct nfs_file_vm_ops;
45
46/* Hack for future NFS swap support */
47#ifndef IS_SWAPFILE
48# define IS_SWAPFILE(inode) (0)
49#endif
50
51int nfs_check_flags(int flags)
52{
53 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
54 return -EINVAL;
55
56 return 0;
57}
58EXPORT_SYMBOL_GPL(nfs_check_flags);
59
60/*
61 * Open file
62 */
63static int
64nfs_file_open(struct inode *inode, struct file *filp)
65{
66 int res;
67
68 dprintk("NFS: open file(%pD2)\n", filp);
69
70 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
71 res = nfs_check_flags(filp->f_flags);
72 if (res)
73 return res;
74
75 res = nfs_open(inode, filp);
76 return res;
77}
78
79int
80nfs_file_release(struct inode *inode, struct file *filp)
81{
82 dprintk("NFS: release(%pD2)\n", filp);
83
84 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
85 nfs_file_clear_open_context(filp);
86 return 0;
87}
88EXPORT_SYMBOL_GPL(nfs_file_release);
89
90/**
91 * nfs_revalidate_size - Revalidate the file size
92 * @inode - pointer to inode struct
93 * @file - pointer to struct file
94 *
95 * Revalidates the file length. This is basically a wrapper around
96 * nfs_revalidate_inode() that takes into account the fact that we may
97 * have cached writes (in which case we don't care about the server's
98 * idea of what the file length is), or O_DIRECT (in which case we
99 * shouldn't trust the cache).
100 */
101static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
102{
103 struct nfs_server *server = NFS_SERVER(inode);
104
105 if (filp->f_flags & O_DIRECT)
106 goto force_reval;
107 if (nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE))
108 goto force_reval;
109 return 0;
110force_reval:
111 return __nfs_revalidate_inode(server, inode);
112}
113
114loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence)
115{
116 dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
117 filp, offset, whence);
118
119 /*
120 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
121 * the cached file length
122 */
123 if (whence != SEEK_SET && whence != SEEK_CUR) {
124 struct inode *inode = filp->f_mapping->host;
125
126 int retval = nfs_revalidate_file_size(inode, filp);
127 if (retval < 0)
128 return (loff_t)retval;
129 }
130
131 return generic_file_llseek(filp, offset, whence);
132}
133EXPORT_SYMBOL_GPL(nfs_file_llseek);
134
135/*
136 * Flush all dirty pages, and check for write errors.
137 */
138static int
139nfs_file_flush(struct file *file, fl_owner_t id)
140{
141 struct inode *inode = file_inode(file);
142
143 dprintk("NFS: flush(%pD2)\n", file);
144
145 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
146 if ((file->f_mode & FMODE_WRITE) == 0)
147 return 0;
148
149 /* Flush writes to the server and return any errors */
150 return vfs_fsync(file, 0);
151}
152
153ssize_t
154nfs_file_read(struct kiocb *iocb, struct iov_iter *to)
155{
156 struct inode *inode = file_inode(iocb->ki_filp);
157 ssize_t result;
158
159 if (iocb->ki_flags & IOCB_DIRECT)
160 return nfs_file_direct_read(iocb, to);
161
162 dprintk("NFS: read(%pD2, %zu@%lu)\n",
163 iocb->ki_filp,
164 iov_iter_count(to), (unsigned long) iocb->ki_pos);
165
166 nfs_start_io_read(inode);
167 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
168 if (!result) {
169 result = generic_file_read_iter(iocb, to);
170 if (result > 0)
171 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
172 }
173 nfs_end_io_read(inode);
174 return result;
175}
176EXPORT_SYMBOL_GPL(nfs_file_read);
177
178int
179nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
180{
181 struct inode *inode = file_inode(file);
182 int status;
183
184 dprintk("NFS: mmap(%pD2)\n", file);
185
186 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
187 * so we call that before revalidating the mapping
188 */
189 status = generic_file_mmap(file, vma);
190 if (!status) {
191 vma->vm_ops = &nfs_file_vm_ops;
192 status = nfs_revalidate_mapping(inode, file->f_mapping);
193 }
194 return status;
195}
196EXPORT_SYMBOL_GPL(nfs_file_mmap);
197
198/*
199 * Flush any dirty pages for this process, and check for write errors.
200 * The return status from this call provides a reliable indication of
201 * whether any write errors occurred for this process.
202 *
203 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
204 * disk, but it retrieves and clears ctx->error after synching, despite
205 * the two being set at the same time in nfs_context_set_write_error().
206 * This is because the former is used to notify the _next_ call to
207 * nfs_file_write() that a write error occurred, and hence cause it to
208 * fall back to doing a synchronous write.
209 */
210static int
211nfs_file_fsync_commit(struct file *file, loff_t start, loff_t end, int datasync)
212{
213 struct nfs_open_context *ctx = nfs_file_open_context(file);
214 struct inode *inode = file_inode(file);
215 int have_error, do_resend, status;
216 int ret = 0;
217
218 dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);
219
220 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
221 do_resend = test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
222 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
223 status = nfs_commit_inode(inode, FLUSH_SYNC);
224 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
225 if (have_error) {
226 ret = xchg(&ctx->error, 0);
227 if (ret)
228 goto out;
229 }
230 if (status < 0) {
231 ret = status;
232 goto out;
233 }
234 do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags);
235 if (do_resend)
236 ret = -EAGAIN;
237out:
238 return ret;
239}
240
241int
242nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
243{
244 int ret;
245 struct inode *inode = file_inode(file);
246
247 trace_nfs_fsync_enter(inode);
248
249 do {
250 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
251 if (ret != 0)
252 break;
253 ret = nfs_file_fsync_commit(file, start, end, datasync);
254 if (!ret)
255 ret = pnfs_sync_inode(inode, !!datasync);
256 /*
257 * If nfs_file_fsync_commit detected a server reboot, then
258 * resend all dirty pages that might have been covered by
259 * the NFS_CONTEXT_RESEND_WRITES flag
260 */
261 start = 0;
262 end = LLONG_MAX;
263 } while (ret == -EAGAIN);
264
265 trace_nfs_fsync_exit(inode, ret);
266 return ret;
267}
268EXPORT_SYMBOL_GPL(nfs_file_fsync);
269
270/*
271 * Decide whether a read/modify/write cycle may be more efficient
272 * then a modify/write/read cycle when writing to a page in the
273 * page cache.
274 *
275 * The modify/write/read cycle may occur if a page is read before
276 * being completely filled by the writer. In this situation, the
277 * page must be completely written to stable storage on the server
278 * before it can be refilled by reading in the page from the server.
279 * This can lead to expensive, small, FILE_SYNC mode writes being
280 * done.
281 *
282 * It may be more efficient to read the page first if the file is
283 * open for reading in addition to writing, the page is not marked
284 * as Uptodate, it is not dirty or waiting to be committed,
285 * indicating that it was previously allocated and then modified,
286 * that there were valid bytes of data in that range of the file,
287 * and that the new data won't completely replace the old data in
288 * that range of the file.
289 */
290static int nfs_want_read_modify_write(struct file *file, struct page *page,
291 loff_t pos, unsigned len)
292{
293 unsigned int pglen = nfs_page_length(page);
294 unsigned int offset = pos & (PAGE_SIZE - 1);
295 unsigned int end = offset + len;
296
297 if (pnfs_ld_read_whole_page(file->f_mapping->host)) {
298 if (!PageUptodate(page))
299 return 1;
300 return 0;
301 }
302
303 if ((file->f_mode & FMODE_READ) && /* open for read? */
304 !PageUptodate(page) && /* Uptodate? */
305 !PagePrivate(page) && /* i/o request already? */
306 pglen && /* valid bytes of file? */
307 (end < pglen || offset)) /* replace all valid bytes? */
308 return 1;
309 return 0;
310}
311
312/*
313 * This does the "real" work of the write. We must allocate and lock the
314 * page to be sent back to the generic routine, which then copies the
315 * data from user space.
316 *
317 * If the writer ends up delaying the write, the writer needs to
318 * increment the page use counts until he is done with the page.
319 */
320static int nfs_write_begin(struct file *file, struct address_space *mapping,
321 loff_t pos, unsigned len, unsigned flags,
322 struct page **pagep, void **fsdata)
323{
324 int ret;
325 pgoff_t index = pos >> PAGE_SHIFT;
326 struct page *page;
327 int once_thru = 0;
328
329 dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
330 file, mapping->host->i_ino, len, (long long) pos);
331
332start:
333 page = grab_cache_page_write_begin(mapping, index, flags);
334 if (!page)
335 return -ENOMEM;
336 *pagep = page;
337
338 ret = nfs_flush_incompatible(file, page);
339 if (ret) {
340 unlock_page(page);
341 put_page(page);
342 } else if (!once_thru &&
343 nfs_want_read_modify_write(file, page, pos, len)) {
344 once_thru = 1;
345 ret = nfs_readpage(file, page);
346 put_page(page);
347 if (!ret)
348 goto start;
349 }
350 return ret;
351}
352
353static int nfs_write_end(struct file *file, struct address_space *mapping,
354 loff_t pos, unsigned len, unsigned copied,
355 struct page *page, void *fsdata)
356{
357 unsigned offset = pos & (PAGE_SIZE - 1);
358 struct nfs_open_context *ctx = nfs_file_open_context(file);
359 int status;
360
361 dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
362 file, mapping->host->i_ino, len, (long long) pos);
363
364 /*
365 * Zero any uninitialised parts of the page, and then mark the page
366 * as up to date if it turns out that we're extending the file.
367 */
368 if (!PageUptodate(page)) {
369 unsigned pglen = nfs_page_length(page);
370 unsigned end = offset + copied;
371
372 if (pglen == 0) {
373 zero_user_segments(page, 0, offset,
374 end, PAGE_SIZE);
375 SetPageUptodate(page);
376 } else if (end >= pglen) {
377 zero_user_segment(page, end, PAGE_SIZE);
378 if (offset == 0)
379 SetPageUptodate(page);
380 } else
381 zero_user_segment(page, pglen, PAGE_SIZE);
382 }
383
384 status = nfs_updatepage(file, page, offset, copied);
385
386 unlock_page(page);
387 put_page(page);
388
389 if (status < 0)
390 return status;
391 NFS_I(mapping->host)->write_io += copied;
392
393 if (nfs_ctx_key_to_expire(ctx, mapping->host)) {
394 status = nfs_wb_all(mapping->host);
395 if (status < 0)
396 return status;
397 }
398
399 return copied;
400}
401
402/*
403 * Partially or wholly invalidate a page
404 * - Release the private state associated with a page if undergoing complete
405 * page invalidation
406 * - Called if either PG_private or PG_fscache is set on the page
407 * - Caller holds page lock
408 */
409static void nfs_invalidate_page(struct page *page, unsigned int offset,
410 unsigned int length)
411{
412 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n",
413 page, offset, length);
414
415 if (offset != 0 || length < PAGE_SIZE)
416 return;
417 /* Cancel any unstarted writes on this page */
418 nfs_wb_page_cancel(page_file_mapping(page)->host, page);
419
420 nfs_fscache_invalidate_page(page, page->mapping->host);
421}
422
423/*
424 * Attempt to release the private state associated with a page
425 * - Called if either PG_private or PG_fscache is set on the page
426 * - Caller holds page lock
427 * - Return true (may release page) or false (may not)
428 */
429static int nfs_release_page(struct page *page, gfp_t gfp)
430{
431 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
432
433 /* If PagePrivate() is set, then the page is not freeable */
434 if (PagePrivate(page))
435 return 0;
436 return nfs_fscache_release_page(page, gfp);
437}
438
439static void nfs_check_dirty_writeback(struct page *page,
440 bool *dirty, bool *writeback)
441{
442 struct nfs_inode *nfsi;
443 struct address_space *mapping = page_file_mapping(page);
444
445 if (!mapping || PageSwapCache(page))
446 return;
447
448 /*
449 * Check if an unstable page is currently being committed and
450 * if so, have the VM treat it as if the page is under writeback
451 * so it will not block due to pages that will shortly be freeable.
452 */
453 nfsi = NFS_I(mapping->host);
454 if (atomic_read(&nfsi->commit_info.rpcs_out)) {
455 *writeback = true;
456 return;
457 }
458
459 /*
460 * If PagePrivate() is set, then the page is not freeable and as the
461 * inode is not being committed, it's not going to be cleaned in the
462 * near future so treat it as dirty
463 */
464 if (PagePrivate(page))
465 *dirty = true;
466}
467
468/*
469 * Attempt to clear the private state associated with a page when an error
470 * occurs that requires the cached contents of an inode to be written back or
471 * destroyed
472 * - Called if either PG_private or fscache is set on the page
473 * - Caller holds page lock
474 * - Return 0 if successful, -error otherwise
475 */
476static int nfs_launder_page(struct page *page)
477{
478 struct inode *inode = page_file_mapping(page)->host;
479 struct nfs_inode *nfsi = NFS_I(inode);
480
481 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
482 inode->i_ino, (long long)page_offset(page));
483
484 nfs_fscache_wait_on_page_write(nfsi, page);
485 return nfs_wb_launder_page(inode, page);
486}
487
488static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
489 sector_t *span)
490{
491 struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
492
493 *span = sis->pages;
494
495 return rpc_clnt_swap_activate(clnt);
496}
497
498static void nfs_swap_deactivate(struct file *file)
499{
500 struct rpc_clnt *clnt = NFS_CLIENT(file->f_mapping->host);
501
502 rpc_clnt_swap_deactivate(clnt);
503}
504
505const struct address_space_operations nfs_file_aops = {
506 .readpage = nfs_readpage,
507 .readpages = nfs_readpages,
508 .set_page_dirty = __set_page_dirty_nobuffers,
509 .writepage = nfs_writepage,
510 .writepages = nfs_writepages,
511 .write_begin = nfs_write_begin,
512 .write_end = nfs_write_end,
513 .invalidatepage = nfs_invalidate_page,
514 .releasepage = nfs_release_page,
515 .direct_IO = nfs_direct_IO,
516#ifdef CONFIG_MIGRATION
517 .migratepage = nfs_migrate_page,
518#endif
519 .launder_page = nfs_launder_page,
520 .is_dirty_writeback = nfs_check_dirty_writeback,
521 .error_remove_page = generic_error_remove_page,
522 .swap_activate = nfs_swap_activate,
523 .swap_deactivate = nfs_swap_deactivate,
524};
525
526/*
527 * Notification that a PTE pointing to an NFS page is about to be made
528 * writable, implying that someone is about to modify the page through a
529 * shared-writable mapping
530 */
531static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
532{
533 struct page *page = vmf->page;
534 struct file *filp = vma->vm_file;
535 struct inode *inode = file_inode(filp);
536 unsigned pagelen;
537 int ret = VM_FAULT_NOPAGE;
538 struct address_space *mapping;
539
540 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n",
541 filp, filp->f_mapping->host->i_ino,
542 (long long)page_offset(page));
543
544 sb_start_pagefault(inode->i_sb);
545
546 /* make sure the cache has finished storing the page */
547 nfs_fscache_wait_on_page_write(NFS_I(inode), page);
548
549 wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
550 nfs_wait_bit_killable, TASK_KILLABLE);
551
552 lock_page(page);
553 mapping = page_file_mapping(page);
554 if (mapping != inode->i_mapping)
555 goto out_unlock;
556
557 wait_on_page_writeback(page);
558
559 pagelen = nfs_page_length(page);
560 if (pagelen == 0)
561 goto out_unlock;
562
563 ret = VM_FAULT_LOCKED;
564 if (nfs_flush_incompatible(filp, page) == 0 &&
565 nfs_updatepage(filp, page, 0, pagelen) == 0)
566 goto out;
567
568 ret = VM_FAULT_SIGBUS;
569out_unlock:
570 unlock_page(page);
571out:
572 sb_end_pagefault(inode->i_sb);
573 return ret;
574}
575
576static const struct vm_operations_struct nfs_file_vm_ops = {
577 .fault = filemap_fault,
578 .map_pages = filemap_map_pages,
579 .page_mkwrite = nfs_vm_page_mkwrite,
580};
581
582static int nfs_need_check_write(struct file *filp, struct inode *inode)
583{
584 struct nfs_open_context *ctx;
585
586 ctx = nfs_file_open_context(filp);
587 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) ||
588 nfs_ctx_key_to_expire(ctx, inode))
589 return 1;
590 return 0;
591}
592
593ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
594{
595 struct file *file = iocb->ki_filp;
596 struct inode *inode = file_inode(file);
597 unsigned long written = 0;
598 ssize_t result;
599
600 result = nfs_key_timeout_notify(file, inode);
601 if (result)
602 return result;
603
604 if (iocb->ki_flags & IOCB_DIRECT)
605 return nfs_file_direct_write(iocb, from);
606
607 dprintk("NFS: write(%pD2, %zu@%Ld)\n",
608 file, iov_iter_count(from), (long long) iocb->ki_pos);
609
610 if (IS_SWAPFILE(inode))
611 goto out_swapfile;
612 /*
613 * O_APPEND implies that we must revalidate the file length.
614 */
615 if (iocb->ki_flags & IOCB_APPEND) {
616 result = nfs_revalidate_file_size(inode, file);
617 if (result)
618 goto out;
619 }
620
621 nfs_start_io_write(inode);
622 result = generic_write_checks(iocb, from);
623 if (result > 0) {
624 current->backing_dev_info = inode_to_bdi(inode);
625 result = generic_perform_write(file, from, iocb->ki_pos);
626 current->backing_dev_info = NULL;
627 }
628 nfs_end_io_write(inode);
629 if (result <= 0)
630 goto out;
631
632 result = generic_write_sync(iocb, result);
633 if (result < 0)
634 goto out;
635 written = result;
636 iocb->ki_pos += written;
637
638 /* Return error values */
639 if (nfs_need_check_write(file, inode)) {
640 int err = vfs_fsync(file, 0);
641 if (err < 0)
642 result = err;
643 }
644 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
645out:
646 return result;
647
648out_swapfile:
649 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
650 return -EBUSY;
651}
652EXPORT_SYMBOL_GPL(nfs_file_write);
653
654static int
655do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
656{
657 struct inode *inode = filp->f_mapping->host;
658 int status = 0;
659 unsigned int saved_type = fl->fl_type;
660
661 /* Try local locking first */
662 posix_test_lock(filp, fl);
663 if (fl->fl_type != F_UNLCK) {
664 /* found a conflict */
665 goto out;
666 }
667 fl->fl_type = saved_type;
668
669 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
670 goto out_noconflict;
671
672 if (is_local)
673 goto out_noconflict;
674
675 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
676out:
677 return status;
678out_noconflict:
679 fl->fl_type = F_UNLCK;
680 goto out;
681}
682
683static int
684do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
685{
686 struct inode *inode = filp->f_mapping->host;
687 struct nfs_lock_context *l_ctx;
688 int status;
689
690 /*
691 * Flush all pending writes before doing anything
692 * with locks..
693 */
694 vfs_fsync(filp, 0);
695
696 l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
697 if (!IS_ERR(l_ctx)) {
698 status = nfs_iocounter_wait(l_ctx);
699 nfs_put_lock_context(l_ctx);
700 if (status < 0)
701 return status;
702 }
703
704 /* NOTE: special case
705 * If we're signalled while cleaning up locks on process exit, we
706 * still need to complete the unlock.
707 */
708 /*
709 * Use local locking if mounted with "-onolock" or with appropriate
710 * "-olocal_lock="
711 */
712 if (!is_local)
713 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
714 else
715 status = locks_lock_file_wait(filp, fl);
716 return status;
717}
718
719static int
720do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
721{
722 struct inode *inode = filp->f_mapping->host;
723 int status;
724
725 /*
726 * Flush all pending writes before doing anything
727 * with locks..
728 */
729 status = nfs_sync_mapping(filp->f_mapping);
730 if (status != 0)
731 goto out;
732
733 /*
734 * Use local locking if mounted with "-onolock" or with appropriate
735 * "-olocal_lock="
736 */
737 if (!is_local)
738 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
739 else
740 status = locks_lock_file_wait(filp, fl);
741 if (status < 0)
742 goto out;
743
744 /*
745 * Revalidate the cache if the server has time stamps granular
746 * enough to detect subsecond changes. Otherwise, clear the
747 * cache to prevent missing any changes.
748 *
749 * This makes locking act as a cache coherency point.
750 */
751 nfs_sync_mapping(filp->f_mapping);
752 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
753 nfs_zap_mapping(inode, filp->f_mapping);
754out:
755 return status;
756}
757
758/*
759 * Lock a (portion of) a file
760 */
761int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
762{
763 struct inode *inode = filp->f_mapping->host;
764 int ret = -ENOLCK;
765 int is_local = 0;
766
767 dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n",
768 filp, fl->fl_type, fl->fl_flags,
769 (long long)fl->fl_start, (long long)fl->fl_end);
770
771 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
772
773 /* No mandatory locks over NFS */
774 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
775 goto out_err;
776
777 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
778 is_local = 1;
779
780 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
781 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
782 if (ret < 0)
783 goto out_err;
784 }
785
786 if (IS_GETLK(cmd))
787 ret = do_getlk(filp, cmd, fl, is_local);
788 else if (fl->fl_type == F_UNLCK)
789 ret = do_unlk(filp, cmd, fl, is_local);
790 else
791 ret = do_setlk(filp, cmd, fl, is_local);
792out_err:
793 return ret;
794}
795EXPORT_SYMBOL_GPL(nfs_lock);
796
797/*
798 * Lock a (portion of) a file
799 */
800int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
801{
802 struct inode *inode = filp->f_mapping->host;
803 int is_local = 0;
804
805 dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n",
806 filp, fl->fl_type, fl->fl_flags);
807
808 if (!(fl->fl_flags & FL_FLOCK))
809 return -ENOLCK;
810
811 /*
812 * The NFSv4 protocol doesn't support LOCK_MAND, which is not part of
813 * any standard. In principle we might be able to support LOCK_MAND
814 * on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the
815 * NFS code is not set up for it.
816 */
817 if (fl->fl_type & LOCK_MAND)
818 return -EINVAL;
819
820 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
821 is_local = 1;
822
823 /* We're simulating flock() locks using posix locks on the server */
824 if (fl->fl_type == F_UNLCK)
825 return do_unlk(filp, cmd, fl, is_local);
826 return do_setlk(filp, cmd, fl, is_local);
827}
828EXPORT_SYMBOL_GPL(nfs_flock);
829
830const struct file_operations nfs_file_operations = {
831 .llseek = nfs_file_llseek,
832 .read_iter = nfs_file_read,
833 .write_iter = nfs_file_write,
834 .mmap = nfs_file_mmap,
835 .open = nfs_file_open,
836 .flush = nfs_file_flush,
837 .release = nfs_file_release,
838 .fsync = nfs_file_fsync,
839 .lock = nfs_lock,
840 .flock = nfs_flock,
841 .splice_read = generic_file_splice_read,
842 .splice_write = iter_file_splice_write,
843 .check_flags = nfs_check_flags,
844 .setlease = simple_nosetlease,
845};
846EXPORT_SYMBOL_GPL(nfs_file_operations);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/fs/nfs/file.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * Changes Copyright (C) 1994 by Florian La Roche
8 * - Do not copy data too often around in the kernel.
9 * - In nfs_file_read the return value of kmalloc wasn't checked.
10 * - Put in a better version of read look-ahead buffering. Original idea
11 * and implementation by Wai S Kok elekokws@ee.nus.sg.
12 *
13 * Expire cache on write to a file by Wai S Kok (Oct 1994).
14 *
15 * Total rewrite of read side for new NFS buffer cache.. Linus.
16 *
17 * nfs regular file handling functions
18 */
19
20#include <linux/module.h>
21#include <linux/time.h>
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/fcntl.h>
25#include <linux/stat.h>
26#include <linux/nfs_fs.h>
27#include <linux/nfs_mount.h>
28#include <linux/mm.h>
29#include <linux/pagemap.h>
30#include <linux/gfp.h>
31#include <linux/swap.h>
32
33#include <linux/uaccess.h>
34
35#include "delegation.h"
36#include "internal.h"
37#include "iostat.h"
38#include "fscache.h"
39#include "pnfs.h"
40
41#include "nfstrace.h"
42
43#define NFSDBG_FACILITY NFSDBG_FILE
44
45static const struct vm_operations_struct nfs_file_vm_ops;
46
47int nfs_check_flags(int flags)
48{
49 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
50 return -EINVAL;
51
52 return 0;
53}
54EXPORT_SYMBOL_GPL(nfs_check_flags);
55
56/*
57 * Open file
58 */
59static int
60nfs_file_open(struct inode *inode, struct file *filp)
61{
62 int res;
63
64 dprintk("NFS: open file(%pD2)\n", filp);
65
66 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
67 res = nfs_check_flags(filp->f_flags);
68 if (res)
69 return res;
70
71 res = nfs_open(inode, filp);
72 if (res == 0)
73 filp->f_mode |= FMODE_CAN_ODIRECT;
74 return res;
75}
76
77int
78nfs_file_release(struct inode *inode, struct file *filp)
79{
80 dprintk("NFS: release(%pD2)\n", filp);
81
82 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
83 nfs_file_clear_open_context(filp);
84 nfs_fscache_release_file(inode, filp);
85 return 0;
86}
87EXPORT_SYMBOL_GPL(nfs_file_release);
88
89/**
90 * nfs_revalidate_file_size - Revalidate the file size
91 * @inode: pointer to inode struct
92 * @filp: pointer to struct file
93 *
94 * Revalidates the file length. This is basically a wrapper around
95 * nfs_revalidate_inode() that takes into account the fact that we may
96 * have cached writes (in which case we don't care about the server's
97 * idea of what the file length is), or O_DIRECT (in which case we
98 * shouldn't trust the cache).
99 */
100static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
101{
102 struct nfs_server *server = NFS_SERVER(inode);
103
104 if (filp->f_flags & O_DIRECT)
105 goto force_reval;
106 if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_SIZE))
107 goto force_reval;
108 return 0;
109force_reval:
110 return __nfs_revalidate_inode(server, inode);
111}
112
113loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence)
114{
115 dprintk("NFS: llseek file(%pD2, %lld, %d)\n",
116 filp, offset, whence);
117
118 /*
119 * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
120 * the cached file length
121 */
122 if (whence != SEEK_SET && whence != SEEK_CUR) {
123 struct inode *inode = filp->f_mapping->host;
124
125 int retval = nfs_revalidate_file_size(inode, filp);
126 if (retval < 0)
127 return (loff_t)retval;
128 }
129
130 return generic_file_llseek(filp, offset, whence);
131}
132EXPORT_SYMBOL_GPL(nfs_file_llseek);
133
134/*
135 * Flush all dirty pages, and check for write errors.
136 */
137static int
138nfs_file_flush(struct file *file, fl_owner_t id)
139{
140 struct inode *inode = file_inode(file);
141 errseq_t since;
142
143 dprintk("NFS: flush(%pD2)\n", file);
144
145 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
146 if ((file->f_mode & FMODE_WRITE) == 0)
147 return 0;
148
149 /* Flush writes to the server and return any errors */
150 since = filemap_sample_wb_err(file->f_mapping);
151 nfs_wb_all(inode);
152 return filemap_check_wb_err(file->f_mapping, since);
153}
154
155ssize_t
156nfs_file_read(struct kiocb *iocb, struct iov_iter *to)
157{
158 struct inode *inode = file_inode(iocb->ki_filp);
159 ssize_t result;
160
161 if (iocb->ki_flags & IOCB_DIRECT)
162 return nfs_file_direct_read(iocb, to, false);
163
164 dprintk("NFS: read(%pD2, %zu@%lu)\n",
165 iocb->ki_filp,
166 iov_iter_count(to), (unsigned long) iocb->ki_pos);
167
168 nfs_start_io_read(inode);
169 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
170 if (!result) {
171 result = generic_file_read_iter(iocb, to);
172 if (result > 0)
173 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
174 }
175 nfs_end_io_read(inode);
176 return result;
177}
178EXPORT_SYMBOL_GPL(nfs_file_read);
179
180int
181nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
182{
183 struct inode *inode = file_inode(file);
184 int status;
185
186 dprintk("NFS: mmap(%pD2)\n", file);
187
188 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
189 * so we call that before revalidating the mapping
190 */
191 status = generic_file_mmap(file, vma);
192 if (!status) {
193 vma->vm_ops = &nfs_file_vm_ops;
194 status = nfs_revalidate_mapping(inode, file->f_mapping);
195 }
196 return status;
197}
198EXPORT_SYMBOL_GPL(nfs_file_mmap);
199
200/*
201 * Flush any dirty pages for this process, and check for write errors.
202 * The return status from this call provides a reliable indication of
203 * whether any write errors occurred for this process.
204 */
205static int
206nfs_file_fsync_commit(struct file *file, int datasync)
207{
208 struct inode *inode = file_inode(file);
209 int ret, ret2;
210
211 dprintk("NFS: fsync file(%pD2) datasync %d\n", file, datasync);
212
213 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
214 ret = nfs_commit_inode(inode, FLUSH_SYNC);
215 ret2 = file_check_and_advance_wb_err(file);
216 if (ret2 < 0)
217 return ret2;
218 return ret;
219}
220
221int
222nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
223{
224 struct inode *inode = file_inode(file);
225 struct nfs_inode *nfsi = NFS_I(inode);
226 long save_nredirtied = atomic_long_read(&nfsi->redirtied_pages);
227 long nredirtied;
228 int ret;
229
230 trace_nfs_fsync_enter(inode);
231
232 for (;;) {
233 ret = file_write_and_wait_range(file, start, end);
234 if (ret != 0)
235 break;
236 ret = nfs_file_fsync_commit(file, datasync);
237 if (ret != 0)
238 break;
239 ret = pnfs_sync_inode(inode, !!datasync);
240 if (ret != 0)
241 break;
242 nredirtied = atomic_long_read(&nfsi->redirtied_pages);
243 if (nredirtied == save_nredirtied)
244 break;
245 save_nredirtied = nredirtied;
246 }
247
248 trace_nfs_fsync_exit(inode, ret);
249 return ret;
250}
251EXPORT_SYMBOL_GPL(nfs_file_fsync);
252
253/*
254 * Decide whether a read/modify/write cycle may be more efficient
255 * then a modify/write/read cycle when writing to a page in the
256 * page cache.
257 *
258 * Some pNFS layout drivers can only read/write at a certain block
259 * granularity like all block devices and therefore we must perform
260 * read/modify/write whenever a page hasn't read yet and the data
261 * to be written there is not aligned to a block boundary and/or
262 * smaller than the block size.
263 *
264 * The modify/write/read cycle may occur if a page is read before
265 * being completely filled by the writer. In this situation, the
266 * page must be completely written to stable storage on the server
267 * before it can be refilled by reading in the page from the server.
268 * This can lead to expensive, small, FILE_SYNC mode writes being
269 * done.
270 *
271 * It may be more efficient to read the page first if the file is
272 * open for reading in addition to writing, the page is not marked
273 * as Uptodate, it is not dirty or waiting to be committed,
274 * indicating that it was previously allocated and then modified,
275 * that there were valid bytes of data in that range of the file,
276 * and that the new data won't completely replace the old data in
277 * that range of the file.
278 */
279static bool nfs_full_page_write(struct page *page, loff_t pos, unsigned int len)
280{
281 unsigned int pglen = nfs_page_length(page);
282 unsigned int offset = pos & (PAGE_SIZE - 1);
283 unsigned int end = offset + len;
284
285 return !pglen || (end >= pglen && !offset);
286}
287
288static bool nfs_want_read_modify_write(struct file *file, struct page *page,
289 loff_t pos, unsigned int len)
290{
291 /*
292 * Up-to-date pages, those with ongoing or full-page write
293 * don't need read/modify/write
294 */
295 if (PageUptodate(page) || PagePrivate(page) ||
296 nfs_full_page_write(page, pos, len))
297 return false;
298
299 if (pnfs_ld_read_whole_page(file->f_mapping->host))
300 return true;
301 /* Open for reading too? */
302 if (file->f_mode & FMODE_READ)
303 return true;
304 return false;
305}
306
307/*
308 * This does the "real" work of the write. We must allocate and lock the
309 * page to be sent back to the generic routine, which then copies the
310 * data from user space.
311 *
312 * If the writer ends up delaying the write, the writer needs to
313 * increment the page use counts until he is done with the page.
314 */
315static int nfs_write_begin(struct file *file, struct address_space *mapping,
316 loff_t pos, unsigned len,
317 struct page **pagep, void **fsdata)
318{
319 int ret;
320 pgoff_t index = pos >> PAGE_SHIFT;
321 struct page *page;
322 int once_thru = 0;
323
324 dfprintk(PAGECACHE, "NFS: write_begin(%pD2(%lu), %u@%lld)\n",
325 file, mapping->host->i_ino, len, (long long) pos);
326
327start:
328 page = grab_cache_page_write_begin(mapping, index);
329 if (!page)
330 return -ENOMEM;
331 *pagep = page;
332
333 ret = nfs_flush_incompatible(file, page);
334 if (ret) {
335 unlock_page(page);
336 put_page(page);
337 } else if (!once_thru &&
338 nfs_want_read_modify_write(file, page, pos, len)) {
339 once_thru = 1;
340 ret = nfs_read_folio(file, page_folio(page));
341 put_page(page);
342 if (!ret)
343 goto start;
344 }
345 return ret;
346}
347
348static int nfs_write_end(struct file *file, struct address_space *mapping,
349 loff_t pos, unsigned len, unsigned copied,
350 struct page *page, void *fsdata)
351{
352 unsigned offset = pos & (PAGE_SIZE - 1);
353 struct nfs_open_context *ctx = nfs_file_open_context(file);
354 int status;
355
356 dfprintk(PAGECACHE, "NFS: write_end(%pD2(%lu), %u@%lld)\n",
357 file, mapping->host->i_ino, len, (long long) pos);
358
359 /*
360 * Zero any uninitialised parts of the page, and then mark the page
361 * as up to date if it turns out that we're extending the file.
362 */
363 if (!PageUptodate(page)) {
364 unsigned pglen = nfs_page_length(page);
365 unsigned end = offset + copied;
366
367 if (pglen == 0) {
368 zero_user_segments(page, 0, offset,
369 end, PAGE_SIZE);
370 SetPageUptodate(page);
371 } else if (end >= pglen) {
372 zero_user_segment(page, end, PAGE_SIZE);
373 if (offset == 0)
374 SetPageUptodate(page);
375 } else
376 zero_user_segment(page, pglen, PAGE_SIZE);
377 }
378
379 status = nfs_updatepage(file, page, offset, copied);
380
381 unlock_page(page);
382 put_page(page);
383
384 if (status < 0)
385 return status;
386 NFS_I(mapping->host)->write_io += copied;
387
388 if (nfs_ctx_key_to_expire(ctx, mapping->host))
389 nfs_wb_all(mapping->host);
390
391 return copied;
392}
393
394/*
395 * Partially or wholly invalidate a page
396 * - Release the private state associated with a page if undergoing complete
397 * page invalidation
398 * - Called if either PG_private or PG_fscache is set on the page
399 * - Caller holds page lock
400 */
401static void nfs_invalidate_folio(struct folio *folio, size_t offset,
402 size_t length)
403{
404 dfprintk(PAGECACHE, "NFS: invalidate_folio(%lu, %zu, %zu)\n",
405 folio->index, offset, length);
406
407 if (offset != 0 || length < folio_size(folio))
408 return;
409 /* Cancel any unstarted writes on this page */
410 nfs_wb_folio_cancel(folio->mapping->host, folio);
411 folio_wait_fscache(folio);
412}
413
414/*
415 * Attempt to release the private state associated with a folio
416 * - Called if either private or fscache flags are set on the folio
417 * - Caller holds folio lock
418 * - Return true (may release folio) or false (may not)
419 */
420static bool nfs_release_folio(struct folio *folio, gfp_t gfp)
421{
422 dfprintk(PAGECACHE, "NFS: release_folio(%p)\n", folio);
423
424 /* If the private flag is set, then the folio is not freeable */
425 if (folio_test_private(folio))
426 return false;
427 return nfs_fscache_release_folio(folio, gfp);
428}
429
430static void nfs_check_dirty_writeback(struct folio *folio,
431 bool *dirty, bool *writeback)
432{
433 struct nfs_inode *nfsi;
434 struct address_space *mapping = folio->mapping;
435
436 /*
437 * Check if an unstable folio is currently being committed and
438 * if so, have the VM treat it as if the folio is under writeback
439 * so it will not block due to folios that will shortly be freeable.
440 */
441 nfsi = NFS_I(mapping->host);
442 if (atomic_read(&nfsi->commit_info.rpcs_out)) {
443 *writeback = true;
444 return;
445 }
446
447 /*
448 * If the private flag is set, then the folio is not freeable
449 * and as the inode is not being committed, it's not going to
450 * be cleaned in the near future so treat it as dirty
451 */
452 if (folio_test_private(folio))
453 *dirty = true;
454}
455
456/*
457 * Attempt to clear the private state associated with a page when an error
458 * occurs that requires the cached contents of an inode to be written back or
459 * destroyed
460 * - Called if either PG_private or fscache is set on the page
461 * - Caller holds page lock
462 * - Return 0 if successful, -error otherwise
463 */
464static int nfs_launder_folio(struct folio *folio)
465{
466 struct inode *inode = folio->mapping->host;
467
468 dfprintk(PAGECACHE, "NFS: launder_folio(%ld, %llu)\n",
469 inode->i_ino, folio_pos(folio));
470
471 folio_wait_fscache(folio);
472 return nfs_wb_page(inode, &folio->page);
473}
474
475static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file,
476 sector_t *span)
477{
478 unsigned long blocks;
479 long long isize;
480 int ret;
481 struct inode *inode = file_inode(file);
482 struct rpc_clnt *clnt = NFS_CLIENT(inode);
483 struct nfs_client *cl = NFS_SERVER(inode)->nfs_client;
484
485 spin_lock(&inode->i_lock);
486 blocks = inode->i_blocks;
487 isize = inode->i_size;
488 spin_unlock(&inode->i_lock);
489 if (blocks*512 < isize) {
490 pr_warn("swap activate: swapfile has holes\n");
491 return -EINVAL;
492 }
493
494 ret = rpc_clnt_swap_activate(clnt);
495 if (ret)
496 return ret;
497 ret = add_swap_extent(sis, 0, sis->max, 0);
498 if (ret < 0) {
499 rpc_clnt_swap_deactivate(clnt);
500 return ret;
501 }
502
503 *span = sis->pages;
504
505 if (cl->rpc_ops->enable_swap)
506 cl->rpc_ops->enable_swap(inode);
507
508 sis->flags |= SWP_FS_OPS;
509 return ret;
510}
511
512static void nfs_swap_deactivate(struct file *file)
513{
514 struct inode *inode = file_inode(file);
515 struct rpc_clnt *clnt = NFS_CLIENT(inode);
516 struct nfs_client *cl = NFS_SERVER(inode)->nfs_client;
517
518 rpc_clnt_swap_deactivate(clnt);
519 if (cl->rpc_ops->disable_swap)
520 cl->rpc_ops->disable_swap(file_inode(file));
521}
522
523const struct address_space_operations nfs_file_aops = {
524 .read_folio = nfs_read_folio,
525 .readahead = nfs_readahead,
526 .dirty_folio = filemap_dirty_folio,
527 .writepage = nfs_writepage,
528 .writepages = nfs_writepages,
529 .write_begin = nfs_write_begin,
530 .write_end = nfs_write_end,
531 .invalidate_folio = nfs_invalidate_folio,
532 .release_folio = nfs_release_folio,
533 .migrate_folio = nfs_migrate_folio,
534 .launder_folio = nfs_launder_folio,
535 .is_dirty_writeback = nfs_check_dirty_writeback,
536 .error_remove_page = generic_error_remove_page,
537 .swap_activate = nfs_swap_activate,
538 .swap_deactivate = nfs_swap_deactivate,
539 .swap_rw = nfs_swap_rw,
540};
541
542/*
543 * Notification that a PTE pointing to an NFS page is about to be made
544 * writable, implying that someone is about to modify the page through a
545 * shared-writable mapping
546 */
547static vm_fault_t nfs_vm_page_mkwrite(struct vm_fault *vmf)
548{
549 struct page *page = vmf->page;
550 struct file *filp = vmf->vma->vm_file;
551 struct inode *inode = file_inode(filp);
552 unsigned pagelen;
553 vm_fault_t ret = VM_FAULT_NOPAGE;
554 struct address_space *mapping;
555
556 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%pD2(%lu), offset %lld)\n",
557 filp, filp->f_mapping->host->i_ino,
558 (long long)page_offset(page));
559
560 sb_start_pagefault(inode->i_sb);
561
562 /* make sure the cache has finished storing the page */
563 if (PageFsCache(page) &&
564 wait_on_page_fscache_killable(vmf->page) < 0) {
565 ret = VM_FAULT_RETRY;
566 goto out;
567 }
568
569 wait_on_bit_action(&NFS_I(inode)->flags, NFS_INO_INVALIDATING,
570 nfs_wait_bit_killable,
571 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
572
573 lock_page(page);
574 mapping = page_file_mapping(page);
575 if (mapping != inode->i_mapping)
576 goto out_unlock;
577
578 wait_on_page_writeback(page);
579
580 pagelen = nfs_page_length(page);
581 if (pagelen == 0)
582 goto out_unlock;
583
584 ret = VM_FAULT_LOCKED;
585 if (nfs_flush_incompatible(filp, page) == 0 &&
586 nfs_updatepage(filp, page, 0, pagelen) == 0)
587 goto out;
588
589 ret = VM_FAULT_SIGBUS;
590out_unlock:
591 unlock_page(page);
592out:
593 sb_end_pagefault(inode->i_sb);
594 return ret;
595}
596
597static const struct vm_operations_struct nfs_file_vm_ops = {
598 .fault = filemap_fault,
599 .map_pages = filemap_map_pages,
600 .page_mkwrite = nfs_vm_page_mkwrite,
601};
602
603ssize_t nfs_file_write(struct kiocb *iocb, struct iov_iter *from)
604{
605 struct file *file = iocb->ki_filp;
606 struct inode *inode = file_inode(file);
607 unsigned int mntflags = NFS_SERVER(inode)->flags;
608 ssize_t result, written;
609 errseq_t since;
610 int error;
611
612 result = nfs_key_timeout_notify(file, inode);
613 if (result)
614 return result;
615
616 if (iocb->ki_flags & IOCB_DIRECT)
617 return nfs_file_direct_write(iocb, from, false);
618
619 dprintk("NFS: write(%pD2, %zu@%Ld)\n",
620 file, iov_iter_count(from), (long long) iocb->ki_pos);
621
622 if (IS_SWAPFILE(inode))
623 goto out_swapfile;
624 /*
625 * O_APPEND implies that we must revalidate the file length.
626 */
627 if (iocb->ki_flags & IOCB_APPEND || iocb->ki_pos > i_size_read(inode)) {
628 result = nfs_revalidate_file_size(inode, file);
629 if (result)
630 return result;
631 }
632
633 nfs_clear_invalid_mapping(file->f_mapping);
634
635 since = filemap_sample_wb_err(file->f_mapping);
636 nfs_start_io_write(inode);
637 result = generic_write_checks(iocb, from);
638 if (result > 0) {
639 current->backing_dev_info = inode_to_bdi(inode);
640 result = generic_perform_write(iocb, from);
641 current->backing_dev_info = NULL;
642 }
643 nfs_end_io_write(inode);
644 if (result <= 0)
645 goto out;
646
647 written = result;
648 iocb->ki_pos += written;
649 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
650
651 if (mntflags & NFS_MOUNT_WRITE_EAGER) {
652 result = filemap_fdatawrite_range(file->f_mapping,
653 iocb->ki_pos - written,
654 iocb->ki_pos - 1);
655 if (result < 0)
656 goto out;
657 }
658 if (mntflags & NFS_MOUNT_WRITE_WAIT) {
659 filemap_fdatawait_range(file->f_mapping,
660 iocb->ki_pos - written,
661 iocb->ki_pos - 1);
662 }
663 result = generic_write_sync(iocb, written);
664 if (result < 0)
665 return result;
666
667out:
668 /* Return error values */
669 error = filemap_check_wb_err(file->f_mapping, since);
670 switch (error) {
671 default:
672 break;
673 case -EDQUOT:
674 case -EFBIG:
675 case -ENOSPC:
676 nfs_wb_all(inode);
677 error = file_check_and_advance_wb_err(file);
678 if (error < 0)
679 result = error;
680 }
681 return result;
682
683out_swapfile:
684 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
685 return -ETXTBSY;
686}
687EXPORT_SYMBOL_GPL(nfs_file_write);
688
689static int
690do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
691{
692 struct inode *inode = filp->f_mapping->host;
693 int status = 0;
694 unsigned int saved_type = fl->fl_type;
695
696 /* Try local locking first */
697 posix_test_lock(filp, fl);
698 if (fl->fl_type != F_UNLCK) {
699 /* found a conflict */
700 goto out;
701 }
702 fl->fl_type = saved_type;
703
704 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
705 goto out_noconflict;
706
707 if (is_local)
708 goto out_noconflict;
709
710 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
711out:
712 return status;
713out_noconflict:
714 fl->fl_type = F_UNLCK;
715 goto out;
716}
717
718static int
719do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
720{
721 struct inode *inode = filp->f_mapping->host;
722 struct nfs_lock_context *l_ctx;
723 int status;
724
725 /*
726 * Flush all pending writes before doing anything
727 * with locks..
728 */
729 nfs_wb_all(inode);
730
731 l_ctx = nfs_get_lock_context(nfs_file_open_context(filp));
732 if (!IS_ERR(l_ctx)) {
733 status = nfs_iocounter_wait(l_ctx);
734 nfs_put_lock_context(l_ctx);
735 /* NOTE: special case
736 * If we're signalled while cleaning up locks on process exit, we
737 * still need to complete the unlock.
738 */
739 if (status < 0 && !(fl->fl_flags & FL_CLOSE))
740 return status;
741 }
742
743 /*
744 * Use local locking if mounted with "-onolock" or with appropriate
745 * "-olocal_lock="
746 */
747 if (!is_local)
748 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
749 else
750 status = locks_lock_file_wait(filp, fl);
751 return status;
752}
753
754static int
755do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
756{
757 struct inode *inode = filp->f_mapping->host;
758 int status;
759
760 /*
761 * Flush all pending writes before doing anything
762 * with locks..
763 */
764 status = nfs_sync_mapping(filp->f_mapping);
765 if (status != 0)
766 goto out;
767
768 /*
769 * Use local locking if mounted with "-onolock" or with appropriate
770 * "-olocal_lock="
771 */
772 if (!is_local)
773 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
774 else
775 status = locks_lock_file_wait(filp, fl);
776 if (status < 0)
777 goto out;
778
779 /*
780 * Invalidate cache to prevent missing any changes. If
781 * the file is mapped, clear the page cache as well so
782 * those mappings will be loaded.
783 *
784 * This makes locking act as a cache coherency point.
785 */
786 nfs_sync_mapping(filp->f_mapping);
787 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) {
788 nfs_zap_caches(inode);
789 if (mapping_mapped(filp->f_mapping))
790 nfs_revalidate_mapping(inode, filp->f_mapping);
791 }
792out:
793 return status;
794}
795
796/*
797 * Lock a (portion of) a file
798 */
799int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
800{
801 struct inode *inode = filp->f_mapping->host;
802 int ret = -ENOLCK;
803 int is_local = 0;
804
805 dprintk("NFS: lock(%pD2, t=%x, fl=%x, r=%lld:%lld)\n",
806 filp, fl->fl_type, fl->fl_flags,
807 (long long)fl->fl_start, (long long)fl->fl_end);
808
809 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
810
811 if (fl->fl_flags & FL_RECLAIM)
812 return -ENOGRACE;
813
814 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
815 is_local = 1;
816
817 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
818 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
819 if (ret < 0)
820 goto out_err;
821 }
822
823 if (IS_GETLK(cmd))
824 ret = do_getlk(filp, cmd, fl, is_local);
825 else if (fl->fl_type == F_UNLCK)
826 ret = do_unlk(filp, cmd, fl, is_local);
827 else
828 ret = do_setlk(filp, cmd, fl, is_local);
829out_err:
830 return ret;
831}
832EXPORT_SYMBOL_GPL(nfs_lock);
833
834/*
835 * Lock a (portion of) a file
836 */
837int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
838{
839 struct inode *inode = filp->f_mapping->host;
840 int is_local = 0;
841
842 dprintk("NFS: flock(%pD2, t=%x, fl=%x)\n",
843 filp, fl->fl_type, fl->fl_flags);
844
845 if (!(fl->fl_flags & FL_FLOCK))
846 return -ENOLCK;
847
848 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
849 is_local = 1;
850
851 /* We're simulating flock() locks using posix locks on the server */
852 if (fl->fl_type == F_UNLCK)
853 return do_unlk(filp, cmd, fl, is_local);
854 return do_setlk(filp, cmd, fl, is_local);
855}
856EXPORT_SYMBOL_GPL(nfs_flock);
857
858const struct file_operations nfs_file_operations = {
859 .llseek = nfs_file_llseek,
860 .read_iter = nfs_file_read,
861 .write_iter = nfs_file_write,
862 .mmap = nfs_file_mmap,
863 .open = nfs_file_open,
864 .flush = nfs_file_flush,
865 .release = nfs_file_release,
866 .fsync = nfs_file_fsync,
867 .lock = nfs_lock,
868 .flock = nfs_flock,
869 .splice_read = generic_file_splice_read,
870 .splice_write = iter_file_splice_write,
871 .check_flags = nfs_check_flags,
872 .setlease = simple_nosetlease,
873};
874EXPORT_SYMBOL_GPL(nfs_file_operations);