blob: aa9b709fd328d7178cd1c4bdb417fb6f454472af [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/pagemap.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040028#include <linux/aio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090029#include <linux/gfp.h>
Trond Myklebustb608b282010-07-30 15:31:54 -040030#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031
32#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34#include "delegation.h"
Trond Myklebust94387fb2007-07-22 17:09:05 -040035#include "internal.h"
Chuck Lever91d5b472006-03-20 13:44:14 -050036#include "iostat.h"
David Howells545db452009-04-03 16:42:44 +010037#include "fscache.h"
Benny Halevye5e94012010-10-20 00:18:01 -040038#include "pnfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#define NFSDBG_FACILITY NFSDBG_FILE
41
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +040042static const struct vm_operations_struct nfs_file_vm_ops;
Trond Myklebust94387fb2007-07-22 17:09:05 -040043
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080044const struct inode_operations nfs_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 .permission = nfs_permission,
46 .getattr = nfs_getattr,
47 .setattr = nfs_setattr,
48};
49
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000050#ifdef CONFIG_NFS_V3
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080051const struct inode_operations nfs3_file_inode_operations = {
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000052 .permission = nfs_permission,
53 .getattr = nfs_getattr,
54 .setattr = nfs_setattr,
55 .listxattr = nfs3_listxattr,
56 .getxattr = nfs3_getxattr,
57 .setxattr = nfs3_setxattr,
58 .removexattr = nfs3_removexattr,
59};
60#endif /* CONFIG_NFS_v3 */
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062/* Hack for future NFS swap support */
63#ifndef IS_SWAPFILE
64# define IS_SWAPFILE(inode) (0)
65#endif
66
67static int nfs_check_flags(int flags)
68{
69 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
70 return -EINVAL;
71
72 return 0;
73}
74
75/*
76 * Open file
77 */
78static int
79nfs_file_open(struct inode *inode, struct file *filp)
80{
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 int res;
82
Chuck Lever6da24bc2008-06-11 17:55:58 -040083 dprintk("NFS: open file(%s/%s)\n",
Chuck Levercc0dd2d2008-06-11 17:55:42 -040084 filp->f_path.dentry->d_parent->d_name.name,
85 filp->f_path.dentry->d_name.name);
86
Chuck Leverc2459dc2010-02-01 14:17:14 -050087 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 res = nfs_check_flags(filp->f_flags);
89 if (res)
90 return res;
91
Trond Myklebust46cb6502008-06-11 16:32:46 -040092 res = nfs_open(inode, filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093 return res;
94}
95
96static int
97nfs_file_release(struct inode *inode, struct file *filp)
98{
Chuck Lever6da24bc2008-06-11 17:55:58 -040099 dprintk("NFS: release(%s/%s)\n",
Rakib Mullick6f276e42011-11-01 12:16:15 +0600100 filp->f_path.dentry->d_parent->d_name.name,
101 filp->f_path.dentry->d_name.name);
Chuck Lever6da24bc2008-06-11 17:55:58 -0400102
Chuck Lever91d5b472006-03-20 13:44:14 -0500103 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
Trond Myklebust46cb6502008-06-11 16:32:46 -0400104 return nfs_release(inode, filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}
106
Trond Myklebust980802e2005-06-13 11:14:01 -0400107/**
108 * nfs_revalidate_size - Revalidate the file size
109 * @inode - pointer to inode struct
110 * @file - pointer to struct file
111 *
112 * Revalidates the file length. This is basically a wrapper around
113 * nfs_revalidate_inode() that takes into account the fact that we may
114 * have cached writes (in which case we don't care about the server's
115 * idea of what the file length is), or O_DIRECT (in which case we
116 * shouldn't trust the cache).
117 */
118static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
119{
120 struct nfs_server *server = NFS_SERVER(inode);
121 struct nfs_inode *nfsi = NFS_I(inode);
122
Trond Myklebustd7cf8dd2010-04-16 16:42:46 -0400123 if (nfs_have_delegated_attributes(inode))
124 goto out_noreval;
125
Trond Myklebust980802e2005-06-13 11:14:01 -0400126 if (filp->f_flags & O_DIRECT)
127 goto force_reval;
Trond Myklebustd7cf8dd2010-04-16 16:42:46 -0400128 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
129 goto force_reval;
130 if (nfs_attribute_timeout(inode))
131 goto force_reval;
132out_noreval:
133 return 0;
Trond Myklebust980802e2005-06-13 11:14:01 -0400134force_reval:
135 return __nfs_revalidate_inode(server, inode);
136}
137
138static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
139{
Chuck Lever6da24bc2008-06-11 17:55:58 -0400140 dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
Chuck Leverb84e06c2008-06-11 17:55:34 -0400141 filp->f_path.dentry->d_parent->d_name.name,
142 filp->f_path.dentry->d_name.name,
143 offset, origin);
144
Josef Bacik06222e42011-07-18 13:21:38 -0400145 /*
146 * origin == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
147 * the cached file length
148 */
Trond Myklebust6c529612011-12-15 18:38:10 -0500149 if (origin != SEEK_SET && origin != SEEK_CUR) {
Trond Myklebust980802e2005-06-13 11:14:01 -0400150 struct inode *inode = filp->f_mapping->host;
Trond Myklebustd5e66342008-09-23 17:28:35 -0400151
Trond Myklebust980802e2005-06-13 11:14:01 -0400152 int retval = nfs_revalidate_file_size(inode, filp);
153 if (retval < 0)
154 return (loff_t)retval;
Andi Kleen79835a712011-09-15 16:06:52 -0700155 }
Trond Myklebustd5e66342008-09-23 17:28:35 -0400156
Andi Kleen79835a712011-09-15 16:06:52 -0700157 return generic_file_llseek(filp, offset, origin);
Trond Myklebust980802e2005-06-13 11:14:01 -0400158}
159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160/*
161 * Flush all dirty pages, and check for write errors.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 */
163static int
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700164nfs_file_flush(struct file *file, fl_owner_t id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Chuck Lever6da24bc2008-06-11 17:55:58 -0400166 struct dentry *dentry = file->f_path.dentry;
167 struct inode *inode = dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Chuck Lever6da24bc2008-06-11 17:55:58 -0400169 dprintk("NFS: flush(%s/%s)\n",
170 dentry->d_parent->d_name.name,
171 dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Chuck Leverc2459dc2010-02-01 14:17:14 -0500173 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if ((file->f_mode & FMODE_WRITE) == 0)
175 return 0;
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400176
Trond Myklebust7fe5c392009-03-19 15:35:50 -0400177 /* Flush writes to the server and return any errors */
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400178 return vfs_fsync(file, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179}
180
181static ssize_t
Badari Pulavarty027445c2006-09-30 23:28:46 -0700182nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
183 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800185 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 struct inode * inode = dentry->d_inode;
187 ssize_t result;
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 if (iocb->ki_filp->f_flags & O_DIRECT)
Badari Pulavarty027445c2006-09-30 23:28:46 -0700190 return nfs_file_direct_read(iocb, iov, nr_segs, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191
Chuck Lever6da24bc2008-06-11 17:55:58 -0400192 dprintk("NFS: read(%s/%s, %lu@%lu)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 dentry->d_parent->d_name.name, dentry->d_name.name,
Rakib Mullick6f276e42011-11-01 12:16:15 +0600194 (unsigned long) iov_length(iov, nr_segs), (unsigned long) pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Trond Myklebust44b11872006-05-25 01:40:59 -0400196 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
Chuck Lever4184dcf2010-02-01 14:17:23 -0500197 if (!result) {
Badari Pulavarty027445c2006-09-30 23:28:46 -0700198 result = generic_file_aio_read(iocb, iov, nr_segs, pos);
Chuck Lever4184dcf2010-02-01 14:17:23 -0500199 if (result > 0)
200 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
201 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 return result;
203}
204
205static ssize_t
Jens Axboef0930ff2007-06-01 11:51:43 +0200206nfs_file_splice_read(struct file *filp, loff_t *ppos,
207 struct pipe_inode_info *pipe, size_t count,
208 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800210 struct dentry *dentry = filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 struct inode *inode = dentry->d_inode;
212 ssize_t res;
213
Chuck Lever6da24bc2008-06-11 17:55:58 -0400214 dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 dentry->d_parent->d_name.name, dentry->d_name.name,
216 (unsigned long) count, (unsigned long long) *ppos);
217
Trond Myklebust44b11872006-05-25 01:40:59 -0400218 res = nfs_revalidate_mapping(inode, filp->f_mapping);
Chuck Leveraa2f1ef2010-02-01 14:17:32 -0500219 if (!res) {
Jens Axboef0930ff2007-06-01 11:51:43 +0200220 res = generic_file_splice_read(filp, ppos, pipe, count, flags);
Chuck Leveraa2f1ef2010-02-01 14:17:32 -0500221 if (res > 0)
222 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
223 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return res;
225}
226
227static int
228nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
229{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800230 struct dentry *dentry = file->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 struct inode *inode = dentry->d_inode;
232 int status;
233
Chuck Lever6da24bc2008-06-11 17:55:58 -0400234 dprintk("NFS: mmap(%s/%s)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 dentry->d_parent->d_name.name, dentry->d_name.name);
236
Trond Myklebuste1ebfd32009-03-11 14:37:54 -0400237 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
238 * so we call that before revalidating the mapping
239 */
240 status = generic_file_mmap(file, vma);
Trond Myklebust94387fb2007-07-22 17:09:05 -0400241 if (!status) {
242 vma->vm_ops = &nfs_file_vm_ops;
Trond Myklebuste1ebfd32009-03-11 14:37:54 -0400243 status = nfs_revalidate_mapping(inode, file->f_mapping);
Trond Myklebust94387fb2007-07-22 17:09:05 -0400244 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 return status;
246}
247
248/*
249 * Flush any dirty pages for this process, and check for write errors.
250 * The return status from this call provides a reliable indication of
251 * whether any write errors occurred for this process.
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400252 *
253 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
254 * disk, but it retrieves and clears ctx->error after synching, despite
255 * the two being set at the same time in nfs_context_set_write_error().
256 * This is because the former is used to notify the _next_ call to
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300257 * nfs_file_write() that a write error occurred, and hence cause it to
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400258 * fall back to doing a synchronous write.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 */
260static int
Josef Bacik02c24a82011-07-16 20:44:56 -0400261nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200263 struct dentry *dentry = file->f_path.dentry;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400264 struct nfs_open_context *ctx = nfs_file_open_context(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 struct inode *inode = dentry->d_inode;
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400266 int have_error, status;
267 int ret = 0;
268
Chuck Lever6da24bc2008-06-11 17:55:58 -0400269 dprintk("NFS: fsync file(%s/%s) datasync %d\n",
Chuck Lever54917782008-05-27 16:29:07 -0400270 dentry->d_parent->d_name.name, dentry->d_name.name,
271 datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272
Josef Bacik02c24a82011-07-16 20:44:56 -0400273 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
Josef Bacik02c24a82011-07-16 20:44:56 -0400274 mutex_lock(&inode->i_mutex);
275
Chuck Lever91d5b472006-03-20 13:44:14 -0500276 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400277 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
278 status = nfs_commit_inode(inode, FLUSH_SYNC);
NeilBrown2edb6bc2011-11-16 11:46:31 +1100279 if (status >= 0 && ret < 0)
280 status = ret;
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400281 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
282 if (have_error)
283 ret = xchg(&ctx->error, 0);
J. R. Okajima07020992010-08-11 13:10:16 -0400284 if (!ret && status < 0)
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400285 ret = status;
Andy Adamson863a3c62011-03-23 13:27:54 +0000286 if (!ret && !datasync)
287 /* application has asked for meta-data sync */
Andy Adamsonef311532011-03-12 02:58:10 -0500288 ret = pnfs_layoutcommit_inode(inode, true);
Josef Bacik02c24a82011-07-16 20:44:56 -0400289 mutex_unlock(&inode->i_mutex);
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400290 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291}
292
293/*
Peter Staubach38c73042009-08-10 08:54:16 -0400294 * Decide whether a read/modify/write cycle may be more efficient
295 * then a modify/write/read cycle when writing to a page in the
296 * page cache.
297 *
298 * The modify/write/read cycle may occur if a page is read before
299 * being completely filled by the writer. In this situation, the
300 * page must be completely written to stable storage on the server
301 * before it can be refilled by reading in the page from the server.
302 * This can lead to expensive, small, FILE_SYNC mode writes being
303 * done.
304 *
305 * It may be more efficient to read the page first if the file is
306 * open for reading in addition to writing, the page is not marked
307 * as Uptodate, it is not dirty or waiting to be committed,
308 * indicating that it was previously allocated and then modified,
309 * that there were valid bytes of data in that range of the file,
310 * and that the new data won't completely replace the old data in
311 * that range of the file.
312 */
313static int nfs_want_read_modify_write(struct file *file, struct page *page,
314 loff_t pos, unsigned len)
315{
316 unsigned int pglen = nfs_page_length(page);
317 unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
318 unsigned int end = offset + len;
319
320 if ((file->f_mode & FMODE_READ) && /* open for read? */
321 !PageUptodate(page) && /* Uptodate? */
322 !PagePrivate(page) && /* i/o request already? */
323 pglen && /* valid bytes of file? */
324 (end < pglen || offset)) /* replace all valid bytes? */
325 return 1;
326 return 0;
327}
328
329/*
Nick Piggin4899f9c2007-10-16 01:25:16 -0700330 * This does the "real" work of the write. We must allocate and lock the
331 * page to be sent back to the generic routine, which then copies the
332 * data from user space.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 *
334 * If the writer ends up delaying the write, the writer needs to
335 * increment the page use counts until he is done with the page.
336 */
Nick Piggin4899f9c2007-10-16 01:25:16 -0700337static int nfs_write_begin(struct file *file, struct address_space *mapping,
338 loff_t pos, unsigned len, unsigned flags,
339 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340{
Nick Piggin4899f9c2007-10-16 01:25:16 -0700341 int ret;
Peter Staubach38c73042009-08-10 08:54:16 -0400342 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
Nick Piggin4899f9c2007-10-16 01:25:16 -0700343 struct page *page;
Peter Staubach38c73042009-08-10 08:54:16 -0400344 int once_thru = 0;
Nick Piggin4899f9c2007-10-16 01:25:16 -0700345
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400346 dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
347 file->f_path.dentry->d_parent->d_name.name,
348 file->f_path.dentry->d_name.name,
349 mapping->host->i_ino, len, (long long) pos);
350
Peter Staubach38c73042009-08-10 08:54:16 -0400351start:
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400352 /*
353 * Prevent starvation issues if someone is doing a consistency
354 * sync-to-disk
355 */
356 ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
357 nfs_wait_bit_killable, TASK_KILLABLE);
358 if (ret)
359 return ret;
360
Nick Piggin54566b22009-01-04 12:00:53 -0800361 page = grab_cache_page_write_begin(mapping, index, flags);
Nick Piggin4899f9c2007-10-16 01:25:16 -0700362 if (!page)
363 return -ENOMEM;
364 *pagep = page;
365
366 ret = nfs_flush_incompatible(file, page);
367 if (ret) {
368 unlock_page(page);
369 page_cache_release(page);
Peter Staubach38c73042009-08-10 08:54:16 -0400370 } else if (!once_thru &&
371 nfs_want_read_modify_write(file, page, pos, len)) {
372 once_thru = 1;
373 ret = nfs_readpage(file, page);
374 page_cache_release(page);
375 if (!ret)
376 goto start;
Nick Piggin4899f9c2007-10-16 01:25:16 -0700377 }
378 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379}
380
Nick Piggin4899f9c2007-10-16 01:25:16 -0700381static int nfs_write_end(struct file *file, struct address_space *mapping,
382 loff_t pos, unsigned len, unsigned copied,
383 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
Nick Piggin4899f9c2007-10-16 01:25:16 -0700385 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
386 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400388 dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
389 file->f_path.dentry->d_parent->d_name.name,
390 file->f_path.dentry->d_name.name,
391 mapping->host->i_ino, len, (long long) pos);
392
Trond Myklebustefc91ed2008-06-10 18:31:00 -0400393 /*
394 * Zero any uninitialised parts of the page, and then mark the page
395 * as up to date if it turns out that we're extending the file.
396 */
397 if (!PageUptodate(page)) {
398 unsigned pglen = nfs_page_length(page);
399 unsigned end = offset + len;
400
401 if (pglen == 0) {
402 zero_user_segments(page, 0, offset,
403 end, PAGE_CACHE_SIZE);
404 SetPageUptodate(page);
405 } else if (end >= pglen) {
406 zero_user_segment(page, end, PAGE_CACHE_SIZE);
407 if (offset == 0)
408 SetPageUptodate(page);
409 } else
410 zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
411 }
412
Nick Piggin4899f9c2007-10-16 01:25:16 -0700413 status = nfs_updatepage(file, page, offset, copied);
Nick Piggin4899f9c2007-10-16 01:25:16 -0700414
415 unlock_page(page);
416 page_cache_release(page);
417
Chuck Lever3d509e52007-12-20 14:55:04 -0500418 if (status < 0)
419 return status;
420 return copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421}
422
David Howells6b9b3512009-04-03 16:42:41 +0100423/*
424 * Partially or wholly invalidate a page
425 * - Release the private state associated with a page if undergoing complete
426 * page invalidation
David Howells545db452009-04-03 16:42:44 +0100427 * - Called if either PG_private or PG_fscache is set on the page
David Howells6b9b3512009-04-03 16:42:41 +0100428 * - Caller holds page lock
429 */
NeilBrown2ff28e22006-03-26 01:37:18 -0800430static void nfs_invalidate_page(struct page *page, unsigned long offset)
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500431{
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400432 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
433
Trond Myklebust1c759502006-10-09 16:18:38 -0400434 if (offset != 0)
435 return;
Trond Myklebustd2ccddf2006-05-31 01:13:38 -0400436 /* Cancel any unstarted writes on this page */
Trond Myklebust1b3b4a12007-08-28 10:29:36 -0400437 nfs_wb_page_cancel(page->mapping->host, page);
David Howells545db452009-04-03 16:42:44 +0100438
439 nfs_fscache_invalidate_page(page, page->mapping->host);
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500440}
441
David Howells6b9b3512009-04-03 16:42:41 +0100442/*
443 * Attempt to release the private state associated with a page
David Howells545db452009-04-03 16:42:44 +0100444 * - Called if either PG_private or PG_fscache is set on the page
David Howells6b9b3512009-04-03 16:42:41 +0100445 * - Caller holds page lock
446 * - Return true (may release page) or false (may not)
447 */
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500448static int nfs_release_page(struct page *page, gfp_t gfp)
449{
Trond Myklebustb608b282010-07-30 15:31:54 -0400450 struct address_space *mapping = page->mapping;
451
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400452 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
453
Trond Myklebustd812e572010-03-19 13:55:17 -0400454 /* Only do I/O if gfp is a superset of GFP_KERNEL */
Trond Myklebustb608b282010-07-30 15:31:54 -0400455 if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
456 int how = FLUSH_SYNC;
457
458 /* Don't let kswapd deadlock waiting for OOM RPC calls */
459 if (current_is_kswapd())
460 how = 0;
461 nfs_commit_inode(mapping->host, how);
462 }
Trond Myklebuste3db7692007-01-10 23:15:39 -0800463 /* If PagePrivate() is set, then the page is not freeable */
David Howells545db452009-04-03 16:42:44 +0100464 if (PagePrivate(page))
465 return 0;
466 return nfs_fscache_release_page(page, gfp);
Trond Myklebuste3db7692007-01-10 23:15:39 -0800467}
468
David Howells6b9b3512009-04-03 16:42:41 +0100469/*
470 * Attempt to clear the private state associated with a page when an error
471 * occurs that requires the cached contents of an inode to be written back or
472 * destroyed
David Howells545db452009-04-03 16:42:44 +0100473 * - Called if either PG_private or fscache is set on the page
David Howells6b9b3512009-04-03 16:42:41 +0100474 * - Caller holds page lock
475 * - Return 0 if successful, -error otherwise
476 */
Trond Myklebuste3db7692007-01-10 23:15:39 -0800477static int nfs_launder_page(struct page *page)
478{
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400479 struct inode *inode = page->mapping->host;
David Howells545db452009-04-03 16:42:44 +0100480 struct nfs_inode *nfsi = NFS_I(inode);
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400481
482 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
483 inode->i_ino, (long long)page_offset(page));
484
David Howells545db452009-04-03 16:42:44 +0100485 nfs_fscache_wait_on_page_write(nfsi, page);
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400486 return nfs_wb_page(inode, page);
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500487}
488
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700489const struct address_space_operations nfs_file_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 .readpage = nfs_readpage,
491 .readpages = nfs_readpages,
Trond Myklebust9cccef92007-07-22 17:09:05 -0400492 .set_page_dirty = __set_page_dirty_nobuffers,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 .writepage = nfs_writepage,
494 .writepages = nfs_writepages,
Nick Piggin4899f9c2007-10-16 01:25:16 -0700495 .write_begin = nfs_write_begin,
496 .write_end = nfs_write_end,
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500497 .invalidatepage = nfs_invalidate_page,
498 .releasepage = nfs_release_page,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 .direct_IO = nfs_direct_IO,
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400500 .migratepage = nfs_migrate_page,
Trond Myklebuste3db7692007-01-10 23:15:39 -0800501 .launder_page = nfs_launder_page,
Andi Kleenf590f332009-09-16 11:50:17 +0200502 .error_remove_page = generic_error_remove_page,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503};
504
David Howells6b9b3512009-04-03 16:42:41 +0100505/*
506 * Notification that a PTE pointing to an NFS page is about to be made
507 * writable, implying that someone is about to modify the page through a
508 * shared-writable mapping
509 */
Nick Pigginc2ec1752009-03-31 15:23:21 -0700510static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Trond Myklebust94387fb2007-07-22 17:09:05 -0400511{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700512 struct page *page = vmf->page;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400513 struct file *filp = vma->vm_file;
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400514 struct dentry *dentry = filp->f_path.dentry;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400515 unsigned pagelen;
Trond Myklebustbc4866b2010-10-04 17:59:08 -0400516 int ret = VM_FAULT_NOPAGE;
Nick Piggin4899f9c2007-10-16 01:25:16 -0700517 struct address_space *mapping;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400518
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400519 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
520 dentry->d_parent->d_name.name, dentry->d_name.name,
521 filp->f_mapping->host->i_ino,
522 (long long)page_offset(page));
523
David Howells545db452009-04-03 16:42:44 +0100524 /* make sure the cache has finished storing the page */
525 nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);
526
Trond Myklebust94387fb2007-07-22 17:09:05 -0400527 lock_page(page);
Nick Piggin4899f9c2007-10-16 01:25:16 -0700528 mapping = page->mapping;
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400529 if (mapping != dentry->d_inode->i_mapping)
Trond Myklebust8b1f9ee2008-01-22 17:13:06 -0500530 goto out_unlock;
531
Trond Myklebust2aeb98f2012-01-17 22:04:26 -0500532 wait_on_page_writeback(page);
533
Trond Myklebust94387fb2007-07-22 17:09:05 -0400534 pagelen = nfs_page_length(page);
Trond Myklebust8b1f9ee2008-01-22 17:13:06 -0500535 if (pagelen == 0)
536 goto out_unlock;
537
Trond Myklebustbc4866b2010-10-04 17:59:08 -0400538 ret = VM_FAULT_LOCKED;
539 if (nfs_flush_incompatible(filp, page) == 0 &&
540 nfs_updatepage(filp, page, 0, pagelen) == 0)
541 goto out;
Trond Myklebust8b1f9ee2008-01-22 17:13:06 -0500542
Trond Myklebustbc4866b2010-10-04 17:59:08 -0400543 ret = VM_FAULT_SIGBUS;
Trond Myklebust8b1f9ee2008-01-22 17:13:06 -0500544out_unlock:
Trond Myklebust94387fb2007-07-22 17:09:05 -0400545 unlock_page(page);
Trond Myklebustbc4866b2010-10-04 17:59:08 -0400546out:
547 return ret;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400548}
549
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400550static const struct vm_operations_struct nfs_file_vm_ops = {
Trond Myklebust94387fb2007-07-22 17:09:05 -0400551 .fault = filemap_fault,
552 .page_mkwrite = nfs_vm_page_mkwrite,
553};
554
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400555static int nfs_need_sync_write(struct file *filp, struct inode *inode)
556{
557 struct nfs_open_context *ctx;
558
Christoph Hellwig6b2f3d12009-10-27 11:05:28 +0100559 if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400560 return 1;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400561 ctx = nfs_file_open_context(filp);
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400562 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags))
563 return 1;
564 return 0;
565}
566
Badari Pulavarty027445c2006-09-30 23:28:46 -0700567static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
568 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800570 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 struct inode * inode = dentry->d_inode;
Chuck Lever7e381172010-02-01 14:17:41 -0500572 unsigned long written = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 ssize_t result;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700574 size_t count = iov_length(iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 if (iocb->ki_filp->f_flags & O_DIRECT)
Badari Pulavarty027445c2006-09-30 23:28:46 -0700577 return nfs_file_direct_write(iocb, iov, nr_segs, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
Chuck Lever6da24bc2008-06-11 17:55:58 -0400579 dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 dentry->d_parent->d_name.name, dentry->d_name.name,
Chuck Lever6da24bc2008-06-11 17:55:58 -0400581 (unsigned long) count, (long long) pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582
583 result = -EBUSY;
584 if (IS_SWAPFILE(inode))
585 goto out_swapfile;
Trond Myklebust7d52e862005-06-22 17:16:30 +0000586 /*
587 * O_APPEND implies that we must revalidate the file length.
588 */
589 if (iocb->ki_filp->f_flags & O_APPEND) {
590 result = nfs_revalidate_file_size(inode, iocb->ki_filp);
591 if (result)
592 goto out;
Trond Myklebustfe51beec2005-06-22 17:16:30 +0000593 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
595 result = count;
596 if (!count)
597 goto out;
598
Badari Pulavarty027445c2006-09-30 23:28:46 -0700599 result = generic_file_aio_write(iocb, iov, nr_segs, pos);
Chuck Lever7e381172010-02-01 14:17:41 -0500600 if (result > 0)
601 written = result;
602
Christoph Hellwig6b2f3d12009-10-27 11:05:28 +0100603 /* Return error values for O_DSYNC and IS_SYNC() */
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400604 if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400605 int err = vfs_fsync(iocb->ki_filp, 0);
Trond Myklebust200baa22006-12-05 00:35:40 -0500606 if (err < 0)
607 result = err;
608 }
Chuck Lever7e381172010-02-01 14:17:41 -0500609 if (result > 0)
610 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611out:
612 return result;
613
614out_swapfile:
615 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
616 goto out;
617}
618
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700619static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
620 struct file *filp, loff_t *ppos,
621 size_t count, unsigned int flags)
622{
623 struct dentry *dentry = filp->f_path.dentry;
624 struct inode *inode = dentry->d_inode;
Chuck Lever7e381172010-02-01 14:17:41 -0500625 unsigned long written = 0;
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700626 ssize_t ret;
627
628 dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
629 dentry->d_parent->d_name.name, dentry->d_name.name,
630 (unsigned long) count, (unsigned long long) *ppos);
631
632 /*
633 * The combination of splice and an O_APPEND destination is disallowed.
634 */
635
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700636 ret = generic_file_splice_write(pipe, filp, ppos, count, flags);
Chuck Lever7e381172010-02-01 14:17:41 -0500637 if (ret > 0)
638 written = ret;
639
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700640 if (ret >= 0 && nfs_need_sync_write(filp, inode)) {
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400641 int err = vfs_fsync(filp, 0);
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700642 if (err < 0)
643 ret = err;
644 }
Chuck Lever7e381172010-02-01 14:17:41 -0500645 if (ret > 0)
646 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700647 return ret;
648}
649
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400650static int
651do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
653 struct inode *inode = filp->f_mapping->host;
654 int status = 0;
Sergey Vlasov21ac19d2010-11-28 21:04:05 +0000655 unsigned int saved_type = fl->fl_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Trond Myklebust039c4d72005-10-18 14:20:16 -0700657 /* Try local locking first */
J. Bruce Fields6d34ac12007-05-11 16:09:32 -0400658 posix_test_lock(filp, fl);
659 if (fl->fl_type != F_UNLCK) {
660 /* found a conflict */
Trond Myklebust039c4d72005-10-18 14:20:16 -0700661 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 }
Sergey Vlasov21ac19d2010-11-28 21:04:05 +0000663 fl->fl_type = saved_type;
Trond Myklebust039c4d72005-10-18 14:20:16 -0700664
665 if (nfs_have_delegation(inode, FMODE_READ))
666 goto out_noconflict;
667
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400668 if (is_local)
Trond Myklebust039c4d72005-10-18 14:20:16 -0700669 goto out_noconflict;
670
671 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
672out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 return status;
Trond Myklebust039c4d72005-10-18 14:20:16 -0700674out_noconflict:
675 fl->fl_type = F_UNLCK;
676 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677}
678
679static int do_vfs_lock(struct file *file, struct file_lock *fl)
680{
681 int res = 0;
682 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
683 case FL_POSIX:
684 res = posix_lock_file_wait(file, fl);
685 break;
686 case FL_FLOCK:
687 res = flock_lock_file_wait(file, fl);
688 break;
689 default:
690 BUG();
691 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 return res;
693}
694
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400695static int
696do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697{
698 struct inode *inode = filp->f_mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 int status;
700
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 /*
702 * Flush all pending writes before doing anything
703 * with locks..
704 */
Trond Myklebust29884df2005-12-13 16:13:54 -0500705 nfs_sync_mapping(filp->f_mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
707 /* NOTE: special case
708 * If we're signalled while cleaning up locks on process exit, we
709 * still need to complete the unlock.
710 */
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400711 /*
712 * Use local locking if mounted with "-onolock" or with appropriate
713 * "-olocal_lock="
714 */
715 if (!is_local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
717 else
718 status = do_vfs_lock(filp, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 return status;
720}
721
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400722static int
Ricardo Labiaga6b967242010-10-12 16:30:05 -0700723is_time_granular(struct timespec *ts) {
724 return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000));
725}
726
727static int
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400728do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729{
730 struct inode *inode = filp->f_mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 int status;
732
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 /*
734 * Flush all pending writes before doing anything
735 * with locks..
736 */
Trond Myklebust29884df2005-12-13 16:13:54 -0500737 status = nfs_sync_mapping(filp->f_mapping);
738 if (status != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 goto out;
740
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400741 /*
742 * Use local locking if mounted with "-onolock" or with appropriate
743 * "-olocal_lock="
744 */
745 if (!is_local)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
Trond Myklebustc4d7c402008-04-01 20:26:52 -0400747 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 status = do_vfs_lock(filp, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 if (status < 0)
750 goto out;
Ricardo Labiaga6b967242010-10-12 16:30:05 -0700751
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 /*
Ricardo Labiaga6b967242010-10-12 16:30:05 -0700753 * Revalidate the cache if the server has time stamps granular
754 * enough to detect subsecond changes. Otherwise, clear the
755 * cache to prevent missing any changes.
756 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 * This makes locking act as a cache coherency point.
758 */
Trond Myklebust29884df2005-12-13 16:13:54 -0500759 nfs_sync_mapping(filp->f_mapping);
Ricardo Labiaga6b967242010-10-12 16:30:05 -0700760 if (!nfs_have_delegation(inode, FMODE_READ)) {
761 if (is_time_granular(&NFS_SERVER(inode)->time_delta))
762 __nfs_revalidate_inode(NFS_SERVER(inode), inode);
763 else
764 nfs_zap_caches(inode);
765 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 return status;
768}
769
770/*
771 * Lock a (portion of) a file
772 */
773static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
774{
Chuck Lever6da24bc2008-06-11 17:55:58 -0400775 struct inode *inode = filp->f_mapping->host;
Trond Myklebust21162712008-05-20 19:34:39 -0400776 int ret = -ENOLCK;
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400777 int is_local = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
Chuck Lever6da24bc2008-06-11 17:55:58 -0400779 dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
780 filp->f_path.dentry->d_parent->d_name.name,
781 filp->f_path.dentry->d_name.name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 fl->fl_type, fl->fl_flags,
783 (long long)fl->fl_start, (long long)fl->fl_end);
Chuck Lever6da24bc2008-06-11 17:55:58 -0400784
Chuck Lever91d5b472006-03-20 13:44:14 -0500785 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
787 /* No mandatory locks over NFS */
Pavel Emelyanovdfad9442007-10-01 14:41:15 -0700788 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
Trond Myklebust21162712008-05-20 19:34:39 -0400789 goto out_err;
790
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400791 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL)
792 is_local = 1;
793
Trond Myklebust21162712008-05-20 19:34:39 -0400794 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
795 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
796 if (ret < 0)
797 goto out_err;
798 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799
800 if (IS_GETLK(cmd))
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400801 ret = do_getlk(filp, cmd, fl, is_local);
Trond Myklebust21162712008-05-20 19:34:39 -0400802 else if (fl->fl_type == F_UNLCK)
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400803 ret = do_unlk(filp, cmd, fl, is_local);
Trond Myklebust21162712008-05-20 19:34:39 -0400804 else
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400805 ret = do_setlk(filp, cmd, fl, is_local);
Trond Myklebust21162712008-05-20 19:34:39 -0400806out_err:
807 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808}
809
810/*
811 * Lock a (portion of) a file
812 */
813static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
814{
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400815 struct inode *inode = filp->f_mapping->host;
816 int is_local = 0;
817
Chuck Lever6da24bc2008-06-11 17:55:58 -0400818 dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
819 filp->f_path.dentry->d_parent->d_name.name,
820 filp->f_path.dentry->d_name.name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 fl->fl_type, fl->fl_flags);
822
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 if (!(fl->fl_flags & FL_FLOCK))
824 return -ENOLCK;
825
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400826 if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK)
827 is_local = 1;
828
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 /* We're simulating flock() locks using posix locks on the server */
830 fl->fl_owner = (fl_owner_t)filp;
831 fl->fl_start = 0;
832 fl->fl_end = OFFSET_MAX;
833
834 if (fl->fl_type == F_UNLCK)
Suresh Jayaraman5eebde22010-09-23 08:55:58 -0400835 return do_unlk(filp, cmd, fl, is_local);
836 return do_setlk(filp, cmd, fl, is_local);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837}
J. Bruce Fields370f6592007-06-08 15:23:34 -0400838
Chuck Lever6da24bc2008-06-11 17:55:58 -0400839/*
840 * There is no protocol support for leases, so we have no way to implement
841 * them correctly in the face of opens by other clients.
842 */
J. Bruce Fields370f6592007-06-08 15:23:34 -0400843static int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
844{
Chuck Lever6da24bc2008-06-11 17:55:58 -0400845 dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
846 file->f_path.dentry->d_parent->d_name.name,
847 file->f_path.dentry->d_name.name, arg);
J. Bruce Fields370f6592007-06-08 15:23:34 -0400848 return -EINVAL;
849}
Jeff Layton1788ea62011-11-04 13:31:21 -0400850
Jeff Layton04869582011-11-04 13:31:22 -0400851const struct file_operations nfs_file_operations = {
852 .llseek = nfs_file_llseek,
853 .read = do_sync_read,
854 .write = do_sync_write,
855 .aio_read = nfs_file_read,
856 .aio_write = nfs_file_write,
857 .mmap = nfs_file_mmap,
858 .open = nfs_file_open,
859 .flush = nfs_file_flush,
860 .release = nfs_file_release,
861 .fsync = nfs_file_fsync,
862 .lock = nfs_lock,
863 .flock = nfs_flock,
864 .splice_read = nfs_file_splice_read,
865 .splice_write = nfs_file_splice_write,
866 .check_flags = nfs_check_flags,
867 .setlease = nfs_setlease,
868};
869
Jeff Layton1788ea62011-11-04 13:31:21 -0400870#ifdef CONFIG_NFS_V4
871static int
872nfs4_file_open(struct inode *inode, struct file *filp)
873{
874 /*
875 * NFSv4 opens are handled in d_lookup and d_revalidate. If we get to
876 * this point, then something is very wrong
877 */
878 dprintk("NFS: %s called! inode=%p filp=%p\n", __func__, inode, filp);
879 return -ENOTDIR;
880}
881
882const struct file_operations nfs4_file_operations = {
883 .llseek = nfs_file_llseek,
884 .read = do_sync_read,
885 .write = do_sync_write,
886 .aio_read = nfs_file_read,
887 .aio_write = nfs_file_write,
888 .mmap = nfs_file_mmap,
889 .open = nfs4_file_open,
890 .flush = nfs_file_flush,
891 .release = nfs_file_release,
892 .fsync = nfs_file_fsync,
893 .lock = nfs_lock,
894 .flock = nfs_flock,
895 .splice_read = nfs_file_splice_read,
896 .splice_write = nfs_file_splice_write,
897 .check_flags = nfs_check_flags,
898 .setlease = nfs_setlease,
899};
900#endif /* CONFIG_NFS_V4 */