blob: 05bf3c0dc751d5d489b1c7be2cf594005caf1695 [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>
33#include <asm/system.h>
34
35#include "delegation.h"
Trond Myklebust94387fb2007-07-22 17:09:05 -040036#include "internal.h"
Chuck Lever91d5b472006-03-20 13:44:14 -050037#include "iostat.h"
David Howells545db452009-04-03 16:42:44 +010038#include "fscache.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#define NFSDBG_FACILITY NFSDBG_FILE
41
42static int nfs_file_open(struct inode *, struct file *);
43static int nfs_file_release(struct inode *, struct file *);
Trond Myklebust980802e2005-06-13 11:14:01 -040044static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045static int nfs_file_mmap(struct file *, struct vm_area_struct *);
Jens Axboef0930ff2007-06-01 11:51:43 +020046static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos,
47 struct pipe_inode_info *pipe,
48 size_t count, unsigned int flags);
Badari Pulavarty027445c2006-09-30 23:28:46 -070049static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov,
50 unsigned long nr_segs, loff_t pos);
Suresh Jayaramanbf40d342009-06-17 18:02:09 -070051static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
52 struct file *filp, loff_t *ppos,
53 size_t count, unsigned int flags);
Badari Pulavarty027445c2006-09-30 23:28:46 -070054static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov,
55 unsigned long nr_segs, loff_t pos);
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -070056static int nfs_file_flush(struct file *, fl_owner_t id);
Christoph Hellwig7ea80852010-05-26 17:53:25 +020057static int nfs_file_fsync(struct file *, int datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058static int nfs_check_flags(int flags);
59static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
60static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
J. Bruce Fields370f6592007-06-08 15:23:34 -040061static int nfs_setlease(struct file *file, long arg, struct file_lock **fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +040063static const struct vm_operations_struct nfs_file_vm_ops;
Trond Myklebust94387fb2007-07-22 17:09:05 -040064
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080065const struct file_operations nfs_file_operations = {
Trond Myklebust980802e2005-06-13 11:14:01 -040066 .llseek = nfs_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 .read = do_sync_read,
68 .write = do_sync_write,
Badari Pulavarty027445c2006-09-30 23:28:46 -070069 .aio_read = nfs_file_read,
70 .aio_write = nfs_file_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 .mmap = nfs_file_mmap,
72 .open = nfs_file_open,
73 .flush = nfs_file_flush,
74 .release = nfs_file_release,
Chuck Lever54917782008-05-27 16:29:07 -040075 .fsync = nfs_file_fsync,
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 .lock = nfs_lock,
77 .flock = nfs_flock,
Jens Axboef0930ff2007-06-01 11:51:43 +020078 .splice_read = nfs_file_splice_read,
Suresh Jayaramanbf40d342009-06-17 18:02:09 -070079 .splice_write = nfs_file_splice_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 .check_flags = nfs_check_flags,
J. Bruce Fields370f6592007-06-08 15:23:34 -040081 .setlease = nfs_setlease,
Linus Torvalds1da177e2005-04-16 15:20:36 -070082};
83
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080084const struct inode_operations nfs_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 .permission = nfs_permission,
86 .getattr = nfs_getattr,
87 .setattr = nfs_setattr,
88};
89
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000090#ifdef CONFIG_NFS_V3
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080091const struct inode_operations nfs3_file_inode_operations = {
Andreas Gruenbacherb7fa0552005-06-22 17:16:27 +000092 .permission = nfs_permission,
93 .getattr = nfs_getattr,
94 .setattr = nfs_setattr,
95 .listxattr = nfs3_listxattr,
96 .getxattr = nfs3_getxattr,
97 .setxattr = nfs3_setxattr,
98 .removexattr = nfs3_removexattr,
99};
100#endif /* CONFIG_NFS_v3 */
101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102/* Hack for future NFS swap support */
103#ifndef IS_SWAPFILE
104# define IS_SWAPFILE(inode) (0)
105#endif
106
107static int nfs_check_flags(int flags)
108{
109 if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT))
110 return -EINVAL;
111
112 return 0;
113}
114
115/*
116 * Open file
117 */
118static int
119nfs_file_open(struct inode *inode, struct file *filp)
120{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 int res;
122
Chuck Lever6da24bc2008-06-11 17:55:58 -0400123 dprintk("NFS: open file(%s/%s)\n",
Chuck Levercc0dd2d2008-06-11 17:55:42 -0400124 filp->f_path.dentry->d_parent->d_name.name,
125 filp->f_path.dentry->d_name.name);
126
Chuck Leverc2459dc2010-02-01 14:17:14 -0500127 nfs_inc_stats(inode, NFSIOS_VFSOPEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 res = nfs_check_flags(filp->f_flags);
129 if (res)
130 return res;
131
Trond Myklebust46cb6502008-06-11 16:32:46 -0400132 res = nfs_open(inode, filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 return res;
134}
135
136static int
137nfs_file_release(struct inode *inode, struct file *filp)
138{
Chuck Lever6da24bc2008-06-11 17:55:58 -0400139 struct dentry *dentry = filp->f_path.dentry;
140
141 dprintk("NFS: release(%s/%s)\n",
142 dentry->d_parent->d_name.name,
143 dentry->d_name.name);
144
Chuck Lever91d5b472006-03-20 13:44:14 -0500145 nfs_inc_stats(inode, NFSIOS_VFSRELEASE);
Trond Myklebust46cb6502008-06-11 16:32:46 -0400146 return nfs_release(inode, filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
Trond Myklebust980802e2005-06-13 11:14:01 -0400149/**
150 * nfs_revalidate_size - Revalidate the file size
151 * @inode - pointer to inode struct
152 * @file - pointer to struct file
153 *
154 * Revalidates the file length. This is basically a wrapper around
155 * nfs_revalidate_inode() that takes into account the fact that we may
156 * have cached writes (in which case we don't care about the server's
157 * idea of what the file length is), or O_DIRECT (in which case we
158 * shouldn't trust the cache).
159 */
160static int nfs_revalidate_file_size(struct inode *inode, struct file *filp)
161{
162 struct nfs_server *server = NFS_SERVER(inode);
163 struct nfs_inode *nfsi = NFS_I(inode);
164
Trond Myklebustd7cf8dd2010-04-16 16:42:46 -0400165 if (nfs_have_delegated_attributes(inode))
166 goto out_noreval;
167
Trond Myklebust980802e2005-06-13 11:14:01 -0400168 if (filp->f_flags & O_DIRECT)
169 goto force_reval;
Trond Myklebustd7cf8dd2010-04-16 16:42:46 -0400170 if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
171 goto force_reval;
172 if (nfs_attribute_timeout(inode))
173 goto force_reval;
174out_noreval:
175 return 0;
Trond Myklebust980802e2005-06-13 11:14:01 -0400176force_reval:
177 return __nfs_revalidate_inode(server, inode);
178}
179
180static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin)
181{
Andi Kleen9465efc2008-06-27 11:05:24 +0200182 loff_t loff;
Trond Myklebuste89e8962008-07-15 18:34:16 -0400183
Chuck Lever6da24bc2008-06-11 17:55:58 -0400184 dprintk("NFS: llseek file(%s/%s, %lld, %d)\n",
Chuck Leverb84e06c2008-06-11 17:55:34 -0400185 filp->f_path.dentry->d_parent->d_name.name,
186 filp->f_path.dentry->d_name.name,
187 offset, origin);
188
Trond Myklebust980802e2005-06-13 11:14:01 -0400189 /* origin == SEEK_END => we must revalidate the cached file length */
Josef 'Jeff' Sipekaec5e172006-09-16 21:09:32 -0400190 if (origin == SEEK_END) {
Trond Myklebust980802e2005-06-13 11:14:01 -0400191 struct inode *inode = filp->f_mapping->host;
Trond Myklebustd5e66342008-09-23 17:28:35 -0400192
Trond Myklebust980802e2005-06-13 11:14:01 -0400193 int retval = nfs_revalidate_file_size(inode, filp);
194 if (retval < 0)
195 return (loff_t)retval;
Trond Myklebustd5e66342008-09-23 17:28:35 -0400196
197 spin_lock(&inode->i_lock);
198 loff = generic_file_llseek_unlocked(filp, offset, origin);
199 spin_unlock(&inode->i_lock);
200 } else
201 loff = generic_file_llseek_unlocked(filp, offset, origin);
Andi Kleen9465efc2008-06-27 11:05:24 +0200202 return loff;
Trond Myklebust980802e2005-06-13 11:14:01 -0400203}
204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205/*
206 * Flush all dirty pages, and check for write errors.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 */
208static int
Miklos Szeredi75e1fcc2006-06-23 02:05:12 -0700209nfs_file_flush(struct file *file, fl_owner_t id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210{
Chuck Lever6da24bc2008-06-11 17:55:58 -0400211 struct dentry *dentry = file->f_path.dentry;
212 struct inode *inode = dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
Chuck Lever6da24bc2008-06-11 17:55:58 -0400214 dprintk("NFS: flush(%s/%s)\n",
215 dentry->d_parent->d_name.name,
216 dentry->d_name.name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Chuck Leverc2459dc2010-02-01 14:17:14 -0500218 nfs_inc_stats(inode, NFSIOS_VFSFLUSH);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 if ((file->f_mode & FMODE_WRITE) == 0)
220 return 0;
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400221
Trond Myklebust7fe5c392009-03-19 15:35:50 -0400222 /* Flush writes to the server and return any errors */
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400223 return vfs_fsync(file, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
226static ssize_t
Badari Pulavarty027445c2006-09-30 23:28:46 -0700227nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
228 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800230 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 struct inode * inode = dentry->d_inode;
232 ssize_t result;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700233 size_t count = iov_length(iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (iocb->ki_filp->f_flags & O_DIRECT)
Badari Pulavarty027445c2006-09-30 23:28:46 -0700236 return nfs_file_direct_read(iocb, iov, nr_segs, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
Chuck Lever6da24bc2008-06-11 17:55:58 -0400238 dprintk("NFS: read(%s/%s, %lu@%lu)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 dentry->d_parent->d_name.name, dentry->d_name.name,
240 (unsigned long) count, (unsigned long) pos);
241
Trond Myklebust44b11872006-05-25 01:40:59 -0400242 result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
Chuck Lever4184dcf2010-02-01 14:17:23 -0500243 if (!result) {
Badari Pulavarty027445c2006-09-30 23:28:46 -0700244 result = generic_file_aio_read(iocb, iov, nr_segs, pos);
Chuck Lever4184dcf2010-02-01 14:17:23 -0500245 if (result > 0)
246 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result);
247 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 return result;
249}
250
251static ssize_t
Jens Axboef0930ff2007-06-01 11:51:43 +0200252nfs_file_splice_read(struct file *filp, loff_t *ppos,
253 struct pipe_inode_info *pipe, size_t count,
254 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800256 struct dentry *dentry = filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 struct inode *inode = dentry->d_inode;
258 ssize_t res;
259
Chuck Lever6da24bc2008-06-11 17:55:58 -0400260 dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 dentry->d_parent->d_name.name, dentry->d_name.name,
262 (unsigned long) count, (unsigned long long) *ppos);
263
Trond Myklebust44b11872006-05-25 01:40:59 -0400264 res = nfs_revalidate_mapping(inode, filp->f_mapping);
Chuck Leveraa2f1ef2010-02-01 14:17:32 -0500265 if (!res) {
Jens Axboef0930ff2007-06-01 11:51:43 +0200266 res = generic_file_splice_read(filp, ppos, pipe, count, flags);
Chuck Leveraa2f1ef2010-02-01 14:17:32 -0500267 if (res > 0)
268 nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res);
269 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 return res;
271}
272
273static int
274nfs_file_mmap(struct file * file, struct vm_area_struct * vma)
275{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800276 struct dentry *dentry = file->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 struct inode *inode = dentry->d_inode;
278 int status;
279
Chuck Lever6da24bc2008-06-11 17:55:58 -0400280 dprintk("NFS: mmap(%s/%s)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 dentry->d_parent->d_name.name, dentry->d_name.name);
282
Trond Myklebuste1ebfd32009-03-11 14:37:54 -0400283 /* Note: generic_file_mmap() returns ENOSYS on nommu systems
284 * so we call that before revalidating the mapping
285 */
286 status = generic_file_mmap(file, vma);
Trond Myklebust94387fb2007-07-22 17:09:05 -0400287 if (!status) {
288 vma->vm_ops = &nfs_file_vm_ops;
Trond Myklebuste1ebfd32009-03-11 14:37:54 -0400289 status = nfs_revalidate_mapping(inode, file->f_mapping);
Trond Myklebust94387fb2007-07-22 17:09:05 -0400290 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 return status;
292}
293
294/*
295 * Flush any dirty pages for this process, and check for write errors.
296 * The return status from this call provides a reliable indication of
297 * whether any write errors occurred for this process.
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400298 *
299 * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to
300 * disk, but it retrieves and clears ctx->error after synching, despite
301 * the two being set at the same time in nfs_context_set_write_error().
302 * This is because the former is used to notify the _next_ call to
303 * nfs_file_write() that a write error occured, and hence cause it to
304 * fall back to doing a synchronous write.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 */
306static int
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200307nfs_file_fsync(struct file *file, int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200309 struct dentry *dentry = file->f_path.dentry;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400310 struct nfs_open_context *ctx = nfs_file_open_context(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 struct inode *inode = dentry->d_inode;
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400312 int have_error, status;
313 int ret = 0;
314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Chuck Lever6da24bc2008-06-11 17:55:58 -0400316 dprintk("NFS: fsync file(%s/%s) datasync %d\n",
Chuck Lever54917782008-05-27 16:29:07 -0400317 dentry->d_parent->d_name.name, dentry->d_name.name,
318 datasync);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Chuck Lever91d5b472006-03-20 13:44:14 -0500320 nfs_inc_stats(inode, NFSIOS_VFSFSYNC);
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400321 have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
322 status = nfs_commit_inode(inode, FLUSH_SYNC);
323 have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
324 if (have_error)
325 ret = xchg(&ctx->error, 0);
J. R. Okajima07020992010-08-11 13:10:16 -0400326 if (!ret && status < 0)
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400327 ret = status;
328 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329}
330
331/*
Peter Staubach38c73042009-08-10 08:54:16 -0400332 * Decide whether a read/modify/write cycle may be more efficient
333 * then a modify/write/read cycle when writing to a page in the
334 * page cache.
335 *
336 * The modify/write/read cycle may occur if a page is read before
337 * being completely filled by the writer. In this situation, the
338 * page must be completely written to stable storage on the server
339 * before it can be refilled by reading in the page from the server.
340 * This can lead to expensive, small, FILE_SYNC mode writes being
341 * done.
342 *
343 * It may be more efficient to read the page first if the file is
344 * open for reading in addition to writing, the page is not marked
345 * as Uptodate, it is not dirty or waiting to be committed,
346 * indicating that it was previously allocated and then modified,
347 * that there were valid bytes of data in that range of the file,
348 * and that the new data won't completely replace the old data in
349 * that range of the file.
350 */
351static int nfs_want_read_modify_write(struct file *file, struct page *page,
352 loff_t pos, unsigned len)
353{
354 unsigned int pglen = nfs_page_length(page);
355 unsigned int offset = pos & (PAGE_CACHE_SIZE - 1);
356 unsigned int end = offset + len;
357
358 if ((file->f_mode & FMODE_READ) && /* open for read? */
359 !PageUptodate(page) && /* Uptodate? */
360 !PagePrivate(page) && /* i/o request already? */
361 pglen && /* valid bytes of file? */
362 (end < pglen || offset)) /* replace all valid bytes? */
363 return 1;
364 return 0;
365}
366
367/*
Nick Piggin4899f9c2007-10-16 01:25:16 -0700368 * This does the "real" work of the write. We must allocate and lock the
369 * page to be sent back to the generic routine, which then copies the
370 * data from user space.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 *
372 * If the writer ends up delaying the write, the writer needs to
373 * increment the page use counts until he is done with the page.
374 */
Nick Piggin4899f9c2007-10-16 01:25:16 -0700375static int nfs_write_begin(struct file *file, struct address_space *mapping,
376 loff_t pos, unsigned len, unsigned flags,
377 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378{
Nick Piggin4899f9c2007-10-16 01:25:16 -0700379 int ret;
Peter Staubach38c73042009-08-10 08:54:16 -0400380 pgoff_t index = pos >> PAGE_CACHE_SHIFT;
Nick Piggin4899f9c2007-10-16 01:25:16 -0700381 struct page *page;
Peter Staubach38c73042009-08-10 08:54:16 -0400382 int once_thru = 0;
Nick Piggin4899f9c2007-10-16 01:25:16 -0700383
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400384 dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n",
385 file->f_path.dentry->d_parent->d_name.name,
386 file->f_path.dentry->d_name.name,
387 mapping->host->i_ino, len, (long long) pos);
388
Peter Staubach38c73042009-08-10 08:54:16 -0400389start:
Trond Myklebust72cb77f2009-03-11 14:10:30 -0400390 /*
391 * Prevent starvation issues if someone is doing a consistency
392 * sync-to-disk
393 */
394 ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING,
395 nfs_wait_bit_killable, TASK_KILLABLE);
396 if (ret)
397 return ret;
398
Nick Piggin54566b22009-01-04 12:00:53 -0800399 page = grab_cache_page_write_begin(mapping, index, flags);
Nick Piggin4899f9c2007-10-16 01:25:16 -0700400 if (!page)
401 return -ENOMEM;
402 *pagep = page;
403
404 ret = nfs_flush_incompatible(file, page);
405 if (ret) {
406 unlock_page(page);
407 page_cache_release(page);
Peter Staubach38c73042009-08-10 08:54:16 -0400408 } else if (!once_thru &&
409 nfs_want_read_modify_write(file, page, pos, len)) {
410 once_thru = 1;
411 ret = nfs_readpage(file, page);
412 page_cache_release(page);
413 if (!ret)
414 goto start;
Nick Piggin4899f9c2007-10-16 01:25:16 -0700415 }
416 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417}
418
Nick Piggin4899f9c2007-10-16 01:25:16 -0700419static int nfs_write_end(struct file *file, struct address_space *mapping,
420 loff_t pos, unsigned len, unsigned copied,
421 struct page *page, void *fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422{
Nick Piggin4899f9c2007-10-16 01:25:16 -0700423 unsigned offset = pos & (PAGE_CACHE_SIZE - 1);
424 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400426 dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n",
427 file->f_path.dentry->d_parent->d_name.name,
428 file->f_path.dentry->d_name.name,
429 mapping->host->i_ino, len, (long long) pos);
430
Trond Myklebustefc91ed2008-06-10 18:31:00 -0400431 /*
432 * Zero any uninitialised parts of the page, and then mark the page
433 * as up to date if it turns out that we're extending the file.
434 */
435 if (!PageUptodate(page)) {
436 unsigned pglen = nfs_page_length(page);
437 unsigned end = offset + len;
438
439 if (pglen == 0) {
440 zero_user_segments(page, 0, offset,
441 end, PAGE_CACHE_SIZE);
442 SetPageUptodate(page);
443 } else if (end >= pglen) {
444 zero_user_segment(page, end, PAGE_CACHE_SIZE);
445 if (offset == 0)
446 SetPageUptodate(page);
447 } else
448 zero_user_segment(page, pglen, PAGE_CACHE_SIZE);
449 }
450
Nick Piggin4899f9c2007-10-16 01:25:16 -0700451 status = nfs_updatepage(file, page, offset, copied);
Nick Piggin4899f9c2007-10-16 01:25:16 -0700452
453 unlock_page(page);
454 page_cache_release(page);
455
Chuck Lever3d509e52007-12-20 14:55:04 -0500456 if (status < 0)
457 return status;
458 return copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459}
460
David Howells6b9b3512009-04-03 16:42:41 +0100461/*
462 * Partially or wholly invalidate a page
463 * - Release the private state associated with a page if undergoing complete
464 * page invalidation
David Howells545db452009-04-03 16:42:44 +0100465 * - Called if either PG_private or PG_fscache is set on the page
David Howells6b9b3512009-04-03 16:42:41 +0100466 * - Caller holds page lock
467 */
NeilBrown2ff28e22006-03-26 01:37:18 -0800468static void nfs_invalidate_page(struct page *page, unsigned long offset)
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500469{
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400470 dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
471
Trond Myklebust1c759502006-10-09 16:18:38 -0400472 if (offset != 0)
473 return;
Trond Myklebustd2ccddf2006-05-31 01:13:38 -0400474 /* Cancel any unstarted writes on this page */
Trond Myklebust1b3b4a12007-08-28 10:29:36 -0400475 nfs_wb_page_cancel(page->mapping->host, page);
David Howells545db452009-04-03 16:42:44 +0100476
477 nfs_fscache_invalidate_page(page, page->mapping->host);
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500478}
479
David Howells6b9b3512009-04-03 16:42:41 +0100480/*
481 * Attempt to release the private state associated with a page
David Howells545db452009-04-03 16:42:44 +0100482 * - Called if either PG_private or PG_fscache is set on the page
David Howells6b9b3512009-04-03 16:42:41 +0100483 * - Caller holds page lock
484 * - Return true (may release page) or false (may not)
485 */
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500486static int nfs_release_page(struct page *page, gfp_t gfp)
487{
Trond Myklebustb608b282010-07-30 15:31:54 -0400488 struct address_space *mapping = page->mapping;
489
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400490 dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page);
491
Trond Myklebustd812e572010-03-19 13:55:17 -0400492 /* Only do I/O if gfp is a superset of GFP_KERNEL */
Trond Myklebustb608b282010-07-30 15:31:54 -0400493 if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL) {
494 int how = FLUSH_SYNC;
495
496 /* Don't let kswapd deadlock waiting for OOM RPC calls */
497 if (current_is_kswapd())
498 how = 0;
499 nfs_commit_inode(mapping->host, how);
500 }
Trond Myklebuste3db7692007-01-10 23:15:39 -0800501 /* If PagePrivate() is set, then the page is not freeable */
David Howells545db452009-04-03 16:42:44 +0100502 if (PagePrivate(page))
503 return 0;
504 return nfs_fscache_release_page(page, gfp);
Trond Myklebuste3db7692007-01-10 23:15:39 -0800505}
506
David Howells6b9b3512009-04-03 16:42:41 +0100507/*
508 * Attempt to clear the private state associated with a page when an error
509 * occurs that requires the cached contents of an inode to be written back or
510 * destroyed
David Howells545db452009-04-03 16:42:44 +0100511 * - Called if either PG_private or fscache is set on the page
David Howells6b9b3512009-04-03 16:42:41 +0100512 * - Caller holds page lock
513 * - Return 0 if successful, -error otherwise
514 */
Trond Myklebuste3db7692007-01-10 23:15:39 -0800515static int nfs_launder_page(struct page *page)
516{
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400517 struct inode *inode = page->mapping->host;
David Howells545db452009-04-03 16:42:44 +0100518 struct nfs_inode *nfsi = NFS_I(inode);
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400519
520 dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n",
521 inode->i_ino, (long long)page_offset(page));
522
David Howells545db452009-04-03 16:42:44 +0100523 nfs_fscache_wait_on_page_write(nfsi, page);
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400524 return nfs_wb_page(inode, page);
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500525}
526
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700527const struct address_space_operations nfs_file_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 .readpage = nfs_readpage,
529 .readpages = nfs_readpages,
Trond Myklebust9cccef92007-07-22 17:09:05 -0400530 .set_page_dirty = __set_page_dirty_nobuffers,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 .writepage = nfs_writepage,
532 .writepages = nfs_writepages,
Nick Piggin4899f9c2007-10-16 01:25:16 -0700533 .write_begin = nfs_write_begin,
534 .write_end = nfs_write_end,
Trond Myklebustcd52ed32006-03-20 13:44:04 -0500535 .invalidatepage = nfs_invalidate_page,
536 .releasepage = nfs_release_page,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 .direct_IO = nfs_direct_IO,
Trond Myklebust074cc1d2009-08-10 08:54:13 -0400538 .migratepage = nfs_migrate_page,
Trond Myklebuste3db7692007-01-10 23:15:39 -0800539 .launder_page = nfs_launder_page,
Andi Kleenf590f332009-09-16 11:50:17 +0200540 .error_remove_page = generic_error_remove_page,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541};
542
David Howells6b9b3512009-04-03 16:42:41 +0100543/*
544 * Notification that a PTE pointing to an NFS page is about to be made
545 * writable, implying that someone is about to modify the page through a
546 * shared-writable mapping
547 */
Nick Pigginc2ec1752009-03-31 15:23:21 -0700548static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Trond Myklebust94387fb2007-07-22 17:09:05 -0400549{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700550 struct page *page = vmf->page;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400551 struct file *filp = vma->vm_file;
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400552 struct dentry *dentry = filp->f_path.dentry;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400553 unsigned pagelen;
554 int ret = -EINVAL;
Nick Piggin4899f9c2007-10-16 01:25:16 -0700555 struct address_space *mapping;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400556
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400557 dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n",
558 dentry->d_parent->d_name.name, dentry->d_name.name,
559 filp->f_mapping->host->i_ino,
560 (long long)page_offset(page));
561
David Howells545db452009-04-03 16:42:44 +0100562 /* make sure the cache has finished storing the page */
563 nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page);
564
Trond Myklebust94387fb2007-07-22 17:09:05 -0400565 lock_page(page);
Nick Piggin4899f9c2007-10-16 01:25:16 -0700566 mapping = page->mapping;
Chuck Leverb7eaefa2008-06-11 17:55:50 -0400567 if (mapping != dentry->d_inode->i_mapping)
Trond Myklebust8b1f9ee2008-01-22 17:13:06 -0500568 goto out_unlock;
569
570 ret = 0;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400571 pagelen = nfs_page_length(page);
Trond Myklebust8b1f9ee2008-01-22 17:13:06 -0500572 if (pagelen == 0)
573 goto out_unlock;
574
575 ret = nfs_flush_incompatible(filp, page);
576 if (ret != 0)
577 goto out_unlock;
578
579 ret = nfs_updatepage(filp, page, 0, pagelen);
Trond Myklebust8b1f9ee2008-01-22 17:13:06 -0500580out_unlock:
Trond Myklebust7fdf5232009-04-24 17:32:22 -0400581 if (!ret)
582 return VM_FAULT_LOCKED;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400583 unlock_page(page);
Trond Myklebust7fdf5232009-04-24 17:32:22 -0400584 return VM_FAULT_SIGBUS;
Trond Myklebust94387fb2007-07-22 17:09:05 -0400585}
586
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400587static const struct vm_operations_struct nfs_file_vm_ops = {
Trond Myklebust94387fb2007-07-22 17:09:05 -0400588 .fault = filemap_fault,
589 .page_mkwrite = nfs_vm_page_mkwrite,
590};
591
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400592static int nfs_need_sync_write(struct file *filp, struct inode *inode)
593{
594 struct nfs_open_context *ctx;
595
Christoph Hellwig6b2f3d12009-10-27 11:05:28 +0100596 if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC))
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400597 return 1;
Trond Myklebustcd3758e2007-08-10 17:44:32 -0400598 ctx = nfs_file_open_context(filp);
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400599 if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags))
600 return 1;
601 return 0;
602}
603
Badari Pulavarty027445c2006-09-30 23:28:46 -0700604static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
605 unsigned long nr_segs, loff_t pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606{
Josef "Jeff" Sipek01cce932006-12-08 02:36:40 -0800607 struct dentry * dentry = iocb->ki_filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 struct inode * inode = dentry->d_inode;
Chuck Lever7e381172010-02-01 14:17:41 -0500609 unsigned long written = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 ssize_t result;
Badari Pulavarty027445c2006-09-30 23:28:46 -0700611 size_t count = iov_length(iov, nr_segs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 if (iocb->ki_filp->f_flags & O_DIRECT)
Badari Pulavarty027445c2006-09-30 23:28:46 -0700614 return nfs_file_direct_write(iocb, iov, nr_segs, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
Chuck Lever6da24bc2008-06-11 17:55:58 -0400616 dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 dentry->d_parent->d_name.name, dentry->d_name.name,
Chuck Lever6da24bc2008-06-11 17:55:58 -0400618 (unsigned long) count, (long long) pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
620 result = -EBUSY;
621 if (IS_SWAPFILE(inode))
622 goto out_swapfile;
Trond Myklebust7d52e862005-06-22 17:16:30 +0000623 /*
624 * O_APPEND implies that we must revalidate the file length.
625 */
626 if (iocb->ki_filp->f_flags & O_APPEND) {
627 result = nfs_revalidate_file_size(inode, iocb->ki_filp);
628 if (result)
629 goto out;
Trond Myklebustfe51beec2005-06-22 17:16:30 +0000630 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
632 result = count;
633 if (!count)
634 goto out;
635
Badari Pulavarty027445c2006-09-30 23:28:46 -0700636 result = generic_file_aio_write(iocb, iov, nr_segs, pos);
Chuck Lever7e381172010-02-01 14:17:41 -0500637 if (result > 0)
638 written = result;
639
Christoph Hellwig6b2f3d12009-10-27 11:05:28 +0100640 /* Return error values for O_DSYNC and IS_SYNC() */
Trond Myklebust7b159fc2007-07-25 14:09:54 -0400641 if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) {
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400642 int err = vfs_fsync(iocb->ki_filp, 0);
Trond Myklebust200baa22006-12-05 00:35:40 -0500643 if (err < 0)
644 result = err;
645 }
Chuck Lever7e381172010-02-01 14:17:41 -0500646 if (result > 0)
647 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648out:
649 return result;
650
651out_swapfile:
652 printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
653 goto out;
654}
655
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700656static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe,
657 struct file *filp, loff_t *ppos,
658 size_t count, unsigned int flags)
659{
660 struct dentry *dentry = filp->f_path.dentry;
661 struct inode *inode = dentry->d_inode;
Chuck Lever7e381172010-02-01 14:17:41 -0500662 unsigned long written = 0;
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700663 ssize_t ret;
664
665 dprintk("NFS splice_write(%s/%s, %lu@%llu)\n",
666 dentry->d_parent->d_name.name, dentry->d_name.name,
667 (unsigned long) count, (unsigned long long) *ppos);
668
669 /*
670 * The combination of splice and an O_APPEND destination is disallowed.
671 */
672
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700673 ret = generic_file_splice_write(pipe, filp, ppos, count, flags);
Chuck Lever7e381172010-02-01 14:17:41 -0500674 if (ret > 0)
675 written = ret;
676
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700677 if (ret >= 0 && nfs_need_sync_write(filp, inode)) {
Trond Myklebustaf7fa162010-07-31 14:29:06 -0400678 int err = vfs_fsync(filp, 0);
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700679 if (err < 0)
680 ret = err;
681 }
Chuck Lever7e381172010-02-01 14:17:41 -0500682 if (ret > 0)
683 nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written);
Suresh Jayaramanbf40d342009-06-17 18:02:09 -0700684 return ret;
685}
686
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687static int do_getlk(struct file *filp, int cmd, struct file_lock *fl)
688{
689 struct inode *inode = filp->f_mapping->host;
690 int status = 0;
691
Trond Myklebust039c4d72005-10-18 14:20:16 -0700692 /* Try local locking first */
J. Bruce Fields6d34ac12007-05-11 16:09:32 -0400693 posix_test_lock(filp, fl);
694 if (fl->fl_type != F_UNLCK) {
695 /* found a conflict */
Trond Myklebust039c4d72005-10-18 14:20:16 -0700696 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 }
Trond Myklebust039c4d72005-10-18 14:20:16 -0700698
699 if (nfs_have_delegation(inode, FMODE_READ))
700 goto out_noconflict;
701
702 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)
703 goto out_noconflict;
704
705 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
706out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 return status;
Trond Myklebust039c4d72005-10-18 14:20:16 -0700708out_noconflict:
709 fl->fl_type = F_UNLCK;
710 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711}
712
713static int do_vfs_lock(struct file *file, struct file_lock *fl)
714{
715 int res = 0;
716 switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) {
717 case FL_POSIX:
718 res = posix_lock_file_wait(file, fl);
719 break;
720 case FL_FLOCK:
721 res = flock_lock_file_wait(file, fl);
722 break;
723 default:
724 BUG();
725 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 return res;
727}
728
729static int do_unlk(struct file *filp, int cmd, struct file_lock *fl)
730{
731 struct inode *inode = filp->f_mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 int status;
733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 /*
735 * Flush all pending writes before doing anything
736 * with locks..
737 */
Trond Myklebust29884df2005-12-13 16:13:54 -0500738 nfs_sync_mapping(filp->f_mapping);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
740 /* NOTE: special case
741 * If we're signalled while cleaning up locks on process exit, we
742 * still need to complete the unlock.
743 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 /* Use local locking if mounted with "-onolock" */
745 if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
746 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
747 else
748 status = do_vfs_lock(filp, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 return status;
750}
751
752static int do_setlk(struct file *filp, int cmd, struct file_lock *fl)
753{
754 struct inode *inode = filp->f_mapping->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755 int status;
756
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757 /*
758 * Flush all pending writes before doing anything
759 * with locks..
760 */
Trond Myklebust29884df2005-12-13 16:13:54 -0500761 status = nfs_sync_mapping(filp->f_mapping);
762 if (status != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763 goto out;
764
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 /* Use local locking if mounted with "-onolock" */
Trond Myklebustc4d7c402008-04-01 20:26:52 -0400766 if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 status = NFS_PROTO(inode)->lock(filp, cmd, fl);
Trond Myklebustc4d7c402008-04-01 20:26:52 -0400768 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 status = do_vfs_lock(filp, fl);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 if (status < 0)
771 goto out;
772 /*
773 * Make sure we clear the cache whenever we try to get the lock.
774 * This makes locking act as a cache coherency point.
775 */
Trond Myklebust29884df2005-12-13 16:13:54 -0500776 nfs_sync_mapping(filp->f_mapping);
Trond Myklebustb5418382008-06-10 18:31:02 -0400777 if (!nfs_have_delegation(inode, FMODE_READ))
778 nfs_zap_caches(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 return status;
781}
782
783/*
784 * Lock a (portion of) a file
785 */
786static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl)
787{
Chuck Lever6da24bc2008-06-11 17:55:58 -0400788 struct inode *inode = filp->f_mapping->host;
Trond Myklebust21162712008-05-20 19:34:39 -0400789 int ret = -ENOLCK;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790
Chuck Lever6da24bc2008-06-11 17:55:58 -0400791 dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n",
792 filp->f_path.dentry->d_parent->d_name.name,
793 filp->f_path.dentry->d_name.name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 fl->fl_type, fl->fl_flags,
795 (long long)fl->fl_start, (long long)fl->fl_end);
Chuck Lever6da24bc2008-06-11 17:55:58 -0400796
Chuck Lever91d5b472006-03-20 13:44:14 -0500797 nfs_inc_stats(inode, NFSIOS_VFSLOCK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798
799 /* No mandatory locks over NFS */
Pavel Emelyanovdfad9442007-10-01 14:41:15 -0700800 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK)
Trond Myklebust21162712008-05-20 19:34:39 -0400801 goto out_err;
802
803 if (NFS_PROTO(inode)->lock_check_bounds != NULL) {
804 ret = NFS_PROTO(inode)->lock_check_bounds(fl);
805 if (ret < 0)
806 goto out_err;
807 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
809 if (IS_GETLK(cmd))
Trond Myklebust21162712008-05-20 19:34:39 -0400810 ret = do_getlk(filp, cmd, fl);
811 else if (fl->fl_type == F_UNLCK)
812 ret = do_unlk(filp, cmd, fl);
813 else
814 ret = do_setlk(filp, cmd, fl);
815out_err:
816 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817}
818
819/*
820 * Lock a (portion of) a file
821 */
822static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl)
823{
Chuck Lever6da24bc2008-06-11 17:55:58 -0400824 dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n",
825 filp->f_path.dentry->d_parent->d_name.name,
826 filp->f_path.dentry->d_name.name,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 fl->fl_type, fl->fl_flags);
828
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 if (!(fl->fl_flags & FL_FLOCK))
830 return -ENOLCK;
831
832 /* We're simulating flock() locks using posix locks on the server */
833 fl->fl_owner = (fl_owner_t)filp;
834 fl->fl_start = 0;
835 fl->fl_end = OFFSET_MAX;
836
837 if (fl->fl_type == F_UNLCK)
838 return do_unlk(filp, cmd, fl);
839 return do_setlk(filp, cmd, fl);
840}
J. Bruce Fields370f6592007-06-08 15:23:34 -0400841
Chuck Lever6da24bc2008-06-11 17:55:58 -0400842/*
843 * There is no protocol support for leases, so we have no way to implement
844 * them correctly in the face of opens by other clients.
845 */
J. Bruce Fields370f6592007-06-08 15:23:34 -0400846static int nfs_setlease(struct file *file, long arg, struct file_lock **fl)
847{
Chuck Lever6da24bc2008-06-11 17:55:58 -0400848 dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
849 file->f_path.dentry->d_parent->d_name.name,
850 file->f_path.dentry->d_name.name, arg);
851
J. Bruce Fields370f6592007-06-08 15:23:34 -0400852 return -EINVAL;
853}