Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/file.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * Changes Copyright (C) 1994 by Florian La Roche | |
7 | * - Do not copy data too often around in the kernel. | |
8 | * - In nfs_file_read the return value of kmalloc wasn't checked. | |
9 | * - Put in a better version of read look-ahead buffering. Original idea | |
10 | * and implementation by Wai S Kok elekokws@ee.nus.sg. | |
11 | * | |
12 | * Expire cache on write to a file by Wai S Kok (Oct 1994). | |
13 | * | |
14 | * Total rewrite of read side for new NFS buffer cache.. Linus. | |
15 | * | |
16 | * nfs regular file handling functions | |
17 | */ | |
18 | ||
ddda8e0a | 19 | #include <linux/module.h> |
1da177e4 LT |
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> | |
1da177e4 | 28 | #include <linux/pagemap.h> |
e8edc6e0 | 29 | #include <linux/aio.h> |
5a0e3ad6 | 30 | #include <linux/gfp.h> |
b608b283 | 31 | #include <linux/swap.h> |
1da177e4 LT |
32 | |
33 | #include <asm/uaccess.h> | |
1da177e4 LT |
34 | |
35 | #include "delegation.h" | |
94387fb1 | 36 | #include "internal.h" |
91d5b470 | 37 | #include "iostat.h" |
545db45f | 38 | #include "fscache.h" |
1da177e4 | 39 | |
f4ce1299 TM |
40 | #include "nfstrace.h" |
41 | ||
1da177e4 LT |
42 | #define NFSDBG_FACILITY NFSDBG_FILE |
43 | ||
f0f37e2f | 44 | static const struct vm_operations_struct nfs_file_vm_ops; |
94387fb1 | 45 | |
1da177e4 LT |
46 | /* Hack for future NFS swap support */ |
47 | #ifndef IS_SWAPFILE | |
48 | # define IS_SWAPFILE(inode) (0) | |
49 | #endif | |
50 | ||
ce4ef7c0 | 51 | int nfs_check_flags(int flags) |
1da177e4 LT |
52 | { |
53 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
54 | return -EINVAL; | |
55 | ||
56 | return 0; | |
57 | } | |
89d77c8f | 58 | EXPORT_SYMBOL_GPL(nfs_check_flags); |
1da177e4 LT |
59 | |
60 | /* | |
61 | * Open file | |
62 | */ | |
63 | static int | |
64 | nfs_file_open(struct inode *inode, struct file *filp) | |
65 | { | |
1da177e4 LT |
66 | int res; |
67 | ||
6da24bc9 | 68 | dprintk("NFS: open file(%s/%s)\n", |
cc0dd2d1 CL |
69 | filp->f_path.dentry->d_parent->d_name.name, |
70 | filp->f_path.dentry->d_name.name); | |
71 | ||
c2459dc4 | 72 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
1da177e4 LT |
73 | res = nfs_check_flags(filp->f_flags); |
74 | if (res) | |
75 | return res; | |
76 | ||
46cb650c | 77 | res = nfs_open(inode, filp); |
1da177e4 LT |
78 | return res; |
79 | } | |
80 | ||
ce4ef7c0 | 81 | int |
1da177e4 LT |
82 | nfs_file_release(struct inode *inode, struct file *filp) |
83 | { | |
6da24bc9 | 84 | dprintk("NFS: release(%s/%s)\n", |
6f276e49 RM |
85 | filp->f_path.dentry->d_parent->d_name.name, |
86 | filp->f_path.dentry->d_name.name); | |
6da24bc9 | 87 | |
91d5b470 | 88 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
46cb650c | 89 | return nfs_release(inode, filp); |
1da177e4 | 90 | } |
89d77c8f | 91 | EXPORT_SYMBOL_GPL(nfs_file_release); |
1da177e4 | 92 | |
980802e3 TM |
93 | /** |
94 | * nfs_revalidate_size - Revalidate the file size | |
95 | * @inode - pointer to inode struct | |
96 | * @file - pointer to struct file | |
97 | * | |
98 | * Revalidates the file length. This is basically a wrapper around | |
99 | * nfs_revalidate_inode() that takes into account the fact that we may | |
100 | * have cached writes (in which case we don't care about the server's | |
101 | * idea of what the file length is), or O_DIRECT (in which case we | |
102 | * shouldn't trust the cache). | |
103 | */ | |
104 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
105 | { | |
106 | struct nfs_server *server = NFS_SERVER(inode); | |
107 | struct nfs_inode *nfsi = NFS_I(inode); | |
108 | ||
d7cf8dd0 TM |
109 | if (nfs_have_delegated_attributes(inode)) |
110 | goto out_noreval; | |
111 | ||
980802e3 TM |
112 | if (filp->f_flags & O_DIRECT) |
113 | goto force_reval; | |
d7cf8dd0 TM |
114 | if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) |
115 | goto force_reval; | |
116 | if (nfs_attribute_timeout(inode)) | |
117 | goto force_reval; | |
118 | out_noreval: | |
119 | return 0; | |
980802e3 TM |
120 | force_reval: |
121 | return __nfs_revalidate_inode(server, inode); | |
122 | } | |
123 | ||
965c8e59 | 124 | loff_t nfs_file_llseek(struct file *filp, loff_t offset, int whence) |
980802e3 | 125 | { |
6da24bc9 | 126 | dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
127 | filp->f_path.dentry->d_parent->d_name.name, |
128 | filp->f_path.dentry->d_name.name, | |
965c8e59 | 129 | offset, whence); |
b84e06c5 | 130 | |
06222e49 | 131 | /* |
965c8e59 | 132 | * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate |
06222e49 JB |
133 | * the cached file length |
134 | */ | |
965c8e59 | 135 | if (whence != SEEK_SET && whence != SEEK_CUR) { |
980802e3 | 136 | struct inode *inode = filp->f_mapping->host; |
d5e66348 | 137 | |
980802e3 TM |
138 | int retval = nfs_revalidate_file_size(inode, filp); |
139 | if (retval < 0) | |
140 | return (loff_t)retval; | |
79835a71 | 141 | } |
d5e66348 | 142 | |
965c8e59 | 143 | return generic_file_llseek(filp, offset, whence); |
980802e3 | 144 | } |
89d77c8f | 145 | EXPORT_SYMBOL_GPL(nfs_file_llseek); |
980802e3 | 146 | |
1da177e4 LT |
147 | /* |
148 | * Flush all dirty pages, and check for write errors. | |
1da177e4 | 149 | */ |
ce4ef7c0 | 150 | int |
75e1fcc0 | 151 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 | 152 | { |
6da24bc9 CL |
153 | struct dentry *dentry = file->f_path.dentry; |
154 | struct inode *inode = dentry->d_inode; | |
1da177e4 | 155 | |
6da24bc9 CL |
156 | dprintk("NFS: flush(%s/%s)\n", |
157 | dentry->d_parent->d_name.name, | |
158 | dentry->d_name.name); | |
1da177e4 | 159 | |
c2459dc4 | 160 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
1da177e4 LT |
161 | if ((file->f_mode & FMODE_WRITE) == 0) |
162 | return 0; | |
7b159fc1 | 163 | |
14546c33 TM |
164 | /* |
165 | * If we're holding a write delegation, then just start the i/o | |
166 | * but don't wait for completion (or send a commit). | |
167 | */ | |
011e2a7f | 168 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_WRITE)) |
14546c33 TM |
169 | return filemap_fdatawrite(file->f_mapping); |
170 | ||
7fe5c398 | 171 | /* Flush writes to the server and return any errors */ |
af7fa165 | 172 | return vfs_fsync(file, 0); |
1da177e4 | 173 | } |
89d77c8f | 174 | EXPORT_SYMBOL_GPL(nfs_file_flush); |
1da177e4 | 175 | |
ce4ef7c0 | 176 | ssize_t |
027445c3 BP |
177 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
178 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 179 | { |
01cce933 | 180 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
181 | struct inode * inode = dentry->d_inode; |
182 | ssize_t result; | |
183 | ||
1da177e4 | 184 | if (iocb->ki_filp->f_flags & O_DIRECT) |
a564b8f0 | 185 | return nfs_file_direct_read(iocb, iov, nr_segs, pos, true); |
1da177e4 | 186 | |
6da24bc9 | 187 | dprintk("NFS: read(%s/%s, %lu@%lu)\n", |
1da177e4 | 188 | dentry->d_parent->d_name.name, dentry->d_name.name, |
6f276e49 | 189 | (unsigned long) iov_length(iov, nr_segs), (unsigned long) pos); |
1da177e4 | 190 | |
44b11874 | 191 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
4184dcf2 | 192 | if (!result) { |
027445c3 | 193 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
4184dcf2 CL |
194 | if (result > 0) |
195 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result); | |
196 | } | |
1da177e4 LT |
197 | return result; |
198 | } | |
89d77c8f | 199 | EXPORT_SYMBOL_GPL(nfs_file_read); |
1da177e4 | 200 | |
ce4ef7c0 | 201 | ssize_t |
f0930fff JA |
202 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
203 | struct pipe_inode_info *pipe, size_t count, | |
204 | unsigned int flags) | |
1da177e4 | 205 | { |
01cce933 | 206 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
207 | struct inode *inode = dentry->d_inode; |
208 | ssize_t res; | |
209 | ||
6da24bc9 | 210 | dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", |
1da177e4 LT |
211 | dentry->d_parent->d_name.name, dentry->d_name.name, |
212 | (unsigned long) count, (unsigned long long) *ppos); | |
213 | ||
44b11874 | 214 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
aa2f1ef1 | 215 | if (!res) { |
f0930fff | 216 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
aa2f1ef1 CL |
217 | if (res > 0) |
218 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, res); | |
219 | } | |
1da177e4 LT |
220 | return res; |
221 | } | |
89d77c8f | 222 | EXPORT_SYMBOL_GPL(nfs_file_splice_read); |
1da177e4 | 223 | |
ce4ef7c0 | 224 | int |
1da177e4 LT |
225 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) |
226 | { | |
01cce933 | 227 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
228 | struct inode *inode = dentry->d_inode; |
229 | int status; | |
230 | ||
6da24bc9 | 231 | dprintk("NFS: mmap(%s/%s)\n", |
1da177e4 LT |
232 | dentry->d_parent->d_name.name, dentry->d_name.name); |
233 | ||
e1ebfd33 TM |
234 | /* Note: generic_file_mmap() returns ENOSYS on nommu systems |
235 | * so we call that before revalidating the mapping | |
236 | */ | |
237 | status = generic_file_mmap(file, vma); | |
94387fb1 TM |
238 | if (!status) { |
239 | vma->vm_ops = &nfs_file_vm_ops; | |
e1ebfd33 | 240 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
94387fb1 | 241 | } |
1da177e4 LT |
242 | return status; |
243 | } | |
89d77c8f | 244 | EXPORT_SYMBOL_GPL(nfs_file_mmap); |
1da177e4 LT |
245 | |
246 | /* | |
247 | * Flush any dirty pages for this process, and check for write errors. | |
248 | * The return status from this call provides a reliable indication of | |
249 | * whether any write errors occurred for this process. | |
af7fa165 TM |
250 | * |
251 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to | |
252 | * disk, but it retrieves and clears ctx->error after synching, despite | |
253 | * the two being set at the same time in nfs_context_set_write_error(). | |
254 | * This is because the former is used to notify the _next_ call to | |
25985edc | 255 | * nfs_file_write() that a write error occurred, and hence cause it to |
af7fa165 | 256 | * fall back to doing a synchronous write. |
1da177e4 | 257 | */ |
ce4ef7c0 | 258 | int |
a5c58892 | 259 | nfs_file_fsync_commit(struct file *file, loff_t start, loff_t end, int datasync) |
1da177e4 | 260 | { |
7ea80859 | 261 | struct dentry *dentry = file->f_path.dentry; |
cd3758e3 | 262 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 263 | struct inode *inode = dentry->d_inode; |
05990d1b | 264 | int have_error, do_resend, status; |
af7fa165 TM |
265 | int ret = 0; |
266 | ||
6da24bc9 | 267 | dprintk("NFS: fsync file(%s/%s) datasync %d\n", |
54917786 CL |
268 | dentry->d_parent->d_name.name, dentry->d_name.name, |
269 | datasync); | |
1da177e4 | 270 | |
91d5b470 | 271 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
05990d1b | 272 | do_resend = test_and_clear_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags); |
af7fa165 TM |
273 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); |
274 | status = nfs_commit_inode(inode, FLUSH_SYNC); | |
275 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
05990d1b | 276 | if (have_error) { |
af7fa165 | 277 | ret = xchg(&ctx->error, 0); |
05990d1b TM |
278 | if (ret) |
279 | goto out; | |
280 | } | |
281 | if (status < 0) { | |
af7fa165 | 282 | ret = status; |
05990d1b TM |
283 | goto out; |
284 | } | |
285 | do_resend |= test_bit(NFS_CONTEXT_RESEND_WRITES, &ctx->flags); | |
286 | if (do_resend) | |
287 | ret = -EAGAIN; | |
288 | out: | |
a5c58892 BS |
289 | return ret; |
290 | } | |
89d77c8f | 291 | EXPORT_SYMBOL_GPL(nfs_file_fsync_commit); |
a5c58892 BS |
292 | |
293 | static int | |
294 | nfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) | |
295 | { | |
296 | int ret; | |
496ad9aa | 297 | struct inode *inode = file_inode(file); |
a5c58892 | 298 | |
f4ce1299 TM |
299 | trace_nfs_fsync_enter(inode); |
300 | ||
05990d1b TM |
301 | do { |
302 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); | |
303 | if (ret != 0) | |
304 | break; | |
305 | mutex_lock(&inode->i_mutex); | |
306 | ret = nfs_file_fsync_commit(file, start, end, datasync); | |
307 | mutex_unlock(&inode->i_mutex); | |
dcfc4f25 TM |
308 | /* |
309 | * If nfs_file_fsync_commit detected a server reboot, then | |
310 | * resend all dirty pages that might have been covered by | |
311 | * the NFS_CONTEXT_RESEND_WRITES flag | |
312 | */ | |
313 | start = 0; | |
314 | end = LLONG_MAX; | |
05990d1b TM |
315 | } while (ret == -EAGAIN); |
316 | ||
f4ce1299 | 317 | trace_nfs_fsync_exit(inode, ret); |
af7fa165 | 318 | return ret; |
1da177e4 LT |
319 | } |
320 | ||
38c73044 PS |
321 | /* |
322 | * Decide whether a read/modify/write cycle may be more efficient | |
323 | * then a modify/write/read cycle when writing to a page in the | |
324 | * page cache. | |
325 | * | |
326 | * The modify/write/read cycle may occur if a page is read before | |
327 | * being completely filled by the writer. In this situation, the | |
328 | * page must be completely written to stable storage on the server | |
329 | * before it can be refilled by reading in the page from the server. | |
330 | * This can lead to expensive, small, FILE_SYNC mode writes being | |
331 | * done. | |
332 | * | |
333 | * It may be more efficient to read the page first if the file is | |
334 | * open for reading in addition to writing, the page is not marked | |
335 | * as Uptodate, it is not dirty or waiting to be committed, | |
336 | * indicating that it was previously allocated and then modified, | |
337 | * that there were valid bytes of data in that range of the file, | |
338 | * and that the new data won't completely replace the old data in | |
339 | * that range of the file. | |
340 | */ | |
341 | static int nfs_want_read_modify_write(struct file *file, struct page *page, | |
342 | loff_t pos, unsigned len) | |
343 | { | |
344 | unsigned int pglen = nfs_page_length(page); | |
345 | unsigned int offset = pos & (PAGE_CACHE_SIZE - 1); | |
346 | unsigned int end = offset + len; | |
347 | ||
348 | if ((file->f_mode & FMODE_READ) && /* open for read? */ | |
349 | !PageUptodate(page) && /* Uptodate? */ | |
350 | !PagePrivate(page) && /* i/o request already? */ | |
351 | pglen && /* valid bytes of file? */ | |
352 | (end < pglen || offset)) /* replace all valid bytes? */ | |
353 | return 1; | |
354 | return 0; | |
355 | } | |
356 | ||
1da177e4 | 357 | /* |
4899f9c8 NP |
358 | * This does the "real" work of the write. We must allocate and lock the |
359 | * page to be sent back to the generic routine, which then copies the | |
360 | * data from user space. | |
1da177e4 LT |
361 | * |
362 | * If the writer ends up delaying the write, the writer needs to | |
363 | * increment the page use counts until he is done with the page. | |
364 | */ | |
4899f9c8 NP |
365 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
366 | loff_t pos, unsigned len, unsigned flags, | |
367 | struct page **pagep, void **fsdata) | |
1da177e4 | 368 | { |
4899f9c8 | 369 | int ret; |
38c73044 | 370 | pgoff_t index = pos >> PAGE_CACHE_SHIFT; |
4899f9c8 | 371 | struct page *page; |
38c73044 | 372 | int once_thru = 0; |
4899f9c8 | 373 | |
b7eaefaa CL |
374 | dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", |
375 | file->f_path.dentry->d_parent->d_name.name, | |
376 | file->f_path.dentry->d_name.name, | |
377 | mapping->host->i_ino, len, (long long) pos); | |
378 | ||
38c73044 | 379 | start: |
72cb77f4 TM |
380 | /* |
381 | * Prevent starvation issues if someone is doing a consistency | |
382 | * sync-to-disk | |
383 | */ | |
384 | ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING, | |
385 | nfs_wait_bit_killable, TASK_KILLABLE); | |
386 | if (ret) | |
387 | return ret; | |
388 | ||
54566b2c | 389 | page = grab_cache_page_write_begin(mapping, index, flags); |
4899f9c8 NP |
390 | if (!page) |
391 | return -ENOMEM; | |
392 | *pagep = page; | |
393 | ||
394 | ret = nfs_flush_incompatible(file, page); | |
395 | if (ret) { | |
396 | unlock_page(page); | |
397 | page_cache_release(page); | |
38c73044 PS |
398 | } else if (!once_thru && |
399 | nfs_want_read_modify_write(file, page, pos, len)) { | |
400 | once_thru = 1; | |
401 | ret = nfs_readpage(file, page); | |
402 | page_cache_release(page); | |
403 | if (!ret) | |
404 | goto start; | |
4899f9c8 NP |
405 | } |
406 | return ret; | |
1da177e4 LT |
407 | } |
408 | ||
4899f9c8 NP |
409 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
410 | loff_t pos, unsigned len, unsigned copied, | |
411 | struct page *page, void *fsdata) | |
1da177e4 | 412 | { |
4899f9c8 | 413 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
dc24826b | 414 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
4899f9c8 | 415 | int status; |
1da177e4 | 416 | |
b7eaefaa CL |
417 | dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", |
418 | file->f_path.dentry->d_parent->d_name.name, | |
419 | file->f_path.dentry->d_name.name, | |
420 | mapping->host->i_ino, len, (long long) pos); | |
421 | ||
efc91ed0 TM |
422 | /* |
423 | * Zero any uninitialised parts of the page, and then mark the page | |
424 | * as up to date if it turns out that we're extending the file. | |
425 | */ | |
426 | if (!PageUptodate(page)) { | |
427 | unsigned pglen = nfs_page_length(page); | |
428 | unsigned end = offset + len; | |
429 | ||
430 | if (pglen == 0) { | |
431 | zero_user_segments(page, 0, offset, | |
432 | end, PAGE_CACHE_SIZE); | |
433 | SetPageUptodate(page); | |
434 | } else if (end >= pglen) { | |
435 | zero_user_segment(page, end, PAGE_CACHE_SIZE); | |
436 | if (offset == 0) | |
437 | SetPageUptodate(page); | |
438 | } else | |
439 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); | |
440 | } | |
441 | ||
4899f9c8 | 442 | status = nfs_updatepage(file, page, offset, copied); |
4899f9c8 NP |
443 | |
444 | unlock_page(page); | |
445 | page_cache_release(page); | |
446 | ||
3d509e54 CL |
447 | if (status < 0) |
448 | return status; | |
2701d086 | 449 | NFS_I(mapping->host)->write_io += copied; |
dc24826b AA |
450 | |
451 | if (nfs_ctx_key_to_expire(ctx)) { | |
452 | status = nfs_wb_all(mapping->host); | |
453 | if (status < 0) | |
454 | return status; | |
455 | } | |
456 | ||
3d509e54 | 457 | return copied; |
1da177e4 LT |
458 | } |
459 | ||
6b9b3514 DH |
460 | /* |
461 | * Partially or wholly invalidate a page | |
462 | * - Release the private state associated with a page if undergoing complete | |
463 | * page invalidation | |
545db45f | 464 | * - Called if either PG_private or PG_fscache is set on the page |
6b9b3514 DH |
465 | * - Caller holds page lock |
466 | */ | |
d47992f8 LC |
467 | static void nfs_invalidate_page(struct page *page, unsigned int offset, |
468 | unsigned int length) | |
cd52ed35 | 469 | { |
d47992f8 LC |
470 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n", |
471 | page, offset, length); | |
b7eaefaa | 472 | |
d47992f8 | 473 | if (offset != 0 || length < PAGE_CACHE_SIZE) |
1c75950b | 474 | return; |
d2ccddf0 | 475 | /* Cancel any unstarted writes on this page */ |
d56b4ddf | 476 | nfs_wb_page_cancel(page_file_mapping(page)->host, page); |
545db45f DH |
477 | |
478 | nfs_fscache_invalidate_page(page, page->mapping->host); | |
cd52ed35 TM |
479 | } |
480 | ||
6b9b3514 DH |
481 | /* |
482 | * Attempt to release the private state associated with a page | |
545db45f | 483 | * - Called if either PG_private or PG_fscache is set on the page |
6b9b3514 DH |
484 | * - Caller holds page lock |
485 | * - Return true (may release page) or false (may not) | |
486 | */ | |
cd52ed35 TM |
487 | static int nfs_release_page(struct page *page, gfp_t gfp) |
488 | { | |
b608b283 TM |
489 | struct address_space *mapping = page->mapping; |
490 | ||
b7eaefaa CL |
491 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
492 | ||
5cf02d09 JL |
493 | /* Only do I/O if gfp is a superset of GFP_KERNEL, and we're not |
494 | * doing this memory reclaim for a fs-related allocation. | |
495 | */ | |
496 | if (mapping && (gfp & GFP_KERNEL) == GFP_KERNEL && | |
497 | !(current->flags & PF_FSTRANS)) { | |
b608b283 TM |
498 | int how = FLUSH_SYNC; |
499 | ||
500 | /* Don't let kswapd deadlock waiting for OOM RPC calls */ | |
501 | if (current_is_kswapd()) | |
502 | how = 0; | |
503 | nfs_commit_inode(mapping->host, how); | |
504 | } | |
e3db7691 | 505 | /* If PagePrivate() is set, then the page is not freeable */ |
545db45f DH |
506 | if (PagePrivate(page)) |
507 | return 0; | |
508 | return nfs_fscache_release_page(page, gfp); | |
e3db7691 TM |
509 | } |
510 | ||
f919b196 MG |
511 | static void nfs_check_dirty_writeback(struct page *page, |
512 | bool *dirty, bool *writeback) | |
513 | { | |
514 | struct nfs_inode *nfsi; | |
515 | struct address_space *mapping = page_file_mapping(page); | |
516 | ||
517 | if (!mapping || PageSwapCache(page)) | |
518 | return; | |
519 | ||
520 | /* | |
521 | * Check if an unstable page is currently being committed and | |
522 | * if so, have the VM treat it as if the page is under writeback | |
523 | * so it will not block due to pages that will shortly be freeable. | |
524 | */ | |
525 | nfsi = NFS_I(mapping->host); | |
526 | if (test_bit(NFS_INO_COMMIT, &nfsi->flags)) { | |
527 | *writeback = true; | |
528 | return; | |
529 | } | |
530 | ||
531 | /* | |
532 | * If PagePrivate() is set, then the page is not freeable and as the | |
533 | * inode is not being committed, it's not going to be cleaned in the | |
534 | * near future so treat it as dirty | |
535 | */ | |
536 | if (PagePrivate(page)) | |
537 | *dirty = true; | |
538 | } | |
539 | ||
6b9b3514 DH |
540 | /* |
541 | * Attempt to clear the private state associated with a page when an error | |
542 | * occurs that requires the cached contents of an inode to be written back or | |
543 | * destroyed | |
545db45f | 544 | * - Called if either PG_private or fscache is set on the page |
6b9b3514 DH |
545 | * - Caller holds page lock |
546 | * - Return 0 if successful, -error otherwise | |
547 | */ | |
e3db7691 TM |
548 | static int nfs_launder_page(struct page *page) |
549 | { | |
d56b4ddf | 550 | struct inode *inode = page_file_mapping(page)->host; |
545db45f | 551 | struct nfs_inode *nfsi = NFS_I(inode); |
b7eaefaa CL |
552 | |
553 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", | |
554 | inode->i_ino, (long long)page_offset(page)); | |
555 | ||
545db45f | 556 | nfs_fscache_wait_on_page_write(nfsi, page); |
b7eaefaa | 557 | return nfs_wb_page(inode, page); |
cd52ed35 TM |
558 | } |
559 | ||
a564b8f0 MG |
560 | #ifdef CONFIG_NFS_SWAP |
561 | static int nfs_swap_activate(struct swap_info_struct *sis, struct file *file, | |
562 | sector_t *span) | |
563 | { | |
564 | *span = sis->pages; | |
565 | return xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 1); | |
566 | } | |
567 | ||
568 | static void nfs_swap_deactivate(struct file *file) | |
569 | { | |
570 | xs_swapper(NFS_CLIENT(file->f_mapping->host)->cl_xprt, 0); | |
571 | } | |
572 | #endif | |
573 | ||
f5e54d6e | 574 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
575 | .readpage = nfs_readpage, |
576 | .readpages = nfs_readpages, | |
9cccef95 | 577 | .set_page_dirty = __set_page_dirty_nobuffers, |
1da177e4 LT |
578 | .writepage = nfs_writepage, |
579 | .writepages = nfs_writepages, | |
4899f9c8 NP |
580 | .write_begin = nfs_write_begin, |
581 | .write_end = nfs_write_end, | |
cd52ed35 TM |
582 | .invalidatepage = nfs_invalidate_page, |
583 | .releasepage = nfs_release_page, | |
1da177e4 | 584 | .direct_IO = nfs_direct_IO, |
074cc1de | 585 | .migratepage = nfs_migrate_page, |
e3db7691 | 586 | .launder_page = nfs_launder_page, |
f919b196 | 587 | .is_dirty_writeback = nfs_check_dirty_writeback, |
f590f333 | 588 | .error_remove_page = generic_error_remove_page, |
a564b8f0 MG |
589 | #ifdef CONFIG_NFS_SWAP |
590 | .swap_activate = nfs_swap_activate, | |
591 | .swap_deactivate = nfs_swap_deactivate, | |
592 | #endif | |
1da177e4 LT |
593 | }; |
594 | ||
6b9b3514 DH |
595 | /* |
596 | * Notification that a PTE pointing to an NFS page is about to be made | |
597 | * writable, implying that someone is about to modify the page through a | |
598 | * shared-writable mapping | |
599 | */ | |
c2ec175c | 600 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
94387fb1 | 601 | { |
c2ec175c | 602 | struct page *page = vmf->page; |
94387fb1 | 603 | struct file *filp = vma->vm_file; |
b7eaefaa | 604 | struct dentry *dentry = filp->f_path.dentry; |
94387fb1 | 605 | unsigned pagelen; |
bc4866b6 | 606 | int ret = VM_FAULT_NOPAGE; |
4899f9c8 | 607 | struct address_space *mapping; |
94387fb1 | 608 | |
b7eaefaa CL |
609 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", |
610 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
611 | filp->f_mapping->host->i_ino, | |
612 | (long long)page_offset(page)); | |
613 | ||
545db45f DH |
614 | /* make sure the cache has finished storing the page */ |
615 | nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page); | |
616 | ||
94387fb1 | 617 | lock_page(page); |
d56b4ddf | 618 | mapping = page_file_mapping(page); |
b7eaefaa | 619 | if (mapping != dentry->d_inode->i_mapping) |
8b1f9ee5 TM |
620 | goto out_unlock; |
621 | ||
2aeb98f4 TM |
622 | wait_on_page_writeback(page); |
623 | ||
94387fb1 | 624 | pagelen = nfs_page_length(page); |
8b1f9ee5 TM |
625 | if (pagelen == 0) |
626 | goto out_unlock; | |
4899f9c8 | 627 | |
bc4866b6 TM |
628 | ret = VM_FAULT_LOCKED; |
629 | if (nfs_flush_incompatible(filp, page) == 0 && | |
630 | nfs_updatepage(filp, page, 0, pagelen) == 0) | |
631 | goto out; | |
8b1f9ee5 | 632 | |
bc4866b6 | 633 | ret = VM_FAULT_SIGBUS; |
8b1f9ee5 TM |
634 | out_unlock: |
635 | unlock_page(page); | |
bc4866b6 TM |
636 | out: |
637 | return ret; | |
94387fb1 TM |
638 | } |
639 | ||
f0f37e2f | 640 | static const struct vm_operations_struct nfs_file_vm_ops = { |
94387fb1 TM |
641 | .fault = filemap_fault, |
642 | .page_mkwrite = nfs_vm_page_mkwrite, | |
0b173bc4 | 643 | .remap_pages = generic_file_remap_pages, |
94387fb1 TM |
644 | }; |
645 | ||
7b159fc1 TM |
646 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
647 | { | |
648 | struct nfs_open_context *ctx; | |
649 | ||
6b2f3d1f | 650 | if (IS_SYNC(inode) || (filp->f_flags & O_DSYNC)) |
7b159fc1 | 651 | return 1; |
cd3758e3 | 652 | ctx = nfs_file_open_context(filp); |
dc24826b AA |
653 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags) || |
654 | nfs_ctx_key_to_expire(ctx)) | |
7b159fc1 TM |
655 | return 1; |
656 | return 0; | |
657 | } | |
658 | ||
ce4ef7c0 BS |
659 | ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
660 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 661 | { |
01cce933 | 662 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 | 663 | struct inode * inode = dentry->d_inode; |
7e381172 | 664 | unsigned long written = 0; |
1da177e4 | 665 | ssize_t result; |
027445c3 | 666 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 667 | |
dc24826b AA |
668 | result = nfs_key_timeout_notify(iocb->ki_filp, inode); |
669 | if (result) | |
670 | return result; | |
671 | ||
1da177e4 | 672 | if (iocb->ki_filp->f_flags & O_DIRECT) |
a564b8f0 | 673 | return nfs_file_direct_write(iocb, iov, nr_segs, pos, true); |
1da177e4 | 674 | |
6da24bc9 | 675 | dprintk("NFS: write(%s/%s, %lu@%Ld)\n", |
1da177e4 | 676 | dentry->d_parent->d_name.name, dentry->d_name.name, |
6da24bc9 | 677 | (unsigned long) count, (long long) pos); |
1da177e4 LT |
678 | |
679 | result = -EBUSY; | |
680 | if (IS_SWAPFILE(inode)) | |
681 | goto out_swapfile; | |
7d52e862 TM |
682 | /* |
683 | * O_APPEND implies that we must revalidate the file length. | |
684 | */ | |
685 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
686 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
687 | if (result) | |
688 | goto out; | |
fe51beec | 689 | } |
1da177e4 LT |
690 | |
691 | result = count; | |
692 | if (!count) | |
693 | goto out; | |
694 | ||
027445c3 | 695 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
7e381172 CL |
696 | if (result > 0) |
697 | written = result; | |
698 | ||
6b2f3d1f | 699 | /* Return error values for O_DSYNC and IS_SYNC() */ |
7b159fc1 | 700 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
af7fa165 | 701 | int err = vfs_fsync(iocb->ki_filp, 0); |
200baa21 TM |
702 | if (err < 0) |
703 | result = err; | |
704 | } | |
7e381172 CL |
705 | if (result > 0) |
706 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); | |
1da177e4 LT |
707 | out: |
708 | return result; | |
709 | ||
710 | out_swapfile: | |
711 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
712 | goto out; | |
713 | } | |
89d77c8f | 714 | EXPORT_SYMBOL_GPL(nfs_file_write); |
1da177e4 | 715 | |
ce4ef7c0 BS |
716 | ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, |
717 | struct file *filp, loff_t *ppos, | |
718 | size_t count, unsigned int flags) | |
bf40d343 SJ |
719 | { |
720 | struct dentry *dentry = filp->f_path.dentry; | |
721 | struct inode *inode = dentry->d_inode; | |
7e381172 | 722 | unsigned long written = 0; |
bf40d343 SJ |
723 | ssize_t ret; |
724 | ||
725 | dprintk("NFS splice_write(%s/%s, %lu@%llu)\n", | |
726 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
727 | (unsigned long) count, (unsigned long long) *ppos); | |
728 | ||
729 | /* | |
730 | * The combination of splice and an O_APPEND destination is disallowed. | |
731 | */ | |
732 | ||
bf40d343 | 733 | ret = generic_file_splice_write(pipe, filp, ppos, count, flags); |
7e381172 CL |
734 | if (ret > 0) |
735 | written = ret; | |
736 | ||
bf40d343 | 737 | if (ret >= 0 && nfs_need_sync_write(filp, inode)) { |
af7fa165 | 738 | int err = vfs_fsync(filp, 0); |
bf40d343 SJ |
739 | if (err < 0) |
740 | ret = err; | |
741 | } | |
7e381172 CL |
742 | if (ret > 0) |
743 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); | |
bf40d343 SJ |
744 | return ret; |
745 | } | |
89d77c8f | 746 | EXPORT_SYMBOL_GPL(nfs_file_splice_write); |
bf40d343 | 747 | |
5eebde23 SJ |
748 | static int |
749 | do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) | |
1da177e4 LT |
750 | { |
751 | struct inode *inode = filp->f_mapping->host; | |
752 | int status = 0; | |
21ac19d4 | 753 | unsigned int saved_type = fl->fl_type; |
1da177e4 | 754 | |
039c4d7a | 755 | /* Try local locking first */ |
6d34ac19 BF |
756 | posix_test_lock(filp, fl); |
757 | if (fl->fl_type != F_UNLCK) { | |
758 | /* found a conflict */ | |
039c4d7a | 759 | goto out; |
1da177e4 | 760 | } |
21ac19d4 | 761 | fl->fl_type = saved_type; |
039c4d7a | 762 | |
011e2a7f | 763 | if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) |
039c4d7a TM |
764 | goto out_noconflict; |
765 | ||
5eebde23 | 766 | if (is_local) |
039c4d7a TM |
767 | goto out_noconflict; |
768 | ||
769 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
770 | out: | |
1da177e4 | 771 | return status; |
039c4d7a TM |
772 | out_noconflict: |
773 | fl->fl_type = F_UNLCK; | |
774 | goto out; | |
1da177e4 LT |
775 | } |
776 | ||
777 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
778 | { | |
779 | int res = 0; | |
780 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
781 | case FL_POSIX: | |
782 | res = posix_lock_file_wait(file, fl); | |
783 | break; | |
784 | case FL_FLOCK: | |
785 | res = flock_lock_file_wait(file, fl); | |
786 | break; | |
787 | default: | |
788 | BUG(); | |
789 | } | |
1da177e4 LT |
790 | return res; |
791 | } | |
792 | ||
5eebde23 SJ |
793 | static int |
794 | do_unlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) | |
1da177e4 LT |
795 | { |
796 | struct inode *inode = filp->f_mapping->host; | |
7a8203d8 | 797 | struct nfs_lock_context *l_ctx; |
1da177e4 LT |
798 | int status; |
799 | ||
1da177e4 LT |
800 | /* |
801 | * Flush all pending writes before doing anything | |
802 | * with locks.. | |
803 | */ | |
29884df0 | 804 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 | 805 | |
7a8203d8 TM |
806 | l_ctx = nfs_get_lock_context(nfs_file_open_context(filp)); |
807 | if (!IS_ERR(l_ctx)) { | |
808 | status = nfs_iocounter_wait(&l_ctx->io_count); | |
809 | nfs_put_lock_context(l_ctx); | |
810 | if (status < 0) | |
811 | return status; | |
812 | } | |
813 | ||
1da177e4 LT |
814 | /* NOTE: special case |
815 | * If we're signalled while cleaning up locks on process exit, we | |
816 | * still need to complete the unlock. | |
817 | */ | |
5eebde23 SJ |
818 | /* |
819 | * Use local locking if mounted with "-onolock" or with appropriate | |
820 | * "-olocal_lock=" | |
821 | */ | |
822 | if (!is_local) | |
1da177e4 LT |
823 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
824 | else | |
825 | status = do_vfs_lock(filp, fl); | |
1da177e4 LT |
826 | return status; |
827 | } | |
828 | ||
6b96724e RL |
829 | static int |
830 | is_time_granular(struct timespec *ts) { | |
831 | return ((ts->tv_sec == 0) && (ts->tv_nsec <= 1000)); | |
832 | } | |
833 | ||
5eebde23 SJ |
834 | static int |
835 | do_setlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) | |
1da177e4 LT |
836 | { |
837 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
838 | int status; |
839 | ||
1da177e4 LT |
840 | /* |
841 | * Flush all pending writes before doing anything | |
842 | * with locks.. | |
843 | */ | |
29884df0 TM |
844 | status = nfs_sync_mapping(filp->f_mapping); |
845 | if (status != 0) | |
1da177e4 LT |
846 | goto out; |
847 | ||
5eebde23 SJ |
848 | /* |
849 | * Use local locking if mounted with "-onolock" or with appropriate | |
850 | * "-olocal_lock=" | |
851 | */ | |
852 | if (!is_local) | |
1da177e4 | 853 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
c4d7c402 | 854 | else |
1da177e4 | 855 | status = do_vfs_lock(filp, fl); |
1da177e4 LT |
856 | if (status < 0) |
857 | goto out; | |
6b96724e | 858 | |
1da177e4 | 859 | /* |
6b96724e RL |
860 | * Revalidate the cache if the server has time stamps granular |
861 | * enough to detect subsecond changes. Otherwise, clear the | |
862 | * cache to prevent missing any changes. | |
863 | * | |
1da177e4 LT |
864 | * This makes locking act as a cache coherency point. |
865 | */ | |
29884df0 | 866 | nfs_sync_mapping(filp->f_mapping); |
011e2a7f | 867 | if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) { |
6b96724e RL |
868 | if (is_time_granular(&NFS_SERVER(inode)->time_delta)) |
869 | __nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
870 | else | |
871 | nfs_zap_caches(inode); | |
872 | } | |
1da177e4 | 873 | out: |
1da177e4 LT |
874 | return status; |
875 | } | |
876 | ||
877 | /* | |
878 | * Lock a (portion of) a file | |
879 | */ | |
ce4ef7c0 | 880 | int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) |
1da177e4 | 881 | { |
6da24bc9 | 882 | struct inode *inode = filp->f_mapping->host; |
2116271a | 883 | int ret = -ENOLCK; |
5eebde23 | 884 | int is_local = 0; |
1da177e4 | 885 | |
6da24bc9 CL |
886 | dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", |
887 | filp->f_path.dentry->d_parent->d_name.name, | |
888 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
889 | fl->fl_type, fl->fl_flags, |
890 | (long long)fl->fl_start, (long long)fl->fl_end); | |
6da24bc9 | 891 | |
91d5b470 | 892 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
893 | |
894 | /* No mandatory locks over NFS */ | |
dfad9441 | 895 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
2116271a TM |
896 | goto out_err; |
897 | ||
5eebde23 SJ |
898 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FCNTL) |
899 | is_local = 1; | |
900 | ||
2116271a TM |
901 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { |
902 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); | |
903 | if (ret < 0) | |
904 | goto out_err; | |
905 | } | |
1da177e4 LT |
906 | |
907 | if (IS_GETLK(cmd)) | |
5eebde23 | 908 | ret = do_getlk(filp, cmd, fl, is_local); |
2116271a | 909 | else if (fl->fl_type == F_UNLCK) |
5eebde23 | 910 | ret = do_unlk(filp, cmd, fl, is_local); |
2116271a | 911 | else |
5eebde23 | 912 | ret = do_setlk(filp, cmd, fl, is_local); |
2116271a TM |
913 | out_err: |
914 | return ret; | |
1da177e4 | 915 | } |
89d77c8f | 916 | EXPORT_SYMBOL_GPL(nfs_lock); |
1da177e4 LT |
917 | |
918 | /* | |
919 | * Lock a (portion of) a file | |
920 | */ | |
ce4ef7c0 | 921 | int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) |
1da177e4 | 922 | { |
5eebde23 SJ |
923 | struct inode *inode = filp->f_mapping->host; |
924 | int is_local = 0; | |
925 | ||
6da24bc9 CL |
926 | dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", |
927 | filp->f_path.dentry->d_parent->d_name.name, | |
928 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
929 | fl->fl_type, fl->fl_flags); |
930 | ||
1da177e4 LT |
931 | if (!(fl->fl_flags & FL_FLOCK)) |
932 | return -ENOLCK; | |
933 | ||
ad0fcd4e JL |
934 | /* |
935 | * The NFSv4 protocol doesn't support LOCK_MAND, which is not part of | |
936 | * any standard. In principle we might be able to support LOCK_MAND | |
937 | * on NFSv2/3 since NLMv3/4 support DOS share modes, but for now the | |
938 | * NFS code is not set up for it. | |
939 | */ | |
940 | if (fl->fl_type & LOCK_MAND) | |
941 | return -EINVAL; | |
942 | ||
5eebde23 SJ |
943 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_LOCAL_FLOCK) |
944 | is_local = 1; | |
945 | ||
1da177e4 LT |
946 | /* We're simulating flock() locks using posix locks on the server */ |
947 | fl->fl_owner = (fl_owner_t)filp; | |
948 | fl->fl_start = 0; | |
949 | fl->fl_end = OFFSET_MAX; | |
950 | ||
951 | if (fl->fl_type == F_UNLCK) | |
5eebde23 SJ |
952 | return do_unlk(filp, cmd, fl, is_local); |
953 | return do_setlk(filp, cmd, fl, is_local); | |
1da177e4 | 954 | } |
89d77c8f | 955 | EXPORT_SYMBOL_GPL(nfs_flock); |
370f6599 | 956 | |
6da24bc9 CL |
957 | /* |
958 | * There is no protocol support for leases, so we have no way to implement | |
959 | * them correctly in the face of opens by other clients. | |
960 | */ | |
ce4ef7c0 | 961 | int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
370f6599 | 962 | { |
6da24bc9 CL |
963 | dprintk("NFS: setlease(%s/%s, arg=%ld)\n", |
964 | file->f_path.dentry->d_parent->d_name.name, | |
965 | file->f_path.dentry->d_name.name, arg); | |
370f6599 BF |
966 | return -EINVAL; |
967 | } | |
89d77c8f | 968 | EXPORT_SYMBOL_GPL(nfs_setlease); |
1788ea6e | 969 | |
0486958f JL |
970 | const struct file_operations nfs_file_operations = { |
971 | .llseek = nfs_file_llseek, | |
972 | .read = do_sync_read, | |
973 | .write = do_sync_write, | |
974 | .aio_read = nfs_file_read, | |
975 | .aio_write = nfs_file_write, | |
976 | .mmap = nfs_file_mmap, | |
977 | .open = nfs_file_open, | |
978 | .flush = nfs_file_flush, | |
979 | .release = nfs_file_release, | |
980 | .fsync = nfs_file_fsync, | |
981 | .lock = nfs_lock, | |
982 | .flock = nfs_flock, | |
983 | .splice_read = nfs_file_splice_read, | |
984 | .splice_write = nfs_file_splice_write, | |
985 | .check_flags = nfs_check_flags, | |
986 | .setlease = nfs_setlease, | |
987 | }; | |
ddda8e0a | 988 | EXPORT_SYMBOL_GPL(nfs_file_operations); |