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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/file.c | |
3 | * | |
4 | * Copyright (C) 1992 Rick Sladkey | |
5 | * | |
6 | * Changes Copyright (C) 1994 by Florian La Roche | |
7 | * - Do not copy data too often around in the kernel. | |
8 | * - In nfs_file_read the return value of kmalloc wasn't checked. | |
9 | * - Put in a better version of read look-ahead buffering. Original idea | |
10 | * and implementation by Wai S Kok elekokws@ee.nus.sg. | |
11 | * | |
12 | * Expire cache on write to a file by Wai S Kok (Oct 1994). | |
13 | * | |
14 | * Total rewrite of read side for new NFS buffer cache.. Linus. | |
15 | * | |
16 | * nfs regular file handling functions | |
17 | */ | |
18 | ||
19 | #include <linux/time.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/errno.h> | |
22 | #include <linux/fcntl.h> | |
23 | #include <linux/stat.h> | |
24 | #include <linux/nfs_fs.h> | |
25 | #include <linux/nfs_mount.h> | |
26 | #include <linux/mm.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/pagemap.h> | |
29 | #include <linux/smp_lock.h> | |
e8edc6e0 | 30 | #include <linux/aio.h> |
1da177e4 LT |
31 | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/system.h> | |
34 | ||
35 | #include "delegation.h" | |
91d5b470 | 36 | #include "iostat.h" |
1da177e4 LT |
37 | |
38 | #define NFSDBG_FACILITY NFSDBG_FILE | |
39 | ||
40 | static int nfs_file_open(struct inode *, struct file *); | |
41 | static int nfs_file_release(struct inode *, struct file *); | |
980802e3 | 42 | static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin); |
1da177e4 | 43 | static int nfs_file_mmap(struct file *, struct vm_area_struct *); |
f0930fff JA |
44 | static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos, |
45 | struct pipe_inode_info *pipe, | |
46 | size_t count, unsigned int flags); | |
027445c3 BP |
47 | static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov, |
48 | unsigned long nr_segs, loff_t pos); | |
49 | static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, | |
50 | unsigned long nr_segs, loff_t pos); | |
75e1fcc0 | 51 | static int nfs_file_flush(struct file *, fl_owner_t id); |
1da177e4 LT |
52 | static int nfs_fsync(struct file *, struct dentry *dentry, int datasync); |
53 | static int nfs_check_flags(int flags); | |
54 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); | |
55 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); | |
370f6599 | 56 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl); |
1da177e4 | 57 | |
4b6f5d20 | 58 | const struct file_operations nfs_file_operations = { |
980802e3 | 59 | .llseek = nfs_file_llseek, |
1da177e4 LT |
60 | .read = do_sync_read, |
61 | .write = do_sync_write, | |
027445c3 BP |
62 | .aio_read = nfs_file_read, |
63 | .aio_write = nfs_file_write, | |
1da177e4 LT |
64 | .mmap = nfs_file_mmap, |
65 | .open = nfs_file_open, | |
66 | .flush = nfs_file_flush, | |
67 | .release = nfs_file_release, | |
68 | .fsync = nfs_fsync, | |
69 | .lock = nfs_lock, | |
70 | .flock = nfs_flock, | |
f0930fff | 71 | .splice_read = nfs_file_splice_read, |
1da177e4 | 72 | .check_flags = nfs_check_flags, |
370f6599 | 73 | .setlease = nfs_setlease, |
1da177e4 LT |
74 | }; |
75 | ||
92e1d5be | 76 | const struct inode_operations nfs_file_inode_operations = { |
1da177e4 LT |
77 | .permission = nfs_permission, |
78 | .getattr = nfs_getattr, | |
79 | .setattr = nfs_setattr, | |
80 | }; | |
81 | ||
b7fa0554 | 82 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 83 | const struct inode_operations nfs3_file_inode_operations = { |
b7fa0554 AG |
84 | .permission = nfs_permission, |
85 | .getattr = nfs_getattr, | |
86 | .setattr = nfs_setattr, | |
87 | .listxattr = nfs3_listxattr, | |
88 | .getxattr = nfs3_getxattr, | |
89 | .setxattr = nfs3_setxattr, | |
90 | .removexattr = nfs3_removexattr, | |
91 | }; | |
92 | #endif /* CONFIG_NFS_v3 */ | |
93 | ||
1da177e4 LT |
94 | /* Hack for future NFS swap support */ |
95 | #ifndef IS_SWAPFILE | |
96 | # define IS_SWAPFILE(inode) (0) | |
97 | #endif | |
98 | ||
99 | static int nfs_check_flags(int flags) | |
100 | { | |
101 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
102 | return -EINVAL; | |
103 | ||
104 | return 0; | |
105 | } | |
106 | ||
107 | /* | |
108 | * Open file | |
109 | */ | |
110 | static int | |
111 | nfs_file_open(struct inode *inode, struct file *filp) | |
112 | { | |
1da177e4 LT |
113 | int res; |
114 | ||
115 | res = nfs_check_flags(filp->f_flags); | |
116 | if (res) | |
117 | return res; | |
118 | ||
91d5b470 | 119 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
1da177e4 | 120 | lock_kernel(); |
1f163415 | 121 | res = NFS_PROTO(inode)->file_open(inode, filp); |
1da177e4 LT |
122 | unlock_kernel(); |
123 | return res; | |
124 | } | |
125 | ||
126 | static int | |
127 | nfs_file_release(struct inode *inode, struct file *filp) | |
128 | { | |
129 | /* Ensure that dirty pages are flushed out with the right creds */ | |
130 | if (filp->f_mode & FMODE_WRITE) | |
131 | filemap_fdatawrite(filp->f_mapping); | |
91d5b470 | 132 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
1da177e4 LT |
133 | return NFS_PROTO(inode)->file_release(inode, filp); |
134 | } | |
135 | ||
980802e3 TM |
136 | /** |
137 | * nfs_revalidate_size - Revalidate the file size | |
138 | * @inode - pointer to inode struct | |
139 | * @file - pointer to struct file | |
140 | * | |
141 | * Revalidates the file length. This is basically a wrapper around | |
142 | * nfs_revalidate_inode() that takes into account the fact that we may | |
143 | * have cached writes (in which case we don't care about the server's | |
144 | * idea of what the file length is), or O_DIRECT (in which case we | |
145 | * shouldn't trust the cache). | |
146 | */ | |
147 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
148 | { | |
149 | struct nfs_server *server = NFS_SERVER(inode); | |
150 | struct nfs_inode *nfsi = NFS_I(inode); | |
151 | ||
152 | if (server->flags & NFS_MOUNT_NOAC) | |
153 | goto force_reval; | |
154 | if (filp->f_flags & O_DIRECT) | |
155 | goto force_reval; | |
156 | if (nfsi->npages != 0) | |
157 | return 0; | |
55296809 | 158 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
fe51beec | 159 | return 0; |
980802e3 TM |
160 | force_reval: |
161 | return __nfs_revalidate_inode(server, inode); | |
162 | } | |
163 | ||
164 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
165 | { | |
166 | /* origin == SEEK_END => we must revalidate the cached file length */ | |
aec5e175 | 167 | if (origin == SEEK_END) { |
980802e3 TM |
168 | struct inode *inode = filp->f_mapping->host; |
169 | int retval = nfs_revalidate_file_size(inode, filp); | |
170 | if (retval < 0) | |
171 | return (loff_t)retval; | |
172 | } | |
173 | return remote_llseek(filp, offset, origin); | |
174 | } | |
175 | ||
1da177e4 LT |
176 | /* |
177 | * Flush all dirty pages, and check for write errors. | |
178 | * | |
179 | */ | |
180 | static int | |
75e1fcc0 | 181 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 LT |
182 | { |
183 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
01cce933 | 184 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
185 | int status; |
186 | ||
187 | dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
188 | ||
189 | if ((file->f_mode & FMODE_WRITE) == 0) | |
190 | return 0; | |
91d5b470 | 191 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
1da177e4 LT |
192 | lock_kernel(); |
193 | /* Ensure that data+attribute caches are up to date after close() */ | |
194 | status = nfs_wb_all(inode); | |
195 | if (!status) { | |
196 | status = ctx->error; | |
197 | ctx->error = 0; | |
3338c143 TM |
198 | if (!status) |
199 | nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1da177e4 LT |
200 | } |
201 | unlock_kernel(); | |
202 | return status; | |
203 | } | |
204 | ||
205 | static ssize_t | |
027445c3 BP |
206 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
207 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 208 | { |
01cce933 | 209 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
210 | struct inode * inode = dentry->d_inode; |
211 | ssize_t result; | |
027445c3 | 212 | size_t count = iov_length(iov, nr_segs); |
1da177e4 LT |
213 | |
214 | #ifdef CONFIG_NFS_DIRECTIO | |
215 | if (iocb->ki_filp->f_flags & O_DIRECT) | |
027445c3 | 216 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
217 | #endif |
218 | ||
219 | dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n", | |
220 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
221 | (unsigned long) count, (unsigned long) pos); | |
222 | ||
44b11874 | 223 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
91d5b470 | 224 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
1da177e4 | 225 | if (!result) |
027445c3 | 226 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
227 | return result; |
228 | } | |
229 | ||
230 | static ssize_t | |
f0930fff JA |
231 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
232 | struct pipe_inode_info *pipe, size_t count, | |
233 | unsigned int flags) | |
1da177e4 | 234 | { |
01cce933 | 235 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
236 | struct inode *inode = dentry->d_inode; |
237 | ssize_t res; | |
238 | ||
f0930fff | 239 | dfprintk(VFS, "nfs: splice_read(%s/%s, %lu@%Lu)\n", |
1da177e4 LT |
240 | dentry->d_parent->d_name.name, dentry->d_name.name, |
241 | (unsigned long) count, (unsigned long long) *ppos); | |
242 | ||
44b11874 | 243 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
1da177e4 | 244 | if (!res) |
f0930fff | 245 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
1da177e4 LT |
246 | return res; |
247 | } | |
248 | ||
249 | static int | |
250 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) | |
251 | { | |
01cce933 | 252 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
253 | struct inode *inode = dentry->d_inode; |
254 | int status; | |
255 | ||
256 | dfprintk(VFS, "nfs: mmap(%s/%s)\n", | |
257 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
258 | ||
44b11874 | 259 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
1da177e4 LT |
260 | if (!status) |
261 | status = generic_file_mmap(file, vma); | |
262 | return status; | |
263 | } | |
264 | ||
265 | /* | |
266 | * Flush any dirty pages for this process, and check for write errors. | |
267 | * The return status from this call provides a reliable indication of | |
268 | * whether any write errors occurred for this process. | |
269 | */ | |
270 | static int | |
271 | nfs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
272 | { | |
273 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
274 | struct inode *inode = dentry->d_inode; | |
275 | int status; | |
276 | ||
277 | dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
278 | ||
91d5b470 | 279 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
280 | lock_kernel(); |
281 | status = nfs_wb_all(inode); | |
282 | if (!status) { | |
283 | status = ctx->error; | |
284 | ctx->error = 0; | |
285 | } | |
286 | unlock_kernel(); | |
287 | return status; | |
288 | } | |
289 | ||
290 | /* | |
291 | * This does the "real" work of the write. The generic routine has | |
292 | * allocated the page, locked it, done all the page alignment stuff | |
293 | * calculations etc. Now we should just copy the data from user | |
294 | * space and write it back to the real medium.. | |
295 | * | |
296 | * If the writer ends up delaying the write, the writer needs to | |
297 | * increment the page use counts until he is done with the page. | |
298 | */ | |
299 | static int nfs_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to) | |
300 | { | |
301 | return nfs_flush_incompatible(file, page); | |
302 | } | |
303 | ||
304 | static int nfs_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to) | |
305 | { | |
306 | long status; | |
307 | ||
308 | lock_kernel(); | |
309 | status = nfs_updatepage(file, page, offset, to-offset); | |
310 | unlock_kernel(); | |
311 | return status; | |
312 | } | |
313 | ||
2ff28e22 | 314 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 | 315 | { |
1c75950b TM |
316 | if (offset != 0) |
317 | return; | |
d2ccddf0 | 318 | /* Cancel any unstarted writes on this page */ |
61822ab5 | 319 | nfs_wb_page_priority(page->mapping->host, page, FLUSH_INVALIDATE); |
cd52ed35 TM |
320 | } |
321 | ||
322 | static int nfs_release_page(struct page *page, gfp_t gfp) | |
323 | { | |
e3db7691 TM |
324 | /* If PagePrivate() is set, then the page is not freeable */ |
325 | return 0; | |
326 | } | |
327 | ||
328 | static int nfs_launder_page(struct page *page) | |
329 | { | |
330 | return nfs_wb_page(page->mapping->host, page); | |
cd52ed35 TM |
331 | } |
332 | ||
f5e54d6e | 333 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
334 | .readpage = nfs_readpage, |
335 | .readpages = nfs_readpages, | |
1a54533e | 336 | .set_page_dirty = nfs_set_page_dirty, |
1da177e4 LT |
337 | .writepage = nfs_writepage, |
338 | .writepages = nfs_writepages, | |
339 | .prepare_write = nfs_prepare_write, | |
340 | .commit_write = nfs_commit_write, | |
cd52ed35 TM |
341 | .invalidatepage = nfs_invalidate_page, |
342 | .releasepage = nfs_release_page, | |
1da177e4 LT |
343 | #ifdef CONFIG_NFS_DIRECTIO |
344 | .direct_IO = nfs_direct_IO, | |
345 | #endif | |
e3db7691 | 346 | .launder_page = nfs_launder_page, |
1da177e4 LT |
347 | }; |
348 | ||
027445c3 BP |
349 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
350 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 351 | { |
01cce933 | 352 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
353 | struct inode * inode = dentry->d_inode; |
354 | ssize_t result; | |
027445c3 | 355 | size_t count = iov_length(iov, nr_segs); |
1da177e4 LT |
356 | |
357 | #ifdef CONFIG_NFS_DIRECTIO | |
358 | if (iocb->ki_filp->f_flags & O_DIRECT) | |
027445c3 | 359 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
1da177e4 LT |
360 | #endif |
361 | ||
027445c3 | 362 | dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%Ld)\n", |
1da177e4 | 363 | dentry->d_parent->d_name.name, dentry->d_name.name, |
027445c3 | 364 | inode->i_ino, (unsigned long) count, (long long) pos); |
1da177e4 LT |
365 | |
366 | result = -EBUSY; | |
367 | if (IS_SWAPFILE(inode)) | |
368 | goto out_swapfile; | |
7d52e862 TM |
369 | /* |
370 | * O_APPEND implies that we must revalidate the file length. | |
371 | */ | |
372 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
373 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
374 | if (result) | |
375 | goto out; | |
fe51beec | 376 | } |
1da177e4 LT |
377 | |
378 | result = count; | |
379 | if (!count) | |
380 | goto out; | |
381 | ||
91d5b470 | 382 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
027445c3 | 383 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
200baa21 TM |
384 | /* Return error values for O_SYNC and IS_SYNC() */ |
385 | if (result >= 0 && (IS_SYNC(inode) || (iocb->ki_filp->f_flags & O_SYNC))) { | |
386 | int err = nfs_fsync(iocb->ki_filp, dentry, 1); | |
387 | if (err < 0) | |
388 | result = err; | |
389 | } | |
1da177e4 LT |
390 | out: |
391 | return result; | |
392 | ||
393 | out_swapfile: | |
394 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
395 | goto out; | |
396 | } | |
397 | ||
398 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) | |
399 | { | |
400 | struct inode *inode = filp->f_mapping->host; | |
401 | int status = 0; | |
402 | ||
403 | lock_kernel(); | |
039c4d7a | 404 | /* Try local locking first */ |
6d34ac19 BF |
405 | posix_test_lock(filp, fl); |
406 | if (fl->fl_type != F_UNLCK) { | |
407 | /* found a conflict */ | |
039c4d7a | 408 | goto out; |
1da177e4 | 409 | } |
039c4d7a TM |
410 | |
411 | if (nfs_have_delegation(inode, FMODE_READ)) | |
412 | goto out_noconflict; | |
413 | ||
414 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) | |
415 | goto out_noconflict; | |
416 | ||
417 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
418 | out: | |
1da177e4 LT |
419 | unlock_kernel(); |
420 | return status; | |
039c4d7a TM |
421 | out_noconflict: |
422 | fl->fl_type = F_UNLCK; | |
423 | goto out; | |
1da177e4 LT |
424 | } |
425 | ||
426 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
427 | { | |
428 | int res = 0; | |
429 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
430 | case FL_POSIX: | |
431 | res = posix_lock_file_wait(file, fl); | |
432 | break; | |
433 | case FL_FLOCK: | |
434 | res = flock_lock_file_wait(file, fl); | |
435 | break; | |
436 | default: | |
437 | BUG(); | |
438 | } | |
439 | if (res < 0) | |
46bae1a9 NB |
440 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
441 | " - error %d!\n", | |
442 | __FUNCTION__, res); | |
1da177e4 LT |
443 | return res; |
444 | } | |
445 | ||
446 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) | |
447 | { | |
448 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
449 | int status; |
450 | ||
1da177e4 LT |
451 | /* |
452 | * Flush all pending writes before doing anything | |
453 | * with locks.. | |
454 | */ | |
29884df0 | 455 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
456 | |
457 | /* NOTE: special case | |
458 | * If we're signalled while cleaning up locks on process exit, we | |
459 | * still need to complete the unlock. | |
460 | */ | |
461 | lock_kernel(); | |
462 | /* Use local locking if mounted with "-onolock" */ | |
463 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) | |
464 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
465 | else | |
466 | status = do_vfs_lock(filp, fl); | |
467 | unlock_kernel(); | |
1da177e4 LT |
468 | return status; |
469 | } | |
470 | ||
471 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) | |
472 | { | |
473 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
474 | int status; |
475 | ||
1da177e4 LT |
476 | /* |
477 | * Flush all pending writes before doing anything | |
478 | * with locks.. | |
479 | */ | |
29884df0 TM |
480 | status = nfs_sync_mapping(filp->f_mapping); |
481 | if (status != 0) | |
1da177e4 LT |
482 | goto out; |
483 | ||
484 | lock_kernel(); | |
485 | /* Use local locking if mounted with "-onolock" */ | |
486 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) { | |
487 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
488 | /* If we were signalled we still need to ensure that | |
489 | * we clean up any state on the server. We therefore | |
490 | * record the lock call as having succeeded in order to | |
491 | * ensure that locks_remove_posix() cleans it out when | |
492 | * the process exits. | |
493 | */ | |
494 | if (status == -EINTR || status == -ERESTARTSYS) | |
495 | do_vfs_lock(filp, fl); | |
496 | } else | |
497 | status = do_vfs_lock(filp, fl); | |
498 | unlock_kernel(); | |
499 | if (status < 0) | |
500 | goto out; | |
501 | /* | |
502 | * Make sure we clear the cache whenever we try to get the lock. | |
503 | * This makes locking act as a cache coherency point. | |
504 | */ | |
29884df0 | 505 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
506 | nfs_zap_caches(inode); |
507 | out: | |
1da177e4 LT |
508 | return status; |
509 | } | |
510 | ||
511 | /* | |
512 | * Lock a (portion of) a file | |
513 | */ | |
514 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
515 | { | |
516 | struct inode * inode = filp->f_mapping->host; | |
517 | ||
518 | dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n", | |
519 | inode->i_sb->s_id, inode->i_ino, | |
520 | fl->fl_type, fl->fl_flags, | |
521 | (long long)fl->fl_start, (long long)fl->fl_end); | |
91d5b470 | 522 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
523 | |
524 | /* No mandatory locks over NFS */ | |
0800c5f7 AM |
525 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID && |
526 | fl->fl_type != F_UNLCK) | |
1da177e4 LT |
527 | return -ENOLCK; |
528 | ||
529 | if (IS_GETLK(cmd)) | |
530 | return do_getlk(filp, cmd, fl); | |
531 | if (fl->fl_type == F_UNLCK) | |
532 | return do_unlk(filp, cmd, fl); | |
533 | return do_setlk(filp, cmd, fl); | |
534 | } | |
535 | ||
536 | /* | |
537 | * Lock a (portion of) a file | |
538 | */ | |
539 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
540 | { | |
1da177e4 | 541 | dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n", |
01cce933 JJS |
542 | filp->f_path.dentry->d_inode->i_sb->s_id, |
543 | filp->f_path.dentry->d_inode->i_ino, | |
1da177e4 LT |
544 | fl->fl_type, fl->fl_flags); |
545 | ||
1da177e4 LT |
546 | /* |
547 | * No BSD flocks over NFS allowed. | |
548 | * Note: we could try to fake a POSIX lock request here by | |
549 | * using ((u32) filp | 0x80000000) or some such as the pid. | |
550 | * Not sure whether that would be unique, though, or whether | |
551 | * that would break in other places. | |
552 | */ | |
553 | if (!(fl->fl_flags & FL_FLOCK)) | |
554 | return -ENOLCK; | |
555 | ||
556 | /* We're simulating flock() locks using posix locks on the server */ | |
557 | fl->fl_owner = (fl_owner_t)filp; | |
558 | fl->fl_start = 0; | |
559 | fl->fl_end = OFFSET_MAX; | |
560 | ||
561 | if (fl->fl_type == F_UNLCK) | |
562 | return do_unlk(filp, cmd, fl); | |
563 | return do_setlk(filp, cmd, fl); | |
564 | } | |
370f6599 BF |
565 | |
566 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) | |
567 | { | |
568 | /* | |
569 | * There is no protocol support for leases, so we have no way | |
570 | * to implement them correctly in the face of opens by other | |
571 | * clients. | |
572 | */ | |
573 | return -EINVAL; | |
574 | } |