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 | ||
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> | |
30 | ||
31 | #include <asm/uaccess.h> | |
32 | #include <asm/system.h> | |
33 | ||
34 | #include "delegation.h" | |
91d5b470 | 35 | #include "iostat.h" |
1da177e4 LT |
36 | |
37 | #define NFSDBG_FACILITY NFSDBG_FILE | |
38 | ||
39 | static int nfs_file_open(struct inode *, struct file *); | |
40 | static int nfs_file_release(struct inode *, struct file *); | |
980802e3 | 41 | static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin); |
1da177e4 LT |
42 | static int nfs_file_mmap(struct file *, struct vm_area_struct *); |
43 | static ssize_t nfs_file_sendfile(struct file *, loff_t *, size_t, read_actor_t, void *); | |
44 | static ssize_t nfs_file_read(struct kiocb *, char __user *, size_t, loff_t); | |
45 | static ssize_t nfs_file_write(struct kiocb *, const char __user *, size_t, loff_t); | |
75e1fcc0 | 46 | static int nfs_file_flush(struct file *, fl_owner_t id); |
1da177e4 LT |
47 | static int nfs_fsync(struct file *, struct dentry *dentry, int datasync); |
48 | static int nfs_check_flags(int flags); | |
49 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); | |
50 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); | |
51 | ||
4b6f5d20 | 52 | const struct file_operations nfs_file_operations = { |
980802e3 | 53 | .llseek = nfs_file_llseek, |
1da177e4 LT |
54 | .read = do_sync_read, |
55 | .write = do_sync_write, | |
56 | .aio_read = nfs_file_read, | |
57 | .aio_write = nfs_file_write, | |
58 | .mmap = nfs_file_mmap, | |
59 | .open = nfs_file_open, | |
60 | .flush = nfs_file_flush, | |
61 | .release = nfs_file_release, | |
62 | .fsync = nfs_fsync, | |
63 | .lock = nfs_lock, | |
64 | .flock = nfs_flock, | |
65 | .sendfile = nfs_file_sendfile, | |
66 | .check_flags = nfs_check_flags, | |
67 | }; | |
68 | ||
69 | struct inode_operations nfs_file_inode_operations = { | |
70 | .permission = nfs_permission, | |
71 | .getattr = nfs_getattr, | |
72 | .setattr = nfs_setattr, | |
73 | }; | |
74 | ||
b7fa0554 AG |
75 | #ifdef CONFIG_NFS_V3 |
76 | struct inode_operations nfs3_file_inode_operations = { | |
77 | .permission = nfs_permission, | |
78 | .getattr = nfs_getattr, | |
79 | .setattr = nfs_setattr, | |
80 | .listxattr = nfs3_listxattr, | |
81 | .getxattr = nfs3_getxattr, | |
82 | .setxattr = nfs3_setxattr, | |
83 | .removexattr = nfs3_removexattr, | |
84 | }; | |
85 | #endif /* CONFIG_NFS_v3 */ | |
86 | ||
1da177e4 LT |
87 | /* Hack for future NFS swap support */ |
88 | #ifndef IS_SWAPFILE | |
89 | # define IS_SWAPFILE(inode) (0) | |
90 | #endif | |
91 | ||
92 | static int nfs_check_flags(int flags) | |
93 | { | |
94 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
95 | return -EINVAL; | |
96 | ||
97 | return 0; | |
98 | } | |
99 | ||
100 | /* | |
101 | * Open file | |
102 | */ | |
103 | static int | |
104 | nfs_file_open(struct inode *inode, struct file *filp) | |
105 | { | |
1da177e4 LT |
106 | int res; |
107 | ||
108 | res = nfs_check_flags(filp->f_flags); | |
109 | if (res) | |
110 | return res; | |
111 | ||
91d5b470 | 112 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
1da177e4 | 113 | lock_kernel(); |
91d5b470 | 114 | res = NFS_SERVER(inode)->rpc_ops->file_open(inode, filp); |
1da177e4 LT |
115 | unlock_kernel(); |
116 | return res; | |
117 | } | |
118 | ||
119 | static int | |
120 | nfs_file_release(struct inode *inode, struct file *filp) | |
121 | { | |
122 | /* Ensure that dirty pages are flushed out with the right creds */ | |
123 | if (filp->f_mode & FMODE_WRITE) | |
124 | filemap_fdatawrite(filp->f_mapping); | |
91d5b470 | 125 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
1da177e4 LT |
126 | return NFS_PROTO(inode)->file_release(inode, filp); |
127 | } | |
128 | ||
fe51beec TM |
129 | /** |
130 | * nfs_revalidate_file - Revalidate the page cache & related metadata | |
131 | * @inode - pointer to inode struct | |
132 | * @file - pointer to file | |
133 | */ | |
134 | static int nfs_revalidate_file(struct inode *inode, struct file *filp) | |
135 | { | |
55296809 | 136 | struct nfs_inode *nfsi = NFS_I(inode); |
fe51beec TM |
137 | int retval = 0; |
138 | ||
b3c52da3 TM |
139 | if ((nfsi->cache_validity & (NFS_INO_REVAL_PAGECACHE|NFS_INO_INVALID_ATTR)) |
140 | || nfs_attribute_timeout(inode)) | |
fe51beec TM |
141 | retval = __nfs_revalidate_inode(NFS_SERVER(inode), inode); |
142 | nfs_revalidate_mapping(inode, filp->f_mapping); | |
143 | return 0; | |
144 | } | |
145 | ||
980802e3 TM |
146 | /** |
147 | * nfs_revalidate_size - Revalidate the file size | |
148 | * @inode - pointer to inode struct | |
149 | * @file - pointer to struct file | |
150 | * | |
151 | * Revalidates the file length. This is basically a wrapper around | |
152 | * nfs_revalidate_inode() that takes into account the fact that we may | |
153 | * have cached writes (in which case we don't care about the server's | |
154 | * idea of what the file length is), or O_DIRECT (in which case we | |
155 | * shouldn't trust the cache). | |
156 | */ | |
157 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
158 | { | |
159 | struct nfs_server *server = NFS_SERVER(inode); | |
160 | struct nfs_inode *nfsi = NFS_I(inode); | |
161 | ||
162 | if (server->flags & NFS_MOUNT_NOAC) | |
163 | goto force_reval; | |
164 | if (filp->f_flags & O_DIRECT) | |
165 | goto force_reval; | |
166 | if (nfsi->npages != 0) | |
167 | return 0; | |
55296809 | 168 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
fe51beec | 169 | return 0; |
980802e3 TM |
170 | force_reval: |
171 | return __nfs_revalidate_inode(server, inode); | |
172 | } | |
173 | ||
174 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
175 | { | |
176 | /* origin == SEEK_END => we must revalidate the cached file length */ | |
177 | if (origin == 2) { | |
178 | struct inode *inode = filp->f_mapping->host; | |
179 | int retval = nfs_revalidate_file_size(inode, filp); | |
180 | if (retval < 0) | |
181 | return (loff_t)retval; | |
182 | } | |
183 | return remote_llseek(filp, offset, origin); | |
184 | } | |
185 | ||
1da177e4 LT |
186 | /* |
187 | * Flush all dirty pages, and check for write errors. | |
188 | * | |
189 | */ | |
190 | static int | |
75e1fcc0 | 191 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 LT |
192 | { |
193 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
194 | struct inode *inode = file->f_dentry->d_inode; | |
195 | int status; | |
196 | ||
197 | dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
198 | ||
199 | if ((file->f_mode & FMODE_WRITE) == 0) | |
200 | return 0; | |
91d5b470 | 201 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
1da177e4 LT |
202 | lock_kernel(); |
203 | /* Ensure that data+attribute caches are up to date after close() */ | |
204 | status = nfs_wb_all(inode); | |
205 | if (!status) { | |
206 | status = ctx->error; | |
207 | ctx->error = 0; | |
3338c143 TM |
208 | if (!status) |
209 | nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1da177e4 LT |
210 | } |
211 | unlock_kernel(); | |
212 | return status; | |
213 | } | |
214 | ||
215 | static ssize_t | |
216 | nfs_file_read(struct kiocb *iocb, char __user * buf, size_t count, loff_t pos) | |
217 | { | |
218 | struct dentry * dentry = iocb->ki_filp->f_dentry; | |
219 | struct inode * inode = dentry->d_inode; | |
220 | ssize_t result; | |
221 | ||
222 | #ifdef CONFIG_NFS_DIRECTIO | |
223 | if (iocb->ki_filp->f_flags & O_DIRECT) | |
224 | return nfs_file_direct_read(iocb, buf, count, pos); | |
225 | #endif | |
226 | ||
227 | dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n", | |
228 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
229 | (unsigned long) count, (unsigned long) pos); | |
230 | ||
fe51beec | 231 | result = nfs_revalidate_file(inode, iocb->ki_filp); |
91d5b470 | 232 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
1da177e4 LT |
233 | if (!result) |
234 | result = generic_file_aio_read(iocb, buf, count, pos); | |
235 | return result; | |
236 | } | |
237 | ||
238 | static ssize_t | |
239 | nfs_file_sendfile(struct file *filp, loff_t *ppos, size_t count, | |
240 | read_actor_t actor, void *target) | |
241 | { | |
242 | struct dentry *dentry = filp->f_dentry; | |
243 | struct inode *inode = dentry->d_inode; | |
244 | ssize_t res; | |
245 | ||
246 | dfprintk(VFS, "nfs: sendfile(%s/%s, %lu@%Lu)\n", | |
247 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
248 | (unsigned long) count, (unsigned long long) *ppos); | |
249 | ||
fe51beec | 250 | res = nfs_revalidate_file(inode, filp); |
1da177e4 LT |
251 | if (!res) |
252 | res = generic_file_sendfile(filp, ppos, count, actor, target); | |
253 | return res; | |
254 | } | |
255 | ||
256 | static int | |
257 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) | |
258 | { | |
259 | struct dentry *dentry = file->f_dentry; | |
260 | struct inode *inode = dentry->d_inode; | |
261 | int status; | |
262 | ||
263 | dfprintk(VFS, "nfs: mmap(%s/%s)\n", | |
264 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
265 | ||
fe51beec | 266 | status = nfs_revalidate_file(inode, file); |
1da177e4 LT |
267 | if (!status) |
268 | status = generic_file_mmap(file, vma); | |
269 | return status; | |
270 | } | |
271 | ||
272 | /* | |
273 | * Flush any dirty pages for this process, and check for write errors. | |
274 | * The return status from this call provides a reliable indication of | |
275 | * whether any write errors occurred for this process. | |
276 | */ | |
277 | static int | |
278 | nfs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
279 | { | |
280 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
281 | struct inode *inode = dentry->d_inode; | |
282 | int status; | |
283 | ||
284 | dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
285 | ||
91d5b470 | 286 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
287 | lock_kernel(); |
288 | status = nfs_wb_all(inode); | |
289 | if (!status) { | |
290 | status = ctx->error; | |
291 | ctx->error = 0; | |
292 | } | |
293 | unlock_kernel(); | |
294 | return status; | |
295 | } | |
296 | ||
297 | /* | |
298 | * This does the "real" work of the write. The generic routine has | |
299 | * allocated the page, locked it, done all the page alignment stuff | |
300 | * calculations etc. Now we should just copy the data from user | |
301 | * space and write it back to the real medium.. | |
302 | * | |
303 | * If the writer ends up delaying the write, the writer needs to | |
304 | * increment the page use counts until he is done with the page. | |
305 | */ | |
306 | static int nfs_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to) | |
307 | { | |
308 | return nfs_flush_incompatible(file, page); | |
309 | } | |
310 | ||
311 | static int nfs_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to) | |
312 | { | |
313 | long status; | |
314 | ||
315 | lock_kernel(); | |
316 | status = nfs_updatepage(file, page, offset, to-offset); | |
317 | unlock_kernel(); | |
318 | return status; | |
319 | } | |
320 | ||
2ff28e22 | 321 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 TM |
322 | { |
323 | /* FIXME: we really should cancel any unstarted writes on this page */ | |
cd52ed35 TM |
324 | } |
325 | ||
326 | static int nfs_release_page(struct page *page, gfp_t gfp) | |
327 | { | |
328 | return !nfs_wb_page(page->mapping->host, page); | |
329 | } | |
330 | ||
1da177e4 LT |
331 | struct address_space_operations nfs_file_aops = { |
332 | .readpage = nfs_readpage, | |
333 | .readpages = nfs_readpages, | |
334 | .set_page_dirty = __set_page_dirty_nobuffers, | |
335 | .writepage = nfs_writepage, | |
336 | .writepages = nfs_writepages, | |
337 | .prepare_write = nfs_prepare_write, | |
338 | .commit_write = nfs_commit_write, | |
cd52ed35 TM |
339 | .invalidatepage = nfs_invalidate_page, |
340 | .releasepage = nfs_release_page, | |
1da177e4 LT |
341 | #ifdef CONFIG_NFS_DIRECTIO |
342 | .direct_IO = nfs_direct_IO, | |
343 | #endif | |
344 | }; | |
345 | ||
346 | /* | |
347 | * Write to a file (through the page cache). | |
348 | */ | |
349 | static ssize_t | |
350 | nfs_file_write(struct kiocb *iocb, const char __user *buf, size_t count, loff_t pos) | |
351 | { | |
352 | struct dentry * dentry = iocb->ki_filp->f_dentry; | |
353 | struct inode * inode = dentry->d_inode; | |
354 | ssize_t result; | |
355 | ||
356 | #ifdef CONFIG_NFS_DIRECTIO | |
357 | if (iocb->ki_filp->f_flags & O_DIRECT) | |
358 | return nfs_file_direct_write(iocb, buf, count, pos); | |
359 | #endif | |
360 | ||
361 | dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%lu)\n", | |
362 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
363 | inode->i_ino, (unsigned long) count, (unsigned long) pos); | |
364 | ||
365 | result = -EBUSY; | |
366 | if (IS_SWAPFILE(inode)) | |
367 | goto out_swapfile; | |
7d52e862 TM |
368 | /* |
369 | * O_APPEND implies that we must revalidate the file length. | |
370 | */ | |
371 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
372 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
373 | if (result) | |
374 | goto out; | |
fe51beec TM |
375 | } |
376 | nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); | |
1da177e4 LT |
377 | |
378 | result = count; | |
379 | if (!count) | |
380 | goto out; | |
381 | ||
91d5b470 | 382 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
1da177e4 LT |
383 | result = generic_file_aio_write(iocb, buf, count, pos); |
384 | out: | |
385 | return result; | |
386 | ||
387 | out_swapfile: | |
388 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
389 | goto out; | |
390 | } | |
391 | ||
392 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) | |
393 | { | |
8dc7c311 | 394 | struct file_lock cfl; |
1da177e4 LT |
395 | struct inode *inode = filp->f_mapping->host; |
396 | int status = 0; | |
397 | ||
398 | lock_kernel(); | |
039c4d7a | 399 | /* Try local locking first */ |
8dc7c311 | 400 | if (posix_test_lock(filp, fl, &cfl)) { |
e4cd038a TM |
401 | fl->fl_start = cfl.fl_start; |
402 | fl->fl_end = cfl.fl_end; | |
403 | fl->fl_type = cfl.fl_type; | |
404 | fl->fl_pid = cfl.fl_pid; | |
039c4d7a | 405 | goto out; |
1da177e4 | 406 | } |
039c4d7a TM |
407 | |
408 | if (nfs_have_delegation(inode, FMODE_READ)) | |
409 | goto out_noconflict; | |
410 | ||
411 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) | |
412 | goto out_noconflict; | |
413 | ||
414 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
415 | out: | |
1da177e4 LT |
416 | unlock_kernel(); |
417 | return status; | |
039c4d7a TM |
418 | out_noconflict: |
419 | fl->fl_type = F_UNLCK; | |
420 | goto out; | |
1da177e4 LT |
421 | } |
422 | ||
423 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
424 | { | |
425 | int res = 0; | |
426 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
427 | case FL_POSIX: | |
428 | res = posix_lock_file_wait(file, fl); | |
429 | break; | |
430 | case FL_FLOCK: | |
431 | res = flock_lock_file_wait(file, fl); | |
432 | break; | |
433 | default: | |
434 | BUG(); | |
435 | } | |
436 | if (res < 0) | |
437 | printk(KERN_WARNING "%s: VFS is out of sync with lock manager!\n", | |
438 | __FUNCTION__); | |
439 | return res; | |
440 | } | |
441 | ||
442 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) | |
443 | { | |
444 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
445 | int status; |
446 | ||
1da177e4 LT |
447 | /* |
448 | * Flush all pending writes before doing anything | |
449 | * with locks.. | |
450 | */ | |
29884df0 | 451 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
452 | |
453 | /* NOTE: special case | |
454 | * If we're signalled while cleaning up locks on process exit, we | |
455 | * still need to complete the unlock. | |
456 | */ | |
457 | lock_kernel(); | |
458 | /* Use local locking if mounted with "-onolock" */ | |
459 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) | |
460 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
461 | else | |
462 | status = do_vfs_lock(filp, fl); | |
463 | unlock_kernel(); | |
1da177e4 LT |
464 | return status; |
465 | } | |
466 | ||
467 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) | |
468 | { | |
469 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
470 | int status; |
471 | ||
1da177e4 LT |
472 | /* |
473 | * Flush all pending writes before doing anything | |
474 | * with locks.. | |
475 | */ | |
29884df0 TM |
476 | status = nfs_sync_mapping(filp->f_mapping); |
477 | if (status != 0) | |
1da177e4 LT |
478 | goto out; |
479 | ||
480 | lock_kernel(); | |
481 | /* Use local locking if mounted with "-onolock" */ | |
482 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) { | |
483 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
484 | /* If we were signalled we still need to ensure that | |
485 | * we clean up any state on the server. We therefore | |
486 | * record the lock call as having succeeded in order to | |
487 | * ensure that locks_remove_posix() cleans it out when | |
488 | * the process exits. | |
489 | */ | |
490 | if (status == -EINTR || status == -ERESTARTSYS) | |
491 | do_vfs_lock(filp, fl); | |
492 | } else | |
493 | status = do_vfs_lock(filp, fl); | |
494 | unlock_kernel(); | |
495 | if (status < 0) | |
496 | goto out; | |
497 | /* | |
498 | * Make sure we clear the cache whenever we try to get the lock. | |
499 | * This makes locking act as a cache coherency point. | |
500 | */ | |
29884df0 | 501 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
502 | nfs_zap_caches(inode); |
503 | out: | |
1da177e4 LT |
504 | return status; |
505 | } | |
506 | ||
507 | /* | |
508 | * Lock a (portion of) a file | |
509 | */ | |
510 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
511 | { | |
512 | struct inode * inode = filp->f_mapping->host; | |
513 | ||
514 | dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n", | |
515 | inode->i_sb->s_id, inode->i_ino, | |
516 | fl->fl_type, fl->fl_flags, | |
517 | (long long)fl->fl_start, (long long)fl->fl_end); | |
91d5b470 | 518 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
519 | |
520 | /* No mandatory locks over NFS */ | |
0800c5f7 AM |
521 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID && |
522 | fl->fl_type != F_UNLCK) | |
1da177e4 LT |
523 | return -ENOLCK; |
524 | ||
525 | if (IS_GETLK(cmd)) | |
526 | return do_getlk(filp, cmd, fl); | |
527 | if (fl->fl_type == F_UNLCK) | |
528 | return do_unlk(filp, cmd, fl); | |
529 | return do_setlk(filp, cmd, fl); | |
530 | } | |
531 | ||
532 | /* | |
533 | * Lock a (portion of) a file | |
534 | */ | |
535 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
536 | { | |
1da177e4 | 537 | dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n", |
e99170ff TM |
538 | filp->f_dentry->d_inode->i_sb->s_id, |
539 | filp->f_dentry->d_inode->i_ino, | |
1da177e4 LT |
540 | fl->fl_type, fl->fl_flags); |
541 | ||
1da177e4 LT |
542 | /* |
543 | * No BSD flocks over NFS allowed. | |
544 | * Note: we could try to fake a POSIX lock request here by | |
545 | * using ((u32) filp | 0x80000000) or some such as the pid. | |
546 | * Not sure whether that would be unique, though, or whether | |
547 | * that would break in other places. | |
548 | */ | |
549 | if (!(fl->fl_flags & FL_FLOCK)) | |
550 | return -ENOLCK; | |
551 | ||
552 | /* We're simulating flock() locks using posix locks on the server */ | |
553 | fl->fl_owner = (fl_owner_t)filp; | |
554 | fl->fl_start = 0; | |
555 | fl->fl_end = OFFSET_MAX; | |
556 | ||
557 | if (fl->fl_type == F_UNLCK) | |
558 | return do_unlk(filp, cmd, fl); | |
559 | return do_setlk(filp, cmd, fl); | |
560 | } |