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 *); | |
027445c3 BP |
44 | static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov, |
45 | unsigned long nr_segs, loff_t pos); | |
46 | static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, | |
47 | unsigned long nr_segs, loff_t pos); | |
75e1fcc0 | 48 | static int nfs_file_flush(struct file *, fl_owner_t id); |
1da177e4 LT |
49 | static int nfs_fsync(struct file *, struct dentry *dentry, int datasync); |
50 | static int nfs_check_flags(int flags); | |
51 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); | |
52 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); | |
53 | ||
4b6f5d20 | 54 | const struct file_operations nfs_file_operations = { |
980802e3 | 55 | .llseek = nfs_file_llseek, |
1da177e4 LT |
56 | .read = do_sync_read, |
57 | .write = do_sync_write, | |
027445c3 BP |
58 | .aio_read = nfs_file_read, |
59 | .aio_write = nfs_file_write, | |
1da177e4 LT |
60 | .mmap = nfs_file_mmap, |
61 | .open = nfs_file_open, | |
62 | .flush = nfs_file_flush, | |
63 | .release = nfs_file_release, | |
64 | .fsync = nfs_fsync, | |
65 | .lock = nfs_lock, | |
66 | .flock = nfs_flock, | |
67 | .sendfile = nfs_file_sendfile, | |
68 | .check_flags = nfs_check_flags, | |
69 | }; | |
70 | ||
92e1d5be | 71 | const struct inode_operations nfs_file_inode_operations = { |
1da177e4 LT |
72 | .permission = nfs_permission, |
73 | .getattr = nfs_getattr, | |
74 | .setattr = nfs_setattr, | |
75 | }; | |
76 | ||
b7fa0554 | 77 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 78 | const struct inode_operations nfs3_file_inode_operations = { |
b7fa0554 AG |
79 | .permission = nfs_permission, |
80 | .getattr = nfs_getattr, | |
81 | .setattr = nfs_setattr, | |
82 | .listxattr = nfs3_listxattr, | |
83 | .getxattr = nfs3_getxattr, | |
84 | .setxattr = nfs3_setxattr, | |
85 | .removexattr = nfs3_removexattr, | |
86 | }; | |
87 | #endif /* CONFIG_NFS_v3 */ | |
88 | ||
1da177e4 LT |
89 | /* Hack for future NFS swap support */ |
90 | #ifndef IS_SWAPFILE | |
91 | # define IS_SWAPFILE(inode) (0) | |
92 | #endif | |
93 | ||
94 | static int nfs_check_flags(int flags) | |
95 | { | |
96 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
97 | return -EINVAL; | |
98 | ||
99 | return 0; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Open file | |
104 | */ | |
105 | static int | |
106 | nfs_file_open(struct inode *inode, struct file *filp) | |
107 | { | |
1da177e4 LT |
108 | int res; |
109 | ||
110 | res = nfs_check_flags(filp->f_flags); | |
111 | if (res) | |
112 | return res; | |
113 | ||
91d5b470 | 114 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
1da177e4 | 115 | lock_kernel(); |
1f163415 | 116 | res = NFS_PROTO(inode)->file_open(inode, filp); |
1da177e4 LT |
117 | unlock_kernel(); |
118 | return res; | |
119 | } | |
120 | ||
121 | static int | |
122 | nfs_file_release(struct inode *inode, struct file *filp) | |
123 | { | |
124 | /* Ensure that dirty pages are flushed out with the right creds */ | |
125 | if (filp->f_mode & FMODE_WRITE) | |
126 | filemap_fdatawrite(filp->f_mapping); | |
91d5b470 | 127 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
1da177e4 LT |
128 | return NFS_PROTO(inode)->file_release(inode, filp); |
129 | } | |
130 | ||
980802e3 TM |
131 | /** |
132 | * nfs_revalidate_size - Revalidate the file size | |
133 | * @inode - pointer to inode struct | |
134 | * @file - pointer to struct file | |
135 | * | |
136 | * Revalidates the file length. This is basically a wrapper around | |
137 | * nfs_revalidate_inode() that takes into account the fact that we may | |
138 | * have cached writes (in which case we don't care about the server's | |
139 | * idea of what the file length is), or O_DIRECT (in which case we | |
140 | * shouldn't trust the cache). | |
141 | */ | |
142 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
143 | { | |
144 | struct nfs_server *server = NFS_SERVER(inode); | |
145 | struct nfs_inode *nfsi = NFS_I(inode); | |
146 | ||
147 | if (server->flags & NFS_MOUNT_NOAC) | |
148 | goto force_reval; | |
149 | if (filp->f_flags & O_DIRECT) | |
150 | goto force_reval; | |
151 | if (nfsi->npages != 0) | |
152 | return 0; | |
55296809 | 153 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
fe51beec | 154 | return 0; |
980802e3 TM |
155 | force_reval: |
156 | return __nfs_revalidate_inode(server, inode); | |
157 | } | |
158 | ||
159 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
160 | { | |
161 | /* origin == SEEK_END => we must revalidate the cached file length */ | |
aec5e175 | 162 | if (origin == SEEK_END) { |
980802e3 TM |
163 | struct inode *inode = filp->f_mapping->host; |
164 | int retval = nfs_revalidate_file_size(inode, filp); | |
165 | if (retval < 0) | |
166 | return (loff_t)retval; | |
167 | } | |
168 | return remote_llseek(filp, offset, origin); | |
169 | } | |
170 | ||
1da177e4 LT |
171 | /* |
172 | * Flush all dirty pages, and check for write errors. | |
173 | * | |
174 | */ | |
175 | static int | |
75e1fcc0 | 176 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 LT |
177 | { |
178 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
01cce933 | 179 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
180 | int status; |
181 | ||
182 | dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
183 | ||
184 | if ((file->f_mode & FMODE_WRITE) == 0) | |
185 | return 0; | |
91d5b470 | 186 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
1da177e4 LT |
187 | lock_kernel(); |
188 | /* Ensure that data+attribute caches are up to date after close() */ | |
189 | status = nfs_wb_all(inode); | |
190 | if (!status) { | |
191 | status = ctx->error; | |
192 | ctx->error = 0; | |
3338c143 TM |
193 | if (!status) |
194 | nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1da177e4 LT |
195 | } |
196 | unlock_kernel(); | |
197 | return status; | |
198 | } | |
199 | ||
200 | static ssize_t | |
027445c3 BP |
201 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
202 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 203 | { |
01cce933 | 204 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
205 | struct inode * inode = dentry->d_inode; |
206 | ssize_t result; | |
027445c3 | 207 | size_t count = iov_length(iov, nr_segs); |
1da177e4 LT |
208 | |
209 | #ifdef CONFIG_NFS_DIRECTIO | |
210 | if (iocb->ki_filp->f_flags & O_DIRECT) | |
027445c3 | 211 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
212 | #endif |
213 | ||
214 | dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n", | |
215 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
216 | (unsigned long) count, (unsigned long) pos); | |
217 | ||
44b11874 | 218 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
91d5b470 | 219 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
1da177e4 | 220 | if (!result) |
027445c3 | 221 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
222 | return result; |
223 | } | |
224 | ||
225 | static ssize_t | |
226 | nfs_file_sendfile(struct file *filp, loff_t *ppos, size_t count, | |
227 | read_actor_t actor, void *target) | |
228 | { | |
01cce933 | 229 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
230 | struct inode *inode = dentry->d_inode; |
231 | ssize_t res; | |
232 | ||
233 | dfprintk(VFS, "nfs: sendfile(%s/%s, %lu@%Lu)\n", | |
234 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
235 | (unsigned long) count, (unsigned long long) *ppos); | |
236 | ||
44b11874 | 237 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
1da177e4 LT |
238 | if (!res) |
239 | res = generic_file_sendfile(filp, ppos, count, actor, target); | |
240 | return res; | |
241 | } | |
242 | ||
243 | static int | |
244 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) | |
245 | { | |
01cce933 | 246 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
247 | struct inode *inode = dentry->d_inode; |
248 | int status; | |
249 | ||
250 | dfprintk(VFS, "nfs: mmap(%s/%s)\n", | |
251 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
252 | ||
44b11874 | 253 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
1da177e4 LT |
254 | if (!status) |
255 | status = generic_file_mmap(file, vma); | |
256 | return status; | |
257 | } | |
258 | ||
259 | /* | |
260 | * Flush any dirty pages for this process, and check for write errors. | |
261 | * The return status from this call provides a reliable indication of | |
262 | * whether any write errors occurred for this process. | |
263 | */ | |
264 | static int | |
265 | nfs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
266 | { | |
267 | struct nfs_open_context *ctx = (struct nfs_open_context *)file->private_data; | |
268 | struct inode *inode = dentry->d_inode; | |
269 | int status; | |
270 | ||
271 | dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
272 | ||
91d5b470 | 273 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
1da177e4 LT |
274 | lock_kernel(); |
275 | status = nfs_wb_all(inode); | |
276 | if (!status) { | |
277 | status = ctx->error; | |
278 | ctx->error = 0; | |
279 | } | |
280 | unlock_kernel(); | |
281 | return status; | |
282 | } | |
283 | ||
284 | /* | |
285 | * This does the "real" work of the write. The generic routine has | |
286 | * allocated the page, locked it, done all the page alignment stuff | |
287 | * calculations etc. Now we should just copy the data from user | |
288 | * space and write it back to the real medium.. | |
289 | * | |
290 | * If the writer ends up delaying the write, the writer needs to | |
291 | * increment the page use counts until he is done with the page. | |
292 | */ | |
293 | static int nfs_prepare_write(struct file *file, struct page *page, unsigned offset, unsigned to) | |
294 | { | |
295 | return nfs_flush_incompatible(file, page); | |
296 | } | |
297 | ||
298 | static int nfs_commit_write(struct file *file, struct page *page, unsigned offset, unsigned to) | |
299 | { | |
300 | long status; | |
301 | ||
302 | lock_kernel(); | |
303 | status = nfs_updatepage(file, page, offset, to-offset); | |
304 | unlock_kernel(); | |
305 | return status; | |
306 | } | |
307 | ||
2ff28e22 | 308 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 | 309 | { |
1c75950b TM |
310 | if (offset != 0) |
311 | return; | |
d2ccddf0 | 312 | /* Cancel any unstarted writes on this page */ |
61822ab5 | 313 | nfs_wb_page_priority(page->mapping->host, page, FLUSH_INVALIDATE); |
cd52ed35 TM |
314 | } |
315 | ||
316 | static int nfs_release_page(struct page *page, gfp_t gfp) | |
317 | { | |
e3db7691 TM |
318 | /* If PagePrivate() is set, then the page is not freeable */ |
319 | return 0; | |
320 | } | |
321 | ||
322 | static int nfs_launder_page(struct page *page) | |
323 | { | |
324 | return nfs_wb_page(page->mapping->host, page); | |
cd52ed35 TM |
325 | } |
326 | ||
f5e54d6e | 327 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
328 | .readpage = nfs_readpage, |
329 | .readpages = nfs_readpages, | |
1a54533e | 330 | .set_page_dirty = nfs_set_page_dirty, |
1da177e4 LT |
331 | .writepage = nfs_writepage, |
332 | .writepages = nfs_writepages, | |
333 | .prepare_write = nfs_prepare_write, | |
334 | .commit_write = nfs_commit_write, | |
cd52ed35 TM |
335 | .invalidatepage = nfs_invalidate_page, |
336 | .releasepage = nfs_release_page, | |
1da177e4 LT |
337 | #ifdef CONFIG_NFS_DIRECTIO |
338 | .direct_IO = nfs_direct_IO, | |
339 | #endif | |
e3db7691 | 340 | .launder_page = nfs_launder_page, |
1da177e4 LT |
341 | }; |
342 | ||
027445c3 BP |
343 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
344 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 345 | { |
01cce933 | 346 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
347 | struct inode * inode = dentry->d_inode; |
348 | ssize_t result; | |
027445c3 | 349 | size_t count = iov_length(iov, nr_segs); |
1da177e4 LT |
350 | |
351 | #ifdef CONFIG_NFS_DIRECTIO | |
352 | if (iocb->ki_filp->f_flags & O_DIRECT) | |
027445c3 | 353 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
1da177e4 LT |
354 | #endif |
355 | ||
027445c3 | 356 | dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%Ld)\n", |
1da177e4 | 357 | dentry->d_parent->d_name.name, dentry->d_name.name, |
027445c3 | 358 | inode->i_ino, (unsigned long) count, (long long) pos); |
1da177e4 LT |
359 | |
360 | result = -EBUSY; | |
361 | if (IS_SWAPFILE(inode)) | |
362 | goto out_swapfile; | |
7d52e862 TM |
363 | /* |
364 | * O_APPEND implies that we must revalidate the file length. | |
365 | */ | |
366 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
367 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
368 | if (result) | |
369 | goto out; | |
fe51beec | 370 | } |
1da177e4 LT |
371 | |
372 | result = count; | |
373 | if (!count) | |
374 | goto out; | |
375 | ||
91d5b470 | 376 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
027445c3 | 377 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
200baa21 TM |
378 | /* Return error values for O_SYNC and IS_SYNC() */ |
379 | if (result >= 0 && (IS_SYNC(inode) || (iocb->ki_filp->f_flags & O_SYNC))) { | |
380 | int err = nfs_fsync(iocb->ki_filp, dentry, 1); | |
381 | if (err < 0) | |
382 | result = err; | |
383 | } | |
1da177e4 LT |
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 | { | |
394 | struct inode *inode = filp->f_mapping->host; | |
395 | int status = 0; | |
396 | ||
397 | lock_kernel(); | |
039c4d7a | 398 | /* Try local locking first */ |
9d6a8c5c | 399 | if (posix_test_lock(filp, fl)) { |
039c4d7a | 400 | goto out; |
1da177e4 | 401 | } |
039c4d7a TM |
402 | |
403 | if (nfs_have_delegation(inode, FMODE_READ)) | |
404 | goto out_noconflict; | |
405 | ||
406 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) | |
407 | goto out_noconflict; | |
408 | ||
409 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
410 | out: | |
1da177e4 LT |
411 | unlock_kernel(); |
412 | return status; | |
039c4d7a TM |
413 | out_noconflict: |
414 | fl->fl_type = F_UNLCK; | |
415 | goto out; | |
1da177e4 LT |
416 | } |
417 | ||
418 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
419 | { | |
420 | int res = 0; | |
421 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
422 | case FL_POSIX: | |
423 | res = posix_lock_file_wait(file, fl); | |
424 | break; | |
425 | case FL_FLOCK: | |
426 | res = flock_lock_file_wait(file, fl); | |
427 | break; | |
428 | default: | |
429 | BUG(); | |
430 | } | |
431 | if (res < 0) | |
46bae1a9 NB |
432 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
433 | " - error %d!\n", | |
434 | __FUNCTION__, res); | |
1da177e4 LT |
435 | return res; |
436 | } | |
437 | ||
438 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) | |
439 | { | |
440 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
441 | int status; |
442 | ||
1da177e4 LT |
443 | /* |
444 | * Flush all pending writes before doing anything | |
445 | * with locks.. | |
446 | */ | |
29884df0 | 447 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
448 | |
449 | /* NOTE: special case | |
450 | * If we're signalled while cleaning up locks on process exit, we | |
451 | * still need to complete the unlock. | |
452 | */ | |
453 | lock_kernel(); | |
454 | /* Use local locking if mounted with "-onolock" */ | |
455 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) | |
456 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
457 | else | |
458 | status = do_vfs_lock(filp, fl); | |
459 | unlock_kernel(); | |
1da177e4 LT |
460 | return status; |
461 | } | |
462 | ||
463 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) | |
464 | { | |
465 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
466 | int status; |
467 | ||
1da177e4 LT |
468 | /* |
469 | * Flush all pending writes before doing anything | |
470 | * with locks.. | |
471 | */ | |
29884df0 TM |
472 | status = nfs_sync_mapping(filp->f_mapping); |
473 | if (status != 0) | |
1da177e4 LT |
474 | goto out; |
475 | ||
476 | lock_kernel(); | |
477 | /* Use local locking if mounted with "-onolock" */ | |
478 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) { | |
479 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
480 | /* If we were signalled we still need to ensure that | |
481 | * we clean up any state on the server. We therefore | |
482 | * record the lock call as having succeeded in order to | |
483 | * ensure that locks_remove_posix() cleans it out when | |
484 | * the process exits. | |
485 | */ | |
486 | if (status == -EINTR || status == -ERESTARTSYS) | |
487 | do_vfs_lock(filp, fl); | |
488 | } else | |
489 | status = do_vfs_lock(filp, fl); | |
490 | unlock_kernel(); | |
491 | if (status < 0) | |
492 | goto out; | |
493 | /* | |
494 | * Make sure we clear the cache whenever we try to get the lock. | |
495 | * This makes locking act as a cache coherency point. | |
496 | */ | |
29884df0 | 497 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
498 | nfs_zap_caches(inode); |
499 | out: | |
1da177e4 LT |
500 | return status; |
501 | } | |
502 | ||
503 | /* | |
504 | * Lock a (portion of) a file | |
505 | */ | |
506 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
507 | { | |
508 | struct inode * inode = filp->f_mapping->host; | |
509 | ||
510 | dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n", | |
511 | inode->i_sb->s_id, inode->i_ino, | |
512 | fl->fl_type, fl->fl_flags, | |
513 | (long long)fl->fl_start, (long long)fl->fl_end); | |
91d5b470 | 514 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
515 | |
516 | /* No mandatory locks over NFS */ | |
0800c5f7 AM |
517 | if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID && |
518 | fl->fl_type != F_UNLCK) | |
1da177e4 LT |
519 | return -ENOLCK; |
520 | ||
521 | if (IS_GETLK(cmd)) | |
522 | return do_getlk(filp, cmd, fl); | |
523 | if (fl->fl_type == F_UNLCK) | |
524 | return do_unlk(filp, cmd, fl); | |
525 | return do_setlk(filp, cmd, fl); | |
526 | } | |
527 | ||
528 | /* | |
529 | * Lock a (portion of) a file | |
530 | */ | |
531 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
532 | { | |
1da177e4 | 533 | dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n", |
01cce933 JJS |
534 | filp->f_path.dentry->d_inode->i_sb->s_id, |
535 | filp->f_path.dentry->d_inode->i_ino, | |
1da177e4 LT |
536 | fl->fl_type, fl->fl_flags); |
537 | ||
1da177e4 LT |
538 | /* |
539 | * No BSD flocks over NFS allowed. | |
540 | * Note: we could try to fake a POSIX lock request here by | |
541 | * using ((u32) filp | 0x80000000) or some such as the pid. | |
542 | * Not sure whether that would be unique, though, or whether | |
543 | * that would break in other places. | |
544 | */ | |
545 | if (!(fl->fl_flags & FL_FLOCK)) | |
546 | return -ENOLCK; | |
547 | ||
548 | /* We're simulating flock() locks using posix locks on the server */ | |
549 | fl->fl_owner = (fl_owner_t)filp; | |
550 | fl->fl_start = 0; | |
551 | fl->fl_end = OFFSET_MAX; | |
552 | ||
553 | if (fl->fl_type == F_UNLCK) | |
554 | return do_unlk(filp, cmd, fl); | |
555 | return do_setlk(filp, cmd, fl); | |
556 | } |