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> | |
e8edc6e0 | 30 | #include <linux/aio.h> |
1da177e4 LT |
31 | |
32 | #include <asm/uaccess.h> | |
33 | #include <asm/system.h> | |
34 | ||
35 | #include "delegation.h" | |
94387fb1 | 36 | #include "internal.h" |
91d5b470 | 37 | #include "iostat.h" |
1da177e4 LT |
38 | |
39 | #define NFSDBG_FACILITY NFSDBG_FILE | |
40 | ||
41 | static int nfs_file_open(struct inode *, struct file *); | |
42 | static int nfs_file_release(struct inode *, struct file *); | |
980802e3 | 43 | static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin); |
1da177e4 | 44 | static int nfs_file_mmap(struct file *, struct vm_area_struct *); |
f0930fff JA |
45 | static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos, |
46 | struct pipe_inode_info *pipe, | |
47 | size_t count, unsigned int flags); | |
027445c3 BP |
48 | static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov, |
49 | unsigned long nr_segs, loff_t pos); | |
50 | static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, | |
51 | unsigned long nr_segs, loff_t pos); | |
75e1fcc0 | 52 | static int nfs_file_flush(struct file *, fl_owner_t id); |
1da177e4 LT |
53 | static int nfs_fsync(struct file *, struct dentry *dentry, int datasync); |
54 | static int nfs_check_flags(int flags); | |
55 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); | |
56 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); | |
370f6599 | 57 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl); |
1da177e4 | 58 | |
94387fb1 TM |
59 | static struct vm_operations_struct nfs_file_vm_ops; |
60 | ||
4b6f5d20 | 61 | const struct file_operations nfs_file_operations = { |
980802e3 | 62 | .llseek = nfs_file_llseek, |
1da177e4 LT |
63 | .read = do_sync_read, |
64 | .write = do_sync_write, | |
027445c3 BP |
65 | .aio_read = nfs_file_read, |
66 | .aio_write = nfs_file_write, | |
1da177e4 LT |
67 | .mmap = nfs_file_mmap, |
68 | .open = nfs_file_open, | |
69 | .flush = nfs_file_flush, | |
70 | .release = nfs_file_release, | |
71 | .fsync = nfs_fsync, | |
72 | .lock = nfs_lock, | |
73 | .flock = nfs_flock, | |
f0930fff | 74 | .splice_read = nfs_file_splice_read, |
1da177e4 | 75 | .check_flags = nfs_check_flags, |
370f6599 | 76 | .setlease = nfs_setlease, |
1da177e4 LT |
77 | }; |
78 | ||
92e1d5be | 79 | const struct inode_operations nfs_file_inode_operations = { |
1da177e4 LT |
80 | .permission = nfs_permission, |
81 | .getattr = nfs_getattr, | |
82 | .setattr = nfs_setattr, | |
83 | }; | |
84 | ||
b7fa0554 | 85 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 86 | const struct inode_operations nfs3_file_inode_operations = { |
b7fa0554 AG |
87 | .permission = nfs_permission, |
88 | .getattr = nfs_getattr, | |
89 | .setattr = nfs_setattr, | |
90 | .listxattr = nfs3_listxattr, | |
91 | .getxattr = nfs3_getxattr, | |
92 | .setxattr = nfs3_setxattr, | |
93 | .removexattr = nfs3_removexattr, | |
94 | }; | |
95 | #endif /* CONFIG_NFS_v3 */ | |
96 | ||
1da177e4 LT |
97 | /* Hack for future NFS swap support */ |
98 | #ifndef IS_SWAPFILE | |
99 | # define IS_SWAPFILE(inode) (0) | |
100 | #endif | |
101 | ||
102 | static int nfs_check_flags(int flags) | |
103 | { | |
104 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
105 | return -EINVAL; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Open file | |
112 | */ | |
113 | static int | |
114 | nfs_file_open(struct inode *inode, struct file *filp) | |
115 | { | |
1da177e4 LT |
116 | int res; |
117 | ||
118 | res = nfs_check_flags(filp->f_flags); | |
119 | if (res) | |
120 | return res; | |
121 | ||
91d5b470 | 122 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
1da177e4 | 123 | lock_kernel(); |
1f163415 | 124 | res = NFS_PROTO(inode)->file_open(inode, filp); |
1da177e4 LT |
125 | unlock_kernel(); |
126 | return res; | |
127 | } | |
128 | ||
129 | static int | |
130 | nfs_file_release(struct inode *inode, struct file *filp) | |
131 | { | |
132 | /* Ensure that dirty pages are flushed out with the right creds */ | |
133 | if (filp->f_mode & FMODE_WRITE) | |
a49c3c77 | 134 | nfs_wb_all(filp->f_path.dentry->d_inode); |
91d5b470 | 135 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
1da177e4 LT |
136 | return NFS_PROTO(inode)->file_release(inode, filp); |
137 | } | |
138 | ||
980802e3 TM |
139 | /** |
140 | * nfs_revalidate_size - Revalidate the file size | |
141 | * @inode - pointer to inode struct | |
142 | * @file - pointer to struct file | |
143 | * | |
144 | * Revalidates the file length. This is basically a wrapper around | |
145 | * nfs_revalidate_inode() that takes into account the fact that we may | |
146 | * have cached writes (in which case we don't care about the server's | |
147 | * idea of what the file length is), or O_DIRECT (in which case we | |
148 | * shouldn't trust the cache). | |
149 | */ | |
150 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
151 | { | |
152 | struct nfs_server *server = NFS_SERVER(inode); | |
153 | struct nfs_inode *nfsi = NFS_I(inode); | |
154 | ||
155 | if (server->flags & NFS_MOUNT_NOAC) | |
156 | goto force_reval; | |
157 | if (filp->f_flags & O_DIRECT) | |
158 | goto force_reval; | |
159 | if (nfsi->npages != 0) | |
160 | return 0; | |
55296809 | 161 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
fe51beec | 162 | return 0; |
980802e3 TM |
163 | force_reval: |
164 | return __nfs_revalidate_inode(server, inode); | |
165 | } | |
166 | ||
167 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
168 | { | |
169 | /* origin == SEEK_END => we must revalidate the cached file length */ | |
aec5e175 | 170 | if (origin == SEEK_END) { |
980802e3 TM |
171 | struct inode *inode = filp->f_mapping->host; |
172 | int retval = nfs_revalidate_file_size(inode, filp); | |
173 | if (retval < 0) | |
174 | return (loff_t)retval; | |
175 | } | |
176 | return remote_llseek(filp, offset, origin); | |
177 | } | |
178 | ||
7b159fc1 TM |
179 | /* |
180 | * Helper for nfs_file_flush() and nfs_fsync() | |
181 | * | |
182 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to | |
183 | * disk, but it retrieves and clears ctx->error after synching, despite | |
184 | * the two being set at the same time in nfs_context_set_write_error(). | |
185 | * This is because the former is used to notify the _next_ call to | |
186 | * nfs_file_write() that a write error occured, and hence cause it to | |
187 | * fall back to doing a synchronous write. | |
188 | */ | |
189 | static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) | |
190 | { | |
191 | int have_error, status; | |
192 | int ret = 0; | |
193 | ||
194 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
195 | status = nfs_wb_all(inode); | |
196 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
197 | if (have_error) | |
198 | ret = xchg(&ctx->error, 0); | |
199 | if (!ret) | |
200 | ret = status; | |
201 | return ret; | |
202 | } | |
203 | ||
1da177e4 LT |
204 | /* |
205 | * Flush all dirty pages, and check for write errors. | |
206 | * | |
207 | */ | |
208 | static int | |
75e1fcc0 | 209 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 | 210 | { |
cd3758e3 | 211 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
01cce933 | 212 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
213 | int status; |
214 | ||
215 | dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
216 | ||
217 | if ((file->f_mode & FMODE_WRITE) == 0) | |
218 | return 0; | |
91d5b470 | 219 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
7b159fc1 | 220 | |
1da177e4 | 221 | /* Ensure that data+attribute caches are up to date after close() */ |
7b159fc1 TM |
222 | status = nfs_do_fsync(ctx, inode); |
223 | if (!status) | |
224 | nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1da177e4 LT |
225 | return status; |
226 | } | |
227 | ||
228 | static ssize_t | |
027445c3 BP |
229 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
230 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 231 | { |
01cce933 | 232 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
233 | struct inode * inode = dentry->d_inode; |
234 | ssize_t result; | |
027445c3 | 235 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 236 | |
1da177e4 | 237 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 238 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
239 | |
240 | dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n", | |
241 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
242 | (unsigned long) count, (unsigned long) pos); | |
243 | ||
44b11874 | 244 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
91d5b470 | 245 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
1da177e4 | 246 | if (!result) |
027445c3 | 247 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
248 | return result; |
249 | } | |
250 | ||
251 | static ssize_t | |
f0930fff JA |
252 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
253 | struct pipe_inode_info *pipe, size_t count, | |
254 | unsigned int flags) | |
1da177e4 | 255 | { |
01cce933 | 256 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
257 | struct inode *inode = dentry->d_inode; |
258 | ssize_t res; | |
259 | ||
f0930fff | 260 | dfprintk(VFS, "nfs: splice_read(%s/%s, %lu@%Lu)\n", |
1da177e4 LT |
261 | dentry->d_parent->d_name.name, dentry->d_name.name, |
262 | (unsigned long) count, (unsigned long long) *ppos); | |
263 | ||
44b11874 | 264 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
1da177e4 | 265 | if (!res) |
f0930fff | 266 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
1da177e4 LT |
267 | return res; |
268 | } | |
269 | ||
270 | static int | |
271 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) | |
272 | { | |
01cce933 | 273 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
274 | struct inode *inode = dentry->d_inode; |
275 | int status; | |
276 | ||
277 | dfprintk(VFS, "nfs: mmap(%s/%s)\n", | |
278 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
279 | ||
44b11874 | 280 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
94387fb1 TM |
281 | if (!status) { |
282 | vma->vm_ops = &nfs_file_vm_ops; | |
283 | vma->vm_flags |= VM_CAN_NONLINEAR; | |
284 | file_accessed(file); | |
285 | } | |
1da177e4 LT |
286 | return status; |
287 | } | |
288 | ||
289 | /* | |
290 | * Flush any dirty pages for this process, and check for write errors. | |
291 | * The return status from this call provides a reliable indication of | |
292 | * whether any write errors occurred for this process. | |
293 | */ | |
294 | static int | |
295 | nfs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
296 | { | |
cd3758e3 | 297 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 298 | struct inode *inode = dentry->d_inode; |
1da177e4 LT |
299 | |
300 | dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
301 | ||
91d5b470 | 302 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
7b159fc1 | 303 | return nfs_do_fsync(ctx, inode); |
1da177e4 LT |
304 | } |
305 | ||
306 | /* | |
4899f9c8 NP |
307 | * This does the "real" work of the write. We must allocate and lock the |
308 | * page to be sent back to the generic routine, which then copies the | |
309 | * data from user space. | |
1da177e4 LT |
310 | * |
311 | * If the writer ends up delaying the write, the writer needs to | |
312 | * increment the page use counts until he is done with the page. | |
313 | */ | |
4899f9c8 NP |
314 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
315 | loff_t pos, unsigned len, unsigned flags, | |
316 | struct page **pagep, void **fsdata) | |
1da177e4 | 317 | { |
4899f9c8 NP |
318 | int ret; |
319 | pgoff_t index; | |
320 | struct page *page; | |
321 | index = pos >> PAGE_CACHE_SHIFT; | |
322 | ||
323 | page = __grab_cache_page(mapping, index); | |
324 | if (!page) | |
325 | return -ENOMEM; | |
326 | *pagep = page; | |
327 | ||
328 | ret = nfs_flush_incompatible(file, page); | |
329 | if (ret) { | |
330 | unlock_page(page); | |
331 | page_cache_release(page); | |
332 | } | |
333 | return ret; | |
1da177e4 LT |
334 | } |
335 | ||
4899f9c8 NP |
336 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
337 | loff_t pos, unsigned len, unsigned copied, | |
338 | struct page *page, void *fsdata) | |
1da177e4 | 339 | { |
4899f9c8 NP |
340 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
341 | int status; | |
1da177e4 LT |
342 | |
343 | lock_kernel(); | |
4899f9c8 | 344 | status = nfs_updatepage(file, page, offset, copied); |
1da177e4 | 345 | unlock_kernel(); |
4899f9c8 NP |
346 | |
347 | unlock_page(page); | |
348 | page_cache_release(page); | |
349 | ||
3d509e54 CL |
350 | if (status < 0) |
351 | return status; | |
352 | return copied; | |
1da177e4 LT |
353 | } |
354 | ||
2ff28e22 | 355 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 | 356 | { |
1c75950b TM |
357 | if (offset != 0) |
358 | return; | |
d2ccddf0 | 359 | /* Cancel any unstarted writes on this page */ |
1b3b4a1a | 360 | nfs_wb_page_cancel(page->mapping->host, page); |
cd52ed35 TM |
361 | } |
362 | ||
363 | static int nfs_release_page(struct page *page, gfp_t gfp) | |
364 | { | |
e3db7691 TM |
365 | /* If PagePrivate() is set, then the page is not freeable */ |
366 | return 0; | |
367 | } | |
368 | ||
369 | static int nfs_launder_page(struct page *page) | |
370 | { | |
371 | return nfs_wb_page(page->mapping->host, page); | |
cd52ed35 TM |
372 | } |
373 | ||
f5e54d6e | 374 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
375 | .readpage = nfs_readpage, |
376 | .readpages = nfs_readpages, | |
9cccef95 | 377 | .set_page_dirty = __set_page_dirty_nobuffers, |
1da177e4 LT |
378 | .writepage = nfs_writepage, |
379 | .writepages = nfs_writepages, | |
4899f9c8 NP |
380 | .write_begin = nfs_write_begin, |
381 | .write_end = nfs_write_end, | |
cd52ed35 TM |
382 | .invalidatepage = nfs_invalidate_page, |
383 | .releasepage = nfs_release_page, | |
1da177e4 | 384 | .direct_IO = nfs_direct_IO, |
e3db7691 | 385 | .launder_page = nfs_launder_page, |
1da177e4 LT |
386 | }; |
387 | ||
94387fb1 TM |
388 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page) |
389 | { | |
390 | struct file *filp = vma->vm_file; | |
391 | unsigned pagelen; | |
392 | int ret = -EINVAL; | |
4899f9c8 | 393 | struct address_space *mapping; |
94387fb1 TM |
394 | |
395 | lock_page(page); | |
4899f9c8 | 396 | mapping = page->mapping; |
8b1f9ee5 TM |
397 | if (mapping != vma->vm_file->f_path.dentry->d_inode->i_mapping) |
398 | goto out_unlock; | |
399 | ||
400 | ret = 0; | |
94387fb1 | 401 | pagelen = nfs_page_length(page); |
8b1f9ee5 TM |
402 | if (pagelen == 0) |
403 | goto out_unlock; | |
4899f9c8 | 404 | |
8b1f9ee5 TM |
405 | ret = nfs_flush_incompatible(filp, page); |
406 | if (ret != 0) | |
407 | goto out_unlock; | |
408 | ||
409 | ret = nfs_updatepage(filp, page, 0, pagelen); | |
410 | if (ret == 0) | |
411 | ret = pagelen; | |
412 | out_unlock: | |
413 | unlock_page(page); | |
94387fb1 TM |
414 | return ret; |
415 | } | |
416 | ||
417 | static struct vm_operations_struct nfs_file_vm_ops = { | |
418 | .fault = filemap_fault, | |
419 | .page_mkwrite = nfs_vm_page_mkwrite, | |
420 | }; | |
421 | ||
7b159fc1 TM |
422 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
423 | { | |
424 | struct nfs_open_context *ctx; | |
425 | ||
426 | if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) | |
427 | return 1; | |
cd3758e3 | 428 | ctx = nfs_file_open_context(filp); |
7b159fc1 TM |
429 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
430 | return 1; | |
431 | return 0; | |
432 | } | |
433 | ||
027445c3 BP |
434 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
435 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 436 | { |
01cce933 | 437 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
438 | struct inode * inode = dentry->d_inode; |
439 | ssize_t result; | |
027445c3 | 440 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 441 | |
1da177e4 | 442 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 443 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
1da177e4 | 444 | |
027445c3 | 445 | dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%Ld)\n", |
1da177e4 | 446 | dentry->d_parent->d_name.name, dentry->d_name.name, |
027445c3 | 447 | inode->i_ino, (unsigned long) count, (long long) pos); |
1da177e4 LT |
448 | |
449 | result = -EBUSY; | |
450 | if (IS_SWAPFILE(inode)) | |
451 | goto out_swapfile; | |
7d52e862 TM |
452 | /* |
453 | * O_APPEND implies that we must revalidate the file length. | |
454 | */ | |
455 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
456 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
457 | if (result) | |
458 | goto out; | |
fe51beec | 459 | } |
1da177e4 LT |
460 | |
461 | result = count; | |
462 | if (!count) | |
463 | goto out; | |
464 | ||
91d5b470 | 465 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
027445c3 | 466 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
200baa21 | 467 | /* Return error values for O_SYNC and IS_SYNC() */ |
7b159fc1 | 468 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
cd3758e3 | 469 | int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode); |
200baa21 TM |
470 | if (err < 0) |
471 | result = err; | |
472 | } | |
1da177e4 LT |
473 | out: |
474 | return result; | |
475 | ||
476 | out_swapfile: | |
477 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
478 | goto out; | |
479 | } | |
480 | ||
481 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) | |
482 | { | |
483 | struct inode *inode = filp->f_mapping->host; | |
484 | int status = 0; | |
485 | ||
486 | lock_kernel(); | |
039c4d7a | 487 | /* Try local locking first */ |
6d34ac19 BF |
488 | posix_test_lock(filp, fl); |
489 | if (fl->fl_type != F_UNLCK) { | |
490 | /* found a conflict */ | |
039c4d7a | 491 | goto out; |
1da177e4 | 492 | } |
039c4d7a TM |
493 | |
494 | if (nfs_have_delegation(inode, FMODE_READ)) | |
495 | goto out_noconflict; | |
496 | ||
497 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) | |
498 | goto out_noconflict; | |
499 | ||
500 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
501 | out: | |
1da177e4 LT |
502 | unlock_kernel(); |
503 | return status; | |
039c4d7a TM |
504 | out_noconflict: |
505 | fl->fl_type = F_UNLCK; | |
506 | goto out; | |
1da177e4 LT |
507 | } |
508 | ||
509 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
510 | { | |
511 | int res = 0; | |
512 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
513 | case FL_POSIX: | |
514 | res = posix_lock_file_wait(file, fl); | |
515 | break; | |
516 | case FL_FLOCK: | |
517 | res = flock_lock_file_wait(file, fl); | |
518 | break; | |
519 | default: | |
520 | BUG(); | |
521 | } | |
522 | if (res < 0) | |
46bae1a9 NB |
523 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
524 | " - error %d!\n", | |
525 | __FUNCTION__, res); | |
1da177e4 LT |
526 | return res; |
527 | } | |
528 | ||
529 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) | |
530 | { | |
531 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
532 | int status; |
533 | ||
1da177e4 LT |
534 | /* |
535 | * Flush all pending writes before doing anything | |
536 | * with locks.. | |
537 | */ | |
29884df0 | 538 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
539 | |
540 | /* NOTE: special case | |
541 | * If we're signalled while cleaning up locks on process exit, we | |
542 | * still need to complete the unlock. | |
543 | */ | |
544 | lock_kernel(); | |
545 | /* Use local locking if mounted with "-onolock" */ | |
546 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) | |
547 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
548 | else | |
549 | status = do_vfs_lock(filp, fl); | |
550 | unlock_kernel(); | |
1da177e4 LT |
551 | return status; |
552 | } | |
553 | ||
554 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) | |
555 | { | |
556 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
557 | int status; |
558 | ||
1da177e4 LT |
559 | /* |
560 | * Flush all pending writes before doing anything | |
561 | * with locks.. | |
562 | */ | |
29884df0 TM |
563 | status = nfs_sync_mapping(filp->f_mapping); |
564 | if (status != 0) | |
1da177e4 LT |
565 | goto out; |
566 | ||
567 | lock_kernel(); | |
568 | /* Use local locking if mounted with "-onolock" */ | |
569 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) { | |
570 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
571 | /* If we were signalled we still need to ensure that | |
572 | * we clean up any state on the server. We therefore | |
573 | * record the lock call as having succeeded in order to | |
574 | * ensure that locks_remove_posix() cleans it out when | |
575 | * the process exits. | |
576 | */ | |
577 | if (status == -EINTR || status == -ERESTARTSYS) | |
578 | do_vfs_lock(filp, fl); | |
579 | } else | |
580 | status = do_vfs_lock(filp, fl); | |
581 | unlock_kernel(); | |
582 | if (status < 0) | |
583 | goto out; | |
584 | /* | |
585 | * Make sure we clear the cache whenever we try to get the lock. | |
586 | * This makes locking act as a cache coherency point. | |
587 | */ | |
29884df0 | 588 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
589 | nfs_zap_caches(inode); |
590 | out: | |
1da177e4 LT |
591 | return status; |
592 | } | |
593 | ||
594 | /* | |
595 | * Lock a (portion of) a file | |
596 | */ | |
597 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
598 | { | |
599 | struct inode * inode = filp->f_mapping->host; | |
600 | ||
601 | dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n", | |
602 | inode->i_sb->s_id, inode->i_ino, | |
603 | fl->fl_type, fl->fl_flags, | |
604 | (long long)fl->fl_start, (long long)fl->fl_end); | |
91d5b470 | 605 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
606 | |
607 | /* No mandatory locks over NFS */ | |
dfad9441 | 608 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
1da177e4 LT |
609 | return -ENOLCK; |
610 | ||
611 | if (IS_GETLK(cmd)) | |
612 | return do_getlk(filp, cmd, fl); | |
613 | if (fl->fl_type == F_UNLCK) | |
614 | return do_unlk(filp, cmd, fl); | |
615 | return do_setlk(filp, cmd, fl); | |
616 | } | |
617 | ||
618 | /* | |
619 | * Lock a (portion of) a file | |
620 | */ | |
621 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
622 | { | |
1da177e4 | 623 | dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n", |
01cce933 JJS |
624 | filp->f_path.dentry->d_inode->i_sb->s_id, |
625 | filp->f_path.dentry->d_inode->i_ino, | |
1da177e4 LT |
626 | fl->fl_type, fl->fl_flags); |
627 | ||
1da177e4 LT |
628 | /* |
629 | * No BSD flocks over NFS allowed. | |
630 | * Note: we could try to fake a POSIX lock request here by | |
631 | * using ((u32) filp | 0x80000000) or some such as the pid. | |
632 | * Not sure whether that would be unique, though, or whether | |
633 | * that would break in other places. | |
634 | */ | |
635 | if (!(fl->fl_flags & FL_FLOCK)) | |
636 | return -ENOLCK; | |
637 | ||
638 | /* We're simulating flock() locks using posix locks on the server */ | |
639 | fl->fl_owner = (fl_owner_t)filp; | |
640 | fl->fl_start = 0; | |
641 | fl->fl_end = OFFSET_MAX; | |
642 | ||
643 | if (fl->fl_type == F_UNLCK) | |
644 | return do_unlk(filp, cmd, fl); | |
645 | return do_setlk(filp, cmd, fl); | |
646 | } | |
370f6599 BF |
647 | |
648 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) | |
649 | { | |
650 | /* | |
651 | * There is no protocol support for leases, so we have no way | |
652 | * to implement them correctly in the face of opens by other | |
653 | * clients. | |
654 | */ | |
655 | return -EINVAL; | |
656 | } |