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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" | |
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, | |
240ee831 | 67 | #ifdef CONFIG_MMU |
1da177e4 | 68 | .mmap = nfs_file_mmap, |
240ee831 BW |
69 | #else |
70 | .mmap = generic_file_mmap, | |
71 | #endif | |
1da177e4 LT |
72 | .open = nfs_file_open, |
73 | .flush = nfs_file_flush, | |
74 | .release = nfs_file_release, | |
75 | .fsync = nfs_fsync, | |
76 | .lock = nfs_lock, | |
77 | .flock = nfs_flock, | |
f0930fff | 78 | .splice_read = nfs_file_splice_read, |
1da177e4 | 79 | .check_flags = nfs_check_flags, |
370f6599 | 80 | .setlease = nfs_setlease, |
1da177e4 LT |
81 | }; |
82 | ||
92e1d5be | 83 | const struct inode_operations nfs_file_inode_operations = { |
1da177e4 LT |
84 | .permission = nfs_permission, |
85 | .getattr = nfs_getattr, | |
86 | .setattr = nfs_setattr, | |
87 | }; | |
88 | ||
b7fa0554 | 89 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 90 | const struct inode_operations nfs3_file_inode_operations = { |
b7fa0554 AG |
91 | .permission = nfs_permission, |
92 | .getattr = nfs_getattr, | |
93 | .setattr = nfs_setattr, | |
94 | .listxattr = nfs3_listxattr, | |
95 | .getxattr = nfs3_getxattr, | |
96 | .setxattr = nfs3_setxattr, | |
97 | .removexattr = nfs3_removexattr, | |
98 | }; | |
99 | #endif /* CONFIG_NFS_v3 */ | |
100 | ||
1da177e4 LT |
101 | /* Hack for future NFS swap support */ |
102 | #ifndef IS_SWAPFILE | |
103 | # define IS_SWAPFILE(inode) (0) | |
104 | #endif | |
105 | ||
106 | static int nfs_check_flags(int flags) | |
107 | { | |
108 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
109 | return -EINVAL; | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
114 | /* | |
115 | * Open file | |
116 | */ | |
117 | static int | |
118 | nfs_file_open(struct inode *inode, struct file *filp) | |
119 | { | |
1da177e4 LT |
120 | int res; |
121 | ||
122 | res = nfs_check_flags(filp->f_flags); | |
123 | if (res) | |
124 | return res; | |
125 | ||
91d5b470 | 126 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
1da177e4 | 127 | lock_kernel(); |
1f163415 | 128 | res = NFS_PROTO(inode)->file_open(inode, filp); |
1da177e4 LT |
129 | unlock_kernel(); |
130 | return res; | |
131 | } | |
132 | ||
133 | static int | |
134 | nfs_file_release(struct inode *inode, struct file *filp) | |
135 | { | |
136 | /* Ensure that dirty pages are flushed out with the right creds */ | |
137 | if (filp->f_mode & FMODE_WRITE) | |
a49c3c77 | 138 | nfs_wb_all(filp->f_path.dentry->d_inode); |
91d5b470 | 139 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
1da177e4 LT |
140 | return NFS_PROTO(inode)->file_release(inode, filp); |
141 | } | |
142 | ||
980802e3 TM |
143 | /** |
144 | * nfs_revalidate_size - Revalidate the file size | |
145 | * @inode - pointer to inode struct | |
146 | * @file - pointer to struct file | |
147 | * | |
148 | * Revalidates the file length. This is basically a wrapper around | |
149 | * nfs_revalidate_inode() that takes into account the fact that we may | |
150 | * have cached writes (in which case we don't care about the server's | |
151 | * idea of what the file length is), or O_DIRECT (in which case we | |
152 | * shouldn't trust the cache). | |
153 | */ | |
154 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
155 | { | |
156 | struct nfs_server *server = NFS_SERVER(inode); | |
157 | struct nfs_inode *nfsi = NFS_I(inode); | |
158 | ||
159 | if (server->flags & NFS_MOUNT_NOAC) | |
160 | goto force_reval; | |
161 | if (filp->f_flags & O_DIRECT) | |
162 | goto force_reval; | |
163 | if (nfsi->npages != 0) | |
164 | return 0; | |
55296809 | 165 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
fe51beec | 166 | return 0; |
980802e3 TM |
167 | force_reval: |
168 | return __nfs_revalidate_inode(server, inode); | |
169 | } | |
170 | ||
171 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
172 | { | |
173 | /* origin == SEEK_END => we must revalidate the cached file length */ | |
aec5e175 | 174 | if (origin == SEEK_END) { |
980802e3 TM |
175 | struct inode *inode = filp->f_mapping->host; |
176 | int retval = nfs_revalidate_file_size(inode, filp); | |
177 | if (retval < 0) | |
178 | return (loff_t)retval; | |
179 | } | |
180 | return remote_llseek(filp, offset, origin); | |
181 | } | |
182 | ||
7b159fc1 TM |
183 | /* |
184 | * Helper for nfs_file_flush() and nfs_fsync() | |
185 | * | |
186 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to | |
187 | * disk, but it retrieves and clears ctx->error after synching, despite | |
188 | * the two being set at the same time in nfs_context_set_write_error(). | |
189 | * This is because the former is used to notify the _next_ call to | |
190 | * nfs_file_write() that a write error occured, and hence cause it to | |
191 | * fall back to doing a synchronous write. | |
192 | */ | |
193 | static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) | |
194 | { | |
195 | int have_error, status; | |
196 | int ret = 0; | |
197 | ||
198 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
199 | status = nfs_wb_all(inode); | |
200 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
201 | if (have_error) | |
202 | ret = xchg(&ctx->error, 0); | |
203 | if (!ret) | |
204 | ret = status; | |
205 | return ret; | |
206 | } | |
207 | ||
1da177e4 LT |
208 | /* |
209 | * Flush all dirty pages, and check for write errors. | |
210 | * | |
211 | */ | |
212 | static int | |
75e1fcc0 | 213 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 | 214 | { |
cd3758e3 | 215 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
01cce933 | 216 | struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
217 | int status; |
218 | ||
219 | dfprintk(VFS, "nfs: flush(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
220 | ||
221 | if ((file->f_mode & FMODE_WRITE) == 0) | |
222 | return 0; | |
91d5b470 | 223 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
7b159fc1 | 224 | |
1da177e4 | 225 | /* Ensure that data+attribute caches are up to date after close() */ |
7b159fc1 TM |
226 | status = nfs_do_fsync(ctx, inode); |
227 | if (!status) | |
228 | nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1da177e4 LT |
229 | return status; |
230 | } | |
231 | ||
232 | static ssize_t | |
027445c3 BP |
233 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
234 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 235 | { |
01cce933 | 236 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
237 | struct inode * inode = dentry->d_inode; |
238 | ssize_t result; | |
027445c3 | 239 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 240 | |
1da177e4 | 241 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 242 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
243 | |
244 | dfprintk(VFS, "nfs: read(%s/%s, %lu@%lu)\n", | |
245 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
246 | (unsigned long) count, (unsigned long) pos); | |
247 | ||
44b11874 | 248 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
91d5b470 | 249 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
1da177e4 | 250 | if (!result) |
027445c3 | 251 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
252 | return result; |
253 | } | |
254 | ||
255 | static ssize_t | |
f0930fff JA |
256 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
257 | struct pipe_inode_info *pipe, size_t count, | |
258 | unsigned int flags) | |
1da177e4 | 259 | { |
01cce933 | 260 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
261 | struct inode *inode = dentry->d_inode; |
262 | ssize_t res; | |
263 | ||
f0930fff | 264 | dfprintk(VFS, "nfs: splice_read(%s/%s, %lu@%Lu)\n", |
1da177e4 LT |
265 | dentry->d_parent->d_name.name, dentry->d_name.name, |
266 | (unsigned long) count, (unsigned long long) *ppos); | |
267 | ||
44b11874 | 268 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
1da177e4 | 269 | if (!res) |
f0930fff | 270 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
1da177e4 LT |
271 | return res; |
272 | } | |
273 | ||
274 | static int | |
275 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) | |
276 | { | |
01cce933 | 277 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
278 | struct inode *inode = dentry->d_inode; |
279 | int status; | |
280 | ||
281 | dfprintk(VFS, "nfs: mmap(%s/%s)\n", | |
282 | dentry->d_parent->d_name.name, dentry->d_name.name); | |
283 | ||
44b11874 | 284 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
94387fb1 TM |
285 | if (!status) { |
286 | vma->vm_ops = &nfs_file_vm_ops; | |
287 | vma->vm_flags |= VM_CAN_NONLINEAR; | |
288 | file_accessed(file); | |
289 | } | |
1da177e4 LT |
290 | return status; |
291 | } | |
292 | ||
293 | /* | |
294 | * Flush any dirty pages for this process, and check for write errors. | |
295 | * The return status from this call provides a reliable indication of | |
296 | * whether any write errors occurred for this process. | |
297 | */ | |
298 | static int | |
299 | nfs_fsync(struct file *file, struct dentry *dentry, int datasync) | |
300 | { | |
cd3758e3 | 301 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 302 | struct inode *inode = dentry->d_inode; |
1da177e4 LT |
303 | |
304 | dfprintk(VFS, "nfs: fsync(%s/%ld)\n", inode->i_sb->s_id, inode->i_ino); | |
305 | ||
91d5b470 | 306 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
7b159fc1 | 307 | return nfs_do_fsync(ctx, inode); |
1da177e4 LT |
308 | } |
309 | ||
310 | /* | |
4899f9c8 NP |
311 | * This does the "real" work of the write. We must allocate and lock the |
312 | * page to be sent back to the generic routine, which then copies the | |
313 | * data from user space. | |
1da177e4 LT |
314 | * |
315 | * If the writer ends up delaying the write, the writer needs to | |
316 | * increment the page use counts until he is done with the page. | |
317 | */ | |
4899f9c8 NP |
318 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
319 | loff_t pos, unsigned len, unsigned flags, | |
320 | struct page **pagep, void **fsdata) | |
1da177e4 | 321 | { |
4899f9c8 NP |
322 | int ret; |
323 | pgoff_t index; | |
324 | struct page *page; | |
325 | index = pos >> PAGE_CACHE_SHIFT; | |
326 | ||
327 | page = __grab_cache_page(mapping, index); | |
328 | if (!page) | |
329 | return -ENOMEM; | |
330 | *pagep = page; | |
331 | ||
332 | ret = nfs_flush_incompatible(file, page); | |
333 | if (ret) { | |
334 | unlock_page(page); | |
335 | page_cache_release(page); | |
336 | } | |
337 | return ret; | |
1da177e4 LT |
338 | } |
339 | ||
4899f9c8 NP |
340 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
341 | loff_t pos, unsigned len, unsigned copied, | |
342 | struct page *page, void *fsdata) | |
1da177e4 | 343 | { |
4899f9c8 NP |
344 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
345 | int status; | |
1da177e4 | 346 | |
efc91ed0 TM |
347 | /* |
348 | * Zero any uninitialised parts of the page, and then mark the page | |
349 | * as up to date if it turns out that we're extending the file. | |
350 | */ | |
351 | if (!PageUptodate(page)) { | |
352 | unsigned pglen = nfs_page_length(page); | |
353 | unsigned end = offset + len; | |
354 | ||
355 | if (pglen == 0) { | |
356 | zero_user_segments(page, 0, offset, | |
357 | end, PAGE_CACHE_SIZE); | |
358 | SetPageUptodate(page); | |
359 | } else if (end >= pglen) { | |
360 | zero_user_segment(page, end, PAGE_CACHE_SIZE); | |
361 | if (offset == 0) | |
362 | SetPageUptodate(page); | |
363 | } else | |
364 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); | |
365 | } | |
366 | ||
1da177e4 | 367 | lock_kernel(); |
4899f9c8 | 368 | status = nfs_updatepage(file, page, offset, copied); |
1da177e4 | 369 | unlock_kernel(); |
4899f9c8 NP |
370 | |
371 | unlock_page(page); | |
372 | page_cache_release(page); | |
373 | ||
3d509e54 CL |
374 | if (status < 0) |
375 | return status; | |
376 | return copied; | |
1da177e4 LT |
377 | } |
378 | ||
2ff28e22 | 379 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 | 380 | { |
1c75950b TM |
381 | if (offset != 0) |
382 | return; | |
d2ccddf0 | 383 | /* Cancel any unstarted writes on this page */ |
1b3b4a1a | 384 | nfs_wb_page_cancel(page->mapping->host, page); |
cd52ed35 TM |
385 | } |
386 | ||
387 | static int nfs_release_page(struct page *page, gfp_t gfp) | |
388 | { | |
e3db7691 TM |
389 | /* If PagePrivate() is set, then the page is not freeable */ |
390 | return 0; | |
391 | } | |
392 | ||
393 | static int nfs_launder_page(struct page *page) | |
394 | { | |
395 | return nfs_wb_page(page->mapping->host, page); | |
cd52ed35 TM |
396 | } |
397 | ||
f5e54d6e | 398 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
399 | .readpage = nfs_readpage, |
400 | .readpages = nfs_readpages, | |
9cccef95 | 401 | .set_page_dirty = __set_page_dirty_nobuffers, |
1da177e4 LT |
402 | .writepage = nfs_writepage, |
403 | .writepages = nfs_writepages, | |
4899f9c8 NP |
404 | .write_begin = nfs_write_begin, |
405 | .write_end = nfs_write_end, | |
cd52ed35 TM |
406 | .invalidatepage = nfs_invalidate_page, |
407 | .releasepage = nfs_release_page, | |
1da177e4 | 408 | .direct_IO = nfs_direct_IO, |
e3db7691 | 409 | .launder_page = nfs_launder_page, |
1da177e4 LT |
410 | }; |
411 | ||
94387fb1 TM |
412 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page) |
413 | { | |
414 | struct file *filp = vma->vm_file; | |
415 | unsigned pagelen; | |
416 | int ret = -EINVAL; | |
4899f9c8 | 417 | struct address_space *mapping; |
94387fb1 TM |
418 | |
419 | lock_page(page); | |
4899f9c8 | 420 | mapping = page->mapping; |
8b1f9ee5 TM |
421 | if (mapping != vma->vm_file->f_path.dentry->d_inode->i_mapping) |
422 | goto out_unlock; | |
423 | ||
424 | ret = 0; | |
94387fb1 | 425 | pagelen = nfs_page_length(page); |
8b1f9ee5 TM |
426 | if (pagelen == 0) |
427 | goto out_unlock; | |
4899f9c8 | 428 | |
8b1f9ee5 TM |
429 | ret = nfs_flush_incompatible(filp, page); |
430 | if (ret != 0) | |
431 | goto out_unlock; | |
432 | ||
433 | ret = nfs_updatepage(filp, page, 0, pagelen); | |
434 | if (ret == 0) | |
435 | ret = pagelen; | |
436 | out_unlock: | |
437 | unlock_page(page); | |
94387fb1 TM |
438 | return ret; |
439 | } | |
440 | ||
441 | static struct vm_operations_struct nfs_file_vm_ops = { | |
442 | .fault = filemap_fault, | |
443 | .page_mkwrite = nfs_vm_page_mkwrite, | |
444 | }; | |
445 | ||
7b159fc1 TM |
446 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
447 | { | |
448 | struct nfs_open_context *ctx; | |
449 | ||
450 | if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) | |
451 | return 1; | |
cd3758e3 | 452 | ctx = nfs_file_open_context(filp); |
7b159fc1 TM |
453 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
454 | return 1; | |
455 | return 0; | |
456 | } | |
457 | ||
027445c3 BP |
458 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
459 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 460 | { |
01cce933 | 461 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
462 | struct inode * inode = dentry->d_inode; |
463 | ssize_t result; | |
027445c3 | 464 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 465 | |
1da177e4 | 466 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 467 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
1da177e4 | 468 | |
027445c3 | 469 | dfprintk(VFS, "nfs: write(%s/%s(%ld), %lu@%Ld)\n", |
1da177e4 | 470 | dentry->d_parent->d_name.name, dentry->d_name.name, |
027445c3 | 471 | inode->i_ino, (unsigned long) count, (long long) pos); |
1da177e4 LT |
472 | |
473 | result = -EBUSY; | |
474 | if (IS_SWAPFILE(inode)) | |
475 | goto out_swapfile; | |
7d52e862 TM |
476 | /* |
477 | * O_APPEND implies that we must revalidate the file length. | |
478 | */ | |
479 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
480 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
481 | if (result) | |
482 | goto out; | |
fe51beec | 483 | } |
1da177e4 LT |
484 | |
485 | result = count; | |
486 | if (!count) | |
487 | goto out; | |
488 | ||
91d5b470 | 489 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
027445c3 | 490 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
200baa21 | 491 | /* Return error values for O_SYNC and IS_SYNC() */ |
7b159fc1 | 492 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
cd3758e3 | 493 | int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode); |
200baa21 TM |
494 | if (err < 0) |
495 | result = err; | |
496 | } | |
1da177e4 LT |
497 | out: |
498 | return result; | |
499 | ||
500 | out_swapfile: | |
501 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
502 | goto out; | |
503 | } | |
504 | ||
505 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) | |
506 | { | |
507 | struct inode *inode = filp->f_mapping->host; | |
508 | int status = 0; | |
509 | ||
510 | lock_kernel(); | |
039c4d7a | 511 | /* Try local locking first */ |
6d34ac19 BF |
512 | posix_test_lock(filp, fl); |
513 | if (fl->fl_type != F_UNLCK) { | |
514 | /* found a conflict */ | |
039c4d7a | 515 | goto out; |
1da177e4 | 516 | } |
039c4d7a TM |
517 | |
518 | if (nfs_have_delegation(inode, FMODE_READ)) | |
519 | goto out_noconflict; | |
520 | ||
521 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) | |
522 | goto out_noconflict; | |
523 | ||
524 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
525 | out: | |
1da177e4 LT |
526 | unlock_kernel(); |
527 | return status; | |
039c4d7a TM |
528 | out_noconflict: |
529 | fl->fl_type = F_UNLCK; | |
530 | goto out; | |
1da177e4 LT |
531 | } |
532 | ||
533 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
534 | { | |
535 | int res = 0; | |
536 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
537 | case FL_POSIX: | |
538 | res = posix_lock_file_wait(file, fl); | |
539 | break; | |
540 | case FL_FLOCK: | |
541 | res = flock_lock_file_wait(file, fl); | |
542 | break; | |
543 | default: | |
544 | BUG(); | |
545 | } | |
546 | if (res < 0) | |
46bae1a9 NB |
547 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
548 | " - error %d!\n", | |
3110ff80 | 549 | __func__, res); |
1da177e4 LT |
550 | return res; |
551 | } | |
552 | ||
553 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) | |
554 | { | |
555 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
556 | int status; |
557 | ||
1da177e4 LT |
558 | /* |
559 | * Flush all pending writes before doing anything | |
560 | * with locks.. | |
561 | */ | |
29884df0 | 562 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
563 | |
564 | /* NOTE: special case | |
565 | * If we're signalled while cleaning up locks on process exit, we | |
566 | * still need to complete the unlock. | |
567 | */ | |
568 | lock_kernel(); | |
569 | /* Use local locking if mounted with "-onolock" */ | |
570 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) | |
571 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
572 | else | |
573 | status = do_vfs_lock(filp, fl); | |
574 | unlock_kernel(); | |
1da177e4 LT |
575 | return status; |
576 | } | |
577 | ||
578 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) | |
579 | { | |
580 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
581 | int status; |
582 | ||
1da177e4 LT |
583 | /* |
584 | * Flush all pending writes before doing anything | |
585 | * with locks.. | |
586 | */ | |
29884df0 TM |
587 | status = nfs_sync_mapping(filp->f_mapping); |
588 | if (status != 0) | |
1da177e4 LT |
589 | goto out; |
590 | ||
591 | lock_kernel(); | |
592 | /* Use local locking if mounted with "-onolock" */ | |
c4d7c402 | 593 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
1da177e4 | 594 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
c4d7c402 | 595 | else |
1da177e4 LT |
596 | status = do_vfs_lock(filp, fl); |
597 | unlock_kernel(); | |
598 | if (status < 0) | |
599 | goto out; | |
600 | /* | |
601 | * Make sure we clear the cache whenever we try to get the lock. | |
602 | * This makes locking act as a cache coherency point. | |
603 | */ | |
29884df0 | 604 | nfs_sync_mapping(filp->f_mapping); |
b5418383 TM |
605 | if (!nfs_have_delegation(inode, FMODE_READ)) |
606 | nfs_zap_caches(inode); | |
1da177e4 | 607 | out: |
1da177e4 LT |
608 | return status; |
609 | } | |
610 | ||
611 | /* | |
612 | * Lock a (portion of) a file | |
613 | */ | |
614 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
615 | { | |
616 | struct inode * inode = filp->f_mapping->host; | |
2116271a | 617 | int ret = -ENOLCK; |
1da177e4 LT |
618 | |
619 | dprintk("NFS: nfs_lock(f=%s/%ld, t=%x, fl=%x, r=%Ld:%Ld)\n", | |
620 | inode->i_sb->s_id, inode->i_ino, | |
621 | fl->fl_type, fl->fl_flags, | |
622 | (long long)fl->fl_start, (long long)fl->fl_end); | |
91d5b470 | 623 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
624 | |
625 | /* No mandatory locks over NFS */ | |
dfad9441 | 626 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
2116271a TM |
627 | goto out_err; |
628 | ||
629 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { | |
630 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); | |
631 | if (ret < 0) | |
632 | goto out_err; | |
633 | } | |
1da177e4 LT |
634 | |
635 | if (IS_GETLK(cmd)) | |
2116271a TM |
636 | ret = do_getlk(filp, cmd, fl); |
637 | else if (fl->fl_type == F_UNLCK) | |
638 | ret = do_unlk(filp, cmd, fl); | |
639 | else | |
640 | ret = do_setlk(filp, cmd, fl); | |
641 | out_err: | |
642 | return ret; | |
1da177e4 LT |
643 | } |
644 | ||
645 | /* | |
646 | * Lock a (portion of) a file | |
647 | */ | |
648 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
649 | { | |
1da177e4 | 650 | dprintk("NFS: nfs_flock(f=%s/%ld, t=%x, fl=%x)\n", |
01cce933 JJS |
651 | filp->f_path.dentry->d_inode->i_sb->s_id, |
652 | filp->f_path.dentry->d_inode->i_ino, | |
1da177e4 LT |
653 | fl->fl_type, fl->fl_flags); |
654 | ||
1da177e4 LT |
655 | /* |
656 | * No BSD flocks over NFS allowed. | |
657 | * Note: we could try to fake a POSIX lock request here by | |
658 | * using ((u32) filp | 0x80000000) or some such as the pid. | |
659 | * Not sure whether that would be unique, though, or whether | |
660 | * that would break in other places. | |
661 | */ | |
662 | if (!(fl->fl_flags & FL_FLOCK)) | |
663 | return -ENOLCK; | |
664 | ||
665 | /* We're simulating flock() locks using posix locks on the server */ | |
666 | fl->fl_owner = (fl_owner_t)filp; | |
667 | fl->fl_start = 0; | |
668 | fl->fl_end = OFFSET_MAX; | |
669 | ||
670 | if (fl->fl_type == F_UNLCK) | |
671 | return do_unlk(filp, cmd, fl); | |
672 | return do_setlk(filp, cmd, fl); | |
673 | } | |
370f6599 BF |
674 | |
675 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) | |
676 | { | |
677 | /* | |
678 | * There is no protocol support for leases, so we have no way | |
679 | * to implement them correctly in the face of opens by other | |
680 | * clients. | |
681 | */ | |
682 | return -EINVAL; | |
683 | } |