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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); |
54917786 | 53 | static int nfs_file_fsync(struct file *, struct dentry *dentry, int datasync); |
1da177e4 LT |
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, | |
54917786 | 75 | .fsync = nfs_file_fsync, |
1da177e4 LT |
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 | ||
6da24bc9 | 122 | dprintk("NFS: open file(%s/%s)\n", |
cc0dd2d1 CL |
123 | filp->f_path.dentry->d_parent->d_name.name, |
124 | filp->f_path.dentry->d_name.name); | |
125 | ||
1da177e4 LT |
126 | res = nfs_check_flags(filp->f_flags); |
127 | if (res) | |
128 | return res; | |
129 | ||
91d5b470 | 130 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
1da177e4 | 131 | lock_kernel(); |
1f163415 | 132 | res = NFS_PROTO(inode)->file_open(inode, filp); |
1da177e4 LT |
133 | unlock_kernel(); |
134 | return res; | |
135 | } | |
136 | ||
137 | static int | |
138 | nfs_file_release(struct inode *inode, struct file *filp) | |
139 | { | |
6da24bc9 CL |
140 | struct dentry *dentry = filp->f_path.dentry; |
141 | ||
142 | dprintk("NFS: release(%s/%s)\n", | |
143 | dentry->d_parent->d_name.name, | |
144 | dentry->d_name.name); | |
145 | ||
1da177e4 LT |
146 | /* Ensure that dirty pages are flushed out with the right creds */ |
147 | if (filp->f_mode & FMODE_WRITE) | |
6da24bc9 | 148 | nfs_wb_all(dentry->d_inode); |
91d5b470 | 149 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
1da177e4 LT |
150 | return NFS_PROTO(inode)->file_release(inode, filp); |
151 | } | |
152 | ||
980802e3 TM |
153 | /** |
154 | * nfs_revalidate_size - Revalidate the file size | |
155 | * @inode - pointer to inode struct | |
156 | * @file - pointer to struct file | |
157 | * | |
158 | * Revalidates the file length. This is basically a wrapper around | |
159 | * nfs_revalidate_inode() that takes into account the fact that we may | |
160 | * have cached writes (in which case we don't care about the server's | |
161 | * idea of what the file length is), or O_DIRECT (in which case we | |
162 | * shouldn't trust the cache). | |
163 | */ | |
164 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
165 | { | |
166 | struct nfs_server *server = NFS_SERVER(inode); | |
167 | struct nfs_inode *nfsi = NFS_I(inode); | |
168 | ||
169 | if (server->flags & NFS_MOUNT_NOAC) | |
170 | goto force_reval; | |
171 | if (filp->f_flags & O_DIRECT) | |
172 | goto force_reval; | |
173 | if (nfsi->npages != 0) | |
174 | return 0; | |
55296809 | 175 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
fe51beec | 176 | return 0; |
980802e3 TM |
177 | force_reval: |
178 | return __nfs_revalidate_inode(server, inode); | |
179 | } | |
180 | ||
181 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
182 | { | |
6da24bc9 | 183 | dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
184 | filp->f_path.dentry->d_parent->d_name.name, |
185 | filp->f_path.dentry->d_name.name, | |
186 | offset, origin); | |
187 | ||
980802e3 | 188 | /* origin == SEEK_END => we must revalidate the cached file length */ |
aec5e175 | 189 | if (origin == SEEK_END) { |
980802e3 TM |
190 | struct inode *inode = filp->f_mapping->host; |
191 | int retval = nfs_revalidate_file_size(inode, filp); | |
192 | if (retval < 0) | |
193 | return (loff_t)retval; | |
194 | } | |
195 | return remote_llseek(filp, offset, origin); | |
196 | } | |
197 | ||
7b159fc1 | 198 | /* |
54917786 | 199 | * Helper for nfs_file_flush() and nfs_file_fsync() |
7b159fc1 TM |
200 | * |
201 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to | |
202 | * disk, but it retrieves and clears ctx->error after synching, despite | |
203 | * the two being set at the same time in nfs_context_set_write_error(). | |
204 | * This is because the former is used to notify the _next_ call to | |
205 | * nfs_file_write() that a write error occured, and hence cause it to | |
206 | * fall back to doing a synchronous write. | |
207 | */ | |
208 | static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) | |
209 | { | |
210 | int have_error, status; | |
211 | int ret = 0; | |
212 | ||
213 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
214 | status = nfs_wb_all(inode); | |
215 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
216 | if (have_error) | |
217 | ret = xchg(&ctx->error, 0); | |
218 | if (!ret) | |
219 | ret = status; | |
220 | return ret; | |
221 | } | |
222 | ||
1da177e4 LT |
223 | /* |
224 | * Flush all dirty pages, and check for write errors. | |
1da177e4 LT |
225 | */ |
226 | static int | |
75e1fcc0 | 227 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 | 228 | { |
cd3758e3 | 229 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
6da24bc9 CL |
230 | struct dentry *dentry = file->f_path.dentry; |
231 | struct inode *inode = dentry->d_inode; | |
1da177e4 LT |
232 | int status; |
233 | ||
6da24bc9 CL |
234 | dprintk("NFS: flush(%s/%s)\n", |
235 | dentry->d_parent->d_name.name, | |
236 | dentry->d_name.name); | |
1da177e4 LT |
237 | |
238 | if ((file->f_mode & FMODE_WRITE) == 0) | |
239 | return 0; | |
91d5b470 | 240 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
7b159fc1 | 241 | |
1da177e4 | 242 | /* Ensure that data+attribute caches are up to date after close() */ |
7b159fc1 TM |
243 | status = nfs_do_fsync(ctx, inode); |
244 | if (!status) | |
245 | nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1da177e4 LT |
246 | return status; |
247 | } | |
248 | ||
249 | static ssize_t | |
027445c3 BP |
250 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
251 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 252 | { |
01cce933 | 253 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
254 | struct inode * inode = dentry->d_inode; |
255 | ssize_t result; | |
027445c3 | 256 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 257 | |
1da177e4 | 258 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 259 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
1da177e4 | 260 | |
6da24bc9 | 261 | dprintk("NFS: read(%s/%s, %lu@%lu)\n", |
1da177e4 LT |
262 | dentry->d_parent->d_name.name, dentry->d_name.name, |
263 | (unsigned long) count, (unsigned long) pos); | |
264 | ||
44b11874 | 265 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
91d5b470 | 266 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
1da177e4 | 267 | if (!result) |
027445c3 | 268 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
269 | return result; |
270 | } | |
271 | ||
272 | static ssize_t | |
f0930fff JA |
273 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
274 | struct pipe_inode_info *pipe, size_t count, | |
275 | unsigned int flags) | |
1da177e4 | 276 | { |
01cce933 | 277 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
278 | struct inode *inode = dentry->d_inode; |
279 | ssize_t res; | |
280 | ||
6da24bc9 | 281 | dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", |
1da177e4 LT |
282 | dentry->d_parent->d_name.name, dentry->d_name.name, |
283 | (unsigned long) count, (unsigned long long) *ppos); | |
284 | ||
44b11874 | 285 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
1da177e4 | 286 | if (!res) |
f0930fff | 287 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
1da177e4 LT |
288 | return res; |
289 | } | |
290 | ||
291 | static int | |
292 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) | |
293 | { | |
01cce933 | 294 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
295 | struct inode *inode = dentry->d_inode; |
296 | int status; | |
297 | ||
6da24bc9 | 298 | dprintk("NFS: mmap(%s/%s)\n", |
1da177e4 LT |
299 | dentry->d_parent->d_name.name, dentry->d_name.name); |
300 | ||
44b11874 | 301 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
94387fb1 TM |
302 | if (!status) { |
303 | vma->vm_ops = &nfs_file_vm_ops; | |
304 | vma->vm_flags |= VM_CAN_NONLINEAR; | |
305 | file_accessed(file); | |
306 | } | |
1da177e4 LT |
307 | return status; |
308 | } | |
309 | ||
310 | /* | |
311 | * Flush any dirty pages for this process, and check for write errors. | |
312 | * The return status from this call provides a reliable indication of | |
313 | * whether any write errors occurred for this process. | |
314 | */ | |
315 | static int | |
54917786 | 316 | nfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) |
1da177e4 | 317 | { |
cd3758e3 | 318 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 319 | struct inode *inode = dentry->d_inode; |
1da177e4 | 320 | |
6da24bc9 | 321 | dprintk("NFS: fsync file(%s/%s) datasync %d\n", |
54917786 CL |
322 | dentry->d_parent->d_name.name, dentry->d_name.name, |
323 | datasync); | |
1da177e4 | 324 | |
91d5b470 | 325 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
7b159fc1 | 326 | return nfs_do_fsync(ctx, inode); |
1da177e4 LT |
327 | } |
328 | ||
329 | /* | |
4899f9c8 NP |
330 | * This does the "real" work of the write. We must allocate and lock the |
331 | * page to be sent back to the generic routine, which then copies the | |
332 | * data from user space. | |
1da177e4 LT |
333 | * |
334 | * If the writer ends up delaying the write, the writer needs to | |
335 | * increment the page use counts until he is done with the page. | |
336 | */ | |
4899f9c8 NP |
337 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
338 | loff_t pos, unsigned len, unsigned flags, | |
339 | struct page **pagep, void **fsdata) | |
1da177e4 | 340 | { |
4899f9c8 NP |
341 | int ret; |
342 | pgoff_t index; | |
343 | struct page *page; | |
344 | index = pos >> PAGE_CACHE_SHIFT; | |
345 | ||
b7eaefaa CL |
346 | dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", |
347 | file->f_path.dentry->d_parent->d_name.name, | |
348 | file->f_path.dentry->d_name.name, | |
349 | mapping->host->i_ino, len, (long long) pos); | |
350 | ||
4899f9c8 NP |
351 | page = __grab_cache_page(mapping, index); |
352 | if (!page) | |
353 | return -ENOMEM; | |
354 | *pagep = page; | |
355 | ||
356 | ret = nfs_flush_incompatible(file, page); | |
357 | if (ret) { | |
358 | unlock_page(page); | |
359 | page_cache_release(page); | |
360 | } | |
361 | return ret; | |
1da177e4 LT |
362 | } |
363 | ||
4899f9c8 NP |
364 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
365 | loff_t pos, unsigned len, unsigned copied, | |
366 | struct page *page, void *fsdata) | |
1da177e4 | 367 | { |
4899f9c8 NP |
368 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
369 | int status; | |
1da177e4 | 370 | |
b7eaefaa CL |
371 | dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", |
372 | file->f_path.dentry->d_parent->d_name.name, | |
373 | file->f_path.dentry->d_name.name, | |
374 | mapping->host->i_ino, len, (long long) pos); | |
375 | ||
efc91ed0 TM |
376 | /* |
377 | * Zero any uninitialised parts of the page, and then mark the page | |
378 | * as up to date if it turns out that we're extending the file. | |
379 | */ | |
380 | if (!PageUptodate(page)) { | |
381 | unsigned pglen = nfs_page_length(page); | |
382 | unsigned end = offset + len; | |
383 | ||
384 | if (pglen == 0) { | |
385 | zero_user_segments(page, 0, offset, | |
386 | end, PAGE_CACHE_SIZE); | |
387 | SetPageUptodate(page); | |
388 | } else if (end >= pglen) { | |
389 | zero_user_segment(page, end, PAGE_CACHE_SIZE); | |
390 | if (offset == 0) | |
391 | SetPageUptodate(page); | |
392 | } else | |
393 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); | |
394 | } | |
395 | ||
1da177e4 | 396 | lock_kernel(); |
4899f9c8 | 397 | status = nfs_updatepage(file, page, offset, copied); |
1da177e4 | 398 | unlock_kernel(); |
4899f9c8 NP |
399 | |
400 | unlock_page(page); | |
401 | page_cache_release(page); | |
402 | ||
3d509e54 CL |
403 | if (status < 0) |
404 | return status; | |
405 | return copied; | |
1da177e4 LT |
406 | } |
407 | ||
2ff28e22 | 408 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 | 409 | { |
b7eaefaa CL |
410 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); |
411 | ||
1c75950b TM |
412 | if (offset != 0) |
413 | return; | |
d2ccddf0 | 414 | /* Cancel any unstarted writes on this page */ |
1b3b4a1a | 415 | nfs_wb_page_cancel(page->mapping->host, page); |
cd52ed35 TM |
416 | } |
417 | ||
418 | static int nfs_release_page(struct page *page, gfp_t gfp) | |
419 | { | |
b7eaefaa CL |
420 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
421 | ||
e3db7691 TM |
422 | /* If PagePrivate() is set, then the page is not freeable */ |
423 | return 0; | |
424 | } | |
425 | ||
426 | static int nfs_launder_page(struct page *page) | |
427 | { | |
b7eaefaa CL |
428 | struct inode *inode = page->mapping->host; |
429 | ||
430 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", | |
431 | inode->i_ino, (long long)page_offset(page)); | |
432 | ||
433 | return nfs_wb_page(inode, page); | |
cd52ed35 TM |
434 | } |
435 | ||
f5e54d6e | 436 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
437 | .readpage = nfs_readpage, |
438 | .readpages = nfs_readpages, | |
9cccef95 | 439 | .set_page_dirty = __set_page_dirty_nobuffers, |
1da177e4 LT |
440 | .writepage = nfs_writepage, |
441 | .writepages = nfs_writepages, | |
4899f9c8 NP |
442 | .write_begin = nfs_write_begin, |
443 | .write_end = nfs_write_end, | |
cd52ed35 TM |
444 | .invalidatepage = nfs_invalidate_page, |
445 | .releasepage = nfs_release_page, | |
1da177e4 | 446 | .direct_IO = nfs_direct_IO, |
e3db7691 | 447 | .launder_page = nfs_launder_page, |
1da177e4 LT |
448 | }; |
449 | ||
94387fb1 TM |
450 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page) |
451 | { | |
452 | struct file *filp = vma->vm_file; | |
b7eaefaa | 453 | struct dentry *dentry = filp->f_path.dentry; |
94387fb1 TM |
454 | unsigned pagelen; |
455 | int ret = -EINVAL; | |
4899f9c8 | 456 | struct address_space *mapping; |
94387fb1 | 457 | |
b7eaefaa CL |
458 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", |
459 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
460 | filp->f_mapping->host->i_ino, | |
461 | (long long)page_offset(page)); | |
462 | ||
94387fb1 | 463 | lock_page(page); |
4899f9c8 | 464 | mapping = page->mapping; |
b7eaefaa | 465 | if (mapping != dentry->d_inode->i_mapping) |
8b1f9ee5 TM |
466 | goto out_unlock; |
467 | ||
468 | ret = 0; | |
94387fb1 | 469 | pagelen = nfs_page_length(page); |
8b1f9ee5 TM |
470 | if (pagelen == 0) |
471 | goto out_unlock; | |
4899f9c8 | 472 | |
8b1f9ee5 TM |
473 | ret = nfs_flush_incompatible(filp, page); |
474 | if (ret != 0) | |
475 | goto out_unlock; | |
476 | ||
477 | ret = nfs_updatepage(filp, page, 0, pagelen); | |
478 | if (ret == 0) | |
479 | ret = pagelen; | |
480 | out_unlock: | |
481 | unlock_page(page); | |
94387fb1 TM |
482 | return ret; |
483 | } | |
484 | ||
485 | static struct vm_operations_struct nfs_file_vm_ops = { | |
486 | .fault = filemap_fault, | |
487 | .page_mkwrite = nfs_vm_page_mkwrite, | |
488 | }; | |
489 | ||
7b159fc1 TM |
490 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
491 | { | |
492 | struct nfs_open_context *ctx; | |
493 | ||
494 | if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) | |
495 | return 1; | |
cd3758e3 | 496 | ctx = nfs_file_open_context(filp); |
7b159fc1 TM |
497 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
498 | return 1; | |
499 | return 0; | |
500 | } | |
501 | ||
027445c3 BP |
502 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
503 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 504 | { |
01cce933 | 505 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
506 | struct inode * inode = dentry->d_inode; |
507 | ssize_t result; | |
027445c3 | 508 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 509 | |
1da177e4 | 510 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 511 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
1da177e4 | 512 | |
6da24bc9 | 513 | dprintk("NFS: write(%s/%s, %lu@%Ld)\n", |
1da177e4 | 514 | dentry->d_parent->d_name.name, dentry->d_name.name, |
6da24bc9 | 515 | (unsigned long) count, (long long) pos); |
1da177e4 LT |
516 | |
517 | result = -EBUSY; | |
518 | if (IS_SWAPFILE(inode)) | |
519 | goto out_swapfile; | |
7d52e862 TM |
520 | /* |
521 | * O_APPEND implies that we must revalidate the file length. | |
522 | */ | |
523 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
524 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
525 | if (result) | |
526 | goto out; | |
fe51beec | 527 | } |
1da177e4 LT |
528 | |
529 | result = count; | |
530 | if (!count) | |
531 | goto out; | |
532 | ||
91d5b470 | 533 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
027445c3 | 534 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
200baa21 | 535 | /* Return error values for O_SYNC and IS_SYNC() */ |
7b159fc1 | 536 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
cd3758e3 | 537 | int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode); |
200baa21 TM |
538 | if (err < 0) |
539 | result = err; | |
540 | } | |
1da177e4 LT |
541 | out: |
542 | return result; | |
543 | ||
544 | out_swapfile: | |
545 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
546 | goto out; | |
547 | } | |
548 | ||
549 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) | |
550 | { | |
551 | struct inode *inode = filp->f_mapping->host; | |
552 | int status = 0; | |
553 | ||
554 | lock_kernel(); | |
039c4d7a | 555 | /* Try local locking first */ |
6d34ac19 BF |
556 | posix_test_lock(filp, fl); |
557 | if (fl->fl_type != F_UNLCK) { | |
558 | /* found a conflict */ | |
039c4d7a | 559 | goto out; |
1da177e4 | 560 | } |
039c4d7a TM |
561 | |
562 | if (nfs_have_delegation(inode, FMODE_READ)) | |
563 | goto out_noconflict; | |
564 | ||
565 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) | |
566 | goto out_noconflict; | |
567 | ||
568 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
569 | out: | |
1da177e4 LT |
570 | unlock_kernel(); |
571 | return status; | |
039c4d7a TM |
572 | out_noconflict: |
573 | fl->fl_type = F_UNLCK; | |
574 | goto out; | |
1da177e4 LT |
575 | } |
576 | ||
577 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
578 | { | |
579 | int res = 0; | |
580 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
581 | case FL_POSIX: | |
582 | res = posix_lock_file_wait(file, fl); | |
583 | break; | |
584 | case FL_FLOCK: | |
585 | res = flock_lock_file_wait(file, fl); | |
586 | break; | |
587 | default: | |
588 | BUG(); | |
589 | } | |
590 | if (res < 0) | |
46bae1a9 NB |
591 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
592 | " - error %d!\n", | |
3110ff80 | 593 | __func__, res); |
1da177e4 LT |
594 | return res; |
595 | } | |
596 | ||
597 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) | |
598 | { | |
599 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
600 | int status; |
601 | ||
1da177e4 LT |
602 | /* |
603 | * Flush all pending writes before doing anything | |
604 | * with locks.. | |
605 | */ | |
29884df0 | 606 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
607 | |
608 | /* NOTE: special case | |
609 | * If we're signalled while cleaning up locks on process exit, we | |
610 | * still need to complete the unlock. | |
611 | */ | |
612 | lock_kernel(); | |
613 | /* Use local locking if mounted with "-onolock" */ | |
614 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) | |
615 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
616 | else | |
617 | status = do_vfs_lock(filp, fl); | |
618 | unlock_kernel(); | |
1da177e4 LT |
619 | return status; |
620 | } | |
621 | ||
622 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) | |
623 | { | |
624 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
625 | int status; |
626 | ||
1da177e4 LT |
627 | /* |
628 | * Flush all pending writes before doing anything | |
629 | * with locks.. | |
630 | */ | |
29884df0 TM |
631 | status = nfs_sync_mapping(filp->f_mapping); |
632 | if (status != 0) | |
1da177e4 LT |
633 | goto out; |
634 | ||
635 | lock_kernel(); | |
636 | /* Use local locking if mounted with "-onolock" */ | |
c4d7c402 | 637 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
1da177e4 | 638 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
c4d7c402 | 639 | else |
1da177e4 LT |
640 | status = do_vfs_lock(filp, fl); |
641 | unlock_kernel(); | |
642 | if (status < 0) | |
643 | goto out; | |
644 | /* | |
645 | * Make sure we clear the cache whenever we try to get the lock. | |
646 | * This makes locking act as a cache coherency point. | |
647 | */ | |
29884df0 | 648 | nfs_sync_mapping(filp->f_mapping); |
b5418383 TM |
649 | if (!nfs_have_delegation(inode, FMODE_READ)) |
650 | nfs_zap_caches(inode); | |
1da177e4 | 651 | out: |
1da177e4 LT |
652 | return status; |
653 | } | |
654 | ||
655 | /* | |
656 | * Lock a (portion of) a file | |
657 | */ | |
658 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
659 | { | |
6da24bc9 | 660 | struct inode *inode = filp->f_mapping->host; |
2116271a | 661 | int ret = -ENOLCK; |
1da177e4 | 662 | |
6da24bc9 CL |
663 | dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", |
664 | filp->f_path.dentry->d_parent->d_name.name, | |
665 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
666 | fl->fl_type, fl->fl_flags, |
667 | (long long)fl->fl_start, (long long)fl->fl_end); | |
6da24bc9 | 668 | |
91d5b470 | 669 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
670 | |
671 | /* No mandatory locks over NFS */ | |
dfad9441 | 672 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
2116271a TM |
673 | goto out_err; |
674 | ||
675 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { | |
676 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); | |
677 | if (ret < 0) | |
678 | goto out_err; | |
679 | } | |
1da177e4 LT |
680 | |
681 | if (IS_GETLK(cmd)) | |
2116271a TM |
682 | ret = do_getlk(filp, cmd, fl); |
683 | else if (fl->fl_type == F_UNLCK) | |
684 | ret = do_unlk(filp, cmd, fl); | |
685 | else | |
686 | ret = do_setlk(filp, cmd, fl); | |
687 | out_err: | |
688 | return ret; | |
1da177e4 LT |
689 | } |
690 | ||
691 | /* | |
692 | * Lock a (portion of) a file | |
693 | */ | |
694 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
695 | { | |
6da24bc9 CL |
696 | dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", |
697 | filp->f_path.dentry->d_parent->d_name.name, | |
698 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
699 | fl->fl_type, fl->fl_flags); |
700 | ||
1da177e4 LT |
701 | /* |
702 | * No BSD flocks over NFS allowed. | |
703 | * Note: we could try to fake a POSIX lock request here by | |
704 | * using ((u32) filp | 0x80000000) or some such as the pid. | |
705 | * Not sure whether that would be unique, though, or whether | |
706 | * that would break in other places. | |
707 | */ | |
708 | if (!(fl->fl_flags & FL_FLOCK)) | |
709 | return -ENOLCK; | |
710 | ||
711 | /* We're simulating flock() locks using posix locks on the server */ | |
712 | fl->fl_owner = (fl_owner_t)filp; | |
713 | fl->fl_start = 0; | |
714 | fl->fl_end = OFFSET_MAX; | |
715 | ||
716 | if (fl->fl_type == F_UNLCK) | |
717 | return do_unlk(filp, cmd, fl); | |
718 | return do_setlk(filp, cmd, fl); | |
719 | } | |
370f6599 | 720 | |
6da24bc9 CL |
721 | /* |
722 | * There is no protocol support for leases, so we have no way to implement | |
723 | * them correctly in the face of opens by other clients. | |
724 | */ | |
370f6599 BF |
725 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
726 | { | |
6da24bc9 CL |
727 | dprintk("NFS: setlease(%s/%s, arg=%ld)\n", |
728 | file->f_path.dentry->d_parent->d_name.name, | |
729 | file->f_path.dentry->d_name.name, arg); | |
730 | ||
370f6599 BF |
731 | return -EINVAL; |
732 | } |