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); |
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); |
46cb650c | 131 | res = nfs_open(inode, filp); |
1da177e4 LT |
132 | return res; |
133 | } | |
134 | ||
135 | static int | |
136 | nfs_file_release(struct inode *inode, struct file *filp) | |
137 | { | |
6da24bc9 CL |
138 | struct dentry *dentry = filp->f_path.dentry; |
139 | ||
140 | dprintk("NFS: release(%s/%s)\n", | |
141 | dentry->d_parent->d_name.name, | |
142 | dentry->d_name.name); | |
143 | ||
1da177e4 LT |
144 | /* Ensure that dirty pages are flushed out with the right creds */ |
145 | if (filp->f_mode & FMODE_WRITE) | |
6da24bc9 | 146 | nfs_wb_all(dentry->d_inode); |
91d5b470 | 147 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
46cb650c | 148 | return nfs_release(inode, filp); |
1da177e4 LT |
149 | } |
150 | ||
980802e3 TM |
151 | /** |
152 | * nfs_revalidate_size - Revalidate the file size | |
153 | * @inode - pointer to inode struct | |
154 | * @file - pointer to struct file | |
155 | * | |
156 | * Revalidates the file length. This is basically a wrapper around | |
157 | * nfs_revalidate_inode() that takes into account the fact that we may | |
158 | * have cached writes (in which case we don't care about the server's | |
159 | * idea of what the file length is), or O_DIRECT (in which case we | |
160 | * shouldn't trust the cache). | |
161 | */ | |
162 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
163 | { | |
164 | struct nfs_server *server = NFS_SERVER(inode); | |
165 | struct nfs_inode *nfsi = NFS_I(inode); | |
166 | ||
167 | if (server->flags & NFS_MOUNT_NOAC) | |
168 | goto force_reval; | |
169 | if (filp->f_flags & O_DIRECT) | |
170 | goto force_reval; | |
171 | if (nfsi->npages != 0) | |
172 | return 0; | |
55296809 | 173 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
fe51beec | 174 | return 0; |
980802e3 TM |
175 | force_reval: |
176 | return __nfs_revalidate_inode(server, inode); | |
177 | } | |
178 | ||
179 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
180 | { | |
9465efc9 | 181 | loff_t loff; |
e89e896d | 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 | 190 | struct inode *inode = filp->f_mapping->host; |
d5e66348 | 191 | |
980802e3 TM |
192 | int retval = nfs_revalidate_file_size(inode, filp); |
193 | if (retval < 0) | |
194 | return (loff_t)retval; | |
d5e66348 TM |
195 | |
196 | spin_lock(&inode->i_lock); | |
197 | loff = generic_file_llseek_unlocked(filp, offset, origin); | |
198 | spin_unlock(&inode->i_lock); | |
199 | } else | |
200 | loff = generic_file_llseek_unlocked(filp, offset, origin); | |
9465efc9 | 201 | return loff; |
980802e3 TM |
202 | } |
203 | ||
7b159fc1 | 204 | /* |
54917786 | 205 | * Helper for nfs_file_flush() and nfs_file_fsync() |
7b159fc1 TM |
206 | * |
207 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to | |
208 | * disk, but it retrieves and clears ctx->error after synching, despite | |
209 | * the two being set at the same time in nfs_context_set_write_error(). | |
210 | * This is because the former is used to notify the _next_ call to | |
211 | * nfs_file_write() that a write error occured, and hence cause it to | |
212 | * fall back to doing a synchronous write. | |
213 | */ | |
214 | static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) | |
215 | { | |
216 | int have_error, status; | |
217 | int ret = 0; | |
218 | ||
219 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
220 | status = nfs_wb_all(inode); | |
221 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
222 | if (have_error) | |
223 | ret = xchg(&ctx->error, 0); | |
224 | if (!ret) | |
225 | ret = status; | |
226 | return ret; | |
227 | } | |
228 | ||
1da177e4 LT |
229 | /* |
230 | * Flush all dirty pages, and check for write errors. | |
1da177e4 LT |
231 | */ |
232 | static int | |
75e1fcc0 | 233 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 | 234 | { |
cd3758e3 | 235 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
6da24bc9 CL |
236 | struct dentry *dentry = file->f_path.dentry; |
237 | struct inode *inode = dentry->d_inode; | |
1da177e4 LT |
238 | int status; |
239 | ||
6da24bc9 CL |
240 | dprintk("NFS: flush(%s/%s)\n", |
241 | dentry->d_parent->d_name.name, | |
242 | dentry->d_name.name); | |
1da177e4 LT |
243 | |
244 | if ((file->f_mode & FMODE_WRITE) == 0) | |
245 | return 0; | |
91d5b470 | 246 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
7b159fc1 | 247 | |
1da177e4 | 248 | /* Ensure that data+attribute caches are up to date after close() */ |
7b159fc1 TM |
249 | status = nfs_do_fsync(ctx, inode); |
250 | if (!status) | |
251 | nfs_revalidate_inode(NFS_SERVER(inode), inode); | |
1da177e4 LT |
252 | return status; |
253 | } | |
254 | ||
255 | static ssize_t | |
027445c3 BP |
256 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
257 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 258 | { |
01cce933 | 259 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
260 | struct inode * inode = dentry->d_inode; |
261 | ssize_t result; | |
027445c3 | 262 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 263 | |
1da177e4 | 264 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 265 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
1da177e4 | 266 | |
6da24bc9 | 267 | dprintk("NFS: read(%s/%s, %lu@%lu)\n", |
1da177e4 LT |
268 | dentry->d_parent->d_name.name, dentry->d_name.name, |
269 | (unsigned long) count, (unsigned long) pos); | |
270 | ||
44b11874 | 271 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
91d5b470 | 272 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
1da177e4 | 273 | if (!result) |
027445c3 | 274 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
275 | return result; |
276 | } | |
277 | ||
278 | static ssize_t | |
f0930fff JA |
279 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
280 | struct pipe_inode_info *pipe, size_t count, | |
281 | unsigned int flags) | |
1da177e4 | 282 | { |
01cce933 | 283 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
284 | struct inode *inode = dentry->d_inode; |
285 | ssize_t res; | |
286 | ||
6da24bc9 | 287 | dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", |
1da177e4 LT |
288 | dentry->d_parent->d_name.name, dentry->d_name.name, |
289 | (unsigned long) count, (unsigned long long) *ppos); | |
290 | ||
44b11874 | 291 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
1da177e4 | 292 | if (!res) |
f0930fff | 293 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
1da177e4 LT |
294 | return res; |
295 | } | |
296 | ||
297 | static int | |
298 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) | |
299 | { | |
01cce933 | 300 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
301 | struct inode *inode = dentry->d_inode; |
302 | int status; | |
303 | ||
6da24bc9 | 304 | dprintk("NFS: mmap(%s/%s)\n", |
1da177e4 LT |
305 | dentry->d_parent->d_name.name, dentry->d_name.name); |
306 | ||
44b11874 | 307 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
94387fb1 TM |
308 | if (!status) { |
309 | vma->vm_ops = &nfs_file_vm_ops; | |
310 | vma->vm_flags |= VM_CAN_NONLINEAR; | |
311 | file_accessed(file); | |
312 | } | |
1da177e4 LT |
313 | return status; |
314 | } | |
315 | ||
316 | /* | |
317 | * Flush any dirty pages for this process, and check for write errors. | |
318 | * The return status from this call provides a reliable indication of | |
319 | * whether any write errors occurred for this process. | |
320 | */ | |
321 | static int | |
54917786 | 322 | nfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) |
1da177e4 | 323 | { |
cd3758e3 | 324 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 325 | struct inode *inode = dentry->d_inode; |
1da177e4 | 326 | |
6da24bc9 | 327 | dprintk("NFS: fsync file(%s/%s) datasync %d\n", |
54917786 CL |
328 | dentry->d_parent->d_name.name, dentry->d_name.name, |
329 | datasync); | |
1da177e4 | 330 | |
91d5b470 | 331 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
7b159fc1 | 332 | return nfs_do_fsync(ctx, inode); |
1da177e4 LT |
333 | } |
334 | ||
335 | /* | |
4899f9c8 NP |
336 | * This does the "real" work of the write. We must allocate and lock the |
337 | * page to be sent back to the generic routine, which then copies the | |
338 | * data from user space. | |
1da177e4 LT |
339 | * |
340 | * If the writer ends up delaying the write, the writer needs to | |
341 | * increment the page use counts until he is done with the page. | |
342 | */ | |
4899f9c8 NP |
343 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
344 | loff_t pos, unsigned len, unsigned flags, | |
345 | struct page **pagep, void **fsdata) | |
1da177e4 | 346 | { |
4899f9c8 NP |
347 | int ret; |
348 | pgoff_t index; | |
349 | struct page *page; | |
350 | index = pos >> PAGE_CACHE_SHIFT; | |
351 | ||
b7eaefaa CL |
352 | dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", |
353 | file->f_path.dentry->d_parent->d_name.name, | |
354 | file->f_path.dentry->d_name.name, | |
355 | mapping->host->i_ino, len, (long long) pos); | |
356 | ||
72cb77f4 TM |
357 | /* |
358 | * Prevent starvation issues if someone is doing a consistency | |
359 | * sync-to-disk | |
360 | */ | |
361 | ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING, | |
362 | nfs_wait_bit_killable, TASK_KILLABLE); | |
363 | if (ret) | |
364 | return ret; | |
365 | ||
54566b2c | 366 | page = grab_cache_page_write_begin(mapping, index, flags); |
4899f9c8 NP |
367 | if (!page) |
368 | return -ENOMEM; | |
369 | *pagep = page; | |
370 | ||
371 | ret = nfs_flush_incompatible(file, page); | |
372 | if (ret) { | |
373 | unlock_page(page); | |
374 | page_cache_release(page); | |
375 | } | |
376 | return ret; | |
1da177e4 LT |
377 | } |
378 | ||
4899f9c8 NP |
379 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
380 | loff_t pos, unsigned len, unsigned copied, | |
381 | struct page *page, void *fsdata) | |
1da177e4 | 382 | { |
4899f9c8 NP |
383 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
384 | int status; | |
1da177e4 | 385 | |
b7eaefaa CL |
386 | dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", |
387 | file->f_path.dentry->d_parent->d_name.name, | |
388 | file->f_path.dentry->d_name.name, | |
389 | mapping->host->i_ino, len, (long long) pos); | |
390 | ||
efc91ed0 TM |
391 | /* |
392 | * Zero any uninitialised parts of the page, and then mark the page | |
393 | * as up to date if it turns out that we're extending the file. | |
394 | */ | |
395 | if (!PageUptodate(page)) { | |
396 | unsigned pglen = nfs_page_length(page); | |
397 | unsigned end = offset + len; | |
398 | ||
399 | if (pglen == 0) { | |
400 | zero_user_segments(page, 0, offset, | |
401 | end, PAGE_CACHE_SIZE); | |
402 | SetPageUptodate(page); | |
403 | } else if (end >= pglen) { | |
404 | zero_user_segment(page, end, PAGE_CACHE_SIZE); | |
405 | if (offset == 0) | |
406 | SetPageUptodate(page); | |
407 | } else | |
408 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); | |
409 | } | |
410 | ||
4899f9c8 | 411 | status = nfs_updatepage(file, page, offset, copied); |
4899f9c8 NP |
412 | |
413 | unlock_page(page); | |
414 | page_cache_release(page); | |
415 | ||
3d509e54 CL |
416 | if (status < 0) |
417 | return status; | |
418 | return copied; | |
1da177e4 LT |
419 | } |
420 | ||
2ff28e22 | 421 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 | 422 | { |
b7eaefaa CL |
423 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); |
424 | ||
1c75950b TM |
425 | if (offset != 0) |
426 | return; | |
d2ccddf0 | 427 | /* Cancel any unstarted writes on this page */ |
1b3b4a1a | 428 | nfs_wb_page_cancel(page->mapping->host, page); |
cd52ed35 TM |
429 | } |
430 | ||
431 | static int nfs_release_page(struct page *page, gfp_t gfp) | |
432 | { | |
b7eaefaa CL |
433 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
434 | ||
e3db7691 TM |
435 | /* If PagePrivate() is set, then the page is not freeable */ |
436 | return 0; | |
437 | } | |
438 | ||
439 | static int nfs_launder_page(struct page *page) | |
440 | { | |
b7eaefaa CL |
441 | struct inode *inode = page->mapping->host; |
442 | ||
443 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", | |
444 | inode->i_ino, (long long)page_offset(page)); | |
445 | ||
446 | return nfs_wb_page(inode, page); | |
cd52ed35 TM |
447 | } |
448 | ||
f5e54d6e | 449 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
450 | .readpage = nfs_readpage, |
451 | .readpages = nfs_readpages, | |
9cccef95 | 452 | .set_page_dirty = __set_page_dirty_nobuffers, |
1da177e4 LT |
453 | .writepage = nfs_writepage, |
454 | .writepages = nfs_writepages, | |
4899f9c8 NP |
455 | .write_begin = nfs_write_begin, |
456 | .write_end = nfs_write_end, | |
cd52ed35 TM |
457 | .invalidatepage = nfs_invalidate_page, |
458 | .releasepage = nfs_release_page, | |
1da177e4 | 459 | .direct_IO = nfs_direct_IO, |
e3db7691 | 460 | .launder_page = nfs_launder_page, |
1da177e4 LT |
461 | }; |
462 | ||
94387fb1 TM |
463 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct page *page) |
464 | { | |
465 | struct file *filp = vma->vm_file; | |
b7eaefaa | 466 | struct dentry *dentry = filp->f_path.dentry; |
94387fb1 TM |
467 | unsigned pagelen; |
468 | int ret = -EINVAL; | |
4899f9c8 | 469 | struct address_space *mapping; |
94387fb1 | 470 | |
b7eaefaa CL |
471 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", |
472 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
473 | filp->f_mapping->host->i_ino, | |
474 | (long long)page_offset(page)); | |
475 | ||
94387fb1 | 476 | lock_page(page); |
4899f9c8 | 477 | mapping = page->mapping; |
b7eaefaa | 478 | if (mapping != dentry->d_inode->i_mapping) |
8b1f9ee5 TM |
479 | goto out_unlock; |
480 | ||
481 | ret = 0; | |
94387fb1 | 482 | pagelen = nfs_page_length(page); |
8b1f9ee5 TM |
483 | if (pagelen == 0) |
484 | goto out_unlock; | |
4899f9c8 | 485 | |
8b1f9ee5 TM |
486 | ret = nfs_flush_incompatible(filp, page); |
487 | if (ret != 0) | |
488 | goto out_unlock; | |
489 | ||
490 | ret = nfs_updatepage(filp, page, 0, pagelen); | |
491 | if (ret == 0) | |
492 | ret = pagelen; | |
493 | out_unlock: | |
494 | unlock_page(page); | |
94387fb1 TM |
495 | return ret; |
496 | } | |
497 | ||
498 | static struct vm_operations_struct nfs_file_vm_ops = { | |
499 | .fault = filemap_fault, | |
500 | .page_mkwrite = nfs_vm_page_mkwrite, | |
501 | }; | |
502 | ||
7b159fc1 TM |
503 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
504 | { | |
505 | struct nfs_open_context *ctx; | |
506 | ||
507 | if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) | |
508 | return 1; | |
cd3758e3 | 509 | ctx = nfs_file_open_context(filp); |
7b159fc1 TM |
510 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
511 | return 1; | |
512 | return 0; | |
513 | } | |
514 | ||
027445c3 BP |
515 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
516 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 517 | { |
01cce933 | 518 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
519 | struct inode * inode = dentry->d_inode; |
520 | ssize_t result; | |
027445c3 | 521 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 522 | |
1da177e4 | 523 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 524 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
1da177e4 | 525 | |
6da24bc9 | 526 | dprintk("NFS: write(%s/%s, %lu@%Ld)\n", |
1da177e4 | 527 | dentry->d_parent->d_name.name, dentry->d_name.name, |
6da24bc9 | 528 | (unsigned long) count, (long long) pos); |
1da177e4 LT |
529 | |
530 | result = -EBUSY; | |
531 | if (IS_SWAPFILE(inode)) | |
532 | goto out_swapfile; | |
7d52e862 TM |
533 | /* |
534 | * O_APPEND implies that we must revalidate the file length. | |
535 | */ | |
536 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
537 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
538 | if (result) | |
539 | goto out; | |
fe51beec | 540 | } |
1da177e4 LT |
541 | |
542 | result = count; | |
543 | if (!count) | |
544 | goto out; | |
545 | ||
91d5b470 | 546 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
027445c3 | 547 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
200baa21 | 548 | /* Return error values for O_SYNC and IS_SYNC() */ |
7b159fc1 | 549 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
cd3758e3 | 550 | int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode); |
200baa21 TM |
551 | if (err < 0) |
552 | result = err; | |
553 | } | |
1da177e4 LT |
554 | out: |
555 | return result; | |
556 | ||
557 | out_swapfile: | |
558 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
559 | goto out; | |
560 | } | |
561 | ||
562 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) | |
563 | { | |
564 | struct inode *inode = filp->f_mapping->host; | |
565 | int status = 0; | |
566 | ||
567 | lock_kernel(); | |
039c4d7a | 568 | /* Try local locking first */ |
6d34ac19 BF |
569 | posix_test_lock(filp, fl); |
570 | if (fl->fl_type != F_UNLCK) { | |
571 | /* found a conflict */ | |
039c4d7a | 572 | goto out; |
1da177e4 | 573 | } |
039c4d7a TM |
574 | |
575 | if (nfs_have_delegation(inode, FMODE_READ)) | |
576 | goto out_noconflict; | |
577 | ||
578 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) | |
579 | goto out_noconflict; | |
580 | ||
581 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
582 | out: | |
1da177e4 LT |
583 | unlock_kernel(); |
584 | return status; | |
039c4d7a TM |
585 | out_noconflict: |
586 | fl->fl_type = F_UNLCK; | |
587 | goto out; | |
1da177e4 LT |
588 | } |
589 | ||
590 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
591 | { | |
592 | int res = 0; | |
593 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
594 | case FL_POSIX: | |
595 | res = posix_lock_file_wait(file, fl); | |
596 | break; | |
597 | case FL_FLOCK: | |
598 | res = flock_lock_file_wait(file, fl); | |
599 | break; | |
600 | default: | |
601 | BUG(); | |
602 | } | |
603 | if (res < 0) | |
46bae1a9 NB |
604 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
605 | " - error %d!\n", | |
3110ff80 | 606 | __func__, res); |
1da177e4 LT |
607 | return res; |
608 | } | |
609 | ||
610 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) | |
611 | { | |
612 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
613 | int status; |
614 | ||
1da177e4 LT |
615 | /* |
616 | * Flush all pending writes before doing anything | |
617 | * with locks.. | |
618 | */ | |
29884df0 | 619 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
620 | |
621 | /* NOTE: special case | |
622 | * If we're signalled while cleaning up locks on process exit, we | |
623 | * still need to complete the unlock. | |
624 | */ | |
625 | lock_kernel(); | |
626 | /* Use local locking if mounted with "-onolock" */ | |
627 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) | |
628 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
629 | else | |
630 | status = do_vfs_lock(filp, fl); | |
631 | unlock_kernel(); | |
1da177e4 LT |
632 | return status; |
633 | } | |
634 | ||
635 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) | |
636 | { | |
637 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
638 | int status; |
639 | ||
1da177e4 LT |
640 | /* |
641 | * Flush all pending writes before doing anything | |
642 | * with locks.. | |
643 | */ | |
29884df0 TM |
644 | status = nfs_sync_mapping(filp->f_mapping); |
645 | if (status != 0) | |
1da177e4 LT |
646 | goto out; |
647 | ||
648 | lock_kernel(); | |
649 | /* Use local locking if mounted with "-onolock" */ | |
c4d7c402 | 650 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
1da177e4 | 651 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
c4d7c402 | 652 | else |
1da177e4 LT |
653 | status = do_vfs_lock(filp, fl); |
654 | unlock_kernel(); | |
655 | if (status < 0) | |
656 | goto out; | |
657 | /* | |
658 | * Make sure we clear the cache whenever we try to get the lock. | |
659 | * This makes locking act as a cache coherency point. | |
660 | */ | |
29884df0 | 661 | nfs_sync_mapping(filp->f_mapping); |
b5418383 TM |
662 | if (!nfs_have_delegation(inode, FMODE_READ)) |
663 | nfs_zap_caches(inode); | |
1da177e4 | 664 | out: |
1da177e4 LT |
665 | return status; |
666 | } | |
667 | ||
668 | /* | |
669 | * Lock a (portion of) a file | |
670 | */ | |
671 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
672 | { | |
6da24bc9 | 673 | struct inode *inode = filp->f_mapping->host; |
2116271a | 674 | int ret = -ENOLCK; |
1da177e4 | 675 | |
6da24bc9 CL |
676 | dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", |
677 | filp->f_path.dentry->d_parent->d_name.name, | |
678 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
679 | fl->fl_type, fl->fl_flags, |
680 | (long long)fl->fl_start, (long long)fl->fl_end); | |
6da24bc9 | 681 | |
91d5b470 | 682 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
683 | |
684 | /* No mandatory locks over NFS */ | |
dfad9441 | 685 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
2116271a TM |
686 | goto out_err; |
687 | ||
688 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { | |
689 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); | |
690 | if (ret < 0) | |
691 | goto out_err; | |
692 | } | |
1da177e4 LT |
693 | |
694 | if (IS_GETLK(cmd)) | |
2116271a TM |
695 | ret = do_getlk(filp, cmd, fl); |
696 | else if (fl->fl_type == F_UNLCK) | |
697 | ret = do_unlk(filp, cmd, fl); | |
698 | else | |
699 | ret = do_setlk(filp, cmd, fl); | |
700 | out_err: | |
701 | return ret; | |
1da177e4 LT |
702 | } |
703 | ||
704 | /* | |
705 | * Lock a (portion of) a file | |
706 | */ | |
707 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
708 | { | |
6da24bc9 CL |
709 | dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", |
710 | filp->f_path.dentry->d_parent->d_name.name, | |
711 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
712 | fl->fl_type, fl->fl_flags); |
713 | ||
1da177e4 LT |
714 | if (!(fl->fl_flags & FL_FLOCK)) |
715 | return -ENOLCK; | |
716 | ||
717 | /* We're simulating flock() locks using posix locks on the server */ | |
718 | fl->fl_owner = (fl_owner_t)filp; | |
719 | fl->fl_start = 0; | |
720 | fl->fl_end = OFFSET_MAX; | |
721 | ||
722 | if (fl->fl_type == F_UNLCK) | |
723 | return do_unlk(filp, cmd, fl); | |
724 | return do_setlk(filp, cmd, fl); | |
725 | } | |
370f6599 | 726 | |
6da24bc9 CL |
727 | /* |
728 | * There is no protocol support for leases, so we have no way to implement | |
729 | * them correctly in the face of opens by other clients. | |
730 | */ | |
370f6599 BF |
731 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
732 | { | |
6da24bc9 CL |
733 | dprintk("NFS: setlease(%s/%s, arg=%ld)\n", |
734 | file->f_path.dentry->d_parent->d_name.name, | |
735 | file->f_path.dentry->d_name.name, arg); | |
736 | ||
370f6599 BF |
737 | return -EINVAL; |
738 | } |