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" |
545db45f | 38 | #include "fscache.h" |
1da177e4 LT |
39 | |
40 | #define NFSDBG_FACILITY NFSDBG_FILE | |
41 | ||
42 | static int nfs_file_open(struct inode *, struct file *); | |
43 | static int nfs_file_release(struct inode *, struct file *); | |
980802e3 | 44 | static loff_t nfs_file_llseek(struct file *file, loff_t offset, int origin); |
1da177e4 | 45 | static int nfs_file_mmap(struct file *, struct vm_area_struct *); |
f0930fff JA |
46 | static ssize_t nfs_file_splice_read(struct file *filp, loff_t *ppos, |
47 | struct pipe_inode_info *pipe, | |
48 | size_t count, unsigned int flags); | |
027445c3 BP |
49 | static ssize_t nfs_file_read(struct kiocb *, const struct iovec *iov, |
50 | unsigned long nr_segs, loff_t pos); | |
bf40d343 SJ |
51 | static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, |
52 | struct file *filp, loff_t *ppos, | |
53 | size_t count, unsigned int flags); | |
027445c3 BP |
54 | static ssize_t nfs_file_write(struct kiocb *, const struct iovec *iov, |
55 | unsigned long nr_segs, loff_t pos); | |
75e1fcc0 | 56 | static int nfs_file_flush(struct file *, fl_owner_t id); |
54917786 | 57 | static int nfs_file_fsync(struct file *, struct dentry *dentry, int datasync); |
1da177e4 LT |
58 | static int nfs_check_flags(int flags); |
59 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl); | |
60 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl); | |
370f6599 | 61 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl); |
1da177e4 | 62 | |
94387fb1 TM |
63 | static struct vm_operations_struct nfs_file_vm_ops; |
64 | ||
4b6f5d20 | 65 | const struct file_operations nfs_file_operations = { |
980802e3 | 66 | .llseek = nfs_file_llseek, |
1da177e4 LT |
67 | .read = do_sync_read, |
68 | .write = do_sync_write, | |
027445c3 BP |
69 | .aio_read = nfs_file_read, |
70 | .aio_write = nfs_file_write, | |
1da177e4 LT |
71 | .mmap = nfs_file_mmap, |
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, |
bf40d343 | 79 | .splice_write = nfs_file_splice_write, |
1da177e4 | 80 | .check_flags = nfs_check_flags, |
370f6599 | 81 | .setlease = nfs_setlease, |
1da177e4 LT |
82 | }; |
83 | ||
92e1d5be | 84 | const struct inode_operations nfs_file_inode_operations = { |
1da177e4 LT |
85 | .permission = nfs_permission, |
86 | .getattr = nfs_getattr, | |
87 | .setattr = nfs_setattr, | |
88 | }; | |
89 | ||
b7fa0554 | 90 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 91 | const struct inode_operations nfs3_file_inode_operations = { |
b7fa0554 AG |
92 | .permission = nfs_permission, |
93 | .getattr = nfs_getattr, | |
94 | .setattr = nfs_setattr, | |
95 | .listxattr = nfs3_listxattr, | |
96 | .getxattr = nfs3_getxattr, | |
97 | .setxattr = nfs3_setxattr, | |
98 | .removexattr = nfs3_removexattr, | |
99 | }; | |
100 | #endif /* CONFIG_NFS_v3 */ | |
101 | ||
1da177e4 LT |
102 | /* Hack for future NFS swap support */ |
103 | #ifndef IS_SWAPFILE | |
104 | # define IS_SWAPFILE(inode) (0) | |
105 | #endif | |
106 | ||
107 | static int nfs_check_flags(int flags) | |
108 | { | |
109 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
110 | return -EINVAL; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | /* | |
116 | * Open file | |
117 | */ | |
118 | static int | |
119 | nfs_file_open(struct inode *inode, struct file *filp) | |
120 | { | |
1da177e4 LT |
121 | int res; |
122 | ||
6da24bc9 | 123 | dprintk("NFS: open file(%s/%s)\n", |
cc0dd2d1 CL |
124 | filp->f_path.dentry->d_parent->d_name.name, |
125 | filp->f_path.dentry->d_name.name); | |
126 | ||
1da177e4 LT |
127 | res = nfs_check_flags(filp->f_flags); |
128 | if (res) | |
129 | return res; | |
130 | ||
91d5b470 | 131 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
46cb650c | 132 | res = nfs_open(inode, filp); |
1da177e4 LT |
133 | return res; |
134 | } | |
135 | ||
136 | static int | |
137 | nfs_file_release(struct inode *inode, struct file *filp) | |
138 | { | |
6da24bc9 CL |
139 | struct dentry *dentry = filp->f_path.dentry; |
140 | ||
141 | dprintk("NFS: release(%s/%s)\n", | |
142 | dentry->d_parent->d_name.name, | |
143 | dentry->d_name.name); | |
144 | ||
91d5b470 | 145 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
46cb650c | 146 | return nfs_release(inode, filp); |
1da177e4 LT |
147 | } |
148 | ||
980802e3 TM |
149 | /** |
150 | * nfs_revalidate_size - Revalidate the file size | |
151 | * @inode - pointer to inode struct | |
152 | * @file - pointer to struct file | |
153 | * | |
154 | * Revalidates the file length. This is basically a wrapper around | |
155 | * nfs_revalidate_inode() that takes into account the fact that we may | |
156 | * have cached writes (in which case we don't care about the server's | |
157 | * idea of what the file length is), or O_DIRECT (in which case we | |
158 | * shouldn't trust the cache). | |
159 | */ | |
160 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
161 | { | |
162 | struct nfs_server *server = NFS_SERVER(inode); | |
163 | struct nfs_inode *nfsi = NFS_I(inode); | |
164 | ||
165 | if (server->flags & NFS_MOUNT_NOAC) | |
166 | goto force_reval; | |
167 | if (filp->f_flags & O_DIRECT) | |
168 | goto force_reval; | |
169 | if (nfsi->npages != 0) | |
170 | return 0; | |
55296809 | 171 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
fe51beec | 172 | return 0; |
980802e3 TM |
173 | force_reval: |
174 | return __nfs_revalidate_inode(server, inode); | |
175 | } | |
176 | ||
177 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
178 | { | |
9465efc9 | 179 | loff_t loff; |
e89e896d | 180 | |
6da24bc9 | 181 | dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
182 | filp->f_path.dentry->d_parent->d_name.name, |
183 | filp->f_path.dentry->d_name.name, | |
184 | offset, origin); | |
185 | ||
980802e3 | 186 | /* origin == SEEK_END => we must revalidate the cached file length */ |
aec5e175 | 187 | if (origin == SEEK_END) { |
980802e3 | 188 | struct inode *inode = filp->f_mapping->host; |
d5e66348 | 189 | |
980802e3 TM |
190 | int retval = nfs_revalidate_file_size(inode, filp); |
191 | if (retval < 0) | |
192 | return (loff_t)retval; | |
d5e66348 TM |
193 | |
194 | spin_lock(&inode->i_lock); | |
195 | loff = generic_file_llseek_unlocked(filp, offset, origin); | |
196 | spin_unlock(&inode->i_lock); | |
197 | } else | |
198 | loff = generic_file_llseek_unlocked(filp, offset, origin); | |
9465efc9 | 199 | return loff; |
980802e3 TM |
200 | } |
201 | ||
7b159fc1 | 202 | /* |
54917786 | 203 | * Helper for nfs_file_flush() and nfs_file_fsync() |
7b159fc1 TM |
204 | * |
205 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to | |
206 | * disk, but it retrieves and clears ctx->error after synching, despite | |
207 | * the two being set at the same time in nfs_context_set_write_error(). | |
208 | * This is because the former is used to notify the _next_ call to | |
209 | * nfs_file_write() that a write error occured, and hence cause it to | |
210 | * fall back to doing a synchronous write. | |
211 | */ | |
212 | static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) | |
213 | { | |
214 | int have_error, status; | |
215 | int ret = 0; | |
216 | ||
217 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
218 | status = nfs_wb_all(inode); | |
219 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
220 | if (have_error) | |
221 | ret = xchg(&ctx->error, 0); | |
222 | if (!ret) | |
223 | ret = status; | |
224 | return ret; | |
225 | } | |
226 | ||
1da177e4 LT |
227 | /* |
228 | * Flush all dirty pages, and check for write errors. | |
1da177e4 LT |
229 | */ |
230 | static int | |
75e1fcc0 | 231 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 | 232 | { |
cd3758e3 | 233 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
6da24bc9 CL |
234 | struct dentry *dentry = file->f_path.dentry; |
235 | struct inode *inode = dentry->d_inode; | |
1da177e4 | 236 | |
6da24bc9 CL |
237 | dprintk("NFS: flush(%s/%s)\n", |
238 | dentry->d_parent->d_name.name, | |
239 | dentry->d_name.name); | |
1da177e4 LT |
240 | |
241 | if ((file->f_mode & FMODE_WRITE) == 0) | |
242 | return 0; | |
91d5b470 | 243 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
7b159fc1 | 244 | |
7fe5c398 TM |
245 | /* Flush writes to the server and return any errors */ |
246 | return nfs_do_fsync(ctx, inode); | |
1da177e4 LT |
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 | ||
e1ebfd33 TM |
301 | /* Note: generic_file_mmap() returns ENOSYS on nommu systems |
302 | * so we call that before revalidating the mapping | |
303 | */ | |
304 | status = generic_file_mmap(file, vma); | |
94387fb1 TM |
305 | if (!status) { |
306 | vma->vm_ops = &nfs_file_vm_ops; | |
e1ebfd33 | 307 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
94387fb1 | 308 | } |
1da177e4 LT |
309 | return status; |
310 | } | |
311 | ||
312 | /* | |
313 | * Flush any dirty pages for this process, and check for write errors. | |
314 | * The return status from this call provides a reliable indication of | |
315 | * whether any write errors occurred for this process. | |
316 | */ | |
317 | static int | |
54917786 | 318 | nfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) |
1da177e4 | 319 | { |
cd3758e3 | 320 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 321 | struct inode *inode = dentry->d_inode; |
1da177e4 | 322 | |
6da24bc9 | 323 | dprintk("NFS: fsync file(%s/%s) datasync %d\n", |
54917786 CL |
324 | dentry->d_parent->d_name.name, dentry->d_name.name, |
325 | datasync); | |
1da177e4 | 326 | |
91d5b470 | 327 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
7b159fc1 | 328 | return nfs_do_fsync(ctx, inode); |
1da177e4 LT |
329 | } |
330 | ||
331 | /* | |
4899f9c8 NP |
332 | * This does the "real" work of the write. We must allocate and lock the |
333 | * page to be sent back to the generic routine, which then copies the | |
334 | * data from user space. | |
1da177e4 LT |
335 | * |
336 | * If the writer ends up delaying the write, the writer needs to | |
337 | * increment the page use counts until he is done with the page. | |
338 | */ | |
4899f9c8 NP |
339 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
340 | loff_t pos, unsigned len, unsigned flags, | |
341 | struct page **pagep, void **fsdata) | |
1da177e4 | 342 | { |
4899f9c8 NP |
343 | int ret; |
344 | pgoff_t index; | |
345 | struct page *page; | |
346 | index = pos >> PAGE_CACHE_SHIFT; | |
347 | ||
b7eaefaa CL |
348 | dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", |
349 | file->f_path.dentry->d_parent->d_name.name, | |
350 | file->f_path.dentry->d_name.name, | |
351 | mapping->host->i_ino, len, (long long) pos); | |
352 | ||
72cb77f4 TM |
353 | /* |
354 | * Prevent starvation issues if someone is doing a consistency | |
355 | * sync-to-disk | |
356 | */ | |
357 | ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING, | |
358 | nfs_wait_bit_killable, TASK_KILLABLE); | |
359 | if (ret) | |
360 | return ret; | |
361 | ||
54566b2c | 362 | page = grab_cache_page_write_begin(mapping, index, flags); |
4899f9c8 NP |
363 | if (!page) |
364 | return -ENOMEM; | |
365 | *pagep = page; | |
366 | ||
367 | ret = nfs_flush_incompatible(file, page); | |
368 | if (ret) { | |
369 | unlock_page(page); | |
370 | page_cache_release(page); | |
371 | } | |
372 | return ret; | |
1da177e4 LT |
373 | } |
374 | ||
4899f9c8 NP |
375 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
376 | loff_t pos, unsigned len, unsigned copied, | |
377 | struct page *page, void *fsdata) | |
1da177e4 | 378 | { |
4899f9c8 NP |
379 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
380 | int status; | |
1da177e4 | 381 | |
b7eaefaa CL |
382 | dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", |
383 | file->f_path.dentry->d_parent->d_name.name, | |
384 | file->f_path.dentry->d_name.name, | |
385 | mapping->host->i_ino, len, (long long) pos); | |
386 | ||
efc91ed0 TM |
387 | /* |
388 | * Zero any uninitialised parts of the page, and then mark the page | |
389 | * as up to date if it turns out that we're extending the file. | |
390 | */ | |
391 | if (!PageUptodate(page)) { | |
392 | unsigned pglen = nfs_page_length(page); | |
393 | unsigned end = offset + len; | |
394 | ||
395 | if (pglen == 0) { | |
396 | zero_user_segments(page, 0, offset, | |
397 | end, PAGE_CACHE_SIZE); | |
398 | SetPageUptodate(page); | |
399 | } else if (end >= pglen) { | |
400 | zero_user_segment(page, end, PAGE_CACHE_SIZE); | |
401 | if (offset == 0) | |
402 | SetPageUptodate(page); | |
403 | } else | |
404 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); | |
405 | } | |
406 | ||
4899f9c8 | 407 | status = nfs_updatepage(file, page, offset, copied); |
4899f9c8 NP |
408 | |
409 | unlock_page(page); | |
410 | page_cache_release(page); | |
411 | ||
3d509e54 CL |
412 | if (status < 0) |
413 | return status; | |
414 | return copied; | |
1da177e4 LT |
415 | } |
416 | ||
6b9b3514 DH |
417 | /* |
418 | * Partially or wholly invalidate a page | |
419 | * - Release the private state associated with a page if undergoing complete | |
420 | * page invalidation | |
545db45f | 421 | * - Called if either PG_private or PG_fscache is set on the page |
6b9b3514 DH |
422 | * - Caller holds page lock |
423 | */ | |
2ff28e22 | 424 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 | 425 | { |
b7eaefaa CL |
426 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); |
427 | ||
1c75950b TM |
428 | if (offset != 0) |
429 | return; | |
d2ccddf0 | 430 | /* Cancel any unstarted writes on this page */ |
1b3b4a1a | 431 | nfs_wb_page_cancel(page->mapping->host, page); |
545db45f DH |
432 | |
433 | nfs_fscache_invalidate_page(page, page->mapping->host); | |
cd52ed35 TM |
434 | } |
435 | ||
6b9b3514 DH |
436 | /* |
437 | * Attempt to release the private state associated with a page | |
545db45f | 438 | * - Called if either PG_private or PG_fscache is set on the page |
6b9b3514 DH |
439 | * - Caller holds page lock |
440 | * - Return true (may release page) or false (may not) | |
441 | */ | |
cd52ed35 TM |
442 | static int nfs_release_page(struct page *page, gfp_t gfp) |
443 | { | |
b7eaefaa CL |
444 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
445 | ||
e3db7691 | 446 | /* If PagePrivate() is set, then the page is not freeable */ |
545db45f DH |
447 | if (PagePrivate(page)) |
448 | return 0; | |
449 | return nfs_fscache_release_page(page, gfp); | |
e3db7691 TM |
450 | } |
451 | ||
6b9b3514 DH |
452 | /* |
453 | * Attempt to clear the private state associated with a page when an error | |
454 | * occurs that requires the cached contents of an inode to be written back or | |
455 | * destroyed | |
545db45f | 456 | * - Called if either PG_private or fscache is set on the page |
6b9b3514 DH |
457 | * - Caller holds page lock |
458 | * - Return 0 if successful, -error otherwise | |
459 | */ | |
e3db7691 TM |
460 | static int nfs_launder_page(struct page *page) |
461 | { | |
b7eaefaa | 462 | struct inode *inode = page->mapping->host; |
545db45f | 463 | struct nfs_inode *nfsi = NFS_I(inode); |
b7eaefaa CL |
464 | |
465 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", | |
466 | inode->i_ino, (long long)page_offset(page)); | |
467 | ||
545db45f | 468 | nfs_fscache_wait_on_page_write(nfsi, page); |
b7eaefaa | 469 | return nfs_wb_page(inode, page); |
cd52ed35 TM |
470 | } |
471 | ||
f5e54d6e | 472 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
473 | .readpage = nfs_readpage, |
474 | .readpages = nfs_readpages, | |
9cccef95 | 475 | .set_page_dirty = __set_page_dirty_nobuffers, |
1da177e4 LT |
476 | .writepage = nfs_writepage, |
477 | .writepages = nfs_writepages, | |
4899f9c8 NP |
478 | .write_begin = nfs_write_begin, |
479 | .write_end = nfs_write_end, | |
cd52ed35 TM |
480 | .invalidatepage = nfs_invalidate_page, |
481 | .releasepage = nfs_release_page, | |
1da177e4 | 482 | .direct_IO = nfs_direct_IO, |
e3db7691 | 483 | .launder_page = nfs_launder_page, |
1da177e4 LT |
484 | }; |
485 | ||
6b9b3514 DH |
486 | /* |
487 | * Notification that a PTE pointing to an NFS page is about to be made | |
488 | * writable, implying that someone is about to modify the page through a | |
489 | * shared-writable mapping | |
490 | */ | |
c2ec175c | 491 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
94387fb1 | 492 | { |
c2ec175c | 493 | struct page *page = vmf->page; |
94387fb1 | 494 | struct file *filp = vma->vm_file; |
b7eaefaa | 495 | struct dentry *dentry = filp->f_path.dentry; |
94387fb1 TM |
496 | unsigned pagelen; |
497 | int ret = -EINVAL; | |
4899f9c8 | 498 | struct address_space *mapping; |
94387fb1 | 499 | |
b7eaefaa CL |
500 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", |
501 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
502 | filp->f_mapping->host->i_ino, | |
503 | (long long)page_offset(page)); | |
504 | ||
545db45f DH |
505 | /* make sure the cache has finished storing the page */ |
506 | nfs_fscache_wait_on_page_write(NFS_I(dentry->d_inode), page); | |
507 | ||
94387fb1 | 508 | lock_page(page); |
4899f9c8 | 509 | mapping = page->mapping; |
b7eaefaa | 510 | if (mapping != dentry->d_inode->i_mapping) |
8b1f9ee5 TM |
511 | goto out_unlock; |
512 | ||
513 | ret = 0; | |
94387fb1 | 514 | pagelen = nfs_page_length(page); |
8b1f9ee5 TM |
515 | if (pagelen == 0) |
516 | goto out_unlock; | |
4899f9c8 | 517 | |
8b1f9ee5 TM |
518 | ret = nfs_flush_incompatible(filp, page); |
519 | if (ret != 0) | |
520 | goto out_unlock; | |
521 | ||
522 | ret = nfs_updatepage(filp, page, 0, pagelen); | |
8b1f9ee5 | 523 | out_unlock: |
7fdf5230 TM |
524 | if (!ret) |
525 | return VM_FAULT_LOCKED; | |
8b1f9ee5 | 526 | unlock_page(page); |
7fdf5230 | 527 | return VM_FAULT_SIGBUS; |
94387fb1 TM |
528 | } |
529 | ||
530 | static struct vm_operations_struct nfs_file_vm_ops = { | |
531 | .fault = filemap_fault, | |
532 | .page_mkwrite = nfs_vm_page_mkwrite, | |
533 | }; | |
534 | ||
7b159fc1 TM |
535 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
536 | { | |
537 | struct nfs_open_context *ctx; | |
538 | ||
539 | if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) | |
540 | return 1; | |
cd3758e3 | 541 | ctx = nfs_file_open_context(filp); |
7b159fc1 TM |
542 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
543 | return 1; | |
544 | return 0; | |
545 | } | |
546 | ||
027445c3 BP |
547 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
548 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 549 | { |
01cce933 | 550 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
551 | struct inode * inode = dentry->d_inode; |
552 | ssize_t result; | |
027445c3 | 553 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 554 | |
1da177e4 | 555 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 556 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
1da177e4 | 557 | |
6da24bc9 | 558 | dprintk("NFS: write(%s/%s, %lu@%Ld)\n", |
1da177e4 | 559 | dentry->d_parent->d_name.name, dentry->d_name.name, |
6da24bc9 | 560 | (unsigned long) count, (long long) pos); |
1da177e4 LT |
561 | |
562 | result = -EBUSY; | |
563 | if (IS_SWAPFILE(inode)) | |
564 | goto out_swapfile; | |
7d52e862 TM |
565 | /* |
566 | * O_APPEND implies that we must revalidate the file length. | |
567 | */ | |
568 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
569 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
570 | if (result) | |
571 | goto out; | |
fe51beec | 572 | } |
1da177e4 LT |
573 | |
574 | result = count; | |
575 | if (!count) | |
576 | goto out; | |
577 | ||
91d5b470 | 578 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
027445c3 | 579 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
200baa21 | 580 | /* Return error values for O_SYNC and IS_SYNC() */ |
7b159fc1 | 581 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
cd3758e3 | 582 | int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode); |
200baa21 TM |
583 | if (err < 0) |
584 | result = err; | |
585 | } | |
1da177e4 LT |
586 | out: |
587 | return result; | |
588 | ||
589 | out_swapfile: | |
590 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
591 | goto out; | |
592 | } | |
593 | ||
bf40d343 SJ |
594 | static ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, |
595 | struct file *filp, loff_t *ppos, | |
596 | size_t count, unsigned int flags) | |
597 | { | |
598 | struct dentry *dentry = filp->f_path.dentry; | |
599 | struct inode *inode = dentry->d_inode; | |
600 | ssize_t ret; | |
601 | ||
602 | dprintk("NFS splice_write(%s/%s, %lu@%llu)\n", | |
603 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
604 | (unsigned long) count, (unsigned long long) *ppos); | |
605 | ||
606 | /* | |
607 | * The combination of splice and an O_APPEND destination is disallowed. | |
608 | */ | |
609 | ||
610 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); | |
611 | ||
612 | ret = generic_file_splice_write(pipe, filp, ppos, count, flags); | |
613 | if (ret >= 0 && nfs_need_sync_write(filp, inode)) { | |
614 | int err = nfs_do_fsync(nfs_file_open_context(filp), inode); | |
615 | if (err < 0) | |
616 | ret = err; | |
617 | } | |
618 | return ret; | |
619 | } | |
620 | ||
1da177e4 LT |
621 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) |
622 | { | |
623 | struct inode *inode = filp->f_mapping->host; | |
624 | int status = 0; | |
625 | ||
039c4d7a | 626 | /* Try local locking first */ |
6d34ac19 BF |
627 | posix_test_lock(filp, fl); |
628 | if (fl->fl_type != F_UNLCK) { | |
629 | /* found a conflict */ | |
039c4d7a | 630 | goto out; |
1da177e4 | 631 | } |
039c4d7a TM |
632 | |
633 | if (nfs_have_delegation(inode, FMODE_READ)) | |
634 | goto out_noconflict; | |
635 | ||
636 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) | |
637 | goto out_noconflict; | |
638 | ||
639 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
640 | out: | |
1da177e4 | 641 | return status; |
039c4d7a TM |
642 | out_noconflict: |
643 | fl->fl_type = F_UNLCK; | |
644 | goto out; | |
1da177e4 LT |
645 | } |
646 | ||
647 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
648 | { | |
649 | int res = 0; | |
650 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
651 | case FL_POSIX: | |
652 | res = posix_lock_file_wait(file, fl); | |
653 | break; | |
654 | case FL_FLOCK: | |
655 | res = flock_lock_file_wait(file, fl); | |
656 | break; | |
657 | default: | |
658 | BUG(); | |
659 | } | |
660 | if (res < 0) | |
46bae1a9 NB |
661 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
662 | " - error %d!\n", | |
3110ff80 | 663 | __func__, res); |
1da177e4 LT |
664 | return res; |
665 | } | |
666 | ||
667 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) | |
668 | { | |
669 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
670 | int status; |
671 | ||
1da177e4 LT |
672 | /* |
673 | * Flush all pending writes before doing anything | |
674 | * with locks.. | |
675 | */ | |
29884df0 | 676 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
677 | |
678 | /* NOTE: special case | |
679 | * If we're signalled while cleaning up locks on process exit, we | |
680 | * still need to complete the unlock. | |
681 | */ | |
1da177e4 LT |
682 | /* Use local locking if mounted with "-onolock" */ |
683 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) | |
684 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
685 | else | |
686 | status = do_vfs_lock(filp, fl); | |
1da177e4 LT |
687 | return status; |
688 | } | |
689 | ||
690 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) | |
691 | { | |
692 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
693 | int status; |
694 | ||
1da177e4 LT |
695 | /* |
696 | * Flush all pending writes before doing anything | |
697 | * with locks.. | |
698 | */ | |
29884df0 TM |
699 | status = nfs_sync_mapping(filp->f_mapping); |
700 | if (status != 0) | |
1da177e4 LT |
701 | goto out; |
702 | ||
1da177e4 | 703 | /* Use local locking if mounted with "-onolock" */ |
c4d7c402 | 704 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
1da177e4 | 705 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
c4d7c402 | 706 | else |
1da177e4 | 707 | status = do_vfs_lock(filp, fl); |
1da177e4 LT |
708 | if (status < 0) |
709 | goto out; | |
710 | /* | |
711 | * Make sure we clear the cache whenever we try to get the lock. | |
712 | * This makes locking act as a cache coherency point. | |
713 | */ | |
29884df0 | 714 | nfs_sync_mapping(filp->f_mapping); |
b5418383 TM |
715 | if (!nfs_have_delegation(inode, FMODE_READ)) |
716 | nfs_zap_caches(inode); | |
1da177e4 | 717 | out: |
1da177e4 LT |
718 | return status; |
719 | } | |
720 | ||
721 | /* | |
722 | * Lock a (portion of) a file | |
723 | */ | |
724 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
725 | { | |
6da24bc9 | 726 | struct inode *inode = filp->f_mapping->host; |
2116271a | 727 | int ret = -ENOLCK; |
1da177e4 | 728 | |
6da24bc9 CL |
729 | dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\n", |
730 | filp->f_path.dentry->d_parent->d_name.name, | |
731 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
732 | fl->fl_type, fl->fl_flags, |
733 | (long long)fl->fl_start, (long long)fl->fl_end); | |
6da24bc9 | 734 | |
91d5b470 | 735 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
736 | |
737 | /* No mandatory locks over NFS */ | |
dfad9441 | 738 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
2116271a TM |
739 | goto out_err; |
740 | ||
741 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { | |
742 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); | |
743 | if (ret < 0) | |
744 | goto out_err; | |
745 | } | |
1da177e4 LT |
746 | |
747 | if (IS_GETLK(cmd)) | |
2116271a TM |
748 | ret = do_getlk(filp, cmd, fl); |
749 | else if (fl->fl_type == F_UNLCK) | |
750 | ret = do_unlk(filp, cmd, fl); | |
751 | else | |
752 | ret = do_setlk(filp, cmd, fl); | |
753 | out_err: | |
754 | return ret; | |
1da177e4 LT |
755 | } |
756 | ||
757 | /* | |
758 | * Lock a (portion of) a file | |
759 | */ | |
760 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
761 | { | |
6da24bc9 CL |
762 | dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\n", |
763 | filp->f_path.dentry->d_parent->d_name.name, | |
764 | filp->f_path.dentry->d_name.name, | |
1da177e4 LT |
765 | fl->fl_type, fl->fl_flags); |
766 | ||
1da177e4 LT |
767 | if (!(fl->fl_flags & FL_FLOCK)) |
768 | return -ENOLCK; | |
769 | ||
770 | /* We're simulating flock() locks using posix locks on the server */ | |
771 | fl->fl_owner = (fl_owner_t)filp; | |
772 | fl->fl_start = 0; | |
773 | fl->fl_end = OFFSET_MAX; | |
774 | ||
775 | if (fl->fl_type == F_UNLCK) | |
776 | return do_unlk(filp, cmd, fl); | |
777 | return do_setlk(filp, cmd, fl); | |
778 | } | |
370f6599 | 779 | |
6da24bc9 CL |
780 | /* |
781 | * There is no protocol support for leases, so we have no way to implement | |
782 | * them correctly in the face of opens by other clients. | |
783 | */ | |
370f6599 BF |
784 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
785 | { | |
6da24bc9 CL |
786 | dprintk("NFS: setlease(%s/%s, arg=%ld)\n", |
787 | file->f_path.dentry->d_parent->d_name.name, | |
788 | file->f_path.dentry->d_name.name, arg); | |
789 | ||
370f6599 BF |
790 | return -EINVAL; |
791 | } |