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, | |
1da177e4 LT |
67 | .mmap = nfs_file_mmap, |
68 | .open = nfs_file_open, | |
69 | .flush = nfs_file_flush, | |
70 | .release = nfs_file_release, | |
54917786 | 71 | .fsync = nfs_file_fsync, |
1da177e4 LT |
72 | .lock = nfs_lock, |
73 | .flock = nfs_flock, | |
f0930fff | 74 | .splice_read = nfs_file_splice_read, |
1da177e4 | 75 | .check_flags = nfs_check_flags, |
370f6599 | 76 | .setlease = nfs_setlease, |
1da177e4 LT |
77 | }; |
78 | ||
92e1d5be | 79 | const struct inode_operations nfs_file_inode_operations = { |
1da177e4 LT |
80 | .permission = nfs_permission, |
81 | .getattr = nfs_getattr, | |
82 | .setattr = nfs_setattr, | |
83 | }; | |
84 | ||
b7fa0554 | 85 | #ifdef CONFIG_NFS_V3 |
92e1d5be | 86 | const struct inode_operations nfs3_file_inode_operations = { |
b7fa0554 AG |
87 | .permission = nfs_permission, |
88 | .getattr = nfs_getattr, | |
89 | .setattr = nfs_setattr, | |
90 | .listxattr = nfs3_listxattr, | |
91 | .getxattr = nfs3_getxattr, | |
92 | .setxattr = nfs3_setxattr, | |
93 | .removexattr = nfs3_removexattr, | |
94 | }; | |
95 | #endif /* CONFIG_NFS_v3 */ | |
96 | ||
1da177e4 LT |
97 | /* Hack for future NFS swap support */ |
98 | #ifndef IS_SWAPFILE | |
99 | # define IS_SWAPFILE(inode) (0) | |
100 | #endif | |
101 | ||
102 | static int nfs_check_flags(int flags) | |
103 | { | |
104 | if ((flags & (O_APPEND | O_DIRECT)) == (O_APPEND | O_DIRECT)) | |
105 | return -EINVAL; | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | /* | |
111 | * Open file | |
112 | */ | |
113 | static int | |
114 | nfs_file_open(struct inode *inode, struct file *filp) | |
115 | { | |
1da177e4 LT |
116 | int res; |
117 | ||
6da24bc9 | 118 | dprintk("NFS: open file(%s/%s)\n", |
cc0dd2d1 CL |
119 | filp->f_path.dentry->d_parent->d_name.name, |
120 | filp->f_path.dentry->d_name.name); | |
121 | ||
1da177e4 LT |
122 | res = nfs_check_flags(filp->f_flags); |
123 | if (res) | |
124 | return res; | |
125 | ||
91d5b470 | 126 | nfs_inc_stats(inode, NFSIOS_VFSOPEN); |
46cb650c | 127 | res = nfs_open(inode, filp); |
1da177e4 LT |
128 | return res; |
129 | } | |
130 | ||
131 | static int | |
132 | nfs_file_release(struct inode *inode, struct file *filp) | |
133 | { | |
6da24bc9 CL |
134 | struct dentry *dentry = filp->f_path.dentry; |
135 | ||
136 | dprintk("NFS: release(%s/%s)\n", | |
137 | dentry->d_parent->d_name.name, | |
138 | dentry->d_name.name); | |
139 | ||
91d5b470 | 140 | nfs_inc_stats(inode, NFSIOS_VFSRELEASE); |
46cb650c | 141 | return nfs_release(inode, filp); |
1da177e4 LT |
142 | } |
143 | ||
980802e3 TM |
144 | /** |
145 | * nfs_revalidate_size - Revalidate the file size | |
146 | * @inode - pointer to inode struct | |
147 | * @file - pointer to struct file | |
148 | * | |
149 | * Revalidates the file length. This is basically a wrapper around | |
150 | * nfs_revalidate_inode() that takes into account the fact that we may | |
151 | * have cached writes (in which case we don't care about the server's | |
152 | * idea of what the file length is), or O_DIRECT (in which case we | |
153 | * shouldn't trust the cache). | |
154 | */ | |
155 | static int nfs_revalidate_file_size(struct inode *inode, struct file *filp) | |
156 | { | |
157 | struct nfs_server *server = NFS_SERVER(inode); | |
158 | struct nfs_inode *nfsi = NFS_I(inode); | |
159 | ||
160 | if (server->flags & NFS_MOUNT_NOAC) | |
161 | goto force_reval; | |
162 | if (filp->f_flags & O_DIRECT) | |
163 | goto force_reval; | |
164 | if (nfsi->npages != 0) | |
165 | return 0; | |
55296809 | 166 | if (!(nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE) && !nfs_attribute_timeout(inode)) |
fe51beec | 167 | return 0; |
980802e3 TM |
168 | force_reval: |
169 | return __nfs_revalidate_inode(server, inode); | |
170 | } | |
171 | ||
172 | static loff_t nfs_file_llseek(struct file *filp, loff_t offset, int origin) | |
173 | { | |
9465efc9 | 174 | loff_t loff; |
e89e896d | 175 | |
6da24bc9 | 176 | dprintk("NFS: llseek file(%s/%s, %lld, %d)\n", |
b84e06c5 CL |
177 | filp->f_path.dentry->d_parent->d_name.name, |
178 | filp->f_path.dentry->d_name.name, | |
179 | offset, origin); | |
180 | ||
980802e3 | 181 | /* origin == SEEK_END => we must revalidate the cached file length */ |
aec5e175 | 182 | if (origin == SEEK_END) { |
980802e3 | 183 | struct inode *inode = filp->f_mapping->host; |
d5e66348 | 184 | |
980802e3 TM |
185 | int retval = nfs_revalidate_file_size(inode, filp); |
186 | if (retval < 0) | |
187 | return (loff_t)retval; | |
d5e66348 TM |
188 | |
189 | spin_lock(&inode->i_lock); | |
190 | loff = generic_file_llseek_unlocked(filp, offset, origin); | |
191 | spin_unlock(&inode->i_lock); | |
192 | } else | |
193 | loff = generic_file_llseek_unlocked(filp, offset, origin); | |
9465efc9 | 194 | return loff; |
980802e3 TM |
195 | } |
196 | ||
7b159fc1 | 197 | /* |
54917786 | 198 | * Helper for nfs_file_flush() and nfs_file_fsync() |
7b159fc1 TM |
199 | * |
200 | * Notice that it clears the NFS_CONTEXT_ERROR_WRITE before synching to | |
201 | * disk, but it retrieves and clears ctx->error after synching, despite | |
202 | * the two being set at the same time in nfs_context_set_write_error(). | |
203 | * This is because the former is used to notify the _next_ call to | |
204 | * nfs_file_write() that a write error occured, and hence cause it to | |
205 | * fall back to doing a synchronous write. | |
206 | */ | |
207 | static int nfs_do_fsync(struct nfs_open_context *ctx, struct inode *inode) | |
208 | { | |
209 | int have_error, status; | |
210 | int ret = 0; | |
211 | ||
212 | have_error = test_and_clear_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
213 | status = nfs_wb_all(inode); | |
214 | have_error |= test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags); | |
215 | if (have_error) | |
216 | ret = xchg(&ctx->error, 0); | |
217 | if (!ret) | |
218 | ret = status; | |
219 | return ret; | |
220 | } | |
221 | ||
1da177e4 LT |
222 | /* |
223 | * Flush all dirty pages, and check for write errors. | |
1da177e4 LT |
224 | */ |
225 | static int | |
75e1fcc0 | 226 | nfs_file_flush(struct file *file, fl_owner_t id) |
1da177e4 | 227 | { |
cd3758e3 | 228 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
6da24bc9 CL |
229 | struct dentry *dentry = file->f_path.dentry; |
230 | struct inode *inode = dentry->d_inode; | |
1da177e4 | 231 | |
6da24bc9 CL |
232 | dprintk("NFS: flush(%s/%s)\n", |
233 | dentry->d_parent->d_name.name, | |
234 | dentry->d_name.name); | |
1da177e4 LT |
235 | |
236 | if ((file->f_mode & FMODE_WRITE) == 0) | |
237 | return 0; | |
91d5b470 | 238 | nfs_inc_stats(inode, NFSIOS_VFSFLUSH); |
7b159fc1 | 239 | |
7fe5c398 TM |
240 | /* Flush writes to the server and return any errors */ |
241 | return nfs_do_fsync(ctx, inode); | |
1da177e4 LT |
242 | } |
243 | ||
244 | static ssize_t | |
027445c3 BP |
245 | nfs_file_read(struct kiocb *iocb, const struct iovec *iov, |
246 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 247 | { |
01cce933 | 248 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
249 | struct inode * inode = dentry->d_inode; |
250 | ssize_t result; | |
027445c3 | 251 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 252 | |
1da177e4 | 253 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 254 | return nfs_file_direct_read(iocb, iov, nr_segs, pos); |
1da177e4 | 255 | |
6da24bc9 | 256 | dprintk("NFS: read(%s/%s, %lu@%lu)\n", |
1da177e4 LT |
257 | dentry->d_parent->d_name.name, dentry->d_name.name, |
258 | (unsigned long) count, (unsigned long) pos); | |
259 | ||
44b11874 | 260 | result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); |
91d5b470 | 261 | nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, count); |
1da177e4 | 262 | if (!result) |
027445c3 | 263 | result = generic_file_aio_read(iocb, iov, nr_segs, pos); |
1da177e4 LT |
264 | return result; |
265 | } | |
266 | ||
267 | static ssize_t | |
f0930fff JA |
268 | nfs_file_splice_read(struct file *filp, loff_t *ppos, |
269 | struct pipe_inode_info *pipe, size_t count, | |
270 | unsigned int flags) | |
1da177e4 | 271 | { |
01cce933 | 272 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 LT |
273 | struct inode *inode = dentry->d_inode; |
274 | ssize_t res; | |
275 | ||
6da24bc9 | 276 | dprintk("NFS: splice_read(%s/%s, %lu@%Lu)\n", |
1da177e4 LT |
277 | dentry->d_parent->d_name.name, dentry->d_name.name, |
278 | (unsigned long) count, (unsigned long long) *ppos); | |
279 | ||
44b11874 | 280 | res = nfs_revalidate_mapping(inode, filp->f_mapping); |
1da177e4 | 281 | if (!res) |
f0930fff | 282 | res = generic_file_splice_read(filp, ppos, pipe, count, flags); |
1da177e4 LT |
283 | return res; |
284 | } | |
285 | ||
286 | static int | |
287 | nfs_file_mmap(struct file * file, struct vm_area_struct * vma) | |
288 | { | |
01cce933 | 289 | struct dentry *dentry = file->f_path.dentry; |
1da177e4 LT |
290 | struct inode *inode = dentry->d_inode; |
291 | int status; | |
292 | ||
6da24bc9 | 293 | dprintk("NFS: mmap(%s/%s)\n", |
1da177e4 LT |
294 | dentry->d_parent->d_name.name, dentry->d_name.name); |
295 | ||
e1ebfd33 TM |
296 | /* Note: generic_file_mmap() returns ENOSYS on nommu systems |
297 | * so we call that before revalidating the mapping | |
298 | */ | |
299 | status = generic_file_mmap(file, vma); | |
94387fb1 TM |
300 | if (!status) { |
301 | vma->vm_ops = &nfs_file_vm_ops; | |
e1ebfd33 | 302 | status = nfs_revalidate_mapping(inode, file->f_mapping); |
94387fb1 | 303 | } |
1da177e4 LT |
304 | return status; |
305 | } | |
306 | ||
307 | /* | |
308 | * Flush any dirty pages for this process, and check for write errors. | |
309 | * The return status from this call provides a reliable indication of | |
310 | * whether any write errors occurred for this process. | |
311 | */ | |
312 | static int | |
54917786 | 313 | nfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) |
1da177e4 | 314 | { |
cd3758e3 | 315 | struct nfs_open_context *ctx = nfs_file_open_context(file); |
1da177e4 | 316 | struct inode *inode = dentry->d_inode; |
1da177e4 | 317 | |
6da24bc9 | 318 | dprintk("NFS: fsync file(%s/%s) datasync %d\n", |
54917786 CL |
319 | dentry->d_parent->d_name.name, dentry->d_name.name, |
320 | datasync); | |
1da177e4 | 321 | |
91d5b470 | 322 | nfs_inc_stats(inode, NFSIOS_VFSFSYNC); |
7b159fc1 | 323 | return nfs_do_fsync(ctx, inode); |
1da177e4 LT |
324 | } |
325 | ||
326 | /* | |
4899f9c8 NP |
327 | * This does the "real" work of the write. We must allocate and lock the |
328 | * page to be sent back to the generic routine, which then copies the | |
329 | * data from user space. | |
1da177e4 LT |
330 | * |
331 | * If the writer ends up delaying the write, the writer needs to | |
332 | * increment the page use counts until he is done with the page. | |
333 | */ | |
4899f9c8 NP |
334 | static int nfs_write_begin(struct file *file, struct address_space *mapping, |
335 | loff_t pos, unsigned len, unsigned flags, | |
336 | struct page **pagep, void **fsdata) | |
1da177e4 | 337 | { |
4899f9c8 NP |
338 | int ret; |
339 | pgoff_t index; | |
340 | struct page *page; | |
341 | index = pos >> PAGE_CACHE_SHIFT; | |
342 | ||
b7eaefaa CL |
343 | dfprintk(PAGECACHE, "NFS: write_begin(%s/%s(%ld), %u@%lld)\n", |
344 | file->f_path.dentry->d_parent->d_name.name, | |
345 | file->f_path.dentry->d_name.name, | |
346 | mapping->host->i_ino, len, (long long) pos); | |
347 | ||
72cb77f4 TM |
348 | /* |
349 | * Prevent starvation issues if someone is doing a consistency | |
350 | * sync-to-disk | |
351 | */ | |
352 | ret = wait_on_bit(&NFS_I(mapping->host)->flags, NFS_INO_FLUSHING, | |
353 | nfs_wait_bit_killable, TASK_KILLABLE); | |
354 | if (ret) | |
355 | return ret; | |
356 | ||
54566b2c | 357 | page = grab_cache_page_write_begin(mapping, index, flags); |
4899f9c8 NP |
358 | if (!page) |
359 | return -ENOMEM; | |
360 | *pagep = page; | |
361 | ||
362 | ret = nfs_flush_incompatible(file, page); | |
363 | if (ret) { | |
364 | unlock_page(page); | |
365 | page_cache_release(page); | |
366 | } | |
367 | return ret; | |
1da177e4 LT |
368 | } |
369 | ||
4899f9c8 NP |
370 | static int nfs_write_end(struct file *file, struct address_space *mapping, |
371 | loff_t pos, unsigned len, unsigned copied, | |
372 | struct page *page, void *fsdata) | |
1da177e4 | 373 | { |
4899f9c8 NP |
374 | unsigned offset = pos & (PAGE_CACHE_SIZE - 1); |
375 | int status; | |
1da177e4 | 376 | |
b7eaefaa CL |
377 | dfprintk(PAGECACHE, "NFS: write_end(%s/%s(%ld), %u@%lld)\n", |
378 | file->f_path.dentry->d_parent->d_name.name, | |
379 | file->f_path.dentry->d_name.name, | |
380 | mapping->host->i_ino, len, (long long) pos); | |
381 | ||
efc91ed0 TM |
382 | /* |
383 | * Zero any uninitialised parts of the page, and then mark the page | |
384 | * as up to date if it turns out that we're extending the file. | |
385 | */ | |
386 | if (!PageUptodate(page)) { | |
387 | unsigned pglen = nfs_page_length(page); | |
388 | unsigned end = offset + len; | |
389 | ||
390 | if (pglen == 0) { | |
391 | zero_user_segments(page, 0, offset, | |
392 | end, PAGE_CACHE_SIZE); | |
393 | SetPageUptodate(page); | |
394 | } else if (end >= pglen) { | |
395 | zero_user_segment(page, end, PAGE_CACHE_SIZE); | |
396 | if (offset == 0) | |
397 | SetPageUptodate(page); | |
398 | } else | |
399 | zero_user_segment(page, pglen, PAGE_CACHE_SIZE); | |
400 | } | |
401 | ||
4899f9c8 | 402 | status = nfs_updatepage(file, page, offset, copied); |
4899f9c8 NP |
403 | |
404 | unlock_page(page); | |
405 | page_cache_release(page); | |
406 | ||
3d509e54 CL |
407 | if (status < 0) |
408 | return status; | |
409 | return copied; | |
1da177e4 LT |
410 | } |
411 | ||
6b9b3514 DH |
412 | /* |
413 | * Partially or wholly invalidate a page | |
414 | * - Release the private state associated with a page if undergoing complete | |
415 | * page invalidation | |
416 | * - Called if either PG_private or PG_private_2 is set on the page | |
417 | * - Caller holds page lock | |
418 | */ | |
2ff28e22 | 419 | static void nfs_invalidate_page(struct page *page, unsigned long offset) |
cd52ed35 | 420 | { |
b7eaefaa CL |
421 | dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset); |
422 | ||
1c75950b TM |
423 | if (offset != 0) |
424 | return; | |
d2ccddf0 | 425 | /* Cancel any unstarted writes on this page */ |
1b3b4a1a | 426 | nfs_wb_page_cancel(page->mapping->host, page); |
cd52ed35 TM |
427 | } |
428 | ||
6b9b3514 DH |
429 | /* |
430 | * Attempt to release the private state associated with a page | |
431 | * - Called if either PG_private or PG_private_2 is set on the page | |
432 | * - Caller holds page lock | |
433 | * - Return true (may release page) or false (may not) | |
434 | */ | |
cd52ed35 TM |
435 | static int nfs_release_page(struct page *page, gfp_t gfp) |
436 | { | |
b7eaefaa CL |
437 | dfprintk(PAGECACHE, "NFS: release_page(%p)\n", page); |
438 | ||
e3db7691 TM |
439 | /* If PagePrivate() is set, then the page is not freeable */ |
440 | return 0; | |
441 | } | |
442 | ||
6b9b3514 DH |
443 | /* |
444 | * Attempt to clear the private state associated with a page when an error | |
445 | * occurs that requires the cached contents of an inode to be written back or | |
446 | * destroyed | |
447 | * - Called if either PG_private or PG_private_2 is set on the page | |
448 | * - Caller holds page lock | |
449 | * - Return 0 if successful, -error otherwise | |
450 | */ | |
e3db7691 TM |
451 | static int nfs_launder_page(struct page *page) |
452 | { | |
b7eaefaa CL |
453 | struct inode *inode = page->mapping->host; |
454 | ||
455 | dfprintk(PAGECACHE, "NFS: launder_page(%ld, %llu)\n", | |
456 | inode->i_ino, (long long)page_offset(page)); | |
457 | ||
458 | return nfs_wb_page(inode, page); | |
cd52ed35 TM |
459 | } |
460 | ||
f5e54d6e | 461 | const struct address_space_operations nfs_file_aops = { |
1da177e4 LT |
462 | .readpage = nfs_readpage, |
463 | .readpages = nfs_readpages, | |
9cccef95 | 464 | .set_page_dirty = __set_page_dirty_nobuffers, |
1da177e4 LT |
465 | .writepage = nfs_writepage, |
466 | .writepages = nfs_writepages, | |
4899f9c8 NP |
467 | .write_begin = nfs_write_begin, |
468 | .write_end = nfs_write_end, | |
cd52ed35 TM |
469 | .invalidatepage = nfs_invalidate_page, |
470 | .releasepage = nfs_release_page, | |
1da177e4 | 471 | .direct_IO = nfs_direct_IO, |
e3db7691 | 472 | .launder_page = nfs_launder_page, |
1da177e4 LT |
473 | }; |
474 | ||
6b9b3514 DH |
475 | /* |
476 | * Notification that a PTE pointing to an NFS page is about to be made | |
477 | * writable, implying that someone is about to modify the page through a | |
478 | * shared-writable mapping | |
479 | */ | |
c2ec175c | 480 | static int nfs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
94387fb1 | 481 | { |
c2ec175c | 482 | struct page *page = vmf->page; |
94387fb1 | 483 | struct file *filp = vma->vm_file; |
b7eaefaa | 484 | struct dentry *dentry = filp->f_path.dentry; |
94387fb1 TM |
485 | unsigned pagelen; |
486 | int ret = -EINVAL; | |
4899f9c8 | 487 | struct address_space *mapping; |
94387fb1 | 488 | |
b7eaefaa CL |
489 | dfprintk(PAGECACHE, "NFS: vm_page_mkwrite(%s/%s(%ld), offset %lld)\n", |
490 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
491 | filp->f_mapping->host->i_ino, | |
492 | (long long)page_offset(page)); | |
493 | ||
94387fb1 | 494 | lock_page(page); |
4899f9c8 | 495 | mapping = page->mapping; |
b7eaefaa | 496 | if (mapping != dentry->d_inode->i_mapping) |
8b1f9ee5 TM |
497 | goto out_unlock; |
498 | ||
499 | ret = 0; | |
94387fb1 | 500 | pagelen = nfs_page_length(page); |
8b1f9ee5 TM |
501 | if (pagelen == 0) |
502 | goto out_unlock; | |
4899f9c8 | 503 | |
8b1f9ee5 TM |
504 | ret = nfs_flush_incompatible(filp, page); |
505 | if (ret != 0) | |
506 | goto out_unlock; | |
507 | ||
508 | ret = nfs_updatepage(filp, page, 0, pagelen); | |
509 | if (ret == 0) | |
510 | ret = pagelen; | |
511 | out_unlock: | |
512 | unlock_page(page); | |
c2ec175c NP |
513 | if (ret) |
514 | ret = VM_FAULT_SIGBUS; | |
94387fb1 TM |
515 | return ret; |
516 | } | |
517 | ||
518 | static struct vm_operations_struct nfs_file_vm_ops = { | |
519 | .fault = filemap_fault, | |
520 | .page_mkwrite = nfs_vm_page_mkwrite, | |
521 | }; | |
522 | ||
7b159fc1 TM |
523 | static int nfs_need_sync_write(struct file *filp, struct inode *inode) |
524 | { | |
525 | struct nfs_open_context *ctx; | |
526 | ||
527 | if (IS_SYNC(inode) || (filp->f_flags & O_SYNC)) | |
528 | return 1; | |
cd3758e3 | 529 | ctx = nfs_file_open_context(filp); |
7b159fc1 TM |
530 | if (test_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags)) |
531 | return 1; | |
532 | return 0; | |
533 | } | |
534 | ||
027445c3 BP |
535 | static ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, |
536 | unsigned long nr_segs, loff_t pos) | |
1da177e4 | 537 | { |
01cce933 | 538 | struct dentry * dentry = iocb->ki_filp->f_path.dentry; |
1da177e4 LT |
539 | struct inode * inode = dentry->d_inode; |
540 | ssize_t result; | |
027445c3 | 541 | size_t count = iov_length(iov, nr_segs); |
1da177e4 | 542 | |
1da177e4 | 543 | if (iocb->ki_filp->f_flags & O_DIRECT) |
027445c3 | 544 | return nfs_file_direct_write(iocb, iov, nr_segs, pos); |
1da177e4 | 545 | |
6da24bc9 | 546 | dprintk("NFS: write(%s/%s, %lu@%Ld)\n", |
1da177e4 | 547 | dentry->d_parent->d_name.name, dentry->d_name.name, |
6da24bc9 | 548 | (unsigned long) count, (long long) pos); |
1da177e4 LT |
549 | |
550 | result = -EBUSY; | |
551 | if (IS_SWAPFILE(inode)) | |
552 | goto out_swapfile; | |
7d52e862 TM |
553 | /* |
554 | * O_APPEND implies that we must revalidate the file length. | |
555 | */ | |
556 | if (iocb->ki_filp->f_flags & O_APPEND) { | |
557 | result = nfs_revalidate_file_size(inode, iocb->ki_filp); | |
558 | if (result) | |
559 | goto out; | |
fe51beec | 560 | } |
1da177e4 LT |
561 | |
562 | result = count; | |
563 | if (!count) | |
564 | goto out; | |
565 | ||
91d5b470 | 566 | nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, count); |
027445c3 | 567 | result = generic_file_aio_write(iocb, iov, nr_segs, pos); |
200baa21 | 568 | /* Return error values for O_SYNC and IS_SYNC() */ |
7b159fc1 | 569 | if (result >= 0 && nfs_need_sync_write(iocb->ki_filp, inode)) { |
cd3758e3 | 570 | int err = nfs_do_fsync(nfs_file_open_context(iocb->ki_filp), inode); |
200baa21 TM |
571 | if (err < 0) |
572 | result = err; | |
573 | } | |
1da177e4 LT |
574 | out: |
575 | return result; | |
576 | ||
577 | out_swapfile: | |
578 | printk(KERN_INFO "NFS: attempt to write to active swap file!\n"); | |
579 | goto out; | |
580 | } | |
581 | ||
582 | static int do_getlk(struct file *filp, int cmd, struct file_lock *fl) | |
583 | { | |
584 | struct inode *inode = filp->f_mapping->host; | |
585 | int status = 0; | |
586 | ||
587 | lock_kernel(); | |
039c4d7a | 588 | /* Try local locking first */ |
6d34ac19 BF |
589 | posix_test_lock(filp, fl); |
590 | if (fl->fl_type != F_UNLCK) { | |
591 | /* found a conflict */ | |
039c4d7a | 592 | goto out; |
1da177e4 | 593 | } |
039c4d7a TM |
594 | |
595 | if (nfs_have_delegation(inode, FMODE_READ)) | |
596 | goto out_noconflict; | |
597 | ||
598 | if (NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM) | |
599 | goto out_noconflict; | |
600 | ||
601 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
602 | out: | |
1da177e4 LT |
603 | unlock_kernel(); |
604 | return status; | |
039c4d7a TM |
605 | out_noconflict: |
606 | fl->fl_type = F_UNLCK; | |
607 | goto out; | |
1da177e4 LT |
608 | } |
609 | ||
610 | static int do_vfs_lock(struct file *file, struct file_lock *fl) | |
611 | { | |
612 | int res = 0; | |
613 | switch (fl->fl_flags & (FL_POSIX|FL_FLOCK)) { | |
614 | case FL_POSIX: | |
615 | res = posix_lock_file_wait(file, fl); | |
616 | break; | |
617 | case FL_FLOCK: | |
618 | res = flock_lock_file_wait(file, fl); | |
619 | break; | |
620 | default: | |
621 | BUG(); | |
622 | } | |
623 | if (res < 0) | |
46bae1a9 NB |
624 | dprintk(KERN_WARNING "%s: VFS is out of sync with lock manager" |
625 | " - error %d!\n", | |
3110ff80 | 626 | __func__, res); |
1da177e4 LT |
627 | return res; |
628 | } | |
629 | ||
630 | static int do_unlk(struct file *filp, int cmd, struct file_lock *fl) | |
631 | { | |
632 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
633 | int status; |
634 | ||
1da177e4 LT |
635 | /* |
636 | * Flush all pending writes before doing anything | |
637 | * with locks.. | |
638 | */ | |
29884df0 | 639 | nfs_sync_mapping(filp->f_mapping); |
1da177e4 LT |
640 | |
641 | /* NOTE: special case | |
642 | * If we're signalled while cleaning up locks on process exit, we | |
643 | * still need to complete the unlock. | |
644 | */ | |
645 | lock_kernel(); | |
646 | /* Use local locking if mounted with "-onolock" */ | |
647 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) | |
648 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); | |
649 | else | |
650 | status = do_vfs_lock(filp, fl); | |
651 | unlock_kernel(); | |
1da177e4 LT |
652 | return status; |
653 | } | |
654 | ||
655 | static int do_setlk(struct file *filp, int cmd, struct file_lock *fl) | |
656 | { | |
657 | struct inode *inode = filp->f_mapping->host; | |
1da177e4 LT |
658 | int status; |
659 | ||
1da177e4 LT |
660 | /* |
661 | * Flush all pending writes before doing anything | |
662 | * with locks.. | |
663 | */ | |
29884df0 TM |
664 | status = nfs_sync_mapping(filp->f_mapping); |
665 | if (status != 0) | |
1da177e4 LT |
666 | goto out; |
667 | ||
668 | lock_kernel(); | |
669 | /* Use local locking if mounted with "-onolock" */ | |
c4d7c402 | 670 | if (!(NFS_SERVER(inode)->flags & NFS_MOUNT_NONLM)) |
1da177e4 | 671 | status = NFS_PROTO(inode)->lock(filp, cmd, fl); |
c4d7c402 | 672 | else |
1da177e4 LT |
673 | status = do_vfs_lock(filp, fl); |
674 | unlock_kernel(); | |
675 | if (status < 0) | |
676 | goto out; | |
677 | /* | |
678 | * Make sure we clear the cache whenever we try to get the lock. | |
679 | * This makes locking act as a cache coherency point. | |
680 | */ | |
29884df0 | 681 | nfs_sync_mapping(filp->f_mapping); |
b5418383 TM |
682 | if (!nfs_have_delegation(inode, FMODE_READ)) |
683 | nfs_zap_caches(inode); | |
1da177e4 | 684 | out: |
1da177e4 LT |
685 | return status; |
686 | } | |
687 | ||
688 | /* | |
689 | * Lock a (portion of) a file | |
690 | */ | |
691 | static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) | |
692 | { | |
6da24bc9 | 693 | struct inode *inode = filp->f_mapping->host; |
2116271a | 694 | int ret = -ENOLCK; |
1da177e4 | 695 | |
6da24bc9 CL |
696 | dprintk("NFS: lock(%s/%s, t=%x, fl=%x, r=%lld:%lld)\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 | (long long)fl->fl_start, (long long)fl->fl_end); | |
6da24bc9 | 701 | |
91d5b470 | 702 | nfs_inc_stats(inode, NFSIOS_VFSLOCK); |
1da177e4 LT |
703 | |
704 | /* No mandatory locks over NFS */ | |
dfad9441 | 705 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
2116271a TM |
706 | goto out_err; |
707 | ||
708 | if (NFS_PROTO(inode)->lock_check_bounds != NULL) { | |
709 | ret = NFS_PROTO(inode)->lock_check_bounds(fl); | |
710 | if (ret < 0) | |
711 | goto out_err; | |
712 | } | |
1da177e4 LT |
713 | |
714 | if (IS_GETLK(cmd)) | |
2116271a TM |
715 | ret = do_getlk(filp, cmd, fl); |
716 | else if (fl->fl_type == F_UNLCK) | |
717 | ret = do_unlk(filp, cmd, fl); | |
718 | else | |
719 | ret = do_setlk(filp, cmd, fl); | |
720 | out_err: | |
721 | return ret; | |
1da177e4 LT |
722 | } |
723 | ||
724 | /* | |
725 | * Lock a (portion of) a file | |
726 | */ | |
727 | static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl) | |
728 | { | |
6da24bc9 CL |
729 | dprintk("NFS: flock(%s/%s, t=%x, fl=%x)\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 | ||
1da177e4 LT |
734 | if (!(fl->fl_flags & FL_FLOCK)) |
735 | return -ENOLCK; | |
736 | ||
737 | /* We're simulating flock() locks using posix locks on the server */ | |
738 | fl->fl_owner = (fl_owner_t)filp; | |
739 | fl->fl_start = 0; | |
740 | fl->fl_end = OFFSET_MAX; | |
741 | ||
742 | if (fl->fl_type == F_UNLCK) | |
743 | return do_unlk(filp, cmd, fl); | |
744 | return do_setlk(filp, cmd, fl); | |
745 | } | |
370f6599 | 746 | |
6da24bc9 CL |
747 | /* |
748 | * There is no protocol support for leases, so we have no way to implement | |
749 | * them correctly in the face of opens by other clients. | |
750 | */ | |
370f6599 BF |
751 | static int nfs_setlease(struct file *file, long arg, struct file_lock **fl) |
752 | { | |
6da24bc9 CL |
753 | dprintk("NFS: setlease(%s/%s, arg=%ld)\n", |
754 | file->f_path.dentry->d_parent->d_name.name, | |
755 | file->f_path.dentry->d_name.name, arg); | |
756 | ||
370f6599 BF |
757 | return -EINVAL; |
758 | } |