Commit | Line | Data |
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e69e7fe5 EVH |
1 | /* |
2 | * linux/fs/9p/vfs_file.c | |
3 | * | |
4 | * This file contians vfs file ops for 9P2000. | |
5 | * | |
6 | * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> | |
7 | * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
42e8c509 EVH |
10 | * it under the terms of the GNU General Public License version 2 |
11 | * as published by the Free Software Foundation. | |
e69e7fe5 EVH |
12 | * |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to: | |
20 | * Free Software Foundation | |
21 | * 51 Franklin Street, Fifth Floor | |
22 | * Boston, MA 02111-1301 USA | |
23 | * | |
24 | */ | |
25 | ||
26 | #include <linux/module.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/fs.h> | |
914e2637 | 29 | #include <linux/sched.h> |
e69e7fe5 EVH |
30 | #include <linux/file.h> |
31 | #include <linux/stat.h> | |
32 | #include <linux/string.h> | |
e69e7fe5 | 33 | #include <linux/inet.h> |
e69e7fe5 | 34 | #include <linux/list.h> |
637d020a | 35 | #include <linux/pagemap.h> |
a099027c | 36 | #include <linux/utsname.h> |
e69e7fe5 EVH |
37 | #include <asm/uaccess.h> |
38 | #include <linux/idr.h> | |
bd238fb4 LI |
39 | #include <net/9p/9p.h> |
40 | #include <net/9p/client.h> | |
e69e7fe5 | 41 | |
e69e7fe5 | 42 | #include "v9fs.h" |
e69e7fe5 EVH |
43 | #include "v9fs_vfs.h" |
44 | #include "fid.h" | |
60e78d2c | 45 | #include "cache.h" |
e69e7fe5 | 46 | |
7263cebe AK |
47 | static const struct vm_operations_struct v9fs_file_vm_ops; |
48 | ||
e69e7fe5 EVH |
49 | /** |
50 | * v9fs_file_open - open a file (or directory) | |
51 | * @inode: inode to be opened | |
52 | * @file: file being opened | |
53 | * | |
54 | */ | |
55 | ||
56 | int v9fs_file_open(struct inode *inode, struct file *file) | |
57 | { | |
6a3124a3 | 58 | int err; |
6b39f6d2 | 59 | struct v9fs_inode *v9inode; |
bd238fb4 LI |
60 | struct v9fs_session_info *v9ses; |
61 | struct p9_fid *fid; | |
62 | int omode; | |
e69e7fe5 | 63 | |
ef56547e | 64 | P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file); |
6b39f6d2 | 65 | v9inode = V9FS_I(inode); |
bd238fb4 | 66 | v9ses = v9fs_inode2v9ses(inode); |
ef56547e MK |
67 | if (v9fs_proto_dotl(v9ses)) |
68 | omode = file->f_flags; | |
69 | else | |
70 | omode = v9fs_uflags2omode(file->f_flags, | |
71 | v9fs_proto_dotu(v9ses)); | |
bd238fb4 LI |
72 | fid = file->private_data; |
73 | if (!fid) { | |
74 | fid = v9fs_fid_clone(file->f_path.dentry); | |
75 | if (IS_ERR(fid)) | |
76 | return PTR_ERR(fid); | |
77 | ||
78 | err = p9_client_open(fid, omode); | |
9523a841 | 79 | if (err < 0) { |
bd238fb4 LI |
80 | p9_client_clunk(fid); |
81 | return err; | |
82 | } | |
ef56547e | 83 | if (file->f_flags & O_TRUNC) { |
7549ae3e | 84 | i_size_write(inode, 0); |
9523a841 EVH |
85 | inode->i_blocks = 0; |
86 | } | |
ef56547e MK |
87 | if ((file->f_flags & O_APPEND) && |
88 | (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) | |
2e4bef41 | 89 | generic_file_llseek(file, 0, SEEK_END); |
6a3124a3 | 90 | } |
e69e7fe5 | 91 | |
bd238fb4 | 92 | file->private_data = fid; |
5a7e0a8c | 93 | mutex_lock(&v9inode->v_mutex); |
6b39f6d2 | 94 | if (v9ses->cache && !v9inode->writeback_fid) { |
3cf387d7 | 95 | /* |
6b39f6d2 | 96 | * clone a fid and add it to writeback_fid |
3cf387d7 AK |
97 | * we do it during open time instead of |
98 | * page dirty time via write_begin/page_mkwrite | |
99 | * because we want write after unlink usecase | |
100 | * to work. | |
101 | */ | |
102 | fid = v9fs_writeback_fid(file->f_path.dentry); | |
103 | if (IS_ERR(fid)) { | |
104 | err = PTR_ERR(fid); | |
5a7e0a8c | 105 | mutex_unlock(&v9inode->v_mutex); |
3cf387d7 AK |
106 | goto out_error; |
107 | } | |
6b39f6d2 | 108 | v9inode->writeback_fid = (void *) fid; |
3cf387d7 | 109 | } |
5a7e0a8c | 110 | mutex_unlock(&v9inode->v_mutex); |
29236f4e | 111 | #ifdef CONFIG_9P_FSCACHE |
46848de0 | 112 | if (v9ses->cache) |
60e78d2c | 113 | v9fs_cache_inode_set_cookie(inode, file); |
29236f4e | 114 | #endif |
6a3124a3 | 115 | return 0; |
3cf387d7 AK |
116 | out_error: |
117 | p9_client_clunk(file->private_data); | |
118 | file->private_data = NULL; | |
119 | return err; | |
e69e7fe5 EVH |
120 | } |
121 | ||
122 | /** | |
123 | * v9fs_file_lock - lock a file (or directory) | |
ee443996 EVH |
124 | * @filp: file to be locked |
125 | * @cmd: lock command | |
126 | * @fl: file lock structure | |
e69e7fe5 | 127 | * |
ee443996 | 128 | * Bugs: this looks like a local only lock, we should extend into 9P |
e69e7fe5 EVH |
129 | * by using open exclusive |
130 | */ | |
131 | ||
132 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
133 | { | |
134 | int res = 0; | |
d6f787bc | 135 | struct inode *inode = filp->f_path.dentry->d_inode; |
e69e7fe5 | 136 | |
bd238fb4 | 137 | P9_DPRINTK(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
e69e7fe5 EVH |
138 | |
139 | /* No mandatory locks */ | |
f78233dd | 140 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
e69e7fe5 EVH |
141 | return -ENOLCK; |
142 | ||
143 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 144 | filemap_write_and_wait(inode->i_mapping); |
fc0ecff6 | 145 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
e69e7fe5 EVH |
146 | } |
147 | ||
148 | return res; | |
149 | } | |
150 | ||
a099027c MK |
151 | static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) |
152 | { | |
153 | struct p9_flock flock; | |
154 | struct p9_fid *fid; | |
155 | uint8_t status; | |
156 | int res = 0; | |
157 | unsigned char fl_type; | |
158 | ||
159 | fid = filp->private_data; | |
160 | BUG_ON(fid == NULL); | |
161 | ||
162 | if ((fl->fl_flags & FL_POSIX) != FL_POSIX) | |
163 | BUG(); | |
164 | ||
165 | res = posix_lock_file_wait(filp, fl); | |
166 | if (res < 0) | |
167 | goto out; | |
168 | ||
169 | /* convert posix lock to p9 tlock args */ | |
170 | memset(&flock, 0, sizeof(flock)); | |
171 | flock.type = fl->fl_type; | |
172 | flock.start = fl->fl_start; | |
173 | if (fl->fl_end == OFFSET_MAX) | |
174 | flock.length = 0; | |
175 | else | |
176 | flock.length = fl->fl_end - fl->fl_start + 1; | |
177 | flock.proc_id = fl->fl_pid; | |
178 | flock.client_id = utsname()->nodename; | |
179 | if (IS_SETLKW(cmd)) | |
180 | flock.flags = P9_LOCK_FLAGS_BLOCK; | |
181 | ||
182 | /* | |
183 | * if its a blocked request and we get P9_LOCK_BLOCKED as the status | |
184 | * for lock request, keep on trying | |
185 | */ | |
186 | for (;;) { | |
187 | res = p9_client_lock_dotl(fid, &flock, &status); | |
188 | if (res < 0) | |
189 | break; | |
190 | ||
191 | if (status != P9_LOCK_BLOCKED) | |
192 | break; | |
193 | if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd)) | |
194 | break; | |
195 | schedule_timeout_interruptible(P9_LOCK_TIMEOUT); | |
196 | } | |
197 | ||
198 | /* map 9p status to VFS status */ | |
199 | switch (status) { | |
200 | case P9_LOCK_SUCCESS: | |
201 | res = 0; | |
202 | break; | |
203 | case P9_LOCK_BLOCKED: | |
204 | res = -EAGAIN; | |
205 | break; | |
206 | case P9_LOCK_ERROR: | |
207 | case P9_LOCK_GRACE: | |
208 | res = -ENOLCK; | |
209 | break; | |
210 | default: | |
211 | BUG(); | |
212 | } | |
213 | ||
214 | /* | |
215 | * incase server returned error for lock request, revert | |
216 | * it locally | |
217 | */ | |
218 | if (res < 0 && fl->fl_type != F_UNLCK) { | |
219 | fl_type = fl->fl_type; | |
220 | fl->fl_type = F_UNLCK; | |
221 | res = posix_lock_file_wait(filp, fl); | |
222 | fl->fl_type = fl_type; | |
223 | } | |
224 | out: | |
225 | return res; | |
226 | } | |
227 | ||
1d769cd1 MK |
228 | static int v9fs_file_getlock(struct file *filp, struct file_lock *fl) |
229 | { | |
230 | struct p9_getlock glock; | |
231 | struct p9_fid *fid; | |
232 | int res = 0; | |
233 | ||
234 | fid = filp->private_data; | |
235 | BUG_ON(fid == NULL); | |
236 | ||
237 | posix_test_lock(filp, fl); | |
238 | /* | |
239 | * if we have a conflicting lock locally, no need to validate | |
240 | * with server | |
241 | */ | |
242 | if (fl->fl_type != F_UNLCK) | |
243 | return res; | |
244 | ||
245 | /* convert posix lock to p9 tgetlock args */ | |
246 | memset(&glock, 0, sizeof(glock)); | |
247 | glock.type = fl->fl_type; | |
248 | glock.start = fl->fl_start; | |
249 | if (fl->fl_end == OFFSET_MAX) | |
250 | glock.length = 0; | |
251 | else | |
252 | glock.length = fl->fl_end - fl->fl_start + 1; | |
253 | glock.proc_id = fl->fl_pid; | |
254 | glock.client_id = utsname()->nodename; | |
255 | ||
256 | res = p9_client_getlock_dotl(fid, &glock); | |
257 | if (res < 0) | |
258 | return res; | |
259 | if (glock.type != F_UNLCK) { | |
260 | fl->fl_type = glock.type; | |
261 | fl->fl_start = glock.start; | |
262 | if (glock.length == 0) | |
263 | fl->fl_end = OFFSET_MAX; | |
264 | else | |
265 | fl->fl_end = glock.start + glock.length - 1; | |
266 | fl->fl_pid = glock.proc_id; | |
267 | } else | |
268 | fl->fl_type = F_UNLCK; | |
269 | ||
270 | return res; | |
271 | } | |
272 | ||
a099027c MK |
273 | /** |
274 | * v9fs_file_lock_dotl - lock a file (or directory) | |
275 | * @filp: file to be locked | |
276 | * @cmd: lock command | |
277 | * @fl: file lock structure | |
278 | * | |
279 | */ | |
280 | ||
281 | static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl) | |
282 | { | |
283 | struct inode *inode = filp->f_path.dentry->d_inode; | |
284 | int ret = -ENOLCK; | |
285 | ||
286 | P9_DPRINTK(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", filp, | |
287 | cmd, fl, filp->f_path.dentry->d_name.name); | |
288 | ||
289 | /* No mandatory locks */ | |
290 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
291 | goto out_err; | |
292 | ||
293 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
294 | filemap_write_and_wait(inode->i_mapping); | |
295 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
296 | } | |
297 | ||
298 | if (IS_SETLK(cmd) || IS_SETLKW(cmd)) | |
299 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
1d769cd1 MK |
300 | else if (IS_GETLK(cmd)) |
301 | ret = v9fs_file_getlock(filp, fl); | |
a099027c MK |
302 | else |
303 | ret = -EINVAL; | |
304 | out_err: | |
305 | return ret; | |
306 | } | |
307 | ||
308 | /** | |
309 | * v9fs_file_flock_dotl - lock a file | |
310 | * @filp: file to be locked | |
311 | * @cmd: lock command | |
312 | * @fl: file lock structure | |
313 | * | |
314 | */ | |
315 | ||
316 | static int v9fs_file_flock_dotl(struct file *filp, int cmd, | |
317 | struct file_lock *fl) | |
318 | { | |
319 | struct inode *inode = filp->f_path.dentry->d_inode; | |
320 | int ret = -ENOLCK; | |
321 | ||
322 | P9_DPRINTK(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", filp, | |
323 | cmd, fl, filp->f_path.dentry->d_name.name); | |
324 | ||
325 | /* No mandatory locks */ | |
326 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
327 | goto out_err; | |
328 | ||
329 | if (!(fl->fl_flags & FL_FLOCK)) | |
330 | goto out_err; | |
331 | ||
332 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
333 | filemap_write_and_wait(inode->i_mapping); | |
334 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
335 | } | |
336 | /* Convert flock to posix lock */ | |
337 | fl->fl_owner = (fl_owner_t)filp; | |
338 | fl->fl_start = 0; | |
339 | fl->fl_end = OFFSET_MAX; | |
340 | fl->fl_flags |= FL_POSIX; | |
341 | fl->fl_flags ^= FL_FLOCK; | |
342 | ||
343 | if (IS_SETLK(cmd) | IS_SETLKW(cmd)) | |
344 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
345 | else | |
346 | ret = -EINVAL; | |
347 | out_err: | |
348 | return ret; | |
349 | } | |
350 | ||
e69e7fe5 | 351 | /** |
17311779 AK |
352 | * v9fs_fid_readn - read from a fid |
353 | * @fid: fid to read | |
e69e7fe5 | 354 | * @data: data buffer to read data into |
fbedadc1 | 355 | * @udata: user data buffer to read data into |
e69e7fe5 EVH |
356 | * @count: size of buffer |
357 | * @offset: offset at which to read data | |
358 | * | |
359 | */ | |
fbedadc1 | 360 | ssize_t |
17311779 | 361 | v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count, |
fbedadc1 EVH |
362 | u64 offset) |
363 | { | |
97e8442b | 364 | int n, total, size; |
fbedadc1 | 365 | |
51a87c55 | 366 | P9_DPRINTK(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", fid->fid, |
17311779 | 367 | (long long unsigned) offset, count); |
fbedadc1 EVH |
368 | n = 0; |
369 | total = 0; | |
97e8442b | 370 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
fbedadc1 EVH |
371 | do { |
372 | n = p9_client_read(fid, data, udata, offset, count); | |
373 | if (n <= 0) | |
374 | break; | |
375 | ||
376 | if (data) | |
377 | data += n; | |
378 | if (udata) | |
379 | udata += n; | |
380 | ||
381 | offset += n; | |
382 | count -= n; | |
383 | total += n; | |
97e8442b | 384 | } while (count > 0 && n == size); |
fbedadc1 EVH |
385 | |
386 | if (n < 0) | |
387 | total = n; | |
388 | ||
389 | return total; | |
390 | } | |
391 | ||
17311779 AK |
392 | /** |
393 | * v9fs_file_readn - read from a file | |
394 | * @filp: file pointer to read | |
395 | * @data: data buffer to read data into | |
396 | * @udata: user data buffer to read data into | |
397 | * @count: size of buffer | |
398 | * @offset: offset at which to read data | |
399 | * | |
400 | */ | |
401 | ssize_t | |
402 | v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count, | |
403 | u64 offset) | |
404 | { | |
405 | return v9fs_fid_readn(filp->private_data, data, udata, count, offset); | |
406 | } | |
407 | ||
fbedadc1 EVH |
408 | /** |
409 | * v9fs_file_read - read from a file | |
410 | * @filp: file pointer to read | |
411 | * @udata: user data buffer to read data into | |
412 | * @count: size of buffer | |
413 | * @offset: offset at which to read data | |
414 | * | |
415 | */ | |
416 | ||
e69e7fe5 | 417 | static ssize_t |
fbedadc1 | 418 | v9fs_file_read(struct file *filp, char __user *udata, size_t count, |
19cba8ab | 419 | loff_t * offset) |
e69e7fe5 | 420 | { |
bd238fb4 LI |
421 | int ret; |
422 | struct p9_fid *fid; | |
97e8442b | 423 | size_t size; |
e69e7fe5 | 424 | |
ea2e7996 | 425 | P9_DPRINTK(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset); |
bd238fb4 | 426 | fid = filp->private_data; |
fbedadc1 | 427 | |
97e8442b MK |
428 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
429 | if (count > size) | |
fbedadc1 EVH |
430 | ret = v9fs_file_readn(filp, NULL, udata, count, *offset); |
431 | else | |
432 | ret = p9_client_read(fid, NULL, udata, *offset, count); | |
433 | ||
bd238fb4 LI |
434 | if (ret > 0) |
435 | *offset += ret; | |
e69e7fe5 | 436 | |
bd238fb4 | 437 | return ret; |
e69e7fe5 EVH |
438 | } |
439 | ||
17311779 AK |
440 | ssize_t |
441 | v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid, | |
442 | const char __user *data, size_t count, | |
443 | loff_t *offset, int invalidate) | |
e69e7fe5 | 444 | { |
8d40fa24 | 445 | int n; |
fa6ea161 | 446 | loff_t i_size; |
17311779 | 447 | size_t total = 0; |
dfb0ec2e | 448 | struct p9_client *clnt; |
fc0f2961 | 449 | loff_t origin = *offset; |
637d020a | 450 | unsigned long pg_start, pg_end; |
e69e7fe5 | 451 | |
bd238fb4 LI |
452 | P9_DPRINTK(P9_DEBUG_VFS, "data %p count %d offset %x\n", data, |
453 | (int)count, (int)*offset); | |
e69e7fe5 | 454 | |
dfb0ec2e | 455 | clnt = fid->clnt; |
dfb0ec2e | 456 | do { |
8d40fa24 | 457 | n = p9_client_write(fid, NULL, data+total, origin+total, count); |
dfb0ec2e EVH |
458 | if (n <= 0) |
459 | break; | |
460 | count -= n; | |
461 | total += n; | |
462 | } while (count > 0); | |
463 | ||
17311779 | 464 | if (invalidate && (total > 0)) { |
637d020a AK |
465 | pg_start = origin >> PAGE_CACHE_SHIFT; |
466 | pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT; | |
60e78d2c AK |
467 | if (inode->i_mapping && inode->i_mapping->nrpages) |
468 | invalidate_inode_pages2_range(inode->i_mapping, | |
469 | pg_start, pg_end); | |
dfb0ec2e | 470 | *offset += total; |
fa6ea161 AK |
471 | i_size = i_size_read(inode); |
472 | if (*offset > i_size) { | |
473 | inode_add_bytes(inode, *offset - i_size); | |
474 | i_size_write(inode, *offset); | |
475 | } | |
9523a841 | 476 | } |
dfb0ec2e | 477 | if (n < 0) |
17311779 AK |
478 | return n; |
479 | ||
480 | return total; | |
481 | } | |
482 | ||
483 | /** | |
484 | * v9fs_file_write - write to a file | |
485 | * @filp: file pointer to write | |
486 | * @data: data buffer to write data from | |
487 | * @count: size of buffer | |
488 | * @offset: offset at which to write data | |
489 | * | |
490 | */ | |
491 | static ssize_t | |
492 | v9fs_file_write(struct file *filp, const char __user * data, | |
493 | size_t count, loff_t *offset) | |
494 | { | |
495 | ssize_t retval = 0; | |
496 | loff_t origin = *offset; | |
497 | ||
498 | ||
499 | retval = generic_write_checks(filp, &origin, &count, 0); | |
500 | if (retval) | |
501 | goto out; | |
502 | ||
503 | retval = -EINVAL; | |
504 | if ((ssize_t) count < 0) | |
505 | goto out; | |
506 | retval = 0; | |
507 | if (!count) | |
508 | goto out; | |
509 | ||
510 | return v9fs_file_write_internal(filp->f_path.dentry->d_inode, | |
511 | filp->private_data, | |
512 | data, count, offset, 1); | |
3834b12a HPB |
513 | out: |
514 | return retval; | |
e69e7fe5 EVH |
515 | } |
516 | ||
7263cebe | 517 | |
7ea80859 | 518 | static int v9fs_file_fsync(struct file *filp, int datasync) |
7a4439c4 MK |
519 | { |
520 | struct p9_fid *fid; | |
521 | struct p9_wstat wstat; | |
522 | int retval; | |
523 | ||
7ea80859 | 524 | P9_DPRINTK(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
7a4439c4 MK |
525 | |
526 | fid = filp->private_data; | |
527 | v9fs_blank_wstat(&wstat); | |
528 | ||
529 | retval = p9_client_wstat(fid, &wstat); | |
530 | return retval; | |
531 | } | |
532 | ||
b165d601 | 533 | int v9fs_file_fsync_dotl(struct file *filp, int datasync) |
920e65dc VJJ |
534 | { |
535 | struct p9_fid *fid; | |
536 | int retval; | |
537 | ||
538 | P9_DPRINTK(P9_DEBUG_VFS, "v9fs_file_fsync_dotl: filp %p datasync %x\n", | |
539 | filp, datasync); | |
540 | ||
541 | fid = filp->private_data; | |
542 | ||
b165d601 | 543 | retval = p9_client_fsync(fid, datasync); |
920e65dc VJJ |
544 | return retval; |
545 | } | |
546 | ||
7263cebe AK |
547 | static int |
548 | v9fs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
549 | { | |
550 | int retval; | |
551 | ||
552 | retval = generic_file_mmap(file, vma); | |
553 | if (!retval) | |
554 | vma->vm_ops = &v9fs_file_vm_ops; | |
555 | ||
556 | return retval; | |
557 | } | |
558 | ||
559 | static int | |
560 | v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
561 | { | |
6b39f6d2 | 562 | struct v9fs_inode *v9inode; |
7263cebe AK |
563 | struct page *page = vmf->page; |
564 | struct file *filp = vma->vm_file; | |
565 | struct inode *inode = filp->f_path.dentry->d_inode; | |
566 | ||
567 | ||
568 | P9_DPRINTK(P9_DEBUG_VFS, "page %p fid %lx\n", | |
569 | page, (unsigned long)filp->private_data); | |
570 | ||
6b39f6d2 | 571 | v9inode = V9FS_I(inode); |
7263cebe AK |
572 | /* make sure the cache has finished storing the page */ |
573 | v9fs_fscache_wait_on_page_write(inode, page); | |
6b39f6d2 | 574 | BUG_ON(!v9inode->writeback_fid); |
7263cebe AK |
575 | lock_page(page); |
576 | if (page->mapping != inode->i_mapping) | |
577 | goto out_unlock; | |
578 | ||
579 | return VM_FAULT_LOCKED; | |
580 | out_unlock: | |
581 | unlock_page(page); | |
582 | return VM_FAULT_NOPAGE; | |
583 | } | |
584 | ||
e959b549 AK |
585 | static ssize_t |
586 | v9fs_direct_read(struct file *filp, char __user *udata, size_t count, | |
587 | loff_t *offsetp) | |
588 | { | |
589 | loff_t size, offset; | |
590 | struct inode *inode; | |
591 | struct address_space *mapping; | |
592 | ||
593 | offset = *offsetp; | |
594 | mapping = filp->f_mapping; | |
595 | inode = mapping->host; | |
596 | if (!count) | |
597 | return 0; | |
598 | size = i_size_read(inode); | |
599 | if (offset < size) | |
600 | filemap_write_and_wait_range(mapping, offset, | |
601 | offset + count - 1); | |
602 | ||
603 | return v9fs_file_read(filp, udata, count, offsetp); | |
604 | } | |
605 | ||
606 | /** | |
607 | * v9fs_cached_file_read - read from a file | |
608 | * @filp: file pointer to read | |
609 | * @udata: user data buffer to read data into | |
610 | * @count: size of buffer | |
611 | * @offset: offset at which to read data | |
612 | * | |
613 | */ | |
614 | static ssize_t | |
615 | v9fs_cached_file_read(struct file *filp, char __user *data, size_t count, | |
616 | loff_t *offset) | |
617 | { | |
618 | if (filp->f_flags & O_DIRECT) | |
619 | return v9fs_direct_read(filp, data, count, offset); | |
620 | return do_sync_read(filp, data, count, offset); | |
621 | } | |
622 | ||
623 | static ssize_t | |
624 | v9fs_direct_write(struct file *filp, const char __user * data, | |
625 | size_t count, loff_t *offsetp) | |
626 | { | |
627 | loff_t offset; | |
628 | ssize_t retval; | |
629 | struct inode *inode; | |
630 | struct address_space *mapping; | |
631 | ||
632 | offset = *offsetp; | |
633 | mapping = filp->f_mapping; | |
634 | inode = mapping->host; | |
635 | if (!count) | |
636 | return 0; | |
637 | ||
638 | mutex_lock(&inode->i_mutex); | |
639 | retval = filemap_write_and_wait_range(mapping, offset, | |
640 | offset + count - 1); | |
641 | if (retval) | |
642 | goto err_out; | |
643 | /* | |
644 | * After a write we want buffered reads to be sure to go to disk to get | |
645 | * the new data. We invalidate clean cached page from the region we're | |
646 | * about to write. We do this *before* the write so that if we fail | |
647 | * here we fall back to buffered write | |
648 | */ | |
649 | if (mapping->nrpages) { | |
650 | pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT; | |
651 | pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT; | |
652 | ||
653 | retval = invalidate_inode_pages2_range(mapping, | |
654 | pg_start, pg_end); | |
655 | /* | |
656 | * If a page can not be invalidated, fall back | |
657 | * to buffered write. | |
658 | */ | |
659 | if (retval) { | |
660 | if (retval == -EBUSY) | |
661 | goto buff_write; | |
662 | goto err_out; | |
663 | } | |
664 | } | |
665 | retval = v9fs_file_write(filp, data, count, offsetp); | |
666 | err_out: | |
667 | mutex_unlock(&inode->i_mutex); | |
668 | return retval; | |
669 | ||
670 | buff_write: | |
671 | mutex_unlock(&inode->i_mutex); | |
672 | return do_sync_write(filp, data, count, offsetp); | |
673 | } | |
674 | ||
675 | /** | |
676 | * v9fs_cached_file_write - write to a file | |
677 | * @filp: file pointer to write | |
678 | * @data: data buffer to write data from | |
679 | * @count: size of buffer | |
680 | * @offset: offset at which to write data | |
681 | * | |
682 | */ | |
683 | static ssize_t | |
684 | v9fs_cached_file_write(struct file *filp, const char __user * data, | |
685 | size_t count, loff_t *offset) | |
686 | { | |
687 | ||
688 | if (filp->f_flags & O_DIRECT) | |
689 | return v9fs_direct_write(filp, data, count, offset); | |
690 | return do_sync_write(filp, data, count, offset); | |
691 | } | |
692 | ||
7263cebe AK |
693 | static const struct vm_operations_struct v9fs_file_vm_ops = { |
694 | .fault = filemap_fault, | |
695 | .page_mkwrite = v9fs_vm_page_mkwrite, | |
696 | }; | |
697 | ||
e959b549 | 698 | |
29236f4e | 699 | const struct file_operations v9fs_cached_file_operations = { |
e03abc0c | 700 | .llseek = generic_file_llseek, |
e959b549 AK |
701 | .read = v9fs_cached_file_read, |
702 | .write = v9fs_cached_file_write, | |
e03abc0c | 703 | .aio_read = generic_file_aio_read, |
7263cebe | 704 | .aio_write = generic_file_aio_write, |
e03abc0c EVH |
705 | .open = v9fs_file_open, |
706 | .release = v9fs_dir_release, | |
707 | .lock = v9fs_file_lock, | |
7263cebe | 708 | .mmap = v9fs_file_mmap, |
7a4439c4 | 709 | .fsync = v9fs_file_fsync, |
e03abc0c EVH |
710 | }; |
711 | ||
29236f4e | 712 | const struct file_operations v9fs_cached_file_operations_dotl = { |
b04faaf3 | 713 | .llseek = generic_file_llseek, |
e959b549 AK |
714 | .read = v9fs_cached_file_read, |
715 | .write = v9fs_cached_file_write, | |
b04faaf3 | 716 | .aio_read = generic_file_aio_read, |
7263cebe | 717 | .aio_write = generic_file_aio_write, |
b04faaf3 VJJ |
718 | .open = v9fs_file_open, |
719 | .release = v9fs_dir_release, | |
a099027c MK |
720 | .lock = v9fs_file_lock_dotl, |
721 | .flock = v9fs_file_flock_dotl, | |
7263cebe | 722 | .mmap = v9fs_file_mmap, |
920e65dc | 723 | .fsync = v9fs_file_fsync_dotl, |
b04faaf3 VJJ |
724 | }; |
725 | ||
4b6f5d20 | 726 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 EVH |
727 | .llseek = generic_file_llseek, |
728 | .read = v9fs_file_read, | |
729 | .write = v9fs_file_write, | |
730 | .open = v9fs_file_open, | |
731 | .release = v9fs_dir_release, | |
732 | .lock = v9fs_file_lock, | |
14b8869f | 733 | .mmap = generic_file_readonly_mmap, |
7a4439c4 | 734 | .fsync = v9fs_file_fsync, |
e69e7fe5 | 735 | }; |
9b6533c9 SK |
736 | |
737 | const struct file_operations v9fs_file_operations_dotl = { | |
738 | .llseek = generic_file_llseek, | |
739 | .read = v9fs_file_read, | |
740 | .write = v9fs_file_write, | |
741 | .open = v9fs_file_open, | |
742 | .release = v9fs_dir_release, | |
a099027c MK |
743 | .lock = v9fs_file_lock_dotl, |
744 | .flock = v9fs_file_flock_dotl, | |
9b6533c9 | 745 | .mmap = generic_file_readonly_mmap, |
920e65dc | 746 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 747 | }; |