Commit | Line | Data |
---|---|---|
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 | |
5d385153 | 64 | p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file); |
6b39f6d2 | 65 | v9inode = V9FS_I(inode); |
bd238fb4 | 66 | v9ses = v9fs_inode2v9ses(inode); |
ef56547e | 67 | if (v9fs_proto_dotl(v9ses)) |
f88657ce | 68 | omode = v9fs_open_to_dotl_flags(file->f_flags); |
ef56547e MK |
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 MK |
83 | if ((file->f_flags & O_APPEND) && |
84 | (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) | |
2e4bef41 | 85 | generic_file_llseek(file, 0, SEEK_END); |
6a3124a3 | 86 | } |
e69e7fe5 | 87 | |
bd238fb4 | 88 | file->private_data = fid; |
5a7e0a8c | 89 | mutex_lock(&v9inode->v_mutex); |
7add697a AK |
90 | if (v9ses->cache && !v9inode->writeback_fid && |
91 | ((file->f_flags & O_ACCMODE) != O_RDONLY)) { | |
3cf387d7 | 92 | /* |
6b39f6d2 | 93 | * clone a fid and add it to writeback_fid |
3cf387d7 AK |
94 | * we do it during open time instead of |
95 | * page dirty time via write_begin/page_mkwrite | |
96 | * because we want write after unlink usecase | |
97 | * to work. | |
98 | */ | |
99 | fid = v9fs_writeback_fid(file->f_path.dentry); | |
100 | if (IS_ERR(fid)) { | |
101 | err = PTR_ERR(fid); | |
5a7e0a8c | 102 | mutex_unlock(&v9inode->v_mutex); |
3cf387d7 AK |
103 | goto out_error; |
104 | } | |
6b39f6d2 | 105 | v9inode->writeback_fid = (void *) fid; |
3cf387d7 | 106 | } |
5a7e0a8c | 107 | mutex_unlock(&v9inode->v_mutex); |
29236f4e | 108 | #ifdef CONFIG_9P_FSCACHE |
46848de0 | 109 | if (v9ses->cache) |
60e78d2c | 110 | v9fs_cache_inode_set_cookie(inode, file); |
29236f4e | 111 | #endif |
6a3124a3 | 112 | return 0; |
3cf387d7 AK |
113 | out_error: |
114 | p9_client_clunk(file->private_data); | |
115 | file->private_data = NULL; | |
116 | return err; | |
e69e7fe5 EVH |
117 | } |
118 | ||
119 | /** | |
120 | * v9fs_file_lock - lock a file (or directory) | |
ee443996 EVH |
121 | * @filp: file to be locked |
122 | * @cmd: lock command | |
123 | * @fl: file lock structure | |
e69e7fe5 | 124 | * |
ee443996 | 125 | * Bugs: this looks like a local only lock, we should extend into 9P |
e69e7fe5 EVH |
126 | * by using open exclusive |
127 | */ | |
128 | ||
129 | static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) | |
130 | { | |
131 | int res = 0; | |
496ad9aa | 132 | struct inode *inode = file_inode(filp); |
e69e7fe5 | 133 | |
5d385153 | 134 | p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); |
e69e7fe5 EVH |
135 | |
136 | /* No mandatory locks */ | |
f78233dd | 137 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) |
e69e7fe5 EVH |
138 | return -ENOLCK; |
139 | ||
140 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
28fd1298 | 141 | filemap_write_and_wait(inode->i_mapping); |
fc0ecff6 | 142 | invalidate_mapping_pages(&inode->i_data, 0, -1); |
e69e7fe5 EVH |
143 | } |
144 | ||
145 | return res; | |
146 | } | |
147 | ||
a099027c MK |
148 | static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) |
149 | { | |
150 | struct p9_flock flock; | |
151 | struct p9_fid *fid; | |
152 | uint8_t status; | |
153 | int res = 0; | |
154 | unsigned char fl_type; | |
155 | ||
156 | fid = filp->private_data; | |
157 | BUG_ON(fid == NULL); | |
158 | ||
159 | if ((fl->fl_flags & FL_POSIX) != FL_POSIX) | |
160 | BUG(); | |
161 | ||
162 | res = posix_lock_file_wait(filp, fl); | |
163 | if (res < 0) | |
164 | goto out; | |
165 | ||
166 | /* convert posix lock to p9 tlock args */ | |
167 | memset(&flock, 0, sizeof(flock)); | |
51b8b4fb JG |
168 | /* map the lock type */ |
169 | switch (fl->fl_type) { | |
170 | case F_RDLCK: | |
171 | flock.type = P9_LOCK_TYPE_RDLCK; | |
172 | break; | |
173 | case F_WRLCK: | |
174 | flock.type = P9_LOCK_TYPE_WRLCK; | |
175 | break; | |
176 | case F_UNLCK: | |
177 | flock.type = P9_LOCK_TYPE_UNLCK; | |
178 | break; | |
179 | } | |
a099027c MK |
180 | flock.start = fl->fl_start; |
181 | if (fl->fl_end == OFFSET_MAX) | |
182 | flock.length = 0; | |
183 | else | |
184 | flock.length = fl->fl_end - fl->fl_start + 1; | |
185 | flock.proc_id = fl->fl_pid; | |
50192abe | 186 | flock.client_id = fid->clnt->name; |
a099027c MK |
187 | if (IS_SETLKW(cmd)) |
188 | flock.flags = P9_LOCK_FLAGS_BLOCK; | |
189 | ||
190 | /* | |
191 | * if its a blocked request and we get P9_LOCK_BLOCKED as the status | |
192 | * for lock request, keep on trying | |
193 | */ | |
194 | for (;;) { | |
195 | res = p9_client_lock_dotl(fid, &flock, &status); | |
196 | if (res < 0) | |
197 | break; | |
198 | ||
199 | if (status != P9_LOCK_BLOCKED) | |
200 | break; | |
201 | if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd)) | |
202 | break; | |
a0ea787b JG |
203 | if (schedule_timeout_interruptible(P9_LOCK_TIMEOUT) != 0) |
204 | break; | |
a099027c MK |
205 | } |
206 | ||
207 | /* map 9p status to VFS status */ | |
208 | switch (status) { | |
209 | case P9_LOCK_SUCCESS: | |
210 | res = 0; | |
211 | break; | |
212 | case P9_LOCK_BLOCKED: | |
213 | res = -EAGAIN; | |
214 | break; | |
215 | case P9_LOCK_ERROR: | |
216 | case P9_LOCK_GRACE: | |
217 | res = -ENOLCK; | |
218 | break; | |
219 | default: | |
220 | BUG(); | |
221 | } | |
222 | ||
223 | /* | |
224 | * incase server returned error for lock request, revert | |
225 | * it locally | |
226 | */ | |
227 | if (res < 0 && fl->fl_type != F_UNLCK) { | |
228 | fl_type = fl->fl_type; | |
229 | fl->fl_type = F_UNLCK; | |
230 | res = posix_lock_file_wait(filp, fl); | |
231 | fl->fl_type = fl_type; | |
232 | } | |
233 | out: | |
234 | return res; | |
235 | } | |
236 | ||
1d769cd1 MK |
237 | static int v9fs_file_getlock(struct file *filp, struct file_lock *fl) |
238 | { | |
239 | struct p9_getlock glock; | |
240 | struct p9_fid *fid; | |
241 | int res = 0; | |
242 | ||
243 | fid = filp->private_data; | |
244 | BUG_ON(fid == NULL); | |
245 | ||
246 | posix_test_lock(filp, fl); | |
247 | /* | |
248 | * if we have a conflicting lock locally, no need to validate | |
249 | * with server | |
250 | */ | |
251 | if (fl->fl_type != F_UNLCK) | |
252 | return res; | |
253 | ||
254 | /* convert posix lock to p9 tgetlock args */ | |
255 | memset(&glock, 0, sizeof(glock)); | |
51b8b4fb | 256 | glock.type = P9_LOCK_TYPE_UNLCK; |
1d769cd1 MK |
257 | glock.start = fl->fl_start; |
258 | if (fl->fl_end == OFFSET_MAX) | |
259 | glock.length = 0; | |
260 | else | |
261 | glock.length = fl->fl_end - fl->fl_start + 1; | |
262 | glock.proc_id = fl->fl_pid; | |
50192abe | 263 | glock.client_id = fid->clnt->name; |
1d769cd1 MK |
264 | |
265 | res = p9_client_getlock_dotl(fid, &glock); | |
266 | if (res < 0) | |
267 | return res; | |
51b8b4fb JG |
268 | /* map 9p lock type to os lock type */ |
269 | switch (glock.type) { | |
270 | case P9_LOCK_TYPE_RDLCK: | |
271 | fl->fl_type = F_RDLCK; | |
272 | break; | |
273 | case P9_LOCK_TYPE_WRLCK: | |
274 | fl->fl_type = F_WRLCK; | |
275 | break; | |
276 | case P9_LOCK_TYPE_UNLCK: | |
277 | fl->fl_type = F_UNLCK; | |
278 | break; | |
279 | } | |
280 | if (glock.type != P9_LOCK_TYPE_UNLCK) { | |
1d769cd1 MK |
281 | fl->fl_start = glock.start; |
282 | if (glock.length == 0) | |
283 | fl->fl_end = OFFSET_MAX; | |
284 | else | |
285 | fl->fl_end = glock.start + glock.length - 1; | |
286 | fl->fl_pid = glock.proc_id; | |
51b8b4fb | 287 | } |
1d769cd1 MK |
288 | return res; |
289 | } | |
290 | ||
a099027c MK |
291 | /** |
292 | * v9fs_file_lock_dotl - lock a file (or directory) | |
293 | * @filp: file to be locked | |
294 | * @cmd: lock command | |
295 | * @fl: file lock structure | |
296 | * | |
297 | */ | |
298 | ||
299 | static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl) | |
300 | { | |
496ad9aa | 301 | struct inode *inode = file_inode(filp); |
a099027c MK |
302 | int ret = -ENOLCK; |
303 | ||
5d385153 JP |
304 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", |
305 | filp, cmd, fl, filp->f_path.dentry->d_name.name); | |
a099027c MK |
306 | |
307 | /* No mandatory locks */ | |
308 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
309 | goto out_err; | |
310 | ||
311 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
312 | filemap_write_and_wait(inode->i_mapping); | |
313 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
314 | } | |
315 | ||
316 | if (IS_SETLK(cmd) || IS_SETLKW(cmd)) | |
317 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
1d769cd1 MK |
318 | else if (IS_GETLK(cmd)) |
319 | ret = v9fs_file_getlock(filp, fl); | |
a099027c MK |
320 | else |
321 | ret = -EINVAL; | |
322 | out_err: | |
323 | return ret; | |
324 | } | |
325 | ||
326 | /** | |
327 | * v9fs_file_flock_dotl - lock a file | |
328 | * @filp: file to be locked | |
329 | * @cmd: lock command | |
330 | * @fl: file lock structure | |
331 | * | |
332 | */ | |
333 | ||
334 | static int v9fs_file_flock_dotl(struct file *filp, int cmd, | |
335 | struct file_lock *fl) | |
336 | { | |
496ad9aa | 337 | struct inode *inode = file_inode(filp); |
a099027c MK |
338 | int ret = -ENOLCK; |
339 | ||
5d385153 JP |
340 | p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %s\n", |
341 | filp, cmd, fl, filp->f_path.dentry->d_name.name); | |
a099027c MK |
342 | |
343 | /* No mandatory locks */ | |
344 | if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) | |
345 | goto out_err; | |
346 | ||
347 | if (!(fl->fl_flags & FL_FLOCK)) | |
348 | goto out_err; | |
349 | ||
350 | if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { | |
351 | filemap_write_and_wait(inode->i_mapping); | |
352 | invalidate_mapping_pages(&inode->i_data, 0, -1); | |
353 | } | |
354 | /* Convert flock to posix lock */ | |
355 | fl->fl_owner = (fl_owner_t)filp; | |
356 | fl->fl_start = 0; | |
357 | fl->fl_end = OFFSET_MAX; | |
358 | fl->fl_flags |= FL_POSIX; | |
359 | fl->fl_flags ^= FL_FLOCK; | |
360 | ||
361 | if (IS_SETLK(cmd) | IS_SETLKW(cmd)) | |
362 | ret = v9fs_file_do_lock(filp, cmd, fl); | |
363 | else | |
364 | ret = -EINVAL; | |
365 | out_err: | |
366 | return ret; | |
367 | } | |
368 | ||
e69e7fe5 | 369 | /** |
17311779 AK |
370 | * v9fs_fid_readn - read from a fid |
371 | * @fid: fid to read | |
e69e7fe5 | 372 | * @data: data buffer to read data into |
fbedadc1 | 373 | * @udata: user data buffer to read data into |
e69e7fe5 EVH |
374 | * @count: size of buffer |
375 | * @offset: offset at which to read data | |
376 | * | |
377 | */ | |
fbedadc1 | 378 | ssize_t |
17311779 | 379 | v9fs_fid_readn(struct p9_fid *fid, char *data, char __user *udata, u32 count, |
fbedadc1 EVH |
380 | u64 offset) |
381 | { | |
97e8442b | 382 | int n, total, size; |
fbedadc1 | 383 | |
5d385153 JP |
384 | p9_debug(P9_DEBUG_VFS, "fid %d offset %llu count %d\n", |
385 | fid->fid, (long long unsigned)offset, count); | |
fbedadc1 EVH |
386 | n = 0; |
387 | total = 0; | |
97e8442b | 388 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
fbedadc1 EVH |
389 | do { |
390 | n = p9_client_read(fid, data, udata, offset, count); | |
391 | if (n <= 0) | |
392 | break; | |
393 | ||
394 | if (data) | |
395 | data += n; | |
396 | if (udata) | |
397 | udata += n; | |
398 | ||
399 | offset += n; | |
400 | count -= n; | |
401 | total += n; | |
97e8442b | 402 | } while (count > 0 && n == size); |
fbedadc1 EVH |
403 | |
404 | if (n < 0) | |
405 | total = n; | |
406 | ||
407 | return total; | |
408 | } | |
409 | ||
17311779 AK |
410 | /** |
411 | * v9fs_file_readn - read from a file | |
412 | * @filp: file pointer to read | |
413 | * @data: data buffer to read data into | |
414 | * @udata: user data buffer to read data into | |
415 | * @count: size of buffer | |
416 | * @offset: offset at which to read data | |
417 | * | |
418 | */ | |
419 | ssize_t | |
420 | v9fs_file_readn(struct file *filp, char *data, char __user *udata, u32 count, | |
421 | u64 offset) | |
422 | { | |
423 | return v9fs_fid_readn(filp->private_data, data, udata, count, offset); | |
424 | } | |
425 | ||
fbedadc1 EVH |
426 | /** |
427 | * v9fs_file_read - read from a file | |
428 | * @filp: file pointer to read | |
429 | * @udata: user data buffer to read data into | |
430 | * @count: size of buffer | |
431 | * @offset: offset at which to read data | |
432 | * | |
433 | */ | |
434 | ||
e69e7fe5 | 435 | static ssize_t |
fbedadc1 | 436 | v9fs_file_read(struct file *filp, char __user *udata, size_t count, |
19cba8ab | 437 | loff_t * offset) |
e69e7fe5 | 438 | { |
bd238fb4 LI |
439 | int ret; |
440 | struct p9_fid *fid; | |
97e8442b | 441 | size_t size; |
e69e7fe5 | 442 | |
5d385153 | 443 | p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", count, *offset); |
bd238fb4 | 444 | fid = filp->private_data; |
fbedadc1 | 445 | |
97e8442b MK |
446 | size = fid->iounit ? fid->iounit : fid->clnt->msize - P9_IOHDRSZ; |
447 | if (count > size) | |
fbedadc1 EVH |
448 | ret = v9fs_file_readn(filp, NULL, udata, count, *offset); |
449 | else | |
450 | ret = p9_client_read(fid, NULL, udata, *offset, count); | |
451 | ||
bd238fb4 LI |
452 | if (ret > 0) |
453 | *offset += ret; | |
e69e7fe5 | 454 | |
bd238fb4 | 455 | return ret; |
e69e7fe5 EVH |
456 | } |
457 | ||
17311779 AK |
458 | ssize_t |
459 | v9fs_file_write_internal(struct inode *inode, struct p9_fid *fid, | |
460 | const char __user *data, size_t count, | |
461 | loff_t *offset, int invalidate) | |
e69e7fe5 | 462 | { |
8d40fa24 | 463 | int n; |
fa6ea161 | 464 | loff_t i_size; |
17311779 | 465 | size_t total = 0; |
dfb0ec2e | 466 | struct p9_client *clnt; |
fc0f2961 | 467 | loff_t origin = *offset; |
637d020a | 468 | unsigned long pg_start, pg_end; |
e69e7fe5 | 469 | |
5d385153 JP |
470 | p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n", |
471 | data, (int)count, (int)*offset); | |
e69e7fe5 | 472 | |
dfb0ec2e | 473 | clnt = fid->clnt; |
dfb0ec2e | 474 | do { |
8d40fa24 | 475 | n = p9_client_write(fid, NULL, data+total, origin+total, count); |
dfb0ec2e EVH |
476 | if (n <= 0) |
477 | break; | |
478 | count -= n; | |
479 | total += n; | |
480 | } while (count > 0); | |
481 | ||
17311779 | 482 | if (invalidate && (total > 0)) { |
637d020a AK |
483 | pg_start = origin >> PAGE_CACHE_SHIFT; |
484 | pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT; | |
60e78d2c AK |
485 | if (inode->i_mapping && inode->i_mapping->nrpages) |
486 | invalidate_inode_pages2_range(inode->i_mapping, | |
487 | pg_start, pg_end); | |
dfb0ec2e | 488 | *offset += total; |
fa6ea161 AK |
489 | i_size = i_size_read(inode); |
490 | if (*offset > i_size) { | |
491 | inode_add_bytes(inode, *offset - i_size); | |
492 | i_size_write(inode, *offset); | |
493 | } | |
9523a841 | 494 | } |
dfb0ec2e | 495 | if (n < 0) |
17311779 AK |
496 | return n; |
497 | ||
498 | return total; | |
499 | } | |
500 | ||
501 | /** | |
502 | * v9fs_file_write - write to a file | |
503 | * @filp: file pointer to write | |
504 | * @data: data buffer to write data from | |
505 | * @count: size of buffer | |
506 | * @offset: offset at which to write data | |
507 | * | |
508 | */ | |
509 | static ssize_t | |
510 | v9fs_file_write(struct file *filp, const char __user * data, | |
511 | size_t count, loff_t *offset) | |
512 | { | |
513 | ssize_t retval = 0; | |
514 | loff_t origin = *offset; | |
515 | ||
516 | ||
517 | retval = generic_write_checks(filp, &origin, &count, 0); | |
518 | if (retval) | |
519 | goto out; | |
520 | ||
521 | retval = -EINVAL; | |
522 | if ((ssize_t) count < 0) | |
523 | goto out; | |
524 | retval = 0; | |
525 | if (!count) | |
526 | goto out; | |
527 | ||
496ad9aa | 528 | retval = v9fs_file_write_internal(file_inode(filp), |
17311779 | 529 | filp->private_data, |
aaf0ef1d MK |
530 | data, count, &origin, 1); |
531 | /* update offset on successful write */ | |
532 | if (retval > 0) | |
533 | *offset = origin; | |
3834b12a HPB |
534 | out: |
535 | return retval; | |
e69e7fe5 EVH |
536 | } |
537 | ||
7263cebe | 538 | |
02c24a82 JB |
539 | static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end, |
540 | int datasync) | |
7a4439c4 MK |
541 | { |
542 | struct p9_fid *fid; | |
02c24a82 | 543 | struct inode *inode = filp->f_mapping->host; |
7a4439c4 MK |
544 | struct p9_wstat wstat; |
545 | int retval; | |
546 | ||
02c24a82 JB |
547 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
548 | if (retval) | |
549 | return retval; | |
550 | ||
551 | mutex_lock(&inode->i_mutex); | |
5d385153 | 552 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
7a4439c4 MK |
553 | |
554 | fid = filp->private_data; | |
555 | v9fs_blank_wstat(&wstat); | |
556 | ||
557 | retval = p9_client_wstat(fid, &wstat); | |
02c24a82 JB |
558 | mutex_unlock(&inode->i_mutex); |
559 | ||
7a4439c4 MK |
560 | return retval; |
561 | } | |
562 | ||
02c24a82 JB |
563 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
564 | int datasync) | |
920e65dc VJJ |
565 | { |
566 | struct p9_fid *fid; | |
02c24a82 | 567 | struct inode *inode = filp->f_mapping->host; |
920e65dc VJJ |
568 | int retval; |
569 | ||
02c24a82 JB |
570 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
571 | if (retval) | |
572 | return retval; | |
573 | ||
574 | mutex_lock(&inode->i_mutex); | |
5d385153 | 575 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
920e65dc VJJ |
576 | |
577 | fid = filp->private_data; | |
578 | ||
b165d601 | 579 | retval = p9_client_fsync(fid, datasync); |
02c24a82 JB |
580 | mutex_unlock(&inode->i_mutex); |
581 | ||
920e65dc VJJ |
582 | return retval; |
583 | } | |
584 | ||
7263cebe AK |
585 | static int |
586 | v9fs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
587 | { | |
588 | int retval; | |
589 | ||
590 | retval = generic_file_mmap(file, vma); | |
591 | if (!retval) | |
592 | vma->vm_ops = &v9fs_file_vm_ops; | |
593 | ||
594 | return retval; | |
595 | } | |
596 | ||
597 | static int | |
598 | v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
599 | { | |
6b39f6d2 | 600 | struct v9fs_inode *v9inode; |
7263cebe AK |
601 | struct page *page = vmf->page; |
602 | struct file *filp = vma->vm_file; | |
496ad9aa | 603 | struct inode *inode = file_inode(filp); |
7263cebe AK |
604 | |
605 | ||
5d385153 JP |
606 | p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n", |
607 | page, (unsigned long)filp->private_data); | |
7263cebe | 608 | |
120c2bca JK |
609 | /* Update file times before taking page lock */ |
610 | file_update_time(filp); | |
611 | ||
6b39f6d2 | 612 | v9inode = V9FS_I(inode); |
7263cebe AK |
613 | /* make sure the cache has finished storing the page */ |
614 | v9fs_fscache_wait_on_page_write(inode, page); | |
6b39f6d2 | 615 | BUG_ON(!v9inode->writeback_fid); |
7263cebe AK |
616 | lock_page(page); |
617 | if (page->mapping != inode->i_mapping) | |
618 | goto out_unlock; | |
13575ca1 | 619 | wait_for_stable_page(page); |
7263cebe AK |
620 | |
621 | return VM_FAULT_LOCKED; | |
622 | out_unlock: | |
623 | unlock_page(page); | |
624 | return VM_FAULT_NOPAGE; | |
625 | } | |
626 | ||
e959b549 AK |
627 | static ssize_t |
628 | v9fs_direct_read(struct file *filp, char __user *udata, size_t count, | |
629 | loff_t *offsetp) | |
630 | { | |
631 | loff_t size, offset; | |
632 | struct inode *inode; | |
633 | struct address_space *mapping; | |
634 | ||
635 | offset = *offsetp; | |
636 | mapping = filp->f_mapping; | |
637 | inode = mapping->host; | |
638 | if (!count) | |
639 | return 0; | |
640 | size = i_size_read(inode); | |
641 | if (offset < size) | |
642 | filemap_write_and_wait_range(mapping, offset, | |
643 | offset + count - 1); | |
644 | ||
645 | return v9fs_file_read(filp, udata, count, offsetp); | |
646 | } | |
647 | ||
648 | /** | |
649 | * v9fs_cached_file_read - read from a file | |
650 | * @filp: file pointer to read | |
651 | * @udata: user data buffer to read data into | |
652 | * @count: size of buffer | |
653 | * @offset: offset at which to read data | |
654 | * | |
655 | */ | |
656 | static ssize_t | |
657 | v9fs_cached_file_read(struct file *filp, char __user *data, size_t count, | |
658 | loff_t *offset) | |
659 | { | |
660 | if (filp->f_flags & O_DIRECT) | |
661 | return v9fs_direct_read(filp, data, count, offset); | |
662 | return do_sync_read(filp, data, count, offset); | |
663 | } | |
664 | ||
665 | static ssize_t | |
666 | v9fs_direct_write(struct file *filp, const char __user * data, | |
667 | size_t count, loff_t *offsetp) | |
668 | { | |
669 | loff_t offset; | |
670 | ssize_t retval; | |
671 | struct inode *inode; | |
672 | struct address_space *mapping; | |
673 | ||
674 | offset = *offsetp; | |
675 | mapping = filp->f_mapping; | |
676 | inode = mapping->host; | |
677 | if (!count) | |
678 | return 0; | |
679 | ||
680 | mutex_lock(&inode->i_mutex); | |
681 | retval = filemap_write_and_wait_range(mapping, offset, | |
682 | offset + count - 1); | |
683 | if (retval) | |
684 | goto err_out; | |
685 | /* | |
686 | * After a write we want buffered reads to be sure to go to disk to get | |
687 | * the new data. We invalidate clean cached page from the region we're | |
688 | * about to write. We do this *before* the write so that if we fail | |
689 | * here we fall back to buffered write | |
690 | */ | |
691 | if (mapping->nrpages) { | |
692 | pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT; | |
693 | pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT; | |
694 | ||
695 | retval = invalidate_inode_pages2_range(mapping, | |
696 | pg_start, pg_end); | |
697 | /* | |
698 | * If a page can not be invalidated, fall back | |
699 | * to buffered write. | |
700 | */ | |
701 | if (retval) { | |
702 | if (retval == -EBUSY) | |
703 | goto buff_write; | |
704 | goto err_out; | |
705 | } | |
706 | } | |
707 | retval = v9fs_file_write(filp, data, count, offsetp); | |
708 | err_out: | |
709 | mutex_unlock(&inode->i_mutex); | |
710 | return retval; | |
711 | ||
712 | buff_write: | |
713 | mutex_unlock(&inode->i_mutex); | |
714 | return do_sync_write(filp, data, count, offsetp); | |
715 | } | |
716 | ||
717 | /** | |
718 | * v9fs_cached_file_write - write to a file | |
719 | * @filp: file pointer to write | |
720 | * @data: data buffer to write data from | |
721 | * @count: size of buffer | |
722 | * @offset: offset at which to write data | |
723 | * | |
724 | */ | |
725 | static ssize_t | |
726 | v9fs_cached_file_write(struct file *filp, const char __user * data, | |
727 | size_t count, loff_t *offset) | |
728 | { | |
729 | ||
730 | if (filp->f_flags & O_DIRECT) | |
731 | return v9fs_direct_write(filp, data, count, offset); | |
732 | return do_sync_write(filp, data, count, offset); | |
733 | } | |
734 | ||
7263cebe AK |
735 | static const struct vm_operations_struct v9fs_file_vm_ops = { |
736 | .fault = filemap_fault, | |
737 | .page_mkwrite = v9fs_vm_page_mkwrite, | |
0b173bc4 | 738 | .remap_pages = generic_file_remap_pages, |
7263cebe AK |
739 | }; |
740 | ||
e959b549 | 741 | |
29236f4e | 742 | const struct file_operations v9fs_cached_file_operations = { |
e03abc0c | 743 | .llseek = generic_file_llseek, |
e959b549 AK |
744 | .read = v9fs_cached_file_read, |
745 | .write = v9fs_cached_file_write, | |
e03abc0c | 746 | .aio_read = generic_file_aio_read, |
7263cebe | 747 | .aio_write = generic_file_aio_write, |
e03abc0c EVH |
748 | .open = v9fs_file_open, |
749 | .release = v9fs_dir_release, | |
750 | .lock = v9fs_file_lock, | |
7263cebe | 751 | .mmap = v9fs_file_mmap, |
7a4439c4 | 752 | .fsync = v9fs_file_fsync, |
e03abc0c EVH |
753 | }; |
754 | ||
29236f4e | 755 | const struct file_operations v9fs_cached_file_operations_dotl = { |
b04faaf3 | 756 | .llseek = generic_file_llseek, |
e959b549 AK |
757 | .read = v9fs_cached_file_read, |
758 | .write = v9fs_cached_file_write, | |
b04faaf3 | 759 | .aio_read = generic_file_aio_read, |
7263cebe | 760 | .aio_write = generic_file_aio_write, |
b04faaf3 VJJ |
761 | .open = v9fs_file_open, |
762 | .release = v9fs_dir_release, | |
a099027c MK |
763 | .lock = v9fs_file_lock_dotl, |
764 | .flock = v9fs_file_flock_dotl, | |
7263cebe | 765 | .mmap = v9fs_file_mmap, |
920e65dc | 766 | .fsync = v9fs_file_fsync_dotl, |
b04faaf3 VJJ |
767 | }; |
768 | ||
4b6f5d20 | 769 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 EVH |
770 | .llseek = generic_file_llseek, |
771 | .read = v9fs_file_read, | |
772 | .write = v9fs_file_write, | |
773 | .open = v9fs_file_open, | |
774 | .release = v9fs_dir_release, | |
775 | .lock = v9fs_file_lock, | |
14b8869f | 776 | .mmap = generic_file_readonly_mmap, |
7a4439c4 | 777 | .fsync = v9fs_file_fsync, |
e69e7fe5 | 778 | }; |
9b6533c9 SK |
779 | |
780 | const struct file_operations v9fs_file_operations_dotl = { | |
781 | .llseek = generic_file_llseek, | |
782 | .read = v9fs_file_read, | |
783 | .write = v9fs_file_write, | |
784 | .open = v9fs_file_open, | |
785 | .release = v9fs_dir_release, | |
a099027c MK |
786 | .lock = v9fs_file_lock_dotl, |
787 | .flock = v9fs_file_flock_dotl, | |
9b6533c9 | 788 | .mmap = generic_file_readonly_mmap, |
920e65dc | 789 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 790 | }; |