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 | 47 | static const struct vm_operations_struct v9fs_file_vm_ops; |
fb89b45c | 48 | static const struct vm_operations_struct v9fs_mmap_file_vm_ops; |
7263cebe | 49 | |
e69e7fe5 EVH |
50 | /** |
51 | * v9fs_file_open - open a file (or directory) | |
52 | * @inode: inode to be opened | |
53 | * @file: file being opened | |
54 | * | |
55 | */ | |
56 | ||
57 | int v9fs_file_open(struct inode *inode, struct file *file) | |
58 | { | |
6a3124a3 | 59 | int err; |
6b39f6d2 | 60 | struct v9fs_inode *v9inode; |
bd238fb4 LI |
61 | struct v9fs_session_info *v9ses; |
62 | struct p9_fid *fid; | |
63 | int omode; | |
e69e7fe5 | 64 | |
5d385153 | 65 | p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file); |
6b39f6d2 | 66 | v9inode = V9FS_I(inode); |
bd238fb4 | 67 | v9ses = v9fs_inode2v9ses(inode); |
ef56547e | 68 | if (v9fs_proto_dotl(v9ses)) |
f88657ce | 69 | omode = v9fs_open_to_dotl_flags(file->f_flags); |
ef56547e MK |
70 | else |
71 | omode = v9fs_uflags2omode(file->f_flags, | |
72 | v9fs_proto_dotu(v9ses)); | |
bd238fb4 LI |
73 | fid = file->private_data; |
74 | if (!fid) { | |
75 | fid = v9fs_fid_clone(file->f_path.dentry); | |
76 | if (IS_ERR(fid)) | |
77 | return PTR_ERR(fid); | |
78 | ||
79 | err = p9_client_open(fid, omode); | |
9523a841 | 80 | if (err < 0) { |
bd238fb4 LI |
81 | p9_client_clunk(fid); |
82 | return err; | |
83 | } | |
ef56547e MK |
84 | if ((file->f_flags & O_APPEND) && |
85 | (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) | |
2e4bef41 | 86 | generic_file_llseek(file, 0, SEEK_END); |
6a3124a3 | 87 | } |
e69e7fe5 | 88 | |
bd238fb4 | 89 | file->private_data = fid; |
5a7e0a8c | 90 | mutex_lock(&v9inode->v_mutex); |
fb89b45c DM |
91 | if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && |
92 | !v9inode->writeback_fid && | |
7add697a | 93 | ((file->f_flags & O_ACCMODE) != O_RDONLY)) { |
3cf387d7 | 94 | /* |
6b39f6d2 | 95 | * clone a fid and add it to writeback_fid |
3cf387d7 AK |
96 | * we do it during open time instead of |
97 | * page dirty time via write_begin/page_mkwrite | |
98 | * because we want write after unlink usecase | |
99 | * to work. | |
100 | */ | |
101 | fid = v9fs_writeback_fid(file->f_path.dentry); | |
102 | if (IS_ERR(fid)) { | |
103 | err = PTR_ERR(fid); | |
5a7e0a8c | 104 | mutex_unlock(&v9inode->v_mutex); |
3cf387d7 AK |
105 | goto out_error; |
106 | } | |
6b39f6d2 | 107 | v9inode->writeback_fid = (void *) fid; |
3cf387d7 | 108 | } |
5a7e0a8c | 109 | mutex_unlock(&v9inode->v_mutex); |
fb89b45c | 110 | if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) |
60e78d2c | 111 | v9fs_cache_inode_set_cookie(inode, file); |
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; |
fc0f2961 | 466 | loff_t origin = *offset; |
637d020a | 467 | unsigned long pg_start, pg_end; |
e69e7fe5 | 468 | |
5d385153 JP |
469 | p9_debug(P9_DEBUG_VFS, "data %p count %d offset %x\n", |
470 | data, (int)count, (int)*offset); | |
e69e7fe5 | 471 | |
dfb0ec2e | 472 | do { |
8d40fa24 | 473 | n = p9_client_write(fid, NULL, data+total, origin+total, count); |
dfb0ec2e EVH |
474 | if (n <= 0) |
475 | break; | |
476 | count -= n; | |
477 | total += n; | |
478 | } while (count > 0); | |
479 | ||
17311779 | 480 | if (invalidate && (total > 0)) { |
637d020a AK |
481 | pg_start = origin >> PAGE_CACHE_SHIFT; |
482 | pg_end = (origin + total - 1) >> PAGE_CACHE_SHIFT; | |
60e78d2c AK |
483 | if (inode->i_mapping && inode->i_mapping->nrpages) |
484 | invalidate_inode_pages2_range(inode->i_mapping, | |
485 | pg_start, pg_end); | |
dfb0ec2e | 486 | *offset += total; |
fa6ea161 AK |
487 | i_size = i_size_read(inode); |
488 | if (*offset > i_size) { | |
489 | inode_add_bytes(inode, *offset - i_size); | |
490 | i_size_write(inode, *offset); | |
491 | } | |
9523a841 | 492 | } |
dfb0ec2e | 493 | if (n < 0) |
17311779 AK |
494 | return n; |
495 | ||
496 | return total; | |
497 | } | |
498 | ||
499 | /** | |
500 | * v9fs_file_write - write to a file | |
501 | * @filp: file pointer to write | |
502 | * @data: data buffer to write data from | |
503 | * @count: size of buffer | |
504 | * @offset: offset at which to write data | |
505 | * | |
506 | */ | |
507 | static ssize_t | |
508 | v9fs_file_write(struct file *filp, const char __user * data, | |
509 | size_t count, loff_t *offset) | |
510 | { | |
511 | ssize_t retval = 0; | |
512 | loff_t origin = *offset; | |
513 | ||
514 | ||
515 | retval = generic_write_checks(filp, &origin, &count, 0); | |
516 | if (retval) | |
517 | goto out; | |
518 | ||
519 | retval = -EINVAL; | |
520 | if ((ssize_t) count < 0) | |
521 | goto out; | |
522 | retval = 0; | |
523 | if (!count) | |
524 | goto out; | |
525 | ||
496ad9aa | 526 | retval = v9fs_file_write_internal(file_inode(filp), |
17311779 | 527 | filp->private_data, |
aaf0ef1d MK |
528 | data, count, &origin, 1); |
529 | /* update offset on successful write */ | |
530 | if (retval > 0) | |
531 | *offset = origin; | |
3834b12a HPB |
532 | out: |
533 | return retval; | |
e69e7fe5 EVH |
534 | } |
535 | ||
7263cebe | 536 | |
02c24a82 JB |
537 | static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end, |
538 | int datasync) | |
7a4439c4 MK |
539 | { |
540 | struct p9_fid *fid; | |
02c24a82 | 541 | struct inode *inode = filp->f_mapping->host; |
7a4439c4 MK |
542 | struct p9_wstat wstat; |
543 | int retval; | |
544 | ||
02c24a82 JB |
545 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
546 | if (retval) | |
547 | return retval; | |
548 | ||
549 | mutex_lock(&inode->i_mutex); | |
5d385153 | 550 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
7a4439c4 MK |
551 | |
552 | fid = filp->private_data; | |
553 | v9fs_blank_wstat(&wstat); | |
554 | ||
555 | retval = p9_client_wstat(fid, &wstat); | |
02c24a82 JB |
556 | mutex_unlock(&inode->i_mutex); |
557 | ||
7a4439c4 MK |
558 | return retval; |
559 | } | |
560 | ||
02c24a82 JB |
561 | int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, |
562 | int datasync) | |
920e65dc VJJ |
563 | { |
564 | struct p9_fid *fid; | |
02c24a82 | 565 | struct inode *inode = filp->f_mapping->host; |
920e65dc VJJ |
566 | int retval; |
567 | ||
02c24a82 JB |
568 | retval = filemap_write_and_wait_range(inode->i_mapping, start, end); |
569 | if (retval) | |
570 | return retval; | |
571 | ||
572 | mutex_lock(&inode->i_mutex); | |
5d385153 | 573 | p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); |
920e65dc VJJ |
574 | |
575 | fid = filp->private_data; | |
576 | ||
b165d601 | 577 | retval = p9_client_fsync(fid, datasync); |
02c24a82 JB |
578 | mutex_unlock(&inode->i_mutex); |
579 | ||
920e65dc VJJ |
580 | return retval; |
581 | } | |
582 | ||
7263cebe | 583 | static int |
fb89b45c | 584 | v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma) |
7263cebe AK |
585 | { |
586 | int retval; | |
587 | ||
fb89b45c DM |
588 | |
589 | retval = generic_file_mmap(filp, vma); | |
7263cebe AK |
590 | if (!retval) |
591 | vma->vm_ops = &v9fs_file_vm_ops; | |
592 | ||
593 | return retval; | |
594 | } | |
595 | ||
fb89b45c DM |
596 | static int |
597 | v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma) | |
598 | { | |
599 | int retval; | |
600 | struct inode *inode; | |
601 | struct v9fs_inode *v9inode; | |
602 | struct p9_fid *fid; | |
603 | ||
604 | inode = file_inode(filp); | |
605 | v9inode = V9FS_I(inode); | |
606 | mutex_lock(&v9inode->v_mutex); | |
607 | if (!v9inode->writeback_fid && | |
608 | (vma->vm_flags & VM_WRITE)) { | |
609 | /* | |
610 | * clone a fid and add it to writeback_fid | |
611 | * we do it during mmap instead of | |
612 | * page dirty time via write_begin/page_mkwrite | |
613 | * because we want write after unlink usecase | |
614 | * to work. | |
615 | */ | |
616 | fid = v9fs_writeback_fid(filp->f_path.dentry); | |
617 | if (IS_ERR(fid)) { | |
618 | retval = PTR_ERR(fid); | |
619 | mutex_unlock(&v9inode->v_mutex); | |
620 | return retval; | |
621 | } | |
622 | v9inode->writeback_fid = (void *) fid; | |
623 | } | |
624 | mutex_unlock(&v9inode->v_mutex); | |
625 | ||
626 | retval = generic_file_mmap(filp, vma); | |
627 | if (!retval) | |
628 | vma->vm_ops = &v9fs_mmap_file_vm_ops; | |
629 | ||
630 | return retval; | |
631 | } | |
632 | ||
7263cebe AK |
633 | static int |
634 | v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) | |
635 | { | |
6b39f6d2 | 636 | struct v9fs_inode *v9inode; |
7263cebe AK |
637 | struct page *page = vmf->page; |
638 | struct file *filp = vma->vm_file; | |
496ad9aa | 639 | struct inode *inode = file_inode(filp); |
7263cebe AK |
640 | |
641 | ||
5d385153 JP |
642 | p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n", |
643 | page, (unsigned long)filp->private_data); | |
7263cebe | 644 | |
120c2bca JK |
645 | /* Update file times before taking page lock */ |
646 | file_update_time(filp); | |
647 | ||
6b39f6d2 | 648 | v9inode = V9FS_I(inode); |
7263cebe AK |
649 | /* make sure the cache has finished storing the page */ |
650 | v9fs_fscache_wait_on_page_write(inode, page); | |
6b39f6d2 | 651 | BUG_ON(!v9inode->writeback_fid); |
7263cebe AK |
652 | lock_page(page); |
653 | if (page->mapping != inode->i_mapping) | |
654 | goto out_unlock; | |
13575ca1 | 655 | wait_for_stable_page(page); |
7263cebe AK |
656 | |
657 | return VM_FAULT_LOCKED; | |
658 | out_unlock: | |
659 | unlock_page(page); | |
660 | return VM_FAULT_NOPAGE; | |
661 | } | |
662 | ||
e959b549 AK |
663 | static ssize_t |
664 | v9fs_direct_read(struct file *filp, char __user *udata, size_t count, | |
665 | loff_t *offsetp) | |
666 | { | |
667 | loff_t size, offset; | |
668 | struct inode *inode; | |
669 | struct address_space *mapping; | |
670 | ||
671 | offset = *offsetp; | |
672 | mapping = filp->f_mapping; | |
673 | inode = mapping->host; | |
674 | if (!count) | |
675 | return 0; | |
676 | size = i_size_read(inode); | |
677 | if (offset < size) | |
678 | filemap_write_and_wait_range(mapping, offset, | |
679 | offset + count - 1); | |
680 | ||
681 | return v9fs_file_read(filp, udata, count, offsetp); | |
682 | } | |
683 | ||
684 | /** | |
685 | * v9fs_cached_file_read - read from a file | |
686 | * @filp: file pointer to read | |
687 | * @udata: user data buffer to read data into | |
688 | * @count: size of buffer | |
689 | * @offset: offset at which to read data | |
690 | * | |
691 | */ | |
692 | static ssize_t | |
693 | v9fs_cached_file_read(struct file *filp, char __user *data, size_t count, | |
694 | loff_t *offset) | |
695 | { | |
696 | if (filp->f_flags & O_DIRECT) | |
697 | return v9fs_direct_read(filp, data, count, offset); | |
698 | return do_sync_read(filp, data, count, offset); | |
699 | } | |
700 | ||
fb89b45c DM |
701 | /** |
702 | * v9fs_mmap_file_read - read from a file | |
703 | * @filp: file pointer to read | |
704 | * @udata: user data buffer to read data into | |
705 | * @count: size of buffer | |
706 | * @offset: offset at which to read data | |
707 | * | |
708 | */ | |
709 | static ssize_t | |
710 | v9fs_mmap_file_read(struct file *filp, char __user *data, size_t count, | |
711 | loff_t *offset) | |
712 | { | |
713 | /* TODO: Check if there are dirty pages */ | |
714 | return v9fs_file_read(filp, data, count, offset); | |
715 | } | |
716 | ||
e959b549 AK |
717 | static ssize_t |
718 | v9fs_direct_write(struct file *filp, const char __user * data, | |
719 | size_t count, loff_t *offsetp) | |
720 | { | |
721 | loff_t offset; | |
722 | ssize_t retval; | |
723 | struct inode *inode; | |
724 | struct address_space *mapping; | |
725 | ||
726 | offset = *offsetp; | |
727 | mapping = filp->f_mapping; | |
728 | inode = mapping->host; | |
729 | if (!count) | |
730 | return 0; | |
731 | ||
732 | mutex_lock(&inode->i_mutex); | |
733 | retval = filemap_write_and_wait_range(mapping, offset, | |
734 | offset + count - 1); | |
735 | if (retval) | |
736 | goto err_out; | |
737 | /* | |
738 | * After a write we want buffered reads to be sure to go to disk to get | |
739 | * the new data. We invalidate clean cached page from the region we're | |
740 | * about to write. We do this *before* the write so that if we fail | |
741 | * here we fall back to buffered write | |
742 | */ | |
743 | if (mapping->nrpages) { | |
744 | pgoff_t pg_start = offset >> PAGE_CACHE_SHIFT; | |
745 | pgoff_t pg_end = (offset + count - 1) >> PAGE_CACHE_SHIFT; | |
746 | ||
747 | retval = invalidate_inode_pages2_range(mapping, | |
748 | pg_start, pg_end); | |
749 | /* | |
750 | * If a page can not be invalidated, fall back | |
751 | * to buffered write. | |
752 | */ | |
753 | if (retval) { | |
754 | if (retval == -EBUSY) | |
755 | goto buff_write; | |
756 | goto err_out; | |
757 | } | |
758 | } | |
759 | retval = v9fs_file_write(filp, data, count, offsetp); | |
760 | err_out: | |
761 | mutex_unlock(&inode->i_mutex); | |
762 | return retval; | |
763 | ||
764 | buff_write: | |
765 | mutex_unlock(&inode->i_mutex); | |
766 | return do_sync_write(filp, data, count, offsetp); | |
767 | } | |
768 | ||
769 | /** | |
770 | * v9fs_cached_file_write - write to a file | |
771 | * @filp: file pointer to write | |
772 | * @data: data buffer to write data from | |
773 | * @count: size of buffer | |
774 | * @offset: offset at which to write data | |
775 | * | |
776 | */ | |
777 | static ssize_t | |
778 | v9fs_cached_file_write(struct file *filp, const char __user * data, | |
779 | size_t count, loff_t *offset) | |
780 | { | |
781 | ||
782 | if (filp->f_flags & O_DIRECT) | |
783 | return v9fs_direct_write(filp, data, count, offset); | |
784 | return do_sync_write(filp, data, count, offset); | |
785 | } | |
786 | ||
fb89b45c DM |
787 | |
788 | /** | |
789 | * v9fs_mmap_file_write - write to a file | |
790 | * @filp: file pointer to write | |
791 | * @data: data buffer to write data from | |
792 | * @count: size of buffer | |
793 | * @offset: offset at which to write data | |
794 | * | |
795 | */ | |
796 | static ssize_t | |
797 | v9fs_mmap_file_write(struct file *filp, const char __user *data, | |
798 | size_t count, loff_t *offset) | |
799 | { | |
800 | /* | |
801 | * TODO: invalidate mmaps on filp's inode between | |
802 | * offset and offset+count | |
803 | */ | |
804 | return v9fs_file_write(filp, data, count, offset); | |
805 | } | |
806 | ||
807 | static void v9fs_mmap_vm_close(struct vm_area_struct *vma) | |
808 | { | |
809 | struct inode *inode; | |
810 | ||
811 | struct writeback_control wbc = { | |
812 | .nr_to_write = LONG_MAX, | |
813 | .sync_mode = WB_SYNC_ALL, | |
814 | .range_start = vma->vm_pgoff * PAGE_SIZE, | |
815 | /* absolute end, byte at end included */ | |
816 | .range_end = vma->vm_pgoff * PAGE_SIZE + | |
817 | (vma->vm_end - vma->vm_start - 1), | |
818 | }; | |
819 | ||
820 | ||
821 | p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma); | |
822 | ||
823 | inode = file_inode(vma->vm_file); | |
824 | ||
825 | if (!mapping_cap_writeback_dirty(inode->i_mapping)) | |
826 | wbc.nr_to_write = 0; | |
827 | ||
828 | might_sleep(); | |
829 | sync_inode(inode, &wbc); | |
830 | } | |
831 | ||
832 | ||
7263cebe AK |
833 | static const struct vm_operations_struct v9fs_file_vm_ops = { |
834 | .fault = filemap_fault, | |
835 | .page_mkwrite = v9fs_vm_page_mkwrite, | |
0b173bc4 | 836 | .remap_pages = generic_file_remap_pages, |
7263cebe AK |
837 | }; |
838 | ||
fb89b45c DM |
839 | static const struct vm_operations_struct v9fs_mmap_file_vm_ops = { |
840 | .close = v9fs_mmap_vm_close, | |
841 | .fault = filemap_fault, | |
842 | .page_mkwrite = v9fs_vm_page_mkwrite, | |
843 | .remap_pages = generic_file_remap_pages, | |
844 | }; | |
845 | ||
e959b549 | 846 | |
29236f4e | 847 | const struct file_operations v9fs_cached_file_operations = { |
e03abc0c | 848 | .llseek = generic_file_llseek, |
e959b549 AK |
849 | .read = v9fs_cached_file_read, |
850 | .write = v9fs_cached_file_write, | |
e03abc0c | 851 | .aio_read = generic_file_aio_read, |
7263cebe | 852 | .aio_write = generic_file_aio_write, |
e03abc0c EVH |
853 | .open = v9fs_file_open, |
854 | .release = v9fs_dir_release, | |
855 | .lock = v9fs_file_lock, | |
7263cebe | 856 | .mmap = v9fs_file_mmap, |
7a4439c4 | 857 | .fsync = v9fs_file_fsync, |
e03abc0c EVH |
858 | }; |
859 | ||
29236f4e | 860 | const struct file_operations v9fs_cached_file_operations_dotl = { |
b04faaf3 | 861 | .llseek = generic_file_llseek, |
e959b549 AK |
862 | .read = v9fs_cached_file_read, |
863 | .write = v9fs_cached_file_write, | |
b04faaf3 | 864 | .aio_read = generic_file_aio_read, |
7263cebe | 865 | .aio_write = generic_file_aio_write, |
b04faaf3 VJJ |
866 | .open = v9fs_file_open, |
867 | .release = v9fs_dir_release, | |
a099027c MK |
868 | .lock = v9fs_file_lock_dotl, |
869 | .flock = v9fs_file_flock_dotl, | |
7263cebe | 870 | .mmap = v9fs_file_mmap, |
920e65dc | 871 | .fsync = v9fs_file_fsync_dotl, |
b04faaf3 VJJ |
872 | }; |
873 | ||
4b6f5d20 | 874 | const struct file_operations v9fs_file_operations = { |
e69e7fe5 EVH |
875 | .llseek = generic_file_llseek, |
876 | .read = v9fs_file_read, | |
877 | .write = v9fs_file_write, | |
878 | .open = v9fs_file_open, | |
879 | .release = v9fs_dir_release, | |
880 | .lock = v9fs_file_lock, | |
14b8869f | 881 | .mmap = generic_file_readonly_mmap, |
7a4439c4 | 882 | .fsync = v9fs_file_fsync, |
e69e7fe5 | 883 | }; |
9b6533c9 SK |
884 | |
885 | const struct file_operations v9fs_file_operations_dotl = { | |
886 | .llseek = generic_file_llseek, | |
887 | .read = v9fs_file_read, | |
888 | .write = v9fs_file_write, | |
889 | .open = v9fs_file_open, | |
890 | .release = v9fs_dir_release, | |
a099027c MK |
891 | .lock = v9fs_file_lock_dotl, |
892 | .flock = v9fs_file_flock_dotl, | |
9b6533c9 | 893 | .mmap = generic_file_readonly_mmap, |
920e65dc | 894 | .fsync = v9fs_file_fsync_dotl, |
9b6533c9 | 895 | }; |
fb89b45c DM |
896 | |
897 | const struct file_operations v9fs_mmap_file_operations = { | |
898 | .llseek = generic_file_llseek, | |
899 | .read = v9fs_mmap_file_read, | |
900 | .write = v9fs_mmap_file_write, | |
901 | .open = v9fs_file_open, | |
902 | .release = v9fs_dir_release, | |
903 | .lock = v9fs_file_lock, | |
904 | .mmap = v9fs_mmap_file_mmap, | |
905 | .fsync = v9fs_file_fsync, | |
906 | }; | |
907 | ||
908 | const struct file_operations v9fs_mmap_file_operations_dotl = { | |
909 | .llseek = generic_file_llseek, | |
910 | .read = v9fs_mmap_file_read, | |
911 | .write = v9fs_mmap_file_write, | |
912 | .open = v9fs_file_open, | |
913 | .release = v9fs_dir_release, | |
914 | .lock = v9fs_file_lock_dotl, | |
915 | .flock = v9fs_file_flock_dotl, | |
916 | .mmap = v9fs_mmap_file_mmap, | |
917 | .fsync = v9fs_file_fsync_dotl, | |
918 | }; |