Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/read_write.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | #include <linux/slab.h> | |
8 | #include <linux/stat.h> | |
9 | #include <linux/fcntl.h> | |
10 | #include <linux/file.h> | |
11 | #include <linux/uio.h> | |
0eeca283 | 12 | #include <linux/fsnotify.h> |
1da177e4 | 13 | #include <linux/security.h> |
630d9c47 | 14 | #include <linux/export.h> |
1da177e4 | 15 | #include <linux/syscalls.h> |
e28cc715 | 16 | #include <linux/pagemap.h> |
d6b29d7c | 17 | #include <linux/splice.h> |
561c6731 | 18 | #include <linux/compat.h> |
29732938 | 19 | #include <linux/mount.h> |
2feb55f8 | 20 | #include <linux/fs.h> |
06ae43f3 | 21 | #include "internal.h" |
1da177e4 LT |
22 | |
23 | #include <asm/uaccess.h> | |
24 | #include <asm/unistd.h> | |
25 | ||
c0bd14af | 26 | typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *); |
293bc982 | 27 | typedef ssize_t (*iter_fn_t)(struct kiocb *, struct iov_iter *); |
c0bd14af | 28 | |
4b6f5d20 | 29 | const struct file_operations generic_ro_fops = { |
1da177e4 | 30 | .llseek = generic_file_llseek, |
aad4f8bb | 31 | .read_iter = generic_file_read_iter, |
1da177e4 | 32 | .mmap = generic_file_readonly_mmap, |
534f2aaa | 33 | .splice_read = generic_file_splice_read, |
1da177e4 LT |
34 | }; |
35 | ||
36 | EXPORT_SYMBOL(generic_ro_fops); | |
37 | ||
cccb5a1e | 38 | static inline int unsigned_offsets(struct file *file) |
4a3956c7 | 39 | { |
cccb5a1e | 40 | return file->f_mode & FMODE_UNSIGNED_OFFSET; |
4a3956c7 KH |
41 | } |
42 | ||
46a1c2c7 JL |
43 | /** |
44 | * vfs_setpos - update the file offset for lseek | |
45 | * @file: file structure in question | |
46 | * @offset: file offset to seek to | |
47 | * @maxsize: maximum file size | |
48 | * | |
49 | * This is a low-level filesystem helper for updating the file offset to | |
50 | * the value specified by @offset if the given offset is valid and it is | |
51 | * not equal to the current file offset. | |
52 | * | |
53 | * Return the specified offset on success and -EINVAL on invalid offset. | |
54 | */ | |
55 | loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize) | |
ef3d0fd2 AK |
56 | { |
57 | if (offset < 0 && !unsigned_offsets(file)) | |
58 | return -EINVAL; | |
59 | if (offset > maxsize) | |
60 | return -EINVAL; | |
61 | ||
62 | if (offset != file->f_pos) { | |
63 | file->f_pos = offset; | |
64 | file->f_version = 0; | |
65 | } | |
66 | return offset; | |
67 | } | |
46a1c2c7 | 68 | EXPORT_SYMBOL(vfs_setpos); |
ef3d0fd2 | 69 | |
3a8cff4f | 70 | /** |
5760495a | 71 | * generic_file_llseek_size - generic llseek implementation for regular files |
3a8cff4f CH |
72 | * @file: file structure to seek on |
73 | * @offset: file offset to seek to | |
965c8e59 | 74 | * @whence: type of seek |
e8b96eb5 ES |
75 | * @size: max size of this file in file system |
76 | * @eof: offset used for SEEK_END position | |
3a8cff4f | 77 | * |
5760495a | 78 | * This is a variant of generic_file_llseek that allows passing in a custom |
e8b96eb5 | 79 | * maximum file size and a custom EOF position, for e.g. hashed directories |
ef3d0fd2 AK |
80 | * |
81 | * Synchronization: | |
5760495a | 82 | * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms) |
ef3d0fd2 AK |
83 | * SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes. |
84 | * read/writes behave like SEEK_SET against seeks. | |
3a8cff4f | 85 | */ |
9465efc9 | 86 | loff_t |
965c8e59 | 87 | generic_file_llseek_size(struct file *file, loff_t offset, int whence, |
e8b96eb5 | 88 | loff_t maxsize, loff_t eof) |
1da177e4 | 89 | { |
965c8e59 | 90 | switch (whence) { |
3a8cff4f | 91 | case SEEK_END: |
e8b96eb5 | 92 | offset += eof; |
3a8cff4f CH |
93 | break; |
94 | case SEEK_CUR: | |
5b6f1eb9 AK |
95 | /* |
96 | * Here we special-case the lseek(fd, 0, SEEK_CUR) | |
97 | * position-querying operation. Avoid rewriting the "same" | |
98 | * f_pos value back to the file because a concurrent read(), | |
99 | * write() or lseek() might have altered it | |
100 | */ | |
101 | if (offset == 0) | |
102 | return file->f_pos; | |
ef3d0fd2 AK |
103 | /* |
104 | * f_lock protects against read/modify/write race with other | |
105 | * SEEK_CURs. Note that parallel writes and reads behave | |
106 | * like SEEK_SET. | |
107 | */ | |
108 | spin_lock(&file->f_lock); | |
46a1c2c7 | 109 | offset = vfs_setpos(file, file->f_pos + offset, maxsize); |
ef3d0fd2 AK |
110 | spin_unlock(&file->f_lock); |
111 | return offset; | |
982d8165 JB |
112 | case SEEK_DATA: |
113 | /* | |
114 | * In the generic case the entire file is data, so as long as | |
115 | * offset isn't at the end of the file then the offset is data. | |
116 | */ | |
e8b96eb5 | 117 | if (offset >= eof) |
982d8165 JB |
118 | return -ENXIO; |
119 | break; | |
120 | case SEEK_HOLE: | |
121 | /* | |
122 | * There is a virtual hole at the end of the file, so as long as | |
123 | * offset isn't i_size or larger, return i_size. | |
124 | */ | |
e8b96eb5 | 125 | if (offset >= eof) |
982d8165 | 126 | return -ENXIO; |
e8b96eb5 | 127 | offset = eof; |
982d8165 | 128 | break; |
1da177e4 | 129 | } |
3a8cff4f | 130 | |
46a1c2c7 | 131 | return vfs_setpos(file, offset, maxsize); |
5760495a AK |
132 | } |
133 | EXPORT_SYMBOL(generic_file_llseek_size); | |
134 | ||
135 | /** | |
136 | * generic_file_llseek - generic llseek implementation for regular files | |
137 | * @file: file structure to seek on | |
138 | * @offset: file offset to seek to | |
965c8e59 | 139 | * @whence: type of seek |
5760495a AK |
140 | * |
141 | * This is a generic implemenation of ->llseek useable for all normal local | |
142 | * filesystems. It just updates the file offset to the value specified by | |
546ae2d2 | 143 | * @offset and @whence. |
5760495a | 144 | */ |
965c8e59 | 145 | loff_t generic_file_llseek(struct file *file, loff_t offset, int whence) |
5760495a AK |
146 | { |
147 | struct inode *inode = file->f_mapping->host; | |
148 | ||
965c8e59 | 149 | return generic_file_llseek_size(file, offset, whence, |
e8b96eb5 ES |
150 | inode->i_sb->s_maxbytes, |
151 | i_size_read(inode)); | |
1da177e4 | 152 | } |
9465efc9 | 153 | EXPORT_SYMBOL(generic_file_llseek); |
1da177e4 | 154 | |
1bf9d14d AV |
155 | /** |
156 | * fixed_size_llseek - llseek implementation for fixed-sized devices | |
157 | * @file: file structure to seek on | |
158 | * @offset: file offset to seek to | |
159 | * @whence: type of seek | |
160 | * @size: size of the file | |
161 | * | |
162 | */ | |
163 | loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size) | |
164 | { | |
165 | switch (whence) { | |
166 | case SEEK_SET: case SEEK_CUR: case SEEK_END: | |
167 | return generic_file_llseek_size(file, offset, whence, | |
168 | size, size); | |
169 | default: | |
170 | return -EINVAL; | |
171 | } | |
172 | } | |
173 | EXPORT_SYMBOL(fixed_size_llseek); | |
174 | ||
b25472f9 AV |
175 | /** |
176 | * no_seek_end_llseek - llseek implementation for fixed-sized devices | |
177 | * @file: file structure to seek on | |
178 | * @offset: file offset to seek to | |
179 | * @whence: type of seek | |
180 | * | |
181 | */ | |
182 | loff_t no_seek_end_llseek(struct file *file, loff_t offset, int whence) | |
183 | { | |
184 | switch (whence) { | |
185 | case SEEK_SET: case SEEK_CUR: | |
186 | return generic_file_llseek_size(file, offset, whence, | |
2feb55f8 | 187 | OFFSET_MAX, 0); |
b25472f9 AV |
188 | default: |
189 | return -EINVAL; | |
190 | } | |
191 | } | |
192 | EXPORT_SYMBOL(no_seek_end_llseek); | |
193 | ||
194 | /** | |
195 | * no_seek_end_llseek_size - llseek implementation for fixed-sized devices | |
196 | * @file: file structure to seek on | |
197 | * @offset: file offset to seek to | |
198 | * @whence: type of seek | |
199 | * @size: maximal offset allowed | |
200 | * | |
201 | */ | |
202 | loff_t no_seek_end_llseek_size(struct file *file, loff_t offset, int whence, loff_t size) | |
203 | { | |
204 | switch (whence) { | |
205 | case SEEK_SET: case SEEK_CUR: | |
206 | return generic_file_llseek_size(file, offset, whence, | |
207 | size, 0); | |
208 | default: | |
209 | return -EINVAL; | |
210 | } | |
211 | } | |
212 | EXPORT_SYMBOL(no_seek_end_llseek_size); | |
213 | ||
ae6afc3f B |
214 | /** |
215 | * noop_llseek - No Operation Performed llseek implementation | |
216 | * @file: file structure to seek on | |
217 | * @offset: file offset to seek to | |
965c8e59 | 218 | * @whence: type of seek |
ae6afc3f B |
219 | * |
220 | * This is an implementation of ->llseek useable for the rare special case when | |
221 | * userspace expects the seek to succeed but the (device) file is actually not | |
222 | * able to perform the seek. In this case you use noop_llseek() instead of | |
223 | * falling back to the default implementation of ->llseek. | |
224 | */ | |
965c8e59 | 225 | loff_t noop_llseek(struct file *file, loff_t offset, int whence) |
ae6afc3f B |
226 | { |
227 | return file->f_pos; | |
228 | } | |
229 | EXPORT_SYMBOL(noop_llseek); | |
230 | ||
965c8e59 | 231 | loff_t no_llseek(struct file *file, loff_t offset, int whence) |
1da177e4 LT |
232 | { |
233 | return -ESPIPE; | |
234 | } | |
235 | EXPORT_SYMBOL(no_llseek); | |
236 | ||
965c8e59 | 237 | loff_t default_llseek(struct file *file, loff_t offset, int whence) |
1da177e4 | 238 | { |
496ad9aa | 239 | struct inode *inode = file_inode(file); |
16abef0e | 240 | loff_t retval; |
1da177e4 | 241 | |
5955102c | 242 | inode_lock(inode); |
965c8e59 | 243 | switch (whence) { |
7b8e8924 | 244 | case SEEK_END: |
982d8165 | 245 | offset += i_size_read(inode); |
1da177e4 | 246 | break; |
7b8e8924 | 247 | case SEEK_CUR: |
5b6f1eb9 AK |
248 | if (offset == 0) { |
249 | retval = file->f_pos; | |
250 | goto out; | |
251 | } | |
1da177e4 | 252 | offset += file->f_pos; |
982d8165 JB |
253 | break; |
254 | case SEEK_DATA: | |
255 | /* | |
256 | * In the generic case the entire file is data, so as | |
257 | * long as offset isn't at the end of the file then the | |
258 | * offset is data. | |
259 | */ | |
bacb2d81 DC |
260 | if (offset >= inode->i_size) { |
261 | retval = -ENXIO; | |
262 | goto out; | |
263 | } | |
982d8165 JB |
264 | break; |
265 | case SEEK_HOLE: | |
266 | /* | |
267 | * There is a virtual hole at the end of the file, so | |
268 | * as long as offset isn't i_size or larger, return | |
269 | * i_size. | |
270 | */ | |
bacb2d81 DC |
271 | if (offset >= inode->i_size) { |
272 | retval = -ENXIO; | |
273 | goto out; | |
274 | } | |
982d8165 JB |
275 | offset = inode->i_size; |
276 | break; | |
1da177e4 LT |
277 | } |
278 | retval = -EINVAL; | |
cccb5a1e | 279 | if (offset >= 0 || unsigned_offsets(file)) { |
1da177e4 LT |
280 | if (offset != file->f_pos) { |
281 | file->f_pos = offset; | |
282 | file->f_version = 0; | |
283 | } | |
284 | retval = offset; | |
285 | } | |
5b6f1eb9 | 286 | out: |
5955102c | 287 | inode_unlock(inode); |
1da177e4 LT |
288 | return retval; |
289 | } | |
290 | EXPORT_SYMBOL(default_llseek); | |
291 | ||
965c8e59 | 292 | loff_t vfs_llseek(struct file *file, loff_t offset, int whence) |
1da177e4 LT |
293 | { |
294 | loff_t (*fn)(struct file *, loff_t, int); | |
295 | ||
296 | fn = no_llseek; | |
297 | if (file->f_mode & FMODE_LSEEK) { | |
72c2d531 | 298 | if (file->f_op->llseek) |
1da177e4 LT |
299 | fn = file->f_op->llseek; |
300 | } | |
965c8e59 | 301 | return fn(file, offset, whence); |
1da177e4 LT |
302 | } |
303 | EXPORT_SYMBOL(vfs_llseek); | |
304 | ||
9c225f26 LT |
305 | static inline struct fd fdget_pos(int fd) |
306 | { | |
bd2a31d5 | 307 | return __to_fd(__fdget_pos(fd)); |
9c225f26 LT |
308 | } |
309 | ||
310 | static inline void fdput_pos(struct fd f) | |
311 | { | |
312 | if (f.flags & FDPUT_POS_UNLOCK) | |
313 | mutex_unlock(&f.file->f_pos_lock); | |
314 | fdput(f); | |
315 | } | |
316 | ||
965c8e59 | 317 | SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence) |
1da177e4 LT |
318 | { |
319 | off_t retval; | |
9c225f26 | 320 | struct fd f = fdget_pos(fd); |
2903ff01 AV |
321 | if (!f.file) |
322 | return -EBADF; | |
1da177e4 LT |
323 | |
324 | retval = -EINVAL; | |
965c8e59 AM |
325 | if (whence <= SEEK_MAX) { |
326 | loff_t res = vfs_llseek(f.file, offset, whence); | |
1da177e4 LT |
327 | retval = res; |
328 | if (res != (loff_t)retval) | |
329 | retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */ | |
330 | } | |
9c225f26 | 331 | fdput_pos(f); |
1da177e4 LT |
332 | return retval; |
333 | } | |
334 | ||
561c6731 AV |
335 | #ifdef CONFIG_COMPAT |
336 | COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence) | |
337 | { | |
338 | return sys_lseek(fd, offset, whence); | |
339 | } | |
340 | #endif | |
341 | ||
1da177e4 | 342 | #ifdef __ARCH_WANT_SYS_LLSEEK |
003d7ab4 HC |
343 | SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high, |
344 | unsigned long, offset_low, loff_t __user *, result, | |
965c8e59 | 345 | unsigned int, whence) |
1da177e4 LT |
346 | { |
347 | int retval; | |
d7a15f8d | 348 | struct fd f = fdget_pos(fd); |
1da177e4 | 349 | loff_t offset; |
1da177e4 | 350 | |
2903ff01 AV |
351 | if (!f.file) |
352 | return -EBADF; | |
1da177e4 LT |
353 | |
354 | retval = -EINVAL; | |
965c8e59 | 355 | if (whence > SEEK_MAX) |
1da177e4 LT |
356 | goto out_putf; |
357 | ||
2903ff01 | 358 | offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low, |
965c8e59 | 359 | whence); |
1da177e4 LT |
360 | |
361 | retval = (int)offset; | |
362 | if (offset >= 0) { | |
363 | retval = -EFAULT; | |
364 | if (!copy_to_user(result, &offset, sizeof(offset))) | |
365 | retval = 0; | |
366 | } | |
367 | out_putf: | |
d7a15f8d | 368 | fdput_pos(f); |
1da177e4 LT |
369 | return retval; |
370 | } | |
371 | #endif | |
372 | ||
dbe4e192 CH |
373 | ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos) |
374 | { | |
375 | struct kiocb kiocb; | |
376 | ssize_t ret; | |
377 | ||
378 | if (!file->f_op->read_iter) | |
379 | return -EINVAL; | |
380 | ||
381 | init_sync_kiocb(&kiocb, file); | |
382 | kiocb.ki_pos = *ppos; | |
dbe4e192 CH |
383 | |
384 | iter->type |= READ; | |
385 | ret = file->f_op->read_iter(&kiocb, iter); | |
599bd19b | 386 | BUG_ON(ret == -EIOCBQUEUED); |
dbe4e192 CH |
387 | if (ret > 0) |
388 | *ppos = kiocb.ki_pos; | |
389 | return ret; | |
390 | } | |
391 | EXPORT_SYMBOL(vfs_iter_read); | |
392 | ||
393 | ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos) | |
394 | { | |
395 | struct kiocb kiocb; | |
396 | ssize_t ret; | |
397 | ||
398 | if (!file->f_op->write_iter) | |
399 | return -EINVAL; | |
400 | ||
401 | init_sync_kiocb(&kiocb, file); | |
402 | kiocb.ki_pos = *ppos; | |
dbe4e192 CH |
403 | |
404 | iter->type |= WRITE; | |
405 | ret = file->f_op->write_iter(&kiocb, iter); | |
599bd19b | 406 | BUG_ON(ret == -EIOCBQUEUED); |
dbe4e192 CH |
407 | if (ret > 0) |
408 | *ppos = kiocb.ki_pos; | |
409 | return ret; | |
410 | } | |
411 | EXPORT_SYMBOL(vfs_iter_write); | |
412 | ||
e28cc715 LT |
413 | /* |
414 | * rw_verify_area doesn't like huge counts. We limit | |
415 | * them to something that fits in "int" so that others | |
416 | * won't have to do range checks all the time. | |
417 | */ | |
68d70d03 | 418 | int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count) |
1da177e4 LT |
419 | { |
420 | struct inode *inode; | |
421 | loff_t pos; | |
c43e259c | 422 | int retval = -EINVAL; |
1da177e4 | 423 | |
496ad9aa | 424 | inode = file_inode(file); |
e28cc715 | 425 | if (unlikely((ssize_t) count < 0)) |
c43e259c | 426 | return retval; |
1da177e4 | 427 | pos = *ppos; |
cccb5a1e AV |
428 | if (unlikely(pos < 0)) { |
429 | if (!unsigned_offsets(file)) | |
430 | return retval; | |
431 | if (count >= -pos) /* both values are in 0..LLONG_MAX */ | |
432 | return -EOVERFLOW; | |
433 | } else if (unlikely((loff_t) (pos + count) < 0)) { | |
434 | if (!unsigned_offsets(file)) | |
4a3956c7 KH |
435 | return retval; |
436 | } | |
1da177e4 | 437 | |
bd61e0a9 | 438 | if (unlikely(inode->i_flctx && mandatory_lock(inode))) { |
acc15575 CH |
439 | retval = locks_mandatory_area(inode, file, pos, pos + count - 1, |
440 | read_write == READ ? F_RDLCK : F_WRLCK); | |
e28cc715 LT |
441 | if (retval < 0) |
442 | return retval; | |
443 | } | |
c43e259c JM |
444 | retval = security_file_permission(file, |
445 | read_write == READ ? MAY_READ : MAY_WRITE); | |
446 | if (retval) | |
447 | return retval; | |
e28cc715 | 448 | return count > MAX_RW_COUNT ? MAX_RW_COUNT : count; |
1da177e4 LT |
449 | } |
450 | ||
5d5d5689 | 451 | static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) |
293bc982 AV |
452 | { |
453 | struct iovec iov = { .iov_base = buf, .iov_len = len }; | |
454 | struct kiocb kiocb; | |
455 | struct iov_iter iter; | |
456 | ssize_t ret; | |
457 | ||
458 | init_sync_kiocb(&kiocb, filp); | |
459 | kiocb.ki_pos = *ppos; | |
293bc982 AV |
460 | iov_iter_init(&iter, READ, &iov, 1, len); |
461 | ||
462 | ret = filp->f_op->read_iter(&kiocb, &iter); | |
599bd19b | 463 | BUG_ON(ret == -EIOCBQUEUED); |
293bc982 AV |
464 | *ppos = kiocb.ki_pos; |
465 | return ret; | |
466 | } | |
467 | ||
6fb5032e DK |
468 | ssize_t __vfs_read(struct file *file, char __user *buf, size_t count, |
469 | loff_t *pos) | |
470 | { | |
6fb5032e | 471 | if (file->f_op->read) |
3d04c8a1 | 472 | return file->f_op->read(file, buf, count, pos); |
6fb5032e | 473 | else if (file->f_op->read_iter) |
3d04c8a1 | 474 | return new_sync_read(file, buf, count, pos); |
6fb5032e | 475 | else |
3d04c8a1 | 476 | return -EINVAL; |
6fb5032e | 477 | } |
3d04c8a1 | 478 | EXPORT_SYMBOL(__vfs_read); |
6fb5032e | 479 | |
1da177e4 LT |
480 | ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) |
481 | { | |
482 | ssize_t ret; | |
483 | ||
484 | if (!(file->f_mode & FMODE_READ)) | |
485 | return -EBADF; | |
7f7f25e8 | 486 | if (!(file->f_mode & FMODE_CAN_READ)) |
1da177e4 LT |
487 | return -EINVAL; |
488 | if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) | |
489 | return -EFAULT; | |
490 | ||
491 | ret = rw_verify_area(READ, file, pos, count); | |
e28cc715 LT |
492 | if (ret >= 0) { |
493 | count = ret; | |
6fb5032e | 494 | ret = __vfs_read(file, buf, count, pos); |
c43e259c | 495 | if (ret > 0) { |
2a12a9d7 | 496 | fsnotify_access(file); |
c43e259c | 497 | add_rchar(current, ret); |
1da177e4 | 498 | } |
c43e259c | 499 | inc_syscr(current); |
1da177e4 LT |
500 | } |
501 | ||
502 | return ret; | |
503 | } | |
504 | ||
505 | EXPORT_SYMBOL(vfs_read); | |
506 | ||
5d5d5689 | 507 | static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) |
293bc982 AV |
508 | { |
509 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; | |
510 | struct kiocb kiocb; | |
511 | struct iov_iter iter; | |
512 | ssize_t ret; | |
513 | ||
514 | init_sync_kiocb(&kiocb, filp); | |
515 | kiocb.ki_pos = *ppos; | |
293bc982 AV |
516 | iov_iter_init(&iter, WRITE, &iov, 1, len); |
517 | ||
518 | ret = filp->f_op->write_iter(&kiocb, &iter); | |
599bd19b | 519 | BUG_ON(ret == -EIOCBQUEUED); |
f765b134 AV |
520 | if (ret > 0) |
521 | *ppos = kiocb.ki_pos; | |
293bc982 AV |
522 | return ret; |
523 | } | |
524 | ||
493c84c0 AV |
525 | ssize_t __vfs_write(struct file *file, const char __user *p, size_t count, |
526 | loff_t *pos) | |
527 | { | |
528 | if (file->f_op->write) | |
529 | return file->f_op->write(file, p, count, pos); | |
493c84c0 AV |
530 | else if (file->f_op->write_iter) |
531 | return new_sync_write(file, p, count, pos); | |
532 | else | |
533 | return -EINVAL; | |
534 | } | |
535 | EXPORT_SYMBOL(__vfs_write); | |
536 | ||
06ae43f3 AV |
537 | ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos) |
538 | { | |
539 | mm_segment_t old_fs; | |
540 | const char __user *p; | |
541 | ssize_t ret; | |
542 | ||
7f7f25e8 | 543 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
3e84f48e AV |
544 | return -EINVAL; |
545 | ||
06ae43f3 AV |
546 | old_fs = get_fs(); |
547 | set_fs(get_ds()); | |
548 | p = (__force const char __user *)buf; | |
549 | if (count > MAX_RW_COUNT) | |
550 | count = MAX_RW_COUNT; | |
493c84c0 | 551 | ret = __vfs_write(file, p, count, pos); |
06ae43f3 AV |
552 | set_fs(old_fs); |
553 | if (ret > 0) { | |
554 | fsnotify_modify(file); | |
555 | add_wchar(current, ret); | |
556 | } | |
557 | inc_syscw(current); | |
558 | return ret; | |
559 | } | |
560 | ||
2ec3a12a AV |
561 | EXPORT_SYMBOL(__kernel_write); |
562 | ||
1da177e4 LT |
563 | ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) |
564 | { | |
565 | ssize_t ret; | |
566 | ||
567 | if (!(file->f_mode & FMODE_WRITE)) | |
568 | return -EBADF; | |
7f7f25e8 | 569 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
1da177e4 LT |
570 | return -EINVAL; |
571 | if (unlikely(!access_ok(VERIFY_READ, buf, count))) | |
572 | return -EFAULT; | |
573 | ||
574 | ret = rw_verify_area(WRITE, file, pos, count); | |
e28cc715 LT |
575 | if (ret >= 0) { |
576 | count = ret; | |
03d95eb2 | 577 | file_start_write(file); |
493c84c0 | 578 | ret = __vfs_write(file, buf, count, pos); |
c43e259c | 579 | if (ret > 0) { |
2a12a9d7 | 580 | fsnotify_modify(file); |
c43e259c | 581 | add_wchar(current, ret); |
1da177e4 | 582 | } |
c43e259c | 583 | inc_syscw(current); |
03d95eb2 | 584 | file_end_write(file); |
1da177e4 LT |
585 | } |
586 | ||
587 | return ret; | |
588 | } | |
589 | ||
590 | EXPORT_SYMBOL(vfs_write); | |
591 | ||
592 | static inline loff_t file_pos_read(struct file *file) | |
593 | { | |
594 | return file->f_pos; | |
595 | } | |
596 | ||
597 | static inline void file_pos_write(struct file *file, loff_t pos) | |
598 | { | |
599 | file->f_pos = pos; | |
600 | } | |
601 | ||
3cdad428 | 602 | SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) |
1da177e4 | 603 | { |
9c225f26 | 604 | struct fd f = fdget_pos(fd); |
1da177e4 | 605 | ssize_t ret = -EBADF; |
1da177e4 | 606 | |
2903ff01 AV |
607 | if (f.file) { |
608 | loff_t pos = file_pos_read(f.file); | |
609 | ret = vfs_read(f.file, buf, count, &pos); | |
5faf153e AV |
610 | if (ret >= 0) |
611 | file_pos_write(f.file, pos); | |
9c225f26 | 612 | fdput_pos(f); |
1da177e4 | 613 | } |
1da177e4 LT |
614 | return ret; |
615 | } | |
1da177e4 | 616 | |
3cdad428 HC |
617 | SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, |
618 | size_t, count) | |
1da177e4 | 619 | { |
9c225f26 | 620 | struct fd f = fdget_pos(fd); |
1da177e4 | 621 | ssize_t ret = -EBADF; |
1da177e4 | 622 | |
2903ff01 AV |
623 | if (f.file) { |
624 | loff_t pos = file_pos_read(f.file); | |
625 | ret = vfs_write(f.file, buf, count, &pos); | |
5faf153e AV |
626 | if (ret >= 0) |
627 | file_pos_write(f.file, pos); | |
9c225f26 | 628 | fdput_pos(f); |
1da177e4 LT |
629 | } |
630 | ||
631 | return ret; | |
632 | } | |
633 | ||
4a0fd5bf AV |
634 | SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf, |
635 | size_t, count, loff_t, pos) | |
1da177e4 | 636 | { |
2903ff01 | 637 | struct fd f; |
1da177e4 | 638 | ssize_t ret = -EBADF; |
1da177e4 LT |
639 | |
640 | if (pos < 0) | |
641 | return -EINVAL; | |
642 | ||
2903ff01 AV |
643 | f = fdget(fd); |
644 | if (f.file) { | |
1da177e4 | 645 | ret = -ESPIPE; |
2903ff01 AV |
646 | if (f.file->f_mode & FMODE_PREAD) |
647 | ret = vfs_read(f.file, buf, count, &pos); | |
648 | fdput(f); | |
1da177e4 LT |
649 | } |
650 | ||
651 | return ret; | |
652 | } | |
653 | ||
4a0fd5bf AV |
654 | SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf, |
655 | size_t, count, loff_t, pos) | |
1da177e4 | 656 | { |
2903ff01 | 657 | struct fd f; |
1da177e4 | 658 | ssize_t ret = -EBADF; |
1da177e4 LT |
659 | |
660 | if (pos < 0) | |
661 | return -EINVAL; | |
662 | ||
2903ff01 AV |
663 | f = fdget(fd); |
664 | if (f.file) { | |
1da177e4 | 665 | ret = -ESPIPE; |
2903ff01 AV |
666 | if (f.file->f_mode & FMODE_PWRITE) |
667 | ret = vfs_write(f.file, buf, count, &pos); | |
668 | fdput(f); | |
1da177e4 LT |
669 | } |
670 | ||
671 | return ret; | |
672 | } | |
673 | ||
674 | /* | |
675 | * Reduce an iovec's length in-place. Return the resulting number of segments | |
676 | */ | |
677 | unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) | |
678 | { | |
679 | unsigned long seg = 0; | |
680 | size_t len = 0; | |
681 | ||
682 | while (seg < nr_segs) { | |
683 | seg++; | |
684 | if (len + iov->iov_len >= to) { | |
685 | iov->iov_len = to - len; | |
686 | break; | |
687 | } | |
688 | len += iov->iov_len; | |
689 | iov++; | |
690 | } | |
691 | return seg; | |
692 | } | |
19295529 | 693 | EXPORT_SYMBOL(iov_shorten); |
1da177e4 | 694 | |
ac15ac06 | 695 | static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter, |
793b80ef | 696 | loff_t *ppos, iter_fn_t fn, int flags) |
293bc982 AV |
697 | { |
698 | struct kiocb kiocb; | |
293bc982 AV |
699 | ssize_t ret; |
700 | ||
97be7ebe | 701 | if (flags & ~RWF_HIPRI) |
793b80ef CH |
702 | return -EOPNOTSUPP; |
703 | ||
293bc982 | 704 | init_sync_kiocb(&kiocb, filp); |
97be7ebe CH |
705 | if (flags & RWF_HIPRI) |
706 | kiocb.ki_flags |= IOCB_HIPRI; | |
293bc982 | 707 | kiocb.ki_pos = *ppos; |
293bc982 | 708 | |
ac15ac06 | 709 | ret = fn(&kiocb, iter); |
599bd19b | 710 | BUG_ON(ret == -EIOCBQUEUED); |
293bc982 AV |
711 | *ppos = kiocb.ki_pos; |
712 | return ret; | |
713 | } | |
714 | ||
ee0b3e67 | 715 | /* Do it by hand, with file-ops */ |
ac15ac06 | 716 | static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter, |
793b80ef | 717 | loff_t *ppos, io_fn_t fn, int flags) |
ee0b3e67 | 718 | { |
ee0b3e67 BP |
719 | ssize_t ret = 0; |
720 | ||
97be7ebe | 721 | if (flags & ~RWF_HIPRI) |
793b80ef CH |
722 | return -EOPNOTSUPP; |
723 | ||
ac15ac06 AV |
724 | while (iov_iter_count(iter)) { |
725 | struct iovec iovec = iov_iter_iovec(iter); | |
ee0b3e67 BP |
726 | ssize_t nr; |
727 | ||
ac15ac06 | 728 | nr = fn(filp, iovec.iov_base, iovec.iov_len, ppos); |
ee0b3e67 BP |
729 | |
730 | if (nr < 0) { | |
731 | if (!ret) | |
732 | ret = nr; | |
733 | break; | |
734 | } | |
735 | ret += nr; | |
ac15ac06 | 736 | if (nr != iovec.iov_len) |
ee0b3e67 | 737 | break; |
ac15ac06 | 738 | iov_iter_advance(iter, nr); |
ee0b3e67 BP |
739 | } |
740 | ||
741 | return ret; | |
742 | } | |
743 | ||
1da177e4 LT |
744 | /* A write operation does a read from user space and vice versa */ |
745 | #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) | |
746 | ||
eed4e51f BP |
747 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
748 | unsigned long nr_segs, unsigned long fast_segs, | |
749 | struct iovec *fast_pointer, | |
ac34ebb3 | 750 | struct iovec **ret_pointer) |
435f49a5 | 751 | { |
eed4e51f | 752 | unsigned long seg; |
435f49a5 | 753 | ssize_t ret; |
eed4e51f BP |
754 | struct iovec *iov = fast_pointer; |
755 | ||
435f49a5 LT |
756 | /* |
757 | * SuS says "The readv() function *may* fail if the iovcnt argument | |
758 | * was less than or equal to 0, or greater than {IOV_MAX}. Linux has | |
759 | * traditionally returned zero for zero segments, so... | |
760 | */ | |
eed4e51f BP |
761 | if (nr_segs == 0) { |
762 | ret = 0; | |
435f49a5 | 763 | goto out; |
eed4e51f BP |
764 | } |
765 | ||
435f49a5 LT |
766 | /* |
767 | * First get the "struct iovec" from user memory and | |
768 | * verify all the pointers | |
769 | */ | |
eed4e51f BP |
770 | if (nr_segs > UIO_MAXIOV) { |
771 | ret = -EINVAL; | |
435f49a5 | 772 | goto out; |
eed4e51f BP |
773 | } |
774 | if (nr_segs > fast_segs) { | |
435f49a5 | 775 | iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
eed4e51f BP |
776 | if (iov == NULL) { |
777 | ret = -ENOMEM; | |
435f49a5 | 778 | goto out; |
eed4e51f | 779 | } |
435f49a5 | 780 | } |
eed4e51f BP |
781 | if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { |
782 | ret = -EFAULT; | |
435f49a5 | 783 | goto out; |
eed4e51f BP |
784 | } |
785 | ||
435f49a5 | 786 | /* |
eed4e51f BP |
787 | * According to the Single Unix Specification we should return EINVAL |
788 | * if an element length is < 0 when cast to ssize_t or if the | |
789 | * total length would overflow the ssize_t return value of the | |
790 | * system call. | |
435f49a5 LT |
791 | * |
792 | * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the | |
793 | * overflow case. | |
794 | */ | |
eed4e51f | 795 | ret = 0; |
435f49a5 LT |
796 | for (seg = 0; seg < nr_segs; seg++) { |
797 | void __user *buf = iov[seg].iov_base; | |
798 | ssize_t len = (ssize_t)iov[seg].iov_len; | |
eed4e51f BP |
799 | |
800 | /* see if we we're about to use an invalid len or if | |
801 | * it's about to overflow ssize_t */ | |
435f49a5 | 802 | if (len < 0) { |
eed4e51f | 803 | ret = -EINVAL; |
435f49a5 | 804 | goto out; |
eed4e51f | 805 | } |
ac34ebb3 | 806 | if (type >= 0 |
fcf63409 | 807 | && unlikely(!access_ok(vrfy_dir(type), buf, len))) { |
eed4e51f | 808 | ret = -EFAULT; |
435f49a5 LT |
809 | goto out; |
810 | } | |
811 | if (len > MAX_RW_COUNT - ret) { | |
812 | len = MAX_RW_COUNT - ret; | |
813 | iov[seg].iov_len = len; | |
eed4e51f | 814 | } |
eed4e51f | 815 | ret += len; |
435f49a5 | 816 | } |
eed4e51f BP |
817 | out: |
818 | *ret_pointer = iov; | |
819 | return ret; | |
820 | } | |
821 | ||
1da177e4 LT |
822 | static ssize_t do_readv_writev(int type, struct file *file, |
823 | const struct iovec __user * uvector, | |
793b80ef CH |
824 | unsigned long nr_segs, loff_t *pos, |
825 | int flags) | |
1da177e4 | 826 | { |
1da177e4 LT |
827 | size_t tot_len; |
828 | struct iovec iovstack[UIO_FASTIOV]; | |
ee0b3e67 | 829 | struct iovec *iov = iovstack; |
ac15ac06 | 830 | struct iov_iter iter; |
1da177e4 | 831 | ssize_t ret; |
1da177e4 | 832 | io_fn_t fn; |
293bc982 | 833 | iter_fn_t iter_fn; |
1da177e4 | 834 | |
0504c074 AV |
835 | ret = import_iovec(type, uvector, nr_segs, |
836 | ARRAY_SIZE(iovstack), &iov, &iter); | |
837 | if (ret < 0) | |
838 | return ret; | |
1da177e4 | 839 | |
0504c074 AV |
840 | tot_len = iov_iter_count(&iter); |
841 | if (!tot_len) | |
842 | goto out; | |
1da177e4 | 843 | ret = rw_verify_area(type, file, pos, tot_len); |
e28cc715 | 844 | if (ret < 0) |
411b67b4 | 845 | goto out; |
1da177e4 | 846 | |
1da177e4 LT |
847 | if (type == READ) { |
848 | fn = file->f_op->read; | |
293bc982 | 849 | iter_fn = file->f_op->read_iter; |
1da177e4 LT |
850 | } else { |
851 | fn = (io_fn_t)file->f_op->write; | |
293bc982 | 852 | iter_fn = file->f_op->write_iter; |
03d95eb2 | 853 | file_start_write(file); |
1da177e4 LT |
854 | } |
855 | ||
293bc982 | 856 | if (iter_fn) |
793b80ef | 857 | ret = do_iter_readv_writev(file, &iter, pos, iter_fn, flags); |
ee0b3e67 | 858 | else |
793b80ef | 859 | ret = do_loop_readv_writev(file, &iter, pos, fn, flags); |
1da177e4 | 860 | |
03d95eb2 AV |
861 | if (type != READ) |
862 | file_end_write(file); | |
863 | ||
1da177e4 | 864 | out: |
0504c074 | 865 | kfree(iov); |
0eeca283 RL |
866 | if ((ret + (type == READ)) > 0) { |
867 | if (type == READ) | |
2a12a9d7 | 868 | fsnotify_access(file); |
0eeca283 | 869 | else |
2a12a9d7 | 870 | fsnotify_modify(file); |
0eeca283 | 871 | } |
1da177e4 | 872 | return ret; |
1da177e4 LT |
873 | } |
874 | ||
875 | ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, | |
793b80ef | 876 | unsigned long vlen, loff_t *pos, int flags) |
1da177e4 LT |
877 | { |
878 | if (!(file->f_mode & FMODE_READ)) | |
879 | return -EBADF; | |
7f7f25e8 | 880 | if (!(file->f_mode & FMODE_CAN_READ)) |
1da177e4 LT |
881 | return -EINVAL; |
882 | ||
793b80ef | 883 | return do_readv_writev(READ, file, vec, vlen, pos, flags); |
1da177e4 LT |
884 | } |
885 | ||
886 | EXPORT_SYMBOL(vfs_readv); | |
887 | ||
888 | ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, | |
793b80ef | 889 | unsigned long vlen, loff_t *pos, int flags) |
1da177e4 LT |
890 | { |
891 | if (!(file->f_mode & FMODE_WRITE)) | |
892 | return -EBADF; | |
7f7f25e8 | 893 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
1da177e4 LT |
894 | return -EINVAL; |
895 | ||
793b80ef | 896 | return do_readv_writev(WRITE, file, vec, vlen, pos, flags); |
1da177e4 LT |
897 | } |
898 | ||
899 | EXPORT_SYMBOL(vfs_writev); | |
900 | ||
f17d8b35 MT |
901 | static ssize_t do_readv(unsigned long fd, const struct iovec __user *vec, |
902 | unsigned long vlen, int flags) | |
1da177e4 | 903 | { |
9c225f26 | 904 | struct fd f = fdget_pos(fd); |
1da177e4 | 905 | ssize_t ret = -EBADF; |
1da177e4 | 906 | |
2903ff01 AV |
907 | if (f.file) { |
908 | loff_t pos = file_pos_read(f.file); | |
f17d8b35 | 909 | ret = vfs_readv(f.file, vec, vlen, &pos, flags); |
5faf153e AV |
910 | if (ret >= 0) |
911 | file_pos_write(f.file, pos); | |
9c225f26 | 912 | fdput_pos(f); |
1da177e4 LT |
913 | } |
914 | ||
915 | if (ret > 0) | |
4b98d11b AD |
916 | add_rchar(current, ret); |
917 | inc_syscr(current); | |
1da177e4 LT |
918 | return ret; |
919 | } | |
920 | ||
f17d8b35 MT |
921 | static ssize_t do_writev(unsigned long fd, const struct iovec __user *vec, |
922 | unsigned long vlen, int flags) | |
1da177e4 | 923 | { |
9c225f26 | 924 | struct fd f = fdget_pos(fd); |
1da177e4 | 925 | ssize_t ret = -EBADF; |
1da177e4 | 926 | |
2903ff01 AV |
927 | if (f.file) { |
928 | loff_t pos = file_pos_read(f.file); | |
f17d8b35 | 929 | ret = vfs_writev(f.file, vec, vlen, &pos, flags); |
5faf153e AV |
930 | if (ret >= 0) |
931 | file_pos_write(f.file, pos); | |
9c225f26 | 932 | fdput_pos(f); |
1da177e4 LT |
933 | } |
934 | ||
935 | if (ret > 0) | |
4b98d11b AD |
936 | add_wchar(current, ret); |
937 | inc_syscw(current); | |
1da177e4 LT |
938 | return ret; |
939 | } | |
940 | ||
601cc11d LT |
941 | static inline loff_t pos_from_hilo(unsigned long high, unsigned long low) |
942 | { | |
943 | #define HALF_LONG_BITS (BITS_PER_LONG / 2) | |
944 | return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low; | |
945 | } | |
946 | ||
f17d8b35 MT |
947 | static ssize_t do_preadv(unsigned long fd, const struct iovec __user *vec, |
948 | unsigned long vlen, loff_t pos, int flags) | |
f3554f4b | 949 | { |
2903ff01 | 950 | struct fd f; |
f3554f4b | 951 | ssize_t ret = -EBADF; |
f3554f4b GH |
952 | |
953 | if (pos < 0) | |
954 | return -EINVAL; | |
955 | ||
2903ff01 AV |
956 | f = fdget(fd); |
957 | if (f.file) { | |
f3554f4b | 958 | ret = -ESPIPE; |
2903ff01 | 959 | if (f.file->f_mode & FMODE_PREAD) |
f17d8b35 | 960 | ret = vfs_readv(f.file, vec, vlen, &pos, flags); |
2903ff01 | 961 | fdput(f); |
f3554f4b GH |
962 | } |
963 | ||
964 | if (ret > 0) | |
965 | add_rchar(current, ret); | |
966 | inc_syscr(current); | |
967 | return ret; | |
968 | } | |
969 | ||
f17d8b35 MT |
970 | static ssize_t do_pwritev(unsigned long fd, const struct iovec __user *vec, |
971 | unsigned long vlen, loff_t pos, int flags) | |
f3554f4b | 972 | { |
2903ff01 | 973 | struct fd f; |
f3554f4b | 974 | ssize_t ret = -EBADF; |
f3554f4b GH |
975 | |
976 | if (pos < 0) | |
977 | return -EINVAL; | |
978 | ||
2903ff01 AV |
979 | f = fdget(fd); |
980 | if (f.file) { | |
f3554f4b | 981 | ret = -ESPIPE; |
2903ff01 | 982 | if (f.file->f_mode & FMODE_PWRITE) |
f17d8b35 | 983 | ret = vfs_writev(f.file, vec, vlen, &pos, flags); |
2903ff01 | 984 | fdput(f); |
f3554f4b GH |
985 | } |
986 | ||
987 | if (ret > 0) | |
988 | add_wchar(current, ret); | |
989 | inc_syscw(current); | |
990 | return ret; | |
991 | } | |
992 | ||
f17d8b35 MT |
993 | SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, |
994 | unsigned long, vlen) | |
995 | { | |
996 | return do_readv(fd, vec, vlen, 0); | |
997 | } | |
998 | ||
999 | SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, | |
1000 | unsigned long, vlen) | |
1001 | { | |
1002 | return do_writev(fd, vec, vlen, 0); | |
1003 | } | |
1004 | ||
1005 | SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, | |
1006 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) | |
1007 | { | |
1008 | loff_t pos = pos_from_hilo(pos_h, pos_l); | |
1009 | ||
1010 | return do_preadv(fd, vec, vlen, pos, 0); | |
1011 | } | |
1012 | ||
1013 | SYSCALL_DEFINE6(preadv2, unsigned long, fd, const struct iovec __user *, vec, | |
1014 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h, | |
1015 | int, flags) | |
1016 | { | |
1017 | loff_t pos = pos_from_hilo(pos_h, pos_l); | |
1018 | ||
1019 | if (pos == -1) | |
1020 | return do_readv(fd, vec, vlen, flags); | |
1021 | ||
1022 | return do_preadv(fd, vec, vlen, pos, flags); | |
1023 | } | |
1024 | ||
1025 | SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, | |
1026 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) | |
1027 | { | |
1028 | loff_t pos = pos_from_hilo(pos_h, pos_l); | |
1029 | ||
1030 | return do_pwritev(fd, vec, vlen, pos, 0); | |
1031 | } | |
1032 | ||
1033 | SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec, | |
1034 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h, | |
1035 | int, flags) | |
1036 | { | |
1037 | loff_t pos = pos_from_hilo(pos_h, pos_l); | |
1038 | ||
1039 | if (pos == -1) | |
1040 | return do_writev(fd, vec, vlen, flags); | |
1041 | ||
1042 | return do_pwritev(fd, vec, vlen, pos, flags); | |
1043 | } | |
1044 | ||
72ec3516 AV |
1045 | #ifdef CONFIG_COMPAT |
1046 | ||
1047 | static ssize_t compat_do_readv_writev(int type, struct file *file, | |
1048 | const struct compat_iovec __user *uvector, | |
793b80ef CH |
1049 | unsigned long nr_segs, loff_t *pos, |
1050 | int flags) | |
72ec3516 AV |
1051 | { |
1052 | compat_ssize_t tot_len; | |
1053 | struct iovec iovstack[UIO_FASTIOV]; | |
1054 | struct iovec *iov = iovstack; | |
ac15ac06 | 1055 | struct iov_iter iter; |
72ec3516 AV |
1056 | ssize_t ret; |
1057 | io_fn_t fn; | |
293bc982 | 1058 | iter_fn_t iter_fn; |
72ec3516 | 1059 | |
0504c074 AV |
1060 | ret = compat_import_iovec(type, uvector, nr_segs, |
1061 | UIO_FASTIOV, &iov, &iter); | |
1062 | if (ret < 0) | |
1063 | return ret; | |
72ec3516 | 1064 | |
0504c074 AV |
1065 | tot_len = iov_iter_count(&iter); |
1066 | if (!tot_len) | |
1067 | goto out; | |
72ec3516 AV |
1068 | ret = rw_verify_area(type, file, pos, tot_len); |
1069 | if (ret < 0) | |
1070 | goto out; | |
1071 | ||
72ec3516 AV |
1072 | if (type == READ) { |
1073 | fn = file->f_op->read; | |
293bc982 | 1074 | iter_fn = file->f_op->read_iter; |
72ec3516 AV |
1075 | } else { |
1076 | fn = (io_fn_t)file->f_op->write; | |
293bc982 | 1077 | iter_fn = file->f_op->write_iter; |
03d95eb2 | 1078 | file_start_write(file); |
72ec3516 AV |
1079 | } |
1080 | ||
293bc982 | 1081 | if (iter_fn) |
793b80ef | 1082 | ret = do_iter_readv_writev(file, &iter, pos, iter_fn, flags); |
03d95eb2 | 1083 | else |
793b80ef | 1084 | ret = do_loop_readv_writev(file, &iter, pos, fn, flags); |
72ec3516 | 1085 | |
03d95eb2 AV |
1086 | if (type != READ) |
1087 | file_end_write(file); | |
1088 | ||
72ec3516 | 1089 | out: |
0504c074 | 1090 | kfree(iov); |
72ec3516 AV |
1091 | if ((ret + (type == READ)) > 0) { |
1092 | if (type == READ) | |
1093 | fsnotify_access(file); | |
1094 | else | |
1095 | fsnotify_modify(file); | |
1096 | } | |
1097 | return ret; | |
1098 | } | |
1099 | ||
1100 | static size_t compat_readv(struct file *file, | |
1101 | const struct compat_iovec __user *vec, | |
f17d8b35 | 1102 | unsigned long vlen, loff_t *pos, int flags) |
72ec3516 AV |
1103 | { |
1104 | ssize_t ret = -EBADF; | |
1105 | ||
1106 | if (!(file->f_mode & FMODE_READ)) | |
1107 | goto out; | |
1108 | ||
1109 | ret = -EINVAL; | |
7f7f25e8 | 1110 | if (!(file->f_mode & FMODE_CAN_READ)) |
72ec3516 AV |
1111 | goto out; |
1112 | ||
f17d8b35 | 1113 | ret = compat_do_readv_writev(READ, file, vec, vlen, pos, flags); |
72ec3516 AV |
1114 | |
1115 | out: | |
1116 | if (ret > 0) | |
1117 | add_rchar(current, ret); | |
1118 | inc_syscr(current); | |
1119 | return ret; | |
1120 | } | |
1121 | ||
f17d8b35 MT |
1122 | static size_t do_compat_readv(compat_ulong_t fd, |
1123 | const struct compat_iovec __user *vec, | |
1124 | compat_ulong_t vlen, int flags) | |
72ec3516 | 1125 | { |
9c225f26 | 1126 | struct fd f = fdget_pos(fd); |
72ec3516 AV |
1127 | ssize_t ret; |
1128 | loff_t pos; | |
1129 | ||
1130 | if (!f.file) | |
1131 | return -EBADF; | |
1132 | pos = f.file->f_pos; | |
f17d8b35 | 1133 | ret = compat_readv(f.file, vec, vlen, &pos, flags); |
5faf153e AV |
1134 | if (ret >= 0) |
1135 | f.file->f_pos = pos; | |
9c225f26 | 1136 | fdput_pos(f); |
72ec3516 | 1137 | return ret; |
f17d8b35 | 1138 | |
72ec3516 AV |
1139 | } |
1140 | ||
f17d8b35 MT |
1141 | COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, |
1142 | const struct compat_iovec __user *,vec, | |
1143 | compat_ulong_t, vlen) | |
1144 | { | |
1145 | return do_compat_readv(fd, vec, vlen, 0); | |
1146 | } | |
1147 | ||
1148 | static long do_compat_preadv64(unsigned long fd, | |
378a10f3 | 1149 | const struct compat_iovec __user *vec, |
f17d8b35 | 1150 | unsigned long vlen, loff_t pos, int flags) |
72ec3516 AV |
1151 | { |
1152 | struct fd f; | |
1153 | ssize_t ret; | |
1154 | ||
1155 | if (pos < 0) | |
1156 | return -EINVAL; | |
1157 | f = fdget(fd); | |
1158 | if (!f.file) | |
1159 | return -EBADF; | |
1160 | ret = -ESPIPE; | |
1161 | if (f.file->f_mode & FMODE_PREAD) | |
f17d8b35 | 1162 | ret = compat_readv(f.file, vec, vlen, &pos, flags); |
72ec3516 AV |
1163 | fdput(f); |
1164 | return ret; | |
1165 | } | |
1166 | ||
378a10f3 HC |
1167 | #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 |
1168 | COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, | |
1169 | const struct compat_iovec __user *,vec, | |
1170 | unsigned long, vlen, loff_t, pos) | |
1171 | { | |
f17d8b35 | 1172 | return do_compat_preadv64(fd, vec, vlen, pos, 0); |
378a10f3 HC |
1173 | } |
1174 | #endif | |
1175 | ||
dfd948e3 | 1176 | COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd, |
72ec3516 | 1177 | const struct compat_iovec __user *,vec, |
dfd948e3 | 1178 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
72ec3516 AV |
1179 | { |
1180 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; | |
378a10f3 | 1181 | |
f17d8b35 MT |
1182 | return do_compat_preadv64(fd, vec, vlen, pos, 0); |
1183 | } | |
1184 | ||
1185 | COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd, | |
1186 | const struct compat_iovec __user *,vec, | |
1187 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high, | |
1188 | int, flags) | |
1189 | { | |
1190 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; | |
1191 | ||
1192 | if (pos == -1) | |
1193 | return do_compat_readv(fd, vec, vlen, flags); | |
1194 | ||
1195 | return do_compat_preadv64(fd, vec, vlen, pos, flags); | |
72ec3516 AV |
1196 | } |
1197 | ||
1198 | static size_t compat_writev(struct file *file, | |
1199 | const struct compat_iovec __user *vec, | |
f17d8b35 | 1200 | unsigned long vlen, loff_t *pos, int flags) |
72ec3516 AV |
1201 | { |
1202 | ssize_t ret = -EBADF; | |
1203 | ||
1204 | if (!(file->f_mode & FMODE_WRITE)) | |
1205 | goto out; | |
1206 | ||
1207 | ret = -EINVAL; | |
7f7f25e8 | 1208 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
72ec3516 AV |
1209 | goto out; |
1210 | ||
793b80ef | 1211 | ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos, 0); |
72ec3516 AV |
1212 | |
1213 | out: | |
1214 | if (ret > 0) | |
1215 | add_wchar(current, ret); | |
1216 | inc_syscw(current); | |
1217 | return ret; | |
1218 | } | |
1219 | ||
f17d8b35 MT |
1220 | static size_t do_compat_writev(compat_ulong_t fd, |
1221 | const struct compat_iovec __user* vec, | |
1222 | compat_ulong_t vlen, int flags) | |
72ec3516 | 1223 | { |
9c225f26 | 1224 | struct fd f = fdget_pos(fd); |
72ec3516 AV |
1225 | ssize_t ret; |
1226 | loff_t pos; | |
1227 | ||
1228 | if (!f.file) | |
1229 | return -EBADF; | |
1230 | pos = f.file->f_pos; | |
f17d8b35 | 1231 | ret = compat_writev(f.file, vec, vlen, &pos, flags); |
5faf153e AV |
1232 | if (ret >= 0) |
1233 | f.file->f_pos = pos; | |
9c225f26 | 1234 | fdput_pos(f); |
72ec3516 AV |
1235 | return ret; |
1236 | } | |
1237 | ||
f17d8b35 MT |
1238 | COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, |
1239 | const struct compat_iovec __user *, vec, | |
1240 | compat_ulong_t, vlen) | |
1241 | { | |
1242 | return do_compat_writev(fd, vec, vlen, 0); | |
1243 | } | |
1244 | ||
1245 | static long do_compat_pwritev64(unsigned long fd, | |
378a10f3 | 1246 | const struct compat_iovec __user *vec, |
f17d8b35 | 1247 | unsigned long vlen, loff_t pos, int flags) |
72ec3516 AV |
1248 | { |
1249 | struct fd f; | |
1250 | ssize_t ret; | |
1251 | ||
1252 | if (pos < 0) | |
1253 | return -EINVAL; | |
1254 | f = fdget(fd); | |
1255 | if (!f.file) | |
1256 | return -EBADF; | |
1257 | ret = -ESPIPE; | |
1258 | if (f.file->f_mode & FMODE_PWRITE) | |
f17d8b35 | 1259 | ret = compat_writev(f.file, vec, vlen, &pos, flags); |
72ec3516 AV |
1260 | fdput(f); |
1261 | return ret; | |
1262 | } | |
1263 | ||
378a10f3 HC |
1264 | #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 |
1265 | COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, | |
1266 | const struct compat_iovec __user *,vec, | |
1267 | unsigned long, vlen, loff_t, pos) | |
1268 | { | |
f17d8b35 | 1269 | return do_compat_pwritev64(fd, vec, vlen, pos, 0); |
378a10f3 HC |
1270 | } |
1271 | #endif | |
1272 | ||
dfd948e3 | 1273 | COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd, |
72ec3516 | 1274 | const struct compat_iovec __user *,vec, |
dfd948e3 | 1275 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
72ec3516 AV |
1276 | { |
1277 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; | |
378a10f3 | 1278 | |
f17d8b35 | 1279 | return do_compat_pwritev64(fd, vec, vlen, pos, 0); |
72ec3516 | 1280 | } |
f17d8b35 MT |
1281 | |
1282 | COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd, | |
1283 | const struct compat_iovec __user *,vec, | |
1284 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high, int, flags) | |
1285 | { | |
1286 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; | |
1287 | ||
1288 | if (pos == -1) | |
1289 | return do_compat_writev(fd, vec, vlen, flags); | |
1290 | ||
1291 | return do_compat_pwritev64(fd, vec, vlen, pos, flags); | |
72ec3516 | 1292 | } |
f17d8b35 | 1293 | |
72ec3516 AV |
1294 | #endif |
1295 | ||
19f4fc3a AV |
1296 | static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, |
1297 | size_t count, loff_t max) | |
1da177e4 | 1298 | { |
2903ff01 AV |
1299 | struct fd in, out; |
1300 | struct inode *in_inode, *out_inode; | |
1da177e4 | 1301 | loff_t pos; |
7995bd28 | 1302 | loff_t out_pos; |
1da177e4 | 1303 | ssize_t retval; |
2903ff01 | 1304 | int fl; |
1da177e4 LT |
1305 | |
1306 | /* | |
1307 | * Get input file, and verify that it is ok.. | |
1308 | */ | |
1309 | retval = -EBADF; | |
2903ff01 AV |
1310 | in = fdget(in_fd); |
1311 | if (!in.file) | |
1da177e4 | 1312 | goto out; |
2903ff01 | 1313 | if (!(in.file->f_mode & FMODE_READ)) |
1da177e4 | 1314 | goto fput_in; |
1da177e4 | 1315 | retval = -ESPIPE; |
7995bd28 AV |
1316 | if (!ppos) { |
1317 | pos = in.file->f_pos; | |
1318 | } else { | |
1319 | pos = *ppos; | |
2903ff01 | 1320 | if (!(in.file->f_mode & FMODE_PREAD)) |
1da177e4 | 1321 | goto fput_in; |
7995bd28 AV |
1322 | } |
1323 | retval = rw_verify_area(READ, in.file, &pos, count); | |
e28cc715 | 1324 | if (retval < 0) |
1da177e4 | 1325 | goto fput_in; |
e28cc715 | 1326 | count = retval; |
1da177e4 | 1327 | |
1da177e4 LT |
1328 | /* |
1329 | * Get output file, and verify that it is ok.. | |
1330 | */ | |
1331 | retval = -EBADF; | |
2903ff01 AV |
1332 | out = fdget(out_fd); |
1333 | if (!out.file) | |
1da177e4 | 1334 | goto fput_in; |
2903ff01 | 1335 | if (!(out.file->f_mode & FMODE_WRITE)) |
1da177e4 LT |
1336 | goto fput_out; |
1337 | retval = -EINVAL; | |
496ad9aa AV |
1338 | in_inode = file_inode(in.file); |
1339 | out_inode = file_inode(out.file); | |
7995bd28 AV |
1340 | out_pos = out.file->f_pos; |
1341 | retval = rw_verify_area(WRITE, out.file, &out_pos, count); | |
e28cc715 | 1342 | if (retval < 0) |
1da177e4 | 1343 | goto fput_out; |
e28cc715 | 1344 | count = retval; |
1da177e4 | 1345 | |
1da177e4 LT |
1346 | if (!max) |
1347 | max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); | |
1348 | ||
1da177e4 LT |
1349 | if (unlikely(pos + count > max)) { |
1350 | retval = -EOVERFLOW; | |
1351 | if (pos >= max) | |
1352 | goto fput_out; | |
1353 | count = max - pos; | |
1354 | } | |
1355 | ||
d96e6e71 | 1356 | fl = 0; |
534f2aaa | 1357 | #if 0 |
d96e6e71 JA |
1358 | /* |
1359 | * We need to debate whether we can enable this or not. The | |
1360 | * man page documents EAGAIN return for the output at least, | |
1361 | * and the application is arguably buggy if it doesn't expect | |
1362 | * EAGAIN on a non-blocking file descriptor. | |
1363 | */ | |
2903ff01 | 1364 | if (in.file->f_flags & O_NONBLOCK) |
d96e6e71 | 1365 | fl = SPLICE_F_NONBLOCK; |
534f2aaa | 1366 | #endif |
50cd2c57 | 1367 | file_start_write(out.file); |
7995bd28 | 1368 | retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl); |
50cd2c57 | 1369 | file_end_write(out.file); |
1da177e4 LT |
1370 | |
1371 | if (retval > 0) { | |
4b98d11b AD |
1372 | add_rchar(current, retval); |
1373 | add_wchar(current, retval); | |
a68c2f12 SW |
1374 | fsnotify_access(in.file); |
1375 | fsnotify_modify(out.file); | |
7995bd28 AV |
1376 | out.file->f_pos = out_pos; |
1377 | if (ppos) | |
1378 | *ppos = pos; | |
1379 | else | |
1380 | in.file->f_pos = pos; | |
1da177e4 | 1381 | } |
1da177e4 | 1382 | |
4b98d11b AD |
1383 | inc_syscr(current); |
1384 | inc_syscw(current); | |
7995bd28 | 1385 | if (pos > max) |
1da177e4 LT |
1386 | retval = -EOVERFLOW; |
1387 | ||
1388 | fput_out: | |
2903ff01 | 1389 | fdput(out); |
1da177e4 | 1390 | fput_in: |
2903ff01 | 1391 | fdput(in); |
1da177e4 LT |
1392 | out: |
1393 | return retval; | |
1394 | } | |
1395 | ||
002c8976 | 1396 | SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_t, count) |
1da177e4 LT |
1397 | { |
1398 | loff_t pos; | |
1399 | off_t off; | |
1400 | ssize_t ret; | |
1401 | ||
1402 | if (offset) { | |
1403 | if (unlikely(get_user(off, offset))) | |
1404 | return -EFAULT; | |
1405 | pos = off; | |
1406 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); | |
1407 | if (unlikely(put_user(pos, offset))) | |
1408 | return -EFAULT; | |
1409 | return ret; | |
1410 | } | |
1411 | ||
1412 | return do_sendfile(out_fd, in_fd, NULL, count, 0); | |
1413 | } | |
1414 | ||
002c8976 | 1415 | SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count) |
1da177e4 LT |
1416 | { |
1417 | loff_t pos; | |
1418 | ssize_t ret; | |
1419 | ||
1420 | if (offset) { | |
1421 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) | |
1422 | return -EFAULT; | |
1423 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); | |
1424 | if (unlikely(put_user(pos, offset))) | |
1425 | return -EFAULT; | |
1426 | return ret; | |
1427 | } | |
1428 | ||
1429 | return do_sendfile(out_fd, in_fd, NULL, count, 0); | |
1430 | } | |
19f4fc3a AV |
1431 | |
1432 | #ifdef CONFIG_COMPAT | |
1433 | COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, | |
1434 | compat_off_t __user *, offset, compat_size_t, count) | |
1435 | { | |
1436 | loff_t pos; | |
1437 | off_t off; | |
1438 | ssize_t ret; | |
1439 | ||
1440 | if (offset) { | |
1441 | if (unlikely(get_user(off, offset))) | |
1442 | return -EFAULT; | |
1443 | pos = off; | |
1444 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); | |
1445 | if (unlikely(put_user(pos, offset))) | |
1446 | return -EFAULT; | |
1447 | return ret; | |
1448 | } | |
1449 | ||
1450 | return do_sendfile(out_fd, in_fd, NULL, count, 0); | |
1451 | } | |
1452 | ||
1453 | COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, | |
1454 | compat_loff_t __user *, offset, compat_size_t, count) | |
1455 | { | |
1456 | loff_t pos; | |
1457 | ssize_t ret; | |
1458 | ||
1459 | if (offset) { | |
1460 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) | |
1461 | return -EFAULT; | |
1462 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); | |
1463 | if (unlikely(put_user(pos, offset))) | |
1464 | return -EFAULT; | |
1465 | return ret; | |
1466 | } | |
1467 | ||
1468 | return do_sendfile(out_fd, in_fd, NULL, count, 0); | |
1469 | } | |
1470 | #endif | |
29732938 ZB |
1471 | |
1472 | /* | |
1473 | * copy_file_range() differs from regular file read and write in that it | |
1474 | * specifically allows return partial success. When it does so is up to | |
1475 | * the copy_file_range method. | |
1476 | */ | |
1477 | ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in, | |
1478 | struct file *file_out, loff_t pos_out, | |
1479 | size_t len, unsigned int flags) | |
1480 | { | |
1481 | struct inode *inode_in = file_inode(file_in); | |
1482 | struct inode *inode_out = file_inode(file_out); | |
1483 | ssize_t ret; | |
1484 | ||
1485 | if (flags != 0) | |
1486 | return -EINVAL; | |
1487 | ||
1488 | /* copy_file_range allows full ssize_t len, ignoring MAX_RW_COUNT */ | |
1489 | ret = rw_verify_area(READ, file_in, &pos_in, len); | |
1490 | if (ret >= 0) | |
1491 | ret = rw_verify_area(WRITE, file_out, &pos_out, len); | |
1492 | if (ret < 0) | |
1493 | return ret; | |
1494 | ||
1495 | if (!(file_in->f_mode & FMODE_READ) || | |
1496 | !(file_out->f_mode & FMODE_WRITE) || | |
eac70053 | 1497 | (file_out->f_flags & O_APPEND)) |
29732938 ZB |
1498 | return -EBADF; |
1499 | ||
1500 | /* this could be relaxed once a method supports cross-fs copies */ | |
1501 | if (inode_in->i_sb != inode_out->i_sb) | |
1502 | return -EXDEV; | |
1503 | ||
1504 | if (len == 0) | |
1505 | return 0; | |
1506 | ||
1507 | ret = mnt_want_write_file(file_out); | |
1508 | if (ret) | |
1509 | return ret; | |
1510 | ||
eac70053 AS |
1511 | ret = -EOPNOTSUPP; |
1512 | if (file_out->f_op->copy_file_range) | |
1513 | ret = file_out->f_op->copy_file_range(file_in, pos_in, file_out, | |
1514 | pos_out, len, flags); | |
1515 | if (ret == -EOPNOTSUPP) | |
1516 | ret = do_splice_direct(file_in, &pos_in, file_out, &pos_out, | |
1517 | len > MAX_RW_COUNT ? MAX_RW_COUNT : len, 0); | |
1518 | ||
29732938 ZB |
1519 | if (ret > 0) { |
1520 | fsnotify_access(file_in); | |
1521 | add_rchar(current, ret); | |
1522 | fsnotify_modify(file_out); | |
1523 | add_wchar(current, ret); | |
1524 | } | |
1525 | inc_syscr(current); | |
1526 | inc_syscw(current); | |
1527 | ||
1528 | mnt_drop_write_file(file_out); | |
1529 | ||
1530 | return ret; | |
1531 | } | |
1532 | EXPORT_SYMBOL(vfs_copy_file_range); | |
1533 | ||
1534 | SYSCALL_DEFINE6(copy_file_range, int, fd_in, loff_t __user *, off_in, | |
1535 | int, fd_out, loff_t __user *, off_out, | |
1536 | size_t, len, unsigned int, flags) | |
1537 | { | |
1538 | loff_t pos_in; | |
1539 | loff_t pos_out; | |
1540 | struct fd f_in; | |
1541 | struct fd f_out; | |
1542 | ssize_t ret = -EBADF; | |
1543 | ||
1544 | f_in = fdget(fd_in); | |
1545 | if (!f_in.file) | |
1546 | goto out2; | |
1547 | ||
1548 | f_out = fdget(fd_out); | |
1549 | if (!f_out.file) | |
1550 | goto out1; | |
1551 | ||
1552 | ret = -EFAULT; | |
1553 | if (off_in) { | |
1554 | if (copy_from_user(&pos_in, off_in, sizeof(loff_t))) | |
1555 | goto out; | |
1556 | } else { | |
1557 | pos_in = f_in.file->f_pos; | |
1558 | } | |
1559 | ||
1560 | if (off_out) { | |
1561 | if (copy_from_user(&pos_out, off_out, sizeof(loff_t))) | |
1562 | goto out; | |
1563 | } else { | |
1564 | pos_out = f_out.file->f_pos; | |
1565 | } | |
1566 | ||
1567 | ret = vfs_copy_file_range(f_in.file, pos_in, f_out.file, pos_out, len, | |
1568 | flags); | |
1569 | if (ret > 0) { | |
1570 | pos_in += ret; | |
1571 | pos_out += ret; | |
1572 | ||
1573 | if (off_in) { | |
1574 | if (copy_to_user(off_in, &pos_in, sizeof(loff_t))) | |
1575 | ret = -EFAULT; | |
1576 | } else { | |
1577 | f_in.file->f_pos = pos_in; | |
1578 | } | |
1579 | ||
1580 | if (off_out) { | |
1581 | if (copy_to_user(off_out, &pos_out, sizeof(loff_t))) | |
1582 | ret = -EFAULT; | |
1583 | } else { | |
1584 | f_out.file->f_pos = pos_out; | |
1585 | } | |
1586 | } | |
1587 | ||
1588 | out: | |
1589 | fdput(f_out); | |
1590 | out1: | |
1591 | fdput(f_in); | |
1592 | out2: | |
1593 | return ret; | |
1594 | } | |
04b38d60 CH |
1595 | |
1596 | static int clone_verify_area(struct file *file, loff_t pos, u64 len, bool write) | |
1597 | { | |
1598 | struct inode *inode = file_inode(file); | |
1599 | ||
1600 | if (unlikely(pos < 0)) | |
1601 | return -EINVAL; | |
1602 | ||
1603 | if (unlikely((loff_t) (pos + len) < 0)) | |
1604 | return -EINVAL; | |
1605 | ||
1606 | if (unlikely(inode->i_flctx && mandatory_lock(inode))) { | |
1607 | loff_t end = len ? pos + len - 1 : OFFSET_MAX; | |
1608 | int retval; | |
1609 | ||
1610 | retval = locks_mandatory_area(inode, file, pos, end, | |
1611 | write ? F_WRLCK : F_RDLCK); | |
1612 | if (retval < 0) | |
1613 | return retval; | |
1614 | } | |
1615 | ||
1616 | return security_file_permission(file, write ? MAY_WRITE : MAY_READ); | |
1617 | } | |
1618 | ||
1619 | int vfs_clone_file_range(struct file *file_in, loff_t pos_in, | |
1620 | struct file *file_out, loff_t pos_out, u64 len) | |
1621 | { | |
1622 | struct inode *inode_in = file_inode(file_in); | |
1623 | struct inode *inode_out = file_inode(file_out); | |
1624 | int ret; | |
1625 | ||
1626 | if (inode_in->i_sb != inode_out->i_sb || | |
1627 | file_in->f_path.mnt != file_out->f_path.mnt) | |
1628 | return -EXDEV; | |
1629 | ||
1630 | if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) | |
1631 | return -EISDIR; | |
1632 | if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) | |
d79bdd52 | 1633 | return -EINVAL; |
04b38d60 CH |
1634 | |
1635 | if (!(file_in->f_mode & FMODE_READ) || | |
1636 | !(file_out->f_mode & FMODE_WRITE) || | |
0fcbf996 | 1637 | (file_out->f_flags & O_APPEND)) |
04b38d60 CH |
1638 | return -EBADF; |
1639 | ||
0fcbf996 CH |
1640 | if (!file_in->f_op->clone_file_range) |
1641 | return -EOPNOTSUPP; | |
1642 | ||
04b38d60 CH |
1643 | ret = clone_verify_area(file_in, pos_in, len, false); |
1644 | if (ret) | |
1645 | return ret; | |
1646 | ||
1647 | ret = clone_verify_area(file_out, pos_out, len, true); | |
1648 | if (ret) | |
1649 | return ret; | |
1650 | ||
1651 | if (pos_in + len > i_size_read(inode_in)) | |
1652 | return -EINVAL; | |
1653 | ||
1654 | ret = mnt_want_write_file(file_out); | |
1655 | if (ret) | |
1656 | return ret; | |
1657 | ||
1658 | ret = file_in->f_op->clone_file_range(file_in, pos_in, | |
1659 | file_out, pos_out, len); | |
1660 | if (!ret) { | |
1661 | fsnotify_access(file_in); | |
1662 | fsnotify_modify(file_out); | |
1663 | } | |
1664 | ||
1665 | mnt_drop_write_file(file_out); | |
1666 | return ret; | |
1667 | } | |
1668 | EXPORT_SYMBOL(vfs_clone_file_range); | |
54dbc151 DW |
1669 | |
1670 | int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same) | |
1671 | { | |
1672 | struct file_dedupe_range_info *info; | |
1673 | struct inode *src = file_inode(file); | |
1674 | u64 off; | |
1675 | u64 len; | |
1676 | int i; | |
1677 | int ret; | |
1678 | bool is_admin = capable(CAP_SYS_ADMIN); | |
1679 | u16 count = same->dest_count; | |
1680 | struct file *dst_file; | |
1681 | loff_t dst_off; | |
1682 | ssize_t deduped; | |
1683 | ||
1684 | if (!(file->f_mode & FMODE_READ)) | |
1685 | return -EINVAL; | |
1686 | ||
1687 | if (same->reserved1 || same->reserved2) | |
1688 | return -EINVAL; | |
1689 | ||
1690 | off = same->src_offset; | |
1691 | len = same->src_length; | |
1692 | ||
1693 | ret = -EISDIR; | |
1694 | if (S_ISDIR(src->i_mode)) | |
1695 | goto out; | |
1696 | ||
1697 | ret = -EINVAL; | |
1698 | if (!S_ISREG(src->i_mode)) | |
1699 | goto out; | |
1700 | ||
1701 | ret = clone_verify_area(file, off, len, false); | |
1702 | if (ret < 0) | |
1703 | goto out; | |
1704 | ret = 0; | |
1705 | ||
1706 | /* pre-format output fields to sane values */ | |
1707 | for (i = 0; i < count; i++) { | |
1708 | same->info[i].bytes_deduped = 0ULL; | |
1709 | same->info[i].status = FILE_DEDUPE_RANGE_SAME; | |
1710 | } | |
1711 | ||
1712 | for (i = 0, info = same->info; i < count; i++, info++) { | |
1713 | struct inode *dst; | |
1714 | struct fd dst_fd = fdget(info->dest_fd); | |
1715 | ||
1716 | dst_file = dst_fd.file; | |
1717 | if (!dst_file) { | |
1718 | info->status = -EBADF; | |
1719 | goto next_loop; | |
1720 | } | |
1721 | dst = file_inode(dst_file); | |
1722 | ||
1723 | ret = mnt_want_write_file(dst_file); | |
1724 | if (ret) { | |
1725 | info->status = ret; | |
1726 | goto next_loop; | |
1727 | } | |
1728 | ||
1729 | dst_off = info->dest_offset; | |
1730 | ret = clone_verify_area(dst_file, dst_off, len, true); | |
1731 | if (ret < 0) { | |
1732 | info->status = ret; | |
1733 | goto next_file; | |
1734 | } | |
1735 | ret = 0; | |
1736 | ||
1737 | if (info->reserved) { | |
1738 | info->status = -EINVAL; | |
1739 | } else if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) { | |
1740 | info->status = -EINVAL; | |
1741 | } else if (file->f_path.mnt != dst_file->f_path.mnt) { | |
1742 | info->status = -EXDEV; | |
1743 | } else if (S_ISDIR(dst->i_mode)) { | |
1744 | info->status = -EISDIR; | |
1745 | } else if (dst_file->f_op->dedupe_file_range == NULL) { | |
1746 | info->status = -EINVAL; | |
1747 | } else { | |
1748 | deduped = dst_file->f_op->dedupe_file_range(file, off, | |
1749 | len, dst_file, | |
1750 | info->dest_offset); | |
1751 | if (deduped == -EBADE) | |
1752 | info->status = FILE_DEDUPE_RANGE_DIFFERS; | |
1753 | else if (deduped < 0) | |
1754 | info->status = deduped; | |
1755 | else | |
1756 | info->bytes_deduped += deduped; | |
1757 | } | |
1758 | ||
1759 | next_file: | |
1760 | mnt_drop_write_file(dst_file); | |
1761 | next_loop: | |
1762 | fdput(dst_fd); | |
e62e560f DW |
1763 | |
1764 | if (fatal_signal_pending(current)) | |
1765 | goto out; | |
54dbc151 DW |
1766 | } |
1767 | ||
1768 | out: | |
1769 | return ret; | |
1770 | } | |
1771 | EXPORT_SYMBOL(vfs_dedupe_file_range); |