Root/
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> |
12 | #include <linux/aio.h> |
13 | #include <linux/fsnotify.h> |
14 | #include <linux/security.h> |
15 | #include <linux/export.h> |
16 | #include <linux/syscalls.h> |
17 | #include <linux/pagemap.h> |
18 | #include <linux/splice.h> |
19 | #include <linux/compat.h> |
20 | #include "internal.h" |
21 | |
22 | #include <asm/uaccess.h> |
23 | #include <asm/unistd.h> |
24 | |
25 | typedef ssize_t (*io_fn_t)(struct file *, char __user *, size_t, loff_t *); |
26 | typedef ssize_t (*iov_fn_t)(struct kiocb *, const struct iovec *, |
27 | unsigned long, loff_t); |
28 | typedef ssize_t (*iter_fn_t)(struct kiocb *, struct iov_iter *); |
29 | |
30 | const struct file_operations generic_ro_fops = { |
31 | .llseek = generic_file_llseek, |
32 | .read = new_sync_read, |
33 | .read_iter = generic_file_read_iter, |
34 | .mmap = generic_file_readonly_mmap, |
35 | .splice_read = generic_file_splice_read, |
36 | }; |
37 | |
38 | EXPORT_SYMBOL(generic_ro_fops); |
39 | |
40 | static inline int unsigned_offsets(struct file *file) |
41 | { |
42 | return file->f_mode & FMODE_UNSIGNED_OFFSET; |
43 | } |
44 | |
45 | /** |
46 | * vfs_setpos - update the file offset for lseek |
47 | * @file: file structure in question |
48 | * @offset: file offset to seek to |
49 | * @maxsize: maximum file size |
50 | * |
51 | * This is a low-level filesystem helper for updating the file offset to |
52 | * the value specified by @offset if the given offset is valid and it is |
53 | * not equal to the current file offset. |
54 | * |
55 | * Return the specified offset on success and -EINVAL on invalid offset. |
56 | */ |
57 | loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize) |
58 | { |
59 | if (offset < 0 && !unsigned_offsets(file)) |
60 | return -EINVAL; |
61 | if (offset > maxsize) |
62 | return -EINVAL; |
63 | |
64 | if (offset != file->f_pos) { |
65 | file->f_pos = offset; |
66 | file->f_version = 0; |
67 | } |
68 | return offset; |
69 | } |
70 | EXPORT_SYMBOL(vfs_setpos); |
71 | |
72 | /** |
73 | * generic_file_llseek_size - generic llseek implementation for regular files |
74 | * @file: file structure to seek on |
75 | * @offset: file offset to seek to |
76 | * @whence: type of seek |
77 | * @size: max size of this file in file system |
78 | * @eof: offset used for SEEK_END position |
79 | * |
80 | * This is a variant of generic_file_llseek that allows passing in a custom |
81 | * maximum file size and a custom EOF position, for e.g. hashed directories |
82 | * |
83 | * Synchronization: |
84 | * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms) |
85 | * SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes. |
86 | * read/writes behave like SEEK_SET against seeks. |
87 | */ |
88 | loff_t |
89 | generic_file_llseek_size(struct file *file, loff_t offset, int whence, |
90 | loff_t maxsize, loff_t eof) |
91 | { |
92 | switch (whence) { |
93 | case SEEK_END: |
94 | offset += eof; |
95 | break; |
96 | case SEEK_CUR: |
97 | /* |
98 | * Here we special-case the lseek(fd, 0, SEEK_CUR) |
99 | * position-querying operation. Avoid rewriting the "same" |
100 | * f_pos value back to the file because a concurrent read(), |
101 | * write() or lseek() might have altered it |
102 | */ |
103 | if (offset == 0) |
104 | return file->f_pos; |
105 | /* |
106 | * f_lock protects against read/modify/write race with other |
107 | * SEEK_CURs. Note that parallel writes and reads behave |
108 | * like SEEK_SET. |
109 | */ |
110 | spin_lock(&file->f_lock); |
111 | offset = vfs_setpos(file, file->f_pos + offset, maxsize); |
112 | spin_unlock(&file->f_lock); |
113 | return offset; |
114 | case SEEK_DATA: |
115 | /* |
116 | * In the generic case the entire file is data, so as long as |
117 | * offset isn't at the end of the file then the offset is data. |
118 | */ |
119 | if (offset >= eof) |
120 | return -ENXIO; |
121 | break; |
122 | case SEEK_HOLE: |
123 | /* |
124 | * There is a virtual hole at the end of the file, so as long as |
125 | * offset isn't i_size or larger, return i_size. |
126 | */ |
127 | if (offset >= eof) |
128 | return -ENXIO; |
129 | offset = eof; |
130 | break; |
131 | } |
132 | |
133 | return vfs_setpos(file, offset, maxsize); |
134 | } |
135 | EXPORT_SYMBOL(generic_file_llseek_size); |
136 | |
137 | /** |
138 | * generic_file_llseek - generic llseek implementation for regular files |
139 | * @file: file structure to seek on |
140 | * @offset: file offset to seek to |
141 | * @whence: type of seek |
142 | * |
143 | * This is a generic implemenation of ->llseek useable for all normal local |
144 | * filesystems. It just updates the file offset to the value specified by |
145 | * @offset and @whence. |
146 | */ |
147 | loff_t generic_file_llseek(struct file *file, loff_t offset, int whence) |
148 | { |
149 | struct inode *inode = file->f_mapping->host; |
150 | |
151 | return generic_file_llseek_size(file, offset, whence, |
152 | inode->i_sb->s_maxbytes, |
153 | i_size_read(inode)); |
154 | } |
155 | EXPORT_SYMBOL(generic_file_llseek); |
156 | |
157 | /** |
158 | * fixed_size_llseek - llseek implementation for fixed-sized devices |
159 | * @file: file structure to seek on |
160 | * @offset: file offset to seek to |
161 | * @whence: type of seek |
162 | * @size: size of the file |
163 | * |
164 | */ |
165 | loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size) |
166 | { |
167 | switch (whence) { |
168 | case SEEK_SET: case SEEK_CUR: case SEEK_END: |
169 | return generic_file_llseek_size(file, offset, whence, |
170 | size, size); |
171 | default: |
172 | return -EINVAL; |
173 | } |
174 | } |
175 | EXPORT_SYMBOL(fixed_size_llseek); |
176 | |
177 | /** |
178 | * noop_llseek - No Operation Performed llseek implementation |
179 | * @file: file structure to seek on |
180 | * @offset: file offset to seek to |
181 | * @whence: type of seek |
182 | * |
183 | * This is an implementation of ->llseek useable for the rare special case when |
184 | * userspace expects the seek to succeed but the (device) file is actually not |
185 | * able to perform the seek. In this case you use noop_llseek() instead of |
186 | * falling back to the default implementation of ->llseek. |
187 | */ |
188 | loff_t noop_llseek(struct file *file, loff_t offset, int whence) |
189 | { |
190 | return file->f_pos; |
191 | } |
192 | EXPORT_SYMBOL(noop_llseek); |
193 | |
194 | loff_t no_llseek(struct file *file, loff_t offset, int whence) |
195 | { |
196 | return -ESPIPE; |
197 | } |
198 | EXPORT_SYMBOL(no_llseek); |
199 | |
200 | loff_t default_llseek(struct file *file, loff_t offset, int whence) |
201 | { |
202 | struct inode *inode = file_inode(file); |
203 | loff_t retval; |
204 | |
205 | mutex_lock(&inode->i_mutex); |
206 | switch (whence) { |
207 | case SEEK_END: |
208 | offset += i_size_read(inode); |
209 | break; |
210 | case SEEK_CUR: |
211 | if (offset == 0) { |
212 | retval = file->f_pos; |
213 | goto out; |
214 | } |
215 | offset += file->f_pos; |
216 | break; |
217 | case SEEK_DATA: |
218 | /* |
219 | * In the generic case the entire file is data, so as |
220 | * long as offset isn't at the end of the file then the |
221 | * offset is data. |
222 | */ |
223 | if (offset >= inode->i_size) { |
224 | retval = -ENXIO; |
225 | goto out; |
226 | } |
227 | break; |
228 | case SEEK_HOLE: |
229 | /* |
230 | * There is a virtual hole at the end of the file, so |
231 | * as long as offset isn't i_size or larger, return |
232 | * i_size. |
233 | */ |
234 | if (offset >= inode->i_size) { |
235 | retval = -ENXIO; |
236 | goto out; |
237 | } |
238 | offset = inode->i_size; |
239 | break; |
240 | } |
241 | retval = -EINVAL; |
242 | if (offset >= 0 || unsigned_offsets(file)) { |
243 | if (offset != file->f_pos) { |
244 | file->f_pos = offset; |
245 | file->f_version = 0; |
246 | } |
247 | retval = offset; |
248 | } |
249 | out: |
250 | mutex_unlock(&inode->i_mutex); |
251 | return retval; |
252 | } |
253 | EXPORT_SYMBOL(default_llseek); |
254 | |
255 | loff_t vfs_llseek(struct file *file, loff_t offset, int whence) |
256 | { |
257 | loff_t (*fn)(struct file *, loff_t, int); |
258 | |
259 | fn = no_llseek; |
260 | if (file->f_mode & FMODE_LSEEK) { |
261 | if (file->f_op->llseek) |
262 | fn = file->f_op->llseek; |
263 | } |
264 | return fn(file, offset, whence); |
265 | } |
266 | EXPORT_SYMBOL(vfs_llseek); |
267 | |
268 | static inline struct fd fdget_pos(int fd) |
269 | { |
270 | return __to_fd(__fdget_pos(fd)); |
271 | } |
272 | |
273 | static inline void fdput_pos(struct fd f) |
274 | { |
275 | if (f.flags & FDPUT_POS_UNLOCK) |
276 | mutex_unlock(&f.file->f_pos_lock); |
277 | fdput(f); |
278 | } |
279 | |
280 | SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence) |
281 | { |
282 | off_t retval; |
283 | struct fd f = fdget_pos(fd); |
284 | if (!f.file) |
285 | return -EBADF; |
286 | |
287 | retval = -EINVAL; |
288 | if (whence <= SEEK_MAX) { |
289 | loff_t res = vfs_llseek(f.file, offset, whence); |
290 | retval = res; |
291 | if (res != (loff_t)retval) |
292 | retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */ |
293 | } |
294 | fdput_pos(f); |
295 | return retval; |
296 | } |
297 | |
298 | #ifdef CONFIG_COMPAT |
299 | COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence) |
300 | { |
301 | return sys_lseek(fd, offset, whence); |
302 | } |
303 | #endif |
304 | |
305 | #ifdef __ARCH_WANT_SYS_LLSEEK |
306 | SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high, |
307 | unsigned long, offset_low, loff_t __user *, result, |
308 | unsigned int, whence) |
309 | { |
310 | int retval; |
311 | struct fd f = fdget_pos(fd); |
312 | loff_t offset; |
313 | |
314 | if (!f.file) |
315 | return -EBADF; |
316 | |
317 | retval = -EINVAL; |
318 | if (whence > SEEK_MAX) |
319 | goto out_putf; |
320 | |
321 | offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low, |
322 | whence); |
323 | |
324 | retval = (int)offset; |
325 | if (offset >= 0) { |
326 | retval = -EFAULT; |
327 | if (!copy_to_user(result, &offset, sizeof(offset))) |
328 | retval = 0; |
329 | } |
330 | out_putf: |
331 | fdput_pos(f); |
332 | return retval; |
333 | } |
334 | #endif |
335 | |
336 | /* |
337 | * rw_verify_area doesn't like huge counts. We limit |
338 | * them to something that fits in "int" so that others |
339 | * won't have to do range checks all the time. |
340 | */ |
341 | int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count) |
342 | { |
343 | struct inode *inode; |
344 | loff_t pos; |
345 | int retval = -EINVAL; |
346 | |
347 | inode = file_inode(file); |
348 | if (unlikely((ssize_t) count < 0)) |
349 | return retval; |
350 | pos = *ppos; |
351 | if (unlikely(pos < 0)) { |
352 | if (!unsigned_offsets(file)) |
353 | return retval; |
354 | if (count >= -pos) /* both values are in 0..LLONG_MAX */ |
355 | return -EOVERFLOW; |
356 | } else if (unlikely((loff_t) (pos + count) < 0)) { |
357 | if (!unsigned_offsets(file)) |
358 | return retval; |
359 | } |
360 | |
361 | if (unlikely(inode->i_flock && mandatory_lock(inode))) { |
362 | retval = locks_mandatory_area( |
363 | read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE, |
364 | inode, file, pos, count); |
365 | if (retval < 0) |
366 | return retval; |
367 | } |
368 | retval = security_file_permission(file, |
369 | read_write == READ ? MAY_READ : MAY_WRITE); |
370 | if (retval) |
371 | return retval; |
372 | return count > MAX_RW_COUNT ? MAX_RW_COUNT : count; |
373 | } |
374 | |
375 | ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) |
376 | { |
377 | struct iovec iov = { .iov_base = buf, .iov_len = len }; |
378 | struct kiocb kiocb; |
379 | ssize_t ret; |
380 | |
381 | init_sync_kiocb(&kiocb, filp); |
382 | kiocb.ki_pos = *ppos; |
383 | kiocb.ki_nbytes = len; |
384 | |
385 | ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos); |
386 | if (-EIOCBQUEUED == ret) |
387 | ret = wait_on_sync_kiocb(&kiocb); |
388 | *ppos = kiocb.ki_pos; |
389 | return ret; |
390 | } |
391 | |
392 | EXPORT_SYMBOL(do_sync_read); |
393 | |
394 | ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos) |
395 | { |
396 | struct iovec iov = { .iov_base = buf, .iov_len = len }; |
397 | struct kiocb kiocb; |
398 | struct iov_iter iter; |
399 | ssize_t ret; |
400 | |
401 | init_sync_kiocb(&kiocb, filp); |
402 | kiocb.ki_pos = *ppos; |
403 | kiocb.ki_nbytes = len; |
404 | iov_iter_init(&iter, READ, &iov, 1, len); |
405 | |
406 | ret = filp->f_op->read_iter(&kiocb, &iter); |
407 | if (-EIOCBQUEUED == ret) |
408 | ret = wait_on_sync_kiocb(&kiocb); |
409 | *ppos = kiocb.ki_pos; |
410 | return ret; |
411 | } |
412 | |
413 | EXPORT_SYMBOL(new_sync_read); |
414 | |
415 | ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) |
416 | { |
417 | ssize_t ret; |
418 | |
419 | if (!(file->f_mode & FMODE_READ)) |
420 | return -EBADF; |
421 | if (!(file->f_mode & FMODE_CAN_READ)) |
422 | return -EINVAL; |
423 | if (unlikely(!access_ok(VERIFY_WRITE, buf, count))) |
424 | return -EFAULT; |
425 | |
426 | ret = rw_verify_area(READ, file, pos, count); |
427 | if (ret >= 0) { |
428 | count = ret; |
429 | if (file->f_op->read) |
430 | ret = file->f_op->read(file, buf, count, pos); |
431 | else if (file->f_op->aio_read) |
432 | ret = do_sync_read(file, buf, count, pos); |
433 | else |
434 | ret = new_sync_read(file, buf, count, pos); |
435 | if (ret > 0) { |
436 | fsnotify_access(file); |
437 | add_rchar(current, ret); |
438 | } |
439 | inc_syscr(current); |
440 | } |
441 | |
442 | return ret; |
443 | } |
444 | |
445 | EXPORT_SYMBOL(vfs_read); |
446 | |
447 | ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) |
448 | { |
449 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; |
450 | struct kiocb kiocb; |
451 | ssize_t ret; |
452 | |
453 | init_sync_kiocb(&kiocb, filp); |
454 | kiocb.ki_pos = *ppos; |
455 | kiocb.ki_nbytes = len; |
456 | |
457 | ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos); |
458 | if (-EIOCBQUEUED == ret) |
459 | ret = wait_on_sync_kiocb(&kiocb); |
460 | *ppos = kiocb.ki_pos; |
461 | return ret; |
462 | } |
463 | |
464 | EXPORT_SYMBOL(do_sync_write); |
465 | |
466 | ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) |
467 | { |
468 | struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len }; |
469 | struct kiocb kiocb; |
470 | struct iov_iter iter; |
471 | ssize_t ret; |
472 | |
473 | init_sync_kiocb(&kiocb, filp); |
474 | kiocb.ki_pos = *ppos; |
475 | kiocb.ki_nbytes = len; |
476 | iov_iter_init(&iter, WRITE, &iov, 1, len); |
477 | |
478 | ret = filp->f_op->write_iter(&kiocb, &iter); |
479 | if (-EIOCBQUEUED == ret) |
480 | ret = wait_on_sync_kiocb(&kiocb); |
481 | *ppos = kiocb.ki_pos; |
482 | return ret; |
483 | } |
484 | |
485 | EXPORT_SYMBOL(new_sync_write); |
486 | |
487 | ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos) |
488 | { |
489 | mm_segment_t old_fs; |
490 | const char __user *p; |
491 | ssize_t ret; |
492 | |
493 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
494 | return -EINVAL; |
495 | |
496 | old_fs = get_fs(); |
497 | set_fs(get_ds()); |
498 | p = (__force const char __user *)buf; |
499 | if (count > MAX_RW_COUNT) |
500 | count = MAX_RW_COUNT; |
501 | if (file->f_op->write) |
502 | ret = file->f_op->write(file, p, count, pos); |
503 | else if (file->f_op->aio_write) |
504 | ret = do_sync_write(file, p, count, pos); |
505 | else |
506 | ret = new_sync_write(file, p, count, pos); |
507 | set_fs(old_fs); |
508 | if (ret > 0) { |
509 | fsnotify_modify(file); |
510 | add_wchar(current, ret); |
511 | } |
512 | inc_syscw(current); |
513 | return ret; |
514 | } |
515 | |
516 | ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos) |
517 | { |
518 | ssize_t ret; |
519 | |
520 | if (!(file->f_mode & FMODE_WRITE)) |
521 | return -EBADF; |
522 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
523 | return -EINVAL; |
524 | if (unlikely(!access_ok(VERIFY_READ, buf, count))) |
525 | return -EFAULT; |
526 | |
527 | ret = rw_verify_area(WRITE, file, pos, count); |
528 | if (ret >= 0) { |
529 | count = ret; |
530 | file_start_write(file); |
531 | if (file->f_op->write) |
532 | ret = file->f_op->write(file, buf, count, pos); |
533 | else if (file->f_op->aio_write) |
534 | ret = do_sync_write(file, buf, count, pos); |
535 | else |
536 | ret = new_sync_write(file, buf, count, pos); |
537 | if (ret > 0) { |
538 | fsnotify_modify(file); |
539 | add_wchar(current, ret); |
540 | } |
541 | inc_syscw(current); |
542 | file_end_write(file); |
543 | } |
544 | |
545 | return ret; |
546 | } |
547 | |
548 | EXPORT_SYMBOL(vfs_write); |
549 | |
550 | static inline loff_t file_pos_read(struct file *file) |
551 | { |
552 | return file->f_pos; |
553 | } |
554 | |
555 | static inline void file_pos_write(struct file *file, loff_t pos) |
556 | { |
557 | file->f_pos = pos; |
558 | } |
559 | |
560 | SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count) |
561 | { |
562 | struct fd f = fdget_pos(fd); |
563 | ssize_t ret = -EBADF; |
564 | |
565 | if (f.file) { |
566 | loff_t pos = file_pos_read(f.file); |
567 | ret = vfs_read(f.file, buf, count, &pos); |
568 | if (ret >= 0) |
569 | file_pos_write(f.file, pos); |
570 | fdput_pos(f); |
571 | } |
572 | return ret; |
573 | } |
574 | |
575 | SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf, |
576 | size_t, count) |
577 | { |
578 | struct fd f = fdget_pos(fd); |
579 | ssize_t ret = -EBADF; |
580 | |
581 | if (f.file) { |
582 | loff_t pos = file_pos_read(f.file); |
583 | ret = vfs_write(f.file, buf, count, &pos); |
584 | if (ret >= 0) |
585 | file_pos_write(f.file, pos); |
586 | fdput_pos(f); |
587 | } |
588 | |
589 | return ret; |
590 | } |
591 | |
592 | SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf, |
593 | size_t, count, loff_t, pos) |
594 | { |
595 | struct fd f; |
596 | ssize_t ret = -EBADF; |
597 | |
598 | if (pos < 0) |
599 | return -EINVAL; |
600 | |
601 | f = fdget(fd); |
602 | if (f.file) { |
603 | ret = -ESPIPE; |
604 | if (f.file->f_mode & FMODE_PREAD) |
605 | ret = vfs_read(f.file, buf, count, &pos); |
606 | fdput(f); |
607 | } |
608 | |
609 | return ret; |
610 | } |
611 | |
612 | SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf, |
613 | size_t, count, loff_t, pos) |
614 | { |
615 | struct fd f; |
616 | ssize_t ret = -EBADF; |
617 | |
618 | if (pos < 0) |
619 | return -EINVAL; |
620 | |
621 | f = fdget(fd); |
622 | if (f.file) { |
623 | ret = -ESPIPE; |
624 | if (f.file->f_mode & FMODE_PWRITE) |
625 | ret = vfs_write(f.file, buf, count, &pos); |
626 | fdput(f); |
627 | } |
628 | |
629 | return ret; |
630 | } |
631 | |
632 | /* |
633 | * Reduce an iovec's length in-place. Return the resulting number of segments |
634 | */ |
635 | unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to) |
636 | { |
637 | unsigned long seg = 0; |
638 | size_t len = 0; |
639 | |
640 | while (seg < nr_segs) { |
641 | seg++; |
642 | if (len + iov->iov_len >= to) { |
643 | iov->iov_len = to - len; |
644 | break; |
645 | } |
646 | len += iov->iov_len; |
647 | iov++; |
648 | } |
649 | return seg; |
650 | } |
651 | EXPORT_SYMBOL(iov_shorten); |
652 | |
653 | static ssize_t do_iter_readv_writev(struct file *filp, int rw, const struct iovec *iov, |
654 | unsigned long nr_segs, size_t len, loff_t *ppos, iter_fn_t fn) |
655 | { |
656 | struct kiocb kiocb; |
657 | struct iov_iter iter; |
658 | ssize_t ret; |
659 | |
660 | init_sync_kiocb(&kiocb, filp); |
661 | kiocb.ki_pos = *ppos; |
662 | kiocb.ki_nbytes = len; |
663 | |
664 | iov_iter_init(&iter, rw, iov, nr_segs, len); |
665 | ret = fn(&kiocb, &iter); |
666 | if (ret == -EIOCBQUEUED) |
667 | ret = wait_on_sync_kiocb(&kiocb); |
668 | *ppos = kiocb.ki_pos; |
669 | return ret; |
670 | } |
671 | |
672 | static ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov, |
673 | unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn) |
674 | { |
675 | struct kiocb kiocb; |
676 | ssize_t ret; |
677 | |
678 | init_sync_kiocb(&kiocb, filp); |
679 | kiocb.ki_pos = *ppos; |
680 | kiocb.ki_nbytes = len; |
681 | |
682 | ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos); |
683 | if (ret == -EIOCBQUEUED) |
684 | ret = wait_on_sync_kiocb(&kiocb); |
685 | *ppos = kiocb.ki_pos; |
686 | return ret; |
687 | } |
688 | |
689 | /* Do it by hand, with file-ops */ |
690 | static ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov, |
691 | unsigned long nr_segs, loff_t *ppos, io_fn_t fn) |
692 | { |
693 | struct iovec *vector = iov; |
694 | ssize_t ret = 0; |
695 | |
696 | while (nr_segs > 0) { |
697 | void __user *base; |
698 | size_t len; |
699 | ssize_t nr; |
700 | |
701 | base = vector->iov_base; |
702 | len = vector->iov_len; |
703 | vector++; |
704 | nr_segs--; |
705 | |
706 | nr = fn(filp, base, len, ppos); |
707 | |
708 | if (nr < 0) { |
709 | if (!ret) |
710 | ret = nr; |
711 | break; |
712 | } |
713 | ret += nr; |
714 | if (nr != len) |
715 | break; |
716 | } |
717 | |
718 | return ret; |
719 | } |
720 | |
721 | /* A write operation does a read from user space and vice versa */ |
722 | #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ) |
723 | |
724 | ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
725 | unsigned long nr_segs, unsigned long fast_segs, |
726 | struct iovec *fast_pointer, |
727 | struct iovec **ret_pointer) |
728 | { |
729 | unsigned long seg; |
730 | ssize_t ret; |
731 | struct iovec *iov = fast_pointer; |
732 | |
733 | /* |
734 | * SuS says "The readv() function *may* fail if the iovcnt argument |
735 | * was less than or equal to 0, or greater than {IOV_MAX}. Linux has |
736 | * traditionally returned zero for zero segments, so... |
737 | */ |
738 | if (nr_segs == 0) { |
739 | ret = 0; |
740 | goto out; |
741 | } |
742 | |
743 | /* |
744 | * First get the "struct iovec" from user memory and |
745 | * verify all the pointers |
746 | */ |
747 | if (nr_segs > UIO_MAXIOV) { |
748 | ret = -EINVAL; |
749 | goto out; |
750 | } |
751 | if (nr_segs > fast_segs) { |
752 | iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL); |
753 | if (iov == NULL) { |
754 | ret = -ENOMEM; |
755 | goto out; |
756 | } |
757 | } |
758 | if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) { |
759 | ret = -EFAULT; |
760 | goto out; |
761 | } |
762 | |
763 | /* |
764 | * According to the Single Unix Specification we should return EINVAL |
765 | * if an element length is < 0 when cast to ssize_t or if the |
766 | * total length would overflow the ssize_t return value of the |
767 | * system call. |
768 | * |
769 | * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the |
770 | * overflow case. |
771 | */ |
772 | ret = 0; |
773 | for (seg = 0; seg < nr_segs; seg++) { |
774 | void __user *buf = iov[seg].iov_base; |
775 | ssize_t len = (ssize_t)iov[seg].iov_len; |
776 | |
777 | /* see if we we're about to use an invalid len or if |
778 | * it's about to overflow ssize_t */ |
779 | if (len < 0) { |
780 | ret = -EINVAL; |
781 | goto out; |
782 | } |
783 | if (type >= 0 |
784 | && unlikely(!access_ok(vrfy_dir(type), buf, len))) { |
785 | ret = -EFAULT; |
786 | goto out; |
787 | } |
788 | if (len > MAX_RW_COUNT - ret) { |
789 | len = MAX_RW_COUNT - ret; |
790 | iov[seg].iov_len = len; |
791 | } |
792 | ret += len; |
793 | } |
794 | out: |
795 | *ret_pointer = iov; |
796 | return ret; |
797 | } |
798 | |
799 | static ssize_t do_readv_writev(int type, struct file *file, |
800 | const struct iovec __user * uvector, |
801 | unsigned long nr_segs, loff_t *pos) |
802 | { |
803 | size_t tot_len; |
804 | struct iovec iovstack[UIO_FASTIOV]; |
805 | struct iovec *iov = iovstack; |
806 | ssize_t ret; |
807 | io_fn_t fn; |
808 | iov_fn_t fnv; |
809 | iter_fn_t iter_fn; |
810 | |
811 | ret = rw_copy_check_uvector(type, uvector, nr_segs, |
812 | ARRAY_SIZE(iovstack), iovstack, &iov); |
813 | if (ret <= 0) |
814 | goto out; |
815 | |
816 | tot_len = ret; |
817 | ret = rw_verify_area(type, file, pos, tot_len); |
818 | if (ret < 0) |
819 | goto out; |
820 | |
821 | fnv = NULL; |
822 | if (type == READ) { |
823 | fn = file->f_op->read; |
824 | fnv = file->f_op->aio_read; |
825 | iter_fn = file->f_op->read_iter; |
826 | } else { |
827 | fn = (io_fn_t)file->f_op->write; |
828 | fnv = file->f_op->aio_write; |
829 | iter_fn = file->f_op->write_iter; |
830 | file_start_write(file); |
831 | } |
832 | |
833 | if (iter_fn) |
834 | ret = do_iter_readv_writev(file, type, iov, nr_segs, tot_len, |
835 | pos, iter_fn); |
836 | else if (fnv) |
837 | ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
838 | pos, fnv); |
839 | else |
840 | ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
841 | |
842 | if (type != READ) |
843 | file_end_write(file); |
844 | |
845 | out: |
846 | if (iov != iovstack) |
847 | kfree(iov); |
848 | if ((ret + (type == READ)) > 0) { |
849 | if (type == READ) |
850 | fsnotify_access(file); |
851 | else |
852 | fsnotify_modify(file); |
853 | } |
854 | return ret; |
855 | } |
856 | |
857 | ssize_t vfs_readv(struct file *file, const struct iovec __user *vec, |
858 | unsigned long vlen, loff_t *pos) |
859 | { |
860 | if (!(file->f_mode & FMODE_READ)) |
861 | return -EBADF; |
862 | if (!(file->f_mode & FMODE_CAN_READ)) |
863 | return -EINVAL; |
864 | |
865 | return do_readv_writev(READ, file, vec, vlen, pos); |
866 | } |
867 | |
868 | EXPORT_SYMBOL(vfs_readv); |
869 | |
870 | ssize_t vfs_writev(struct file *file, const struct iovec __user *vec, |
871 | unsigned long vlen, loff_t *pos) |
872 | { |
873 | if (!(file->f_mode & FMODE_WRITE)) |
874 | return -EBADF; |
875 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
876 | return -EINVAL; |
877 | |
878 | return do_readv_writev(WRITE, file, vec, vlen, pos); |
879 | } |
880 | |
881 | EXPORT_SYMBOL(vfs_writev); |
882 | |
883 | SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec, |
884 | unsigned long, vlen) |
885 | { |
886 | struct fd f = fdget_pos(fd); |
887 | ssize_t ret = -EBADF; |
888 | |
889 | if (f.file) { |
890 | loff_t pos = file_pos_read(f.file); |
891 | ret = vfs_readv(f.file, vec, vlen, &pos); |
892 | if (ret >= 0) |
893 | file_pos_write(f.file, pos); |
894 | fdput_pos(f); |
895 | } |
896 | |
897 | if (ret > 0) |
898 | add_rchar(current, ret); |
899 | inc_syscr(current); |
900 | return ret; |
901 | } |
902 | |
903 | SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec, |
904 | unsigned long, vlen) |
905 | { |
906 | struct fd f = fdget_pos(fd); |
907 | ssize_t ret = -EBADF; |
908 | |
909 | if (f.file) { |
910 | loff_t pos = file_pos_read(f.file); |
911 | ret = vfs_writev(f.file, vec, vlen, &pos); |
912 | if (ret >= 0) |
913 | file_pos_write(f.file, pos); |
914 | fdput_pos(f); |
915 | } |
916 | |
917 | if (ret > 0) |
918 | add_wchar(current, ret); |
919 | inc_syscw(current); |
920 | return ret; |
921 | } |
922 | |
923 | static inline loff_t pos_from_hilo(unsigned long high, unsigned long low) |
924 | { |
925 | #define HALF_LONG_BITS (BITS_PER_LONG / 2) |
926 | return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low; |
927 | } |
928 | |
929 | SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec, |
930 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
931 | { |
932 | loff_t pos = pos_from_hilo(pos_h, pos_l); |
933 | struct fd f; |
934 | ssize_t ret = -EBADF; |
935 | |
936 | if (pos < 0) |
937 | return -EINVAL; |
938 | |
939 | f = fdget(fd); |
940 | if (f.file) { |
941 | ret = -ESPIPE; |
942 | if (f.file->f_mode & FMODE_PREAD) |
943 | ret = vfs_readv(f.file, vec, vlen, &pos); |
944 | fdput(f); |
945 | } |
946 | |
947 | if (ret > 0) |
948 | add_rchar(current, ret); |
949 | inc_syscr(current); |
950 | return ret; |
951 | } |
952 | |
953 | SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec, |
954 | unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h) |
955 | { |
956 | loff_t pos = pos_from_hilo(pos_h, pos_l); |
957 | struct fd f; |
958 | ssize_t ret = -EBADF; |
959 | |
960 | if (pos < 0) |
961 | return -EINVAL; |
962 | |
963 | f = fdget(fd); |
964 | if (f.file) { |
965 | ret = -ESPIPE; |
966 | if (f.file->f_mode & FMODE_PWRITE) |
967 | ret = vfs_writev(f.file, vec, vlen, &pos); |
968 | fdput(f); |
969 | } |
970 | |
971 | if (ret > 0) |
972 | add_wchar(current, ret); |
973 | inc_syscw(current); |
974 | return ret; |
975 | } |
976 | |
977 | #ifdef CONFIG_COMPAT |
978 | |
979 | static ssize_t compat_do_readv_writev(int type, struct file *file, |
980 | const struct compat_iovec __user *uvector, |
981 | unsigned long nr_segs, loff_t *pos) |
982 | { |
983 | compat_ssize_t tot_len; |
984 | struct iovec iovstack[UIO_FASTIOV]; |
985 | struct iovec *iov = iovstack; |
986 | ssize_t ret; |
987 | io_fn_t fn; |
988 | iov_fn_t fnv; |
989 | iter_fn_t iter_fn; |
990 | |
991 | ret = compat_rw_copy_check_uvector(type, uvector, nr_segs, |
992 | UIO_FASTIOV, iovstack, &iov); |
993 | if (ret <= 0) |
994 | goto out; |
995 | |
996 | tot_len = ret; |
997 | ret = rw_verify_area(type, file, pos, tot_len); |
998 | if (ret < 0) |
999 | goto out; |
1000 | |
1001 | fnv = NULL; |
1002 | if (type == READ) { |
1003 | fn = file->f_op->read; |
1004 | fnv = file->f_op->aio_read; |
1005 | iter_fn = file->f_op->read_iter; |
1006 | } else { |
1007 | fn = (io_fn_t)file->f_op->write; |
1008 | fnv = file->f_op->aio_write; |
1009 | iter_fn = file->f_op->write_iter; |
1010 | file_start_write(file); |
1011 | } |
1012 | |
1013 | if (iter_fn) |
1014 | ret = do_iter_readv_writev(file, type, iov, nr_segs, tot_len, |
1015 | pos, iter_fn); |
1016 | else if (fnv) |
1017 | ret = do_sync_readv_writev(file, iov, nr_segs, tot_len, |
1018 | pos, fnv); |
1019 | else |
1020 | ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn); |
1021 | |
1022 | if (type != READ) |
1023 | file_end_write(file); |
1024 | |
1025 | out: |
1026 | if (iov != iovstack) |
1027 | kfree(iov); |
1028 | if ((ret + (type == READ)) > 0) { |
1029 | if (type == READ) |
1030 | fsnotify_access(file); |
1031 | else |
1032 | fsnotify_modify(file); |
1033 | } |
1034 | return ret; |
1035 | } |
1036 | |
1037 | static size_t compat_readv(struct file *file, |
1038 | const struct compat_iovec __user *vec, |
1039 | unsigned long vlen, loff_t *pos) |
1040 | { |
1041 | ssize_t ret = -EBADF; |
1042 | |
1043 | if (!(file->f_mode & FMODE_READ)) |
1044 | goto out; |
1045 | |
1046 | ret = -EINVAL; |
1047 | if (!(file->f_mode & FMODE_CAN_READ)) |
1048 | goto out; |
1049 | |
1050 | ret = compat_do_readv_writev(READ, file, vec, vlen, pos); |
1051 | |
1052 | out: |
1053 | if (ret > 0) |
1054 | add_rchar(current, ret); |
1055 | inc_syscr(current); |
1056 | return ret; |
1057 | } |
1058 | |
1059 | COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd, |
1060 | const struct compat_iovec __user *,vec, |
1061 | compat_ulong_t, vlen) |
1062 | { |
1063 | struct fd f = fdget_pos(fd); |
1064 | ssize_t ret; |
1065 | loff_t pos; |
1066 | |
1067 | if (!f.file) |
1068 | return -EBADF; |
1069 | pos = f.file->f_pos; |
1070 | ret = compat_readv(f.file, vec, vlen, &pos); |
1071 | if (ret >= 0) |
1072 | f.file->f_pos = pos; |
1073 | fdput_pos(f); |
1074 | return ret; |
1075 | } |
1076 | |
1077 | static long __compat_sys_preadv64(unsigned long fd, |
1078 | const struct compat_iovec __user *vec, |
1079 | unsigned long vlen, loff_t pos) |
1080 | { |
1081 | struct fd f; |
1082 | ssize_t ret; |
1083 | |
1084 | if (pos < 0) |
1085 | return -EINVAL; |
1086 | f = fdget(fd); |
1087 | if (!f.file) |
1088 | return -EBADF; |
1089 | ret = -ESPIPE; |
1090 | if (f.file->f_mode & FMODE_PREAD) |
1091 | ret = compat_readv(f.file, vec, vlen, &pos); |
1092 | fdput(f); |
1093 | return ret; |
1094 | } |
1095 | |
1096 | #ifdef __ARCH_WANT_COMPAT_SYS_PREADV64 |
1097 | COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd, |
1098 | const struct compat_iovec __user *,vec, |
1099 | unsigned long, vlen, loff_t, pos) |
1100 | { |
1101 | return __compat_sys_preadv64(fd, vec, vlen, pos); |
1102 | } |
1103 | #endif |
1104 | |
1105 | COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd, |
1106 | const struct compat_iovec __user *,vec, |
1107 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
1108 | { |
1109 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
1110 | |
1111 | return __compat_sys_preadv64(fd, vec, vlen, pos); |
1112 | } |
1113 | |
1114 | static size_t compat_writev(struct file *file, |
1115 | const struct compat_iovec __user *vec, |
1116 | unsigned long vlen, loff_t *pos) |
1117 | { |
1118 | ssize_t ret = -EBADF; |
1119 | |
1120 | if (!(file->f_mode & FMODE_WRITE)) |
1121 | goto out; |
1122 | |
1123 | ret = -EINVAL; |
1124 | if (!(file->f_mode & FMODE_CAN_WRITE)) |
1125 | goto out; |
1126 | |
1127 | ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos); |
1128 | |
1129 | out: |
1130 | if (ret > 0) |
1131 | add_wchar(current, ret); |
1132 | inc_syscw(current); |
1133 | return ret; |
1134 | } |
1135 | |
1136 | COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd, |
1137 | const struct compat_iovec __user *, vec, |
1138 | compat_ulong_t, vlen) |
1139 | { |
1140 | struct fd f = fdget_pos(fd); |
1141 | ssize_t ret; |
1142 | loff_t pos; |
1143 | |
1144 | if (!f.file) |
1145 | return -EBADF; |
1146 | pos = f.file->f_pos; |
1147 | ret = compat_writev(f.file, vec, vlen, &pos); |
1148 | if (ret >= 0) |
1149 | f.file->f_pos = pos; |
1150 | fdput_pos(f); |
1151 | return ret; |
1152 | } |
1153 | |
1154 | static long __compat_sys_pwritev64(unsigned long fd, |
1155 | const struct compat_iovec __user *vec, |
1156 | unsigned long vlen, loff_t pos) |
1157 | { |
1158 | struct fd f; |
1159 | ssize_t ret; |
1160 | |
1161 | if (pos < 0) |
1162 | return -EINVAL; |
1163 | f = fdget(fd); |
1164 | if (!f.file) |
1165 | return -EBADF; |
1166 | ret = -ESPIPE; |
1167 | if (f.file->f_mode & FMODE_PWRITE) |
1168 | ret = compat_writev(f.file, vec, vlen, &pos); |
1169 | fdput(f); |
1170 | return ret; |
1171 | } |
1172 | |
1173 | #ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64 |
1174 | COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd, |
1175 | const struct compat_iovec __user *,vec, |
1176 | unsigned long, vlen, loff_t, pos) |
1177 | { |
1178 | return __compat_sys_pwritev64(fd, vec, vlen, pos); |
1179 | } |
1180 | #endif |
1181 | |
1182 | COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd, |
1183 | const struct compat_iovec __user *,vec, |
1184 | compat_ulong_t, vlen, u32, pos_low, u32, pos_high) |
1185 | { |
1186 | loff_t pos = ((loff_t)pos_high << 32) | pos_low; |
1187 | |
1188 | return __compat_sys_pwritev64(fd, vec, vlen, pos); |
1189 | } |
1190 | #endif |
1191 | |
1192 | static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos, |
1193 | size_t count, loff_t max) |
1194 | { |
1195 | struct fd in, out; |
1196 | struct inode *in_inode, *out_inode; |
1197 | loff_t pos; |
1198 | loff_t out_pos; |
1199 | ssize_t retval; |
1200 | int fl; |
1201 | |
1202 | /* |
1203 | * Get input file, and verify that it is ok.. |
1204 | */ |
1205 | retval = -EBADF; |
1206 | in = fdget(in_fd); |
1207 | if (!in.file) |
1208 | goto out; |
1209 | if (!(in.file->f_mode & FMODE_READ)) |
1210 | goto fput_in; |
1211 | retval = -ESPIPE; |
1212 | if (!ppos) { |
1213 | pos = in.file->f_pos; |
1214 | } else { |
1215 | pos = *ppos; |
1216 | if (!(in.file->f_mode & FMODE_PREAD)) |
1217 | goto fput_in; |
1218 | } |
1219 | retval = rw_verify_area(READ, in.file, &pos, count); |
1220 | if (retval < 0) |
1221 | goto fput_in; |
1222 | count = retval; |
1223 | |
1224 | /* |
1225 | * Get output file, and verify that it is ok.. |
1226 | */ |
1227 | retval = -EBADF; |
1228 | out = fdget(out_fd); |
1229 | if (!out.file) |
1230 | goto fput_in; |
1231 | if (!(out.file->f_mode & FMODE_WRITE)) |
1232 | goto fput_out; |
1233 | retval = -EINVAL; |
1234 | in_inode = file_inode(in.file); |
1235 | out_inode = file_inode(out.file); |
1236 | out_pos = out.file->f_pos; |
1237 | retval = rw_verify_area(WRITE, out.file, &out_pos, count); |
1238 | if (retval < 0) |
1239 | goto fput_out; |
1240 | count = retval; |
1241 | |
1242 | if (!max) |
1243 | max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes); |
1244 | |
1245 | if (unlikely(pos + count > max)) { |
1246 | retval = -EOVERFLOW; |
1247 | if (pos >= max) |
1248 | goto fput_out; |
1249 | count = max - pos; |
1250 | } |
1251 | |
1252 | fl = 0; |
1253 | #if 0 |
1254 | /* |
1255 | * We need to debate whether we can enable this or not. The |
1256 | * man page documents EAGAIN return for the output at least, |
1257 | * and the application is arguably buggy if it doesn't expect |
1258 | * EAGAIN on a non-blocking file descriptor. |
1259 | */ |
1260 | if (in.file->f_flags & O_NONBLOCK) |
1261 | fl = SPLICE_F_NONBLOCK; |
1262 | #endif |
1263 | file_start_write(out.file); |
1264 | retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl); |
1265 | file_end_write(out.file); |
1266 | |
1267 | if (retval > 0) { |
1268 | add_rchar(current, retval); |
1269 | add_wchar(current, retval); |
1270 | fsnotify_access(in.file); |
1271 | fsnotify_modify(out.file); |
1272 | out.file->f_pos = out_pos; |
1273 | if (ppos) |
1274 | *ppos = pos; |
1275 | else |
1276 | in.file->f_pos = pos; |
1277 | } |
1278 | |
1279 | inc_syscr(current); |
1280 | inc_syscw(current); |
1281 | if (pos > max) |
1282 | retval = -EOVERFLOW; |
1283 | |
1284 | fput_out: |
1285 | fdput(out); |
1286 | fput_in: |
1287 | fdput(in); |
1288 | out: |
1289 | return retval; |
1290 | } |
1291 | |
1292 | SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_t, count) |
1293 | { |
1294 | loff_t pos; |
1295 | off_t off; |
1296 | ssize_t ret; |
1297 | |
1298 | if (offset) { |
1299 | if (unlikely(get_user(off, offset))) |
1300 | return -EFAULT; |
1301 | pos = off; |
1302 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); |
1303 | if (unlikely(put_user(pos, offset))) |
1304 | return -EFAULT; |
1305 | return ret; |
1306 | } |
1307 | |
1308 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
1309 | } |
1310 | |
1311 | SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count) |
1312 | { |
1313 | loff_t pos; |
1314 | ssize_t ret; |
1315 | |
1316 | if (offset) { |
1317 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) |
1318 | return -EFAULT; |
1319 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); |
1320 | if (unlikely(put_user(pos, offset))) |
1321 | return -EFAULT; |
1322 | return ret; |
1323 | } |
1324 | |
1325 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
1326 | } |
1327 | |
1328 | #ifdef CONFIG_COMPAT |
1329 | COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, |
1330 | compat_off_t __user *, offset, compat_size_t, count) |
1331 | { |
1332 | loff_t pos; |
1333 | off_t off; |
1334 | ssize_t ret; |
1335 | |
1336 | if (offset) { |
1337 | if (unlikely(get_user(off, offset))) |
1338 | return -EFAULT; |
1339 | pos = off; |
1340 | ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS); |
1341 | if (unlikely(put_user(pos, offset))) |
1342 | return -EFAULT; |
1343 | return ret; |
1344 | } |
1345 | |
1346 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
1347 | } |
1348 | |
1349 | COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, |
1350 | compat_loff_t __user *, offset, compat_size_t, count) |
1351 | { |
1352 | loff_t pos; |
1353 | ssize_t ret; |
1354 | |
1355 | if (offset) { |
1356 | if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t)))) |
1357 | return -EFAULT; |
1358 | ret = do_sendfile(out_fd, in_fd, &pos, count, 0); |
1359 | if (unlikely(put_user(pos, offset))) |
1360 | return -EFAULT; |
1361 | return ret; |
1362 | } |
1363 | |
1364 | return do_sendfile(out_fd, in_fd, NULL, count, 0); |
1365 | } |
1366 | #endif |
1367 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9