blob: 9012312692427e96b34ea9da26631c16e273f627 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Robert Love0eeca282005-07-12 17:06:03 -040012#include <linux/fsnotify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/security.h>
Paul Gortmaker630d9c42011-11-16 23:57:37 -050014#include <linux/export.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/syscalls.h>
Linus Torvaldse28cc712006-01-04 16:20:40 -080016#include <linux/pagemap.h>
Jens Axboed6b29d72007-06-04 09:59:47 +020017#include <linux/splice.h>
Al Viro561c6732013-02-24 10:52:26 -050018#include <linux/compat.h>
Zach Brown29732932015-11-10 16:53:30 -050019#include <linux/mount.h>
Wouter van Kesteren2feb55f2016-02-16 22:20:59 +010020#include <linux/fs.h>
Al Viro06ae43f2013-03-20 13:19:30 -040021#include "internal.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#include <asm/uaccess.h>
24#include <asm/unistd.h>
25
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080026const struct file_operations generic_ro_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070027 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -040028 .read_iter = generic_file_read_iter,
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 .mmap = generic_file_readonly_mmap,
Jens Axboe534f2aa2007-06-01 14:52:37 +020030 .splice_read = generic_file_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -070031};
32
33EXPORT_SYMBOL(generic_ro_fops);
34
Al Virocccb5a12010-12-17 07:44:05 -050035static inline int unsigned_offsets(struct file *file)
KAMEZAWA Hiroyuki4a3956c2010-10-01 14:20:22 -070036{
Al Virocccb5a12010-12-17 07:44:05 -050037 return file->f_mode & FMODE_UNSIGNED_OFFSET;
KAMEZAWA Hiroyuki4a3956c2010-10-01 14:20:22 -070038}
39
Jie Liu46a1c2c2013-06-25 12:02:13 +080040/**
41 * vfs_setpos - update the file offset for lseek
42 * @file: file structure in question
43 * @offset: file offset to seek to
44 * @maxsize: maximum file size
45 *
46 * This is a low-level filesystem helper for updating the file offset to
47 * the value specified by @offset if the given offset is valid and it is
48 * not equal to the current file offset.
49 *
50 * Return the specified offset on success and -EINVAL on invalid offset.
51 */
52loff_t vfs_setpos(struct file *file, loff_t offset, loff_t maxsize)
Andi Kleenef3d0fd2011-09-15 16:06:48 -070053{
54 if (offset < 0 && !unsigned_offsets(file))
55 return -EINVAL;
56 if (offset > maxsize)
57 return -EINVAL;
58
59 if (offset != file->f_pos) {
60 file->f_pos = offset;
61 file->f_version = 0;
62 }
63 return offset;
64}
Jie Liu46a1c2c2013-06-25 12:02:13 +080065EXPORT_SYMBOL(vfs_setpos);
Andi Kleenef3d0fd2011-09-15 16:06:48 -070066
Christoph Hellwig3a8cff42008-08-11 15:37:17 +020067/**
Andi Kleen57604952011-09-15 16:06:50 -070068 * generic_file_llseek_size - generic llseek implementation for regular files
Christoph Hellwig3a8cff42008-08-11 15:37:17 +020069 * @file: file structure to seek on
70 * @offset: file offset to seek to
Andrew Morton965c8e52012-12-17 15:59:39 -080071 * @whence: type of seek
Eric Sandeene8b96eb2012-04-30 13:11:29 -050072 * @size: max size of this file in file system
73 * @eof: offset used for SEEK_END position
Christoph Hellwig3a8cff42008-08-11 15:37:17 +020074 *
Andi Kleen57604952011-09-15 16:06:50 -070075 * This is a variant of generic_file_llseek that allows passing in a custom
Eric Sandeene8b96eb2012-04-30 13:11:29 -050076 * maximum file size and a custom EOF position, for e.g. hashed directories
Andi Kleenef3d0fd2011-09-15 16:06:48 -070077 *
78 * Synchronization:
Andi Kleen57604952011-09-15 16:06:50 -070079 * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms)
Andi Kleenef3d0fd2011-09-15 16:06:48 -070080 * SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes.
81 * read/writes behave like SEEK_SET against seeks.
Christoph Hellwig3a8cff42008-08-11 15:37:17 +020082 */
Andi Kleen9465efc2008-06-27 11:05:24 +020083loff_t
Andrew Morton965c8e52012-12-17 15:59:39 -080084generic_file_llseek_size(struct file *file, loff_t offset, int whence,
Eric Sandeene8b96eb2012-04-30 13:11:29 -050085 loff_t maxsize, loff_t eof)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Andrew Morton965c8e52012-12-17 15:59:39 -080087 switch (whence) {
Christoph Hellwig3a8cff42008-08-11 15:37:17 +020088 case SEEK_END:
Eric Sandeene8b96eb2012-04-30 13:11:29 -050089 offset += eof;
Christoph Hellwig3a8cff42008-08-11 15:37:17 +020090 break;
91 case SEEK_CUR:
Alain Knaff5b6f1eb2008-11-10 17:08:08 -080092 /*
93 * Here we special-case the lseek(fd, 0, SEEK_CUR)
94 * position-querying operation. Avoid rewriting the "same"
95 * f_pos value back to the file because a concurrent read(),
96 * write() or lseek() might have altered it
97 */
98 if (offset == 0)
99 return file->f_pos;
Andi Kleenef3d0fd2011-09-15 16:06:48 -0700100 /*
101 * f_lock protects against read/modify/write race with other
102 * SEEK_CURs. Note that parallel writes and reads behave
103 * like SEEK_SET.
104 */
105 spin_lock(&file->f_lock);
Jie Liu46a1c2c2013-06-25 12:02:13 +0800106 offset = vfs_setpos(file, file->f_pos + offset, maxsize);
Andi Kleenef3d0fd2011-09-15 16:06:48 -0700107 spin_unlock(&file->f_lock);
108 return offset;
Josef Bacik982d8162011-07-18 13:21:35 -0400109 case SEEK_DATA:
110 /*
111 * In the generic case the entire file is data, so as long as
112 * offset isn't at the end of the file then the offset is data.
113 */
Andreas Gruenbacherf3e2e7f2017-09-25 12:23:03 +0200114 if ((unsigned long long)offset >= eof)
Josef Bacik982d8162011-07-18 13:21:35 -0400115 return -ENXIO;
116 break;
117 case SEEK_HOLE:
118 /*
119 * There is a virtual hole at the end of the file, so as long as
120 * offset isn't i_size or larger, return i_size.
121 */
Andreas Gruenbacherf3e2e7f2017-09-25 12:23:03 +0200122 if ((unsigned long long)offset >= eof)
Josef Bacik982d8162011-07-18 13:21:35 -0400123 return -ENXIO;
Eric Sandeene8b96eb2012-04-30 13:11:29 -0500124 offset = eof;
Josef Bacik982d8162011-07-18 13:21:35 -0400125 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 }
Christoph Hellwig3a8cff42008-08-11 15:37:17 +0200127
Jie Liu46a1c2c2013-06-25 12:02:13 +0800128 return vfs_setpos(file, offset, maxsize);
Andi Kleen57604952011-09-15 16:06:50 -0700129}
130EXPORT_SYMBOL(generic_file_llseek_size);
131
132/**
133 * generic_file_llseek - generic llseek implementation for regular files
134 * @file: file structure to seek on
135 * @offset: file offset to seek to
Andrew Morton965c8e52012-12-17 15:59:39 -0800136 * @whence: type of seek
Andi Kleen57604952011-09-15 16:06:50 -0700137 *
138 * This is a generic implemenation of ->llseek useable for all normal local
139 * filesystems. It just updates the file offset to the value specified by
Ming Lei546ae2d2013-04-29 15:06:07 -0700140 * @offset and @whence.
Andi Kleen57604952011-09-15 16:06:50 -0700141 */
Andrew Morton965c8e52012-12-17 15:59:39 -0800142loff_t generic_file_llseek(struct file *file, loff_t offset, int whence)
Andi Kleen57604952011-09-15 16:06:50 -0700143{
144 struct inode *inode = file->f_mapping->host;
145
Andrew Morton965c8e52012-12-17 15:59:39 -0800146 return generic_file_llseek_size(file, offset, whence,
Eric Sandeene8b96eb2012-04-30 13:11:29 -0500147 inode->i_sb->s_maxbytes,
148 i_size_read(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149}
Andi Kleen9465efc2008-06-27 11:05:24 +0200150EXPORT_SYMBOL(generic_file_llseek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
jan Blunckae6afc32010-05-26 14:44:48 -0700152/**
Al Viro1bf9d142013-06-16 20:27:42 +0400153 * fixed_size_llseek - llseek implementation for fixed-sized devices
154 * @file: file structure to seek on
155 * @offset: file offset to seek to
156 * @whence: type of seek
157 * @size: size of the file
158 *
159 */
160loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size)
161{
162 switch (whence) {
163 case SEEK_SET: case SEEK_CUR: case SEEK_END:
164 return generic_file_llseek_size(file, offset, whence,
165 size, size);
166 default:
167 return -EINVAL;
168 }
169}
170EXPORT_SYMBOL(fixed_size_llseek);
171
172/**
Al Virob25472f2015-12-05 22:04:48 -0500173 * no_seek_end_llseek - llseek implementation for fixed-sized devices
174 * @file: file structure to seek on
175 * @offset: file offset to seek to
176 * @whence: type of seek
177 *
178 */
179loff_t no_seek_end_llseek(struct file *file, loff_t offset, int whence)
180{
181 switch (whence) {
182 case SEEK_SET: case SEEK_CUR:
183 return generic_file_llseek_size(file, offset, whence,
Wouter van Kesteren2feb55f2016-02-16 22:20:59 +0100184 OFFSET_MAX, 0);
Al Virob25472f2015-12-05 22:04:48 -0500185 default:
186 return -EINVAL;
187 }
188}
189EXPORT_SYMBOL(no_seek_end_llseek);
190
191/**
192 * no_seek_end_llseek_size - llseek implementation for fixed-sized devices
193 * @file: file structure to seek on
194 * @offset: file offset to seek to
195 * @whence: type of seek
196 * @size: maximal offset allowed
197 *
198 */
199loff_t no_seek_end_llseek_size(struct file *file, loff_t offset, int whence, loff_t size)
200{
201 switch (whence) {
202 case SEEK_SET: case SEEK_CUR:
203 return generic_file_llseek_size(file, offset, whence,
204 size, 0);
205 default:
206 return -EINVAL;
207 }
208}
209EXPORT_SYMBOL(no_seek_end_llseek_size);
210
211/**
jan Blunckae6afc32010-05-26 14:44:48 -0700212 * noop_llseek - No Operation Performed llseek implementation
213 * @file: file structure to seek on
214 * @offset: file offset to seek to
Andrew Morton965c8e52012-12-17 15:59:39 -0800215 * @whence: type of seek
jan Blunckae6afc32010-05-26 14:44:48 -0700216 *
217 * This is an implementation of ->llseek useable for the rare special case when
218 * userspace expects the seek to succeed but the (device) file is actually not
219 * able to perform the seek. In this case you use noop_llseek() instead of
220 * falling back to the default implementation of ->llseek.
221 */
Andrew Morton965c8e52012-12-17 15:59:39 -0800222loff_t noop_llseek(struct file *file, loff_t offset, int whence)
jan Blunckae6afc32010-05-26 14:44:48 -0700223{
224 return file->f_pos;
225}
226EXPORT_SYMBOL(noop_llseek);
227
Andrew Morton965c8e52012-12-17 15:59:39 -0800228loff_t no_llseek(struct file *file, loff_t offset, int whence)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229{
230 return -ESPIPE;
231}
232EXPORT_SYMBOL(no_llseek);
233
Andrew Morton965c8e52012-12-17 15:59:39 -0800234loff_t default_llseek(struct file *file, loff_t offset, int whence)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235{
Al Viro496ad9a2013-01-23 17:07:38 -0500236 struct inode *inode = file_inode(file);
David Sterba16abef02008-04-22 15:09:22 +0200237 loff_t retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
Al Viro59551022016-01-22 15:40:57 -0500239 inode_lock(inode);
Andrew Morton965c8e52012-12-17 15:59:39 -0800240 switch (whence) {
Chris Snook7b8e8922007-05-08 00:24:13 -0700241 case SEEK_END:
Josef Bacik982d8162011-07-18 13:21:35 -0400242 offset += i_size_read(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 break;
Chris Snook7b8e8922007-05-08 00:24:13 -0700244 case SEEK_CUR:
Alain Knaff5b6f1eb2008-11-10 17:08:08 -0800245 if (offset == 0) {
246 retval = file->f_pos;
247 goto out;
248 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 offset += file->f_pos;
Josef Bacik982d8162011-07-18 13:21:35 -0400250 break;
251 case SEEK_DATA:
252 /*
253 * In the generic case the entire file is data, so as
254 * long as offset isn't at the end of the file then the
255 * offset is data.
256 */
Dan Carpenterbacb2d82011-07-26 17:25:20 +0300257 if (offset >= inode->i_size) {
258 retval = -ENXIO;
259 goto out;
260 }
Josef Bacik982d8162011-07-18 13:21:35 -0400261 break;
262 case SEEK_HOLE:
263 /*
264 * There is a virtual hole at the end of the file, so
265 * as long as offset isn't i_size or larger, return
266 * i_size.
267 */
Dan Carpenterbacb2d82011-07-26 17:25:20 +0300268 if (offset >= inode->i_size) {
269 retval = -ENXIO;
270 goto out;
271 }
Josef Bacik982d8162011-07-18 13:21:35 -0400272 offset = inode->i_size;
273 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 }
275 retval = -EINVAL;
Al Virocccb5a12010-12-17 07:44:05 -0500276 if (offset >= 0 || unsigned_offsets(file)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 if (offset != file->f_pos) {
278 file->f_pos = offset;
279 file->f_version = 0;
280 }
281 retval = offset;
282 }
Alain Knaff5b6f1eb2008-11-10 17:08:08 -0800283out:
Al Viro59551022016-01-22 15:40:57 -0500284 inode_unlock(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 return retval;
286}
287EXPORT_SYMBOL(default_llseek);
288
Andrew Morton965c8e52012-12-17 15:59:39 -0800289loff_t vfs_llseek(struct file *file, loff_t offset, int whence)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290{
291 loff_t (*fn)(struct file *, loff_t, int);
292
293 fn = no_llseek;
294 if (file->f_mode & FMODE_LSEEK) {
Al Viro72c2d532013-09-22 16:27:52 -0400295 if (file->f_op->llseek)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 fn = file->f_op->llseek;
297 }
Andrew Morton965c8e52012-12-17 15:59:39 -0800298 return fn(file, offset, whence);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299}
300EXPORT_SYMBOL(vfs_llseek);
301
Andrew Morton965c8e52012-12-17 15:59:39 -0800302SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
304 off_t retval;
Linus Torvalds9c225f22014-03-03 09:36:58 -0800305 struct fd f = fdget_pos(fd);
Al Viro2903ff02012-08-28 12:52:22 -0400306 if (!f.file)
307 return -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 retval = -EINVAL;
Andrew Morton965c8e52012-12-17 15:59:39 -0800310 if (whence <= SEEK_MAX) {
311 loff_t res = vfs_llseek(f.file, offset, whence);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 retval = res;
313 if (res != (loff_t)retval)
314 retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */
315 }
Linus Torvalds9c225f22014-03-03 09:36:58 -0800316 fdput_pos(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 return retval;
318}
319
Al Viro561c6732013-02-24 10:52:26 -0500320#ifdef CONFIG_COMPAT
321COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence)
322{
323 return sys_lseek(fd, offset, whence);
324}
325#endif
326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327#ifdef __ARCH_WANT_SYS_LLSEEK
Heiko Carstens003d7ab2009-01-14 14:14:21 +0100328SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
329 unsigned long, offset_low, loff_t __user *, result,
Andrew Morton965c8e52012-12-17 15:59:39 -0800330 unsigned int, whence)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
332 int retval;
Eric Biggersd7a15f82014-03-16 14:24:08 -0500333 struct fd f = fdget_pos(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 loff_t offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Al Viro2903ff02012-08-28 12:52:22 -0400336 if (!f.file)
337 return -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
339 retval = -EINVAL;
Andrew Morton965c8e52012-12-17 15:59:39 -0800340 if (whence > SEEK_MAX)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 goto out_putf;
342
Al Viro2903ff02012-08-28 12:52:22 -0400343 offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low,
Andrew Morton965c8e52012-12-17 15:59:39 -0800344 whence);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346 retval = (int)offset;
347 if (offset >= 0) {
348 retval = -EFAULT;
349 if (!copy_to_user(result, &offset, sizeof(offset)))
350 retval = 0;
351 }
352out_putf:
Eric Biggersd7a15f82014-03-16 14:24:08 -0500353 fdput_pos(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 return retval;
355}
356#endif
357
Christoph Hellwigdbe4e192015-01-25 21:11:59 +0100358ssize_t vfs_iter_read(struct file *file, struct iov_iter *iter, loff_t *ppos)
359{
360 struct kiocb kiocb;
361 ssize_t ret;
362
363 if (!file->f_op->read_iter)
364 return -EINVAL;
365
366 init_sync_kiocb(&kiocb, file);
367 kiocb.ki_pos = *ppos;
Christoph Hellwigdbe4e192015-01-25 21:11:59 +0100368
369 iter->type |= READ;
370 ret = file->f_op->read_iter(&kiocb, iter);
Christoph Hellwig599bd192015-02-11 19:59:44 +0100371 BUG_ON(ret == -EIOCBQUEUED);
Christoph Hellwigdbe4e192015-01-25 21:11:59 +0100372 if (ret > 0)
373 *ppos = kiocb.ki_pos;
374 return ret;
375}
376EXPORT_SYMBOL(vfs_iter_read);
377
378ssize_t vfs_iter_write(struct file *file, struct iov_iter *iter, loff_t *ppos)
379{
380 struct kiocb kiocb;
381 ssize_t ret;
382
383 if (!file->f_op->write_iter)
384 return -EINVAL;
385
386 init_sync_kiocb(&kiocb, file);
387 kiocb.ki_pos = *ppos;
Christoph Hellwigdbe4e192015-01-25 21:11:59 +0100388
389 iter->type |= WRITE;
390 ret = file->f_op->write_iter(&kiocb, iter);
Christoph Hellwig599bd192015-02-11 19:59:44 +0100391 BUG_ON(ret == -EIOCBQUEUED);
Jimmy Durand Wesolowskic5cc9332019-01-31 15:19:39 +0100392 if (ret > 0) {
Christoph Hellwigdbe4e192015-01-25 21:11:59 +0100393 *ppos = kiocb.ki_pos;
Jimmy Durand Wesolowskic5cc9332019-01-31 15:19:39 +0100394 fsnotify_modify(file);
395 }
Christoph Hellwigdbe4e192015-01-25 21:11:59 +0100396 return ret;
397}
398EXPORT_SYMBOL(vfs_iter_write);
399
Al Viro68d70d02013-06-19 15:26:04 +0400400int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401{
402 struct inode *inode;
403 loff_t pos;
James Morrisc43e2592008-01-12 22:05:48 +1100404 int retval = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
Al Viro496ad9a2013-01-23 17:07:38 -0500406 inode = file_inode(file);
Linus Torvaldse28cc712006-01-04 16:20:40 -0800407 if (unlikely((ssize_t) count < 0))
James Morrisc43e2592008-01-12 22:05:48 +1100408 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 pos = *ppos;
Al Virocccb5a12010-12-17 07:44:05 -0500410 if (unlikely(pos < 0)) {
411 if (!unsigned_offsets(file))
412 return retval;
413 if (count >= -pos) /* both values are in 0..LLONG_MAX */
414 return -EOVERFLOW;
415 } else if (unlikely((loff_t) (pos + count) < 0)) {
416 if (!unsigned_offsets(file))
KAMEZAWA Hiroyuki4a3956c2010-10-01 14:20:22 -0700417 return retval;
418 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
Jeff Laytonbd61e0a2015-01-16 15:05:55 -0500420 if (unlikely(inode->i_flctx && mandatory_lock(inode))) {
Christoph Hellwigacc15572015-12-03 12:59:49 +0100421 retval = locks_mandatory_area(inode, file, pos, pos + count - 1,
422 read_write == READ ? F_RDLCK : F_WRLCK);
Linus Torvaldse28cc712006-01-04 16:20:40 -0800423 if (retval < 0)
424 return retval;
425 }
Al Virobc613842016-03-31 21:48:20 -0400426 return security_file_permission(file,
James Morrisc43e2592008-01-12 22:05:48 +1100427 read_write == READ ? MAY_READ : MAY_WRITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428}
429
Al Viro5d5d5682015-04-03 15:41:18 -0400430static ssize_t new_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
Al Viro293bc982014-02-11 18:37:41 -0500431{
432 struct iovec iov = { .iov_base = buf, .iov_len = len };
433 struct kiocb kiocb;
434 struct iov_iter iter;
435 ssize_t ret;
436
437 init_sync_kiocb(&kiocb, filp);
438 kiocb.ki_pos = *ppos;
Al Viro293bc982014-02-11 18:37:41 -0500439 iov_iter_init(&iter, READ, &iov, 1, len);
440
441 ret = filp->f_op->read_iter(&kiocb, &iter);
Christoph Hellwig599bd192015-02-11 19:59:44 +0100442 BUG_ON(ret == -EIOCBQUEUED);
Al Viro293bc982014-02-11 18:37:41 -0500443 *ppos = kiocb.ki_pos;
444 return ret;
445}
446
Dmitry Kasatkin6fb50322014-11-05 17:01:17 +0200447ssize_t __vfs_read(struct file *file, char __user *buf, size_t count,
448 loff_t *pos)
449{
Dmitry Kasatkin6fb50322014-11-05 17:01:17 +0200450 if (file->f_op->read)
Al Viro3d04c8a2015-04-03 15:09:18 -0400451 return file->f_op->read(file, buf, count, pos);
Dmitry Kasatkin6fb50322014-11-05 17:01:17 +0200452 else if (file->f_op->read_iter)
Al Viro3d04c8a2015-04-03 15:09:18 -0400453 return new_sync_read(file, buf, count, pos);
Dmitry Kasatkin6fb50322014-11-05 17:01:17 +0200454 else
Al Viro3d04c8a2015-04-03 15:09:18 -0400455 return -EINVAL;
Dmitry Kasatkin6fb50322014-11-05 17:01:17 +0200456}
Al Viro3d04c8a2015-04-03 15:09:18 -0400457EXPORT_SYMBOL(__vfs_read);
Dmitry Kasatkin6fb50322014-11-05 17:01:17 +0200458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
460{
461 ssize_t ret;
462
463 if (!(file->f_mode & FMODE_READ))
464 return -EBADF;
Al Viro7f7f25e2014-02-11 17:49:24 -0500465 if (!(file->f_mode & FMODE_CAN_READ))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 return -EINVAL;
467 if (unlikely(!access_ok(VERIFY_WRITE, buf, count)))
468 return -EFAULT;
469
470 ret = rw_verify_area(READ, file, pos, count);
Al Virobc613842016-03-31 21:48:20 -0400471 if (!ret) {
472 if (count > MAX_RW_COUNT)
473 count = MAX_RW_COUNT;
Dmitry Kasatkin6fb50322014-11-05 17:01:17 +0200474 ret = __vfs_read(file, buf, count, pos);
James Morrisc43e2592008-01-12 22:05:48 +1100475 if (ret > 0) {
Eric Paris2a12a9d2009-12-17 21:24:21 -0500476 fsnotify_access(file);
James Morrisc43e2592008-01-12 22:05:48 +1100477 add_rchar(current, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 }
James Morrisc43e2592008-01-12 22:05:48 +1100479 inc_syscr(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 }
481
482 return ret;
483}
484
485EXPORT_SYMBOL(vfs_read);
486
Al Viro5d5d5682015-04-03 15:41:18 -0400487static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
Al Viro293bc982014-02-11 18:37:41 -0500488{
489 struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
490 struct kiocb kiocb;
491 struct iov_iter iter;
492 ssize_t ret;
493
494 init_sync_kiocb(&kiocb, filp);
495 kiocb.ki_pos = *ppos;
Al Viro293bc982014-02-11 18:37:41 -0500496 iov_iter_init(&iter, WRITE, &iov, 1, len);
497
498 ret = filp->f_op->write_iter(&kiocb, &iter);
Christoph Hellwig599bd192015-02-11 19:59:44 +0100499 BUG_ON(ret == -EIOCBQUEUED);
Al Virof765b132015-04-06 20:50:38 -0400500 if (ret > 0)
501 *ppos = kiocb.ki_pos;
Al Viro293bc982014-02-11 18:37:41 -0500502 return ret;
503}
504
Al Viro493c84c2015-04-03 15:06:43 -0400505ssize_t __vfs_write(struct file *file, const char __user *p, size_t count,
506 loff_t *pos)
507{
508 if (file->f_op->write)
509 return file->f_op->write(file, p, count, pos);
Al Viro493c84c2015-04-03 15:06:43 -0400510 else if (file->f_op->write_iter)
511 return new_sync_write(file, p, count, pos);
512 else
513 return -EINVAL;
514}
515EXPORT_SYMBOL(__vfs_write);
516
Al Viro06ae43f2013-03-20 13:19:30 -0400517ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
518{
519 mm_segment_t old_fs;
520 const char __user *p;
521 ssize_t ret;
522
Al Viro7f7f25e2014-02-11 17:49:24 -0500523 if (!(file->f_mode & FMODE_CAN_WRITE))
Al Viro3e84f482013-03-27 15:20:30 +0000524 return -EINVAL;
525
Al Viro06ae43f2013-03-20 13:19:30 -0400526 old_fs = get_fs();
527 set_fs(get_ds());
528 p = (__force const char __user *)buf;
529 if (count > MAX_RW_COUNT)
530 count = MAX_RW_COUNT;
Al Viro493c84c2015-04-03 15:06:43 -0400531 ret = __vfs_write(file, p, count, pos);
Al Viro06ae43f2013-03-20 13:19:30 -0400532 set_fs(old_fs);
533 if (ret > 0) {
534 fsnotify_modify(file);
535 add_wchar(current, ret);
536 }
537 inc_syscw(current);
538 return ret;
539}
540
Al Viro2ec3a122014-08-19 11:48:09 -0400541EXPORT_SYMBOL(__kernel_write);
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
544{
545 ssize_t ret;
546
547 if (!(file->f_mode & FMODE_WRITE))
548 return -EBADF;
Al Viro7f7f25e2014-02-11 17:49:24 -0500549 if (!(file->f_mode & FMODE_CAN_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 return -EINVAL;
551 if (unlikely(!access_ok(VERIFY_READ, buf, count)))
552 return -EFAULT;
553
554 ret = rw_verify_area(WRITE, file, pos, count);
Al Virobc613842016-03-31 21:48:20 -0400555 if (!ret) {
556 if (count > MAX_RW_COUNT)
557 count = MAX_RW_COUNT;
Al Viro03d95eb2013-03-20 13:04:20 -0400558 file_start_write(file);
Al Viro493c84c2015-04-03 15:06:43 -0400559 ret = __vfs_write(file, buf, count, pos);
James Morrisc43e2592008-01-12 22:05:48 +1100560 if (ret > 0) {
Eric Paris2a12a9d2009-12-17 21:24:21 -0500561 fsnotify_modify(file);
James Morrisc43e2592008-01-12 22:05:48 +1100562 add_wchar(current, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 }
James Morrisc43e2592008-01-12 22:05:48 +1100564 inc_syscw(current);
Al Viro03d95eb2013-03-20 13:04:20 -0400565 file_end_write(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 }
567
568 return ret;
569}
570
571EXPORT_SYMBOL(vfs_write);
572
573static inline loff_t file_pos_read(struct file *file)
574{
Kirill Smelkov9c829b62019-03-26 22:20:43 +0000575 return file->f_mode & FMODE_STREAM ? 0 : file->f_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576}
577
578static inline void file_pos_write(struct file *file, loff_t pos)
579{
Kirill Smelkov9c829b62019-03-26 22:20:43 +0000580 if ((file->f_mode & FMODE_STREAM) == 0)
581 file->f_pos = pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582}
583
Heiko Carstens3cdad422009-01-14 14:14:22 +0100584SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585{
Linus Torvalds9c225f22014-03-03 09:36:58 -0800586 struct fd f = fdget_pos(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 ssize_t ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588
Al Viro2903ff02012-08-28 12:52:22 -0400589 if (f.file) {
590 loff_t pos = file_pos_read(f.file);
591 ret = vfs_read(f.file, buf, count, &pos);
Al Viro5faf1532013-06-15 05:49:36 +0400592 if (ret >= 0)
593 file_pos_write(f.file, pos);
Linus Torvalds9c225f22014-03-03 09:36:58 -0800594 fdput_pos(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 return ret;
597}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
Heiko Carstens3cdad422009-01-14 14:14:22 +0100599SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
600 size_t, count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601{
Linus Torvalds9c225f22014-03-03 09:36:58 -0800602 struct fd f = fdget_pos(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 ssize_t ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Al Viro2903ff02012-08-28 12:52:22 -0400605 if (f.file) {
606 loff_t pos = file_pos_read(f.file);
607 ret = vfs_write(f.file, buf, count, &pos);
Al Viro5faf1532013-06-15 05:49:36 +0400608 if (ret >= 0)
609 file_pos_write(f.file, pos);
Linus Torvalds9c225f22014-03-03 09:36:58 -0800610 fdput_pos(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 }
612
613 return ret;
614}
615
Al Viro4a0fd5b2013-01-21 15:16:58 -0500616SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf,
617 size_t, count, loff_t, pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618{
Al Viro2903ff02012-08-28 12:52:22 -0400619 struct fd f;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 ssize_t ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
622 if (pos < 0)
623 return -EINVAL;
624
Al Viro2903ff02012-08-28 12:52:22 -0400625 f = fdget(fd);
626 if (f.file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 ret = -ESPIPE;
Al Viro2903ff02012-08-28 12:52:22 -0400628 if (f.file->f_mode & FMODE_PREAD)
629 ret = vfs_read(f.file, buf, count, &pos);
630 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 }
632
633 return ret;
634}
635
Al Viro4a0fd5b2013-01-21 15:16:58 -0500636SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf,
637 size_t, count, loff_t, pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638{
Al Viro2903ff02012-08-28 12:52:22 -0400639 struct fd f;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 ssize_t ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642 if (pos < 0)
643 return -EINVAL;
644
Al Viro2903ff02012-08-28 12:52:22 -0400645 f = fdget(fd);
646 if (f.file) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 ret = -ESPIPE;
Al Viro2903ff02012-08-28 12:52:22 -0400648 if (f.file->f_mode & FMODE_PWRITE)
649 ret = vfs_write(f.file, buf, count, &pos);
650 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 }
652
653 return ret;
654}
655
656/*
657 * Reduce an iovec's length in-place. Return the resulting number of segments
658 */
659unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to)
660{
661 unsigned long seg = 0;
662 size_t len = 0;
663
664 while (seg < nr_segs) {
665 seg++;
666 if (len + iov->iov_len >= to) {
667 iov->iov_len = to - len;
668 break;
669 }
670 len += iov->iov_len;
671 iov++;
672 }
673 return seg;
674}
Eric Sandeen19295522008-01-28 23:58:27 -0500675EXPORT_SYMBOL(iov_shorten);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Al Viroac15ac02015-03-20 20:10:21 -0400677static ssize_t do_iter_readv_writev(struct file *filp, struct iov_iter *iter,
Miklos Szeredi04676262017-02-20 16:51:23 +0100678 loff_t *ppos, int type, int flags)
Al Viro293bc982014-02-11 18:37:41 -0500679{
680 struct kiocb kiocb;
Al Viro293bc982014-02-11 18:37:41 -0500681 ssize_t ret;
682
Christoph Hellwige864f392016-04-07 08:52:03 -0700683 if (flags & ~(RWF_HIPRI | RWF_DSYNC | RWF_SYNC))
Christoph Hellwig793b80e2016-03-03 16:03:58 +0100684 return -EOPNOTSUPP;
685
Al Viro293bc982014-02-11 18:37:41 -0500686 init_sync_kiocb(&kiocb, filp);
Christoph Hellwig97be7eb2016-03-03 16:04:01 +0100687 if (flags & RWF_HIPRI)
688 kiocb.ki_flags |= IOCB_HIPRI;
Christoph Hellwige864f392016-04-07 08:52:03 -0700689 if (flags & RWF_DSYNC)
690 kiocb.ki_flags |= IOCB_DSYNC;
691 if (flags & RWF_SYNC)
692 kiocb.ki_flags |= (IOCB_DSYNC | IOCB_SYNC);
Al Viro293bc982014-02-11 18:37:41 -0500693 kiocb.ki_pos = *ppos;
Al Viro293bc982014-02-11 18:37:41 -0500694
Miklos Szeredi04676262017-02-20 16:51:23 +0100695 if (type == READ)
696 ret = filp->f_op->read_iter(&kiocb, iter);
697 else
698 ret = filp->f_op->write_iter(&kiocb, iter);
Christoph Hellwig599bd192015-02-11 19:59:44 +0100699 BUG_ON(ret == -EIOCBQUEUED);
Al Viro293bc982014-02-11 18:37:41 -0500700 *ppos = kiocb.ki_pos;
701 return ret;
702}
703
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700704/* Do it by hand, with file-ops */
Al Viroac15ac02015-03-20 20:10:21 -0400705static ssize_t do_loop_readv_writev(struct file *filp, struct iov_iter *iter,
Miklos Szeredi04676262017-02-20 16:51:23 +0100706 loff_t *ppos, int type, int flags)
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700707{
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700708 ssize_t ret = 0;
709
Christoph Hellwig97be7eb2016-03-03 16:04:01 +0100710 if (flags & ~RWF_HIPRI)
Christoph Hellwig793b80e2016-03-03 16:03:58 +0100711 return -EOPNOTSUPP;
712
Al Viroac15ac02015-03-20 20:10:21 -0400713 while (iov_iter_count(iter)) {
714 struct iovec iovec = iov_iter_iovec(iter);
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700715 ssize_t nr;
716
Miklos Szeredi04676262017-02-20 16:51:23 +0100717 if (type == READ) {
718 nr = filp->f_op->read(filp, iovec.iov_base,
719 iovec.iov_len, ppos);
720 } else {
721 nr = filp->f_op->write(filp, iovec.iov_base,
722 iovec.iov_len, ppos);
723 }
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700724
725 if (nr < 0) {
726 if (!ret)
727 ret = nr;
728 break;
729 }
730 ret += nr;
Al Viroac15ac02015-03-20 20:10:21 -0400731 if (nr != iovec.iov_len)
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700732 break;
Al Viroac15ac02015-03-20 20:10:21 -0400733 iov_iter_advance(iter, nr);
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700734 }
735
736 return ret;
737}
738
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739/* A write operation does a read from user space and vice versa */
740#define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
741
Vegard Nossumffecee42016-10-08 11:18:07 +0200742/**
743 * rw_copy_check_uvector() - Copy an array of &struct iovec from userspace
744 * into the kernel and check that it is valid.
745 *
746 * @type: One of %CHECK_IOVEC_ONLY, %READ, or %WRITE.
747 * @uvector: Pointer to the userspace array.
748 * @nr_segs: Number of elements in userspace array.
749 * @fast_segs: Number of elements in @fast_pointer.
750 * @fast_pointer: Pointer to (usually small on-stack) kernel array.
751 * @ret_pointer: (output parameter) Pointer to a variable that will point to
752 * either @fast_pointer, a newly allocated kernel array, or NULL,
753 * depending on which array was used.
754 *
755 * This function copies an array of &struct iovec of @nr_segs from
756 * userspace into the kernel and checks that each element is valid (e.g.
757 * it does not point to a kernel address or cause overflow by being too
758 * large, etc.).
759 *
760 * As an optimization, the caller may provide a pointer to a small
761 * on-stack array in @fast_pointer, typically %UIO_FASTIOV elements long
762 * (the size of this array, or 0 if unused, should be given in @fast_segs).
763 *
764 * @ret_pointer will always point to the array that was used, so the
765 * caller must take care not to call kfree() on it e.g. in case the
766 * @fast_pointer array was used and it was allocated on the stack.
767 *
768 * Return: The total number of bytes covered by the iovec array on success
769 * or a negative error code on error.
770 */
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700771ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
772 unsigned long nr_segs, unsigned long fast_segs,
773 struct iovec *fast_pointer,
Christopher Yeohac34ebb2012-05-31 16:26:42 -0700774 struct iovec **ret_pointer)
Linus Torvalds435f49a2010-10-29 10:36:49 -0700775{
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700776 unsigned long seg;
Linus Torvalds435f49a2010-10-29 10:36:49 -0700777 ssize_t ret;
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700778 struct iovec *iov = fast_pointer;
779
Linus Torvalds435f49a2010-10-29 10:36:49 -0700780 /*
781 * SuS says "The readv() function *may* fail if the iovcnt argument
782 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
783 * traditionally returned zero for zero segments, so...
784 */
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700785 if (nr_segs == 0) {
786 ret = 0;
Linus Torvalds435f49a2010-10-29 10:36:49 -0700787 goto out;
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700788 }
789
Linus Torvalds435f49a2010-10-29 10:36:49 -0700790 /*
791 * First get the "struct iovec" from user memory and
792 * verify all the pointers
793 */
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700794 if (nr_segs > UIO_MAXIOV) {
795 ret = -EINVAL;
Linus Torvalds435f49a2010-10-29 10:36:49 -0700796 goto out;
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700797 }
798 if (nr_segs > fast_segs) {
Linus Torvalds435f49a2010-10-29 10:36:49 -0700799 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700800 if (iov == NULL) {
801 ret = -ENOMEM;
Linus Torvalds435f49a2010-10-29 10:36:49 -0700802 goto out;
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700803 }
Linus Torvalds435f49a2010-10-29 10:36:49 -0700804 }
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700805 if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) {
806 ret = -EFAULT;
Linus Torvalds435f49a2010-10-29 10:36:49 -0700807 goto out;
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700808 }
809
Linus Torvalds435f49a2010-10-29 10:36:49 -0700810 /*
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700811 * According to the Single Unix Specification we should return EINVAL
812 * if an element length is < 0 when cast to ssize_t or if the
813 * total length would overflow the ssize_t return value of the
814 * system call.
Linus Torvalds435f49a2010-10-29 10:36:49 -0700815 *
816 * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the
817 * overflow case.
818 */
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700819 ret = 0;
Linus Torvalds435f49a2010-10-29 10:36:49 -0700820 for (seg = 0; seg < nr_segs; seg++) {
821 void __user *buf = iov[seg].iov_base;
822 ssize_t len = (ssize_t)iov[seg].iov_len;
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700823
824 /* see if we we're about to use an invalid len or if
825 * it's about to overflow ssize_t */
Linus Torvalds435f49a2010-10-29 10:36:49 -0700826 if (len < 0) {
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700827 ret = -EINVAL;
Linus Torvalds435f49a2010-10-29 10:36:49 -0700828 goto out;
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700829 }
Christopher Yeohac34ebb2012-05-31 16:26:42 -0700830 if (type >= 0
Christopher Yeohfcf63402011-10-31 17:06:39 -0700831 && unlikely(!access_ok(vrfy_dir(type), buf, len))) {
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700832 ret = -EFAULT;
Linus Torvalds435f49a2010-10-29 10:36:49 -0700833 goto out;
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700834 }
Linus Torvalds435f49a2010-10-29 10:36:49 -0700835 if (len > MAX_RW_COUNT - ret) {
836 len = MAX_RW_COUNT - ret;
837 iov[seg].iov_len = len;
838 }
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700839 ret += len;
Linus Torvalds435f49a2010-10-29 10:36:49 -0700840 }
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700841out:
842 *ret_pointer = iov;
843 return ret;
844}
845
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846static ssize_t do_readv_writev(int type, struct file *file,
847 const struct iovec __user * uvector,
Christoph Hellwig793b80e2016-03-03 16:03:58 +0100848 unsigned long nr_segs, loff_t *pos,
849 int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 size_t tot_len;
852 struct iovec iovstack[UIO_FASTIOV];
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700853 struct iovec *iov = iovstack;
Al Viroac15ac02015-03-20 20:10:21 -0400854 struct iov_iter iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
Al Viro0504c072015-03-21 19:40:11 -0400857 ret = import_iovec(type, uvector, nr_segs,
858 ARRAY_SIZE(iovstack), &iov, &iter);
859 if (ret < 0)
860 return ret;
Badari Pulavartyeed4e512006-09-30 23:28:49 -0700861
Al Viro0504c072015-03-21 19:40:11 -0400862 tot_len = iov_iter_count(&iter);
863 if (!tot_len)
864 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 ret = rw_verify_area(type, file, pos, tot_len);
Linus Torvaldse28cc712006-01-04 16:20:40 -0800866 if (ret < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 goto out;
868
Miklos Szeredi04676262017-02-20 16:51:23 +0100869 if (type != READ)
Al Viro03d95eb2013-03-20 13:04:20 -0400870 file_start_write(file);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Miklos Szeredi04676262017-02-20 16:51:23 +0100872 if ((type == READ && file->f_op->read_iter) ||
873 (type == WRITE && file->f_op->write_iter))
874 ret = do_iter_readv_writev(file, &iter, pos, type, flags);
Badari Pulavartyee0b3e62006-09-30 23:28:47 -0700875 else
Miklos Szeredi04676262017-02-20 16:51:23 +0100876 ret = do_loop_readv_writev(file, &iter, pos, type, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877
Al Viro03d95eb2013-03-20 13:04:20 -0400878 if (type != READ)
879 file_end_write(file);
880
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881out:
Al Viro0504c072015-03-21 19:40:11 -0400882 kfree(iov);
Robert Love0eeca282005-07-12 17:06:03 -0400883 if ((ret + (type == READ)) > 0) {
884 if (type == READ)
Eric Paris2a12a9d2009-12-17 21:24:21 -0500885 fsnotify_access(file);
Robert Love0eeca282005-07-12 17:06:03 -0400886 else
Eric Paris2a12a9d2009-12-17 21:24:21 -0500887 fsnotify_modify(file);
Robert Love0eeca282005-07-12 17:06:03 -0400888 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890}
891
892ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
Christoph Hellwig793b80e2016-03-03 16:03:58 +0100893 unsigned long vlen, loff_t *pos, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894{
895 if (!(file->f_mode & FMODE_READ))
896 return -EBADF;
Al Viro7f7f25e2014-02-11 17:49:24 -0500897 if (!(file->f_mode & FMODE_CAN_READ))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 return -EINVAL;
899
Christoph Hellwig793b80e2016-03-03 16:03:58 +0100900 return do_readv_writev(READ, file, vec, vlen, pos, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901}
902
903EXPORT_SYMBOL(vfs_readv);
904
905ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
Christoph Hellwig793b80e2016-03-03 16:03:58 +0100906 unsigned long vlen, loff_t *pos, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907{
908 if (!(file->f_mode & FMODE_WRITE))
909 return -EBADF;
Al Viro7f7f25e2014-02-11 17:49:24 -0500910 if (!(file->f_mode & FMODE_CAN_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 return -EINVAL;
912
Christoph Hellwig793b80e2016-03-03 16:03:58 +0100913 return do_readv_writev(WRITE, file, vec, vlen, pos, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914}
915
916EXPORT_SYMBOL(vfs_writev);
917
Milosz Tanskif17d8b32016-03-03 16:03:59 +0100918static ssize_t do_readv(unsigned long fd, const struct iovec __user *vec,
919 unsigned long vlen, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920{
Linus Torvalds9c225f22014-03-03 09:36:58 -0800921 struct fd f = fdget_pos(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 ssize_t ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
Al Viro2903ff02012-08-28 12:52:22 -0400924 if (f.file) {
925 loff_t pos = file_pos_read(f.file);
Milosz Tanskif17d8b32016-03-03 16:03:59 +0100926 ret = vfs_readv(f.file, vec, vlen, &pos, flags);
Al Viro5faf1532013-06-15 05:49:36 +0400927 if (ret >= 0)
928 file_pos_write(f.file, pos);
Linus Torvalds9c225f22014-03-03 09:36:58 -0800929 fdput_pos(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 }
931
932 if (ret > 0)
Alexey Dobriyan4b98d112007-02-10 01:46:45 -0800933 add_rchar(current, ret);
934 inc_syscr(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 return ret;
936}
937
Milosz Tanskif17d8b32016-03-03 16:03:59 +0100938static ssize_t do_writev(unsigned long fd, const struct iovec __user *vec,
939 unsigned long vlen, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940{
Linus Torvalds9c225f22014-03-03 09:36:58 -0800941 struct fd f = fdget_pos(fd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 ssize_t ret = -EBADF;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
Al Viro2903ff02012-08-28 12:52:22 -0400944 if (f.file) {
945 loff_t pos = file_pos_read(f.file);
Milosz Tanskif17d8b32016-03-03 16:03:59 +0100946 ret = vfs_writev(f.file, vec, vlen, &pos, flags);
Al Viro5faf1532013-06-15 05:49:36 +0400947 if (ret >= 0)
948 file_pos_write(f.file, pos);
Linus Torvalds9c225f22014-03-03 09:36:58 -0800949 fdput_pos(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700950 }
951
952 if (ret > 0)
Alexey Dobriyan4b98d112007-02-10 01:46:45 -0800953 add_wchar(current, ret);
954 inc_syscw(current);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955 return ret;
956}
957
Linus Torvalds601cc112009-04-03 08:03:22 -0700958static inline loff_t pos_from_hilo(unsigned long high, unsigned long low)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -0700959{
Linus Torvalds601cc112009-04-03 08:03:22 -0700960#define HALF_LONG_BITS (BITS_PER_LONG / 2)
961 return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low;
962}
963
Milosz Tanskif17d8b32016-03-03 16:03:59 +0100964static ssize_t do_preadv(unsigned long fd, const struct iovec __user *vec,
965 unsigned long vlen, loff_t pos, int flags)
Linus Torvalds601cc112009-04-03 08:03:22 -0700966{
Al Viro2903ff02012-08-28 12:52:22 -0400967 struct fd f;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -0700968 ssize_t ret = -EBADF;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -0700969
970 if (pos < 0)
971 return -EINVAL;
972
Al Viro2903ff02012-08-28 12:52:22 -0400973 f = fdget(fd);
974 if (f.file) {
Gerd Hoffmannf3554f42009-04-02 16:59:23 -0700975 ret = -ESPIPE;
Al Viro2903ff02012-08-28 12:52:22 -0400976 if (f.file->f_mode & FMODE_PREAD)
Milosz Tanskif17d8b32016-03-03 16:03:59 +0100977 ret = vfs_readv(f.file, vec, vlen, &pos, flags);
Al Viro2903ff02012-08-28 12:52:22 -0400978 fdput(f);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -0700979 }
980
981 if (ret > 0)
982 add_rchar(current, ret);
983 inc_syscr(current);
984 return ret;
985}
986
Milosz Tanskif17d8b32016-03-03 16:03:59 +0100987static ssize_t do_pwritev(unsigned long fd, const struct iovec __user *vec,
988 unsigned long vlen, loff_t pos, int flags)
Gerd Hoffmannf3554f42009-04-02 16:59:23 -0700989{
Al Viro2903ff02012-08-28 12:52:22 -0400990 struct fd f;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -0700991 ssize_t ret = -EBADF;
Gerd Hoffmannf3554f42009-04-02 16:59:23 -0700992
993 if (pos < 0)
994 return -EINVAL;
995
Al Viro2903ff02012-08-28 12:52:22 -0400996 f = fdget(fd);
997 if (f.file) {
Gerd Hoffmannf3554f42009-04-02 16:59:23 -0700998 ret = -ESPIPE;
Al Viro2903ff02012-08-28 12:52:22 -0400999 if (f.file->f_mode & FMODE_PWRITE)
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001000 ret = vfs_writev(f.file, vec, vlen, &pos, flags);
Al Viro2903ff02012-08-28 12:52:22 -04001001 fdput(f);
Gerd Hoffmannf3554f42009-04-02 16:59:23 -07001002 }
1003
1004 if (ret > 0)
1005 add_wchar(current, ret);
1006 inc_syscw(current);
1007 return ret;
1008}
1009
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001010SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
1011 unsigned long, vlen)
1012{
1013 return do_readv(fd, vec, vlen, 0);
1014}
1015
1016SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
1017 unsigned long, vlen)
1018{
1019 return do_writev(fd, vec, vlen, 0);
1020}
1021
1022SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec,
1023 unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h)
1024{
1025 loff_t pos = pos_from_hilo(pos_h, pos_l);
1026
1027 return do_preadv(fd, vec, vlen, pos, 0);
1028}
1029
1030SYSCALL_DEFINE6(preadv2, unsigned long, fd, const struct iovec __user *, vec,
1031 unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h,
1032 int, flags)
1033{
1034 loff_t pos = pos_from_hilo(pos_h, pos_l);
1035
1036 if (pos == -1)
1037 return do_readv(fd, vec, vlen, flags);
1038
1039 return do_preadv(fd, vec, vlen, pos, flags);
1040}
1041
1042SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
1043 unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h)
1044{
1045 loff_t pos = pos_from_hilo(pos_h, pos_l);
1046
1047 return do_pwritev(fd, vec, vlen, pos, 0);
1048}
1049
1050SYSCALL_DEFINE6(pwritev2, unsigned long, fd, const struct iovec __user *, vec,
1051 unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h,
1052 int, flags)
1053{
1054 loff_t pos = pos_from_hilo(pos_h, pos_l);
1055
1056 if (pos == -1)
1057 return do_writev(fd, vec, vlen, flags);
1058
1059 return do_pwritev(fd, vec, vlen, pos, flags);
1060}
1061
Al Viro72ec3512013-03-20 10:42:10 -04001062#ifdef CONFIG_COMPAT
1063
1064static ssize_t compat_do_readv_writev(int type, struct file *file,
1065 const struct compat_iovec __user *uvector,
Christoph Hellwig793b80e2016-03-03 16:03:58 +01001066 unsigned long nr_segs, loff_t *pos,
1067 int flags)
Al Viro72ec3512013-03-20 10:42:10 -04001068{
1069 compat_ssize_t tot_len;
1070 struct iovec iovstack[UIO_FASTIOV];
1071 struct iovec *iov = iovstack;
Al Viroac15ac02015-03-20 20:10:21 -04001072 struct iov_iter iter;
Al Viro72ec3512013-03-20 10:42:10 -04001073 ssize_t ret;
Al Viro72ec3512013-03-20 10:42:10 -04001074
Al Viro0504c072015-03-21 19:40:11 -04001075 ret = compat_import_iovec(type, uvector, nr_segs,
1076 UIO_FASTIOV, &iov, &iter);
1077 if (ret < 0)
1078 return ret;
Al Viro72ec3512013-03-20 10:42:10 -04001079
Al Viro0504c072015-03-21 19:40:11 -04001080 tot_len = iov_iter_count(&iter);
1081 if (!tot_len)
1082 goto out;
Al Viro72ec3512013-03-20 10:42:10 -04001083 ret = rw_verify_area(type, file, pos, tot_len);
1084 if (ret < 0)
1085 goto out;
1086
Miklos Szeredi04676262017-02-20 16:51:23 +01001087 if (type != READ)
Al Viro03d95eb2013-03-20 13:04:20 -04001088 file_start_write(file);
Al Viro72ec3512013-03-20 10:42:10 -04001089
Miklos Szeredi04676262017-02-20 16:51:23 +01001090 if ((type == READ && file->f_op->read_iter) ||
1091 (type == WRITE && file->f_op->write_iter))
1092 ret = do_iter_readv_writev(file, &iter, pos, type, flags);
Al Viro03d95eb2013-03-20 13:04:20 -04001093 else
Miklos Szeredi04676262017-02-20 16:51:23 +01001094 ret = do_loop_readv_writev(file, &iter, pos, type, flags);
Al Viro72ec3512013-03-20 10:42:10 -04001095
Al Viro03d95eb2013-03-20 13:04:20 -04001096 if (type != READ)
1097 file_end_write(file);
1098
Al Viro72ec3512013-03-20 10:42:10 -04001099out:
Al Viro0504c072015-03-21 19:40:11 -04001100 kfree(iov);
Al Viro72ec3512013-03-20 10:42:10 -04001101 if ((ret + (type == READ)) > 0) {
1102 if (type == READ)
1103 fsnotify_access(file);
1104 else
1105 fsnotify_modify(file);
1106 }
1107 return ret;
1108}
1109
1110static size_t compat_readv(struct file *file,
1111 const struct compat_iovec __user *vec,
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001112 unsigned long vlen, loff_t *pos, int flags)
Al Viro72ec3512013-03-20 10:42:10 -04001113{
1114 ssize_t ret = -EBADF;
1115
1116 if (!(file->f_mode & FMODE_READ))
1117 goto out;
1118
1119 ret = -EINVAL;
Al Viro7f7f25e2014-02-11 17:49:24 -05001120 if (!(file->f_mode & FMODE_CAN_READ))
Al Viro72ec3512013-03-20 10:42:10 -04001121 goto out;
1122
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001123 ret = compat_do_readv_writev(READ, file, vec, vlen, pos, flags);
Al Viro72ec3512013-03-20 10:42:10 -04001124
1125out:
1126 if (ret > 0)
1127 add_rchar(current, ret);
1128 inc_syscr(current);
1129 return ret;
1130}
1131
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001132static size_t do_compat_readv(compat_ulong_t fd,
1133 const struct compat_iovec __user *vec,
1134 compat_ulong_t vlen, int flags)
Al Viro72ec3512013-03-20 10:42:10 -04001135{
Linus Torvalds9c225f22014-03-03 09:36:58 -08001136 struct fd f = fdget_pos(fd);
Al Viro72ec3512013-03-20 10:42:10 -04001137 ssize_t ret;
1138 loff_t pos;
1139
1140 if (!f.file)
1141 return -EBADF;
1142 pos = f.file->f_pos;
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001143 ret = compat_readv(f.file, vec, vlen, &pos, flags);
Al Viro5faf1532013-06-15 05:49:36 +04001144 if (ret >= 0)
1145 f.file->f_pos = pos;
Linus Torvalds9c225f22014-03-03 09:36:58 -08001146 fdput_pos(f);
Al Viro72ec3512013-03-20 10:42:10 -04001147 return ret;
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001148
Al Viro72ec3512013-03-20 10:42:10 -04001149}
1150
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001151COMPAT_SYSCALL_DEFINE3(readv, compat_ulong_t, fd,
1152 const struct compat_iovec __user *,vec,
1153 compat_ulong_t, vlen)
1154{
1155 return do_compat_readv(fd, vec, vlen, 0);
1156}
1157
1158static long do_compat_preadv64(unsigned long fd,
Heiko Carstens378a10f2014-03-05 10:43:51 +01001159 const struct compat_iovec __user *vec,
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001160 unsigned long vlen, loff_t pos, int flags)
Al Viro72ec3512013-03-20 10:42:10 -04001161{
1162 struct fd f;
1163 ssize_t ret;
1164
1165 if (pos < 0)
1166 return -EINVAL;
1167 f = fdget(fd);
1168 if (!f.file)
1169 return -EBADF;
1170 ret = -ESPIPE;
1171 if (f.file->f_mode & FMODE_PREAD)
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001172 ret = compat_readv(f.file, vec, vlen, &pos, flags);
Al Viro72ec3512013-03-20 10:42:10 -04001173 fdput(f);
1174 return ret;
1175}
1176
Heiko Carstens378a10f2014-03-05 10:43:51 +01001177#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64
1178COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
1179 const struct compat_iovec __user *,vec,
1180 unsigned long, vlen, loff_t, pos)
1181{
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001182 return do_compat_preadv64(fd, vec, vlen, pos, 0);
Heiko Carstens378a10f2014-03-05 10:43:51 +01001183}
1184#endif
1185
Heiko Carstensdfd948e2014-01-29 14:05:44 -08001186COMPAT_SYSCALL_DEFINE5(preadv, compat_ulong_t, fd,
Al Viro72ec3512013-03-20 10:42:10 -04001187 const struct compat_iovec __user *,vec,
Heiko Carstensdfd948e2014-01-29 14:05:44 -08001188 compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
Al Viro72ec3512013-03-20 10:42:10 -04001189{
1190 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
Heiko Carstens378a10f2014-03-05 10:43:51 +01001191
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001192 return do_compat_preadv64(fd, vec, vlen, pos, 0);
1193}
1194
H.J. Lu3ebfd812016-07-14 12:31:53 -07001195#ifdef __ARCH_WANT_COMPAT_SYS_PREADV64V2
1196COMPAT_SYSCALL_DEFINE5(preadv64v2, unsigned long, fd,
1197 const struct compat_iovec __user *,vec,
1198 unsigned long, vlen, loff_t, pos, int, flags)
1199{
Aurelien Jarno24c6f9f2018-12-06 20:05:34 +01001200 if (pos == -1)
1201 return do_compat_readv(fd, vec, vlen, flags);
1202
H.J. Lu3ebfd812016-07-14 12:31:53 -07001203 return do_compat_preadv64(fd, vec, vlen, pos, flags);
1204}
1205#endif
1206
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001207COMPAT_SYSCALL_DEFINE6(preadv2, compat_ulong_t, fd,
1208 const struct compat_iovec __user *,vec,
1209 compat_ulong_t, vlen, u32, pos_low, u32, pos_high,
1210 int, flags)
1211{
1212 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1213
1214 if (pos == -1)
1215 return do_compat_readv(fd, vec, vlen, flags);
1216
1217 return do_compat_preadv64(fd, vec, vlen, pos, flags);
Al Viro72ec3512013-03-20 10:42:10 -04001218}
1219
1220static size_t compat_writev(struct file *file,
1221 const struct compat_iovec __user *vec,
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001222 unsigned long vlen, loff_t *pos, int flags)
Al Viro72ec3512013-03-20 10:42:10 -04001223{
1224 ssize_t ret = -EBADF;
1225
1226 if (!(file->f_mode & FMODE_WRITE))
1227 goto out;
1228
1229 ret = -EINVAL;
Al Viro7f7f25e2014-02-11 17:49:24 -05001230 if (!(file->f_mode & FMODE_CAN_WRITE))
Al Viro72ec3512013-03-20 10:42:10 -04001231 goto out;
1232
Christoph Hellwig222aa342017-06-16 11:08:24 +02001233 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos, flags);
Al Viro72ec3512013-03-20 10:42:10 -04001234
1235out:
1236 if (ret > 0)
1237 add_wchar(current, ret);
1238 inc_syscw(current);
1239 return ret;
1240}
1241
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001242static size_t do_compat_writev(compat_ulong_t fd,
1243 const struct compat_iovec __user* vec,
1244 compat_ulong_t vlen, int flags)
Al Viro72ec3512013-03-20 10:42:10 -04001245{
Linus Torvalds9c225f22014-03-03 09:36:58 -08001246 struct fd f = fdget_pos(fd);
Al Viro72ec3512013-03-20 10:42:10 -04001247 ssize_t ret;
1248 loff_t pos;
1249
1250 if (!f.file)
1251 return -EBADF;
1252 pos = f.file->f_pos;
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001253 ret = compat_writev(f.file, vec, vlen, &pos, flags);
Al Viro5faf1532013-06-15 05:49:36 +04001254 if (ret >= 0)
1255 f.file->f_pos = pos;
Linus Torvalds9c225f22014-03-03 09:36:58 -08001256 fdput_pos(f);
Al Viro72ec3512013-03-20 10:42:10 -04001257 return ret;
1258}
1259
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001260COMPAT_SYSCALL_DEFINE3(writev, compat_ulong_t, fd,
1261 const struct compat_iovec __user *, vec,
1262 compat_ulong_t, vlen)
1263{
1264 return do_compat_writev(fd, vec, vlen, 0);
1265}
1266
1267static long do_compat_pwritev64(unsigned long fd,
Heiko Carstens378a10f2014-03-05 10:43:51 +01001268 const struct compat_iovec __user *vec,
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001269 unsigned long vlen, loff_t pos, int flags)
Al Viro72ec3512013-03-20 10:42:10 -04001270{
1271 struct fd f;
1272 ssize_t ret;
1273
1274 if (pos < 0)
1275 return -EINVAL;
1276 f = fdget(fd);
1277 if (!f.file)
1278 return -EBADF;
1279 ret = -ESPIPE;
1280 if (f.file->f_mode & FMODE_PWRITE)
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001281 ret = compat_writev(f.file, vec, vlen, &pos, flags);
Al Viro72ec3512013-03-20 10:42:10 -04001282 fdput(f);
1283 return ret;
1284}
1285
Heiko Carstens378a10f2014-03-05 10:43:51 +01001286#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64
1287COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
1288 const struct compat_iovec __user *,vec,
1289 unsigned long, vlen, loff_t, pos)
1290{
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001291 return do_compat_pwritev64(fd, vec, vlen, pos, 0);
Heiko Carstens378a10f2014-03-05 10:43:51 +01001292}
1293#endif
1294
Heiko Carstensdfd948e2014-01-29 14:05:44 -08001295COMPAT_SYSCALL_DEFINE5(pwritev, compat_ulong_t, fd,
Al Viro72ec3512013-03-20 10:42:10 -04001296 const struct compat_iovec __user *,vec,
Heiko Carstensdfd948e2014-01-29 14:05:44 -08001297 compat_ulong_t, vlen, u32, pos_low, u32, pos_high)
Al Viro72ec3512013-03-20 10:42:10 -04001298{
1299 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
Heiko Carstens378a10f2014-03-05 10:43:51 +01001300
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001301 return do_compat_pwritev64(fd, vec, vlen, pos, 0);
Al Viro72ec3512013-03-20 10:42:10 -04001302}
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001303
H.J. Lu3ebfd812016-07-14 12:31:53 -07001304#ifdef __ARCH_WANT_COMPAT_SYS_PWRITEV64V2
1305COMPAT_SYSCALL_DEFINE5(pwritev64v2, unsigned long, fd,
1306 const struct compat_iovec __user *,vec,
1307 unsigned long, vlen, loff_t, pos, int, flags)
1308{
Aurelien Jarno24c6f9f2018-12-06 20:05:34 +01001309 if (pos == -1)
1310 return do_compat_writev(fd, vec, vlen, flags);
1311
H.J. Lu3ebfd812016-07-14 12:31:53 -07001312 return do_compat_pwritev64(fd, vec, vlen, pos, flags);
1313}
1314#endif
1315
Milosz Tanskif17d8b32016-03-03 16:03:59 +01001316COMPAT_SYSCALL_DEFINE6(pwritev2, compat_ulong_t, fd,
1317 const struct compat_iovec __user *,vec,
1318 compat_ulong_t, vlen, u32, pos_low, u32, pos_high, int, flags)
1319{
1320 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1321
1322 if (pos == -1)
1323 return do_compat_writev(fd, vec, vlen, flags);
1324
1325 return do_compat_pwritev64(fd, vec, vlen, pos, flags);
1326}
1327
Al Viro72ec3512013-03-20 10:42:10 -04001328#endif
1329
Al Viro19f4fc32013-02-24 02:17:03 -05001330static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
1331 size_t count, loff_t max)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332{
Al Viro2903ff02012-08-28 12:52:22 -04001333 struct fd in, out;
1334 struct inode *in_inode, *out_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 loff_t pos;
Al Viro7995bd22013-06-20 18:58:36 +04001336 loff_t out_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 ssize_t retval;
Al Viro2903ff02012-08-28 12:52:22 -04001338 int fl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
1340 /*
1341 * Get input file, and verify that it is ok..
1342 */
1343 retval = -EBADF;
Al Viro2903ff02012-08-28 12:52:22 -04001344 in = fdget(in_fd);
1345 if (!in.file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346 goto out;
Al Viro2903ff02012-08-28 12:52:22 -04001347 if (!(in.file->f_mode & FMODE_READ))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 goto fput_in;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 retval = -ESPIPE;
Al Viro7995bd22013-06-20 18:58:36 +04001350 if (!ppos) {
1351 pos = in.file->f_pos;
1352 } else {
1353 pos = *ppos;
Al Viro2903ff02012-08-28 12:52:22 -04001354 if (!(in.file->f_mode & FMODE_PREAD))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 goto fput_in;
Al Viro7995bd22013-06-20 18:58:36 +04001356 }
1357 retval = rw_verify_area(READ, in.file, &pos, count);
Linus Torvaldse28cc712006-01-04 16:20:40 -08001358 if (retval < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359 goto fput_in;
Al Virobc613842016-03-31 21:48:20 -04001360 if (count > MAX_RW_COUNT)
1361 count = MAX_RW_COUNT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 /*
1364 * Get output file, and verify that it is ok..
1365 */
1366 retval = -EBADF;
Al Viro2903ff02012-08-28 12:52:22 -04001367 out = fdget(out_fd);
1368 if (!out.file)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 goto fput_in;
Al Viro2903ff02012-08-28 12:52:22 -04001370 if (!(out.file->f_mode & FMODE_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 goto fput_out;
1372 retval = -EINVAL;
Al Viro496ad9a2013-01-23 17:07:38 -05001373 in_inode = file_inode(in.file);
1374 out_inode = file_inode(out.file);
Al Viro7995bd22013-06-20 18:58:36 +04001375 out_pos = out.file->f_pos;
1376 retval = rw_verify_area(WRITE, out.file, &out_pos, count);
Linus Torvaldse28cc712006-01-04 16:20:40 -08001377 if (retval < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001378 goto fput_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 if (!max)
1381 max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);
1382
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 if (unlikely(pos + count > max)) {
1384 retval = -EOVERFLOW;
1385 if (pos >= max)
1386 goto fput_out;
1387 count = max - pos;
1388 }
1389
Jens Axboed96e6e72007-06-11 12:18:52 +02001390 fl = 0;
Jens Axboe534f2aa2007-06-01 14:52:37 +02001391#if 0
Jens Axboed96e6e72007-06-11 12:18:52 +02001392 /*
1393 * We need to debate whether we can enable this or not. The
1394 * man page documents EAGAIN return for the output at least,
1395 * and the application is arguably buggy if it doesn't expect
1396 * EAGAIN on a non-blocking file descriptor.
1397 */
Al Viro2903ff02012-08-28 12:52:22 -04001398 if (in.file->f_flags & O_NONBLOCK)
Jens Axboed96e6e72007-06-11 12:18:52 +02001399 fl = SPLICE_F_NONBLOCK;
Jens Axboe534f2aa2007-06-01 14:52:37 +02001400#endif
Al Viro50cd2c52013-05-23 20:10:34 -04001401 file_start_write(out.file);
Al Viro7995bd22013-06-20 18:58:36 +04001402 retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl);
Al Viro50cd2c52013-05-23 20:10:34 -04001403 file_end_write(out.file);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404
1405 if (retval > 0) {
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001406 add_rchar(current, retval);
1407 add_wchar(current, retval);
Scott Wolchoka68c2f12012-12-20 15:05:52 -08001408 fsnotify_access(in.file);
1409 fsnotify_modify(out.file);
Al Viro7995bd22013-06-20 18:58:36 +04001410 out.file->f_pos = out_pos;
1411 if (ppos)
1412 *ppos = pos;
1413 else
1414 in.file->f_pos = pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416
Alexey Dobriyan4b98d112007-02-10 01:46:45 -08001417 inc_syscr(current);
1418 inc_syscw(current);
Al Viro7995bd22013-06-20 18:58:36 +04001419 if (pos > max)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 retval = -EOVERFLOW;
1421
1422fput_out:
Al Viro2903ff02012-08-28 12:52:22 -04001423 fdput(out);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424fput_in:
Al Viro2903ff02012-08-28 12:52:22 -04001425 fdput(in);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426out:
1427 return retval;
1428}
1429
Heiko Carstens002c8972009-01-14 14:14:18 +01001430SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_t, count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001431{
1432 loff_t pos;
1433 off_t off;
1434 ssize_t ret;
1435
1436 if (offset) {
1437 if (unlikely(get_user(off, offset)))
1438 return -EFAULT;
1439 pos = off;
1440 ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
1441 if (unlikely(put_user(pos, offset)))
1442 return -EFAULT;
1443 return ret;
1444 }
1445
1446 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1447}
1448
Heiko Carstens002c8972009-01-14 14:14:18 +01001449SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450{
1451 loff_t pos;
1452 ssize_t ret;
1453
1454 if (offset) {
1455 if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
1456 return -EFAULT;
1457 ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
1458 if (unlikely(put_user(pos, offset)))
1459 return -EFAULT;
1460 return ret;
1461 }
1462
1463 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1464}
Al Viro19f4fc32013-02-24 02:17:03 -05001465
1466#ifdef CONFIG_COMPAT
1467COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd,
1468 compat_off_t __user *, offset, compat_size_t, count)
1469{
1470 loff_t pos;
1471 off_t off;
1472 ssize_t ret;
1473
1474 if (offset) {
1475 if (unlikely(get_user(off, offset)))
1476 return -EFAULT;
1477 pos = off;
1478 ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
1479 if (unlikely(put_user(pos, offset)))
1480 return -EFAULT;
1481 return ret;
1482 }
1483
1484 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1485}
1486
1487COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd,
1488 compat_loff_t __user *, offset, compat_size_t, count)
1489{
1490 loff_t pos;
1491 ssize_t ret;
1492
1493 if (offset) {
1494 if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
1495 return -EFAULT;
1496 ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
1497 if (unlikely(put_user(pos, offset)))
1498 return -EFAULT;
1499 return ret;
1500 }
1501
1502 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1503}
1504#endif
Zach Brown29732932015-11-10 16:53:30 -05001505
1506/*
1507 * copy_file_range() differs from regular file read and write in that it
1508 * specifically allows return partial success. When it does so is up to
1509 * the copy_file_range method.
1510 */
1511ssize_t vfs_copy_file_range(struct file *file_in, loff_t pos_in,
1512 struct file *file_out, loff_t pos_out,
1513 size_t len, unsigned int flags)
1514{
1515 struct inode *inode_in = file_inode(file_in);
1516 struct inode *inode_out = file_inode(file_out);
1517 ssize_t ret;
1518
1519 if (flags != 0)
1520 return -EINVAL;
1521
Amir Goldstein27db1f02017-01-31 10:34:56 +02001522 if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
1523 return -EISDIR;
1524 if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
1525 return -EINVAL;
1526
Zach Brown29732932015-11-10 16:53:30 -05001527 ret = rw_verify_area(READ, file_in, &pos_in, len);
Al Virobc613842016-03-31 21:48:20 -04001528 if (unlikely(ret))
1529 return ret;
1530
1531 ret = rw_verify_area(WRITE, file_out, &pos_out, len);
1532 if (unlikely(ret))
Zach Brown29732932015-11-10 16:53:30 -05001533 return ret;
1534
1535 if (!(file_in->f_mode & FMODE_READ) ||
1536 !(file_out->f_mode & FMODE_WRITE) ||
Anna Schumakereac70052015-11-10 16:53:33 -05001537 (file_out->f_flags & O_APPEND))
Zach Brown29732932015-11-10 16:53:30 -05001538 return -EBADF;
1539
1540 /* this could be relaxed once a method supports cross-fs copies */
1541 if (inode_in->i_sb != inode_out->i_sb)
1542 return -EXDEV;
1543
1544 if (len == 0)
1545 return 0;
1546
1547 ret = mnt_want_write_file(file_out);
1548 if (ret)
1549 return ret;
1550
Anna Schumakereac70052015-11-10 16:53:33 -05001551 ret = -EOPNOTSUPP;
1552 if (file_out->f_op->copy_file_range)
1553 ret = file_out->f_op->copy_file_range(file_in, pos_in, file_out,
1554 pos_out, len, flags);
1555 if (ret == -EOPNOTSUPP)
1556 ret = do_splice_direct(file_in, &pos_in, file_out, &pos_out,
1557 len > MAX_RW_COUNT ? MAX_RW_COUNT : len, 0);
1558
Zach Brown29732932015-11-10 16:53:30 -05001559 if (ret > 0) {
1560 fsnotify_access(file_in);
1561 add_rchar(current, ret);
1562 fsnotify_modify(file_out);
1563 add_wchar(current, ret);
1564 }
1565 inc_syscr(current);
1566 inc_syscw(current);
1567
1568 mnt_drop_write_file(file_out);
1569
1570 return ret;
1571}
1572EXPORT_SYMBOL(vfs_copy_file_range);
1573
1574SYSCALL_DEFINE6(copy_file_range, int, fd_in, loff_t __user *, off_in,
1575 int, fd_out, loff_t __user *, off_out,
1576 size_t, len, unsigned int, flags)
1577{
1578 loff_t pos_in;
1579 loff_t pos_out;
1580 struct fd f_in;
1581 struct fd f_out;
1582 ssize_t ret = -EBADF;
1583
1584 f_in = fdget(fd_in);
1585 if (!f_in.file)
1586 goto out2;
1587
1588 f_out = fdget(fd_out);
1589 if (!f_out.file)
1590 goto out1;
1591
1592 ret = -EFAULT;
1593 if (off_in) {
1594 if (copy_from_user(&pos_in, off_in, sizeof(loff_t)))
1595 goto out;
1596 } else {
1597 pos_in = f_in.file->f_pos;
1598 }
1599
1600 if (off_out) {
1601 if (copy_from_user(&pos_out, off_out, sizeof(loff_t)))
1602 goto out;
1603 } else {
1604 pos_out = f_out.file->f_pos;
1605 }
1606
1607 ret = vfs_copy_file_range(f_in.file, pos_in, f_out.file, pos_out, len,
1608 flags);
1609 if (ret > 0) {
1610 pos_in += ret;
1611 pos_out += ret;
1612
1613 if (off_in) {
1614 if (copy_to_user(off_in, &pos_in, sizeof(loff_t)))
1615 ret = -EFAULT;
1616 } else {
1617 f_in.file->f_pos = pos_in;
1618 }
1619
1620 if (off_out) {
1621 if (copy_to_user(off_out, &pos_out, sizeof(loff_t)))
1622 ret = -EFAULT;
1623 } else {
1624 f_out.file->f_pos = pos_out;
1625 }
1626 }
1627
1628out:
1629 fdput(f_out);
1630out1:
1631 fdput(f_in);
1632out2:
1633 return ret;
1634}
Christoph Hellwig04b38d62015-12-03 12:59:50 +01001635
1636static int clone_verify_area(struct file *file, loff_t pos, u64 len, bool write)
1637{
1638 struct inode *inode = file_inode(file);
1639
1640 if (unlikely(pos < 0))
1641 return -EINVAL;
1642
1643 if (unlikely((loff_t) (pos + len) < 0))
1644 return -EINVAL;
1645
1646 if (unlikely(inode->i_flctx && mandatory_lock(inode))) {
1647 loff_t end = len ? pos + len - 1 : OFFSET_MAX;
1648 int retval;
1649
1650 retval = locks_mandatory_area(inode, file, pos, end,
1651 write ? F_WRLCK : F_RDLCK);
1652 if (retval < 0)
1653 return retval;
1654 }
1655
1656 return security_file_permission(file, write ? MAY_WRITE : MAY_READ);
1657}
1658
1659int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
1660 struct file *file_out, loff_t pos_out, u64 len)
1661{
1662 struct inode *inode_in = file_inode(file_in);
1663 struct inode *inode_out = file_inode(file_out);
1664 int ret;
1665
1666 if (inode_in->i_sb != inode_out->i_sb ||
1667 file_in->f_path.mnt != file_out->f_path.mnt)
1668 return -EXDEV;
1669
1670 if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
1671 return -EISDIR;
1672 if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
Darrick J. Wongd79bdd52015-12-19 00:55:52 -08001673 return -EINVAL;
Christoph Hellwig04b38d62015-12-03 12:59:50 +01001674
1675 if (!(file_in->f_mode & FMODE_READ) ||
1676 !(file_out->f_mode & FMODE_WRITE) ||
Christoph Hellwig0fcbf992016-02-26 18:53:12 +01001677 (file_out->f_flags & O_APPEND))
Christoph Hellwig04b38d62015-12-03 12:59:50 +01001678 return -EBADF;
1679
Christoph Hellwig0fcbf992016-02-26 18:53:12 +01001680 if (!file_in->f_op->clone_file_range)
1681 return -EOPNOTSUPP;
1682
Christoph Hellwig04b38d62015-12-03 12:59:50 +01001683 ret = clone_verify_area(file_in, pos_in, len, false);
1684 if (ret)
1685 return ret;
1686
1687 ret = clone_verify_area(file_out, pos_out, len, true);
1688 if (ret)
1689 return ret;
1690
1691 if (pos_in + len > i_size_read(inode_in))
1692 return -EINVAL;
1693
1694 ret = mnt_want_write_file(file_out);
1695 if (ret)
1696 return ret;
1697
1698 ret = file_in->f_op->clone_file_range(file_in, pos_in,
1699 file_out, pos_out, len);
1700 if (!ret) {
1701 fsnotify_access(file_in);
1702 fsnotify_modify(file_out);
1703 }
1704
1705 mnt_drop_write_file(file_out);
1706 return ret;
1707}
1708EXPORT_SYMBOL(vfs_clone_file_range);
Darrick J. Wong54dbc152015-12-19 00:55:59 -08001709
1710int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same)
1711{
1712 struct file_dedupe_range_info *info;
1713 struct inode *src = file_inode(file);
1714 u64 off;
1715 u64 len;
1716 int i;
1717 int ret;
1718 bool is_admin = capable(CAP_SYS_ADMIN);
1719 u16 count = same->dest_count;
1720 struct file *dst_file;
1721 loff_t dst_off;
1722 ssize_t deduped;
1723
1724 if (!(file->f_mode & FMODE_READ))
1725 return -EINVAL;
1726
1727 if (same->reserved1 || same->reserved2)
1728 return -EINVAL;
1729
1730 off = same->src_offset;
1731 len = same->src_length;
1732
1733 ret = -EISDIR;
1734 if (S_ISDIR(src->i_mode))
1735 goto out;
1736
1737 ret = -EINVAL;
1738 if (!S_ISREG(src->i_mode))
1739 goto out;
1740
1741 ret = clone_verify_area(file, off, len, false);
1742 if (ret < 0)
1743 goto out;
1744 ret = 0;
1745
1746 /* pre-format output fields to sane values */
1747 for (i = 0; i < count; i++) {
1748 same->info[i].bytes_deduped = 0ULL;
1749 same->info[i].status = FILE_DEDUPE_RANGE_SAME;
1750 }
1751
1752 for (i = 0, info = same->info; i < count; i++, info++) {
1753 struct inode *dst;
1754 struct fd dst_fd = fdget(info->dest_fd);
1755
1756 dst_file = dst_fd.file;
1757 if (!dst_file) {
1758 info->status = -EBADF;
1759 goto next_loop;
1760 }
1761 dst = file_inode(dst_file);
1762
1763 ret = mnt_want_write_file(dst_file);
1764 if (ret) {
1765 info->status = ret;
1766 goto next_loop;
1767 }
1768
1769 dst_off = info->dest_offset;
1770 ret = clone_verify_area(dst_file, dst_off, len, true);
1771 if (ret < 0) {
1772 info->status = ret;
1773 goto next_file;
1774 }
1775 ret = 0;
1776
1777 if (info->reserved) {
1778 info->status = -EINVAL;
1779 } else if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) {
1780 info->status = -EINVAL;
1781 } else if (file->f_path.mnt != dst_file->f_path.mnt) {
1782 info->status = -EXDEV;
1783 } else if (S_ISDIR(dst->i_mode)) {
1784 info->status = -EISDIR;
1785 } else if (dst_file->f_op->dedupe_file_range == NULL) {
1786 info->status = -EINVAL;
1787 } else {
1788 deduped = dst_file->f_op->dedupe_file_range(file, off,
1789 len, dst_file,
1790 info->dest_offset);
1791 if (deduped == -EBADE)
1792 info->status = FILE_DEDUPE_RANGE_DIFFERS;
1793 else if (deduped < 0)
1794 info->status = deduped;
1795 else
1796 info->bytes_deduped += deduped;
1797 }
1798
1799next_file:
1800 mnt_drop_write_file(dst_file);
1801next_loop:
1802 fdput(dst_fd);
Darrick J. Wonge62e5602016-01-22 16:58:28 -08001803
1804 if (fatal_signal_pending(current))
1805 goto out;
Darrick J. Wong54dbc152015-12-19 00:55:59 -08001806 }
1807
1808out:
1809 return ret;
1810}
1811EXPORT_SYMBOL(vfs_dedupe_file_range);