2 * linux/fs/read_write.c
4 * Copyright (C) 1991, 1992 Linus Torvalds
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>
22 #include <asm/uaccess.h>
23 #include <asm/unistd.h>
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);
29 const struct file_operations generic_ro_fops = {
30 .llseek = generic_file_llseek,
32 .aio_read = generic_file_aio_read,
33 .mmap = generic_file_readonly_mmap,
34 .splice_read = generic_file_splice_read,
37 EXPORT_SYMBOL(generic_ro_fops);
39 static inline int unsigned_offsets(struct file *file)
41 return file->f_mode & FMODE_UNSIGNED_OFFSET;
44 static loff_t lseek_execute(struct file *file, struct inode *inode,
45 loff_t offset, loff_t maxsize)
47 if (offset < 0 && !unsigned_offsets(file))
52 if (offset != file->f_pos) {
60 * generic_file_llseek_size - generic llseek implementation for regular files
61 * @file: file structure to seek on
62 * @offset: file offset to seek to
63 * @whence: type of seek
64 * @size: max size of this file in file system
65 * @eof: offset used for SEEK_END position
67 * This is a variant of generic_file_llseek that allows passing in a custom
68 * maximum file size and a custom EOF position, for e.g. hashed directories
71 * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms)
72 * SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes.
73 * read/writes behave like SEEK_SET against seeks.
76 generic_file_llseek_size(struct file *file, loff_t offset, int whence,
77 loff_t maxsize, loff_t eof)
79 struct inode *inode = file->f_mapping->host;
87 * Here we special-case the lseek(fd, 0, SEEK_CUR)
88 * position-querying operation. Avoid rewriting the "same"
89 * f_pos value back to the file because a concurrent read(),
90 * write() or lseek() might have altered it
95 * f_lock protects against read/modify/write race with other
96 * SEEK_CURs. Note that parallel writes and reads behave
99 spin_lock(&file->f_lock);
100 offset = lseek_execute(file, inode, file->f_pos + offset,
102 spin_unlock(&file->f_lock);
106 * In the generic case the entire file is data, so as long as
107 * offset isn't at the end of the file then the offset is data.
114 * There is a virtual hole at the end of the file, so as long as
115 * offset isn't i_size or larger, return i_size.
123 return lseek_execute(file, inode, offset, maxsize);
125 EXPORT_SYMBOL(generic_file_llseek_size);
128 * generic_file_llseek - generic llseek implementation for regular files
129 * @file: file structure to seek on
130 * @offset: file offset to seek to
131 * @whence: type of seek
133 * This is a generic implemenation of ->llseek useable for all normal local
134 * filesystems. It just updates the file offset to the value specified by
135 * @offset and @whence.
137 loff_t generic_file_llseek(struct file *file, loff_t offset, int whence)
139 struct inode *inode = file->f_mapping->host;
141 return generic_file_llseek_size(file, offset, whence,
142 inode->i_sb->s_maxbytes,
145 EXPORT_SYMBOL(generic_file_llseek);
148 * fixed_size_llseek - llseek implementation for fixed-sized devices
149 * @file: file structure to seek on
150 * @offset: file offset to seek to
151 * @whence: type of seek
152 * @size: size of the file
155 loff_t fixed_size_llseek(struct file *file, loff_t offset, int whence, loff_t size)
158 case SEEK_SET: case SEEK_CUR: case SEEK_END:
159 return generic_file_llseek_size(file, offset, whence,
165 EXPORT_SYMBOL(fixed_size_llseek);
168 * noop_llseek - No Operation Performed llseek implementation
169 * @file: file structure to seek on
170 * @offset: file offset to seek to
171 * @whence: type of seek
173 * This is an implementation of ->llseek useable for the rare special case when
174 * userspace expects the seek to succeed but the (device) file is actually not
175 * able to perform the seek. In this case you use noop_llseek() instead of
176 * falling back to the default implementation of ->llseek.
178 loff_t noop_llseek(struct file *file, loff_t offset, int whence)
182 EXPORT_SYMBOL(noop_llseek);
184 loff_t no_llseek(struct file *file, loff_t offset, int whence)
188 EXPORT_SYMBOL(no_llseek);
190 loff_t default_llseek(struct file *file, loff_t offset, int whence)
192 struct inode *inode = file_inode(file);
195 mutex_lock(&inode->i_mutex);
198 offset += i_size_read(inode);
202 retval = file->f_pos;
205 offset += file->f_pos;
209 * In the generic case the entire file is data, so as
210 * long as offset isn't at the end of the file then the
213 if (offset >= inode->i_size) {
220 * There is a virtual hole at the end of the file, so
221 * as long as offset isn't i_size or larger, return
224 if (offset >= inode->i_size) {
228 offset = inode->i_size;
232 if (offset >= 0 || unsigned_offsets(file)) {
233 if (offset != file->f_pos) {
234 file->f_pos = offset;
240 mutex_unlock(&inode->i_mutex);
243 EXPORT_SYMBOL(default_llseek);
245 loff_t vfs_llseek(struct file *file, loff_t offset, int whence)
247 loff_t (*fn)(struct file *, loff_t, int);
250 if (file->f_mode & FMODE_LSEEK) {
251 if (file->f_op && file->f_op->llseek)
252 fn = file->f_op->llseek;
254 return fn(file, offset, whence);
256 EXPORT_SYMBOL(vfs_llseek);
258 SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
261 struct fd f = fdget(fd);
266 if (whence <= SEEK_MAX) {
267 loff_t res = vfs_llseek(f.file, offset, whence);
269 if (res != (loff_t)retval)
270 retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */
277 COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence)
279 return sys_lseek(fd, offset, whence);
283 #ifdef __ARCH_WANT_SYS_LLSEEK
284 SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
285 unsigned long, offset_low, loff_t __user *, result,
286 unsigned int, whence)
289 struct fd f = fdget(fd);
296 if (whence > SEEK_MAX)
299 offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low,
302 retval = (int)offset;
305 if (!copy_to_user(result, &offset, sizeof(offset)))
315 * rw_verify_area doesn't like huge counts. We limit
316 * them to something that fits in "int" so that others
317 * won't have to do range checks all the time.
319 int rw_verify_area(int read_write, struct file *file, const loff_t *ppos, size_t count)
323 int retval = -EINVAL;
325 inode = file_inode(file);
326 if (unlikely((ssize_t) count < 0))
329 if (unlikely(pos < 0)) {
330 if (!unsigned_offsets(file))
332 if (count >= -pos) /* both values are in 0..LLONG_MAX */
334 } else if (unlikely((loff_t) (pos + count) < 0)) {
335 if (!unsigned_offsets(file))
339 if (unlikely(inode->i_flock && mandatory_lock(inode))) {
340 retval = locks_mandatory_area(
341 read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE,
342 inode, file, pos, count);
346 retval = security_file_permission(file,
347 read_write == READ ? MAY_READ : MAY_WRITE);
350 return count > MAX_RW_COUNT ? MAX_RW_COUNT : count;
353 ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
355 struct iovec iov = { .iov_base = buf, .iov_len = len };
359 init_sync_kiocb(&kiocb, filp);
360 kiocb.ki_pos = *ppos;
362 kiocb.ki_nbytes = len;
364 ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
365 if (-EIOCBQUEUED == ret)
366 ret = wait_on_sync_kiocb(&kiocb);
367 *ppos = kiocb.ki_pos;
371 EXPORT_SYMBOL(do_sync_read);
373 ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
377 if (!(file->f_mode & FMODE_READ))
379 if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read))
381 if (unlikely(!access_ok(VERIFY_WRITE, buf, count)))
384 ret = rw_verify_area(READ, file, pos, count);
387 if (file->f_op->read)
388 ret = file->f_op->read(file, buf, count, pos);
390 ret = do_sync_read(file, buf, count, pos);
392 fsnotify_access(file);
393 add_rchar(current, ret);
401 EXPORT_SYMBOL(vfs_read);
403 ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
405 struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
409 init_sync_kiocb(&kiocb, filp);
410 kiocb.ki_pos = *ppos;
412 kiocb.ki_nbytes = len;
414 ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
415 if (-EIOCBQUEUED == ret)
416 ret = wait_on_sync_kiocb(&kiocb);
417 *ppos = kiocb.ki_pos;
421 EXPORT_SYMBOL(do_sync_write);
423 ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
426 const char __user *p;
429 if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
434 p = (__force const char __user *)buf;
435 if (count > MAX_RW_COUNT)
436 count = MAX_RW_COUNT;
437 if (file->f_op->write)
438 ret = file->f_op->write(file, p, count, pos);
440 ret = do_sync_write(file, p, count, pos);
443 fsnotify_modify(file);
444 add_wchar(current, ret);
450 ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
454 if (!(file->f_mode & FMODE_WRITE))
456 if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
458 if (unlikely(!access_ok(VERIFY_READ, buf, count)))
461 ret = rw_verify_area(WRITE, file, pos, count);
464 file_start_write(file);
465 if (file->f_op->write)
466 ret = file->f_op->write(file, buf, count, pos);
468 ret = do_sync_write(file, buf, count, pos);
470 fsnotify_modify(file);
471 add_wchar(current, ret);
474 file_end_write(file);
480 EXPORT_SYMBOL(vfs_write);
482 static inline loff_t file_pos_read(struct file *file)
487 static inline void file_pos_write(struct file *file, loff_t pos)
492 SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
494 struct fd f = fdget(fd);
495 ssize_t ret = -EBADF;
498 loff_t pos = file_pos_read(f.file);
499 ret = vfs_read(f.file, buf, count, &pos);
501 file_pos_write(f.file, pos);
507 SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
510 struct fd f = fdget(fd);
511 ssize_t ret = -EBADF;
514 loff_t pos = file_pos_read(f.file);
515 ret = vfs_write(f.file, buf, count, &pos);
517 file_pos_write(f.file, pos);
524 SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf,
525 size_t, count, loff_t, pos)
528 ssize_t ret = -EBADF;
536 if (f.file->f_mode & FMODE_PREAD)
537 ret = vfs_read(f.file, buf, count, &pos);
544 SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf,
545 size_t, count, loff_t, pos)
548 ssize_t ret = -EBADF;
556 if (f.file->f_mode & FMODE_PWRITE)
557 ret = vfs_write(f.file, buf, count, &pos);
565 * Reduce an iovec's length in-place. Return the resulting number of segments
567 unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to)
569 unsigned long seg = 0;
572 while (seg < nr_segs) {
574 if (len + iov->iov_len >= to) {
575 iov->iov_len = to - len;
583 EXPORT_SYMBOL(iov_shorten);
585 static ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov,
586 unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn)
591 init_sync_kiocb(&kiocb, filp);
592 kiocb.ki_pos = *ppos;
594 kiocb.ki_nbytes = len;
596 ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos);
597 if (ret == -EIOCBQUEUED)
598 ret = wait_on_sync_kiocb(&kiocb);
599 *ppos = kiocb.ki_pos;
603 /* Do it by hand, with file-ops */
604 static ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov,
605 unsigned long nr_segs, loff_t *ppos, io_fn_t fn)
607 struct iovec *vector = iov;
610 while (nr_segs > 0) {
615 base = vector->iov_base;
616 len = vector->iov_len;
620 nr = fn(filp, base, len, ppos);
635 /* A write operation does a read from user space and vice versa */
636 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
638 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
639 unsigned long nr_segs, unsigned long fast_segs,
640 struct iovec *fast_pointer,
641 struct iovec **ret_pointer)
645 struct iovec *iov = fast_pointer;
648 * SuS says "The readv() function *may* fail if the iovcnt argument
649 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
650 * traditionally returned zero for zero segments, so...
658 * First get the "struct iovec" from user memory and
659 * verify all the pointers
661 if (nr_segs > UIO_MAXIOV) {
665 if (nr_segs > fast_segs) {
666 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
672 if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) {
678 * According to the Single Unix Specification we should return EINVAL
679 * if an element length is < 0 when cast to ssize_t or if the
680 * total length would overflow the ssize_t return value of the
683 * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the
687 for (seg = 0; seg < nr_segs; seg++) {
688 void __user *buf = iov[seg].iov_base;
689 ssize_t len = (ssize_t)iov[seg].iov_len;
691 /* see if we we're about to use an invalid len or if
692 * it's about to overflow ssize_t */
698 && unlikely(!access_ok(vrfy_dir(type), buf, len))) {
702 if (len > MAX_RW_COUNT - ret) {
703 len = MAX_RW_COUNT - ret;
704 iov[seg].iov_len = len;
713 static ssize_t do_readv_writev(int type, struct file *file,
714 const struct iovec __user * uvector,
715 unsigned long nr_segs, loff_t *pos)
718 struct iovec iovstack[UIO_FASTIOV];
719 struct iovec *iov = iovstack;
729 ret = rw_copy_check_uvector(type, uvector, nr_segs,
730 ARRAY_SIZE(iovstack), iovstack, &iov);
735 ret = rw_verify_area(type, file, pos, tot_len);
741 fn = file->f_op->read;
742 fnv = file->f_op->aio_read;
744 fn = (io_fn_t)file->f_op->write;
745 fnv = file->f_op->aio_write;
746 file_start_write(file);
750 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
753 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
756 file_end_write(file);
761 if ((ret + (type == READ)) > 0) {
763 fsnotify_access(file);
765 fsnotify_modify(file);
770 ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
771 unsigned long vlen, loff_t *pos)
773 if (!(file->f_mode & FMODE_READ))
775 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
778 return do_readv_writev(READ, file, vec, vlen, pos);
781 EXPORT_SYMBOL(vfs_readv);
783 ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
784 unsigned long vlen, loff_t *pos)
786 if (!(file->f_mode & FMODE_WRITE))
788 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
791 return do_readv_writev(WRITE, file, vec, vlen, pos);
794 EXPORT_SYMBOL(vfs_writev);
796 SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
799 struct fd f = fdget(fd);
800 ssize_t ret = -EBADF;
803 loff_t pos = file_pos_read(f.file);
804 ret = vfs_readv(f.file, vec, vlen, &pos);
806 file_pos_write(f.file, pos);
811 add_rchar(current, ret);
816 SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
819 struct fd f = fdget(fd);
820 ssize_t ret = -EBADF;
823 loff_t pos = file_pos_read(f.file);
824 ret = vfs_writev(f.file, vec, vlen, &pos);
826 file_pos_write(f.file, pos);
831 add_wchar(current, ret);
836 static inline loff_t pos_from_hilo(unsigned long high, unsigned long low)
838 #define HALF_LONG_BITS (BITS_PER_LONG / 2)
839 return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low;
842 SYSCALL_DEFINE5(preadv, unsigned long, fd, const struct iovec __user *, vec,
843 unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h)
845 loff_t pos = pos_from_hilo(pos_h, pos_l);
847 ssize_t ret = -EBADF;
855 if (f.file->f_mode & FMODE_PREAD)
856 ret = vfs_readv(f.file, vec, vlen, &pos);
861 add_rchar(current, ret);
866 SYSCALL_DEFINE5(pwritev, unsigned long, fd, const struct iovec __user *, vec,
867 unsigned long, vlen, unsigned long, pos_l, unsigned long, pos_h)
869 loff_t pos = pos_from_hilo(pos_h, pos_l);
871 ssize_t ret = -EBADF;
879 if (f.file->f_mode & FMODE_PWRITE)
880 ret = vfs_writev(f.file, vec, vlen, &pos);
885 add_wchar(current, ret);
892 static ssize_t compat_do_readv_writev(int type, struct file *file,
893 const struct compat_iovec __user *uvector,
894 unsigned long nr_segs, loff_t *pos)
896 compat_ssize_t tot_len;
897 struct iovec iovstack[UIO_FASTIOV];
898 struct iovec *iov = iovstack;
908 if (!access_ok(VERIFY_READ, uvector, nr_segs*sizeof(*uvector)))
911 ret = compat_rw_copy_check_uvector(type, uvector, nr_segs,
912 UIO_FASTIOV, iovstack, &iov);
917 ret = rw_verify_area(type, file, pos, tot_len);
923 fn = file->f_op->read;
924 fnv = file->f_op->aio_read;
926 fn = (io_fn_t)file->f_op->write;
927 fnv = file->f_op->aio_write;
928 file_start_write(file);
932 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
935 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
938 file_end_write(file);
943 if ((ret + (type == READ)) > 0) {
945 fsnotify_access(file);
947 fsnotify_modify(file);
952 static size_t compat_readv(struct file *file,
953 const struct compat_iovec __user *vec,
954 unsigned long vlen, loff_t *pos)
956 ssize_t ret = -EBADF;
958 if (!(file->f_mode & FMODE_READ))
962 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
965 ret = compat_do_readv_writev(READ, file, vec, vlen, pos);
969 add_rchar(current, ret);
974 COMPAT_SYSCALL_DEFINE3(readv, unsigned long, fd,
975 const struct compat_iovec __user *,vec,
978 struct fd f = fdget(fd);
985 ret = compat_readv(f.file, vec, vlen, &pos);
992 COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
993 const struct compat_iovec __user *,vec,
994 unsigned long, vlen, loff_t, pos)
1005 if (f.file->f_mode & FMODE_PREAD)
1006 ret = compat_readv(f.file, vec, vlen, &pos);
1011 COMPAT_SYSCALL_DEFINE5(preadv, unsigned long, fd,
1012 const struct compat_iovec __user *,vec,
1013 unsigned long, vlen, u32, pos_low, u32, pos_high)
1015 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1016 return compat_sys_preadv64(fd, vec, vlen, pos);
1019 static size_t compat_writev(struct file *file,
1020 const struct compat_iovec __user *vec,
1021 unsigned long vlen, loff_t *pos)
1023 ssize_t ret = -EBADF;
1025 if (!(file->f_mode & FMODE_WRITE))
1029 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1032 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1036 add_wchar(current, ret);
1041 COMPAT_SYSCALL_DEFINE3(writev, unsigned long, fd,
1042 const struct compat_iovec __user *, vec,
1043 unsigned long, vlen)
1045 struct fd f = fdget(fd);
1051 pos = f.file->f_pos;
1052 ret = compat_writev(f.file, vec, vlen, &pos);
1054 f.file->f_pos = pos;
1059 COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
1060 const struct compat_iovec __user *,vec,
1061 unsigned long, vlen, loff_t, pos)
1072 if (f.file->f_mode & FMODE_PWRITE)
1073 ret = compat_writev(f.file, vec, vlen, &pos);
1078 COMPAT_SYSCALL_DEFINE5(pwritev, unsigned long, fd,
1079 const struct compat_iovec __user *,vec,
1080 unsigned long, vlen, u32, pos_low, u32, pos_high)
1082 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1083 return compat_sys_pwritev64(fd, vec, vlen, pos);
1087 static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
1088 size_t count, loff_t max)
1091 struct inode *in_inode, *out_inode;
1098 * Get input file, and verify that it is ok..
1104 if (!(in.file->f_mode & FMODE_READ))
1108 pos = in.file->f_pos;
1111 if (!(in.file->f_mode & FMODE_PREAD))
1114 retval = rw_verify_area(READ, in.file, &pos, count);
1120 * Get output file, and verify that it is ok..
1123 out = fdget(out_fd);
1126 if (!(out.file->f_mode & FMODE_WRITE))
1129 in_inode = file_inode(in.file);
1130 out_inode = file_inode(out.file);
1131 out_pos = out.file->f_pos;
1132 retval = rw_verify_area(WRITE, out.file, &out_pos, count);
1138 max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);
1140 if (unlikely(pos + count > max)) {
1141 retval = -EOVERFLOW;
1150 * We need to debate whether we can enable this or not. The
1151 * man page documents EAGAIN return for the output at least,
1152 * and the application is arguably buggy if it doesn't expect
1153 * EAGAIN on a non-blocking file descriptor.
1155 if (in.file->f_flags & O_NONBLOCK)
1156 fl = SPLICE_F_NONBLOCK;
1158 file_start_write(out.file);
1159 retval = do_splice_direct(in.file, &pos, out.file, &out_pos, count, fl);
1160 file_end_write(out.file);
1163 add_rchar(current, retval);
1164 add_wchar(current, retval);
1165 fsnotify_access(in.file);
1166 fsnotify_modify(out.file);
1167 out.file->f_pos = out_pos;
1171 in.file->f_pos = pos;
1177 retval = -EOVERFLOW;
1187 SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_t, count)
1194 if (unlikely(get_user(off, offset)))
1197 ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
1198 if (unlikely(put_user(pos, offset)))
1203 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1206 SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count)
1212 if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
1214 ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
1215 if (unlikely(put_user(pos, offset)))
1220 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1223 #ifdef CONFIG_COMPAT
1224 COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd,
1225 compat_off_t __user *, offset, compat_size_t, count)
1232 if (unlikely(get_user(off, offset)))
1235 ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
1236 if (unlikely(put_user(pos, offset)))
1241 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1244 COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd,
1245 compat_loff_t __user *, offset, compat_size_t, count)
1251 if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
1253 ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
1254 if (unlikely(put_user(pos, offset)))
1259 return do_sendfile(out_fd, in_fd, NULL, count, 0);