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/fsnotify.h>
13 #include <linux/security.h>
14 #include <linux/export.h>
15 #include <linux/syscalls.h>
16 #include <linux/pagemap.h>
17 #include <linux/splice.h>
18 #include <linux/compat.h>
19 #include "read_write.h"
22 #include <asm/uaccess.h>
23 #include <asm/unistd.h>
25 const struct file_operations generic_ro_fops = {
26 .llseek = generic_file_llseek,
28 .aio_read = generic_file_aio_read,
29 .mmap = generic_file_readonly_mmap,
30 .splice_read = generic_file_splice_read,
33 EXPORT_SYMBOL(generic_ro_fops);
35 static inline int unsigned_offsets(struct file *file)
37 return file->f_mode & FMODE_UNSIGNED_OFFSET;
40 static loff_t lseek_execute(struct file *file, struct inode *inode,
41 loff_t offset, loff_t maxsize)
43 if (offset < 0 && !unsigned_offsets(file))
48 if (offset != file->f_pos) {
56 * generic_file_llseek_size - generic llseek implementation for regular files
57 * @file: file structure to seek on
58 * @offset: file offset to seek to
59 * @whence: type of seek
60 * @size: max size of this file in file system
61 * @eof: offset used for SEEK_END position
63 * This is a variant of generic_file_llseek that allows passing in a custom
64 * maximum file size and a custom EOF position, for e.g. hashed directories
67 * SEEK_SET and SEEK_END are unsynchronized (but atomic on 64bit platforms)
68 * SEEK_CUR is synchronized against other SEEK_CURs, but not read/writes.
69 * read/writes behave like SEEK_SET against seeks.
72 generic_file_llseek_size(struct file *file, loff_t offset, int whence,
73 loff_t maxsize, loff_t eof)
75 struct inode *inode = file->f_mapping->host;
83 * Here we special-case the lseek(fd, 0, SEEK_CUR)
84 * position-querying operation. Avoid rewriting the "same"
85 * f_pos value back to the file because a concurrent read(),
86 * write() or lseek() might have altered it
91 * f_lock protects against read/modify/write race with other
92 * SEEK_CURs. Note that parallel writes and reads behave
95 spin_lock(&file->f_lock);
96 offset = lseek_execute(file, inode, file->f_pos + offset,
98 spin_unlock(&file->f_lock);
102 * In the generic case the entire file is data, so as long as
103 * offset isn't at the end of the file then the offset is data.
110 * There is a virtual hole at the end of the file, so as long as
111 * offset isn't i_size or larger, return i_size.
119 return lseek_execute(file, inode, offset, maxsize);
121 EXPORT_SYMBOL(generic_file_llseek_size);
124 * generic_file_llseek - generic llseek implementation for regular files
125 * @file: file structure to seek on
126 * @offset: file offset to seek to
127 * @whence: type of seek
129 * This is a generic implemenation of ->llseek useable for all normal local
130 * filesystems. It just updates the file offset to the value specified by
131 * @offset and @whence.
133 loff_t generic_file_llseek(struct file *file, loff_t offset, int whence)
135 struct inode *inode = file->f_mapping->host;
137 return generic_file_llseek_size(file, offset, whence,
138 inode->i_sb->s_maxbytes,
141 EXPORT_SYMBOL(generic_file_llseek);
144 * noop_llseek - No Operation Performed llseek implementation
145 * @file: file structure to seek on
146 * @offset: file offset to seek to
147 * @whence: type of seek
149 * This is an implementation of ->llseek useable for the rare special case when
150 * userspace expects the seek to succeed but the (device) file is actually not
151 * able to perform the seek. In this case you use noop_llseek() instead of
152 * falling back to the default implementation of ->llseek.
154 loff_t noop_llseek(struct file *file, loff_t offset, int whence)
158 EXPORT_SYMBOL(noop_llseek);
160 loff_t no_llseek(struct file *file, loff_t offset, int whence)
164 EXPORT_SYMBOL(no_llseek);
166 loff_t default_llseek(struct file *file, loff_t offset, int whence)
168 struct inode *inode = file_inode(file);
171 mutex_lock(&inode->i_mutex);
174 offset += i_size_read(inode);
178 retval = file->f_pos;
181 offset += file->f_pos;
185 * In the generic case the entire file is data, so as
186 * long as offset isn't at the end of the file then the
189 if (offset >= inode->i_size) {
196 * There is a virtual hole at the end of the file, so
197 * as long as offset isn't i_size or larger, return
200 if (offset >= inode->i_size) {
204 offset = inode->i_size;
208 if (offset >= 0 || unsigned_offsets(file)) {
209 if (offset != file->f_pos) {
210 file->f_pos = offset;
216 mutex_unlock(&inode->i_mutex);
219 EXPORT_SYMBOL(default_llseek);
221 loff_t vfs_llseek(struct file *file, loff_t offset, int whence)
223 loff_t (*fn)(struct file *, loff_t, int);
226 if (file->f_mode & FMODE_LSEEK) {
227 if (file->f_op && file->f_op->llseek)
228 fn = file->f_op->llseek;
230 return fn(file, offset, whence);
232 EXPORT_SYMBOL(vfs_llseek);
234 SYSCALL_DEFINE3(lseek, unsigned int, fd, off_t, offset, unsigned int, whence)
237 struct fd f = fdget(fd);
242 if (whence <= SEEK_MAX) {
243 loff_t res = vfs_llseek(f.file, offset, whence);
245 if (res != (loff_t)retval)
246 retval = -EOVERFLOW; /* LFS: should only happen on 32 bit platforms */
253 COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset, unsigned int, whence)
255 return sys_lseek(fd, offset, whence);
259 #ifdef __ARCH_WANT_SYS_LLSEEK
260 SYSCALL_DEFINE5(llseek, unsigned int, fd, unsigned long, offset_high,
261 unsigned long, offset_low, loff_t __user *, result,
262 unsigned int, whence)
265 struct fd f = fdget(fd);
272 if (whence > SEEK_MAX)
275 offset = vfs_llseek(f.file, ((loff_t) offset_high << 32) | offset_low,
278 retval = (int)offset;
281 if (!copy_to_user(result, &offset, sizeof(offset)))
291 * rw_verify_area doesn't like huge counts. We limit
292 * them to something that fits in "int" so that others
293 * won't have to do range checks all the time.
295 int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count)
299 int retval = -EINVAL;
301 inode = file_inode(file);
302 if (unlikely((ssize_t) count < 0))
305 if (unlikely(pos < 0)) {
306 if (!unsigned_offsets(file))
308 if (count >= -pos) /* both values are in 0..LLONG_MAX */
310 } else if (unlikely((loff_t) (pos + count) < 0)) {
311 if (!unsigned_offsets(file))
315 if (unlikely(inode->i_flock && mandatory_lock(inode))) {
316 retval = locks_mandatory_area(
317 read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE,
318 inode, file, pos, count);
322 retval = security_file_permission(file,
323 read_write == READ ? MAY_READ : MAY_WRITE);
326 return count > MAX_RW_COUNT ? MAX_RW_COUNT : count;
329 static void wait_on_retry_sync_kiocb(struct kiocb *iocb)
331 set_current_state(TASK_UNINTERRUPTIBLE);
332 if (!kiocbIsKicked(iocb))
335 kiocbClearKicked(iocb);
336 __set_current_state(TASK_RUNNING);
339 ssize_t do_sync_read(struct file *filp, char __user *buf, size_t len, loff_t *ppos)
341 struct iovec iov = { .iov_base = buf, .iov_len = len };
345 init_sync_kiocb(&kiocb, filp);
346 kiocb.ki_pos = *ppos;
348 kiocb.ki_nbytes = len;
351 ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);
352 if (ret != -EIOCBRETRY)
354 wait_on_retry_sync_kiocb(&kiocb);
357 if (-EIOCBQUEUED == ret)
358 ret = wait_on_sync_kiocb(&kiocb);
359 *ppos = kiocb.ki_pos;
363 EXPORT_SYMBOL(do_sync_read);
365 ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
369 if (!(file->f_mode & FMODE_READ))
371 if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read))
373 if (unlikely(!access_ok(VERIFY_WRITE, buf, count)))
376 ret = rw_verify_area(READ, file, pos, count);
379 if (file->f_op->read)
380 ret = file->f_op->read(file, buf, count, pos);
382 ret = do_sync_read(file, buf, count, pos);
384 fsnotify_access(file);
385 add_rchar(current, ret);
393 EXPORT_SYMBOL(vfs_read);
395 ssize_t do_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos)
397 struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = len };
401 init_sync_kiocb(&kiocb, filp);
402 kiocb.ki_pos = *ppos;
404 kiocb.ki_nbytes = len;
407 ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);
408 if (ret != -EIOCBRETRY)
410 wait_on_retry_sync_kiocb(&kiocb);
413 if (-EIOCBQUEUED == ret)
414 ret = wait_on_sync_kiocb(&kiocb);
415 *ppos = kiocb.ki_pos;
419 EXPORT_SYMBOL(do_sync_write);
421 ssize_t __kernel_write(struct file *file, const char *buf, size_t count, loff_t *pos)
424 const char __user *p;
427 if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
432 p = (__force const char __user *)buf;
433 if (count > MAX_RW_COUNT)
434 count = MAX_RW_COUNT;
435 if (file->f_op->write)
436 ret = file->f_op->write(file, p, count, pos);
438 ret = do_sync_write(file, p, count, pos);
441 fsnotify_modify(file);
442 add_wchar(current, ret);
448 ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
452 if (!(file->f_mode & FMODE_WRITE))
454 if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))
456 if (unlikely(!access_ok(VERIFY_READ, buf, count)))
459 ret = rw_verify_area(WRITE, file, pos, count);
462 file_start_write(file);
463 if (file->f_op->write)
464 ret = file->f_op->write(file, buf, count, pos);
466 ret = do_sync_write(file, buf, count, pos);
468 fsnotify_modify(file);
469 add_wchar(current, ret);
472 file_end_write(file);
478 EXPORT_SYMBOL(vfs_write);
480 static inline loff_t file_pos_read(struct file *file)
485 static inline void file_pos_write(struct file *file, loff_t pos)
490 SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)
492 struct fd f = fdget(fd);
493 ssize_t ret = -EBADF;
496 loff_t pos = file_pos_read(f.file);
497 ret = vfs_read(f.file, buf, count, &pos);
498 file_pos_write(f.file, pos);
504 SYSCALL_DEFINE3(write, unsigned int, fd, const char __user *, buf,
507 struct fd f = fdget(fd);
508 ssize_t ret = -EBADF;
511 loff_t pos = file_pos_read(f.file);
512 ret = vfs_write(f.file, buf, count, &pos);
513 file_pos_write(f.file, pos);
520 SYSCALL_DEFINE4(pread64, unsigned int, fd, char __user *, buf,
521 size_t, count, loff_t, pos)
524 ssize_t ret = -EBADF;
532 if (f.file->f_mode & FMODE_PREAD)
533 ret = vfs_read(f.file, buf, count, &pos);
540 SYSCALL_DEFINE4(pwrite64, unsigned int, fd, const char __user *, buf,
541 size_t, count, loff_t, pos)
544 ssize_t ret = -EBADF;
552 if (f.file->f_mode & FMODE_PWRITE)
553 ret = vfs_write(f.file, buf, count, &pos);
561 * Reduce an iovec's length in-place. Return the resulting number of segments
563 unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to)
565 unsigned long seg = 0;
568 while (seg < nr_segs) {
570 if (len + iov->iov_len >= to) {
571 iov->iov_len = to - len;
579 EXPORT_SYMBOL(iov_shorten);
581 static ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov,
582 unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn)
587 init_sync_kiocb(&kiocb, filp);
588 kiocb.ki_pos = *ppos;
590 kiocb.ki_nbytes = len;
593 ret = fn(&kiocb, iov, nr_segs, kiocb.ki_pos);
594 if (ret != -EIOCBRETRY)
596 wait_on_retry_sync_kiocb(&kiocb);
599 if (ret == -EIOCBQUEUED)
600 ret = wait_on_sync_kiocb(&kiocb);
601 *ppos = kiocb.ki_pos;
605 /* Do it by hand, with file-ops */
606 static ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov,
607 unsigned long nr_segs, loff_t *ppos, io_fn_t fn)
609 struct iovec *vector = iov;
612 while (nr_segs > 0) {
617 base = vector->iov_base;
618 len = vector->iov_len;
622 nr = fn(filp, base, len, ppos);
637 /* A write operation does a read from user space and vice versa */
638 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
640 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
641 unsigned long nr_segs, unsigned long fast_segs,
642 struct iovec *fast_pointer,
643 struct iovec **ret_pointer)
647 struct iovec *iov = fast_pointer;
650 * SuS says "The readv() function *may* fail if the iovcnt argument
651 * was less than or equal to 0, or greater than {IOV_MAX}. Linux has
652 * traditionally returned zero for zero segments, so...
660 * First get the "struct iovec" from user memory and
661 * verify all the pointers
663 if (nr_segs > UIO_MAXIOV) {
667 if (nr_segs > fast_segs) {
668 iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
674 if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) {
680 * According to the Single Unix Specification we should return EINVAL
681 * if an element length is < 0 when cast to ssize_t or if the
682 * total length would overflow the ssize_t return value of the
685 * Linux caps all read/write calls to MAX_RW_COUNT, and avoids the
689 for (seg = 0; seg < nr_segs; seg++) {
690 void __user *buf = iov[seg].iov_base;
691 ssize_t len = (ssize_t)iov[seg].iov_len;
693 /* see if we we're about to use an invalid len or if
694 * it's about to overflow ssize_t */
700 && unlikely(!access_ok(vrfy_dir(type), buf, len))) {
704 if (len > MAX_RW_COUNT - ret) {
705 len = MAX_RW_COUNT - ret;
706 iov[seg].iov_len = len;
715 static ssize_t do_readv_writev(int type, struct file *file,
716 const struct iovec __user * uvector,
717 unsigned long nr_segs, loff_t *pos)
720 struct iovec iovstack[UIO_FASTIOV];
721 struct iovec *iov = iovstack;
731 ret = rw_copy_check_uvector(type, uvector, nr_segs,
732 ARRAY_SIZE(iovstack), iovstack, &iov);
737 ret = rw_verify_area(type, file, pos, tot_len);
743 fn = file->f_op->read;
744 fnv = file->f_op->aio_read;
746 fn = (io_fn_t)file->f_op->write;
747 fnv = file->f_op->aio_write;
748 file_start_write(file);
752 ret = do_sync_readv_writev(file, iov, nr_segs, tot_len,
755 ret = do_loop_readv_writev(file, iov, nr_segs, pos, fn);
758 file_end_write(file);
763 if ((ret + (type == READ)) > 0) {
765 fsnotify_access(file);
767 fsnotify_modify(file);
772 ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
773 unsigned long vlen, loff_t *pos)
775 if (!(file->f_mode & FMODE_READ))
777 if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))
780 return do_readv_writev(READ, file, vec, vlen, pos);
783 EXPORT_SYMBOL(vfs_readv);
785 ssize_t vfs_writev(struct file *file, const struct iovec __user *vec,
786 unsigned long vlen, loff_t *pos)
788 if (!(file->f_mode & FMODE_WRITE))
790 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
793 return do_readv_writev(WRITE, file, vec, vlen, pos);
796 EXPORT_SYMBOL(vfs_writev);
798 SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, vec,
801 struct fd f = fdget(fd);
802 ssize_t ret = -EBADF;
805 loff_t pos = file_pos_read(f.file);
806 ret = vfs_readv(f.file, vec, vlen, &pos);
807 file_pos_write(f.file, pos);
812 add_rchar(current, ret);
817 SYSCALL_DEFINE3(writev, unsigned long, fd, const struct iovec __user *, vec,
820 struct fd f = fdget(fd);
821 ssize_t ret = -EBADF;
824 loff_t pos = file_pos_read(f.file);
825 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);
991 COMPAT_SYSCALL_DEFINE4(preadv64, unsigned long, fd,
992 const struct compat_iovec __user *,vec,
993 unsigned long, vlen, loff_t, pos)
1004 if (f.file->f_mode & FMODE_PREAD)
1005 ret = compat_readv(f.file, vec, vlen, &pos);
1010 COMPAT_SYSCALL_DEFINE5(preadv, unsigned long, fd,
1011 const struct compat_iovec __user *,vec,
1012 unsigned long, vlen, u32, pos_low, u32, pos_high)
1014 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1015 return compat_sys_preadv64(fd, vec, vlen, pos);
1018 static size_t compat_writev(struct file *file,
1019 const struct compat_iovec __user *vec,
1020 unsigned long vlen, loff_t *pos)
1022 ssize_t ret = -EBADF;
1024 if (!(file->f_mode & FMODE_WRITE))
1028 if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))
1031 ret = compat_do_readv_writev(WRITE, file, vec, vlen, pos);
1035 add_wchar(current, ret);
1040 COMPAT_SYSCALL_DEFINE3(writev, unsigned long, fd,
1041 const struct compat_iovec __user *, vec,
1042 unsigned long, vlen)
1044 struct fd f = fdget(fd);
1050 pos = f.file->f_pos;
1051 ret = compat_writev(f.file, vec, vlen, &pos);
1052 f.file->f_pos = pos;
1057 COMPAT_SYSCALL_DEFINE4(pwritev64, unsigned long, fd,
1058 const struct compat_iovec __user *,vec,
1059 unsigned long, vlen, loff_t, pos)
1070 if (f.file->f_mode & FMODE_PWRITE)
1071 ret = compat_writev(f.file, vec, vlen, &pos);
1076 COMPAT_SYSCALL_DEFINE5(pwritev, unsigned long, fd,
1077 const struct compat_iovec __user *,vec,
1078 unsigned long, vlen, u32, pos_low, u32, pos_high)
1080 loff_t pos = ((loff_t)pos_high << 32) | pos_low;
1081 return compat_sys_pwritev64(fd, vec, vlen, pos);
1085 static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
1086 size_t count, loff_t max)
1089 struct inode *in_inode, *out_inode;
1095 * Get input file, and verify that it is ok..
1101 if (!(in.file->f_mode & FMODE_READ))
1105 ppos = &in.file->f_pos;
1107 if (!(in.file->f_mode & FMODE_PREAD))
1109 retval = rw_verify_area(READ, in.file, ppos, count);
1115 * Get output file, and verify that it is ok..
1118 out = fdget(out_fd);
1121 if (!(out.file->f_mode & FMODE_WRITE))
1124 in_inode = file_inode(in.file);
1125 out_inode = file_inode(out.file);
1126 retval = rw_verify_area(WRITE, out.file, &out.file->f_pos, count);
1132 max = min(in_inode->i_sb->s_maxbytes, out_inode->i_sb->s_maxbytes);
1135 if (unlikely(pos + count > max)) {
1136 retval = -EOVERFLOW;
1145 * We need to debate whether we can enable this or not. The
1146 * man page documents EAGAIN return for the output at least,
1147 * and the application is arguably buggy if it doesn't expect
1148 * EAGAIN on a non-blocking file descriptor.
1150 if (in.file->f_flags & O_NONBLOCK)
1151 fl = SPLICE_F_NONBLOCK;
1153 retval = do_splice_direct(in.file, ppos, out.file, count, fl);
1156 add_rchar(current, retval);
1157 add_wchar(current, retval);
1158 fsnotify_access(in.file);
1159 fsnotify_modify(out.file);
1165 retval = -EOVERFLOW;
1175 SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd, off_t __user *, offset, size_t, count)
1182 if (unlikely(get_user(off, offset)))
1185 ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
1186 if (unlikely(put_user(pos, offset)))
1191 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1194 SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd, loff_t __user *, offset, size_t, count)
1200 if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
1202 ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
1203 if (unlikely(put_user(pos, offset)))
1208 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1211 #ifdef CONFIG_COMPAT
1212 COMPAT_SYSCALL_DEFINE4(sendfile, int, out_fd, int, in_fd,
1213 compat_off_t __user *, offset, compat_size_t, count)
1220 if (unlikely(get_user(off, offset)))
1223 ret = do_sendfile(out_fd, in_fd, &pos, count, MAX_NON_LFS);
1224 if (unlikely(put_user(pos, offset)))
1229 return do_sendfile(out_fd, in_fd, NULL, count, 0);
1232 COMPAT_SYSCALL_DEFINE4(sendfile64, int, out_fd, int, in_fd,
1233 compat_loff_t __user *, offset, compat_size_t, count)
1239 if (unlikely(copy_from_user(&pos, offset, sizeof(loff_t))))
1241 ret = do_sendfile(out_fd, in_fd, &pos, count, 0);
1242 if (unlikely(put_user(pos, offset)))
1247 return do_sendfile(out_fd, in_fd, NULL, count, 0);