1 #include <linux/uaccess.h>
2 #include <linux/export.h>
6 * Copy iovec to kernel. Returns -EFAULT on error.
8 * Note: this modifies the original iovec.
11 int memcpy_fromiovec(unsigned char *kdata
, struct iovec
*iov
, int len
)
15 int copy
= min_t(unsigned int, len
, iov
->iov_len
);
16 if (copy_from_user(kdata
, iov
->iov_base
, copy
))
20 iov
->iov_base
+= copy
;
28 EXPORT_SYMBOL(memcpy_fromiovec
);
31 * Copy kernel to iovec. Returns -EFAULT on error.
33 * Note: this modifies the original iovec.
36 int memcpy_toiovec(struct iovec
*iov
, unsigned char *kdata
, int len
)
40 int copy
= min_t(unsigned int, iov
->iov_len
, len
);
41 if (copy_to_user(iov
->iov_base
, kdata
, copy
))
46 iov
->iov_base
+= copy
;
53 EXPORT_SYMBOL(memcpy_toiovec
);
56 * Copy kernel to iovec. Returns -EFAULT on error.
59 int memcpy_toiovecend(const struct iovec
*iov
, unsigned char *kdata
,
63 for (; len
> 0; ++iov
) {
64 /* Skip over the finished iovecs */
65 if (unlikely(offset
>= iov
->iov_len
)) {
66 offset
-= iov
->iov_len
;
69 copy
= min_t(unsigned int, iov
->iov_len
- offset
, len
);
70 if (copy_to_user(iov
->iov_base
+ offset
, kdata
, copy
))
79 EXPORT_SYMBOL(memcpy_toiovecend
);
82 * Copy iovec to kernel. Returns -EFAULT on error.
85 int memcpy_fromiovecend(unsigned char *kdata
, const struct iovec
*iov
,
92 /* Skip over the finished iovecs */
93 while (offset
>= iov
->iov_len
) {
94 offset
-= iov
->iov_len
;
99 u8 __user
*base
= iov
->iov_base
+ offset
;
100 int copy
= min_t(unsigned int, len
, iov
->iov_len
- offset
);
103 if (copy_from_user(kdata
, base
, copy
))
112 EXPORT_SYMBOL(memcpy_fromiovecend
);