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lib/iovec.c
1.69 KB
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Hoist memcpy_from...
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#include <linux/uaccess.h>
#include <linux/export.h>
#include <linux/uio.h>
/*
* Copy iovec to kernel. Returns -EFAULT on error.
*
* Note: this modifies the original iovec.
*/
int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len)
{
while (len > 0) {
if (iov->iov_len) {
int copy = min_t(unsigned int, len, iov->iov_len);
if (copy_from_user(kdata, iov->iov_base, copy))
return -EFAULT;
len -= copy;
kdata += copy;
iov->iov_base += copy;
iov->iov_len -= copy;
}
iov++;
}
return 0;
}
EXPORT_SYMBOL(memcpy_fromiovec);
/*
* Copy kernel to iovec. Returns -EFAULT on error.
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*/
int memcpy_toiovecend(const struct iovec *iov, unsigned char *kdata,
int offset, int len)
{
int copy;
for (; len > 0; ++iov) {
/* Skip over the finished iovecs */
if (unlikely(offset >= iov->iov_len)) {
offset -= iov->iov_len;
continue;
}
copy = min_t(unsigned int, iov->iov_len - offset, len);
if (copy_to_user(iov->iov_base + offset, kdata, copy))
return -EFAULT;
offset = 0;
kdata += copy;
len -= copy;
}
return 0;
}
EXPORT_SYMBOL(memcpy_toiovecend);
/*
* Copy iovec to kernel. Returns -EFAULT on error.
*/
int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov,
int offset, int len)
{
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/* Skip over the finished iovecs */
while (offset >= iov->iov_len) {
offset -= iov->iov_len;
iov++;
}
while (len > 0) {
u8 __user *base = iov->iov_base + offset;
int copy = min_t(unsigned int, len, iov->iov_len - offset);
offset = 0;
if (copy_from_user(kdata, base, copy))
return -EFAULT;
len -= copy;
kdata += copy;
iov++;
}
return 0;
}
EXPORT_SYMBOL(memcpy_fromiovecend);
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