diff options
Diffstat (limited to 'net/core/iovec.c')
| -rw-r--r-- | net/core/iovec.c | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/net/core/iovec.c b/net/core/iovec.c index 4c9c0121c9da..16ad45d4882b 100644 --- a/net/core/iovec.c +++ b/net/core/iovec.c @@ -98,6 +98,31 @@ int memcpy_toiovec(struct iovec *iov, unsigned char *kdata, int len) } /* + * Copy kernel to iovec. Returns -EFAULT on error. + */ + +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; +} + +/* * Copy iovec to kernel. Returns -EFAULT on error. * * Note: this modifies the original iovec. @@ -122,10 +147,11 @@ int memcpy_fromiovec(unsigned char *kdata, struct iovec *iov, int len) } /* - * For use with ip_build_xmit + * Copy iovec from kernel. Returns -EFAULT on error. */ -int memcpy_fromiovecend(unsigned char *kdata, struct iovec *iov, int offset, - int len) + +int memcpy_fromiovecend(unsigned char *kdata, const struct iovec *iov, + int offset, int len) { /* Skip over the finished iovecs */ while (offset >= iov->iov_len) { @@ -236,3 +262,4 @@ EXPORT_SYMBOL(csum_partial_copy_fromiovecend); EXPORT_SYMBOL(memcpy_fromiovec); EXPORT_SYMBOL(memcpy_fromiovecend); EXPORT_SYMBOL(memcpy_toiovec); +EXPORT_SYMBOL(memcpy_toiovecend); |