Commit 2ad9bd83 authored by Jens Axboe's avatar Jens Axboe
Browse files

iov: add import_ubuf() 



Like import_single_range(), but for ITER_UBUF.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarKeith Busch <kbusch@kernel.org>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
parent b7bfaa76

include/linux/uio.h

+1 −0
Original line number Diff line number Diff line
@@ -346,6 +346,7 @@ ssize_t __import_iovec(int type, const struct iovec __user *uvec, 
		 struct iov_iter *i, bool compat);

int import_single_range(int type, void __user *buf, size_t len,

		 struct iovec *iov, struct iov_iter *i);

int import_ubuf(int type, void __user *buf, size_t len, struct iov_iter *i);



static inline void iov_iter_ubuf(struct iov_iter *i, unsigned int direction,

			void __user *buf, size_t count)

lib/iov_iter.c

+11 −0
Original line number Diff line number Diff line
@@ -1877,6 +1877,17 @@ int import_single_range(int rw, void __user *buf, size_t len, 
}

EXPORT_SYMBOL(import_single_range);



int import_ubuf(int rw, void __user *buf, size_t len, struct iov_iter *i)

{

	if (len > MAX_RW_COUNT)

		len = MAX_RW_COUNT;

	if (unlikely(!access_ok(buf, len)))

		return -EFAULT;



	iov_iter_ubuf(i, rw, buf, len);

	return 0;

}



/**

 * iov_iter_restore() - Restore a &struct iov_iter to the same state as when

 *     iov_iter_save_state() was called.