Add xuio_* structures and typedefs.

Add the basic xuio structure and typedefs for Solaris style zero copy.
There's a decent chance this will not be the way I handle this on Linux
but providing the basic types simplifies things for now.

1 files changed, 50 insertions, 10 deletions

diff --git a/include/sys/uio.h b/include/sys/uio.h
index 83e9cc62a..87da72701 100644
--- a/include/sys/uio.h
+++ b/include/sys/uio.h
@@ -29,6 +29,8 @@
 #include <asm/uaccess.h>
 #include <sys/types.h>
 
+typedef struct iovec iovec_t;
+
 typedef enum uio_rw {
 	UIO_READ =	0,
 	UIO_WRITE =	1,
@@ -37,23 +39,61 @@ typedef enum uio_rw {
 typedef enum uio_seg {
 	UIO_USERSPACE =	0,
 	UIO_SYSSPACE =	1,
-	UIO_USERISPACE =2,
+	UIO_USERISPACE=	2,
 } uio_seg_t;
 
 typedef struct uio {
-	struct iovec	*uio_iov;	/* pointer to array of iovecs */
-	int		uio_iovcnt;	/* number of iovecs */
-	offset_t	uio_loffset;	/* file offset */
-	uio_seg_t	uio_segflg;	/* address space (kernel or user) */
-	uint16_t	uio_fmode;	/* file mode flags */
-	uint16_t	uio_extflg;	/* extended flags */
-	offset_t	uio_limit;	/* u-limit (maximum byte offset) */
-	ssize_t		uio_resid;	/* residual count */
+	struct iovec	*uio_iov;
+	int		uio_iovcnt;
+	offset_t	uio_loffset;
+	uio_seg_t	uio_segflg;
+	uint16_t	uio_fmode;
+	uint16_t	uio_extflg;
+	offset_t	uio_limit;
+	ssize_t		uio_resid;
 } uio_t;
 
 typedef struct aio_req {
-	uio_t		*aio_uio;	/* UIO for this request */
+	uio_t		*aio_uio;
 	void		*aio_private;
 } aio_req_t;
 
+typedef enum xuio_type {
+	UIOTYPE_ASYNCIO,
+	UIOTYPE_ZEROCOPY,
+} xuio_type_t;
+
+
+#define UIOA_IOV_MAX    16
+
+typedef struct uioa_page_s {
+	int	uioa_pfncnt;
+	void	**uioa_ppp;
+	caddr_t	uioa_base;
+	size_t	uioa_len;
+} uioa_page_t;
+
+typedef struct xuio {
+	uio_t xu_uio;
+	enum xuio_type xu_type;
+	union {
+		struct {
+			uint32_t xu_a_state;
+			ssize_t xu_a_mbytes;
+			uioa_page_t *xu_a_lcur;
+			void **xu_a_lppp;
+			void *xu_a_hwst[4];
+			uioa_page_t xu_a_locked[UIOA_IOV_MAX];
+		} xu_aio;
+
+		struct {
+			int xu_zc_rw;
+			void *xu_zc_priv;
+		} xu_zc;
+	} xu_ext;
+} xuio_t;
+
+#define XUIO_XUZC_PRIV(xuio)	xuio->xu_ext.xu_zc.xu_zc_priv
+#define XUIO_XUZC_RW(xuio)	xuio->xu_ext.xu_zc.xu_zc_rw
+
 #endif /* SPL_UIO_H */