Prepare SPL repo to merge with ZFS repo

[mirror_spl.git] / include / spl / sys / uio.h

diff --git a/include/spl/sys/uio.h b/include/spl/sys/uio.h
new file mode 100644 (file)
index 0000000..64c452b
--- /dev/null
+++ b/include/spl/sys/uio.h
@@ -0,0 +1,106 @@
+/*
+ *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
+ *  Copyright (C) 2007 The Regents of the University of California.
+ *  Copyright (c) 2015 by Chunwei Chen. All rights reserved.
+ *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
+ *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
+ *  UCRL-CODE-235197
+ *
+ *  This file is part of the SPL, Solaris Porting Layer.
+ *  For details, see <http://zfsonlinux.org/>.
+ *
+ *  The SPL is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License as published by the
+ *  Free Software Foundation; either version 2 of the License, or (at your
+ *  option) any later version.
+ *
+ *  The SPL is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _SPL_UIO_H
+#define        _SPL_UIO_H
+
+#include <linux/uio.h>
+#include <linux/blkdev.h>
+#include <asm/uaccess.h>
+#include <sys/types.h>
+
+typedef struct iovec iovec_t;
+
+typedef enum uio_rw {
+       UIO_READ =              0,
+       UIO_WRITE =             1,
+} uio_rw_t;
+
+typedef enum uio_seg {
+       UIO_USERSPACE =         0,
+       UIO_SYSSPACE =          1,
+       UIO_USERISPACE =        2,
+       UIO_BVEC =              3,
+} uio_seg_t;
+
+typedef struct uio {
+       union {
+               const struct iovec      *uio_iov;
+               const struct bio_vec    *uio_bvec;
+       };
+       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;
+       size_t          uio_skip;
+} uio_t;
+
+typedef struct aio_req {
+       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 */