Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / include / uapi / linux / aio_abi.h

diff --git a/kernel/include/uapi/linux/aio_abi.h b/kernel/include/uapi/linux/aio_abi.h
new file mode 100644 (file)
index 0000000..bb2554f
--- /dev/null
+++ b/kernel/include/uapi/linux/aio_abi.h
@@ -0,0 +1,111 @@
+/* include/linux/aio_abi.h
+ *
+ * Copyright 2000,2001,2002 Red Hat.
+ *
+ * Written by Benjamin LaHaise <bcrl@kvack.org>
+ *
+ * Distribute under the terms of the GPLv2 (see ../../COPYING) or under 
+ * the following terms.
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation is hereby granted, provided that the above copyright
+ * notice appears in all copies.  This software is provided without any
+ * warranty, express or implied.  Red Hat makes no representations about
+ * the suitability of this software for any purpose.
+ *
+ * IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
+ * SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
+ * THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
+ * RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
+ * ENHANCEMENTS, OR MODIFICATIONS.
+ */
+#ifndef __LINUX__AIO_ABI_H
+#define __LINUX__AIO_ABI_H
+
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+typedef __kernel_ulong_t aio_context_t;
+
+enum {
+       IOCB_CMD_PREAD = 0,
+       IOCB_CMD_PWRITE = 1,
+       IOCB_CMD_FSYNC = 2,
+       IOCB_CMD_FDSYNC = 3,
+       /* These two are experimental.
+        * IOCB_CMD_PREADX = 4,
+        * IOCB_CMD_POLL = 5,
+        */
+       IOCB_CMD_NOOP = 6,
+       IOCB_CMD_PREADV = 7,
+       IOCB_CMD_PWRITEV = 8,
+};
+
+/*
+ * Valid flags for the "aio_flags" member of the "struct iocb".
+ *
+ * IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb"
+ *                   is valid.
+ */
+#define IOCB_FLAG_RESFD                (1 << 0)
+
+/* read() from /dev/aio returns these structures. */
+struct io_event {
+       __u64           data;           /* the data field from the iocb */
+       __u64           obj;            /* what iocb this event came from */
+       __s64           res;            /* result code for this event */
+       __s64           res2;           /* secondary result */
+};
+
+#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
+#define PADDED(x,y)    x, y
+#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)
+#define PADDED(x,y)    y, x
+#else
+#error edit for your odd byteorder.
+#endif
+
+/*
+ * we always use a 64bit off_t when communicating
+ * with userland.  its up to libraries to do the
+ * proper padding and aio_error abstraction
+ */
+
+struct iocb {
+       /* these are internal to the kernel/libc. */
+       __u64   aio_data;       /* data to be returned in event's data */
+       __u32   PADDED(aio_key, aio_reserved1);
+                               /* the kernel sets aio_key to the req # */
+
+       /* common fields */
+       __u16   aio_lio_opcode; /* see IOCB_CMD_ above */
+       __s16   aio_reqprio;
+       __u32   aio_fildes;
+
+       __u64   aio_buf;
+       __u64   aio_nbytes;
+       __s64   aio_offset;
+
+       /* extra parameters */
+       __u64   aio_reserved2;  /* TODO: use this for a (struct sigevent *) */
+
+       /* flags for the "struct iocb" */
+       __u32   aio_flags;
+
+       /*
+        * if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an
+        * eventfd to signal AIO readiness to
+        */
+       __u32   aio_resfd;
+}; /* 64 bytes */
+
+#undef IFBIG
+#undef IFLITTLE
+
+#endif /* __LINUX__AIO_ABI_H */
+