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51b154ed52
In the UAPI header files, __BIG_ENDIAN and __LITTLE_ENDIAN must be compared against __BYTE_ORDER in preprocessor conditionals where these are exposed to userspace (that is they're not inside __KERNEL__ conditionals). However, in the main kernel the norm is to check for "defined(__XXX_ENDIAN)" rather than comparing against __BYTE_ORDER and this has incorrectly leaked into the userspace headers. The definition of PADDED() in linux/aio_abi.h is wrong in this way. Note that userspace will likely interpret this and thus the order of fields in struct iocb incorrectly as the little-endian variant on big-endian machines - depending on header inclusion order. [!!!] NOTE [!!!] This patch may adversely change the userspace API. It might be better to fix the ordering of aio_key and aio_reserved1 in struct iocb. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Benjamin LaHaise <bcrl@kvack.org> Acked-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/* include/linux/aio_abi.h
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*
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* Copyright 2000,2001,2002 Red Hat.
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*
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* Written by Benjamin LaHaise <bcrl@kvack.org>
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*
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* Distribute under the terms of the GPLv2 (see ../../COPYING) or under
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* the following terms.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, provided that the above copyright
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* notice appears in all copies. This software is provided without any
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* warranty, express or implied. Red Hat makes no representations about
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* the suitability of this software for any purpose.
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*
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* IN NO EVENT SHALL RED HAT BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
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* SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF
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* THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF RED HAT HAS BEEN ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* RED HAT DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND
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* RED HAT HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
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* ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#ifndef __LINUX__AIO_ABI_H
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#define __LINUX__AIO_ABI_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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typedef __kernel_ulong_t aio_context_t;
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enum {
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IOCB_CMD_PREAD = 0,
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IOCB_CMD_PWRITE = 1,
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IOCB_CMD_FSYNC = 2,
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IOCB_CMD_FDSYNC = 3,
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/* These two are experimental.
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* IOCB_CMD_PREADX = 4,
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* IOCB_CMD_POLL = 5,
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*/
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IOCB_CMD_NOOP = 6,
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IOCB_CMD_PREADV = 7,
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IOCB_CMD_PWRITEV = 8,
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};
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/*
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* Valid flags for the "aio_flags" member of the "struct iocb".
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*
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* IOCB_FLAG_RESFD - Set if the "aio_resfd" member of the "struct iocb"
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* is valid.
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*/
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#define IOCB_FLAG_RESFD (1 << 0)
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/* read() from /dev/aio returns these structures. */
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struct io_event {
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__u64 data; /* the data field from the iocb */
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__u64 obj; /* what iocb this event came from */
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__s64 res; /* result code for this event */
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__s64 res2; /* secondary result */
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};
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#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN : defined(__LITTLE_ENDIAN)
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#define PADDED(x,y) x, y
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#elif defined(__BYTE_ORDER) ? __BYTE_ORDER == __BIG_ENDIAN : defined(__BIG_ENDIAN)
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#define PADDED(x,y) y, x
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#else
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#error edit for your odd byteorder.
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#endif
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/*
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* we always use a 64bit off_t when communicating
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* with userland. its up to libraries to do the
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* proper padding and aio_error abstraction
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*/
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struct iocb {
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/* these are internal to the kernel/libc. */
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__u64 aio_data; /* data to be returned in event's data */
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__u32 PADDED(aio_key, aio_reserved1);
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/* the kernel sets aio_key to the req # */
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/* common fields */
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__u16 aio_lio_opcode; /* see IOCB_CMD_ above */
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__s16 aio_reqprio;
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__u32 aio_fildes;
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__u64 aio_buf;
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__u64 aio_nbytes;
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__s64 aio_offset;
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/* extra parameters */
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__u64 aio_reserved2; /* TODO: use this for a (struct sigevent *) */
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/* flags for the "struct iocb" */
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__u32 aio_flags;
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/*
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* if the IOCB_FLAG_RESFD flag of "aio_flags" is set, this is an
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* eventfd to signal AIO readiness to
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*/
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__u32 aio_resfd;
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}; /* 64 bytes */
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#undef IFBIG
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#undef IFLITTLE
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#endif /* __LINUX__AIO_ABI_H */
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