de7056a3f9
We are gradually moving away from sector-based interfaces, towards byte-based. Make the change for the last few sector-based callbacks in the file-win32 driver. Note that the driver was already using byte-based calls for performing actual I/O, so this just gets rid of a round trip of scaling; however, as I don't know if Windows is tolerant of non-sector AIO operations, I went with the conservative approach of modifying .bdrv_refresh_limits to override the block layer defaults back to the pre-patch value of 512. Signed-off-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
69 lines
2.4 KiB
C
69 lines
2.4 KiB
C
/*
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* Declarations for AIO in the raw protocol
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#ifndef QEMU_RAW_AIO_H
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#define QEMU_RAW_AIO_H
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#include "qemu/coroutine.h"
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#include "qemu/iov.h"
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/* AIO request types */
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#define QEMU_AIO_READ 0x0001
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#define QEMU_AIO_WRITE 0x0002
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#define QEMU_AIO_IOCTL 0x0004
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#define QEMU_AIO_FLUSH 0x0008
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#define QEMU_AIO_DISCARD 0x0010
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#define QEMU_AIO_WRITE_ZEROES 0x0020
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#define QEMU_AIO_TYPE_MASK \
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(QEMU_AIO_READ|QEMU_AIO_WRITE|QEMU_AIO_IOCTL|QEMU_AIO_FLUSH| \
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QEMU_AIO_DISCARD|QEMU_AIO_WRITE_ZEROES)
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/* AIO flags */
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#define QEMU_AIO_MISALIGNED 0x1000
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#define QEMU_AIO_BLKDEV 0x2000
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/* linux-aio.c - Linux native implementation */
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#ifdef CONFIG_LINUX_AIO
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typedef struct LinuxAioState LinuxAioState;
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LinuxAioState *laio_init(void);
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void laio_cleanup(LinuxAioState *s);
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int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
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uint64_t offset, QEMUIOVector *qiov, int type);
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BlockAIOCB *laio_submit(BlockDriverState *bs, LinuxAioState *s, int fd,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockCompletionFunc *cb, void *opaque, int type);
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void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context);
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void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context);
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void laio_io_plug(BlockDriverState *bs, LinuxAioState *s);
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void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s);
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#endif
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#ifdef _WIN32
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typedef struct QEMUWin32AIOState QEMUWin32AIOState;
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QEMUWin32AIOState *win32_aio_init(void);
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void win32_aio_cleanup(QEMUWin32AIOState *aio);
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int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile);
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BlockAIOCB *win32_aio_submit(BlockDriverState *bs,
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QEMUWin32AIOState *aio, HANDLE hfile,
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uint64_t offset, uint64_t bytes, QEMUIOVector *qiov,
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BlockCompletionFunc *cb, void *opaque, int type);
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void win32_aio_detach_aio_context(QEMUWin32AIOState *aio,
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AioContext *old_context);
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void win32_aio_attach_aio_context(QEMUWin32AIOState *aio,
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AioContext *new_context);
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#endif
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#endif /* QEMU_RAW_AIO_H */
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