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97a2ae3453
The code is similar to the implementation of discard and write_zeroes
with UNMAP. However, failure must be propagated up to block.c.
The stale page cache problem can be reproduced as follows:
# modprobe scsi-debug lbpws=1 lbprz=1
# ./qemu-io /dev/sdXX
qemu-io> write -P 0xcc 0 2M
qemu-io> write -z 0 1M
qemu-io> read -P 0x00 0 512
Pattern verification failed at offset 0, 512 bytes
qemu-io> read -v 0 512
00000000: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc ................
...
# ./qemu-io --cache=none /dev/sdXX
qemu-io> write -P 0xcc 0 2M
qemu-io> write -z 0 1M
qemu-io> read -P 0x00 0 512
qemu-io> read -v 0 512
00000000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
...
And similarly with discard instead of "write -z".
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
52 lines
1.6 KiB
C
52 lines
1.6 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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/* 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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void *laio_init(void);
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BlockDriverAIOCB *laio_submit(BlockDriverState *bs, void *aio_ctx, int fd,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque, int type);
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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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int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile);
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BlockDriverAIOCB *win32_aio_submit(BlockDriverState *bs,
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QEMUWin32AIOState *aio, HANDLE hfile,
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int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque, int type);
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#endif
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#endif /* QEMU_RAW_AIO_H */
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