/* * QEMU posix-aio emulation * * Copyright IBM, Corp. 2008 * * Authors: * Anthony Liguori <aliguori@us.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2. See * the COPYING file in the top-level directory. * */ #ifndef QEMU_POSIX_AIO_COMPAT_H #define QEMU_POSIX_AIO_COMPAT_H #include <sys/types.h> #include <unistd.h> #include <signal.h> #include "sys-queue.h" #define QEMU_PAIO_CANCELED 0x01 #define QEMU_PAIO_NOTCANCELED 0x02 #define QEMU_PAIO_ALLDONE 0x03 struct qemu_paiocb { int aio_fildes; union { struct iovec *aio_iov; void *aio_ioctl_buf; }; int aio_niov; size_t aio_nbytes; #define aio_ioctl_cmd aio_nbytes /* for QEMU_PAIO_IOCTL */ int ev_signo; off_t aio_offset; unsigned aio_flags; /* 512 byte alignment required for buffer, offset and length */ #define QEMU_AIO_SECTOR_ALIGNED 0x01 /* private */ TAILQ_ENTRY(qemu_paiocb) node; int aio_type; #define QEMU_PAIO_READ 0x01 #define QEMU_PAIO_WRITE 0x02 #define QEMU_PAIO_IOCTL 0x03 ssize_t ret; int active; }; struct qemu_paioinit { unsigned int aio_threads; unsigned int aio_num; unsigned int aio_idle_time; }; int qemu_paio_init(struct qemu_paioinit *aioinit); int qemu_paio_read(struct qemu_paiocb *aiocb); int qemu_paio_write(struct qemu_paiocb *aiocb); int qemu_paio_ioctl(struct qemu_paiocb *aiocb); int qemu_paio_error(struct qemu_paiocb *aiocb); ssize_t qemu_paio_return(struct qemu_paiocb *aiocb); int qemu_paio_cancel(int fd, struct qemu_paiocb *aiocb); #endif