1 /* 2 * Declarations for AIO in the raw protocol 3 * 4 * Copyright IBM, Corp. 2008 5 * 6 * Authors: 7 * Anthony Liguori <aliguori@us.ibm.com> 8 * 9 * This work is licensed under the terms of the GNU GPL, version 2. See 10 * the COPYING file in the top-level directory. 11 * 12 * Contributions after 2012-01-13 are licensed under the terms of the 13 * GNU GPL, version 2 or (at your option) any later version. 14 */ 15 16 #ifndef QEMU_RAW_AIO_H 17 #define QEMU_RAW_AIO_H 18 19 #include "block/aio.h" 20 #include "qemu/iov.h" 21 22 /* AIO request types */ 23 #define QEMU_AIO_READ 0x0001 24 #define QEMU_AIO_WRITE 0x0002 25 #define QEMU_AIO_IOCTL 0x0004 26 #define QEMU_AIO_FLUSH 0x0008 27 #define QEMU_AIO_DISCARD 0x0010 28 #define QEMU_AIO_WRITE_ZEROES 0x0020 29 #define QEMU_AIO_COPY_RANGE 0x0040 30 #define QEMU_AIO_TRUNCATE 0x0080 31 #define QEMU_AIO_TYPE_MASK \ 32 (QEMU_AIO_READ | \ 33 QEMU_AIO_WRITE | \ 34 QEMU_AIO_IOCTL | \ 35 QEMU_AIO_FLUSH | \ 36 QEMU_AIO_DISCARD | \ 37 QEMU_AIO_WRITE_ZEROES | \ 38 QEMU_AIO_COPY_RANGE | \ 39 QEMU_AIO_TRUNCATE) 40 41 /* AIO flags */ 42 #define QEMU_AIO_MISALIGNED 0x1000 43 #define QEMU_AIO_BLKDEV 0x2000 44 #define QEMU_AIO_NO_FALLBACK 0x4000 45 46 47 /* linux-aio.c - Linux native implementation */ 48 #ifdef CONFIG_LINUX_AIO 49 typedef struct LinuxAioState LinuxAioState; 50 LinuxAioState *laio_init(Error **errp); 51 void laio_cleanup(LinuxAioState *s); 52 53 /* laio_co_submit: submit I/O requests in the thread's current AioContext. */ 54 int coroutine_fn laio_co_submit(int fd, uint64_t offset, QEMUIOVector *qiov, 55 int type, uint64_t dev_max_batch); 56 57 void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context); 58 void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context); 59 60 /* 61 * laio_io_plug/unplug work in the thread's current AioContext, therefore the 62 * caller must ensure that they are paired in the same IOThread. 63 */ 64 void laio_io_plug(void); 65 void laio_io_unplug(uint64_t dev_max_batch); 66 #endif 67 /* io_uring.c - Linux io_uring implementation */ 68 #ifdef CONFIG_LINUX_IO_URING 69 typedef struct LuringState LuringState; 70 LuringState *luring_init(Error **errp); 71 void luring_cleanup(LuringState *s); 72 73 /* luring_co_submit: submit I/O requests in the thread's current AioContext. */ 74 int coroutine_fn luring_co_submit(BlockDriverState *bs, int fd, uint64_t offset, 75 QEMUIOVector *qiov, int type); 76 void luring_detach_aio_context(LuringState *s, AioContext *old_context); 77 void luring_attach_aio_context(LuringState *s, AioContext *new_context); 78 79 /* 80 * luring_io_plug/unplug work in the thread's current AioContext, therefore the 81 * caller must ensure that they are paired in the same IOThread. 82 */ 83 void luring_io_plug(void); 84 void luring_io_unplug(void); 85 #endif 86 87 #ifdef _WIN32 88 typedef struct QEMUWin32AIOState QEMUWin32AIOState; 89 QEMUWin32AIOState *win32_aio_init(void); 90 void win32_aio_cleanup(QEMUWin32AIOState *aio); 91 int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile); 92 BlockAIOCB *win32_aio_submit(BlockDriverState *bs, 93 QEMUWin32AIOState *aio, HANDLE hfile, 94 uint64_t offset, uint64_t bytes, QEMUIOVector *qiov, 95 BlockCompletionFunc *cb, void *opaque, int type); 96 void win32_aio_detach_aio_context(QEMUWin32AIOState *aio, 97 AioContext *old_context); 98 void win32_aio_attach_aio_context(QEMUWin32AIOState *aio, 99 AioContext *new_context); 100 #endif 101 102 #endif /* QEMU_RAW_AIO_H */ 103