From patchwork Fri Jul 15 17:59:16 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 9232425 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0C4DC60868 for ; Fri, 15 Jul 2016 18:25:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E989D2236A for ; Fri, 15 Jul 2016 18:25:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DDEE1228C9; Fri, 15 Jul 2016 18:25:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id C70722236A for ; Fri, 15 Jul 2016 18:25:15 +0000 (UTC) Received: from localhost ([::1]:34283 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bO7nW-0001lh-Cd for patchwork-qemu-devel@patchwork.kernel.org; Fri, 15 Jul 2016 14:25:14 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48779) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bO7Od-00038p-85 for qemu-devel@nongnu.org; Fri, 15 Jul 2016 13:59:37 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bO7OX-0007AC-UZ for qemu-devel@nongnu.org; Fri, 15 Jul 2016 13:59:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:55068) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bO7OX-00079h-Ly for qemu-devel@nongnu.org; Fri, 15 Jul 2016 13:59:25 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3162B142586; Fri, 15 Jul 2016 17:59:25 +0000 (UTC) Received: from localhost (ovpn-112-63.ams2.redhat.com [10.36.112.63]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u6FHxNjb003679; Fri, 15 Jul 2016 13:59:24 -0400 From: Stefan Hajnoczi To: Date: Fri, 15 Jul 2016 18:59:16 +0100 Message-Id: <1468605558-3785-3-git-send-email-stefanha@redhat.com> In-Reply-To: <1468605558-3785-1-git-send-email-stefanha@redhat.com> References: <1468605558-3785-1-git-send-email-stefanha@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.24 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.26]); Fri, 15 Jul 2016 17:59:25 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 2/4] linux-aio: share one LinuxAioState within an AioContext X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Stefan Hajnoczi , Paolo Bonzini Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Paolo Bonzini This has better performance because it executes fewer system calls and does not use a bottom half per disk. Originally proposed by Ming Lei. Acked-by: Stefan Hajnoczi Signed-off-by: Paolo Bonzini Message-id: 1467650000-51385-1-git-send-email-pbonzini@redhat.com Signed-off-by: Stefan Hajnoczi --- async.c | 23 ++++++++++ block/linux-aio.c | 10 ++-- block/raw-aio.h | 68 --------------------------- block/raw-posix.c | 119 ++++++------------------------------------------ block/raw-win32.c | 2 +- include/block/aio.h | 13 ++++++ include/block/raw-aio.h | 68 +++++++++++++++++++++++++++ 7 files changed, 125 insertions(+), 178 deletions(-) delete mode 100644 block/raw-aio.h create mode 100644 include/block/raw-aio.h diff --git a/async.c b/async.c index b4bf205..6caa98c 100644 --- a/async.c +++ b/async.c @@ -29,6 +29,7 @@ #include "block/thread-pool.h" #include "qemu/main-loop.h" #include "qemu/atomic.h" +#include "block/raw-aio.h" /***********************************************************/ /* bottom halves (can be seen as timers which expire ASAP) */ @@ -242,6 +243,14 @@ aio_ctx_finalize(GSource *source) qemu_bh_delete(ctx->notify_dummy_bh); thread_pool_free(ctx->thread_pool); +#ifdef CONFIG_LINUX_AIO + if (ctx->linux_aio) { + laio_detach_aio_context(ctx->linux_aio, ctx); + laio_cleanup(ctx->linux_aio); + ctx->linux_aio = NULL; + } +#endif + qemu_mutex_lock(&ctx->bh_lock); while (ctx->first_bh) { QEMUBH *next = ctx->first_bh->next; @@ -282,6 +291,17 @@ ThreadPool *aio_get_thread_pool(AioContext *ctx) return ctx->thread_pool; } +#ifdef CONFIG_LINUX_AIO +LinuxAioState *aio_get_linux_aio(AioContext *ctx) +{ + if (!ctx->linux_aio) { + ctx->linux_aio = laio_init(); + laio_attach_aio_context(ctx->linux_aio, ctx); + } + return ctx->linux_aio; +} +#endif + void aio_notify(AioContext *ctx) { /* Write e.g. bh->scheduled before reading ctx->notify_me. Pairs @@ -345,6 +365,9 @@ AioContext *aio_context_new(Error **errp) false, (EventNotifierHandler *) event_notifier_dummy_cb); +#ifdef CONFIG_LINUX_AIO + ctx->linux_aio = NULL; +#endif ctx->thread_pool = NULL; qemu_mutex_init(&ctx->bh_lock); rfifolock_init(&ctx->lock, aio_rfifolock_cb, ctx); diff --git a/block/linux-aio.c b/block/linux-aio.c index 5c104bd..1d702a5 100644 --- a/block/linux-aio.c +++ b/block/linux-aio.c @@ -50,6 +50,8 @@ typedef struct { } LaioQueue; struct LinuxAioState { + AioContext *aio_context; + io_context_t ctx; EventNotifier e; @@ -227,15 +229,14 @@ static void ioq_submit(LinuxAioState *s) void laio_io_plug(BlockDriverState *bs, LinuxAioState *s) { - assert(!s->io_q.plugged); - s->io_q.plugged = 1; + s->io_q.plugged++; } void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s) { assert(s->io_q.plugged); - s->io_q.plugged = 0; - if (!s->io_q.blocked && !QSIMPLEQ_EMPTY(&s->io_q.pending)) { + if (--s->io_q.plugged == 0 && + !s->io_q.blocked && !QSIMPLEQ_EMPTY(&s->io_q.pending)) { ioq_submit(s); } } @@ -325,6 +326,7 @@ void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context) void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context) { + s->aio_context = new_context; s->completion_bh = aio_bh_new(new_context, qemu_laio_completion_bh, s); aio_set_event_notifier(new_context, &s->e, false, qemu_laio_completion_cb); diff --git a/block/raw-aio.h b/block/raw-aio.h deleted file mode 100644 index a4cdbbf..0000000 --- a/block/raw-aio.h +++ /dev/null @@ -1,68 +0,0 @@ -/* - * Declarations for AIO in the raw protocol - * - * Copyright IBM, Corp. 2008 - * - * Authors: - * Anthony Liguori - * - * This work is licensed under the terms of the GNU GPL, version 2. See - * the COPYING file in the top-level directory. - * - * Contributions after 2012-01-13 are licensed under the terms of the - * GNU GPL, version 2 or (at your option) any later version. - */ -#ifndef QEMU_RAW_AIO_H -#define QEMU_RAW_AIO_H - -#include "qemu/coroutine.h" -#include "qemu/iov.h" - -/* AIO request types */ -#define QEMU_AIO_READ 0x0001 -#define QEMU_AIO_WRITE 0x0002 -#define QEMU_AIO_IOCTL 0x0004 -#define QEMU_AIO_FLUSH 0x0008 -#define QEMU_AIO_DISCARD 0x0010 -#define QEMU_AIO_WRITE_ZEROES 0x0020 -#define QEMU_AIO_TYPE_MASK \ - (QEMU_AIO_READ|QEMU_AIO_WRITE|QEMU_AIO_IOCTL|QEMU_AIO_FLUSH| \ - QEMU_AIO_DISCARD|QEMU_AIO_WRITE_ZEROES) - -/* AIO flags */ -#define QEMU_AIO_MISALIGNED 0x1000 -#define QEMU_AIO_BLKDEV 0x2000 - - -/* linux-aio.c - Linux native implementation */ -#ifdef CONFIG_LINUX_AIO -typedef struct LinuxAioState LinuxAioState; -LinuxAioState *laio_init(void); -void laio_cleanup(LinuxAioState *s); -int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd, - uint64_t offset, QEMUIOVector *qiov, int type); -BlockAIOCB *laio_submit(BlockDriverState *bs, LinuxAioState *s, int fd, - int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, - BlockCompletionFunc *cb, void *opaque, int type); -void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context); -void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context); -void laio_io_plug(BlockDriverState *bs, LinuxAioState *s); -void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s); -#endif - -#ifdef _WIN32 -typedef struct QEMUWin32AIOState QEMUWin32AIOState; -QEMUWin32AIOState *win32_aio_init(void); -void win32_aio_cleanup(QEMUWin32AIOState *aio); -int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile); -BlockAIOCB *win32_aio_submit(BlockDriverState *bs, - QEMUWin32AIOState *aio, HANDLE hfile, - int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, - BlockCompletionFunc *cb, void *opaque, int type); -void win32_aio_detach_aio_context(QEMUWin32AIOState *aio, - AioContext *old_context); -void win32_aio_attach_aio_context(QEMUWin32AIOState *aio, - AioContext *new_context); -#endif - -#endif /* QEMU_RAW_AIO_H */ diff --git a/block/raw-posix.c b/block/raw-posix.c index d1c3bd8..20f4d7a 100644 --- a/block/raw-posix.c +++ b/block/raw-posix.c @@ -32,7 +32,7 @@ #include "trace.h" #include "block/thread-pool.h" #include "qemu/iov.h" -#include "raw-aio.h" +#include "block/raw-aio.h" #include "qapi/util.h" #include "qapi/qmp/qstring.h" @@ -137,10 +137,6 @@ typedef struct BDRVRawState { int open_flags; size_t buf_align; -#ifdef CONFIG_LINUX_AIO - int use_aio; - LinuxAioState *aio_ctx; -#endif #ifdef CONFIG_XFS bool is_xfs:1; #endif @@ -154,9 +150,6 @@ typedef struct BDRVRawState { typedef struct BDRVRawReopenState { int fd; int open_flags; -#ifdef CONFIG_LINUX_AIO - int use_aio; -#endif } BDRVRawReopenState; static int fd_open(BlockDriverState *bs); @@ -374,58 +367,15 @@ static void raw_parse_flags(int bdrv_flags, int *open_flags) } } -static void raw_detach_aio_context(BlockDriverState *bs) -{ -#ifdef CONFIG_LINUX_AIO - BDRVRawState *s = bs->opaque; - - if (s->use_aio) { - laio_detach_aio_context(s->aio_ctx, bdrv_get_aio_context(bs)); - } -#endif -} - -static void raw_attach_aio_context(BlockDriverState *bs, - AioContext *new_context) -{ -#ifdef CONFIG_LINUX_AIO - BDRVRawState *s = bs->opaque; - - if (s->use_aio) { - laio_attach_aio_context(s->aio_ctx, new_context); - } -#endif -} - #ifdef CONFIG_LINUX_AIO -static int raw_set_aio(LinuxAioState **aio_ctx, int *use_aio, int bdrv_flags) +static bool raw_use_aio(int bdrv_flags) { - int ret = -1; - assert(aio_ctx != NULL); - assert(use_aio != NULL); /* * Currently Linux do AIO only for files opened with O_DIRECT * specified so check NOCACHE flag too */ - if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) == - (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) { - - /* if non-NULL, laio_init() has already been run */ - if (*aio_ctx == NULL) { - *aio_ctx = laio_init(); - if (!*aio_ctx) { - goto error; - } - } - *use_aio = 1; - } else { - *use_aio = 0; - } - - ret = 0; - -error: - return ret; + return (bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) == + (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO); } #endif @@ -494,13 +444,7 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, s->fd = fd; #ifdef CONFIG_LINUX_AIO - if (raw_set_aio(&s->aio_ctx, &s->use_aio, bdrv_flags)) { - qemu_close(fd); - ret = -errno; - error_setg_errno(errp, -ret, "Could not set AIO state"); - goto fail; - } - if (!s->use_aio && (bdrv_flags & BDRV_O_NATIVE_AIO)) { + if (!raw_use_aio(bdrv_flags) && (bdrv_flags & BDRV_O_NATIVE_AIO)) { error_setg(errp, "aio=native was specified, but it requires " "cache.direct=on, which was not specified."); ret = -EINVAL; @@ -567,8 +511,6 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, } #endif - raw_attach_aio_context(bs, bdrv_get_aio_context(bs)); - ret = 0; fail: if (filename && (bdrv_flags & BDRV_O_TEMPORARY)) { @@ -603,18 +545,6 @@ static int raw_reopen_prepare(BDRVReopenState *state, state->opaque = g_new0(BDRVRawReopenState, 1); raw_s = state->opaque; -#ifdef CONFIG_LINUX_AIO - raw_s->use_aio = s->use_aio; - - /* we can use s->aio_ctx instead of a copy, because the use_aio flag is - * valid in the 'false' condition even if aio_ctx is set, and raw_set_aio() - * won't override aio_ctx if aio_ctx is non-NULL */ - if (raw_set_aio(&s->aio_ctx, &raw_s->use_aio, state->flags)) { - error_setg(errp, "Could not set AIO state"); - return -1; - } -#endif - if (s->type == FTYPE_CD) { raw_s->open_flags |= O_NONBLOCK; } @@ -689,9 +619,6 @@ static void raw_reopen_commit(BDRVReopenState *state) qemu_close(s->fd); s->fd = raw_s->fd; -#ifdef CONFIG_LINUX_AIO - s->use_aio = raw_s->use_aio; -#endif g_free(state->opaque); state->opaque = NULL; @@ -1329,9 +1256,10 @@ static int coroutine_fn raw_co_prw(BlockDriverState *bs, uint64_t offset, if (!bdrv_qiov_is_aligned(bs, qiov)) { type |= QEMU_AIO_MISALIGNED; #ifdef CONFIG_LINUX_AIO - } else if (s->use_aio) { + } else if (bs->open_flags & BDRV_O_NATIVE_AIO) { + LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs)); assert(qiov->size == bytes); - return laio_co_submit(bs, s->aio_ctx, s->fd, offset, qiov, type); + return laio_co_submit(bs, aio, s->fd, offset, qiov, type); #endif } } @@ -1357,9 +1285,9 @@ static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset, static void raw_aio_plug(BlockDriverState *bs) { #ifdef CONFIG_LINUX_AIO - BDRVRawState *s = bs->opaque; - if (s->use_aio) { - laio_io_plug(bs, s->aio_ctx); + if (bs->open_flags & BDRV_O_NATIVE_AIO) { + LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs)); + laio_io_plug(bs, aio); } #endif } @@ -1367,9 +1295,9 @@ static void raw_aio_plug(BlockDriverState *bs) static void raw_aio_unplug(BlockDriverState *bs) { #ifdef CONFIG_LINUX_AIO - BDRVRawState *s = bs->opaque; - if (s->use_aio) { - laio_io_unplug(bs, s->aio_ctx); + if (bs->open_flags & BDRV_O_NATIVE_AIO) { + LinuxAioState *aio = aio_get_linux_aio(bdrv_get_aio_context(bs)); + laio_io_unplug(bs, aio); } #endif } @@ -1389,13 +1317,6 @@ static void raw_close(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; - raw_detach_aio_context(bs); - -#ifdef CONFIG_LINUX_AIO - if (s->use_aio) { - laio_cleanup(s->aio_ctx); - } -#endif if (s->fd >= 0) { qemu_close(s->fd); s->fd = -1; @@ -1954,9 +1875,6 @@ BlockDriver bdrv_file = { .bdrv_get_allocated_file_size = raw_get_allocated_file_size, - .bdrv_detach_aio_context = raw_detach_aio_context, - .bdrv_attach_aio_context = raw_attach_aio_context, - .create_opts = &raw_create_opts, }; @@ -2402,9 +2320,6 @@ static BlockDriver bdrv_host_device = { .bdrv_probe_blocksizes = hdev_probe_blocksizes, .bdrv_probe_geometry = hdev_probe_geometry, - .bdrv_detach_aio_context = raw_detach_aio_context, - .bdrv_attach_aio_context = raw_attach_aio_context, - /* generic scsi device */ #ifdef __linux__ .bdrv_aio_ioctl = hdev_aio_ioctl, @@ -2524,9 +2439,6 @@ static BlockDriver bdrv_host_cdrom = { .bdrv_get_allocated_file_size = raw_get_allocated_file_size, - .bdrv_detach_aio_context = raw_detach_aio_context, - .bdrv_attach_aio_context = raw_attach_aio_context, - /* removable device support */ .bdrv_is_inserted = cdrom_is_inserted, .bdrv_eject = cdrom_eject, @@ -2657,9 +2569,6 @@ static BlockDriver bdrv_host_cdrom = { .bdrv_get_allocated_file_size = raw_get_allocated_file_size, - .bdrv_detach_aio_context = raw_detach_aio_context, - .bdrv_attach_aio_context = raw_attach_aio_context, - /* removable device support */ .bdrv_is_inserted = cdrom_is_inserted, .bdrv_eject = cdrom_eject, diff --git a/block/raw-win32.c b/block/raw-win32.c index 62edb1a..9b813d9 100644 --- a/block/raw-win32.c +++ b/block/raw-win32.c @@ -27,7 +27,7 @@ #include "qemu/timer.h" #include "block/block_int.h" #include "qemu/module.h" -#include "raw-aio.h" +#include "block/raw-aio.h" #include "trace.h" #include "block/thread-pool.h" #include "qemu/iov.h" diff --git a/include/block/aio.h b/include/block/aio.h index 88a64ee..afd72a7 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -47,6 +47,9 @@ typedef struct AioHandler AioHandler; typedef void QEMUBHFunc(void *opaque); typedef void IOHandler(void *opaque); +struct ThreadPool; +struct LinuxAioState; + struct AioContext { GSource source; @@ -119,6 +122,13 @@ struct AioContext { /* Thread pool for performing work and receiving completion callbacks */ struct ThreadPool *thread_pool; +#ifdef CONFIG_LINUX_AIO + /* State for native Linux AIO. Uses aio_context_acquire/release for + * locking. + */ + struct LinuxAioState *linux_aio; +#endif + /* TimerLists for calling timers - one per clock type */ QEMUTimerListGroup tlg; @@ -335,6 +345,9 @@ GSource *aio_get_g_source(AioContext *ctx); /* Return the ThreadPool bound to this AioContext */ struct ThreadPool *aio_get_thread_pool(AioContext *ctx); +/* Return the LinuxAioState bound to this AioContext */ +struct LinuxAioState *aio_get_linux_aio(AioContext *ctx); + /** * aio_timer_new: * @ctx: the aio context diff --git a/include/block/raw-aio.h b/include/block/raw-aio.h new file mode 100644 index 0000000..a4cdbbf --- /dev/null +++ b/include/block/raw-aio.h @@ -0,0 +1,68 @@ +/* + * Declarations for AIO in the raw protocol + * + * Copyright IBM, Corp. 2008 + * + * Authors: + * Anthony Liguori + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + * Contributions after 2012-01-13 are licensed under the terms of the + * GNU GPL, version 2 or (at your option) any later version. + */ +#ifndef QEMU_RAW_AIO_H +#define QEMU_RAW_AIO_H + +#include "qemu/coroutine.h" +#include "qemu/iov.h" + +/* AIO request types */ +#define QEMU_AIO_READ 0x0001 +#define QEMU_AIO_WRITE 0x0002 +#define QEMU_AIO_IOCTL 0x0004 +#define QEMU_AIO_FLUSH 0x0008 +#define QEMU_AIO_DISCARD 0x0010 +#define QEMU_AIO_WRITE_ZEROES 0x0020 +#define QEMU_AIO_TYPE_MASK \ + (QEMU_AIO_READ|QEMU_AIO_WRITE|QEMU_AIO_IOCTL|QEMU_AIO_FLUSH| \ + QEMU_AIO_DISCARD|QEMU_AIO_WRITE_ZEROES) + +/* AIO flags */ +#define QEMU_AIO_MISALIGNED 0x1000 +#define QEMU_AIO_BLKDEV 0x2000 + + +/* linux-aio.c - Linux native implementation */ +#ifdef CONFIG_LINUX_AIO +typedef struct LinuxAioState LinuxAioState; +LinuxAioState *laio_init(void); +void laio_cleanup(LinuxAioState *s); +int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd, + uint64_t offset, QEMUIOVector *qiov, int type); +BlockAIOCB *laio_submit(BlockDriverState *bs, LinuxAioState *s, int fd, + int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, + BlockCompletionFunc *cb, void *opaque, int type); +void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context); +void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context); +void laio_io_plug(BlockDriverState *bs, LinuxAioState *s); +void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s); +#endif + +#ifdef _WIN32 +typedef struct QEMUWin32AIOState QEMUWin32AIOState; +QEMUWin32AIOState *win32_aio_init(void); +void win32_aio_cleanup(QEMUWin32AIOState *aio); +int win32_aio_attach(QEMUWin32AIOState *aio, HANDLE hfile); +BlockAIOCB *win32_aio_submit(BlockDriverState *bs, + QEMUWin32AIOState *aio, HANDLE hfile, + int64_t sector_num, QEMUIOVector *qiov, int nb_sectors, + BlockCompletionFunc *cb, void *opaque, int type); +void win32_aio_detach_aio_context(QEMUWin32AIOState *aio, + AioContext *old_context); +void win32_aio_attach_aio_context(QEMUWin32AIOState *aio, + AioContext *new_context); +#endif + +#endif /* QEMU_RAW_AIO_H */