From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52419) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fYBkX-0005Qy-Te for qemu-devel@nongnu.org; Wed, 27 Jun 2018 10:48:53 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fYBkW-00054u-Lj for qemu-devel@nongnu.org; Wed, 27 Jun 2018 10:48:49 -0400 From: Stefan Hajnoczi Date: Wed, 27 Jun 2018 15:48:38 +0100 Message-Id: <20180627144838.26772-3-stefanha@redhat.com> In-Reply-To: <20180627144838.26772-1-stefanha@redhat.com> References: <20180627144838.26772-1-stefanha@redhat.com> Subject: [Qemu-devel] [PULL 2/2] linux-aio: properly bubble up errors from initialization List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, Peter Maydell From: Nishanth Aravamudan laio_init() can fail for a couple of reasons, which will lead to a NULL pointer dereference in laio_attach_aio_context(). To solve this, add a aio_setup_linux_aio() function which is called early in raw_open_common. If this fails, propagate the error up. The signature of aio_get_linux_aio() was not modified, because it seems preferable to return the actual errno from the possible failing initialization calls. Additionally, when the AioContext changes, we need to associate a LinuxAioState with the new AioContext. Use the bdrv_attach_aio_context callback and call the new aio_setup_linux_aio(), which will allocate a new AioContext if needed, and return errors on failures. If it fails for any reason, fallback to threaded AIO with an error message, as the device is already in-use by the guest. Add an assert that aio_get_linux_aio() cannot return NULL. Signed-off-by: Nishanth Aravamudan Message-id: 20180622193700.6523-1-naravamudan@digitalocean.com Signed-off-by: Stefan Hajnoczi --- include/block/aio.h | 3 +++ include/block/raw-aio.h | 2 +- block/file-posix.c | 33 ++++++++++++++++++++++++++++----- block/linux-aio.c | 12 +++++++++--- stubs/linux-aio.c | 2 +- util/async.c | 14 +++++++++++--- 6 files changed, 53 insertions(+), 13 deletions(-) diff --git a/include/block/aio.h b/include/block/aio.h index ae6f354e6c..f08630c6e5 100644 --- a/include/block/aio.h +++ b/include/block/aio.h @@ -381,6 +381,9 @@ GSource *aio_get_g_source(AioContext *ctx); /* Return the ThreadPool bound to this AioContext */ struct ThreadPool *aio_get_thread_pool(AioContext *ctx); +/* Setup the LinuxAioState bound to this AioContext */ +struct LinuxAioState *aio_setup_linux_aio(AioContext *ctx, Error **errp); + /* Return the LinuxAioState bound to this AioContext */ struct LinuxAioState *aio_get_linux_aio(AioContext *ctx); diff --git a/include/block/raw-aio.h b/include/block/raw-aio.h index 0e717fd475..8d698ccd31 100644 --- a/include/block/raw-aio.h +++ b/include/block/raw-aio.h @@ -43,7 +43,7 @@ /* linux-aio.c - Linux native implementation */ #ifdef CONFIG_LINUX_AIO typedef struct LinuxAioState LinuxAioState; -LinuxAioState *laio_init(void); +LinuxAioState *laio_init(Error **errp); void laio_cleanup(LinuxAioState *s); int coroutine_fn laio_co_submit(BlockDriverState *bs, LinuxAioState *s, int fd, uint64_t offset, QEMUIOVector *qiov, int type); diff --git a/block/file-posix.c b/block/file-posix.c index 07bb061fe4..43b963b13e 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -545,11 +545,17 @@ static int raw_open_common(BlockDriverState *bs, QDict *options, #ifdef CONFIG_LINUX_AIO /* Currently Linux does AIO only for files opened with O_DIRECT */ - if (s->use_linux_aio && !(s->open_flags & O_DIRECT)) { - error_setg(errp, "aio=native was specified, but it requires " - "cache.direct=on, which was not specified."); - ret = -EINVAL; - goto fail; + if (s->use_linux_aio) { + if (!(s->open_flags & O_DIRECT)) { + error_setg(errp, "aio=native was specified, but it requires " + "cache.direct=on, which was not specified."); + ret = -EINVAL; + goto fail; + } + if (!aio_setup_linux_aio(bdrv_get_aio_context(bs), errp)) { + error_prepend(errp, "Unable to use native AIO: "); + goto fail; + } } #else if (s->use_linux_aio) { @@ -1723,6 +1729,22 @@ static BlockAIOCB *raw_aio_flush(BlockDriverState *bs, return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH); } +static void raw_aio_attach_aio_context(BlockDriverState *bs, + AioContext *new_context) +{ +#ifdef CONFIG_LINUX_AIO + BDRVRawState *s = bs->opaque; + if (s->use_linux_aio) { + Error *local_err; + if (!aio_setup_linux_aio(new_context, &local_err)) { + error_reportf_err(local_err, "Unable to use native AIO, " + "falling back to thread pool: "); + s->use_linux_aio = false; + } + } +#endif +} + static void raw_close(BlockDriverState *bs) { BDRVRawState *s = bs->opaque; @@ -2601,6 +2623,7 @@ BlockDriver bdrv_file = { .bdrv_refresh_limits = raw_refresh_limits, .bdrv_io_plug = raw_aio_plug, .bdrv_io_unplug = raw_aio_unplug, + .bdrv_attach_aio_context = raw_aio_attach_aio_context, .bdrv_truncate = raw_truncate, .bdrv_getlength = raw_getlength, diff --git a/block/linux-aio.c b/block/linux-aio.c index 88b8d55ec7..19eb922fdd 100644 --- a/block/linux-aio.c +++ b/block/linux-aio.c @@ -15,6 +15,7 @@ #include "block/raw-aio.h" #include "qemu/event_notifier.h" #include "qemu/coroutine.h" +#include "qapi/error.h" #include @@ -470,16 +471,21 @@ void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context) qemu_laio_poll_cb); } -LinuxAioState *laio_init(void) +LinuxAioState *laio_init(Error **errp) { + int rc; LinuxAioState *s; s = g_malloc0(sizeof(*s)); - if (event_notifier_init(&s->e, false) < 0) { + rc = event_notifier_init(&s->e, false); + if (rc < 0) { + error_setg_errno(errp, -rc, "failed to to initialize event notifier"); goto out_free_state; } - if (io_setup(MAX_EVENTS, &s->ctx) != 0) { + rc = io_setup(MAX_EVENTS, &s->ctx); + if (rc < 0) { + error_setg_errno(errp, -rc, "failed to create linux AIO context"); goto out_close_efd; } diff --git a/stubs/linux-aio.c b/stubs/linux-aio.c index ed47bd443c..84d1f784ae 100644 --- a/stubs/linux-aio.c +++ b/stubs/linux-aio.c @@ -21,7 +21,7 @@ void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context) abort(); } -LinuxAioState *laio_init(void) +LinuxAioState *laio_init(Error **errp) { abort(); } diff --git a/util/async.c b/util/async.c index 03f62787f2..05979f8014 100644 --- a/util/async.c +++ b/util/async.c @@ -323,14 +323,22 @@ ThreadPool *aio_get_thread_pool(AioContext *ctx) } #ifdef CONFIG_LINUX_AIO -LinuxAioState *aio_get_linux_aio(AioContext *ctx) +LinuxAioState *aio_setup_linux_aio(AioContext *ctx, Error **errp) { if (!ctx->linux_aio) { - ctx->linux_aio = laio_init(); - laio_attach_aio_context(ctx->linux_aio, ctx); + ctx->linux_aio = laio_init(errp); + if (ctx->linux_aio) { + laio_attach_aio_context(ctx->linux_aio, ctx); + } } return ctx->linux_aio; } + +LinuxAioState *aio_get_linux_aio(AioContext *ctx) +{ + assert(ctx->linux_aio); + return ctx->linux_aio; +} #endif void aio_notify(AioContext *ctx) -- 2.17.1