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bh=cYGUfY/8W0kyk7F4Li7fh3C0adXcFjdLOY41WJvxzR4=; b=aCJ0oGIZx+Uw2jybclMDDRTOlmvrsPgr674ONhZWqwvzH9sXs0tlIDwJxjyCg5xOGPnYMa CUL8ZV0KEaykT7L1dVqNLWPnfIsa4T4H82HwLiAdmldVCdyQPhKfsGnZqq1n/LIdfnRfib fWL/i71uZuR3HdwWDeGPfjB8zSBSPYo= X-MC-Unique: 7Dfbd1WLMEORMzlZO9z2vw-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, qemu-devel@nongnu.org Subject: [PULL 04/33] block/file-posix: set up Linux AIO and io_uring in the current thread Date: Thu, 21 Dec 2023 22:23:09 +0100 Message-ID: <20231221212339.164439-5-kwolf@redhat.com> In-Reply-To: <20231221212339.164439-1-kwolf@redhat.com> References: <20231221212339.164439-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.8 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.061, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1703193880216100003 Content-Type: text/plain; charset="utf-8" From: Stefan Hajnoczi The file-posix block driver currently only sets up Linux AIO and io_uring in the BDS's AioContext. In the multi-queue block layer we must be able to submit I/O requests in AioContexts that do not have Linux AIO and io_uring set up yet since any thread can call into the block driver. Set up Linux AIO and io_uring for the current AioContext during request submission. We lose the ability to return an error from .bdrv_file_open() when Linux AIO and io_uring setup fails (e.g. due to resource limits). Instead the user only gets warnings and we fall back to aio=3Dthreads. This is still better than a fatal error after startup. Signed-off-by: Stefan Hajnoczi Message-ID: <20230914140101.1065008-2-stefanha@redhat.com> Reviewed-by: Kevin Wolf Reviewed-by: Eric Blake Signed-off-by: Kevin Wolf --- block/file-posix.c | 99 ++++++++++++++++++++++------------------------ 1 file changed, 47 insertions(+), 52 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index b862406c71..0b9d4679c4 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -712,17 +712,11 @@ static int raw_open_common(BlockDriverState *bs, QDic= t *options, =20 #ifdef CONFIG_LINUX_AIO /* Currently Linux does AIO only for files opened with O_DIRECT */ - if (s->use_linux_aio) { - if (!(s->open_flags & O_DIRECT)) { - error_setg(errp, "aio=3Dnative was specified, but it requires " - "cache.direct=3Don, which was not specified."= ); - ret =3D -EINVAL; - goto fail; - } - if (!aio_setup_linux_aio(bdrv_get_aio_context(bs), errp)) { - error_prepend(errp, "Unable to use native AIO: "); - goto fail; - } + if (s->use_linux_aio && !(s->open_flags & O_DIRECT)) { + error_setg(errp, "aio=3Dnative was specified, but it requires " + "cache.direct=3Don, which was not specified."); + ret =3D -EINVAL; + goto fail; } #else if (s->use_linux_aio) { @@ -733,14 +727,7 @@ static int raw_open_common(BlockDriverState *bs, QDict= *options, } #endif /* !defined(CONFIG_LINUX_AIO) */ =20 -#ifdef CONFIG_LINUX_IO_URING - if (s->use_linux_io_uring) { - if (!aio_setup_linux_io_uring(bdrv_get_aio_context(bs), errp)) { - error_prepend(errp, "Unable to use io_uring: "); - goto fail; - } - } -#else +#ifndef CONFIG_LINUX_IO_URING if (s->use_linux_io_uring) { error_setg(errp, "aio=3Dio_uring was specified, but is not support= ed " "in this build."); @@ -2444,6 +2431,44 @@ static bool bdrv_qiov_is_aligned(BlockDriverState *b= s, QEMUIOVector *qiov) return true; } =20 +static inline bool raw_check_linux_io_uring(BDRVRawState *s) +{ + Error *local_err =3D NULL; + AioContext *ctx; + + if (!s->use_linux_io_uring) { + return false; + } + + ctx =3D qemu_get_current_aio_context(); + if (unlikely(!aio_setup_linux_io_uring(ctx, &local_err))) { + error_reportf_err(local_err, "Unable to use linux io_uring, " + "falling back to thread pool: "); + s->use_linux_io_uring =3D false; + return false; + } + return true; +} + +static inline bool raw_check_linux_aio(BDRVRawState *s) +{ + Error *local_err =3D NULL; + AioContext *ctx; + + if (!s->use_linux_aio) { + return false; + } + + ctx =3D qemu_get_current_aio_context(); + if (unlikely(!aio_setup_linux_aio(ctx, &local_err))) { + error_reportf_err(local_err, "Unable to use Linux AIO, " + "falling back to thread pool: "); + s->use_linux_aio =3D false; + return false; + } + return true; +} + static int coroutine_fn raw_co_prw(BlockDriverState *bs, int64_t *offset_p= tr, uint64_t bytes, QEMUIOVector *qiov, int= type) { @@ -2474,13 +2499,13 @@ static int coroutine_fn raw_co_prw(BlockDriverState= *bs, int64_t *offset_ptr, if (s->needs_alignment && !bdrv_qiov_is_aligned(bs, qiov)) { type |=3D QEMU_AIO_MISALIGNED; #ifdef CONFIG_LINUX_IO_URING - } else if (s->use_linux_io_uring) { + } else if (raw_check_linux_io_uring(s)) { assert(qiov->size =3D=3D bytes); ret =3D luring_co_submit(bs, s->fd, offset, qiov, type); goto out; #endif #ifdef CONFIG_LINUX_AIO - } else if (s->use_linux_aio) { + } else if (raw_check_linux_aio(s)) { assert(qiov->size =3D=3D bytes); ret =3D laio_co_submit(s->fd, offset, qiov, type, s->aio_max_batch); @@ -2567,39 +2592,13 @@ static int coroutine_fn raw_co_flush_to_disk(BlockD= riverState *bs) }; =20 #ifdef CONFIG_LINUX_IO_URING - if (s->use_linux_io_uring) { + if (raw_check_linux_io_uring(s)) { return luring_co_submit(bs, s->fd, 0, NULL, QEMU_AIO_FLUSH); } #endif return raw_thread_pool_submit(handle_aiocb_flush, &acb); } =20 -static void raw_aio_attach_aio_context(BlockDriverState *bs, - AioContext *new_context) -{ - BDRVRawState __attribute__((unused)) *s =3D bs->opaque; -#ifdef CONFIG_LINUX_AIO - if (s->use_linux_aio) { - Error *local_err =3D NULL; - 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 =3D false; - } - } -#endif -#ifdef CONFIG_LINUX_IO_URING - if (s->use_linux_io_uring) { - Error *local_err =3D NULL; - if (!aio_setup_linux_io_uring(new_context, &local_err)) { - error_reportf_err(local_err, "Unable to use linux io_uring, " - "falling back to thread pool: "); - s->use_linux_io_uring =3D false; - } - } -#endif -} - static void raw_close(BlockDriverState *bs) { BDRVRawState *s =3D bs->opaque; @@ -3896,7 +3895,6 @@ BlockDriver bdrv_file =3D { .bdrv_co_copy_range_from =3D raw_co_copy_range_from, .bdrv_co_copy_range_to =3D raw_co_copy_range_to, .bdrv_refresh_limits =3D raw_refresh_limits, - .bdrv_attach_aio_context =3D raw_aio_attach_aio_context, =20 .bdrv_co_truncate =3D raw_co_truncate, .bdrv_co_getlength =3D raw_co_getlength, @@ -4266,7 +4264,6 @@ static BlockDriver bdrv_host_device =3D { .bdrv_co_copy_range_from =3D raw_co_copy_range_from, .bdrv_co_copy_range_to =3D raw_co_copy_range_to, .bdrv_refresh_limits =3D raw_refresh_limits, - .bdrv_attach_aio_context =3D raw_aio_attach_aio_context, =20 .bdrv_co_truncate =3D raw_co_truncate, .bdrv_co_getlength =3D raw_co_getlength, @@ -4402,7 +4399,6 @@ static BlockDriver bdrv_host_cdrom =3D { .bdrv_co_pwritev =3D raw_co_pwritev, .bdrv_co_flush_to_disk =3D raw_co_flush_to_disk, .bdrv_refresh_limits =3D cdrom_refresh_limits, - .bdrv_attach_aio_context =3D raw_aio_attach_aio_context, =20 .bdrv_co_truncate =3D raw_co_truncate, .bdrv_co_getlength =3D raw_co_getlength, @@ -4528,7 +4524,6 @@ static BlockDriver bdrv_host_cdrom =3D { .bdrv_co_pwritev =3D raw_co_pwritev, .bdrv_co_flush_to_disk =3D raw_co_flush_to_disk, .bdrv_refresh_limits =3D cdrom_refresh_limits, - .bdrv_attach_aio_context =3D raw_aio_attach_aio_context, =20 .bdrv_co_truncate =3D raw_co_truncate, .bdrv_co_getlength =3D raw_co_getlength, --=20 2.43.0