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Mon, 7 Sep 2020 18:20:34 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-114-154.ams2.redhat.com [10.36.114.154]) by smtp.corp.redhat.com (Postfix) with ESMTP id 81B5760BF3; Mon, 7 Sep 2020 18:20:33 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PATCH 07/29] block/export: Remove magic from block-export-add Date: Mon, 7 Sep 2020 20:19:49 +0200 Message-Id: <20200907182011.521007-8-kwolf@redhat.com> In-Reply-To: <20200907182011.521007-1-kwolf@redhat.com> References: <20200907182011.521007-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kwolf@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.120; envelope-from=kwolf@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/07 03:19:10 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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=-0.1, 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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" nbd-server-add tries to be convenient and adds two questionable features that we don't want to share in block-export-add, even for NBD exports: 1. When requesting a writable export of a read-only device, the export is silently downgraded to read-only. This should be an error in the context of block-export-add. 2. When using a BlockBackend name, unplugging the device from the guest will automatically stop the NBD server, too. This may sometimes be what you want, but it could also be very surprising. Let's keep things explicit with block-export-add. If the user wants to stop the export, they should tell us so. Move these things into the nbd-server-add QMP command handler so that they apply only there. Signed-off-by: Kevin Wolf --- include/block/export.h | 2 ++ include/block/nbd.h | 3 ++- block/export/export.c | 13 +++++++++--- blockdev-nbd.c | 47 +++++++++++++++++++++++++++++++++++------- nbd/server.c | 20 +++++++++++------- qemu-nbd.c | 3 +-- 6 files changed, 67 insertions(+), 21 deletions(-) diff --git a/include/block/export.h b/include/block/export.h index 42e3c055fc..e7af2c7687 100644 --- a/include/block/export.h +++ b/include/block/export.h @@ -30,4 +30,6 @@ struct BlockExport { const BlockExportDriver *drv; }; +BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp); + #endif diff --git a/include/block/nbd.h b/include/block/nbd.h index 451f399b0a..f55f5b710b 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -335,7 +335,8 @@ NBDExport *nbd_export_new(BlockDriverState *bs, const char *name, const char *desc, const char *bitmap, bool readonly, bool shared, void (*close)(NBDExport *), bool writethrough, - BlockBackend *on_eject_blk, Error **errp); + Error **errp); +void nbd_export_set_on_eject_blk(BlockExport *exp, BlockBackend *blk); void nbd_export_close(NBDExport *exp); void nbd_export_remove(NBDExport *exp, NbdServerRemoveMode mode, Error **errp); void nbd_export_get(NBDExport *exp); diff --git a/block/export/export.c b/block/export/export.c index fd65541963..05bc5e3744 100644 --- a/block/export/export.c +++ b/block/export/export.c @@ -13,6 +13,8 @@ #include "qemu/osdep.h" +#include "block/block.h" +#include "sysemu/block-backend.h" #include "block/export.h" #include "block/nbd.h" #include "qapi/error.h" @@ -34,15 +36,20 @@ static const BlockExportDriver *blk_exp_find_driver(BlockExportType type) return NULL; } -void qmp_block_export_add(BlockExportOptions *export, Error **errp) +BlockExport *blk_exp_add(BlockExportOptions *export, Error **errp) { const BlockExportDriver *drv; drv = blk_exp_find_driver(export->type); if (!drv) { error_setg(errp, "No driver found for the requested export type"); - return; + return NULL; } - drv->create(export, errp); + return drv->create(export, errp); +} + +void qmp_block_export_add(BlockExportOptions *export, Error **errp) +{ + blk_exp_add(export, errp); } diff --git a/blockdev-nbd.c b/blockdev-nbd.c index 96cb0100e9..7bcca105f9 100644 --- a/blockdev-nbd.c +++ b/blockdev-nbd.c @@ -152,7 +152,6 @@ BlockExport *nbd_export_create(BlockExportOptions *exp_args, Error **errp) { BlockExportOptionsNbd *arg = &exp_args->u.nbd; BlockDriverState *bs = NULL; - BlockBackend *on_eject_blk; NBDExport *exp = NULL; AioContext *aio_context; @@ -182,8 +181,6 @@ BlockExport *nbd_export_create(BlockExportOptions *exp_args, Error **errp) return NULL; } - on_eject_blk = blk_by_name(arg->device); - bs = bdrv_lookup_bs(arg->device, arg->device, errp); if (!bs) { return NULL; @@ -195,13 +192,14 @@ BlockExport *nbd_export_create(BlockExportOptions *exp_args, Error **errp) if (!arg->has_writable) { arg->writable = false; } - if (bdrv_is_read_only(bs)) { - arg->writable = false; + if (bdrv_is_read_only(bs) && arg->writable) { + error_setg(errp, "Cannot export read-only node as writable"); + goto out; } exp = nbd_export_new(bs, arg->name, arg->description, arg->bitmap, !arg->writable, !arg->writable, - NULL, false, on_eject_blk, errp); + NULL, false, errp); if (!exp) { goto out; } @@ -219,11 +217,44 @@ BlockExport *nbd_export_create(BlockExportOptions *exp_args, Error **errp) void qmp_nbd_server_add(BlockExportOptionsNbd *arg, Error **errp) { - BlockExportOptions export = { + BlockExport *export; + BlockDriverState *bs; + BlockBackend *on_eject_blk; + BlockExportOptions export_opts; + + bs = bdrv_lookup_bs(arg->device, arg->device, errp); + if (!bs) { + return; + } + + export_opts = (BlockExportOptions) { .type = BLOCK_EXPORT_TYPE_NBD, .u.nbd = *arg, }; - qmp_block_export_add(&export, errp); + + /* + * nbd-server-add doesn't complain when a read-only device should be + * exported as writable, but simply downgrades it. This is an error with + * block-export-add. + */ + if (bdrv_is_read_only(bs)) { + export_opts.u.nbd.has_writable = true; + export_opts.u.nbd.writable = false; + } + + export = blk_exp_add(&export_opts, errp); + if (!export) { + return; + } + + /* + * nbd-server-add removes the export when the named BlockBackend used for + * @device goes away. + */ + on_eject_blk = blk_by_name(arg->device); + if (on_eject_blk) { + nbd_export_set_on_eject_blk(export, on_eject_blk); + } } void qmp_nbd_server_remove(const char *name, diff --git a/nbd/server.c b/nbd/server.c index 33aaca918c..23d9a53094 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1506,11 +1506,23 @@ static void nbd_eject_notifier(Notifier *n, void *data) aio_context_release(aio_context); } +void nbd_export_set_on_eject_blk(BlockExport *exp, BlockBackend *blk) +{ + NBDExport *nbd_exp = container_of(exp, NBDExport, common); + assert(exp->drv == &blk_exp_nbd); + assert(nbd_exp->eject_notifier_blk == NULL); + + blk_ref(blk); + nbd_exp->eject_notifier_blk = blk; + nbd_exp->eject_notifier.notify = nbd_eject_notifier; + blk_add_remove_bs_notifier(blk, &nbd_exp->eject_notifier); +} + NBDExport *nbd_export_new(BlockDriverState *bs, const char *name, const char *desc, const char *bitmap, bool readonly, bool shared, void (*close)(NBDExport *), bool writethrough, - BlockBackend *on_eject_blk, Error **errp) + Error **errp) { AioContext *ctx; BlockBackend *blk; @@ -1617,12 +1629,6 @@ NBDExport *nbd_export_new(BlockDriverState *bs, exp->ctx = ctx; blk_add_aio_context_notifier(blk, blk_aio_attached, blk_aio_detach, exp); - if (on_eject_blk) { - blk_ref(on_eject_blk); - exp->eject_notifier_blk = on_eject_blk; - exp->eject_notifier.notify = nbd_eject_notifier; - blk_add_remove_bs_notifier(on_eject_blk, &exp->eject_notifier); - } QTAILQ_INSERT_TAIL(&exports, exp, next); nbd_export_get(exp); return exp; diff --git a/qemu-nbd.c b/qemu-nbd.c index 1752daa4c4..2bba6c0db3 100644 --- a/qemu-nbd.c +++ b/qemu-nbd.c @@ -1067,8 +1067,7 @@ int main(int argc, char **argv) export = nbd_export_new(bs, export_name, export_description, bitmap, readonly, shared > 1, - nbd_export_closed, writethrough, NULL, - &error_fatal); + nbd_export_closed, writethrough, &error_fatal); if (device) { #if HAVE_NBD_DEVICE