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Thu, 13 Aug 2020 16:30:25 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-113-97.ams2.redhat.com [10.36.113.97]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3B8F65C1A3; Thu, 13 Aug 2020 16:30:24 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [RFC PATCH 20/22] block/export: Add block-export-del Date: Thu, 13 Aug 2020 18:29:33 +0200 Message-Id: <20200813162935.210070-21-kwolf@redhat.com> In-Reply-To: <20200813162935.210070-1-kwolf@redhat.com> References: <20200813162935.210070-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 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 = 2020/08/13 03:44:21 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-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_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, 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" Implement a new QMP command block-export-del and make nbd-server-remove a wrapper around it. Signed-off-by: Kevin Wolf --- qapi/block-export.json | 30 +++++++++++++++---- include/block/nbd.h | 1 - block/export/export.c | 54 ++++++++++++++++++++++++++++++++++ block/monitor/block-hmp-cmds.c | 2 +- blockdev-nbd.c | 28 ------------------ nbd/server.c | 14 --------- 6 files changed, 79 insertions(+), 50 deletions(-) diff --git a/qapi/block-export.json b/qapi/block-export.json index 0d0db9ca1b..a067de2ba3 100644 --- a/qapi/block-export.json +++ b/qapi/block-export.json @@ -111,9 +111,9 @@ 'data': 'NbdServerAddOptions', 'boxed': true } ## -# @NbdServerRemoveMode: +# @BlockExportRemoveMode: # -# Mode for removing an NBD export. +# Mode for removing a block export. # # @safe: Remove export if there are no existing connections, fail otherwise. # @@ -129,16 +129,16 @@ # # Since: 2.12 ## -{'enum': 'NbdServerRemoveMode', 'data': ['safe', 'hard']} +{'enum': 'BlockExportRemoveMode', 'data': ['safe', 'hard']} ## # @nbd-server-remove: # # Remove NBD export by name. # -# @name: Export name. +# @name: Block export id. # -# @mode: Mode of command operation. See @NbdServerRemoveMode description. +# @mode: Mode of command operation. See @BlockExportRemoveMode description. # Default is 'safe'. # # Returns: error if @@ -149,7 +149,7 @@ # Since: 2.12 ## { 'command': 'nbd-server-remove', - 'data': {'name': 'str', '*mode': 'NbdServerRemoveMode'} } + 'data': {'name': 'str', '*mode': 'BlockExportRemoveMode'} } ## # @nbd-server-stop: @@ -208,3 +208,21 @@ ## { 'command': 'block-export-add', 'data': 'BlockExportOptions', 'boxed': true } + +## +# @block-export-del: +# +# Remove a block export. +# +# @id: Block export id. +# +# @mode: Mode of command operation. See @BlockExportRemoveMode description. +# Default is 'safe'. +# +# Returns: Error if the export is not found or @mode is 'safe' and the export +# is still in use (e.g. by existing client connections) +# +# Since: 5.2 +## +{ 'command': 'block-export-del', + 'data': { 'id': 'str', '*mode': 'BlockExportRemoveMode' } } diff --git a/include/block/nbd.h b/include/block/nbd.h index 91a9d4f96d..7982a63f96 100644 --- a/include/block/nbd.h +++ b/include/block/nbd.h @@ -335,7 +335,6 @@ int nbd_export_new(BlockExport *blk_exp, BlockDriverState *bs, const char *bitmap, bool readonly, bool shared, bool writethrough, Error **errp); void nbd_export_set_on_eject_blk(BlockExport *exp, BlockBackend *blk); -void nbd_export_remove(NBDExport *exp, NbdServerRemoveMode mode, Error **errp); AioContext *nbd_export_aio_context(NBDExport *exp); NBDExport *nbd_export_find(const char *name); diff --git a/block/export/export.c b/block/export/export.c index f94a81258a..1255f3fc80 100644 --- a/block/export/export.c +++ b/block/export/export.c @@ -115,6 +115,15 @@ void blk_exp_request_shutdown(BlockExport *exp) { AioContext *aio_context = exp->ctx; + /* + * If the user doesn't own the export any more, it is already shutting + * down. We must not call .request_shutdown and decrease the refcount a + * second time. + */ + if (!exp->user_owned) { + return; + } + aio_context_acquire(aio_context); exp->drv->request_shutdown(exp); aio_context_release(aio_context); @@ -215,3 +224,48 @@ void qmp_nbd_server_add(NbdServerAddOptions *arg, Error **errp) fail: qapi_free_BlockExportOptions(export_opts); } + +void qmp_block_export_del(const char *id, + bool has_mode, BlockExportRemoveMode mode, + Error **errp) +{ + ERRP_GUARD(); + BlockExport *exp; + + exp = blk_exp_find(id); + if (exp == NULL) { + error_setg(errp, "Export '%s' is not found", id); + return; + } + if (!exp->user_owned) { + error_setg(errp, "Export '%s' is already shutting down", id); + return; + } + + if (!has_mode) { + mode = BLOCK_EXPORT_REMOVE_MODE_SAFE; + } + if (mode == BLOCK_EXPORT_REMOVE_MODE_SAFE && exp->refcount > 1) { + error_setg(errp, "export '%s' still in use", exp->id); + error_append_hint(errp, "Use mode='hard' to force client " + "disconnect\n"); + return; + } + + blk_exp_request_shutdown(exp); +} + +void qmp_nbd_server_remove(const char *name, + bool has_mode, BlockExportRemoveMode mode, + Error **errp) +{ + BlockExport *exp; + + exp = blk_exp_find(name); + if (exp && exp->drv->type != BLOCK_EXPORT_TYPE_NBD) { + error_setg(errp, "Block export '%s' is not an NBD export", name); + return; + } + + qmp_block_export_del(name, has_mode, mode, errp); +} diff --git a/block/monitor/block-hmp-cmds.c b/block/monitor/block-hmp-cmds.c index 6c823234a9..10165252cf 100644 --- a/block/monitor/block-hmp-cmds.c +++ b/block/monitor/block-hmp-cmds.c @@ -477,7 +477,7 @@ void hmp_nbd_server_remove(Monitor *mon, const QDict *qdict) Error *err = NULL; /* Rely on NBD_SERVER_REMOVE_MODE_SAFE being the default */ - qmp_nbd_server_remove(name, force, NBD_SERVER_REMOVE_MODE_HARD, &err); + qmp_nbd_server_remove(name, force, BLOCK_EXPORT_REMOVE_MODE_HARD, &err); hmp_handle_error(mon, err); } diff --git a/blockdev-nbd.c b/blockdev-nbd.c index 40013b7d64..5ec21045a8 100644 --- a/blockdev-nbd.c +++ b/blockdev-nbd.c @@ -237,34 +237,6 @@ int nbd_export_create(BlockExport *exp, BlockExportOptions *exp_args, return ret; } -void qmp_nbd_server_remove(const char *name, - bool has_mode, NbdServerRemoveMode mode, - Error **errp) -{ - NBDExport *exp; - AioContext *aio_context; - - if (!nbd_server) { - error_setg(errp, "NBD server not running"); - return; - } - - exp = nbd_export_find(name); - if (exp == NULL) { - error_setg(errp, "Export '%s' is not found", name); - return; - } - - if (!has_mode) { - mode = NBD_SERVER_REMOVE_MODE_SAFE; - } - - aio_context = nbd_export_aio_context(exp); - aio_context_acquire(aio_context); - nbd_export_remove(exp, mode, errp); - aio_context_release(aio_context); -} - void qmp_nbd_server_stop(Error **errp) { if (!nbd_server) { diff --git a/nbd/server.c b/nbd/server.c index e3ac7f548b..899d00782f 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -1669,20 +1669,6 @@ static void nbd_export_request_shutdown(BlockExport *blk_exp) blk_exp_unref(&exp->common); } -void nbd_export_remove(NBDExport *exp, NbdServerRemoveMode mode, Error **errp) -{ - ERRP_GUARD(); - if (mode == NBD_SERVER_REMOVE_MODE_HARD || QTAILQ_EMPTY(&exp->clients)) { - nbd_export_request_shutdown(&exp->common); - return; - } - - assert(mode == NBD_SERVER_REMOVE_MODE_SAFE); - - error_setg(errp, "export '%s' still in use", exp->name); - error_append_hint(errp, "Use mode='hard' to force client disconnect\n"); -} - static void nbd_export_delete(BlockExport *blk_exp) { NBDExport *exp = container_of(blk_exp, NBDExport, common);