From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:54728) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Zvv6i-0003Ez-2j for qemu-devel@nongnu.org; Mon, 09 Nov 2015 17:40:13 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Zvv6h-0004y8-1X for qemu-devel@nongnu.org; Mon, 09 Nov 2015 17:40:11 -0500 From: Max Reitz Date: Mon, 9 Nov 2015 23:39:20 +0100 Message-Id: <1447108773-6836-12-git-send-email-mreitz@redhat.com> In-Reply-To: <1447108773-6836-1-git-send-email-mreitz@redhat.com> References: <1447108773-6836-1-git-send-email-mreitz@redhat.com> Subject: [Qemu-devel] [PATCH v7 11/24] block: Add BB-BDS remove/insert notifiers List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org Cc: Kevin Wolf , Alberto Garcia , John Snow , Markus Armbruster , qemu-devel@nongnu.org, Stefan Hajnoczi , Paolo Bonzini , Max Reitz bdrv_close() no longer signifies ejection of a medium, this is now done by removing the BDS from the BB. Therefore, we want to have a notifier for that in the BB instead of a close notifier in the BDS. The former is added now, the latter is removed later. Symmetrically, another notifier list is added that is invoked whenever a BDS is inserted. We will need that for virtio-blk and virtio-scsi, which can then remove their op blockers on BDS ejection and set them up on insertion. Signed-off-by: Max Reitz --- block/block-backend.c | 20 ++++++++++++++++++++ include/sysemu/block-backend.h | 2 ++ 2 files changed, 22 insertions(+) diff --git a/block/block-backend.c b/block/block-backend.c index 6f9309f..8f74a54 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -48,6 +48,8 @@ struct BlockBackend { BlockdevOnError on_read_error, on_write_error; bool iostatus_enabled; BlockDeviceIoStatus iostatus; + + NotifierList remove_bs_notifiers, insert_bs_notifiers; }; typedef struct BlockBackendAIOCB { @@ -98,6 +100,8 @@ BlockBackend *blk_new(const char *name, Error **errp) blk = g_new0(BlockBackend, 1); blk->name = g_strdup(name); blk->refcnt = 1; + notifier_list_init(&blk->remove_bs_notifiers); + notifier_list_init(&blk->insert_bs_notifiers); QTAILQ_INSERT_TAIL(&blk_backends, blk, link); return blk; } @@ -166,6 +170,8 @@ static void blk_delete(BlockBackend *blk) bdrv_unref(blk->bs); blk->bs = NULL; } + assert(QLIST_EMPTY(&blk->remove_bs_notifiers.notifiers)); + assert(QLIST_EMPTY(&blk->insert_bs_notifiers.notifiers)); if (blk->root_state.throttle_state) { g_free(blk->root_state.throttle_group); throttle_group_unref(blk->root_state.throttle_state); @@ -343,6 +349,8 @@ void blk_hide_on_behalf_of_hmp_drive_del(BlockBackend *blk) */ void blk_remove_bs(BlockBackend *blk) { + notifier_list_notify(&blk->remove_bs_notifiers, blk); + blk_update_root_state(blk); blk->bs->blk = NULL; @@ -359,6 +367,8 @@ void blk_insert_bs(BlockBackend *blk, BlockDriverState *bs) bdrv_ref(bs); blk->bs = bs; bs->blk = blk; + + notifier_list_notify(&blk->insert_bs_notifiers, blk); } /* @@ -1105,6 +1115,16 @@ void blk_remove_aio_context_notifier(BlockBackend *blk, } } +void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify) +{ + notifier_list_add(&blk->remove_bs_notifiers, notify); +} + +void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify) +{ + notifier_list_add(&blk->insert_bs_notifiers, notify); +} + void blk_add_close_notifier(BlockBackend *blk, Notifier *notify) { if (blk->bs) { diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h index f4a68e2..632cdc0 100644 --- a/include/sysemu/block-backend.h +++ b/include/sysemu/block-backend.h @@ -162,6 +162,8 @@ void blk_remove_aio_context_notifier(BlockBackend *blk, void *), void (*detach_aio_context)(void *), void *opaque); +void blk_add_remove_bs_notifier(BlockBackend *blk, Notifier *notify); +void blk_add_insert_bs_notifier(BlockBackend *blk, Notifier *notify); void blk_add_close_notifier(BlockBackend *blk, Notifier *notify); void blk_io_plug(BlockBackend *blk); void blk_io_unplug(BlockBackend *blk); -- 2.6.2