From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([209.51.188.92]:43106) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gteLb-0000WW-9x for qemu-devel@nongnu.org; Tue, 12 Feb 2019 15:08:07 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gteLZ-00079q-EG for qemu-devel@nongnu.org; Tue, 12 Feb 2019 15:08:03 -0500 From: John Snow Date: Tue, 12 Feb 2019 15:07:50 -0500 Message-Id: <20190212200750.27521-1-jsnow@redhat.com> Subject: [Qemu-devel] [PATCH v2] blockdev: acquire aio_context for bitmap add/remove List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-block@nongnu.org, qemu-devel@nongnu.org Cc: Kevin Wolf , vsementsov@virtuozzo.com, Max Reitz , pbonzini@redhat.com, eblake@redhat.com, Markus Armbruster , John Snow When bitmaps are persistent, they may incur a disk read or write when bitmaps are added or removed. For configurations like virtio-dataplane, failing to acquire this lock will abort QEMU when disk IO occurs. We used to acquire aio_context as part of the bitmap lookup, so re-introduce the lock for just the cases that have an IO penalty. Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1672010 Reported-By: Aihua Liang --- blockdev.c | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) diff --git a/blockdev.c b/blockdev.c index fb18e9c975..790b0e0ac8 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2820,6 +2820,7 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name, { BlockDriverState *bs; BdrvDirtyBitmap *bitmap; + AioContext *aio_context = NULL; if (!name || name[0] == '\0') { error_setg(errp, "Bitmap name cannot be empty"); @@ -2854,15 +2855,17 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name, disabled = false; } - if (persistent && - !bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) - { - return; + if (persistent) { + aio_context = bdrv_get_aio_context(bs); + aio_context_acquire(aio_context); + if (!bdrv_can_store_new_dirty_bitmap(bs, name, granularity, errp)) { + goto out; + } } bitmap = bdrv_create_dirty_bitmap(bs, granularity, name, errp); if (bitmap == NULL) { - return; + goto out } if (disabled) { @@ -2870,6 +2873,10 @@ void qmp_block_dirty_bitmap_add(const char *node, const char *name, } bdrv_dirty_bitmap_set_persistance(bitmap, persistent); + out: + if (aio_context) { + aio_context_release(aio_context); + } } void qmp_block_dirty_bitmap_remove(const char *node, const char *name, @@ -2878,6 +2885,7 @@ void qmp_block_dirty_bitmap_remove(const char *node, const char *name, BlockDriverState *bs; BdrvDirtyBitmap *bitmap; Error *local_err = NULL; + AioContext *aio_context = NULL; bitmap = block_dirty_bitmap_lookup(node, name, &bs, errp); if (!bitmap || !bs) { @@ -2892,14 +2900,20 @@ void qmp_block_dirty_bitmap_remove(const char *node, const char *name, } if (bdrv_dirty_bitmap_get_persistance(bitmap)) { + aio_context = bdrv_get_aio_context(bs); + aio_context_acquire(aio_context); bdrv_remove_persistent_dirty_bitmap(bs, name, &local_err); if (local_err != NULL) { error_propagate(errp, local_err); - return; + goto out; } } bdrv_release_dirty_bitmap(bs, bitmap); + out: + if (aio_context) { + aio_context_release(aio_context); + } } /** -- 2.17.2