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authorStefan Hajnoczi <stefanha@redhat.com>2018-03-06 20:48:18 +0000
committerEric Blake <eblake@redhat.com>2018-03-13 15:38:55 -0500
commitd03654eacdf35f436fbe78ca46cea215d5165ab5 (patch)
tree0641a1398fb1b43f9a2e54fbbef07d6080d56568 /qemu-io-cmds.c
parent65529782f8fec531fd114cc0f58399e88202153c (diff)
block: let blk_add/remove_aio_context_notifier() tolerate BDS changes
Commit 2019ba0a0197 ("block: Add AioContextNotifier functions to BB") added blk_add/remove_aio_context_notifier() and implemented them by passing through the bdrv_*() equivalent. This doesn't work across bdrv_append(), which detaches child->bs and re-attaches it to a new BlockDriverState. When blk_remove_aio_context_notifier() is called we will access the new BDS instead of the one where the notifier was added! >From the point of view of the blk_*() API user, changes to the root BDS should be transparent. This patch maintains a list of AioContext notifiers in BlockBackend and adds/removes them from the BlockDriverState as needed. Reported-by: Stefano Panella <spanella@gmail.com> Cc: Max Reitz <mreitz@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-Id: <20180306204819.11266-2-stefanha@redhat.com> Reviewed-by: Max Reitz <mreitz@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
Diffstat (limited to 'qemu-io-cmds.c')
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