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block: add close notifiers

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The first user of close notifiers will be the embedded NBD server.
It would be possible to use them to do some of the ad hoc processing
(e.g. for block jobs and I/O limits) that is currently done by
bdrv_close.

Acked-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-08-23 11:20:36 +02:00
parent 3cbc002c34
commit d7d512f609
4 changed files with 14 additions and 2 deletions
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2
block_int.h
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@ -233,6 +233,8 @@ struct BlockDriverState {
BlockDriverState *backing_hd;
BlockDriverState *file;
NotifierList close_notifiers;
/* number of in-flight copy-on-read requests */
unsigned int copy_on_read_in_flight;