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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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9
block.c
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@ -30,6 +30,7 @@
#include "module.h"
#include "qjson.h"
#include "sysemu.h"
#include "notify.h"
#include "qemu-coroutine.h"
#include "qmp-commands.h"
#include "qemu-timer.h"
@ -312,9 +313,16 @@ BlockDriverState *bdrv_new(const char *device_name)
QTAILQ_INSERT_TAIL(&bdrv_states, bs, list);
}
bdrv_iostatus_disable(bs);
notifier_list_init(&bs->close_notifiers);
return bs;
}
void bdrv_add_close_notifier(BlockDriverState *bs, Notifier *notify)
{
notifier_list_add(&bs->close_notifiers, notify);
}
BlockDriver *bdrv_find_format(const char *format_name)
{
BlockDriver *drv1;
@ -1102,6 +1110,7 @@ void bdrv_close(BlockDriverState *bs)
block_job_cancel_sync(bs->job);
}
bdrv_drain_all();
notifier_list_notify(&bs->close_notifiers, bs);
if (bs->drv) {
if (bs == bs_snapshots) {