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qmp: add block-dirty-bitmap-clear

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Add bdrv_clear_dirty_bitmap and a matching QMP command,
qmp_block_dirty_bitmap_clear that enables a user to reset
the bitmap attached to a drive.

This allows us to reset a bitmap in the event of a full
drive backup.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1429314609-29776-12-git-send-email-jsnow@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
John Snow
2015-04-17 19:49:59 -04:00
committed by Kevin Wolf
parent d58d845397
commit e74e6b78e6
5 changed files with 86 additions and 0 deletions
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34
blockdev.c
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@@ -2079,6 +2079,40 @@ void qmp_block_dirty_bitmap_remove(const char *node, const char *name,
aio_context_release(aio_context);
}
/**
* Completely clear a bitmap, for the purposes of synchronizing a bitmap
* immediately after a full backup operation.
*/
void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
Error **errp)
{
AioContext *aio_context;
BdrvDirtyBitmap *bitmap;
BlockDriverState *bs;
bitmap = block_dirty_bitmap_lookup(node, name, &bs, &aio_context, errp);
if (!bitmap || !bs) {
return;
}
if (bdrv_dirty_bitmap_frozen(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently frozen and cannot be modified",
name);
goto out;
} else if (!bdrv_dirty_bitmap_enabled(bitmap)) {
error_setg(errp,
"Bitmap '%s' is currently disabled and cannot be cleared",
name);
goto out;
}
bdrv_clear_dirty_bitmap(bitmap);
out:
aio_context_release(aio_context);
}
int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
const char *id = qdict_get_str(qdict, "id");