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qdev-monitor: Add blk_by_qdev_id() 

This finds the BlockBackend attached to the device model identified by
its qdev ID.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2016-09-20 13:38:42 +02:00
parent 6c1db528b0
commit 9680caee0f
2 changed files with 19 additions and 0 deletions
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1
include/sysemu/block-backend.h
View File

@ -112,6 +112,7 @@ void blk_attach_dev_nofail(BlockBackend *blk, void *dev);
void blk_detach_dev(BlockBackend *blk, void *dev);
void *blk_get_attached_dev(BlockBackend *blk);
BlockBackend *blk_by_dev(void *dev);
BlockBackend *blk_by_qdev_id(const char *id, Error **errp);
void blk_set_dev_ops(BlockBackend *blk, const BlockDevOps *ops, void *opaque);
int blk_pread_unthrottled(BlockBackend *blk, int64_t offset, uint8_t *buf,
int count);

18
qdev-monitor.c
View File

@ -28,6 +28,7 @@
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/help_option.h"
#include "sysemu/block-backend.h"
/*
* Aliases were a bad idea from the start. Let's keep them
@ -838,6 +839,23 @@ void qmp_device_del(const char *id, Error **errp)
}
}
BlockBackend *blk_by_qdev_id(const char *id, Error **errp)
{
DeviceState *dev;
BlockBackend *blk;
dev = find_device_state(id, errp);
if (dev == NULL) {
return NULL;
}
blk = blk_by_dev(dev);
if (!blk) {
error_setg(errp, "Device does not have a block device backend");
}
return blk;
}
void qdev_machine_init(void)
{
qdev_get_peripheral_anon();