[03/10] qdev-monitor: Add blk_by_qdev_id()
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Message ID 1471625435-6190-4-git-send-email-kwolf@redhat.com
State New
Headers show

Commit Message

Kevin Wolf Aug. 19, 2016, 4:50 p.m. UTC
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>
---
 include/sysemu/block-backend.h |  1 +
 qdev-monitor.c                 | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

Patch
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diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 410eb68..3b29317 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -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);
diff --git a/qdev-monitor.c b/qdev-monitor.c
index bc0213f..4f78ecb 100644
--- a/qdev-monitor.c
+++ b/qdev-monitor.c
@@ -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();