[Qemu-devel] [PATCH V4 1/3] block: Add bdrv_are_busy()

[benoit.canet@gmail.com]

From: Benoît Canet <benoit@irqsave.net>

bdrv_are_busy will be used to check if any of the bs are in use
or if one of them have a running block job.

The first user will be qmp_migrate().

Signed-off-by: Benoit Canet <benoit@irqsave.net>
---
 block.c |   13 +++++++++++++
 block.h |    2 ++
 2 files changed, 15 insertions(+)

diff --git a/block.c b/block.c
index ce7eb8f..bc8f160 100644
--- a/block.c
+++ b/block.c
@@ -4027,6 +4027,19 @@ out:
     return ret;
 }
 
+int bdrv_are_busy(void)
+{
+    BlockDriverState *bs;
+
+    QTAILQ_FOREACH(bs, &bdrv_states, list) {
+        if (bs->job || bdrv_in_use(bs)) {
+            return -EBUSY;
+        }
+    }
+
+    return 0;
+}
+
 void *block_job_create(const BlockJobType *job_type, BlockDriverState *bs,
                        int64_t speed, BlockDriverCompletionFunc *cb,
                        void *opaque, Error **errp)
diff --git a/block.h b/block.h
index c89590d..0a3de2f 100644
--- a/block.h
+++ b/block.h
@@ -337,6 +337,8 @@ void bdrv_disable_copy_on_read(BlockDriverState *bs);
 void bdrv_set_in_use(BlockDriverState *bs, int in_use);
 int bdrv_in_use(BlockDriverState *bs);
 
+int bdrv_are_busy(void);
+
 enum BlockAcctType {
     BDRV_ACCT_READ,
     BDRV_ACCT_WRITE,
-- 
1.7.9.5