[Qemu-devel] [PATCH v5 11/13] block: Add blk_remove_all_bs()

[Max Reitz <mreitz@redhat.com>]

When bdrv_close_all() is called, instead of force-closing all root
BlockDriverStates, it is better to just drop the reference from all
BlockBackends and let them be closed automatically. This prevents BDS
from getting closed that are still referenced by other BDS, which may
result in loss of cached data.

This patch adds a function for doing that, but does not yet incorporate
it in bdrv_close_all().

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 block/block-backend.c          | 13 +++++++++++++
 include/sysemu/block-backend.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/block/block-backend.c b/block/block-backend.c
index 76e6893..8eedc52 100644
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -207,6 +207,19 @@ void blk_unref(BlockBackend *blk)
     }
 }
 
+void blk_remove_all_bs(void)
+{
+    BlockBackend *blk;
+
+    QTAILQ_FOREACH(blk, &blk_backends, link) {
+        AioContext *ctx = blk_get_aio_context(blk);
+
+        aio_context_acquire(ctx);
+        blk_remove_bs(blk);
+        aio_context_release(ctx);
+    }
+}
+
 /*
  * Return the BlockBackend after @blk.
  * If @blk is null, return the first one.
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 3725e20..71f5292 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -67,6 +67,7 @@ BlockBackend *blk_new_open(const char *name, const char *filename,
                            Error **errp);
 void blk_ref(BlockBackend *blk);
 void blk_unref(BlockBackend *blk);
+void blk_remove_all_bs(void);
 const char *blk_name(BlockBackend *blk);
 BlockBackend *blk_by_name(const char *name);
 BlockBackend *blk_next(BlockBackend *blk);
-- 
2.1.0