block: Add blk_is_available()

blk_is_available() returns true iff the BDS is inserted (which means
blk_bs() is not NULL and bdrv_is_inserted() returns true) and if the
tray of the guest device is closed.

blk_is_inserted() is changed to return true only if blk_bs() is not
NULL.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/block/block-backend.c b/block/block-backend.c
index 1db002c00c8a89d40dd189d2bb936ab0732ce318..74642dc09754d09eac0121d30d43a650a60e7327 100644 (file)
--- a/block/block-backend.c
+++ b/block/block-backend.c
@@ -771,7 +771,12 @@ void blk_invalidate_cache(BlockBackend *blk, Error **errp)
 
 bool blk_is_inserted(BlockBackend *blk)
 {
-    return bdrv_is_inserted(blk->bs);
+    return blk->bs && bdrv_is_inserted(blk->bs);
+}
+
+bool blk_is_available(BlockBackend *blk)
+{
+    return blk_is_inserted(blk) && !blk_dev_is_tray_open(blk);
 }
 
 void blk_lock_medium(BlockBackend *blk, bool locked)

diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 8f2bf10f4dea52358b2078d581ac8cfa6dc5e72c..1e19d1bb7936f30787fc178261c177e6ffd664ed 100644 (file)
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -131,6 +131,7 @@ int blk_enable_write_cache(BlockBackend *blk);
 void blk_set_enable_write_cache(BlockBackend *blk, bool wce);
 void blk_invalidate_cache(BlockBackend *blk, Error **errp);
 bool blk_is_inserted(BlockBackend *blk);
+bool blk_is_available(BlockBackend *blk);
 void blk_lock_medium(BlockBackend *blk, bool locked);
 void blk_eject(BlockBackend *blk, bool eject_flag);
 int blk_get_flags(BlockBackend *blk);