open() can also return EPERM for O_RDWR on a readonly device

[qemu] / block.c

diff --git a/block.c b/block.c
index 3eb4526..5d708ba 100644 (file)
--- a/block.c
+++ b/block.c
@@ -399,7 +399,7 @@ int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
     else
         open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
     ret = drv->bdrv_open(bs, filename, open_flags);
-    if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
+    if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
         ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
         bs->read_only = 1;
     }