recently (probably since the AIO code went in) qemu opens the cdrom device like
this:
open("/dev/cdrom", O_RDWR|O_LARGEFILE) = -1 EROFS (Read-only file system)
which obviously fails and qemu quits w/ an error message about being unable to
access the cdrom.
Patch below makes a RO -cdrom device work (but doesn't necessarily address the
real bug - should qemu really be opening cdrom devices for rw?)
artur
diff -urNp qemu.org/block.c qemu/block.c
--- qemu.org/block.c 2006-08-07 21:36:12.000000000 +0000
+++ qemu/block.c 2006-08-08 13:05:01.000000000 +0000
@@ -332,7 +332,7 @@ int bdrv_open2(BlockDriverState *bs, con
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 == -EROFS) && !(flags & BDRV_O_FILE)) {
ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
bs->read_only = 1;
}
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