On 12/24/2009 09:02 AM, Naphtali Sprei wrote:
The new option is: access=[rw|ro|auto]
rw: open the drive's file with Read and Write permission, don't continue if
failed
ro: open the file only with Read permission
auto: open the file with Read and Write permission, if failed, try only Read
permision
For compatibility reasons, the default is 'auto'. Should be changed later on.
This option replaces the 'readonly' options added lately.
Instead of using the field 'readonly' of the BlockDriverState struct for
passing the request,
pass the request in the flags parameter to the function.
The BDRV_O_RDWR/RDONLY becomes just one bit, BDRV_O_RDONLY gone.
Users shouldn't be involved in deciding how an image is open.
Instead, marking a drive read only (via readonly) should cause a file to
be open read-only. By default, when media=cdrom, we should toggle the
readonly flag.
As for the behaviour with trying read-write and then read-only, let's
just drop it. It's a bug and I've seen it reported half a dozen times
as such.
Regards,
Anthony Liguori
