linux-kernel - writable packet CD mounting in 2.6.26.x?

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Message-ID: <87ej52vtxq.fsf@hades.wkstn.nix>
Date:	Wed, 06 Aug 2008 20:12:49 +0100
From:	Nix <nix@...eri.org.uk>
To:	linux-kernel@...r.kernel.org
Subject: writable packet CD mounting in 2.6.26.x?

It seems to be impossible to mount packet-written CD-RWs writably in
2.6.26.x, even as root. Things worked in 2.6.25.x.

hades:/tmp# ls -l /dev/pktcdvd
total 0
brw-rw-rw- 1 root root  254,  0 2008-08-05 00:45 cdrw
crw-r--r-- 1 root root   10, 63 2008-08-05 00:44 control
brw-rw-rw- 1 root cdrom 254,  0 2008-08-05 00:45 pktcdvd0


hades:/tmp# mount -o rw /dev/pktcdvd/cdrw /mnt/pcdrw
mount: block device /dev/pktcdvd/cdrw is write-protected, mounting read-only

hades:/tmp# mount -o rw /dev/pktcdvd/pktcdvd0 /mnt/pcdrw
mount: block device /dev/pktcdvd/pktcdvd0 is write-protected, mounting read-only

The strace says that we get -EROFS always, now:

mount("/dev/pktcdvd/cdrw", "/mnt/pcdrw", "udf"..., MS_NOSUID|MS_NODEV|MS_NOEXEC|0x200000, NULL) = -1 EROFS (Read-only file system)


Anyone got any ideas? There are no suspicious-looking changes in
pktcdvd.c itself, so maybe this lies deeper in the block layer. Or
perhaps I'm mounting it wrong in some obscure way.
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