From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pat LaVarre Subject: Re: writable mmc profiles actually are writable Date: 06 Oct 2003 13:50:31 -0600 Sender: linux-scsi-owner@vger.kernel.org Message-ID: <1065469831.5185.44.camel@patehci2> References: <1064271322.4797.9.camel@patehci2> <1064847281.24854.2.camel@patehci2> <1064850600.25057.7.camel@patehci2> <20030929164654.GS15415@suse.de> <1064855570.3184.3.camel@patehci2> <1064865746.4262.63.camel@patehci2> <1065460336.10804.1.camel@patehci2> <1065463946.5185.8.camel@patehci2> <20031006182223.GF972@suse.de> <20031006182510.GG972@suse.de> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from email-out2.iomega.com ([147.178.1.83]:26829 "EHLO email.iomega.com") by vger.kernel.org with ESMTP id S261585AbTJFTul (ORCPT ); Mon, 6 Oct 2003 15:50:41 -0400 In-Reply-To: <20031006182510.GG972@suse.de> List-Id: linux-scsi@vger.kernel.org To: axboe@suse.de Cc: linux-scsi@vger.kernel.org > assuming this has to do with misdetected hardware? Seemingly so, aye. > hardware? I'm plugging in a pre-production sample of a new device. Seemingly I cannot mkudffs its disks except by patching the kernel. That's normal for yet another new kind of dvd/cd, yes? Via sg I see 35 GB of 64 KiB/block writes, 2 KiB/block reads, with writable profile x0002 removable_disk of the 1999 mmc 2 standard. Yes pdt x05 dvd/cd, yes feature x0020 random_writable, no not the cd_r, cd_rw, dvd, dvd_r, and dvd_ram enumerated in the obsolete legacy 1997 mmc 1 mode page x2A Capabilities. Previously near here we discussed some as-yet-ineffective alternatives to my patch: the Andy Polyakov patch for mount -w of dvd+rw, the Jens Axboe patch for mount -w of cd-rw, and blockdev --setrw. > The uniform layer uses CDC_DVD_RAM as meaning > randomly writable media, When I try setting CDC_DVD_RAM for a device, I see /proc/sys/dev/cdrom/info erroneously reports: Can write DVD-RAM: 1 I conclude we wish to express the discovery of feature x0020 random_writable differently. Wrong? In weak confirmation, earlier I did see the usb-storage folk reject a patch to tweak mode page x2A to appear to have mode page x2A byte 3 mask x20 dvd_ram_write set. Should I submit a patch like that for sr_mod.ko and ide-cd.ko? > Calling read-only media failing to be opened > read-write as "uncooperative" is confusing, Clear now? I mean to say, sg_dd shows the real disk of the real device is randomly rewritable. But cdrom.ko and sr_mod.ko refuse to pass writes thru. > screws threading of decent mailers Sorry. I'm pleased to mention people have kindly volunteered offline to help me avoid repeating that. Pat LaVarre