From: Pat LaVarre <p.lavarre@ieee.org>
To: linux-scsi@vger.kernel.org
Subject: writable mmc profiles actually are writable
Date: 06 Oct 2003 12:12:26 -0600 [thread overview]
Message-ID: <1065463946.5185.8.camel@patehci2> (raw)
In-Reply-To: <1065460336.10804.1.camel@patehci2>
> Newsgroups: mlist.linux.scsi
> Date: 2003-09-10 16:00:27 PST
> Subject: Re: [PATCH] mount -w of dvd+rw etc. in vanilla 2.6
> From: Patrick Mansfield (patmans@us.ibm.com)
>
> Should sd.c and sr.c be calling set_device_ro?
> (after adding a read only block device, or
> changing back to read/write)?
That good question stands open, I think.
The following inline plain text, now revved for -test6 & posted here,
allows modprobe to overcome such uncooperative attitudes as:
$ sudo dd if=/dev/scd2 bs=2k count=1 | wc
1+0 records in
1+0 records out
0 0 2048
$
$ sudo dd of=/dev/scd2 bs=2k count=1 if=/dev/zero
dd: opening `/dev/scd2': Read-only file system
$
Allowing dd, mkudffs, etc. are the good consequences. The evil
consequences I do not yet know. I do notice we have achieved
writability without extending the enumeration that `cat
/proc/sys/dev/cdrom/info` dumps:
Can write CD-R: 0
Can write CD-RW: 0
Can read DVD: 0
Can write DVD-R: 0
Can write DVD-RAM: 0
Pat LaVarre
diff -ur linux-2.6.0-test6/drivers/cdrom/cdrom.c linux/drivers/cdrom/cdrom.c
--- linux-2.6.0-test6/drivers/cdrom/cdrom.c 2003-09-27 18:50:10.000000000 -0600
+++ linux/drivers/cdrom/cdrom.c 2003-10-06 11:53:41.826299728 -0600
@@ -426,8 +426,8 @@
if ((fp->f_flags & O_NONBLOCK) && (cdi->options & CDO_USE_FFLAGS))
ret = cdi->ops->open(cdi, 1);
else {
- if ((fp->f_mode & FMODE_WRITE) && !CDROM_CAN(CDC_DVD_RAM))
- return -EROFS;
+// if ((fp->f_mode & FMODE_WRITE) && !CDROM_CAN(CDC_DVD_RAM))
+// return -EROFS;
ret = open_for_data(cdi);
}
diff -ur linux-2.6.0-test6/drivers/scsi/sr.c linux/drivers/scsi/sr.c
--- linux-2.6.0-test6/drivers/scsi/sr.c 2003-09-27 18:50:13.000000000 -0600
+++ linux/drivers/scsi/sr.c 2003-10-06 11:51:59.655832000 -0600
@@ -327,8 +327,8 @@
}
if (rq_data_dir(SCpnt->request) == WRITE) {
- if (!cd->device->writeable)
- return 0;
+// if (!cd->device->writeable)
+// return 0;
SCpnt->cmnd[0] = WRITE_10;
SCpnt->sc_data_direction = SCSI_DATA_WRITE;
} else if (rq_data_dir(SCpnt->request) == READ) {
next prev parent reply other threads:[~2003-10-06 18:12 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-22 22:55 [linux-usb-devel] Re: USB storage problems on OHCI Pat LaVarre
2003-09-29 14:54 ` Pat LaVarre
2003-09-29 15:50 ` 2 KiB/block loopback found where Pat LaVarre
2003-09-29 16:46 ` Jens Axboe
2003-09-29 17:12 ` Pat LaVarre
2003-09-29 20:02 ` Pat LaVarre
2003-10-06 17:12 ` max GiB written per boot Pat LaVarre
2003-10-06 18:12 ` Pat LaVarre [this message]
2003-10-06 18:22 ` writable mmc profiles actually are writable Jens Axboe
2003-10-06 18:25 ` Jens Axboe
2003-10-06 19:50 ` Pat LaVarre
2003-10-06 20:38 ` Jens Axboe
2003-10-06 20:58 ` Pat LaVarre
2003-10-06 22:14 ` Pat LaVarre
2003-10-06 23:56 ` Pat LaVarre
2003-10-07 5:38 ` Jens Axboe
2003-10-07 6:45 ` Matthew Dharm
2003-10-07 6:48 ` Jens Axboe
2003-10-07 7:00 ` Matthew Dharm
2003-10-07 7:04 ` Jens Axboe
2003-10-10 20:36 ` Pat LaVarre
2003-10-10 21:04 ` Pat LaVarre
2003-10-10 21:25 ` Pat LaVarre
2003-10-10 22:43 ` Pat LaVarre
2003-10-10 23:16 ` Pat LaVarre
2003-10-11 0:43 ` Pat LaVarre
2003-10-07 20:46 ` Pat LaVarre
2003-10-07 21:00 ` Jens Axboe
2003-10-09 23:01 ` Pat LaVarre
2003-10-07 7:00 ` Jens Axboe
2003-10-06 20:10 ` Pat LaVarre
2003-10-06 20:28 ` Jens Axboe
2003-10-06 20:21 ` Pat LaVarre
2003-10-06 20:33 ` Jens Axboe
2003-10-06 21:00 ` max GiB written per boot Pat LaVarre
2003-10-06 23:47 ` Pat LaVarre
2003-10-07 5:57 ` Jens Axboe
2003-10-07 22:12 ` Randy.Dunlap
2003-10-07 22:57 ` Willem Riede
2003-10-08 1:27 ` Randy.Dunlap
2003-10-08 4:34 ` Randy.Dunlap
2003-10-08 6:44 ` Jens Axboe
2003-10-09 21:59 ` Pat LaVarre
2003-10-10 20:54 ` Pat LaVarre
2003-10-07 0:51 ` 2 KiB/block loopback found where Pat LaVarre
2003-09-29 17:55 ` aligned /dev/scd$n reads less rare how Pat LaVarre
2003-09-29 19:39 ` zip of GiB cross-platform Pat LaVarre
2003-09-29 19:50 ` Matthew Wilcox
2003-09-29 19:56 ` Pat LaVarre
2003-10-24 14:41 ` aligned /dev/scd$n reads less rare how Pat LaVarre
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