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Message-Id: <11635337543512-git-send-email-psusi@cfl.rr.com> Date: Tue, 14 Nov 2006 14:49:14 -0500 From: Phillip Susi <psusi@....rr.com> To: linux-kernel@...r.kernel.org Subject: [PATCH] Update udf documentation to reflect current state of read/write support This patch changes Documentation/filesystems/udf.txt from saying that read/write mounts on cd media are not supported to instead state the current level of support. Specifically that it works fine on dvd+rw media and can be made to work on cd-rw media via the pktcdvd device. --- Documentation/filesystems/udf.txt | 13 +++++++++++-- 1 files changed, 11 insertions(+), 2 deletions(-) diff --git a/Documentation/filesystems/udf.txt b/Documentation/filesystems/udf.txt index 511b423..ed4ad3f 100644 --- a/Documentation/filesystems/udf.txt +++ b/Documentation/filesystems/udf.txt @@ -7,8 +7,17 @@ If you encounter problems with reading U please report them to linux_udf@...sjro.fc.hp.com, which is the developer's list. -Write support requires a block driver which supports writing. The current -scsi and ide cdrom drivers do not support writing. +Write support requires a block driver which supports writing. Currently +dvd+rw drives and media support true random sector writes, and so a udf +filesystem on such devices can be directly mounted read/write. CD-RW +media however, does not support this. Instead the media can be formatted +for packet mode using the utility cdrwtool, then the pktcdvd driver can +be bound to the underlying cd device to provide the required buffering +and read-modify-write cycles to allow the filesystem random sector writes +while providing the hardware with only full packet writes. While not +required for dvd+rw media, use of the pktcdvd driver often enhances +performance due to very poor read-modify-write support supplied internally +by drive firmware. ------------------------------------------------------------------------------- The following mount options are supported: -- 1.4.1 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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