From bdc817d2c6d64c230846b5a3f87d9922e1c0497e Mon Sep 17 00:00:00 2001 From: Phillip Susi Date: Thu, 16 Nov 2006 01:19:23 -0800 Subject: [PATCH] --- yaml --- r: 40945 b: refs/heads/master c: 55aa601e14cbec987fa577a895e9297df1d0a71d h: refs/heads/master i: 40943: 6c0fd6951fcff90eb18be0c3b432d8af56490905 v: v3 --- [refs] | 2 +- trunk/Documentation/filesystems/udf.txt | 13 +++++++++++-- 2 files changed, 12 insertions(+), 3 deletions(-) diff --git a/[refs] b/[refs] index c4d56d7224e3..b7603e77aa49 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: d6ddf55440833fd9404138026af246c51ebeef22 +refs/heads/master: 55aa601e14cbec987fa577a895e9297df1d0a71d diff --git a/trunk/Documentation/filesystems/udf.txt b/trunk/Documentation/filesystems/udf.txt index 511b4230c053..fde829a756e6 100644 --- a/trunk/Documentation/filesystems/udf.txt +++ b/trunk/Documentation/filesystems/udf.txt @@ -7,8 +7,17 @@ If you encounter problems with reading UDF discs using this driver, please report them to linux_udf@hpesjro.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: