The patch titled
Update udf documentation to reflect current state of read/write support
has been added to the -mm tree. Its filename is
update-udf-documentation-to-reflect-current-state-of-read-write-support.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Update udf documentation to reflect current state of read/write support
From: Phillip Susi <psusi@xxxxxxxxxx>
Change 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.
Cc: Peter Osterlund <petero2@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
Documentation/filesystems/udf.txt | 13 +++++++++++--
1 files changed, 11 insertions(+), 2 deletions(-)
diff -puN Documentation/filesystems/udf.txt~update-udf-documentation-to-reflect-current-state-of-read-write-support Documentation/filesystems/udf.txt
--- a/Documentation/filesystems/udf.txt~update-udf-documentation-to-reflect-current-state-of-read-write-support
+++ a/Documentation/filesystems/udf.txt
@@ -7,8 +7,17 @@ If you encounter problems with reading U
please report them to linux_udf@xxxxxxxxxxxxxxxxx, 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:
_
Patches currently in -mm which might be from psusi@xxxxxxxxxx are
update-udf-documentation-to-reflect-current-state-of-read-write-support.patch
-
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