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authorPhillip Susi <psusi@cfl.rr.com>2006-11-16 01:19:23 -0800
committerLinus Torvalds <torvalds@woody.osdl.org>2006-11-16 11:43:38 -0800
commit55aa601e14cbec987fa577a895e9297df1d0a71d (patch)
treeed7012c8a560f39c28974518260039969548588a /Documentation
parentd6ddf55440833fd9404138026af246c51ebeef22 (diff)
downloadlinux-linaro-stable-55aa601e14cbec987fa577a895e9297df1d0a71d.tar.gz
[PATCH] Update udf documentation to reflect current state of read/write support
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@telia.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/filesystems/udf.txt13
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/filesystems/udf.txt b/Documentation/filesystems/udf.txt
index 511b4230c053..fde829a756e6 100644
--- a/Documentation/filesystems/udf.txt
+++ b/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.
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