55aa601e14
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>
80 lines
3.3 KiB
Text
80 lines
3.3 KiB
Text
*
|
|
* Documentation/filesystems/udf.txt
|
|
*
|
|
UDF Filesystem version 0.9.8.1
|
|
|
|
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. 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:
|
|
|
|
gid= Set the default group.
|
|
umask= Set the default umask.
|
|
uid= Set the default user.
|
|
bs= Set the block size.
|
|
unhide Show otherwise hidden files.
|
|
undelete Show deleted files in lists.
|
|
adinicb Embed data in the inode (default)
|
|
noadinicb Don't embed data in the inode
|
|
shortad Use short ad's
|
|
longad Use long ad's (default)
|
|
nostrict Unset strict conformance
|
|
iocharset= Set the NLS character set
|
|
|
|
The uid= and gid= options need a bit more explaining. They will accept a
|
|
decimal numeric value which will be used as the default ID for that mount.
|
|
They will also accept the string "ignore" and "forget". For files on the disk
|
|
that are owned by nobody ( -1 ), they will instead look as if they are owned
|
|
by the default ID. The ignore option causes the default ID to override all
|
|
IDs on the disk, not just -1. The forget option causes all IDs to be written
|
|
to disk as -1, so when the media is later remounted, they will appear to be
|
|
owned by whatever default ID it is mounted with at that time.
|
|
|
|
For typical desktop use of removable media, you should set the ID to that
|
|
of the interactively logged on user, and also specify both the forget and
|
|
ignore options. This way the interactive user will always see the files
|
|
on the disk as belonging to him.
|
|
|
|
The remaining are for debugging and disaster recovery:
|
|
|
|
novrs Skip volume sequence recognition
|
|
|
|
The following expect a offset from 0.
|
|
|
|
session= Set the CDROM session (default= last session)
|
|
anchor= Override standard anchor location. (default= 256)
|
|
volume= Override the VolumeDesc location. (unused)
|
|
partition= Override the PartitionDesc location. (unused)
|
|
lastblock= Set the last block of the filesystem/
|
|
|
|
The following expect a offset from the partition root.
|
|
|
|
fileset= Override the fileset block location. (unused)
|
|
rootdir= Override the root directory location. (unused)
|
|
WARNING: overriding the rootdir to a non-directory may
|
|
yield highly unpredictable results.
|
|
-------------------------------------------------------------------------------
|
|
|
|
|
|
For the latest version and toolset see:
|
|
http://linux-udf.sourceforge.net/
|
|
|
|
Documentation on UDF and ECMA 167 is available FREE from:
|
|
http://www.osta.org/
|
|
http://www.ecma-international.org/
|
|
|
|
Ben Fennema <bfennema@falcon.csc.calpoly.edu>
|