mirror of
https://github.com/torvalds/linux.git
synced 2024-12-12 22:23:55 +00:00
67 lines
2.7 KiB
Plaintext
67 lines
2.7 KiB
Plaintext
*
|
|
* Documentation/filesystems/udf.txt
|
|
*
|
|
|
|
If you encounter problems with reading UDF discs using this driver,
|
|
please report them according to MAINTAINERS file.
|
|
|
|
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.
|
|
mode= Set the default file permissions.
|
|
dmode= Set the default directory permissions.
|
|
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 and all inodes on that mount will then appear as
|
|
belonging to that uid and gid. Mount options also accept the string "forget".
|
|
The forget option causes all IDs to be written to disk as -1 which is a way
|
|
of UDF standard to indicate that IDs are not supported for these files .
|
|
|
|
For typical desktop use of removable media, you should set the ID to that of
|
|
the interactively logged on user, and also specify the forget option. 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)
|
|
lastblock= Set the last block of the filesystem/
|
|
|
|
-------------------------------------------------------------------------------
|
|
|
|
|
|
For the latest version and toolset see:
|
|
https://github.com/pali/udftools
|
|
|
|
Documentation on UDF and ECMA 167 is available FREE from:
|
|
http://www.osta.org/
|
|
http://www.ecma-international.org/
|