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- Add a SPDX header; - Add a document title; - Add table markups; - Add lists markups; - Add it to filesystems/index.rst. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Acked-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/2887f8a3a813a31170389eab687e9f199327dc7d.1581955849.git.mchehab+huawei@kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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3.0 KiB
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76 lines
3.0 KiB
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.. SPDX-License-Identifier: GPL-2.0
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===============
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UDF file system
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===============
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If you encounter problems with reading UDF discs using this driver,
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please report them according to MAINTAINERS file.
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Write support requires a block driver which supports writing. Currently
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dvd+rw drives and media support true random sector writes, and so a udf
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filesystem on such devices can be directly mounted read/write. CD-RW
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media however, does not support this. Instead the media can be formatted
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for packet mode using the utility cdrwtool, then the pktcdvd driver can
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be bound to the underlying cd device to provide the required buffering
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and read-modify-write cycles to allow the filesystem random sector writes
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while providing the hardware with only full packet writes. While not
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required for dvd+rw media, use of the pktcdvd driver often enhances
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performance due to very poor read-modify-write support supplied internally
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by drive firmware.
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-------------------------------------------------------------------------------
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The following mount options are supported:
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=========== ======================================
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gid= Set the default group.
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umask= Set the default umask.
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mode= Set the default file permissions.
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dmode= Set the default directory permissions.
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uid= Set the default user.
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bs= Set the block size.
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unhide Show otherwise hidden files.
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undelete Show deleted files in lists.
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adinicb Embed data in the inode (default)
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noadinicb Don't embed data in the inode
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shortad Use short ad's
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longad Use long ad's (default)
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nostrict Unset strict conformance
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iocharset= Set the NLS character set
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=========== ======================================
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The uid= and gid= options need a bit more explaining. They will accept a
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decimal numeric value and all inodes on that mount will then appear as
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belonging to that uid and gid. Mount options also accept the string "forget".
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The forget option causes all IDs to be written to disk as -1 which is a way
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of UDF standard to indicate that IDs are not supported for these files .
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For typical desktop use of removable media, you should set the ID to that of
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the interactively logged on user, and also specify the forget option. This way
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the interactive user will always see the files on the disk as belonging to him.
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The remaining are for debugging and disaster recovery:
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===== ================================
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novrs Skip volume sequence recognition
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===== ================================
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The following expect a offset from 0.
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========== =================================================
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session= Set the CDROM session (default= last session)
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anchor= Override standard anchor location. (default= 256)
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lastblock= Set the last block of the filesystem/
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========== =================================================
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-------------------------------------------------------------------------------
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For the latest version and toolset see:
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https://github.com/pali/udftools
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Documentation on UDF and ECMA 167 is available FREE from:
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- http://www.osta.org/
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- http://www.ecma-international.org/
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