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>
81 lines
3.3 KiB
Plaintext
81 lines
3.3 KiB
Plaintext
*
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* Documentation/filesystems/udf.txt
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*
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UDF Filesystem version 0.9.8.1
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If you encounter problems with reading UDF discs using this driver,
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please report them to linux_udf@hpesjro.fc.hp.com, which is the
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developer's list.
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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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gid= Set the default group.
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umask= Set the default umask.
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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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The uid= and gid= options need a bit more explaining. They will accept a
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decimal numeric value which will be used as the default ID for that mount.
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They will also accept the string "ignore" and "forget". For files on the disk
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that are owned by nobody ( -1 ), they will instead look as if they are owned
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by the default ID. The ignore option causes the default ID to override all
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IDs on the disk, not just -1. The forget option causes all IDs to be written
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to disk as -1, so when the media is later remounted, they will appear to be
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owned by whatever default ID it is mounted with at that time.
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For typical desktop use of removable media, you should set the ID to that
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of the interactively logged on user, and also specify both the forget and
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ignore options. This way the interactive user will always see the files
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on the disk as belonging to him.
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The remaining are for debugging and disaster recovery:
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novrs Skip volume sequence recognition
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The following expect a offset from 0.
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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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volume= Override the VolumeDesc location. (unused)
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partition= Override the PartitionDesc location. (unused)
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lastblock= Set the last block of the filesystem/
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The following expect a offset from the partition root.
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fileset= Override the fileset block location. (unused)
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rootdir= Override the root directory location. (unused)
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WARNING: overriding the rootdir to a non-directory may
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yield highly unpredictable results.
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-------------------------------------------------------------------------------
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For the latest version and toolset see:
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http://linux-udf.sourceforge.net/
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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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Ben Fennema <bfennema@falcon.csc.calpoly.edu>
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