| * |
| * 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/ |