1*4882a593Smuzhiyun.. SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun=============== 4*4882a593SmuzhiyunUDF file system 5*4882a593Smuzhiyun=============== 6*4882a593Smuzhiyun 7*4882a593SmuzhiyunIf you encounter problems with reading UDF discs using this driver, 8*4882a593Smuzhiyunplease report them according to MAINTAINERS file. 9*4882a593Smuzhiyun 10*4882a593SmuzhiyunWrite support requires a block driver which supports writing. Currently 11*4882a593Smuzhiyundvd+rw drives and media support true random sector writes, and so a udf 12*4882a593Smuzhiyunfilesystem on such devices can be directly mounted read/write. CD-RW 13*4882a593Smuzhiyunmedia however, does not support this. Instead the media can be formatted 14*4882a593Smuzhiyunfor packet mode using the utility cdrwtool, then the pktcdvd driver can 15*4882a593Smuzhiyunbe bound to the underlying cd device to provide the required buffering 16*4882a593Smuzhiyunand read-modify-write cycles to allow the filesystem random sector writes 17*4882a593Smuzhiyunwhile providing the hardware with only full packet writes. While not 18*4882a593Smuzhiyunrequired for dvd+rw media, use of the pktcdvd driver often enhances 19*4882a593Smuzhiyunperformance due to very poor read-modify-write support supplied internally 20*4882a593Smuzhiyunby drive firmware. 21*4882a593Smuzhiyun 22*4882a593Smuzhiyun------------------------------------------------------------------------------- 23*4882a593Smuzhiyun 24*4882a593SmuzhiyunThe following mount options are supported: 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun =========== ====================================== 27*4882a593Smuzhiyun gid= Set the default group. 28*4882a593Smuzhiyun umask= Set the default umask. 29*4882a593Smuzhiyun mode= Set the default file permissions. 30*4882a593Smuzhiyun dmode= Set the default directory permissions. 31*4882a593Smuzhiyun uid= Set the default user. 32*4882a593Smuzhiyun bs= Set the block size. 33*4882a593Smuzhiyun unhide Show otherwise hidden files. 34*4882a593Smuzhiyun undelete Show deleted files in lists. 35*4882a593Smuzhiyun adinicb Embed data in the inode (default) 36*4882a593Smuzhiyun noadinicb Don't embed data in the inode 37*4882a593Smuzhiyun shortad Use short ad's 38*4882a593Smuzhiyun longad Use long ad's (default) 39*4882a593Smuzhiyun nostrict Unset strict conformance 40*4882a593Smuzhiyun iocharset= Set the NLS character set 41*4882a593Smuzhiyun =========== ====================================== 42*4882a593Smuzhiyun 43*4882a593SmuzhiyunThe uid= and gid= options need a bit more explaining. They will accept a 44*4882a593Smuzhiyundecimal numeric value and all inodes on that mount will then appear as 45*4882a593Smuzhiyunbelonging to that uid and gid. Mount options also accept the string "forget". 46*4882a593SmuzhiyunThe forget option causes all IDs to be written to disk as -1 which is a way 47*4882a593Smuzhiyunof UDF standard to indicate that IDs are not supported for these files . 48*4882a593Smuzhiyun 49*4882a593SmuzhiyunFor typical desktop use of removable media, you should set the ID to that of 50*4882a593Smuzhiyunthe interactively logged on user, and also specify the forget option. This way 51*4882a593Smuzhiyunthe interactive user will always see the files on the disk as belonging to him. 52*4882a593Smuzhiyun 53*4882a593SmuzhiyunThe remaining are for debugging and disaster recovery: 54*4882a593Smuzhiyun 55*4882a593Smuzhiyun ===== ================================ 56*4882a593Smuzhiyun novrs Skip volume sequence recognition 57*4882a593Smuzhiyun ===== ================================ 58*4882a593Smuzhiyun 59*4882a593SmuzhiyunThe following expect a offset from 0. 60*4882a593Smuzhiyun 61*4882a593Smuzhiyun ========== ================================================= 62*4882a593Smuzhiyun session= Set the CDROM session (default= last session) 63*4882a593Smuzhiyun anchor= Override standard anchor location. (default= 256) 64*4882a593Smuzhiyun lastblock= Set the last block of the filesystem/ 65*4882a593Smuzhiyun ========== ================================================= 66*4882a593Smuzhiyun 67*4882a593Smuzhiyun------------------------------------------------------------------------------- 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun 70*4882a593SmuzhiyunFor the latest version and toolset see: 71*4882a593Smuzhiyun https://github.com/pali/udftools 72*4882a593Smuzhiyun 73*4882a593SmuzhiyunDocumentation on UDF and ECMA 167 is available FREE from: 74*4882a593Smuzhiyun - http://www.osta.org/ 75*4882a593Smuzhiyun - https://www.ecma-international.org/ 76