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