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1 | * |
2 | * Documentation/filesystems/udf.txt | |
3 | * | |
4 | UDF Filesystem version 0.9.8.1 | |
5 | ||
6 | If you encounter problems with reading UDF discs using this driver, | |
7 | please report them to linux_udf@hpesjro.fc.hp.com, which is the | |
8 | developer's list. | |
9 | ||
55aa601e PS |
10 | Write support requires a block driver which supports writing. Currently |
11 | dvd+rw drives and media support true random sector writes, and so a udf | |
12 | filesystem on such devices can be directly mounted read/write. CD-RW | |
13 | media however, does not support this. Instead the media can be formatted | |
14 | for packet mode using the utility cdrwtool, then the pktcdvd driver can | |
15 | be bound to the underlying cd device to provide the required buffering | |
16 | and read-modify-write cycles to allow the filesystem random sector writes | |
17 | while providing the hardware with only full packet writes. While not | |
18 | required for dvd+rw media, use of the pktcdvd driver often enhances | |
19 | performance due to very poor read-modify-write support supplied internally | |
20 | by drive firmware. | |
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21 | |
22 | ------------------------------------------------------------------------------- | |
23 | The following mount options are supported: | |
24 | ||
25 | gid= Set the default group. | |
26 | umask= Set the default umask. | |
27 | uid= Set the default user. | |
28 | bs= Set the block size. | |
29 | unhide Show otherwise hidden files. | |
30 | undelete Show deleted files in lists. | |
31 | adinicb Embed data in the inode (default) | |
32 | noadinicb Don't embed data in the inode | |
33 | shortad Use short ad's | |
34 | longad Use long ad's (default) | |
35 | nostrict Unset strict conformance | |
36 | iocharset= Set the NLS character set | |
37 | ||
0e6b3e5e PS |
38 | The uid= and gid= options need a bit more explaining. They will accept a |
39 | decimal numeric value which will be used as the default ID for that mount. | |
40 | They will also accept the string "ignore" and "forget". For files on the disk | |
41 | that are owned by nobody ( -1 ), they will instead look as if they are owned | |
42 | by the default ID. The ignore option causes the default ID to override all | |
43 | IDs on the disk, not just -1. The forget option causes all IDs to be written | |
44 | to disk as -1, so when the media is later remounted, they will appear to be | |
45 | owned by whatever default ID it is mounted with at that time. | |
46 | ||
47 | For typical desktop use of removable media, you should set the ID to that | |
48 | of the interactively logged on user, and also specify both the forget and | |
49 | ignore options. This way the interactive user will always see the files | |
50 | on the disk as belonging to him. | |
51 | ||
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52 | The remaining are for debugging and disaster recovery: |
53 | ||
54 | novrs Skip volume sequence recognition | |
55 | ||
56 | The following expect a offset from 0. | |
57 | ||
58 | session= Set the CDROM session (default= last session) | |
59 | anchor= Override standard anchor location. (default= 256) | |
60 | volume= Override the VolumeDesc location. (unused) | |
61 | partition= Override the PartitionDesc location. (unused) | |
62 | lastblock= Set the last block of the filesystem/ | |
63 | ||
64 | The following expect a offset from the partition root. | |
65 | ||
66 | fileset= Override the fileset block location. (unused) | |
67 | rootdir= Override the root directory location. (unused) | |
68 | WARNING: overriding the rootdir to a non-directory may | |
69 | yield highly unpredictable results. | |
70 | ------------------------------------------------------------------------------- | |
71 | ||
72 | ||
73 | For the latest version and toolset see: | |
74 | http://linux-udf.sourceforge.net/ | |
75 | ||
76 | Documentation on UDF and ECMA 167 is available FREE from: | |
77 | http://www.osta.org/ | |
78 | http://www.ecma-international.org/ | |
79 | ||
80 | Ben Fennema <bfennema@falcon.csc.calpoly.edu> |