Root/Documentation/filesystems/adfs.txt

1Mount options for ADFS
2----------------------
3
4  uid=nnn All files in the partition will be owned by
5        user id nnn. Default 0 (root).
6  gid=nnn All files in the partition will be in group
7        nnn. Default 0 (root).
8  ownmask=nnn The permission mask for ADFS 'owner' permissions
9        will be nnn. Default 0700.
10  othmask=nnn The permission mask for ADFS 'other' permissions
11        will be nnn. Default 0077.
12
13Mapping of ADFS permissions to Linux permissions
14------------------------------------------------
15
16  ADFS permissions consist of the following:
17
18    Owner read
19    Owner write
20    Other read
21    Other write
22
23  (In older versions, an 'execute' permission did exist, but this
24   does not hold the same meaning as the Linux 'execute' permission
25   and is now obsolete).
26
27  The mapping is performed as follows:
28
29    Owner read -> -r--r--r--
30    Owner write -> --w--w---w
31    Owner read and filetype UnixExec -> ---x--x--x
32    These are then masked by ownmask, eg 700 -> -rwx------
33    Possible owner mode permissions -> -rwx------
34
35    Other read -> -r--r--r--
36    Other write -> --w--w--w-
37    Other read and filetype UnixExec -> ---x--x--x
38    These are then masked by othmask, eg 077 -> ----rwxrwx
39    Possible other mode permissions -> ----rwxrwx
40
41  Hence, with the default masks, if a file is owner read/write, and
42  not a UnixExec filetype, then the permissions will be:
43
44            -rw-------
45
46  However, if the masks were ownmask=0770,othmask=0007, then this would
47  be modified to:
48            -rw-rw----
49
50  There is no restriction on what you can do with these masks. You may
51  wish that either read bits give read access to the file for all, but
52  keep the default write protection (ownmask=0755,othmask=0577):
53
54            -rw-r--r--
55
56  You can therefore tailor the permission translation to whatever you
57  desire the permissions should be under Linux.
58

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