Commit | Line | Data |
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1da177e4 LT |
1 | Mount options for ADFS |
2 | ---------------------- | |
3 | ||
4 | uid=nnn All files in the partition will be owned by | |
5 | user id nnn. Default 0 (root). | |
4ae0edc2 | 6 | gid=nnn All files in the partition will be in group |
1da177e4 LT |
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 | ||
13 | Mapping 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. |