Fmask
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The following is copy pasted from man mount.
umask=value Set the umask (the bitmask of the permissions that are not present). The default is the umask of the current process. The value is given in octal. dmask=value Set the umask applied to directories only. The default is the umask of the current process. The value is given in octal. fmask=value Set the umask applied to regular files only. The default is the umask of the current process. The value is given in octal.
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[edit] Examples
The following is an example of a user's /etc/fstab file.
# /etc/fstab: static file system information. # <file system> <mount point> <type> <options> <dump> <pass> /dev/hda1 /media/win ntfs rw,suid,dev,exec,auto,user,async,fmask=113,dmask=002,gid=46 0 1 /dev/hda2 /media/big vfat rw,suid,dev,exec,auto,user,async,fmask=113,dmask=002,gid=46,utf8 0 1 /dev/hdb1 /media/old vfat rw,suid,dev,exec,auto,user,async,fmask=113,dmask=002,gid=46,utf8 0 1
The meanig of dmask and fmask is as follows.
The directories will have rwx rwx r-x (775) permissions,
while the files will have rw- rw- r-- (664) permissions.
To know how the values are calculated read ahead.
[edit] Directories
Full access for directories is 777.
777 AND NOT 002 = 775
in detail:
7778 = 111 111 1112
0028 = 000 000 0102
NOT 000 000 0102 = 111 111 1012
111 111 1112 (777)
AND 111 111 1012 (775)
111 111 1012 (775)
[edit] Files
Full access for files is 666.
666 AND NOT 113 = 664
in detail:
6668 = 110 110 1102
1138 = 001 001 0112
NOT 001 001 0112 = 110 110 1002
110 110 1102 (666)
AND 110 110 1002 (664)
111 111 1012 (664)
