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When I move my todo text files to my blackberry they are marked as 'executable'. I want to fix this by setting permissions with umask= in fstab. The following setting didn't work.
LABEL=BLACKBERRY /media/blackberry vfat user,umask=777 0 0
I get permission denied when I try to enter /media/blackberry. I tried chmodding /media/blackberry to no avail. Anyone has an idea which option need to be set in fstab in order to mount an fat32 device with persistent permissions?
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Perhaps "users" is what you need?
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If you set umask=777, that means that all files and directory from this file system (from BLACKBERRY) will have permission 000 (no read, no write, no execute, whoever you are).
This is the case, including for the root directory of your file system.
vfat has no permissions. So permissions come from the umask. You cannot chmod things in your partition. You chmod has no effect here.
Since vfat has no permissions, the permissions are the default one, BUT the one masked by umask.
If you want to remove execute permission, you have to choose umask=111
But then you will not be able to do anything, since you need "x" flag on directories.
The solution is then not to use umask but fmask and dmask (eg, dmask=000 fmask=111 ; or dmask=077, fmask=177 - depends on the permission you want to grant to other users)
Last edited by chlg (2010-01-15 23:36:06)
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Perhaps "users" is what you need?
Thanks for the help, I changed 'user' to 'users' but the problem persisted.
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If you set umask=777, that means that all files and directory from this file system (from BLACKBERRY) will have permission 000 (no read, no write, no execute, whoever you are).
This is the case, including for the root directory of your file system.
vfat has no permissions. So permissions come from the umask. You cannot chmod things in your partition. You chmod has no effect here.Since vfat has no permissions, the permissions are the default one, BUT the one masked by umask.
If you want to remove execute permission, you have to choose umask=111
But then you will not be able to do anything, since you need "x" flag on directories.The solution is then not to use umask but fmask and dmask (eg, dmask=000 fmask=111 ; or dmask=077, fmask=177 - depends on the permission you want to grant to other users)
Thanks, your suggestion worked! Are the dmask and fmask permission the same permission you set with chmod? That way 'dmask=000' no one has permission, fmask=111= owner,group,other have execute permission. However this doens't seem the case with the following line in fstab I can add files and folders to my blackberry:
LABEL=BLACKBERRY /media/blackberry vfat noauto,users,dmask=000,fmask=111 0 0# ls -la /media/
drwxrwxrwx 4 Kasumi_Ninja root 16384 Jan 16 15:56 blackberryLast edited by Kasumi_Ninja (2010-01-16 14:59:27)
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No. dmask and fmask are the same mask you type in "umask".
That is, roughly, the reverse.
I suppose you know that to understand these masks you have to take into account the fact they are octal string of a bit mask.
Ie
000 = 000 000 000
111 = 001 001 001
777 = 111 111 111
and that these bits read
rwx(owner) rwx(group) rwx(world)
What you give to chmod are mask where 1 means "can do" and 0 means "cannot do"
What you give to umask are mask where 1 means "cannot do", and 0 means "might be able to do if chmod is ok for that ^^"
The point of umask is to add restriction on what you can do.
Since on vfat, the files has no permissions (understand : anybody can do whatever he wants to), for vfat umask is roughly the reverse of chmod. So 111 is "nobody can execute"
BTW : "users" ou "user" is not related to your problem
"user" means that any user can mount the filesystem, but only the user who's mounted it can unmount it
"users" means "any user can mount or unmount the filesystem"
Last edited by chlg (2010-01-16 23:38:23)
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