root-only-write on ext2

Bob Edwards (Robert.Edwards@anu.edu.au)
Wed, 18 Aug 1999 17:19:34 +1000

Is it possible to mount an ext2 file-system so that only root has
write permission, regardless of individual write permissions on
individual files and directories? If not, how hard would it be to
implement? I have been looking at linux/fs/ext2/acl.c and it looks
like it might already be there, but it isn't apparent as to how to
control the option.

My application is to create a "backup" filesystem using rsync. I want
root to be able to write the files into the filesystem, preserving all
the access modes and ownerships etc. I want individual users to be able
to read back their own files, but not to delete or otherwise modify
them.

Any clues would be appreciated.

Cheers,

Bob Edwards,
Dept. of Computer Science,
A.N.U., Australia.

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