Shall I call you god now? :-)
No me. Err, wikipedia:
Why invoke wikipedia when "man attr" is at hand?
Quote:
------------------------
This document describes the attr command, which is mostly compatible
with the IRIX command of the same name. It is thus aimed
specifically
at users of the XFS filesystem - for filesystem independent
extended
attribute manipulation, consult the getfattr(1) and
setfattr(1) docu-
mentation.
In the XFS filesystem, the names can be up to 256 bytes in
length, ter-
minated by the first 0 byte. The intent is that they be
printable
ASCII (or other character set) names for the attribute. The
values can
be up to 64KB of arbitrary binary data.
Attributes can be attached to all types of XFS inodes: regular
files,
directories, symbolic links, device nodes, etc.
XFS uses 2 disjoint attribute name spaces associated
with every
filesystem object. They are the root and user address
spaces. The
root address space is accessable only to the superuser, and
then only
by specifying a flag argument to the function call. Other
users will
not see or be able to modify attributes in the root address
space. The
user address space is protected by the normal file permissions
mecha-
nism, so the owner of the file can decide who is able to see
and/or
modify the value of attributes on any particular file.
------------------------
The question still stands in what concerns ext3/ext4.
About a year ago I posted the following to this Samba list:
------------------------
I am now experimenting with samba 3.3.0 and acl_xattr. I can see that
there is another method of storing Windows ACLs: acl_tdb.
Can someone here tell me something about the relative merits and
demerits of those two methods?
I am using CentOS with an ext3 filesystem.
------------------------
The (only) answer I got was the following:
------------------------
xattrs have size limitations on most file systems, so you
won't be able to store truly large ACLs. Don't know the
numbers for ext3.
The tdb one is there for file systems without xattrs or with
too severe limitations for them, but it has issues with
native unix backup/restore (acls are indexed by inode).
------------------------
And that was all. Hence my comment about the "secrets of the gods".
Samba comes with several methods of storing ACLs. Is it too much to ask for
just a little information about them so that the users can make a decision, even
if those users are not experts on the inwards of filesystem development?
Than you to all who posted answers my question.
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