FAT, NTFS, CIFS and DOS attributes
H. Peter Anvin
hpa at zytor.com
Tue Jan 4 01:48:43 GMT 2005
Nicholas Miell wrote:
> The design isn't broken, you're just missing an important detail of what
> the system namespace entails:
> xattrs in the system namespace have a format defined by the kernel and
> (more importantly -- this is the important detail) modify kernel
> If the xattr namespace was flat, I would have no way of knowing whether
> or not the kernel will set the Archived bit in fatattrs (or DosAttrib)
> xattr when I write to a file that has that xattr or whether or not the
> kernel will choose to enforce the ACL I store in the posix_acl_access
> With the system namespace, I can rely on the fact that xattrs in that
> namespace actually have a meaning and are in sync with what the kernel
> believes to be true about the file.
What you're neglecting is that there is a LARGE class of metadata where
the important thing is that you store them; if you don't know what they
are you merely ignore them and keep them as-is.
There is no place for those in the current design.
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