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Extended attributes

Extended attributes

Posted Apr 16, 2005 0:40 UTC (Sat) by giraffedata (subscriber, #1954)
In reply to: Extended attributes by proski
Parent article: FUSE hits a snag

If the permissions on a file don't reflect what file operations are actually allowed, what's the point in presenting them as permissions?

The point is that some people want to use the standard tools, not an arcane ACL editor made just for that job. FUSE is all about making something look like a traditional filesystem so your traditional tools and skills work with it. If not for that, you might as well use a tar file editor instead of mounting your tar file as a filesystem.

The arguments against acknowledge that value, but just point out that the downside -- the cases where the model breaks and the fact that the permissions aren't really permissions shows -- outweighs it.


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Extended attributes

Posted Apr 21, 2005 7:49 UTC (Thu) by xoddam (subscriber, #2322) [Link]

It seems to me that the special semantics are no more or less than
a user could trick his/her processes to see with other, purely
userspace tools using LD_PRELOAD, such as fakeroot. The
point of FUSE is merely to facilitate the task.

In other words, it's the users' business what semantics they
present to themselves, and not a kernel hacker's problem.

Looking at the application with full generality, you want to
have the flexibility to map users and permissions about in any
way you wish, just as you might remap uids and usernames over
NFS or SMB, or 'squish' root privileges to nothing. And in this
case, the power do do that remapping belongs to the person
running 'mount'.

User-controlled file permission semantics with FUSE

Posted Apr 21, 2005 15:39 UTC (Thu) by giraffedata (subscriber, #1954) [Link]

It seems to me that the special semantics are no more or less than a user could trick his/her processes to see with other, purely userspace tools using LD_PRELOAD

I think the point is just that users presumably would like in some cases both to have access to files with FUSE and have normal semantics. FUSE should provide users that capability if possible.

Also, in the proposal, mounting a filesystem affects other processes -- all those owned by the same user see the mounted files with unconventional permission semantics.


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