Re: [PATCH] fuse: allow umask processing in userspace

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On Sat, 04 Jul 2009, Jean-Pierre André wrote:
> I went through the patches and the tests, and I can
> announce that ntfs-3g is the first fuse-based file system
> which passes the PJD Posix test fully, including the
> Posix ACL parts.

Thanks for testing.

> I used kernel 2.6.29 with your proposed patches applied
> to the fuse client (fuse.ko), and a simplified version of
> the fuse server (fuse-lite), which I upgraded manually
> according to your proposed patches.
> 
> There were only three modifications needed not mentioned
> in your proposal, probably consequences of different
> reference versions :
> - new fields in attr_out and write_in
> - umask not copied from low level context to high level.

This should be fixed in latest CVS.

> I checked the client-server compatibility in the four
> possible associations (new client / old server, etc.),
> but of course both new client and new server are required
> to get the correct permissions on file creation.
> 
> For releasing a file system source compatible with both
> old and new fuse.h, I check whether FUSE_CAP_DONT_MASK
> is defined. From now on, I can release code which will compile
> and run with current fuse (server and file system ready)
> and will benefit from permission fixes when kernels with
> updated fuse client will be released.
> 
> There is just a point which worries me : I cannot understand
> how your client patch deactivates the old code which was
> applying the umask. I would prefer not to discover it the
> hard way...

The

	sb->s_flags |= MS_POSIXACL;

line tells the VFS that it should leave umask applying to the
filesystem.  The flag is misnamed, it really should be "MS_NOMASK" or
something.

Thanks,
Miklos
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