Re: [fuse-devel] Should ACLs updates affect permission bits?

[Feng S. <ste...@gm...>]

Hi Miklos,

Yes, I think it will be nice to keep all xattrs opaque to FUSE kernel
because this will keep a clean and unitifed kernel/user space
interface, but it will still be necessary to invalid the inode by
fuse_invalidate_attr() after setxattr. This will make the kernel
reload the "i_mode" to the user space ACL implementations possible.


On Tue, Jan 22, 2013 at 9:50 PM, Miklos Szeredi <mi...@sz...> wrote:
> On Tue, Jan 22, 2013 at 3:23 AM, Nikolaus Rath <Nik...@ra...> wrote:
>> Yes, fuse does not reivalidate the file mode after setxattr() calls (at
>> least with Kernel 3.2 and fuse 2.9).
>>
>> I'll patch up some handler code in my file system based on
>> posix_acl_equiv_mode (thanks for the link!) and an explicit
>> fuse_lowlevel_notify_inval_inode call.
>>
>>
>> I agree that FUSE should call posix_acl_equiv_mode(), followed by
>> setattr() and (only if necessary) setxattr().
>
> FUSE kernel code doesn't support POSIX ACL's at all presently.
>
> Adding ACL support would make sense, and with that the reported bug
> would be fixed.
>
> With ACL support turned off (as presently) then I think the current
> behavior is fine: the kernel should just pass unmodified xattrs to
> userspace.
>
> Thanks,
> Miklos
>
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