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Re: [RFC][PATCH 0/4] Enhanced file stat system call

From One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>
Newsgroups linux.kernel
Subject Re: [RFC][PATCH 0/4] Enhanced file stat system call
Date 2016-11-17 19:00 +0100
Message-ID <sEymf-3v8-99@gated-at.bofh.it> (permalink)
References <sEvol-1nz-5@gated-at.bofh.it>
Organization Intel Corporation

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>  (2) Lightweight stat (AT_STATX_DONT_SYNC): Ask for just those details of
>      interest, and allow a network fs to approximate anything not of
>      interest, without going to the server.
> 
>  (3) Heavyweight stat (AT_STATX_FORCE_SYNC): Force a network fs to flush
>      buffers and go to the server, even if it thinks its cached attributes
>      are up to date.

That seems an odd way to do it. Wouldn't it be cleaner and more flexible
to give a timestamp of the oldest time you consider acceptable (and
obviously passing 0 indicates whatever you have)

>  (4) Allow the filesystem to indicate what it can/cannot provide: A
>      filesystem can now say it doesn't support a standard stat feature if
>      that isn't available.
> 
>  (5) Make the fields a consistent size on all arches, and make them large.
> 
>  (6) Can be extended by using more request flags and using up the padding
>      space in the statx struct.
> 
> Note that no lstat() equivalent is required as that can be implemented
> through statx() with atflag == 0.  There is also no fstat() equivalent as
> that can be implemented through statx() with filename == NULL and the
> relevant fd passed as dfd.

and dfd + a name gives you fstatat() ? The cover note could be clearer on
this.

Should the fields really be split the way they are for times rather than
a struct for each one so you can write code generically to handle one of
those rather than having to have a 4 way switch statement all the time.

Another attribute that would be nice (but migt need some trivial device
layer tweaking) would be STATX_ATTR_VOLATILE for filesystems that will
probably evaporate on a reboot. That's useful information for tools like
installers and also for sanity checking things like backup paths.

Remote needs to have clear semantics: is ext4fs over nbd 'remote' for
example ?

Alan

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[RFC][PATCH 0/4] Enhanced file stat system call David Howells <dhowells@redhat.com> - 2016-11-17 15:00 +0100
  Re: [RFC][PATCH 0/4] Enhanced file stat system call David Howells <dhowells@redhat.com> - 2016-11-17 18:10 +0100
  Re: [RFC][PATCH 0/4] Enhanced file stat system call David Howells <dhowells@redhat.com> - 2016-11-17 18:10 +0100
    Re: [RFC][PATCH 0/4] Enhanced file stat system call bfields@fieldses.org (J. Bruce Fields) - 2016-11-17 21:10 +0100
      Re: [RFC][PATCH 0/4] Enhanced file stat system call Andreas Dilger <adilger@dilger.ca> - 2016-11-18 03:50 +0100
        Re: [RFC][PATCH 0/4] Enhanced file stat system call NeilBrown <neilb@suse.com> - 2016-11-18 05:40 +0100
    Re: [RFC][PATCH 0/4] Enhanced file stat system call One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-11-18 14:50 +0100
      Re: [RFC][PATCH 0/4] Enhanced file stat system call David Howells <dhowells@redhat.com> - 2016-11-18 14:50 +0100
  Re: [RFC][PATCH 0/4] Enhanced file stat system call Michael Kerrisk <mtk.manpages@gmail.com> - 2016-11-17 18:20 +0100
  [PATCH 3/4] statx: NFS: Return enhanced file attributes David Howells <dhowells@redhat.com> - 2016-11-17 18:20 +0100
  [PATCH 2/4] statx: Ext4: Return enhanced file attributes David Howells <dhowells@redhat.com> - 2016-11-17 18:20 +0100
    Re: [PATCH 2/4] statx: Ext4: Return enhanced file attributes Andreas Dilger <adilger@dilger.ca> - 2016-11-18 04:40 +0100
  [PATCH 4/4] statx: AFS: Return enhanced file attributes David Howells <dhowells@redhat.com> - 2016-11-17 18:20 +0100
    Re: [PATCH 4/4] statx: AFS: Return enhanced file attributes Andreas Dilger <adilger@dilger.ca> - 2016-11-18 09:30 +0100
      Re: [PATCH 4/4] statx: AFS: Return enhanced file attributes David Howells <dhowells@redhat.com> - 2016-11-18 09:50 +0100
  Re: [RFC][PATCH 0/4] Enhanced file stat system call One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-11-17 19:00 +0100
  Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Dave Chinner <david@fromorbit.com> - 2016-11-18 00:50 +0100
    Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available Andreas Dilger <adilger@dilger.ca> - 2016-11-18 04:30 +0100
      Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 11:00 +0100
      Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Dave Chinner <david@fromorbit.com> - 2016-11-18 23:10 +0100
        Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-19 00:00 +0100
          Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Dave Chinner <david@fromorbit.com> - 2016-11-19 23:50 +0100
            Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-22 11:40 +0100
              Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Jeff Layton <jlayton@redhat.com> - 2016-11-22 15:00 +0100
              Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Dave Chinner <david@fromorbit.com> - 2016-11-22 22:00 +0100
          Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-11-21 15:40 +0100
            Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Dave Chinner <david@fromorbit.com> - 2016-11-21 21:50 +0100
    Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 10:40 +0100
      Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Jeff Layton <jlayton@poochiereds.net> - 2016-11-18 18:20 +0100
        Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 19:10 +0100
          Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Jeff Layton <jlayton@redhat.com> - 2016-11-18 20:00 +0100
            Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 20:10 +0100
    Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 10:50 +0100
      Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Dave Chinner <david@fromorbit.com> - 2016-11-18 22:50 +0100
        Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 23:30 +0100
    Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 11:30 +0100
      Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Dave Chinner <david@fromorbit.com> - 2016-11-18 22:30 +0100
        Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 22:50 +0100
          Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Dave Chinner <david@fromorbit.com> - 2016-11-18 23:20 +0100
            Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> - 2016-11-19 11:30 +0100
  Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 09:50 +0100
    Re: [PATCH 1/4] statx: Add a system call to make enhanced file info  available Jeff Layton <jlayton@redhat.com> - 2016-11-18 13:10 +0100
  Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available David Howells <dhowells@redhat.com> - 2016-11-18 10:00 +0100
    Re: [PATCH 1/4] statx: Add a system call to make enhanced file info available Andreas Dilger <adilger@dilger.ca> - 2016-11-18 10:30 +0100

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