lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Date:   Thu, 21 Dec 2017 05:40:00 +0000
From:   Al Viro <>
To:     Linus Torvalds <>
Cc:     NeilBrown <>,
        "J. Bruce Fields" <>,
        Trond Myklebust <>,
        Anna Schumaker <>,
        linux-fsdevel <>,
        Linux Kernel Mailing List <>,
        Linux NFS Mailing List <>
Subject: Re: [PATCH/RFC] VFS: don't keep disconnected dentries on d_anon

On Wed, Dec 20, 2017 at 04:57:28PM -0800, Linus Torvalds wrote:
> On Wed, Dec 20, 2017 at 2:45 PM, NeilBrown <> wrote:
> >
> > We could just leave the code unchanged, but apart from that being
> > potentially confusing, the (unfair) bit-spin-lock which protects
> > s_anon can become a bottle neck when lots of disconnected dentries are
> > being created.
> >
> > So this patch renames s_anon to s_roots, and stops storing
> > disconnected dentries on the list.  Only dentries obtained with
> > d_obtain_root() are now stored on this list.  There are many fewer of
> > these (only NFS and NILFS2 use the call, and only during filesystem
> > mount) so contention on the bit-lock will not be a problem.
> Thanks, Neil. This is much nicer than the magical special case patch
> for s_anon bitlock.
> Al, I'm going to assume I'll get this through your vfs tree (with
> whatever edits from the comments people made).


I've got sidetracked digging through the Lustre mess with dcache (revalidation
stuff, again), will finish once I get some sleep.  In any case, I like that
variant; it's definitely going to be applied.

Powered by blists - more mailing lists