linux-kernel - Re: [RFC] simple_recursive

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Message-ID: <20191115221037.GW26530@ZenIV.linux.org.uk>
Date:   Fri, 15 Nov 2019 22:10:37 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Greg KH <gregkh@...uxfoundation.org>, yu kuai <yukuai3@...wei.com>,
        rafael@...nel.org, oleg@...hat.com, mchehab+samsung@...nel.org,
        corbet@....net, tytso@....edu, jmorris@...ei.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        zhengbin13@...wei.com, yi.zhang@...wei.com,
        chenxiang66@...ilicon.com, xiexiuqi@...wei.com
Subject: Re: [RFC] simple_recursive_removal()

On Fri, Nov 15, 2019 at 04:26:09PM -0500, Steven Rostedt wrote:
> On Fri, 15 Nov 2019 21:18:20 +0000
> Al Viro <viro@...iv.linux.org.uk> wrote:
> 
> > OK... debugfs and tracefs definitely convert to that; so do, AFAICS,
> > spufs and selinuxfs, and I wouldn't be surprised if it could be
> > used in a few more places...  securityfs, almost certainly qibfs,
> > gadgetfs looks like it could make use of that.  Maybe subrpc
> > as well, but I'll need to look in details.  configfs won't,
> > unfortunately...
> 
> Thanks Al for looking into this.
> 
> I'll try to test it in tracefs, and see if anything breaks. But
> probably wont get to it till next week.

I'll probably throw that into #next.dcache - if nothing else,
that cuts down on the size of patch converting d_subdirs/d_child
from list to hlist...

Need to get some sleep first, though - only 5 hours today, so
I want to take another look at that thing tomorrow morning -
I don't trust my ability to spot obvious bugs right now... ;-/

Oh, well - that at least might finally push the old "kernel-side
rm -rf done right" pile of half-baked patches into more useful
state, probably superseding most of them.