linux-kernel - Re: [PATCH 03/12] docs: path-lookup: update path

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Message-ID: <87bld9hh8s.fsf@notabene.neil.brown.name>
Date:   Thu, 28 Jan 2021 14:28:51 +1100
From:   NeilBrown <neilb@...e.de>
To:     Fox Chen <foxhlchen@...il.com>, corbet@....net,
        vegard.nossum@...cle.com, viro@...iv.linux.org.uk,
        rdunlap@...radead.org, grandmaster@...klimov.de
Cc:     Fox Chen <foxhlchen@...il.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/12] docs: path-lookup: update path_mountpoint() part

On Tue, Jan 26 2021, Fox Chen wrote:

> path_mountpoint() doesn't exist anymore. Have been folded
> into path_lookup_at when flag is set with LOOKUP_MOUNTPOINT.
> check out commit:161aff1d93abf0e5b5e9dbca88928998c155f677
>
> Signed-off-by: Fox Chen <foxhlchen@...il.com>
> ---
>  Documentation/filesystems/path-lookup.rst | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/filesystems/path-lookup.rst b/Documentation/filesystems/path-lookup.rst
> index 2ad96e1e3c49..4e77c8520fa9 100644
> --- a/Documentation/filesystems/path-lookup.rst
> +++ b/Documentation/filesystems/path-lookup.rst
> @@ -492,7 +492,8 @@ not try to revalidate the mounted filesystem.  It effectively
>  contains, through a call to ``mountpoint_last()``, an alternate
>  implementation of ``lookup_slow()`` which skips that step.  This is
>  important when unmounting a filesystem that is inaccessible, such as
> -one provided by a dead NFS server.
> +one provided by a dead NFS server.  In the current kernel, path_mountpoint
> +has been merged into ``path_lookup_at()`` with a new flag LOOKUP_MOUNTPOINT.

You've taken a very different approach here.  Rather than re-telling the
story you have added a note (like a foot-note) that the details have
changed, withouy trying to re-weave the story.  The is easier to get
right, but doesn't produce as nice a result.

Maybe this is a good approach, it depends on how much effort you are
willing/able to spend on the task.

IF you do stick with this approach:  it is "path_lookupat", not
"path_lookup_at".

NeilBrown


>  
>  Finally ``path_openat()`` is used for the ``open()`` system call; it
>  contains, in support functions starting with "``do_last()``", all the
> -- 
> 2.30.0

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