linux-kernel - Re: [PATCH v2 01/12] docs: path-lookup: update follow

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Message-ID: <87k0oz2j0u.fsf@notabene.neil.brown.name>
Date:   Mon, 19 Apr 2021 10:52:01 +1000
From:   NeilBrown <neilb@...e.de>
To:     Fox Chen <foxhlchen@...il.com>
Cc:     Fox Chen <foxhlchen@...il.com>, corbet@....net,
        vegard.nossum@...cle.com, viro@...iv.linux.org.uk,
        rdunlap@...radead.org, grandmaster@...klimov.de,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v2 01/12] docs: path-lookup: update follow_managed() part

On Tue, Mar 16 2021, Fox Chen wrote:

> No follow_managed() anymore, handle_mounts(),
> traverse_mounts(), will do the job.
> see commit 9deed3ebca24 ("new helper: traverse_mounts()")
>
> Signed-off-by: Fox Chen <foxhlchen@...il.com>
> ---
>  Documentation/filesystems/path-lookup.rst | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/filesystems/path-lookup.rst b/Documentation/filesystems/path-lookup.rst
> index c482e1619e77..d07766375e13 100644
> --- a/Documentation/filesystems/path-lookup.rst
> +++ b/Documentation/filesystems/path-lookup.rst
> @@ -448,10 +448,11 @@ described.  If it finds a ``LAST_NORM`` component it first calls
>  filesystem to revalidate the result if it is that sort of filesystem.
>  If that doesn't get a good result, it calls "``lookup_slow()``" which
>  takes ``i_rwsem``, rechecks the cache, and then asks the filesystem
> -to find a definitive answer.  Each of these will call
> -``follow_managed()`` (as described below) to handle any mount points.
> +to find a definitive answer.
>  
> -In the absence of symbolic links, ``walk_component()`` creates a new
> +As the last step of ``walk_component()``, ``step_into()`` will be called either
> +directly from walk_component() or from handle_dots().  It calls
> +``handle_mount()``, to check and handle mount points, in which a new

Typo - it is "handle_mounts", not "handle_mount"

With that fixed:
  Reviewed-by: NeilBrown <neilb@...e.de>

Thanks,
NeilBrown


>  ``struct path`` containing a counted reference to the new dentry and a
>  reference to the new ``vfsmount`` which is only counted if it is
>  different from the previous ``vfsmount``.  It then calls
> @@ -535,8 +536,7 @@ covered in greater detail in autofs.txt in the Linux documentation
>  tree, but a few notes specifically related to path lookup are in order
>  here.
>  
> -The Linux VFS has a concept of "managed" dentries which is reflected
> -in function names such as "``follow_managed()``".  There are three
> +The Linux VFS has a concept of "managed" dentries.  There are three
>  potentially interesting things about these dentries corresponding
>  to three different flags that might be set in ``dentry->d_flags``:
>  
> -- 
> 2.30.2

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