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docs: path-lookup: update path_to_nameidata() part 

No path_to_namei() anymore, step_into() will be called.
Related commit: commit c99687a03a ("fold path_to_nameidata()
into its only remaining caller")

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-3-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Fox Chen 2021-05-27 17:16:07 +08:00 committed by Jonathan Corbet
parent 993b892610
commit 084c86837a
1 changed files with 6 additions and 5 deletions
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11
Documentation/filesystems/path-lookup.rst
View File

@ -453,11 +453,12 @@ to find a definitive answer.
As the last step of ``walk_component()``, ``step_into()`` will be called either
directly from walk_component() or from handle_dots(). It calls
``handle_mounts()``, to check and handle mount points, in which a new
``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
``path_to_nameidata()`` to install the new ``struct path`` in the
``struct nameidata`` and drop the unneeded references.
``struct path`` is created 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``. Then if there is
a symbolic link, ``step_into()`` calls ``pick_link()`` to deal with it,
otherwise it installs the new ``struct path`` in the ``struct nameidata``, and
drops the unneeded references.
This "hand-over-hand" sequencing of getting a reference to the new
dentry before dropping the reference to the previous dentry may