linux-kernel - [PATCH 04/12] docs: path-lookup: update do

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Message-Id: <20210126072443.33066-5-foxhlchen@gmail.com>
Date:   Tue, 26 Jan 2021 15:24:35 +0800
From:   Fox Chen <foxhlchen@...il.com>
To:     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: [PATCH 04/12] docs: path-lookup: update do_last() part

traling_symlink() was merged into lookup_last, do_last().

do_last() has later been split into open_last_lookups()
and do_open().

see related commit: c5971b8c6354a95c9ee7eb722928af5000bac247

Signed-off-by: Fox Chen <foxhlchen@...il.com>
---
 Documentation/filesystems/path-lookup.rst | 34 +++++++++++------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/Documentation/filesystems/path-lookup.rst b/Documentation/filesystems/path-lookup.rst
index 4e77c8520fa9..1f05b1417a55 100644
--- a/Documentation/filesystems/path-lookup.rst
+++ b/Documentation/filesystems/path-lookup.rst
@@ -496,11 +496,11 @@ 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.
 
 Finally ``path_openat()`` is used for the ``open()`` system call; it
-contains, in support functions starting with "``do_last()``", all the
+contains, in support functions starting with "``open_last_lookups()``", all the
 complexity needed to handle the different subtleties of O_CREAT (with
 or without O_EXCL), final "``/``" characters, and trailing symbolic
 links.  We will revisit this in the final part of this series, which
-focuses on those symbolic links.  "``do_last()``" will sometimes, but
+focuses on those symbolic links.  "``open_last_lookups()``" will sometimes, but
 not always, take ``i_rwsem``, depending on what it finds.
 
 Each of these, or the functions which call them, need to be alert to
@@ -1201,26 +1201,26 @@ symlink.
 This case is handled by the relevant caller of ``link_path_walk()``, such as
 ``path_lookupat()`` using a loop that calls ``link_path_walk()``, and then
 handles the final component.  If the final component is a symlink
-that needs to be followed, then ``trailing_symlink()`` is called to set
-things up properly and the loop repeats, calling ``link_path_walk()``
-again.  This could loop as many as 40 times if the last component of
-each symlink is another symlink.
+that needs to be followed, then ``open_last_lookups()`` and ``do_open()`` is
+called to set things up properly and the loop repeats, calling
+``link_path_walk()`` again.  This could loop as many as 40 times if the last
+component of each symlink is another symlink.
 
 The various functions that examine the final component and possibly
-report that it is a symlink are ``lookup_last()``, ``mountpoint_last()``
-and ``do_last()``, each of which use the same convention as
-``walk_component()`` of returning ``1`` if a symlink was found that needs
-to be followed.
+report that it is a symlink are ``lookup_last()``, ``open_last_lookups()``
+, each of which use the same convention as
+``walk_component()`` of returning ``char *name`` if a symlink was found that
+needs to be followed.
 
-Of these, ``do_last()`` is the most interesting as it is used for
-opening a file.  Part of ``do_last()`` runs with ``i_rwsem`` held and this
-part is in a separate function: ``lookup_open()``.
+Of these, ``open_last_lookups()``, ``do_open()`` is the most interesting as it is
+used for opening a file.  Part of ``open_last_lookups()`` runs with ``i_rwsem``
+held and this part is in a separate function: ``lookup_open()``.
 
-Explaining ``do_last()`` completely is beyond the scope of this article,
-but a few highlights should help those interested in exploring the
-code.
+Explaining ``open_last_lookups()``, ``do_open()`` completely is beyond the scope
+of this article, but a few highlights should help those interested in exploring
+the code.
 
-1. Rather than just finding the target file, ``do_last()`` needs to open
+1. Rather than just finding the target file, ``do_open()`` needs to open
    it.  If the file was found in the dcache, then ``vfs_open()`` is used for
    this.  If not, then ``lookup_open()`` will either call ``atomic_open()`` (if
    the filesystem provides it) to combine the final lookup with the open, or
-- 
2.30.0