From: Fox Chen <foxhlchen@gmail.com>
To: neilb@suse.de
Cc: Fox Chen <foxhlchen@gmail.com>,
corbet@lwn.net, vegard.nossum@oracle.com,
viro@zeniv.linux.org.uk, rdunlap@infradead.org,
grandmaster@al2klimov.de, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org
Subject: [PATCH v3 03/13] docs: path-lookup: update path_mountpoint() part
Date: Thu, 27 May 2021 17:16:08 +0800 [thread overview]
Message-ID: <20210527091618.287093-4-foxhlchen@gmail.com> (raw)
In-Reply-To: <20210527091618.287093-1-foxhlchen@gmail.com>
path_mountpoint() doesn't exist anymore. Have been folded
into path_lookup_at when flag is set with LOOKUP_MOUNTPOINT.
Check commit: commit 161aff1d93abf0e ("LOOKUP_MOUNTPOINT: fold
path_mountpointat() into path_lookupat()")
Signed-off-by: Fox Chen <foxhlchen@gmail.com>
---
Documentation/filesystems/path-lookup.rst | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/Documentation/filesystems/path-lookup.rst b/Documentation/filesystems/path-lookup.rst
index 6ea0880fb982..652d3284f178 100644
--- a/Documentation/filesystems/path-lookup.rst
+++ b/Documentation/filesystems/path-lookup.rst
@@ -472,7 +472,7 @@ Handling the final component
``nd->last_type`` to refer to the final component of the path. It does
not call ``walk_component()`` that last time. Handling that final
component remains for the caller to sort out. Those callers are
-``path_lookupat()``, ``path_parentat()``, ``path_mountpoint()`` and
+``path_lookupat()``, ``path_parentat()`` and
``path_openat()`` each of which handles the differing requirements of
different system calls.
@@ -488,12 +488,10 @@ perform their operation.
object is wanted such as by ``stat()`` or ``chmod()``. It essentially just
calls ``walk_component()`` on the final component through a call to
``lookup_last()``. ``path_lookupat()`` returns just the final dentry.
-
-``path_mountpoint()`` handles the special case of unmounting which must
-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
+It is worth noting that when flag ``LOOKUP_MOUNTPOINT`` is set,
+``path_lookupat()`` will unset LOOKUP_JUMPED in nameidata so that in the
+subsequent path traversal ``d_weak_revalidate()`` won't be called.
+This is important when unmounting a filesystem that is inaccessible, such as
one provided by a dead NFS server.
Finally ``path_openat()`` is used for the ``open()`` system call; it
--
2.31.1
next prev parent reply other threads:[~2021-05-27 9:17 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-27 9:16 [PATCH v3 00/13] docs: path-lookup: Update pathlookup docs Fox Chen
2021-05-27 9:16 ` [PATCH v3 01/13] docs: path-lookup: update follow_managed() part Fox Chen
2021-05-27 9:16 ` [PATCH v3 02/13] docs: path-lookup: update path_to_nameidata() part Fox Chen
2021-05-27 9:16 ` Fox Chen [this message]
2021-05-27 9:16 ` [PATCH v3 04/13] docs: path-lookup: update do_last() part Fox Chen
2021-05-27 9:16 ` [PATCH v3 05/13] docs: path-lookup: remove filename_mountpoint Fox Chen
2021-05-27 9:16 ` [PATCH v3 06/13] docs: path-lookup: Add macro name to symlink limit description Fox Chen
2021-05-27 9:16 ` [PATCH v3 07/13] docs: path-lookup: i_op->follow_link replaced with i_op->get_link Fox Chen
2021-05-27 9:16 ` [PATCH v3 08/13] docs: path-lookup: update i_op->put_link and cookie description Fox Chen
2021-05-27 9:16 ` [PATCH v3 09/13] docs: path-lookup: no get_link() Fox Chen
2021-05-27 9:16 ` [PATCH v3 10/13] docs: path-lookup: update WALK_GET, WALK_PUT desc Fox Chen
2021-06-17 22:31 ` NeilBrown
2021-05-27 9:16 ` [PATCH v3 11/13] docs: path-lookup: update get_link() ->follow_link description Fox Chen
2021-05-27 9:16 ` [PATCH v3 12/13] docs: path-lookup: update symlink description Fox Chen
2021-05-27 9:16 ` [PATCH v3 13/13] docs: path-lookup: use bare function() rather than literals Fox Chen
2021-06-17 22:35 ` [PATCH v3 00/13] docs: path-lookup: Update pathlookup docs NeilBrown
2021-06-18 1:00 ` Fox Chen
2021-06-18 17:39 ` Jonathan Corbet
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210527091618.287093-4-foxhlchen@gmail.com \
--to=foxhlchen@gmail.com \
--cc=corbet@lwn.net \
--cc=grandmaster@al2klimov.de \
--cc=gregkh@linuxfoundation.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=neilb@suse.de \
--cc=rdunlap@infradead.org \
--cc=vegard.nossum@oracle.com \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.