From: NeilBrown <neilb@suse.de>
To: Fox Chen <foxhlchen@gmail.com>
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: Re: [PATCH v2 03/12] docs: path-lookup: update path_mountpoint() part
Date: Mon, 19 Apr 2021 11:03:51 +1000 [thread overview]
Message-ID: <87eef72ih4.fsf@notabene.neil.brown.name> (raw)
In-Reply-To: <20210316054727.25655-4-foxhlchen@gmail.com>
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On Tue, Mar 16 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 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 a29d714431a3..b6a301b78121 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 further
I would say "subsequent" rather than "further".
Either way:
Reviewed-by: NeilBrown <neilb@suse.de>
Thanks,
NeilBrown
> +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
> --
> 2.30.2
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next prev parent reply other threads:[~2021-04-19 1:04 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-16 5:47 [PATCH v2 00/12] docs: path-lookup: Update pathlookup docs Fox Chen
2021-03-16 5:47 ` [PATCH v2 01/12] docs: path-lookup: update follow_managed() part Fox Chen
2021-04-19 0:52 ` NeilBrown
2021-04-19 2:17 ` Matthew Wilcox
2021-04-19 2:33 ` Fox Chen
2021-04-19 3:25 ` Matthew Wilcox
2021-04-19 3:33 ` Fox Chen
2021-04-19 19:22 ` Jonathan Corbet
2021-04-20 1:12 ` Fox Chen
2021-03-16 5:47 ` [PATCH v2 02/12] docs: path-lookup: update path_to_nameidata() part Fox Chen
2021-04-19 1:00 ` NeilBrown
2021-03-16 5:47 ` [PATCH v2 03/12] docs: path-lookup: update path_mountpoint() part Fox Chen
2021-04-19 1:03 ` NeilBrown [this message]
2021-03-16 5:47 ` [PATCH v2 04/12] docs: path-lookup: update do_last() part Fox Chen
2021-04-19 1:17 ` NeilBrown
2021-03-16 5:47 ` [PATCH v2 05/12] docs: path-lookup: remove filename_mountpoint Fox Chen
2021-04-19 1:20 ` NeilBrown
2021-03-16 5:47 ` [PATCH v2 06/12] docs: path-lookup: Add macro name to symlink limit description Fox Chen
2021-04-19 1:22 ` NeilBrown
2021-03-16 5:47 ` [PATCH v2 07/12] docs: path-lookup: i_op->follow_link replaced with i_op->get_link Fox Chen
2021-04-19 1:28 ` NeilBrown
2021-03-16 5:47 ` [PATCH v2 08/12] docs: path-lookup: update i_op->put_link and cookie description Fox Chen
2021-04-19 1:37 ` NeilBrown
2021-03-16 5:47 ` [PATCH v2 09/12] docs: path-lookup: no get_link() Fox Chen
2021-04-19 1:41 ` NeilBrown
2021-03-16 5:47 ` [PATCH v2 10/12] docs: path-lookup: update WALK_GET, WALK_PUT desc Fox Chen
2021-04-19 1:47 ` NeilBrown
2021-03-16 5:47 ` [PATCH v2 11/12] docs: path-lookup: update get_link() ->follow_link description Fox Chen
2021-04-19 1:54 ` NeilBrown
2021-03-16 5:47 ` [PATCH v2 12/12] docs: path-lookup: update symlink description Fox Chen
2021-04-19 1:59 ` NeilBrown
2021-04-19 2:34 ` Fox Chen
2021-04-13 21:18 ` [PATCH v2 00/12] docs: path-lookup: Update pathlookup docs Jonathan Corbet
2021-04-13 22:26 ` NeilBrown
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