linux-kernel - Re: [PATCH v5 7/8] man/man2/open_tree{,_attr}.2: document new open_tree

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Message-ID: <5ukckeqipdkz6aigdy7rmtsmy5zav5x4rw2hrgbxiwfflrcmgb@jy7yr34cwyat>
Date: Wed, 1 Oct 2025 20:02:16 +0200
From: Alejandro Colomar <alx@...nel.org>
To: Aleksa Sarai <cyphar@...har.com>
Cc: Askar Safin <safinaskar@...il.com>, brauner@...nel.org, 
	dhowells@...hat.com, g.branden.robinson@...il.com, jack@...e.cz, 
	linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-man@...r.kernel.org, mtk.manpages@...il.com, viro@...iv.linux.org.uk
Subject: Re: [PATCH v5 7/8] man/man2/open_tree{,_attr}.2: document new
 open_tree_attr() API

Hi Aleksa,

On Wed, Oct 01, 2025 at 05:35:45PM +1000, Aleksa Sarai wrote:
> On 2025-10-01, Askar Safin <safinaskar@...il.com> wrote:
> > Aleksa Sarai <cyphar@...har.com>:
> > > +mntfd2 = open_tree(mntfd1, "", OPEN_TREE_CLONE,
> > > +                   &attr, sizeof(attr));
> > 
> > Your whole so-called "open_tree_attr example" doesn't contain any open_tree_attr
> > calls. :)
> > 
> > I think you meant open_tree_attr here.
> 
> Oops.
> 
> > 
> > > +\&
> > > +/* Create a new copy with the id-mapping cleared */
> > > +memset(&attr, 0, sizeof(attr));
> > > +attr.attr_clr = MOUNT_ATTR_IDMAP;
> > > +mntfd3 = open_tree(mntfd1, "", OPEN_TREE_CLONE,
> > > +                   &attr, sizeof(attr));
> > 
> > And here.
> 
> Oops x2.
> 
> > Otherwise your whole patchset looks good. Add to whole patchset:
> > Reviewed-by: Askar Safin <safinaskar@...il.com>

I've applied the patch, with the following amendment:

	diff --git i/man/man2/open_tree.2 w/man/man2/open_tree.2
	index 8b48f3b78..f6f2fbecd 100644
	--- i/man/man2/open_tree.2
	+++ w/man/man2/open_tree.2
	@@ -683,14 +683,14 @@ .SS open_tree_attr()
	 .\" Using .attr_clr is not strictly necessary but makes the intent clearer.
	 attr.attr_set = MOUNT_ATTR_IDMAP;
	 attr.userns_fd = nsfd2;
	-mntfd2 = open_tree(mntfd1, "", OPEN_TREE_CLONE,
	-                   &attr, sizeof(attr));
	+mntfd2 = open_tree_attr(mntfd1, "", OPEN_TREE_CLONE,
	+                        &attr, sizeof(attr));
	 \&
	 /* Create a new copy with the id-mapping cleared */
	 memset(&attr, 0, sizeof(attr));
	 attr.attr_clr = MOUNT_ATTR_IDMAP;
	-mntfd3 = open_tree(mntfd1, "", OPEN_TREE_CLONE,
	-                   &attr, sizeof(attr));
	+mntfd3 = open_tree_attr(mntfd1, "", OPEN_TREE_CLONE,
	+                        &attr, sizeof(attr));
	 .EE
	 .in
	 .P


(Hopefully I got it right.)


Cheers,
Alex

> 
> -- 
> Aleksa Sarai
> Senior Software Engineer (Containers)
> SUSE Linux GmbH
> https://www.cyphar.com/



-- 
<https://www.alejandro-colomar.es>
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