linux-kernel - Re: [PATCH 10/17] fsinfo: Allow mount information to be queried [ver #17]

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Date:   Wed, 4 Mar 2020 17:10:58 +0100
From:   Miklos Szeredi <miklos@...redi.hu>
To:     David Howells <dhowells@...hat.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>, Ian Kent <raven@...maw.net>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Christian Brauner <christian@...uner.io>,
        Jann Horn <jannh@...gle.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Linux API <linux-api@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/17] fsinfo: Allow mount information to be queried [ver #17]

On Fri, Feb 21, 2020 at 7:03 PM David Howells <dhowells@...hat.com> wrote:
 +
> +/*
> + * Return information about the submounts relative to path.
> + */
> +int fsinfo_generic_mount_children(struct path *path, struct fsinfo_context *ctx)
> +{
> +       struct fsinfo_mount_child record;
> +       struct mount *m, *child;
> +
> +       if (!path->mnt)
> +               return -ENODATA;
> +
> +       m = real_mount(path->mnt);
> +
> +       rcu_read_lock();
> +       list_for_each_entry_rcu(child, &m->mnt_mounts, mnt_child) {

mnt_mounts is not using _rcu primitives, so why is this rcu safe?

Thanks,
Miklos