linux-kernel - Re: [PATCH 1/2 v2] fs/proc: show correct device and inode numbers in /proc/pid/maps

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Date:   Thu, 14 Dec 2023 11:55:04 +0100
From:   Christian Brauner <brauner@...nel.org>
To:     Andrei Vagin <avagin@...gle.com>
Cc:     Christian Brauner <brauner@...nel.org>,
        linux-kernel@...r.kernel.org,
        Alexander Mikhalitsyn <alexander@...alicyn.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel@...r.kernel.org,
        overlayfs <linux-unionfs@...r.kernel.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Amir Goldstein <amir73il@...il.com>
Subject: Re: [PATCH 1/2 v2] fs/proc: show correct device and inode numbers in /proc/pid/maps

On Wed, 13 Dec 2023 22:44:38 -0800, Andrei Vagin wrote:
> /proc/pid/maps shows device and inode numbers of vma->vm_file-s. Here is
> an issue. If a mapped file is on a stackable file system (e.g.,
> overlayfs), vma->vm_file is a backing file whose f_inode is on the
> underlying filesystem. To show correct numbers, we need to get a user
> file and shows its numbers. The same trick is used to show file paths in
> /proc/pid/maps.
> 
> [...]

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.misc

[1/2] fs/proc: show correct device and inode numbers in /proc/pid/maps
      https://git.kernel.org/vfs/vfs/c/26b50595e169
[2/2] selftests/overlayfs: verify device and inode numbers in /proc/pid/maps
      https://git.kernel.org/vfs/vfs/c/22d9cfff4639