linux-ext4 - Re: [PATCH v2 0/6] fs: Fix directory corruption when moving directories

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Message-Id: <20230602-abmelden-zarte-405e2540fde2@brauner>
Date:   Fri,  2 Jun 2023 15:05:13 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Jan Kara <jack@...e.cz>
Cc:     Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, Miklos Szeredi <miklos@...redi.hu>,
        "Darrick J. Wong" <djwong@...nel.org>, Ted Tso <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [PATCH v2 0/6] fs: Fix directory corruption when moving directories

On Thu, 01 Jun 2023 12:58:20 +0200, Jan Kara wrote:
> this patch set fixes a problem with cross directory renames originally reported
> in [1]. To quickly sum it up some filesystems (so far we know at least about
> ext4, udf, f2fs, ocfs2, likely also reiserfs, gfs2 and others) need to lock the
> directory when it is being renamed into another directory. This is because we
> need to update the parent pointer in the directory in that case and if that
> races with other operation on the directory (in particular a conversion from
> one directory format into another), bad things can happen.
> 
> [...]

I've picked this up to get it into -next. I've folded the following fix
for the missing { into [4/6].

---

Applied to the vfs.rename.locking branch of the vfs/vfs.git tree.
Patches in the vfs.rename.locking 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.

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

[1/6] ext4: Remove ext4 locking of moved directory
      https://git.kernel.org/vfs/vfs/c/3658840cd363
[2/6] Revert "udf: Protect rename against modification of moved directory"
      https://git.kernel.org/vfs/vfs/c/7517ce5dc4d6
[3/6] Revert "f2fs: fix potential corruption when moving a directory"
      https://git.kernel.org/vfs/vfs/c/cde3c9d7e2a3
[4/6] fs: Establish locking order for unrelated directories
      https://git.kernel.org/vfs/vfs/c/f23ce7571853
[5/6] fs: Lock moved directories
      https://git.kernel.org/vfs/vfs/c/28eceeda130f
[6/6] fs: Restrict lock_two_nondirectories() to non-directory inodes
      https://git.kernel.org/vfs/vfs/c/afb4adc7c3ef