linux-ext4 - Re: [PATCH] ext4, jbd2: add an optimized bmap for the journal inode

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Message-ID: <ZAgVej4bnMLfHKpf@sol.localdomain>
Date:   Tue, 7 Mar 2023 20:56:26 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] ext4, jbd2: add an optimized bmap for the journal inode

On Tue, Mar 07, 2023 at 11:16:15PM -0500, Theodore Ts'o wrote:
> The generic bmap() function exported by the VFS takes locks and does
> checks that are not necessary for the journal inode.  So allow the
> file system to set a journal-optimized bmap function in
> journal->j_bmap.
> 
> The also has the benefit of avoiding some false positives by DEPT.
> 
> Signed-off-by: Theodore Ts'o <tytso@....edu>
> ---
>  fs/ext4/super.c      | 23 +++++++++++++++++++++++
>  fs/jbd2/journal.c    |  9 ++++++---
>  include/linux/jbd2.h |  8 ++++++++
>  3 files changed, 37 insertions(+), 3 deletions(-)
> 

Should this also be marked as a fix for the syzbot report
https://syzkaller.appspot.com/bug?id=e4aaa78795e490421c79f76ec3679006c8ff4cf0 ?

- Eric