From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: Jan Kara <jack@suse.cz>
Cc: linux-ext4@vger.kernel.org,
harshad shirwadkar <harshadshirwadkar@gmail.com>
Subject: Re: [PATCH 3/8] ext4: Protect superblock modifications with a buffer lock
Date: Thu, 17 Dec 2020 10:56:30 -0500 [thread overview]
Message-ID: <X9t/rpL3HQb4+ecl@mit.edu> (raw)
In-Reply-To: <20201216101844.22917-4-jack@suse.cz>
On Wed, Dec 16, 2020 at 11:18:39AM +0100, Jan Kara wrote:
> Protect all superblock modifications (including checksum computation)
> with a superblock buffer lock. That way we are sure computed checksum
> matches current superblock contents (a mismatch could cause checksum
> failures in nojournal mode or if an unjournalled superblock update races
> with a journalled one). Also we avoid modifying superblock contents
> while it is being written out (which can cause DIF/DIX failures if we
> are running in nojournal mode).
>
> Signed-off-by: Jan Kara <jack@suse.cz>
Thanks, applied.
- Ted
next prev parent reply other threads:[~2020-12-17 15:57 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-16 10:18 [PATCH 0/8 v2 PARTIAL] ext4: Fix error handling Jan Kara
2020-12-16 10:18 ` [PATCH 1/8] ext4: Combine ext4_handle_error() and save_error_info() Jan Kara
2020-12-17 15:50 ` Theodore Y. Ts'o
2020-12-16 10:18 ` [PATCH 2/8] ext4: Drop sync argument of ext4_commit_super() Jan Kara
2020-12-17 15:51 ` Theodore Y. Ts'o
2020-12-16 10:18 ` [PATCH 3/8] ext4: Protect superblock modifications with a buffer lock Jan Kara
2020-12-17 15:56 ` Theodore Y. Ts'o [this message]
2020-12-16 10:18 ` [PATCH 4/8] ext4: Save error info to sb through journal if available Jan Kara
2020-12-17 15:58 ` Theodore Y. Ts'o
2020-12-16 10:18 ` [PATCH 5/8] ext4: Use sbi instead of EXT4_SB(sb) in ext4_update_super() Jan Kara
2020-12-17 15:59 ` Theodore Y. Ts'o
2020-12-16 10:18 ` [PATCH 6/8] ext4: Fix deadlock with fs freezing and EA inodes Jan Kara
2020-12-17 16:01 ` Theodore Y. Ts'o
2020-12-16 10:18 ` [PATCH 7/8] ext4: Fix superblock checksum failure when setting password salt Jan Kara
2020-12-17 16:02 ` Theodore Y. Ts'o
2020-12-16 10:18 ` [PATCH 8/8] ext4: Drop ext4_handle_dirty_super() Jan Kara
2020-12-17 16:08 ` Theodore Y. Ts'o
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