linux-kernel - Re: [PATCH 2/5] ext4: Remove outdated comment about lock

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Message-ID: <20090428161353.GJ21950@atrey.karlin.mff.cuni.cz>
Date:	Tue, 28 Apr 2009 18:13:53 +0200
From:	Jan Kara <jack@...e.cz>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...IV.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 2/5] ext4: Remove outdated comment about lock_super()

> ext4_fill_super() is no longer called by read_super(), and it is no
> longer called with the superblock locked.  The
> unlock_super()/lock_super() is no longer present, so this comment is
> entirely superfluous.
  Yes, the comment seems to be out of date.

Acked-by: Jan Kara <jack@...e.cz>

									Honza
> 
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> ---
>  fs/ext4/super.c |    8 --------
>  1 files changed, 0 insertions(+), 8 deletions(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index e20ff9c..e0b0c9f 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -2806,14 +2806,6 @@ no_journal:
>  		goto failed_mount4;
>  	};
>  
> -	/*
> -	 * akpm: core read_super() calls in here with the superblock locked.
> -	 * That deadlocks, because orphan cleanup needs to lock the superblock
> -	 * in numerous places.  Here we just pop the lock - it's relatively
> -	 * harmless, because we are now ready to accept write_super() requests,
> -	 * and aviro says that's the only reason for hanging onto the
> -	 * superblock lock.
> -	 */
>  	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
>  	ext4_orphan_cleanup(sb, es);
>  	EXT4_SB(sb)->s_mount_state &= ~EXT4_ORPHAN_FS;
> -- 
> 1.5.6.3
> 
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