linux-kernel - Re: [PATCH] vfs: Remove the unnecessary protect.

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Message-ID: <20130415144222.GI2299@quack.suse.cz>
Date:	Mon, 15 Apr 2013 16:42:22 +0200
From:	Jan Kara <jack@...e.cz>
To:	majianpeng <majianpeng@...il.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] vfs: Remove the unnecessary protect.

On Tue 09-04-13 16:06:39, majianpeng wrote:
> After allocating a inode,it don't chain in superblock.At this time,it
> won't be used by others.So it make no sense to protect there.
  Something (likely your mailer) has mangled whitespace in your patch.
Please submit patches with a program that preserves whitespace (preferred)
or use text/plain attachments.

Also I don't think the argument for removing i_lock locking is as simple.
Without the lock, i_state initialization can be speculatively performed
earlier / later wrt other instructions by the CPU so it's not clear this
cannot cause problems to some of the callers.

								Honza

> Signed-off-by: Jianpeng Ma <majianpeng@...il.com>
> ---
> fs/inode.c | 2 --
> 1 file changed, 2 deletions(-)
> 
> diff --git a/fs/inode.c b/fs/inode.c
> index f5f7c06..1d7b0dd 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -906,9 +906,7 @@ struct inode *new_inode_pseudo(struct super_block *sb)
> struct inode *inode = alloc_inode(sb);
> 
> if (inode) {
> - spin_lock(&inode->i_lock);
> inode->i_state = 0;
> - spin_unlock(&inode->i_lock);
> INIT_LIST_HEAD(&inode->i_sb_list);
> }
> return inode;
> -- 
> 1.8.2.rc2.4.g7799588
> 
> --
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-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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