linux-kernel - Re: [PATCH 09/17] fs: Make last_ino, iunique independent of inode

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Message-Id: <20100929215302.1f4536be.akpm@linux-foundation.org>
Date:	Wed, 29 Sep 2010 21:53:02 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/17] fs: Make last_ino, iunique independent of
 inode_lock

On Wed, 29 Sep 2010 22:18:41 +1000 Dave Chinner <david@...morbit.com> wrote:

> From: Nick Piggin <npiggin@...e.de>
> 
> Before removing the inode_lock, we need to make the last_ino  and iunique
> counters independent of the inode_lock. last_ino can be trivially converted to
> an atomic variable, while the iunique counter needs a new lock nested inside
> the inode_lock to provide the same protection that the inode_lock previously
> provided.
> 
>
> ...
>
> +static int test_inode_iunique(struct super_block * sb, struct hlist_head *head, unsigned long ino)
> +{
> +	struct hlist_node *node;
> +	struct inode * inode = NULL;
> +
> +	spin_lock(&inode_hash_lock);
> +	hlist_for_each_entry(inode, node, head, i_hash) {
> +		if (inode->i_ino == ino && inode->i_sb == sb) {
> +			spin_unlock(&inode_hash_lock);
> +			return 0;
> +		}
> +	}
> +	spin_unlock(&inode_hash_lock);
> +	return 1;
> +}

Please run all the patches through checkpatch.

Please document this function.  Why does it exist?  What does it do? 
How does it do it?  Try to improve the code!

>
> ...
>

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