linux-kernel - Re: [PATCH 04/17] fs: icache lock i

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Message-ID: <20101001055433.GC32349@infradead.org>
Date:	Fri, 1 Oct 2010 01:54:33 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/17] fs: icache lock i_state

> +		spin_lock(&inode->i_lock);
> +		if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)
> +				|| inode->i_mapping->nrpages == 0) {


This is some pretty strange formatting.

		if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
		    inode->i_mapping->nrpages == 0) {

would be more standard.

>  	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
>  		struct address_space *mapping;
>  
> -		if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW))
> -			continue;
>  		mapping = inode->i_mapping;
>  		if (mapping->nrpages == 0)
>  			continue;
> +		spin_lock(&inode->i_lock);
> +		if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) {
> +			spin_unlock(&inode->i_lock);
> +			continue;
> +		}

Can we access the mapping safely when the inode isn't actually fully
setup?  Even if we can I'd rather not introduce this change hidden
inside an unrelated patch.

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