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

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Message-ID: <20101016075421.GB19147@amd>
Date:	Sat, 16 Oct 2010 18:54:21 +1100
From:	Nick Piggin <npiggin@...nel.dk>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Dave Chinner <david@...morbit.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/17] fs: icache lock i_state

On Fri, Oct 01, 2010 at 01:54:33AM -0400, Christoph Hellwig wrote:
> > +		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.

Good point, fixed.

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