linux-kernel - Re: [PATCH 2/2] f2fs: introduce readahead mode of node pages

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Date:	Wed, 27 Feb 2013 10:04:40 +0900
From:	Jaegeuk Kim <jaegeuk.kim@...sung.com>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 2/2] f2fs: introduce readahead mode of node pages

2013-02-26 (화), 20:52 +0900, Namjae Jeon:
> > @@ -434,7 +434,7 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t
> > index, int ro)
> >  			alloc_nid_done(sbi, nids[i]);
> >  			mutex_unlock_op(sbi, NODE_NEW);
> >  			done = true;
> > -		} else if (ro && i == level && level > 1) {
> > +		} else if (mode == LOOKUP_NODE_RA && i == level && level > 1) {
> >  			npage[i] = get_node_page_ra(parent, offset[i - 1]);
> >  			if (IS_ERR(npage[i])) {
> >  				err = PTR_ERR(npage[i]);
> 
> Hi Jaegeuk.
> There is no LOOKUP_NODE usage in this patch.
> I think that we can use LOOKUP_NODE flag instead of done(bool)  like this.
>  if (mode == LOOKUP_NODE)

Hi.
In order to do that, we should check additional conditions like i and
level together with mode == LOOKUP_NODE.
So, I'm not sure how much it makes clearer by using LOOKUP_NODE
explicitly.
It seems fine to me, since we can just use LOOKUP_NODE to distinguish it
from the other modes.
Any thought?

-- 
Jaegeuk Kim
Samsung

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