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

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Message-ID: <CAKYAXd_bMFDuuNzdvsDLC7EviAzp_zu7rK2pgoakjur+Xa-NQg@mail.gmail.com>
Date:	Wed, 27 Feb 2013 10:41:19 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	jaegeuk.kim@...sung.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

2013/2/27, Jaegeuk Kim <jaegeuk.kim@...sung.com>:
> 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?
I agree. And It does really need additional condition.
So Rather, It can make more complicated If using LOOKUP_NODE.
Looks reasonable to me on current change.

Reviewed-by: Namjae Jeon <namjae.jeon@...sung.com>

Thanks!
>
> --
> Jaegeuk Kim
> Samsung
>
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