linux-kernel - Re: [PATCH 6/7] radixtree: introduce radix_tree_scan

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Message-ID: <20070723081209.GA12393@mail.ustc.edu.cn>
Date:	Mon, 23 Jul 2007 16:12:09 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Nick Piggin <nickpiggin@...oo.com.au>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] radixtree: introduce radix_tree_scan_hole()

On Mon, Jul 23, 2007 at 04:04:05PM +0800, Fengguang Wu wrote:
> On Mon, Jul 23, 2007 at 05:58:02PM +1000, Nick Piggin wrote:
> > Fengguang Wu wrote:
> > >Introduce radix_tree_scan_hole(root, index, max_scan) to scan radix tree
> > >for the first hole. It will be used in interleaved readahead.
> > >
> > >The implementation is dumb and obviously correct.
> > >It can help debug(and document) the possible smart one in future.
> > 
> > Reasonable function to want. Is radix_tree_scan_hole the best name?
> > What about radix_tree_next_hole or _find_next_hole? (Andrew, any
> > suggestions?)
> 
> Thank you!
> 
> All comments seems reasonable, so I simply attach the updated patch.
> 
> Fengguang
> ---
> Subject: radixtree: introduce radix_tree_next_hole()
> Cc: Nick Piggin <nickpiggin@...oo.com.au>
> 
> Introduce radix_tree_next_hole(root, index, max_scan) to scan radix tree
> for the first hole. It will be used in interleaved readahead.
> 
> Cc: Nick Piggin <nickpiggin@...oo.com.au>
> Signed-off-by: Fengguang Wu <wfg@...l.ustc.edu.cn>

And another rename fix for the interleaved readahead patch.

Signed-off-by: Fengguang Wu <wfg@...l.ustc.edu.cn>
---
 mm/readahead.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.22-rc6-mm1.orig/mm/readahead.c
+++ linux-2.6.22-rc6-mm1/mm/readahead.c
@@ -372,7 +372,7 @@ ondemand_readahead(struct address_space 
 		pgoff_t start;
 
 		read_lock_irq(&mapping->tree_lock);
-		start = radix_tree_scan_hole(&mapping->page_tree, offset, max+1);
+		start = radix_tree_next_hole(&mapping->page_tree, offset, max+1);
 		read_unlock_irq(&mapping->tree_lock);
 
 		if (!start || start - offset > max)

-
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