linux-kernel - [PATCH][BUG 10227] readahead ret value fix

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Message-ID: <20080314104906.GA2898@darkstar.te-china.tietoenator.com>
Date:	Fri, 14 Mar 2008 18:49:06 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	wfg@...l.ustc.edu.cn, akpm@...ux-foundation.org, jack@...e.cz,
	chris@...uxinfotag.de
Subject: [PATCH][BUG 10227] readahead ret value fix

If the page_offset > end_index, the return value should be updated to 0,
avoiding the redundant read_pages

Signed-off-by: Dave Young <hidave.darkstar@...il.com>

---
mm/readahead.c |    4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff -upr linux/mm/readahead.c linux.new/mm/readahead.c
--- linux/mm/readahead.c	2008-03-14 18:38:12.000000000 +0800
+++ linux.new/mm/readahead.c	2008-03-14 18:38:58.000000000 +0800
@@ -144,8 +144,10 @@ __do_page_cache_readahead(struct address
 	for (page_idx = 0; page_idx < nr_to_read; page_idx++) {
 		pgoff_t page_offset = offset + page_idx;
 
-		if (page_offset > end_index)
+		if (page_offset > end_index) {
+			ret = 0;
 			break;
+		}
 
 		rcu_read_lock();
 		page = radix_tree_lookup(&mapping->page_tree, page_offset);
--
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