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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@gmail.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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