From: Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>
If page lookup from radix_tree_lookup is successful and its index page_idx ==
nr_to_read - lookahead_size, then SetPageReadahead never gets called, so this
fixes that.
Signed-off-by: Raghavendra D Prabhu <rprabhu@xxxxxxxxxxx>
---
mm/readahead.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/mm/readahead.c b/mm/readahead.c
index 461fcc0..fec726c 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -189,8 +189,10 @@ __do_page_cache_readahead(struct address_space *mapping, struct file *filp,
break;
page->index = page_offset;
list_add(&page->lru, &page_pool);
- if (page_idx == nr_to_read - lookahead_size)
+ if (page_idx >= nr_to_read - lookahead_size) {
SetPageReadahead(page);
+ lookahead_size = 0;
+ }
ret++;
}
--
1.7.12.1
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