1 files changed, 10 insertions, 0 deletions

diff --git a/mm/readahead.c b/mm/readahead.c
index 16378b90843e..d7c6e143a129 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -421,6 +421,16 @@ ondemand_readahead(struct address_space *mapping,
         ra->async_size = ra->size > req_size ? ra->size - req_size : ra->size;
 
 readit:
+        /*
+         * Will this read hit the readahead marker made by itself?
+         * If so, trigger the readahead marker hit now, and merge
+         * the resulted next readahead window into the current one.
+         */
+        if (offset == ra->start && ra->size == ra->async_size) {
+                ra->async_size = get_next_ra_size(ra, max);
+                ra->size += ra->async_size;
+        }
+
         return ra_submit(ra, mapping, filp);
 }