read-ahead: use plugging

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/mm/readahead.c b/mm/readahead.c
index cbddc3e1724671bdf7bc2d9b3d95d54af987538f..443dd1b57f99c1bafe4f14b3477e2071e97385a5 100644 (file)
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -112,6 +112,8 @@ static int read_pages(struct address_space *mapping, struct file *filp,
        unsigned page_idx;
        int ret;
 
+       blk_plug_current();
+
        if (mapping->a_ops->readpages) {
                ret = mapping->a_ops->readpages(filp, mapping, pages, nr_pages);
                /* Clean up the remaining pages */
@@ -129,7 +131,10 @@ static int read_pages(struct address_space *mapping, struct file *filp,
                page_cache_release(page);
        }
        ret = 0;
+
 out:
+       blk_unplug_current();
+
        return ret;
 }