1 files changed, 33 insertions, 0 deletions

diff --git a/fs/hpfs/buffer.c b/fs/hpfs/buffer.c
index f49d1498aa2e..4d0a1afa058c 100644
--- a/fs/hpfs/buffer.c
+++ b/fs/hpfs/buffer.c
@@ -7,8 +7,37 @@
  */
 #include <linux/sched.h>
 #include <linux/slab.h>
+#include <linux/blkdev.h>
 #include "hpfs_fn.h"
 
+void hpfs_prefetch_sectors(struct super_block *s, unsigned secno, int n)
+{
+        struct buffer_head *bh;
+        struct blk_plug plug;
+
+        if (n <= 0 || unlikely(secno >= hpfs_sb(s)->sb_fs_size))
+                return;
+
+        bh = sb_find_get_block(s, secno);
+        if (bh) {
+                if (buffer_uptodate(bh)) {
+                        brelse(bh);
+                        return;
+                }
+                brelse(bh);
+        };
+
+        blk_start_plug(&plug);
+        while (n > 0) {
+                if (unlikely(secno >= hpfs_sb(s)->sb_fs_size))
+                        break;
+                sb_breadahead(s, secno);
+                secno++;
+                n--;
+        }
+        blk_finish_plug(&plug);
+}
+
 /* Map a sector into a buffer and return pointers to it and to the buffer. */
 
 void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head **bhp,
@@ -18,6 +47,8 @@ void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head
 
         hpfs_lock_assert(s);
 
+        hpfs_prefetch_sectors(s, secno, ahead);
+
         cond_resched();
 
         *bhp = bh = sb_bread(s, secno);
@@ -67,6 +98,8 @@ void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffe
                 return NULL;
         }
 
+        hpfs_prefetch_sectors(s, secno, 4 + ahead);
+
         qbh->data = data = kmalloc(2048, GFP_NOFS);
         if (!data) {
                 printk("HPFS: hpfs_map_4sectors: out of memory\n");