ocfs2: implement directory read-ahead

Uptodate.c now knows about read-ahead buffers. Use some more aggressive
logic in ocfs2_readdir().

The two functions which currently use directory read-ahead are
ocfs2_find_entry() and ocfs2_readdir().

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 24126476a8cc..0d3e939b1f56 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -56,6 +56,7 @@
 #include "journal.h"
 #include "namei.h"
 #include "suballoc.h"
+#include "super.h"
 #include "symlink.h"
 #include "sysfile.h"
 #include "uptodate.h"
@@ -1962,13 +1963,8 @@ restart:
                                 }
                                 num++;
 
-                                /* XXX: questionable readahead stuff here */
                                 bh = ocfs2_bread(dir, b++, &err, 1);
                                 bh_use[ra_max] = bh;
-#if 0           // ???
-                                if (bh)
-                                        ll_rw_block(READ, 1, &bh);
-#endif
                         }
                 }
                 if ((bh = bh_use[ra_ptr++]) == NULL)
@@ -1976,6 +1972,10 @@ restart:
                 wait_on_buffer(bh);
                 if (!buffer_uptodate(bh)) {
                         /* read error, skip block & hope for the best */
+                        ocfs2_error(dir->i_sb, "reading directory %llu, "
+                                    "offset %lu\n",
+                                    (unsigned long long)OCFS2_I(dir)->ip_blkno,
+                                    block);
                         brelse(bh);
                         goto next;
                 }