GFS2: Add readahead to sequential directory traversal

This patch adds read-ahead capability to GFS2's
directory hash table management.  It greatly improves
performance for some directory operations.  For example:
In one of my file systems that has 1000 directories, each
of which has 1000 files, time to execute a recursive
ls (time ls -fR /mnt/gfs2 > /dev/null) was reduced
from 2m2.814s on a stock kernel to 0m45.938s.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/gfs2/dir.h b/fs/gfs2/dir.h
index ff5772fbf024..98c960beab35 100644
--- a/fs/gfs2/dir.h
+++ b/fs/gfs2/dir.h
@@ -25,7 +25,7 @@ extern int gfs2_dir_add(struct inode *inode, const struct qstr *filename,
                         const struct gfs2_inode *ip);
 extern int gfs2_dir_del(struct gfs2_inode *dip, const struct dentry *dentry);
 extern int gfs2_dir_read(struct inode *inode, u64 *offset, void *opaque,
-                         filldir_t filldir);
+                         filldir_t filldir, struct file_ra_state *f_ra);
 extern int gfs2_dir_mvino(struct gfs2_inode *dip, const struct qstr *filename,
                           const struct gfs2_inode *nip, unsigned int new_type);