GFS2: Sort buffer lists by inplace block number

This patch simply sort the data and metadata buffer lists by their
inplace block number.  This makes gfs2_log_flush issue the inplace IO
in sequential order, which will hopefully speed up writing the IO
out to disk.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index 6c33d7b6e0c4e26b6b02d74d8d5e090f26c820e9..cb017a692fe6b394f14987dfb1dc276dbde44c62 100644 (file)
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -16,6 +16,7 @@
 #include <linux/gfs2_ondisk.h>
 #include <linux/bio.h>
 #include <linux/fs.h>
+#include <linux/list_sort.h>
 
 #include "gfs2.h"
 #include "incore.h"
@@ -401,6 +402,20 @@ static void gfs2_check_magic(struct buffer_head *bh)
        kunmap_atomic(kaddr);
 }
 
+static int blocknr_cmp(void *priv, struct list_head *a, struct list_head *b)
+{
+       struct gfs2_bufdata *bda, *bdb;
+
+       bda = list_entry(a, struct gfs2_bufdata, bd_list);
+       bdb = list_entry(b, struct gfs2_bufdata, bd_list);
+
+       if (bda->bd_bh->b_blocknr < bdb->bd_bh->b_blocknr)
+               return -1;
+       if (bda->bd_bh->b_blocknr > bdb->bd_bh->b_blocknr)
+               return 1;
+       return 0;
+}
+
 static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
                                unsigned int total, struct list_head *blist,
                                bool is_databuf)
@@ -413,6 +428,7 @@ static void gfs2_before_commit(struct gfs2_sbd *sdp, unsigned int limit,
        __be64 *ptr;
 
        gfs2_log_lock(sdp);
+       list_sort(NULL, blist, blocknr_cmp);
        bd1 = bd2 = list_prepare_entry(bd1, blist, bd_list);
        while(total) {
                num = total;