ext4: Enable delalloc and mballoc by default.

From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>

This ensure we test the latest features more easily.
We need an option to clear delayed alloc feature.
Add nodelalloc option.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---

 fs/ext4/super.c |   14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)


Index: linux-2.6.25-rc1/fs/ext4/super.c
===================================================================
--- linux-2.6.25-rc1.orig/fs/ext4/super.c	2008-02-14 11:39:11.000000000 -0800
+++ linux-2.6.25-rc1/fs/ext4/super.c	2008-02-14 11:39:17.000000000 -0800
@@ -887,7 +887,7 @@ enum {
 	Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
 	Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
 	Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
-	Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc,
+	Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc,
 };
 
 static match_table_t tokens = {
@@ -946,6 +946,7 @@ static match_table_t tokens = {
 	{Opt_nomballoc, "nomballoc"},
 	{Opt_stripe, "stripe=%u"},
 	{Opt_delalloc, "delalloc"},
+	{Opt_nodelalloc, "nodelalloc"},
 	{Opt_err, NULL},
 	{Opt_resize, "resize"},
 };
@@ -1295,6 +1296,9 @@ clear_qf_name:
 			set_opt(sbi->s_mount_opt, I_VERSION);
 			sb->s_flags |= MS_I_VERSION;
 			break;
+		case Opt_nodelalloc:
+			clear_opt(sbi->s_mount_opt, DELALLOC);
+			break;
 		case Opt_mballoc:
 			set_opt(sbi->s_mount_opt, MBALLOC);
 			break;
@@ -1958,6 +1962,14 @@ static int ext4_fill_super (struct super
 	 */
 	set_opt(sbi->s_mount_opt, MBALLOC);
 
+	/*
+	 * enable delayed allocation by default
+	 * Use -o nodelalloc to turn it off
+	 */
+	set_opt(sbi->s_mount_opt, DELALLOC);
+	set_opt(sbi->s_mount_opt, WRITEBACK_DATA);
+
+
 	if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
 			    NULL, 0))
 		goto failed_mount;