ext4: Enable the multiblock allocator by default

Enable the multiblock allocator by default.

Fix ext4_show_options() so if it is not enabled, the nomballoc option
included in /proc/mounts.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 3a51ffc47790..b60c34038bb8 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -736,6 +736,8 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
                 seq_puts(seq, ",nobh");
         if (!test_opt(sb, EXTENTS))
                 seq_puts(seq, ",noextents");
+        if (!test_opt(sb, MBALLOC))
+                seq_puts(seq, ",nomballoc");
         if (test_opt(sb, I_VERSION))
                 seq_puts(seq, ",i_version");
 
@@ -1903,6 +1905,11 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
          * User -o noextents to turn it off
          */
         set_opt(sbi->s_mount_opt, EXTENTS);
+        /*
+         * turn on mballoc feature by default in ext4 filesystem
+         * User -o nomballoc to turn it off
+         */
+        set_opt(sbi->s_mount_opt, MBALLOC);
 
         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
                             NULL, 0))