[PATCH 42/49] ext4: Enable the multiblock allocator by default

[Theodore Ts'o]

From: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxxxxx>
Acked-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Signed-off-by: Mingming Cao <cmm@xxxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
---
 fs/ext4/super.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 136d095..91a11ec 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");
 
@@ -1902,6 +1904,11 @@ 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))
-- 
1.5.4.rc3.31.g1271-dirty

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