Index: linux-3.10.0-327.10.1.el7.x86_64/fs/ext4/mballoc.c
===================================================================
--- linux-3.10.0-327.10.1.el7.x86_64.orig/fs/ext4/mballoc.c
+++ linux-3.10.0-327.10.1.el7.x86_64/fs/ext4/mballoc.c
@@ -2435,6 +2435,77 @@ static struct kmem_cache *get_groupinfo_
 	return cachep;
 }

+#define EXT4_MB_MAX_INPUT_STRING_SIZE 32
+
+static ssize_t ext4_mb_last_group_write(struct file *file,
+					const char __user *buf,
+					size_t cnt, loff_t *pos)
+{
+	char dummy[EXT4_MB_MAX_INPUT_STRING_SIZE + 1];
+	struct super_block *sb = PDE_DATA(file_inode(file));
+	struct ext4_sb_info *sbi = EXT4_SB(sb);
+	unsigned long val;
+	char *end;
+
+	if (cnt > EXT4_MB_MAX_INPUT_STRING_SIZE)
+		return -EINVAL;
+	if (copy_from_user(dummy, buf, cnt))
+		return -EFAULT;
+	dummy[cnt] = '\0';
+	val = simple_strtoul(dummy, &end, 0);
+	if (dummy == end)
+		return -EINVAL;
+	if (val >= ext4_get_groups_count(sb))
+		return -ERANGE;
+	spin_lock(&sbi->s_md_lock);
+	sbi->s_mb_last_group = val;
+	sbi->s_mb_last_start = 0;
+	spin_unlock(&sbi->s_md_lock);
+	return cnt;
+}
+
+static int ext4_mb_seq_last_group_seq_show(struct seq_file *m, void *v)
+{
+	struct ext4_sb_info *sbi = EXT4_SB(m->private);
+
+	seq_printf(m , "%ld\n", sbi->s_mb_last_group);
+	return 0;
+}
+
+static int ext4_mb_seq_last_group_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ext4_mb_seq_last_group_seq_show, PDE_DATA(inode));
+}
+
+static const struct file_operations ext4_mb_seq_last_group_fops = {
+	.owner         = THIS_MODULE,
+	.open          = ext4_mb_seq_last_group_open,
+	.read          = seq_read,
+	.llseek        = seq_lseek,
+	.release       = seq_release,
+	.write         = ext4_mb_last_group_write,
+};
+
+static int ext4_mb_seq_last_start_seq_show(struct seq_file *m, void *v)
+{
+	struct ext4_sb_info *sbi = EXT4_SB(m->private);
+
+	seq_printf(m , "%ld\n", sbi->s_mb_last_start);
+	return 0;
+}
+
+static int ext4_mb_seq_last_start_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ext4_mb_seq_last_start_seq_show, PDE_DATA(inode));
+}
+static const struct file_operations ext4_mb_seq_last_start_fops = {
+	.owner         = THIS_MODULE,
+	.open          = ext4_mb_seq_last_start_open,
+	.read          = seq_read,
+	.llseek        = seq_lseek,
+	.release       = seq_release,
+};
+
 /*
  * Allocate the top-level s_group_info array for the specified number
  * of groups
@@ -2790,6 +2861,11 @@ int ext4_mb_init(struct super_block *sb)
 		proc_create_data(EXT4_MB_PREALLOC_TABLE, S_IFREG | S_IRUGO |
 				 S_IWUSR, sbi->s_proc,
 				 &ext4_mb_prealloc_seq_fops, sb);
+		proc_create_data("mb_last_group", S_IFREG | S_IRUGO |
+				 S_IWUSR, sbi->s_proc,
+				 &ext4_mb_seq_last_group_fops, sb);
+		proc_create_data("mb_last_start", S_IFREG | S_IRUGO,
+				 sbi->s_proc, &ext4_mb_seq_last_start_fops, sb);
 	}

 	return 0;
@@ -2835,6 +2911,8 @@ int ext4_mb_release(struct super_block *

 	if (sbi->s_proc) {
 		remove_proc_entry("mb_groups", sbi->s_proc);
+		remove_proc_entry("mb_last_group", sbi->s_proc);
+		remove_proc_entry("mb_last_start", sbi->s_proc);
 		remove_proc_entry(EXT4_MB_PREALLOC_TABLE, sbi->s_proc);
 	}