enable-mballoc-by-default.patch

   1 ext4: Enable the multiblock allocator by default
   2
   3 From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
   4
   5 Enable the multiblock allocator by default.
   6
   7 Fix ext4_show_options() so if it is not enabled, the nomballoc option
   8 included in /proc/mounts.
   9
  10 Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
  11 Acked-by: Eric Sandeen <sandeen@redhat.com>
  12 Signed-off-by: Mingming Cao <cmm@us.ibm.com>
  13 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
  14
  15 ---
  16
  17  fs/ext4/super.c |    7 +++++++
  18  1 file changed, 7 insertions(+)
  19
  20
  21 Index: linux-2.6.24-rc7/fs/ext4/super.c
  22 ===================================================================
  23 --- linux-2.6.24-rc7.orig/fs/ext4/super.c       2008-01-16 13:52:19.000000000 -0800
  24 +++ linux-2.6.24-rc7/fs/ext4/super.c    2008-01-16 13:52:28.000000000 -0800
  25 @@ -736,6 +736,8 @@ static int ext4_show_options(struct seq_
  26                 seq_puts(seq, ",nobh");
  27         if (!test_opt(sb, EXTENTS))
  28                 seq_puts(seq, ",noextents");
  29 +       if (!test_opt(sb, MBALLOC))
  30 +               seq_puts(seq, ",nomballoc");
  31         if (test_opt(sb, I_VERSION))
  32                 seq_puts(seq, ",i_version");
  33
  34 @@ -1902,6 +1904,11 @@ static int ext4_fill_super (struct super
  35          * User -o noextents to turn it off
  36          */
  37         set_opt(sbi->s_mount_opt, EXTENTS);
  38 +       /*
  39 +        * turn on mballoc feature by default in ext4 filesystem
  40 +        * User -o nomballoc to turn it off
  41 +        */
  42 +       set_opt(sbi->s_mount_opt, MBALLOC);
  43
  44         if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
  45                             NULL, 0))