ext4_no_version.patch

   1 Add a "noversion" mount option to disable inode version updates.
   2
   3 Signed-off-by: Andreas Dilger <adilger@clusterfs.com>
   4 Signed-off-by: Kalpak Shah <kalpak@clusterfs.com>
   5
   6 Index: linux-2.6.21/fs/ext4/super.c
   7 ===================================================================
   8 --- linux-2.6.21.orig/fs/ext4/super.c
   9 +++ linux-2.6.21/fs/ext4/super.c
  10 @@ -725,7 +725,7 @@ enum {
  11         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
  12         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
  13         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
  14 -       Opt_grpquota, Opt_extents, Opt_noextents,
  15 +       Opt_grpquota, Opt_extents, Opt_noextents, Opt_noversion,
  16  };
  17
  18  static match_table_t tokens = {
  19 @@ -777,6 +777,7 @@ static match_table_t tokens = {
  20         {Opt_barrier, "barrier=%u"},
  21         {Opt_extents, "extents"},
  22         {Opt_noextents, "noextents"},
  23 +       {Opt_noversion, "noversion"},
  24         {Opt_err, NULL},
  25         {Opt_resize, "resize"},
  26  };
  27 @@ -1115,6 +1116,9 @@ clear_qf_name:
  28                 case Opt_noextents:
  29                         clear_opt (sbi->s_mount_opt, EXTENTS);
  30                         break;
  31 +               case Opt_noversion:
  32 +                       set_opt(sbi->s_mount_opt, NOVERSION);
  33 +                       break;
  34                 default:
  35                         printk (KERN_ERR
  36                                 "EXT4-fs: Unrecognized mount option \"%s\" "
  37 Index: linux-2.6.21/include/linux/ext4_fs.h
  38 ===================================================================
  39 --- linux-2.6.21.orig/include/linux/ext4_fs.h
  40 +++ linux-2.6.21/include/linux/ext4_fs.h
  41 @@ -473,6 +473,7 @@ do {                                                                               \
  42  #define EXT4_MOUNT_USRQUOTA            0x100000 /* "old" user quota */
  43  #define EXT4_MOUNT_GRPQUOTA            0x200000 /* "old" group quota */
  44  #define EXT4_MOUNT_EXTENTS             0x400000 /* Extents support */
  45 +#define EXT4_MOUNT_NOVERSION           0x800000 /* No inode version updates */
  46
  47  /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
  48  #ifndef _LINUX_EXT2_FS_H
  49 Index: linux-2.6.21/fs/ext4/inode.c
  50 ===================================================================
  51 --- linux-2.6.21.orig/fs/ext4/inode.c
  52 +++ linux-2.6.21/fs/ext4/inode.c
  53 @@ -3082,7 +3082,9 @@ int ext4_mark_iloc_dirty(handle_t *handl
  54  {
  55         int err = 0;
  56
  57 -       inode->i_version++;
  58 +       if (!test_opt(inode->i_sb, NOVERSION))
  59 +               inode->i_version++;
  60 +
  61         /* the do_update_inode consumes one bh->b_count */
  62         get_bh(iloc->bh);
  63