test-filesys-flag.patch

   1 diff --git a/fs/ext4/super.c b/fs/ext4/super.c
   2 index 055a0cd..8a405ae 100644
   3 --- a/fs/ext4/super.c
   4 +++ b/fs/ext4/super.c
   5 @@ -1926,6 +1926,17 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
   6                 printk(KERN_WARNING
   7                        "EXT4-fs warning: feature flags set on rev 0 fs, "
   8                        "running e2fsck is recommended\n");
   9 +
  10 +       /*
  11 +        * Since ext4 is still considered development code, we require
  12 +        * that the TEST_FILESYS flag in s->flags be set.
  13 +        */
  14 +       if (!(le32_to_cpu(es->s_flags) & EXT2_FLAGS_TEST_FILESYS)) {
  15 +               printk(KERN_WARNING "EXT4-fs: %s: not marked "
  16 +                      "OK to use with test code.\n", sb->s_id);
  17 +               goto failed_mount;
  18 +       }
  19 +
  20         /*
  21          * Check feature flags regardless of the revision level, since we
  22          * previously didn't change the revision level when setting the flags,
  23 diff --git a/include/linux/ext4_fs.h b/include/linux/ext4_fs.h
  24 index 1852313..285fa6c 100644
  25 --- a/include/linux/ext4_fs.h
  26 +++ b/include/linux/ext4_fs.h
  27 @@ -490,6 +490,13 @@ do {                                                                              \
  28  #define        EXT4_ORPHAN_FS                  0x0004  /* Orphans being recovered */
  29
  30  /*
  31 + * Misc. filesystem flags
  32 + */
  33 +#define EXT2_FLAGS_SIGNED_HASH         0x0001  /* Signed dirhash in use */
  34 +#define EXT2_FLAGS_UNSIGNED_HASH       0x0002  /* Unsigned dirhash in use */
  35 +#define EXT2_FLAGS_TEST_FILESYS                0x0004  /* OK for use on development code */
  36 +
  37 +/*
  38   * Mount flags
  39   */
  40  #define EXT4_MOUNT_CHECK               0x00001 /* Do mount-time checks */