fsck_vxfs initiation phase

The ``initiation phase'' of fsck interprets the command line and decides which functions to perform. The operations of this phase are as follows:

1. Superblock verification is initiated to determine if the filesystem is a valid vxfs filesystem. If the filesystem is not a valid vxfs filesystem, fsck prints a message and then exits. The error message might look like this:

      (invalid superblock magic 00000000)
   

2. If the command line specifies sanity check (-m option), the sanity check is initiated. Sanity Check exits when complete.

3. The state of the filesystem is checked.

4. Intent log replay is initiated unless one of the following is true:

   • The filesystem state is CLEAN.

   • The -n option was specified.

   • The superblock indicates that the intent log is damaged.

   • The -o nolog option was specified.

5. Full filesystem check is initiated if one of the following is true:

   • The -n option was specified.

   • The filesystem state is not mountable after intent log replay has run and the -y option was specified.

   • The -o full option was specified.