ocfs2: embed actual values into ocfs2_sysfile_lock_key names

ocfs2: embed actual values into ocfs2_sysfile_lock_key names

Since lockdep_set_class() uses stringified key name via macro, calling
lockdep_set_class() with an array causes lockdep warning messages to
report variable name than actual index number.

Change ocfs2_init_locked_inode() to pass actual index number for better
readability of lockdep reports.  This patch does not change behavior.

Before:

  Chain exists of:
    &ocfs2_sysfile_lock_key[args->fi_sysfile_type] --> jbd2_handle --> &oi->ip_xattr_sem

   Possible unsafe locking scenario:

         CPU0                    CPU1
         ----                    ----
    lock(&oi->ip_xattr_sem);
                                 lock(jbd2_handle);
                                 lock(&oi->ip_xattr_sem);
    lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]);

   *** DEADLOCK ***

After:

  Chain exists of:
    &ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE] --> jbd2_handle --> &oi->ip_xattr_sem

   Possible unsafe locking scenario:

         CPU0                    CPU1
         ----                    ----
    lock(&oi->ip_xattr_sem);
                                 lock(jbd2_handle);
                                 lock(&oi->ip_xattr_sem);
    lock(&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]);

   *** DEADLOCK ***

Link: https://lkml.kernel.org/r/29348724-639c-443d-bbce-65c3a0a13a38@I-love.SAKURA.ne.jp
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>