[XFS] Unwrap LOG_LOCK.

Un-obfuscate LOG_LOCK, remove LOG_LOCK->mutex_lock->spin_lock macros, call
spin_lock directly, remove extraneous cookie holdover from old xfs code,
and change lock type to spinlock_t.

SGI-PV: 970382
SGI-Modid: xfs-linux-melb:xfs-kern:29740a
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Donald Douwsma <donaldd@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

fs/xfs/xfs_log_priv.h

@@ -107,8 +107,6 @@ struct xfs_mount;
 
 #define GRANT_LOCK(log)		mutex_spinlock(&(log)->l_grant_lock)
 #define GRANT_UNLOCK(log, s)	mutex_spinunlock(&(log)->l_grant_lock, s)
-#define LOG_LOCK(log)		mutex_spinlock(&(log)->l_icloglock)
-#define LOG_UNLOCK(log, s)	mutex_spinunlock(&(log)->l_icloglock, s)
 
 #define xlog_panic(args...)	cmn_err(CE_PANIC, ## args)
 #define xlog_exit(args...)	cmn_err(CE_PANIC, ## args)
@@ -415,7 +413,7 @@ typedef struct log {
 	xlog_ticket_t		*l_unmount_free;/* kmem_free these addresses */
 	xlog_ticket_t		*l_tail;        /* free list of tickets */
 	xlog_in_core_t		*l_iclog;       /* head log queue	*/
-	lock_t			l_icloglock;    /* grab to change iclog state */
+	spinlock_t		l_icloglock;    /* grab to change iclog state */
 	xfs_lsn_t		l_tail_lsn;     /* lsn of 1st LR with unflushed
 						 * buffers */
 	xfs_lsn_t		l_last_sync_lsn;/* lsn of last LR on disk */