xfs: allow log ticket allocation to take allocation flags

Delayed logging currently requires ticket allocation to succeed, so
we need to be able to sleep on allocation. It also should not allow
memory allocation to recurse into the filesystem. hence we need to
pass allocation flags directing the type of allocation the caller
requires.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

fs/xfs/xfs_log.c

@@ -88,11 +88,9 @@ STATIC void xlog_ungrant_log_space(xlog_t	 *log,
 
 
 /* local ticket functions */
-STATIC xlog_ticket_t	*xlog_ticket_alloc(xlog_t *log,
-					 int	unit_bytes,
-					 int	count,
-					 char	clientid,
-					 uint	flags);
+STATIC xlog_ticket_t *xlog_ticket_alloc(xlog_t *log, int unit_bytes, int count,
+					char clientid, uint flags,
+					int alloc_flags);
 
 #if defined(DEBUG)
 STATIC void	xlog_verify_dest_ptr(xlog_t *log, char *ptr);
@@ -376,7 +374,8 @@ xfs_log_reserve(
 	} else {
 		/* may sleep if need to allocate more tickets */
 		internal_ticket = xlog_ticket_alloc(log, unit_bytes, cnt,
-						  client, flags);
+						  client, flags,
+						  KM_SLEEP|KM_MAYFAIL);
 		if (!internal_ticket)
 			return XFS_ERROR(ENOMEM);
 		internal_ticket->t_trans_type = t_type;
@@ -3331,13 +3330,14 @@ xlog_ticket_alloc(
 	int		unit_bytes,
 	int		cnt,
 	char		client,
-	uint		xflags)
+	uint		xflags,
+	int		alloc_flags)
 {
 	struct xlog_ticket *tic;
 	uint		num_headers;
 	int		iclog_space;
 
-	tic = kmem_zone_zalloc(xfs_log_ticket_zone, KM_SLEEP|KM_MAYFAIL);
+	tic = kmem_zone_zalloc(xfs_log_ticket_zone, alloc_flags);
 	if (!tic)
 		return NULL;