dlm: fix up memory allocation flags

Use ls_allocation for memory allocations, which a cluster fs sets to
GFP_NOFS.  Use GFP_NOFS for allocations when no lockspace struct is
available.  Taking dlm locks needs to avoid calling back into the
cluster fs because write-out can require taking dlm locks.

Cc: Christine Caulfield <ccaulfie@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/lowcomms.c

@@ -295,6 +295,7 @@ static int add_sock(struct socket *sock, struct connection *con)
 	con->sock->sk->sk_write_space = lowcomms_write_space;
 	con->sock->sk->sk_state_change = lowcomms_state_change;
 	con->sock->sk->sk_user_data = con;
+	con->sock->sk->sk_allocation = GFP_NOFS;
 	return 0;
 }
 

fs/dlm/memory.c

@@ -39,7 +39,7 @@ char *dlm_allocate_lvb(struct dlm_ls *ls)
 {
 	char *p;
 
-	p = kzalloc(ls->ls_lvblen, GFP_KERNEL);
+	p = kzalloc(ls->ls_lvblen, ls->ls_allocation);
 	return p;
 }
 
@@ -57,7 +57,7 @@ struct dlm_rsb *dlm_allocate_rsb(struct dlm_ls *ls, int namelen)
 
 	DLM_ASSERT(namelen <= DLM_RESNAME_MAXLEN,);
 
-	r = kzalloc(sizeof(*r) + namelen, GFP_KERNEL);
+	r = kzalloc(sizeof(*r) + namelen, ls->ls_allocation);
 	return r;
 }
 
@@ -72,7 +72,7 @@ struct dlm_lkb *dlm_allocate_lkb(struct dlm_ls *ls)
 {
 	struct dlm_lkb *lkb;
 
-	lkb = kmem_cache_zalloc(lkb_cache, GFP_KERNEL);
+	lkb = kmem_cache_zalloc(lkb_cache, ls->ls_allocation);
 	return lkb;
 }
 

fs/dlm/midcomms.c

@@ -112,7 +112,7 @@ int dlm_process_incoming_buffer(int nodeid, const void *base,
 		   ordinary messages). */
 
 		if (msglen > sizeof(__tmp) && p == &__tmp.p) {
-			p = kmalloc(dlm_config.ci_buffer_size, GFP_KERNEL);
+			p = kmalloc(dlm_config.ci_buffer_size, GFP_NOFS);
 			if (p == NULL)
 				return ret;
 		}