[DLM] variable allocation

Add a new flag, DLM_LSFL_FS, to be used when a file system creates a lockspace.
This flag causes the dlm to use GFP_NOFS for allocations instead of GFP_KERNEL.
(This updated version of the patch uses gfp_t for ls_allocation.)
Signed-Off-By: Patrick Caulfield <pcaulfie@redhat.com>
Signed-Off-By: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

fs/dlm/dlm_internal.h

@@ -463,6 +463,7 @@ struct dlm_ls {
 	int			ls_low_nodeid;
 	int			ls_total_weight;
 	int			*ls_node_array;
+	gfp_t			ls_allocation;
 
 	struct dlm_rsb		ls_stub_rsb;	/* for returning errors */
 	struct dlm_lkb		ls_stub_lkb;	/* for returning errors */

fs/dlm/lock.c

@@ -2594,7 +2594,7 @@ static int _create_message(struct dlm_ls *ls, int mb_len,
 	   pass into lowcomms_commit and a message buffer (mb) that we
 	   write our data into */
 
-	mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_KERNEL, &mb);
+	mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, ls->ls_allocation, &mb);
 	if (!mh)
 		return -ENOBUFS;
 

fs/dlm/lockspace.c

@@ -444,6 +444,11 @@ static int new_lockspace(char *name, int namelen, void **lockspace,
 		set_bit(LSFL_TIMEWARN, &ls->ls_flags);
 	ls->ls_exflags = (flags & ~DLM_LSFL_TIMEWARN);
 
+	if (flags & DLM_LSFL_FS)
+		ls->ls_allocation = GFP_NOFS;
+	else
+		ls->ls_allocation = GFP_KERNEL;
+
 	size = dlm_config.ci_rsbtbl_size;
 	ls->ls_rsbtbl_size = size;
 

fs/dlm/rcom.c

@@ -38,7 +38,7 @@ static int create_rcom(struct dlm_ls *ls, int to_nodeid, int type, int len,
 	char *mb;
 	int mb_len = sizeof(struct dlm_rcom) + len;
 
-	mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, GFP_KERNEL, &mb);
+	mh = dlm_lowcomms_get_buffer(to_nodeid, mb_len, ls->ls_allocation, &mb);
 	if (!mh) {
 		log_print("create_rcom to %d type %d len %d ENOBUFS",
 			  to_nodeid, type, len);
@@ -386,7 +386,8 @@ static void receive_rcom_lock_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 	dlm_recover_process_copy(ls, rc_in);
 }
 
-static int send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
+static int send_ls_not_ready(struct dlm_ls *ls, int nodeid,
+			     struct dlm_rcom *rc_in)
 {
 	struct dlm_rcom *rc;
 	struct rcom_config *rf;
@@ -394,7 +395,7 @@ static int send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in)
 	char *mb;
 	int mb_len = sizeof(struct dlm_rcom) + sizeof(struct rcom_config);
 
-	mh = dlm_lowcomms_get_buffer(nodeid, mb_len, GFP_KERNEL, &mb);
+	mh = dlm_lowcomms_get_buffer(nodeid, mb_len, ls->ls_allocation, &mb);
 	if (!mh)
 		return -ENOBUFS;
 	memset(mb, 0, mb_len);
@@ -464,7 +465,7 @@ void dlm_receive_rcom(struct dlm_header *hd, int nodeid)
 		log_print("lockspace %x from %d type %x not found",
 			  hd->h_lockspace, nodeid, rc->rc_type);
 		if (rc->rc_type == DLM_RCOM_STATUS)
-			send_ls_not_ready(nodeid, rc);
+			send_ls_not_ready(ls, nodeid, rc);
 		return;
 	}
 

fs/gfs2/locking/dlm/mount.c

@@ -147,7 +147,7 @@ static int gdlm_mount(char *table_name, char *host_data,
 
 	error = dlm_new_lockspace(ls->fsname, strlen(ls->fsname),
 				  &ls->dlm_lockspace,
-				  nodir ? DLM_LSFL_NODIR : 0,
+				  DLM_LSFL_FS | (nodir ? DLM_LSFL_NODIR : 0),
 				  GDLM_LVB_SIZE);
 	if (error) {
 		log_error("dlm_new_lockspace error %d", error);

include/linux/dlm.h

@@ -206,6 +206,7 @@ struct dlm_lksb {
 
 #define DLM_LSFL_NODIR		0x00000001
 #define DLM_LSFL_TIMEWARN	0x00000002
+#define DLM_LSFL_FS     	0x00000004
 
 #ifdef __KERNEL__