From: Abhijith Das <adas@redhat.com>
Date: Mon, 18 May 2009 10:51:00 -0500
Subject: [dlm] use more NOFS allocation
Message-id: 4A1183E4.3000000@redhat.com
O-Subject: [RHEL5.4 PATCH 2/2] [DLM] - use more NOFS allocation
Bugzilla: 460218
RH-Acked-by: Steven Whitehouse <swhiteho@redhat.com>
RH-Acked-by: Bob Peterson <rpeterso@redhat.com>

Fixes bz460218

Change some GFP_KERNEL allocations to use either GFP_NOFS or
ls_allocation (when available) which the fs sets to GFP_NOFS.
The point is to prevent allocations from going back into the
cluster fs in places where that might lead to deadlock.

Signed-off-by: David Teigland <teigland@redhat.com>

diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c
index ff97ba9..994b526 100644
--- a/fs/dlm/dir.c
+++ b/fs/dlm/dir.c
@@ -49,7 +49,8 @@ static struct dlm_direntry *get_free_de(struct dlm_ls *ls, int len)
 	spin_unlock(&ls->ls_recover_list_lock);
 
 	if (!found)
-		de = kzalloc(sizeof(struct dlm_direntry) + len, GFP_KERNEL);
+		de = kzalloc(sizeof(struct dlm_direntry) + len,
+			     ls->ls_allocation);
 	return de;
 }
 
@@ -211,7 +212,7 @@ int dlm_recover_directory(struct dlm_ls *ls)
 
 	dlm_dir_clear(ls);
 
-	last_name = kmalloc(DLM_RESNAME_MAXLEN, GFP_KERNEL);
+	last_name = kmalloc(DLM_RESNAME_MAXLEN, ls->ls_allocation);
 	if (!last_name)
 		goto out;
 
@@ -302,7 +303,7 @@ static int get_entry(struct dlm_ls *ls, int nodeid, char *name,
 
 	write_unlock(&ls->ls_dirtbl[bucket].lock);
 
-	de = kzalloc(sizeof(struct dlm_direntry) + namelen, GFP_KERNEL);
+	de = kzalloc(sizeof(struct dlm_direntry) + namelen, ls->ls_allocation);
 	if (!de)
 		return -ENOMEM;
 
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c
index 0310f5d..877662f 100644
--- a/fs/dlm/lowcomms.c
+++ b/fs/dlm/lowcomms.c
@@ -477,7 +477,7 @@ static void process_sctp_notification(struct connection *con,
 				return;
 			}
 
-			new_con = nodeid2con(nodeid, GFP_KERNEL);
+			new_con = nodeid2con(nodeid, GFP_NOFS);
 			if (!new_con)
 				return;
 
@@ -713,7 +713,7 @@ static int tcp_accept_from_sock(struct connection *con)
 	 *  the same time and the connections cross on the wire.
 	 *  In this case we store the incoming one in "othercon"
 	 */
-	newcon = nodeid2con(nodeid, GFP_KERNEL);
+	newcon = nodeid2con(nodeid, GFP_NOFS);
 	if (!newcon) {
 		result = -ENOMEM;
 		goto accept_err;
@@ -723,7 +723,7 @@ static int tcp_accept_from_sock(struct connection *con)
 		struct connection *othercon = newcon->othercon;
 
 		if (!othercon) {
-			othercon = kmem_cache_zalloc(con_cache, GFP_KERNEL);
+			othercon = kmem_cache_zalloc(con_cache, GFP_NOFS);
 			if (!othercon) {
 				log_print("failed to allocate incoming socket");
 				mutex_unlock(&newcon->sock_mutex);
diff --git a/fs/dlm/member.c b/fs/dlm/member.c
index 3dce0f3..9b36cd1 100644
--- a/fs/dlm/member.c
+++ b/fs/dlm/member.c
@@ -48,7 +48,7 @@ static int dlm_add_member(struct dlm_ls *ls, int nodeid)
 	struct dlm_member *memb;
 	int w, error;
 
-	memb = kzalloc(sizeof(struct dlm_member), GFP_KERNEL);
+	memb = kzalloc(sizeof(struct dlm_member), ls->ls_allocation);
 	if (!memb)
 		return -ENOMEM;
 
@@ -143,7 +143,7 @@ static void make_member_array(struct dlm_ls *ls)
 
 	ls->ls_total_weight = total;
 
-	array = kmalloc(sizeof(int) * total, GFP_KERNEL);
+	array = kmalloc(sizeof(int) * total, ls->ls_allocation);
 	if (!array)
 		return;
 
@@ -324,7 +324,7 @@ int dlm_ls_start(struct dlm_ls *ls)
 	int *ids = NULL;
 	int error, count;
 
-	rv = kzalloc(sizeof(struct dlm_recover), GFP_KERNEL);
+	rv = kzalloc(sizeof(struct dlm_recover), ls->ls_allocation);
 	if (!rv)
 		return -ENOMEM;
 
diff --git a/fs/dlm/requestqueue.c b/fs/dlm/requestqueue.c
index 5b1bcf0..0fec453 100644
--- a/fs/dlm/requestqueue.c
+++ b/fs/dlm/requestqueue.c
@@ -35,7 +35,7 @@ void dlm_add_requestqueue(struct dlm_ls *ls, int nodeid, struct dlm_header *hd)
 	struct rq_entry *e;
 	int length = hd->h_length;
 
-	e = kmalloc(sizeof(struct rq_entry) + length, GFP_KERNEL);
+	e = kmalloc(sizeof(struct rq_entry) + length, ls->ls_allocation);
 	if (!e) {
 		log_print("dlm_add_requestqueue: out of memory len %d", length);
 		return;