Btrfs: return code checking

Signed-off-by: Chris Mason <chris.mason@oracle.com>

fs/btrfs/Makefile

 
+CC=gcc
 CFLAGS = -g -Wall
 headers = radix-tree.h ctree.h disk-io.h kerncompat.h print-tree.h
 objects = ctree.o disk-io.o radix-tree.o mkfs.o extent-tree.o print-tree.o
 
 # if you don't have sparse installed, use ls instead
-check=sparse
+CHECKFLAGS=-D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise \
+		-Wcontext -Wcast-truncate -Wuninitialized -Wshadow -Wundef
+check=sparse $(CHECKFLAGS)
 #check=ls
 
 .c.o:

fs/btrfs/extent-tree.c

@@ -125,6 +125,11 @@ int find_free_extent(struct ctree_root *orig_root, u64 num_blocks,
 	ins->flags = 0;
 	start_found = 0;
 	ret = search_slot(root, ins, &path, 0);
+	if (ret < 0) {
+		release_path(root, &path);
+		return ret;
+	}
+
 	while (1) {
 		l = &path.nodes[0]->leaf;
 		slot = path.slots[0];

fs/btrfs/random-test.c

@@ -134,7 +134,7 @@ static int lookup_enoent(struct ctree_root *root, struct radix_tree_root *radix)
 		return ret;
 	ret = search_slot(root, &key, &path, 0);
 	release_path(root, &path);
-	if (ret == 0)
+	if (ret <= 0)
 		goto error;
 	return 0;
 error:
@@ -153,12 +153,17 @@ static int fill_radix(struct ctree_root *root, struct radix_tree_root *radix)
 	int ret;
 	int slot;
 	int i;
+
 	key.offset = 0;
 	key.flags = 0;
 	key.objectid = (unsigned long)-1;
 	while(1) {
 		init_path(&path);
 		ret = search_slot(root, &key, &path, 0);
+		if (ret < 0) {
+			release_path(root, &path);
+			return ret;
+		}
 		slot = path.slots[0];
 		if (ret != 0) {
 			if (slot == 0) {