bdev: move ->bd_make_it_fail to ->__bd_flags

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

block/blk-core.c

@@ -494,7 +494,8 @@ __setup("fail_make_request=", setup_fail_make_request);
 
 bool should_fail_request(struct block_device *part, unsigned int bytes)
 {
-	return part->bd_make_it_fail && should_fail(&fail_make_request, bytes);
+	return bdev_test_flag(part, BD_MAKE_IT_FAIL) &&
+	       should_fail(&fail_make_request, bytes);
 }
 
 static int __init fail_make_request_debugfs(void)

block/genhd.c

@@ -1066,7 +1066,8 @@ static DEVICE_ATTR(diskseq, 0444, diskseq_show, NULL);
 ssize_t part_fail_show(struct device *dev,
 		       struct device_attribute *attr, char *buf)
 {
-	return sprintf(buf, "%d\n", dev_to_bdev(dev)->bd_make_it_fail);
+	return sprintf(buf, "%d\n",
+		       bdev_test_flag(dev_to_bdev(dev), BD_MAKE_IT_FAIL));
 }
 
 ssize_t part_fail_store(struct device *dev,
@@ -1075,9 +1076,12 @@ ssize_t part_fail_store(struct device *dev,
 {
 	int i;
 
-	if (count > 0 && sscanf(buf, "%d", &i) > 0)
-		dev_to_bdev(dev)->bd_make_it_fail = i;
-
+	if (count > 0 && sscanf(buf, "%d", &i) > 0) {
+		if (i)
+			bdev_set_flag(dev_to_bdev(dev), BD_MAKE_IT_FAIL);
+		else
+			bdev_clear_flag(dev_to_bdev(dev), BD_MAKE_IT_FAIL);
+	}
 	return count;
 }
 

include/linux/blk_types.h

@@ -51,6 +51,9 @@ struct block_device {
 #define BD_WRITE_HOLDER		(1u<<9)
 #define BD_HAS_SUBMIT_BIO	(1u<<10)
 #define BD_RO_WARNED		(1u<<11)
+#ifdef CONFIG_FAIL_MAKE_REQUEST
+#define BD_MAKE_IT_FAIL		(1u<<12)
+#endif
 	dev_t			bd_dev;
 	struct inode		*bd_inode;	/* will die */
 
@@ -67,9 +70,6 @@ struct block_device {
 	struct mutex		bd_fsfreeze_mutex; /* serialize freeze/thaw */
 
 	struct partition_meta_info *bd_meta_info;
-#ifdef CONFIG_FAIL_MAKE_REQUEST
-	bool			bd_make_it_fail;
-#endif
 	int			bd_writers;
 	/*
 	 * keep this out-of-line as it's both big and not needed in the fast