Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  loop: export module parameters
  block: export blk_{get,put}_queue()
  block: remove unused variable in bio_attempt_front_merge()
  block: always allocate genhd->ev if check_events is implemented
  brd: export module parameters
  brd: fix comment on initial device creation
  brd: handle on-demand devices correctly
  brd: limit 'max_part' module param to DISK_MAX_PARTS
  brd: get rid of unused members from struct brd_device
  block: fix oops on !disk->queue and sysfs discard alignment display

block/blk-core.c

@@ -345,6 +345,7 @@ void blk_put_queue(struct request_queue *q)
 {
 	kobject_put(&q->kobj);
 }
+EXPORT_SYMBOL(blk_put_queue);
 
 /*
  * Note: If a driver supplied the queue lock, it should not zap that lock
@@ -566,6 +567,7 @@ int blk_get_queue(struct request_queue *q)
 
 	return 1;
 }
+EXPORT_SYMBOL(blk_get_queue);
 
 static inline void blk_free_request(struct request_queue *q, struct request *rq)
 {
@@ -1130,7 +1132,6 @@ static bool bio_attempt_front_merge(struct request_queue *q,
 				    struct request *req, struct bio *bio)
 {
 	const int ff = bio->bi_rw & REQ_FAILFAST_MASK;
-	sector_t sector;
 
 	if (!ll_front_merge_fn(q, req, bio))
 		return false;
@@ -1140,8 +1141,6 @@ static bool bio_attempt_front_merge(struct request_queue *q,
 	if ((req->cmd_flags & REQ_FAILFAST_MASK) != ff)
 		blk_rq_set_mixed_merge(req);
 
-	sector = bio->bi_sector;
-
 	bio->bi_next = req->bio;
 	req->bio = bio;
 

block/genhd.c

@@ -1728,7 +1728,7 @@ static void disk_add_events(struct gendisk *disk)
 {
 	struct disk_events *ev;
 
-	if (!disk->fops->check_events || !(disk->events | disk->async_events))
+	if (!disk->fops->check_events)
 		return;
 
 	ev = kzalloc(sizeof(*ev), GFP_KERNEL);

drivers/block/brd.c

@@ -35,10 +35,6 @@
  */
 struct brd_device {
 	int		brd_number;
-	int		brd_refcnt;
-	loff_t		brd_offset;
-	loff_t		brd_sizelimit;
-	unsigned	brd_blocksize;
 
 	struct request_queue	*brd_queue;
 	struct gendisk		*brd_disk;
@@ -440,11 +436,11 @@ static int rd_nr;
 int rd_size = CONFIG_BLK_DEV_RAM_SIZE;
 static int max_part;
 static int part_shift;
-module_param(rd_nr, int, 0);
+module_param(rd_nr, int, S_IRUGO);
 MODULE_PARM_DESC(rd_nr, "Maximum number of brd devices");
-module_param(rd_size, int, 0);
+module_param(rd_size, int, S_IRUGO);
 MODULE_PARM_DESC(rd_size, "Size of each RAM disk in kbytes.");
-module_param(max_part, int, 0);
+module_param(max_part, int, S_IRUGO);
 MODULE_PARM_DESC(max_part, "Maximum number of partitions per RAM disk");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_BLOCKDEV_MAJOR(RAMDISK_MAJOR);
@@ -552,7 +548,7 @@ static struct kobject *brd_probe(dev_t dev, int *part, void *data)
 	struct kobject *kobj;
 
 	mutex_lock(&brd_devices_mutex);
-	brd = brd_init_one(dev & MINORMASK);
+	brd = brd_init_one(MINOR(dev) >> part_shift);
 	kobj = brd ? get_disk(brd->brd_disk) : ERR_PTR(-ENOMEM);
 	mutex_unlock(&brd_devices_mutex);
 
@@ -575,25 +571,39 @@ static int __init brd_init(void)
 	 *
 	 * (1) if rd_nr is specified, create that many upfront, and this
 	 *     also becomes a hard limit.
-	 * (2) if rd_nr is not specified, create 1 rd device on module
-	 *     load, user can further extend brd device by create dev node
-	 *     themselves and have kernel automatically instantiate actual
-	 *     device on-demand.
+	 * (2) if rd_nr is not specified, create CONFIG_BLK_DEV_RAM_COUNT
+	 *     (default 16) rd device on module load, user can further
+	 *     extend brd device by create dev node themselves and have
+	 *     kernel automatically instantiate actual device on-demand.
 	 */
 
 	part_shift = 0;
-	if (max_part > 0)
+	if (max_part > 0) {
 		part_shift = fls(max_part);
 
+		/*
+		 * Adjust max_part according to part_shift as it is exported
+		 * to user space so that user can decide correct minor number
+		 * if [s]he want to create more devices.
+		 *
+		 * Note that -1 is required because partition 0 is reserved
+		 * for the whole disk.
+		 */
+		max_part = (1UL << part_shift) - 1;
+	}
+
+	if ((1UL << part_shift) > DISK_MAX_PARTS)
+		return -EINVAL;
+
 	if (rd_nr > 1UL << (MINORBITS - part_shift))
 		return -EINVAL;
 
 	if (rd_nr) {
 		nr = rd_nr;
-		range = rd_nr;
+		range = rd_nr << part_shift;
 	} else {
 		nr = CONFIG_BLK_DEV_RAM_COUNT;
-		range = 1UL << (MINORBITS - part_shift);
+		range = 1UL << MINORBITS;
 	}
 
 	if (register_blkdev(RAMDISK_MAJOR, "ramdisk"))
@@ -632,7 +642,7 @@ static void __exit brd_exit(void)
 	unsigned long range;
 	struct brd_device *brd, *next;
 
-	range = rd_nr ? rd_nr :  1UL << (MINORBITS - part_shift);
+	range = rd_nr ? rd_nr << part_shift : 1UL << MINORBITS;
 
 	list_for_each_entry_safe(brd, next, &brd_devices, brd_list)
 		brd_del_one(brd);

drivers/block/loop.c

@@ -1540,9 +1540,9 @@ static const struct block_device_operations lo_fops = {
  * And now the modules code and kernel interface.
  */
 static int max_loop;
-module_param(max_loop, int, 0);
+module_param(max_loop, int, S_IRUGO);
 MODULE_PARM_DESC(max_loop, "Maximum number of loop devices");
-module_param(max_part, int, 0);
+module_param(max_part, int, S_IRUGO);
 MODULE_PARM_DESC(max_part, "Maximum number of partitions per loop device");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS_BLOCKDEV_MAJOR(LOOP_MAJOR);
@@ -1688,9 +1688,20 @@ static int __init loop_init(void)
 	 */
 
 	part_shift = 0;
-	if (max_part > 0)
+	if (max_part > 0) {
 		part_shift = fls(max_part);
 
+		/*
+		 * Adjust max_part according to part_shift as it is exported
+		 * to user space so that user can decide correct minor number
+		 * if [s]he want to create more devices.
+		 *
+		 * Note that -1 is required because partition 0 is reserved
+		 * for the whole disk.
+		 */
+		max_part = (1UL << part_shift) - 1;
+	}
+
 	if ((1UL << part_shift) > DISK_MAX_PARTS)
 		return -EINVAL;
 

fs/partitions/check.c

@@ -256,10 +256,12 @@ ssize_t part_discard_alignment_show(struct device *dev,
 {
 	struct hd_struct *p = dev_to_part(dev);
 	struct gendisk *disk = dev_to_disk(dev);
+	unsigned int alignment = 0;
 
-	return sprintf(buf, "%u\n",
-			queue_limit_discard_alignment(&disk->queue->limits,
-							p->start_sect));
+	if (disk->queue)
+		alignment = queue_limit_discard_alignment(&disk->queue->limits,
+								p->start_sect);
+	return sprintf(buf, "%u\n", alignment);
 }
 
 ssize_t part_stat_show(struct device *dev,