1 files changed, 9 insertions, 18 deletions

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 809aaa32d53c..f364619092cc 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -32,6 +32,7 @@ extern struct class block_class;
 #include <linux/string.h>
 #include <linux/fs.h>
 #include <linux/workqueue.h>
+#include <linux/xarray.h>
 
 #define PARTITION_META_INFO_VOLNAMELTH	64
 /*
@@ -116,13 +117,6 @@ enum {
 	DISK_EVENT_FLAG_UEVENT			= 1 << 1,
 };
 
-struct disk_part_tbl {
-	struct rcu_head rcu_head;
-	int len;
-	struct block_device __rcu *last_lookup;
-	struct block_device __rcu *part[];
-};
-
 struct disk_events;
 struct badblocks;
 
@@ -148,12 +142,7 @@ struct gendisk {
 	unsigned short events;		/* supported events */
 	unsigned short event_flags;	/* flags related to event processing */
 
-	/* Array of pointers to partitions indexed by partno.
-	 * Protected with matching bdev lock but stat and other
-	 * non-critical accesses use RCU.  Always access through
-	 * helpers.
-	 */
-	struct disk_part_tbl __rcu *part_tbl;
+	struct xarray part_tbl;
 	struct block_device *part0;
 
 	const struct block_device_operations *fops;
@@ -163,6 +152,7 @@ struct gendisk {
 	int flags;
 	unsigned long state;
 #define GD_NEED_PART_SCAN		0
+#define GD_READ_ONLY			1
 	struct kobject *slave_dir;
 
 	struct timer_rand_state *random;
@@ -212,10 +202,11 @@ static inline dev_t disk_devt(struct gendisk *disk)
 	return MKDEV(disk->major, disk->first_minor);
 }
 
+void disk_uevent(struct gendisk *disk, enum kobject_action action);
+
 /*
  * Smarter partition iterator without context limits.
  */
-#define DISK_PITER_REVERSE	(1 << 0) /* iterate in the reverse direction */
 #define DISK_PITER_INCL_EMPTY	(1 << 1) /* include 0-sized parts */
 #define DISK_PITER_INCL_PART0	(1 << 2) /* include partition 0 */
 #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
@@ -223,7 +214,7 @@ static inline dev_t disk_devt(struct gendisk *disk)
 struct disk_part_iter {
 	struct gendisk		*disk;
 	struct block_device	*part;
-	int			idx;
+	unsigned long		idx;
 	unsigned int		flags;
 };
 
@@ -231,7 +222,6 @@ extern void disk_part_iter_init(struct disk_part_iter *piter,
 				 struct gendisk *disk, unsigned int flags);
 struct block_device *disk_part_iter_next(struct disk_part_iter *piter);
 extern void disk_part_iter_exit(struct disk_part_iter *piter);
-extern bool disk_has_partitions(struct gendisk *disk);
 
 /* block/genhd.c */
 extern void device_add_disk(struct device *parent, struct gendisk *disk,
@@ -249,11 +239,12 @@ static inline void add_disk_no_queue_reg(struct gendisk *disk)
 extern void del_gendisk(struct gendisk *gp);
 extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
 
-extern void set_disk_ro(struct gendisk *disk, int flag);
+void set_disk_ro(struct gendisk *disk, bool read_only);
 
 static inline int get_disk_ro(struct gendisk *disk)
 {
-	return disk->part0->bd_read_only;
+	return disk->part0->bd_read_only ||
+		test_bit(GD_READ_ONLY, &disk->state);
 }
 
 extern void disk_block_events(struct gendisk *disk);