block: replace @ext_minors with GENHD_FL_EXT_DEVT

With previous changes, it's meaningless to limit the number of
partitions.  Replace @ext_minors with GENHD_FL_EXT_DEVT such that
setting the flag allows the disk to have maximum number of allowed
partitions (only limited by the number of entries in parsed_partitions
as determined by MAX_PART constant).

This kills not-too-pretty alloc_disk_ext[_node]() functions and makes
@minors parameter to alloc_disk[_node]() unnecessary.  The parameter
is left alone to avoid disturbing the users.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 8 insertions, 8 deletions

diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index ecf649c3deed..04524c213de1 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -58,6 +58,8 @@ enum {
         UNIXWARE_PARTITION = 0x63,      /* Same as GNU_HURD and SCO Unix */
 };
 
+#define DISK_MAX_PARTS                  256
+
 #include <linux/major.h>
 #include <linux/device.h>
 #include <linux/smp.h>
@@ -112,6 +114,7 @@ struct hd_struct {
 #define GENHD_FL_CD                             8
 #define GENHD_FL_UP                             16
 #define GENHD_FL_SUPPRESS_PARTITION_INFO        32
+#define GENHD_FL_EXT_DEVT                       64 /* allow extended devt */
 
 #define BLK_SCSI_MAX_CMDS       (256)
 #define BLK_SCSI_CMD_PER_LONG   (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
@@ -129,15 +132,13 @@ struct disk_part_tbl {
 };
 
 struct gendisk {
-        /* major, first_minor, minors and ext_minors are input
-         * parameters only, don't use directly.  Use disk_devt() and
-         * disk_max_parts().
+        /* major, first_minor and minors are input parameters only,
+         * don't use directly.  Use disk_devt() and disk_max_parts().
          */
         int major;                      /* major number of driver */
         int first_minor;
         int minors;                     /* maximum number of minors, =1 for
                                          * disks that can't be partitioned. */
-        int ext_minors;                 /* number of extended dynamic minors */
 
         char disk_name[32];             /* name of major driver */
 
@@ -180,7 +181,9 @@ static inline struct gendisk *part_to_disk(struct hd_struct *part)
 
 static inline int disk_max_parts(struct gendisk *disk)
 {
-        return disk->minors + disk->ext_minors;
+        if (disk->flags & GENHD_FL_EXT_DEVT)
+                return DISK_MAX_PARTS;
+        return disk->minors;
 }
 
 static inline bool disk_partitionable(struct gendisk *disk)
@@ -527,9 +530,6 @@ extern void printk_all_partitions(void);
 
 extern struct gendisk *alloc_disk_node(int minors, int node_id);
 extern struct gendisk *alloc_disk(int minors);
-extern struct gendisk *alloc_disk_ext_node(int minors, int ext_minrs,
-                                           int node_id);
-extern struct gendisk *alloc_disk_ext(int minors, int ext_minors);
 extern struct kobject *get_disk(struct gendisk *disk);
 extern void put_disk(struct gendisk *disk);
 extern void blk_register_region(dev_t devt, unsigned long range,