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-rw-r--r--include/linux/genhd.h27
1 files changed, 21 insertions, 6 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index d1723c0..0ff7532 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -111,10 +111,14 @@ struct hd_struct {
#define GENHD_FL_FAIL 64
struct gendisk {
+ /* 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. */
+
char disk_name[32]; /* name of major driver */
struct hd_struct **part; /* [indexed by minor - 1] */
struct block_device_operations *fops;
@@ -152,6 +156,21 @@ static inline struct gendisk *part_to_disk(struct hd_struct *part)
return NULL;
}
+static inline int disk_max_parts(struct gendisk *disk)
+{
+ return disk->minors - 1;
+}
+
+static inline dev_t disk_devt(struct gendisk *disk)
+{
+ return disk->dev.devt;
+}
+
+static inline dev_t part_devt(struct hd_struct *part)
+{
+ return part->dev.devt;
+}
+
/*
* Macros to operate on percpu disk statistics:
*
@@ -163,7 +182,7 @@ static inline struct hd_struct *disk_map_sector(struct gendisk *gendiskp,
{
struct hd_struct *part;
int i;
- for (i = 0; i < gendiskp->minors - 1; i++) {
+ for (i = 0; i < disk_max_parts(gendiskp); i++) {
part = gendiskp->part[i];
if (part && part->start_sect <= sector
&& sector < part->start_sect + part->nr_sects)
@@ -366,6 +385,7 @@ extern void add_disk(struct gendisk *disk);
extern void del_gendisk(struct gendisk *gp);
extern void unlink_gendisk(struct gendisk *gp);
extern struct gendisk *get_gendisk(dev_t dev, int *partno);
+extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
extern void set_device_ro(struct block_device *bdev, int flag);
extern void set_disk_ro(struct gendisk *disk, int flag);
@@ -553,11 +573,6 @@ extern void blk_register_region(dev_t devt, unsigned long range,
void *data);
extern void blk_unregister_region(dev_t devt, unsigned long range);
-static inline struct block_device *bdget_disk(struct gendisk *disk, int partno)
-{
- return bdget(MKDEV(disk->major, disk->first_minor) + partno);
-}
-
#else /* CONFIG_BLOCK */
static inline void printk_all_partitions(void) { }