block: don't look at the struct device dev_t in disk_devt (517bf3c3) · Commits · 戴 / test

The hidden gendisks introduced in the next patch need to keep the dev field in their struct device empty so that udev won't try to create block device nodes for them. To support that rewrite disk_devt to look at the major and first_minor fields in the gendisk itself instead of looking into the struct device. Signed-off-by:

Christoph Hellwig <hch@lst.de> Reviewed-by:

Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by:

Hannes Reinecke <hare@suse.com> Signed-off-by:

Jens Axboe <axboe@kernel.dk>

block/genhd.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -649,10 +649,6 @@ void device_add_disk(struct device parent, struct gendisk disk)
		return;
		}
		disk_to_dev(disk)->devt = devt;

		/* ->major and ->first_minor aren't supposed to be
		* dereferenced from here on, but set them just in case.
		*/
		disk->major = MAJOR(devt);
		disk->first_minor = MINOR(devt);

include/linux/genhd.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -234,7 +234,7 @@ static inline bool disk_part_scan_enabled(struct gendisk *disk)

		static inline dev_t disk_devt(struct gendisk *disk)
		{
		return disk_to_dev(disk)->devt;
		return MKDEV(disk->major, disk->first_minor);
		}

		static inline dev_t part_devt(struct hd_struct *part)

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