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block: don't look at the struct device dev_t in disk_devt

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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>
This commit is contained in:
Christoph Hellwig 2017-11-02 21:29:52 +03:00 committed by Jens Axboe
parent ef71de8b15
commit 517bf3c306
2 changed files with 1 additions and 5 deletions
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4
block/genhd.c
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@ -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);

2
include/linux/genhd.h
View File

@ -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)