On Sun, Nov 08, 2020 at 10:43:29PM +0800, 廖威雄 wrote: > > + const char devname[] = "/dev/pstore-blk"; > > + dev_t dev = name_to_dev_t(blkdev); > > + > > + if (!dev) > > + return; > > + init_unlink(devname); > > + init_mknod(devname, S_IFBLK | 0600, new_encode_dev(dev)); > > + __pstore_blk_init(devname); > > How about pstore/blk making /dev/pstore-blk node no matter build-in > or module. Then pstore/blk always opens /dev/pstore-blk. By this way, > blkdev can also be a device number if pstore/blk built as a module.
Please read the comment above blkdev_get_by_dev on why no one should add new interfaces based on the device number.
