Differential D25512 Diff 74498 stand/userboot/userboot/userboot_disk.c

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	userdisk_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,			userdisk_realstrategy(void *devdata, int rw, daddr_t dblk, size_t size,
	char buf, size_t rsize)			char buf, size_t rsize)
	{			{
	struct disk_devdesc *dev = devdata;			struct disk_devdesc *dev = devdata;
	uint64_t off;			uint64_t off;
	size_t resid;			size_t resid;
	int rc;			int rc;

	rw &= F_MASK;
	if (rw == F_WRITE)
	return (EROFS);
	if (rw != F_READ)
	return (EINVAL);
	if (rsize)			if (rsize)
	*rsize = 0;			*rsize = 0;
	off = dblk * ud_info[dev->dd.d_unit].sectorsize;			off = dblk * ud_info[dev->dd.d_unit].sectorsize;
				switch (rw & F_MASK) {
				case F_READ:
	rc = CALLBACK(diskread, dev->dd.d_unit, off, buf, size, &resid);			rc = CALLBACK(diskread, dev->dd.d_unit, off, buf, size, &resid);
				break;
				case F_WRITE:
				rc = CALLBACK(diskwrite, dev->dd.d_unit, off, buf, size,
				&resid);
				break;
				default:
				rc = EINVAL;
				break;
				}
	if (rc)			if (rc)
	return (rc);			return (rc);
	if (rsize)			if (rsize)
	*rsize = size - resid;			*rsize = size - resid;
	return (0);			return (0);
	}			}

	static int			static int
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