static void status_resync(struct seq_file *seq, struct mddev *mddev)
{
	sector_t max_sectors, resync, res;
	unsigned long dt, db;
	sector_t rt;
	int scale;
	unsigned int per_milli;

	if (mddev->curr_resync <= 3)
		resync = 0;
	else
		resync = mddev->curr_resync
			- atomic_read(&mddev->recovery_active);

	if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ||
	    test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
		max_sectors = mddev->resync_max_sectors;
	else
		max_sectors = mddev->dev_sectors;

	WARN_ON(max_sectors == 0);
	/* Pick 'scale' such that (resync>>scale)*1000 will fit
	 * in a sector_t, and (max_sectors>>scale) will fit in a
	 * u32, as those are the requirements for sector_div.
	 * Thus 'scale' must be at least 10
	 */
	scale = 10;
	if (sizeof(sector_t) > sizeof(unsigned long)) {
		while ( max_sectors/2 > (1ULL<<(scale+32)))
			scale++;
	}
	res = (resync>>scale)*1000;
	sector_div(res, (u32)((max_sectors>>scale)+1));

	per_milli = res;
	{
		int i, x = per_milli/50, y = 20-x;
		seq_printf(seq, "[");
		for (i = 0; i < x; i++)
			seq_printf(seq, "=");
		seq_printf(seq, ">");
		for (i = 0; i < y; i++)
			seq_printf(seq, ".");
		seq_printf(seq, "] ");
	}
	seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
		   (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
		    "reshape" :
		    (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
		     "check" :
		     (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
		      "resync" : "recovery"))),
		   per_milli/10, per_milli % 10,
		   (unsigned long long) resync/2,
		   (unsigned long long) max_sectors/2);

	/*
	 * dt: time from mark until now
	 * db: blocks written from mark until now
	 * rt: remaining time
	 *
	 * rt is a sector_t, so could be 32bit or 64bit.
	 * So we divide before multiply in case it is 32bit and close
	 * to the limit.
	 * We scale the divisor (db) by 32 to avoid losing precision
	 * near the end of resync when the number of remaining sectors
	 * is close to 'db'.
	 * We then divide rt by 32 after multiplying by db to compensate.
	 * The '+1' avoids division by zero if db is very small.
	 */
	dt = ((jiffies - mddev->resync_mark) / HZ);
	if (!dt) dt++;
	db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
		- mddev->resync_mark_cnt;

	rt = max_sectors - resync;    /* number of remaining sectors */
	sector_div(rt, db/32+1);
	rt *= dt;
	rt >>= 5;

	seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60,
		   ((unsigned long)rt % 60)/6);

	seq_printf(seq, " speed=%ldK/sec", db/2/dt);
}

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