linux-imx

/*

   raid0.c : Multiple Devices driver for Linux

         Copyright (C) 1994-96 Marc ZYNGIER

         <zyngier@ufr-info-p7.ibp.fr> or

         <maz@gloups.fdn.fr>

         Copyright (C) 1999, 2000 Ingo Molnar, Red Hat

​

   RAID-0 management functions.

​

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 2, or (at your option)

   any later version.

​

   You should have received a copy of the GNU General Public License

   (for example /usr/src/linux/COPYING); if not, write to the Free

   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

​

#include <linux/blkdev.h>

#include <linux/seq_file.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <trace/events/block.h>

#include "md.h"

#include "raid0.h"

#include "raid5.h"

​

#define UNSUPPORTED_MDDEV_FLAGS     \

    ((1L << MD_HAS_JOURNAL) |   \

     (1L << MD_JOURNAL_CLEAN) | \

     (1L << MD_FAILFAST_SUPPORTED) |\

     (1L << MD_HAS_PPL) |       \

     (1L << MD_HAS_MULTIPLE_PPLS))

​

static int raid0_congested(struct mddev *mddev, int bits)

{

    struct r0conf *conf = mddev->private;

    struct md_rdev **devlist = conf->devlist;

    int raid_disks = conf->strip_zone[0].nb_dev;

    int i, ret = 0;

​

    for (i = 0; i < raid_disks && !ret ; i++) {

        struct request_queue *q = bdev_get_queue(devlist[i]->bdev);

​

        ret |= bdi_congested(q->backing_dev_info, bits);

    }

    return ret;

}

​

/*

 * inform the user of the raid configuration

*/

static void dump_zones(struct mddev *mddev)

{

    int j, k;

    sector_t zone_size = 0;

    sector_t zone_start = 0;

    char b[BDEVNAME_SIZE];

    struct r0conf *conf = mddev->private;

    int raid_disks = conf->strip_zone[0].nb_dev;

    pr_debug("md: RAID0 configuration for %s - %d zone%s\n",

         mdname(mddev),