md: avoid overflow in raid0 calculation with large components

[sfrench/cifs-2.6.git] / drivers / md / raid0.c

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 678f4dbbea1d5c22082d13fb1afd321465b61f28..2c404f73a377d4c73ea95ecaf98e2c1c44f823f6 100644 (file)
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -60,6 +60,21 @@ static int raid0_issue_flush(request_queue_t *q, struct gendisk *disk,
        return ret;
 }
 
+static int raid0_congested(void *data, int bits)
+{
+       mddev_t *mddev = data;
+       raid0_conf_t *conf = mddev_to_conf(mddev);
+       mdk_rdev_t **devlist = conf->strip_zone[0].dev;
+       int i, ret = 0;
+
+       for (i = 0; i < mddev->raid_disks && !ret ; i++) {
+               request_queue_t *q = bdev_get_queue(devlist[i]->bdev);
+
+               ret |= bdi_congested(&q->backing_dev_info, bits);
+       }
+       return ret;
+}
+
 
 static int create_strip_zones (mddev_t *mddev)
 {
@@ -236,6 +251,8 @@ static int create_strip_zones (mddev_t *mddev)
        mddev->queue->unplug_fn = raid0_unplug;
 
        mddev->queue->issue_flush_fn = raid0_issue_flush;
+       mddev->queue->backing_dev_info.congested_fn = raid0_congested;
+       mddev->queue->backing_dev_info.congested_data = mddev;
 
        printk("raid0: done.\n");
        return 0;
@@ -331,13 +348,14 @@ static int raid0_run (mddev_t *mddev)
                goto out_free_conf;
        size = conf->strip_zone[cur].size;
 
-       for (i=0; i< nb_zone; i++) {
-               conf->hash_table[i] = conf->strip_zone + cur;
+       conf->hash_table[0] = conf->strip_zone + cur;
+       for (i=1; i< nb_zone; i++) {
                while (size <= conf->hash_spacing) {
                        cur++;
                        size += conf->strip_zone[cur].size;
                }
                size -= conf->hash_spacing;
+               conf->hash_table[i] = conf->strip_zone + cur;
        }
        if (conf->preshift) {
                conf->hash_spacing >>= conf->preshift;
@@ -397,7 +415,7 @@ static int raid0_make_request (request_queue_t *q, struct bio *bio)
        raid0_conf_t *conf = mddev_to_conf(mddev);
        struct strip_zone *zone;
        mdk_rdev_t *tmp_dev;
-       unsigned long chunk;
+       sector_t chunk;
        sector_t block, rsect;
        const int rw = bio_data_dir(bio);
 
@@ -452,7 +470,6 @@ static int raid0_make_request (request_queue_t *q, struct bio *bio)
 
                sector_div(x, zone->nb_dev);
                chunk = x;
-               BUG_ON(x != (sector_t)chunk);
 
                x = block >> chunksize_bits;
                tmp_dev = zone->dev[sector_div(x, zone->nb_dev)];