KVM: Fix off-by-one when writing to a nonpae guest pde

[powerpc.git] / drivers / md / raid10.c

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index a9401c0..82249a6 100644 (file)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -429,7 +429,7 @@ static sector_t raid10_find_virt(conf_t *conf, sector_t sector, int dev)
                if (dev < 0)
                        dev += conf->raid_disks;
        } else {
-               while (sector > conf->stride) {
+               while (sector >= conf->stride) {
                        sector -= conf->stride;
                        if (dev < conf->near_copies)
                                dev += conf->raid_disks - conf->near_copies;
@@ -1801,6 +1801,7 @@ static sector_t sync_request(mddev_t *mddev, sector_t sector_nr, int *skipped, i
                                                for (k=0; k<conf->copies; k++)
                                                        if (r10_bio->devs[k].devnum == i)
                                                                break;
+                                               BUG_ON(k == conf->copies);
                                                bio = r10_bio->devs[1].bio;
                                                bio->bi_next = biolist;
                                                biolist = bio;
@@ -2021,19 +2022,30 @@ static int run(mddev_t *mddev)
        if (!conf->tmppage)
                goto out_free_conf;
 
+       conf->mddev = mddev;
+       conf->raid_disks = mddev->raid_disks;
        conf->near_copies = nc;
        conf->far_copies = fc;
        conf->copies = nc*fc;
        conf->far_offset = fo;
        conf->chunk_mask = (sector_t)(mddev->chunk_size>>9)-1;
        conf->chunk_shift = ffz(~mddev->chunk_size) - 9;
+       size = mddev->size >> (conf->chunk_shift-1);
+       sector_div(size, fc);
+       size = size * conf->raid_disks;
+       sector_div(size, nc);
+       /* 'size' is now the number of chunks in the array */
+       /* calculate "used chunks per device" in 'stride' */
+       stride = size * conf->copies;
+       sector_div(stride, conf->raid_disks);
+       mddev->size = stride  << (conf->chunk_shift-1);
+
        if (fo)
-               conf->stride = 1 << conf->chunk_shift;
-       else {
-               stride = mddev->size >> (conf->chunk_shift-1);
+               stride = 1;
+       else
                sector_div(stride, fc);
-               conf->stride = stride << conf->chunk_shift;
-       }
+       conf->stride = stride << conf->chunk_shift;
+
        conf->r10bio_pool = mempool_create(NR_RAID10_BIOS, r10bio_pool_alloc,
                                                r10bio_pool_free, conf);
        if (!conf->r10bio_pool) {
@@ -2063,8 +2075,6 @@ static int run(mddev_t *mddev)
 
                disk->head_position = 0;
        }
-       conf->raid_disks = mddev->raid_disks;
-       conf->mddev = mddev;
        spin_lock_init(&conf->device_lock);
        INIT_LIST_HEAD(&conf->retry_list);
 
@@ -2106,16 +2116,8 @@ static int run(mddev_t *mddev)
        /*
         * Ok, everything is just fine now
         */
-       if (conf->far_offset) {
-               size = mddev->size >> (conf->chunk_shift-1);
-               size *= conf->raid_disks;
-               size <<= conf->chunk_shift;
-               sector_div(size, conf->far_copies);
-       } else
-               size = conf->stride * conf->raid_disks;
-       sector_div(size, conf->near_copies);
-       mddev->array_size = size/2;
-       mddev->resync_max_sectors = size;
+       mddev->array_size = size << (conf->chunk_shift-1);
+       mddev->resync_max_sectors = size << conf->chunk_shift;
 
        mddev->queue->unplug_fn = raid10_unplug;
        mddev->queue->issue_flush_fn = raid10_issue_flush;