md: Make calc_dev_sboffset() return a sector count.

As BLOCK_SIZE_BITS is 10 and

	MD_NEW_SIZE_SECTORS(2 * x) = 2 * NEW_SIZE_BLOCKS(x),

the return value of calc_dev_sboffset() doubles. Fix up all three
callers accordingly.

Signed-off-by: Andre Noll <maan@systemlinux.org>
Signed-off-by: Neil Brown <neilb@suse.de>

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 19f646a..3276edd 100644 (file)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -347,10 +347,11 @@ static struct mdk_personality *find_pers(int level, char *clevel)
        return NULL;
 }
 
+/* return the offset of the super block in 512byte sectors */
 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
 {
-       sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
-       return MD_NEW_SIZE_BLOCKS(size);
+       sector_t num_sectors = bdev->bd_inode->i_size / 512;
+       return MD_NEW_SIZE_SECTORS(num_sectors);
 }
 
 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
@@ -673,7 +674,7 @@ static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version
         *
         * It also happens to be a multiple of 4Kb.
         */
-       sb_offset = calc_dev_sboffset(rdev->bdev);
+       sb_offset = calc_dev_sboffset(rdev->bdev) / 2;
        rdev->sb_offset = sb_offset;
 
        ret = read_disk_sb(rdev, MD_SB_BYTES);
@@ -1006,7 +1007,7 @@ super_90_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size)
        size *= 2; /* convert to sectors */
        if (rdev->mddev->bitmap_offset)
                return 0; /* can't move bitmap */
-       rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
+       rdev->sb_offset = calc_dev_sboffset(rdev->bdev) / 2;
        if (!size || size > rdev->sb_offset*2)
                size = rdev->sb_offset*2;
        md_super_write(rdev->mddev, rdev, rdev->sb_offset << 1, rdev->sb_size,
@@ -4356,7 +4357,7 @@ static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
                        printk(KERN_INFO "md: nonpersistent superblock ...\n");
                        rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
                } else 
-                       rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
+                       rdev->sb_offset = calc_dev_sboffset(rdev->bdev) / 2;
                rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
 
                err = bind_rdev_to_array(rdev, mddev);
@@ -4423,7 +4424,7 @@ static int hot_add_disk(mddev_t * mddev, dev_t dev)
        }
 
        if (mddev->persistent)
-               rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
+               rdev->sb_offset = calc_dev_sboffset(rdev->bdev) / 2;
        else
                rdev->sb_offset =
                        rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;