'this_sector' is a virtual (array) address while 'head_position' is
a physical (device) address, so substraction doesn't make any sense.
devs[slot].addr should be used instead of this_sector.

However, this patch doesn't make much practical different to the read
balancing due to the effects of later code.

Signed-off-by: Neil Brown <[EMAIL PROTECTED]>

### Diffstat output
 ./drivers/md/raid10.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

diff ./drivers/md/raid10.c~current~ ./drivers/md/raid10.c
--- ./drivers/md/raid10.c~current~      2005-08-02 15:22:31.000000000 +1000
+++ ./drivers/md/raid10.c       2005-08-02 15:22:31.000000000 +1000
@@ -538,7 +538,8 @@ static int read_balance(conf_t *conf, r1
        }
 
 
-       current_distance = abs(this_sector - conf->mirrors[disk].head_position);
+       current_distance = abs(r10_bio->devs[slot].addr -
+                              conf->mirrors[disk].head_position);
 
        /* Find the disk whose head is closest */
 
-
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