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[PATCH] md: fix minor error in raid10 read-balancing calculation.

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'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 <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
2005-09-09 16:23:40 -07:00
committed by Linus Torvalds
parent 486a153f0e
commit 3ec67ac1a3
1 changed files with 2 additions and 1 deletions
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3
drivers/md/raid10.c
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@@ -538,7 +538,8 @@ static int read_balance(conf_t *conf, r10bio_t *r10_bio)
} }
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 */ /* Find the disk whose head is closest */