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md: raid5: avoid sector values going negative when testing reshape progress. 

As sector_t in unsigned, we cannot afford to let 'safepos' etc go
negative.
So replace
   a -= b;
by
   a -= min(b,a);

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-05-26 12:41:08 +10:00
parent b6a9ce688f
commit 848b318236
1 changed files with 3 additions and 3 deletions
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6
drivers/md/raid5.c
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@ -3811,13 +3811,13 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
safepos = conf->reshape_safe;
sector_div(safepos, data_disks);
if (mddev->delta_disks < 0) {
writepos -= reshape_sectors;
writepos -= min(reshape_sectors, writepos);
readpos += reshape_sectors;
safepos += reshape_sectors;
} else {
writepos += reshape_sectors;
readpos -= reshape_sectors;
safepos -= reshape_sectors;
readpos -= min(reshape_sectors, readpos);
safepos -= min(reshape_sectors, safepos);
}
/* 'writepos' is the most advanced device address we might write.