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md: Allow read error in a single drive raid1 to be passed up.
If a raid1 only has a single working device and gets a read error, we choose to simply return that error up to the filesystem (or whatever) rather than failing the whole array. However the codes doesn't quite do that. We attempt a readbalance which allocates the same drive, so we retry the read - indefinitely. Instead: If read_balance in the error case chooses the same drive that just failed, treat it as a failure and don't retry. Signed-off-by: NeilBrown <neilb@suse.de>
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@ -1640,7 +1640,8 @@ static void raid1d(mddev_t *mddev)
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}
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bio = r1_bio->bios[r1_bio->read_disk];
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if ((disk=read_balance(conf, r1_bio)) == -1) {
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if ((disk=read_balance(conf, r1_bio)) == -1 ||
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disk == r1_bio->read_disk) {
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printk(KERN_ALERT "raid1: %s: unrecoverable I/O"
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" read error for block %llu\n",
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bdevname(bio->bi_bdev,b),
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