Commit 6e9eac2d authored May 08, 2015 by NeilBrown

md/raid5: don't record new size if resize_stripes fails.



If any memory allocation in resize_stripes fails we will return
-ENOMEM, but in some cases we update conf->pool_size anyway.

This means that if we try again, the allocations will be assumed
to be larger than they are, and badness results.

So only update pool_size if there is no error.

This bug was introduced in 2.6.17 and the patch is suitable for
-stable.

Fixes: ad01c9e3 ("[PATCH] md: Allow stripes to be expanded in preparation for expanding an array")
Cc: stable@vger.kernel.org (v2.6.17+)
Signed-off-by: NeilBrown <neilb@suse.de>

parent 10d82c5f

drivers/md/raid5.c

+2 −1

Original line number	Original line	Diff line number	Diff line
	@@ -2216,6 +2216,7 @@ static int resize_stripes(struct r5conf *conf, int newsize)

	conf->slab_cache = sc;		conf->slab_cache = sc;
	conf->active_name = 1-conf->active_name;		conf->active_name = 1-conf->active_name;
			if (!err)
	conf->pool_size = newsize;		conf->pool_size = newsize;
	return err;		return err;
	}		}

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