[dm-devel] [RFC, PATCH] remove signal handling from dm-io.c, sync_io()

[Kevin Corry]

On Thursday 10 June 2004 5:18 pm, Kevin Corry wrote:
> On Thursday 10 June 2004 9:53 pm, Dave Olien wrote:
> > This patch removes the signal handling case from the sync_io() routine
> > in dm-io.c.  This seems appropriate for several reasons.
>
> Couldn't we also just convert that whole loop to a wait_event() call? The
> only real difference would be that the loop currently uses io_schedule(),
> whereas wait_event() would use regular schedule().  But perhaps that's a
> distinction we need to maintain.
>
> Here's the patch anyways for review.

And while we're in there hacking up that routine, we should probably add 
proper error handling instead of just using BUG_ON() in the event someone 
tries to read from multiple regions.

-- 
Kevin Corry
kevcorry at us.ibm.com
http://evms.sourceforge.net/


--- diff/drivers/md/dm-io.c	2004-06-10 17:28:19.113922632 +0000
+++ source/drivers/md/dm-io.c	2004-06-10 17:28:13.772734616 +0000
@@ -538,7 +538,9 @@
 	DECLARE_WAIT_QUEUE_HEAD(wq);
 	struct io io;
 
-	BUG_ON(num_regions > 1 && rw != WRITE);
+	if (num_regions > 1 && rw != WRITE) {
+		return -EIO;
+	}
 
 	io.error = 0;
 	atomic_set(&io.count, 1); /* see dispatch_io() */