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[dm-devel] [PATCH 2 of 2] DM Snapshot: check if chunk size not specified

Patch name: dm-snapshot-check-if-chunk-size-not-specified.patch

If we are creating snapshot with memory-stored exception store, fail if
the user didn't specify chunk size. Zero chunk size would probably crash
a lot of places in the rest of snapshot code.

Signed-off-by: Mikulas Patocka <mpatocka redhat com>
Reviewed-by: Jonathan Brassow <jbrassow redhat com>
Reviewed-by: Mike Snitzer <snitzer redhat com>

Index: linux-2.6/drivers/md/dm-snap.c
--- linux-2.6.orig/drivers/md/dm-snap.c
+++ linux-2.6/drivers/md/dm-snap.c
@@ -668,6 +668,11 @@ static int snapshot_ctr(struct dm_target
 	INIT_WORK(&s->queued_bios_work, flush_queued_bios);
+	if (!s->store->chunk_size) {
+		ti->error = "Chunk size not set";
+		goto bad_load_and_register;
+	}
 	/* Add snapshot to the list of snapshots for this origin */
 	/* Exceptions aren't triggered till snapshot_resume() is called */
 	if (register_snapshot(s)) {

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