dm snapshot: test chunk size against both origin and snapshot

Validate chunk size against both origin and snapshot sector size

Don't allow chunk size smaller than either origin or snapshot logical
sector size. Reading or writing data not aligned to sector size is not
allowed and causes immediate errors.

This requires us to open the origin before initialising the
exception store and to export dm_snap_origin.

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Reviewed-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

1 files changed, 21 insertions, 15 deletions

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index a6ab98920cc3..a1f2ab553b92 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -148,6 +148,12 @@ struct dm_snapshot {
 #define RUNNING_MERGE          0
 #define SHUTDOWN_MERGE         1
 
+struct dm_dev *dm_snap_origin(struct dm_snapshot *s)
+{
+	return s->origin;
+}
+EXPORT_SYMBOL(dm_snap_origin);
+
 struct dm_dev *dm_snap_cow(struct dm_snapshot *s)
 {
 	return s->cow;
@@ -1065,10 +1071,6 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 		origin_mode = FMODE_WRITE;
 	}
 
-	origin_path = argv[0];
-	argv++;
-	argc--;
-
 	s = kmalloc(sizeof(*s), GFP_KERNEL);
 	if (!s) {
 		ti->error = "Cannot allocate snapshot context private "
@@ -1077,6 +1079,16 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 		goto bad;
 	}
 
+	origin_path = argv[0];
+	argv++;
+	argc--;
+
+	r = dm_get_device(ti, origin_path, origin_mode, &s->origin);
+	if (r) {
+		ti->error = "Cannot get origin device";
+		goto bad_origin;
+	}
+
 	cow_path = argv[0];
 	argv++;
 	argc--;
@@ -1097,12 +1109,6 @@ static int snapshot_ctr(struct dm_target *ti, unsigned int argc, char **argv)
 	argv += args_used;
 	argc -= args_used;
 
-	r = dm_get_device(ti, origin_path, origin_mode, &s->origin);
-	if (r) {
-		ti->error = "Cannot get origin device";
-		goto bad_origin;
-	}
-
 	s->ti = ti;
 	s->valid = 1;
 	s->active = 0;
@@ -1212,15 +1218,15 @@ bad_kcopyd:
 	dm_exception_table_exit(&s->complete, exception_cache);
 
 bad_hash_tables:
-	dm_put_device(ti, s->origin);
-
-bad_origin:
 	dm_exception_store_destroy(s->store);
 
 bad_store:
 	dm_put_device(ti, s->cow);
 
 bad_cow:
+	dm_put_device(ti, s->origin);
+
+bad_origin:
 	kfree(s);
 
 bad:
@@ -1314,12 +1320,12 @@ static void snapshot_dtr(struct dm_target *ti)
 
 	mempool_destroy(s->pending_pool);
 
-	dm_put_device(ti, s->origin);
-
 	dm_exception_store_destroy(s->store);
 
 	dm_put_device(ti, s->cow);
 
+	dm_put_device(ti, s->origin);
+
 	kfree(s);
 }