commit 2045e88edb4e0c9ce62d317f77dc59d27d9c530e
author Milan Broz <mbroz@redhat.com> Tue Jan 06 03:05:01 2009 +0000
committer Alasdair G Kergon <agk@redhat.com> Tue Jan 06 03:05:01 2009 +0000
tree 324eeea271b889263d0141fe0c82d4b0e43d0079
parent 6f3af01cb0eda0ec50fe1e4cbdf028269dc396fe

dm log: move region_size validation

Move log size validation from mirror target to log constructor.

Removed PAGE_SIZE restriction we no longer think necessary.

Signed-off-by: Milan Broz <mbroz@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>

drivers/md/dm-log.c

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 691cb9c..40ed70d 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -360,6 +360,17 @@
 	return 0;
 }
 
+static int _check_region_size(struct dm_target *ti, uint32_t region_size)
+{
+	if (region_size < 2 || region_size > ti->len)
+		return 0;
+
+	if (!is_power_of_2(region_size))
+		return 0;
+
+	return 1;
+}
+
 /*----------------------------------------------------------------
  * core log constructor/destructor
  *
@@ -395,8 +406,9 @@
 		}
 	}
 
-	if (sscanf(argv[0], "%u", &region_size) != 1) {
-		DMWARN("invalid region size string");
+	if (sscanf(argv[0], "%u", &region_size) != 1 ||
+	    !_check_region_size(ti, region_size)) {
+		DMWARN("invalid region size %s", argv[0]);
 		return -EINVAL;
 	}