dm thin: return error from alloc_data_block if pool is not in write mode

Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
mariux64 · Jan 7, 2014 · 8d30abf · 8d30abf
1 parent 7f21466
commit 8d30abf
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
@@ -923,6 +923,9 @@ static int alloc_data_block(struct thin_c *tc, dm_block_t *result)
 	if (pool->no_free_space)
 		return -ENOSPC;
 
+	if (get_pool_mode(pool) != PM_WRITE)
+		return -EINVAL;
+
 	r = dm_pool_get_free_block_count(pool->pmd, &free_blocks);
 	if (r)
 		return r;