From 8d30abff758b5f6c71343b7da6bb5de129a76c08 Mon Sep 17 00:00:00 2001 From: Joe Thornber Date: Wed, 4 Dec 2013 19:16:11 -0500 Subject: [PATCH] dm thin: return error from alloc_data_block if pool is not in write mode Signed-off-by: Joe Thornber Signed-off-by: Mike Snitzer --- drivers/md/dm-thin.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c index 5f1b11e45702..1988019df5c9 100644 --- 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; -- 2.34.1