dm cache metadata: fail operations if fail_io mode has been established

commit 10add84e276432d9dd8044679a1028dd4084117e upstream.

Otherwise it is possible to trigger crashes due to the metadata being
inaccessible yet these methods don't safely account for that possibility
without these checks.

Reported-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/md/dm-cache-metadata.c b/drivers/md/dm-cache-metadata.c
index 695577812cf6..6937ca42be8c 100644
--- a/drivers/md/dm-cache-metadata.c
+++ b/drivers/md/dm-cache-metadata.c
@@ -1383,17 +1383,19 @@ void dm_cache_metadata_set_stats(struct dm_cache_metadata *cmd,
 
 int dm_cache_commit(struct dm_cache_metadata *cmd, bool clean_shutdown)
 {
-        int r;
+        int r = -EINVAL;
         flags_mutator mutator = (clean_shutdown ? set_clean_shutdown :
                                  clear_clean_shutdown);
 
         WRITE_LOCK(cmd);
+        if (cmd->fail_io)
+                goto out;
+
         r = __commit_transaction(cmd, mutator);
         if (r)
                 goto out;
 
         r = __begin_transaction(cmd);
-
 out:
         WRITE_UNLOCK(cmd);
         return r;
@@ -1405,7 +1407,8 @@ int dm_cache_get_free_metadata_block_count(struct dm_cache_metadata *cmd,
         int r = -EINVAL;
 
         READ_LOCK(cmd);
-        r = dm_sm_get_nr_free(cmd->metadata_sm, result);
+        if (!cmd->fail_io)
+                r = dm_sm_get_nr_free(cmd->metadata_sm, result);
         READ_UNLOCK(cmd);
 
         return r;
@@ -1417,7 +1420,8 @@ int dm_cache_get_metadata_dev_size(struct dm_cache_metadata *cmd,
         int r = -EINVAL;
 
         READ_LOCK(cmd);
-        r = dm_sm_get_nr_blocks(cmd->metadata_sm, result);
+        if (!cmd->fail_io)
+                r = dm_sm_get_nr_blocks(cmd->metadata_sm, result);
         READ_UNLOCK(cmd);
 
         return r;