test: improve filesystem tests

- Add a final check to see whether the fs daemon is still there.
- Other misc updates.

tests/check_fs_regrw.c

@@ -122,7 +122,7 @@ do_check_fs_regrw (
 #ifndef O_DIRECT
 #  define O_DIRECT  0
 #endif
-    int fd = open(path, O_RDWR | O_TRUNC | O_DIRECT);
+    int fd = open(path, O_RDWR | O_CREAT | O_TRUNC | O_DIRECT);
     ASSERT_NE(-1, fd);
 
     struct stat stat_buf;

tests/fs_regrw.at

@@ -19,7 +19,6 @@ ATX_CHECK_FS_NEW_ANY([file_max=524288], [
     echo "prng seed: $seed"
 
     ATX_RUN([
-        touch $name
         check-fs regrw -n 524288 -s "$seed" $name
     ])
 ])

tests/testsuite.at

@@ -139,6 +139,7 @@ m4_define([ATX_CHECK_FS], [
             fi
         done
         $6
+        ATX_RUN_ONE([check-fs ismount "$4"])
     ], [
         umount "$4"
     ])