bigfile: RAM must be explicitly free'ed after close

Else on-heap allocated RAM object is leaked. Fixes e.g. the following
error on ASAN:

	Direct leak of 56 byte(s) in 1 object(s) allocated from:
	    #0 0x7fc9ef390518 in calloc (/usr/lib/x86_64-linux-gnu/libasan.so.5+0xe9518)
	    #1 0x555ca792f309 in zalloc include/wendelin/utils.h:67
	    #2 0x555ca7935f9a in ram_limited_new bigfile/tests/../../t/t_utils.c:35
	    #3 0x555ca793a0ba in test_file_access_synthetic bigfile/tests/test_virtmem.c:292
	    #4 0x555ca7967bc4 in main bigfile/tests/test_virtmem.c:1121
	    #5 0x7fc9ef0e909a in __libc_start_main ../csu/libc-start.c:308

bigfile/tests/bench_virtmem.c

 /* Wendelin.bigfile | virtual memory benchmarks
- * Copyright (C) 2017  Nexedi SA and Contributors.
+ * Copyright (C) 2017-2019  Nexedi SA and Contributors.
  *                          Kirill Smelkov <kirr@nexedi.com>
  *
  * This program is free software: you can Use, Study, Modify and Redistribute
@@ -102,7 +102,7 @@ void bench_pagefault() {
     vma_unmap(vma);
     fileh_close(fh);
     ram_close(ram);
-
+    free(ram);
 }
 
 int main()

bigfile/tests/test_ram.c

@@ -148,6 +148,7 @@ int main()
 
     ramh_close(ramh);
     ram_close(ram);
+    free(ram);
 
     return 0;
 }

bigfile/tests/test_virtmem.c

 /* Wendelin.bigfile | virtual memory tests
- * Copyright (C) 2014-2015  Nexedi SA and Contributors.
+ * Copyright (C) 2014-2019  Nexedi SA and Contributors.
  *                          Kirill Smelkov <kirr@nexedi.com>
  *
  * This program is free software: you can Use, Study, Modify and Redistribute
@@ -907,8 +907,8 @@ void test_file_access_synthetic(void)
 
 
     /* free resources & restore SIGSEGV handler */
-    ram_close(ram);
-    ram_close(ram0);
+    ram_close(ram);  free(ram);
+    ram_close(ram0); free(ram0);
 
     ok1(!sigaction(SIGSEGV, &saveact, NULL));
 
@@ -1034,6 +1034,7 @@ void test_file_access_pagefault()
     fileh_close(fh);
     // ok1(list_empty(&ram->lru_list));
     ram_close(ram);
+    free(ram);
 }
 
 
@@ -1104,6 +1105,7 @@ void test_pagefault_savestate()
     vma_unmap(vma);
     fileh_close(fh);
     ram_close(ram);
+    free(ram);
 
 #undef  CHECK_PAGE
 #undef  CHECK_NOPAGE

include/wendelin/bigfile/ram.h

@@ -2,7 +2,7 @@
 #define _WENDELIN_BIGFILE_RAM_H_
 
 /* Wendelin.bigfile | Interfaces to work with RAM
- * Copyright (C) 2014-2015  Nexedi SA and Contributors.
+ * Copyright (C) 2014-2019  Nexedi SA and Contributors.
  *                          Kirill Smelkov <kirr@nexedi.com>
  *
  * This program is free software: you can Use, Study, Modify and Redistribute
@@ -92,9 +92,9 @@ size_t ram_get_current_maxsize(RAM *ram);
 RAMH *ramh_open(RAM *ram);
 
 
-/* close RAM
+/* ram_close releases resources associated with RAM.
  *
- * TODO text
+ * NOTE struct RAM itself is not released - it has to be explicitly freed by user.
  */
 void ram_close(RAM *ram);
 

t/t_utils.c

-/* Copyright (C) 2014-2015  Nexedi SA and Contributors.
+/* Copyright (C) 2014-2019  Nexedi SA and Contributors.
  *                          Kirill Smelkov <kirr@nexedi.com>
  *
  * This program is free software: you can Use, Study, Modify and Redistribute
@@ -95,8 +95,6 @@ void ram_limited_close(RAM *ram0)
 
     // XXX close if owning?
     // ram_close(ram->backend);
-
-    // TODO free(self) ?
 }