From d137057e215de10ee772852126075ce9575e908e Mon Sep 17 00:00:00 2001
From: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Date: Tue, 30 Nov 2021 19:03:29 +0300
Subject: [PATCH 059/120] zdtm: add ro-mount check after c/r to mntns_ghost01

This is a test for "ghost/mount: allocate remounted_rw in shmem to get
info from other processes" patch, without the patch test fails with:

  ############# Test zdtm/static/mntns_ghost01 FAIL at result check ##############
  Test output: ================================
  16:15:19.607:     5: ERR: mntns_ghost01.c:95: open for write on rofs -> 7 (errno = 11 (Resource temporarily unavailable))
  16:15:19.607:     4: FAIL: mntns_ghost01.c:121: Test died (errno = 11 (Resource temporarily unavailable))

Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
---
 test/zdtm/static/mntns_ghost01.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/test/zdtm/static/mntns_ghost01.c b/test/zdtm/static/mntns_ghost01.c
index 20397d543..2cc2270dd 100644
--- a/test/zdtm/static/mntns_ghost01.c
+++ b/test/zdtm/static/mntns_ghost01.c
@@ -6,6 +6,7 @@
 #include <sched.h>
 #include <sys/wait.h>
 #include <limits.h>
+#include <errno.h>
 
 #include "zdtmtst.h"
 
@@ -89,6 +90,13 @@ int main(int argc, char **argv)
 			return 1;
 		}
 
+		fd = open(ghost_path, O_CREAT | O_WRONLY, 0600);
+		if (fd >= 0 || errno != EROFS) {
+			pr_perror("open for write on rofs -> %d", fd);
+			close(fd);
+			return 1;
+		}
+
 		return 0;
 	}
 
-- 
2.34.1