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Date:   Mon,  2 Aug 2021 17:46:43 -0400
From:   Gabriel Krisman Bertazi <>
        Gabriel Krisman Bertazi <>
Subject: [PATCH 5/7] syscalls/fanotify20: Support submission of debugfs commands

In order to test FAN_FS_ERROR, we want to corrupt the filesystem.  The
easiest way to do it is by using debugfs.  Add a small helper to issue
debugfs requests.  Since most likely this will be the only testcase to
need this, don't bother making it a proper helper for now.

Signed-off-by: Gabriel Krisman Bertazi <>
 testcases/kernel/syscalls/fanotify/fanotify20.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/testcases/kernel/syscalls/fanotify/fanotify20.c b/testcases/kernel/syscalls/fanotify/fanotify20.c
index 7a9601072139..e7ced28eb61d 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify20.c
+++ b/testcases/kernel/syscalls/fanotify/fanotify20.c
@@ -63,6 +63,13 @@ int fd_notify;
 #define EXT4_ERR_ESHUTDOWN 16
+static void do_debugfs_request(const char *dev, char *request)
+	char *cmd[] = {"debugfs", "-w", dev, "-R", request, NULL};
 static void trigger_fs_abort(void)
 	SAFE_MOUNT(tst_device->dev, MOUNT_PATH, tst_device->fs_type,

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