linux-ext4 - [PATCH v3 6/9] syscalls/fanotify21: Support submission of debugfs commands

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Date:   Fri, 29 Oct 2021 18:17:29 -0300
From:   Gabriel Krisman Bertazi <krisman@...labora.com>
To:     jack@...e.com, amir73il@...il.com, repnop@...gle.com
Cc:     ltp@...ts.linux.it, khazhy@...gle.com, kernel@...labora.com,
        linux-ext4@...r.kernel.org,
        Gabriel Krisman Bertazi <krisman@...labora.com>
Subject: [PATCH v3 6/9] syscalls/fanotify21: 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.

Reviewed-by: Amir Goldstein <amir73il@...il.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
---
changes since v1:
  - Add .needs_cmds to require debugfs
---
 testcases/kernel/syscalls/fanotify/fanotify21.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/fanotify/fanotify21.c b/testcases/kernel/syscalls/fanotify/fanotify21.c
index 95c988821a34..43e606c27372 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify21.c
+++ b/testcases/kernel/syscalls/fanotify/fanotify21.c
@@ -49,6 +49,13 @@ static void trigger_fs_abort(void)
                   MS_REMOUNT|MS_RDONLY, "abort");
 }
 
+static void do_debugfs_request(const char *dev, char *request)
+{
+	const char *cmd[] = {"debugfs", "-w", dev, "-R", request, NULL};
+
+	SAFE_CMD(cmd, NULL, NULL);
+}
+
 static struct test_case {
 	char *name;
 	int error;
@@ -228,7 +235,11 @@ static struct tst_test test = {
 	.mntpoint = MOUNT_PATH,
 	.all_filesystems = 0,
 	.needs_root = 1,
-	.dev_fs_type = "ext4"
+	.dev_fs_type = "ext4",
+	.needs_cmds = (const char *[]) {
+		"debugfs",
+		NULL
+	}
 };
 
 #else
-- 
2.33.0