On Tue, Oct 26, 2021 at 9:43 PM Gabriel Krisman Bertazi
<krisman@xxxxxxxxxxxxx> wrote:
>
> 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 <krisman@xxxxxxxxxxxxx>
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
> ---
> changes since v1:
> - Add .needs_cmds to require debugfs
> ---
> testcases/kernel/syscalls/fanotify/fanotify20.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/testcases/kernel/syscalls/fanotify/fanotify20.c b/testcases/kernel/syscalls/fanotify/fanotify20.c
> index 220cd51419e8..7c4b01720654 100644
> --- a/testcases/kernel/syscalls/fanotify/fanotify20.c
> +++ b/testcases/kernel/syscalls/fanotify/fanotify20.c
> @@ -47,6 +47,13 @@ int fd_notify;
> /* These expected FIDs are common to multiple tests */
> static struct fanotify_fid_t null_fid;
>
> +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;
> @@ -216,7 +223,11 @@ 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
>
