[LTP] [PATCH 4/5] fanotify21: Add test variants for FAN_REPORT_TID

[Jan Kara]

On Tue 16-06-26 02:06:28, AnonymeMeow wrote:
> Add test variants for FAN_REPORT_PIDFD combined with FAN_REPORT_TID,
> both with and without FAN_REPORT_FD_ERROR. Add PIDFD_THREAD fallback
> definition for old headers.
> 
> Signed-off-by: AnonymeMeow <anonymemeow@gmail.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@suse.cz>

								Honza

> ---
>  include/lapi/pidfd.h                          |  4 ++
>  .../kernel/syscalls/fanotify/fanotify21.c     | 56 ++++++++++++++-----
>  2 files changed, 47 insertions(+), 13 deletions(-)
> 
> diff --git a/include/lapi/pidfd.h b/include/lapi/pidfd.h
> index a3205032c..eb4e3466d 100644
> --- a/include/lapi/pidfd.h
> +++ b/include/lapi/pidfd.h
> @@ -43,6 +43,10 @@ struct pidfd_info {
>  # define PIDFD_NONBLOCK O_NONBLOCK
>  #endif
>  
> +#ifndef PIDFD_THREAD
> +# define PIDFD_THREAD O_EXCL
> +#endif
> +
>  #ifndef PIDFS_IOCTL_MAGIC
>  # define PIDFS_IOCTL_MAGIC	0xFF
>  #endif
> diff --git a/testcases/kernel/syscalls/fanotify/fanotify21.c b/testcases/kernel/syscalls/fanotify/fanotify21.c
> index 22f9767db..fd43c8c1c 100644
> --- a/testcases/kernel/syscalls/fanotify/fanotify21.c
> +++ b/testcases/kernel/syscalls/fanotify/fanotify21.c
> @@ -12,6 +12,7 @@
>   *
>   * NOTE: FAN_REPORT_PIDFD support was added in v5.15-rc1 in
>   * af579beb666a ("fanotify: add pidfd support to the fanotify API").
> + * FAN_REPORT_PIDFD combined with FAN_REPORT_TID is supported since v7.2-rc1.
>   */
>  
>  #define _GNU_SOURCE
> @@ -32,6 +33,9 @@
>  #define MOUNT_PATH	"fs_mnt"
>  #define TEST_FILE	MOUNT_PATH "/testfile"
>  
> +#define TST_VARIANT_FD_ERROR (tst_variant & 1)
> +#define TST_VARIANT_PIDFD_THREAD (tst_variant & 2)
> +
>  struct pidfd_fdinfo_t {
>  	int pos;
>  	int flags;
> @@ -67,6 +71,7 @@ static char event_buf[BUF_SZ];
>  static struct pidfd_fdinfo_t exp_pidfd_fdinfo;
>  
>  static int fd_error_unsupported;
> +static int thread_pidfd_unsupported;
>  
>  static struct tst_clone_args clone_args = {
>  	.flags = CLONE_NEWPID,
> @@ -90,21 +95,37 @@ static void read_pidfd_fdinfo(int pidfd, struct pidfd_fdinfo_t *pidfd_fdinfo)
>  static void generate_event(void)
>  {
>  	int fd;
> +	int pidfd;
> +
> +	pidfd = TST_VARIANT_PIDFD_THREAD ? SAFE_PIDFD_OPEN(tst_gettid(), PIDFD_THREAD)
> +					 : SAFE_PIDFD_OPEN(tst_getpid(), 0);
> +	read_pidfd_fdinfo(pidfd, &exp_pidfd_fdinfo);
> +	SAFE_CLOSE(pidfd);
>  
>  	/* Generate a single FAN_OPEN event on the watched object. */
>  	fd = SAFE_OPEN(TEST_FILE, O_RDONLY);
>  	SAFE_CLOSE(fd);
>  }
>  
> +static const char *test_variant_name(void)
> +{
> +	switch (tst_variant) {
> +	case 0: return "";
> +	case 1: return "(FAN_REPORT_FD_ERROR)";
> +	case 2: return "(FAN_REPORT_TID)";
> +	case 3: return "(FAN_REPORT_FD_ERROR | FAN_REPORT_TID)";
> +	}
> +	return NULL;
> +}
> +
>  static void do_setup(void)
>  {
> -	int pidfd;
>  	int init_flags = FAN_REPORT_PIDFD;
>  
>  	/* Bind mount so remount ro/rw always work */
>  	SAFE_MOUNT(MOUNT_PATH, MOUNT_PATH, "none", MS_BIND, NULL);
>  
> -	if (tst_variant) {
> +	if (TST_VARIANT_FD_ERROR) {
>  		fanotify_fd = -1;
>  		fd_error_unsupported = fanotify_init_flags_supported_on_fs(FAN_REPORT_FD_ERROR, ".");
>  		if (fd_error_unsupported)
> @@ -112,6 +133,15 @@ static void do_setup(void)
>  		init_flags |= FAN_REPORT_FD_ERROR;
>  	}
>  
> +	if (TST_VARIANT_PIDFD_THREAD) {
> +		fanotify_fd = -1;
> +		thread_pidfd_unsupported = fanotify_init_flags_supported_on_fs(
> +			FAN_REPORT_PIDFD | FAN_REPORT_TID, ".");
> +		if (thread_pidfd_unsupported)
> +			return;
> +		init_flags |= FAN_REPORT_TID;
> +	}
> +
>  	SAFE_TOUCH(TEST_FILE, 0666, NULL);
>  
>  	/*
> @@ -125,12 +155,6 @@ static void do_setup(void)
>  	fanotify_fd = SAFE_FANOTIFY_INIT(init_flags, O_RDWR);
>  	SAFE_FANOTIFY_MARK(fanotify_fd, FAN_MARK_ADD, FAN_OPEN, AT_FDCWD,
>  			   TEST_FILE);
> -
> -	pidfd = SAFE_PIDFD_OPEN(getpid(), 0);
> -
> -	read_pidfd_fdinfo(pidfd, &exp_pidfd_fdinfo);
> -
> -	SAFE_CLOSE(pidfd);
>  }
>  
>  static void do_test(unsigned int num)
> @@ -138,19 +162,25 @@ static void do_test(unsigned int num)
>  	int i = 0, len;
>  	struct test_case_t *tc = &test_cases[num];
>  	int nopidfd_err = tc->want_pidfd_err ?
> -			  (tst_variant ? -ESRCH : FAN_NOPIDFD) : 0;
> -	int fd_err = (tc->remount_ro && tst_variant) ? -EROFS : 0;
> +			  (TST_VARIANT_FD_ERROR ? -ESRCH : FAN_NOPIDFD) : 0;
> +	int fd_err = (tc->remount_ro && TST_VARIANT_FD_ERROR) ? -EROFS : 0;
>  	pid_t reader_pid;
>  	int reader_exit_status;
>  
>  	tst_res(TINFO, "Test #%d.%d: %s %s", num, tst_variant, tc->name,
> -			tst_variant ? "(FAN_REPORT_FD_ERROR)" : "");
> +		       test_variant_name());
>  
> -	if (fd_error_unsupported && tst_variant) {
> +	if (fd_error_unsupported && TST_VARIANT_FD_ERROR) {
>  		FANOTIFY_INIT_FLAGS_ERR_MSG(FAN_REPORT_FD_ERROR, fd_error_unsupported);
>  		return;
>  	}
>  
> +	if (thread_pidfd_unsupported && TST_VARIANT_PIDFD_THREAD) {
> +		FANOTIFY_INIT_FLAGS_ERR_MSG(
> +			FAN_REPORT_PIDFD | FAN_REPORT_TID, thread_pidfd_unsupported);
> +		return;
> +	}
> +
>  	/* remount ro/rw the bind mount */
>  	SAFE_MOUNT("none", MOUNT_PATH, "none", MS_BIND | MS_REMOUNT |
>  		   (tc->remount_ro ? MS_RDONLY : 0), NULL);
> @@ -333,7 +363,7 @@ static struct tst_test test = {
>  	.setup = do_setup,
>  	.test = do_test,
>  	.tcnt = ARRAY_SIZE(test_cases),
> -	.test_variants = 2,
> +	.test_variants = 4,
>  	.cleanup = do_cleanup,
>  	.all_filesystems = 1,
>  	.needs_root = 1,
> -- 
> 2.54.0
> 
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR