From e897b9b1334bab7427f062e4ec1f4297676c60da Mon Sep 17 00:00:00 2001 From: Amir Goldstein Date: Fri, 9 May 2025 15:32:38 +0200 Subject: selftests/filesystems: create get_unique_mnt_id() helper Add helper to utils.c and use it in mount-notify and statmount tests. Linking with utils.c drags in a dependecy with libcap, so add it to the Makefile of the tests. Reviewed-by: John Hubbard Signed-off-by: Amir Goldstein Link: https://lore.kernel.org/20250509133240.529330-7-amir73il@gmail.com Reviewed-by: Christian Brauner Signed-off-by: Christian Brauner --- tools/testing/selftests/filesystems/utils.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'tools/testing/selftests/filesystems/utils.c') diff --git a/tools/testing/selftests/filesystems/utils.c b/tools/testing/selftests/filesystems/utils.c index e553c89c5b19..5a114af822af 100644 --- a/tools/testing/selftests/filesystems/utils.c +++ b/tools/testing/selftests/filesystems/utils.c @@ -19,6 +19,8 @@ #include #include +#include "../kselftest.h" +#include "wrappers.h" #include "utils.h" #define MAX_USERNS_LEVEL 32 @@ -499,3 +501,23 @@ out: cap_free(caps); return fret; } + +uint64_t get_unique_mnt_id(const char *path) +{ + struct statx sx; + int ret; + + ret = statx(AT_FDCWD, path, 0, STATX_MNT_ID_UNIQUE, &sx); + if (ret == -1) { + ksft_print_msg("retrieving unique mount ID for %s: %s\n", path, + strerror(errno)); + return 0; + } + + if (!(sx.stx_mask & STATX_MNT_ID_UNIQUE)) { + ksft_print_msg("no unique mount ID available for %s\n", path); + return 0; + } + + return sx.stx_mnt_id; +} -- cgit v1.2.3