[LTP] [PATCH 1/1] fanotify: Fix for musl

[Petr Vorel <petr.vorel@gmail.com>]

FSID_VAL_MEMBER() wrapper was meant to be only for struct
fanotify_event_info_fid, it was used also for struct event_t
(which has also __kernel_fsid_t fsid, but shouldn't be redefined).

This caused error on recent musl v1.1.23 (with f67b3c17),
which has struct fanotify_event_info_fid.

Fixes: 0498fc0a8 ("fanotify: Detect val vs. __val
fanotify_event_info_fid.fsid member")

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
---
Hi,

I'm sorry, one more error sneaked in.
I accidentally tested it on toolchains which has older musl release.

Helper should have obvious name to show it's just for fanotify_event_info_fid,
but something like EVENT_INFO_FID_FSID_VAL_MEMBER() is too long.
Posting just in case you prefer renaming (fanotify.h is getting a bit
complicated).

NOTE: I also find in various uclibc arch dependent kernel_types.h headers
libc/sysdeps/linux/x86_64/bits/kernel_types.h (19 of 29 archs)
typedef struct {
#ifdef __USE_ALL
	int val[2];
#else
	int __val[2];
#endif
} __kernel_fsid_t;

which would suggest we need also detection and helper for general
__kernel_fsid_t usage. But I'd ignore it unless anybody reports it's
really needed. I haven't found whether __USE_ALL is set as default, but
I expect it so.

Kind regards,
Petr

 testcases/kernel/syscalls/fanotify/fanotify.h   | 1 +
 testcases/kernel/syscalls/fanotify/fanotify13.c | 4 ++--
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/testcases/kernel/syscalls/fanotify/fanotify.h b/testcases/kernel/syscalls/fanotify/fanotify.h
index 5370e30bb..9c98aaa1d 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify.h
+++ b/testcases/kernel/syscalls/fanotify/fanotify.h
@@ -143,6 +143,7 @@ struct fanotify_event_info_fid {
 };
 #endif /* HAVE_STRUCT_FANOTIFY_EVENT_INFO_FID */
 
+/* NOTE: only for struct fanotify_event_info_fid */
 #ifdef HAVE_STRUCT_FANOTIFY_EVENT_INFO_FID_FSID___VAL
 # define FSID_VAL_MEMBER(fsid, i) (fsid.__val[i])
 #else
diff --git a/testcases/kernel/syscalls/fanotify/fanotify13.c b/testcases/kernel/syscalls/fanotify/fanotify13.c
index 26212ab62..3d8de6009 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify13.c
+++ b/testcases/kernel/syscalls/fanotify/fanotify13.c
@@ -130,8 +130,8 @@ static int setup_marks(unsigned int fd, struct test_case_t *tc)
 					"kernel");
 				return 1;
 			} else if (errno == ENODEV &&
-					!FSID_VAL_MEMBER(event_set[i].fsid, 0) &&
-					!FSID_VAL_MEMBER(event_set[i].fsid, 1)) {
+					!event_set[i].fsid.val[0] &&
+					!event_set[i].fsid.val[1]) {
 				tst_res(TCONF,
 					"FAN_REPORT_FID not supported on "
 					"filesystem type %s",
-- 
2.24.0