[LTP] [PATCH v1] listmount04.c: Update case support mnt_id_req.mnt_ns_fd

[Wei Gao]

On Fri, Nov 28, 2025 at 11:26:07AM +0800, Li Wang wrote:
> Hi Wei,
> 
> 
> On Thu, Nov 27, 2025 at 9:41 AM Wei Gao via ltp <ltp@lists.linux.it> wrote:
> 
> > New kernel commit lead test case failure with following error message:
> > listmount04.c:128: TFAIL: invalid mnt_id_req.spare expected EINVAL: EBADF
> > (9)
> >
> > Detail of new kernel commit:
> > commit: 78f0e33cd6c939a555aa80dbed2fec6b333a7660
> > fs/namespace: correctly handle errors returned by grab_requested_mnt_ns
> >
> > Signed-off-by: Wei Gao <wegao@suse.com>
> > ---
> >  configure.ac                                   |  1 +
> >  .../kernel/syscalls/listmount/listmount04.c    | 18 ++++++++++++------
> >  2 files changed, 13 insertions(+), 6 deletions(-)
> >
> > diff --git a/configure.ac b/configure.ac
> > index 0480f46ca..fcff90799 100644
> > --- a/configure.ac
> > +++ b/configure.ac
> > @@ -263,6 +263,7 @@ AC_CHECK_TYPES([struct cachestat],,,[#include
> > <sys/mman.h>])
> >
> >  # Defined in <linux/mount.h>, but include/lapi/mount.h includes
> > <sys/mount.h> */
> >  AC_CHECK_TYPES([struct mnt_id_req],,,[#include <sys/mount.h>])
> > +AC_CHECK_MEMBERS([struct mnt_id_req.mnt_ns_fd],,,[#include <sys/mount.h>])
> >  AC_CHECK_TYPES([struct statmount],,,[#include <sys/mount.h>])
> >  AC_CHECK_MEMBERS([struct statmount.mnt_ns_id],,,[#include <unistd.h>
> >  #include <linux/mount.h>])
> > diff --git a/testcases/kernel/syscalls/listmount/listmount04.c
> > b/testcases/kernel/syscalls/listmount/listmount04.c
> > index a52bad064..3be3be4f2 100644
> > --- a/testcases/kernel/syscalls/listmount/listmount04.c
> > +++ b/testcases/kernel/syscalls/listmount/listmount04.c
> > @@ -18,6 +18,7 @@
> >  #include "lapi/mount.h"
> >  #include "lapi/syscalls.h"
> >
> > +#ifdef HAVE_STRUCT_MNT_ID_REQ_MNT_NS_FD
> >  #define MNT_SIZE 32
> >
> >  static struct mnt_id_req *request;
> > @@ -26,7 +27,7 @@ static uint64_t mnt_ids[MNT_SIZE];
> >  static struct tcase {
> >         int req_usage;
> >         uint32_t size;
> > -       uint32_t spare;
> > +       uint32_t mnt_ns_fd;
> >         uint64_t mnt_id;
> >         uint64_t param;
> >         uint64_t *mnt_ids;
> > @@ -73,12 +74,12 @@ static struct tcase {
> >         {
> >                 .req_usage = 1,
> >                 .size = MNT_ID_REQ_SIZE_VER0,
> > -               .spare = -1,
> > +               .mnt_ns_fd = -1,
> >                 .mnt_id = LSMT_ROOT,
> >                 .mnt_ids = mnt_ids,
> >                 .nr_mnt_ids = MNT_SIZE,
> > -               .exp_errno = EINVAL,
> > -               .msg = "invalid mnt_id_req.spare",
> > +               .exp_errno = EBADF,
> > +               .msg = "invalid mnt_id_req.mnt_ns_fd bad file descriptor",
> >         },
> >         {
> >                 .req_usage = 1,
> > @@ -122,7 +123,7 @@ static void run(unsigned int n)
> >                 req->mnt_id = tc->mnt_id;
> >                 req->param = tc->param;
> >                 req->size = tc->size;
> > -               req->spare = tc->spare;
> > +               req->mnt_ns_fd = tc->mnt_ns_fd;
> >         }
> >
> >         TST_EXP_FAIL(tst_syscall(__NR_listmount, req, tc->mnt_ids,
> > @@ -133,9 +134,14 @@ static void run(unsigned int n)
> >  static struct tst_test test = {
> >         .test = run,
> >         .tcnt = ARRAY_SIZE(tcases),
> > -       .min_kver = "6.8",
> > +       .min_kver = "6.18",
> >
> 
> Reviewed-by: Li Wang <liwang@redhat.com>
> 
> This patch looks good, I have one question do we need to cover the 'spare'
> field test for kernels between 6.8 to 6.18?
I think only keep tracking latest feature's change can make our life
easy for this case :)
> 
> 
>         .bufs = (struct tst_buffers []) {
> >                 { &request, .size = MNT_ID_REQ_SIZE_VER0 },
> >                 {},
> >         },
> >  };
> > +
> > +#else
> > +       TST_TEST_TCONF(
> > +               "This system does not support mnt_id_req.mnt_ns_fd.");
> > +#endif /* HAVE_STRUCT_MNT_ID_REQ_MNT_NS_FD */
> > --
> > 2.51.0
> >
> >
> > --
> > Mailing list info: https://lists.linux.it/listinfo/ltp
> >
> >
> 
> -- 
> Regards,
> Li Wang