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selftests/namespaces: third listns() test

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Test listns() pagination.
List namespaces in batches.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-41-2e6f823ebdc0@kernel.org
Tested-by: syzbot@syzkaller.appspotmail.com
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-10-29 13:20:54 +01:00
parent 6a68c7f919
commit 46909d1343
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1 changed files with 53 additions and 0 deletions
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53
tools/testing/selftests/namespaces/listns_test.c
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@ -115,4 +115,57 @@ TEST(listns_filter_by_type)
}
}
/*
* Test listns() pagination.
* List namespaces in batches.
*/
TEST(listns_pagination)
{
struct ns_id_req req = {
.size = sizeof(req),
.spare = 0,
.ns_id = 0,
.ns_type = 0,
.spare2 = 0,
.user_ns_id = 0,
};
__u64 batch1[2], batch2[2];
ssize_t ret1, ret2;
/* Get first batch */
ret1 = sys_listns(&req, batch1, ARRAY_SIZE(batch1), 0);
if (ret1 < 0) {
if (errno == ENOSYS)
SKIP(return, "listns() not supported");
TH_LOG("listns failed: %s (errno=%d)", strerror(errno), errno);
ASSERT_TRUE(false);
}
ASSERT_GE(ret1, 0);
if (ret1 == 0)
SKIP(return, "No namespaces found");
TH_LOG("First batch: %zd namespaces", ret1);
/* Get second batch using last ID from first batch */
if (ret1 == ARRAY_SIZE(batch1)) {
req.ns_id = batch1[ret1 - 1];
ret2 = sys_listns(&req, batch2, ARRAY_SIZE(batch2), 0);
ASSERT_GE(ret2, 0);
TH_LOG("Second batch: %zd namespaces (after ns_id=%llu)",
ret2, (unsigned long long)req.ns_id);
/* If we got more results, verify IDs are monotonically increasing */
if (ret2 > 0) {
ASSERT_GT(batch2[0], batch1[ret1 - 1]);
TH_LOG("Pagination working: %llu > %llu",
(unsigned long long)batch2[0],
(unsigned long long)batch1[ret1 - 1]);
}
} else {
TH_LOG("All namespaces fit in first batch");
}
}
TEST_HARNESS_MAIN