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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2026, Google LLC.
* Pasha Tatashin <pasha.tatashin@soleen.com>
*
* Validate that LUO can handle a large number of files per session across
* a kexec reboot.
*/
#include <stdio.h>
#include <unistd.h>
#include "luo_test_utils.h"
#define NUM_FILES 500
#define STATE_SESSION_NAME "kexec_many_files_state"
#define STATE_MEMFD_TOKEN 9999
#define TEST_SESSION_NAME "many_files_session"
/* Stage 1: Executed before the kexec reboot. */
static void run_stage_1(int luo_fd)
{
int session_fd, i;
ksft_print_msg("[STAGE 1] Creating state file for next stage (2)...\n");
create_state_file(luo_fd, STATE_SESSION_NAME, STATE_MEMFD_TOKEN, 2);
ksft_print_msg("[STAGE 1] Creating test session '%s'...\n", TEST_SESSION_NAME);
session_fd = luo_create_session(luo_fd, TEST_SESSION_NAME);
if (session_fd < 0)
fail_exit("luo_create_session");
ksft_print_msg("[STAGE 1] Preserving %d files...\n", NUM_FILES);
for (i = 0; i < NUM_FILES; i++) {
char data[64];
snprintf(data, sizeof(data), "file-data-%d", i);
if (create_and_preserve_memfd(session_fd, i, data) < 0)
fail_exit("create_and_preserve_memfd for index %d", i);
}
ksft_print_msg("[STAGE 1] Successfully preserved %d files.\n", NUM_FILES);
close(luo_fd);
daemonize_and_wait();
}
/* Stage 2: Executed after the kexec reboot. */
static void run_stage_2(int luo_fd, int state_session_fd)
{
int session_fd;
int i, stage;
ksft_print_msg("[STAGE 2] Starting post-kexec verification...\n");
restore_and_read_stage(state_session_fd, STATE_MEMFD_TOKEN, &stage);
if (stage != 2) {
fail_exit("Expected stage 2, but state file contains %d",
stage);
}
ksft_print_msg("[STAGE 2] Retrieving test session '%s'...\n", TEST_SESSION_NAME);
session_fd = luo_retrieve_session(luo_fd, TEST_SESSION_NAME);
if (session_fd < 0)
fail_exit("luo_retrieve_session");
ksft_print_msg("[STAGE 2] Verifying %d files...\n", NUM_FILES);
for (i = 0; i < NUM_FILES; i++) {
char data[64];
int fd;
snprintf(data, sizeof(data), "file-data-%d", i);
fd = restore_and_verify_memfd(session_fd, i, data);
if (fd < 0)
fail_exit("restore_and_verify_memfd for index %d", i);
close(fd);
}
ksft_print_msg("[STAGE 2] Finishing test session...\n");
if (luo_session_finish(session_fd) < 0)
fail_exit("luo_session_finish for test session");
close(session_fd);
ksft_print_msg("[STAGE 2] Finalizing state session...\n");
if (luo_session_finish(state_session_fd) < 0)
fail_exit("luo_session_finish for state session");
close(state_session_fd);
ksft_print_msg("\n--- MANY-FILES KEXEC TEST PASSED (%d files) ---\n",
NUM_FILES);
}
int main(int argc, char *argv[])
{
return luo_test(argc, argv, STATE_SESSION_NAME,
run_stage_1, run_stage_2);
}
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