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a36429971a
DISKSEQ is a reliable way to find out if we missed a uevent or not, as it's monotonically increasing. If we parse an event with a smaller or no sequence number, we know we need to wait longer. If we parse an event with a greater sequence number, we know we missed it and the device was reused.
251 lines
9.7 KiB
C
251 lines
9.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include <fcntl.h>
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#include <linux/loop.h>
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#include <pthread.h>
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#include "alloc-util.h"
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#include "dissect-image.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "gpt.h"
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#include "missing_loop.h"
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#include "mkfs-util.h"
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#include "mount-util.h"
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#include "namespace-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "tests.h"
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#include "tmpfile-util.h"
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#include "user-util.h"
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#include "virt.h"
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#define N_THREADS 5
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#define N_ITERATIONS 3
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static usec_t end = 0;
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static void* thread_func(void *ptr) {
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int fd = PTR_TO_FD(ptr);
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int r;
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for (unsigned i = 0; i < N_ITERATIONS; i++) {
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_cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
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_cleanup_(umount_and_rmdir_and_freep) char *mounted = NULL;
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_cleanup_(dissected_image_unrefp) DissectedImage *dissected = NULL;
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if (now(CLOCK_MONOTONIC) >= end) {
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log_notice("Time's up, exiting thread's loop");
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break;
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}
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log_notice("> Thread iteration #%u.", i);
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assert_se(mkdtemp_malloc(NULL, &mounted) >= 0);
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r = loop_device_make(fd, O_RDONLY, 0, UINT64_MAX, LO_FLAGS_PARTSCAN, &loop);
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if (r < 0)
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log_error_errno(r, "Failed to allocate loopback device: %m");
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assert_se(r >= 0);
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log_notice("Acquired loop device %s, will mount on %s", loop->node, mounted);
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r = dissect_image(loop->fd, NULL, NULL, loop->diskseq, loop->uevent_seqnum_not_before, loop->timestamp_not_before, DISSECT_IMAGE_READ_ONLY, &dissected);
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if (r < 0)
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log_error_errno(r, "Failed dissect loopback device %s: %m", loop->node);
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assert_se(r >= 0);
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log_info("Dissected loop device %s", loop->node);
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for (PartitionDesignator d = 0; d < _PARTITION_DESIGNATOR_MAX; d++) {
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if (!dissected->partitions[d].found)
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continue;
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log_notice("Found node %s fstype %s designator %s",
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dissected->partitions[d].node,
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dissected->partitions[d].fstype,
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partition_designator_to_string(d));
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}
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assert_se(dissected->partitions[PARTITION_ESP].found);
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assert_se(dissected->partitions[PARTITION_ESP].node);
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assert_se(dissected->partitions[PARTITION_XBOOTLDR].found);
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assert_se(dissected->partitions[PARTITION_XBOOTLDR].node);
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assert_se(dissected->partitions[PARTITION_ROOT].found);
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assert_se(dissected->partitions[PARTITION_ROOT].node);
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assert_se(dissected->partitions[PARTITION_HOME].found);
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assert_se(dissected->partitions[PARTITION_HOME].node);
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r = dissected_image_mount(dissected, mounted, UID_INVALID, UID_INVALID, DISSECT_IMAGE_READ_ONLY);
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log_notice_errno(r, "Mounted %s → %s: %m", loop->node, mounted);
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assert_se(r >= 0);
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log_notice("Unmounting %s", mounted);
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mounted = umount_and_rmdir_and_free(mounted);
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log_notice("Unmounted.");
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dissected = dissected_image_unref(dissected);
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log_notice("Detaching loop device %s", loop->node);
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loop = loop_device_unref(loop);
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log_notice("Detached loop device.");
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}
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log_notice("Leaving thread");
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return NULL;
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}
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static bool have_root_gpt_type(void) {
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#ifdef GPT_ROOT_NATIVE
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return true;
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#else
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return false;
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#endif
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}
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int main(int argc, char *argv[]) {
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_cleanup_free_ char *p = NULL, *cmd = NULL;
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_cleanup_(pclosep) FILE *sfdisk = NULL;
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_cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
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_cleanup_close_ int fd = -1;
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_cleanup_(dissected_image_unrefp) DissectedImage *dissected = NULL;
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_cleanup_(umount_and_rmdir_and_freep) char *mounted = NULL;
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pthread_t threads[N_THREADS];
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const char *fs;
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sd_id128_t id;
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int r;
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test_setup_logging(LOG_DEBUG);
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log_show_tid(true);
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log_show_time(true);
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if (!have_root_gpt_type()) {
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log_tests_skipped("No root partition GPT defined for this architecture, exiting.");
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return EXIT_TEST_SKIP;
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}
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if (detect_container() > 0) {
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log_tests_skipped("Test not supported in a container, requires udev/uevent notifications.");
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return EXIT_TEST_SKIP;
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}
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if (strstr_ptr(ci_environment(), "autopkgtest") || strstr_ptr(ci_environment(), "github-actions")) {
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// FIXME: we should reenable this one day
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log_tests_skipped("Skipping test on Ubuntu autopkgtest CI/GH Actions, test too slow and installed udev too flakey.");
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return EXIT_TEST_SKIP;
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}
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/* This is a test for the loopback block device setup code and it's use by the image dissection
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* logic: since the kernel APIs are hard use and prone to races, let's test this in a heavy duty
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* test: we open a bunch of threads and repeatedly allocate and deallocate loopback block devices in
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* them in parallel, with an image file with a number of partitions. */
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r = detach_mount_namespace();
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if (ERRNO_IS_PRIVILEGE(r)) {
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log_tests_skipped("Lacking privileges");
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return EXIT_TEST_SKIP;
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}
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FOREACH_STRING(fs, "vfat", "ext4") {
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r = mkfs_exists(fs);
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assert_se(r >= 0);
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if (!r) {
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log_tests_skipped("mkfs.{vfat|ext4} not installed");
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return EXIT_TEST_SKIP;
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}
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}
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assert_se(r >= 0);
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assert_se(tempfn_random_child("/var/tmp", "sfdisk", &p) >= 0);
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fd = open(p, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOFOLLOW, 0666);
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assert_se(fd >= 0);
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assert_se(ftruncate(fd, 256*1024*1024) >= 0);
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assert_se(cmd = strjoin("sfdisk ", p));
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assert_se(sfdisk = popen(cmd, "we"));
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/* A reasonably complex partition table that fits on a 64K disk */
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fputs("label: gpt\n"
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"size=32M, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B\n"
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"size=32M, type=BC13C2FF-59E6-4262-A352-B275FD6F7172\n"
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"size=32M, type=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F\n"
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"size=32M, type=", sfdisk);
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#ifdef GPT_ROOT_NATIVE
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fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(GPT_ROOT_NATIVE));
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#else
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fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(GPT_ROOT_X86_64));
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#endif
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fputs("\n"
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"size=32M, type=933AC7E1-2EB4-4F13-B844-0E14E2AEF915\n", sfdisk);
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assert_se(pclose(sfdisk) == 0);
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sfdisk = NULL;
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assert_se(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, LO_FLAGS_PARTSCAN, &loop) >= 0);
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assert_se(dissect_image(loop->fd, NULL, NULL, loop->diskseq, loop->uevent_seqnum_not_before, loop->timestamp_not_before, 0, &dissected) >= 0);
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assert_se(dissected->partitions[PARTITION_ESP].found);
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assert_se(dissected->partitions[PARTITION_ESP].node);
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assert_se(dissected->partitions[PARTITION_XBOOTLDR].found);
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assert_se(dissected->partitions[PARTITION_XBOOTLDR].node);
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assert_se(dissected->partitions[PARTITION_ROOT].found);
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assert_se(dissected->partitions[PARTITION_ROOT].node);
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assert_se(dissected->partitions[PARTITION_HOME].found);
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assert_se(dissected->partitions[PARTITION_HOME].node);
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assert_se(sd_id128_randomize(&id) >= 0);
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assert_se(make_filesystem(dissected->partitions[PARTITION_ESP].node, "vfat", "EFI", id, true) >= 0);
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assert_se(sd_id128_randomize(&id) >= 0);
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assert_se(make_filesystem(dissected->partitions[PARTITION_XBOOTLDR].node, "vfat", "xbootldr", id, true) >= 0);
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assert_se(sd_id128_randomize(&id) >= 0);
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assert_se(make_filesystem(dissected->partitions[PARTITION_ROOT].node, "ext4", "root", id, true) >= 0);
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assert_se(sd_id128_randomize(&id) >= 0);
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assert_se(make_filesystem(dissected->partitions[PARTITION_HOME].node, "ext4", "home", id, true) >= 0);
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dissected = dissected_image_unref(dissected);
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assert_se(dissect_image(loop->fd, NULL, NULL, loop->diskseq, loop->uevent_seqnum_not_before, loop->timestamp_not_before, 0, &dissected) >= 0);
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assert_se(mkdtemp_malloc(NULL, &mounted) >= 0);
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/* This first (writable) mount will initialize the mount point dirs, so that the subsequent read-only ones can work */
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assert_se(dissected_image_mount(dissected, mounted, UID_INVALID, UID_INVALID, 0) >= 0);
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assert_se(umount_recursive(mounted, 0) >= 0);
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loop = loop_device_unref(loop);
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log_notice("Threads are being started now");
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/* Let's make sure we run for 10s on slow systems at max */
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end = usec_add(now(CLOCK_MONOTONIC),
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slow_tests_enabled() ? 5 * USEC_PER_SEC :
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1 * USEC_PER_SEC);
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for (unsigned i = 0; i < N_THREADS; i++)
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assert_se(pthread_create(threads + i, NULL, thread_func, FD_TO_PTR(fd)) == 0);
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log_notice("All threads started now.");
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for (unsigned i = 0; i < N_THREADS; i++) {
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log_notice("Joining thread #%u.", i);
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void *k;
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assert_se(pthread_join(threads[i], &k) == 0);
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assert_se(k == NULL);
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log_notice("Joined thread #%u.", i);
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}
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log_notice("Threads are all terminated now.");
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return 0;
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}
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