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-rw-r--r--src/test/test-loop-block.c250
1 files changed, 250 insertions, 0 deletions
diff --git a/src/test/test-loop-block.c b/src/test/test-loop-block.c
new file mode 100644
index 0000000..298ded9
--- /dev/null
+++ b/src/test/test-loop-block.c
@@ -0,0 +1,250 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <fcntl.h>
+#include <linux/loop.h>
+#include <pthread.h>
+
+#include "alloc-util.h"
+#include "dissect-image.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "fs-util.h"
+#include "gpt.h"
+#include "missing_loop.h"
+#include "mkfs-util.h"
+#include "mount-util.h"
+#include "namespace-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "tests.h"
+#include "tmpfile-util.h"
+#include "user-util.h"
+#include "virt.h"
+
+#define N_THREADS 5
+#define N_ITERATIONS 3
+
+static usec_t end = 0;
+
+static void* thread_func(void *ptr) {
+ int fd = PTR_TO_FD(ptr);
+ int r;
+
+ for (unsigned i = 0; i < N_ITERATIONS; i++) {
+ _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
+ _cleanup_(umount_and_rmdir_and_freep) char *mounted = NULL;
+ _cleanup_(dissected_image_unrefp) DissectedImage *dissected = NULL;
+
+ if (now(CLOCK_MONOTONIC) >= end) {
+ log_notice("Time's up, exiting thread's loop");
+ break;
+ }
+
+ log_notice("> Thread iteration #%u.", i);
+
+ assert_se(mkdtemp_malloc(NULL, &mounted) >= 0);
+
+ r = loop_device_make(fd, O_RDONLY, 0, UINT64_MAX, LO_FLAGS_PARTSCAN, &loop);
+ if (r < 0)
+ log_error_errno(r, "Failed to allocate loopback device: %m");
+ assert_se(r >= 0);
+
+ log_notice("Acquired loop device %s, will mount on %s", loop->node, mounted);
+
+ r = dissect_image(loop->fd, NULL, NULL, DISSECT_IMAGE_READ_ONLY, &dissected);
+ if (r < 0)
+ log_error_errno(r, "Failed dissect loopback device %s: %m", loop->node);
+ assert_se(r >= 0);
+
+ log_info("Dissected loop device %s", loop->node);
+
+ for (PartitionDesignator d = 0; d < _PARTITION_DESIGNATOR_MAX; d++) {
+ if (!dissected->partitions[d].found)
+ continue;
+
+ log_notice("Found node %s fstype %s designator %s",
+ dissected->partitions[d].node,
+ dissected->partitions[d].fstype,
+ partition_designator_to_string(d));
+ }
+
+ assert_se(dissected->partitions[PARTITION_ESP].found);
+ assert_se(dissected->partitions[PARTITION_ESP].node);
+ assert_se(dissected->partitions[PARTITION_XBOOTLDR].found);
+ assert_se(dissected->partitions[PARTITION_XBOOTLDR].node);
+ assert_se(dissected->partitions[PARTITION_ROOT].found);
+ assert_se(dissected->partitions[PARTITION_ROOT].node);
+ assert_se(dissected->partitions[PARTITION_HOME].found);
+ assert_se(dissected->partitions[PARTITION_HOME].node);
+
+ r = dissected_image_mount(dissected, mounted, UID_INVALID, DISSECT_IMAGE_READ_ONLY);
+ log_notice_errno(r, "Mounted %s → %s: %m", loop->node, mounted);
+ assert_se(r >= 0);
+
+ log_notice("Unmounting %s", mounted);
+ mounted = umount_and_rmdir_and_free(mounted);
+
+ log_notice("Unmounted.");
+
+ dissected = dissected_image_unref(dissected);
+
+ log_notice("Detaching loop device %s", loop->node);
+ loop = loop_device_unref(loop);
+ log_notice("Detached loop device.");
+ }
+
+ log_notice("Leaving thread");
+
+ return NULL;
+}
+
+static bool have_root_gpt_type(void) {
+#ifdef GPT_ROOT_NATIVE
+ return true;
+#else
+ return false;
+#endif
+}
+
+int main(int argc, char *argv[]) {
+ _cleanup_free_ char *p = NULL, *cmd = NULL;
+ _cleanup_(pclosep) FILE *sfdisk = NULL;
+ _cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
+ _cleanup_close_ int fd = -1;
+ _cleanup_(dissected_image_unrefp) DissectedImage *dissected = NULL;
+ _cleanup_(umount_and_rmdir_and_freep) char *mounted = NULL;
+ pthread_t threads[N_THREADS];
+ const char *fs;
+ sd_id128_t id;
+ int r;
+
+ test_setup_logging(LOG_DEBUG);
+ log_show_tid(true);
+ log_show_time(true);
+
+ if (!have_root_gpt_type()) {
+ log_tests_skipped("No root partition GPT defined for this architecture, exiting.");
+ return EXIT_TEST_SKIP;
+ }
+
+ if (detect_container() > 0) {
+ log_tests_skipped("Test not supported in a container, requires udev/uevent notifications.");
+ return EXIT_TEST_SKIP;
+ }
+
+ if (strstr_ptr(ci_environment(), "autopkgtest")) {
+ // FIXME: we should reenable this one day
+ log_tests_skipped("Skipping test on Ubuntu autopkgtest CI, test too slow and installed udev too flakey.");
+ return EXIT_TEST_SKIP;
+ }
+
+ /* This is a test for the loopback block device setup code and it's use by the image dissection
+ * logic: since the kernel APIs are hard use and prone to races, let's test this in a heavy duty
+ * test: we open a bunch of threads and repeatedly allocate and deallocate loopback block devices in
+ * them in parallel, with an image file with a number of partitions. */
+
+ r = detach_mount_namespace();
+ if (ERRNO_IS_PRIVILEGE(r)) {
+ log_tests_skipped("Lacking privileges");
+ return EXIT_TEST_SKIP;
+ }
+
+ FOREACH_STRING(fs, "vfat", "ext4") {
+ r = mkfs_exists(fs);
+ assert_se(r >= 0);
+ if (!r) {
+ log_tests_skipped("mkfs.{vfat|ext4} not installed");
+ return EXIT_TEST_SKIP;
+ }
+ }
+
+ assert_se(r >= 0);
+
+ assert_se(tempfn_random_child("/var/tmp", "sfdisk", &p) >= 0);
+ fd = open(p, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOFOLLOW, 0666);
+ assert_se(fd >= 0);
+ assert_se(ftruncate(fd, 256*1024*1024) >= 0);
+
+ assert_se(cmd = strjoin("sfdisk ", p));
+ assert_se(sfdisk = popen(cmd, "we"));
+
+ /* A reasonably complex partition table that fits on a 64K disk */
+ fputs("label: gpt\n"
+ "size=32M, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B\n"
+ "size=32M, type=BC13C2FF-59E6-4262-A352-B275FD6F7172\n"
+ "size=32M, type=0657FD6D-A4AB-43C4-84E5-0933C84B4F4F\n"
+ "size=32M, type=", sfdisk);
+
+#ifdef GPT_ROOT_NATIVE
+ fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(GPT_ROOT_NATIVE));
+#else
+ fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(GPT_ROOT_X86_64));
+#endif
+
+ fputs("\n"
+ "size=32M, type=933AC7E1-2EB4-4F13-B844-0E14E2AEF915\n", sfdisk);
+
+ assert_se(pclose(sfdisk) == 0);
+ sfdisk = NULL;
+
+ assert_se(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, LO_FLAGS_PARTSCAN, &loop) >= 0);
+ assert_se(dissect_image(loop->fd, NULL, NULL, 0, &dissected) >= 0);
+
+ assert_se(dissected->partitions[PARTITION_ESP].found);
+ assert_se(dissected->partitions[PARTITION_ESP].node);
+ assert_se(dissected->partitions[PARTITION_XBOOTLDR].found);
+ assert_se(dissected->partitions[PARTITION_XBOOTLDR].node);
+ assert_se(dissected->partitions[PARTITION_ROOT].found);
+ assert_se(dissected->partitions[PARTITION_ROOT].node);
+ assert_se(dissected->partitions[PARTITION_HOME].found);
+ assert_se(dissected->partitions[PARTITION_HOME].node);
+
+ assert_se(sd_id128_randomize(&id) >= 0);
+ assert_se(make_filesystem(dissected->partitions[PARTITION_ESP].node, "vfat", "EFI", id, true) >= 0);
+
+ assert_se(sd_id128_randomize(&id) >= 0);
+ assert_se(make_filesystem(dissected->partitions[PARTITION_XBOOTLDR].node, "vfat", "xbootldr", id, true) >= 0);
+
+ assert_se(sd_id128_randomize(&id) >= 0);
+ assert_se(make_filesystem(dissected->partitions[PARTITION_ROOT].node, "ext4", "root", id, true) >= 0);
+
+ assert_se(sd_id128_randomize(&id) >= 0);
+ assert_se(make_filesystem(dissected->partitions[PARTITION_HOME].node, "ext4", "home", id, true) >= 0);
+
+ dissected = dissected_image_unref(dissected);
+ assert_se(dissect_image(loop->fd, NULL, NULL, 0, &dissected) >= 0);
+
+ assert_se(mkdtemp_malloc(NULL, &mounted) >= 0);
+
+ /* This first (writable) mount will initialize the mount point dirs, so that the subsequent read-only ones can work */
+ assert_se(dissected_image_mount(dissected, mounted, UID_INVALID, 0) >= 0);
+
+ assert_se(umount_recursive(mounted, 0) >= 0);
+ loop = loop_device_unref(loop);
+
+ log_notice("Threads are being started now");
+
+ /* Let's make sure we run for 10s on slow systems at max */
+ end = usec_add(now(CLOCK_MONOTONIC),
+ slow_tests_enabled() ? 5 * USEC_PER_SEC :
+ 1 * USEC_PER_SEC);
+
+ for (unsigned i = 0; i < N_THREADS; i++)
+ assert_se(pthread_create(threads + i, NULL, thread_func, FD_TO_PTR(fd)) == 0);
+
+ log_notice("All threads started now.");
+
+ for (unsigned i = 0; i < N_THREADS; i++) {
+ log_notice("Joining thread #%u.", i);
+
+ void *k;
+ assert_se(pthread_join(threads[i], &k) == 0);
+ assert_se(k == NULL);
+
+ log_notice("Joined thread #%u.", i);
+ }
+
+ log_notice("Threads are all terminated now.");
+
+ return 0;
+}
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