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systemd/src/test/test-loop-util.c
T
Clayton Craft 47d408163b loop-util: don't reuse partition fd when partscan needed 
Some devices (e.g. android phones running pmOS) cannot have their OEM
partition table altered without breaking the firmware, so the distros's
partitions live inside a nested GPT carved into one of the OEM
partitions. Exposing these subpartitions requires wrapping the outer
partition in a loop device with partscan enabled, since the kernel does
not go into nested partition tables.

systemd already detects this case in udev-builtin-blkid
(ID_PART_GPT_AUTO_ROOT_DISK_NEEDS_LOOP) and acts on with
systemd-loop@.service, but this fails towards the end.
loop_device_make_internal has an optimization where if the input is
already a block device with a matching sector size, it skips creating
a loop and just hands back the original fd. That's fine for whole disks
but wrong for partitions, which don't support partscan, so this causes
dissect_image to fail with EPROTONOSUPPORT.

This patch changes the behavior to only take the shortcut when the input
is a whole disk, or when partscan was not requested.

Co-Authored-By: Clayton Craft <clayton@craftyguy.net>
2026-04-28 15:25:07 +01:00

575 lines
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <fcntl.h>
#include <linux/fs.h>
#include <linux/loop.h>
#include <pthread.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "alloc-util.h"
#include "argv-util.h"
#include "capability-util.h"
#include "dissect-image.h"
#include "fd-util.h"
#include "gpt.h"
#include "loop-util.h"
#include "mkfs-util.h"
#include "mount-util.h"
#include "namespace-util.h"
#include "parse-util.h"
#include "path-util.h"
#include "string-util.h"
#include "strv.h"
#include "tests.h"
#include "time-util.h"
#include "tmpfile-util.h"
#include "virt.h"
static unsigned arg_n_threads = 5;
static unsigned arg_n_iterations = 3;
static usec_t arg_timeout = 0;
#if HAVE_BLKID
static usec_t end = 0;
static void verify_dissected_image(DissectedImage *dissected) {
ASSERT_TRUE(dissected->partitions[PARTITION_ESP].found);
ASSERT_NOT_NULL(dissected->partitions[PARTITION_ESP].node);
ASSERT_TRUE(dissected->partitions[PARTITION_XBOOTLDR].found);
ASSERT_NOT_NULL(dissected->partitions[PARTITION_XBOOTLDR].node);
ASSERT_TRUE(dissected->partitions[PARTITION_ROOT].found);
ASSERT_NOT_NULL(dissected->partitions[PARTITION_ROOT].node);
ASSERT_TRUE(dissected->partitions[PARTITION_HOME].found);
ASSERT_NOT_NULL(dissected->partitions[PARTITION_HOME].node);
}
static void verify_dissected_image_harder(DissectedImage *dissected) {
verify_dissected_image(dissected);
ASSERT_STREQ(dissected->partitions[PARTITION_ESP].fstype, "vfat");
ASSERT_STREQ(dissected->partitions[PARTITION_XBOOTLDR].fstype, "vfat");
ASSERT_STREQ(dissected->partitions[PARTITION_ROOT].fstype, "ext4");
ASSERT_STREQ(dissected->partitions[PARTITION_HOME].fstype, "ext4");
}
static void* thread_func(void *ptr) {
int fd = PTR_TO_FD(ptr);
for (unsigned i = 0; i < arg_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_OK(mkdtemp_malloc(NULL, &mounted));
ASSERT_OK(loop_device_make(fd, O_RDONLY, 0, UINT64_MAX, 0, LO_FLAGS_PARTSCAN, LOCK_SH, &loop));
ASSERT_NOT_NULL(loop->dev);
ASSERT_NOT_NULL(loop->backing_file);
log_notice("Acquired loop device %s, will mount on %s", loop->node, mounted);
ASSERT_OK(dissect_loop_device(
loop,
/* verity= */ NULL,
/* mount_options= */ NULL,
/* image_policy= */ NULL,
/* image_filter= */ NULL,
DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_ADD_PARTITION_DEVICES|DISSECT_IMAGE_PIN_PARTITION_DEVICES,
&dissected));
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));
}
verify_dissected_image(dissected);
ASSERT_OK(dissected_image_mount(
dissected,
mounted,
/* uid_shift= */ UID_INVALID,
/* uid_range= */ UID_INVALID,
/* userns_fd= */ -EBADF,
DISSECT_IMAGE_READ_ONLY));
/* Now the block device is mounted, we don't need no manual lock anymore, the devices are now
* pinned by the mounts. */
ASSERT_OK(loop_device_flock(loop, LOCK_UN));
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;
}
#endif
static bool have_root_gpt_type(void) {
#ifdef SD_GPT_ROOT_NATIVE
return true;
#else
return false;
#endif
}
static int intro(void) {
int r;
log_show_tid(true);
log_show_time(true);
log_show_color(true);
if (saved_argc >= 2) {
r = safe_atou(saved_argv[1], &arg_n_threads);
if (r < 0)
return log_error_errno(r, "Failed to parse first argument (number of threads): %s", saved_argv[1]);
if (arg_n_threads <= 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Number of threads must be at least 1, refusing.");
}
if (saved_argc >= 3) {
r = safe_atou(saved_argv[2], &arg_n_iterations);
if (r < 0)
return log_error_errno(r, "Failed to parse second argument (number of iterations): %s", saved_argv[2]);
if (arg_n_iterations <= 0)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Number of iterations must be at least 1, refusing.");
}
if (saved_argc >= 4) {
r = parse_sec(saved_argv[3], &arg_timeout);
if (r < 0)
return log_error_errno(r, "Failed to parse third argument (timeout): %s", saved_argv[3]);
}
if (saved_argc >= 5)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Too many arguments (expected 3 at max).");
if (!have_root_gpt_type())
return log_tests_skipped("No root partition GPT defined for this architecture");
r = find_executable("sfdisk", NULL);
if (r < 0)
return log_tests_skipped_errno(r, "Could not find sfdisk command");
return EXIT_SUCCESS;
}
TEST(loop_block) {
#if HAVE_BLKID
_cleanup_(dissected_image_unrefp) DissectedImage *dissected = NULL;
_cleanup_(umount_and_rmdir_and_freep) char *mounted = NULL;
pthread_t threads[arg_n_threads];
sd_id128_t id;
#endif
_cleanup_free_ char *p = NULL, *cmd = NULL;
_cleanup_pclose_ FILE *sfdisk = NULL;
_cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
_cleanup_close_ int fd = -EBADF;
ASSERT_OK(tempfn_random_child("/var/tmp", "sfdisk", &p));
fd = ASSERT_OK_ERRNO(open(p, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOFOLLOW, 0666));
ASSERT_OK_ERRNO(ftruncate(fd, 256*1024*1024));
cmd = ASSERT_NOT_NULL(strjoin("sfdisk ", p));
sfdisk = ASSERT_NOT_NULL(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 SD_GPT_ROOT_NATIVE
fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(SD_GPT_ROOT_NATIVE));
#else
fprintf(sfdisk, SD_ID128_UUID_FORMAT_STR, SD_ID128_FORMAT_VAL(SD_GPT_ROOT_X86_64));
#endif
fputs("\n"
"size=32M, type=933AC7E1-2EB4-4F13-B844-0E14E2AEF915\n", sfdisk);
ASSERT_EQ(pclose(sfdisk), 0);
sfdisk = NULL;
#if HAVE_BLKID
ASSERT_OK(dissect_image_file(
p,
/* verity= */ NULL,
/* mount_options= */ NULL,
/* image_policy= */ NULL,
/* image_filter= */ NULL,
/* flags= */ 0,
&dissected));
verify_dissected_image(dissected);
dissected = dissected_image_unref(dissected);
#endif
if (have_effective_cap(CAP_SYS_ADMIN) <= 0) {
log_tests_skipped("not running privileged");
return;
}
if (detect_container() != 0 || running_in_chroot() != 0) {
log_tests_skipped("Test not supported in a container/chroot, requires udev/uevent notifications");
return;
}
ASSERT_OK(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 0, LO_FLAGS_PARTSCAN, LOCK_EX, &loop));
#if HAVE_BLKID
ASSERT_OK(dissect_loop_device(
loop,
/* verity= */ NULL,
/* mount_options= */ NULL,
/* image_policy= */ NULL,
/* image_filter= */ NULL,
DISSECT_IMAGE_ADD_PARTITION_DEVICES|DISSECT_IMAGE_PIN_PARTITION_DEVICES,
&dissected));
verify_dissected_image(dissected);
FOREACH_STRING(fs, "vfat", "ext4") {
if (ASSERT_OK(mkfs_exists(fs)) == 0) {
log_tests_skipped("mkfs.{vfat|ext4} not installed");
return;
}
}
ASSERT_OK(sd_id128_randomize(&id));
ASSERT_OK(make_filesystem(dissected->partitions[PARTITION_ESP].node, "vfat", "EFI", NULL, id, MKFS_DISCARD, 0, NULL, NULL, NULL));
ASSERT_OK(sd_id128_randomize(&id));
ASSERT_OK(make_filesystem(dissected->partitions[PARTITION_XBOOTLDR].node, "vfat", "xbootldr", NULL, id, MKFS_DISCARD, 0, NULL, NULL, NULL));
ASSERT_OK(sd_id128_randomize(&id));
ASSERT_OK(make_filesystem(dissected->partitions[PARTITION_ROOT].node, "ext4", "root", NULL, id, MKFS_DISCARD, 0, NULL, NULL, NULL));
ASSERT_OK(sd_id128_randomize(&id));
ASSERT_OK(make_filesystem(dissected->partitions[PARTITION_HOME].node, "ext4", "home", NULL, id, MKFS_DISCARD, 0, NULL, NULL, NULL));
dissected = dissected_image_unref(dissected);
/* We created the file systems now via the per-partition block devices. But the dissection code might
* probe them via the whole block device. These block devices have separate buffer caches though,
* hence what was written via the partition device might not appear on the whole block device
* yet. Let's hence explicitly flush the whole block device, so that the read-back definitely
* works. */
ASSERT_OK_ERRNO(ioctl(loop->fd, BLKFLSBUF, 0));
/* Try to read once, without pinning or adding partitions, i.e. by only accessing the whole block
* device. */
ASSERT_OK(dissect_loop_device(
loop,
/* verity= */ NULL,
/* mount_options= */ NULL,
/* image_policy= */ NULL,
/* image_filter= */ NULL,
/* flags= */ 0,
&dissected));
verify_dissected_image_harder(dissected);
dissected = dissected_image_unref(dissected);
/* Now go via the loopback device after all, but this time add/pin, because now we want to mount it. */
ASSERT_OK(dissect_loop_device(
loop,
/* verity= */ NULL,
/* mount_options= */ NULL,
/* image_policy= */ NULL,
/* image_filter= */ NULL,
DISSECT_IMAGE_ADD_PARTITION_DEVICES|DISSECT_IMAGE_PIN_PARTITION_DEVICES,
&dissected));
verify_dissected_image_harder(dissected);
ASSERT_OK(mkdtemp_malloc(NULL, &mounted));
/* We are particularly correct here, and now downgrade LOCK → LOCK_SH. That's because we are done
* with formatting the file systems, so we don't need the exclusive lock anymore. From now on a
* shared one is fine. This way udev can now probe the device if it wants, but still won't call
* BLKRRPART on it, and that's good, because that would destroy our partition table while we are at
* it. */
ASSERT_OK(loop_device_flock(loop, LOCK_SH));
/* 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. */
ASSERT_OK(detach_mount_namespace());
/* This first (writable) mount will initialize the mount point dirs, so that the subsequent read-only ones can work */
ASSERT_OK(dissected_image_mount(
dissected,
mounted,
/* uid_shift= */ UID_INVALID,
/* uid_range= */ UID_INVALID,
/* userns_fd= */ -EBADF,
0));
/* Now we mounted everything, the partitions are pinned. Now it's fine to release the lock
* fully. This means udev could now issue BLKRRPART again, but that's OK given this will fail because
* we now mounted the device. */
ASSERT_OK(loop_device_flock(loop, LOCK_UN));
ASSERT_OK(umount_recursive(mounted, 0));
loop = loop_device_unref(loop);
log_notice("Threads are being started now");
/* zero timeout means pick default: let's make sure we run for 10s on slow systems at max */
if (arg_timeout == 0)
arg_timeout = slow_tests_enabled() ? 5 * USEC_PER_SEC : 1 * USEC_PER_SEC;
end = usec_add(now(CLOCK_MONOTONIC), arg_timeout);
if (arg_n_threads > 1)
for (unsigned i = 0; i < arg_n_threads; i++)
ASSERT_EQ(pthread_create(threads + i, NULL, thread_func, FD_TO_PTR(fd)), 0);
log_notice("All threads started now.");
if (arg_n_threads == 1)
ASSERT_NULL(thread_func(FD_TO_PTR(fd)));
else
for (unsigned i = 0; i < arg_n_threads; i++) {
log_notice("Joining thread #%u.", i);
void *k;
ASSERT_EQ(pthread_join(threads[i], &k), 0);
ASSERT_NULL(k);
log_notice("Joined thread #%u.", i);
}
log_notice("Threads are all terminated now.");
#else
log_notice("Cutting test short, since we do not have libblkid.");
#endif
}
static int make_test_image(int *ret_fd) {
_cleanup_free_ char *p = NULL, *cmd = NULL;
_cleanup_pclose_ FILE *sfdisk = NULL;
ASSERT_OK(tempfn_random_child("/var/tmp", "sfdisk", &p));
int fd = ASSERT_OK_ERRNO(open(p, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOFOLLOW, 0666));
ASSERT_OK_ERRNO(ftruncate(fd, 256*1024*1024));
cmd = ASSERT_NOT_NULL(strjoin("sfdisk ", p));
sfdisk = ASSERT_NOT_NULL(popen(cmd, "we"));
fputs("label: gpt\n"
"size=32M, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B\n", sfdisk);
ASSERT_EQ(pclose(sfdisk), 0);
sfdisk = NULL;
(void) unlink(p);
*ret_fd = fd;
return 0;
}
TEST(sector_size_regular_file) {
_cleanup_(loop_device_unrefp) LoopDevice *loop = NULL;
_cleanup_close_ int fd = -EBADF;
if (have_effective_cap(CAP_SYS_ADMIN) <= 0) {
log_tests_skipped("not running privileged");
return;
}
if (detect_container() != 0 || running_in_chroot() != 0) {
log_tests_skipped("Test not supported in a container/chroot");
return;
}
ASSERT_OK(make_test_image(&fd));
/* sector_size=0 on regular file: should default to 512 */
ASSERT_OK(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 0, 0, LOCK_EX, &loop));
ASSERT_EQ(loop->sector_size, 512u);
loop = loop_device_unref(loop);
/* sector_size=UINT32_MAX on regular file with GPT: should probe and find 512 */
ASSERT_OK(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, UINT32_MAX, 0, LOCK_EX, &loop));
ASSERT_EQ(loop->sector_size, 512u);
loop = loop_device_unref(loop);
/* Explicit sector_size=512 on regular file */
ASSERT_OK(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 512, 0, LOCK_EX, &loop));
ASSERT_EQ(loop->sector_size, 512u);
loop = loop_device_unref(loop);
/* Explicit sector_size=4096 on regular file */
ASSERT_OK(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 4096, 0, LOCK_EX, &loop));
ASSERT_EQ(loop->sector_size, 4096u);
loop = loop_device_unref(loop);
}
TEST(sector_size_block_device) {
_cleanup_(loop_device_unrefp) LoopDevice *block_loop = NULL, *loop = NULL;
_cleanup_close_ int fd = -EBADF;
if (have_effective_cap(CAP_SYS_ADMIN) <= 0) {
log_tests_skipped("not running privileged");
return;
}
if (detect_container() != 0 || running_in_chroot() != 0) {
log_tests_skipped("Test not supported in a container/chroot, requires udev/uevent notifications");
return;
}
ASSERT_OK(make_test_image(&fd));
/* Create a loop device to use as our block device */
ASSERT_OK(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 0, LO_FLAGS_PARTSCAN, LOCK_EX, &block_loop));
ASSERT_FALSE(LOOP_DEVICE_IS_FOREIGN(block_loop));
ASSERT_OK(loop_device_flock(block_loop, LOCK_SH));
uint32_t device_ssz = block_loop->sector_size;
/* sector_size=0 on block device: should use device directly */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, 0, 0, LOCK_SH, &loop));
ASSERT_FALSE(loop->created);
ASSERT_EQ(loop->sector_size, device_ssz);
loop = loop_device_unref(loop);
/* sector_size=UINT32_MAX on block device: should probe, match device, use directly */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, UINT32_MAX, 0, LOCK_SH, &loop));
ASSERT_FALSE(loop->created);
ASSERT_EQ(loop->sector_size, device_ssz);
loop = loop_device_unref(loop);
/* sector_size=UINT32_MAX with LO_FLAGS_PARTSCAN: should probe, match, use directly */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, UINT32_MAX, LO_FLAGS_PARTSCAN, LOCK_SH, &loop));
ASSERT_FALSE(loop->created);
ASSERT_EQ(loop->sector_size, device_ssz);
loop = loop_device_unref(loop);
/* Explicit sector_size matching device: should use device directly */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, device_ssz, 0, LOCK_SH, &loop));
ASSERT_FALSE(loop->created);
ASSERT_EQ(loop->sector_size, device_ssz);
loop = loop_device_unref(loop);
/* Explicit sector_size=4096 (differs from device 512): should create a real loop device */
if (device_ssz != 4096) {
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, 4096, 0, LOCK_SH, &loop));
ASSERT_TRUE(loop->created);
ASSERT_EQ(loop->sector_size, 4096u);
loop = loop_device_unref(loop);
}
}
TEST(sector_size_mismatch) {
_cleanup_(loop_device_unrefp) LoopDevice *block_loop = NULL, *loop = NULL;
_cleanup_close_ int fd = -EBADF;
if (have_effective_cap(CAP_SYS_ADMIN) <= 0) {
log_tests_skipped("not running privileged");
return;
}
if (detect_container() != 0 || running_in_chroot() != 0) {
log_tests_skipped("Test not supported in a container/chroot");
return;
}
/* Create an image with a GPT written at 512-byte sectors, then create a loop device with
* 4096-byte sectors on top. This simulates the CD-ROM scenario where the device has large
* blocks but the GPT uses 512-byte sectors. */
ASSERT_OK(make_test_image(&fd));
/* Create a loop device with 4096-byte sector size — GPT was written at 512 */
ASSERT_OK(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 4096, 0, LOCK_EX, &block_loop));
ASSERT_TRUE(block_loop->created);
ASSERT_EQ(block_loop->sector_size, 4096u);
ASSERT_OK(loop_device_flock(block_loop, LOCK_SH));
/* sector_size=0: no preference, should use block device directly despite GPT mismatch */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, 0, 0, LOCK_SH, &loop));
ASSERT_FALSE(loop->created);
ASSERT_EQ(loop->sector_size, 4096u);
loop = loop_device_unref(loop);
/* sector_size=UINT32_MAX: should probe GPT at 512, detect mismatch with device 4096,
* and create a new loop device with 512-byte sectors */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, UINT32_MAX, 0, LOCK_SH, &loop));
ASSERT_TRUE(loop->created);
ASSERT_EQ(loop->sector_size, 512u);
loop = loop_device_unref(loop);
/* Explicit sector_size=512: differs from device 4096, should create a new loop device */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, 512, 0, LOCK_SH, &loop));
ASSERT_TRUE(loop->created);
ASSERT_EQ(loop->sector_size, 512u);
loop = loop_device_unref(loop);
/* Explicit sector_size=4096: matches device, should use directly */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, 4096, 0, LOCK_SH, &loop));
ASSERT_FALSE(loop->created);
ASSERT_EQ(loop->sector_size, 4096u);
loop = loop_device_unref(loop);
}
TEST(partscan_required) {
_cleanup_(loop_device_unrefp) LoopDevice *block_loop = NULL, *loop = NULL;
_cleanup_close_ int fd = -EBADF;
if (have_effective_cap(CAP_SYS_ADMIN) <= 0) {
log_tests_skipped("not running privileged");
return;
}
if (detect_container() != 0 || running_in_chroot() != 0) {
log_tests_skipped("Test not supported in a container/chroot, requires udev/uevent notifications");
return;
}
ASSERT_OK(make_test_image(&fd));
/* Set up a backing loop device without LO_FLAGS_PARTSCAN. */
ASSERT_OK(loop_device_make(fd, O_RDWR, 0, UINT64_MAX, 0, 0, LOCK_EX, &block_loop));
ASSERT_TRUE(block_loop->created);
ASSERT_OK(loop_device_flock(block_loop, LOCK_SH));
/* Without LO_FLAGS_PARTSCAN: shortcut should be taken (reuse existing loop). */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, 0, 0, LOCK_SH, &loop));
ASSERT_FALSE(loop->created);
loop = loop_device_unref(loop);
/* With LO_FLAGS_PARTSCAN: backing loop has partscan disabled, so a new loop device with
* partscan must be created. */
ASSERT_OK(loop_device_make(block_loop->fd, O_RDWR, 0, UINT64_MAX, 0, LO_FLAGS_PARTSCAN, LOCK_SH, &loop));
ASSERT_TRUE(loop->created);
loop = loop_device_unref(loop);
}
DEFINE_TEST_MAIN_WITH_INTRO(LOG_DEBUG, intro);
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