dissect-image: introduce dissect_loop_device() which takes LoopDevice object

src/shared/discover-image.c

@@ -1196,12 +1196,9 @@ int image_read_metadata(Image *i) {
                 if (r < 0)
                         return r;
 
-                r = dissect_image(
-                                d->fd,
+                r = dissect_loop_device(
+                                d,
                                 NULL, NULL,
-                                d->diskseq,
-                                d->uevent_seqnum_not_before,
-                                d->timestamp_not_before,
                                 DISSECT_IMAGE_GENERIC_ROOT |
                                 DISSECT_IMAGE_REQUIRE_ROOT |
                                 DISSECT_IMAGE_RELAX_VAR_CHECK |

src/shared/dissect-image.c

@@ -2796,29 +2796,23 @@ finish:
         return r;
 }
 
-int dissect_image_and_warn(
-                int fd,
+int dissect_loop_device_and_warn(
                 const char *name,
+                const LoopDevice *loop,
                 const VeritySettings *verity,
                 const MountOptions *mount_options,
-                uint64_t diskseq,
-                uint64_t uevent_seqnum_not_before,
-                usec_t timestamp_not_before,
                 DissectImageFlags flags,
                 DissectedImage **ret) {
 
-        _cleanup_free_ char *buffer = NULL;
         int r;
 
-        if (!name) {
-                r = fd_get_path(fd, &buffer);
-                if (r < 0)
-                        return r;
+        assert(loop);
+        assert(loop->fd >= 0);
 
-                name = buffer;
-        }
+        if (!name)
+                name = ASSERT_PTR(loop->node);
 
-        r = dissect_image(fd, verity, mount_options, diskseq, uevent_seqnum_not_before, timestamp_not_before, flags, ret);
+        r = dissect_loop_device(loop, verity, mount_options, flags, ret);
         switch (r) {
 
         case -EOPNOTSUPP:
@@ -2971,7 +2965,7 @@ int mount_image_privately_interactively(
         if (r < 0)
                 return log_error_errno(r, "Failed to set up loopback device for %s: %m", image);
 
-        r = dissect_image_and_warn(d->fd, image, &verity, NULL, d->diskseq, d->uevent_seqnum_not_before, d->timestamp_not_before, flags, &dissected_image);
+        r = dissect_loop_device_and_warn(image, d, &verity, NULL, flags, &dissected_image);
         if (r < 0)
                 return r;
 
@@ -3082,24 +3076,18 @@ int verity_dissect_and_mount(
         if (r < 0)
                 return log_debug_errno(r, "Failed to create loop device for image: %m");
 
-        r = dissect_image(
-                        loop_device->fd,
+        r = dissect_loop_device(
+                        loop_device,
                         &verity,
                         options,
-                        loop_device->diskseq,
-                        loop_device->uevent_seqnum_not_before,
-                        loop_device->timestamp_not_before,
                         dissect_image_flags,
                         &dissected_image);
         /* No partition table? Might be a single-filesystem image, try again */
         if (!verity.data_path && r == -ENOPKG)
-                 r = dissect_image(
-                                loop_device->fd,
+                 r = dissect_loop_device(
+                                loop_device,
                                 &verity,
                                 options,
-                                loop_device->diskseq,
-                                loop_device->uevent_seqnum_not_before,
-                                loop_device->timestamp_not_before,
                                 dissect_image_flags | DISSECT_IMAGE_NO_PARTITION_TABLE,
                                 &dissected_image);
         if (r < 0)

src/shared/dissect-image.h

@@ -254,7 +254,11 @@ const char* mount_options_from_designator(const MountOptions *options, Partition
 
 int probe_filesystem(const char *node, char **ret_fstype);
 int dissect_image(int fd, const VeritySettings *verity, const MountOptions *mount_options, uint64_t diskseq, uint64_t uevent_seqnum_not_before, usec_t timestamp_not_before, DissectImageFlags flags, DissectedImage **ret);
-int dissect_image_and_warn(int fd, const char *name, const VeritySettings *verity, const MountOptions *mount_options, uint64_t diskseq, uint64_t uevent_seqnum_not_before, usec_t timestamp_not_before, DissectImageFlags flags, DissectedImage **ret);
+static inline int dissect_loop_device(const LoopDevice *loop, const VeritySettings *verity, const MountOptions *mount_options, DissectImageFlags flags, DissectedImage **ret) {
+        assert(loop);
+        return dissect_image(loop->fd, verity, mount_options, loop->diskseq, loop->uevent_seqnum_not_before, loop->timestamp_not_before, flags, ret);
+}
+int dissect_loop_device_and_warn(const char *name, const LoopDevice *loop, const VeritySettings *verity, const MountOptions *mount_options, DissectImageFlags flags, DissectedImage **ret);
 
 DissectedImage* dissected_image_unref(DissectedImage *m);
 DEFINE_TRIVIAL_CLEANUP_FUNC(DissectedImage*, dissected_image_unref);