1 files changed, 47 insertions, 0 deletions
diff --git a/src/shared/loop-util.h b/src/shared/loop-util.h
new file mode 100644
index 0000000..e466a5a
--- /dev/null
+++ b/src/shared/loop-util.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include "sd-device.h"
+
+#include "macro.h"
+#include "time-util.h"
+
+typedef struct LoopDevice LoopDevice;
+
+/* Some helpers for setting up loopback block devices */
+
+struct LoopDevice {
+        unsigned n_ref;
+        int fd;
+        int lock_fd;
+        int nr;   /* The loopback device index (i.e. 4 for /dev/loop4); if this object encapsulates a non-loopback block device, set to -1 */
+        dev_t devno;
+        char *node;
+        sd_device *dev;
+        char *backing_file;
+        bool relinquished;
+        uint64_t diskseq; /* Block device sequence number, monothonically incremented by the kernel on create/attach, or 0 if we don't know */
+        uint64_t uevent_seqnum_not_before; /* uevent sequm right before we attached the loopback device, or UINT64_MAX if we don't know */
+        usec_t timestamp_not_before; /* CLOCK_MONOTONIC timestamp taken immediately before attaching the loopback device, or USEC_INFINITY if we don't know */
+};
+
+/* Returns true if LoopDevice object is not actually a loopback device but some other block device we just wrap */
+#define LOOP_DEVICE_IS_FOREIGN(d) ((d)->nr < 0)
+
+int loop_device_make(int fd, int open_flags, uint64_t offset, uint64_t size, uint32_t block_size, uint32_t loop_flags, int lock_op, LoopDevice **ret);
+int loop_device_make_by_path(const char *path, int open_flags, uint32_t loop_flags, int lock_op, LoopDevice **ret);
+int loop_device_open(sd_device *dev, int open_flags, int lock_op, LoopDevice **ret);
+int loop_device_open_from_fd(int fd, int open_flags, int lock_op, LoopDevice **ret);
+int loop_device_open_from_path(const char *path, int open_flags, int lock_op, LoopDevice **ret);
+
+LoopDevice* loop_device_ref(LoopDevice *d);
+LoopDevice* loop_device_unref(LoopDevice *d);
+DEFINE_TRIVIAL_CLEANUP_FUNC(LoopDevice*, loop_device_unref);
+
+void loop_device_relinquish(LoopDevice *d);
+void loop_device_unrelinquish(LoopDevice *d);
+
+int loop_device_refresh_size(LoopDevice *d, uint64_t offset, uint64_t size);
+
+int loop_device_flock(LoopDevice *d, int operation);
+int loop_device_sync(LoopDevice *d);