src/shared/loop-util.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 #pragma once
   3
   4 #include "macro.h"
   5 #include "time-util.h"
   6
   7 typedef struct LoopDevice LoopDevice;
   8
   9 /* Some helpers for setting up loopback block devices */
  10
  11 struct LoopDevice {
  12         int fd;
  13         int nr;
  14         dev_t devno;
  15         char *node;
  16         bool relinquished;
  17         uint64_t uevent_seqnum_not_before; /* uevent sequm right before we attached the loopback device, or UINT64_MAX if we don't know */
  18         usec_t timestamp_not_before; /* CLOCK_MONOTONIC timestamp taken immediately before attaching the loopback device, or USEC_INFINITY if we don't know */
  19 };
  20
  21 int loop_device_make(int fd, int open_flags, uint64_t offset, uint64_t size, uint32_t loop_flags, LoopDevice **ret);
  22 int loop_device_make_by_path(const char *path, int open_flags, uint32_t loop_flags, LoopDevice **ret);
  23 int loop_device_open(const char *loop_path, int open_flags, LoopDevice **ret);
  24
  25 LoopDevice* loop_device_unref(LoopDevice *d);
  26 DEFINE_TRIVIAL_CLEANUP_FUNC(LoopDevice*, loop_device_unref);
  27
  28 void loop_device_relinquish(LoopDevice *d);
  29
  30 int loop_device_refresh_size(LoopDevice *d, uint64_t offset, uint64_t size);
  31
  32 int loop_device_flock(LoopDevice *d, int operation);
  33 int loop_device_sync(LoopDevice *d);