src/lxc/storage/overlay.h

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #ifndef __LXC_OVERLAY_H
   4 #define __LXC_OVERLAY_H
   5
   6 #include <grp.h>
   7 #include <stdio.h>
   8 #include <stdbool.h>
   9 #include <stdint.h>
  10 #include <unistd.h>
  11 #include <sys/types.h>
  12
  13 #include "storage.h"
  14
  15 struct lxc_storage;
  16
  17 struct bdev_specs;
  18
  19 struct lxc_conf;
  20
  21 struct lxc_rootfs;
  22
  23 extern int ovl_clonepaths(struct lxc_storage *orig, struct lxc_storage *new,
  24                           const char *oldname, const char *cname,
  25                           const char *oldpath, const char *lxcpath, int snap,
  26                           uint64_t newsize, struct lxc_conf *conf);
  27 extern int ovl_create(struct lxc_storage *bdev, const char *dest, const char *n,
  28                       struct bdev_specs *specs);
  29 extern int ovl_destroy(struct lxc_storage *orig);
  30 extern bool ovl_detect(const char *path);
  31 extern int ovl_mount(struct lxc_storage *bdev);
  32 extern int ovl_umount(struct lxc_storage *bdev);
  33
  34 /* To be called from lxcapi_clone() in lxccontainer.c: When we clone a container
  35  * with overlay lxc.mount.entry entries we need to update absolute paths for
  36  * upper- and workdir. This update is done in two locations:
  37  * lxc_conf->unexpanded_config and lxc_conf->mount_list. Both updates are done
  38  * independent of each other since lxc_conf->mountlist may container more mount
  39  * entries (e.g. from other included files) than lxc_conf->unexpanded_config .
  40  */
  41 extern int ovl_update_abs_paths(struct lxc_conf *lxc_conf, const char *lxc_path,
  42                                 const char *lxc_name, const char *newpath,
  43                                 const char *newname);
  44
  45 /* To be called from functions in lxccontainer.c: Get lower directory for
  46  * overlay rootfs.
  47  */
  48 extern const char *ovl_get_lower(const char *rootfs_path);
  49
  50 /* Get rootfs path for overlay backed containers. Allocated memory must be freed
  51  * by caller.
  52  */
  53 extern char *ovl_get_rootfs(const char *rootfs_path, size_t *rootfslen);
  54
  55 /* Create upper- and workdirs for overlay mounts.
  56  */
  57 extern int ovl_mkdir(const struct mntent *mntent,
  58                      const struct lxc_rootfs *rootfs, const char *lxc_name,
  59                      const char *lxc_path);
  60
  61 #endif /* __LXC_OVERLAY_H */