send-utils.h

   1 /*
   2  * Copyright (C) 2012 Alexander Block.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18 #ifndef SEND_UTILS_H_
  19 #define SEND_UTILS_H_
  20
  21 #if BTRFS_FLAT_INCLUDES
  22 #include "ctree.h"
  23 #include "rbtree.h"
  24 #else
  25 #include <btrfs/ctree.h>
  26 #include <btrfs/rbtree.h>
  27 #endif /* BTRFS_FLAT_INCLUDES */
  28
  29 #ifdef __cplusplus
  30 extern "C" {
  31 #endif
  32
  33 /*
  34  * Compatibility code for kernels < 3.12; the UUID tree is not available there
  35  * and we have to do the slow search. This should be deprecated someday.
  36  */
  37 #define BTRFS_COMPAT_SEND_NO_UUID_TREE 1
  38
  39 enum subvol_search_type {
  40         subvol_search_by_root_id,
  41         subvol_search_by_uuid,
  42         subvol_search_by_received_uuid,
  43         subvol_search_by_path,
  44 };
  45
  46 struct subvol_info {
  47 #ifdef BTRFS_COMPAT_SEND_NO_UUID_TREE
  48         struct rb_node rb_root_id_node;
  49         struct rb_node rb_local_node;
  50         struct rb_node rb_received_node;
  51         struct rb_node rb_path_node;
  52 #endif
  53
  54         u64 root_id;
  55         u8 uuid[BTRFS_UUID_SIZE];
  56         u8 parent_uuid[BTRFS_UUID_SIZE];
  57         u8 received_uuid[BTRFS_UUID_SIZE];
  58         u64 ctransid;
  59         u64 otransid;
  60         u64 stransid;
  61         u64 rtransid;
  62
  63         char *path;
  64 };
  65
  66 struct subvol_uuid_search {
  67         int mnt_fd;
  68 #ifdef BTRFS_COMPAT_SEND_NO_UUID_TREE
  69         int uuid_tree_existed;
  70
  71         struct rb_root root_id_subvols;
  72         struct rb_root local_subvols;
  73         struct rb_root received_subvols;
  74         struct rb_root path_subvols;
  75 #endif
  76 };
  77
  78 int subvol_uuid_search_init(int mnt_fd, struct subvol_uuid_search *s);
  79 void subvol_uuid_search_finit(struct subvol_uuid_search *s);
  80 struct subvol_info *subvol_uuid_search(struct subvol_uuid_search *s,
  81                                        u64 root_id, const u8 *uuid, u64 transid,
  82                                        const char *path,
  83                                        enum subvol_search_type type);
  84 void subvol_uuid_search_add(struct subvol_uuid_search *s,
  85                             struct subvol_info *si);
  86
  87 int btrfs_subvolid_resolve(int fd, char *path, size_t path_len, u64 subvol_id);
  88
  89 char *path_cat(const char *p1, const char *p2);
  90 char *path_cat3(const char *p1, const char *p2, const char *p3);
  91
  92 #ifdef __cplusplus
  93 }
  94 #endif
  95
  96 #endif /* SEND_UTILS_H_ */