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/*
* Copyright (C) 2012 Alexander Block. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#ifndef __BTRFS_SEND_UTILS_H__
#define __BTRFS_SEND_UTILS_H__
#if BTRFS_FLAT_INCLUDES
#include "kerncompat.h"
#include "ctree.h"
#include "rbtree.h"
#else
#include <btrfs/kerncompat.h>
#include <btrfs/ctree.h>
#include <btrfs/rbtree.h>
#endif /* BTRFS_FLAT_INCLUDES */
#ifdef __cplusplus
extern "C" {
#endif
/*
* Compatibility code for kernels < 3.12; the UUID tree is not available there
* and we have to do the slow search. This should be deprecated someday.
*/
#define BTRFS_COMPAT_SEND_NO_UUID_TREE 1
enum subvol_search_type {
subvol_search_by_root_id,
subvol_search_by_uuid,
subvol_search_by_received_uuid,
subvol_search_by_path,
};
struct subvol_info {
#ifdef BTRFS_COMPAT_SEND_NO_UUID_TREE
struct rb_node rb_root_id_node;
struct rb_node rb_local_node;
struct rb_node rb_received_node;
struct rb_node rb_path_node;
#endif
u64 root_id;
u8 uuid[BTRFS_UUID_SIZE];
u8 parent_uuid[BTRFS_UUID_SIZE];
u8 received_uuid[BTRFS_UUID_SIZE];
u64 ctransid;
u64 otransid;
u64 stransid;
u64 rtransid;
char *path;
};
struct subvol_uuid_search {
int mnt_fd;
#ifdef BTRFS_COMPAT_SEND_NO_UUID_TREE
int uuid_tree_existed;
struct rb_root root_id_subvols;
struct rb_root local_subvols;
struct rb_root received_subvols;
struct rb_root path_subvols;
#endif
};
int subvol_uuid_search_init(int mnt_fd, struct subvol_uuid_search *s);
void subvol_uuid_search_finit(struct subvol_uuid_search *s);
/*
* Search for a subvolume by given type (received uuid, root id, path), returns
* pointer to newly allocated struct subvol_info or NULL in case it's not found
* or there was another error. This ambiguity of error value is fixed by
* subvol_uuid_search2 that returns a negative errno in case of an error, of a
* valid pointer otherwise.
*
* This function will be deprecated in the future, please consider using v2 in
* new code unless you need to keep backward compatibility with older
* btrfs-progs.
*/
struct subvol_info *subvol_uuid_search(struct subvol_uuid_search *s,
u64 root_id, const u8 *uuid, u64 transid,
const char *path,
enum subvol_search_type type);
struct subvol_info *subvol_uuid_search2(struct subvol_uuid_search *s,
u64 root_id, const u8 *uuid, u64 transid,
const char *path,
enum subvol_search_type type);
void subvol_uuid_search_add(struct subvol_uuid_search *s,
struct subvol_info *si);
int btrfs_subvolid_resolve(int fd, char *path, size_t path_len, u64 subvol_id);
/*
* DEPRECATED: the functions path_cat and path_cat3 are unsafe and should not
* be used, use the _out variants and always check the return code.
*/
__attribute__((deprecated))
char *path_cat(const char *p1, const char *p2);
__attribute__((deprecated))
char *path_cat3(const char *p1, const char *p2, const char *p3);
int path_cat_out(char *out, const char *p1, const char *p2);
int path_cat3_out(char *out, const char *p1, const char *p2, const char *p3);
#ifdef __cplusplus
}
#endif
#endif
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