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