linux/fs/btrfs/backref.h
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   1/*
   2 * Copyright (C) 2011 STRATO.  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
  19#ifndef __BTRFS_BACKREF__
  20#define __BTRFS_BACKREF__
  21
  22#include "ioctl.h"
  23#include "ulist.h"
  24#include "extent_io.h"
  25
  26#define BTRFS_BACKREF_SEARCH_COMMIT_ROOT ((struct btrfs_trans_handle *)0)
  27
  28struct inode_fs_paths {
  29        struct btrfs_path               *btrfs_path;
  30        struct btrfs_root               *fs_root;
  31        struct btrfs_data_container     *fspath;
  32};
  33
  34typedef int (iterate_extent_inodes_t)(u64 inum, u64 offset, u64 root,
  35                void *ctx);
  36
  37int inode_item_info(u64 inum, u64 ioff, struct btrfs_root *fs_root,
  38                        struct btrfs_path *path);
  39
  40int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
  41                        struct btrfs_path *path, struct btrfs_key *found_key,
  42                        u64 *flags);
  43
  44int tree_backref_for_extent(unsigned long *ptr, struct extent_buffer *eb,
  45                                struct btrfs_extent_item *ei, u32 item_size,
  46                                u64 *out_root, u8 *out_level);
  47
  48int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
  49                                u64 extent_item_objectid,
  50                                u64 extent_offset, int search_commit_root,
  51                                iterate_extent_inodes_t *iterate, void *ctx);
  52
  53int iterate_inodes_from_logical(u64 logical, struct btrfs_fs_info *fs_info,
  54                                struct btrfs_path *path,
  55                                iterate_extent_inodes_t *iterate, void *ctx);
  56
  57int paths_from_inode(u64 inum, struct inode_fs_paths *ipath);
  58
  59int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
  60                                struct btrfs_fs_info *fs_info, u64 bytenr,
  61                                u64 time_seq, struct ulist **roots);
  62char *btrfs_iref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
  63                         struct btrfs_inode_ref *iref, struct extent_buffer *eb,
  64                         u64 parent, char *dest, u32 size);
  65char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
  66                        u32 name_len, unsigned long name_off,
  67                        struct extent_buffer *eb_in, u64 parent,
  68                        char *dest, u32 size);
  69
  70struct btrfs_data_container *init_data_container(u32 total_bytes);
  71struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root,
  72                                        struct btrfs_path *path);
  73void free_ipath(struct inode_fs_paths *ipath);
  74
  75int btrfs_find_one_extref(struct btrfs_root *root, u64 inode_objectid,
  76                          u64 start_off, struct btrfs_path *path,
  77                          struct btrfs_inode_extref **ret_extref,
  78                          u64 *found_off);
  79
  80#endif
  81
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