fs/btrfs/backref.h

   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
  25 #define BTRFS_BACKREF_SEARCH_COMMIT_ROOT ((struct btrfs_trans_handle *)0)
  26
  27 struct inode_fs_paths {
  28         struct btrfs_path               *btrfs_path;
  29         struct btrfs_root               *fs_root;
  30         struct btrfs_data_container     *fspath;
  31 };
  32
  33 typedef int (iterate_extent_inodes_t)(u64 inum, u64 offset, u64 root,
  34                 void *ctx);
  35 typedef int (iterate_irefs_t)(u64 parent, struct btrfs_inode_ref *iref,
  36                                 struct extent_buffer *eb, void *ctx);
  37
  38 int inode_item_info(u64 inum, u64 ioff, struct btrfs_root *fs_root,
  39                         struct btrfs_path *path);
  40
  41 int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
  42                         struct btrfs_path *path, struct btrfs_key *found_key);
  43
  44 int 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
  48 int 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
  53 int 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
  57 int paths_from_inode(u64 inum, struct inode_fs_paths *ipath);
  58
  59 int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
  60                                 struct btrfs_fs_info *fs_info, u64 bytenr,
  61                                 u64 num_bytes, u64 seq, struct ulist **roots);
  62
  63 struct btrfs_data_container *init_data_container(u32 total_bytes);
  64 struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root,
  65                                         struct btrfs_path *path);
  66 void free_ipath(struct inode_fs_paths *ipath);
  67
  68 #endif