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 <linux/btrfs.h>
  23 #include "ulist.h"
  24 #include "extent_io.h"
  25
  26 #define BTRFS_BACKREF_SEARCH_COMMIT_ROOT ((struct btrfs_trans_handle *)0)
  27
  28 struct inode_fs_paths {
  29         struct btrfs_path               *btrfs_path;
  30         struct btrfs_root               *fs_root;
  31         struct btrfs_data_container     *fspath;
  32 };
  33
  34 typedef int (iterate_extent_inodes_t)(u64 inum, u64 offset, u64 root,
  35                 void *ctx);
  36
  37 int inode_item_info(u64 inum, u64 ioff, struct btrfs_root *fs_root,
  38                         struct btrfs_path *path);
  39
  40 int 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
  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 time_seq, struct ulist **roots);
  62 char *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);
  65 char *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
  70 struct btrfs_data_container *init_data_container(u32 total_bytes);
  71 struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root,
  72                                         struct btrfs_path *path);
  73 void free_ipath(struct inode_fs_paths *ipath);
  74
  75 int 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