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 struct inode_fs_paths {
  27         struct btrfs_path               *btrfs_path;
  28         struct btrfs_root               *fs_root;
  29         struct btrfs_data_container     *fspath;
  30 };
  31
  32 typedef int (iterate_extent_inodes_t)(u64 inum, u64 offset, u64 root,
  33                 void *ctx);
  34
  35 int extent_from_logical(struct btrfs_fs_info *fs_info, u64 logical,
  36                         struct btrfs_path *path, struct btrfs_key *found_key,
  37                         u64 *flags);
  38
  39 int tree_backref_for_extent(unsigned long *ptr, struct extent_buffer *eb,
  40                             struct btrfs_key *key, struct btrfs_extent_item *ei,
  41                             u32 item_size, u64 *out_root, u8 *out_level);
  42
  43 int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
  44                                 u64 extent_item_objectid,
  45                                 u64 extent_offset, int search_commit_root,
  46                                 iterate_extent_inodes_t *iterate, void *ctx);
  47
  48 int iterate_inodes_from_logical(u64 logical, struct btrfs_fs_info *fs_info,
  49                                 struct btrfs_path *path,
  50                                 iterate_extent_inodes_t *iterate, void *ctx);
  51
  52 int paths_from_inode(u64 inum, struct inode_fs_paths *ipath);
  53
  54 int btrfs_find_all_roots(struct btrfs_trans_handle *trans,
  55                          struct btrfs_fs_info *fs_info, u64 bytenr,
  56                          u64 time_seq, struct ulist **roots);
  57 char *btrfs_ref_to_path(struct btrfs_root *fs_root, struct btrfs_path *path,
  58                         u32 name_len, unsigned long name_off,
  59                         struct extent_buffer *eb_in, u64 parent,
  60                         char *dest, u32 size);
  61
  62 struct btrfs_data_container *init_data_container(u32 total_bytes);
  63 struct inode_fs_paths *init_ipath(s32 total_bytes, struct btrfs_root *fs_root,
  64                                         struct btrfs_path *path);
  65 void free_ipath(struct inode_fs_paths *ipath);
  66
  67 int btrfs_find_one_extref(struct btrfs_root *root, u64 inode_objectid,
  68                           u64 start_off, struct btrfs_path *path,
  69                           struct btrfs_inode_extref **ret_extref,
  70                           u64 *found_off);
  71 int btrfs_check_shared(struct btrfs_root *root, u64 inum, u64 bytenr);
  72
  73 int __init btrfs_prelim_ref_init(void);
  74 void btrfs_prelim_ref_exit(void);
  75
  76 struct prelim_ref {
  77         struct rb_node rbnode;
  78         u64 root_id;
  79         struct btrfs_key key_for_search;
  80         int level;
  81         int count;
  82         struct extent_inode_elem *inode_list;
  83         u64 parent;
  84         u64 wanted_disk_byte;
  85 };
  86
  87 #endif