LXR linux/fs/btrfs/tree-log.h

   1/*
   2 * Copyright (C) 2008 Oracle.  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 __TREE_LOG_
  20#define __TREE_LOG_
  21
  22#include "ctree.h"
  23#include "transaction.h"
  24
  25/* return value for btrfs_log_dentry_safe that means we don't need to log it at all */
  26#define BTRFS_NO_LOG_SYNC 256
  27
  28struct btrfs_log_ctx {
  29        int log_ret;
  30        int log_transid;
  31        int io_err;
  32        bool log_new_dentries;
  33        struct inode *inode;
  34        struct list_head list;
  35};
  36
  37static inline void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx,
  38                                      struct inode *inode)
  39{
  40        ctx->log_ret = 0;
  41        ctx->log_transid = 0;
  42        ctx->io_err = 0;
  43        ctx->log_new_dentries = false;
  44        ctx->inode = inode;
  45        INIT_LIST_HEAD(&ctx->list);
  46}
  47
  48static inline void btrfs_set_log_full_commit(struct btrfs_fs_info *fs_info,
  49                                             struct btrfs_trans_handle *trans)
  50{
  51        ACCESS_ONCE(fs_info->last_trans_log_full_commit) = trans->transid;
  52}
  53
  54static inline int btrfs_need_log_full_commit(struct btrfs_fs_info *fs_info,
  55                                             struct btrfs_trans_handle *trans)
  56{
  57        return ACCESS_ONCE(fs_info->last_trans_log_full_commit) ==
  58                trans->transid;
  59}
  60
  61int btrfs_sync_log(struct btrfs_trans_handle *trans,
  62                   struct btrfs_root *root, struct btrfs_log_ctx *ctx);
  63int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root);
  64int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
  65                             struct btrfs_fs_info *fs_info);
  66int btrfs_recover_log_trees(struct btrfs_root *tree_root);
  67int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
  68                          struct btrfs_root *root, struct dentry *dentry,
  69                          const loff_t start,
  70                          const loff_t end,
  71                          struct btrfs_log_ctx *ctx);
  72int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans,
  73                                 struct btrfs_root *root,
  74                                 const char *name, int name_len,
  75                                 struct inode *dir, u64 index);
  76int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans,
  77                               struct btrfs_root *root,
  78                               const char *name, int name_len,
  79                               struct inode *inode, u64 dirid);
  80void btrfs_end_log_trans(struct btrfs_root *root);
  81int btrfs_pin_log_trans(struct btrfs_root *root);
  82void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
  83                             struct inode *dir, struct inode *inode,
  84                             int for_rename);
  85void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans,
  86                                   struct inode *dir);
  87int btrfs_log_new_name(struct btrfs_trans_handle *trans,
  88                        struct inode *inode, struct inode *old_dir,
  89                        struct dentry *parent);
  90#endif
  91