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
  28 struct btrfs_log_ctx {
  29         int log_ret;
  30         int log_transid;
  31         int io_err;
  32         bool log_new_dentries;
  33         struct list_head list;
  34 };
  35
  36 static inline void btrfs_init_log_ctx(struct btrfs_log_ctx *ctx)
  37 {
  38         ctx->log_ret = 0;
  39         ctx->log_transid = 0;
  40         ctx->io_err = 0;
  41         ctx->log_new_dentries = false;
  42         INIT_LIST_HEAD(&ctx->list);
  43 }
  44
  45 static inline void btrfs_set_log_full_commit(struct btrfs_fs_info *fs_info,
  46                                              struct btrfs_trans_handle *trans)
  47 {
  48         ACCESS_ONCE(fs_info->last_trans_log_full_commit) = trans->transid;
  49 }
  50
  51 static inline int btrfs_need_log_full_commit(struct btrfs_fs_info *fs_info,
  52                                              struct btrfs_trans_handle *trans)
  53 {
  54         return ACCESS_ONCE(fs_info->last_trans_log_full_commit) ==
  55                 trans->transid;
  56 }
  57
  58 int btrfs_sync_log(struct btrfs_trans_handle *trans,
  59                    struct btrfs_root *root, struct btrfs_log_ctx *ctx);
  60 int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root);
  61 int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
  62                              struct btrfs_fs_info *fs_info);
  63 int btrfs_recover_log_trees(struct btrfs_root *tree_root);
  64 int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans,
  65                           struct btrfs_root *root, struct dentry *dentry,
  66                           const loff_t start,
  67                           const loff_t end,
  68                           struct btrfs_log_ctx *ctx);
  69 int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans,
  70                                  struct btrfs_root *root,
  71                                  const char *name, int name_len,
  72                                  struct inode *dir, u64 index);
  73 int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans,
  74                                struct btrfs_root *root,
  75                                const char *name, int name_len,
  76                                struct inode *inode, u64 dirid);
  77 void btrfs_end_log_trans(struct btrfs_root *root);
  78 int btrfs_pin_log_trans(struct btrfs_root *root);
  79 void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
  80                              struct inode *dir, struct inode *inode,
  81                              int for_rename);
  82 void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans,
  83                                    struct inode *dir);
  84 int btrfs_log_new_name(struct btrfs_trans_handle *trans,
  85                         struct inode *inode, struct inode *old_dir,
  86                         struct dentry *parent);
  87 #endif