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 inode *inode;
  34         struct list_head list;
  35 };
  36
  37 static 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
  48 static inline void btrfs_set_log_full_commit(struct btrfs_fs_info *fs_info,
  49                                              struct btrfs_trans_handle *trans)
  50 {
  51         WRITE_ONCE(fs_info->last_trans_log_full_commit, trans->transid);
  52 }
  53
  54 static inline int btrfs_need_log_full_commit(struct btrfs_fs_info *fs_info,
  55                                              struct btrfs_trans_handle *trans)
  56 {
  57         return READ_ONCE(fs_info->last_trans_log_full_commit) ==
  58                 trans->transid;
  59 }
  60
  61 int btrfs_sync_log(struct btrfs_trans_handle *trans,
  62                    struct btrfs_root *root, struct btrfs_log_ctx *ctx);
  63 int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root);
  64 int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
  65                              struct btrfs_fs_info *fs_info);
  66 int btrfs_recover_log_trees(struct btrfs_root *tree_root);
  67 int 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);
  72 int 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 btrfs_inode *dir, u64 index);
  76 int 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 btrfs_inode *inode, u64 dirid);
  80 void btrfs_end_log_trans(struct btrfs_root *root);
  81 int btrfs_pin_log_trans(struct btrfs_root *root);
  82 void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans,
  83                              struct btrfs_inode *dir, struct btrfs_inode *inode,
  84                              int for_rename);
  85 void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans,
  86                                    struct btrfs_inode *dir);
  87 int btrfs_log_new_name(struct btrfs_trans_handle *trans,
  88                         struct btrfs_inode *inode, struct btrfs_inode *old_dir,
  89                         struct dentry *parent);
  90 #endif