fs/btrfs/transaction.h

   1 /*
   2  * Copyright (C) 2007 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 __BTRFS_TRANSACTION__
  20 #define __BTRFS_TRANSACTION__
  21 #include "btrfs_inode.h"
  22 #include "delayed-ref.h"
  23
  24 struct btrfs_transaction {
  25         u64 transid;
  26         /*
  27          * total writers in this transaction, it must be zero before the
  28          * transaction can end
  29          */
  30         unsigned long num_writers;
  31
  32         unsigned long num_joined;
  33         int in_commit;
  34         int use_count;
  35         int commit_done;
  36         int blocked;
  37         struct list_head list;
  38         struct extent_io_tree dirty_pages;
  39         unsigned long start_time;
  40         wait_queue_head_t writer_wait;
  41         wait_queue_head_t commit_wait;
  42         struct list_head pending_snapshots;
  43         struct btrfs_delayed_ref_root delayed_refs;
  44 };
  45
  46 struct btrfs_trans_handle {
  47         u64 transid;
  48         unsigned long blocks_reserved;
  49         unsigned long blocks_used;
  50         struct btrfs_transaction *transaction;
  51         u64 block_group;
  52         u64 alloc_exclude_start;
  53         u64 alloc_exclude_nr;
  54         unsigned long delayed_ref_updates;
  55 };
  56
  57 struct btrfs_pending_snapshot {
  58         struct dentry *dentry;
  59         struct btrfs_root *root;
  60         char *name;
  61         struct btrfs_key root_key;
  62         struct list_head list;
  63 };
  64
  65 static inline void btrfs_set_trans_block_group(struct btrfs_trans_handle *trans,
  66                                                struct inode *inode)
  67 {
  68         trans->block_group = BTRFS_I(inode)->block_group;
  69 }
  70
  71 static inline void btrfs_update_inode_block_group(
  72                                           struct btrfs_trans_handle *trans,
  73                                           struct inode *inode)
  74 {
  75         BTRFS_I(inode)->block_group = trans->block_group;
  76 }
  77
  78 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
  79                                               struct inode *inode)
  80 {
  81         BTRFS_I(inode)->last_trans = trans->transaction->transid;
  82         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
  83 }
  84
  85 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
  86                           struct btrfs_root *root);
  87 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
  88                                                    int num_blocks);
  89 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
  90                                                    int num_blocks);
  91 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
  92                                                    int num_blocks);
  93 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
  94                                      struct btrfs_root *root);
  95 int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
  96                             struct btrfs_root *root);
  97
  98 int btrfs_add_dead_root(struct btrfs_root *root);
  99 int btrfs_drop_dead_root(struct btrfs_root *root);
 100 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
 101 int btrfs_clean_old_snapshots(struct btrfs_root *root);
 102 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 103                              struct btrfs_root *root);
 104 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 105                                    struct btrfs_root *root);
 106 void btrfs_throttle(struct btrfs_root *root);
 107 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 108                                 struct btrfs_root *root);
 109 int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
 110                                         struct extent_io_tree *dirty_pages);
 111 int btrfs_write_marked_extents(struct btrfs_root *root,
 112                                         struct extent_io_tree *dirty_pages);
 113 int btrfs_wait_marked_extents(struct btrfs_root *root,
 114                                         struct extent_io_tree *dirty_pages);
 115 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 116 #endif