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         u64 block_group;
  49         u64 bytes_reserved;
  50         unsigned long blocks_reserved;
  51         unsigned long blocks_used;
  52         unsigned long delayed_ref_updates;
  53         struct btrfs_transaction *transaction;
  54         struct btrfs_block_rsv *block_rsv;
  55 };
  56
  57 struct btrfs_pending_snapshot {
  58         struct dentry *dentry;
  59         struct btrfs_root *root;
  60         struct btrfs_root *snap;
  61         /* block reservation for the operation */
  62         struct btrfs_block_rsv block_rsv;
  63         /* extra metadata reseration for relocation */
  64         int error;
  65         bool readonly;
  66         struct list_head list;
  67 };
  68
  69 static inline void btrfs_set_trans_block_group(struct btrfs_trans_handle *trans,
  70                                                struct inode *inode)
  71 {
  72         trans->block_group = BTRFS_I(inode)->block_group;
  73 }
  74
  75 static inline void btrfs_update_inode_block_group(
  76                                           struct btrfs_trans_handle *trans,
  77                                           struct inode *inode)
  78 {
  79         BTRFS_I(inode)->block_group = trans->block_group;
  80 }
  81
  82 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
  83                                               struct inode *inode)
  84 {
  85         BTRFS_I(inode)->last_trans = trans->transaction->transid;
  86         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
  87 }
  88
  89 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
  90                           struct btrfs_root *root);
  91 int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans,
  92                                  struct btrfs_root *root);
  93 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
  94                                                    int num_items);
  95 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
  96                                                   int num_blocks);
  97 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root,
  98                                                           int num_blocks);
  99 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
 100                                                          int num_blocks);
 101 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 102 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 103                                      struct btrfs_root *root);
 104 int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,
 105                             struct btrfs_root *root);
 106
 107 int btrfs_add_dead_root(struct btrfs_root *root);
 108 int btrfs_drop_dead_root(struct btrfs_root *root);
 109 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
 110 int btrfs_clean_old_snapshots(struct btrfs_root *root);
 111 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 112                              struct btrfs_root *root);
 113 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 114                                    struct btrfs_root *root,
 115                                    int wait_for_unblock);
 116 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 117                                    struct btrfs_root *root);
 118 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 119                                  struct btrfs_root *root);
 120 void btrfs_throttle(struct btrfs_root *root);
 121 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 122                                 struct btrfs_root *root);
 123 int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
 124                                 struct extent_io_tree *dirty_pages, int mark);
 125 int btrfs_write_marked_extents(struct btrfs_root *root,
 126                                 struct extent_io_tree *dirty_pages, int mark);
 127 int btrfs_wait_marked_extents(struct btrfs_root *root,
 128                                 struct extent_io_tree *dirty_pages, int mark);
 129 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 130 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 131 #endif