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         atomic_t num_writers;
  31         atomic_t use_count;
  32
  33         unsigned long num_joined;
  34
  35         spinlock_t commit_lock;
  36         int in_commit;
  37         int commit_done;
  38         int blocked;
  39         struct list_head list;
  40         struct extent_io_tree dirty_pages;
  41         unsigned long start_time;
  42         wait_queue_head_t writer_wait;
  43         wait_queue_head_t commit_wait;
  44         struct list_head pending_snapshots;
  45         struct btrfs_delayed_ref_root delayed_refs;
  46 };
  47
  48 struct btrfs_trans_handle {
  49         u64 transid;
  50         u64 bytes_reserved;
  51         unsigned long use_count;
  52         unsigned long blocks_reserved;
  53         unsigned long blocks_used;
  54         unsigned long delayed_ref_updates;
  55         struct btrfs_transaction *transaction;
  56         struct btrfs_block_rsv *block_rsv;
  57         struct btrfs_block_rsv *orig_rsv;
  58 };
  59
  60 struct btrfs_pending_snapshot {
  61         struct dentry *dentry;
  62         struct btrfs_root *root;
  63         struct btrfs_root *snap;
  64         /* block reservation for the operation */
  65         struct btrfs_block_rsv block_rsv;
  66         /* extra metadata reseration for relocation */
  67         int error;
  68         bool readonly;
  69         struct list_head list;
  70 };
  71
  72 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
  73                                               struct inode *inode)
  74 {
  75         BTRFS_I(inode)->last_trans = trans->transaction->transid;
  76         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
  77 }
  78
  79 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
  80                           struct btrfs_root *root);
  81 int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans,
  82                                  struct btrfs_root *root);
  83 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
  84                                                    int num_items);
  85 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
  86 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
  87 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
  88 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
  89 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
  90                                      struct btrfs_root *root);
  91
  92 int btrfs_add_dead_root(struct btrfs_root *root);
  93 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
  94 int btrfs_clean_old_snapshots(struct btrfs_root *root);
  95 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
  96                              struct btrfs_root *root);
  97 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
  98                                    struct btrfs_root *root,
  99                                    int wait_for_unblock);
 100 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 101                                    struct btrfs_root *root);
 102 int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
 103                                 struct btrfs_root *root);
 104 int btrfs_should_end_transaction(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, int mark);
 111 int btrfs_write_marked_extents(struct btrfs_root *root,
 112                                 struct extent_io_tree *dirty_pages, int mark);
 113 int btrfs_wait_marked_extents(struct btrfs_root *root,
 114                                 struct extent_io_tree *dirty_pages, int mark);
 115 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 116 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 117 #endif