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 #include "ctree.h"
  24
  25 struct btrfs_transaction {
  26         u64 transid;
  27         /*
  28          * total writers in this transaction, it must be zero before the
  29          * transaction can end
  30          */
  31         atomic_t num_writers;
  32         atomic_t use_count;
  33
  34         unsigned long num_joined;
  35
  36         spinlock_t commit_lock;
  37         int in_commit;
  38         int commit_done;
  39         int blocked;
  40         struct list_head list;
  41         struct extent_io_tree dirty_pages;
  42         unsigned long start_time;
  43         wait_queue_head_t writer_wait;
  44         wait_queue_head_t commit_wait;
  45         struct list_head pending_snapshots;
  46         struct btrfs_delayed_ref_root delayed_refs;
  47         int aborted;
  48 };
  49
  50 struct btrfs_trans_handle {
  51         u64 transid;
  52         u64 bytes_reserved;
  53         u64 qgroup_reserved;
  54         unsigned long use_count;
  55         unsigned long blocks_reserved;
  56         unsigned long blocks_used;
  57         unsigned long delayed_ref_updates;
  58         struct btrfs_transaction *transaction;
  59         struct btrfs_block_rsv *block_rsv;
  60         struct btrfs_block_rsv *orig_rsv;
  61         int aborted;
  62         int adding_csums;
  63         /*
  64          * this root is only needed to validate that the root passed to
  65          * start_transaction is the same as the one passed to end_transaction.
  66          * Subvolume quota depends on this
  67          */
  68         struct btrfs_root *root;
  69         struct seq_list delayed_ref_elem;
  70         struct list_head qgroup_ref_list;
  71 };
  72
  73 struct btrfs_pending_snapshot {
  74         struct dentry *dentry;
  75         struct btrfs_root *root;
  76         struct btrfs_root *snap;
  77         struct btrfs_qgroup_inherit *inherit;
  78         /* block reservation for the operation */
  79         struct btrfs_block_rsv block_rsv;
  80         /* extra metadata reseration for relocation */
  81         int error;
  82         bool readonly;
  83         struct list_head list;
  84 };
  85
  86 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
  87                                               struct inode *inode)
  88 {
  89         BTRFS_I(inode)->last_trans = trans->transaction->transid;
  90         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
  91 }
  92
  93 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
  94                           struct btrfs_root *root);
  95 int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans,
  96                                  struct btrfs_root *root);
  97 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
  98                                                    int num_items);
  99 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 100 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 101 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 102 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 103 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 104                                      struct btrfs_root *root);
 105
 106 int btrfs_add_dead_root(struct btrfs_root *root);
 107 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
 108 int btrfs_clean_old_snapshots(struct btrfs_root *root);
 109 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 110                              struct btrfs_root *root);
 111 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 112                                    struct btrfs_root *root,
 113                                    int wait_for_unblock);
 114 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 115                                    struct btrfs_root *root);
 116 int btrfs_end_transaction_dmeta(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 void put_transaction(struct btrfs_transaction *transaction);
 132 #endif