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 enum btrfs_trans_type {
  51         TRANS_START,
  52         TRANS_JOIN,
  53         TRANS_USERSPACE,
  54         TRANS_JOIN_NOLOCK,
  55         TRANS_ATTACH,
  56 };
  57
  58 struct btrfs_trans_handle {
  59         u64 transid;
  60         u64 bytes_reserved;
  61         u64 qgroup_reserved;
  62         unsigned long use_count;
  63         unsigned long blocks_reserved;
  64         unsigned long blocks_used;
  65         unsigned long delayed_ref_updates;
  66         struct btrfs_transaction *transaction;
  67         struct btrfs_block_rsv *block_rsv;
  68         struct btrfs_block_rsv *orig_rsv;
  69         short aborted;
  70         short adding_csums;
  71         enum btrfs_trans_type type;
  72         /*
  73          * this root is only needed to validate that the root passed to
  74          * start_transaction is the same as the one passed to end_transaction.
  75          * Subvolume quota depends on this
  76          */
  77         struct btrfs_root *root;
  78         struct seq_list delayed_ref_elem;
  79         struct list_head qgroup_ref_list;
  80         struct list_head new_bgs;
  81 };
  82
  83 struct btrfs_pending_snapshot {
  84         struct dentry *dentry;
  85         struct btrfs_root *root;
  86         struct btrfs_root *snap;
  87         struct btrfs_qgroup_inherit *inherit;
  88         /* block reservation for the operation */
  89         struct btrfs_block_rsv block_rsv;
  90         /* extra metadata reseration for relocation */
  91         int error;
  92         bool readonly;
  93         struct list_head list;
  94 };
  95
  96 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
  97                                               struct inode *inode)
  98 {
  99         BTRFS_I(inode)->last_trans = trans->transaction->transid;
 100         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 101         BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 102 }
 103
 104 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 105                           struct btrfs_root *root);
 106 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 107                                                    int num_items);
 108 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 109                                         struct btrfs_root *root, int num_items);
 110 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 111 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 112 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 113 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 114 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 115 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 116                                      struct btrfs_root *root);
 117
 118 int btrfs_add_dead_root(struct btrfs_root *root);
 119 int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
 120 int btrfs_clean_old_snapshots(struct btrfs_root *root);
 121 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 122                              struct btrfs_root *root);
 123 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 124                                    struct btrfs_root *root,
 125                                    int wait_for_unblock);
 126 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 127                                    struct btrfs_root *root);
 128 int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
 129                                 struct btrfs_root *root);
 130 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 131                                  struct btrfs_root *root);
 132 void btrfs_throttle(struct btrfs_root *root);
 133 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 134                                 struct btrfs_root *root);
 135 int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
 136                                 struct extent_io_tree *dirty_pages, int mark);
 137 int btrfs_write_marked_extents(struct btrfs_root *root,
 138                                 struct extent_io_tree *dirty_pages, int mark);
 139 int btrfs_wait_marked_extents(struct btrfs_root *root,
 140                                 struct extent_io_tree *dirty_pages, int mark);
 141 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 142 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 143 void put_transaction(struct btrfs_transaction *transaction);
 144 #endif