LXR linux/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
  25struct 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
  50struct 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
  73struct 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
  86static 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
  93int btrfs_end_transaction(struct btrfs_trans_handle *trans,
  94                          struct btrfs_root *root);
  95int btrfs_end_transaction_nolock(struct btrfs_trans_handle *trans,
  96                                 struct btrfs_root *root);
  97struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
  98                                                   int num_items);
  99struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 100struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 101struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 102int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 103int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 104                                     struct btrfs_root *root);
 105
 106int btrfs_add_dead_root(struct btrfs_root *root);
 107int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
 108int btrfs_clean_old_snapshots(struct btrfs_root *root);
 109int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 110                             struct btrfs_root *root);
 111int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 112                                   struct btrfs_root *root,
 113                                   int wait_for_unblock);
 114int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 115                                   struct btrfs_root *root);
 116int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
 117                                struct btrfs_root *root);
 118int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 119                                 struct btrfs_root *root);
 120void btrfs_throttle(struct btrfs_root *root);
 121int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 122                                struct btrfs_root *root);
 123int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
 124                                struct extent_io_tree *dirty_pages, int mark);
 125int btrfs_write_marked_extents(struct btrfs_root *root,
 126                                struct extent_io_tree *dirty_pages, int mark);
 127int btrfs_wait_marked_extents(struct btrfs_root *root,
 128                                struct extent_io_tree *dirty_pages, int mark);
 129int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 130int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 131void put_transaction(struct btrfs_transaction *transaction);
 132#endif
 133