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 118