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 enum btrfs_trans_state { 26 TRANS_STATE_RUNNING = 0, 27 TRANS_STATE_BLOCKED = 1, 28 TRANS_STATE_COMMIT_START = 2, 29 TRANS_STATE_COMMIT_DOING = 3, 30 TRANS_STATE_UNBLOCKED = 4, 31 TRANS_STATE_COMPLETED = 5, 32 TRANS_STATE_MAX = 6, 33 }; 34 35 struct btrfs_transaction { 36 u64 transid; 37 /* 38 * total external writers(USERSPACE/START/ATTACH) in this 39 * transaction, it must be zero before the transaction is 40 * being committed 41 */ 42 atomic_t num_extwriters; 43 /* 44 * total writers in this transaction, it must be zero before the 45 * transaction can end 46 */ 47 atomic_t num_writers; 48 atomic_t use_count; 49 50 /* Be protected by fs_info->trans_lock when we want to change it. */ 51 enum btrfs_trans_state state; 52 struct list_head list; 53 struct extent_io_tree dirty_pages; 54 unsigned long start_time; 55 wait_queue_head_t writer_wait; 56 wait_queue_head_t commit_wait; 57 struct list_head pending_snapshots; 58 struct list_head pending_chunks; 59 struct list_head switch_commits; 60 struct btrfs_delayed_ref_root delayed_refs; 61 int aborted; 62 }; 63 64 #define __TRANS_FREEZABLE (1U << 0) 65 66 #define __TRANS_USERSPACE (1U << 8) 67 #define __TRANS_START (1U << 9) 68 #define __TRANS_ATTACH (1U << 10) 69 #define __TRANS_JOIN (1U << 11) 70 #define __TRANS_JOIN_NOLOCK (1U << 12) 71 #define __TRANS_DUMMY (1U << 13) 72 73 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE) 74 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) 75 #define TRANS_ATTACH (__TRANS_ATTACH) 76 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) 77 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) 78 79 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \ 80 __TRANS_ATTACH) 81 82 #define BTRFS_SEND_TRANS_STUB 1 83 84 struct btrfs_trans_handle { 85 u64 transid; 86 u64 bytes_reserved; 87 u64 qgroup_reserved; 88 unsigned long use_count; 89 unsigned long blocks_reserved; 90 unsigned long blocks_used; 91 unsigned long delayed_ref_updates; 92 struct btrfs_transaction *transaction; 93 struct btrfs_block_rsv *block_rsv; 94 struct btrfs_block_rsv *orig_rsv; 95 short aborted; 96 short adding_csums; 97 bool allocating_chunk; 98 bool reloc_reserved; 99 bool sync; 100 unsigned int type; 101 /* 102 * this root is only needed to validate that the root passed to 103 * start_transaction is the same as the one passed to end_transaction. 104 * Subvolume quota depends on this 105 */ 106 struct btrfs_root *root; 107 struct seq_list delayed_ref_elem; 108 struct list_head qgroup_ref_list; 109 struct list_head new_bgs; 110 }; 111 112 struct btrfs_pending_snapshot { 113 struct dentry *dentry; 114 struct inode *dir; 115 struct btrfs_root *root; 116 struct btrfs_root *snap; 117 struct btrfs_qgroup_inherit *inherit; 118 /* block reservation for the operation */ 119 struct btrfs_block_rsv block_rsv; 120 u64 qgroup_reserved; 121 /* extra metadata reseration for relocation */ 122 int error; 123 bool readonly; 124 struct list_head list; 125 }; 126 127 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, 128 struct inode *inode) 129 { 130 BTRFS_I(inode)->last_trans = trans->transaction->transid; 131 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; 132 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; 133 } 134 135 int btrfs_end_transaction(struct btrfs_trans_handle *trans, 136 struct btrfs_root *root); 137 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 138 int num_items); 139 struct btrfs_trans_handle *btrfs_start_transaction_lflush( 140 struct btrfs_root *root, int num_items); 141 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); 142 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root); 143 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); 144 struct btrfs_trans_handle *btrfs_attach_transaction_barrier( 145 struct btrfs_root *root); 146 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root); 147 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid); 148 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, 149 struct btrfs_root *root); 150 151 void btrfs_add_dead_root(struct btrfs_root *root); 152 int btrfs_defrag_root(struct btrfs_root *root); 153 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root); 154 int btrfs_commit_transaction(struct btrfs_trans_handle *trans, 155 struct btrfs_root *root); 156 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 157 struct btrfs_root *root, 158 int wait_for_unblock); 159 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, 160 struct btrfs_root *root); 161 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, 162 struct btrfs_root *root); 163 void btrfs_throttle(struct btrfs_root *root); 164 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 165 struct btrfs_root *root); 166 int btrfs_write_marked_extents(struct btrfs_root *root, 167 struct extent_io_tree *dirty_pages, int mark); 168 int btrfs_wait_marked_extents(struct btrfs_root *root, 169 struct extent_io_tree *dirty_pages, int mark); 170 int btrfs_transaction_blocked(struct btrfs_fs_info *info); 171 int btrfs_transaction_in_commit(struct btrfs_fs_info *info); 172 void btrfs_put_transaction(struct btrfs_transaction *transaction); 173 #endif 174