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 /* 51 * true if there is free bgs operations in this transaction 52 */ 53 int have_free_bgs; 54 55 /* Be protected by fs_info->trans_lock when we want to change it. */ 56 enum btrfs_trans_state state; 57 struct list_head list; 58 struct extent_io_tree dirty_pages; 59 unsigned long start_time; 60 wait_queue_head_t writer_wait; 61 wait_queue_head_t commit_wait; 62 struct list_head pending_snapshots; 63 struct list_head pending_chunks; 64 struct list_head pending_ordered; 65 struct list_head switch_commits; 66 struct list_head dirty_bgs; 67 struct list_head io_bgs; 68 u64 num_dirty_bgs; 69 70 /* 71 * we need to make sure block group deletion doesn't race with 72 * free space cache writeout. This mutex keeps them from stomping 73 * on each other 74 */ 75 struct mutex cache_write_mutex; 76 spinlock_t dirty_bgs_lock; 77 struct btrfs_delayed_ref_root delayed_refs; 78 int aborted; 79 int dirty_bg_run; 80 }; 81 82 #define __TRANS_FREEZABLE (1U << 0) 83 84 #define __TRANS_USERSPACE (1U << 8) 85 #define __TRANS_START (1U << 9) 86 #define __TRANS_ATTACH (1U << 10) 87 #define __TRANS_JOIN (1U << 11) 88 #define __TRANS_JOIN_NOLOCK (1U << 12) 89 #define __TRANS_DUMMY (1U << 13) 90 91 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE) 92 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) 93 #define TRANS_ATTACH (__TRANS_ATTACH) 94 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) 95 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) 96 97 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \ 98 __TRANS_ATTACH) 99 100 #define BTRFS_SEND_TRANS_STUB ((void *)1) 101 102 struct btrfs_trans_handle { 103 u64 transid; 104 u64 bytes_reserved; 105 u64 qgroup_reserved; 106 unsigned long use_count; 107 unsigned long blocks_reserved; 108 unsigned long blocks_used; 109 unsigned long delayed_ref_updates; 110 struct btrfs_transaction *transaction; 111 struct btrfs_block_rsv *block_rsv; 112 struct btrfs_block_rsv *orig_rsv; 113 short aborted; 114 short adding_csums; 115 bool allocating_chunk; 116 bool reloc_reserved; 117 bool sync; 118 unsigned int type; 119 /* 120 * this root is only needed to validate that the root passed to 121 * start_transaction is the same as the one passed to end_transaction. 122 * Subvolume quota depends on this 123 */ 124 struct btrfs_root *root; 125 struct seq_list delayed_ref_elem; 126 struct list_head ordered; 127 struct list_head qgroup_ref_list; 128 struct list_head new_bgs; 129 }; 130 131 struct btrfs_pending_snapshot { 132 struct dentry *dentry; 133 struct inode *dir; 134 struct btrfs_root *root; 135 struct btrfs_root *snap; 136 struct btrfs_qgroup_inherit *inherit; 137 /* block reservation for the operation */ 138 struct btrfs_block_rsv block_rsv; 139 u64 qgroup_reserved; 140 /* extra metadata reseration for relocation */ 141 int error; 142 bool readonly; 143 struct list_head list; 144 }; 145 146 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, 147 struct inode *inode) 148 { 149 spin_lock(&BTRFS_I(inode)->lock); 150 BTRFS_I(inode)->last_trans = trans->transaction->transid; 151 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; 152 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; 153 spin_unlock(&BTRFS_I(inode)->lock); 154 } 155 156 int btrfs_end_transaction(struct btrfs_trans_handle *trans, 157 struct btrfs_root *root); 158 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 159 int num_items); 160 struct btrfs_trans_handle *btrfs_start_transaction_lflush( 161 struct btrfs_root *root, int num_items); 162 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); 163 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root); 164 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); 165 struct btrfs_trans_handle *btrfs_attach_transaction_barrier( 166 struct btrfs_root *root); 167 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root); 168 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid); 169 170 void btrfs_add_dead_root(struct btrfs_root *root); 171 int btrfs_defrag_root(struct btrfs_root *root); 172 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root); 173 int btrfs_commit_transaction(struct btrfs_trans_handle *trans, 174 struct btrfs_root *root); 175 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 176 struct btrfs_root *root, 177 int wait_for_unblock); 178 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, 179 struct btrfs_root *root); 180 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, 181 struct btrfs_root *root); 182 void btrfs_throttle(struct btrfs_root *root); 183 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 184 struct btrfs_root *root); 185 int btrfs_write_marked_extents(struct btrfs_root *root, 186 struct extent_io_tree *dirty_pages, int mark); 187 int btrfs_wait_marked_extents(struct btrfs_root *root, 188 struct extent_io_tree *dirty_pages, int mark); 189 int btrfs_transaction_blocked(struct btrfs_fs_info *info); 190 int btrfs_transaction_in_commit(struct btrfs_fs_info *info); 191 void btrfs_put_transaction(struct btrfs_transaction *transaction); 192 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info); 193 194 #endif 195