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 struct list_head dropped_roots; 69 u64 num_dirty_bgs; 70 71 /* 72 * we need to make sure block group deletion doesn't race with 73 * free space cache writeout. This mutex keeps them from stomping 74 * on each other 75 */ 76 struct mutex cache_write_mutex; 77 spinlock_t dirty_bgs_lock; 78 struct list_head deleted_bgs; 79 spinlock_t deleted_bgs_lock; 80 spinlock_t dropped_roots_lock; 81 struct btrfs_delayed_ref_root delayed_refs; 82 int aborted; 83 int dirty_bg_run; 84 }; 85 86 #define __TRANS_FREEZABLE (1U << 0) 87 88 #define __TRANS_USERSPACE (1U << 8) 89 #define __TRANS_START (1U << 9) 90 #define __TRANS_ATTACH (1U << 10) 91 #define __TRANS_JOIN (1U << 11) 92 #define __TRANS_JOIN_NOLOCK (1U << 12) 93 #define __TRANS_DUMMY (1U << 13) 94 95 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE) 96 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) 97 #define TRANS_ATTACH (__TRANS_ATTACH) 98 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) 99 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) 100 101 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \ 102 __TRANS_ATTACH) 103 104 #define BTRFS_SEND_TRANS_STUB ((void *)1) 105 106 struct btrfs_trans_handle { 107 u64 transid; 108 u64 bytes_reserved; 109 u64 chunk_bytes_reserved; 110 u64 qgroup_reserved; 111 unsigned long use_count; 112 unsigned long blocks_reserved; 113 unsigned long blocks_used; 114 unsigned long delayed_ref_updates; 115 struct btrfs_transaction *transaction; 116 struct btrfs_block_rsv *block_rsv; 117 struct btrfs_block_rsv *orig_rsv; 118 short aborted; 119 short adding_csums; 120 bool allocating_chunk; 121 bool can_flush_pending_bgs; 122 bool reloc_reserved; 123 bool sync; 124 unsigned int type; 125 /* 126 * this root is only needed to validate that the root passed to 127 * start_transaction is the same as the one passed to end_transaction. 128 * Subvolume quota depends on this 129 */ 130 struct btrfs_root *root; 131 struct seq_list delayed_ref_elem; 132 struct list_head ordered; 133 struct list_head qgroup_ref_list; 134 struct list_head new_bgs; 135 }; 136 137 struct btrfs_pending_snapshot { 138 struct dentry *dentry; 139 struct inode *dir; 140 struct btrfs_root *root; 141 struct btrfs_root *snap; 142 struct btrfs_qgroup_inherit *inherit; 143 /* block reservation for the operation */ 144 struct btrfs_block_rsv block_rsv; 145 u64 qgroup_reserved; 146 /* extra metadata reseration for relocation */ 147 int error; 148 bool readonly; 149 struct list_head list; 150 }; 151 152 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, 153 struct inode *inode) 154 { 155 spin_lock(&BTRFS_I(inode)->lock); 156 BTRFS_I(inode)->last_trans = trans->transaction->transid; 157 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; 158 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; 159 spin_unlock(&BTRFS_I(inode)->lock); 160 } 161 162 /* 163 * Make qgroup codes to skip given qgroupid, means the old/new_roots for 164 * qgroup won't contain the qgroupid in it. 165 */ 166 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans, 167 u64 qgroupid) 168 { 169 struct btrfs_delayed_ref_root *delayed_refs; 170 171 delayed_refs = &trans->transaction->delayed_refs; 172 WARN_ON(delayed_refs->qgroup_to_skip); 173 delayed_refs->qgroup_to_skip = qgroupid; 174 } 175 176 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans) 177 { 178 struct btrfs_delayed_ref_root *delayed_refs; 179 180 delayed_refs = &trans->transaction->delayed_refs; 181 WARN_ON(!delayed_refs->qgroup_to_skip); 182 delayed_refs->qgroup_to_skip = 0; 183 } 184 185 int btrfs_end_transaction(struct btrfs_trans_handle *trans, 186 struct btrfs_root *root); 187 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 188 int num_items); 189 struct btrfs_trans_handle *btrfs_start_transaction_lflush( 190 struct btrfs_root *root, int num_items); 191 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); 192 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root); 193 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); 194 struct btrfs_trans_handle *btrfs_attach_transaction_barrier( 195 struct btrfs_root *root); 196 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root); 197 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid); 198 199 void btrfs_add_dead_root(struct btrfs_root *root); 200 int btrfs_defrag_root(struct btrfs_root *root); 201 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root); 202 int btrfs_commit_transaction(struct btrfs_trans_handle *trans, 203 struct btrfs_root *root); 204 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 205 struct btrfs_root *root, 206 int wait_for_unblock); 207 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, 208 struct btrfs_root *root); 209 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, 210 struct btrfs_root *root); 211 void btrfs_throttle(struct btrfs_root *root); 212 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 213 struct btrfs_root *root); 214 int btrfs_write_marked_extents(struct btrfs_root *root, 215 struct extent_io_tree *dirty_pages, int mark); 216 int btrfs_wait_marked_extents(struct btrfs_root *root, 217 struct extent_io_tree *dirty_pages, int mark); 218 int btrfs_transaction_blocked(struct btrfs_fs_info *info); 219 int btrfs_transaction_in_commit(struct btrfs_fs_info *info); 220 void btrfs_put_transaction(struct btrfs_transaction *transaction); 221 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info); 222 void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, 223 struct btrfs_root *root); 224 #endif 225