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 #define BTRFS_TRANS_HAVE_FREE_BGS 0 36 #define BTRFS_TRANS_DIRTY_BG_RUN 1 37 #define BTRFS_TRANS_CACHE_ENOSPC 2 38 39 struct btrfs_transaction { 40 u64 transid; 41 /* 42 * total external writers(USERSPACE/START/ATTACH) in this 43 * transaction, it must be zero before the transaction is 44 * being committed 45 */ 46 atomic_t num_extwriters; 47 /* 48 * total writers in this transaction, it must be zero before the 49 * transaction can end 50 */ 51 atomic_t num_writers; 52 atomic_t use_count; 53 atomic_t pending_ordered; 54 55 unsigned long flags; 56 57 /* Be protected by fs_info->trans_lock when we want to change it. */ 58 enum btrfs_trans_state state; 59 struct list_head list; 60 struct extent_io_tree dirty_pages; 61 unsigned long start_time; 62 wait_queue_head_t writer_wait; 63 wait_queue_head_t commit_wait; 64 wait_queue_head_t pending_wait; 65 struct list_head pending_snapshots; 66 struct list_head pending_chunks; 67 struct list_head switch_commits; 68 struct list_head dirty_bgs; 69 struct list_head io_bgs; 70 struct list_head dropped_roots; 71 u64 num_dirty_bgs; 72 73 /* 74 * we need to make sure block group deletion doesn't race with 75 * free space cache writeout. This mutex keeps them from stomping 76 * on each other 77 */ 78 struct mutex cache_write_mutex; 79 spinlock_t dirty_bgs_lock; 80 /* Protected by spin lock fs_info->unused_bgs_lock. */ 81 struct list_head deleted_bgs; 82 spinlock_t dropped_roots_lock; 83 struct btrfs_delayed_ref_root delayed_refs; 84 int aborted; 85 }; 86 87 #define __TRANS_FREEZABLE (1U << 0) 88 89 #define __TRANS_USERSPACE (1U << 8) 90 #define __TRANS_START (1U << 9) 91 #define __TRANS_ATTACH (1U << 10) 92 #define __TRANS_JOIN (1U << 11) 93 #define __TRANS_JOIN_NOLOCK (1U << 12) 94 #define __TRANS_DUMMY (1U << 13) 95 96 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE) 97 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) 98 #define TRANS_ATTACH (__TRANS_ATTACH) 99 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) 100 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) 101 102 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \ 103 __TRANS_ATTACH) 104 105 #define BTRFS_SEND_TRANS_STUB ((void *)1) 106 107 struct btrfs_trans_handle { 108 u64 transid; 109 u64 bytes_reserved; 110 u64 chunk_bytes_reserved; 111 unsigned long use_count; 112 unsigned long blocks_reserved; 113 unsigned long delayed_ref_updates; 114 struct btrfs_transaction *transaction; 115 struct btrfs_block_rsv *block_rsv; 116 struct btrfs_block_rsv *orig_rsv; 117 short aborted; 118 short adding_csums; 119 bool allocating_chunk; 120 bool can_flush_pending_bgs; 121 bool reloc_reserved; 122 bool sync; 123 bool dirty; 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 btrfs_fs_info *fs_info; 132 struct seq_list delayed_ref_elem; 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_item *root_item; 142 struct btrfs_root *snap; 143 struct btrfs_qgroup_inherit *inherit; 144 struct btrfs_path *path; 145 /* block reservation for the operation */ 146 struct btrfs_block_rsv block_rsv; 147 u64 qgroup_reserved; 148 /* extra metadata reservation for relocation */ 149 int error; 150 bool readonly; 151 struct list_head list; 152 }; 153 154 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, 155 struct inode *inode) 156 { 157 spin_lock(&BTRFS_I(inode)->lock); 158 BTRFS_I(inode)->last_trans = trans->transaction->transid; 159 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; 160 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; 161 spin_unlock(&BTRFS_I(inode)->lock); 162 } 163 164 /* 165 * Make qgroup codes to skip given qgroupid, means the old/new_roots for 166 * qgroup won't contain the qgroupid in it. 167 */ 168 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans, 169 u64 qgroupid) 170 { 171 struct btrfs_delayed_ref_root *delayed_refs; 172 173 delayed_refs = &trans->transaction->delayed_refs; 174 WARN_ON(delayed_refs->qgroup_to_skip); 175 delayed_refs->qgroup_to_skip = qgroupid; 176 } 177 178 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans) 179 { 180 struct btrfs_delayed_ref_root *delayed_refs; 181 182 delayed_refs = &trans->transaction->delayed_refs; 183 WARN_ON(!delayed_refs->qgroup_to_skip); 184 delayed_refs->qgroup_to_skip = 0; 185 } 186 187 int btrfs_end_transaction(struct btrfs_trans_handle *trans, 188 struct btrfs_root *root); 189 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 190 unsigned int num_items); 191 struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv( 192 struct btrfs_root *root, 193 unsigned int num_items, 194 int min_factor); 195 struct btrfs_trans_handle *btrfs_start_transaction_lflush( 196 struct btrfs_root *root, 197 unsigned int num_items); 198 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); 199 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root); 200 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); 201 struct btrfs_trans_handle *btrfs_attach_transaction_barrier( 202 struct btrfs_root *root); 203 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root); 204 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid); 205 206 void btrfs_add_dead_root(struct btrfs_root *root); 207 int btrfs_defrag_root(struct btrfs_root *root); 208 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root); 209 int btrfs_commit_transaction(struct btrfs_trans_handle *trans, 210 struct btrfs_root *root); 211 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 212 struct btrfs_root *root, 213 int wait_for_unblock); 214 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, 215 struct btrfs_root *root); 216 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, 217 struct btrfs_root *root); 218 void btrfs_throttle(struct btrfs_root *root); 219 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 220 struct btrfs_root *root); 221 int btrfs_write_marked_extents(struct btrfs_root *root, 222 struct extent_io_tree *dirty_pages, int mark); 223 int btrfs_wait_marked_extents(struct btrfs_root *root, 224 struct extent_io_tree *dirty_pages, int mark); 225 int btrfs_transaction_blocked(struct btrfs_fs_info *info); 226 int btrfs_transaction_in_commit(struct btrfs_fs_info *info); 227 void btrfs_put_transaction(struct btrfs_transaction *transaction); 228 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info); 229 void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, 230 struct btrfs_root *root); 231 #endif 232