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 22 #include <linux/refcount.h> 23 #include "btrfs_inode.h" 24 #include "delayed-ref.h" 25 #include "ctree.h" 26 27 enum btrfs_trans_state { 28 TRANS_STATE_RUNNING = 0, 29 TRANS_STATE_BLOCKED = 1, 30 TRANS_STATE_COMMIT_START = 2, 31 TRANS_STATE_COMMIT_DOING = 3, 32 TRANS_STATE_UNBLOCKED = 4, 33 TRANS_STATE_COMPLETED = 5, 34 TRANS_STATE_MAX = 6, 35 }; 36 37 #define BTRFS_TRANS_HAVE_FREE_BGS 0 38 #define BTRFS_TRANS_DIRTY_BG_RUN 1 39 #define BTRFS_TRANS_CACHE_ENOSPC 2 40 41 struct btrfs_transaction { 42 u64 transid; 43 /* 44 * total external writers(USERSPACE/START/ATTACH) in this 45 * transaction, it must be zero before the transaction is 46 * being committed 47 */ 48 atomic_t num_extwriters; 49 /* 50 * total writers in this transaction, it must be zero before the 51 * transaction can end 52 */ 53 atomic_t num_writers; 54 refcount_t use_count; 55 atomic_t pending_ordered; 56 57 unsigned long flags; 58 59 /* Be protected by fs_info->trans_lock when we want to change it. */ 60 enum btrfs_trans_state state; 61 int aborted; 62 struct list_head list; 63 struct extent_io_tree dirty_pages; 64 unsigned long start_time; 65 wait_queue_head_t writer_wait; 66 wait_queue_head_t commit_wait; 67 wait_queue_head_t pending_wait; 68 struct list_head pending_snapshots; 69 struct list_head pending_chunks; 70 struct list_head switch_commits; 71 struct list_head dirty_bgs; 72 73 /* 74 * There is no explicit lock which protects io_bgs, rather its 75 * consistency is implied by the fact that all the sites which modify 76 * it do so under some form of transaction critical section, namely: 77 * 78 * - btrfs_start_dirty_block_groups - This function can only ever be 79 * run by one of the transaction committers. Refer to 80 * BTRFS_TRANS_DIRTY_BG_RUN usage in btrfs_commit_transaction 81 * 82 * - btrfs_write_dirty_blockgroups - this is called by 83 * commit_cowonly_roots from transaction critical section 84 * (TRANS_STATE_COMMIT_DOING) 85 * 86 * - btrfs_cleanup_dirty_bgs - called on transaction abort 87 */ 88 struct list_head io_bgs; 89 struct list_head dropped_roots; 90 91 /* 92 * we need to make sure block group deletion doesn't race with 93 * free space cache writeout. This mutex keeps them from stomping 94 * on each other 95 */ 96 struct mutex cache_write_mutex; 97 spinlock_t dirty_bgs_lock; 98 unsigned int num_dirty_bgs; 99 /* Protected by spin lock fs_info->unused_bgs_lock. */ 100 struct list_head deleted_bgs; 101 spinlock_t dropped_roots_lock; 102 struct btrfs_delayed_ref_root delayed_refs; 103 struct btrfs_fs_info *fs_info; 104 }; 105 106 #define __TRANS_FREEZABLE (1U << 0) 107 108 #define __TRANS_START (1U << 9) 109 #define __TRANS_ATTACH (1U << 10) 110 #define __TRANS_JOIN (1U << 11) 111 #define __TRANS_JOIN_NOLOCK (1U << 12) 112 #define __TRANS_DUMMY (1U << 13) 113 114 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) 115 #define TRANS_ATTACH (__TRANS_ATTACH) 116 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) 117 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) 118 119 #define TRANS_EXTWRITERS (__TRANS_START | __TRANS_ATTACH) 120 121 #define BTRFS_SEND_TRANS_STUB ((void *)1) 122 123 struct btrfs_trans_handle { 124 u64 transid; 125 u64 bytes_reserved; 126 u64 chunk_bytes_reserved; 127 unsigned long delayed_ref_updates; 128 struct btrfs_transaction *transaction; 129 struct btrfs_block_rsv *block_rsv; 130 struct btrfs_block_rsv *orig_rsv; 131 refcount_t use_count; 132 unsigned int type; 133 short aborted; 134 bool adding_csums; 135 bool allocating_chunk; 136 bool can_flush_pending_bgs; 137 bool reloc_reserved; 138 bool sync; 139 bool dirty; 140 struct btrfs_root *root; 141 struct btrfs_fs_info *fs_info; 142 struct list_head new_bgs; 143 }; 144 145 struct btrfs_pending_snapshot { 146 struct dentry *dentry; 147 struct inode *dir; 148 struct btrfs_root *root; 149 struct btrfs_root_item *root_item; 150 struct btrfs_root *snap; 151 struct btrfs_qgroup_inherit *inherit; 152 struct btrfs_path *path; 153 /* block reservation for the operation */ 154 struct btrfs_block_rsv block_rsv; 155 u64 qgroup_reserved; 156 /* extra metadata reservation for relocation */ 157 int error; 158 bool readonly; 159 struct list_head list; 160 }; 161 162 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, 163 struct inode *inode) 164 { 165 spin_lock(&BTRFS_I(inode)->lock); 166 BTRFS_I(inode)->last_trans = trans->transaction->transid; 167 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; 168 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; 169 spin_unlock(&BTRFS_I(inode)->lock); 170 } 171 172 /* 173 * Make qgroup codes to skip given qgroupid, means the old/new_roots for 174 * qgroup won't contain the qgroupid in it. 175 */ 176 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans, 177 u64 qgroupid) 178 { 179 struct btrfs_delayed_ref_root *delayed_refs; 180 181 delayed_refs = &trans->transaction->delayed_refs; 182 WARN_ON(delayed_refs->qgroup_to_skip); 183 delayed_refs->qgroup_to_skip = qgroupid; 184 } 185 186 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans) 187 { 188 struct btrfs_delayed_ref_root *delayed_refs; 189 190 delayed_refs = &trans->transaction->delayed_refs; 191 WARN_ON(!delayed_refs->qgroup_to_skip); 192 delayed_refs->qgroup_to_skip = 0; 193 } 194 195 int btrfs_end_transaction(struct btrfs_trans_handle *trans); 196 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 197 unsigned int num_items); 198 struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv( 199 struct btrfs_root *root, 200 unsigned int num_items, 201 int min_factor); 202 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); 203 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root); 204 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); 205 struct btrfs_trans_handle *btrfs_attach_transaction_barrier( 206 struct btrfs_root *root); 207 int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid); 208 209 void btrfs_add_dead_root(struct btrfs_root *root); 210 int btrfs_defrag_root(struct btrfs_root *root); 211 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root); 212 int btrfs_commit_transaction(struct btrfs_trans_handle *trans); 213 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 214 int wait_for_unblock); 215 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans); 216 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans); 217 void btrfs_throttle(struct btrfs_fs_info *fs_info); 218 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 219 struct btrfs_root *root); 220 int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info, 221 struct extent_io_tree *dirty_pages, int mark); 222 int btrfs_wait_extents(struct btrfs_fs_info *fs_info, 223 struct extent_io_tree *dirty_pages); 224 int btrfs_wait_tree_log_extents(struct btrfs_root *root, 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