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 struct list_head list; 62 struct extent_io_tree dirty_pages; 63 unsigned long start_time; 64 wait_queue_head_t writer_wait; 65 wait_queue_head_t commit_wait; 66 wait_queue_head_t pending_wait; 67 struct list_head pending_snapshots; 68 struct list_head pending_chunks; 69 struct list_head switch_commits; 70 struct list_head dirty_bgs; 71 struct list_head io_bgs; 72 struct list_head dropped_roots; 73 u64 num_dirty_bgs; 74 75 /* 76 * we need to make sure block group deletion doesn't race with 77 * free space cache writeout. This mutex keeps them from stomping 78 * on each other 79 */ 80 struct mutex cache_write_mutex; 81 spinlock_t dirty_bgs_lock; 82 /* Protected by spin lock fs_info->unused_bgs_lock. */ 83 struct list_head deleted_bgs; 84 spinlock_t dropped_roots_lock; 85 struct btrfs_delayed_ref_root delayed_refs; 86 int aborted; 87 struct btrfs_fs_info *fs_info; 88 }; 89 90 #define __TRANS_FREEZABLE (1U << 0) 91 92 #define __TRANS_USERSPACE (1U << 8) 93 #define __TRANS_START (1U << 9) 94 #define __TRANS_ATTACH (1U << 10) 95 #define __TRANS_JOIN (1U << 11) 96 #define __TRANS_JOIN_NOLOCK (1U << 12) 97 #define __TRANS_DUMMY (1U << 13) 98 99 #define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE) 100 #define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) 101 #define TRANS_ATTACH (__TRANS_ATTACH) 102 #define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) 103 #define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) 104 105 #define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \ 106 __TRANS_ATTACH) 107 108 #define BTRFS_SEND_TRANS_STUB ((void *)1) 109 110 struct btrfs_trans_handle { 111 u64 transid; 112 u64 bytes_reserved; 113 u64 chunk_bytes_reserved; 114 unsigned long use_count; 115 unsigned long blocks_reserved; 116 unsigned long delayed_ref_updates; 117 struct btrfs_transaction *transaction; 118 struct btrfs_block_rsv *block_rsv; 119 struct btrfs_block_rsv *orig_rsv; 120 short aborted; 121 bool adding_csums; 122 bool allocating_chunk; 123 bool can_flush_pending_bgs; 124 bool reloc_reserved; 125 bool sync; 126 bool dirty; 127 unsigned int type; 128 struct btrfs_root *root; 129 struct btrfs_fs_info *fs_info; 130 struct list_head new_bgs; 131 }; 132 133 struct btrfs_pending_snapshot { 134 struct dentry *dentry; 135 struct inode *dir; 136 struct btrfs_root *root; 137 struct btrfs_root_item *root_item; 138 struct btrfs_root *snap; 139 struct btrfs_qgroup_inherit *inherit; 140 struct btrfs_path *path; 141 /* block reservation for the operation */ 142 struct btrfs_block_rsv block_rsv; 143 u64 qgroup_reserved; 144 /* extra metadata reservation for relocation */ 145 int error; 146 bool readonly; 147 struct list_head list; 148 }; 149 150 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, 151 struct inode *inode) 152 { 153 spin_lock(&BTRFS_I(inode)->lock); 154 BTRFS_I(inode)->last_trans = trans->transaction->transid; 155 BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; 156 BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; 157 spin_unlock(&BTRFS_I(inode)->lock); 158 } 159 160 /* 161 * Make qgroup codes to skip given qgroupid, means the old/new_roots for 162 * qgroup won't contain the qgroupid in it. 163 */ 164 static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans, 165 u64 qgroupid) 166 { 167 struct btrfs_delayed_ref_root *delayed_refs; 168 169 delayed_refs = &trans->transaction->delayed_refs; 170 WARN_ON(delayed_refs->qgroup_to_skip); 171 delayed_refs->qgroup_to_skip = qgroupid; 172 } 173 174 static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans) 175 { 176 struct btrfs_delayed_ref_root *delayed_refs; 177 178 delayed_refs = &trans->transaction->delayed_refs; 179 WARN_ON(!delayed_refs->qgroup_to_skip); 180 delayed_refs->qgroup_to_skip = 0; 181 } 182 183 int btrfs_end_transaction(struct btrfs_trans_handle *trans); 184 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, 185 unsigned int num_items); 186 struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv( 187 struct btrfs_root *root, 188 unsigned int num_items, 189 int min_factor); 190 struct btrfs_trans_handle *btrfs_start_transaction_lflush( 191 struct btrfs_root *root, 192 unsigned int num_items); 193 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); 194 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root); 195 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); 196 struct btrfs_trans_handle *btrfs_attach_transaction_barrier( 197 struct btrfs_root *root); 198 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root); 199 int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid); 200 201 void btrfs_add_dead_root(struct btrfs_root *root); 202 int btrfs_defrag_root(struct btrfs_root *root); 203 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root); 204 int btrfs_commit_transaction(struct btrfs_trans_handle *trans); 205 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, 206 int wait_for_unblock); 207 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans); 208 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans); 209 void btrfs_throttle(struct btrfs_fs_info *fs_info); 210 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, 211 struct btrfs_root *root); 212 int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info, 213 struct extent_io_tree *dirty_pages, int mark); 214 int btrfs_wait_extents(struct btrfs_fs_info *fs_info, 215 struct extent_io_tree *dirty_pages); 216 int btrfs_wait_tree_log_extents(struct btrfs_root *root, int mark); 217 int btrfs_transaction_blocked(struct btrfs_fs_info *info); 218 int btrfs_transaction_in_commit(struct btrfs_fs_info *info); 219 void btrfs_put_transaction(struct btrfs_transaction *transaction); 220 void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info); 221 void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, 222 struct btrfs_root *root); 223 #endif 224