fs/btrfs/transaction.h

   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 struct btrfs_transaction {
  26         u64 transid;
  27         /*
  28          * total external writers(USERSPACE/START/ATTACH) in this
  29          * transaction, it must be zero before the transaction is
  30          * being committed
  31          */
  32         atomic_t num_extwriters;
  33         /*
  34          * total writers in this transaction, it must be zero before the
  35          * transaction can end
  36          */
  37         atomic_t num_writers;
  38         atomic_t use_count;
  39
  40         spinlock_t commit_lock;
  41         int in_commit;
  42         int commit_done;
  43         int blocked;
  44         struct list_head list;
  45         struct extent_io_tree dirty_pages;
  46         unsigned long start_time;
  47         wait_queue_head_t writer_wait;
  48         wait_queue_head_t commit_wait;
  49         struct list_head pending_snapshots;
  50         struct list_head ordered_operations;
  51         struct btrfs_delayed_ref_root delayed_refs;
  52         int aborted;
  53 };
  54
  55 #define __TRANS_FREEZABLE       (1U << 0)
  56
  57 #define __TRANS_USERSPACE       (1U << 8)
  58 #define __TRANS_START           (1U << 9)
  59 #define __TRANS_ATTACH          (1U << 10)
  60 #define __TRANS_JOIN            (1U << 11)
  61 #define __TRANS_JOIN_NOLOCK     (1U << 12)
  62
  63 #define TRANS_USERSPACE         (__TRANS_USERSPACE | __TRANS_FREEZABLE)
  64 #define TRANS_START             (__TRANS_START | __TRANS_FREEZABLE)
  65 #define TRANS_ATTACH            (__TRANS_ATTACH)
  66 #define TRANS_JOIN              (__TRANS_JOIN | __TRANS_FREEZABLE)
  67 #define TRANS_JOIN_NOLOCK       (__TRANS_JOIN_NOLOCK)
  68
  69 #define TRANS_EXTWRITERS        (__TRANS_USERSPACE | __TRANS_START |    \
  70                                  __TRANS_ATTACH)
  71
  72 struct btrfs_trans_handle {
  73         u64 transid;
  74         u64 bytes_reserved;
  75         u64 qgroup_reserved;
  76         unsigned long use_count;
  77         unsigned long blocks_reserved;
  78         unsigned long blocks_used;
  79         unsigned long delayed_ref_updates;
  80         struct btrfs_transaction *transaction;
  81         struct btrfs_block_rsv *block_rsv;
  82         struct btrfs_block_rsv *orig_rsv;
  83         short aborted;
  84         short adding_csums;
  85         bool allocating_chunk;
  86         unsigned int type;
  87         /*
  88          * this root is only needed to validate that the root passed to
  89          * start_transaction is the same as the one passed to end_transaction.
  90          * Subvolume quota depends on this
  91          */
  92         struct btrfs_root *root;
  93         struct seq_list delayed_ref_elem;
  94         struct list_head qgroup_ref_list;
  95         struct list_head new_bgs;
  96 };
  97
  98 struct btrfs_pending_snapshot {
  99         struct dentry *dentry;
 100         struct inode *dir;
 101         struct btrfs_root *root;
 102         struct btrfs_root *snap;
 103         struct btrfs_qgroup_inherit *inherit;
 104         /* block reservation for the operation */
 105         struct btrfs_block_rsv block_rsv;
 106         u64 qgroup_reserved;
 107         /* extra metadata reseration for relocation */
 108         int error;
 109         bool readonly;
 110         struct list_head list;
 111 };
 112
 113 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
 114                                               struct inode *inode)
 115 {
 116         BTRFS_I(inode)->last_trans = trans->transaction->transid;
 117         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 118         BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 119 }
 120
 121 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 122                           struct btrfs_root *root);
 123 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 124                                                    int num_items);
 125 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 126                                         struct btrfs_root *root, int num_items);
 127 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 128 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 129 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 130 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
 131                                         struct btrfs_root *root);
 132 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 133 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 134 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 135                                      struct btrfs_root *root);
 136
 137 int btrfs_add_dead_root(struct btrfs_root *root);
 138 int btrfs_defrag_root(struct btrfs_root *root);
 139 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
 140 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 141                              struct btrfs_root *root);
 142 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 143                                    struct btrfs_root *root,
 144                                    int wait_for_unblock);
 145 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 146                                    struct btrfs_root *root);
 147 int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
 148                                 struct btrfs_root *root);
 149 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 150                                  struct btrfs_root *root);
 151 void btrfs_throttle(struct btrfs_root *root);
 152 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 153                                 struct btrfs_root *root);
 154 int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
 155                                 struct extent_io_tree *dirty_pages, int mark);
 156 int btrfs_write_marked_extents(struct btrfs_root *root,
 157                                 struct extent_io_tree *dirty_pages, int mark);
 158 int btrfs_wait_marked_extents(struct btrfs_root *root,
 159                                 struct extent_io_tree *dirty_pages, int mark);
 160 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 161 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 162 #endif