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 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         /* Be protected by fs_info->trans_lock when we want to change it. */
  51         enum btrfs_trans_state state;
  52         struct list_head list;
  53         struct extent_io_tree dirty_pages;
  54         unsigned long start_time;
  55         wait_queue_head_t writer_wait;
  56         wait_queue_head_t commit_wait;
  57         struct list_head pending_snapshots;
  58         struct list_head ordered_operations;
  59         struct list_head pending_chunks;
  60         struct btrfs_delayed_ref_root delayed_refs;
  61         int aborted;
  62 };
  63
  64 #define __TRANS_FREEZABLE       (1U << 0)
  65
  66 #define __TRANS_USERSPACE       (1U << 8)
  67 #define __TRANS_START           (1U << 9)
  68 #define __TRANS_ATTACH          (1U << 10)
  69 #define __TRANS_JOIN            (1U << 11)
  70 #define __TRANS_JOIN_NOLOCK     (1U << 12)
  71
  72 #define TRANS_USERSPACE         (__TRANS_USERSPACE | __TRANS_FREEZABLE)
  73 #define TRANS_START             (__TRANS_START | __TRANS_FREEZABLE)
  74 #define TRANS_ATTACH            (__TRANS_ATTACH)
  75 #define TRANS_JOIN              (__TRANS_JOIN | __TRANS_FREEZABLE)
  76 #define TRANS_JOIN_NOLOCK       (__TRANS_JOIN_NOLOCK)
  77
  78 #define TRANS_EXTWRITERS        (__TRANS_USERSPACE | __TRANS_START |    \
  79                                  __TRANS_ATTACH)
  80
  81 struct btrfs_trans_handle {
  82         u64 transid;
  83         u64 bytes_reserved;
  84         u64 qgroup_reserved;
  85         unsigned long use_count;
  86         unsigned long blocks_reserved;
  87         unsigned long blocks_used;
  88         unsigned long delayed_ref_updates;
  89         struct btrfs_transaction *transaction;
  90         struct btrfs_block_rsv *block_rsv;
  91         struct btrfs_block_rsv *orig_rsv;
  92         short aborted;
  93         short adding_csums;
  94         bool allocating_chunk;
  95         unsigned int type;
  96         /*
  97          * this root is only needed to validate that the root passed to
  98          * start_transaction is the same as the one passed to end_transaction.
  99          * Subvolume quota depends on this
 100          */
 101         struct btrfs_root *root;
 102         struct seq_list delayed_ref_elem;
 103         struct list_head qgroup_ref_list;
 104         struct list_head new_bgs;
 105 };
 106
 107 struct btrfs_pending_snapshot {
 108         struct dentry *dentry;
 109         struct inode *dir;
 110         struct btrfs_root *root;
 111         struct btrfs_root *snap;
 112         struct btrfs_qgroup_inherit *inherit;
 113         /* block reservation for the operation */
 114         struct btrfs_block_rsv block_rsv;
 115         u64 qgroup_reserved;
 116         /* extra metadata reseration for relocation */
 117         int error;
 118         bool readonly;
 119         struct list_head list;
 120 };
 121
 122 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
 123                                               struct inode *inode)
 124 {
 125         BTRFS_I(inode)->last_trans = trans->transaction->transid;
 126         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 127         BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 128 }
 129
 130 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 131                           struct btrfs_root *root);
 132 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 133                                                    int num_items);
 134 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 135                                         struct btrfs_root *root, int num_items);
 136 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 137 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 138 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 139 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
 140                                         struct btrfs_root *root);
 141 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 142 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 143 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 144                                      struct btrfs_root *root);
 145
 146 void btrfs_add_dead_root(struct btrfs_root *root);
 147 int btrfs_defrag_root(struct btrfs_root *root);
 148 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
 149 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 150                              struct btrfs_root *root);
 151 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 152                                    struct btrfs_root *root,
 153                                    int wait_for_unblock);
 154 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 155                                    struct btrfs_root *root);
 156 int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
 157                                 struct btrfs_root *root);
 158 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 159                                  struct btrfs_root *root);
 160 void btrfs_throttle(struct btrfs_root *root);
 161 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 162                                 struct btrfs_root *root);
 163 int btrfs_write_marked_extents(struct btrfs_root *root,
 164                                 struct extent_io_tree *dirty_pages, int mark);
 165 int btrfs_wait_marked_extents(struct btrfs_root *root,
 166                                 struct extent_io_tree *dirty_pages, int mark);
 167 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 168 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 169 #endif