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 list_head switch_commits;
  61         struct btrfs_delayed_ref_root delayed_refs;
  62         int aborted;
  63 };
  64
  65 #define __TRANS_FREEZABLE       (1U << 0)
  66
  67 #define __TRANS_USERSPACE       (1U << 8)
  68 #define __TRANS_START           (1U << 9)
  69 #define __TRANS_ATTACH          (1U << 10)
  70 #define __TRANS_JOIN            (1U << 11)
  71 #define __TRANS_JOIN_NOLOCK     (1U << 12)
  72 #define __TRANS_DUMMY           (1U << 13)
  73
  74 #define TRANS_USERSPACE         (__TRANS_USERSPACE | __TRANS_FREEZABLE)
  75 #define TRANS_START             (__TRANS_START | __TRANS_FREEZABLE)
  76 #define TRANS_ATTACH            (__TRANS_ATTACH)
  77 #define TRANS_JOIN              (__TRANS_JOIN | __TRANS_FREEZABLE)
  78 #define TRANS_JOIN_NOLOCK       (__TRANS_JOIN_NOLOCK)
  79
  80 #define TRANS_EXTWRITERS        (__TRANS_USERSPACE | __TRANS_START |    \
  81                                  __TRANS_ATTACH)
  82
  83 #define BTRFS_SEND_TRANS_STUB   1
  84
  85 struct btrfs_trans_handle {
  86         u64 transid;
  87         u64 bytes_reserved;
  88         u64 qgroup_reserved;
  89         unsigned long use_count;
  90         unsigned long blocks_reserved;
  91         unsigned long blocks_used;
  92         unsigned long delayed_ref_updates;
  93         struct btrfs_transaction *transaction;
  94         struct btrfs_block_rsv *block_rsv;
  95         struct btrfs_block_rsv *orig_rsv;
  96         short aborted;
  97         short adding_csums;
  98         bool allocating_chunk;
  99         bool reloc_reserved;
 100         bool sync;
 101         unsigned int type;
 102         /*
 103          * this root is only needed to validate that the root passed to
 104          * start_transaction is the same as the one passed to end_transaction.
 105          * Subvolume quota depends on this
 106          */
 107         struct btrfs_root *root;
 108         struct seq_list delayed_ref_elem;
 109         struct list_head qgroup_ref_list;
 110         struct list_head new_bgs;
 111 };
 112
 113 struct btrfs_pending_snapshot {
 114         struct dentry *dentry;
 115         struct inode *dir;
 116         struct btrfs_root *root;
 117         struct btrfs_root *snap;
 118         struct btrfs_qgroup_inherit *inherit;
 119         /* block reservation for the operation */
 120         struct btrfs_block_rsv block_rsv;
 121         u64 qgroup_reserved;
 122         /* extra metadata reseration for relocation */
 123         int error;
 124         bool readonly;
 125         struct list_head list;
 126 };
 127
 128 static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
 129                                               struct inode *inode)
 130 {
 131         BTRFS_I(inode)->last_trans = trans->transaction->transid;
 132         BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 133         BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 134 }
 135
 136 int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 137                           struct btrfs_root *root);
 138 struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 139                                                    int num_items);
 140 struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 141                                         struct btrfs_root *root, int num_items);
 142 struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 143 struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 144 struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 145 struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
 146                                         struct btrfs_root *root);
 147 struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 148 int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 149 int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 150                                      struct btrfs_root *root);
 151
 152 void btrfs_add_dead_root(struct btrfs_root *root);
 153 int btrfs_defrag_root(struct btrfs_root *root);
 154 int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
 155 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 156                              struct btrfs_root *root);
 157 int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 158                                    struct btrfs_root *root,
 159                                    int wait_for_unblock);
 160 int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 161                                    struct btrfs_root *root);
 162 int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 163                                  struct btrfs_root *root);
 164 void btrfs_throttle(struct btrfs_root *root);
 165 int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 166                                 struct btrfs_root *root);
 167 int btrfs_write_marked_extents(struct btrfs_root *root,
 168                                 struct extent_io_tree *dirty_pages, int mark);
 169 int btrfs_wait_marked_extents(struct btrfs_root *root,
 170                                 struct extent_io_tree *dirty_pages, int mark);
 171 int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 172 int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 173 void btrfs_put_transaction(struct btrfs_transaction *transaction);
 174 #endif