LXR linux/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
  25enum 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
  35struct 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
  81struct 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
 107struct 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
 122static 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
 130int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 131                          struct btrfs_root *root);
 132struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 133                                                   int num_items);
 134struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 135                                        struct btrfs_root *root, int num_items);
 136struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 137struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 138struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 139struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
 140                                        struct btrfs_root *root);
 141struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 142int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 143int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 144                                     struct btrfs_root *root);
 145
 146void btrfs_add_dead_root(struct btrfs_root *root);
 147int btrfs_defrag_root(struct btrfs_root *root);
 148int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
 149int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 150                             struct btrfs_root *root);
 151int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 152                                   struct btrfs_root *root,
 153                                   int wait_for_unblock);
 154int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 155                                   struct btrfs_root *root);
 156int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
 157                                struct btrfs_root *root);
 158int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 159                                 struct btrfs_root *root);
 160void btrfs_throttle(struct btrfs_root *root);
 161int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 162                                struct btrfs_root *root);
 163int btrfs_write_marked_extents(struct btrfs_root *root,
 164                                struct extent_io_tree *dirty_pages, int mark);
 165int btrfs_wait_marked_extents(struct btrfs_root *root,
 166                                struct extent_io_tree *dirty_pages, int mark);
 167int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 168int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 169#endif
 170