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
  25struct btrfs_transaction {
  26        u64 transid;
  27        /*
  28         * total writers in this transaction, it must be zero before the
  29         * transaction can end
  30         */
  31        atomic_t num_writers;
  32        atomic_t use_count;
  33
  34        unsigned long num_joined;
  35
  36        spinlock_t commit_lock;
  37        int in_commit;
  38        int commit_done;
  39        int blocked;
  40        struct list_head list;
  41        struct extent_io_tree dirty_pages;
  42        unsigned long start_time;
  43        wait_queue_head_t writer_wait;
  44        wait_queue_head_t commit_wait;
  45        struct list_head pending_snapshots;
  46        struct btrfs_delayed_ref_root delayed_refs;
  47        int aborted;
  48};
  49
  50enum btrfs_trans_type {
  51        TRANS_START,
  52        TRANS_JOIN,
  53        TRANS_USERSPACE,
  54        TRANS_JOIN_NOLOCK,
  55        TRANS_ATTACH,
  56};
  57
  58struct btrfs_trans_handle {
  59        u64 transid;
  60        u64 bytes_reserved;
  61        u64 qgroup_reserved;
  62        unsigned long use_count;
  63        unsigned long blocks_reserved;
  64        unsigned long blocks_used;
  65        unsigned long delayed_ref_updates;
  66        struct btrfs_transaction *transaction;
  67        struct btrfs_block_rsv *block_rsv;
  68        struct btrfs_block_rsv *orig_rsv;
  69        short aborted;
  70        short adding_csums;
  71        enum btrfs_trans_type type;
  72        /*
  73         * this root is only needed to validate that the root passed to
  74         * start_transaction is the same as the one passed to end_transaction.
  75         * Subvolume quota depends on this
  76         */
  77        struct btrfs_root *root;
  78        struct seq_list delayed_ref_elem;
  79        struct list_head qgroup_ref_list;
  80        struct list_head new_bgs;
  81};
  82
  83struct btrfs_pending_snapshot {
  84        struct dentry *dentry;
  85        struct btrfs_root *root;
  86        struct btrfs_root *snap;
  87        struct btrfs_qgroup_inherit *inherit;
  88        /* block reservation for the operation */
  89        struct btrfs_block_rsv block_rsv;
  90        /* extra metadata reseration for relocation */
  91        int error;
  92        bool readonly;
  93        struct list_head list;
  94};
  95
  96static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
  97                                              struct inode *inode)
  98{
  99        BTRFS_I(inode)->last_trans = trans->transaction->transid;
 100        BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 101        BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 102}
 103
 104int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 105                          struct btrfs_root *root);
 106struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 107                                                   int num_items);
 108struct btrfs_trans_handle *btrfs_start_transaction_noflush(
 109                                        struct btrfs_root *root, int num_items);
 110struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 111struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 112struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 113struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 114int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 115int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
 116                                     struct btrfs_root *root);
 117
 118int btrfs_add_dead_root(struct btrfs_root *root);
 119int btrfs_defrag_root(struct btrfs_root *root, int cacheonly);
 120int btrfs_clean_old_snapshots(struct btrfs_root *root);
 121int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 122                             struct btrfs_root *root);
 123int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 124                                   struct btrfs_root *root,
 125                                   int wait_for_unblock);
 126int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 127                                   struct btrfs_root *root);
 128int btrfs_end_transaction_dmeta(struct btrfs_trans_handle *trans,
 129                                struct btrfs_root *root);
 130int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 131                                 struct btrfs_root *root);
 132void btrfs_throttle(struct btrfs_root *root);
 133int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 134                                struct btrfs_root *root);
 135int btrfs_write_and_wait_marked_extents(struct btrfs_root *root,
 136                                struct extent_io_tree *dirty_pages, int mark);
 137int btrfs_write_marked_extents(struct btrfs_root *root,
 138                                struct extent_io_tree *dirty_pages, int mark);
 139int btrfs_wait_marked_extents(struct btrfs_root *root,
 140                                struct extent_io_tree *dirty_pages, int mark);
 141int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 142int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 143void put_transaction(struct btrfs_transaction *transaction);
 144#endif
 145