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
  35#define BTRFS_TRANS_HAVE_FREE_BGS       0
  36#define BTRFS_TRANS_DIRTY_BG_RUN        1
  37#define BTRFS_TRANS_CACHE_ENOSPC        2
  38
  39struct btrfs_transaction {
  40        u64 transid;
  41        /*
  42         * total external writers(USERSPACE/START/ATTACH) in this
  43         * transaction, it must be zero before the transaction is
  44         * being committed
  45         */
  46        atomic_t num_extwriters;
  47        /*
  48         * total writers in this transaction, it must be zero before the
  49         * transaction can end
  50         */
  51        atomic_t num_writers;
  52        atomic_t use_count;
  53        atomic_t pending_ordered;
  54
  55        unsigned long flags;
  56
  57        /* Be protected by fs_info->trans_lock when we want to change it. */
  58        enum btrfs_trans_state state;
  59        struct list_head list;
  60        struct extent_io_tree dirty_pages;
  61        unsigned long start_time;
  62        wait_queue_head_t writer_wait;
  63        wait_queue_head_t commit_wait;
  64        wait_queue_head_t pending_wait;
  65        struct list_head pending_snapshots;
  66        struct list_head pending_chunks;
  67        struct list_head switch_commits;
  68        struct list_head dirty_bgs;
  69        struct list_head io_bgs;
  70        struct list_head dropped_roots;
  71        u64 num_dirty_bgs;
  72
  73        /*
  74         * we need to make sure block group deletion doesn't race with
  75         * free space cache writeout.  This mutex keeps them from stomping
  76         * on each other
  77         */
  78        struct mutex cache_write_mutex;
  79        spinlock_t dirty_bgs_lock;
  80        /* Protected by spin lock fs_info->unused_bgs_lock. */
  81        struct list_head deleted_bgs;
  82        spinlock_t dropped_roots_lock;
  83        struct btrfs_delayed_ref_root delayed_refs;
  84        int aborted;
  85};
  86
  87#define __TRANS_FREEZABLE       (1U << 0)
  88
  89#define __TRANS_USERSPACE       (1U << 8)
  90#define __TRANS_START           (1U << 9)
  91#define __TRANS_ATTACH          (1U << 10)
  92#define __TRANS_JOIN            (1U << 11)
  93#define __TRANS_JOIN_NOLOCK     (1U << 12)
  94#define __TRANS_DUMMY           (1U << 13)
  95
  96#define TRANS_USERSPACE         (__TRANS_USERSPACE | __TRANS_FREEZABLE)
  97#define TRANS_START             (__TRANS_START | __TRANS_FREEZABLE)
  98#define TRANS_ATTACH            (__TRANS_ATTACH)
  99#define TRANS_JOIN              (__TRANS_JOIN | __TRANS_FREEZABLE)
 100#define TRANS_JOIN_NOLOCK       (__TRANS_JOIN_NOLOCK)
 101
 102#define TRANS_EXTWRITERS        (__TRANS_USERSPACE | __TRANS_START |    \
 103                                 __TRANS_ATTACH)
 104
 105#define BTRFS_SEND_TRANS_STUB   ((void *)1)
 106
 107struct btrfs_trans_handle {
 108        u64 transid;
 109        u64 bytes_reserved;
 110        u64 chunk_bytes_reserved;
 111        unsigned long use_count;
 112        unsigned long blocks_reserved;
 113        unsigned long delayed_ref_updates;
 114        struct btrfs_transaction *transaction;
 115        struct btrfs_block_rsv *block_rsv;
 116        struct btrfs_block_rsv *orig_rsv;
 117        short aborted;
 118        short adding_csums;
 119        bool allocating_chunk;
 120        bool can_flush_pending_bgs;
 121        bool reloc_reserved;
 122        bool sync;
 123        bool dirty;
 124        unsigned int type;
 125        /*
 126         * this root is only needed to validate that the root passed to
 127         * start_transaction is the same as the one passed to end_transaction.
 128         * Subvolume quota depends on this
 129         */
 130        struct btrfs_root *root;
 131        struct btrfs_fs_info *fs_info;
 132        struct seq_list delayed_ref_elem;
 133        struct list_head qgroup_ref_list;
 134        struct list_head new_bgs;
 135};
 136
 137struct btrfs_pending_snapshot {
 138        struct dentry *dentry;
 139        struct inode *dir;
 140        struct btrfs_root *root;
 141        struct btrfs_root_item *root_item;
 142        struct btrfs_root *snap;
 143        struct btrfs_qgroup_inherit *inherit;
 144        struct btrfs_path *path;
 145        /* block reservation for the operation */
 146        struct btrfs_block_rsv block_rsv;
 147        u64 qgroup_reserved;
 148        /* extra metadata reservation for relocation */
 149        int error;
 150        bool readonly;
 151        struct list_head list;
 152};
 153
 154static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
 155                                              struct inode *inode)
 156{
 157        spin_lock(&BTRFS_I(inode)->lock);
 158        BTRFS_I(inode)->last_trans = trans->transaction->transid;
 159        BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid;
 160        BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit;
 161        spin_unlock(&BTRFS_I(inode)->lock);
 162}
 163
 164/*
 165 * Make qgroup codes to skip given qgroupid, means the old/new_roots for
 166 * qgroup won't contain the qgroupid in it.
 167 */
 168static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
 169                                         u64 qgroupid)
 170{
 171        struct btrfs_delayed_ref_root *delayed_refs;
 172
 173        delayed_refs = &trans->transaction->delayed_refs;
 174        WARN_ON(delayed_refs->qgroup_to_skip);
 175        delayed_refs->qgroup_to_skip = qgroupid;
 176}
 177
 178static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
 179{
 180        struct btrfs_delayed_ref_root *delayed_refs;
 181
 182        delayed_refs = &trans->transaction->delayed_refs;
 183        WARN_ON(!delayed_refs->qgroup_to_skip);
 184        delayed_refs->qgroup_to_skip = 0;
 185}
 186
 187int btrfs_end_transaction(struct btrfs_trans_handle *trans,
 188                          struct btrfs_root *root);
 189struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
 190                                                   unsigned int num_items);
 191struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
 192                                        struct btrfs_root *root,
 193                                        unsigned int num_items,
 194                                        int min_factor);
 195struct btrfs_trans_handle *btrfs_start_transaction_lflush(
 196                                        struct btrfs_root *root,
 197                                        unsigned int num_items);
 198struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
 199struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root);
 200struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
 201struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
 202                                        struct btrfs_root *root);
 203struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root);
 204int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid);
 205
 206void btrfs_add_dead_root(struct btrfs_root *root);
 207int btrfs_defrag_root(struct btrfs_root *root);
 208int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root);
 209int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 210                             struct btrfs_root *root);
 211int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans,
 212                                   struct btrfs_root *root,
 213                                   int wait_for_unblock);
 214int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans,
 215                                   struct btrfs_root *root);
 216int btrfs_should_end_transaction(struct btrfs_trans_handle *trans,
 217                                 struct btrfs_root *root);
 218void btrfs_throttle(struct btrfs_root *root);
 219int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
 220                                struct btrfs_root *root);
 221int btrfs_write_marked_extents(struct btrfs_root *root,
 222                                struct extent_io_tree *dirty_pages, int mark);
 223int btrfs_wait_marked_extents(struct btrfs_root *root,
 224                                struct extent_io_tree *dirty_pages, int mark);
 225int btrfs_transaction_blocked(struct btrfs_fs_info *info);
 226int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
 227void btrfs_put_transaction(struct btrfs_transaction *transaction);
 228void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
 229void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
 230                            struct btrfs_root *root);
 231#endif
 232