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Diffstat (limited to 'fs/btrfs/transaction.h')
| -rw-r--r-- | fs/btrfs/transaction.h | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h new file mode 100644 index 000000000..0b2475559 --- /dev/null +++ b/fs/btrfs/transaction.h @@ -0,0 +1,194 @@ +/* + * Copyright (C) 2007 Oracle. All rights reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public + * License v2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public + * License along with this program; if not, write to the + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 021110-1307, USA. + */ + +#ifndef __BTRFS_TRANSACTION__ +#define __BTRFS_TRANSACTION__ +#include "btrfs_inode.h" +#include "delayed-ref.h" +#include "ctree.h" + +enum btrfs_trans_state { + TRANS_STATE_RUNNING = 0, + TRANS_STATE_BLOCKED = 1, + TRANS_STATE_COMMIT_START = 2, + TRANS_STATE_COMMIT_DOING = 3, + TRANS_STATE_UNBLOCKED = 4, + TRANS_STATE_COMPLETED = 5, + TRANS_STATE_MAX = 6, +}; + +struct btrfs_transaction { + u64 transid; + /* + * total external writers(USERSPACE/START/ATTACH) in this + * transaction, it must be zero before the transaction is + * being committed + */ + atomic_t num_extwriters; + /* + * total writers in this transaction, it must be zero before the + * transaction can end + */ + atomic_t num_writers; + atomic_t use_count; + + /* + * true if there is free bgs operations in this transaction + */ + int have_free_bgs; + + /* Be protected by fs_info->trans_lock when we want to change it. */ + enum btrfs_trans_state state; + struct list_head list; + struct extent_io_tree dirty_pages; + unsigned long start_time; + wait_queue_head_t writer_wait; + wait_queue_head_t commit_wait; + struct list_head pending_snapshots; + struct list_head pending_chunks; + struct list_head pending_ordered; + struct list_head switch_commits; + struct list_head dirty_bgs; + struct list_head io_bgs; + u64 num_dirty_bgs; + + /* + * we need to make sure block group deletion doesn't race with + * free space cache writeout. This mutex keeps them from stomping + * on each other + */ + struct mutex cache_write_mutex; + spinlock_t dirty_bgs_lock; + struct btrfs_delayed_ref_root delayed_refs; + int aborted; + int dirty_bg_run; +}; + +#define __TRANS_FREEZABLE (1U << 0) + +#define __TRANS_USERSPACE (1U << 8) +#define __TRANS_START (1U << 9) +#define __TRANS_ATTACH (1U << 10) +#define __TRANS_JOIN (1U << 11) +#define __TRANS_JOIN_NOLOCK (1U << 12) +#define __TRANS_DUMMY (1U << 13) + +#define TRANS_USERSPACE (__TRANS_USERSPACE | __TRANS_FREEZABLE) +#define TRANS_START (__TRANS_START | __TRANS_FREEZABLE) +#define TRANS_ATTACH (__TRANS_ATTACH) +#define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE) +#define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK) + +#define TRANS_EXTWRITERS (__TRANS_USERSPACE | __TRANS_START | \ + __TRANS_ATTACH) + +#define BTRFS_SEND_TRANS_STUB ((void *)1) + +struct btrfs_trans_handle { + u64 transid; + u64 bytes_reserved; + u64 qgroup_reserved; + unsigned long use_count; + unsigned long blocks_reserved; + unsigned long blocks_used; + unsigned long delayed_ref_updates; + struct btrfs_transaction *transaction; + struct btrfs_block_rsv *block_rsv; + struct btrfs_block_rsv *orig_rsv; + short aborted; + short adding_csums; + bool allocating_chunk; + bool reloc_reserved; + bool sync; + unsigned int type; + /* + * this root is only needed to validate that the root passed to + * start_transaction is the same as the one passed to end_transaction. + * Subvolume quota depends on this + */ + struct btrfs_root *root; + struct seq_list delayed_ref_elem; + struct list_head ordered; + struct list_head qgroup_ref_list; + struct list_head new_bgs; +}; + +struct btrfs_pending_snapshot { + struct dentry *dentry; + struct inode *dir; + struct btrfs_root *root; + struct btrfs_root *snap; + struct btrfs_qgroup_inherit *inherit; + /* block reservation for the operation */ + struct btrfs_block_rsv block_rsv; + u64 qgroup_reserved; + /* extra metadata reseration for relocation */ + int error; + bool readonly; + struct list_head list; +}; + +static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, + struct inode *inode) +{ + spin_lock(&BTRFS_I(inode)->lock); + BTRFS_I(inode)->last_trans = trans->transaction->transid; + BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; + BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; + spin_unlock(&BTRFS_I(inode)->lock); +} + +int btrfs_end_transaction(struct btrfs_trans_handle *trans, + struct btrfs_root *root); +struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, + int num_items); +struct btrfs_trans_handle *btrfs_start_transaction_lflush( + struct btrfs_root *root, int num_items); +struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); +struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root); +struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root); +struct btrfs_trans_handle *btrfs_attach_transaction_barrier( + struct btrfs_root *root); +struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root); +int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid); + +void btrfs_add_dead_root(struct btrfs_root *root); +int btrfs_defrag_root(struct btrfs_root *root); +int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root); +int btrfs_commit_transaction(struct btrfs_trans_handle *trans, + struct btrfs_root *root); +int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, + struct btrfs_root *root, + int wait_for_unblock); +int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, + struct btrfs_root *root); +int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, + struct btrfs_root *root); +void btrfs_throttle(struct btrfs_root *root); +int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, + struct btrfs_root *root); +int btrfs_write_marked_extents(struct btrfs_root *root, + struct extent_io_tree *dirty_pages, int mark); +int btrfs_wait_marked_extents(struct btrfs_root *root, + struct extent_io_tree *dirty_pages, int mark); +int btrfs_transaction_blocked(struct btrfs_fs_info *info); +int btrfs_transaction_in_commit(struct btrfs_fs_info *info); +void btrfs_put_transaction(struct btrfs_transaction *transaction); +void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info); + +#endif |