240 lines
7.7 KiB
C
240 lines
7.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*/
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#ifndef BTRFS_TRANSACTION_H
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#define BTRFS_TRANSACTION_H
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#include <linux/refcount.h>
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#include "btrfs_inode.h"
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#include "delayed-ref.h"
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#include "ctree.h"
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enum btrfs_trans_state {
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TRANS_STATE_RUNNING,
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TRANS_STATE_COMMIT_START,
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TRANS_STATE_COMMIT_DOING,
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TRANS_STATE_UNBLOCKED,
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TRANS_STATE_SUPER_COMMITTED,
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TRANS_STATE_COMPLETED,
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TRANS_STATE_MAX,
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};
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#define BTRFS_TRANS_HAVE_FREE_BGS 0
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#define BTRFS_TRANS_DIRTY_BG_RUN 1
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#define BTRFS_TRANS_CACHE_ENOSPC 2
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struct btrfs_transaction {
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u64 transid;
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/*
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* total external writers(USERSPACE/START/ATTACH) in this
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* transaction, it must be zero before the transaction is
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* being committed
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*/
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atomic_t num_extwriters;
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/*
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* total writers in this transaction, it must be zero before the
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* transaction can end
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*/
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atomic_t num_writers;
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refcount_t use_count;
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unsigned long flags;
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/* Be protected by fs_info->trans_lock when we want to change it. */
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enum btrfs_trans_state state;
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int aborted;
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struct list_head list;
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struct extent_io_tree dirty_pages;
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time64_t start_time;
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wait_queue_head_t writer_wait;
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wait_queue_head_t commit_wait;
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struct list_head pending_snapshots;
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struct list_head dev_update_list;
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struct list_head switch_commits;
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struct list_head dirty_bgs;
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/*
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* There is no explicit lock which protects io_bgs, rather its
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* consistency is implied by the fact that all the sites which modify
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* it do so under some form of transaction critical section, namely:
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*
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* - btrfs_start_dirty_block_groups - This function can only ever be
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* run by one of the transaction committers. Refer to
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* BTRFS_TRANS_DIRTY_BG_RUN usage in btrfs_commit_transaction
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*
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* - btrfs_write_dirty_blockgroups - this is called by
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* commit_cowonly_roots from transaction critical section
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* (TRANS_STATE_COMMIT_DOING)
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*
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* - btrfs_cleanup_dirty_bgs - called on transaction abort
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*/
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struct list_head io_bgs;
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struct list_head dropped_roots;
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struct extent_io_tree pinned_extents;
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/*
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* we need to make sure block group deletion doesn't race with
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* free space cache writeout. This mutex keeps them from stomping
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* on each other
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*/
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struct mutex cache_write_mutex;
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spinlock_t dirty_bgs_lock;
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/* Protected by spin lock fs_info->unused_bgs_lock. */
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struct list_head deleted_bgs;
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spinlock_t dropped_roots_lock;
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struct btrfs_delayed_ref_root delayed_refs;
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struct btrfs_fs_info *fs_info;
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/*
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* Number of ordered extents the transaction must wait for before
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* committing. These are ordered extents started by a fast fsync.
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*/
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atomic_t pending_ordered;
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wait_queue_head_t pending_wait;
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spinlock_t releasing_ebs_lock;
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struct list_head releasing_ebs;
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};
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#define __TRANS_FREEZABLE (1U << 0)
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#define __TRANS_START (1U << 9)
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#define __TRANS_ATTACH (1U << 10)
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#define __TRANS_JOIN (1U << 11)
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#define __TRANS_JOIN_NOLOCK (1U << 12)
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#define __TRANS_DUMMY (1U << 13)
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#define __TRANS_JOIN_NOSTART (1U << 14)
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#define TRANS_START (__TRANS_START | __TRANS_FREEZABLE)
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#define TRANS_ATTACH (__TRANS_ATTACH)
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#define TRANS_JOIN (__TRANS_JOIN | __TRANS_FREEZABLE)
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#define TRANS_JOIN_NOLOCK (__TRANS_JOIN_NOLOCK)
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#define TRANS_JOIN_NOSTART (__TRANS_JOIN_NOSTART)
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#define TRANS_EXTWRITERS (__TRANS_START | __TRANS_ATTACH)
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struct btrfs_trans_handle {
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u64 transid;
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u64 bytes_reserved;
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u64 chunk_bytes_reserved;
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unsigned long delayed_ref_updates;
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struct btrfs_transaction *transaction;
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struct btrfs_block_rsv *block_rsv;
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struct btrfs_block_rsv *orig_rsv;
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/* Set by a task that wants to create a snapshot. */
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struct btrfs_pending_snapshot *pending_snapshot;
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refcount_t use_count;
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unsigned int type;
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/*
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* Error code of transaction abort, set outside of locks and must use
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* the READ_ONCE/WRITE_ONCE access
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*/
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short aborted;
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bool adding_csums;
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bool allocating_chunk;
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bool removing_chunk;
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bool reloc_reserved;
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bool in_fsync;
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struct btrfs_fs_info *fs_info;
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struct list_head new_bgs;
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};
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/*
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* The abort status can be changed between calls and is not protected by locks.
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* This accepts btrfs_transaction and btrfs_trans_handle as types. Once it's
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* set to a non-zero value it does not change, so the macro should be in checks
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* but is not necessary for further reads of the value.
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*/
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#define TRANS_ABORTED(trans) (unlikely(READ_ONCE((trans)->aborted)))
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struct btrfs_pending_snapshot {
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struct dentry *dentry;
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struct inode *dir;
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struct btrfs_root *root;
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struct btrfs_root_item *root_item;
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struct btrfs_root *snap;
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struct btrfs_qgroup_inherit *inherit;
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struct btrfs_path *path;
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/* block reservation for the operation */
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struct btrfs_block_rsv block_rsv;
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/* extra metadata reservation for relocation */
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int error;
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/* Preallocated anonymous block device number */
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dev_t anon_dev;
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bool readonly;
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struct list_head list;
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};
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static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
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struct btrfs_inode *inode)
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{
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spin_lock(&inode->lock);
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inode->last_trans = trans->transaction->transid;
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inode->last_sub_trans = inode->root->log_transid;
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inode->last_log_commit = inode->last_sub_trans - 1;
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spin_unlock(&inode->lock);
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}
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/*
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* Make qgroup codes to skip given qgroupid, means the old/new_roots for
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* qgroup won't contain the qgroupid in it.
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*/
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static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans,
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u64 qgroupid)
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{
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struct btrfs_delayed_ref_root *delayed_refs;
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delayed_refs = &trans->transaction->delayed_refs;
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WARN_ON(delayed_refs->qgroup_to_skip);
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delayed_refs->qgroup_to_skip = qgroupid;
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}
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static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans)
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{
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struct btrfs_delayed_ref_root *delayed_refs;
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delayed_refs = &trans->transaction->delayed_refs;
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WARN_ON(!delayed_refs->qgroup_to_skip);
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delayed_refs->qgroup_to_skip = 0;
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}
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int btrfs_end_transaction(struct btrfs_trans_handle *trans);
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struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
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unsigned int num_items);
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struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv(
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struct btrfs_root *root,
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unsigned int num_items);
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struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root);
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struct btrfs_trans_handle *btrfs_join_transaction_spacecache(struct btrfs_root *root);
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struct btrfs_trans_handle *btrfs_join_transaction_nostart(struct btrfs_root *root);
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struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root);
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struct btrfs_trans_handle *btrfs_attach_transaction_barrier(
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struct btrfs_root *root);
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int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, u64 transid);
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void btrfs_add_dead_root(struct btrfs_root *root);
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int btrfs_defrag_root(struct btrfs_root *root);
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void btrfs_maybe_wake_unfinished_drop(struct btrfs_fs_info *fs_info);
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int btrfs_clean_one_deleted_snapshot(struct btrfs_fs_info *fs_info);
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int btrfs_commit_transaction(struct btrfs_trans_handle *trans);
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void btrfs_commit_transaction_async(struct btrfs_trans_handle *trans);
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int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans);
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bool btrfs_should_end_transaction(struct btrfs_trans_handle *trans);
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void btrfs_throttle(struct btrfs_fs_info *fs_info);
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int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info,
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struct extent_io_tree *dirty_pages, int mark);
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int btrfs_wait_tree_log_extents(struct btrfs_root *root, int mark);
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int btrfs_transaction_blocked(struct btrfs_fs_info *info);
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int btrfs_transaction_in_commit(struct btrfs_fs_info *info);
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void btrfs_put_transaction(struct btrfs_transaction *transaction);
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void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info);
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void btrfs_add_dropped_root(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans);
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#endif
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