227 lines
7.6 KiB
C
227 lines
7.6 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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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 "kerncompat.h"
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#include <sys/stat.h>
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#include <errno.h>
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#include <stdbool.h>
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#include "kernel-lib/list.h"
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#include "kernel-lib/bitops.h"
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#include "kernel-shared/delayed-ref.h"
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#include "kernel-shared/extent-io-tree.h"
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#include "kernel-shared/misc.h"
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struct btrfs_fs_info;
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struct btrfs_root;
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enum btrfs_trans_state {
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TRANS_STATE_RUNNING,
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TRANS_STATE_COMMIT_PREP,
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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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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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};
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enum {
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ENUM_BIT(__TRANS_FREEZABLE),
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ENUM_BIT(__TRANS_START),
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ENUM_BIT(__TRANS_ATTACH),
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ENUM_BIT(__TRANS_JOIN),
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ENUM_BIT(__TRANS_JOIN_NOLOCK),
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ENUM_BIT(__TRANS_DUMMY),
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ENUM_BIT(__TRANS_JOIN_NOSTART),
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};
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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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struct btrfs_fs_info *fs_info;
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u64 transid;
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u64 alloc_exclude_start;
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u64 alloc_exclude_nr;
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bool reinit_extent_tree;
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unsigned int allocating_chunk:1;
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u64 delayed_ref_updates;
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unsigned long blocks_reserved;
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unsigned long blocks_used;
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struct btrfs_block_group *block_group;
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struct btrfs_delayed_ref_root delayed_refs;
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struct list_head dirty_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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/* 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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bool __cold abort_should_print_stack(int error);
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void btrfs_abort_transaction(struct btrfs_trans_handle *trans, int error);
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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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struct btrfs_root *root);
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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_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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void __cold __btrfs_abort_transaction(struct btrfs_trans_handle *trans,
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const char *function,
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unsigned int line, int error, bool first_hit);
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int __init btrfs_transaction_init(void);
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void __cold btrfs_transaction_exit(void);
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int __commit_transaction(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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int commit_tree_roots(struct btrfs_trans_handle *trans,
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struct btrfs_fs_info *fs_info);
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#endif
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