| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) 2007 Oracle. All rights reserved. |
| */ |
| |
| #ifndef BTRFS_TRANSACTION_H |
| #define BTRFS_TRANSACTION_H |
| |
| #include <linux/refcount.h> |
| #include "btrfs_inode.h" |
| #include "delayed-ref.h" |
| #include "ctree.h" |
| |
| enum btrfs_trans_state { |
| TRANS_STATE_RUNNING, |
| TRANS_STATE_COMMIT_START, |
| TRANS_STATE_COMMIT_DOING, |
| TRANS_STATE_UNBLOCKED, |
| TRANS_STATE_COMPLETED, |
| TRANS_STATE_MAX, |
| }; |
| |
| #define BTRFS_TRANS_HAVE_FREE_BGS 0 |
| #define BTRFS_TRANS_DIRTY_BG_RUN 1 |
| #define BTRFS_TRANS_CACHE_ENOSPC 2 |
| |
| 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; |
| refcount_t use_count; |
| |
| unsigned long flags; |
| |
| /* Be protected by fs_info->trans_lock when we want to change it. */ |
| enum btrfs_trans_state state; |
| int aborted; |
| struct list_head list; |
| struct extent_io_tree dirty_pages; |
| time64_t start_time; |
| wait_queue_head_t writer_wait; |
| wait_queue_head_t commit_wait; |
| struct list_head pending_snapshots; |
| struct list_head dev_update_list; |
| struct list_head switch_commits; |
| struct list_head dirty_bgs; |
| |
| /* |
| * There is no explicit lock which protects io_bgs, rather its |
| * consistency is implied by the fact that all the sites which modify |
| * it do so under some form of transaction critical section, namely: |
| * |
| * - btrfs_start_dirty_block_groups - This function can only ever be |
| * run by one of the transaction committers. Refer to |
| * BTRFS_TRANS_DIRTY_BG_RUN usage in btrfs_commit_transaction |
| * |
| * - btrfs_write_dirty_blockgroups - this is called by |
| * commit_cowonly_roots from transaction critical section |
| * (TRANS_STATE_COMMIT_DOING) |
| * |
| * - btrfs_cleanup_dirty_bgs - called on transaction abort |
| */ |
| struct list_head io_bgs; |
| struct list_head dropped_roots; |
| struct extent_io_tree pinned_extents; |
| |
| /* |
| * 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; |
| /* Protected by spin lock fs_info->unused_bgs_lock. */ |
| struct list_head deleted_bgs; |
| spinlock_t dropped_roots_lock; |
| struct btrfs_delayed_ref_root delayed_refs; |
| struct btrfs_fs_info *fs_info; |
| }; |
| |
| #define __TRANS_FREEZABLE (1U << 0) |
| |
| #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_JOIN_NOSTART (1U << 14) |
| |
| #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_JOIN_NOSTART (__TRANS_JOIN_NOSTART) |
| |
| #define TRANS_EXTWRITERS (__TRANS_START | __TRANS_ATTACH) |
| |
| #define BTRFS_SEND_TRANS_STUB ((void *)1) |
| |
| struct btrfs_trans_handle { |
| u64 transid; |
| u64 bytes_reserved; |
| u64 chunk_bytes_reserved; |
| unsigned long delayed_ref_updates; |
| struct btrfs_transaction *transaction; |
| struct btrfs_block_rsv *block_rsv; |
| struct btrfs_block_rsv *orig_rsv; |
| refcount_t use_count; |
| unsigned int type; |
| /* |
| * Error code of transaction abort, set outside of locks and must use |
| * the READ_ONCE/WRITE_ONCE access |
| */ |
| short aborted; |
| bool adding_csums; |
| bool allocating_chunk; |
| bool can_flush_pending_bgs; |
| bool reloc_reserved; |
| bool dirty; |
| struct btrfs_root *root; |
| struct btrfs_fs_info *fs_info; |
| struct list_head new_bgs; |
| }; |
| |
| /* |
| * The abort status can be changed between calls and is not protected by locks. |
| * This accepts btrfs_transaction and btrfs_trans_handle as types. Once it's |
| * set to a non-zero value it does not change, so the macro should be in checks |
| * but is not necessary for further reads of the value. |
| */ |
| #define TRANS_ABORTED(trans) (unlikely(READ_ONCE((trans)->aborted))) |
| |
| struct btrfs_pending_snapshot { |
| struct dentry *dentry; |
| struct inode *dir; |
| struct btrfs_root *root; |
| struct btrfs_root_item *root_item; |
| struct btrfs_root *snap; |
| struct btrfs_qgroup_inherit *inherit; |
| struct btrfs_path *path; |
| /* block reservation for the operation */ |
| struct btrfs_block_rsv block_rsv; |
| /* extra metadata reservation for relocation */ |
| int error; |
| /* Preallocated anonymous block device number */ |
| dev_t anon_dev; |
| bool readonly; |
| struct list_head list; |
| }; |
| |
| static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans, |
| struct btrfs_inode *inode) |
| { |
| spin_lock(&inode->lock); |
| inode->last_trans = trans->transaction->transid; |
| inode->last_sub_trans = inode->root->log_transid; |
| inode->last_log_commit = inode->root->last_log_commit; |
| spin_unlock(&inode->lock); |
| } |
| |
| /* |
| * Make qgroup codes to skip given qgroupid, means the old/new_roots for |
| * qgroup won't contain the qgroupid in it. |
| */ |
| static inline void btrfs_set_skip_qgroup(struct btrfs_trans_handle *trans, |
| u64 qgroupid) |
| { |
| struct btrfs_delayed_ref_root *delayed_refs; |
| |
| delayed_refs = &trans->transaction->delayed_refs; |
| WARN_ON(delayed_refs->qgroup_to_skip); |
| delayed_refs->qgroup_to_skip = qgroupid; |
| } |
| |
| static inline void btrfs_clear_skip_qgroup(struct btrfs_trans_handle *trans) |
| { |
| struct btrfs_delayed_ref_root *delayed_refs; |
| |
| delayed_refs = &trans->transaction->delayed_refs; |
| WARN_ON(!delayed_refs->qgroup_to_skip); |
| delayed_refs->qgroup_to_skip = 0; |
| } |
| |
| int btrfs_end_transaction(struct btrfs_trans_handle *trans); |
| struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
| unsigned int num_items); |
| struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv( |
| struct btrfs_root *root, |
| unsigned int num_items); |
| struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root); |
| struct btrfs_trans_handle *btrfs_join_transaction_spacecache(struct btrfs_root *root); |
| struct btrfs_trans_handle *btrfs_join_transaction_nostart(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); |
| int btrfs_wait_for_commit(struct btrfs_fs_info *fs_info, 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); |
| int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, |
| int wait_for_unblock); |
| |
| /* |
| * Try to commit transaction asynchronously, so this is safe to call |
| * even holding a spinlock. |
| * |
| * It's done by informing transaction_kthread to commit transaction without |
| * waiting for commit interval. |
| */ |
| static inline void btrfs_commit_transaction_locksafe( |
| struct btrfs_fs_info *fs_info) |
| { |
| set_bit(BTRFS_FS_NEED_ASYNC_COMMIT, &fs_info->flags); |
| wake_up_process(fs_info->transaction_kthread); |
| } |
| int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans); |
| int btrfs_should_end_transaction(struct btrfs_trans_handle *trans); |
| void btrfs_throttle(struct btrfs_fs_info *fs_info); |
| int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| int btrfs_write_marked_extents(struct btrfs_fs_info *fs_info, |
| struct extent_io_tree *dirty_pages, int mark); |
| int btrfs_wait_tree_log_extents(struct btrfs_root *root, 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); |
| void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, |
| struct btrfs_root *root); |
| void btrfs_trans_release_chunk_metadata(struct btrfs_trans_handle *trans); |
| |
| #endif |