1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#ifndef __XFS_TRANS_PRIV_H__
7#define __XFS_TRANS_PRIV_H__
8
9struct xlog;
10struct xfs_log_item;
11struct xfs_mount;
12struct xfs_trans;
13struct xfs_ail;
14struct xfs_log_vec;
15
16
17void xfs_trans_init(struct xfs_mount *);
18void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
19void xfs_trans_del_item(struct xfs_log_item *);
20void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
21
22/*
23 * AIL traversal cursor.
24 *
25 * Rather than using a generation number for detecting changes in the ail, use
26 * a cursor that is protected by the ail lock. The aild cursor exists in the
27 * struct xfs_ail, but other traversals can declare it on the stack and link it
28 * to the ail list.
29 *
30 * When an object is deleted from or moved int the AIL, the cursor list is
31 * searched to see if the object is a designated cursor item. If it is, it is
32 * deleted from the cursor so that the next time the cursor is used traversal
33 * will return to the start.
34 *
35 * This means a traversal colliding with a removal will cause a restart of the
36 * list scan, rather than any insertion or deletion anywhere in the list. The
37 * low bit of the item pointer is set if the cursor has been invalidated so
38 * that we can tell the difference between invalidation and reaching the end
39 * of the list to trigger traversal restarts.
40 */
41struct xfs_ail_cursor {
42 struct list_head list;
43 struct xfs_log_item *item;
44};
45
46/*
47 * Private AIL structures.
48 *
49 * Eventually we need to drive the locking in here as well.
50 */
51struct xfs_ail {
52 struct xlog *ail_log;
53 struct task_struct *ail_task;
54 struct list_head ail_head;
55 struct list_head ail_cursors;
56 spinlock_t ail_lock;
57 xfs_lsn_t ail_last_pushed_lsn;
58 xfs_lsn_t ail_head_lsn;
59 int ail_log_flush;
60 unsigned long ail_opstate;
61 struct list_head ail_buf_list;
62 wait_queue_head_t ail_empty;
63 xfs_lsn_t ail_target;
64};
65
66/* Push all items out of the AIL immediately. */
67#define XFS_AIL_OPSTATE_PUSH_ALL 0u
68
69/*
70 * From xfs_trans_ail.c
71 */
72void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
73 struct xfs_ail_cursor *cur,
74 struct xfs_log_item **log_items, int nr_items,
75 xfs_lsn_t lsn) __releases(ailp->ail_lock);
76/*
77 * Return a pointer to the first item in the AIL. If the AIL is empty, then
78 * return NULL.
79 */
80static inline struct xfs_log_item *
81xfs_ail_min(
82 struct xfs_ail *ailp)
83{
84 return list_first_entry_or_null(&ailp->ail_head, struct xfs_log_item,
85 li_ail);
86}
87
88static inline void
89xfs_trans_ail_update(
90 struct xfs_ail *ailp,
91 struct xfs_log_item *lip,
92 xfs_lsn_t lsn) __releases(ailp->ail_lock)
93{
94 xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
95}
96
97void xfs_trans_ail_insert(struct xfs_ail *ailp, struct xfs_log_item *lip,
98 xfs_lsn_t lsn);
99
100xfs_lsn_t xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip);
101void xfs_ail_update_finish(struct xfs_ail *ailp, xfs_lsn_t old_lsn)
102 __releases(ailp->ail_lock);
103void xfs_trans_ail_delete(struct xfs_log_item *lip, int shutdown_type);
104
105static inline void xfs_ail_push(struct xfs_ail *ailp)
106{
107 wake_up_process(tsk: ailp->ail_task);
108}
109
110static inline void xfs_ail_push_all(struct xfs_ail *ailp)
111{
112 if (!test_and_set_bit(XFS_AIL_OPSTATE_PUSH_ALL, addr: &ailp->ail_opstate))
113 xfs_ail_push(ailp);
114}
115
116static inline xfs_lsn_t xfs_ail_get_push_target(struct xfs_ail *ailp)
117{
118 return READ_ONCE(ailp->ail_target);
119}
120
121void xfs_ail_push_all_sync(struct xfs_ail *ailp);
122xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
123
124struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
125 struct xfs_ail_cursor *cur,
126 xfs_lsn_t lsn);
127struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
128 struct xfs_ail_cursor *cur,
129 xfs_lsn_t lsn);
130struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
131 struct xfs_ail_cursor *cur);
132void xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
133
134void __xfs_ail_assign_tail_lsn(struct xfs_ail *ailp);
135
136static inline void
137xfs_ail_assign_tail_lsn(
138 struct xfs_ail *ailp)
139{
140
141 spin_lock(lock: &ailp->ail_lock);
142 __xfs_ail_assign_tail_lsn(ailp);
143 spin_unlock(lock: &ailp->ail_lock);
144}
145
146#if BITS_PER_LONG != 64
147static inline void
148xfs_trans_ail_copy_lsn(
149 struct xfs_ail *ailp,
150 xfs_lsn_t *dst,
151 xfs_lsn_t *src)
152{
153 ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
154 spin_lock(&ailp->ail_lock);
155 *dst = *src;
156 spin_unlock(&ailp->ail_lock);
157}
158#else
159static inline void
160xfs_trans_ail_copy_lsn(
161 struct xfs_ail *ailp,
162 xfs_lsn_t *dst,
163 xfs_lsn_t *src)
164{
165 ASSERT(sizeof(xfs_lsn_t) == 8);
166 *dst = *src;
167}
168#endif
169
170#endif /* __XFS_TRANS_PRIV_H__ */
171

source code of linux/fs/xfs/xfs_trans_priv.h