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Linux kernel mirror (for testing)
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1/*
2 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18#ifndef __XFS_TRANS_PRIV_H__
19#define __XFS_TRANS_PRIV_H__
20
21struct xfs_log_item;
22struct xfs_log_item_desc;
23struct xfs_mount;
24struct xfs_trans;
25struct xfs_ail;
26struct xfs_log_vec;
27
28void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
29void xfs_trans_del_item(struct xfs_log_item *);
30void xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
31 int flags);
32void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
33
34void xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
35 xfs_lsn_t commit_lsn, int aborted);
36/*
37 * AIL traversal cursor.
38 *
39 * Rather than using a generation number for detecting changes in the ail, use
40 * a cursor that is protected by the ail lock. The aild cursor exists in the
41 * struct xfs_ail, but other traversals can declare it on the stack and link it
42 * to the ail list.
43 *
44 * When an object is deleted from or moved int the AIL, the cursor list is
45 * searched to see if the object is a designated cursor item. If it is, it is
46 * deleted from the cursor so that the next time the cursor is used traversal
47 * will return to the start.
48 *
49 * This means a traversal colliding with a removal will cause a restart of the
50 * list scan, rather than any insertion or deletion anywhere in the list. The
51 * low bit of the item pointer is set if the cursor has been invalidated so
52 * that we can tell the difference between invalidation and reaching the end
53 * of the list to trigger traversal restarts.
54 */
55struct xfs_ail_cursor {
56 struct list_head list;
57 struct xfs_log_item *item;
58};
59
60/*
61 * Private AIL structures.
62 *
63 * Eventually we need to drive the locking in here as well.
64 */
65struct xfs_ail {
66 struct xfs_mount *xa_mount;
67 struct list_head xa_ail;
68 xfs_lsn_t xa_target;
69 struct list_head xa_cursors;
70 spinlock_t xa_lock;
71 struct delayed_work xa_work;
72 xfs_lsn_t xa_last_pushed_lsn;
73 unsigned long xa_flags;
74};
75
76#define XFS_AIL_PUSHING_BIT 0
77
78/*
79 * From xfs_trans_ail.c
80 */
81
82extern struct workqueue_struct *xfs_ail_wq; /* AIL workqueue */
83
84void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
85 struct xfs_ail_cursor *cur,
86 struct xfs_log_item **log_items, int nr_items,
87 xfs_lsn_t lsn) __releases(ailp->xa_lock);
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->xa_lock)
93{
94 xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
95}
96
97void xfs_trans_ail_delete_bulk(struct xfs_ail *ailp,
98 struct xfs_log_item **log_items, int nr_items)
99 __releases(ailp->xa_lock);
100static inline void
101xfs_trans_ail_delete(
102 struct xfs_ail *ailp,
103 xfs_log_item_t *lip) __releases(ailp->xa_lock)
104{
105 xfs_trans_ail_delete_bulk(ailp, &lip, 1);
106}
107
108void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
109void xfs_ail_push_all(struct xfs_ail *);
110xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
111
112void xfs_trans_unlocked_item(struct xfs_ail *,
113 xfs_log_item_t *);
114
115struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
116 struct xfs_ail_cursor *cur,
117 xfs_lsn_t lsn);
118struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
119 struct xfs_ail_cursor *cur,
120 xfs_lsn_t lsn);
121struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
122 struct xfs_ail_cursor *cur);
123void xfs_trans_ail_cursor_done(struct xfs_ail *ailp,
124 struct xfs_ail_cursor *cur);
125
126#if BITS_PER_LONG != 64
127static inline void
128xfs_trans_ail_copy_lsn(
129 struct xfs_ail *ailp,
130 xfs_lsn_t *dst,
131 xfs_lsn_t *src)
132{
133 ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
134 spin_lock(&ailp->xa_lock);
135 *dst = *src;
136 spin_unlock(&ailp->xa_lock);
137}
138#else
139static inline void
140xfs_trans_ail_copy_lsn(
141 struct xfs_ail *ailp,
142 xfs_lsn_t *dst,
143 xfs_lsn_t *src)
144{
145 ASSERT(sizeof(xfs_lsn_t) == 8);
146 *dst = *src;
147}
148#endif
149#endif /* __XFS_TRANS_PRIV_H__ */