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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 task_struct *xa_task;
68 struct list_head xa_ail;
69 xfs_lsn_t xa_target;
70 xfs_lsn_t xa_target_prev;
71 struct list_head xa_cursors;
72 spinlock_t xa_lock;
73 xfs_lsn_t xa_last_pushed_lsn;
74 int xa_log_flush;
75 struct list_head xa_buf_list;
76 wait_queue_head_t xa_empty;
77};
78
79/*
80 * From xfs_trans_ail.c
81 */
82void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
83 struct xfs_ail_cursor *cur,
84 struct xfs_log_item **log_items, int nr_items,
85 xfs_lsn_t lsn) __releases(ailp->xa_lock);
86static inline void
87xfs_trans_ail_update(
88 struct xfs_ail *ailp,
89 struct xfs_log_item *lip,
90 xfs_lsn_t lsn) __releases(ailp->xa_lock)
91{
92 xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
93}
94
95void xfs_trans_ail_delete_bulk(struct xfs_ail *ailp,
96 struct xfs_log_item **log_items, int nr_items,
97 int shutdown_type)
98 __releases(ailp->xa_lock);
99static inline void
100xfs_trans_ail_delete(
101 struct xfs_ail *ailp,
102 xfs_log_item_t *lip,
103 int shutdown_type) __releases(ailp->xa_lock)
104{
105 xfs_trans_ail_delete_bulk(ailp, &lip, 1, shutdown_type);
106}
107
108void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
109void xfs_ail_push_all(struct xfs_ail *);
110void xfs_ail_push_all_sync(struct xfs_ail *);
111struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp);
112xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
113
114struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
115 struct xfs_ail_cursor *cur,
116 xfs_lsn_t lsn);
117struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
118 struct xfs_ail_cursor *cur,
119 xfs_lsn_t lsn);
120struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
121 struct xfs_ail_cursor *cur);
122void xfs_trans_ail_cursor_done(struct xfs_ail *ailp,
123 struct xfs_ail_cursor *cur);
124
125#if BITS_PER_LONG != 64
126static inline void
127xfs_trans_ail_copy_lsn(
128 struct xfs_ail *ailp,
129 xfs_lsn_t *dst,
130 xfs_lsn_t *src)
131{
132 ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
133 spin_lock(&ailp->xa_lock);
134 *dst = *src;
135 spin_unlock(&ailp->xa_lock);
136}
137#else
138static inline void
139xfs_trans_ail_copy_lsn(
140 struct xfs_ail *ailp,
141 xfs_lsn_t *dst,
142 xfs_lsn_t *src)
143{
144 ASSERT(sizeof(xfs_lsn_t) == 8);
145 *dst = *src;
146}
147#endif
148#endif /* __XFS_TRANS_PRIV_H__ */