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xfs_trans_priv.h
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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 
21 struct xfs_log_item;
22 struct xfs_log_item_desc;
23 struct xfs_mount;
24 struct xfs_trans;
25 struct xfs_ail;
26 struct xfs_log_vec;
27 
28 void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
29 void xfs_trans_del_item(struct xfs_log_item *);
30 void xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
31  int flags);
32 void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
33 
34 void 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  */
55 struct 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  */
65 struct 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  */
82 void 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);
86 static inline void
87 xfs_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 
95 void 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);
99 static inline void
100 xfs_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 
108 void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
109 void xfs_ail_push_all(struct xfs_ail *);
110 void xfs_ail_push_all_sync(struct xfs_ail *);
111 struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp);
112 xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
113 
114 struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
115  struct xfs_ail_cursor *cur,
116  xfs_lsn_t lsn);
117 struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
118  struct xfs_ail_cursor *cur,
119  xfs_lsn_t lsn);
120 struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
121  struct xfs_ail_cursor *cur);
122 void xfs_trans_ail_cursor_done(struct xfs_ail *ailp,
123  struct xfs_ail_cursor *cur);
124 
125 #if BITS_PER_LONG != 64
126 static inline void
127 xfs_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
138 static inline void
139 xfs_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__ */
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