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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 | |
26 | /* |
27 | * From xfs_trans_item.c |
28 | */ |
29 | struct xfs_log_item_desc *xfs_trans_add_item(struct xfs_trans *, |
30 | struct xfs_log_item *); |
31 | void xfs_trans_free_item(struct xfs_trans *, |
32 | struct xfs_log_item_desc *); |
33 | struct xfs_log_item_desc *xfs_trans_find_item(struct xfs_trans *, |
34 | struct xfs_log_item *); |
35 | struct xfs_log_item_desc *xfs_trans_first_item(struct xfs_trans *); |
36 | struct xfs_log_item_desc *xfs_trans_next_item(struct xfs_trans *, |
37 | struct xfs_log_item_desc *); |
38 | void xfs_trans_free_items(struct xfs_trans *, int); |
39 | void xfs_trans_unlock_items(struct xfs_trans *, |
40 | xfs_lsn_t); |
41 | void xfs_trans_free_busy(xfs_trans_t *tp); |
42 | xfs_log_busy_slot_t *xfs_trans_add_busy(xfs_trans_t *tp, |
43 | xfs_agnumber_t ag, |
44 | xfs_extlen_t idx); |
45 | |
46 | /* |
47 | * AIL traversal cursor. |
48 | * |
49 | * Rather than using a generation number for detecting changes in the ail, use |
50 | * a cursor that is protected by the ail lock. The aild cursor exists in the |
51 | * struct xfs_ail, but other traversals can declare it on the stack and link it |
52 | * to the ail list. |
53 | * |
54 | * When an object is deleted from or moved int the AIL, the cursor list is |
55 | * searched to see if the object is a designated cursor item. If it is, it is |
56 | * deleted from the cursor so that the next time the cursor is used traversal |
57 | * will return to the start. |
58 | * |
59 | * This means a traversal colliding with a removal will cause a restart of the |
60 | * list scan, rather than any insertion or deletion anywhere in the list. The |
61 | * low bit of the item pointer is set if the cursor has been invalidated so |
62 | * that we can tell the difference between invalidation and reaching the end |
63 | * of the list to trigger traversal restarts. |
64 | */ |
65 | struct xfs_ail_cursor { |
66 | struct xfs_ail_cursor *next; |
67 | struct xfs_log_item *item; |
68 | }; |
69 | |
70 | /* |
71 | * Private AIL structures. |
72 | * |
73 | * Eventually we need to drive the locking in here as well. |
74 | */ |
75 | struct xfs_ail { |
76 | struct xfs_mount *xa_mount; |
77 | struct list_head xa_ail; |
78 | uint xa_gen; |
79 | struct task_struct *xa_task; |
80 | xfs_lsn_t xa_target; |
81 | struct xfs_ail_cursor xa_cursors; |
82 | spinlock_t xa_lock; |
83 | }; |
84 | |
85 | /* |
86 | * From xfs_trans_ail.c |
87 | */ |
88 | void xfs_trans_ail_update(struct xfs_ail *ailp, |
89 | struct xfs_log_item *lip, xfs_lsn_t lsn) |
90 | __releases(ailp->xa_lock); |
91 | void xfs_trans_ail_delete(struct xfs_ail *ailp, |
92 | struct xfs_log_item *lip) |
93 | __releases(ailp->xa_lock); |
94 | void xfs_trans_ail_push(struct xfs_ail *, xfs_lsn_t); |
95 | void xfs_trans_unlocked_item(struct xfs_ail *, |
96 | xfs_log_item_t *); |
97 | |
98 | xfs_lsn_t xfs_trans_ail_tail(struct xfs_ail *ailp); |
99 | |
100 | struct xfs_log_item *xfs_trans_ail_cursor_first(struct xfs_ail *ailp, |
101 | struct xfs_ail_cursor *cur, |
102 | xfs_lsn_t lsn); |
103 | struct xfs_log_item *xfs_trans_ail_cursor_next(struct xfs_ail *ailp, |
104 | struct xfs_ail_cursor *cur); |
105 | void xfs_trans_ail_cursor_done(struct xfs_ail *ailp, |
106 | struct xfs_ail_cursor *cur); |
107 | |
108 | long xfsaild_push(struct xfs_ail *, xfs_lsn_t *); |
109 | void xfsaild_wakeup(struct xfs_ail *, xfs_lsn_t); |
110 | int xfsaild_start(struct xfs_ail *); |
111 | void xfsaild_stop(struct xfs_ail *); |
112 | |
113 | #if BITS_PER_LONG != 64 |
114 | static inline void |
115 | xfs_trans_ail_copy_lsn( |
116 | struct xfs_ail *ailp, |
117 | xfs_lsn_t *dst, |
118 | xfs_lsn_t *src) |
119 | { |
120 | ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */ |
121 | spin_lock(&ailp->xa_lock); |
122 | *dst = *src; |
123 | spin_unlock(&ailp->xa_lock); |
124 | } |
125 | #else |
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); |
133 | *dst = *src; |
134 | } |
135 | #endif |
136 | #endif /* __XFS_TRANS_PRIV_H__ */ |
137 |
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