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
29 void xfs_trans_init(struct xfs_mount *);
30 void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
31 void xfs_trans_del_item(struct xfs_log_item *);
32 void xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
33 bool abort);
34 void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
35
36 void xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
37 xfs_lsn_t commit_lsn, int aborted);
38 /*
39 * AIL traversal cursor.
40 *
41 * Rather than using a generation number for detecting changes in the ail, use
42 * a cursor that is protected by the ail lock. The aild cursor exists in the
43 * struct xfs_ail, but other traversals can declare it on the stack and link it
44 * to the ail list.
45 *
46 * When an object is deleted from or moved int the AIL, the cursor list is
47 * searched to see if the object is a designated cursor item. If it is, it is
48 * deleted from the cursor so that the next time the cursor is used traversal
49 * will return to the start.
50 *
51 * This means a traversal colliding with a removal will cause a restart of the
52 * list scan, rather than any insertion or deletion anywhere in the list. The
53 * low bit of the item pointer is set if the cursor has been invalidated so
54 * that we can tell the difference between invalidation and reaching the end
55 * of the list to trigger traversal restarts.
56 */
57 struct xfs_ail_cursor {
58 struct list_head list;
59 struct xfs_log_item *item;
60 };
61
62 /*
63 * Private AIL structures.
64 *
65 * Eventually we need to drive the locking in here as well.
66 */
67 struct xfs_ail {
68 struct xfs_mount *xa_mount;
69 struct task_struct *xa_task;
70 struct list_head xa_ail;
71 xfs_lsn_t xa_target;
72 xfs_lsn_t xa_target_prev;
73 struct list_head xa_cursors;
74 spinlock_t xa_lock;
75 xfs_lsn_t xa_last_pushed_lsn;
76 int xa_log_flush;
77 struct list_head xa_buf_list;
78 wait_queue_head_t xa_empty;
79 };
80
81 /*
82 * From xfs_trans_ail.c
83 */
84 void 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);
88 /*
89 * Return a pointer to the first item in the AIL. If the AIL is empty, then
90 * return NULL.
91 */
92 static inline struct xfs_log_item *
xfs_ail_min(struct xfs_ail * ailp)93 xfs_ail_min(
94 struct xfs_ail *ailp)
95 {
96 return list_first_entry_or_null(&ailp->xa_ail, struct xfs_log_item,
97 li_ail);
98 }
99
100 static inline void
xfs_trans_ail_update(struct xfs_ail * ailp,struct xfs_log_item * lip,xfs_lsn_t lsn)101 xfs_trans_ail_update(
102 struct xfs_ail *ailp,
103 struct xfs_log_item *lip,
104 xfs_lsn_t lsn) __releases(ailp->xa_lock)
105 {
106 xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
107 }
108
109 bool xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip);
110 void xfs_trans_ail_delete(struct xfs_ail *ailp, struct xfs_log_item *lip,
111 int shutdown_type) __releases(ailp->xa_lock);
112
113 static inline void
xfs_trans_ail_remove(struct xfs_log_item * lip,int shutdown_type)114 xfs_trans_ail_remove(
115 struct xfs_log_item *lip,
116 int shutdown_type)
117 {
118 struct xfs_ail *ailp = lip->li_ailp;
119
120 spin_lock(&ailp->xa_lock);
121 /* xfs_trans_ail_delete() drops the AIL lock */
122 if (lip->li_flags & XFS_LI_IN_AIL)
123 xfs_trans_ail_delete(ailp, lip, shutdown_type);
124 else
125 spin_unlock(&ailp->xa_lock);
126 }
127
128 void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
129 void xfs_ail_push_all(struct xfs_ail *);
130 void xfs_ail_push_all_sync(struct xfs_ail *);
131 struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp);
132 xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
133
134 struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
135 struct xfs_ail_cursor *cur,
136 xfs_lsn_t lsn);
137 struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
138 struct xfs_ail_cursor *cur,
139 xfs_lsn_t lsn);
140 struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
141 struct xfs_ail_cursor *cur);
142 void xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
143
144 #if BITS_PER_LONG != 64
145 static inline void
xfs_trans_ail_copy_lsn(struct xfs_ail * ailp,xfs_lsn_t * dst,xfs_lsn_t * src)146 xfs_trans_ail_copy_lsn(
147 struct xfs_ail *ailp,
148 xfs_lsn_t *dst,
149 xfs_lsn_t *src)
150 {
151 ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
152 spin_lock(&ailp->xa_lock);
153 *dst = *src;
154 spin_unlock(&ailp->xa_lock);
155 }
156 #else
157 static inline void
xfs_trans_ail_copy_lsn(struct xfs_ail * ailp,xfs_lsn_t * dst,xfs_lsn_t * src)158 xfs_trans_ail_copy_lsn(
159 struct xfs_ail *ailp,
160 xfs_lsn_t *dst,
161 xfs_lsn_t *src)
162 {
163 ASSERT(sizeof(xfs_lsn_t) == 8);
164 *dst = *src;
165 }
166 #endif
167
168 static inline void
xfs_clear_li_failed(struct xfs_log_item * lip)169 xfs_clear_li_failed(
170 struct xfs_log_item *lip)
171 {
172 struct xfs_buf *bp = lip->li_buf;
173
174 ASSERT(lip->li_flags & XFS_LI_IN_AIL);
175 lockdep_assert_held(&lip->li_ailp->xa_lock);
176
177 if (lip->li_flags & XFS_LI_FAILED) {
178 lip->li_flags &= ~XFS_LI_FAILED;
179 lip->li_buf = NULL;
180 xfs_buf_rele(bp);
181 }
182 }
183
184 static inline void
xfs_set_li_failed(struct xfs_log_item * lip,struct xfs_buf * bp)185 xfs_set_li_failed(
186 struct xfs_log_item *lip,
187 struct xfs_buf *bp)
188 {
189 lockdep_assert_held(&lip->li_ailp->xa_lock);
190
191 if (!(lip->li_flags & XFS_LI_FAILED)) {
192 xfs_buf_hold(bp);
193 lip->li_flags |= XFS_LI_FAILED;
194 lip->li_buf = bp;
195 }
196 }
197
198 #endif /* __XFS_TRANS_PRIV_H__ */
199