1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000,2002,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #ifndef __XFS_TRANS_PRIV_H__
7 #define __XFS_TRANS_PRIV_H__
8
9 struct xfs_log_item;
10 struct xfs_mount;
11 struct xfs_trans;
12 struct xfs_ail;
13 struct xfs_log_vec;
14
15
16 void xfs_trans_init(struct xfs_mount *);
17 void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
18 void xfs_trans_del_item(struct xfs_log_item *);
19 void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
20
21 void xfs_trans_committed_bulk(struct xfs_ail *ailp, struct xfs_log_vec *lv,
22 xfs_lsn_t commit_lsn, bool aborted);
23 /*
24 * AIL traversal cursor.
25 *
26 * Rather than using a generation number for detecting changes in the ail, use
27 * a cursor that is protected by the ail lock. The aild cursor exists in the
28 * struct xfs_ail, but other traversals can declare it on the stack and link it
29 * to the ail list.
30 *
31 * When an object is deleted from or moved int the AIL, the cursor list is
32 * searched to see if the object is a designated cursor item. If it is, it is
33 * deleted from the cursor so that the next time the cursor is used traversal
34 * will return to the start.
35 *
36 * This means a traversal colliding with a removal will cause a restart of the
37 * list scan, rather than any insertion or deletion anywhere in the list. The
38 * low bit of the item pointer is set if the cursor has been invalidated so
39 * that we can tell the difference between invalidation and reaching the end
40 * of the list to trigger traversal restarts.
41 */
42 struct xfs_ail_cursor {
43 struct list_head list;
44 struct xfs_log_item *item;
45 };
46
47 /*
48 * Private AIL structures.
49 *
50 * Eventually we need to drive the locking in here as well.
51 */
52 struct xfs_ail {
53 struct xfs_mount *ail_mount;
54 struct task_struct *ail_task;
55 struct list_head ail_head;
56 xfs_lsn_t ail_target;
57 xfs_lsn_t ail_target_prev;
58 struct list_head ail_cursors;
59 spinlock_t ail_lock;
60 xfs_lsn_t ail_last_pushed_lsn;
61 int ail_log_flush;
62 struct list_head ail_buf_list;
63 wait_queue_head_t ail_empty;
64 };
65
66 /*
67 * From xfs_trans_ail.c
68 */
69 void xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
70 struct xfs_ail_cursor *cur,
71 struct xfs_log_item **log_items, int nr_items,
72 xfs_lsn_t lsn) __releases(ailp->ail_lock);
73 /*
74 * Return a pointer to the first item in the AIL. If the AIL is empty, then
75 * return NULL.
76 */
77 static inline struct xfs_log_item *
xfs_ail_min(struct xfs_ail * ailp)78 xfs_ail_min(
79 struct xfs_ail *ailp)
80 {
81 return list_first_entry_or_null(&ailp->ail_head, struct xfs_log_item,
82 li_ail);
83 }
84
85 static inline void
xfs_trans_ail_update(struct xfs_ail * ailp,struct xfs_log_item * lip,xfs_lsn_t lsn)86 xfs_trans_ail_update(
87 struct xfs_ail *ailp,
88 struct xfs_log_item *lip,
89 xfs_lsn_t lsn) __releases(ailp->ail_lock)
90 {
91 xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
92 }
93
94 bool xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip);
95 void xfs_trans_ail_delete(struct xfs_ail *ailp, struct xfs_log_item *lip,
96 int shutdown_type) __releases(ailp->ail_lock);
97
98 static inline void
xfs_trans_ail_remove(struct xfs_log_item * lip,int shutdown_type)99 xfs_trans_ail_remove(
100 struct xfs_log_item *lip,
101 int shutdown_type)
102 {
103 struct xfs_ail *ailp = lip->li_ailp;
104
105 spin_lock(&ailp->ail_lock);
106 /* xfs_trans_ail_delete() drops the AIL lock */
107 if (test_bit(XFS_LI_IN_AIL, &lip->li_flags))
108 xfs_trans_ail_delete(ailp, lip, shutdown_type);
109 else
110 spin_unlock(&ailp->ail_lock);
111 }
112
113 void xfs_ail_push(struct xfs_ail *, xfs_lsn_t);
114 void xfs_ail_push_all(struct xfs_ail *);
115 void xfs_ail_push_all_sync(struct xfs_ail *);
116 struct xfs_log_item *xfs_ail_min(struct xfs_ail *ailp);
117 xfs_lsn_t xfs_ail_min_lsn(struct xfs_ail *ailp);
118
119 struct xfs_log_item * xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
120 struct xfs_ail_cursor *cur,
121 xfs_lsn_t lsn);
122 struct xfs_log_item * xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
123 struct xfs_ail_cursor *cur,
124 xfs_lsn_t lsn);
125 struct xfs_log_item * xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
126 struct xfs_ail_cursor *cur);
127 void xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
128
129 #if BITS_PER_LONG != 64
130 static inline void
xfs_trans_ail_copy_lsn(struct xfs_ail * ailp,xfs_lsn_t * dst,xfs_lsn_t * src)131 xfs_trans_ail_copy_lsn(
132 struct xfs_ail *ailp,
133 xfs_lsn_t *dst,
134 xfs_lsn_t *src)
135 {
136 ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
137 spin_lock(&ailp->ail_lock);
138 *dst = *src;
139 spin_unlock(&ailp->ail_lock);
140 }
141 #else
142 static inline void
xfs_trans_ail_copy_lsn(struct xfs_ail * ailp,xfs_lsn_t * dst,xfs_lsn_t * src)143 xfs_trans_ail_copy_lsn(
144 struct xfs_ail *ailp,
145 xfs_lsn_t *dst,
146 xfs_lsn_t *src)
147 {
148 ASSERT(sizeof(xfs_lsn_t) == 8);
149 *dst = *src;
150 }
151 #endif
152
153 static inline void
xfs_clear_li_failed(struct xfs_log_item * lip)154 xfs_clear_li_failed(
155 struct xfs_log_item *lip)
156 {
157 struct xfs_buf *bp = lip->li_buf;
158
159 ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags));
160 lockdep_assert_held(&lip->li_ailp->ail_lock);
161
162 if (test_and_clear_bit(XFS_LI_FAILED, &lip->li_flags)) {
163 lip->li_buf = NULL;
164 xfs_buf_rele(bp);
165 }
166 }
167
168 static inline void
xfs_set_li_failed(struct xfs_log_item * lip,struct xfs_buf * bp)169 xfs_set_li_failed(
170 struct xfs_log_item *lip,
171 struct xfs_buf *bp)
172 {
173 lockdep_assert_held(&lip->li_ailp->ail_lock);
174
175 if (!test_and_set_bit(XFS_LI_FAILED, &lip->li_flags)) {
176 xfs_buf_hold(bp);
177 lip->li_buf = bp;
178 }
179 }
180
181 #endif /* __XFS_TRANS_PRIV_H__ */
182
