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[J-linux.git] / fs / xfs / xfs_trans_priv.h
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 xlog;
10 struct xfs_log_item;
11 struct xfs_mount;
12 struct xfs_trans;
13 struct xfs_ail;
14 struct xfs_log_vec;
15
16
17 void    xfs_trans_init(struct xfs_mount *);
18 void    xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
19 void    xfs_trans_del_item(struct xfs_log_item *);
20 void    xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
21
22 /*
23  * AIL traversal cursor.
24  *
25  * Rather than using a generation number for detecting changes in the ail, use
26  * a cursor that is protected by the ail lock. The aild cursor exists in the
27  * struct xfs_ail, but other traversals can declare it on the stack and link it
28  * to the ail list.
29  *
30  * When an object is deleted from or moved int the AIL, the cursor list is
31  * searched to see if the object is a designated cursor item. If it is, it is
32  * deleted from the cursor so that the next time the cursor is used traversal
33  * will return to the start.
34  *
35  * This means a traversal colliding with a removal will cause a restart of the
36  * list scan, rather than any insertion or deletion anywhere in the list. The
37  * low bit of the item pointer is set if the cursor has been invalidated so
38  * that we can tell the difference between invalidation and reaching the end
39  * of the list to trigger traversal restarts.
40  */
41 struct xfs_ail_cursor {
42         struct list_head        list;
43         struct xfs_log_item     *item;
44 };
45
46 /*
47  * Private AIL structures.
48  *
49  * Eventually we need to drive the locking in here as well.
50  */
51 struct xfs_ail {
52         struct xlog             *ail_log;
53         struct task_struct      *ail_task;
54         struct list_head        ail_head;
55         struct list_head        ail_cursors;
56         spinlock_t              ail_lock;
57         xfs_lsn_t               ail_last_pushed_lsn;
58         xfs_lsn_t               ail_head_lsn;
59         int                     ail_log_flush;
60         unsigned long           ail_opstate;
61         struct list_head        ail_buf_list;
62         wait_queue_head_t       ail_empty;
63         xfs_lsn_t               ail_target;
64 };
65
66 /* Push all items out of the AIL immediately. */
67 #define XFS_AIL_OPSTATE_PUSH_ALL        0u
68
69 /*
70  * From xfs_trans_ail.c
71  */
72 void    xfs_trans_ail_update_bulk(struct xfs_ail *ailp,
73                                 struct xfs_ail_cursor *cur,
74                                 struct xfs_log_item **log_items, int nr_items,
75                                 xfs_lsn_t lsn) __releases(ailp->ail_lock);
76 /*
77  * Return a pointer to the first item in the AIL.  If the AIL is empty, then
78  * return NULL.
79  */
80 static inline struct xfs_log_item *
81 xfs_ail_min(
82         struct xfs_ail  *ailp)
83 {
84         return list_first_entry_or_null(&ailp->ail_head, struct xfs_log_item,
85                                         li_ail);
86 }
87
88 static inline void
89 xfs_trans_ail_update(
90         struct xfs_ail          *ailp,
91         struct xfs_log_item     *lip,
92         xfs_lsn_t               lsn) __releases(ailp->ail_lock)
93 {
94         xfs_trans_ail_update_bulk(ailp, NULL, &lip, 1, lsn);
95 }
96
97 void xfs_trans_ail_insert(struct xfs_ail *ailp, struct xfs_log_item *lip,
98                 xfs_lsn_t lsn);
99
100 xfs_lsn_t xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip);
101 void xfs_ail_update_finish(struct xfs_ail *ailp, xfs_lsn_t old_lsn)
102                         __releases(ailp->ail_lock);
103 void xfs_trans_ail_delete(struct xfs_log_item *lip, int shutdown_type);
104
105 static inline void xfs_ail_push(struct xfs_ail *ailp)
106 {
107         wake_up_process(ailp->ail_task);
108 }
109
110 static inline void xfs_ail_push_all(struct xfs_ail *ailp)
111 {
112         if (!test_and_set_bit(XFS_AIL_OPSTATE_PUSH_ALL, &ailp->ail_opstate))
113                 xfs_ail_push(ailp);
114 }
115
116 static inline xfs_lsn_t xfs_ail_get_push_target(struct xfs_ail *ailp)
117 {
118         return READ_ONCE(ailp->ail_target);
119 }
120
121 void                    xfs_ail_push_all_sync(struct xfs_ail *ailp);
122 xfs_lsn_t               xfs_ail_min_lsn(struct xfs_ail *ailp);
123
124 struct xfs_log_item *   xfs_trans_ail_cursor_first(struct xfs_ail *ailp,
125                                         struct xfs_ail_cursor *cur,
126                                         xfs_lsn_t lsn);
127 struct xfs_log_item *   xfs_trans_ail_cursor_last(struct xfs_ail *ailp,
128                                         struct xfs_ail_cursor *cur,
129                                         xfs_lsn_t lsn);
130 struct xfs_log_item *   xfs_trans_ail_cursor_next(struct xfs_ail *ailp,
131                                         struct xfs_ail_cursor *cur);
132 void                    xfs_trans_ail_cursor_done(struct xfs_ail_cursor *cur);
133
134 void                    __xfs_ail_assign_tail_lsn(struct xfs_ail *ailp);
135
136 static inline void
137 xfs_ail_assign_tail_lsn(
138         struct xfs_ail          *ailp)
139 {
140
141         spin_lock(&ailp->ail_lock);
142         __xfs_ail_assign_tail_lsn(ailp);
143         spin_unlock(&ailp->ail_lock);
144 }
145
146 #if BITS_PER_LONG != 64
147 static inline void
148 xfs_trans_ail_copy_lsn(
149         struct xfs_ail  *ailp,
150         xfs_lsn_t       *dst,
151         xfs_lsn_t       *src)
152 {
153         ASSERT(sizeof(xfs_lsn_t) == 8); /* don't lock if it shrinks */
154         spin_lock(&ailp->ail_lock);
155         *dst = *src;
156         spin_unlock(&ailp->ail_lock);
157 }
158 #else
159 static inline void
160 xfs_trans_ail_copy_lsn(
161         struct xfs_ail  *ailp,
162         xfs_lsn_t       *dst,
163         xfs_lsn_t       *src)
164 {
165         ASSERT(sizeof(xfs_lsn_t) == 8);
166         *dst = *src;
167 }
168 #endif
169
170 static inline void
171 xfs_clear_li_failed(
172         struct xfs_log_item     *lip)
173 {
174         struct xfs_buf  *bp = lip->li_buf;
175
176         ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags));
177         lockdep_assert_held(&lip->li_ailp->ail_lock);
178
179         if (test_and_clear_bit(XFS_LI_FAILED, &lip->li_flags)) {
180                 lip->li_buf = NULL;
181                 xfs_buf_rele(bp);
182         }
183 }
184
185 static inline void
186 xfs_set_li_failed(
187         struct xfs_log_item     *lip,
188         struct xfs_buf          *bp)
189 {
190         lockdep_assert_held(&lip->li_ailp->ail_lock);
191
192         if (!test_and_set_bit(XFS_LI_FAILED, &lip->li_flags)) {
193                 xfs_buf_hold(bp);
194                 lip->li_buf = bp;
195         }
196 }
197
198 #endif  /* __XFS_TRANS_PRIV_H__ */
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