1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * Copyright (C) 2016 Oracle. All Rights Reserved.
4 * Author: Darrick J. Wong <darrick.wong@oracle.com>
5 */
6 #ifndef __XFS_DEFER_H__
7 #define __XFS_DEFER_H__
8
9 struct xfs_btree_cur;
10 struct xfs_defer_op_type;
11 struct xfs_defer_capture;
12
13 /*
14 * Save a log intent item and a list of extents, so that we can replay
15 * whatever action had to happen to the extent list and file the log done
16 * item.
17 */
18 struct xfs_defer_pending {
19 struct list_head dfp_list; /* pending items */
20 struct list_head dfp_work; /* work items */
21 struct xfs_log_item *dfp_intent; /* log intent item */
22 struct xfs_log_item *dfp_done; /* log done item */
23 const struct xfs_defer_op_type *dfp_ops;
24 unsigned int dfp_count; /* # extent items */
25 unsigned int dfp_flags;
26 };
27
28 /*
29 * Create a log intent item for this deferred item, but don't actually finish
30 * the work. Caller must clear this before the final transaction commit.
31 */
32 #define XFS_DEFER_PAUSED (1U << 0)
33
34 #define XFS_DEFER_PENDING_STRINGS \
35 { XFS_DEFER_PAUSED, "paused" }
36
37 void xfs_defer_item_pause(struct xfs_trans *tp, struct xfs_defer_pending *dfp);
38 void xfs_defer_item_unpause(struct xfs_trans *tp, struct xfs_defer_pending *dfp);
39
40 struct xfs_defer_pending *xfs_defer_add(struct xfs_trans *tp, struct list_head *h,
41 const struct xfs_defer_op_type *ops);
42 int xfs_defer_finish_noroll(struct xfs_trans **tp);
43 int xfs_defer_finish(struct xfs_trans **tp);
44 int xfs_defer_finish_one(struct xfs_trans *tp, struct xfs_defer_pending *dfp);
45 void xfs_defer_cancel(struct xfs_trans *);
46 void xfs_defer_move(struct xfs_trans *dtp, struct xfs_trans *stp);
47
48 /* Description of a deferred type. */
49 struct xfs_defer_op_type {
50 const char *name;
51 unsigned int max_items;
52 struct xfs_log_item *(*create_intent)(struct xfs_trans *tp,
53 struct list_head *items, unsigned int count, bool sort);
54 void (*abort_intent)(struct xfs_log_item *intent);
55 struct xfs_log_item *(*create_done)(struct xfs_trans *tp,
56 struct xfs_log_item *intent, unsigned int count);
57 int (*finish_item)(struct xfs_trans *tp, struct xfs_log_item *done,
58 struct list_head *item, struct xfs_btree_cur **state);
59 void (*finish_cleanup)(struct xfs_trans *tp,
60 struct xfs_btree_cur *state, int error);
61 void (*cancel_item)(struct list_head *item);
62 int (*recover_work)(struct xfs_defer_pending *dfp,
63 struct list_head *capture_list);
64 struct xfs_log_item *(*relog_intent)(struct xfs_trans *tp,
65 struct xfs_log_item *intent,
66 struct xfs_log_item *done_item);
67 };
68
69 extern const struct xfs_defer_op_type xfs_bmap_update_defer_type;
70 extern const struct xfs_defer_op_type xfs_refcount_update_defer_type;
71 extern const struct xfs_defer_op_type xfs_rmap_update_defer_type;
72 extern const struct xfs_defer_op_type xfs_extent_free_defer_type;
73 extern const struct xfs_defer_op_type xfs_agfl_free_defer_type;
74 extern const struct xfs_defer_op_type xfs_attr_defer_type;
75
76
77 /*
78 * Deferred operation item relogging limits.
79 */
80 #define XFS_DEFER_OPS_NR_INODES 2 /* join up to two inodes */
81 #define XFS_DEFER_OPS_NR_BUFS 2 /* join up to two buffers */
82
83 /* Resources that must be held across a transaction roll. */
84 struct xfs_defer_resources {
85 /* held buffers */
86 struct xfs_buf *dr_bp[XFS_DEFER_OPS_NR_BUFS];
87
88 /* inodes with no unlock flags */
89 struct xfs_inode *dr_ip[XFS_DEFER_OPS_NR_INODES];
90
91 /* number of held buffers */
92 unsigned short dr_bufs;
93
94 /* bitmap of ordered buffers */
95 unsigned short dr_ordered;
96
97 /* number of held inodes */
98 unsigned short dr_inos;
99 };
100
101 /*
102 * This structure enables a dfops user to detach the chain of deferred
103 * operations from a transaction so that they can be continued later.
104 */
105 struct xfs_defer_capture {
106 /* List of other capture structures. */
107 struct list_head dfc_list;
108
109 /* Deferred ops state saved from the transaction. */
110 struct list_head dfc_dfops;
111 unsigned int dfc_tpflags;
112
113 /* Block reservations for the data and rt devices. */
114 unsigned int dfc_blkres;
115 unsigned int dfc_rtxres;
116
117 /* Log reservation saved from the transaction. */
118 unsigned int dfc_logres;
119
120 struct xfs_defer_resources dfc_held;
121 };
122
123 /*
124 * Functions to capture a chain of deferred operations and continue them later.
125 * This doesn't normally happen except log recovery.
126 */
127 int xfs_defer_ops_capture_and_commit(struct xfs_trans *tp,
128 struct list_head *capture_list);
129 void xfs_defer_ops_continue(struct xfs_defer_capture *d, struct xfs_trans *tp,
130 struct xfs_defer_resources *dres);
131 void xfs_defer_ops_capture_abort(struct xfs_mount *mp,
132 struct xfs_defer_capture *d);
133 void xfs_defer_resources_rele(struct xfs_defer_resources *dres);
134
135 void xfs_defer_start_recovery(struct xfs_log_item *lip,
136 struct list_head *r_dfops, const struct xfs_defer_op_type *ops);
137 void xfs_defer_cancel_recovery(struct xfs_mount *mp,
138 struct xfs_defer_pending *dfp);
139 int xfs_defer_finish_recovery(struct xfs_mount *mp,
140 struct xfs_defer_pending *dfp, struct list_head *capture_list);
141
142 static inline void
xfs_defer_add_item(struct xfs_defer_pending * dfp,struct list_head * work)143 xfs_defer_add_item(
144 struct xfs_defer_pending *dfp,
145 struct list_head *work)
146 {
147 list_add_tail(work, &dfp->dfp_work);
148 dfp->dfp_count++;
149 }
150
151 int __init xfs_defer_init_item_caches(void);
152 void xfs_defer_destroy_item_caches(void);
153
154 void xfs_defer_add_barrier(struct xfs_trans *tp);
155
156 #endif /* __XFS_DEFER_H__ */
157