1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6 #ifndef __XFS_LOG_H__
7 #define __XFS_LOG_H__
8
9 struct xfs_cil_ctx;
10
11 struct xfs_log_vec {
12 struct list_head lv_list; /* CIL lv chain ptrs */
13 uint32_t lv_order_id; /* chain ordering info */
14 int lv_niovecs; /* number of iovecs in lv */
15 struct xfs_log_iovec *lv_iovecp; /* iovec array */
16 struct xfs_log_item *lv_item; /* owner */
17 char *lv_buf; /* formatted buffer */
18 int lv_bytes; /* accounted space in buffer */
19 int lv_buf_len; /* aligned size of buffer */
20 int lv_size; /* size of allocated lv */
21 };
22
23 #define XFS_LOG_VEC_ORDERED (-1)
24
25 /*
26 * Calculate the log iovec length for a given user buffer length. Intended to be
27 * used by ->iop_size implementations when sizing buffers of arbitrary
28 * alignments.
29 */
30 static inline int
31 xlog_calc_iovec_len(int len)
32 {
33 return roundup(len, sizeof(uint32_t));
34 }
35
36 void *xlog_prepare_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
37 uint type);
38
39 static inline void
40 xlog_finish_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec *vec,
41 int data_len)
42 {
43 struct xlog_op_header *oph = vec->i_addr;
44 int len;
45
46 /*
47 * Always round up the length to the correct alignment so callers don't
48 * need to know anything about this log vec layout requirement. This
49 * means we have to zero the area the data to be written does not cover.
50 * This is complicated by fact the payload region is offset into the
51 * logvec region by the opheader that tracks the payload.
52 */
53 len = xlog_calc_iovec_len(data_len);
54 if (len - data_len != 0) {
55 char *buf = vec->i_addr + sizeof(struct xlog_op_header);
56
57 memset(buf + data_len, 0, len - data_len);
58 }
59
60 /*
61 * The opheader tracks aligned payload length, whilst the logvec tracks
62 * the overall region length.
63 */
64 oph->oh_len = cpu_to_be32(len);
65
66 len += sizeof(struct xlog_op_header);
67 lv->lv_buf_len += len;
68 lv->lv_bytes += len;
69 vec->i_len = len;
70
71 /* Catch buffer overruns */
72 ASSERT((void *)lv->lv_buf + lv->lv_bytes <= (void *)lv + lv->lv_size);
73 }
74
75 /*
76 * Copy the amount of data requested by the caller into a new log iovec.
77 */
78 static inline void *
79 xlog_copy_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
80 uint type, void *data, int len)
81 {
82 void *buf;
83
84 buf = xlog_prepare_iovec(lv, vecp, type);
85 memcpy(buf, data, len);
86 xlog_finish_iovec(lv, *vecp, len);
87 return buf;
88 }
89
90 static inline void *
91 xlog_copy_from_iovec(struct xfs_log_vec *lv, struct xfs_log_iovec **vecp,
92 const struct xfs_log_iovec *src)
93 {
94 return xlog_copy_iovec(lv, vecp, src->i_type, src->i_addr, src->i_len);
95 }
96
97 /*
98 * By comparing each component, we don't have to worry about extra
99 * endian issues in treating two 32 bit numbers as one 64 bit number
100 */
101 static inline xfs_lsn_t _lsn_cmp(xfs_lsn_t lsn1, xfs_lsn_t lsn2)
102 {
103 if (CYCLE_LSN(lsn1) != CYCLE_LSN(lsn2))
104 return (CYCLE_LSN(lsn1)<CYCLE_LSN(lsn2))? -999 : 999;
105
106 if (BLOCK_LSN(lsn1) != BLOCK_LSN(lsn2))
107 return (BLOCK_LSN(lsn1)<BLOCK_LSN(lsn2))? -999 : 999;
108
109 return 0;
110 }
111
112 #define XFS_LSN_CMP(x,y) _lsn_cmp(x,y)
113
114 /*
115 * Flags to xfs_log_force()
116 *
117 * XFS_LOG_SYNC: Synchronous force in-core log to disk
118 */
119 #define XFS_LOG_SYNC 0x1
120
121 /* Log manager interfaces */
122 struct xfs_mount;
123 struct xlog_in_core;
124 struct xlog_ticket;
125 struct xfs_log_item;
126 struct xfs_item_ops;
127 struct xfs_trans;
128 struct xlog;
129
130 int xfs_log_force(struct xfs_mount *mp, uint flags);
131 int xfs_log_force_seq(struct xfs_mount *mp, xfs_csn_t seq, uint flags,
132 int *log_forced);
133 int xfs_log_mount(struct xfs_mount *mp,
134 struct xfs_buftarg *log_target,
135 xfs_daddr_t start_block,
136 int num_bblocks);
137 int xfs_log_mount_finish(struct xfs_mount *mp);
138 void xfs_log_mount_cancel(struct xfs_mount *);
139 xfs_lsn_t xlog_assign_tail_lsn(struct xfs_mount *mp);
140 xfs_lsn_t xlog_assign_tail_lsn_locked(struct xfs_mount *mp);
141 void xfs_log_space_wake(struct xfs_mount *mp);
142 int xfs_log_reserve(struct xfs_mount *mp, int length, int count,
143 struct xlog_ticket **ticket, bool permanent);
144 int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
145 void xfs_log_unmount(struct xfs_mount *mp);
146 bool xfs_log_writable(struct xfs_mount *mp);
147
148 struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
149 void xfs_log_ticket_put(struct xlog_ticket *ticket);
150
151 void xlog_cil_process_committed(struct list_head *list);
152 bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
153
154 void xfs_log_work_queue(struct xfs_mount *mp);
155 int xfs_log_quiesce(struct xfs_mount *mp);
156 void xfs_log_clean(struct xfs_mount *mp);
157 bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t);
158
159 bool xlog_force_shutdown(struct xlog *log, uint32_t shutdown_flags);
160
161 int xfs_attr_use_log_assist(struct xfs_mount *mp);
162
163 #endif /* __XFS_LOG_H__ */
164
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