1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/*-
* Copyright (c) 2014-2017 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_log_system_record --
* Write a system log record for the previous LSN.
*/
int
__wt_log_system_record(
WT_SESSION_IMPL *session, WT_FH *log_fh, WT_LSN *lsn)
{
WT_DECL_ITEM(logrec_buf);
WT_DECL_RET;
WT_LOG *log;
WT_LOG_RECORD *logrec;
WT_LOGSLOT tmp;
WT_MYSLOT myslot;
const char *fmt = WT_UNCHECKED_STRING(I);
uint32_t rectype = WT_LOGREC_SYSTEM;
size_t recsize;
log = S2C(session)->log;
WT_RET(__wt_logrec_alloc(session, log->allocsize, &logrec_buf));
memset((uint8_t *)logrec_buf->mem, 0, log->allocsize);
WT_ERR(__wt_struct_size(session, &recsize, fmt, rectype));
WT_ERR(__wt_struct_pack(session,
(uint8_t *)logrec_buf->data + logrec_buf->size, recsize, fmt,
rectype));
logrec_buf->size += recsize;
WT_ERR(__wt_logop_prev_lsn_pack(session, logrec_buf, lsn));
WT_ASSERT(session, logrec_buf->size <= log->allocsize);
logrec = (WT_LOG_RECORD *)logrec_buf->mem;
/*
* We know system records are this size. And we have to adjust
* the size now because we're not going through the normal log
* write path and the packing functions needed the correct offset
* earlier.
*/
logrec_buf->size = logrec->len = log->allocsize;
/* We do not compress nor encrypt this record. */
logrec->checksum = 0;
logrec->flags = 0;
__wt_log_record_byteswap(logrec);
logrec->checksum = __wt_checksum(logrec, log->allocsize);
#ifdef WORDS_BIGENDIAN
logrec->checksum = __wt_bswap32(logrec->checksum);
#endif
WT_CLEAR(tmp);
memset(&myslot, 0, sizeof(myslot));
myslot.slot = &tmp;
__wt_log_slot_activate(session, &tmp);
/*
* Override the file handle to the one we're using.
*/
tmp.slot_fh = log_fh;
WT_ERR(__wt_log_fill(session, &myslot, true, logrec_buf, NULL));
err: __wt_logrec_free(session, &logrec_buf);
return (ret);
}
/*
* __wt_log_recover_system --
* Process a system log record for the previous LSN in recovery.
*/
int
__wt_log_recover_system(WT_SESSION_IMPL *session,
const uint8_t **pp, const uint8_t *end, WT_LSN *lsnp)
{
WT_DECL_RET;
if ((ret = __wt_logop_prev_lsn_unpack(session, pp, end, lsnp)) != 0)
WT_RET_MSG(session, ret,
"log_recover_prevlsn: unpack failure");
return (0);
}
|
