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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996, 1997
* Sleepycat Software. All rights reserved.
*/
#include "config.h"
#ifndef lint
static const char sccsid[] = "@(#)mp_fput.c 10.10 (Sleepycat) 7/20/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#include <stdlib.h>
#endif
#include "db_int.h"
#include "shqueue.h"
#include "db_shash.h"
#include "mp.h"
#include "common_ext.h"
/*
* memp_fput --
* Mpool file put function.
*/
int
memp_fput(dbmfp, pgaddr, flags)
DB_MPOOLFILE *dbmfp;
void *pgaddr;
u_long flags;
{
BH *bhp;
DB_MPOOL *dbmp;
MPOOLFILE *mfp;
int wrote, ret;
dbmp = dbmfp->dbmp;
/* Validate arguments. */
if (flags) {
if ((ret = __db_fchk(dbmp->dbenv, "memp_fput", flags,
DB_MPOOL_CLEAN | DB_MPOOL_DIRTY | DB_MPOOL_DISCARD)) != 0)
return (ret);
if ((ret = __db_fcchk(dbmp->dbenv, "memp_fput",
flags, DB_MPOOL_CLEAN, DB_MPOOL_DIRTY)) != 0)
return (ret);
if (LF_ISSET(DB_MPOOL_DIRTY) && F_ISSET(dbmfp, MP_READONLY)) {
__db_err(dbmp->dbenv,
"%s: dirty flag set for readonly file page",
dbmfp->path);
return (EACCES);
}
}
/* Decrement the pinned reference count. */
LOCKHANDLE(dbmp, &dbmfp->mutex);
if (dbmfp->pinref == 0)
__db_err(dbmp->dbenv,
"%s: put: more blocks returned than retrieved",
dbmfp->path);
else
--dbmfp->pinref;
UNLOCKHANDLE(dbmp, &dbmfp->mutex);
/*
* If we're mapping the file, there's nothing to do. Because we can
* quit mapping at any time, we have to check on each buffer to see
* if it's in the map region.
*/
if (dbmfp->addr != NULL && pgaddr >= dbmfp->addr &&
(u_int8_t *)pgaddr <= (u_int8_t *)dbmfp->addr + dbmfp->len)
return (0);
/* Convert the page address to a buffer header. */
bhp = (BH *)((u_int8_t *)pgaddr - SSZA(BH, buf));
LOCKREGION(dbmp);
/* Set/clear the page bits. */
if (LF_ISSET(DB_MPOOL_CLEAN))
F_CLR(bhp, BH_DIRTY);
if (LF_ISSET(DB_MPOOL_DIRTY))
F_SET(bhp, BH_DIRTY);
if (LF_ISSET(DB_MPOOL_DISCARD))
F_SET(bhp, BH_DISCARD);
/*
* If more than one reference to the page, we're done. Ignore discard
* flags (for now) and leave it at its position in the LRU chain. The
* rest gets done at last reference close.
*/
#ifdef DEBUG
if (bhp->ref == 0) {
__db_err(dbmp->dbenv,
"Internal error: bhp->ref on page %lu went negative.",
(u_long)bhp->pgno);
abort();
}
#endif
if (--bhp->ref > 0) {
UNLOCKREGION(dbmp);
return (0);
}
/* Move the buffer to the head/tail of the LRU chain. */
SH_TAILQ_REMOVE(&dbmp->mp->bhq, bhp, q, __bh);
if (F_ISSET(bhp, BH_DISCARD))
SH_TAILQ_INSERT_HEAD(&dbmp->mp->bhq, bhp, q, __bh);
else
SH_TAILQ_INSERT_TAIL(&dbmp->mp->bhq, bhp, q);
/*
* If this buffer is scheduled for writing because of a checkpoint,
* write it now. If we can't write it, set a flag so that the next
* time the memp_sync function is called we try writing it there,
* as the checkpoint application better be able to write all of the
* files.
*/
if (F_ISSET(bhp, BH_WRITE))
if (F_ISSET(bhp, BH_DIRTY)) {
if (__memp_bhwrite(dbmp,
dbmfp->mfp, bhp, NULL, &wrote) != 0 || !wrote)
F_SET(dbmp->mp, MP_LSN_RETRY);
} else {
F_CLR(bhp, BH_WRITE);
mfp = ADDR(dbmp, bhp->mf_offset);
--mfp->lsn_cnt;
--dbmp->mp->lsn_cnt;
}
UNLOCKREGION(dbmp);
return (0);
}
|
