1*0Sstevel@tonic-gate /*-
2*0Sstevel@tonic-gate * See the file LICENSE for redistribution information.
3*0Sstevel@tonic-gate *
4*0Sstevel@tonic-gate * Copyright (c) 1996, 1997, 1998
5*0Sstevel@tonic-gate * Sleepycat Software. All rights reserved.
6*0Sstevel@tonic-gate */
7*0Sstevel@tonic-gate #include "config.h"
8*0Sstevel@tonic-gate
9*0Sstevel@tonic-gate #ifndef lint
10*0Sstevel@tonic-gate static const char sccsid[] = "@(#)mp_fput.c 10.24 (Sleepycat) 9/27/98";
11*0Sstevel@tonic-gate #endif /* not lint */
12*0Sstevel@tonic-gate
13*0Sstevel@tonic-gate #ifndef NO_SYSTEM_INCLUDES
14*0Sstevel@tonic-gate #include <sys/types.h>
15*0Sstevel@tonic-gate
16*0Sstevel@tonic-gate #include <errno.h>
17*0Sstevel@tonic-gate #endif
18*0Sstevel@tonic-gate
19*0Sstevel@tonic-gate #include "db_int.h"
20*0Sstevel@tonic-gate #include "shqueue.h"
21*0Sstevel@tonic-gate #include "db_shash.h"
22*0Sstevel@tonic-gate #include "mp.h"
23*0Sstevel@tonic-gate #include "common_ext.h"
24*0Sstevel@tonic-gate
25*0Sstevel@tonic-gate /*
26*0Sstevel@tonic-gate * memp_fput --
27*0Sstevel@tonic-gate * Mpool file put function.
28*0Sstevel@tonic-gate */
29*0Sstevel@tonic-gate int
memp_fput(dbmfp,pgaddr,flags)30*0Sstevel@tonic-gate memp_fput(dbmfp, pgaddr, flags)
31*0Sstevel@tonic-gate DB_MPOOLFILE *dbmfp;
32*0Sstevel@tonic-gate void *pgaddr;
33*0Sstevel@tonic-gate u_int32_t flags;
34*0Sstevel@tonic-gate {
35*0Sstevel@tonic-gate BH *bhp;
36*0Sstevel@tonic-gate DB_MPOOL *dbmp;
37*0Sstevel@tonic-gate MPOOL *mp;
38*0Sstevel@tonic-gate int wrote, ret;
39*0Sstevel@tonic-gate
40*0Sstevel@tonic-gate dbmp = dbmfp->dbmp;
41*0Sstevel@tonic-gate mp = dbmp->mp;
42*0Sstevel@tonic-gate
43*0Sstevel@tonic-gate MP_PANIC_CHECK(dbmp);
44*0Sstevel@tonic-gate
45*0Sstevel@tonic-gate /* Validate arguments. */
46*0Sstevel@tonic-gate if (flags) {
47*0Sstevel@tonic-gate if ((ret = __db_fchk(dbmp->dbenv, "memp_fput", flags,
48*0Sstevel@tonic-gate DB_MPOOL_CLEAN | DB_MPOOL_DIRTY | DB_MPOOL_DISCARD)) != 0)
49*0Sstevel@tonic-gate return (ret);
50*0Sstevel@tonic-gate if ((ret = __db_fcchk(dbmp->dbenv, "memp_fput",
51*0Sstevel@tonic-gate flags, DB_MPOOL_CLEAN, DB_MPOOL_DIRTY)) != 0)
52*0Sstevel@tonic-gate return (ret);
53*0Sstevel@tonic-gate
54*0Sstevel@tonic-gate if (LF_ISSET(DB_MPOOL_DIRTY) && F_ISSET(dbmfp, MP_READONLY)) {
55*0Sstevel@tonic-gate __db_err(dbmp->dbenv,
56*0Sstevel@tonic-gate "%s: dirty flag set for readonly file page",
57*0Sstevel@tonic-gate __memp_fn(dbmfp));
58*0Sstevel@tonic-gate return (EACCES);
59*0Sstevel@tonic-gate }
60*0Sstevel@tonic-gate }
61*0Sstevel@tonic-gate
62*0Sstevel@tonic-gate LOCKREGION(dbmp);
63*0Sstevel@tonic-gate
64*0Sstevel@tonic-gate /* Decrement the pinned reference count. */
65*0Sstevel@tonic-gate if (dbmfp->pinref == 0)
66*0Sstevel@tonic-gate __db_err(dbmp->dbenv,
67*0Sstevel@tonic-gate "%s: put: more blocks returned than retrieved",
68*0Sstevel@tonic-gate __memp_fn(dbmfp));
69*0Sstevel@tonic-gate else
70*0Sstevel@tonic-gate --dbmfp->pinref;
71*0Sstevel@tonic-gate
72*0Sstevel@tonic-gate /*
73*0Sstevel@tonic-gate * If we're mapping the file, there's nothing to do. Because we can
74*0Sstevel@tonic-gate * stop mapping the file at any time, we have to check on each buffer
75*0Sstevel@tonic-gate * to see if the address we gave the application was part of the map
76*0Sstevel@tonic-gate * region.
77*0Sstevel@tonic-gate */
78*0Sstevel@tonic-gate if (dbmfp->addr != NULL && pgaddr >= dbmfp->addr &&
79*0Sstevel@tonic-gate (u_int8_t *)pgaddr <= (u_int8_t *)dbmfp->addr + dbmfp->len) {
80*0Sstevel@tonic-gate UNLOCKREGION(dbmp);
81*0Sstevel@tonic-gate return (0);
82*0Sstevel@tonic-gate }
83*0Sstevel@tonic-gate
84*0Sstevel@tonic-gate /* Convert the page address to a buffer header. */
85*0Sstevel@tonic-gate bhp = (BH *)((u_int8_t *)pgaddr - SSZA(BH, buf));
86*0Sstevel@tonic-gate
87*0Sstevel@tonic-gate /* Set/clear the page bits. */
88*0Sstevel@tonic-gate if (LF_ISSET(DB_MPOOL_CLEAN) && F_ISSET(bhp, BH_DIRTY)) {
89*0Sstevel@tonic-gate ++mp->stat.st_page_clean;
90*0Sstevel@tonic-gate --mp->stat.st_page_dirty;
91*0Sstevel@tonic-gate F_CLR(bhp, BH_DIRTY);
92*0Sstevel@tonic-gate }
93*0Sstevel@tonic-gate if (LF_ISSET(DB_MPOOL_DIRTY) && !F_ISSET(bhp, BH_DIRTY)) {
94*0Sstevel@tonic-gate --mp->stat.st_page_clean;
95*0Sstevel@tonic-gate ++mp->stat.st_page_dirty;
96*0Sstevel@tonic-gate F_SET(bhp, BH_DIRTY);
97*0Sstevel@tonic-gate }
98*0Sstevel@tonic-gate if (LF_ISSET(DB_MPOOL_DISCARD))
99*0Sstevel@tonic-gate F_SET(bhp, BH_DISCARD);
100*0Sstevel@tonic-gate
101*0Sstevel@tonic-gate /*
102*0Sstevel@tonic-gate * Check for a reference count going to zero. This can happen if the
103*0Sstevel@tonic-gate * application returns a page twice.
104*0Sstevel@tonic-gate */
105*0Sstevel@tonic-gate if (bhp->ref == 0) {
106*0Sstevel@tonic-gate __db_err(dbmp->dbenv, "%s: page %lu: unpinned page returned",
107*0Sstevel@tonic-gate __memp_fn(dbmfp), (u_long)bhp->pgno);
108*0Sstevel@tonic-gate UNLOCKREGION(dbmp);
109*0Sstevel@tonic-gate return (EINVAL);
110*0Sstevel@tonic-gate }
111*0Sstevel@tonic-gate
112*0Sstevel@tonic-gate /*
113*0Sstevel@tonic-gate * If more than one reference to the page, we're done. Ignore the
114*0Sstevel@tonic-gate * discard flags (for now) and leave it at its position in the LRU
115*0Sstevel@tonic-gate * chain. The rest gets done at last reference close.
116*0Sstevel@tonic-gate */
117*0Sstevel@tonic-gate if (--bhp->ref > 0) {
118*0Sstevel@tonic-gate UNLOCKREGION(dbmp);
119*0Sstevel@tonic-gate return (0);
120*0Sstevel@tonic-gate }
121*0Sstevel@tonic-gate
122*0Sstevel@tonic-gate /* Move the buffer to the head/tail of the LRU chain. */
123*0Sstevel@tonic-gate SH_TAILQ_REMOVE(&mp->bhq, bhp, q, __bh);
124*0Sstevel@tonic-gate if (F_ISSET(bhp, BH_DISCARD))
125*0Sstevel@tonic-gate SH_TAILQ_INSERT_HEAD(&mp->bhq, bhp, q, __bh);
126*0Sstevel@tonic-gate else
127*0Sstevel@tonic-gate SH_TAILQ_INSERT_TAIL(&mp->bhq, bhp, q);
128*0Sstevel@tonic-gate
129*0Sstevel@tonic-gate /*
130*0Sstevel@tonic-gate * If this buffer is scheduled for writing because of a checkpoint, we
131*0Sstevel@tonic-gate * need to write it (if we marked it dirty), or update the checkpoint
132*0Sstevel@tonic-gate * counters (if we didn't mark it dirty). If we try to write it and
133*0Sstevel@tonic-gate * can't, that's not necessarily an error, but set a flag so that the
134*0Sstevel@tonic-gate * next time the memp_sync function runs we try writing it there, as
135*0Sstevel@tonic-gate * the checkpoint application better be able to write all of the files.
136*0Sstevel@tonic-gate */
137*0Sstevel@tonic-gate if (F_ISSET(bhp, BH_WRITE))
138*0Sstevel@tonic-gate if (F_ISSET(bhp, BH_DIRTY)) {
139*0Sstevel@tonic-gate if (__memp_bhwrite(dbmp,
140*0Sstevel@tonic-gate dbmfp->mfp, bhp, NULL, &wrote) != 0 || !wrote)
141*0Sstevel@tonic-gate F_SET(mp, MP_LSN_RETRY);
142*0Sstevel@tonic-gate } else {
143*0Sstevel@tonic-gate F_CLR(bhp, BH_WRITE);
144*0Sstevel@tonic-gate
145*0Sstevel@tonic-gate --dbmfp->mfp->lsn_cnt;
146*0Sstevel@tonic-gate --mp->lsn_cnt;
147*0Sstevel@tonic-gate }
148*0Sstevel@tonic-gate
149*0Sstevel@tonic-gate UNLOCKREGION(dbmp);
150*0Sstevel@tonic-gate return (0);
151*0Sstevel@tonic-gate }
152