xref: /onnv-gate/usr/src/cmd/sendmail/db/mp/mp_open.c (revision 0:68f95e015346)
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_open.c	10.27 (Sleepycat) 10/1/98";
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 #include <string.h>
18*0Sstevel@tonic-gate #endif
19*0Sstevel@tonic-gate 
20*0Sstevel@tonic-gate #include "db_int.h"
21*0Sstevel@tonic-gate #include "shqueue.h"
22*0Sstevel@tonic-gate #include "db_shash.h"
23*0Sstevel@tonic-gate #include "mp.h"
24*0Sstevel@tonic-gate #include "common_ext.h"
25*0Sstevel@tonic-gate 
26*0Sstevel@tonic-gate /*
27*0Sstevel@tonic-gate  * memp_open --
28*0Sstevel@tonic-gate  *	Initialize and/or join a memory pool.
29*0Sstevel@tonic-gate  */
30*0Sstevel@tonic-gate int
memp_open(path,flags,mode,dbenv,retp)31*0Sstevel@tonic-gate memp_open(path, flags, mode, dbenv, retp)
32*0Sstevel@tonic-gate 	const char *path;
33*0Sstevel@tonic-gate 	u_int32_t flags;
34*0Sstevel@tonic-gate 	int mode;
35*0Sstevel@tonic-gate 	DB_ENV *dbenv;
36*0Sstevel@tonic-gate 	DB_MPOOL **retp;
37*0Sstevel@tonic-gate {
38*0Sstevel@tonic-gate 	DB_MPOOL *dbmp;
39*0Sstevel@tonic-gate 	size_t cachesize;
40*0Sstevel@tonic-gate 	int is_private, ret;
41*0Sstevel@tonic-gate 
42*0Sstevel@tonic-gate 	/* Validate arguments. */
43*0Sstevel@tonic-gate #ifdef HAVE_SPINLOCKS
44*0Sstevel@tonic-gate #define	OKFLAGS	(DB_CREATE | DB_MPOOL_PRIVATE | DB_NOMMAP | DB_THREAD)
45*0Sstevel@tonic-gate #else
46*0Sstevel@tonic-gate #define	OKFLAGS	(DB_CREATE | DB_MPOOL_PRIVATE | DB_NOMMAP)
47*0Sstevel@tonic-gate #endif
48*0Sstevel@tonic-gate 	if ((ret = __db_fchk(dbenv, "memp_open", flags, OKFLAGS)) != 0)
49*0Sstevel@tonic-gate 		return (ret);
50*0Sstevel@tonic-gate 
51*0Sstevel@tonic-gate 	/* Extract fields from DB_ENV structure. */
52*0Sstevel@tonic-gate 	cachesize = dbenv == NULL ? 0 : dbenv->mp_size;
53*0Sstevel@tonic-gate 
54*0Sstevel@tonic-gate 	/* Create and initialize the DB_MPOOL structure. */
55*0Sstevel@tonic-gate 	if ((ret = __os_calloc(1, sizeof(DB_MPOOL), &dbmp)) != 0)
56*0Sstevel@tonic-gate 		return (ret);
57*0Sstevel@tonic-gate 	LIST_INIT(&dbmp->dbregq);
58*0Sstevel@tonic-gate 	TAILQ_INIT(&dbmp->dbmfq);
59*0Sstevel@tonic-gate 
60*0Sstevel@tonic-gate 	dbmp->dbenv = dbenv;
61*0Sstevel@tonic-gate 
62*0Sstevel@tonic-gate 	/* Decide if it's possible for anyone else to access the pool. */
63*0Sstevel@tonic-gate 	is_private =
64*0Sstevel@tonic-gate 	    (dbenv == NULL && path == NULL) || LF_ISSET(DB_MPOOL_PRIVATE);
65*0Sstevel@tonic-gate 
66*0Sstevel@tonic-gate 	/*
67*0Sstevel@tonic-gate 	 * Map in the region.  We do locking regardless, as portions of it are
68*0Sstevel@tonic-gate 	 * implemented in common code (if we put the region in a file, that is).
69*0Sstevel@tonic-gate 	 */
70*0Sstevel@tonic-gate 	F_SET(dbmp, MP_LOCKREGION);
71*0Sstevel@tonic-gate 	if ((ret = __memp_ropen(dbmp,
72*0Sstevel@tonic-gate 	    path, cachesize, mode, is_private, LF_ISSET(DB_CREATE))) != 0)
73*0Sstevel@tonic-gate 		goto err;
74*0Sstevel@tonic-gate 	F_CLR(dbmp, MP_LOCKREGION);
75*0Sstevel@tonic-gate 
76*0Sstevel@tonic-gate 	/*
77*0Sstevel@tonic-gate 	 * If there's concurrent access, then we have to lock the region.
78*0Sstevel@tonic-gate 	 * If it's threaded, then we have to lock both the handles and the
79*0Sstevel@tonic-gate 	 * region, and we need to allocate a mutex for that purpose.
80*0Sstevel@tonic-gate 	 */
81*0Sstevel@tonic-gate 	if (!is_private)
82*0Sstevel@tonic-gate 		F_SET(dbmp, MP_LOCKREGION);
83*0Sstevel@tonic-gate 	if (LF_ISSET(DB_THREAD)) {
84*0Sstevel@tonic-gate 		F_SET(dbmp, MP_LOCKHANDLE | MP_LOCKREGION);
85*0Sstevel@tonic-gate 		LOCKREGION(dbmp);
86*0Sstevel@tonic-gate 		ret = __memp_alloc(dbmp,
87*0Sstevel@tonic-gate 		    sizeof(db_mutex_t), NULL, &dbmp->mutexp);
88*0Sstevel@tonic-gate 		UNLOCKREGION(dbmp);
89*0Sstevel@tonic-gate 		if (ret != 0) {
90*0Sstevel@tonic-gate 			(void)memp_close(dbmp);
91*0Sstevel@tonic-gate 			goto err;
92*0Sstevel@tonic-gate 		}
93*0Sstevel@tonic-gate 		LOCKINIT(dbmp, dbmp->mutexp);
94*0Sstevel@tonic-gate 	}
95*0Sstevel@tonic-gate 
96*0Sstevel@tonic-gate 	*retp = dbmp;
97*0Sstevel@tonic-gate 	return (0);
98*0Sstevel@tonic-gate 
99*0Sstevel@tonic-gate err:	if (dbmp != NULL)
100*0Sstevel@tonic-gate 		__os_free(dbmp, sizeof(DB_MPOOL));
101*0Sstevel@tonic-gate 	return (ret);
102*0Sstevel@tonic-gate }
103*0Sstevel@tonic-gate 
104*0Sstevel@tonic-gate /*
105*0Sstevel@tonic-gate  * memp_close --
106*0Sstevel@tonic-gate  *	Close a memory pool.
107*0Sstevel@tonic-gate  */
108*0Sstevel@tonic-gate int
memp_close(dbmp)109*0Sstevel@tonic-gate memp_close(dbmp)
110*0Sstevel@tonic-gate 	DB_MPOOL *dbmp;
111*0Sstevel@tonic-gate {
112*0Sstevel@tonic-gate 	DB_MPOOLFILE *dbmfp;
113*0Sstevel@tonic-gate 	DB_MPREG *mpreg;
114*0Sstevel@tonic-gate 	int ret, t_ret;
115*0Sstevel@tonic-gate 
116*0Sstevel@tonic-gate 	ret = 0;
117*0Sstevel@tonic-gate 
118*0Sstevel@tonic-gate 	MP_PANIC_CHECK(dbmp);
119*0Sstevel@tonic-gate 
120*0Sstevel@tonic-gate 	/* Discard DB_MPREGs. */
121*0Sstevel@tonic-gate 	while ((mpreg = LIST_FIRST(&dbmp->dbregq)) != NULL) {
122*0Sstevel@tonic-gate 		LIST_REMOVE(mpreg, q);
123*0Sstevel@tonic-gate 		__os_free(mpreg, sizeof(DB_MPREG));
124*0Sstevel@tonic-gate 	}
125*0Sstevel@tonic-gate 
126*0Sstevel@tonic-gate 	/* Discard DB_MPOOLFILEs. */
127*0Sstevel@tonic-gate 	while ((dbmfp = TAILQ_FIRST(&dbmp->dbmfq)) != NULL)
128*0Sstevel@tonic-gate 		if ((t_ret = memp_fclose(dbmfp)) != 0 && ret == 0)
129*0Sstevel@tonic-gate 			ret = t_ret;
130*0Sstevel@tonic-gate 
131*0Sstevel@tonic-gate 	/* Discard thread mutex. */
132*0Sstevel@tonic-gate 	if (F_ISSET(dbmp, MP_LOCKHANDLE)) {
133*0Sstevel@tonic-gate 		LOCKREGION(dbmp);
134*0Sstevel@tonic-gate 		__db_shalloc_free(dbmp->addr, dbmp->mutexp);
135*0Sstevel@tonic-gate 		UNLOCKREGION(dbmp);
136*0Sstevel@tonic-gate 	}
137*0Sstevel@tonic-gate 
138*0Sstevel@tonic-gate 	/* Close the region. */
139*0Sstevel@tonic-gate 	if ((t_ret = __db_rdetach(&dbmp->reginfo)) != 0 && ret == 0)
140*0Sstevel@tonic-gate 		ret = t_ret;
141*0Sstevel@tonic-gate 
142*0Sstevel@tonic-gate 	if (dbmp->reginfo.path != NULL)
143*0Sstevel@tonic-gate 		__os_freestr(dbmp->reginfo.path);
144*0Sstevel@tonic-gate 	__os_free(dbmp, sizeof(DB_MPOOL));
145*0Sstevel@tonic-gate 
146*0Sstevel@tonic-gate 	return (ret);
147*0Sstevel@tonic-gate }
148*0Sstevel@tonic-gate 
149*0Sstevel@tonic-gate /*
150*0Sstevel@tonic-gate  * __memp_panic --
151*0Sstevel@tonic-gate  *	Panic a memory pool.
152*0Sstevel@tonic-gate  *
153*0Sstevel@tonic-gate  * PUBLIC: void __memp_panic __P((DB_ENV *));
154*0Sstevel@tonic-gate  */
155*0Sstevel@tonic-gate void
__memp_panic(dbenv)156*0Sstevel@tonic-gate __memp_panic(dbenv)
157*0Sstevel@tonic-gate 	DB_ENV *dbenv;
158*0Sstevel@tonic-gate {
159*0Sstevel@tonic-gate 	if (dbenv->mp_info != NULL)
160*0Sstevel@tonic-gate 		dbenv->mp_info->mp->rlayout.panic = 1;
161*0Sstevel@tonic-gate }
162*0Sstevel@tonic-gate 
163*0Sstevel@tonic-gate /*
164*0Sstevel@tonic-gate  * memp_unlink --
165*0Sstevel@tonic-gate  *	Exit a memory pool.
166*0Sstevel@tonic-gate  */
167*0Sstevel@tonic-gate int
memp_unlink(path,force,dbenv)168*0Sstevel@tonic-gate memp_unlink(path, force, dbenv)
169*0Sstevel@tonic-gate 	const char *path;
170*0Sstevel@tonic-gate 	int force;
171*0Sstevel@tonic-gate 	DB_ENV *dbenv;
172*0Sstevel@tonic-gate {
173*0Sstevel@tonic-gate 	REGINFO reginfo;
174*0Sstevel@tonic-gate 	int ret;
175*0Sstevel@tonic-gate 
176*0Sstevel@tonic-gate 	memset(&reginfo, 0, sizeof(reginfo));
177*0Sstevel@tonic-gate 	reginfo.dbenv = dbenv;
178*0Sstevel@tonic-gate 	reginfo.appname = DB_APP_NONE;
179*0Sstevel@tonic-gate 	if (path != NULL && (ret = __os_strdup(path, &reginfo.path)) != 0)
180*0Sstevel@tonic-gate 		return (ret);
181*0Sstevel@tonic-gate 	reginfo.file = DB_DEFAULT_MPOOL_FILE;
182*0Sstevel@tonic-gate 	ret = __db_runlink(&reginfo, force);
183*0Sstevel@tonic-gate 	if (reginfo.path != NULL)
184*0Sstevel@tonic-gate 		__os_freestr(reginfo.path);
185*0Sstevel@tonic-gate 	return (ret);
186*0Sstevel@tonic-gate }
187*0Sstevel@tonic-gate 
188*0Sstevel@tonic-gate /*
189*0Sstevel@tonic-gate  * memp_register --
190*0Sstevel@tonic-gate  *	Register a file type's pgin, pgout routines.
191*0Sstevel@tonic-gate  */
192*0Sstevel@tonic-gate int
memp_register(dbmp,ftype,pgin,pgout)193*0Sstevel@tonic-gate memp_register(dbmp, ftype, pgin, pgout)
194*0Sstevel@tonic-gate 	DB_MPOOL *dbmp;
195*0Sstevel@tonic-gate 	int ftype;
196*0Sstevel@tonic-gate 	int (*pgin) __P((db_pgno_t, void *, DBT *));
197*0Sstevel@tonic-gate 	int (*pgout) __P((db_pgno_t, void *, DBT *));
198*0Sstevel@tonic-gate {
199*0Sstevel@tonic-gate 	DB_MPREG *mpr;
200*0Sstevel@tonic-gate 	int ret;
201*0Sstevel@tonic-gate 
202*0Sstevel@tonic-gate 	MP_PANIC_CHECK(dbmp);
203*0Sstevel@tonic-gate 
204*0Sstevel@tonic-gate 	if ((ret = __os_malloc(sizeof(DB_MPREG), NULL, &mpr)) != 0)
205*0Sstevel@tonic-gate 		return (ret);
206*0Sstevel@tonic-gate 
207*0Sstevel@tonic-gate 	mpr->ftype = ftype;
208*0Sstevel@tonic-gate 	mpr->pgin = pgin;
209*0Sstevel@tonic-gate 	mpr->pgout = pgout;
210*0Sstevel@tonic-gate 
211*0Sstevel@tonic-gate 	/*
212*0Sstevel@tonic-gate 	 * Insert at the head.  Because we do a linear walk, we'll find
213*0Sstevel@tonic-gate 	 * the most recent registry in the case of multiple entries, so
214*0Sstevel@tonic-gate 	 * we don't have to check for multiple registries.
215*0Sstevel@tonic-gate 	 */
216*0Sstevel@tonic-gate 	LOCKHANDLE(dbmp, dbmp->mutexp);
217*0Sstevel@tonic-gate 	LIST_INSERT_HEAD(&dbmp->dbregq, mpr, q);
218*0Sstevel@tonic-gate 	UNLOCKHANDLE(dbmp, dbmp->mutexp);
219*0Sstevel@tonic-gate 
220*0Sstevel@tonic-gate 	return (0);
221*0Sstevel@tonic-gate }
222