mp_fset.c
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上传日期:2022-05-23
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文件大小:2k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: mp_fset.c,v 11.25 2002/05/03 15:21:17 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #endif
- #include "db_int.h"
- #include "dbinc/db_shash.h"
- #include "dbinc/mp.h"
- /*
- * __memp_fset --
- * Mpool page set-flag routine.
- *
- * PUBLIC: int __memp_fset __P((DB_MPOOLFILE *, void *, u_int32_t));
- */
- int
- __memp_fset(dbmfp, pgaddr, flags)
- DB_MPOOLFILE *dbmfp;
- void *pgaddr;
- u_int32_t flags;
- {
- BH *bhp;
- DB_ENV *dbenv;
- DB_MPOOL *dbmp;
- DB_MPOOL_HASH *hp;
- MPOOL *c_mp;
- u_int32_t n_cache;
- int ret;
- dbmp = dbmfp->dbmp;
- dbenv = dbmp->dbenv;
- PANIC_CHECK(dbenv);
- /* Validate arguments. */
- if (flags == 0)
- return (__db_ferr(dbenv, "memp_fset", 1));
- if ((ret = __db_fchk(dbenv, "memp_fset", flags,
- DB_MPOOL_CLEAN | DB_MPOOL_DIRTY | DB_MPOOL_DISCARD)) != 0)
- return (ret);
- if ((ret = __db_fcchk(dbenv, "memp_fset",
- flags, DB_MPOOL_CLEAN, DB_MPOOL_DIRTY)) != 0)
- return (ret);
- if (LF_ISSET(DB_MPOOL_DIRTY) && F_ISSET(dbmfp, MP_READONLY)) {
- __db_err(dbenv, "%s: dirty flag set for readonly file page",
- __memp_fn(dbmfp));
- return (EACCES);
- }
- /* Convert the page address to a buffer header and hash bucket. */
- bhp = (BH *)((u_int8_t *)pgaddr - SSZA(BH, buf));
- n_cache = NCACHE(dbmp->reginfo[0].primary, bhp->mf_offset, bhp->pgno);
- c_mp = dbmp->reginfo[n_cache].primary;
- hp = R_ADDR(&dbmp->reginfo[n_cache], c_mp->htab);
- hp = &hp[NBUCKET(c_mp, bhp->mf_offset, bhp->pgno)];
- MUTEX_LOCK(dbenv, &hp->hash_mutex);
- /* Set/clear the page bits. */
- if (LF_ISSET(DB_MPOOL_CLEAN) &&
- F_ISSET(bhp, BH_DIRTY) && !F_ISSET(bhp, BH_DIRTY_CREATE)) {
- DB_ASSERT(hp->hash_page_dirty != 0);
- --hp->hash_page_dirty;
- F_CLR(bhp, BH_DIRTY);
- }
- if (LF_ISSET(DB_MPOOL_DIRTY) && !F_ISSET(bhp, BH_DIRTY)) {
- ++hp->hash_page_dirty;
- F_SET(bhp, BH_DIRTY);
- }
- if (LF_ISSET(DB_MPOOL_DISCARD))
- F_SET(bhp, BH_DISCARD);
- MUTEX_UNLOCK(dbenv, &hp->hash_mutex);
- return (0);
- }