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/*-
* 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_fopen.c 10.27 (Sleepycat) 9/23/97";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#endif
#include "db_int.h"
#include "shqueue.h"
#include "db_shash.h"
#include "mp.h"
#include "common_ext.h"
static int __memp_mf_close __P((DB_MPOOL *, DB_MPOOLFILE *));
static int __memp_mf_open __P((DB_MPOOL *,
DB_MPOOLFILE *, int, size_t, int, DBT *, u_int8_t *, int, MPOOLFILE **));
/*
* memp_fopen --
* Open a backing file for the memory pool.
*/
int
memp_fopen(dbmp, path, ftype,
flags, mode, pagesize, lsn_offset, pgcookie, fileid, retp)
DB_MPOOL *dbmp;
const char *path;
int ftype, flags, mode, lsn_offset;
size_t pagesize;
DBT *pgcookie;
u_int8_t *fileid;
DB_MPOOLFILE **retp;
{
int ret;
/* Validate arguments. */
if ((ret = __db_fchk(dbmp->dbenv,
"memp_fopen", flags, DB_CREATE | DB_NOMMAP | DB_RDONLY)) != 0)
return (ret);
return (__memp_fopen(dbmp, path, ftype,
flags, mode, pagesize, lsn_offset, pgcookie, fileid, 1, retp));
}
/*
* __memp_fopen --
* Open a backing file for the memory pool; internal version.
*
* PUBLIC: int __memp_fopen __P((DB_MPOOL *, const char *, int, int,
* PUBLIC: int, size_t, int, DBT *, u_int8_t *, int, DB_MPOOLFILE **));
*/
int
__memp_fopen(dbmp, path,
ftype, flags, mode, pagesize, lsn_offset, pgcookie, fileid, needlock, retp)
DB_MPOOL *dbmp;
const char *path;
int ftype, flags, mode, lsn_offset, needlock;
size_t pagesize;
DBT *pgcookie;
u_int8_t *fileid;
DB_MPOOLFILE **retp;
{
DB_ENV *dbenv;
DB_MPOOLFILE *dbmfp;
MPOOLFILE *mfp;
off_t size;
int ret;
dbenv = dbmp->dbenv;
ret = 0;
/* Require a non-zero pagesize. */
if (pagesize == 0) {
__db_err(dbenv, "memp_fopen: pagesize not specified");
return (EINVAL);
}
/* Allocate and initialize the per-process structure. */
if ((dbmfp =
(DB_MPOOLFILE *)calloc(1, sizeof(DB_MPOOLFILE))) == NULL) {
__db_err(dbenv, "%s: %s",
path == NULL ? TEMPORARY : path, strerror(ENOMEM));
return (ENOMEM);
}
dbmfp->dbmp = dbmp;
dbmfp->fd = -1;
if (LF_ISSET(DB_RDONLY))
F_SET(dbmfp, MP_READONLY);
if (path == NULL) {
if (LF_ISSET(DB_RDONLY)) {
__db_err(dbenv,
"memp_fopen: temporary files can't be readonly");
ret = EINVAL;
goto err;
}
dbmfp->path = (char *)TEMPORARY;
F_SET(dbmfp, MP_PATH_TEMP);
} else {
/* Calculate the real name for this file. */
if ((ret = __db_appname(dbenv,
DB_APP_DATA, NULL, path, NULL, &dbmfp->path)) != 0)
goto err;
F_SET(dbmfp, MP_PATH_ALLOC);
/* Open the file. */
if ((ret = __db_fdopen(dbmfp->path,
LF_ISSET(DB_CREATE | DB_RDONLY), DB_CREATE | DB_RDONLY,
mode, &dbmfp->fd)) != 0) {
__db_err(dbenv, "%s: %s", dbmfp->path, strerror(ret));
goto err;
}
/* Don't permit files that aren't a multiple of the pagesize. */
if ((ret = __db_stat(dbenv,
dbmfp->path, dbmfp->fd, &size, NULL)) != 0)
goto err;
if (size % pagesize) {
__db_err(dbenv,
"%s: file size not a multiple of the pagesize",
dbmfp->path);
ret = EINVAL;
goto err;
}
}
/*
* Find/allocate the shared file objects. This includes allocating
* space for the per-process thread lock.
*/
if (needlock)
LOCKREGION(dbmp);
ret = __memp_mf_open(dbmp, dbmfp, ftype, pagesize,
lsn_offset, pgcookie, fileid, F_ISSET(dbmfp, MP_PATH_TEMP), &mfp);
if (ret == 0 &&
F_ISSET(dbmp, MP_LOCKHANDLE) && (ret =
__memp_ralloc(dbmp, sizeof(db_mutex_t), NULL, &dbmfp->mutexp)) == 0)
LOCKINIT(dbmp, dbmfp->mutexp);
if (needlock)
UNLOCKREGION(dbmp);
if (ret != 0)
goto err;
dbmfp->mfp = mfp;
/*
* If a file:
* + is read-only
* + isn't temporary
* + doesn't require any pgin/pgout support
* + the DB_NOMMAP flag wasn't set
* + and is less than mp_mmapsize bytes in size
*
* we can mmap it instead of reading/writing buffers. Don't do error
* checking based on the mmap call failure. We want to do normal I/O
* on the file if the reason we failed was because the file was on an
* NFS mounted partition, and we can fail in buffer I/O just as easily
* as here.
*
* XXX
* We'd like to test to see if the file is too big to mmap. Since we
* don't know what size or type off_t's or size_t's are, or the largest
* unsigned integral type is, or what random insanity the local C
* compiler will perpetrate, doing the comparison in a portable way is
* flatly impossible. Hope that mmap fails if the file is too large.
*/
#define DB_MAXMMAPSIZE (10 * 1024 * 1024) /* 10 Mb. */
if (mfp->can_mmap) {
if (!F_ISSET(dbmfp, MP_READONLY))
mfp->can_mmap = 0;
if (path == NULL)
mfp->can_mmap = 0;
if (ftype != 0)
mfp->can_mmap = 0;
if (LF_ISSET(DB_NOMMAP))
mfp->can_mmap = 0;
if (size > (dbenv == NULL || dbenv->mp_mmapsize == 0 ?
DB_MAXMMAPSIZE : (off_t)dbenv->mp_mmapsize))
mfp->can_mmap = 0;
}
dbmfp->addr = NULL;
if (mfp->can_mmap) {
dbmfp->len = size;
if (__db_mmap(dbmfp->fd, dbmfp->len, 1, 1, &dbmfp->addr) != 0) {
mfp->can_mmap = 0;
dbmfp->addr = NULL;
}
}
LOCKHANDLE(dbmp, dbmp->mutexp);
TAILQ_INSERT_TAIL(&dbmp->dbmfq, dbmfp, q);
UNLOCKHANDLE(dbmp, dbmp->mutexp);
*retp = dbmfp;
return (0);
err: /*
* Note that we do not have to free the thread mutex, because we
* never get to here after we have successfully allocated it.
*/
if (F_ISSET(dbmfp, MP_PATH_ALLOC))
FREES(dbmfp->path);
if (dbmfp->fd != -1)
(void)__db_close(dbmfp->fd);
if (dbmfp != NULL)
FREE(dbmfp, sizeof(DB_MPOOLFILE));
return (ret);
}
/*
* __memp_mf_open --
* Open an MPOOLFILE.
*/
static int
__memp_mf_open(dbmp, dbmfp,
ftype, pagesize, lsn_offset, pgcookie, fileid, istemp, retp)
DB_MPOOL *dbmp;
DB_MPOOLFILE *dbmfp;
int ftype, lsn_offset, istemp;
size_t pagesize;
DBT *pgcookie;
u_int8_t *fileid;
MPOOLFILE **retp;
{
MPOOLFILE *mfp;
int ret;
u_int8_t idbuf[DB_FILE_ID_LEN];
void *p;
/* Temporary files can't match previous files. */
if (istemp)
goto alloc;
/*
* Get the file id if we weren't give one. Generated file id's don't
* use timestamps, otherwise there'd be no chance of anyone joining
* the party.
*/
if (fileid == NULL) {
if ((ret =
__db_fileid(dbmp->dbenv, dbmfp->path, 0, idbuf)) != 0)
return (ret);
fileid = idbuf;
}
/* Walk the list of MPOOLFILE's, looking for a matching file. */
for (mfp = SH_TAILQ_FIRST(&dbmp->mp->mpfq, __mpoolfile);
mfp != NULL; mfp = SH_TAILQ_NEXT(mfp, q, __mpoolfile))
if (!memcmp(fileid,
ADDR(dbmp, mfp->fileid_off), DB_FILE_ID_LEN)) {
if (ftype != mfp->ftype ||
pagesize != mfp->stat.st_pagesize) {
__db_err(dbmp->dbenv,
"%s: ftype or pagesize changed",
dbmfp->path);
ret = EINVAL;
mfp = NULL;
goto ret1;
}
/* Found it: increment the reference count. */
++mfp->ref;
goto ret1;
}
/* Allocate a new MPOOLFILE. */
alloc: if ((ret = __memp_ralloc(dbmp, sizeof(MPOOLFILE), NULL, &mfp)) != 0)
goto ret1;
/* Initialize the structure. */
memset(mfp, 0, sizeof(MPOOLFILE));
mfp->ref = 1;
mfp->ftype = ftype;
mfp->can_mmap = 1;
mfp->lsn_off = lsn_offset;
mfp->stat.st_pagesize = pagesize;
/* Copy the file path into shared memory. */
if ((ret = __memp_ralloc(dbmp,
strlen(dbmfp->path) + 1, &mfp->path_off, &p)) != 0)
goto err;
memcpy(p, dbmfp->path, strlen(dbmfp->path) + 1);
/* Copy the file identification string into shared memory. */
if (istemp)
mfp->fileid_off = 0;
else {
if ((ret = __memp_ralloc(dbmp,
DB_FILE_ID_LEN, &mfp->fileid_off, &p)) != 0)
goto err;
memcpy(p, fileid, DB_FILE_ID_LEN);
}
/* Copy the page cookie into shared memory. */
if (pgcookie == NULL || pgcookie->size == 0) {
mfp->pgcookie_len = 0;
mfp->pgcookie_off = 0;
} else {
if ((ret = __memp_ralloc(dbmp,
pgcookie->size, &mfp->pgcookie_off, &p)) != 0)
goto err;
memcpy(p, pgcookie->data, pgcookie->size);
mfp->pgcookie_len = pgcookie->size;
}
/* Prepend the MPOOLFILE to the list of MPOOLFILE's. */
SH_TAILQ_INSERT_HEAD(&dbmp->mp->mpfq, mfp, q, __mpoolfile);
if (0) {
err: if (mfp->path_off != 0)
__db_shalloc_free(dbmp->addr,
ADDR(dbmp, mfp->path_off));
if (!istemp)
__db_shalloc_free(dbmp->addr,
ADDR(dbmp, mfp->fileid_off));
if (mfp != NULL)
__db_shalloc_free(dbmp->addr, mfp);
mfp = NULL;
}
ret1: *retp = mfp;
return (0);
}
/*
* memp_fclose --
* Close a backing file for the memory pool.
*/
int
memp_fclose(dbmfp)
DB_MPOOLFILE *dbmfp;
{
DB_MPOOL *dbmp;
int ret, t_ret;
dbmp = dbmfp->dbmp;
ret = 0;
/* Complain if pinned blocks never returned. */
if (dbmfp->pinref != 0)
__db_err(dbmp->dbenv, "%s: close: %lu blocks left pinned",
dbmfp->path, (u_long)dbmfp->pinref);
/* Remove the DB_MPOOLFILE structure from the list. */
LOCKHANDLE(dbmp, dbmp->mutexp);
TAILQ_REMOVE(&dbmp->dbmfq, dbmfp, q);
UNLOCKHANDLE(dbmp, dbmp->mutexp);
/* Close the underlying MPOOLFILE. */
(void)__memp_mf_close(dbmp, dbmfp);
/* Discard any mmap information. */
if (dbmfp->addr != NULL &&
(ret = __db_munmap(dbmfp->addr, dbmfp->len)) != 0)
__db_err(dbmp->dbenv, "%s: %s", dbmfp->path, strerror(ret));
/* Close the file; temporary files may not yet have been created. */
if (dbmfp->fd != -1 && (t_ret = __db_close(dbmfp->fd)) != 0) {
__db_err(dbmp->dbenv, "%s: %s", dbmfp->path, strerror(t_ret));
if (ret != 0)
t_ret = ret;
}
/* Free memory. */
if (F_ISSET(dbmfp, MP_PATH_ALLOC))
FREES(dbmfp->path);
if (dbmfp->mutexp != NULL) {
LOCKREGION(dbmp);
__db_shalloc_free(dbmp->addr, dbmfp->mutexp);
UNLOCKREGION(dbmp);
}
/* Discard the DB_MPOOLFILE structure. */
FREE(dbmfp, sizeof(DB_MPOOLFILE));
return (ret);
}
/*
* __memp_mf_close --
* Close down an MPOOLFILE.
*/
static int
__memp_mf_close(dbmp, dbmfp)
DB_MPOOL *dbmp;
DB_MPOOLFILE *dbmfp;
{
BH *bhp, *nbhp;
MPOOL *mp;
MPOOLFILE *mfp;
size_t mf_offset;
mp = dbmp->mp;
mfp = dbmfp->mfp;
LOCKREGION(dbmp);
/* If more than a single reference, simply decrement. */
if (mfp->ref > 1) {
--mfp->ref;
goto ret1;
}
/*
* Move any BH's held by the file to the free list. We don't free the
* memory itself because we may be discarding the memory pool, and it's
* fairly expensive to reintegrate the buffers back into the region for
* no purpose.
*/
mf_offset = OFFSET(dbmp, mfp);
for (bhp = SH_TAILQ_FIRST(&mp->bhq, __bh); bhp != NULL; bhp = nbhp) {
nbhp = SH_TAILQ_NEXT(bhp, q, __bh);
#ifdef DEBUG_NO_DIRTY
/* Complain if we find any blocks that were left dirty. */
if (F_ISSET(bhp, BH_DIRTY))
__db_err(dbmp->dbenv,
"%s: close: pgno %lu left dirty; ref %lu",
dbmfp->path, (u_long)bhp->pgno, (u_long)bhp->ref);
#endif
if (bhp->mf_offset == mf_offset) {
__memp_bhfree(dbmp, mfp, bhp, 0);
SH_TAILQ_INSERT_HEAD(&mp->bhfq, bhp, q, __bh);
}
}
/* Delete from the list of MPOOLFILEs. */
SH_TAILQ_REMOVE(&mp->mpfq, mfp, q, __mpoolfile);
/* Free the space. */
__db_shalloc_free(dbmp->addr, mfp);
__db_shalloc_free(dbmp->addr, ADDR(dbmp, mfp->path_off));
if (mfp->fileid_off != 0)
__db_shalloc_free(dbmp->addr, ADDR(dbmp, mfp->fileid_off));
if (mfp->pgcookie_off != 0)
__db_shalloc_free(dbmp->addr, ADDR(dbmp, mfp->pgcookie_off));
ret1: UNLOCKREGION(dbmp);
return (0);
}
|