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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1998, 1999, 2000
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char revid[] = "$Id: os_finit.c,v 11.8 2000/11/30 00:58:42 ubell Exp $";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <string.h>
#endif
#include "db_int.h"
/*
* __os_finit --
* Initialize a regular file, optionally zero-filling it as well.
*
* PUBLIC: int __os_finit __P((DB_ENV *, DB_FH *, size_t, int));
*/
int
__os_finit(dbenv, fhp, size, zerofill)
DB_ENV *dbenv;
DB_FH *fhp;
size_t size;
int zerofill;
{
db_pgno_t pages;
size_t i;
size_t nw;
u_int32_t relative;
int ret;
char buf[OS_VMPAGESIZE];
/* Write nuls to the new bytes. */
memset(buf, 0, sizeof(buf));
/*
* Extend the region by writing the last page. If the region is >4Gb,
* increment may be larger than the maximum possible seek "relative"
* argument, as it's an unsigned 32-bit value. Break the offset into
* pages of 1MB each so that we don't overflow (2^20 + 2^32 is bigger
* than any memory I expect to see for awhile).
*/
if ((ret = __os_seek(dbenv, fhp, 0, 0, 0, 0, DB_OS_SEEK_END)) != 0)
return (ret);
pages = (size - OS_VMPAGESIZE) / MEGABYTE;
relative = (size - OS_VMPAGESIZE) % MEGABYTE;
if ((ret = __os_seek(dbenv,
fhp, MEGABYTE, pages, relative, 0, DB_OS_SEEK_CUR)) != 0)
return (ret);
if ((ret = __os_write(dbenv, fhp, buf, sizeof(buf), &nw)) != 0)
return (ret);
if (nw != sizeof(buf))
return (EIO);
/*
* We may want to guarantee that there is enough disk space for the
* file, so we also write a byte to each page. We write the byte
* because reading it is insufficient on systems smart enough not to
* instantiate disk pages to satisfy a read (e.g., Solaris).
*/
if (zerofill) {
pages = size / MEGABYTE;
relative = size % MEGABYTE;
if ((ret = __os_seek(dbenv, fhp,
MEGABYTE, pages, relative, 1, DB_OS_SEEK_END)) != 0)
return (ret);
/* Write a byte to each page. */
for (i = 0; i < size; i += OS_VMPAGESIZE) {
if ((ret = __os_write(dbenv, fhp, buf, 1, &nw)) != 0)
return (ret);
if (nw != 1)
return (EIO);
if ((ret = __os_seek(dbenv, fhp,
0, 0, OS_VMPAGESIZE - 1, 0, DB_OS_SEEK_CUR)) != 0)
return (ret);
}
}
return (0);
}
/*
* __os_fpinit --
* Initialize a page in a regular file.
*
* PUBLIC: int __os_fpinit __P((DB_ENV *, DB_FH *, db_pgno_t, int, int));
*/
int
__os_fpinit(dbenv, fhp, pgno, pagecount, pagesize)
DB_ENV *dbenv;
DB_FH *fhp;
db_pgno_t pgno;
int pagecount, pagesize;
{
COMPQUIET(dbenv, NULL);
COMPQUIET(fhp, NULL);
COMPQUIET(pgno, 0);
COMPQUIET(pagecount, 0);
COMPQUIET(pagesize, 0);
return (0);
}
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