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