69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/****************************************************************
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* *
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* Copyright 2001, 2013 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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/* disk_block_available(int fd, int4 *ret, booleat_t fill_unix_holes)
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* parameter:
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* fd: file descriptor of the file that is located
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* on the disk being examined
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* *ret: address to put the number of available blocks
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* fill_unix_holes
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* TRUE ==> the calculation takes the
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* hole in this file into consideration
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* FALSE ==> plain system service
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* return:
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* 0: upon successful completion, the number of available
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* blocks is put to ret.
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* errno: as to why the request failed.
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* note that DISK_BLOCK_SIZE is used here instead of GDS_BLOCK_SIZE,
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* this is due to the intension to make this routine more general
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*/
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#include "mdef.h"
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#include <errno.h>
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#include "gtm_unistd.h"
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#include "gtm_stat.h"
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#include "gtm_statvfs.h"
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#ifndef __MVS__
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#if !defined(sun) && !defined(__CYGWIN__)
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#include <sys/dir.h>
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#endif
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#include <sys/param.h>
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#else
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#define DEV_BSIZE fstat_buf.st_blksize
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#endif
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#include "have_crit.h"
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#include "eintr_wrappers.h"
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#include "disk_block_available.h"
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int4 disk_block_available(int fd, gtm_uint64_t *ret, boolean_t fill_unix_holes)
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{
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struct stat fstat_buf;
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struct statvfs fstatvfs_buf;
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int status;
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FSTATVFS_FILE(fd, &fstatvfs_buf, status);
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if (-1 == status)
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return errno;
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*ret = (gtm_uint64_t)((fstatvfs_buf.f_frsize / DISK_BLOCK_SIZE) * fstatvfs_buf.f_bavail);
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if (fill_unix_holes)
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{
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FSTAT_FILE(fd, &fstat_buf, status);
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if (-1 == status)
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return errno;
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*ret -= (gtm_uint64_t)(DEV_BSIZE / DISK_BLOCK_SIZE
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* (DIVIDE_ROUND_UP(fstat_buf.st_size, DEV_BSIZE) - fstat_buf.st_blocks));
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}
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return 0;
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}
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