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give an estimation of the amount of free space

This commit is contained in:
pooka 2006-11-08 11:25:29 +00:00
parent 53056d0217
commit 05310d3a05
1 changed files with 21 additions and 6 deletions
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27
share/examples/puffs/dtfs/dtfs_vfsops.c
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@ -1,4 +1,4 @@
/* $NetBSD: dtfs_vfsops.c,v 1.1 2006/10/23 00:44:53 pooka Exp $ */
/* $NetBSD: dtfs_vfsops.c,v 1.2 2006/11/08 11:25:29 pooka Exp $ */
/*
* Copyright (c) 2006 Antti Kantee. All Rights Reserved.
@ -29,6 +29,7 @@
*/
#include <sys/types.h>
#include <sys/resource.h>
#include <err.h>
#include <puffs.h>
@ -106,22 +107,36 @@ dtfs_unmount(struct puffs_usermount *pu, int flags, pid_t pid)
* The rest are filled in by the kernel.
*/
#define ROUND(a,b) (((a) + ((b)-1)) & ~((b)-1))
#define NFILES 1024*1024
int
dtfs_statvfs(struct puffs_usermount *pu, struct statvfs *sbp, pid_t pid)
{
struct rlimit rlim;
struct dtfs_mount *dtm;
off_t btot, bfree;
int pgsize;
dtm = pu->pu_privdata;
pgsize = getpagesize();
memset(sbp, 0, sizeof(struct statvfs));
sbp->f_bsize = sbp->f_frsize = sbp->f_iosize = pgsize;
sbp->f_bfree = sbp->f_bavail = 0;
sbp->f_ffree = sbp->f_favail = 0;
/*
* Use datasize rlimit as an _approximation_ for free size.
* This, of course, is not accurate due to overhead and not
* accounting for metadata.
*/
if (getrlimit(RLIMIT_DATA, &rlim) == 0)
btot = rlim.rlim_cur;
else
btot = 16*1024*1024;
bfree = btot - dtm->dtm_fsizes;
sbp->f_blocks = ROUND(dtm->dtm_fsizes, pgsize) / pgsize;
sbp->f_files = dtm->dtm_nfiles;
sbp->f_blocks = ROUND(btot, pgsize) / pgsize;
sbp->f_files = NFILES;
sbp->f_bsize = sbp->f_frsize = sbp->f_iosize = pgsize;
sbp->f_bfree = sbp->f_bavail = ROUND(bfree, pgsize) / pgsize;
sbp->f_ffree = sbp->f_favail = NFILES - dtm->dtm_nfiles;
sbp->f_bresvd = sbp->f_fresvd = 0;