NetBSD-5.0.2/sys/compat/common/vfs_syscalls_20.c
/* $NetBSD: vfs_syscalls_20.c,v 1.31 2008/06/24 11:18:15 ad Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_20.c,v 1.31 2008/06/24 11:18:15 ad Exp $");
#include "opt_compat_netbsd.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/filedesc.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/sysctl.h>
#include <sys/syscallargs.h>
#include <sys/kauth.h>
#include <compat/sys/mount.h>
#ifdef COMPAT_09
#define MOUNTNO_NONE 0
#define MOUNTNO_UFS 1 /* UNIX "Fast" Filesystem */
#define MOUNTNO_NFS 2 /* Network Filesystem */
#define MOUNTNO_MFS 3 /* Memory Filesystem */
#define MOUNTNO_MSDOS 4 /* MSDOS Filesystem */
#define MOUNTNO_CD9660 5 /* iso9660 cdrom */
#define MOUNTNO_FDESC 6 /* /dev/fd filesystem */
#define MOUNTNO_KERNFS 7 /* kernel variable filesystem */
#define MOUNTNO_DEVFS 8 /* device node filesystem */
#define MOUNTNO_AFS 9 /* AFS 3.x */
static const struct {
const char *name;
const int value;
} nv[] = {
{ MOUNT_UFS, MOUNTNO_UFS },
{ MOUNT_NFS, MOUNTNO_NFS },
{ MOUNT_MFS, MOUNTNO_MFS },
{ MOUNT_MSDOS, MOUNTNO_MSDOS },
{ MOUNT_CD9660, MOUNTNO_CD9660 },
{ MOUNT_FDESC, MOUNTNO_FDESC },
{ MOUNT_KERNFS, MOUNTNO_KERNFS },
{ MOUNT_AFS, MOUNTNO_AFS },
};
#endif
static int
vfs2fs(struct statfs12 *bfs, const struct statvfs *fs)
{
struct statfs12 ofs;
#ifdef COMPAT_09
int i = 0;
ofs.f_type = 0;
ofs.f_oflags = (short)fs->f_flag;
for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) {
if (strcmp(nv[i].name, fs->f_fstypename) == 0) {
ofs.f_type = nv[i].value;
break;
}
}
#else
ofs.f_type = 0;
#endif
#define CLAMP(a) (long)(((a) & ~LONG_MAX) ? LONG_MAX : (a))
ofs.f_bsize = CLAMP(fs->f_frsize);
ofs.f_iosize = CLAMP(fs->f_iosize);
ofs.f_blocks = CLAMP(fs->f_blocks);
ofs.f_bfree = CLAMP(fs->f_bfree);
if (fs->f_bfree > fs->f_bresvd)
ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd);
else
ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree);
ofs.f_files = CLAMP(fs->f_files);
ofs.f_ffree = CLAMP(fs->f_ffree);
ofs.f_fsid = fs->f_fsidx;
ofs.f_owner = fs->f_owner;
ofs.f_flags = (long)fs->f_flag;
ofs.f_syncwrites = CLAMP(fs->f_syncwrites);
ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites);
(void)strncpy(ofs.f_fstypename, fs->f_fstypename,
sizeof(ofs.f_fstypename));
(void)strncpy(ofs.f_mntonname, fs->f_mntonname,
sizeof(ofs.f_mntonname));
(void)strncpy(ofs.f_mntfromname, fs->f_mntfromname,
sizeof(ofs.f_mntfromname));
return copyout(&ofs, bfs, sizeof(ofs));
}
/*
* Get filesystem statistics.
*/
/* ARGSUSED */
int
compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval)
{
/* {
syscallarg(const char *) path;
syscallarg(struct statfs12 *) buf;
} */
struct mount *mp;
struct statvfs *sbuf;
int error = 0;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE,
SCARG(uap, path));
if ((error = namei(&nd)) != 0)
return error;
mp = nd.ni_vp->v_mount;
sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
goto done;
error = vfs2fs(SCARG(uap, buf), sbuf);
done:
vrele(nd.ni_vp);
free(sbuf, M_TEMP);
return error;
}
/*
* Get filesystem statistics.
*/
/* ARGSUSED */
int
compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval)
{
/* {
syscallarg(int) fd;
syscallarg(struct statfs12 *) buf;
} */
struct file *fp;
struct mount *mp;
struct statvfs *sbuf;
int error;
/* fd_getvnode() will use the descriptor for us */
if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
return (error);
mp = ((struct vnode *)fp->f_data)->v_mount;
sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
goto out;
error = vfs2fs(SCARG(uap, buf), sbuf);
out:
fd_putfile(SCARG(uap, fd));
free(sbuf, M_TEMP);
return error;
}
/*
* Get statistics on all filesystems.
*/
int
compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval)
{
/* {
syscallarg(struct statfs12 *) buf;
syscallarg(long) bufsize;
syscallarg(int) flags;
} */
int root = 0;
struct mount *mp, *nmp;
struct statvfs *sbuf;
struct statfs12 *sfsp;
size_t count, maxcount;
int error = 0;
sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12);
sfsp = SCARG(uap, buf);
mutex_enter(&mountlist_lock);
count = 0;
for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
mp = nmp) {
if (vfs_busy(mp, &nmp)) {
continue;
}
if (sfsp && count < maxcount) {
error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0);
if (error) {
vfs_unbusy(mp, false, &nmp);
continue;
}
error = vfs2fs(sfsp, sbuf);
if (error) {
vfs_unbusy(mp, false, NULL);
goto out;
}
sfsp++;
root |= strcmp(sbuf->f_mntonname, "/") == 0;
}
count++;
vfs_unbusy(mp, false, &nmp);
}
mutex_exit(&mountlist_lock);
if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) {
/*
* fake a root entry
*/
if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount,
sbuf, l, SCARG(uap, flags), 1)) != 0)
goto out;
if (sfsp)
error = vfs2fs(sfsp, sbuf);
count++;
}
if (sfsp && count > maxcount)
*retval = maxcount;
else
*retval = count;
out:
free(sbuf, M_TEMP);
return error;
}
int
compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval)
{
/* {
syscallarg(const struct compat_30_fhandle *) fhp;
syscallarg(struct statfs12 *) buf;
} */
struct statvfs *sbuf;
struct compat_30_fhandle fh;
struct mount *mp;
struct vnode *vp;
int error;
/*
* Must be super user
*/
if ((error = kauth_authorize_system(l->l_cred,
KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL)))
return (error);
if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0)
return (error);
if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
return (ESTALE);
if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp)))
return (error);
mp = vp->v_mount;
VOP_UNLOCK(vp, 0);
sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
if ((error = VFS_STATVFS(mp, sbuf)) != 0)
goto out;
error = vfs2fs(SCARG(uap, buf), sbuf);
out:
vrele(vp);
free(sbuf, M_TEMP);
return error;
}