309 lines
8.5 KiB
C
309 lines
8.5 KiB
C
/* $NetBSD: vfs_syscalls_20.c,v 1.26 2008/03/21 21:54:58 ad Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vfs_syscalls.c 8.42 (Berkeley) 7/31/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: vfs_syscalls_20.c,v 1.26 2008/03/21 21:54:58 ad Exp $");
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#include "opt_compat_netbsd.h"
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#include "opt_compat_43.h"
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#include "fss.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/namei.h>
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#include <sys/filedesc.h>
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#include <sys/kernel.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/uio.h>
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#include <sys/malloc.h>
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#include <sys/dirent.h>
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#include <sys/sysctl.h>
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#include <sys/syscallargs.h>
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#include <sys/kauth.h>
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#include <compat/sys/mount.h>
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#ifdef COMPAT_09
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#define MOUNTNO_NONE 0
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#define MOUNTNO_UFS 1 /* UNIX "Fast" Filesystem */
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#define MOUNTNO_NFS 2 /* Network Filesystem */
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#define MOUNTNO_MFS 3 /* Memory Filesystem */
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#define MOUNTNO_MSDOS 4 /* MSDOS Filesystem */
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#define MOUNTNO_CD9660 5 /* iso9660 cdrom */
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#define MOUNTNO_FDESC 6 /* /dev/fd filesystem */
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#define MOUNTNO_KERNFS 7 /* kernel variable filesystem */
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#define MOUNTNO_DEVFS 8 /* device node filesystem */
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#define MOUNTNO_AFS 9 /* AFS 3.x */
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static const struct {
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const char *name;
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const int value;
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} nv[] = {
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{ MOUNT_UFS, MOUNTNO_UFS },
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{ MOUNT_NFS, MOUNTNO_NFS },
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{ MOUNT_MFS, MOUNTNO_MFS },
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{ MOUNT_MSDOS, MOUNTNO_MSDOS },
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{ MOUNT_CD9660, MOUNTNO_CD9660 },
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{ MOUNT_FDESC, MOUNTNO_FDESC },
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{ MOUNT_KERNFS, MOUNTNO_KERNFS },
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{ MOUNT_AFS, MOUNTNO_AFS },
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};
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#endif
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static int
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vfs2fs(struct statfs12 *bfs, const struct statvfs *fs)
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{
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struct statfs12 ofs;
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#ifdef COMPAT_09
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int i = 0;
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ofs.f_type = 0;
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ofs.f_oflags = (short)fs->f_flag;
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for (i = 0; i < sizeof(nv) / sizeof(nv[0]); i++) {
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if (strcmp(nv[i].name, fs->f_fstypename) == 0) {
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ofs.f_type = nv[i].value;
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break;
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}
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}
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#else
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ofs.f_type = 0;
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#endif
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#define CLAMP(a) (long)(((a) & ~LONG_MAX) ? LONG_MAX : (a))
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ofs.f_bsize = CLAMP(fs->f_frsize);
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ofs.f_iosize = CLAMP(fs->f_iosize);
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ofs.f_blocks = CLAMP(fs->f_blocks);
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ofs.f_bfree = CLAMP(fs->f_bfree);
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if (fs->f_bfree > fs->f_bresvd)
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ofs.f_bavail = CLAMP(fs->f_bfree - fs->f_bresvd);
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else
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ofs.f_bavail = -CLAMP(fs->f_bresvd - fs->f_bfree);
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ofs.f_files = CLAMP(fs->f_files);
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ofs.f_ffree = CLAMP(fs->f_ffree);
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ofs.f_fsid = fs->f_fsidx;
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ofs.f_owner = fs->f_owner;
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ofs.f_flags = (long)fs->f_flag;
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ofs.f_syncwrites = CLAMP(fs->f_syncwrites);
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ofs.f_asyncwrites = CLAMP(fs->f_asyncwrites);
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(void)strncpy(ofs.f_fstypename, fs->f_fstypename,
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sizeof(ofs.f_fstypename));
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(void)strncpy(ofs.f_mntonname, fs->f_mntonname,
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sizeof(ofs.f_mntonname));
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(void)strncpy(ofs.f_mntfromname, fs->f_mntfromname,
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sizeof(ofs.f_mntfromname));
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return copyout(&ofs, bfs, sizeof(ofs));
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}
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/*
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* Get filesystem statistics.
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*/
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/* ARGSUSED */
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int
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compat_20_sys_statfs(struct lwp *l, const struct compat_20_sys_statfs_args *uap, register_t *retval)
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{
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/* {
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syscallarg(const char *) path;
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syscallarg(struct statfs12 *) buf;
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} */
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struct mount *mp;
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struct statvfs *sbuf;
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int error = 0;
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struct nameidata nd;
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NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE,
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SCARG(uap, path));
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if ((error = namei(&nd)) != 0)
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return error;
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mp = nd.ni_vp->v_mount;
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sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
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if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
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goto done;
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error = vfs2fs(SCARG(uap, buf), sbuf);
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done:
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vrele(nd.ni_vp);
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free(sbuf, M_TEMP);
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return error;
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}
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/*
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* Get filesystem statistics.
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*/
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/* ARGSUSED */
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int
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compat_20_sys_fstatfs(struct lwp *l, const struct compat_20_sys_fstatfs_args *uap, register_t *retval)
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{
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/* {
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syscallarg(int) fd;
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syscallarg(struct statfs12 *) buf;
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} */
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struct file *fp;
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struct mount *mp;
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struct statvfs *sbuf;
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int error;
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/* getvnode() will use the descriptor for us */
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if ((error = getvnode(SCARG(uap, fd), &fp)) != 0)
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return (error);
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mp = ((struct vnode *)fp->f_data)->v_mount;
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sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
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if ((error = dostatvfs(mp, sbuf, l, 0, 1)) != 0)
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goto out;
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error = vfs2fs(SCARG(uap, buf), sbuf);
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out:
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fd_putfile(SCARG(uap, fd));
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free(sbuf, M_TEMP);
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return error;
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}
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/*
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* Get statistics on all filesystems.
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*/
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int
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compat_20_sys_getfsstat(struct lwp *l, const struct compat_20_sys_getfsstat_args *uap, register_t *retval)
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{
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/* {
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syscallarg(struct statfs12 *) buf;
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syscallarg(long) bufsize;
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syscallarg(int) flags;
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} */
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int root = 0;
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struct mount *mp, *nmp;
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struct statvfs *sbuf;
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struct statfs12 *sfsp;
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size_t count, maxcount;
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int error = 0;
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sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
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maxcount = (size_t)SCARG(uap, bufsize) / sizeof(struct statfs12);
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sfsp = SCARG(uap, buf);
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mutex_enter(&mountlist_lock);
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count = 0;
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for (mp = CIRCLEQ_FIRST(&mountlist); mp != (void *)&mountlist;
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mp = nmp) {
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if (vfs_trybusy(mp, RW_READER, &mountlist_lock)) {
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nmp = CIRCLEQ_NEXT(mp, mnt_list);
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continue;
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}
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if (sfsp && count < maxcount) {
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error = dostatvfs(mp, sbuf, l, SCARG(uap, flags), 0);
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if (error) {
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mutex_enter(&mountlist_lock);
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nmp = CIRCLEQ_NEXT(mp, mnt_list);
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vfs_unbusy(mp, false);
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continue;
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}
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error = vfs2fs(sfsp, sbuf);
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if (error) {
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vfs_unbusy(mp, false);
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goto out;
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}
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sfsp++;
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root |= strcmp(sbuf->f_mntonname, "/") == 0;
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}
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count++;
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mutex_enter(&mountlist_lock);
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nmp = CIRCLEQ_NEXT(mp, mnt_list);
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vfs_unbusy(mp, false);
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}
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mutex_exit(&mountlist_lock);
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if (root == 0 && l->l_proc->p_cwdi->cwdi_rdir) {
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/*
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* fake a root entry
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*/
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if ((error = dostatvfs(l->l_proc->p_cwdi->cwdi_rdir->v_mount,
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sbuf, l, SCARG(uap, flags), 1)) != 0)
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goto out;
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if (sfsp)
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error = vfs2fs(sfsp, sbuf);
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count++;
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}
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if (sfsp && count > maxcount)
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*retval = maxcount;
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else
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*retval = count;
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out:
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free(sbuf, M_TEMP);
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return error;
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}
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int
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compat_20_sys_fhstatfs(struct lwp *l, const struct compat_20_sys_fhstatfs_args *uap, register_t *retval)
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{
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/* {
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syscallarg(const struct compat_30_fhandle *) fhp;
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syscallarg(struct statfs12 *) buf;
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} */
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struct statvfs *sbuf;
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struct compat_30_fhandle fh;
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struct mount *mp;
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struct vnode *vp;
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int error;
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/*
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* Must be super user
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*/
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if ((error = kauth_authorize_system(l->l_cred,
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KAUTH_SYSTEM_FILEHANDLE, 0, NULL, NULL, NULL)))
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return (error);
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if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fh))) != 0)
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return (error);
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if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
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return (ESTALE);
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if ((error = VFS_FHTOVP(mp, (struct fid*)&fh.fh_fid, &vp)))
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return (error);
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mp = vp->v_mount;
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VOP_UNLOCK(vp, 0);
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sbuf = malloc(sizeof(*sbuf), M_TEMP, M_WAITOK);
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if ((error = VFS_STATVFS(mp, sbuf)) != 0)
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goto out;
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error = vfs2fs(SCARG(uap, buf), sbuf);
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out:
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vrele(vp);
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free(sbuf, M_TEMP);
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return error;
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}
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