common/syscall/statfs.c

	statfs.c revision dd29fa4a741733485a5b868b0897983a7e6d8055
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota/*
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * CDDL HEADER START
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota *
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * The contents of this file are subject to the terms of the
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * Common Development and Distribution License (the "License").
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * You may not use this file except in compliance with the License.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota *
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * or http://www.opensolaris.org/os/licensing.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * See the License for the specific language governing permissions
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * and limitations under the License.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota *
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * When distributing Covered Code, include this CDDL HEADER in each
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * If applicable, add the following below this CDDL HEADER, with the
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * fields enclosed by brackets "[]" replaced with your own identifying
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * information: Portions Copyright [yyyy] [name of copyright owner]
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota *
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * CDDL HEADER END
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota */
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota/*
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * Use is subject to license terms.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota */
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota/*  Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota/*    All Rights Reserved   */
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota/*
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * Portions of this source code were derived from Berkeley 4.3 BSD
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * under license from the Regents of the University of California.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota */
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#pragma ident   "%Z%%M% %I% %E% SMI"
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/inttypes.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/types.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/t_lock.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/param.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/errno.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/fstyp.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/systm.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/vfs.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/statfs.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/vnode.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/file.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/cmn_err.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/debug.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <sys/pathname.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <vm/page.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#include <fs/fs_subr.h>
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#if defined(_SYSCALL32_IMPL) || defined(_ILP32)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota/*
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * statfs(2) and fstatfs(2) have been replaced by statvfs(2) and
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * fstatvfs(2) and will be removed from the system in a near-future
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * release.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota *
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * Supported here purely for 32-bit compatibility.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota */
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Otastatic int cstatfs(struct vfs *, struct statfs32 *, int);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Otaint
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Otastatfs32(char *fname, struct statfs32 *sbp, int32_t len, int32_t fstyp)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota{
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    vnode_t *vp;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    int error;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    int estale_retry = 0;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Otalookup:
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) {
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota            goto lookup;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        return (set_errno(error));
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    }
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if (fstyp != 0)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        error = EINVAL;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    else
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        error = cstatfs(vp->v_vfsp, sbp, len);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    VN_RELE(vp);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if (error) {
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota            goto lookup;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        return (set_errno(error));
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    }
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    return (0);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota}
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Otaint
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Otafstatfs32(int32_t fdes, struct statfs32 *sbp, int32_t len, int32_t fstyp)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota{
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    struct file *fp;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    int error;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if (fstyp != 0)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        return (set_errno(EINVAL));
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if ((fp = getf(fdes)) == NULL)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        return (set_errno(EBADF));
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    error = cstatfs(fp->f_vnode->v_vfsp, sbp, len);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    releasef(fdes);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if (error)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        return (set_errno(error));
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    return (0);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota}
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota/*
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota * Common routine for fstatfs and statfs.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota */
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Otastatic int
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Otacstatfs(struct vfs *vfsp, struct statfs32 *sbp, int len)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota{
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    struct statfs32 sfs;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    struct statvfs64 svfs;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    int error, i;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    char *cp, *cp2;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    struct vfssw *vswp;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if (len < 0 || len > sizeof (struct statfs))
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        return (EINVAL);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if (error = VFS_STATVFS(vfsp, &svfs))
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        return (error);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if (svfs.f_blocks > UINT32_MAX || svfs.f_bfree > UINT32_MAX ||
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        svfs.f_files > UINT32_MAX || svfs.f_ffree > UINT32_MAX)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        return (EOVERFLOW);
6e18d381c642549b8bb1774a803d3510aec6baafagiri    /*
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota     * Map statvfs fields into the old statfs structure.
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota     */
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    bzero(&sfs, sizeof (sfs));
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    sfs.f_bsize = svfs.f_bsize;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    sfs.f_frsize = (svfs.f_frsize == svfs.f_bsize) ? 0 : svfs.f_frsize;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    sfs.f_blocks = svfs.f_blocks * (svfs.f_frsize / 512);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    sfs.f_bfree = svfs.f_bfree * (svfs.f_frsize / 512);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    sfs.f_files = svfs.f_files;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    sfs.f_ffree = svfs.f_ffree;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    cp = svfs.f_fstr;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    cp2 = sfs.f_fname;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    i = 0;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    while (i++ < sizeof (sfs.f_fname))
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        if (*cp != '\0')
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota            *cp2++ = *cp++;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        else
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota            *cp2++ = '\0';
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    while (*cp != '\0' &&
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        i++ < (sizeof (svfs.f_fstr) - sizeof (sfs.f_fpack)))
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        cp++;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    (void) strncpy(sfs.f_fpack, cp + 1, sizeof (sfs.f_fpack));
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if ((vswp = vfs_getvfssw(svfs.f_basetype)) == NULL)
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        sfs.f_fstyp = 0;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    else {
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        sfs.f_fstyp = vswp - vfssw;
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        vfs_unrefvfssw(vswp);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    }
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    if (copyout(&sfs, sbp, len))
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota        return (EFAULT);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota    return (0);
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota}
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota#endif  /* _SYSCALL32_IMPL || _ILP32 */
c0dd49bdd68c0d758a67d56f07826f3b45cfc664Eiji Ota