/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
/*        All Rights Reserved   */

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

#include <sys/inttypes.h>
#include <sys/types.h>
#include <sys/t_lock.h>
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/fstyp.h>
#include <sys/systm.h>
#include <sys/vfs.h>
#include <sys/statfs.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/cmn_err.h>
#include <sys/debug.h>
#include <sys/pathname.h>

#include <vm/page.h>
#include <fs/fs_subr.h>

#if defined(_SYSCALL32_IMPL) || defined(_ILP32)

/*
 * statfs(2) and fstatfs(2) have been replaced by statvfs(2) and
 * fstatvfs(2) and will be removed from the system in a near-future
 * release.
 *
 * Supported here purely for 32-bit compatibility.
 */

static int cstatfs(struct vfs *, struct statfs32 *, int);

int
statfs32(char *fname, struct statfs32 *sbp, int32_t len, int32_t fstyp)
{
        vnode_t *vp;
        int error;
        int estale_retry = 0;

lookup:
        if (error = lookupname(fname, UIO_USERSPACE, FOLLOW, NULLVPP, &vp)) {
                if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
                        goto lookup;
                return (set_errno(error));
        }
        if (fstyp != 0)
                error = EINVAL;
        else
                error = cstatfs(vp->v_vfsp, sbp, len);
        VN_RELE(vp);
        if (error) {
                if ((error == ESTALE) && fs_need_estale_retry(estale_retry++))
                        goto lookup;
                return (set_errno(error));
        }
        return (0);
}

int
fstatfs32(int32_t fdes, struct statfs32 *sbp, int32_t len, int32_t fstyp)
{
        struct file *fp;
        int error;

        if (fstyp != 0)
                return (set_errno(EINVAL));
        if ((fp = getf(fdes)) == NULL)
                return (set_errno(EBADF));
        error = cstatfs(fp->f_vnode->v_vfsp, sbp, len);
        releasef(fdes);
        if (error)
                return (set_errno(error));
        return (0);
}

/*
 * Common routine for fstatfs and statfs.
 */
static int
cstatfs(struct vfs *vfsp, struct statfs32 *sbp, int len)
{
        struct statfs32 sfs;
        struct statvfs64 svfs;
        int error, i;
        char *cp, *cp2;
        struct vfssw *vswp;

        if (len < 0 || len > sizeof (struct statfs))
                return (EINVAL);
        if (error = VFS_STATVFS(vfsp, &svfs))
                return (error);

        if (svfs.f_blocks > UINT32_MAX || svfs.f_bfree > UINT32_MAX ||
            svfs.f_files > UINT32_MAX || svfs.f_ffree > UINT32_MAX)
            return (EOVERFLOW);
        /*
         * Map statvfs fields into the old statfs structure.
         */
        bzero(&sfs, sizeof (sfs));
        sfs.f_bsize = svfs.f_bsize;
        sfs.f_frsize = (svfs.f_frsize == svfs.f_bsize) ? 0 : svfs.f_frsize;
        sfs.f_blocks = svfs.f_blocks * (svfs.f_frsize / 512);
        sfs.f_bfree = svfs.f_bfree * (svfs.f_frsize / 512);
        sfs.f_files = svfs.f_files;
        sfs.f_ffree = svfs.f_ffree;

        cp = svfs.f_fstr;
        cp2 = sfs.f_fname;
        i = 0;
        while (i++ < sizeof (sfs.f_fname))
                if (*cp != '\0')
                        *cp2++ = *cp++;
                else
                        *cp2++ = '\0';
        while (*cp != '\0' &&
            i++ < (sizeof (svfs.f_fstr) - sizeof (sfs.f_fpack)))
                cp++;
        (void) strncpy(sfs.f_fpack, cp + 1, sizeof (sfs.f_fpack));
        if ((vswp = vfs_getvfssw(svfs.f_basetype)) == NULL)
                sfs.f_fstyp = 0;
        else {
                sfs.f_fstyp = vswp - vfssw;
                vfs_unrefvfssw(vswp);
        }

        if (copyout(&sfs, sbp, len))
                return (EFAULT);

        return (0);
}

#endif  /* _SYSCALL32_IMPL || _ILP32 */