/*      $NetBSD: netbsd32_compat_20.c,v 1.42 2021/09/07 11:43:05 riastradh Exp $        */

/*
* Copyright (c) 1998, 2001 Matthew R. Green
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: netbsd32_compat_20.c,v 1.42 2021/09/07 11:43:05 riastradh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/ktrace.h>
#include <sys/vnode.h>
#include <sys/socket.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <sys/namei.h>
#include <sys/syscallargs.h>
#include <sys/syscallvar.h>
#include <sys/proc.h>
#include <sys/dirent.h>

#include <compat/netbsd32/netbsd32.h>
#include <compat/netbsd32/netbsd32_syscall.h>
#include <compat/netbsd32/netbsd32_syscallargs.h>
#include <compat/netbsd32/netbsd32_conv.h>

static inline void compat_20_netbsd32_from_statvfs(struct statvfs *,
   struct netbsd32_statfs *);

static inline void
compat_20_netbsd32_from_statvfs(struct statvfs *sbp, struct netbsd32_statfs *sb32p)
{

       memset(sb32p, 0, sizeof(*sb32p));
       sb32p->f_type = 0; /* XXX Put an actual value? */
       sb32p->f_flags = sbp->f_flag;
       sb32p->f_bsize = (netbsd32_long)sbp->f_bsize;
       sb32p->f_iosize = (netbsd32_long)sbp->f_iosize;
       sb32p->f_blocks = (netbsd32_long)sbp->f_blocks;
       sb32p->f_bfree = (netbsd32_long)sbp->f_bfree;
       sb32p->f_bavail = (netbsd32_long)sbp->f_bavail;
       sb32p->f_files = (netbsd32_long)sbp->f_files;
       sb32p->f_ffree = (netbsd32_long)sbp->f_ffree;
       sb32p->f_fsid = sbp->f_fsidx;
       sb32p->f_owner = sbp->f_owner;
       sb32p->f_spare[0] = 0;
       sb32p->f_spare[1] = 0;
       sb32p->f_spare[2] = 0;
       sb32p->f_spare[3] = 0;
       (void)memcpy(sb32p->f_fstypename, sbp->f_fstypename,
           sizeof(sb32p->f_fstypename));
       (void)memcpy(sb32p->f_mntonname, sbp->f_mntonname,
           sizeof(sb32p->f_mntonname));
       (void)memcpy(sb32p->f_mntfromname, sbp->f_mntfromname,
           sizeof(sb32p->f_mntfromname));
}

int
compat_20_netbsd32_getfsstat(struct lwp *l, const struct compat_20_netbsd32_getfsstat_args *uap, register_t *retval)
{
       /* {
               syscallarg(netbsd32_statfsp_t) buf;
               syscallarg(netbsd32_long) bufsize;
               syscallarg(int) flags;
       } */
       int root = 0;
       struct proc *p = l->l_proc;
       mount_iterator_t *iter;
       struct mount *mp;
       struct statvfs *sb;
       struct netbsd32_statfs sb32;
       void *sfsp;
       size_t count, maxcount;
       int error = 0;

       sb = STATVFSBUF_GET();
       maxcount = SCARG(uap, bufsize) / sizeof(struct netbsd32_statfs);
       sfsp = SCARG_P32(uap, buf);
       mountlist_iterator_init(&iter);
       count = 0;
       while ((mp = mountlist_iterator_next(iter)) != NULL) {
               if (sfsp && count < maxcount) {
                       error = dostatvfs(mp, sb, l, SCARG(uap, flags), 0);
                       if (error) {
                               error = 0;
                               continue;
                       }
                       compat_20_netbsd32_from_statvfs(sb, &sb32);
                       error = copyout(&sb32, sfsp, sizeof(sb32));
                       if (error)
                               goto out;
                       sfsp = (char *)sfsp + sizeof(sb32);
                       root |= strcmp(sb->f_mntonname, "/") == 0;
               }
               count++;
       }

       if (root == 0 && p->p_cwdi->cwdi_rdir) {
               /*
                * fake a root entry
                */
               error = dostatvfs(p->p_cwdi->cwdi_rdir->v_mount,
                   sb, l, SCARG(uap, flags), 1);
               if (error != 0)
                       goto out;
               if (sfsp) {
                       compat_20_netbsd32_from_statvfs(sb, &sb32);
                       error = copyout(&sb32, sfsp, sizeof(sb32));
                       if (error != 0)
                               goto out;
               }
               count++;
       }

       if (sfsp && count > maxcount)
               *retval = maxcount;
       else
               *retval = count;
out:
       mountlist_iterator_destroy(iter);
       STATVFSBUF_PUT(sb);
       return error;
}

int
compat_20_netbsd32_statfs(struct lwp *l, const struct compat_20_netbsd32_statfs_args *uap, register_t *retval)
{
       /* {
               syscallarg(const netbsd32_charp) path;
               syscallarg(netbsd32_statfsp_t) buf;
       } */
       struct mount *mp;
       struct statvfs *sb;
       struct netbsd32_statfs s32;
       int error;
       struct vnode *vp;

       error = namei_simple_user(SCARG_P32(uap, path),
                               NSM_FOLLOW_TRYEMULROOT, &vp);
       if (error != 0)
               return error;
       mp = vp->v_mount;
       vrele(vp);
       sb = STATVFSBUF_GET();
       if ((error = dostatvfs(mp, sb, l, 0, 0)) != 0)
               goto out;
       compat_20_netbsd32_from_statvfs(sb, &s32);
       error = copyout(&s32, SCARG_P32(uap, buf), sizeof(s32));
out:
       STATVFSBUF_PUT(sb);
       return error;
}

int
compat_20_netbsd32_fstatfs(struct lwp *l, const struct compat_20_netbsd32_fstatfs_args *uap, register_t *retval)
{
       /* {
               syscallarg(int) fd;
               syscallarg(netbsd32_statfsp_t) buf;
       } */
       file_t *fp;
       struct mount *mp;
       struct statvfs *sb;
       struct netbsd32_statfs s32;
       int error;

       /* fd_getvnode() will use the descriptor for us */
       if ((error = fd_getvnode(SCARG(uap, fd), &fp)) != 0)
               return error;
       mp = fp->f_vnode->v_mount;
       sb = STATVFSBUF_GET();
       if ((error = dostatvfs(mp, sb, l, 0, 0)) != 0)
               goto out;
       compat_20_netbsd32_from_statvfs(sb, &s32);
       error = copyout(&s32, SCARG_P32(uap, buf), sizeof(s32));
out:
       STATVFSBUF_PUT(sb);
       fd_putfile(SCARG(uap, fd));
       return error;
}

int
compat_20_netbsd32_fhstatfs(struct lwp *l, const struct compat_20_netbsd32_fhstatfs_args *uap, register_t *retval)
{
       /* {
               syscallarg(const netbsd32_fhandlep_t) fhp;
               syscallarg(struct statvfs *) buf;
       } */
       struct compat_30_sys_fhstatvfs1_args ua;

       NETBSD32TOP_UAP(fhp, const struct compat_30_fhandle);
       NETBSD32TOP_UAP(buf, struct statvfs);
#ifdef notyet
       NETBSD32TOP_UAP(flags, int);
#endif
       return compat_30_sys_fhstatvfs1(l, &ua, retval);
}

static struct syscall_package compat_netbsd32_20_syscalls[] = {
       { NETBSD32_SYS_compat_20_netbsd32_statfs, 0,
           (sy_call_t *)compat_20_netbsd32_statfs },
       { NETBSD32_SYS_compat_20_netbsd32_fstatfs, 0,
           (sy_call_t *)compat_20_netbsd32_fstatfs },
       { NETBSD32_SYS_compat_20_netbsd32_fhstatfs, 0,
           (sy_call_t *)compat_20_netbsd32_fhstatfs },
       { NETBSD32_SYS_compat_20_netbsd32_getfsstat, 0,
           (sy_call_t *)compat_20_netbsd32_getfsstat },
       { 0, 0, NULL }
};

MODULE(MODULE_CLASS_EXEC, compat_netbsd32_20, "compat_netbsd32_30,compat_20");

static int
compat_netbsd32_20_modcmd(modcmd_t cmd, void *arg)
{

       switch (cmd) {
       case MODULE_CMD_INIT:
               return syscall_establish(&emul_netbsd32,
                   compat_netbsd32_20_syscalls);

       case MODULE_CMD_FINI:
               return syscall_disestablish(&emul_netbsd32,
                   compat_netbsd32_20_syscalls);

       default:
               return ENOTTY;
       }
}

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