compat/netbsd32/netbsd32_compat_20.c

/*        $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;
          }
}