b8fbaf8c4b
avoid having to allocate space in the 'stackgap' - which is very LWP unfriendly. The additional code for non-emulation namei() is trivial, the reduction for the emulations is massive. The vnode for a processes emulation root is saved in the cwdi structure during process exec. If the emulation root the TRYEMULROOT flag are set, namei() will do an initial search for absolute pathnames in the emulation root, if that fails it will retry from the normal root. ".." at the emulation root will always go to the real root, even in the middle of paths and when expanding symlinks. Absolute symlinks found using absolute paths in the emulation root will be relative to the emulation root (so /usr/lib/xxx.so -> /lib/xxx.so links inside the emulation root don't need changing). If the root of the emulation would be returned (for an emulation lookup), then the real root is returned instead (matching the behaviour of emul_lookup, but being a cheap comparison here) so that programs that scan "../.." looking for the root dircetory don't loop forever. The target for symbolic links is no longer mangled (it used to get the CHECK_ALT_xxx() treatment, so could get /emul/xxx prepended). CHECK_ALT_xxx() are no more. Most of the change is deleting them, and adding TRYEMULROOT to the flags to NDINIT(). A lot of the emulation system call stubs could now be deleted.
231 lines
6.8 KiB
C
231 lines
6.8 KiB
C
/* $NetBSD: netbsd32_compat_20.c,v 1.12 2007/04/22 08:29:58 dsl Exp $ */
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/*
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* Copyright (c) 1998, 2001 Matthew R. Green
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* All rights reserved.
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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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: netbsd32_compat_20.c,v 1.12 2007/04/22 08:29:58 dsl Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/ktrace.h>
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#include <sys/vnode.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/namei.h>
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#include <sys/syscallargs.h>
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#include <sys/proc.h>
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#include <sys/dirent.h>
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#include <compat/netbsd32/netbsd32.h>
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#include <compat/netbsd32/netbsd32_syscallargs.h>
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#include <compat/netbsd32/netbsd32_conv.h>
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static inline void compat_20_netbsd32_from_statvfs(struct statvfs *,
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struct netbsd32_statfs *);
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static inline void
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compat_20_netbsd32_from_statvfs(sbp, sb32p)
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struct statvfs *sbp;
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struct netbsd32_statfs *sb32p;
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{
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sb32p->f_flags = sbp->f_flag;
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sb32p->f_bsize = (netbsd32_long)sbp->f_bsize;
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sb32p->f_iosize = (netbsd32_long)sbp->f_iosize;
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sb32p->f_blocks = (netbsd32_long)sbp->f_blocks;
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sb32p->f_bfree = (netbsd32_long)sbp->f_bfree;
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sb32p->f_bavail = (netbsd32_long)sbp->f_bavail;
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sb32p->f_files = (netbsd32_long)sbp->f_files;
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sb32p->f_ffree = (netbsd32_long)sbp->f_ffree;
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sb32p->f_fsid = sbp->f_fsidx;
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sb32p->f_owner = sbp->f_owner;
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sb32p->f_spare[0] = 0;
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sb32p->f_spare[1] = 0;
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sb32p->f_spare[2] = 0;
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sb32p->f_spare[3] = 0;
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#if 1
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/* May as well do the whole batch in one go */
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memcpy(sb32p->f_fstypename, sbp->f_fstypename, MFSNAMELEN+MNAMELEN+MNAMELEN);
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#else
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/* If we want to be careful */
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memcpy(sb32p->f_fstypename, sbp->f_fstypename, MFSNAMELEN);
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memcpy(sb32p->f_mntonname, sbp->f_mntonname, MNAMELEN);
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memcpy(sb32p->f_mntfromname, sbp->f_mntfromname, MNAMELEN);
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#endif
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}
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int
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compat_20_netbsd32_getfsstat(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct compat_20_netbsd32_getfsstat_args /* {
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syscallarg(netbsd32_statfsp_t) buf;
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syscallarg(netbsd32_long) bufsize;
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syscallarg(int) flags;
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} */ *uap = v;
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struct mount *mp, *nmp;
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struct statvfs *sp;
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struct netbsd32_statfs sb32;
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void *sfsp;
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long count, maxcount, error;
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maxcount = SCARG(uap, bufsize) / sizeof(struct netbsd32_statfs);
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sfsp = SCARG_P32(uap, buf);
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simple_lock(&mountlist_slock);
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count = 0;
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for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
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if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock)) {
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nmp = mp->mnt_list.cqe_next;
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continue;
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}
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if (sfsp && count < maxcount) {
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sp = &mp->mnt_stat;
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/*
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* If MNT_NOWAIT or MNT_LAZY is specified, do not
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* refresh the fsstat cache. MNT_WAIT or MNT_LAZY
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* overrides MNT_NOWAIT.
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*/
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if (SCARG(uap, flags) != MNT_NOWAIT &&
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SCARG(uap, flags) != MNT_LAZY &&
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(SCARG(uap, flags) == MNT_WAIT ||
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SCARG(uap, flags) == 0) &&
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(error = VFS_STATVFS(mp, sp, l)) != 0) {
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simple_lock(&mountlist_slock);
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nmp = mp->mnt_list.cqe_next;
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vfs_unbusy(mp);
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continue;
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}
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sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK;
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compat_20_netbsd32_from_statvfs(sp, &sb32);
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error = copyout(&sb32, sfsp, sizeof(sb32));
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if (error) {
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vfs_unbusy(mp);
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return (error);
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}
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sfsp = (char *)sfsp + sizeof(sb32);
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}
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count++;
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simple_lock(&mountlist_slock);
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nmp = mp->mnt_list.cqe_next;
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vfs_unbusy(mp);
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}
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simple_unlock(&mountlist_slock);
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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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return (0);
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}
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int
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compat_20_netbsd32_statfs(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct compat_20_netbsd32_statfs_args /* {
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syscallarg(const netbsd32_charp) path;
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syscallarg(netbsd32_statfsp_t) buf;
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} */ *uap = v;
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struct mount *mp;
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struct statvfs *sp;
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struct netbsd32_statfs s32;
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int error;
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struct nameidata nd;
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NDINIT(&nd, LOOKUP, FOLLOW | TRYEMULROOT, UIO_USERSPACE, SCARG_P32(uap, path), l);
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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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sp = &mp->mnt_stat;
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vrele(nd.ni_vp);
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if ((error = VFS_STATVFS(mp, sp, l)) != 0)
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return (error);
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sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK;
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compat_20_netbsd32_from_statvfs(sp, &s32);
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return copyout(&s32, SCARG_P32(uap, buf), sizeof(s32));
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}
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int
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compat_20_netbsd32_fstatfs(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct compat_20_netbsd32_fstatfs_args /* {
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syscallarg(int) fd;
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syscallarg(netbsd32_statfsp_t) buf;
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} */ *uap = v;
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struct file *fp;
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struct mount *mp;
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struct statvfs *sp;
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struct netbsd32_statfs s32;
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int error;
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struct proc *p = l->l_proc;
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/* getvnode() will use the descriptor for us */
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if ((error = getvnode(p->p_fd, 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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sp = &mp->mnt_stat;
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if ((error = VFS_STATVFS(mp, sp, l)) != 0)
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goto out;
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sp->f_flag = mp->mnt_flag & MNT_VISFLAGMASK;
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compat_20_netbsd32_from_statvfs(sp, &s32);
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error = copyout(&s32, SCARG_P32(uap, buf), sizeof(s32));
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out:
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FILE_UNUSE(fp, l);
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return (error);
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}
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int
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compat_20_netbsd32_fhstatfs(l, v, retval)
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struct lwp *l;
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void *v;
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register_t *retval;
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{
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struct compat_20_netbsd32_fhstatfs_args /* {
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syscallarg(const netbsd32_fhandlep_t) fhp;
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syscallarg(struct statvfs *) buf;
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} */ *uap = v;
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struct compat_30_sys_fhstatvfs1_args ua;
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NETBSD32TOP_UAP(fhp, const struct compat_30_fhandle);
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NETBSD32TOP_UAP(buf, struct statvfs);
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#ifdef notyet
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NETBSD32TOP_UAP(flags, int);
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#endif
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return (compat_30_sys_fhstatvfs1(l, &ua, retval));
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}
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