Logo Search packages:      
Sourcecode: ufsutils version File versions  Download package

ufs_vnops.c

/*-
 * Copyright (c) 1982, 1986, 1989, 1993, 1995
 *    The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 *
 *    @(#)ufs_vnops.c   8.27 (Berkeley) 5/27/95
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/ufs/ufs/ufs_vnops.c,v 1.291 2007/06/12 00:12:01 rwatson Exp $");

#include "opt_mac.h"
#include "opt_quota.h"
#include "opt_suiddir.h"
#include "opt_ufs.h"
#include "opt_ffs.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/priv.h>
#include <sys/refcount.h>
#include <sys/unistd.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <sys/lockf.h>
#include <sys/conf.h>
#include <sys/acl.h>
#include <sys/jail.h>

#include <machine/mutex.h>

#include <security/mac/mac_framework.h>

#include <sys/file.h>         /* XXX */

#include <vm/vm.h>
#include <vm/vm_extern.h>

#include <fs/fifofs/fifo.h>

#include <ufs/ufs/acl.h>
#include <ufs/ufs/extattr.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/dir.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#ifdef UFS_DIRHASH
#include <ufs/ufs/dirhash.h>
#endif
#ifdef UFS_GJOURNAL
#include <ufs/ufs/gjournal.h>
#endif

#include <ufs/ffs/ffs_extern.h>

static vop_access_t     ufs_access;
static vop_advlock_t    ufs_advlock;
static int ufs_chmod(struct vnode *, int, struct ucred *, struct thread *);
static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct thread *);
static vop_close_t      ufs_close;
static vop_create_t     ufs_create;
static vop_getattr_t    ufs_getattr;
static vop_link_t ufs_link;
static int ufs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
static vop_mkdir_t      ufs_mkdir;
static vop_mknod_t      ufs_mknod;
static vop_open_t ufs_open;
static vop_pathconf_t   ufs_pathconf;
static vop_print_t      ufs_print;
static vop_readlink_t   ufs_readlink;
static vop_remove_t     ufs_remove;
static vop_rename_t     ufs_rename;
static vop_rmdir_t      ufs_rmdir;
static vop_setattr_t    ufs_setattr;
static vop_strategy_t   ufs_strategy;
static vop_symlink_t    ufs_symlink;
static vop_whiteout_t   ufs_whiteout;
static vop_close_t      ufsfifo_close;
static vop_kqfilter_t   ufsfifo_kqfilter;

/*
 * A virgin directory (no blushing please).
 */
static struct dirtemplate mastertemplate = {
      0, 12, DT_DIR, 1, ".",
      0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
};
static struct odirtemplate omastertemplate = {
      0, 12, 1, ".",
      0, DIRBLKSIZ - 12, 2, ".."
};

static void
ufs_itimes_locked(struct vnode *vp)
{
      struct inode *ip;
      struct timespec ts;

      ASSERT_VI_LOCKED(vp, __func__);

      ip = VTOI(vp);
      if ((vp->v_mount->mnt_flag & MNT_RDONLY) != 0)
            goto out;
      if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
            return;

      if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp))
            ip->i_flag |= IN_LAZYMOD;
      else if (((vp->v_mount->mnt_kern_flag &
                (MNTK_SUSPENDED | MNTK_SUSPEND)) == 0) ||
                (ip->i_flag & (IN_CHANGE | IN_UPDATE)))
            ip->i_flag |= IN_MODIFIED;
      else if (ip->i_flag & IN_ACCESS)
            ip->i_flag |= IN_LAZYACCESS;
      vfs_timestamp(&ts);
      if (ip->i_flag & IN_ACCESS) {
            DIP_SET(ip, i_atime, ts.tv_sec);
            DIP_SET(ip, i_atimensec, ts.tv_nsec);
      }
      if (ip->i_flag & IN_UPDATE) {
            DIP_SET(ip, i_mtime, ts.tv_sec);
            DIP_SET(ip, i_mtimensec, ts.tv_nsec);
            ip->i_modrev++;
      }
      if (ip->i_flag & IN_CHANGE) {
            DIP_SET(ip, i_ctime, ts.tv_sec);
            DIP_SET(ip, i_ctimensec, ts.tv_nsec);
      }

 out:
      ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
}

void
ufs_itimes(struct vnode *vp)
{

      VI_LOCK(vp);
      ufs_itimes_locked(vp);
      VI_UNLOCK(vp);
}

/*
 * Create a regular file
 */
static int
ufs_create(ap)
      struct vop_create_args /* {
            struct vnode *a_dvp;
            struct vnode **a_vpp;
            struct componentname *a_cnp;
            struct vattr *a_vap;
      } */ *ap;
{
      int error;

      error =
          ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
          ap->a_dvp, ap->a_vpp, ap->a_cnp);
      if (error)
            return (error);
      return (0);
}

/*
 * Mknod vnode call
 */
/* ARGSUSED */
static int
ufs_mknod(ap)
      struct vop_mknod_args /* {
            struct vnode *a_dvp;
            struct vnode **a_vpp;
            struct componentname *a_cnp;
            struct vattr *a_vap;
      } */ *ap;
{
      struct vattr *vap = ap->a_vap;
      struct vnode **vpp = ap->a_vpp;
      struct inode *ip;
      ino_t ino;
      int error;

      error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
          ap->a_dvp, vpp, ap->a_cnp);
      if (error)
            return (error);
      ip = VTOI(*vpp);
      ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
      if (vap->va_rdev != VNOVAL) {
            /*
             * Want to be able to use this to make badblock
             * inodes, so don't truncate the dev number.
             */
            DIP_SET(ip, i_rdev, vap->va_rdev);
      }
      /*
       * Remove inode, then reload it through VFS_VGET so it is
       * checked to see if it is an alias of an existing entry in
       * the inode cache.  XXX I don't believe this is necessary now.
       */
      (*vpp)->v_type = VNON;
      ino = ip->i_number;     /* Save this before vgone() invalidates ip. */
      vgone(*vpp);
      vput(*vpp);
      error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
      if (error) {
            *vpp = NULL;
            return (error);
      }
      return (0);
}

/*
 * Open called.
 */
/* ARGSUSED */
static int
ufs_open(struct vop_open_args *ap)
{
      struct vnode *vp = ap->a_vp;
      struct inode *ip;

      if (vp->v_type == VCHR || vp->v_type == VBLK)
            return (EOPNOTSUPP);

      ip = VTOI(vp);
      /*
       * Files marked append-only must be opened for appending.
       */
      if ((ip->i_flags & APPEND) &&
          (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
            return (EPERM);
      vnode_create_vobject(vp, DIP(ip, i_size), ap->a_td);
      return (0);
}

/*
 * Close called.
 *
 * Update the times on the inode.
 */
/* ARGSUSED */
static int
ufs_close(ap)
      struct vop_close_args /* {
            struct vnode *a_vp;
            int  a_fflag;
            struct ucred *a_cred;
            struct thread *a_td;
      } */ *ap;
{
      struct vnode *vp = ap->a_vp;
      int usecount;

      VI_LOCK(vp);
      usecount = vp->v_usecount;
      if (usecount > 1)
            ufs_itimes_locked(vp);
      VI_UNLOCK(vp);
      return (0);
}

static int
ufs_access(ap)
      struct vop_access_args /* {
            struct vnode *a_vp;
            int  a_mode;
            struct ucred *a_cred;
            struct thread *a_td;
      } */ *ap;
{
      struct vnode *vp = ap->a_vp;
      struct inode *ip = VTOI(vp);
      mode_t mode = ap->a_mode;
      int error;
#ifdef UFS_ACL
      struct acl *acl;
#endif

      /*
       * Disallow write attempts on read-only filesystems;
       * unless the file is a socket, fifo, or a block or
       * character device resident on the filesystem.
       */
      if (mode & VWRITE) {
            switch (vp->v_type) {
            case VDIR:
            case VLNK:
            case VREG:
                  if (vp->v_mount->mnt_flag & MNT_RDONLY)
                        return (EROFS);
                  break;
            default:
                  break;
            }
      }

      /* If immutable bit set, nobody gets to write it. */
      if ((mode & VWRITE) && (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
            return (EPERM);

#ifdef UFS_ACL
      if ((vp->v_mount->mnt_flag & MNT_ACLS) != 0) {
            acl = uma_zalloc(acl_zone, M_WAITOK);
            error = VOP_GETACL(vp, ACL_TYPE_ACCESS, acl, ap->a_cred,
                ap->a_td);
            switch (error) {
            case EOPNOTSUPP:
                  error = vaccess(vp->v_type, ip->i_mode, ip->i_uid,
                      ip->i_gid, ap->a_mode, ap->a_cred, NULL);
                  break;
            case 0:
                  error = vaccess_acl_posix1e(vp->v_type, ip->i_uid,
                      ip->i_gid, acl, ap->a_mode, ap->a_cred, NULL);
                  break;
            default:
                  printf(
"ufs_access(): Error retrieving ACL on object (%d).\n",
                      error);
                  /*
                   * XXX: Fall back until debugged.  Should
                   * eventually possibly log an error, and return
                   * EPERM for safety.
                   */
                  error = vaccess(vp->v_type, ip->i_mode, ip->i_uid,
                      ip->i_gid, ap->a_mode, ap->a_cred, NULL);
            }
            uma_zfree(acl_zone, acl);
      } else
#endif /* !UFS_ACL */
            error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
                ap->a_mode, ap->a_cred, NULL);
      return (error);
}

/* ARGSUSED */
static int
ufs_getattr(ap)
      struct vop_getattr_args /* {
            struct vnode *a_vp;
            struct vattr *a_vap;
            struct ucred *a_cred;
            struct thread *a_td;
      } */ *ap;
{
      struct vnode *vp = ap->a_vp;
      struct inode *ip = VTOI(vp);
      struct vattr *vap = ap->a_vap;

      VI_LOCK(vp);
      ufs_itimes_locked(vp);
      if (ip->i_ump->um_fstype == UFS1) {
            vap->va_atime.tv_sec = ip->i_din1->di_atime;
            vap->va_atime.tv_nsec = ip->i_din1->di_atimensec;
      } else {
            vap->va_atime.tv_sec = ip->i_din2->di_atime;
            vap->va_atime.tv_nsec = ip->i_din2->di_atimensec;
      }
      VI_UNLOCK(vp);
      /*
       * Copy from inode table
       */
      vap->va_fsid = dev2udev(ip->i_dev);
      vap->va_fileid = ip->i_number;
      vap->va_mode = ip->i_mode & ~IFMT;
      vap->va_nlink = ip->i_effnlink;
      vap->va_uid = ip->i_uid;
      vap->va_gid = ip->i_gid;
      if (ip->i_ump->um_fstype == UFS1) {
            vap->va_rdev = ip->i_din1->di_rdev;
            vap->va_size = ip->i_din1->di_size;
            vap->va_mtime.tv_sec = ip->i_din1->di_mtime;
            vap->va_mtime.tv_nsec = ip->i_din1->di_mtimensec;
            vap->va_ctime.tv_sec = ip->i_din1->di_ctime;
            vap->va_ctime.tv_nsec = ip->i_din1->di_ctimensec;
            vap->va_birthtime.tv_sec = 0;
            vap->va_birthtime.tv_nsec = 0;
            vap->va_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks);
      } else {
            vap->va_rdev = ip->i_din2->di_rdev;
            vap->va_size = ip->i_din2->di_size;
            vap->va_mtime.tv_sec = ip->i_din2->di_mtime;
            vap->va_mtime.tv_nsec = ip->i_din2->di_mtimensec;
            vap->va_ctime.tv_sec = ip->i_din2->di_ctime;
            vap->va_ctime.tv_nsec = ip->i_din2->di_ctimensec;
            vap->va_birthtime.tv_sec = ip->i_din2->di_birthtime;
            vap->va_birthtime.tv_nsec = ip->i_din2->di_birthnsec;
            vap->va_bytes = dbtob((u_quad_t)ip->i_din2->di_blocks);
      }
      vap->va_flags = ip->i_flags;
      vap->va_gen = ip->i_gen;
      vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
      vap->va_type = IFTOVT(ip->i_mode);
      vap->va_filerev = ip->i_modrev;
      return (0);
}

/*
 * Set attribute vnode op. called from several syscalls
 */
static int
ufs_setattr(ap)
      struct vop_setattr_args /* {
            struct vnode *a_vp;
            struct vattr *a_vap;
            struct ucred *a_cred;
            struct thread *a_td;
      } */ *ap;
{
      struct vattr *vap = ap->a_vap;
      struct vnode *vp = ap->a_vp;
      struct inode *ip = VTOI(vp);
      struct ucred *cred = ap->a_cred;
      struct thread *td = ap->a_td;
      int error;

      /*
       * Check for unsettable attributes.
       */
      if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
          (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
          (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
          ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
            return (EINVAL);
      }
      /*
       * Mark for update the file's access time for vfs_mark_atime().
       * We are doing this here to avoid some of the checks done
       * below -- this operation is done by request of the kernel and
       * should bypass some security checks.  Things like read-only
       * checks get handled by other levels (e.g., ffs_update()).
       */
      if (vap->va_vaflags & VA_MARK_ATIME) {
            ip->i_flag |= IN_ACCESS;
            return (0);
      }
      if (vap->va_flags != VNOVAL) {
            if (vp->v_mount->mnt_flag & MNT_RDONLY)
                  return (EROFS);
            /*
             * Callers may only modify the file flags on objects they
             * have VADMIN rights for.
             */
            if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
                  return (error);
            /*
             * Unprivileged processes are not permitted to unset system
             * flags, or modify flags if any system flags are set.
             * Privileged non-jail processes may not modify system flags
             * if securelevel > 0 and any existing system flags are set.
             * Privileged jail processes behave like privileged non-jail
             * processes if the security.jail.chflags_allowed sysctl is
             * is non-zero; otherwise, they behave like unprivileged
             * processes.
             */
            if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
                  if (ip->i_flags
                      & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
                        error = securelevel_gt(cred, 0);
                        if (error)
                              return (error);
                  }
                  /* Snapshot flag cannot be set or cleared */
                  if (((vap->va_flags & SF_SNAPSHOT) != 0 &&
                       (ip->i_flags & SF_SNAPSHOT) == 0) ||
                      ((vap->va_flags & SF_SNAPSHOT) == 0 &&
                       (ip->i_flags & SF_SNAPSHOT) != 0))
                        return (EPERM);
                  ip->i_flags = vap->va_flags;
                  DIP_SET(ip, i_flags, vap->va_flags);
            } else {
                  if (ip->i_flags
                      & (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
                      (vap->va_flags & UF_SETTABLE) != vap->va_flags)
                        return (EPERM);
                  ip->i_flags &= SF_SETTABLE;
                  ip->i_flags |= (vap->va_flags & UF_SETTABLE);
                  DIP_SET(ip, i_flags, ip->i_flags);
            }
            ip->i_flag |= IN_CHANGE;
            if (vap->va_flags & (IMMUTABLE | APPEND))
                  return (0);
      }
      if (ip->i_flags & (IMMUTABLE | APPEND))
            return (EPERM);
      /*
       * Go through the fields and update iff not VNOVAL.
       */
      if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
            if (vp->v_mount->mnt_flag & MNT_RDONLY)
                  return (EROFS);
            if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred,
                td)) != 0)
                  return (error);
      }
      if (vap->va_size != VNOVAL) {
            /*
             * XXX most of the following special cases should be in
             * callers instead of in N filesystems.  The VDIR check
             * mostly already is.
             */
            switch (vp->v_type) {
            case VDIR:
                  return (EISDIR);
            case VLNK:
            case VREG:
                  /*
                   * Truncation should have an effect in these cases.
                   * Disallow it if the filesystem is read-only or
                   * the file is being snapshotted.
                   */
                  if (vp->v_mount->mnt_flag & MNT_RDONLY)
                        return (EROFS);
                  if ((ip->i_flags & SF_SNAPSHOT) != 0)
                        return (EPERM);
                  break;
            default:
                  /*
                   * According to POSIX, the result is unspecified
                   * for file types other than regular files,
                   * directories and shared memory objects.  We
                   * don't support shared memory objects in the file
                   * system, and have dubious support for truncating
                   * symlinks.  Just ignore the request in other cases.
                   */
                  return (0);
            }
            if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL,
                cred, td)) != 0)
                  return (error);
      }
      if (vap->va_atime.tv_sec != VNOVAL ||
          vap->va_mtime.tv_sec != VNOVAL ||
          vap->va_birthtime.tv_sec != VNOVAL) {
            if (vp->v_mount->mnt_flag & MNT_RDONLY)
                  return (EROFS);
            if ((ip->i_flags & SF_SNAPSHOT) != 0)
                  return (EPERM);
            /*
             * From utimes(2):
             * If times is NULL, ... The caller must be the owner of
             * the file, have permission to write the file, or be the
             * super-user.
             * If times is non-NULL, ... The caller must be the owner of
             * the file or be the super-user.
             *
             * Possibly for historical reasons, try to use VADMIN in
             * preference to VWRITE for a NULL timestamp.  This means we
             * will return EACCES in preference to EPERM if neither
             * check succeeds.
             */
            if (vap->va_vaflags & VA_UTIMES_NULL) {
                  error = VOP_ACCESS(vp, VADMIN, cred, td);
                  if (error)
                        error = VOP_ACCESS(vp, VWRITE, cred, td);
            } else
                  error = VOP_ACCESS(vp, VADMIN, cred, td);
            if (error)
                  return (error);
            if (vap->va_atime.tv_sec != VNOVAL)
                  ip->i_flag |= IN_ACCESS;
            if (vap->va_mtime.tv_sec != VNOVAL)
                  ip->i_flag |= IN_CHANGE | IN_UPDATE;
            if (vap->va_birthtime.tv_sec != VNOVAL &&
                ip->i_ump->um_fstype == UFS2)
                  ip->i_flag |= IN_MODIFIED;
            ufs_itimes(vp);
            if (vap->va_atime.tv_sec != VNOVAL) {
                  DIP_SET(ip, i_atime, vap->va_atime.tv_sec);
                  DIP_SET(ip, i_atimensec, vap->va_atime.tv_nsec);
            }
            if (vap->va_mtime.tv_sec != VNOVAL) {
                  DIP_SET(ip, i_mtime, vap->va_mtime.tv_sec);
                  DIP_SET(ip, i_mtimensec, vap->va_mtime.tv_nsec);
            }
            if (vap->va_birthtime.tv_sec != VNOVAL &&
                ip->i_ump->um_fstype == UFS2) {
                  ip->i_din2->di_birthtime = vap->va_birthtime.tv_sec;
                  ip->i_din2->di_birthnsec = vap->va_birthtime.tv_nsec;
            }
            error = UFS_UPDATE(vp, 0);
            if (error)
                  return (error);
      }
      error = 0;
      if (vap->va_mode != (mode_t)VNOVAL) {
            if (vp->v_mount->mnt_flag & MNT_RDONLY)
                  return (EROFS);
            if ((ip->i_flags & SF_SNAPSHOT) != 0 && (vap->va_mode &
               (S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH)))
                  return (EPERM);
            error = ufs_chmod(vp, (int)vap->va_mode, cred, td);
      }
      return (error);
}

/*
 * Change the mode on a file.
 * Inode must be locked before calling.
 */
static int
ufs_chmod(vp, mode, cred, td)
      struct vnode *vp;
      int mode;
      struct ucred *cred;
      struct thread *td;
{
      struct inode *ip = VTOI(vp);
      int error;

      /*
       * To modify the permissions on a file, must possess VADMIN
       * for that file.
       */
      if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
            return (error);
      /*
       * Privileged processes may set the sticky bit on non-directories,
       * as well as set the setgid bit on a file with a group that the
       * process is not a member of.  Both of these are allowed in
       * jail(8).
       */
      if (vp->v_type != VDIR && (mode & S_ISTXT)) {
            if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0))
                  return (EFTYPE);
      }
      if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
            error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
            if (error)
                  return (error);
      }
      ip->i_mode &= ~ALLPERMS;
      ip->i_mode |= (mode & ALLPERMS);
      DIP_SET(ip, i_mode, ip->i_mode);
      ip->i_flag |= IN_CHANGE;
      return (0);
}

/*
 * Perform chown operation on inode ip;
 * inode must be locked prior to call.
 */
static int
ufs_chown(vp, uid, gid, cred, td)
      struct vnode *vp;
      uid_t uid;
      gid_t gid;
      struct ucred *cred;
      struct thread *td;
{
      struct inode *ip = VTOI(vp);
      uid_t ouid;
      gid_t ogid;
      int error = 0;
#ifdef QUOTA
      int i;
      ufs2_daddr_t change;
#endif

      if (uid == (uid_t)VNOVAL)
            uid = ip->i_uid;
      if (gid == (gid_t)VNOVAL)
            gid = ip->i_gid;
      /*
       * To modify the ownership of a file, must possess VADMIN for that
       * file.
       */
      if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
            return (error);
      /*
       * To change the owner of a file, or change the group of a file to a
       * group of which we are not a member, the caller must have
       * privilege.
       */
      if ((uid != ip->i_uid || 
          (gid != ip->i_gid && !groupmember(gid, cred))) &&
          (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0)))
            return (error);
      ogid = ip->i_gid;
      ouid = ip->i_uid;
#ifdef QUOTA
      if ((error = getinoquota(ip)) != 0)
            return (error);
      if (ouid == uid) {
            dqrele(vp, ip->i_dquot[USRQUOTA]);
            ip->i_dquot[USRQUOTA] = NODQUOT;
      }
      if (ogid == gid) {
            dqrele(vp, ip->i_dquot[GRPQUOTA]);
            ip->i_dquot[GRPQUOTA] = NODQUOT;
      }
      change = DIP(ip, i_blocks);
      (void) chkdq(ip, -change, cred, CHOWN);
      (void) chkiq(ip, -1, cred, CHOWN);
      for (i = 0; i < MAXQUOTAS; i++) {
            dqrele(vp, ip->i_dquot[i]);
            ip->i_dquot[i] = NODQUOT;
      }
#endif
      ip->i_gid = gid;
      DIP_SET(ip, i_gid, gid);
      ip->i_uid = uid;
      DIP_SET(ip, i_uid, uid);
#ifdef QUOTA
      if ((error = getinoquota(ip)) == 0) {
            if (ouid == uid) {
                  dqrele(vp, ip->i_dquot[USRQUOTA]);
                  ip->i_dquot[USRQUOTA] = NODQUOT;
            }
            if (ogid == gid) {
                  dqrele(vp, ip->i_dquot[GRPQUOTA]);
                  ip->i_dquot[GRPQUOTA] = NODQUOT;
            }
            if ((error = chkdq(ip, change, cred, CHOWN)) == 0) {
                  if ((error = chkiq(ip, 1, cred, CHOWN)) == 0)
                        goto good;
                  else
                        (void) chkdq(ip, -change, cred, CHOWN|FORCE);
            }
            for (i = 0; i < MAXQUOTAS; i++) {
                  dqrele(vp, ip->i_dquot[i]);
                  ip->i_dquot[i] = NODQUOT;
            }
      }
      ip->i_gid = ogid;
      DIP_SET(ip, i_gid, ogid);
      ip->i_uid = ouid;
      DIP_SET(ip, i_uid, ouid);
      if (getinoquota(ip) == 0) {
            if (ouid == uid) {
                  dqrele(vp, ip->i_dquot[USRQUOTA]);
                  ip->i_dquot[USRQUOTA] = NODQUOT;
            }
            if (ogid == gid) {
                  dqrele(vp, ip->i_dquot[GRPQUOTA]);
                  ip->i_dquot[GRPQUOTA] = NODQUOT;
            }
            (void) chkdq(ip, change, cred, FORCE|CHOWN);
            (void) chkiq(ip, 1, cred, FORCE|CHOWN);
            (void) getinoquota(ip);
      }
      return (error);
good:
      if (getinoquota(ip))
            panic("ufs_chown: lost quota");
#endif /* QUOTA */
      ip->i_flag |= IN_CHANGE;
      if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
            if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) {
                  ip->i_mode &= ~(ISUID | ISGID);
                  DIP_SET(ip, i_mode, ip->i_mode);
            }
      }
      return (0);
}

static int
ufs_remove(ap)
      struct vop_remove_args /* {
            struct vnode *a_dvp;
            struct vnode *a_vp;
            struct componentname *a_cnp;
      } */ *ap;
{
      struct inode *ip;
      struct vnode *vp = ap->a_vp;
      struct vnode *dvp = ap->a_dvp;
      int error;
      struct thread *td;

      td = curthread;
      ip = VTOI(vp);
      if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
          (VTOI(dvp)->i_flags & APPEND)) {
            error = EPERM;
            goto out;
      }
#ifdef UFS_GJOURNAL
      ufs_gjournal_orphan(vp);
#endif
      error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
      if (ip->i_nlink <= 0)
            vp->v_vflag |= VV_NOSYNC;
      if ((ip->i_flags & SF_SNAPSHOT) != 0) {
            /*
             * Avoid deadlock where another thread is trying to
             * update the inodeblock for dvp and is waiting on
             * snaplk.  Temporary unlock the vnode lock for the
             * unlinked file and sync the directory.  This should
             * allow vput() of the directory to not block later on
             * while holding the snapshot vnode locked, assuming
             * that the directory hasn't been unlinked too.
             */
            VOP_UNLOCK(vp, 0, td);
            (void) VOP_FSYNC(dvp, MNT_WAIT, td);
            vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
      }
out:
      return (error);
}

/*
 * link vnode call
 */
static int
ufs_link(ap)
      struct vop_link_args /* {
            struct vnode *a_tdvp;
            struct vnode *a_vp;
            struct componentname *a_cnp;
      } */ *ap;
{
      struct vnode *vp = ap->a_vp;
      struct vnode *tdvp = ap->a_tdvp;
      struct componentname *cnp = ap->a_cnp;
      struct inode *ip;
      struct direct newdir;
      int error;

#ifdef DIAGNOSTIC
      if ((cnp->cn_flags & HASBUF) == 0)
            panic("ufs_link: no name");
#endif
      if (tdvp->v_mount != vp->v_mount) {
            error = EXDEV;
            goto out;
      }
      ip = VTOI(vp);
      if ((nlink_t)ip->i_nlink >= LINK_MAX) {
            error = EMLINK;
            goto out;
      }
      if (ip->i_flags & (IMMUTABLE | APPEND)) {
            error = EPERM;
            goto out;
      }
      ip->i_effnlink++;
      ip->i_nlink++;
      DIP_SET(ip, i_nlink, ip->i_nlink);
      ip->i_flag |= IN_CHANGE;
      if (DOINGSOFTDEP(vp))
            softdep_change_linkcnt(ip);
      error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp)));
      if (!error) {
            ufs_makedirentry(ip, cnp, &newdir);
            error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL);
      }

      if (error) {
            ip->i_effnlink--;
            ip->i_nlink--;
            DIP_SET(ip, i_nlink, ip->i_nlink);
            ip->i_flag |= IN_CHANGE;
            if (DOINGSOFTDEP(vp))
                  softdep_change_linkcnt(ip);
      }
out:
      return (error);
}

/*
 * whiteout vnode call
 */
static int
ufs_whiteout(ap)
      struct vop_whiteout_args /* {
            struct vnode *a_dvp;
            struct componentname *a_cnp;
            int a_flags;
      } */ *ap;
{
      struct vnode *dvp = ap->a_dvp;
      struct componentname *cnp = ap->a_cnp;
      struct direct newdir;
      int error = 0;

      switch (ap->a_flags) {
      case LOOKUP:
            /* 4.4 format directories support whiteout operations */
            if (dvp->v_mount->mnt_maxsymlinklen > 0)
                  return (0);
            return (EOPNOTSUPP);

      case CREATE:
            /* create a new directory whiteout */
#ifdef DIAGNOSTIC
            if ((cnp->cn_flags & SAVENAME) == 0)
                  panic("ufs_whiteout: missing name");
            if (dvp->v_mount->mnt_maxsymlinklen <= 0)
                  panic("ufs_whiteout: old format filesystem");
#endif

            newdir.d_ino = WINO;
            newdir.d_namlen = cnp->cn_namelen;
            bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1);
            newdir.d_type = DT_WHT;
            error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL);
            break;

      case DELETE:
            /* remove an existing directory whiteout */
#ifdef DIAGNOSTIC
            if (dvp->v_mount->mnt_maxsymlinklen <= 0)
                  panic("ufs_whiteout: old format filesystem");
#endif

            cnp->cn_flags &= ~DOWHITEOUT;
            error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0);
            break;
      default:
            panic("ufs_whiteout: unknown op");
      }
      return (error);
}

/*
 * Rename system call.
 *    rename("foo", "bar");
 * is essentially
 *    unlink("bar");
 *    link("foo", "bar");
 *    unlink("foo");
 * but ``atomically''.  Can't do full commit without saving state in the
 * inode on disk which isn't feasible at this time.  Best we can do is
 * always guarantee the target exists.
 *
 * Basic algorithm is:
 *
 * 1) Bump link count on source while we're linking it to the
 *    target.  This also ensure the inode won't be deleted out
 *    from underneath us while we work (it may be truncated by
 *    a concurrent `trunc' or `open' for creation).
 * 2) Link source to destination.  If destination already exists,
 *    delete it first.
 * 3) Unlink source reference to inode if still around. If a
 *    directory was moved and the parent of the destination
 *    is different from the source, patch the ".." entry in the
 *    directory.
 */
static int
ufs_rename(ap)
      struct vop_rename_args  /* {
            struct vnode *a_fdvp;
            struct vnode *a_fvp;
            struct componentname *a_fcnp;
            struct vnode *a_tdvp;
            struct vnode *a_tvp;
            struct componentname *a_tcnp;
      } */ *ap;
{
      struct vnode *tvp = ap->a_tvp;
      struct vnode *tdvp = ap->a_tdvp;
      struct vnode *fvp = ap->a_fvp;
      struct vnode *fdvp = ap->a_fdvp;
      struct componentname *tcnp = ap->a_tcnp;
      struct componentname *fcnp = ap->a_fcnp;
      struct thread *td = fcnp->cn_thread;
      struct inode *ip, *xp, *dp;
      struct direct newdir;
      int doingdirectory = 0, oldparent = 0, newparent = 0;
      int error = 0, ioflag;

#ifdef DIAGNOSTIC
      if ((tcnp->cn_flags & HASBUF) == 0 ||
          (fcnp->cn_flags & HASBUF) == 0)
            panic("ufs_rename: no name");
#endif
      /*
       * Check for cross-device rename.
       */
      if ((fvp->v_mount != tdvp->v_mount) ||
          (tvp && (fvp->v_mount != tvp->v_mount))) {
            error = EXDEV;
abortit:
            if (tdvp == tvp)
                  vrele(tdvp);
            else
                  vput(tdvp);
            if (tvp)
                  vput(tvp);
            vrele(fdvp);
            vrele(fvp);
            return (error);
      }

      if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
          (VTOI(tdvp)->i_flags & APPEND))) {
            error = EPERM;
            goto abortit;
      }

      /*
       * Renaming a file to itself has no effect.  The upper layers should
       * not call us in that case.  Temporarily just warn if they do.
       */
      if (fvp == tvp) {
            printf("ufs_rename: fvp == tvp (can't happen)\n");
            error = 0;
            goto abortit;
      }

      if ((error = vn_lock(fvp, LK_EXCLUSIVE, td)) != 0)
            goto abortit;
      dp = VTOI(fdvp);
      ip = VTOI(fvp);
      if (ip->i_nlink >= LINK_MAX) {
            VOP_UNLOCK(fvp, 0, td);
            error = EMLINK;
            goto abortit;
      }
      if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
          || (dp->i_flags & APPEND)) {
            VOP_UNLOCK(fvp, 0, td);
            error = EPERM;
            goto abortit;
      }
      if ((ip->i_mode & IFMT) == IFDIR) {
            /*
             * Avoid ".", "..", and aliases of "." for obvious reasons.
             */
            if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
                dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
                (ip->i_flag & IN_RENAME)) {
                  VOP_UNLOCK(fvp, 0, td);
                  error = EINVAL;
                  goto abortit;
            }
            ip->i_flag |= IN_RENAME;
            oldparent = dp->i_number;
            doingdirectory = 1;
      }
      vrele(fdvp);

      /*
       * When the target exists, both the directory
       * and target vnodes are returned locked.
       */
      dp = VTOI(tdvp);
      xp = NULL;
      if (tvp)
            xp = VTOI(tvp);

      /*
       * 1) Bump link count while we're moving stuff
       *    around.  If we crash somewhere before
       *    completing our work, the link count
       *    may be wrong, but correctable.
       */
      ip->i_effnlink++;
      ip->i_nlink++;
      DIP_SET(ip, i_nlink, ip->i_nlink);
      ip->i_flag |= IN_CHANGE;
      if (DOINGSOFTDEP(fvp))
            softdep_change_linkcnt(ip);
      if ((error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) |
                               DOINGASYNC(fvp)))) != 0) {
            VOP_UNLOCK(fvp, 0, td);
            goto bad;
      }

      /*
       * If ".." must be changed (ie the directory gets a new
       * parent) then the source directory must not be in the
       * directory hierarchy above the target, as this would
       * orphan everything below the source directory. Also
       * the user must have write permission in the source so
       * as to be able to change "..". We must repeat the call
       * to namei, as the parent directory is unlocked by the
       * call to checkpath().
       */
      error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
      VOP_UNLOCK(fvp, 0, td);
      if (oldparent != dp->i_number)
            newparent = dp->i_number;
      if (doingdirectory && newparent) {
            if (error)  /* write access check above */
                  goto bad;
            if (xp != NULL)
                  vput(tvp);
            error = ufs_checkpath(ip, dp, tcnp->cn_cred);
            if (error)
                  goto out;
            if ((tcnp->cn_flags & SAVESTART) == 0)
                  panic("ufs_rename: lost to startdir");
            VREF(tdvp);
            error = relookup(tdvp, &tvp, tcnp);
            if (error)
                  goto out;
            vrele(tdvp);
            dp = VTOI(tdvp);
            xp = NULL;
            if (tvp)
                  xp = VTOI(tvp);
      }
      /*
       * 2) If target doesn't exist, link the target
       *    to the source and unlink the source.
       *    Otherwise, rewrite the target directory
       *    entry to reference the source inode and
       *    expunge the original entry's existence.
       */
      if (xp == NULL) {
            if (dp->i_dev != ip->i_dev)
                  panic("ufs_rename: EXDEV");
            /*
             * Account for ".." in new directory.
             * When source and destination have the same
             * parent we don't fool with the link count.
             */
            if (doingdirectory && newparent) {
                  if ((nlink_t)dp->i_nlink >= LINK_MAX) {
                        error = EMLINK;
                        goto bad;
                  }
                  dp->i_effnlink++;
                  dp->i_nlink++;
                  DIP_SET(dp, i_nlink, dp->i_nlink);
                  dp->i_flag |= IN_CHANGE;
                  if (DOINGSOFTDEP(tdvp))
                        softdep_change_linkcnt(dp);
                  error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) |
                                       DOINGASYNC(tdvp)));
                  if (error)
                        goto bad;
            }
            ufs_makedirentry(ip, tcnp, &newdir);
            error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL);
            if (error) {
                  if (doingdirectory && newparent) {
                        dp->i_effnlink--;
                        dp->i_nlink--;
                        DIP_SET(dp, i_nlink, dp->i_nlink);
                        dp->i_flag |= IN_CHANGE;
                        if (DOINGSOFTDEP(tdvp))
                              softdep_change_linkcnt(dp);
                        (void)UFS_UPDATE(tdvp, 1);
                  }
                  goto bad;
            }
            vput(tdvp);
      } else {
            if (xp->i_dev != dp->i_dev || xp->i_dev != ip->i_dev)
                  panic("ufs_rename: EXDEV");
            /*
             * Short circuit rename(foo, foo).
             */
            if (xp->i_number == ip->i_number)
                  panic("ufs_rename: same file");
            /*
             * If the parent directory is "sticky", then the caller
             * must possess VADMIN for the parent directory, or the
             * destination of the rename.  This implements append-only
             * directories.
             */
            if ((dp->i_mode & S_ISTXT) &&
                VOP_ACCESS(tdvp, VADMIN, tcnp->cn_cred, td) &&
                VOP_ACCESS(tvp, VADMIN, tcnp->cn_cred, td)) {
                  error = EPERM;
                  goto bad;
            }
            /*
             * Target must be empty if a directory and have no links
             * to it. Also, ensure source and target are compatible
             * (both directories, or both not directories).
             */
            if ((xp->i_mode&IFMT) == IFDIR) {
                  if ((xp->i_effnlink > 2) ||
                      !ufs_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
                        error = ENOTEMPTY;
                        goto bad;
                  }
                  if (!doingdirectory) {
                        error = ENOTDIR;
                        goto bad;
                  }
                  cache_purge(tdvp);
            } else if (doingdirectory) {
                  error = EISDIR;
                  goto bad;
            }
            error = ufs_dirrewrite(dp, xp, ip->i_number,
                IFTODT(ip->i_mode),
                (doingdirectory && newparent) ? newparent : doingdirectory);
            if (error)
                  goto bad;
            if (doingdirectory) {
                  if (!newparent) {
                        dp->i_effnlink--;
                        if (DOINGSOFTDEP(tdvp))
                              softdep_change_linkcnt(dp);
                  }
                  xp->i_effnlink--;
                  if (DOINGSOFTDEP(tvp))
                        softdep_change_linkcnt(xp);
            }
            if (doingdirectory && !DOINGSOFTDEP(tvp)) {
                  /*
                   * Truncate inode. The only stuff left in the directory
                   * is "." and "..". The "." reference is inconsequential
                   * since we are quashing it. We have removed the "."
                   * reference and the reference in the parent directory,
                   * but there may be other hard links. The soft
                   * dependency code will arrange to do these operations
                   * after the parent directory entry has been deleted on
                   * disk, so when running with that code we avoid doing
                   * them now.
                   */
                  if (!newparent) {
                        dp->i_nlink--;
                        DIP_SET(dp, i_nlink, dp->i_nlink);
                        dp->i_flag |= IN_CHANGE;
                  }
                  xp->i_nlink--;
                  DIP_SET(xp, i_nlink, xp->i_nlink);
                  xp->i_flag |= IN_CHANGE;
                  ioflag = IO_NORMAL;
                  if (!DOINGASYNC(tvp))
                        ioflag |= IO_SYNC;
                  if ((error = UFS_TRUNCATE(tvp, (off_t)0, ioflag,
                      tcnp->cn_cred, tcnp->cn_thread)) != 0)
                        goto bad;
            }
            vput(tdvp);
            vput(tvp);
            xp = NULL;
      }

      /*
       * 3) Unlink the source.
       */
      fcnp->cn_flags &= ~MODMASK;
      fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
      if ((fcnp->cn_flags & SAVESTART) == 0)
            panic("ufs_rename: lost from startdir");
      VREF(fdvp);
      error = relookup(fdvp, &fvp, fcnp);
      if (error == 0)
            vrele(fdvp);
      if (fvp != NULL) {
            xp = VTOI(fvp);
            dp = VTOI(fdvp);
      } else {
            /*
             * From name has disappeared.  IN_RENAME is not sufficient
             * to protect against directory races due to timing windows,
             * so we have to remove the panic.  XXX the only real way
             * to solve this issue is at a much higher level.  By the
             * time we hit ufs_rename() it's too late.
             */
#if 0
            if (doingdirectory)
                  panic("ufs_rename: lost dir entry");
#endif
            vrele(ap->a_fvp);
            return (0);
      }
      /*
       * Ensure that the directory entry still exists and has not
       * changed while the new name has been entered. If the source is
       * a file then the entry may have been unlinked or renamed. In
       * either case there is no further work to be done. If the source
       * is a directory then it cannot have been rmdir'ed; the IN_RENAME
       * flag ensures that it cannot be moved by another rename or removed
       * by a rmdir.
       */
      if (xp != ip) {
            /*
             * From name resolves to a different inode.  IN_RENAME is
             * not sufficient protection against timing window races
             * so we can't panic here.  XXX the only real way
             * to solve this issue is at a much higher level.  By the
             * time we hit ufs_rename() it's too late.
             */
#if 0
            if (doingdirectory)
                  panic("ufs_rename: lost dir entry");
#endif
      } else {
            /*
             * If the source is a directory with a
             * new parent, the link count of the old
             * parent directory must be decremented
             * and ".." set to point to the new parent.
             */
            if (doingdirectory && newparent) {
                  xp->i_offset = mastertemplate.dot_reclen;
                  ufs_dirrewrite(xp, dp, newparent, DT_DIR, 0);
                  cache_purge(fdvp);
            }
            error = ufs_dirremove(fdvp, xp, fcnp->cn_flags, 0);
            xp->i_flag &= ~IN_RENAME;
      }
      if (dp)
            vput(fdvp);
      if (xp)
            vput(fvp);
      vrele(ap->a_fvp);
      return (error);

bad:
      if (xp)
            vput(ITOV(xp));
      vput(ITOV(dp));
out:
      if (doingdirectory)
            ip->i_flag &= ~IN_RENAME;
      if (vn_lock(fvp, LK_EXCLUSIVE, td) == 0) {
            ip->i_effnlink--;
            ip->i_nlink--;
            DIP_SET(ip, i_nlink, ip->i_nlink);
            ip->i_flag |= IN_CHANGE;
            ip->i_flag &= ~IN_RENAME;
            if (DOINGSOFTDEP(fvp))
                  softdep_change_linkcnt(ip);
            vput(fvp);
      } else
            vrele(fvp);
      return (error);
}

/*
 * Mkdir system call
 */
static int
ufs_mkdir(ap)
      struct vop_mkdir_args /* {
            struct vnode *a_dvp;
            struct vnode **a_vpp;
            struct componentname *a_cnp;
            struct vattr *a_vap;
      } */ *ap;
{
      struct vnode *dvp = ap->a_dvp;
      struct vattr *vap = ap->a_vap;
      struct componentname *cnp = ap->a_cnp;
      struct inode *ip, *dp;
      struct vnode *tvp;
      struct buf *bp;
      struct dirtemplate dirtemplate, *dtp;
      struct direct newdir;
#ifdef UFS_ACL
      struct acl *acl, *dacl;
#endif
      int error, dmode;
      long blkoff;

#ifdef DIAGNOSTIC
      if ((cnp->cn_flags & HASBUF) == 0)
            panic("ufs_mkdir: no name");
#endif
      dp = VTOI(dvp);
      if ((nlink_t)dp->i_nlink >= LINK_MAX) {
            error = EMLINK;
            goto out;
      }
      dmode = vap->va_mode & 0777;
      dmode |= IFDIR;
      /*
       * Must simulate part of ufs_makeinode here to acquire the inode,
       * but not have it entered in the parent directory. The entry is
       * made later after writing "." and ".." entries.
       */
      error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp);
      if (error)
            goto out;
      ip = VTOI(tvp);
      ip->i_gid = dp->i_gid;
      DIP_SET(ip, i_gid, dp->i_gid);
#ifdef SUIDDIR
      {
#ifdef QUOTA
            struct ucred ucred, *ucp;
            ucp = cnp->cn_cred;
#endif
            /*
             * If we are hacking owners here, (only do this where told to)
             * and we are not giving it TO root, (would subvert quotas)
             * then go ahead and give it to the other user.
             * The new directory also inherits the SUID bit.
             * If user's UID and dir UID are the same,
             * 'give it away' so that the SUID is still forced on.
             */
            if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
                (dp->i_mode & ISUID) && dp->i_uid) {
                  dmode |= ISUID;
                  ip->i_uid = dp->i_uid;
                  DIP_SET(ip, i_uid, dp->i_uid);
#ifdef QUOTA
                  if (dp->i_uid != cnp->cn_cred->cr_uid) {
                        /*
                         * Make sure the correct user gets charged
                         * for the space.
                         * Make a dummy credential for the victim.
                         * XXX This seems to never be accessed out of
                         * our context so a stack variable is ok.
                         */
                        refcount_init(&ucred.cr_ref, 1);
                        ucred.cr_uid = ip->i_uid;
                        ucred.cr_ngroups = 1;
                        ucred.cr_groups[0] = dp->i_gid;
                        ucp = &ucred;
                  }
#endif
            } else {
                  ip->i_uid = cnp->cn_cred->cr_uid;
                  DIP_SET(ip, i_uid, ip->i_uid);
            }
#ifdef QUOTA
            if ((error = getinoquota(ip)) ||
                (error = chkiq(ip, 1, ucp, 0))) {
                  UFS_VFREE(tvp, ip->i_number, dmode);
                  vput(tvp);
                  return (error);
            }
#endif
      }
#else /* !SUIDDIR */
      ip->i_uid = cnp->cn_cred->cr_uid;
      DIP_SET(ip, i_uid, ip->i_uid);
#ifdef QUOTA
      if ((error = getinoquota(ip)) ||
          (error = chkiq(ip, 1, cnp->cn_cred, 0))) {
            UFS_VFREE(tvp, ip->i_number, dmode);
            vput(tvp);
            return (error);
      }
#endif
#endif      /* !SUIDDIR */
      ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
#ifdef UFS_ACL
      acl = dacl = NULL;
      if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) {
            acl = uma_zalloc(acl_zone, M_WAITOK);
            dacl = uma_zalloc(acl_zone, M_WAITOK);

            /*
             * Retrieve default ACL from parent, if any.
             */
            error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred,
                cnp->cn_thread);
            switch (error) {
            case 0:
                  /*
                   * Retrieved a default ACL, so merge mode and ACL if
                   * necessary.  If the ACL is empty, fall through to
                   * the "not defined or available" case.
                   */
                  if (acl->acl_cnt != 0) {
                        dmode = acl_posix1e_newfilemode(dmode, acl);
                        ip->i_mode = dmode;
                        DIP_SET(ip, i_mode, dmode);
                        *dacl = *acl;
                        ufs_sync_acl_from_inode(ip, acl);
                        break;
                  }
                  /* FALLTHROUGH */
      
            case EOPNOTSUPP:
                  /*
                   * Just use the mode as-is.
                   */
                  ip->i_mode = dmode;
                  DIP_SET(ip, i_mode, dmode);
                  uma_zfree(acl_zone, acl);
                  uma_zfree(acl_zone, dacl);
                  dacl = acl = NULL;
                  break;
            
            default:
                  UFS_VFREE(tvp, ip->i_number, dmode);
                  vput(tvp);
                  uma_zfree(acl_zone, acl);
                  uma_zfree(acl_zone, dacl);
                  return (error);
            }
      } else {
#endif /* !UFS_ACL */
            ip->i_mode = dmode;
            DIP_SET(ip, i_mode, dmode);
#ifdef UFS_ACL
      }
#endif
      tvp->v_type = VDIR;     /* Rest init'd in getnewvnode(). */
      ip->i_effnlink = 2;
      ip->i_nlink = 2;
      DIP_SET(ip, i_nlink, 2);
      if (DOINGSOFTDEP(tvp))
            softdep_change_linkcnt(ip);
      if (cnp->cn_flags & ISWHITEOUT) {
            ip->i_flags |= UF_OPAQUE;
            DIP_SET(ip, i_flags, ip->i_flags);
      }

      /*
       * Bump link count in parent directory to reflect work done below.
       * Should be done before reference is created so cleanup is
       * possible if we crash.
       */
      dp->i_effnlink++;
      dp->i_nlink++;
      DIP_SET(dp, i_nlink, dp->i_nlink);
      dp->i_flag |= IN_CHANGE;
      if (DOINGSOFTDEP(dvp))
            softdep_change_linkcnt(dp);
      error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp)));
      if (error)
            goto bad;
#ifdef MAC
      if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) {
            error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount,
                dvp, tvp, cnp);
            if (error)
                  goto bad;
      }
#endif
#ifdef UFS_ACL
      if (acl != NULL) {
            /*
             * XXX: If we abort now, will Soft Updates notify the extattr
             * code that the EAs for the file need to be released?
             */
            error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred,
                cnp->cn_thread);
            if (error == 0)
                  error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl,
                      cnp->cn_cred, cnp->cn_thread);
            switch (error) {
            case 0:
                  break;

            case EOPNOTSUPP:
                  /*
                   * XXX: This should not happen, as EOPNOTSUPP above
                   * was supposed to free acl.
                   */
                  printf("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()\n");
                  /*
                  panic("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()");
                   */
                  break;

            default:
                  uma_zfree(acl_zone, acl);
                  uma_zfree(acl_zone, dacl);
                  dacl = acl = NULL;
                  goto bad;
            }
            uma_zfree(acl_zone, acl);
            uma_zfree(acl_zone, dacl);
            dacl = acl = NULL;
      }
#endif /* !UFS_ACL */

      /*
       * Initialize directory with "." and ".." from static template.
       */
      if (dvp->v_mount->mnt_maxsymlinklen > 0)
            dtp = &mastertemplate;
      else
            dtp = (struct dirtemplate *)&omastertemplate;
      dirtemplate = *dtp;
      dirtemplate.dot_ino = ip->i_number;
      dirtemplate.dotdot_ino = dp->i_number;
      if ((error = UFS_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred,
          BA_CLRBUF, &bp)) != 0)
            goto bad;
      ip->i_size = DIRBLKSIZ;
      DIP_SET(ip, i_size, DIRBLKSIZ);
      ip->i_flag |= IN_CHANGE | IN_UPDATE;
      vnode_pager_setsize(tvp, (u_long)ip->i_size);
      bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate);
      if (DOINGSOFTDEP(tvp)) {
            /*
             * Ensure that the entire newly allocated block is a
             * valid directory so that future growth within the
             * block does not have to ensure that the block is
             * written before the inode.
             */
            blkoff = DIRBLKSIZ;
            while (blkoff < bp->b_bcount) {
                  ((struct direct *)
                     (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ;
                  blkoff += DIRBLKSIZ;
            }
      }
      if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) |
                               DOINGASYNC(tvp)))) != 0) {
            (void)bwrite(bp);
            goto bad;
      }
      /*
       * Directory set up, now install its entry in the parent directory.
       *
       * If we are not doing soft dependencies, then we must write out the
       * buffer containing the new directory body before entering the new 
       * name in the parent. If we are doing soft dependencies, then the
       * buffer containing the new directory body will be passed to and
       * released in the soft dependency code after the code has attached
       * an appropriate ordering dependency to the buffer which ensures that
       * the buffer is written before the new name is written in the parent.
       */
      if (DOINGASYNC(dvp))
            bdwrite(bp);
      else if (!DOINGSOFTDEP(dvp) && ((error = bwrite(bp))))
            goto bad;
      ufs_makedirentry(ip, cnp, &newdir);
      error = ufs_direnter(dvp, tvp, &newdir, cnp, bp);
      
bad:
      if (error == 0) {
            *ap->a_vpp = tvp;
      } else {
#ifdef UFS_ACL
            if (acl != NULL)
                  uma_zfree(acl_zone, acl);
            if (dacl != NULL)
                  uma_zfree(acl_zone, dacl);
#endif
            dp->i_effnlink--;
            dp->i_nlink--;
            DIP_SET(dp, i_nlink, dp->i_nlink);
            dp->i_flag |= IN_CHANGE;
            if (DOINGSOFTDEP(dvp))
                  softdep_change_linkcnt(dp);
            /*
             * No need to do an explicit VOP_TRUNCATE here, vrele will
             * do this for us because we set the link count to 0.
             */
            ip->i_effnlink = 0;
            ip->i_nlink = 0;
            DIP_SET(ip, i_nlink, 0);
            ip->i_flag |= IN_CHANGE;
            if (DOINGSOFTDEP(tvp))
                  softdep_change_linkcnt(ip);
            vput(tvp);
      }
out:
      return (error);
}

/*
 * Rmdir system call.
 */
static int
ufs_rmdir(ap)
      struct vop_rmdir_args /* {
            struct vnode *a_dvp;
            struct vnode *a_vp;
            struct componentname *a_cnp;
      } */ *ap;
{
      struct vnode *vp = ap->a_vp;
      struct vnode *dvp = ap->a_dvp;
      struct componentname *cnp = ap->a_cnp;
      struct inode *ip, *dp;
      int error, ioflag;

      ip = VTOI(vp);
      dp = VTOI(dvp);

      /*
       * Do not remove a directory that is in the process of being renamed.
       * Verify the directory is empty (and valid). Rmdir ".." will not be
       * valid since ".." will contain a reference to the current directory
       * and thus be non-empty. Do not allow the removal of mounted on
       * directories (this can happen when an NFS exported filesystem
       * tries to remove a locally mounted on directory).
       */
      error = 0;
      if ((ip->i_flag & IN_RENAME) || ip->i_effnlink < 2) {
            error = EINVAL;
            goto out;
      }
      if (!ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
            error = ENOTEMPTY;
            goto out;
      }
      if ((dp->i_flags & APPEND)
          || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
            error = EPERM;
            goto out;
      }
      if (vp->v_mountedhere != 0) {
            error = EINVAL;
            goto out;
      }
#ifdef UFS_GJOURNAL
      ufs_gjournal_orphan(vp);
#endif
      /*
       * Delete reference to directory before purging
       * inode.  If we crash in between, the directory
       * will be reattached to lost+found,
       */
      dp->i_effnlink--;
      ip->i_effnlink--;
      if (DOINGSOFTDEP(vp)) {
            softdep_change_linkcnt(dp);
            softdep_change_linkcnt(ip);
      }
      error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1);
      if (error) {
            dp->i_effnlink++;
            ip->i_effnlink++;
            if (DOINGSOFTDEP(vp)) {
                  softdep_change_linkcnt(dp);
                  softdep_change_linkcnt(ip);
            }
            goto out;
      }
      cache_purge(dvp);
      /*
       * Truncate inode. The only stuff left in the directory is "." and
       * "..". The "." reference is inconsequential since we are quashing
       * it. The soft dependency code will arrange to do these operations
       * after the parent directory entry has been deleted on disk, so
       * when running with that code we avoid doing them now.
       */
      if (!DOINGSOFTDEP(vp)) {
            dp->i_nlink--;
            DIP_SET(dp, i_nlink, dp->i_nlink);
            dp->i_flag |= IN_CHANGE;
            ip->i_nlink--;
            DIP_SET(ip, i_nlink, ip->i_nlink);
            ip->i_flag |= IN_CHANGE;
            ioflag = IO_NORMAL;
            if (!DOINGASYNC(vp))
                  ioflag |= IO_SYNC;
            error = UFS_TRUNCATE(vp, (off_t)0, ioflag, cnp->cn_cred,
                cnp->cn_thread);
      }
      cache_purge(vp);
#ifdef UFS_DIRHASH
      /* Kill any active hash; i_effnlink == 0, so it will not come back. */
      if (ip->i_dirhash != NULL)
            ufsdirhash_free(ip);
#endif
out:
      return (error);
}

/*
 * symlink -- make a symbolic link
 */
static int
ufs_symlink(ap)
      struct vop_symlink_args /* {
            struct vnode *a_dvp;
            struct vnode **a_vpp;
            struct componentname *a_cnp;
            struct vattr *a_vap;
            char *a_target;
      } */ *ap;
{
      struct vnode *vp, **vpp = ap->a_vpp;
      struct inode *ip;
      int len, error;

      error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
          vpp, ap->a_cnp);
      if (error)
            return (error);
      vp = *vpp;
      len = strlen(ap->a_target);
      if (len < vp->v_mount->mnt_maxsymlinklen) {
            ip = VTOI(vp);
            bcopy(ap->a_target, SHORTLINK(ip), len);
            ip->i_size = len;
            DIP_SET(ip, i_size, len);
            ip->i_flag |= IN_CHANGE | IN_UPDATE;
      } else
            error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
                UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
                ap->a_cnp->cn_cred, NOCRED, (int *)0, (struct thread *)0);
      if (error)
            vput(vp);
      return (error);
}

/*
 * Vnode op for reading directories.
 *
 * The routine below assumes that the on-disk format of a directory
 * is the same as that defined by <sys/dirent.h>. If the on-disk
 * format changes, then it will be necessary to do a conversion
 * from the on-disk format that read returns to the format defined
 * by <sys/dirent.h>.
 */
int
ufs_readdir(ap)
      struct vop_readdir_args /* {
            struct vnode *a_vp;
            struct uio *a_uio;
            struct ucred *a_cred;
            int *a_eofflag;
            int *a_ncookies;
            u_long **a_cookies;
      } */ *ap;
{
      struct uio *uio = ap->a_uio;
      int error;
      size_t count, lost;
      off_t off;

      if (ap->a_ncookies != NULL)
            /*
             * Ensure that the block is aligned.  The caller can use
             * the cookies to determine where in the block to start.
             */
            uio->uio_offset &= ~(DIRBLKSIZ - 1);
      off = uio->uio_offset;
      count = uio->uio_resid;
      /* Make sure we don't return partial entries. */
      if (count <= ((uio->uio_offset + count) & (DIRBLKSIZ -1)))
            return (EINVAL);
      count -= (uio->uio_offset + count) & (DIRBLKSIZ -1);
      lost = uio->uio_resid - count;
      uio->uio_resid = count;
      uio->uio_iov->iov_len = count;
#     if (BYTE_ORDER == LITTLE_ENDIAN)
            if (ap->a_vp->v_mount->mnt_maxsymlinklen > 0) {
                  error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
            } else {
                  struct dirent *dp, *edp;
                  struct uio auio;
                  struct iovec aiov;
                  caddr_t dirbuf;
                  int readcnt;
                  u_char tmp;

                  auio = *uio;
                  auio.uio_iov = &aiov;
                  auio.uio_iovcnt = 1;
                  auio.uio_segflg = UIO_SYSSPACE;
                  aiov.iov_len = count;
                  MALLOC(dirbuf, caddr_t, count, M_TEMP, M_WAITOK);
                  aiov.iov_base = dirbuf;
                  error = VOP_READ(ap->a_vp, &auio, 0, ap->a_cred);
                  if (error == 0) {
                        readcnt = count - auio.uio_resid;
                        edp = (struct dirent *)&dirbuf[readcnt];
                        for (dp = (struct dirent *)dirbuf; dp < edp; ) {
                              tmp = dp->d_namlen;
                              dp->d_namlen = dp->d_type;
                              dp->d_type = tmp;
                              if (dp->d_reclen > 0) {
                                    dp = (struct dirent *)
                                        ((char *)dp + dp->d_reclen);
                              } else {
                                    error = EIO;
                                    break;
                              }
                        }
                        if (dp >= edp)
                              error = uiomove(dirbuf, readcnt, uio);
                  }
                  FREE(dirbuf, M_TEMP);
            }
#     else
            error = VOP_READ(ap->a_vp, uio, 0, ap->a_cred);
#     endif
      if (!error && ap->a_ncookies != NULL) {
            struct dirent* dpStart;
            struct dirent* dpEnd;
            struct dirent* dp;
            int ncookies;
            u_long *cookies;
            u_long *cookiep;

            if (uio->uio_segflg != UIO_SYSSPACE || uio->uio_iovcnt != 1)
                  panic("ufs_readdir: unexpected uio from NFS server");
            dpStart = (struct dirent *)
                ((char *)uio->uio_iov->iov_base - (uio->uio_offset - off));
            dpEnd = (struct dirent *) uio->uio_iov->iov_base;
            for (dp = dpStart, ncookies = 0;
                 dp < dpEnd;
                 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen))
                  ncookies++;
            MALLOC(cookies, u_long *, ncookies * sizeof(u_long), M_TEMP,
                M_WAITOK);
            for (dp = dpStart, cookiep = cookies;
                 dp < dpEnd;
                 dp = (struct dirent *)((caddr_t) dp + dp->d_reclen)) {
                  off += dp->d_reclen;
                  *cookiep++ = (u_long) off;
            }
            *ap->a_ncookies = ncookies;
            *ap->a_cookies = cookies;
      }
      uio->uio_resid += lost;
      if (ap->a_eofflag)
          *ap->a_eofflag = VTOI(ap->a_vp)->i_size <= uio->uio_offset;
      return (error);
}

/*
 * Return target name of a symbolic link
 */
static int
ufs_readlink(ap)
      struct vop_readlink_args /* {
            struct vnode *a_vp;
            struct uio *a_uio;
            struct ucred *a_cred;
      } */ *ap;
{
      struct vnode *vp = ap->a_vp;
      struct inode *ip = VTOI(vp);
      doff_t isize;

      isize = ip->i_size;
      if ((isize < vp->v_mount->mnt_maxsymlinklen) ||
          DIP(ip, i_blocks) == 0) { /* XXX - for old fastlink support */
            return (uiomove(SHORTLINK(ip), isize, ap->a_uio));
      }
      return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
}

/*
 * Calculate the logical to physical mapping if not done already,
 * then call the device strategy routine.
 *
 * In order to be able to swap to a file, the ufs_bmaparray() operation may not
 * deadlock on memory.  See ufs_bmap() for details.
 */
static int
ufs_strategy(ap)
      struct vop_strategy_args /* {
            struct vnode *a_vp;
            struct buf *a_bp;
      } */ *ap;
{
      struct buf *bp = ap->a_bp;
      struct vnode *vp = ap->a_vp;
      struct bufobj *bo;
      struct inode *ip;
      ufs2_daddr_t blkno;
      int error;

      ip = VTOI(vp);
      if (bp->b_blkno == bp->b_lblkno) {
            error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, bp, NULL, NULL);
            bp->b_blkno = blkno;
            if (error) {
                  bp->b_error = error;
                  bp->b_ioflags |= BIO_ERROR;
                  bufdone(bp);
                  return (error);
            }
            if ((long)bp->b_blkno == -1)
                  vfs_bio_clrbuf(bp);
      }
      if ((long)bp->b_blkno == -1) {
            bufdone(bp);
            return (0);
      }
      bp->b_iooffset = dbtob(bp->b_blkno);
      bo = ip->i_umbufobj;
      BO_STRATEGY(bo, bp);
      return (0);
}

/*
 * Print out the contents of an inode.
 */
static int
ufs_print(ap)
      struct vop_print_args /* {
            struct vnode *a_vp;
      } */ *ap;
{
      struct vnode *vp = ap->a_vp;
      struct inode *ip = VTOI(vp);

      printf("\tino %lu, on dev %s", (u_long)ip->i_number,
          devtoname(ip->i_dev));
      if (vp->v_type == VFIFO)
            fifo_printinfo(vp);
      printf("\n");
      return (0);
}

/*
 * Close wrapper for fifos.
 *
 * Update the times on the inode then do device close.
 */
static int
ufsfifo_close(ap)
      struct vop_close_args /* {
            struct vnode *a_vp;
            int  a_fflag;
            struct ucred *a_cred;
            struct thread *a_td;
      } */ *ap;
{
      struct vnode *vp = ap->a_vp;
      int usecount;

      VI_LOCK(vp);
      usecount = vp->v_usecount;
      if (usecount > 1)
            ufs_itimes_locked(vp);
      VI_UNLOCK(vp);
      return (fifo_specops.vop_close(ap));
}

/*
 * Kqfilter wrapper for fifos.
 *
 * Fall through to ufs kqfilter routines if needed 
 */
static int
ufsfifo_kqfilter(ap)
      struct vop_kqfilter_args *ap;
{
      int error;

      error = fifo_specops.vop_kqfilter(ap);
      if (error)
            error = vfs_kqfilter(ap);
      return (error);
}

/*
 * Return POSIX pathconf information applicable to ufs filesystems.
 */
static int
ufs_pathconf(ap)
      struct vop_pathconf_args /* {
            struct vnode *a_vp;
            int a_name;
            int *a_retval;
      } */ *ap;
{
      int error;

      error = 0;
      switch (ap->a_name) {
      case _PC_LINK_MAX:
            *ap->a_retval = LINK_MAX;
            break;
      case _PC_NAME_MAX:
            *ap->a_retval = NAME_MAX;
            break;
      case _PC_PATH_MAX:
            *ap->a_retval = PATH_MAX;
            break;
      case _PC_PIPE_BUF:
            *ap->a_retval = PIPE_BUF;
            break;
      case _PC_CHOWN_RESTRICTED:
            *ap->a_retval = 1;
            break;
      case _PC_NO_TRUNC:
            *ap->a_retval = 1;
            break;
      case _PC_ACL_EXTENDED:
#ifdef UFS_ACL
            if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
                  *ap->a_retval = 1;
            else
                  *ap->a_retval = 0;
#else
            *ap->a_retval = 0;
#endif
            break;
      case _PC_ACL_PATH_MAX:
#ifdef UFS_ACL
            if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
                  *ap->a_retval = ACL_MAX_ENTRIES;
            else
                  *ap->a_retval = 3;
#else
            *ap->a_retval = 3;
#endif
            break;
      case _PC_MAC_PRESENT:
#ifdef MAC
            if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL)
                  *ap->a_retval = 1;
            else
                  *ap->a_retval = 0;
#else
            *ap->a_retval = 0;
#endif
            break;
      case _PC_ASYNC_IO:
            /* _PC_ASYNC_IO should have been handled by upper layers. */
            KASSERT(0, ("_PC_ASYNC_IO should not get here"));
            error = EINVAL;
            break;
      case _PC_PRIO_IO:
            *ap->a_retval = 0;
            break;
      case _PC_SYNC_IO:
            *ap->a_retval = 0;
            break;
      case _PC_ALLOC_SIZE_MIN:
            *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
            break;
      case _PC_FILESIZEBITS:
            *ap->a_retval = 64;
            break;
      case _PC_REC_INCR_XFER_SIZE:
            *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
            break;
      case _PC_REC_MAX_XFER_SIZE:
            *ap->a_retval = -1; /* means ``unlimited'' */
            break;
      case _PC_REC_MIN_XFER_SIZE:
            *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
            break;
      case _PC_REC_XFER_ALIGN:
            *ap->a_retval = PAGE_SIZE;
            break;
      case _PC_SYMLINK_MAX:
            *ap->a_retval = MAXPATHLEN;
            break;

      default:
            error = EINVAL;
            break;
      }
      return (error);
}

/*
 * Advisory record locking support
 */
static int
ufs_advlock(ap)
      struct vop_advlock_args /* {
            struct vnode *a_vp;
            caddr_t  a_id;
            int  a_op;
            struct flock *a_fl;
            int  a_flags;
      } */ *ap;
{
      struct inode *ip = VTOI(ap->a_vp);

      return (lf_advlock(ap, &(ip->i_lockf), ip->i_size));
}

/*
 * Initialize the vnode associated with a new inode, handle aliased
 * vnodes.
 */
int
ufs_vinit(mntp, fifoops, vpp)
      struct mount *mntp;
      struct vop_vector *fifoops;
      struct vnode **vpp;
{
      struct inode *ip;
      struct vnode *vp;

      vp = *vpp;
      ip = VTOI(vp);
      vp->v_type = IFTOVT(ip->i_mode);
      if (vp->v_type == VFIFO)
            vp->v_op = fifoops;
      ASSERT_VOP_LOCKED(vp, "ufs_vinit");
      if (ip->i_number == ROOTINO)
            vp->v_vflag |= VV_ROOT;
      ip->i_modrev = init_va_filerev();
      *vpp = vp;
      return (0);
}

/*
 * Allocate a new inode.
 * Vnode dvp must be locked.
 */
static int
ufs_makeinode(mode, dvp, vpp, cnp)
      int mode;
      struct vnode *dvp;
      struct vnode **vpp;
      struct componentname *cnp;
{
      struct inode *ip, *pdir;
      struct direct newdir;
      struct vnode *tvp;
#ifdef UFS_ACL
      struct acl *acl;
#endif
      int error;

      pdir = VTOI(dvp);
#ifdef DIAGNOSTIC
      if ((cnp->cn_flags & HASBUF) == 0)
            panic("ufs_makeinode: no name");
#endif
      *vpp = NULL;
      if ((mode & IFMT) == 0)
            mode |= IFREG;

      error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp);
      if (error)
            return (error);
      ip = VTOI(tvp);
      ip->i_gid = pdir->i_gid;
      DIP_SET(ip, i_gid, pdir->i_gid);
#ifdef SUIDDIR
      {
#ifdef QUOTA
            struct ucred ucred, *ucp;
            ucp = cnp->cn_cred;
#endif
            /*
             * If we are not the owner of the directory,
             * and we are hacking owners here, (only do this where told to)
             * and we are not giving it TO root, (would subvert quotas)
             * then go ahead and give it to the other user.
             * Note that this drops off the execute bits for security.
             */
            if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
                (pdir->i_mode & ISUID) &&
                (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
                  ip->i_uid = pdir->i_uid;
                  DIP_SET(ip, i_uid, ip->i_uid);
                  mode &= ~07111;
#ifdef QUOTA
                  /*
                   * Make sure the correct user gets charged
                   * for the space.
                   * Quickly knock up a dummy credential for the victim.
                   * XXX This seems to never be accessed out of our
                   * context so a stack variable is ok.
                   */
                  refcount_init(&ucred.cr_ref, 1);
                  ucred.cr_uid = ip->i_uid;
                  ucred.cr_ngroups = 1;
                  ucred.cr_groups[0] = pdir->i_gid;
                  ucp = &ucred;
#endif
            } else {
                  ip->i_uid = cnp->cn_cred->cr_uid;
                  DIP_SET(ip, i_uid, ip->i_uid);
            }

#ifdef QUOTA
            if ((error = getinoquota(ip)) ||
                (error = chkiq(ip, 1, ucp, 0))) {
                  UFS_VFREE(tvp, ip->i_number, mode);
                  vput(tvp);
                  return (error);
            }
#endif
      }
#else /* !SUIDDIR */
      ip->i_uid = cnp->cn_cred->cr_uid;
      DIP_SET(ip, i_uid, ip->i_uid);
#ifdef QUOTA
      if ((error = getinoquota(ip)) ||
          (error = chkiq(ip, 1, cnp->cn_cred, 0))) {
            UFS_VFREE(tvp, ip->i_number, mode);
            vput(tvp);
            return (error);
      }
#endif
#endif      /* !SUIDDIR */
      ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
#ifdef UFS_ACL
      acl = NULL;
      if ((dvp->v_mount->mnt_flag & MNT_ACLS) != 0) {
            acl = uma_zalloc(acl_zone, M_WAITOK);

            /*
             * Retrieve default ACL for parent, if any.
             */
            error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cnp->cn_cred,
                cnp->cn_thread);
            switch (error) {
            case 0:
                  /*
                   * Retrieved a default ACL, so merge mode and ACL if
                   * necessary.
                   */
                  if (acl->acl_cnt != 0) {
                        /*
                         * Two possible ways for default ACL to not
                         * be present.  First, the EA can be
                         * undefined, or second, the default ACL can
                         * be blank.  If it's blank, fall through to
                         * the it's not defined case.
                         */
                        mode = acl_posix1e_newfilemode(mode, acl);
                        ip->i_mode = mode;
                        DIP_SET(ip, i_mode, mode);
                        ufs_sync_acl_from_inode(ip, acl);
                        break;
                  }
                  /* FALLTHROUGH */
      
            case EOPNOTSUPP:
                  /*
                   * Just use the mode as-is.
                   */
                  ip->i_mode = mode;
                  DIP_SET(ip, i_mode, mode);
                  uma_zfree(acl_zone, acl);
                  acl = NULL;
                  break;
      
            default:
                  UFS_VFREE(tvp, ip->i_number, mode);
                  vput(tvp);
                  uma_zfree(acl_zone, acl);
                  acl = NULL;
                  return (error);
            }
      } else {
#endif
            ip->i_mode = mode;
            DIP_SET(ip, i_mode, mode);
#ifdef UFS_ACL
      }
#endif
      tvp->v_type = IFTOVT(mode);   /* Rest init'd in getnewvnode(). */
      ip->i_effnlink = 1;
      ip->i_nlink = 1;
      DIP_SET(ip, i_nlink, 1);
      if (DOINGSOFTDEP(tvp))
            softdep_change_linkcnt(ip);
      if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
          priv_check_cred(cnp->cn_cred, PRIV_VFS_SETGID, 0)) {
            ip->i_mode &= ~ISGID;
            DIP_SET(ip, i_mode, ip->i_mode);
      }

      if (cnp->cn_flags & ISWHITEOUT) {
            ip->i_flags |= UF_OPAQUE;
            DIP_SET(ip, i_flags, ip->i_flags);
      }

      /*
       * Make sure inode goes to disk before directory entry.
       */
      error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp)));
      if (error)
            goto bad;
#ifdef MAC
      if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) {
            error = mac_create_vnode_extattr(cnp->cn_cred, dvp->v_mount,
                dvp, tvp, cnp);
            if (error)
                  goto bad;
      }
#endif
#ifdef UFS_ACL
      if (acl != NULL) {
            /*
             * XXX: If we abort now, will Soft Updates notify the extattr
             * code that the EAs for the file need to be released?
             */
            error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cnp->cn_cred,
                cnp->cn_thread);
            switch (error) {
            case 0:
                  break;

            case EOPNOTSUPP:
                  /*
                   * XXX: This should not happen, as EOPNOTSUPP above was
                   * supposed to free acl.
                   */
                  printf("ufs_makeinode: VOP_GETACL() but no "
                      "VOP_SETACL()\n");
                  /* panic("ufs_makeinode: VOP_GETACL() but no "
                      "VOP_SETACL()"); */
                  break;

            default:
                  uma_zfree(acl_zone, acl);
                  goto bad;
            }
            uma_zfree(acl_zone, acl);
      }
#endif /* !UFS_ACL */
      ufs_makedirentry(ip, cnp, &newdir);
      error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL);
      if (error)
            goto bad;
      *vpp = tvp;
      return (0);

bad:
      /*
       * Write error occurred trying to update the inode
       * or the directory so must deallocate the inode.
       */
      ip->i_effnlink = 0;
      ip->i_nlink = 0;
      DIP_SET(ip, i_nlink, 0);
      ip->i_flag |= IN_CHANGE;
      if (DOINGSOFTDEP(tvp))
            softdep_change_linkcnt(ip);
      vput(tvp);
      return (error);
}

/* Global vfs data structures for ufs. */
struct vop_vector ufs_vnodeops = {
      .vop_default =          &default_vnodeops,
      .vop_fsync =            VOP_PANIC,
      .vop_read =       VOP_PANIC,
      .vop_reallocblks =      VOP_PANIC,
      .vop_write =            VOP_PANIC,
      .vop_access =           ufs_access,
      .vop_advlock =          ufs_advlock,
      .vop_bmap =       ufs_bmap,
      .vop_cachedlookup =     ufs_lookup,
      .vop_close =            ufs_close,
      .vop_create =           ufs_create,
      .vop_getattr =          ufs_getattr,
      .vop_inactive =         ufs_inactive,
      .vop_link =       ufs_link,
      .vop_lookup =           vfs_cache_lookup,
      .vop_mkdir =            ufs_mkdir,
      .vop_mknod =            ufs_mknod,
      .vop_open =       ufs_open,
      .vop_pathconf =         ufs_pathconf,
      .vop_poll =       vop_stdpoll,
      .vop_print =            ufs_print,
      .vop_readdir =          ufs_readdir,
      .vop_readlink =         ufs_readlink,
      .vop_reclaim =          ufs_reclaim,
      .vop_remove =           ufs_remove,
      .vop_rename =           ufs_rename,
      .vop_rmdir =            ufs_rmdir,
      .vop_setattr =          ufs_setattr,
#ifdef MAC
      .vop_setlabel =         vop_stdsetlabel_ea,
#endif
      .vop_strategy =         ufs_strategy,
      .vop_symlink =          ufs_symlink,
      .vop_whiteout =         ufs_whiteout,
#ifdef UFS_EXTATTR
      .vop_getextattr = ufs_getextattr,
      .vop_deleteextattr =    ufs_deleteextattr,
      .vop_setextattr = ufs_setextattr,
#endif
#ifdef UFS_ACL
      .vop_getacl =           ufs_getacl,
      .vop_setacl =           ufs_setacl,
      .vop_aclcheck =         ufs_aclcheck,
#endif
};

struct vop_vector ufs_fifoops = {
      .vop_default =          &fifo_specops,
      .vop_fsync =            VOP_PANIC,
      .vop_access =           ufs_access,
      .vop_close =            ufsfifo_close,
      .vop_getattr =          ufs_getattr,
      .vop_inactive =         ufs_inactive,
      .vop_kqfilter =         ufsfifo_kqfilter,
      .vop_print =            ufs_print,
      .vop_read =       VOP_PANIC,
      .vop_reclaim =          ufs_reclaim,
      .vop_setattr =          ufs_setattr,
#ifdef MAC
      .vop_setlabel =         vop_stdsetlabel_ea,
#endif
      .vop_write =            VOP_PANIC,
#ifdef UFS_EXTATTR
      .vop_getextattr = ufs_getextattr,
      .vop_deleteextattr =    ufs_deleteextattr,
      .vop_setextattr = ufs_setextattr,
#endif
#ifdef UFS_ACL
      .vop_getacl =           ufs_getacl,
      .vop_setacl =           ufs_setacl,
      .vop_aclcheck =         ufs_aclcheck,
#endif
};

Generated by  Doxygen 1.6.0   Back to index