FreeBSD/Linux Kernel Cross Reference
sys/ufs/ufs/ufs_vnops.c

     /*-
      * SPDX-License-Identifier: BSD-3-Clause
      *
      * 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.
     * 3. 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("$FreeBSD$");
    
    #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/filio.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/smr.h>
    
    #include <security/audit/audit.h>
    #include <security/mac/mac_framework.h>
    
    #include <sys/file.h>           /* XXX */
    
    #include <vm/vm.h>
    #include <vm/vm_extern.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>
    FEATURE(ufs_gjournal, "Journaling support through GEOM for UFS");
    #endif
    
    #ifdef QUOTA
    FEATURE(ufs_quota, "UFS disk quotas support");
    FEATURE(ufs_quota64, "64bit UFS disk quotas support");
    #endif
    
    #ifdef SUIDDIR
    FEATURE(suiddir,
        "Give all new files in directory the same ownership as the directory");
    #endif
   
   VFS_SMR_DECLARE;
   
   #include <ufs/ffs/ffs_extern.h>
   
   static vop_accessx_t    ufs_accessx;
   static vop_fplookup_vexec_t ufs_fplookup_vexec;
   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_stat_t       ufs_stat;
   static vop_getattr_t    ufs_getattr;
   static vop_ioctl_t      ufs_ioctl;
   static vop_link_t       ufs_link;
   static int ufs_makeinode(int mode, struct vnode *, struct vnode **,
       struct componentname *, const char *);
   static vop_mmapped_t    ufs_mmapped;
   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;
   
   SYSCTL_NODE(_vfs, OID_AUTO, ufs, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
       "UFS filesystem");
   
   /*
    * 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 (UFS_RDONLY(ip))
                   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))
                   UFS_INODE_SET_FLAG(ip, IN_LAZYMOD);
           else if (((vp->v_mount->mnt_kern_flag &
                       (MNTK_SUSPENDED | MNTK_SUSPEND)) == 0) ||
                       (ip->i_flag & (IN_CHANGE | IN_UPDATE)))
                   UFS_INODE_SET_FLAG(ip, IN_MODIFIED);
           else if (ip->i_flag & IN_ACCESS)
                   UFS_INODE_SET_FLAG(ip, 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);
           }
           if (ip->i_flag & IN_CHANGE) {
                   DIP_SET(ip, i_ctime, ts.tv_sec);
                   DIP_SET(ip, i_ctimensec, ts.tv_nsec);
                   DIP_SET(ip, i_modrev, DIP(ip, i_modrev) + 1);
           }
   
    out:
           ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
   }
   
   void
   ufs_itimes(struct vnode *vp)
   {
           struct inode *ip;
   
           ip = VTOI(vp);
           if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
                   return;
   
           VI_LOCK(vp);
           ufs_itimes_locked(vp);
           VI_UNLOCK(vp);
   }
   
   static int
   ufs_sync_nlink1(struct mount *mp)
   {
           int error;
   
           error = vfs_busy(mp, 0);
           if (error == 0) {
                   VFS_SYNC(mp, MNT_WAIT);
                   vfs_unbusy(mp);
                   error = ERELOOKUP;
           }
           vfs_rel(mp);
           return (error);
   }
   
   static int
   ufs_sync_nlink(struct vnode *vp, struct vnode *vp1)
   {
           struct inode *ip;
           struct mount *mp;
           int error;
   
           ip = VTOI(vp);
           if (ip->i_nlink < UFS_LINK_MAX)
                   return (0);
           if (!DOINGSOFTDEP(vp) || ip->i_effnlink >= UFS_LINK_MAX)
                   return (EMLINK);
   
           mp = vp->v_mount;
           vfs_ref(mp);
           VOP_UNLOCK(vp);
           if (vp1 != NULL)
                   VOP_UNLOCK(vp1);
           error = ufs_sync_nlink1(mp);
           vn_lock_pair(vp, false, vp1, false);
           return (error);
   }
   
   /*
    * Create a regular file
    */
   static int
   ufs_create(
           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, "ufs_create");
           if (error != 0)
                   return (error);
           if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
                   cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
           return (0);
   }
   
   /*
    * Mknod vnode call
    */
   /* ARGSUSED */
   static int
   ufs_mknod(
           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, "ufs_mknod");
           if (error)
                   return (error);
           ip = VTOI(*vpp);
           UFS_INODE_SET_FLAG(ip, 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().  This is
            * needed to do further inode initialization, for instance
            * fifo, which was too early for VFS_VGET() done as part of
            * UFS_VALLOC().
            */
           (*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);
           vnode_create_vobject(vp, DIP(ip, i_size), ap->a_td);
           if (vp->v_type == VREG && (vn_irflag_read(vp) & VIRF_PGREAD) == 0 &&
               ip->i_ump->um_bsize >= PAGE_SIZE) {
                   vn_irflag_set_cond(vp, VIRF_PGREAD);
           }
   
           /*
            * Files marked append-only must be opened for appending.
            */
           if ((ip->i_flags & APPEND) &&
               (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
                   return (EPERM);
   
           return (0);
   }
   
   /*
    * Close called.
    *
    * Update the times on the inode.
    */
   /* ARGSUSED */
   static int
   ufs_close(
           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;
   
           ufs_itimes(vp);
           return (0);
   }
   
   static int
   ufs_accessx(
           struct vop_accessx_args /* {
                   struct vnode *a_vp;
                   accmode_t a_accmode;
                   struct ucred *a_cred;
                   struct thread *a_td;
           } */ *ap)
   {
           struct vnode *vp = ap->a_vp;
           struct inode *ip = VTOI(vp);
           accmode_t accmode = ap->a_accmode;
           int error;
   #ifdef UFS_ACL
           struct acl *acl;
           acl_type_t type;
   #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 (accmode & VMODIFY_PERMS) {
                   switch (vp->v_type) {
                   case VDIR:
                   case VLNK:
                   case VREG:
                           if (vp->v_mount->mnt_flag & MNT_RDONLY)
                                   return (EROFS);
   #ifdef QUOTA
                           /*
                            * Inode is accounted in the quotas only if struct
                            * dquot is attached to it. VOP_ACCESS() is called
                            * from vn_open_cred() and provides a convenient
                            * point to call getinoquota().  The lock mode is
                            * exclusive when the file is opening for write.
                            */
                           if (VOP_ISLOCKED(vp) == LK_EXCLUSIVE) {
                                   error = getinoquota(ip);
                                   if (error != 0)
                                           return (error);
                           }
   #endif
                           break;
                   default:
                           break;
                   }
           }
   
           /*
            * If immutable bit set, nobody gets to write it.  "& ~VADMIN_PERMS"
            * permits the owner of the file to remove the IMMUTABLE flag.
            */
           if ((accmode & (VMODIFY_PERMS & ~VADMIN_PERMS)) &&
               (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
                   return (EPERM);
   
   #ifdef UFS_ACL
           if ((vp->v_mount->mnt_flag & (MNT_ACLS | MNT_NFS4ACLS)) != 0) {
                   if (vp->v_mount->mnt_flag & MNT_NFS4ACLS)
                           type = ACL_TYPE_NFS4;
                   else
                           type = ACL_TYPE_ACCESS;
   
                   acl = acl_alloc(M_WAITOK);
                   if (type == ACL_TYPE_NFS4)
                           error = ufs_getacl_nfs4_internal(vp, acl, ap->a_td);
                   else
                           error = VOP_GETACL(vp, type, acl, ap->a_cred, ap->a_td);
                   switch (error) {
                   case 0:
                           if (type == ACL_TYPE_NFS4) {
                                   error = vaccess_acl_nfs4(vp->v_type, ip->i_uid,
                                       ip->i_gid, acl, accmode, ap->a_cred);
                           } else {
                                   error = vfs_unixify_accmode(&accmode);
                                   if (error == 0)
                                           error = vaccess_acl_posix1e(vp->v_type, ip->i_uid,
                                               ip->i_gid, acl, accmode, ap->a_cred);
                           }
                           break;
                   default:
                           if (error != EOPNOTSUPP)
                                   printf(
   "ufs_accessx(): 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 = vfs_unixify_accmode(&accmode);
                           if (error == 0)
                                   error = vaccess(vp->v_type, ip->i_mode,
                                       ip->i_uid, ip->i_gid, accmode, ap->a_cred);
                   }
                   acl_free(acl);
   
                   return (error);
           }
   #endif /* !UFS_ACL */
           error = vfs_unixify_accmode(&accmode);
           if (error == 0)
                   error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
                       accmode, ap->a_cred);
           return (error);
   }
   
   /*
    * VOP_FPLOOKUP_VEXEC routines are subject to special circumstances, see
    * the comment above cache_fplookup for details.
    */
   static int
   ufs_fplookup_vexec(
           struct vop_fplookup_vexec_args /* {
                   struct vnode *a_vp;
                   struct ucred *a_cred;
                   struct thread *a_td;
           } */ *ap)
   {
           struct vnode *vp;
           struct inode *ip;
           struct ucred *cred;
           mode_t all_x, mode;
   
           vp = ap->a_vp;
           ip = VTOI_SMR(vp);
           if (__predict_false(ip == NULL))
                   return (EAGAIN);
   
           /*
            * XXX ACL race
            *
            * ACLs are not supported and UFS clears/sets this flag on mount and
            * remount. However, we may still be racing with seeing them and there
            * is no provision to make sure they were accounted for. This matches
            * the behavior of the locked case, since the lookup there is also
            * racy: mount takes no measures to block anyone from progressing.
            */
           all_x = S_IXUSR | S_IXGRP | S_IXOTH;
           mode = atomic_load_short(&ip->i_mode);
           if (__predict_true((mode & all_x) == all_x))
                   return (0);
   
           cred = ap->a_cred;
           return (vaccess_vexec_smr(mode, ip->i_uid, ip->i_gid, cred));
   }
   
   /* ARGSUSED */
   static int
   ufs_stat(struct vop_stat_args *ap)
   {
           struct vnode *vp = ap->a_vp;
           struct inode *ip = VTOI(vp);
           struct stat *sb = ap->a_sb;
           int error;
   
           error = vop_stat_helper_pre(ap);
           if (__predict_false(error))
                   return (error);
   
           VI_LOCK(vp);
           ufs_itimes_locked(vp);
           if (I_IS_UFS1(ip)) {
                   sb->st_atim.tv_sec = ip->i_din1->di_atime;
                   sb->st_atim.tv_nsec = ip->i_din1->di_atimensec;
           } else {
                   sb->st_atim.tv_sec = ip->i_din2->di_atime;
                   sb->st_atim.tv_nsec = ip->i_din2->di_atimensec;
           }
           VI_UNLOCK(vp);
   
           sb->st_dev = dev2udev(ITOUMP(ip)->um_dev);
           sb->st_ino = ip->i_number;
           sb->st_mode = (ip->i_mode & ~IFMT) | VTTOIF(vp->v_type);
           sb->st_nlink = ip->i_effnlink;
           sb->st_uid = ip->i_uid;
           sb->st_gid = ip->i_gid;
           if (I_IS_UFS1(ip)) {
                   sb->st_rdev = ip->i_din1->di_rdev;
                   sb->st_size = ip->i_din1->di_size;
                   sb->st_mtim.tv_sec = ip->i_din1->di_mtime;
                   sb->st_mtim.tv_nsec = ip->i_din1->di_mtimensec;
                   sb->st_ctim.tv_sec = ip->i_din1->di_ctime;
                   sb->st_ctim.tv_nsec = ip->i_din1->di_ctimensec;
                   sb->st_birthtim.tv_sec = -1;
                   sb->st_birthtim.tv_nsec = 0;
                   sb->st_blocks = dbtob((u_quad_t)ip->i_din1->di_blocks) / S_BLKSIZE;
           } else {
                   sb->st_rdev = ip->i_din2->di_rdev;
                   sb->st_size = ip->i_din2->di_size;
                   sb->st_mtim.tv_sec = ip->i_din2->di_mtime;
                   sb->st_mtim.tv_nsec = ip->i_din2->di_mtimensec;
                   sb->st_ctim.tv_sec = ip->i_din2->di_ctime;
                   sb->st_ctim.tv_nsec = ip->i_din2->di_ctimensec;
                   sb->st_birthtim.tv_sec = ip->i_din2->di_birthtime;
                   sb->st_birthtim.tv_nsec = ip->i_din2->di_birthnsec;
                   sb->st_blocks = dbtob((u_quad_t)ip->i_din2->di_blocks) / S_BLKSIZE;
           }
   
           sb->st_blksize = max(PAGE_SIZE, vp->v_mount->mnt_stat.f_iosize);
           sb->st_flags = ip->i_flags;
           sb->st_gen = ip->i_gen;
   
           return (vop_stat_helper_post(ap, error));
   }
   
   /* ARGSUSED */
   static int
   ufs_getattr(
           struct vop_getattr_args /* {
                   struct vnode *a_vp;
                   struct vattr *a_vap;
                   struct ucred *a_cred;
           } */ *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 (I_IS_UFS1(ip)) {
                   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(ITOUMP(ip)->um_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 (I_IS_UFS1(ip)) {
                   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_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks);
                   vap->va_filerev = ip->i_din1->di_modrev;
           } 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_filerev = ip->i_din2->di_modrev;
           }
           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);
           return (0);
   }
   
   /*
    * Set attribute vnode op. called from several syscalls
    */
   static int
   ufs_setattr(
           struct vop_setattr_args /* {
                   struct vnode *a_vp;
                   struct vattr *a_vap;
                   struct ucred *a_cred;
           } */ *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 = curthread;
           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);
           }
           if (vap->va_flags != VNOVAL) {
                   if ((vap->va_flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE |
                       SF_NOUNLINK | SF_SNAPSHOT | UF_APPEND | UF_ARCHIVE |
                       UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP | UF_NOUNLINK |
                       UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE |
                       UF_SPARSE | UF_SYSTEM)) != 0)
                           return (EOPNOTSUPP);
                   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 PR_ALLOW_CHFLAGS permission bit is set;
                    * otherwise, they behave like unprivileged processes.
                    */
                   if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) {
                           if (ip->i_flags &
                               (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
                                   error = securelevel_gt(cred, 0);
                                   if (error)
                                           return (error);
                           }
                           /* The snapshot flag cannot be toggled. */
                           if ((vap->va_flags ^ ip->i_flags) & SF_SNAPSHOT)
                                   return (EPERM);
                   } else {
                           if (ip->i_flags &
                               (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
                               ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
                                   return (EPERM);
                   }
                   ip->i_flags = vap->va_flags;
                   DIP_SET(ip, i_flags, vap->va_flags);
                   UFS_INODE_SET_FLAG(ip, IN_CHANGE);
                   error = UFS_UPDATE(vp, 0);
                   if (ip->i_flags & (IMMUTABLE | APPEND))
                           return (error);
           }
           /*
            * If immutable or append, no one can change any of its attributes
            * except the ones already handled (in some cases, file flags
            * including the immutability flags themselves for the superuser).
            */
           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 (IS_SNAPSHOT(ip))
                                   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);
                   }
                   error = vn_rlimit_trunc(vap->va_size, td);
                   if (error != 0)
                           return (error);
                   if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL |
                       ((vap->va_vaflags & VA_SYNC) != 0 ? IO_SYNC : 0),
                       cred)) != 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 (IS_SNAPSHOT(ip))
                           return (EPERM);
                   error = vn_utimes_perm(vp, vap, cred, td);
                   if (error != 0)
                           return (error);
                   UFS_INODE_SET_FLAG(ip, IN_CHANGE | IN_MODIFIED);
                   if (vap->va_atime.tv_sec != VNOVAL) {
                           ip->i_flag &= ~IN_ACCESS;
                           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) {
                           ip->i_flag &= ~IN_UPDATE;
                           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 && I_IS_UFS2(ip)) {
                           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 (IS_SNAPSHOT(ip) && (vap->va_mode & (S_IXUSR | S_IWUSR |
                       S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH)) != 0)
                           return (EPERM);
                   error = ufs_chmod(vp, (int)vap->va_mode, cred, td);
           }
           return (error);
   }
   
   #ifdef UFS_ACL
   static int
   ufs_update_nfs4_acl_after_mode_change(struct vnode *vp, int mode,
       int file_owner_id, struct ucred *cred, struct thread *td)
   {
           int error;
           struct acl *aclp;
   
           aclp = acl_alloc(M_WAITOK);
           error = ufs_getacl_nfs4_internal(vp, aclp, td);
           /*
            * We don't have to handle EOPNOTSUPP here, as the filesystem claims
            * it supports ACLs.
            */
           if (error)
                   goto out;
   
           acl_nfs4_sync_acl_from_mode(aclp, mode, file_owner_id);
           error = ufs_setacl_nfs4_internal(vp, aclp, td);
   
   out:
           acl_free(aclp);
           return (error);
   }
   #endif /* UFS_ACL */
   
   static int
   ufs_mmapped(
           struct vop_mmapped_args /* {
                   struct vnode *a_vp;
           } */ *ap)
   {
           struct vnode *vp;
           struct inode *ip;
           struct mount *mp;
   
           vp = ap->a_vp;
           ip = VTOI(vp);
           mp = vp->v_mount;
   
           if ((mp->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
                   UFS_INODE_SET_FLAG_SHARED(ip, IN_ACCESS);
           /*
            * XXXKIB No UFS_UPDATE(ap->a_vp, 0) there.
            */
           return (0);
   }
   
   /*
    * Change the mode on a file.
    * Inode must be locked before calling.
    */
   static int
   ufs_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
   {
           struct inode *ip = VTOI(vp);
           int newmode, error;
   
           /*
            * To modify the permissions on a file, must possess VADMIN
            * for that file.
            */
           if ((error = VOP_ACCESSX(vp, VWRITE_ACL, 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))
                           return (EFTYPE);
           }
           if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
                   error = priv_check_cred(cred, PRIV_VFS_SETGID);
                   if (error)
                           return (error);
           }
   
           /*
            * Deny setting setuid if we are not the file owner.
            */
           if ((mode & ISUID) && ip->i_uid != cred->cr_uid) {
                   error = priv_check_cred(cred, PRIV_VFS_ADMIN);
                   if (error)
                           return (error);
           }
   
           newmode = ip->i_mode & ~ALLPERMS;
           newmode |= (mode & ALLPERMS);
           UFS_INODE_SET_MODE(ip, newmode);
           DIP_SET(ip, i_mode, ip->i_mode);
           UFS_INODE_SET_FLAG(ip, IN_CHANGE);
   #ifdef UFS_ACL
           if ((vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0)
                   error = ufs_update_nfs4_acl_after_mode_change(vp, mode, ip->i_uid, cred, td);
   #endif
           if (error == 0 && (ip->i_flag & IN_CHANGE) != 0)
                   error = UFS_UPDATE(vp, 0);
   
           return (error);
   }
   
   /*
    * Perform chown operation on inode ip;
    * inode must be locked prior to call.
    */
   static int
   ufs_chown(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_ACCESSX(vp, VWRITE_OWNER, 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 && uid != cred->cr_uid) || 
               (gid != ip->i_gid && !groupmember(gid, cred))) &&
               (error = priv_check_cred(cred, PRIV_VFS_CHOWN)))
                   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|FORCE);
           (void) chkiq(ip, -1, cred, CHOWN|FORCE);
           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 */
          UFS_INODE_SET_FLAG(ip, IN_CHANGE);
          if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
                  if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID)) {
                          UFS_INODE_SET_MODE(ip, ip->i_mode & ~(ISUID | ISGID));
                          DIP_SET(ip, i_mode, ip->i_mode);
                  }
          }
          error = UFS_UPDATE(vp, 0);
          return (error);
  }
  
  static int
  ufs_remove(
          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))
                  return (EPERM);
          if (DOINGSUJ(dvp)) {
                  error = softdep_prelink(dvp, vp, ap->a_cnp);
                  if (error != 0) {
                          MPASS(error == ERELOOKUP);
                          return (error);
                  }
          }
  
  #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 (IS_SNAPSHOT(ip)) {
                  /*
                   * 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);
                  (void) VOP_FSYNC(dvp, MNT_WAIT, td);
                  vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
          }
          return (error);
  }
  
  static void
  print_bad_link_count(const char *funcname, struct vnode *dvp)
  {
          struct inode *dip;
  
          dip = VTOI(dvp);
          uprintf("%s: Bad link count %d on parent inode %jd in file system %s\n",
              funcname, dip->i_effnlink, (intmax_t)dip->i_number,
              dvp->v_mount->mnt_stat.f_mntonname);
  }
  
  /*
   * link vnode call
   */
  static int
  ufs_link(
          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;
  
          if (DOINGSUJ(tdvp)) {
                  error = softdep_prelink(tdvp, vp, cnp);
                  if (error != 0) {
                          MPASS(error == ERELOOKUP);
                          return (error);
                  }
          }
  
          if (VTOI(tdvp)->i_effnlink < 2) {
                  print_bad_link_count("ufs_link", tdvp);
                  error = EINVAL;
                  goto out;
          }
          error = ufs_sync_nlink(vp, tdvp);
          if (error != 0)
                  goto out;
          ip = VTOI(vp);
  
          /*
           * The file may have been removed after namei dropped the original
           * lock.
           */
          if (ip->i_effnlink == 0) {
                  error = ENOENT;
                  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);
          UFS_INODE_SET_FLAG(ip, IN_CHANGE);
          if (DOINGSOFTDEP(vp))
                  softdep_setup_link(VTOI(tdvp), 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);
                  UFS_INODE_SET_FLAG(ip, IN_CHANGE);
                  if (DOINGSOFTDEP(vp))
                          softdep_revert_link(VTOI(tdvp), ip);
          }
  out:
          return (error);
  }
  
  /*
   * whiteout vnode call
   */
  static int
  ufs_whiteout(
          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;
  
          if (DOINGSUJ(dvp) && (ap->a_flags == CREATE ||
              ap->a_flags == DELETE)) {
                  error = softdep_prelink(dvp, NULL, cnp);
                  if (error != 0) {
                          MPASS(error == ERELOOKUP);
                          return (error);
                  }
          }
  
          switch (ap->a_flags) {
          case LOOKUP:
                  /* 4.4 format directories support whiteout operations */
                  if (!OFSFMT(dvp))
                          return (0);
                  return (EOPNOTSUPP);
  
          case CREATE:
                  /* create a new directory whiteout */
  #ifdef INVARIANTS
                  if (OFSFMT(dvp))
                          panic("ufs_whiteout: old format filesystem");
  #endif
  
                  newdir.d_ino = UFS_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 INVARIANTS
                  if (OFSFMT(dvp))
                          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);
  }
  
  static volatile int rename_restarts;
  SYSCTL_INT(_vfs_ufs, OID_AUTO, rename_restarts, CTLFLAG_RD,
      __DEVOLATILE(int *, &rename_restarts), 0,
      "Times rename had to restart due to lock contention");
  
  /*
   * 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(
          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 vnode *nvp;
          struct componentname *tcnp = ap->a_tcnp;
          struct componentname *fcnp = ap->a_fcnp;
          struct thread *td = curthread;
          struct inode *fip, *tip, *tdp, *fdp;
          struct direct newdir;
          off_t endoff;
          int doingdirectory, newparent;
          int error = 0;
          struct mount *mp;
          ino_t ino;
          seqc_t fdvp_s, fvp_s, tdvp_s, tvp_s;
          bool checkpath_locked, want_seqc_end;
  
          checkpath_locked = want_seqc_end = false;
  
          endoff = 0;
          mp = tdvp->v_mount;
          VOP_UNLOCK(tdvp);
          if (tvp && tvp != tdvp)
                  VOP_UNLOCK(tvp);
          /*
           * Check for cross-device rename.
           */
          if ((fvp->v_mount != tdvp->v_mount) ||
              (tvp && (fvp->v_mount != tvp->v_mount))) {
                  error = EXDEV;
                  mp = NULL;
                  goto releout;
          }
  
          fdvp_s = fvp_s = tdvp_s = tvp_s = SEQC_MOD;
  relock:
          /* 
           * We need to acquire 2 to 4 locks depending on whether tvp is NULL
           * and fdvp and tdvp are the same directory.  Subsequently we need
           * to double-check all paths and in the directory rename case we
           * need to verify that we are not creating a directory loop.  To
           * handle this we acquire all but fdvp using non-blocking
           * acquisitions.  If we fail to acquire any lock in the path we will
           * drop all held locks, acquire the new lock in a blocking fashion,
           * and then release it and restart the rename.  This acquire/release
           * step ensures that we do not spin on a lock waiting for release.
           */
          error = vn_lock(fdvp, LK_EXCLUSIVE);
          if (error)
                  goto releout;
          if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
                  VOP_UNLOCK(fdvp);
                  error = vn_lock(tdvp, LK_EXCLUSIVE);
                  if (error)
                          goto releout;
                  VOP_UNLOCK(tdvp);
                  atomic_add_int(&rename_restarts, 1);
                  goto relock;
          }
          /*
           * Re-resolve fvp to be certain it still exists and fetch the
           * correct vnode.
           */
          error = ufs_lookup_ino(fdvp, NULL, fcnp, &ino);
          if (error) {
                  VOP_UNLOCK(fdvp);
                  VOP_UNLOCK(tdvp);
                  goto releout;
          }
          error = VFS_VGET(mp, ino, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
          if (error) {
                  VOP_UNLOCK(fdvp);
                  VOP_UNLOCK(tdvp);
                  if (error != EBUSY)
                          goto releout;
                  error = VFS_VGET(mp, ino, LK_EXCLUSIVE, &nvp);
                  if (error != 0)
                          goto releout;
                  VOP_UNLOCK(nvp);
                  vrele(fvp);
                  fvp = nvp;
                  atomic_add_int(&rename_restarts, 1);
                  goto relock;
          }
          vrele(fvp);
          fvp = nvp;
          /*
           * Re-resolve tvp and acquire the vnode lock if present.
           */
          error = ufs_lookup_ino(tdvp, NULL, tcnp, &ino);
          if (error != 0 && error != EJUSTRETURN) {
                  VOP_UNLOCK(fdvp);
                  VOP_UNLOCK(tdvp);
                  VOP_UNLOCK(fvp);
                  goto releout;
          }
          /*
           * If tvp disappeared we just carry on.
           */
          if (error == EJUSTRETURN && tvp != NULL) {
                  vrele(tvp);
                  tvp = NULL;
          }
          /*
           * Get the tvp ino if the lookup succeeded.  We may have to restart
           * if the non-blocking acquire fails.
           */
          if (error == 0) {
                  nvp = NULL;
                  error = VFS_VGET(mp, ino, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
                  if (tvp)
                          vrele(tvp);
                  tvp = nvp;
                  if (error) {
                          VOP_UNLOCK(fdvp);
                          VOP_UNLOCK(tdvp);
                          VOP_UNLOCK(fvp);
                          if (error != EBUSY)
                                  goto releout;
                          error = VFS_VGET(mp, ino, LK_EXCLUSIVE, &nvp);
                          if (error != 0)
                                  goto releout;
                          vput(nvp);
                          atomic_add_int(&rename_restarts, 1);
                          goto relock;
                  }
          }
  
          if (DOINGSUJ(fdvp) &&
              (seqc_in_modify(fdvp_s) || !vn_seqc_consistent(fdvp, fdvp_s) ||
               seqc_in_modify(fvp_s) || !vn_seqc_consistent(fvp, fvp_s) ||
               seqc_in_modify(tdvp_s) || !vn_seqc_consistent(tdvp, tdvp_s) ||
               (tvp != NULL && (seqc_in_modify(tvp_s) ||
               !vn_seqc_consistent(tvp, tvp_s))))) {
                  error = softdep_prerename(fdvp, fvp, tdvp, tvp);
                  if (error != 0)
                          goto releout;
          }
  
          fdp = VTOI(fdvp);
          fip = VTOI(fvp);
          tdp = VTOI(tdvp);
          tip = NULL;
          if (tvp)
                  tip = VTOI(tvp);
          if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
              (VTOI(tdvp)->i_flags & APPEND))) {
                  error = EPERM;
                  goto unlockout;
          }
          /*
           * Renaming a file to itself has no effect.  The upper layers should
           * not call us in that case.  However, things could change after
           * we drop the locks above.
           */
          if (fvp == tvp) {
                  error = 0;
                  goto unlockout;
          }
          doingdirectory = 0;
          newparent = 0;
          ino = fip->i_number;
          if (fip->i_nlink >= UFS_LINK_MAX) {
                  if (!DOINGSOFTDEP(fvp) || fip->i_effnlink >= UFS_LINK_MAX) {
                          error = EMLINK;
                          goto unlockout;
                  }
                  vfs_ref(mp);
                  MPASS(!want_seqc_end);
                  if (checkpath_locked) {
                          sx_xunlock(&VFSTOUFS(mp)->um_checkpath_lock);
                          checkpath_locked = false;
                  }
                  VOP_UNLOCK(fdvp);
                  VOP_UNLOCK(fvp);
                  vref(tdvp);
                  if (tvp != NULL)
                          vref(tvp);
                  VOP_VPUT_PAIR(tdvp, &tvp, true);
                  error = ufs_sync_nlink1(mp);
                  vrele(fdvp);
                  vrele(fvp);
                  vrele(tdvp);
                  if (tvp != NULL)
                          vrele(tvp);
                  return (error);
          }
          if ((fip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
              || (fdp->i_flags & APPEND)) {
                  error = EPERM;
                  goto unlockout;
          }
          if ((fip->i_mode & IFMT) == IFDIR) {
                  /*
                   * Avoid ".", "..", and aliases of "." for obvious reasons.
                   */
                  if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
                      fdp == fip ||
                      (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT) {
                          error = EINVAL;
                          goto unlockout;
                  }
                  if (fdp->i_number != tdp->i_number)
                          newparent = tdp->i_number;
                  doingdirectory = 1;
          }
          if ((fvp->v_type == VDIR && fvp->v_mountedhere != NULL) ||
              (tvp != NULL && tvp->v_type == VDIR &&
              tvp->v_mountedhere != NULL)) {
                  error = EXDEV;
                  goto unlockout;
          }
  
          /*
           * 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 "..".
           */
          if (doingdirectory && newparent) {
                  error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, curthread);
                  if (error)
                          goto unlockout;
  
                  sx_xlock(&VFSTOUFS(mp)->um_checkpath_lock);
                  checkpath_locked = true;
                  error = ufs_checkpath(ino, fdp->i_number, tdp, tcnp->cn_cred,
                      &ino);
                  /*
                   * We encountered a lock that we have to wait for.  Unlock
                   * everything else and VGET before restarting.
                   */
                  if (ino) {
                          sx_xunlock(&VFSTOUFS(mp)->um_checkpath_lock);
                          checkpath_locked = false;
                          VOP_UNLOCK(fdvp);
                          VOP_UNLOCK(fvp);
                          VOP_UNLOCK(tdvp);
                          if (tvp)
                                  VOP_UNLOCK(tvp);
                          error = VFS_VGET(mp, ino, LK_SHARED, &nvp);
                          if (error == 0)
                                  vput(nvp);
                          atomic_add_int(&rename_restarts, 1);
                          goto relock;
                  }
                  if (error)
                          goto unlockout;
          }
          if (fip->i_effnlink == 0 || fdp->i_effnlink == 0 ||
              tdp->i_effnlink == 0)
                  panic("Bad effnlink fip %p, fdp %p, tdp %p", fip, fdp, tdp);
  
          if (tvp != NULL)
                  vn_seqc_write_begin(tvp);
          vn_seqc_write_begin(tdvp);
          vn_seqc_write_begin(fvp);
          vn_seqc_write_begin(fdvp);
          want_seqc_end = true;
  
          /*
           * 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.
           */
          fip->i_effnlink++;
          fip->i_nlink++;
          DIP_SET(fip, i_nlink, fip->i_nlink);
          UFS_INODE_SET_FLAG(fip, IN_CHANGE);
          if (DOINGSOFTDEP(fvp))
                  softdep_setup_link(tdp, fip);
          error = UFS_UPDATE(fvp, !DOINGSOFTDEP(fvp) && !DOINGASYNC(fvp));
          if (error)
                  goto bad;
  
          /*
           * 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 (tip == NULL) {
                  if (ITODEV(tdp) != ITODEV(fip))
                          panic("ufs_rename: EXDEV");
                  if (doingdirectory && newparent) {
                          /*
                           * Account for ".." in new directory.
                           * When source and destination have the same
                           * parent we don't adjust the link count.  The
                           * actual link modification is completed when
                           * .. is rewritten below.
                           */
                          if (tdp->i_nlink >= UFS_LINK_MAX) {
                                  fip->i_effnlink--;
                                  fip->i_nlink--;
                                  DIP_SET(fip, i_nlink, fip->i_nlink);
                                  UFS_INODE_SET_FLAG(fip, IN_CHANGE);
                                  if (DOINGSOFTDEP(fvp))
                                          softdep_revert_link(tdp, fip);
                                  if (!DOINGSOFTDEP(tdvp) ||
                                      tdp->i_effnlink >= UFS_LINK_MAX) {
                                          error = EMLINK;
                                          goto unlockout;
                                  }
                                  MPASS(want_seqc_end);
                                  if (tvp != NULL)
                                          vn_seqc_write_end(tvp);
                                  vn_seqc_write_end(tdvp);
                                  vn_seqc_write_end(fvp);
                                  vn_seqc_write_end(fdvp);
                                  want_seqc_end = false;
                                  vfs_ref(mp);
                                  MPASS(checkpath_locked);
                                  sx_xunlock(&VFSTOUFS(mp)->um_checkpath_lock);
                                  checkpath_locked = false;
                                  VOP_UNLOCK(fdvp);
                                  VOP_UNLOCK(fvp);
                                  vref(tdvp);
                                  if (tvp != NULL)
                                          vref(tvp);
                                  VOP_VPUT_PAIR(tdvp, &tvp, true);
                                  error = ufs_sync_nlink1(mp);
                                  vrele(fdvp);
                                  vrele(fvp);
                                  vrele(tdvp);
                                  if (tvp != NULL)
                                          vrele(tvp);
                                  return (error);
                          }
                  }
                  ufs_makedirentry(fip, tcnp, &newdir);
                  error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL);
                  if (error)
                          goto bad;
                  /* Setup tdvp for directory compaction if needed. */
                  if (I_COUNT(tdp) != 0 && I_ENDOFF(tdp) != 0 &&
                      I_ENDOFF(tdp) < tdp->i_size)
                          endoff = I_ENDOFF(tdp);
          } else {
                  if (ITODEV(tip) != ITODEV(tdp) || ITODEV(tip) != ITODEV(fip))
                          panic("ufs_rename: EXDEV");
                  /*
                   * Short circuit rename(foo, foo).
                   */
                  if (tip->i_number == fip->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 ((tdp->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 ((tip->i_mode & IFMT) == IFDIR) {
                          if ((tip->i_effnlink > 2) ||
                              !ufs_dirempty(tip, tdp->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;
                  }
                  if (doingdirectory) {
                          if (!newparent) {
                                  tdp->i_effnlink--;
                                  if (DOINGSOFTDEP(tdvp))
                                          softdep_change_linkcnt(tdp);
                          }
                          tip->i_effnlink--;
                          if (DOINGSOFTDEP(tvp))
                                  softdep_change_linkcnt(tip);
                  }
                  error = ufs_dirrewrite(tdp, tip, fip->i_number,
                      IFTODT(fip->i_mode),
                      (doingdirectory && newparent) ? newparent : doingdirectory);
                  if (error) {
                          if (doingdirectory) {
                                  if (!newparent) {
                                          tdp->i_effnlink++;
                                          if (DOINGSOFTDEP(tdvp))
                                                  softdep_change_linkcnt(tdp);
                                  }
                                  tip->i_effnlink++;
                                  if (DOINGSOFTDEP(tvp))
                                          softdep_change_linkcnt(tip);
                          }
                          goto bad;
                  }
                  if (doingdirectory && !DOINGSOFTDEP(tvp)) {
                          /*
                           * 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) {
                                  tdp->i_nlink--;
                                  DIP_SET(tdp, i_nlink, tdp->i_nlink);
                                  UFS_INODE_SET_FLAG(tdp, IN_CHANGE);
                          }
                          tip->i_nlink--;
                          DIP_SET(tip, i_nlink, tip->i_nlink);
                          UFS_INODE_SET_FLAG(tip, IN_CHANGE);
                  }
          }
  
          /*
           * 3) Unlink the source.  We have to resolve the path again to
           * fixup the directory offset and count for ufs_dirremove.
           */
          if (fdvp == tdvp) {
                  error = ufs_lookup_ino(fdvp, NULL, fcnp, &ino);
                  if (error)
                          panic("ufs_rename: from entry went away!");
                  if (ino != fip->i_number)
                          panic("ufs_rename: ino mismatch %ju != %ju\n",
                              (uintmax_t)ino, (uintmax_t)fip->i_number);
          }
          /*
           * 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) {
                  /*
                   * If tip exists we simply use its link, otherwise we must
                   * add a new one.
                   */
                  if (tip == NULL) {
                          tdp->i_effnlink++;
                          tdp->i_nlink++;
                          DIP_SET(tdp, i_nlink, tdp->i_nlink);
                          UFS_INODE_SET_FLAG(tdp, IN_CHANGE);
                          if (DOINGSOFTDEP(tdvp))
                                  softdep_setup_dotdot_link(tdp, fip);
                          error = UFS_UPDATE(tdvp, !DOINGSOFTDEP(tdvp) &&
                              !DOINGASYNC(tdvp));
                          /* Don't go to bad here as the new link exists. */
                          if (error)
                                  goto unlockout;
                  } else if (DOINGSUJ(tdvp))
                          /* Journal must account for each new link. */
                          softdep_setup_dotdot_link(tdp, fip);
                  SET_I_OFFSET(fip, mastertemplate.dot_reclen);
                  ufs_dirrewrite(fip, fdp, newparent, DT_DIR, 0);
                  cache_purge(fdvp);
          }
          error = ufs_dirremove(fdvp, fip, fcnp->cn_flags, 0);
          /*
           * The kern_renameat() looks up the fvp using the DELETE flag, which
           * causes the removal of the name cache entry for fvp.
           * As the relookup of the fvp is done in two steps:
           * ufs_lookup_ino() and then VFS_VGET(), another thread might do a
           * normal lookup of the from name just before the VFS_VGET() call,
           * causing the cache entry to be re-instantiated.
           *
           * The same issue also applies to tvp if it exists as
           * otherwise we may have a stale name cache entry for the new
           * name that references the old i-node if it has other links
           * or open file descriptors.
           */
          cache_vop_rename(fdvp, fvp, tdvp, tvp, fcnp, tcnp);
  
  unlockout:
          if (want_seqc_end) {
                  if (tvp != NULL)
                          vn_seqc_write_end(tvp);
                  vn_seqc_write_end(tdvp);
                  vn_seqc_write_end(fvp);
                  vn_seqc_write_end(fdvp);
          }
  
          if (checkpath_locked)
                  sx_xunlock(&VFSTOUFS(mp)->um_checkpath_lock);
  
          vput(fdvp);
          vput(fvp);
  
          /*
           * If compaction or fsync was requested do it in
           * ffs_vput_pair() now that other locks are no longer needed.
           */
          if (error == 0 && endoff != 0) {
                  UFS_INODE_SET_FLAG(tdp, IN_ENDOFF);
                  SET_I_ENDOFF(tdp, endoff);
          }
          VOP_VPUT_PAIR(tdvp, &tvp, true);
          return (error);
  
  bad:
          fip->i_effnlink--;
          fip->i_nlink--;
          DIP_SET(fip, i_nlink, fip->i_nlink);
          UFS_INODE_SET_FLAG(fip, IN_CHANGE);
          if (DOINGSOFTDEP(fvp))
                  softdep_revert_link(tdp, fip);
          goto unlockout;
  
  releout:
          if (want_seqc_end) {
                  if (tvp != NULL)
                          vn_seqc_write_end(tvp);
                  vn_seqc_write_end(tdvp);
                  vn_seqc_write_end(fvp);
                  vn_seqc_write_end(fdvp);
          }
  
          vrele(fdvp);
          vrele(fvp);
          vrele(tdvp);
          if (tvp)
                  vrele(tvp);
  
          return (error);
  }
  
  #ifdef UFS_ACL
  static int
  ufs_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp,
      mode_t dmode, struct ucred *cred, struct thread *td)
  {
          int error;
          struct inode *ip = VTOI(tvp);
          struct acl *dacl, *acl;
  
          acl = acl_alloc(M_WAITOK);
          dacl = acl_alloc(M_WAITOK);
  
          /*
           * Retrieve default ACL from parent, if any.
           */
          error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
          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);
                          UFS_INODE_SET_MODE(ip, 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.
                   */
                  UFS_INODE_SET_MODE(ip, dmode);
                  DIP_SET(ip, i_mode, dmode);
                  error = 0;
                  goto out;
  
          default:
                  goto out;
          }
  
          /*
           * 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, cred, td);
          if (error == 0)
                  error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td);
          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:
                  goto out;
          }
  
  out:
          acl_free(acl);
          acl_free(dacl);
  
          return (error);
  }
  
  static int
  ufs_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp,
      mode_t mode, struct ucred *cred, struct thread *td)
  {
          int error;
          struct inode *ip = VTOI(tvp);
          struct acl *acl;
  
          acl = acl_alloc(M_WAITOK);
  
          /*
           * Retrieve default ACL for parent, if any.
           */
          error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
          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);
                          UFS_INODE_SET_MODE(ip, mode);
                          DIP_SET(ip, i_mode, mode);
                          ufs_sync_acl_from_inode(ip, acl);
                          break;
                  }
                  /* FALLTHROUGH */
  
          case EOPNOTSUPP:
                  /*
                   * Just use the mode as-is.
                   */
                  UFS_INODE_SET_MODE(ip, mode);
                  DIP_SET(ip, i_mode, mode);
                  error = 0;
                  goto out;
  
          default:
                  goto out;
          }
  
          /*
           * 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, cred, td);
          switch (error) {
          case 0:
                  break;
  
          case EOPNOTSUPP:
                  /*
                   * XXX: This should not happen, as EOPNOTSUPP above was
                   * supposed to free acl.
                   */
                  printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
                      "but no VOP_SETACL()\n");
                  /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
                      "but no VOP_SETACL()"); */
                  break;
  
          default:
                  goto out;
          }
  
  out:
          acl_free(acl);
  
          return (error);
  }
  
  static int
  ufs_do_nfs4_acl_inheritance(struct vnode *dvp, struct vnode *tvp,
      mode_t child_mode, struct ucred *cred, struct thread *td)
  {
          int error;
          struct acl *parent_aclp, *child_aclp;
  
          parent_aclp = acl_alloc(M_WAITOK);
          child_aclp = acl_alloc(M_WAITOK | M_ZERO);
  
          error = ufs_getacl_nfs4_internal(dvp, parent_aclp, td);
          if (error)
                  goto out;
          acl_nfs4_compute_inherited_acl(parent_aclp, child_aclp,
              child_mode, VTOI(tvp)->i_uid, tvp->v_type == VDIR);
          error = ufs_setacl_nfs4_internal(tvp, child_aclp, td);
          if (error)
                  goto out;
  out:
          acl_free(parent_aclp);
          acl_free(child_aclp);
  
          return (error);
  }
  #endif
  
  /*
   * Mkdir system call
   */
  static int
  ufs_mkdir(
          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;
          int error, dmode;
          long blkoff;
  
          dp = VTOI(dvp);
          error = ufs_sync_nlink(dvp, NULL);
          if (error != 0)
                  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.
           */
          if (dp->i_effnlink < 2) {
                  print_bad_link_count("ufs_mkdir", dvp);
                  error = EINVAL;
                  goto out;
          }
  
          if (DOINGSUJ(dvp)) {
                  error = softdep_prelink(dvp, NULL, cnp);
                  if (error != 0) {
                          MPASS(error == ERELOOKUP);
                          return (error);
                  }
          }
  
          error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp);
          if (error)
                  goto out;
          vn_seqc_write_begin(tvp);
          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;
                  gid_t ucred_group;
                  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 = &ucred_group;
                                  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))) {
                          if (DOINGSOFTDEP(tvp))
                                  softdep_revert_link(dp, ip);
                          UFS_VFREE(tvp, ip->i_number, dmode);
                          vn_seqc_write_end(tvp);
                          vgone(tvp);
                          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))) {
                  if (DOINGSOFTDEP(tvp))
                          softdep_revert_link(dp, ip);
                  UFS_VFREE(tvp, ip->i_number, dmode);
                  vn_seqc_write_end(tvp);
                  vgone(tvp);
                  vput(tvp);
                  return (error);
          }
  #endif
  #endif  /* !SUIDDIR */
          UFS_INODE_SET_FLAG(ip, IN_ACCESS | IN_CHANGE | IN_UPDATE);
          UFS_INODE_SET_MODE(ip, dmode);
          DIP_SET(ip, i_mode, dmode);
          tvp->v_type = VDIR;     /* Rest init'd in getnewvnode(). */
          ip->i_effnlink = 2;
          ip->i_nlink = 2;
          DIP_SET(ip, i_nlink, 2);
  
          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);
          UFS_INODE_SET_FLAG(dp, IN_CHANGE);
          if (DOINGSOFTDEP(dvp))
                  softdep_setup_mkdir(dp, ip);
          error = UFS_UPDATE(dvp, !DOINGSOFTDEP(dvp) && !DOINGASYNC(dvp));
          if (error)
                  goto bad;
  #ifdef MAC
          if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) {
                  error = mac_vnode_create_extattr(cnp->cn_cred, dvp->v_mount,
                      dvp, tvp, cnp);
                  if (error)
                          goto bad;
          }
  #endif
  #ifdef UFS_ACL
          if (dvp->v_mount->mnt_flag & MNT_ACLS) {
                  error = ufs_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
                      cnp->cn_cred, curthread);
                  if (error)
                          goto bad;
          } else if (dvp->v_mount->mnt_flag & MNT_NFS4ACLS) {
                  error = ufs_do_nfs4_acl_inheritance(dvp, tvp, dmode,
                      cnp->cn_cred, curthread);
                  if (error)
                          goto bad;
          }
  #endif /* !UFS_ACL */
  
          /*
           * Initialize directory with "." and ".." from static template.
           */
          if (!OFSFMT(dvp))
                  dtp = &mastertemplate;
          else
                  dtp = (struct dirtemplate *)&omastertemplate;
          dirtemplate = *dtp;
          dirtemplate.dot_ino = ip->i_number;
          dirtemplate.dotdot_ino = dp->i_number;
          vnode_pager_setsize(tvp, DIRBLKSIZ);
          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);
          UFS_INODE_SET_FLAG(ip, IN_SIZEMOD | IN_CHANGE | IN_UPDATE);
          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;
                  vn_seqc_write_end(tvp);
          } else {
                  dp->i_effnlink--;
                  dp->i_nlink--;
                  DIP_SET(dp, i_nlink, dp->i_nlink);
                  UFS_INODE_SET_FLAG(dp, IN_CHANGE);
                  /*
                   * 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);
                  UFS_INODE_SET_FLAG(ip, IN_CHANGE);
                  if (DOINGSOFTDEP(tvp))
                          softdep_revert_mkdir(dp, ip);
                  vn_seqc_write_end(tvp);
                  vgone(tvp);
                  vput(tvp);
          }
  out:
          return (error);
  }
  
  /*
   * Rmdir system call.
   */
  static int
  ufs_rmdir(
          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;
  
          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 (dp->i_effnlink <= 2) {
                  if (dp->i_effnlink == 2)
                          print_bad_link_count("ufs_rmdir", dvp);
                  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;
          }
          if (DOINGSUJ(dvp)) {
                  error = softdep_prelink(dvp, vp, cnp);
                  if (error != 0) {
                          MPASS(error == ERELOOKUP);
                          return (error);
                  }
          }
  
  #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_setup_rmdir(dp, ip);
          error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1);
          if (error) {
                  dp->i_effnlink++;
                  ip->i_effnlink++;
                  if (DOINGSOFTDEP(vp))
                          softdep_revert_rmdir(dp, ip);
                  goto out;
          }
          /*
           * 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);
                  UFS_INODE_SET_FLAG(dp, IN_CHANGE);
                  error = UFS_UPDATE(dvp, 0);
                  ip->i_nlink--;
                  DIP_SET(ip, i_nlink, ip->i_nlink);
                  UFS_INODE_SET_FLAG(ip, IN_CHANGE);
          }
          cache_vop_rmdir(dvp, 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(
          struct vop_symlink_args /* {
                  struct vnode *a_dvp;
                  struct vnode **a_vpp;
                  struct componentname *a_cnp;
                  struct vattr *a_vap;
                  const 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, "ufs_symlink");
          if (error)
                  return (error);
          vp = *vpp;
          len = strlen(ap->a_target);
          if (len < VFSTOUFS(vp->v_mount)->um_maxsymlinklen) {
                  ip = VTOI(vp);
                  bcopy(ap->a_target, DIP(ip, i_shortlink), len);
                  ip->i_size = len;
                  DIP_SET(ip, i_size, len);
                  UFS_INODE_SET_FLAG(ip, IN_SIZEMOD | IN_CHANGE | IN_UPDATE);
                  error = UFS_UPDATE(vp, 0);
          } else
                  error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target),
                      len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
                      ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
          if (error)
                  vput(vp);
          return (error);
  }
  
  /*
   * Vnode op for reading directories.
   */
  int
  ufs_readdir(
          struct vop_readdir_args /* {
                  struct vnode *a_vp;
                  struct uio *a_uio;
                  struct ucred *a_cred;
                  int *a_eofflag;
                  int *a_ncookies;
                  uint64_t **a_cookies;
          } */ *ap)
  {
          struct vnode *vp = ap->a_vp;
          struct uio *uio = ap->a_uio;
          struct buf *bp;
          struct inode *ip;
          struct direct *dp, *edp;
          uint64_t *cookies;
          struct dirent dstdp;
          off_t offset, startoffset;
          size_t readcnt, skipcnt;
          ssize_t startresid;
          u_int ncookies;
          int error;
  
          if (uio->uio_offset < 0)
                  return (EINVAL);
          ip = VTOI(vp);
          if (ip->i_effnlink == 0)
                  return (0);
          if (ap->a_ncookies != NULL) {
                  if (uio->uio_resid < 0)
                          ncookies = 0;
                  else
                          ncookies = uio->uio_resid;
                  if (uio->uio_offset >= ip->i_size)
                          ncookies = 0;
                  else if (ip->i_size - uio->uio_offset < ncookies)
                          ncookies = ip->i_size - uio->uio_offset;
                  ncookies = ncookies / (offsetof(struct direct, d_name) + 4) + 1;
                  cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK);
                  *ap->a_ncookies = ncookies;
                  *ap->a_cookies = cookies;
          } else {
                  ncookies = 0;
                  cookies = NULL;
          }
          offset = startoffset = uio->uio_offset;
          startresid = uio->uio_resid;
          error = 0;
          while (error == 0 && uio->uio_resid > 0 &&
              uio->uio_offset < ip->i_size) {
                  error = UFS_BLKATOFF(vp, uio->uio_offset, NULL, &bp);
                  if (error)
                          break;
                  if (bp->b_offset + bp->b_bcount > ip->i_size)
                          readcnt = ip->i_size - bp->b_offset;
                  else
                          readcnt = bp->b_bcount;
                  skipcnt = (size_t)(uio->uio_offset - bp->b_offset) &
                      ~(size_t)(DIRBLKSIZ - 1);
                  offset = bp->b_offset + skipcnt;
                  dp = (struct direct *)&bp->b_data[skipcnt];
                  edp = (struct direct *)&bp->b_data[readcnt];
                  while (error == 0 && uio->uio_resid > 0 && dp < edp) {
                          if (dp->d_reclen <= offsetof(struct direct, d_name) ||
                              (caddr_t)dp + dp->d_reclen > (caddr_t)edp) {
                                  error = EIO;
                                  break;
                          }
  #if BYTE_ORDER == LITTLE_ENDIAN
                          /* Old filesystem format. */
                          if (OFSFMT(vp)) {
                                  dstdp.d_namlen = dp->d_type;
                                  dstdp.d_type = dp->d_namlen;
                          } else
  #endif
                          {
                                  dstdp.d_namlen = dp->d_namlen;
                                  dstdp.d_type = dp->d_type;
                          }
                          if (offsetof(struct direct, d_name) + dstdp.d_namlen >
                              dp->d_reclen) {
                                  error = EIO;
                                  break;
                          }
                          if (offset < startoffset || dp->d_ino == 0)
                                  goto nextentry;
                          dstdp.d_fileno = dp->d_ino;
                          dstdp.d_reclen = GENERIC_DIRSIZ(&dstdp);
                          bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen);
                          /* NOTE: d_off is the offset of the *next* entry. */
                          dstdp.d_off = offset + dp->d_reclen;
                          dirent_terminate(&dstdp);
                          if (dstdp.d_reclen > uio->uio_resid) {
                                  if (uio->uio_resid == startresid)
                                          error = EINVAL;
                                  else
                                          error = EJUSTRETURN;
                                  break;
                          }
                          /* Advance dp. */
                          error = uiomove((caddr_t)&dstdp, dstdp.d_reclen, uio);
                          if (error)
                                  break;
                          if (cookies != NULL) {
                                  KASSERT(ncookies > 0,
                                      ("ufs_readdir: cookies buffer too small"));
                                  *cookies = offset + dp->d_reclen;
                                  cookies++;
                                  ncookies--;
                          }
  nextentry:
                          offset += dp->d_reclen;
                          dp = (struct direct *)((caddr_t)dp + dp->d_reclen);
                  }
                  bqrelse(bp);
                  uio->uio_offset = offset;
          }
          /* We need to correct uio_offset. */
          uio->uio_offset = offset;
          if (error == EJUSTRETURN)
                  error = 0;
          if (ap->a_ncookies != NULL) {
                  if (error == 0) {
                          *ap->a_ncookies -= ncookies;
                  } else {
                          free(*ap->a_cookies, M_TEMP);
                          *ap->a_ncookies = 0;
                          *ap->a_cookies = NULL;
                  }
          }
          if (error == 0 && ap->a_eofflag)
                  *ap->a_eofflag = ip->i_size <= uio->uio_offset;
          return (error);
  }
  
  /*
   * Return target name of a symbolic link
   */
  static int
  ufs_readlink(
          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 < VFSTOUFS(vp->v_mount)->um_maxsymlinklen)
                  return (uiomove(DIP(ip, i_shortlink), 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(
          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;
          ufs2_daddr_t blkno;
          int error;
  
          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 (0);
                  }
                  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_STRATEGY(VFSTOUFS(vp->v_mount)->um_bo, bp);
          return (0);
  }
  
  /*
   * Print out the contents of an inode.
   */
  static int
  ufs_print(
          struct vop_print_args /* {
                  struct vnode *a_vp;
          } */ *ap)
  {
          struct vnode *vp = ap->a_vp;
          struct inode *ip = VTOI(vp);
  
          printf("\tnlink=%d, effnlink=%d, size=%jd", ip->i_nlink,
              ip->i_effnlink, (intmax_t)ip->i_size);
          if (I_IS_UFS2(ip))
                  printf(", extsize %d", ip->i_din2->di_extsize);
          printf("\n\tgeneration=%jx, uid=%d, gid=%d, flags=0x%b\n",
              (uintmax_t)ip->i_gen, ip->i_uid, ip->i_gid,
              (u_int)ip->i_flags, PRINT_INODE_FLAGS);
          printf("\tino %lu, on dev %s", (u_long)ip->i_number,
              devtoname(ITODEV(ip)));
          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(
          struct vop_close_args /* {
                  struct vnode *a_vp;
                  int  a_fflag;
                  struct ucred *a_cred;
                  struct thread *a_td;
          } */ *ap)
  {
  
          ufs_close(ap);
          return (fifo_specops.vop_close(ap));
  }
  
  /*
   * Return POSIX pathconf information applicable to ufs filesystems.
   */
  static int
  ufs_pathconf(
          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 = UFS_LINK_MAX;
                  break;
          case _PC_NAME_MAX:
                  *ap->a_retval = UFS_MAXNAMLEN;
                  break;
          case _PC_PIPE_BUF:
                  if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
                          *ap->a_retval = PIPE_BUF;
                  else
                          error = EINVAL;
                  break;
          case _PC_CHOWN_RESTRICTED:
                  *ap->a_retval = 1;
                  break;
          case _PC_NO_TRUNC:
                  *ap->a_retval = 1;
                  break;
  #ifdef UFS_ACL
          case _PC_ACL_EXTENDED:
                  if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
                          *ap->a_retval = 1;
                  else
                          *ap->a_retval = 0;
                  break;
          case _PC_ACL_NFS4:
                  if (ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS)
                          *ap->a_retval = 1;
                  else
                          *ap->a_retval = 0;
                  break;
  #endif
          case _PC_ACL_PATH_MAX:
  #ifdef UFS_ACL
                  if (ap->a_vp->v_mount->mnt_flag & (MNT_ACLS | MNT_NFS4ACLS))
                          *ap->a_retval = ACL_MAX_ENTRIES;
                  else
                          *ap->a_retval = 3;
  #else
                  *ap->a_retval = 3;
  #endif
                  break;
  #ifdef MAC
          case _PC_MAC_PRESENT:
                  if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL)
                          *ap->a_retval = 1;
                  else
                          *ap->a_retval = 0;
                  break;
  #endif
          case _PC_MIN_HOLE_SIZE:
                  *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
                  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 = vop_stdpathconf(ap);
                  break;
          }
          return (error);
  }
  
  /*
   * Initialize the vnode associated with a new inode, handle aliased
   * vnodes.
   */
  int
  ufs_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
  {
          struct inode *ip;
          struct vnode *vp;
  
          vp = *vpp;
          ASSERT_VOP_LOCKED(vp, "ufs_vinit");
          ip = VTOI(vp);
          vp->v_type = IFTOVT(ip->i_mode);
          /*
           * Only unallocated inodes should be of type VNON.
           */
          if (ip->i_mode != 0 && vp->v_type == VNON)
                  return (EINVAL);
          if (vp->v_type == VFIFO)
                  vp->v_op = fifoops;
          if (ip->i_number == UFS_ROOTINO)
                  vp->v_vflag |= VV_ROOT;
          *vpp = vp;
          return (0);
  }
  
  /*
   * Allocate a new inode.
   * Vnode dvp must be locked.
   */
  static int
  ufs_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
      struct componentname *cnp, const char *callfunc)
  {
          struct inode *ip, *pdir;
          struct direct newdir;
          struct vnode *tvp;
          int error;
  
          pdir = VTOI(dvp);
          *vpp = NULL;
          if ((mode & IFMT) == 0)
                  mode |= IFREG;
  
          if (pdir->i_effnlink < 2) {
                  print_bad_link_count(callfunc, dvp);
                  return (EINVAL);
          }
          if (DOINGSUJ(dvp)) {
                  error = softdep_prelink(dvp, NULL, cnp);
                  if (error != 0) {
                          MPASS(error == ERELOOKUP);
                          return (error);
                  }
          }
          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;
                  gid_t ucred_group;
                  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 = &ucred_group;
                          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))) {
                          if (DOINGSOFTDEP(tvp))
                                  softdep_revert_link(pdir, ip);
                          UFS_VFREE(tvp, ip->i_number, mode);
                          vgone(tvp);
                          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))) {
                  if (DOINGSOFTDEP(tvp))
                          softdep_revert_link(pdir, ip);
                  UFS_VFREE(tvp, ip->i_number, mode);
                  vgone(tvp);
                  vput(tvp);
                  return (error);
          }
  #endif
  #endif  /* !SUIDDIR */
          vn_seqc_write_begin(tvp); /* Mostly to cover asserts */
          UFS_INODE_SET_FLAG(ip, IN_ACCESS | IN_CHANGE | IN_UPDATE);
          UFS_INODE_SET_MODE(ip, mode);
          DIP_SET(ip, i_mode, mode);
          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_setup_create(VTOI(dvp), ip);
          if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
              priv_check_cred(cnp->cn_cred, PRIV_VFS_SETGID)) {
                  UFS_INODE_SET_MODE(ip, 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_vnode_create_extattr(cnp->cn_cred, dvp->v_mount,
                      dvp, tvp, cnp);
                  if (error)
                          goto bad;
          }
  #endif
  #ifdef UFS_ACL
          if (dvp->v_mount->mnt_flag & MNT_ACLS) {
                  error = ufs_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
                      cnp->cn_cred, curthread);
                  if (error)
                          goto bad;
          } else if (dvp->v_mount->mnt_flag & MNT_NFS4ACLS) {
                  error = ufs_do_nfs4_acl_inheritance(dvp, tvp, mode,
                      cnp->cn_cred, curthread);
                  if (error)
                          goto bad;
          }
  #endif /* !UFS_ACL */
          ufs_makedirentry(ip, cnp, &newdir);
          error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL);
          if (error)
                  goto bad;
          vn_seqc_write_end(tvp);
          *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);
          UFS_INODE_SET_FLAG(ip, IN_CHANGE);
          if (DOINGSOFTDEP(tvp))
                  softdep_revert_create(VTOI(dvp), ip);
          vn_seqc_write_end(tvp);
          vgone(tvp);
          vput(tvp);
          return (error);
  }
  
  static int
  ufs_ioctl(struct vop_ioctl_args *ap)
  {
          struct vnode *vp;
          int error;
  
          vp = ap->a_vp;
          switch (ap->a_command) {
          case FIOSEEKDATA:
                  error = vn_lock(vp, LK_SHARED);
                  if (error == 0) {
                          error = ufs_bmap_seekdata(vp, (off_t *)ap->a_data);
                          VOP_UNLOCK(vp);
                  } else
                          error = EBADF;
                  return (error);
          case FIOSEEKHOLE:
                  return (vn_bmap_seekhole(vp, ap->a_command, (off_t *)ap->a_data,
                      ap->a_cred));
          default:
                  return (ENOTTY);
          }
  }
  
  static int
  ufs_read_pgcache(struct vop_read_pgcache_args *ap)
  {
          struct uio *uio;
          struct vnode *vp;
  
          uio = ap->a_uio;
          vp = ap->a_vp;
          VNPASS((vn_irflag_read(vp) & VIRF_PGREAD) != 0, vp);
  
          if (uio->uio_resid > ptoa(io_hold_cnt) || uio->uio_offset < 0 ||
              (ap->a_ioflag & IO_DIRECT) != 0)
                  return (EJUSTRETURN);
          return (vn_read_from_obj(vp, uio));
  }
  
  /* 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_accessx =          ufs_accessx,
          .vop_bmap =             ufs_bmap,
          .vop_fplookup_vexec =   ufs_fplookup_vexec,
          .vop_fplookup_symlink = VOP_EAGAIN,
          .vop_cachedlookup =     ufs_lookup,
          .vop_close =            ufs_close,
          .vop_create =           ufs_create,
          .vop_stat =             ufs_stat,
          .vop_getattr =          ufs_getattr,
          .vop_inactive =         ufs_inactive,
          .vop_ioctl =            ufs_ioctl,
          .vop_link =             ufs_link,
          .vop_lookup =           vfs_cache_lookup,
          .vop_mmapped =          ufs_mmapped,
          .vop_mkdir =            ufs_mkdir,
          .vop_mknod =            ufs_mknod,
          .vop_need_inactive =    ufs_need_inactive,
          .vop_open =             ufs_open,
          .vop_pathconf =         ufs_pathconf,
          .vop_poll =             vop_stdpoll,
          .vop_print =            ufs_print,
          .vop_read_pgcache =     ufs_read_pgcache,
          .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
  };
  VFS_VOP_VECTOR_REGISTER(ufs_vnodeops);
  
  struct vop_vector ufs_fifoops = {
          .vop_default =          &fifo_specops,
          .vop_fsync =            VOP_PANIC,
          .vop_accessx =          ufs_accessx,
          .vop_close =            ufsfifo_close,
          .vop_getattr =          ufs_getattr,
          .vop_inactive =         ufs_inactive,
          .vop_pathconf =         ufs_pathconf,
          .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
  };
  VFS_VOP_VECTOR_REGISTER(ufs_fifoops);

Cache object: 0db84e37ebd9488d5b5637fee81e855f