The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/ufs/ufs/ufs_vnops.c

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    1 /*-
    2  * Copyright (c) 1982, 1986, 1989, 1993, 1995
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/11.2/sys/ufs/ufs/ufs_vnops.c 332749 2018-04-19 02:47:21Z pfg $");
   39 
   40 #include "opt_quota.h"
   41 #include "opt_suiddir.h"
   42 #include "opt_ufs.h"
   43 #include "opt_ffs.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/malloc.h>
   48 #include <sys/namei.h>
   49 #include <sys/kernel.h>
   50 #include <sys/fcntl.h>
   51 #include <sys/filio.h>
   52 #include <sys/stat.h>
   53 #include <sys/bio.h>
   54 #include <sys/buf.h>
   55 #include <sys/mount.h>
   56 #include <sys/priv.h>
   57 #include <sys/refcount.h>
   58 #include <sys/unistd.h>
   59 #include <sys/vnode.h>
   60 #include <sys/dirent.h>
   61 #include <sys/lockf.h>
   62 #include <sys/conf.h>
   63 #include <sys/acl.h>
   64 
   65 #include <security/mac/mac_framework.h>
   66 
   67 #include <sys/file.h>           /* XXX */
   68 
   69 #include <vm/vm.h>
   70 #include <vm/vm_extern.h>
   71 
   72 #include <ufs/ufs/acl.h>
   73 #include <ufs/ufs/extattr.h>
   74 #include <ufs/ufs/quota.h>
   75 #include <ufs/ufs/inode.h>
   76 #include <ufs/ufs/dir.h>
   77 #include <ufs/ufs/ufsmount.h>
   78 #include <ufs/ufs/ufs_extern.h>
   79 #ifdef UFS_DIRHASH
   80 #include <ufs/ufs/dirhash.h>
   81 #endif
   82 #ifdef UFS_GJOURNAL
   83 #include <ufs/ufs/gjournal.h>
   84 FEATURE(ufs_gjournal, "Journaling support through GEOM for UFS");
   85 #endif
   86 
   87 #ifdef QUOTA
   88 FEATURE(ufs_quota, "UFS disk quotas support");
   89 FEATURE(ufs_quota64, "64bit UFS disk quotas support");
   90 #endif
   91 
   92 #ifdef SUIDDIR
   93 FEATURE(suiddir,
   94     "Give all new files in directory the same ownership as the directory");
   95 #endif
   96 
   97 
   98 #include <ufs/ffs/ffs_extern.h>
   99 
  100 static vop_accessx_t    ufs_accessx;
  101 static int ufs_chmod(struct vnode *, int, struct ucred *, struct thread *);
  102 static int ufs_chown(struct vnode *, uid_t, gid_t, struct ucred *, struct thread *);
  103 static vop_close_t      ufs_close;
  104 static vop_create_t     ufs_create;
  105 static vop_getattr_t    ufs_getattr;
  106 static vop_ioctl_t      ufs_ioctl;
  107 static vop_link_t       ufs_link;
  108 static int ufs_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *, const char *);
  109 static vop_markatime_t  ufs_markatime;
  110 static vop_mkdir_t      ufs_mkdir;
  111 static vop_mknod_t      ufs_mknod;
  112 static vop_open_t       ufs_open;
  113 static vop_pathconf_t   ufs_pathconf;
  114 static vop_print_t      ufs_print;
  115 static vop_readlink_t   ufs_readlink;
  116 static vop_remove_t     ufs_remove;
  117 static vop_rename_t     ufs_rename;
  118 static vop_rmdir_t      ufs_rmdir;
  119 static vop_setattr_t    ufs_setattr;
  120 static vop_strategy_t   ufs_strategy;
  121 static vop_symlink_t    ufs_symlink;
  122 static vop_whiteout_t   ufs_whiteout;
  123 static vop_close_t      ufsfifo_close;
  124 static vop_kqfilter_t   ufsfifo_kqfilter;
  125 
  126 SYSCTL_NODE(_vfs, OID_AUTO, ufs, CTLFLAG_RD, 0, "UFS filesystem");
  127 
  128 /*
  129  * A virgin directory (no blushing please).
  130  */
  131 static struct dirtemplate mastertemplate = {
  132         0, 12, DT_DIR, 1, ".",
  133         0, DIRBLKSIZ - 12, DT_DIR, 2, ".."
  134 };
  135 static struct odirtemplate omastertemplate = {
  136         0, 12, 1, ".",
  137         0, DIRBLKSIZ - 12, 2, ".."
  138 };
  139 
  140 static void
  141 ufs_itimes_locked(struct vnode *vp)
  142 {
  143         struct inode *ip;
  144         struct timespec ts;
  145 
  146         ASSERT_VI_LOCKED(vp, __func__);
  147 
  148         ip = VTOI(vp);
  149         if (UFS_RDONLY(ip))
  150                 goto out;
  151         if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
  152                 return;
  153 
  154         if ((vp->v_type == VBLK || vp->v_type == VCHR) && !DOINGSOFTDEP(vp))
  155                 ip->i_flag |= IN_LAZYMOD;
  156         else if (((vp->v_mount->mnt_kern_flag &
  157                     (MNTK_SUSPENDED | MNTK_SUSPEND)) == 0) ||
  158                     (ip->i_flag & (IN_CHANGE | IN_UPDATE)))
  159                 ip->i_flag |= IN_MODIFIED;
  160         else if (ip->i_flag & IN_ACCESS)
  161                 ip->i_flag |= IN_LAZYACCESS;
  162         vfs_timestamp(&ts);
  163         if (ip->i_flag & IN_ACCESS) {
  164                 DIP_SET(ip, i_atime, ts.tv_sec);
  165                 DIP_SET(ip, i_atimensec, ts.tv_nsec);
  166         }
  167         if (ip->i_flag & IN_UPDATE) {
  168                 DIP_SET(ip, i_mtime, ts.tv_sec);
  169                 DIP_SET(ip, i_mtimensec, ts.tv_nsec);
  170         }
  171         if (ip->i_flag & IN_CHANGE) {
  172                 DIP_SET(ip, i_ctime, ts.tv_sec);
  173                 DIP_SET(ip, i_ctimensec, ts.tv_nsec);
  174                 DIP_SET(ip, i_modrev, DIP(ip, i_modrev) + 1);
  175         }
  176 
  177  out:
  178         ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
  179 }
  180 
  181 void
  182 ufs_itimes(struct vnode *vp)
  183 {
  184 
  185         VI_LOCK(vp);
  186         ufs_itimes_locked(vp);
  187         VI_UNLOCK(vp);
  188 }
  189 
  190 /*
  191  * Create a regular file
  192  */
  193 static int
  194 ufs_create(ap)
  195         struct vop_create_args /* {
  196                 struct vnode *a_dvp;
  197                 struct vnode **a_vpp;
  198                 struct componentname *a_cnp;
  199                 struct vattr *a_vap;
  200         } */ *ap;
  201 {
  202         int error;
  203 
  204         error =
  205             ufs_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
  206             ap->a_dvp, ap->a_vpp, ap->a_cnp, "ufs_create");
  207         if (error != 0)
  208                 return (error);
  209         if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
  210                 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
  211         return (0);
  212 }
  213 
  214 /*
  215  * Mknod vnode call
  216  */
  217 /* ARGSUSED */
  218 static int
  219 ufs_mknod(ap)
  220         struct vop_mknod_args /* {
  221                 struct vnode *a_dvp;
  222                 struct vnode **a_vpp;
  223                 struct componentname *a_cnp;
  224                 struct vattr *a_vap;
  225         } */ *ap;
  226 {
  227         struct vattr *vap = ap->a_vap;
  228         struct vnode **vpp = ap->a_vpp;
  229         struct inode *ip;
  230         ino_t ino;
  231         int error;
  232 
  233         error = ufs_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
  234             ap->a_dvp, vpp, ap->a_cnp, "ufs_mknod");
  235         if (error)
  236                 return (error);
  237         ip = VTOI(*vpp);
  238         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
  239         if (vap->va_rdev != VNOVAL) {
  240                 /*
  241                  * Want to be able to use this to make badblock
  242                  * inodes, so don't truncate the dev number.
  243                  */
  244                 DIP_SET(ip, i_rdev, vap->va_rdev);
  245         }
  246         /*
  247          * Remove inode, then reload it through VFS_VGET so it is
  248          * checked to see if it is an alias of an existing entry in
  249          * the inode cache.  XXX I don't believe this is necessary now.
  250          */
  251         (*vpp)->v_type = VNON;
  252         ino = ip->i_number;     /* Save this before vgone() invalidates ip. */
  253         vgone(*vpp);
  254         vput(*vpp);
  255         error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
  256         if (error) {
  257                 *vpp = NULL;
  258                 return (error);
  259         }
  260         return (0);
  261 }
  262 
  263 /*
  264  * Open called.
  265  */
  266 /* ARGSUSED */
  267 static int
  268 ufs_open(struct vop_open_args *ap)
  269 {
  270         struct vnode *vp = ap->a_vp;
  271         struct inode *ip;
  272 
  273         if (vp->v_type == VCHR || vp->v_type == VBLK)
  274                 return (EOPNOTSUPP);
  275 
  276         ip = VTOI(vp);
  277         /*
  278          * Files marked append-only must be opened for appending.
  279          */
  280         if ((ip->i_flags & APPEND) &&
  281             (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
  282                 return (EPERM);
  283         vnode_create_vobject(vp, DIP(ip, i_size), ap->a_td);
  284         return (0);
  285 }
  286 
  287 /*
  288  * Close called.
  289  *
  290  * Update the times on the inode.
  291  */
  292 /* ARGSUSED */
  293 static int
  294 ufs_close(ap)
  295         struct vop_close_args /* {
  296                 struct vnode *a_vp;
  297                 int  a_fflag;
  298                 struct ucred *a_cred;
  299                 struct thread *a_td;
  300         } */ *ap;
  301 {
  302         struct vnode *vp = ap->a_vp;
  303         int usecount;
  304 
  305         VI_LOCK(vp);
  306         usecount = vp->v_usecount;
  307         if (usecount > 1)
  308                 ufs_itimes_locked(vp);
  309         VI_UNLOCK(vp);
  310         return (0);
  311 }
  312 
  313 static int
  314 ufs_accessx(ap)
  315         struct vop_accessx_args /* {
  316                 struct vnode *a_vp;
  317                 accmode_t a_accmode;
  318                 struct ucred *a_cred;
  319                 struct thread *a_td;
  320         } */ *ap;
  321 {
  322         struct vnode *vp = ap->a_vp;
  323         struct inode *ip = VTOI(vp);
  324         accmode_t accmode = ap->a_accmode;
  325         int error;
  326 #ifdef QUOTA
  327         int relocked;
  328 #endif
  329 #ifdef UFS_ACL
  330         struct acl *acl;
  331         acl_type_t type;
  332 #endif
  333 
  334         /*
  335          * Disallow write attempts on read-only filesystems;
  336          * unless the file is a socket, fifo, or a block or
  337          * character device resident on the filesystem.
  338          */
  339         if (accmode & VMODIFY_PERMS) {
  340                 switch (vp->v_type) {
  341                 case VDIR:
  342                 case VLNK:
  343                 case VREG:
  344                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  345                                 return (EROFS);
  346 #ifdef QUOTA
  347                         /*
  348                          * Inode is accounted in the quotas only if struct
  349                          * dquot is attached to it. VOP_ACCESS() is called
  350                          * from vn_open_cred() and provides a convenient
  351                          * point to call getinoquota().
  352                          */
  353                         if (VOP_ISLOCKED(vp) != LK_EXCLUSIVE) {
  354 
  355                                 /*
  356                                  * Upgrade vnode lock, since getinoquota()
  357                                  * requires exclusive lock to modify inode.
  358                                  */
  359                                 relocked = 1;
  360                                 vhold(vp);
  361                                 vn_lock(vp, LK_UPGRADE | LK_RETRY);
  362                                 VI_LOCK(vp);
  363                                 if (vp->v_iflag & VI_DOOMED) {
  364                                         vdropl(vp);
  365                                         error = ENOENT;
  366                                         goto relock;
  367                                 }
  368                                 vdropl(vp);
  369                         } else
  370                                 relocked = 0;
  371                         error = getinoquota(ip);
  372 relock:
  373                         if (relocked)
  374                                 vn_lock(vp, LK_DOWNGRADE | LK_RETRY);
  375                         if (error != 0)
  376                                 return (error);
  377 #endif
  378                         break;
  379                 default:
  380                         break;
  381                 }
  382         }
  383 
  384         /*
  385          * If immutable bit set, nobody gets to write it.  "& ~VADMIN_PERMS"
  386          * permits the owner of the file to remove the IMMUTABLE flag.
  387          */
  388         if ((accmode & (VMODIFY_PERMS & ~VADMIN_PERMS)) &&
  389             (ip->i_flags & (IMMUTABLE | SF_SNAPSHOT)))
  390                 return (EPERM);
  391 
  392 #ifdef UFS_ACL
  393         if ((vp->v_mount->mnt_flag & (MNT_ACLS | MNT_NFS4ACLS)) != 0) {
  394                 if (vp->v_mount->mnt_flag & MNT_NFS4ACLS)
  395                         type = ACL_TYPE_NFS4;
  396                 else
  397                         type = ACL_TYPE_ACCESS;
  398 
  399                 acl = acl_alloc(M_WAITOK);
  400                 if (type == ACL_TYPE_NFS4)
  401                         error = ufs_getacl_nfs4_internal(vp, acl, ap->a_td);
  402                 else
  403                         error = VOP_GETACL(vp, type, acl, ap->a_cred, ap->a_td);
  404                 switch (error) {
  405                 case 0:
  406                         if (type == ACL_TYPE_NFS4) {
  407                                 error = vaccess_acl_nfs4(vp->v_type, ip->i_uid,
  408                                     ip->i_gid, acl, accmode, ap->a_cred, NULL);
  409                         } else {
  410                                 error = vfs_unixify_accmode(&accmode);
  411                                 if (error == 0)
  412                                         error = vaccess_acl_posix1e(vp->v_type, ip->i_uid,
  413                                             ip->i_gid, acl, accmode, ap->a_cred, NULL);
  414                         }
  415                         break;
  416                 default:
  417                         if (error != EOPNOTSUPP)
  418                                 printf(
  419 "ufs_accessx(): Error retrieving ACL on object (%d).\n",
  420                                     error);
  421                         /*
  422                          * XXX: Fall back until debugged.  Should
  423                          * eventually possibly log an error, and return
  424                          * EPERM for safety.
  425                          */
  426                         error = vfs_unixify_accmode(&accmode);
  427                         if (error == 0)
  428                                 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid,
  429                                     ip->i_gid, accmode, ap->a_cred, NULL);
  430                 }
  431                 acl_free(acl);
  432 
  433                 return (error);
  434         }
  435 #endif /* !UFS_ACL */
  436         error = vfs_unixify_accmode(&accmode);
  437         if (error == 0)
  438                 error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
  439                     accmode, ap->a_cred, NULL);
  440         return (error);
  441 }
  442 
  443 /* ARGSUSED */
  444 static int
  445 ufs_getattr(ap)
  446         struct vop_getattr_args /* {
  447                 struct vnode *a_vp;
  448                 struct vattr *a_vap;
  449                 struct ucred *a_cred;
  450         } */ *ap;
  451 {
  452         struct vnode *vp = ap->a_vp;
  453         struct inode *ip = VTOI(vp);
  454         struct vattr *vap = ap->a_vap;
  455 
  456         VI_LOCK(vp);
  457         ufs_itimes_locked(vp);
  458         if (I_IS_UFS1(ip)) {
  459                 vap->va_atime.tv_sec = ip->i_din1->di_atime;
  460                 vap->va_atime.tv_nsec = ip->i_din1->di_atimensec;
  461         } else {
  462                 vap->va_atime.tv_sec = ip->i_din2->di_atime;
  463                 vap->va_atime.tv_nsec = ip->i_din2->di_atimensec;
  464         }
  465         VI_UNLOCK(vp);
  466         /*
  467          * Copy from inode table
  468          */
  469         vap->va_fsid = dev2udev(ITOUMP(ip)->um_dev);
  470         vap->va_fileid = ip->i_number;
  471         vap->va_mode = ip->i_mode & ~IFMT;
  472         vap->va_nlink = ip->i_effnlink;
  473         vap->va_uid = ip->i_uid;
  474         vap->va_gid = ip->i_gid;
  475         if (I_IS_UFS1(ip)) {
  476                 vap->va_rdev = ip->i_din1->di_rdev;
  477                 vap->va_size = ip->i_din1->di_size;
  478                 vap->va_mtime.tv_sec = ip->i_din1->di_mtime;
  479                 vap->va_mtime.tv_nsec = ip->i_din1->di_mtimensec;
  480                 vap->va_ctime.tv_sec = ip->i_din1->di_ctime;
  481                 vap->va_ctime.tv_nsec = ip->i_din1->di_ctimensec;
  482                 vap->va_bytes = dbtob((u_quad_t)ip->i_din1->di_blocks);
  483                 vap->va_filerev = ip->i_din1->di_modrev;
  484         } else {
  485                 vap->va_rdev = ip->i_din2->di_rdev;
  486                 vap->va_size = ip->i_din2->di_size;
  487                 vap->va_mtime.tv_sec = ip->i_din2->di_mtime;
  488                 vap->va_mtime.tv_nsec = ip->i_din2->di_mtimensec;
  489                 vap->va_ctime.tv_sec = ip->i_din2->di_ctime;
  490                 vap->va_ctime.tv_nsec = ip->i_din2->di_ctimensec;
  491                 vap->va_birthtime.tv_sec = ip->i_din2->di_birthtime;
  492                 vap->va_birthtime.tv_nsec = ip->i_din2->di_birthnsec;
  493                 vap->va_bytes = dbtob((u_quad_t)ip->i_din2->di_blocks);
  494                 vap->va_filerev = ip->i_din2->di_modrev;
  495         }
  496         vap->va_flags = ip->i_flags;
  497         vap->va_gen = ip->i_gen;
  498         vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
  499         vap->va_type = IFTOVT(ip->i_mode);
  500         return (0);
  501 }
  502 
  503 /*
  504  * Set attribute vnode op. called from several syscalls
  505  */
  506 static int
  507 ufs_setattr(ap)
  508         struct vop_setattr_args /* {
  509                 struct vnode *a_vp;
  510                 struct vattr *a_vap;
  511                 struct ucred *a_cred;
  512         } */ *ap;
  513 {
  514         struct vattr *vap = ap->a_vap;
  515         struct vnode *vp = ap->a_vp;
  516         struct inode *ip = VTOI(vp);
  517         struct ucred *cred = ap->a_cred;
  518         struct thread *td = curthread;
  519         int error;
  520 
  521         /*
  522          * Check for unsettable attributes.
  523          */
  524         if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
  525             (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
  526             (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
  527             ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
  528                 return (EINVAL);
  529         }
  530         if (vap->va_flags != VNOVAL) {
  531                 if ((vap->va_flags & ~(SF_APPEND | SF_ARCHIVED | SF_IMMUTABLE |
  532                     SF_NOUNLINK | SF_SNAPSHOT | UF_APPEND | UF_ARCHIVE |
  533                     UF_HIDDEN | UF_IMMUTABLE | UF_NODUMP | UF_NOUNLINK |
  534                     UF_OFFLINE | UF_OPAQUE | UF_READONLY | UF_REPARSE |
  535                     UF_SPARSE | UF_SYSTEM)) != 0)
  536                         return (EOPNOTSUPP);
  537                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  538                         return (EROFS);
  539                 /*
  540                  * Callers may only modify the file flags on objects they
  541                  * have VADMIN rights for.
  542                  */
  543                 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  544                         return (error);
  545                 /*
  546                  * Unprivileged processes are not permitted to unset system
  547                  * flags, or modify flags if any system flags are set.
  548                  * Privileged non-jail processes may not modify system flags
  549                  * if securelevel > 0 and any existing system flags are set.
  550                  * Privileged jail processes behave like privileged non-jail
  551                  * processes if the security.jail.chflags_allowed sysctl is
  552                  * is non-zero; otherwise, they behave like unprivileged
  553                  * processes.
  554                  */
  555                 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
  556                         if (ip->i_flags &
  557                             (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND)) {
  558                                 error = securelevel_gt(cred, 0);
  559                                 if (error)
  560                                         return (error);
  561                         }
  562                         /* The snapshot flag cannot be toggled. */
  563                         if ((vap->va_flags ^ ip->i_flags) & SF_SNAPSHOT)
  564                                 return (EPERM);
  565                 } else {
  566                         if (ip->i_flags &
  567                             (SF_NOUNLINK | SF_IMMUTABLE | SF_APPEND) ||
  568                             ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
  569                                 return (EPERM);
  570                 }
  571                 ip->i_flags = vap->va_flags;
  572                 DIP_SET(ip, i_flags, vap->va_flags);
  573                 ip->i_flag |= IN_CHANGE;
  574                 error = UFS_UPDATE(vp, 0);
  575                 if (ip->i_flags & (IMMUTABLE | APPEND))
  576                         return (error);
  577         }
  578         /*
  579          * If immutable or append, no one can change any of its attributes
  580          * except the ones already handled (in some cases, file flags
  581          * including the immutability flags themselves for the superuser).
  582          */
  583         if (ip->i_flags & (IMMUTABLE | APPEND))
  584                 return (EPERM);
  585         /*
  586          * Go through the fields and update iff not VNOVAL.
  587          */
  588         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
  589                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  590                         return (EROFS);
  591                 if ((error = ufs_chown(vp, vap->va_uid, vap->va_gid, cred,
  592                     td)) != 0)
  593                         return (error);
  594         }
  595         if (vap->va_size != VNOVAL) {
  596                 /*
  597                  * XXX most of the following special cases should be in
  598                  * callers instead of in N filesystems.  The VDIR check
  599                  * mostly already is.
  600                  */
  601                 switch (vp->v_type) {
  602                 case VDIR:
  603                         return (EISDIR);
  604                 case VLNK:
  605                 case VREG:
  606                         /*
  607                          * Truncation should have an effect in these cases.
  608                          * Disallow it if the filesystem is read-only or
  609                          * the file is being snapshotted.
  610                          */
  611                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  612                                 return (EROFS);
  613                         if ((ip->i_flags & SF_SNAPSHOT) != 0)
  614                                 return (EPERM);
  615                         break;
  616                 default:
  617                         /*
  618                          * According to POSIX, the result is unspecified
  619                          * for file types other than regular files,
  620                          * directories and shared memory objects.  We
  621                          * don't support shared memory objects in the file
  622                          * system, and have dubious support for truncating
  623                          * symlinks.  Just ignore the request in other cases.
  624                          */
  625                         return (0);
  626                 }
  627                 if ((error = UFS_TRUNCATE(vp, vap->va_size, IO_NORMAL |
  628                     ((vap->va_vaflags & VA_SYNC) != 0 ? IO_SYNC : 0),
  629                     cred)) != 0)
  630                         return (error);
  631         }
  632         if (vap->va_atime.tv_sec != VNOVAL ||
  633             vap->va_mtime.tv_sec != VNOVAL ||
  634             vap->va_birthtime.tv_sec != VNOVAL) {
  635                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  636                         return (EROFS);
  637                 if ((ip->i_flags & SF_SNAPSHOT) != 0)
  638                         return (EPERM);
  639                 error = vn_utimes_perm(vp, vap, cred, td);
  640                 if (error != 0)
  641                         return (error);
  642                 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
  643                 if (vap->va_atime.tv_sec != VNOVAL) {
  644                         ip->i_flag &= ~IN_ACCESS;
  645                         DIP_SET(ip, i_atime, vap->va_atime.tv_sec);
  646                         DIP_SET(ip, i_atimensec, vap->va_atime.tv_nsec);
  647                 }
  648                 if (vap->va_mtime.tv_sec != VNOVAL) {
  649                         ip->i_flag &= ~IN_UPDATE;
  650                         DIP_SET(ip, i_mtime, vap->va_mtime.tv_sec);
  651                         DIP_SET(ip, i_mtimensec, vap->va_mtime.tv_nsec);
  652                 }
  653                 if (vap->va_birthtime.tv_sec != VNOVAL && I_IS_UFS2(ip)) {
  654                         ip->i_din2->di_birthtime = vap->va_birthtime.tv_sec;
  655                         ip->i_din2->di_birthnsec = vap->va_birthtime.tv_nsec;
  656                 }
  657                 error = UFS_UPDATE(vp, 0);
  658                 if (error)
  659                         return (error);
  660         }
  661         error = 0;
  662         if (vap->va_mode != (mode_t)VNOVAL) {
  663                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  664                         return (EROFS);
  665                 if ((ip->i_flags & SF_SNAPSHOT) != 0 && (vap->va_mode &
  666                    (S_IXUSR | S_IWUSR | S_IXGRP | S_IWGRP | S_IXOTH | S_IWOTH)))
  667                         return (EPERM);
  668                 error = ufs_chmod(vp, (int)vap->va_mode, cred, td);
  669         }
  670         return (error);
  671 }
  672 
  673 #ifdef UFS_ACL
  674 static int
  675 ufs_update_nfs4_acl_after_mode_change(struct vnode *vp, int mode,
  676     int file_owner_id, struct ucred *cred, struct thread *td)
  677 {
  678         int error;
  679         struct acl *aclp;
  680 
  681         aclp = acl_alloc(M_WAITOK);
  682         error = ufs_getacl_nfs4_internal(vp, aclp, td);
  683         /*
  684          * We don't have to handle EOPNOTSUPP here, as the filesystem claims
  685          * it supports ACLs.
  686          */
  687         if (error)
  688                 goto out;
  689 
  690         acl_nfs4_sync_acl_from_mode(aclp, mode, file_owner_id);
  691         error = ufs_setacl_nfs4_internal(vp, aclp, td);
  692 
  693 out:
  694         acl_free(aclp);
  695         return (error);
  696 }
  697 #endif /* UFS_ACL */
  698 
  699 /*
  700  * Mark this file's access time for update for vfs_mark_atime().  This
  701  * is called from execve() and mmap().
  702  */
  703 static int
  704 ufs_markatime(ap)
  705         struct vop_markatime_args /* {
  706                 struct vnode *a_vp;
  707         } */ *ap;
  708 {
  709         struct vnode *vp = ap->a_vp;
  710         struct inode *ip = VTOI(vp);
  711 
  712         VI_LOCK(vp);
  713         ip->i_flag |= IN_ACCESS;
  714         VI_UNLOCK(vp);
  715         /*
  716          * XXXKIB No UFS_UPDATE(ap->a_vp, 0) there.
  717          */
  718         return (0);
  719 }
  720 
  721 /*
  722  * Change the mode on a file.
  723  * Inode must be locked before calling.
  724  */
  725 static int
  726 ufs_chmod(vp, mode, cred, td)
  727         struct vnode *vp;
  728         int mode;
  729         struct ucred *cred;
  730         struct thread *td;
  731 {
  732         struct inode *ip = VTOI(vp);
  733         int error;
  734 
  735         /*
  736          * To modify the permissions on a file, must possess VADMIN
  737          * for that file.
  738          */
  739         if ((error = VOP_ACCESSX(vp, VWRITE_ACL, cred, td)))
  740                 return (error);
  741         /*
  742          * Privileged processes may set the sticky bit on non-directories,
  743          * as well as set the setgid bit on a file with a group that the
  744          * process is not a member of.  Both of these are allowed in
  745          * jail(8).
  746          */
  747         if (vp->v_type != VDIR && (mode & S_ISTXT)) {
  748                 if (priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0))
  749                         return (EFTYPE);
  750         }
  751         if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
  752                 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
  753                 if (error)
  754                         return (error);
  755         }
  756 
  757         /*
  758          * Deny setting setuid if we are not the file owner.
  759          */
  760         if ((mode & ISUID) && ip->i_uid != cred->cr_uid) {
  761                 error = priv_check_cred(cred, PRIV_VFS_ADMIN, 0);
  762                 if (error)
  763                         return (error);
  764         }
  765 
  766         ip->i_mode &= ~ALLPERMS;
  767         ip->i_mode |= (mode & ALLPERMS);
  768         DIP_SET(ip, i_mode, ip->i_mode);
  769         ip->i_flag |= IN_CHANGE;
  770 #ifdef UFS_ACL
  771         if ((vp->v_mount->mnt_flag & MNT_NFS4ACLS) != 0)
  772                 error = ufs_update_nfs4_acl_after_mode_change(vp, mode, ip->i_uid, cred, td);
  773 #endif
  774         if (error == 0 && (ip->i_flag & IN_CHANGE) != 0)
  775                 error = UFS_UPDATE(vp, 0);
  776 
  777         return (error);
  778 }
  779 
  780 /*
  781  * Perform chown operation on inode ip;
  782  * inode must be locked prior to call.
  783  */
  784 static int
  785 ufs_chown(vp, uid, gid, cred, td)
  786         struct vnode *vp;
  787         uid_t uid;
  788         gid_t gid;
  789         struct ucred *cred;
  790         struct thread *td;
  791 {
  792         struct inode *ip = VTOI(vp);
  793         uid_t ouid;
  794         gid_t ogid;
  795         int error = 0;
  796 #ifdef QUOTA
  797         int i;
  798         ufs2_daddr_t change;
  799 #endif
  800 
  801         if (uid == (uid_t)VNOVAL)
  802                 uid = ip->i_uid;
  803         if (gid == (gid_t)VNOVAL)
  804                 gid = ip->i_gid;
  805         /*
  806          * To modify the ownership of a file, must possess VADMIN for that
  807          * file.
  808          */
  809         if ((error = VOP_ACCESSX(vp, VWRITE_OWNER, cred, td)))
  810                 return (error);
  811         /*
  812          * To change the owner of a file, or change the group of a file to a
  813          * group of which we are not a member, the caller must have
  814          * privilege.
  815          */
  816         if (((uid != ip->i_uid && uid != cred->cr_uid) || 
  817             (gid != ip->i_gid && !groupmember(gid, cred))) &&
  818             (error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0)))
  819                 return (error);
  820         ogid = ip->i_gid;
  821         ouid = ip->i_uid;
  822 #ifdef QUOTA
  823         if ((error = getinoquota(ip)) != 0)
  824                 return (error);
  825         if (ouid == uid) {
  826                 dqrele(vp, ip->i_dquot[USRQUOTA]);
  827                 ip->i_dquot[USRQUOTA] = NODQUOT;
  828         }
  829         if (ogid == gid) {
  830                 dqrele(vp, ip->i_dquot[GRPQUOTA]);
  831                 ip->i_dquot[GRPQUOTA] = NODQUOT;
  832         }
  833         change = DIP(ip, i_blocks);
  834         (void) chkdq(ip, -change, cred, CHOWN);
  835         (void) chkiq(ip, -1, cred, CHOWN);
  836         for (i = 0; i < MAXQUOTAS; i++) {
  837                 dqrele(vp, ip->i_dquot[i]);
  838                 ip->i_dquot[i] = NODQUOT;
  839         }
  840 #endif
  841         ip->i_gid = gid;
  842         DIP_SET(ip, i_gid, gid);
  843         ip->i_uid = uid;
  844         DIP_SET(ip, i_uid, uid);
  845 #ifdef QUOTA
  846         if ((error = getinoquota(ip)) == 0) {
  847                 if (ouid == uid) {
  848                         dqrele(vp, ip->i_dquot[USRQUOTA]);
  849                         ip->i_dquot[USRQUOTA] = NODQUOT;
  850                 }
  851                 if (ogid == gid) {
  852                         dqrele(vp, ip->i_dquot[GRPQUOTA]);
  853                         ip->i_dquot[GRPQUOTA] = NODQUOT;
  854                 }
  855                 if ((error = chkdq(ip, change, cred, CHOWN)) == 0) {
  856                         if ((error = chkiq(ip, 1, cred, CHOWN)) == 0)
  857                                 goto good;
  858                         else
  859                                 (void) chkdq(ip, -change, cred, CHOWN|FORCE);
  860                 }
  861                 for (i = 0; i < MAXQUOTAS; i++) {
  862                         dqrele(vp, ip->i_dquot[i]);
  863                         ip->i_dquot[i] = NODQUOT;
  864                 }
  865         }
  866         ip->i_gid = ogid;
  867         DIP_SET(ip, i_gid, ogid);
  868         ip->i_uid = ouid;
  869         DIP_SET(ip, i_uid, ouid);
  870         if (getinoquota(ip) == 0) {
  871                 if (ouid == uid) {
  872                         dqrele(vp, ip->i_dquot[USRQUOTA]);
  873                         ip->i_dquot[USRQUOTA] = NODQUOT;
  874                 }
  875                 if (ogid == gid) {
  876                         dqrele(vp, ip->i_dquot[GRPQUOTA]);
  877                         ip->i_dquot[GRPQUOTA] = NODQUOT;
  878                 }
  879                 (void) chkdq(ip, change, cred, FORCE|CHOWN);
  880                 (void) chkiq(ip, 1, cred, FORCE|CHOWN);
  881                 (void) getinoquota(ip);
  882         }
  883         return (error);
  884 good:
  885         if (getinoquota(ip))
  886                 panic("ufs_chown: lost quota");
  887 #endif /* QUOTA */
  888         ip->i_flag |= IN_CHANGE;
  889         if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
  890                 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0)) {
  891                         ip->i_mode &= ~(ISUID | ISGID);
  892                         DIP_SET(ip, i_mode, ip->i_mode);
  893                 }
  894         }
  895         error = UFS_UPDATE(vp, 0);
  896         return (error);
  897 }
  898 
  899 static int
  900 ufs_remove(ap)
  901         struct vop_remove_args /* {
  902                 struct vnode *a_dvp;
  903                 struct vnode *a_vp;
  904                 struct componentname *a_cnp;
  905         } */ *ap;
  906 {
  907         struct inode *ip;
  908         struct vnode *vp = ap->a_vp;
  909         struct vnode *dvp = ap->a_dvp;
  910         int error;
  911         struct thread *td;
  912 
  913         td = curthread;
  914         ip = VTOI(vp);
  915         if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
  916             (VTOI(dvp)->i_flags & APPEND)) {
  917                 error = EPERM;
  918                 goto out;
  919         }
  920 #ifdef UFS_GJOURNAL
  921         ufs_gjournal_orphan(vp);
  922 #endif
  923         error = ufs_dirremove(dvp, ip, ap->a_cnp->cn_flags, 0);
  924         if (ip->i_nlink <= 0)
  925                 vp->v_vflag |= VV_NOSYNC;
  926         if ((ip->i_flags & SF_SNAPSHOT) != 0) {
  927                 /*
  928                  * Avoid deadlock where another thread is trying to
  929                  * update the inodeblock for dvp and is waiting on
  930                  * snaplk.  Temporary unlock the vnode lock for the
  931                  * unlinked file and sync the directory.  This should
  932                  * allow vput() of the directory to not block later on
  933                  * while holding the snapshot vnode locked, assuming
  934                  * that the directory hasn't been unlinked too.
  935                  */
  936                 VOP_UNLOCK(vp, 0);
  937                 (void) VOP_FSYNC(dvp, MNT_WAIT, td);
  938                 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
  939         }
  940 out:
  941         return (error);
  942 }
  943 
  944 static void
  945 print_bad_link_count(const char *funcname, struct vnode *dvp)
  946 {
  947         struct inode *dip;
  948 
  949         dip = VTOI(dvp);
  950         uprintf("%s: Bad link count %d on parent inode %jd in file system %s\n",
  951             funcname, dip->i_effnlink, (intmax_t)dip->i_number,
  952             dvp->v_mount->mnt_stat.f_mntonname);
  953 }
  954 
  955 /*
  956  * link vnode call
  957  */
  958 static int
  959 ufs_link(ap)
  960         struct vop_link_args /* {
  961                 struct vnode *a_tdvp;
  962                 struct vnode *a_vp;
  963                 struct componentname *a_cnp;
  964         } */ *ap;
  965 {
  966         struct vnode *vp = ap->a_vp;
  967         struct vnode *tdvp = ap->a_tdvp;
  968         struct componentname *cnp = ap->a_cnp;
  969         struct inode *ip;
  970         struct direct newdir;
  971         int error;
  972 
  973 #ifdef INVARIANTS
  974         if ((cnp->cn_flags & HASBUF) == 0)
  975                 panic("ufs_link: no name");
  976 #endif
  977         if (VTOI(tdvp)->i_effnlink < 2) {
  978                 print_bad_link_count("ufs_link", tdvp);
  979                 error = EINVAL;
  980                 goto out;
  981         }
  982         ip = VTOI(vp);
  983         if ((nlink_t)ip->i_nlink >= LINK_MAX) {
  984                 error = EMLINK;
  985                 goto out;
  986         }
  987         /*
  988          * The file may have been removed after namei droped the original
  989          * lock.
  990          */
  991         if (ip->i_effnlink == 0) {
  992                 error = ENOENT;
  993                 goto out;
  994         }
  995         if (ip->i_flags & (IMMUTABLE | APPEND)) {
  996                 error = EPERM;
  997                 goto out;
  998         }
  999         ip->i_effnlink++;
 1000         ip->i_nlink++;
 1001         DIP_SET(ip, i_nlink, ip->i_nlink);
 1002         ip->i_flag |= IN_CHANGE;
 1003         if (DOINGSOFTDEP(vp))
 1004                 softdep_setup_link(VTOI(tdvp), ip);
 1005         error = UFS_UPDATE(vp, !(DOINGSOFTDEP(vp) | DOINGASYNC(vp)));
 1006         if (!error) {
 1007                 ufs_makedirentry(ip, cnp, &newdir);
 1008                 error = ufs_direnter(tdvp, vp, &newdir, cnp, NULL, 0);
 1009         }
 1010 
 1011         if (error) {
 1012                 ip->i_effnlink--;
 1013                 ip->i_nlink--;
 1014                 DIP_SET(ip, i_nlink, ip->i_nlink);
 1015                 ip->i_flag |= IN_CHANGE;
 1016                 if (DOINGSOFTDEP(vp))
 1017                         softdep_revert_link(VTOI(tdvp), ip);
 1018         }
 1019 out:
 1020         return (error);
 1021 }
 1022 
 1023 /*
 1024  * whiteout vnode call
 1025  */
 1026 static int
 1027 ufs_whiteout(ap)
 1028         struct vop_whiteout_args /* {
 1029                 struct vnode *a_dvp;
 1030                 struct componentname *a_cnp;
 1031                 int a_flags;
 1032         } */ *ap;
 1033 {
 1034         struct vnode *dvp = ap->a_dvp;
 1035         struct componentname *cnp = ap->a_cnp;
 1036         struct direct newdir;
 1037         int error = 0;
 1038 
 1039         switch (ap->a_flags) {
 1040         case LOOKUP:
 1041                 /* 4.4 format directories support whiteout operations */
 1042                 if (dvp->v_mount->mnt_maxsymlinklen > 0)
 1043                         return (0);
 1044                 return (EOPNOTSUPP);
 1045 
 1046         case CREATE:
 1047                 /* create a new directory whiteout */
 1048 #ifdef INVARIANTS
 1049                 if ((cnp->cn_flags & SAVENAME) == 0)
 1050                         panic("ufs_whiteout: missing name");
 1051                 if (dvp->v_mount->mnt_maxsymlinklen <= 0)
 1052                         panic("ufs_whiteout: old format filesystem");
 1053 #endif
 1054 
 1055                 newdir.d_ino = WINO;
 1056                 newdir.d_namlen = cnp->cn_namelen;
 1057                 bcopy(cnp->cn_nameptr, newdir.d_name, (unsigned)cnp->cn_namelen + 1);
 1058                 newdir.d_type = DT_WHT;
 1059                 error = ufs_direnter(dvp, NULL, &newdir, cnp, NULL, 0);
 1060                 break;
 1061 
 1062         case DELETE:
 1063                 /* remove an existing directory whiteout */
 1064 #ifdef INVARIANTS
 1065                 if (dvp->v_mount->mnt_maxsymlinklen <= 0)
 1066                         panic("ufs_whiteout: old format filesystem");
 1067 #endif
 1068 
 1069                 cnp->cn_flags &= ~DOWHITEOUT;
 1070                 error = ufs_dirremove(dvp, NULL, cnp->cn_flags, 0);
 1071                 break;
 1072         default:
 1073                 panic("ufs_whiteout: unknown op");
 1074         }
 1075         return (error);
 1076 }
 1077 
 1078 static volatile int rename_restarts;
 1079 SYSCTL_INT(_vfs_ufs, OID_AUTO, rename_restarts, CTLFLAG_RD,
 1080     __DEVOLATILE(int *, &rename_restarts), 0,
 1081     "Times rename had to restart due to lock contention");
 1082 
 1083 /*
 1084  * Rename system call.
 1085  *      rename("foo", "bar");
 1086  * is essentially
 1087  *      unlink("bar");
 1088  *      link("foo", "bar");
 1089  *      unlink("foo");
 1090  * but ``atomically''.  Can't do full commit without saving state in the
 1091  * inode on disk which isn't feasible at this time.  Best we can do is
 1092  * always guarantee the target exists.
 1093  *
 1094  * Basic algorithm is:
 1095  *
 1096  * 1) Bump link count on source while we're linking it to the
 1097  *    target.  This also ensure the inode won't be deleted out
 1098  *    from underneath us while we work (it may be truncated by
 1099  *    a concurrent `trunc' or `open' for creation).
 1100  * 2) Link source to destination.  If destination already exists,
 1101  *    delete it first.
 1102  * 3) Unlink source reference to inode if still around. If a
 1103  *    directory was moved and the parent of the destination
 1104  *    is different from the source, patch the ".." entry in the
 1105  *    directory.
 1106  */
 1107 static int
 1108 ufs_rename(ap)
 1109         struct vop_rename_args  /* {
 1110                 struct vnode *a_fdvp;
 1111                 struct vnode *a_fvp;
 1112                 struct componentname *a_fcnp;
 1113                 struct vnode *a_tdvp;
 1114                 struct vnode *a_tvp;
 1115                 struct componentname *a_tcnp;
 1116         } */ *ap;
 1117 {
 1118         struct vnode *tvp = ap->a_tvp;
 1119         struct vnode *tdvp = ap->a_tdvp;
 1120         struct vnode *fvp = ap->a_fvp;
 1121         struct vnode *fdvp = ap->a_fdvp;
 1122         struct vnode *nvp;
 1123         struct componentname *tcnp = ap->a_tcnp;
 1124         struct componentname *fcnp = ap->a_fcnp;
 1125         struct thread *td = fcnp->cn_thread;
 1126         struct inode *fip, *tip, *tdp, *fdp;
 1127         struct direct newdir;
 1128         off_t endoff;
 1129         int doingdirectory, newparent;
 1130         int error = 0;
 1131         struct mount *mp;
 1132         ino_t ino;
 1133 
 1134 #ifdef INVARIANTS
 1135         if ((tcnp->cn_flags & HASBUF) == 0 ||
 1136             (fcnp->cn_flags & HASBUF) == 0)
 1137                 panic("ufs_rename: no name");
 1138 #endif
 1139         endoff = 0;
 1140         mp = tdvp->v_mount;
 1141         VOP_UNLOCK(tdvp, 0);
 1142         if (tvp && tvp != tdvp)
 1143                 VOP_UNLOCK(tvp, 0);
 1144         /*
 1145          * Check for cross-device rename.
 1146          */
 1147         if ((fvp->v_mount != tdvp->v_mount) ||
 1148             (tvp && (fvp->v_mount != tvp->v_mount))) {
 1149                 error = EXDEV;
 1150                 mp = NULL;
 1151                 goto releout;
 1152         }
 1153 relock:
 1154         /* 
 1155          * We need to acquire 2 to 4 locks depending on whether tvp is NULL
 1156          * and fdvp and tdvp are the same directory.  Subsequently we need
 1157          * to double-check all paths and in the directory rename case we
 1158          * need to verify that we are not creating a directory loop.  To
 1159          * handle this we acquire all but fdvp using non-blocking
 1160          * acquisitions.  If we fail to acquire any lock in the path we will
 1161          * drop all held locks, acquire the new lock in a blocking fashion,
 1162          * and then release it and restart the rename.  This acquire/release
 1163          * step ensures that we do not spin on a lock waiting for release.
 1164          */
 1165         error = vn_lock(fdvp, LK_EXCLUSIVE);
 1166         if (error)
 1167                 goto releout;
 1168         if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
 1169                 VOP_UNLOCK(fdvp, 0);
 1170                 error = vn_lock(tdvp, LK_EXCLUSIVE);
 1171                 if (error)
 1172                         goto releout;
 1173                 VOP_UNLOCK(tdvp, 0);
 1174                 atomic_add_int(&rename_restarts, 1);
 1175                 goto relock;
 1176         }
 1177         /*
 1178          * Re-resolve fvp to be certain it still exists and fetch the
 1179          * correct vnode.
 1180          */
 1181         error = ufs_lookup_ino(fdvp, NULL, fcnp, &ino);
 1182         if (error) {
 1183                 VOP_UNLOCK(fdvp, 0);
 1184                 VOP_UNLOCK(tdvp, 0);
 1185                 goto releout;
 1186         }
 1187         error = VFS_VGET(mp, ino, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
 1188         if (error) {
 1189                 VOP_UNLOCK(fdvp, 0);
 1190                 VOP_UNLOCK(tdvp, 0);
 1191                 if (error != EBUSY)
 1192                         goto releout;
 1193                 error = VFS_VGET(mp, ino, LK_EXCLUSIVE, &nvp);
 1194                 if (error != 0)
 1195                         goto releout;
 1196                 VOP_UNLOCK(nvp, 0);
 1197                 vrele(fvp);
 1198                 fvp = nvp;
 1199                 atomic_add_int(&rename_restarts, 1);
 1200                 goto relock;
 1201         }
 1202         vrele(fvp);
 1203         fvp = nvp;
 1204         /*
 1205          * Re-resolve tvp and acquire the vnode lock if present.
 1206          */
 1207         error = ufs_lookup_ino(tdvp, NULL, tcnp, &ino);
 1208         if (error != 0 && error != EJUSTRETURN) {
 1209                 VOP_UNLOCK(fdvp, 0);
 1210                 VOP_UNLOCK(tdvp, 0);
 1211                 VOP_UNLOCK(fvp, 0);
 1212                 goto releout;
 1213         }
 1214         /*
 1215          * If tvp disappeared we just carry on.
 1216          */
 1217         if (error == EJUSTRETURN && tvp != NULL) {
 1218                 vrele(tvp);
 1219                 tvp = NULL;
 1220         }
 1221         /*
 1222          * Get the tvp ino if the lookup succeeded.  We may have to restart
 1223          * if the non-blocking acquire fails.
 1224          */
 1225         if (error == 0) {
 1226                 nvp = NULL;
 1227                 error = VFS_VGET(mp, ino, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
 1228                 if (tvp)
 1229                         vrele(tvp);
 1230                 tvp = nvp;
 1231                 if (error) {
 1232                         VOP_UNLOCK(fdvp, 0);
 1233                         VOP_UNLOCK(tdvp, 0);
 1234                         VOP_UNLOCK(fvp, 0);
 1235                         if (error != EBUSY)
 1236                                 goto releout;
 1237                         error = VFS_VGET(mp, ino, LK_EXCLUSIVE, &nvp);
 1238                         if (error != 0)
 1239                                 goto releout;
 1240                         vput(nvp);
 1241                         atomic_add_int(&rename_restarts, 1);
 1242                         goto relock;
 1243                 }
 1244         }
 1245         fdp = VTOI(fdvp);
 1246         fip = VTOI(fvp);
 1247         tdp = VTOI(tdvp);
 1248         tip = NULL;
 1249         if (tvp)
 1250                 tip = VTOI(tvp);
 1251         if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
 1252             (VTOI(tdvp)->i_flags & APPEND))) {
 1253                 error = EPERM;
 1254                 goto unlockout;
 1255         }
 1256         /*
 1257          * Renaming a file to itself has no effect.  The upper layers should
 1258          * not call us in that case.  However, things could change after
 1259          * we drop the locks above.
 1260          */
 1261         if (fvp == tvp) {
 1262                 error = 0;
 1263                 goto unlockout;
 1264         }
 1265         doingdirectory = 0;
 1266         newparent = 0;
 1267         ino = fip->i_number;
 1268         if (fip->i_nlink >= LINK_MAX) {
 1269                 error = EMLINK;
 1270                 goto unlockout;
 1271         }
 1272         if ((fip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
 1273             || (fdp->i_flags & APPEND)) {
 1274                 error = EPERM;
 1275                 goto unlockout;
 1276         }
 1277         if ((fip->i_mode & IFMT) == IFDIR) {
 1278                 /*
 1279                  * Avoid ".", "..", and aliases of "." for obvious reasons.
 1280                  */
 1281                 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
 1282                     fdp == fip ||
 1283                     (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT) {
 1284                         error = EINVAL;
 1285                         goto unlockout;
 1286                 }
 1287                 if (fdp->i_number != tdp->i_number)
 1288                         newparent = tdp->i_number;
 1289                 doingdirectory = 1;
 1290         }
 1291         if ((fvp->v_type == VDIR && fvp->v_mountedhere != NULL) ||
 1292             (tvp != NULL && tvp->v_type == VDIR &&
 1293             tvp->v_mountedhere != NULL)) {
 1294                 error = EXDEV;
 1295                 goto unlockout;
 1296         }
 1297 
 1298         /*
 1299          * If ".." must be changed (ie the directory gets a new
 1300          * parent) then the source directory must not be in the
 1301          * directory hierarchy above the target, as this would
 1302          * orphan everything below the source directory. Also
 1303          * the user must have write permission in the source so
 1304          * as to be able to change "..".
 1305          */
 1306         if (doingdirectory && newparent) {
 1307                 error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
 1308                 if (error)
 1309                         goto unlockout;
 1310                 error = ufs_checkpath(ino, fdp->i_number, tdp, tcnp->cn_cred,
 1311                     &ino);
 1312                 /*
 1313                  * We encountered a lock that we have to wait for.  Unlock
 1314                  * everything else and VGET before restarting.
 1315                  */
 1316                 if (ino) {
 1317                         VOP_UNLOCK(fdvp, 0);
 1318                         VOP_UNLOCK(fvp, 0);
 1319                         VOP_UNLOCK(tdvp, 0);
 1320                         if (tvp)
 1321                                 VOP_UNLOCK(tvp, 0);
 1322                         error = VFS_VGET(mp, ino, LK_SHARED, &nvp);
 1323                         if (error == 0)
 1324                                 vput(nvp);
 1325                         atomic_add_int(&rename_restarts, 1);
 1326                         goto relock;
 1327                 }
 1328                 if (error)
 1329                         goto unlockout;
 1330                 if ((tcnp->cn_flags & SAVESTART) == 0)
 1331                         panic("ufs_rename: lost to startdir");
 1332         }
 1333         if (fip->i_effnlink == 0 || fdp->i_effnlink == 0 ||
 1334             tdp->i_effnlink == 0)
 1335                 panic("Bad effnlink fip %p, fdp %p, tdp %p", fip, fdp, tdp);
 1336 
 1337         /*
 1338          * 1) Bump link count while we're moving stuff
 1339          *    around.  If we crash somewhere before
 1340          *    completing our work, the link count
 1341          *    may be wrong, but correctable.
 1342          */
 1343         fip->i_effnlink++;
 1344         fip->i_nlink++;
 1345         DIP_SET(fip, i_nlink, fip->i_nlink);
 1346         fip->i_flag |= IN_CHANGE;
 1347         if (DOINGSOFTDEP(fvp))
 1348                 softdep_setup_link(tdp, fip);
 1349         error = UFS_UPDATE(fvp, !(DOINGSOFTDEP(fvp) | DOINGASYNC(fvp)));
 1350         if (error)
 1351                 goto bad;
 1352 
 1353         /*
 1354          * 2) If target doesn't exist, link the target
 1355          *    to the source and unlink the source.
 1356          *    Otherwise, rewrite the target directory
 1357          *    entry to reference the source inode and
 1358          *    expunge the original entry's existence.
 1359          */
 1360         if (tip == NULL) {
 1361                 if (ITODEV(tdp) != ITODEV(fip))
 1362                         panic("ufs_rename: EXDEV");
 1363                 if (doingdirectory && newparent) {
 1364                         /*
 1365                          * Account for ".." in new directory.
 1366                          * When source and destination have the same
 1367                          * parent we don't adjust the link count.  The
 1368                          * actual link modification is completed when
 1369                          * .. is rewritten below.
 1370                          */
 1371                         if ((nlink_t)tdp->i_nlink >= LINK_MAX) {
 1372                                 error = EMLINK;
 1373                                 goto bad;
 1374                         }
 1375                 }
 1376                 ufs_makedirentry(fip, tcnp, &newdir);
 1377                 error = ufs_direnter(tdvp, NULL, &newdir, tcnp, NULL, 1);
 1378                 if (error)
 1379                         goto bad;
 1380                 /* Setup tdvp for directory compaction if needed. */
 1381                 if (tdp->i_count && tdp->i_endoff &&
 1382                     tdp->i_endoff < tdp->i_size)
 1383                         endoff = tdp->i_endoff;
 1384         } else {
 1385                 if (ITODEV(tip) != ITODEV(tdp) || ITODEV(tip) != ITODEV(fip))
 1386                         panic("ufs_rename: EXDEV");
 1387                 /*
 1388                  * Short circuit rename(foo, foo).
 1389                  */
 1390                 if (tip->i_number == fip->i_number)
 1391                         panic("ufs_rename: same file");
 1392                 /*
 1393                  * If the parent directory is "sticky", then the caller
 1394                  * must possess VADMIN for the parent directory, or the
 1395                  * destination of the rename.  This implements append-only
 1396                  * directories.
 1397                  */
 1398                 if ((tdp->i_mode & S_ISTXT) &&
 1399                     VOP_ACCESS(tdvp, VADMIN, tcnp->cn_cred, td) &&
 1400                     VOP_ACCESS(tvp, VADMIN, tcnp->cn_cred, td)) {
 1401                         error = EPERM;
 1402                         goto bad;
 1403                 }
 1404                 /*
 1405                  * Target must be empty if a directory and have no links
 1406                  * to it. Also, ensure source and target are compatible
 1407                  * (both directories, or both not directories).
 1408                  */
 1409                 if ((tip->i_mode & IFMT) == IFDIR) {
 1410                         if ((tip->i_effnlink > 2) ||
 1411                             !ufs_dirempty(tip, tdp->i_number, tcnp->cn_cred)) {
 1412                                 error = ENOTEMPTY;
 1413                                 goto bad;
 1414                         }
 1415                         if (!doingdirectory) {
 1416                                 error = ENOTDIR;
 1417                                 goto bad;
 1418                         }
 1419                         cache_purge(tdvp);
 1420                 } else if (doingdirectory) {
 1421                         error = EISDIR;
 1422                         goto bad;
 1423                 }
 1424                 if (doingdirectory) {
 1425                         if (!newparent) {
 1426                                 tdp->i_effnlink--;
 1427                                 if (DOINGSOFTDEP(tdvp))
 1428                                         softdep_change_linkcnt(tdp);
 1429                         }
 1430                         tip->i_effnlink--;
 1431                         if (DOINGSOFTDEP(tvp))
 1432                                 softdep_change_linkcnt(tip);
 1433                 }
 1434                 error = ufs_dirrewrite(tdp, tip, fip->i_number,
 1435                     IFTODT(fip->i_mode),
 1436                     (doingdirectory && newparent) ? newparent : doingdirectory);
 1437                 if (error) {
 1438                         if (doingdirectory) {
 1439                                 if (!newparent) {
 1440                                         tdp->i_effnlink++;
 1441                                         if (DOINGSOFTDEP(tdvp))
 1442                                                 softdep_change_linkcnt(tdp);
 1443                                 }
 1444                                 tip->i_effnlink++;
 1445                                 if (DOINGSOFTDEP(tvp))
 1446                                         softdep_change_linkcnt(tip);
 1447                         }
 1448                 }
 1449                 if (doingdirectory && !DOINGSOFTDEP(tvp)) {
 1450                         /*
 1451                          * The only stuff left in the directory is "."
 1452                          * and "..". The "." reference is inconsequential
 1453                          * since we are quashing it. We have removed the "."
 1454                          * reference and the reference in the parent directory,
 1455                          * but there may be other hard links. The soft
 1456                          * dependency code will arrange to do these operations
 1457                          * after the parent directory entry has been deleted on
 1458                          * disk, so when running with that code we avoid doing
 1459                          * them now.
 1460                          */
 1461                         if (!newparent) {
 1462                                 tdp->i_nlink--;
 1463                                 DIP_SET(tdp, i_nlink, tdp->i_nlink);
 1464                                 tdp->i_flag |= IN_CHANGE;
 1465                         }
 1466                         tip->i_nlink--;
 1467                         DIP_SET(tip, i_nlink, tip->i_nlink);
 1468                         tip->i_flag |= IN_CHANGE;
 1469                 }
 1470         }
 1471 
 1472         /*
 1473          * 3) Unlink the source.  We have to resolve the path again to
 1474          * fixup the directory offset and count for ufs_dirremove.
 1475          */
 1476         if (fdvp == tdvp) {
 1477                 error = ufs_lookup_ino(fdvp, NULL, fcnp, &ino);
 1478                 if (error)
 1479                         panic("ufs_rename: from entry went away!");
 1480                 if (ino != fip->i_number)
 1481                         panic("ufs_rename: ino mismatch %ju != %ju\n",
 1482                             (uintmax_t)ino, (uintmax_t)fip->i_number);
 1483         }
 1484         /*
 1485          * If the source is a directory with a
 1486          * new parent, the link count of the old
 1487          * parent directory must be decremented
 1488          * and ".." set to point to the new parent.
 1489          */
 1490         if (doingdirectory && newparent) {
 1491                 /*
 1492                  * If tip exists we simply use its link, otherwise we must
 1493                  * add a new one.
 1494                  */
 1495                 if (tip == NULL) {
 1496                         tdp->i_effnlink++;
 1497                         tdp->i_nlink++;
 1498                         DIP_SET(tdp, i_nlink, tdp->i_nlink);
 1499                         tdp->i_flag |= IN_CHANGE;
 1500                         if (DOINGSOFTDEP(tdvp))
 1501                                 softdep_setup_dotdot_link(tdp, fip);
 1502                         error = UFS_UPDATE(tdvp, !(DOINGSOFTDEP(tdvp) |
 1503                                                    DOINGASYNC(tdvp)));
 1504                         /* Don't go to bad here as the new link exists. */
 1505                         if (error)
 1506                                 goto unlockout;
 1507                 } else if (DOINGSUJ(tdvp))
 1508                         /* Journal must account for each new link. */
 1509                         softdep_setup_dotdot_link(tdp, fip);
 1510                 fip->i_offset = mastertemplate.dot_reclen;
 1511                 ufs_dirrewrite(fip, fdp, newparent, DT_DIR, 0);
 1512                 cache_purge(fdvp);
 1513         }
 1514         error = ufs_dirremove(fdvp, fip, fcnp->cn_flags, 0);
 1515         /*
 1516          * The kern_renameat() looks up the fvp using the DELETE flag, which
 1517          * causes the removal of the name cache entry for fvp.
 1518          * As the relookup of the fvp is done in two steps:
 1519          * ufs_lookup_ino() and then VFS_VGET(), another thread might do a
 1520          * normal lookup of the from name just before the VFS_VGET() call,
 1521          * causing the cache entry to be re-instantiated.
 1522          *
 1523          * The same issue also applies to tvp if it exists as
 1524          * otherwise we may have a stale name cache entry for the new
 1525          * name that references the old i-node if it has other links
 1526          * or open file descriptors.
 1527          */
 1528         cache_purge(fvp);
 1529         if (tvp)
 1530                 cache_purge(tvp);
 1531         cache_purge_negative(tdvp);
 1532 
 1533 unlockout:
 1534         vput(fdvp);
 1535         vput(fvp);
 1536         if (tvp)
 1537                 vput(tvp);
 1538         /*
 1539          * If compaction or fsync was requested do it now that other locks
 1540          * are no longer needed.
 1541          */
 1542         if (error == 0 && endoff != 0) {
 1543                 error = UFS_TRUNCATE(tdvp, endoff, IO_NORMAL | IO_SYNC,
 1544                     tcnp->cn_cred);
 1545                 if (error != 0)
 1546                         vn_printf(tdvp,
 1547                             "ufs_rename: failed to truncate, error %d\n",
 1548                             error);
 1549 #ifdef UFS_DIRHASH
 1550                 else if (tdp->i_dirhash != NULL)
 1551                         ufsdirhash_dirtrunc(tdp, endoff);
 1552 #endif
 1553                 /*
 1554                  * Even if the directory compaction failed, rename was
 1555                  * succesful.  Do not propagate a UFS_TRUNCATE() error
 1556                  * to the caller.
 1557                  */
 1558                 error = 0;
 1559         }
 1560         if (error == 0 && tdp->i_flag & IN_NEEDSYNC)
 1561                 error = VOP_FSYNC(tdvp, MNT_WAIT, td);
 1562         vput(tdvp);
 1563         return (error);
 1564 
 1565 bad:
 1566         fip->i_effnlink--;
 1567         fip->i_nlink--;
 1568         DIP_SET(fip, i_nlink, fip->i_nlink);
 1569         fip->i_flag |= IN_CHANGE;
 1570         if (DOINGSOFTDEP(fvp))
 1571                 softdep_revert_link(tdp, fip);
 1572         goto unlockout;
 1573 
 1574 releout:
 1575         vrele(fdvp);
 1576         vrele(fvp);
 1577         vrele(tdvp);
 1578         if (tvp)
 1579                 vrele(tvp);
 1580 
 1581         return (error);
 1582 }
 1583 
 1584 #ifdef UFS_ACL
 1585 static int
 1586 ufs_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp,
 1587     mode_t dmode, struct ucred *cred, struct thread *td)
 1588 {
 1589         int error;
 1590         struct inode *ip = VTOI(tvp);
 1591         struct acl *dacl, *acl;
 1592 
 1593         acl = acl_alloc(M_WAITOK);
 1594         dacl = acl_alloc(M_WAITOK);
 1595 
 1596         /*
 1597          * Retrieve default ACL from parent, if any.
 1598          */
 1599         error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
 1600         switch (error) {
 1601         case 0:
 1602                 /*
 1603                  * Retrieved a default ACL, so merge mode and ACL if
 1604                  * necessary.  If the ACL is empty, fall through to
 1605                  * the "not defined or available" case.
 1606                  */
 1607                 if (acl->acl_cnt != 0) {
 1608                         dmode = acl_posix1e_newfilemode(dmode, acl);
 1609                         ip->i_mode = dmode;
 1610                         DIP_SET(ip, i_mode, dmode);
 1611                         *dacl = *acl;
 1612                         ufs_sync_acl_from_inode(ip, acl);
 1613                         break;
 1614                 }
 1615                 /* FALLTHROUGH */
 1616 
 1617         case EOPNOTSUPP:
 1618                 /*
 1619                  * Just use the mode as-is.
 1620                  */
 1621                 ip->i_mode = dmode;
 1622                 DIP_SET(ip, i_mode, dmode);
 1623                 error = 0;
 1624                 goto out;
 1625         
 1626         default:
 1627                 goto out;
 1628         }
 1629 
 1630         /*
 1631          * XXX: If we abort now, will Soft Updates notify the extattr
 1632          * code that the EAs for the file need to be released?
 1633          */
 1634         error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
 1635         if (error == 0)
 1636                 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td);
 1637         switch (error) {
 1638         case 0:
 1639                 break;
 1640 
 1641         case EOPNOTSUPP:
 1642                 /*
 1643                  * XXX: This should not happen, as EOPNOTSUPP above
 1644                  * was supposed to free acl.
 1645                  */
 1646                 printf("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()\n");
 1647                 /*
 1648                 panic("ufs_mkdir: VOP_GETACL() but no VOP_SETACL()");
 1649                  */
 1650                 break;
 1651 
 1652         default:
 1653                 goto out;
 1654         }
 1655 
 1656 out:
 1657         acl_free(acl);
 1658         acl_free(dacl);
 1659 
 1660         return (error);
 1661 }
 1662 
 1663 static int
 1664 ufs_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp,
 1665     mode_t mode, struct ucred *cred, struct thread *td)
 1666 {
 1667         int error;
 1668         struct inode *ip = VTOI(tvp);
 1669         struct acl *acl;
 1670 
 1671         acl = acl_alloc(M_WAITOK);
 1672 
 1673         /*
 1674          * Retrieve default ACL for parent, if any.
 1675          */
 1676         error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
 1677         switch (error) {
 1678         case 0:
 1679                 /*
 1680                  * Retrieved a default ACL, so merge mode and ACL if
 1681                  * necessary.
 1682                  */
 1683                 if (acl->acl_cnt != 0) {
 1684                         /*
 1685                          * Two possible ways for default ACL to not
 1686                          * be present.  First, the EA can be
 1687                          * undefined, or second, the default ACL can
 1688                          * be blank.  If it's blank, fall through to
 1689                          * the it's not defined case.
 1690                          */
 1691                         mode = acl_posix1e_newfilemode(mode, acl);
 1692                         ip->i_mode = mode;
 1693                         DIP_SET(ip, i_mode, mode);
 1694                         ufs_sync_acl_from_inode(ip, acl);
 1695                         break;
 1696                 }
 1697                 /* FALLTHROUGH */
 1698 
 1699         case EOPNOTSUPP:
 1700                 /*
 1701                  * Just use the mode as-is.
 1702                  */
 1703                 ip->i_mode = mode;
 1704                 DIP_SET(ip, i_mode, mode);
 1705                 error = 0;
 1706                 goto out;
 1707 
 1708         default:
 1709                 goto out;
 1710         }
 1711 
 1712         /*
 1713          * XXX: If we abort now, will Soft Updates notify the extattr
 1714          * code that the EAs for the file need to be released?
 1715          */
 1716         error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
 1717         switch (error) {
 1718         case 0:
 1719                 break;
 1720 
 1721         case EOPNOTSUPP:
 1722                 /*
 1723                  * XXX: This should not happen, as EOPNOTSUPP above was
 1724                  * supposed to free acl.
 1725                  */
 1726                 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
 1727                     "but no VOP_SETACL()\n");
 1728                 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
 1729                     "but no VOP_SETACL()"); */
 1730                 break;
 1731 
 1732         default:
 1733                 goto out;
 1734         }
 1735 
 1736 out:
 1737         acl_free(acl);
 1738 
 1739         return (error);
 1740 }
 1741 
 1742 static int
 1743 ufs_do_nfs4_acl_inheritance(struct vnode *dvp, struct vnode *tvp,
 1744     mode_t child_mode, struct ucred *cred, struct thread *td)
 1745 {
 1746         int error;
 1747         struct acl *parent_aclp, *child_aclp;
 1748 
 1749         parent_aclp = acl_alloc(M_WAITOK);
 1750         child_aclp = acl_alloc(M_WAITOK | M_ZERO);
 1751 
 1752         error = ufs_getacl_nfs4_internal(dvp, parent_aclp, td);
 1753         if (error)
 1754                 goto out;
 1755         acl_nfs4_compute_inherited_acl(parent_aclp, child_aclp,
 1756             child_mode, VTOI(tvp)->i_uid, tvp->v_type == VDIR);
 1757         error = ufs_setacl_nfs4_internal(tvp, child_aclp, td);
 1758         if (error)
 1759                 goto out;
 1760 out:
 1761         acl_free(parent_aclp);
 1762         acl_free(child_aclp);
 1763 
 1764         return (error);
 1765 }
 1766 #endif
 1767 
 1768 /*
 1769  * Mkdir system call
 1770  */
 1771 static int
 1772 ufs_mkdir(ap)
 1773         struct vop_mkdir_args /* {
 1774                 struct vnode *a_dvp;
 1775                 struct vnode **a_vpp;
 1776                 struct componentname *a_cnp;
 1777                 struct vattr *a_vap;
 1778         } */ *ap;
 1779 {
 1780         struct vnode *dvp = ap->a_dvp;
 1781         struct vattr *vap = ap->a_vap;
 1782         struct componentname *cnp = ap->a_cnp;
 1783         struct inode *ip, *dp;
 1784         struct vnode *tvp;
 1785         struct buf *bp;
 1786         struct dirtemplate dirtemplate, *dtp;
 1787         struct direct newdir;
 1788         int error, dmode;
 1789         long blkoff;
 1790 
 1791 #ifdef INVARIANTS
 1792         if ((cnp->cn_flags & HASBUF) == 0)
 1793                 panic("ufs_mkdir: no name");
 1794 #endif
 1795         dp = VTOI(dvp);
 1796         if ((nlink_t)dp->i_nlink >= LINK_MAX) {
 1797                 error = EMLINK;
 1798                 goto out;
 1799         }
 1800         dmode = vap->va_mode & 0777;
 1801         dmode |= IFDIR;
 1802         /*
 1803          * Must simulate part of ufs_makeinode here to acquire the inode,
 1804          * but not have it entered in the parent directory. The entry is
 1805          * made later after writing "." and ".." entries.
 1806          */
 1807         if (dp->i_effnlink < 2) {
 1808                 print_bad_link_count("ufs_mkdir", dvp);
 1809                 error = EINVAL;
 1810                 goto out;
 1811         }
 1812         error = UFS_VALLOC(dvp, dmode, cnp->cn_cred, &tvp);
 1813         if (error)
 1814                 goto out;
 1815         ip = VTOI(tvp);
 1816         ip->i_gid = dp->i_gid;
 1817         DIP_SET(ip, i_gid, dp->i_gid);
 1818 #ifdef SUIDDIR
 1819         {
 1820 #ifdef QUOTA
 1821                 struct ucred ucred, *ucp;
 1822                 gid_t ucred_group;
 1823                 ucp = cnp->cn_cred;
 1824 #endif
 1825                 /*
 1826                  * If we are hacking owners here, (only do this where told to)
 1827                  * and we are not giving it TO root, (would subvert quotas)
 1828                  * then go ahead and give it to the other user.
 1829                  * The new directory also inherits the SUID bit.
 1830                  * If user's UID and dir UID are the same,
 1831                  * 'give it away' so that the SUID is still forced on.
 1832                  */
 1833                 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
 1834                     (dp->i_mode & ISUID) && dp->i_uid) {
 1835                         dmode |= ISUID;
 1836                         ip->i_uid = dp->i_uid;
 1837                         DIP_SET(ip, i_uid, dp->i_uid);
 1838 #ifdef QUOTA
 1839                         if (dp->i_uid != cnp->cn_cred->cr_uid) {
 1840                                 /*
 1841                                  * Make sure the correct user gets charged
 1842                                  * for the space.
 1843                                  * Make a dummy credential for the victim.
 1844                                  * XXX This seems to never be accessed out of
 1845                                  * our context so a stack variable is ok.
 1846                                  */
 1847                                 refcount_init(&ucred.cr_ref, 1);
 1848                                 ucred.cr_uid = ip->i_uid;
 1849                                 ucred.cr_ngroups = 1;
 1850                                 ucred.cr_groups = &ucred_group;
 1851                                 ucred.cr_groups[0] = dp->i_gid;
 1852                                 ucp = &ucred;
 1853                         }
 1854 #endif
 1855                 } else {
 1856                         ip->i_uid = cnp->cn_cred->cr_uid;
 1857                         DIP_SET(ip, i_uid, ip->i_uid);
 1858                 }
 1859 #ifdef QUOTA
 1860                 if ((error = getinoquota(ip)) ||
 1861                     (error = chkiq(ip, 1, ucp, 0))) {
 1862                         if (DOINGSOFTDEP(tvp))
 1863                                 softdep_revert_link(dp, ip);
 1864                         UFS_VFREE(tvp, ip->i_number, dmode);
 1865                         vput(tvp);
 1866                         return (error);
 1867                 }
 1868 #endif
 1869         }
 1870 #else   /* !SUIDDIR */
 1871         ip->i_uid = cnp->cn_cred->cr_uid;
 1872         DIP_SET(ip, i_uid, ip->i_uid);
 1873 #ifdef QUOTA
 1874         if ((error = getinoquota(ip)) ||
 1875             (error = chkiq(ip, 1, cnp->cn_cred, 0))) {
 1876                 if (DOINGSOFTDEP(tvp))
 1877                         softdep_revert_link(dp, ip);
 1878                 UFS_VFREE(tvp, ip->i_number, dmode);
 1879                 vput(tvp);
 1880                 return (error);
 1881         }
 1882 #endif
 1883 #endif  /* !SUIDDIR */
 1884         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
 1885         ip->i_mode = dmode;
 1886         DIP_SET(ip, i_mode, dmode);
 1887         tvp->v_type = VDIR;     /* Rest init'd in getnewvnode(). */
 1888         ip->i_effnlink = 2;
 1889         ip->i_nlink = 2;
 1890         DIP_SET(ip, i_nlink, 2);
 1891 
 1892         if (cnp->cn_flags & ISWHITEOUT) {
 1893                 ip->i_flags |= UF_OPAQUE;
 1894                 DIP_SET(ip, i_flags, ip->i_flags);
 1895         }
 1896 
 1897         /*
 1898          * Bump link count in parent directory to reflect work done below.
 1899          * Should be done before reference is created so cleanup is
 1900          * possible if we crash.
 1901          */
 1902         dp->i_effnlink++;
 1903         dp->i_nlink++;
 1904         DIP_SET(dp, i_nlink, dp->i_nlink);
 1905         dp->i_flag |= IN_CHANGE;
 1906         if (DOINGSOFTDEP(dvp))
 1907                 softdep_setup_mkdir(dp, ip);
 1908         error = UFS_UPDATE(dvp, !(DOINGSOFTDEP(dvp) | DOINGASYNC(dvp)));
 1909         if (error)
 1910                 goto bad;
 1911 #ifdef MAC
 1912         if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) {
 1913                 error = mac_vnode_create_extattr(cnp->cn_cred, dvp->v_mount,
 1914                     dvp, tvp, cnp);
 1915                 if (error)
 1916                         goto bad;
 1917         }
 1918 #endif
 1919 #ifdef UFS_ACL
 1920         if (dvp->v_mount->mnt_flag & MNT_ACLS) {
 1921                 error = ufs_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
 1922                     cnp->cn_cred, cnp->cn_thread);
 1923                 if (error)
 1924                         goto bad;
 1925         } else if (dvp->v_mount->mnt_flag & MNT_NFS4ACLS) {
 1926                 error = ufs_do_nfs4_acl_inheritance(dvp, tvp, dmode,
 1927                     cnp->cn_cred, cnp->cn_thread);
 1928                 if (error)
 1929                         goto bad;
 1930         }
 1931 #endif /* !UFS_ACL */
 1932 
 1933         /*
 1934          * Initialize directory with "." and ".." from static template.
 1935          */
 1936         if (dvp->v_mount->mnt_maxsymlinklen > 0)
 1937                 dtp = &mastertemplate;
 1938         else
 1939                 dtp = (struct dirtemplate *)&omastertemplate;
 1940         dirtemplate = *dtp;
 1941         dirtemplate.dot_ino = ip->i_number;
 1942         dirtemplate.dotdot_ino = dp->i_number;
 1943         vnode_pager_setsize(tvp, DIRBLKSIZ);
 1944         if ((error = UFS_BALLOC(tvp, (off_t)0, DIRBLKSIZ, cnp->cn_cred,
 1945             BA_CLRBUF, &bp)) != 0)
 1946                 goto bad;
 1947         ip->i_size = DIRBLKSIZ;
 1948         DIP_SET(ip, i_size, DIRBLKSIZ);
 1949         ip->i_flag |= IN_CHANGE | IN_UPDATE;
 1950         bcopy((caddr_t)&dirtemplate, (caddr_t)bp->b_data, sizeof dirtemplate);
 1951         if (DOINGSOFTDEP(tvp)) {
 1952                 /*
 1953                  * Ensure that the entire newly allocated block is a
 1954                  * valid directory so that future growth within the
 1955                  * block does not have to ensure that the block is
 1956                  * written before the inode.
 1957                  */
 1958                 blkoff = DIRBLKSIZ;
 1959                 while (blkoff < bp->b_bcount) {
 1960                         ((struct direct *)
 1961                            (bp->b_data + blkoff))->d_reclen = DIRBLKSIZ;
 1962                         blkoff += DIRBLKSIZ;
 1963                 }
 1964         }
 1965         if ((error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) |
 1966                                        DOINGASYNC(tvp)))) != 0) {
 1967                 (void)bwrite(bp);
 1968                 goto bad;
 1969         }
 1970         /*
 1971          * Directory set up, now install its entry in the parent directory.
 1972          *
 1973          * If we are not doing soft dependencies, then we must write out the
 1974          * buffer containing the new directory body before entering the new 
 1975          * name in the parent. If we are doing soft dependencies, then the
 1976          * buffer containing the new directory body will be passed to and
 1977          * released in the soft dependency code after the code has attached
 1978          * an appropriate ordering dependency to the buffer which ensures that
 1979          * the buffer is written before the new name is written in the parent.
 1980          */
 1981         if (DOINGASYNC(dvp))
 1982                 bdwrite(bp);
 1983         else if (!DOINGSOFTDEP(dvp) && ((error = bwrite(bp))))
 1984                 goto bad;
 1985         ufs_makedirentry(ip, cnp, &newdir);
 1986         error = ufs_direnter(dvp, tvp, &newdir, cnp, bp, 0);
 1987         
 1988 bad:
 1989         if (error == 0) {
 1990                 *ap->a_vpp = tvp;
 1991         } else {
 1992                 dp->i_effnlink--;
 1993                 dp->i_nlink--;
 1994                 DIP_SET(dp, i_nlink, dp->i_nlink);
 1995                 dp->i_flag |= IN_CHANGE;
 1996                 /*
 1997                  * No need to do an explicit VOP_TRUNCATE here, vrele will
 1998                  * do this for us because we set the link count to 0.
 1999                  */
 2000                 ip->i_effnlink = 0;
 2001                 ip->i_nlink = 0;
 2002                 DIP_SET(ip, i_nlink, 0);
 2003                 ip->i_flag |= IN_CHANGE;
 2004                 if (DOINGSOFTDEP(tvp))
 2005                         softdep_revert_mkdir(dp, ip);
 2006 
 2007                 vput(tvp);
 2008         }
 2009 out:
 2010         return (error);
 2011 }
 2012 
 2013 /*
 2014  * Rmdir system call.
 2015  */
 2016 static int
 2017 ufs_rmdir(ap)
 2018         struct vop_rmdir_args /* {
 2019                 struct vnode *a_dvp;
 2020                 struct vnode *a_vp;
 2021                 struct componentname *a_cnp;
 2022         } */ *ap;
 2023 {
 2024         struct vnode *vp = ap->a_vp;
 2025         struct vnode *dvp = ap->a_dvp;
 2026         struct componentname *cnp = ap->a_cnp;
 2027         struct inode *ip, *dp;
 2028         int error;
 2029 
 2030         ip = VTOI(vp);
 2031         dp = VTOI(dvp);
 2032 
 2033         /*
 2034          * Do not remove a directory that is in the process of being renamed.
 2035          * Verify the directory is empty (and valid). Rmdir ".." will not be
 2036          * valid since ".." will contain a reference to the current directory
 2037          * and thus be non-empty. Do not allow the removal of mounted on
 2038          * directories (this can happen when an NFS exported filesystem
 2039          * tries to remove a locally mounted on directory).
 2040          */
 2041         error = 0;
 2042         if (dp->i_effnlink <= 2) {
 2043                 if (dp->i_effnlink == 2)
 2044                         print_bad_link_count("ufs_rmdir", dvp);
 2045                 error = EINVAL;
 2046                 goto out;
 2047         }
 2048         if (!ufs_dirempty(ip, dp->i_number, cnp->cn_cred)) {
 2049                 error = ENOTEMPTY;
 2050                 goto out;
 2051         }
 2052         if ((dp->i_flags & APPEND)
 2053             || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
 2054                 error = EPERM;
 2055                 goto out;
 2056         }
 2057         if (vp->v_mountedhere != 0) {
 2058                 error = EINVAL;
 2059                 goto out;
 2060         }
 2061 #ifdef UFS_GJOURNAL
 2062         ufs_gjournal_orphan(vp);
 2063 #endif
 2064         /*
 2065          * Delete reference to directory before purging
 2066          * inode.  If we crash in between, the directory
 2067          * will be reattached to lost+found,
 2068          */
 2069         dp->i_effnlink--;
 2070         ip->i_effnlink--;
 2071         if (DOINGSOFTDEP(vp))
 2072                 softdep_setup_rmdir(dp, ip);
 2073         error = ufs_dirremove(dvp, ip, cnp->cn_flags, 1);
 2074         if (error) {
 2075                 dp->i_effnlink++;
 2076                 ip->i_effnlink++;
 2077                 if (DOINGSOFTDEP(vp))
 2078                         softdep_revert_rmdir(dp, ip);
 2079                 goto out;
 2080         }
 2081         cache_purge(dvp);
 2082         /*
 2083          * The only stuff left in the directory is "." and "..". The "."
 2084          * reference is inconsequential since we are quashing it. The soft
 2085          * dependency code will arrange to do these operations after
 2086          * the parent directory entry has been deleted on disk, so
 2087          * when running with that code we avoid doing them now.
 2088          */
 2089         if (!DOINGSOFTDEP(vp)) {
 2090                 dp->i_nlink--;
 2091                 DIP_SET(dp, i_nlink, dp->i_nlink);
 2092                 dp->i_flag |= IN_CHANGE;
 2093                 error = UFS_UPDATE(dvp, 0);
 2094                 ip->i_nlink--;
 2095                 DIP_SET(ip, i_nlink, ip->i_nlink);
 2096                 ip->i_flag |= IN_CHANGE;
 2097         }
 2098         cache_purge(vp);
 2099 #ifdef UFS_DIRHASH
 2100         /* Kill any active hash; i_effnlink == 0, so it will not come back. */
 2101         if (ip->i_dirhash != NULL)
 2102                 ufsdirhash_free(ip);
 2103 #endif
 2104 out:
 2105         return (error);
 2106 }
 2107 
 2108 /*
 2109  * symlink -- make a symbolic link
 2110  */
 2111 static int
 2112 ufs_symlink(ap)
 2113         struct vop_symlink_args /* {
 2114                 struct vnode *a_dvp;
 2115                 struct vnode **a_vpp;
 2116                 struct componentname *a_cnp;
 2117                 struct vattr *a_vap;
 2118                 char *a_target;
 2119         } */ *ap;
 2120 {
 2121         struct vnode *vp, **vpp = ap->a_vpp;
 2122         struct inode *ip;
 2123         int len, error;
 2124 
 2125         error = ufs_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
 2126             vpp, ap->a_cnp, "ufs_symlink");
 2127         if (error)
 2128                 return (error);
 2129         vp = *vpp;
 2130         len = strlen(ap->a_target);
 2131         if (len < vp->v_mount->mnt_maxsymlinklen) {
 2132                 ip = VTOI(vp);
 2133                 bcopy(ap->a_target, SHORTLINK(ip), len);
 2134                 ip->i_size = len;
 2135                 DIP_SET(ip, i_size, len);
 2136                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
 2137                 error = UFS_UPDATE(vp, 0);
 2138         } else
 2139                 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
 2140                     UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
 2141                     ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
 2142         if (error)
 2143                 vput(vp);
 2144         return (error);
 2145 }
 2146 
 2147 /*
 2148  * Vnode op for reading directories.
 2149  */
 2150 int
 2151 ufs_readdir(ap)
 2152         struct vop_readdir_args /* {
 2153                 struct vnode *a_vp;
 2154                 struct uio *a_uio;
 2155                 struct ucred *a_cred;
 2156                 int *a_eofflag;
 2157                 int *a_ncookies;
 2158                 u_long **a_cookies;
 2159         } */ *ap;
 2160 {
 2161         struct vnode *vp = ap->a_vp;
 2162         struct uio *uio = ap->a_uio;
 2163         struct buf *bp;
 2164         struct inode *ip;
 2165         struct direct *dp, *edp;
 2166         u_long *cookies;
 2167         struct dirent dstdp;
 2168         off_t offset, startoffset;
 2169         size_t readcnt, skipcnt;
 2170         ssize_t startresid;
 2171         int ncookies;
 2172         int error;
 2173 
 2174         if (uio->uio_offset < 0)
 2175                 return (EINVAL);
 2176         ip = VTOI(vp);
 2177         if (ip->i_effnlink == 0)
 2178                 return (0);
 2179         if (ap->a_ncookies != NULL) {
 2180                 if (uio->uio_resid < 0)
 2181                         ncookies = 0;
 2182                 else
 2183                         ncookies = uio->uio_resid;
 2184                 if (uio->uio_offset >= ip->i_size)
 2185                         ncookies = 0;
 2186                 else if (ip->i_size - uio->uio_offset < ncookies)
 2187                         ncookies = ip->i_size - uio->uio_offset;
 2188                 ncookies = ncookies / (offsetof(struct direct, d_name) + 4) + 1;
 2189                 cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK);
 2190                 *ap->a_ncookies = ncookies;
 2191                 *ap->a_cookies = cookies;
 2192         } else {
 2193                 ncookies = 0;
 2194                 cookies = NULL;
 2195         }
 2196         offset = startoffset = uio->uio_offset;
 2197         startresid = uio->uio_resid;
 2198         error = 0;
 2199         while (error == 0 && uio->uio_resid > 0 &&
 2200             uio->uio_offset < ip->i_size) {
 2201                 error = ffs_blkatoff(vp, uio->uio_offset, NULL, &bp);
 2202                 if (error)
 2203                         break;
 2204                 if (bp->b_offset + bp->b_bcount > ip->i_size)
 2205                         readcnt = ip->i_size - bp->b_offset;
 2206                 else
 2207                         readcnt = bp->b_bcount;
 2208                 skipcnt = (size_t)(uio->uio_offset - bp->b_offset) &
 2209                     ~(size_t)(DIRBLKSIZ - 1);
 2210                 offset = bp->b_offset + skipcnt;
 2211                 dp = (struct direct *)&bp->b_data[skipcnt];
 2212                 edp = (struct direct *)&bp->b_data[readcnt];
 2213                 while (error == 0 && uio->uio_resid > 0 && dp < edp) {
 2214                         if (dp->d_reclen <= offsetof(struct direct, d_name) ||
 2215                             (caddr_t)dp + dp->d_reclen > (caddr_t)edp) {
 2216                                 error = EIO;
 2217                                 break;
 2218                         }
 2219 #if BYTE_ORDER == LITTLE_ENDIAN
 2220                         /* Old filesystem format. */
 2221                         if (vp->v_mount->mnt_maxsymlinklen <= 0) {
 2222                                 dstdp.d_namlen = dp->d_type;
 2223                                 dstdp.d_type = dp->d_namlen;
 2224                         } else
 2225 #endif
 2226                         {
 2227                                 dstdp.d_namlen = dp->d_namlen;
 2228                                 dstdp.d_type = dp->d_type;
 2229                         }
 2230                         if (offsetof(struct direct, d_name) + dstdp.d_namlen >
 2231                             dp->d_reclen) {
 2232                                 error = EIO;
 2233                                 break;
 2234                         }
 2235                         if (offset < startoffset || dp->d_ino == 0)
 2236                                 goto nextentry;
 2237                         dstdp.d_fileno = dp->d_ino;
 2238                         dstdp.d_reclen = GENERIC_DIRSIZ(&dstdp);
 2239                         bcopy(dp->d_name, dstdp.d_name, dstdp.d_namlen);
 2240                         dstdp.d_name[dstdp.d_namlen] = '\0';
 2241                         if (dstdp.d_reclen > uio->uio_resid) {
 2242                                 if (uio->uio_resid == startresid)
 2243                                         error = EINVAL;
 2244                                 else
 2245                                         error = EJUSTRETURN;
 2246                                 break;
 2247                         }
 2248                         /* Advance dp. */
 2249                         error = uiomove((caddr_t)&dstdp, dstdp.d_reclen, uio);
 2250                         if (error)
 2251                                 break;
 2252                         if (cookies != NULL) {
 2253                                 KASSERT(ncookies > 0,
 2254                                     ("ufs_readdir: cookies buffer too small"));
 2255                                 *cookies = offset + dp->d_reclen;
 2256                                 cookies++;
 2257                                 ncookies--;
 2258                         }
 2259 nextentry:
 2260                         offset += dp->d_reclen;
 2261                         dp = (struct direct *)((caddr_t)dp + dp->d_reclen);
 2262                 }
 2263                 bqrelse(bp);
 2264                 uio->uio_offset = offset;
 2265         }
 2266         /* We need to correct uio_offset. */
 2267         uio->uio_offset = offset;
 2268         if (error == EJUSTRETURN)
 2269                 error = 0;
 2270         if (ap->a_ncookies != NULL) {
 2271                 if (error == 0) {
 2272                         ap->a_ncookies -= ncookies;
 2273                 } else {
 2274                         free(*ap->a_cookies, M_TEMP);
 2275                         *ap->a_ncookies = 0;
 2276                         *ap->a_cookies = NULL;
 2277                 }
 2278         }
 2279         if (error == 0 && ap->a_eofflag)
 2280                 *ap->a_eofflag = ip->i_size <= uio->uio_offset;
 2281         return (error);
 2282 }
 2283 
 2284 /*
 2285  * Return target name of a symbolic link
 2286  */
 2287 static int
 2288 ufs_readlink(ap)
 2289         struct vop_readlink_args /* {
 2290                 struct vnode *a_vp;
 2291                 struct uio *a_uio;
 2292                 struct ucred *a_cred;
 2293         } */ *ap;
 2294 {
 2295         struct vnode *vp = ap->a_vp;
 2296         struct inode *ip = VTOI(vp);
 2297         doff_t isize;
 2298 
 2299         isize = ip->i_size;
 2300         if ((isize < vp->v_mount->mnt_maxsymlinklen) ||
 2301             DIP(ip, i_blocks) == 0) { /* XXX - for old fastlink support */
 2302                 return (uiomove(SHORTLINK(ip), isize, ap->a_uio));
 2303         }
 2304         return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
 2305 }
 2306 
 2307 /*
 2308  * Calculate the logical to physical mapping if not done already,
 2309  * then call the device strategy routine.
 2310  *
 2311  * In order to be able to swap to a file, the ufs_bmaparray() operation may not
 2312  * deadlock on memory.  See ufs_bmap() for details.
 2313  */
 2314 static int
 2315 ufs_strategy(ap)
 2316         struct vop_strategy_args /* {
 2317                 struct vnode *a_vp;
 2318                 struct buf *a_bp;
 2319         } */ *ap;
 2320 {
 2321         struct buf *bp = ap->a_bp;
 2322         struct vnode *vp = ap->a_vp;
 2323         ufs2_daddr_t blkno;
 2324         int error;
 2325 
 2326         if (bp->b_blkno == bp->b_lblkno) {
 2327                 error = ufs_bmaparray(vp, bp->b_lblkno, &blkno, bp, NULL, NULL);
 2328                 bp->b_blkno = blkno;
 2329                 if (error) {
 2330                         bp->b_error = error;
 2331                         bp->b_ioflags |= BIO_ERROR;
 2332                         bufdone(bp);
 2333                         return (0);
 2334                 }
 2335                 if ((long)bp->b_blkno == -1)
 2336                         vfs_bio_clrbuf(bp);
 2337         }
 2338         if ((long)bp->b_blkno == -1) {
 2339                 bufdone(bp);
 2340                 return (0);
 2341         }
 2342         bp->b_iooffset = dbtob(bp->b_blkno);
 2343         BO_STRATEGY(VFSTOUFS(vp->v_mount)->um_bo, bp);
 2344         return (0);
 2345 }
 2346 
 2347 /*
 2348  * Print out the contents of an inode.
 2349  */
 2350 static int
 2351 ufs_print(ap)
 2352         struct vop_print_args /* {
 2353                 struct vnode *a_vp;
 2354         } */ *ap;
 2355 {
 2356         struct vnode *vp = ap->a_vp;
 2357         struct inode *ip = VTOI(vp);
 2358 
 2359         printf("\tino %lu, on dev %s", (u_long)ip->i_number,
 2360             devtoname(ITODEV(ip)));
 2361         if (vp->v_type == VFIFO)
 2362                 fifo_printinfo(vp);
 2363         printf("\n");
 2364         return (0);
 2365 }
 2366 
 2367 /*
 2368  * Close wrapper for fifos.
 2369  *
 2370  * Update the times on the inode then do device close.
 2371  */
 2372 static int
 2373 ufsfifo_close(ap)
 2374         struct vop_close_args /* {
 2375                 struct vnode *a_vp;
 2376                 int  a_fflag;
 2377                 struct ucred *a_cred;
 2378                 struct thread *a_td;
 2379         } */ *ap;
 2380 {
 2381         struct vnode *vp = ap->a_vp;
 2382         int usecount;
 2383 
 2384         VI_LOCK(vp);
 2385         usecount = vp->v_usecount;
 2386         if (usecount > 1)
 2387                 ufs_itimes_locked(vp);
 2388         VI_UNLOCK(vp);
 2389         return (fifo_specops.vop_close(ap));
 2390 }
 2391 
 2392 /*
 2393  * Kqfilter wrapper for fifos.
 2394  *
 2395  * Fall through to ufs kqfilter routines if needed 
 2396  */
 2397 static int
 2398 ufsfifo_kqfilter(ap)
 2399         struct vop_kqfilter_args *ap;
 2400 {
 2401         int error;
 2402 
 2403         error = fifo_specops.vop_kqfilter(ap);
 2404         if (error)
 2405                 error = vfs_kqfilter(ap);
 2406         return (error);
 2407 }
 2408 
 2409 /*
 2410  * Return POSIX pathconf information applicable to ufs filesystems.
 2411  */
 2412 static int
 2413 ufs_pathconf(ap)
 2414         struct vop_pathconf_args /* {
 2415                 struct vnode *a_vp;
 2416                 int a_name;
 2417                 int *a_retval;
 2418         } */ *ap;
 2419 {
 2420         int error;
 2421 
 2422         error = 0;
 2423         switch (ap->a_name) {
 2424         case _PC_NAME_MAX:
 2425                 *ap->a_retval = NAME_MAX;
 2426                 break;
 2427         case _PC_PIPE_BUF:
 2428                 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
 2429                         *ap->a_retval = PIPE_BUF;
 2430                 else
 2431                         error = EINVAL;
 2432                 break;
 2433         case _PC_CHOWN_RESTRICTED:
 2434                 *ap->a_retval = 1;
 2435                 break;
 2436         case _PC_NO_TRUNC:
 2437                 *ap->a_retval = 1;
 2438                 break;
 2439         case _PC_ACL_EXTENDED:
 2440 #ifdef UFS_ACL
 2441                 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
 2442                         *ap->a_retval = 1;
 2443                 else
 2444                         *ap->a_retval = 0;
 2445 #else
 2446                 *ap->a_retval = 0;
 2447 #endif
 2448                 break;
 2449 
 2450         case _PC_ACL_NFS4:
 2451 #ifdef UFS_ACL
 2452                 if (ap->a_vp->v_mount->mnt_flag & MNT_NFS4ACLS)
 2453                         *ap->a_retval = 1;
 2454                 else
 2455                         *ap->a_retval = 0;
 2456 #else
 2457                 *ap->a_retval = 0;
 2458 #endif
 2459                 break;
 2460 
 2461         case _PC_ACL_PATH_MAX:
 2462 #ifdef UFS_ACL
 2463                 if (ap->a_vp->v_mount->mnt_flag & (MNT_ACLS | MNT_NFS4ACLS))
 2464                         *ap->a_retval = ACL_MAX_ENTRIES;
 2465                 else
 2466                         *ap->a_retval = 3;
 2467 #else
 2468                 *ap->a_retval = 3;
 2469 #endif
 2470                 break;
 2471         case _PC_MAC_PRESENT:
 2472 #ifdef MAC
 2473                 if (ap->a_vp->v_mount->mnt_flag & MNT_MULTILABEL)
 2474                         *ap->a_retval = 1;
 2475                 else
 2476                         *ap->a_retval = 0;
 2477 #else
 2478                 *ap->a_retval = 0;
 2479 #endif
 2480                 break;
 2481         case _PC_MIN_HOLE_SIZE:
 2482                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 2483                 break;
 2484         case _PC_PRIO_IO:
 2485                 *ap->a_retval = 0;
 2486                 break;
 2487         case _PC_SYNC_IO:
 2488                 *ap->a_retval = 0;
 2489                 break;
 2490         case _PC_ALLOC_SIZE_MIN:
 2491                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
 2492                 break;
 2493         case _PC_FILESIZEBITS:
 2494                 *ap->a_retval = 64;
 2495                 break;
 2496         case _PC_REC_INCR_XFER_SIZE:
 2497                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 2498                 break;
 2499         case _PC_REC_MAX_XFER_SIZE:
 2500                 *ap->a_retval = -1; /* means ``unlimited'' */
 2501                 break;
 2502         case _PC_REC_MIN_XFER_SIZE:
 2503                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 2504                 break;
 2505         case _PC_REC_XFER_ALIGN:
 2506                 *ap->a_retval = PAGE_SIZE;
 2507                 break;
 2508         case _PC_SYMLINK_MAX:
 2509                 *ap->a_retval = MAXPATHLEN;
 2510                 break;
 2511 
 2512         default:
 2513                 error = vop_stdpathconf(ap);
 2514                 break;
 2515         }
 2516         return (error);
 2517 }
 2518 
 2519 /*
 2520  * Initialize the vnode associated with a new inode, handle aliased
 2521  * vnodes.
 2522  */
 2523 int
 2524 ufs_vinit(mntp, fifoops, vpp)
 2525         struct mount *mntp;
 2526         struct vop_vector *fifoops;
 2527         struct vnode **vpp;
 2528 {
 2529         struct inode *ip;
 2530         struct vnode *vp;
 2531 
 2532         vp = *vpp;
 2533         ip = VTOI(vp);
 2534         vp->v_type = IFTOVT(ip->i_mode);
 2535         if (vp->v_type == VFIFO)
 2536                 vp->v_op = fifoops;
 2537         ASSERT_VOP_LOCKED(vp, "ufs_vinit");
 2538         if (ip->i_number == ROOTINO)
 2539                 vp->v_vflag |= VV_ROOT;
 2540         *vpp = vp;
 2541         return (0);
 2542 }
 2543 
 2544 /*
 2545  * Allocate a new inode.
 2546  * Vnode dvp must be locked.
 2547  */
 2548 static int
 2549 ufs_makeinode(mode, dvp, vpp, cnp, callfunc)
 2550         int mode;
 2551         struct vnode *dvp;
 2552         struct vnode **vpp;
 2553         struct componentname *cnp;
 2554         const char *callfunc;
 2555 {
 2556         struct inode *ip, *pdir;
 2557         struct direct newdir;
 2558         struct vnode *tvp;
 2559         int error;
 2560 
 2561         pdir = VTOI(dvp);
 2562 #ifdef INVARIANTS
 2563         if ((cnp->cn_flags & HASBUF) == 0)
 2564                 panic("%s: no name", callfunc);
 2565 #endif
 2566         *vpp = NULL;
 2567         if ((mode & IFMT) == 0)
 2568                 mode |= IFREG;
 2569 
 2570         if (pdir->i_effnlink < 2) {
 2571                 print_bad_link_count(callfunc, dvp);
 2572                 return (EINVAL);
 2573         }
 2574         error = UFS_VALLOC(dvp, mode, cnp->cn_cred, &tvp);
 2575         if (error)
 2576                 return (error);
 2577         ip = VTOI(tvp);
 2578         ip->i_gid = pdir->i_gid;
 2579         DIP_SET(ip, i_gid, pdir->i_gid);
 2580 #ifdef SUIDDIR
 2581         {
 2582 #ifdef QUOTA
 2583                 struct ucred ucred, *ucp;
 2584                 gid_t ucred_group;
 2585                 ucp = cnp->cn_cred;
 2586 #endif
 2587                 /*
 2588                  * If we are not the owner of the directory,
 2589                  * and we are hacking owners here, (only do this where told to)
 2590                  * and we are not giving it TO root, (would subvert quotas)
 2591                  * then go ahead and give it to the other user.
 2592                  * Note that this drops off the execute bits for security.
 2593                  */
 2594                 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
 2595                     (pdir->i_mode & ISUID) &&
 2596                     (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
 2597                         ip->i_uid = pdir->i_uid;
 2598                         DIP_SET(ip, i_uid, ip->i_uid);
 2599                         mode &= ~07111;
 2600 #ifdef QUOTA
 2601                         /*
 2602                          * Make sure the correct user gets charged
 2603                          * for the space.
 2604                          * Quickly knock up a dummy credential for the victim.
 2605                          * XXX This seems to never be accessed out of our
 2606                          * context so a stack variable is ok.
 2607                          */
 2608                         refcount_init(&ucred.cr_ref, 1);
 2609                         ucred.cr_uid = ip->i_uid;
 2610                         ucred.cr_ngroups = 1;
 2611                         ucred.cr_groups = &ucred_group;
 2612                         ucred.cr_groups[0] = pdir->i_gid;
 2613                         ucp = &ucred;
 2614 #endif
 2615                 } else {
 2616                         ip->i_uid = cnp->cn_cred->cr_uid;
 2617                         DIP_SET(ip, i_uid, ip->i_uid);
 2618                 }
 2619 
 2620 #ifdef QUOTA
 2621                 if ((error = getinoquota(ip)) ||
 2622                     (error = chkiq(ip, 1, ucp, 0))) {
 2623                         if (DOINGSOFTDEP(tvp))
 2624                                 softdep_revert_link(pdir, ip);
 2625                         UFS_VFREE(tvp, ip->i_number, mode);
 2626                         vput(tvp);
 2627                         return (error);
 2628                 }
 2629 #endif
 2630         }
 2631 #else   /* !SUIDDIR */
 2632         ip->i_uid = cnp->cn_cred->cr_uid;
 2633         DIP_SET(ip, i_uid, ip->i_uid);
 2634 #ifdef QUOTA
 2635         if ((error = getinoquota(ip)) ||
 2636             (error = chkiq(ip, 1, cnp->cn_cred, 0))) {
 2637                 if (DOINGSOFTDEP(tvp))
 2638                         softdep_revert_link(pdir, ip);
 2639                 UFS_VFREE(tvp, ip->i_number, mode);
 2640                 vput(tvp);
 2641                 return (error);
 2642         }
 2643 #endif
 2644 #endif  /* !SUIDDIR */
 2645         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
 2646         ip->i_mode = mode;
 2647         DIP_SET(ip, i_mode, mode);
 2648         tvp->v_type = IFTOVT(mode);     /* Rest init'd in getnewvnode(). */
 2649         ip->i_effnlink = 1;
 2650         ip->i_nlink = 1;
 2651         DIP_SET(ip, i_nlink, 1);
 2652         if (DOINGSOFTDEP(tvp))
 2653                 softdep_setup_create(VTOI(dvp), ip);
 2654         if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred) &&
 2655             priv_check_cred(cnp->cn_cred, PRIV_VFS_SETGID, 0)) {
 2656                 ip->i_mode &= ~ISGID;
 2657                 DIP_SET(ip, i_mode, ip->i_mode);
 2658         }
 2659 
 2660         if (cnp->cn_flags & ISWHITEOUT) {
 2661                 ip->i_flags |= UF_OPAQUE;
 2662                 DIP_SET(ip, i_flags, ip->i_flags);
 2663         }
 2664 
 2665         /*
 2666          * Make sure inode goes to disk before directory entry.
 2667          */
 2668         error = UFS_UPDATE(tvp, !(DOINGSOFTDEP(tvp) | DOINGASYNC(tvp)));
 2669         if (error)
 2670                 goto bad;
 2671 #ifdef MAC
 2672         if (dvp->v_mount->mnt_flag & MNT_MULTILABEL) {
 2673                 error = mac_vnode_create_extattr(cnp->cn_cred, dvp->v_mount,
 2674                     dvp, tvp, cnp);
 2675                 if (error)
 2676                         goto bad;
 2677         }
 2678 #endif
 2679 #ifdef UFS_ACL
 2680         if (dvp->v_mount->mnt_flag & MNT_ACLS) {
 2681                 error = ufs_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
 2682                     cnp->cn_cred, cnp->cn_thread);
 2683                 if (error)
 2684                         goto bad;
 2685         } else if (dvp->v_mount->mnt_flag & MNT_NFS4ACLS) {
 2686                 error = ufs_do_nfs4_acl_inheritance(dvp, tvp, mode,
 2687                     cnp->cn_cred, cnp->cn_thread);
 2688                 if (error)
 2689                         goto bad;
 2690         }
 2691 #endif /* !UFS_ACL */
 2692         ufs_makedirentry(ip, cnp, &newdir);
 2693         error = ufs_direnter(dvp, tvp, &newdir, cnp, NULL, 0);
 2694         if (error)
 2695                 goto bad;
 2696         *vpp = tvp;
 2697         return (0);
 2698 
 2699 bad:
 2700         /*
 2701          * Write error occurred trying to update the inode
 2702          * or the directory so must deallocate the inode.
 2703          */
 2704         ip->i_effnlink = 0;
 2705         ip->i_nlink = 0;
 2706         DIP_SET(ip, i_nlink, 0);
 2707         ip->i_flag |= IN_CHANGE;
 2708         if (DOINGSOFTDEP(tvp))
 2709                 softdep_revert_create(VTOI(dvp), ip);
 2710         vput(tvp);
 2711         return (error);
 2712 }
 2713 
 2714 static int
 2715 ufs_ioctl(struct vop_ioctl_args *ap)
 2716 {
 2717 
 2718         switch (ap->a_command) {
 2719         case FIOSEEKDATA:
 2720         case FIOSEEKHOLE:
 2721                 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
 2722                     (off_t *)ap->a_data, ap->a_cred));
 2723         default:
 2724                 return (ENOTTY);
 2725         }
 2726 }
 2727 
 2728 /* Global vfs data structures for ufs. */
 2729 struct vop_vector ufs_vnodeops = {
 2730         .vop_default =          &default_vnodeops,
 2731         .vop_fsync =            VOP_PANIC,
 2732         .vop_read =             VOP_PANIC,
 2733         .vop_reallocblks =      VOP_PANIC,
 2734         .vop_write =            VOP_PANIC,
 2735         .vop_accessx =          ufs_accessx,
 2736         .vop_bmap =             ufs_bmap,
 2737         .vop_cachedlookup =     ufs_lookup,
 2738         .vop_close =            ufs_close,
 2739         .vop_create =           ufs_create,
 2740         .vop_getattr =          ufs_getattr,
 2741         .vop_inactive =         ufs_inactive,
 2742         .vop_ioctl =            ufs_ioctl,
 2743         .vop_link =             ufs_link,
 2744         .vop_lookup =           vfs_cache_lookup,
 2745         .vop_markatime =        ufs_markatime,
 2746         .vop_mkdir =            ufs_mkdir,
 2747         .vop_mknod =            ufs_mknod,
 2748         .vop_open =             ufs_open,
 2749         .vop_pathconf =         ufs_pathconf,
 2750         .vop_poll =             vop_stdpoll,
 2751         .vop_print =            ufs_print,
 2752         .vop_readdir =          ufs_readdir,
 2753         .vop_readlink =         ufs_readlink,
 2754         .vop_reclaim =          ufs_reclaim,
 2755         .vop_remove =           ufs_remove,
 2756         .vop_rename =           ufs_rename,
 2757         .vop_rmdir =            ufs_rmdir,
 2758         .vop_setattr =          ufs_setattr,
 2759 #ifdef MAC
 2760         .vop_setlabel =         vop_stdsetlabel_ea,
 2761 #endif
 2762         .vop_strategy =         ufs_strategy,
 2763         .vop_symlink =          ufs_symlink,
 2764         .vop_whiteout =         ufs_whiteout,
 2765 #ifdef UFS_EXTATTR
 2766         .vop_getextattr =       ufs_getextattr,
 2767         .vop_deleteextattr =    ufs_deleteextattr,
 2768         .vop_setextattr =       ufs_setextattr,
 2769 #endif
 2770 #ifdef UFS_ACL
 2771         .vop_getacl =           ufs_getacl,
 2772         .vop_setacl =           ufs_setacl,
 2773         .vop_aclcheck =         ufs_aclcheck,
 2774 #endif
 2775 };
 2776 
 2777 struct vop_vector ufs_fifoops = {
 2778         .vop_default =          &fifo_specops,
 2779         .vop_fsync =            VOP_PANIC,
 2780         .vop_accessx =          ufs_accessx,
 2781         .vop_close =            ufsfifo_close,
 2782         .vop_getattr =          ufs_getattr,
 2783         .vop_inactive =         ufs_inactive,
 2784         .vop_kqfilter =         ufsfifo_kqfilter,
 2785         .vop_markatime =        ufs_markatime,
 2786         .vop_pathconf =         ufs_pathconf,
 2787         .vop_print =            ufs_print,
 2788         .vop_read =             VOP_PANIC,
 2789         .vop_reclaim =          ufs_reclaim,
 2790         .vop_setattr =          ufs_setattr,
 2791 #ifdef MAC
 2792         .vop_setlabel =         vop_stdsetlabel_ea,
 2793 #endif
 2794         .vop_write =            VOP_PANIC,
 2795 #ifdef UFS_EXTATTR
 2796         .vop_getextattr =       ufs_getextattr,
 2797         .vop_deleteextattr =    ufs_deleteextattr,
 2798         .vop_setextattr =       ufs_setextattr,
 2799 #endif
 2800 #ifdef UFS_ACL
 2801         .vop_getacl =           ufs_getacl,
 2802         .vop_setacl =           ufs_setacl,
 2803         .vop_aclcheck =         ufs_aclcheck,
 2804 #endif
 2805 };

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