The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/ext2fs/ext2_vnops.c

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    1 /*-
    2  *  modified for EXT2FS support in Lites 1.1
    3  *
    4  *  Aug 1995, Godmar Back (gback@cs.utah.edu)
    5  *  University of Utah, Department of Computer Science
    6  */
    7 /*-
    8  * SPDX-License-Identifier: BSD-3-Clause
    9  *
   10  * Copyright (c) 1982, 1986, 1989, 1993
   11  *      The Regents of the University of California.  All rights reserved.
   12  * (c) UNIX System Laboratories, Inc.
   13  * All or some portions of this file are derived from material licensed
   14  * to the University of California by American Telephone and Telegraph
   15  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   16  * the permission of UNIX System Laboratories, Inc.
   17  *
   18  * Redistribution and use in source and binary forms, with or without
   19  * modification, are permitted provided that the following conditions
   20  * are met:
   21  * 1. Redistributions of source code must retain the above copyright
   22  *    notice, this list of conditions and the following disclaimer.
   23  * 2. Redistributions in binary form must reproduce the above copyright
   24  *    notice, this list of conditions and the following disclaimer in the
   25  *    documentation and/or other materials provided with the distribution.
   26  * 3. Neither the name of the University nor the names of its contributors
   27  *    may be used to endorse or promote products derived from this software
   28  *    without specific prior written permission.
   29  *
   30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   40  * SUCH DAMAGE.
   41  *
   42  *      @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94
   43  *      @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
   44  * $FreeBSD$
   45  */
   46 
   47 #include "opt_suiddir.h"
   48 
   49 #include <sys/param.h>
   50 #include <sys/systm.h>
   51 #include <sys/kernel.h>
   52 #include <sys/fcntl.h>
   53 #include <sys/filio.h>
   54 #include <sys/limits.h>
   55 #include <sys/sdt.h>
   56 #include <sys/stat.h>
   57 #include <sys/bio.h>
   58 #include <sys/buf.h>
   59 #include <sys/endian.h>
   60 #include <sys/priv.h>
   61 #include <sys/rwlock.h>
   62 #include <sys/mount.h>
   63 #include <sys/unistd.h>
   64 #include <sys/time.h>
   65 #include <sys/vnode.h>
   66 #include <sys/namei.h>
   67 #include <sys/lockf.h>
   68 #include <sys/event.h>
   69 #include <sys/conf.h>
   70 #include <sys/file.h>
   71 #include <sys/extattr.h>
   72 #include <sys/vmmeter.h>
   73 
   74 #include <vm/vm.h>
   75 #include <vm/vm_param.h>
   76 #include <vm/vm_extern.h>
   77 #include <vm/vm_object.h>
   78 #include <vm/vm_page.h>
   79 #include <vm/vm_pager.h>
   80 #include <vm/vnode_pager.h>
   81 
   82 #include "opt_directio.h"
   83 
   84 #include <ufs/ufs/dir.h>
   85 
   86 #include <fs/ext2fs/fs.h>
   87 #include <fs/ext2fs/inode.h>
   88 #include <fs/ext2fs/ext2_acl.h>
   89 #include <fs/ext2fs/ext2fs.h>
   90 #include <fs/ext2fs/ext2_extern.h>
   91 #include <fs/ext2fs/ext2_dinode.h>
   92 #include <fs/ext2fs/ext2_dir.h>
   93 #include <fs/ext2fs/ext2_mount.h>
   94 #include <fs/ext2fs/ext2_extattr.h>
   95 #include <fs/ext2fs/ext2_extents.h>
   96 
   97 SDT_PROVIDER_DECLARE(ext2fs);
   98 /*
   99  * ext2fs trace probe:
  100  * arg0: verbosity. Higher numbers give more verbose messages
  101  * arg1: Textual message
  102  */
  103 SDT_PROBE_DEFINE2(ext2fs, , vnops, trace, "int", "char*");
  104 
  105 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
  106 static void ext2_itimes_locked(struct vnode *);
  107 
  108 static vop_access_t     ext2_access;
  109 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
  110 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
  111     struct thread *);
  112 static vop_close_t      ext2_close;
  113 static vop_create_t     ext2_create;
  114 static vop_fsync_t      ext2_fsync;
  115 static vop_getattr_t    ext2_getattr;
  116 static vop_ioctl_t      ext2_ioctl;
  117 static vop_link_t       ext2_link;
  118 static vop_mkdir_t      ext2_mkdir;
  119 static vop_mknod_t      ext2_mknod;
  120 static vop_open_t       ext2_open;
  121 static vop_pathconf_t   ext2_pathconf;
  122 static vop_print_t      ext2_print;
  123 static vop_read_t       ext2_read;
  124 static vop_readlink_t   ext2_readlink;
  125 static vop_remove_t     ext2_remove;
  126 static vop_rename_t     ext2_rename;
  127 static vop_rmdir_t      ext2_rmdir;
  128 static vop_setattr_t    ext2_setattr;
  129 static vop_strategy_t   ext2_strategy;
  130 static vop_symlink_t    ext2_symlink;
  131 static vop_write_t      ext2_write;
  132 static vop_deleteextattr_t      ext2_deleteextattr;
  133 static vop_getextattr_t ext2_getextattr;
  134 static vop_listextattr_t        ext2_listextattr;
  135 static vop_setextattr_t ext2_setextattr;
  136 static vop_vptofh_t     ext2_vptofh;
  137 static vop_close_t      ext2fifo_close;
  138 static vop_kqfilter_t   ext2fifo_kqfilter;
  139 
  140 /* Global vfs data structures for ext2. */
  141 struct vop_vector ext2_vnodeops = {
  142         .vop_default =          &default_vnodeops,
  143         .vop_access =           ext2_access,
  144         .vop_bmap =             ext2_bmap,
  145         .vop_cachedlookup =     ext2_lookup,
  146         .vop_close =            ext2_close,
  147         .vop_create =           ext2_create,
  148         .vop_fsync =            ext2_fsync,
  149         .vop_getpages =         vnode_pager_local_getpages,
  150         .vop_getpages_async =   vnode_pager_local_getpages_async,
  151         .vop_getattr =          ext2_getattr,
  152         .vop_inactive =         ext2_inactive,
  153         .vop_ioctl =            ext2_ioctl,
  154         .vop_link =             ext2_link,
  155         .vop_lookup =           vfs_cache_lookup,
  156         .vop_mkdir =            ext2_mkdir,
  157         .vop_mknod =            ext2_mknod,
  158         .vop_open =             ext2_open,
  159         .vop_pathconf =         ext2_pathconf,
  160         .vop_poll =             vop_stdpoll,
  161         .vop_print =            ext2_print,
  162         .vop_read =             ext2_read,
  163         .vop_readdir =          ext2_readdir,
  164         .vop_readlink =         ext2_readlink,
  165         .vop_reallocblks =      ext2_reallocblks,
  166         .vop_reclaim =          ext2_reclaim,
  167         .vop_remove =           ext2_remove,
  168         .vop_rename =           ext2_rename,
  169         .vop_rmdir =            ext2_rmdir,
  170         .vop_setattr =          ext2_setattr,
  171         .vop_strategy =         ext2_strategy,
  172         .vop_symlink =          ext2_symlink,
  173         .vop_write =            ext2_write,
  174         .vop_deleteextattr =    ext2_deleteextattr,
  175         .vop_getextattr =       ext2_getextattr,
  176         .vop_listextattr =      ext2_listextattr,
  177         .vop_setextattr =       ext2_setextattr,
  178 #ifdef UFS_ACL
  179         .vop_getacl =           ext2_getacl,
  180         .vop_setacl =           ext2_setacl,
  181         .vop_aclcheck =         ext2_aclcheck,
  182 #endif /* UFS_ACL */
  183         .vop_vptofh =           ext2_vptofh,
  184 };
  185 VFS_VOP_VECTOR_REGISTER(ext2_vnodeops);
  186 
  187 struct vop_vector ext2_fifoops = {
  188         .vop_default =          &fifo_specops,
  189         .vop_access =           ext2_access,
  190         .vop_close =            ext2fifo_close,
  191         .vop_fsync =            ext2_fsync,
  192         .vop_getattr =          ext2_getattr,
  193         .vop_inactive =         ext2_inactive,
  194         .vop_kqfilter =         ext2fifo_kqfilter,
  195         .vop_pathconf =         ext2_pathconf,
  196         .vop_print =            ext2_print,
  197         .vop_read =             VOP_PANIC,
  198         .vop_reclaim =          ext2_reclaim,
  199         .vop_setattr =          ext2_setattr,
  200         .vop_write =            VOP_PANIC,
  201         .vop_vptofh =           ext2_vptofh,
  202 };
  203 VFS_VOP_VECTOR_REGISTER(ext2_fifoops);
  204 
  205 /*
  206  * A virgin directory (no blushing please).
  207  * Note that the type and namlen fields are reversed relative to ext2.
  208  * Also, we don't use `struct odirtemplate', since it would just cause
  209  * endianness problems.
  210  */
  211 static struct dirtemplate mastertemplate = {
  212         0, htole16(12), 1, EXT2_FT_DIR, ".",
  213         0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_DIR, ".."
  214 };
  215 static struct dirtemplate omastertemplate = {
  216         0, htole16(12), 1, EXT2_FT_UNKNOWN, ".",
  217         0, htole16(DIRBLKSIZ - 12), 2, EXT2_FT_UNKNOWN, ".."
  218 };
  219 
  220 static void
  221 ext2_itimes_locked(struct vnode *vp)
  222 {
  223         struct inode *ip;
  224         struct timespec ts;
  225 
  226         ASSERT_VI_LOCKED(vp, __func__);
  227 
  228         ip = VTOI(vp);
  229         if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
  230                 return;
  231         if ((vp->v_type == VBLK || vp->v_type == VCHR))
  232                 ip->i_flag |= IN_LAZYMOD;
  233         else
  234                 ip->i_flag |= IN_MODIFIED;
  235         if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
  236                 vfs_timestamp(&ts);
  237                 if (ip->i_flag & IN_ACCESS) {
  238                         ip->i_atime = ts.tv_sec;
  239                         ip->i_atimensec = ts.tv_nsec;
  240                 }
  241                 if (ip->i_flag & IN_UPDATE) {
  242                         ip->i_mtime = ts.tv_sec;
  243                         ip->i_mtimensec = ts.tv_nsec;
  244                         ip->i_modrev++;
  245                 }
  246                 if (ip->i_flag & IN_CHANGE) {
  247                         ip->i_ctime = ts.tv_sec;
  248                         ip->i_ctimensec = ts.tv_nsec;
  249                 }
  250         }
  251         ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
  252 }
  253 
  254 void
  255 ext2_itimes(struct vnode *vp)
  256 {
  257 
  258         VI_LOCK(vp);
  259         ext2_itimes_locked(vp);
  260         VI_UNLOCK(vp);
  261 }
  262 
  263 /*
  264  * Create a regular file
  265  */
  266 static int
  267 ext2_create(struct vop_create_args *ap)
  268 {
  269         int error;
  270 
  271         error =
  272             ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
  273             ap->a_dvp, ap->a_vpp, ap->a_cnp);
  274         if (error != 0)
  275                 return (error);
  276         if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
  277                 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
  278         return (0);
  279 }
  280 
  281 static int
  282 ext2_open(struct vop_open_args *ap)
  283 {
  284 
  285         if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
  286                 return (EOPNOTSUPP);
  287 
  288         /*
  289          * Files marked append-only must be opened for appending.
  290          */
  291         if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
  292             (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
  293                 return (EPERM);
  294 
  295         vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
  296 
  297         return (0);
  298 }
  299 
  300 /*
  301  * Close called.
  302  *
  303  * Update the times on the inode.
  304  */
  305 static int
  306 ext2_close(struct vop_close_args *ap)
  307 {
  308         struct vnode *vp = ap->a_vp;
  309 
  310         VI_LOCK(vp);
  311         if (vp->v_usecount > 1)
  312                 ext2_itimes_locked(vp);
  313         VI_UNLOCK(vp);
  314         return (0);
  315 }
  316 
  317 static int
  318 ext2_access(struct vop_access_args *ap)
  319 {
  320         struct vnode *vp = ap->a_vp;
  321         struct inode *ip = VTOI(vp);
  322         accmode_t accmode = ap->a_accmode;
  323         int error;
  324 
  325         if (vp->v_type == VBLK || vp->v_type == VCHR)
  326                 return (EOPNOTSUPP);
  327 
  328         /*
  329          * Disallow write attempts on read-only file systems;
  330          * unless the file is a socket, fifo, or a block or
  331          * character device resident on the file system.
  332          */
  333         if (accmode & VWRITE) {
  334                 switch (vp->v_type) {
  335                 case VDIR:
  336                 case VLNK:
  337                 case VREG:
  338                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  339                                 return (EROFS);
  340                         break;
  341                 default:
  342                         break;
  343                 }
  344         }
  345 
  346         /* If immutable bit set, nobody gets to write it. */
  347         if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
  348                 return (EPERM);
  349 
  350         error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
  351             ap->a_accmode, ap->a_cred);
  352         return (error);
  353 }
  354 
  355 static int
  356 ext2_getattr(struct vop_getattr_args *ap)
  357 {
  358         struct vnode *vp = ap->a_vp;
  359         struct inode *ip = VTOI(vp);
  360         struct vattr *vap = ap->a_vap;
  361 
  362         ext2_itimes(vp);
  363         /*
  364          * Copy from inode table
  365          */
  366         vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
  367         vap->va_fileid = ip->i_number;
  368         vap->va_mode = ip->i_mode & ~IFMT;
  369         vap->va_nlink = ip->i_nlink;
  370         vap->va_uid = ip->i_uid;
  371         vap->va_gid = ip->i_gid;
  372         vap->va_rdev = ip->i_rdev;
  373         vap->va_size = ip->i_size;
  374         vap->va_atime.tv_sec = ip->i_atime;
  375         vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
  376         vap->va_mtime.tv_sec = ip->i_mtime;
  377         vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
  378         vap->va_ctime.tv_sec = ip->i_ctime;
  379         vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
  380         if E2DI_HAS_XTIME(ip) {
  381                 vap->va_birthtime.tv_sec = ip->i_birthtime;
  382                 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
  383         }
  384         vap->va_flags = ip->i_flags;
  385         vap->va_gen = ip->i_gen;
  386         vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
  387         vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
  388         vap->va_type = IFTOVT(ip->i_mode);
  389         vap->va_filerev = ip->i_modrev;
  390         return (0);
  391 }
  392 
  393 /*
  394  * Set attribute vnode op. called from several syscalls
  395  */
  396 static int
  397 ext2_setattr(struct vop_setattr_args *ap)
  398 {
  399         struct vattr *vap = ap->a_vap;
  400         struct vnode *vp = ap->a_vp;
  401         struct inode *ip = VTOI(vp);
  402         struct ucred *cred = ap->a_cred;
  403         struct thread *td = curthread;
  404         int error;
  405 
  406         /*
  407          * Check for unsettable attributes.
  408          */
  409         if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
  410             (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
  411             (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
  412             ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
  413                 return (EINVAL);
  414         }
  415         if (vap->va_flags != VNOVAL) {
  416                 /* Disallow flags not supported by ext2fs. */
  417                 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
  418                         return (EOPNOTSUPP);
  419 
  420                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  421                         return (EROFS);
  422                 /*
  423                  * Callers may only modify the file flags on objects they
  424                  * have VADMIN rights for.
  425                  */
  426                 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  427                         return (error);
  428                 /*
  429                  * Unprivileged processes and privileged processes in
  430                  * jail() are not permitted to unset system flags, or
  431                  * modify flags if any system flags are set.
  432                  * Privileged non-jail processes may not modify system flags
  433                  * if securelevel > 0 and any existing system flags are set.
  434                  */
  435                 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS)) {
  436                         if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
  437                                 error = securelevel_gt(cred, 0);
  438                                 if (error)
  439                                         return (error);
  440                         }
  441                 } else {
  442                         if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
  443                             ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
  444                                 return (EPERM);
  445                 }
  446                 ip->i_flags = vap->va_flags;
  447                 ip->i_flag |= IN_CHANGE;
  448                 if (ip->i_flags & (IMMUTABLE | APPEND))
  449                         return (0);
  450         }
  451         if (ip->i_flags & (IMMUTABLE | APPEND))
  452                 return (EPERM);
  453         /*
  454          * Go through the fields and update iff not VNOVAL.
  455          */
  456         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
  457                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  458                         return (EROFS);
  459                 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
  460                     td)) != 0)
  461                         return (error);
  462         }
  463         if (vap->va_size != VNOVAL) {
  464                 /*
  465                  * Disallow write attempts on read-only file systems;
  466                  * unless the file is a socket, fifo, or a block or
  467                  * character device resident on the file system.
  468                  */
  469                 switch (vp->v_type) {
  470                 case VDIR:
  471                         return (EISDIR);
  472                 case VLNK:
  473                 case VREG:
  474                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  475                                 return (EROFS);
  476                         break;
  477                 default:
  478                         break;
  479                 }
  480                 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
  481                         return (error);
  482         }
  483         if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
  484                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  485                         return (EROFS);
  486                 /*
  487                  * From utimes(2):
  488                  * If times is NULL, ... The caller must be the owner of
  489                  * the file, have permission to write the file, or be the
  490                  * super-user.
  491                  * If times is non-NULL, ... The caller must be the owner of
  492                  * the file or be the super-user.
  493                  */
  494                 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
  495                     ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
  496                     (error = VOP_ACCESS(vp, VWRITE, cred, td))))
  497                         return (error);
  498                 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
  499                 if (vap->va_atime.tv_sec != VNOVAL) {
  500                         ip->i_flag &= ~IN_ACCESS;
  501                         ip->i_atime = vap->va_atime.tv_sec;
  502                         ip->i_atimensec = vap->va_atime.tv_nsec;
  503                 }
  504                 if (vap->va_mtime.tv_sec != VNOVAL) {
  505                         ip->i_flag &= ~IN_UPDATE;
  506                         ip->i_mtime = vap->va_mtime.tv_sec;
  507                         ip->i_mtimensec = vap->va_mtime.tv_nsec;
  508                 }
  509                 ip->i_birthtime = vap->va_birthtime.tv_sec;
  510                 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
  511                 error = ext2_update(vp, 0);
  512                 if (error)
  513                         return (error);
  514         }
  515         error = 0;
  516         if (vap->va_mode != (mode_t)VNOVAL) {
  517                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  518                         return (EROFS);
  519                 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
  520         }
  521         return (error);
  522 }
  523 
  524 /*
  525  * Change the mode on a file.
  526  * Inode must be locked before calling.
  527  */
  528 static int
  529 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
  530 {
  531         struct inode *ip = VTOI(vp);
  532         int error;
  533 
  534         /*
  535          * To modify the permissions on a file, must possess VADMIN
  536          * for that file.
  537          */
  538         if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  539                 return (error);
  540         /*
  541          * Privileged processes may set the sticky bit on non-directories,
  542          * as well as set the setgid bit on a file with a group that the
  543          * process is not a member of.
  544          */
  545         if (vp->v_type != VDIR && (mode & S_ISTXT)) {
  546                 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE);
  547                 if (error)
  548                         return (EFTYPE);
  549         }
  550         if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
  551                 error = priv_check_cred(cred, PRIV_VFS_SETGID);
  552                 if (error)
  553                         return (error);
  554         }
  555         ip->i_mode &= ~ALLPERMS;
  556         ip->i_mode |= (mode & ALLPERMS);
  557         ip->i_flag |= IN_CHANGE;
  558         return (0);
  559 }
  560 
  561 /*
  562  * Perform chown operation on inode ip;
  563  * inode must be locked prior to call.
  564  */
  565 static int
  566 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
  567     struct thread *td)
  568 {
  569         struct inode *ip = VTOI(vp);
  570         uid_t ouid;
  571         gid_t ogid;
  572         int error = 0;
  573 
  574         if (uid == (uid_t)VNOVAL)
  575                 uid = ip->i_uid;
  576         if (gid == (gid_t)VNOVAL)
  577                 gid = ip->i_gid;
  578         /*
  579          * To modify the ownership of a file, must possess VADMIN
  580          * for that file.
  581          */
  582         if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  583                 return (error);
  584         /*
  585          * To change the owner of a file, or change the group of a file
  586          * to a group of which we are not a member, the caller must
  587          * have privilege.
  588          */
  589         if (uid != ip->i_uid || (gid != ip->i_gid &&
  590             !groupmember(gid, cred))) {
  591                 error = priv_check_cred(cred, PRIV_VFS_CHOWN);
  592                 if (error)
  593                         return (error);
  594         }
  595         ogid = ip->i_gid;
  596         ouid = ip->i_uid;
  597         ip->i_gid = gid;
  598         ip->i_uid = uid;
  599         ip->i_flag |= IN_CHANGE;
  600         if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
  601                 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID) != 0)
  602                         ip->i_mode &= ~(ISUID | ISGID);
  603         }
  604         return (0);
  605 }
  606 
  607 /*
  608  * Synch an open file.
  609  */
  610 /* ARGSUSED */
  611 static int
  612 ext2_fsync(struct vop_fsync_args *ap)
  613 {
  614         /*
  615          * Flush all dirty buffers associated with a vnode.
  616          */
  617 
  618         vop_stdfsync(ap);
  619 
  620         return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
  621 }
  622 
  623 /*
  624  * Mknod vnode call
  625  */
  626 /* ARGSUSED */
  627 static int
  628 ext2_mknod(struct vop_mknod_args *ap)
  629 {
  630         struct vattr *vap = ap->a_vap;
  631         struct vnode **vpp = ap->a_vpp;
  632         struct inode *ip;
  633         ino_t ino;
  634         int error;
  635 
  636         error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
  637             ap->a_dvp, vpp, ap->a_cnp);
  638         if (error)
  639                 return (error);
  640         ip = VTOI(*vpp);
  641         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
  642         if (vap->va_rdev != VNOVAL) {
  643                 /*
  644                  * Want to be able to use this to make badblock
  645                  * inodes, so don't truncate the dev number.
  646                  */
  647                 if (!(ip->i_flag & IN_E4EXTENTS))
  648                         ip->i_rdev = vap->va_rdev;
  649         }
  650         /*
  651          * Remove inode, then reload it through VFS_VGET so it is
  652          * checked to see if it is an alias of an existing entry in
  653          * the inode cache.      XXX I don't believe this is necessary now.
  654          */
  655         (*vpp)->v_type = VNON;
  656         ino = ip->i_number;     /* Save this before vgone() invalidates ip. */
  657         vgone(*vpp);
  658         vput(*vpp);
  659         error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
  660         if (error) {
  661                 *vpp = NULL;
  662                 return (error);
  663         }
  664         return (0);
  665 }
  666 
  667 static int
  668 ext2_remove(struct vop_remove_args *ap)
  669 {
  670         struct inode *ip;
  671         struct vnode *vp = ap->a_vp;
  672         struct vnode *dvp = ap->a_dvp;
  673         int error;
  674 
  675         ip = VTOI(vp);
  676         if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
  677             (VTOI(dvp)->i_flags & APPEND)) {
  678                 error = EPERM;
  679                 goto out;
  680         }
  681         error = ext2_dirremove(dvp, ap->a_cnp);
  682         if (error == 0) {
  683                 ip->i_nlink--;
  684                 ip->i_flag |= IN_CHANGE;
  685         }
  686 out:
  687         return (error);
  688 }
  689 
  690 /*
  691  * link vnode call
  692  */
  693 static int
  694 ext2_link(struct vop_link_args *ap)
  695 {
  696         struct vnode *vp = ap->a_vp;
  697         struct vnode *tdvp = ap->a_tdvp;
  698         struct componentname *cnp = ap->a_cnp;
  699         struct inode *ip;
  700         int error;
  701 
  702 #ifdef INVARIANTS
  703         if ((cnp->cn_flags & HASBUF) == 0)
  704                 panic("ext2_link: no name");
  705 #endif
  706         ip = VTOI(vp);
  707         if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) {
  708                 error = EMLINK;
  709                 goto out;
  710         }
  711         if (ip->i_flags & (IMMUTABLE | APPEND)) {
  712                 error = EPERM;
  713                 goto out;
  714         }
  715         ip->i_nlink++;
  716         ip->i_flag |= IN_CHANGE;
  717         error = ext2_update(vp, !DOINGASYNC(vp));
  718         if (!error)
  719                 error = ext2_direnter(ip, tdvp, cnp);
  720         if (error) {
  721                 ip->i_nlink--;
  722                 ip->i_flag |= IN_CHANGE;
  723         }
  724 out:
  725         return (error);
  726 }
  727 
  728 static int
  729 ext2_inc_nlink(struct inode *ip)
  730 {
  731 
  732         ip->i_nlink++;
  733 
  734         if (S_ISDIR(ip->i_mode) &&
  735             EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) &&
  736             ip->i_nlink > 1) {
  737                 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2)
  738                         ip->i_nlink = 1;
  739         } else if (ip->i_nlink > EXT4_LINK_MAX) {
  740                 ip->i_nlink--;
  741                 return (EMLINK);
  742         }
  743 
  744         return (0);
  745 }
  746 
  747 static void
  748 ext2_dec_nlink(struct inode *ip)
  749 {
  750 
  751         if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2)
  752                 ip->i_nlink--;
  753 }
  754 
  755 /*
  756  * Rename system call.
  757  *      rename("foo", "bar");
  758  * is essentially
  759  *      unlink("bar");
  760  *      link("foo", "bar");
  761  *      unlink("foo");
  762  * but ``atomically''.  Can't do full commit without saving state in the
  763  * inode on disk which isn't feasible at this time.  Best we can do is
  764  * always guarantee the target exists.
  765  *
  766  * Basic algorithm is:
  767  *
  768  * 1) Bump link count on source while we're linking it to the
  769  *    target.  This also ensure the inode won't be deleted out
  770  *    from underneath us while we work (it may be truncated by
  771  *    a concurrent `trunc' or `open' for creation).
  772  * 2) Link source to destination.  If destination already exists,
  773  *    delete it first.
  774  * 3) Unlink source reference to inode if still around. If a
  775  *    directory was moved and the parent of the destination
  776  *    is different from the source, patch the ".." entry in the
  777  *    directory.
  778  */
  779 static int
  780 ext2_rename(struct vop_rename_args *ap)
  781 {
  782         struct vnode *tvp = ap->a_tvp;
  783         struct vnode *tdvp = ap->a_tdvp;
  784         struct vnode *fvp = ap->a_fvp;
  785         struct vnode *fdvp = ap->a_fdvp;
  786         struct componentname *tcnp = ap->a_tcnp;
  787         struct componentname *fcnp = ap->a_fcnp;
  788         struct inode *ip, *xp, *dp;
  789         struct dirtemplate *dirbuf;
  790         int doingdirectory = 0, oldparent = 0, newparent = 0;
  791         int error = 0;
  792         u_char namlen;
  793 
  794 #ifdef INVARIANTS
  795         if ((tcnp->cn_flags & HASBUF) == 0 ||
  796             (fcnp->cn_flags & HASBUF) == 0)
  797                 panic("ext2_rename: no name");
  798 #endif
  799         /*
  800          * Check for cross-device rename.
  801          */
  802         if ((fvp->v_mount != tdvp->v_mount) ||
  803             (tvp && (fvp->v_mount != tvp->v_mount))) {
  804                 error = EXDEV;
  805 abortit:
  806                 if (tdvp == tvp)
  807                         vrele(tdvp);
  808                 else
  809                         vput(tdvp);
  810                 if (tvp)
  811                         vput(tvp);
  812                 vrele(fdvp);
  813                 vrele(fvp);
  814                 return (error);
  815         }
  816 
  817         if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
  818             (VTOI(tdvp)->i_flags & APPEND))) {
  819                 error = EPERM;
  820                 goto abortit;
  821         }
  822 
  823         /*
  824          * Renaming a file to itself has no effect.  The upper layers should
  825          * not call us in that case.  Temporarily just warn if they do.
  826          */
  827         if (fvp == tvp) {
  828                 SDT_PROBE2(ext2fs, , vnops, trace, 1,
  829                     "rename: fvp == tvp (can't happen)");
  830                 error = 0;
  831                 goto abortit;
  832         }
  833 
  834         if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
  835                 goto abortit;
  836         dp = VTOI(fdvp);
  837         ip = VTOI(fvp);
  838         if (ip->i_nlink >= EXT4_LINK_MAX &&
  839             !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
  840                 VOP_UNLOCK(fvp);
  841                 error = EMLINK;
  842                 goto abortit;
  843         }
  844         if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
  845             || (dp->i_flags & APPEND)) {
  846                 VOP_UNLOCK(fvp);
  847                 error = EPERM;
  848                 goto abortit;
  849         }
  850         if ((ip->i_mode & IFMT) == IFDIR) {
  851                 /*
  852                  * Avoid ".", "..", and aliases of "." for obvious reasons.
  853                  */
  854                 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
  855                     dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
  856                     (ip->i_flag & IN_RENAME)) {
  857                         VOP_UNLOCK(fvp);
  858                         error = EINVAL;
  859                         goto abortit;
  860                 }
  861                 ip->i_flag |= IN_RENAME;
  862                 oldparent = dp->i_number;
  863                 doingdirectory++;
  864         }
  865         vrele(fdvp);
  866 
  867         /*
  868          * When the target exists, both the directory
  869          * and target vnodes are returned locked.
  870          */
  871         dp = VTOI(tdvp);
  872         xp = NULL;
  873         if (tvp)
  874                 xp = VTOI(tvp);
  875 
  876         /*
  877          * 1) Bump link count while we're moving stuff
  878          *    around.  If we crash somewhere before
  879          *    completing our work, the link count
  880          *    may be wrong, but correctable.
  881          */
  882         ext2_inc_nlink(ip);
  883         ip->i_flag |= IN_CHANGE;
  884         if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
  885                 VOP_UNLOCK(fvp);
  886                 goto bad;
  887         }
  888 
  889         /*
  890          * If ".." must be changed (ie the directory gets a new
  891          * parent) then the source directory must not be in the
  892          * directory hierarchy above the target, as this would
  893          * orphan everything below the source directory. Also
  894          * the user must have write permission in the source so
  895          * as to be able to change "..". We must repeat the call
  896          * to namei, as the parent directory is unlocked by the
  897          * call to checkpath().
  898          */
  899         error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
  900         VOP_UNLOCK(fvp);
  901         if (oldparent != dp->i_number)
  902                 newparent = dp->i_number;
  903         if (doingdirectory && newparent) {
  904                 if (error)      /* write access check above */
  905                         goto bad;
  906                 if (xp != NULL)
  907                         vput(tvp);
  908                 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
  909                 if (error)
  910                         goto out;
  911                 VREF(tdvp);
  912                 error = relookup(tdvp, &tvp, tcnp);
  913                 if (error)
  914                         goto out;
  915                 vrele(tdvp);
  916                 dp = VTOI(tdvp);
  917                 xp = NULL;
  918                 if (tvp)
  919                         xp = VTOI(tvp);
  920         }
  921         /*
  922          * 2) If target doesn't exist, link the target
  923          *    to the source and unlink the source.
  924          *    Otherwise, rewrite the target directory
  925          *    entry to reference the source inode and
  926          *    expunge the original entry's existence.
  927          */
  928         if (xp == NULL) {
  929                 if (dp->i_devvp != ip->i_devvp)
  930                         panic("ext2_rename: EXDEV");
  931                 /*
  932                  * Account for ".." in new directory.
  933                  * When source and destination have the same
  934                  * parent we don't fool with the link count.
  935                  */
  936                 if (doingdirectory && newparent) {
  937                         error = ext2_inc_nlink(dp);
  938                         if (error)
  939                                 goto bad;
  940 
  941                         dp->i_flag |= IN_CHANGE;
  942                         error = ext2_update(tdvp, !DOINGASYNC(tdvp));
  943                         if (error)
  944                                 goto bad;
  945                 }
  946                 error = ext2_direnter(ip, tdvp, tcnp);
  947                 if (error) {
  948                         if (doingdirectory && newparent) {
  949                                 ext2_dec_nlink(dp);
  950                                 dp->i_flag |= IN_CHANGE;
  951                                 (void)ext2_update(tdvp, 1);
  952                         }
  953                         goto bad;
  954                 }
  955                 vput(tdvp);
  956         } else {
  957                 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
  958                         panic("ext2_rename: EXDEV");
  959                 /*
  960                  * Short circuit rename(foo, foo).
  961                  */
  962                 if (xp->i_number == ip->i_number)
  963                         panic("ext2_rename: same file");
  964                 /*
  965                  * If the parent directory is "sticky", then the user must
  966                  * own the parent directory, or the destination of the rename,
  967                  * otherwise the destination may not be changed (except by
  968                  * root). This implements append-only directories.
  969                  */
  970                 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
  971                     tcnp->cn_cred->cr_uid != dp->i_uid &&
  972                     xp->i_uid != tcnp->cn_cred->cr_uid) {
  973                         error = EPERM;
  974                         goto bad;
  975                 }
  976                 /*
  977                  * Target must be empty if a directory and have no links
  978                  * to it. Also, ensure source and target are compatible
  979                  * (both directories, or both not directories).
  980                  */
  981                 if ((xp->i_mode & IFMT) == IFDIR) {
  982                         if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
  983                                 error = ENOTEMPTY;
  984                                 goto bad;
  985                         }
  986                         if (!doingdirectory) {
  987                                 error = ENOTDIR;
  988                                 goto bad;
  989                         }
  990                         cache_purge(tdvp);
  991                 } else if (doingdirectory) {
  992                         error = EISDIR;
  993                         goto bad;
  994                 }
  995                 error = ext2_dirrewrite(dp, ip, tcnp);
  996                 if (error)
  997                         goto bad;
  998                 /*
  999                  * If the target directory is in the same
 1000                  * directory as the source directory,
 1001                  * decrement the link count on the parent
 1002                  * of the target directory.
 1003                  */
 1004                 if (doingdirectory && !newparent) {
 1005                         ext2_dec_nlink(dp);
 1006                         dp->i_flag |= IN_CHANGE;
 1007                 }
 1008                 vput(tdvp);
 1009                 /*
 1010                  * Adjust the link count of the target to
 1011                  * reflect the dirrewrite above.  If this is
 1012                  * a directory it is empty and there are
 1013                  * no links to it, so we can squash the inode and
 1014                  * any space associated with it.  We disallowed
 1015                  * renaming over top of a directory with links to
 1016                  * it above, as the remaining link would point to
 1017                  * a directory without "." or ".." entries.
 1018                  */
 1019                 ext2_dec_nlink(xp);
 1020                 if (doingdirectory) {
 1021                         if (xp->i_nlink > 2)
 1022                                 panic("ext2_rename: linked directory");
 1023                         error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
 1024                             tcnp->cn_cred, tcnp->cn_thread);
 1025                         xp->i_nlink = 0;
 1026                 }
 1027                 xp->i_flag |= IN_CHANGE;
 1028                 vput(tvp);
 1029                 xp = NULL;
 1030         }
 1031 
 1032         /*
 1033          * 3) Unlink the source.
 1034          */
 1035         fcnp->cn_flags &= ~MODMASK;
 1036         fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
 1037         VREF(fdvp);
 1038         error = relookup(fdvp, &fvp, fcnp);
 1039         if (error == 0)
 1040                 vrele(fdvp);
 1041         if (fvp != NULL) {
 1042                 xp = VTOI(fvp);
 1043                 dp = VTOI(fdvp);
 1044         } else {
 1045                 /*
 1046                  * From name has disappeared.  IN_RENAME is not sufficient
 1047                  * to protect against directory races due to timing windows,
 1048                  * so we can't panic here.
 1049                  */
 1050                 vrele(ap->a_fvp);
 1051                 return (0);
 1052         }
 1053         /*
 1054          * Ensure that the directory entry still exists and has not
 1055          * changed while the new name has been entered. If the source is
 1056          * a file then the entry may have been unlinked or renamed. In
 1057          * either case there is no further work to be done. If the source
 1058          * is a directory then it cannot have been rmdir'ed; its link
 1059          * count of three would cause a rmdir to fail with ENOTEMPTY.
 1060          * The IN_RENAME flag ensures that it cannot be moved by another
 1061          * rename.
 1062          */
 1063         if (xp != ip) {
 1064                 /*
 1065                  * From name resolves to a different inode.  IN_RENAME is
 1066                  * not sufficient protection against timing window races
 1067                  * so we can't panic here.
 1068                  */
 1069         } else {
 1070                 /*
 1071                  * If the source is a directory with a
 1072                  * new parent, the link count of the old
 1073                  * parent directory must be decremented
 1074                  * and ".." set to point to the new parent.
 1075                  */
 1076                 if (doingdirectory && newparent) {
 1077                         ext2_dec_nlink(dp);
 1078                         dp->i_flag |= IN_CHANGE;
 1079                         dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO);
 1080                         error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf,
 1081                             ip->i_e2fs->e2fs_bsize, (off_t)0,
 1082                             UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
 1083                             tcnp->cn_cred, NOCRED, NULL, NULL);
 1084                         if (error == 0) {
 1085                                 /* Like ufs little-endian: */
 1086                                 namlen = dirbuf->dotdot_type;
 1087                                 if (namlen != 2 ||
 1088                                     dirbuf->dotdot_name[0] != '.' ||
 1089                                     dirbuf->dotdot_name[1] != '.') {
 1090                                         ext2_dirbad(xp, (doff_t)12,
 1091                                             "rename: mangled dir");
 1092                                 } else {
 1093                                         dirbuf->dotdot_ino = htole32(newparent);
 1094                                         /*
 1095                                          * dirblock 0 could be htree root,
 1096                                          * try both csum update functions.
 1097                                          */
 1098                                         ext2_dirent_csum_set(ip,
 1099                                             (struct ext2fs_direct_2 *)dirbuf);
 1100                                         ext2_dx_csum_set(ip,
 1101                                             (struct ext2fs_direct_2 *)dirbuf);
 1102                                         (void)vn_rdwr(UIO_WRITE, fvp,
 1103                                             (caddr_t)dirbuf,
 1104                                             ip->i_e2fs->e2fs_bsize,
 1105                                             (off_t)0, UIO_SYSSPACE,
 1106                                             IO_NODELOCKED | IO_SYNC |
 1107                                             IO_NOMACCHECK, tcnp->cn_cred,
 1108                                             NOCRED, NULL, NULL);
 1109                                         cache_purge(fdvp);
 1110                                 }
 1111                         }
 1112                         free(dirbuf, M_TEMP);
 1113                 }
 1114                 error = ext2_dirremove(fdvp, fcnp);
 1115                 if (!error) {
 1116                         ext2_dec_nlink(xp);
 1117                         xp->i_flag |= IN_CHANGE;
 1118                 }
 1119                 xp->i_flag &= ~IN_RENAME;
 1120         }
 1121         if (dp)
 1122                 vput(fdvp);
 1123         if (xp)
 1124                 vput(fvp);
 1125         vrele(ap->a_fvp);
 1126         return (error);
 1127 
 1128 bad:
 1129         if (xp)
 1130                 vput(ITOV(xp));
 1131         vput(ITOV(dp));
 1132 out:
 1133         if (doingdirectory)
 1134                 ip->i_flag &= ~IN_RENAME;
 1135         if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
 1136                 ext2_dec_nlink(ip);
 1137                 ip->i_flag |= IN_CHANGE;
 1138                 ip->i_flag &= ~IN_RENAME;
 1139                 vput(fvp);
 1140         } else
 1141                 vrele(fvp);
 1142         return (error);
 1143 }
 1144 
 1145 #ifdef UFS_ACL
 1146 static int
 1147 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp,
 1148     mode_t dmode, struct ucred *cred, struct thread *td)
 1149 {
 1150         int error;
 1151         struct inode *ip = VTOI(tvp);
 1152         struct acl *dacl, *acl;
 1153 
 1154         acl = acl_alloc(M_WAITOK);
 1155         dacl = acl_alloc(M_WAITOK);
 1156 
 1157         /*
 1158          * Retrieve default ACL from parent, if any.
 1159          */
 1160         error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
 1161         switch (error) {
 1162         case 0:
 1163                 /*
 1164                  * Retrieved a default ACL, so merge mode and ACL if
 1165                  * necessary.  If the ACL is empty, fall through to
 1166                  * the "not defined or available" case.
 1167                  */
 1168                 if (acl->acl_cnt != 0) {
 1169                         dmode = acl_posix1e_newfilemode(dmode, acl);
 1170                         ip->i_mode = dmode;
 1171                         *dacl = *acl;
 1172                         ext2_sync_acl_from_inode(ip, acl);
 1173                         break;
 1174                 }
 1175                 /* FALLTHROUGH */
 1176 
 1177         case EOPNOTSUPP:
 1178                 /*
 1179                  * Just use the mode as-is.
 1180                  */
 1181                 ip->i_mode = dmode;
 1182                 error = 0;
 1183                 goto out;
 1184 
 1185         default:
 1186                 goto out;
 1187         }
 1188 
 1189         error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
 1190         if (error == 0)
 1191                 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td);
 1192         switch (error) {
 1193         case 0:
 1194                 break;
 1195 
 1196         case EOPNOTSUPP:
 1197                 /*
 1198                  * XXX: This should not happen, as EOPNOTSUPP above
 1199                  * was supposed to free acl.
 1200                  */
 1201 #ifdef DEBUG
 1202                 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n");
 1203 #endif  /* DEBUG */
 1204                 break;
 1205 
 1206         default:
 1207                 goto out;
 1208         }
 1209 
 1210 out:
 1211         acl_free(acl);
 1212         acl_free(dacl);
 1213 
 1214         return (error);
 1215 }
 1216 
 1217 static int
 1218 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp,
 1219     mode_t mode, struct ucred *cred, struct thread *td)
 1220 {
 1221         int error;
 1222         struct inode *ip = VTOI(tvp);
 1223         struct acl *acl;
 1224 
 1225         acl = acl_alloc(M_WAITOK);
 1226 
 1227         /*
 1228          * Retrieve default ACL for parent, if any.
 1229          */
 1230         error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
 1231         switch (error) {
 1232         case 0:
 1233                 /*
 1234                  * Retrieved a default ACL, so merge mode and ACL if
 1235                  * necessary.
 1236                  */
 1237                 if (acl->acl_cnt != 0) {
 1238                         /*
 1239                          * Two possible ways for default ACL to not
 1240                          * be present.  First, the EA can be
 1241                          * undefined, or second, the default ACL can
 1242                          * be blank.  If it's blank, fall through to
 1243                          * the it's not defined case.
 1244                          */
 1245                         mode = acl_posix1e_newfilemode(mode, acl);
 1246                         ip->i_mode = mode;
 1247                         ext2_sync_acl_from_inode(ip, acl);
 1248                         break;
 1249                 }
 1250                 /* FALLTHROUGH */
 1251 
 1252         case EOPNOTSUPP:
 1253                 /*
 1254                  * Just use the mode as-is.
 1255                  */
 1256                 ip->i_mode = mode;
 1257                 error = 0;
 1258                 goto out;
 1259 
 1260         default:
 1261                 goto out;
 1262         }
 1263 
 1264         error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
 1265         switch (error) {
 1266         case 0:
 1267                 break;
 1268 
 1269         case EOPNOTSUPP:
 1270                 /*
 1271                  * XXX: This should not happen, as EOPNOTSUPP above was
 1272                  * supposed to free acl.
 1273                  */
 1274                 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
 1275                     "but no VOP_SETACL()\n");
 1276                 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
 1277                     "but no VOP_SETACL()"); */
 1278                 break;
 1279 
 1280         default:
 1281                 goto out;
 1282         }
 1283 
 1284 out:
 1285         acl_free(acl);
 1286 
 1287         return (error);
 1288 }
 1289 
 1290 #endif /* UFS_ACL */
 1291 
 1292 /*
 1293  * Mkdir system call
 1294  */
 1295 static int
 1296 ext2_mkdir(struct vop_mkdir_args *ap)
 1297 {
 1298         struct m_ext2fs *fs;
 1299         struct vnode *dvp = ap->a_dvp;
 1300         struct vattr *vap = ap->a_vap;
 1301         struct componentname *cnp = ap->a_cnp;
 1302         struct inode *ip, *dp;
 1303         struct vnode *tvp;
 1304         struct dirtemplate dirtemplate, *dtp;
 1305         char *buf = NULL;
 1306         int error, dmode;
 1307 
 1308 #ifdef INVARIANTS
 1309         if ((cnp->cn_flags & HASBUF) == 0)
 1310                 panic("ext2_mkdir: no name");
 1311 #endif
 1312         dp = VTOI(dvp);
 1313         if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX &&
 1314             !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
 1315                 error = EMLINK;
 1316                 goto out;
 1317         }
 1318         dmode = vap->va_mode & 0777;
 1319         dmode |= IFDIR;
 1320         /*
 1321          * Must simulate part of ext2_makeinode here to acquire the inode,
 1322          * but not have it entered in the parent directory. The entry is
 1323          * made later after writing "." and ".." entries.
 1324          */
 1325         error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
 1326         if (error)
 1327                 goto out;
 1328         ip = VTOI(tvp);
 1329         fs = ip->i_e2fs;
 1330         ip->i_gid = dp->i_gid;
 1331 #ifdef SUIDDIR
 1332         {
 1333                 /*
 1334                  * if we are hacking owners here, (only do this where told to)
 1335                  * and we are not giving it TOO root, (would subvert quotas)
 1336                  * then go ahead and give it to the other user.
 1337                  * The new directory also inherits the SUID bit.
 1338                  * If user's UID and dir UID are the same,
 1339                  * 'give it away' so that the SUID is still forced on.
 1340                  */
 1341                 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
 1342                     (dp->i_mode & ISUID) && dp->i_uid) {
 1343                         dmode |= ISUID;
 1344                         ip->i_uid = dp->i_uid;
 1345                 } else {
 1346                         ip->i_uid = cnp->cn_cred->cr_uid;
 1347                 }
 1348         }
 1349 #else
 1350         ip->i_uid = cnp->cn_cred->cr_uid;
 1351 #endif
 1352         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
 1353         ip->i_mode = dmode;
 1354         tvp->v_type = VDIR;     /* Rest init'd in getnewvnode(). */
 1355         ip->i_nlink = 2;
 1356         if (cnp->cn_flags & ISWHITEOUT)
 1357                 ip->i_flags |= UF_OPAQUE;
 1358         error = ext2_update(tvp, 1);
 1359 
 1360         /*
 1361          * Bump link count in parent directory
 1362          * to reflect work done below.  Should
 1363          * be done before reference is created
 1364          * so reparation is possible if we crash.
 1365          */
 1366         ext2_inc_nlink(dp);
 1367         dp->i_flag |= IN_CHANGE;
 1368         error = ext2_update(dvp, !DOINGASYNC(dvp));
 1369         if (error)
 1370                 goto bad;
 1371 
 1372         /* Initialize directory with "." and ".." from static template. */
 1373         if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
 1374             EXT2F_INCOMPAT_FTYPE))
 1375                 dtp = &mastertemplate;
 1376         else
 1377                 dtp = &omastertemplate;
 1378         dirtemplate = *dtp;
 1379         dirtemplate.dot_ino = htole32(ip->i_number);
 1380         dirtemplate.dotdot_ino = htole32(dp->i_number);
 1381         /*
 1382          * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's
 1383          * just redefine it - for this function only
 1384          */
 1385 #undef  DIRBLKSIZ
 1386 #define DIRBLKSIZ  VTOI(dvp)->i_e2fs->e2fs_bsize
 1387         dirtemplate.dotdot_reclen = htole16(DIRBLKSIZ - 12);
 1388         buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO);
 1389         if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
 1390                 dirtemplate.dotdot_reclen =
 1391                     htole16(le16toh(dirtemplate.dotdot_reclen) -
 1392                     sizeof(struct ext2fs_direct_tail));
 1393                 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ));
 1394         }
 1395         memcpy(buf, &dirtemplate, sizeof(dirtemplate));
 1396         ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf);
 1397         error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf,
 1398             DIRBLKSIZ, (off_t)0, UIO_SYSSPACE,
 1399             IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
 1400             NULL, NULL);
 1401         if (error) {
 1402                 ext2_dec_nlink(dp);
 1403                 dp->i_flag |= IN_CHANGE;
 1404                 goto bad;
 1405         }
 1406         if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
 1407                 /* XXX should grow with balloc() */
 1408                 panic("ext2_mkdir: blksize");
 1409         else {
 1410                 ip->i_size = DIRBLKSIZ;
 1411                 ip->i_flag |= IN_CHANGE;
 1412         }
 1413 
 1414 #ifdef UFS_ACL
 1415         if (dvp->v_mount->mnt_flag & MNT_ACLS) {
 1416                 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
 1417                     cnp->cn_cred, cnp->cn_thread);
 1418                 if (error)
 1419                         goto bad;
 1420         }
 1421 
 1422 #endif /* UFS_ACL */
 1423 
 1424         /* Directory set up, now install its entry in the parent directory. */
 1425         error = ext2_direnter(ip, dvp, cnp);
 1426         if (error) {
 1427                 ext2_dec_nlink(dp);
 1428                 dp->i_flag |= IN_CHANGE;
 1429         }
 1430 bad:
 1431         /*
 1432          * No need to do an explicit VOP_TRUNCATE here, vrele will do this
 1433          * for us because we set the link count to 0.
 1434          */
 1435         if (error) {
 1436                 ip->i_nlink = 0;
 1437                 ip->i_flag |= IN_CHANGE;
 1438                 vput(tvp);
 1439         } else
 1440                 *ap->a_vpp = tvp;
 1441 out:
 1442         free(buf, M_TEMP);
 1443         return (error);
 1444 #undef  DIRBLKSIZ
 1445 #define DIRBLKSIZ  DEV_BSIZE
 1446 }
 1447 
 1448 /*
 1449  * Rmdir system call.
 1450  */
 1451 static int
 1452 ext2_rmdir(struct vop_rmdir_args *ap)
 1453 {
 1454         struct vnode *vp = ap->a_vp;
 1455         struct vnode *dvp = ap->a_dvp;
 1456         struct componentname *cnp = ap->a_cnp;
 1457         struct inode *ip, *dp;
 1458         int error;
 1459 
 1460         ip = VTOI(vp);
 1461         dp = VTOI(dvp);
 1462 
 1463         /*
 1464          * Verify the directory is empty (and valid).
 1465          * (Rmdir ".." won't be valid since
 1466          *  ".." will contain a reference to
 1467          *  the current directory and thus be
 1468          *  non-empty.)
 1469          */
 1470         if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
 1471                 error = ENOTEMPTY;
 1472                 goto out;
 1473         }
 1474         if ((dp->i_flags & APPEND)
 1475             || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
 1476                 error = EPERM;
 1477                 goto out;
 1478         }
 1479         /*
 1480          * Delete reference to directory before purging
 1481          * inode.  If we crash in between, the directory
 1482          * will be reattached to lost+found,
 1483          */
 1484         error = ext2_dirremove(dvp, cnp);
 1485         if (error)
 1486                 goto out;
 1487         ext2_dec_nlink(dp);
 1488         dp->i_flag |= IN_CHANGE;
 1489         cache_purge(dvp);
 1490         VOP_UNLOCK(dvp);
 1491         /*
 1492          * Truncate inode.  The only stuff left
 1493          * in the directory is "." and "..".
 1494          */
 1495         ip->i_nlink = 0;
 1496         error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
 1497             cnp->cn_thread);
 1498         cache_purge(ITOV(ip));
 1499         if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
 1500                 VOP_UNLOCK(vp);
 1501                 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
 1502                 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 1503         }
 1504 out:
 1505         return (error);
 1506 }
 1507 
 1508 /*
 1509  * symlink -- make a symbolic link
 1510  */
 1511 static int
 1512 ext2_symlink(struct vop_symlink_args *ap)
 1513 {
 1514         struct vnode *vp, **vpp = ap->a_vpp;
 1515         struct inode *ip;
 1516         int len, error;
 1517 
 1518         error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
 1519             vpp, ap->a_cnp);
 1520         if (error)
 1521                 return (error);
 1522         vp = *vpp;
 1523         len = strlen(ap->a_target);
 1524         if (len < vp->v_mount->mnt_maxsymlinklen) {
 1525                 ip = VTOI(vp);
 1526                 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
 1527                 ip->i_size = len;
 1528                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
 1529         } else
 1530                 error = vn_rdwr(UIO_WRITE, vp, __DECONST(void *, ap->a_target),
 1531                     len, (off_t)0, UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
 1532                     ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
 1533         if (error)
 1534                 vput(vp);
 1535         return (error);
 1536 }
 1537 
 1538 /*
 1539  * Return target name of a symbolic link
 1540  */
 1541 static int
 1542 ext2_readlink(struct vop_readlink_args *ap)
 1543 {
 1544         struct vnode *vp = ap->a_vp;
 1545         struct inode *ip = VTOI(vp);
 1546         int isize;
 1547 
 1548         isize = ip->i_size;
 1549         if (isize < vp->v_mount->mnt_maxsymlinklen) {
 1550                 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
 1551                 return (0);
 1552         }
 1553         return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
 1554 }
 1555 
 1556 /*
 1557  * Calculate the logical to physical mapping if not done already,
 1558  * then call the device strategy routine.
 1559  *
 1560  * In order to be able to swap to a file, the ext2_bmaparray() operation may not
 1561  * deadlock on memory.  See ext2_bmap() for details.
 1562  */
 1563 static int
 1564 ext2_strategy(struct vop_strategy_args *ap)
 1565 {
 1566         struct buf *bp = ap->a_bp;
 1567         struct vnode *vp = ap->a_vp;
 1568         struct bufobj *bo;
 1569         daddr_t blkno;
 1570         int error;
 1571 
 1572         if (vp->v_type == VBLK || vp->v_type == VCHR)
 1573                 panic("ext2_strategy: spec");
 1574         if (bp->b_blkno == bp->b_lblkno) {
 1575                 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS)
 1576                         error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL);
 1577                 else
 1578                         error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
 1579 
 1580                 bp->b_blkno = blkno;
 1581                 if (error) {
 1582                         bp->b_error = error;
 1583                         bp->b_ioflags |= BIO_ERROR;
 1584                         bufdone(bp);
 1585                         return (0);
 1586                 }
 1587                 if ((long)bp->b_blkno == -1)
 1588                         vfs_bio_clrbuf(bp);
 1589         }
 1590         if ((long)bp->b_blkno == -1) {
 1591                 bufdone(bp);
 1592                 return (0);
 1593         }
 1594         bp->b_iooffset = dbtob(bp->b_blkno);
 1595         bo = VFSTOEXT2(vp->v_mount)->um_bo;
 1596         BO_STRATEGY(bo, bp);
 1597         return (0);
 1598 }
 1599 
 1600 /*
 1601  * Print out the contents of an inode.
 1602  */
 1603 static int
 1604 ext2_print(struct vop_print_args *ap)
 1605 {
 1606         struct vnode *vp = ap->a_vp;
 1607         struct inode *ip = VTOI(vp);
 1608 
 1609         vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number);
 1610         if (vp->v_type == VFIFO)
 1611                 fifo_printinfo(vp);
 1612         printf("\n");
 1613         return (0);
 1614 }
 1615 
 1616 /*
 1617  * Close wrapper for fifos.
 1618  *
 1619  * Update the times on the inode then do device close.
 1620  */
 1621 static int
 1622 ext2fifo_close(struct vop_close_args *ap)
 1623 {
 1624         struct vnode *vp = ap->a_vp;
 1625 
 1626         VI_LOCK(vp);
 1627         if (vp->v_usecount > 1)
 1628                 ext2_itimes_locked(vp);
 1629         VI_UNLOCK(vp);
 1630         return (fifo_specops.vop_close(ap));
 1631 }
 1632 
 1633 /*
 1634  * Kqfilter wrapper for fifos.
 1635  *
 1636  * Fall through to ext2 kqfilter routines if needed
 1637  */
 1638 static int
 1639 ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
 1640 {
 1641         int error;
 1642 
 1643         error = fifo_specops.vop_kqfilter(ap);
 1644         if (error)
 1645                 error = vfs_kqfilter(ap);
 1646         return (error);
 1647 }
 1648 
 1649 /*
 1650  * Return POSIX pathconf information applicable to ext2 filesystems.
 1651  */
 1652 static int
 1653 ext2_pathconf(struct vop_pathconf_args *ap)
 1654 {
 1655         int error = 0;
 1656 
 1657         switch (ap->a_name) {
 1658         case _PC_LINK_MAX:
 1659                 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs,
 1660                     EXT2F_ROCOMPAT_DIR_NLINK))
 1661                         *ap->a_retval = INT_MAX;
 1662                 else
 1663                         *ap->a_retval = EXT4_LINK_MAX;
 1664                 break;
 1665         case _PC_NAME_MAX:
 1666                 *ap->a_retval = NAME_MAX;
 1667                 break;
 1668         case _PC_PIPE_BUF:
 1669                 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
 1670                         *ap->a_retval = PIPE_BUF;
 1671                 else
 1672                         error = EINVAL;
 1673                 break;
 1674         case _PC_CHOWN_RESTRICTED:
 1675                 *ap->a_retval = 1;
 1676                 break;
 1677         case _PC_NO_TRUNC:
 1678                 *ap->a_retval = 1;
 1679                 break;
 1680 
 1681 #ifdef UFS_ACL
 1682         case _PC_ACL_EXTENDED:
 1683                 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
 1684                         *ap->a_retval = 1;
 1685                 else
 1686                         *ap->a_retval = 0;
 1687                 break;
 1688         case _PC_ACL_PATH_MAX:
 1689                 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
 1690                         *ap->a_retval = ACL_MAX_ENTRIES;
 1691                 else
 1692                         *ap->a_retval = 3;
 1693                 break;
 1694 #endif /* UFS_ACL */
 1695 
 1696         case _PC_MIN_HOLE_SIZE:
 1697                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 1698                 break;
 1699         case _PC_PRIO_IO:
 1700                 *ap->a_retval = 0;
 1701                 break;
 1702         case _PC_SYNC_IO:
 1703                 *ap->a_retval = 0;
 1704                 break;
 1705         case _PC_ALLOC_SIZE_MIN:
 1706                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
 1707                 break;
 1708         case _PC_FILESIZEBITS:
 1709                 *ap->a_retval = 64;
 1710                 break;
 1711         case _PC_REC_INCR_XFER_SIZE:
 1712                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 1713                 break;
 1714         case _PC_REC_MAX_XFER_SIZE:
 1715                 *ap->a_retval = -1;     /* means ``unlimited'' */
 1716                 break;
 1717         case _PC_REC_MIN_XFER_SIZE:
 1718                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 1719                 break;
 1720         case _PC_REC_XFER_ALIGN:
 1721                 *ap->a_retval = PAGE_SIZE;
 1722                 break;
 1723         case _PC_SYMLINK_MAX:
 1724                 *ap->a_retval = MAXPATHLEN;
 1725                 break;
 1726 
 1727         default:
 1728                 error = vop_stdpathconf(ap);
 1729                 break;
 1730         }
 1731         return (error);
 1732 }
 1733 
 1734 /*
 1735  * Vnode operation to remove a named attribute.
 1736  */
 1737 static int
 1738 ext2_deleteextattr(struct vop_deleteextattr_args *ap)
 1739 {
 1740         struct inode *ip;
 1741         struct m_ext2fs *fs;
 1742         int error;
 1743 
 1744         ip = VTOI(ap->a_vp);
 1745         fs = ip->i_e2fs;
 1746 
 1747         if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
 1748                 return (EOPNOTSUPP);
 1749 
 1750         if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
 1751                 return (EOPNOTSUPP);
 1752 
 1753         error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
 1754             ap->a_cred, ap->a_td, VWRITE);
 1755         if (error)
 1756                 return (error);
 1757 
 1758         error = ENOATTR;
 1759 
 1760         if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
 1761                 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name);
 1762                 if (error != ENOATTR)
 1763                         return (error);
 1764         }
 1765 
 1766         if (ip->i_facl)
 1767                 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name);
 1768 
 1769         return (error);
 1770 }
 1771 
 1772 /*
 1773  * Vnode operation to retrieve a named extended attribute.
 1774  */
 1775 static int
 1776 ext2_getextattr(struct vop_getextattr_args *ap)
 1777 {
 1778         struct inode *ip;
 1779         struct m_ext2fs *fs;
 1780         int error;
 1781 
 1782         ip = VTOI(ap->a_vp);
 1783         fs = ip->i_e2fs;
 1784 
 1785         if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
 1786                 return (EOPNOTSUPP);
 1787 
 1788         if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
 1789                 return (EOPNOTSUPP);
 1790 
 1791         error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
 1792             ap->a_cred, ap->a_td, VREAD);
 1793         if (error)
 1794                 return (error);
 1795 
 1796         if (ap->a_size != NULL)
 1797                 *ap->a_size = 0;
 1798 
 1799         error = ENOATTR;
 1800 
 1801         if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
 1802                 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace,
 1803                     ap->a_name, ap->a_uio, ap->a_size);
 1804                 if (error != ENOATTR)
 1805                         return (error);
 1806         }
 1807 
 1808         if (ip->i_facl)
 1809                 error = ext2_extattr_block_get(ip, ap->a_attrnamespace,
 1810                     ap->a_name, ap->a_uio, ap->a_size);
 1811 
 1812         return (error);
 1813 }
 1814 
 1815 /*
 1816  * Vnode operation to retrieve extended attributes on a vnode.
 1817  */
 1818 static int
 1819 ext2_listextattr(struct vop_listextattr_args *ap)
 1820 {
 1821         struct inode *ip;
 1822         struct m_ext2fs *fs;
 1823         int error;
 1824 
 1825         ip = VTOI(ap->a_vp);
 1826         fs = ip->i_e2fs;
 1827 
 1828         if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
 1829                 return (EOPNOTSUPP);
 1830 
 1831         if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
 1832                 return (EOPNOTSUPP);
 1833 
 1834         error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
 1835             ap->a_cred, ap->a_td, VREAD);
 1836         if (error)
 1837                 return (error);
 1838 
 1839         if (ap->a_size != NULL)
 1840                 *ap->a_size = 0;
 1841 
 1842         if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
 1843                 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace,
 1844                     ap->a_uio, ap->a_size);
 1845                 if (error)
 1846                         return (error);
 1847         }
 1848 
 1849         if (ip->i_facl)
 1850                 error = ext2_extattr_block_list(ip, ap->a_attrnamespace,
 1851                     ap->a_uio, ap->a_size);
 1852 
 1853         return (error);
 1854 }
 1855 
 1856 /*
 1857  * Vnode operation to set a named attribute.
 1858  */
 1859 static int
 1860 ext2_setextattr(struct vop_setextattr_args *ap)
 1861 {
 1862         struct inode *ip;
 1863         struct m_ext2fs *fs;
 1864         int error;
 1865 
 1866         ip = VTOI(ap->a_vp);
 1867         fs = ip->i_e2fs;
 1868 
 1869         if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
 1870                 return (EOPNOTSUPP);
 1871 
 1872         if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
 1873                 return (EOPNOTSUPP);
 1874 
 1875         error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
 1876             ap->a_cred, ap->a_td, VWRITE);
 1877         if (error)
 1878                 return (error);
 1879 
 1880         error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name);
 1881         if (error)
 1882                 return (error);
 1883 
 1884         if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
 1885                 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace,
 1886                     ap->a_name, ap->a_uio);
 1887                 if (error != ENOSPC)
 1888                         return (error);
 1889         }
 1890 
 1891         error = ext2_extattr_block_set(ip, ap->a_attrnamespace,
 1892             ap->a_name, ap->a_uio);
 1893 
 1894         return (error);
 1895 }
 1896 
 1897 /*
 1898  * Vnode pointer to File handle
 1899  */
 1900 /* ARGSUSED */
 1901 static int
 1902 ext2_vptofh(struct vop_vptofh_args *ap)
 1903 {
 1904         struct inode *ip;
 1905         struct ufid *ufhp;
 1906 
 1907         ip = VTOI(ap->a_vp);
 1908         ufhp = (struct ufid *)ap->a_fhp;
 1909         ufhp->ufid_len = sizeof(struct ufid);
 1910         ufhp->ufid_ino = ip->i_number;
 1911         ufhp->ufid_gen = ip->i_gen;
 1912         return (0);
 1913 }
 1914 
 1915 /*
 1916  * Initialize the vnode associated with a new inode, handle aliased
 1917  * vnodes.
 1918  */
 1919 int
 1920 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
 1921 {
 1922         struct inode *ip;
 1923         struct vnode *vp;
 1924 
 1925         vp = *vpp;
 1926         ip = VTOI(vp);
 1927         vp->v_type = IFTOVT(ip->i_mode);
 1928         /*
 1929          * Only unallocated inodes should be of type VNON.
 1930          */
 1931         if (ip->i_mode != 0 && vp->v_type == VNON)
 1932                 return (EINVAL);
 1933         if (vp->v_type == VFIFO)
 1934                 vp->v_op = fifoops;
 1935 
 1936         if (ip->i_number == EXT2_ROOTINO)
 1937                 vp->v_vflag |= VV_ROOT;
 1938         ip->i_modrev = init_va_filerev();
 1939         *vpp = vp;
 1940         return (0);
 1941 }
 1942 
 1943 /*
 1944  * Allocate a new inode.
 1945  */
 1946 static int
 1947 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
 1948     struct componentname *cnp)
 1949 {
 1950         struct inode *ip, *pdir;
 1951         struct vnode *tvp;
 1952         int error;
 1953 
 1954         pdir = VTOI(dvp);
 1955 #ifdef INVARIANTS
 1956         if ((cnp->cn_flags & HASBUF) == 0)
 1957                 panic("ext2_makeinode: no name");
 1958 #endif
 1959         *vpp = NULL;
 1960         if ((mode & IFMT) == 0)
 1961                 mode |= IFREG;
 1962 
 1963         error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
 1964         if (error) {
 1965                 return (error);
 1966         }
 1967         ip = VTOI(tvp);
 1968         ip->i_gid = pdir->i_gid;
 1969 #ifdef SUIDDIR
 1970         {
 1971                 /*
 1972                  * if we are
 1973                  * not the owner of the directory,
 1974                  * and we are hacking owners here, (only do this where told to)
 1975                  * and we are not giving it TOO root, (would subvert quotas)
 1976                  * then go ahead and give it to the other user.
 1977                  * Note that this drops off the execute bits for security.
 1978                  */
 1979                 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
 1980                     (pdir->i_mode & ISUID) &&
 1981                     (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
 1982                         ip->i_uid = pdir->i_uid;
 1983                         mode &= ~07111;
 1984                 } else {
 1985                         ip->i_uid = cnp->cn_cred->cr_uid;
 1986                 }
 1987         }
 1988 #else
 1989         ip->i_uid = cnp->cn_cred->cr_uid;
 1990 #endif
 1991         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
 1992         ip->i_mode = mode;
 1993         tvp->v_type = IFTOVT(mode);     /* Rest init'd in getnewvnode(). */
 1994         ip->i_nlink = 1;
 1995         if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
 1996                 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID))
 1997                         ip->i_mode &= ~ISGID;
 1998         }
 1999 
 2000         if (cnp->cn_flags & ISWHITEOUT)
 2001                 ip->i_flags |= UF_OPAQUE;
 2002 
 2003         /*
 2004          * Make sure inode goes to disk before directory entry.
 2005          */
 2006         error = ext2_update(tvp, !DOINGASYNC(tvp));
 2007         if (error)
 2008                 goto bad;
 2009 
 2010 #ifdef UFS_ACL
 2011         if (dvp->v_mount->mnt_flag & MNT_ACLS) {
 2012                 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
 2013                     cnp->cn_cred, cnp->cn_thread);
 2014                 if (error)
 2015                         goto bad;
 2016         }
 2017 #endif /* UFS_ACL */
 2018 
 2019         error = ext2_direnter(ip, dvp, cnp);
 2020         if (error)
 2021                 goto bad;
 2022 
 2023         *vpp = tvp;
 2024         return (0);
 2025 
 2026 bad:
 2027         /*
 2028          * Write error occurred trying to update the inode
 2029          * or the directory so must deallocate the inode.
 2030          */
 2031         ip->i_nlink = 0;
 2032         ip->i_flag |= IN_CHANGE;
 2033         vput(tvp);
 2034         return (error);
 2035 }
 2036 
 2037 /*
 2038  * Vnode op for reading.
 2039  */
 2040 static int
 2041 ext2_read(struct vop_read_args *ap)
 2042 {
 2043         struct vnode *vp;
 2044         struct inode *ip;
 2045         struct uio *uio;
 2046         struct m_ext2fs *fs;
 2047         struct buf *bp;
 2048         daddr_t lbn, nextlbn;
 2049         off_t bytesinfile;
 2050         long size, xfersize, blkoffset;
 2051         int error, orig_resid, seqcount;
 2052         int ioflag;
 2053 
 2054         vp = ap->a_vp;
 2055         uio = ap->a_uio;
 2056         ioflag = ap->a_ioflag;
 2057 
 2058         seqcount = ap->a_ioflag >> IO_SEQSHIFT;
 2059         ip = VTOI(vp);
 2060 
 2061 #ifdef INVARIANTS
 2062         if (uio->uio_rw != UIO_READ)
 2063                 panic("%s: mode", "ext2_read");
 2064 
 2065         if (vp->v_type == VLNK) {
 2066                 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
 2067                         panic("%s: short symlink", "ext2_read");
 2068         } else if (vp->v_type != VREG && vp->v_type != VDIR)
 2069                 panic("%s: type %d", "ext2_read", vp->v_type);
 2070 #endif
 2071         orig_resid = uio->uio_resid;
 2072         KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
 2073         if (orig_resid == 0)
 2074                 return (0);
 2075         KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
 2076         fs = ip->i_e2fs;
 2077         if (uio->uio_offset < ip->i_size &&
 2078             uio->uio_offset >= fs->e2fs_maxfilesize)
 2079                 return (EOVERFLOW);
 2080 
 2081         for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
 2082                 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
 2083                         break;
 2084                 lbn = lblkno(fs, uio->uio_offset);
 2085                 nextlbn = lbn + 1;
 2086                 size = blksize(fs, ip, lbn);
 2087                 blkoffset = blkoff(fs, uio->uio_offset);
 2088 
 2089                 xfersize = fs->e2fs_fsize - blkoffset;
 2090                 if (uio->uio_resid < xfersize)
 2091                         xfersize = uio->uio_resid;
 2092                 if (bytesinfile < xfersize)
 2093                         xfersize = bytesinfile;
 2094 
 2095                 if (lblktosize(fs, nextlbn) >= ip->i_size)
 2096                         error = bread(vp, lbn, size, NOCRED, &bp);
 2097                 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
 2098                         error = cluster_read(vp, ip->i_size, lbn, size,
 2099                             NOCRED, blkoffset + uio->uio_resid, seqcount,
 2100                             0, &bp);
 2101                 } else if (seqcount > 1) {
 2102                         u_int nextsize = blksize(fs, ip, nextlbn);
 2103 
 2104                         error = breadn(vp, lbn,
 2105                             size, &nextlbn, &nextsize, 1, NOCRED, &bp);
 2106                 } else
 2107                         error = bread(vp, lbn, size, NOCRED, &bp);
 2108                 if (error) {
 2109                         brelse(bp);
 2110                         bp = NULL;
 2111                         break;
 2112                 }
 2113 
 2114                 /*
 2115                  * We should only get non-zero b_resid when an I/O error
 2116                  * has occurred, which should cause us to break above.
 2117                  * However, if the short read did not cause an error,
 2118                  * then we want to ensure that we do not uiomove bad
 2119                  * or uninitialized data.
 2120                  */
 2121                 size -= bp->b_resid;
 2122                 if (size < xfersize) {
 2123                         if (size == 0)
 2124                                 break;
 2125                         xfersize = size;
 2126                 }
 2127                 error = uiomove((char *)bp->b_data + blkoffset,
 2128                     (int)xfersize, uio);
 2129                 if (error)
 2130                         break;
 2131                 vfs_bio_brelse(bp, ioflag);
 2132         }
 2133 
 2134         /*
 2135          * This can only happen in the case of an error because the loop
 2136          * above resets bp to NULL on each iteration and on normal
 2137          * completion has not set a new value into it. so it must have come
 2138          * from a 'break' statement
 2139          */
 2140         if (bp != NULL)
 2141                 vfs_bio_brelse(bp, ioflag);
 2142 
 2143         if ((error == 0 || uio->uio_resid != orig_resid) &&
 2144             (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
 2145                 ip->i_flag |= IN_ACCESS;
 2146         return (error);
 2147 }
 2148 
 2149 static int
 2150 ext2_ioctl(struct vop_ioctl_args *ap)
 2151 {
 2152         struct vnode *vp;
 2153         int error;
 2154 
 2155         vp = ap->a_vp;
 2156         switch (ap->a_command) {
 2157         case FIOSEEKDATA:
 2158                 if (!(VTOI(vp)->i_flag & IN_E4EXTENTS)) {
 2159                         error = vn_lock(vp, LK_SHARED);
 2160                         if (error == 0) {
 2161                                 error = ext2_bmap_seekdata(vp,
 2162                                     (off_t *)ap->a_data);
 2163                                 VOP_UNLOCK(vp);
 2164                         } else
 2165                                 error = EBADF;
 2166                         return (error);
 2167                 }
 2168         case FIOSEEKHOLE:
 2169                 return (vn_bmap_seekhole(vp, ap->a_command,
 2170                     (off_t *)ap->a_data, ap->a_cred));
 2171         default:
 2172                 return (ENOTTY);
 2173         }
 2174 }
 2175 
 2176 /*
 2177  * Vnode op for writing.
 2178  */
 2179 static int
 2180 ext2_write(struct vop_write_args *ap)
 2181 {
 2182         struct vnode *vp;
 2183         struct uio *uio;
 2184         struct inode *ip;
 2185         struct m_ext2fs *fs;
 2186         struct buf *bp;
 2187         daddr_t lbn;
 2188         off_t osize;
 2189         int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
 2190 
 2191         ioflag = ap->a_ioflag;
 2192         uio = ap->a_uio;
 2193         vp = ap->a_vp;
 2194 
 2195         seqcount = ioflag >> IO_SEQSHIFT;
 2196         ip = VTOI(vp);
 2197 
 2198 #ifdef INVARIANTS
 2199         if (uio->uio_rw != UIO_WRITE)
 2200                 panic("%s: mode", "ext2_write");
 2201 #endif
 2202 
 2203         switch (vp->v_type) {
 2204         case VREG:
 2205                 if (ioflag & IO_APPEND)
 2206                         uio->uio_offset = ip->i_size;
 2207                 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
 2208                         return (EPERM);
 2209                 /* FALLTHROUGH */
 2210         case VLNK:
 2211                 break;
 2212         case VDIR:
 2213                 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
 2214                 if ((ioflag & IO_SYNC) == 0)
 2215                         panic("ext2_write: nonsync dir write");
 2216                 break;
 2217         default:
 2218                 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
 2219                     vp->v_type, (intmax_t)uio->uio_offset,
 2220                     (intmax_t)uio->uio_resid);
 2221         }
 2222 
 2223         KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
 2224         KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
 2225         fs = ip->i_e2fs;
 2226         if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
 2227                 return (EFBIG);
 2228         /*
 2229          * Maybe this should be above the vnode op call, but so long as
 2230          * file servers have no limits, I don't think it matters.
 2231          */
 2232         if (vn_rlimit_fsize(vp, uio, uio->uio_td))
 2233                 return (EFBIG);
 2234 
 2235         resid = uio->uio_resid;
 2236         osize = ip->i_size;
 2237         if (seqcount > BA_SEQMAX)
 2238                 flags = BA_SEQMAX << BA_SEQSHIFT;
 2239         else
 2240                 flags = seqcount << BA_SEQSHIFT;
 2241         if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
 2242                 flags |= IO_SYNC;
 2243 
 2244         for (error = 0; uio->uio_resid > 0;) {
 2245                 lbn = lblkno(fs, uio->uio_offset);
 2246                 blkoffset = blkoff(fs, uio->uio_offset);
 2247                 xfersize = fs->e2fs_fsize - blkoffset;
 2248                 if (uio->uio_resid < xfersize)
 2249                         xfersize = uio->uio_resid;
 2250                 if (uio->uio_offset + xfersize > ip->i_size)
 2251                         vnode_pager_setsize(vp, uio->uio_offset + xfersize);
 2252 
 2253                 /*
 2254                  * We must perform a read-before-write if the transfer size
 2255                  * does not cover the entire buffer.
 2256                  */
 2257                 if (fs->e2fs_bsize > xfersize)
 2258                         flags |= BA_CLRBUF;
 2259                 else
 2260                         flags &= ~BA_CLRBUF;
 2261                 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
 2262                     ap->a_cred, &bp, flags);
 2263                 if (error != 0)
 2264                         break;
 2265 
 2266                 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL))
 2267                         bp->b_flags |= B_NOCACHE;
 2268                 if (uio->uio_offset + xfersize > ip->i_size)
 2269                         ip->i_size = uio->uio_offset + xfersize;
 2270                 size = blksize(fs, ip, lbn) - bp->b_resid;
 2271                 if (size < xfersize)
 2272                         xfersize = size;
 2273 
 2274                 error =
 2275                     uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
 2276                 /*
 2277                  * If the buffer is not already filled and we encounter an
 2278                  * error while trying to fill it, we have to clear out any
 2279                  * garbage data from the pages instantiated for the buffer.
 2280                  * If we do not, a failed uiomove() during a write can leave
 2281                  * the prior contents of the pages exposed to a userland mmap.
 2282                  *
 2283                  * Note that we need only clear buffers with a transfer size
 2284                  * equal to the block size because buffers with a shorter
 2285                  * transfer size were cleared above by the call to ext2_balloc()
 2286                  * with the BA_CLRBUF flag set.
 2287                  *
 2288                  * If the source region for uiomove identically mmaps the
 2289                  * buffer, uiomove() performed the NOP copy, and the buffer
 2290                  * content remains valid because the page fault handler
 2291                  * validated the pages.
 2292                  */
 2293                 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
 2294                     fs->e2fs_bsize == xfersize)
 2295                         vfs_bio_clrbuf(bp);
 2296 
 2297                 vfs_bio_set_flags(bp, ioflag);
 2298 
 2299                 /*
 2300                  * If IO_SYNC each buffer is written synchronously.  Otherwise
 2301                  * if we have a severe page deficiency write the buffer
 2302                  * asynchronously.  Otherwise try to cluster, and if that
 2303                  * doesn't do it then either do an async write (if O_DIRECT),
 2304                  * or a delayed write (if not).
 2305                  */
 2306                 if (ioflag & IO_SYNC) {
 2307                         (void)bwrite(bp);
 2308                 } else if (vm_page_count_severe() ||
 2309                             buf_dirty_count_severe() ||
 2310                     (ioflag & IO_ASYNC)) {
 2311                         bp->b_flags |= B_CLUSTEROK;
 2312                         bawrite(bp);
 2313                 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
 2314                         if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
 2315                                 bp->b_flags |= B_CLUSTEROK;
 2316                                 cluster_write(vp, bp, ip->i_size, seqcount, 0);
 2317                         } else {
 2318                                 bawrite(bp);
 2319                         }
 2320                 } else if (ioflag & IO_DIRECT) {
 2321                         bp->b_flags |= B_CLUSTEROK;
 2322                         bawrite(bp);
 2323                 } else {
 2324                         bp->b_flags |= B_CLUSTEROK;
 2325                         bdwrite(bp);
 2326                 }
 2327                 if (error || xfersize == 0)
 2328                         break;
 2329         }
 2330         /*
 2331          * If we successfully wrote any data, and we are not the superuser
 2332          * we clear the setuid and setgid bits as a precaution against
 2333          * tampering.
 2334          */
 2335         if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
 2336             ap->a_cred) {
 2337                 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID))
 2338                         ip->i_mode &= ~(ISUID | ISGID);
 2339         }
 2340         if (error) {
 2341                 if (ioflag & IO_UNIT) {
 2342                         (void)ext2_truncate(vp, osize,
 2343                             ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
 2344                         uio->uio_offset -= resid - uio->uio_resid;
 2345                         uio->uio_resid = resid;
 2346                 }
 2347         }
 2348         if (uio->uio_resid != resid) {
 2349                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
 2350                 if (ioflag & IO_SYNC)
 2351                         error = ext2_update(vp, 1);
 2352         }
 2353         return (error);
 2354 }

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