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: releng/12.0/sys/fs/ext2fs/ext2_vnops.c 338150 2018-08-21 18:39:02Z fsu $
   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/stat.h>
   55 #include <sys/bio.h>
   56 #include <sys/buf.h>
   57 #include <sys/endian.h>
   58 #include <sys/priv.h>
   59 #include <sys/rwlock.h>
   60 #include <sys/mount.h>
   61 #include <sys/unistd.h>
   62 #include <sys/time.h>
   63 #include <sys/vnode.h>
   64 #include <sys/namei.h>
   65 #include <sys/lockf.h>
   66 #include <sys/event.h>
   67 #include <sys/conf.h>
   68 #include <sys/file.h>
   69 #include <sys/extattr.h>
   70 #include <sys/vmmeter.h>
   71 
   72 #include <vm/vm.h>
   73 #include <vm/vm_param.h>
   74 #include <vm/vm_extern.h>
   75 #include <vm/vm_object.h>
   76 #include <vm/vm_page.h>
   77 #include <vm/vm_pager.h>
   78 #include <vm/vnode_pager.h>
   79 
   80 #include "opt_directio.h"
   81 
   82 #include <ufs/ufs/dir.h>
   83 
   84 #include <fs/ext2fs/fs.h>
   85 #include <fs/ext2fs/inode.h>
   86 #include <fs/ext2fs/ext2_acl.h>
   87 #include <fs/ext2fs/ext2fs.h>
   88 #include <fs/ext2fs/ext2_extern.h>
   89 #include <fs/ext2fs/ext2_dinode.h>
   90 #include <fs/ext2fs/ext2_dir.h>
   91 #include <fs/ext2fs/ext2_mount.h>
   92 #include <fs/ext2fs/ext2_extattr.h>
   93 #include <fs/ext2fs/ext2_extents.h>
   94 
   95 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
   96 static void ext2_itimes_locked(struct vnode *);
   97 
   98 static vop_access_t     ext2_access;
   99 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
  100 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
  101     struct thread *);
  102 static vop_close_t      ext2_close;
  103 static vop_create_t     ext2_create;
  104 static vop_fsync_t      ext2_fsync;
  105 static vop_getattr_t    ext2_getattr;
  106 static vop_ioctl_t      ext2_ioctl;
  107 static vop_link_t       ext2_link;
  108 static vop_mkdir_t      ext2_mkdir;
  109 static vop_mknod_t      ext2_mknod;
  110 static vop_open_t       ext2_open;
  111 static vop_pathconf_t   ext2_pathconf;
  112 static vop_print_t      ext2_print;
  113 static vop_read_t       ext2_read;
  114 static vop_readlink_t   ext2_readlink;
  115 static vop_remove_t     ext2_remove;
  116 static vop_rename_t     ext2_rename;
  117 static vop_rmdir_t      ext2_rmdir;
  118 static vop_setattr_t    ext2_setattr;
  119 static vop_strategy_t   ext2_strategy;
  120 static vop_symlink_t    ext2_symlink;
  121 static vop_write_t      ext2_write;
  122 static vop_deleteextattr_t      ext2_deleteextattr;
  123 static vop_getextattr_t ext2_getextattr;
  124 static vop_listextattr_t        ext2_listextattr;
  125 static vop_setextattr_t ext2_setextattr;
  126 static vop_vptofh_t     ext2_vptofh;
  127 static vop_close_t      ext2fifo_close;
  128 static vop_kqfilter_t   ext2fifo_kqfilter;
  129 
  130 /* Global vfs data structures for ext2. */
  131 struct vop_vector ext2_vnodeops = {
  132         .vop_default =          &default_vnodeops,
  133         .vop_access =           ext2_access,
  134         .vop_bmap =             ext2_bmap,
  135         .vop_cachedlookup =     ext2_lookup,
  136         .vop_close =            ext2_close,
  137         .vop_create =           ext2_create,
  138         .vop_fsync =            ext2_fsync,
  139         .vop_getpages =         vnode_pager_local_getpages,
  140         .vop_getpages_async =   vnode_pager_local_getpages_async,
  141         .vop_getattr =          ext2_getattr,
  142         .vop_inactive =         ext2_inactive,
  143         .vop_ioctl =            ext2_ioctl,
  144         .vop_link =             ext2_link,
  145         .vop_lookup =           vfs_cache_lookup,
  146         .vop_mkdir =            ext2_mkdir,
  147         .vop_mknod =            ext2_mknod,
  148         .vop_open =             ext2_open,
  149         .vop_pathconf =         ext2_pathconf,
  150         .vop_poll =             vop_stdpoll,
  151         .vop_print =            ext2_print,
  152         .vop_read =             ext2_read,
  153         .vop_readdir =          ext2_readdir,
  154         .vop_readlink =         ext2_readlink,
  155         .vop_reallocblks =      ext2_reallocblks,
  156         .vop_reclaim =          ext2_reclaim,
  157         .vop_remove =           ext2_remove,
  158         .vop_rename =           ext2_rename,
  159         .vop_rmdir =            ext2_rmdir,
  160         .vop_setattr =          ext2_setattr,
  161         .vop_strategy =         ext2_strategy,
  162         .vop_symlink =          ext2_symlink,
  163         .vop_write =            ext2_write,
  164         .vop_deleteextattr =    ext2_deleteextattr,
  165         .vop_getextattr =       ext2_getextattr,
  166         .vop_listextattr =      ext2_listextattr,
  167         .vop_setextattr =       ext2_setextattr,
  168 #ifdef UFS_ACL
  169         .vop_getacl =           ext2_getacl,
  170         .vop_setacl =           ext2_setacl,
  171         .vop_aclcheck =         ext2_aclcheck,
  172 #endif /* UFS_ACL */
  173         .vop_vptofh =           ext2_vptofh,
  174 };
  175 
  176 struct vop_vector ext2_fifoops = {
  177         .vop_default =          &fifo_specops,
  178         .vop_access =           ext2_access,
  179         .vop_close =            ext2fifo_close,
  180         .vop_fsync =            ext2_fsync,
  181         .vop_getattr =          ext2_getattr,
  182         .vop_inactive =         ext2_inactive,
  183         .vop_kqfilter =         ext2fifo_kqfilter,
  184         .vop_pathconf =         ext2_pathconf,
  185         .vop_print =            ext2_print,
  186         .vop_read =             VOP_PANIC,
  187         .vop_reclaim =          ext2_reclaim,
  188         .vop_setattr =          ext2_setattr,
  189         .vop_write =            VOP_PANIC,
  190         .vop_vptofh =           ext2_vptofh,
  191 };
  192 
  193 /*
  194  * A virgin directory (no blushing please).
  195  * Note that the type and namlen fields are reversed relative to ext2.
  196  * Also, we don't use `struct odirtemplate', since it would just cause
  197  * endianness problems.
  198  */
  199 static struct dirtemplate mastertemplate = {
  200         0, 12, 1, EXT2_FT_DIR, ".",
  201         0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
  202 };
  203 static struct dirtemplate omastertemplate = {
  204         0, 12, 1, EXT2_FT_UNKNOWN, ".",
  205         0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
  206 };
  207 
  208 static void
  209 ext2_itimes_locked(struct vnode *vp)
  210 {
  211         struct inode *ip;
  212         struct timespec ts;
  213 
  214         ASSERT_VI_LOCKED(vp, __func__);
  215 
  216         ip = VTOI(vp);
  217         if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
  218                 return;
  219         if ((vp->v_type == VBLK || vp->v_type == VCHR))
  220                 ip->i_flag |= IN_LAZYMOD;
  221         else
  222                 ip->i_flag |= IN_MODIFIED;
  223         if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
  224                 vfs_timestamp(&ts);
  225                 if (ip->i_flag & IN_ACCESS) {
  226                         ip->i_atime = ts.tv_sec;
  227                         ip->i_atimensec = ts.tv_nsec;
  228                 }
  229                 if (ip->i_flag & IN_UPDATE) {
  230                         ip->i_mtime = ts.tv_sec;
  231                         ip->i_mtimensec = ts.tv_nsec;
  232                         ip->i_modrev++;
  233                 }
  234                 if (ip->i_flag & IN_CHANGE) {
  235                         ip->i_ctime = ts.tv_sec;
  236                         ip->i_ctimensec = ts.tv_nsec;
  237                 }
  238         }
  239         ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
  240 }
  241 
  242 void
  243 ext2_itimes(struct vnode *vp)
  244 {
  245 
  246         VI_LOCK(vp);
  247         ext2_itimes_locked(vp);
  248         VI_UNLOCK(vp);
  249 }
  250 
  251 /*
  252  * Create a regular file
  253  */
  254 static int
  255 ext2_create(struct vop_create_args *ap)
  256 {
  257         int error;
  258 
  259         error =
  260             ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
  261             ap->a_dvp, ap->a_vpp, ap->a_cnp);
  262         if (error != 0)
  263                 return (error);
  264         if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
  265                 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
  266         return (0);
  267 }
  268 
  269 static int
  270 ext2_open(struct vop_open_args *ap)
  271 {
  272 
  273         if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
  274                 return (EOPNOTSUPP);
  275 
  276         /*
  277          * Files marked append-only must be opened for appending.
  278          */
  279         if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
  280             (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
  281                 return (EPERM);
  282 
  283         vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
  284 
  285         return (0);
  286 }
  287 
  288 /*
  289  * Close called.
  290  *
  291  * Update the times on the inode.
  292  */
  293 static int
  294 ext2_close(struct vop_close_args *ap)
  295 {
  296         struct vnode *vp = ap->a_vp;
  297 
  298         VI_LOCK(vp);
  299         if (vp->v_usecount > 1)
  300                 ext2_itimes_locked(vp);
  301         VI_UNLOCK(vp);
  302         return (0);
  303 }
  304 
  305 static int
  306 ext2_access(struct vop_access_args *ap)
  307 {
  308         struct vnode *vp = ap->a_vp;
  309         struct inode *ip = VTOI(vp);
  310         accmode_t accmode = ap->a_accmode;
  311         int error;
  312 
  313         if (vp->v_type == VBLK || vp->v_type == VCHR)
  314                 return (EOPNOTSUPP);
  315 
  316         /*
  317          * Disallow write attempts on read-only file systems;
  318          * unless the file is a socket, fifo, or a block or
  319          * character device resident on the file system.
  320          */
  321         if (accmode & VWRITE) {
  322                 switch (vp->v_type) {
  323                 case VDIR:
  324                 case VLNK:
  325                 case VREG:
  326                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  327                                 return (EROFS);
  328                         break;
  329                 default:
  330                         break;
  331                 }
  332         }
  333 
  334         /* If immutable bit set, nobody gets to write it. */
  335         if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
  336                 return (EPERM);
  337 
  338         error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
  339             ap->a_accmode, ap->a_cred, NULL);
  340         return (error);
  341 }
  342 
  343 static int
  344 ext2_getattr(struct vop_getattr_args *ap)
  345 {
  346         struct vnode *vp = ap->a_vp;
  347         struct inode *ip = VTOI(vp);
  348         struct vattr *vap = ap->a_vap;
  349 
  350         ext2_itimes(vp);
  351         /*
  352          * Copy from inode table
  353          */
  354         vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
  355         vap->va_fileid = ip->i_number;
  356         vap->va_mode = ip->i_mode & ~IFMT;
  357         vap->va_nlink = ip->i_nlink;
  358         vap->va_uid = ip->i_uid;
  359         vap->va_gid = ip->i_gid;
  360         vap->va_rdev = ip->i_rdev;
  361         vap->va_size = ip->i_size;
  362         vap->va_atime.tv_sec = ip->i_atime;
  363         vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
  364         vap->va_mtime.tv_sec = ip->i_mtime;
  365         vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
  366         vap->va_ctime.tv_sec = ip->i_ctime;
  367         vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
  368         if E2DI_HAS_XTIME(ip) {
  369                 vap->va_birthtime.tv_sec = ip->i_birthtime;
  370                 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
  371         }
  372         vap->va_flags = ip->i_flags;
  373         vap->va_gen = ip->i_gen;
  374         vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
  375         vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
  376         vap->va_type = IFTOVT(ip->i_mode);
  377         vap->va_filerev = ip->i_modrev;
  378         return (0);
  379 }
  380 
  381 /*
  382  * Set attribute vnode op. called from several syscalls
  383  */
  384 static int
  385 ext2_setattr(struct vop_setattr_args *ap)
  386 {
  387         struct vattr *vap = ap->a_vap;
  388         struct vnode *vp = ap->a_vp;
  389         struct inode *ip = VTOI(vp);
  390         struct ucred *cred = ap->a_cred;
  391         struct thread *td = curthread;
  392         int error;
  393 
  394         /*
  395          * Check for unsettable attributes.
  396          */
  397         if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
  398             (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
  399             (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
  400             ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
  401                 return (EINVAL);
  402         }
  403         if (vap->va_flags != VNOVAL) {
  404                 /* Disallow flags not supported by ext2fs. */
  405                 if (vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
  406                         return (EOPNOTSUPP);
  407 
  408                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  409                         return (EROFS);
  410                 /*
  411                  * Callers may only modify the file flags on objects they
  412                  * have VADMIN rights for.
  413                  */
  414                 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  415                         return (error);
  416                 /*
  417                  * Unprivileged processes and privileged processes in
  418                  * jail() are not permitted to unset system flags, or
  419                  * modify flags if any system flags are set.
  420                  * Privileged non-jail processes may not modify system flags
  421                  * if securelevel > 0 and any existing system flags are set.
  422                  */
  423                 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
  424                         if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
  425                                 error = securelevel_gt(cred, 0);
  426                                 if (error)
  427                                         return (error);
  428                         }
  429                 } else {
  430                         if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
  431                             ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
  432                                 return (EPERM);
  433                 }
  434                 ip->i_flags = vap->va_flags;
  435                 ip->i_flag |= IN_CHANGE;
  436                 if (ip->i_flags & (IMMUTABLE | APPEND))
  437                         return (0);
  438         }
  439         if (ip->i_flags & (IMMUTABLE | APPEND))
  440                 return (EPERM);
  441         /*
  442          * Go through the fields and update iff not VNOVAL.
  443          */
  444         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
  445                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  446                         return (EROFS);
  447                 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
  448                     td)) != 0)
  449                         return (error);
  450         }
  451         if (vap->va_size != VNOVAL) {
  452                 /*
  453                  * Disallow write attempts on read-only file systems;
  454                  * unless the file is a socket, fifo, or a block or
  455                  * character device resident on the file system.
  456                  */
  457                 switch (vp->v_type) {
  458                 case VDIR:
  459                         return (EISDIR);
  460                 case VLNK:
  461                 case VREG:
  462                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  463                                 return (EROFS);
  464                         break;
  465                 default:
  466                         break;
  467                 }
  468                 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
  469                         return (error);
  470         }
  471         if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
  472                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  473                         return (EROFS);
  474                 /*
  475                  * From utimes(2):
  476                  * If times is NULL, ... The caller must be the owner of
  477                  * the file, have permission to write the file, or be the
  478                  * super-user.
  479                  * If times is non-NULL, ... The caller must be the owner of
  480                  * the file or be the super-user.
  481                  */
  482                 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
  483                     ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
  484                     (error = VOP_ACCESS(vp, VWRITE, cred, td))))
  485                         return (error);
  486                 ip->i_flag |= IN_CHANGE | IN_MODIFIED;
  487                 if (vap->va_atime.tv_sec != VNOVAL) {
  488                         ip->i_flag &= ~IN_ACCESS;
  489                         ip->i_atime = vap->va_atime.tv_sec;
  490                         ip->i_atimensec = vap->va_atime.tv_nsec;
  491                 }
  492                 if (vap->va_mtime.tv_sec != VNOVAL) {
  493                         ip->i_flag &= ~IN_UPDATE;
  494                         ip->i_mtime = vap->va_mtime.tv_sec;
  495                         ip->i_mtimensec = vap->va_mtime.tv_nsec;
  496                 }
  497                 ip->i_birthtime = vap->va_birthtime.tv_sec;
  498                 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
  499                 error = ext2_update(vp, 0);
  500                 if (error)
  501                         return (error);
  502         }
  503         error = 0;
  504         if (vap->va_mode != (mode_t)VNOVAL) {
  505                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  506                         return (EROFS);
  507                 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
  508         }
  509         return (error);
  510 }
  511 
  512 /*
  513  * Change the mode on a file.
  514  * Inode must be locked before calling.
  515  */
  516 static int
  517 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
  518 {
  519         struct inode *ip = VTOI(vp);
  520         int error;
  521 
  522         /*
  523          * To modify the permissions on a file, must possess VADMIN
  524          * for that file.
  525          */
  526         if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  527                 return (error);
  528         /*
  529          * Privileged processes may set the sticky bit on non-directories,
  530          * as well as set the setgid bit on a file with a group that the
  531          * process is not a member of.
  532          */
  533         if (vp->v_type != VDIR && (mode & S_ISTXT)) {
  534                 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
  535                 if (error)
  536                         return (EFTYPE);
  537         }
  538         if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
  539                 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
  540                 if (error)
  541                         return (error);
  542         }
  543         ip->i_mode &= ~ALLPERMS;
  544         ip->i_mode |= (mode & ALLPERMS);
  545         ip->i_flag |= IN_CHANGE;
  546         return (0);
  547 }
  548 
  549 /*
  550  * Perform chown operation on inode ip;
  551  * inode must be locked prior to call.
  552  */
  553 static int
  554 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
  555     struct thread *td)
  556 {
  557         struct inode *ip = VTOI(vp);
  558         uid_t ouid;
  559         gid_t ogid;
  560         int error = 0;
  561 
  562         if (uid == (uid_t)VNOVAL)
  563                 uid = ip->i_uid;
  564         if (gid == (gid_t)VNOVAL)
  565                 gid = ip->i_gid;
  566         /*
  567          * To modify the ownership of a file, must possess VADMIN
  568          * for that file.
  569          */
  570         if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  571                 return (error);
  572         /*
  573          * To change the owner of a file, or change the group of a file
  574          * to a group of which we are not a member, the caller must
  575          * have privilege.
  576          */
  577         if (uid != ip->i_uid || (gid != ip->i_gid &&
  578             !groupmember(gid, cred))) {
  579                 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
  580                 if (error)
  581                         return (error);
  582         }
  583         ogid = ip->i_gid;
  584         ouid = ip->i_uid;
  585         ip->i_gid = gid;
  586         ip->i_uid = uid;
  587         ip->i_flag |= IN_CHANGE;
  588         if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
  589                 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
  590                         ip->i_mode &= ~(ISUID | ISGID);
  591         }
  592         return (0);
  593 }
  594 
  595 /*
  596  * Synch an open file.
  597  */
  598 /* ARGSUSED */
  599 static int
  600 ext2_fsync(struct vop_fsync_args *ap)
  601 {
  602         /*
  603          * Flush all dirty buffers associated with a vnode.
  604          */
  605 
  606         vop_stdfsync(ap);
  607 
  608         return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
  609 }
  610 
  611 /*
  612  * Mknod vnode call
  613  */
  614 /* ARGSUSED */
  615 static int
  616 ext2_mknod(struct vop_mknod_args *ap)
  617 {
  618         struct vattr *vap = ap->a_vap;
  619         struct vnode **vpp = ap->a_vpp;
  620         struct inode *ip;
  621         ino_t ino;
  622         int error;
  623 
  624         error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
  625             ap->a_dvp, vpp, ap->a_cnp);
  626         if (error)
  627                 return (error);
  628         ip = VTOI(*vpp);
  629         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
  630         if (vap->va_rdev != VNOVAL) {
  631                 /*
  632                  * Want to be able to use this to make badblock
  633                  * inodes, so don't truncate the dev number.
  634                  */
  635                 if (!(ip->i_flag & IN_E4EXTENTS))
  636                         ip->i_rdev = vap->va_rdev;
  637         }
  638         /*
  639          * Remove inode, then reload it through VFS_VGET so it is
  640          * checked to see if it is an alias of an existing entry in
  641          * the inode cache.      XXX I don't believe this is necessary now.
  642          */
  643         (*vpp)->v_type = VNON;
  644         ino = ip->i_number;     /* Save this before vgone() invalidates ip. */
  645         vgone(*vpp);
  646         vput(*vpp);
  647         error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
  648         if (error) {
  649                 *vpp = NULL;
  650                 return (error);
  651         }
  652         return (0);
  653 }
  654 
  655 static int
  656 ext2_remove(struct vop_remove_args *ap)
  657 {
  658         struct inode *ip;
  659         struct vnode *vp = ap->a_vp;
  660         struct vnode *dvp = ap->a_dvp;
  661         int error;
  662 
  663         ip = VTOI(vp);
  664         if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
  665             (VTOI(dvp)->i_flags & APPEND)) {
  666                 error = EPERM;
  667                 goto out;
  668         }
  669         error = ext2_dirremove(dvp, ap->a_cnp);
  670         if (error == 0) {
  671                 ip->i_nlink--;
  672                 ip->i_flag |= IN_CHANGE;
  673         }
  674 out:
  675         return (error);
  676 }
  677 
  678 /*
  679  * link vnode call
  680  */
  681 static int
  682 ext2_link(struct vop_link_args *ap)
  683 {
  684         struct vnode *vp = ap->a_vp;
  685         struct vnode *tdvp = ap->a_tdvp;
  686         struct componentname *cnp = ap->a_cnp;
  687         struct inode *ip;
  688         int error;
  689 
  690 #ifdef INVARIANTS
  691         if ((cnp->cn_flags & HASBUF) == 0)
  692                 panic("ext2_link: no name");
  693 #endif
  694         ip = VTOI(vp);
  695         if ((nlink_t)ip->i_nlink >= EXT4_LINK_MAX) {
  696                 error = EMLINK;
  697                 goto out;
  698         }
  699         if (ip->i_flags & (IMMUTABLE | APPEND)) {
  700                 error = EPERM;
  701                 goto out;
  702         }
  703         ip->i_nlink++;
  704         ip->i_flag |= IN_CHANGE;
  705         error = ext2_update(vp, !DOINGASYNC(vp));
  706         if (!error)
  707                 error = ext2_direnter(ip, tdvp, cnp);
  708         if (error) {
  709                 ip->i_nlink--;
  710                 ip->i_flag |= IN_CHANGE;
  711         }
  712 out:
  713         return (error);
  714 }
  715 
  716 static int
  717 ext2_inc_nlink(struct inode *ip)
  718 {
  719 
  720         ip->i_nlink++;
  721 
  722         if (S_ISDIR(ip->i_mode) &&
  723             EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK) &&
  724             ip->i_nlink > 1) {
  725                 if (ip->i_nlink >= EXT4_LINK_MAX || ip->i_nlink == 2)
  726                         ip->i_nlink = 1;
  727         } else if (ip->i_nlink > EXT4_LINK_MAX) {
  728                 ip->i_nlink--;
  729                 return (EMLINK);
  730         }
  731 
  732         return (0);
  733 }
  734 
  735 static void
  736 ext2_dec_nlink(struct inode *ip)
  737 {
  738 
  739         if (!S_ISDIR(ip->i_mode) || ip->i_nlink > 2)
  740                 ip->i_nlink--;
  741 }
  742 
  743 /*
  744  * Rename system call.
  745  *      rename("foo", "bar");
  746  * is essentially
  747  *      unlink("bar");
  748  *      link("foo", "bar");
  749  *      unlink("foo");
  750  * but ``atomically''.  Can't do full commit without saving state in the
  751  * inode on disk which isn't feasible at this time.  Best we can do is
  752  * always guarantee the target exists.
  753  *
  754  * Basic algorithm is:
  755  *
  756  * 1) Bump link count on source while we're linking it to the
  757  *    target.  This also ensure the inode won't be deleted out
  758  *    from underneath us while we work (it may be truncated by
  759  *    a concurrent `trunc' or `open' for creation).
  760  * 2) Link source to destination.  If destination already exists,
  761  *    delete it first.
  762  * 3) Unlink source reference to inode if still around. If a
  763  *    directory was moved and the parent of the destination
  764  *    is different from the source, patch the ".." entry in the
  765  *    directory.
  766  */
  767 static int
  768 ext2_rename(struct vop_rename_args *ap)
  769 {
  770         struct vnode *tvp = ap->a_tvp;
  771         struct vnode *tdvp = ap->a_tdvp;
  772         struct vnode *fvp = ap->a_fvp;
  773         struct vnode *fdvp = ap->a_fdvp;
  774         struct componentname *tcnp = ap->a_tcnp;
  775         struct componentname *fcnp = ap->a_fcnp;
  776         struct inode *ip, *xp, *dp;
  777         struct dirtemplate *dirbuf;
  778         int doingdirectory = 0, oldparent = 0, newparent = 0;
  779         int error = 0;
  780         u_char namlen;
  781 
  782 #ifdef INVARIANTS
  783         if ((tcnp->cn_flags & HASBUF) == 0 ||
  784             (fcnp->cn_flags & HASBUF) == 0)
  785                 panic("ext2_rename: no name");
  786 #endif
  787         /*
  788          * Check for cross-device rename.
  789          */
  790         if ((fvp->v_mount != tdvp->v_mount) ||
  791             (tvp && (fvp->v_mount != tvp->v_mount))) {
  792                 error = EXDEV;
  793 abortit:
  794                 if (tdvp == tvp)
  795                         vrele(tdvp);
  796                 else
  797                         vput(tdvp);
  798                 if (tvp)
  799                         vput(tvp);
  800                 vrele(fdvp);
  801                 vrele(fvp);
  802                 return (error);
  803         }
  804 
  805         if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
  806             (VTOI(tdvp)->i_flags & APPEND))) {
  807                 error = EPERM;
  808                 goto abortit;
  809         }
  810 
  811         /*
  812          * Renaming a file to itself has no effect.  The upper layers should
  813          * not call us in that case.  Temporarily just warn if they do.
  814          */
  815         if (fvp == tvp) {
  816                 printf("ext2_rename: fvp == tvp (can't happen)\n");
  817                 error = 0;
  818                 goto abortit;
  819         }
  820 
  821         if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
  822                 goto abortit;
  823         dp = VTOI(fdvp);
  824         ip = VTOI(fvp);
  825         if (ip->i_nlink >= EXT4_LINK_MAX &&
  826             !EXT2_HAS_RO_COMPAT_FEATURE(ip->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
  827                 VOP_UNLOCK(fvp, 0);
  828                 error = EMLINK;
  829                 goto abortit;
  830         }
  831         if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
  832             || (dp->i_flags & APPEND)) {
  833                 VOP_UNLOCK(fvp, 0);
  834                 error = EPERM;
  835                 goto abortit;
  836         }
  837         if ((ip->i_mode & IFMT) == IFDIR) {
  838                 /*
  839                  * Avoid ".", "..", and aliases of "." for obvious reasons.
  840                  */
  841                 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
  842                     dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
  843                     (ip->i_flag & IN_RENAME)) {
  844                         VOP_UNLOCK(fvp, 0);
  845                         error = EINVAL;
  846                         goto abortit;
  847                 }
  848                 ip->i_flag |= IN_RENAME;
  849                 oldparent = dp->i_number;
  850                 doingdirectory++;
  851         }
  852         vrele(fdvp);
  853 
  854         /*
  855          * When the target exists, both the directory
  856          * and target vnodes are returned locked.
  857          */
  858         dp = VTOI(tdvp);
  859         xp = NULL;
  860         if (tvp)
  861                 xp = VTOI(tvp);
  862 
  863         /*
  864          * 1) Bump link count while we're moving stuff
  865          *    around.  If we crash somewhere before
  866          *    completing our work, the link count
  867          *    may be wrong, but correctable.
  868          */
  869         ext2_inc_nlink(ip);
  870         ip->i_flag |= IN_CHANGE;
  871         if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
  872                 VOP_UNLOCK(fvp, 0);
  873                 goto bad;
  874         }
  875 
  876         /*
  877          * If ".." must be changed (ie the directory gets a new
  878          * parent) then the source directory must not be in the
  879          * directory hierarchy above the target, as this would
  880          * orphan everything below the source directory. Also
  881          * the user must have write permission in the source so
  882          * as to be able to change "..". We must repeat the call
  883          * to namei, as the parent directory is unlocked by the
  884          * call to checkpath().
  885          */
  886         error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
  887         VOP_UNLOCK(fvp, 0);
  888         if (oldparent != dp->i_number)
  889                 newparent = dp->i_number;
  890         if (doingdirectory && newparent) {
  891                 if (error)      /* write access check above */
  892                         goto bad;
  893                 if (xp != NULL)
  894                         vput(tvp);
  895                 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
  896                 if (error)
  897                         goto out;
  898                 VREF(tdvp);
  899                 error = relookup(tdvp, &tvp, tcnp);
  900                 if (error)
  901                         goto out;
  902                 vrele(tdvp);
  903                 dp = VTOI(tdvp);
  904                 xp = NULL;
  905                 if (tvp)
  906                         xp = VTOI(tvp);
  907         }
  908         /*
  909          * 2) If target doesn't exist, link the target
  910          *    to the source and unlink the source.
  911          *    Otherwise, rewrite the target directory
  912          *    entry to reference the source inode and
  913          *    expunge the original entry's existence.
  914          */
  915         if (xp == NULL) {
  916                 if (dp->i_devvp != ip->i_devvp)
  917                         panic("ext2_rename: EXDEV");
  918                 /*
  919                  * Account for ".." in new directory.
  920                  * When source and destination have the same
  921                  * parent we don't fool with the link count.
  922                  */
  923                 if (doingdirectory && newparent) {
  924                         error = ext2_inc_nlink(dp);
  925                         if (error)
  926                                 goto bad;
  927 
  928                         dp->i_flag |= IN_CHANGE;
  929                         error = ext2_update(tdvp, !DOINGASYNC(tdvp));
  930                         if (error)
  931                                 goto bad;
  932                 }
  933                 error = ext2_direnter(ip, tdvp, tcnp);
  934                 if (error) {
  935                         if (doingdirectory && newparent) {
  936                                 ext2_dec_nlink(dp);
  937                                 dp->i_flag |= IN_CHANGE;
  938                                 (void)ext2_update(tdvp, 1);
  939                         }
  940                         goto bad;
  941                 }
  942                 vput(tdvp);
  943         } else {
  944                 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
  945                         panic("ext2_rename: EXDEV");
  946                 /*
  947                  * Short circuit rename(foo, foo).
  948                  */
  949                 if (xp->i_number == ip->i_number)
  950                         panic("ext2_rename: same file");
  951                 /*
  952                  * If the parent directory is "sticky", then the user must
  953                  * own the parent directory, or the destination of the rename,
  954                  * otherwise the destination may not be changed (except by
  955                  * root). This implements append-only directories.
  956                  */
  957                 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
  958                     tcnp->cn_cred->cr_uid != dp->i_uid &&
  959                     xp->i_uid != tcnp->cn_cred->cr_uid) {
  960                         error = EPERM;
  961                         goto bad;
  962                 }
  963                 /*
  964                  * Target must be empty if a directory and have no links
  965                  * to it. Also, ensure source and target are compatible
  966                  * (both directories, or both not directories).
  967                  */
  968                 if ((xp->i_mode & IFMT) == IFDIR) {
  969                         if (!ext2_dirempty(xp, dp->i_number, tcnp->cn_cred)) {
  970                                 error = ENOTEMPTY;
  971                                 goto bad;
  972                         }
  973                         if (!doingdirectory) {
  974                                 error = ENOTDIR;
  975                                 goto bad;
  976                         }
  977                         cache_purge(tdvp);
  978                 } else if (doingdirectory) {
  979                         error = EISDIR;
  980                         goto bad;
  981                 }
  982                 error = ext2_dirrewrite(dp, ip, tcnp);
  983                 if (error)
  984                         goto bad;
  985                 /*
  986                  * If the target directory is in the same
  987                  * directory as the source directory,
  988                  * decrement the link count on the parent
  989                  * of the target directory.
  990                  */
  991                 if (doingdirectory && !newparent) {
  992                         ext2_dec_nlink(dp);
  993                         dp->i_flag |= IN_CHANGE;
  994                 }
  995                 vput(tdvp);
  996                 /*
  997                  * Adjust the link count of the target to
  998                  * reflect the dirrewrite above.  If this is
  999                  * a directory it is empty and there are
 1000                  * no links to it, so we can squash the inode and
 1001                  * any space associated with it.  We disallowed
 1002                  * renaming over top of a directory with links to
 1003                  * it above, as the remaining link would point to
 1004                  * a directory without "." or ".." entries.
 1005                  */
 1006                 ext2_dec_nlink(xp);
 1007                 if (doingdirectory) {
 1008                         if (--xp->i_nlink != 0)
 1009                                 panic("ext2_rename: linked directory");
 1010                         error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
 1011                             tcnp->cn_cred, tcnp->cn_thread);
 1012                 }
 1013                 xp->i_flag |= IN_CHANGE;
 1014                 vput(tvp);
 1015                 xp = NULL;
 1016         }
 1017 
 1018         /*
 1019          * 3) Unlink the source.
 1020          */
 1021         fcnp->cn_flags &= ~MODMASK;
 1022         fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
 1023         VREF(fdvp);
 1024         error = relookup(fdvp, &fvp, fcnp);
 1025         if (error == 0)
 1026                 vrele(fdvp);
 1027         if (fvp != NULL) {
 1028                 xp = VTOI(fvp);
 1029                 dp = VTOI(fdvp);
 1030         } else {
 1031                 /*
 1032                  * From name has disappeared.  IN_RENAME is not sufficient
 1033                  * to protect against directory races due to timing windows,
 1034                  * so we can't panic here.
 1035                  */
 1036                 vrele(ap->a_fvp);
 1037                 return (0);
 1038         }
 1039         /*
 1040          * Ensure that the directory entry still exists and has not
 1041          * changed while the new name has been entered. If the source is
 1042          * a file then the entry may have been unlinked or renamed. In
 1043          * either case there is no further work to be done. If the source
 1044          * is a directory then it cannot have been rmdir'ed; its link
 1045          * count of three would cause a rmdir to fail with ENOTEMPTY.
 1046          * The IN_RENAME flag ensures that it cannot be moved by another
 1047          * rename.
 1048          */
 1049         if (xp != ip) {
 1050                 /*
 1051                  * From name resolves to a different inode.  IN_RENAME is
 1052                  * not sufficient protection against timing window races
 1053                  * so we can't panic here.
 1054                  */
 1055         } else {
 1056                 /*
 1057                  * If the source is a directory with a
 1058                  * new parent, the link count of the old
 1059                  * parent directory must be decremented
 1060                  * and ".." set to point to the new parent.
 1061                  */
 1062                 if (doingdirectory && newparent) {
 1063                         ext2_dec_nlink(dp);
 1064                         dp->i_flag |= IN_CHANGE;
 1065                         dirbuf = malloc(dp->i_e2fs->e2fs_bsize, M_TEMP, M_WAITOK | M_ZERO);
 1066                         if (!dirbuf) {
 1067                                 error = ENOMEM;
 1068                                 goto bad;
 1069                         }
 1070                         error = vn_rdwr(UIO_READ, fvp, (caddr_t)dirbuf,
 1071                             ip->i_e2fs->e2fs_bsize, (off_t)0,
 1072                             UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
 1073                             tcnp->cn_cred, NOCRED, NULL, NULL);
 1074                         if (error == 0) {
 1075                                 /* Like ufs little-endian: */
 1076                                 namlen = dirbuf->dotdot_type;
 1077                                 if (namlen != 2 ||
 1078                                     dirbuf->dotdot_name[0] != '.' ||
 1079                                     dirbuf->dotdot_name[1] != '.') {
 1080                                         ext2_dirbad(xp, (doff_t)12,
 1081                                             "rename: mangled dir");
 1082                                 } else {
 1083                                         dirbuf->dotdot_ino = newparent;
 1084                                         /*
 1085                                          * dirblock 0 could be htree root,
 1086                                          * try both csum update functions.
 1087                                          */
 1088                                         ext2_dirent_csum_set(ip,
 1089                                             (struct ext2fs_direct_2 *)dirbuf);
 1090                                         ext2_dx_csum_set(ip,
 1091                                             (struct ext2fs_direct_2 *)dirbuf);
 1092                                         (void)vn_rdwr(UIO_WRITE, fvp,
 1093                                             (caddr_t)dirbuf,
 1094                                             ip->i_e2fs->e2fs_bsize,
 1095                                             (off_t)0, UIO_SYSSPACE,
 1096                                             IO_NODELOCKED | IO_SYNC |
 1097                                             IO_NOMACCHECK, tcnp->cn_cred,
 1098                                             NOCRED, NULL, NULL);
 1099                                         cache_purge(fdvp);
 1100                                 }
 1101                         }
 1102                         free(dirbuf, M_TEMP);
 1103                 }
 1104                 error = ext2_dirremove(fdvp, fcnp);
 1105                 if (!error) {
 1106                         ext2_dec_nlink(xp);
 1107                         xp->i_flag |= IN_CHANGE;
 1108                 }
 1109                 xp->i_flag &= ~IN_RENAME;
 1110         }
 1111         if (dp)
 1112                 vput(fdvp);
 1113         if (xp)
 1114                 vput(fvp);
 1115         vrele(ap->a_fvp);
 1116         return (error);
 1117 
 1118 bad:
 1119         if (xp)
 1120                 vput(ITOV(xp));
 1121         vput(ITOV(dp));
 1122 out:
 1123         if (doingdirectory)
 1124                 ip->i_flag &= ~IN_RENAME;
 1125         if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
 1126                 ext2_dec_nlink(ip);
 1127                 ip->i_flag |= IN_CHANGE;
 1128                 ip->i_flag &= ~IN_RENAME;
 1129                 vput(fvp);
 1130         } else
 1131                 vrele(fvp);
 1132         return (error);
 1133 }
 1134 
 1135 #ifdef UFS_ACL
 1136 static int
 1137 ext2_do_posix1e_acl_inheritance_dir(struct vnode *dvp, struct vnode *tvp,
 1138     mode_t dmode, struct ucred *cred, struct thread *td)
 1139 {
 1140         int error;
 1141         struct inode *ip = VTOI(tvp);
 1142         struct acl *dacl, *acl;
 1143 
 1144         acl = acl_alloc(M_WAITOK);
 1145         dacl = acl_alloc(M_WAITOK);
 1146 
 1147         /*
 1148          * Retrieve default ACL from parent, if any.
 1149          */
 1150         error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
 1151         switch (error) {
 1152         case 0:
 1153                 /*
 1154                  * Retrieved a default ACL, so merge mode and ACL if
 1155                  * necessary.  If the ACL is empty, fall through to
 1156                  * the "not defined or available" case.
 1157                  */
 1158                 if (acl->acl_cnt != 0) {
 1159                         dmode = acl_posix1e_newfilemode(dmode, acl);
 1160                         ip->i_mode = dmode;
 1161                         *dacl = *acl;
 1162                         ext2_sync_acl_from_inode(ip, acl);
 1163                         break;
 1164                 }
 1165                 /* FALLTHROUGH */
 1166 
 1167         case EOPNOTSUPP:
 1168                 /*
 1169                  * Just use the mode as-is.
 1170                  */
 1171                 ip->i_mode = dmode;
 1172                 error = 0;
 1173                 goto out;
 1174 
 1175         default:
 1176                 goto out;
 1177         }
 1178 
 1179         error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
 1180         if (error == 0)
 1181                 error = VOP_SETACL(tvp, ACL_TYPE_DEFAULT, dacl, cred, td);
 1182         switch (error) {
 1183         case 0:
 1184                 break;
 1185 
 1186         case EOPNOTSUPP:
 1187                 /*
 1188                  * XXX: This should not happen, as EOPNOTSUPP above
 1189                  * was supposed to free acl.
 1190                  */
 1191 #ifdef DEBUG
 1192                 printf("ext2_mkdir: VOP_GETACL() but no VOP_SETACL()\n");
 1193 #endif  /* DEBUG */
 1194                 break;
 1195 
 1196         default:
 1197                 goto out;
 1198         }
 1199 
 1200 out:
 1201         acl_free(acl);
 1202         acl_free(dacl);
 1203 
 1204         return (error);
 1205 }
 1206 
 1207 static int
 1208 ext2_do_posix1e_acl_inheritance_file(struct vnode *dvp, struct vnode *tvp,
 1209     mode_t mode, struct ucred *cred, struct thread *td)
 1210 {
 1211         int error;
 1212         struct inode *ip = VTOI(tvp);
 1213         struct acl *acl;
 1214 
 1215         acl = acl_alloc(M_WAITOK);
 1216 
 1217         /*
 1218          * Retrieve default ACL for parent, if any.
 1219          */
 1220         error = VOP_GETACL(dvp, ACL_TYPE_DEFAULT, acl, cred, td);
 1221         switch (error) {
 1222         case 0:
 1223                 /*
 1224                  * Retrieved a default ACL, so merge mode and ACL if
 1225                  * necessary.
 1226                  */
 1227                 if (acl->acl_cnt != 0) {
 1228                         /*
 1229                          * Two possible ways for default ACL to not
 1230                          * be present.  First, the EA can be
 1231                          * undefined, or second, the default ACL can
 1232                          * be blank.  If it's blank, fall through to
 1233                          * the it's not defined case.
 1234                          */
 1235                         mode = acl_posix1e_newfilemode(mode, acl);
 1236                         ip->i_mode = mode;
 1237                         ext2_sync_acl_from_inode(ip, acl);
 1238                         break;
 1239                 }
 1240                 /* FALLTHROUGH */
 1241 
 1242         case EOPNOTSUPP:
 1243                 /*
 1244                  * Just use the mode as-is.
 1245                  */
 1246                 ip->i_mode = mode;
 1247                 error = 0;
 1248                 goto out;
 1249 
 1250         default:
 1251                 goto out;
 1252         }
 1253 
 1254         error = VOP_SETACL(tvp, ACL_TYPE_ACCESS, acl, cred, td);
 1255         switch (error) {
 1256         case 0:
 1257                 break;
 1258 
 1259         case EOPNOTSUPP:
 1260                 /*
 1261                  * XXX: This should not happen, as EOPNOTSUPP above was
 1262                  * supposed to free acl.
 1263                  */
 1264                 printf("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
 1265                     "but no VOP_SETACL()\n");
 1266                 /* panic("ufs_do_posix1e_acl_inheritance_file: VOP_GETACL() "
 1267                     "but no VOP_SETACL()"); */
 1268                 break;
 1269 
 1270         default:
 1271                 goto out;
 1272         }
 1273 
 1274 out:
 1275         acl_free(acl);
 1276 
 1277         return (error);
 1278 }
 1279 
 1280 #endif /* UFS_ACL */
 1281 
 1282 /*
 1283  * Mkdir system call
 1284  */
 1285 static int
 1286 ext2_mkdir(struct vop_mkdir_args *ap)
 1287 {
 1288         struct m_ext2fs *fs;
 1289         struct vnode *dvp = ap->a_dvp;
 1290         struct vattr *vap = ap->a_vap;
 1291         struct componentname *cnp = ap->a_cnp;
 1292         struct inode *ip, *dp;
 1293         struct vnode *tvp;
 1294         struct dirtemplate dirtemplate, *dtp;
 1295         char *buf = NULL;
 1296         int error, dmode;
 1297 
 1298 #ifdef INVARIANTS
 1299         if ((cnp->cn_flags & HASBUF) == 0)
 1300                 panic("ext2_mkdir: no name");
 1301 #endif
 1302         dp = VTOI(dvp);
 1303         if ((nlink_t)dp->i_nlink >= EXT4_LINK_MAX &&
 1304             !EXT2_HAS_RO_COMPAT_FEATURE(dp->i_e2fs, EXT2F_ROCOMPAT_DIR_NLINK)) {
 1305                 error = EMLINK;
 1306                 goto out;
 1307         }
 1308         dmode = vap->va_mode & 0777;
 1309         dmode |= IFDIR;
 1310         /*
 1311          * Must simulate part of ext2_makeinode here to acquire the inode,
 1312          * but not have it entered in the parent directory. The entry is
 1313          * made later after writing "." and ".." entries.
 1314          */
 1315         error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
 1316         if (error)
 1317                 goto out;
 1318         ip = VTOI(tvp);
 1319         fs = ip->i_e2fs;
 1320         ip->i_gid = dp->i_gid;
 1321 #ifdef SUIDDIR
 1322         {
 1323                 /*
 1324                  * if we are hacking owners here, (only do this where told to)
 1325                  * and we are not giving it TOO root, (would subvert quotas)
 1326                  * then go ahead and give it to the other user.
 1327                  * The new directory also inherits the SUID bit.
 1328                  * If user's UID and dir UID are the same,
 1329                  * 'give it away' so that the SUID is still forced on.
 1330                  */
 1331                 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
 1332                     (dp->i_mode & ISUID) && dp->i_uid) {
 1333                         dmode |= ISUID;
 1334                         ip->i_uid = dp->i_uid;
 1335                 } else {
 1336                         ip->i_uid = cnp->cn_cred->cr_uid;
 1337                 }
 1338         }
 1339 #else
 1340         ip->i_uid = cnp->cn_cred->cr_uid;
 1341 #endif
 1342         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
 1343         ip->i_mode = dmode;
 1344         tvp->v_type = VDIR;     /* Rest init'd in getnewvnode(). */
 1345         ip->i_nlink = 2;
 1346         if (cnp->cn_flags & ISWHITEOUT)
 1347                 ip->i_flags |= UF_OPAQUE;
 1348         error = ext2_update(tvp, 1);
 1349 
 1350         /*
 1351          * Bump link count in parent directory
 1352          * to reflect work done below.  Should
 1353          * be done before reference is created
 1354          * so reparation is possible if we crash.
 1355          */
 1356         ext2_inc_nlink(dp);
 1357         dp->i_flag |= IN_CHANGE;
 1358         error = ext2_update(dvp, !DOINGASYNC(dvp));
 1359         if (error)
 1360                 goto bad;
 1361 
 1362         /* Initialize directory with "." and ".." from static template. */
 1363         if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
 1364             EXT2F_INCOMPAT_FTYPE))
 1365                 dtp = &mastertemplate;
 1366         else
 1367                 dtp = &omastertemplate;
 1368         dirtemplate = *dtp;
 1369         dirtemplate.dot_ino = ip->i_number;
 1370         dirtemplate.dotdot_ino = dp->i_number;
 1371         /*
 1372          * note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE so let's
 1373          * just redefine it - for this function only
 1374          */
 1375 #undef  DIRBLKSIZ
 1376 #define DIRBLKSIZ  VTOI(dvp)->i_e2fs->e2fs_bsize
 1377         dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
 1378         buf = malloc(DIRBLKSIZ, M_TEMP, M_WAITOK | M_ZERO);
 1379         if (!buf) {
 1380                 error = ENOMEM;
 1381                 ext2_dec_nlink(dp);
 1382                 dp->i_flag |= IN_CHANGE;
 1383                 goto bad;
 1384         }
 1385         if (EXT2_HAS_RO_COMPAT_FEATURE(fs, EXT2F_ROCOMPAT_METADATA_CKSUM)) {
 1386                 dirtemplate.dotdot_reclen -= sizeof(struct ext2fs_direct_tail);
 1387                 ext2_init_dirent_tail(EXT2_DIRENT_TAIL(buf, DIRBLKSIZ));
 1388         }
 1389         memcpy(buf, &dirtemplate, sizeof(dirtemplate));
 1390         ext2_dirent_csum_set(ip, (struct ext2fs_direct_2 *)buf);
 1391         error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)buf,
 1392             DIRBLKSIZ, (off_t)0, UIO_SYSSPACE,
 1393             IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
 1394             NULL, NULL);
 1395         if (error) {
 1396                 ext2_dec_nlink(dp);
 1397                 dp->i_flag |= IN_CHANGE;
 1398                 goto bad;
 1399         }
 1400         if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
 1401                 /* XXX should grow with balloc() */
 1402                 panic("ext2_mkdir: blksize");
 1403         else {
 1404                 ip->i_size = DIRBLKSIZ;
 1405                 ip->i_flag |= IN_CHANGE;
 1406         }
 1407 
 1408 #ifdef UFS_ACL
 1409         if (dvp->v_mount->mnt_flag & MNT_ACLS) {
 1410                 error = ext2_do_posix1e_acl_inheritance_dir(dvp, tvp, dmode,
 1411                     cnp->cn_cred, cnp->cn_thread);
 1412                 if (error)
 1413                         goto bad;
 1414         }
 1415 
 1416 #endif /* UFS_ACL */
 1417 
 1418         /* Directory set up, now install its entry in the parent directory. */
 1419         error = ext2_direnter(ip, dvp, cnp);
 1420         if (error) {
 1421                 ext2_dec_nlink(dp);
 1422                 dp->i_flag |= IN_CHANGE;
 1423         }
 1424 bad:
 1425         /*
 1426          * No need to do an explicit VOP_TRUNCATE here, vrele will do this
 1427          * for us because we set the link count to 0.
 1428          */
 1429         if (error) {
 1430                 ip->i_nlink = 0;
 1431                 ip->i_flag |= IN_CHANGE;
 1432                 vput(tvp);
 1433         } else
 1434                 *ap->a_vpp = tvp;
 1435 out:
 1436         free(buf, M_TEMP);
 1437         return (error);
 1438 #undef  DIRBLKSIZ
 1439 #define DIRBLKSIZ  DEV_BSIZE
 1440 }
 1441 
 1442 /*
 1443  * Rmdir system call.
 1444  */
 1445 static int
 1446 ext2_rmdir(struct vop_rmdir_args *ap)
 1447 {
 1448         struct vnode *vp = ap->a_vp;
 1449         struct vnode *dvp = ap->a_dvp;
 1450         struct componentname *cnp = ap->a_cnp;
 1451         struct inode *ip, *dp;
 1452         int error;
 1453 
 1454         ip = VTOI(vp);
 1455         dp = VTOI(dvp);
 1456 
 1457         /*
 1458          * Verify the directory is empty (and valid).
 1459          * (Rmdir ".." won't be valid since
 1460          *  ".." will contain a reference to
 1461          *  the current directory and thus be
 1462          *  non-empty.)
 1463          */
 1464         if (!ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
 1465                 error = ENOTEMPTY;
 1466                 goto out;
 1467         }
 1468         if ((dp->i_flags & APPEND)
 1469             || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
 1470                 error = EPERM;
 1471                 goto out;
 1472         }
 1473         /*
 1474          * Delete reference to directory before purging
 1475          * inode.  If we crash in between, the directory
 1476          * will be reattached to lost+found,
 1477          */
 1478         error = ext2_dirremove(dvp, cnp);
 1479         if (error)
 1480                 goto out;
 1481         ext2_dec_nlink(dp);
 1482         dp->i_flag |= IN_CHANGE;
 1483         cache_purge(dvp);
 1484         VOP_UNLOCK(dvp, 0);
 1485         /*
 1486          * Truncate inode.  The only stuff left
 1487          * in the directory is "." and "..".
 1488          */
 1489         ip->i_nlink = 0;
 1490         error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
 1491             cnp->cn_thread);
 1492         cache_purge(ITOV(ip));
 1493         if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
 1494                 VOP_UNLOCK(vp, 0);
 1495                 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
 1496                 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 1497         }
 1498 out:
 1499         return (error);
 1500 }
 1501 
 1502 /*
 1503  * symlink -- make a symbolic link
 1504  */
 1505 static int
 1506 ext2_symlink(struct vop_symlink_args *ap)
 1507 {
 1508         struct vnode *vp, **vpp = ap->a_vpp;
 1509         struct inode *ip;
 1510         int len, error;
 1511 
 1512         error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
 1513             vpp, ap->a_cnp);
 1514         if (error)
 1515                 return (error);
 1516         vp = *vpp;
 1517         len = strlen(ap->a_target);
 1518         if (len < vp->v_mount->mnt_maxsymlinklen) {
 1519                 ip = VTOI(vp);
 1520                 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
 1521                 ip->i_size = len;
 1522                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
 1523         } else
 1524                 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
 1525                     UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
 1526                     ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
 1527         if (error)
 1528                 vput(vp);
 1529         return (error);
 1530 }
 1531 
 1532 /*
 1533  * Return target name of a symbolic link
 1534  */
 1535 static int
 1536 ext2_readlink(struct vop_readlink_args *ap)
 1537 {
 1538         struct vnode *vp = ap->a_vp;
 1539         struct inode *ip = VTOI(vp);
 1540         int isize;
 1541 
 1542         isize = ip->i_size;
 1543         if (isize < vp->v_mount->mnt_maxsymlinklen) {
 1544                 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
 1545                 return (0);
 1546         }
 1547         return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
 1548 }
 1549 
 1550 /*
 1551  * Calculate the logical to physical mapping if not done already,
 1552  * then call the device strategy routine.
 1553  *
 1554  * In order to be able to swap to a file, the ext2_bmaparray() operation may not
 1555  * deadlock on memory.  See ext2_bmap() for details.
 1556  */
 1557 static int
 1558 ext2_strategy(struct vop_strategy_args *ap)
 1559 {
 1560         struct buf *bp = ap->a_bp;
 1561         struct vnode *vp = ap->a_vp;
 1562         struct bufobj *bo;
 1563         daddr_t blkno;
 1564         int error;
 1565 
 1566         if (vp->v_type == VBLK || vp->v_type == VCHR)
 1567                 panic("ext2_strategy: spec");
 1568         if (bp->b_blkno == bp->b_lblkno) {
 1569 
 1570                 if (VTOI(ap->a_vp)->i_flag & IN_E4EXTENTS)
 1571                         error = ext4_bmapext(vp, bp->b_lblkno, &blkno, NULL, NULL);
 1572                 else
 1573                         error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
 1574 
 1575                 bp->b_blkno = blkno;
 1576                 if (error) {
 1577                         bp->b_error = error;
 1578                         bp->b_ioflags |= BIO_ERROR;
 1579                         bufdone(bp);
 1580                         return (0);
 1581                 }
 1582                 if ((long)bp->b_blkno == -1)
 1583                         vfs_bio_clrbuf(bp);
 1584         }
 1585         if ((long)bp->b_blkno == -1) {
 1586                 bufdone(bp);
 1587                 return (0);
 1588         }
 1589         bp->b_iooffset = dbtob(bp->b_blkno);
 1590         bo = VFSTOEXT2(vp->v_mount)->um_bo;
 1591         BO_STRATEGY(bo, bp);
 1592         return (0);
 1593 }
 1594 
 1595 /*
 1596  * Print out the contents of an inode.
 1597  */
 1598 static int
 1599 ext2_print(struct vop_print_args *ap)
 1600 {
 1601         struct vnode *vp = ap->a_vp;
 1602         struct inode *ip = VTOI(vp);
 1603 
 1604         vn_printf(ip->i_devvp, "\tino %ju", (uintmax_t)ip->i_number);
 1605         if (vp->v_type == VFIFO)
 1606                 fifo_printinfo(vp);
 1607         printf("\n");
 1608         return (0);
 1609 }
 1610 
 1611 /*
 1612  * Close wrapper for fifos.
 1613  *
 1614  * Update the times on the inode then do device close.
 1615  */
 1616 static int
 1617 ext2fifo_close(struct vop_close_args *ap)
 1618 {
 1619         struct vnode *vp = ap->a_vp;
 1620 
 1621         VI_LOCK(vp);
 1622         if (vp->v_usecount > 1)
 1623                 ext2_itimes_locked(vp);
 1624         VI_UNLOCK(vp);
 1625         return (fifo_specops.vop_close(ap));
 1626 }
 1627 
 1628 /*
 1629  * Kqfilter wrapper for fifos.
 1630  *
 1631  * Fall through to ext2 kqfilter routines if needed
 1632  */
 1633 static int
 1634 ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
 1635 {
 1636         int error;
 1637 
 1638         error = fifo_specops.vop_kqfilter(ap);
 1639         if (error)
 1640                 error = vfs_kqfilter(ap);
 1641         return (error);
 1642 }
 1643 
 1644 /*
 1645  * Return POSIX pathconf information applicable to ext2 filesystems.
 1646  */
 1647 static int
 1648 ext2_pathconf(struct vop_pathconf_args *ap)
 1649 {
 1650         int error = 0;
 1651 
 1652         switch (ap->a_name) {
 1653         case _PC_LINK_MAX:
 1654                 if (EXT2_HAS_RO_COMPAT_FEATURE(VTOI(ap->a_vp)->i_e2fs,
 1655                     EXT2F_ROCOMPAT_DIR_NLINK))
 1656                         *ap->a_retval = INT_MAX;
 1657                 else
 1658                         *ap->a_retval = EXT4_LINK_MAX;
 1659                 break;
 1660         case _PC_NAME_MAX:
 1661                 *ap->a_retval = NAME_MAX;
 1662                 break;
 1663         case _PC_PIPE_BUF:
 1664                 if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO)
 1665                         *ap->a_retval = PIPE_BUF;
 1666                 else
 1667                         error = EINVAL;
 1668                 break;
 1669         case _PC_CHOWN_RESTRICTED:
 1670                 *ap->a_retval = 1;
 1671                 break;
 1672         case _PC_NO_TRUNC:
 1673                 *ap->a_retval = 1;
 1674                 break;
 1675 
 1676 #ifdef UFS_ACL
 1677         case _PC_ACL_EXTENDED:
 1678                 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
 1679                         *ap->a_retval = 1;
 1680                 else
 1681                         *ap->a_retval = 0;
 1682                 break;
 1683         case _PC_ACL_PATH_MAX:
 1684                 if (ap->a_vp->v_mount->mnt_flag & MNT_ACLS)
 1685                         *ap->a_retval = ACL_MAX_ENTRIES;
 1686                 else
 1687                         *ap->a_retval = 3;
 1688                 break;
 1689 #endif /* UFS_ACL */
 1690 
 1691         case _PC_MIN_HOLE_SIZE:
 1692                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 1693                 break;
 1694         case _PC_PRIO_IO:
 1695                 *ap->a_retval = 0;
 1696                 break;
 1697         case _PC_SYNC_IO:
 1698                 *ap->a_retval = 0;
 1699                 break;
 1700         case _PC_ALLOC_SIZE_MIN:
 1701                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
 1702                 break;
 1703         case _PC_FILESIZEBITS:
 1704                 *ap->a_retval = 64;
 1705                 break;
 1706         case _PC_REC_INCR_XFER_SIZE:
 1707                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 1708                 break;
 1709         case _PC_REC_MAX_XFER_SIZE:
 1710                 *ap->a_retval = -1;     /* means ``unlimited'' */
 1711                 break;
 1712         case _PC_REC_MIN_XFER_SIZE:
 1713                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 1714                 break;
 1715         case _PC_REC_XFER_ALIGN:
 1716                 *ap->a_retval = PAGE_SIZE;
 1717                 break;
 1718         case _PC_SYMLINK_MAX:
 1719                 *ap->a_retval = MAXPATHLEN;
 1720                 break;
 1721 
 1722         default:
 1723                 error = vop_stdpathconf(ap);
 1724                 break;
 1725         }
 1726         return (error);
 1727 }
 1728 
 1729 /*
 1730  * Vnode operation to remove a named attribute.
 1731  */
 1732 static int
 1733 ext2_deleteextattr(struct vop_deleteextattr_args *ap)
 1734 {
 1735         struct inode *ip;
 1736         struct m_ext2fs *fs;
 1737         int error;
 1738 
 1739         ip = VTOI(ap->a_vp);
 1740         fs = ip->i_e2fs;
 1741 
 1742         if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
 1743                 return (EOPNOTSUPP);
 1744 
 1745         if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
 1746                 return (EOPNOTSUPP);
 1747 
 1748         error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
 1749             ap->a_cred, ap->a_td, VWRITE);
 1750         if (error)
 1751                 return (error);
 1752 
 1753         error = ENOATTR;
 1754 
 1755         if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
 1756                 error = ext2_extattr_inode_delete(ip, ap->a_attrnamespace, ap->a_name);
 1757                 if (error != ENOATTR)
 1758                         return (error);
 1759         }
 1760 
 1761         if (ip->i_facl)
 1762                 error = ext2_extattr_block_delete(ip, ap->a_attrnamespace, ap->a_name);
 1763 
 1764         return (error);
 1765 }
 1766 
 1767 /*
 1768  * Vnode operation to retrieve a named extended attribute.
 1769  */
 1770 static int
 1771 ext2_getextattr(struct vop_getextattr_args *ap)
 1772 {
 1773         struct inode *ip;
 1774         struct m_ext2fs *fs;
 1775         int error;
 1776 
 1777         ip = VTOI(ap->a_vp);
 1778         fs = ip->i_e2fs;
 1779 
 1780         if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
 1781                 return (EOPNOTSUPP);
 1782 
 1783         if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
 1784                 return (EOPNOTSUPP);
 1785 
 1786         error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
 1787             ap->a_cred, ap->a_td, VREAD);
 1788         if (error)
 1789                 return (error);
 1790 
 1791         if (ap->a_size != NULL)
 1792                 *ap->a_size = 0;
 1793 
 1794         error = ENOATTR;
 1795 
 1796         if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
 1797                 error = ext2_extattr_inode_get(ip, ap->a_attrnamespace,
 1798                     ap->a_name, ap->a_uio, ap->a_size);
 1799                 if (error != ENOATTR)
 1800                         return (error);
 1801         }
 1802 
 1803         if (ip->i_facl)
 1804                 error = ext2_extattr_block_get(ip, ap->a_attrnamespace,
 1805                     ap->a_name, ap->a_uio, ap->a_size);
 1806 
 1807         return (error);
 1808 }
 1809 
 1810 /*
 1811  * Vnode operation to retrieve extended attributes on a vnode.
 1812  */
 1813 static int
 1814 ext2_listextattr(struct vop_listextattr_args *ap)
 1815 {
 1816         struct inode *ip;
 1817         struct m_ext2fs *fs;
 1818         int error;
 1819 
 1820         ip = VTOI(ap->a_vp);
 1821         fs = ip->i_e2fs;
 1822 
 1823         if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
 1824                 return (EOPNOTSUPP);
 1825 
 1826         if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
 1827                 return (EOPNOTSUPP);
 1828 
 1829         error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
 1830             ap->a_cred, ap->a_td, VREAD);
 1831         if (error)
 1832                 return (error);
 1833 
 1834         if (ap->a_size != NULL)
 1835                 *ap->a_size = 0;
 1836 
 1837         if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
 1838                 error = ext2_extattr_inode_list(ip, ap->a_attrnamespace,
 1839                     ap->a_uio, ap->a_size);
 1840                 if (error)
 1841                         return (error);
 1842         }
 1843 
 1844         if (ip->i_facl)
 1845                 error = ext2_extattr_block_list(ip, ap->a_attrnamespace,
 1846                     ap->a_uio, ap->a_size);
 1847 
 1848         return (error);
 1849 }
 1850 
 1851 /*
 1852  * Vnode operation to set a named attribute.
 1853  */
 1854 static int
 1855 ext2_setextattr(struct vop_setextattr_args *ap)
 1856 {
 1857         struct inode *ip;
 1858         struct m_ext2fs *fs;
 1859         int error;
 1860 
 1861         ip = VTOI(ap->a_vp);
 1862         fs = ip->i_e2fs;
 1863 
 1864         if (!EXT2_HAS_COMPAT_FEATURE(ip->i_e2fs, EXT2F_COMPAT_EXT_ATTR))
 1865                 return (EOPNOTSUPP);
 1866 
 1867         if (ap->a_vp->v_type == VCHR || ap->a_vp->v_type == VBLK)
 1868                 return (EOPNOTSUPP);
 1869 
 1870         error = extattr_check_cred(ap->a_vp, ap->a_attrnamespace,
 1871             ap->a_cred, ap->a_td, VWRITE);
 1872         if (error)
 1873                 return (error);
 1874 
 1875         error = ext2_extattr_valid_attrname(ap->a_attrnamespace, ap->a_name);
 1876         if (error)
 1877                 return (error);
 1878 
 1879         if (EXT2_INODE_SIZE(fs) != E2FS_REV0_INODE_SIZE) {
 1880                 error = ext2_extattr_inode_set(ip, ap->a_attrnamespace,
 1881                     ap->a_name, ap->a_uio);
 1882                 if (error != ENOSPC)
 1883                         return (error);
 1884         }
 1885 
 1886         error = ext2_extattr_block_set(ip, ap->a_attrnamespace,
 1887             ap->a_name, ap->a_uio);
 1888 
 1889         return (error);
 1890 }
 1891 
 1892 /*
 1893  * Vnode pointer to File handle
 1894  */
 1895 /* ARGSUSED */
 1896 static int
 1897 ext2_vptofh(struct vop_vptofh_args *ap)
 1898 {
 1899         struct inode *ip;
 1900         struct ufid *ufhp;
 1901 
 1902         ip = VTOI(ap->a_vp);
 1903         ufhp = (struct ufid *)ap->a_fhp;
 1904         ufhp->ufid_len = sizeof(struct ufid);
 1905         ufhp->ufid_ino = ip->i_number;
 1906         ufhp->ufid_gen = ip->i_gen;
 1907         return (0);
 1908 }
 1909 
 1910 /*
 1911  * Initialize the vnode associated with a new inode, handle aliased
 1912  * vnodes.
 1913  */
 1914 int
 1915 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
 1916 {
 1917         struct inode *ip;
 1918         struct vnode *vp;
 1919 
 1920         vp = *vpp;
 1921         ip = VTOI(vp);
 1922         vp->v_type = IFTOVT(ip->i_mode);
 1923         if (vp->v_type == VFIFO)
 1924                 vp->v_op = fifoops;
 1925 
 1926         if (ip->i_number == EXT2_ROOTINO)
 1927                 vp->v_vflag |= VV_ROOT;
 1928         ip->i_modrev = init_va_filerev();
 1929         *vpp = vp;
 1930         return (0);
 1931 }
 1932 
 1933 /*
 1934  * Allocate a new inode.
 1935  */
 1936 static int
 1937 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
 1938     struct componentname *cnp)
 1939 {
 1940         struct inode *ip, *pdir;
 1941         struct vnode *tvp;
 1942         int error;
 1943 
 1944         pdir = VTOI(dvp);
 1945 #ifdef INVARIANTS
 1946         if ((cnp->cn_flags & HASBUF) == 0)
 1947                 panic("ext2_makeinode: no name");
 1948 #endif
 1949         *vpp = NULL;
 1950         if ((mode & IFMT) == 0)
 1951                 mode |= IFREG;
 1952 
 1953         error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
 1954         if (error) {
 1955                 return (error);
 1956         }
 1957         ip = VTOI(tvp);
 1958         ip->i_gid = pdir->i_gid;
 1959 #ifdef SUIDDIR
 1960         {
 1961                 /*
 1962                  * if we are
 1963                  * not the owner of the directory,
 1964                  * and we are hacking owners here, (only do this where told to)
 1965                  * and we are not giving it TOO root, (would subvert quotas)
 1966                  * then go ahead and give it to the other user.
 1967                  * Note that this drops off the execute bits for security.
 1968                  */
 1969                 if ((dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
 1970                     (pdir->i_mode & ISUID) &&
 1971                     (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
 1972                         ip->i_uid = pdir->i_uid;
 1973                         mode &= ~07111;
 1974                 } else {
 1975                         ip->i_uid = cnp->cn_cred->cr_uid;
 1976                 }
 1977         }
 1978 #else
 1979         ip->i_uid = cnp->cn_cred->cr_uid;
 1980 #endif
 1981         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
 1982         ip->i_mode = mode;
 1983         tvp->v_type = IFTOVT(mode);     /* Rest init'd in getnewvnode(). */
 1984         ip->i_nlink = 1;
 1985         if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
 1986                 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
 1987                         ip->i_mode &= ~ISGID;
 1988         }
 1989 
 1990         if (cnp->cn_flags & ISWHITEOUT)
 1991                 ip->i_flags |= UF_OPAQUE;
 1992 
 1993         /*
 1994          * Make sure inode goes to disk before directory entry.
 1995          */
 1996         error = ext2_update(tvp, !DOINGASYNC(tvp));
 1997         if (error)
 1998                 goto bad;
 1999 
 2000 #ifdef UFS_ACL
 2001         if (dvp->v_mount->mnt_flag & MNT_ACLS) {
 2002                 error = ext2_do_posix1e_acl_inheritance_file(dvp, tvp, mode,
 2003                     cnp->cn_cred, cnp->cn_thread);
 2004                 if (error)
 2005                         goto bad;
 2006         }
 2007 #endif /* UFS_ACL */
 2008 
 2009         error = ext2_direnter(ip, dvp, cnp);
 2010         if (error)
 2011                 goto bad;
 2012 
 2013         *vpp = tvp;
 2014         return (0);
 2015 
 2016 bad:
 2017         /*
 2018          * Write error occurred trying to update the inode
 2019          * or the directory so must deallocate the inode.
 2020          */
 2021         ip->i_nlink = 0;
 2022         ip->i_flag |= IN_CHANGE;
 2023         vput(tvp);
 2024         return (error);
 2025 }
 2026 
 2027 /*
 2028  * Vnode op for reading.
 2029  */
 2030 static int
 2031 ext2_read(struct vop_read_args *ap)
 2032 {
 2033         struct vnode *vp;
 2034         struct inode *ip;
 2035         struct uio *uio;
 2036         struct m_ext2fs *fs;
 2037         struct buf *bp;
 2038         daddr_t lbn, nextlbn;
 2039         off_t bytesinfile;
 2040         long size, xfersize, blkoffset;
 2041         int error, orig_resid, seqcount;
 2042         int ioflag;
 2043 
 2044         vp = ap->a_vp;
 2045         uio = ap->a_uio;
 2046         ioflag = ap->a_ioflag;
 2047 
 2048         seqcount = ap->a_ioflag >> IO_SEQSHIFT;
 2049         ip = VTOI(vp);
 2050 
 2051 #ifdef INVARIANTS
 2052         if (uio->uio_rw != UIO_READ)
 2053                 panic("%s: mode", "ext2_read");
 2054 
 2055         if (vp->v_type == VLNK) {
 2056                 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
 2057                         panic("%s: short symlink", "ext2_read");
 2058         } else if (vp->v_type != VREG && vp->v_type != VDIR)
 2059                 panic("%s: type %d", "ext2_read", vp->v_type);
 2060 #endif
 2061         orig_resid = uio->uio_resid;
 2062         KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
 2063         if (orig_resid == 0)
 2064                 return (0);
 2065         KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
 2066         fs = ip->i_e2fs;
 2067         if (uio->uio_offset < ip->i_size &&
 2068             uio->uio_offset >= fs->e2fs_maxfilesize)
 2069                 return (EOVERFLOW);
 2070 
 2071         for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
 2072                 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
 2073                         break;
 2074                 lbn = lblkno(fs, uio->uio_offset);
 2075                 nextlbn = lbn + 1;
 2076                 size = blksize(fs, ip, lbn);
 2077                 blkoffset = blkoff(fs, uio->uio_offset);
 2078 
 2079                 xfersize = fs->e2fs_fsize - blkoffset;
 2080                 if (uio->uio_resid < xfersize)
 2081                         xfersize = uio->uio_resid;
 2082                 if (bytesinfile < xfersize)
 2083                         xfersize = bytesinfile;
 2084 
 2085                 if (lblktosize(fs, nextlbn) >= ip->i_size)
 2086                         error = bread(vp, lbn, size, NOCRED, &bp);
 2087                 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
 2088                         error = cluster_read(vp, ip->i_size, lbn, size,
 2089                             NOCRED, blkoffset + uio->uio_resid, seqcount,
 2090                             0, &bp);
 2091                 } else if (seqcount > 1) {
 2092                         u_int nextsize = blksize(fs, ip, nextlbn);
 2093 
 2094                         error = breadn(vp, lbn,
 2095                             size, &nextlbn, &nextsize, 1, NOCRED, &bp);
 2096                 } else
 2097                         error = bread(vp, lbn, size, NOCRED, &bp);
 2098                 if (error) {
 2099                         brelse(bp);
 2100                         bp = NULL;
 2101                         break;
 2102                 }
 2103 
 2104                 /*
 2105                  * We should only get non-zero b_resid when an I/O error
 2106                  * has occurred, which should cause us to break above.
 2107                  * However, if the short read did not cause an error,
 2108                  * then we want to ensure that we do not uiomove bad
 2109                  * or uninitialized data.
 2110                  */
 2111                 size -= bp->b_resid;
 2112                 if (size < xfersize) {
 2113                         if (size == 0)
 2114                                 break;
 2115                         xfersize = size;
 2116                 }
 2117                 error = uiomove((char *)bp->b_data + blkoffset,
 2118                     (int)xfersize, uio);
 2119                 if (error)
 2120                         break;
 2121                 vfs_bio_brelse(bp, ioflag);
 2122         }
 2123 
 2124         /*
 2125          * This can only happen in the case of an error because the loop
 2126          * above resets bp to NULL on each iteration and on normal
 2127          * completion has not set a new value into it. so it must have come
 2128          * from a 'break' statement
 2129          */
 2130         if (bp != NULL)
 2131                 vfs_bio_brelse(bp, ioflag);
 2132 
 2133         if ((error == 0 || uio->uio_resid != orig_resid) &&
 2134             (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
 2135                 ip->i_flag |= IN_ACCESS;
 2136         return (error);
 2137 }
 2138 
 2139 static int
 2140 ext2_ioctl(struct vop_ioctl_args *ap)
 2141 {
 2142 
 2143         switch (ap->a_command) {
 2144         case FIOSEEKDATA:
 2145         case FIOSEEKHOLE:
 2146                 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
 2147                     (off_t *)ap->a_data, ap->a_cred));
 2148         default:
 2149                 return (ENOTTY);
 2150         }
 2151 }
 2152 
 2153 /*
 2154  * Vnode op for writing.
 2155  */
 2156 static int
 2157 ext2_write(struct vop_write_args *ap)
 2158 {
 2159         struct vnode *vp;
 2160         struct uio *uio;
 2161         struct inode *ip;
 2162         struct m_ext2fs *fs;
 2163         struct buf *bp;
 2164         daddr_t lbn;
 2165         off_t osize;
 2166         int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
 2167 
 2168         ioflag = ap->a_ioflag;
 2169         uio = ap->a_uio;
 2170         vp = ap->a_vp;
 2171 
 2172         seqcount = ioflag >> IO_SEQSHIFT;
 2173         ip = VTOI(vp);
 2174 
 2175 #ifdef INVARIANTS
 2176         if (uio->uio_rw != UIO_WRITE)
 2177                 panic("%s: mode", "ext2_write");
 2178 #endif
 2179 
 2180         switch (vp->v_type) {
 2181         case VREG:
 2182                 if (ioflag & IO_APPEND)
 2183                         uio->uio_offset = ip->i_size;
 2184                 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
 2185                         return (EPERM);
 2186                 /* FALLTHROUGH */
 2187         case VLNK:
 2188                 break;
 2189         case VDIR:
 2190                 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
 2191                 if ((ioflag & IO_SYNC) == 0)
 2192                         panic("ext2_write: nonsync dir write");
 2193                 break;
 2194         default:
 2195                 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
 2196                     vp->v_type, (intmax_t)uio->uio_offset,
 2197                     (intmax_t)uio->uio_resid);
 2198         }
 2199 
 2200         KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
 2201         KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
 2202         fs = ip->i_e2fs;
 2203         if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
 2204                 return (EFBIG);
 2205         /*
 2206          * Maybe this should be above the vnode op call, but so long as
 2207          * file servers have no limits, I don't think it matters.
 2208          */
 2209         if (vn_rlimit_fsize(vp, uio, uio->uio_td))
 2210                 return (EFBIG);
 2211 
 2212         resid = uio->uio_resid;
 2213         osize = ip->i_size;
 2214         if (seqcount > BA_SEQMAX)
 2215                 flags = BA_SEQMAX << BA_SEQSHIFT;
 2216         else
 2217                 flags = seqcount << BA_SEQSHIFT;
 2218         if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
 2219                 flags |= IO_SYNC;
 2220 
 2221         for (error = 0; uio->uio_resid > 0;) {
 2222                 lbn = lblkno(fs, uio->uio_offset);
 2223                 blkoffset = blkoff(fs, uio->uio_offset);
 2224                 xfersize = fs->e2fs_fsize - blkoffset;
 2225                 if (uio->uio_resid < xfersize)
 2226                         xfersize = uio->uio_resid;
 2227                 if (uio->uio_offset + xfersize > ip->i_size)
 2228                         vnode_pager_setsize(vp, uio->uio_offset + xfersize);
 2229 
 2230                 /*
 2231                  * We must perform a read-before-write if the transfer size
 2232                  * does not cover the entire buffer.
 2233                  */
 2234                 if (fs->e2fs_bsize > xfersize)
 2235                         flags |= BA_CLRBUF;
 2236                 else
 2237                         flags &= ~BA_CLRBUF;
 2238                 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
 2239                     ap->a_cred, &bp, flags);
 2240                 if (error != 0)
 2241                         break;
 2242 
 2243                 if ((ioflag & (IO_SYNC | IO_INVAL)) == (IO_SYNC | IO_INVAL))
 2244                         bp->b_flags |= B_NOCACHE;
 2245                 if (uio->uio_offset + xfersize > ip->i_size)
 2246                         ip->i_size = uio->uio_offset + xfersize;
 2247                 size = blksize(fs, ip, lbn) - bp->b_resid;
 2248                 if (size < xfersize)
 2249                         xfersize = size;
 2250 
 2251                 error =
 2252                     uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
 2253                 /*
 2254                  * If the buffer is not already filled and we encounter an
 2255                  * error while trying to fill it, we have to clear out any
 2256                  * garbage data from the pages instantiated for the buffer.
 2257                  * If we do not, a failed uiomove() during a write can leave
 2258                  * the prior contents of the pages exposed to a userland mmap.
 2259                  *
 2260                  * Note that we need only clear buffers with a transfer size
 2261                  * equal to the block size because buffers with a shorter
 2262                  * transfer size were cleared above by the call to ext2_balloc()
 2263                  * with the BA_CLRBUF flag set.
 2264                  *
 2265                  * If the source region for uiomove identically mmaps the
 2266                  * buffer, uiomove() performed the NOP copy, and the buffer
 2267                  * content remains valid because the page fault handler
 2268                  * validated the pages.
 2269                  */
 2270                 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
 2271                     fs->e2fs_bsize == xfersize)
 2272                         vfs_bio_clrbuf(bp);
 2273 
 2274                 vfs_bio_set_flags(bp, ioflag);
 2275 
 2276                 /*
 2277                  * If IO_SYNC each buffer is written synchronously.  Otherwise
 2278                  * if we have a severe page deficiency write the buffer
 2279                  * asynchronously.  Otherwise try to cluster, and if that
 2280                  * doesn't do it then either do an async write (if O_DIRECT),
 2281                  * or a delayed write (if not).
 2282                  */
 2283                 if (ioflag & IO_SYNC) {
 2284                         (void)bwrite(bp);
 2285                 } else if (vm_page_count_severe() ||
 2286                             buf_dirty_count_severe() ||
 2287                     (ioflag & IO_ASYNC)) {
 2288                         bp->b_flags |= B_CLUSTEROK;
 2289                         bawrite(bp);
 2290                 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
 2291                         if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
 2292                                 bp->b_flags |= B_CLUSTEROK;
 2293                                 cluster_write(vp, bp, ip->i_size, seqcount, 0);
 2294                         } else {
 2295                                 bawrite(bp);
 2296                         }
 2297                 } else if (ioflag & IO_DIRECT) {
 2298                         bp->b_flags |= B_CLUSTEROK;
 2299                         bawrite(bp);
 2300                 } else {
 2301                         bp->b_flags |= B_CLUSTEROK;
 2302                         bdwrite(bp);
 2303                 }
 2304                 if (error || xfersize == 0)
 2305                         break;
 2306         }
 2307         /*
 2308          * If we successfully wrote any data, and we are not the superuser
 2309          * we clear the setuid and setgid bits as a precaution against
 2310          * tampering.
 2311          */
 2312         if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
 2313             ap->a_cred) {
 2314                 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
 2315                         ip->i_mode &= ~(ISUID | ISGID);
 2316         }
 2317         if (error) {
 2318                 if (ioflag & IO_UNIT) {
 2319                         (void)ext2_truncate(vp, osize,
 2320                             ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
 2321                         uio->uio_offset -= resid - uio->uio_resid;
 2322                         uio->uio_resid = resid;
 2323                 }
 2324         }
 2325         if (uio->uio_resid != resid) {
 2326                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
 2327                 if (ioflag & IO_SYNC)
 2328                         error = ext2_update(vp, 1);
 2329         }
 2330         return (error);
 2331 }

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