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  * Copyright (c) 1982, 1986, 1989, 1993
    9  *      The Regents of the University of California.  All rights reserved.
   10  * (c) UNIX System Laboratories, Inc.
   11  * All or some portions of this file are derived from material licensed
   12  * to the University of California by American Telephone and Telegraph
   13  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
   14  * the permission of UNIX System Laboratories, Inc.
   15  *
   16  * Redistribution and use in source and binary forms, with or without
   17  * modification, are permitted provided that the following conditions
   18  * are met:
   19  * 1. Redistributions of source code must retain the above copyright
   20  *    notice, this list of conditions and the following disclaimer.
   21  * 2. Redistributions in binary form must reproduce the above copyright
   22  *    notice, this list of conditions and the following disclaimer in the
   23  *    documentation and/or other materials provided with the distribution.
   24  * 4. Neither the name of the University nor the names of its contributors
   25  *    may be used to endorse or promote products derived from this software
   26  *    without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   38  * SUCH DAMAGE.
   39  *
   40  *      @(#)ufs_vnops.c 8.7 (Berkeley) 2/3/94
   41  *      @(#)ufs_vnops.c 8.27 (Berkeley) 5/27/95
   42  * $FreeBSD: releng/10.2/sys/fs/ext2fs/ext2_vnops.c 278096 2015-02-02 15:52:11Z pfg $
   43  */
   44 
   45 #include "opt_suiddir.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/kernel.h>
   50 #include <sys/fcntl.h>
   51 #include <sys/filio.h>
   52 #include <sys/stat.h>
   53 #include <sys/bio.h>
   54 #include <sys/buf.h>
   55 #include <sys/endian.h>
   56 #include <sys/priv.h>
   57 #include <sys/rwlock.h>
   58 #include <sys/mount.h>
   59 #include <sys/unistd.h>
   60 #include <sys/time.h>
   61 #include <sys/vnode.h>
   62 #include <sys/namei.h>
   63 #include <sys/lockf.h>
   64 #include <sys/event.h>
   65 #include <sys/conf.h>
   66 #include <sys/file.h>
   67 
   68 #include <vm/vm.h>
   69 #include <vm/vm_param.h>
   70 #include <vm/vm_extern.h>
   71 #include <vm/vm_object.h>
   72 #include <vm/vm_page.h>
   73 #include <vm/vm_pager.h>
   74 #include <vm/vnode_pager.h>
   75 
   76 #include "opt_directio.h"
   77 
   78 #include <ufs/ufs/dir.h>
   79 
   80 #include <fs/ext2fs/fs.h>
   81 #include <fs/ext2fs/inode.h>
   82 #include <fs/ext2fs/ext2_extern.h>
   83 #include <fs/ext2fs/ext2fs.h>
   84 #include <fs/ext2fs/ext2_dinode.h>
   85 #include <fs/ext2fs/ext2_dir.h>
   86 #include <fs/ext2fs/ext2_mount.h>
   87 
   88 static int ext2_makeinode(int mode, struct vnode *, struct vnode **, struct componentname *);
   89 static void ext2_itimes_locked(struct vnode *);
   90 static int ext4_ext_read(struct vop_read_args *);
   91 static int ext2_ind_read(struct vop_read_args *);
   92 
   93 static vop_access_t     ext2_access;
   94 static int ext2_chmod(struct vnode *, int, struct ucred *, struct thread *);
   95 static int ext2_chown(struct vnode *, uid_t, gid_t, struct ucred *,
   96     struct thread *);
   97 static vop_close_t      ext2_close;
   98 static vop_create_t     ext2_create;
   99 static vop_fsync_t      ext2_fsync;
  100 static vop_getpages_t   ext2_getpages;
  101 static vop_getattr_t    ext2_getattr;
  102 static vop_ioctl_t      ext2_ioctl;
  103 static vop_link_t       ext2_link;
  104 static vop_mkdir_t      ext2_mkdir;
  105 static vop_mknod_t      ext2_mknod;
  106 static vop_open_t       ext2_open;
  107 static vop_pathconf_t   ext2_pathconf;
  108 static vop_print_t      ext2_print;
  109 static vop_read_t       ext2_read;
  110 static vop_readlink_t   ext2_readlink;
  111 static vop_remove_t     ext2_remove;
  112 static vop_rename_t     ext2_rename;
  113 static vop_rmdir_t      ext2_rmdir;
  114 static vop_setattr_t    ext2_setattr;
  115 static vop_strategy_t   ext2_strategy;
  116 static vop_symlink_t    ext2_symlink;
  117 static vop_write_t      ext2_write;
  118 static vop_vptofh_t     ext2_vptofh;
  119 static vop_close_t      ext2fifo_close;
  120 static vop_kqfilter_t   ext2fifo_kqfilter;
  121 
  122 /* Global vfs data structures for ext2. */
  123 struct vop_vector ext2_vnodeops = {
  124         .vop_default =          &default_vnodeops,
  125         .vop_access =           ext2_access,
  126         .vop_bmap =             ext2_bmap,
  127         .vop_cachedlookup =     ext2_lookup,
  128         .vop_close =            ext2_close,
  129         .vop_create =           ext2_create,
  130         .vop_fsync =            ext2_fsync,
  131         .vop_getpages =         ext2_getpages,
  132         .vop_getattr =          ext2_getattr,
  133         .vop_inactive =         ext2_inactive,
  134         .vop_ioctl =            ext2_ioctl,
  135         .vop_link =             ext2_link,
  136         .vop_lookup =           vfs_cache_lookup,
  137         .vop_mkdir =            ext2_mkdir,
  138         .vop_mknod =            ext2_mknod,
  139         .vop_open =             ext2_open,
  140         .vop_pathconf =         ext2_pathconf,
  141         .vop_poll =             vop_stdpoll,
  142         .vop_print =            ext2_print,
  143         .vop_read =             ext2_read,
  144         .vop_readdir =          ext2_readdir,
  145         .vop_readlink =         ext2_readlink,
  146         .vop_reallocblks =      ext2_reallocblks,
  147         .vop_reclaim =          ext2_reclaim,
  148         .vop_remove =           ext2_remove,
  149         .vop_rename =           ext2_rename,
  150         .vop_rmdir =            ext2_rmdir,
  151         .vop_setattr =          ext2_setattr,
  152         .vop_strategy =         ext2_strategy,
  153         .vop_symlink =          ext2_symlink,
  154         .vop_write =            ext2_write,
  155         .vop_vptofh =           ext2_vptofh,
  156 };
  157 
  158 struct vop_vector ext2_fifoops = {
  159         .vop_default =          &fifo_specops,
  160         .vop_access =           ext2_access,
  161         .vop_close =            ext2fifo_close,
  162         .vop_fsync =            ext2_fsync,
  163         .vop_getattr =          ext2_getattr,
  164         .vop_inactive =         ext2_inactive,
  165         .vop_kqfilter =         ext2fifo_kqfilter,
  166         .vop_print =            ext2_print,
  167         .vop_read =             VOP_PANIC,
  168         .vop_reclaim =          ext2_reclaim,
  169         .vop_setattr =          ext2_setattr,
  170         .vop_write =            VOP_PANIC,
  171         .vop_vptofh =           ext2_vptofh,
  172 };
  173 
  174 /*
  175  * A virgin directory (no blushing please).
  176  * Note that the type and namlen fields are reversed relative to ext2.
  177  * Also, we don't use `struct odirtemplate', since it would just cause
  178  * endianness problems.
  179  */
  180 static struct dirtemplate mastertemplate = {
  181         0, 12, 1, EXT2_FT_DIR, ".",
  182         0, DIRBLKSIZ - 12, 2, EXT2_FT_DIR, ".."
  183 };
  184 static struct dirtemplate omastertemplate = {
  185         0, 12, 1, EXT2_FT_UNKNOWN, ".",
  186         0, DIRBLKSIZ - 12, 2, EXT2_FT_UNKNOWN, ".."
  187 };
  188 
  189 static void
  190 ext2_itimes_locked(struct vnode *vp)
  191 {
  192         struct inode *ip;
  193         struct timespec ts;
  194 
  195         ASSERT_VI_LOCKED(vp, __func__); 
  196 
  197         ip = VTOI(vp);
  198         if ((ip->i_flag & (IN_ACCESS | IN_CHANGE | IN_UPDATE)) == 0)
  199                 return;
  200         if ((vp->v_type == VBLK || vp->v_type == VCHR))
  201                 ip->i_flag |= IN_LAZYMOD;
  202         else
  203                 ip->i_flag |= IN_MODIFIED;
  204         if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
  205                 vfs_timestamp(&ts);
  206                 if (ip->i_flag & IN_ACCESS) {
  207                         ip->i_atime = ts.tv_sec;
  208                         ip->i_atimensec = ts.tv_nsec;
  209                 }
  210                 if (ip->i_flag & IN_UPDATE) {
  211                         ip->i_mtime = ts.tv_sec;
  212                         ip->i_mtimensec = ts.tv_nsec;
  213                         ip->i_modrev++;
  214                 }
  215                 if (ip->i_flag & IN_CHANGE) {
  216                         ip->i_ctime = ts.tv_sec;
  217                         ip->i_ctimensec = ts.tv_nsec;
  218                 }
  219         }
  220         ip->i_flag &= ~(IN_ACCESS | IN_CHANGE | IN_UPDATE);
  221 }
  222 
  223 void
  224 ext2_itimes(struct vnode *vp)
  225 {
  226 
  227         VI_LOCK(vp);
  228         ext2_itimes_locked(vp);
  229         VI_UNLOCK(vp);
  230 }
  231 
  232 /*
  233  * Create a regular file
  234  */
  235 static int
  236 ext2_create(struct vop_create_args *ap)
  237 {
  238         int error;
  239 
  240         error =
  241             ext2_makeinode(MAKEIMODE(ap->a_vap->va_type, ap->a_vap->va_mode),
  242             ap->a_dvp, ap->a_vpp, ap->a_cnp);
  243         if (error != 0)
  244                 return (error);
  245         if ((ap->a_cnp->cn_flags & MAKEENTRY) != 0)
  246                 cache_enter(ap->a_dvp, *ap->a_vpp, ap->a_cnp);
  247         return (0);
  248 }
  249 
  250 static int
  251 ext2_open(struct vop_open_args *ap)
  252 {
  253 
  254         if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR)
  255                 return (EOPNOTSUPP);
  256 
  257         /*
  258          * Files marked append-only must be opened for appending.
  259          */
  260         if ((VTOI(ap->a_vp)->i_flags & APPEND) &&
  261             (ap->a_mode & (FWRITE | O_APPEND)) == FWRITE)
  262                 return (EPERM);
  263 
  264         vnode_create_vobject(ap->a_vp, VTOI(ap->a_vp)->i_size, ap->a_td);
  265 
  266         return (0);
  267 }
  268 
  269 /*
  270  * Close called.
  271  *
  272  * Update the times on the inode.
  273  */
  274 static int
  275 ext2_close(struct vop_close_args *ap)
  276 {
  277         struct vnode *vp = ap->a_vp;
  278 
  279         VI_LOCK(vp);
  280         if (vp->v_usecount > 1)
  281                 ext2_itimes_locked(vp);
  282         VI_UNLOCK(vp);
  283         return (0);
  284 }
  285 
  286 static int
  287 ext2_access(struct vop_access_args *ap)
  288 {
  289         struct vnode *vp = ap->a_vp;
  290         struct inode *ip = VTOI(vp);
  291         accmode_t accmode = ap->a_accmode;
  292         int error;
  293 
  294         if (vp->v_type == VBLK || vp->v_type == VCHR)
  295                 return (EOPNOTSUPP);
  296 
  297         /*
  298          * Disallow write attempts on read-only file systems;
  299          * unless the file is a socket, fifo, or a block or
  300          * character device resident on the file system.
  301          */
  302         if (accmode & VWRITE) {
  303                 switch (vp->v_type) {
  304                 case VDIR:
  305                 case VLNK:
  306                 case VREG:
  307                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  308                                 return (EROFS);
  309                         break;
  310                 default:
  311                         break;
  312                 }
  313         }
  314 
  315         /* If immutable bit set, nobody gets to write it. */
  316         if ((accmode & VWRITE) && (ip->i_flags & (SF_IMMUTABLE | SF_SNAPSHOT)))
  317                 return (EPERM);
  318 
  319         error = vaccess(vp->v_type, ip->i_mode, ip->i_uid, ip->i_gid,
  320             ap->a_accmode, ap->a_cred, NULL);
  321         return (error);
  322 }
  323 
  324 static int
  325 ext2_getattr(struct vop_getattr_args *ap)
  326 {
  327         struct vnode *vp = ap->a_vp;
  328         struct inode *ip = VTOI(vp);
  329         struct vattr *vap = ap->a_vap;
  330 
  331         ext2_itimes(vp);
  332         /*
  333          * Copy from inode table
  334          */
  335         vap->va_fsid = dev2udev(ip->i_devvp->v_rdev);
  336         vap->va_fileid = ip->i_number;
  337         vap->va_mode = ip->i_mode & ~IFMT;
  338         vap->va_nlink = ip->i_nlink;
  339         vap->va_uid = ip->i_uid;
  340         vap->va_gid = ip->i_gid;
  341         vap->va_rdev = ip->i_rdev;
  342         vap->va_size = ip->i_size;
  343         vap->va_atime.tv_sec = ip->i_atime;
  344         vap->va_atime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_atimensec : 0;
  345         vap->va_mtime.tv_sec = ip->i_mtime;
  346         vap->va_mtime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_mtimensec : 0;
  347         vap->va_ctime.tv_sec = ip->i_ctime;
  348         vap->va_ctime.tv_nsec = E2DI_HAS_XTIME(ip) ? ip->i_ctimensec : 0;
  349         if E2DI_HAS_XTIME(ip) {
  350                 vap->va_birthtime.tv_sec = ip->i_birthtime;
  351                 vap->va_birthtime.tv_nsec = ip->i_birthnsec;
  352         }
  353         vap->va_flags = ip->i_flags;
  354         vap->va_gen = ip->i_gen;
  355         vap->va_blocksize = vp->v_mount->mnt_stat.f_iosize;
  356         vap->va_bytes = dbtob((u_quad_t)ip->i_blocks);
  357         vap->va_type = IFTOVT(ip->i_mode);
  358         vap->va_filerev = ip->i_modrev;
  359         return (0);
  360 }
  361 
  362 /*
  363  * Set attribute vnode op. called from several syscalls
  364  */
  365 static int
  366 ext2_setattr(struct vop_setattr_args *ap)
  367 {
  368         struct vattr *vap = ap->a_vap;
  369         struct vnode *vp = ap->a_vp;
  370         struct inode *ip = VTOI(vp);
  371         struct ucred *cred = ap->a_cred;
  372         struct thread *td = curthread;
  373         int error;
  374 
  375         /*
  376          * Check for unsettable attributes.
  377          */
  378         if ((vap->va_type != VNON) || (vap->va_nlink != VNOVAL) ||
  379             (vap->va_fsid != VNOVAL) || (vap->va_fileid != VNOVAL) ||
  380             (vap->va_blocksize != VNOVAL) || (vap->va_rdev != VNOVAL) ||
  381             ((int)vap->va_bytes != VNOVAL) || (vap->va_gen != VNOVAL)) {
  382                 return (EINVAL);
  383         }
  384         if (vap->va_flags != VNOVAL) {
  385                 /* Disallow flags not supported by ext2fs. */
  386                 if(vap->va_flags & ~(SF_APPEND | SF_IMMUTABLE | UF_NODUMP))
  387                         return (EOPNOTSUPP);
  388 
  389                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  390                         return (EROFS);
  391                 /*
  392                  * Callers may only modify the file flags on objects they
  393                  * have VADMIN rights for.
  394                  */
  395                 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  396                         return (error);
  397                 /*
  398                  * Unprivileged processes and privileged processes in
  399                  * jail() are not permitted to unset system flags, or
  400                  * modify flags if any system flags are set.
  401                  * Privileged non-jail processes may not modify system flags
  402                  * if securelevel > 0 and any existing system flags are set.
  403                  */
  404                 if (!priv_check_cred(cred, PRIV_VFS_SYSFLAGS, 0)) {
  405                         if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND)) {
  406                                 error = securelevel_gt(cred, 0);
  407                                 if (error)
  408                                         return (error);
  409                         }
  410                 } else {
  411                         if (ip->i_flags & (SF_IMMUTABLE | SF_APPEND) ||
  412                             ((vap->va_flags ^ ip->i_flags) & SF_SETTABLE))
  413                                 return (EPERM);
  414                 }
  415                 ip->i_flags = vap->va_flags;
  416                 ip->i_flag |= IN_CHANGE;
  417                 if (ip->i_flags & (IMMUTABLE | APPEND))
  418                         return (0);
  419         }
  420         if (ip->i_flags & (IMMUTABLE | APPEND))
  421                 return (EPERM);
  422         /*
  423          * Go through the fields and update iff not VNOVAL.
  424          */
  425         if (vap->va_uid != (uid_t)VNOVAL || vap->va_gid != (gid_t)VNOVAL) {
  426                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  427                         return (EROFS);
  428                 if ((error = ext2_chown(vp, vap->va_uid, vap->va_gid, cred,
  429                     td)) != 0)
  430                         return (error);
  431         }
  432         if (vap->va_size != VNOVAL) {
  433                 /*
  434                  * Disallow write attempts on read-only file systems;
  435                  * unless the file is a socket, fifo, or a block or
  436                  * character device resident on the file system.
  437                  */
  438                 switch (vp->v_type) {
  439                 case VDIR:
  440                         return (EISDIR);
  441                 case VLNK:
  442                 case VREG:
  443                         if (vp->v_mount->mnt_flag & MNT_RDONLY)
  444                                 return (EROFS);
  445                         break;
  446                 default:
  447                         break;
  448                 }
  449                 if ((error = ext2_truncate(vp, vap->va_size, 0, cred, td)) != 0)
  450                         return (error);
  451         }
  452         if (vap->va_atime.tv_sec != VNOVAL || vap->va_mtime.tv_sec != VNOVAL) {
  453                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  454                         return (EROFS);
  455                 /*
  456                  * From utimes(2):
  457                  * If times is NULL, ... The caller must be the owner of
  458                  * the file, have permission to write the file, or be the
  459                  * super-user.
  460                  * If times is non-NULL, ... The caller must be the owner of
  461                  * the file or be the super-user.
  462                  */
  463                 if ((error = VOP_ACCESS(vp, VADMIN, cred, td)) &&
  464                     ((vap->va_vaflags & VA_UTIMES_NULL) == 0 ||
  465                     (error = VOP_ACCESS(vp, VWRITE, cred, td))))
  466                         return (error);
  467                 if (vap->va_atime.tv_sec != VNOVAL)
  468                         ip->i_flag |= IN_ACCESS;
  469                 if (vap->va_mtime.tv_sec != VNOVAL)
  470                         ip->i_flag |= IN_CHANGE | IN_UPDATE;
  471                 ext2_itimes(vp);
  472                 if (vap->va_atime.tv_sec != VNOVAL) {
  473                         ip->i_atime = vap->va_atime.tv_sec;
  474                         ip->i_atimensec = vap->va_atime.tv_nsec;
  475                 }
  476                 if (vap->va_mtime.tv_sec != VNOVAL) {
  477                         ip->i_mtime = vap->va_mtime.tv_sec;
  478                         ip->i_mtimensec = vap->va_mtime.tv_nsec;
  479                 }
  480                 ip->i_birthtime = vap->va_birthtime.tv_sec;
  481                 ip->i_birthnsec = vap->va_birthtime.tv_nsec;
  482                 error = ext2_update(vp, 0);
  483                 if (error)
  484                         return (error);
  485         }
  486         error = 0;
  487         if (vap->va_mode != (mode_t)VNOVAL) {
  488                 if (vp->v_mount->mnt_flag & MNT_RDONLY)
  489                         return (EROFS);
  490                 error = ext2_chmod(vp, (int)vap->va_mode, cred, td);
  491         }
  492         return (error);
  493 }
  494 
  495 /*
  496  * Change the mode on a file.
  497  * Inode must be locked before calling.
  498  */
  499 static int
  500 ext2_chmod(struct vnode *vp, int mode, struct ucred *cred, struct thread *td)
  501 {
  502         struct inode *ip = VTOI(vp);
  503         int error;
  504 
  505         /*
  506          * To modify the permissions on a file, must possess VADMIN
  507          * for that file.
  508          */
  509         if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  510                 return (error);
  511         /*
  512          * Privileged processes may set the sticky bit on non-directories,
  513          * as well as set the setgid bit on a file with a group that the
  514          * process is not a member of.
  515          */
  516         if (vp->v_type != VDIR && (mode & S_ISTXT)) {
  517                 error = priv_check_cred(cred, PRIV_VFS_STICKYFILE, 0);
  518                 if (error)
  519                         return (EFTYPE);
  520         }
  521         if (!groupmember(ip->i_gid, cred) && (mode & ISGID)) {
  522                 error = priv_check_cred(cred, PRIV_VFS_SETGID, 0);
  523                 if (error)
  524                         return (error);
  525         }
  526         ip->i_mode &= ~ALLPERMS;
  527         ip->i_mode |= (mode & ALLPERMS);
  528         ip->i_flag |= IN_CHANGE;
  529         return (0);
  530 }
  531 
  532 /*
  533  * Perform chown operation on inode ip;
  534  * inode must be locked prior to call.
  535  */
  536 static int
  537 ext2_chown(struct vnode *vp, uid_t uid, gid_t gid, struct ucred *cred,
  538     struct thread *td)
  539 {
  540         struct inode *ip = VTOI(vp);
  541         uid_t ouid;
  542         gid_t ogid;
  543         int error = 0;
  544 
  545         if (uid == (uid_t)VNOVAL)
  546                 uid = ip->i_uid;
  547         if (gid == (gid_t)VNOVAL)
  548                 gid = ip->i_gid;
  549         /*
  550          * To modify the ownership of a file, must possess VADMIN
  551          * for that file.
  552          */
  553         if ((error = VOP_ACCESS(vp, VADMIN, cred, td)))
  554                 return (error);
  555         /*
  556          * To change the owner of a file, or change the group of a file
  557          * to a group of which we are not a member, the caller must
  558          * have privilege.
  559          */
  560         if (uid != ip->i_uid || (gid != ip->i_gid &&
  561             !groupmember(gid, cred))) {
  562                 error = priv_check_cred(cred, PRIV_VFS_CHOWN, 0);
  563                 if (error)
  564                         return (error);
  565         }
  566         ogid = ip->i_gid;
  567         ouid = ip->i_uid;
  568         ip->i_gid = gid;
  569         ip->i_uid = uid;
  570         ip->i_flag |= IN_CHANGE;
  571         if ((ip->i_mode & (ISUID | ISGID)) && (ouid != uid || ogid != gid)) {
  572                 if (priv_check_cred(cred, PRIV_VFS_RETAINSUGID, 0) != 0)
  573                         ip->i_mode &= ~(ISUID | ISGID);
  574         }
  575         return (0);
  576 }
  577 
  578 /*
  579  * Synch an open file.
  580  */
  581 /* ARGSUSED */
  582 static int
  583 ext2_fsync(struct vop_fsync_args *ap)
  584 {
  585         /*
  586          * Flush all dirty buffers associated with a vnode.
  587          */
  588 
  589         vop_stdfsync(ap);
  590 
  591         return (ext2_update(ap->a_vp, ap->a_waitfor == MNT_WAIT));
  592 }
  593 
  594 /*
  595  * Mknod vnode call
  596  */
  597 /* ARGSUSED */
  598 static int
  599 ext2_mknod(struct vop_mknod_args *ap)
  600 {
  601         struct vattr *vap = ap->a_vap;
  602         struct vnode **vpp = ap->a_vpp;
  603         struct inode *ip;
  604         ino_t ino;
  605         int error;
  606 
  607         error = ext2_makeinode(MAKEIMODE(vap->va_type, vap->va_mode),
  608             ap->a_dvp, vpp, ap->a_cnp);
  609         if (error)
  610                 return (error);
  611         ip = VTOI(*vpp);
  612         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
  613         if (vap->va_rdev != VNOVAL) {
  614                 /*
  615                  * Want to be able to use this to make badblock
  616                  * inodes, so don't truncate the dev number.
  617                  */
  618                 ip->i_rdev = vap->va_rdev;
  619         }
  620         /*
  621          * Remove inode, then reload it through VFS_VGET so it is
  622          * checked to see if it is an alias of an existing entry in
  623          * the inode cache.      XXX I don't believe this is necessary now.
  624          */
  625         (*vpp)->v_type = VNON;
  626         ino = ip->i_number;     /* Save this before vgone() invalidates ip. */
  627         vgone(*vpp);
  628         vput(*vpp);
  629         error = VFS_VGET(ap->a_dvp->v_mount, ino, LK_EXCLUSIVE, vpp);
  630         if (error) {
  631                 *vpp = NULL;
  632                 return (error);
  633         }
  634         return (0);
  635 }
  636 
  637 static int
  638 ext2_remove(struct vop_remove_args *ap)
  639 {
  640         struct inode *ip;
  641         struct vnode *vp = ap->a_vp;
  642         struct vnode *dvp = ap->a_dvp;
  643         int error;
  644 
  645         ip = VTOI(vp);
  646         if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
  647             (VTOI(dvp)->i_flags & APPEND)) {
  648                 error = EPERM;
  649                 goto out;
  650         }
  651         error = ext2_dirremove(dvp, ap->a_cnp);
  652         if (error == 0) {
  653                 ip->i_nlink--;
  654                 ip->i_flag |= IN_CHANGE;
  655         }
  656 out:
  657         return (error);
  658 }
  659 
  660 /*
  661  * link vnode call
  662  */
  663 static int
  664 ext2_link(struct vop_link_args *ap)
  665 {
  666         struct vnode *vp = ap->a_vp;
  667         struct vnode *tdvp = ap->a_tdvp;
  668         struct componentname *cnp = ap->a_cnp;
  669         struct inode *ip;
  670         int error;
  671 
  672 #ifdef INVARIANTS
  673         if ((cnp->cn_flags & HASBUF) == 0)
  674                 panic("ext2_link: no name");
  675 #endif
  676         ip = VTOI(vp);
  677         if ((nlink_t)ip->i_nlink >= EXT2_LINK_MAX) {
  678                 error = EMLINK;
  679                 goto out;
  680         }
  681         if (ip->i_flags & (IMMUTABLE | APPEND)) {
  682                 error = EPERM;
  683                 goto out;
  684         }
  685         ip->i_nlink++;
  686         ip->i_flag |= IN_CHANGE;
  687         error = ext2_update(vp, !DOINGASYNC(vp));
  688         if (!error)
  689                 error = ext2_direnter(ip, tdvp, cnp);
  690         if (error) {
  691                 ip->i_nlink--;
  692                 ip->i_flag |= IN_CHANGE;
  693         }
  694 out:
  695         return (error);
  696 }
  697 
  698 /*
  699  * Rename system call.
  700  *      rename("foo", "bar");
  701  * is essentially
  702  *      unlink("bar");
  703  *      link("foo", "bar");
  704  *      unlink("foo");
  705  * but ``atomically''.  Can't do full commit without saving state in the
  706  * inode on disk which isn't feasible at this time.  Best we can do is
  707  * always guarantee the target exists.
  708  *
  709  * Basic algorithm is:
  710  *
  711  * 1) Bump link count on source while we're linking it to the
  712  *    target.  This also ensure the inode won't be deleted out
  713  *    from underneath us while we work (it may be truncated by
  714  *    a concurrent `trunc' or `open' for creation).
  715  * 2) Link source to destination.  If destination already exists,
  716  *    delete it first.
  717  * 3) Unlink source reference to inode if still around. If a
  718  *    directory was moved and the parent of the destination
  719  *    is different from the source, patch the ".." entry in the
  720  *    directory.
  721  */
  722 static int
  723 ext2_rename(struct vop_rename_args *ap)
  724 {
  725         struct vnode *tvp = ap->a_tvp;
  726         struct vnode *tdvp = ap->a_tdvp;
  727         struct vnode *fvp = ap->a_fvp;
  728         struct vnode *fdvp = ap->a_fdvp;
  729         struct componentname *tcnp = ap->a_tcnp;
  730         struct componentname *fcnp = ap->a_fcnp;
  731         struct inode *ip, *xp, *dp;
  732         struct dirtemplate dirbuf;
  733         int doingdirectory = 0, oldparent = 0, newparent = 0;
  734         int error = 0;
  735         u_char namlen;
  736 
  737 #ifdef INVARIANTS
  738         if ((tcnp->cn_flags & HASBUF) == 0 ||
  739             (fcnp->cn_flags & HASBUF) == 0)
  740                 panic("ext2_rename: no name");
  741 #endif
  742         /*
  743          * Check for cross-device rename.
  744          */
  745         if ((fvp->v_mount != tdvp->v_mount) ||
  746             (tvp && (fvp->v_mount != tvp->v_mount))) {
  747                 error = EXDEV;
  748 abortit:
  749                 if (tdvp == tvp)
  750                         vrele(tdvp);
  751                 else
  752                         vput(tdvp);
  753                 if (tvp)
  754                         vput(tvp);
  755                 vrele(fdvp);
  756                 vrele(fvp);
  757                 return (error);
  758         }
  759 
  760         if (tvp && ((VTOI(tvp)->i_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
  761             (VTOI(tdvp)->i_flags & APPEND))) {
  762                 error = EPERM;
  763                 goto abortit;
  764         }
  765 
  766         /*
  767          * Renaming a file to itself has no effect.  The upper layers should
  768          * not call us in that case.  Temporarily just warn if they do.
  769          */
  770         if (fvp == tvp) {
  771                 printf("ext2_rename: fvp == tvp (can't happen)\n");
  772                 error = 0;
  773                 goto abortit;
  774         }
  775 
  776         if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0)
  777                 goto abortit;
  778         dp = VTOI(fdvp);
  779         ip = VTOI(fvp);
  780         if (ip->i_nlink >= EXT2_LINK_MAX) {
  781                 VOP_UNLOCK(fvp, 0);
  782                 error = EMLINK;
  783                 goto abortit;
  784         }
  785         if ((ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))
  786             || (dp->i_flags & APPEND)) {
  787                 VOP_UNLOCK(fvp, 0);
  788                 error = EPERM;
  789                 goto abortit;
  790         }
  791         if ((ip->i_mode & IFMT) == IFDIR) {
  792                 /*
  793                  * Avoid ".", "..", and aliases of "." for obvious reasons.
  794                  */
  795                 if ((fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.') ||
  796                     dp == ip || (fcnp->cn_flags | tcnp->cn_flags) & ISDOTDOT ||
  797                     (ip->i_flag & IN_RENAME)) {
  798                         VOP_UNLOCK(fvp, 0);
  799                         error = EINVAL;
  800                         goto abortit;
  801                 }
  802                 ip->i_flag |= IN_RENAME;
  803                 oldparent = dp->i_number;
  804                 doingdirectory++;
  805         }
  806         vrele(fdvp);
  807 
  808         /*
  809          * When the target exists, both the directory
  810          * and target vnodes are returned locked.
  811          */
  812         dp = VTOI(tdvp);
  813         xp = NULL;
  814         if (tvp)
  815                 xp = VTOI(tvp);
  816 
  817         /*
  818          * 1) Bump link count while we're moving stuff
  819          *    around.  If we crash somewhere before
  820          *    completing our work, the link count
  821          *    may be wrong, but correctable.
  822          */
  823         ip->i_nlink++;
  824         ip->i_flag |= IN_CHANGE;
  825         if ((error = ext2_update(fvp, !DOINGASYNC(fvp))) != 0) {
  826                 VOP_UNLOCK(fvp, 0);
  827                 goto bad;
  828         }
  829 
  830         /*
  831          * If ".." must be changed (ie the directory gets a new
  832          * parent) then the source directory must not be in the
  833          * directory hierarchy above the target, as this would
  834          * orphan everything below the source directory. Also
  835          * the user must have write permission in the source so
  836          * as to be able to change "..". We must repeat the call
  837          * to namei, as the parent directory is unlocked by the
  838          * call to checkpath().
  839          */
  840         error = VOP_ACCESS(fvp, VWRITE, tcnp->cn_cred, tcnp->cn_thread);
  841         VOP_UNLOCK(fvp, 0);
  842         if (oldparent != dp->i_number)
  843                 newparent = dp->i_number;
  844         if (doingdirectory && newparent) {
  845                 if (error)      /* write access check above */
  846                         goto bad;
  847                 if (xp != NULL)
  848                         vput(tvp);
  849                 error = ext2_checkpath(ip, dp, tcnp->cn_cred);
  850                 if (error)
  851                         goto out;
  852                 VREF(tdvp);
  853                 error = relookup(tdvp, &tvp, tcnp);
  854                 if (error)
  855                         goto out;
  856                 vrele(tdvp);
  857                 dp = VTOI(tdvp);
  858                 xp = NULL;
  859                 if (tvp)
  860                         xp = VTOI(tvp);
  861         }
  862         /*
  863          * 2) If target doesn't exist, link the target
  864          *    to the source and unlink the source.
  865          *    Otherwise, rewrite the target directory
  866          *    entry to reference the source inode and
  867          *    expunge the original entry's existence.
  868          */
  869         if (xp == NULL) {
  870                 if (dp->i_devvp != ip->i_devvp)
  871                         panic("ext2_rename: EXDEV");
  872                 /*
  873                  * Account for ".." in new directory.
  874                  * When source and destination have the same
  875                  * parent we don't fool with the link count.
  876                  */
  877                 if (doingdirectory && newparent) {
  878                         if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
  879                                 error = EMLINK;
  880                                 goto bad;
  881                         }
  882                         dp->i_nlink++;
  883                         dp->i_flag |= IN_CHANGE;
  884                         error = ext2_update(tdvp, !DOINGASYNC(tdvp));
  885                         if (error)
  886                                 goto bad;
  887                 }
  888                 error = ext2_direnter(ip, tdvp, tcnp);
  889                 if (error) {
  890                         if (doingdirectory && newparent) {
  891                                 dp->i_nlink--;
  892                                 dp->i_flag |= IN_CHANGE;
  893                                 (void)ext2_update(tdvp, 1);
  894                         }
  895                         goto bad;
  896                 }
  897                 vput(tdvp);
  898         } else {
  899                 if (xp->i_devvp != dp->i_devvp || xp->i_devvp != ip->i_devvp)
  900                        panic("ext2_rename: EXDEV");
  901                 /*
  902                  * Short circuit rename(foo, foo).
  903                  */
  904                 if (xp->i_number == ip->i_number)
  905                         panic("ext2_rename: same file");
  906                 /*
  907                  * If the parent directory is "sticky", then the user must
  908                  * own the parent directory, or the destination of the rename,
  909                  * otherwise the destination may not be changed (except by
  910                  * root). This implements append-only directories.
  911                  */
  912                 if ((dp->i_mode & S_ISTXT) && tcnp->cn_cred->cr_uid != 0 &&
  913                     tcnp->cn_cred->cr_uid != dp->i_uid &&
  914                     xp->i_uid != tcnp->cn_cred->cr_uid) {
  915                         error = EPERM;
  916                         goto bad;
  917                 }
  918                 /*
  919                  * Target must be empty if a directory and have no links
  920                  * to it. Also, ensure source and target are compatible
  921                  * (both directories, or both not directories).
  922                  */
  923                 if ((xp->i_mode&IFMT) == IFDIR) {
  924                         if (! ext2_dirempty(xp, dp->i_number, tcnp->cn_cred) || 
  925                             xp->i_nlink > 2) {
  926                                 error = ENOTEMPTY;
  927                                 goto bad;
  928                         }
  929                         if (!doingdirectory) {
  930                                 error = ENOTDIR;
  931                                 goto bad;
  932                         }
  933                         cache_purge(tdvp);
  934                 } else if (doingdirectory) {
  935                         error = EISDIR;
  936                         goto bad;
  937                 }
  938                 error = ext2_dirrewrite(dp, ip, tcnp);
  939                 if (error)
  940                         goto bad;
  941                 /*
  942                  * If the target directory is in the same
  943                  * directory as the source directory,
  944                  * decrement the link count on the parent
  945                  * of the target directory.
  946                  */
  947                 if (doingdirectory && !newparent) {
  948                         dp->i_nlink--;
  949                         dp->i_flag |= IN_CHANGE;
  950                 }
  951                 vput(tdvp);
  952                 /*
  953                  * Adjust the link count of the target to
  954                  * reflect the dirrewrite above.  If this is
  955                  * a directory it is empty and there are
  956                  * no links to it, so we can squash the inode and
  957                  * any space associated with it.  We disallowed
  958                  * renaming over top of a directory with links to
  959                  * it above, as the remaining link would point to
  960                  * a directory without "." or ".." entries.
  961                  */
  962                 xp->i_nlink--;
  963                 if (doingdirectory) {
  964                         if (--xp->i_nlink != 0)
  965                                 panic("ext2_rename: linked directory");
  966                         error = ext2_truncate(tvp, (off_t)0, IO_SYNC,
  967                             tcnp->cn_cred, tcnp->cn_thread);
  968                 }
  969                 xp->i_flag |= IN_CHANGE;
  970                 vput(tvp);
  971                 xp = NULL;
  972         }
  973 
  974         /*
  975          * 3) Unlink the source.
  976          */
  977         fcnp->cn_flags &= ~MODMASK;
  978         fcnp->cn_flags |= LOCKPARENT | LOCKLEAF;
  979         VREF(fdvp);
  980         error = relookup(fdvp, &fvp, fcnp);
  981         if (error == 0)
  982                 vrele(fdvp);
  983         if (fvp != NULL) {
  984                 xp = VTOI(fvp);
  985                 dp = VTOI(fdvp);
  986         } else {
  987                 /*
  988                  * From name has disappeared.
  989                  */
  990                 if (doingdirectory)
  991                         panic("ext2_rename: lost dir entry");
  992                 vrele(ap->a_fvp);
  993                 return (0);
  994         }
  995         /*
  996          * Ensure that the directory entry still exists and has not
  997          * changed while the new name has been entered. If the source is
  998          * a file then the entry may have been unlinked or renamed. In
  999          * either case there is no further work to be done. If the source
 1000          * is a directory then it cannot have been rmdir'ed; its link
 1001          * count of three would cause a rmdir to fail with ENOTEMPTY.
 1002          * The IN_RENAME flag ensures that it cannot be moved by another
 1003          * rename.
 1004          */
 1005         if (xp != ip) {
 1006                 if (doingdirectory)
 1007                         panic("ext2_rename: lost dir entry");
 1008         } else {
 1009                 /*
 1010                  * If the source is a directory with a
 1011                  * new parent, the link count of the old
 1012                  * parent directory must be decremented
 1013                  * and ".." set to point to the new parent.
 1014                  */
 1015                 if (doingdirectory && newparent) {
 1016                         dp->i_nlink--;
 1017                         dp->i_flag |= IN_CHANGE;
 1018                         error = vn_rdwr(UIO_READ, fvp, (caddr_t)&dirbuf,
 1019                                 sizeof(struct dirtemplate), (off_t)0,
 1020                                 UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
 1021                                 tcnp->cn_cred, NOCRED, NULL, NULL);
 1022                         if (error == 0) {
 1023                                 /* Like ufs little-endian: */
 1024                                 namlen = dirbuf.dotdot_type;
 1025                                 if (namlen != 2 ||
 1026                                     dirbuf.dotdot_name[0] != '.' ||
 1027                                     dirbuf.dotdot_name[1] != '.') {
 1028                                         ext2_dirbad(xp, (doff_t)12,
 1029                                             "rename: mangled dir");
 1030                                 } else {
 1031                                         dirbuf.dotdot_ino = newparent;
 1032                                         (void) vn_rdwr(UIO_WRITE, fvp,
 1033                                             (caddr_t)&dirbuf,
 1034                                             sizeof(struct dirtemplate),
 1035                                             (off_t)0, UIO_SYSSPACE,
 1036                                             IO_NODELOCKED | IO_SYNC |
 1037                                             IO_NOMACCHECK, tcnp->cn_cred,
 1038                                             NOCRED, NULL, NULL);
 1039                                         cache_purge(fdvp);
 1040                                 }
 1041                         }
 1042                 }
 1043                 error = ext2_dirremove(fdvp, fcnp);
 1044                 if (!error) {
 1045                         xp->i_nlink--;
 1046                         xp->i_flag |= IN_CHANGE;
 1047                 }
 1048                 xp->i_flag &= ~IN_RENAME;
 1049         }
 1050         if (dp)
 1051                 vput(fdvp);
 1052         if (xp)
 1053                 vput(fvp);
 1054         vrele(ap->a_fvp);
 1055         return (error);
 1056 
 1057 bad:
 1058         if (xp)
 1059                 vput(ITOV(xp));
 1060         vput(ITOV(dp));
 1061 out:
 1062         if (doingdirectory)
 1063                 ip->i_flag &= ~IN_RENAME;
 1064         if (vn_lock(fvp, LK_EXCLUSIVE) == 0) {
 1065                 ip->i_nlink--;
 1066                 ip->i_flag |= IN_CHANGE;
 1067                 ip->i_flag &= ~IN_RENAME;
 1068                 vput(fvp);
 1069         } else
 1070                 vrele(fvp);
 1071         return (error);
 1072 }
 1073 
 1074 /*
 1075  * Mkdir system call
 1076  */
 1077 static int
 1078 ext2_mkdir(struct vop_mkdir_args *ap)
 1079 {
 1080         struct vnode *dvp = ap->a_dvp;
 1081         struct vattr *vap = ap->a_vap;
 1082         struct componentname *cnp = ap->a_cnp;
 1083         struct inode *ip, *dp;
 1084         struct vnode *tvp;
 1085         struct dirtemplate dirtemplate, *dtp;
 1086         int error, dmode;
 1087 
 1088 #ifdef INVARIANTS
 1089         if ((cnp->cn_flags & HASBUF) == 0)
 1090                 panic("ext2_mkdir: no name");
 1091 #endif
 1092         dp = VTOI(dvp);
 1093         if ((nlink_t)dp->i_nlink >= EXT2_LINK_MAX) {
 1094                 error = EMLINK;
 1095                 goto out;
 1096         }
 1097         dmode = vap->va_mode & 0777;
 1098         dmode |= IFDIR;
 1099         /*
 1100          * Must simulate part of ext2_makeinode here to acquire the inode,
 1101          * but not have it entered in the parent directory. The entry is
 1102          * made later after writing "." and ".." entries.
 1103          */
 1104         error = ext2_valloc(dvp, dmode, cnp->cn_cred, &tvp);
 1105         if (error)
 1106                 goto out;
 1107         ip = VTOI(tvp);
 1108         ip->i_gid = dp->i_gid;
 1109 #ifdef SUIDDIR
 1110         {
 1111                 /*
 1112                  * if we are hacking owners here, (only do this where told to)
 1113                  * and we are not giving it TOO root, (would subvert quotas)
 1114                  * then go ahead and give it to the other user.
 1115                  * The new directory also inherits the SUID bit. 
 1116                  * If user's UID and dir UID are the same,
 1117                  * 'give it away' so that the SUID is still forced on.
 1118                  */
 1119                 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
 1120                    (dp->i_mode & ISUID) && dp->i_uid) {
 1121                         dmode |= ISUID;
 1122                         ip->i_uid = dp->i_uid;
 1123                 } else {
 1124                         ip->i_uid = cnp->cn_cred->cr_uid;
 1125                 }
 1126         }
 1127 #else
 1128         ip->i_uid = cnp->cn_cred->cr_uid;
 1129 #endif
 1130         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
 1131         ip->i_mode = dmode;
 1132         tvp->v_type = VDIR;     /* Rest init'd in getnewvnode(). */
 1133         ip->i_nlink = 2;
 1134         if (cnp->cn_flags & ISWHITEOUT)
 1135                 ip->i_flags |= UF_OPAQUE;
 1136         error = ext2_update(tvp, 1);
 1137 
 1138         /*
 1139          * Bump link count in parent directory
 1140          * to reflect work done below.  Should
 1141          * be done before reference is created
 1142          * so reparation is possible if we crash.
 1143          */
 1144         dp->i_nlink++;
 1145         dp->i_flag |= IN_CHANGE;
 1146         error = ext2_update(dvp, !DOINGASYNC(dvp));
 1147         if (error)
 1148                 goto bad;
 1149 
 1150         /* Initialize directory with "." and ".." from static template. */
 1151         if (EXT2_HAS_INCOMPAT_FEATURE(ip->i_e2fs,
 1152             EXT2F_INCOMPAT_FTYPE))
 1153                 dtp = &mastertemplate;
 1154         else
 1155                 dtp = &omastertemplate;
 1156         dirtemplate = *dtp;
 1157         dirtemplate.dot_ino = ip->i_number;
 1158         dirtemplate.dotdot_ino = dp->i_number;
 1159         /* note that in ext2 DIRBLKSIZ == blocksize, not DEV_BSIZE 
 1160          * so let's just redefine it - for this function only
 1161          */
 1162 #undef  DIRBLKSIZ 
 1163 #define DIRBLKSIZ  VTOI(dvp)->i_e2fs->e2fs_bsize
 1164         dirtemplate.dotdot_reclen = DIRBLKSIZ - 12;
 1165         error = vn_rdwr(UIO_WRITE, tvp, (caddr_t)&dirtemplate,
 1166             sizeof(dirtemplate), (off_t)0, UIO_SYSSPACE,
 1167             IO_NODELOCKED | IO_SYNC | IO_NOMACCHECK, cnp->cn_cred, NOCRED,
 1168             NULL, NULL);
 1169         if (error) {
 1170                 dp->i_nlink--;
 1171                 dp->i_flag |= IN_CHANGE;
 1172                 goto bad;
 1173         }
 1174         if (DIRBLKSIZ > VFSTOEXT2(dvp->v_mount)->um_mountp->mnt_stat.f_bsize)
 1175                 /* XXX should grow with balloc() */
 1176                 panic("ext2_mkdir: blksize");
 1177         else {
 1178                 ip->i_size = DIRBLKSIZ;
 1179                 ip->i_flag |= IN_CHANGE;
 1180         }
 1181 
 1182         /* Directory set up, now install its entry in the parent directory. */
 1183         error = ext2_direnter(ip, dvp, cnp);
 1184         if (error) {
 1185                 dp->i_nlink--;
 1186                 dp->i_flag |= IN_CHANGE;
 1187         }
 1188 bad:
 1189         /*
 1190          * No need to do an explicit VOP_TRUNCATE here, vrele will do this
 1191          * for us because we set the link count to 0.
 1192          */
 1193         if (error) {
 1194                 ip->i_nlink = 0;
 1195                 ip->i_flag |= IN_CHANGE;
 1196                 vput(tvp);
 1197         } else
 1198                 *ap->a_vpp = tvp;
 1199 out:
 1200         return (error);
 1201 #undef  DIRBLKSIZ
 1202 #define DIRBLKSIZ  DEV_BSIZE
 1203 }
 1204 
 1205 /*
 1206  * Rmdir system call.
 1207  */
 1208 static int
 1209 ext2_rmdir(struct vop_rmdir_args *ap)
 1210 {
 1211         struct vnode *vp = ap->a_vp;
 1212         struct vnode *dvp = ap->a_dvp;
 1213         struct componentname *cnp = ap->a_cnp;
 1214         struct inode *ip, *dp;
 1215         int error;
 1216 
 1217         ip = VTOI(vp);
 1218         dp = VTOI(dvp);
 1219 
 1220         /*
 1221          * Verify the directory is empty (and valid).
 1222          * (Rmdir ".." won't be valid since
 1223          *  ".." will contain a reference to
 1224          *  the current directory and thus be
 1225          *  non-empty.)
 1226          */
 1227         if (ip->i_nlink != 2 || !ext2_dirempty(ip, dp->i_number, cnp->cn_cred)) {
 1228                 error = ENOTEMPTY;
 1229                 goto out;
 1230         }
 1231         if ((dp->i_flags & APPEND)
 1232             || (ip->i_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
 1233                 error = EPERM;
 1234                 goto out;
 1235         }
 1236         /*
 1237          * Delete reference to directory before purging
 1238          * inode.  If we crash in between, the directory
 1239          * will be reattached to lost+found,
 1240          */
 1241         error = ext2_dirremove(dvp, cnp);
 1242         if (error)
 1243                 goto out;
 1244         dp->i_nlink--;
 1245         dp->i_flag |= IN_CHANGE;
 1246         cache_purge(dvp);
 1247         VOP_UNLOCK(dvp, 0);
 1248         /*
 1249          * Truncate inode.  The only stuff left
 1250          * in the directory is "." and "..".  The
 1251          * "." reference is inconsequential since
 1252          * we're quashing it.  The ".." reference
 1253          * has already been adjusted above.  We've
 1254          * removed the "." reference and the reference
 1255          * in the parent directory, but there may be
 1256          * other hard links so decrement by 2 and
 1257          * worry about them later.
 1258          */
 1259         ip->i_nlink -= 2;
 1260         error = ext2_truncate(vp, (off_t)0, IO_SYNC, cnp->cn_cred,
 1261             cnp->cn_thread);
 1262         cache_purge(ITOV(ip));
 1263         if (vn_lock(dvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
 1264                 VOP_UNLOCK(vp, 0);
 1265                 vn_lock(dvp, LK_EXCLUSIVE | LK_RETRY);
 1266                 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 1267         }
 1268 out:
 1269         return (error);
 1270 }
 1271 
 1272 /*
 1273  * symlink -- make a symbolic link
 1274  */
 1275 static int
 1276 ext2_symlink(struct vop_symlink_args *ap)
 1277 {
 1278         struct vnode *vp, **vpp = ap->a_vpp;
 1279         struct inode *ip;
 1280         int len, error;
 1281 
 1282         error = ext2_makeinode(IFLNK | ap->a_vap->va_mode, ap->a_dvp,
 1283             vpp, ap->a_cnp);
 1284         if (error)
 1285                 return (error);
 1286         vp = *vpp;
 1287         len = strlen(ap->a_target);
 1288         if (len < vp->v_mount->mnt_maxsymlinklen) {
 1289                 ip = VTOI(vp);
 1290                 bcopy(ap->a_target, (char *)ip->i_shortlink, len);
 1291                 ip->i_size = len;
 1292                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
 1293         } else
 1294                 error = vn_rdwr(UIO_WRITE, vp, ap->a_target, len, (off_t)0,
 1295                     UIO_SYSSPACE, IO_NODELOCKED | IO_NOMACCHECK,
 1296                     ap->a_cnp->cn_cred, NOCRED, NULL, NULL);
 1297         if (error)
 1298                 vput(vp);
 1299         return (error);
 1300 }
 1301 
 1302 /*
 1303  * Return target name of a symbolic link
 1304  */
 1305 static int
 1306 ext2_readlink(struct vop_readlink_args *ap)
 1307 {
 1308         struct vnode *vp = ap->a_vp;
 1309         struct inode *ip = VTOI(vp);
 1310         int isize;
 1311 
 1312         isize = ip->i_size;
 1313         if (isize < vp->v_mount->mnt_maxsymlinklen) {
 1314                 uiomove((char *)ip->i_shortlink, isize, ap->a_uio);
 1315                 return (0);
 1316         }
 1317         return (VOP_READ(vp, ap->a_uio, 0, ap->a_cred));
 1318 }
 1319 
 1320 /*
 1321  * Calculate the logical to physical mapping if not done already,
 1322  * then call the device strategy routine.
 1323  *
 1324  * In order to be able to swap to a file, the ext2_bmaparray() operation may not
 1325  * deadlock on memory.  See ext2_bmap() for details.
 1326  */
 1327 static int
 1328 ext2_strategy(struct vop_strategy_args *ap)
 1329 {
 1330         struct buf *bp = ap->a_bp;
 1331         struct vnode *vp = ap->a_vp;
 1332         struct bufobj *bo;
 1333         daddr_t blkno;
 1334         int error;
 1335 
 1336         if (vp->v_type == VBLK || vp->v_type == VCHR)
 1337                 panic("ext2_strategy: spec");
 1338         if (bp->b_blkno == bp->b_lblkno) {
 1339                 error = ext2_bmaparray(vp, bp->b_lblkno, &blkno, NULL, NULL);
 1340                 bp->b_blkno = blkno;
 1341                 if (error) {
 1342                         bp->b_error = error;
 1343                         bp->b_ioflags |= BIO_ERROR;
 1344                         bufdone(bp);
 1345                         return (0);
 1346                 }
 1347                 if ((long)bp->b_blkno == -1)
 1348                         vfs_bio_clrbuf(bp);
 1349         }
 1350         if ((long)bp->b_blkno == -1) {
 1351                 bufdone(bp);
 1352                 return (0);
 1353         }
 1354         bp->b_iooffset = dbtob(bp->b_blkno);
 1355         bo = VFSTOEXT2(vp->v_mount)->um_bo;
 1356         BO_STRATEGY(bo, bp);
 1357         return (0);
 1358 }
 1359 
 1360 /*
 1361  * Print out the contents of an inode.
 1362  */
 1363 static int
 1364 ext2_print(struct vop_print_args *ap)
 1365 {
 1366         struct vnode *vp = ap->a_vp;
 1367         struct inode *ip = VTOI(vp);
 1368 
 1369         vn_printf(ip->i_devvp, "\tino %lu", (u_long)ip->i_number);
 1370         if (vp->v_type == VFIFO)
 1371                 fifo_printinfo(vp);
 1372         printf("\n");
 1373         return (0);
 1374 }
 1375 
 1376 /*
 1377  * Close wrapper for fifos.
 1378  *
 1379  * Update the times on the inode then do device close.
 1380  */
 1381 static int
 1382 ext2fifo_close(struct vop_close_args *ap)
 1383 {
 1384         struct vnode *vp = ap->a_vp;
 1385 
 1386         VI_LOCK(vp);
 1387         if (vp->v_usecount > 1)
 1388                 ext2_itimes_locked(vp);
 1389         VI_UNLOCK(vp);
 1390         return (fifo_specops.vop_close(ap));
 1391 }
 1392 
 1393 /*
 1394  * Kqfilter wrapper for fifos.
 1395  *
 1396  * Fall through to ext2 kqfilter routines if needed 
 1397  */
 1398 static int
 1399 ext2fifo_kqfilter(struct vop_kqfilter_args *ap)
 1400 {
 1401         int error;
 1402 
 1403         error = fifo_specops.vop_kqfilter(ap);
 1404         if (error)
 1405                 error = vfs_kqfilter(ap);
 1406         return (error);
 1407 }
 1408 
 1409 /*
 1410  * Return POSIX pathconf information applicable to ext2 filesystems.
 1411  */
 1412 static int
 1413 ext2_pathconf(struct vop_pathconf_args *ap)
 1414 {
 1415         int error = 0;
 1416 
 1417         switch (ap->a_name) {
 1418         case _PC_LINK_MAX:
 1419                 *ap->a_retval = EXT2_LINK_MAX;
 1420                 break;
 1421         case _PC_NAME_MAX:
 1422                 *ap->a_retval = NAME_MAX;
 1423                 break;
 1424         case _PC_PATH_MAX:
 1425                 *ap->a_retval = PATH_MAX;
 1426                 break;
 1427         case _PC_PIPE_BUF:
 1428                 *ap->a_retval = PIPE_BUF;
 1429                 break;
 1430         case _PC_CHOWN_RESTRICTED:
 1431                 *ap->a_retval = 1;
 1432                 break;
 1433         case _PC_NO_TRUNC:
 1434                 *ap->a_retval = 1;
 1435                 break;
 1436         case _PC_MIN_HOLE_SIZE:
 1437                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 1438                 break;
 1439         case _PC_ASYNC_IO:
 1440                 /* _PC_ASYNC_IO should have been handled by upper layers. */
 1441                 KASSERT(0, ("_PC_ASYNC_IO should not get here"));
 1442                 error = EINVAL;
 1443                 break;
 1444         case _PC_PRIO_IO:
 1445                 *ap->a_retval = 0;
 1446                 break;
 1447         case _PC_SYNC_IO:
 1448                 *ap->a_retval = 0;
 1449                 break;
 1450         case _PC_ALLOC_SIZE_MIN:
 1451                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_bsize;
 1452                 break;
 1453         case _PC_FILESIZEBITS:
 1454                 *ap->a_retval = 64;
 1455                 break;
 1456         case _PC_REC_INCR_XFER_SIZE:
 1457                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 1458                 break;
 1459         case _PC_REC_MAX_XFER_SIZE:
 1460                 *ap->a_retval = -1; /* means ``unlimited'' */
 1461                 break;
 1462         case _PC_REC_MIN_XFER_SIZE:
 1463                 *ap->a_retval = ap->a_vp->v_mount->mnt_stat.f_iosize;
 1464                 break;
 1465         case _PC_REC_XFER_ALIGN:
 1466                 *ap->a_retval = PAGE_SIZE;
 1467                 break;
 1468         case _PC_SYMLINK_MAX:
 1469                 *ap->a_retval = MAXPATHLEN;
 1470                 break;
 1471 
 1472         default:
 1473                 error = EINVAL;
 1474                 break;
 1475         }
 1476         return (error);
 1477 }
 1478 
 1479 /*
 1480  * Vnode pointer to File handle
 1481  */
 1482 /* ARGSUSED */
 1483 static int
 1484 ext2_vptofh(struct vop_vptofh_args *ap)
 1485 {
 1486         struct inode *ip;
 1487         struct ufid *ufhp;
 1488 
 1489         ip = VTOI(ap->a_vp);
 1490         ufhp = (struct ufid *)ap->a_fhp;
 1491         ufhp->ufid_len = sizeof(struct ufid);
 1492         ufhp->ufid_ino = ip->i_number;
 1493         ufhp->ufid_gen = ip->i_gen;
 1494         return (0);
 1495 }
 1496 
 1497 /*
 1498  * Initialize the vnode associated with a new inode, handle aliased
 1499  * vnodes.
 1500  */
 1501 int
 1502 ext2_vinit(struct mount *mntp, struct vop_vector *fifoops, struct vnode **vpp)
 1503 {
 1504         struct inode *ip;
 1505         struct vnode *vp;
 1506 
 1507         vp = *vpp;
 1508         ip = VTOI(vp);
 1509         vp->v_type = IFTOVT(ip->i_mode);
 1510         if (vp->v_type == VFIFO)
 1511                 vp->v_op = fifoops;
 1512 
 1513         if (ip->i_number == EXT2_ROOTINO)
 1514                 vp->v_vflag |= VV_ROOT;
 1515         ip->i_modrev = init_va_filerev();
 1516         *vpp = vp;
 1517         return (0);
 1518 }
 1519 
 1520 /*
 1521  * Allocate a new inode.
 1522  */
 1523 static int
 1524 ext2_makeinode(int mode, struct vnode *dvp, struct vnode **vpp,
 1525     struct componentname *cnp)
 1526 {
 1527         struct inode *ip, *pdir;
 1528         struct vnode *tvp;
 1529         int error;
 1530 
 1531         pdir = VTOI(dvp);
 1532 #ifdef INVARIANTS
 1533         if ((cnp->cn_flags & HASBUF) == 0)
 1534                 panic("ext2_makeinode: no name");
 1535 #endif
 1536         *vpp = NULL;
 1537         if ((mode & IFMT) == 0)
 1538                 mode |= IFREG;
 1539 
 1540         error = ext2_valloc(dvp, mode, cnp->cn_cred, &tvp);
 1541         if (error) {
 1542                 return (error);
 1543         }
 1544         ip = VTOI(tvp);
 1545         ip->i_gid = pdir->i_gid;
 1546 #ifdef SUIDDIR
 1547         {
 1548                 /*
 1549                  * if we are
 1550                  * not the owner of the directory,
 1551                  * and we are hacking owners here, (only do this where told to)
 1552                  * and we are not giving it TOO root, (would subvert quotas)
 1553                  * then go ahead and give it to the other user.
 1554                  * Note that this drops off the execute bits for security.
 1555                  */
 1556                 if ( (dvp->v_mount->mnt_flag & MNT_SUIDDIR) &&
 1557                      (pdir->i_mode & ISUID) &&
 1558                      (pdir->i_uid != cnp->cn_cred->cr_uid) && pdir->i_uid) {
 1559                         ip->i_uid = pdir->i_uid;
 1560                         mode &= ~07111;
 1561                 } else {
 1562                         ip->i_uid = cnp->cn_cred->cr_uid;
 1563                 }
 1564         }
 1565 #else
 1566         ip->i_uid = cnp->cn_cred->cr_uid;
 1567 #endif
 1568         ip->i_flag |= IN_ACCESS | IN_CHANGE | IN_UPDATE;
 1569         ip->i_mode = mode;
 1570         tvp->v_type = IFTOVT(mode);     /* Rest init'd in getnewvnode(). */
 1571         ip->i_nlink = 1;
 1572         if ((ip->i_mode & ISGID) && !groupmember(ip->i_gid, cnp->cn_cred)) {
 1573                 if (priv_check_cred(cnp->cn_cred, PRIV_VFS_RETAINSUGID, 0))
 1574                         ip->i_mode &= ~ISGID;
 1575         }
 1576 
 1577         if (cnp->cn_flags & ISWHITEOUT)
 1578                 ip->i_flags |= UF_OPAQUE;
 1579 
 1580         /*
 1581          * Make sure inode goes to disk before directory entry.
 1582          */
 1583         error = ext2_update(tvp, !DOINGASYNC(tvp));
 1584         if (error)
 1585                 goto bad;
 1586         error = ext2_direnter(ip, dvp, cnp);
 1587         if (error)
 1588                 goto bad;
 1589 
 1590         *vpp = tvp;
 1591         return (0);
 1592 
 1593 bad:
 1594         /*
 1595          * Write error occurred trying to update the inode
 1596          * or the directory so must deallocate the inode.
 1597          */
 1598         ip->i_nlink = 0;
 1599         ip->i_flag |= IN_CHANGE;
 1600         vput(tvp);
 1601         return (error);
 1602 }
 1603 
 1604 /*
 1605  * Vnode op for reading.
 1606  */
 1607 static int
 1608 ext2_read(struct vop_read_args *ap)
 1609 {
 1610         struct vnode *vp;
 1611         struct inode *ip;
 1612         int error;
 1613 
 1614         vp = ap->a_vp;
 1615         ip = VTOI(vp);
 1616 
 1617         /*EXT4_EXT_LOCK(ip);*/
 1618         if (ip->i_flag & IN_E4EXTENTS)
 1619                 error = ext4_ext_read(ap);
 1620         else
 1621                 error = ext2_ind_read(ap);
 1622         /*EXT4_EXT_UNLOCK(ip);*/
 1623         return (error);
 1624 }
 1625 
 1626 /*
 1627  * Vnode op for reading.
 1628  */
 1629 static int
 1630 ext2_ind_read(struct vop_read_args *ap)
 1631 {
 1632         struct vnode *vp;
 1633         struct inode *ip;
 1634         struct uio *uio;
 1635         struct m_ext2fs *fs;
 1636         struct buf *bp;
 1637         daddr_t lbn, nextlbn;
 1638         off_t bytesinfile;
 1639         long size, xfersize, blkoffset;
 1640         int error, orig_resid, seqcount;
 1641         int ioflag;
 1642 
 1643         vp = ap->a_vp;
 1644         uio = ap->a_uio;
 1645         ioflag = ap->a_ioflag;
 1646 
 1647         seqcount = ap->a_ioflag >> IO_SEQSHIFT;
 1648         ip = VTOI(vp);
 1649 
 1650 #ifdef INVARIANTS
 1651         if (uio->uio_rw != UIO_READ)
 1652                 panic("%s: mode", "ext2_read");
 1653 
 1654         if (vp->v_type == VLNK) {
 1655                 if ((int)ip->i_size < vp->v_mount->mnt_maxsymlinklen)
 1656                         panic("%s: short symlink", "ext2_read");
 1657         } else if (vp->v_type != VREG && vp->v_type != VDIR)
 1658                 panic("%s: type %d", "ext2_read", vp->v_type);
 1659 #endif
 1660         orig_resid = uio->uio_resid;
 1661         KASSERT(orig_resid >= 0, ("ext2_read: uio->uio_resid < 0"));
 1662         if (orig_resid == 0)
 1663                 return (0);
 1664         KASSERT(uio->uio_offset >= 0, ("ext2_read: uio->uio_offset < 0"));
 1665         fs = ip->i_e2fs;
 1666         if (uio->uio_offset < ip->i_size &&
 1667             uio->uio_offset >= fs->e2fs_maxfilesize)
 1668                 return (EOVERFLOW);
 1669 
 1670         for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) {
 1671                 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
 1672                         break;
 1673                 lbn = lblkno(fs, uio->uio_offset);
 1674                 nextlbn = lbn + 1;
 1675                 size = blksize(fs, ip, lbn);
 1676                 blkoffset = blkoff(fs, uio->uio_offset);
 1677 
 1678                 xfersize = fs->e2fs_fsize - blkoffset;
 1679                 if (uio->uio_resid < xfersize)
 1680                         xfersize = uio->uio_resid;
 1681                 if (bytesinfile < xfersize)
 1682                         xfersize = bytesinfile;
 1683 
 1684                 if (lblktosize(fs, nextlbn) >= ip->i_size)
 1685                         error = bread(vp, lbn, size, NOCRED, &bp);
 1686                 else if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
 1687                         error = cluster_read(vp, ip->i_size, lbn, size,
 1688                             NOCRED, blkoffset + uio->uio_resid, seqcount,
 1689                             0, &bp);
 1690                 } else if (seqcount > 1) {
 1691                         u_int nextsize = blksize(fs, ip, nextlbn);
 1692                         error = breadn(vp, lbn,
 1693                             size, &nextlbn, &nextsize, 1, NOCRED, &bp);
 1694                 } else
 1695                         error = bread(vp, lbn, size, NOCRED, &bp);
 1696                 if (error) {
 1697                         brelse(bp);
 1698                         bp = NULL;
 1699                         break;
 1700                 }
 1701 
 1702                 /*
 1703                  * If IO_DIRECT then set B_DIRECT for the buffer.  This
 1704                  * will cause us to attempt to release the buffer later on
 1705                  * and will cause the buffer cache to attempt to free the
 1706                  * underlying pages.
 1707                  */
 1708                 if (ioflag & IO_DIRECT)
 1709                         bp->b_flags |= B_DIRECT;
 1710 
 1711                 /*
 1712                  * We should only get non-zero b_resid when an I/O error
 1713                  * has occurred, which should cause us to break above.
 1714                  * However, if the short read did not cause an error,
 1715                  * then we want to ensure that we do not uiomove bad
 1716                  * or uninitialized data.
 1717                  */
 1718                 size -= bp->b_resid;
 1719                 if (size < xfersize) {
 1720                         if (size == 0)
 1721                                 break;
 1722                         xfersize = size;
 1723                 }
 1724                 error = uiomove((char *)bp->b_data + blkoffset,
 1725                         (int)xfersize, uio);
 1726                 if (error)
 1727                         break;
 1728 
 1729                 if (ioflag & (IO_VMIO|IO_DIRECT)) {
 1730                         /*
 1731                          * If it's VMIO or direct I/O, then we don't
 1732                          * need the buf, mark it available for
 1733                          * freeing. If it's non-direct VMIO, the VM has
 1734                          * the data.
 1735                          */
 1736                         bp->b_flags |= B_RELBUF;
 1737                         brelse(bp);
 1738                 } else {
 1739                         /*
 1740                          * Otherwise let whoever
 1741                          * made the request take care of
 1742                          * freeing it. We just queue
 1743                          * it onto another list.
 1744                          */
 1745                         bqrelse(bp);
 1746                 }
 1747         }
 1748 
 1749         /* 
 1750          * This can only happen in the case of an error
 1751          * because the loop above resets bp to NULL on each iteration
 1752          * and on normal completion has not set a new value into it.
 1753          * so it must have come from a 'break' statement
 1754          */
 1755         if (bp != NULL) {
 1756                 if (ioflag & (IO_VMIO|IO_DIRECT)) {
 1757                         bp->b_flags |= B_RELBUF;
 1758                         brelse(bp);
 1759                 } else {
 1760                         bqrelse(bp);
 1761                 }
 1762         }
 1763 
 1764         if ((error == 0 || uio->uio_resid != orig_resid) &&
 1765             (vp->v_mount->mnt_flag & (MNT_NOATIME | MNT_RDONLY)) == 0)
 1766                 ip->i_flag |= IN_ACCESS;
 1767         return (error);
 1768 }
 1769 
 1770 static int
 1771 ext2_ioctl(struct vop_ioctl_args *ap)
 1772 {
 1773 
 1774         switch (ap->a_command) {
 1775         case FIOSEEKDATA:
 1776         case FIOSEEKHOLE:
 1777                 return (vn_bmap_seekhole(ap->a_vp, ap->a_command,
 1778                     (off_t *)ap->a_data, ap->a_cred));
 1779         default:
 1780                 return (ENOTTY);
 1781         }
 1782 }
 1783 
 1784 /*
 1785  * this function handles ext4 extents block mapping
 1786  */
 1787 static int
 1788 ext4_ext_read(struct vop_read_args *ap)
 1789 {
 1790         struct vnode *vp;
 1791         struct inode *ip;
 1792         struct uio *uio;
 1793         struct m_ext2fs *fs;
 1794         struct buf *bp;
 1795         struct ext4_extent nex, *ep;
 1796         struct ext4_extent_path path;
 1797         daddr_t lbn, newblk;
 1798         off_t bytesinfile;
 1799         int cache_type;
 1800         ssize_t orig_resid;
 1801         int error;
 1802         long size, xfersize, blkoffset;
 1803 
 1804         vp = ap->a_vp;
 1805         ip = VTOI(vp);
 1806         uio = ap->a_uio;
 1807         memset(&path, 0, sizeof(path));
 1808 
 1809         orig_resid = uio->uio_resid;
 1810         KASSERT(orig_resid >= 0, ("%s: uio->uio_resid < 0", __func__));
 1811         if (orig_resid == 0)
 1812                 return (0);
 1813         KASSERT(uio->uio_offset >= 0, ("%s: uio->uio_offset < 0", __func__));
 1814         fs = ip->i_e2fs;
 1815         if (uio->uio_offset < ip->i_size && uio->uio_offset >= fs->e2fs_maxfilesize)
 1816                 return (EOVERFLOW);
 1817 
 1818         while (uio->uio_resid > 0) {
 1819                 if ((bytesinfile = ip->i_size - uio->uio_offset) <= 0)
 1820                         break;
 1821                 lbn = lblkno(fs, uio->uio_offset);
 1822                 size = blksize(fs, ip, lbn);
 1823                 blkoffset = blkoff(fs, uio->uio_offset);
 1824 
 1825                 xfersize = fs->e2fs_fsize - blkoffset;
 1826                 xfersize = MIN(xfersize, uio->uio_resid);
 1827                 xfersize = MIN(xfersize, bytesinfile);
 1828 
 1829                 /* get block from ext4 extent cache */
 1830                 cache_type = ext4_ext_in_cache(ip, lbn, &nex);
 1831                 switch (cache_type) {
 1832                 case EXT4_EXT_CACHE_NO:
 1833                         ext4_ext_find_extent(fs, ip, lbn, &path);
 1834                         ep = path.ep_ext;
 1835                         if (ep == NULL)
 1836                                 return (EIO);
 1837 
 1838                         ext4_ext_put_cache(ip, ep, EXT4_EXT_CACHE_IN);
 1839 
 1840                         newblk = lbn - ep->e_blk + (ep->e_start_lo |
 1841                             (daddr_t)ep->e_start_hi << 32);
 1842 
 1843                         if (path.ep_bp != NULL) {
 1844                                 brelse(path.ep_bp);
 1845                                 path.ep_bp = NULL;
 1846                         }
 1847                         break;
 1848 
 1849                 case EXT4_EXT_CACHE_GAP:
 1850                         /* block has not been allocated yet */
 1851                         return (0);
 1852 
 1853                 case EXT4_EXT_CACHE_IN:
 1854                         newblk = lbn - nex.e_blk + (nex.e_start_lo |
 1855                             (daddr_t)nex.e_start_hi << 32);
 1856                         break;
 1857 
 1858                 default:
 1859                         panic("%s: invalid cache type", __func__);
 1860                 }
 1861 
 1862                 error = bread(ip->i_devvp, fsbtodb(fs, newblk), size, NOCRED, &bp);
 1863                 if (error) {
 1864                         brelse(bp);
 1865                         return (error);
 1866                 }
 1867 
 1868                 size -= bp->b_resid;
 1869                 if (size < xfersize) {
 1870                         if (size == 0) {
 1871                                 bqrelse(bp);
 1872                                 break;
 1873                         }
 1874                         xfersize = size;
 1875                 }
 1876                 error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio);
 1877                 bqrelse(bp);
 1878                 if (error)
 1879                         return (error);
 1880         }
 1881 
 1882         return (0);
 1883 }
 1884 
 1885 /*
 1886  * Vnode op for writing.
 1887  */
 1888 static int
 1889 ext2_write(struct vop_write_args *ap)
 1890 {
 1891         struct vnode *vp;
 1892         struct uio *uio;
 1893         struct inode *ip;
 1894         struct m_ext2fs *fs;
 1895         struct buf *bp;
 1896         daddr_t lbn;
 1897         off_t osize;
 1898         int blkoffset, error, flags, ioflag, resid, size, seqcount, xfersize;
 1899 
 1900         ioflag = ap->a_ioflag;
 1901         uio = ap->a_uio;
 1902         vp = ap->a_vp;
 1903 
 1904         seqcount = ioflag >> IO_SEQSHIFT;
 1905         ip = VTOI(vp);
 1906 
 1907 #ifdef INVARIANTS
 1908         if (uio->uio_rw != UIO_WRITE)
 1909                 panic("%s: mode", "ext2_write");
 1910 #endif
 1911 
 1912         switch (vp->v_type) {
 1913         case VREG:
 1914                 if (ioflag & IO_APPEND)
 1915                         uio->uio_offset = ip->i_size;
 1916                 if ((ip->i_flags & APPEND) && uio->uio_offset != ip->i_size)
 1917                         return (EPERM);
 1918                 /* FALLTHROUGH */
 1919         case VLNK:
 1920                 break;
 1921         case VDIR:
 1922                 /* XXX differs from ffs -- this is called from ext2_mkdir(). */
 1923                 if ((ioflag & IO_SYNC) == 0)
 1924                 panic("ext2_write: nonsync dir write");
 1925                 break;
 1926         default:
 1927                 panic("ext2_write: type %p %d (%jd,%jd)", (void *)vp,
 1928                     vp->v_type, (intmax_t)uio->uio_offset,
 1929                     (intmax_t)uio->uio_resid);
 1930         }
 1931 
 1932         KASSERT(uio->uio_resid >= 0, ("ext2_write: uio->uio_resid < 0"));
 1933         KASSERT(uio->uio_offset >= 0, ("ext2_write: uio->uio_offset < 0"));
 1934         fs = ip->i_e2fs;
 1935         if ((uoff_t)uio->uio_offset + uio->uio_resid > fs->e2fs_maxfilesize)
 1936                 return (EFBIG);
 1937         /*
 1938          * Maybe this should be above the vnode op call, but so long as
 1939          * file servers have no limits, I don't think it matters.
 1940          */
 1941         if (vn_rlimit_fsize(vp, uio, uio->uio_td))
 1942                 return (EFBIG);
 1943 
 1944         resid = uio->uio_resid;
 1945         osize = ip->i_size;
 1946         if (seqcount > BA_SEQMAX)
 1947                 flags = BA_SEQMAX << BA_SEQSHIFT;
 1948         else
 1949                 flags = seqcount << BA_SEQSHIFT;
 1950         if ((ioflag & IO_SYNC) && !DOINGASYNC(vp))
 1951                 flags |= IO_SYNC;
 1952 
 1953         for (error = 0; uio->uio_resid > 0;) {
 1954                 lbn = lblkno(fs, uio->uio_offset);
 1955                 blkoffset = blkoff(fs, uio->uio_offset);
 1956                 xfersize = fs->e2fs_fsize - blkoffset;
 1957                 if (uio->uio_resid < xfersize)
 1958                         xfersize = uio->uio_resid;
 1959                 if (uio->uio_offset + xfersize > ip->i_size)
 1960                         vnode_pager_setsize(vp, uio->uio_offset + xfersize);
 1961 
 1962                 /*
 1963                  * We must perform a read-before-write if the transfer size
 1964                  * does not cover the entire buffer.
 1965                  */
 1966                 if (fs->e2fs_bsize > xfersize)
 1967                         flags |= BA_CLRBUF;
 1968                 else
 1969                         flags &= ~BA_CLRBUF;
 1970                 error = ext2_balloc(ip, lbn, blkoffset + xfersize,
 1971                     ap->a_cred, &bp, flags);
 1972                 if (error != 0)
 1973                         break;
 1974 
 1975                 if ((ioflag & (IO_SYNC|IO_INVAL)) == (IO_SYNC|IO_INVAL))
 1976                         bp->b_flags |= B_NOCACHE;
 1977                 if (uio->uio_offset + xfersize > ip->i_size)
 1978                         ip->i_size = uio->uio_offset + xfersize;
 1979                 size = blksize(fs, ip, lbn) - bp->b_resid;
 1980                 if (size < xfersize)
 1981                         xfersize = size;
 1982 
 1983                 error =
 1984                     uiomove((char *)bp->b_data + blkoffset, (int)xfersize, uio);
 1985                 /*
 1986                  * If the buffer is not already filled and we encounter an
 1987                  * error while trying to fill it, we have to clear out any
 1988                  * garbage data from the pages instantiated for the buffer.
 1989                  * If we do not, a failed uiomove() during a write can leave
 1990                  * the prior contents of the pages exposed to a userland mmap.
 1991                  *
 1992                  * Note that we need only clear buffers with a transfer size
 1993                  * equal to the block size because buffers with a shorter
 1994                  * transfer size were cleared above by the call to ext2_balloc()
 1995                  * with the BA_CLRBUF flag set.
 1996                  *
 1997                  * If the source region for uiomove identically mmaps the
 1998                  * buffer, uiomove() performed the NOP copy, and the buffer
 1999                  * content remains valid because the page fault handler
 2000                  * validated the pages.
 2001                  */
 2002                 if (error != 0 && (bp->b_flags & B_CACHE) == 0 &&
 2003                     fs->e2fs_bsize == xfersize)
 2004                         vfs_bio_clrbuf(bp);
 2005                 if (ioflag & (IO_VMIO|IO_DIRECT)) {
 2006                         bp->b_flags |= B_RELBUF;
 2007                 }
 2008 
 2009                 /*
 2010                  * If IO_SYNC each buffer is written synchronously.  Otherwise
 2011                  * if we have a severe page deficiency write the buffer
 2012                  * asynchronously.  Otherwise try to cluster, and if that
 2013                  * doesn't do it then either do an async write (if O_DIRECT),
 2014                  * or a delayed write (if not).
 2015                  */
 2016                 if (ioflag & IO_SYNC) {
 2017                         (void)bwrite(bp);
 2018                 } else if (vm_page_count_severe() ||
 2019                     buf_dirty_count_severe() ||
 2020                     (ioflag & IO_ASYNC)) {
 2021                         bp->b_flags |= B_CLUSTEROK;
 2022                         bawrite(bp);
 2023                 } else if (xfersize + blkoffset == fs->e2fs_fsize) {
 2024                         if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERW) == 0) {
 2025                                 bp->b_flags |= B_CLUSTEROK;
 2026                                 cluster_write(vp, bp, ip->i_size, seqcount, 0);
 2027                         } else {
 2028                                 bawrite(bp);
 2029                         }
 2030                 } else if (ioflag & IO_DIRECT) {
 2031                         bp->b_flags |= B_CLUSTEROK;
 2032                         bawrite(bp);
 2033                 } else {
 2034                         bp->b_flags |= B_CLUSTEROK;
 2035                         bdwrite(bp);
 2036                 }
 2037                 if (error || xfersize == 0)
 2038                         break;
 2039         }
 2040         /*
 2041          * If we successfully wrote any data, and we are not the superuser
 2042          * we clear the setuid and setgid bits as a precaution against
 2043          * tampering.
 2044          */
 2045         if ((ip->i_mode & (ISUID | ISGID)) && resid > uio->uio_resid &&
 2046             ap->a_cred) {
 2047                 if (priv_check_cred(ap->a_cred, PRIV_VFS_RETAINSUGID, 0))
 2048                         ip->i_mode &= ~(ISUID | ISGID);
 2049         }
 2050         if (error) {
 2051                 if (ioflag & IO_UNIT) {
 2052                         (void)ext2_truncate(vp, osize,
 2053                             ioflag & IO_SYNC, ap->a_cred, uio->uio_td);
 2054                         uio->uio_offset -= resid - uio->uio_resid;
 2055                         uio->uio_resid = resid;
 2056                 }
 2057         }
 2058         if (uio->uio_resid != resid) {
 2059                 ip->i_flag |= IN_CHANGE | IN_UPDATE;
 2060                 if (ioflag & IO_SYNC)
 2061                         error = ext2_update(vp, 1);
 2062         }
 2063         return (error);
 2064 }
 2065 
 2066 /*
 2067  * get page routine
 2068  */
 2069 static int
 2070 ext2_getpages(struct vop_getpages_args *ap)
 2071 {
 2072         int i;
 2073         vm_page_t mreq;
 2074         int pcount;
 2075 
 2076         pcount = round_page(ap->a_count) / PAGE_SIZE;
 2077         mreq = ap->a_m[ap->a_reqpage];
 2078 
 2079         /*
 2080          * if ANY DEV_BSIZE blocks are valid on a large filesystem block,
 2081          * then the entire page is valid.  Since the page may be mapped,
 2082          * user programs might reference data beyond the actual end of file
 2083          * occuring within the page.  We have to zero that data.
 2084          */
 2085         VM_OBJECT_WLOCK(mreq->object);
 2086         if (mreq->valid) {
 2087                 if (mreq->valid != VM_PAGE_BITS_ALL)
 2088                         vm_page_zero_invalid(mreq, TRUE);
 2089                 for (i = 0; i < pcount; i++) {
 2090                         if (i != ap->a_reqpage) {
 2091                                 vm_page_lock(ap->a_m[i]);
 2092                                 vm_page_free(ap->a_m[i]);
 2093                                 vm_page_unlock(ap->a_m[i]);
 2094                         }
 2095                 }
 2096                 VM_OBJECT_WUNLOCK(mreq->object);
 2097                 return VM_PAGER_OK;
 2098         }
 2099         VM_OBJECT_WUNLOCK(mreq->object);
 2100 
 2101         return vnode_pager_generic_getpages(ap->a_vp, ap->a_m,
 2102                                             ap->a_count,
 2103                                             ap->a_reqpage);
 2104 }

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