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

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    1 /*      $NetBSD: tmpfs_vnops.c,v 1.39 2007/07/23 15:41:01 jmmv Exp $    */
    2 
    3 /*-
    4  * SPDX-License-Identifier: BSD-2-Clause-NetBSD
    5  *
    6  * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc.
    7  * All rights reserved.
    8  *
    9  * This code is derived from software contributed to The NetBSD Foundation
   10  * by Julio M. Merino Vidal, developed as part of Google's Summer of Code
   11  * 2005 program.
   12  *
   13  * Redistribution and use in source and binary forms, with or without
   14  * modification, are permitted provided that the following conditions
   15  * are met:
   16  * 1. Redistributions of source code must retain the above copyright
   17  *    notice, this list of conditions and the following disclaimer.
   18  * 2. Redistributions in binary form must reproduce the above copyright
   19  *    notice, this list of conditions and the following disclaimer in the
   20  *    documentation and/or other materials provided with the distribution.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   24  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   25  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   26  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   32  * POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 /*
   36  * tmpfs vnode interface.
   37  */
   38 #include <sys/cdefs.h>
   39 __FBSDID("$FreeBSD$");
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/dirent.h>
   44 #include <sys/fcntl.h>
   45 #include <sys/file.h>
   46 #include <sys/limits.h>
   47 #include <sys/lockf.h>
   48 #include <sys/lock.h>
   49 #include <sys/mount.h>
   50 #include <sys/namei.h>
   51 #include <sys/priv.h>
   52 #include <sys/proc.h>
   53 #include <sys/rwlock.h>
   54 #include <sys/sched.h>
   55 #include <sys/stat.h>
   56 #include <sys/sysctl.h>
   57 #include <sys/unistd.h>
   58 #include <sys/vnode.h>
   59 #include <sys/smr.h>
   60 #include <security/audit/audit.h>
   61 #include <security/mac/mac_framework.h>
   62 
   63 #include <vm/vm.h>
   64 #include <vm/vm_param.h>
   65 #include <vm/vm_object.h>
   66 
   67 #include <fs/tmpfs/tmpfs_vnops.h>
   68 #include <fs/tmpfs/tmpfs.h>
   69 
   70 SYSCTL_DECL(_vfs_tmpfs);
   71 VFS_SMR_DECLARE;
   72 
   73 static volatile int tmpfs_rename_restarts;
   74 SYSCTL_INT(_vfs_tmpfs, OID_AUTO, rename_restarts, CTLFLAG_RD,
   75     __DEVOLATILE(int *, &tmpfs_rename_restarts), 0,
   76     "Times rename had to restart due to lock contention");
   77 
   78 static int
   79 tmpfs_vn_get_ino_alloc(struct mount *mp, void *arg, int lkflags,
   80     struct vnode **rvp)
   81 {
   82 
   83         return (tmpfs_alloc_vp(mp, arg, lkflags, rvp));
   84 }
   85 
   86 static int
   87 tmpfs_lookup1(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp)
   88 {
   89         struct tmpfs_dirent *de;
   90         struct tmpfs_node *dnode, *pnode;
   91         struct tmpfs_mount *tm;
   92         int error;
   93 
   94         /* Caller assumes responsibility for ensuring access (VEXEC). */
   95         dnode = VP_TO_TMPFS_DIR(dvp);
   96         *vpp = NULLVP;
   97 
   98         /* We cannot be requesting the parent directory of the root node. */
   99         MPASS(IMPLIES(dnode->tn_type == VDIR &&
  100             dnode->tn_dir.tn_parent == dnode,
  101             !(cnp->cn_flags & ISDOTDOT)));
  102 
  103         TMPFS_ASSERT_LOCKED(dnode);
  104         if (dnode->tn_dir.tn_parent == NULL) {
  105                 error = ENOENT;
  106                 goto out;
  107         }
  108         if (cnp->cn_flags & ISDOTDOT) {
  109                 tm = VFS_TO_TMPFS(dvp->v_mount);
  110                 pnode = dnode->tn_dir.tn_parent;
  111                 tmpfs_ref_node(pnode);
  112                 error = vn_vget_ino_gen(dvp, tmpfs_vn_get_ino_alloc,
  113                     pnode, cnp->cn_lkflags, vpp);
  114                 tmpfs_free_node(tm, pnode);
  115                 if (error != 0)
  116                         goto out;
  117         } else if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
  118                 VREF(dvp);
  119                 *vpp = dvp;
  120                 error = 0;
  121         } else {
  122                 de = tmpfs_dir_lookup(dnode, NULL, cnp);
  123                 if (de != NULL && de->td_node == NULL)
  124                         cnp->cn_flags |= ISWHITEOUT;
  125                 if (de == NULL || de->td_node == NULL) {
  126                         /*
  127                          * The entry was not found in the directory.
  128                          * This is OK if we are creating or renaming an
  129                          * entry and are working on the last component of
  130                          * the path name.
  131                          */
  132                         if ((cnp->cn_flags & ISLASTCN) &&
  133                             (cnp->cn_nameiop == CREATE || \
  134                             cnp->cn_nameiop == RENAME ||
  135                             (cnp->cn_nameiop == DELETE &&
  136                             cnp->cn_flags & DOWHITEOUT &&
  137                             cnp->cn_flags & ISWHITEOUT))) {
  138                                 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
  139                                     cnp->cn_thread);
  140                                 if (error != 0)
  141                                         goto out;
  142 
  143                                 /*
  144                                  * Keep the component name in the buffer for
  145                                  * future uses.
  146                                  */
  147                                 cnp->cn_flags |= SAVENAME;
  148 
  149                                 error = EJUSTRETURN;
  150                         } else
  151                                 error = ENOENT;
  152                 } else {
  153                         struct tmpfs_node *tnode;
  154 
  155                         /*
  156                          * The entry was found, so get its associated
  157                          * tmpfs_node.
  158                          */
  159                         tnode = de->td_node;
  160 
  161                         /*
  162                          * If we are not at the last path component and
  163                          * found a non-directory or non-link entry (which
  164                          * may itself be pointing to a directory), raise
  165                          * an error.
  166                          */
  167                         if ((tnode->tn_type != VDIR &&
  168                             tnode->tn_type != VLNK) &&
  169                             !(cnp->cn_flags & ISLASTCN)) {
  170                                 error = ENOTDIR;
  171                                 goto out;
  172                         }
  173 
  174                         /*
  175                          * If we are deleting or renaming the entry, keep
  176                          * track of its tmpfs_dirent so that it can be
  177                          * easily deleted later.
  178                          */
  179                         if ((cnp->cn_flags & ISLASTCN) &&
  180                             (cnp->cn_nameiop == DELETE ||
  181                             cnp->cn_nameiop == RENAME)) {
  182                                 error = VOP_ACCESS(dvp, VWRITE, cnp->cn_cred,
  183                                     cnp->cn_thread);
  184                                 if (error != 0)
  185                                         goto out;
  186 
  187                                 /* Allocate a new vnode on the matching entry. */
  188                                 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
  189                                     cnp->cn_lkflags, vpp);
  190                                 if (error != 0)
  191                                         goto out;
  192 
  193                                 if ((dnode->tn_mode & S_ISTXT) &&
  194                                   VOP_ACCESS(dvp, VADMIN, cnp->cn_cred,
  195                                   cnp->cn_thread) && VOP_ACCESS(*vpp, VADMIN,
  196                                   cnp->cn_cred, cnp->cn_thread)) {
  197                                         error = EPERM;
  198                                         vput(*vpp);
  199                                         *vpp = NULL;
  200                                         goto out;
  201                                 }
  202                                 cnp->cn_flags |= SAVENAME;
  203                         } else {
  204                                 error = tmpfs_alloc_vp(dvp->v_mount, tnode,
  205                                     cnp->cn_lkflags, vpp);
  206                                 if (error != 0)
  207                                         goto out;
  208                         }
  209                 }
  210         }
  211 
  212         /*
  213          * Store the result of this lookup in the cache.  Avoid this if the
  214          * request was for creation, as it does not improve timings on
  215          * emprical tests.
  216          */
  217         if ((cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp))
  218                 cache_enter(dvp, *vpp, cnp);
  219 
  220 out:
  221         /*
  222          * If there were no errors, *vpp cannot be null and it must be
  223          * locked.
  224          */
  225         MPASS(IFF(error == 0, *vpp != NULLVP && VOP_ISLOCKED(*vpp)));
  226 
  227         return (error);
  228 }
  229 
  230 static int
  231 tmpfs_cached_lookup(struct vop_cachedlookup_args *v)
  232 {
  233 
  234         return (tmpfs_lookup1(v->a_dvp, v->a_vpp, v->a_cnp));
  235 }
  236 
  237 static int
  238 tmpfs_lookup(struct vop_lookup_args *v)
  239 {
  240         struct vnode *dvp = v->a_dvp;
  241         struct vnode **vpp = v->a_vpp;
  242         struct componentname *cnp = v->a_cnp;
  243         int error;
  244 
  245         /* Check accessibility of requested node as a first step. */
  246         error = vn_dir_check_exec(dvp, cnp);
  247         if (error != 0)
  248                 return (error);
  249 
  250         return (tmpfs_lookup1(dvp, vpp, cnp));
  251 }
  252 
  253 static int
  254 tmpfs_create(struct vop_create_args *v)
  255 {
  256         struct vnode *dvp = v->a_dvp;
  257         struct vnode **vpp = v->a_vpp;
  258         struct componentname *cnp = v->a_cnp;
  259         struct vattr *vap = v->a_vap;
  260         int error;
  261 
  262         MPASS(vap->va_type == VREG || vap->va_type == VSOCK);
  263 
  264         error = tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
  265         if (error == 0 && (cnp->cn_flags & MAKEENTRY) != 0 && tmpfs_use_nc(dvp))
  266                 cache_enter(dvp, *vpp, cnp);
  267         return (error);
  268 }
  269 
  270 static int
  271 tmpfs_mknod(struct vop_mknod_args *v)
  272 {
  273         struct vnode *dvp = v->a_dvp;
  274         struct vnode **vpp = v->a_vpp;
  275         struct componentname *cnp = v->a_cnp;
  276         struct vattr *vap = v->a_vap;
  277 
  278         if (vap->va_type != VBLK && vap->va_type != VCHR &&
  279             vap->va_type != VFIFO)
  280                 return EINVAL;
  281 
  282         return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
  283 }
  284 
  285 struct fileops tmpfs_fnops;
  286 
  287 static int
  288 tmpfs_open(struct vop_open_args *v)
  289 {
  290         struct vnode *vp;
  291         struct tmpfs_node *node;
  292         struct file *fp;
  293         int error, mode;
  294 
  295         vp = v->a_vp;
  296         mode = v->a_mode;
  297         node = VP_TO_TMPFS_NODE(vp);
  298 
  299         /*
  300          * The file is still active but all its names have been removed
  301          * (e.g. by a "rmdir $(pwd)").  It cannot be opened any more as
  302          * it is about to die.
  303          */
  304         if (node->tn_links < 1)
  305                 return (ENOENT);
  306 
  307         /* If the file is marked append-only, deny write requests. */
  308         if (node->tn_flags & APPEND && (mode & (FWRITE | O_APPEND)) == FWRITE)
  309                 error = EPERM;
  310         else {
  311                 error = 0;
  312                 /* For regular files, the call below is nop. */
  313                 KASSERT(vp->v_type != VREG || (node->tn_reg.tn_aobj->flags &
  314                     OBJ_DEAD) == 0, ("dead object"));
  315                 vnode_create_vobject(vp, node->tn_size, v->a_td);
  316         }
  317 
  318         fp = v->a_fp;
  319         MPASS(fp == NULL || fp->f_data == NULL);
  320         if (error == 0 && fp != NULL && vp->v_type == VREG) {
  321                 tmpfs_ref_node(node);
  322                 finit_vnode(fp, mode, node, &tmpfs_fnops);
  323         }
  324 
  325         return (error);
  326 }
  327 
  328 static int
  329 tmpfs_close(struct vop_close_args *v)
  330 {
  331         struct vnode *vp = v->a_vp;
  332 
  333         /* Update node times. */
  334         tmpfs_update(vp);
  335 
  336         return (0);
  337 }
  338 
  339 int
  340 tmpfs_fo_close(struct file *fp, struct thread *td)
  341 {
  342         struct tmpfs_node *node;
  343 
  344         node = fp->f_data;
  345         if (node != NULL) {
  346                 MPASS(node->tn_type == VREG);
  347                 tmpfs_free_node(node->tn_reg.tn_tmp, node);
  348         }
  349         return (vnops.fo_close(fp, td));
  350 }
  351 
  352 /*
  353  * VOP_FPLOOKUP_VEXEC routines are subject to special circumstances, see
  354  * the comment above cache_fplookup for details.
  355  */
  356 int
  357 tmpfs_fplookup_vexec(struct vop_fplookup_vexec_args *v)
  358 {
  359         struct vnode *vp;
  360         struct tmpfs_node *node;
  361         struct ucred *cred;
  362         mode_t all_x, mode;
  363 
  364         vp = v->a_vp;
  365         node = VP_TO_TMPFS_NODE_SMR(vp);
  366         if (__predict_false(node == NULL))
  367                 return (EAGAIN);
  368 
  369         all_x = S_IXUSR | S_IXGRP | S_IXOTH;
  370         mode = atomic_load_short(&node->tn_mode);
  371         if (__predict_true((mode & all_x) == all_x))
  372                 return (0);
  373 
  374         cred = v->a_cred;
  375         return (vaccess_vexec_smr(mode, node->tn_uid, node->tn_gid, cred));
  376 }
  377 
  378 int
  379 tmpfs_access(struct vop_access_args *v)
  380 {
  381         struct vnode *vp = v->a_vp;
  382         accmode_t accmode = v->a_accmode;
  383         struct ucred *cred = v->a_cred;
  384         mode_t all_x = S_IXUSR | S_IXGRP | S_IXOTH;
  385         int error;
  386         struct tmpfs_node *node;
  387 
  388         MPASS(VOP_ISLOCKED(vp));
  389 
  390         node = VP_TO_TMPFS_NODE(vp);
  391 
  392         /*
  393          * Common case path lookup.
  394          */
  395         if (__predict_true(accmode == VEXEC && (node->tn_mode & all_x) == all_x))
  396                 return (0);
  397 
  398         switch (vp->v_type) {
  399         case VDIR:
  400                 /* FALLTHROUGH */
  401         case VLNK:
  402                 /* FALLTHROUGH */
  403         case VREG:
  404                 if (accmode & VWRITE && vp->v_mount->mnt_flag & MNT_RDONLY) {
  405                         error = EROFS;
  406                         goto out;
  407                 }
  408                 break;
  409 
  410         case VBLK:
  411                 /* FALLTHROUGH */
  412         case VCHR:
  413                 /* FALLTHROUGH */
  414         case VSOCK:
  415                 /* FALLTHROUGH */
  416         case VFIFO:
  417                 break;
  418 
  419         default:
  420                 error = EINVAL;
  421                 goto out;
  422         }
  423 
  424         if (accmode & VWRITE && node->tn_flags & IMMUTABLE) {
  425                 error = EPERM;
  426                 goto out;
  427         }
  428 
  429         error = vaccess(vp->v_type, node->tn_mode, node->tn_uid, node->tn_gid,
  430             accmode, cred);
  431 
  432 out:
  433         MPASS(VOP_ISLOCKED(vp));
  434 
  435         return (error);
  436 }
  437 
  438 int
  439 tmpfs_stat(struct vop_stat_args *v)
  440 {
  441         struct vnode *vp = v->a_vp;
  442         struct stat *sb = v->a_sb;
  443         vm_object_t obj;
  444         struct tmpfs_node *node;
  445         int error;
  446 
  447         node = VP_TO_TMPFS_NODE(vp);
  448 
  449         tmpfs_update_getattr(vp);
  450 
  451         error = vop_stat_helper_pre(v);
  452         if (__predict_false(error))
  453                 return (error);
  454 
  455         sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0];
  456         sb->st_ino = node->tn_id;
  457         sb->st_mode = node->tn_mode | VTTOIF(vp->v_type);
  458         sb->st_nlink = node->tn_links;
  459         sb->st_uid = node->tn_uid;
  460         sb->st_gid = node->tn_gid;
  461         sb->st_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
  462                 node->tn_rdev : NODEV;
  463         sb->st_size = node->tn_size;
  464         sb->st_atim.tv_sec = node->tn_atime.tv_sec;
  465         sb->st_atim.tv_nsec = node->tn_atime.tv_nsec;
  466         sb->st_mtim.tv_sec = node->tn_mtime.tv_sec;
  467         sb->st_mtim.tv_nsec = node->tn_mtime.tv_nsec;
  468         sb->st_ctim.tv_sec = node->tn_ctime.tv_sec;
  469         sb->st_ctim.tv_nsec = node->tn_ctime.tv_nsec;
  470         sb->st_birthtim.tv_sec = node->tn_birthtime.tv_sec;
  471         sb->st_birthtim.tv_nsec = node->tn_birthtime.tv_nsec;
  472         sb->st_blksize = PAGE_SIZE;
  473         sb->st_flags = node->tn_flags;
  474         sb->st_gen = node->tn_gen;
  475         if (vp->v_type == VREG) {
  476                 obj = node->tn_reg.tn_aobj;
  477                 sb->st_blocks = (u_quad_t)obj->resident_page_count * PAGE_SIZE;
  478         } else
  479                 sb->st_blocks = node->tn_size;
  480         sb->st_blocks /= S_BLKSIZE;
  481         return (vop_stat_helper_post(v, error));
  482 }
  483 
  484 int
  485 tmpfs_getattr(struct vop_getattr_args *v)
  486 {
  487         struct vnode *vp = v->a_vp;
  488         struct vattr *vap = v->a_vap;
  489         vm_object_t obj;
  490         struct tmpfs_node *node;
  491 
  492         node = VP_TO_TMPFS_NODE(vp);
  493 
  494         tmpfs_update_getattr(vp);
  495 
  496         vap->va_type = vp->v_type;
  497         vap->va_mode = node->tn_mode;
  498         vap->va_nlink = node->tn_links;
  499         vap->va_uid = node->tn_uid;
  500         vap->va_gid = node->tn_gid;
  501         vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
  502         vap->va_fileid = node->tn_id;
  503         vap->va_size = node->tn_size;
  504         vap->va_blocksize = PAGE_SIZE;
  505         vap->va_atime = node->tn_atime;
  506         vap->va_mtime = node->tn_mtime;
  507         vap->va_ctime = node->tn_ctime;
  508         vap->va_birthtime = node->tn_birthtime;
  509         vap->va_gen = node->tn_gen;
  510         vap->va_flags = node->tn_flags;
  511         vap->va_rdev = (vp->v_type == VBLK || vp->v_type == VCHR) ?
  512                 node->tn_rdev : NODEV;
  513         if (vp->v_type == VREG) {
  514                 obj = node->tn_reg.tn_aobj;
  515                 vap->va_bytes = (u_quad_t)obj->resident_page_count * PAGE_SIZE;
  516         } else
  517                 vap->va_bytes = node->tn_size;
  518         vap->va_filerev = 0;
  519 
  520         return 0;
  521 }
  522 
  523 int
  524 tmpfs_setattr(struct vop_setattr_args *v)
  525 {
  526         struct vnode *vp = v->a_vp;
  527         struct vattr *vap = v->a_vap;
  528         struct ucred *cred = v->a_cred;
  529         struct thread *td = curthread;
  530 
  531         int error;
  532 
  533         MPASS(VOP_ISLOCKED(vp));
  534         ASSERT_VOP_IN_SEQC(vp);
  535 
  536         error = 0;
  537 
  538         /* Abort if any unsettable attribute is given. */
  539         if (vap->va_type != VNON ||
  540             vap->va_nlink != VNOVAL ||
  541             vap->va_fsid != VNOVAL ||
  542             vap->va_fileid != VNOVAL ||
  543             vap->va_blocksize != VNOVAL ||
  544             vap->va_gen != VNOVAL ||
  545             vap->va_rdev != VNOVAL ||
  546             vap->va_bytes != VNOVAL)
  547                 error = EINVAL;
  548 
  549         if (error == 0 && (vap->va_flags != VNOVAL))
  550                 error = tmpfs_chflags(vp, vap->va_flags, cred, td);
  551 
  552         if (error == 0 && (vap->va_size != VNOVAL))
  553                 error = tmpfs_chsize(vp, vap->va_size, cred, td);
  554 
  555         if (error == 0 && (vap->va_uid != VNOVAL || vap->va_gid != VNOVAL))
  556                 error = tmpfs_chown(vp, vap->va_uid, vap->va_gid, cred, td);
  557 
  558         if (error == 0 && (vap->va_mode != (mode_t)VNOVAL))
  559                 error = tmpfs_chmod(vp, vap->va_mode, cred, td);
  560 
  561         if (error == 0 && ((vap->va_atime.tv_sec != VNOVAL &&
  562             vap->va_atime.tv_nsec != VNOVAL) ||
  563             (vap->va_mtime.tv_sec != VNOVAL &&
  564             vap->va_mtime.tv_nsec != VNOVAL) ||
  565             (vap->va_birthtime.tv_sec != VNOVAL &&
  566             vap->va_birthtime.tv_nsec != VNOVAL)))
  567                 error = tmpfs_chtimes(vp, vap, cred, td);
  568 
  569         /*
  570          * Update the node times.  We give preference to the error codes
  571          * generated by this function rather than the ones that may arise
  572          * from tmpfs_update.
  573          */
  574         tmpfs_update(vp);
  575 
  576         MPASS(VOP_ISLOCKED(vp));
  577 
  578         return error;
  579 }
  580 
  581 static int
  582 tmpfs_read(struct vop_read_args *v)
  583 {
  584         struct vnode *vp;
  585         struct uio *uio;
  586         struct tmpfs_node *node;
  587 
  588         vp = v->a_vp;
  589         if (vp->v_type != VREG)
  590                 return (EISDIR);
  591         uio = v->a_uio;
  592         if (uio->uio_offset < 0)
  593                 return (EINVAL);
  594         node = VP_TO_TMPFS_NODE(vp);
  595         tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node);
  596         return (uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio));
  597 }
  598 
  599 static int
  600 tmpfs_read_pgcache(struct vop_read_pgcache_args *v)
  601 {
  602         struct vnode *vp;
  603         struct tmpfs_node *node;
  604         vm_object_t object;
  605         off_t size;
  606         int error;
  607 
  608         vp = v->a_vp;
  609         VNPASS((vn_irflag_read(vp) & VIRF_PGREAD) != 0, vp);
  610 
  611         if (v->a_uio->uio_offset < 0)
  612                 return (EINVAL);
  613 
  614         error = EJUSTRETURN;
  615         vfs_smr_enter();
  616 
  617         node = VP_TO_TMPFS_NODE_SMR(vp);
  618         if (node == NULL)
  619                 goto out_smr;
  620         MPASS(node->tn_type == VREG);
  621         MPASS(node->tn_refcount >= 1);
  622         object = node->tn_reg.tn_aobj;
  623         if (object == NULL)
  624                 goto out_smr;
  625 
  626         MPASS((object->flags & (OBJ_ANON | OBJ_DEAD | OBJ_TMPFS_NODE)) ==
  627             OBJ_TMPFS_NODE);
  628         if (!VN_IS_DOOMED(vp)) {
  629                 /* size cannot become shorter due to rangelock. */
  630                 size = node->tn_size;
  631                 tmpfs_set_accessed(node->tn_reg.tn_tmp, node);
  632                 vfs_smr_exit();
  633                 error = uiomove_object(object, size, v->a_uio);
  634                 return (error);
  635         }
  636 out_smr:
  637         vfs_smr_exit();
  638         return (error);
  639 }
  640 
  641 static int
  642 tmpfs_write(struct vop_write_args *v)
  643 {
  644         struct vnode *vp;
  645         struct uio *uio;
  646         struct tmpfs_node *node;
  647         off_t oldsize;
  648         int error, ioflag;
  649         mode_t newmode;
  650 
  651         vp = v->a_vp;
  652         uio = v->a_uio;
  653         ioflag = v->a_ioflag;
  654         error = 0;
  655         node = VP_TO_TMPFS_NODE(vp);
  656         oldsize = node->tn_size;
  657 
  658         if (uio->uio_offset < 0 || vp->v_type != VREG)
  659                 return (EINVAL);
  660         if (uio->uio_resid == 0)
  661                 return (0);
  662         if (ioflag & IO_APPEND)
  663                 uio->uio_offset = node->tn_size;
  664         if (uio->uio_offset + uio->uio_resid >
  665           VFS_TO_TMPFS(vp->v_mount)->tm_maxfilesize)
  666                 return (EFBIG);
  667         if (vn_rlimit_fsize(vp, uio, uio->uio_td))
  668                 return (EFBIG);
  669         if (uio->uio_offset + uio->uio_resid > node->tn_size) {
  670                 error = tmpfs_reg_resize(vp, uio->uio_offset + uio->uio_resid,
  671                     FALSE);
  672                 if (error != 0)
  673                         goto out;
  674         }
  675 
  676         error = uiomove_object(node->tn_reg.tn_aobj, node->tn_size, uio);
  677         node->tn_status |= TMPFS_NODE_MODIFIED | TMPFS_NODE_CHANGED;
  678         node->tn_accessed = true;
  679         if (node->tn_mode & (S_ISUID | S_ISGID)) {
  680                 if (priv_check_cred(v->a_cred, PRIV_VFS_RETAINSUGID)) {
  681                         newmode = node->tn_mode & ~(S_ISUID | S_ISGID);
  682                         vn_seqc_write_begin(vp);
  683                         atomic_store_short(&node->tn_mode, newmode);
  684                         vn_seqc_write_end(vp);
  685                 }
  686         }
  687         if (error != 0)
  688                 (void)tmpfs_reg_resize(vp, oldsize, TRUE);
  689 
  690 out:
  691         MPASS(IMPLIES(error == 0, uio->uio_resid == 0));
  692         MPASS(IMPLIES(error != 0, oldsize == node->tn_size));
  693 
  694         return (error);
  695 }
  696 
  697 static int
  698 tmpfs_fsync(struct vop_fsync_args *v)
  699 {
  700         struct vnode *vp = v->a_vp;
  701 
  702         MPASS(VOP_ISLOCKED(vp));
  703 
  704         tmpfs_check_mtime(vp);
  705         tmpfs_update(vp);
  706 
  707         return 0;
  708 }
  709 
  710 static int
  711 tmpfs_remove(struct vop_remove_args *v)
  712 {
  713         struct vnode *dvp = v->a_dvp;
  714         struct vnode *vp = v->a_vp;
  715 
  716         int error;
  717         struct tmpfs_dirent *de;
  718         struct tmpfs_mount *tmp;
  719         struct tmpfs_node *dnode;
  720         struct tmpfs_node *node;
  721 
  722         MPASS(VOP_ISLOCKED(dvp));
  723         MPASS(VOP_ISLOCKED(vp));
  724 
  725         if (vp->v_type == VDIR) {
  726                 error = EISDIR;
  727                 goto out;
  728         }
  729 
  730         dnode = VP_TO_TMPFS_DIR(dvp);
  731         node = VP_TO_TMPFS_NODE(vp);
  732         tmp = VFS_TO_TMPFS(vp->v_mount);
  733         de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
  734         MPASS(de != NULL);
  735 
  736         /* Files marked as immutable or append-only cannot be deleted. */
  737         if ((node->tn_flags & (IMMUTABLE | APPEND | NOUNLINK)) ||
  738             (dnode->tn_flags & APPEND)) {
  739                 error = EPERM;
  740                 goto out;
  741         }
  742 
  743         /* Remove the entry from the directory; as it is a file, we do not
  744          * have to change the number of hard links of the directory. */
  745         tmpfs_dir_detach(dvp, de);
  746         if (v->a_cnp->cn_flags & DOWHITEOUT)
  747                 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
  748 
  749         /* Free the directory entry we just deleted.  Note that the node
  750          * referred by it will not be removed until the vnode is really
  751          * reclaimed. */
  752         tmpfs_free_dirent(tmp, de);
  753 
  754         node->tn_status |= TMPFS_NODE_CHANGED;
  755         node->tn_accessed = true;
  756         error = 0;
  757 
  758 out:
  759         return (error);
  760 }
  761 
  762 static int
  763 tmpfs_link(struct vop_link_args *v)
  764 {
  765         struct vnode *dvp = v->a_tdvp;
  766         struct vnode *vp = v->a_vp;
  767         struct componentname *cnp = v->a_cnp;
  768 
  769         int error;
  770         struct tmpfs_dirent *de;
  771         struct tmpfs_node *node;
  772 
  773         MPASS(VOP_ISLOCKED(dvp));
  774         MPASS(cnp->cn_flags & HASBUF);
  775         MPASS(dvp != vp); /* XXX When can this be false? */
  776         node = VP_TO_TMPFS_NODE(vp);
  777 
  778         /* Ensure that we do not overflow the maximum number of links imposed
  779          * by the system. */
  780         MPASS(node->tn_links <= TMPFS_LINK_MAX);
  781         if (node->tn_links == TMPFS_LINK_MAX) {
  782                 error = EMLINK;
  783                 goto out;
  784         }
  785 
  786         /* We cannot create links of files marked immutable or append-only. */
  787         if (node->tn_flags & (IMMUTABLE | APPEND)) {
  788                 error = EPERM;
  789                 goto out;
  790         }
  791 
  792         /* Allocate a new directory entry to represent the node. */
  793         error = tmpfs_alloc_dirent(VFS_TO_TMPFS(vp->v_mount), node,
  794             cnp->cn_nameptr, cnp->cn_namelen, &de);
  795         if (error != 0)
  796                 goto out;
  797 
  798         /* Insert the new directory entry into the appropriate directory. */
  799         if (cnp->cn_flags & ISWHITEOUT)
  800                 tmpfs_dir_whiteout_remove(dvp, cnp);
  801         tmpfs_dir_attach(dvp, de);
  802 
  803         /* vp link count has changed, so update node times. */
  804         node->tn_status |= TMPFS_NODE_CHANGED;
  805         tmpfs_update(vp);
  806 
  807         error = 0;
  808 
  809 out:
  810         return error;
  811 }
  812 
  813 /*
  814  * We acquire all but fdvp locks using non-blocking acquisitions.  If we
  815  * fail to acquire any lock in the path we will drop all held locks,
  816  * acquire the new lock in a blocking fashion, and then release it and
  817  * restart the rename.  This acquire/release step ensures that we do not
  818  * spin on a lock waiting for release.  On error release all vnode locks
  819  * and decrement references the way tmpfs_rename() would do.
  820  */
  821 static int
  822 tmpfs_rename_relock(struct vnode *fdvp, struct vnode **fvpp,
  823     struct vnode *tdvp, struct vnode **tvpp,
  824     struct componentname *fcnp, struct componentname *tcnp)
  825 {
  826         struct vnode *nvp;
  827         struct mount *mp;
  828         struct tmpfs_dirent *de;
  829         int error, restarts = 0;
  830 
  831         VOP_UNLOCK(tdvp);
  832         if (*tvpp != NULL && *tvpp != tdvp)
  833                 VOP_UNLOCK(*tvpp);
  834         mp = fdvp->v_mount;
  835 
  836 relock:
  837         restarts += 1;
  838         error = vn_lock(fdvp, LK_EXCLUSIVE);
  839         if (error)
  840                 goto releout;
  841         if (vn_lock(tdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
  842                 VOP_UNLOCK(fdvp);
  843                 error = vn_lock(tdvp, LK_EXCLUSIVE);
  844                 if (error)
  845                         goto releout;
  846                 VOP_UNLOCK(tdvp);
  847                 goto relock;
  848         }
  849         /*
  850          * Re-resolve fvp to be certain it still exists and fetch the
  851          * correct vnode.
  852          */
  853         de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(fdvp), NULL, fcnp);
  854         if (de == NULL) {
  855                 VOP_UNLOCK(fdvp);
  856                 VOP_UNLOCK(tdvp);
  857                 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
  858                     (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
  859                         error = EINVAL;
  860                 else
  861                         error = ENOENT;
  862                 goto releout;
  863         }
  864         error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE | LK_NOWAIT, &nvp);
  865         if (error != 0) {
  866                 VOP_UNLOCK(fdvp);
  867                 VOP_UNLOCK(tdvp);
  868                 if (error != EBUSY)
  869                         goto releout;
  870                 error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE, &nvp);
  871                 if (error != 0)
  872                         goto releout;
  873                 VOP_UNLOCK(nvp);
  874                 /*
  875                  * Concurrent rename race.
  876                  */
  877                 if (nvp == tdvp) {
  878                         vrele(nvp);
  879                         error = EINVAL;
  880                         goto releout;
  881                 }
  882                 vrele(*fvpp);
  883                 *fvpp = nvp;
  884                 goto relock;
  885         }
  886         vrele(*fvpp);
  887         *fvpp = nvp;
  888         VOP_UNLOCK(*fvpp);
  889         /*
  890          * Re-resolve tvp and acquire the vnode lock if present.
  891          */
  892         de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(tdvp), NULL, tcnp);
  893         /*
  894          * If tvp disappeared we just carry on.
  895          */
  896         if (de == NULL && *tvpp != NULL) {
  897                 vrele(*tvpp);
  898                 *tvpp = NULL;
  899         }
  900         /*
  901          * Get the tvp ino if the lookup succeeded.  We may have to restart
  902          * if the non-blocking acquire fails.
  903          */
  904         if (de != NULL) {
  905                 nvp = NULL;
  906                 error = tmpfs_alloc_vp(mp, de->td_node,
  907                     LK_EXCLUSIVE | LK_NOWAIT, &nvp);
  908                 if (*tvpp != NULL)
  909                         vrele(*tvpp);
  910                 *tvpp = nvp;
  911                 if (error != 0) {
  912                         VOP_UNLOCK(fdvp);
  913                         VOP_UNLOCK(tdvp);
  914                         if (error != EBUSY)
  915                                 goto releout;
  916                         error = tmpfs_alloc_vp(mp, de->td_node, LK_EXCLUSIVE,
  917                             &nvp);
  918                         if (error != 0)
  919                                 goto releout;
  920                         VOP_UNLOCK(nvp);
  921                         /*
  922                          * fdvp contains fvp, thus tvp (=fdvp) is not empty.
  923                          */
  924                         if (nvp == fdvp) {
  925                                 error = ENOTEMPTY;
  926                                 goto releout;
  927                         }
  928                         goto relock;
  929                 }
  930         }
  931         tmpfs_rename_restarts += restarts;
  932 
  933         return (0);
  934 
  935 releout:
  936         vrele(fdvp);
  937         vrele(*fvpp);
  938         vrele(tdvp);
  939         if (*tvpp != NULL)
  940                 vrele(*tvpp);
  941         tmpfs_rename_restarts += restarts;
  942 
  943         return (error);
  944 }
  945 
  946 static int
  947 tmpfs_rename(struct vop_rename_args *v)
  948 {
  949         struct vnode *fdvp = v->a_fdvp;
  950         struct vnode *fvp = v->a_fvp;
  951         struct componentname *fcnp = v->a_fcnp;
  952         struct vnode *tdvp = v->a_tdvp;
  953         struct vnode *tvp = v->a_tvp;
  954         struct componentname *tcnp = v->a_tcnp;
  955         char *newname;
  956         struct tmpfs_dirent *de;
  957         struct tmpfs_mount *tmp;
  958         struct tmpfs_node *fdnode;
  959         struct tmpfs_node *fnode;
  960         struct tmpfs_node *tnode;
  961         struct tmpfs_node *tdnode;
  962         int error;
  963         bool want_seqc_end;
  964 
  965         MPASS(VOP_ISLOCKED(tdvp));
  966         MPASS(IMPLIES(tvp != NULL, VOP_ISLOCKED(tvp)));
  967         MPASS(fcnp->cn_flags & HASBUF);
  968         MPASS(tcnp->cn_flags & HASBUF);
  969 
  970         want_seqc_end = false;
  971 
  972         /*
  973          * Disallow cross-device renames.
  974          * XXX Why isn't this done by the caller?
  975          */
  976         if (fvp->v_mount != tdvp->v_mount ||
  977             (tvp != NULL && fvp->v_mount != tvp->v_mount)) {
  978                 error = EXDEV;
  979                 goto out;
  980         }
  981 
  982         /* If source and target are the same file, there is nothing to do. */
  983         if (fvp == tvp) {
  984                 error = 0;
  985                 goto out;
  986         }
  987 
  988         /*
  989          * If we need to move the directory between entries, lock the
  990          * source so that we can safely operate on it.
  991          */
  992         if (fdvp != tdvp && fdvp != tvp) {
  993                 if (vn_lock(fdvp, LK_EXCLUSIVE | LK_NOWAIT) != 0) {
  994                         error = tmpfs_rename_relock(fdvp, &fvp, tdvp, &tvp,
  995                             fcnp, tcnp);
  996                         if (error != 0)
  997                                 return (error);
  998                         ASSERT_VOP_ELOCKED(fdvp,
  999                             "tmpfs_rename: fdvp not locked");
 1000                         ASSERT_VOP_ELOCKED(tdvp,
 1001                             "tmpfs_rename: tdvp not locked");
 1002                         if (tvp != NULL)
 1003                                 ASSERT_VOP_ELOCKED(tvp,
 1004                                     "tmpfs_rename: tvp not locked");
 1005                         if (fvp == tvp) {
 1006                                 error = 0;
 1007                                 goto out_locked;
 1008                         }
 1009                 }
 1010         }
 1011 
 1012         if (tvp != NULL)
 1013                 vn_seqc_write_begin(tvp);
 1014         vn_seqc_write_begin(tdvp);
 1015         vn_seqc_write_begin(fvp);
 1016         vn_seqc_write_begin(fdvp);
 1017         want_seqc_end = true;
 1018 
 1019         tmp = VFS_TO_TMPFS(tdvp->v_mount);
 1020         tdnode = VP_TO_TMPFS_DIR(tdvp);
 1021         tnode = (tvp == NULL) ? NULL : VP_TO_TMPFS_NODE(tvp);
 1022         fdnode = VP_TO_TMPFS_DIR(fdvp);
 1023         fnode = VP_TO_TMPFS_NODE(fvp);
 1024         de = tmpfs_dir_lookup(fdnode, fnode, fcnp);
 1025 
 1026         /*
 1027          * Entry can disappear before we lock fdvp,
 1028          * also avoid manipulating '.' and '..' entries.
 1029          */
 1030         if (de == NULL) {
 1031                 if ((fcnp->cn_flags & ISDOTDOT) != 0 ||
 1032                     (fcnp->cn_namelen == 1 && fcnp->cn_nameptr[0] == '.'))
 1033                         error = EINVAL;
 1034                 else
 1035                         error = ENOENT;
 1036                 goto out_locked;
 1037         }
 1038         MPASS(de->td_node == fnode);
 1039 
 1040         /*
 1041          * If re-naming a directory to another preexisting directory
 1042          * ensure that the target directory is empty so that its
 1043          * removal causes no side effects.
 1044          * Kern_rename guarantees the destination to be a directory
 1045          * if the source is one.
 1046          */
 1047         if (tvp != NULL) {
 1048                 MPASS(tnode != NULL);
 1049 
 1050                 if ((tnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) ||
 1051                     (tdnode->tn_flags & (APPEND | IMMUTABLE))) {
 1052                         error = EPERM;
 1053                         goto out_locked;
 1054                 }
 1055 
 1056                 if (fnode->tn_type == VDIR && tnode->tn_type == VDIR) {
 1057                         if (tnode->tn_size > 0) {
 1058                                 error = ENOTEMPTY;
 1059                                 goto out_locked;
 1060                         }
 1061                 } else if (fnode->tn_type == VDIR && tnode->tn_type != VDIR) {
 1062                         error = ENOTDIR;
 1063                         goto out_locked;
 1064                 } else if (fnode->tn_type != VDIR && tnode->tn_type == VDIR) {
 1065                         error = EISDIR;
 1066                         goto out_locked;
 1067                 } else {
 1068                         MPASS(fnode->tn_type != VDIR &&
 1069                                 tnode->tn_type != VDIR);
 1070                 }
 1071         }
 1072 
 1073         if ((fnode->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))
 1074             || (fdnode->tn_flags & (APPEND | IMMUTABLE))) {
 1075                 error = EPERM;
 1076                 goto out_locked;
 1077         }
 1078 
 1079         /*
 1080          * Ensure that we have enough memory to hold the new name, if it
 1081          * has to be changed.
 1082          */
 1083         if (fcnp->cn_namelen != tcnp->cn_namelen ||
 1084             bcmp(fcnp->cn_nameptr, tcnp->cn_nameptr, fcnp->cn_namelen) != 0) {
 1085                 newname = malloc(tcnp->cn_namelen, M_TMPFSNAME, M_WAITOK);
 1086         } else
 1087                 newname = NULL;
 1088 
 1089         /*
 1090          * If the node is being moved to another directory, we have to do
 1091          * the move.
 1092          */
 1093         if (fdnode != tdnode) {
 1094                 /*
 1095                  * In case we are moving a directory, we have to adjust its
 1096                  * parent to point to the new parent.
 1097                  */
 1098                 if (de->td_node->tn_type == VDIR) {
 1099                         struct tmpfs_node *n;
 1100 
 1101                         /*
 1102                          * Ensure the target directory is not a child of the
 1103                          * directory being moved.  Otherwise, we'd end up
 1104                          * with stale nodes.
 1105                          */
 1106                         n = tdnode;
 1107                         /*
 1108                          * TMPFS_LOCK guaranties that no nodes are freed while
 1109                          * traversing the list. Nodes can only be marked as
 1110                          * removed: tn_parent == NULL.
 1111                          */
 1112                         TMPFS_LOCK(tmp);
 1113                         TMPFS_NODE_LOCK(n);
 1114                         while (n != n->tn_dir.tn_parent) {
 1115                                 struct tmpfs_node *parent;
 1116 
 1117                                 if (n == fnode) {
 1118                                         TMPFS_NODE_UNLOCK(n);
 1119                                         TMPFS_UNLOCK(tmp);
 1120                                         error = EINVAL;
 1121                                         if (newname != NULL)
 1122                                                     free(newname, M_TMPFSNAME);
 1123                                         goto out_locked;
 1124                                 }
 1125                                 parent = n->tn_dir.tn_parent;
 1126                                 TMPFS_NODE_UNLOCK(n);
 1127                                 if (parent == NULL) {
 1128                                         n = NULL;
 1129                                         break;
 1130                                 }
 1131                                 TMPFS_NODE_LOCK(parent);
 1132                                 if (parent->tn_dir.tn_parent == NULL) {
 1133                                         TMPFS_NODE_UNLOCK(parent);
 1134                                         n = NULL;
 1135                                         break;
 1136                                 }
 1137                                 n = parent;
 1138                         }
 1139                         TMPFS_UNLOCK(tmp);
 1140                         if (n == NULL) {
 1141                                 error = EINVAL;
 1142                                 if (newname != NULL)
 1143                                             free(newname, M_TMPFSNAME);
 1144                                 goto out_locked;
 1145                         }
 1146                         TMPFS_NODE_UNLOCK(n);
 1147 
 1148                         /* Adjust the parent pointer. */
 1149                         TMPFS_VALIDATE_DIR(fnode);
 1150                         TMPFS_NODE_LOCK(de->td_node);
 1151                         de->td_node->tn_dir.tn_parent = tdnode;
 1152                         TMPFS_NODE_UNLOCK(de->td_node);
 1153 
 1154                         /*
 1155                          * As a result of changing the target of the '..'
 1156                          * entry, the link count of the source and target
 1157                          * directories has to be adjusted.
 1158                          */
 1159                         TMPFS_NODE_LOCK(tdnode);
 1160                         TMPFS_ASSERT_LOCKED(tdnode);
 1161                         tdnode->tn_links++;
 1162                         TMPFS_NODE_UNLOCK(tdnode);
 1163 
 1164                         TMPFS_NODE_LOCK(fdnode);
 1165                         TMPFS_ASSERT_LOCKED(fdnode);
 1166                         fdnode->tn_links--;
 1167                         TMPFS_NODE_UNLOCK(fdnode);
 1168                 }
 1169         }
 1170 
 1171         /*
 1172          * Do the move: just remove the entry from the source directory
 1173          * and insert it into the target one.
 1174          */
 1175         tmpfs_dir_detach(fdvp, de);
 1176 
 1177         if (fcnp->cn_flags & DOWHITEOUT)
 1178                 tmpfs_dir_whiteout_add(fdvp, fcnp);
 1179         if (tcnp->cn_flags & ISWHITEOUT)
 1180                 tmpfs_dir_whiteout_remove(tdvp, tcnp);
 1181 
 1182         /*
 1183          * If the name has changed, we need to make it effective by changing
 1184          * it in the directory entry.
 1185          */
 1186         if (newname != NULL) {
 1187                 MPASS(tcnp->cn_namelen <= MAXNAMLEN);
 1188 
 1189                 free(de->ud.td_name, M_TMPFSNAME);
 1190                 de->ud.td_name = newname;
 1191                 tmpfs_dirent_init(de, tcnp->cn_nameptr, tcnp->cn_namelen);
 1192 
 1193                 fnode->tn_status |= TMPFS_NODE_CHANGED;
 1194                 tdnode->tn_status |= TMPFS_NODE_MODIFIED;
 1195         }
 1196 
 1197         /*
 1198          * If we are overwriting an entry, we have to remove the old one
 1199          * from the target directory.
 1200          */
 1201         if (tvp != NULL) {
 1202                 struct tmpfs_dirent *tde;
 1203 
 1204                 /* Remove the old entry from the target directory. */
 1205                 tde = tmpfs_dir_lookup(tdnode, tnode, tcnp);
 1206                 tmpfs_dir_detach(tdvp, tde);
 1207 
 1208                 /*
 1209                  * Free the directory entry we just deleted.  Note that the
 1210                  * node referred by it will not be removed until the vnode is
 1211                  * really reclaimed.
 1212                  */
 1213                 tmpfs_free_dirent(VFS_TO_TMPFS(tvp->v_mount), tde);
 1214         }
 1215 
 1216         tmpfs_dir_attach(tdvp, de);
 1217 
 1218         if (tmpfs_use_nc(fvp)) {
 1219                 cache_vop_rename(fdvp, fvp, tdvp, tvp, fcnp, tcnp);
 1220         }
 1221 
 1222         error = 0;
 1223 
 1224 out_locked:
 1225         if (fdvp != tdvp && fdvp != tvp)
 1226                 VOP_UNLOCK(fdvp);
 1227 
 1228 out:
 1229         if (want_seqc_end) {
 1230                 if (tvp != NULL)
 1231                         vn_seqc_write_end(tvp);
 1232                 vn_seqc_write_end(tdvp);
 1233                 vn_seqc_write_end(fvp);
 1234                 vn_seqc_write_end(fdvp);
 1235         }
 1236 
 1237         /*
 1238          * Release target nodes.
 1239          * XXX: I don't understand when tdvp can be the same as tvp, but
 1240          * other code takes care of this...
 1241          */
 1242         if (tdvp == tvp)
 1243                 vrele(tdvp);
 1244         else
 1245                 vput(tdvp);
 1246         if (tvp != NULL)
 1247                 vput(tvp);
 1248 
 1249         /* Release source nodes. */
 1250         vrele(fdvp);
 1251         vrele(fvp);
 1252 
 1253         return (error);
 1254 }
 1255 
 1256 static int
 1257 tmpfs_mkdir(struct vop_mkdir_args *v)
 1258 {
 1259         struct vnode *dvp = v->a_dvp;
 1260         struct vnode **vpp = v->a_vpp;
 1261         struct componentname *cnp = v->a_cnp;
 1262         struct vattr *vap = v->a_vap;
 1263 
 1264         MPASS(vap->va_type == VDIR);
 1265 
 1266         return tmpfs_alloc_file(dvp, vpp, vap, cnp, NULL);
 1267 }
 1268 
 1269 static int
 1270 tmpfs_rmdir(struct vop_rmdir_args *v)
 1271 {
 1272         struct vnode *dvp = v->a_dvp;
 1273         struct vnode *vp = v->a_vp;
 1274 
 1275         int error;
 1276         struct tmpfs_dirent *de;
 1277         struct tmpfs_mount *tmp;
 1278         struct tmpfs_node *dnode;
 1279         struct tmpfs_node *node;
 1280 
 1281         MPASS(VOP_ISLOCKED(dvp));
 1282         MPASS(VOP_ISLOCKED(vp));
 1283 
 1284         tmp = VFS_TO_TMPFS(dvp->v_mount);
 1285         dnode = VP_TO_TMPFS_DIR(dvp);
 1286         node = VP_TO_TMPFS_DIR(vp);
 1287 
 1288         /* Directories with more than two entries ('.' and '..') cannot be
 1289          * removed. */
 1290          if (node->tn_size > 0) {
 1291                  error = ENOTEMPTY;
 1292                  goto out;
 1293          }
 1294 
 1295         if ((dnode->tn_flags & APPEND)
 1296             || (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND))) {
 1297                 error = EPERM;
 1298                 goto out;
 1299         }
 1300 
 1301         /* This invariant holds only if we are not trying to remove "..".
 1302           * We checked for that above so this is safe now. */
 1303         MPASS(node->tn_dir.tn_parent == dnode);
 1304 
 1305         /* Get the directory entry associated with node (vp).  This was
 1306          * filled by tmpfs_lookup while looking up the entry. */
 1307         de = tmpfs_dir_lookup(dnode, node, v->a_cnp);
 1308         MPASS(TMPFS_DIRENT_MATCHES(de,
 1309             v->a_cnp->cn_nameptr,
 1310             v->a_cnp->cn_namelen));
 1311 
 1312         /* Check flags to see if we are allowed to remove the directory. */
 1313         if ((dnode->tn_flags & APPEND) != 0 ||
 1314             (node->tn_flags & (NOUNLINK | IMMUTABLE | APPEND)) != 0) {
 1315                 error = EPERM;
 1316                 goto out;
 1317         }
 1318 
 1319         /* Detach the directory entry from the directory (dnode). */
 1320         tmpfs_dir_detach(dvp, de);
 1321         if (v->a_cnp->cn_flags & DOWHITEOUT)
 1322                 tmpfs_dir_whiteout_add(dvp, v->a_cnp);
 1323 
 1324         /* No vnode should be allocated for this entry from this point */
 1325         TMPFS_NODE_LOCK(node);
 1326         node->tn_links--;
 1327         node->tn_dir.tn_parent = NULL;
 1328         node->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
 1329         node->tn_accessed = true;
 1330 
 1331         TMPFS_NODE_UNLOCK(node);
 1332 
 1333         TMPFS_NODE_LOCK(dnode);
 1334         dnode->tn_links--;
 1335         dnode->tn_status |= TMPFS_NODE_CHANGED | TMPFS_NODE_MODIFIED;
 1336         dnode->tn_accessed = true;
 1337         TMPFS_NODE_UNLOCK(dnode);
 1338 
 1339         if (tmpfs_use_nc(dvp)) {
 1340                 cache_vop_rmdir(dvp, vp);
 1341         }
 1342 
 1343         /* Free the directory entry we just deleted.  Note that the node
 1344          * referred by it will not be removed until the vnode is really
 1345          * reclaimed. */
 1346         tmpfs_free_dirent(tmp, de);
 1347 
 1348         /* Release the deleted vnode (will destroy the node, notify
 1349          * interested parties and clean it from the cache). */
 1350 
 1351         dnode->tn_status |= TMPFS_NODE_CHANGED;
 1352         tmpfs_update(dvp);
 1353 
 1354         error = 0;
 1355 
 1356 out:
 1357         return error;
 1358 }
 1359 
 1360 static int
 1361 tmpfs_symlink(struct vop_symlink_args *v)
 1362 {
 1363         struct vnode *dvp = v->a_dvp;
 1364         struct vnode **vpp = v->a_vpp;
 1365         struct componentname *cnp = v->a_cnp;
 1366         struct vattr *vap = v->a_vap;
 1367         const char *target = v->a_target;
 1368 
 1369 #ifdef notyet /* XXX FreeBSD BUG: kern_symlink is not setting VLNK */
 1370         MPASS(vap->va_type == VLNK);
 1371 #else
 1372         vap->va_type = VLNK;
 1373 #endif
 1374 
 1375         return tmpfs_alloc_file(dvp, vpp, vap, cnp, target);
 1376 }
 1377 
 1378 static int
 1379 tmpfs_readdir(struct vop_readdir_args *va)
 1380 {
 1381         struct vnode *vp;
 1382         struct uio *uio;
 1383         struct tmpfs_mount *tm;
 1384         struct tmpfs_node *node;
 1385         u_long **cookies;
 1386         int *eofflag, *ncookies;
 1387         ssize_t startresid;
 1388         int error, maxcookies;
 1389 
 1390         vp = va->a_vp;
 1391         uio = va->a_uio;
 1392         eofflag = va->a_eofflag;
 1393         cookies = va->a_cookies;
 1394         ncookies = va->a_ncookies;
 1395 
 1396         /* This operation only makes sense on directory nodes. */
 1397         if (vp->v_type != VDIR)
 1398                 return ENOTDIR;
 1399 
 1400         maxcookies = 0;
 1401         node = VP_TO_TMPFS_DIR(vp);
 1402         tm = VFS_TO_TMPFS(vp->v_mount);
 1403 
 1404         startresid = uio->uio_resid;
 1405 
 1406         /* Allocate cookies for NFS and compat modules. */
 1407         if (cookies != NULL && ncookies != NULL) {
 1408                 maxcookies = howmany(node->tn_size,
 1409                     sizeof(struct tmpfs_dirent)) + 2;
 1410                 *cookies = malloc(maxcookies * sizeof(**cookies), M_TEMP,
 1411                     M_WAITOK);
 1412                 *ncookies = 0;
 1413         }
 1414 
 1415         if (cookies == NULL)
 1416                 error = tmpfs_dir_getdents(tm, node, uio, 0, NULL, NULL);
 1417         else
 1418                 error = tmpfs_dir_getdents(tm, node, uio, maxcookies, *cookies,
 1419                     ncookies);
 1420 
 1421         /* Buffer was filled without hitting EOF. */
 1422         if (error == EJUSTRETURN)
 1423                 error = (uio->uio_resid != startresid) ? 0 : EINVAL;
 1424 
 1425         if (error != 0 && cookies != NULL && ncookies != NULL) {
 1426                 free(*cookies, M_TEMP);
 1427                 *cookies = NULL;
 1428                 *ncookies = 0;
 1429         }
 1430 
 1431         if (eofflag != NULL)
 1432                 *eofflag =
 1433                     (error == 0 && uio->uio_offset == TMPFS_DIRCOOKIE_EOF);
 1434 
 1435         return error;
 1436 }
 1437 
 1438 static int
 1439 tmpfs_readlink(struct vop_readlink_args *v)
 1440 {
 1441         struct vnode *vp = v->a_vp;
 1442         struct uio *uio = v->a_uio;
 1443 
 1444         int error;
 1445         struct tmpfs_node *node;
 1446 
 1447         MPASS(uio->uio_offset == 0);
 1448         MPASS(vp->v_type == VLNK);
 1449 
 1450         node = VP_TO_TMPFS_NODE(vp);
 1451 
 1452         error = uiomove(node->tn_link_target, MIN(node->tn_size, uio->uio_resid),
 1453             uio);
 1454         tmpfs_set_accessed(VFS_TO_TMPFS(vp->v_mount), node);
 1455 
 1456         return (error);
 1457 }
 1458 
 1459 /*
 1460  * VOP_FPLOOKUP_SYMLINK routines are subject to special circumstances, see
 1461  * the comment above cache_fplookup for details.
 1462  *
 1463  * Check tmpfs_alloc_node for tmpfs-specific synchronisation notes.
 1464  */
 1465 static int
 1466 tmpfs_fplookup_symlink(struct vop_fplookup_symlink_args *v)
 1467 {
 1468         struct vnode *vp;
 1469         struct tmpfs_node *node;
 1470         char *symlink;
 1471 
 1472         vp = v->a_vp;
 1473         node = VP_TO_TMPFS_NODE_SMR(vp);
 1474         if (__predict_false(node == NULL))
 1475                 return (EAGAIN);
 1476         if (!atomic_load_char(&node->tn_link_smr))
 1477                 return (EAGAIN);
 1478         symlink = atomic_load_ptr(&node->tn_link_target);
 1479         if (symlink == NULL)
 1480                 return (EAGAIN);
 1481 
 1482         return (cache_symlink_resolve(v->a_fpl, symlink, node->tn_size));
 1483 }
 1484 
 1485 static int
 1486 tmpfs_inactive(struct vop_inactive_args *v)
 1487 {
 1488         struct vnode *vp;
 1489         struct tmpfs_node *node;
 1490 
 1491         vp = v->a_vp;
 1492         node = VP_TO_TMPFS_NODE(vp);
 1493         if (node->tn_links == 0)
 1494                 vrecycle(vp);
 1495         else
 1496                 tmpfs_check_mtime(vp);
 1497         return (0);
 1498 }
 1499 
 1500 static int
 1501 tmpfs_need_inactive(struct vop_need_inactive_args *ap)
 1502 {
 1503         struct vnode *vp;
 1504         struct tmpfs_node *node;
 1505         struct vm_object *obj;
 1506 
 1507         vp = ap->a_vp;
 1508         node = VP_TO_TMPFS_NODE(vp);
 1509         if (node->tn_links == 0)
 1510                 goto need;
 1511         if (vp->v_type == VREG) {
 1512                 obj = vp->v_object;
 1513                 if (obj->generation != obj->cleangeneration)
 1514                         goto need;
 1515         }
 1516         return (0);
 1517 need:
 1518         return (1);
 1519 }
 1520 
 1521 int
 1522 tmpfs_reclaim(struct vop_reclaim_args *v)
 1523 {
 1524         struct vnode *vp;
 1525         struct tmpfs_mount *tmp;
 1526         struct tmpfs_node *node;
 1527         bool unlock, tm_locked;
 1528 
 1529         vp = v->a_vp;
 1530         node = VP_TO_TMPFS_NODE(vp);
 1531         tmp = VFS_TO_TMPFS(vp->v_mount);
 1532         tm_locked = false;
 1533 
 1534         if (vp->v_type == VREG)
 1535                 tmpfs_destroy_vobject(vp, node->tn_reg.tn_aobj);
 1536         vp->v_object = NULL;
 1537 
 1538 relock:
 1539         TMPFS_NODE_LOCK(node);
 1540         if (!tm_locked && node->tn_links == 0 &&
 1541             (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
 1542                 TMPFS_NODE_UNLOCK(node);
 1543                 TMPFS_LOCK(tmp);
 1544                 tm_locked = true;
 1545                 goto relock;
 1546         }
 1547         tmpfs_free_vp(vp);
 1548 
 1549         /*
 1550          * If the node referenced by this vnode was deleted by the user,
 1551          * we must free its associated data structures (now that the vnode
 1552          * is being reclaimed).
 1553          */
 1554         if (node->tn_links == 0 &&
 1555             (node->tn_vpstate & TMPFS_VNODE_ALLOCATING) == 0) {
 1556                 MPASS(tm_locked);
 1557                 node->tn_vpstate = TMPFS_VNODE_DOOMED;
 1558                 unlock = !tmpfs_free_node_locked(tmp, node, true);
 1559         } else {
 1560                 unlock = true;
 1561         }
 1562 
 1563         if (unlock) {
 1564                 TMPFS_NODE_UNLOCK(node);
 1565                 if (tm_locked)
 1566                         TMPFS_UNLOCK(tmp);
 1567         }
 1568 
 1569         MPASS(vp->v_data == NULL);
 1570         return (0);
 1571 }
 1572 
 1573 int
 1574 tmpfs_print(struct vop_print_args *v)
 1575 {
 1576         struct vnode *vp = v->a_vp;
 1577 
 1578         struct tmpfs_node *node;
 1579 
 1580         node = VP_TO_TMPFS_NODE(vp);
 1581 
 1582         printf("tag VT_TMPFS, tmpfs_node %p, flags 0x%lx, links %jd\n",
 1583             node, node->tn_flags, (uintmax_t)node->tn_links);
 1584         printf("\tmode 0%o, owner %d, group %d, size %jd, status 0x%x\n",
 1585             node->tn_mode, node->tn_uid, node->tn_gid,
 1586             (intmax_t)node->tn_size, node->tn_status);
 1587 
 1588         if (vp->v_type == VFIFO)
 1589                 fifo_printinfo(vp);
 1590 
 1591         printf("\n");
 1592 
 1593         return 0;
 1594 }
 1595 
 1596 int
 1597 tmpfs_pathconf(struct vop_pathconf_args *v)
 1598 {
 1599         struct vnode *vp = v->a_vp;
 1600         int name = v->a_name;
 1601         long *retval = v->a_retval;
 1602 
 1603         int error;
 1604 
 1605         error = 0;
 1606 
 1607         switch (name) {
 1608         case _PC_LINK_MAX:
 1609                 *retval = TMPFS_LINK_MAX;
 1610                 break;
 1611 
 1612         case _PC_NAME_MAX:
 1613                 *retval = NAME_MAX;
 1614                 break;
 1615 
 1616         case _PC_PIPE_BUF:
 1617                 if (vp->v_type == VDIR || vp->v_type == VFIFO)
 1618                         *retval = PIPE_BUF;
 1619                 else
 1620                         error = EINVAL;
 1621                 break;
 1622 
 1623         case _PC_CHOWN_RESTRICTED:
 1624                 *retval = 1;
 1625                 break;
 1626 
 1627         case _PC_NO_TRUNC:
 1628                 *retval = 1;
 1629                 break;
 1630 
 1631         case _PC_SYNC_IO:
 1632                 *retval = 1;
 1633                 break;
 1634 
 1635         case _PC_FILESIZEBITS:
 1636                 *retval = 64;
 1637                 break;
 1638 
 1639         default:
 1640                 error = vop_stdpathconf(v);
 1641         }
 1642 
 1643         return error;
 1644 }
 1645 
 1646 static int
 1647 tmpfs_vptofh(struct vop_vptofh_args *ap)
 1648 /*
 1649 vop_vptofh {
 1650         IN struct vnode *a_vp;
 1651         IN struct fid *a_fhp;
 1652 };
 1653 */
 1654 {
 1655         struct tmpfs_fid_data tfd;
 1656         struct tmpfs_node *node;
 1657         struct fid *fhp;
 1658 
 1659         node = VP_TO_TMPFS_NODE(ap->a_vp);
 1660         fhp = ap->a_fhp;
 1661         fhp->fid_len = sizeof(tfd);
 1662 
 1663         /*
 1664          * Copy into fid_data from the stack to avoid unaligned pointer use.
 1665          * See the comment in sys/mount.h on struct fid for details.
 1666          */
 1667         tfd.tfd_id = node->tn_id;
 1668         tfd.tfd_gen = node->tn_gen;
 1669         memcpy(fhp->fid_data, &tfd, fhp->fid_len);
 1670 
 1671         return (0);
 1672 }
 1673 
 1674 static int
 1675 tmpfs_whiteout(struct vop_whiteout_args *ap)
 1676 {
 1677         struct vnode *dvp = ap->a_dvp;
 1678         struct componentname *cnp = ap->a_cnp;
 1679         struct tmpfs_dirent *de;
 1680 
 1681         switch (ap->a_flags) {
 1682         case LOOKUP:
 1683                 return (0);
 1684         case CREATE:
 1685                 de = tmpfs_dir_lookup(VP_TO_TMPFS_DIR(dvp), NULL, cnp);
 1686                 if (de != NULL)
 1687                         return (de->td_node == NULL ? 0 : EEXIST);
 1688                 return (tmpfs_dir_whiteout_add(dvp, cnp));
 1689         case DELETE:
 1690                 tmpfs_dir_whiteout_remove(dvp, cnp);
 1691                 return (0);
 1692         default:
 1693                 panic("tmpfs_whiteout: unknown op");
 1694         }
 1695 }
 1696 
 1697 static int
 1698 tmpfs_vptocnp_dir(struct tmpfs_node *tn, struct tmpfs_node *tnp,
 1699     struct tmpfs_dirent **pde)
 1700 {
 1701         struct tmpfs_dir_cursor dc;
 1702         struct tmpfs_dirent *de;
 1703 
 1704         for (de = tmpfs_dir_first(tnp, &dc); de != NULL;
 1705              de = tmpfs_dir_next(tnp, &dc)) {
 1706                 if (de->td_node == tn) {
 1707                         *pde = de;
 1708                         return (0);
 1709                 }
 1710         }
 1711         return (ENOENT);
 1712 }
 1713 
 1714 static int
 1715 tmpfs_vptocnp_fill(struct vnode *vp, struct tmpfs_node *tn,
 1716     struct tmpfs_node *tnp, char *buf, size_t *buflen, struct vnode **dvp)
 1717 {
 1718         struct tmpfs_dirent *de;
 1719         int error, i;
 1720 
 1721         error = vn_vget_ino_gen(vp, tmpfs_vn_get_ino_alloc, tnp, LK_SHARED,
 1722             dvp);
 1723         if (error != 0)
 1724                 return (error);
 1725         error = tmpfs_vptocnp_dir(tn, tnp, &de);
 1726         if (error == 0) {
 1727                 i = *buflen;
 1728                 i -= de->td_namelen;
 1729                 if (i < 0) {
 1730                         error = ENOMEM;
 1731                 } else {
 1732                         bcopy(de->ud.td_name, buf + i, de->td_namelen);
 1733                         *buflen = i;
 1734                 }
 1735         }
 1736         if (error == 0) {
 1737                 if (vp != *dvp)
 1738                         VOP_UNLOCK(*dvp);
 1739         } else {
 1740                 if (vp != *dvp)
 1741                         vput(*dvp);
 1742                 else
 1743                         vrele(vp);
 1744         }
 1745         return (error);
 1746 }
 1747 
 1748 static int
 1749 tmpfs_vptocnp(struct vop_vptocnp_args *ap)
 1750 {
 1751         struct vnode *vp, **dvp;
 1752         struct tmpfs_node *tn, *tnp, *tnp1;
 1753         struct tmpfs_dirent *de;
 1754         struct tmpfs_mount *tm;
 1755         char *buf;
 1756         size_t *buflen;
 1757         int error;
 1758 
 1759         vp = ap->a_vp;
 1760         dvp = ap->a_vpp;
 1761         buf = ap->a_buf;
 1762         buflen = ap->a_buflen;
 1763 
 1764         tm = VFS_TO_TMPFS(vp->v_mount);
 1765         tn = VP_TO_TMPFS_NODE(vp);
 1766         if (tn->tn_type == VDIR) {
 1767                 tnp = tn->tn_dir.tn_parent;
 1768                 if (tnp == NULL)
 1769                         return (ENOENT);
 1770                 tmpfs_ref_node(tnp);
 1771                 error = tmpfs_vptocnp_fill(vp, tn, tn->tn_dir.tn_parent, buf,
 1772                     buflen, dvp);
 1773                 tmpfs_free_node(tm, tnp);
 1774                 return (error);
 1775         }
 1776 restart:
 1777         TMPFS_LOCK(tm);
 1778 restart_locked:
 1779         LIST_FOREACH_SAFE(tnp, &tm->tm_nodes_used, tn_entries, tnp1) {
 1780                 if (tnp->tn_type != VDIR)
 1781                         continue;
 1782                 TMPFS_NODE_LOCK(tnp);
 1783                 tmpfs_ref_node(tnp);
 1784 
 1785                 /*
 1786                  * tn_vnode cannot be instantiated while we hold the
 1787                  * node lock, so the directory cannot be changed while
 1788                  * we iterate over it.  Do this to avoid instantiating
 1789                  * vnode for directories which cannot point to our
 1790                  * node.
 1791                  */
 1792                 error = tnp->tn_vnode == NULL ? tmpfs_vptocnp_dir(tn, tnp,
 1793                     &de) : 0;
 1794 
 1795                 if (error == 0) {
 1796                         TMPFS_NODE_UNLOCK(tnp);
 1797                         TMPFS_UNLOCK(tm);
 1798                         error = tmpfs_vptocnp_fill(vp, tn, tnp, buf, buflen,
 1799                             dvp);
 1800                         if (error == 0) {
 1801                                 tmpfs_free_node(tm, tnp);
 1802                                 return (0);
 1803                         }
 1804                         if (VN_IS_DOOMED(vp)) {
 1805                                 tmpfs_free_node(tm, tnp);
 1806                                 return (ENOENT);
 1807                         }
 1808                         TMPFS_LOCK(tm);
 1809                         TMPFS_NODE_LOCK(tnp);
 1810                 }
 1811                 if (tmpfs_free_node_locked(tm, tnp, false)) {
 1812                         goto restart;
 1813                 } else {
 1814                         KASSERT(tnp->tn_refcount > 0,
 1815                             ("node %p refcount zero", tnp));
 1816                         if (tnp->tn_attached) {
 1817                                 tnp1 = LIST_NEXT(tnp, tn_entries);
 1818                                 TMPFS_NODE_UNLOCK(tnp);
 1819                         } else {
 1820                                 TMPFS_NODE_UNLOCK(tnp);
 1821                                 goto restart_locked;
 1822                         }
 1823                 }
 1824         }
 1825         TMPFS_UNLOCK(tm);
 1826         return (ENOENT);
 1827 }
 1828 
 1829 /*
 1830  * Vnode operations vector used for files stored in a tmpfs file system.
 1831  */
 1832 struct vop_vector tmpfs_vnodeop_entries = {
 1833         .vop_default =                  &default_vnodeops,
 1834         .vop_lookup =                   vfs_cache_lookup,
 1835         .vop_cachedlookup =             tmpfs_cached_lookup,
 1836         .vop_create =                   tmpfs_create,
 1837         .vop_mknod =                    tmpfs_mknod,
 1838         .vop_open =                     tmpfs_open,
 1839         .vop_close =                    tmpfs_close,
 1840         .vop_fplookup_vexec =           tmpfs_fplookup_vexec,
 1841         .vop_fplookup_symlink =         tmpfs_fplookup_symlink,
 1842         .vop_access =                   tmpfs_access,
 1843         .vop_stat =                     tmpfs_stat,
 1844         .vop_getattr =                  tmpfs_getattr,
 1845         .vop_setattr =                  tmpfs_setattr,
 1846         .vop_read =                     tmpfs_read,
 1847         .vop_read_pgcache =             tmpfs_read_pgcache,
 1848         .vop_write =                    tmpfs_write,
 1849         .vop_fsync =                    tmpfs_fsync,
 1850         .vop_remove =                   tmpfs_remove,
 1851         .vop_link =                     tmpfs_link,
 1852         .vop_rename =                   tmpfs_rename,
 1853         .vop_mkdir =                    tmpfs_mkdir,
 1854         .vop_rmdir =                    tmpfs_rmdir,
 1855         .vop_symlink =                  tmpfs_symlink,
 1856         .vop_readdir =                  tmpfs_readdir,
 1857         .vop_readlink =                 tmpfs_readlink,
 1858         .vop_inactive =                 tmpfs_inactive,
 1859         .vop_need_inactive =            tmpfs_need_inactive,
 1860         .vop_reclaim =                  tmpfs_reclaim,
 1861         .vop_print =                    tmpfs_print,
 1862         .vop_pathconf =                 tmpfs_pathconf,
 1863         .vop_vptofh =                   tmpfs_vptofh,
 1864         .vop_whiteout =                 tmpfs_whiteout,
 1865         .vop_bmap =                     VOP_EOPNOTSUPP,
 1866         .vop_vptocnp =                  tmpfs_vptocnp,
 1867         .vop_lock1 =                    vop_lock,
 1868         .vop_unlock =                   vop_unlock,
 1869         .vop_islocked =                 vop_islocked,
 1870 };
 1871 VFS_VOP_VECTOR_REGISTER(tmpfs_vnodeop_entries);
 1872 
 1873 /*
 1874  * Same vector for mounts which do not use namecache.
 1875  */
 1876 struct vop_vector tmpfs_vnodeop_nonc_entries = {
 1877         .vop_default =                  &tmpfs_vnodeop_entries,
 1878         .vop_lookup =                   tmpfs_lookup,
 1879 };
 1880 VFS_VOP_VECTOR_REGISTER(tmpfs_vnodeop_nonc_entries);

Cache object: ebe4a462c7d882379beccd93856dacf0


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