1170808Sdelphij/* $NetBSD: tmpfs_vfsops.c,v 1.10 2005/12/11 12:24:29 christos Exp $ */ 2170808Sdelphij 3182739Sdelphij/*- 4170808Sdelphij * Copyright (c) 2005 The NetBSD Foundation, Inc. 5170808Sdelphij * All rights reserved. 6170808Sdelphij * 7170808Sdelphij * This code is derived from software contributed to The NetBSD Foundation 8170808Sdelphij * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9170808Sdelphij * 2005 program. 10170808Sdelphij * 11170808Sdelphij * Redistribution and use in source and binary forms, with or without 12170808Sdelphij * modification, are permitted provided that the following conditions 13170808Sdelphij * are met: 14170808Sdelphij * 1. Redistributions of source code must retain the above copyright 15170808Sdelphij * notice, this list of conditions and the following disclaimer. 16170808Sdelphij * 2. Redistributions in binary form must reproduce the above copyright 17170808Sdelphij * notice, this list of conditions and the following disclaimer in the 18170808Sdelphij * documentation and/or other materials provided with the distribution. 19170808Sdelphij * 20170808Sdelphij * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21170808Sdelphij * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22170808Sdelphij * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23170808Sdelphij * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24170808Sdelphij * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25170808Sdelphij * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26170808Sdelphij * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27170808Sdelphij * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28170808Sdelphij * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29170808Sdelphij * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30170808Sdelphij * POSSIBILITY OF SUCH DAMAGE. 31170808Sdelphij */ 32170808Sdelphij 33170808Sdelphij/* 34170808Sdelphij * Efficient memory file system. 35170808Sdelphij * 36170808Sdelphij * tmpfs is a file system that uses NetBSD's virtual memory sub-system 37170808Sdelphij * (the well-known UVM) to store file data and metadata in an efficient 38170808Sdelphij * way. This means that it does not follow the structure of an on-disk 39170808Sdelphij * file system because it simply does not need to. Instead, it uses 40170808Sdelphij * memory-specific data structures and algorithms to automatically 41170808Sdelphij * allocate and release resources. 42170808Sdelphij */ 43170808Sdelphij#include <sys/cdefs.h> 44170808Sdelphij__FBSDID("$FreeBSD$"); 45170808Sdelphij 46170808Sdelphij#include <sys/param.h> 47171308Sdelphij#include <sys/limits.h> 48170808Sdelphij#include <sys/lock.h> 49170808Sdelphij#include <sys/mutex.h> 50254741Sdelphij#include <sys/proc.h> 51254741Sdelphij#include <sys/jail.h> 52170808Sdelphij#include <sys/kernel.h> 53170808Sdelphij#include <sys/stat.h> 54170808Sdelphij#include <sys/systm.h> 55170808Sdelphij#include <sys/sysctl.h> 56170808Sdelphij 57170808Sdelphij#include <vm/vm.h> 58170808Sdelphij#include <vm/vm_object.h> 59170808Sdelphij#include <vm/vm_param.h> 60170808Sdelphij 61170808Sdelphij#include <fs/tmpfs/tmpfs.h> 62170808Sdelphij 63170808Sdelphij/* 64171070Sdelphij * Default permission for root node 65170808Sdelphij */ 66170808Sdelphij#define TMPFS_DEFAULT_ROOT_MODE (S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) 67170808Sdelphij 68170808SdelphijMALLOC_DEFINE(M_TMPFSMNT, "tmpfs mount", "tmpfs mount structures"); 69171087SdelphijMALLOC_DEFINE(M_TMPFSNAME, "tmpfs name", "tmpfs file names"); 70170808Sdelphij 71191990Sattiliostatic int tmpfs_mount(struct mount *); 72191990Sattiliostatic int tmpfs_unmount(struct mount *, int); 73191990Sattiliostatic int tmpfs_root(struct mount *, int flags, struct vnode **); 74222167Srmacklemstatic int tmpfs_fhtovp(struct mount *, struct fid *, int, 75222167Srmacklem struct vnode **); 76191990Sattiliostatic int tmpfs_statfs(struct mount *, struct statfs *); 77170808Sdelphij 78170808Sdelphijstatic const char *tmpfs_opts[] = { 79203164Sjh "from", "size", "maxfilesize", "inodes", "uid", "gid", "mode", "export", 80253573Snwhitehorn "union", NULL 81170808Sdelphij}; 82170808Sdelphij 83234346Sjhstatic const char *tmpfs_updateopts[] = { 84234346Sjh "from", "export", NULL 85234346Sjh}; 86234346Sjh 87171029Sdelphijstatic int 88171029Sdelphijtmpfs_node_ctor(void *mem, int size, void *arg, int flags) 89171029Sdelphij{ 90171029Sdelphij struct tmpfs_node *node = (struct tmpfs_node *)mem; 91171070Sdelphij 92171362Sdelphij node->tn_gen++; 93171029Sdelphij node->tn_size = 0; 94171029Sdelphij node->tn_status = 0; 95171029Sdelphij node->tn_flags = 0; 96171029Sdelphij node->tn_links = 0; 97171029Sdelphij node->tn_vnode = NULL; 98171029Sdelphij node->tn_vpstate = 0; 99170808Sdelphij 100171029Sdelphij return (0); 101171029Sdelphij} 102171029Sdelphij 103171029Sdelphijstatic void 104171029Sdelphijtmpfs_node_dtor(void *mem, int size, void *arg) 105171029Sdelphij{ 106171029Sdelphij struct tmpfs_node *node = (struct tmpfs_node *)mem; 107171029Sdelphij node->tn_type = VNON; 108171029Sdelphij} 109171029Sdelphij 110171070Sdelphijstatic int 111171029Sdelphijtmpfs_node_init(void *mem, int size, int flags) 112171029Sdelphij{ 113171029Sdelphij struct tmpfs_node *node = (struct tmpfs_node *)mem; 114171029Sdelphij node->tn_id = 0; 115171029Sdelphij 116171029Sdelphij mtx_init(&node->tn_interlock, "tmpfs node interlock", NULL, MTX_DEF); 117171362Sdelphij node->tn_gen = arc4random(); 118171070Sdelphij 119171029Sdelphij return (0); 120171029Sdelphij} 121171029Sdelphij 122171029Sdelphijstatic void 123171029Sdelphijtmpfs_node_fini(void *mem, int size) 124171029Sdelphij{ 125171029Sdelphij struct tmpfs_node *node = (struct tmpfs_node *)mem; 126171070Sdelphij 127171029Sdelphij mtx_destroy(&node->tn_interlock); 128171029Sdelphij} 129171029Sdelphij 130170808Sdelphijstatic int 131191990Sattiliotmpfs_mount(struct mount *mp) 132170808Sdelphij{ 133234000Sgleb const size_t nodes_per_page = howmany(PAGE_SIZE, 134234000Sgleb sizeof(struct tmpfs_dirent) + sizeof(struct tmpfs_node)); 135170808Sdelphij struct tmpfs_mount *tmp; 136170808Sdelphij struct tmpfs_node *root; 137254741Sdelphij struct thread *td = curthread; 138170808Sdelphij int error; 139171308Sdelphij /* Size counters. */ 140233999Sgleb u_quad_t pages; 141233999Sgleb off_t nodes_max, size_max, maxfilesize; 142170808Sdelphij 143171308Sdelphij /* Root node attributes. */ 144202187Sjh uid_t root_uid; 145202187Sjh gid_t root_gid; 146202187Sjh mode_t root_mode; 147171308Sdelphij 148202187Sjh struct vattr va; 149171308Sdelphij 150254741Sdelphij if (!prison_allow(td->td_ucred, PR_ALLOW_MOUNT_TMPFS)) 151254741Sdelphij return (EPERM); 152254741Sdelphij 153170808Sdelphij if (vfs_filteropt(mp->mnt_optnew, tmpfs_opts)) 154170808Sdelphij return (EINVAL); 155170808Sdelphij 156170808Sdelphij if (mp->mnt_flag & MNT_UPDATE) { 157234346Sjh /* Only support update mounts for certain options. */ 158234346Sjh if (vfs_filteropt(mp->mnt_optnew, tmpfs_updateopts) != 0) 159234346Sjh return (EOPNOTSUPP); 160234346Sjh if (vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0) != 161234346Sjh ((struct tmpfs_mount *)mp->mnt_data)->tm_ronly) 162234346Sjh return (EOPNOTSUPP); 163234346Sjh return (0); 164170808Sdelphij } 165170808Sdelphij 166175202Sattilio vn_lock(mp->mnt_vnodecovered, LK_SHARED | LK_RETRY); 167182371Sattilio error = VOP_GETATTR(mp->mnt_vnodecovered, &va, mp->mnt_cred); 168175294Sattilio VOP_UNLOCK(mp->mnt_vnodecovered, 0); 169171308Sdelphij if (error) 170171308Sdelphij return (error); 171170808Sdelphij 172171308Sdelphij if (mp->mnt_cred->cr_ruid != 0 || 173171308Sdelphij vfs_scanopt(mp->mnt_optnew, "gid", "%d", &root_gid) != 1) 174171308Sdelphij root_gid = va.va_gid; 175171308Sdelphij if (mp->mnt_cred->cr_ruid != 0 || 176171308Sdelphij vfs_scanopt(mp->mnt_optnew, "uid", "%d", &root_uid) != 1) 177171308Sdelphij root_uid = va.va_uid; 178171308Sdelphij if (mp->mnt_cred->cr_ruid != 0 || 179173570Sdelphij vfs_scanopt(mp->mnt_optnew, "mode", "%ho", &root_mode) != 1) 180171308Sdelphij root_mode = va.va_mode; 181233999Sgleb if (vfs_getopt_size(mp->mnt_optnew, "inodes", &nodes_max) != 0) 182171308Sdelphij nodes_max = 0; 183233999Sgleb if (vfs_getopt_size(mp->mnt_optnew, "size", &size_max) != 0) 184171308Sdelphij size_max = 0; 185233999Sgleb if (vfs_getopt_size(mp->mnt_optnew, "maxfilesize", &maxfilesize) != 0) 186203164Sjh maxfilesize = 0; 187170808Sdelphij 188170808Sdelphij /* Do not allow mounts if we do not have enough memory to preserve 189170808Sdelphij * the minimum reserved pages. */ 190233998Sgleb if (tmpfs_mem_avail() < TMPFS_PAGES_MINRESERVED) 191170808Sdelphij return ENOSPC; 192170808Sdelphij 193170808Sdelphij /* Get the maximum number of memory pages this file system is 194170808Sdelphij * allowed to use, based on the maximum size the user passed in 195170808Sdelphij * the mount structure. A value of zero is treated as if the 196170808Sdelphij * maximum available space was requested. */ 197263943Sbdrewery if (size_max == 0 || size_max > OFF_MAX - PAGE_SIZE || 198233999Sgleb (SIZE_MAX < OFF_MAX && size_max / PAGE_SIZE >= SIZE_MAX)) 199170808Sdelphij pages = SIZE_MAX; 200263943Sbdrewery else { 201263943Sbdrewery size_max = roundup(size_max, PAGE_SIZE); 202171308Sdelphij pages = howmany(size_max, PAGE_SIZE); 203263943Sbdrewery } 204170808Sdelphij MPASS(pages > 0); 205170808Sdelphij 206202708Sjh if (nodes_max <= 3) { 207234000Sgleb if (pages < INT_MAX / nodes_per_page) 208234000Sgleb nodes_max = pages * nodes_per_page; 209202708Sjh else 210234000Sgleb nodes_max = INT_MAX; 211233999Sgleb } 212234000Sgleb if (nodes_max > INT_MAX) 213234000Sgleb nodes_max = INT_MAX; 214233999Sgleb MPASS(nodes_max >= 3); 215170808Sdelphij 216170808Sdelphij /* Allocate the tmpfs mount structure and fill it. */ 217170808Sdelphij tmp = (struct tmpfs_mount *)malloc(sizeof(struct tmpfs_mount), 218170808Sdelphij M_TMPFSMNT, M_WAITOK | M_ZERO); 219171070Sdelphij 220170808Sdelphij mtx_init(&tmp->allnode_lock, "tmpfs allnode lock", NULL, MTX_DEF); 221233999Sgleb tmp->tm_nodes_max = nodes_max; 222170808Sdelphij tmp->tm_nodes_inuse = 0; 223233999Sgleb tmp->tm_maxfilesize = maxfilesize > 0 ? maxfilesize : OFF_MAX; 224170808Sdelphij LIST_INIT(&tmp->tm_nodes_used); 225171070Sdelphij 226170808Sdelphij tmp->tm_pages_max = pages; 227170808Sdelphij tmp->tm_pages_used = 0; 228171362Sdelphij tmp->tm_ino_unr = new_unrhdr(2, INT_MAX, &tmp->allnode_lock); 229173724Sdelphij tmp->tm_dirent_pool = uma_zcreate("TMPFS dirent", 230173724Sdelphij sizeof(struct tmpfs_dirent), 231173724Sdelphij NULL, NULL, NULL, NULL, 232173724Sdelphij UMA_ALIGN_PTR, 0); 233173724Sdelphij tmp->tm_node_pool = uma_zcreate("TMPFS node", 234173724Sdelphij sizeof(struct tmpfs_node), 235173724Sdelphij tmpfs_node_ctor, tmpfs_node_dtor, 236173724Sdelphij tmpfs_node_init, tmpfs_node_fini, 237173724Sdelphij UMA_ALIGN_PTR, 0); 238234346Sjh tmp->tm_ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 239170808Sdelphij 240170808Sdelphij /* Allocate the root node. */ 241269175Skib error = tmpfs_alloc_node(mp, tmp, VDIR, root_uid, 242171308Sdelphij root_gid, root_mode & ALLPERMS, NULL, NULL, 243191990Sattilio VNOVAL, &root); 244170808Sdelphij 245170808Sdelphij if (error != 0 || root == NULL) { 246171029Sdelphij uma_zdestroy(tmp->tm_node_pool); 247171029Sdelphij uma_zdestroy(tmp->tm_dirent_pool); 248171362Sdelphij delete_unrhdr(tmp->tm_ino_unr); 249170808Sdelphij free(tmp, M_TMPFSMNT); 250170808Sdelphij return error; 251170808Sdelphij } 252241011Smdf KASSERT(root->tn_id == 2, 253241011Smdf ("tmpfs root with invalid ino: %ju", (uintmax_t)root->tn_id)); 254170808Sdelphij tmp->tm_root = root; 255170808Sdelphij 256170808Sdelphij MNT_ILOCK(mp); 257170808Sdelphij mp->mnt_flag |= MNT_LOCAL; 258170808Sdelphij MNT_IUNLOCK(mp); 259171070Sdelphij 260170808Sdelphij mp->mnt_data = tmp; 261170808Sdelphij mp->mnt_stat.f_namemax = MAXNAMLEN; 262170808Sdelphij vfs_getnewfsid(mp); 263170808Sdelphij vfs_mountedfrom(mp, "tmpfs"); 264170808Sdelphij 265170808Sdelphij return 0; 266170808Sdelphij} 267170808Sdelphij 268170808Sdelphij/* ARGSUSED2 */ 269170808Sdelphijstatic int 270191990Sattiliotmpfs_unmount(struct mount *mp, int mntflags) 271170808Sdelphij{ 272170808Sdelphij struct tmpfs_mount *tmp; 273170808Sdelphij struct tmpfs_node *node; 274269175Skib int error, flags; 275170808Sdelphij 276269175Skib flags = (mntflags & MNT_FORCE) != 0 ? FORCECLOSE : 0; 277269175Skib tmp = VFS_TO_TMPFS(mp); 278170808Sdelphij 279269175Skib /* Stop writers */ 280269175Skib error = vfs_write_suspend_umnt(mp); 281170808Sdelphij if (error != 0) 282269175Skib return (error); 283269175Skib /* 284269175Skib * At this point, nodes cannot be destroyed by any other 285269175Skib * thread because write suspension is started. 286269175Skib */ 287170808Sdelphij 288269175Skib for (;;) { 289269175Skib error = vflush(mp, 0, flags, curthread); 290269175Skib if (error != 0) { 291269175Skib vfs_write_resume(mp, VR_START_WRITE); 292269175Skib return (error); 293269175Skib } 294269175Skib MNT_ILOCK(mp); 295269175Skib if (mp->mnt_nvnodelistsize == 0) { 296269175Skib MNT_IUNLOCK(mp); 297269175Skib break; 298269175Skib } 299269175Skib MNT_IUNLOCK(mp); 300269175Skib if ((mntflags & MNT_FORCE) == 0) { 301269175Skib vfs_write_resume(mp, VR_START_WRITE); 302269175Skib return (EBUSY); 303269175Skib } 304269175Skib } 305171070Sdelphij 306269175Skib TMPFS_LOCK(tmp); 307269175Skib while ((node = LIST_FIRST(&tmp->tm_nodes_used)) != NULL) { 308269175Skib TMPFS_UNLOCK(tmp); 309245115Sgleb if (node->tn_type == VDIR) 310245115Sgleb tmpfs_dir_destroy(tmp, node); 311170808Sdelphij tmpfs_free_node(tmp, node); 312269175Skib TMPFS_LOCK(tmp); 313170808Sdelphij } 314269175Skib TMPFS_UNLOCK(tmp); 315170808Sdelphij 316171029Sdelphij uma_zdestroy(tmp->tm_dirent_pool); 317171029Sdelphij uma_zdestroy(tmp->tm_node_pool); 318171362Sdelphij delete_unrhdr(tmp->tm_ino_unr); 319170808Sdelphij 320170808Sdelphij mtx_destroy(&tmp->allnode_lock); 321170808Sdelphij MPASS(tmp->tm_pages_used == 0); 322171308Sdelphij MPASS(tmp->tm_nodes_inuse == 0); 323170808Sdelphij 324170808Sdelphij /* Throw away the tmpfs_mount structure. */ 325170808Sdelphij free(mp->mnt_data, M_TMPFSMNT); 326170808Sdelphij mp->mnt_data = NULL; 327269175Skib vfs_write_resume(mp, VR_START_WRITE); 328171070Sdelphij 329170808Sdelphij MNT_ILOCK(mp); 330170808Sdelphij mp->mnt_flag &= ~MNT_LOCAL; 331170808Sdelphij MNT_IUNLOCK(mp); 332269175Skib 333269175Skib return (0); 334170808Sdelphij} 335170808Sdelphij 336170808Sdelphijstatic int 337191990Sattiliotmpfs_root(struct mount *mp, int flags, struct vnode **vpp) 338170808Sdelphij{ 339170808Sdelphij int error; 340191990Sattilio error = tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, flags, vpp); 341170808Sdelphij 342170808Sdelphij if (!error) 343171029Sdelphij (*vpp)->v_vflag |= VV_ROOT; 344170808Sdelphij 345170808Sdelphij return error; 346170808Sdelphij} 347170808Sdelphij 348170808Sdelphijstatic int 349222167Srmacklemtmpfs_fhtovp(struct mount *mp, struct fid *fhp, int flags, 350222167Srmacklem struct vnode **vpp) 351170808Sdelphij{ 352170808Sdelphij boolean_t found; 353170808Sdelphij struct tmpfs_fid *tfhp; 354170808Sdelphij struct tmpfs_mount *tmp; 355170808Sdelphij struct tmpfs_node *node; 356170808Sdelphij 357170808Sdelphij tmp = VFS_TO_TMPFS(mp); 358170808Sdelphij 359170808Sdelphij tfhp = (struct tmpfs_fid *)fhp; 360170808Sdelphij if (tfhp->tf_len != sizeof(struct tmpfs_fid)) 361170808Sdelphij return EINVAL; 362170808Sdelphij 363170808Sdelphij if (tfhp->tf_id >= tmp->tm_nodes_max) 364170808Sdelphij return EINVAL; 365170808Sdelphij 366170808Sdelphij found = FALSE; 367170808Sdelphij 368170808Sdelphij TMPFS_LOCK(tmp); 369170808Sdelphij LIST_FOREACH(node, &tmp->tm_nodes_used, tn_entries) { 370170808Sdelphij if (node->tn_id == tfhp->tf_id && 371170808Sdelphij node->tn_gen == tfhp->tf_gen) { 372170808Sdelphij found = TRUE; 373170808Sdelphij break; 374170808Sdelphij } 375170808Sdelphij } 376170808Sdelphij TMPFS_UNLOCK(tmp); 377170808Sdelphij 378171799Sdelphij if (found) 379191990Sattilio return (tmpfs_alloc_vp(mp, node, LK_EXCLUSIVE, vpp)); 380171799Sdelphij 381171799Sdelphij return (EINVAL); 382170808Sdelphij} 383170808Sdelphij 384170808Sdelphij/* ARGSUSED2 */ 385170808Sdelphijstatic int 386191990Sattiliotmpfs_statfs(struct mount *mp, struct statfs *sbp) 387170808Sdelphij{ 388170808Sdelphij struct tmpfs_mount *tmp; 389233998Sgleb size_t used; 390170808Sdelphij 391170808Sdelphij tmp = VFS_TO_TMPFS(mp); 392170808Sdelphij 393171070Sdelphij sbp->f_iosize = PAGE_SIZE; 394170808Sdelphij sbp->f_bsize = PAGE_SIZE; 395170808Sdelphij 396233998Sgleb used = tmpfs_pages_used(tmp); 397233998Sgleb if (tmp->tm_pages_max != SIZE_MAX) 398233998Sgleb sbp->f_blocks = tmp->tm_pages_max; 399233998Sgleb else 400233998Sgleb sbp->f_blocks = used + tmpfs_mem_avail(); 401233998Sgleb if (sbp->f_blocks <= used) 402233998Sgleb sbp->f_bavail = 0; 403233998Sgleb else 404233998Sgleb sbp->f_bavail = sbp->f_blocks - used; 405233998Sgleb sbp->f_bfree = sbp->f_bavail; 406233998Sgleb used = tmp->tm_nodes_inuse; 407233998Sgleb sbp->f_files = tmp->tm_nodes_max; 408233998Sgleb if (sbp->f_files <= used) 409233998Sgleb sbp->f_ffree = 0; 410233998Sgleb else 411233998Sgleb sbp->f_ffree = sbp->f_files - used; 412170808Sdelphij /* sbp->f_owner = tmp->tn_uid; */ 413170808Sdelphij 414170808Sdelphij return 0; 415170808Sdelphij} 416170808Sdelphij 417269175Skibstatic int 418269175Skibtmpfs_sync(struct mount *mp, int waitfor) 419269175Skib{ 420269175Skib 421269175Skib if (waitfor == MNT_SUSPEND) { 422269175Skib MNT_ILOCK(mp); 423269175Skib mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED; 424269175Skib MNT_IUNLOCK(mp); 425269175Skib } 426269175Skib return (0); 427269175Skib} 428269175Skib 429170808Sdelphij/* 430170808Sdelphij * tmpfs vfs operations. 431170808Sdelphij */ 432170808Sdelphij 433170808Sdelphijstruct vfsops tmpfs_vfsops = { 434170808Sdelphij .vfs_mount = tmpfs_mount, 435170808Sdelphij .vfs_unmount = tmpfs_unmount, 436170808Sdelphij .vfs_root = tmpfs_root, 437170808Sdelphij .vfs_statfs = tmpfs_statfs, 438170808Sdelphij .vfs_fhtovp = tmpfs_fhtovp, 439269175Skib .vfs_sync = tmpfs_sync, 440170808Sdelphij}; 441254741SdelphijVFS_SET(tmpfs_vfsops, tmpfs, VFCF_JAIL); 442