tmpfs_vfsops.c revision 234346
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: head/sys/fs/tmpfs/tmpfs_vfsops.c 234346 2012-04-16 18:07:42Z jh $"); 45170808Sdelphij 46170808Sdelphij#include <sys/param.h> 47171308Sdelphij#include <sys/limits.h> 48170808Sdelphij#include <sys/lock.h> 49170808Sdelphij#include <sys/mutex.h> 50170808Sdelphij#include <sys/kernel.h> 51170808Sdelphij#include <sys/stat.h> 52170808Sdelphij#include <sys/systm.h> 53170808Sdelphij#include <sys/sysctl.h> 54170808Sdelphij 55170808Sdelphij#include <vm/vm.h> 56170808Sdelphij#include <vm/vm_object.h> 57170808Sdelphij#include <vm/vm_param.h> 58170808Sdelphij 59170808Sdelphij#include <fs/tmpfs/tmpfs.h> 60170808Sdelphij 61170808Sdelphij/* 62171070Sdelphij * Default permission for root node 63170808Sdelphij */ 64170808Sdelphij#define TMPFS_DEFAULT_ROOT_MODE (S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) 65170808Sdelphij 66170808SdelphijMALLOC_DEFINE(M_TMPFSMNT, "tmpfs mount", "tmpfs mount structures"); 67171087SdelphijMALLOC_DEFINE(M_TMPFSNAME, "tmpfs name", "tmpfs file names"); 68170808Sdelphij 69170808Sdelphij/* --------------------------------------------------------------------- */ 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 78170808Sdelphij/* --------------------------------------------------------------------- */ 79170808Sdelphij 80170808Sdelphijstatic const char *tmpfs_opts[] = { 81203164Sjh "from", "size", "maxfilesize", "inodes", "uid", "gid", "mode", "export", 82170808Sdelphij NULL 83170808Sdelphij}; 84170808Sdelphij 85234346Sjhstatic const char *tmpfs_updateopts[] = { 86234346Sjh "from", "export", NULL 87234346Sjh}; 88234346Sjh 89170808Sdelphij/* --------------------------------------------------------------------- */ 90170808Sdelphij 91171029Sdelphijstatic int 92171029Sdelphijtmpfs_node_ctor(void *mem, int size, void *arg, int flags) 93171029Sdelphij{ 94171029Sdelphij struct tmpfs_node *node = (struct tmpfs_node *)mem; 95171070Sdelphij 96171362Sdelphij node->tn_gen++; 97171029Sdelphij node->tn_size = 0; 98171029Sdelphij node->tn_status = 0; 99171029Sdelphij node->tn_flags = 0; 100171029Sdelphij node->tn_links = 0; 101171029Sdelphij node->tn_vnode = NULL; 102171029Sdelphij node->tn_vpstate = 0; 103170808Sdelphij 104171029Sdelphij return (0); 105171029Sdelphij} 106171029Sdelphij 107171029Sdelphijstatic void 108171029Sdelphijtmpfs_node_dtor(void *mem, int size, void *arg) 109171029Sdelphij{ 110171029Sdelphij struct tmpfs_node *node = (struct tmpfs_node *)mem; 111171029Sdelphij node->tn_type = VNON; 112171029Sdelphij} 113171029Sdelphij 114171070Sdelphijstatic int 115171029Sdelphijtmpfs_node_init(void *mem, int size, int flags) 116171029Sdelphij{ 117171029Sdelphij struct tmpfs_node *node = (struct tmpfs_node *)mem; 118171029Sdelphij node->tn_id = 0; 119171029Sdelphij 120171029Sdelphij mtx_init(&node->tn_interlock, "tmpfs node interlock", NULL, MTX_DEF); 121171362Sdelphij node->tn_gen = arc4random(); 122171070Sdelphij 123171029Sdelphij return (0); 124171029Sdelphij} 125171029Sdelphij 126171029Sdelphijstatic void 127171029Sdelphijtmpfs_node_fini(void *mem, int size) 128171029Sdelphij{ 129171029Sdelphij struct tmpfs_node *node = (struct tmpfs_node *)mem; 130171070Sdelphij 131171029Sdelphij mtx_destroy(&node->tn_interlock); 132171029Sdelphij} 133171029Sdelphij 134170808Sdelphijstatic int 135191990Sattiliotmpfs_mount(struct mount *mp) 136170808Sdelphij{ 137234000Sgleb const size_t nodes_per_page = howmany(PAGE_SIZE, 138234000Sgleb sizeof(struct tmpfs_dirent) + sizeof(struct tmpfs_node)); 139170808Sdelphij struct tmpfs_mount *tmp; 140170808Sdelphij struct tmpfs_node *root; 141170808Sdelphij int error; 142171308Sdelphij /* Size counters. */ 143233999Sgleb u_quad_t pages; 144233999Sgleb off_t nodes_max, size_max, maxfilesize; 145170808Sdelphij 146171308Sdelphij /* Root node attributes. */ 147202187Sjh uid_t root_uid; 148202187Sjh gid_t root_gid; 149202187Sjh mode_t root_mode; 150171308Sdelphij 151202187Sjh struct vattr va; 152171308Sdelphij 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. */ 197233999Sgleb if (size_max < PAGE_SIZE || size_max > OFF_MAX - PAGE_SIZE || 198233999Sgleb (SIZE_MAX < OFF_MAX && size_max / PAGE_SIZE >= SIZE_MAX)) 199170808Sdelphij pages = SIZE_MAX; 200170808Sdelphij else 201171308Sdelphij pages = howmany(size_max, PAGE_SIZE); 202170808Sdelphij MPASS(pages > 0); 203170808Sdelphij 204202708Sjh if (nodes_max <= 3) { 205234000Sgleb if (pages < INT_MAX / nodes_per_page) 206234000Sgleb nodes_max = pages * nodes_per_page; 207202708Sjh else 208234000Sgleb nodes_max = INT_MAX; 209233999Sgleb } 210234000Sgleb if (nodes_max > INT_MAX) 211234000Sgleb nodes_max = INT_MAX; 212233999Sgleb MPASS(nodes_max >= 3); 213170808Sdelphij 214170808Sdelphij /* Allocate the tmpfs mount structure and fill it. */ 215170808Sdelphij tmp = (struct tmpfs_mount *)malloc(sizeof(struct tmpfs_mount), 216170808Sdelphij M_TMPFSMNT, M_WAITOK | M_ZERO); 217171070Sdelphij 218170808Sdelphij mtx_init(&tmp->allnode_lock, "tmpfs allnode lock", NULL, MTX_DEF); 219233999Sgleb tmp->tm_nodes_max = nodes_max; 220170808Sdelphij tmp->tm_nodes_inuse = 0; 221233999Sgleb tmp->tm_maxfilesize = maxfilesize > 0 ? maxfilesize : OFF_MAX; 222170808Sdelphij LIST_INIT(&tmp->tm_nodes_used); 223171070Sdelphij 224170808Sdelphij tmp->tm_pages_max = pages; 225170808Sdelphij tmp->tm_pages_used = 0; 226171362Sdelphij tmp->tm_ino_unr = new_unrhdr(2, INT_MAX, &tmp->allnode_lock); 227173724Sdelphij tmp->tm_dirent_pool = uma_zcreate("TMPFS dirent", 228173724Sdelphij sizeof(struct tmpfs_dirent), 229173724Sdelphij NULL, NULL, NULL, NULL, 230173724Sdelphij UMA_ALIGN_PTR, 0); 231173724Sdelphij tmp->tm_node_pool = uma_zcreate("TMPFS node", 232173724Sdelphij sizeof(struct tmpfs_node), 233173724Sdelphij tmpfs_node_ctor, tmpfs_node_dtor, 234173724Sdelphij tmpfs_node_init, tmpfs_node_fini, 235173724Sdelphij UMA_ALIGN_PTR, 0); 236234346Sjh tmp->tm_ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 237170808Sdelphij 238170808Sdelphij /* Allocate the root node. */ 239171308Sdelphij error = tmpfs_alloc_node(tmp, VDIR, root_uid, 240171308Sdelphij root_gid, root_mode & ALLPERMS, NULL, NULL, 241191990Sattilio VNOVAL, &root); 242170808Sdelphij 243170808Sdelphij if (error != 0 || root == NULL) { 244171029Sdelphij uma_zdestroy(tmp->tm_node_pool); 245171029Sdelphij uma_zdestroy(tmp->tm_dirent_pool); 246171362Sdelphij delete_unrhdr(tmp->tm_ino_unr); 247170808Sdelphij free(tmp, M_TMPFSMNT); 248170808Sdelphij return error; 249170808Sdelphij } 250171362Sdelphij KASSERT(root->tn_id == 2, ("tmpfs root with invalid ino: %d", root->tn_id)); 251170808Sdelphij tmp->tm_root = root; 252170808Sdelphij 253170808Sdelphij MNT_ILOCK(mp); 254170808Sdelphij mp->mnt_flag |= MNT_LOCAL; 255170808Sdelphij mp->mnt_kern_flag |= MNTK_MPSAFE; 256170808Sdelphij MNT_IUNLOCK(mp); 257171070Sdelphij 258170808Sdelphij mp->mnt_data = tmp; 259170808Sdelphij mp->mnt_stat.f_namemax = MAXNAMLEN; 260170808Sdelphij vfs_getnewfsid(mp); 261170808Sdelphij vfs_mountedfrom(mp, "tmpfs"); 262170808Sdelphij 263170808Sdelphij return 0; 264170808Sdelphij} 265170808Sdelphij 266170808Sdelphij/* --------------------------------------------------------------------- */ 267170808Sdelphij 268170808Sdelphij/* ARGSUSED2 */ 269170808Sdelphijstatic int 270191990Sattiliotmpfs_unmount(struct mount *mp, int mntflags) 271170808Sdelphij{ 272170808Sdelphij int error; 273170808Sdelphij int flags = 0; 274170808Sdelphij struct tmpfs_mount *tmp; 275170808Sdelphij struct tmpfs_node *node; 276170808Sdelphij 277170808Sdelphij /* Handle forced unmounts. */ 278170808Sdelphij if (mntflags & MNT_FORCE) 279170808Sdelphij flags |= FORCECLOSE; 280170808Sdelphij 281170808Sdelphij /* Finalize all pending I/O. */ 282191990Sattilio error = vflush(mp, 0, flags, curthread); 283170808Sdelphij if (error != 0) 284170808Sdelphij return error; 285170808Sdelphij 286170808Sdelphij tmp = VFS_TO_TMPFS(mp); 287171070Sdelphij 288170808Sdelphij /* Free all associated data. The loop iterates over the linked list 289170808Sdelphij * we have containing all used nodes. For each of them that is 290170808Sdelphij * a directory, we free all its directory entries. Note that after 291170808Sdelphij * freeing a node, it will automatically go to the available list, 292170808Sdelphij * so we will later have to iterate over it to release its items. */ 293170808Sdelphij node = LIST_FIRST(&tmp->tm_nodes_used); 294170808Sdelphij while (node != NULL) { 295170808Sdelphij struct tmpfs_node *next; 296170808Sdelphij 297170808Sdelphij if (node->tn_type == VDIR) { 298170808Sdelphij struct tmpfs_dirent *de; 299170808Sdelphij 300170808Sdelphij de = TAILQ_FIRST(&node->tn_dir.tn_dirhead); 301170808Sdelphij while (de != NULL) { 302170808Sdelphij struct tmpfs_dirent *nde; 303170808Sdelphij 304170808Sdelphij nde = TAILQ_NEXT(de, td_entries); 305170808Sdelphij tmpfs_free_dirent(tmp, de, FALSE); 306170808Sdelphij de = nde; 307170808Sdelphij node->tn_size -= sizeof(struct tmpfs_dirent); 308170808Sdelphij } 309170808Sdelphij } 310170808Sdelphij 311170808Sdelphij next = LIST_NEXT(node, tn_entries); 312170808Sdelphij tmpfs_free_node(tmp, node); 313170808Sdelphij node = next; 314170808Sdelphij } 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; 327171070Sdelphij 328170808Sdelphij MNT_ILOCK(mp); 329170808Sdelphij mp->mnt_flag &= ~MNT_LOCAL; 330170808Sdelphij MNT_IUNLOCK(mp); 331170808Sdelphij return 0; 332170808Sdelphij} 333170808Sdelphij 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 348170808Sdelphij/* --------------------------------------------------------------------- */ 349170808Sdelphij 350170808Sdelphijstatic int 351222167Srmacklemtmpfs_fhtovp(struct mount *mp, struct fid *fhp, int flags, 352222167Srmacklem struct vnode **vpp) 353170808Sdelphij{ 354170808Sdelphij boolean_t found; 355170808Sdelphij struct tmpfs_fid *tfhp; 356170808Sdelphij struct tmpfs_mount *tmp; 357170808Sdelphij struct tmpfs_node *node; 358170808Sdelphij 359170808Sdelphij tmp = VFS_TO_TMPFS(mp); 360170808Sdelphij 361170808Sdelphij tfhp = (struct tmpfs_fid *)fhp; 362170808Sdelphij if (tfhp->tf_len != sizeof(struct tmpfs_fid)) 363170808Sdelphij return EINVAL; 364170808Sdelphij 365170808Sdelphij if (tfhp->tf_id >= tmp->tm_nodes_max) 366170808Sdelphij return EINVAL; 367170808Sdelphij 368170808Sdelphij found = FALSE; 369170808Sdelphij 370170808Sdelphij TMPFS_LOCK(tmp); 371170808Sdelphij LIST_FOREACH(node, &tmp->tm_nodes_used, tn_entries) { 372170808Sdelphij if (node->tn_id == tfhp->tf_id && 373170808Sdelphij node->tn_gen == tfhp->tf_gen) { 374170808Sdelphij found = TRUE; 375170808Sdelphij break; 376170808Sdelphij } 377170808Sdelphij } 378170808Sdelphij TMPFS_UNLOCK(tmp); 379170808Sdelphij 380171799Sdelphij if (found) 381191990Sattilio return (tmpfs_alloc_vp(mp, node, LK_EXCLUSIVE, vpp)); 382171799Sdelphij 383171799Sdelphij return (EINVAL); 384170808Sdelphij} 385170808Sdelphij 386170808Sdelphij/* --------------------------------------------------------------------- */ 387170808Sdelphij 388170808Sdelphij/* ARGSUSED2 */ 389170808Sdelphijstatic int 390191990Sattiliotmpfs_statfs(struct mount *mp, struct statfs *sbp) 391170808Sdelphij{ 392170808Sdelphij struct tmpfs_mount *tmp; 393233998Sgleb size_t used; 394170808Sdelphij 395170808Sdelphij tmp = VFS_TO_TMPFS(mp); 396170808Sdelphij 397171070Sdelphij sbp->f_iosize = PAGE_SIZE; 398170808Sdelphij sbp->f_bsize = PAGE_SIZE; 399170808Sdelphij 400233998Sgleb used = tmpfs_pages_used(tmp); 401233998Sgleb if (tmp->tm_pages_max != SIZE_MAX) 402233998Sgleb sbp->f_blocks = tmp->tm_pages_max; 403233998Sgleb else 404233998Sgleb sbp->f_blocks = used + tmpfs_mem_avail(); 405233998Sgleb if (sbp->f_blocks <= used) 406233998Sgleb sbp->f_bavail = 0; 407233998Sgleb else 408233998Sgleb sbp->f_bavail = sbp->f_blocks - used; 409233998Sgleb sbp->f_bfree = sbp->f_bavail; 410233998Sgleb used = tmp->tm_nodes_inuse; 411233998Sgleb sbp->f_files = tmp->tm_nodes_max; 412233998Sgleb if (sbp->f_files <= used) 413233998Sgleb sbp->f_ffree = 0; 414233998Sgleb else 415233998Sgleb sbp->f_ffree = sbp->f_files - used; 416170808Sdelphij /* sbp->f_owner = tmp->tn_uid; */ 417170808Sdelphij 418170808Sdelphij return 0; 419170808Sdelphij} 420170808Sdelphij 421170808Sdelphij/* --------------------------------------------------------------------- */ 422170808Sdelphij 423170808Sdelphij/* 424170808Sdelphij * tmpfs vfs operations. 425170808Sdelphij */ 426170808Sdelphij 427170808Sdelphijstruct vfsops tmpfs_vfsops = { 428170808Sdelphij .vfs_mount = tmpfs_mount, 429170808Sdelphij .vfs_unmount = tmpfs_unmount, 430170808Sdelphij .vfs_root = tmpfs_root, 431170808Sdelphij .vfs_statfs = tmpfs_statfs, 432170808Sdelphij .vfs_fhtovp = tmpfs_fhtovp, 433170808Sdelphij}; 434170808SdelphijVFS_SET(tmpfs_vfsops, tmpfs, 0); 435