1258945Sroberto/* $NetBSD: tmpfs.h,v 1.26 2007/02/22 06:37:00 thorpej Exp $ */ 2258945Sroberto 3258945Sroberto/*- 4258945Sroberto * Copyright (c) 2005, 2006 The NetBSD Foundation, Inc. 5258945Sroberto * All rights reserved. 6258945Sroberto * 7258945Sroberto * This code is derived from software contributed to The NetBSD Foundation 8258945Sroberto * by Julio M. Merino Vidal, developed as part of Google's Summer of Code 9258945Sroberto * 2005 program. 10280849Scy * 11280849Scy * Redistribution and use in source and binary forms, with or without 12258945Sroberto * modification, are permitted provided that the following conditions 13258945Sroberto * are met: 14258945Sroberto * 1. Redistributions of source code must retain the above copyright 15258945Sroberto * notice, this list of conditions and the following disclaimer. 16258945Sroberto * 2. Redistributions in binary form must reproduce the above copyright 17258945Sroberto * notice, this list of conditions and the following disclaimer in the 18258945Sroberto * documentation and/or other materials provided with the distribution. 19258945Sroberto * 20258945Sroberto * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21258945Sroberto * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22280849Scy * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23280849Scy * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24280849Scy * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25280849Scy * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26258945Sroberto * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27258945Sroberto * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28258945Sroberto * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29258945Sroberto * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30258945Sroberto * POSSIBILITY OF SUCH DAMAGE. 31258945Sroberto * 32258945Sroberto * $FreeBSD$ 33258945Sroberto */ 34258945Sroberto 35258945Sroberto#ifndef _FS_TMPFS_TMPFS_H_ 36258945Sroberto#define _FS_TMPFS_TMPFS_H_ 37258945Sroberto 38290000Sglebius/* --------------------------------------------------------------------- 39258945Sroberto * KERNEL-SPECIFIC DEFINITIONS 40258945Sroberto * --------------------------------------------------------------------- */ 41258945Sroberto#include <sys/dirent.h> 42258945Sroberto#include <sys/mount.h> 43258945Sroberto#include <sys/queue.h> 44258945Sroberto#include <sys/vnode.h> 45258945Sroberto#include <sys/file.h> 46258945Sroberto#include <sys/lock.h> 47258945Sroberto#include <sys/mutex.h> 48258945Sroberto 49258945Sroberto/* --------------------------------------------------------------------- */ 50258945Sroberto#include <sys/malloc.h> 51258945Sroberto#include <sys/systm.h> 52258945Sroberto#include <sys/tree.h> 53280849Scy#include <sys/vmmeter.h> 54280849Scy#include <vm/swap_pager.h> 55258945Sroberto 56258945SrobertoMALLOC_DECLARE(M_TMPFSMNT); 57258945SrobertoMALLOC_DECLARE(M_TMPFSNAME); 58258945Sroberto 59258945Sroberto/* --------------------------------------------------------------------- */ 60280849Scy 61258945Sroberto/* 62258945Sroberto * Internal representation of a tmpfs directory entry. 63258945Sroberto */ 64280849Scy 65258945SrobertoLIST_HEAD(tmpfs_dir_duphead, tmpfs_dirent); 66258945Sroberto 67258945Srobertostruct tmpfs_dirent { 68258945Sroberto /* 69258945Sroberto * Depending on td_cookie flag entry can be of 3 types: 70258945Sroberto * - regular -- no hash collisions, stored in RB-Tree 71258945Sroberto * - duphead -- synthetic linked list head for dup entries 72258945Sroberto * - dup -- stored in linked list instead of RB-Tree 73258945Sroberto */ 74258945Sroberto union { 75258945Sroberto /* regular and duphead entry types */ 76258945Sroberto RB_ENTRY(tmpfs_dirent) td_entries; 77258945Sroberto 78258945Sroberto /* dup entry type */ 79258945Sroberto struct { 80258945Sroberto LIST_ENTRY(tmpfs_dirent) entries; 81258945Sroberto LIST_ENTRY(tmpfs_dirent) index_entries; 82258945Sroberto } td_dup; 83258945Sroberto } uh; 84258945Sroberto 85258945Sroberto uint32_t td_cookie; 86258945Sroberto uint32_t td_hash; 87258945Sroberto u_int td_namelen; 88258945Sroberto 89258945Sroberto /* Pointer to the node this entry refers to. In case this field 90258945Sroberto * is NULL, the node is a whiteout. */ 91280849Scy struct tmpfs_node * td_node; 92280849Scy 93258945Sroberto union { 94258945Sroberto /* 95280849Scy * The name of the entry, allocated from a string pool. This 96258945Sroberto * string is not required to be zero-terminated. 97258945Sroberto */ 98258945Sroberto char * td_name; /* regular, dup */ 99258945Sroberto struct tmpfs_dir_duphead td_duphead; /* duphead */ 100258945Sroberto } ud; 101258945Sroberto}; 102258945Sroberto 103258945Sroberto/* A directory in tmpfs holds a list of directory entries, which in 104258945Sroberto * turn point to other files (which can be directories themselves). 105258945Sroberto * 106258945Sroberto * In tmpfs, this list is managed by a RB-Tree, whose head is defined by 107258945Sroberto * the struct tmpfs_dir type. 108258945Sroberto * 109258945Sroberto * It is important to notice that directories do not have entries for . and 110258945Sroberto * .. as other file systems do. These can be generated when requested 111258945Sroberto * based on information available by other means, such as the pointer to 112258945Sroberto * the node itself in the former case or the pointer to the parent directory 113258945Sroberto * in the latter case. This is done to simplify tmpfs's code and, more 114258945Sroberto * importantly, to remove redundancy. */ 115280849ScyRB_HEAD(tmpfs_dir, tmpfs_dirent); 116280849Scy 117280849Scy/* Each entry in a directory has a cookie that identifies it. Cookies 118280849Scy * supersede offsets within directories because, given how tmpfs stores 119280849Scy * directories in memory, there is no such thing as an offset. 120280849Scy * 121280849Scy * The '.', '..' and the end of directory markers have fixed cookies which 122280849Scy * cannot collide with the cookies generated by other entries. The cookies 123280849Scy * for the other entries are generated based on the file name hash value or 124280849Scy * unique number in case of name hash collision. 125280849Scy * 126258945Sroberto * To preserve compatibility cookies are limited to 31 bits. 127258945Sroberto */ 128258945Sroberto 129258945Sroberto#define TMPFS_DIRCOOKIE_DOT 0 130258945Sroberto#define TMPFS_DIRCOOKIE_DOTDOT 1 131258945Sroberto#define TMPFS_DIRCOOKIE_EOF 2 132258945Sroberto#define TMPFS_DIRCOOKIE_MASK ((off_t)0x3fffffffU) 133258945Sroberto#define TMPFS_DIRCOOKIE_MIN ((off_t)0x00000004U) 134258945Sroberto#define TMPFS_DIRCOOKIE_DUP ((off_t)0x40000000U) 135258945Sroberto#define TMPFS_DIRCOOKIE_DUPHEAD ((off_t)0x80000000U) 136258945Sroberto#define TMPFS_DIRCOOKIE_DUP_MIN TMPFS_DIRCOOKIE_DUP 137258945Sroberto#define TMPFS_DIRCOOKIE_DUP_MAX \ 138258945Sroberto (TMPFS_DIRCOOKIE_DUP | TMPFS_DIRCOOKIE_MASK) 139258945Sroberto 140258945Sroberto/* --------------------------------------------------------------------- */ 141258945Sroberto 142258945Sroberto/* 143258945Sroberto * Internal representation of a tmpfs file system node. 144258945Sroberto * 145258945Sroberto * This structure is splitted in two parts: one holds attributes common 146280849Scy * to all file types and the other holds data that is only applicable to 147280849Scy * a particular type. The code must be careful to only access those 148280849Scy * attributes that are actually allowed by the node's type. 149280849Scy * 150280849Scy * 151280849Scy * Below is the key of locks used to protected the fields in the following 152258945Sroberto * structures. 153258945Sroberto * 154258945Sroberto */ 155258945Srobertostruct tmpfs_node { 156258945Sroberto /* Doubly-linked list entry which links all existing nodes for a 157258945Sroberto * single file system. This is provided to ease the removal of 158258945Sroberto * all nodes during the unmount operation. */ 159280849Scy LIST_ENTRY(tmpfs_node) tn_entries; 160258945Sroberto 161258945Sroberto /* The node's type. Any of 'VBLK', 'VCHR', 'VDIR', 'VFIFO', 162280849Scy * 'VLNK', 'VREG' and 'VSOCK' is allowed. The usage of vnode 163258945Sroberto * types instead of a custom enumeration is to make things simpler 164258945Sroberto * and faster, as we do not need to convert between two types. */ 165258945Sroberto enum vtype tn_type; 166258945Sroberto 167258945Sroberto /* Node identifier. */ 168258945Sroberto ino_t tn_id; 169258945Sroberto 170258945Sroberto /* Node's internal status. This is used by several file system 171258945Sroberto * operations to do modifications to the node in a delayed 172258945Sroberto * fashion. */ 173280849Scy int tn_status; 174280849Scy#define TMPFS_NODE_ACCESSED (1 << 1) 175258945Sroberto#define TMPFS_NODE_MODIFIED (1 << 2) 176258945Sroberto#define TMPFS_NODE_CHANGED (1 << 3) 177258945Sroberto 178258945Sroberto /* The node size. It does not necessarily match the real amount 179258945Sroberto * of memory consumed by it. */ 180280849Scy off_t tn_size; 181280849Scy 182258945Sroberto /* Generic node attributes. */ 183258945Sroberto uid_t tn_uid; 184258945Sroberto gid_t tn_gid; 185258945Sroberto mode_t tn_mode; 186258945Sroberto u_long tn_flags; 187258945Sroberto nlink_t tn_links; 188258945Sroberto struct timespec tn_atime; 189258945Sroberto struct timespec tn_mtime; 190258945Sroberto struct timespec tn_ctime; 191258945Sroberto struct timespec tn_birthtime; 192258945Sroberto unsigned long tn_gen; 193258945Sroberto 194258945Sroberto /* As there is a single vnode for each active file within the 195280849Scy * system, care has to be taken to avoid allocating more than one 196258945Sroberto * vnode per file. In order to do this, a bidirectional association 197258945Sroberto * is kept between vnodes and nodes. 198258945Sroberto * 199258945Sroberto * Whenever a vnode is allocated, its v_data field is updated to 200258945Sroberto * point to the node it references. At the same time, the node's 201258945Sroberto * tn_vnode field is modified to point to the new vnode representing 202280849Scy * it. Further attempts to allocate a vnode for this same node will 203258945Sroberto * result in returning a new reference to the value stored in 204258945Sroberto * tn_vnode. 205258945Sroberto * 206258945Sroberto * May be NULL when the node is unused (that is, no vnode has been 207258945Sroberto * allocated for it or it has been reclaimed). */ 208280849Scy struct vnode * tn_vnode; 209258945Sroberto 210258945Sroberto /* interlock to protect tn_vpstate */ 211258945Sroberto struct mtx tn_interlock; 212258945Sroberto 213258945Sroberto /* Identify if current node has vnode assiocate with 214258945Sroberto * or allocating vnode. 215258945Sroberto */ 216258945Sroberto int tn_vpstate; 217258945Sroberto 218258945Sroberto /* misc data field for different tn_type node */ 219258945Sroberto union { 220258945Sroberto /* Valid when tn_type == VBLK || tn_type == VCHR. */ 221258945Sroberto dev_t tn_rdev; 222258945Sroberto 223258945Sroberto /* Valid when tn_type == VDIR. */ 224258945Sroberto struct tn_dir { 225258945Sroberto /* Pointer to the parent directory. The root 226258945Sroberto * directory has a pointer to itself in this field; 227258945Sroberto * this property identifies the root node. */ 228258945Sroberto struct tmpfs_node * tn_parent; 229258945Sroberto 230258945Sroberto /* Head of a tree that links the contents of 231258945Sroberto * the directory together. */ 232258945Sroberto struct tmpfs_dir tn_dirhead; 233258945Sroberto 234258945Sroberto /* Head of a list the contains fake directory entries 235258945Sroberto * heads, i.e. entries with TMPFS_DIRCOOKIE_DUPHEAD 236258945Sroberto * flag. */ 237258945Sroberto struct tmpfs_dir_duphead tn_dupindex; 238258945Sroberto 239258945Sroberto /* Number and pointer of the first directory entry 240258945Sroberto * returned by the readdir operation if it were 241280849Scy * called again to continue reading data from the 242280849Scy * same directory as before. This is used to speed 243258945Sroberto * up reads of long directories, assuming that no 244258945Sroberto * more than one read is in progress at a given time. 245280849Scy * Otherwise, these values are discarded. */ 246258945Sroberto off_t tn_readdir_lastn; 247258945Sroberto struct tmpfs_dirent * tn_readdir_lastp; 248258945Sroberto } tn_dir; 249290000Sglebius 250258945Sroberto /* Valid when tn_type == VLNK. */ 251258945Sroberto /* The link's target, allocated from a string pool. */ 252258945Sroberto char * tn_link; 253258945Sroberto 254258945Sroberto /* Valid when tn_type == VREG. */ 255258945Sroberto struct tn_reg { 256258945Sroberto /* The contents of regular files stored in a tmpfs 257258945Sroberto * file system are represented by a single anonymous 258258945Sroberto * memory object (aobj, for short). The aobj provides 259258945Sroberto * direct access to any position within the file, 260258945Sroberto * because its contents are always mapped in a 261258945Sroberto * contiguous region of virtual memory. It is a task 262258945Sroberto * of the memory management subsystem (see uvm(9)) to 263258945Sroberto * issue the required page ins or page outs whenever 264258945Sroberto * a position within the file is accessed. */ 265258945Sroberto vm_object_t tn_aobj; 266258945Sroberto 267258945Sroberto }tn_reg; 268258945Sroberto 269258945Sroberto /* Valid when tn_type = VFIFO */ 270258945Sroberto struct tn_fifo { 271258945Sroberto fo_rdwr_t *tn_fo_read; 272258945Sroberto fo_rdwr_t *tn_fo_write; 273258945Sroberto }tn_fifo; 274258945Sroberto }tn_spec; 275258945Sroberto}; 276258945SrobertoLIST_HEAD(tmpfs_node_list, tmpfs_node); 277258945Sroberto 278258945Sroberto#define tn_rdev tn_spec.tn_rdev 279258945Sroberto#define tn_dir tn_spec.tn_dir 280258945Sroberto#define tn_link tn_spec.tn_link 281258945Sroberto#define tn_reg tn_spec.tn_reg 282258945Sroberto#define tn_fifo tn_spec.tn_fifo 283258945Sroberto 284258945Sroberto#define TMPFS_NODE_LOCK(node) mtx_lock(&(node)->tn_interlock) 285258945Sroberto#define TMPFS_NODE_UNLOCK(node) mtx_unlock(&(node)->tn_interlock) 286258945Sroberto#define TMPFS_NODE_MTX(node) (&(node)->tn_interlock) 287258945Sroberto 288258945Sroberto#ifdef INVARIANTS 289258945Sroberto#define TMPFS_ASSERT_LOCKED(node) do { \ 290258945Sroberto MPASS(node != NULL); \ 291280849Scy MPASS(node->tn_vnode != NULL); \ 292258945Sroberto if (!VOP_ISLOCKED(node->tn_vnode) && \ 293258945Sroberto !mtx_owned(TMPFS_NODE_MTX(node))) \ 294280849Scy panic("tmpfs: node is not locked: %p", node); \ 295280849Scy } while (0) 296280849Scy#define TMPFS_ASSERT_ELOCKED(node) do { \ 297280849Scy MPASS((node) != NULL); \ 298280849Scy MPASS((node)->tn_vnode != NULL); \ 299280849Scy mtx_assert(TMPFS_NODE_MTX(node), MA_OWNED); \ 300280849Scy ASSERT_VOP_LOCKED((node)->tn_vnode, "tmpfs"); \ 301258945Sroberto } while (0) 302#else 303#define TMPFS_ASSERT_LOCKED(node) (void)0 304#define TMPFS_ASSERT_ELOCKED(node) (void)0 305#endif 306 307#define TMPFS_VNODE_ALLOCATING 1 308#define TMPFS_VNODE_WANT 2 309#define TMPFS_VNODE_DOOMED 4 310#define TMPFS_VNODE_WRECLAIM 8 311/* --------------------------------------------------------------------- */ 312 313/* 314 * Internal representation of a tmpfs mount point. 315 */ 316struct tmpfs_mount { 317 /* Maximum number of memory pages available for use by the file 318 * system, set during mount time. This variable must never be 319 * used directly as it may be bigger than the current amount of 320 * free memory; in the extreme case, it will hold the SIZE_MAX 321 * value. */ 322 size_t tm_pages_max; 323 324 /* Number of pages in use by the file system. */ 325 size_t tm_pages_used; 326 327 /* Pointer to the node representing the root directory of this 328 * file system. */ 329 struct tmpfs_node * tm_root; 330 331 /* Maximum number of possible nodes for this file system; set 332 * during mount time. We need a hard limit on the maximum number 333 * of nodes to avoid allocating too much of them; their objects 334 * cannot be released until the file system is unmounted. 335 * Otherwise, we could easily run out of memory by creating lots 336 * of empty files and then simply removing them. */ 337 ino_t tm_nodes_max; 338 339 /* unrhdr used to allocate inode numbers */ 340 struct unrhdr * tm_ino_unr; 341 342 /* Number of nodes currently that are in use. */ 343 ino_t tm_nodes_inuse; 344 345 /* maximum representable file size */ 346 u_int64_t tm_maxfilesize; 347 348 /* Nodes are organized in two different lists. The used list 349 * contains all nodes that are currently used by the file system; 350 * i.e., they refer to existing files. The available list contains 351 * all nodes that are currently available for use by new files. 352 * Nodes must be kept in this list (instead of deleting them) 353 * because we need to keep track of their generation number (tn_gen 354 * field). 355 * 356 * Note that nodes are lazily allocated: if the available list is 357 * empty and we have enough space to create more nodes, they will be 358 * created and inserted in the used list. Once these are released, 359 * they will go into the available list, remaining alive until the 360 * file system is unmounted. */ 361 struct tmpfs_node_list tm_nodes_used; 362 363 /* All node lock to protect the node list and tmp_pages_used */ 364 struct mtx allnode_lock; 365 366 /* Pools used to store file system meta data. These are not shared 367 * across several instances of tmpfs for the reasons described in 368 * tmpfs_pool.c. */ 369 uma_zone_t tm_dirent_pool; 370 uma_zone_t tm_node_pool; 371 372 /* Read-only status. */ 373 int tm_ronly; 374}; 375#define TMPFS_LOCK(tm) mtx_lock(&(tm)->allnode_lock) 376#define TMPFS_UNLOCK(tm) mtx_unlock(&(tm)->allnode_lock) 377 378/* --------------------------------------------------------------------- */ 379 380/* 381 * This structure maps a file identifier to a tmpfs node. Used by the 382 * NFS code. 383 */ 384struct tmpfs_fid { 385 uint16_t tf_len; 386 uint16_t tf_pad; 387 ino_t tf_id; 388 unsigned long tf_gen; 389}; 390 391/* --------------------------------------------------------------------- */ 392 393#ifdef _KERNEL 394/* 395 * Prototypes for tmpfs_subr.c. 396 */ 397 398int tmpfs_alloc_node(struct tmpfs_mount *, enum vtype, 399 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *, 400 char *, dev_t, struct tmpfs_node **); 401void tmpfs_free_node(struct tmpfs_mount *, struct tmpfs_node *); 402int tmpfs_alloc_dirent(struct tmpfs_mount *, struct tmpfs_node *, 403 const char *, u_int, struct tmpfs_dirent **); 404void tmpfs_free_dirent(struct tmpfs_mount *, struct tmpfs_dirent *); 405void tmpfs_dirent_init(struct tmpfs_dirent *, const char *, u_int); 406void tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj); 407int tmpfs_alloc_vp(struct mount *, struct tmpfs_node *, int, 408 struct vnode **); 409void tmpfs_free_vp(struct vnode *); 410int tmpfs_alloc_file(struct vnode *, struct vnode **, struct vattr *, 411 struct componentname *, char *); 412void tmpfs_dir_attach(struct vnode *, struct tmpfs_dirent *); 413void tmpfs_dir_detach(struct vnode *, struct tmpfs_dirent *); 414void tmpfs_dir_destroy(struct tmpfs_mount *, struct tmpfs_node *); 415struct tmpfs_dirent * tmpfs_dir_lookup(struct tmpfs_node *node, 416 struct tmpfs_node *f, 417 struct componentname *cnp); 418int tmpfs_dir_getdents(struct tmpfs_node *, struct uio *, int, 419 u_long *, int *); 420int tmpfs_dir_whiteout_add(struct vnode *, struct componentname *); 421void tmpfs_dir_whiteout_remove(struct vnode *, struct componentname *); 422int tmpfs_reg_resize(struct vnode *, off_t, boolean_t); 423int tmpfs_chflags(struct vnode *, u_long, struct ucred *, struct thread *); 424int tmpfs_chmod(struct vnode *, mode_t, struct ucred *, struct thread *); 425int tmpfs_chown(struct vnode *, uid_t, gid_t, struct ucred *, 426 struct thread *); 427int tmpfs_chsize(struct vnode *, u_quad_t, struct ucred *, struct thread *); 428int tmpfs_chtimes(struct vnode *, struct timespec *, struct timespec *, 429 struct timespec *, int, struct ucred *, struct thread *); 430void tmpfs_itimes(struct vnode *, const struct timespec *, 431 const struct timespec *); 432 433void tmpfs_update(struct vnode *); 434int tmpfs_truncate(struct vnode *, off_t); 435 436/* --------------------------------------------------------------------- */ 437 438/* 439 * Convenience macros to simplify some logical expressions. 440 */ 441#define IMPLIES(a, b) (!(a) || (b)) 442#define IFF(a, b) (IMPLIES(a, b) && IMPLIES(b, a)) 443 444/* --------------------------------------------------------------------- */ 445 446/* 447 * Checks that the directory entry pointed by 'de' matches the name 'name' 448 * with a length of 'len'. 449 */ 450#define TMPFS_DIRENT_MATCHES(de, name, len) \ 451 (de->td_namelen == len && \ 452 bcmp((de)->ud.td_name, (name), (de)->td_namelen) == 0) 453 454/* --------------------------------------------------------------------- */ 455 456/* 457 * Ensures that the node pointed by 'node' is a directory and that its 458 * contents are consistent with respect to directories. 459 */ 460#define TMPFS_VALIDATE_DIR(node) do { \ 461 MPASS((node)->tn_type == VDIR); \ 462 MPASS((node)->tn_size % sizeof(struct tmpfs_dirent) == 0); \ 463} while (0) 464 465/* --------------------------------------------------------------------- */ 466 467/* 468 * Memory management stuff. 469 */ 470 471/* 472 * Amount of memory pages to reserve for the system (e.g., to not use by 473 * tmpfs). 474 */ 475#define TMPFS_PAGES_MINRESERVED (4 * 1024 * 1024 / PAGE_SIZE) 476 477size_t tmpfs_mem_avail(void); 478 479size_t tmpfs_pages_used(struct tmpfs_mount *tmp); 480 481#endif 482 483/* --------------------------------------------------------------------- */ 484 485/* 486 * Macros/functions to convert from generic data structures to tmpfs 487 * specific ones. 488 */ 489 490static inline 491struct tmpfs_mount * 492VFS_TO_TMPFS(struct mount *mp) 493{ 494 struct tmpfs_mount *tmp; 495 496 MPASS((mp) != NULL && (mp)->mnt_data != NULL); 497 tmp = (struct tmpfs_mount *)(mp)->mnt_data; 498 return tmp; 499} 500 501static inline 502struct tmpfs_node * 503VP_TO_TMPFS_NODE(struct vnode *vp) 504{ 505 struct tmpfs_node *node; 506 507 MPASS((vp) != NULL && (vp)->v_data != NULL); 508 node = (struct tmpfs_node *)vp->v_data; 509 return node; 510} 511 512static inline 513struct tmpfs_node * 514VP_TO_TMPFS_DIR(struct vnode *vp) 515{ 516 struct tmpfs_node *node; 517 518 node = VP_TO_TMPFS_NODE(vp); 519 TMPFS_VALIDATE_DIR(node); 520 return node; 521} 522 523#endif /* _FS_TMPFS_TMPFS_H_ */ 524