1 /* $NetBSD: tmpfs.h,v 1.26 2007/02/22 06:37:00 thorpej 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 * $FreeBSD$ 35 */ 36 37 #ifndef _FS_TMPFS_TMPFS_H_ 38 #define _FS_TMPFS_TMPFS_H_ 39 40 #include <sys/cdefs.h> 41 #include <sys/queue.h> 42 #include <sys/tree.h> 43 44 #ifdef _SYS_MALLOC_H_ 45 MALLOC_DECLARE(M_TMPFSNAME); 46 #endif 47 48 #define OBJ_TMPFS OBJ_PAGERPRIV1 /* has tmpfs vnode allocated */ 49 #define OBJ_TMPFS_VREF OBJ_PAGERPRIV2 /* vnode is referenced */ 50 51 /* 52 * Internal representation of a tmpfs directory entry. 53 */ 54 55 LIST_HEAD(tmpfs_dir_duphead, tmpfs_dirent); 56 57 struct tmpfs_dirent { 58 /* 59 * Depending on td_cookie flag entry can be of 3 types: 60 * - regular -- no hash collisions, stored in RB-Tree 61 * - duphead -- synthetic linked list head for dup entries 62 * - dup -- stored in linked list instead of RB-Tree 63 */ 64 union { 65 /* regular and duphead entry types */ 66 RB_ENTRY(tmpfs_dirent) td_entries; 67 68 /* dup entry type */ 69 struct { 70 LIST_ENTRY(tmpfs_dirent) entries; 71 LIST_ENTRY(tmpfs_dirent) index_entries; 72 } td_dup; 73 } uh; 74 75 uint32_t td_cookie; 76 uint32_t td_hash; 77 u_int td_namelen; 78 79 /* 80 * Pointer to the node this entry refers to. In case this field 81 * is NULL, the node is a whiteout. 82 */ 83 struct tmpfs_node * td_node; 84 85 union { 86 /* 87 * The name of the entry, allocated from a string pool. This 88 * string is not required to be zero-terminated. 89 */ 90 char * td_name; /* regular, dup */ 91 struct tmpfs_dir_duphead td_duphead; /* duphead */ 92 } ud; 93 }; 94 95 /* 96 * A directory in tmpfs holds a collection of directory entries, which 97 * in turn point to other files (which can be directories themselves). 98 * 99 * In tmpfs, this collection is managed by a RB-Tree, whose head is 100 * defined by the struct tmpfs_dir type. 101 * 102 * It is important to notice that directories do not have entries for . and 103 * .. as other file systems do. These can be generated when requested 104 * based on information available by other means, such as the pointer to 105 * the node itself in the former case or the pointer to the parent directory 106 * in the latter case. This is done to simplify tmpfs's code and, more 107 * importantly, to remove redundancy. 108 */ 109 RB_HEAD(tmpfs_dir, tmpfs_dirent); 110 111 /* 112 * Each entry in a directory has a cookie that identifies it. Cookies 113 * supersede offsets within directories because, given how tmpfs stores 114 * directories in memory, there is no such thing as an offset. 115 * 116 * The '.', '..' and the end of directory markers have fixed cookies which 117 * cannot collide with the cookies generated by other entries. The cookies 118 * for the other entries are generated based on the file name hash value or 119 * unique number in case of name hash collision. 120 * 121 * To preserve compatibility cookies are limited to 31 bits. 122 */ 123 124 #define TMPFS_DIRCOOKIE_DOT 0 125 #define TMPFS_DIRCOOKIE_DOTDOT 1 126 #define TMPFS_DIRCOOKIE_EOF 2 127 #define TMPFS_DIRCOOKIE_MASK ((off_t)0x3fffffffU) 128 #define TMPFS_DIRCOOKIE_MIN ((off_t)0x00000004U) 129 #define TMPFS_DIRCOOKIE_DUP ((off_t)0x40000000U) 130 #define TMPFS_DIRCOOKIE_DUPHEAD ((off_t)0x80000000U) 131 #define TMPFS_DIRCOOKIE_DUP_MIN TMPFS_DIRCOOKIE_DUP 132 #define TMPFS_DIRCOOKIE_DUP_MAX \ 133 (TMPFS_DIRCOOKIE_DUP | TMPFS_DIRCOOKIE_MASK) 134 135 /* 136 * Internal representation of a tmpfs file system node. 137 * 138 * This structure is splitted in two parts: one holds attributes common 139 * to all file types and the other holds data that is only applicable to 140 * a particular type. The code must be careful to only access those 141 * attributes that are actually allowed by the node's type. 142 * 143 * Below is the key of locks used to protected the fields in the following 144 * structures. 145 * (v) vnode lock in exclusive mode 146 * (vi) vnode lock in exclusive mode, or vnode lock in shared vnode and 147 * tn_interlock 148 * (i) tn_interlock 149 * (m) tmpfs_mount tm_allnode_lock 150 * (c) stable after creation 151 * (v) tn_reg.tn_aobj vm_object lock 152 */ 153 struct tmpfs_node { 154 /* 155 * Doubly-linked list entry which links all existing nodes for 156 * a single file system. This is provided to ease the removal 157 * of all nodes during the unmount operation, and to support 158 * the implementation of VOP_VNTOCNP(). tn_attached is false 159 * when the node is removed from list and unlocked. 160 */ 161 LIST_ENTRY(tmpfs_node) tn_entries; /* (m) */ 162 163 /* Node identifier. */ 164 ino_t tn_id; /* (c) */ 165 166 /* 167 * The node's type. Any of 'VBLK', 'VCHR', 'VDIR', 'VFIFO', 168 * 'VLNK', 'VREG' and 'VSOCK' is allowed. The usage of vnode 169 * types instead of a custom enumeration is to make things simpler 170 * and faster, as we do not need to convert between two types. 171 */ 172 enum vtype tn_type; /* (c) */ 173 174 /* 175 * See the top comment. Reordered here to fill LP64 hole. 176 */ 177 bool tn_attached; /* (m) */ 178 179 /* 180 * Node's internal status. This is used by several file system 181 * operations to do modifications to the node in a delayed 182 * fashion. 183 * 184 * tn_accessed has a dedicated byte to allow update by store without 185 * using atomics. This provides a micro-optimization to e.g. 186 * tmpfs_read_pgcache(). 187 */ 188 uint8_t tn_status; /* (vi) */ 189 uint8_t tn_accessed; /* unlocked */ 190 191 /* 192 * The node size. It does not necessarily match the real amount 193 * of memory consumed by it. 194 */ 195 off_t tn_size; /* (v) */ 196 197 /* Generic node attributes. */ 198 uid_t tn_uid; /* (v) */ 199 gid_t tn_gid; /* (v) */ 200 mode_t tn_mode; /* (v) */ 201 int tn_links; /* (v) */ 202 u_long tn_flags; /* (v) */ 203 struct timespec tn_atime; /* (vi) */ 204 struct timespec tn_mtime; /* (vi) */ 205 struct timespec tn_ctime; /* (vi) */ 206 struct timespec tn_birthtime; /* (v) */ 207 unsigned long tn_gen; /* (c) */ 208 209 /* 210 * As there is a single vnode for each active file within the 211 * system, care has to be taken to avoid allocating more than one 212 * vnode per file. In order to do this, a bidirectional association 213 * is kept between vnodes and nodes. 214 * 215 * Whenever a vnode is allocated, its v_data field is updated to 216 * point to the node it references. At the same time, the node's 217 * tn_vnode field is modified to point to the new vnode representing 218 * it. Further attempts to allocate a vnode for this same node will 219 * result in returning a new reference to the value stored in 220 * tn_vnode. 221 * 222 * May be NULL when the node is unused (that is, no vnode has been 223 * allocated for it or it has been reclaimed). 224 */ 225 struct vnode * tn_vnode; /* (i) */ 226 227 /* 228 * Interlock to protect tn_vpstate, and tn_status under shared 229 * vnode lock. 230 */ 231 struct mtx tn_interlock; 232 233 /* 234 * Identify if current node has vnode assiocate with 235 * or allocating vnode. 236 */ 237 int tn_vpstate; /* (i) */ 238 239 /* Transient refcounter on this node. */ 240 u_int tn_refcount; /* 0<->1 (m) + (i) */ 241 242 /* misc data field for different tn_type node */ 243 union { 244 /* Valid when tn_type == VBLK || tn_type == VCHR. */ 245 dev_t tn_rdev; /* (c) */ 246 247 /* Valid when tn_type == VDIR. */ 248 struct tn_dir { 249 /* 250 * Pointer to the parent directory. The root 251 * directory has a pointer to itself in this field; 252 * this property identifies the root node. 253 */ 254 struct tmpfs_node * tn_parent; 255 256 /* 257 * Head of a tree that links the contents of 258 * the directory together. 259 */ 260 struct tmpfs_dir tn_dirhead; 261 262 /* 263 * Head of a list the contains fake directory entries 264 * heads, i.e. entries with TMPFS_DIRCOOKIE_DUPHEAD 265 * flag. 266 */ 267 struct tmpfs_dir_duphead tn_dupindex; 268 269 /* 270 * Number and pointer of the first directory entry 271 * returned by the readdir operation if it were 272 * called again to continue reading data from the 273 * same directory as before. This is used to speed 274 * up reads of long directories, assuming that no 275 * more than one read is in progress at a given time. 276 * Otherwise, these values are discarded. 277 */ 278 off_t tn_readdir_lastn; 279 struct tmpfs_dirent * tn_readdir_lastp; 280 } tn_dir; 281 282 /* Valid when tn_type == VLNK. */ 283 /* The link's target, allocated from a string pool. */ 284 struct tn_link { 285 char * tn_link_target; /* (c) */ 286 char tn_link_smr; /* (c) */ 287 } tn_link; 288 289 /* Valid when tn_type == VREG. */ 290 struct tn_reg { 291 /* 292 * The contents of regular files stored in a 293 * tmpfs file system are represented by a 294 * single anonymous memory object (aobj, for 295 * short). The aobj provides direct access to 296 * any position within the file. It is a task 297 * of the memory management subsystem to issue 298 * the required page ins or page outs whenever 299 * a position within the file is accessed. 300 */ 301 vm_object_t tn_aobj; /* (c) */ 302 struct tmpfs_mount *tn_tmp; /* (c) */ 303 vm_pindex_t tn_pages; /* (v) */ 304 } tn_reg; 305 } tn_spec; /* (v) */ 306 }; 307 LIST_HEAD(tmpfs_node_list, tmpfs_node); 308 309 #define tn_rdev tn_spec.tn_rdev 310 #define tn_dir tn_spec.tn_dir 311 #define tn_link_target tn_spec.tn_link.tn_link_target 312 #define tn_link_smr tn_spec.tn_link.tn_link_smr 313 #define tn_reg tn_spec.tn_reg 314 #define tn_fifo tn_spec.tn_fifo 315 316 #define TMPFS_LINK_MAX INT_MAX 317 318 #define TMPFS_NODE_LOCK(node) mtx_lock(&(node)->tn_interlock) 319 #define TMPFS_NODE_UNLOCK(node) mtx_unlock(&(node)->tn_interlock) 320 #define TMPFS_NODE_MTX(node) (&(node)->tn_interlock) 321 #define TMPFS_NODE_ASSERT_LOCKED(node) mtx_assert(TMPFS_NODE_MTX(node), \ 322 MA_OWNED) 323 324 #ifdef INVARIANTS 325 #define TMPFS_ASSERT_LOCKED(node) do { \ 326 MPASS((node) != NULL); \ 327 MPASS((node)->tn_vnode != NULL); \ 328 ASSERT_VOP_LOCKED((node)->tn_vnode, "tmpfs assert"); \ 329 } while (0) 330 #else 331 #define TMPFS_ASSERT_LOCKED(node) (void)0 332 #endif 333 334 /* tn_vpstate */ 335 #define TMPFS_VNODE_ALLOCATING 1 336 #define TMPFS_VNODE_WANT 2 337 #define TMPFS_VNODE_DOOMED 4 338 #define TMPFS_VNODE_WRECLAIM 8 339 340 /* tn_status */ 341 #define TMPFS_NODE_MODIFIED 0x01 342 #define TMPFS_NODE_CHANGED 0x02 343 344 /* 345 * Internal representation of a tmpfs mount point. 346 */ 347 struct tmpfs_mount { 348 /* 349 * Original value of the "size" parameter, for reference purposes, 350 * mostly. 351 */ 352 off_t tm_size_max; 353 /* 354 * Maximum number of memory pages available for use by the file 355 * system, set during mount time. This variable must never be 356 * used directly as it may be bigger than the current amount of 357 * free memory; in the extreme case, it will hold the ULONG_MAX 358 * value. 359 */ 360 u_long tm_pages_max; 361 362 /* Number of pages in use by the file system. */ 363 u_long tm_pages_used; 364 365 /* 366 * Pointer to the node representing the root directory of this 367 * file system. 368 */ 369 struct tmpfs_node * tm_root; 370 371 /* 372 * Maximum number of possible nodes for this file system; set 373 * during mount time. We need a hard limit on the maximum number 374 * of nodes to avoid allocating too much of them; their objects 375 * cannot be released until the file system is unmounted. 376 * Otherwise, we could easily run out of memory by creating lots 377 * of empty files and then simply removing them. 378 */ 379 ino_t tm_nodes_max; 380 381 /* unrhdr used to allocate inode numbers */ 382 struct unrhdr64 tm_ino_unr; 383 384 /* Number of nodes currently that are in use. */ 385 ino_t tm_nodes_inuse; 386 387 /* Refcounter on this struct tmpfs_mount. */ 388 uint64_t tm_refcount; 389 390 /* maximum representable file size */ 391 u_int64_t tm_maxfilesize; 392 393 /* 394 * The used list contains all nodes that are currently used by 395 * the file system; i.e., they refer to existing files. 396 */ 397 struct tmpfs_node_list tm_nodes_used; 398 399 /* All node lock to protect the node list and tmp_pages_used. */ 400 struct mtx tm_allnode_lock; 401 402 /* Read-only status. */ 403 bool tm_ronly; 404 /* Do not use namecache. */ 405 bool tm_nonc; 406 /* Do not update mtime on writes through mmaped areas. */ 407 bool tm_nomtime; 408 }; 409 #define TMPFS_LOCK(tm) mtx_lock(&(tm)->tm_allnode_lock) 410 #define TMPFS_UNLOCK(tm) mtx_unlock(&(tm)->tm_allnode_lock) 411 #define TMPFS_MP_ASSERT_LOCKED(tm) mtx_assert(&(tm)->tm_allnode_lock, MA_OWNED) 412 413 /* 414 * This structure maps a file identifier to a tmpfs node. Used by the 415 * NFS code. 416 */ 417 struct tmpfs_fid_data { 418 ino_t tfd_id; 419 unsigned long tfd_gen; 420 }; 421 _Static_assert(sizeof(struct tmpfs_fid_data) <= MAXFIDSZ, 422 "(struct tmpfs_fid_data) is larger than (struct fid).fid_data"); 423 424 struct tmpfs_dir_cursor { 425 struct tmpfs_dirent *tdc_current; 426 struct tmpfs_dirent *tdc_tree; 427 }; 428 429 #ifdef _KERNEL 430 /* 431 * Prototypes for tmpfs_subr.c. 432 */ 433 434 void tmpfs_ref_node(struct tmpfs_node *node); 435 int tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *, enum vtype, 436 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *, 437 const char *, dev_t, struct tmpfs_node **); 438 int tmpfs_fo_close(struct file *fp, struct thread *td); 439 void tmpfs_free_node(struct tmpfs_mount *, struct tmpfs_node *); 440 bool tmpfs_free_node_locked(struct tmpfs_mount *, struct tmpfs_node *, bool); 441 void tmpfs_free_tmp(struct tmpfs_mount *); 442 int tmpfs_alloc_dirent(struct tmpfs_mount *, struct tmpfs_node *, 443 const char *, u_int, struct tmpfs_dirent **); 444 void tmpfs_free_dirent(struct tmpfs_mount *, struct tmpfs_dirent *); 445 void tmpfs_dirent_init(struct tmpfs_dirent *, const char *, u_int); 446 void tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj); 447 int tmpfs_alloc_vp(struct mount *, struct tmpfs_node *, int, 448 struct vnode **); 449 void tmpfs_free_vp(struct vnode *); 450 int tmpfs_alloc_file(struct vnode *, struct vnode **, struct vattr *, 451 struct componentname *, const char *); 452 void tmpfs_check_mtime(struct vnode *); 453 void tmpfs_dir_attach(struct vnode *, struct tmpfs_dirent *); 454 void tmpfs_dir_detach(struct vnode *, struct tmpfs_dirent *); 455 void tmpfs_dir_destroy(struct tmpfs_mount *, struct tmpfs_node *); 456 struct tmpfs_dirent * tmpfs_dir_lookup(struct tmpfs_node *node, 457 struct tmpfs_node *f, 458 struct componentname *cnp); 459 int tmpfs_dir_getdents(struct tmpfs_mount *, struct tmpfs_node *, 460 struct uio *, int, uint64_t *, int *); 461 int tmpfs_dir_whiteout_add(struct vnode *, struct componentname *); 462 void tmpfs_dir_whiteout_remove(struct vnode *, struct componentname *); 463 int tmpfs_reg_resize(struct vnode *, off_t, boolean_t); 464 int tmpfs_reg_punch_hole(struct vnode *vp, off_t *, off_t *); 465 int tmpfs_chflags(struct vnode *, u_long, struct ucred *, struct thread *); 466 int tmpfs_chmod(struct vnode *, mode_t, struct ucred *, struct thread *); 467 int tmpfs_chown(struct vnode *, uid_t, gid_t, struct ucred *, 468 struct thread *); 469 int tmpfs_chsize(struct vnode *, u_quad_t, struct ucred *, struct thread *); 470 int tmpfs_chtimes(struct vnode *, struct vattr *, struct ucred *cred, 471 struct thread *); 472 void tmpfs_itimes(struct vnode *, const struct timespec *, 473 const struct timespec *); 474 475 void tmpfs_set_accessed(struct tmpfs_mount *tm, struct tmpfs_node *node); 476 void tmpfs_set_status(struct tmpfs_mount *tm, struct tmpfs_node *node, 477 int status); 478 int tmpfs_truncate(struct vnode *, off_t); 479 struct tmpfs_dirent *tmpfs_dir_first(struct tmpfs_node *dnode, 480 struct tmpfs_dir_cursor *dc); 481 struct tmpfs_dirent *tmpfs_dir_next(struct tmpfs_node *dnode, 482 struct tmpfs_dir_cursor *dc); 483 static __inline void 484 tmpfs_update(struct vnode *vp) 485 { 486 487 tmpfs_itimes(vp, NULL, NULL); 488 } 489 490 /* 491 * Convenience macros to simplify some logical expressions. 492 */ 493 #define IMPLIES(a, b) (!(a) || (b)) 494 #define IFF(a, b) (IMPLIES(a, b) && IMPLIES(b, a)) 495 496 /* 497 * Checks that the directory entry pointed by 'de' matches the name 'name' 498 * with a length of 'len'. 499 */ 500 #define TMPFS_DIRENT_MATCHES(de, name, len) \ 501 (de->td_namelen == len && \ 502 bcmp((de)->ud.td_name, (name), (de)->td_namelen) == 0) 503 504 /* 505 * Ensures that the node pointed by 'node' is a directory and that its 506 * contents are consistent with respect to directories. 507 */ 508 #define TMPFS_VALIDATE_DIR(node) do { \ 509 MPASS((node)->tn_type == VDIR); \ 510 MPASS((node)->tn_size % sizeof(struct tmpfs_dirent) == 0); \ 511 } while (0) 512 513 /* 514 * Amount of memory pages to reserve for the system (e.g., to not use by 515 * tmpfs). 516 */ 517 #if !defined(TMPFS_PAGES_MINRESERVED) 518 #define TMPFS_PAGES_MINRESERVED (4 * 1024 * 1024 / PAGE_SIZE) 519 #endif 520 521 size_t tmpfs_mem_avail(void); 522 size_t tmpfs_pages_used(struct tmpfs_mount *tmp); 523 int tmpfs_subr_init(void); 524 void tmpfs_subr_uninit(void); 525 526 extern int tmpfs_pager_type; 527 528 /* 529 * Macros/functions to convert from generic data structures to tmpfs 530 * specific ones. 531 */ 532 533 static inline struct vnode * 534 VM_TO_TMPFS_VP(vm_object_t obj) 535 { 536 struct tmpfs_node *node; 537 538 if ((obj->flags & OBJ_TMPFS) == 0) 539 return (NULL); 540 541 /* 542 * swp_priv is the back-pointer to the tmpfs node, if any, 543 * which uses the vm object as backing store. The object 544 * handle is not used to avoid locking sw_alloc_sx on tmpfs 545 * node instantiation/destroy. 546 */ 547 node = obj->un_pager.swp.swp_priv; 548 return (node->tn_vnode); 549 } 550 551 static inline struct tmpfs_mount * 552 VM_TO_TMPFS_MP(vm_object_t obj) 553 { 554 struct tmpfs_node *node; 555 556 if ((obj->flags & OBJ_TMPFS) == 0) 557 return (NULL); 558 559 node = obj->un_pager.swp.swp_priv; 560 MPASS(node->tn_type == VREG); 561 return (node->tn_reg.tn_tmp); 562 } 563 564 static inline struct tmpfs_mount * 565 VFS_TO_TMPFS(struct mount *mp) 566 { 567 struct tmpfs_mount *tmp; 568 569 MPASS(mp != NULL && mp->mnt_data != NULL); 570 tmp = (struct tmpfs_mount *)mp->mnt_data; 571 return (tmp); 572 } 573 574 static inline struct tmpfs_node * 575 VP_TO_TMPFS_NODE(struct vnode *vp) 576 { 577 struct tmpfs_node *node; 578 579 MPASS(vp != NULL && vp->v_data != NULL); 580 node = (struct tmpfs_node *)vp->v_data; 581 return (node); 582 } 583 584 #define VP_TO_TMPFS_NODE_SMR(vp) \ 585 ((struct tmpfs_node *)vn_load_v_data_smr(vp)) 586 587 static inline struct tmpfs_node * 588 VP_TO_TMPFS_DIR(struct vnode *vp) 589 { 590 struct tmpfs_node *node; 591 592 node = VP_TO_TMPFS_NODE(vp); 593 TMPFS_VALIDATE_DIR(node); 594 return (node); 595 } 596 597 static inline bool 598 tmpfs_use_nc(struct vnode *vp) 599 { 600 601 return (!(VFS_TO_TMPFS(vp->v_mount)->tm_nonc)); 602 } 603 604 static inline void 605 tmpfs_update_getattr(struct vnode *vp) 606 { 607 struct tmpfs_node *node; 608 609 node = VP_TO_TMPFS_NODE(vp); 610 if (__predict_false((node->tn_status & (TMPFS_NODE_MODIFIED | 611 TMPFS_NODE_CHANGED)) != 0 || node->tn_accessed)) 612 tmpfs_update(vp); 613 } 614 615 extern struct fileops tmpfs_fnops; 616 617 #endif /* _KERNEL */ 618 619 #endif /* _FS_TMPFS_TMPFS_H_ */ 620