1 /* $NetBSD: tmpfs.h,v 1.26 2007/02/22 06:37:00 thorpej Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause 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 #ifndef _FS_TMPFS_TMPFS_H_ 36 #define _FS_TMPFS_TMPFS_H_ 37 38 #include <sys/cdefs.h> 39 #include <sys/queue.h> 40 #include <sys/tree.h> 41 42 #ifdef _SYS_MALLOC_H_ 43 MALLOC_DECLARE(M_TMPFSNAME); 44 #endif 45 46 #define OBJ_TMPFS OBJ_PAGERPRIV1 /* has tmpfs vnode allocated */ 47 #define OBJ_TMPFS_VREF OBJ_PAGERPRIV2 /* vnode is referenced */ 48 49 /* 50 * Internal representation of a tmpfs directory entry. 51 */ 52 53 LIST_HEAD(tmpfs_dir_duphead, tmpfs_dirent); 54 55 struct tmpfs_dirent { 56 /* 57 * Depending on td_cookie flag entry can be of 3 types: 58 * - regular -- no hash collisions, stored in RB-Tree 59 * - duphead -- synthetic linked list head for dup entries 60 * - dup -- stored in linked list instead of RB-Tree 61 */ 62 union { 63 /* regular and duphead entry types */ 64 RB_ENTRY(tmpfs_dirent) td_entries; 65 66 /* dup entry type */ 67 struct { 68 LIST_ENTRY(tmpfs_dirent) entries; 69 LIST_ENTRY(tmpfs_dirent) index_entries; 70 } td_dup; 71 } uh; 72 73 uint32_t td_cookie; 74 uint32_t td_hash; 75 u_int td_namelen; 76 77 /* 78 * Pointer to the node this entry refers to. In case this field 79 * is NULL, the node is a whiteout. 80 */ 81 struct tmpfs_node * td_node; 82 83 union { 84 /* 85 * The name of the entry, allocated from a string pool. This 86 * string is not required to be zero-terminated. 87 */ 88 char * td_name; /* regular, dup */ 89 struct tmpfs_dir_duphead td_duphead; /* duphead */ 90 } ud; 91 }; 92 93 /* 94 * A directory in tmpfs holds a collection of directory entries, which 95 * in turn point to other files (which can be directories themselves). 96 * 97 * In tmpfs, this collection is managed by a RB-Tree, whose head is 98 * defined by the struct tmpfs_dir type. 99 * 100 * It is important to notice that directories do not have entries for . and 101 * .. as other file systems do. These can be generated when requested 102 * based on information available by other means, such as the pointer to 103 * the node itself in the former case or the pointer to the parent directory 104 * in the latter case. This is done to simplify tmpfs's code and, more 105 * importantly, to remove redundancy. 106 */ 107 RB_HEAD(tmpfs_dir, tmpfs_dirent); 108 109 /* 110 * Each entry in a directory has a cookie that identifies it. Cookies 111 * supersede offsets within directories because, given how tmpfs stores 112 * directories in memory, there is no such thing as an offset. 113 * 114 * The '.', '..' and the end of directory markers have fixed cookies which 115 * cannot collide with the cookies generated by other entries. The cookies 116 * for the other entries are generated based on the file name hash value or 117 * unique number in case of name hash collision. 118 * 119 * To preserve compatibility cookies are limited to 31 bits. 120 */ 121 122 #define TMPFS_DIRCOOKIE_DOT 0 123 #define TMPFS_DIRCOOKIE_DOTDOT 1 124 #define TMPFS_DIRCOOKIE_EOF 2 125 #define TMPFS_DIRCOOKIE_MASK ((off_t)0x3fffffffU) 126 #define TMPFS_DIRCOOKIE_MIN ((off_t)0x00000004U) 127 #define TMPFS_DIRCOOKIE_DUP ((off_t)0x40000000U) 128 #define TMPFS_DIRCOOKIE_DUPHEAD ((off_t)0x80000000U) 129 #define TMPFS_DIRCOOKIE_DUP_MIN TMPFS_DIRCOOKIE_DUP 130 #define TMPFS_DIRCOOKIE_DUP_MAX \ 131 (TMPFS_DIRCOOKIE_DUP | TMPFS_DIRCOOKIE_MASK) 132 133 /* 134 * Internal representation of a tmpfs extended attribute entry. 135 */ 136 LIST_HEAD(tmpfs_extattr_list, tmpfs_extattr); 137 138 struct tmpfs_extattr { 139 LIST_ENTRY(tmpfs_extattr) ea_extattrs; 140 int ea_namespace; /* attr namespace */ 141 char *ea_name; /* attr name */ 142 unsigned char ea_namelen; /* attr name length */ 143 char *ea_value; /* attr value buffer */ 144 ssize_t ea_size; /* attr value size */ 145 }; 146 147 /* 148 * Internal representation of a tmpfs file system node. 149 * 150 * This structure is splitted in two parts: one holds attributes common 151 * to all file types and the other holds data that is only applicable to 152 * a particular type. The code must be careful to only access those 153 * attributes that are actually allowed by the node's type. 154 * 155 * Below is the key of locks used to protected the fields in the following 156 * structures. 157 * (v) vnode lock in exclusive mode 158 * (vi) vnode lock in exclusive mode, or vnode lock in shared vnode and 159 * tn_interlock 160 * (i) tn_interlock 161 * (m) tmpfs_mount tm_allnode_lock 162 * (c) stable after creation 163 * (v) tn_reg.tn_aobj vm_object lock 164 */ 165 struct tmpfs_node { 166 /* 167 * Doubly-linked list entry which links all existing nodes for 168 * a single file system. This is provided to ease the removal 169 * of all nodes during the unmount operation, and to support 170 * the implementation of VOP_VNTOCNP(). tn_attached is false 171 * when the node is removed from list and unlocked. 172 */ 173 LIST_ENTRY(tmpfs_node) tn_entries; /* (m) */ 174 175 /* Node identifier. */ 176 ino_t tn_id; /* (c) */ 177 178 /* 179 * The node's type. Any of 'VBLK', 'VCHR', 'VDIR', 'VFIFO', 180 * 'VLNK', 'VREG' and 'VSOCK' is allowed. The usage of vnode 181 * types instead of a custom enumeration is to make things simpler 182 * and faster, as we do not need to convert between two types. 183 */ 184 __enum_uint8(vtype) tn_type; /* (c) */ 185 186 /* 187 * See the top comment. Reordered here to fill LP64 hole. 188 */ 189 bool tn_attached; /* (m) */ 190 191 /* 192 * Node's internal status. This is used by several file system 193 * operations to do modifications to the node in a delayed 194 * fashion. 195 * 196 * tn_accessed has a dedicated byte to allow update by store without 197 * using atomics. This provides a micro-optimization to e.g. 198 * tmpfs_read_pgcache(). 199 */ 200 uint8_t tn_status; /* (vi) */ 201 uint8_t tn_accessed; /* unlocked */ 202 203 /* 204 * The node size. It does not necessarily match the real amount 205 * of memory consumed by it. 206 */ 207 off_t tn_size; /* (v) */ 208 209 /* Generic node attributes. */ 210 uid_t tn_uid; /* (v) */ 211 gid_t tn_gid; /* (v) */ 212 mode_t tn_mode; /* (v) */ 213 int tn_links; /* (v) */ 214 u_long tn_flags; /* (v) */ 215 struct timespec tn_atime; /* (vi) */ 216 struct timespec tn_mtime; /* (vi) */ 217 struct timespec tn_ctime; /* (vi) */ 218 struct timespec tn_birthtime; /* (v) */ 219 unsigned long tn_gen; /* (c) */ 220 221 /* 222 * As there is a single vnode for each active file within the 223 * system, care has to be taken to avoid allocating more than one 224 * vnode per file. In order to do this, a bidirectional association 225 * is kept between vnodes and nodes. 226 * 227 * Whenever a vnode is allocated, its v_data field is updated to 228 * point to the node it references. At the same time, the node's 229 * tn_vnode field is modified to point to the new vnode representing 230 * it. Further attempts to allocate a vnode for this same node will 231 * result in returning a new reference to the value stored in 232 * tn_vnode. 233 * 234 * May be NULL when the node is unused (that is, no vnode has been 235 * allocated for it or it has been reclaimed). 236 */ 237 struct vnode * tn_vnode; /* (i) */ 238 239 /* 240 * Interlock to protect tn_vpstate, and tn_status under shared 241 * vnode lock. 242 */ 243 struct mtx tn_interlock; 244 245 /* 246 * Identify if current node has vnode assiocate with 247 * or allocating vnode. 248 */ 249 int tn_vpstate; /* (i) */ 250 251 /* Transient refcounter on this node. */ 252 u_int tn_refcount; /* 0<->1 (m) + (i) */ 253 254 /* Extended attributes of this node. */ 255 struct tmpfs_extattr_list tn_extattrs; /* (v) */ 256 257 /* misc data field for different tn_type node */ 258 union { 259 /* Valid when tn_type == VBLK || tn_type == VCHR. */ 260 dev_t tn_rdev; /* (c) */ 261 262 /* Valid when tn_type == VDIR. */ 263 struct tn_dir { 264 /* 265 * Pointer to the parent directory. The root 266 * directory has a pointer to itself in this field; 267 * this property identifies the root node. 268 */ 269 struct tmpfs_node * tn_parent; 270 271 /* 272 * Head of a tree that links the contents of 273 * the directory together. 274 */ 275 struct tmpfs_dir tn_dirhead; 276 277 /* 278 * Head of a list the contains fake directory entries 279 * heads, i.e. entries with TMPFS_DIRCOOKIE_DUPHEAD 280 * flag. 281 */ 282 struct tmpfs_dir_duphead tn_dupindex; 283 284 /* 285 * Number and pointer of the first directory entry 286 * returned by the readdir operation if it were 287 * called again to continue reading data from the 288 * same directory as before. This is used to speed 289 * up reads of long directories, assuming that no 290 * more than one read is in progress at a given time. 291 * Otherwise, these values are discarded. 292 */ 293 off_t tn_readdir_lastn; 294 struct tmpfs_dirent * tn_readdir_lastp; 295 } tn_dir; 296 297 /* Valid when tn_type == VLNK. */ 298 /* The link's target, allocated from a string pool. */ 299 struct tn_link { 300 char * tn_link_target; /* (c) */ 301 char tn_link_smr; /* (c) */ 302 } tn_link; 303 304 /* Valid when tn_type == VREG. */ 305 struct tn_reg { 306 /* 307 * The contents of regular files stored in a 308 * tmpfs file system are represented by a 309 * single anonymous memory object (aobj, for 310 * short). The aobj provides direct access to 311 * any position within the file. It is a task 312 * of the memory management subsystem to issue 313 * the required page ins or page outs whenever 314 * a position within the file is accessed. 315 */ 316 vm_object_t tn_aobj; /* (c) */ 317 struct tmpfs_mount *tn_tmp; /* (c) */ 318 vm_pindex_t tn_pages; /* (v) */ 319 } tn_reg; 320 } tn_spec; /* (v) */ 321 }; 322 LIST_HEAD(tmpfs_node_list, tmpfs_node); 323 324 #define tn_rdev tn_spec.tn_rdev 325 #define tn_dir tn_spec.tn_dir 326 #define tn_link_target tn_spec.tn_link.tn_link_target 327 #define tn_link_smr tn_spec.tn_link.tn_link_smr 328 #define tn_reg tn_spec.tn_reg 329 #define tn_fifo tn_spec.tn_fifo 330 331 #define TMPFS_LINK_MAX INT_MAX 332 333 #define TMPFS_NODE_LOCK(node) mtx_lock(&(node)->tn_interlock) 334 #define TMPFS_NODE_UNLOCK(node) mtx_unlock(&(node)->tn_interlock) 335 #define TMPFS_NODE_MTX(node) (&(node)->tn_interlock) 336 #define TMPFS_NODE_ASSERT_LOCKED(node) mtx_assert(TMPFS_NODE_MTX(node), \ 337 MA_OWNED) 338 339 #ifdef INVARIANTS 340 #define TMPFS_ASSERT_LOCKED(node) do { \ 341 MPASS((node) != NULL); \ 342 MPASS((node)->tn_vnode != NULL); \ 343 ASSERT_VOP_LOCKED((node)->tn_vnode, "tmpfs assert"); \ 344 } while (0) 345 #else 346 #define TMPFS_ASSERT_LOCKED(node) (void)0 347 #endif 348 349 /* tn_vpstate */ 350 #define TMPFS_VNODE_ALLOCATING 1 351 #define TMPFS_VNODE_WANT 2 352 #define TMPFS_VNODE_DOOMED 4 353 #define TMPFS_VNODE_WRECLAIM 8 354 355 /* tn_status */ 356 #define TMPFS_NODE_MODIFIED 0x01 357 #define TMPFS_NODE_CHANGED 0x02 358 359 /* 360 * Internal representation of a tmpfs mount point. 361 */ 362 struct tmpfs_mount { 363 /* 364 * Original value of the "size" parameter, for reference purposes, 365 * mostly. 366 */ 367 off_t tm_size_max; 368 /* 369 * Maximum number of memory pages available for use by the file 370 * system, set during mount time. This variable must never be 371 * used directly as it may be bigger than the current amount of 372 * free memory; in the extreme case, it will hold the ULONG_MAX 373 * value. 374 */ 375 u_long tm_pages_max; 376 377 /* Number of pages in use by the file system. */ 378 u_long tm_pages_used; 379 380 /* 381 * Pointer to the node representing the root directory of this 382 * file system. 383 */ 384 struct tmpfs_node * tm_root; 385 386 /* 387 * Maximum number of possible nodes for this file system; set 388 * during mount time. We need a hard limit on the maximum number 389 * of nodes to avoid allocating too much of them; their objects 390 * cannot be released until the file system is unmounted. 391 * Otherwise, we could easily run out of memory by creating lots 392 * of empty files and then simply removing them. 393 */ 394 ino_t tm_nodes_max; 395 396 /* unrhdr used to allocate inode numbers */ 397 struct unrhdr64 tm_ino_unr; 398 399 /* Number of nodes currently that are in use. */ 400 ino_t tm_nodes_inuse; 401 402 /* Memory used by extended attributes */ 403 uint64_t tm_ea_memory_inuse; 404 405 /* Maximum memory available for extended attributes */ 406 uint64_t tm_ea_memory_max; 407 408 /* Refcounter on this struct tmpfs_mount. */ 409 uint64_t tm_refcount; 410 411 /* maximum representable file size */ 412 u_int64_t tm_maxfilesize; 413 414 /* 415 * The used list contains all nodes that are currently used by 416 * the file system; i.e., they refer to existing files. 417 */ 418 struct tmpfs_node_list tm_nodes_used; 419 420 /* All node lock to protect the node list and tmp_pages_used. */ 421 struct mtx tm_allnode_lock; 422 423 /* Read-only status. */ 424 bool tm_ronly; 425 /* Do not use namecache. */ 426 bool tm_nonc; 427 /* Do not update mtime on writes through mmaped areas. */ 428 bool tm_nomtime; 429 430 /* Read from page cache directly. */ 431 bool tm_pgread; 432 }; 433 #define TMPFS_LOCK(tm) mtx_lock(&(tm)->tm_allnode_lock) 434 #define TMPFS_UNLOCK(tm) mtx_unlock(&(tm)->tm_allnode_lock) 435 #define TMPFS_MP_ASSERT_LOCKED(tm) mtx_assert(&(tm)->tm_allnode_lock, MA_OWNED) 436 437 /* 438 * This structure maps a file identifier to a tmpfs node. Used by the 439 * NFS code. 440 */ 441 struct tmpfs_fid_data { 442 ino_t tfd_id; 443 unsigned long tfd_gen; 444 }; 445 _Static_assert(sizeof(struct tmpfs_fid_data) <= MAXFIDSZ, 446 "(struct tmpfs_fid_data) is larger than (struct fid).fid_data"); 447 448 struct tmpfs_dir_cursor { 449 struct tmpfs_dirent *tdc_current; 450 struct tmpfs_dirent *tdc_tree; 451 }; 452 453 #ifdef _KERNEL 454 /* 455 * Prototypes for tmpfs_subr.c. 456 */ 457 458 void tmpfs_ref_node(struct tmpfs_node *node); 459 int tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *, __enum_uint8(vtype), 460 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *, 461 const char *, dev_t, struct tmpfs_node **); 462 int tmpfs_fo_close(struct file *fp, struct thread *td); 463 void tmpfs_free_node(struct tmpfs_mount *, struct tmpfs_node *); 464 bool tmpfs_free_node_locked(struct tmpfs_mount *, struct tmpfs_node *, bool); 465 void tmpfs_free_tmp(struct tmpfs_mount *); 466 int tmpfs_alloc_dirent(struct tmpfs_mount *, struct tmpfs_node *, 467 const char *, u_int, struct tmpfs_dirent **); 468 void tmpfs_free_dirent(struct tmpfs_mount *, struct tmpfs_dirent *); 469 void tmpfs_dirent_init(struct tmpfs_dirent *, const char *, u_int); 470 void tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj); 471 int tmpfs_alloc_vp(struct mount *, struct tmpfs_node *, int, 472 struct vnode **); 473 void tmpfs_free_vp(struct vnode *); 474 int tmpfs_alloc_file(struct vnode *, struct vnode **, struct vattr *, 475 struct componentname *, const char *); 476 void tmpfs_check_mtime(struct vnode *); 477 void tmpfs_dir_attach(struct vnode *, struct tmpfs_dirent *); 478 void tmpfs_dir_detach(struct vnode *, struct tmpfs_dirent *); 479 void tmpfs_dir_destroy(struct tmpfs_mount *, struct tmpfs_node *); 480 struct tmpfs_dirent * tmpfs_dir_lookup(struct tmpfs_node *node, 481 struct tmpfs_node *f, 482 struct componentname *cnp); 483 int tmpfs_dir_getdents(struct tmpfs_mount *, struct tmpfs_node *, 484 struct uio *, int, uint64_t *, int *); 485 int tmpfs_dir_whiteout_add(struct vnode *, struct componentname *); 486 void tmpfs_dir_whiteout_remove(struct vnode *, struct componentname *); 487 int tmpfs_reg_resize(struct vnode *, off_t, boolean_t); 488 int tmpfs_reg_punch_hole(struct vnode *vp, off_t *, off_t *); 489 int tmpfs_chflags(struct vnode *, u_long, struct ucred *, struct thread *); 490 int tmpfs_chmod(struct vnode *, mode_t, struct ucred *, struct thread *); 491 int tmpfs_chown(struct vnode *, uid_t, gid_t, struct ucred *, 492 struct thread *); 493 int tmpfs_chsize(struct vnode *, u_quad_t, struct ucred *, struct thread *); 494 int tmpfs_chtimes(struct vnode *, struct vattr *, struct ucred *cred, 495 struct thread *); 496 void tmpfs_itimes(struct vnode *, const struct timespec *, 497 const struct timespec *); 498 499 void tmpfs_set_accessed(struct tmpfs_mount *tm, struct tmpfs_node *node); 500 void tmpfs_set_status(struct tmpfs_mount *tm, struct tmpfs_node *node, 501 int status); 502 int tmpfs_truncate(struct vnode *, off_t); 503 struct tmpfs_dirent *tmpfs_dir_first(struct tmpfs_node *dnode, 504 struct tmpfs_dir_cursor *dc); 505 struct tmpfs_dirent *tmpfs_dir_next(struct tmpfs_node *dnode, 506 struct tmpfs_dir_cursor *dc); 507 bool tmpfs_pages_check_avail(struct tmpfs_mount *tmp, size_t req_pages); 508 void tmpfs_extattr_free(struct tmpfs_extattr* ea); 509 static __inline void 510 tmpfs_update(struct vnode *vp) 511 { 512 513 tmpfs_itimes(vp, NULL, NULL); 514 } 515 516 /* 517 * Convenience macros to simplify some logical expressions. 518 */ 519 #define IMPLIES(a, b) (!(a) || (b)) 520 521 /* 522 * Checks that the directory entry pointed by 'de' matches the name 'name' 523 * with a length of 'len'. 524 */ 525 #define TMPFS_DIRENT_MATCHES(de, name, len) \ 526 (de->td_namelen == len && \ 527 bcmp((de)->ud.td_name, (name), (de)->td_namelen) == 0) 528 529 /* 530 * Ensures that the node pointed by 'node' is a directory and that its 531 * contents are consistent with respect to directories. 532 */ 533 #define TMPFS_VALIDATE_DIR(node) do { \ 534 MPASS((node)->tn_type == VDIR); \ 535 MPASS((node)->tn_size % sizeof(struct tmpfs_dirent) == 0); \ 536 } while (0) 537 538 /* 539 * Amount of memory pages to reserve for the system (e.g., to not use by 540 * tmpfs). 541 */ 542 #if !defined(TMPFS_PAGES_MINRESERVED) 543 #define TMPFS_PAGES_MINRESERVED (4 * 1024 * 1024 / PAGE_SIZE) 544 #endif 545 546 /* 547 * Percent of available memory + swap available to use by tmpfs file systems 548 * without a size limit. 549 */ 550 #if !defined(TMPFS_MEM_PERCENT) 551 #define TMPFS_MEM_PERCENT 95 552 #endif 553 554 /* 555 * Amount of memory to reserve for extended attributes. 556 */ 557 #if !defined(TMPFS_EA_MEMORY_RESERVED) 558 #define TMPFS_EA_MEMORY_RESERVED (16 * 1024 * 1024) 559 #endif 560 561 size_t tmpfs_mem_avail(void); 562 size_t tmpfs_pages_used(struct tmpfs_mount *tmp); 563 int tmpfs_subr_init(void); 564 void tmpfs_subr_uninit(void); 565 566 extern int tmpfs_pager_type; 567 568 /* 569 * Macros/functions to convert from generic data structures to tmpfs 570 * specific ones. 571 */ 572 573 static inline struct vnode * 574 VM_TO_TMPFS_VP(vm_object_t obj) 575 { 576 struct tmpfs_node *node; 577 578 if ((obj->flags & OBJ_TMPFS) == 0) 579 return (NULL); 580 581 /* 582 * swp_priv is the back-pointer to the tmpfs node, if any, 583 * which uses the vm object as backing store. The object 584 * handle is not used to avoid locking sw_alloc_sx on tmpfs 585 * node instantiation/destroy. 586 */ 587 node = obj->un_pager.swp.swp_priv; 588 return (node->tn_vnode); 589 } 590 591 static inline struct tmpfs_mount * 592 VM_TO_TMPFS_MP(vm_object_t obj) 593 { 594 struct tmpfs_node *node; 595 596 if ((obj->flags & OBJ_TMPFS) == 0) 597 return (NULL); 598 599 node = obj->un_pager.swp.swp_priv; 600 MPASS(node->tn_type == VREG); 601 return (node->tn_reg.tn_tmp); 602 } 603 604 static inline struct tmpfs_mount * 605 VFS_TO_TMPFS(struct mount *mp) 606 { 607 struct tmpfs_mount *tmp; 608 609 MPASS(mp != NULL && mp->mnt_data != NULL); 610 tmp = (struct tmpfs_mount *)mp->mnt_data; 611 return (tmp); 612 } 613 614 static inline struct tmpfs_node * 615 VP_TO_TMPFS_NODE(struct vnode *vp) 616 { 617 struct tmpfs_node *node; 618 619 MPASS(vp != NULL && vp->v_data != NULL); 620 node = (struct tmpfs_node *)vp->v_data; 621 return (node); 622 } 623 624 #define VP_TO_TMPFS_NODE_SMR(vp) \ 625 ((struct tmpfs_node *)vn_load_v_data_smr(vp)) 626 627 static inline struct tmpfs_node * 628 VP_TO_TMPFS_DIR(struct vnode *vp) 629 { 630 struct tmpfs_node *node; 631 632 node = VP_TO_TMPFS_NODE(vp); 633 TMPFS_VALIDATE_DIR(node); 634 return (node); 635 } 636 637 static inline bool 638 tmpfs_use_nc(struct vnode *vp) 639 { 640 641 return (!(VFS_TO_TMPFS(vp->v_mount)->tm_nonc)); 642 } 643 644 static inline void 645 tmpfs_update_getattr(struct vnode *vp) 646 { 647 struct tmpfs_node *node; 648 649 node = VP_TO_TMPFS_NODE(vp); 650 if (__predict_false((node->tn_status & (TMPFS_NODE_MODIFIED | 651 TMPFS_NODE_CHANGED)) != 0 || node->tn_accessed)) 652 tmpfs_update(vp); 653 } 654 655 extern struct fileops tmpfs_fnops; 656 657 #endif /* _KERNEL */ 658 659 #endif /* _FS_TMPFS_TMPFS_H_ */ 660