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