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; 295 296 /* 297 * Total size of whiteout directory entries. This 298 * must be a multiple of sizeof(struct tmpfs_dirent) 299 * and is used to determine whether a directory is 300 * empty (excluding whiteout entries) during rename/ 301 * rmdir operations. 302 */ 303 off_t tn_wht_size; /* (v) */ 304 } tn_dir; 305 306 /* Valid when tn_type == VLNK. */ 307 /* The link's target, allocated from a string pool. */ 308 struct tn_link { 309 char * tn_link_target; /* (c) */ 310 char tn_link_smr; /* (c) */ 311 } tn_link; 312 313 /* Valid when tn_type == VREG. */ 314 struct tn_reg { 315 /* 316 * The contents of regular files stored in a 317 * tmpfs file system are represented by a 318 * single anonymous memory object (aobj, for 319 * short). The aobj provides direct access to 320 * any position within the file. It is a task 321 * of the memory management subsystem to issue 322 * the required page ins or page outs whenever 323 * a position within the file is accessed. 324 */ 325 vm_object_t tn_aobj; /* (c) */ 326 struct tmpfs_mount *tn_tmp; /* (c) */ 327 vm_pindex_t tn_pages; /* (v) */ 328 } tn_reg; 329 } tn_spec; /* (v) */ 330 }; 331 LIST_HEAD(tmpfs_node_list, tmpfs_node); 332 333 #define tn_rdev tn_spec.tn_rdev 334 #define tn_dir tn_spec.tn_dir 335 #define tn_link_target tn_spec.tn_link.tn_link_target 336 #define tn_link_smr tn_spec.tn_link.tn_link_smr 337 #define tn_reg tn_spec.tn_reg 338 #define tn_fifo tn_spec.tn_fifo 339 340 #define TMPFS_LINK_MAX INT_MAX 341 342 #define TMPFS_NODE_LOCK(node) mtx_lock(&(node)->tn_interlock) 343 #define TMPFS_NODE_UNLOCK(node) mtx_unlock(&(node)->tn_interlock) 344 #define TMPFS_NODE_MTX(node) (&(node)->tn_interlock) 345 #define TMPFS_NODE_ASSERT_LOCKED(node) mtx_assert(TMPFS_NODE_MTX(node), \ 346 MA_OWNED) 347 348 #ifdef INVARIANTS 349 #define TMPFS_ASSERT_LOCKED(node) do { \ 350 MPASS((node) != NULL); \ 351 MPASS((node)->tn_vnode != NULL); \ 352 ASSERT_VOP_LOCKED((node)->tn_vnode, "tmpfs assert"); \ 353 } while (0) 354 #else 355 #define TMPFS_ASSERT_LOCKED(node) (void)0 356 #endif 357 358 /* tn_vpstate */ 359 #define TMPFS_VNODE_ALLOCATING 1 360 #define TMPFS_VNODE_WANT 2 361 #define TMPFS_VNODE_DOOMED 4 362 #define TMPFS_VNODE_WRECLAIM 8 363 364 /* tn_status */ 365 #define TMPFS_NODE_MODIFIED 0x01 366 #define TMPFS_NODE_CHANGED 0x02 367 368 /* 369 * Internal representation of a tmpfs mount point. 370 */ 371 struct tmpfs_mount { 372 /* 373 * Original value of the "size" parameter, for reference purposes, 374 * mostly. 375 */ 376 off_t tm_size_max; 377 /* 378 * Maximum number of memory pages available for use by the file 379 * system, set during mount time. This variable must never be 380 * used directly as it may be bigger than the current amount of 381 * free memory; in the extreme case, it will hold the ULONG_MAX 382 * value. 383 */ 384 u_long tm_pages_max; 385 386 /* Number of pages in use by the file system. */ 387 u_long tm_pages_used; 388 389 /* 390 * Pointer to the node representing the root directory of this 391 * file system. 392 */ 393 struct tmpfs_node * tm_root; 394 395 /* 396 * Maximum number of possible nodes for this file system; set 397 * during mount time. We need a hard limit on the maximum number 398 * of nodes to avoid allocating too much of them; their objects 399 * cannot be released until the file system is unmounted. 400 * Otherwise, we could easily run out of memory by creating lots 401 * of empty files and then simply removing them. 402 */ 403 ino_t tm_nodes_max; 404 405 /* unrhdr used to allocate inode numbers */ 406 struct unrhdr64 tm_ino_unr; 407 408 /* Number of nodes currently that are in use. */ 409 ino_t tm_nodes_inuse; 410 411 /* Memory used by extended attributes */ 412 uint64_t tm_ea_memory_inuse; 413 414 /* Maximum memory available for extended attributes */ 415 uint64_t tm_ea_memory_max; 416 417 /* Refcounter on this struct tmpfs_mount. */ 418 uint64_t tm_refcount; 419 420 /* maximum representable file size */ 421 u_int64_t tm_maxfilesize; 422 423 /* 424 * The used list contains all nodes that are currently used by 425 * the file system; i.e., they refer to existing files. 426 */ 427 struct tmpfs_node_list tm_nodes_used; 428 429 /* All node lock to protect the node list and tmp_pages_used. */ 430 struct mtx tm_allnode_lock; 431 432 /* Read-only status. */ 433 bool tm_ronly; 434 /* Do not use namecache. */ 435 bool tm_nonc; 436 /* Do not update mtime on writes through mmaped areas. */ 437 bool tm_nomtime; 438 439 /* Read from page cache directly. */ 440 bool tm_pgread; 441 }; 442 #define TMPFS_LOCK(tm) mtx_lock(&(tm)->tm_allnode_lock) 443 #define TMPFS_UNLOCK(tm) mtx_unlock(&(tm)->tm_allnode_lock) 444 #define TMPFS_MP_ASSERT_LOCKED(tm) mtx_assert(&(tm)->tm_allnode_lock, MA_OWNED) 445 446 /* 447 * This structure maps a file identifier to a tmpfs node. Used by the 448 * NFS code. 449 */ 450 struct tmpfs_fid_data { 451 ino_t tfd_id; 452 unsigned long tfd_gen; 453 }; 454 _Static_assert(sizeof(struct tmpfs_fid_data) <= MAXFIDSZ, 455 "(struct tmpfs_fid_data) is larger than (struct fid).fid_data"); 456 457 struct tmpfs_dir_cursor { 458 struct tmpfs_dirent *tdc_current; 459 struct tmpfs_dirent *tdc_tree; 460 }; 461 462 #ifdef _KERNEL 463 /* 464 * Prototypes for tmpfs_subr.c. 465 */ 466 467 void tmpfs_ref_node(struct tmpfs_node *node); 468 int tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount *, __enum_uint8(vtype), 469 uid_t uid, gid_t gid, mode_t mode, struct tmpfs_node *, 470 const char *, dev_t, struct tmpfs_node **); 471 int tmpfs_fo_close(struct file *fp, struct thread *td); 472 void tmpfs_free_node(struct tmpfs_mount *, struct tmpfs_node *); 473 bool tmpfs_free_node_locked(struct tmpfs_mount *, struct tmpfs_node *, bool); 474 void tmpfs_free_tmp(struct tmpfs_mount *); 475 int tmpfs_alloc_dirent(struct tmpfs_mount *, struct tmpfs_node *, 476 const char *, u_int, struct tmpfs_dirent **); 477 void tmpfs_free_dirent(struct tmpfs_mount *, struct tmpfs_dirent *); 478 void tmpfs_dirent_init(struct tmpfs_dirent *, const char *, u_int); 479 void tmpfs_destroy_vobject(struct vnode *vp, vm_object_t obj); 480 int tmpfs_alloc_vp(struct mount *, struct tmpfs_node *, int, 481 struct vnode **); 482 void tmpfs_free_vp(struct vnode *); 483 int tmpfs_alloc_file(struct vnode *, struct vnode **, struct vattr *, 484 struct componentname *, const char *); 485 void tmpfs_check_mtime(struct vnode *); 486 void tmpfs_dir_attach(struct vnode *, struct tmpfs_dirent *); 487 void tmpfs_dir_detach(struct vnode *, struct tmpfs_dirent *); 488 void tmpfs_dir_destroy(struct tmpfs_mount *, struct tmpfs_node *); 489 struct tmpfs_dirent * tmpfs_dir_lookup(struct tmpfs_node *node, 490 struct tmpfs_node *f, 491 struct componentname *cnp); 492 int tmpfs_dir_getdents(struct tmpfs_mount *, struct tmpfs_node *, 493 struct uio *, int, uint64_t *, int *); 494 int tmpfs_dir_whiteout_add(struct vnode *, struct componentname *); 495 void tmpfs_dir_whiteout_remove(struct vnode *, struct componentname *); 496 void tmpfs_dir_clear_whiteouts(struct vnode *); 497 int tmpfs_reg_resize(struct vnode *, off_t, boolean_t); 498 int tmpfs_reg_punch_hole(struct vnode *vp, off_t *, off_t *); 499 int tmpfs_chflags(struct vnode *, u_long, struct ucred *, struct thread *); 500 int tmpfs_chmod(struct vnode *, mode_t, struct ucred *, struct thread *); 501 int tmpfs_chown(struct vnode *, uid_t, gid_t, struct ucred *, 502 struct thread *); 503 int tmpfs_chsize(struct vnode *, u_quad_t, struct ucred *, struct thread *); 504 int tmpfs_chtimes(struct vnode *, struct vattr *, struct ucred *cred, 505 struct thread *); 506 void tmpfs_itimes(struct vnode *, const struct timespec *, 507 const struct timespec *); 508 509 void tmpfs_set_accessed(struct tmpfs_mount *tm, struct tmpfs_node *node); 510 void tmpfs_set_status(struct tmpfs_mount *tm, struct tmpfs_node *node, 511 int status); 512 int tmpfs_truncate(struct vnode *, off_t); 513 struct tmpfs_dirent *tmpfs_dir_first(struct tmpfs_node *dnode, 514 struct tmpfs_dir_cursor *dc); 515 struct tmpfs_dirent *tmpfs_dir_next(struct tmpfs_node *dnode, 516 struct tmpfs_dir_cursor *dc); 517 bool tmpfs_pages_check_avail(struct tmpfs_mount *tmp, size_t req_pages); 518 void tmpfs_extattr_free(struct tmpfs_extattr* ea); 519 static __inline void 520 tmpfs_update(struct vnode *vp) 521 { 522 523 tmpfs_itimes(vp, NULL, NULL); 524 } 525 526 /* 527 * Convenience macros to simplify some logical expressions. 528 */ 529 #define IMPLIES(a, b) (!(a) || (b)) 530 531 /* 532 * Checks that the directory entry pointed by 'de' matches the name 'name' 533 * with a length of 'len'. 534 */ 535 #define TMPFS_DIRENT_MATCHES(de, name, len) \ 536 (de->td_namelen == len && \ 537 bcmp((de)->ud.td_name, (name), (de)->td_namelen) == 0) 538 539 /* 540 * Ensures that the node pointed by 'node' is a directory and that its 541 * contents are consistent with respect to directories. 542 */ 543 #define TMPFS_VALIDATE_DIR(node) do { \ 544 MPASS((node)->tn_type == VDIR); \ 545 MPASS((node)->tn_size % sizeof(struct tmpfs_dirent) == 0); \ 546 MPASS((node)->tn_dir.tn_wht_size % sizeof(struct tmpfs_dirent) == 0); \ 547 MPASS((node)->tn_dir.tn_wht_size <= (node)->tn_size); \ 548 } while (0) 549 550 /* 551 * Amount of memory pages to reserve for the system (e.g., to not use by 552 * tmpfs). 553 */ 554 #if !defined(TMPFS_PAGES_MINRESERVED) 555 #define TMPFS_PAGES_MINRESERVED (4 * 1024 * 1024 / PAGE_SIZE) 556 #endif 557 558 /* 559 * Percent of available memory + swap available to use by tmpfs file systems 560 * without a size limit. 561 */ 562 #if !defined(TMPFS_MEM_PERCENT) 563 #define TMPFS_MEM_PERCENT 100 564 #endif 565 566 /* 567 * Amount of memory to reserve for extended attributes. 568 */ 569 #if !defined(TMPFS_EA_MEMORY_RESERVED) 570 #define TMPFS_EA_MEMORY_RESERVED (16 * 1024 * 1024) 571 #endif 572 573 size_t tmpfs_mem_avail(void); 574 size_t tmpfs_pages_used(struct tmpfs_mount *tmp); 575 int tmpfs_subr_init(void); 576 void tmpfs_subr_uninit(void); 577 578 extern int tmpfs_pager_type; 579 580 /* 581 * Macros/functions to convert from generic data structures to tmpfs 582 * specific ones. 583 */ 584 585 static inline struct vnode * 586 VM_TO_TMPFS_VP(vm_object_t obj) 587 { 588 struct tmpfs_node *node; 589 590 if ((obj->flags & OBJ_TMPFS) == 0) 591 return (NULL); 592 593 /* 594 * swp_priv is the back-pointer to the tmpfs node, if any, 595 * which uses the vm object as backing store. The object 596 * handle is not used to avoid locking sw_alloc_sx on tmpfs 597 * node instantiation/destroy. 598 */ 599 node = obj->un_pager.swp.swp_priv; 600 return (node->tn_vnode); 601 } 602 603 static inline struct tmpfs_mount * 604 VM_TO_TMPFS_MP(vm_object_t obj) 605 { 606 struct tmpfs_node *node; 607 608 if ((obj->flags & OBJ_TMPFS) == 0) 609 return (NULL); 610 611 node = obj->un_pager.swp.swp_priv; 612 MPASS(node->tn_type == VREG); 613 return (node->tn_reg.tn_tmp); 614 } 615 616 static inline struct tmpfs_mount * 617 VFS_TO_TMPFS(struct mount *mp) 618 { 619 struct tmpfs_mount *tmp; 620 621 MPASS(mp != NULL && mp->mnt_data != NULL); 622 tmp = (struct tmpfs_mount *)mp->mnt_data; 623 return (tmp); 624 } 625 626 static inline struct tmpfs_node * 627 VP_TO_TMPFS_NODE(struct vnode *vp) 628 { 629 struct tmpfs_node *node; 630 631 MPASS(vp != NULL && vp->v_data != NULL); 632 node = (struct tmpfs_node *)vp->v_data; 633 return (node); 634 } 635 636 #define VP_TO_TMPFS_NODE_SMR(vp) \ 637 ((struct tmpfs_node *)vn_load_v_data_smr(vp)) 638 639 static inline struct tmpfs_node * 640 VP_TO_TMPFS_DIR(struct vnode *vp) 641 { 642 struct tmpfs_node *node; 643 644 node = VP_TO_TMPFS_NODE(vp); 645 TMPFS_VALIDATE_DIR(node); 646 return (node); 647 } 648 649 static inline bool 650 tmpfs_use_nc(struct vnode *vp) 651 { 652 653 return (!(VFS_TO_TMPFS(vp->v_mount)->tm_nonc)); 654 } 655 656 static inline void 657 tmpfs_update_getattr(struct vnode *vp) 658 { 659 struct tmpfs_node *node; 660 661 node = VP_TO_TMPFS_NODE(vp); 662 if (__predict_false((node->tn_status & (TMPFS_NODE_MODIFIED | 663 TMPFS_NODE_CHANGED)) != 0 || node->tn_accessed)) 664 tmpfs_update(vp); 665 } 666 667 extern struct fileops tmpfs_fnops; 668 669 #endif /* _KERNEL */ 670 671 #endif /* _FS_TMPFS_TMPFS_H_ */ 672