Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/tmpfs/tmpfs_vfsops.c
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1 /* $NetBSD: tmpfs_vfsops.c,v 1.10 2005/12/11 12:24:29 christos Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD 5 * 6 * Copyright (c) 2005 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 /* 36 * Efficient memory file system. 37 * 38 * tmpfs is a file system that uses FreeBSD's virtual memory 39 * sub-system to store file data and metadata in an efficient way. 40 * This means that it does not follow the structure of an on-disk file 41 * system because it simply does not need to. Instead, it uses 42 * memory-specific data structures and algorithms to automatically 43 * allocate and release resources. 44 */ 45 46 #include "opt_ddb.h" 47 #include "opt_tmpfs.h" 48 49 #include <sys/cdefs.h> 50 __FBSDID("$FreeBSD$"); 51 52 #include <sys/param.h> 53 #include <sys/systm.h> 54 #include <sys/dirent.h> 55 #include <sys/file.h> 56 #include <sys/limits.h> 57 #include <sys/lock.h> 58 #include <sys/mount.h> 59 #include <sys/mutex.h> 60 #include <sys/proc.h> 61 #include <sys/jail.h> 62 #include <sys/kernel.h> 63 #include <sys/rwlock.h> 64 #include <sys/stat.h> 65 #include <sys/sx.h> 66 #include <sys/sysctl.h> 67 #include <sys/vnode.h> 68 69 #include <vm/vm.h> 70 #include <vm/vm_param.h> 71 #include <vm/pmap.h> 72 #include <vm/vm_extern.h> 73 #include <vm/vm_map.h> 74 #include <vm/vm_object.h> 75 #include <vm/vm_param.h> 76 77 #include <fs/tmpfs/tmpfs.h> 78 79 /* 80 * Default permission for root node 81 */ 82 #define TMPFS_DEFAULT_ROOT_MODE (S_IRWXU|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH) 83 84 static MALLOC_DEFINE(M_TMPFSMNT, "tmpfs mount", "tmpfs mount structures"); 85 MALLOC_DEFINE(M_TMPFSNAME, "tmpfs name", "tmpfs file names"); 86 87 static int tmpfs_mount(struct mount *); 88 static int tmpfs_unmount(struct mount *, int); 89 static int tmpfs_root(struct mount *, int flags, struct vnode **); 90 static int tmpfs_fhtovp(struct mount *, struct fid *, int, 91 struct vnode **); 92 static int tmpfs_statfs(struct mount *, struct statfs *); 93 94 static const char *tmpfs_opts[] = { 95 "from", "size", "maxfilesize", "inodes", "uid", "gid", "mode", "export", 96 "union", "nonc", "nomtime", NULL 97 }; 98 99 static const char *tmpfs_updateopts[] = { 100 "from", "export", "nomtime", "size", NULL 101 }; 102 103 static int 104 tmpfs_update_mtime_lazy_filter(struct vnode *vp, void *arg) 105 { 106 struct vm_object *obj; 107 108 if (vp->v_type != VREG) 109 return (0); 110 111 obj = atomic_load_ptr(&vp->v_object); 112 if (obj == NULL) 113 return (0); 114 115 return (vm_object_mightbedirty_(obj)); 116 } 117 118 static void 119 tmpfs_update_mtime_lazy(struct mount *mp) 120 { 121 struct vnode *vp, *mvp; 122 123 MNT_VNODE_FOREACH_LAZY(vp, mp, mvp, tmpfs_update_mtime_lazy_filter, NULL) { 124 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK) != 0) 125 continue; 126 tmpfs_check_mtime(vp); 127 vput(vp); 128 } 129 } 130 131 static void 132 tmpfs_update_mtime_all(struct mount *mp) 133 { 134 struct vnode *vp, *mvp; 135 136 if (VFS_TO_TMPFS(mp)->tm_nomtime) 137 return; 138 MNT_VNODE_FOREACH_ALL(vp, mp, mvp) { 139 if (vp->v_type != VREG) { 140 VI_UNLOCK(vp); 141 continue; 142 } 143 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK) != 0) 144 continue; 145 tmpfs_check_mtime(vp); 146 tmpfs_update(vp); 147 vput(vp); 148 } 149 } 150 151 struct tmpfs_check_rw_maps_arg { 152 bool found; 153 }; 154 155 static bool 156 tmpfs_check_rw_maps_cb(struct mount *mp __unused, vm_map_t map __unused, 157 vm_map_entry_t entry __unused, void *arg) 158 { 159 struct tmpfs_check_rw_maps_arg *a; 160 161 a = arg; 162 a->found = true; 163 return (true); 164 } 165 166 /* 167 * Revoke write permissions from all mappings of regular files 168 * belonging to the specified tmpfs mount. 169 */ 170 static bool 171 tmpfs_revoke_rw_maps_cb(struct mount *mp __unused, vm_map_t map, 172 vm_map_entry_t entry, void *arg __unused) 173 { 174 175 /* 176 * XXXKIB: might be invalidate the mapping 177 * instead ? The process is not going to be 178 * happy in any case. 179 */ 180 entry->max_protection &= ~VM_PROT_WRITE; 181 if ((entry->protection & VM_PROT_WRITE) != 0) { 182 entry->protection &= ~VM_PROT_WRITE; 183 pmap_protect(map->pmap, entry->start, entry->end, 184 entry->protection); 185 } 186 return (false); 187 } 188 189 static void 190 tmpfs_all_rw_maps(struct mount *mp, bool (*cb)(struct mount *mp, vm_map_t, 191 vm_map_entry_t, void *), void *cb_arg) 192 { 193 struct proc *p; 194 struct vmspace *vm; 195 vm_map_t map; 196 vm_map_entry_t entry; 197 vm_object_t object; 198 struct vnode *vp; 199 int gen; 200 bool terminate; 201 202 terminate = false; 203 sx_slock(&allproc_lock); 204 again: 205 gen = allproc_gen; 206 FOREACH_PROC_IN_SYSTEM(p) { 207 PROC_LOCK(p); 208 if (p->p_state != PRS_NORMAL || (p->p_flag & (P_INEXEC | 209 P_SYSTEM | P_WEXIT)) != 0) { 210 PROC_UNLOCK(p); 211 continue; 212 } 213 vm = vmspace_acquire_ref(p); 214 _PHOLD_LITE(p); 215 PROC_UNLOCK(p); 216 if (vm == NULL) { 217 PRELE(p); 218 continue; 219 } 220 sx_sunlock(&allproc_lock); 221 map = &vm->vm_map; 222 223 vm_map_lock(map); 224 if (map->busy) 225 vm_map_wait_busy(map); 226 VM_MAP_ENTRY_FOREACH(entry, map) { 227 if ((entry->eflags & (MAP_ENTRY_GUARD | 228 MAP_ENTRY_IS_SUB_MAP | MAP_ENTRY_COW)) != 0 || 229 (entry->max_protection & VM_PROT_WRITE) == 0) 230 continue; 231 object = entry->object.vm_object; 232 if (object == NULL || object->type != tmpfs_pager_type) 233 continue; 234 /* 235 * No need to dig into shadow chain, mapping 236 * of the object not at top is readonly. 237 */ 238 239 VM_OBJECT_RLOCK(object); 240 if (object->type == OBJT_DEAD) { 241 VM_OBJECT_RUNLOCK(object); 242 continue; 243 } 244 MPASS(object->ref_count > 1); 245 if ((object->flags & OBJ_TMPFS) == 0) { 246 VM_OBJECT_RUNLOCK(object); 247 continue; 248 } 249 vp = VM_TO_TMPFS_VP(object); 250 if (vp->v_mount != mp) { 251 VM_OBJECT_RUNLOCK(object); 252 continue; 253 } 254 255 terminate = cb(mp, map, entry, cb_arg); 256 VM_OBJECT_RUNLOCK(object); 257 if (terminate) 258 break; 259 } 260 vm_map_unlock(map); 261 262 vmspace_free(vm); 263 sx_slock(&allproc_lock); 264 PRELE(p); 265 if (terminate) 266 break; 267 } 268 if (!terminate && gen != allproc_gen) 269 goto again; 270 sx_sunlock(&allproc_lock); 271 } 272 273 static bool 274 tmpfs_check_rw_maps(struct mount *mp) 275 { 276 struct tmpfs_check_rw_maps_arg ca; 277 278 ca.found = false; 279 tmpfs_all_rw_maps(mp, tmpfs_check_rw_maps_cb, &ca); 280 return (ca.found); 281 } 282 283 static int 284 tmpfs_rw_to_ro(struct mount *mp) 285 { 286 int error, flags; 287 bool forced; 288 289 forced = (mp->mnt_flag & MNT_FORCE) != 0; 290 flags = WRITECLOSE | (forced ? FORCECLOSE : 0); 291 292 if ((error = vn_start_write(NULL, &mp, V_WAIT)) != 0) 293 return (error); 294 error = vfs_write_suspend_umnt(mp); 295 if (error != 0) 296 return (error); 297 if (!forced && tmpfs_check_rw_maps(mp)) { 298 error = EBUSY; 299 goto out; 300 } 301 VFS_TO_TMPFS(mp)->tm_ronly = 1; 302 MNT_ILOCK(mp); 303 mp->mnt_flag |= MNT_RDONLY; 304 MNT_IUNLOCK(mp); 305 for (;;) { 306 tmpfs_all_rw_maps(mp, tmpfs_revoke_rw_maps_cb, NULL); 307 tmpfs_update_mtime_all(mp); 308 error = vflush(mp, 0, flags, curthread); 309 if (error != 0) { 310 VFS_TO_TMPFS(mp)->tm_ronly = 0; 311 MNT_ILOCK(mp); 312 mp->mnt_flag &= ~MNT_RDONLY; 313 MNT_IUNLOCK(mp); 314 goto out; 315 } 316 if (!tmpfs_check_rw_maps(mp)) 317 break; 318 } 319 out: 320 vfs_write_resume(mp, 0); 321 return (error); 322 } 323 324 static int 325 tmpfs_mount(struct mount *mp) 326 { 327 const size_t nodes_per_page = howmany(PAGE_SIZE, 328 sizeof(struct tmpfs_dirent) + sizeof(struct tmpfs_node)); 329 struct tmpfs_mount *tmp; 330 struct tmpfs_node *root; 331 int error; 332 bool nomtime, nonc; 333 /* Size counters. */ 334 u_quad_t pages; 335 off_t nodes_max, size_max, maxfilesize; 336 337 /* Root node attributes. */ 338 uid_t root_uid; 339 gid_t root_gid; 340 mode_t root_mode; 341 342 struct vattr va; 343 344 if (vfs_filteropt(mp->mnt_optnew, tmpfs_opts)) 345 return (EINVAL); 346 347 if (mp->mnt_flag & MNT_UPDATE) { 348 /* Only support update mounts for certain options. */ 349 if (vfs_filteropt(mp->mnt_optnew, tmpfs_updateopts) != 0) 350 return (EOPNOTSUPP); 351 tmp = VFS_TO_TMPFS(mp); 352 if (vfs_getopt_size(mp->mnt_optnew, "size", &size_max) == 0) { 353 /* 354 * On-the-fly resizing is not supported (yet). We still 355 * need to have "size" listed as "supported", otherwise 356 * trying to update fs that is listed in fstab with size 357 * parameter, say trying to change rw to ro or vice 358 * versa, would cause vfs_filteropt() to bail. 359 */ 360 if (size_max != tmp->tm_size_max) 361 return (EOPNOTSUPP); 362 } 363 if (vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0) && 364 !tmp->tm_ronly) { 365 /* RW -> RO */ 366 return (tmpfs_rw_to_ro(mp)); 367 } else if (!vfs_flagopt(mp->mnt_optnew, "ro", NULL, 0) && 368 tmp->tm_ronly) { 369 /* RO -> RW */ 370 tmp->tm_ronly = 0; 371 MNT_ILOCK(mp); 372 mp->mnt_flag &= ~MNT_RDONLY; 373 MNT_IUNLOCK(mp); 374 } 375 tmp->tm_nomtime = vfs_getopt(mp->mnt_optnew, "nomtime", NULL, 376 0) == 0; 377 MNT_ILOCK(mp); 378 if ((mp->mnt_flag & MNT_UNION) == 0) { 379 mp->mnt_kern_flag |= MNTK_FPLOOKUP; 380 } else { 381 mp->mnt_kern_flag &= ~MNTK_FPLOOKUP; 382 } 383 MNT_IUNLOCK(mp); 384 return (0); 385 } 386 387 vn_lock(mp->mnt_vnodecovered, LK_SHARED | LK_RETRY); 388 error = VOP_GETATTR(mp->mnt_vnodecovered, &va, mp->mnt_cred); 389 VOP_UNLOCK(mp->mnt_vnodecovered); 390 if (error) 391 return (error); 392 393 if (mp->mnt_cred->cr_ruid != 0 || 394 vfs_scanopt(mp->mnt_optnew, "gid", "%d", &root_gid) != 1) 395 root_gid = va.va_gid; 396 if (mp->mnt_cred->cr_ruid != 0 || 397 vfs_scanopt(mp->mnt_optnew, "uid", "%d", &root_uid) != 1) 398 root_uid = va.va_uid; 399 if (mp->mnt_cred->cr_ruid != 0 || 400 vfs_scanopt(mp->mnt_optnew, "mode", "%ho", &root_mode) != 1) 401 root_mode = va.va_mode; 402 if (vfs_getopt_size(mp->mnt_optnew, "inodes", &nodes_max) != 0) 403 nodes_max = 0; 404 if (vfs_getopt_size(mp->mnt_optnew, "size", &size_max) != 0) 405 size_max = 0; 406 if (vfs_getopt_size(mp->mnt_optnew, "maxfilesize", &maxfilesize) != 0) 407 maxfilesize = 0; 408 nonc = vfs_getopt(mp->mnt_optnew, "nonc", NULL, NULL) == 0; 409 nomtime = vfs_getopt(mp->mnt_optnew, "nomtime", NULL, NULL) == 0; 410 411 /* Do not allow mounts if we do not have enough memory to preserve 412 * the minimum reserved pages. */ 413 if (tmpfs_mem_avail() < TMPFS_PAGES_MINRESERVED) 414 return (ENOSPC); 415 416 /* Get the maximum number of memory pages this file system is 417 * allowed to use, based on the maximum size the user passed in 418 * the mount structure. A value of zero is treated as if the 419 * maximum available space was requested. */ 420 if (size_max == 0 || size_max > OFF_MAX - PAGE_SIZE || 421 (SIZE_MAX < OFF_MAX && size_max / PAGE_SIZE >= SIZE_MAX)) 422 pages = SIZE_MAX; 423 else { 424 size_max = roundup(size_max, PAGE_SIZE); 425 pages = howmany(size_max, PAGE_SIZE); 426 } 427 MPASS(pages > 0); 428 429 if (nodes_max <= 3) { 430 if (pages < INT_MAX / nodes_per_page) 431 nodes_max = pages * nodes_per_page; 432 else 433 nodes_max = INT_MAX; 434 } 435 if (nodes_max > INT_MAX) 436 nodes_max = INT_MAX; 437 MPASS(nodes_max >= 3); 438 439 /* Allocate the tmpfs mount structure and fill it. */ 440 tmp = (struct tmpfs_mount *)malloc(sizeof(struct tmpfs_mount), 441 M_TMPFSMNT, M_WAITOK | M_ZERO); 442 443 mtx_init(&tmp->tm_allnode_lock, "tmpfs allnode lock", NULL, MTX_DEF); 444 tmp->tm_nodes_max = nodes_max; 445 tmp->tm_nodes_inuse = 0; 446 tmp->tm_refcount = 1; 447 tmp->tm_maxfilesize = maxfilesize > 0 ? maxfilesize : OFF_MAX; 448 LIST_INIT(&tmp->tm_nodes_used); 449 450 tmp->tm_size_max = size_max; 451 tmp->tm_pages_max = pages; 452 tmp->tm_pages_used = 0; 453 new_unrhdr64(&tmp->tm_ino_unr, 2); 454 tmp->tm_ronly = (mp->mnt_flag & MNT_RDONLY) != 0; 455 tmp->tm_nonc = nonc; 456 tmp->tm_nomtime = nomtime; 457 458 /* Allocate the root node. */ 459 error = tmpfs_alloc_node(mp, tmp, VDIR, root_uid, root_gid, 460 root_mode & ALLPERMS, NULL, NULL, VNOVAL, &root); 461 462 if (error != 0 || root == NULL) { 463 free(tmp, M_TMPFSMNT); 464 return (error); 465 } 466 KASSERT(root->tn_id == 2, 467 ("tmpfs root with invalid ino: %ju", (uintmax_t)root->tn_id)); 468 tmp->tm_root = root; 469 470 MNT_ILOCK(mp); 471 mp->mnt_flag |= MNT_LOCAL; 472 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED | 473 MNTK_NOMSYNC; 474 if (!nonc && (mp->mnt_flag & MNT_UNION) == 0) 475 mp->mnt_kern_flag |= MNTK_FPLOOKUP; 476 MNT_IUNLOCK(mp); 477 478 mp->mnt_data = tmp; 479 mp->mnt_stat.f_namemax = MAXNAMLEN; 480 vfs_getnewfsid(mp); 481 vfs_mountedfrom(mp, "tmpfs"); 482 483 return (0); 484 } 485 486 /* ARGSUSED2 */ 487 static int 488 tmpfs_unmount(struct mount *mp, int mntflags) 489 { 490 struct tmpfs_mount *tmp; 491 struct tmpfs_node *node; 492 int error, flags; 493 494 flags = (mntflags & MNT_FORCE) != 0 ? FORCECLOSE : 0; 495 tmp = VFS_TO_TMPFS(mp); 496 497 /* Stop writers */ 498 error = vfs_write_suspend_umnt(mp); 499 if (error != 0) 500 return (error); 501 /* 502 * At this point, nodes cannot be destroyed by any other 503 * thread because write suspension is started. 504 */ 505 506 for (;;) { 507 error = vflush(mp, 0, flags, curthread); 508 if (error != 0) { 509 vfs_write_resume(mp, VR_START_WRITE); 510 return (error); 511 } 512 MNT_ILOCK(mp); 513 if (mp->mnt_nvnodelistsize == 0) { 514 MNT_IUNLOCK(mp); 515 break; 516 } 517 MNT_IUNLOCK(mp); 518 if ((mntflags & MNT_FORCE) == 0) { 519 vfs_write_resume(mp, VR_START_WRITE); 520 return (EBUSY); 521 } 522 } 523 524 TMPFS_LOCK(tmp); 525 while ((node = LIST_FIRST(&tmp->tm_nodes_used)) != NULL) { 526 TMPFS_NODE_LOCK(node); 527 if (node->tn_type == VDIR) 528 tmpfs_dir_destroy(tmp, node); 529 if (tmpfs_free_node_locked(tmp, node, true)) 530 TMPFS_LOCK(tmp); 531 else 532 TMPFS_NODE_UNLOCK(node); 533 } 534 535 mp->mnt_data = NULL; 536 tmpfs_free_tmp(tmp); 537 vfs_write_resume(mp, VR_START_WRITE); 538 539 return (0); 540 } 541 542 void 543 tmpfs_free_tmp(struct tmpfs_mount *tmp) 544 { 545 TMPFS_MP_ASSERT_LOCKED(tmp); 546 MPASS(tmp->tm_refcount > 0); 547 548 tmp->tm_refcount--; 549 if (tmp->tm_refcount > 0) { 550 TMPFS_UNLOCK(tmp); 551 return; 552 } 553 TMPFS_UNLOCK(tmp); 554 555 mtx_destroy(&tmp->tm_allnode_lock); 556 /* 557 * We cannot assert that tmp->tm_pages_used == 0 there, 558 * because tmpfs vm_objects might be still mapped by some 559 * process and outlive the mount due to reference counting. 560 */ 561 MPASS(tmp->tm_nodes_inuse == 0); 562 563 free(tmp, M_TMPFSMNT); 564 } 565 566 static int 567 tmpfs_root(struct mount *mp, int flags, struct vnode **vpp) 568 { 569 int error; 570 571 error = tmpfs_alloc_vp(mp, VFS_TO_TMPFS(mp)->tm_root, flags, vpp); 572 if (error == 0) 573 (*vpp)->v_vflag |= VV_ROOT; 574 return (error); 575 } 576 577 static int 578 tmpfs_fhtovp(struct mount *mp, struct fid *fhp, int flags, 579 struct vnode **vpp) 580 { 581 struct tmpfs_fid_data tfd; 582 struct tmpfs_mount *tmp; 583 struct tmpfs_node *node; 584 int error; 585 586 if (fhp->fid_len != sizeof(tfd)) 587 return (EINVAL); 588 589 /* 590 * Copy from fid_data onto the stack to avoid unaligned pointer use. 591 * See the comment in sys/mount.h on struct fid for details. 592 */ 593 memcpy(&tfd, fhp->fid_data, fhp->fid_len); 594 595 tmp = VFS_TO_TMPFS(mp); 596 597 if (tfd.tfd_id >= tmp->tm_nodes_max) 598 return (EINVAL); 599 600 TMPFS_LOCK(tmp); 601 LIST_FOREACH(node, &tmp->tm_nodes_used, tn_entries) { 602 if (node->tn_id == tfd.tfd_id && 603 node->tn_gen == tfd.tfd_gen) { 604 tmpfs_ref_node(node); 605 break; 606 } 607 } 608 TMPFS_UNLOCK(tmp); 609 610 if (node != NULL) { 611 error = tmpfs_alloc_vp(mp, node, LK_EXCLUSIVE, vpp); 612 tmpfs_free_node(tmp, node); 613 } else 614 error = EINVAL; 615 return (error); 616 } 617 618 /* ARGSUSED2 */ 619 static int 620 tmpfs_statfs(struct mount *mp, struct statfs *sbp) 621 { 622 struct tmpfs_mount *tmp; 623 size_t used; 624 625 tmp = VFS_TO_TMPFS(mp); 626 627 sbp->f_iosize = PAGE_SIZE; 628 sbp->f_bsize = PAGE_SIZE; 629 630 used = tmpfs_pages_used(tmp); 631 if (tmp->tm_pages_max != ULONG_MAX) 632 sbp->f_blocks = tmp->tm_pages_max; 633 else 634 sbp->f_blocks = used + tmpfs_mem_avail(); 635 if (sbp->f_blocks <= used) 636 sbp->f_bavail = 0; 637 else 638 sbp->f_bavail = sbp->f_blocks - used; 639 sbp->f_bfree = sbp->f_bavail; 640 used = tmp->tm_nodes_inuse; 641 sbp->f_files = tmp->tm_nodes_max; 642 if (sbp->f_files <= used) 643 sbp->f_ffree = 0; 644 else 645 sbp->f_ffree = sbp->f_files - used; 646 /* sbp->f_owner = tmp->tn_uid; */ 647 648 return (0); 649 } 650 651 static int 652 tmpfs_sync(struct mount *mp, int waitfor) 653 { 654 655 if (waitfor == MNT_SUSPEND) { 656 MNT_ILOCK(mp); 657 mp->mnt_kern_flag |= MNTK_SUSPEND2 | MNTK_SUSPENDED; 658 MNT_IUNLOCK(mp); 659 } else if (waitfor == MNT_LAZY) { 660 tmpfs_update_mtime_lazy(mp); 661 } 662 return (0); 663 } 664 665 static int 666 tmpfs_init(struct vfsconf *conf) 667 { 668 int res; 669 670 res = tmpfs_subr_init(); 671 if (res != 0) 672 return (res); 673 memcpy(&tmpfs_fnops, &vnops, sizeof(struct fileops)); 674 tmpfs_fnops.fo_close = tmpfs_fo_close; 675 return (0); 676 } 677 678 static int 679 tmpfs_uninit(struct vfsconf *conf) 680 { 681 tmpfs_subr_uninit(); 682 return (0); 683 } 684 685 /* 686 * tmpfs vfs operations. 687 */ 688 struct vfsops tmpfs_vfsops = { 689 .vfs_mount = tmpfs_mount, 690 .vfs_unmount = tmpfs_unmount, 691 .vfs_root = vfs_cache_root, 692 .vfs_cachedroot = tmpfs_root, 693 .vfs_statfs = tmpfs_statfs, 694 .vfs_fhtovp = tmpfs_fhtovp, 695 .vfs_sync = tmpfs_sync, 696 .vfs_init = tmpfs_init, 697 .vfs_uninit = tmpfs_uninit, 698 }; 699 VFS_SET(tmpfs_vfsops, tmpfs, VFCF_JAIL); 700 701 #ifdef DDB 702 #include <ddb/ddb.h> 703 704 static void 705 db_print_tmpfs(struct mount *mp, struct tmpfs_mount *tmp) 706 { 707 db_printf("mp %p (%s) tmp %p\n", mp, 708 mp->mnt_stat.f_mntonname, tmp); 709 db_printf( 710 "\tsize max %ju pages max %lu pages used %lu\n" 711 "\tinodes max %ju inodes inuse %ju refcount %ju\n" 712 "\tmaxfilesize %ju r%c %snamecache %smtime\n", 713 (uintmax_t)tmp->tm_size_max, tmp->tm_pages_max, tmp->tm_pages_used, 714 (uintmax_t)tmp->tm_nodes_max, (uintmax_t)tmp->tm_nodes_inuse, 715 (uintmax_t)tmp->tm_refcount, (uintmax_t)tmp->tm_maxfilesize, 716 tmp->tm_ronly ? 'o' : 'w', tmp->tm_nonc ? "no" : "", 717 tmp->tm_nomtime ? "no" : ""); 718 } 719 720 DB_SHOW_COMMAND(tmpfs, db_show_tmpfs) 721 { 722 struct mount *mp; 723 struct tmpfs_mount *tmp; 724 725 if (have_addr) { 726 mp = (struct mount *)addr; 727 tmp = VFS_TO_TMPFS(mp); 728 db_print_tmpfs(mp, tmp); 729 return; 730 } 731 732 TAILQ_FOREACH(mp, &mountlist, mnt_list) { 733 if (strcmp(mp->mnt_stat.f_fstypename, tmpfs_vfsconf.vfc_name) == 734 0) { 735 tmp = VFS_TO_TMPFS(mp); 736 db_print_tmpfs(mp, tmp); 737 } 738 } 739 } 740 #endif /* DDB */
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