| 1 | /* $NetBSD: vfs_init.c,v 1.48 2015/05/06 15:57:08 hannken Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1998, 2000, 2008 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, |
| 9 | * NASA Ames Research Center. |
| 10 | * |
| 11 | * Redistribution and use in source and binary forms, with or without |
| 12 | * modification, are permitted provided that the following conditions |
| 13 | * are met: |
| 14 | * 1. Redistributions of source code must retain the above copyright |
| 15 | * notice, this list of conditions and the following disclaimer. |
| 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer in the |
| 18 | * documentation and/or other materials provided with the distribution. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 21 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 22 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 23 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 24 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 25 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 26 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 29 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 30 | * POSSIBILITY OF SUCH DAMAGE. |
| 31 | */ |
| 32 | |
| 33 | /* |
| 34 | * Copyright (c) 1989, 1993 |
| 35 | * The Regents of the University of California. All rights reserved. |
| 36 | * |
| 37 | * This code is derived from software contributed |
| 38 | * to Berkeley by John Heidemann of the UCLA Ficus project. |
| 39 | * |
| 40 | * Source: * @(#)i405_init.c 2.10 92/04/27 UCLA Ficus project |
| 41 | * |
| 42 | * Redistribution and use in source and binary forms, with or without |
| 43 | * modification, are permitted provided that the following conditions |
| 44 | * are met: |
| 45 | * 1. Redistributions of source code must retain the above copyright |
| 46 | * notice, this list of conditions and the following disclaimer. |
| 47 | * 2. Redistributions in binary form must reproduce the above copyright |
| 48 | * notice, this list of conditions and the following disclaimer in the |
| 49 | * documentation and/or other materials provided with the distribution. |
| 50 | * 3. Neither the name of the University nor the names of its contributors |
| 51 | * may be used to endorse or promote products derived from this software |
| 52 | * without specific prior written permission. |
| 53 | * |
| 54 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 55 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 56 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 57 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 58 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 59 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 60 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 61 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 62 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 63 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 64 | * SUCH DAMAGE. |
| 65 | * |
| 66 | * @(#)vfs_init.c 8.5 (Berkeley) 5/11/95 |
| 67 | */ |
| 68 | |
| 69 | #include <sys/cdefs.h> |
| 70 | __KERNEL_RCSID(0, "$NetBSD: vfs_init.c,v 1.48 2015/05/06 15:57:08 hannken Exp $" ); |
| 71 | |
| 72 | #include <sys/param.h> |
| 73 | #include <sys/mount.h> |
| 74 | #include <sys/time.h> |
| 75 | #include <sys/vnode.h> |
| 76 | #include <sys/stat.h> |
| 77 | #include <sys/namei.h> |
| 78 | #include <sys/ucred.h> |
| 79 | #include <sys/buf.h> |
| 80 | #include <sys/errno.h> |
| 81 | #include <sys/kmem.h> |
| 82 | #include <sys/systm.h> |
| 83 | #include <sys/module.h> |
| 84 | #include <sys/dirhash.h> |
| 85 | #include <sys/sysctl.h> |
| 86 | #include <sys/kauth.h> |
| 87 | |
| 88 | /* |
| 89 | * Sigh, such primitive tools are these... |
| 90 | */ |
| 91 | #if 0 |
| 92 | #define DODEBUG(A) A |
| 93 | #else |
| 94 | #define DODEBUG(A) |
| 95 | #endif |
| 96 | |
| 97 | /* |
| 98 | * The global list of vnode operations. |
| 99 | */ |
| 100 | extern const struct vnodeop_desc * const vfs_op_descs[]; |
| 101 | |
| 102 | /* |
| 103 | * These vnodeopv_descs are listed here because they are not |
| 104 | * associated with any particular file system, and thus cannot |
| 105 | * be initialized by vfs_attach(). |
| 106 | */ |
| 107 | extern const struct vnodeopv_desc dead_vnodeop_opv_desc; |
| 108 | extern const struct vnodeopv_desc fifo_vnodeop_opv_desc; |
| 109 | extern const struct vnodeopv_desc spec_vnodeop_opv_desc; |
| 110 | |
| 111 | const struct vnodeopv_desc * const vfs_special_vnodeopv_descs[] = { |
| 112 | &dead_vnodeop_opv_desc, |
| 113 | &fifo_vnodeop_opv_desc, |
| 114 | &spec_vnodeop_opv_desc, |
| 115 | NULL, |
| 116 | }; |
| 117 | |
| 118 | struct vfs_list_head vfs_list = /* vfs list */ |
| 119 | LIST_HEAD_INITIALIZER(vfs_list); |
| 120 | |
| 121 | static kauth_listener_t mount_listener; |
| 122 | |
| 123 | /* |
| 124 | * This code doesn't work if the defn is **vnodop_defns with cc. |
| 125 | * The problem is because of the compiler sometimes putting in an |
| 126 | * extra level of indirection for arrays. It's an interesting |
| 127 | * "feature" of C. |
| 128 | */ |
| 129 | typedef int (*PFI)(void *); |
| 130 | |
| 131 | /* |
| 132 | * A miscellaneous routine. |
| 133 | * A generic "default" routine that just returns an error. |
| 134 | */ |
| 135 | /*ARGSUSED*/ |
| 136 | int |
| 137 | vn_default_error(void *v) |
| 138 | { |
| 139 | |
| 140 | return (EOPNOTSUPP); |
| 141 | } |
| 142 | |
| 143 | static struct sysctllog *vfs_sysctllog; |
| 144 | |
| 145 | /* |
| 146 | * Top level filesystem related information gathering. |
| 147 | */ |
| 148 | static void |
| 149 | sysctl_vfs_setup(void) |
| 150 | { |
| 151 | extern int vfs_magiclinks; |
| 152 | |
| 153 | sysctl_createv(&vfs_sysctllog, 0, NULL, NULL, |
| 154 | CTLFLAG_PERMANENT, |
| 155 | CTLTYPE_NODE, "generic" , |
| 156 | SYSCTL_DESCR("Non-specific vfs related information" ), |
| 157 | NULL, 0, NULL, 0, |
| 158 | CTL_VFS, VFS_GENERIC, CTL_EOL); |
| 159 | sysctl_createv(&vfs_sysctllog, 0, NULL, NULL, |
| 160 | CTLFLAG_PERMANENT, |
| 161 | CTLTYPE_STRING, "fstypes" , |
| 162 | SYSCTL_DESCR("List of file systems present" ), |
| 163 | sysctl_vfs_generic_fstypes, 0, NULL, 0, |
| 164 | CTL_VFS, VFS_GENERIC, CTL_CREATE, CTL_EOL); |
| 165 | sysctl_createv(&vfs_sysctllog, 0, NULL, NULL, |
| 166 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 167 | CTLTYPE_INT, "magiclinks" , |
| 168 | SYSCTL_DESCR("Whether \"magic\" symlinks are expanded" ), |
| 169 | NULL, 0, &vfs_magiclinks, 0, |
| 170 | CTL_VFS, VFS_GENERIC, VFS_MAGICLINKS, CTL_EOL); |
| 171 | } |
| 172 | |
| 173 | |
| 174 | /* |
| 175 | * vfs_init.c |
| 176 | * |
| 177 | * Allocate and fill in operations vectors. |
| 178 | * |
| 179 | * An undocumented feature of this approach to defining operations is that |
| 180 | * there can be multiple entries in vfs_opv_descs for the same operations |
| 181 | * vector. This allows third parties to extend the set of operations |
| 182 | * supported by another layer in a binary compatibile way. For example, |
| 183 | * assume that NFS needed to be modified to support Ficus. NFS has an entry |
| 184 | * (probably nfs_vnopdeop_decls) declaring all the operations NFS supports by |
| 185 | * default. Ficus could add another entry (ficus_nfs_vnodeop_decl_entensions) |
| 186 | * listing those new operations Ficus adds to NFS, all without modifying the |
| 187 | * NFS code. (Of couse, the OTW NFS protocol still needs to be munged, but |
| 188 | * that is a(whole)nother story.) This is a feature. |
| 189 | */ |
| 190 | |
| 191 | /* |
| 192 | * Init the vector, if it needs it. |
| 193 | * Also handle backwards compatibility. |
| 194 | */ |
| 195 | static void |
| 196 | vfs_opv_init_explicit(const struct vnodeopv_desc *vfs_opv_desc) |
| 197 | { |
| 198 | int (**opv_desc_vector)(void *); |
| 199 | const struct vnodeopv_entry_desc *opve_descp; |
| 200 | |
| 201 | opv_desc_vector = *(vfs_opv_desc->opv_desc_vector_p); |
| 202 | |
| 203 | for (opve_descp = vfs_opv_desc->opv_desc_ops; |
| 204 | opve_descp->opve_op; |
| 205 | opve_descp++) { |
| 206 | /* |
| 207 | * Sanity check: is this operation listed |
| 208 | * in the list of operations? We check this |
| 209 | * by seeing if its offset is zero. Since |
| 210 | * the default routine should always be listed |
| 211 | * first, it should be the only one with a zero |
| 212 | * offset. Any other operation with a zero |
| 213 | * offset is probably not listed in |
| 214 | * vfs_op_descs, and so is probably an error. |
| 215 | * |
| 216 | * A panic here means the layer programmer |
| 217 | * has committed the all-too common bug |
| 218 | * of adding a new operation to the layer's |
| 219 | * list of vnode operations but |
| 220 | * not adding the operation to the system-wide |
| 221 | * list of supported operations. |
| 222 | */ |
| 223 | if (opve_descp->opve_op->vdesc_offset == 0 && |
| 224 | opve_descp->opve_op->vdesc_offset != VOFFSET(vop_default)) { |
| 225 | printf("operation %s not listed in %s.\n" , |
| 226 | opve_descp->opve_op->vdesc_name, "vfs_op_descs" ); |
| 227 | panic ("vfs_opv_init: bad operation" ); |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Fill in this entry. |
| 232 | */ |
| 233 | opv_desc_vector[opve_descp->opve_op->vdesc_offset] = |
| 234 | opve_descp->opve_impl; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | static void |
| 239 | vfs_opv_init_default(const struct vnodeopv_desc *vfs_opv_desc) |
| 240 | { |
| 241 | int j; |
| 242 | int (**opv_desc_vector)(void *); |
| 243 | |
| 244 | opv_desc_vector = *(vfs_opv_desc->opv_desc_vector_p); |
| 245 | |
| 246 | /* |
| 247 | * Force every operations vector to have a default routine. |
| 248 | */ |
| 249 | if (opv_desc_vector[VOFFSET(vop_default)] == NULL) |
| 250 | panic("vfs_opv_init: operation vector without default routine." ); |
| 251 | |
| 252 | for (j = 0; j < VNODE_OPS_COUNT; j++) |
| 253 | if (opv_desc_vector[j] == NULL) |
| 254 | opv_desc_vector[j] = |
| 255 | opv_desc_vector[VOFFSET(vop_default)]; |
| 256 | } |
| 257 | |
| 258 | void |
| 259 | vfs_opv_init(const struct vnodeopv_desc * const *vopvdpp) |
| 260 | { |
| 261 | int (**opv_desc_vector)(void *); |
| 262 | int i; |
| 263 | |
| 264 | /* |
| 265 | * Allocate the vectors. |
| 266 | */ |
| 267 | for (i = 0; vopvdpp[i] != NULL; i++) { |
| 268 | opv_desc_vector = |
| 269 | kmem_alloc(VNODE_OPS_COUNT * sizeof(PFI), KM_SLEEP); |
| 270 | memset(opv_desc_vector, 0, VNODE_OPS_COUNT * sizeof(PFI)); |
| 271 | *(vopvdpp[i]->opv_desc_vector_p) = opv_desc_vector; |
| 272 | DODEBUG(printf("vector at %p allocated\n" , |
| 273 | opv_desc_vector_p)); |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * ...and fill them in. |
| 278 | */ |
| 279 | for (i = 0; vopvdpp[i] != NULL; i++) |
| 280 | vfs_opv_init_explicit(vopvdpp[i]); |
| 281 | |
| 282 | /* |
| 283 | * Finally, go back and replace unfilled routines |
| 284 | * with their default. |
| 285 | */ |
| 286 | for (i = 0; vopvdpp[i] != NULL; i++) |
| 287 | vfs_opv_init_default(vopvdpp[i]); |
| 288 | } |
| 289 | |
| 290 | void |
| 291 | vfs_opv_free(const struct vnodeopv_desc * const *vopvdpp) |
| 292 | { |
| 293 | int i; |
| 294 | |
| 295 | /* |
| 296 | * Free the vectors allocated in vfs_opv_init(). |
| 297 | */ |
| 298 | for (i = 0; vopvdpp[i] != NULL; i++) { |
| 299 | kmem_free(*(vopvdpp[i]->opv_desc_vector_p), |
| 300 | VNODE_OPS_COUNT * sizeof(PFI)); |
| 301 | *(vopvdpp[i]->opv_desc_vector_p) = NULL; |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | #ifdef DEBUG |
| 306 | static void |
| 307 | vfs_op_check(void) |
| 308 | { |
| 309 | int i; |
| 310 | |
| 311 | DODEBUG(printf("Vnode_interface_init.\n" )); |
| 312 | |
| 313 | /* |
| 314 | * Check offset of each op. |
| 315 | */ |
| 316 | for (i = 0; vfs_op_descs[i]; i++) { |
| 317 | if (vfs_op_descs[i]->vdesc_offset != i) |
| 318 | panic("vfs_op_check: vfs_op_desc[] offset mismatch" ); |
| 319 | } |
| 320 | |
| 321 | if (i != VNODE_OPS_COUNT) { |
| 322 | panic("vfs_op_check: vnode ops count mismatch (%d != %d)" , |
| 323 | i, VNODE_OPS_COUNT); |
| 324 | } |
| 325 | |
| 326 | DODEBUG(printf ("vfs_opv_numops=%d\n" , VNODE_OPS_COUNT)); |
| 327 | } |
| 328 | #endif /* DEBUG */ |
| 329 | |
| 330 | /* |
| 331 | * Common routine to check if an unprivileged mount is allowed. |
| 332 | * |
| 333 | * We export just this part (i.e., without the access control) so that if a |
| 334 | * secmodel wants to implement finer grained user mounts it can do so without |
| 335 | * copying too much code. More elaborate policies (i.e., specific users allowed |
| 336 | * to also create devices and/or introduce set-id binaries, or export |
| 337 | * file-systems) will require a different implementation. |
| 338 | * |
| 339 | * This routine is intended to be called from listener context, and as such |
| 340 | * does not take credentials as an argument. |
| 341 | */ |
| 342 | int |
| 343 | usermount_common_policy(struct mount *mp, u_long flags) |
| 344 | { |
| 345 | |
| 346 | /* No exporting if unprivileged. */ |
| 347 | if (flags & MNT_EXPORTED) |
| 348 | return EPERM; |
| 349 | |
| 350 | /* Must have 'nosuid' and 'nodev'. */ |
| 351 | if ((flags & MNT_NODEV) == 0 || (flags & MNT_NOSUID) == 0) |
| 352 | return EPERM; |
| 353 | |
| 354 | /* Retain 'noexec'. */ |
| 355 | if ((mp->mnt_flag & MNT_NOEXEC) && (flags & MNT_NOEXEC) == 0) |
| 356 | return EPERM; |
| 357 | |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | static int |
| 362 | mount_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, |
| 363 | void *arg0, void *arg1, void *arg2, void *arg3) |
| 364 | { |
| 365 | int result; |
| 366 | enum kauth_system_req req; |
| 367 | |
| 368 | result = KAUTH_RESULT_DEFER; |
| 369 | req = (enum kauth_system_req)arg0; |
| 370 | |
| 371 | if (action != KAUTH_SYSTEM_MOUNT) |
| 372 | return result; |
| 373 | |
| 374 | if (req == KAUTH_REQ_SYSTEM_MOUNT_GET) |
| 375 | result = KAUTH_RESULT_ALLOW; |
| 376 | else if (req == KAUTH_REQ_SYSTEM_MOUNT_DEVICE) { |
| 377 | vnode_t *devvp = arg2; |
| 378 | mode_t access_mode = (mode_t)(unsigned long)arg3; |
| 379 | int error; |
| 380 | |
| 381 | error = VOP_ACCESS(devvp, access_mode, cred); |
| 382 | if (!error) |
| 383 | result = KAUTH_RESULT_ALLOW; |
| 384 | } |
| 385 | |
| 386 | return result; |
| 387 | } |
| 388 | |
| 389 | /* |
| 390 | * Initialize the vnode structures and initialize each file system type. |
| 391 | */ |
| 392 | void |
| 393 | vfsinit(void) |
| 394 | { |
| 395 | |
| 396 | /* |
| 397 | * Attach sysctl nodes |
| 398 | */ |
| 399 | sysctl_vfs_setup(); |
| 400 | |
| 401 | /* |
| 402 | * Initialize the namei pathname buffer pool and cache. |
| 403 | */ |
| 404 | pnbuf_cache = pool_cache_init(MAXPATHLEN, 0, 0, 0, "pnbufpl" , |
| 405 | NULL, IPL_NONE, NULL, NULL, NULL); |
| 406 | KASSERT(pnbuf_cache != NULL); |
| 407 | |
| 408 | /* |
| 409 | * Initialize the vnode table |
| 410 | */ |
| 411 | vntblinit(); |
| 412 | |
| 413 | /* |
| 414 | * Initialize the vnode name cache |
| 415 | */ |
| 416 | nchinit(); |
| 417 | |
| 418 | #ifdef DEBUG |
| 419 | /* |
| 420 | * Check the list of vnode operations. |
| 421 | */ |
| 422 | vfs_op_check(); |
| 423 | #endif |
| 424 | |
| 425 | /* |
| 426 | * Initialize the special vnode operations. |
| 427 | */ |
| 428 | vfs_opv_init(vfs_special_vnodeopv_descs); |
| 429 | |
| 430 | /* |
| 431 | * Initialise generic dirhash. |
| 432 | */ |
| 433 | dirhash_init(); |
| 434 | |
| 435 | /* |
| 436 | * Initialise VFS hooks. |
| 437 | */ |
| 438 | vfs_hooks_init(); |
| 439 | |
| 440 | mount_listener = kauth_listen_scope(KAUTH_SCOPE_SYSTEM, |
| 441 | mount_listener_cb, NULL); |
| 442 | |
| 443 | /* |
| 444 | * Establish each file system which was statically |
| 445 | * included in the kernel. |
| 446 | */ |
| 447 | module_init_class(MODULE_CLASS_VFS); |
| 448 | } |
| 449 | |
| 450 | /* |
| 451 | * Drop a reference to a file system type. |
| 452 | */ |
| 453 | void |
| 454 | vfs_delref(struct vfsops *vfs) |
| 455 | { |
| 456 | |
| 457 | mutex_enter(&vfs_list_lock); |
| 458 | vfs->vfs_refcount--; |
| 459 | mutex_exit(&vfs_list_lock); |
| 460 | } |
| 461 | |
| 462 | /* |
| 463 | * Establish a file system and initialize it. |
| 464 | */ |
| 465 | int |
| 466 | vfs_attach(struct vfsops *vfs) |
| 467 | { |
| 468 | struct vfsops *v; |
| 469 | int error = 0; |
| 470 | |
| 471 | mutex_enter(&vfs_list_lock); |
| 472 | |
| 473 | /* |
| 474 | * Make sure this file system doesn't already exist. |
| 475 | */ |
| 476 | LIST_FOREACH(v, &vfs_list, vfs_list) { |
| 477 | if (strcmp(vfs->vfs_name, v->vfs_name) == 0) { |
| 478 | error = EEXIST; |
| 479 | goto out; |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | /* |
| 484 | * Initialize the vnode operations for this file system. |
| 485 | */ |
| 486 | vfs_opv_init(vfs->vfs_opv_descs); |
| 487 | |
| 488 | /* |
| 489 | * Now initialize the file system itself. |
| 490 | */ |
| 491 | (*vfs->vfs_init)(); |
| 492 | |
| 493 | /* |
| 494 | * ...and link it into the kernel's list. |
| 495 | */ |
| 496 | LIST_INSERT_HEAD(&vfs_list, vfs, vfs_list); |
| 497 | |
| 498 | /* |
| 499 | * Sanity: make sure the reference count is 0. |
| 500 | */ |
| 501 | vfs->vfs_refcount = 0; |
| 502 | out: |
| 503 | mutex_exit(&vfs_list_lock); |
| 504 | return (error); |
| 505 | } |
| 506 | |
| 507 | /* |
| 508 | * Remove a file system from the kernel. |
| 509 | */ |
| 510 | int |
| 511 | vfs_detach(struct vfsops *vfs) |
| 512 | { |
| 513 | struct vfsops *v; |
| 514 | int error = 0; |
| 515 | |
| 516 | mutex_enter(&vfs_list_lock); |
| 517 | |
| 518 | /* |
| 519 | * Make sure no one is using the filesystem. |
| 520 | */ |
| 521 | if (vfs->vfs_refcount != 0) { |
| 522 | error = EBUSY; |
| 523 | goto out; |
| 524 | } |
| 525 | |
| 526 | /* |
| 527 | * ...and remove it from the kernel's list. |
| 528 | */ |
| 529 | LIST_FOREACH(v, &vfs_list, vfs_list) { |
| 530 | if (v == vfs) { |
| 531 | LIST_REMOVE(v, vfs_list); |
| 532 | break; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | if (v == NULL) { |
| 537 | error = ESRCH; |
| 538 | goto out; |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Now run the file system-specific cleanups. |
| 543 | */ |
| 544 | (*vfs->vfs_done)(); |
| 545 | |
| 546 | /* |
| 547 | * Free the vnode operations vector. |
| 548 | */ |
| 549 | vfs_opv_free(vfs->vfs_opv_descs); |
| 550 | out: |
| 551 | mutex_exit(&vfs_list_lock); |
| 552 | return (error); |
| 553 | } |
| 554 | |
| 555 | void |
| 556 | vfs_reinit(void) |
| 557 | { |
| 558 | struct vfsops *vfs; |
| 559 | |
| 560 | mutex_enter(&vfs_list_lock); |
| 561 | LIST_FOREACH(vfs, &vfs_list, vfs_list) { |
| 562 | if (vfs->vfs_reinit) { |
| 563 | vfs->vfs_refcount++; |
| 564 | mutex_exit(&vfs_list_lock); |
| 565 | (*vfs->vfs_reinit)(); |
| 566 | mutex_enter(&vfs_list_lock); |
| 567 | vfs->vfs_refcount--; |
| 568 | } |
| 569 | } |
| 570 | mutex_exit(&vfs_list_lock); |
| 571 | } |
| 572 | |