| 1 | /* $NetBSD: vfs_mount.c,v 1.41 2016/11/03 11:03:31 hannken Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1997-2011 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, by Charles M. Hannum, and by Andrew Doran. |
| 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 | * (c) UNIX System Laboratories, Inc. |
| 37 | * All or some portions of this file are derived from material licensed |
| 38 | * to the University of California by American Telephone and Telegraph |
| 39 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 40 | * the permission of UNIX System Laboratories, Inc. |
| 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_subr.c 8.13 (Berkeley) 4/18/94 |
| 67 | */ |
| 68 | |
| 69 | #include <sys/cdefs.h> |
| 70 | __KERNEL_RCSID(0, "$NetBSD: vfs_mount.c,v 1.41 2016/11/03 11:03:31 hannken Exp $" ); |
| 71 | |
| 72 | #include <sys/param.h> |
| 73 | #include <sys/kernel.h> |
| 74 | |
| 75 | #include <sys/atomic.h> |
| 76 | #include <sys/buf.h> |
| 77 | #include <sys/conf.h> |
| 78 | #include <sys/fcntl.h> |
| 79 | #include <sys/filedesc.h> |
| 80 | #include <sys/device.h> |
| 81 | #include <sys/kauth.h> |
| 82 | #include <sys/kmem.h> |
| 83 | #include <sys/module.h> |
| 84 | #include <sys/mount.h> |
| 85 | #include <sys/namei.h> |
| 86 | #include <sys/extattr.h> |
| 87 | #include <sys/syscallargs.h> |
| 88 | #include <sys/sysctl.h> |
| 89 | #include <sys/systm.h> |
| 90 | #include <sys/vfs_syscalls.h> |
| 91 | #include <sys/vnode_impl.h> |
| 92 | |
| 93 | #include <miscfs/genfs/genfs.h> |
| 94 | #include <miscfs/specfs/specdev.h> |
| 95 | |
| 96 | /* Root filesystem. */ |
| 97 | vnode_t * rootvnode; |
| 98 | |
| 99 | /* Mounted filesystem list. */ |
| 100 | struct mntlist mountlist; |
| 101 | kmutex_t mountlist_lock; |
| 102 | |
| 103 | kmutex_t mntvnode_lock; |
| 104 | kmutex_t vfs_list_lock; |
| 105 | |
| 106 | static specificdata_domain_t mount_specificdata_domain; |
| 107 | static kmutex_t mntid_lock; |
| 108 | |
| 109 | static kmutex_t mountgen_lock; |
| 110 | static uint64_t mountgen; |
| 111 | |
| 112 | void |
| 113 | vfs_mount_sysinit(void) |
| 114 | { |
| 115 | |
| 116 | TAILQ_INIT(&mountlist); |
| 117 | mutex_init(&mountlist_lock, MUTEX_DEFAULT, IPL_NONE); |
| 118 | mutex_init(&mntvnode_lock, MUTEX_DEFAULT, IPL_NONE); |
| 119 | mutex_init(&vfs_list_lock, MUTEX_DEFAULT, IPL_NONE); |
| 120 | |
| 121 | mount_specificdata_domain = specificdata_domain_create(); |
| 122 | mutex_init(&mntid_lock, MUTEX_DEFAULT, IPL_NONE); |
| 123 | mutex_init(&mountgen_lock, MUTEX_DEFAULT, IPL_NONE); |
| 124 | mountgen = 0; |
| 125 | } |
| 126 | |
| 127 | struct mount * |
| 128 | vfs_mountalloc(struct vfsops *vfsops, vnode_t *vp) |
| 129 | { |
| 130 | struct mount *mp; |
| 131 | int error __diagused; |
| 132 | |
| 133 | mp = kmem_zalloc(sizeof(*mp), KM_SLEEP); |
| 134 | if (mp == NULL) |
| 135 | return NULL; |
| 136 | |
| 137 | mp->mnt_op = vfsops; |
| 138 | mp->mnt_refcnt = 1; |
| 139 | TAILQ_INIT(&mp->mnt_vnodelist); |
| 140 | mutex_init(&mp->mnt_unmounting, MUTEX_DEFAULT, IPL_NONE); |
| 141 | mutex_init(&mp->mnt_renamelock, MUTEX_DEFAULT, IPL_NONE); |
| 142 | mutex_init(&mp->mnt_updating, MUTEX_DEFAULT, IPL_NONE); |
| 143 | error = vfs_busy(mp, NULL); |
| 144 | KASSERT(error == 0); |
| 145 | mp->mnt_vnodecovered = vp; |
| 146 | mount_initspecific(mp); |
| 147 | |
| 148 | mutex_enter(&mountgen_lock); |
| 149 | mp->mnt_gen = mountgen++; |
| 150 | mutex_exit(&mountgen_lock); |
| 151 | |
| 152 | return mp; |
| 153 | } |
| 154 | |
| 155 | /* |
| 156 | * vfs_rootmountalloc: lookup a filesystem type, and if found allocate and |
| 157 | * initialize a mount structure for it. |
| 158 | * |
| 159 | * Devname is usually updated by mount(8) after booting. |
| 160 | */ |
| 161 | int |
| 162 | vfs_rootmountalloc(const char *fstypename, const char *devname, |
| 163 | struct mount **mpp) |
| 164 | { |
| 165 | struct vfsops *vfsp = NULL; |
| 166 | struct mount *mp; |
| 167 | |
| 168 | mutex_enter(&vfs_list_lock); |
| 169 | LIST_FOREACH(vfsp, &vfs_list, vfs_list) |
| 170 | if (!strncmp(vfsp->vfs_name, fstypename, |
| 171 | sizeof(mp->mnt_stat.f_fstypename))) |
| 172 | break; |
| 173 | if (vfsp == NULL) { |
| 174 | mutex_exit(&vfs_list_lock); |
| 175 | return (ENODEV); |
| 176 | } |
| 177 | vfsp->vfs_refcount++; |
| 178 | mutex_exit(&vfs_list_lock); |
| 179 | |
| 180 | if ((mp = vfs_mountalloc(vfsp, NULL)) == NULL) |
| 181 | return ENOMEM; |
| 182 | mp->mnt_flag = MNT_RDONLY; |
| 183 | (void)strlcpy(mp->mnt_stat.f_fstypename, vfsp->vfs_name, |
| 184 | sizeof(mp->mnt_stat.f_fstypename)); |
| 185 | mp->mnt_stat.f_mntonname[0] = '/'; |
| 186 | mp->mnt_stat.f_mntonname[1] = '\0'; |
| 187 | mp->mnt_stat.f_mntfromname[sizeof(mp->mnt_stat.f_mntfromname) - 1] = |
| 188 | '\0'; |
| 189 | (void)copystr(devname, mp->mnt_stat.f_mntfromname, |
| 190 | sizeof(mp->mnt_stat.f_mntfromname) - 1, 0); |
| 191 | *mpp = mp; |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | /* |
| 196 | * vfs_getnewfsid: get a new unique fsid. |
| 197 | */ |
| 198 | void |
| 199 | vfs_getnewfsid(struct mount *mp) |
| 200 | { |
| 201 | static u_short xxxfs_mntid; |
| 202 | fsid_t tfsid; |
| 203 | int mtype; |
| 204 | |
| 205 | mutex_enter(&mntid_lock); |
| 206 | mtype = makefstype(mp->mnt_op->vfs_name); |
| 207 | mp->mnt_stat.f_fsidx.__fsid_val[0] = makedev(mtype, 0); |
| 208 | mp->mnt_stat.f_fsidx.__fsid_val[1] = mtype; |
| 209 | mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; |
| 210 | if (xxxfs_mntid == 0) |
| 211 | ++xxxfs_mntid; |
| 212 | tfsid.__fsid_val[0] = makedev(mtype & 0xff, xxxfs_mntid); |
| 213 | tfsid.__fsid_val[1] = mtype; |
| 214 | if (!TAILQ_EMPTY(&mountlist)) { |
| 215 | while (vfs_getvfs(&tfsid)) { |
| 216 | tfsid.__fsid_val[0]++; |
| 217 | xxxfs_mntid++; |
| 218 | } |
| 219 | } |
| 220 | mp->mnt_stat.f_fsidx.__fsid_val[0] = tfsid.__fsid_val[0]; |
| 221 | mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0]; |
| 222 | mutex_exit(&mntid_lock); |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Lookup a mount point by filesystem identifier. |
| 227 | * |
| 228 | * XXX Needs to add a reference to the mount point. |
| 229 | */ |
| 230 | struct mount * |
| 231 | vfs_getvfs(fsid_t *fsid) |
| 232 | { |
| 233 | struct mount *mp; |
| 234 | |
| 235 | mutex_enter(&mountlist_lock); |
| 236 | TAILQ_FOREACH(mp, &mountlist, mnt_list) { |
| 237 | if (mp->mnt_stat.f_fsidx.__fsid_val[0] == fsid->__fsid_val[0] && |
| 238 | mp->mnt_stat.f_fsidx.__fsid_val[1] == fsid->__fsid_val[1]) { |
| 239 | mutex_exit(&mountlist_lock); |
| 240 | return (mp); |
| 241 | } |
| 242 | } |
| 243 | mutex_exit(&mountlist_lock); |
| 244 | return NULL; |
| 245 | } |
| 246 | |
| 247 | /* |
| 248 | * Drop a reference to a mount structure, freeing if the last reference. |
| 249 | */ |
| 250 | void |
| 251 | vfs_destroy(struct mount *mp) |
| 252 | { |
| 253 | |
| 254 | if (__predict_true((int)atomic_dec_uint_nv(&mp->mnt_refcnt) > 0)) { |
| 255 | return; |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * Nothing else has visibility of the mount: we can now |
| 260 | * free the data structures. |
| 261 | */ |
| 262 | KASSERT(mp->mnt_refcnt == 0); |
| 263 | specificdata_fini(mount_specificdata_domain, &mp->mnt_specdataref); |
| 264 | mutex_destroy(&mp->mnt_unmounting); |
| 265 | mutex_destroy(&mp->mnt_updating); |
| 266 | mutex_destroy(&mp->mnt_renamelock); |
| 267 | if (mp->mnt_op != NULL) { |
| 268 | vfs_delref(mp->mnt_op); |
| 269 | } |
| 270 | kmem_free(mp, sizeof(*mp)); |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Mark a mount point as busy, and gain a new reference to it. Used to |
| 275 | * prevent the file system from being unmounted during critical sections. |
| 276 | * |
| 277 | * vfs_busy can be called multiple times and by multiple threads |
| 278 | * and must be accompanied by the same number of vfs_unbusy calls. |
| 279 | * |
| 280 | * => The caller must hold a pre-existing reference to the mount. |
| 281 | * => Will fail if the file system is being unmounted, or is unmounted. |
| 282 | */ |
| 283 | int |
| 284 | vfs_busy(struct mount *mp, struct mount **nextp) |
| 285 | { |
| 286 | |
| 287 | KASSERT(mp->mnt_refcnt > 0); |
| 288 | |
| 289 | mutex_enter(&mp->mnt_unmounting); |
| 290 | if (__predict_false((mp->mnt_iflag & IMNT_GONE) != 0)) { |
| 291 | mutex_exit(&mp->mnt_unmounting); |
| 292 | if (nextp != NULL) { |
| 293 | KASSERT(mutex_owned(&mountlist_lock)); |
| 294 | *nextp = TAILQ_NEXT(mp, mnt_list); |
| 295 | } |
| 296 | return ENOENT; |
| 297 | } |
| 298 | ++mp->mnt_busynest; |
| 299 | KASSERT(mp->mnt_busynest != 0); |
| 300 | mutex_exit(&mp->mnt_unmounting); |
| 301 | if (nextp != NULL) { |
| 302 | mutex_exit(&mountlist_lock); |
| 303 | } |
| 304 | atomic_inc_uint(&mp->mnt_refcnt); |
| 305 | return 0; |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * Unbusy a busy filesystem. |
| 310 | * |
| 311 | * Every successful vfs_busy() call must be undone by a vfs_unbusy() call. |
| 312 | * |
| 313 | * => If keepref is true, preserve reference added by vfs_busy(). |
| 314 | * => If nextp != NULL, acquire mountlist_lock. |
| 315 | */ |
| 316 | void |
| 317 | vfs_unbusy(struct mount *mp, bool keepref, struct mount **nextp) |
| 318 | { |
| 319 | |
| 320 | KASSERT(mp->mnt_refcnt > 0); |
| 321 | |
| 322 | if (nextp != NULL) { |
| 323 | mutex_enter(&mountlist_lock); |
| 324 | } |
| 325 | mutex_enter(&mp->mnt_unmounting); |
| 326 | KASSERT(mp->mnt_busynest != 0); |
| 327 | mp->mnt_busynest--; |
| 328 | mutex_exit(&mp->mnt_unmounting); |
| 329 | if (!keepref) { |
| 330 | vfs_destroy(mp); |
| 331 | } |
| 332 | if (nextp != NULL) { |
| 333 | KASSERT(mutex_owned(&mountlist_lock)); |
| 334 | *nextp = TAILQ_NEXT(mp, mnt_list); |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | struct vnode_iterator { |
| 339 | struct vnode vi_vnode; |
| 340 | }; |
| 341 | |
| 342 | void |
| 343 | vfs_vnode_iterator_init(struct mount *mp, struct vnode_iterator **vip) |
| 344 | { |
| 345 | struct vnode *vp; |
| 346 | |
| 347 | vp = vnalloc_marker(mp); |
| 348 | |
| 349 | mutex_enter(&mntvnode_lock); |
| 350 | TAILQ_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); |
| 351 | vp->v_usecount = 1; |
| 352 | mutex_exit(&mntvnode_lock); |
| 353 | |
| 354 | *vip = (struct vnode_iterator *)vp; |
| 355 | } |
| 356 | |
| 357 | void |
| 358 | vfs_vnode_iterator_destroy(struct vnode_iterator *vi) |
| 359 | { |
| 360 | struct vnode *mvp = &vi->vi_vnode; |
| 361 | |
| 362 | mutex_enter(&mntvnode_lock); |
| 363 | KASSERT(vnis_marker(mvp)); |
| 364 | if (mvp->v_usecount != 0) { |
| 365 | TAILQ_REMOVE(&mvp->v_mount->mnt_vnodelist, mvp, v_mntvnodes); |
| 366 | mvp->v_usecount = 0; |
| 367 | } |
| 368 | mutex_exit(&mntvnode_lock); |
| 369 | vnfree_marker(mvp); |
| 370 | } |
| 371 | |
| 372 | struct vnode * |
| 373 | vfs_vnode_iterator_next(struct vnode_iterator *vi, |
| 374 | bool (*f)(void *, struct vnode *), void *cl) |
| 375 | { |
| 376 | struct vnode *mvp = &vi->vi_vnode; |
| 377 | struct mount *mp = mvp->v_mount; |
| 378 | struct vnode *vp; |
| 379 | int error; |
| 380 | |
| 381 | KASSERT(vnis_marker(mvp)); |
| 382 | |
| 383 | do { |
| 384 | mutex_enter(&mntvnode_lock); |
| 385 | vp = TAILQ_NEXT(mvp, v_mntvnodes); |
| 386 | TAILQ_REMOVE(&mp->mnt_vnodelist, mvp, v_mntvnodes); |
| 387 | mvp->v_usecount = 0; |
| 388 | again: |
| 389 | if (vp == NULL) { |
| 390 | mutex_exit(&mntvnode_lock); |
| 391 | return NULL; |
| 392 | } |
| 393 | mutex_enter(vp->v_interlock); |
| 394 | if (vnis_marker(vp) || |
| 395 | vdead_check(vp, VDEAD_NOWAIT) || |
| 396 | (f && !(*f)(cl, vp))) { |
| 397 | mutex_exit(vp->v_interlock); |
| 398 | vp = TAILQ_NEXT(vp, v_mntvnodes); |
| 399 | goto again; |
| 400 | } |
| 401 | |
| 402 | TAILQ_INSERT_AFTER(&mp->mnt_vnodelist, vp, mvp, v_mntvnodes); |
| 403 | mvp->v_usecount = 1; |
| 404 | mutex_exit(&mntvnode_lock); |
| 405 | error = vget(vp, 0, true /* wait */); |
| 406 | KASSERT(error == 0 || error == ENOENT); |
| 407 | } while (error != 0); |
| 408 | |
| 409 | return vp; |
| 410 | } |
| 411 | |
| 412 | /* |
| 413 | * Move a vnode from one mount queue to another. |
| 414 | */ |
| 415 | void |
| 416 | vfs_insmntque(vnode_t *vp, struct mount *mp) |
| 417 | { |
| 418 | struct mount *omp; |
| 419 | |
| 420 | KASSERT(mp == NULL || (mp->mnt_iflag & IMNT_UNMOUNT) == 0 || |
| 421 | vp->v_tag == VT_VFS); |
| 422 | |
| 423 | mutex_enter(&mntvnode_lock); |
| 424 | /* |
| 425 | * Delete from old mount point vnode list, if on one. |
| 426 | */ |
| 427 | if ((omp = vp->v_mount) != NULL) |
| 428 | TAILQ_REMOVE(&vp->v_mount->mnt_vnodelist, vp, v_mntvnodes); |
| 429 | /* |
| 430 | * Insert into list of vnodes for the new mount point, if |
| 431 | * available. The caller must take a reference on the mount |
| 432 | * structure and donate to the vnode. |
| 433 | */ |
| 434 | if ((vp->v_mount = mp) != NULL) |
| 435 | TAILQ_INSERT_TAIL(&mp->mnt_vnodelist, vp, v_mntvnodes); |
| 436 | mutex_exit(&mntvnode_lock); |
| 437 | |
| 438 | if (omp != NULL) { |
| 439 | /* Release reference to old mount. */ |
| 440 | vfs_destroy(omp); |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | /* |
| 445 | * Remove any vnodes in the vnode table belonging to mount point mp. |
| 446 | * |
| 447 | * If FORCECLOSE is not specified, there should not be any active ones, |
| 448 | * return error if any are found (nb: this is a user error, not a |
| 449 | * system error). If FORCECLOSE is specified, detach any active vnodes |
| 450 | * that are found. |
| 451 | * |
| 452 | * If WRITECLOSE is set, only flush out regular file vnodes open for |
| 453 | * writing. |
| 454 | * |
| 455 | * SKIPSYSTEM causes any vnodes marked VV_SYSTEM to be skipped. |
| 456 | */ |
| 457 | #ifdef DEBUG |
| 458 | int busyprt = 0; /* print out busy vnodes */ |
| 459 | struct ctldebug debug1 = { "busyprt" , &busyprt }; |
| 460 | #endif |
| 461 | |
| 462 | struct vflush_ctx { |
| 463 | const struct vnode *skipvp; |
| 464 | int flags; |
| 465 | }; |
| 466 | |
| 467 | static bool |
| 468 | vflush_selector(void *cl, struct vnode *vp) |
| 469 | { |
| 470 | struct vflush_ctx *c = cl; |
| 471 | /* |
| 472 | * Skip over a selected vnode. |
| 473 | */ |
| 474 | if (vp == c->skipvp) |
| 475 | return false; |
| 476 | /* |
| 477 | * Skip over a vnodes marked VSYSTEM. |
| 478 | */ |
| 479 | if ((c->flags & SKIPSYSTEM) && (vp->v_vflag & VV_SYSTEM)) |
| 480 | return false; |
| 481 | |
| 482 | /* |
| 483 | * If WRITECLOSE is set, only flush out regular file |
| 484 | * vnodes open for writing. |
| 485 | */ |
| 486 | if ((c->flags & WRITECLOSE) && vp->v_type == VREG) { |
| 487 | if (vp->v_writecount == 0) |
| 488 | return false; |
| 489 | } |
| 490 | return true; |
| 491 | } |
| 492 | |
| 493 | static vnode_t * |
| 494 | vflushnext(struct vnode_iterator *marker, void *ctx, int *when) |
| 495 | { |
| 496 | if (hardclock_ticks > *when) { |
| 497 | yield(); |
| 498 | *when = hardclock_ticks + hz / 10; |
| 499 | } |
| 500 | return vfs_vnode_iterator_next(marker, vflush_selector, ctx); |
| 501 | } |
| 502 | |
| 503 | |
| 504 | int |
| 505 | vflush(struct mount *mp, vnode_t *skipvp, int flags) |
| 506 | { |
| 507 | vnode_t *vp; |
| 508 | struct vnode_iterator *marker; |
| 509 | int error, busy = 0, when = 0; |
| 510 | struct vflush_ctx ctx; |
| 511 | |
| 512 | /* First, flush out any vnode references from vrele_list. */ |
| 513 | vrele_flush(); |
| 514 | |
| 515 | vfs_vnode_iterator_init(mp, &marker); |
| 516 | |
| 517 | ctx.skipvp = skipvp; |
| 518 | ctx.flags = flags; |
| 519 | while ((vp = vflushnext(marker, &ctx, &when)) != NULL) { |
| 520 | /* |
| 521 | * First try to recycle the vnode. |
| 522 | */ |
| 523 | if (vrecycle(vp)) |
| 524 | continue; |
| 525 | /* |
| 526 | * If FORCECLOSE is set, forcibly close the vnode. |
| 527 | */ |
| 528 | if (flags & FORCECLOSE) { |
| 529 | vgone(vp); |
| 530 | continue; |
| 531 | } |
| 532 | #ifdef DEBUG |
| 533 | if (busyprt) |
| 534 | vprint("vflush: busy vnode" , vp); |
| 535 | #endif |
| 536 | vrele(vp); |
| 537 | busy++; |
| 538 | } |
| 539 | vfs_vnode_iterator_destroy(marker); |
| 540 | if (busy) |
| 541 | return (EBUSY); |
| 542 | |
| 543 | /* Wait for all vnodes to be reclaimed. */ |
| 544 | for (;;) { |
| 545 | mutex_enter(&mntvnode_lock); |
| 546 | TAILQ_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) { |
| 547 | if (vp == skipvp) |
| 548 | continue; |
| 549 | if ((flags & SKIPSYSTEM) && (vp->v_vflag & VV_SYSTEM)) |
| 550 | continue; |
| 551 | break; |
| 552 | } |
| 553 | if (vp != NULL) { |
| 554 | mutex_enter(vp->v_interlock); |
| 555 | mutex_exit(&mntvnode_lock); |
| 556 | error = vget(vp, 0, true /* wait */); |
| 557 | if (error == ENOENT) |
| 558 | continue; |
| 559 | else if (error == 0) |
| 560 | vrele(vp); |
| 561 | return EBUSY; |
| 562 | } else { |
| 563 | mutex_exit(&mntvnode_lock); |
| 564 | return 0; |
| 565 | } |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * Mount a file system. |
| 571 | */ |
| 572 | |
| 573 | /* |
| 574 | * Scan all active processes to see if any of them have a current or root |
| 575 | * directory onto which the new filesystem has just been mounted. If so, |
| 576 | * replace them with the new mount point. |
| 577 | */ |
| 578 | static void |
| 579 | mount_checkdirs(vnode_t *olddp) |
| 580 | { |
| 581 | vnode_t *newdp, *rele1, *rele2; |
| 582 | struct cwdinfo *cwdi; |
| 583 | struct proc *p; |
| 584 | bool retry; |
| 585 | |
| 586 | if (olddp->v_usecount == 1) { |
| 587 | return; |
| 588 | } |
| 589 | if (VFS_ROOT(olddp->v_mountedhere, &newdp)) |
| 590 | panic("mount: lost mount" ); |
| 591 | |
| 592 | do { |
| 593 | retry = false; |
| 594 | mutex_enter(proc_lock); |
| 595 | PROCLIST_FOREACH(p, &allproc) { |
| 596 | if ((cwdi = p->p_cwdi) == NULL) |
| 597 | continue; |
| 598 | /* |
| 599 | * Cannot change to the old directory any more, |
| 600 | * so even if we see a stale value it is not a |
| 601 | * problem. |
| 602 | */ |
| 603 | if (cwdi->cwdi_cdir != olddp && |
| 604 | cwdi->cwdi_rdir != olddp) |
| 605 | continue; |
| 606 | retry = true; |
| 607 | rele1 = NULL; |
| 608 | rele2 = NULL; |
| 609 | atomic_inc_uint(&cwdi->cwdi_refcnt); |
| 610 | mutex_exit(proc_lock); |
| 611 | rw_enter(&cwdi->cwdi_lock, RW_WRITER); |
| 612 | if (cwdi->cwdi_cdir == olddp) { |
| 613 | rele1 = cwdi->cwdi_cdir; |
| 614 | vref(newdp); |
| 615 | cwdi->cwdi_cdir = newdp; |
| 616 | } |
| 617 | if (cwdi->cwdi_rdir == olddp) { |
| 618 | rele2 = cwdi->cwdi_rdir; |
| 619 | vref(newdp); |
| 620 | cwdi->cwdi_rdir = newdp; |
| 621 | } |
| 622 | rw_exit(&cwdi->cwdi_lock); |
| 623 | cwdfree(cwdi); |
| 624 | if (rele1 != NULL) |
| 625 | vrele(rele1); |
| 626 | if (rele2 != NULL) |
| 627 | vrele(rele2); |
| 628 | mutex_enter(proc_lock); |
| 629 | break; |
| 630 | } |
| 631 | mutex_exit(proc_lock); |
| 632 | } while (retry); |
| 633 | |
| 634 | if (rootvnode == olddp) { |
| 635 | vrele(rootvnode); |
| 636 | vref(newdp); |
| 637 | rootvnode = newdp; |
| 638 | } |
| 639 | vput(newdp); |
| 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Start extended attributes |
| 644 | */ |
| 645 | static int |
| 646 | start_extattr(struct mount *mp) |
| 647 | { |
| 648 | int error; |
| 649 | |
| 650 | error = VFS_EXTATTRCTL(mp, EXTATTR_CMD_START, NULL, 0, NULL); |
| 651 | if (error) |
| 652 | printf("%s: failed to start extattr: error = %d\n" , |
| 653 | mp->mnt_stat.f_mntonname, error); |
| 654 | |
| 655 | return error; |
| 656 | } |
| 657 | |
| 658 | int |
| 659 | mount_domount(struct lwp *l, vnode_t **vpp, struct vfsops *vfsops, |
| 660 | const char *path, int flags, void *data, size_t *data_len) |
| 661 | { |
| 662 | vnode_t *vp = *vpp; |
| 663 | struct mount *mp; |
| 664 | struct pathbuf *pb; |
| 665 | struct nameidata nd; |
| 666 | int error; |
| 667 | |
| 668 | error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT, |
| 669 | KAUTH_REQ_SYSTEM_MOUNT_NEW, vp, KAUTH_ARG(flags), data); |
| 670 | if (error) { |
| 671 | vfs_delref(vfsops); |
| 672 | return error; |
| 673 | } |
| 674 | |
| 675 | /* Cannot make a non-dir a mount-point (from here anyway). */ |
| 676 | if (vp->v_type != VDIR) { |
| 677 | vfs_delref(vfsops); |
| 678 | return ENOTDIR; |
| 679 | } |
| 680 | |
| 681 | if (flags & MNT_EXPORTED) { |
| 682 | vfs_delref(vfsops); |
| 683 | return EINVAL; |
| 684 | } |
| 685 | |
| 686 | if ((mp = vfs_mountalloc(vfsops, vp)) == NULL) { |
| 687 | vfs_delref(vfsops); |
| 688 | return ENOMEM; |
| 689 | } |
| 690 | |
| 691 | mp->mnt_stat.f_owner = kauth_cred_geteuid(l->l_cred); |
| 692 | |
| 693 | /* |
| 694 | * The underlying file system may refuse the mount for |
| 695 | * various reasons. Allow the user to force it to happen. |
| 696 | * |
| 697 | * Set the mount level flags. |
| 698 | */ |
| 699 | mp->mnt_flag = flags & (MNT_BASIC_FLAGS | MNT_FORCE | MNT_IGNORE); |
| 700 | |
| 701 | mutex_enter(&mp->mnt_updating); |
| 702 | error = VFS_MOUNT(mp, path, data, data_len); |
| 703 | mp->mnt_flag &= ~MNT_OP_FLAGS; |
| 704 | |
| 705 | if (error != 0) |
| 706 | goto err_unmounted; |
| 707 | |
| 708 | /* |
| 709 | * Validate and prepare the mount point. |
| 710 | */ |
| 711 | error = pathbuf_copyin(path, &pb); |
| 712 | if (error != 0) { |
| 713 | goto err_mounted; |
| 714 | } |
| 715 | NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | TRYEMULROOT, pb); |
| 716 | error = namei(&nd); |
| 717 | pathbuf_destroy(pb); |
| 718 | if (error != 0) { |
| 719 | goto err_mounted; |
| 720 | } |
| 721 | if (nd.ni_vp != vp) { |
| 722 | vput(nd.ni_vp); |
| 723 | error = EINVAL; |
| 724 | goto err_mounted; |
| 725 | } |
| 726 | if (vp->v_mountedhere != NULL) { |
| 727 | vput(nd.ni_vp); |
| 728 | error = EBUSY; |
| 729 | goto err_mounted; |
| 730 | } |
| 731 | error = vinvalbuf(vp, V_SAVE, l->l_cred, l, 0, 0); |
| 732 | if (error != 0) { |
| 733 | vput(nd.ni_vp); |
| 734 | goto err_mounted; |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * Put the new filesystem on the mount list after root. |
| 739 | */ |
| 740 | cache_purge(vp); |
| 741 | mp->mnt_iflag &= ~IMNT_WANTRDWR; |
| 742 | |
| 743 | mutex_enter(&mountlist_lock); |
| 744 | TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); |
| 745 | mutex_exit(&mountlist_lock); |
| 746 | if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) |
| 747 | vfs_syncer_add_to_worklist(mp); |
| 748 | vp->v_mountedhere = mp; |
| 749 | vput(nd.ni_vp); |
| 750 | |
| 751 | mount_checkdirs(vp); |
| 752 | mutex_exit(&mp->mnt_updating); |
| 753 | |
| 754 | /* Hold an additional reference to the mount across VFS_START(). */ |
| 755 | vfs_unbusy(mp, true, NULL); |
| 756 | (void) VFS_STATVFS(mp, &mp->mnt_stat); |
| 757 | error = VFS_START(mp, 0); |
| 758 | if (error) { |
| 759 | vrele(vp); |
| 760 | } else if (flags & MNT_EXTATTR) { |
| 761 | (void)start_extattr(mp); |
| 762 | } |
| 763 | /* Drop reference held for VFS_START(). */ |
| 764 | vfs_destroy(mp); |
| 765 | *vpp = NULL; |
| 766 | return error; |
| 767 | |
| 768 | err_mounted: |
| 769 | if (VFS_UNMOUNT(mp, MNT_FORCE) != 0) |
| 770 | panic("Unmounting fresh file system failed" ); |
| 771 | |
| 772 | err_unmounted: |
| 773 | vp->v_mountedhere = NULL; |
| 774 | mutex_exit(&mp->mnt_updating); |
| 775 | vfs_unbusy(mp, false, NULL); |
| 776 | vfs_destroy(mp); |
| 777 | |
| 778 | return error; |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * Do the actual file system unmount. File system is assumed to have |
| 783 | * been locked by the caller. |
| 784 | * |
| 785 | * => Caller hold reference to the mount, explicitly for dounmount(). |
| 786 | */ |
| 787 | int |
| 788 | dounmount(struct mount *mp, int flags, struct lwp *l) |
| 789 | { |
| 790 | vnode_t *coveredvp; |
| 791 | int error, async, used_syncer, used_extattr; |
| 792 | |
| 793 | #if NVERIEXEC > 0 |
| 794 | error = veriexec_unmountchk(mp); |
| 795 | if (error) |
| 796 | return (error); |
| 797 | #endif /* NVERIEXEC > 0 */ |
| 798 | |
| 799 | /* |
| 800 | * XXX Freeze syncer. Must do this before locking the |
| 801 | * mount point. See dounmount() for details. |
| 802 | */ |
| 803 | mutex_enter(&syncer_mutex); |
| 804 | |
| 805 | /* |
| 806 | * Abort unmount attempt when the filesystem is in use |
| 807 | */ |
| 808 | mutex_enter(&mp->mnt_unmounting); |
| 809 | if (mp->mnt_busynest != 0) { |
| 810 | mutex_exit(&mp->mnt_unmounting); |
| 811 | mutex_exit(&syncer_mutex); |
| 812 | return EBUSY; |
| 813 | } |
| 814 | |
| 815 | /* |
| 816 | * Abort unmount attempt when the filesystem is not mounted |
| 817 | */ |
| 818 | if ((mp->mnt_iflag & IMNT_GONE) != 0) { |
| 819 | mutex_exit(&mp->mnt_unmounting); |
| 820 | mutex_exit(&syncer_mutex); |
| 821 | return ENOENT; |
| 822 | } |
| 823 | |
| 824 | used_syncer = (mp->mnt_iflag & IMNT_ONWORKLIST) != 0; |
| 825 | used_extattr = mp->mnt_flag & MNT_EXTATTR; |
| 826 | |
| 827 | /* |
| 828 | * XXX Syncer must be frozen when we get here. This should really |
| 829 | * be done on a per-mountpoint basis, but the syncer doesn't work |
| 830 | * like that. |
| 831 | * |
| 832 | * The caller of dounmount() must acquire syncer_mutex because |
| 833 | * the syncer itself acquires locks in syncer_mutex -> vfs_busy |
| 834 | * order, and we must preserve that order to avoid deadlock. |
| 835 | * |
| 836 | * So, if the file system did not use the syncer, now is |
| 837 | * the time to release the syncer_mutex. |
| 838 | */ |
| 839 | if (used_syncer == 0) { |
| 840 | mutex_exit(&syncer_mutex); |
| 841 | } |
| 842 | mp->mnt_iflag |= IMNT_UNMOUNT; |
| 843 | mutex_enter(&mp->mnt_updating); |
| 844 | async = mp->mnt_flag & MNT_ASYNC; |
| 845 | mp->mnt_flag &= ~MNT_ASYNC; |
| 846 | cache_purgevfs(mp); /* remove cache entries for this file sys */ |
| 847 | if (used_syncer) |
| 848 | vfs_syncer_remove_from_worklist(mp); |
| 849 | error = 0; |
| 850 | if (((mp->mnt_flag & MNT_RDONLY) == 0) && ((flags & MNT_FORCE) == 0)) { |
| 851 | error = VFS_SYNC(mp, MNT_WAIT, l->l_cred); |
| 852 | } |
| 853 | if (error == 0 || (flags & MNT_FORCE)) { |
| 854 | error = VFS_UNMOUNT(mp, flags); |
| 855 | } |
| 856 | if (error) { |
| 857 | mp->mnt_iflag &= ~IMNT_UNMOUNT; |
| 858 | mutex_exit(&mp->mnt_unmounting); |
| 859 | if ((mp->mnt_flag & (MNT_RDONLY | MNT_ASYNC)) == 0) |
| 860 | vfs_syncer_add_to_worklist(mp); |
| 861 | mp->mnt_flag |= async; |
| 862 | mutex_exit(&mp->mnt_updating); |
| 863 | if (used_syncer) |
| 864 | mutex_exit(&syncer_mutex); |
| 865 | if (used_extattr) { |
| 866 | if (start_extattr(mp) != 0) |
| 867 | mp->mnt_flag &= ~MNT_EXTATTR; |
| 868 | else |
| 869 | mp->mnt_flag |= MNT_EXTATTR; |
| 870 | } |
| 871 | return (error); |
| 872 | } |
| 873 | mutex_exit(&mp->mnt_updating); |
| 874 | |
| 875 | /* |
| 876 | * release mnt_umounting lock here, because other code calls |
| 877 | * vfs_busy() while holding the mountlist_lock. |
| 878 | * |
| 879 | * mark filesystem as gone to prevent further umounts |
| 880 | * after mnt_umounting lock is gone, this also prevents |
| 881 | * vfs_busy() from succeeding. |
| 882 | */ |
| 883 | mp->mnt_iflag |= IMNT_GONE; |
| 884 | mutex_exit(&mp->mnt_unmounting); |
| 885 | |
| 886 | if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) { |
| 887 | vn_lock(coveredvp, LK_EXCLUSIVE | LK_RETRY); |
| 888 | coveredvp->v_mountedhere = NULL; |
| 889 | VOP_UNLOCK(coveredvp); |
| 890 | } |
| 891 | mutex_enter(&mountlist_lock); |
| 892 | TAILQ_REMOVE(&mountlist, mp, mnt_list); |
| 893 | mutex_exit(&mountlist_lock); |
| 894 | if (TAILQ_FIRST(&mp->mnt_vnodelist) != NULL) |
| 895 | panic("unmount: dangling vnode" ); |
| 896 | if (used_syncer) |
| 897 | mutex_exit(&syncer_mutex); |
| 898 | vfs_hooks_unmount(mp); |
| 899 | |
| 900 | vfs_destroy(mp); /* reference from mount() */ |
| 901 | if (coveredvp != NULLVP) { |
| 902 | vrele(coveredvp); |
| 903 | } |
| 904 | return (0); |
| 905 | } |
| 906 | |
| 907 | /* |
| 908 | * Unmount all file systems. |
| 909 | * We traverse the list in reverse order under the assumption that doing so |
| 910 | * will avoid needing to worry about dependencies. |
| 911 | */ |
| 912 | bool |
| 913 | vfs_unmountall(struct lwp *l) |
| 914 | { |
| 915 | |
| 916 | printf("unmounting file systems...\n" ); |
| 917 | return vfs_unmountall1(l, true, true); |
| 918 | } |
| 919 | |
| 920 | static void |
| 921 | vfs_unmount_print(struct mount *mp, const char *pfx) |
| 922 | { |
| 923 | |
| 924 | aprint_verbose("%sunmounted %s on %s type %s\n" , pfx, |
| 925 | mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname, |
| 926 | mp->mnt_stat.f_fstypename); |
| 927 | } |
| 928 | |
| 929 | bool |
| 930 | vfs_unmount_forceone(struct lwp *l) |
| 931 | { |
| 932 | struct mount *mp, *nmp; |
| 933 | int error; |
| 934 | |
| 935 | nmp = NULL; |
| 936 | |
| 937 | TAILQ_FOREACH_REVERSE(mp, &mountlist, mntlist, mnt_list) { |
| 938 | if (nmp == NULL || mp->mnt_gen > nmp->mnt_gen) { |
| 939 | nmp = mp; |
| 940 | } |
| 941 | } |
| 942 | if (nmp == NULL) { |
| 943 | return false; |
| 944 | } |
| 945 | |
| 946 | #ifdef DEBUG |
| 947 | printf("forcefully unmounting %s (%s)...\n" , |
| 948 | nmp->mnt_stat.f_mntonname, nmp->mnt_stat.f_mntfromname); |
| 949 | #endif |
| 950 | atomic_inc_uint(&nmp->mnt_refcnt); |
| 951 | if ((error = dounmount(nmp, MNT_FORCE, l)) == 0) { |
| 952 | vfs_unmount_print(nmp, "forcefully " ); |
| 953 | return true; |
| 954 | } else { |
| 955 | vfs_destroy(nmp); |
| 956 | } |
| 957 | |
| 958 | #ifdef DEBUG |
| 959 | printf("forceful unmount of %s failed with error %d\n" , |
| 960 | nmp->mnt_stat.f_mntonname, error); |
| 961 | #endif |
| 962 | |
| 963 | return false; |
| 964 | } |
| 965 | |
| 966 | bool |
| 967 | vfs_unmountall1(struct lwp *l, bool force, bool verbose) |
| 968 | { |
| 969 | struct mount *mp, *nmp; |
| 970 | bool any_error = false, progress = false; |
| 971 | int error; |
| 972 | |
| 973 | TAILQ_FOREACH_REVERSE_SAFE(mp, &mountlist, mntlist, mnt_list, nmp) { |
| 974 | #ifdef DEBUG |
| 975 | printf("unmounting %p %s (%s)...\n" , |
| 976 | (void *)mp, mp->mnt_stat.f_mntonname, |
| 977 | mp->mnt_stat.f_mntfromname); |
| 978 | #endif |
| 979 | atomic_inc_uint(&mp->mnt_refcnt); |
| 980 | if ((error = dounmount(mp, force ? MNT_FORCE : 0, l)) == 0) { |
| 981 | vfs_unmount_print(mp, "" ); |
| 982 | progress = true; |
| 983 | } else { |
| 984 | vfs_destroy(mp); |
| 985 | if (verbose) { |
| 986 | printf("unmount of %s failed with error %d\n" , |
| 987 | mp->mnt_stat.f_mntonname, error); |
| 988 | } |
| 989 | any_error = true; |
| 990 | } |
| 991 | } |
| 992 | if (verbose) { |
| 993 | printf("unmounting done\n" ); |
| 994 | } |
| 995 | if (any_error && verbose) { |
| 996 | printf("WARNING: some file systems would not unmount\n" ); |
| 997 | } |
| 998 | return progress; |
| 999 | } |
| 1000 | |
| 1001 | void |
| 1002 | vfs_sync_all(struct lwp *l) |
| 1003 | { |
| 1004 | printf("syncing disks... " ); |
| 1005 | |
| 1006 | /* remove user processes from run queue */ |
| 1007 | suspendsched(); |
| 1008 | (void)spl0(); |
| 1009 | |
| 1010 | /* avoid coming back this way again if we panic. */ |
| 1011 | doing_shutdown = 1; |
| 1012 | |
| 1013 | do_sys_sync(l); |
| 1014 | |
| 1015 | /* Wait for sync to finish. */ |
| 1016 | if (buf_syncwait() != 0) { |
| 1017 | #if defined(DDB) && defined(DEBUG_HALT_BUSY) |
| 1018 | Debugger(); |
| 1019 | #endif |
| 1020 | printf("giving up\n" ); |
| 1021 | return; |
| 1022 | } else |
| 1023 | printf("done\n" ); |
| 1024 | } |
| 1025 | |
| 1026 | /* |
| 1027 | * Sync and unmount file systems before shutting down. |
| 1028 | */ |
| 1029 | void |
| 1030 | vfs_shutdown(void) |
| 1031 | { |
| 1032 | lwp_t *l = curlwp; |
| 1033 | |
| 1034 | vfs_sync_all(l); |
| 1035 | |
| 1036 | /* |
| 1037 | * If we have paniced - do not make the situation potentially |
| 1038 | * worse by unmounting the file systems. |
| 1039 | */ |
| 1040 | if (panicstr != NULL) { |
| 1041 | return; |
| 1042 | } |
| 1043 | |
| 1044 | /* Unmount file systems. */ |
| 1045 | vfs_unmountall(l); |
| 1046 | } |
| 1047 | |
| 1048 | /* |
| 1049 | * Print a list of supported file system types (used by vfs_mountroot) |
| 1050 | */ |
| 1051 | static void |
| 1052 | vfs_print_fstypes(void) |
| 1053 | { |
| 1054 | struct vfsops *v; |
| 1055 | int cnt = 0; |
| 1056 | |
| 1057 | mutex_enter(&vfs_list_lock); |
| 1058 | LIST_FOREACH(v, &vfs_list, vfs_list) |
| 1059 | ++cnt; |
| 1060 | mutex_exit(&vfs_list_lock); |
| 1061 | |
| 1062 | if (cnt == 0) { |
| 1063 | printf("WARNING: No file system modules have been loaded.\n" ); |
| 1064 | return; |
| 1065 | } |
| 1066 | |
| 1067 | printf("Supported file systems:" ); |
| 1068 | mutex_enter(&vfs_list_lock); |
| 1069 | LIST_FOREACH(v, &vfs_list, vfs_list) { |
| 1070 | printf(" %s" , v->vfs_name); |
| 1071 | } |
| 1072 | mutex_exit(&vfs_list_lock); |
| 1073 | printf("\n" ); |
| 1074 | } |
| 1075 | |
| 1076 | /* |
| 1077 | * Mount the root file system. If the operator didn't specify a |
| 1078 | * file system to use, try all possible file systems until one |
| 1079 | * succeeds. |
| 1080 | */ |
| 1081 | int |
| 1082 | vfs_mountroot(void) |
| 1083 | { |
| 1084 | struct vfsops *v; |
| 1085 | int error = ENODEV; |
| 1086 | |
| 1087 | if (root_device == NULL) |
| 1088 | panic("vfs_mountroot: root device unknown" ); |
| 1089 | |
| 1090 | switch (device_class(root_device)) { |
| 1091 | case DV_IFNET: |
| 1092 | if (rootdev != NODEV) |
| 1093 | panic("vfs_mountroot: rootdev set for DV_IFNET " |
| 1094 | "(0x%llx -> %llu,%llu)" , |
| 1095 | (unsigned long long)rootdev, |
| 1096 | (unsigned long long)major(rootdev), |
| 1097 | (unsigned long long)minor(rootdev)); |
| 1098 | break; |
| 1099 | |
| 1100 | case DV_DISK: |
| 1101 | if (rootdev == NODEV) |
| 1102 | panic("vfs_mountroot: rootdev not set for DV_DISK" ); |
| 1103 | if (bdevvp(rootdev, &rootvp)) |
| 1104 | panic("vfs_mountroot: can't get vnode for rootdev" ); |
| 1105 | error = VOP_OPEN(rootvp, FREAD, FSCRED); |
| 1106 | if (error) { |
| 1107 | printf("vfs_mountroot: can't open root device\n" ); |
| 1108 | return (error); |
| 1109 | } |
| 1110 | break; |
| 1111 | |
| 1112 | case DV_VIRTUAL: |
| 1113 | break; |
| 1114 | |
| 1115 | default: |
| 1116 | printf("%s: inappropriate for root file system\n" , |
| 1117 | device_xname(root_device)); |
| 1118 | return (ENODEV); |
| 1119 | } |
| 1120 | |
| 1121 | /* |
| 1122 | * If user specified a root fs type, use it. Make sure the |
| 1123 | * specified type exists and has a mount_root() |
| 1124 | */ |
| 1125 | if (strcmp(rootfstype, ROOT_FSTYPE_ANY) != 0) { |
| 1126 | v = vfs_getopsbyname(rootfstype); |
| 1127 | error = EFTYPE; |
| 1128 | if (v != NULL) { |
| 1129 | if (v->vfs_mountroot != NULL) { |
| 1130 | error = (v->vfs_mountroot)(); |
| 1131 | } |
| 1132 | v->vfs_refcount--; |
| 1133 | } |
| 1134 | goto done; |
| 1135 | } |
| 1136 | |
| 1137 | /* |
| 1138 | * Try each file system currently configured into the kernel. |
| 1139 | */ |
| 1140 | mutex_enter(&vfs_list_lock); |
| 1141 | LIST_FOREACH(v, &vfs_list, vfs_list) { |
| 1142 | if (v->vfs_mountroot == NULL) |
| 1143 | continue; |
| 1144 | #ifdef DEBUG |
| 1145 | aprint_normal("mountroot: trying %s...\n" , v->vfs_name); |
| 1146 | #endif |
| 1147 | v->vfs_refcount++; |
| 1148 | mutex_exit(&vfs_list_lock); |
| 1149 | error = (*v->vfs_mountroot)(); |
| 1150 | mutex_enter(&vfs_list_lock); |
| 1151 | v->vfs_refcount--; |
| 1152 | if (!error) { |
| 1153 | aprint_normal("root file system type: %s\n" , |
| 1154 | v->vfs_name); |
| 1155 | break; |
| 1156 | } |
| 1157 | } |
| 1158 | mutex_exit(&vfs_list_lock); |
| 1159 | |
| 1160 | if (v == NULL) { |
| 1161 | vfs_print_fstypes(); |
| 1162 | printf("no file system for %s" , device_xname(root_device)); |
| 1163 | if (device_class(root_device) == DV_DISK) |
| 1164 | printf(" (dev 0x%llx)" , (unsigned long long)rootdev); |
| 1165 | printf("\n" ); |
| 1166 | error = EFTYPE; |
| 1167 | } |
| 1168 | |
| 1169 | done: |
| 1170 | if (error && device_class(root_device) == DV_DISK) { |
| 1171 | VOP_CLOSE(rootvp, FREAD, FSCRED); |
| 1172 | vrele(rootvp); |
| 1173 | } |
| 1174 | if (error == 0) { |
| 1175 | struct mount *mp; |
| 1176 | extern struct cwdinfo cwdi0; |
| 1177 | |
| 1178 | mp = TAILQ_FIRST(&mountlist); |
| 1179 | mp->mnt_flag |= MNT_ROOTFS; |
| 1180 | mp->mnt_op->vfs_refcount++; |
| 1181 | |
| 1182 | /* |
| 1183 | * Get the vnode for '/'. Set cwdi0.cwdi_cdir to |
| 1184 | * reference it. |
| 1185 | */ |
| 1186 | error = VFS_ROOT(mp, &rootvnode); |
| 1187 | if (error) |
| 1188 | panic("cannot find root vnode, error=%d" , error); |
| 1189 | cwdi0.cwdi_cdir = rootvnode; |
| 1190 | vref(cwdi0.cwdi_cdir); |
| 1191 | VOP_UNLOCK(rootvnode); |
| 1192 | cwdi0.cwdi_rdir = NULL; |
| 1193 | |
| 1194 | /* |
| 1195 | * Now that root is mounted, we can fixup initproc's CWD |
| 1196 | * info. All other processes are kthreads, which merely |
| 1197 | * share proc0's CWD info. |
| 1198 | */ |
| 1199 | initproc->p_cwdi->cwdi_cdir = rootvnode; |
| 1200 | vref(initproc->p_cwdi->cwdi_cdir); |
| 1201 | initproc->p_cwdi->cwdi_rdir = NULL; |
| 1202 | /* |
| 1203 | * Enable loading of modules from the filesystem |
| 1204 | */ |
| 1205 | module_load_vfs_init(); |
| 1206 | |
| 1207 | } |
| 1208 | return (error); |
| 1209 | } |
| 1210 | |
| 1211 | /* |
| 1212 | * mount_specific_key_create -- |
| 1213 | * Create a key for subsystem mount-specific data. |
| 1214 | */ |
| 1215 | int |
| 1216 | mount_specific_key_create(specificdata_key_t *keyp, specificdata_dtor_t dtor) |
| 1217 | { |
| 1218 | |
| 1219 | return specificdata_key_create(mount_specificdata_domain, keyp, dtor); |
| 1220 | } |
| 1221 | |
| 1222 | /* |
| 1223 | * mount_specific_key_delete -- |
| 1224 | * Delete a key for subsystem mount-specific data. |
| 1225 | */ |
| 1226 | void |
| 1227 | mount_specific_key_delete(specificdata_key_t key) |
| 1228 | { |
| 1229 | |
| 1230 | specificdata_key_delete(mount_specificdata_domain, key); |
| 1231 | } |
| 1232 | |
| 1233 | /* |
| 1234 | * mount_initspecific -- |
| 1235 | * Initialize a mount's specificdata container. |
| 1236 | */ |
| 1237 | void |
| 1238 | mount_initspecific(struct mount *mp) |
| 1239 | { |
| 1240 | int error __diagused; |
| 1241 | |
| 1242 | error = specificdata_init(mount_specificdata_domain, |
| 1243 | &mp->mnt_specdataref); |
| 1244 | KASSERT(error == 0); |
| 1245 | } |
| 1246 | |
| 1247 | /* |
| 1248 | * mount_finispecific -- |
| 1249 | * Finalize a mount's specificdata container. |
| 1250 | */ |
| 1251 | void |
| 1252 | mount_finispecific(struct mount *mp) |
| 1253 | { |
| 1254 | |
| 1255 | specificdata_fini(mount_specificdata_domain, &mp->mnt_specdataref); |
| 1256 | } |
| 1257 | |
| 1258 | /* |
| 1259 | * mount_getspecific -- |
| 1260 | * Return mount-specific data corresponding to the specified key. |
| 1261 | */ |
| 1262 | void * |
| 1263 | mount_getspecific(struct mount *mp, specificdata_key_t key) |
| 1264 | { |
| 1265 | |
| 1266 | return specificdata_getspecific(mount_specificdata_domain, |
| 1267 | &mp->mnt_specdataref, key); |
| 1268 | } |
| 1269 | |
| 1270 | /* |
| 1271 | * mount_setspecific -- |
| 1272 | * Set mount-specific data corresponding to the specified key. |
| 1273 | */ |
| 1274 | void |
| 1275 | mount_setspecific(struct mount *mp, specificdata_key_t key, void *data) |
| 1276 | { |
| 1277 | |
| 1278 | specificdata_setspecific(mount_specificdata_domain, |
| 1279 | &mp->mnt_specdataref, key, data); |
| 1280 | } |
| 1281 | |
| 1282 | /* |
| 1283 | * Check to see if a filesystem is mounted on a block device. |
| 1284 | */ |
| 1285 | int |
| 1286 | vfs_mountedon(vnode_t *vp) |
| 1287 | { |
| 1288 | vnode_t *vq; |
| 1289 | int error = 0; |
| 1290 | |
| 1291 | if (vp->v_type != VBLK) |
| 1292 | return ENOTBLK; |
| 1293 | if (spec_node_getmountedfs(vp) != NULL) |
| 1294 | return EBUSY; |
| 1295 | if (spec_node_lookup_by_dev(vp->v_type, vp->v_rdev, &vq) == 0) { |
| 1296 | if (spec_node_getmountedfs(vq) != NULL) |
| 1297 | error = EBUSY; |
| 1298 | vrele(vq); |
| 1299 | } |
| 1300 | |
| 1301 | return error; |
| 1302 | } |
| 1303 | |
| 1304 | /* |
| 1305 | * Check if a device pointed to by vp is mounted. |
| 1306 | * |
| 1307 | * Returns: |
| 1308 | * EINVAL if it's not a disk |
| 1309 | * EBUSY if it's a disk and mounted |
| 1310 | * 0 if it's a disk and not mounted |
| 1311 | */ |
| 1312 | int |
| 1313 | rawdev_mounted(vnode_t *vp, vnode_t **bvpp) |
| 1314 | { |
| 1315 | vnode_t *bvp; |
| 1316 | dev_t dev; |
| 1317 | int d_type; |
| 1318 | |
| 1319 | bvp = NULL; |
| 1320 | d_type = D_OTHER; |
| 1321 | |
| 1322 | if (iskmemvp(vp)) |
| 1323 | return EINVAL; |
| 1324 | |
| 1325 | switch (vp->v_type) { |
| 1326 | case VCHR: { |
| 1327 | const struct cdevsw *cdev; |
| 1328 | |
| 1329 | dev = vp->v_rdev; |
| 1330 | cdev = cdevsw_lookup(dev); |
| 1331 | if (cdev != NULL) { |
| 1332 | dev_t blkdev; |
| 1333 | |
| 1334 | blkdev = devsw_chr2blk(dev); |
| 1335 | if (blkdev != NODEV) { |
| 1336 | if (vfinddev(blkdev, VBLK, &bvp) != 0) { |
| 1337 | d_type = (cdev->d_flag & D_TYPEMASK); |
| 1338 | /* XXX: what if bvp disappears? */ |
| 1339 | vrele(bvp); |
| 1340 | } |
| 1341 | } |
| 1342 | } |
| 1343 | |
| 1344 | break; |
| 1345 | } |
| 1346 | |
| 1347 | case VBLK: { |
| 1348 | const struct bdevsw *bdev; |
| 1349 | |
| 1350 | dev = vp->v_rdev; |
| 1351 | bdev = bdevsw_lookup(dev); |
| 1352 | if (bdev != NULL) |
| 1353 | d_type = (bdev->d_flag & D_TYPEMASK); |
| 1354 | |
| 1355 | bvp = vp; |
| 1356 | |
| 1357 | break; |
| 1358 | } |
| 1359 | |
| 1360 | default: |
| 1361 | break; |
| 1362 | } |
| 1363 | |
| 1364 | if (d_type != D_DISK) |
| 1365 | return EINVAL; |
| 1366 | |
| 1367 | if (bvpp != NULL) |
| 1368 | *bvpp = bvp; |
| 1369 | |
| 1370 | /* |
| 1371 | * XXX: This is bogus. We should be failing the request |
| 1372 | * XXX: not only if this specific slice is mounted, but |
| 1373 | * XXX: if it's on a disk with any other mounted slice. |
| 1374 | */ |
| 1375 | if (vfs_mountedon(bvp)) |
| 1376 | return EBUSY; |
| 1377 | |
| 1378 | return 0; |
| 1379 | } |
| 1380 | |
| 1381 | /* |
| 1382 | * Make a 'unique' number from a mount type name. |
| 1383 | */ |
| 1384 | long |
| 1385 | makefstype(const char *type) |
| 1386 | { |
| 1387 | long rv; |
| 1388 | |
| 1389 | for (rv = 0; *type; type++) { |
| 1390 | rv <<= 2; |
| 1391 | rv ^= *type; |
| 1392 | } |
| 1393 | return rv; |
| 1394 | } |
| 1395 | |
| 1396 | void |
| 1397 | mountlist_append(struct mount *mp) |
| 1398 | { |
| 1399 | mutex_enter(&mountlist_lock); |
| 1400 | TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list); |
| 1401 | mutex_exit(&mountlist_lock); |
| 1402 | } |
| 1403 | |