| 1 | /* $NetBSD: vnd.c,v 1.258 2016/08/05 08:21:24 pgoyette Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 1996, 1997, 1998, 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. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * Copyright (c) 1988 University of Utah. |
| 34 | * Copyright (c) 1990, 1993 |
| 35 | * The Regents of the University of California. All rights reserved. |
| 36 | * |
| 37 | * This code is derived from software contributed to Berkeley by |
| 38 | * the Systems Programming Group of the University of Utah Computer |
| 39 | * Science Department. |
| 40 | * |
| 41 | * Redistribution and use in source and binary forms, with or without |
| 42 | * modification, are permitted provided that the following conditions |
| 43 | * are met: |
| 44 | * 1. Redistributions of source code must retain the above copyright |
| 45 | * notice, this list of conditions and the following disclaimer. |
| 46 | * 2. Redistributions in binary form must reproduce the above copyright |
| 47 | * notice, this list of conditions and the following disclaimer in the |
| 48 | * documentation and/or other materials provided with the distribution. |
| 49 | * 3. Neither the name of the University nor the names of its contributors |
| 50 | * may be used to endorse or promote products derived from this software |
| 51 | * without specific prior written permission. |
| 52 | * |
| 53 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 54 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 55 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 56 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 57 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 58 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 59 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 60 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 61 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 62 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 63 | * SUCH DAMAGE. |
| 64 | * |
| 65 | * from: Utah $Hdr: vn.c 1.13 94/04/02$ |
| 66 | * |
| 67 | * @(#)vn.c 8.9 (Berkeley) 5/14/95 |
| 68 | */ |
| 69 | |
| 70 | /* |
| 71 | * Vnode disk driver. |
| 72 | * |
| 73 | * Block/character interface to a vnode. Allows one to treat a file |
| 74 | * as a disk (e.g. build a filesystem in it, mount it, etc.). |
| 75 | * |
| 76 | * NOTE 1: If the vnode supports the VOP_BMAP and VOP_STRATEGY operations, |
| 77 | * this uses them to avoid distorting the local buffer cache. If those |
| 78 | * block-level operations are not available, this falls back to the regular |
| 79 | * read and write calls. Using these may distort the cache in some cases |
| 80 | * but better have the driver working than preventing it to work on file |
| 81 | * systems where the block-level operations are not implemented for |
| 82 | * whatever reason. |
| 83 | * |
| 84 | * NOTE 2: There is a security issue involved with this driver. |
| 85 | * Once mounted all access to the contents of the "mapped" file via |
| 86 | * the special file is controlled by the permissions on the special |
| 87 | * file, the protection of the mapped file is ignored (effectively, |
| 88 | * by using root credentials in all transactions). |
| 89 | * |
| 90 | * NOTE 3: Doesn't interact with leases, should it? |
| 91 | */ |
| 92 | |
| 93 | #include <sys/cdefs.h> |
| 94 | __KERNEL_RCSID(0, "$NetBSD: vnd.c,v 1.258 2016/08/05 08:21:24 pgoyette Exp $" ); |
| 95 | |
| 96 | #if defined(_KERNEL_OPT) |
| 97 | #include "opt_vnd.h" |
| 98 | #include "opt_compat_netbsd.h" |
| 99 | #endif |
| 100 | |
| 101 | #include <sys/param.h> |
| 102 | #include <sys/systm.h> |
| 103 | #include <sys/namei.h> |
| 104 | #include <sys/proc.h> |
| 105 | #include <sys/kthread.h> |
| 106 | #include <sys/errno.h> |
| 107 | #include <sys/buf.h> |
| 108 | #include <sys/bufq.h> |
| 109 | #include <sys/malloc.h> |
| 110 | #include <sys/ioctl.h> |
| 111 | #include <sys/disklabel.h> |
| 112 | #include <sys/device.h> |
| 113 | #include <sys/disk.h> |
| 114 | #include <sys/stat.h> |
| 115 | #include <sys/mount.h> |
| 116 | #include <sys/vnode.h> |
| 117 | #include <sys/file.h> |
| 118 | #include <sys/uio.h> |
| 119 | #include <sys/conf.h> |
| 120 | #include <sys/kauth.h> |
| 121 | #include <sys/module.h> |
| 122 | |
| 123 | #include <net/zlib.h> |
| 124 | |
| 125 | #include <miscfs/genfs/genfs.h> |
| 126 | #include <miscfs/specfs/specdev.h> |
| 127 | |
| 128 | #include <dev/dkvar.h> |
| 129 | #include <dev/vndvar.h> |
| 130 | |
| 131 | #include "ioconf.h" |
| 132 | |
| 133 | #if defined(VNDDEBUG) && !defined(DEBUG) |
| 134 | #define DEBUG |
| 135 | #endif |
| 136 | |
| 137 | #ifdef DEBUG |
| 138 | int dovndcluster = 1; |
| 139 | #define VDB_FOLLOW 0x01 |
| 140 | #define VDB_INIT 0x02 |
| 141 | #define VDB_IO 0x04 |
| 142 | #define VDB_LABEL 0x08 |
| 143 | int vnddebug = 0; |
| 144 | #endif |
| 145 | |
| 146 | #define vndunit(x) DISKUNIT(x) |
| 147 | |
| 148 | struct vndxfer { |
| 149 | struct buf vx_buf; |
| 150 | struct vnd_softc *vx_vnd; |
| 151 | }; |
| 152 | #define VND_BUFTOXFER(bp) ((struct vndxfer *)(void *)bp) |
| 153 | |
| 154 | #define VND_GETXFER(vnd) pool_get(&(vnd)->sc_vxpool, PR_WAITOK) |
| 155 | #define VND_PUTXFER(vnd, vx) pool_put(&(vnd)->sc_vxpool, (vx)) |
| 156 | |
| 157 | #define VNDLABELDEV(dev) \ |
| 158 | (MAKEDISKDEV(major((dev)), vndunit((dev)), RAW_PART)) |
| 159 | |
| 160 | #define VND_MAXPENDING(vnd) ((vnd)->sc_maxactive * 4) |
| 161 | |
| 162 | |
| 163 | static void vndclear(struct vnd_softc *, int); |
| 164 | static int vnddoclear(struct vnd_softc *, int, int, bool); |
| 165 | static int vndsetcred(struct vnd_softc *, kauth_cred_t); |
| 166 | static void vndthrottle(struct vnd_softc *, struct vnode *); |
| 167 | static void vndiodone(struct buf *); |
| 168 | #if 0 |
| 169 | static void vndshutdown(void); |
| 170 | #endif |
| 171 | |
| 172 | static void vndgetdefaultlabel(struct vnd_softc *, struct disklabel *); |
| 173 | static void vndgetdisklabel(dev_t, struct vnd_softc *); |
| 174 | |
| 175 | static int vndlock(struct vnd_softc *); |
| 176 | static void vndunlock(struct vnd_softc *); |
| 177 | #ifdef VND_COMPRESSION |
| 178 | static void compstrategy(struct buf *, off_t); |
| 179 | static void *vnd_alloc(void *, u_int, u_int); |
| 180 | static void vnd_free(void *, void *); |
| 181 | #endif /* VND_COMPRESSION */ |
| 182 | |
| 183 | static void vndthread(void *); |
| 184 | static bool vnode_has_op(const struct vnode *, int); |
| 185 | static void handle_with_rdwr(struct vnd_softc *, const struct buf *, |
| 186 | struct buf *); |
| 187 | static void handle_with_strategy(struct vnd_softc *, const struct buf *, |
| 188 | struct buf *); |
| 189 | static void vnd_set_geometry(struct vnd_softc *); |
| 190 | |
| 191 | static dev_type_open(vndopen); |
| 192 | static dev_type_close(vndclose); |
| 193 | static dev_type_read(vndread); |
| 194 | static dev_type_write(vndwrite); |
| 195 | static dev_type_ioctl(vndioctl); |
| 196 | static dev_type_strategy(vndstrategy); |
| 197 | static dev_type_dump(vnddump); |
| 198 | static dev_type_size(vndsize); |
| 199 | |
| 200 | const struct bdevsw vnd_bdevsw = { |
| 201 | .d_open = vndopen, |
| 202 | .d_close = vndclose, |
| 203 | .d_strategy = vndstrategy, |
| 204 | .d_ioctl = vndioctl, |
| 205 | .d_dump = vnddump, |
| 206 | .d_psize = vndsize, |
| 207 | .d_discard = nodiscard, |
| 208 | .d_flag = D_DISK |
| 209 | }; |
| 210 | |
| 211 | const struct cdevsw vnd_cdevsw = { |
| 212 | .d_open = vndopen, |
| 213 | .d_close = vndclose, |
| 214 | .d_read = vndread, |
| 215 | .d_write = vndwrite, |
| 216 | .d_ioctl = vndioctl, |
| 217 | .d_stop = nostop, |
| 218 | .d_tty = notty, |
| 219 | .d_poll = nopoll, |
| 220 | .d_mmap = nommap, |
| 221 | .d_kqfilter = nokqfilter, |
| 222 | .d_discard = nodiscard, |
| 223 | .d_flag = D_DISK |
| 224 | }; |
| 225 | |
| 226 | static int vnd_match(device_t, cfdata_t, void *); |
| 227 | static void vnd_attach(device_t, device_t, void *); |
| 228 | static int vnd_detach(device_t, int); |
| 229 | |
| 230 | CFATTACH_DECL3_NEW(vnd, sizeof(struct vnd_softc), |
| 231 | vnd_match, vnd_attach, vnd_detach, NULL, NULL, NULL, DVF_DETACH_SHUTDOWN); |
| 232 | extern struct cfdriver vnd_cd; |
| 233 | |
| 234 | static struct vnd_softc *vnd_spawn(int); |
| 235 | int vnd_destroy(device_t); |
| 236 | |
| 237 | static struct dkdriver vnddkdriver = { |
| 238 | .d_strategy = vndstrategy, |
| 239 | .d_minphys = minphys |
| 240 | }; |
| 241 | |
| 242 | void |
| 243 | vndattach(int num) |
| 244 | { |
| 245 | int error; |
| 246 | |
| 247 | error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); |
| 248 | if (error) |
| 249 | aprint_error("%s: unable to register cfattach, error = %d\n" , |
| 250 | vnd_cd.cd_name, error); |
| 251 | } |
| 252 | |
| 253 | static int |
| 254 | vnd_match(device_t self, cfdata_t cfdata, void *aux) |
| 255 | { |
| 256 | |
| 257 | return 1; |
| 258 | } |
| 259 | |
| 260 | static void |
| 261 | vnd_attach(device_t parent, device_t self, void *aux) |
| 262 | { |
| 263 | struct vnd_softc *sc = device_private(self); |
| 264 | |
| 265 | sc->sc_dev = self; |
| 266 | sc->sc_comp_offsets = NULL; |
| 267 | sc->sc_comp_buff = NULL; |
| 268 | sc->sc_comp_decombuf = NULL; |
| 269 | bufq_alloc(&sc->sc_tab, "disksort" , BUFQ_SORT_RAWBLOCK); |
| 270 | disk_init(&sc->sc_dkdev, device_xname(self), &vnddkdriver); |
| 271 | if (!pmf_device_register(self, NULL, NULL)) |
| 272 | aprint_error_dev(self, "couldn't establish power handler\n" ); |
| 273 | } |
| 274 | |
| 275 | static int |
| 276 | vnd_detach(device_t self, int flags) |
| 277 | { |
| 278 | int error; |
| 279 | struct vnd_softc *sc = device_private(self); |
| 280 | |
| 281 | if (sc->sc_flags & VNF_INITED) { |
| 282 | error = vnddoclear(sc, 0, -1, (flags & DETACH_FORCE) != 0); |
| 283 | if (error != 0) |
| 284 | return error; |
| 285 | } |
| 286 | |
| 287 | pmf_device_deregister(self); |
| 288 | bufq_free(sc->sc_tab); |
| 289 | disk_destroy(&sc->sc_dkdev); |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
| 294 | static struct vnd_softc * |
| 295 | vnd_spawn(int unit) |
| 296 | { |
| 297 | cfdata_t cf; |
| 298 | |
| 299 | cf = malloc(sizeof(*cf), M_DEVBUF, M_WAITOK); |
| 300 | cf->cf_name = vnd_cd.cd_name; |
| 301 | cf->cf_atname = vnd_cd.cd_name; |
| 302 | cf->cf_unit = unit; |
| 303 | cf->cf_fstate = FSTATE_STAR; |
| 304 | |
| 305 | return device_private(config_attach_pseudo(cf)); |
| 306 | } |
| 307 | |
| 308 | int |
| 309 | vnd_destroy(device_t dev) |
| 310 | { |
| 311 | int error; |
| 312 | cfdata_t cf; |
| 313 | |
| 314 | cf = device_cfdata(dev); |
| 315 | error = config_detach(dev, DETACH_QUIET); |
| 316 | if (error) |
| 317 | return error; |
| 318 | free(cf, M_DEVBUF); |
| 319 | return 0; |
| 320 | } |
| 321 | |
| 322 | static int |
| 323 | vndopen(dev_t dev, int flags, int mode, struct lwp *l) |
| 324 | { |
| 325 | int unit = vndunit(dev); |
| 326 | struct vnd_softc *sc; |
| 327 | int error = 0, part, pmask; |
| 328 | struct disklabel *lp; |
| 329 | |
| 330 | #ifdef DEBUG |
| 331 | if (vnddebug & VDB_FOLLOW) |
| 332 | printf("vndopen(0x%" PRIx64", 0x%x, 0x%x, %p)\n" , dev, flags, mode, l); |
| 333 | #endif |
| 334 | sc = device_lookup_private(&vnd_cd, unit); |
| 335 | if (sc == NULL) { |
| 336 | sc = vnd_spawn(unit); |
| 337 | if (sc == NULL) |
| 338 | return ENOMEM; |
| 339 | |
| 340 | /* compatibility, keep disklabel after close */ |
| 341 | sc->sc_flags = VNF_KLABEL; |
| 342 | } |
| 343 | |
| 344 | if ((error = vndlock(sc)) != 0) |
| 345 | return error; |
| 346 | |
| 347 | mutex_enter(&sc->sc_dkdev.dk_openlock); |
| 348 | |
| 349 | if ((sc->sc_flags & VNF_CLEARING) != 0) { |
| 350 | error = ENXIO; |
| 351 | goto done; |
| 352 | } |
| 353 | |
| 354 | lp = sc->sc_dkdev.dk_label; |
| 355 | |
| 356 | part = DISKPART(dev); |
| 357 | pmask = (1 << part); |
| 358 | |
| 359 | if (sc->sc_dkdev.dk_nwedges != 0 && part != RAW_PART) { |
| 360 | error = EBUSY; |
| 361 | goto done; |
| 362 | } |
| 363 | |
| 364 | if (sc->sc_flags & VNF_INITED) { |
| 365 | if ((sc->sc_dkdev.dk_openmask & ~(1<<RAW_PART)) != 0) { |
| 366 | /* |
| 367 | * If any non-raw partition is open, but the disk |
| 368 | * has been invalidated, disallow further opens. |
| 369 | */ |
| 370 | if ((sc->sc_flags & VNF_VLABEL) == 0) { |
| 371 | error = EIO; |
| 372 | goto done; |
| 373 | } |
| 374 | } else { |
| 375 | /* |
| 376 | * Load the partition info if not already loaded. |
| 377 | */ |
| 378 | if ((sc->sc_flags & VNF_VLABEL) == 0) { |
| 379 | sc->sc_flags |= VNF_VLABEL; |
| 380 | vndgetdisklabel(dev, sc); |
| 381 | } |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /* Check that the partitions exists. */ |
| 386 | if (part != RAW_PART) { |
| 387 | if (((sc->sc_flags & VNF_INITED) == 0) || |
| 388 | ((part >= lp->d_npartitions) || |
| 389 | (lp->d_partitions[part].p_fstype == FS_UNUSED))) { |
| 390 | error = ENXIO; |
| 391 | goto done; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | /* Prevent our unit from being unconfigured while open. */ |
| 396 | switch (mode) { |
| 397 | case S_IFCHR: |
| 398 | sc->sc_dkdev.dk_copenmask |= pmask; |
| 399 | break; |
| 400 | |
| 401 | case S_IFBLK: |
| 402 | sc->sc_dkdev.dk_bopenmask |= pmask; |
| 403 | break; |
| 404 | } |
| 405 | sc->sc_dkdev.dk_openmask = |
| 406 | sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; |
| 407 | |
| 408 | done: |
| 409 | mutex_exit(&sc->sc_dkdev.dk_openlock); |
| 410 | vndunlock(sc); |
| 411 | return error; |
| 412 | } |
| 413 | |
| 414 | static int |
| 415 | vndclose(dev_t dev, int flags, int mode, struct lwp *l) |
| 416 | { |
| 417 | int unit = vndunit(dev); |
| 418 | struct vnd_softc *sc; |
| 419 | int error = 0, part; |
| 420 | |
| 421 | #ifdef DEBUG |
| 422 | if (vnddebug & VDB_FOLLOW) |
| 423 | printf("vndclose(0x%" PRIx64", 0x%x, 0x%x, %p)\n" , dev, flags, mode, l); |
| 424 | #endif |
| 425 | sc = device_lookup_private(&vnd_cd, unit); |
| 426 | if (sc == NULL) |
| 427 | return ENXIO; |
| 428 | |
| 429 | if ((error = vndlock(sc)) != 0) |
| 430 | return error; |
| 431 | |
| 432 | mutex_enter(&sc->sc_dkdev.dk_openlock); |
| 433 | |
| 434 | part = DISKPART(dev); |
| 435 | |
| 436 | /* ...that much closer to allowing unconfiguration... */ |
| 437 | switch (mode) { |
| 438 | case S_IFCHR: |
| 439 | sc->sc_dkdev.dk_copenmask &= ~(1 << part); |
| 440 | break; |
| 441 | |
| 442 | case S_IFBLK: |
| 443 | sc->sc_dkdev.dk_bopenmask &= ~(1 << part); |
| 444 | break; |
| 445 | } |
| 446 | sc->sc_dkdev.dk_openmask = |
| 447 | sc->sc_dkdev.dk_copenmask | sc->sc_dkdev.dk_bopenmask; |
| 448 | |
| 449 | /* are we last opener ? */ |
| 450 | if (sc->sc_dkdev.dk_openmask == 0) { |
| 451 | if ((sc->sc_flags & VNF_KLABEL) == 0) |
| 452 | sc->sc_flags &= ~VNF_VLABEL; |
| 453 | } |
| 454 | |
| 455 | mutex_exit(&sc->sc_dkdev.dk_openlock); |
| 456 | |
| 457 | vndunlock(sc); |
| 458 | |
| 459 | if ((sc->sc_flags & VNF_INITED) == 0) { |
| 460 | if ((error = vnd_destroy(sc->sc_dev)) != 0) { |
| 461 | aprint_error_dev(sc->sc_dev, |
| 462 | "unable to detach instance\n" ); |
| 463 | return error; |
| 464 | } |
| 465 | } |
| 466 | |
| 467 | return 0; |
| 468 | } |
| 469 | |
| 470 | /* |
| 471 | * Queue the request, and wakeup the kernel thread to handle it. |
| 472 | */ |
| 473 | static void |
| 474 | vndstrategy(struct buf *bp) |
| 475 | { |
| 476 | int unit = vndunit(bp->b_dev); |
| 477 | struct vnd_softc *vnd = |
| 478 | device_lookup_private(&vnd_cd, unit); |
| 479 | struct disklabel *lp; |
| 480 | daddr_t blkno; |
| 481 | int s = splbio(); |
| 482 | |
| 483 | if (vnd == NULL) { |
| 484 | bp->b_error = ENXIO; |
| 485 | goto done; |
| 486 | } |
| 487 | lp = vnd->sc_dkdev.dk_label; |
| 488 | |
| 489 | if ((vnd->sc_flags & VNF_INITED) == 0) { |
| 490 | bp->b_error = ENXIO; |
| 491 | goto done; |
| 492 | } |
| 493 | |
| 494 | /* |
| 495 | * The transfer must be a whole number of blocks. |
| 496 | */ |
| 497 | if ((bp->b_bcount % lp->d_secsize) != 0) { |
| 498 | bp->b_error = EINVAL; |
| 499 | goto done; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * check if we're read-only. |
| 504 | */ |
| 505 | if ((vnd->sc_flags & VNF_READONLY) && !(bp->b_flags & B_READ)) { |
| 506 | bp->b_error = EACCES; |
| 507 | goto done; |
| 508 | } |
| 509 | |
| 510 | /* If it's a nil transfer, wake up the top half now. */ |
| 511 | if (bp->b_bcount == 0) { |
| 512 | goto done; |
| 513 | } |
| 514 | |
| 515 | /* |
| 516 | * Do bounds checking and adjust transfer. If there's an error, |
| 517 | * the bounds check will flag that for us. |
| 518 | */ |
| 519 | if (DISKPART(bp->b_dev) == RAW_PART) { |
| 520 | if (bounds_check_with_mediasize(bp, DEV_BSIZE, |
| 521 | vnd->sc_size) <= 0) |
| 522 | goto done; |
| 523 | } else { |
| 524 | if (bounds_check_with_label(&vnd->sc_dkdev, |
| 525 | bp, vnd->sc_flags & (VNF_WLABEL|VNF_LABELLING)) <= 0) |
| 526 | goto done; |
| 527 | } |
| 528 | |
| 529 | /* |
| 530 | * Put the block number in terms of the logical blocksize |
| 531 | * of the "device". |
| 532 | */ |
| 533 | |
| 534 | blkno = bp->b_blkno / (lp->d_secsize / DEV_BSIZE); |
| 535 | |
| 536 | /* |
| 537 | * Translate the partition-relative block number to an absolute. |
| 538 | */ |
| 539 | if (DISKPART(bp->b_dev) != RAW_PART) { |
| 540 | struct partition *pp; |
| 541 | |
| 542 | pp = &vnd->sc_dkdev.dk_label->d_partitions[ |
| 543 | DISKPART(bp->b_dev)]; |
| 544 | blkno += pp->p_offset; |
| 545 | } |
| 546 | bp->b_rawblkno = blkno; |
| 547 | |
| 548 | #ifdef DEBUG |
| 549 | if (vnddebug & VDB_FOLLOW) |
| 550 | printf("vndstrategy(%p): unit %d\n" , bp, unit); |
| 551 | #endif |
| 552 | if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { |
| 553 | KASSERT(vnd->sc_pending >= 0 && |
| 554 | vnd->sc_pending <= VND_MAXPENDING(vnd)); |
| 555 | while (vnd->sc_pending == VND_MAXPENDING(vnd)) |
| 556 | tsleep(&vnd->sc_pending, PRIBIO, "vndpc" , 0); |
| 557 | vnd->sc_pending++; |
| 558 | } |
| 559 | bufq_put(vnd->sc_tab, bp); |
| 560 | wakeup(&vnd->sc_tab); |
| 561 | splx(s); |
| 562 | return; |
| 563 | |
| 564 | done: |
| 565 | bp->b_resid = bp->b_bcount; |
| 566 | biodone(bp); |
| 567 | splx(s); |
| 568 | } |
| 569 | |
| 570 | static bool |
| 571 | vnode_has_strategy(struct vnd_softc *vnd) |
| 572 | { |
| 573 | return vnode_has_op(vnd->sc_vp, VOFFSET(vop_bmap)) && |
| 574 | vnode_has_op(vnd->sc_vp, VOFFSET(vop_strategy)); |
| 575 | } |
| 576 | |
| 577 | static bool |
| 578 | vnode_has_large_blocks(struct vnd_softc *vnd) |
| 579 | { |
| 580 | u_int32_t vnd_secsize, mnt_secsize; |
| 581 | uint64_t numsec; |
| 582 | unsigned secsize; |
| 583 | |
| 584 | if (getdisksize(vnd->sc_vp, &numsec, &secsize)) |
| 585 | return true; |
| 586 | |
| 587 | vnd_secsize = vnd->sc_geom.vng_secsize; |
| 588 | mnt_secsize = secsize; |
| 589 | |
| 590 | return vnd_secsize % mnt_secsize != 0; |
| 591 | } |
| 592 | |
| 593 | /* XXX this function needs a reliable check to detect |
| 594 | * sparse files. Otherwise, bmap/strategy may be used |
| 595 | * and fail on non-allocated blocks. VOP_READ/VOP_WRITE |
| 596 | * works on sparse files. |
| 597 | */ |
| 598 | #if notyet |
| 599 | static bool |
| 600 | vnode_strategy_probe(struct vnd_softc *vnd) |
| 601 | { |
| 602 | int error; |
| 603 | daddr_t nbn; |
| 604 | |
| 605 | if (!vnode_has_strategy(vnd)) |
| 606 | return false; |
| 607 | |
| 608 | if (vnode_has_large_blocks(vnd)) |
| 609 | return false; |
| 610 | |
| 611 | /* Convert the first logical block number to its |
| 612 | * physical block number. |
| 613 | */ |
| 614 | error = 0; |
| 615 | vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); |
| 616 | error = VOP_BMAP(vnd->sc_vp, 0, NULL, &nbn, NULL); |
| 617 | VOP_UNLOCK(vnd->sc_vp); |
| 618 | |
| 619 | /* Test if that worked. */ |
| 620 | if (error == 0 && (long)nbn == -1) |
| 621 | return false; |
| 622 | |
| 623 | return true; |
| 624 | } |
| 625 | #endif |
| 626 | |
| 627 | static void |
| 628 | vndthread(void *arg) |
| 629 | { |
| 630 | struct vnd_softc *vnd = arg; |
| 631 | int s; |
| 632 | |
| 633 | /* Determine whether we can *use* VOP_BMAP and VOP_STRATEGY to |
| 634 | * directly access the backing vnode. If we can, use these two |
| 635 | * operations to avoid messing with the local buffer cache. |
| 636 | * Otherwise fall back to regular VOP_READ/VOP_WRITE operations |
| 637 | * which are guaranteed to work with any file system. */ |
| 638 | if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0 && |
| 639 | ! vnode_has_strategy(vnd)) |
| 640 | vnd->sc_flags |= VNF_USE_VN_RDWR; |
| 641 | |
| 642 | /* VOP_STRATEGY can only be used if the backing vnode allows |
| 643 | * to access blocks as small as defined by the vnd geometry. |
| 644 | */ |
| 645 | if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0 && |
| 646 | vnode_has_large_blocks(vnd)) |
| 647 | vnd->sc_flags |= VNF_USE_VN_RDWR; |
| 648 | |
| 649 | #ifdef DEBUG |
| 650 | if (vnddebug & VDB_INIT) |
| 651 | printf("vndthread: vp %p, %s\n" , vnd->sc_vp, |
| 652 | (vnd->sc_flags & VNF_USE_VN_RDWR) == 0 ? |
| 653 | "using bmap/strategy operations" : |
| 654 | "using read/write operations" ); |
| 655 | #endif |
| 656 | |
| 657 | s = splbio(); |
| 658 | vnd->sc_flags |= VNF_KTHREAD; |
| 659 | wakeup(&vnd->sc_kthread); |
| 660 | |
| 661 | /* |
| 662 | * Dequeue requests and serve them depending on the available |
| 663 | * vnode operations. |
| 664 | */ |
| 665 | while ((vnd->sc_flags & VNF_VUNCONF) == 0) { |
| 666 | struct vndxfer *vnx; |
| 667 | struct buf *obp; |
| 668 | struct buf *bp; |
| 669 | |
| 670 | obp = bufq_get(vnd->sc_tab); |
| 671 | if (obp == NULL) { |
| 672 | tsleep(&vnd->sc_tab, PRIBIO, "vndbp" , 0); |
| 673 | continue; |
| 674 | }; |
| 675 | if ((vnd->sc_flags & VNF_USE_VN_RDWR)) { |
| 676 | KASSERT(vnd->sc_pending > 0 && |
| 677 | vnd->sc_pending <= VND_MAXPENDING(vnd)); |
| 678 | if (vnd->sc_pending-- == VND_MAXPENDING(vnd)) |
| 679 | wakeup(&vnd->sc_pending); |
| 680 | } |
| 681 | splx(s); |
| 682 | #ifdef DEBUG |
| 683 | if (vnddebug & VDB_FOLLOW) |
| 684 | printf("vndthread(%p)\n" , obp); |
| 685 | #endif |
| 686 | |
| 687 | if (vnd->sc_vp->v_mount == NULL) { |
| 688 | obp->b_error = ENXIO; |
| 689 | goto done; |
| 690 | } |
| 691 | #ifdef VND_COMPRESSION |
| 692 | /* handle a compressed read */ |
| 693 | if ((obp->b_flags & B_READ) != 0 && (vnd->sc_flags & VNF_COMP)) { |
| 694 | off_t bn; |
| 695 | |
| 696 | /* Convert to a byte offset within the file. */ |
| 697 | bn = obp->b_rawblkno * |
| 698 | vnd->sc_dkdev.dk_label->d_secsize; |
| 699 | |
| 700 | compstrategy(obp, bn); |
| 701 | goto done; |
| 702 | } |
| 703 | #endif /* VND_COMPRESSION */ |
| 704 | |
| 705 | /* |
| 706 | * Allocate a header for this transfer and link it to the |
| 707 | * buffer |
| 708 | */ |
| 709 | s = splbio(); |
| 710 | vnx = VND_GETXFER(vnd); |
| 711 | splx(s); |
| 712 | vnx->vx_vnd = vnd; |
| 713 | |
| 714 | s = splbio(); |
| 715 | while (vnd->sc_active >= vnd->sc_maxactive) { |
| 716 | tsleep(&vnd->sc_tab, PRIBIO, "vndac" , 0); |
| 717 | } |
| 718 | vnd->sc_active++; |
| 719 | splx(s); |
| 720 | |
| 721 | /* Instrumentation. */ |
| 722 | disk_busy(&vnd->sc_dkdev); |
| 723 | |
| 724 | bp = &vnx->vx_buf; |
| 725 | buf_init(bp); |
| 726 | bp->b_flags = (obp->b_flags & B_READ); |
| 727 | bp->b_oflags = obp->b_oflags; |
| 728 | bp->b_cflags = obp->b_cflags; |
| 729 | bp->b_iodone = vndiodone; |
| 730 | bp->b_private = obp; |
| 731 | bp->b_vp = vnd->sc_vp; |
| 732 | bp->b_objlock = bp->b_vp->v_interlock; |
| 733 | bp->b_data = obp->b_data; |
| 734 | bp->b_bcount = obp->b_bcount; |
| 735 | BIO_COPYPRIO(bp, obp); |
| 736 | |
| 737 | /* Handle the request using the appropriate operations. */ |
| 738 | if ((vnd->sc_flags & VNF_USE_VN_RDWR) == 0) |
| 739 | handle_with_strategy(vnd, obp, bp); |
| 740 | else |
| 741 | handle_with_rdwr(vnd, obp, bp); |
| 742 | |
| 743 | s = splbio(); |
| 744 | continue; |
| 745 | |
| 746 | done: |
| 747 | biodone(obp); |
| 748 | s = splbio(); |
| 749 | } |
| 750 | |
| 751 | vnd->sc_flags &= (~VNF_KTHREAD | VNF_VUNCONF); |
| 752 | wakeup(&vnd->sc_kthread); |
| 753 | splx(s); |
| 754 | kthread_exit(0); |
| 755 | } |
| 756 | |
| 757 | /* |
| 758 | * Checks if the given vnode supports the requested operation. |
| 759 | * The operation is specified the offset returned by VOFFSET. |
| 760 | * |
| 761 | * XXX The test below used to determine this is quite fragile |
| 762 | * because it relies on the file system to use genfs to specify |
| 763 | * unimplemented operations. There might be another way to do |
| 764 | * it more cleanly. |
| 765 | */ |
| 766 | static bool |
| 767 | vnode_has_op(const struct vnode *vp, int opoffset) |
| 768 | { |
| 769 | int (*defaultp)(void *); |
| 770 | int (*opp)(void *); |
| 771 | |
| 772 | defaultp = vp->v_op[VOFFSET(vop_default)]; |
| 773 | opp = vp->v_op[opoffset]; |
| 774 | |
| 775 | return opp != defaultp && opp != genfs_eopnotsupp && |
| 776 | opp != genfs_badop && opp != genfs_nullop; |
| 777 | } |
| 778 | |
| 779 | /* |
| 780 | * Handles the read/write request given in 'bp' using the vnode's VOP_READ |
| 781 | * and VOP_WRITE operations. |
| 782 | * |
| 783 | * 'obp' is a pointer to the original request fed to the vnd device. |
| 784 | */ |
| 785 | static void |
| 786 | handle_with_rdwr(struct vnd_softc *vnd, const struct buf *obp, struct buf *bp) |
| 787 | { |
| 788 | bool doread; |
| 789 | off_t offset; |
| 790 | size_t len, resid; |
| 791 | struct vnode *vp; |
| 792 | |
| 793 | doread = bp->b_flags & B_READ; |
| 794 | offset = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; |
| 795 | len = bp->b_bcount; |
| 796 | vp = vnd->sc_vp; |
| 797 | |
| 798 | #if defined(DEBUG) |
| 799 | if (vnddebug & VDB_IO) |
| 800 | printf("vnd (rdwr): vp %p, %s, rawblkno 0x%" PRIx64 |
| 801 | ", secsize %d, offset %" PRIu64 |
| 802 | ", bcount %d\n" , |
| 803 | vp, doread ? "read" : "write" , obp->b_rawblkno, |
| 804 | vnd->sc_dkdev.dk_label->d_secsize, offset, |
| 805 | bp->b_bcount); |
| 806 | #endif |
| 807 | |
| 808 | /* Issue the read or write operation. */ |
| 809 | bp->b_error = |
| 810 | vn_rdwr(doread ? UIO_READ : UIO_WRITE, |
| 811 | vp, bp->b_data, len, offset, UIO_SYSSPACE, |
| 812 | IO_ADV_ENCODE(POSIX_FADV_NOREUSE), vnd->sc_cred, &resid, NULL); |
| 813 | bp->b_resid = resid; |
| 814 | |
| 815 | mutex_enter(vp->v_interlock); |
| 816 | (void) VOP_PUTPAGES(vp, 0, 0, |
| 817 | PGO_ALLPAGES | PGO_CLEANIT | PGO_FREE | PGO_SYNCIO); |
| 818 | |
| 819 | /* We need to increase the number of outputs on the vnode if |
| 820 | * there was any write to it. */ |
| 821 | if (!doread) { |
| 822 | mutex_enter(vp->v_interlock); |
| 823 | vp->v_numoutput++; |
| 824 | mutex_exit(vp->v_interlock); |
| 825 | } |
| 826 | |
| 827 | biodone(bp); |
| 828 | } |
| 829 | |
| 830 | /* |
| 831 | * Handes the read/write request given in 'bp' using the vnode's VOP_BMAP |
| 832 | * and VOP_STRATEGY operations. |
| 833 | * |
| 834 | * 'obp' is a pointer to the original request fed to the vnd device. |
| 835 | */ |
| 836 | static void |
| 837 | handle_with_strategy(struct vnd_softc *vnd, const struct buf *obp, |
| 838 | struct buf *bp) |
| 839 | { |
| 840 | int bsize, error, flags, skipped; |
| 841 | size_t resid, sz; |
| 842 | off_t bn, offset; |
| 843 | struct vnode *vp; |
| 844 | struct buf *nbp = NULL; |
| 845 | |
| 846 | flags = obp->b_flags; |
| 847 | |
| 848 | |
| 849 | /* convert to a byte offset within the file. */ |
| 850 | bn = obp->b_rawblkno * vnd->sc_dkdev.dk_label->d_secsize; |
| 851 | |
| 852 | bsize = vnd->sc_vp->v_mount->mnt_stat.f_iosize; |
| 853 | skipped = 0; |
| 854 | |
| 855 | /* |
| 856 | * Break the request into bsize pieces and feed them |
| 857 | * sequentially using VOP_BMAP/VOP_STRATEGY. |
| 858 | * We do it this way to keep from flooding NFS servers if we |
| 859 | * are connected to an NFS file. This places the burden on |
| 860 | * the client rather than the server. |
| 861 | */ |
| 862 | error = 0; |
| 863 | bp->b_resid = bp->b_bcount; |
| 864 | for (offset = 0, resid = bp->b_resid; /* true */; |
| 865 | resid -= sz, offset += sz) { |
| 866 | daddr_t nbn; |
| 867 | int off, nra; |
| 868 | |
| 869 | nra = 0; |
| 870 | vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); |
| 871 | error = VOP_BMAP(vnd->sc_vp, bn / bsize, &vp, &nbn, &nra); |
| 872 | VOP_UNLOCK(vnd->sc_vp); |
| 873 | |
| 874 | if (error == 0 && (long)nbn == -1) |
| 875 | error = EIO; |
| 876 | |
| 877 | /* |
| 878 | * If there was an error or a hole in the file...punt. |
| 879 | * Note that we may have to wait for any operations |
| 880 | * that we have already fired off before releasing |
| 881 | * the buffer. |
| 882 | * |
| 883 | * XXX we could deal with holes here but it would be |
| 884 | * a hassle (in the write case). |
| 885 | */ |
| 886 | if (error) { |
| 887 | skipped += resid; |
| 888 | break; |
| 889 | } |
| 890 | |
| 891 | #ifdef DEBUG |
| 892 | if (!dovndcluster) |
| 893 | nra = 0; |
| 894 | #endif |
| 895 | |
| 896 | off = bn % bsize; |
| 897 | sz = MIN(((off_t)1 + nra) * bsize - off, resid); |
| 898 | #ifdef DEBUG |
| 899 | if (vnddebug & VDB_IO) |
| 900 | printf("vndstrategy: vp %p/%p bn 0x%qx/0x%" PRIx64 |
| 901 | " sz 0x%zx\n" , vnd->sc_vp, vp, (long long)bn, |
| 902 | nbn, sz); |
| 903 | #endif |
| 904 | |
| 905 | nbp = getiobuf(vp, true); |
| 906 | nestiobuf_setup(bp, nbp, offset, sz); |
| 907 | nbp->b_blkno = nbn + btodb(off); |
| 908 | |
| 909 | #if 0 /* XXX #ifdef DEBUG */ |
| 910 | if (vnddebug & VDB_IO) |
| 911 | printf("vndstart(%ld): bp %p vp %p blkno " |
| 912 | "0x%" PRIx64 " flags %x addr %p cnt 0x%x\n" , |
| 913 | (long) (vnd-vnd_softc), &nbp->vb_buf, |
| 914 | nbp->vb_buf.b_vp, nbp->vb_buf.b_blkno, |
| 915 | nbp->vb_buf.b_flags, nbp->vb_buf.b_data, |
| 916 | nbp->vb_buf.b_bcount); |
| 917 | #endif |
| 918 | if (resid == sz) { |
| 919 | break; |
| 920 | } |
| 921 | VOP_STRATEGY(vp, nbp); |
| 922 | bn += sz; |
| 923 | } |
| 924 | if (!(flags & B_READ)) { |
| 925 | struct vnode *w_vp; |
| 926 | /* |
| 927 | * this is the last nested buf, account for |
| 928 | * the parent buf write too. |
| 929 | * This has to be done last, so that |
| 930 | * fsync won't wait for this write which |
| 931 | * has no chance to complete before all nested bufs |
| 932 | * have been queued. But it has to be done |
| 933 | * before the last VOP_STRATEGY() |
| 934 | * or the call to nestiobuf_done(). |
| 935 | */ |
| 936 | w_vp = bp->b_vp; |
| 937 | mutex_enter(w_vp->v_interlock); |
| 938 | w_vp->v_numoutput++; |
| 939 | mutex_exit(w_vp->v_interlock); |
| 940 | } |
| 941 | KASSERT(skipped != 0 || nbp != NULL); |
| 942 | if (skipped) |
| 943 | nestiobuf_done(bp, skipped, error); |
| 944 | else |
| 945 | VOP_STRATEGY(vp, nbp); |
| 946 | } |
| 947 | |
| 948 | static void |
| 949 | vndiodone(struct buf *bp) |
| 950 | { |
| 951 | struct vndxfer *vnx = VND_BUFTOXFER(bp); |
| 952 | struct vnd_softc *vnd = vnx->vx_vnd; |
| 953 | struct buf *obp = bp->b_private; |
| 954 | int s = splbio(); |
| 955 | |
| 956 | KASSERT(&vnx->vx_buf == bp); |
| 957 | KASSERT(vnd->sc_active > 0); |
| 958 | #ifdef DEBUG |
| 959 | if (vnddebug & VDB_IO) { |
| 960 | printf("vndiodone1: bp %p iodone: error %d\n" , |
| 961 | bp, bp->b_error); |
| 962 | } |
| 963 | #endif |
| 964 | disk_unbusy(&vnd->sc_dkdev, bp->b_bcount - bp->b_resid, |
| 965 | (bp->b_flags & B_READ)); |
| 966 | vnd->sc_active--; |
| 967 | if (vnd->sc_active == 0) { |
| 968 | wakeup(&vnd->sc_tab); |
| 969 | } |
| 970 | splx(s); |
| 971 | obp->b_error = bp->b_error; |
| 972 | obp->b_resid = bp->b_resid; |
| 973 | buf_destroy(bp); |
| 974 | VND_PUTXFER(vnd, vnx); |
| 975 | biodone(obp); |
| 976 | } |
| 977 | |
| 978 | /* ARGSUSED */ |
| 979 | static int |
| 980 | vndread(dev_t dev, struct uio *uio, int flags) |
| 981 | { |
| 982 | int unit = vndunit(dev); |
| 983 | struct vnd_softc *sc; |
| 984 | |
| 985 | #ifdef DEBUG |
| 986 | if (vnddebug & VDB_FOLLOW) |
| 987 | printf("vndread(0x%" PRIx64", %p)\n" , dev, uio); |
| 988 | #endif |
| 989 | |
| 990 | sc = device_lookup_private(&vnd_cd, unit); |
| 991 | if (sc == NULL) |
| 992 | return ENXIO; |
| 993 | |
| 994 | if ((sc->sc_flags & VNF_INITED) == 0) |
| 995 | return ENXIO; |
| 996 | |
| 997 | return physio(vndstrategy, NULL, dev, B_READ, minphys, uio); |
| 998 | } |
| 999 | |
| 1000 | /* ARGSUSED */ |
| 1001 | static int |
| 1002 | vndwrite(dev_t dev, struct uio *uio, int flags) |
| 1003 | { |
| 1004 | int unit = vndunit(dev); |
| 1005 | struct vnd_softc *sc; |
| 1006 | |
| 1007 | #ifdef DEBUG |
| 1008 | if (vnddebug & VDB_FOLLOW) |
| 1009 | printf("vndwrite(0x%" PRIx64", %p)\n" , dev, uio); |
| 1010 | #endif |
| 1011 | |
| 1012 | sc = device_lookup_private(&vnd_cd, unit); |
| 1013 | if (sc == NULL) |
| 1014 | return ENXIO; |
| 1015 | |
| 1016 | if ((sc->sc_flags & VNF_INITED) == 0) |
| 1017 | return ENXIO; |
| 1018 | |
| 1019 | return physio(vndstrategy, NULL, dev, B_WRITE, minphys, uio); |
| 1020 | } |
| 1021 | |
| 1022 | static int |
| 1023 | vnd_cget(struct lwp *l, int unit, int *un, struct vattr *va) |
| 1024 | { |
| 1025 | int error; |
| 1026 | struct vnd_softc *vnd; |
| 1027 | |
| 1028 | if (*un == -1) |
| 1029 | *un = unit; |
| 1030 | if (*un < 0) |
| 1031 | return EINVAL; |
| 1032 | |
| 1033 | vnd = device_lookup_private(&vnd_cd, *un); |
| 1034 | if (vnd == NULL) |
| 1035 | return -1; |
| 1036 | |
| 1037 | if ((vnd->sc_flags & VNF_INITED) == 0) |
| 1038 | return -1; |
| 1039 | |
| 1040 | vn_lock(vnd->sc_vp, LK_SHARED | LK_RETRY); |
| 1041 | error = VOP_GETATTR(vnd->sc_vp, va, l->l_cred); |
| 1042 | VOP_UNLOCK(vnd->sc_vp); |
| 1043 | return error; |
| 1044 | } |
| 1045 | |
| 1046 | static int |
| 1047 | vnddoclear(struct vnd_softc *vnd, int pmask, int minor, bool force) |
| 1048 | { |
| 1049 | int error; |
| 1050 | |
| 1051 | if ((error = vndlock(vnd)) != 0) |
| 1052 | return error; |
| 1053 | |
| 1054 | /* |
| 1055 | * Don't unconfigure if any other partitions are open |
| 1056 | * or if both the character and block flavors of this |
| 1057 | * partition are open. |
| 1058 | */ |
| 1059 | if (DK_BUSY(vnd, pmask) && !force) { |
| 1060 | vndunlock(vnd); |
| 1061 | return EBUSY; |
| 1062 | } |
| 1063 | |
| 1064 | /* Delete all of our wedges */ |
| 1065 | dkwedge_delall(&vnd->sc_dkdev); |
| 1066 | |
| 1067 | /* |
| 1068 | * XXX vndclear() might call vndclose() implicitly; |
| 1069 | * release lock to avoid recursion |
| 1070 | * |
| 1071 | * Set VNF_CLEARING to prevent vndopen() from |
| 1072 | * sneaking in after we vndunlock(). |
| 1073 | */ |
| 1074 | vnd->sc_flags |= VNF_CLEARING; |
| 1075 | vndunlock(vnd); |
| 1076 | vndclear(vnd, minor); |
| 1077 | #ifdef DEBUG |
| 1078 | if (vnddebug & VDB_INIT) |
| 1079 | printf("%s: CLRed\n" , __func__); |
| 1080 | #endif |
| 1081 | |
| 1082 | /* Destroy the xfer and buffer pools. */ |
| 1083 | pool_destroy(&vnd->sc_vxpool); |
| 1084 | |
| 1085 | /* Detach the disk. */ |
| 1086 | disk_detach(&vnd->sc_dkdev); |
| 1087 | |
| 1088 | return 0; |
| 1089 | } |
| 1090 | |
| 1091 | static int |
| 1092 | vndioctl_get(struct lwp *l, void *data, int unit, struct vattr *va) |
| 1093 | { |
| 1094 | int error; |
| 1095 | |
| 1096 | KASSERT(l); |
| 1097 | |
| 1098 | /* the first member is always int vnd_unit in all the versions */ |
| 1099 | if (*(int *)data >= vnd_cd.cd_ndevs) |
| 1100 | return ENXIO; |
| 1101 | |
| 1102 | switch (error = vnd_cget(l, unit, (int *)data, va)) { |
| 1103 | case -1: |
| 1104 | /* unused is not an error */ |
| 1105 | memset(va, 0, sizeof(*va)); |
| 1106 | /*FALLTHROUGH*/ |
| 1107 | case 0: |
| 1108 | return 0; |
| 1109 | default: |
| 1110 | return error; |
| 1111 | } |
| 1112 | } |
| 1113 | |
| 1114 | /* ARGSUSED */ |
| 1115 | static int |
| 1116 | vndioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) |
| 1117 | { |
| 1118 | bool force; |
| 1119 | int unit = vndunit(dev); |
| 1120 | struct vnd_softc *vnd; |
| 1121 | struct vnd_ioctl *vio; |
| 1122 | struct vattr vattr; |
| 1123 | struct pathbuf *pb; |
| 1124 | struct nameidata nd; |
| 1125 | int error, part, pmask; |
| 1126 | uint64_t geomsize; |
| 1127 | int fflags; |
| 1128 | #ifdef __HAVE_OLD_DISKLABEL |
| 1129 | struct disklabel newlabel; |
| 1130 | #endif |
| 1131 | |
| 1132 | #ifdef DEBUG |
| 1133 | if (vnddebug & VDB_FOLLOW) |
| 1134 | printf("vndioctl(0x%" PRIx64", 0x%lx, %p, 0x%x, %p): unit %d\n" , |
| 1135 | dev, cmd, data, flag, l->l_proc, unit); |
| 1136 | #endif |
| 1137 | /* Do the get's first; they don't need initialization or verification */ |
| 1138 | switch (cmd) { |
| 1139 | #ifdef COMPAT_30 |
| 1140 | case VNDIOCGET30: { |
| 1141 | if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) |
| 1142 | return error; |
| 1143 | |
| 1144 | struct vnd_user30 *vnu = data; |
| 1145 | vnu->vnu_dev = vattr.va_fsid; |
| 1146 | vnu->vnu_ino = vattr.va_fileid; |
| 1147 | return 0; |
| 1148 | } |
| 1149 | #endif |
| 1150 | #ifdef COMPAT_50 |
| 1151 | case VNDIOCGET50: { |
| 1152 | if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) |
| 1153 | return error; |
| 1154 | |
| 1155 | struct vnd_user50 *vnu = data; |
| 1156 | vnu->vnu_dev = vattr.va_fsid; |
| 1157 | vnu->vnu_ino = vattr.va_fileid; |
| 1158 | return 0; |
| 1159 | } |
| 1160 | #endif |
| 1161 | |
| 1162 | case VNDIOCGET: { |
| 1163 | if ((error = vndioctl_get(l, data, unit, &vattr)) != 0) |
| 1164 | return error; |
| 1165 | |
| 1166 | struct vnd_user *vnu = data; |
| 1167 | vnu->vnu_dev = vattr.va_fsid; |
| 1168 | vnu->vnu_ino = vattr.va_fileid; |
| 1169 | return 0; |
| 1170 | } |
| 1171 | default: |
| 1172 | break; |
| 1173 | } |
| 1174 | |
| 1175 | vnd = device_lookup_private(&vnd_cd, unit); |
| 1176 | if (vnd == NULL) |
| 1177 | return ENXIO; |
| 1178 | vio = (struct vnd_ioctl *)data; |
| 1179 | |
| 1180 | /* Must be open for writes for these commands... */ |
| 1181 | switch (cmd) { |
| 1182 | case VNDIOCSET: |
| 1183 | case VNDIOCCLR: |
| 1184 | #ifdef COMPAT_50 |
| 1185 | case VNDIOCSET50: |
| 1186 | case VNDIOCCLR50: |
| 1187 | #endif |
| 1188 | case DIOCSDINFO: |
| 1189 | case DIOCWDINFO: |
| 1190 | #ifdef __HAVE_OLD_DISKLABEL |
| 1191 | case ODIOCSDINFO: |
| 1192 | case ODIOCWDINFO: |
| 1193 | #endif |
| 1194 | case DIOCKLABEL: |
| 1195 | case DIOCWLABEL: |
| 1196 | if ((flag & FWRITE) == 0) |
| 1197 | return EBADF; |
| 1198 | } |
| 1199 | |
| 1200 | /* Must be initialized for these... */ |
| 1201 | switch (cmd) { |
| 1202 | case VNDIOCCLR: |
| 1203 | #ifdef VNDIOCCLR50 |
| 1204 | case VNDIOCCLR50: |
| 1205 | #endif |
| 1206 | case DIOCGDINFO: |
| 1207 | case DIOCSDINFO: |
| 1208 | case DIOCWDINFO: |
| 1209 | case DIOCGPARTINFO: |
| 1210 | case DIOCKLABEL: |
| 1211 | case DIOCWLABEL: |
| 1212 | case DIOCGDEFLABEL: |
| 1213 | case DIOCCACHESYNC: |
| 1214 | #ifdef __HAVE_OLD_DISKLABEL |
| 1215 | case ODIOCGDINFO: |
| 1216 | case ODIOCSDINFO: |
| 1217 | case ODIOCWDINFO: |
| 1218 | case ODIOCGDEFLABEL: |
| 1219 | #endif |
| 1220 | if ((vnd->sc_flags & VNF_INITED) == 0) |
| 1221 | return ENXIO; |
| 1222 | } |
| 1223 | |
| 1224 | error = disk_ioctl(&vnd->sc_dkdev, dev, cmd, data, flag, l); |
| 1225 | if (error != EPASSTHROUGH) |
| 1226 | return error; |
| 1227 | |
| 1228 | |
| 1229 | switch (cmd) { |
| 1230 | #ifdef VNDIOCSET50 |
| 1231 | case VNDIOCSET50: |
| 1232 | #endif |
| 1233 | case VNDIOCSET: |
| 1234 | if (vnd->sc_flags & VNF_INITED) |
| 1235 | return EBUSY; |
| 1236 | |
| 1237 | if ((error = vndlock(vnd)) != 0) |
| 1238 | return error; |
| 1239 | |
| 1240 | fflags = FREAD; |
| 1241 | if ((vio->vnd_flags & VNDIOF_READONLY) == 0) |
| 1242 | fflags |= FWRITE; |
| 1243 | error = pathbuf_copyin(vio->vnd_file, &pb); |
| 1244 | if (error) { |
| 1245 | goto unlock_and_exit; |
| 1246 | } |
| 1247 | NDINIT(&nd, LOOKUP, FOLLOW, pb); |
| 1248 | if ((error = vn_open(&nd, fflags, 0)) != 0) { |
| 1249 | pathbuf_destroy(pb); |
| 1250 | goto unlock_and_exit; |
| 1251 | } |
| 1252 | KASSERT(l); |
| 1253 | error = VOP_GETATTR(nd.ni_vp, &vattr, l->l_cred); |
| 1254 | if (!error && nd.ni_vp->v_type != VREG) |
| 1255 | error = EOPNOTSUPP; |
| 1256 | if (!error && vattr.va_bytes < vattr.va_size) |
| 1257 | /* File is definitely sparse, use vn_rdwr() */ |
| 1258 | vnd->sc_flags |= VNF_USE_VN_RDWR; |
| 1259 | if (error) { |
| 1260 | VOP_UNLOCK(nd.ni_vp); |
| 1261 | goto close_and_exit; |
| 1262 | } |
| 1263 | |
| 1264 | /* If using a compressed file, initialize its info */ |
| 1265 | /* (or abort with an error if kernel has no compression) */ |
| 1266 | if (vio->vnd_flags & VNF_COMP) { |
| 1267 | #ifdef VND_COMPRESSION |
| 1268 | struct vnd_comp_header *ch; |
| 1269 | int i; |
| 1270 | u_int32_t comp_size; |
| 1271 | u_int32_t comp_maxsize; |
| 1272 | |
| 1273 | /* allocate space for compresed file header */ |
| 1274 | ch = malloc(sizeof(struct vnd_comp_header), |
| 1275 | M_TEMP, M_WAITOK); |
| 1276 | |
| 1277 | /* read compressed file header */ |
| 1278 | error = vn_rdwr(UIO_READ, nd.ni_vp, (void *)ch, |
| 1279 | sizeof(struct vnd_comp_header), 0, UIO_SYSSPACE, |
| 1280 | IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); |
| 1281 | if (error) { |
| 1282 | free(ch, M_TEMP); |
| 1283 | VOP_UNLOCK(nd.ni_vp); |
| 1284 | goto close_and_exit; |
| 1285 | } |
| 1286 | |
| 1287 | /* save some header info */ |
| 1288 | vnd->sc_comp_blksz = ntohl(ch->block_size); |
| 1289 | /* note last offset is the file byte size */ |
| 1290 | vnd->sc_comp_numoffs = ntohl(ch->num_blocks)+1; |
| 1291 | free(ch, M_TEMP); |
| 1292 | if (!DK_DEV_BSIZE_OK(vnd->sc_comp_blksz)) { |
| 1293 | VOP_UNLOCK(nd.ni_vp); |
| 1294 | error = EINVAL; |
| 1295 | goto close_and_exit; |
| 1296 | } |
| 1297 | if (sizeof(struct vnd_comp_header) + |
| 1298 | sizeof(u_int64_t) * vnd->sc_comp_numoffs > |
| 1299 | vattr.va_size) { |
| 1300 | VOP_UNLOCK(nd.ni_vp); |
| 1301 | error = EINVAL; |
| 1302 | goto close_and_exit; |
| 1303 | } |
| 1304 | |
| 1305 | /* set decompressed file size */ |
| 1306 | vattr.va_size = |
| 1307 | ((u_quad_t)vnd->sc_comp_numoffs - 1) * |
| 1308 | (u_quad_t)vnd->sc_comp_blksz; |
| 1309 | |
| 1310 | /* allocate space for all the compressed offsets */ |
| 1311 | vnd->sc_comp_offsets = |
| 1312 | malloc(sizeof(u_int64_t) * vnd->sc_comp_numoffs, |
| 1313 | M_DEVBUF, M_WAITOK); |
| 1314 | |
| 1315 | /* read in the offsets */ |
| 1316 | error = vn_rdwr(UIO_READ, nd.ni_vp, |
| 1317 | (void *)vnd->sc_comp_offsets, |
| 1318 | sizeof(u_int64_t) * vnd->sc_comp_numoffs, |
| 1319 | sizeof(struct vnd_comp_header), UIO_SYSSPACE, |
| 1320 | IO_UNIT|IO_NODELOCKED, l->l_cred, NULL, NULL); |
| 1321 | if (error) { |
| 1322 | VOP_UNLOCK(nd.ni_vp); |
| 1323 | goto close_and_exit; |
| 1324 | } |
| 1325 | /* |
| 1326 | * find largest block size (used for allocation limit). |
| 1327 | * Also convert offset to native byte order. |
| 1328 | */ |
| 1329 | comp_maxsize = 0; |
| 1330 | for (i = 0; i < vnd->sc_comp_numoffs - 1; i++) { |
| 1331 | vnd->sc_comp_offsets[i] = |
| 1332 | be64toh(vnd->sc_comp_offsets[i]); |
| 1333 | comp_size = be64toh(vnd->sc_comp_offsets[i + 1]) |
| 1334 | - vnd->sc_comp_offsets[i]; |
| 1335 | if (comp_size > comp_maxsize) |
| 1336 | comp_maxsize = comp_size; |
| 1337 | } |
| 1338 | vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1] = |
| 1339 | be64toh(vnd->sc_comp_offsets[vnd->sc_comp_numoffs - 1]); |
| 1340 | |
| 1341 | /* create compressed data buffer */ |
| 1342 | vnd->sc_comp_buff = malloc(comp_maxsize, |
| 1343 | M_DEVBUF, M_WAITOK); |
| 1344 | |
| 1345 | /* create decompressed buffer */ |
| 1346 | vnd->sc_comp_decombuf = malloc(vnd->sc_comp_blksz, |
| 1347 | M_DEVBUF, M_WAITOK); |
| 1348 | vnd->sc_comp_buffblk = -1; |
| 1349 | |
| 1350 | /* Initialize decompress stream */ |
| 1351 | memset(&vnd->sc_comp_stream, 0, sizeof(z_stream)); |
| 1352 | vnd->sc_comp_stream.zalloc = vnd_alloc; |
| 1353 | vnd->sc_comp_stream.zfree = vnd_free; |
| 1354 | error = inflateInit2(&vnd->sc_comp_stream, MAX_WBITS); |
| 1355 | if (error) { |
| 1356 | if (vnd->sc_comp_stream.msg) |
| 1357 | printf("vnd%d: compressed file, %s\n" , |
| 1358 | unit, vnd->sc_comp_stream.msg); |
| 1359 | VOP_UNLOCK(nd.ni_vp); |
| 1360 | error = EINVAL; |
| 1361 | goto close_and_exit; |
| 1362 | } |
| 1363 | |
| 1364 | vnd->sc_flags |= VNF_COMP | VNF_READONLY; |
| 1365 | #else /* !VND_COMPRESSION */ |
| 1366 | VOP_UNLOCK(nd.ni_vp); |
| 1367 | error = EOPNOTSUPP; |
| 1368 | goto close_and_exit; |
| 1369 | #endif /* VND_COMPRESSION */ |
| 1370 | } |
| 1371 | |
| 1372 | VOP_UNLOCK(nd.ni_vp); |
| 1373 | vnd->sc_vp = nd.ni_vp; |
| 1374 | vnd->sc_size = btodb(vattr.va_size); /* note truncation */ |
| 1375 | |
| 1376 | /* |
| 1377 | * Use pseudo-geometry specified. If none was provided, |
| 1378 | * use "standard" Adaptec fictitious geometry. |
| 1379 | */ |
| 1380 | if (vio->vnd_flags & VNDIOF_HASGEOM) { |
| 1381 | |
| 1382 | memcpy(&vnd->sc_geom, &vio->vnd_geom, |
| 1383 | sizeof(vio->vnd_geom)); |
| 1384 | |
| 1385 | /* |
| 1386 | * Sanity-check the sector size. |
| 1387 | */ |
| 1388 | if (!DK_DEV_BSIZE_OK(vnd->sc_geom.vng_secsize) || |
| 1389 | vnd->sc_geom.vng_ncylinders == 0 || |
| 1390 | vnd->sc_geom.vng_ntracks == 0 || |
| 1391 | vnd->sc_geom.vng_nsectors == 0) { |
| 1392 | error = EINVAL; |
| 1393 | goto close_and_exit; |
| 1394 | } |
| 1395 | |
| 1396 | /* |
| 1397 | * Compute the size (in DEV_BSIZE blocks) specified |
| 1398 | * by the geometry. |
| 1399 | */ |
| 1400 | geomsize = (int64_t)vnd->sc_geom.vng_nsectors * |
| 1401 | vnd->sc_geom.vng_ntracks * |
| 1402 | vnd->sc_geom.vng_ncylinders * |
| 1403 | (vnd->sc_geom.vng_secsize / DEV_BSIZE); |
| 1404 | |
| 1405 | /* |
| 1406 | * Sanity-check the size against the specified |
| 1407 | * geometry. |
| 1408 | */ |
| 1409 | if (vnd->sc_size < geomsize) { |
| 1410 | error = EINVAL; |
| 1411 | goto close_and_exit; |
| 1412 | } |
| 1413 | } else if (vnd->sc_size >= (32 * 64)) { |
| 1414 | /* |
| 1415 | * Size must be at least 2048 DEV_BSIZE blocks |
| 1416 | * (1M) in order to use this geometry. |
| 1417 | */ |
| 1418 | vnd->sc_geom.vng_secsize = DEV_BSIZE; |
| 1419 | vnd->sc_geom.vng_nsectors = 32; |
| 1420 | vnd->sc_geom.vng_ntracks = 64; |
| 1421 | vnd->sc_geom.vng_ncylinders = vnd->sc_size / (64 * 32); |
| 1422 | } else { |
| 1423 | vnd->sc_geom.vng_secsize = DEV_BSIZE; |
| 1424 | vnd->sc_geom.vng_nsectors = 1; |
| 1425 | vnd->sc_geom.vng_ntracks = 1; |
| 1426 | vnd->sc_geom.vng_ncylinders = vnd->sc_size; |
| 1427 | } |
| 1428 | |
| 1429 | vnd_set_geometry(vnd); |
| 1430 | |
| 1431 | if (vio->vnd_flags & VNDIOF_READONLY) { |
| 1432 | vnd->sc_flags |= VNF_READONLY; |
| 1433 | } |
| 1434 | |
| 1435 | if ((error = vndsetcred(vnd, l->l_cred)) != 0) |
| 1436 | goto close_and_exit; |
| 1437 | |
| 1438 | vndthrottle(vnd, vnd->sc_vp); |
| 1439 | vio->vnd_osize = dbtob(vnd->sc_size); |
| 1440 | #ifdef VNDIOCSET50 |
| 1441 | if (cmd != VNDIOCSET50) |
| 1442 | #endif |
| 1443 | vio->vnd_size = dbtob(vnd->sc_size); |
| 1444 | vnd->sc_flags |= VNF_INITED; |
| 1445 | |
| 1446 | /* create the kernel thread, wait for it to be up */ |
| 1447 | error = kthread_create(PRI_NONE, 0, NULL, vndthread, vnd, |
| 1448 | &vnd->sc_kthread, "%s" , device_xname(vnd->sc_dev)); |
| 1449 | if (error) |
| 1450 | goto close_and_exit; |
| 1451 | while ((vnd->sc_flags & VNF_KTHREAD) == 0) { |
| 1452 | tsleep(&vnd->sc_kthread, PRIBIO, "vndthr" , 0); |
| 1453 | } |
| 1454 | #ifdef DEBUG |
| 1455 | if (vnddebug & VDB_INIT) |
| 1456 | printf("vndioctl: SET vp %p size 0x%lx %d/%d/%d/%d\n" , |
| 1457 | vnd->sc_vp, (unsigned long) vnd->sc_size, |
| 1458 | vnd->sc_geom.vng_secsize, |
| 1459 | vnd->sc_geom.vng_nsectors, |
| 1460 | vnd->sc_geom.vng_ntracks, |
| 1461 | vnd->sc_geom.vng_ncylinders); |
| 1462 | #endif |
| 1463 | |
| 1464 | /* Attach the disk. */ |
| 1465 | disk_attach(&vnd->sc_dkdev); |
| 1466 | |
| 1467 | /* Initialize the xfer and buffer pools. */ |
| 1468 | pool_init(&vnd->sc_vxpool, sizeof(struct vndxfer), 0, |
| 1469 | 0, 0, "vndxpl" , NULL, IPL_BIO); |
| 1470 | |
| 1471 | vndunlock(vnd); |
| 1472 | |
| 1473 | pathbuf_destroy(pb); |
| 1474 | |
| 1475 | /* Discover wedges on this disk */ |
| 1476 | dkwedge_discover(&vnd->sc_dkdev); |
| 1477 | |
| 1478 | break; |
| 1479 | |
| 1480 | close_and_exit: |
| 1481 | (void) vn_close(nd.ni_vp, fflags, l->l_cred); |
| 1482 | pathbuf_destroy(pb); |
| 1483 | unlock_and_exit: |
| 1484 | #ifdef VND_COMPRESSION |
| 1485 | /* free any allocated memory (for compressed file) */ |
| 1486 | if (vnd->sc_comp_offsets) { |
| 1487 | free(vnd->sc_comp_offsets, M_DEVBUF); |
| 1488 | vnd->sc_comp_offsets = NULL; |
| 1489 | } |
| 1490 | if (vnd->sc_comp_buff) { |
| 1491 | free(vnd->sc_comp_buff, M_DEVBUF); |
| 1492 | vnd->sc_comp_buff = NULL; |
| 1493 | } |
| 1494 | if (vnd->sc_comp_decombuf) { |
| 1495 | free(vnd->sc_comp_decombuf, M_DEVBUF); |
| 1496 | vnd->sc_comp_decombuf = NULL; |
| 1497 | } |
| 1498 | #endif /* VND_COMPRESSION */ |
| 1499 | vndunlock(vnd); |
| 1500 | return error; |
| 1501 | |
| 1502 | #ifdef VNDIOCCLR50 |
| 1503 | case VNDIOCCLR50: |
| 1504 | #endif |
| 1505 | case VNDIOCCLR: |
| 1506 | part = DISKPART(dev); |
| 1507 | pmask = (1 << part); |
| 1508 | force = (vio->vnd_flags & VNDIOF_FORCE) != 0; |
| 1509 | |
| 1510 | if ((error = vnddoclear(vnd, pmask, minor(dev), force)) != 0) |
| 1511 | return error; |
| 1512 | |
| 1513 | break; |
| 1514 | |
| 1515 | |
| 1516 | case DIOCWDINFO: |
| 1517 | case DIOCSDINFO: |
| 1518 | #ifdef __HAVE_OLD_DISKLABEL |
| 1519 | case ODIOCWDINFO: |
| 1520 | case ODIOCSDINFO: |
| 1521 | #endif |
| 1522 | { |
| 1523 | struct disklabel *lp; |
| 1524 | |
| 1525 | if ((error = vndlock(vnd)) != 0) |
| 1526 | return error; |
| 1527 | |
| 1528 | vnd->sc_flags |= VNF_LABELLING; |
| 1529 | |
| 1530 | #ifdef __HAVE_OLD_DISKLABEL |
| 1531 | if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { |
| 1532 | memset(&newlabel, 0, sizeof newlabel); |
| 1533 | memcpy(&newlabel, data, sizeof (struct olddisklabel)); |
| 1534 | lp = &newlabel; |
| 1535 | } else |
| 1536 | #endif |
| 1537 | lp = (struct disklabel *)data; |
| 1538 | |
| 1539 | error = setdisklabel(vnd->sc_dkdev.dk_label, |
| 1540 | lp, 0, vnd->sc_dkdev.dk_cpulabel); |
| 1541 | if (error == 0) { |
| 1542 | if (cmd == DIOCWDINFO |
| 1543 | #ifdef __HAVE_OLD_DISKLABEL |
| 1544 | || cmd == ODIOCWDINFO |
| 1545 | #endif |
| 1546 | ) |
| 1547 | error = writedisklabel(VNDLABELDEV(dev), |
| 1548 | vndstrategy, vnd->sc_dkdev.dk_label, |
| 1549 | vnd->sc_dkdev.dk_cpulabel); |
| 1550 | } |
| 1551 | |
| 1552 | vnd->sc_flags &= ~VNF_LABELLING; |
| 1553 | |
| 1554 | vndunlock(vnd); |
| 1555 | |
| 1556 | if (error) |
| 1557 | return error; |
| 1558 | break; |
| 1559 | } |
| 1560 | |
| 1561 | case DIOCKLABEL: |
| 1562 | if (*(int *)data != 0) |
| 1563 | vnd->sc_flags |= VNF_KLABEL; |
| 1564 | else |
| 1565 | vnd->sc_flags &= ~VNF_KLABEL; |
| 1566 | break; |
| 1567 | |
| 1568 | case DIOCWLABEL: |
| 1569 | if (*(int *)data != 0) |
| 1570 | vnd->sc_flags |= VNF_WLABEL; |
| 1571 | else |
| 1572 | vnd->sc_flags &= ~VNF_WLABEL; |
| 1573 | break; |
| 1574 | |
| 1575 | case DIOCGDEFLABEL: |
| 1576 | vndgetdefaultlabel(vnd, (struct disklabel *)data); |
| 1577 | break; |
| 1578 | |
| 1579 | #ifdef __HAVE_OLD_DISKLABEL |
| 1580 | case ODIOCGDEFLABEL: |
| 1581 | vndgetdefaultlabel(vnd, &newlabel); |
| 1582 | if (newlabel.d_npartitions > OLDMAXPARTITIONS) |
| 1583 | return ENOTTY; |
| 1584 | memcpy(data, &newlabel, sizeof (struct olddisklabel)); |
| 1585 | break; |
| 1586 | #endif |
| 1587 | |
| 1588 | case DIOCCACHESYNC: |
| 1589 | vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); |
| 1590 | error = VOP_FSYNC(vnd->sc_vp, vnd->sc_cred, |
| 1591 | FSYNC_WAIT | FSYNC_DATAONLY | FSYNC_CACHE, 0, 0); |
| 1592 | VOP_UNLOCK(vnd->sc_vp); |
| 1593 | return error; |
| 1594 | |
| 1595 | default: |
| 1596 | return ENOTTY; |
| 1597 | } |
| 1598 | |
| 1599 | return 0; |
| 1600 | } |
| 1601 | |
| 1602 | /* |
| 1603 | * Duplicate the current processes' credentials. Since we are called only |
| 1604 | * as the result of a SET ioctl and only root can do that, any future access |
| 1605 | * to this "disk" is essentially as root. Note that credentials may change |
| 1606 | * if some other uid can write directly to the mapped file (NFS). |
| 1607 | */ |
| 1608 | static int |
| 1609 | vndsetcred(struct vnd_softc *vnd, kauth_cred_t cred) |
| 1610 | { |
| 1611 | struct uio auio; |
| 1612 | struct iovec aiov; |
| 1613 | char *tmpbuf; |
| 1614 | int error; |
| 1615 | |
| 1616 | vnd->sc_cred = kauth_cred_dup(cred); |
| 1617 | tmpbuf = malloc(DEV_BSIZE, M_TEMP, M_WAITOK); |
| 1618 | |
| 1619 | /* XXX: Horrible kludge to establish credentials for NFS */ |
| 1620 | aiov.iov_base = tmpbuf; |
| 1621 | aiov.iov_len = min(DEV_BSIZE, dbtob(vnd->sc_size)); |
| 1622 | auio.uio_iov = &aiov; |
| 1623 | auio.uio_iovcnt = 1; |
| 1624 | auio.uio_offset = 0; |
| 1625 | auio.uio_rw = UIO_READ; |
| 1626 | auio.uio_resid = aiov.iov_len; |
| 1627 | UIO_SETUP_SYSSPACE(&auio); |
| 1628 | vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); |
| 1629 | error = VOP_READ(vnd->sc_vp, &auio, 0, vnd->sc_cred); |
| 1630 | if (error == 0) { |
| 1631 | /* |
| 1632 | * Because vnd does all IO directly through the vnode |
| 1633 | * we need to flush (at least) the buffer from the above |
| 1634 | * VOP_READ from the buffer cache to prevent cache |
| 1635 | * incoherencies. Also, be careful to write dirty |
| 1636 | * buffers back to stable storage. |
| 1637 | */ |
| 1638 | error = vinvalbuf(vnd->sc_vp, V_SAVE, vnd->sc_cred, |
| 1639 | curlwp, 0, 0); |
| 1640 | } |
| 1641 | VOP_UNLOCK(vnd->sc_vp); |
| 1642 | |
| 1643 | free(tmpbuf, M_TEMP); |
| 1644 | return error; |
| 1645 | } |
| 1646 | |
| 1647 | /* |
| 1648 | * Set maxactive based on FS type |
| 1649 | */ |
| 1650 | static void |
| 1651 | vndthrottle(struct vnd_softc *vnd, struct vnode *vp) |
| 1652 | { |
| 1653 | |
| 1654 | if (vp->v_tag == VT_NFS) |
| 1655 | vnd->sc_maxactive = 2; |
| 1656 | else |
| 1657 | vnd->sc_maxactive = 8; |
| 1658 | |
| 1659 | if (vnd->sc_maxactive < 1) |
| 1660 | vnd->sc_maxactive = 1; |
| 1661 | } |
| 1662 | |
| 1663 | #if 0 |
| 1664 | static void |
| 1665 | vndshutdown(void) |
| 1666 | { |
| 1667 | struct vnd_softc *vnd; |
| 1668 | |
| 1669 | for (vnd = &vnd_softc[0]; vnd < &vnd_softc[numvnd]; vnd++) |
| 1670 | if (vnd->sc_flags & VNF_INITED) |
| 1671 | vndclear(vnd); |
| 1672 | } |
| 1673 | #endif |
| 1674 | |
| 1675 | static void |
| 1676 | vndclear(struct vnd_softc *vnd, int myminor) |
| 1677 | { |
| 1678 | struct vnode *vp = vnd->sc_vp; |
| 1679 | int fflags = FREAD; |
| 1680 | int bmaj, cmaj, i, mn; |
| 1681 | int s; |
| 1682 | |
| 1683 | #ifdef DEBUG |
| 1684 | if (vnddebug & VDB_FOLLOW) |
| 1685 | printf("vndclear(%p): vp %p\n" , vnd, vp); |
| 1686 | #endif |
| 1687 | /* locate the major number */ |
| 1688 | bmaj = bdevsw_lookup_major(&vnd_bdevsw); |
| 1689 | cmaj = cdevsw_lookup_major(&vnd_cdevsw); |
| 1690 | |
| 1691 | /* Nuke the vnodes for any open instances */ |
| 1692 | for (i = 0; i < MAXPARTITIONS; i++) { |
| 1693 | mn = DISKMINOR(device_unit(vnd->sc_dev), i); |
| 1694 | vdevgone(bmaj, mn, mn, VBLK); |
| 1695 | if (mn != myminor) /* XXX avoid to kill own vnode */ |
| 1696 | vdevgone(cmaj, mn, mn, VCHR); |
| 1697 | } |
| 1698 | |
| 1699 | if ((vnd->sc_flags & VNF_READONLY) == 0) |
| 1700 | fflags |= FWRITE; |
| 1701 | |
| 1702 | s = splbio(); |
| 1703 | bufq_drain(vnd->sc_tab); |
| 1704 | splx(s); |
| 1705 | |
| 1706 | vnd->sc_flags |= VNF_VUNCONF; |
| 1707 | wakeup(&vnd->sc_tab); |
| 1708 | while (vnd->sc_flags & VNF_KTHREAD) |
| 1709 | tsleep(&vnd->sc_kthread, PRIBIO, "vnthr" , 0); |
| 1710 | |
| 1711 | #ifdef VND_COMPRESSION |
| 1712 | /* free the compressed file buffers */ |
| 1713 | if (vnd->sc_flags & VNF_COMP) { |
| 1714 | if (vnd->sc_comp_offsets) { |
| 1715 | free(vnd->sc_comp_offsets, M_DEVBUF); |
| 1716 | vnd->sc_comp_offsets = NULL; |
| 1717 | } |
| 1718 | if (vnd->sc_comp_buff) { |
| 1719 | free(vnd->sc_comp_buff, M_DEVBUF); |
| 1720 | vnd->sc_comp_buff = NULL; |
| 1721 | } |
| 1722 | if (vnd->sc_comp_decombuf) { |
| 1723 | free(vnd->sc_comp_decombuf, M_DEVBUF); |
| 1724 | vnd->sc_comp_decombuf = NULL; |
| 1725 | } |
| 1726 | } |
| 1727 | #endif /* VND_COMPRESSION */ |
| 1728 | vnd->sc_flags &= |
| 1729 | ~(VNF_INITED | VNF_READONLY | VNF_KLABEL | VNF_VLABEL |
| 1730 | | VNF_VUNCONF | VNF_COMP | VNF_CLEARING); |
| 1731 | if (vp == NULL) |
| 1732 | panic("vndclear: null vp" ); |
| 1733 | (void) vn_close(vp, fflags, vnd->sc_cred); |
| 1734 | kauth_cred_free(vnd->sc_cred); |
| 1735 | vnd->sc_vp = NULL; |
| 1736 | vnd->sc_cred = NULL; |
| 1737 | vnd->sc_size = 0; |
| 1738 | } |
| 1739 | |
| 1740 | static int |
| 1741 | vndsize(dev_t dev) |
| 1742 | { |
| 1743 | struct vnd_softc *sc; |
| 1744 | struct disklabel *lp; |
| 1745 | int part, unit, omask; |
| 1746 | int size; |
| 1747 | |
| 1748 | unit = vndunit(dev); |
| 1749 | sc = device_lookup_private(&vnd_cd, unit); |
| 1750 | if (sc == NULL) |
| 1751 | return -1; |
| 1752 | |
| 1753 | if ((sc->sc_flags & VNF_INITED) == 0) |
| 1754 | return -1; |
| 1755 | |
| 1756 | part = DISKPART(dev); |
| 1757 | omask = sc->sc_dkdev.dk_openmask & (1 << part); |
| 1758 | lp = sc->sc_dkdev.dk_label; |
| 1759 | |
| 1760 | if (omask == 0 && vndopen(dev, 0, S_IFBLK, curlwp)) /* XXX */ |
| 1761 | return -1; |
| 1762 | |
| 1763 | if (lp->d_partitions[part].p_fstype != FS_SWAP) |
| 1764 | size = -1; |
| 1765 | else |
| 1766 | size = lp->d_partitions[part].p_size * |
| 1767 | (lp->d_secsize / DEV_BSIZE); |
| 1768 | |
| 1769 | if (omask == 0 && vndclose(dev, 0, S_IFBLK, curlwp)) /* XXX */ |
| 1770 | return -1; |
| 1771 | |
| 1772 | return size; |
| 1773 | } |
| 1774 | |
| 1775 | static int |
| 1776 | vnddump(dev_t dev, daddr_t blkno, void *va, |
| 1777 | size_t size) |
| 1778 | { |
| 1779 | |
| 1780 | /* Not implemented. */ |
| 1781 | return ENXIO; |
| 1782 | } |
| 1783 | |
| 1784 | static void |
| 1785 | vndgetdefaultlabel(struct vnd_softc *sc, struct disklabel *lp) |
| 1786 | { |
| 1787 | struct vndgeom *vng = &sc->sc_geom; |
| 1788 | struct partition *pp; |
| 1789 | unsigned spb; |
| 1790 | |
| 1791 | memset(lp, 0, sizeof(*lp)); |
| 1792 | |
| 1793 | spb = vng->vng_secsize / DEV_BSIZE; |
| 1794 | if (sc->sc_size / spb > UINT32_MAX) |
| 1795 | lp->d_secperunit = UINT32_MAX; |
| 1796 | else |
| 1797 | lp->d_secperunit = sc->sc_size / spb; |
| 1798 | lp->d_secsize = vng->vng_secsize; |
| 1799 | lp->d_nsectors = vng->vng_nsectors; |
| 1800 | lp->d_ntracks = vng->vng_ntracks; |
| 1801 | lp->d_ncylinders = vng->vng_ncylinders; |
| 1802 | lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; |
| 1803 | |
| 1804 | strncpy(lp->d_typename, "vnd" , sizeof(lp->d_typename)); |
| 1805 | lp->d_type = DKTYPE_VND; |
| 1806 | strncpy(lp->d_packname, "fictitious" , sizeof(lp->d_packname)); |
| 1807 | lp->d_rpm = 3600; |
| 1808 | lp->d_interleave = 1; |
| 1809 | lp->d_flags = 0; |
| 1810 | |
| 1811 | pp = &lp->d_partitions[RAW_PART]; |
| 1812 | pp->p_offset = 0; |
| 1813 | pp->p_size = lp->d_secperunit; |
| 1814 | pp->p_fstype = FS_UNUSED; |
| 1815 | lp->d_npartitions = RAW_PART + 1; |
| 1816 | |
| 1817 | lp->d_magic = DISKMAGIC; |
| 1818 | lp->d_magic2 = DISKMAGIC; |
| 1819 | lp->d_checksum = dkcksum(lp); |
| 1820 | } |
| 1821 | |
| 1822 | /* |
| 1823 | * Read the disklabel from a vnd. If one is not present, create a fake one. |
| 1824 | */ |
| 1825 | static void |
| 1826 | vndgetdisklabel(dev_t dev, struct vnd_softc *sc) |
| 1827 | { |
| 1828 | const char *errstring; |
| 1829 | struct disklabel *lp = sc->sc_dkdev.dk_label; |
| 1830 | struct cpu_disklabel *clp = sc->sc_dkdev.dk_cpulabel; |
| 1831 | int i; |
| 1832 | |
| 1833 | memset(clp, 0, sizeof(*clp)); |
| 1834 | |
| 1835 | vndgetdefaultlabel(sc, lp); |
| 1836 | |
| 1837 | /* |
| 1838 | * Call the generic disklabel extraction routine. |
| 1839 | */ |
| 1840 | errstring = readdisklabel(VNDLABELDEV(dev), vndstrategy, lp, clp); |
| 1841 | if (errstring) { |
| 1842 | /* |
| 1843 | * Lack of disklabel is common, but we print the warning |
| 1844 | * anyway, since it might contain other useful information. |
| 1845 | */ |
| 1846 | aprint_normal_dev(sc->sc_dev, "%s\n" , errstring); |
| 1847 | |
| 1848 | /* |
| 1849 | * For historical reasons, if there's no disklabel |
| 1850 | * present, all partitions must be FS_BSDFFS and |
| 1851 | * occupy the entire disk. |
| 1852 | */ |
| 1853 | for (i = 0; i < MAXPARTITIONS; i++) { |
| 1854 | /* |
| 1855 | * Don't wipe out port specific hack (such as |
| 1856 | * dos partition hack of i386 port). |
| 1857 | */ |
| 1858 | if (lp->d_partitions[i].p_size != 0) |
| 1859 | continue; |
| 1860 | |
| 1861 | lp->d_partitions[i].p_size = lp->d_secperunit; |
| 1862 | lp->d_partitions[i].p_offset = 0; |
| 1863 | lp->d_partitions[i].p_fstype = FS_BSDFFS; |
| 1864 | } |
| 1865 | |
| 1866 | strncpy(lp->d_packname, "default label" , |
| 1867 | sizeof(lp->d_packname)); |
| 1868 | |
| 1869 | lp->d_npartitions = MAXPARTITIONS; |
| 1870 | lp->d_checksum = dkcksum(lp); |
| 1871 | } |
| 1872 | } |
| 1873 | |
| 1874 | /* |
| 1875 | * Wait interruptibly for an exclusive lock. |
| 1876 | * |
| 1877 | * XXX |
| 1878 | * Several drivers do this; it should be abstracted and made MP-safe. |
| 1879 | */ |
| 1880 | static int |
| 1881 | vndlock(struct vnd_softc *sc) |
| 1882 | { |
| 1883 | int error; |
| 1884 | |
| 1885 | while ((sc->sc_flags & VNF_LOCKED) != 0) { |
| 1886 | sc->sc_flags |= VNF_WANTED; |
| 1887 | if ((error = tsleep(sc, PRIBIO | PCATCH, "vndlck" , 0)) != 0) |
| 1888 | return error; |
| 1889 | } |
| 1890 | sc->sc_flags |= VNF_LOCKED; |
| 1891 | return 0; |
| 1892 | } |
| 1893 | |
| 1894 | /* |
| 1895 | * Unlock and wake up any waiters. |
| 1896 | */ |
| 1897 | static void |
| 1898 | vndunlock(struct vnd_softc *sc) |
| 1899 | { |
| 1900 | |
| 1901 | sc->sc_flags &= ~VNF_LOCKED; |
| 1902 | if ((sc->sc_flags & VNF_WANTED) != 0) { |
| 1903 | sc->sc_flags &= ~VNF_WANTED; |
| 1904 | wakeup(sc); |
| 1905 | } |
| 1906 | } |
| 1907 | |
| 1908 | #ifdef VND_COMPRESSION |
| 1909 | /* compressed file read */ |
| 1910 | static void |
| 1911 | compstrategy(struct buf *bp, off_t bn) |
| 1912 | { |
| 1913 | int error; |
| 1914 | int unit = vndunit(bp->b_dev); |
| 1915 | struct vnd_softc *vnd = |
| 1916 | device_lookup_private(&vnd_cd, unit); |
| 1917 | u_int32_t comp_block; |
| 1918 | struct uio auio; |
| 1919 | char *addr; |
| 1920 | int s; |
| 1921 | |
| 1922 | /* set up constants for data move */ |
| 1923 | auio.uio_rw = UIO_READ; |
| 1924 | UIO_SETUP_SYSSPACE(&auio); |
| 1925 | |
| 1926 | /* read, and transfer the data */ |
| 1927 | addr = bp->b_data; |
| 1928 | bp->b_resid = bp->b_bcount; |
| 1929 | s = splbio(); |
| 1930 | while (bp->b_resid > 0) { |
| 1931 | unsigned length; |
| 1932 | size_t length_in_buffer; |
| 1933 | u_int32_t offset_in_buffer; |
| 1934 | struct iovec aiov; |
| 1935 | |
| 1936 | /* calculate the compressed block number */ |
| 1937 | comp_block = bn / (off_t)vnd->sc_comp_blksz; |
| 1938 | |
| 1939 | /* check for good block number */ |
| 1940 | if (comp_block >= vnd->sc_comp_numoffs) { |
| 1941 | bp->b_error = EINVAL; |
| 1942 | splx(s); |
| 1943 | return; |
| 1944 | } |
| 1945 | |
| 1946 | /* read in the compressed block, if not in buffer */ |
| 1947 | if (comp_block != vnd->sc_comp_buffblk) { |
| 1948 | length = vnd->sc_comp_offsets[comp_block + 1] - |
| 1949 | vnd->sc_comp_offsets[comp_block]; |
| 1950 | vn_lock(vnd->sc_vp, LK_EXCLUSIVE | LK_RETRY); |
| 1951 | error = vn_rdwr(UIO_READ, vnd->sc_vp, vnd->sc_comp_buff, |
| 1952 | length, vnd->sc_comp_offsets[comp_block], |
| 1953 | UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, vnd->sc_cred, |
| 1954 | NULL, NULL); |
| 1955 | if (error) { |
| 1956 | bp->b_error = error; |
| 1957 | VOP_UNLOCK(vnd->sc_vp); |
| 1958 | splx(s); |
| 1959 | return; |
| 1960 | } |
| 1961 | /* uncompress the buffer */ |
| 1962 | vnd->sc_comp_stream.next_in = vnd->sc_comp_buff; |
| 1963 | vnd->sc_comp_stream.avail_in = length; |
| 1964 | vnd->sc_comp_stream.next_out = vnd->sc_comp_decombuf; |
| 1965 | vnd->sc_comp_stream.avail_out = vnd->sc_comp_blksz; |
| 1966 | inflateReset(&vnd->sc_comp_stream); |
| 1967 | error = inflate(&vnd->sc_comp_stream, Z_FINISH); |
| 1968 | if (error != Z_STREAM_END) { |
| 1969 | if (vnd->sc_comp_stream.msg) |
| 1970 | aprint_normal_dev(vnd->sc_dev, |
| 1971 | "compressed file, %s\n" , |
| 1972 | vnd->sc_comp_stream.msg); |
| 1973 | bp->b_error = EBADMSG; |
| 1974 | VOP_UNLOCK(vnd->sc_vp); |
| 1975 | splx(s); |
| 1976 | return; |
| 1977 | } |
| 1978 | vnd->sc_comp_buffblk = comp_block; |
| 1979 | VOP_UNLOCK(vnd->sc_vp); |
| 1980 | } |
| 1981 | |
| 1982 | /* transfer the usable uncompressed data */ |
| 1983 | offset_in_buffer = bn % (off_t)vnd->sc_comp_blksz; |
| 1984 | length_in_buffer = vnd->sc_comp_blksz - offset_in_buffer; |
| 1985 | if (length_in_buffer > bp->b_resid) |
| 1986 | length_in_buffer = bp->b_resid; |
| 1987 | auio.uio_iov = &aiov; |
| 1988 | auio.uio_iovcnt = 1; |
| 1989 | aiov.iov_base = addr; |
| 1990 | aiov.iov_len = length_in_buffer; |
| 1991 | auio.uio_resid = aiov.iov_len; |
| 1992 | auio.uio_offset = 0; |
| 1993 | error = uiomove(vnd->sc_comp_decombuf + offset_in_buffer, |
| 1994 | length_in_buffer, &auio); |
| 1995 | if (error) { |
| 1996 | bp->b_error = error; |
| 1997 | splx(s); |
| 1998 | return; |
| 1999 | } |
| 2000 | |
| 2001 | bn += length_in_buffer; |
| 2002 | addr += length_in_buffer; |
| 2003 | bp->b_resid -= length_in_buffer; |
| 2004 | } |
| 2005 | splx(s); |
| 2006 | } |
| 2007 | |
| 2008 | /* compression memory allocation routines */ |
| 2009 | static void * |
| 2010 | vnd_alloc(void *aux, u_int items, u_int siz) |
| 2011 | { |
| 2012 | return malloc(items * siz, M_TEMP, M_NOWAIT); |
| 2013 | } |
| 2014 | |
| 2015 | static void |
| 2016 | vnd_free(void *aux, void *ptr) |
| 2017 | { |
| 2018 | free(ptr, M_TEMP); |
| 2019 | } |
| 2020 | #endif /* VND_COMPRESSION */ |
| 2021 | |
| 2022 | static void |
| 2023 | vnd_set_geometry(struct vnd_softc *vnd) |
| 2024 | { |
| 2025 | struct disk_geom *dg = &vnd->sc_dkdev.dk_geom; |
| 2026 | |
| 2027 | memset(dg, 0, sizeof(*dg)); |
| 2028 | |
| 2029 | dg->dg_secperunit = (int64_t)vnd->sc_geom.vng_nsectors * |
| 2030 | vnd->sc_geom.vng_ntracks * vnd->sc_geom.vng_ncylinders; |
| 2031 | dg->dg_secsize = vnd->sc_geom.vng_secsize; |
| 2032 | dg->dg_nsectors = vnd->sc_geom.vng_nsectors; |
| 2033 | dg->dg_ntracks = vnd->sc_geom.vng_ntracks; |
| 2034 | dg->dg_ncylinders = vnd->sc_geom.vng_ncylinders; |
| 2035 | |
| 2036 | #ifdef DEBUG |
| 2037 | if (vnddebug & VDB_LABEL) { |
| 2038 | printf("dg->dg_secperunit: %" PRId64 "\n" , dg->dg_secperunit); |
| 2039 | printf("dg->dg_ncylinders: %u\n" , dg->dg_ncylinders); |
| 2040 | } |
| 2041 | #endif |
| 2042 | disk_set_info(vnd->sc_dev, &vnd->sc_dkdev, NULL); |
| 2043 | } |
| 2044 | |
| 2045 | #ifdef VND_COMPRESSION |
| 2046 | #define VND_DEPENDS "zlib" |
| 2047 | #else |
| 2048 | #define VND_DEPENDS NULL |
| 2049 | #endif |
| 2050 | |
| 2051 | MODULE(MODULE_CLASS_DRIVER, vnd, VND_DEPENDS); |
| 2052 | |
| 2053 | #ifdef _MODULE |
| 2054 | int vnd_bmajor = -1, vnd_cmajor = -1; |
| 2055 | |
| 2056 | CFDRIVER_DECL(vnd, DV_DISK, NULL); |
| 2057 | #endif |
| 2058 | |
| 2059 | static int |
| 2060 | vnd_modcmd(modcmd_t cmd, void *arg) |
| 2061 | { |
| 2062 | int error = 0; |
| 2063 | |
| 2064 | switch (cmd) { |
| 2065 | case MODULE_CMD_INIT: |
| 2066 | #ifdef _MODULE |
| 2067 | error = config_cfdriver_attach(&vnd_cd); |
| 2068 | if (error) |
| 2069 | break; |
| 2070 | |
| 2071 | error = config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); |
| 2072 | if (error) { |
| 2073 | config_cfdriver_detach(&vnd_cd); |
| 2074 | aprint_error("%s: unable to register cfattach for \n" |
| 2075 | "%s, error %d" , __func__, vnd_cd.cd_name, error); |
| 2076 | break; |
| 2077 | } |
| 2078 | |
| 2079 | /* |
| 2080 | * Attach the {b,c}devsw's |
| 2081 | */ |
| 2082 | error = devsw_attach("vnd" , &vnd_bdevsw, &vnd_bmajor, |
| 2083 | &vnd_cdevsw, &vnd_cmajor); |
| 2084 | /* |
| 2085 | * If devsw_attach fails, remove from autoconf database |
| 2086 | */ |
| 2087 | if (error) { |
| 2088 | config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); |
| 2089 | config_cfdriver_detach(&vnd_cd); |
| 2090 | aprint_error("%s: unable to attach %s devsw, " |
| 2091 | "error %d" , __func__, vnd_cd.cd_name, error); |
| 2092 | break; |
| 2093 | } |
| 2094 | #endif |
| 2095 | break; |
| 2096 | |
| 2097 | case MODULE_CMD_FINI: |
| 2098 | #ifdef _MODULE |
| 2099 | /* |
| 2100 | * Remove {b,c}devsw's |
| 2101 | */ |
| 2102 | devsw_detach(&vnd_bdevsw, &vnd_cdevsw); |
| 2103 | |
| 2104 | /* |
| 2105 | * Now remove device from autoconf database |
| 2106 | */ |
| 2107 | error = config_cfattach_detach(vnd_cd.cd_name, &vnd_ca); |
| 2108 | if (error) { |
| 2109 | (void)devsw_attach("vnd" , &vnd_bdevsw, &vnd_bmajor, |
| 2110 | &vnd_cdevsw, &vnd_cmajor); |
| 2111 | aprint_error("%s: failed to detach %s cfattach, " |
| 2112 | "error %d\n" , __func__, vnd_cd.cd_name, error); |
| 2113 | break; |
| 2114 | } |
| 2115 | error = config_cfdriver_detach(&vnd_cd); |
| 2116 | if (error) { |
| 2117 | (void)config_cfattach_attach(vnd_cd.cd_name, &vnd_ca); |
| 2118 | (void)devsw_attach("vnd" , &vnd_bdevsw, &vnd_bmajor, |
| 2119 | &vnd_cdevsw, &vnd_cmajor); |
| 2120 | aprint_error("%s: failed to detach %s cfdriver, " |
| 2121 | "error %d\n" , __func__, vnd_cd.cd_name, error); |
| 2122 | break; |
| 2123 | } |
| 2124 | #endif |
| 2125 | break; |
| 2126 | |
| 2127 | case MODULE_CMD_STAT: |
| 2128 | return ENOTTY; |
| 2129 | |
| 2130 | default: |
| 2131 | return ENOTTY; |
| 2132 | } |
| 2133 | |
| 2134 | return error; |
| 2135 | } |
| 2136 | |