ccd.c revision 1.175.2.3
1 /* $NetBSD: ccd.c,v 1.175.2.3 2018/03/22 01:44:48 pgoyette Exp $ */ 2 3 /*- 4 * Copyright (c) 1996, 1997, 1998, 1999, 2007, 2009 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, and by Andrew Doran. 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 $Hdr: cd.c 1.6 90/11/28$ 66 * 67 * @(#)cd.c 8.2 (Berkeley) 11/16/93 68 */ 69 70 /* 71 * "Concatenated" disk driver. 72 * 73 * Notes on concurrency: 74 * 75 * => sc_dvlock serializes access to the device nodes, excluding block I/O. 76 * 77 * => sc_iolock serializes access to (sc_flags & CCDF_INITED), disk stats, 78 * sc_stop, sc_bufq and b_resid from master buffers. 79 * 80 * => a combination of CCDF_INITED, sc_inflight, and sc_iolock is used to 81 * serialize I/O and configuration changes. 82 * 83 * => the in-core disk label does not change while the device is open. 84 * 85 * On memory consumption: ccd fans out I/O requests and so needs to 86 * allocate memory. If the system is desperately low on memory, we 87 * single thread I/O. 88 */ 89 90 #include <sys/cdefs.h> 91 __KERNEL_RCSID(0, "$NetBSD: ccd.c,v 1.175.2.3 2018/03/22 01:44:48 pgoyette Exp $"); 92 93 #if defined(_KERNEL_OPT) 94 #include "opt_compat_netbsd.h" 95 #endif 96 97 #include <sys/param.h> 98 #include <sys/systm.h> 99 #include <sys/kernel.h> 100 #include <sys/proc.h> 101 #include <sys/errno.h> 102 #include <sys/buf.h> 103 #include <sys/kmem.h> 104 #include <sys/pool.h> 105 #include <sys/module.h> 106 #include <sys/namei.h> 107 #include <sys/stat.h> 108 #include <sys/ioctl.h> 109 #include <sys/disklabel.h> 110 #include <sys/device.h> 111 #include <sys/disk.h> 112 #include <sys/syslog.h> 113 #include <sys/fcntl.h> 114 #include <sys/vnode.h> 115 #include <sys/conf.h> 116 #include <sys/mutex.h> 117 #include <sys/queue.h> 118 #include <sys/kauth.h> 119 #include <sys/kthread.h> 120 #include <sys/bufq.h> 121 #include <sys/sysctl.h> 122 #include <sys/compat_stub.h> 123 124 #include <uvm/uvm_extern.h> 125 126 #include <dev/ccdvar.h> 127 #include <dev/dkvar.h> 128 129 #include <miscfs/specfs/specdev.h> /* for v_rdev */ 130 131 #include "ioconf.h" 132 133 #if defined(CCDDEBUG) && !defined(DEBUG) 134 #define DEBUG 135 #endif 136 137 #ifdef DEBUG 138 #define CCDB_FOLLOW 0x01 139 #define CCDB_INIT 0x02 140 #define CCDB_IO 0x04 141 #define CCDB_LABEL 0x08 142 #define CCDB_VNODE 0x10 143 int ccddebug = 0x00; 144 #endif 145 146 #define ccdunit(x) DISKUNIT(x) 147 148 struct ccdbuf { 149 struct buf cb_buf; /* new I/O buf */ 150 struct buf *cb_obp; /* ptr. to original I/O buf */ 151 struct ccd_softc *cb_sc; /* pointer to ccd softc */ 152 int cb_comp; /* target component */ 153 SIMPLEQ_ENTRY(ccdbuf) cb_q; /* fifo of component buffers */ 154 }; 155 156 /* component buffer pool */ 157 static pool_cache_t ccd_cache; 158 159 #define CCD_GETBUF() pool_cache_get(ccd_cache, PR_WAITOK) 160 #define CCD_PUTBUF(cbp) pool_cache_put(ccd_cache, cbp) 161 162 #define CCDLABELDEV(dev) \ 163 (MAKEDISKDEV(major((dev)), ccdunit((dev)), RAW_PART)) 164 165 /* called by main() at boot time */ 166 void ccddetach(void); 167 168 /* called by biodone() at interrupt time */ 169 static void ccdiodone(struct buf *); 170 171 static void ccdinterleave(struct ccd_softc *); 172 static int ccdinit(struct ccd_softc *, char **, struct vnode **, 173 struct lwp *); 174 static struct ccdbuf *ccdbuffer(struct ccd_softc *, struct buf *, 175 daddr_t, void *, long); 176 static void ccdgetdefaultlabel(struct ccd_softc *, struct disklabel *); 177 static void ccdgetdisklabel(dev_t); 178 static void ccdmakedisklabel(struct ccd_softc *); 179 static void ccdstart(struct ccd_softc *); 180 static void ccdthread(void *); 181 182 static dev_type_open(ccdopen); 183 static dev_type_close(ccdclose); 184 static dev_type_read(ccdread); 185 static dev_type_write(ccdwrite); 186 static dev_type_ioctl(ccdioctl); 187 static dev_type_strategy(ccdstrategy); 188 static dev_type_size(ccdsize); 189 190 const struct bdevsw ccd_bdevsw = { 191 .d_open = ccdopen, 192 .d_close = ccdclose, 193 .d_strategy = ccdstrategy, 194 .d_ioctl = ccdioctl, 195 .d_dump = nodump, 196 .d_psize = ccdsize, 197 .d_discard = nodiscard, 198 .d_flag = D_DISK | D_MPSAFE 199 }; 200 201 const struct cdevsw ccd_cdevsw = { 202 .d_open = ccdopen, 203 .d_close = ccdclose, 204 .d_read = ccdread, 205 .d_write = ccdwrite, 206 .d_ioctl = ccdioctl, 207 .d_stop = nostop, 208 .d_tty = notty, 209 .d_poll = nopoll, 210 .d_mmap = nommap, 211 .d_kqfilter = nokqfilter, 212 .d_discard = nodiscard, 213 .d_flag = D_DISK | D_MPSAFE 214 }; 215 216 #ifdef DEBUG 217 static void printiinfo(struct ccdiinfo *); 218 #endif 219 220 static LIST_HEAD(, ccd_softc) ccds = LIST_HEAD_INITIALIZER(ccds); 221 static kmutex_t ccd_lock; 222 223 #ifdef _MODULE 224 static struct sysctllog *ccd_clog; 225 #endif 226 227 SYSCTL_SETUP_PROTO(sysctl_kern_ccd_setup); 228 229 static struct ccd_softc * 230 ccdcreate(int unit) { 231 struct ccd_softc *sc = kmem_zalloc(sizeof(*sc), KM_SLEEP); 232 233 /* Initialize per-softc structures. */ 234 snprintf(sc->sc_xname, sizeof(sc->sc_xname), "ccd%d", unit); 235 sc->sc_unit = unit; 236 mutex_init(&sc->sc_dvlock, MUTEX_DEFAULT, IPL_NONE); 237 sc->sc_iolock = mutex_obj_alloc(MUTEX_DEFAULT, IPL_NONE); 238 cv_init(&sc->sc_stop, "ccdstop"); 239 cv_init(&sc->sc_push, "ccdthr"); 240 disk_init(&sc->sc_dkdev, sc->sc_xname, NULL); /* XXX */ 241 return sc; 242 } 243 244 static void 245 ccddestroy(struct ccd_softc *sc) { 246 mutex_obj_free(sc->sc_iolock); 247 mutex_exit(&sc->sc_dvlock); 248 mutex_destroy(&sc->sc_dvlock); 249 cv_destroy(&sc->sc_stop); 250 cv_destroy(&sc->sc_push); 251 disk_destroy(&sc->sc_dkdev); 252 kmem_free(sc, sizeof(*sc)); 253 } 254 255 static struct ccd_softc * 256 ccdget(int unit, int make) { 257 struct ccd_softc *sc; 258 if (unit < 0) { 259 #ifdef DIAGNOSTIC 260 panic("%s: unit %d!", __func__, unit); 261 #endif 262 return NULL; 263 } 264 mutex_enter(&ccd_lock); 265 LIST_FOREACH(sc, &ccds, sc_link) { 266 if (sc->sc_unit == unit) { 267 mutex_exit(&ccd_lock); 268 return sc; 269 } 270 } 271 mutex_exit(&ccd_lock); 272 if (!make) 273 return NULL; 274 if ((sc = ccdcreate(unit)) == NULL) 275 return NULL; 276 mutex_enter(&ccd_lock); 277 LIST_INSERT_HEAD(&ccds, sc, sc_link); 278 mutex_exit(&ccd_lock); 279 return sc; 280 } 281 282 static void 283 ccdput(struct ccd_softc *sc) { 284 mutex_enter(&ccd_lock); 285 LIST_REMOVE(sc, sc_link); 286 mutex_exit(&ccd_lock); 287 ccddestroy(sc); 288 } 289 290 /* 291 * Called by main() during pseudo-device attachment. All we need 292 * to do is allocate enough space for devices to be configured later. 293 */ 294 void 295 ccdattach(int num) 296 { 297 mutex_init(&ccd_lock, MUTEX_DEFAULT, IPL_NONE); 298 299 /* Initialize the component buffer pool. */ 300 ccd_cache = pool_cache_init(sizeof(struct ccdbuf), 0, 301 0, 0, "ccdbuf", NULL, IPL_BIO, NULL, NULL, NULL); 302 } 303 304 void 305 ccddetach(void) 306 { 307 pool_cache_destroy(ccd_cache); 308 mutex_destroy(&ccd_lock); 309 } 310 311 static int 312 ccdinit(struct ccd_softc *cs, char **cpaths, struct vnode **vpp, 313 struct lwp *l) 314 { 315 struct ccdcinfo *ci = NULL; 316 int ix; 317 struct ccdgeom *ccg = &cs->sc_geom; 318 char *tmppath; 319 int error, path_alloced; 320 uint64_t psize, minsize; 321 unsigned secsize, maxsecsize; 322 struct disk_geom *dg; 323 324 #ifdef DEBUG 325 if (ccddebug & (CCDB_FOLLOW|CCDB_INIT)) 326 printf("%s: ccdinit\n", cs->sc_xname); 327 #endif 328 329 /* Allocate space for the component info. */ 330 cs->sc_cinfo = kmem_alloc(cs->sc_nccdisks * sizeof(*cs->sc_cinfo), 331 KM_SLEEP); 332 tmppath = kmem_alloc(MAXPATHLEN, KM_SLEEP); 333 334 cs->sc_size = 0; 335 336 /* 337 * Verify that each component piece exists and record 338 * relevant information about it. 339 */ 340 maxsecsize = 0; 341 minsize = 0; 342 for (ix = 0, path_alloced = 0; ix < cs->sc_nccdisks; ix++) { 343 ci = &cs->sc_cinfo[ix]; 344 ci->ci_vp = vpp[ix]; 345 346 /* 347 * Copy in the pathname of the component. 348 */ 349 memset(tmppath, 0, MAXPATHLEN); /* sanity */ 350 error = copyinstr(cpaths[ix], tmppath, 351 MAXPATHLEN, &ci->ci_pathlen); 352 if (ci->ci_pathlen == 0) 353 error = EINVAL; 354 if (error) { 355 #ifdef DEBUG 356 if (ccddebug & (CCDB_FOLLOW|CCDB_INIT)) 357 printf("%s: can't copy path, error = %d\n", 358 cs->sc_xname, error); 359 #endif 360 goto out; 361 } 362 ci->ci_path = kmem_alloc(ci->ci_pathlen, KM_SLEEP); 363 memcpy(ci->ci_path, tmppath, ci->ci_pathlen); 364 path_alloced++; 365 366 /* 367 * XXX: Cache the component's dev_t. 368 */ 369 ci->ci_dev = vpp[ix]->v_rdev; 370 371 /* 372 * Get partition information for the component. 373 */ 374 error = getdisksize(vpp[ix], &psize, &secsize); 375 if (error) { 376 #ifdef DEBUG 377 if (ccddebug & (CCDB_FOLLOW|CCDB_INIT)) 378 printf("%s: %s: disksize failed, error = %d\n", 379 cs->sc_xname, ci->ci_path, error); 380 #endif 381 goto out; 382 } 383 384 /* 385 * Calculate the size, truncating to an interleave 386 * boundary if necessary. 387 */ 388 maxsecsize = secsize > maxsecsize ? secsize : maxsecsize; 389 if (cs->sc_ileave > 1) 390 psize -= psize % cs->sc_ileave; 391 392 if (psize == 0) { 393 #ifdef DEBUG 394 if (ccddebug & (CCDB_FOLLOW|CCDB_INIT)) 395 printf("%s: %s: size == 0\n", 396 cs->sc_xname, ci->ci_path); 397 #endif 398 error = ENODEV; 399 goto out; 400 } 401 402 if (minsize == 0 || psize < minsize) 403 minsize = psize; 404 ci->ci_size = psize; 405 cs->sc_size += psize; 406 } 407 408 /* 409 * Don't allow the interleave to be smaller than 410 * the biggest component sector. 411 */ 412 if ((cs->sc_ileave > 0) && 413 (cs->sc_ileave < (maxsecsize / DEV_BSIZE))) { 414 #ifdef DEBUG 415 if (ccddebug & (CCDB_FOLLOW|CCDB_INIT)) 416 printf("%s: interleave must be at least %d\n", 417 cs->sc_xname, (maxsecsize / DEV_BSIZE)); 418 #endif 419 error = EINVAL; 420 goto out; 421 } 422 423 /* 424 * If uniform interleave is desired set all sizes to that of 425 * the smallest component. 426 */ 427 if (cs->sc_flags & CCDF_UNIFORM) { 428 for (ci = cs->sc_cinfo; 429 ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) 430 ci->ci_size = minsize; 431 432 cs->sc_size = cs->sc_nccdisks * minsize; 433 } 434 435 /* 436 * Construct the interleave table. 437 */ 438 ccdinterleave(cs); 439 440 /* 441 * Create pseudo-geometry based on 1MB cylinders. It's 442 * pretty close. 443 */ 444 ccg->ccg_secsize = DEV_BSIZE; 445 ccg->ccg_ntracks = 1; 446 ccg->ccg_nsectors = 1024 * (1024 / ccg->ccg_secsize); 447 ccg->ccg_ncylinders = cs->sc_size / ccg->ccg_nsectors; 448 449 dg = &cs->sc_dkdev.dk_geom; 450 memset(dg, 0, sizeof(*dg)); 451 dg->dg_secperunit = cs->sc_size; 452 dg->dg_secsize = ccg->ccg_secsize; 453 dg->dg_nsectors = ccg->ccg_nsectors; 454 dg->dg_ntracks = ccg->ccg_ntracks; 455 dg->dg_ncylinders = ccg->ccg_ncylinders; 456 457 if (cs->sc_ileave > 0) 458 aprint_normal("%s: Interleaving %d component%s " 459 "(%d block interleave)\n", cs->sc_xname, 460 cs->sc_nccdisks, (cs->sc_nccdisks != 0 ? "s" : ""), 461 cs->sc_ileave); 462 else 463 aprint_normal("%s: Concatenating %d component%s\n", 464 cs->sc_xname, 465 cs->sc_nccdisks, (cs->sc_nccdisks != 0 ? "s" : "")); 466 for (ix = 0; ix < cs->sc_nccdisks; ix++) { 467 ci = &cs->sc_cinfo[ix]; 468 aprint_normal("%s: %s (%ju blocks)\n", cs->sc_xname, 469 ci->ci_path, (uintmax_t)ci->ci_size); 470 } 471 aprint_normal("%s: total %ju blocks\n", cs->sc_xname, cs->sc_size); 472 473 /* 474 * Create thread to handle deferred I/O. 475 */ 476 cs->sc_zap = false; 477 error = kthread_create(PRI_BIO, KTHREAD_MPSAFE, NULL, ccdthread, 478 cs, &cs->sc_thread, "%s", cs->sc_xname); 479 if (error) { 480 printf("ccdinit: can't create thread: %d\n", error); 481 goto out; 482 } 483 484 /* 485 * Only now that everything is set up can we enable the device. 486 */ 487 mutex_enter(cs->sc_iolock); 488 cs->sc_flags |= CCDF_INITED; 489 mutex_exit(cs->sc_iolock); 490 kmem_free(tmppath, MAXPATHLEN); 491 return (0); 492 493 out: 494 for (ix = 0; ix < path_alloced; ix++) { 495 kmem_free(cs->sc_cinfo[ix].ci_path, 496 cs->sc_cinfo[ix].ci_pathlen); 497 } 498 kmem_free(cs->sc_cinfo, cs->sc_nccdisks * sizeof(struct ccdcinfo)); 499 kmem_free(tmppath, MAXPATHLEN); 500 return (error); 501 } 502 503 static void 504 ccdinterleave(struct ccd_softc *cs) 505 { 506 struct ccdcinfo *ci, *smallci; 507 struct ccdiinfo *ii; 508 daddr_t bn, lbn; 509 int ix; 510 u_long size; 511 512 #ifdef DEBUG 513 if (ccddebug & CCDB_INIT) 514 printf("ccdinterleave(%p): ileave %d\n", cs, cs->sc_ileave); 515 #endif 516 /* 517 * Allocate an interleave table. 518 * Chances are this is too big, but we don't care. 519 */ 520 size = (cs->sc_nccdisks + 1) * sizeof(struct ccdiinfo); 521 cs->sc_itable = kmem_zalloc(size, KM_SLEEP); 522 523 /* 524 * Trivial case: no interleave (actually interleave of disk size). 525 * Each table entry represents a single component in its entirety. 526 */ 527 if (cs->sc_ileave == 0) { 528 bn = 0; 529 ii = cs->sc_itable; 530 531 for (ix = 0; ix < cs->sc_nccdisks; ix++) { 532 /* Allocate space for ii_index. */ 533 ii->ii_indexsz = sizeof(int); 534 ii->ii_index = kmem_alloc(ii->ii_indexsz, KM_SLEEP); 535 ii->ii_ndisk = 1; 536 ii->ii_startblk = bn; 537 ii->ii_startoff = 0; 538 ii->ii_index[0] = ix; 539 bn += cs->sc_cinfo[ix].ci_size; 540 ii++; 541 } 542 ii->ii_ndisk = 0; 543 #ifdef DEBUG 544 if (ccddebug & CCDB_INIT) 545 printiinfo(cs->sc_itable); 546 #endif 547 return; 548 } 549 550 /* 551 * The following isn't fast or pretty; it doesn't have to be. 552 */ 553 size = 0; 554 bn = lbn = 0; 555 for (ii = cs->sc_itable; ; ii++) { 556 /* Allocate space for ii_index. */ 557 ii->ii_indexsz = sizeof(int) * cs->sc_nccdisks; 558 ii->ii_index = kmem_alloc(ii->ii_indexsz, KM_SLEEP); 559 560 /* 561 * Locate the smallest of the remaining components 562 */ 563 smallci = NULL; 564 for (ci = cs->sc_cinfo; 565 ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) 566 if (ci->ci_size > size && 567 (smallci == NULL || 568 ci->ci_size < smallci->ci_size)) 569 smallci = ci; 570 571 /* 572 * Nobody left, all done 573 */ 574 if (smallci == NULL) { 575 ii->ii_ndisk = 0; 576 break; 577 } 578 579 /* 580 * Record starting logical block and component offset 581 */ 582 ii->ii_startblk = bn / cs->sc_ileave; 583 ii->ii_startoff = lbn; 584 585 /* 586 * Determine how many disks take part in this interleave 587 * and record their indices. 588 */ 589 ix = 0; 590 for (ci = cs->sc_cinfo; 591 ci < &cs->sc_cinfo[cs->sc_nccdisks]; ci++) 592 if (ci->ci_size >= smallci->ci_size) 593 ii->ii_index[ix++] = ci - cs->sc_cinfo; 594 ii->ii_ndisk = ix; 595 bn += ix * (smallci->ci_size - size); 596 lbn = smallci->ci_size / cs->sc_ileave; 597 size = smallci->ci_size; 598 } 599 #ifdef DEBUG 600 if (ccddebug & CCDB_INIT) 601 printiinfo(cs->sc_itable); 602 #endif 603 } 604 605 /* ARGSUSED */ 606 static int 607 ccdopen(dev_t dev, int flags, int fmt, struct lwp *l) 608 { 609 int unit = ccdunit(dev); 610 struct ccd_softc *cs; 611 struct disklabel *lp; 612 int error = 0, part, pmask; 613 614 #ifdef DEBUG 615 if (ccddebug & CCDB_FOLLOW) 616 printf("ccdopen(0x%"PRIx64", 0x%x)\n", dev, flags); 617 #endif 618 if ((cs = ccdget(unit, 1)) == NULL) 619 return ENXIO; 620 621 mutex_enter(&cs->sc_dvlock); 622 623 lp = cs->sc_dkdev.dk_label; 624 625 part = DISKPART(dev); 626 pmask = (1 << part); 627 628 /* 629 * If we're initialized, check to see if there are any other 630 * open partitions. If not, then it's safe to update 631 * the in-core disklabel. Only read the disklabel if it is 632 * not already valid. 633 */ 634 if ((cs->sc_flags & (CCDF_INITED|CCDF_VLABEL)) == CCDF_INITED && 635 cs->sc_dkdev.dk_openmask == 0) 636 ccdgetdisklabel(dev); 637 638 /* Check that the partition exists. */ 639 if (part != RAW_PART) { 640 if (((cs->sc_flags & CCDF_INITED) == 0) || 641 ((part >= lp->d_npartitions) || 642 (lp->d_partitions[part].p_fstype == FS_UNUSED))) { 643 error = ENXIO; 644 goto done; 645 } 646 } 647 648 /* Prevent our unit from being unconfigured while open. */ 649 switch (fmt) { 650 case S_IFCHR: 651 cs->sc_dkdev.dk_copenmask |= pmask; 652 break; 653 654 case S_IFBLK: 655 cs->sc_dkdev.dk_bopenmask |= pmask; 656 break; 657 } 658 cs->sc_dkdev.dk_openmask = 659 cs->sc_dkdev.dk_copenmask | cs->sc_dkdev.dk_bopenmask; 660 661 done: 662 mutex_exit(&cs->sc_dvlock); 663 return (error); 664 } 665 666 /* ARGSUSED */ 667 static int 668 ccdclose(dev_t dev, int flags, int fmt, struct lwp *l) 669 { 670 int unit = ccdunit(dev); 671 struct ccd_softc *cs; 672 int part; 673 674 #ifdef DEBUG 675 if (ccddebug & CCDB_FOLLOW) 676 printf("ccdclose(0x%"PRIx64", 0x%x)\n", dev, flags); 677 #endif 678 679 if ((cs = ccdget(unit, 0)) == NULL) 680 return ENXIO; 681 682 mutex_enter(&cs->sc_dvlock); 683 684 part = DISKPART(dev); 685 686 /* ...that much closer to allowing unconfiguration... */ 687 switch (fmt) { 688 case S_IFCHR: 689 cs->sc_dkdev.dk_copenmask &= ~(1 << part); 690 break; 691 692 case S_IFBLK: 693 cs->sc_dkdev.dk_bopenmask &= ~(1 << part); 694 break; 695 } 696 cs->sc_dkdev.dk_openmask = 697 cs->sc_dkdev.dk_copenmask | cs->sc_dkdev.dk_bopenmask; 698 699 if (cs->sc_dkdev.dk_openmask == 0) { 700 if ((cs->sc_flags & CCDF_KLABEL) == 0) 701 cs->sc_flags &= ~CCDF_VLABEL; 702 } 703 704 mutex_exit(&cs->sc_dvlock); 705 return (0); 706 } 707 708 static bool 709 ccdbackoff(struct ccd_softc *cs) 710 { 711 712 /* XXX Arbitrary, should be a uvm call. */ 713 return uvmexp.free < (uvmexp.freemin >> 1) && 714 disk_isbusy(&cs->sc_dkdev); 715 } 716 717 static void 718 ccdthread(void *cookie) 719 { 720 struct ccd_softc *cs; 721 722 cs = cookie; 723 724 #ifdef DEBUG 725 if (ccddebug & CCDB_FOLLOW) 726 printf("ccdthread: hello\n"); 727 #endif 728 729 mutex_enter(cs->sc_iolock); 730 while (__predict_true(!cs->sc_zap)) { 731 if (bufq_peek(cs->sc_bufq) == NULL) { 732 /* Nothing to do. */ 733 cv_wait(&cs->sc_push, cs->sc_iolock); 734 continue; 735 } 736 if (ccdbackoff(cs)) { 737 /* Wait for memory to become available. */ 738 (void)cv_timedwait(&cs->sc_push, cs->sc_iolock, 1); 739 continue; 740 } 741 #ifdef DEBUG 742 if (ccddebug & CCDB_FOLLOW) 743 printf("ccdthread: dispatching I/O\n"); 744 #endif 745 ccdstart(cs); 746 mutex_enter(cs->sc_iolock); 747 } 748 cs->sc_thread = NULL; 749 mutex_exit(cs->sc_iolock); 750 #ifdef DEBUG 751 if (ccddebug & CCDB_FOLLOW) 752 printf("ccdthread: goodbye\n"); 753 #endif 754 kthread_exit(0); 755 } 756 757 static void 758 ccdstrategy(struct buf *bp) 759 { 760 int unit = ccdunit(bp->b_dev); 761 struct ccd_softc *cs; 762 if ((cs = ccdget(unit, 0)) == NULL) 763 return; 764 765 /* Must be open or reading label. */ 766 KASSERT(cs->sc_dkdev.dk_openmask != 0 || 767 (cs->sc_flags & CCDF_RLABEL) != 0); 768 769 mutex_enter(cs->sc_iolock); 770 /* Synchronize with device init/uninit. */ 771 if (__predict_false((cs->sc_flags & CCDF_INITED) == 0)) { 772 mutex_exit(cs->sc_iolock); 773 #ifdef DEBUG 774 if (ccddebug & CCDB_FOLLOW) 775 printf("ccdstrategy: unit %d: not inited\n", unit); 776 #endif 777 bp->b_error = ENXIO; 778 bp->b_resid = bp->b_bcount; 779 biodone(bp); 780 return; 781 } 782 783 /* Defer to thread if system is low on memory. */ 784 bufq_put(cs->sc_bufq, bp); 785 if (__predict_false(ccdbackoff(cs))) { 786 mutex_exit(cs->sc_iolock); 787 #ifdef DEBUG 788 if (ccddebug & CCDB_FOLLOW) 789 printf("ccdstrategy: holding off on I/O\n"); 790 #endif 791 return; 792 } 793 ccdstart(cs); 794 } 795 796 static void 797 ccdstart(struct ccd_softc *cs) 798 { 799 daddr_t blkno; 800 int wlabel; 801 struct disklabel *lp; 802 long bcount, rcount; 803 struct ccdbuf *cbp; 804 char *addr; 805 daddr_t bn; 806 vnode_t *vp; 807 buf_t *bp; 808 809 KASSERT(mutex_owned(cs->sc_iolock)); 810 811 bp = bufq_get(cs->sc_bufq); 812 KASSERT(bp != NULL); 813 814 disk_busy(&cs->sc_dkdev); 815 816 #ifdef DEBUG 817 if (ccddebug & CCDB_FOLLOW) 818 printf("ccdstart(%s, %p)\n", cs->sc_xname, bp); 819 #endif 820 821 /* If it's a nil transfer, wake up the top half now. */ 822 if (bp->b_bcount == 0) 823 goto done; 824 825 lp = cs->sc_dkdev.dk_label; 826 827 /* 828 * Do bounds checking and adjust transfer. If there's an 829 * error, the bounds check will flag that for us. Convert 830 * the partition relative block number to an absolute. 831 */ 832 blkno = bp->b_blkno; 833 wlabel = cs->sc_flags & (CCDF_WLABEL|CCDF_LABELLING); 834 if (DISKPART(bp->b_dev) != RAW_PART) { 835 if (bounds_check_with_label(&cs->sc_dkdev, bp, wlabel) <= 0) 836 goto done; 837 blkno += lp->d_partitions[DISKPART(bp->b_dev)].p_offset; 838 } 839 mutex_exit(cs->sc_iolock); 840 bp->b_rawblkno = blkno; 841 842 /* Allocate the component buffers and start I/O! */ 843 bp->b_resid = bp->b_bcount; 844 bn = bp->b_rawblkno; 845 addr = bp->b_data; 846 for (bcount = bp->b_bcount; bcount > 0; bcount -= rcount) { 847 cbp = ccdbuffer(cs, bp, bn, addr, bcount); 848 rcount = cbp->cb_buf.b_bcount; 849 bn += btodb(rcount); 850 addr += rcount; 851 vp = cbp->cb_buf.b_vp; 852 if ((cbp->cb_buf.b_flags & B_READ) == 0) { 853 mutex_enter(vp->v_interlock); 854 vp->v_numoutput++; 855 mutex_exit(vp->v_interlock); 856 } 857 (void)VOP_STRATEGY(vp, &cbp->cb_buf); 858 } 859 return; 860 861 done: 862 disk_unbusy(&cs->sc_dkdev, 0, 0); 863 cv_broadcast(&cs->sc_stop); 864 cv_broadcast(&cs->sc_push); 865 mutex_exit(cs->sc_iolock); 866 bp->b_resid = bp->b_bcount; 867 biodone(bp); 868 } 869 870 /* 871 * Build a component buffer header. 872 */ 873 static struct ccdbuf * 874 ccdbuffer(struct ccd_softc *cs, struct buf *bp, daddr_t bn, void *addr, 875 long bcount) 876 { 877 struct ccdcinfo *ci; 878 struct ccdbuf *cbp; 879 daddr_t cbn, cboff; 880 u_int64_t cbc; 881 int ccdisk; 882 883 #ifdef DEBUG 884 if (ccddebug & CCDB_IO) 885 printf("ccdbuffer(%p, %p, %" PRId64 ", %p, %ld)\n", 886 cs, bp, bn, addr, bcount); 887 #endif 888 /* 889 * Determine which component bn falls in. 890 */ 891 cbn = bn; 892 cboff = 0; 893 894 /* 895 * Serially concatenated 896 */ 897 if (cs->sc_ileave == 0) { 898 daddr_t sblk; 899 900 sblk = 0; 901 for (ccdisk = 0, ci = &cs->sc_cinfo[ccdisk]; 902 cbn >= sblk + ci->ci_size; 903 ccdisk++, ci = &cs->sc_cinfo[ccdisk]) 904 sblk += ci->ci_size; 905 cbn -= sblk; 906 } 907 /* 908 * Interleaved 909 */ 910 else { 911 struct ccdiinfo *ii; 912 int off; 913 914 cboff = cbn % cs->sc_ileave; 915 cbn /= cs->sc_ileave; 916 for (ii = cs->sc_itable; ii->ii_ndisk; ii++) 917 if (ii->ii_startblk > cbn) 918 break; 919 ii--; 920 off = cbn - ii->ii_startblk; 921 if (ii->ii_ndisk == 1) { 922 ccdisk = ii->ii_index[0]; 923 cbn = ii->ii_startoff + off; 924 } else { 925 ccdisk = ii->ii_index[off % ii->ii_ndisk]; 926 cbn = ii->ii_startoff + off / ii->ii_ndisk; 927 } 928 cbn *= cs->sc_ileave; 929 ci = &cs->sc_cinfo[ccdisk]; 930 } 931 932 /* 933 * Fill in the component buf structure. 934 */ 935 cbp = CCD_GETBUF(); 936 KASSERT(cbp != NULL); 937 buf_init(&cbp->cb_buf); 938 cbp->cb_buf.b_flags = bp->b_flags; 939 cbp->cb_buf.b_oflags = bp->b_oflags; 940 cbp->cb_buf.b_cflags = bp->b_cflags; 941 cbp->cb_buf.b_iodone = ccdiodone; 942 cbp->cb_buf.b_proc = bp->b_proc; 943 cbp->cb_buf.b_dev = ci->ci_dev; 944 cbp->cb_buf.b_blkno = cbn + cboff; 945 cbp->cb_buf.b_data = addr; 946 cbp->cb_buf.b_vp = ci->ci_vp; 947 cbp->cb_buf.b_objlock = ci->ci_vp->v_interlock; 948 if (cs->sc_ileave == 0) 949 cbc = dbtob((u_int64_t)(ci->ci_size - cbn)); 950 else 951 cbc = dbtob((u_int64_t)(cs->sc_ileave - cboff)); 952 cbp->cb_buf.b_bcount = cbc < bcount ? cbc : bcount; 953 954 /* 955 * context for ccdiodone 956 */ 957 cbp->cb_obp = bp; 958 cbp->cb_sc = cs; 959 cbp->cb_comp = ccdisk; 960 961 BIO_COPYPRIO(&cbp->cb_buf, bp); 962 963 #ifdef DEBUG 964 if (ccddebug & CCDB_IO) 965 printf(" dev 0x%"PRIx64"(u%lu): cbp %p bn %" PRId64 " addr %p" 966 " bcnt %d\n", 967 ci->ci_dev, (unsigned long) (ci-cs->sc_cinfo), cbp, 968 cbp->cb_buf.b_blkno, cbp->cb_buf.b_data, 969 cbp->cb_buf.b_bcount); 970 #endif 971 972 return (cbp); 973 } 974 975 /* 976 * Called at interrupt time. 977 * Mark the component as done and if all components are done, 978 * take a ccd interrupt. 979 */ 980 static void 981 ccdiodone(struct buf *vbp) 982 { 983 struct ccdbuf *cbp = (struct ccdbuf *) vbp; 984 struct buf *bp = cbp->cb_obp; 985 struct ccd_softc *cs = cbp->cb_sc; 986 int count; 987 988 #ifdef DEBUG 989 if (ccddebug & CCDB_FOLLOW) 990 printf("ccdiodone(%p)\n", cbp); 991 if (ccddebug & CCDB_IO) { 992 printf("ccdiodone: bp %p bcount %d resid %d\n", 993 bp, bp->b_bcount, bp->b_resid); 994 printf(" dev 0x%"PRIx64"(u%d), cbp %p bn %" PRId64 " addr %p" 995 " bcnt %d\n", 996 cbp->cb_buf.b_dev, cbp->cb_comp, cbp, 997 cbp->cb_buf.b_blkno, cbp->cb_buf.b_data, 998 cbp->cb_buf.b_bcount); 999 } 1000 #endif 1001 1002 if (cbp->cb_buf.b_error != 0) { 1003 bp->b_error = cbp->cb_buf.b_error; 1004 printf("%s: error %d on component %d\n", 1005 cs->sc_xname, bp->b_error, cbp->cb_comp); 1006 } 1007 count = cbp->cb_buf.b_bcount; 1008 buf_destroy(&cbp->cb_buf); 1009 CCD_PUTBUF(cbp); 1010 1011 /* 1012 * If all done, "interrupt". 1013 */ 1014 mutex_enter(cs->sc_iolock); 1015 bp->b_resid -= count; 1016 if (bp->b_resid < 0) 1017 panic("ccdiodone: count"); 1018 if (bp->b_resid == 0) { 1019 /* 1020 * Request is done for better or worse, wakeup the top half. 1021 */ 1022 if (bp->b_error != 0) 1023 bp->b_resid = bp->b_bcount; 1024 disk_unbusy(&cs->sc_dkdev, (bp->b_bcount - bp->b_resid), 1025 (bp->b_flags & B_READ)); 1026 if (!disk_isbusy(&cs->sc_dkdev)) { 1027 if (bufq_peek(cs->sc_bufq) != NULL) { 1028 cv_broadcast(&cs->sc_push); 1029 } 1030 cv_broadcast(&cs->sc_stop); 1031 } 1032 mutex_exit(cs->sc_iolock); 1033 biodone(bp); 1034 } else 1035 mutex_exit(cs->sc_iolock); 1036 } 1037 1038 /* ARGSUSED */ 1039 static int 1040 ccdread(dev_t dev, struct uio *uio, int flags) 1041 { 1042 int unit = ccdunit(dev); 1043 struct ccd_softc *cs; 1044 1045 #ifdef DEBUG 1046 if (ccddebug & CCDB_FOLLOW) 1047 printf("ccdread(0x%"PRIx64", %p)\n", dev, uio); 1048 #endif 1049 if ((cs = ccdget(unit, 0)) == NULL) 1050 return 0; 1051 1052 /* Unlocked advisory check, ccdstrategy check is synchronous. */ 1053 if ((cs->sc_flags & CCDF_INITED) == 0) 1054 return (ENXIO); 1055 1056 return (physio(ccdstrategy, NULL, dev, B_READ, minphys, uio)); 1057 } 1058 1059 /* ARGSUSED */ 1060 static int 1061 ccdwrite(dev_t dev, struct uio *uio, int flags) 1062 { 1063 int unit = ccdunit(dev); 1064 struct ccd_softc *cs; 1065 1066 #ifdef DEBUG 1067 if (ccddebug & CCDB_FOLLOW) 1068 printf("ccdwrite(0x%"PRIx64", %p)\n", dev, uio); 1069 #endif 1070 if ((cs = ccdget(unit, 0)) == NULL) 1071 return ENOENT; 1072 1073 /* Unlocked advisory check, ccdstrategy check is synchronous. */ 1074 if ((cs->sc_flags & CCDF_INITED) == 0) 1075 return (ENXIO); 1076 1077 return (physio(ccdstrategy, NULL, dev, B_WRITE, minphys, uio)); 1078 } 1079 1080 int (*compat_ccd_ioctl_60)(dev_t, u_long, void *, int, struct lwp *, 1081 int (*)(dev_t, u_long, void *, int, struct lwp *)) = (void *)enosys; 1082 1083 static int 1084 ccdioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l) 1085 { 1086 int unit = ccdunit(dev); 1087 int i, j, lookedup = 0, error = 0; 1088 int part, pmask, make; 1089 struct ccd_softc *cs; 1090 struct ccd_ioctl *ccio = (struct ccd_ioctl *)data; 1091 kauth_cred_t uc; 1092 char **cpp; 1093 struct pathbuf *pb; 1094 struct vnode **vpp; 1095 #ifdef __HAVE_OLD_DISKLABEL 1096 struct disklabel newlabel; 1097 #endif 1098 1099 switch (cmd) { 1100 case CCDIOCSET: 1101 make = 1; 1102 break; 1103 default: 1104 if ((*compat_ccd_ioctl_60)(0, cmd, NULL, 0, NULL, NULL) == 0) 1105 make = 1; 1106 else 1107 make = 0; 1108 break; 1109 } 1110 1111 if ((cs = ccdget(unit, make)) == NULL) 1112 return ENOENT; 1113 uc = kauth_cred_get(); 1114 1115 error = (*compat_ccd_ioctl_60)(dev, cmd, data, flag, l, ccdioctl); 1116 if (error != ENOSYS) 1117 return error; 1118 1119 /* Must be open for writes for these commands... */ 1120 switch (cmd) { 1121 case CCDIOCSET: 1122 case CCDIOCCLR: 1123 case DIOCSDINFO: 1124 case DIOCWDINFO: 1125 case DIOCCACHESYNC: 1126 case DIOCAWEDGE: 1127 case DIOCDWEDGE: 1128 case DIOCMWEDGES: 1129 #ifdef __HAVE_OLD_DISKLABEL 1130 case ODIOCSDINFO: 1131 case ODIOCWDINFO: 1132 #endif 1133 case DIOCKLABEL: 1134 case DIOCWLABEL: 1135 if ((flag & FWRITE) == 0) 1136 return (EBADF); 1137 } 1138 1139 mutex_enter(&cs->sc_dvlock); 1140 1141 /* Must be initialized for these... */ 1142 switch (cmd) { 1143 case CCDIOCCLR: 1144 case DIOCGDINFO: 1145 case DIOCGSTRATEGY: 1146 case DIOCGCACHE: 1147 case DIOCCACHESYNC: 1148 case DIOCAWEDGE: 1149 case DIOCDWEDGE: 1150 case DIOCLWEDGES: 1151 case DIOCMWEDGES: 1152 case DIOCSDINFO: 1153 case DIOCWDINFO: 1154 case DIOCGPARTINFO: 1155 case DIOCWLABEL: 1156 case DIOCKLABEL: 1157 case DIOCGDEFLABEL: 1158 #ifdef __HAVE_OLD_DISKLABEL 1159 case ODIOCGDINFO: 1160 case ODIOCSDINFO: 1161 case ODIOCWDINFO: 1162 case ODIOCGDEFLABEL: 1163 #endif 1164 if ((cs->sc_flags & CCDF_INITED) == 0) { 1165 error = ENXIO; 1166 goto out; 1167 } 1168 } 1169 1170 error = disk_ioctl(&cs->sc_dkdev, dev, cmd, data, flag, l); 1171 if (error != EPASSTHROUGH) 1172 goto out; 1173 1174 error = 0; 1175 switch (cmd) { 1176 case CCDIOCSET: 1177 if (cs->sc_flags & CCDF_INITED) { 1178 error = EBUSY; 1179 goto out; 1180 } 1181 1182 /* Validate the flags. */ 1183 if ((ccio->ccio_flags & CCDF_USERMASK) != ccio->ccio_flags) { 1184 error = EINVAL; 1185 goto out; 1186 } 1187 1188 if (ccio->ccio_ndisks > CCD_MAXNDISKS || 1189 ccio->ccio_ndisks == 0) { 1190 error = EINVAL; 1191 goto out; 1192 } 1193 1194 /* Fill in some important bits. */ 1195 cs->sc_ileave = ccio->ccio_ileave; 1196 cs->sc_nccdisks = ccio->ccio_ndisks; 1197 cs->sc_flags = ccio->ccio_flags & CCDF_USERMASK; 1198 1199 /* 1200 * Allocate space for and copy in the array of 1201 * component pathnames and device numbers. 1202 */ 1203 cpp = kmem_alloc(ccio->ccio_ndisks * sizeof(*cpp), KM_SLEEP); 1204 vpp = kmem_alloc(ccio->ccio_ndisks * sizeof(*vpp), KM_SLEEP); 1205 error = copyin(ccio->ccio_disks, cpp, 1206 ccio->ccio_ndisks * sizeof(*cpp)); 1207 if (error) { 1208 kmem_free(vpp, ccio->ccio_ndisks * sizeof(*vpp)); 1209 kmem_free(cpp, ccio->ccio_ndisks * sizeof(*cpp)); 1210 goto out; 1211 } 1212 1213 #ifdef DEBUG 1214 if (ccddebug & CCDB_INIT) 1215 for (i = 0; i < ccio->ccio_ndisks; ++i) 1216 printf("ccdioctl: component %d: %p\n", 1217 i, cpp[i]); 1218 #endif 1219 1220 for (i = 0; i < ccio->ccio_ndisks; ++i) { 1221 #ifdef DEBUG 1222 if (ccddebug & CCDB_INIT) 1223 printf("ccdioctl: lookedup = %d\n", lookedup); 1224 #endif 1225 error = pathbuf_copyin(cpp[i], &pb); 1226 if (error == 0) { 1227 error = dk_lookup(pb, l, &vpp[i]); 1228 } 1229 pathbuf_destroy(pb); 1230 if (error != 0) { 1231 for (j = 0; j < lookedup; ++j) 1232 (void)vn_close(vpp[j], FREAD|FWRITE, 1233 uc); 1234 kmem_free(vpp, ccio->ccio_ndisks * 1235 sizeof(*vpp)); 1236 kmem_free(cpp, ccio->ccio_ndisks * 1237 sizeof(*cpp)); 1238 goto out; 1239 } 1240 ++lookedup; 1241 } 1242 1243 /* Attach the disk. */ 1244 disk_attach(&cs->sc_dkdev); 1245 bufq_alloc(&cs->sc_bufq, "fcfs", 0); 1246 1247 /* 1248 * Initialize the ccd. Fills in the softc for us. 1249 */ 1250 if ((error = ccdinit(cs, cpp, vpp, l)) != 0) { 1251 for (j = 0; j < lookedup; ++j) 1252 (void)vn_close(vpp[j], FREAD|FWRITE, 1253 uc); 1254 kmem_free(vpp, ccio->ccio_ndisks * sizeof(*vpp)); 1255 kmem_free(cpp, ccio->ccio_ndisks * sizeof(*cpp)); 1256 disk_detach(&cs->sc_dkdev); 1257 mutex_exit(&cs->sc_dvlock); 1258 bufq_free(cs->sc_bufq); 1259 return error; 1260 } 1261 1262 /* We can free the temporary variables now. */ 1263 kmem_free(vpp, ccio->ccio_ndisks * sizeof(*vpp)); 1264 kmem_free(cpp, ccio->ccio_ndisks * sizeof(*cpp)); 1265 1266 /* 1267 * The ccd has been successfully initialized, so 1268 * we can place it into the array. Don't try to 1269 * read the disklabel until the disk has been attached, 1270 * because space for the disklabel is allocated 1271 * in disk_attach(); 1272 */ 1273 ccio->ccio_unit = unit; 1274 ccio->ccio_size = cs->sc_size; 1275 1276 /* Try and read the disklabel. */ 1277 ccdgetdisklabel(dev); 1278 disk_set_info(NULL, &cs->sc_dkdev, NULL); 1279 1280 /* discover wedges */ 1281 mutex_exit(&cs->sc_dvlock); 1282 dkwedge_discover(&cs->sc_dkdev); 1283 return 0; 1284 1285 case CCDIOCCLR: 1286 /* 1287 * Don't unconfigure if any other partitions are open 1288 * or if both the character and block flavors of this 1289 * partition are open. 1290 */ 1291 part = DISKPART(dev); 1292 pmask = (1 << part); 1293 if ((cs->sc_dkdev.dk_openmask & ~pmask) || 1294 ((cs->sc_dkdev.dk_bopenmask & pmask) && 1295 (cs->sc_dkdev.dk_copenmask & pmask))) { 1296 error = EBUSY; 1297 goto out; 1298 } 1299 1300 /* Delete all of our wedges. */ 1301 dkwedge_delall(&cs->sc_dkdev); 1302 1303 /* Stop new I/O, wait for in-flight I/O to complete. */ 1304 mutex_enter(cs->sc_iolock); 1305 cs->sc_flags &= ~(CCDF_INITED|CCDF_VLABEL); 1306 cs->sc_zap = true; 1307 while (disk_isbusy(&cs->sc_dkdev) || 1308 bufq_peek(cs->sc_bufq) != NULL || 1309 cs->sc_thread != NULL) { 1310 cv_broadcast(&cs->sc_push); 1311 (void)cv_timedwait(&cs->sc_stop, cs->sc_iolock, hz); 1312 } 1313 mutex_exit(cs->sc_iolock); 1314 1315 /* 1316 * Free ccd_softc information and clear entry. 1317 */ 1318 1319 /* Close the components and free their pathnames. */ 1320 for (i = 0; i < cs->sc_nccdisks; ++i) { 1321 /* 1322 * XXX: this close could potentially fail and 1323 * cause Bad Things. Maybe we need to force 1324 * the close to happen? 1325 */ 1326 #ifdef DEBUG 1327 if (ccddebug & CCDB_VNODE) 1328 vprint("CCDIOCCLR: vnode info", 1329 cs->sc_cinfo[i].ci_vp); 1330 #endif 1331 (void)vn_close(cs->sc_cinfo[i].ci_vp, FREAD|FWRITE, 1332 uc); 1333 kmem_free(cs->sc_cinfo[i].ci_path, 1334 cs->sc_cinfo[i].ci_pathlen); 1335 } 1336 1337 /* Free interleave index. */ 1338 for (i = 0; cs->sc_itable[i].ii_ndisk; ++i) { 1339 kmem_free(cs->sc_itable[i].ii_index, 1340 cs->sc_itable[i].ii_indexsz); 1341 } 1342 1343 /* Free component info and interleave table. */ 1344 kmem_free(cs->sc_cinfo, cs->sc_nccdisks * 1345 sizeof(struct ccdcinfo)); 1346 kmem_free(cs->sc_itable, (cs->sc_nccdisks + 1) * 1347 sizeof(struct ccdiinfo)); 1348 1349 aprint_normal("%s: detached\n", cs->sc_xname); 1350 1351 /* Detach the disk. */ 1352 disk_detach(&cs->sc_dkdev); 1353 bufq_free(cs->sc_bufq); 1354 ccdput(cs); 1355 /* Don't break, otherwise cs is read again. */ 1356 return 0; 1357 1358 case DIOCGSTRATEGY: 1359 { 1360 struct disk_strategy *dks = (void *)data; 1361 1362 mutex_enter(cs->sc_iolock); 1363 if (cs->sc_bufq != NULL) 1364 strlcpy(dks->dks_name, 1365 bufq_getstrategyname(cs->sc_bufq), 1366 sizeof(dks->dks_name)); 1367 else 1368 error = EINVAL; 1369 mutex_exit(cs->sc_iolock); 1370 dks->dks_paramlen = 0; 1371 break; 1372 } 1373 1374 case DIOCGCACHE: 1375 { 1376 int dkcache = 0; 1377 1378 /* 1379 * We pass this call down to all components and report 1380 * intersection of the flags returned by the components. 1381 * If any errors out, we return error. CCD components 1382 * can not change unless the device is unconfigured, so 1383 * device feature flags will remain static. RCE/WCE can change 1384 * of course, if set directly on underlying device. 1385 */ 1386 for (error = 0, i = 0; i < cs->sc_nccdisks; i++) { 1387 error = VOP_IOCTL(cs->sc_cinfo[i].ci_vp, cmd, &j, 1388 flag, uc); 1389 if (error) 1390 break; 1391 1392 if (i == 0) 1393 dkcache = j; 1394 else 1395 dkcache = DKCACHE_COMBINE(dkcache, j); 1396 } 1397 1398 *((int *)data) = dkcache; 1399 break; 1400 } 1401 1402 case DIOCCACHESYNC: 1403 /* 1404 * We pass this call down to all components and report 1405 * the first error we encounter. 1406 */ 1407 for (error = 0, i = 0; i < cs->sc_nccdisks; i++) { 1408 j = VOP_IOCTL(cs->sc_cinfo[i].ci_vp, cmd, data, 1409 flag, uc); 1410 if (j != 0 && error == 0) 1411 error = j; 1412 } 1413 break; 1414 1415 case DIOCWDINFO: 1416 case DIOCSDINFO: 1417 #ifdef __HAVE_OLD_DISKLABEL 1418 case ODIOCWDINFO: 1419 case ODIOCSDINFO: 1420 #endif 1421 { 1422 struct disklabel *lp; 1423 #ifdef __HAVE_OLD_DISKLABEL 1424 if (cmd == ODIOCSDINFO || cmd == ODIOCWDINFO) { 1425 memset(&newlabel, 0, sizeof newlabel); 1426 memcpy(&newlabel, data, sizeof (struct olddisklabel)); 1427 lp = &newlabel; 1428 } else 1429 #endif 1430 lp = (struct disklabel *)data; 1431 1432 cs->sc_flags |= CCDF_LABELLING; 1433 1434 error = setdisklabel(cs->sc_dkdev.dk_label, 1435 lp, 0, cs->sc_dkdev.dk_cpulabel); 1436 if (error == 0) { 1437 if (cmd == DIOCWDINFO 1438 #ifdef __HAVE_OLD_DISKLABEL 1439 || cmd == ODIOCWDINFO 1440 #endif 1441 ) 1442 error = writedisklabel(CCDLABELDEV(dev), 1443 ccdstrategy, cs->sc_dkdev.dk_label, 1444 cs->sc_dkdev.dk_cpulabel); 1445 } 1446 1447 cs->sc_flags &= ~CCDF_LABELLING; 1448 break; 1449 } 1450 1451 case DIOCKLABEL: 1452 if (*(int *)data != 0) 1453 cs->sc_flags |= CCDF_KLABEL; 1454 else 1455 cs->sc_flags &= ~CCDF_KLABEL; 1456 break; 1457 1458 case DIOCWLABEL: 1459 if (*(int *)data != 0) 1460 cs->sc_flags |= CCDF_WLABEL; 1461 else 1462 cs->sc_flags &= ~CCDF_WLABEL; 1463 break; 1464 1465 case DIOCGDEFLABEL: 1466 ccdgetdefaultlabel(cs, (struct disklabel *)data); 1467 break; 1468 1469 #ifdef __HAVE_OLD_DISKLABEL 1470 case ODIOCGDEFLABEL: 1471 ccdgetdefaultlabel(cs, &newlabel); 1472 if (newlabel.d_npartitions > OLDMAXPARTITIONS) 1473 return ENOTTY; 1474 memcpy(data, &newlabel, sizeof (struct olddisklabel)); 1475 break; 1476 #endif 1477 1478 default: 1479 error = ENOTTY; 1480 } 1481 1482 out: 1483 mutex_exit(&cs->sc_dvlock); 1484 return (error); 1485 } 1486 1487 static int 1488 ccdsize(dev_t dev) 1489 { 1490 struct ccd_softc *cs; 1491 struct disklabel *lp; 1492 int part, unit, omask, size; 1493 1494 unit = ccdunit(dev); 1495 if ((cs = ccdget(unit, 0)) == NULL) 1496 return -1; 1497 1498 if ((cs->sc_flags & CCDF_INITED) == 0) 1499 return (-1); 1500 1501 part = DISKPART(dev); 1502 omask = cs->sc_dkdev.dk_openmask & (1 << part); 1503 lp = cs->sc_dkdev.dk_label; 1504 1505 if (omask == 0 && ccdopen(dev, 0, S_IFBLK, curlwp)) 1506 return (-1); 1507 1508 if (lp->d_partitions[part].p_fstype != FS_SWAP) 1509 size = -1; 1510 else 1511 size = lp->d_partitions[part].p_size * 1512 (lp->d_secsize / DEV_BSIZE); 1513 1514 if (omask == 0 && ccdclose(dev, 0, S_IFBLK, curlwp)) 1515 return (-1); 1516 1517 return (size); 1518 } 1519 1520 static void 1521 ccdgetdefaultlabel(struct ccd_softc *cs, struct disklabel *lp) 1522 { 1523 struct ccdgeom *ccg = &cs->sc_geom; 1524 1525 memset(lp, 0, sizeof(*lp)); 1526 1527 if (cs->sc_size > UINT32_MAX) 1528 lp->d_secperunit = UINT32_MAX; 1529 else 1530 lp->d_secperunit = cs->sc_size; 1531 lp->d_secsize = ccg->ccg_secsize; 1532 lp->d_nsectors = ccg->ccg_nsectors; 1533 lp->d_ntracks = ccg->ccg_ntracks; 1534 lp->d_ncylinders = ccg->ccg_ncylinders; 1535 lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors; 1536 1537 strncpy(lp->d_typename, "ccd", sizeof(lp->d_typename)); 1538 lp->d_type = DKTYPE_CCD; 1539 strncpy(lp->d_packname, "fictitious", sizeof(lp->d_packname)); 1540 lp->d_rpm = 3600; 1541 lp->d_interleave = 1; 1542 lp->d_flags = 0; 1543 1544 lp->d_partitions[RAW_PART].p_offset = 0; 1545 lp->d_partitions[RAW_PART].p_size = lp->d_secperunit; 1546 lp->d_partitions[RAW_PART].p_fstype = FS_UNUSED; 1547 lp->d_npartitions = RAW_PART + 1; 1548 1549 lp->d_magic = DISKMAGIC; 1550 lp->d_magic2 = DISKMAGIC; 1551 lp->d_checksum = dkcksum(cs->sc_dkdev.dk_label); 1552 } 1553 1554 /* 1555 * Read the disklabel from the ccd. If one is not present, fake one 1556 * up. 1557 */ 1558 static void 1559 ccdgetdisklabel(dev_t dev) 1560 { 1561 int unit = ccdunit(dev); 1562 struct ccd_softc *cs; 1563 const char *errstring; 1564 struct disklabel *lp; 1565 struct cpu_disklabel *clp; 1566 1567 if ((cs = ccdget(unit, 0)) == NULL) 1568 return; 1569 lp = cs->sc_dkdev.dk_label; 1570 clp = cs->sc_dkdev.dk_cpulabel; 1571 KASSERT(mutex_owned(&cs->sc_dvlock)); 1572 1573 memset(clp, 0, sizeof(*clp)); 1574 1575 ccdgetdefaultlabel(cs, lp); 1576 1577 /* 1578 * Call the generic disklabel extraction routine. 1579 */ 1580 cs->sc_flags |= CCDF_RLABEL; 1581 if ((cs->sc_flags & CCDF_NOLABEL) != 0) 1582 errstring = "CCDF_NOLABEL set; ignoring on-disk label"; 1583 else 1584 errstring = readdisklabel(CCDLABELDEV(dev), ccdstrategy, 1585 cs->sc_dkdev.dk_label, cs->sc_dkdev.dk_cpulabel); 1586 if (errstring) 1587 ccdmakedisklabel(cs); 1588 else { 1589 int i; 1590 struct partition *pp; 1591 1592 /* 1593 * Sanity check whether the found disklabel is valid. 1594 * 1595 * This is necessary since total size of ccd may vary 1596 * when an interleave is changed even though exactly 1597 * same componets are used, and old disklabel may used 1598 * if that is found. 1599 */ 1600 if (lp->d_secperunit < UINT32_MAX ? 1601 lp->d_secperunit != cs->sc_size : 1602 lp->d_secperunit > cs->sc_size) 1603 printf("WARNING: %s: " 1604 "total sector size in disklabel (%ju) != " 1605 "the size of ccd (%ju)\n", cs->sc_xname, 1606 (uintmax_t)lp->d_secperunit, 1607 (uintmax_t)cs->sc_size); 1608 for (i = 0; i < lp->d_npartitions; i++) { 1609 pp = &lp->d_partitions[i]; 1610 if (pp->p_offset + pp->p_size > cs->sc_size) 1611 printf("WARNING: %s: end of partition `%c' " 1612 "exceeds the size of ccd (%ju)\n", 1613 cs->sc_xname, 'a' + i, (uintmax_t)cs->sc_size); 1614 } 1615 } 1616 1617 #ifdef DEBUG 1618 /* It's actually extremely common to have unlabeled ccds. */ 1619 if (ccddebug & CCDB_LABEL) 1620 if (errstring != NULL) 1621 printf("%s: %s\n", cs->sc_xname, errstring); 1622 #endif 1623 1624 /* In-core label now valid. */ 1625 cs->sc_flags = (cs->sc_flags | CCDF_VLABEL) & ~CCDF_RLABEL; 1626 } 1627 1628 /* 1629 * Take care of things one might want to take care of in the event 1630 * that a disklabel isn't present. 1631 */ 1632 static void 1633 ccdmakedisklabel(struct ccd_softc *cs) 1634 { 1635 struct disklabel *lp = cs->sc_dkdev.dk_label; 1636 1637 /* 1638 * For historical reasons, if there's no disklabel present 1639 * the raw partition must be marked FS_BSDFFS. 1640 */ 1641 lp->d_partitions[RAW_PART].p_fstype = FS_BSDFFS; 1642 1643 strncpy(lp->d_packname, "default label", sizeof(lp->d_packname)); 1644 1645 lp->d_checksum = dkcksum(lp); 1646 } 1647 1648 #ifdef DEBUG 1649 static void 1650 printiinfo(struct ccdiinfo *ii) 1651 { 1652 int ix, i; 1653 1654 for (ix = 0; ii->ii_ndisk; ix++, ii++) { 1655 printf(" itab[%d]: #dk %d sblk %" PRId64 " soff %" PRId64, 1656 ix, ii->ii_ndisk, ii->ii_startblk, ii->ii_startoff); 1657 for (i = 0; i < ii->ii_ndisk; i++) 1658 printf(" %d", ii->ii_index[i]); 1659 printf("\n"); 1660 } 1661 } 1662 #endif 1663 1664 MODULE(MODULE_CLASS_DRIVER, ccd, "dk_subr,bufq_fcfs"); 1665 1666 static int 1667 ccd_modcmd(modcmd_t cmd, void *arg) 1668 { 1669 int error = 0; 1670 #ifdef _MODULE 1671 int bmajor = -1, cmajor = -1; 1672 #endif 1673 1674 1675 switch (cmd) { 1676 case MODULE_CMD_INIT: 1677 #ifdef _MODULE 1678 ccdattach(0); 1679 1680 error = devsw_attach("ccd", &ccd_bdevsw, &bmajor, 1681 &ccd_cdevsw, &cmajor); 1682 sysctl_kern_ccd_setup(&ccd_clog); 1683 #endif 1684 break; 1685 1686 case MODULE_CMD_FINI: 1687 #ifdef _MODULE 1688 mutex_enter(&ccd_lock); 1689 if (!LIST_EMPTY(&ccds)) { 1690 mutex_exit(&ccd_lock); 1691 error = EBUSY; 1692 } else { 1693 mutex_exit(&ccd_lock); 1694 error = devsw_detach(&ccd_bdevsw, &ccd_cdevsw); 1695 ccddetach(); 1696 } 1697 sysctl_teardown(&ccd_clog); 1698 #endif 1699 break; 1700 1701 case MODULE_CMD_STAT: 1702 return ENOTTY; 1703 1704 default: 1705 return ENOTTY; 1706 } 1707 1708 return error; 1709 } 1710 1711 static int 1712 ccd_units_sysctl(SYSCTLFN_ARGS) 1713 { 1714 struct sysctlnode node; 1715 struct ccd_softc *sc; 1716 int error, i, nccd, *units; 1717 size_t size; 1718 1719 nccd = 0; 1720 mutex_enter(&ccd_lock); 1721 LIST_FOREACH(sc, &ccds, sc_link) 1722 nccd++; 1723 mutex_exit(&ccd_lock); 1724 1725 if (nccd != 0) { 1726 size = nccd * sizeof(*units); 1727 units = kmem_zalloc(size, KM_SLEEP); 1728 i = 0; 1729 mutex_enter(&ccd_lock); 1730 LIST_FOREACH(sc, &ccds, sc_link) { 1731 if (i >= nccd) 1732 break; 1733 units[i] = sc->sc_unit; 1734 } 1735 mutex_exit(&ccd_lock); 1736 } else { 1737 units = NULL; 1738 size = 0; 1739 } 1740 1741 node = *rnode; 1742 node.sysctl_data = units; 1743 node.sysctl_size = size; 1744 1745 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1746 if (units) 1747 kmem_free(units, size); 1748 return error; 1749 } 1750 1751 static int 1752 ccd_info_sysctl(SYSCTLFN_ARGS) 1753 { 1754 struct sysctlnode node; 1755 struct ccddiskinfo ccd; 1756 struct ccd_softc *sc; 1757 int unit; 1758 1759 if (newp == NULL || newlen != sizeof(int)) 1760 return EINVAL; 1761 1762 unit = *(const int *)newp; 1763 newp = NULL; 1764 newlen = 0; 1765 ccd.ccd_ndisks = ~0; 1766 mutex_enter(&ccd_lock); 1767 LIST_FOREACH(sc, &ccds, sc_link) { 1768 if (sc->sc_unit == unit) { 1769 ccd.ccd_ileave = sc->sc_ileave; 1770 ccd.ccd_size = sc->sc_size; 1771 ccd.ccd_ndisks = sc->sc_nccdisks; 1772 ccd.ccd_flags = sc->sc_flags; 1773 break; 1774 } 1775 } 1776 mutex_exit(&ccd_lock); 1777 1778 if (ccd.ccd_ndisks == ~0) 1779 return ENOENT; 1780 1781 node = *rnode; 1782 node.sysctl_data = &ccd; 1783 node.sysctl_size = sizeof(ccd); 1784 1785 return sysctl_lookup(SYSCTLFN_CALL(&node)); 1786 } 1787 1788 static int 1789 ccd_components_sysctl(SYSCTLFN_ARGS) 1790 { 1791 struct sysctlnode node; 1792 int error, unit; 1793 size_t size; 1794 char *names, *p, *ep; 1795 struct ccd_softc *sc; 1796 1797 if (newp == NULL || newlen != sizeof(int)) 1798 return EINVAL; 1799 1800 size = 0; 1801 unit = *(const int *)newp; 1802 newp = NULL; 1803 newlen = 0; 1804 mutex_enter(&ccd_lock); 1805 LIST_FOREACH(sc, &ccds, sc_link) 1806 if (sc->sc_unit == unit) { 1807 for (size_t i = 0; i < sc->sc_nccdisks; i++) 1808 size += strlen(sc->sc_cinfo[i].ci_path) + 1; 1809 break; 1810 } 1811 mutex_exit(&ccd_lock); 1812 1813 if (size == 0) 1814 return ENOENT; 1815 names = kmem_zalloc(size, KM_SLEEP); 1816 p = names; 1817 ep = names + size; 1818 mutex_enter(&ccd_lock); 1819 LIST_FOREACH(sc, &ccds, sc_link) 1820 if (sc->sc_unit == unit) { 1821 for (size_t i = 0; i < sc->sc_nccdisks; i++) { 1822 char *d = sc->sc_cinfo[i].ci_path; 1823 while (p < ep && (*p++ = *d++) != '\0') 1824 continue; 1825 } 1826 break; 1827 } 1828 mutex_exit(&ccd_lock); 1829 1830 node = *rnode; 1831 node.sysctl_data = names; 1832 node.sysctl_size = ep - names; 1833 1834 error = sysctl_lookup(SYSCTLFN_CALL(&node)); 1835 kmem_free(names, size); 1836 return error; 1837 } 1838 1839 SYSCTL_SETUP(sysctl_kern_ccd_setup, "sysctl kern.ccd subtree setup") 1840 { 1841 const struct sysctlnode *node = NULL; 1842 1843 sysctl_createv(clog, 0, NULL, &node, 1844 CTLFLAG_PERMANENT, 1845 CTLTYPE_NODE, "ccd", 1846 SYSCTL_DESCR("ConCatenated Disk state"), 1847 NULL, 0, NULL, 0, 1848 CTL_KERN, CTL_CREATE, CTL_EOL); 1849 1850 if (node == NULL) 1851 return; 1852 1853 sysctl_createv(clog, 0, &node, NULL, 1854 CTLFLAG_PERMANENT | CTLFLAG_READONLY, 1855 CTLTYPE_STRUCT, "units", 1856 SYSCTL_DESCR("List of ccd unit numbers"), 1857 ccd_units_sysctl, 0, NULL, 0, 1858 CTL_CREATE, CTL_EOL); 1859 sysctl_createv(clog, 0, &node, NULL, 1860 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 1861 CTLTYPE_STRUCT, "info", 1862 SYSCTL_DESCR("Information about a CCD unit"), 1863 ccd_info_sysctl, 0, NULL, 0, 1864 CTL_CREATE, CTL_EOL); 1865 sysctl_createv(clog, 0, &node, NULL, 1866 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 1867 CTLTYPE_STRUCT, "components", 1868 SYSCTL_DESCR("Information about CCD components"), 1869 ccd_components_sysctl, 0, NULL, 0, 1870 CTL_CREATE, CTL_EOL); 1871 } 1872
Indexes created Thu Oct 02 14:10:14 GMT 2025