| 1 | /* $NetBSD: device-mapper.c,v 1.38 2016/07/11 11:31:50 msaitoh Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 2010 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Adam Hamsik. |
| 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 | * I want to say thank you to all people who helped me with this project. |
| 34 | */ |
| 35 | |
| 36 | #include <sys/types.h> |
| 37 | #include <sys/param.h> |
| 38 | |
| 39 | #include <sys/buf.h> |
| 40 | #include <sys/conf.h> |
| 41 | #include <sys/device.h> |
| 42 | #include <sys/dkio.h> |
| 43 | #include <sys/disk.h> |
| 44 | #include <sys/disklabel.h> |
| 45 | #include <sys/ioctl.h> |
| 46 | #include <sys/ioccom.h> |
| 47 | #include <sys/kmem.h> |
| 48 | #include <sys/kauth.h> |
| 49 | |
| 50 | #include "netbsd-dm.h" |
| 51 | #include "dm.h" |
| 52 | #include "ioconf.h" |
| 53 | |
| 54 | static dev_type_open(dmopen); |
| 55 | static dev_type_close(dmclose); |
| 56 | static dev_type_read(dmread); |
| 57 | static dev_type_write(dmwrite); |
| 58 | static dev_type_ioctl(dmioctl); |
| 59 | static dev_type_strategy(dmstrategy); |
| 60 | static dev_type_size(dmsize); |
| 61 | |
| 62 | /* attach and detach routines */ |
| 63 | #ifdef _MODULE |
| 64 | static int dmdestroy(void); |
| 65 | #endif |
| 66 | |
| 67 | static void dm_doinit(void); |
| 68 | |
| 69 | static int dm_cmd_to_fun(prop_dictionary_t); |
| 70 | static int disk_ioctl_switch(dev_t, u_long, void *); |
| 71 | static int dm_ioctl_switch(u_long); |
| 72 | static void dmminphys(struct buf *); |
| 73 | |
| 74 | /* CF attach/detach functions used for power management */ |
| 75 | static int dm_detach(device_t, int); |
| 76 | static void dm_attach(device_t, device_t, void *); |
| 77 | static int dm_match(device_t, cfdata_t, void *); |
| 78 | |
| 79 | /* ***Variable-definitions*** */ |
| 80 | const struct bdevsw dm_bdevsw = { |
| 81 | .d_open = dmopen, |
| 82 | .d_close = dmclose, |
| 83 | .d_strategy = dmstrategy, |
| 84 | .d_ioctl = dmioctl, |
| 85 | .d_dump = nodump, |
| 86 | .d_psize = dmsize, |
| 87 | .d_discard = nodiscard, |
| 88 | .d_flag = D_DISK | D_MPSAFE |
| 89 | }; |
| 90 | |
| 91 | const struct cdevsw dm_cdevsw = { |
| 92 | .d_open = dmopen, |
| 93 | .d_close = dmclose, |
| 94 | .d_read = dmread, |
| 95 | .d_write = dmwrite, |
| 96 | .d_ioctl = dmioctl, |
| 97 | .d_stop = nostop, |
| 98 | .d_tty = notty, |
| 99 | .d_poll = nopoll, |
| 100 | .d_mmap = nommap, |
| 101 | .d_kqfilter = nokqfilter, |
| 102 | .d_discard = nodiscard, |
| 103 | .d_flag = D_DISK | D_MPSAFE |
| 104 | }; |
| 105 | |
| 106 | const struct dkdriver dmdkdriver = { |
| 107 | .d_strategy = dmstrategy |
| 108 | }; |
| 109 | |
| 110 | CFATTACH_DECL3_NEW(dm, 0, |
| 111 | dm_match, dm_attach, dm_detach, NULL, NULL, NULL, |
| 112 | DVF_DETACH_SHUTDOWN); |
| 113 | |
| 114 | extern struct cfdriver dm_cd; |
| 115 | |
| 116 | extern uint32_t dm_dev_counter; |
| 117 | |
| 118 | /* |
| 119 | * This array is used to translate cmd to function pointer. |
| 120 | * |
| 121 | * Interface between libdevmapper and lvm2tools uses different |
| 122 | * names for one IOCTL call because libdevmapper do another thing |
| 123 | * then. When I run "info" or "mknodes" libdevmapper will send same |
| 124 | * ioctl to kernel but will do another things in userspace. |
| 125 | * |
| 126 | */ |
| 127 | static const struct cmd_function cmd_fn[] = { |
| 128 | { .cmd = "version" , .fn = dm_get_version_ioctl, .allowed = 1 }, |
| 129 | { .cmd = "targets" , .fn = dm_list_versions_ioctl, .allowed = 1 }, |
| 130 | { .cmd = "create" , .fn = dm_dev_create_ioctl, .allowed = 0 }, |
| 131 | { .cmd = "info" , .fn = dm_dev_status_ioctl, .allowed = 1 }, |
| 132 | { .cmd = "mknodes" , .fn = dm_dev_status_ioctl, .allowed = 1 }, |
| 133 | { .cmd = "names" , .fn = dm_dev_list_ioctl, .allowed = 1 }, |
| 134 | { .cmd = "suspend" , .fn = dm_dev_suspend_ioctl, .allowed = 0 }, |
| 135 | { .cmd = "remove" , .fn = dm_dev_remove_ioctl, .allowed = 0 }, |
| 136 | { .cmd = "rename" , .fn = dm_dev_rename_ioctl, .allowed = 0 }, |
| 137 | { .cmd = "resume" , .fn = dm_dev_resume_ioctl, .allowed = 0 }, |
| 138 | { .cmd = "clear" , .fn = dm_table_clear_ioctl, .allowed = 0 }, |
| 139 | { .cmd = "deps" , .fn = dm_table_deps_ioctl, .allowed = 1 }, |
| 140 | { .cmd = "reload" , .fn = dm_table_load_ioctl, .allowed = 0 }, |
| 141 | { .cmd = "status" , .fn = dm_table_status_ioctl, .allowed = 1 }, |
| 142 | { .cmd = "table" , .fn = dm_table_status_ioctl, .allowed = 1 }, |
| 143 | { .cmd = NULL, .fn = NULL, .allowed = 0 } |
| 144 | }; |
| 145 | |
| 146 | #ifdef _MODULE |
| 147 | #include <sys/module.h> |
| 148 | |
| 149 | /* Autoconf defines */ |
| 150 | CFDRIVER_DECL(dm, DV_DISK, NULL); |
| 151 | |
| 152 | MODULE(MODULE_CLASS_DRIVER, dm, "dk_subr" ); |
| 153 | |
| 154 | /* New module handle routine */ |
| 155 | static int |
| 156 | dm_modcmd(modcmd_t cmd, void *arg) |
| 157 | { |
| 158 | #ifdef _MODULE |
| 159 | int error; |
| 160 | devmajor_t bmajor, cmajor; |
| 161 | |
| 162 | error = 0; |
| 163 | bmajor = -1; |
| 164 | cmajor = -1; |
| 165 | |
| 166 | switch (cmd) { |
| 167 | case MODULE_CMD_INIT: |
| 168 | error = config_cfdriver_attach(&dm_cd); |
| 169 | if (error) |
| 170 | break; |
| 171 | |
| 172 | error = config_cfattach_attach(dm_cd.cd_name, &dm_ca); |
| 173 | if (error) { |
| 174 | aprint_error("%s: unable to register cfattach\n" , |
| 175 | dm_cd.cd_name); |
| 176 | return error; |
| 177 | } |
| 178 | |
| 179 | error = devsw_attach(dm_cd.cd_name, &dm_bdevsw, &bmajor, |
| 180 | &dm_cdevsw, &cmajor); |
| 181 | if (error == EEXIST) |
| 182 | error = 0; |
| 183 | if (error) { |
| 184 | config_cfattach_detach(dm_cd.cd_name, &dm_ca); |
| 185 | config_cfdriver_detach(&dm_cd); |
| 186 | break; |
| 187 | } |
| 188 | |
| 189 | dm_doinit(); |
| 190 | |
| 191 | break; |
| 192 | |
| 193 | case MODULE_CMD_FINI: |
| 194 | /* |
| 195 | * Disable unloading of dm module if there are any devices |
| 196 | * defined in driver. This is probably too strong we need |
| 197 | * to disable auto-unload only if there is mounted dm device |
| 198 | * present. |
| 199 | */ |
| 200 | if (dm_dev_counter > 0) |
| 201 | return EBUSY; |
| 202 | |
| 203 | error = dmdestroy(); |
| 204 | if (error) |
| 205 | break; |
| 206 | |
| 207 | config_cfdriver_detach(&dm_cd); |
| 208 | |
| 209 | devsw_detach(&dm_bdevsw, &dm_cdevsw); |
| 210 | break; |
| 211 | case MODULE_CMD_STAT: |
| 212 | return ENOTTY; |
| 213 | |
| 214 | default: |
| 215 | return ENOTTY; |
| 216 | } |
| 217 | |
| 218 | return error; |
| 219 | #else |
| 220 | return ENOTTY; |
| 221 | #endif |
| 222 | } |
| 223 | #endif /* _MODULE */ |
| 224 | |
| 225 | /* |
| 226 | * dm_match: |
| 227 | * |
| 228 | * Autoconfiguration match function for pseudo-device glue. |
| 229 | */ |
| 230 | static int |
| 231 | dm_match(device_t parent, cfdata_t match, void *aux) |
| 232 | { |
| 233 | |
| 234 | /* Pseudo-device; always present. */ |
| 235 | return (1); |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * dm_attach: |
| 240 | * |
| 241 | * Autoconfiguration attach function for pseudo-device glue. |
| 242 | */ |
| 243 | static void |
| 244 | dm_attach(device_t parent, device_t self, void *aux) |
| 245 | { |
| 246 | return; |
| 247 | } |
| 248 | |
| 249 | |
| 250 | /* |
| 251 | * dm_detach: |
| 252 | * |
| 253 | * Autoconfiguration detach function for pseudo-device glue. |
| 254 | * This routine is called by dm_ioctl::dm_dev_remove_ioctl and by autoconf to |
| 255 | * remove devices created in device-mapper. |
| 256 | */ |
| 257 | static int |
| 258 | dm_detach(device_t self, int flags) |
| 259 | { |
| 260 | dm_dev_t *dmv; |
| 261 | |
| 262 | /* Detach device from global device list */ |
| 263 | if ((dmv = dm_dev_detach(self)) == NULL) |
| 264 | return ENOENT; |
| 265 | |
| 266 | /* Destroy active table first. */ |
| 267 | dm_table_destroy(&dmv->table_head, DM_TABLE_ACTIVE); |
| 268 | |
| 269 | /* Destroy inactive table if exits, too. */ |
| 270 | dm_table_destroy(&dmv->table_head, DM_TABLE_INACTIVE); |
| 271 | |
| 272 | dm_table_head_destroy(&dmv->table_head); |
| 273 | |
| 274 | /* Destroy disk device structure */ |
| 275 | disk_detach(dmv->diskp); |
| 276 | disk_destroy(dmv->diskp); |
| 277 | |
| 278 | /* Destroy device */ |
| 279 | (void)dm_dev_free(dmv); |
| 280 | |
| 281 | /* Decrement device counter After removing device */ |
| 282 | atomic_dec_32(&dm_dev_counter); |
| 283 | |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static void |
| 288 | dm_doinit(void) |
| 289 | { |
| 290 | dm_target_init(); |
| 291 | dm_dev_init(); |
| 292 | dm_pdev_init(); |
| 293 | } |
| 294 | |
| 295 | /* attach routine */ |
| 296 | void |
| 297 | dmattach(int n) |
| 298 | { |
| 299 | int error; |
| 300 | |
| 301 | error = config_cfattach_attach(dm_cd.cd_name, &dm_ca); |
| 302 | if (error) { |
| 303 | aprint_error("%s: unable to register cfattach\n" , |
| 304 | dm_cd.cd_name); |
| 305 | } else { |
| 306 | dm_doinit(); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | #ifdef _MODULE |
| 311 | /* Destroy routine */ |
| 312 | static int |
| 313 | dmdestroy(void) |
| 314 | { |
| 315 | int error; |
| 316 | |
| 317 | error = config_cfattach_detach(dm_cd.cd_name, &dm_ca); |
| 318 | if (error) |
| 319 | return error; |
| 320 | |
| 321 | dm_dev_destroy(); |
| 322 | dm_pdev_destroy(); |
| 323 | dm_target_destroy(); |
| 324 | |
| 325 | return 0; |
| 326 | } |
| 327 | #endif /* _MODULE */ |
| 328 | |
| 329 | static int |
| 330 | dmopen(dev_t dev, int flags, int mode, struct lwp *l) |
| 331 | { |
| 332 | |
| 333 | aprint_debug("dm open routine called %" PRIu32 "\n" , minor(dev)); |
| 334 | return 0; |
| 335 | } |
| 336 | |
| 337 | static int |
| 338 | dmclose(dev_t dev, int flags, int mode, struct lwp *l) |
| 339 | { |
| 340 | |
| 341 | aprint_debug("dm close routine called %" PRIu32 "\n" , minor(dev)); |
| 342 | return 0; |
| 343 | } |
| 344 | |
| 345 | |
| 346 | static int |
| 347 | dmioctl(dev_t dev, const u_long cmd, void *data, int flag, struct lwp *l) |
| 348 | { |
| 349 | int r; |
| 350 | prop_dictionary_t dm_dict_in; |
| 351 | |
| 352 | r = 0; |
| 353 | |
| 354 | aprint_debug("dmioctl called\n" ); |
| 355 | KASSERT(data != NULL); |
| 356 | |
| 357 | if (( r = disk_ioctl_switch(dev, cmd, data)) == ENOTTY) { |
| 358 | struct plistref *pref = (struct plistref *) data; |
| 359 | |
| 360 | /* Check if we were called with NETBSD_DM_IOCTL ioctl |
| 361 | otherwise quit. */ |
| 362 | if ((r = dm_ioctl_switch(cmd)) != 0) |
| 363 | return r; |
| 364 | |
| 365 | if((r = prop_dictionary_copyin_ioctl(pref, cmd, &dm_dict_in)) |
| 366 | != 0) |
| 367 | return r; |
| 368 | |
| 369 | if ((r = dm_check_version(dm_dict_in)) != 0) |
| 370 | goto cleanup_exit; |
| 371 | |
| 372 | /* run ioctl routine */ |
| 373 | if ((r = dm_cmd_to_fun(dm_dict_in)) != 0) |
| 374 | goto cleanup_exit; |
| 375 | |
| 376 | cleanup_exit: |
| 377 | r = prop_dictionary_copyout_ioctl(pref, cmd, dm_dict_in); |
| 378 | prop_object_release(dm_dict_in); |
| 379 | } |
| 380 | |
| 381 | return r; |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Translate command sent from libdevmapper to func. |
| 386 | */ |
| 387 | static int |
| 388 | dm_cmd_to_fun(prop_dictionary_t dm_dict) |
| 389 | { |
| 390 | int i, r; |
| 391 | prop_string_t command; |
| 392 | |
| 393 | r = 0; |
| 394 | |
| 395 | if ((command = prop_dictionary_get(dm_dict, DM_IOCTL_COMMAND)) == NULL) |
| 396 | return EINVAL; |
| 397 | |
| 398 | for(i = 0; cmd_fn[i].cmd != NULL; i++) |
| 399 | if (prop_string_equals_cstring(command, cmd_fn[i].cmd)) |
| 400 | break; |
| 401 | |
| 402 | if (!cmd_fn[i].allowed && |
| 403 | (r = kauth_authorize_system(kauth_cred_get(), |
| 404 | KAUTH_SYSTEM_DEVMAPPER, 0, NULL, NULL, NULL)) != 0) |
| 405 | return r; |
| 406 | |
| 407 | if (cmd_fn[i].cmd == NULL) |
| 408 | return EINVAL; |
| 409 | |
| 410 | aprint_debug("ioctl %s called\n" , cmd_fn[i].cmd); |
| 411 | r = cmd_fn[i].fn(dm_dict); |
| 412 | |
| 413 | return r; |
| 414 | } |
| 415 | |
| 416 | /* Call apropriate ioctl handler function. */ |
| 417 | static int |
| 418 | dm_ioctl_switch(u_long cmd) |
| 419 | { |
| 420 | |
| 421 | switch(cmd) { |
| 422 | |
| 423 | case NETBSD_DM_IOCTL: |
| 424 | aprint_debug("dm NetBSD_DM_IOCTL called\n" ); |
| 425 | break; |
| 426 | default: |
| 427 | aprint_debug("dm unknown ioctl called\n" ); |
| 428 | return ENOTTY; |
| 429 | break; /* NOT REACHED */ |
| 430 | } |
| 431 | |
| 432 | return 0; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * Check for disk specific ioctls. |
| 437 | */ |
| 438 | |
| 439 | static int |
| 440 | disk_ioctl_switch(dev_t dev, u_long cmd, void *data) |
| 441 | { |
| 442 | dm_dev_t *dmv; |
| 443 | |
| 444 | /* disk ioctls make sense only on block devices */ |
| 445 | if (minor(dev) == 0) |
| 446 | return ENOTTY; |
| 447 | |
| 448 | switch(cmd) { |
| 449 | case DIOCGWEDGEINFO: |
| 450 | { |
| 451 | struct dkwedge_info *dkw = (void *) data; |
| 452 | unsigned secsize; |
| 453 | |
| 454 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) |
| 455 | return ENODEV; |
| 456 | |
| 457 | aprint_debug("DIOCGWEDGEINFO ioctl called\n" ); |
| 458 | |
| 459 | strlcpy(dkw->dkw_devname, dmv->name, 16); |
| 460 | strlcpy(dkw->dkw_wname, dmv->name, DM_NAME_LEN); |
| 461 | strlcpy(dkw->dkw_parent, dmv->name, 16); |
| 462 | |
| 463 | dkw->dkw_offset = 0; |
| 464 | dm_table_disksize(&dmv->table_head, &dkw->dkw_size, &secsize); |
| 465 | strcpy(dkw->dkw_ptype, DKW_PTYPE_FFS); |
| 466 | |
| 467 | dm_dev_unbusy(dmv); |
| 468 | break; |
| 469 | } |
| 470 | |
| 471 | case DIOCGDISKINFO: |
| 472 | { |
| 473 | struct plistref *pref = (struct plistref *) data; |
| 474 | |
| 475 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) |
| 476 | return ENODEV; |
| 477 | |
| 478 | if (dmv->diskp->dk_info == NULL) { |
| 479 | dm_dev_unbusy(dmv); |
| 480 | return ENOTSUP; |
| 481 | } else |
| 482 | prop_dictionary_copyout_ioctl(pref, cmd, |
| 483 | dmv->diskp->dk_info); |
| 484 | |
| 485 | dm_dev_unbusy(dmv); |
| 486 | break; |
| 487 | } |
| 488 | |
| 489 | case DIOCCACHESYNC: |
| 490 | { |
| 491 | dm_table_entry_t *table_en; |
| 492 | dm_table_t *tbl; |
| 493 | |
| 494 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) |
| 495 | return ENODEV; |
| 496 | |
| 497 | /* Select active table */ |
| 498 | tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); |
| 499 | |
| 500 | /* |
| 501 | * Call sync target routine for all table entries. Target sync |
| 502 | * routine basically call DIOCCACHESYNC on underlying devices. |
| 503 | */ |
| 504 | SLIST_FOREACH(table_en, tbl, next) |
| 505 | { |
| 506 | (void)table_en->target->sync(table_en); |
| 507 | } |
| 508 | dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); |
| 509 | dm_dev_unbusy(dmv); |
| 510 | break; |
| 511 | } |
| 512 | |
| 513 | |
| 514 | default: |
| 515 | aprint_debug("unknown disk_ioctl called\n" ); |
| 516 | return ENOTTY; |
| 517 | break; /* NOT REACHED */ |
| 518 | } |
| 519 | |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | /* |
| 524 | * Do all IO operations on dm logical devices. |
| 525 | */ |
| 526 | static void |
| 527 | dmstrategy(struct buf *bp) |
| 528 | { |
| 529 | dm_dev_t *dmv; |
| 530 | dm_table_t *tbl; |
| 531 | dm_table_entry_t *table_en; |
| 532 | struct buf *nestbuf; |
| 533 | |
| 534 | uint64_t buf_start, buf_len, issued_len; |
| 535 | uint64_t table_start, table_end; |
| 536 | uint64_t start, end; |
| 537 | |
| 538 | buf_start = bp->b_blkno * DEV_BSIZE; |
| 539 | buf_len = bp->b_bcount; |
| 540 | |
| 541 | tbl = NULL; |
| 542 | |
| 543 | table_end = 0; |
| 544 | issued_len = 0; |
| 545 | |
| 546 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(bp->b_dev))) == NULL) { |
| 547 | bp->b_error = EIO; |
| 548 | bp->b_resid = bp->b_bcount; |
| 549 | biodone(bp); |
| 550 | return; |
| 551 | } |
| 552 | |
| 553 | if (bounds_check_with_mediasize(bp, DEV_BSIZE, |
| 554 | dm_table_size(&dmv->table_head)) <= 0) { |
| 555 | dm_dev_unbusy(dmv); |
| 556 | bp->b_resid = bp->b_bcount; |
| 557 | biodone(bp); |
| 558 | return; |
| 559 | } |
| 560 | |
| 561 | /* |
| 562 | * disk(9) is part of device structure and it can't be used without |
| 563 | * mutual exclusion, use diskp_mtx until it will be fixed. |
| 564 | */ |
| 565 | mutex_enter(&dmv->diskp_mtx); |
| 566 | disk_busy(dmv->diskp); |
| 567 | mutex_exit(&dmv->diskp_mtx); |
| 568 | |
| 569 | /* Select active table */ |
| 570 | tbl = dm_table_get_entry(&dmv->table_head, DM_TABLE_ACTIVE); |
| 571 | |
| 572 | /* Nested buffers count down to zero therefore I have |
| 573 | to set bp->b_resid to maximal value. */ |
| 574 | bp->b_resid = bp->b_bcount; |
| 575 | |
| 576 | /* |
| 577 | * Find out what tables I want to select. |
| 578 | */ |
| 579 | SLIST_FOREACH(table_en, tbl, next) |
| 580 | { |
| 581 | /* I need need number of bytes not blocks. */ |
| 582 | table_start = table_en->start * DEV_BSIZE; |
| 583 | /* |
| 584 | * I have to sub 1 from table_en->length to prevent |
| 585 | * off by one error |
| 586 | */ |
| 587 | table_end = table_start + (table_en->length)* DEV_BSIZE; |
| 588 | |
| 589 | start = MAX(table_start, buf_start); |
| 590 | |
| 591 | end = MIN(table_end, buf_start + buf_len); |
| 592 | |
| 593 | aprint_debug("----------------------------------------\n" ); |
| 594 | aprint_debug("table_start %010" PRIu64", table_end %010" |
| 595 | PRIu64 "\n" , table_start, table_end); |
| 596 | aprint_debug("buf_start %010" PRIu64", buf_len %010" |
| 597 | PRIu64"\n" , buf_start, buf_len); |
| 598 | aprint_debug("start-buf_start %010" PRIu64", end %010" |
| 599 | PRIu64"\n" , start - buf_start, end); |
| 600 | aprint_debug("start %010" PRIu64" , end %010" |
| 601 | PRIu64"\n" , start, end); |
| 602 | aprint_debug("\n----------------------------------------\n" ); |
| 603 | |
| 604 | if (start < end) { |
| 605 | /* create nested buffer */ |
| 606 | nestbuf = getiobuf(NULL, true); |
| 607 | |
| 608 | nestiobuf_setup(bp, nestbuf, start - buf_start, |
| 609 | (end - start)); |
| 610 | |
| 611 | issued_len += end - start; |
| 612 | |
| 613 | /* I need number of blocks. */ |
| 614 | nestbuf->b_blkno = (start - table_start) / DEV_BSIZE; |
| 615 | |
| 616 | table_en->target->strategy(table_en, nestbuf); |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | if (issued_len < buf_len) |
| 621 | nestiobuf_done(bp, buf_len - issued_len, EINVAL); |
| 622 | |
| 623 | mutex_enter(&dmv->diskp_mtx); |
| 624 | disk_unbusy(dmv->diskp, buf_len, bp != NULL ? bp->b_flags & B_READ : 0); |
| 625 | mutex_exit(&dmv->diskp_mtx); |
| 626 | |
| 627 | dm_table_release(&dmv->table_head, DM_TABLE_ACTIVE); |
| 628 | dm_dev_unbusy(dmv); |
| 629 | |
| 630 | return; |
| 631 | } |
| 632 | |
| 633 | |
| 634 | static int |
| 635 | dmread(dev_t dev, struct uio *uio, int flag) |
| 636 | { |
| 637 | |
| 638 | return (physio(dmstrategy, NULL, dev, B_READ, dmminphys, uio)); |
| 639 | } |
| 640 | |
| 641 | static int |
| 642 | dmwrite(dev_t dev, struct uio *uio, int flag) |
| 643 | { |
| 644 | |
| 645 | return (physio(dmstrategy, NULL, dev, B_WRITE, dmminphys, uio)); |
| 646 | } |
| 647 | |
| 648 | static int |
| 649 | dmsize(dev_t dev) |
| 650 | { |
| 651 | dm_dev_t *dmv; |
| 652 | uint64_t size; |
| 653 | |
| 654 | size = 0; |
| 655 | |
| 656 | if ((dmv = dm_dev_lookup(NULL, NULL, minor(dev))) == NULL) |
| 657 | return -ENOENT; |
| 658 | |
| 659 | size = dm_table_size(&dmv->table_head); |
| 660 | dm_dev_unbusy(dmv); |
| 661 | |
| 662 | return size; |
| 663 | } |
| 664 | |
| 665 | static void |
| 666 | dmminphys(struct buf *bp) |
| 667 | { |
| 668 | |
| 669 | bp->b_bcount = MIN(bp->b_bcount, MAXPHYS); |
| 670 | } |
| 671 | |
| 672 | void |
| 673 | dmgetproperties(struct disk *disk, dm_table_head_t *head) |
| 674 | { |
| 675 | uint64_t numsec; |
| 676 | unsigned secsize; |
| 677 | |
| 678 | dm_table_disksize(head, &numsec, &secsize); |
| 679 | |
| 680 | struct disk_geom *dg = &disk->dk_geom; |
| 681 | |
| 682 | memset(dg, 0, sizeof(*dg)); |
| 683 | dg->dg_secperunit = numsec; |
| 684 | dg->dg_secsize = secsize; |
| 685 | dg->dg_nsectors = 32; |
| 686 | dg->dg_ntracks = 64; |
| 687 | |
| 688 | disk_set_info(NULL, disk, "ESDI" ); |
| 689 | } |
| 690 | |