1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 * Copyright 2013 Joyent, Inc. All rights reserved. 25 */ 26 27 /* vnode ops for the /dev/zvol directory */ 28 29 #include <sys/types.h> 30 #include <sys/param.h> 31 #include <sys/sysmacros.h> 32 #include <sys/ddi.h> 33 #include <sys/sunndi.h> 34 #include <sys/sunldi.h> 35 #include <fs/fs_subr.h> 36 #include <sys/fs/dv_node.h> 37 #include <sys/fs/sdev_impl.h> 38 #include <sys/zfs_ioctl.h> 39 #include <sys/policy.h> 40 #include <sys/stat.h> 41 #include <sys/vfs_opreg.h> 42 43 struct vnodeops *devzvol_vnodeops; 44 static uint64_t devzvol_gen = 0; 45 static uint64_t devzvol_zclist; 46 static size_t devzvol_zclist_size; 47 static ldi_ident_t devzvol_li; 48 static ldi_handle_t devzvol_lh; 49 static kmutex_t devzvol_mtx; 50 static boolean_t devzvol_isopen; 51 static major_t devzvol_major; 52 53 /* 54 * we need to use ddi_mod* since fs/dev gets loaded early on in 55 * startup(), and linking fs/dev to fs/zfs would drag in a lot of 56 * other stuff (like drv/random) before the rest of the system is 57 * ready to go 58 */ 59 ddi_modhandle_t zfs_mod; 60 int (*szcm)(char *); 61 int (*szn2m)(char *, minor_t *); 62 63 int 64 sdev_zvol_create_minor(char *dsname) 65 { 66 if (szcm == NULL) 67 return (-1); 68 return ((*szcm)(dsname)); 69 } 70 71 int 72 sdev_zvol_name2minor(char *dsname, minor_t *minor) 73 { 74 if (szn2m == NULL) 75 return (-1); 76 return ((*szn2m)(dsname, minor)); 77 } 78 79 int 80 devzvol_open_zfs() 81 { 82 int rc; 83 dev_t dv; 84 85 devzvol_li = ldi_ident_from_anon(); 86 if (ldi_open_by_name("/dev/zfs", FREAD | FWRITE, kcred, 87 &devzvol_lh, devzvol_li)) 88 return (-1); 89 if (zfs_mod == NULL && ((zfs_mod = ddi_modopen("fs/zfs", 90 KRTLD_MODE_FIRST, &rc)) == NULL)) { 91 return (rc); 92 } 93 ASSERT(szcm == NULL && szn2m == NULL); 94 if ((szcm = (int (*)(char *)) 95 ddi_modsym(zfs_mod, "zvol_create_minor", &rc)) == NULL) { 96 cmn_err(CE_WARN, "couldn't resolve zvol_create_minor"); 97 return (rc); 98 } 99 if ((szn2m = (int(*)(char *, minor_t *)) 100 ddi_modsym(zfs_mod, "zvol_name2minor", &rc)) == NULL) { 101 cmn_err(CE_WARN, "couldn't resolve zvol_name2minor"); 102 return (rc); 103 } 104 if (ldi_get_dev(devzvol_lh, &dv)) 105 return (-1); 106 devzvol_major = getmajor(dv); 107 return (0); 108 } 109 110 void 111 devzvol_close_zfs() 112 { 113 szcm = NULL; 114 szn2m = NULL; 115 (void) ldi_close(devzvol_lh, FREAD|FWRITE, kcred); 116 ldi_ident_release(devzvol_li); 117 if (zfs_mod != NULL) { 118 (void) ddi_modclose(zfs_mod); 119 zfs_mod = NULL; 120 } 121 } 122 123 int 124 devzvol_handle_ioctl(int cmd, zfs_cmd_t *zc, size_t *alloc_size) 125 { 126 uint64_t cookie; 127 int size = 8000; 128 int unused; 129 int rc; 130 131 if (cmd != ZFS_IOC_POOL_CONFIGS) 132 mutex_enter(&devzvol_mtx); 133 if (!devzvol_isopen) { 134 if ((rc = devzvol_open_zfs()) == 0) { 135 devzvol_isopen = B_TRUE; 136 } else { 137 if (cmd != ZFS_IOC_POOL_CONFIGS) 138 mutex_exit(&devzvol_mtx); 139 return (ENXIO); 140 } 141 } 142 cookie = zc->zc_cookie; 143 again: 144 zc->zc_nvlist_dst = (uint64_t)(intptr_t)kmem_alloc(size, 145 KM_SLEEP); 146 zc->zc_nvlist_dst_size = size; 147 rc = ldi_ioctl(devzvol_lh, cmd, (intptr_t)zc, FKIOCTL, kcred, 148 &unused); 149 if (rc == ENOMEM) { 150 int newsize; 151 newsize = zc->zc_nvlist_dst_size; 152 ASSERT(newsize > size); 153 kmem_free((void *)(uintptr_t)zc->zc_nvlist_dst, size); 154 size = newsize; 155 zc->zc_cookie = cookie; 156 goto again; 157 } 158 if (alloc_size == NULL) 159 kmem_free((void *)(uintptr_t)zc->zc_nvlist_dst, size); 160 else 161 *alloc_size = size; 162 if (cmd != ZFS_IOC_POOL_CONFIGS) 163 mutex_exit(&devzvol_mtx); 164 return (rc); 165 } 166 167 /* figures out if the objset exists and returns its type */ 168 int 169 devzvol_objset_check(char *dsname, dmu_objset_type_t *type) 170 { 171 boolean_t ispool; 172 zfs_cmd_t *zc; 173 int rc; 174 175 zc = kmem_zalloc(sizeof (zfs_cmd_t), KM_SLEEP); 176 (void) strlcpy(zc->zc_name, dsname, MAXPATHLEN); 177 178 ispool = (strchr(dsname, '/') == NULL) ? B_TRUE : B_FALSE; 179 if (!ispool && sdev_zvol_name2minor(dsname, NULL) == 0) { 180 sdcmn_err13(("found cached minor node")); 181 if (type) 182 *type = DMU_OST_ZVOL; 183 kmem_free(zc, sizeof (zfs_cmd_t)); 184 return (0); 185 } 186 rc = devzvol_handle_ioctl(ispool ? ZFS_IOC_POOL_STATS : 187 ZFS_IOC_OBJSET_STATS, zc, NULL); 188 if (type && rc == 0) 189 *type = (ispool) ? DMU_OST_ZFS : 190 zc->zc_objset_stats.dds_type; 191 kmem_free(zc, sizeof (zfs_cmd_t)); 192 return (rc); 193 } 194 195 /* 196 * returns what the zfs dataset name should be, given the /dev/zvol 197 * path and an optional name; otherwise NULL 198 */ 199 char * 200 devzvol_make_dsname(const char *path, const char *name) 201 { 202 char *dsname; 203 const char *ptr; 204 int dslen; 205 206 if (strcmp(path, ZVOL_DIR) == 0) 207 return (NULL); 208 if (name && (strcmp(name, ".") == 0 || strcmp(name, "..") == 0)) 209 return (NULL); 210 ptr = path + strlen(ZVOL_DIR); 211 if (strncmp(ptr, "/dsk", 4) == 0) 212 ptr += strlen("/dsk"); 213 else if (strncmp(ptr, "/rdsk", 5) == 0) 214 ptr += strlen("/rdsk"); 215 else 216 return (NULL); 217 if (*ptr == '/') 218 ptr++; 219 220 dslen = strlen(ptr); 221 if (dslen) 222 dslen++; /* plus null */ 223 if (name) 224 dslen += strlen(name) + 1; /* plus slash */ 225 dsname = kmem_zalloc(dslen, KM_SLEEP); 226 if (*ptr) { 227 (void) strlcpy(dsname, ptr, dslen); 228 if (name) 229 (void) strlcat(dsname, "/", dslen); 230 } 231 if (name) 232 (void) strlcat(dsname, name, dslen); 233 return (dsname); 234 } 235 236 /* 237 * check if the zvol's sdev_node is still valid, which means make 238 * sure the zvol is still valid. zvol minors aren't proactively 239 * destroyed when the zvol is destroyed, so we use a validator to clean 240 * these up (in other words, when such nodes are encountered during 241 * subsequent lookup() and readdir() operations) so that only valid 242 * nodes are returned. The ordering between devname_lookup_func and 243 * devzvol_validate is a little inefficient in the case of invalid 244 * or stale nodes because devname_lookup_func calls 245 * devzvol_create_{dir, link}, then the validator says it's invalid, 246 * and then the node gets cleaned up. 247 */ 248 int 249 devzvol_validate(struct sdev_node *dv) 250 { 251 dmu_objset_type_t do_type; 252 char *dsname; 253 char *nm = dv->sdev_name; 254 int rc; 255 256 sdcmn_err13(("validating ('%s' '%s')", dv->sdev_path, nm)); 257 /* 258 * validate only READY nodes; if someone is sitting on the 259 * directory of a dataset that just got destroyed we could 260 * get a zombie node which we just skip. 261 */ 262 if (dv->sdev_state != SDEV_READY) { 263 sdcmn_err13(("skipping '%s'", nm)); 264 return (SDEV_VTOR_SKIP); 265 } 266 267 if ((strcmp(dv->sdev_path, ZVOL_DIR "/dsk") == 0) || 268 (strcmp(dv->sdev_path, ZVOL_DIR "/rdsk") == 0)) 269 return (SDEV_VTOR_VALID); 270 dsname = devzvol_make_dsname(dv->sdev_path, NULL); 271 if (dsname == NULL) 272 return (SDEV_VTOR_INVALID); 273 274 rc = devzvol_objset_check(dsname, &do_type); 275 sdcmn_err13((" '%s' rc %d", dsname, rc)); 276 if (rc != 0) { 277 kmem_free(dsname, strlen(dsname) + 1); 278 return (SDEV_VTOR_INVALID); 279 } 280 sdcmn_err13((" v_type %d do_type %d", 281 SDEVTOV(dv)->v_type, do_type)); 282 if ((SDEVTOV(dv)->v_type == VLNK && do_type != DMU_OST_ZVOL) || 283 ((SDEVTOV(dv)->v_type == VBLK || SDEVTOV(dv)->v_type == VCHR) && 284 do_type != DMU_OST_ZVOL) || 285 (SDEVTOV(dv)->v_type == VDIR && do_type == DMU_OST_ZVOL)) { 286 kmem_free(dsname, strlen(dsname) + 1); 287 return (SDEV_VTOR_STALE); 288 } 289 if (SDEVTOV(dv)->v_type == VLNK) { 290 char *ptr, *link; 291 long val = 0; 292 minor_t lminor, ominor; 293 294 rc = sdev_getlink(SDEVTOV(dv), &link); 295 ASSERT(rc == 0); 296 297 ptr = strrchr(link, ':') + 1; 298 rc = ddi_strtol(ptr, NULL, 10, &val); 299 kmem_free(link, strlen(link) + 1); 300 ASSERT(rc == 0 && val != 0); 301 lminor = (minor_t)val; 302 if (sdev_zvol_name2minor(dsname, &ominor) < 0 || 303 ominor != lminor) { 304 kmem_free(dsname, strlen(dsname) + 1); 305 return (SDEV_VTOR_STALE); 306 } 307 } 308 kmem_free(dsname, strlen(dsname) + 1); 309 return (SDEV_VTOR_VALID); 310 } 311 312 /* 313 * creates directories as needed in response to a readdir 314 */ 315 void 316 devzvol_create_pool_dirs(struct vnode *dvp) 317 { 318 zfs_cmd_t *zc; 319 nvlist_t *nv = NULL; 320 nvpair_t *elem = NULL; 321 size_t size; 322 int pools = 0; 323 int rc; 324 325 sdcmn_err13(("devzvol_create_pool_dirs")); 326 zc = kmem_zalloc(sizeof (zfs_cmd_t), KM_SLEEP); 327 mutex_enter(&devzvol_mtx); 328 zc->zc_cookie = devzvol_gen; 329 330 rc = devzvol_handle_ioctl(ZFS_IOC_POOL_CONFIGS, zc, &size); 331 switch (rc) { 332 case 0: 333 /* new generation */ 334 ASSERT(devzvol_gen != zc->zc_cookie); 335 devzvol_gen = zc->zc_cookie; 336 if (devzvol_zclist) 337 kmem_free((void *)(uintptr_t)devzvol_zclist, 338 devzvol_zclist_size); 339 devzvol_zclist = zc->zc_nvlist_dst; 340 devzvol_zclist_size = size; 341 break; 342 case EEXIST: 343 /* 344 * no change in the configuration; still need 345 * to do lookups in case we did a lookup in 346 * zvol/rdsk but not zvol/dsk (or vice versa) 347 */ 348 kmem_free((void *)(uintptr_t)zc->zc_nvlist_dst, 349 size); 350 break; 351 default: 352 kmem_free((void *)(uintptr_t)zc->zc_nvlist_dst, 353 size); 354 goto out; 355 } 356 rc = nvlist_unpack((char *)(uintptr_t)devzvol_zclist, 357 devzvol_zclist_size, &nv, 0); 358 if (rc) { 359 ASSERT(rc == 0); 360 kmem_free((void *)(uintptr_t)devzvol_zclist, 361 devzvol_zclist_size); 362 devzvol_gen = 0; 363 devzvol_zclist = NULL; 364 devzvol_zclist_size = 0; 365 goto out; 366 } 367 mutex_exit(&devzvol_mtx); 368 while ((elem = nvlist_next_nvpair(nv, elem)) != NULL) { 369 struct vnode *vp; 370 ASSERT(dvp->v_count > 0); 371 rc = VOP_LOOKUP(dvp, nvpair_name(elem), &vp, NULL, 0, 372 NULL, kcred, NULL, 0, NULL); 373 /* should either work, or not be visible from a zone */ 374 ASSERT(rc == 0 || rc == ENOENT); 375 if (rc == 0) 376 VN_RELE(vp); 377 pools++; 378 } 379 nvlist_free(nv); 380 mutex_enter(&devzvol_mtx); 381 if (devzvol_isopen && pools == 0) { 382 /* clean up so zfs can be unloaded */ 383 devzvol_close_zfs(); 384 devzvol_isopen = B_FALSE; 385 } 386 out: 387 mutex_exit(&devzvol_mtx); 388 kmem_free(zc, sizeof (zfs_cmd_t)); 389 } 390 391 /*ARGSUSED3*/ 392 static int 393 devzvol_create_dir(struct sdev_node *ddv, char *nm, void **arg, 394 cred_t *cred, void *whatever, char *whichever) 395 { 396 timestruc_t now; 397 struct vattr *vap = (struct vattr *)arg; 398 399 sdcmn_err13(("create_dir (%s) (%s) '%s'", ddv->sdev_name, 400 ddv->sdev_path, nm)); 401 ASSERT(strncmp(ddv->sdev_path, ZVOL_DIR, 402 strlen(ZVOL_DIR)) == 0); 403 *vap = *sdev_getdefault_attr(VDIR); 404 gethrestime(&now); 405 vap->va_atime = now; 406 vap->va_mtime = now; 407 vap->va_ctime = now; 408 return (0); 409 } 410 411 /*ARGSUSED3*/ 412 static int 413 devzvol_create_link(struct sdev_node *ddv, char *nm, 414 void **arg, cred_t *cred, void *whatever, char *whichever) 415 { 416 minor_t minor; 417 char *pathname = (char *)*arg; 418 int rc; 419 char *dsname; 420 char *x; 421 char str[MAXNAMELEN]; 422 sdcmn_err13(("create_link (%s) (%s) '%s'", ddv->sdev_name, 423 ddv->sdev_path, nm)); 424 dsname = devzvol_make_dsname(ddv->sdev_path, nm); 425 rc = sdev_zvol_create_minor(dsname); 426 if ((rc != 0 && rc != EEXIST && rc != EBUSY) || 427 sdev_zvol_name2minor(dsname, &minor)) { 428 sdcmn_err13(("devzvol_create_link %d", rc)); 429 kmem_free(dsname, strlen(dsname) + 1); 430 return (-1); 431 } 432 kmem_free(dsname, strlen(dsname) + 1); 433 434 /* 435 * This is a valid zvol; create a symlink that points to the 436 * minor which was created under /devices/pseudo/zfs@0 437 */ 438 *pathname = '\0'; 439 for (x = ddv->sdev_path; x = strchr(x, '/'); x++) 440 (void) strcat(pathname, "../"); 441 (void) snprintf(str, sizeof (str), ZVOL_PSEUDO_DEV "%u", minor); 442 (void) strncat(pathname, str, MAXPATHLEN); 443 if (strncmp(ddv->sdev_path, ZVOL_FULL_RDEV_DIR, 444 strlen(ZVOL_FULL_RDEV_DIR)) == 0) 445 (void) strcat(pathname, ",raw"); 446 return (0); 447 } 448 449 /* Clean zvol sdev_nodes that are no longer valid. */ 450 static void 451 devzvol_prunedir(struct sdev_node *ddv) 452 { 453 struct sdev_node *dv; 454 455 ASSERT(RW_READ_HELD(&ddv->sdev_contents)); 456 457 sdcmn_err13(("prunedir '%s'", ddv->sdev_name)); 458 ASSERT(strncmp(ddv->sdev_path, ZVOL_DIR, strlen(ZVOL_DIR)) == 0); 459 if (rw_tryupgrade(&ddv->sdev_contents) == 0) { 460 rw_exit(&ddv->sdev_contents); 461 rw_enter(&ddv->sdev_contents, RW_WRITER); 462 } 463 464 dv = SDEV_FIRST_ENTRY(ddv); 465 while (dv) { 466 sdcmn_err13(("sdev_name '%s'", dv->sdev_name)); 467 468 switch (devzvol_validate(dv)) { 469 case SDEV_VTOR_VALID: 470 case SDEV_VTOR_SKIP: 471 dv = SDEV_NEXT_ENTRY(ddv, dv); 472 continue; 473 case SDEV_VTOR_INVALID: 474 sdcmn_err7(("prunedir: destroy invalid " 475 "node: %s\n", dv->sdev_name)); 476 break; 477 } 478 479 if ((SDEVTOV(dv)->v_type == VDIR) && 480 (sdev_cleandir(dv, NULL, 0) != 0)) { 481 dv = SDEV_NEXT_ENTRY(ddv, dv); 482 continue; 483 } 484 SDEV_HOLD(dv); 485 /* remove the cache node */ 486 sdev_cache_update(ddv, &dv, dv->sdev_name, 487 SDEV_CACHE_DELETE); 488 SDEV_RELE(dv); 489 dv = SDEV_FIRST_ENTRY(ddv); 490 } 491 rw_downgrade(&ddv->sdev_contents); 492 } 493 494 /* 495 * This function is used to create a dir or dev inside a zone's /dev when the 496 * zone has a zvol that is dynamically created within the zone (i.e. inside 497 * of a delegated dataset. Since there is no /devices tree within a zone, 498 * we create the chr/blk devices directly inside the zone's /dev instead of 499 * making symlinks. 500 */ 501 static int 502 devzvol_mk_ngz_node(struct sdev_node *parent, char *nm) 503 { 504 struct vattr vattr; 505 timestruc_t now; 506 enum vtype expected_type = VDIR; 507 dmu_objset_type_t do_type; 508 struct sdev_node *dv = NULL; 509 int res; 510 char *dsname; 511 512 bzero(&vattr, sizeof (vattr)); 513 gethrestime(&now); 514 vattr.va_mask = AT_TYPE|AT_MODE|AT_UID|AT_GID; 515 vattr.va_uid = SDEV_UID_DEFAULT; 516 vattr.va_gid = SDEV_GID_DEFAULT; 517 vattr.va_type = VNON; 518 vattr.va_atime = now; 519 vattr.va_mtime = now; 520 vattr.va_ctime = now; 521 522 if ((dsname = devzvol_make_dsname(parent->sdev_path, nm)) == NULL) 523 return (ENOENT); 524 525 if (devzvol_objset_check(dsname, &do_type) != 0) { 526 kmem_free(dsname, strlen(dsname) + 1); 527 return (ENOENT); 528 } 529 if (do_type == DMU_OST_ZVOL) 530 expected_type = VBLK; 531 532 if (expected_type == VDIR) { 533 vattr.va_type = VDIR; 534 vattr.va_mode = SDEV_DIRMODE_DEFAULT; 535 } else { 536 minor_t minor; 537 dev_t devnum; 538 int rc; 539 540 rc = sdev_zvol_create_minor(dsname); 541 if ((rc != 0 && rc != EEXIST && rc != EBUSY) || 542 sdev_zvol_name2minor(dsname, &minor)) { 543 kmem_free(dsname, strlen(dsname) + 1); 544 return (ENOENT); 545 } 546 547 devnum = makedevice(devzvol_major, minor); 548 vattr.va_rdev = devnum; 549 550 if (strstr(parent->sdev_path, "/rdsk/") != NULL) 551 vattr.va_type = VCHR; 552 else 553 vattr.va_type = VBLK; 554 vattr.va_mode = SDEV_DEVMODE_DEFAULT; 555 } 556 kmem_free(dsname, strlen(dsname) + 1); 557 558 rw_enter(&parent->sdev_contents, RW_WRITER); 559 560 res = sdev_mknode(parent, nm, &dv, &vattr, 561 NULL, NULL, kcred, SDEV_READY); 562 rw_exit(&parent->sdev_contents); 563 if (res != 0) 564 return (ENOENT); 565 566 SDEV_RELE(dv); 567 return (0); 568 } 569 570 /*ARGSUSED*/ 571 static int 572 devzvol_lookup(struct vnode *dvp, char *nm, struct vnode **vpp, 573 struct pathname *pnp, int flags, struct vnode *rdir, struct cred *cred, 574 caller_context_t *ct, int *direntflags, pathname_t *realpnp) 575 { 576 enum vtype expected_type = VDIR; 577 struct sdev_node *parent = VTOSDEV(dvp); 578 char *dsname; 579 dmu_objset_type_t do_type; 580 int error; 581 582 sdcmn_err13(("devzvol_lookup '%s' '%s'", parent->sdev_path, nm)); 583 *vpp = NULL; 584 /* execute access is required to search the directory */ 585 if ((error = VOP_ACCESS(dvp, VEXEC, 0, cred, ct)) != 0) 586 return (error); 587 588 rw_enter(&parent->sdev_contents, RW_READER); 589 if (SDEV_IS_GLOBAL(parent)) { 590 /* 591 * During iter_datasets, don't create GZ dev when running in 592 * NGZ. We can't return ENOENT here since that could 593 * incorrectly trigger the creation of the dev from the 594 * recursive call through prof_filldir during iter_datasets. 595 */ 596 if (getzoneid() != GLOBAL_ZONEID) { 597 rw_exit(&parent->sdev_contents); 598 return (EPERM); 599 } 600 } else { 601 int res; 602 603 rw_exit(&parent->sdev_contents); 604 605 /* 606 * If we're in the global zone and reach down into a non-global 607 * zone's /dev/zvol then this action could trigger the creation 608 * of all of the zvol devices for every zone into the non-global 609 * zone's /dev tree. This could be a big security hole. To 610 * prevent this, disallow the global zone from looking inside 611 * a non-global zones /dev/zvol. This behavior is similar to 612 * delegated datasets, which cannot be used by the global zone. 613 */ 614 if (getzoneid() == GLOBAL_ZONEID) 615 return (EPERM); 616 617 res = prof_lookup(dvp, nm, vpp, cred); 618 619 /* 620 * We won't find a zvol that was dynamically created inside 621 * a NGZ, within a delegated dataset, in the zone's dev profile 622 * but prof_lookup will also find it via sdev_cache_lookup. 623 */ 624 if (res == ENOENT) { 625 /* 626 * We have to create the sdev node for the dymamically 627 * created zvol. 628 */ 629 if (devzvol_mk_ngz_node(parent, nm) != 0) 630 return (ENOENT); 631 res = prof_lookup(dvp, nm, vpp, cred); 632 } 633 634 return (res); 635 } 636 637 dsname = devzvol_make_dsname(parent->sdev_path, nm); 638 rw_exit(&parent->sdev_contents); 639 sdcmn_err13(("rvp dsname %s", dsname ? dsname : "(null)")); 640 if (dsname) { 641 error = devzvol_objset_check(dsname, &do_type); 642 if (error != 0) { 643 error = ENOENT; 644 goto out; 645 } 646 if (do_type == DMU_OST_ZVOL) 647 expected_type = VLNK; 648 } 649 /* 650 * the callbacks expect: 651 * 652 * parent->sdev_path nm 653 * /dev/zvol {r}dsk 654 * /dev/zvol/{r}dsk <pool name> 655 * /dev/zvol/{r}dsk/<dataset name> <last ds component> 656 * 657 * sdev_name is always last path component of sdev_path 658 */ 659 if (expected_type == VDIR) { 660 error = devname_lookup_func(parent, nm, vpp, cred, 661 devzvol_create_dir, SDEV_VATTR); 662 } else { 663 error = devname_lookup_func(parent, nm, vpp, cred, 664 devzvol_create_link, SDEV_VLINK); 665 } 666 sdcmn_err13(("devzvol_lookup %d %d", expected_type, error)); 667 ASSERT(error || ((*vpp)->v_type == expected_type)); 668 out: 669 if (dsname) 670 kmem_free(dsname, strlen(dsname) + 1); 671 sdcmn_err13(("devzvol_lookup %d", error)); 672 return (error); 673 } 674 675 /* 676 * We allow create to find existing nodes 677 * - if the node doesn't exist - EROFS 678 * - creating an existing dir read-only succeeds, otherwise EISDIR 679 * - exclusive creates fail - EEXIST 680 */ 681 /*ARGSUSED2*/ 682 static int 683 devzvol_create(struct vnode *dvp, char *nm, struct vattr *vap, vcexcl_t excl, 684 int mode, struct vnode **vpp, struct cred *cred, int flag, 685 caller_context_t *ct, vsecattr_t *vsecp) 686 { 687 int error; 688 struct vnode *vp; 689 690 *vpp = NULL; 691 692 error = devzvol_lookup(dvp, nm, &vp, NULL, 0, NULL, cred, ct, NULL, 693 NULL); 694 if (error == 0) { 695 if (excl == EXCL) 696 error = EEXIST; 697 else if (vp->v_type == VDIR && (mode & VWRITE)) 698 error = EISDIR; 699 else 700 error = VOP_ACCESS(vp, mode, 0, cred, ct); 701 702 if (error) { 703 VN_RELE(vp); 704 } else 705 *vpp = vp; 706 } else if (error == ENOENT) { 707 error = EROFS; 708 } 709 710 return (error); 711 } 712 713 void sdev_iter_snapshots(struct vnode *dvp, char *name); 714 715 void 716 sdev_iter_datasets(struct vnode *dvp, int arg, char *name) 717 { 718 zfs_cmd_t *zc; 719 int rc; 720 721 sdcmn_err13(("iter name is '%s' (arg %x)", name, arg)); 722 zc = kmem_zalloc(sizeof (zfs_cmd_t), KM_SLEEP); 723 (void) strcpy(zc->zc_name, name); 724 725 while ((rc = devzvol_handle_ioctl(arg, zc, B_FALSE)) == 0) { 726 struct vnode *vpp; 727 char *ptr; 728 729 sdcmn_err13((" name %s", zc->zc_name)); 730 if (strchr(zc->zc_name, '$') || strchr(zc->zc_name, '%')) 731 goto skip; 732 ptr = strrchr(zc->zc_name, '/') + 1; 733 rc = devzvol_lookup(dvp, ptr, &vpp, NULL, 0, NULL, 734 kcred, NULL, NULL, NULL); 735 if (rc == 0) { 736 VN_RELE(vpp); 737 } else if (rc == ENOENT) { 738 goto skip; 739 } else { 740 /* 741 * EBUSY == problem with zvols's dmu holds? 742 * EPERM when in a NGZ and traversing up and out. 743 */ 744 goto skip; 745 } 746 if (arg == ZFS_IOC_DATASET_LIST_NEXT && 747 zc->zc_objset_stats.dds_type != DMU_OST_ZFS) 748 sdev_iter_snapshots(dvp, zc->zc_name); 749 skip: 750 (void) strcpy(zc->zc_name, name); 751 } 752 kmem_free(zc, sizeof (zfs_cmd_t)); 753 } 754 755 void 756 sdev_iter_snapshots(struct vnode *dvp, char *name) 757 { 758 sdev_iter_datasets(dvp, ZFS_IOC_SNAPSHOT_LIST_NEXT, name); 759 } 760 761 /*ARGSUSED4*/ 762 static int 763 devzvol_readdir(struct vnode *dvp, struct uio *uiop, struct cred *cred, 764 int *eofp, caller_context_t *ct_unused, int flags_unused) 765 { 766 struct sdev_node *sdvp = VTOSDEV(dvp); 767 char *ptr; 768 769 sdcmn_err13(("zv readdir of '%s' %s'", sdvp->sdev_path, 770 sdvp->sdev_name)); 771 772 if (strcmp(sdvp->sdev_path, ZVOL_DIR) == 0) { 773 struct vnode *vp; 774 775 rw_exit(&sdvp->sdev_contents); 776 (void) devname_lookup_func(sdvp, "dsk", &vp, cred, 777 devzvol_create_dir, SDEV_VATTR); 778 VN_RELE(vp); 779 (void) devname_lookup_func(sdvp, "rdsk", &vp, cred, 780 devzvol_create_dir, SDEV_VATTR); 781 VN_RELE(vp); 782 rw_enter(&sdvp->sdev_contents, RW_READER); 783 return (devname_readdir_func(dvp, uiop, cred, eofp, 0)); 784 } 785 if (uiop->uio_offset == 0) 786 devzvol_prunedir(sdvp); 787 ptr = sdvp->sdev_path + strlen(ZVOL_DIR); 788 if ((strcmp(ptr, "/dsk") == 0) || (strcmp(ptr, "/rdsk") == 0)) { 789 rw_exit(&sdvp->sdev_contents); 790 devzvol_create_pool_dirs(dvp); 791 rw_enter(&sdvp->sdev_contents, RW_READER); 792 return (devname_readdir_func(dvp, uiop, cred, eofp, 0)); 793 } 794 795 ptr = strchr(ptr + 1, '/'); 796 if (ptr == NULL) 797 return (ENOENT); 798 ptr++; 799 rw_exit(&sdvp->sdev_contents); 800 sdev_iter_datasets(dvp, ZFS_IOC_DATASET_LIST_NEXT, ptr); 801 rw_enter(&sdvp->sdev_contents, RW_READER); 802 return (devname_readdir_func(dvp, uiop, cred, eofp, 0)); 803 } 804 805 const fs_operation_def_t devzvol_vnodeops_tbl[] = { 806 VOPNAME_READDIR, { .vop_readdir = devzvol_readdir }, 807 VOPNAME_LOOKUP, { .vop_lookup = devzvol_lookup }, 808 VOPNAME_CREATE, { .vop_create = devzvol_create }, 809 VOPNAME_RENAME, { .error = fs_nosys }, 810 VOPNAME_MKDIR, { .error = fs_nosys }, 811 VOPNAME_RMDIR, { .error = fs_nosys }, 812 VOPNAME_REMOVE, { .error = fs_nosys }, 813 VOPNAME_SYMLINK, { .error = fs_nosys }, 814 NULL, NULL 815 }; 816