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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * utility routines for the /dev fs 30 */ 31 32 #include <sys/types.h> 33 #include <sys/param.h> 34 #include <sys/t_lock.h> 35 #include <sys/systm.h> 36 #include <sys/sysmacros.h> 37 #include <sys/user.h> 38 #include <sys/time.h> 39 #include <sys/vfs.h> 40 #include <sys/vnode.h> 41 #include <sys/file.h> 42 #include <sys/fcntl.h> 43 #include <sys/flock.h> 44 #include <sys/kmem.h> 45 #include <sys/uio.h> 46 #include <sys/errno.h> 47 #include <sys/stat.h> 48 #include <sys/cred.h> 49 #include <sys/dirent.h> 50 #include <sys/pathname.h> 51 #include <sys/cmn_err.h> 52 #include <sys/debug.h> 53 #include <sys/mode.h> 54 #include <sys/policy.h> 55 #include <fs/fs_subr.h> 56 #include <sys/mount.h> 57 #include <sys/fs/snode.h> 58 #include <sys/fs/dv_node.h> 59 #include <sys/fs/sdev_impl.h> 60 #include <sys/fs/sdev_node.h> 61 #include <sys/sunndi.h> 62 #include <sys/sunmdi.h> 63 #include <sys/conf.h> 64 #include <sys/proc.h> 65 #include <sys/user.h> 66 #include <sys/modctl.h> 67 68 #ifdef DEBUG 69 int sdev_debug = 0x00000001; 70 int sdev_debug_cache_flags = 0; 71 #endif 72 73 /* 74 * globals 75 */ 76 /* prototype memory vattrs */ 77 vattr_t sdev_vattr_dir = { 78 AT_TYPE|AT_MODE|AT_UID|AT_GID, /* va_mask */ 79 VDIR, /* va_type */ 80 SDEV_DIRMODE_DEFAULT, /* va_mode */ 81 SDEV_UID_DEFAULT, /* va_uid */ 82 SDEV_GID_DEFAULT, /* va_gid */ 83 0, /* va_fsid */ 84 0, /* va_nodeid */ 85 0, /* va_nlink */ 86 0, /* va_size */ 87 0, /* va_atime */ 88 0, /* va_mtime */ 89 0, /* va_ctime */ 90 0, /* va_rdev */ 91 0, /* va_blksize */ 92 0, /* va_nblocks */ 93 0 /* va_vcode */ 94 }; 95 96 vattr_t sdev_vattr_lnk = { 97 AT_TYPE|AT_MODE, /* va_mask */ 98 VLNK, /* va_type */ 99 SDEV_LNKMODE_DEFAULT, /* va_mode */ 100 SDEV_UID_DEFAULT, /* va_uid */ 101 SDEV_GID_DEFAULT, /* va_gid */ 102 0, /* va_fsid */ 103 0, /* va_nodeid */ 104 0, /* va_nlink */ 105 0, /* va_size */ 106 0, /* va_atime */ 107 0, /* va_mtime */ 108 0, /* va_ctime */ 109 0, /* va_rdev */ 110 0, /* va_blksize */ 111 0, /* va_nblocks */ 112 0 /* va_vcode */ 113 }; 114 115 vattr_t sdev_vattr_blk = { 116 AT_TYPE|AT_MODE|AT_UID|AT_GID, /* va_mask */ 117 VBLK, /* va_type */ 118 S_IFBLK | SDEV_DEVMODE_DEFAULT, /* va_mode */ 119 SDEV_UID_DEFAULT, /* va_uid */ 120 SDEV_GID_DEFAULT, /* va_gid */ 121 0, /* va_fsid */ 122 0, /* va_nodeid */ 123 0, /* va_nlink */ 124 0, /* va_size */ 125 0, /* va_atime */ 126 0, /* va_mtime */ 127 0, /* va_ctime */ 128 0, /* va_rdev */ 129 0, /* va_blksize */ 130 0, /* va_nblocks */ 131 0 /* va_vcode */ 132 }; 133 134 vattr_t sdev_vattr_chr = { 135 AT_TYPE|AT_MODE|AT_UID|AT_GID, /* va_mask */ 136 VCHR, /* va_type */ 137 S_IFCHR | SDEV_DEVMODE_DEFAULT, /* va_mode */ 138 SDEV_UID_DEFAULT, /* va_uid */ 139 SDEV_GID_DEFAULT, /* va_gid */ 140 0, /* va_fsid */ 141 0, /* va_nodeid */ 142 0, /* va_nlink */ 143 0, /* va_size */ 144 0, /* va_atime */ 145 0, /* va_mtime */ 146 0, /* va_ctime */ 147 0, /* va_rdev */ 148 0, /* va_blksize */ 149 0, /* va_nblocks */ 150 0 /* va_vcode */ 151 }; 152 153 kmem_cache_t *sdev_node_cache; /* sdev_node cache */ 154 int devtype; /* fstype */ 155 156 struct devname_ops *devname_ns_ops; /* default name service directory ops */ 157 kmutex_t devname_nsmaps_lock; /* protect devname_nsmaps */ 158 159 /* static */ 160 static struct devname_nsmap *devname_nsmaps = NULL; 161 /* contents from /etc/dev/devname_master */ 162 static int devname_nsmaps_invalidated = 0; /* "devfsadm -m" has run */ 163 164 static struct vnodeops *sdev_get_vop(struct sdev_node *); 165 static void sdev_set_no_nocache(struct sdev_node *); 166 static int sdev_get_moduleops(struct sdev_node *); 167 static fs_operation_def_t *sdev_merge_vtab(const fs_operation_def_t []); 168 static void sdev_free_vtab(fs_operation_def_t *); 169 170 static void 171 sdev_prof_free(struct sdev_node *dv) 172 { 173 ASSERT(!SDEV_IS_GLOBAL(dv)); 174 if (dv->sdev_prof.dev_name) 175 nvlist_free(dv->sdev_prof.dev_name); 176 if (dv->sdev_prof.dev_map) 177 nvlist_free(dv->sdev_prof.dev_map); 178 if (dv->sdev_prof.dev_symlink) 179 nvlist_free(dv->sdev_prof.dev_symlink); 180 if (dv->sdev_prof.dev_glob_incdir) 181 nvlist_free(dv->sdev_prof.dev_glob_incdir); 182 if (dv->sdev_prof.dev_glob_excdir) 183 nvlist_free(dv->sdev_prof.dev_glob_excdir); 184 bzero(&dv->sdev_prof, sizeof (dv->sdev_prof)); 185 } 186 187 /* 188 * sdev_node cache constructor 189 */ 190 /*ARGSUSED1*/ 191 static int 192 i_sdev_node_ctor(void *buf, void *cfarg, int flag) 193 { 194 struct sdev_node *dv = (struct sdev_node *)buf; 195 struct vnode *vp; 196 197 ASSERT(flag == KM_SLEEP); 198 199 bzero(buf, sizeof (struct sdev_node)); 200 rw_init(&dv->sdev_contents, NULL, RW_DEFAULT, NULL); 201 dv->sdev_vnode = vn_alloc(KM_SLEEP); 202 vp = SDEVTOV(dv); 203 vp->v_data = (caddr_t)dv; 204 return (0); 205 } 206 207 /* sdev_node destructor for kmem cache */ 208 /*ARGSUSED1*/ 209 static void 210 i_sdev_node_dtor(void *buf, void *arg) 211 { 212 struct sdev_node *dv = (struct sdev_node *)buf; 213 struct vnode *vp = SDEVTOV(dv); 214 215 rw_destroy(&dv->sdev_contents); 216 vn_free(vp); 217 } 218 219 /* initialize sdev_node cache */ 220 void 221 sdev_node_cache_init() 222 { 223 int flags = 0; 224 225 #ifdef DEBUG 226 flags = sdev_debug_cache_flags; 227 if (flags) 228 sdcmn_err(("cache debug flags 0x%x\n", flags)); 229 #endif /* DEBUG */ 230 231 ASSERT(sdev_node_cache == NULL); 232 sdev_node_cache = kmem_cache_create("sdev_node_cache", 233 sizeof (struct sdev_node), 0, i_sdev_node_ctor, i_sdev_node_dtor, 234 NULL, NULL, NULL, flags); 235 } 236 237 /* destroy sdev_node cache */ 238 void 239 sdev_node_cache_fini() 240 { 241 ASSERT(sdev_node_cache != NULL); 242 kmem_cache_destroy(sdev_node_cache); 243 sdev_node_cache = NULL; 244 } 245 246 void 247 sdev_set_nodestate(struct sdev_node *dv, sdev_node_state_t state) 248 { 249 ASSERT(dv); 250 ASSERT(RW_WRITE_HELD(&dv->sdev_contents)); 251 dv->sdev_state = state; 252 } 253 254 static void 255 sdev_attrinit(struct sdev_node *dv, vattr_t *vap) 256 { 257 timestruc_t now; 258 259 ASSERT(vap); 260 261 dv->sdev_attr = kmem_zalloc(sizeof (struct vattr), KM_SLEEP); 262 *dv->sdev_attr = *vap; 263 264 dv->sdev_attr->va_mode = MAKEIMODE(vap->va_type, vap->va_mode); 265 266 gethrestime(&now); 267 dv->sdev_attr->va_atime = now; 268 dv->sdev_attr->va_mtime = now; 269 dv->sdev_attr->va_ctime = now; 270 } 271 272 /* alloc and initialize a sdev_node */ 273 int 274 sdev_nodeinit(struct sdev_node *ddv, char *nm, struct sdev_node **newdv, 275 vattr_t *vap) 276 { 277 struct sdev_node *dv = NULL; 278 struct vnode *vp; 279 size_t nmlen, len; 280 devname_handle_t *dhl; 281 282 nmlen = strlen(nm) + 1; 283 if (nmlen > MAXNAMELEN) { 284 sdcmn_err9(("sdev_nodeinit: node name %s" 285 " too long\n", nm)); 286 *newdv = NULL; 287 return (ENAMETOOLONG); 288 } 289 290 dv = kmem_cache_alloc(sdev_node_cache, KM_SLEEP); 291 292 dv->sdev_name = kmem_alloc(nmlen, KM_SLEEP); 293 bcopy(nm, dv->sdev_name, nmlen); 294 dv->sdev_namelen = nmlen - 1; /* '\0' not included */ 295 len = strlen(ddv->sdev_path) + strlen(nm) + 2; 296 dv->sdev_path = kmem_alloc(len, KM_SLEEP); 297 (void) snprintf(dv->sdev_path, len, "%s/%s", ddv->sdev_path, nm); 298 /* overwritten for VLNK nodes */ 299 dv->sdev_symlink = NULL; 300 301 vp = SDEVTOV(dv); 302 vn_reinit(vp); 303 vp->v_vfsp = SDEVTOV(ddv)->v_vfsp; 304 if (vap) 305 vp->v_type = vap->va_type; 306 307 /* 308 * initialized to the parent's vnodeops. 309 * maybe overwriten for a VDIR 310 */ 311 vn_setops(vp, vn_getops(SDEVTOV(ddv))); 312 vn_exists(vp); 313 314 dv->sdev_dotdot = NULL; 315 dv->sdev_dot = NULL; 316 dv->sdev_next = NULL; 317 dv->sdev_attrvp = NULL; 318 if (vap) { 319 sdev_attrinit(dv, vap); 320 } else { 321 dv->sdev_attr = NULL; 322 } 323 324 dv->sdev_ino = sdev_mkino(dv); 325 dv->sdev_nlink = 0; /* updated on insert */ 326 dv->sdev_flags = ddv->sdev_flags; /* inherit from the parent first */ 327 dv->sdev_flags |= SDEV_BUILD; 328 mutex_init(&dv->sdev_lookup_lock, NULL, MUTEX_DEFAULT, NULL); 329 cv_init(&dv->sdev_lookup_cv, NULL, CV_DEFAULT, NULL); 330 if (SDEV_IS_GLOBAL(ddv)) { 331 dv->sdev_flags |= SDEV_GLOBAL; 332 dv->sdev_mapinfo = NULL; 333 dhl = &(dv->sdev_handle); 334 dhl->dh_data = dv; 335 dhl->dh_spec = DEVNAME_NS_NONE; 336 dhl->dh_args = NULL; 337 sdev_set_no_nocache(dv); 338 dv->sdev_gdir_gen = 0; 339 } else { 340 dv->sdev_flags &= ~SDEV_GLOBAL; 341 dv->sdev_origin = NULL; /* set later */ 342 bzero(&dv->sdev_prof, sizeof (dv->sdev_prof)); 343 dv->sdev_ldir_gen = 0; 344 dv->sdev_devtree_gen = 0; 345 } 346 347 rw_enter(&dv->sdev_contents, RW_WRITER); 348 sdev_set_nodestate(dv, SDEV_INIT); 349 rw_exit(&dv->sdev_contents); 350 *newdv = dv; 351 352 return (0); 353 } 354 355 /* 356 * transition a sdev_node into SDEV_READY state 357 */ 358 int 359 sdev_nodeready(struct sdev_node *dv, struct vattr *vap, struct vnode *avp, 360 void *args, struct cred *cred) 361 { 362 int error = 0; 363 struct vnode *vp = SDEVTOV(dv); 364 vtype_t type; 365 366 ASSERT(dv && (dv->sdev_state != SDEV_READY) && vap); 367 368 type = vap->va_type; 369 vp->v_type = type; 370 vp->v_rdev = vap->va_rdev; 371 rw_enter(&dv->sdev_contents, RW_WRITER); 372 if (type == VDIR) { 373 dv->sdev_nlink = 2; 374 dv->sdev_flags &= ~SDEV_PERSIST; 375 dv->sdev_flags &= ~SDEV_DYNAMIC; 376 vn_setops(vp, sdev_get_vop(dv)); /* from internal vtab */ 377 error = sdev_get_moduleops(dv); /* from plug-in module */ 378 ASSERT(dv->sdev_dotdot); 379 ASSERT(SDEVTOV(dv->sdev_dotdot)->v_type == VDIR); 380 vp->v_rdev = SDEVTOV(dv->sdev_dotdot)->v_rdev; 381 } else if (type == VLNK) { 382 ASSERT(args); 383 dv->sdev_nlink = 1; 384 dv->sdev_symlink = i_ddi_strdup((char *)args, KM_SLEEP); 385 } else { 386 dv->sdev_nlink = 1; 387 } 388 389 if (!(SDEV_IS_GLOBAL(dv))) { 390 dv->sdev_origin = (struct sdev_node *)args; 391 dv->sdev_flags &= ~SDEV_PERSIST; 392 } 393 394 /* 395 * shadow node is created here OR 396 * if failed (indicated by dv->sdev_attrvp == NULL), 397 * created later in sdev_setattr 398 */ 399 if (avp) { 400 dv->sdev_attrvp = avp; 401 } else { 402 if (dv->sdev_attr == NULL) 403 sdev_attrinit(dv, vap); 404 else 405 *dv->sdev_attr = *vap; 406 407 if ((SDEV_IS_PERSIST(dv) && (dv->sdev_attrvp == NULL)) || 408 ((SDEVTOV(dv)->v_type == VDIR) && 409 (dv->sdev_attrvp == NULL))) 410 error = sdev_shadow_node(dv, cred); 411 } 412 413 /* transition to READY state */ 414 sdev_set_nodestate(dv, SDEV_READY); 415 sdev_nc_node_exists(dv); 416 rw_exit(&dv->sdev_contents); 417 return (error); 418 } 419 420 /* 421 * setting ZOMBIE state 422 */ 423 static int 424 sdev_nodezombied(struct sdev_node *dv) 425 { 426 rw_enter(&dv->sdev_contents, RW_WRITER); 427 sdev_set_nodestate(dv, SDEV_ZOMBIE); 428 rw_exit(&dv->sdev_contents); 429 return (0); 430 } 431 432 /* 433 * Build the VROOT sdev_node. 434 */ 435 /*ARGSUSED*/ 436 struct sdev_node * 437 sdev_mkroot(struct vfs *vfsp, dev_t devdev, struct vnode *mvp, 438 struct vnode *avp, struct cred *cred) 439 { 440 struct sdev_node *dv; 441 struct vnode *vp; 442 char devdir[] = "/dev"; 443 444 ASSERT(sdev_node_cache != NULL); 445 ASSERT(avp); 446 dv = kmem_cache_alloc(sdev_node_cache, KM_SLEEP); 447 vp = SDEVTOV(dv); 448 vn_reinit(vp); 449 vp->v_flag |= VROOT; 450 vp->v_vfsp = vfsp; 451 vp->v_type = VDIR; 452 vp->v_rdev = devdev; 453 vn_setops(vp, sdev_vnodeops); /* apply the default vnodeops at /dev */ 454 vn_exists(vp); 455 456 if (vfsp->vfs_mntpt) 457 dv->sdev_name = i_ddi_strdup( 458 (char *)refstr_value(vfsp->vfs_mntpt), KM_SLEEP); 459 else 460 /* vfs_mountdev1 set mount point later */ 461 dv->sdev_name = i_ddi_strdup("/dev", KM_SLEEP); 462 dv->sdev_namelen = strlen(dv->sdev_name); /* '\0' not included */ 463 dv->sdev_path = i_ddi_strdup(devdir, KM_SLEEP); 464 dv->sdev_ino = SDEV_ROOTINO; 465 dv->sdev_nlink = 2; /* name + . (no sdev_insert) */ 466 dv->sdev_dotdot = dv; /* .. == self */ 467 dv->sdev_attrvp = avp; 468 dv->sdev_attr = NULL; 469 mutex_init(&dv->sdev_lookup_lock, NULL, MUTEX_DEFAULT, NULL); 470 cv_init(&dv->sdev_lookup_cv, NULL, CV_DEFAULT, NULL); 471 if (strcmp(dv->sdev_name, "/dev") == 0) { 472 mutex_init(&devname_nsmaps_lock, NULL, MUTEX_DEFAULT, NULL); 473 dv->sdev_mapinfo = NULL; 474 dv->sdev_flags = SDEV_BUILD|SDEV_GLOBAL|SDEV_PERSIST; 475 bzero(&dv->sdev_handle, sizeof (dv->sdev_handle)); 476 dv->sdev_gdir_gen = 0; 477 } else { 478 dv->sdev_flags = SDEV_BUILD; 479 dv->sdev_flags &= ~SDEV_PERSIST; 480 bzero(&dv->sdev_prof, sizeof (dv->sdev_prof)); 481 dv->sdev_ldir_gen = 0; 482 dv->sdev_devtree_gen = 0; 483 } 484 485 rw_enter(&dv->sdev_contents, RW_WRITER); 486 sdev_set_nodestate(dv, SDEV_READY); 487 rw_exit(&dv->sdev_contents); 488 sdev_nc_node_exists(dv); 489 return (dv); 490 } 491 492 /* 493 * 1. load the module 494 * 2. modload invokes sdev_module_register, which in turn sets 495 * the dv->sdev_mapinfo->dir_ops 496 * 497 * note: locking order: 498 * dv->sdev_contents -> map->dir_lock 499 */ 500 static int 501 sdev_get_moduleops(struct sdev_node *dv) 502 { 503 int error = 0; 504 struct devname_nsmap *map = NULL; 505 char *module; 506 char *path; 507 int load = 1; 508 509 ASSERT(SDEVTOV(dv)->v_type == VDIR); 510 511 if (devname_nsmaps == NULL) 512 return (0); 513 514 if (!sdev_nsmaps_loaded() && !sdev_nsmaps_reloaded()) 515 return (0); 516 517 518 path = dv->sdev_path; 519 if ((map = sdev_get_nsmap_by_dir(path, 0))) { 520 rw_enter(&map->dir_lock, RW_READER); 521 if (map->dir_invalid) { 522 if (map->dir_module && map->dir_newmodule && 523 (strcmp(map->dir_module, 524 map->dir_newmodule) == 0)) { 525 load = 0; 526 } 527 sdev_replace_nsmap(map, map->dir_newmodule, 528 map->dir_newmap); 529 } 530 531 module = map->dir_module; 532 if (module && load) { 533 sdcmn_err6(("sdev_get_moduleops: " 534 "load module %s", module)); 535 rw_exit(&map->dir_lock); 536 error = modload("devname", module); 537 sdcmn_err6(("sdev_get_moduleops: error %d\n", error)); 538 if (error < 0) { 539 return (-1); 540 } 541 } else if (module == NULL) { 542 /* 543 * loading the module ops for name services 544 */ 545 if (devname_ns_ops == NULL) { 546 sdcmn_err6(( 547 "sdev_get_moduleops: modload default\n")); 548 error = modload("devname", DEVNAME_NSCONFIG); 549 sdcmn_err6(( 550 "sdev_get_moduleops: error %d\n", error)); 551 if (error < 0) { 552 return (-1); 553 } 554 } 555 556 if (!rw_tryupgrade(&map->dir_lock)) { 557 rw_exit(&map->dir_lock); 558 rw_enter(&map->dir_lock, RW_WRITER); 559 } 560 ASSERT(devname_ns_ops); 561 map->dir_ops = devname_ns_ops; 562 rw_exit(&map->dir_lock); 563 } 564 } 565 566 dv->sdev_mapinfo = map; 567 return (0); 568 } 569 570 /* directory dependent vop table */ 571 struct sdev_vop_table { 572 char *vt_name; /* subdirectory name */ 573 const fs_operation_def_t *vt_service; /* vnodeops table */ 574 struct vnodeops *vt_vops; /* constructed vop */ 575 struct vnodeops **vt_global_vops; /* global container for vop */ 576 int (*vt_vtor)(struct sdev_node *); /* validate sdev_node */ 577 int vt_flags; 578 }; 579 580 /* 581 * A nice improvement would be to provide a plug-in mechanism 582 * for this table instead of a const table. 583 */ 584 static struct sdev_vop_table vtab[] = 585 { 586 { "pts", devpts_vnodeops_tbl, NULL, &devpts_vnodeops, devpts_validate, 587 SDEV_DYNAMIC | SDEV_VTOR }, 588 589 { "zcons", NULL, NULL, NULL, NULL, SDEV_NO_NCACHE }, 590 591 { NULL, NULL, NULL, NULL, NULL, 0} 592 }; 593 594 595 /* 596 * sets a directory's vnodeops if the directory is in the vtab; 597 */ 598 static struct vnodeops * 599 sdev_get_vop(struct sdev_node *dv) 600 { 601 int i; 602 char *path; 603 604 path = dv->sdev_path; 605 ASSERT(path); 606 607 /* gets the relative path to /dev/ */ 608 path += 5; 609 610 /* gets the vtab entry if matches */ 611 for (i = 0; vtab[i].vt_name; i++) { 612 if (strcmp(vtab[i].vt_name, path) != 0) 613 continue; 614 dv->sdev_flags |= vtab[i].vt_flags; 615 616 if (vtab[i].vt_vops) { 617 if (vtab[i].vt_global_vops) 618 *(vtab[i].vt_global_vops) = vtab[i].vt_vops; 619 return (vtab[i].vt_vops); 620 } 621 622 if (vtab[i].vt_service) { 623 fs_operation_def_t *templ; 624 templ = sdev_merge_vtab(vtab[i].vt_service); 625 if (vn_make_ops(vtab[i].vt_name, 626 (const fs_operation_def_t *)templ, 627 &vtab[i].vt_vops) != 0) { 628 cmn_err(CE_PANIC, "%s: malformed vnode ops\n", 629 vtab[i].vt_name); 630 /*NOTREACHED*/ 631 } 632 if (vtab[i].vt_global_vops) { 633 *(vtab[i].vt_global_vops) = vtab[i].vt_vops; 634 } 635 sdev_free_vtab(templ); 636 return (vtab[i].vt_vops); 637 } 638 return (sdev_vnodeops); 639 } 640 641 /* child inherits the persistence of the parent */ 642 if (SDEV_IS_PERSIST(dv->sdev_dotdot)) 643 dv->sdev_flags |= SDEV_PERSIST; 644 645 return (sdev_vnodeops); 646 } 647 648 static void 649 sdev_set_no_nocache(struct sdev_node *dv) 650 { 651 int i; 652 char *path; 653 654 ASSERT(dv->sdev_path); 655 path = dv->sdev_path + strlen("/dev/"); 656 657 for (i = 0; vtab[i].vt_name; i++) { 658 if (strcmp(vtab[i].vt_name, path) == 0) { 659 if (vtab[i].vt_flags & SDEV_NO_NCACHE) 660 dv->sdev_flags |= SDEV_NO_NCACHE; 661 break; 662 } 663 } 664 } 665 666 void * 667 sdev_get_vtor(struct sdev_node *dv) 668 { 669 int i; 670 671 for (i = 0; vtab[i].vt_name; i++) { 672 if (strcmp(vtab[i].vt_name, dv->sdev_name) != 0) 673 continue; 674 return ((void *)vtab[i].vt_vtor); 675 } 676 return (NULL); 677 } 678 679 /* 680 * Build the base root inode 681 */ 682 ino_t 683 sdev_mkino(struct sdev_node *dv) 684 { 685 ino_t ino; 686 687 /* 688 * for now, follow the lead of tmpfs here 689 * need to someday understand the requirements here 690 */ 691 ino = (ino_t)(uint32_t)((uintptr_t)dv >> 3); 692 ino += SDEV_ROOTINO + 1; 693 694 return (ino); 695 } 696 697 static int 698 sdev_getlink(struct vnode *linkvp, char **link) 699 { 700 int err; 701 char *buf; 702 struct uio uio = {0}; 703 struct iovec iov = {0}; 704 705 if (linkvp == NULL) 706 return (ENOENT); 707 ASSERT(linkvp->v_type == VLNK); 708 709 buf = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 710 iov.iov_base = buf; 711 iov.iov_len = MAXPATHLEN; 712 uio.uio_iov = &iov; 713 uio.uio_iovcnt = 1; 714 uio.uio_resid = MAXPATHLEN; 715 uio.uio_segflg = UIO_SYSSPACE; 716 uio.uio_llimit = MAXOFFSET_T; 717 718 err = VOP_READLINK(linkvp, &uio, kcred); 719 if (err) { 720 cmn_err(CE_WARN, "readlink %s failed in dev\n", buf); 721 kmem_free(buf, MAXPATHLEN); 722 return (ENOENT); 723 } 724 725 /* mission complete */ 726 *link = i_ddi_strdup(buf, KM_SLEEP); 727 kmem_free(buf, MAXPATHLEN); 728 return (0); 729 } 730 731 /* 732 * A convenient wrapper to get the devfs node vnode for a device 733 * minor functionality: readlink() of a /dev symlink 734 * Place the link into dv->sdev_symlink 735 */ 736 static int 737 sdev_follow_link(struct sdev_node *dv) 738 { 739 int err; 740 struct vnode *linkvp; 741 char *link = NULL; 742 743 linkvp = SDEVTOV(dv); 744 if (linkvp == NULL) 745 return (ENOENT); 746 ASSERT(linkvp->v_type == VLNK); 747 err = sdev_getlink(linkvp, &link); 748 if (err) { 749 (void) sdev_nodezombied(dv); 750 dv->sdev_symlink = NULL; 751 return (ENOENT); 752 } 753 754 ASSERT(link != NULL); 755 dv->sdev_symlink = link; 756 return (0); 757 } 758 759 static int 760 sdev_node_check(struct sdev_node *dv, struct vattr *nvap, void *nargs) 761 { 762 vtype_t otype = SDEVTOV(dv)->v_type; 763 764 /* 765 * existing sdev_node has a different type. 766 */ 767 if (otype != nvap->va_type) { 768 sdcmn_err9(("sdev_node_check: existing node " 769 " %s type %d does not match new node type %d\n", 770 dv->sdev_name, otype, nvap->va_type)); 771 return (EEXIST); 772 } 773 774 /* 775 * For a symlink, the target should be the same. 776 */ 777 if (otype == VLNK) { 778 ASSERT(nargs != NULL); 779 ASSERT(dv->sdev_symlink != NULL); 780 if (strcmp(dv->sdev_symlink, (char *)nargs) != 0) { 781 sdcmn_err9(("sdev_node_check: existing node " 782 " %s has different symlink %s as new node " 783 " %s\n", dv->sdev_name, dv->sdev_symlink, 784 (char *)nargs)); 785 return (EEXIST); 786 } 787 } 788 789 return (0); 790 } 791 792 /* 793 * sdev_mknode - a wrapper for sdev_nodeinit(), sdev_nodeready() 794 * 795 * arguments: 796 * - ddv (parent) 797 * - nm (child name) 798 * - newdv (sdev_node for nm is returned here) 799 * - vap (vattr for the node to be created, va_type should be set. 800 * the defaults should be used if unknown) 801 * - cred 802 * - args 803 * . tnm (for VLNK) 804 * . global sdev_node (for !SDEV_GLOBAL) 805 * - state: SDEV_INIT, SDEV_READY 806 * 807 * only ddv, nm, newddv, vap, cred are required for sdev_mknode(SDEV_INIT) 808 * 809 * NOTE: directory contents writers lock needs to be held before 810 * calling this routine. 811 */ 812 int 813 sdev_mknode(struct sdev_node *ddv, char *nm, struct sdev_node **newdv, 814 struct vattr *vap, struct vnode *avp, void *args, struct cred *cred, 815 sdev_node_state_t state) 816 { 817 int error = 0; 818 sdev_node_state_t node_state; 819 struct sdev_node *dv = NULL; 820 821 ASSERT(state != SDEV_ZOMBIE); 822 ASSERT(RW_WRITE_HELD(&ddv->sdev_contents)); 823 824 if (*newdv) { 825 dv = *newdv; 826 } else { 827 /* allocate and initialize a sdev_node */ 828 if (ddv->sdev_state == SDEV_ZOMBIE) { 829 sdcmn_err9(("sdev_mknode: parent %s ZOMBIEd\n", 830 ddv->sdev_path)); 831 return (ENOENT); 832 } 833 834 error = sdev_nodeinit(ddv, nm, &dv, vap); 835 if (error != 0) { 836 sdcmn_err9(("sdev_mknode: error %d," 837 " name %s can not be initialized\n", 838 error, nm)); 839 return (ENOENT); 840 } 841 ASSERT(dv); 842 843 /* insert into the directory cache */ 844 error = sdev_cache_update(ddv, &dv, nm, SDEV_CACHE_ADD); 845 if (error) { 846 sdcmn_err9(("sdev_mknode: node %s can not" 847 " be added into directory cache\n", nm)); 848 return (ENOENT); 849 } 850 } 851 852 ASSERT(dv); 853 node_state = dv->sdev_state; 854 ASSERT(node_state != SDEV_ZOMBIE); 855 856 if (state == SDEV_READY) { 857 switch (node_state) { 858 case SDEV_INIT: 859 error = sdev_nodeready(dv, vap, avp, args, cred); 860 /* 861 * masking the errors with ENOENT 862 */ 863 if (error) { 864 sdcmn_err9(("sdev_mknode: node %s can NOT" 865 " be transitioned into READY state, " 866 "error %d\n", nm, error)); 867 error = ENOENT; 868 } 869 break; 870 case SDEV_READY: 871 /* 872 * Do some sanity checking to make sure 873 * the existing sdev_node is what has been 874 * asked for. 875 */ 876 error = sdev_node_check(dv, vap, args); 877 break; 878 default: 879 break; 880 } 881 } 882 883 if (!error) { 884 *newdv = dv; 885 ASSERT((*newdv)->sdev_state != SDEV_ZOMBIE); 886 } else { 887 SDEV_SIMPLE_RELE(dv); 888 *newdv = NULL; 889 } 890 891 return (error); 892 } 893 894 /* 895 * convenient wrapper to change vp's ATIME, CTIME and ATIME 896 */ 897 void 898 sdev_update_timestamps(struct vnode *vp, cred_t *cred, uint_t mask) 899 { 900 struct vattr attr; 901 timestruc_t now; 902 int err; 903 904 ASSERT(vp); 905 gethrestime(&now); 906 if (mask & AT_CTIME) 907 attr.va_ctime = now; 908 if (mask & AT_MTIME) 909 attr.va_mtime = now; 910 if (mask & AT_ATIME) 911 attr.va_atime = now; 912 913 attr.va_mask = (mask & AT_TIMES); 914 err = VOP_SETATTR(vp, &attr, 0, cred, NULL); 915 if (err && (err != EROFS)) { 916 sdcmn_err(("update timestamps error %d\n", err)); 917 } 918 } 919 920 /* 921 * the backing store vnode is released here 922 */ 923 /*ARGSUSED1*/ 924 void 925 sdev_nodedestroy(struct sdev_node *dv, uint_t flags) 926 { 927 /* no references */ 928 ASSERT(dv->sdev_nlink == 0); 929 930 if (dv->sdev_attrvp != NULLVP) { 931 VN_RELE(dv->sdev_attrvp); 932 /* 933 * reset the attrvp so that no more 934 * references can be made on this already 935 * vn_rele() vnode 936 */ 937 dv->sdev_attrvp = NULLVP; 938 } 939 940 if (dv->sdev_attr != NULL) { 941 kmem_free(dv->sdev_attr, sizeof (struct vattr)); 942 dv->sdev_attr = NULL; 943 } 944 945 if (dv->sdev_name != NULL) { 946 kmem_free(dv->sdev_name, dv->sdev_namelen + 1); 947 dv->sdev_name = NULL; 948 } 949 950 if (dv->sdev_symlink != NULL) { 951 kmem_free(dv->sdev_symlink, strlen(dv->sdev_symlink) + 1); 952 dv->sdev_symlink = NULL; 953 } 954 955 if (dv->sdev_path) { 956 kmem_free(dv->sdev_path, strlen(dv->sdev_path) + 1); 957 dv->sdev_path = NULL; 958 } 959 960 if (!SDEV_IS_GLOBAL(dv)) 961 sdev_prof_free(dv); 962 963 mutex_destroy(&dv->sdev_lookup_lock); 964 cv_destroy(&dv->sdev_lookup_cv); 965 966 /* return node to initial state as per constructor */ 967 (void) memset((void *)&dv->sdev_instance_data, 0, 968 sizeof (dv->sdev_instance_data)); 969 vn_invalid(SDEVTOV(dv)); 970 kmem_cache_free(sdev_node_cache, dv); 971 } 972 973 /* 974 * DIRECTORY CACHE lookup 975 */ 976 struct sdev_node * 977 sdev_findbyname(struct sdev_node *ddv, char *nm) 978 { 979 struct sdev_node *dv; 980 size_t nmlen = strlen(nm); 981 982 ASSERT(RW_LOCK_HELD(&ddv->sdev_contents)); 983 for (dv = ddv->sdev_dot; dv; dv = dv->sdev_next) { 984 if (dv->sdev_namelen != nmlen) { 985 continue; 986 } 987 988 /* 989 * Can't lookup stale nodes 990 */ 991 if (dv->sdev_flags & SDEV_STALE) { 992 sdcmn_err9(( 993 "sdev_findbyname: skipped stale node: %s\n", 994 dv->sdev_name)); 995 continue; 996 } 997 998 if (strcmp(dv->sdev_name, nm) == 0) { 999 SDEV_HOLD(dv); 1000 return (dv); 1001 } 1002 } 1003 return (NULL); 1004 } 1005 1006 /* 1007 * Inserts a new sdev_node in a parent directory 1008 */ 1009 void 1010 sdev_direnter(struct sdev_node *ddv, struct sdev_node *dv) 1011 { 1012 ASSERT(RW_WRITE_HELD(&ddv->sdev_contents)); 1013 ASSERT(SDEVTOV(ddv)->v_type == VDIR); 1014 ASSERT(ddv->sdev_nlink >= 2); 1015 ASSERT(dv->sdev_nlink == 0); 1016 1017 dv->sdev_dotdot = ddv; 1018 dv->sdev_next = ddv->sdev_dot; 1019 ddv->sdev_dot = dv; 1020 ddv->sdev_nlink++; 1021 } 1022 1023 /* 1024 * The following check is needed because while sdev_nodes are linked 1025 * in SDEV_INIT state, they have their link counts incremented only 1026 * in SDEV_READY state. 1027 */ 1028 static void 1029 decr_link(struct sdev_node *dv) 1030 { 1031 if (dv->sdev_state != SDEV_INIT) 1032 dv->sdev_nlink--; 1033 else 1034 ASSERT(dv->sdev_nlink == 0); 1035 } 1036 1037 /* 1038 * Delete an existing dv from directory cache 1039 * 1040 * In the case of a node is still held by non-zero reference count, 1041 * the node is put into ZOMBIE state. Once the reference count 1042 * reaches "0", the node is unlinked and destroyed, 1043 * in sdev_inactive(). 1044 */ 1045 static int 1046 sdev_dirdelete(struct sdev_node *ddv, struct sdev_node *dv) 1047 { 1048 struct sdev_node *idv; 1049 struct sdev_node *prev = NULL; 1050 struct vnode *vp; 1051 1052 ASSERT(RW_WRITE_HELD(&ddv->sdev_contents)); 1053 1054 vp = SDEVTOV(dv); 1055 mutex_enter(&vp->v_lock); 1056 1057 /* dv is held still */ 1058 if (vp->v_count > 1) { 1059 rw_enter(&dv->sdev_contents, RW_WRITER); 1060 if (dv->sdev_state == SDEV_READY) { 1061 sdcmn_err9(( 1062 "sdev_delete: node %s busy with count %d\n", 1063 dv->sdev_name, vp->v_count)); 1064 dv->sdev_state = SDEV_ZOMBIE; 1065 } 1066 rw_exit(&dv->sdev_contents); 1067 --vp->v_count; 1068 mutex_exit(&vp->v_lock); 1069 return (EBUSY); 1070 } 1071 ASSERT(vp->v_count == 1); 1072 1073 /* unlink from the memory cache */ 1074 ddv->sdev_nlink--; /* .. to above */ 1075 if (vp->v_type == VDIR) { 1076 decr_link(dv); /* . to self */ 1077 } 1078 1079 for (idv = ddv->sdev_dot; idv && idv != dv; 1080 prev = idv, idv = idv->sdev_next) 1081 ; 1082 ASSERT(idv == dv); /* node to be deleted must exist */ 1083 if (prev == NULL) 1084 ddv->sdev_dot = dv->sdev_next; 1085 else 1086 prev->sdev_next = dv->sdev_next; 1087 dv->sdev_next = NULL; 1088 decr_link(dv); /* name, back to zero */ 1089 vp->v_count--; 1090 mutex_exit(&vp->v_lock); 1091 1092 /* destroy the node */ 1093 sdev_nodedestroy(dv, 0); 1094 return (0); 1095 } 1096 1097 /* 1098 * check if the source is in the path of the target 1099 * 1100 * source and target are different 1101 */ 1102 /*ARGSUSED2*/ 1103 static int 1104 sdev_checkpath(struct sdev_node *sdv, struct sdev_node *tdv, struct cred *cred) 1105 { 1106 int error = 0; 1107 struct sdev_node *dotdot, *dir; 1108 1109 dotdot = tdv->sdev_dotdot; 1110 ASSERT(dotdot); 1111 1112 /* fs root */ 1113 if (dotdot == tdv) { 1114 return (0); 1115 } 1116 1117 for (;;) { 1118 /* 1119 * avoid error cases like 1120 * mv a a/b 1121 * mv a a/b/c 1122 * etc. 1123 */ 1124 if (dotdot == sdv) { 1125 error = EINVAL; 1126 break; 1127 } 1128 1129 dir = dotdot; 1130 dotdot = dir->sdev_dotdot; 1131 1132 /* done checking because root is reached */ 1133 if (dir == dotdot) { 1134 break; 1135 } 1136 } 1137 return (error); 1138 } 1139 1140 int 1141 sdev_rnmnode(struct sdev_node *oddv, struct sdev_node *odv, 1142 struct sdev_node *nddv, struct sdev_node **ndvp, char *nnm, 1143 struct cred *cred) 1144 { 1145 int error = 0; 1146 struct vnode *ovp = SDEVTOV(odv); 1147 struct vnode *nvp; 1148 struct vattr vattr; 1149 int doingdir = (ovp->v_type == VDIR); 1150 char *link = NULL; 1151 int samedir = (oddv == nddv) ? 1 : 0; 1152 int bkstore = 0; 1153 struct sdev_node *idv = NULL; 1154 struct sdev_node *ndv = NULL; 1155 timestruc_t now; 1156 1157 vattr.va_mask = AT_MODE|AT_UID|AT_GID; 1158 error = VOP_GETATTR(ovp, &vattr, 0, cred); 1159 if (error) 1160 return (error); 1161 1162 if (!samedir) 1163 rw_enter(&oddv->sdev_contents, RW_WRITER); 1164 rw_enter(&nddv->sdev_contents, RW_WRITER); 1165 1166 /* 1167 * the source may have been deleted by another thread before 1168 * we gets here. 1169 */ 1170 if (odv->sdev_state != SDEV_READY) { 1171 error = ENOENT; 1172 goto err_out; 1173 } 1174 1175 if (doingdir && (odv == nddv)) { 1176 error = EINVAL; 1177 goto err_out; 1178 } 1179 1180 /* 1181 * If renaming a directory, and the parents are different (".." must be 1182 * changed) then the source dir must not be in the dir hierarchy above 1183 * the target since it would orphan everything below the source dir. 1184 */ 1185 if (doingdir && (oddv != nddv)) { 1186 error = sdev_checkpath(odv, nddv, cred); 1187 if (error) 1188 goto err_out; 1189 } 1190 1191 /* destination existing */ 1192 if (*ndvp) { 1193 nvp = SDEVTOV(*ndvp); 1194 ASSERT(nvp); 1195 1196 /* handling renaming to itself */ 1197 if (odv == *ndvp) { 1198 error = 0; 1199 goto err_out; 1200 } 1201 1202 if (nvp->v_type == VDIR) { 1203 if (!doingdir) { 1204 error = EISDIR; 1205 goto err_out; 1206 } 1207 1208 if (vn_vfswlock(nvp)) { 1209 error = EBUSY; 1210 goto err_out; 1211 } 1212 1213 if (vn_mountedvfs(nvp) != NULL) { 1214 vn_vfsunlock(nvp); 1215 error = EBUSY; 1216 goto err_out; 1217 } 1218 1219 /* in case dir1 exists in dir2 and "mv dir1 dir2" */ 1220 if ((*ndvp)->sdev_nlink > 2) { 1221 vn_vfsunlock(nvp); 1222 error = EEXIST; 1223 goto err_out; 1224 } 1225 vn_vfsunlock(nvp); 1226 1227 (void) sdev_dirdelete(nddv, *ndvp); 1228 *ndvp = NULL; 1229 error = VOP_RMDIR(nddv->sdev_attrvp, nnm, 1230 nddv->sdev_attrvp, cred); 1231 if (error) 1232 goto err_out; 1233 } else { 1234 if (doingdir) { 1235 error = ENOTDIR; 1236 goto err_out; 1237 } 1238 1239 if (SDEV_IS_PERSIST((*ndvp))) { 1240 bkstore = 1; 1241 } 1242 1243 /* 1244 * get rid of the node from the directory cache 1245 * note, in case EBUSY is returned, the ZOMBIE 1246 * node is taken care in sdev_mknode. 1247 */ 1248 (void) sdev_dirdelete(nddv, *ndvp); 1249 *ndvp = NULL; 1250 if (bkstore) { 1251 error = VOP_REMOVE(nddv->sdev_attrvp, 1252 nnm, cred); 1253 if (error) 1254 goto err_out; 1255 } 1256 } 1257 } 1258 1259 /* fix the source for a symlink */ 1260 if (vattr.va_type == VLNK) { 1261 if (odv->sdev_symlink == NULL) { 1262 error = sdev_follow_link(odv); 1263 if (error) { 1264 error = ENOENT; 1265 goto err_out; 1266 } 1267 } 1268 ASSERT(odv->sdev_symlink); 1269 link = i_ddi_strdup(odv->sdev_symlink, KM_SLEEP); 1270 } 1271 1272 /* 1273 * make a fresh node from the source attrs 1274 */ 1275 ASSERT(RW_WRITE_HELD(&nddv->sdev_contents)); 1276 error = sdev_mknode(nddv, nnm, ndvp, &vattr, 1277 NULL, (void *)link, cred, SDEV_READY); 1278 1279 if (link) 1280 kmem_free(link, strlen(link) + 1); 1281 1282 if (error) 1283 goto err_out; 1284 ASSERT(*ndvp); 1285 ASSERT((*ndvp)->sdev_state == SDEV_READY); 1286 1287 /* move dir contents */ 1288 if (doingdir) { 1289 for (idv = odv->sdev_dot; idv; idv = idv->sdev_next) { 1290 error = sdev_rnmnode(odv, idv, 1291 (struct sdev_node *)(*ndvp), &ndv, 1292 idv->sdev_name, cred); 1293 1294 if (error) 1295 goto err_out; 1296 ndv = NULL; 1297 } 1298 1299 } 1300 1301 if ((*ndvp)->sdev_attrvp) { 1302 sdev_update_timestamps((*ndvp)->sdev_attrvp, kcred, 1303 AT_CTIME|AT_ATIME); 1304 } else { 1305 ASSERT((*ndvp)->sdev_attr); 1306 gethrestime(&now); 1307 (*ndvp)->sdev_attr->va_ctime = now; 1308 (*ndvp)->sdev_attr->va_atime = now; 1309 } 1310 1311 if (nddv->sdev_attrvp) { 1312 sdev_update_timestamps(nddv->sdev_attrvp, kcred, 1313 AT_MTIME|AT_ATIME); 1314 } else { 1315 ASSERT(nddv->sdev_attr); 1316 gethrestime(&now); 1317 nddv->sdev_attr->va_mtime = now; 1318 nddv->sdev_attr->va_atime = now; 1319 } 1320 rw_exit(&nddv->sdev_contents); 1321 if (!samedir) 1322 rw_exit(&oddv->sdev_contents); 1323 1324 SDEV_RELE(*ndvp); 1325 return (error); 1326 1327 err_out: 1328 rw_exit(&nddv->sdev_contents); 1329 if (!samedir) 1330 rw_exit(&oddv->sdev_contents); 1331 return (error); 1332 } 1333 1334 /* 1335 * Merge sdev_node specific information into an attribute structure. 1336 * 1337 * note: sdev_node is not locked here 1338 */ 1339 void 1340 sdev_vattr_merge(struct sdev_node *dv, struct vattr *vap) 1341 { 1342 struct vnode *vp = SDEVTOV(dv); 1343 1344 vap->va_nlink = dv->sdev_nlink; 1345 vap->va_nodeid = dv->sdev_ino; 1346 vap->va_fsid = SDEVTOV(dv->sdev_dotdot)->v_rdev; 1347 vap->va_type = vp->v_type; 1348 1349 if (vp->v_type == VDIR) { 1350 vap->va_rdev = 0; 1351 vap->va_fsid = vp->v_rdev; 1352 } else if (vp->v_type == VLNK) { 1353 vap->va_rdev = 0; 1354 vap->va_mode &= ~S_IFMT; 1355 vap->va_mode |= S_IFLNK; 1356 } else if ((vp->v_type == VCHR) || (vp->v_type == VBLK)) { 1357 vap->va_rdev = vp->v_rdev; 1358 vap->va_mode &= ~S_IFMT; 1359 if (vap->va_type == VCHR) 1360 vap->va_mode |= S_IFCHR; 1361 else 1362 vap->va_mode |= S_IFBLK; 1363 } else { 1364 vap->va_rdev = 0; 1365 } 1366 } 1367 1368 static struct vattr * 1369 sdev_getdefault_attr(enum vtype type) 1370 { 1371 if (type == VDIR) 1372 return (&sdev_vattr_dir); 1373 else if (type == VCHR) 1374 return (&sdev_vattr_chr); 1375 else if (type == VBLK) 1376 return (&sdev_vattr_blk); 1377 else if (type == VLNK) 1378 return (&sdev_vattr_lnk); 1379 else 1380 return (NULL); 1381 } 1382 int 1383 sdev_to_vp(struct sdev_node *dv, struct vnode **vpp) 1384 { 1385 int rv = 0; 1386 struct vnode *vp = SDEVTOV(dv); 1387 1388 switch (vp->v_type) { 1389 case VCHR: 1390 case VBLK: 1391 /* 1392 * If vnode is a device, return special vnode instead 1393 * (though it knows all about -us- via sp->s_realvp) 1394 */ 1395 *vpp = specvp(vp, vp->v_rdev, vp->v_type, kcred); 1396 VN_RELE(vp); 1397 if (*vpp == NULLVP) 1398 rv = ENOSYS; 1399 break; 1400 default: /* most types are returned as is */ 1401 *vpp = vp; 1402 break; 1403 } 1404 return (rv); 1405 } 1406 1407 /* 1408 * loopback into sdev_lookup() 1409 */ 1410 static struct vnode * 1411 devname_find_by_devpath(char *devpath, struct vattr *vattr) 1412 { 1413 int error = 0; 1414 struct vnode *vp; 1415 1416 error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULLVPP, &vp); 1417 if (error) { 1418 return (NULL); 1419 } 1420 1421 if (vattr) 1422 (void) VOP_GETATTR(vp, vattr, 0, kcred); 1423 return (vp); 1424 } 1425 1426 /* 1427 * the junction between devname and devfs 1428 */ 1429 static struct vnode * 1430 devname_configure_by_path(char *physpath, struct vattr *vattr) 1431 { 1432 int error = 0; 1433 struct vnode *vp; 1434 1435 ASSERT(strncmp(physpath, "/devices/", sizeof ("/devices/") - 1) 1436 == 0); 1437 1438 error = devfs_lookupname(physpath + sizeof ("/devices/") - 1, 1439 NULLVPP, &vp); 1440 if (error != 0) { 1441 if (error == ENODEV) { 1442 cmn_err(CE_CONT, "%s: not found (line %d)\n", 1443 physpath, __LINE__); 1444 } 1445 1446 return (NULL); 1447 } 1448 1449 if (vattr) 1450 (void) VOP_GETATTR(vp, vattr, 0, kcred); 1451 return (vp); 1452 } 1453 1454 /* 1455 * junction between devname and root file system, e.g. ufs 1456 */ 1457 int 1458 devname_backstore_lookup(struct sdev_node *ddv, char *nm, struct vnode **rvp) 1459 { 1460 struct vnode *rdvp = ddv->sdev_attrvp; 1461 int rval = 0; 1462 1463 ASSERT(rdvp); 1464 1465 rval = VOP_LOOKUP(rdvp, nm, rvp, NULL, 0, NULL, kcred); 1466 return (rval); 1467 } 1468 1469 static int 1470 sdev_filldir_from_store(struct sdev_node *ddv, int dlen, struct cred *cred) 1471 { 1472 struct sdev_node *dv = NULL; 1473 char *nm; 1474 struct vnode *dirvp; 1475 int error; 1476 vnode_t *vp; 1477 int eof; 1478 struct iovec iov; 1479 struct uio uio; 1480 struct dirent64 *dp; 1481 dirent64_t *dbuf; 1482 size_t dbuflen; 1483 struct vattr vattr; 1484 char *link = NULL; 1485 1486 if (ddv->sdev_attrvp == NULL) 1487 return (0); 1488 if (!(ddv->sdev_flags & SDEV_BUILD)) 1489 return (0); 1490 1491 dirvp = ddv->sdev_attrvp; 1492 VN_HOLD(dirvp); 1493 dbuf = kmem_zalloc(dlen, KM_SLEEP); 1494 1495 uio.uio_iov = &iov; 1496 uio.uio_iovcnt = 1; 1497 uio.uio_segflg = UIO_SYSSPACE; 1498 uio.uio_fmode = 0; 1499 uio.uio_extflg = UIO_COPY_CACHED; 1500 uio.uio_loffset = 0; 1501 uio.uio_llimit = MAXOFFSET_T; 1502 1503 eof = 0; 1504 error = 0; 1505 while (!error && !eof) { 1506 uio.uio_resid = dlen; 1507 iov.iov_base = (char *)dbuf; 1508 iov.iov_len = dlen; 1509 (void) VOP_RWLOCK(dirvp, V_WRITELOCK_FALSE, NULL); 1510 error = VOP_READDIR(dirvp, &uio, kcred, &eof); 1511 VOP_RWUNLOCK(dirvp, V_WRITELOCK_FALSE, NULL); 1512 1513 dbuflen = dlen - uio.uio_resid; 1514 if (error || dbuflen == 0) 1515 break; 1516 1517 if (!(ddv->sdev_flags & SDEV_BUILD)) { 1518 error = 0; 1519 break; 1520 } 1521 1522 for (dp = dbuf; ((intptr_t)dp < 1523 (intptr_t)dbuf + dbuflen); 1524 dp = (dirent64_t *)((intptr_t)dp + dp->d_reclen)) { 1525 nm = dp->d_name; 1526 1527 if (strcmp(nm, ".") == 0 || 1528 strcmp(nm, "..") == 0) 1529 continue; 1530 1531 vp = NULLVP; 1532 dv = sdev_cache_lookup(ddv, nm); 1533 if (dv) { 1534 if (dv->sdev_state != SDEV_ZOMBIE) { 1535 SDEV_SIMPLE_RELE(dv); 1536 } else { 1537 /* 1538 * A ZOMBIE node may not have been 1539 * cleaned up from the backing store, 1540 * bypass this entry in this case, 1541 * and clean it up from the directory 1542 * cache if this is the last call. 1543 */ 1544 (void) sdev_dirdelete(ddv, dv); 1545 } 1546 continue; 1547 } 1548 1549 /* refill the cache if not already */ 1550 error = devname_backstore_lookup(ddv, nm, &vp); 1551 if (error) 1552 continue; 1553 1554 vattr.va_mask = AT_MODE|AT_UID|AT_GID; 1555 error = VOP_GETATTR(vp, &vattr, 0, cred); 1556 if (error) 1557 continue; 1558 1559 if (vattr.va_type == VLNK) { 1560 error = sdev_getlink(vp, &link); 1561 if (error) { 1562 continue; 1563 } 1564 ASSERT(link != NULL); 1565 } 1566 1567 if (!rw_tryupgrade(&ddv->sdev_contents)) { 1568 rw_exit(&ddv->sdev_contents); 1569 rw_enter(&ddv->sdev_contents, RW_WRITER); 1570 } 1571 error = sdev_mknode(ddv, nm, &dv, &vattr, vp, link, 1572 cred, SDEV_READY); 1573 rw_downgrade(&ddv->sdev_contents); 1574 1575 if (link != NULL) { 1576 kmem_free(link, strlen(link) + 1); 1577 link = NULL; 1578 } 1579 1580 if (!error) { 1581 ASSERT(dv); 1582 ASSERT(dv->sdev_state != SDEV_ZOMBIE); 1583 SDEV_SIMPLE_RELE(dv); 1584 } 1585 vp = NULL; 1586 dv = NULL; 1587 } 1588 } 1589 1590 done: 1591 VN_RELE(dirvp); 1592 kmem_free(dbuf, dlen); 1593 1594 return (error); 1595 } 1596 1597 void 1598 sdev_filldir_dynamic(struct sdev_node *ddv) 1599 { 1600 int error; 1601 int i; 1602 struct vattr *vap; 1603 char *nm = NULL; 1604 struct sdev_node *dv = NULL; 1605 1606 ASSERT(RW_WRITE_HELD(&ddv->sdev_contents)); 1607 ASSERT((ddv->sdev_flags & SDEV_BUILD)); 1608 1609 vap = sdev_getdefault_attr(VDIR); 1610 for (i = 0; vtab[i].vt_name != NULL; i++) { 1611 nm = vtab[i].vt_name; 1612 ASSERT(RW_WRITE_HELD(&ddv->sdev_contents)); 1613 dv = NULL; 1614 error = sdev_mknode(ddv, nm, &dv, vap, NULL, 1615 NULL, kcred, SDEV_READY); 1616 if (error) { 1617 cmn_err(CE_WARN, "%s/%s: error %d\n", 1618 ddv->sdev_name, nm, error); 1619 } else { 1620 ASSERT(dv); 1621 ASSERT(dv->sdev_state != SDEV_ZOMBIE); 1622 SDEV_SIMPLE_RELE(dv); 1623 } 1624 } 1625 } 1626 1627 /* 1628 * Creating a backing store entry based on sdev_attr. 1629 * This is called either as part of node creation in a persistent directory 1630 * or from setattr/setsecattr to persist access attributes across reboot. 1631 */ 1632 int 1633 sdev_shadow_node(struct sdev_node *dv, struct cred *cred) 1634 { 1635 int error = 0; 1636 struct vnode *dvp = SDEVTOV(dv->sdev_dotdot); 1637 struct vnode *rdvp = VTOSDEV(dvp)->sdev_attrvp; 1638 struct vattr *vap = dv->sdev_attr; 1639 char *nm = dv->sdev_name; 1640 struct vnode *tmpvp, **rvp = &tmpvp, *rrvp = NULL; 1641 1642 ASSERT(dv && dv->sdev_name && rdvp); 1643 ASSERT(RW_WRITE_HELD(&dv->sdev_contents) && dv->sdev_attrvp == NULL); 1644 1645 lookup: 1646 /* try to find it in the backing store */ 1647 error = VOP_LOOKUP(rdvp, nm, rvp, NULL, 0, NULL, cred); 1648 if (error == 0) { 1649 if (VOP_REALVP(*rvp, &rrvp) == 0) { 1650 VN_HOLD(rrvp); 1651 VN_RELE(*rvp); 1652 *rvp = rrvp; 1653 } 1654 1655 kmem_free(dv->sdev_attr, sizeof (vattr_t)); 1656 dv->sdev_attr = NULL; 1657 dv->sdev_attrvp = *rvp; 1658 return (0); 1659 } 1660 1661 /* let's try to persist the node */ 1662 gethrestime(&vap->va_atime); 1663 vap->va_mtime = vap->va_atime; 1664 vap->va_ctime = vap->va_atime; 1665 vap->va_mask |= AT_TYPE|AT_MODE; 1666 switch (vap->va_type) { 1667 case VDIR: 1668 error = VOP_MKDIR(rdvp, nm, vap, rvp, cred); 1669 sdcmn_err9(("sdev_shadow_node: mkdir vp %p error %d\n", 1670 (void *)(*rvp), error)); 1671 break; 1672 case VCHR: 1673 case VBLK: 1674 case VREG: 1675 case VDOOR: 1676 error = VOP_CREATE(rdvp, nm, vap, NONEXCL, VREAD|VWRITE, 1677 rvp, cred, 0); 1678 sdcmn_err9(("sdev_shadow_node: create vp %p, error %d\n", 1679 (void *)(*rvp), error)); 1680 if (!error) 1681 VN_RELE(*rvp); 1682 break; 1683 case VLNK: 1684 ASSERT(dv->sdev_symlink); 1685 error = VOP_SYMLINK(rdvp, nm, vap, dv->sdev_symlink, cred); 1686 sdcmn_err9(("sdev_shadow_node: create symlink error %d\n", 1687 error)); 1688 break; 1689 default: 1690 cmn_err(CE_PANIC, "dev: %s: sdev_shadow_node " 1691 "create\n", nm); 1692 /*NOTREACHED*/ 1693 } 1694 1695 /* go back to lookup to factor out spec node and set attrvp */ 1696 if (error == 0) 1697 goto lookup; 1698 1699 return (error); 1700 } 1701 1702 static int 1703 sdev_cache_add(struct sdev_node *ddv, struct sdev_node **dv, char *nm) 1704 { 1705 int error = 0; 1706 struct sdev_node *dup = NULL; 1707 1708 ASSERT(RW_WRITE_HELD(&ddv->sdev_contents)); 1709 if ((dup = sdev_findbyname(ddv, nm)) == NULL) { 1710 sdev_direnter(ddv, *dv); 1711 } else { 1712 if (dup->sdev_state == SDEV_ZOMBIE) { 1713 error = sdev_dirdelete(ddv, dup); 1714 /* 1715 * The ZOMBIE node is still hanging 1716 * around with more than one reference counts. 1717 * Fail the new node creation so that 1718 * the directory cache won't have 1719 * duplicate entries for the same named node 1720 */ 1721 if (error == EBUSY) { 1722 SDEV_SIMPLE_RELE(*dv); 1723 sdev_nodedestroy(*dv, 0); 1724 *dv = NULL; 1725 return (error); 1726 } 1727 sdev_direnter(ddv, *dv); 1728 } else { 1729 ASSERT((*dv)->sdev_state != SDEV_ZOMBIE); 1730 SDEV_SIMPLE_RELE(*dv); 1731 sdev_nodedestroy(*dv, 0); 1732 *dv = dup; 1733 } 1734 } 1735 1736 return (0); 1737 } 1738 1739 static int 1740 sdev_cache_delete(struct sdev_node *ddv, struct sdev_node **dv) 1741 { 1742 ASSERT(RW_WRITE_HELD(&ddv->sdev_contents)); 1743 return (sdev_dirdelete(ddv, *dv)); 1744 } 1745 1746 /* 1747 * update the in-core directory cache 1748 */ 1749 int 1750 sdev_cache_update(struct sdev_node *ddv, struct sdev_node **dv, char *nm, 1751 sdev_cache_ops_t ops) 1752 { 1753 int error = 0; 1754 1755 ASSERT((SDEV_HELD(*dv))); 1756 1757 ASSERT(RW_WRITE_HELD(&ddv->sdev_contents)); 1758 switch (ops) { 1759 case SDEV_CACHE_ADD: 1760 error = sdev_cache_add(ddv, dv, nm); 1761 break; 1762 case SDEV_CACHE_DELETE: 1763 error = sdev_cache_delete(ddv, dv); 1764 break; 1765 default: 1766 break; 1767 } 1768 1769 return (error); 1770 } 1771 1772 /* 1773 * retrive the named entry from the directory cache 1774 */ 1775 struct sdev_node * 1776 sdev_cache_lookup(struct sdev_node *ddv, char *nm) 1777 { 1778 struct sdev_node *dv = NULL; 1779 1780 ASSERT(RW_LOCK_HELD(&ddv->sdev_contents)); 1781 dv = sdev_findbyname(ddv, nm); 1782 1783 return (dv); 1784 } 1785 1786 /* 1787 * Implicit reconfig for nodes constructed by a link generator 1788 * Start devfsadm if needed, or if devfsadm is in progress, 1789 * prepare to block on devfsadm either completing or 1790 * constructing the desired node. As devfsadmd is global 1791 * in scope, constructing all necessary nodes, we only 1792 * need to initiate it once. 1793 */ 1794 static int 1795 sdev_call_devfsadmd(struct sdev_node *ddv, struct sdev_node *dv, char *nm) 1796 { 1797 int error = 0; 1798 1799 if (DEVNAME_DEVFSADM_IS_RUNNING(devfsadm_state)) { 1800 sdcmn_err6(("lookup: waiting for %s/%s, 0x%x\n", 1801 ddv->sdev_name, nm, devfsadm_state)); 1802 mutex_enter(&dv->sdev_lookup_lock); 1803 SDEV_BLOCK_OTHERS(dv, (SDEV_LOOKUP | SDEV_LGWAITING)); 1804 mutex_exit(&dv->sdev_lookup_lock); 1805 error = 0; 1806 } else if (!DEVNAME_DEVFSADM_HAS_RUN(devfsadm_state)) { 1807 sdcmn_err6(("lookup %s/%s starting devfsadm, 0x%x\n", 1808 ddv->sdev_name, nm, devfsadm_state)); 1809 1810 sdev_devfsadmd_thread(ddv, dv, kcred); 1811 mutex_enter(&dv->sdev_lookup_lock); 1812 SDEV_BLOCK_OTHERS(dv, 1813 (SDEV_LOOKUP | SDEV_LGWAITING)); 1814 mutex_exit(&dv->sdev_lookup_lock); 1815 error = 0; 1816 } else { 1817 error = -1; 1818 } 1819 1820 return (error); 1821 } 1822 1823 static int 1824 sdev_call_modulelookup(struct sdev_node *ddv, struct sdev_node **dvp, char *nm, 1825 int (*fn)(char *, devname_handle_t *, struct cred *), struct cred *cred) 1826 { 1827 struct vnode *rvp = NULL; 1828 int error = 0; 1829 struct vattr *vap; 1830 devname_spec_t spec; 1831 devname_handle_t *hdl; 1832 void *args = NULL; 1833 struct sdev_node *dv = *dvp; 1834 1835 ASSERT(dv && ddv); 1836 hdl = &(dv->sdev_handle); 1837 ASSERT(hdl->dh_data == dv); 1838 mutex_enter(&dv->sdev_lookup_lock); 1839 SDEV_BLOCK_OTHERS(dv, SDEV_LOOKUP); 1840 mutex_exit(&dv->sdev_lookup_lock); 1841 error = (*fn)(nm, hdl, cred); 1842 if (error) { 1843 return (error); 1844 } 1845 1846 spec = hdl->dh_spec; 1847 args = hdl->dh_args; 1848 ASSERT(args); 1849 1850 switch (spec) { 1851 case DEVNAME_NS_PATH: 1852 /* 1853 * symlink of: 1854 * /dev/dir/nm -> /device/... 1855 */ 1856 rvp = devname_configure_by_path((char *)args, NULL); 1857 break; 1858 case DEVNAME_NS_DEV: 1859 /* 1860 * symlink of: 1861 * /dev/dir/nm -> /dev/... 1862 */ 1863 rvp = devname_find_by_devpath((char *)args, NULL); 1864 break; 1865 default: 1866 if (args) 1867 kmem_free((char *)args, strlen(args) + 1); 1868 return (ENOENT); 1869 1870 } 1871 1872 if (rvp == NULL) { 1873 if (args) 1874 kmem_free((char *)args, strlen(args) + 1); 1875 return (ENOENT); 1876 } else { 1877 vap = sdev_getdefault_attr(VLNK); 1878 ASSERT(RW_READ_HELD(&ddv->sdev_contents)); 1879 /* 1880 * Could sdev_mknode return a different dv_node 1881 * once the lock is dropped? 1882 */ 1883 if (!rw_tryupgrade(&ddv->sdev_contents)) { 1884 rw_exit(&ddv->sdev_contents); 1885 rw_enter(&ddv->sdev_contents, RW_WRITER); 1886 } 1887 error = sdev_mknode(ddv, nm, &dv, vap, NULL, args, cred, 1888 SDEV_READY); 1889 rw_downgrade(&ddv->sdev_contents); 1890 if (error) { 1891 if (args) 1892 kmem_free((char *)args, strlen(args) + 1); 1893 return (error); 1894 } else { 1895 mutex_enter(&dv->sdev_lookup_lock); 1896 SDEV_UNBLOCK_OTHERS(dv, SDEV_LOOKUP); 1897 mutex_exit(&dv->sdev_lookup_lock); 1898 error = 0; 1899 } 1900 } 1901 1902 if (args) 1903 kmem_free((char *)args, strlen(args) + 1); 1904 1905 *dvp = dv; 1906 return (0); 1907 } 1908 1909 /* 1910 * Support for specialized device naming construction mechanisms 1911 */ 1912 static int 1913 sdev_call_dircallback(struct sdev_node *ddv, struct sdev_node **dvp, char *nm, 1914 int (*callback)(struct sdev_node *, char *, void **, struct cred *, 1915 void *, char *), int flags, struct cred *cred) 1916 { 1917 int rv = 0; 1918 char *physpath = NULL; 1919 struct vnode *rvp = NULL; 1920 struct vattr vattr; 1921 struct vattr *vap; 1922 struct sdev_node *dv = *dvp; 1923 1924 mutex_enter(&dv->sdev_lookup_lock); 1925 SDEV_BLOCK_OTHERS(dv, SDEV_LOOKUP); 1926 mutex_exit(&dv->sdev_lookup_lock); 1927 1928 /* for non-devfsadm devices */ 1929 if (flags & SDEV_PATH) { 1930 physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 1931 rv = callback(ddv, nm, (void *)&physpath, kcred, NULL, 1932 NULL); 1933 if (rv) { 1934 kmem_free(physpath, MAXPATHLEN); 1935 return (-1); 1936 } 1937 1938 ASSERT(physpath); 1939 rvp = devname_configure_by_path(physpath, NULL); 1940 if (rvp == NULL) { 1941 sdcmn_err3(("devname_configure_by_path: " 1942 "failed for /dev/%s/%s\n", 1943 ddv->sdev_name, nm)); 1944 kmem_free(physpath, MAXPATHLEN); 1945 rv = -1; 1946 } else { 1947 vap = sdev_getdefault_attr(VLNK); 1948 ASSERT(RW_READ_HELD(&ddv->sdev_contents)); 1949 1950 /* 1951 * Sdev_mknode may return back a different sdev_node 1952 * that was created by another thread that 1953 * raced to the directroy cache before this thread. 1954 * 1955 * With current directory cache mechanism 1956 * (linked list with the sdev_node name as 1957 * the entity key), this is a way to make sure 1958 * only one entry exists for the same name 1959 * in the same directory. The outcome is 1960 * the winner wins. 1961 */ 1962 if (!rw_tryupgrade(&ddv->sdev_contents)) { 1963 rw_exit(&ddv->sdev_contents); 1964 rw_enter(&ddv->sdev_contents, RW_WRITER); 1965 } 1966 rv = sdev_mknode(ddv, nm, &dv, vap, NULL, 1967 (void *)physpath, cred, SDEV_READY); 1968 rw_downgrade(&ddv->sdev_contents); 1969 kmem_free(physpath, MAXPATHLEN); 1970 if (rv) { 1971 return (rv); 1972 } else { 1973 mutex_enter(&dv->sdev_lookup_lock); 1974 SDEV_UNBLOCK_OTHERS(dv, SDEV_LOOKUP); 1975 mutex_exit(&dv->sdev_lookup_lock); 1976 return (0); 1977 } 1978 } 1979 } else if (flags & SDEV_VNODE) { 1980 /* 1981 * DBNR has its own way to create the device 1982 * and return a backing store vnode in rvp 1983 */ 1984 ASSERT(callback); 1985 rv = callback(ddv, nm, (void *)&rvp, kcred, NULL, NULL); 1986 if (rv || (rvp == NULL)) { 1987 sdcmn_err3(("devname_lookup_func: SDEV_VNODE " 1988 "callback failed \n")); 1989 return (-1); 1990 } 1991 vap = sdev_getdefault_attr(rvp->v_type); 1992 if (vap == NULL) 1993 return (-1); 1994 1995 ASSERT(RW_READ_HELD(&ddv->sdev_contents)); 1996 if (!rw_tryupgrade(&ddv->sdev_contents)) { 1997 rw_exit(&ddv->sdev_contents); 1998 rw_enter(&ddv->sdev_contents, RW_WRITER); 1999 } 2000 rv = sdev_mknode(ddv, nm, &dv, vap, rvp, NULL, 2001 cred, SDEV_READY); 2002 rw_downgrade(&ddv->sdev_contents); 2003 if (rv) 2004 return (rv); 2005 2006 mutex_enter(&dv->sdev_lookup_lock); 2007 SDEV_UNBLOCK_OTHERS(dv, SDEV_LOOKUP); 2008 mutex_exit(&dv->sdev_lookup_lock); 2009 return (0); 2010 } else if (flags & SDEV_VATTR) { 2011 /* 2012 * /dev/pts 2013 * 2014 * DBNR has its own way to create the device 2015 * "0" is returned upon success. 2016 * 2017 * callback is responsible to set the basic attributes, 2018 * e.g. va_type/va_uid/va_gid/ 2019 * dev_t if VCHR or VBLK/ 2020 */ 2021 ASSERT(callback); 2022 rv = callback(ddv, nm, (void *)&vattr, kcred, NULL, NULL); 2023 if (rv) { 2024 sdcmn_err3(("devname_lookup_func: SDEV_NONE " 2025 "callback failed \n")); 2026 return (-1); 2027 } 2028 2029 ASSERT(RW_READ_HELD(&ddv->sdev_contents)); 2030 if (!rw_tryupgrade(&ddv->sdev_contents)) { 2031 rw_exit(&ddv->sdev_contents); 2032 rw_enter(&ddv->sdev_contents, RW_WRITER); 2033 } 2034 rv = sdev_mknode(ddv, nm, &dv, &vattr, NULL, NULL, 2035 cred, SDEV_READY); 2036 rw_downgrade(&ddv->sdev_contents); 2037 2038 if (rv) 2039 return (rv); 2040 2041 mutex_enter(&dv->sdev_lookup_lock); 2042 SDEV_UNBLOCK_OTHERS(dv, SDEV_LOOKUP); 2043 mutex_exit(&dv->sdev_lookup_lock); 2044 return (0); 2045 } else { 2046 impossible(("lookup: %s/%s by %s not supported (%d)\n", 2047 SDEVTOV(ddv)->v_path, nm, curproc->p_user.u_comm, 2048 __LINE__)); 2049 rv = -1; 2050 } 2051 2052 *dvp = dv; 2053 return (rv); 2054 } 2055 2056 static int 2057 is_devfsadm_thread(char *exec_name) 2058 { 2059 /* 2060 * note: because devfsadmd -> /usr/sbin/devfsadm 2061 * it is safe to use "devfsadm" to capture the lookups 2062 * from devfsadm and its daemon version. 2063 */ 2064 if (strcmp(exec_name, "devfsadm") == 0) 2065 return (1); 2066 return (0); 2067 } 2068 2069 2070 /* 2071 * Lookup Order: 2072 * sdev_node cache; 2073 * backing store (SDEV_PERSIST); 2074 * DBNR: a. dir_ops implemented in the loadable modules; 2075 * b. vnode ops in vtab. 2076 */ 2077 int 2078 devname_lookup_func(struct sdev_node *ddv, char *nm, struct vnode **vpp, 2079 struct cred *cred, int (*callback)(struct sdev_node *, char *, void **, 2080 struct cred *, void *, char *), int flags) 2081 { 2082 int rv = 0, nmlen; 2083 struct vnode *rvp = NULL; 2084 struct sdev_node *dv = NULL; 2085 int retried = 0; 2086 int error = 0; 2087 struct devname_nsmap *map = NULL; 2088 struct devname_ops *dirops = NULL; 2089 int (*fn)(char *, devname_handle_t *, struct cred *) = NULL; 2090 struct vattr vattr; 2091 char *lookup_thread = curproc->p_user.u_comm; 2092 int failed_flags = 0; 2093 int (*vtor)(struct sdev_node *) = NULL; 2094 int state; 2095 int parent_state; 2096 char *link = NULL; 2097 2098 if (SDEVTOV(ddv)->v_type != VDIR) 2099 return (ENOTDIR); 2100 2101 /* 2102 * Empty name or ., return node itself. 2103 */ 2104 nmlen = strlen(nm); 2105 if ((nmlen == 0) || ((nmlen == 1) && (nm[0] == '.'))) { 2106 *vpp = SDEVTOV(ddv); 2107 VN_HOLD(*vpp); 2108 return (0); 2109 } 2110 2111 /* 2112 * .., return the parent directory 2113 */ 2114 if ((nmlen == 2) && (strcmp(nm, "..") == 0)) { 2115 *vpp = SDEVTOV(ddv->sdev_dotdot); 2116 VN_HOLD(*vpp); 2117 return (0); 2118 } 2119 2120 rw_enter(&ddv->sdev_contents, RW_READER); 2121 if (ddv->sdev_flags & SDEV_VTOR) { 2122 vtor = (int (*)(struct sdev_node *))sdev_get_vtor(ddv); 2123 ASSERT(vtor); 2124 } 2125 2126 tryagain: 2127 /* 2128 * (a) directory cache lookup: 2129 */ 2130 ASSERT(RW_READ_HELD(&ddv->sdev_contents)); 2131 parent_state = ddv->sdev_state; 2132 dv = sdev_cache_lookup(ddv, nm); 2133 if (dv) { 2134 state = dv->sdev_state; 2135 switch (state) { 2136 case SDEV_INIT: 2137 if (is_devfsadm_thread(lookup_thread)) 2138 break; 2139 2140 /* ZOMBIED parent won't allow node creation */ 2141 if (parent_state == SDEV_ZOMBIE) { 2142 SD_TRACE_FAILED_LOOKUP(ddv, nm, 2143 retried); 2144 goto nolock_notfound; 2145 } 2146 2147 mutex_enter(&dv->sdev_lookup_lock); 2148 /* compensate the threads started after devfsadm */ 2149 if (DEVNAME_DEVFSADM_IS_RUNNING(devfsadm_state) && 2150 !(SDEV_IS_LOOKUP(dv))) 2151 SDEV_BLOCK_OTHERS(dv, 2152 (SDEV_LOOKUP | SDEV_LGWAITING)); 2153 2154 if (SDEV_IS_LOOKUP(dv)) { 2155 failed_flags |= SLF_REBUILT; 2156 rw_exit(&ddv->sdev_contents); 2157 error = sdev_wait4lookup(dv, SDEV_LOOKUP); 2158 mutex_exit(&dv->sdev_lookup_lock); 2159 rw_enter(&ddv->sdev_contents, RW_READER); 2160 2161 if (error != 0) { 2162 SD_TRACE_FAILED_LOOKUP(ddv, nm, 2163 retried); 2164 goto nolock_notfound; 2165 } 2166 2167 state = dv->sdev_state; 2168 if (state == SDEV_INIT) { 2169 SD_TRACE_FAILED_LOOKUP(ddv, nm, 2170 retried); 2171 goto nolock_notfound; 2172 } else if (state == SDEV_READY) { 2173 goto found; 2174 } else if (state == SDEV_ZOMBIE) { 2175 rw_exit(&ddv->sdev_contents); 2176 SD_TRACE_FAILED_LOOKUP(ddv, nm, 2177 retried); 2178 SDEV_RELE(dv); 2179 goto lookup_failed; 2180 } 2181 } else { 2182 mutex_exit(&dv->sdev_lookup_lock); 2183 } 2184 break; 2185 case SDEV_READY: 2186 goto found; 2187 case SDEV_ZOMBIE: 2188 rw_exit(&ddv->sdev_contents); 2189 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2190 SDEV_RELE(dv); 2191 goto lookup_failed; 2192 default: 2193 rw_exit(&ddv->sdev_contents); 2194 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2195 sdev_lookup_failed(ddv, nm, failed_flags); 2196 *vpp = NULLVP; 2197 return (ENOENT); 2198 } 2199 } 2200 ASSERT(RW_READ_HELD(&ddv->sdev_contents)); 2201 2202 /* 2203 * ZOMBIED parent does not allow new node creation. 2204 * bail out early 2205 */ 2206 if (parent_state == SDEV_ZOMBIE) { 2207 rw_exit(&ddv->sdev_contents); 2208 *vpp = NULL; 2209 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2210 return (ENOENT); 2211 } 2212 2213 /* 2214 * (b0): backing store lookup 2215 * SDEV_PERSIST is default except: 2216 * 1) pts nodes 2217 * 2) non-chmod'ed local nodes 2218 */ 2219 if (SDEV_IS_PERSIST(ddv)) { 2220 error = devname_backstore_lookup(ddv, nm, &rvp); 2221 2222 if (!error) { 2223 sdcmn_err3(("devname_backstore_lookup: " 2224 "found attrvp %p for %s\n", (void *)rvp, nm)); 2225 2226 vattr.va_mask = AT_MODE|AT_UID|AT_GID; 2227 error = VOP_GETATTR(rvp, &vattr, 0, cred); 2228 if (error) { 2229 rw_exit(&ddv->sdev_contents); 2230 if (dv) 2231 SDEV_RELE(dv); 2232 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2233 sdev_lookup_failed(ddv, nm, failed_flags); 2234 *vpp = NULLVP; 2235 return (ENOENT); 2236 } 2237 2238 if (vattr.va_type == VLNK) { 2239 error = sdev_getlink(rvp, &link); 2240 if (error) { 2241 rw_exit(&ddv->sdev_contents); 2242 if (dv) 2243 SDEV_RELE(dv); 2244 SD_TRACE_FAILED_LOOKUP(ddv, nm, 2245 retried); 2246 sdev_lookup_failed(ddv, nm, 2247 failed_flags); 2248 *vpp = NULLVP; 2249 return (ENOENT); 2250 } 2251 ASSERT(link != NULL); 2252 } 2253 2254 if (!rw_tryupgrade(&ddv->sdev_contents)) { 2255 rw_exit(&ddv->sdev_contents); 2256 rw_enter(&ddv->sdev_contents, RW_WRITER); 2257 } 2258 error = sdev_mknode(ddv, nm, &dv, &vattr, 2259 rvp, link, cred, SDEV_READY); 2260 rw_downgrade(&ddv->sdev_contents); 2261 2262 if (link != NULL) { 2263 kmem_free(link, strlen(link) + 1); 2264 link = NULL; 2265 } 2266 2267 if (error) { 2268 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2269 rw_exit(&ddv->sdev_contents); 2270 if (dv) 2271 SDEV_RELE(dv); 2272 goto lookup_failed; 2273 } else { 2274 goto found; 2275 } 2276 } else if (retried) { 2277 rw_exit(&ddv->sdev_contents); 2278 sdcmn_err3(("retry of lookup of %s/%s: failed\n", 2279 ddv->sdev_name, nm)); 2280 if (dv) 2281 SDEV_RELE(dv); 2282 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2283 sdev_lookup_failed(ddv, nm, failed_flags); 2284 *vpp = NULLVP; 2285 return (ENOENT); 2286 } 2287 } 2288 2289 2290 /* first thread that is doing the lookup on this node */ 2291 if (!dv) { 2292 if (!rw_tryupgrade(&ddv->sdev_contents)) { 2293 rw_exit(&ddv->sdev_contents); 2294 rw_enter(&ddv->sdev_contents, RW_WRITER); 2295 } 2296 error = sdev_mknode(ddv, nm, &dv, NULL, NULL, NULL, 2297 cred, SDEV_INIT); 2298 if (!dv) { 2299 rw_exit(&ddv->sdev_contents); 2300 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2301 sdev_lookup_failed(ddv, nm, failed_flags); 2302 *vpp = NULLVP; 2303 return (ENOENT); 2304 } 2305 rw_downgrade(&ddv->sdev_contents); 2306 } 2307 ASSERT(dv); 2308 ASSERT(SDEV_HELD(dv)); 2309 2310 if (SDEV_IS_NO_NCACHE(dv)) { 2311 failed_flags |= SLF_NO_NCACHE; 2312 } 2313 2314 if (SDEV_IS_GLOBAL(ddv)) { 2315 map = sdev_get_map(ddv, 1); 2316 dirops = map ? map->dir_ops : NULL; 2317 fn = dirops ? dirops->devnops_lookup : NULL; 2318 } 2319 2320 /* 2321 * (b1) invoking devfsadm once per life time for devfsadm nodes 2322 */ 2323 if ((fn == NULL) && !callback) { 2324 2325 if (sdev_reconfig_boot || !i_ddi_io_initialized() || 2326 SDEV_IS_DYNAMIC(ddv) || SDEV_IS_NO_NCACHE(dv) || 2327 ((moddebug & MODDEBUG_FINI_EBUSY) != 0)) { 2328 ASSERT(SDEV_HELD(dv)); 2329 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2330 goto nolock_notfound; 2331 } 2332 2333 /* 2334 * filter out known non-existent devices recorded 2335 * during initial reconfiguration boot for which 2336 * reconfig should not be done and lookup may 2337 * be short-circuited now. 2338 */ 2339 if (sdev_lookup_filter(ddv, nm)) { 2340 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2341 goto nolock_notfound; 2342 } 2343 2344 /* bypassing devfsadm internal nodes */ 2345 if (is_devfsadm_thread(lookup_thread)) { 2346 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2347 goto nolock_notfound; 2348 } 2349 2350 if (sdev_reconfig_disable) { 2351 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2352 goto nolock_notfound; 2353 } 2354 2355 error = sdev_call_devfsadmd(ddv, dv, nm); 2356 if (error == 0) { 2357 sdcmn_err8(("lookup of %s/%s by %s: reconfig\n", 2358 ddv->sdev_name, nm, curproc->p_user.u_comm)); 2359 if (sdev_reconfig_verbose) { 2360 cmn_err(CE_CONT, 2361 "?lookup of %s/%s by %s: reconfig\n", 2362 ddv->sdev_name, nm, curproc->p_user.u_comm); 2363 } 2364 retried = 1; 2365 failed_flags |= SLF_REBUILT; 2366 ASSERT(dv->sdev_state != SDEV_ZOMBIE); 2367 SDEV_SIMPLE_RELE(dv); 2368 goto tryagain; 2369 } else { 2370 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2371 goto nolock_notfound; 2372 } 2373 } 2374 2375 /* 2376 * (b2) Directory Based Name Resolution (DBNR): 2377 * ddv - parent 2378 * nm - /dev/(ddv->sdev_name)/nm 2379 * 2380 * note: module vnode ops take precedence than the build-in ones 2381 */ 2382 if (fn) { 2383 error = sdev_call_modulelookup(ddv, &dv, nm, fn, cred); 2384 if (error) { 2385 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2386 goto notfound; 2387 } else { 2388 goto found; 2389 } 2390 } else if (callback) { 2391 error = sdev_call_dircallback(ddv, &dv, nm, callback, 2392 flags, cred); 2393 if (error == 0) { 2394 goto found; 2395 } else { 2396 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2397 goto notfound; 2398 } 2399 } 2400 ASSERT(rvp); 2401 2402 found: 2403 ASSERT(!(dv->sdev_flags & SDEV_STALE)); 2404 ASSERT(dv->sdev_state == SDEV_READY); 2405 if (vtor) { 2406 /* 2407 * Check validity of returned node 2408 */ 2409 switch (vtor(dv)) { 2410 case SDEV_VTOR_VALID: 2411 break; 2412 case SDEV_VTOR_INVALID: 2413 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2414 sdcmn_err7(("lookup: destroy invalid " 2415 "node: %s(%p)\n", dv->sdev_name, (void *)dv)); 2416 goto nolock_notfound; 2417 case SDEV_VTOR_SKIP: 2418 sdcmn_err7(("lookup: node not applicable - " 2419 "skipping: %s(%p)\n", dv->sdev_name, (void *)dv)); 2420 rw_exit(&ddv->sdev_contents); 2421 SD_TRACE_FAILED_LOOKUP(ddv, nm, retried); 2422 SDEV_RELE(dv); 2423 goto lookup_failed; 2424 default: 2425 cmn_err(CE_PANIC, 2426 "dev fs: validator failed: %s(%p)\n", 2427 dv->sdev_name, (void *)dv); 2428 break; 2429 /*NOTREACHED*/ 2430 } 2431 } 2432 2433 if ((SDEVTOV(dv)->v_type == VDIR) && SDEV_IS_GLOBAL(dv)) { 2434 rw_enter(&dv->sdev_contents, RW_READER); 2435 (void) sdev_get_map(dv, 1); 2436 rw_exit(&dv->sdev_contents); 2437 } 2438 rw_exit(&ddv->sdev_contents); 2439 rv = sdev_to_vp(dv, vpp); 2440 sdcmn_err3(("devname_lookup_func: returning vp %p v_count %d state %d " 2441 "for nm %s, error %d\n", (void *)*vpp, (*vpp)->v_count, 2442 dv->sdev_state, nm, rv)); 2443 return (rv); 2444 2445 notfound: 2446 mutex_enter(&dv->sdev_lookup_lock); 2447 SDEV_UNBLOCK_OTHERS(dv, SDEV_LOOKUP); 2448 mutex_exit(&dv->sdev_lookup_lock); 2449 nolock_notfound: 2450 /* 2451 * Destroy the node that is created for synchronization purposes. 2452 */ 2453 sdcmn_err3(("devname_lookup_func: %s with state %d\n", 2454 nm, dv->sdev_state)); 2455 ASSERT(RW_READ_HELD(&ddv->sdev_contents)); 2456 if (dv->sdev_state == SDEV_INIT) { 2457 if (!rw_tryupgrade(&ddv->sdev_contents)) { 2458 rw_exit(&ddv->sdev_contents); 2459 rw_enter(&ddv->sdev_contents, RW_WRITER); 2460 } 2461 2462 /* 2463 * Node state may have changed during the lock 2464 * changes. Re-check. 2465 */ 2466 if (dv->sdev_state == SDEV_INIT) { 2467 (void) sdev_dirdelete(ddv, dv); 2468 rw_exit(&ddv->sdev_contents); 2469 sdev_lookup_failed(ddv, nm, failed_flags); 2470 *vpp = NULL; 2471 return (ENOENT); 2472 } 2473 } 2474 2475 rw_exit(&ddv->sdev_contents); 2476 SDEV_RELE(dv); 2477 2478 lookup_failed: 2479 sdev_lookup_failed(ddv, nm, failed_flags); 2480 *vpp = NULL; 2481 return (ENOENT); 2482 } 2483 2484 /* 2485 * Given a directory node, mark all nodes beneath as 2486 * STALE, i.e. nodes that don't exist as far as new 2487 * consumers are concerned 2488 */ 2489 void 2490 sdev_stale(struct sdev_node *ddv) 2491 { 2492 struct sdev_node *dv; 2493 struct vnode *vp; 2494 2495 ASSERT(SDEVTOV(ddv)->v_type == VDIR); 2496 2497 rw_enter(&ddv->sdev_contents, RW_WRITER); 2498 for (dv = ddv->sdev_dot; dv; dv = dv->sdev_next) { 2499 vp = SDEVTOV(dv); 2500 if (vp->v_type == VDIR) 2501 sdev_stale(dv); 2502 2503 sdcmn_err9(("sdev_stale: setting stale %s\n", 2504 dv->sdev_name)); 2505 dv->sdev_flags |= SDEV_STALE; 2506 } 2507 ddv->sdev_flags |= SDEV_BUILD; 2508 rw_exit(&ddv->sdev_contents); 2509 } 2510 2511 /* 2512 * Given a directory node, clean out all the nodes beneath. 2513 * If expr is specified, clean node with names matching expr. 2514 * If SDEV_ENFORCE is specified in flags, busy nodes are made stale, 2515 * so they are excluded from future lookups. 2516 */ 2517 int 2518 sdev_cleandir(struct sdev_node *ddv, char *expr, uint_t flags) 2519 { 2520 int error = 0; 2521 int busy = 0; 2522 struct vnode *vp; 2523 struct sdev_node *dv, *next = NULL; 2524 int bkstore = 0; 2525 int len = 0; 2526 char *bks_name = NULL; 2527 2528 ASSERT(SDEVTOV(ddv)->v_type == VDIR); 2529 2530 /* 2531 * We try our best to destroy all unused sdev_node's 2532 */ 2533 rw_enter(&ddv->sdev_contents, RW_WRITER); 2534 for (dv = ddv->sdev_dot; dv; dv = next) { 2535 next = dv->sdev_next; 2536 vp = SDEVTOV(dv); 2537 2538 if (expr && gmatch(dv->sdev_name, expr) == 0) 2539 continue; 2540 2541 if (vp->v_type == VDIR && 2542 sdev_cleandir(dv, NULL, flags) != 0) { 2543 sdcmn_err9(("sdev_cleandir: dir %s busy\n", 2544 dv->sdev_name)); 2545 busy++; 2546 continue; 2547 } 2548 2549 if (vp->v_count > 0 && (flags & SDEV_ENFORCE) == 0) { 2550 sdcmn_err9(("sdev_cleandir: dir %s busy\n", 2551 dv->sdev_name)); 2552 busy++; 2553 continue; 2554 } 2555 2556 /* 2557 * at this point, either dv is not held or SDEV_ENFORCE 2558 * is specified. In either case, dv needs to be deleted 2559 */ 2560 SDEV_HOLD(dv); 2561 2562 bkstore = SDEV_IS_PERSIST(dv) ? 1 : 0; 2563 if (bkstore && (vp->v_type == VDIR)) 2564 bkstore += 1; 2565 2566 if (bkstore) { 2567 len = strlen(dv->sdev_name) + 1; 2568 bks_name = kmem_alloc(len, KM_SLEEP); 2569 bcopy(dv->sdev_name, bks_name, len); 2570 } 2571 2572 error = sdev_dirdelete(ddv, dv); 2573 2574 if (error == EBUSY) { 2575 sdcmn_err9(("sdev_cleandir: dir busy\n")); 2576 busy++; 2577 } 2578 2579 /* take care the backing store clean up */ 2580 if (bkstore && (error == 0)) { 2581 ASSERT(bks_name); 2582 ASSERT(ddv->sdev_attrvp); 2583 2584 if (bkstore == 1) { 2585 error = VOP_REMOVE(ddv->sdev_attrvp, 2586 bks_name, kcred); 2587 } else if (bkstore == 2) { 2588 error = VOP_RMDIR(ddv->sdev_attrvp, 2589 bks_name, ddv->sdev_attrvp, kcred); 2590 } 2591 2592 /* do not propagate the backing store errors */ 2593 if (error) { 2594 sdcmn_err9(("sdev_cleandir: backing store" 2595 "not cleaned\n")); 2596 error = 0; 2597 } 2598 2599 bkstore = 0; 2600 kmem_free(bks_name, len); 2601 bks_name = NULL; 2602 len = 0; 2603 } 2604 } 2605 2606 ddv->sdev_flags |= SDEV_BUILD; 2607 rw_exit(&ddv->sdev_contents); 2608 2609 if (busy) { 2610 error = EBUSY; 2611 } 2612 2613 return (error); 2614 } 2615 2616 /* 2617 * a convenient wrapper for readdir() funcs 2618 */ 2619 size_t 2620 add_dir_entry(dirent64_t *de, char *nm, size_t size, ino_t ino, offset_t off) 2621 { 2622 size_t reclen = DIRENT64_RECLEN(strlen(nm)); 2623 if (reclen > size) 2624 return (0); 2625 2626 de->d_ino = (ino64_t)ino; 2627 de->d_off = (off64_t)off + 1; 2628 de->d_reclen = (ushort_t)reclen; 2629 (void) strncpy(de->d_name, nm, DIRENT64_NAMELEN(reclen)); 2630 return (reclen); 2631 } 2632 2633 /* 2634 * sdev_mount service routines 2635 */ 2636 int 2637 sdev_copyin_mountargs(struct mounta *uap, struct sdev_mountargs *args) 2638 { 2639 int error; 2640 2641 if (uap->datalen != sizeof (*args)) 2642 return (EINVAL); 2643 2644 if (error = copyin(uap->dataptr, args, sizeof (*args))) { 2645 cmn_err(CE_WARN, "sdev_copyin_mountargs: can not" 2646 "get user data. error %d\n", error); 2647 return (EFAULT); 2648 } 2649 2650 return (0); 2651 } 2652 2653 #ifdef nextdp 2654 #undef nextdp 2655 #endif 2656 #define nextdp(dp) ((struct dirent64 *) \ 2657 (intptr_t)((char *)(dp) + (dp)->d_reclen)) 2658 2659 /* 2660 * readdir helper func 2661 */ 2662 int 2663 devname_readdir_func(vnode_t *vp, uio_t *uiop, cred_t *cred, int *eofp, 2664 int flags) 2665 { 2666 struct sdev_node *ddv = VTOSDEV(vp); 2667 struct sdev_node *dv; 2668 dirent64_t *dp; 2669 ulong_t outcount = 0; 2670 size_t namelen; 2671 ulong_t alloc_count; 2672 void *outbuf; 2673 struct iovec *iovp; 2674 int error = 0; 2675 size_t reclen; 2676 offset_t diroff; 2677 offset_t soff; 2678 int this_reclen; 2679 struct devname_nsmap *map = NULL; 2680 struct devname_ops *dirops = NULL; 2681 int (*fn)(devname_handle_t *, struct cred *) = NULL; 2682 int (*vtor)(struct sdev_node *) = NULL; 2683 struct vattr attr; 2684 timestruc_t now; 2685 2686 ASSERT(ddv->sdev_attr || ddv->sdev_attrvp); 2687 ASSERT(RW_READ_HELD(&ddv->sdev_contents)); 2688 2689 if (uiop->uio_loffset >= MAXOFF_T) { 2690 if (eofp) 2691 *eofp = 1; 2692 return (0); 2693 } 2694 2695 if (uiop->uio_iovcnt != 1) 2696 return (EINVAL); 2697 2698 if (vp->v_type != VDIR) 2699 return (ENOTDIR); 2700 2701 if (ddv->sdev_flags & SDEV_VTOR) { 2702 vtor = (int (*)(struct sdev_node *))sdev_get_vtor(ddv); 2703 ASSERT(vtor); 2704 } 2705 2706 if (eofp != NULL) 2707 *eofp = 0; 2708 2709 soff = uiop->uio_loffset; 2710 iovp = uiop->uio_iov; 2711 alloc_count = iovp->iov_len; 2712 dp = outbuf = kmem_alloc(alloc_count, KM_SLEEP); 2713 outcount = 0; 2714 2715 if (ddv->sdev_state == SDEV_ZOMBIE) 2716 goto get_cache; 2717 2718 if (SDEV_IS_GLOBAL(ddv)) { 2719 map = sdev_get_map(ddv, 0); 2720 dirops = map ? map->dir_ops : NULL; 2721 fn = dirops ? dirops->devnops_readdir : NULL; 2722 2723 if (map && map->dir_map) { 2724 /* 2725 * load the name mapping rule database 2726 * through invoking devfsadm and symlink 2727 * all the entries in the map 2728 */ 2729 devname_rdr_result_t rdr_result; 2730 int do_thread = 0; 2731 2732 rw_enter(&map->dir_lock, RW_READER); 2733 do_thread = map->dir_maploaded ? 0 : 1; 2734 rw_exit(&map->dir_lock); 2735 2736 if (do_thread) { 2737 mutex_enter(&ddv->sdev_lookup_lock); 2738 SDEV_BLOCK_OTHERS(ddv, SDEV_READDIR); 2739 mutex_exit(&ddv->sdev_lookup_lock); 2740 2741 sdev_dispatch_to_nsrdr_thread(ddv, 2742 map->dir_map, &rdr_result); 2743 } 2744 } else if ((sdev_boot_state == SDEV_BOOT_STATE_COMPLETE) && 2745 !sdev_reconfig_boot && (flags & SDEV_BROWSE) && 2746 !SDEV_IS_DYNAMIC(ddv) && !SDEV_IS_NO_NCACHE(ddv) && 2747 ((moddebug & MODDEBUG_FINI_EBUSY) == 0) && 2748 !DEVNAME_DEVFSADM_HAS_RUN(devfsadm_state) && 2749 !DEVNAME_DEVFSADM_IS_RUNNING(devfsadm_state) && 2750 !sdev_reconfig_disable) { 2751 /* 2752 * invoking "devfsadm" to do system device reconfig 2753 */ 2754 mutex_enter(&ddv->sdev_lookup_lock); 2755 SDEV_BLOCK_OTHERS(ddv, 2756 (SDEV_READDIR|SDEV_LGWAITING)); 2757 mutex_exit(&ddv->sdev_lookup_lock); 2758 2759 sdcmn_err8(("readdir of %s by %s: reconfig\n", 2760 ddv->sdev_path, curproc->p_user.u_comm)); 2761 if (sdev_reconfig_verbose) { 2762 cmn_err(CE_CONT, 2763 "?readdir of %s by %s: reconfig\n", 2764 ddv->sdev_path, curproc->p_user.u_comm); 2765 } 2766 2767 sdev_devfsadmd_thread(ddv, NULL, kcred); 2768 } else if (DEVNAME_DEVFSADM_IS_RUNNING(devfsadm_state)) { 2769 /* 2770 * compensate the "ls" started later than "devfsadm" 2771 */ 2772 mutex_enter(&ddv->sdev_lookup_lock); 2773 SDEV_BLOCK_OTHERS(ddv, (SDEV_READDIR|SDEV_LGWAITING)); 2774 mutex_exit(&ddv->sdev_lookup_lock); 2775 } 2776 2777 /* 2778 * release the contents lock so that 2779 * the cache may be updated by devfsadmd 2780 */ 2781 rw_exit(&ddv->sdev_contents); 2782 mutex_enter(&ddv->sdev_lookup_lock); 2783 if (SDEV_IS_READDIR(ddv)) 2784 (void) sdev_wait4lookup(ddv, SDEV_READDIR); 2785 mutex_exit(&ddv->sdev_lookup_lock); 2786 rw_enter(&ddv->sdev_contents, RW_READER); 2787 2788 sdcmn_err4(("readdir of directory %s by %s\n", 2789 ddv->sdev_name, curproc->p_user.u_comm)); 2790 if (ddv->sdev_flags & SDEV_BUILD) { 2791 if (SDEV_IS_PERSIST(ddv)) { 2792 error = sdev_filldir_from_store(ddv, 2793 alloc_count, cred); 2794 } 2795 ddv->sdev_flags &= ~SDEV_BUILD; 2796 } 2797 } 2798 2799 get_cache: 2800 /* handle "." and ".." */ 2801 diroff = 0; 2802 if (soff == 0) { 2803 /* first time */ 2804 this_reclen = DIRENT64_RECLEN(1); 2805 if (alloc_count < this_reclen) { 2806 error = EINVAL; 2807 goto done; 2808 } 2809 2810 dp->d_ino = (ino64_t)ddv->sdev_ino; 2811 dp->d_off = (off64_t)1; 2812 dp->d_reclen = (ushort_t)this_reclen; 2813 2814 (void) strncpy(dp->d_name, ".", 2815 DIRENT64_NAMELEN(this_reclen)); 2816 outcount += dp->d_reclen; 2817 dp = nextdp(dp); 2818 } 2819 2820 diroff++; 2821 if (soff <= 1) { 2822 this_reclen = DIRENT64_RECLEN(2); 2823 if (alloc_count < outcount + this_reclen) { 2824 error = EINVAL; 2825 goto done; 2826 } 2827 2828 dp->d_reclen = (ushort_t)this_reclen; 2829 dp->d_ino = (ino64_t)ddv->sdev_dotdot->sdev_ino; 2830 dp->d_off = (off64_t)2; 2831 2832 (void) strncpy(dp->d_name, "..", 2833 DIRENT64_NAMELEN(this_reclen)); 2834 outcount += dp->d_reclen; 2835 2836 dp = nextdp(dp); 2837 } 2838 2839 2840 /* gets the cache */ 2841 diroff++; 2842 for (dv = ddv->sdev_dot; dv; dv = dv->sdev_next, diroff++) { 2843 sdcmn_err3(("sdev_readdir: diroff %lld soff %lld for '%s' \n", 2844 diroff, soff, dv->sdev_name)); 2845 2846 /* bypassing pre-matured nodes */ 2847 if (diroff < soff || (dv->sdev_state != SDEV_READY)) { 2848 sdcmn_err3(("sdev_readdir: pre-mature node " 2849 "%s\n", dv->sdev_name)); 2850 continue; 2851 } 2852 2853 /* don't list stale nodes */ 2854 if (dv->sdev_flags & SDEV_STALE) { 2855 sdcmn_err4(("sdev_readdir: STALE node " 2856 "%s\n", dv->sdev_name)); 2857 continue; 2858 } 2859 2860 /* 2861 * Check validity of node 2862 */ 2863 if (vtor) { 2864 switch (vtor(dv)) { 2865 case SDEV_VTOR_VALID: 2866 break; 2867 case SDEV_VTOR_INVALID: 2868 case SDEV_VTOR_SKIP: 2869 continue; 2870 default: 2871 cmn_err(CE_PANIC, 2872 "dev fs: validator failed: %s(%p)\n", 2873 dv->sdev_name, (void *)dv); 2874 break; 2875 /*NOTREACHED*/ 2876 } 2877 } 2878 2879 /* 2880 * call back into the module for the validity/bookkeeping 2881 * of this entry 2882 */ 2883 if (fn) { 2884 error = (*fn)(&(dv->sdev_handle), cred); 2885 if (error) { 2886 sdcmn_err4(("sdev_readdir: module did not " 2887 "validate %s\n", dv->sdev_name)); 2888 continue; 2889 } 2890 } 2891 2892 namelen = strlen(dv->sdev_name); 2893 reclen = DIRENT64_RECLEN(namelen); 2894 if (outcount + reclen > alloc_count) { 2895 goto full; 2896 } 2897 dp->d_reclen = (ushort_t)reclen; 2898 dp->d_ino = (ino64_t)dv->sdev_ino; 2899 dp->d_off = (off64_t)diroff + 1; 2900 (void) strncpy(dp->d_name, dv->sdev_name, 2901 DIRENT64_NAMELEN(reclen)); 2902 outcount += reclen; 2903 dp = nextdp(dp); 2904 } 2905 2906 full: 2907 sdcmn_err4(("sdev_readdir: moving %lu bytes: " 2908 "diroff %lld, soff %lld, dv %p\n", outcount, diroff, soff, 2909 (void *)dv)); 2910 2911 if (outcount) 2912 error = uiomove(outbuf, outcount, UIO_READ, uiop); 2913 2914 if (!error) { 2915 uiop->uio_loffset = diroff; 2916 if (eofp) 2917 *eofp = dv ? 0 : 1; 2918 } 2919 2920 2921 if (ddv->sdev_attrvp) { 2922 gethrestime(&now); 2923 attr.va_ctime = now; 2924 attr.va_atime = now; 2925 attr.va_mask = AT_CTIME|AT_ATIME; 2926 2927 (void) VOP_SETATTR(ddv->sdev_attrvp, &attr, 0, kcred, NULL); 2928 } 2929 done: 2930 kmem_free(outbuf, alloc_count); 2931 return (error); 2932 } 2933 2934 2935 static int 2936 sdev_modctl_lookup(const char *path, vnode_t **r_vp) 2937 { 2938 vnode_t *vp; 2939 vnode_t *cvp; 2940 struct sdev_node *svp; 2941 char *nm; 2942 struct pathname pn; 2943 int error; 2944 int persisted = 0; 2945 2946 if (error = pn_get((char *)path, UIO_SYSSPACE, &pn)) 2947 return (error); 2948 nm = kmem_alloc(MAXNAMELEN, KM_SLEEP); 2949 2950 vp = rootdir; 2951 VN_HOLD(vp); 2952 2953 while (pn_pathleft(&pn)) { 2954 ASSERT(vp->v_type == VDIR); 2955 (void) pn_getcomponent(&pn, nm); 2956 error = VOP_LOOKUP(vp, nm, &cvp, NULL, 0, NULL, kcred); 2957 VN_RELE(vp); 2958 2959 if (error) 2960 break; 2961 2962 /* traverse mount points encountered on our journey */ 2963 if (vn_ismntpt(cvp) && (error = traverse(&cvp)) != 0) { 2964 VN_RELE(cvp); 2965 break; 2966 } 2967 2968 /* 2969 * Direct the operation to the persisting filesystem 2970 * underlying /dev. Bail if we encounter a 2971 * non-persistent dev entity here. 2972 */ 2973 if (cvp->v_vfsp->vfs_fstype == devtype) { 2974 2975 if ((VTOSDEV(cvp)->sdev_flags & SDEV_PERSIST) == 0) { 2976 error = ENOENT; 2977 VN_RELE(cvp); 2978 break; 2979 } 2980 2981 if (VTOSDEV(cvp) == NULL) { 2982 error = ENOENT; 2983 VN_RELE(cvp); 2984 break; 2985 } 2986 svp = VTOSDEV(cvp); 2987 if ((vp = svp->sdev_attrvp) == NULL) { 2988 error = ENOENT; 2989 VN_RELE(cvp); 2990 break; 2991 } 2992 persisted = 1; 2993 VN_HOLD(vp); 2994 VN_RELE(cvp); 2995 cvp = vp; 2996 } 2997 2998 vp = cvp; 2999 pn_skipslash(&pn); 3000 } 3001 3002 kmem_free(nm, MAXNAMELEN); 3003 pn_free(&pn); 3004 3005 if (error) 3006 return (error); 3007 3008 /* 3009 * Only return persisted nodes in the filesystem underlying /dev. 3010 */ 3011 if (!persisted) { 3012 VN_RELE(vp); 3013 return (ENOENT); 3014 } 3015 3016 *r_vp = vp; 3017 return (0); 3018 } 3019 3020 int 3021 sdev_modctl_readdir(const char *dir, char ***dirlistp, 3022 int *npathsp, int *npathsp_alloc) 3023 { 3024 char **pathlist = NULL; 3025 char **newlist = NULL; 3026 int npaths = 0; 3027 int npaths_alloc = 0; 3028 dirent64_t *dbuf = NULL; 3029 int n; 3030 char *s; 3031 int error; 3032 vnode_t *vp; 3033 int eof; 3034 struct iovec iov; 3035 struct uio uio; 3036 struct dirent64 *dp; 3037 size_t dlen; 3038 size_t dbuflen; 3039 int ndirents = 64; 3040 char *nm; 3041 3042 error = sdev_modctl_lookup(dir, &vp); 3043 sdcmn_err11(("modctl readdir: %s by %s: %s\n", 3044 dir, curproc->p_user.u_comm, 3045 (error == 0) ? "ok" : "failed")); 3046 if (error) 3047 return (error); 3048 3049 dlen = ndirents * (sizeof (*dbuf)); 3050 dbuf = kmem_alloc(dlen, KM_SLEEP); 3051 3052 uio.uio_iov = &iov; 3053 uio.uio_iovcnt = 1; 3054 uio.uio_segflg = UIO_SYSSPACE; 3055 uio.uio_fmode = 0; 3056 uio.uio_extflg = UIO_COPY_CACHED; 3057 uio.uio_loffset = 0; 3058 uio.uio_llimit = MAXOFFSET_T; 3059 3060 eof = 0; 3061 error = 0; 3062 while (!error && !eof) { 3063 uio.uio_resid = dlen; 3064 iov.iov_base = (char *)dbuf; 3065 iov.iov_len = dlen; 3066 3067 (void) VOP_RWLOCK(vp, V_WRITELOCK_FALSE, NULL); 3068 error = VOP_READDIR(vp, &uio, kcred, &eof); 3069 VOP_RWUNLOCK(vp, V_WRITELOCK_FALSE, NULL); 3070 3071 dbuflen = dlen - uio.uio_resid; 3072 3073 if (error || dbuflen == 0) 3074 break; 3075 3076 for (dp = dbuf; ((intptr_t)dp < (intptr_t)dbuf + dbuflen); 3077 dp = (dirent64_t *)((intptr_t)dp + dp->d_reclen)) { 3078 3079 nm = dp->d_name; 3080 3081 if (strcmp(nm, ".") == 0 || strcmp(nm, "..") == 0) 3082 continue; 3083 3084 if (npaths == npaths_alloc) { 3085 npaths_alloc += 64; 3086 newlist = (char **) 3087 kmem_zalloc((npaths_alloc + 1) * 3088 sizeof (char *), KM_SLEEP); 3089 if (pathlist) { 3090 bcopy(pathlist, newlist, 3091 npaths * sizeof (char *)); 3092 kmem_free(pathlist, 3093 (npaths + 1) * sizeof (char *)); 3094 } 3095 pathlist = newlist; 3096 } 3097 n = strlen(nm) + 1; 3098 s = kmem_alloc(n, KM_SLEEP); 3099 bcopy(nm, s, n); 3100 pathlist[npaths++] = s; 3101 sdcmn_err11((" %s/%s\n", dir, s)); 3102 } 3103 } 3104 3105 exit: 3106 VN_RELE(vp); 3107 3108 if (dbuf) 3109 kmem_free(dbuf, dlen); 3110 3111 if (error) 3112 return (error); 3113 3114 *dirlistp = pathlist; 3115 *npathsp = npaths; 3116 *npathsp_alloc = npaths_alloc; 3117 3118 return (0); 3119 } 3120 3121 void 3122 sdev_modctl_readdir_free(char **pathlist, int npaths, int npaths_alloc) 3123 { 3124 int i, n; 3125 3126 for (i = 0; i < npaths; i++) { 3127 n = strlen(pathlist[i]) + 1; 3128 kmem_free(pathlist[i], n); 3129 } 3130 3131 kmem_free(pathlist, (npaths_alloc + 1) * sizeof (char *)); 3132 } 3133 3134 int 3135 sdev_modctl_devexists(const char *path) 3136 { 3137 vnode_t *vp; 3138 int error; 3139 3140 error = sdev_modctl_lookup(path, &vp); 3141 sdcmn_err11(("modctl dev exists: %s by %s: %s\n", 3142 path, curproc->p_user.u_comm, 3143 (error == 0) ? "ok" : "failed")); 3144 if (error == 0) 3145 VN_RELE(vp); 3146 3147 return (error); 3148 } 3149 3150 void 3151 sdev_update_newnsmap(struct devname_nsmap *map, char *module, char *mapname) 3152 { 3153 rw_enter(&map->dir_lock, RW_WRITER); 3154 if (module) { 3155 ASSERT(map->dir_newmodule == NULL); 3156 map->dir_newmodule = i_ddi_strdup(module, KM_SLEEP); 3157 } 3158 if (mapname) { 3159 ASSERT(map->dir_newmap == NULL); 3160 map->dir_newmap = i_ddi_strdup(mapname, KM_SLEEP); 3161 } 3162 3163 map->dir_invalid = 1; 3164 rw_exit(&map->dir_lock); 3165 } 3166 3167 void 3168 sdev_replace_nsmap(struct devname_nsmap *map, char *module, char *mapname) 3169 { 3170 char *old_module = NULL; 3171 char *old_map = NULL; 3172 3173 ASSERT(RW_LOCK_HELD(&map->dir_lock)); 3174 if (!rw_tryupgrade(&map->dir_lock)) { 3175 rw_exit(&map->dir_lock); 3176 rw_enter(&map->dir_lock, RW_WRITER); 3177 } 3178 3179 old_module = map->dir_module; 3180 if (module) { 3181 if (old_module && strcmp(old_module, module) != 0) { 3182 kmem_free(old_module, strlen(old_module) + 1); 3183 } 3184 map->dir_module = module; 3185 map->dir_newmodule = NULL; 3186 } 3187 3188 old_map = map->dir_map; 3189 if (mapname) { 3190 if (old_map && strcmp(old_map, mapname) != 0) { 3191 kmem_free(old_map, strlen(old_map) + 1); 3192 } 3193 3194 map->dir_map = mapname; 3195 map->dir_newmap = NULL; 3196 } 3197 map->dir_maploaded = 0; 3198 map->dir_invalid = 0; 3199 rw_downgrade(&map->dir_lock); 3200 } 3201 3202 /* 3203 * dir_name should have at least one attribute, 3204 * dir_module 3205 * or dir_map 3206 * or both 3207 * caller holds the devname_nsmaps_lock 3208 */ 3209 void 3210 sdev_insert_nsmap(char *dir_name, char *dir_module, char *dir_map) 3211 { 3212 struct devname_nsmap *map; 3213 int len = 0; 3214 3215 ASSERT(dir_name); 3216 ASSERT(dir_module || dir_map); 3217 ASSERT(MUTEX_HELD(&devname_nsmaps_lock)); 3218 3219 if (map = sdev_get_nsmap_by_dir(dir_name, 1)) { 3220 sdev_update_newnsmap(map, dir_module, dir_map); 3221 return; 3222 } 3223 3224 map = (struct devname_nsmap *)kmem_zalloc(sizeof (*map), KM_SLEEP); 3225 map->dir_name = i_ddi_strdup(dir_name, KM_SLEEP); 3226 if (dir_module) { 3227 map->dir_module = i_ddi_strdup(dir_module, KM_SLEEP); 3228 } 3229 3230 if (dir_map) { 3231 if (dir_map[0] != '/') { 3232 len = strlen(ETC_DEV_DIR) + strlen(dir_map) + 2; 3233 map->dir_map = kmem_zalloc(len, KM_SLEEP); 3234 (void) snprintf(map->dir_map, len, "%s/%s", ETC_DEV_DIR, 3235 dir_map); 3236 } else { 3237 map->dir_map = i_ddi_strdup(dir_map, KM_SLEEP); 3238 } 3239 } 3240 3241 map->dir_ops = NULL; 3242 map->dir_maploaded = 0; 3243 map->dir_invalid = 0; 3244 rw_init(&map->dir_lock, NULL, RW_DEFAULT, NULL); 3245 3246 map->next = devname_nsmaps; 3247 map->prev = NULL; 3248 if (devname_nsmaps) { 3249 devname_nsmaps->prev = map; 3250 } 3251 devname_nsmaps = map; 3252 } 3253 3254 struct devname_nsmap * 3255 sdev_get_nsmap_by_dir(char *dir_path, int locked) 3256 { 3257 struct devname_nsmap *map = NULL; 3258 3259 if (!locked) 3260 mutex_enter(&devname_nsmaps_lock); 3261 for (map = devname_nsmaps; map; map = map->next) { 3262 sdcmn_err6(("sdev_get_nsmap_by_dir: dir %s\n", map->dir_name)); 3263 if (strcmp(map->dir_name, dir_path) == 0) { 3264 if (!locked) 3265 mutex_exit(&devname_nsmaps_lock); 3266 return (map); 3267 } 3268 } 3269 if (!locked) 3270 mutex_exit(&devname_nsmaps_lock); 3271 return (NULL); 3272 } 3273 3274 struct devname_nsmap * 3275 sdev_get_nsmap_by_module(char *mod_name) 3276 { 3277 struct devname_nsmap *map = NULL; 3278 3279 mutex_enter(&devname_nsmaps_lock); 3280 for (map = devname_nsmaps; map; map = map->next) { 3281 sdcmn_err7(("sdev_get_nsmap_by_module: module %s\n", 3282 map->dir_module)); 3283 if (map->dir_module && strcmp(map->dir_module, mod_name) == 0) { 3284 mutex_exit(&devname_nsmaps_lock); 3285 return (map); 3286 } 3287 } 3288 mutex_exit(&devname_nsmaps_lock); 3289 return (NULL); 3290 } 3291 3292 void 3293 sdev_invalidate_nsmaps() 3294 { 3295 struct devname_nsmap *map = NULL; 3296 3297 ASSERT(MUTEX_HELD(&devname_nsmaps_lock)); 3298 3299 if (devname_nsmaps == NULL) 3300 return; 3301 3302 for (map = devname_nsmaps; map; map = map->next) { 3303 rw_enter(&map->dir_lock, RW_WRITER); 3304 map->dir_invalid = 1; 3305 rw_exit(&map->dir_lock); 3306 } 3307 devname_nsmaps_invalidated = 1; 3308 } 3309 3310 3311 int 3312 sdev_nsmaps_loaded() 3313 { 3314 int ret = 0; 3315 3316 mutex_enter(&devname_nsmaps_lock); 3317 if (devname_nsmaps_loaded) 3318 ret = 1; 3319 3320 mutex_exit(&devname_nsmaps_lock); 3321 return (ret); 3322 } 3323 3324 int 3325 sdev_nsmaps_reloaded() 3326 { 3327 int ret = 0; 3328 3329 mutex_enter(&devname_nsmaps_lock); 3330 if (devname_nsmaps_invalidated) 3331 ret = 1; 3332 3333 mutex_exit(&devname_nsmaps_lock); 3334 return (ret); 3335 } 3336 3337 static void 3338 sdev_free_nsmap(struct devname_nsmap *map) 3339 { 3340 ASSERT(map); 3341 if (map->dir_name) 3342 kmem_free(map->dir_name, strlen(map->dir_name) + 1); 3343 if (map->dir_module) 3344 kmem_free(map->dir_module, strlen(map->dir_module) + 1); 3345 if (map->dir_map) 3346 kmem_free(map->dir_map, strlen(map->dir_map) + 1); 3347 rw_destroy(&map->dir_lock); 3348 kmem_free(map, sizeof (*map)); 3349 } 3350 3351 void 3352 sdev_validate_nsmaps() 3353 { 3354 struct devname_nsmap *map = NULL; 3355 struct devname_nsmap *oldmap = NULL; 3356 3357 ASSERT(MUTEX_HELD(&devname_nsmaps_lock)); 3358 map = devname_nsmaps; 3359 while (map) { 3360 rw_enter(&map->dir_lock, RW_READER); 3361 if ((map->dir_invalid == 1) && (map->dir_newmodule == NULL) && 3362 (map->dir_newmap == NULL)) { 3363 oldmap = map; 3364 rw_exit(&map->dir_lock); 3365 if (map->prev) 3366 map->prev->next = oldmap->next; 3367 if (map == devname_nsmaps) 3368 devname_nsmaps = oldmap->next; 3369 3370 map = oldmap->next; 3371 if (map) 3372 map->prev = oldmap->prev; 3373 sdev_free_nsmap(oldmap); 3374 oldmap = NULL; 3375 } else { 3376 rw_exit(&map->dir_lock); 3377 map = map->next; 3378 } 3379 } 3380 devname_nsmaps_invalidated = 0; 3381 } 3382 3383 static int 3384 sdev_map_is_invalid(struct devname_nsmap *map) 3385 { 3386 int ret = 0; 3387 3388 ASSERT(map); 3389 rw_enter(&map->dir_lock, RW_READER); 3390 if (map->dir_invalid) 3391 ret = 1; 3392 rw_exit(&map->dir_lock); 3393 return (ret); 3394 } 3395 3396 static int 3397 sdev_check_map(struct devname_nsmap *map) 3398 { 3399 struct devname_nsmap *mapp; 3400 3401 mutex_enter(&devname_nsmaps_lock); 3402 if (devname_nsmaps == NULL) { 3403 mutex_exit(&devname_nsmaps_lock); 3404 return (1); 3405 } 3406 3407 for (mapp = devname_nsmaps; mapp; mapp = mapp->next) { 3408 if (mapp == map) { 3409 mutex_exit(&devname_nsmaps_lock); 3410 return (0); 3411 } 3412 } 3413 3414 mutex_exit(&devname_nsmaps_lock); 3415 return (1); 3416 3417 } 3418 3419 struct devname_nsmap * 3420 sdev_get_map(struct sdev_node *dv, int validate) 3421 { 3422 struct devname_nsmap *map; 3423 int error; 3424 3425 ASSERT(RW_READ_HELD(&dv->sdev_contents)); 3426 map = dv->sdev_mapinfo; 3427 if (map && sdev_check_map(map)) { 3428 if (!rw_tryupgrade(&dv->sdev_contents)) { 3429 rw_exit(&dv->sdev_contents); 3430 rw_enter(&dv->sdev_contents, RW_WRITER); 3431 } 3432 dv->sdev_mapinfo = NULL; 3433 rw_downgrade(&dv->sdev_contents); 3434 return (NULL); 3435 } 3436 3437 if (validate && (!map || (map && sdev_map_is_invalid(map)))) { 3438 if (!rw_tryupgrade(&dv->sdev_contents)) { 3439 rw_exit(&dv->sdev_contents); 3440 rw_enter(&dv->sdev_contents, RW_WRITER); 3441 } 3442 error = sdev_get_moduleops(dv); 3443 if (!error) 3444 map = dv->sdev_mapinfo; 3445 rw_downgrade(&dv->sdev_contents); 3446 } 3447 return (map); 3448 } 3449 3450 extern int sdev_vnodeops_tbl_size; 3451 3452 /* 3453 * construct a new template with overrides from vtab 3454 */ 3455 static fs_operation_def_t * 3456 sdev_merge_vtab(const fs_operation_def_t tab[]) 3457 { 3458 fs_operation_def_t *new; 3459 const fs_operation_def_t *tab_entry; 3460 3461 /* make a copy of standard vnode ops table */ 3462 new = kmem_alloc(sdev_vnodeops_tbl_size, KM_SLEEP); 3463 bcopy((void *)sdev_vnodeops_tbl, new, sdev_vnodeops_tbl_size); 3464 3465 /* replace the overrides from tab */ 3466 for (tab_entry = tab; tab_entry->name != NULL; tab_entry++) { 3467 fs_operation_def_t *std_entry = new; 3468 while (std_entry->name) { 3469 if (strcmp(tab_entry->name, std_entry->name) == 0) { 3470 std_entry->func = tab_entry->func; 3471 break; 3472 } 3473 std_entry++; 3474 } 3475 if (std_entry->name == NULL) 3476 cmn_err(CE_NOTE, "sdev_merge_vtab: entry %s unused.", 3477 tab_entry->name); 3478 } 3479 3480 return (new); 3481 } 3482 3483 /* free memory allocated by sdev_merge_vtab */ 3484 static void 3485 sdev_free_vtab(fs_operation_def_t *new) 3486 { 3487 kmem_free(new, sdev_vnodeops_tbl_size); 3488 } 3489 3490 void 3491 devname_get_vnode(devname_handle_t *hdl, vnode_t **vpp) 3492 { 3493 struct sdev_node *dv = hdl->dh_data; 3494 3495 ASSERT(dv); 3496 3497 rw_enter(&dv->sdev_contents, RW_READER); 3498 *vpp = SDEVTOV(dv); 3499 rw_exit(&dv->sdev_contents); 3500 } 3501 3502 int 3503 devname_get_path(devname_handle_t *hdl, char **path) 3504 { 3505 struct sdev_node *dv = hdl->dh_data; 3506 3507 ASSERT(dv); 3508 3509 rw_enter(&dv->sdev_contents, RW_READER); 3510 *path = dv->sdev_path; 3511 rw_exit(&dv->sdev_contents); 3512 return (0); 3513 } 3514 3515 int 3516 devname_get_name(devname_handle_t *hdl, char **entry) 3517 { 3518 struct sdev_node *dv = hdl->dh_data; 3519 3520 ASSERT(dv); 3521 rw_enter(&dv->sdev_contents, RW_READER); 3522 *entry = dv->sdev_name; 3523 rw_exit(&dv->sdev_contents); 3524 return (0); 3525 } 3526 3527 void 3528 devname_get_dir_vnode(devname_handle_t *hdl, vnode_t **vpp) 3529 { 3530 struct sdev_node *dv = hdl->dh_data->sdev_dotdot; 3531 3532 ASSERT(dv); 3533 3534 rw_enter(&dv->sdev_contents, RW_READER); 3535 *vpp = SDEVTOV(dv); 3536 rw_exit(&dv->sdev_contents); 3537 } 3538 3539 int 3540 devname_get_dir_path(devname_handle_t *hdl, char **path) 3541 { 3542 struct sdev_node *dv = hdl->dh_data->sdev_dotdot; 3543 3544 ASSERT(dv); 3545 rw_enter(&dv->sdev_contents, RW_READER); 3546 *path = dv->sdev_path; 3547 rw_exit(&dv->sdev_contents); 3548 return (0); 3549 } 3550 3551 int 3552 devname_get_dir_name(devname_handle_t *hdl, char **entry) 3553 { 3554 struct sdev_node *dv = hdl->dh_data->sdev_dotdot; 3555 3556 ASSERT(dv); 3557 rw_enter(&dv->sdev_contents, RW_READER); 3558 *entry = dv->sdev_name; 3559 rw_exit(&dv->sdev_contents); 3560 return (0); 3561 } 3562 3563 int 3564 devname_get_dir_nsmap(devname_handle_t *hdl, struct devname_nsmap **map) 3565 { 3566 struct sdev_node *dv = hdl->dh_data->sdev_dotdot; 3567 3568 ASSERT(dv); 3569 rw_enter(&dv->sdev_contents, RW_READER); 3570 *map = dv->sdev_mapinfo; 3571 rw_exit(&dv->sdev_contents); 3572 return (0); 3573 } 3574 3575 int 3576 devname_get_dir_handle(devname_handle_t *hdl, devname_handle_t **dir_hdl) 3577 { 3578 struct sdev_node *dv = hdl->dh_data->sdev_dotdot; 3579 3580 ASSERT(dv); 3581 rw_enter(&dv->sdev_contents, RW_READER); 3582 *dir_hdl = &(dv->sdev_handle); 3583 rw_exit(&dv->sdev_contents); 3584 return (0); 3585 } 3586 3587 void 3588 devname_set_nodetype(devname_handle_t *hdl, void *args, int spec) 3589 { 3590 struct sdev_node *dv = hdl->dh_data; 3591 3592 ASSERT(dv); 3593 rw_enter(&dv->sdev_contents, RW_WRITER); 3594 hdl->dh_spec = (devname_spec_t)spec; 3595 hdl->dh_args = (void *)i_ddi_strdup((char *)args, KM_SLEEP); 3596 rw_exit(&dv->sdev_contents); 3597 } 3598 3599 /* 3600 * a generic setattr() function 3601 * 3602 * note: flags only supports AT_UID and AT_GID. 3603 * Future enhancements can be done for other types, e.g. AT_MODE 3604 */ 3605 int 3606 devname_setattr_func(struct vnode *vp, struct vattr *vap, int flags, 3607 struct cred *cred, int (*callback)(struct sdev_node *, struct vattr *, 3608 int), int protocol) 3609 { 3610 struct sdev_node *dv = VTOSDEV(vp); 3611 struct sdev_node *parent = dv->sdev_dotdot; 3612 struct vattr *get; 3613 uint_t mask = vap->va_mask; 3614 int error; 3615 3616 /* some sanity checks */ 3617 if (vap->va_mask & AT_NOSET) 3618 return (EINVAL); 3619 3620 if (vap->va_mask & AT_SIZE) { 3621 if (vp->v_type == VDIR) { 3622 return (EISDIR); 3623 } 3624 } 3625 3626 /* no need to set attribute, but do not fail either */ 3627 ASSERT(parent); 3628 rw_enter(&parent->sdev_contents, RW_READER); 3629 if (dv->sdev_state == SDEV_ZOMBIE) { 3630 rw_exit(&parent->sdev_contents); 3631 return (0); 3632 } 3633 3634 /* If backing store exists, just set it. */ 3635 if (dv->sdev_attrvp) { 3636 rw_exit(&parent->sdev_contents); 3637 return (VOP_SETATTR(dv->sdev_attrvp, vap, flags, cred, NULL)); 3638 } 3639 3640 /* 3641 * Otherwise, for nodes with the persistence attribute, create it. 3642 */ 3643 ASSERT(dv->sdev_attr); 3644 if (SDEV_IS_PERSIST(dv) || 3645 ((vap->va_mask & ~AT_TIMES) != 0 && !SDEV_IS_DYNAMIC(dv))) { 3646 sdev_vattr_merge(dv, vap); 3647 rw_enter(&dv->sdev_contents, RW_WRITER); 3648 error = sdev_shadow_node(dv, cred); 3649 rw_exit(&dv->sdev_contents); 3650 rw_exit(&parent->sdev_contents); 3651 3652 if (error) 3653 return (error); 3654 return (VOP_SETATTR(dv->sdev_attrvp, vap, flags, cred, NULL)); 3655 } 3656 3657 3658 /* 3659 * sdev_attr was allocated in sdev_mknode 3660 */ 3661 rw_enter(&dv->sdev_contents, RW_WRITER); 3662 error = secpolicy_vnode_setattr(cred, vp, vap, dv->sdev_attr, 3663 flags, sdev_unlocked_access, dv); 3664 if (error) { 3665 rw_exit(&dv->sdev_contents); 3666 rw_exit(&parent->sdev_contents); 3667 return (error); 3668 } 3669 3670 get = dv->sdev_attr; 3671 if (mask & AT_MODE) { 3672 get->va_mode &= S_IFMT; 3673 get->va_mode |= vap->va_mode & ~S_IFMT; 3674 } 3675 3676 if ((mask & AT_UID) || (mask & AT_GID)) { 3677 if (mask & AT_UID) 3678 get->va_uid = vap->va_uid; 3679 if (mask & AT_GID) 3680 get->va_gid = vap->va_gid; 3681 /* 3682 * a callback must be provided if the protocol is set 3683 */ 3684 if ((protocol & AT_UID) || (protocol & AT_GID)) { 3685 ASSERT(callback); 3686 error = callback(dv, get, protocol); 3687 if (error) { 3688 rw_exit(&dv->sdev_contents); 3689 rw_exit(&parent->sdev_contents); 3690 return (error); 3691 } 3692 } 3693 } 3694 3695 if (mask & AT_ATIME) 3696 get->va_atime = vap->va_atime; 3697 if (mask & AT_MTIME) 3698 get->va_mtime = vap->va_mtime; 3699 if (mask & (AT_MODE | AT_UID | AT_GID | AT_CTIME)) { 3700 gethrestime(&get->va_ctime); 3701 } 3702 3703 sdev_vattr_merge(dv, get); 3704 rw_exit(&dv->sdev_contents); 3705 rw_exit(&parent->sdev_contents); 3706 return (0); 3707 } 3708