1 0 stevel /* 2 0 stevel * CDDL HEADER START 3 0 stevel * 4 0 stevel * The contents of this file are subject to the terms of the 5 2267 dp * Common Development and Distribution License (the "License"). 6 2267 dp * You may not use this file except in compliance with the License. 7 0 stevel * 8 0 stevel * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 0 stevel * or http://www.opensolaris.org/os/licensing. 10 0 stevel * See the License for the specific language governing permissions 11 0 stevel * and limitations under the License. 12 0 stevel * 13 0 stevel * When distributing Covered Code, include this CDDL HEADER in each 14 0 stevel * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 0 stevel * If applicable, add the following below this CDDL HEADER, with the 16 0 stevel * fields enclosed by brackets "[]" replaced with your own identifying 17 0 stevel * information: Portions Copyright [yyyy] [name of copyright owner] 18 0 stevel * 19 0 stevel * CDDL HEADER END 20 0 stevel */ 21 390 raf 22 0 stevel /* 23 9160 Sherry * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 24 0 stevel * Use is subject to license terms. 25 0 stevel */ 26 0 stevel 27 0 stevel #include <sys/param.h> 28 0 stevel #include <sys/types.h> 29 0 stevel #include <sys/sysmacros.h> 30 0 stevel #include <sys/systm.h> 31 0 stevel #include <sys/errno.h> 32 0 stevel #include <sys/vfs.h> 33 0 stevel #include <sys/vnode.h> 34 0 stevel #include <sys/swap.h> 35 0 stevel #include <sys/file.h> 36 0 stevel #include <sys/proc.h> 37 0 stevel #include <sys/var.h> 38 0 stevel #include <sys/uadmin.h> 39 0 stevel #include <sys/signal.h> 40 0 stevel #include <sys/time.h> 41 0 stevel #include <vm/seg_kmem.h> 42 0 stevel #include <sys/modctl.h> 43 0 stevel #include <sys/callb.h> 44 0 stevel #include <sys/dumphdr.h> 45 0 stevel #include <sys/debug.h> 46 0 stevel #include <sys/ftrace.h> 47 0 stevel #include <sys/cmn_err.h> 48 0 stevel #include <sys/panic.h> 49 0 stevel #include <sys/ddi.h> 50 0 stevel #include <sys/sunddi.h> 51 0 stevel #include <sys/policy.h> 52 0 stevel #include <sys/zone.h> 53 4579 cg209009 #include <sys/condvar.h> 54 4579 cg209009 #include <sys/thread.h> 55 6878 brendan #include <sys/sdt.h> 56 0 stevel 57 0 stevel /* 58 0 stevel * Administrivia system call. We provide this in two flavors: one for calling 59 0 stevel * from the system call path (uadmin), and the other for calling from elsewhere 60 0 stevel * within the kernel (kadmin). Callers must beware that certain uadmin cmd 61 0 stevel * values (specifically A_SWAPCTL) are only supported by uadmin and not kadmin. 62 0 stevel */ 63 0 stevel 64 0 stevel extern ksema_t fsflush_sema; 65 0 stevel kmutex_t ualock; 66 4579 cg209009 kcondvar_t uacond; 67 4579 cg209009 kthread_t *ua_shutdown_thread = NULL; 68 0 stevel 69 2621 llai1 int sys_shutdown = 0; 70 7656 Sherry volatile int fastreboot_dryrun = 0; 71 0 stevel 72 0 stevel /* 73 0 stevel * Kill all user processes in said zone. A special argument of ALL_ZONES is 74 0 stevel * passed in when the system as a whole is shutting down. The lack of per-zone 75 0 stevel * process lists is likely to make the following a performance bottleneck on a 76 0 stevel * system with many zones. 77 0 stevel */ 78 0 stevel void 79 0 stevel killall(zoneid_t zoneid) 80 0 stevel { 81 0 stevel proc_t *p; 82 0 stevel 83 0 stevel ASSERT(zoneid != GLOBAL_ZONEID); 84 0 stevel /* 85 0 stevel * Kill all processes except kernel daemons and ourself. 86 0 stevel * Make a first pass to stop all processes so they won't 87 0 stevel * be trying to restart children as we kill them. 88 0 stevel */ 89 0 stevel mutex_enter(&pidlock); 90 0 stevel for (p = practive; p != NULL; p = p->p_next) { 91 0 stevel if ((zoneid == ALL_ZONES || p->p_zone->zone_id == zoneid) && 92 0 stevel p->p_exec != NULLVP && /* kernel daemons */ 93 0 stevel p->p_as != &kas && 94 0 stevel p->p_stat != SZOMB) { 95 0 stevel mutex_enter(&p->p_lock); 96 0 stevel p->p_flag |= SNOWAIT; 97 0 stevel sigtoproc(p, NULL, SIGSTOP); 98 0 stevel mutex_exit(&p->p_lock); 99 0 stevel } 100 0 stevel } 101 0 stevel p = practive; 102 0 stevel while (p != NULL) { 103 0 stevel if ((zoneid == ALL_ZONES || p->p_zone->zone_id == zoneid) && 104 0 stevel p->p_exec != NULLVP && /* kernel daemons */ 105 0 stevel p->p_as != &kas && 106 0 stevel p->p_stat != SIDL && 107 0 stevel p->p_stat != SZOMB) { 108 0 stevel mutex_enter(&p->p_lock); 109 0 stevel if (sigismember(&p->p_sig, SIGKILL)) { 110 0 stevel mutex_exit(&p->p_lock); 111 0 stevel p = p->p_next; 112 0 stevel } else { 113 0 stevel sigtoproc(p, NULL, SIGKILL); 114 0 stevel mutex_exit(&p->p_lock); 115 11066 rafael (void) cv_reltimedwait(&p->p_srwchan_cv, 116 11066 rafael &pidlock, hz, TR_CLOCK_TICK); 117 0 stevel p = practive; 118 0 stevel } 119 0 stevel } else { 120 0 stevel p = p->p_next; 121 0 stevel } 122 0 stevel } 123 0 stevel mutex_exit(&pidlock); 124 0 stevel } 125 0 stevel 126 0 stevel int 127 0 stevel kadmin(int cmd, int fcn, void *mdep, cred_t *credp) 128 0 stevel { 129 0 stevel int error = 0; 130 0 stevel char *buf; 131 0 stevel size_t buflen = 0; 132 136 achartre boolean_t invoke_cb = B_FALSE; 133 0 stevel 134 0 stevel /* 135 0 stevel * We might be called directly by the kernel's fault-handling code, so 136 0 stevel * we can't assert that the caller is in the global zone. 137 0 stevel */ 138 0 stevel 139 0 stevel /* 140 0 stevel * Make sure that cmd is one of the valid <sys/uadmin.h> command codes 141 0 stevel * and that we have appropriate privileges for this action. 142 0 stevel */ 143 0 stevel switch (cmd) { 144 0 stevel case A_FTRACE: 145 0 stevel case A_SHUTDOWN: 146 0 stevel case A_REBOOT: 147 0 stevel case A_REMOUNT: 148 0 stevel case A_FREEZE: 149 0 stevel case A_DUMP: 150 6878 brendan case A_SDTTEST: 151 9160 Sherry case A_CONFIG: 152 0 stevel if (secpolicy_sys_config(credp, B_FALSE) != 0) 153 0 stevel return (EPERM); 154 0 stevel break; 155 0 stevel 156 0 stevel default: 157 0 stevel return (EINVAL); 158 0 stevel } 159 0 stevel 160 0 stevel /* 161 4579 cg209009 * Serialize these operations on ualock. If it is held, the 162 4579 cg209009 * system should shutdown, reboot, or remount shortly, unless there is 163 4579 cg209009 * an error. We need a cv rather than just a mutex because proper 164 4579 cg209009 * functioning of A_REBOOT relies on being able to interrupt blocked 165 4579 cg209009 * userland callers. 166 4579 cg209009 * 167 9160 Sherry * We only clear ua_shutdown_thread after A_REMOUNT or A_CONFIG. 168 9160 Sherry * Other commands should never return. 169 0 stevel */ 170 9160 Sherry if (cmd == A_SHUTDOWN || cmd == A_REBOOT || cmd == A_REMOUNT || 171 9160 Sherry cmd == A_CONFIG) { 172 4579 cg209009 mutex_enter(&ualock); 173 4579 cg209009 while (ua_shutdown_thread != NULL) { 174 4579 cg209009 if (cv_wait_sig(&uacond, &ualock) == 0) { 175 4579 cg209009 /* 176 4579 cg209009 * If we were interrupted, leave, and handle 177 4579 cg209009 * the signal (or exit, depending on what 178 4579 cg209009 * happened) 179 4579 cg209009 */ 180 4579 cg209009 mutex_exit(&ualock); 181 4579 cg209009 return (EINTR); 182 4579 cg209009 } 183 4579 cg209009 } 184 4579 cg209009 ua_shutdown_thread = curthread; 185 4579 cg209009 mutex_exit(&ualock); 186 0 stevel } 187 0 stevel 188 0 stevel switch (cmd) { 189 0 stevel case A_SHUTDOWN: 190 0 stevel { 191 0 stevel proc_t *p = ttoproc(curthread); 192 0 stevel 193 0 stevel /* 194 0 stevel * Release (almost) all of our own resources if we are called 195 0 stevel * from a user context, however if we are calling kadmin() from 196 0 stevel * a kernel context then we do not release these resources. 197 0 stevel */ 198 390 raf if (p != &p0) { 199 390 raf proc_is_exiting(p); 200 4434 cg209009 if ((error = exitlwps(0)) != 0) { 201 4579 cg209009 /* 202 4579 cg209009 * Another thread in this process also called 203 4579 cg209009 * exitlwps(). 204 4579 cg209009 */ 205 4579 cg209009 mutex_enter(&ualock); 206 4579 cg209009 ua_shutdown_thread = NULL; 207 4579 cg209009 cv_signal(&uacond); 208 4434 cg209009 mutex_exit(&ualock); 209 0 stevel return (error); 210 4434 cg209009 } 211 0 stevel mutex_enter(&p->p_lock); 212 0 stevel p->p_flag |= SNOWAIT; 213 0 stevel sigfillset(&p->p_ignore); 214 0 stevel curthread->t_lwp->lwp_cursig = 0; 215 0 stevel curthread->t_lwp->lwp_extsig = 0; 216 0 stevel if (p->p_exec) { 217 0 stevel vnode_t *exec_vp = p->p_exec; 218 0 stevel p->p_exec = NULLVP; 219 0 stevel mutex_exit(&p->p_lock); 220 0 stevel VN_RELE(exec_vp); 221 0 stevel } else { 222 0 stevel mutex_exit(&p->p_lock); 223 0 stevel } 224 0 stevel 225 0 stevel pollcleanup(); 226 0 stevel closeall(P_FINFO(curproc)); 227 0 stevel relvm(); 228 0 stevel 229 0 stevel } else { 230 0 stevel /* 231 0 stevel * Reset t_cred if not set because much of the 232 0 stevel * filesystem code depends on CRED() being valid. 233 0 stevel */ 234 0 stevel if (curthread->t_cred == NULL) 235 0 stevel curthread->t_cred = kcred; 236 0 stevel } 237 2621 llai1 238 2621 llai1 /* indicate shutdown in progress */ 239 2621 llai1 sys_shutdown = 1; 240 0 stevel 241 0 stevel /* 242 0 stevel * Communcate that init shouldn't be restarted. 243 0 stevel */ 244 0 stevel zone_shutdown_global(); 245 0 stevel 246 0 stevel killall(ALL_ZONES); 247 0 stevel /* 248 0 stevel * If we are calling kadmin() from a kernel context then we 249 0 stevel * do not release these resources. 250 0 stevel */ 251 0 stevel if (ttoproc(curthread) != &p0) { 252 3446 mrj VN_RELE(PTOU(curproc)->u_cdir); 253 3446 mrj if (PTOU(curproc)->u_rdir) 254 3446 mrj VN_RELE(PTOU(curproc)->u_rdir); 255 3446 mrj if (PTOU(curproc)->u_cwd) 256 3446 mrj refstr_rele(PTOU(curproc)->u_cwd); 257 0 stevel 258 3446 mrj PTOU(curproc)->u_cdir = rootdir; 259 3446 mrj PTOU(curproc)->u_rdir = NULL; 260 3446 mrj PTOU(curproc)->u_cwd = NULL; 261 0 stevel } 262 0 stevel 263 0 stevel /* 264 0 stevel * Allow the reboot/halt/poweroff code a chance to do 265 0 stevel * anything it needs to whilst we still have filesystems 266 0 stevel * mounted, like loading any modules necessary for later 267 0 stevel * performing the actual poweroff. 268 0 stevel */ 269 0 stevel if ((mdep != NULL) && (*(char *)mdep == '/')) { 270 0 stevel buf = i_convert_boot_device_name(mdep, NULL, &buflen); 271 0 stevel mdpreboot(cmd, fcn, buf); 272 0 stevel } else 273 0 stevel mdpreboot(cmd, fcn, mdep); 274 0 stevel 275 0 stevel /* 276 0 stevel * Allow fsflush to finish running and then prevent it 277 0 stevel * from ever running again so that vfs_unmountall() and 278 0 stevel * vfs_syncall() can acquire the vfs locks they need. 279 0 stevel */ 280 0 stevel sema_p(&fsflush_sema); 281 0 stevel (void) callb_execute_class(CB_CL_UADMIN_PRE_VFS, NULL); 282 0 stevel 283 0 stevel vfs_unmountall(); 284 0 stevel (void) VFS_MOUNTROOT(rootvfs, ROOT_UNMOUNT); 285 0 stevel vfs_syncall(); 286 0 stevel 287 0 stevel dump_ereports(); 288 0 stevel dump_messages(); 289 136 achartre 290 136 achartre invoke_cb = B_TRUE; 291 0 stevel 292 0 stevel /* FALLTHROUGH */ 293 0 stevel } 294 0 stevel 295 0 stevel case A_REBOOT: 296 0 stevel if ((mdep != NULL) && (*(char *)mdep == '/')) { 297 0 stevel buf = i_convert_boot_device_name(mdep, NULL, &buflen); 298 136 achartre mdboot(cmd, fcn, buf, invoke_cb); 299 0 stevel } else 300 136 achartre mdboot(cmd, fcn, mdep, invoke_cb); 301 0 stevel /* no return expected */ 302 0 stevel break; 303 0 stevel 304 9160 Sherry case A_CONFIG: 305 9160 Sherry switch (fcn) { 306 9160 Sherry case AD_UPDATE_BOOT_CONFIG: 307 9160 Sherry #ifndef __sparc 308 9160 Sherry { 309 9160 Sherry extern void fastboot_update_config(const char *); 310 9160 Sherry 311 10559 Sherry fastboot_update_config(mdep); 312 9160 Sherry } 313 9160 Sherry #endif 314 9160 Sherry 315 9160 Sherry break; 316 9160 Sherry } 317 9160 Sherry /* Let other threads enter the shutdown path now */ 318 9160 Sherry mutex_enter(&ualock); 319 9160 Sherry ua_shutdown_thread = NULL; 320 9160 Sherry cv_signal(&uacond); 321 9160 Sherry mutex_exit(&ualock); 322 9160 Sherry break; 323 9160 Sherry 324 0 stevel case A_REMOUNT: 325 0 stevel (void) VFS_MOUNTROOT(rootvfs, ROOT_REMOUNT); 326 4579 cg209009 /* Let other threads enter the shutdown path now */ 327 4579 cg209009 mutex_enter(&ualock); 328 4579 cg209009 ua_shutdown_thread = NULL; 329 4579 cg209009 cv_signal(&uacond); 330 4579 cg209009 mutex_exit(&ualock); 331 0 stevel break; 332 0 stevel 333 0 stevel case A_FREEZE: 334 0 stevel { 335 5295 randyf /* 336 5295 randyf * This is the entrypoint for all suspend/resume actions. 337 5295 randyf */ 338 5295 randyf extern int cpr(int, void *); 339 0 stevel 340 0 stevel if (modload("misc", "cpr") == -1) 341 0 stevel return (ENOTSUP); 342 5295 randyf /* Let the CPR module decide what to do with mdep */ 343 5295 randyf error = cpr(fcn, mdep); 344 0 stevel break; 345 0 stevel } 346 0 stevel 347 0 stevel case A_FTRACE: 348 0 stevel { 349 0 stevel switch (fcn) { 350 0 stevel case AD_FTRACE_START: 351 0 stevel (void) FTRACE_START(); 352 0 stevel break; 353 0 stevel case AD_FTRACE_STOP: 354 0 stevel (void) FTRACE_STOP(); 355 0 stevel break; 356 0 stevel default: 357 0 stevel error = EINVAL; 358 0 stevel } 359 0 stevel break; 360 0 stevel } 361 0 stevel 362 0 stevel case A_DUMP: 363 0 stevel { 364 0 stevel if (fcn == AD_NOSYNC) { 365 0 stevel in_sync = 1; 366 0 stevel break; 367 0 stevel } 368 0 stevel 369 0 stevel panic_bootfcn = fcn; 370 0 stevel panic_forced = 1; 371 0 stevel 372 0 stevel if ((mdep != NULL) && (*(char *)mdep == '/')) { 373 0 stevel panic_bootstr = i_convert_boot_device_name(mdep, 374 2267 dp NULL, &buflen); 375 0 stevel } else 376 0 stevel panic_bootstr = mdep; 377 9160 Sherry 378 9160 Sherry #ifndef __sparc 379 10559 Sherry extern void fastboot_update_and_load(int, char *); 380 9160 Sherry 381 10559 Sherry fastboot_update_and_load(fcn, mdep); 382 9160 Sherry #endif 383 0 stevel 384 0 stevel panic("forced crash dump initiated at user request"); 385 0 stevel /*NOTREACHED*/ 386 0 stevel } 387 0 stevel 388 6878 brendan case A_SDTTEST: 389 6878 brendan { 390 6878 brendan DTRACE_PROBE7(test, int, 1, int, 2, int, 3, int, 4, int, 5, 391 6878 brendan int, 6, int, 7); 392 6878 brendan break; 393 6878 brendan } 394 6878 brendan 395 0 stevel default: 396 0 stevel error = EINVAL; 397 0 stevel } 398 0 stevel 399 0 stevel return (error); 400 0 stevel } 401 0 stevel 402 0 stevel int 403 0 stevel uadmin(int cmd, int fcn, uintptr_t mdep) 404 0 stevel { 405 0 stevel int error = 0, rv = 0; 406 0 stevel size_t nbytes = 0; 407 0 stevel cred_t *credp = CRED(); 408 2267 dp char *bootargs = NULL; 409 7656 Sherry int reset_status = 0; 410 7656 Sherry 411 7656 Sherry if (cmd == A_SHUTDOWN && fcn == AD_FASTREBOOT_DRYRUN) { 412 7656 Sherry ddi_walk_devs(ddi_root_node(), check_driver_quiesce, 413 7656 Sherry &reset_status); 414 7656 Sherry if (reset_status != 0) 415 7656 Sherry return (EIO); 416 7656 Sherry else 417 7656 Sherry return (0); 418 7656 Sherry } 419 0 stevel 420 0 stevel /* 421 0 stevel * The swapctl system call doesn't have its own entry point: it uses 422 0 stevel * uadmin as a wrapper so we just call it directly from here. 423 0 stevel */ 424 0 stevel if (cmd == A_SWAPCTL) { 425 0 stevel if (get_udatamodel() == DATAMODEL_NATIVE) 426 0 stevel error = swapctl(fcn, (void *)mdep, &rv); 427 0 stevel #if defined(_SYSCALL32_IMPL) 428 0 stevel else 429 0 stevel error = swapctl32(fcn, (void *)mdep, &rv); 430 0 stevel #endif /* _SYSCALL32_IMPL */ 431 0 stevel return (error ? set_errno(error) : rv); 432 0 stevel } 433 0 stevel 434 0 stevel /* 435 2267 dp * Certain subcommands intepret a non-NULL mdep value as a pointer to 436 2267 dp * a boot string. We pull that in as bootargs, if applicable. 437 0 stevel */ 438 2267 dp if (mdep != NULL && 439 5295 randyf (cmd == A_SHUTDOWN || cmd == A_REBOOT || cmd == A_DUMP || 440 9160 Sherry cmd == A_FREEZE || cmd == A_CONFIG)) { 441 2267 dp bootargs = kmem_zalloc(BOOTARGS_MAX, KM_SLEEP); 442 2267 dp if ((error = copyinstr((const char *)mdep, bootargs, 443 2267 dp BOOTARGS_MAX, &nbytes)) != 0) { 444 2267 dp kmem_free(bootargs, BOOTARGS_MAX); 445 2267 dp return (set_errno(error)); 446 2267 dp } 447 0 stevel } 448 0 stevel 449 0 stevel /* 450 2267 dp * Invoke the appropriate kadmin() routine. 451 0 stevel */ 452 2267 dp if (getzoneid() != GLOBAL_ZONEID) 453 2267 dp error = zone_kadmin(cmd, fcn, bootargs, credp); 454 2267 dp else 455 2267 dp error = kadmin(cmd, fcn, bootargs, credp); 456 0 stevel 457 2267 dp if (bootargs != NULL) 458 2267 dp kmem_free(bootargs, BOOTARGS_MAX); 459 2267 dp return (error ? set_errno(error) : 0); 460 0 stevel } 461
Indexes created Thu Nov 26 20:23:21 UTC 2009
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