Mercurial > illumos > illumos-gate
annotate usr/src/uts/common/io/lvm/mirror/mirror.c @ 1366:18ae7db30fe7
6376469 Drivers are declaring _depends_on incorrectly leading to venus optimizing it out
| author | petede |
|---|---|
| date | Wed, 01 Feb 2006 07:47:13 -0800 |
| parents | 042bf15ebd92 |
| children | 7bac4a816ebe |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 * CDDL HEADER START | |
| 3 * | |
| 4 * The contents of this file are subject to the terms of the | |
|
1366
18ae7db30fe7
6376469 Drivers are declaring _depends_on incorrectly leading to venus optimizing it out
petede
parents:
46
diff
changeset
|
5 * Common Development and Distribution License (the "License"). |
|
18ae7db30fe7
6376469 Drivers are declaring _depends_on incorrectly leading to venus optimizing it out
petede
parents:
46
diff
changeset
|
6 * You may not use this file except in compliance with the License. |
| 0 | 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 /* | |
|
1366
18ae7db30fe7
6376469 Drivers are declaring _depends_on incorrectly leading to venus optimizing it out
petede
parents:
46
diff
changeset
|
22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. |
| 0 | 23 * Use is subject to license terms. |
| 24 */ | |
| 25 | |
| 26 #pragma ident "%Z%%M% %I% %E% SMI" | |
| 27 | |
| 28 #include <sys/param.h> | |
| 29 #include <sys/systm.h> | |
| 30 #include <sys/conf.h> | |
| 31 #include <sys/file.h> | |
| 32 #include <sys/user.h> | |
| 33 #include <sys/uio.h> | |
| 34 #include <sys/t_lock.h> | |
| 35 #include <sys/buf.h> | |
| 36 #include <sys/dkio.h> | |
| 37 #include <sys/vtoc.h> | |
| 38 #include <sys/kmem.h> | |
| 39 #include <vm/page.h> | |
| 40 #include <sys/cmn_err.h> | |
| 41 #include <sys/sysmacros.h> | |
| 42 #include <sys/types.h> | |
| 43 #include <sys/mkdev.h> | |
| 44 #include <sys/stat.h> | |
| 45 #include <sys/open.h> | |
| 46 #include <sys/modctl.h> | |
| 47 #include <sys/ddi.h> | |
| 48 #include <sys/sunddi.h> | |
| 49 #include <sys/debug.h> | |
| 50 #include <sys/dklabel.h> | |
| 51 #include <vm/hat.h> | |
| 52 #include <sys/lvm/md_mirror.h> | |
| 53 #include <sys/lvm/md_convert.h> | |
| 54 #include <sys/lvm/md_mddb.h> | |
| 55 #include <sys/esunddi.h> | |
| 56 | |
| 57 #include <sys/sysevent/eventdefs.h> | |
| 58 #include <sys/sysevent/svm.h> | |
| 59 #include <sys/lvm/mdmn_commd.h> | |
| 60 | |
| 61 md_ops_t mirror_md_ops; | |
| 62 #ifndef lint | |
|
1366
18ae7db30fe7
6376469 Drivers are declaring _depends_on incorrectly leading to venus optimizing it out
petede
parents:
46
diff
changeset
|
63 char _depends_on[] = "drv/md"; |
| 0 | 64 md_ops_t *md_interface_ops = &mirror_md_ops; |
| 65 #endif | |
| 66 | |
| 67 extern mdq_anchor_t md_done_daemon; | |
| 68 extern mdq_anchor_t md_mstr_daemon; | |
| 69 extern mdq_anchor_t md_mirror_daemon; | |
| 70 extern mdq_anchor_t md_mirror_io_daemon; | |
| 71 extern mdq_anchor_t md_mirror_rs_daemon; | |
| 72 extern mdq_anchor_t md_mhs_daemon; | |
| 73 | |
| 74 extern unit_t md_nunits; | |
| 75 extern set_t md_nsets; | |
| 76 extern md_set_t md_set[]; | |
| 77 | |
| 78 extern int md_status; | |
| 79 extern clock_t md_hz; | |
| 80 | |
| 81 extern md_krwlock_t md_unit_array_rw; | |
| 82 extern kmutex_t md_mx; | |
| 83 extern kcondvar_t md_cv; | |
| 84 extern int md_mtioctl_cnt; | |
| 85 | |
| 86 daemon_request_t mirror_timeout; | |
| 87 static daemon_request_t hotspare_request; | |
| 88 static daemon_request_t mn_hs_request[MD_MAXSETS]; /* Multinode hs req */ | |
| 89 | |
| 90 int md_mirror_mcs_buf_off; | |
| 91 | |
| 92 /* Flags for mdmn_ksend_message to allow debugging */ | |
| 93 int md_mirror_msg_flags; | |
| 94 | |
| 95 #ifdef DEBUG | |
| 96 /* Flag to switch on debug messages */ | |
| 97 int mirror_debug_flag = 0; | |
| 98 #endif | |
| 99 | |
| 100 /* | |
| 101 * Struct used to hold count of DMR reads and the timestamp of last DMR read | |
| 102 * It is used to verify, using a debugger, that the DMR read ioctl has been | |
| 103 * executed. | |
| 104 */ | |
| 105 dmr_stats_t mirror_dmr_stats = {0, 0}; | |
| 106 | |
| 107 /* | |
| 108 * Mutex protecting list of non-failfast drivers. | |
| 109 */ | |
| 110 static kmutex_t non_ff_drv_mutex; | |
| 111 static char **non_ff_drivers = NULL; | |
| 112 | |
| 113 extern major_t md_major; | |
| 114 | |
| 115 /* | |
| 116 * Write-On-Write memory pool. | |
| 117 */ | |
| 118 static void copy_write_cont(wowhdr_t *wowhdr); | |
| 119 static kmem_cache_t *mirror_wowblk_cache = NULL; | |
| 120 static int md_wowbuf_size = 16384; | |
| 121 static size_t md_wowblk_size; | |
| 122 | |
| 123 /* | |
| 124 * This is a flag that allows: | |
| 125 * - disabling the write-on-write mechanism. | |
| 126 * - logging occurrences of write-on-write | |
| 127 * - switching wow handling procedure processing | |
| 128 * Counter for occurences of WOW. | |
| 129 */ | |
| 130 static uint_t md_mirror_wow_flg = 0; | |
| 131 static int md_mirror_wow_cnt = 0; | |
| 132 | |
| 133 /* | |
| 134 * Tunable to enable/disable dirty region | |
| 135 * processing when closing down a mirror. | |
| 136 */ | |
| 137 static int new_resync = 1; | |
| 138 kmem_cache_t *mirror_parent_cache = NULL; | |
| 139 kmem_cache_t *mirror_child_cache = NULL; | |
| 140 | |
| 141 extern int md_ff_disable; /* disable failfast */ | |
| 142 | |
| 143 static int mirror_map_write(mm_unit_t *, md_mcs_t *, md_mps_t *, int); | |
| 144 static void mirror_read_strategy(buf_t *, int, void *); | |
| 145 static void mirror_write_strategy(buf_t *, int, void *); | |
| 146 static void become_owner(daemon_queue_t *); | |
| 147 static int mirror_done(struct buf *cb); | |
| 148 static int mirror_done_common(struct buf *cb); | |
| 149 static void clear_retry_error(struct buf *cb); | |
| 150 | |
| 151 /* | |
| 152 * patchables | |
| 153 */ | |
| 154 int md_min_rr_size = 200; /* 2000 blocks, or 100k */ | |
| 155 int md_def_num_rr = 1000; /* Default number of dirty regions */ | |
| 156 | |
| 157 /* | |
| 158 * patchable to change delay before rescheduling mirror ownership request. | |
| 159 * Value is clock ticks, default 0.5 seconds | |
| 160 */ | |
| 161 clock_t md_mirror_owner_to = 500000; | |
| 162 | |
| 163 /*ARGSUSED1*/ | |
| 164 static int | |
| 165 mirror_parent_constructor(void *p, void *d1, int d2) | |
| 166 { | |
| 167 mutex_init(&((md_mps_t *)p)->ps_mx, NULL, MUTEX_DEFAULT, NULL); | |
| 168 return (0); | |
| 169 } | |
| 170 | |
| 171 static void | |
| 172 mirror_parent_init(md_mps_t *ps) | |
| 173 { | |
| 174 bzero(ps, offsetof(md_mps_t, ps_mx)); | |
| 175 } | |
| 176 | |
| 177 /*ARGSUSED1*/ | |
| 178 static void | |
| 179 mirror_parent_destructor(void *p, void *d) | |
| 180 { | |
| 181 mutex_destroy(&((md_mps_t *)p)->ps_mx); | |
| 182 } | |
| 183 | |
| 184 /*ARGSUSED1*/ | |
| 185 static int | |
| 186 mirror_child_constructor(void *p, void *d1, int d2) | |
| 187 { | |
| 188 bioinit(&((md_mcs_t *)p)->cs_buf); | |
| 189 return (0); | |
| 190 } | |
| 191 | |
| 192 void | |
| 193 mirror_child_init(md_mcs_t *cs) | |
| 194 { | |
| 195 cs->cs_ps = NULL; | |
| 196 cs->cs_mdunit = 0; | |
| 197 md_bioreset(&cs->cs_buf); | |
| 198 } | |
| 199 | |
| 200 /*ARGSUSED1*/ | |
| 201 static void | |
| 202 mirror_child_destructor(void *p, void *d) | |
| 203 { | |
| 204 biofini(&((md_mcs_t *)p)->cs_buf); | |
| 205 } | |
| 206 | |
| 207 static void | |
| 208 mirror_wowblk_init(wowhdr_t *p) | |
| 209 { | |
| 210 bzero(p, md_wowblk_size); | |
| 211 } | |
| 212 | |
| 213 static void | |
| 214 send_poke_hotspares_msg(daemon_request_t *drq) | |
| 215 { | |
| 216 int rval; | |
| 217 md_mn_msg_pokehsp_t pokehsp; | |
| 218 md_mn_kresult_t *kresult; | |
| 219 set_t setno = (set_t)drq->dq.qlen; | |
| 220 | |
| 221 pokehsp.pokehsp_setno = setno; | |
| 222 | |
| 223 kresult = kmem_alloc(sizeof (md_mn_kresult_t), KM_SLEEP); | |
| 224 rval = mdmn_ksend_message(setno, MD_MN_MSG_POKE_HOTSPARES, | |
| 225 MD_MSGF_NO_LOG | MD_MSGF_NO_BCAST, (char *)&pokehsp, | |
| 226 sizeof (pokehsp), kresult); | |
| 227 | |
| 228 if (!MDMN_KSEND_MSG_OK(rval, kresult)) { | |
| 229 mdmn_ksend_show_error(rval, kresult, "POKE_HOTSPARES"); | |
| 230 cmn_err(CE_PANIC, | |
| 231 "ksend_message failure: POKE_HOTSPARES"); | |
| 232 } | |
| 233 kmem_free(kresult, sizeof (md_mn_kresult_t)); | |
| 234 | |
| 235 /* Allow further requests to use this set's queue structure */ | |
| 236 mutex_enter(&drq->dr_mx); | |
| 237 drq->dr_pending = 0; | |
| 238 mutex_exit(&drq->dr_mx); | |
| 239 } | |
| 240 | |
| 241 /* | |
| 242 * Send a poke_hotspares message to the master node. To avoid swamping the | |
| 243 * commd handler with requests we only send a message if there is not one | |
| 244 * already outstanding. We punt the request to a separate thread context as | |
| 245 * cannot afford to block waiting on the request to be serviced. This is | |
| 246 * essential when a reconfig cycle is in progress as any open() of a multinode | |
| 247 * metadevice may result in a livelock. | |
| 248 */ | |
| 249 static void | |
| 250 send_poke_hotspares(set_t setno) | |
| 251 { | |
| 252 daemon_request_t *drq = &mn_hs_request[setno]; | |
| 253 | |
| 254 mutex_enter(&drq->dr_mx); | |
| 255 if (drq->dr_pending == 0) { | |
| 256 drq->dr_pending = 1; | |
| 257 drq->dq.qlen = (int)setno; | |
| 258 daemon_request(&md_mhs_daemon, | |
| 259 send_poke_hotspares_msg, (daemon_queue_t *)drq, REQ_OLD); | |
| 260 } | |
| 261 mutex_exit(&drq->dr_mx); | |
| 262 } | |
| 263 | |
| 264 void | |
| 265 mirror_set_sm_state( | |
| 266 mm_submirror_t *sm, | |
| 267 mm_submirror_ic_t *smic, | |
| 268 sm_state_t newstate, | |
| 269 int force) | |
| 270 { | |
| 271 int compcnt; | |
| 272 int i; | |
| 273 int errcnt; | |
| 274 sm_state_t origstate; | |
| 275 md_m_shared_t *shared; | |
| 276 | |
| 277 if (force) { | |
| 278 sm->sm_state = newstate; | |
| 279 uniqtime32(&sm->sm_timestamp); | |
| 280 return; | |
| 281 } | |
| 282 | |
| 283 origstate = newstate; | |
| 284 | |
| 285 compcnt = (*(smic->sm_get_component_count))(sm->sm_dev, sm); | |
| 286 for (i = 0, errcnt = 0; i < compcnt; i++) { | |
| 287 shared = (md_m_shared_t *)(*(smic->sm_shared_by_indx)) | |
| 288 (sm->sm_dev, sm, i); | |
| 289 if (shared->ms_state & (CS_ERRED | CS_LAST_ERRED)) | |
| 290 newstate |= SMS_COMP_ERRED; | |
| 291 if (shared->ms_state & (CS_RESYNC)) | |
| 292 newstate |= SMS_COMP_RESYNC; | |
| 293 if (shared->ms_state & CS_ERRED) | |
| 294 errcnt++; | |
| 295 } | |
| 296 | |
| 297 if ((newstate & (SMS_COMP_ERRED | SMS_COMP_RESYNC)) != 0) | |
| 298 newstate &= ~origstate; | |
| 299 | |
| 300 if (errcnt == compcnt) | |
| 301 newstate |= SMS_ALL_ERRED; | |
| 302 else | |
| 303 newstate &= ~SMS_ALL_ERRED; | |
| 304 | |
| 305 sm->sm_state = newstate; | |
| 306 uniqtime32(&sm->sm_timestamp); | |
| 307 } | |
| 308 | |
| 309 static int | |
| 310 mirror_geterror(mm_unit_t *un, int *smi, int *cip, int clr_error, | |
| 311 int frm_probe) | |
| 312 { | |
| 313 mm_submirror_t *sm; | |
| 314 mm_submirror_ic_t *smic; | |
| 315 md_m_shared_t *shared; | |
| 316 int ci; | |
| 317 int i; | |
| 318 int compcnt; | |
| 319 int open_comp; /* flag for open component */ | |
| 320 | |
| 321 for (i = *smi; i < NMIRROR; i++) { | |
| 322 sm = &un->un_sm[i]; | |
| 323 smic = &un->un_smic[i]; | |
| 324 | |
| 325 if (!SMS_IS(sm, SMS_INUSE)) | |
| 326 continue; | |
| 327 | |
| 328 compcnt = (*(smic->sm_get_component_count)) (sm->sm_dev, un); | |
| 329 for (ci = *cip; ci < compcnt; ci++) { | |
| 330 shared = (md_m_shared_t *)(*(smic->sm_shared_by_indx)) | |
| 331 (sm->sm_dev, sm, ci); | |
| 332 /* | |
| 333 * if called from any routine but probe, we check for | |
| 334 * MDM_S_ISOPEN flag. Since probe does a pseduo open, | |
| 335 * it sets MDM_S_PROBEOPEN flag and we test for this | |
| 336 * flag. They are both exclusive tests. | |
| 337 */ | |
| 338 open_comp = (frm_probe) ? | |
| 339 (shared->ms_flags & MDM_S_PROBEOPEN): | |
| 340 (shared->ms_flags & MDM_S_ISOPEN); | |
| 341 if ((shared->ms_flags & MDM_S_IOERR || !open_comp) && | |
| 342 ((shared->ms_state == CS_OKAY) || | |
| 343 (shared->ms_state == CS_RESYNC))) { | |
| 344 if (clr_error) { | |
| 345 shared->ms_flags &= ~MDM_S_IOERR; | |
| 346 } | |
| 347 *cip = ci; | |
| 348 *smi = i; | |
| 349 return (1); | |
| 350 } | |
| 351 | |
| 352 if (clr_error && (shared->ms_flags & MDM_S_IOERR)) { | |
| 353 shared->ms_flags &= ~MDM_S_IOERR; | |
| 354 } | |
| 355 } | |
| 356 | |
| 357 *cip = 0; | |
| 358 } | |
| 359 return (0); | |
| 360 } | |
| 361 | |
| 362 /*ARGSUSED*/ | |
| 363 static void | |
| 364 mirror_run_queue(void *d) | |
| 365 { | |
| 366 if (!(md_status & MD_GBL_DAEMONS_LIVE)) | |
| 367 md_daemon(1, &md_done_daemon); | |
| 368 } | |
| 369 /* | |
| 370 * check_comp_4_hotspares | |
| 371 * | |
| 372 * This function attempts to allocate a hotspare for this component if the | |
| 373 * component is in error. In a MN set, the function can be called in 2 modes. | |
| 374 * It can be called either when a component error has been detected or when a | |
| 375 * new hotspare has been allocated. In this case, MD_HOTSPARE_XMIT is set | |
| 376 * in flags and the request is sent to all nodes. | |
| 377 * The handler on each of the nodes then calls this function with | |
| 378 * MD_HOTSPARE_XMIT unset and the hotspare allocation is then performed. | |
| 379 * | |
| 380 * For non-MN sets the function simply attempts to allocate a hotspare. | |
| 381 * | |
| 382 * On entry, the following locks are held | |
| 383 * mirror_md_ops.md_link_rw (if flags has MD_HOTSPARE_LINKHELD set) | |
| 384 * md_unit_writerlock | |
| 385 * | |
| 386 * Returns 0 if ok | |
| 387 * 1 if the unit containing the component has been cleared while | |
| 388 * the mdmn_ksend_message() was being executed | |
| 389 */ | |
| 390 extern int | |
| 391 check_comp_4_hotspares( | |
| 392 mm_unit_t *un, | |
| 393 int smi, | |
| 394 int ci, | |
| 395 uint_t flags, | |
| 396 mddb_recid_t hs_id, /* Only used by MN disksets */ | |
| 397 IOLOCK *lockp /* can be NULL */ | |
| 398 ) | |
| 399 { | |
| 400 mm_submirror_t *sm; | |
| 401 mm_submirror_ic_t *smic; | |
| 402 md_m_shared_t *shared; | |
| 403 mddb_recid_t recids[6]; | |
| 404 minor_t mnum; | |
| 405 intptr_t (*hs_dev)(); | |
| 406 void (*hs_done)(); | |
| 407 void *hs_data; | |
| 408 md_error_t mde = mdnullerror; | |
| 409 set_t setno; | |
| 410 md_mn_msg_allochsp_t allochspmsg; | |
| 411 md_mn_kresult_t *kresult; | |
| 412 mm_unit_t *new_un; | |
| 413 int rval; | |
| 414 | |
| 415 mnum = MD_SID(un); | |
| 416 setno = MD_UN2SET(un); | |
| 417 sm = &un->un_sm[smi]; | |
| 418 smic = &un->un_smic[smi]; | |
| 419 shared = (md_m_shared_t *)(*(smic->sm_shared_by_indx)) | |
| 420 (sm->sm_dev, sm, ci); | |
| 421 | |
| 422 if (shared->ms_state != CS_ERRED) | |
| 423 return (0); | |
| 424 | |
| 425 /* Don't start a new component resync if a resync is already running. */ | |
| 426 if (MD_STATUS(un) & MD_UN_RESYNC_ACTIVE) | |
| 427 return (0); | |
| 428 | |
| 429 if (MD_MNSET_SETNO(setno) && (flags & MD_HOTSPARE_XMIT)) { | |
| 430 uint_t msgflags; | |
| 431 md_mn_msgtype_t msgtype; | |
| 432 | |
| 433 /* Send allocate hotspare message to all nodes */ | |
| 434 | |
| 435 allochspmsg.msg_allochsp_mnum = un->c.un_self_id; | |
| 436 allochspmsg.msg_allochsp_sm = smi; | |
| 437 allochspmsg.msg_allochsp_comp = ci; | |
| 438 allochspmsg.msg_allochsp_hs_id = shared->ms_hs_id; | |
| 439 | |
| 440 /* | |
| 441 * Before calling mdmn_ksend_message(), release locks | |
| 442 * Can never be in the context of an ioctl. | |
| 443 */ | |
| 444 md_unit_writerexit(MDI_UNIT(mnum)); | |
| 445 if (flags & MD_HOTSPARE_LINKHELD) | |
| 446 rw_exit(&mirror_md_ops.md_link_rw.lock); | |
| 447 #ifdef DEBUG | |
| 448 if (mirror_debug_flag) | |
| 449 printf("send alloc hotspare, flags=0x%x %x, %x, %x, %x\n", | |
| 450 flags, | |
| 451 allochspmsg.msg_allochsp_mnum, | |
| 452 allochspmsg.msg_allochsp_sm, | |
| 453 allochspmsg.msg_allochsp_comp, | |
| 454 allochspmsg.msg_allochsp_hs_id); | |
| 455 #endif | |
| 456 if (flags & MD_HOTSPARE_WMUPDATE) { | |
| 457 msgtype = MD_MN_MSG_ALLOCATE_HOTSPARE2; | |
| 458 /* | |
| 459 * When coming from an update of watermarks, there | |
| 460 * must already be a message logged that triggered | |
| 461 * this action. So, no need to log this message, too. | |
| 462 */ | |
| 463 msgflags = MD_MSGF_NO_LOG; | |
| 464 } else { | |
| 465 msgtype = MD_MN_MSG_ALLOCATE_HOTSPARE; | |
| 466 msgflags = MD_MSGF_DEFAULT_FLAGS; | |
| 467 } | |
| 468 | |
| 469 kresult = kmem_alloc(sizeof (md_mn_kresult_t), KM_SLEEP); | |
| 470 rval = mdmn_ksend_message(setno, msgtype, msgflags, | |
| 471 (char *)&allochspmsg, sizeof (allochspmsg), | |
| 472 kresult); | |
| 473 | |
| 474 if (!MDMN_KSEND_MSG_OK(rval, kresult)) { | |
| 475 #ifdef DEBUG | |
| 476 if (mirror_debug_flag) | |
| 477 mdmn_ksend_show_error(rval, kresult, | |
| 478 "ALLOCATE HOTSPARE"); | |
| 479 #endif | |
| 480 /* | |
| 481 * If message is sent ok but exitval indicates an error | |
| 482 * it must be because the mirror has been cleared. In | |
| 483 * this case re-obtain lock and return an error | |
| 484 */ | |
| 485 if ((rval == 0) && (kresult->kmmr_exitval != 0)) { | |
| 486 if (flags & MD_HOTSPARE_LINKHELD) { | |
| 487 rw_enter(&mirror_md_ops.md_link_rw.lock, | |
| 488 RW_READER); | |
| 489 } | |
| 490 kmem_free(kresult, sizeof (md_mn_kresult_t)); | |
| 491 return (1); | |
| 492 } | |
| 493 cmn_err(CE_PANIC, | |
| 494 "ksend_message failure: ALLOCATE_HOTSPARE"); | |
| 495 } | |
| 496 kmem_free(kresult, sizeof (md_mn_kresult_t)); | |
| 497 | |
| 498 /* | |
| 499 * re-obtain the locks | |
| 500 */ | |
| 501 if (flags & MD_HOTSPARE_LINKHELD) | |
| 502 rw_enter(&mirror_md_ops.md_link_rw.lock, RW_READER); | |
| 503 new_un = md_unit_writerlock(MDI_UNIT(mnum)); | |
| 504 | |
| 505 /* | |
| 506 * As we had to release the locks in order to send the | |
| 507 * message to all nodes, we need to check to see if the | |
| 508 * unit has changed. If it has we release the writerlock | |
| 509 * and return fail. | |
| 510 */ | |
| 511 if ((new_un != un) || (un->c.un_type != MD_METAMIRROR)) { | |
| 512 md_unit_writerexit(MDI_UNIT(mnum)); | |
| 513 return (1); | |
| 514 } | |
| 515 } else { | |
| 516 if (MD_MNSET_SETNO(setno)) { | |
| 517 /* | |
| 518 * If 2 or more nodes simultaneously see a | |
| 519 * component failure, these nodes will each | |
| 520 * send an ALLOCATE_HOTSPARE[2] message. | |
| 521 * The first message will allocate the hotspare | |
| 522 * and the subsequent messages should do nothing. | |
| 523 * | |
| 524 * If a slave node doesn't have a hotspare allocated | |
| 525 * at the time the message is initiated, then the | |
| 526 * passed in hs_id will be 0. If the node | |
| 527 * executing this routine has a component shared | |
| 528 * ms_hs_id of non-zero, but the message shows a | |
| 529 * hs_id of 0, then just return since a hotspare | |
| 530 * has already been allocated for this failing | |
| 531 * component. When the slave node returns from | |
| 532 * the ksend_message the hotspare will have | |
| 533 * already been allocated. | |
| 534 * | |
| 535 * If the slave node does send an hs_id of non-zero, | |
| 536 * and the slave node's hs_id matches this node's | |
| 537 * ms_hs_id, then the hotspare has error'd and | |
| 538 * should be replaced. | |
| 539 * | |
| 540 * If the slave node sends an hs_id of non-zero and | |
| 541 * this node has a different shared ms_hs_id, then | |
| 542 * just return since this hotspare has already | |
| 543 * been hotspared. | |
| 544 */ | |
| 545 if (shared->ms_hs_id != 0) { | |
| 546 if (hs_id == 0) { | |
| 547 #ifdef DEBUG | |
| 548 if (mirror_debug_flag) { | |
| 549 printf("check_comp_4_hotspares" | |
| 550 "(NOXMIT), short circuit " | |
| 551 "hs_id=0x%x, " | |
| 552 "ms_hs_id=0x%x\n", | |
| 553 hs_id, shared->ms_hs_id); | |
| 554 } | |
| 555 #endif | |
| 556 return (0); | |
| 557 } | |
| 558 if (hs_id != shared->ms_hs_id) { | |
| 559 #ifdef DEBUG | |
| 560 if (mirror_debug_flag) { | |
| 561 printf("check_comp_4_hotspares" | |
| 562 "(NOXMIT), short circuit2 " | |
| 563 "hs_id=0x%x, " | |
| 564 "ms_hs_id=0x%x\n", | |
| 565 hs_id, shared->ms_hs_id); | |
| 566 } | |
| 567 #endif | |
| 568 return (0); | |
| 569 } | |
| 570 } | |
| 571 } | |
| 572 | |
| 573 sm = &un->un_sm[smi]; | |
| 574 hs_dev = md_get_named_service(sm->sm_dev, 0, | |
| 575 "hotspare device", 0); | |
| 576 if ((*hs_dev)(sm->sm_dev, 0, ci, recids, 6, &hs_done, | |
| 577 &hs_data) != 0) | |
| 578 return (0); | |
| 579 | |
| 580 /* | |
| 581 * set_sm_comp_state() commits the modified records. | |
| 582 * As we don't transmit the changes, no need to drop the lock. | |
| 583 */ | |
| 584 set_sm_comp_state(un, smi, ci, CS_RESYNC, recids, | |
| 585 MD_STATE_NO_XMIT, (IOLOCK *)NULL); | |
| 586 | |
| 587 (*hs_done)(sm->sm_dev, hs_data); | |
| 588 | |
| 589 mirror_check_failfast(mnum); | |
| 590 | |
| 591 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_HOTSPARED, SVM_TAG_METADEVICE, | |
| 592 setno, MD_SID(un)); | |
| 593 | |
| 594 /* | |
| 595 * For a multi-node set we need to reset the un_rs_type, | |
| 596 * un_rs_resync_done and un_rs_resync_2_do fields as the | |
| 597 * hot-spare resync must copy all applicable data. | |
| 598 */ | |
| 599 if (MD_MNSET_SETNO(setno)) { | |
| 600 un->un_rs_type = MD_RS_NONE; | |
| 601 un->un_rs_resync_done = 0; | |
| 602 un->un_rs_resync_2_do = 0; | |
| 603 } | |
| 604 | |
| 605 /* | |
| 606 * Must drop writer lock since mirror_resync_unit will | |
| 607 * open devices and must be able to grab readerlock. | |
| 608 * Don't need to drop IOLOCK since any descendent routines | |
| 609 * calling ksend_messages will drop the IOLOCK as needed. | |
| 610 * | |
| 611 */ | |
| 612 if (lockp) { | |
| 613 md_ioctl_writerexit(lockp); | |
| 614 } else { | |
| 615 md_unit_writerexit(MDI_UNIT(mnum)); | |
| 616 } | |
| 617 | |
| 618 /* start resync */ | |
| 619 (void) mirror_resync_unit(mnum, NULL, &mde, lockp); | |
| 620 | |
| 621 if (lockp) { | |
| 622 new_un = md_ioctl_writerlock(lockp, MDI_UNIT(mnum)); | |
| 623 } else { | |
| 624 new_un = md_unit_writerlock(MDI_UNIT(mnum)); | |
| 625 } | |
| 626 } | |
| 627 return (0); | |
| 628 } | |
| 629 | |
| 630 /* | |
| 631 * check_unit_4_hotspares | |
| 632 * | |
| 633 * For a given mirror, allocate hotspares, if available for any components | |
| 634 * that are in error | |
| 635 * | |
| 636 * Returns 0 if ok | |
| 637 * 1 if check_comp_4_hotspares returns non-zero. This will only | |
| 638 * happen for a MN unit where the unit has been cleared while | |
| 639 * the allocate hotspare message is sent to all nodes. | |
| 640 */ | |
| 641 static int | |
| 642 check_unit_4_hotspares(mm_unit_t *un, int flags) | |
| 643 { | |
| 644 mm_submirror_t *sm; | |
| 645 mm_submirror_ic_t *smic; | |
| 646 int ci; | |
| 647 int i; | |
| 648 int compcnt; | |
| 649 | |
| 650 if (MD_STATUS(un) & MD_UN_RESYNC_ACTIVE) | |
| 651 return (0); | |
| 652 | |
| 653 for (i = 0; i < NMIRROR; i++) { | |
| 654 sm = &un->un_sm[i]; | |
| 655 smic = &un->un_smic[i]; | |
| 656 if (!SMS_IS(sm, SMS_INUSE)) | |
| 657 continue; | |
| 658 compcnt = (*(smic->sm_get_component_count)) (sm->sm_dev, sm); | |
| 659 for (ci = 0; ci < compcnt; ci++) { | |
| 660 md_m_shared_t *shared; | |
| 661 | |
| 662 shared = (md_m_shared_t *) | |
| 663 (*(smic->sm_shared_by_indx))(sm->sm_dev, | |
| 664 sm, ci); | |
| 665 /* | |
| 666 * Never called from ioctl context, so pass in | |
| 667 * (IOLOCK *)NULL. Pass through flags from calling | |
| 668 * routine, also setting XMIT flag. | |
| 669 */ | |
| 670 if (check_comp_4_hotspares(un, i, ci, | |
| 671 (MD_HOTSPARE_XMIT | flags), | |
| 672 shared->ms_hs_id, (IOLOCK *)NULL) != 0) | |
| 673 return (1); | |
| 674 } | |
| 675 } | |
| 676 return (0); | |
| 677 } | |
| 678 | |
| 679 static void | |
| 680 check_4_hotspares(daemon_request_t *drq) | |
| 681 { | |
| 682 mdi_unit_t *ui; | |
| 683 mm_unit_t *un; | |
| 684 md_link_t *next; | |
| 685 int x; | |
| 686 | |
| 687 mutex_enter(&drq->dr_mx); /* clear up front so can poke */ | |
| 688 drq->dr_pending = 0; /* again in low level routine if */ | |
| 689 mutex_exit(&drq->dr_mx); /* something found to do */ | |
| 690 | |
| 691 /* | |
| 692 * Used to have a problem here. The disksets weren't marked as being | |
| 693 * MNHOLD. This opened a window where we could be searching for | |
| 694 * hotspares and have the disk set unloaded (released) from under | |
| 695 * us causing a panic in stripe_component_count(). | |
| 696 * The way to prevent that is to mark the set MNHOLD which prevents | |
| 697 * any diskset from being released while we are scanning the mirrors, | |
| 698 * submirrors and components. | |
| 699 */ | |
| 700 | |
| 701 for (x = 0; x < md_nsets; x++) | |
| 702 md_holdset_enter(x); | |
| 703 | |
| 704 rw_enter(&mirror_md_ops.md_link_rw.lock, RW_READER); | |
| 705 for (next = mirror_md_ops.md_head; next != NULL; next = next->ln_next) { | |
| 706 ui = MDI_UNIT(next->ln_id); | |
| 707 | |
| 708 un = (mm_unit_t *)md_unit_readerlock(ui); | |
| 709 | |
| 710 /* | |
| 711 * Only check the unit if we are the master for this set | |
| 712 * For an MN set, poke_hotspares() is only effective on the | |
| 713 * master | |
| 714 */ | |
| 715 if (MD_MNSET_SETNO(MD_UN2SET(un)) && | |
| 716 md_set[MD_UN2SET(un)].s_am_i_master == 0) { | |
| 717 md_unit_readerexit(ui); | |
| 718 continue; | |
| 719 } | |
| 720 if (MD_STATUS(un) & MD_UN_RESYNC_ACTIVE) { | |
| 721 md_unit_readerexit(ui); | |
| 722 continue; | |
| 723 } | |
| 724 md_unit_readerexit(ui); | |
| 725 | |
| 726 un = (mm_unit_t *)md_unit_writerlock(ui); | |
| 727 /* | |
| 728 * check_unit_4_hotspares will exit 1 if the unit has been | |
| 729 * removed during the process of allocating the hotspare. | |
| 730 * This can only happen for a MN metadevice. If unit no longer | |
| 731 * exists, no need to release writerlock | |
| 732 */ | |
| 733 if (check_unit_4_hotspares(un, MD_HOTSPARE_LINKHELD) == 0) | |
| 734 md_unit_writerexit(ui); | |
| 735 else { | |
| 736 /* | |
| 737 * If check_unit_4_hotspares failed, queue another | |
| 738 * request and break out of this one | |
| 739 */ | |
| 740 (void) poke_hotspares(); | |
| 741 break; | |
| 742 } | |
| 743 } | |
| 744 rw_exit(&mirror_md_ops.md_link_rw.lock); | |
| 745 | |
| 746 for (x = 0; x < md_nsets; x++) | |
| 747 md_holdset_exit(x); | |
| 748 } | |
| 749 | |
| 750 /* | |
| 751 * poke_hotspares | |
| 752 * | |
| 753 * If there is not a pending poke_hotspares request pending, queue a requent | |
| 754 * to call check_4_hotspares(). This will scan all mirrors and attempt to | |
| 755 * allocate hotspares for all components in error. | |
| 756 */ | |
| 757 int | |
| 758 poke_hotspares() | |
| 759 { | |
| 760 mutex_enter(&hotspare_request.dr_mx); | |
| 761 if (hotspare_request.dr_pending == 0) { | |
| 762 hotspare_request.dr_pending = 1; | |
| 763 daemon_request(&md_mhs_daemon, | |
| 764 check_4_hotspares, | |
| 765 (daemon_queue_t *)&hotspare_request, REQ_OLD); | |
| 766 } | |
| 767 mutex_exit(&hotspare_request.dr_mx); | |
| 768 return (0); | |
| 769 } | |
| 770 | |
| 771 static void | |
| 772 free_all_ecomps(err_comp_t *ecomp) | |
| 773 { | |
| 774 err_comp_t *d; | |
| 775 | |
| 776 while (ecomp != NULL) { | |
| 777 d = ecomp; | |
| 778 ecomp = ecomp->ec_next; | |
| 779 kmem_free(d, sizeof (err_comp_t)); | |
| 780 } | |
| 781 } | |
| 782 | |
| 783 /* | |
| 784 * NAME: mirror_openfail_console_info | |
| 785 * | |
| 786 * DESCRIPTION: Prints a informative message to the console when mirror | |
| 787 * cannot be opened. | |
| 788 * | |
| 789 * PARAMETERS: mm_unit_t un - pointer to mirror unit structure | |
| 790 * int smi - submirror index | |
| 791 * int ci - component index | |
| 792 */ | |
| 793 | |
| 794 void | |
| 795 mirror_openfail_console_info(mm_unit_t *un, int smi, int ci) | |
| 796 { | |
| 797 void (*get_dev)(); | |
| 798 ms_cd_info_t cd; | |
| 799 md_dev64_t tmpdev; | |
| 800 | |
| 801 tmpdev = un->un_sm[smi].sm_dev; | |
| 802 get_dev = (void (*)())md_get_named_service(tmpdev, 0, "get device", 0); | |
| 803 if (get_dev != NULL) { | |
| 804 (void) (*get_dev)(tmpdev, smi, ci, &cd); | |
| 805 cmn_err(CE_WARN, "md %s: open error on %s", | |
| 806 md_shortname(MD_SID(un)), | |
| 807 md_devname(MD_UN2SET(un), cd.cd_dev, | |
| 808 NULL, 0)); | |
| 809 } else { | |
| 810 cmn_err(CE_WARN, "md %s: open error", | |
| 811 md_shortname(MD_SID(un))); | |
| 812 } | |
| 813 } | |
| 814 | |
| 815 static int | |
| 816 mirror_close_all_devs(mm_unit_t *un, int md_cflags) | |
| 817 { | |
| 818 int i; | |
| 819 md_dev64_t dev; | |
| 820 | |
| 821 for (i = 0; i < NMIRROR; i++) { | |
| 822 if (!SMS_BY_INDEX_IS(un, i, SMS_INUSE)) | |
| 823 continue; | |
| 824 dev = un->un_sm[i].sm_dev; | |
| 825 md_layered_close(dev, md_cflags); | |
| 826 } | |
| 827 return (0); | |
| 828 } | |
| 829 | |
| 830 /* | |
| 831 * Keep track of drivers that don't support failfast. We use this so that | |
| 832 * we only log one diagnostic message for each of these drivers, no matter | |
| 833 * how many times we run the mirror_check_failfast function. | |
| 834 * Return 1 if this is a new driver that does not support failfast, | |
| 835 * return 0 if we have already seen this non-failfast driver. | |
| 836 */ | |
| 837 static int | |
| 838 new_non_ff_driver(const char *s) | |
| 839 { | |
| 840 mutex_enter(&non_ff_drv_mutex); | |
| 841 if (non_ff_drivers == NULL) { | |
| 842 non_ff_drivers = (char **)kmem_alloc(2 * sizeof (char *), | |
| 843 KM_NOSLEEP); | |
| 844 if (non_ff_drivers == NULL) { | |
| 845 mutex_exit(&non_ff_drv_mutex); | |
| 846 return (1); | |
| 847 } | |
| 848 | |
| 849 non_ff_drivers[0] = (char *)kmem_alloc(strlen(s) + 1, KM_NOSLEEP); | |
| 850 if (non_ff_drivers[0] == NULL) { | |
| 851 kmem_free(non_ff_drivers, 2 * sizeof (char *)); | |
| 852 non_ff_drivers = NULL; | |
| 853 mutex_exit(&non_ff_drv_mutex); | |
| 854 return (1); | |
| 855 } | |
| 856 | |
| 857 (void) strcpy(non_ff_drivers[0], s); | |
| 858 non_ff_drivers[1] = NULL; | |
| 859 | |
| 860 } else { | |
| 861 int i; | |
| 862 char **tnames; | |
| 863 char **tmp; | |
| 864 | |
| 865 for (i = 0; non_ff_drivers[i] != NULL; i++) { | |
| 866 if (strcmp(s, non_ff_drivers[i]) == 0) { | |
| 867 mutex_exit(&non_ff_drv_mutex); | |
| 868 return (0); | |
| 869 } | |
| 870 } | |
| 871 | |
| 872 /* allow for new element and null */ | |
| 873 i += 2; | |
| 874 tnames = (char **)kmem_alloc(i * sizeof (char *), KM_NOSLEEP); | |
| 875 if (tnames == NULL) { | |
| 876 mutex_exit(&non_ff_drv_mutex); | |
| 877 return (1); | |
| 878 } | |
| 879 | |
| 880 for (i = 0; non_ff_drivers[i] != NULL; i++) | |
| 881 tnames[i] = non_ff_drivers[i]; | |
| 882 | |
| 883 tnames[i] = (char *)kmem_alloc(strlen(s) + 1, KM_NOSLEEP); | |
| 884 if (tnames[i] == NULL) { | |
| 885 /* adjust i so that it is the right count to free */ | |
| 886 kmem_free(tnames, (i + 2) * sizeof (char *)); | |
| 887 mutex_exit(&non_ff_drv_mutex); | |
| 888 return (1); | |
| 889 } | |
| 890 | |
| 891 (void) strcpy(tnames[i++], s); | |
| 892 tnames[i] = NULL; | |
| 893 | |
| 894 tmp = non_ff_drivers; | |
| 895 non_ff_drivers = tnames; | |
| 896 /* i now represents the count we previously alloced */ | |
| 897 kmem_free(tmp, i * sizeof (char *)); | |
| 898 } | |
| 899 mutex_exit(&non_ff_drv_mutex); | |
| 900 | |
| 901 return (1); | |
| 902 } | |
| 903 | |
| 904 /* | |
| 905 * Check for the "ddi-failfast-supported" devtree property on each submirror | |
| 906 * component to indicate if we should do I/O to that submirror with the | |
| 907 * B_FAILFAST flag set or not. This check is made at various state transitions | |
| 908 * in the mirror code (e.g. open, enable, hotspare, etc.). Sometimes we | |
| 909 * only need to check one drive (e.g. hotspare) but since the check is | |
| 910 * fast and infrequent and sometimes needs to be done on all components we | |
| 911 * just check all components on each call. | |
| 912 */ | |
| 913 void | |
| 914 mirror_check_failfast(minor_t mnum) | |
| 915 { | |
| 916 int i; | |
| 917 mm_unit_t *un; | |
| 918 | |
| 919 if (md_ff_disable) | |
| 920 return; | |
| 921 | |
| 922 un = MD_UNIT(mnum); | |
| 923 | |
| 924 for (i = 0; i < NMIRROR; i++) { | |
| 925 int ci; | |
| 926 int cnt; | |
| 927 int ff = 1; | |
| 928 mm_submirror_t *sm; | |
| 929 mm_submirror_ic_t *smic; | |
| 930 void (*get_dev)(); | |
| 931 | |
| 932 if (!SMS_BY_INDEX_IS(un, i, SMS_INUSE)) | |
| 933 continue; | |
| 934 | |
| 935 sm = &un->un_sm[i]; | |
| 936 smic = &un->un_smic[i]; | |
| 937 | |
| 938 get_dev = (void (*)())md_get_named_service(sm->sm_dev, 0, | |
| 939 "get device", 0); | |
| 940 | |
| 941 cnt = (*(smic->sm_get_component_count))(sm->sm_dev, sm); | |
| 942 for (ci = 0; ci < cnt; ci++) { | |
| 943 int found = 0; | |
| 944 dev_t ci_dev; | |
| 945 major_t major; | |
| 946 dev_info_t *devi; | |
| 947 ms_cd_info_t cd; | |
| 948 | |
| 949 /* this already returns the hs dev if the device is spared */ | |
| 950 (void) (*get_dev)(sm->sm_dev, sm, ci, &cd); | |
| 951 | |
| 952 ci_dev = md_dev64_to_dev(cd.cd_dev); | |
| 953 major = getmajor(ci_dev); | |
| 954 | |
| 955 if (major == md_major) { | |
| 956 /* this component must be a soft partition; get real dev */ | |
| 957 minor_t dev_mnum; | |
| 958 mdi_unit_t *ui; | |
| 959 mp_unit_t *un; | |
| 960 set_t setno; | |
| 961 side_t side; | |
| 962 md_dev64_t tmpdev; | |
| 963 | |
| 964 ui = MDI_UNIT(getminor(ci_dev)); | |
| 965 | |
| 966 /* grab necessary lock */ | |
| 967 un = (mp_unit_t *)md_unit_readerlock(ui); | |
| 968 | |
| 969 dev_mnum = MD_SID(un); | |
| 970 setno = MD_MIN2SET(dev_mnum); | |
| 971 side = mddb_getsidenum(setno); | |
| 972 | |
| 973 tmpdev = un->un_dev; | |
| 974 | |
| 975 /* Get dev by device id */ | |
| 976 if (md_devid_found(setno, side, un->un_key) == 1) { | |
| 977 tmpdev = md_resolve_bydevid(dev_mnum, tmpdev, | |
| 978 un->un_key); | |
| 979 } | |
| 980 | |
| 981 md_unit_readerexit(ui); | |
| 982 | |
| 983 ci_dev = md_dev64_to_dev(tmpdev); | |
| 984 major = getmajor(ci_dev); | |
| 985 } | |
| 986 | |
| 987 if (ci_dev != NODEV32 && | |
| 988 (devi = e_ddi_hold_devi_by_dev(ci_dev, 0)) != NULL) { | |
| 989 ddi_prop_op_t prop_op = PROP_LEN_AND_VAL_BUF; | |
| 990 int propvalue = 0; | |
| 991 int proplength = sizeof (int); | |
| 992 int error; | |
| 993 struct cb_ops *cb; | |
| 994 | |
| 995 if ((cb = devopsp[major]->devo_cb_ops) != NULL) { | |
| 996 error = (*cb->cb_prop_op)(DDI_DEV_T_ANY, devi, prop_op, | |
| 997 DDI_PROP_NOTPROM|DDI_PROP_DONTPASS, | |
| 998 "ddi-failfast-supported", | |
| 999 (caddr_t)&propvalue, &proplength); | |
| 1000 | |
| 1001 if (error == DDI_PROP_SUCCESS) | |
| 1002 found = 1; | |
| 1003 } | |
| 1004 | |
| 1005 if (!found && new_non_ff_driver(ddi_driver_name(devi))) | |
| 1006 cmn_err(CE_NOTE, "!md: B_FAILFAST I/O disabled on %s", | |
| 1007 ddi_driver_name(devi)); | |
| 1008 | |
| 1009 ddi_release_devi(devi); | |
| 1010 } | |
| 1011 | |
| 1012 /* All components must support failfast in the submirror. */ | |
| 1013 if (!found) { | |
| 1014 ff = 0; | |
| 1015 break; | |
| 1016 } | |
| 1017 } | |
| 1018 | |
| 1019 if (ff) { | |
| 1020 sm->sm_flags |= MD_SM_FAILFAST; | |
| 1021 } else { | |
| 1022 sm->sm_flags &= ~MD_SM_FAILFAST; | |
| 1023 } | |
| 1024 } | |
| 1025 } | |
| 1026 | |
| 1027 /* | |
| 1028 * Return true if the submirror is unavailable. | |
| 1029 * If any of the submirror components are opened then the submirror cannot | |
| 1030 * be unavailable (MD_INACCESSIBLE). | |
| 1031 * If any of the components are already in the errored state, then the submirror | |
| 1032 * cannot be unavailable (MD_INACCESSIBLE). | |
| 1033 */ | |
| 1034 static bool_t | |
| 1035 submirror_unavailable(mm_unit_t *un, int smi, int from_probe) | |
| 1036 { | |
| 1037 mm_submirror_t *sm; | |
| 1038 mm_submirror_ic_t *smic; | |
| 1039 md_m_shared_t *shared; | |
| 1040 int ci; | |
| 1041 int compcnt; | |
| 1042 | |
| 1043 sm = &un->un_sm[smi]; | |
| 1044 smic = &un->un_smic[smi]; | |
| 1045 | |
| 1046 compcnt = (*(smic->sm_get_component_count)) (sm->sm_dev, un); | |
| 1047 for (ci = 0; ci < compcnt; ci++) { | |
| 1048 shared = (md_m_shared_t *)(*(smic->sm_shared_by_indx)) | |
| 1049 (sm->sm_dev, sm, ci); | |
| 1050 if (from_probe) { | |
| 1051 if (shared->ms_flags & MDM_S_PROBEOPEN) | |
| 1052 return (B_FALSE); | |
| 1053 } else { | |
| 1054 if (shared->ms_flags & MDM_S_ISOPEN) | |
| 1055 return (B_FALSE); | |
| 1056 } | |
| 1057 if (shared->ms_state == CS_ERRED || | |
| 1058 shared->ms_state == CS_LAST_ERRED) | |
| 1059 return (B_FALSE); | |
| 1060 } | |
| 1061 | |
| 1062 return (B_TRUE); | |
| 1063 } | |
| 1064 | |
| 1065 static int | |
| 1066 mirror_open_all_devs(minor_t mnum, int md_oflags, IOLOCK *lockp) | |
| 1067 { | |
| 1068 int i; | |
| 1069 mm_unit_t *un; | |
| 1070 mdi_unit_t *ui; | |
| 1071 int err; | |
| 1072 int smi; | |
| 1073 int ci; | |
| 1074 err_comp_t *c; | |
| 1075 err_comp_t *ecomps = NULL; | |
| 1076 int smmask = 0; | |
| 1077 set_t setno; | |
| 1078 int sm_cnt; | |
| 1079 int sm_unavail_cnt; | |
| 1080 | |
| 1081 mirror_check_failfast(mnum); | |
| 1082 | |
| 1083 un = MD_UNIT(mnum); | |
| 1084 ui = MDI_UNIT(mnum); | |
| 1085 setno = MD_UN2SET(un); | |
| 1086 | |
| 1087 for (i = 0; i < NMIRROR; i++) { | |
| 1088 md_dev64_t tmpdev = un->un_sm[i].sm_dev; | |
| 1089 | |
| 1090 if (!SMS_BY_INDEX_IS(un, i, SMS_INUSE)) | |
| 1091 continue; | |
| 1092 if (md_layered_open(mnum, &tmpdev, md_oflags)) | |
| 1093 smmask |= SMI2BIT(i); | |
| 1094 un->un_sm[i].sm_dev = tmpdev; | |
| 1095 } | |
| 1096 | |
| 1097 /* | |
| 1098 * If smmask is clear, all submirrors are accessible. Clear the | |
| 1099 * MD_INACCESSIBLE bit in this case. This bit is also cleared for the | |
| 1100 * mirror device. If smmask is set, we have to determine which of the | |
| 1101 * submirrors are in error. If no submirror is accessible we mark the | |
| 1102 * whole mirror as MD_INACCESSIBLE. | |
| 1103 */ | |
| 1104 if (smmask == 0) { | |
| 1105 if (lockp) { | |
| 1106 md_ioctl_readerexit(lockp); | |
| 1107 (void) md_ioctl_writerlock(lockp, ui); | |
| 1108 } else { | |
| 1109 md_unit_readerexit(ui); | |
| 1110 (void) md_unit_writerlock(ui); | |
| 1111 } | |
| 1112 ui->ui_tstate &= ~MD_INACCESSIBLE; | |
| 1113 if (lockp) { | |
| 1114 md_ioctl_writerexit(lockp); | |
| 1115 (void) md_ioctl_readerlock(lockp, ui); | |
| 1116 } else { | |
| 1117 md_unit_writerexit(ui); | |
| 1118 (void) md_unit_readerlock(ui); | |
| 1119 } | |
| 1120 | |
| 1121 for (i = 0; i < NMIRROR; i++) { | |
| 1122 md_dev64_t tmpdev; | |
| 1123 mdi_unit_t *sm_ui; | |
| 1124 | |
| 1125 if (!SMS_BY_INDEX_IS(un, i, SMS_INUSE)) | |
| 1126 continue; | |
| 1127 | |
| 1128 tmpdev = un->un_sm[i].sm_dev; | |
| 1129 sm_ui = MDI_UNIT(getminor(md_dev64_to_dev(tmpdev))); | |
| 1130 (void) md_unit_writerlock(sm_ui); | |
| 1131 sm_ui->ui_tstate &= ~MD_INACCESSIBLE; | |
| 1132 md_unit_writerexit(sm_ui); | |
| 1133 } | |
| 1134 | |
| 1135 return (0); | |
| 1136 } | |
| 1137 | |
| 1138 for (i = 0; i < NMIRROR; i++) { | |
| 1139 md_dev64_t tmpdev; | |
| 1140 | |
| 1141 if (!(smmask & SMI2BIT(i))) | |
| 1142 continue; | |
| 1143 | |
| 1144 tmpdev = un->un_sm[i].sm_dev; | |
| 1145 err = md_layered_open(mnum, &tmpdev, MD_OFLG_CONT_ERRS); | |
| 1146 un->un_sm[i].sm_dev = tmpdev; | |
| 1147 ASSERT(err == 0); | |
| 1148 } | |
| 1149 | |
| 1150 if (lockp) { | |
| 1151 md_ioctl_readerexit(lockp); | |
| 1152 un = (mm_unit_t *)md_ioctl_writerlock(lockp, ui); | |
| 1153 } else { | |
| 1154 md_unit_readerexit(ui); | |
| 1155 un = (mm_unit_t *)md_unit_writerlock(ui); | |
| 1156 } | |
| 1157 | |
| 1158 /* | |
| 1159 * We want to make sure the unavailable flag is not masking a real | |
| 1160 * error on the submirror. | |
| 1161 * For each submirror, | |
| 1162 * if all of the submirror components couldn't be opened and there | |
| 1163 * are no errors on the submirror, then set the unavailable flag | |
| 1164 * otherwise, clear unavailable. | |
| 1165 */ | |
| 1166 sm_cnt = 0; | |
| 1167 sm_unavail_cnt = 0; | |
| 1168 for (i = 0; i < NMIRROR; i++) { | |
| 1169 md_dev64_t tmpdev; | |
| 1170 mdi_unit_t *sm_ui; | |
| 1171 | |
| 1172 if (!SMS_BY_INDEX_IS(un, i, SMS_INUSE)) | |
| 1173 continue; | |
| 1174 | |
| 1175 sm_cnt++; | |
| 1176 tmpdev = un->un_sm[i].sm_dev; | |
| 1177 sm_ui = MDI_UNIT(getminor(md_dev64_to_dev(tmpdev))); | |
| 1178 | |
| 1179 (void) md_unit_writerlock(sm_ui); | |
| 1180 if (submirror_unavailable(un, i, 0)) { | |
| 1181 sm_ui->ui_tstate |= MD_INACCESSIBLE; | |
| 1182 sm_unavail_cnt++; | |
| 1183 } else { | |
| 1184 sm_ui->ui_tstate &= ~MD_INACCESSIBLE; | |
| 1185 } | |
| 1186 md_unit_writerexit(sm_ui); | |
| 1187 } | |
| 1188 | |
| 1189 /* | |
| 1190 * If all of the submirrors are unavailable, the mirror is also | |
| 1191 * unavailable. | |
| 1192 */ | |
| 1193 if (sm_cnt == sm_unavail_cnt) { | |
| 1194 ui->ui_tstate |= MD_INACCESSIBLE; | |
| 1195 } else { | |
| 1196 ui->ui_tstate &= ~MD_INACCESSIBLE; | |
| 1197 } | |
| 1198 | |
| 1199 smi = 0; | |
| 1200 ci = 0; | |
| 1201 while (mirror_geterror(un, &smi, &ci, 1, 0) != 0) { | |
| 1202 if (mirror_other_sources(un, smi, ci, 1) == 1) { | |
| 1203 | |
| 1204 free_all_ecomps(ecomps); | |
| 1205 (void) mirror_close_all_devs(un, md_oflags); | |
| 1206 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_OPEN_FAIL, | |
| 1207 SVM_TAG_METADEVICE, setno, MD_SID(un)); | |
| 1208 mirror_openfail_console_info(un, smi, ci); | |
| 1209 if (lockp) { | |
| 1210 md_ioctl_writerexit(lockp); | |
| 1211 (void) md_ioctl_readerlock(lockp, ui); | |
| 1212 } else { | |
| 1213 md_unit_writerexit(ui); | |
| 1214 (void) md_unit_readerlock(ui); | |
| 1215 } | |
| 1216 return (ENXIO); | |
| 1217 } | |
| 1218 | |
| 1219 /* track all component states that need changing */ | |
| 1220 c = (err_comp_t *)kmem_alloc(sizeof (err_comp_t), KM_SLEEP); | |
| 1221 c->ec_next = ecomps; | |
| 1222 c->ec_smi = smi; | |
| 1223 c->ec_ci = ci; | |
| 1224 ecomps = c; | |
| 1225 ci++; | |
| 1226 } | |
| 1227 | |
| 1228 /* Make all state changes and commit them */ | |
| 1229 for (c = ecomps; c != NULL; c = c->ec_next) { | |
| 1230 /* | |
| 1231 * If lockp is set, then entering kernel through ioctl. | |
| 1232 * For a MN set, the only ioctl path is via a commd message | |
| 1233 * (ALLOCATE_HOTSPARE or *RESYNC* messages) that is already | |
| 1234 * being sent to each node. | |
| 1235 * In this case, set NO_XMIT so that set_sm_comp_state | |
| 1236 * won't attempt to send a message on a message. | |
| 1237 * | |
| 1238 * In !MN sets, the xmit flag is ignored, so it doesn't matter | |
| 1239 * which flag is passed. | |
| 1240 */ | |
| 1241 if (lockp) { | |
| 1242 set_sm_comp_state(un, c->ec_smi, c->ec_ci, CS_ERRED, 0, | |
| 1243 MD_STATE_NO_XMIT, lockp); | |
| 1244 } else { | |
| 1245 set_sm_comp_state(un, c->ec_smi, c->ec_ci, CS_ERRED, 0, | |
| 1246 (MD_STATE_XMIT | MD_STATE_OCHELD), lockp); | |
| 1247 } | |
| 1248 /* | |
| 1249 * For a MN set, the NOTIFY is done when the state change is | |
| 1250 * processed on each node | |
| 1251 */ | |
| 1252 if (!MD_MNSET_SETNO(setno)) { | |
| 1253 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_ERRED, | |
| 1254 SVM_TAG_METADEVICE, setno, MD_SID(un)); | |
| 1255 } | |
| 1256 } | |
| 1257 | |
| 1258 if (lockp) { | |
| 1259 md_ioctl_writerexit(lockp); | |
| 1260 (void) md_ioctl_readerlock(lockp, ui); | |
| 1261 } else { | |
| 1262 md_unit_writerexit(ui); | |
| 1263 (void) md_unit_readerlock(ui); | |
| 1264 } | |
| 1265 | |
| 1266 free_all_ecomps(ecomps); | |
| 1267 | |
| 1268 /* allocate hotspares for all errored components */ | |
| 1269 if (MD_MNSET_SETNO(setno)) { | |
| 1270 /* | |
| 1271 * If we're called from an ioctl (lockp set) then we cannot | |
| 1272 * directly call send_poke_hotspares as this will block until | |
| 1273 * the message gets despatched to all nodes. If the cluster is | |
| 1274 * going through a reconfig cycle then the message will block | |
| 1275 * until the cycle is complete, and as we originate from a | |
| 1276 * service call from commd we will livelock. | |
| 1277 */ | |
| 1278 if (lockp == NULL) { | |
| 1279 md_unit_readerexit(ui); | |
| 1280 send_poke_hotspares(setno); | |
| 1281 (void) md_unit_readerlock(ui); | |
| 1282 } | |
| 1283 } else { | |
| 1284 (void) poke_hotspares(); | |
| 1285 } | |
| 1286 return (0); | |
| 1287 } | |
| 1288 | |
| 1289 void | |
| 1290 mirror_overlap_chain_remove(md_mps_t *ps) | |
| 1291 { | |
| 1292 mm_unit_t *un; | |
| 1293 | |
| 1294 if (panicstr) | |
| 1295 return; | |
| 1296 | |
| 1297 ASSERT(ps->ps_flags & MD_MPS_ON_OVERLAP); | |
| 1298 | |
| 1299 un = ps->ps_un; | |
| 1300 | |
| 1301 mutex_enter(&un->un_ovrlap_chn_mx); | |
| 1302 if (ps->ps_ovrlap_prev != &un->un_ovrlap_chn) | |
| 1303 ps->ps_ovrlap_prev->ps_ovrlap_next = ps->ps_ovrlap_next; | |
| 1304 else | |
| 1305 un->un_ovrlap_chn.ps_ovrlap_next = ps->ps_ovrlap_next; | |
| 1306 if (ps->ps_ovrlap_next != &un->un_ovrlap_chn) | |
| 1307 ps->ps_ovrlap_next->ps_ovrlap_prev = ps->ps_ovrlap_prev; | |
| 1308 else | |
| 1309 un->un_ovrlap_chn.ps_ovrlap_prev = ps->ps_ovrlap_prev; | |
| 1310 /* Handle empty overlap chain */ | |
| 1311 if (un->un_ovrlap_chn.ps_ovrlap_prev == &un->un_ovrlap_chn) { | |
| 1312 un->un_ovrlap_chn.ps_ovrlap_prev = | |
| 1313 un->un_ovrlap_chn.ps_ovrlap_next = NULL; | |
| 1314 } | |
| 1315 if (un->un_ovrlap_chn_flg) { | |
| 1316 un->un_ovrlap_chn_flg = 0; | |
| 1317 cv_broadcast(&un->un_ovrlap_chn_cv); | |
| 1318 } | |
| 1319 ps->ps_flags &= ~MD_MPS_ON_OVERLAP; | |
| 1320 mutex_exit(&un->un_ovrlap_chn_mx); | |
| 1321 } | |
| 1322 | |
| 1323 | |
| 1324 /* | |
| 1325 * wait_for_overlaps: | |
| 1326 * ----------------- | |
| 1327 * Check that given i/o request does not cause an overlap with already pending | |
| 1328 * i/o. If it does, block until the overlapped i/o completes. | |
| 1329 * | |
| 1330 * Note: the overlap chain is held as a monotonically increasing doubly-linked | |
| 1331 * list with the sentinel contained in un->un_ovrlap_chn. We avoid a linear | |
| 1332 * search of the list by the following logic: | |
| 1333 * ps->ps_lastblk < un_ovrlap_chn.ps_ovrlap_next->ps_firstblk => No overlap | |
| 1334 * ps->ps_firstblk > un_ovrlap_chn.ps_ovrlap_prev->ps_lastblk => No overlap | |
| 1335 * otherwise | |
| 1336 * scan un_ovrlap_chn.ps_ovrlap_next for location where ps->ps_firstblk | |
| 1337 * > chain->ps_lastblk. This is the insertion point. As the list is | |
| 1338 * guaranteed to be ordered there is no need to continue scanning. | |
| 1339 * | |
| 1340 * The flag argument has MD_OVERLAP_ALLOW_REPEAT set if it is ok for the parent | |
| 1341 * structure to be already on the overlap chain and MD_OVERLAP_NO_REPEAT | |
| 1342 * if it must not already be on the chain | |
| 1343 */ | |
| 1344 static void | |
| 1345 wait_for_overlaps(md_mps_t *ps, int flags) | |
| 1346 { | |
| 1347 mm_unit_t *un; | |
| 1348 md_mps_t *ps1, **head, **tail; | |
| 1349 | |
| 1350 if (panicstr) | |
| 1351 return; | |
| 1352 | |
| 1353 | |
| 1354 un = ps->ps_un; | |
| 1355 | |
| 1356 mutex_enter(&un->un_ovrlap_chn_mx); | |
| 1357 if ((flags & MD_OVERLAP_ALLOW_REPEAT) && | |
| 1358 (ps->ps_flags & MD_MPS_ON_OVERLAP)) { | |
| 1359 mutex_exit(&un->un_ovrlap_chn_mx); | |
| 1360 return; | |
| 1361 } | |
| 1362 | |
| 1363 ASSERT(!(ps->ps_flags & MD_MPS_ON_OVERLAP)); | |
| 1364 head = &(un->un_ovrlap_chn.ps_ovrlap_next); | |
| 1365 tail = &(un->un_ovrlap_chn.ps_ovrlap_prev); | |
| 1366 ps1 = *head; | |
| 1367 /* | |
| 1368 * Check for simple limit cases: | |
| 1369 * *head == NULL | |
| 1370 * insert ps at head of list | |
| 1371 * lastblk < head->firstblk | |
| 1372 * insert at head of list | |
| 1373 * firstblk > tail->lastblk | |
| 1374 * insert at tail of list | |
| 1375 */ | |
| 1376 if (ps1 == NULL) { | |
| 1377 /* Insert at head */ | |
| 1378 ps->ps_ovrlap_next = &un->un_ovrlap_chn; | |
| 1379 ps->ps_ovrlap_prev = &un->un_ovrlap_chn; | |
| 1380 *head = ps; | |
| 1381 *tail = ps; | |
| 1382 ps->ps_flags |= MD_MPS_ON_OVERLAP; | |
| 1383 mutex_exit(&un->un_ovrlap_chn_mx); | |
| 1384 return; | |
| 1385 } else if (ps->ps_lastblk < (*head)->ps_firstblk) { | |
| 1386 /* Insert at head */ | |
| 1387 ps->ps_ovrlap_next = (*head); | |
| 1388 ps->ps_ovrlap_prev = &un->un_ovrlap_chn; | |
| 1389 (*head)->ps_ovrlap_prev = ps; | |
| 1390 *head = ps; | |
| 1391 ps->ps_flags |= MD_MPS_ON_OVERLAP; | |
| 1392 mutex_exit(&un->un_ovrlap_chn_mx); | |
| 1393 return; | |
| 1394 } else if (ps->ps_firstblk > (*tail)->ps_lastblk) { | |
| 1395 /* Insert at tail */ | |
| 1396 ps->ps_ovrlap_prev = (*tail); | |
| 1397 ps->ps_ovrlap_next = &un->un_ovrlap_chn; | |
| 1398 (*tail)->ps_ovrlap_next = ps; | |
| 1399 *tail = ps; | |
| 1400 ps->ps_flags |= MD_MPS_ON_OVERLAP; | |
| 1401 mutex_exit(&un->un_ovrlap_chn_mx); | |
| 1402 return; | |
| 1403 } | |
| 1404 /* Now we have to scan the list for possible overlaps */ | |
| 1405 while (ps1 != NULL) { | |
| 1406 /* | |
| 1407 * If this region has been put on the chain by another thread | |
| 1408 * just exit | |
| 1409 */ | |
| 1410 if ((flags & MD_OVERLAP_ALLOW_REPEAT) && | |
| 1411 (ps->ps_flags & MD_MPS_ON_OVERLAP)) { | |
| 1412 mutex_exit(&un->un_ovrlap_chn_mx); | |
| 1413 return; | |
| 1414 | |
| 1415 } | |
| 1416 for (ps1 = *head; ps1 && (ps1 != &un->un_ovrlap_chn); | |
| 1417 ps1 = ps1->ps_ovrlap_next) { | |
| 1418 if (ps->ps_firstblk > (*tail)->ps_lastblk) { | |
| 1419 /* Insert at tail */ | |
| 1420 ps->ps_ovrlap_prev = (*tail); | |
| 1421 ps->ps_ovrlap_next = &un->un_ovrlap_chn; | |
| 1422 (*tail)->ps_ovrlap_next = ps; | |
| 1423 *tail = ps; | |
| 1424 ps->ps_flags |= MD_MPS_ON_OVERLAP; | |
| 1425 mutex_exit(&un->un_ovrlap_chn_mx); | |
| 1426 return; | |
| 1427 } | |
| 1428 if (ps->ps_firstblk > ps1->ps_lastblk) | |
| 1429 continue; | |
| 1430 if (ps->ps_lastblk < ps1->ps_firstblk) { | |
| 1431 /* Insert into list at current 'ps1' position */ | |
| 1432 ps->ps_ovrlap_next = ps1; | |
| 1433 ps->ps_ovrlap_prev = ps1->ps_ovrlap_prev; | |
| 1434 ps1->ps_ovrlap_prev->ps_ovrlap_next = ps; | |
| 1435 ps1->ps_ovrlap_prev = ps; | |
| 1436 ps->ps_flags |= MD_MPS_ON_OVERLAP; | |
| 1437 mutex_exit(&un->un_ovrlap_chn_mx); | |
| 1438 return; | |
| 1439 } | |
| 1440 break; | |
| 1441 } | |
| 1442 if (ps1 != NULL) { | |
| 1443 un->un_ovrlap_chn_flg = 1; | |
| 1444 cv_wait(&un->un_ovrlap_chn_cv, &un->un_ovrlap_chn_mx); | |
| 1445 /* | |
| 1446 * Now ps1 refers to the old insertion point and we | |
| 1447 * have to check the whole chain to see if we're still | |
| 1448 * overlapping any other i/o. | |
| 1449 */ | |
| 1450 } | |
| 1451 } | |
| 1452 | |
| 1453 /* | |
| 1454 * Only get here if we had one overlapping i/o on the list and that | |
| 1455 * has now completed. In this case the list is empty so we insert <ps> | |
| 1456 * at the head of the chain. | |
| 1457 */ | |
| 1458 ASSERT(*head == NULL); | |
| 1459 *tail = *head = ps; | |
| 1460 ps->ps_ovrlap_next = ps->ps_ovrlap_prev = &un->un_ovrlap_chn; | |
| 1461 ps->ps_flags |= MD_MPS_ON_OVERLAP; | |
| 1462 mutex_exit(&un->un_ovrlap_chn_mx); | |
| 1463 } | |
| 1464 | |
| 1465 /* | |
| 1466 * This function is called from mirror_done to check whether any pages have | |
| 1467 * been modified while a mirrored write was in progress. Returns 0 if | |
| 1468 * all pages associated with bp are clean, 1 otherwise. | |
| 1469 */ | |
| 1470 static int | |
| 1471 any_pages_dirty(struct buf *bp) | |
| 1472 { | |
| 1473 int rval; | |
| 1474 | |
| 1475 rval = biomodified(bp); | |
| 1476 if (rval == -1) | |
| 1477 rval = 0; | |
| 1478 | |
| 1479 return (rval); | |
| 1480 } | |
| 1481 | |
| 1482 #define MAX_EXTRAS 10 | |
| 1483 | |
| 1484 void | |
| 1485 mirror_commit( | |
| 1486 mm_unit_t *un, | |
| 1487 int smmask, | |
| 1488 mddb_recid_t *extras | |
| 1489 ) | |
| 1490 { | |
| 1491 mm_submirror_t *sm; | |
| 1492 md_unit_t *su; | |
| 1493 int i; | |
| 1494 | |
| 1495 /* 2=mirror,null id */ | |
| 1496 mddb_recid_t recids[NMIRROR+2+MAX_EXTRAS]; | |
| 1497 | |
| 1498 int ri = 0; | |
| 1499 | |
| 1500 if (md_get_setstatus(MD_UN2SET(un)) & MD_SET_STALE) | |
| 1501 return; | |
| 1502 | |
| 1503 /* Add two, this includes the mirror unit and the null recid */ | |
| 1504 if (extras != NULL) { | |
| 1505 int nrecids = 0; | |
| 1506 while (extras[nrecids] != 0) { | |
| 1507 nrecids++; | |
| 1508 } | |
| 1509 ASSERT(nrecids <= MAX_EXTRAS); | |
| 1510 } | |
| 1511 | |
| 1512 if (un != NULL) | |
| 1513 recids[ri++] = un->c.un_record_id; | |
| 1514 for (i = 0; i < NMIRROR; i++) { | |
| 1515 if (!(smmask & SMI2BIT(i))) | |
| 1516 continue; | |
| 1517 sm = &un->un_sm[i]; | |
| 1518 if (!SMS_IS(sm, SMS_INUSE)) | |
| 1519 continue; | |
| 1520 if (md_getmajor(sm->sm_dev) != md_major) | |
| 1521 continue; | |
| 1522 su = MD_UNIT(md_getminor(sm->sm_dev)); | |
| 1523 recids[ri++] = su->c.un_record_id; | |
| 1524 } | |
| 1525 | |
| 1526 if (extras != NULL) | |
| 1527 while (*extras != 0) { | |
| 1528 recids[ri++] = *extras; | |
| 1529 extras++; | |
| 1530 } | |
| 1531 | |
| 1532 if (ri == 0) | |
| 1533 return; | |
| 1534 recids[ri] = 0; | |
| 1535 | |
| 1536 /* | |
| 1537 * Ok to hold ioctl lock across record commit to mddb as | |
| 1538 * long as the record(s) being committed aren't resync records. | |
| 1539 */ | |
| 1540 mddb_commitrecs_wrapper(recids); | |
| 1541 } | |
| 1542 | |
| 1543 | |
| 1544 /* | |
| 1545 * This routine is used to set a bit in the writable_bm bitmap | |
| 1546 * which represents each submirror in a metamirror which | |
| 1547 * is writable. The first writable submirror index is assigned | |
| 1548 * to the sm_index. The number of writable submirrors are returned in nunits. | |
| 1549 * | |
| 1550 * This routine returns the submirror's unit number. | |
| 1551 */ | |
| 1552 | |
| 1553 static void | |
| 1554 select_write_units(struct mm_unit *un, md_mps_t *ps) | |
| 1555 { | |
| 1556 | |
| 1557 int i; | |
| 1558 unsigned writable_bm = 0; | |
| 1559 unsigned nunits = 0; | |
| 1560 | |
| 1561 for (i = 0; i < NMIRROR; i++) { | |
| 1562 if (SUBMIRROR_IS_WRITEABLE(un, i)) { | |
| 1563 /* set bit of all writable units */ | |
| 1564 writable_bm |= SMI2BIT(i); | |
| 1565 nunits++; | |
| 1566 } | |
| 1567 } | |
| 1568 ps->ps_writable_sm = writable_bm; | |
| 1569 ps->ps_active_cnt = nunits; | |
| 1570 ps->ps_current_sm = 0; | |
| 1571 } | |
| 1572 | |
| 1573 static | |
| 1574 unsigned | |
| 1575 select_write_after_read_units(struct mm_unit *un, md_mps_t *ps) | |
| 1576 { | |
| 1577 | |
| 1578 int i; | |
| 1579 unsigned writable_bm = 0; | |
| 1580 unsigned nunits = 0; | |
| 1581 | |
| 1582 for (i = 0; i < NMIRROR; i++) { | |
| 1583 if (SUBMIRROR_IS_WRITEABLE(un, i) && | |
| 1584 un->un_sm[i].sm_flags & MD_SM_RESYNC_TARGET) { | |
| 1585 writable_bm |= SMI2BIT(i); | |
| 1586 nunits++; | |
| 1587 } | |
| 1588 } | |
| 1589 if ((writable_bm & ps->ps_allfrom_sm) != 0) { | |
| 1590 writable_bm &= ~ps->ps_allfrom_sm; | |
| 1591 nunits--; | |
| 1592 } | |
| 1593 ps->ps_writable_sm = writable_bm; | |
| 1594 ps->ps_active_cnt = nunits; | |
| 1595 ps->ps_current_sm = 0; | |
| 1596 return (nunits); | |
| 1597 } | |
| 1598 | |
| 1599 static md_dev64_t | |
| 1600 select_read_unit( | |
| 1601 mm_unit_t *un, | |
| 1602 diskaddr_t blkno, | |
| 1603 u_longlong_t reqcount, | |
| 1604 u_longlong_t *cando, | |
| 1605 int must_be_opened, | |
| 1606 md_m_shared_t **shared, | |
| 1607 md_mcs_t *cs) | |
| 1608 { | |
| 1609 int i; | |
| 1610 md_m_shared_t *s; | |
| 1611 uint_t lasterrcnt = 0; | |
| 1612 md_dev64_t dev = 0; | |
| 1613 u_longlong_t cnt; | |
| 1614 u_longlong_t mincnt; | |
| 1615 mm_submirror_t *sm; | |
| 1616 mm_submirror_ic_t *smic; | |
| 1617 mdi_unit_t *ui; | |
| 1618 | |
| 1619 mincnt = reqcount; | |
| 1620 for (i = 0; i < NMIRROR; i++) { | |
| 1621 if (!SUBMIRROR_IS_READABLE(un, i)) | |
| 1622 continue; | |
| 1623 sm = &un->un_sm[i]; | |
| 1624 smic = &un->un_smic[i]; | |
| 1625 cnt = reqcount; | |
| 1626 | |
| 1627 /* | |
| 1628 * If the current submirror is marked as inaccessible, do not | |
| 1629 * try to access it. | |
| 1630 */ | |
| 1631 ui = MDI_UNIT(getminor(expldev(sm->sm_dev))); | |
| 1632 (void) md_unit_readerlock(ui); | |
| 1633 if (ui->ui_tstate & MD_INACCESSIBLE) { | |
| 1634 md_unit_readerexit(ui); | |
| 1635 continue; | |
| 1636 } | |
| 1637 md_unit_readerexit(ui); | |
| 1638 | |
| 1639 s = (md_m_shared_t *)(*(smic->sm_shared_by_blk)) | |
| 1640 (sm->sm_dev, sm, blkno, &cnt); | |
| 1641 | |
| 1642 if (must_be_opened && !(s->ms_flags & MDM_S_ISOPEN)) | |
| 1643 continue; | |
| 1644 if (s->ms_state == CS_OKAY) { | |
| 1645 *cando = cnt; | |
| 1646 if (shared != NULL) | |
| 1647 *shared = s; | |
| 1648 | |
| 1649 if (un->un_sm[i].sm_flags & MD_SM_FAILFAST && | |
| 1650 cs != NULL) { | |
| 1651 cs->cs_buf.b_flags |= B_FAILFAST; | |
| 1652 } | |
| 1653 | |
| 1654 return (un->un_sm[i].sm_dev); | |
| 1655 } | |
| 1656 if (s->ms_state != CS_LAST_ERRED) | |
| 1657 continue; | |
| 1658 | |
| 1659 /* don't use B_FAILFAST since we're Last Erred */ | |
| 1660 | |
| 1661 if (mincnt > cnt) | |
| 1662 mincnt = cnt; | |
| 1663 if (s->ms_lasterrcnt > lasterrcnt) { | |
| 1664 lasterrcnt = s->ms_lasterrcnt; | |
| 1665 if (shared != NULL) | |
| 1666 *shared = s; | |
| 1667 dev = un->un_sm[i].sm_dev; | |
| 1668 } | |
| 1669 } | |
| 1670 *cando = mincnt; | |
| 1671 return (dev); | |
| 1672 } | |
| 1673 | |
| 1674 /* | |
| 1675 * Given a 32-bit bitmap, this routine will return the bit number | |
| 1676 * of the nth bit set. The nth bit set is passed via the index integer. | |
| 1677 * | |
| 1678 * This routine is used to run through the writable submirror bitmap | |
| 1679 * and starting all of the writes. See the value returned is the | |
| 1680 * index to appropriate submirror structure, in the md_sm | |
| 1681 * array for metamirrors. | |
| 1682 */ | |
| 1683 static int | |
| 1684 md_find_nth_unit(uint_t mask, int index) | |
| 1685 { | |
| 1686 int bit, nfound; | |
| 1687 | |
| 1688 for (bit = -1, nfound = -1; nfound != index; bit++) { | |
| 1689 ASSERT(mask != 0); | |
| 1690 nfound += (mask & 1); | |
| 1691 mask >>= 1; | |
| 1692 } | |
| 1693 return (bit); | |
| 1694 } | |
| 1695 | |
| 1696 static int | |
| 1697 fast_select_read_unit(md_mps_t *ps, md_mcs_t *cs) | |
| 1698 { | |
| 1699 mm_unit_t *un; | |
| 1700 buf_t *bp; | |
| 1701 int i; | |
| 1702 unsigned nunits = 0; | |
| 1703 int iunit; | |
| 1704 uint_t running_bm = 0; | |
| 1705 uint_t sm_index; | |
| 1706 | |
| 1707 bp = &cs->cs_buf; | |
| 1708 un = ps->ps_un; | |
| 1709 | |
| 1710 for (i = 0; i < NMIRROR; i++) { | |
| 1711 if (!SMS_BY_INDEX_IS(un, i, SMS_RUNNING)) | |
| 1712 continue; | |
| 1713 running_bm |= SMI2BIT(i); | |
| 1714 nunits++; | |
| 1715 } | |
| 1716 if (nunits == 0) | |
| 1717 return (1); | |
| 1718 | |
| 1719 /* | |
| 1720 * For directed mirror read (DMR) we only use the specified side and | |
| 1721 * do not compute the source of the read. | |
| 1722 */ | |
| 1723 if (ps->ps_flags & MD_MPS_DMR) { | |
| 1724 sm_index = un->un_dmr_last_read; | |
| 1725 } else { | |
| 1726 /* Normal (non-DMR) operation */ | |
| 1727 switch (un->un_read_option) { | |
| 1728 case RD_GEOMETRY: | |
| 1729 iunit = (int)(bp->b_lblkno / | |
| 1730 howmany(un->c.un_total_blocks, nunits)); | |
| 1731 sm_index = md_find_nth_unit(running_bm, iunit); | |
| 1732 break; | |
| 1733 case RD_FIRST: | |
| 1734 sm_index = md_find_nth_unit(running_bm, 0); | |
| 1735 break; | |
| 1736 case RD_LOAD_BAL: | |
| 1737 /* this is intentional to fall into the default */ | |
| 1738 default: | |
| 1739 un->un_last_read = (un->un_last_read + 1) % nunits; | |
| 1740 sm_index = md_find_nth_unit(running_bm, | |
| 1741 un->un_last_read); | |
| 1742 break; | |
| 1743 } | |
| 1744 } | |
| 1745 bp->b_edev = md_dev64_to_dev(un->un_sm[sm_index].sm_dev); | |
| 1746 ps->ps_allfrom_sm = SMI2BIT(sm_index); | |
| 1747 | |
| 1748 if (un->un_sm[sm_index].sm_flags & MD_SM_FAILFAST) { | |
| 1749 bp->b_flags |= B_FAILFAST; | |
| 1750 } | |
| 1751 | |
| 1752 return (0); | |
| 1753 } | |
| 1754 | |
| 1755 static | |
| 1756 int | |
| 1757 mirror_are_submirrors_available(mm_unit_t *un) | |
| 1758 { | |
| 1759 int i; | |
| 1760 for (i = 0; i < NMIRROR; i++) { | |
| 1761 md_dev64_t tmpdev = un->un_sm[i].sm_dev; | |
| 1762 | |
| 1763 if ((!SMS_BY_INDEX_IS(un, i, SMS_INUSE)) || | |
| 1764 md_getmajor(tmpdev) != md_major) | |
| 1765 continue; | |
| 1766 | |
| 1767 if ((MD_MIN2SET(md_getminor(tmpdev)) >= md_nsets) || | |
| 1768 (MD_MIN2UNIT(md_getminor(tmpdev)) >= md_nunits)) | |
| 1769 return (0); | |
| 1770 | |
| 1771 if (MDI_UNIT(md_getminor(tmpdev)) == NULL) | |
| 1772 return (0); | |
| 1773 } | |
| 1774 return (1); | |
| 1775 } | |
| 1776 | |
| 1777 void | |
| 1778 build_submirror(mm_unit_t *un, int i, int snarfing) | |
| 1779 { | |
| 1780 struct mm_submirror *sm; | |
| 1781 struct mm_submirror_ic *smic; | |
| 1782 md_unit_t *su; | |
| 1783 set_t setno; | |
| 1784 | |
| 1785 sm = &un->un_sm[i]; | |
| 1786 smic = &un->un_smic[i]; | |
| 1787 | |
| 1788 sm->sm_flags = 0; /* sometime we may need to do more here */ | |
| 1789 | |
| 1790 setno = MD_UN2SET(un); | |
| 1791 | |
| 1792 if (!SMS_IS(sm, SMS_INUSE)) | |
| 1793 return; | |
| 1794 if (snarfing) { | |
| 1795 sm->sm_dev = md_getdevnum(setno, mddb_getsidenum(setno), | |
| 1796 sm->sm_key, MD_NOTRUST_DEVT); | |
| 1797 } else { | |
| 1798 if (md_getmajor(sm->sm_dev) == md_major) { | |
| 1799 su = MD_UNIT(md_getminor(sm->sm_dev)); | |
| 1800 un->c.un_flag |= (su->c.un_flag & MD_LABELED); | |
| 1801 /* submirror can no longer be soft partitioned */ | |
| 1802 MD_CAPAB(su) &= (~MD_CAN_SP); | |
| 1803 } | |
| 1804 } | |
| 1805 smic->sm_shared_by_blk = md_get_named_service(sm->sm_dev, | |
| 1806 0, "shared by blk", 0); | |
| 1807 smic->sm_shared_by_indx = md_get_named_service(sm->sm_dev, | |
| 1808 0, "shared by indx", 0); | |
| 1809 smic->sm_get_component_count = | |
| 1810 (int (*)())md_get_named_service(sm->sm_dev, 0, | |
| 1811 "get component count", 0); | |
| 1812 smic->sm_get_bcss = | |
| 1813 (int (*)())md_get_named_service(sm->sm_dev, 0, | |
| 1814 "get block count skip size", 0); | |
| 1815 sm->sm_state &= ~SMS_IGNORE; | |
| 1816 if (SMS_IS(sm, SMS_OFFLINE)) | |
| 1817 MD_STATUS(un) |= MD_UN_OFFLINE_SM; | |
| 1818 md_set_parent(sm->sm_dev, MD_SID(un)); | |
| 1819 } | |
| 1820 | |
| 1821 static void | |
| 1822 mirror_cleanup(mm_unit_t *un) | |
| 1823 { | |
| 1824 mddb_recid_t recid; | |
| 1825 int smi; | |
| 1826 sv_dev_t sv[NMIRROR]; | |
| 1827 int nsv = 0; | |
| 1828 | |
| 1829 /* | |
| 1830 * If a MN diskset and this node is not the master, do | |
| 1831 * not delete any records on snarf of the mirror records. | |
| 1832 */ | |
| 1833 if (MD_MNSET_SETNO(MD_UN2SET(un)) && | |
| 1834 md_set[MD_UN2SET(un)].s_am_i_master == 0) { | |
| 1835 return; | |
| 1836 } | |
| 1837 | |
| 1838 for (smi = 0; smi < NMIRROR; smi++) { | |
| 1839 if (!SMS_BY_INDEX_IS(un, smi, SMS_INUSE)) | |
| 1840 continue; | |
| 1841 sv[nsv].setno = MD_UN2SET(un); | |
| 1842 sv[nsv++].key = un->un_sm[smi].sm_key; | |
| 1843 } | |
| 1844 | |
| 1845 recid = un->un_rr_dirty_recid; | |
| 1846 mddb_deleterec_wrapper(un->c.un_record_id); | |
| 1847 if (recid > 0) | |
| 1848 mddb_deleterec_wrapper(recid); | |
| 1849 | |
| 1850 md_rem_names(sv, nsv); | |
| 1851 } | |
| 1852 | |
| 1853 /* Return a -1 if optimized record unavailable and set should be released */ | |
| 1854 int | |
| 1855 mirror_build_incore(mm_unit_t *un, int snarfing) | |
| 1856 { | |
| 1857 int i; | |
| 1858 | |
| 1859 if (MD_STATUS(un) & MD_UN_BEING_RESET) { | |
| 1860 mddb_setrecprivate(un->c.un_record_id, MD_PRV_PENDCLEAN); | |
| 1861 return (1); | |
| 1862 } | |
| 1863 | |
| 1864 if (mirror_are_submirrors_available(un) == 0) | |
| 1865 return (1); | |
| 1866 | |
| 1867 if (MD_UNIT(MD_SID(un)) != NULL) | |
| 1868 return (0); | |
| 1869 | |
| 1870 MD_STATUS(un) = 0; | |
| 1871 | |
| 1872 /* pre-4.1 didn't define CAN_META_CHILD capability */ | |
| 1873 MD_CAPAB(un) = MD_CAN_META_CHILD | MD_CAN_PARENT | MD_CAN_SP; | |
| 1874 | |
| 1875 un->un_ovrlap_chn_flg = 0; | |
| 1876 bzero(&un->un_ovrlap_chn, sizeof (un->un_ovrlap_chn)); | |
| 1877 | |
| 1878 for (i = 0; i < NMIRROR; i++) | |
| 1879 build_submirror(un, i, snarfing); | |
| 1880 | |
| 1881 if (unit_setup_resync(un, snarfing) != 0) { | |
| 1882 if (snarfing) { | |
| 1883 mddb_setrecprivate(un->c.un_record_id, MD_PRV_GOTIT); | |
| 1884 /* | |
| 1885 * If a MN set and set is not stale, then return -1 | |
| 1886 * which will force the caller to unload the set. | |
| 1887 * The MN diskset nodes will return failure if | |
| 1888 * unit_setup_resync fails so that nodes won't | |
| 1889 * get out of sync. | |
| 1890 * | |
| 1891 * If set is STALE, the master node can't allocate | |
| 1892 * a resync record (if needed), but node needs to | |
| 1893 * join the set so that user can delete broken mddbs. | |
| 1894 * So, if set is STALE, just continue on. | |
| 1895 */ | |
| 1896 if (MD_MNSET_SETNO(MD_UN2SET(un)) && | |
| 1897 !(md_get_setstatus(MD_UN2SET(un)) & MD_SET_STALE)) { | |
| 1898 return (-1); | |
| 1899 } | |
| 1900 } else | |
| 1901 return (1); | |
| 1902 } | |
| 1903 | |
| 1904 mutex_init(&un->un_ovrlap_chn_mx, NULL, MUTEX_DEFAULT, NULL); | |
| 1905 cv_init(&un->un_ovrlap_chn_cv, NULL, CV_DEFAULT, NULL); | |
| 1906 | |
| 1907 un->un_suspend_wr_flag = 0; | |
| 1908 mutex_init(&un->un_suspend_wr_mx, NULL, MUTEX_DEFAULT, NULL); | |
| 1909 cv_init(&un->un_suspend_wr_cv, NULL, CV_DEFAULT, NULL); | |
| 1910 | |
| 1911 /* | |
| 1912 * Allocate mutexes for mirror-owner and resync-owner changes. | |
| 1913 * All references to the owner message state field must be guarded | |
| 1914 * by this mutex. | |
| 1915 */ | |
| 1916 mutex_init(&un->un_owner_mx, NULL, MUTEX_DEFAULT, NULL); | |
| 1917 | |
| 1918 /* | |
| 1919 * Allocate mutex and condvar for resync thread manipulation. These | |
| 1920 * will be used by mirror_resync_unit/mirror_ioctl_resync | |
| 1921 */ | |
| 1922 mutex_init(&un->un_rs_thread_mx, NULL, MUTEX_DEFAULT, NULL); | |
| 1923 cv_init(&un->un_rs_thread_cv, NULL, CV_DEFAULT, NULL); | |
| 1924 | |
| 1925 /* | |
| 1926 * Allocate mutex and condvar for resync progress thread manipulation. | |
| 1927 * This allows resyncs to be continued across an intervening reboot. | |
| 1928 */ | |
| 1929 mutex_init(&un->un_rs_progress_mx, NULL, MUTEX_DEFAULT, NULL); | |
| 1930 cv_init(&un->un_rs_progress_cv, NULL, CV_DEFAULT, NULL); | |
| 1931 | |
| 1932 /* | |
| 1933 * Allocate mutex and condvar for Directed Mirror Reads (DMR). This | |
| 1934 * provides synchronization between a user-ioctl and the resulting | |
| 1935 * strategy() call that performs the read(). | |
| 1936 */ | |
| 1937 mutex_init(&un->un_dmr_mx, NULL, MUTEX_DEFAULT, NULL); | |
| 1938 cv_init(&un->un_dmr_cv, NULL, CV_DEFAULT, NULL); | |
| 1939 | |
| 1940 MD_UNIT(MD_SID(un)) = un; | |
| 1941 return (0); | |
| 1942 } | |
| 1943 | |
| 1944 | |
| 1945 void | |
| 1946 reset_mirror(struct mm_unit *un, minor_t mnum, int removing) | |
| 1947 { | |
| 1948 mddb_recid_t recid, vtoc_id; | |
| 1949 size_t bitcnt; | |
| 1950 size_t shortcnt; | |
| 1951 int smi; | |
| 1952 sv_dev_t sv[NMIRROR]; | |
| 1953 int nsv = 0; | |
| 1954 uint_t bits = 0; | |
| 1955 minor_t selfid; | |
| 1956 md_unit_t *su; | |
| 1957 | |
| 1958 md_destroy_unit_incore(mnum, &mirror_md_ops); | |
| 1959 | |
| 1960 shortcnt = un->un_rrd_num * sizeof (short); | |
| 1961 bitcnt = howmany(un->un_rrd_num, NBBY); | |
| 1962 | |
| 1963 if (un->un_outstanding_writes) | |
| 1964 kmem_free((caddr_t)un->un_outstanding_writes, shortcnt); | |
| 1965 if (un->un_goingclean_bm) | |
| 1966 kmem_free((caddr_t)un->un_goingclean_bm, bitcnt); | |
| 1967 if (un->un_goingdirty_bm) | |
| 1968 kmem_free((caddr_t)un->un_goingdirty_bm, bitcnt); | |
| 1969 if (un->un_resync_bm) | |
| 1970 kmem_free((caddr_t)un->un_resync_bm, bitcnt); | |
| 1971 | |
| 1972 MD_UNIT(mnum) = NULL; | |
| 1973 | |
| 1974 if (!removing) | |
| 1975 return; | |
| 1976 | |
| 1977 for (smi = 0; smi < NMIRROR; smi++) { | |
| 1978 if (!SMS_BY_INDEX_IS(un, smi, SMS_INUSE)) | |
| 1979 continue; | |
| 1980 /* reallow soft partitioning of submirror and reset parent */ | |
| 1981 su = MD_UNIT(md_getminor(un->un_sm[smi].sm_dev)); | |
| 1982 MD_CAPAB(su) |= MD_CAN_SP; | |
| 1983 md_reset_parent(un->un_sm[smi].sm_dev); | |
| 1984 reset_comp_states(&un->un_sm[smi], &un->un_smic[smi]); | |
| 1985 | |
| 1986 sv[nsv].setno = MD_MIN2SET(mnum); | |
| 1987 sv[nsv++].key = un->un_sm[smi].sm_key; | |
| 1988 bits |= SMI2BIT(smi); | |
| 1989 } | |
| 1990 | |
| 1991 MD_STATUS(un) |= MD_UN_BEING_RESET; | |
| 1992 recid = un->un_rr_dirty_recid; | |
| 1993 vtoc_id = un->c.un_vtoc_id; | |
| 1994 selfid = MD_SID(un); | |
| 1995 | |
| 1996 mirror_commit(un, bits, 0); | |
| 1997 | |
| 1998 /* Destroy all mutexes and condvars before returning. */ | |
| 1999 mutex_destroy(&un->un_suspend_wr_mx); | |
| 2000 cv_destroy(&un->un_suspend_wr_cv); | |
| 2001 mutex_destroy(&un->un_ovrlap_chn_mx); | |
| 2002 cv_destroy(&un->un_ovrlap_chn_cv); | |
| 2003 mutex_destroy(&un->un_owner_mx); | |
| 2004 mutex_destroy(&un->un_rs_thread_mx); | |
| 2005 cv_destroy(&un->un_rs_thread_cv); | |
| 2006 mutex_destroy(&un->un_rs_progress_mx); | |
| 2007 cv_destroy(&un->un_rs_progress_cv); | |
| 2008 mutex_destroy(&un->un_dmr_mx); | |
| 2009 cv_destroy(&un->un_dmr_cv); | |
| 2010 mddb_deleterec_wrapper(un->c.un_record_id); | |
| 2011 if (recid != 0) | |
| 2012 mddb_deleterec_wrapper(recid); | |
| 2013 | |
| 2014 /* Remove the vtoc, if present */ | |
| 2015 if (vtoc_id) | |
| 2016 mddb_deleterec_wrapper(vtoc_id); | |
| 2017 | |
| 2018 md_rem_names(sv, nsv); | |
| 2019 | |
| 2020 SE_NOTIFY(EC_SVM_CONFIG, ESC_SVM_DELETE, SVM_TAG_METADEVICE, | |
| 2021 MD_MIN2SET(selfid), selfid); | |
| 2022 } | |
| 2023 | |
| 2024 int | |
| 2025 mirror_internal_open( | |
| 2026 minor_t mnum, | |
| 2027 int flag, | |
| 2028 int otyp, | |
| 2029 int md_oflags, | |
| 2030 IOLOCK *lockp /* can be NULL */ | |
| 2031 ) | |
| 2032 { | |
| 2033 mdi_unit_t *ui = MDI_UNIT(mnum); | |
| 2034 int err = 0; | |
| 2035 | |
| 2036 tryagain: | |
| 2037 /* single thread */ | |
| 2038 if (lockp) { | |
| 2039 /* | |
| 2040 * If ioctl lock is held, use openclose_enter | |
| 2041 * routine that will set the ioctl flag when | |
| 2042 * grabbing the readerlock. | |
| 2043 */ | |
| 2044 (void) md_ioctl_openclose_enter(lockp, ui); | |
| 2045 } else { | |
| 2046 (void) md_unit_openclose_enter(ui); | |
| 2047 } | |
| 2048 | |
| 2049 /* | |
| 2050 * The mirror_open_all_devs routine may end up sending a STATE_UPDATE | |
| 2051 * message in a MN diskset and this requires that the openclose | |
| 2052 * lock is dropped in order to send this message. So, another | |
| 2053 * flag (MD_UL_OPENINPROGRESS) is used to keep another thread from | |
| 2054 * attempting an open while this thread has an open in progress. | |
| 2055 * Call the *_lh version of the lock exit routines since the ui_mx | |
| 2056 * mutex must be held from checking for OPENINPROGRESS until | |
| 2057 * after the cv_wait call. | |
| 2058 */ | |
| 2059 mutex_enter(&ui->ui_mx); | |
| 2060 if (ui->ui_lock & MD_UL_OPENINPROGRESS) { | |
| 2061 if (lockp) { | |
| 2062 (void) md_ioctl_openclose_exit_lh(lockp); | |
| 2063 } else { | |
| 2064 md_unit_openclose_exit_lh(ui); | |
| 2065 } | |
| 2066 cv_wait(&ui->ui_cv, &ui->ui_mx); | |
| 2067 mutex_exit(&ui->ui_mx); | |
| 2068 goto tryagain; | |
| 2069 } | |
| 2070 | |
| 2071 ui->ui_lock |= MD_UL_OPENINPROGRESS; | |
| 2072 mutex_exit(&ui->ui_mx); | |
| 2073 | |
| 2074 /* open devices, if necessary */ | |
| 2075 if (! md_unit_isopen(ui) || (ui->ui_tstate & MD_INACCESSIBLE)) { | |
| 2076 if ((err = mirror_open_all_devs(mnum, md_oflags, lockp)) != 0) | |
| 2077 goto out; | |
| 2078 } | |
| 2079 | |
| 2080 /* count open */ | |
| 2081 if ((err = md_unit_incopen(mnum, flag, otyp)) != 0) | |
| 2082 goto out; | |
| 2083 | |
| 2084 /* unlock, return success */ | |
| 2085 out: | |
| 2086 mutex_enter(&ui->ui_mx); | |
| 2087 ui->ui_lock &= ~MD_UL_OPENINPROGRESS; | |
| 2088 mutex_exit(&ui->ui_mx); | |
| 2089 | |
| 2090 if (lockp) { | |
| 2091 /* | |
| 2092 * If ioctl lock is held, use openclose_exit | |
| 2093 * routine that will clear the lockp reader flag. | |
| 2094 */ | |
| 2095 (void) md_ioctl_openclose_exit(lockp); | |
| 2096 } else { | |
| 2097 md_unit_openclose_exit(ui); | |
| 2098 } | |
| 2099 return (err); | |
| 2100 } | |
| 2101 | |
| 2102 int | |
| 2103 mirror_internal_close( | |
| 2104 minor_t mnum, | |
| 2105 int otyp, | |
| 2106 int md_cflags, | |
| 2107 IOLOCK *lockp /* can be NULL */ | |
| 2108 ) | |
| 2109 { | |
| 2110 mdi_unit_t *ui = MDI_UNIT(mnum); | |
| 2111 mm_unit_t *un; | |
| 2112 int err = 0; | |
| 2113 | |
| 2114 /* single thread */ | |
| 2115 if (lockp) { | |
| 2116 /* | |
| 2117 * If ioctl lock is held, use openclose_enter | |
| 2118 * routine that will set the ioctl flag when | |
| 2119 * grabbing the readerlock. | |
| 2120 */ | |
| 2121 un = (mm_unit_t *)md_ioctl_openclose_enter(lockp, ui); | |
| 2122 } else { | |
| 2123 un = (mm_unit_t *)md_unit_openclose_enter(ui); | |
| 2124 } | |
| 2125 | |
| 2126 /* count closed */ | |
| 2127 if ((err = md_unit_decopen(mnum, otyp)) != 0) | |
| 2128 goto out; | |
| 2129 | |
| 2130 /* close devices, if necessary */ | |
| 2131 if (! md_unit_isopen(ui) || (md_cflags & MD_OFLG_PROBEDEV)) { | |
| 2132 /* | |
| 2133 * Clean up dirty bitmap for this unit. Do this | |
| 2134 * before closing the underlying devices to avoid | |
| 2135 * race conditions with reset_mirror() as a | |
| 2136 * result of a 'metaset -r' command running in | |
| 2137 * parallel. This might cause deallocation of | |
| 2138 * dirty region bitmaps; with underlying metadevices | |
| 2139 * in place this can't happen. | |
| 2140 * Don't do this if a MN set and ABR not set | |
| 2141 */ | |
| 2142 if (new_resync && !(MD_STATUS(un) & MD_UN_KEEP_DIRTY)) { | |
| 2143 if (!MD_MNSET_SETNO(MD_UN2SET(un)) || | |
| 2144 !(ui->ui_tstate & MD_ABR_CAP)) | |
| 2145 mirror_process_unit_resync(un); | |
| 2146 } | |
| 2147 (void) mirror_close_all_devs(un, md_cflags); | |
| 2148 | |
| 2149 /* | |
| 2150 * For a MN set with transient capabilities (eg ABR/DMR) set, | |
| 2151 * clear these capabilities on the last open in the cluster. | |
| 2152 * To do this we send a message to all nodes to see of the | |
| 2153 * device is open. | |
| 2154 */ | |
| 2155 if (MD_MNSET_SETNO(MD_UN2SET(un)) && | |
| 2156 (ui->ui_tstate & (MD_ABR_CAP|MD_DMR_CAP))) { | |
| 2157 if (lockp) { | |
| 2158 (void) md_ioctl_openclose_exit(lockp); | |
| 2159 } else { | |
| 2160 md_unit_openclose_exit(ui); | |
| 2161 } | |
| 2162 | |
| 2163 /* | |
| 2164 * if we are in the context of an ioctl, drop the | |
| 2165 * ioctl lock. | |
| 2166 * Otherwise, no other locks should be held. | |
| 2167 */ | |
| 2168 if (lockp) { | |
| 2169 IOLOCK_RETURN_RELEASE(0, lockp); | |
| 2170 } | |
| 2171 | |
| 2172 mdmn_clear_all_capabilities(mnum); | |
| 2173 | |
| 2174 /* if dropped the lock previously, regain it */ | |
| 2175 if (lockp) { | |
| 2176 IOLOCK_RETURN_REACQUIRE(lockp); | |
| 2177 } | |
| 2178 return (0); | |
| 2179 } | |
| 2180 /* unlock and return success */ | |
| 2181 } | |
| 2182 out: | |
| 2183 /* Call whether lockp is NULL or not. */ | |
| 2184 if (lockp) { | |
| 2185 md_ioctl_openclose_exit(lockp); | |
| 2186 } else { | |
| 2187 md_unit_openclose_exit(ui); | |
| 2188 } | |
| 2189 return (err); | |
| 2190 } | |
| 2191 | |
| 2192 /* | |
| 2193 * When a component has completed resyncing and is now ok, check if the | |
| 2194 * corresponding component in the other submirrors is in the Last Erred | |
| 2195 * state. If it is, we want to change that to the Erred state so we stop | |
| 2196 * using that component and start using this good component instead. | |
| 2197 * | |
| 2198 * This is called from set_sm_comp_state and recursively calls | |
| 2199 * set_sm_comp_state if it needs to change the Last Erred state. | |
| 2200 */ | |
| 2201 static void | |
| 2202 reset_lasterred(mm_unit_t *un, int smi, mddb_recid_t *extras, uint_t flags, | |
| 2203 IOLOCK *lockp) | |
| 2204 { | |
| 2205 mm_submirror_t *sm; | |
| 2206 mm_submirror_ic_t *smic; | |
| 2207 int ci; | |
| 2208 int i; | |
| 2209 int compcnt; | |
| 2210 int changed = 0; | |
| 2211 | |
| 2212 for (i = 0; i < NMIRROR; i++) { | |
| 2213 sm = &un->un_sm[i]; | |
| 2214 smic = &un->un_smic[i]; | |
| 2215 | |
| 2216 if (!SMS_IS(sm, SMS_INUSE)) | |
| 2217 continue; | |
| 2218 | |
| 2219 /* ignore the submirror that we just made ok */ | |
| 2220 if (i == smi) | |
| 2221 continue; | |
| 2222 | |
| 2223 compcnt = (*(smic->sm_get_component_count)) (sm->sm_dev, un); | |
| 2224 for (ci = 0; ci < compcnt; ci++) { | |
| 2225 md_m_shared_t *shared; | |
| 2226 | |
| 2227 shared = (md_m_shared_t *)(*(smic->sm_shared_by_indx)) | |
| 2228 (sm->sm_dev, sm, ci); | |
| 2229 | |
| 2230 if ((shared->ms_state & CS_LAST_ERRED) && | |
| 2231 !mirror_other_sources(un, i, ci, 1)) { | |
| 2232 | |
| 2233 set_sm_comp_state(un, i, ci, CS_ERRED, extras, | |
| 2234 flags, lockp); | |
| 2235 changed = 1; | |
| 2236 } | |
| 2237 } | |
| 2238 } | |
| 2239 | |
| 2240 /* maybe there is a hotspare for this newly erred component */ | |
| 2241 if (changed) { | |
| 2242 set_t setno; | |
| 2243 | |
| 2244 setno = MD_UN2SET(un); | |
| 2245 if (MD_MNSET_SETNO(setno)) { | |
| 2246 send_poke_hotspares(setno); | |
| 2247 } else { | |
| 2248 (void) poke_hotspares(); | |
| 2249 } | |
| 2250 } | |
| 2251 } | |
| 2252 | |
| 2253 /* | |
| 2254 * set_sm_comp_state | |
| 2255 * | |
| 2256 * Set the state of a submirror component to the specified new state. | |
| 2257 * If the mirror is in a multi-node set, send messages to all nodes to | |
| 2258 * block all writes to the mirror and then update the state and release the | |
| 2259 * writes. These messages are only sent if MD_STATE_XMIT is set in flags. | |
| 2260 * MD_STATE_XMIT will be unset in 2 cases: | |
| 2261 * 1. When the state is changed to CS_RESYNC as this state change | |
| 2262 * will already have been updated on each node by the processing of the | |
| 2263 * distributed metasync command, hence no need to xmit. | |
| 2264 * 2. When the state is change to CS_OKAY after a resync has completed. Again | |
| 2265 * the resync completion will already have been processed on each node by | |
| 2266 * the processing of the MD_MN_MSG_RESYNC_PHASE_DONE message for a component | |
| 2267 * resync, hence no need to xmit. | |
| 2268 * | |
| 2269 * In case we are called from the updates of a watermark, | |
| 2270 * (then MD_STATE_WMUPDATE will be set in the ps->flags) this is due to | |
| 2271 * a metainit or similar. In this case the message that we sent to propagate | |
| 2272 * the state change must not be a class1 message as that would deadlock with | |
| 2273 * the metainit command that is still being processed. | |
| 2274 * This we achieve by creating a class2 message MD_MN_MSG_STATE_UPDATE2 | |
| 2275 * instead. This also makes the submessage generator to create a class2 | |
| 2276 * submessage rather than a class1 (which would also block) | |
| 2277 * | |
| 2278 * On entry, unit_writerlock is held | |
| 2279 * If MD_STATE_OCHELD is set in flags, then unit_openclose lock is | |
| 2280 * also held. | |
| 2281 */ | |
| 2282 void | |
| 2283 set_sm_comp_state( | |
| 2284 mm_unit_t *un, | |
| 2285 int smi, | |
| 2286 int ci, | |
| 2287 int newstate, | |
| 2288 mddb_recid_t *extras, | |
| 2289 uint_t flags, | |
| 2290 IOLOCK *lockp | |
| 2291 ) | |
| 2292 { | |
| 2293 mm_submirror_t *sm; | |
| 2294 mm_submirror_ic_t *smic; | |
| 2295 md_m_shared_t *shared; | |
| 2296 int origstate; | |
| 2297 void (*get_dev)(); | |
| 2298 ms_cd_info_t cd; | |
| 2299 char devname[MD_MAX_CTDLEN]; | |
| 2300 int err; | |
| 2301 set_t setno = MD_UN2SET(un); | |
| 2302 md_mn_msg_stch_t stchmsg; | |
| 2303 mdi_unit_t *ui = MDI_UNIT(MD_SID(un)); | |
| 2304 md_mn_kresult_t *kresult; | |
| 2305 int rval; | |
| 2306 uint_t msgflags; | |
| 2307 md_mn_msgtype_t msgtype; | |
| 2308 int save_lock = 0; | |
| 2309 mdi_unit_t *ui_sm; | |
| 2310 | |
| 2311 sm = &un->un_sm[smi]; | |
| 2312 smic = &un->un_smic[smi]; | |
| 2313 | |
| 2314 /* If we have a real error status then turn off MD_INACCESSIBLE. */ | |
| 2315 ui_sm = MDI_UNIT(getminor(md_dev64_to_dev(sm->sm_dev))); | |
| 2316 if (newstate & (CS_ERRED | CS_RESYNC | CS_LAST_ERRED) && | |
| 2317 ui_sm->ui_tstate & MD_INACCESSIBLE) { | |
| 2318 ui_sm->ui_tstate &= ~MD_INACCESSIBLE; | |
| 2319 } | |
| 2320 | |
| 2321 shared = (md_m_shared_t *) | |
| 2322 (*(smic->sm_shared_by_indx))(sm->sm_dev, sm, ci); | |
| 2323 origstate = shared->ms_state; | |
| 2324 | |
| 2325 /* | |
| 2326 * If the new state is an error and the old one wasn't, generate | |
| 2327 * a console message. We do this before we send the state to other | |
| 2328 * nodes in a MN set because the state change may change the component | |
| 2329 * name if a hotspare is allocated. | |
| 2330 */ | |
| 2331 if ((! (origstate & (CS_ERRED|CS_LAST_ERRED))) && | |
| 2332 (newstate & (CS_ERRED|CS_LAST_ERRED))) { | |
| 2333 | |
| 2334 get_dev = | |
| 2335 (void (*)())md_get_named_service(sm->sm_dev, 0, | |
| 2336 "get device", 0); | |
| 2337 (void) (*get_dev)(sm->sm_dev, sm, ci, &cd); | |
| 2338 | |
| 2339 err = md_getdevname(setno, mddb_getsidenum(setno), 0, | |
| 2340 cd.cd_dev, devname, sizeof (devname)); | |
| 2341 | |
| 2342 if (err == ENOENT) { | |
| 2343 (void) md_devname(setno, cd.cd_dev, devname, | |
| 2344 sizeof (devname)); | |
| 2345 } | |
| 2346 | |
| 2347 cmn_err(CE_WARN, "md: %s: %s needs maintenance", | |
| 2348 md_shortname(md_getminor(sm->sm_dev)), devname); | |
| 2349 | |
| 2350 if (newstate & CS_LAST_ERRED) { | |
| 2351 cmn_err(CE_WARN, "md: %s: %s last erred", | |
| 2352 md_shortname(md_getminor(sm->sm_dev)), | |
| 2353 devname); | |
| 2354 | |
| 2355 } else if (shared->ms_flags & MDM_S_ISOPEN) { | |
| 2356 /* | |
| 2357 * Close the broken device and clear the open flag on | |
| 2358 * it. Closing the device means the RCM framework will | |
| 2359 * be able to unconfigure the device if required. | |
| 2360 * | |
| 2361 * We have to check that the device is open, otherwise | |
| 2362 * the first open on it has resulted in the error that | |
| 2363 * is being processed and the actual cd.cd_dev will be | |
| 2364 * NODEV64. | |
| 2365 * | |
| 2366 * If this is a multi-node mirror, then the multinode | |
| 2367 * state checks following this code will cause the | |
| 2368 * slave nodes to close the mirror in the function | |
| 2369 * mirror_set_state(). | |
| 2370 */ | |
| 2371 md_layered_close(cd.cd_dev, MD_OFLG_NULL); | |
| 2372 shared->ms_flags &= ~MDM_S_ISOPEN; | |
| 2373 } | |
| 2374 | |
| 2375 } else if ((origstate & CS_LAST_ERRED) && (newstate & CS_ERRED) && | |
| 2376 (shared->ms_flags & MDM_S_ISOPEN)) { | |
| 2377 /* | |
| 2378 * Similar to logic above except no log messages since we | |
| 2379 * are just transitioning from Last Erred to Erred. | |
| 2380 */ | |
| 2381 get_dev = (void (*)())md_get_named_service(sm->sm_dev, 0, | |
| 2382 "get device", 0); | |
| 2383 (void) (*get_dev)(sm->sm_dev, sm, ci, &cd); | |
| 2384 | |
| 2385 md_layered_close(cd.cd_dev, MD_OFLG_NULL); | |
| 2386 shared->ms_flags &= ~MDM_S_ISOPEN; | |
| 2387 } | |
| 2388 | |
| 2389 if ((MD_MNSET_SETNO(setno)) && (origstate != newstate) && | |
| 2390 (flags & MD_STATE_XMIT) && !(ui->ui_tstate & MD_ERR_PENDING)) { | |
| 2391 /* | |
| 2392 * For a multi-node mirror, send the state change to the | |
| 2393 * master, which broadcasts to all nodes, including this | |
| 2394 * one. Once the message is received, the state is set | |
| 2395 * in-core and the master commits the change to disk. | |
| 2396 * There is a case, comp_replace, where this function | |
| 2397 * can be called from within an ioctl and therefore in this | |
| 2398 * case, as the ioctl will already be called on each node, | |
| 2399 * there is no need to xmit the state change to the master for | |
| 2400 * distribution to the other nodes. MD_STATE_XMIT flag is used | |
| 2401 * to indicate whether a xmit is required. The mirror's | |
| 2402 * transient state is set to MD_ERR_PENDING to avoid sending | |
| 2403 * multiple messages. | |
| 2404 */ | |
| 2405 if (newstate & (CS_ERRED|CS_LAST_ERRED)) | |
| 2406 ui->ui_tstate |= MD_ERR_PENDING; | |
| 2407 | |
| 2408 /* | |
| 2409 * Send a state update message to all nodes. This message | |
| 2410 * will generate 2 submessages, the first one to suspend | |
| 2411 * all writes to the mirror and the second to update the | |
| 2412 * state and resume writes. | |
| 2413 */ | |
| 2414 stchmsg.msg_stch_mnum = un->c.un_self_id; | |
| 2415 stchmsg.msg_stch_sm = smi; | |
| 2416 stchmsg.msg_stch_comp = ci; | |
| 2417 stchmsg.msg_stch_new_state = newstate; | |
| 2418 stchmsg.msg_stch_hs_id = shared->ms_hs_id; | |
| 2419 #ifdef DEBUG | |
| 2420 if (mirror_debug_flag) | |
| 2421 printf("send set state, %x, %x, %x, %x, %x\n", | |
| 2422 stchmsg.msg_stch_mnum, stchmsg.msg_stch_sm, | |
| 2423 stchmsg.msg_stch_comp, stchmsg.msg_stch_new_state, | |
| 2424 stchmsg.msg_stch_hs_id); | |
| 2425 #endif | |
| 2426 if (flags & MD_STATE_WMUPDATE) { | |
| 2427 msgtype = MD_MN_MSG_STATE_UPDATE2; | |
| 2428 /* | |
| 2429 * When coming from an update of watermarks, there | |
| 2430 * must already be a message logged that triggered | |
| 2431 * this action. So, no need to log this message, too. | |
| 2432 */ | |
| 2433 msgflags = MD_MSGF_NO_LOG; | |
| 2434 } else { | |
| 2435 msgtype = MD_MN_MSG_STATE_UPDATE; | |
| 2436 msgflags = MD_MSGF_DEFAULT_FLAGS; | |
| 2437 } | |
| 2438 | |
| 2439 /* | |
| 2440 * If we are in the context of an ioctl, drop the ioctl lock. | |
| 2441 * lockp holds the list of locks held. | |
| 2442 * | |
| 2443 * Otherwise, increment the appropriate reacquire counters. | |
| 2444 * If openclose lock is *held, then must reacquire reader | |
| 2445 * lock before releasing the openclose lock. | |
| 2446 * Do not drop the ARRAY_WRITER lock as we may not be able | |
| 2447 * to reacquire it. | |
| 2448 */ | |
| 2449 if (lockp) { | |
| 2450 if (lockp->l_flags & MD_ARRAY_WRITER) { | |
| 2451 save_lock = MD_ARRAY_WRITER; | |
| 2452 lockp->l_flags &= ~MD_ARRAY_WRITER; | |
| 2453 } else if (lockp->l_flags & MD_ARRAY_READER) { | |
| 2454 save_lock = MD_ARRAY_READER; | |
| 2455 lockp->l_flags &= ~MD_ARRAY_READER; | |
| 2456 } | |
| 2457 IOLOCK_RETURN_RELEASE(0, lockp); | |
| 2458 } else { | |
| 2459 if (flags & MD_STATE_OCHELD) { | |
| 2460 md_unit_writerexit(ui); | |
| 2461 (void) md_unit_readerlock(ui); | |
| 2462 md_unit_openclose_exit(ui); | |
| 2463 } else { | |
| 2464 md_unit_writerexit(ui); | |
| 2465 } | |
| 2466 } | |
| 2467 | |
| 2468 kresult = kmem_alloc(sizeof (md_mn_kresult_t), KM_SLEEP); | |
| 2469 rval = mdmn_ksend_message(setno, | |
| 2470 msgtype, | |
| 2471 msgflags, | |
| 2472 (char *)&stchmsg, | |
| 2473 sizeof (stchmsg), | |
| 2474 kresult); | |
| 2475 | |
| 2476 if (!MDMN_KSEND_MSG_OK(rval, kresult)) { | |
| 2477 mdmn_ksend_show_error(rval, kresult, "STATE UPDATE"); | |
| 2478 cmn_err(CE_PANIC, | |
| 2479 "ksend_message failure: STATE_UPDATE"); | |
| 2480 } | |
| 2481 kmem_free(kresult, sizeof (md_mn_kresult_t)); | |
| 2482 | |
| 2483 /* if dropped the lock previously, regain it */ | |
| 2484 if (lockp) { | |
| 2485 IOLOCK_RETURN_REACQUIRE(lockp); | |
| 2486 lockp->l_flags |= save_lock; | |
| 2487 } else { | |
| 2488 /* | |
| 2489 * Reacquire dropped locks and update acquirecnts | |
| 2490 * appropriately. | |
| 2491 */ | |
| 2492 if (flags & MD_STATE_OCHELD) { | |
| 2493 /* | |
| 2494 * openclose also grabs readerlock. | |
| 2495 */ | |
| 2496 (void) md_unit_openclose_enter(ui); | |
| 2497 md_unit_readerexit(ui); | |
| 2498 (void) md_unit_writerlock(ui); | |
| 2499 } else { | |
| 2500 (void) md_unit_writerlock(ui); | |
| 2501 } | |
| 2502 } | |
| 2503 | |
| 2504 ui->ui_tstate &= ~MD_ERR_PENDING; | |
| 2505 } else { | |
| 2506 shared->ms_state = newstate; | |
| 2507 uniqtime32(&shared->ms_timestamp); | |
| 2508 | |
| 2509 if (newstate == CS_ERRED) | |
| 2510 shared->ms_flags |= MDM_S_NOWRITE; | |
| 2511 else | |
| 2512 shared->ms_flags &= ~MDM_S_NOWRITE; | |
| 2513 | |
| 2514 shared->ms_flags &= ~MDM_S_IOERR; | |
| 2515 un->un_changecnt++; | |
| 2516 shared->ms_lasterrcnt = un->un_changecnt; | |
| 2517 | |
| 2518 mirror_set_sm_state(sm, smic, SMS_RUNNING, 0); | |
| 2519 mirror_commit(un, SMI2BIT(smi), extras); | |
| 2520 } | |
| 2521 | |
| 2522 if ((origstate & CS_RESYNC) && (newstate & CS_OKAY)) { | |
| 2523 /* | |
| 2524 * Resetting the Last Erred state will recursively call back | |
| 2525 * into this function (set_sm_comp_state) to update the state. | |
| 2526 */ | |
| 2527 reset_lasterred(un, smi, extras, flags, lockp); | |
| 2528 } | |
| 2529 } | |
| 2530 | |
| 2531 static int | |
| 2532 find_another_logical( | |
| 2533 mm_unit_t *un, | |
| 2534 mm_submirror_t *esm, | |
| 2535 diskaddr_t blk, | |
| 2536 u_longlong_t cnt, | |
| 2537 int must_be_open, | |
| 2538 int state, | |
| 2539 int err_cnt) | |
| 2540 { | |
| 2541 u_longlong_t cando; | |
| 2542 md_dev64_t dev; | |
| 2543 md_m_shared_t *s; | |
| 2544 | |
| 2545 esm->sm_state |= SMS_IGNORE; | |
| 2546 while (cnt != 0) { | |
| 2547 u_longlong_t mcnt; | |
| 2548 | |
| 2549 mcnt = MIN(cnt, lbtodb(1024 * 1024 * 1024)); /* 1 Gig Blks */ | |
| 2550 | |
| 2551 dev = select_read_unit(un, blk, mcnt, &cando, must_be_open, &s, | |
| 2552 NULL); | |
| 2553 if (dev == (md_dev64_t)0) | |
| 2554 break; | |
| 2555 | |
| 2556 if ((state == CS_LAST_ERRED) && | |
| 2557 (s->ms_state == CS_LAST_ERRED) && | |
| 2558 (err_cnt > s->ms_lasterrcnt)) | |
| 2559 break; | |
| 2560 | |
| 2561 cnt -= cando; | |
| 2562 blk += cando; | |
| 2563 } | |
| 2564 esm->sm_state &= ~SMS_IGNORE; | |
| 2565 return (cnt != 0); | |
| 2566 } | |
| 2567 | |
| 2568 int | |
| 2569 mirror_other_sources(mm_unit_t *un, int smi, int ci, int must_be_open) | |
| 2570 { | |
| 2571 mm_submirror_t *sm; | |
| 2572 mm_submirror_ic_t *smic; | |
| 2573 size_t count; | |
| 2574 diskaddr_t block; | |
| 2575 u_longlong_t skip; | |
| 2576 u_longlong_t size; | |
| 2577 md_dev64_t dev; | |
| 2578 int cnt; | |
| 2579 md_m_shared_t *s; | |
| 2580 int not_found; | |
| 2581 | |
| 2582 sm = &un->un_sm[smi]; | |
| 2583 smic = &un->un_smic[smi]; | |
| 2584 dev = sm->sm_dev; | |
| 2585 | |
| 2586 /* | |
| 2587 * Make sure every component of the submirror | |
| 2588 * has other sources. | |
| 2589 */ | |
| 2590 if (ci < 0) { | |
| 2591 /* Find the highest lasterrcnt */ | |
| 2592 cnt = (*(smic->sm_get_component_count))(dev, sm); | |
| 2593 for (ci = 0; ci < cnt; ci++) { | |
| 2594 not_found = mirror_other_sources(un, smi, ci, | |
| 2595 must_be_open); | |
| 2596 if (not_found) | |
| 2597 return (1); | |
| 2598 } | |
| 2599 return (0); | |
| 2600 } | |
| 2601 | |
| 2602 /* | |
| 2603 * Make sure this component has other sources | |
| 2604 */ | |
| 2605 (void) (*(smic->sm_get_bcss)) | |
| 2606 (dev, sm, ci, &block, &count, &skip, &size); | |
| 2607 | |
| 2608 if (count == 0) | |
| 2609 return (1); | |
| 2610 | |
| 2611 s = (md_m_shared_t *)(*(smic->sm_shared_by_indx))(dev, sm, ci); | |
| 2612 | |
| 2613 while (count--) { | |
| 2614 if (block >= un->c.un_total_blocks) | |
| 2615 return (0); | |
| 2616 | |
| 2617 if ((block + size) > un->c.un_total_blocks) | |
| 2618 size = un->c.un_total_blocks - block; | |
| 2619 | |
| 2620 not_found = find_another_logical(un, sm, block, size, | |
| 2621 must_be_open, s->ms_state, s->ms_lasterrcnt); | |
| 2622 if (not_found) | |
| 2623 return (1); | |
| 2624 | |
| 2625 block += size + skip; | |
| 2626 } | |
| 2627 return (0); | |
| 2628 } | |
| 2629 | |
| 2630 static void | |
| 2631 finish_error(md_mps_t *ps) | |
| 2632 { | |
| 2633 struct buf *pb; | |
| 2634 mm_unit_t *un; | |
| 2635 mdi_unit_t *ui; | |
| 2636 uint_t new_str_flags; | |
| 2637 | |
| 2638 pb = ps->ps_bp; | |
| 2639 un = ps->ps_un; | |
| 2640 ui = ps->ps_ui; | |
| 2641 | |
| 2642 /* | |
| 2643 * Must flag any error to the resync originator if we're performing | |
| 2644 * a Write-after-Read. This corresponds to an i/o error on a resync | |
| 2645 * target device and in this case we ought to abort the resync as there | |
| 2646 * is nothing that can be done to recover from this without operator | |
| 2647 * intervention. If we don't set the B_ERROR flag we will continue | |
| 2648 * reading from the mirror but won't write to the target (as it will | |
| 2649 * have been placed into an errored state). | |
| 2650 * To handle the case of multiple components within a submirror we only | |
| 2651 * set the B_ERROR bit if explicitly requested to via MD_MPS_FLAG_ERROR. | |
| 2652 * The originator of the resync read will cause this bit to be set if | |
| 2653 * the underlying component count is one for a submirror resync. All | |
| 2654 * other resync types will have the flag set as there is no underlying | |
| 2655 * resync which can be performed on a contained metadevice for these | |
| 2656 * resync types (optimized or component). | |
| 2657 */ | |
| 2658 | |
| 2659 if (ps->ps_flags & MD_MPS_WRITE_AFTER_READ) { | |
| 2660 if (ps->ps_flags & MD_MPS_FLAG_ERROR) | |
| 2661 pb->b_flags |= B_ERROR; | |
| 2662 md_kstat_done(ui, pb, (ps->ps_flags & MD_MPS_WRITE_AFTER_READ)); | |
| 2663 MPS_FREE(mirror_parent_cache, ps); | |
| 2664 md_unit_readerexit(ui); | |
| 2665 md_biodone(pb); | |
| 2666 return; | |
| 2667 } | |
| 2668 /* | |
| 2669 * Set the MD_IO_COUNTED flag as we are retrying the same I/O | |
| 2670 * operation therefore this I/O request has already been counted, | |
| 2671 * the I/O count variable will be decremented by mirror_done()'s | |
| 2672 * call to md_biodone(). | |
| 2673 */ | |
| 2674 if (ps->ps_changecnt != un->un_changecnt) { | |
| 2675 new_str_flags = MD_STR_NOTTOP | MD_IO_COUNTED; | |
| 2676 if (ps->ps_flags & MD_MPS_WOW) | |
| 2677 new_str_flags |= MD_STR_WOW; | |
| 2678 if (ps->ps_flags & MD_MPS_MAPPED) | |
| 2679 new_str_flags |= MD_STR_MAPPED; | |
| 2680 /* | |
| 2681 * If this I/O request was a read that was part of a resync, | |
| 2682 * set MD_STR_WAR for the retried read to ensure that the | |
| 2683 * resync write (i.e. write-after-read) will be performed | |
| 2684 */ | |
| 2685 if (ps->ps_flags & MD_MPS_RESYNC_READ) | |
| 2686 new_str_flags |= MD_STR_WAR; | |
| 2687 md_kstat_done(ui, pb, (ps->ps_flags & MD_MPS_WRITE_AFTER_READ)); | |
| 2688 MPS_FREE(mirror_parent_cache, ps); | |
| 2689 md_unit_readerexit(ui); | |
| 2690 (void) md_mirror_strategy(pb, new_str_flags, NULL); | |
| 2691 return; | |
| 2692 } | |
| 2693 | |
| 2694 pb->b_flags |= B_ERROR; | |
| 2695 md_kstat_done(ui, pb, (ps->ps_flags & MD_MPS_WRITE_AFTER_READ)); | |
| 2696 MPS_FREE(mirror_parent_cache, ps); | |
| 2697 md_unit_readerexit(ui); | |
| 2698 md_biodone(pb); | |
| 2699 } | |
| 2700 | |
| 2701 static void | |
| 2702 error_update_unit(md_mps_t *ps) | |
| 2703 { | |
| 2704 mm_unit_t *un; | |
| 2705 mdi_unit_t *ui; | |
| 2706 int smi; /* sub mirror index */ | |
| 2707 int ci; /* errored component */ | |
| 2708 set_t setno; | |
| 2709 uint_t flags; /* for set_sm_comp_state() */ | |
| 2710 uint_t hspflags; /* for check_comp_4_hotspares() */ | |
| 2711 | |
| 2712 ui = ps->ps_ui; | |
| 2713 un = (mm_unit_t *)md_unit_writerlock(ui); | |
| 2714 setno = MD_UN2SET(un); | |
| 2715 | |
| 2716 /* All of these updates have to propagated in case of MN set */ | |
| 2717 flags = MD_STATE_XMIT; | |
| 2718 hspflags = MD_HOTSPARE_XMIT; | |
| 2719 | |
| 2720 /* special treatment if we are called during updating watermarks */ | |
| 2721 if (ps->ps_flags & MD_MPS_WMUPDATE) { | |
| 2722 flags |= MD_STATE_WMUPDATE; | |
| 2723 hspflags |= MD_HOTSPARE_WMUPDATE; | |
| 2724 } | |
| 2725 smi = 0; | |
| 2726 ci = 0; | |
| 2727 while (mirror_geterror(un, &smi, &ci, 1, 0) != 0) { | |
| 2728 if (mirror_other_sources(un, smi, ci, 0) == 1) { | |
| 2729 | |
| 2730 /* Never called from ioctl context, so (IOLOCK *)NULL */ | |
| 2731 set_sm_comp_state(un, smi, ci, CS_LAST_ERRED, 0, flags, | |
| 2732 (IOLOCK *)NULL); | |
| 2733 /* | |
| 2734 * For a MN set, the NOTIFY is done when the state | |
| 2735 * change is processed on each node | |
| 2736 */ | |
| 2737 if (!MD_MNSET_SETNO(MD_UN2SET(un))) { | |
| 2738 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_LASTERRED, | |
| 2739 SVM_TAG_METADEVICE, setno, MD_SID(un)); | |
| 2740 } | |
| 2741 continue; | |
| 2742 } | |
| 2743 /* Never called from ioctl context, so (IOLOCK *)NULL */ | |
| 2744 set_sm_comp_state(un, smi, ci, CS_ERRED, 0, flags, | |
| 2745 (IOLOCK *)NULL); | |
| 2746 /* | |
| 2747 * For a MN set, the NOTIFY is done when the state | |
| 2748 * change is processed on each node | |
| 2749 */ | |
| 2750 if (!MD_MNSET_SETNO(MD_UN2SET(un))) { | |
| 2751 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_ERRED, | |
| 2752 SVM_TAG_METADEVICE, setno, MD_SID(un)); | |
| 2753 } | |
| 2754 smi = 0; | |
| 2755 ci = 0; | |
| 2756 } | |
| 2757 | |
| 2758 md_unit_writerexit(ui); | |
| 2759 if (MD_MNSET_SETNO(setno)) { | |
| 2760 send_poke_hotspares(setno); | |
| 2761 } else { | |
| 2762 (void) poke_hotspares(); | |
| 2763 } | |
| 2764 (void) md_unit_readerlock(ui); | |
| 2765 | |
| 2766 finish_error(ps); | |
| 2767 } | |
| 2768 | |
| 2769 /* | |
| 2770 * When we have a B_FAILFAST IO error on a Last Erred component we need to | |
| 2771 * retry the IO without B_FAILFAST set so that we try to ensure that the | |
| 2772 * component "sees" each IO. | |
| 2773 */ | |
| 2774 static void | |
| 2775 last_err_retry(md_mcs_t *cs) | |
| 2776 { | |
| 2777 struct buf *cb; | |
| 2778 md_mps_t *ps; | |
| 2779 uint_t flags; | |
| 2780 | |
| 2781 cb = &cs->cs_buf; | |
| 2782 cb->b_flags &= ~B_FAILFAST; | |
| 2783 | |
| 2784 /* if we're panicing just let this I/O error out */ | |
| 2785 if (panicstr) { | |
| 2786 (void) mirror_done(cb); | |
| 2787 return; | |
| 2788 } | |
| 2789 | |
| 2790 /* reissue the I/O */ | |
| 2791 | |
| 2792 ps = cs->cs_ps; | |
| 2793 | |
| 2794 bioerror(cb, 0); | |
| 2795 | |
| 2796 mutex_enter(&ps->ps_mx); | |
| 2797 | |
| 2798 flags = MD_STR_NOTTOP; | |
| 2799 if (ps->ps_flags & MD_MPS_MAPPED) | |
| 2800 flags |= MD_STR_MAPPED; | |
| 2801 if (ps->ps_flags & MD_MPS_NOBLOCK) | |
| 2802 flags |= MD_NOBLOCK; | |
| 2803 | |
| 2804 mutex_exit(&ps->ps_mx); | |
| 2805 | |
| 2806 clear_retry_error(cb); | |
| 2807 | |
| 2808 cmn_err(CE_NOTE, "!md: %s: Last Erred, retry I/O without B_FAILFAST", | |
| 2809 md_shortname(getminor(cb->b_edev))); | |
| 2810 | |
| 2811 md_call_strategy(cb, flags, NULL); | |
| 2812 } | |
| 2813 | |
| 2814 static void | |
| 2815 mirror_error(md_mps_t *ps) | |
| 2816 { | |
| 2817 int smi; /* sub mirror index */ | |
| 2818 int ci; /* errored component */ | |
| 2819 | |
| 2820 if (panicstr) { | |
| 2821 finish_error(ps); | |
| 2822 return; | |
| 2823 } | |
| 2824 | |
| 2825 if (ps->ps_flags & MD_MPS_ON_OVERLAP) | |
| 2826 mirror_overlap_chain_remove(ps); | |
| 2827 | |
| 2828 smi = 0; | |
| 2829 ci = 0; | |
| 2830 if (mirror_geterror(ps->ps_un, &smi, &ci, 0, 0) != 0) { | |
| 2831 md_unit_readerexit(ps->ps_ui); | |
| 2832 daemon_request(&md_mstr_daemon, error_update_unit, | |
| 2833 (daemon_queue_t *)ps, REQ_OLD); | |
| 2834 return; | |
| 2835 } | |
| 2836 | |
| 2837 finish_error(ps); | |
| 2838 } | |
| 2839 | |
| 2840 static int | |
| 2841 copy_write_done(struct buf *cb) | |
| 2842 { | |
| 2843 md_mps_t *ps; | |
| 2844 buf_t *pb; | |
| 2845 char *wowbuf; | |
| 2846 wowhdr_t *wowhdr; | |
| 2847 ssize_t wow_resid; | |
| 2848 | |
| 2849 /* get wowbuf ans save structure */ | |
| 2850 wowbuf = cb->b_un.b_addr; | |
| 2851 wowhdr = WOWBUF_HDR(wowbuf); | |
| 2852 ps = wowhdr->wow_ps; | |
| 2853 pb = ps->ps_bp; | |
| 2854 | |
| 2855 /* Save error information, then free cb */ | |
| 2856 if (cb->b_flags & B_ERROR) | |
| 2857 pb->b_flags |= B_ERROR; | |
| 2858 | |
| 2859 if (cb->b_flags & B_REMAPPED) | |
| 2860 bp_mapout(cb); | |
| 2861 | |
| 2862 freerbuf(cb); | |
| 2863 | |
| 2864 /* update residual and continue if needed */ | |
| 2865 if ((pb->b_flags & B_ERROR) == 0) { | |
| 2866 wow_resid = pb->b_bcount - wowhdr->wow_offset; | |
| 2867 pb->b_resid = wow_resid; | |
| 2868 if (wow_resid > 0) { | |
| 2869 daemon_request(&md_mstr_daemon, copy_write_cont, | |
| 2870 (daemon_queue_t *)wowhdr, REQ_OLD); | |
| 2871 return (1); | |
| 2872 } | |
| 2873 } | |
| 2874 | |
| 2875 /* Write is complete, release resources. */ | |
| 2876 kmem_cache_free(mirror_wowblk_cache, wowhdr); | |
| 2877 ASSERT(!(ps->ps_flags & MD_MPS_ON_OVERLAP)); | |
| 2878 md_kstat_done(ps->ps_ui, pb, (ps->ps_flags & MD_MPS_WRITE_AFTER_READ)); | |
| 2879 MPS_FREE(mirror_parent_cache, ps); | |
| 2880 md_biodone(pb); | |
| 2881 return (0); | |
| 2882 } | |
| 2883 | |
| 2884 static void | |
| 2885 copy_write_cont(wowhdr_t *wowhdr) | |
| 2886 { | |
| 2887 buf_t *pb; | |
| 2888 buf_t *cb; | |
| 2889 char *wowbuf; | |
| 2890 int wow_offset; | |
| 2891 size_t wow_resid; | |
| 2892 diskaddr_t wow_blkno; | |
| 2893 | |
| 2894 wowbuf = WOWHDR_BUF(wowhdr); | |
| 2895 pb = wowhdr->wow_ps->ps_bp; | |
| 2896 | |
| 2897 /* get data on current location */ | |
| 2898 wow_offset = wowhdr->wow_offset; | |
| 2899 wow_resid = pb->b_bcount - wow_offset; | |
| 2900 wow_blkno = pb->b_lblkno + lbtodb(wow_offset); | |
| 2901 | |
| 2902 /* setup child buffer */ | |
| 2903 cb = getrbuf(KM_SLEEP); | |
| 2904 cb->b_flags = B_WRITE; | |
| 2905 cb->b_edev = pb->b_edev; | |
| 2906 cb->b_un.b_addr = wowbuf; /* change to point at WOWBUF */ | |
| 2907 cb->b_bufsize = md_wowbuf_size; /* change to wowbuf_size */ | |
| 2908 cb->b_iodone = copy_write_done; | |
| 2909 cb->b_bcount = MIN(md_wowbuf_size, wow_resid); | |
| 2910 cb->b_lblkno = wow_blkno; | |
| 2911 | |
| 2912 /* move offset to next section */ | |
| 2913 wowhdr->wow_offset += cb->b_bcount; | |
| 2914 | |
| 2915 /* copy and setup write for current section */ | |
| 2916 bcopy(&pb->b_un.b_addr[wow_offset], wowbuf, cb->b_bcount); | |
| 2917 | |
| 2918 /* do it */ | |
| 2919 /* | |
| 2920 * Do not set the MD_IO_COUNTED flag as this is a new I/O request | |
| 2921 * that handles the WOW condition. The resultant increment on the | |
| 2922 * I/O count variable is cleared by copy_write_done()'s call to | |
| 2923 * md_biodone(). | |
| 2924 */ | |
| 2925 (void) md_mirror_strategy(cb, MD_STR_NOTTOP | MD_STR_WOW | |
| 2926 | MD_STR_MAPPED, NULL); | |
| 2927 } | |
| 2928 | |
| 2929 static void | |
| 2930 md_mirror_copy_write(md_mps_t *ps) | |
| 2931 { | |
| 2932 wowhdr_t *wowhdr; | |
| 2933 | |
| 2934 wowhdr = kmem_cache_alloc(mirror_wowblk_cache, MD_ALLOCFLAGS); | |
| 2935 mirror_wowblk_init(wowhdr); | |
| 2936 wowhdr->wow_ps = ps; | |
| 2937 wowhdr->wow_offset = 0; | |
| 2938 copy_write_cont(wowhdr); | |
| 2939 } | |
| 2940 | |
| 2941 static void | |
| 2942 handle_wow(md_mps_t *ps) | |
| 2943 { | |
| 2944 buf_t *pb; | |
| 2945 | |
| 2946 pb = ps->ps_bp; | |
| 2947 | |
| 2948 bp_mapin(pb); | |
| 2949 | |
| 2950 md_mirror_wow_cnt++; | |
| 2951 if (!(pb->b_flags & B_PHYS) && (md_mirror_wow_flg & WOW_LOGIT)) { | |
| 2952 cmn_err(CE_NOTE, | |
| 2953 "md: %s, blk %lld, cnt %ld: Write on write %d occurred", | |
| 2954 md_shortname(getminor(pb->b_edev)), | |
| 2955 (longlong_t)pb->b_lblkno, pb->b_bcount, md_mirror_wow_cnt); | |
| 2956 } | |
| 2957 | |
| 2958 /* | |
| 2959 * Set the MD_IO_COUNTED flag as we are retrying the same I/O | |
| 2960 * operation therefore this I/O request has already been counted, | |
| 2961 * the I/O count variable will be decremented by mirror_done()'s | |
| 2962 * call to md_biodone(). | |
| 2963 */ | |
| 2964 if (md_mirror_wow_flg & WOW_NOCOPY) | |
| 2965 (void) md_mirror_strategy(pb, MD_STR_NOTTOP | MD_STR_WOW | | |
| 2966 MD_STR_MAPPED | MD_IO_COUNTED, ps); | |
| 2967 else | |
| 2968 md_mirror_copy_write(ps); | |
| 2969 } | |
| 2970 | |
| 2971 /* | |
| 2972 * Return true if the specified submirror is either in the Last Erred | |
| 2973 * state or is transitioning into the Last Erred state. | |
| 2974 */ | |
| 2975 static bool_t | |
| 2976 submirror_is_lasterred(mm_unit_t *un, int smi) | |
| 2977 { | |
| 2978 mm_submirror_t *sm; | |
| 2979 mm_submirror_ic_t *smic; | |
| 2980 md_m_shared_t *shared; | |
| 2981 int ci; | |
| 2982 int compcnt; | |
| 2983 | |
| 2984 sm = &un->un_sm[smi]; | |
| 2985 smic = &un->un_smic[smi]; | |
| 2986 | |
| 2987 compcnt = (*(smic->sm_get_component_count)) (sm->sm_dev, un); | |
| 2988 for (ci = 0; ci < compcnt; ci++) { | |
| 2989 shared = (md_m_shared_t *)(*(smic->sm_shared_by_indx)) | |
| 2990 (sm->sm_dev, sm, ci); | |
| 2991 | |
| 2992 if (shared->ms_state == CS_LAST_ERRED) | |
| 2993 return (B_TRUE); | |
| 2994 | |
| 2995 /* | |
| 2996 * It is not currently Last Erred, check if entering Last Erred. | |
| 2997 */ | |
| 2998 if ((shared->ms_flags & MDM_S_IOERR) && | |
| 2999 ((shared->ms_state == CS_OKAY) || | |
| 3000 (shared->ms_state == CS_RESYNC))) { | |
| 3001 if (mirror_other_sources(un, smi, ci, 0) == 1) | |
| 3002 return (B_TRUE); | |
| 3003 } | |
| 3004 } | |
| 3005 | |
| 3006 return (B_FALSE); | |
| 3007 } | |
| 3008 | |
| 3009 | |
| 3010 static int | |
| 3011 mirror_done(struct buf *cb) | |
| 3012 { | |
| 3013 md_mps_t *ps; | |
| 3014 md_mcs_t *cs; | |
| 3015 | |
| 3016 /*LINTED*/ | |
| 3017 cs = (md_mcs_t *)((caddr_t)cb - md_mirror_mcs_buf_off); | |
| 3018 ps = cs->cs_ps; | |
| 3019 | |
| 3020 mutex_enter(&ps->ps_mx); | |
| 3021 | |
| 3022 /* check if we need to retry an errored failfast I/O */ | |
| 3023 if (cb->b_flags & B_ERROR) { | |
| 3024 struct buf *pb = ps->ps_bp; | |
| 3025 | |
| 3026 if (cb->b_flags & B_FAILFAST) { | |
| 3027 int i; | |
| 3028 mm_unit_t *un = ps->ps_un; | |
| 3029 | |
| 3030 for (i = 0; i < NMIRROR; i++) { | |
| 3031 if (!SMS_BY_INDEX_IS(un, i, SMS_INUSE)) | |
| 3032 continue; | |
| 3033 | |
| 3034 if (cb->b_edev == | |
| 3035 md_dev64_to_dev(un->un_sm[i].sm_dev)) { | |
| 3036 | |
| 3037 /* | |
| 3038 * This is the submirror that had the | |
| 3039 * error. Check if it is Last Erred. | |
| 3040 */ | |
| 3041 if (submirror_is_lasterred(un, i)) { | |
| 3042 daemon_queue_t *dqp; | |
| 3043 | |
| 3044 mutex_exit(&ps->ps_mx); | |
| 3045 dqp = (daemon_queue_t *)cs; | |
| 3046 dqp->dq_prev = NULL; | |
| 3047 dqp->dq_next = NULL; | |
| 3048 daemon_request(&md_done_daemon, | |
| 3049 last_err_retry, dqp, | |
| 3050 REQ_OLD); | |
| 3051 return (1); | |
| 3052 } | |
| 3053 break; | |
| 3054 } | |
| 3055 } | |
| 3056 } | |
| 3057 | |
| 3058 /* continue to process the buf without doing a retry */ | |
| 3059 ps->ps_flags |= MD_MPS_ERROR; | |
| 3060 pb->b_error = cb->b_error; | |
| 3061 } | |
| 3062 | |
| 3063 return (mirror_done_common(cb)); | |
| 3064 } | |
| 3065 | |
| 3066 /* | |
| 3067 * Split from the original mirror_done function so we can handle bufs after a | |
| 3068 * retry. | |
| 3069 * ps->ps_mx is already held in the caller of this function and the cb error | |
| 3070 * has already been checked and handled in the caller. | |
| 3071 */ | |
| 3072 static int | |
| 3073 mirror_done_common(struct buf *cb) | |
| 3074 { | |
| 3075 struct buf *pb; | |
| 3076 mm_unit_t *un; | |
| 3077 mdi_unit_t *ui; | |
| 3078 md_mps_t *ps; | |
| 3079 md_mcs_t *cs; | |
| 3080 size_t end_rr, start_rr, current_rr; | |
| 3081 | |
| 3082 /*LINTED*/ | |
| 3083 cs = (md_mcs_t *)((caddr_t)cb - md_mirror_mcs_buf_off); | |
| 3084 ps = cs->cs_ps; | |
| 3085 pb = ps->ps_bp; | |
| 3086 | |
| 3087 if (cb->b_flags & B_REMAPPED) | |
| 3088 bp_mapout(cb); | |
| 3089 | |
| 3090 ps->ps_frags--; | |
| 3091 if (ps->ps_frags != 0) { | |
| 3092 mutex_exit(&ps->ps_mx); | |
| 3093 kmem_cache_free(mirror_child_cache, cs); | |
| 3094 return (1); | |
| 3095 } | |
| 3096 un = ps->ps_un; | |
| 3097 ui = ps->ps_ui; | |
| 3098 | |
| 3099 /* | |
| 3100 * Do not update outstanding_writes if we're running with ABR | |
| 3101 * set for this mirror or the write() was issued with MD_STR_ABR set. | |
| 3102 * Also a resync initiated write() has no outstanding_writes update | |
| 3103 * either. | |
| 3104 */ | |
| 3105 if (((cb->b_flags & B_READ) == 0) && | |
| 3106 (un->un_nsm >= 2) && | |
| 3107 (ps->ps_call == NULL) && | |
| 3108 !((ui->ui_tstate & MD_ABR_CAP) || (ps->ps_flags & MD_MPS_ABR)) && | |
| 3109 !(ps->ps_flags & MD_MPS_WRITE_AFTER_READ)) { | |
| 3110 BLK_TO_RR(end_rr, ps->ps_lastblk, un); | |
| 3111 BLK_TO_RR(start_rr, ps->ps_firstblk, un); | |
| 3112 mutex_enter(&un->un_resync_mx); | |
| 3113 for (current_rr = start_rr; current_rr <= end_rr; current_rr++) | |
| 3114 un->un_outstanding_writes[current_rr]--; | |
| 3115 mutex_exit(&un->un_resync_mx); | |
| 3116 } | |
| 3117 kmem_cache_free(mirror_child_cache, cs); | |
| 3118 mutex_exit(&ps->ps_mx); | |
| 3119 | |
| 3120 if (ps->ps_call != NULL) { | |
| 3121 daemon_request(&md_done_daemon, ps->ps_call, | |
| 3122 (daemon_queue_t *)ps, REQ_OLD); | |
| 3123 return (1); | |
| 3124 } | |
| 3125 | |
| 3126 if ((ps->ps_flags & MD_MPS_ERROR)) { | |
| 3127 daemon_request(&md_done_daemon, mirror_error, | |
| 3128 (daemon_queue_t *)ps, REQ_OLD); | |
| 3129 return (1); | |
| 3130 } | |
| 3131 | |
| 3132 if (ps->ps_flags & MD_MPS_ON_OVERLAP) | |
| 3133 mirror_overlap_chain_remove(ps); | |
| 3134 | |
| 3135 /* | |
| 3136 * Handle Write-on-Write problem. | |
| 3137 * Skip In case of Raw and Direct I/O as they are | |
| 3138 * handled earlier. | |
| 3139 * | |
| 3140 */ | |
| 3141 if (!(md_mirror_wow_flg & WOW_DISABLE) && | |
| 3142 !(pb->b_flags & B_READ) && | |
| 3143 !(ps->ps_flags & MD_MPS_WOW) && | |
| 3144 !(pb->b_flags & B_PHYS) && | |
| 3145 any_pages_dirty(pb)) { | |
| 3146 md_unit_readerexit(ps->ps_ui); | |
| 3147 daemon_request(&md_mstr_daemon, handle_wow, | |
| 3148 (daemon_queue_t *)ps, REQ_OLD); | |
| 3149 return (1); | |
| 3150 } | |
| 3151 | |
| 3152 md_kstat_done(ui, pb, (ps->ps_flags & MD_MPS_WRITE_AFTER_READ)); | |
| 3153 MPS_FREE(mirror_parent_cache, ps); | |
| 3154 md_unit_readerexit(ui); | |
| 3155 md_biodone(pb); | |
| 3156 return (0); | |
| 3157 } | |
| 3158 | |
| 3159 /* | |
| 3160 * Clear error state in submirror component if the retry worked after | |
| 3161 * a failfast error. | |
| 3162 */ | |
| 3163 static void | |
| 3164 clear_retry_error(struct buf *cb) | |
| 3165 { | |
| 3166 int smi; | |
| 3167 md_mcs_t *cs; | |
| 3168 mm_unit_t *un; | |
| 3169 mdi_unit_t *ui_sm; | |
| 3170 mm_submirror_t *sm; | |
| 3171 mm_submirror_ic_t *smic; | |
| 3172 u_longlong_t cnt; | |
| 3173 md_m_shared_t *shared; | |
| 3174 | |
| 3175 /*LINTED*/ | |
| 3176 cs = (md_mcs_t *)((caddr_t)cb - md_mirror_mcs_buf_off); | |
| 3177 un = cs->cs_ps->ps_un; | |
| 3178 | |
| 3179 for (smi = 0; smi < NMIRROR; smi++) { | |
| 3180 if (!SMS_BY_INDEX_IS(un, smi, SMS_INUSE)) | |
| 3181 continue; | |
| 3182 | |
| 3183 if (cb->b_edev == md_dev64_to_dev(un->un_sm[smi].sm_dev)) { | |
| 3184 break; | |
| 3185 } | |
| 3186 } | |
| 3187 | |
| 3188 if (smi >= NMIRROR) | |
| 3189 return; | |
| 3190 | |
| 3191 sm = &un->un_sm[smi]; | |
| 3192 smic = &un->un_smic[smi]; | |
| 3193 cnt = cb->b_bcount; | |
| 3194 | |
| 3195 ui_sm = MDI_UNIT(getminor(cb->b_edev)); | |
| 3196 (void) md_unit_writerlock(ui_sm); | |
| 3197 | |
| 3198 shared = (md_m_shared_t *)(*(smic->sm_shared_by_blk))(sm->sm_dev, sm, | |
| 3199 cb->b_blkno, &cnt); | |
| 3200 | |
| 3201 if (shared->ms_flags & MDM_S_IOERR) { | |
| 3202 shared->ms_flags &= ~MDM_S_IOERR; | |
| 3203 | |
| 3204 } else { | |
| 3205 /* the I/O buf spans components and the first one is not erred */ | |
| 3206 int cnt; | |
| 3207 int i; | |
| 3208 | |
| 3209 cnt = (*(smic->sm_get_component_count))(sm->sm_dev, un); | |
| 3210 for (i = 0; i < cnt; i++) { | |
| 3211 shared = (md_m_shared_t *)(*(smic->sm_shared_by_indx)) | |
| 3212 (sm->sm_dev, sm, i); | |
| 3213 | |
| 3214 if (shared->ms_flags & MDM_S_IOERR && | |
| 3215 shared->ms_state == CS_OKAY) { | |
| 3216 | |
| 3217 shared->ms_flags &= ~MDM_S_IOERR; | |
| 3218 break; | |
| 3219 } | |
| 3220 } | |
| 3221 } | |
| 3222 | |
| 3223 md_unit_writerexit(ui_sm); | |
| 3224 } | |
| 3225 | |
| 3226 static size_t | |
| 3227 mirror_map_read( | |
| 3228 md_mps_t *ps, | |
| 3229 md_mcs_t *cs, | |
| 3230 diskaddr_t blkno, | |
| 3231 u_longlong_t count | |
| 3232 ) | |
| 3233 { | |
| 3234 mm_unit_t *un; | |
| 3235 buf_t *bp; | |
| 3236 u_longlong_t cando; | |
| 3237 | |
| 3238 bp = &cs->cs_buf; | |
| 3239 un = ps->ps_un; | |
| 3240 | |
| 3241 bp->b_lblkno = blkno; | |
| 3242 if (fast_select_read_unit(ps, cs) == 0) { | |
| 3243 bp->b_bcount = ldbtob(count); | |
| 3244 return (0); | |
| 3245 } | |
| 3246 bp->b_edev = md_dev64_to_dev(select_read_unit(un, blkno, count, &cando, | |
| 3247 0, NULL, cs)); | |
| 3248 bp->b_bcount = ldbtob(cando); | |
| 3249 if (count != cando) | |
| 3250 return (cando); | |
| 3251 return (0); | |
| 3252 } | |
| 3253 | |
| 3254 static void | |
| 3255 write_after_read(md_mps_t *ps) | |
| 3256 { | |
| 3257 struct buf *pb; | |
| 3258 int flags; | |
| 3259 | |
| 3260 if (ps->ps_flags & MD_MPS_ERROR) { | |
| 3261 mirror_error(ps); | |
| 3262 return; | |
| 3263 } | |
| 3264 | |
| 3265 pb = ps->ps_bp; | |
| 3266 md_kstat_done(ps->ps_ui, pb, (ps->ps_flags & MD_MPS_WRITE_AFTER_READ)); | |
| 3267 ps->ps_call = NULL; | |
| 3268 ps->ps_flags |= MD_MPS_WRITE_AFTER_READ; | |
| 3269 flags = MD_STR_NOTTOP | MD_STR_WAR; | |
| 3270 if (ps->ps_flags & MD_MPS_MAPPED) | |
| 3271 flags |= MD_STR_MAPPED; | |
| 3272 if (ps->ps_flags & MD_MPS_NOBLOCK) | |
| 3273 flags |= MD_NOBLOCK; | |
| 3274 if (ps->ps_flags & MD_MPS_DIRTY_RD) | |
| 3275 flags |= MD_STR_DIRTY_RD; | |
| 3276 (void) mirror_write_strategy(pb, flags, ps); | |
| 3277 } | |
| 3278 | |
| 3279 static void | |
| 3280 continue_serial(md_mps_t *ps) | |
| 3281 { | |
| 3282 md_mcs_t *cs; | |
| 3283 buf_t *cb; | |
| 3284 mm_unit_t *un; | |
| 3285 int flags; | |
| 3286 | |
| 3287 un = ps->ps_un; | |
| 3288 cs = kmem_cache_alloc(mirror_child_cache, MD_ALLOCFLAGS); | |
| 3289 mirror_child_init(cs); | |
| 3290 cb = &cs->cs_buf; | |
| 3291 ps->ps_call = NULL; | |
| 3292 ps->ps_frags = 1; | |
| 3293 (void) mirror_map_write(un, cs, ps, 0); | |
| 3294 flags = MD_STR_NOTTOP; | |
| 3295 if (ps->ps_flags & MD_MPS_MAPPED) | |
| 3296 flags |= MD_STR_MAPPED; | |
| 3297 md_call_strategy(cb, flags, NULL); | |
| 3298 } | |
| 3299 | |
| 3300 static int | |
| 3301 mirror_map_write(mm_unit_t *un, md_mcs_t *cs, md_mps_t *ps, int war) | |
| 3302 { | |
| 3303 int i; | |
| 3304 dev_t dev; /* needed for bioclone, so not md_dev64_t */ | |
| 3305 buf_t *cb; | |
| 3306 buf_t *pb; | |
| 3307 diskaddr_t blkno; | |
| 3308 size_t bcount; | |
| 3309 off_t offset; | |
| 3310 | |
| 3311 pb = ps->ps_bp; | |
| 3312 cb = &cs->cs_buf; | |
| 3313 cs->cs_ps = ps; | |
| 3314 | |
| 3315 i = md_find_nth_unit(ps->ps_writable_sm, ps->ps_current_sm); | |
| 3316 | |
| 3317 dev = md_dev64_to_dev(un->un_sm[i].sm_dev); | |
| 3318 | |
| 3319 blkno = pb->b_lblkno; | |
| 3320 bcount = pb->b_bcount; | |
| 3321 offset = 0; | |
| 3322 if (war && (blkno == 0) && (un->c.un_flag & MD_LABELED)) { | |
| 3323 blkno = DK_LABEL_LOC + 1; | |
| 3324 /* | |
| 3325 * This handles the case where we're requesting | |
| 3326 * a write to block 0 on a label partition | |
| 3327 * and the request size was smaller than the | |
| 3328 * size of the label. If this is the case | |
| 3329 * then we'll return -1. Failure to do so will | |
| 3330 * either cause the calling thread to hang due to | |
| 3331 * an ssd bug, or worse if the bcount were allowed | |
| 3332 * to go negative (ie large). | |
| 3333 */ | |
| 3334 if (bcount <= DEV_BSIZE*(DK_LABEL_LOC + 1)) | |
| 3335 return (-1); | |
| 3336 bcount -= (DEV_BSIZE*(DK_LABEL_LOC + 1)); | |
| 3337 offset = (DEV_BSIZE*(DK_LABEL_LOC + 1)); | |
| 3338 } | |
| 3339 | |
| 3340 cb = md_bioclone(pb, offset, bcount, dev, blkno, mirror_done, | |
| 3341 cb, KM_NOSLEEP); | |
| 3342 if (war) | |
| 3343 cb->b_flags = (cb->b_flags & ~B_READ) | B_WRITE; | |
| 3344 | |
| 3345 /* | |
| 3346 * If the submirror is in the erred stated, check if any component is | |
| 3347 * in the Last Erred state. If so, we don't want to use the B_FAILFAST | |
| 3348 * flag on the IO. | |
| 3349 * | |
| 3350 * Provide a fast path for the non-erred case (which should be the | |
| 3351 * normal case). | |
| 3352 */ | |
| 3353 if (un->un_sm[i].sm_flags & MD_SM_FAILFAST) { | |
| 3354 if (un->un_sm[i].sm_state & SMS_COMP_ERRED) { | |
| 3355 mm_submirror_t *sm; | |
| 3356 mm_submirror_ic_t *smic; | |
| 3357 int ci; | |
| 3358 int compcnt; | |
| 3359 | |
| 3360 sm = &un->un_sm[i]; | |
| 3361 smic = &un->un_smic[i]; | |
| 3362 | |
| 3363 compcnt = (*(smic->sm_get_component_count)) | |
| 3364 (sm->sm_dev, un); | |
| 3365 for (ci = 0; ci < compcnt; ci++) { | |
| 3366 md_m_shared_t *shared; | |
| 3367 | |
| 3368 shared = (md_m_shared_t *) | |
| 3369 (*(smic->sm_shared_by_indx))(sm->sm_dev, | |
| 3370 sm, ci); | |
| 3371 | |
| 3372 if (shared->ms_state == CS_LAST_ERRED) | |
| 3373 break; | |
| 3374 } | |
| 3375 if (ci >= compcnt) | |
| 3376 cb->b_flags |= B_FAILFAST; | |
| 3377 | |
| 3378 } else { | |
| 3379 cb->b_flags |= B_FAILFAST; | |
| 3380 } | |
| 3381 } | |
| 3382 | |
| 3383 ps->ps_current_sm++; | |
| 3384 if (ps->ps_current_sm != ps->ps_active_cnt) { | |
| 3385 if (un->un_write_option == WR_SERIAL) { | |
| 3386 ps->ps_call = continue_serial; | |
| 3387 return (0); | |
| 3388 } | |
| 3389 return (1); | |
| 3390 } | |
| 3391 return (0); | |
| 3392 } | |
| 3393 | |
| 3394 /* | |
| 3395 * directed_read_done: | |
| 3396 * ------------------ | |
| 3397 * Completion routine called when a DMR request has been returned from the | |
| 3398 * underlying driver. Wake-up the original ioctl() and return the data to | |
| 3399 * the user. | |
| 3400 */ | |
| 3401 static void | |
| 3402 directed_read_done(md_mps_t *ps) | |
| 3403 { | |
| 3404 mm_unit_t *un; | |
| 3405 mdi_unit_t *ui; | |
| 3406 | |
| 3407 un = ps->ps_un; | |
| 3408 ui = ps->ps_ui; | |
| 3409 | |
| 3410 md_unit_readerexit(ui); | |
| 3411 md_kstat_done(ui, ps->ps_bp, (ps->ps_flags & MD_MPS_WRITE_AFTER_READ)); | |
| 3412 ps->ps_call = NULL; | |
| 3413 | |
| 3414 mutex_enter(&un->un_dmr_mx); | |
| 3415 cv_signal(&un->un_dmr_cv); | |
| 3416 mutex_exit(&un->un_dmr_mx); | |
| 3417 | |
| 3418 /* release the parent structure */ | |
| 3419 kmem_cache_free(mirror_parent_cache, ps); | |
| 3420 } | |
| 3421 | |
| 3422 /* | |
| 3423 * daemon_io: | |
| 3424 * ------------ | |
| 3425 * Called to issue a mirror_write_strategy() or mirror_read_strategy | |
| 3426 * call from a blockable context. NOTE: no mutex can be held on entry to this | |
| 3427 * routine | |
| 3428 */ | |
| 3429 static void | |
| 3430 daemon_io(daemon_queue_t *dq) | |
| 3431 { | |
| 3432 md_mps_t *ps = (md_mps_t *)dq; | |
| 3433 int flag = MD_STR_NOTTOP; | |
| 3434 buf_t *pb = ps->ps_bp; | |
| 3435 | |
| 3436 if (ps->ps_flags & MD_MPS_MAPPED) | |
| 3437 flag |= MD_STR_MAPPED; | |
| 3438 if (ps->ps_flags & MD_MPS_WOW) | |
| 3439 flag |= MD_STR_WOW; | |
| 3440 if (ps->ps_flags & MD_MPS_WRITE_AFTER_READ) | |
| 3441 flag |= MD_STR_WAR; | |
| 3442 if (ps->ps_flags & MD_MPS_ABR) | |
| 3443 flag |= MD_STR_ABR; | |
| 3444 | |
| 3445 /* | |
| 3446 * If this is a resync read, ie MD_STR_DIRTY_RD not set, set | |
| 3447 * MD_STR_WAR before calling mirror_read_strategy | |
| 3448 */ | |
| 3449 if (pb->b_flags & B_READ) { | |
| 3450 if (!(ps->ps_flags & MD_MPS_DIRTY_RD)) | |
| 3451 flag |= MD_STR_WAR; | |
| 3452 mirror_read_strategy(pb, flag, ps); | |
| 3453 } else | |
| 3454 mirror_write_strategy(pb, flag, ps); | |
| 3455 } | |
| 3456 | |
| 3457 /* | |
| 3458 * update_resync: | |
| 3459 * ------------- | |
| 3460 * Called to update the in-core version of the resync record with the latest | |
| 3461 * version that was committed to disk when the previous mirror owner | |
| 3462 * relinquished ownership. This call is likely to block as we must hold-off | |
| 3463 * any current resync processing that may be occurring. | |
| 3464 * On completion of the resync record update we issue the mirror_write_strategy | |
| 3465 * call to complete the i/o that first started this sequence. To remove a race | |
| 3466 * condition between a new write() request which is submitted and the resync | |
| 3467 * record update we acquire the writerlock. This will hold off all i/o to the | |
| 3468 * mirror until the resync update has completed. | |
| 3469 * NOTE: no mutex can be held on entry to this routine | |
| 3470 */ | |
| 3471 static void | |
| 3472 update_resync(daemon_queue_t *dq) | |
| 3473 { | |
| 3474 md_mps_t *ps = (md_mps_t *)dq; | |
| 3475 buf_t *pb = ps->ps_bp; | |
| 3476 mdi_unit_t *ui = ps->ps_ui; | |
| 3477 mm_unit_t *un; | |
| 3478 set_t setno; | |
| 3479 int restart_resync; | |
| 3480 | |
| 3481 un = md_unit_writerlock(ui); | |
| 3482 ps->ps_un = un; | |
| 3483 setno = MD_MIN2SET(getminor(pb->b_edev)); | |
| 3484 if (mddb_reread_rr(setno, un->un_rr_dirty_recid) == 0) { | |
| 3485 /* | |
| 3486 * Synchronize our in-core view of what regions need to be | |
| 3487 * resync'd with the on-disk version. | |
| 3488 */ | |
| 3489 mutex_enter(&un->un_rrp_inflight_mx); | |
| 3490 mirror_copy_rr(howmany(un->un_rrd_num, NBBY), un->un_resync_bm, | |
| 3491 un->un_dirty_bm); | |
| 3492 mutex_exit(&un->un_rrp_inflight_mx); | |
| 3493 | |
| 3494 /* Region dirty map is now up to date */ | |
| 3495 } | |
| 3496 restart_resync = (un->un_rs_thread_flags & MD_RI_BLOCK_OWNER) ? 1 : 0; | |
| 3497 md_unit_writerexit(ui); | |
| 3498 | |
| 3499 /* Restart the resync thread if it was previously blocked */ | |
| 3500 if (restart_resync) { | |
| 3501 mutex_enter(&un->un_rs_thread_mx); | |
| 3502 un->un_rs_thread_flags &= ~MD_RI_BLOCK_OWNER; | |
| 3503 cv_signal(&un->un_rs_thread_cv); | |
| 3504 mutex_exit(&un->un_rs_thread_mx); | |
| 3505 } | |
| 3506 /* Continue with original deferred i/o */ | |
| 3507 daemon_io(dq); | |
| 3508 } | |
| 3509 | |
| 3510 /* | |
| 3511 * owner_timeout: | |
| 3512 * ------------- | |
| 3513 * Called if the original mdmn_ksend_message() failed and the request is to be | |
| 3514 * retried. Reattempt the original ownership change. | |
| 3515 * | |
| 3516 * NOTE: called at interrupt context (see timeout(9f)). | |
| 3517 */ | |
| 3518 static void | |
| 3519 owner_timeout(void *arg) | |
| 3520 { | |
| 3521 daemon_queue_t *dq = (daemon_queue_t *)arg; | |
| 3522 | |
| 3523 daemon_request(&md_mirror_daemon, become_owner, dq, REQ_OLD); | |
| 3524 } | |
| 3525 | |
| 3526 /* | |
| 3527 * become_owner: | |
| 3528 * ------------ | |
| 3529 * Called to issue RPC request to become the owner of the mirror | |
| 3530 * associated with this i/o request. We assume that the ownership request | |
| 3531 * is synchronous, so if it succeeds we will issue the request via | |
| 3532 * mirror_write_strategy(). | |
| 3533 * If multiple i/o's are outstanding we will be called from the mirror_daemon | |
| 3534 * service thread. | |
| 3535 * NOTE: no mutex should be held on entry to this routine. | |
| 3536 */ | |
| 3537 static void | |
| 3538 become_owner(daemon_queue_t *dq) | |
| 3539 { | |
| 3540 md_mps_t *ps = (md_mps_t *)dq; | |
| 3541 mm_unit_t *un = ps->ps_un; | |
| 3542 buf_t *pb = ps->ps_bp; | |
| 3543 set_t setno; | |
| 3544 md_mn_kresult_t *kres; | |
| 3545 int msg_flags = md_mirror_msg_flags; | |
| 3546 md_mps_t *ps1; | |
| 3547 | |
| 3548 ASSERT(dq->dq_next == NULL && dq->dq_prev == NULL); | |
| 3549 | |
| 3550 /* | |
| 3551 * If we're already the mirror owner we do not need to send a message | |
| 3552 * but can simply process the i/o request immediately. | |
| 3553 * If we've already sent the request to become owner we requeue the | |
| 3554 * request as we're waiting for the synchronous ownership message to | |
| 3555 * be processed. | |
| 3556 */ | |
| 3557 if (MD_MN_MIRROR_OWNER(un)) { | |
| 3558 /* | |
| 3559 * As the strategy() call will potentially block we need to | |
| 3560 * punt this to a separate thread and complete this request | |
| 3561 * as quickly as possible. Note: if we're a read request | |
| 3562 * this must be a resync, we cannot afford to be queued | |
| 3563 * behind any intervening i/o requests. In this case we put the | |
| 3564 * request on the md_mirror_rs_daemon queue. | |
| 3565 */ | |
| 3566 if (pb->b_flags & B_READ) { | |
| 3567 daemon_request(&md_mirror_rs_daemon, daemon_io, dq, | |
| 3568 REQ_OLD); | |
| 3569 } else { | |
| 3570 daemon_request(&md_mirror_io_daemon, daemon_io, dq, | |
| 3571 REQ_OLD); | |
| 3572 } | |
| 3573 } else { | |
| 3574 mutex_enter(&un->un_owner_mx); | |
| 3575 if ((un->un_owner_state & MM_MN_OWNER_SENT) == 0) { | |
| 3576 md_mn_req_owner_t *msg; | |
| 3577 int rval = 0; | |
| 3578 | |
| 3579 /* | |
| 3580 * Check to see that we haven't exceeded the maximum | |
| 3581 * retry count. If we have we fail the i/o as the | |
| 3582 * comms mechanism has become wedged beyond recovery. | |
| 3583 */ | |
| 3584 if (dq->qlen++ >= MD_OWNER_RETRIES) { | |
| 3585 mutex_exit(&un->un_owner_mx); | |
| 3586 cmn_err(CE_WARN, | |
| 3587 "md_mirror: Request exhausted ownership " | |
| 3588 "retry limit of %d attempts", dq->qlen); | |
| 3589 pb->b_error = EIO; | |
| 3590 pb->b_flags |= B_ERROR; | |
| 3591 pb->b_resid = pb->b_bcount; | |
| 3592 kmem_cache_free(mirror_parent_cache, ps); | |
| 3593 md_biodone(pb); | |
| 3594 return; | |
| 3595 } | |
| 3596 | |
| 3597 /* | |
| 3598 * Issue request to change ownership. The call is | |
| 3599 * synchronous so when it returns we can complete the | |
| 3600 * i/o (if successful), or enqueue it again so that | |
| 3601 * the operation will be retried. | |
| 3602 */ | |
| 3603 un->un_owner_state |= MM_MN_OWNER_SENT; | |
| 3604 mutex_exit(&un->un_owner_mx); | |
| 3605 | |
| 3606 msg = kmem_zalloc(sizeof (md_mn_req_owner_t), KM_SLEEP); | |
| 3607 setno = MD_MIN2SET(getminor(pb->b_edev)); | |
| 3608 msg->mnum = MD_SID(un); | |
| 3609 msg->owner = md_mn_mynode_id; | |
| 3610 msg_flags |= MD_MSGF_NO_LOG; | |
| 3611 /* | |
| 3612 * If this IO is triggered by updating a watermark, | |
| 3613 * it might be issued by the creation of a softpartition | |
| 3614 * while the commd subsystem is suspended. | |
| 3615 * We don't want this message to block. | |
| 3616 */ | |
| 3617 if (ps->ps_flags & MD_MPS_WMUPDATE) { | |
| 3618 msg_flags |= MD_MSGF_OVERRIDE_SUSPEND; | |
| 3619 } | |
| 3620 | |
| 3621 kres = kmem_alloc(sizeof (md_mn_kresult_t), KM_SLEEP); | |
| 3622 rval = mdmn_ksend_message(setno, | |
| 3623 MD_MN_MSG_REQUIRE_OWNER, | |
| 3624 msg_flags, /* flags */ | |
| 3625 (char *)msg, | |
| 3626 sizeof (md_mn_req_owner_t), | |
| 3627 kres); | |
| 3628 | |
| 3629 kmem_free(msg, sizeof (md_mn_req_owner_t)); | |
| 3630 | |
| 3631 if (MDMN_KSEND_MSG_OK(rval, kres)) { | |
| 3632 dq->qlen = 0; | |
| 3633 /* | |
| 3634 * Successfully changed owner, reread the | |
| 3635 * resync record so that we have a valid idea of | |
| 3636 * any previously committed incomplete write()s. | |
| 3637 * NOTE: As we need to acquire the resync mutex | |
| 3638 * this may block, so we defer it to a separate | |
| 3639 * thread handler. This makes us (effectively) | |
| 3640 * non-blocking once the ownership message | |
| 3641 * handling has completed. | |
| 3642 */ | |
| 3643 mutex_enter(&un->un_owner_mx); | |
| 3644 if (un->un_owner_state & MM_MN_BECOME_OWNER) { | |
| 3645 un->un_mirror_owner = md_mn_mynode_id; | |
| 3646 /* Sets owner of un_rr_dirty record */ | |
| 3647 if (un->un_rr_dirty_recid) | |
| 3648 (void) mddb_setowner( | |
| 3649 un->un_rr_dirty_recid, | |
| 3650 md_mn_mynode_id); | |
| 3651 un->un_owner_state &= | |
| 3652 ~MM_MN_BECOME_OWNER; | |
| 3653 /* | |
| 3654 * Release the block on the current | |
| 3655 * resync region if it is blocked | |
| 3656 */ | |
| 3657 ps1 = un->un_rs_prev_ovrlap; | |
| 3658 if ((ps1 != NULL) && | |
| 3659 (ps1->ps_flags & MD_MPS_ON_OVERLAP)) | |
| 3660 mirror_overlap_chain_remove( | |
| 3661 ps1); | |
| 3662 mutex_exit(&un->un_owner_mx); | |
| 3663 | |
| 3664 /* | |
| 3665 * If we're a read, this must be a | |
| 3666 * resync request, issue | |
| 3667 * the i/o request on the | |
| 3668 * md_mirror_rs_daemon queue. This is | |
| 3669 * to avoid a deadlock between the | |
| 3670 * resync_unit thread and | |
| 3671 * subsequent i/o requests that may | |
| 3672 * block on the resync region. | |
| 3673 */ | |
| 3674 if (pb->b_flags & B_READ) { | |
| 3675 daemon_request( | |
| 3676 &md_mirror_rs_daemon, | |
| 3677 update_resync, dq, REQ_OLD); | |
| 3678 } else { | |
| 3679 daemon_request( | |
| 3680 &md_mirror_io_daemon, | |
| 3681 update_resync, dq, REQ_OLD); | |
| 3682 } | |
| 3683 kmem_free(kres, | |
| 3684 sizeof (md_mn_kresult_t)); | |
| 3685 return; | |
| 3686 } else { | |
| 3687 /* | |
| 3688 * Some other node has beaten us to | |
| 3689 * obtain ownership. We need to | |
| 3690 * reschedule our ownership request | |
| 3691 */ | |
| 3692 mutex_exit(&un->un_owner_mx); | |
| 3693 } | |
| 3694 } else { | |
| 3695 mdmn_ksend_show_error(rval, kres, | |
| 3696 "MD_MN_MSG_REQUIRE_OWNER"); | |
| 3697 /* | |
| 3698 * Message transport failure is handled by the | |
| 3699 * comms layer. If the ownership change request | |
| 3700 * does not succeed we need to flag the error to | |
| 3701 * the initiator of the i/o. This is handled by | |
| 3702 * the retry logic above. As the request failed | |
| 3703 * we do not know _who_ the owner of the mirror | |
| 3704 * currently is. We reset our idea of the owner | |
| 3705 * to None so that any further write()s will | |
| 3706 * attempt to become the owner again. This stops | |
| 3707 * multiple nodes writing to the same mirror | |
| 3708 * simultaneously. | |
| 3709 */ | |
| 3710 mutex_enter(&un->un_owner_mx); | |
| 3711 un->un_owner_state &= | |
| 3712 ~(MM_MN_OWNER_SENT|MM_MN_BECOME_OWNER); | |
| 3713 un->un_mirror_owner = MD_MN_MIRROR_UNOWNED; | |
| 3714 mutex_exit(&un->un_owner_mx); | |
| 3715 } | |
| 3716 kmem_free(kres, sizeof (md_mn_kresult_t)); | |
| 3717 } else | |
| 3718 mutex_exit(&un->un_owner_mx); | |
| 3719 | |
| 3720 /* | |
| 3721 * Re-enqueue this request on the deferred i/o list. Delay the | |
| 3722 * request for md_mirror_owner_to usecs to stop thrashing. | |
| 3723 */ | |
| 3724 (void) timeout(owner_timeout, dq, | |
| 3725 drv_usectohz(md_mirror_owner_to)); | |
| 3726 } | |
| 3727 } | |
| 3728 | |
| 3729 static void | |
| 3730 mirror_write_strategy(buf_t *pb, int flag, void *private) | |
| 3731 { | |
| 3732 md_mps_t *ps; | |
| 3733 md_mcs_t *cs; | |
| 3734 int more; | |
| 3735 mm_unit_t *un; | |
| 3736 mdi_unit_t *ui; | |
| 3737 buf_t *cb; /* child buf pointer */ | |
| 3738 set_t setno; | |
| 3739 int rs_on_overlap = 0; | |
| 3740 | |
| 3741 ui = MDI_UNIT(getminor(pb->b_edev)); | |
| 3742 un = (mm_unit_t *)MD_UNIT(getminor(pb->b_edev)); | |
| 3743 | |
| 3744 | |
| 3745 md_kstat_waitq_enter(ui); | |
| 3746 | |
| 3747 /* | |
| 3748 * If a state change is in progress for this mirror in a MN set, | |
| 3749 * suspend all non-resync writes until the state change is complete. | |
| 3750 * The objective of this suspend is to ensure that it is not | |
| 3751 * possible for one node to read data from a submirror that another node | |
| 3752 * has not written to because of the state change. Therefore we | |
| 3753 * suspend all writes until the state change has been made. As it is | |
| 3754 * not possible to read from the target of a resync, there is no need | |
| 3755 * to suspend resync writes. | |
| 3756 */ | |
| 3757 | |
| 3758 if (!(flag & MD_STR_WAR)) { | |
| 3759 mutex_enter(&un->un_suspend_wr_mx); | |
| 3760 while (un->un_suspend_wr_flag) { | |
| 3761 cv_wait(&un->un_suspend_wr_cv, &un->un_suspend_wr_mx); | |
| 3762 } | |
| 3763 mutex_exit(&un->un_suspend_wr_mx); | |
| 3764 (void) md_unit_readerlock(ui); | |
| 3765 } | |
| 3766 | |
| 3767 if (!(flag & MD_STR_NOTTOP)) { | |
| 3768 if (md_checkbuf(ui, (md_unit_t *)un, pb)) { | |
| 3769 md_kstat_waitq_exit(ui); | |
| 3770 return; | |
| 3771 } | |
| 3772 } | |
| 3773 | |
| 3774 setno = MD_MIN2SET(getminor(pb->b_edev)); | |
| 3775 | |
| 3776 /* If an ABR write has been requested, set MD_STR_ABR flag */ | |
| 3777 if (MD_MNSET_SETNO(setno) && (pb->b_flags & B_ABRWRITE)) | |
| 3778 flag |= MD_STR_ABR; | |
| 3779 | |
| 3780 if (private == NULL) { | |
| 3781 ps = kmem_cache_alloc(mirror_parent_cache, MD_ALLOCFLAGS); | |
| 3782 mirror_parent_init(ps); | |
| 3783 } else { | |
| 3784 ps = private; | |
| 3785 private = NULL; | |
| 3786 } | |
| 3787 if (flag & MD_STR_MAPPED) | |
| 3788 ps->ps_flags |= MD_MPS_MAPPED; | |
| 3789 | |
| 3790 if (flag & MD_STR_WOW) | |
| 3791 ps->ps_flags |= MD_MPS_WOW; | |
| 3792 | |
| 3793 if (flag & MD_STR_ABR) | |
| 3794 ps->ps_flags |= MD_MPS_ABR; | |
| 3795 | |
| 3796 if (flag & MD_STR_WMUPDATE) | |
| 3797 ps->ps_flags |= MD_MPS_WMUPDATE; | |
| 3798 | |
| 3799 /* | |
| 3800 * Save essential information from the original buffhdr | |
| 3801 * in the md_save structure. | |
| 3802 */ | |
| 3803 ps->ps_un = un; | |
| 3804 ps->ps_ui = ui; | |
| 3805 ps->ps_bp = pb; | |
| 3806 ps->ps_addr = pb->b_un.b_addr; | |
| 3807 ps->ps_firstblk = pb->b_lblkno; | |
| 3808 ps->ps_lastblk = pb->b_lblkno + lbtodb(pb->b_bcount) - 1; | |
| 3809 ps->ps_changecnt = un->un_changecnt; | |
| 3810 | |
| 3811 /* | |
| 3812 * If not MN owner and this is an ABR write, make sure the current | |
| 3813 * resync region is on the overlaps chain | |
| 3814 */ | |
| 3815 mutex_enter(&un->un_owner_mx); | |
| 3816 if (MD_MNSET_SETNO(setno) && (!(MD_MN_MIRROR_OWNER(un))) && | |
| 3817 ((ui->ui_tstate & MD_ABR_CAP) || (flag & MD_STR_ABR))) { | |
| 3818 md_mps_t *ps1; | |
| 3819 /* Block the current resync region, if not already blocked */ | |
| 3820 ps1 = un->un_rs_prev_ovrlap; | |
| 3821 | |
| 3822 if ((ps1 != NULL) && ((ps1->ps_firstblk != 0) || | |
| 3823 (ps1->ps_lastblk != 0))) { | |
| 3824 /* Drop locks to avoid deadlock */ | |
| 3825 mutex_exit(&un->un_owner_mx); | |
| 3826 md_unit_readerexit(ui); | |
| 3827 wait_for_overlaps(ps1, MD_OVERLAP_ALLOW_REPEAT); | |
| 3828 rs_on_overlap = 1; | |
| 3829 (void) md_unit_readerlock(ui); | |
| 3830 mutex_enter(&un->un_owner_mx); | |
| 3831 /* | |
| 3832 * Check to see if we have obtained ownership | |
| 3833 * while waiting for overlaps. If we have, remove | |
| 3834 * the resync_region entry from the overlap chain | |
| 3835 */ | |
| 3836 if (MD_MN_MIRROR_OWNER(un) && | |
| 3837 (ps1->ps_flags & MD_MPS_ON_OVERLAP)) { | |
| 3838 mirror_overlap_chain_remove(ps1); | |
| 3839 rs_on_overlap = 0; | |
| 3840 } | |
| 3841 } | |
| 3842 } | |
| 3843 mutex_exit(&un->un_owner_mx); | |
| 3844 | |
| 3845 | |
| 3846 /* | |
| 3847 * following keep write after read from writing to the | |
| 3848 * source in the case where it all came from one place | |
| 3849 */ | |
| 3850 if (flag & MD_STR_WAR) { | |
| 3851 int abort_write = 0; | |
| 3852 /* | |
| 3853 * We are perfoming a write-after-read. This is either as a | |
| 3854 * result of a resync read or as a result of a read in a | |
| 3855 * dirty resync region when the optimized resync is not | |
| 3856 * complete. If in a MN set and a resync generated i/o, | |
| 3857 * if the current block is not in the current | |
| 3858 * resync region terminate the write as another node must have | |
| 3859 * completed this resync region | |
| 3860 */ | |
| 3861 if ((MD_MNSET_SETNO(MD_UN2SET(un))) && | |
| 3862 (!flag & MD_STR_DIRTY_RD)) { | |
| 3863 if (!IN_RESYNC_REGION(un, ps)) | |
| 3864 abort_write = 1; | |
| 3865 } | |
| 3866 if ((select_write_after_read_units(un, ps) == 0) || | |
| 3867 (abort_write)) { | |
| 3868 #ifdef DEBUG | |
| 3869 if (mirror_debug_flag) | |
| 3870 printf("Abort resync write on %x, block %lld\n", | |
| 3871 MD_SID(un), ps->ps_firstblk); | |
| 3872 #endif | |
| 3873 if (ps->ps_flags & MD_MPS_ON_OVERLAP) | |
| 3874 mirror_overlap_chain_remove(ps); | |
| 3875 kmem_cache_free(mirror_parent_cache, ps); | |
| 3876 md_kstat_waitq_exit(ui); | |
| 3877 md_unit_readerexit(ui); | |
| 3878 md_biodone(pb); | |
| 3879 return; | |
| 3880 } | |
| 3881 } else { | |
| 3882 select_write_units(un, ps); | |
| 3883 | |
| 3884 /* Drop readerlock to avoid deadlock */ | |
| 3885 md_unit_readerexit(ui); | |
| 3886 wait_for_overlaps(ps, MD_OVERLAP_NO_REPEAT); | |
| 3887 un = md_unit_readerlock(ui); | |
| 3888 /* | |
| 3889 * For a MN set with an ABR write, if we are now the | |
| 3890 * owner and we have a resync region on the overlap | |
| 3891 * chain, remove the entry from overlaps and retry the write. | |
| 3892 */ | |
| 3893 | |
| 3894 if (MD_MNSET_SETNO(setno) && | |
| 3895 ((ui->ui_tstate & MD_ABR_CAP) || (flag & MD_STR_ABR))) { | |
| 3896 mutex_enter(&un->un_owner_mx); | |
| 3897 if (((MD_MN_MIRROR_OWNER(un))) && rs_on_overlap) { | |
| 3898 mirror_overlap_chain_remove(ps); | |
| 3899 md_kstat_waitq_exit(ui); | |
| 3900 mutex_exit(&un->un_owner_mx); | |
| 3901 md_unit_readerexit(ui); | |
| 3902 daemon_request(&md_mirror_daemon, daemon_io, | |
| 3903 (daemon_queue_t *)ps, REQ_OLD); | |
| 3904 return; | |
| 3905 } | |
| 3906 mutex_exit(&un->un_owner_mx); | |
| 3907 } | |
| 3908 } | |
| 3909 | |
| 3910 /* | |
| 3911 * For Multinode mirrors with a Resync Region (not ABR) we need to | |
| 3912 * become the mirror owner before continuing with the write(). For ABR | |
| 3913 * mirrors we check that we 'own' the resync if we're in | |
| 3914 * write-after-read mode. We do this _after_ ensuring that there are no | |
| 3915 * overlaps to ensure that the once we know that we are the owner, the | |
| 3916 * readerlock will not released until the write is complete. As a | |
| 3917 * change of ownership in a MN set requires the writerlock, this | |
| 3918 * ensures that ownership cannot be changed until the write is | |
| 3919 * complete | |
| 3920 */ | |
| 3921 if (MD_MNSET_SETNO(setno) && (!((ui->ui_tstate & MD_ABR_CAP) || | |
| 3922 (flag & MD_STR_ABR)) || (flag & MD_STR_WAR))) { | |
| 3923 if (!MD_MN_MIRROR_OWNER(un)) { | |
| 3924 if (ps->ps_flags & MD_MPS_ON_OVERLAP) | |
| 3925 mirror_overlap_chain_remove(ps); | |
| 3926 md_kstat_waitq_exit(ui); | |
| 3927 ASSERT(!(flag & MD_STR_WAR)); | |
| 3928 md_unit_readerexit(ui); | |
| 3929 daemon_request(&md_mirror_daemon, become_owner, | |
| 3930 (daemon_queue_t *)ps, REQ_OLD); | |
| 3931 return; | |
| 3932 } | |
| 3933 } | |
| 3934 | |
| 3935 /* | |
| 3936 * Mark resync region if mirror has a Resync Region _and_ we are not | |
| 3937 * a resync initiated write(). Don't mark region if we're flagged as | |
| 3938 * an ABR write. | |
| 3939 */ | |
| 3940 if (!((ui->ui_tstate & MD_ABR_CAP) || (flag & MD_STR_ABR)) && | |
| 3941 !(flag & MD_STR_WAR)) { | |
| 3942 if (mirror_mark_resync_region(un, ps->ps_firstblk, | |
| 3943 ps->ps_lastblk)) { | |
| 3944 pb->b_flags |= B_ERROR; | |
| 3945 pb->b_resid = pb->b_bcount; | |
| 3946 ASSERT(!(ps->ps_flags & MD_MPS_ON_OVERLAP)); | |
| 3947 kmem_cache_free(mirror_parent_cache, ps); | |
| 3948 md_kstat_waitq_exit(ui); | |
| 3949 md_unit_readerexit(ui); | |
| 3950 md_biodone(pb); | |
| 3951 return; | |
| 3952 } | |
| 3953 } | |
| 3954 | |
| 3955 ps->ps_childbflags = pb->b_flags | B_WRITE; | |
| 3956 ps->ps_childbflags &= ~B_READ; | |
| 3957 if (flag & MD_STR_MAPPED) | |
| 3958 ps->ps_childbflags &= ~B_PAGEIO; | |
| 3959 | |
| 3960 if (!(flag & MD_STR_NOTTOP) && panicstr) | |
| 3961 /* Disable WOW and don't free ps */ | |
| 3962 ps->ps_flags |= (MD_MPS_WOW|MD_MPS_DONTFREE); | |
| 3963 | |
| 3964 md_kstat_waitq_to_runq(ui); | |
| 3965 | |
| 3966 /* | |
| 3967 * Treat Raw and Direct I/O as Write-on-Write always | |
| 3968 */ | |
| 3969 | |
| 3970 if (!(md_mirror_wow_flg & WOW_DISABLE) && | |
| 3971 (md_mirror_wow_flg & WOW_PHYS_ENABLE) && | |
| 3972 (pb->b_flags & B_PHYS) && | |
| 3973 !(ps->ps_flags & MD_MPS_WOW)) { | |
| 3974 if (ps->ps_flags & MD_MPS_ON_OVERLAP) | |
| 3975 mirror_overlap_chain_remove(ps); | |
| 3976 md_unit_readerexit(ui); | |
| 3977 daemon_request(&md_mstr_daemon, handle_wow, | |
| 3978 (daemon_queue_t *)ps, REQ_OLD); | |
| 3979 return; | |
| 3980 } | |
| 3981 | |
| 3982 ps->ps_frags = 1; | |
| 3983 do { | |
| 3984 cs = kmem_cache_alloc(mirror_child_cache, MD_ALLOCFLAGS); | |
| 3985 mirror_child_init(cs); | |
| 3986 cb = &cs->cs_buf; | |
| 3987 more = mirror_map_write(un, cs, ps, (flag & MD_STR_WAR)); | |
| 3988 | |
| 3989 /* | |
| 3990 * This handles the case where we're requesting | |
| 3991 * a write to block 0 on a label partition. (more < 0) | |
| 3992 * means that the request size was smaller than the | |
| 3993 * size of the label. If so this request is done. | |
| 3994 */ | |
| 3995 if (more < 0) { | |
| 3996 if (ps->ps_flags & MD_MPS_ON_OVERLAP) | |
| 3997 mirror_overlap_chain_remove(ps); | |
| 3998 md_kstat_runq_exit(ui); | |
| 3999 kmem_cache_free(mirror_child_cache, cs); | |
| 4000 kmem_cache_free(mirror_parent_cache, ps); | |
| 4001 md_unit_readerexit(ui); | |
| 4002 md_biodone(pb); | |
| 4003 return; | |
| 4004 } | |
| 4005 if (more) { | |
| 4006 mutex_enter(&ps->ps_mx); | |
| 4007 ps->ps_frags++; | |
| 4008 mutex_exit(&ps->ps_mx); | |
| 4009 } | |
| 4010 md_call_strategy(cb, flag, private); | |
| 4011 } while (more); | |
| 4012 | |
| 4013 if (!(flag & MD_STR_NOTTOP) && panicstr) { | |
| 4014 while (!(ps->ps_flags & MD_MPS_DONE)) { | |
| 4015 md_daemon(1, &md_done_daemon); | |
| 4016 drv_usecwait(10); | |
| 4017 } | |
| 4018 kmem_cache_free(mirror_parent_cache, ps); | |
| 4019 } | |
| 4020 } | |
| 4021 | |
| 4022 static void | |
| 4023 mirror_read_strategy(buf_t *pb, int flag, void *private) | |
| 4024 { | |
| 4025 md_mps_t *ps; | |
| 4026 md_mcs_t *cs; | |
| 4027 size_t more; | |
| 4028 mm_unit_t *un; | |
| 4029 mdi_unit_t *ui; | |
| 4030 size_t current_count; | |
| 4031 diskaddr_t current_blkno; | |
| 4032 off_t current_offset; | |
| 4033 buf_t *cb; /* child buf pointer */ | |
| 4034 set_t setno; | |
| 4035 | |
| 4036 ui = MDI_UNIT(getminor(pb->b_edev)); | |
| 4037 | |
| 4038 md_kstat_waitq_enter(ui); | |
| 4039 | |
| 4040 un = (mm_unit_t *)md_unit_readerlock(ui); | |
| 4041 | |
| 4042 if (!(flag & MD_STR_NOTTOP)) { | |
| 4043 if (md_checkbuf(ui, (md_unit_t *)un, pb)) { | |
| 4044 md_kstat_waitq_exit(ui); | |
| 4045 return; | |
| 4046 } | |
| 4047 } | |
| 4048 | |
| 4049 if (private == NULL) { | |
| 4050 ps = kmem_cache_alloc(mirror_parent_cache, MD_ALLOCFLAGS); | |
| 4051 mirror_parent_init(ps); | |
| 4052 } else { | |
| 4053 ps = private; | |
| 4054 private = NULL; | |
| 4055 } | |
| 4056 | |
| 4057 if (flag & MD_STR_MAPPED) | |
| 4058 ps->ps_flags |= MD_MPS_MAPPED; | |
| 4059 if (flag & MD_NOBLOCK) | |
| 4060 ps->ps_flags |= MD_MPS_NOBLOCK; | |
| 4061 if (flag & MD_STR_WMUPDATE) | |
| 4062 ps->ps_flags |= MD_MPS_WMUPDATE; | |
| 4063 | |
| 4064 /* | |
| 4065 * Check to see if this is a DMR driven read. If so we need to use the | |
| 4066 * specified side (in un->un_dmr_last_read) for the source of the data. | |
| 4067 */ | |
| 4068 if (flag & MD_STR_DMR) | |
| 4069 ps->ps_flags |= MD_MPS_DMR; | |
| 4070 | |
| 4071 /* | |
| 4072 * Save essential information from the original buffhdr | |
| 4073 * in the md_save structure. | |
| 4074 */ | |
| 4075 ps->ps_un = un; | |
| 4076 ps->ps_ui = ui; | |
| 4077 ps->ps_bp = pb; | |
| 4078 ps->ps_addr = pb->b_un.b_addr; | |
| 4079 ps->ps_firstblk = pb->b_lblkno; | |
| 4080 ps->ps_lastblk = pb->b_lblkno + lbtodb(pb->b_bcount) - 1; | |
| 4081 ps->ps_changecnt = un->un_changecnt; | |
| 4082 | |
| 4083 current_count = btodb(pb->b_bcount); | |
| 4084 current_blkno = pb->b_lblkno; | |
| 4085 current_offset = 0; | |
| 4086 | |
| 4087 /* | |
| 4088 * If flag has MD_STR_WAR set this means that the read is issued by a | |
| 4089 * resync thread which may or may not be an optimised resync. | |
| 4090 * | |
| 4091 * If MD_UN_OPT_NOT_DONE is set this means that the optimized resync | |
| 4092 * code has not completed; either a resync has not started since snarf, | |
| 4093 * or there is an optimized resync in progress. | |
| 4094 * | |
| 4095 * We need to generate a write after this read in the following two | |
| 4096 * cases, | |
| 4097 * | |
| 4098 * 1. Any Resync-Generated read | |
| 4099 * | |
| 4100 * 2. Any read to a DIRTY REGION if there is an optimized resync | |
| 4101 * pending or in progress. | |
| 4102 * | |
| 4103 * The write after read is done in these cases to ensure that all sides | |
| 4104 * of the mirror are in sync with the read data and that it is not | |
| 4105 * possible for an application to read the same block multiple times | |
| 4106 * and get different data. | |
| 4107 * | |
| 4108 * This would be possible if the block was in a dirty region. | |
| 4109 * | |
| 4110 * If we're performing a directed read we don't write the data out as | |
| 4111 * the application is responsible for restoring the mirror to a known | |
| 4112 * state. | |
| 4113 */ | |
| 4114 if (((MD_STATUS(un) & MD_UN_OPT_NOT_DONE) || (flag & MD_STR_WAR)) && | |
| 4115 !(flag & MD_STR_DMR)) { | |
| 4116 size_t start_rr, i, end_rr; | |
| 4117 int region_dirty = 1; | |
| 4118 | |
| 4119 /* | |
| 4120 * We enter here under three circumstances, | |
| 4121 * | |
| 4122 * MD_UN_OPT_NOT_DONE MD_STR_WAR | |
| 4123 * 0 1 | |
| 4124 * 1 0 | |
| 4125 * 1 1 | |
| 4126 * | |
| 4127 * To be optimal we only care to explicitly check for dirty | |
| 4128 * regions in the second case since if MD_STR_WAR is set we | |
| 4129 * always do the write after read. | |
| 4130 */ | |
| 4131 if (!(flag & MD_STR_WAR)) { | |
| 4132 BLK_TO_RR(end_rr, ps->ps_lastblk, un); | |
| 4133 BLK_TO_RR(start_rr, ps->ps_firstblk, un); | |
| 4134 | |
| 4135 for (i = start_rr; i <= end_rr; i++) | |
| 4136 if ((region_dirty = IS_KEEPDIRTY(i, un)) != 0) | |
| 4137 break; | |
| 4138 } | |
| 4139 | |
| 4140 if ((region_dirty) && | |
| 4141 !(md_get_setstatus(MD_UN2SET(un)) & MD_SET_STALE)) { | |
| 4142 ps->ps_call = write_after_read; | |
| 4143 /* | |
| 4144 * Mark this as a RESYNC_READ in ps_flags. | |
| 4145 * This is used if the read fails during a | |
| 4146 * resync of a 3-way mirror to ensure that | |
| 4147 * the retried read to the remaining | |
| 4148 * good submirror has MD_STR_WAR set. This | |
| 4149 * is needed to ensure that the resync write | |
| 4150 * (write-after-read) takes place. | |
| 4151 */ | |
| 4152 ps->ps_flags |= MD_MPS_RESYNC_READ; | |
| 4153 | |
| 4154 /* | |
| 4155 * If MD_STR_FLAG_ERR is set in the flags we | |
| 4156 * set MD_MPS_FLAG_ERROR so that an error on the resync | |
| 4157 * write (issued by write_after_read) will be flagged | |
| 4158 * to the biowait'ing resync thread. This allows us to | |
| 4159 * avoid issuing further resync requests to a device | |
| 4160 * that has had a write failure. | |
| 4161 */ | |
| 4162 if (flag & MD_STR_FLAG_ERR) | |
| 4163 ps->ps_flags |= MD_MPS_FLAG_ERROR; | |
| 4164 | |
| 4165 setno = MD_UN2SET(un); | |
| 4166 /* | |
| 4167 * Drop the readerlock to avoid | |
| 4168 * deadlock | |
| 4169 */ | |
| 4170 md_unit_readerexit(ui); | |
| 4171 wait_for_overlaps(ps, MD_OVERLAP_NO_REPEAT); | |
| 4172 un = md_unit_readerlock(ui); | |
| 4173 /* | |
| 4174 * Ensure that we are owner | |
| 4175 */ | |
| 4176 if (MD_MNSET_SETNO(setno)) { | |
| 4177 /* | |
| 4178 * For a non-resync read that requires a | |
| 4179 * write-after-read to be done, set a flag | |
| 4180 * in the parent structure, so that the | |
| 4181 * write_strategy routine can omit the | |
| 4182 * test that the write is still within the | |
| 4183 * resync region | |
| 4184 */ | |
| 4185 if (!(flag & MD_STR_WAR)) | |
| 4186 ps->ps_flags |= MD_MPS_DIRTY_RD; | |
| 4187 | |
| 4188 /* | |
| 4189 * Before reading the buffer, see if | |
| 4190 * we are the owner | |
| 4191 */ | |
| 4192 if (!MD_MN_MIRROR_OWNER(un)) { | |
| 4193 ps->ps_call = NULL; | |
| 4194 mirror_overlap_chain_remove(ps); | |
| 4195 md_kstat_waitq_exit(ui); | |
| 4196 md_unit_readerexit(ui); | |
| 4197 daemon_request( | |
| 4198 &md_mirror_daemon, | |
| 4199 become_owner, | |
| 4200 (daemon_queue_t *)ps, | |
| 4201 REQ_OLD); | |
| 4202 return; | |
| 4203 } | |
| 4204 /* | |
| 4205 * For a resync read, check to see if I/O is | |
| 4206 * outside of the current resync region, or | |
| 4207 * the resync has finished. If so | |
| 4208 * just terminate the I/O | |
| 4209 */ | |
| 4210 if ((flag & MD_STR_WAR) && | |
| 4211 (!(un->c.un_status & MD_UN_WAR) || | |
| 4212 (!IN_RESYNC_REGION(un, ps)))) { | |
| 4213 #ifdef DEBUG | |
| 4214 if (mirror_debug_flag) | |
| 4215 printf("Abort resync read " | |
| 4216 "%x: %lld\n", | |
| 4217 MD_SID(un), | |
| 4218 ps->ps_firstblk); | |
| 4219 #endif | |
| 4220 mirror_overlap_chain_remove(ps); | |
| 4221 kmem_cache_free(mirror_parent_cache, | |
| 4222 ps); | |
| 4223 md_kstat_waitq_exit(ui); | |
| 4224 md_unit_readerexit(ui); | |
| 4225 md_biodone(pb); | |
| 4226 return; | |
| 4227 } | |
| 4228 } | |
| 4229 } | |
| 4230 } | |
| 4231 | |
| 4232 if (flag & MD_STR_DMR) { | |
| 4233 ps->ps_call = directed_read_done; | |
| 4234 } | |
| 4235 | |
| 4236 if (!(flag & MD_STR_NOTTOP) && panicstr) | |
| 4237 ps->ps_flags |= MD_MPS_DONTFREE; | |
| 4238 | |
| 4239 md_kstat_waitq_to_runq(ui); | |
| 4240 | |
| 4241 ps->ps_frags++; | |
| 4242 do { | |
| 4243 cs = kmem_cache_alloc(mirror_child_cache, MD_ALLOCFLAGS); | |
| 4244 mirror_child_init(cs); | |
| 4245 cb = &cs->cs_buf; | |
| 4246 cs->cs_ps = ps; | |
| 4247 | |
| 4248 cb = md_bioclone(pb, current_offset, current_count, NODEV, | |
| 4249 current_blkno, mirror_done, cb, KM_NOSLEEP); | |
| 4250 | |
| 4251 more = mirror_map_read(ps, cs, current_blkno, | |
| 4252 (u_longlong_t)current_count); | |
| 4253 if (more) { | |
| 4254 mutex_enter(&ps->ps_mx); | |
| 4255 ps->ps_frags++; | |
| 4256 mutex_exit(&ps->ps_mx); | |
| 4257 } | |
| 4258 | |
| 4259 /* | |
| 4260 * Do these calculations now, | |
| 4261 * so that we pickup a valid b_bcount from the chld_bp. | |
| 4262 */ | |
| 4263 current_count -= more; | |
| 4264 current_offset += cb->b_bcount; | |
| 4265 current_blkno += more; | |
| 4266 md_call_strategy(cb, flag, private); | |
| 4267 } while (more); | |
| 4268 | |
| 4269 if (!(flag & MD_STR_NOTTOP) && panicstr) { | |
| 4270 while (!(ps->ps_flags & MD_MPS_DONE)) { | |
| 4271 md_daemon(1, &md_done_daemon); | |
| 4272 drv_usecwait(10); | |
| 4273 } | |
| 4274 kmem_cache_free(mirror_parent_cache, ps); | |
| 4275 } | |
| 4276 } | |
| 4277 | |
| 4278 void | |
| 4279 md_mirror_strategy(buf_t *bp, int flag, void *private) | |
| 4280 { | |
| 4281 set_t setno = MD_MIN2SET(getminor(bp->b_edev)); | |
| 4282 | |
| 4283 /* | |
| 4284 * When doing IO to a multi owner meta device, check if set is halted. | |
| 4285 * We do this check without the needed lock held, for performance | |
| 4286 * reasons. | |
| 4287 * If an IO just slips through while the set is locked via an | |
| 4288 * MD_MN_SUSPEND_SET, we don't care about it. | |
| 4289 * Only check for suspension if we are a top-level i/o request | |
| 4290 * (MD_STR_NOTTOP is cleared in 'flag'). | |
| 4291 */ | |
| 4292 if ((md_set[setno].s_status & (MD_SET_HALTED | MD_SET_MNSET)) == | |
| 4293 (MD_SET_HALTED | MD_SET_MNSET)) { | |
| 4294 if ((flag & MD_STR_NOTTOP) == 0) { | |
| 4295 mutex_enter(&md_mx); | |
| 4296 /* Here we loop until the set is no longer halted */ | |
| 4297 while (md_set[setno].s_status & MD_SET_HALTED) { | |
| 4298 cv_wait(&md_cv, &md_mx); | |
| 4299 } | |
| 4300 mutex_exit(&md_mx); | |
| 4301 } | |
| 4302 } | |
| 4303 | |
| 4304 if ((flag & MD_IO_COUNTED) == 0) { | |
| 4305 if ((flag & MD_NOBLOCK) == 0) { | |
| 4306 if (md_inc_iocount(setno) != 0) { | |
| 4307 bp->b_flags |= B_ERROR; | |
| 4308 bp->b_error = ENXIO; | |
| 4309 bp->b_resid = bp->b_bcount; | |
| 4310 biodone(bp); | |
| 4311 return; | |
| 4312 } | |
| 4313 } else { | |
| 4314 md_inc_iocount_noblock(setno); | |
| 4315 } | |
| 4316 } | |
| 4317 | |
| 4318 if (bp->b_flags & B_READ) | |
| 4319 mirror_read_strategy(bp, flag, private); | |
| 4320 else | |
| 4321 mirror_write_strategy(bp, flag, private); | |
| 4322 } | |
| 4323 | |
| 4324 /* | |
| 4325 * mirror_directed_read: | |
| 4326 * -------------------- | |
| 4327 * Entry-point for the DKIOCDMR ioctl. We issue a read to a specified sub-mirror | |
| 4328 * so that the application can determine what (if any) resync needs to be | |
| 4329 * performed. The data is copied out to the user-supplied buffer. | |
| 4330 * | |
| 4331 * Parameters: | |
| 4332 * mdev - dev_t for the mirror device | |
| 4333 * vdr - directed read parameters specifying location and submirror | |
| 4334 * to perform the read from | |
| 4335 * mode - used to ddi_copyout() any resulting data from the read | |
| 4336 * | |
| 4337 * Returns: | |
| 4338 * 0 success | |
| 4339 * !0 error code | |
| 4340 * EINVAL - invalid request format | |
| 4341 */ | |
| 4342 int | |
| 4343 mirror_directed_read(dev_t mdev, vol_directed_rd_t *vdr, int mode) | |
| 4344 { | |
| 4345 buf_t *bp; | |
| 4346 minor_t mnum = getminor(mdev); | |
| 4347 mdi_unit_t *ui = MDI_UNIT(mnum); | |
| 4348 mm_unit_t *un; | |
| 4349 mm_submirror_t *sm; | |
| 4350 char *sm_nm; | |
| 4351 size_t namelen; | |
| 4352 uint_t next_side; | |
| 4353 void *kbuffer; | |
| 4354 | |
| 4355 if (ui == NULL) | |
| 4356 return (ENXIO); | |
| 4357 | |
| 4358 if (!(vdr->vdr_flags & DKV_DMR_NEXT_SIDE)) { | |
| 4359 return (EINVAL); | |
| 4360 } | |
| 4361 | |
| 4362 /* Check for aligned block access. We disallow non-aligned requests. */ | |
| 4363 if (vdr->vdr_offset % DEV_BSIZE) { | |
| 4364 return (EINVAL); | |
| 4365 } | |
| 4366 | |
| 4367 /* | |
| 4368 * Allocate kernel buffer for target of read(). If we had a reliable | |
| 4369 * (sorry functional) DDI this wouldn't be needed. | |
| 4370 */ | |
| 4371 kbuffer = kmem_alloc(vdr->vdr_nbytes, KM_NOSLEEP); | |
| 4372 if (kbuffer == NULL) { | |
| 4373 cmn_err(CE_WARN, "mirror_directed_read: couldn't allocate %lx" | |
| 4374 " bytes\n", vdr->vdr_nbytes); | |
| 4375 return (ENOMEM); | |
| 4376 } | |
| 4377 | |
| 4378 bp = getrbuf(KM_SLEEP); | |
| 4379 | |
| 4380 bp->b_un.b_addr = kbuffer; | |
| 4381 bp->b_flags = B_READ; | |
| 4382 bp->b_bcount = vdr->vdr_nbytes; | |
| 4383 bp->b_lblkno = lbtodb(vdr->vdr_offset); | |
| 4384 bp->b_edev = mdev; | |
| 4385 | |
| 4386 un = md_unit_readerlock(ui); | |
| 4387 | |
| 4388 /* | |
| 4389 * If DKV_SIDE_INIT is set we need to determine the first available | |
| 4390 * side to start reading from. If it isn't set we increment to the | |
| 4391 * next readable submirror. | |
| 4392 * If there are no readable submirrors we error out with DKV_DMR_ERROR. | |
| 4393 * Note: we check for a readable submirror on completion of the i/o so | |
| 4394 * we should _always_ have one available. If this becomes unavailable | |
| 4395 * we have missed the 'DKV_DMR_DONE' opportunity. This could happen if | |
| 4396 * a metadetach is made between the completion of one DKIOCDMR ioctl | |
| 4397 * and the start of the next (i.e. a sys-admin 'accident' occurred). | |
| 4398 * The chance of this is small, but not non-existent. | |
| 4399 */ | |
| 4400 if (vdr->vdr_side == DKV_SIDE_INIT) { | |
| 4401 next_side = 0; | |
| 4402 } else { | |
| 4403 next_side = vdr->vdr_side + 1; | |
| 4404 } | |
| 4405 while ((next_side < NMIRROR) && | |
| 4406 !SUBMIRROR_IS_READABLE(un, next_side)) | |
| 4407 next_side++; | |
| 4408 if (next_side >= NMIRROR) { | |
| 4409 vdr->vdr_flags |= DKV_DMR_ERROR; | |
| 4410 freerbuf(bp); | |
| 4411 vdr->vdr_bytesread = 0; | |
| 4412 md_unit_readerexit(ui); | |
| 4413 return (0); | |
| 4414 } | |
| 4415 | |
| 4416 /* Set the side to read from */ | |
| 4417 un->un_dmr_last_read = next_side; | |
| 4418 | |
| 4419 md_unit_readerexit(ui); | |
| 4420 | |
| 4421 /* | |
| 4422 * Save timestamp for verification purposes. Can be read by debugger | |
| 4423 * to verify that this ioctl has been executed and to find the number | |
| 4424 * of DMR reads and the time of the last DMR read. | |
| 4425 */ | |
| 4426 uniqtime(&mirror_dmr_stats.dmr_timestamp); | |
| 4427 mirror_dmr_stats.dmr_count++; | |
| 4428 | |
| 4429 /* Issue READ request and wait for completion */ | |
| 4430 mirror_read_strategy(bp, MD_STR_DMR|MD_NOBLOCK|MD_STR_NOTTOP, NULL); | |
| 4431 | |
| 4432 mutex_enter(&un->un_dmr_mx); | |
| 4433 cv_wait(&un->un_dmr_cv, &un->un_dmr_mx); | |
| 4434 mutex_exit(&un->un_dmr_mx); | |
| 4435 | |
| 4436 /* | |
| 4437 * Check to see if we encountered an error during the read. If so we | |
| 4438 * can make no guarantee about any possibly returned data. | |
| 4439 */ | |
| 4440 if ((bp->b_flags & B_ERROR) == 0) { | |
| 4441 vdr->vdr_flags &= ~DKV_DMR_ERROR; | |
| 4442 if (bp->b_resid) { | |
| 4443 vdr->vdr_flags |= DKV_DMR_SHORT; | |
| 4444 vdr->vdr_bytesread = vdr->vdr_nbytes - bp->b_resid; | |
| 4445 } else { | |
| 4446 vdr->vdr_flags |= DKV_DMR_SUCCESS; | |
| 4447 vdr->vdr_bytesread = vdr->vdr_nbytes; | |
| 4448 } | |
| 4449 /* Copy the data read back out to the user supplied buffer */ | |
| 4450 if (ddi_copyout(kbuffer, vdr->vdr_data, vdr->vdr_bytesread, | |
| 4451 mode)) { | |
| 4452 kmem_free(kbuffer, vdr->vdr_nbytes); | |
| 4453 return (EFAULT); | |
| 4454 } | |
| 4455 | |
| 4456 } else { | |
| 4457 /* Error out with DKV_DMR_ERROR */ | |
| 4458 vdr->vdr_flags |= DKV_DMR_ERROR; | |
| 4459 vdr->vdr_flags &= ~(DKV_DMR_SUCCESS|DKV_DMR_SHORT|DKV_DMR_DONE); | |
| 4460 } | |
| 4461 /* | |
| 4462 * Update the DMR parameters with the side and name of submirror that | |
| 4463 * we have just read from (un->un_dmr_last_read) | |
| 4464 */ | |
| 4465 un = md_unit_readerlock(ui); | |
| 4466 | |
| 4467 vdr->vdr_side = un->un_dmr_last_read; | |
| 4468 sm = &un->un_sm[un->un_dmr_last_read]; | |
| 4469 sm_nm = md_shortname(md_getminor(sm->sm_dev)); | |
| 4470 | |
| 4471 namelen = MIN(MD_MAX_SIDENAME_LEN, VOL_SIDENAME); | |
| 4472 (void) strncpy(vdr->vdr_side_name, sm_nm, namelen); | |
| 4473 | |
| 4474 /* | |
| 4475 * Determine if we've completed the read cycle. This is true iff the | |
| 4476 * next computed submirror (side) equals or exceeds NMIRROR. We cannot | |
| 4477 * use un_nsm as we need to handle a sparse array of submirrors (which | |
| 4478 * can occur if a submirror is metadetached). | |
| 4479 */ | |
| 4480 next_side = un->un_dmr_last_read + 1; | |
| 4481 while ((next_side < NMIRROR) && | |
| 4482 !SUBMIRROR_IS_READABLE(un, next_side)) | |
| 4483 next_side++; | |
| 4484 if (next_side >= NMIRROR) { | |
| 4485 /* We've finished */ | |
| 4486 vdr->vdr_flags |= DKV_DMR_DONE; | |
| 4487 } | |
| 4488 | |
| 4489 md_unit_readerexit(ui); | |
| 4490 freerbuf(bp); | |
| 4491 kmem_free(kbuffer, vdr->vdr_nbytes); | |
| 4492 | |
| 4493 return (0); | |
| 4494 } | |
| 4495 | |
| 4496 /* | |
| 4497 * mirror_resync_message: | |
| 4498 * --------------------- | |
| 4499 * Handle the multi-node resync messages that keep all nodes within a given | |
| 4500 * disk-set in sync with their view of a mirror's resync status. | |
| 4501 * | |
| 4502 * The message types dealt with are: | |
| 4503 * MD_MN_MSG_RESYNC_STARTING - start a resync thread for a unit | |
| 4504 * MD_MN_MSG_RESYNC_NEXT - specified next region to be resynced | |
| 4505 * MD_MN_MSG_RESYNC_FINISH - stop the resync thread for a unit | |
| 4506 * MD_MN_MSG_RESYNC_PHASE_DONE - end of a resync phase, opt, submirror or comp | |
| 4507 * | |
| 4508 * Returns: | |
| 4509 * 0 Success | |
| 4510 * >0 Failure error number | |
| 4511 */ | |
| 4512 int | |
| 4513 mirror_resync_message(md_mn_rs_params_t *p, IOLOCK *lockp) | |
| 4514 { | |
| 4515 mdi_unit_t *ui; | |
| 4516 mm_unit_t *un; | |
| 4517 set_t setno; | |
| 4518 int is_ABR; | |
| 4519 int smi; | |
| 4520 int ci; | |
| 4521 sm_state_t state; | |
| 4522 int broke_out; | |
| 4523 mm_submirror_t *sm; | |
| 4524 mm_submirror_ic_t *smic; | |
| 4525 md_m_shared_t *shared; | |
| 4526 md_error_t mde = mdnullerror; | |
| 4527 md_mps_t *ps; | |
| 4528 int rs_active; | |
| 4529 | |
| 4530 /* Check that the given device is part of a multi-node set */ | |
| 4531 setno = MD_MIN2SET(p->mnum); | |
| 4532 if (setno >= md_nsets) { | |
| 4533 return (ENXIO); | |
| 4534 } | |
| 4535 if (!MD_MNSET_SETNO(setno)) { | |
| 4536 return (EINVAL); | |
| 4537 } | |
| 4538 | |
| 4539 if ((un = mirror_getun(p->mnum, &p->mde, NO_LOCK, NULL)) == NULL) | |
| 4540 return (EINVAL); | |
| 4541 if ((ui = MDI_UNIT(p->mnum)) == NULL) | |
| 4542 return (EINVAL); | |
| 4543 is_ABR = (ui->ui_tstate & MD_ABR_CAP); | |
| 4544 | |
| 4545 /* Obtain the current resync status */ | |
| 4546 (void) md_ioctl_readerlock(lockp, ui); | |
| 4547 rs_active = (MD_STATUS(un) & MD_UN_RESYNC_ACTIVE) ? 1 : 0; | |
| 4548 md_ioctl_readerexit(lockp); | |
| 4549 | |
| 4550 switch ((md_mn_msgtype_t)p->msg_type) { | |
| 4551 case MD_MN_MSG_RESYNC_STARTING: | |
| 4552 /* Start the resync thread for the mirror */ | |
| 4553 (void) mirror_resync_unit(p->mnum, NULL, &p->mde, lockp); | |
| 4554 break; | |
| 4555 | |
| 4556 case MD_MN_MSG_RESYNC_NEXT: | |
| 4557 /* | |
| 4558 * We have to release any previously marked overlap regions | |
| 4559 * so that i/o can resume. Then we need to block the region | |
| 4560 * from [rs_start..rs_start+rs_size) * so that no i/o is issued. | |
| 4561 * Update un_rs_resync_done and un_rs_resync_2_do. | |
| 4562 */ | |
| 4563 (void) md_ioctl_readerlock(lockp, ui); | |
| 4564 /* | |
| 4565 * Ignore the message if there is no active resync thread or | |
| 4566 * if it is for a resync type that we have already completed. | |
| 4567 * un_resync_completed is set to the last resync completed | |
| 4568 * when processing a PHASE_DONE message. | |
| 4569 */ | |
| 4570 if (!rs_active || (p->rs_type == un->un_resync_completed)) | |
| 4571 break; | |
| 4572 /* | |
| 4573 * If this message is for the same resync and is for an earlier | |
| 4574 * resync region, just ignore it. This can only occur if this | |
| 4575 * node has progressed on to the next resync region before | |
| 4576 * we receive this message. This can occur if the class for | |
| 4577 * this message is busy and the originator has to retry thus | |
| 4578 * allowing this node to move onto the next resync_region. | |
| 4579 */ | |
| 4580 if ((p->rs_type == un->un_rs_type) && | |
| 4581 (p->rs_start < un->un_resync_startbl)) | |
| 4582 break; | |
| 4583 ps = un->un_rs_prev_ovrlap; | |
| 4584 | |
| 4585 /* Allocate previous overlap reference if needed */ | |
| 4586 if (ps == NULL) { | |
| 4587 ps = kmem_cache_alloc(mirror_parent_cache, | |
| 4588 MD_ALLOCFLAGS); | |
| 4589 ps->ps_un = un; | |
| 4590 ps->ps_ui = ui; | |
| 4591 ps->ps_firstblk = 0; | |
| 4592 ps->ps_lastblk = 0; | |
| 4593 ps->ps_flags = 0; | |
| 4594 md_ioctl_readerexit(lockp); | |
| 4595 (void) md_ioctl_writerlock(lockp, ui); | |
| 4596 un->un_rs_prev_ovrlap = ps; | |
| 4597 md_ioctl_writerexit(lockp); | |
| 4598 } else | |
| 4599 md_ioctl_readerexit(lockp); | |
| 4600 | |
| 4601 if (p->rs_originator != md_mn_mynode_id) { | |
| 4602 /* | |
| 4603 * On all but the originating node, first update | |
| 4604 * the resync state, then unblock the previous | |
| 4605 * region and block the next one. No need | |
| 4606 * to do this if the region is already blocked. | |
| 4607 * Update the submirror state and flags from the | |
| 4608 * originator. This keeps the cluster in sync with | |
| 4609 * regards to the resync status. | |
| 4610 */ | |
| 4611 | |
| 4612 (void) md_ioctl_writerlock(lockp, ui); | |
| 4613 un->un_rs_resync_done = p->rs_done; | |
| 4614 un->un_rs_resync_2_do = p->rs_2_do; | |
| 4615 un->un_rs_type = p->rs_type; | |
| 4616 un->un_resync_startbl = p->rs_start; | |
| 4617 md_ioctl_writerexit(lockp); | |
| 4618 /* | |
| 4619 * Use un_owner_mx to ensure that an ownership change | |
| 4620 * cannot happen at the same time as this message | |
| 4621 */ | |
| 4622 mutex_enter(&un->un_owner_mx); | |
| 4623 if (MD_MN_MIRROR_OWNER(un)) { | |
| 4624 ps->ps_firstblk = p->rs_start; | |
| 4625 ps->ps_lastblk = ps->ps_firstblk + | |
| 4626 p->rs_size - 1; | |
| 4627 } else { | |
| 4628 if ((ps->ps_firstblk != p->rs_start) || | |
| 4629 (ps->ps_lastblk != p->rs_start + | |
| 4630 p->rs_size - 1)) { | |
| 4631 /* Remove previous overlap range */ | |
| 4632 if (ps->ps_flags & MD_MPS_ON_OVERLAP) | |
| 4633 mirror_overlap_chain_remove(ps); | |
| 4634 | |
| 4635 ps->ps_firstblk = p->rs_start; | |
| 4636 ps->ps_lastblk = ps->ps_firstblk + | |
| 4637 p->rs_size - 1; | |
| 4638 | |
| 4639 mutex_exit(&un->un_owner_mx); | |
| 4640 /* Block this range from all i/o. */ | |
| 4641 if (ps->ps_firstblk != 0 || | |
| 4642 ps->ps_lastblk != 0) | |
| 4643 wait_for_overlaps(ps, | |
| 4644 MD_OVERLAP_ALLOW_REPEAT); | |
| 4645 mutex_enter(&un->un_owner_mx); | |
| 4646 /* | |
| 4647 * Check to see if we have obtained | |
| 4648 * ownership while waiting for | |
| 4649 * overlaps. If we have, remove | |
| 4650 * the resync_region entry from the | |
| 4651 * overlap chain | |
| 4652 */ | |
| 4653 if (MD_MN_MIRROR_OWNER(un) && | |
| 4654 (ps->ps_flags & MD_MPS_ON_OVERLAP)) | |
| 4655 mirror_overlap_chain_remove(ps); | |
| 4656 } | |
| 4657 } | |
| 4658 mutex_exit(&un->un_owner_mx); | |
| 4659 | |
| 4660 /* | |
| 4661 * If this is the first RESYNC_NEXT message (i.e. | |
| 4662 * MD_MN_RS_FIRST_RESYNC_NEXT set in p->rs_flags), | |
| 4663 * issue RESYNC_START NOTIFY event | |
| 4664 */ | |
| 4665 if (p->rs_flags & MD_MN_RS_FIRST_RESYNC_NEXT) { | |
| 4666 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_RESYNC_START, | |
| 4667 SVM_TAG_METADEVICE, MD_UN2SET(un), | |
| 4668 MD_SID(un)); | |
| 4669 } | |
| 4670 | |
| 4671 /* Ensure that our local resync thread is running */ | |
| 4672 if (un->un_rs_thread == NULL) { | |
| 4673 (void) mirror_resync_unit(p->mnum, NULL, | |
| 4674 &p->mde, lockp); | |
| 4675 } | |
| 4676 } | |
| 4677 break; | |
| 4678 case MD_MN_MSG_RESYNC_FINISH: | |
| 4679 /* | |
| 4680 * Complete the resync by stopping the resync thread. | |
| 4681 * Also release the previous overlap region field. | |
| 4682 * Update the resync_progress_thread by cv_signal'ing it so | |
| 4683 * that we mark the end of the resync as soon as possible. This | |
| 4684 * stops an unnecessary delay should be panic after resync | |
| 4685 * completion. | |
| 4686 */ | |
| 4687 #ifdef DEBUG | |
| 4688 if (!rs_active) { | |
| 4689 if (mirror_debug_flag) | |
| 4690 printf("RESYNC_FINISH (mnum = %x), " | |
| 4691 "Resync *NOT* active", | |
| 4692 p->mnum); | |
| 4693 } | |
| 4694 #endif | |
| 4695 | |
| 4696 if ((un->c.un_status & MD_UN_RESYNC_ACTIVE) && | |
| 4697 (p->rs_originator != md_mn_mynode_id)) { | |
| 4698 mutex_enter(&un->un_rs_thread_mx); | |
| 4699 un->c.un_status &= ~MD_UN_RESYNC_CANCEL; | |
| 4700 un->un_rs_thread_flags |= MD_RI_SHUTDOWN; | |
| 4701 un->un_rs_thread_flags &= | |
| 4702 ~(MD_RI_BLOCK|MD_RI_BLOCK_OWNER); | |
| 4703 cv_signal(&un->un_rs_thread_cv); | |
| 4704 mutex_exit(&un->un_rs_thread_mx); | |
| 4705 } | |
| 4706 if (is_ABR) { | |
| 4707 /* Resync finished, if ABR set owner to NULL */ | |
| 4708 mutex_enter(&un->un_owner_mx); | |
| 4709 un->un_mirror_owner = 0; | |
| 4710 mutex_exit(&un->un_owner_mx); | |
| 4711 } | |
| 4712 (void) md_ioctl_writerlock(lockp, ui); | |
| 4713 ps = un->un_rs_prev_ovrlap; | |
| 4714 if (ps != NULL) { | |
| 4715 /* Remove previous overlap range */ | |
| 4716 if (ps->ps_flags & MD_MPS_ON_OVERLAP) | |
| 4717 mirror_overlap_chain_remove(ps); | |
| 4718 /* | |
| 4719 * Release the overlap range reference | |
| 4720 */ | |
| 4721 un->un_rs_prev_ovrlap = NULL; | |
| 4722 kmem_cache_free(mirror_parent_cache, | |
| 4723 ps); | |
| 4724 } | |
| 4725 md_ioctl_writerexit(lockp); | |
| 4726 | |
| 4727 /* Mark the resync as complete in the metadb */ | |
| 4728 un->un_rs_resync_done = p->rs_done; | |
| 4729 un->un_rs_resync_2_do = p->rs_2_do; | |
| 4730 un->un_rs_type = p->rs_type; | |
| 4731 mutex_enter(&un->un_rs_progress_mx); | |
| 4732 cv_signal(&un->un_rs_progress_cv); | |
| 4733 mutex_exit(&un->un_rs_progress_mx); | |
| 4734 | |
| 4735 un = md_ioctl_writerlock(lockp, ui); | |
| 4736 un->c.un_status &= ~MD_UN_RESYNC_ACTIVE; | |
| 4737 /* Deal with any pending grow_unit */ | |
| 4738 if (un->c.un_status & MD_UN_GROW_PENDING) { | |
| 4739 if ((mirror_grow_unit(un, &mde) != 0) || | |
| 4740 (! mdismderror(&mde, MDE_GROW_DELAYED))) { | |
| 4741 un->c.un_status &= ~MD_UN_GROW_PENDING; | |
| 4742 } | |
| 4743 } | |
| 4744 md_ioctl_writerexit(lockp); | |
| 4745 break; | |
| 4746 | |
| 4747 case MD_MN_MSG_RESYNC_PHASE_DONE: | |
| 4748 /* | |
| 4749 * A phase of the resync, optimized. component or | |
| 4750 * submirror is complete. Update mirror status. | |
| 4751 * If the flag CLEAR_OPT_NOT_DONE is set, it means that the | |
| 4752 * mirror owner is peforming a resync. If we have just snarfed | |
| 4753 * this set, then we must clear any of the flags set at snarf | |
| 4754 * time by unit_setup_resync(). | |
| 4755 * Note that unit_setup_resync() sets up these flags to | |
| 4756 * indicate that an optimized resync is required. These flags | |
| 4757 * need to be reset because if we get here, the mirror owner | |
| 4758 * will have handled the optimized resync. | |
| 4759 * The flags that must be cleared are MD_UN_OPT_NOT_DONE and | |
| 4760 * MD_UN_WAR. In addition, for each submirror, | |
| 4761 * MD_SM_RESYNC_TARGET must be cleared and SMS_OFFLINE_RESYNC | |
| 4762 * set to SMS_OFFLINE. | |
| 4763 */ | |
| 4764 #ifdef DEBUG | |
| 4765 if (mirror_debug_flag) | |
| 4766 printf("phase done mess received from %d, mnum=%x," | |
| 4767 "type=%x, flags=%x\n", p->rs_originator, p->mnum, | |
| 4768 p->rs_type, p->rs_flags); | |
| 4769 #endif | |
| 4770 /* | |
| 4771 * Ignore the message if there is no active resync thread. | |
| 4772 */ | |
| 4773 if (!rs_active) | |
| 4774 break; | |
| 4775 | |
| 4776 broke_out = p->rs_flags & MD_MN_RS_ERR; | |
| 4777 switch (RS_TYPE(p->rs_type)) { | |
| 4778 case MD_RS_OPTIMIZED: | |
| 4779 un = md_ioctl_writerlock(lockp, ui); | |
| 4780 if (p->rs_flags & MD_MN_RS_CLEAR_OPT_NOT_DONE) { | |
| 4781 /* If we are originator, just clear rs_type */ | |
| 4782 if (p->rs_originator == md_mn_mynode_id) { | |
| 4783 SET_RS_TYPE_NONE(un->un_rs_type); | |
| 4784 md_ioctl_writerexit(lockp); | |
| 4785 break; | |
| 4786 } | |
| 4787 /* | |
| 4788 * If CLEAR_OPT_NOT_DONE is set, only clear the | |
| 4789 * flags if OPT_NOT_DONE is set *and* rs_type | |
| 4790 * is MD_RS_NONE. | |
| 4791 */ | |
| 4792 if ((un->c.un_status & MD_UN_OPT_NOT_DONE) && | |
| 4793 (RS_TYPE(un->un_rs_type) == MD_RS_NONE)) { | |
| 4794 /* No resync in progress */ | |
| 4795 un->c.un_status &= ~MD_UN_OPT_NOT_DONE; | |
| 4796 un->c.un_status &= ~MD_UN_WAR; | |
| 4797 } else { | |
| 4798 /* | |
| 4799 * We are in the middle of an | |
| 4800 * optimized resync and this message | |
| 4801 * should be ignored. | |
| 4802 */ | |
| 4803 md_ioctl_writerexit(lockp); | |
| 4804 break; | |
| 4805 } | |
| 4806 } else { | |
| 4807 /* | |
| 4808 * This is the end of an optimized resync, | |
| 4809 * clear the OPT_NOT_DONE and OFFLINE_SM flags | |
| 4810 */ | |
| 4811 | |
| 4812 un->c.un_status &= ~MD_UN_KEEP_DIRTY; | |
| 4813 if (!broke_out) | |
| 4814 un->c.un_status &= ~MD_UN_WAR; | |
| 4815 } | |
| 4816 | |
| 4817 /* | |
| 4818 * Set resync_completed to last resync type and then | |
| 4819 * clear resync_type to indicate no resync in progress | |
| 4820 */ | |
| 4821 un->un_resync_completed = un->un_rs_type; | |
| 4822 SET_RS_TYPE_NONE(un->un_rs_type); | |
| 4823 | |
| 4824 /* | |
| 4825 * If resync is as a result of a submirror ONLINE, | |
| 4826 * reset the submirror state to SMS_RUNNING if the | |
| 4827 * resync was ok else set back to SMS_OFFLINE. | |
| 4828 */ | |
| 4829 for (smi = 0; smi < NMIRROR; smi++) { | |
| 4830 un->un_sm[smi].sm_flags &= | |
| 4831 ~MD_SM_RESYNC_TARGET; | |
| 4832 if (SMS_BY_INDEX_IS(un, smi, | |
| 4833 SMS_OFFLINE_RESYNC)) { | |
| 4834 if (p->rs_flags & | |
| 4835 MD_MN_RS_CLEAR_OPT_NOT_DONE) { | |
| 4836 state = SMS_OFFLINE; | |
| 4837 } else { | |
| 4838 state = (broke_out ? | |
| 4839 SMS_OFFLINE : SMS_RUNNING); | |
| 4840 } | |
| 4841 mirror_set_sm_state( | |
| 4842 &un->un_sm[smi], | |
| 4843 &un->un_smic[smi], state, | |
| 4844 broke_out); | |
| 4845 mirror_commit(un, NO_SUBMIRRORS, | |
| 4846 0); | |
| 4847 } | |
| 4848 /* | |
| 4849 * If we still have an offline submirror, reset | |
| 4850 * the OFFLINE_SM flag in the mirror status | |
| 4851 */ | |
| 4852 if (SMS_BY_INDEX_IS(un, smi, | |
| 4853 SMS_OFFLINE)) | |
| 4854 un->c.un_status |= | |
| 4855 MD_UN_OFFLINE_SM; | |
| 4856 } | |
| 4857 md_ioctl_writerexit(lockp); | |
| 4858 break; | |
| 4859 case MD_RS_SUBMIRROR: | |
| 4860 un = md_ioctl_writerlock(lockp, ui); | |
| 4861 smi = RS_SMI(p->rs_type); | |
| 4862 sm = &un->un_sm[smi]; | |
| 4863 smic = &un->un_smic[smi]; | |
| 4864 /* Clear RESYNC target */ | |
| 4865 un->un_sm[smi].sm_flags &= ~MD_SM_RESYNC_TARGET; | |
| 4866 /* | |
| 4867 * Set resync_completed to last resync type and then | |
| 4868 * clear resync_type to indicate no resync in progress | |
| 4869 */ | |
| 4870 un->un_resync_completed = un->un_rs_type; | |
| 4871 SET_RS_TYPE_NONE(un->un_rs_type); | |
| 4872 /* | |
| 4873 * If the resync completed ok reset the submirror | |
| 4874 * state to SMS_RUNNING else reset it to SMS_ATTACHED | |
| 4875 */ | |
| 4876 state = (broke_out ? | |
| 4877 SMS_ATTACHED : SMS_RUNNING); | |
| 4878 mirror_set_sm_state(sm, smic, state, broke_out); | |
| 4879 un->c.un_status &= ~MD_UN_WAR; | |
| 4880 mirror_commit(un, SMI2BIT(smi), 0); | |
| 4881 md_ioctl_writerexit(lockp); | |
| 4882 break; | |
| 4883 case MD_RS_COMPONENT: | |
| 4884 un = md_ioctl_writerlock(lockp, ui); | |
| 4885 smi = RS_SMI(p->rs_type); | |
| 4886 ci = RS_CI(p->rs_type); | |
| 4887 sm = &un->un_sm[smi]; | |
| 4888 smic = &un->un_smic[smi]; | |
| 4889 shared = (md_m_shared_t *) | |
| 4890 (*(smic->sm_shared_by_indx)) | |
| 4891 (sm->sm_dev, sm, ci); | |
| 4892 un->c.un_status &= ~MD_UN_WAR; | |
| 4893 /* Clear RESYNC target */ | |
| 4894 un->un_sm[smi].sm_flags &= ~MD_SM_RESYNC_TARGET; | |
| 4895 /* | |
| 4896 * Set resync_completed to last resync type and then | |
| 4897 * clear resync_type to indicate no resync in progress | |
| 4898 */ | |
| 4899 un->un_resync_completed = un->un_rs_type; | |
| 4900 SET_RS_TYPE_NONE(un->un_rs_type); | |
| 4901 | |
| 4902 /* | |
| 4903 * If the resync completed ok, set the component state | |
| 4904 * to CS_OKAY. | |
| 4905 */ | |
| 4906 if (broke_out) | |
| 4907 shared->ms_flags |= MDM_S_RS_TRIED; | |
| 4908 else { | |
| 4909 /* | |
| 4910 * As we don't transmit the changes, | |
| 4911 * no need to drop the lock. | |
| 4912 */ | |
| 4913 set_sm_comp_state(un, smi, ci, CS_OKAY, 0, | |
| 4914 MD_STATE_NO_XMIT, (IOLOCK *)NULL); | |
| 4915 } | |
| 4916 md_ioctl_writerexit(lockp); | |
| 4917 default: | |
| 4918 break; | |
| 4919 } | |
| 4920 /* | |
| 4921 * If the purpose of this PHASE_DONE message is just to | |
| 4922 * indicate to all other nodes that the optimized resync | |
| 4923 * required (OPT_NOT_DONE) flag is to be cleared, there is | |
| 4924 * no need to generate a notify event as there has not | |
| 4925 * actually been a resync. | |
| 4926 */ | |
| 4927 if (!(p->rs_flags & MD_MN_RS_CLEAR_OPT_NOT_DONE)) { | |
| 4928 if (broke_out) { | |
| 4929 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_RESYNC_FAILED, | |
| 4930 SVM_TAG_METADEVICE, MD_UN2SET(un), | |
| 4931 MD_SID(un)); | |
| 4932 } else { | |
| 4933 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_RESYNC_DONE, | |
| 4934 SVM_TAG_METADEVICE, MD_UN2SET(un), | |
| 4935 MD_SID(un)); | |
| 4936 } | |
| 4937 } | |
| 4938 break; | |
| 4939 | |
| 4940 default: | |
| 4941 #ifdef DEBUG | |
| 4942 cmn_err(CE_PANIC, "mirror_resync_message: Unknown message type" | |
| 4943 " %x\n", p->msg_type); | |
| 4944 #endif | |
| 4945 return (EINVAL); | |
| 4946 } | |
| 4947 return (0); | |
| 4948 } | |
| 4949 | |
| 4950 /* Return a -1 if snarf of optimized record failed and set should be released */ | |
| 4951 static int | |
| 4952 mirror_snarf(md_snarfcmd_t cmd, set_t setno) | |
| 4953 { | |
| 4954 mddb_recid_t recid; | |
| 4955 int gotsomething; | |
| 4956 int all_mirrors_gotten; | |
| 4957 mm_unit_t *un; | |
| 4958 mddb_type_t typ1; | |
| 4959 mddb_de_ic_t *dep; | |
| 4960 mddb_rb32_t *rbp; | |
| 4961 size_t newreqsize; | |
| 4962 mm_unit_t *big_un; | |
| 4963 mm_unit32_od_t *small_un; | |
| 4964 int retval; | |
| 4965 mdi_unit_t *ui; | |
| 4966 | |
| 4967 if (cmd == MD_SNARF_CLEANUP) { | |
| 4968 if (md_get_setstatus(setno) & MD_SET_STALE) | |
| 4969 return (0); | |
| 4970 | |
| 4971 recid = mddb_makerecid(setno, 0); | |
| 4972 typ1 = (mddb_type_t)md_getshared_key(setno, | |
| 4973 mirror_md_ops.md_driver.md_drivername); | |
| 4974 while ((recid = mddb_getnextrec(recid, typ1, MIRROR_REC)) > 0) { | |
| 4975 if (mddb_getrecprivate(recid) & MD_PRV_CLEANUP) { | |
| 4976 un = (mm_unit_t *)mddb_getrecaddr(recid); | |
| 4977 mirror_cleanup(un); | |
| 4978 recid = mddb_makerecid(setno, 0); | |
| 4979 } | |
| 4980 } | |
| 4981 return (0); | |
| 4982 } | |
| 4983 | |
| 4984 all_mirrors_gotten = 1; | |
| 4985 gotsomething = 0; | |
| 4986 | |
| 4987 recid = mddb_makerecid(setno, 0); | |
| 4988 typ1 = (mddb_type_t)md_getshared_key(setno, | |
| 4989 mirror_md_ops.md_driver.md_drivername); | |
| 4990 | |
| 4991 while ((recid = mddb_getnextrec(recid, typ1, MIRROR_REC)) > 0) { | |
| 4992 if (mddb_getrecprivate(recid) & MD_PRV_GOTIT) | |
| 4993 continue; | |
| 4994 | |
| 4995 dep = mddb_getrecdep(recid); | |
| 4996 dep->de_flags = MDDB_F_MIRROR; | |
| 4997 rbp = dep->de_rb; | |
| 4998 | |
| 4999 if ((rbp->rb_revision == MDDB_REV_RB) && | |
| 5000 ((rbp->rb_private & MD_PRV_CONVD) == 0)) { | |
| 5001 /* | |
| 5002 * This means, we have an old and small record | |
| 5003 * and this record hasn't already been converted. | |
| 5004 * Before we create an incore metadevice from this | |
| 5005 * we have to convert it to a big record. | |
| 5006 */ | |
| 5007 small_un = (mm_unit32_od_t *)mddb_getrecaddr(recid); | |
| 5008 newreqsize = sizeof (mm_unit_t); | |
| 5009 big_un = (mm_unit_t *)kmem_zalloc(newreqsize, KM_SLEEP); | |
| 5010 mirror_convert((caddr_t)small_un, (caddr_t)big_un, | |
| 5011 SMALL_2_BIG); | |
| 5012 kmem_free(small_un, dep->de_reqsize); | |
| 5013 | |
| 5014 /* | |
| 5015 * Update userdata and incore userdata | |
| 5016 * incores are at the end of un | |
| 5017 */ | |
| 5018 dep->de_rb_userdata_ic = big_un; | |
| 5019 dep->de_rb_userdata = big_un; | |
| 5020 dep->de_icreqsize = newreqsize; | |
| 5021 un = big_un; | |
| 5022 rbp->rb_private |= MD_PRV_CONVD; | |
| 5023 } else { | |
| 5024 /* Big device */ | |
| 5025 un = (mm_unit_t *)mddb_getrecaddr_resize(recid, | |
| 5026 sizeof (*un), 0); | |
| 5027 } | |
| 5028 | |
| 5029 /* Set revision and flag accordingly */ | |
| 5030 if (rbp->rb_revision == MDDB_REV_RB) { | |
| 5031 un->c.un_revision = MD_32BIT_META_DEV; | |
| 5032 } else { | |
| 5033 un->c.un_revision = MD_64BIT_META_DEV; | |
| 5034 un->c.un_flag |= MD_EFILABEL; | |
| 5035 } | |
| 5036 | |
| 5037 /* | |
| 5038 * Create minor device node for snarfed entry. | |
| 5039 */ | |
| 5040 (void) md_create_minor_node(setno, MD_SID(un)); | |
| 5041 | |
| 5042 if (MD_UNIT(MD_SID(un)) != NULL) { | |
| 5043 mddb_setrecprivate(recid, MD_PRV_PENDDEL); | |
| 5044 continue; | |
| 5045 } | |
| 5046 all_mirrors_gotten = 0; | |
| 5047 retval = mirror_build_incore(un, 1); | |
| 5048 if (retval == 0) { | |
| 5049 mddb_setrecprivate(recid, MD_PRV_GOTIT); | |
| 5050 md_create_unit_incore(MD_SID(un), &mirror_md_ops, 0); | |
| 5051 resync_start_timeout(setno); | |
| 5052 gotsomething = 1; | |
| 5053 } else if (retval == -1) { | |
| 5054 return (-1); | |
| 5055 } | |
| 5056 /* | |
| 5057 * Set flag to indicate that the mirror has not yet | |
| 5058 * been through a reconfig. This flag is used for MN sets | |
| 5059 * when determining whether to update the mirror state from | |
| 5060 * the Master node. | |
| 5061 */ | |
| 5062 if (MD_MNSET_SETNO(setno)) { | |
| 5063 ui = MDI_UNIT(MD_SID(un)); | |
| 5064 ui->ui_tstate |= MD_RESYNC_NOT_DONE; | |
| 5065 } | |
| 5066 } | |
| 5067 | |
| 5068 if (!all_mirrors_gotten) | |
| 5069 return (gotsomething); | |
| 5070 | |
| 5071 recid = mddb_makerecid(setno, 0); | |
| 5072 while ((recid = mddb_getnextrec(recid, typ1, RESYNC_REC)) > 0) | |
| 5073 if (!(mddb_getrecprivate(recid) & MD_PRV_GOTIT)) | |
| 5074 mddb_setrecprivate(recid, MD_PRV_PENDDEL); | |
| 5075 | |
| 5076 return (0); | |
| 5077 } | |
| 5078 | |
| 5079 static int | |
| 5080 mirror_halt(md_haltcmd_t cmd, set_t setno) | |
| 5081 { | |
| 5082 unit_t i; | |
| 5083 mdi_unit_t *ui; | |
| 5084 minor_t mnum; | |
| 5085 int reset_mirror_flag = 0; | |
| 5086 | |
| 5087 if (cmd == MD_HALT_CLOSE) | |
| 5088 return (0); | |
| 5089 | |
| 5090 if (cmd == MD_HALT_OPEN) | |
| 5091 return (0); | |
| 5092 | |
| 5093 if (cmd == MD_HALT_UNLOAD) | |
| 5094 return (0); | |
| 5095 | |
| 5096 if (cmd == MD_HALT_CHECK) { | |
| 5097 for (i = 0; i < md_nunits; i++) { | |
| 5098 mnum = MD_MKMIN(setno, i); | |
| 5099 if ((ui = MDI_UNIT(mnum)) == NULL) | |
| 5100 continue; | |
| 5101 if (ui->ui_opsindex != mirror_md_ops.md_selfindex) | |
| 5102 continue; | |
| 5103 if (md_unit_isopen(ui)) | |
| 5104 return (1); | |
| 5105 } | |
| 5106 return (0); | |
| 5107 } | |
| 5108 | |
| 5109 if (cmd != MD_HALT_DOIT) | |
| 5110 return (1); | |
| 5111 | |
| 5112 for (i = 0; i < md_nunits; i++) { | |
| 5113 mnum = MD_MKMIN(setno, i); | |
| 5114 if ((ui = MDI_UNIT(mnum)) == NULL) | |
| 5115 continue; | |
| 5116 if (ui->ui_opsindex != mirror_md_ops.md_selfindex) | |
| 5117 continue; | |
| 5118 reset_mirror((mm_unit_t *)MD_UNIT(mnum), mnum, 0); | |
| 5119 | |
| 5120 /* Set a flag if there is at least one mirror metadevice. */ | |
| 5121 reset_mirror_flag = 1; | |
| 5122 } | |
| 5123 | |
| 5124 /* | |
| 5125 * Only wait for the global dr_timeout to finish | |
| 5126 * - if there are mirror metadevices in this diskset or | |
| 5127 * - if this is the local set since an unload of the md_mirror | |
| 5128 * driver could follow a successful mirror halt in the local set. | |
| 5129 */ | |
| 5130 if ((reset_mirror_flag != 0) || (setno == MD_LOCAL_SET)) { | |
| 5131 while ((mirror_md_ops.md_head == NULL) && | |
| 5132 (mirror_timeout.dr_timeout_id != 0)) | |
| 5133 delay(md_hz); | |
| 5134 } | |
| 5135 | |
| 5136 return (0); | |
| 5137 } | |
| 5138 | |
| 5139 /*ARGSUSED3*/ | |
| 5140 static int | |
| 5141 mirror_open(dev_t *dev, int flag, int otyp, cred_t *cred_p, int md_oflags) | |
| 5142 { | |
| 5143 IOLOCK lock; | |
|
46
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5144 minor_t mnum = getminor(*dev); |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5145 set_t setno; |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5146 |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5147 /* |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5148 * When doing an open of a multi owner metadevice, check to see if this |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5149 * node is a starting node and if a reconfig cycle is underway. |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5150 * If so, the system isn't sufficiently set up enough to handle the |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5151 * open (which involves I/O during sp_validate), so fail with ENXIO. |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5152 */ |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5153 setno = MD_MIN2SET(mnum); |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5154 if ((md_set[setno].s_status & (MD_SET_MNSET | MD_SET_MN_START_RC)) == |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5155 (MD_SET_MNSET | MD_SET_MN_START_RC)) { |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5156 return (ENXIO); |
|
042bf15ebd92
6274840 Cluster node(s) panic when I/O is starting on nodes during reconfig.
skamm
parents:
0
diff
changeset
|
5157 } |
| 0 | 5158 |
| 5159 if (md_oflags & MD_OFLG_FROMIOCTL) { | |
| 5160 /* | |
| 5161 * This indicates that the caller is an ioctl service routine. | |
| 5162 * In this case we initialise our stack-based IOLOCK and pass | |
| 5163 * this into the internal open routine. This allows multi-owner | |
| 5164 * metadevices to avoid deadlocking if an error is encountered | |
| 5165 * during the open() attempt. The failure case is: | |
| 5166 * s-p -> mirror -> s-p (with error). Attempting to metaclear | |
| 5167 * this configuration would deadlock as the mirror code has to | |
| 5168 * send a state-update to the other nodes when it detects the | |
| 5169 * failure of the underlying submirror with an errored soft-part | |
| 5170 * on it. As there is a class1 message in progress (metaclear) | |
| 5171 * set_sm_comp_state() cannot send another class1 message; | |
| 5172 * instead we do not send a state_update message as the | |
| 5173 * metaclear is distributed and the failed submirror will be | |
| 5174 * cleared from the configuration by the metaclear. | |
| 5175 */ | |
| 5176 IOLOCK_INIT(&lock); | |
| 5177 return (mirror_internal_open(getminor(*dev), flag, otyp, | |
| 5178 md_oflags, &lock)); | |
| 5179 } else { | |
| 5180 return (mirror_internal_open(getminor(*dev), flag, otyp, | |
| 5181 md_oflags, (IOLOCK *)NULL)); | |
| 5182 } | |
| 5183 } | |
| 5184 | |
| 5185 | |
| 5186 /*ARGSUSED1*/ | |
| 5187 static int | |
| 5188 mirror_close(dev_t dev, int flag, int otyp, cred_t *cred_p, int md_cflags) | |
| 5189 { | |
| 5190 return (mirror_internal_close(getminor(dev), otyp, md_cflags, | |
| 5191 (IOLOCK *)NULL)); | |
| 5192 } | |
| 5193 | |
| 5194 | |
| 5195 /* | |
| 5196 * This routine dumps memory to the disk. It assumes that the memory has | |
| 5197 * already been mapped into mainbus space. It is called at disk interrupt | |
| 5198 * priority when the system is in trouble. | |
| 5199 * | |
| 5200 */ | |
| 5201 static int | |
| 5202 mirror_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblk) | |
| 5203 { | |
| 5204 mm_unit_t *un; | |
| 5205 dev_t mapdev; | |
| 5206 int result; | |
| 5207 int smi; | |
| 5208 int any_succeed = 0; | |
| 5209 int save_result = 0; | |
| 5210 | |
| 5211 /* | |
| 5212 * Don't need to grab the unit lock. | |
| 5213 * Cause nothing else is suppose to be happenning. | |
| 5214 * Also dump is not suppose to sleep. | |
| 5215 */ | |
| 5216 un = (mm_unit_t *)MD_UNIT(getminor(dev)); | |
| 5217 | |
| 5218 if ((diskaddr_t)blkno >= un->c.un_total_blocks) | |
| 5219 return (EINVAL); | |
| 5220 | |
| 5221 if ((diskaddr_t)blkno + nblk > un->c.un_total_blocks) | |
| 5222 return (EINVAL); | |
| 5223 | |
| 5224 for (smi = 0; smi < NMIRROR; smi++) { | |
| 5225 if (!SUBMIRROR_IS_WRITEABLE(un, smi)) | |
| 5226 continue; | |
| 5227 mapdev = md_dev64_to_dev(un->un_sm[smi].sm_dev); | |
| 5228 result = bdev_dump(mapdev, addr, blkno, nblk); | |
| 5229 if (result) | |
| 5230 save_result = result; | |
| 5231 | |
| 5232 if (result == 0) | |
| 5233 any_succeed++; | |
| 5234 } | |
| 5235 | |
| 5236 if (any_succeed) | |
| 5237 return (0); | |
| 5238 | |
| 5239 return (save_result); | |
| 5240 } | |
| 5241 | |
| 5242 /* | |
| 5243 * NAME: mirror_probe_dev | |
| 5244 * | |
| 5245 * DESCRITPION: force opens every component of a mirror. | |
| 5246 * | |
| 5247 * On entry the unit writerlock is held | |
| 5248 */ | |
| 5249 static int | |
| 5250 mirror_probe_dev(mdi_unit_t *ui, minor_t mnum) | |
| 5251 { | |
| 5252 int i; | |
| 5253 int smi; | |
| 5254 int ci; | |
| 5255 mm_unit_t *un; | |
| 5256 int md_devopen = 0; | |
| 5257 set_t setno; | |
| 5258 int sm_cnt; | |
| 5259 int sm_unavail_cnt; | |
| 5260 | |
| 5261 if (md_unit_isopen(ui)) | |
| 5262 md_devopen++; | |
| 5263 | |
| 5264 un = MD_UNIT(mnum); | |
| 5265 setno = MD_UN2SET(un); | |
| 5266 | |
| 5267 sm_cnt = 0; | |
| 5268 sm_unavail_cnt = 0; | |
| 5269 for (i = 0; i < NMIRROR; i++) { | |
| 5270 md_dev64_t tmpdev; | |
| 5271 mdi_unit_t *sm_ui; | |
| 5272 | |
| 5273 if (!SMS_BY_INDEX_IS(un, i, SMS_INUSE)) { | |
| 5274 continue; | |
| 5275 } | |
| 5276 | |
| 5277 sm_cnt++; | |
| 5278 tmpdev = un->un_sm[i].sm_dev; | |
| 5279 (void) md_layered_open(mnum, &tmpdev, | |
| 5280 MD_OFLG_CONT_ERRS | MD_OFLG_PROBEDEV); | |
| 5281 un->un_sm[i].sm_dev = tmpdev; | |
| 5282 | |
| 5283 sm_ui = MDI_UNIT(getminor(md_dev64_to_dev(tmpdev))); | |
| 5284 | |
| 5285 /* | |
| 5286 * Logic similar to that in mirror_open_all_devs. We set or | |
| 5287 * clear the submirror Unavailable bit. | |
| 5288 */ | |
| 5289 (void) md_unit_writerlock(sm_ui); | |
| 5290 if (submirror_unavailable(un, i, 1)) { | |
| 5291 sm_ui->ui_tstate |= MD_INACCESSIBLE; | |
| 5292 sm_unavail_cnt++; | |
| 5293 } else { | |
| 5294 sm_ui->ui_tstate &= ~MD_INACCESSIBLE; | |
| 5295 } | |
| 5296 md_unit_writerexit(sm_ui); | |
| 5297 } | |
| 5298 | |
| 5299 /* | |
| 5300 * If all of the submirrors are unavailable, the mirror is also | |
| 5301 * unavailable. | |
| 5302 */ | |
| 5303 if (sm_cnt == sm_unavail_cnt) { | |
| 5304 ui->ui_tstate |= MD_INACCESSIBLE; | |
| 5305 } else { | |
| 5306 ui->ui_tstate &= ~MD_INACCESSIBLE; | |
| 5307 } | |
| 5308 | |
| 5309 /* | |
| 5310 * Start checking from probe failures. If failures occur we | |
| 5311 * set the appropriate erred state only if the metadevice is in | |
| 5312 * use. This is specifically to prevent unnecessary resyncs. | |
| 5313 * For instance if the disks were accidentally disconnected when | |
| 5314 * the system booted up then until the metadevice is accessed | |
| 5315 * (like file system mount) the user can shutdown, recable and | |
| 5316 * reboot w/o incurring a potentially huge resync. | |
| 5317 */ | |
| 5318 | |
| 5319 smi = 0; | |
| 5320 ci = 0; | |
| 5321 while (mirror_geterror(un, &smi, &ci, 1, 1) != 0) { | |
| 5322 | |
| 5323 if (mirror_other_sources(un, smi, ci, 0) == 1) { | |
| 5324 /* | |
| 5325 * Note that for a MN set, there is no need to call | |
| 5326 * SE_NOTIFY as that is done when processing the | |
| 5327 * state change | |
| 5328 */ | |
| 5329 if (md_devopen) { | |
| 5330 /* | |
| 5331 * Never called from ioctl context, | |
| 5332 * so (IOLOCK *)NULL | |
| 5333 */ | |
| 5334 set_sm_comp_state(un, smi, ci, CS_LAST_ERRED, | |
| 5335 0, MD_STATE_XMIT, (IOLOCK *)NULL); | |
| 5336 if (!MD_MNSET_SETNO(setno)) { | |
| 5337 SE_NOTIFY(EC_SVM_STATE, | |
| 5338 ESC_SVM_LASTERRED, | |
| 5339 SVM_TAG_METADEVICE, setno, | |
| 5340 MD_SID(un)); | |
| 5341 } | |
| 5342 continue; | |
| 5343 } else { | |
| 5344 (void) mirror_close_all_devs(un, | |
| 5345 MD_OFLG_PROBEDEV); | |
| 5346 if (!MD_MNSET_SETNO(setno)) { | |
| 5347 SE_NOTIFY(EC_SVM_STATE, | |
| 5348 ESC_SVM_OPEN_FAIL, | |
| 5349 SVM_TAG_METADEVICE, setno, | |
| 5350 MD_SID(un)); | |
| 5351 } | |
| 5352 mirror_openfail_console_info(un, smi, ci); | |
| 5353 return (ENXIO); | |
| 5354 } | |
| 5355 } | |
| 5356 | |
| 5357 /* | |
| 5358 * Note that for a MN set, there is no need to call | |
| 5359 * SE_NOTIFY as that is done when processing the | |
| 5360 * state change | |
| 5361 */ | |
| 5362 if (md_devopen) { | |
| 5363 /* Never called from ioctl context, so (IOLOCK *)NULL */ | |
| 5364 set_sm_comp_state(un, smi, ci, CS_ERRED, 0, | |
| 5365 MD_STATE_XMIT, (IOLOCK *)NULL); | |
| 5366 if (!MD_MNSET_SETNO(setno)) { | |
| 5367 SE_NOTIFY(EC_SVM_STATE, ESC_SVM_ERRED, | |
| 5368 SVM_TAG_METADEVICE, setno, | |
| 5369 MD_SID(un)); | |
| 5370 } | |
| 5371 } | |
| 5372 mirror_openfail_console_info(un, smi, ci); | |
| 5373 ci++; | |
| 5374 } | |
| 5375 | |
| 5376 if (MD_MNSET_SETNO(setno)) { | |
| 5377 send_poke_hotspares(setno); | |
| 5378 } else { | |
| 5379 (void) poke_hotspares(); | |
| 5380 } | |
| 5381 (void) mirror_close_all_devs(un, MD_OFLG_PROBEDEV); | |
| 5382 | |
| 5383 return (0); | |
| 5384 } | |
| 5385 | |
| 5386 | |
| 5387 static int | |
| 5388 mirror_imp_set( | |
| 5389 set_t setno | |
| 5390 ) | |
| 5391 { | |
| 5392 | |
| 5393 mddb_recid_t recid; | |
| 5394 int gotsomething, i; | |
| 5395 mddb_type_t typ1; | |
| 5396 mddb_de_ic_t *dep; | |
| 5397 mddb_rb32_t *rbp; | |
| 5398 mm_unit32_od_t *un32; | |
| 5399 mm_unit_t *un64; | |
| 5400 minor_t *self_id; /* minor needs to be updated */ | |
| 5401 md_parent_t *parent_id; /* parent needs to be updated */ | |
| 5402 mddb_recid_t *record_id; /* record id needs to be updated */ | |
| 5403 mddb_recid_t *optrec_id; | |
| 5404 md_dev64_t tmpdev; | |
| 5405 | |
| 5406 | |
| 5407 gotsomething = 0; | |
| 5408 | |
| 5409 typ1 = (mddb_type_t)md_getshared_key(setno, | |
| 5410 mirror_md_ops.md_driver.md_drivername); | |
| 5411 recid = mddb_makerecid(setno, 0); | |
| 5412 | |
| 5413 while ((recid = mddb_getnextrec(recid, typ1, MIRROR_REC)) > 0) { | |
| 5414 if (mddb_getrecprivate(recid) & MD_PRV_GOTIT) | |
| 5415 continue; | |
| 5416 | |
| 5417 dep = mddb_getrecdep(recid); | |
| 5418 rbp = dep->de_rb; | |
| 5419 | |
| 5420 if (rbp->rb_revision == MDDB_REV_RB) { | |
| 5421 /* | |
| 5422 * Small device | |
| 5423 */ | |
| 5424 un32 = (mm_unit32_od_t *)mddb_getrecaddr(recid); | |
| 5425 self_id = &(un32->c.un_self_id); | |
| 5426 parent_id = &(un32->c.un_parent); | |
| 5427 record_id = &(un32->c.un_record_id); | |
| 5428 optrec_id = &(un32->un_rr_dirty_recid); | |
| 5429 | |
| 5430 for (i = 0; i < un32->un_nsm; i++) { | |
| 5431 tmpdev = md_expldev(un32->un_sm[i].sm_dev); | |
| 5432 un32->un_sm[i].sm_dev = md_cmpldev | |
| 5433 (md_makedevice(md_major, MD_MKMIN(setno, | |
| 5434 MD_MIN2UNIT(md_getminor(tmpdev))))); | |
| 5435 | |
| 5436 if (!md_update_minor(setno, mddb_getsidenum | |
| 5437 (setno), un32->un_sm[i].sm_key)) | |
| 5438 goto out; | |
| 5439 } | |
| 5440 } else { | |
| 5441 un64 = (mm_unit_t *)mddb_getrecaddr(recid); | |
| 5442 self_id = &(un64->c.un_self_id); | |
| 5443 parent_id = &(un64->c.un_parent); | |
| 5444 record_id = &(un64->c.un_record_id); | |
| 5445 optrec_id = &(un64->un_rr_dirty_recid); | |
| 5446 | |
| 5447 for (i = 0; i < un64->un_nsm; i++) { | |
| 5448 tmpdev = un64->un_sm[i].sm_dev; | |
| 5449 un64->un_sm[i].sm_dev = md_makedevice | |
| 5450 (md_major, MD_MKMIN(setno, MD_MIN2UNIT | |
| 5451 (md_getminor(tmpdev)))); | |
| 5452 | |
| 5453 if (!md_update_minor(setno, mddb_getsidenum | |
| 5454 (setno), un64->un_sm[i].sm_key)) | |
| 5455 goto out; | |
| 5456 } | |
| 5457 } | |
| 5458 | |
| 5459 /* | |
| 5460 * Update unit with the imported setno | |
| 5461 * | |
| 5462 */ | |
| 5463 mddb_setrecprivate(recid, MD_PRV_GOTIT); | |
| 5464 | |
| 5465 *self_id = MD_MKMIN(setno, MD_MIN2UNIT(*self_id)); | |
| 5466 if (*parent_id != MD_NO_PARENT) | |
| 5467 *parent_id = MD_MKMIN(setno, MD_MIN2UNIT(*parent_id)); | |
| 5468 *record_id = MAKERECID(setno, DBID(*record_id)); | |
| 5469 *optrec_id = MAKERECID(setno, DBID(*optrec_id)); | |
| 5470 | |
| 5471 gotsomething = 1; | |
| 5472 } | |
| 5473 | |
| 5474 out: | |
| 5475 return (gotsomething); | |
| 5476 } | |
| 5477 | |
| 5478 /* | |
| 5479 * NAME: mirror_check_offline | |
| 5480 * | |
| 5481 * DESCRIPTION: return offline_status = 1 if any submirrors are offline | |
| 5482 * | |
| 5483 * Called from ioctl, so access to MD_UN_OFFLINE_SM in un_status is | |
| 5484 * protected by the global ioctl lock as it is only set by the MD_IOCOFFLINE | |
| 5485 * ioctl. | |
| 5486 */ | |
| 5487 int | |
| 5488 mirror_check_offline(md_dev64_t dev, int *offline_status) | |
| 5489 { | |
| 5490 mm_unit_t *un; | |
| 5491 md_error_t mde = mdnullerror; | |
| 5492 | |
| 5493 if ((un = mirror_getun(getminor(dev), &mde, NO_LOCK, NULL)) == NULL) | |
| 5494 return (EINVAL); | |
| 5495 *offline_status = 0; | |
| 5496 if (un->c.un_status & MD_UN_OFFLINE_SM) | |
| 5497 *offline_status = 1; | |
| 5498 return (0); | |
| 5499 } | |
| 5500 | |
| 5501 /* | |
| 5502 * NAME: mirror_inc_abr_count | |
| 5503 * | |
| 5504 * DESCRIPTION: increment the count of layered soft parts with ABR set | |
| 5505 * | |
| 5506 * Called from ioctl, so access to un_abr_count is protected by the global | |
| 5507 * ioctl lock. It is only referenced in the MD_IOCOFFLINE ioctl. | |
| 5508 */ | |
| 5509 int | |
| 5510 mirror_inc_abr_count(md_dev64_t dev) | |
| 5511 { | |
| 5512 mm_unit_t *un; | |
| 5513 md_error_t mde = mdnullerror; | |
| 5514 | |
| 5515 if ((un = mirror_getun(getminor(dev), &mde, NO_LOCK, NULL)) == NULL) | |
| 5516 return (EINVAL); | |
| 5517 un->un_abr_count++; | |
| 5518 return (0); | |
| 5519 } | |
| 5520 | |
| 5521 /* | |
| 5522 * NAME: mirror_dec_abr_count | |
| 5523 * | |
| 5524 * DESCRIPTION: decrement the count of layered soft parts with ABR set | |
| 5525 * | |
| 5526 * Called from ioctl, so access to un_abr_count is protected by the global | |
| 5527 * ioctl lock. It is only referenced in the MD_IOCOFFLINE ioctl. | |
| 5528 */ | |
| 5529 int | |
| 5530 mirror_dec_abr_count(md_dev64_t dev) | |
| 5531 { | |
| 5532 mm_unit_t *un; | |
| 5533 md_error_t mde = mdnullerror; | |
| 5534 | |
| 5535 if ((un = mirror_getun(getminor(dev), &mde, NO_LOCK, NULL)) == NULL) | |
| 5536 return (EINVAL); | |
| 5537 un->un_abr_count--; | |
| 5538 return (0); | |
| 5539 } | |
| 5540 | |
| 5541 static md_named_services_t mirror_named_services[] = { | |
| 5542 {(intptr_t (*)()) poke_hotspares, "poke hotspares" }, | |
| 5543 {(intptr_t (*)()) mirror_rename_listkids, MDRNM_LIST_URKIDS }, | |
| 5544 {mirror_rename_check, MDRNM_CHECK }, | |
| 5545 {(intptr_t (*)()) mirror_renexch_update_kids, MDRNM_UPDATE_KIDS }, | |
| 5546 {(intptr_t (*)()) mirror_exchange_parent_update_to, | |
| 5547 MDRNM_PARENT_UPDATE_TO}, | |
| 5548 {(intptr_t (*)()) mirror_exchange_self_update_from_down, | |
| 5549 MDRNM_SELF_UPDATE_FROM_DOWN }, | |
| 5550 {(intptr_t (*)())mirror_probe_dev, "probe open test" }, | |
| 5551 {(intptr_t (*)())mirror_check_offline, MD_CHECK_OFFLINE }, | |
| 5552 {(intptr_t (*)())mirror_inc_abr_count, MD_INC_ABR_COUNT }, | |
| 5553 {(intptr_t (*)())mirror_dec_abr_count, MD_DEC_ABR_COUNT }, | |
| 5554 { NULL, 0 } | |
| 5555 }; | |
| 5556 | |
| 5557 md_ops_t mirror_md_ops = { | |
| 5558 mirror_open, /* open */ | |
| 5559 mirror_close, /* close */ | |
| 5560 md_mirror_strategy, /* strategy */ | |
| 5561 NULL, /* print */ | |
| 5562 mirror_dump, /* dump */ | |
| 5563 NULL, /* read */ | |
| 5564 NULL, /* write */ | |
| 5565 md_mirror_ioctl, /* mirror_ioctl, */ | |
| 5566 mirror_snarf, /* mirror_snarf */ | |
| 5567 mirror_halt, /* mirror_halt */ | |
| 5568 NULL, /* aread */ | |
| 5569 NULL, /* awrite */ | |
| 5570 mirror_imp_set, /* import set */ | |
| 5571 mirror_named_services | |
| 5572 }; | |
| 5573 | |
| 5574 /* module specific initilization */ | |
| 5575 static void | |
| 5576 init_init() | |
| 5577 { | |
| 5578 md_mirror_mcs_buf_off = sizeof (md_mcs_t) - sizeof (buf_t); | |
| 5579 | |
| 5580 /* Initialize the parent and child save memory pools */ | |
| 5581 mirror_parent_cache = kmem_cache_create("md_mirror_parent", | |
| 5582 sizeof (md_mps_t), 0, mirror_parent_constructor, | |
| 5583 mirror_parent_destructor, mirror_run_queue, NULL, NULL, | |
| 5584 0); | |
| 5585 | |
| 5586 mirror_child_cache = kmem_cache_create("md_mirror_child", | |
| 5587 sizeof (md_mcs_t) - sizeof (buf_t) + biosize(), 0, | |
| 5588 mirror_child_constructor, mirror_child_destructor, | |
| 5589 mirror_run_queue, NULL, NULL, 0); | |
| 5590 | |
| 5591 /* | |
| 5592 * Insure wowbuf_size is a multiple of DEV_BSIZE, | |
| 5593 * then initialize wowbuf memory pool. | |
| 5594 */ | |
| 5595 md_wowbuf_size = roundup(md_wowbuf_size, DEV_BSIZE); | |
| 5596 if (md_wowbuf_size <= 0) | |
| 5597 md_wowbuf_size = 2 * DEV_BSIZE; | |
| 5598 if (md_wowbuf_size > (32 * DEV_BSIZE)) | |
| 5599 md_wowbuf_size = (32 * DEV_BSIZE); | |
| 5600 | |
| 5601 md_wowblk_size = md_wowbuf_size + sizeof (wowhdr_t); | |
| 5602 mirror_wowblk_cache = kmem_cache_create("md_mirror_wow", | |
| 5603 md_wowblk_size, 0, NULL, NULL, NULL, NULL, NULL, 0); | |
| 5604 | |
| 5605 mutex_init(&mirror_timeout.dr_mx, NULL, MUTEX_DEFAULT, NULL); | |
| 5606 mutex_init(&hotspare_request.dr_mx, NULL, MUTEX_DEFAULT, NULL); | |
| 5607 | |
| 5608 mutex_init(&non_ff_drv_mutex, NULL, MUTEX_DEFAULT, NULL); | |
| 5609 } | |
| 5610 | |
| 5611 /* module specific uninitilization (undo init_init()) */ | |
| 5612 static void | |
| 5613 fini_uninit() | |
| 5614 { | |
| 5615 kmem_cache_destroy(mirror_parent_cache); | |
| 5616 kmem_cache_destroy(mirror_child_cache); | |
| 5617 kmem_cache_destroy(mirror_wowblk_cache); | |
| 5618 mirror_parent_cache = mirror_child_cache = | |
| 5619 mirror_wowblk_cache = NULL; | |
| 5620 | |
| 5621 mutex_destroy(&mirror_timeout.dr_mx); | |
| 5622 mutex_destroy(&hotspare_request.dr_mx); | |
| 5623 mutex_destroy(&non_ff_drv_mutex); | |
| 5624 } | |
| 5625 | |
| 5626 /* define the module linkage */ | |
| 5627 MD_PLUGIN_MISC_MODULE("mirrors module %I%", init_init(), fini_uninit()) |