1 /*-
2 * Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/10.4/sys/geom/raid/tr_raid1e.c 261455 2014-02-04 03:36:42Z eadler $");
29
30 #include <sys/param.h>
31 #include <sys/bio.h>
32 #include <sys/endian.h>
33 #include <sys/kernel.h>
34 #include <sys/kobj.h>
35 #include <sys/limits.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/mutex.h>
39 #include <sys/sysctl.h>
40 #include <sys/systm.h>
41 #include <geom/geom.h>
42 #include "geom/raid/g_raid.h"
43 #include "g_raid_tr_if.h"
44
45 #define N 2
46
47 SYSCTL_DECL(_kern_geom_raid_raid1e);
48
49 #define RAID1E_REBUILD_SLAB (1 << 20) /* One transation in a rebuild */
50 static int g_raid1e_rebuild_slab = RAID1E_REBUILD_SLAB;
51 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_slab_size",
52 &g_raid1e_rebuild_slab);
53 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_slab_size, CTLFLAG_RW,
54 &g_raid1e_rebuild_slab, 0,
55 "Amount of the disk to rebuild each read/write cycle of the rebuild.");
56
57 #define RAID1E_REBUILD_FAIR_IO 20 /* use 1/x of the available I/O */
58 static int g_raid1e_rebuild_fair_io = RAID1E_REBUILD_FAIR_IO;
59 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_fair_io",
60 &g_raid1e_rebuild_fair_io);
61 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_fair_io, CTLFLAG_RW,
62 &g_raid1e_rebuild_fair_io, 0,
63 "Fraction of the I/O bandwidth to use when disk busy for rebuild.");
64
65 #define RAID1E_REBUILD_CLUSTER_IDLE 100
66 static int g_raid1e_rebuild_cluster_idle = RAID1E_REBUILD_CLUSTER_IDLE;
67 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_cluster_idle",
68 &g_raid1e_rebuild_cluster_idle);
69 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_cluster_idle, CTLFLAG_RW,
70 &g_raid1e_rebuild_cluster_idle, 0,
71 "Number of slabs to do each time we trigger a rebuild cycle");
72
73 #define RAID1E_REBUILD_META_UPDATE 1024 /* update meta data every 1GB or so */
74 static int g_raid1e_rebuild_meta_update = RAID1E_REBUILD_META_UPDATE;
75 TUNABLE_INT("kern.geom.raid.raid1e.rebuild_meta_update",
76 &g_raid1e_rebuild_meta_update);
77 SYSCTL_UINT(_kern_geom_raid_raid1e, OID_AUTO, rebuild_meta_update, CTLFLAG_RW,
78 &g_raid1e_rebuild_meta_update, 0,
79 "When to update the meta data.");
80
81 static MALLOC_DEFINE(M_TR_RAID1E, "tr_raid1e_data", "GEOM_RAID RAID1E data");
82
83 #define TR_RAID1E_NONE 0
84 #define TR_RAID1E_REBUILD 1
85 #define TR_RAID1E_RESYNC 2
86
87 #define TR_RAID1E_F_DOING_SOME 0x1
88 #define TR_RAID1E_F_LOCKED 0x2
89 #define TR_RAID1E_F_ABORT 0x4
90
91 struct g_raid_tr_raid1e_object {
92 struct g_raid_tr_object trso_base;
93 int trso_starting;
94 int trso_stopping;
95 int trso_type;
96 int trso_recover_slabs; /* slabs before rest */
97 int trso_fair_io;
98 int trso_meta_update;
99 int trso_flags;
100 struct g_raid_subdisk *trso_failed_sd; /* like per volume */
101 void *trso_buffer; /* Buffer space */
102 off_t trso_lock_pos; /* Locked range start. */
103 off_t trso_lock_len; /* Locked range length. */
104 struct bio trso_bio;
105 };
106
107 static g_raid_tr_taste_t g_raid_tr_taste_raid1e;
108 static g_raid_tr_event_t g_raid_tr_event_raid1e;
109 static g_raid_tr_start_t g_raid_tr_start_raid1e;
110 static g_raid_tr_stop_t g_raid_tr_stop_raid1e;
111 static g_raid_tr_iostart_t g_raid_tr_iostart_raid1e;
112 static g_raid_tr_iodone_t g_raid_tr_iodone_raid1e;
113 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid1e;
114 static g_raid_tr_locked_t g_raid_tr_locked_raid1e;
115 static g_raid_tr_idle_t g_raid_tr_idle_raid1e;
116 static g_raid_tr_free_t g_raid_tr_free_raid1e;
117
118 static kobj_method_t g_raid_tr_raid1e_methods[] = {
119 KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid1e),
120 KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid1e),
121 KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid1e),
122 KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid1e),
123 KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid1e),
124 KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid1e),
125 KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid1e),
126 KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid1e),
127 KOBJMETHOD(g_raid_tr_idle, g_raid_tr_idle_raid1e),
128 KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid1e),
129 { 0, 0 }
130 };
131
132 static struct g_raid_tr_class g_raid_tr_raid1e_class = {
133 "RAID1E",
134 g_raid_tr_raid1e_methods,
135 sizeof(struct g_raid_tr_raid1e_object),
136 .trc_enable = 1,
137 .trc_priority = 200,
138 .trc_accept_unmapped = 1
139 };
140
141 static void g_raid_tr_raid1e_rebuild_abort(struct g_raid_tr_object *tr);
142 static void g_raid_tr_raid1e_maybe_rebuild(struct g_raid_tr_object *tr,
143 struct g_raid_subdisk *sd);
144 static int g_raid_tr_raid1e_select_read_disk(struct g_raid_volume *vol,
145 int no, off_t off, off_t len, u_int mask);
146
147 static inline void
148 V2P(struct g_raid_volume *vol, off_t virt,
149 int *disk, off_t *offset, off_t *start)
150 {
151 off_t nstrip;
152 u_int strip_size;
153
154 strip_size = vol->v_strip_size;
155 /* Strip number. */
156 nstrip = virt / strip_size;
157 /* Start position in strip. */
158 *start = virt % strip_size;
159 /* Disk number. */
160 *disk = (nstrip * N) % vol->v_disks_count;
161 /* Strip start position in disk. */
162 *offset = ((nstrip * N) / vol->v_disks_count) * strip_size;
163 }
164
165 static inline void
166 P2V(struct g_raid_volume *vol, int disk, off_t offset,
167 off_t *virt, int *copy)
168 {
169 off_t nstrip, start;
170 u_int strip_size;
171
172 strip_size = vol->v_strip_size;
173 /* Start position in strip. */
174 start = offset % strip_size;
175 /* Physical strip number. */
176 nstrip = (offset / strip_size) * vol->v_disks_count + disk;
177 /* Number of physical strip (copy) inside virtual strip. */
178 *copy = nstrip % N;
179 /* Offset in virtual space. */
180 *virt = (nstrip / N) * strip_size + start;
181 }
182
183 static int
184 g_raid_tr_taste_raid1e(struct g_raid_tr_object *tr, struct g_raid_volume *vol)
185 {
186 struct g_raid_tr_raid1e_object *trs;
187
188 trs = (struct g_raid_tr_raid1e_object *)tr;
189 if (tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_RAID1E ||
190 tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_R1EA)
191 return (G_RAID_TR_TASTE_FAIL);
192 trs->trso_starting = 1;
193 return (G_RAID_TR_TASTE_SUCCEED);
194 }
195
196 static int
197 g_raid_tr_update_state_raid1e_even(struct g_raid_volume *vol)
198 {
199 struct g_raid_softc *sc;
200 struct g_raid_subdisk *sd, *bestsd, *worstsd;
201 int i, j, state, sstate;
202
203 sc = vol->v_softc;
204 state = G_RAID_VOLUME_S_OPTIMAL;
205 for (i = 0; i < vol->v_disks_count / N; i++) {
206 bestsd = &vol->v_subdisks[i * N];
207 for (j = 1; j < N; j++) {
208 sd = &vol->v_subdisks[i * N + j];
209 if (sd->sd_state > bestsd->sd_state)
210 bestsd = sd;
211 else if (sd->sd_state == bestsd->sd_state &&
212 (sd->sd_state == G_RAID_SUBDISK_S_REBUILD ||
213 sd->sd_state == G_RAID_SUBDISK_S_RESYNC) &&
214 sd->sd_rebuild_pos > bestsd->sd_rebuild_pos)
215 bestsd = sd;
216 }
217 if (bestsd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED &&
218 bestsd->sd_state != G_RAID_SUBDISK_S_ACTIVE) {
219 /* We found reasonable candidate. */
220 G_RAID_DEBUG1(1, sc,
221 "Promote subdisk %s:%d from %s to ACTIVE.",
222 vol->v_name, bestsd->sd_pos,
223 g_raid_subdisk_state2str(bestsd->sd_state));
224 g_raid_change_subdisk_state(bestsd,
225 G_RAID_SUBDISK_S_ACTIVE);
226 g_raid_write_metadata(sc,
227 vol, bestsd, bestsd->sd_disk);
228 }
229 worstsd = &vol->v_subdisks[i * N];
230 for (j = 1; j < N; j++) {
231 sd = &vol->v_subdisks[i * N + j];
232 if (sd->sd_state < worstsd->sd_state)
233 worstsd = sd;
234 }
235 if (worstsd->sd_state == G_RAID_SUBDISK_S_ACTIVE)
236 sstate = G_RAID_VOLUME_S_OPTIMAL;
237 else if (worstsd->sd_state >= G_RAID_SUBDISK_S_STALE)
238 sstate = G_RAID_VOLUME_S_SUBOPTIMAL;
239 else if (bestsd->sd_state == G_RAID_SUBDISK_S_ACTIVE)
240 sstate = G_RAID_VOLUME_S_DEGRADED;
241 else
242 sstate = G_RAID_VOLUME_S_BROKEN;
243 if (sstate < state)
244 state = sstate;
245 }
246 return (state);
247 }
248
249 static int
250 g_raid_tr_update_state_raid1e_odd(struct g_raid_volume *vol)
251 {
252 struct g_raid_softc *sc;
253 struct g_raid_subdisk *sd, *bestsd, *worstsd;
254 int i, j, state, sstate;
255
256 sc = vol->v_softc;
257 if (g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE) ==
258 vol->v_disks_count)
259 return (G_RAID_VOLUME_S_OPTIMAL);
260 for (i = 0; i < vol->v_disks_count; i++) {
261 sd = &vol->v_subdisks[i];
262 if (sd->sd_state == G_RAID_SUBDISK_S_UNINITIALIZED) {
263 /* We found reasonable candidate. */
264 G_RAID_DEBUG1(1, sc,
265 "Promote subdisk %s:%d from %s to STALE.",
266 vol->v_name, sd->sd_pos,
267 g_raid_subdisk_state2str(sd->sd_state));
268 g_raid_change_subdisk_state(sd,
269 G_RAID_SUBDISK_S_STALE);
270 g_raid_write_metadata(sc, vol, sd, sd->sd_disk);
271 }
272 }
273 state = G_RAID_VOLUME_S_OPTIMAL;
274 for (i = 0; i < vol->v_disks_count; i++) {
275 bestsd = &vol->v_subdisks[i];
276 worstsd = &vol->v_subdisks[i];
277 for (j = 1; j < N; j++) {
278 sd = &vol->v_subdisks[(i + j) % vol->v_disks_count];
279 if (sd->sd_state > bestsd->sd_state)
280 bestsd = sd;
281 else if (sd->sd_state == bestsd->sd_state &&
282 (sd->sd_state == G_RAID_SUBDISK_S_REBUILD ||
283 sd->sd_state == G_RAID_SUBDISK_S_RESYNC) &&
284 sd->sd_rebuild_pos > bestsd->sd_rebuild_pos)
285 bestsd = sd;
286 if (sd->sd_state < worstsd->sd_state)
287 worstsd = sd;
288 }
289 if (worstsd->sd_state == G_RAID_SUBDISK_S_ACTIVE)
290 sstate = G_RAID_VOLUME_S_OPTIMAL;
291 else if (worstsd->sd_state >= G_RAID_SUBDISK_S_STALE)
292 sstate = G_RAID_VOLUME_S_SUBOPTIMAL;
293 else if (bestsd->sd_state >= G_RAID_SUBDISK_S_STALE)
294 sstate = G_RAID_VOLUME_S_DEGRADED;
295 else
296 sstate = G_RAID_VOLUME_S_BROKEN;
297 if (sstate < state)
298 state = sstate;
299 }
300 return (state);
301 }
302
303 static int
304 g_raid_tr_update_state_raid1e(struct g_raid_volume *vol,
305 struct g_raid_subdisk *sd)
306 {
307 struct g_raid_tr_raid1e_object *trs;
308 struct g_raid_softc *sc;
309 u_int s;
310
311 sc = vol->v_softc;
312 trs = (struct g_raid_tr_raid1e_object *)vol->v_tr;
313 if (trs->trso_stopping &&
314 (trs->trso_flags & TR_RAID1E_F_DOING_SOME) == 0)
315 s = G_RAID_VOLUME_S_STOPPED;
316 else if (trs->trso_starting)
317 s = G_RAID_VOLUME_S_STARTING;
318 else {
319 if ((vol->v_disks_count % N) == 0)
320 s = g_raid_tr_update_state_raid1e_even(vol);
321 else
322 s = g_raid_tr_update_state_raid1e_odd(vol);
323 }
324 if (s != vol->v_state) {
325 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ?
326 G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN,
327 G_RAID_EVENT_VOLUME);
328 g_raid_change_volume_state(vol, s);
329 if (!trs->trso_starting && !trs->trso_stopping)
330 g_raid_write_metadata(sc, vol, NULL, NULL);
331 }
332 if (!trs->trso_starting && !trs->trso_stopping)
333 g_raid_tr_raid1e_maybe_rebuild(vol->v_tr, sd);
334 return (0);
335 }
336
337 static void
338 g_raid_tr_raid1e_fail_disk(struct g_raid_softc *sc, struct g_raid_subdisk *sd,
339 struct g_raid_disk *disk)
340 {
341 struct g_raid_volume *vol;
342
343 vol = sd->sd_volume;
344 /*
345 * We don't fail the last disk in the pack, since it still has decent
346 * data on it and that's better than failing the disk if it is the root
347 * file system.
348 *
349 * XXX should this be controlled via a tunable? It makes sense for
350 * the volume that has / on it. I can't think of a case where we'd
351 * want the volume to go away on this kind of event.
352 */
353 if ((g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE) +
354 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC) +
355 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) +
356 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED) <
357 vol->v_disks_count) &&
358 (sd->sd_state >= G_RAID_SUBDISK_S_UNINITIALIZED))
359 return;
360 g_raid_fail_disk(sc, sd, disk);
361 }
362
363 static void
364 g_raid_tr_raid1e_rebuild_done(struct g_raid_tr_raid1e_object *trs)
365 {
366 struct g_raid_volume *vol;
367 struct g_raid_subdisk *sd;
368
369 vol = trs->trso_base.tro_volume;
370 sd = trs->trso_failed_sd;
371 g_raid_write_metadata(vol->v_softc, vol, sd, sd->sd_disk);
372 free(trs->trso_buffer, M_TR_RAID1E);
373 trs->trso_buffer = NULL;
374 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME;
375 trs->trso_type = TR_RAID1E_NONE;
376 trs->trso_recover_slabs = 0;
377 trs->trso_failed_sd = NULL;
378 g_raid_tr_update_state_raid1e(vol, NULL);
379 }
380
381 static void
382 g_raid_tr_raid1e_rebuild_finish(struct g_raid_tr_object *tr)
383 {
384 struct g_raid_tr_raid1e_object *trs;
385 struct g_raid_subdisk *sd;
386
387 trs = (struct g_raid_tr_raid1e_object *)tr;
388 sd = trs->trso_failed_sd;
389 G_RAID_DEBUG1(0, tr->tro_volume->v_softc,
390 "Subdisk %s:%d-%s rebuild completed.",
391 sd->sd_volume->v_name, sd->sd_pos,
392 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]");
393 g_raid_change_subdisk_state(sd, G_RAID_SUBDISK_S_ACTIVE);
394 sd->sd_rebuild_pos = 0;
395 g_raid_tr_raid1e_rebuild_done(trs);
396 }
397
398 static void
399 g_raid_tr_raid1e_rebuild_abort(struct g_raid_tr_object *tr)
400 {
401 struct g_raid_tr_raid1e_object *trs;
402 struct g_raid_subdisk *sd;
403 struct g_raid_volume *vol;
404
405 vol = tr->tro_volume;
406 trs = (struct g_raid_tr_raid1e_object *)tr;
407 sd = trs->trso_failed_sd;
408 if (trs->trso_flags & TR_RAID1E_F_DOING_SOME) {
409 G_RAID_DEBUG1(1, vol->v_softc,
410 "Subdisk %s:%d-%s rebuild is aborting.",
411 sd->sd_volume->v_name, sd->sd_pos,
412 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]");
413 trs->trso_flags |= TR_RAID1E_F_ABORT;
414 } else {
415 G_RAID_DEBUG1(0, vol->v_softc,
416 "Subdisk %s:%d-%s rebuild aborted.",
417 sd->sd_volume->v_name, sd->sd_pos,
418 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]");
419 trs->trso_flags &= ~TR_RAID1E_F_ABORT;
420 if (trs->trso_flags & TR_RAID1E_F_LOCKED) {
421 trs->trso_flags &= ~TR_RAID1E_F_LOCKED;
422 g_raid_unlock_range(tr->tro_volume,
423 trs->trso_lock_pos, trs->trso_lock_len);
424 }
425 g_raid_tr_raid1e_rebuild_done(trs);
426 }
427 }
428
429 static void
430 g_raid_tr_raid1e_rebuild_some(struct g_raid_tr_object *tr)
431 {
432 struct g_raid_tr_raid1e_object *trs;
433 struct g_raid_softc *sc;
434 struct g_raid_volume *vol;
435 struct g_raid_subdisk *sd;
436 struct bio *bp;
437 off_t len, virtual, vend, offset, start;
438 int disk, copy, best;
439
440 trs = (struct g_raid_tr_raid1e_object *)tr;
441 if (trs->trso_flags & TR_RAID1E_F_DOING_SOME)
442 return;
443 vol = tr->tro_volume;
444 sc = vol->v_softc;
445 sd = trs->trso_failed_sd;
446
447 while (1) {
448 if (sd->sd_rebuild_pos >= sd->sd_size) {
449 g_raid_tr_raid1e_rebuild_finish(tr);
450 return;
451 }
452 /* Get virtual offset from physical rebuild position. */
453 P2V(vol, sd->sd_pos, sd->sd_rebuild_pos, &virtual, ©);
454 /* Get physical offset back to get first stripe position. */
455 V2P(vol, virtual, &disk, &offset, &start);
456 /* Calculate contignous data length. */
457 len = MIN(g_raid1e_rebuild_slab,
458 sd->sd_size - sd->sd_rebuild_pos);
459 if ((vol->v_disks_count % N) != 0)
460 len = MIN(len, vol->v_strip_size - start);
461 /* Find disk with most accurate data. */
462 best = g_raid_tr_raid1e_select_read_disk(vol, disk,
463 offset + start, len, 0);
464 if (best < 0) {
465 /* There is no any valid disk. */
466 g_raid_tr_raid1e_rebuild_abort(tr);
467 return;
468 } else if (best != copy) {
469 /* Some other disk has better data. */
470 break;
471 }
472 /* We have the most accurate data. Skip the range. */
473 G_RAID_DEBUG1(3, sc, "Skipping rebuild for range %ju - %ju",
474 sd->sd_rebuild_pos, sd->sd_rebuild_pos + len);
475 sd->sd_rebuild_pos += len;
476 }
477
478 bp = &trs->trso_bio;
479 memset(bp, 0, sizeof(*bp));
480 bp->bio_offset = offset + start +
481 ((disk + best >= vol->v_disks_count) ? vol->v_strip_size : 0);
482 bp->bio_length = len;
483 bp->bio_data = trs->trso_buffer;
484 bp->bio_cmd = BIO_READ;
485 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC;
486 bp->bio_caller1 = &vol->v_subdisks[(disk + best) % vol->v_disks_count];
487 G_RAID_LOGREQ(3, bp, "Queueing rebuild read");
488 /*
489 * If we are crossing stripe boundary, correct affected virtual
490 * range we should lock.
491 */
492 if (start + len > vol->v_strip_size) {
493 P2V(vol, sd->sd_pos, sd->sd_rebuild_pos + len, &vend, ©);
494 len = vend - virtual;
495 }
496 trs->trso_flags |= TR_RAID1E_F_DOING_SOME;
497 trs->trso_flags |= TR_RAID1E_F_LOCKED;
498 trs->trso_lock_pos = virtual;
499 trs->trso_lock_len = len;
500 /* Lock callback starts I/O */
501 g_raid_lock_range(sd->sd_volume, virtual, len, NULL, bp);
502 }
503
504 static void
505 g_raid_tr_raid1e_rebuild_start(struct g_raid_tr_object *tr)
506 {
507 struct g_raid_volume *vol;
508 struct g_raid_tr_raid1e_object *trs;
509 struct g_raid_subdisk *sd;
510
511 vol = tr->tro_volume;
512 trs = (struct g_raid_tr_raid1e_object *)tr;
513 if (trs->trso_failed_sd) {
514 G_RAID_DEBUG1(1, vol->v_softc,
515 "Already rebuild in start rebuild. pos %jd\n",
516 (intmax_t)trs->trso_failed_sd->sd_rebuild_pos);
517 return;
518 }
519 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_RESYNC);
520 if (sd == NULL)
521 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_REBUILD);
522 if (sd == NULL) {
523 sd = g_raid_get_subdisk(vol, G_RAID_SUBDISK_S_STALE);
524 if (sd != NULL) {
525 sd->sd_rebuild_pos = 0;
526 g_raid_change_subdisk_state(sd,
527 G_RAID_SUBDISK_S_RESYNC);
528 g_raid_write_metadata(vol->v_softc, vol, sd, NULL);
529 } else {
530 sd = g_raid_get_subdisk(vol,
531 G_RAID_SUBDISK_S_UNINITIALIZED);
532 if (sd == NULL)
533 sd = g_raid_get_subdisk(vol,
534 G_RAID_SUBDISK_S_NEW);
535 if (sd != NULL) {
536 sd->sd_rebuild_pos = 0;
537 g_raid_change_subdisk_state(sd,
538 G_RAID_SUBDISK_S_REBUILD);
539 g_raid_write_metadata(vol->v_softc,
540 vol, sd, NULL);
541 }
542 }
543 }
544 if (sd == NULL) {
545 G_RAID_DEBUG1(1, vol->v_softc,
546 "No failed disk to rebuild. night night.");
547 return;
548 }
549 trs->trso_failed_sd = sd;
550 G_RAID_DEBUG1(0, vol->v_softc,
551 "Subdisk %s:%d-%s rebuild start at %jd.",
552 sd->sd_volume->v_name, sd->sd_pos,
553 sd->sd_disk ? g_raid_get_diskname(sd->sd_disk) : "[none]",
554 trs->trso_failed_sd->sd_rebuild_pos);
555 trs->trso_type = TR_RAID1E_REBUILD;
556 trs->trso_buffer = malloc(g_raid1e_rebuild_slab, M_TR_RAID1E, M_WAITOK);
557 trs->trso_meta_update = g_raid1e_rebuild_meta_update;
558 g_raid_tr_raid1e_rebuild_some(tr);
559 }
560
561 static void
562 g_raid_tr_raid1e_maybe_rebuild(struct g_raid_tr_object *tr,
563 struct g_raid_subdisk *sd)
564 {
565 struct g_raid_volume *vol;
566 struct g_raid_tr_raid1e_object *trs;
567 int nr;
568
569 vol = tr->tro_volume;
570 trs = (struct g_raid_tr_raid1e_object *)tr;
571 if (trs->trso_stopping)
572 return;
573 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_REBUILD) +
574 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC);
575 switch(trs->trso_type) {
576 case TR_RAID1E_NONE:
577 if (vol->v_state < G_RAID_VOLUME_S_DEGRADED)
578 return;
579 if (nr == 0) {
580 nr = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_NEW) +
581 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) +
582 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED);
583 if (nr == 0)
584 return;
585 }
586 g_raid_tr_raid1e_rebuild_start(tr);
587 break;
588 case TR_RAID1E_REBUILD:
589 if (vol->v_state < G_RAID_VOLUME_S_DEGRADED || nr == 0 ||
590 trs->trso_failed_sd == sd)
591 g_raid_tr_raid1e_rebuild_abort(tr);
592 break;
593 case TR_RAID1E_RESYNC:
594 break;
595 }
596 }
597
598 static int
599 g_raid_tr_event_raid1e(struct g_raid_tr_object *tr,
600 struct g_raid_subdisk *sd, u_int event)
601 {
602
603 g_raid_tr_update_state_raid1e(tr->tro_volume, sd);
604 return (0);
605 }
606
607 static int
608 g_raid_tr_start_raid1e(struct g_raid_tr_object *tr)
609 {
610 struct g_raid_tr_raid1e_object *trs;
611 struct g_raid_volume *vol;
612
613 trs = (struct g_raid_tr_raid1e_object *)tr;
614 vol = tr->tro_volume;
615 trs->trso_starting = 0;
616 g_raid_tr_update_state_raid1e(vol, NULL);
617 return (0);
618 }
619
620 static int
621 g_raid_tr_stop_raid1e(struct g_raid_tr_object *tr)
622 {
623 struct g_raid_tr_raid1e_object *trs;
624 struct g_raid_volume *vol;
625
626 trs = (struct g_raid_tr_raid1e_object *)tr;
627 vol = tr->tro_volume;
628 trs->trso_starting = 0;
629 trs->trso_stopping = 1;
630 g_raid_tr_update_state_raid1e(vol, NULL);
631 return (0);
632 }
633
634 /*
635 * Select the disk to read from. Take into account: subdisk state, running
636 * error recovery, average disk load, head position and possible cache hits.
637 */
638 #define ABS(x) (((x) >= 0) ? (x) : (-(x)))
639 static int
640 g_raid_tr_raid1e_select_read_disk(struct g_raid_volume *vol,
641 int no, off_t off, off_t len, u_int mask)
642 {
643 struct g_raid_subdisk *sd;
644 off_t offset;
645 int i, best, prio, bestprio;
646
647 best = -1;
648 bestprio = INT_MAX;
649 for (i = 0; i < N; i++) {
650 sd = &vol->v_subdisks[(no + i) % vol->v_disks_count];
651 offset = off;
652 if (no + i >= vol->v_disks_count)
653 offset += vol->v_strip_size;
654
655 prio = G_RAID_SUBDISK_LOAD(sd);
656 if ((mask & (1 << sd->sd_pos)) != 0)
657 continue;
658 switch (sd->sd_state) {
659 case G_RAID_SUBDISK_S_ACTIVE:
660 break;
661 case G_RAID_SUBDISK_S_RESYNC:
662 if (offset + off < sd->sd_rebuild_pos)
663 break;
664 /* FALLTHROUGH */
665 case G_RAID_SUBDISK_S_STALE:
666 prio += i << 24;
667 break;
668 case G_RAID_SUBDISK_S_REBUILD:
669 if (offset + off < sd->sd_rebuild_pos)
670 break;
671 /* FALLTHROUGH */
672 default:
673 continue;
674 }
675 prio += min(sd->sd_recovery, 255) << 16;
676 /* If disk head is precisely in position - highly prefer it. */
677 if (G_RAID_SUBDISK_POS(sd) == offset)
678 prio -= 2 * G_RAID_SUBDISK_LOAD_SCALE;
679 else
680 /* If disk head is close to position - prefer it. */
681 if (ABS(G_RAID_SUBDISK_POS(sd) - offset) <
682 G_RAID_SUBDISK_TRACK_SIZE)
683 prio -= 1 * G_RAID_SUBDISK_LOAD_SCALE;
684 if (prio < bestprio) {
685 bestprio = prio;
686 best = i;
687 }
688 }
689 return (best);
690 }
691
692 static void
693 g_raid_tr_iostart_raid1e_read(struct g_raid_tr_object *tr, struct bio *bp)
694 {
695 struct g_raid_volume *vol;
696 struct g_raid_subdisk *sd;
697 struct bio_queue_head queue;
698 struct bio *cbp;
699 char *addr;
700 off_t offset, start, length, remain;
701 u_int no, strip_size;
702 int best;
703
704 vol = tr->tro_volume;
705 if ((bp->bio_flags & BIO_UNMAPPED) != 0)
706 addr = NULL;
707 else
708 addr = bp->bio_data;
709 strip_size = vol->v_strip_size;
710 V2P(vol, bp->bio_offset, &no, &offset, &start);
711 remain = bp->bio_length;
712 bioq_init(&queue);
713 while (remain > 0) {
714 length = MIN(strip_size - start, remain);
715 best = g_raid_tr_raid1e_select_read_disk(vol,
716 no, offset, length, 0);
717 KASSERT(best >= 0, ("No readable disk in volume %s!",
718 vol->v_name));
719 no += best;
720 if (no >= vol->v_disks_count) {
721 no -= vol->v_disks_count;
722 offset += strip_size;
723 }
724 cbp = g_clone_bio(bp);
725 if (cbp == NULL)
726 goto failure;
727 cbp->bio_offset = offset + start;
728 cbp->bio_length = length;
729 if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
730 cbp->bio_ma_offset += (uintptr_t)addr;
731 cbp->bio_ma += cbp->bio_ma_offset / PAGE_SIZE;
732 cbp->bio_ma_offset %= PAGE_SIZE;
733 cbp->bio_ma_n = round_page(cbp->bio_ma_offset +
734 cbp->bio_length) / PAGE_SIZE;
735 } else
736 cbp->bio_data = addr;
737 cbp->bio_caller1 = &vol->v_subdisks[no];
738 bioq_insert_tail(&queue, cbp);
739 no += N - best;
740 if (no >= vol->v_disks_count) {
741 no -= vol->v_disks_count;
742 offset += strip_size;
743 }
744 remain -= length;
745 addr += length;
746 start = 0;
747 }
748 while ((cbp = bioq_takefirst(&queue)) != NULL) {
749 sd = cbp->bio_caller1;
750 cbp->bio_caller1 = NULL;
751 g_raid_subdisk_iostart(sd, cbp);
752 }
753 return;
754 failure:
755 while ((cbp = bioq_takefirst(&queue)) != NULL)
756 g_destroy_bio(cbp);
757 if (bp->bio_error == 0)
758 bp->bio_error = ENOMEM;
759 g_raid_iodone(bp, bp->bio_error);
760 }
761
762 static void
763 g_raid_tr_iostart_raid1e_write(struct g_raid_tr_object *tr, struct bio *bp)
764 {
765 struct g_raid_volume *vol;
766 struct g_raid_subdisk *sd;
767 struct bio_queue_head queue;
768 struct bio *cbp;
769 char *addr;
770 off_t offset, start, length, remain;
771 u_int no, strip_size;
772 int i;
773
774 vol = tr->tro_volume;
775 if ((bp->bio_flags & BIO_UNMAPPED) != 0)
776 addr = NULL;
777 else
778 addr = bp->bio_data;
779 strip_size = vol->v_strip_size;
780 V2P(vol, bp->bio_offset, &no, &offset, &start);
781 remain = bp->bio_length;
782 bioq_init(&queue);
783 while (remain > 0) {
784 length = MIN(strip_size - start, remain);
785 for (i = 0; i < N; i++) {
786 sd = &vol->v_subdisks[no];
787 switch (sd->sd_state) {
788 case G_RAID_SUBDISK_S_ACTIVE:
789 case G_RAID_SUBDISK_S_STALE:
790 case G_RAID_SUBDISK_S_RESYNC:
791 break;
792 case G_RAID_SUBDISK_S_REBUILD:
793 if (offset + start >= sd->sd_rebuild_pos)
794 goto nextdisk;
795 break;
796 default:
797 goto nextdisk;
798 }
799 cbp = g_clone_bio(bp);
800 if (cbp == NULL)
801 goto failure;
802 cbp->bio_offset = offset + start;
803 cbp->bio_length = length;
804 if ((bp->bio_flags & BIO_UNMAPPED) != 0 &&
805 bp->bio_cmd != BIO_DELETE) {
806 cbp->bio_ma_offset += (uintptr_t)addr;
807 cbp->bio_ma += cbp->bio_ma_offset / PAGE_SIZE;
808 cbp->bio_ma_offset %= PAGE_SIZE;
809 cbp->bio_ma_n = round_page(cbp->bio_ma_offset +
810 cbp->bio_length) / PAGE_SIZE;
811 } else
812 cbp->bio_data = addr;
813 cbp->bio_caller1 = sd;
814 bioq_insert_tail(&queue, cbp);
815 nextdisk:
816 if (++no >= vol->v_disks_count) {
817 no = 0;
818 offset += strip_size;
819 }
820 }
821 remain -= length;
822 if (bp->bio_cmd != BIO_DELETE)
823 addr += length;
824 start = 0;
825 }
826 while ((cbp = bioq_takefirst(&queue)) != NULL) {
827 sd = cbp->bio_caller1;
828 cbp->bio_caller1 = NULL;
829 g_raid_subdisk_iostart(sd, cbp);
830 }
831 return;
832 failure:
833 while ((cbp = bioq_takefirst(&queue)) != NULL)
834 g_destroy_bio(cbp);
835 if (bp->bio_error == 0)
836 bp->bio_error = ENOMEM;
837 g_raid_iodone(bp, bp->bio_error);
838 }
839
840 static void
841 g_raid_tr_iostart_raid1e(struct g_raid_tr_object *tr, struct bio *bp)
842 {
843 struct g_raid_volume *vol;
844 struct g_raid_tr_raid1e_object *trs;
845
846 vol = tr->tro_volume;
847 trs = (struct g_raid_tr_raid1e_object *)tr;
848 if (vol->v_state != G_RAID_VOLUME_S_OPTIMAL &&
849 vol->v_state != G_RAID_VOLUME_S_SUBOPTIMAL &&
850 vol->v_state != G_RAID_VOLUME_S_DEGRADED) {
851 g_raid_iodone(bp, EIO);
852 return;
853 }
854 /*
855 * If we're rebuilding, squeeze in rebuild activity every so often,
856 * even when the disk is busy. Be sure to only count real I/O
857 * to the disk. All 'SPECIAL' I/O is traffic generated to the disk
858 * by this module.
859 */
860 if (trs->trso_failed_sd != NULL &&
861 !(bp->bio_cflags & G_RAID_BIO_FLAG_SPECIAL)) {
862 /* Make this new or running now round short. */
863 trs->trso_recover_slabs = 0;
864 if (--trs->trso_fair_io <= 0) {
865 trs->trso_fair_io = g_raid1e_rebuild_fair_io;
866 g_raid_tr_raid1e_rebuild_some(tr);
867 }
868 }
869 switch (bp->bio_cmd) {
870 case BIO_READ:
871 g_raid_tr_iostart_raid1e_read(tr, bp);
872 break;
873 case BIO_WRITE:
874 case BIO_DELETE:
875 g_raid_tr_iostart_raid1e_write(tr, bp);
876 break;
877 case BIO_FLUSH:
878 g_raid_tr_flush_common(tr, bp);
879 break;
880 default:
881 KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)",
882 bp->bio_cmd, vol->v_name));
883 break;
884 }
885 }
886
887 static void
888 g_raid_tr_iodone_raid1e(struct g_raid_tr_object *tr,
889 struct g_raid_subdisk *sd, struct bio *bp)
890 {
891 struct bio *cbp;
892 struct g_raid_subdisk *nsd;
893 struct g_raid_volume *vol;
894 struct bio *pbp;
895 struct g_raid_tr_raid1e_object *trs;
896 off_t virtual, offset, start;
897 uintptr_t mask;
898 int error, do_write, copy, disk, best;
899
900 trs = (struct g_raid_tr_raid1e_object *)tr;
901 vol = tr->tro_volume;
902 if (bp->bio_cflags & G_RAID_BIO_FLAG_SYNC) {
903 if (trs->trso_type == TR_RAID1E_REBUILD) {
904 nsd = trs->trso_failed_sd;
905 if (bp->bio_cmd == BIO_READ) {
906
907 /* Immediately abort rebuild, if requested. */
908 if (trs->trso_flags & TR_RAID1E_F_ABORT) {
909 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME;
910 g_raid_tr_raid1e_rebuild_abort(tr);
911 return;
912 }
913
914 /* On read error, skip and cross fingers. */
915 if (bp->bio_error != 0) {
916 G_RAID_LOGREQ(0, bp,
917 "Read error during rebuild (%d), "
918 "possible data loss!",
919 bp->bio_error);
920 goto rebuild_round_done;
921 }
922
923 /*
924 * The read operation finished, queue the
925 * write and get out.
926 */
927 G_RAID_LOGREQ(3, bp, "Rebuild read done: %d",
928 bp->bio_error);
929 bp->bio_cmd = BIO_WRITE;
930 bp->bio_cflags = G_RAID_BIO_FLAG_SYNC;
931 bp->bio_offset = nsd->sd_rebuild_pos;
932 G_RAID_LOGREQ(3, bp, "Queueing rebuild write.");
933 g_raid_subdisk_iostart(nsd, bp);
934 } else {
935 /*
936 * The write operation just finished. Do
937 * another. We keep cloning the master bio
938 * since it has the right buffers allocated to
939 * it.
940 */
941 G_RAID_LOGREQ(3, bp, "Rebuild write done: %d",
942 bp->bio_error);
943 if (bp->bio_error != 0 ||
944 trs->trso_flags & TR_RAID1E_F_ABORT) {
945 if ((trs->trso_flags &
946 TR_RAID1E_F_ABORT) == 0) {
947 g_raid_tr_raid1e_fail_disk(sd->sd_softc,
948 nsd, nsd->sd_disk);
949 }
950 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME;
951 g_raid_tr_raid1e_rebuild_abort(tr);
952 return;
953 }
954 rebuild_round_done:
955 trs->trso_flags &= ~TR_RAID1E_F_LOCKED;
956 g_raid_unlock_range(tr->tro_volume,
957 trs->trso_lock_pos, trs->trso_lock_len);
958 nsd->sd_rebuild_pos += bp->bio_length;
959 if (nsd->sd_rebuild_pos >= nsd->sd_size) {
960 g_raid_tr_raid1e_rebuild_finish(tr);
961 return;
962 }
963
964 /* Abort rebuild if we are stopping */
965 if (trs->trso_stopping) {
966 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME;
967 g_raid_tr_raid1e_rebuild_abort(tr);
968 return;
969 }
970
971 if (--trs->trso_meta_update <= 0) {
972 g_raid_write_metadata(vol->v_softc,
973 vol, nsd, nsd->sd_disk);
974 trs->trso_meta_update =
975 g_raid1e_rebuild_meta_update;
976 /* Compensate short rebuild I/Os. */
977 if ((vol->v_disks_count % N) != 0 &&
978 vol->v_strip_size <
979 g_raid1e_rebuild_slab) {
980 trs->trso_meta_update *=
981 g_raid1e_rebuild_slab;
982 trs->trso_meta_update /=
983 vol->v_strip_size;
984 }
985 }
986 trs->trso_flags &= ~TR_RAID1E_F_DOING_SOME;
987 if (--trs->trso_recover_slabs <= 0)
988 return;
989 /* Run next rebuild iteration. */
990 g_raid_tr_raid1e_rebuild_some(tr);
991 }
992 } else if (trs->trso_type == TR_RAID1E_RESYNC) {
993 /*
994 * read good sd, read bad sd in parallel. when both
995 * done, compare the buffers. write good to the bad
996 * if different. do the next bit of work.
997 */
998 panic("Somehow, we think we're doing a resync");
999 }
1000 return;
1001 }
1002 pbp = bp->bio_parent;
1003 pbp->bio_inbed++;
1004 mask = (intptr_t)bp->bio_caller2;
1005 if (bp->bio_cmd == BIO_READ && bp->bio_error != 0) {
1006 /*
1007 * Read failed on first drive. Retry the read error on
1008 * another disk drive, if available, before erroring out the
1009 * read.
1010 */
1011 sd->sd_disk->d_read_errs++;
1012 G_RAID_LOGREQ(0, bp,
1013 "Read error (%d), %d read errors total",
1014 bp->bio_error, sd->sd_disk->d_read_errs);
1015
1016 /*
1017 * If there are too many read errors, we move to degraded.
1018 * XXX Do we want to FAIL the drive (eg, make the user redo
1019 * everything to get it back in sync), or just degrade the
1020 * drive, which kicks off a resync?
1021 */
1022 do_write = 0;
1023 if (sd->sd_disk->d_read_errs > g_raid_read_err_thresh)
1024 g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk);
1025 else if (mask == 0)
1026 do_write = 1;
1027
1028 /* Restore what we were doing. */
1029 P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©);
1030 V2P(vol, virtual, &disk, &offset, &start);
1031
1032 /* Find the other disk, and try to do the I/O to it. */
1033 mask |= 1 << copy;
1034 best = g_raid_tr_raid1e_select_read_disk(vol,
1035 disk, offset, start, mask);
1036 if (best >= 0 && (cbp = g_clone_bio(pbp)) != NULL) {
1037 disk += best;
1038 if (disk >= vol->v_disks_count) {
1039 disk -= vol->v_disks_count;
1040 offset += vol->v_strip_size;
1041 }
1042 cbp->bio_offset = offset + start;
1043 cbp->bio_length = bp->bio_length;
1044 cbp->bio_data = bp->bio_data;
1045 cbp->bio_ma = bp->bio_ma;
1046 cbp->bio_ma_offset = bp->bio_ma_offset;
1047 cbp->bio_ma_n = bp->bio_ma_n;
1048 g_destroy_bio(bp);
1049 nsd = &vol->v_subdisks[disk];
1050 G_RAID_LOGREQ(2, cbp, "Retrying read from %d",
1051 nsd->sd_pos);
1052 if (do_write)
1053 mask |= 1 << 31;
1054 if ((mask & (1U << 31)) != 0)
1055 sd->sd_recovery++;
1056 cbp->bio_caller2 = (void *)mask;
1057 if (do_write) {
1058 cbp->bio_caller1 = nsd;
1059 /* Lock callback starts I/O */
1060 g_raid_lock_range(sd->sd_volume,
1061 virtual, cbp->bio_length, pbp, cbp);
1062 } else {
1063 g_raid_subdisk_iostart(nsd, cbp);
1064 }
1065 return;
1066 }
1067 /*
1068 * We can't retry. Return the original error by falling
1069 * through. This will happen when there's only one good disk.
1070 * We don't need to fail the raid, since its actual state is
1071 * based on the state of the subdisks.
1072 */
1073 G_RAID_LOGREQ(2, bp, "Couldn't retry read, failing it");
1074 }
1075 if (bp->bio_cmd == BIO_READ &&
1076 bp->bio_error == 0 &&
1077 (mask & (1U << 31)) != 0) {
1078 G_RAID_LOGREQ(3, bp, "Recovered data from other drive");
1079
1080 /* Restore what we were doing. */
1081 P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©);
1082 V2P(vol, virtual, &disk, &offset, &start);
1083
1084 /* Find best disk to write. */
1085 best = g_raid_tr_raid1e_select_read_disk(vol,
1086 disk, offset, start, ~mask);
1087 if (best >= 0 && (cbp = g_clone_bio(pbp)) != NULL) {
1088 disk += best;
1089 if (disk >= vol->v_disks_count) {
1090 disk -= vol->v_disks_count;
1091 offset += vol->v_strip_size;
1092 }
1093 cbp->bio_offset = offset + start;
1094 cbp->bio_cmd = BIO_WRITE;
1095 cbp->bio_cflags = G_RAID_BIO_FLAG_REMAP;
1096 cbp->bio_caller2 = (void *)mask;
1097 g_destroy_bio(bp);
1098 G_RAID_LOGREQ(2, cbp,
1099 "Attempting bad sector remap on failing drive.");
1100 g_raid_subdisk_iostart(&vol->v_subdisks[disk], cbp);
1101 return;
1102 }
1103 }
1104 if ((mask & (1U << 31)) != 0) {
1105 /*
1106 * We're done with a recovery, mark the range as unlocked.
1107 * For any write errors, we agressively fail the disk since
1108 * there was both a READ and a WRITE error at this location.
1109 * Both types of errors generally indicates the drive is on
1110 * the verge of total failure anyway. Better to stop trusting
1111 * it now. However, we need to reset error to 0 in that case
1112 * because we're not failing the original I/O which succeeded.
1113 */
1114
1115 /* Restore what we were doing. */
1116 P2V(vol, sd->sd_pos, bp->bio_offset, &virtual, ©);
1117 V2P(vol, virtual, &disk, &offset, &start);
1118
1119 for (copy = 0; copy < N; copy++) {
1120 if ((mask & (1 << copy) ) != 0)
1121 vol->v_subdisks[(disk + copy) %
1122 vol->v_disks_count].sd_recovery--;
1123 }
1124
1125 if (bp->bio_cmd == BIO_WRITE && bp->bio_error) {
1126 G_RAID_LOGREQ(0, bp, "Remap write failed: "
1127 "failing subdisk.");
1128 g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk);
1129 bp->bio_error = 0;
1130 }
1131 G_RAID_LOGREQ(2, bp, "REMAP done %d.", bp->bio_error);
1132 g_raid_unlock_range(sd->sd_volume, virtual, bp->bio_length);
1133 }
1134 if (pbp->bio_cmd != BIO_READ) {
1135 if (pbp->bio_inbed == 1 || pbp->bio_error != 0)
1136 pbp->bio_error = bp->bio_error;
1137 if (pbp->bio_cmd == BIO_WRITE && bp->bio_error != 0) {
1138 G_RAID_LOGREQ(0, bp, "Write failed: failing subdisk.");
1139 g_raid_tr_raid1e_fail_disk(sd->sd_softc, sd, sd->sd_disk);
1140 }
1141 error = pbp->bio_error;
1142 } else
1143 error = bp->bio_error;
1144 g_destroy_bio(bp);
1145 if (pbp->bio_children == pbp->bio_inbed) {
1146 pbp->bio_completed = pbp->bio_length;
1147 g_raid_iodone(pbp, error);
1148 }
1149 }
1150
1151 static int
1152 g_raid_tr_kerneldump_raid1e(struct g_raid_tr_object *tr,
1153 void *virtual, vm_offset_t physical, off_t boffset, size_t blength)
1154 {
1155 struct g_raid_volume *vol;
1156 struct g_raid_subdisk *sd;
1157 struct bio_queue_head queue;
1158 char *addr;
1159 off_t offset, start, length, remain;
1160 u_int no, strip_size;
1161 int i, error;
1162
1163 vol = tr->tro_volume;
1164 addr = virtual;
1165 strip_size = vol->v_strip_size;
1166 V2P(vol, boffset, &no, &offset, &start);
1167 remain = blength;
1168 bioq_init(&queue);
1169 while (remain > 0) {
1170 length = MIN(strip_size - start, remain);
1171 for (i = 0; i < N; i++) {
1172 sd = &vol->v_subdisks[no];
1173 switch (sd->sd_state) {
1174 case G_RAID_SUBDISK_S_ACTIVE:
1175 case G_RAID_SUBDISK_S_STALE:
1176 case G_RAID_SUBDISK_S_RESYNC:
1177 break;
1178 case G_RAID_SUBDISK_S_REBUILD:
1179 if (offset + start >= sd->sd_rebuild_pos)
1180 goto nextdisk;
1181 break;
1182 default:
1183 goto nextdisk;
1184 }
1185 error = g_raid_subdisk_kerneldump(sd,
1186 addr, 0, offset + start, length);
1187 if (error != 0)
1188 return (error);
1189 nextdisk:
1190 if (++no >= vol->v_disks_count) {
1191 no = 0;
1192 offset += strip_size;
1193 }
1194 }
1195 remain -= length;
1196 addr += length;
1197 start = 0;
1198 }
1199 return (0);
1200 }
1201
1202 static int
1203 g_raid_tr_locked_raid1e(struct g_raid_tr_object *tr, void *argp)
1204 {
1205 struct bio *bp;
1206 struct g_raid_subdisk *sd;
1207
1208 bp = (struct bio *)argp;
1209 sd = (struct g_raid_subdisk *)bp->bio_caller1;
1210 g_raid_subdisk_iostart(sd, bp);
1211
1212 return (0);
1213 }
1214
1215 static int
1216 g_raid_tr_idle_raid1e(struct g_raid_tr_object *tr)
1217 {
1218 struct g_raid_tr_raid1e_object *trs;
1219 struct g_raid_volume *vol;
1220
1221 vol = tr->tro_volume;
1222 trs = (struct g_raid_tr_raid1e_object *)tr;
1223 trs->trso_fair_io = g_raid1e_rebuild_fair_io;
1224 trs->trso_recover_slabs = g_raid1e_rebuild_cluster_idle;
1225 /* Compensate short rebuild I/Os. */
1226 if ((vol->v_disks_count % N) != 0 &&
1227 vol->v_strip_size < g_raid1e_rebuild_slab) {
1228 trs->trso_recover_slabs *= g_raid1e_rebuild_slab;
1229 trs->trso_recover_slabs /= vol->v_strip_size;
1230 }
1231 if (trs->trso_type == TR_RAID1E_REBUILD)
1232 g_raid_tr_raid1e_rebuild_some(tr);
1233 return (0);
1234 }
1235
1236 static int
1237 g_raid_tr_free_raid1e(struct g_raid_tr_object *tr)
1238 {
1239 struct g_raid_tr_raid1e_object *trs;
1240
1241 trs = (struct g_raid_tr_raid1e_object *)tr;
1242
1243 if (trs->trso_buffer != NULL) {
1244 free(trs->trso_buffer, M_TR_RAID1E);
1245 trs->trso_buffer = NULL;
1246 }
1247 return (0);
1248 }
1249
1250 G_RAID_TR_DECLARE(raid1e, "RAID1E");
Cache object: 6edca37f1cfeed148759fe28c4f64699
|