1 /*-
2 * Copyright (c) 2012 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/9.1/sys/geom/raid/tr_raid5.c 240558 2012-09-16 11:02:22Z mav $");
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 static MALLOC_DEFINE(M_TR_RAID5, "tr_raid5_data", "GEOM_RAID RAID5 data");
46
47 #define TR_RAID5_NONE 0
48 #define TR_RAID5_REBUILD 1
49 #define TR_RAID5_RESYNC 2
50
51 #define TR_RAID5_F_DOING_SOME 0x1
52 #define TR_RAID5_F_LOCKED 0x2
53 #define TR_RAID5_F_ABORT 0x4
54
55 struct g_raid_tr_raid5_object {
56 struct g_raid_tr_object trso_base;
57 int trso_starting;
58 int trso_stopping;
59 int trso_type;
60 int trso_recover_slabs; /* slabs before rest */
61 int trso_fair_io;
62 int trso_meta_update;
63 int trso_flags;
64 struct g_raid_subdisk *trso_failed_sd; /* like per volume */
65 void *trso_buffer; /* Buffer space */
66 struct bio trso_bio;
67 };
68
69 static g_raid_tr_taste_t g_raid_tr_taste_raid5;
70 static g_raid_tr_event_t g_raid_tr_event_raid5;
71 static g_raid_tr_start_t g_raid_tr_start_raid5;
72 static g_raid_tr_stop_t g_raid_tr_stop_raid5;
73 static g_raid_tr_iostart_t g_raid_tr_iostart_raid5;
74 static g_raid_tr_iodone_t g_raid_tr_iodone_raid5;
75 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid5;
76 static g_raid_tr_locked_t g_raid_tr_locked_raid5;
77 static g_raid_tr_free_t g_raid_tr_free_raid5;
78
79 static kobj_method_t g_raid_tr_raid5_methods[] = {
80 KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid5),
81 KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid5),
82 KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid5),
83 KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid5),
84 KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid5),
85 KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid5),
86 KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid5),
87 KOBJMETHOD(g_raid_tr_locked, g_raid_tr_locked_raid5),
88 KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid5),
89 { 0, 0 }
90 };
91
92 static struct g_raid_tr_class g_raid_tr_raid5_class = {
93 "RAID5",
94 g_raid_tr_raid5_methods,
95 sizeof(struct g_raid_tr_raid5_object),
96 .trc_enable = 1,
97 .trc_priority = 100
98 };
99
100 static int
101 g_raid_tr_taste_raid5(struct g_raid_tr_object *tr, struct g_raid_volume *vol)
102 {
103 struct g_raid_tr_raid5_object *trs;
104 u_int qual;
105
106 trs = (struct g_raid_tr_raid5_object *)tr;
107 qual = tr->tro_volume->v_raid_level_qualifier;
108 if (tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID4 &&
109 qual >= 0 && qual <= 1) {
110 /* RAID4 */
111 } else if ((tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5 ||
112 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5E ||
113 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5EE ||
114 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID5R ||
115 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAID6 ||
116 tr->tro_volume->v_raid_level == G_RAID_VOLUME_RL_RAIDMDF) &&
117 qual >= 0 && qual <= 3) {
118 /* RAID5/5E/5EE/5R/6/MDF */
119 } else
120 return (G_RAID_TR_TASTE_FAIL);
121 trs->trso_starting = 1;
122 return (G_RAID_TR_TASTE_SUCCEED);
123 }
124
125 static int
126 g_raid_tr_update_state_raid5(struct g_raid_volume *vol,
127 struct g_raid_subdisk *sd)
128 {
129 struct g_raid_tr_raid5_object *trs;
130 struct g_raid_softc *sc;
131 u_int s;
132 int na, ns, nu;
133
134 sc = vol->v_softc;
135 trs = (struct g_raid_tr_raid5_object *)vol->v_tr;
136 if (trs->trso_stopping &&
137 (trs->trso_flags & TR_RAID5_F_DOING_SOME) == 0)
138 s = G_RAID_VOLUME_S_STOPPED;
139 else if (trs->trso_starting)
140 s = G_RAID_VOLUME_S_STARTING;
141 else {
142 na = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE);
143 ns = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_STALE) +
144 g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_RESYNC);
145 nu = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_UNINITIALIZED);
146 if (na == vol->v_disks_count)
147 s = G_RAID_VOLUME_S_OPTIMAL;
148 else if (na + ns == vol->v_disks_count ||
149 na + ns + nu == vol->v_disks_count /* XXX: Temporary. */)
150 s = G_RAID_VOLUME_S_SUBOPTIMAL;
151 else if (na == vol->v_disks_count - 1 ||
152 na + ns + nu == vol->v_disks_count)
153 s = G_RAID_VOLUME_S_DEGRADED;
154 else
155 s = G_RAID_VOLUME_S_BROKEN;
156 }
157 if (s != vol->v_state) {
158 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ?
159 G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN,
160 G_RAID_EVENT_VOLUME);
161 g_raid_change_volume_state(vol, s);
162 if (!trs->trso_starting && !trs->trso_stopping)
163 g_raid_write_metadata(sc, vol, NULL, NULL);
164 }
165 return (0);
166 }
167
168 static int
169 g_raid_tr_event_raid5(struct g_raid_tr_object *tr,
170 struct g_raid_subdisk *sd, u_int event)
171 {
172
173 g_raid_tr_update_state_raid5(tr->tro_volume, sd);
174 return (0);
175 }
176
177 static int
178 g_raid_tr_start_raid5(struct g_raid_tr_object *tr)
179 {
180 struct g_raid_tr_raid5_object *trs;
181 struct g_raid_volume *vol;
182
183 trs = (struct g_raid_tr_raid5_object *)tr;
184 vol = tr->tro_volume;
185 trs->trso_starting = 0;
186 g_raid_tr_update_state_raid5(vol, NULL);
187 return (0);
188 }
189
190 static int
191 g_raid_tr_stop_raid5(struct g_raid_tr_object *tr)
192 {
193 struct g_raid_tr_raid5_object *trs;
194 struct g_raid_volume *vol;
195
196 trs = (struct g_raid_tr_raid5_object *)tr;
197 vol = tr->tro_volume;
198 trs->trso_starting = 0;
199 trs->trso_stopping = 1;
200 g_raid_tr_update_state_raid5(vol, NULL);
201 return (0);
202 }
203
204 static void
205 g_raid_tr_iostart_raid5_read(struct g_raid_tr_object *tr, struct bio *bp)
206 {
207 struct g_raid_volume *vol;
208 struct g_raid_subdisk *sd;
209 struct bio_queue_head queue;
210 struct bio *cbp;
211 char *addr;
212 off_t offset, start, length, nstripe, remain;
213 int no, pno, ddisks, pdisks, protate, pleft;
214 u_int strip_size, lvl, qual;
215
216 vol = tr->tro_volume;
217 addr = bp->bio_data;
218 strip_size = vol->v_strip_size;
219 lvl = tr->tro_volume->v_raid_level;
220 qual = tr->tro_volume->v_raid_level_qualifier;
221 protate = tr->tro_volume->v_rotate_parity;
222
223 /* Stripe number. */
224 nstripe = bp->bio_offset / strip_size;
225 /* Start position in stripe. */
226 start = bp->bio_offset % strip_size;
227 /* Number of data and parity disks. */
228 if (lvl == G_RAID_VOLUME_RL_RAIDMDF)
229 pdisks = tr->tro_volume->v_mdf_pdisks;
230 else if (lvl == G_RAID_VOLUME_RL_RAID5EE ||
231 lvl == G_RAID_VOLUME_RL_RAID6)
232 pdisks = 2;
233 else
234 pdisks = 1;
235 ddisks = vol->v_disks_count - pdisks;
236 /* Parity disk number. */
237 if (lvl == G_RAID_VOLUME_RL_RAID4) {
238 if (qual == 0) /* P0 */
239 pno = 0;
240 else /* PN */
241 pno = ddisks;
242 pleft = -1;
243 } else {
244 pno = (nstripe / (ddisks * protate)) % vol->v_disks_count;
245 pleft = protate - (nstripe / ddisks) % protate;
246 if (qual >= 2) { /* PN/Left */
247 pno = ddisks - pno;
248 if (pno < 0)
249 pno += vol->v_disks_count;
250 }
251 }
252 /* Data disk number. */
253 no = nstripe % ddisks;
254 if (lvl == G_RAID_VOLUME_RL_RAID4) {
255 if (qual == 0)
256 no += pdisks;
257 } else if (qual & 1) { /* Continuation/Symmetric */
258 no = (pno + pdisks + no) % vol->v_disks_count;
259 } else if (no >= pno) /* Restart/Asymmetric */
260 no += pdisks;
261 else
262 no += imax(0, pno + pdisks - vol->v_disks_count);
263 /* Stripe start position in disk. */
264 offset = (nstripe / ddisks) * strip_size;
265 /* Length of data to operate. */
266 remain = bp->bio_length;
267
268 bioq_init(&queue);
269 do {
270 length = MIN(strip_size - start, remain);
271 cbp = g_clone_bio(bp);
272 if (cbp == NULL)
273 goto failure;
274 cbp->bio_offset = offset + start;
275 cbp->bio_data = addr;
276 cbp->bio_length = length;
277 cbp->bio_caller1 = &vol->v_subdisks[no];
278 bioq_insert_tail(&queue, cbp);
279 no++;
280 if (lvl == G_RAID_VOLUME_RL_RAID4) {
281 no %= vol->v_disks_count;
282 if (no == pno)
283 no = (no + pdisks) % vol->v_disks_count;
284 } else if (qual & 1) { /* Continuation/Symmetric */
285 no %= vol->v_disks_count;
286 if (no == pno) {
287 if ((--pleft) <= 0) {
288 pleft += protate;
289 if (qual < 2) /* P0/Right */
290 pno++;
291 else /* PN/Left */
292 pno += vol->v_disks_count - 1;
293 pno %= vol->v_disks_count;
294 }
295 no = (pno + pdisks) % vol->v_disks_count;
296 offset += strip_size;
297 }
298 } else { /* Restart/Asymmetric */
299 if (no == pno)
300 no += pdisks;
301 if (no >= vol->v_disks_count) {
302 no -= vol->v_disks_count;
303 if ((--pleft) <= 0) {
304 pleft += protate;
305 if (qual < 2) /* P0/Right */
306 pno++;
307 else /* PN/Left */
308 pno += vol->v_disks_count - 1;
309 pno %= vol->v_disks_count;
310 }
311 if (no == pno)
312 no += pdisks;
313 else
314 no += imax(0, pno + pdisks - vol->v_disks_count);
315 offset += strip_size;
316 }
317 }
318 remain -= length;
319 addr += length;
320 start = 0;
321 } while (remain > 0);
322 for (cbp = bioq_first(&queue); cbp != NULL;
323 cbp = bioq_first(&queue)) {
324 bioq_remove(&queue, cbp);
325 sd = cbp->bio_caller1;
326 cbp->bio_caller1 = NULL;
327 g_raid_subdisk_iostart(sd, cbp);
328 }
329 return;
330 failure:
331 for (cbp = bioq_first(&queue); cbp != NULL;
332 cbp = bioq_first(&queue)) {
333 bioq_remove(&queue, cbp);
334 g_destroy_bio(cbp);
335 }
336 if (bp->bio_error == 0)
337 bp->bio_error = ENOMEM;
338 g_raid_iodone(bp, bp->bio_error);
339 }
340
341 static void
342 g_raid_tr_iostart_raid5(struct g_raid_tr_object *tr, struct bio *bp)
343 {
344 struct g_raid_volume *vol;
345 struct g_raid_tr_raid5_object *trs;
346
347 vol = tr->tro_volume;
348 trs = (struct g_raid_tr_raid5_object *)tr;
349 if (vol->v_state < G_RAID_VOLUME_S_SUBOPTIMAL) {
350 g_raid_iodone(bp, EIO);
351 return;
352 }
353 switch (bp->bio_cmd) {
354 case BIO_READ:
355 g_raid_tr_iostart_raid5_read(tr, bp);
356 break;
357 case BIO_WRITE:
358 case BIO_DELETE:
359 case BIO_FLUSH:
360 g_raid_iodone(bp, ENODEV);
361 break;
362 default:
363 KASSERT(1 == 0, ("Invalid command here: %u (volume=%s)",
364 bp->bio_cmd, vol->v_name));
365 break;
366 }
367 }
368
369 static void
370 g_raid_tr_iodone_raid5(struct g_raid_tr_object *tr,
371 struct g_raid_subdisk *sd, struct bio *bp)
372 {
373 struct bio *pbp;
374 int error;
375
376 pbp = bp->bio_parent;
377 pbp->bio_inbed++;
378 error = bp->bio_error;
379 g_destroy_bio(bp);
380 if (pbp->bio_children == pbp->bio_inbed) {
381 pbp->bio_completed = pbp->bio_length;
382 g_raid_iodone(pbp, error);
383 }
384 }
385
386 static int
387 g_raid_tr_kerneldump_raid5(struct g_raid_tr_object *tr,
388 void *virtual, vm_offset_t physical, off_t offset, size_t length)
389 {
390
391 return (ENODEV);
392 }
393
394 static int
395 g_raid_tr_locked_raid5(struct g_raid_tr_object *tr, void *argp)
396 {
397 struct bio *bp;
398 struct g_raid_subdisk *sd;
399
400 bp = (struct bio *)argp;
401 sd = (struct g_raid_subdisk *)bp->bio_caller1;
402 g_raid_subdisk_iostart(sd, bp);
403
404 return (0);
405 }
406
407 static int
408 g_raid_tr_free_raid5(struct g_raid_tr_object *tr)
409 {
410 struct g_raid_tr_raid5_object *trs;
411
412 trs = (struct g_raid_tr_raid5_object *)tr;
413
414 if (trs->trso_buffer != NULL) {
415 free(trs->trso_buffer, M_TR_RAID5);
416 trs->trso_buffer = NULL;
417 }
418 return (0);
419 }
420
421 G_RAID_TR_DECLARE(raid5, "RAID5");
Cache object: dfbf3d8512b8f898b1ecf872d64ef43f
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