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NeilBrown9d09e662011-01-13 20:00:02 +00001/*
2 * Copyright (C) 2010-2011 Neil Brown
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02003 * Copyright (C) 2010-2015 Red Hat, Inc. All rights reserved.
NeilBrown9d09e662011-01-13 20:00:02 +00004 *
5 * This file is released under the GPL.
6 */
7
8#include <linux/slab.h>
Paul Gortmaker056075c2011-07-03 13:58:33 -04009#include <linux/module.h>
NeilBrown9d09e662011-01-13 20:00:02 +000010
11#include "md.h"
Jonathan Brassow32737272011-08-02 12:32:07 +010012#include "raid1.h"
NeilBrown9d09e662011-01-13 20:00:02 +000013#include "raid5.h"
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -050014#include "raid10.h"
NeilBrown9d09e662011-01-13 20:00:02 +000015#include "bitmap.h"
16
Alasdair G Kergon3e8dbb72011-08-02 12:32:03 +010017#include <linux/device-mapper.h>
18
NeilBrown9d09e662011-01-13 20:00:02 +000019#define DM_MSG_PREFIX "raid"
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +020020#define MAX_RAID_DEVICES 253 /* raid4/5/6 limit */
NeilBrown9d09e662011-01-13 20:00:02 +000021
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +020022static bool devices_handle_discard_safely = false;
23
NeilBrown9d09e662011-01-13 20:00:02 +000024/*
Jonathan Brassowb12d4372011-08-02 12:32:07 +010025 * The following flags are used by dm-raid.c to set up the array state.
26 * They must be cleared before md_run is called.
NeilBrown9d09e662011-01-13 20:00:02 +000027 */
Jonathan Brassowb12d4372011-08-02 12:32:07 +010028#define FirstUse 10 /* rdev flag */
NeilBrown9d09e662011-01-13 20:00:02 +000029
30struct raid_dev {
31 /*
32 * Two DM devices, one to hold metadata and one to hold the
33 * actual data/parity. The reason for this is to not confuse
34 * ti->len and give more flexibility in altering size and
35 * characteristics.
36 *
37 * While it is possible for this device to be associated
38 * with a different physical device than the data_dev, it
39 * is intended for it to be the same.
40 * |--------- Physical Device ---------|
41 * |- meta_dev -|------ data_dev ------|
42 */
43 struct dm_dev *meta_dev;
44 struct dm_dev *data_dev;
NeilBrown3cb03002011-10-11 16:45:26 +110045 struct md_rdev rdev;
NeilBrown9d09e662011-01-13 20:00:02 +000046};
47
48/*
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +020049 * Flags for rs->ctr_flags field.
NeilBrown9d09e662011-01-13 20:00:02 +000050 */
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +020051#define CTR_FLAG_SYNC 0x1
52#define CTR_FLAG_NOSYNC 0x2
53#define CTR_FLAG_REBUILD 0x4
54#define CTR_FLAG_DAEMON_SLEEP 0x8
55#define CTR_FLAG_MIN_RECOVERY_RATE 0x10
56#define CTR_FLAG_MAX_RECOVERY_RATE 0x20
57#define CTR_FLAG_MAX_WRITE_BEHIND 0x40
58#define CTR_FLAG_STRIPE_CACHE 0x80
59#define CTR_FLAG_REGION_SIZE 0x100
60#define CTR_FLAG_RAID10_COPIES 0x200
61#define CTR_FLAG_RAID10_FORMAT 0x400
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -050062
NeilBrown9d09e662011-01-13 20:00:02 +000063struct raid_set {
64 struct dm_target *ti;
65
Jonathan Brassow34f8ac6d2012-01-27 14:53:53 -060066 uint32_t bitmap_loaded;
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +020067 uint32_t ctr_flags;
NeilBrown9d09e662011-01-13 20:00:02 +000068
NeilBrownfd01b882011-10-11 16:47:53 +110069 struct mddev md;
NeilBrown9d09e662011-01-13 20:00:02 +000070 struct raid_type *raid_type;
71 struct dm_target_callbacks callbacks;
72
73 struct raid_dev dev[0];
74};
75
76/* Supported raid types and properties. */
77static struct raid_type {
78 const char *name; /* RAID algorithm. */
79 const char *descr; /* Descriptor text for logging. */
80 const unsigned parity_devs; /* # of parity devices. */
81 const unsigned minimal_devs; /* minimal # of devices in set. */
82 const unsigned level; /* RAID level. */
83 const unsigned algorithm; /* RAID algorithm. */
84} raid_types[] = {
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +020085 {"raid0", "RAID0 (striping)", 0, 2, 0, 0 /* NONE */},
Jonathan Brassow32737272011-08-02 12:32:07 +010086 {"raid1", "RAID1 (mirroring)", 0, 2, 1, 0 /* NONE */},
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -050087 {"raid10", "RAID10 (striped mirrors)", 0, 2, 10, UINT_MAX /* Varies */},
NeilBrown9d09e662011-01-13 20:00:02 +000088 {"raid4", "RAID4 (dedicated parity disk)", 1, 2, 5, ALGORITHM_PARITY_0},
89 {"raid5_la", "RAID5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
90 {"raid5_ra", "RAID5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
91 {"raid5_ls", "RAID5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
92 {"raid5_rs", "RAID5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
93 {"raid6_zr", "RAID6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
94 {"raid6_nr", "RAID6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
95 {"raid6_nc", "RAID6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE}
96};
97
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +110098static char *raid10_md_layout_to_format(int layout)
99{
100 /*
101 * Bit 16 and 17 stand for "offset" and "use_far_sets"
102 * Refer to MD's raid10.c for details
103 */
104 if ((layout & 0x10000) && (layout & 0x20000))
105 return "offset";
106
107 if ((layout & 0xFF) > 1)
108 return "near";
109
110 return "far";
111}
112
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500113static unsigned raid10_md_layout_to_copies(int layout)
114{
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100115 if ((layout & 0xFF) > 1)
116 return layout & 0xFF;
117 return (layout >> 8) & 0xFF;
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500118}
119
120static int raid10_format_to_md_layout(char *format, unsigned copies)
121{
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100122 unsigned n = 1, f = 1;
123
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200124 if (!strcasecmp("near", format))
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100125 n = copies;
126 else
127 f = copies;
128
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200129 if (!strcasecmp("offset", format))
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100130 return 0x30000 | (f << 8) | n;
131
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200132 if (!strcasecmp("far", format))
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100133 return 0x20000 | (f << 8) | n;
134
135 return (f << 8) | n;
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500136}
137
NeilBrown9d09e662011-01-13 20:00:02 +0000138static struct raid_type *get_raid_type(char *name)
139{
140 int i;
141
142 for (i = 0; i < ARRAY_SIZE(raid_types); i++)
143 if (!strcmp(raid_types[i].name, name))
144 return &raid_types[i];
145
146 return NULL;
147}
148
149static struct raid_set *context_alloc(struct dm_target *ti, struct raid_type *raid_type, unsigned raid_devs)
150{
151 unsigned i;
152 struct raid_set *rs;
NeilBrown9d09e662011-01-13 20:00:02 +0000153
154 if (raid_devs <= raid_type->parity_devs) {
155 ti->error = "Insufficient number of devices";
156 return ERR_PTR(-EINVAL);
157 }
158
NeilBrown9d09e662011-01-13 20:00:02 +0000159 rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
160 if (!rs) {
161 ti->error = "Cannot allocate raid context";
162 return ERR_PTR(-ENOMEM);
163 }
164
165 mddev_init(&rs->md);
166
167 rs->ti = ti;
168 rs->raid_type = raid_type;
169 rs->md.raid_disks = raid_devs;
170 rs->md.level = raid_type->level;
171 rs->md.new_level = rs->md.level;
NeilBrown9d09e662011-01-13 20:00:02 +0000172 rs->md.layout = raid_type->algorithm;
173 rs->md.new_layout = rs->md.layout;
174 rs->md.delta_disks = 0;
175 rs->md.recovery_cp = 0;
176
177 for (i = 0; i < raid_devs; i++)
178 md_rdev_init(&rs->dev[i].rdev);
179
180 /*
181 * Remaining items to be initialized by further RAID params:
182 * rs->md.persistent
183 * rs->md.external
184 * rs->md.chunk_sectors
185 * rs->md.new_chunk_sectors
Jonathan E Brassowc039c332012-07-27 15:08:04 +0100186 * rs->md.dev_sectors
NeilBrown9d09e662011-01-13 20:00:02 +0000187 */
188
189 return rs;
190}
191
192static void context_free(struct raid_set *rs)
193{
194 int i;
195
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100196 for (i = 0; i < rs->md.raid_disks; i++) {
197 if (rs->dev[i].meta_dev)
198 dm_put_device(rs->ti, rs->dev[i].meta_dev);
NeilBrown545c8792012-05-22 13:54:30 +1000199 md_rdev_clear(&rs->dev[i].rdev);
NeilBrown9d09e662011-01-13 20:00:02 +0000200 if (rs->dev[i].data_dev)
201 dm_put_device(rs->ti, rs->dev[i].data_dev);
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100202 }
NeilBrown9d09e662011-01-13 20:00:02 +0000203
204 kfree(rs);
205}
206
207/*
208 * For every device we have two words
209 * <meta_dev>: meta device name or '-' if missing
210 * <data_dev>: data device name or '-' if missing
211 *
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100212 * The following are permitted:
213 * - -
214 * - <data_dev>
215 * <meta_dev> <data_dev>
216 *
217 * The following is not allowed:
218 * <meta_dev> -
219 *
220 * This code parses those words. If there is a failure,
221 * the caller must use context_free to unwind the operations.
NeilBrown9d09e662011-01-13 20:00:02 +0000222 */
223static int dev_parms(struct raid_set *rs, char **argv)
224{
225 int i;
226 int rebuild = 0;
227 int metadata_available = 0;
228 int ret = 0;
229
230 for (i = 0; i < rs->md.raid_disks; i++, argv += 2) {
231 rs->dev[i].rdev.raid_disk = i;
232
233 rs->dev[i].meta_dev = NULL;
234 rs->dev[i].data_dev = NULL;
235
236 /*
237 * There are no offsets, since there is a separate device
238 * for data and metadata.
239 */
240 rs->dev[i].rdev.data_offset = 0;
241 rs->dev[i].rdev.mddev = &rs->md;
242
243 if (strcmp(argv[0], "-")) {
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100244 ret = dm_get_device(rs->ti, argv[0],
245 dm_table_get_mode(rs->ti->table),
246 &rs->dev[i].meta_dev);
247 rs->ti->error = "RAID metadata device lookup failure";
248 if (ret)
249 return ret;
250
251 rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
252 if (!rs->dev[i].rdev.sb_page)
253 return -ENOMEM;
NeilBrown9d09e662011-01-13 20:00:02 +0000254 }
255
256 if (!strcmp(argv[1], "-")) {
257 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
258 (!rs->dev[i].rdev.recovery_offset)) {
259 rs->ti->error = "Drive designated for rebuild not specified";
260 return -EINVAL;
261 }
262
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100263 rs->ti->error = "No data device supplied with metadata device";
264 if (rs->dev[i].meta_dev)
265 return -EINVAL;
266
NeilBrown9d09e662011-01-13 20:00:02 +0000267 continue;
268 }
269
270 ret = dm_get_device(rs->ti, argv[1],
271 dm_table_get_mode(rs->ti->table),
272 &rs->dev[i].data_dev);
273 if (ret) {
274 rs->ti->error = "RAID device lookup failure";
275 return ret;
276 }
277
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100278 if (rs->dev[i].meta_dev) {
279 metadata_available = 1;
280 rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
281 }
NeilBrown9d09e662011-01-13 20:00:02 +0000282 rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
283 list_add(&rs->dev[i].rdev.same_set, &rs->md.disks);
284 if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
285 rebuild++;
286 }
287
288 if (metadata_available) {
289 rs->md.external = 0;
290 rs->md.persistent = 1;
291 rs->md.major_version = 2;
292 } else if (rebuild && !rs->md.recovery_cp) {
293 /*
294 * Without metadata, we will not be able to tell if the array
295 * is in-sync or not - we must assume it is not. Therefore,
296 * it is impossible to rebuild a drive.
297 *
298 * Even if there is metadata, the on-disk information may
299 * indicate that the array is not in-sync and it will then
300 * fail at that time.
301 *
302 * User could specify 'nosync' option if desperate.
303 */
304 DMERR("Unable to rebuild drive while array is not in-sync");
305 rs->ti->error = "RAID device lookup failure";
306 return -EINVAL;
307 }
308
309 return 0;
310}
311
312/*
Jonathan Brassowc1084562011-08-02 12:32:07 +0100313 * validate_region_size
314 * @rs
315 * @region_size: region size in sectors. If 0, pick a size (4MiB default).
316 *
317 * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
318 * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
319 *
320 * Returns: 0 on success, -EINVAL on failure.
321 */
322static int validate_region_size(struct raid_set *rs, unsigned long region_size)
323{
324 unsigned long min_region_size = rs->ti->len / (1 << 21);
325
326 if (!region_size) {
327 /*
328 * Choose a reasonable default. All figures in sectors.
329 */
330 if (min_region_size > (1 << 13)) {
Jonathan Brassow3a0f9aa2012-12-21 20:23:33 +0000331 /* If not a power of 2, make it the next power of 2 */
Mikulas Patocka042745e2015-10-02 11:17:37 -0400332 region_size = roundup_pow_of_two(min_region_size);
Jonathan Brassowc1084562011-08-02 12:32:07 +0100333 DMINFO("Choosing default region size of %lu sectors",
334 region_size);
Jonathan Brassowc1084562011-08-02 12:32:07 +0100335 } else {
336 DMINFO("Choosing default region size of 4MiB");
337 region_size = 1 << 13; /* sectors */
338 }
339 } else {
340 /*
341 * Validate user-supplied value.
342 */
343 if (region_size > rs->ti->len) {
344 rs->ti->error = "Supplied region size is too large";
345 return -EINVAL;
346 }
347
348 if (region_size < min_region_size) {
349 DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
350 region_size, min_region_size);
351 rs->ti->error = "Supplied region size is too small";
352 return -EINVAL;
353 }
354
355 if (!is_power_of_2(region_size)) {
356 rs->ti->error = "Region size is not a power of 2";
357 return -EINVAL;
358 }
359
360 if (region_size < rs->md.chunk_sectors) {
361 rs->ti->error = "Region size is smaller than the chunk size";
362 return -EINVAL;
363 }
364 }
365
366 /*
367 * Convert sectors to bytes.
368 */
369 rs->md.bitmap_info.chunksize = (region_size << 9);
370
371 return 0;
372}
373
374/*
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600375 * validate_raid_redundancy
Jonathan Brassoweb649122012-10-11 13:40:09 +1100376 * @rs
377 *
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600378 * Determine if there are enough devices in the array that haven't
379 * failed (or are being rebuilt) to form a usable array.
Jonathan Brassoweb649122012-10-11 13:40:09 +1100380 *
381 * Returns: 0 on success, -EINVAL on failure.
382 */
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600383static int validate_raid_redundancy(struct raid_set *rs)
Jonathan Brassoweb649122012-10-11 13:40:09 +1100384{
385 unsigned i, rebuild_cnt = 0;
NeilBrown3f6bbd32013-05-09 10:27:49 +1000386 unsigned rebuilds_per_group = 0, copies, d;
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100387 unsigned group_size, last_group_start;
Jonathan Brassoweb649122012-10-11 13:40:09 +1100388
Jonathan Brassoweb649122012-10-11 13:40:09 +1100389 for (i = 0; i < rs->md.raid_disks; i++)
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600390 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
391 !rs->dev[i].rdev.sb_page)
Jonathan Brassoweb649122012-10-11 13:40:09 +1100392 rebuild_cnt++;
393
394 switch (rs->raid_type->level) {
395 case 1:
396 if (rebuild_cnt >= rs->md.raid_disks)
397 goto too_many;
398 break;
399 case 4:
400 case 5:
401 case 6:
402 if (rebuild_cnt > rs->raid_type->parity_devs)
403 goto too_many;
404 break;
405 case 10:
Jonathan Brassow4ec1e362012-10-11 13:40:24 +1100406 copies = raid10_md_layout_to_copies(rs->md.layout);
407 if (rebuild_cnt < copies)
408 break;
409
410 /*
411 * It is possible to have a higher rebuild count for RAID10,
412 * as long as the failed devices occur in different mirror
413 * groups (i.e. different stripes).
414 *
Jonathan Brassow4ec1e362012-10-11 13:40:24 +1100415 * When checking "near" format, make sure no adjacent devices
416 * have failed beyond what can be handled. In addition to the
417 * simple case where the number of devices is a multiple of the
418 * number of copies, we must also handle cases where the number
419 * of devices is not a multiple of the number of copies.
420 * E.g. dev1 dev2 dev3 dev4 dev5
421 * A A B B C
422 * C D D E E
423 */
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100424 if (!strcmp("near", raid10_md_layout_to_format(rs->md.layout))) {
425 for (i = 0; i < rs->md.raid_disks * copies; i++) {
426 if (!(i % copies))
427 rebuilds_per_group = 0;
428 d = i % rs->md.raid_disks;
429 if ((!rs->dev[d].rdev.sb_page ||
430 !test_bit(In_sync, &rs->dev[d].rdev.flags)) &&
431 (++rebuilds_per_group >= copies))
432 goto too_many;
433 }
434 break;
435 }
436
437 /*
438 * When checking "far" and "offset" formats, we need to ensure
439 * that the device that holds its copy is not also dead or
440 * being rebuilt. (Note that "far" and "offset" formats only
441 * support two copies right now. These formats also only ever
442 * use the 'use_far_sets' variant.)
443 *
444 * This check is somewhat complicated by the need to account
445 * for arrays that are not a multiple of (far) copies. This
446 * results in the need to treat the last (potentially larger)
447 * set differently.
448 */
449 group_size = (rs->md.raid_disks / copies);
450 last_group_start = (rs->md.raid_disks / group_size) - 1;
451 last_group_start *= group_size;
452 for (i = 0; i < rs->md.raid_disks; i++) {
453 if (!(i % copies) && !(i > last_group_start))
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600454 rebuilds_per_group = 0;
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100455 if ((!rs->dev[i].rdev.sb_page ||
456 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
Jonathan Brassow4ec1e362012-10-11 13:40:24 +1100457 (++rebuilds_per_group >= copies))
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100458 goto too_many;
Jonathan Brassow4ec1e362012-10-11 13:40:24 +1100459 }
460 break;
Jonathan Brassoweb649122012-10-11 13:40:09 +1100461 default:
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600462 if (rebuild_cnt)
463 return -EINVAL;
Jonathan Brassoweb649122012-10-11 13:40:09 +1100464 }
465
466 return 0;
467
468too_many:
Jonathan Brassoweb649122012-10-11 13:40:09 +1100469 return -EINVAL;
470}
471
472/*
NeilBrown9d09e662011-01-13 20:00:02 +0000473 * Possible arguments are...
NeilBrown9d09e662011-01-13 20:00:02 +0000474 * <chunk_size> [optional_args]
475 *
Jonathan Brassow32737272011-08-02 12:32:07 +0100476 * Argument definitions
477 * <chunk_size> The number of sectors per disk that
478 * will form the "stripe"
479 * [[no]sync] Force or prevent recovery of the
480 * entire array
NeilBrown9d09e662011-01-13 20:00:02 +0000481 * [rebuild <idx>] Rebuild the drive indicated by the index
Jonathan Brassow32737272011-08-02 12:32:07 +0100482 * [daemon_sleep <ms>] Time between bitmap daemon work to
483 * clear bits
NeilBrown9d09e662011-01-13 20:00:02 +0000484 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
485 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
Jonathan Brassow46bed2b2011-08-02 12:32:07 +0100486 * [write_mostly <idx>] Indicate a write mostly drive via index
NeilBrown9d09e662011-01-13 20:00:02 +0000487 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
488 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
Jonathan Brassowc1084562011-08-02 12:32:07 +0100489 * [region_size <sectors>] Defines granularity of bitmap
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500490 *
491 * RAID10-only options:
492 * [raid10_copies <# copies>] Number of copies. (Default: 2)
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100493 * [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
NeilBrown9d09e662011-01-13 20:00:02 +0000494 */
495static int parse_raid_params(struct raid_set *rs, char **argv,
496 unsigned num_raid_params)
497{
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500498 char *raid10_format = "near";
499 unsigned raid10_copies = 2;
Jonathan Brassoweb649122012-10-11 13:40:09 +1100500 unsigned i;
Jonathan Brassowc1084562011-08-02 12:32:07 +0100501 unsigned long value, region_size = 0;
Jonathan E Brassowc039c332012-07-27 15:08:04 +0100502 sector_t sectors_per_dev = rs->ti->len;
Mike Snitzer542f9032012-07-27 15:08:00 +0100503 sector_t max_io_len;
NeilBrown9d09e662011-01-13 20:00:02 +0000504 char *key;
505
506 /*
507 * First, parse the in-order required arguments
Jonathan Brassow32737272011-08-02 12:32:07 +0100508 * "chunk_size" is the only argument of this type.
NeilBrown9d09e662011-01-13 20:00:02 +0000509 */
Jingoo Hanb29bebd2013-06-01 16:15:16 +0900510 if ((kstrtoul(argv[0], 10, &value) < 0)) {
NeilBrown9d09e662011-01-13 20:00:02 +0000511 rs->ti->error = "Bad chunk size";
512 return -EINVAL;
Jonathan Brassow32737272011-08-02 12:32:07 +0100513 } else if (rs->raid_type->level == 1) {
514 if (value)
515 DMERR("Ignoring chunk size parameter for RAID 1");
516 value = 0;
517 } else if (!is_power_of_2(value)) {
518 rs->ti->error = "Chunk size must be a power of 2";
519 return -EINVAL;
520 } else if (value < 8) {
521 rs->ti->error = "Chunk size value is too small";
522 return -EINVAL;
NeilBrown9d09e662011-01-13 20:00:02 +0000523 }
524
525 rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
526 argv++;
527 num_raid_params--;
528
529 /*
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100530 * We set each individual device as In_sync with a completed
531 * 'recovery_offset'. If there has been a device failure or
532 * replacement then one of the following cases applies:
533 *
534 * 1) User specifies 'rebuild'.
535 * - Device is reset when param is read.
536 * 2) A new device is supplied.
537 * - No matching superblock found, resets device.
538 * 3) Device failure was transient and returns on reload.
539 * - Failure noticed, resets device for bitmap replay.
540 * 4) Device hadn't completed recovery after previous failure.
541 * - Superblock is read and overrides recovery_offset.
542 *
543 * What is found in the superblocks of the devices is always
544 * authoritative, unless 'rebuild' or '[no]sync' was specified.
545 */
546 for (i = 0; i < rs->md.raid_disks; i++) {
547 set_bit(In_sync, &rs->dev[i].rdev.flags);
548 rs->dev[i].rdev.recovery_offset = MaxSector;
549 }
550
551 /*
NeilBrown9d09e662011-01-13 20:00:02 +0000552 * Second, parse the unordered optional arguments
553 */
NeilBrown9d09e662011-01-13 20:00:02 +0000554 for (i = 0; i < num_raid_params; i++) {
Jonathan Brassow13c87582011-08-02 12:32:03 +0100555 if (!strcasecmp(argv[i], "nosync")) {
NeilBrown9d09e662011-01-13 20:00:02 +0000556 rs->md.recovery_cp = MaxSector;
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200557 rs->ctr_flags |= CTR_FLAG_NOSYNC;
NeilBrown9d09e662011-01-13 20:00:02 +0000558 continue;
559 }
Jonathan Brassow13c87582011-08-02 12:32:03 +0100560 if (!strcasecmp(argv[i], "sync")) {
NeilBrown9d09e662011-01-13 20:00:02 +0000561 rs->md.recovery_cp = 0;
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200562 rs->ctr_flags |= CTR_FLAG_SYNC;
NeilBrown9d09e662011-01-13 20:00:02 +0000563 continue;
564 }
565
566 /* The rest of the optional arguments come in key/value pairs */
567 if ((i + 1) >= num_raid_params) {
568 rs->ti->error = "Wrong number of raid parameters given";
569 return -EINVAL;
570 }
571
572 key = argv[i++];
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500573
574 /* Parameters that take a string value are checked here. */
575 if (!strcasecmp(key, "raid10_format")) {
576 if (rs->raid_type->level != 10) {
577 rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
578 return -EINVAL;
579 }
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100580 if (strcmp("near", argv[i]) &&
581 strcmp("far", argv[i]) &&
582 strcmp("offset", argv[i])) {
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500583 rs->ti->error = "Invalid 'raid10_format' value given";
584 return -EINVAL;
585 }
586 raid10_format = argv[i];
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200587 rs->ctr_flags |= CTR_FLAG_RAID10_FORMAT;
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500588 continue;
589 }
590
Jingoo Hanb29bebd2013-06-01 16:15:16 +0900591 if (kstrtoul(argv[i], 10, &value) < 0) {
NeilBrown9d09e662011-01-13 20:00:02 +0000592 rs->ti->error = "Bad numerical argument given in raid params";
593 return -EINVAL;
594 }
595
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500596 /* Parameters that take a numeric value are checked here */
Jonathan Brassow13c87582011-08-02 12:32:03 +0100597 if (!strcasecmp(key, "rebuild")) {
Jonathan Brassow73861992012-10-11 13:40:36 +1100598 if (value >= rs->md.raid_disks) {
NeilBrown9d09e662011-01-13 20:00:02 +0000599 rs->ti->error = "Invalid rebuild index given";
600 return -EINVAL;
601 }
602 clear_bit(In_sync, &rs->dev[value].rdev.flags);
603 rs->dev[value].rdev.recovery_offset = 0;
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200604 rs->ctr_flags |= CTR_FLAG_REBUILD;
Jonathan Brassow46bed2b2011-08-02 12:32:07 +0100605 } else if (!strcasecmp(key, "write_mostly")) {
606 if (rs->raid_type->level != 1) {
607 rs->ti->error = "write_mostly option is only valid for RAID1";
608 return -EINVAL;
609 }
Jonthan Brassow82324802011-09-25 23:26:19 +0100610 if (value >= rs->md.raid_disks) {
Jonathan Brassow46bed2b2011-08-02 12:32:07 +0100611 rs->ti->error = "Invalid write_mostly drive index given";
612 return -EINVAL;
613 }
614 set_bit(WriteMostly, &rs->dev[value].rdev.flags);
Jonathan Brassow13c87582011-08-02 12:32:03 +0100615 } else if (!strcasecmp(key, "max_write_behind")) {
Jonathan Brassow46bed2b2011-08-02 12:32:07 +0100616 if (rs->raid_type->level != 1) {
617 rs->ti->error = "max_write_behind option is only valid for RAID1";
618 return -EINVAL;
619 }
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200620 rs->ctr_flags |= CTR_FLAG_MAX_WRITE_BEHIND;
NeilBrown9d09e662011-01-13 20:00:02 +0000621
622 /*
623 * In device-mapper, we specify things in sectors, but
624 * MD records this value in kB
625 */
626 value /= 2;
627 if (value > COUNTER_MAX) {
628 rs->ti->error = "Max write-behind limit out of range";
629 return -EINVAL;
630 }
631 rs->md.bitmap_info.max_write_behind = value;
Jonathan Brassow13c87582011-08-02 12:32:03 +0100632 } else if (!strcasecmp(key, "daemon_sleep")) {
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200633 rs->ctr_flags |= CTR_FLAG_DAEMON_SLEEP;
NeilBrown9d09e662011-01-13 20:00:02 +0000634 if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
635 rs->ti->error = "daemon sleep period out of range";
636 return -EINVAL;
637 }
638 rs->md.bitmap_info.daemon_sleep = value;
Jonathan Brassow13c87582011-08-02 12:32:03 +0100639 } else if (!strcasecmp(key, "stripe_cache")) {
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200640 rs->ctr_flags |= CTR_FLAG_STRIPE_CACHE;
NeilBrown9d09e662011-01-13 20:00:02 +0000641
642 /*
643 * In device-mapper, we specify things in sectors, but
644 * MD records this value in kB
645 */
646 value /= 2;
647
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500648 if ((rs->raid_type->level != 5) &&
649 (rs->raid_type->level != 6)) {
NeilBrown9d09e662011-01-13 20:00:02 +0000650 rs->ti->error = "Inappropriate argument: stripe_cache";
651 return -EINVAL;
652 }
653 if (raid5_set_cache_size(&rs->md, (int)value)) {
654 rs->ti->error = "Bad stripe_cache size";
655 return -EINVAL;
656 }
Jonathan Brassow13c87582011-08-02 12:32:03 +0100657 } else if (!strcasecmp(key, "min_recovery_rate")) {
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200658 rs->ctr_flags |= CTR_FLAG_MIN_RECOVERY_RATE;
NeilBrown9d09e662011-01-13 20:00:02 +0000659 if (value > INT_MAX) {
660 rs->ti->error = "min_recovery_rate out of range";
661 return -EINVAL;
662 }
663 rs->md.sync_speed_min = (int)value;
Jonathan Brassow13c87582011-08-02 12:32:03 +0100664 } else if (!strcasecmp(key, "max_recovery_rate")) {
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200665 rs->ctr_flags |= CTR_FLAG_MAX_RECOVERY_RATE;
NeilBrown9d09e662011-01-13 20:00:02 +0000666 if (value > INT_MAX) {
667 rs->ti->error = "max_recovery_rate out of range";
668 return -EINVAL;
669 }
670 rs->md.sync_speed_max = (int)value;
Jonathan Brassowc1084562011-08-02 12:32:07 +0100671 } else if (!strcasecmp(key, "region_size")) {
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200672 rs->ctr_flags |= CTR_FLAG_REGION_SIZE;
Jonathan Brassowc1084562011-08-02 12:32:07 +0100673 region_size = value;
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500674 } else if (!strcasecmp(key, "raid10_copies") &&
675 (rs->raid_type->level == 10)) {
676 if ((value < 2) || (value > 0xFF)) {
677 rs->ti->error = "Bad value for 'raid10_copies'";
678 return -EINVAL;
679 }
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200680 rs->ctr_flags |= CTR_FLAG_RAID10_COPIES;
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500681 raid10_copies = value;
NeilBrown9d09e662011-01-13 20:00:02 +0000682 } else {
683 DMERR("Unable to parse RAID parameter: %s", key);
684 rs->ti->error = "Unable to parse RAID parameters";
685 return -EINVAL;
686 }
687 }
688
Jonathan Brassowc1084562011-08-02 12:32:07 +0100689 if (validate_region_size(rs, region_size))
690 return -EINVAL;
691
692 if (rs->md.chunk_sectors)
Mike Snitzer542f9032012-07-27 15:08:00 +0100693 max_io_len = rs->md.chunk_sectors;
Jonathan Brassowc1084562011-08-02 12:32:07 +0100694 else
Mike Snitzer542f9032012-07-27 15:08:00 +0100695 max_io_len = region_size;
Jonathan Brassowc1084562011-08-02 12:32:07 +0100696
Mike Snitzer542f9032012-07-27 15:08:00 +0100697 if (dm_set_target_max_io_len(rs->ti, max_io_len))
698 return -EINVAL;
Jonathan Brassow32737272011-08-02 12:32:07 +0100699
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500700 if (rs->raid_type->level == 10) {
701 if (raid10_copies > rs->md.raid_disks) {
702 rs->ti->error = "Not enough devices to satisfy specification";
703 return -EINVAL;
704 }
705
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100706 /*
707 * If the format is not "near", we only support
708 * two copies at the moment.
709 */
710 if (strcmp("near", raid10_format) && (raid10_copies > 2)) {
711 rs->ti->error = "Too many copies for given RAID10 format.";
712 return -EINVAL;
713 }
714
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500715 /* (Len * #mirrors) / #devices */
716 sectors_per_dev = rs->ti->len * raid10_copies;
717 sector_div(sectors_per_dev, rs->md.raid_disks);
718
719 rs->md.layout = raid10_format_to_md_layout(raid10_format,
720 raid10_copies);
721 rs->md.new_layout = rs->md.layout;
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +0200722 } else if ((!rs->raid_type->level || rs->raid_type->level > 1) &&
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500723 sector_div(sectors_per_dev,
724 (rs->md.raid_disks - rs->raid_type->parity_devs))) {
Jonathan E Brassowc039c332012-07-27 15:08:04 +0100725 rs->ti->error = "Target length not divisible by number of data devices";
726 return -EINVAL;
727 }
728 rs->md.dev_sectors = sectors_per_dev;
729
NeilBrown9d09e662011-01-13 20:00:02 +0000730 /* Assume there are no metadata devices until the drives are parsed */
731 rs->md.persistent = 0;
732 rs->md.external = 1;
733
734 return 0;
735}
736
737static void do_table_event(struct work_struct *ws)
738{
739 struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
740
741 dm_table_event(rs->ti->table);
742}
743
744static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
745{
746 struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
747
NeilBrown5c675f82014-12-15 12:56:56 +1100748 return mddev_congested(&rs->md, bits);
NeilBrown9d09e662011-01-13 20:00:02 +0000749}
750
NeilBrown9d09e662011-01-13 20:00:02 +0000751/*
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100752 * This structure is never routinely used by userspace, unlike md superblocks.
753 * Devices with this superblock should only ever be accessed via device-mapper.
754 */
755#define DM_RAID_MAGIC 0x64526D44
756struct dm_raid_superblock {
757 __le32 magic; /* "DmRd" */
758 __le32 features; /* Used to indicate possible future changes */
759
760 __le32 num_devices; /* Number of devices in this array. (Max 64) */
761 __le32 array_position; /* The position of this drive in the array */
762
763 __le64 events; /* Incremented by md when superblock updated */
764 __le64 failed_devices; /* Bit field of devices to indicate failures */
765
766 /*
767 * This offset tracks the progress of the repair or replacement of
768 * an individual drive.
769 */
770 __le64 disk_recovery_offset;
771
772 /*
773 * This offset tracks the progress of the initial array
774 * synchronisation/parity calculation.
775 */
776 __le64 array_resync_offset;
777
778 /*
779 * RAID characteristics
780 */
781 __le32 level;
782 __le32 layout;
783 __le32 stripe_sectors;
784
Heinz Mauelshagen40d43c42014-10-17 13:38:50 +0200785 /* Remainder of a logical block is zero-filled when writing (see super_sync()). */
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100786} __packed;
787
NeilBrown3cb03002011-10-11 16:45:26 +1100788static int read_disk_sb(struct md_rdev *rdev, int size)
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100789{
790 BUG_ON(!rdev->sb_page);
791
792 if (rdev->sb_loaded)
793 return 0;
794
795 if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, 1)) {
Jonathan E Brassow04475682012-03-28 18:41:26 +0100796 DMERR("Failed to read superblock of device at position %d",
797 rdev->raid_disk);
Jonathan Brassowc32fb9e2012-05-22 13:55:31 +1000798 md_error(rdev->mddev, rdev);
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100799 return -EINVAL;
800 }
801
802 rdev->sb_loaded = 1;
803
804 return 0;
805}
806
NeilBrownfd01b882011-10-11 16:47:53 +1100807static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100808{
Jonathan Brassow81f382f2012-05-22 13:55:30 +1000809 int i;
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100810 uint64_t failed_devices;
811 struct dm_raid_superblock *sb;
Jonathan Brassow81f382f2012-05-22 13:55:30 +1000812 struct raid_set *rs = container_of(mddev, struct raid_set, md);
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100813
814 sb = page_address(rdev->sb_page);
815 failed_devices = le64_to_cpu(sb->failed_devices);
816
Jonathan Brassow81f382f2012-05-22 13:55:30 +1000817 for (i = 0; i < mddev->raid_disks; i++)
818 if (!rs->dev[i].data_dev ||
819 test_bit(Faulty, &(rs->dev[i].rdev.flags)))
820 failed_devices |= (1ULL << i);
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100821
Heinz Mauelshagen40d43c42014-10-17 13:38:50 +0200822 memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100823
824 sb->magic = cpu_to_le32(DM_RAID_MAGIC);
825 sb->features = cpu_to_le32(0); /* No features yet */
826
827 sb->num_devices = cpu_to_le32(mddev->raid_disks);
828 sb->array_position = cpu_to_le32(rdev->raid_disk);
829
830 sb->events = cpu_to_le64(mddev->events);
831 sb->failed_devices = cpu_to_le64(failed_devices);
832
833 sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
834 sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
835
836 sb->level = cpu_to_le32(mddev->level);
837 sb->layout = cpu_to_le32(mddev->layout);
838 sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
839}
840
841/*
842 * super_load
843 *
844 * This function creates a superblock if one is not found on the device
845 * and will decide which superblock to use if there's a choice.
846 *
847 * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
848 */
NeilBrown3cb03002011-10-11 16:45:26 +1100849static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100850{
851 int ret;
852 struct dm_raid_superblock *sb;
853 struct dm_raid_superblock *refsb;
854 uint64_t events_sb, events_refsb;
855
856 rdev->sb_start = 0;
Heinz Mauelshagen40d43c42014-10-17 13:38:50 +0200857 rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
858 if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) {
859 DMERR("superblock size of a logical block is no longer valid");
860 return -EINVAL;
861 }
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100862
863 ret = read_disk_sb(rdev, rdev->sb_size);
864 if (ret)
865 return ret;
866
867 sb = page_address(rdev->sb_page);
Jonathan E Brassow3aa3b2b2012-03-07 19:09:47 +0000868
869 /*
870 * Two cases that we want to write new superblocks and rebuild:
871 * 1) New device (no matching magic number)
872 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
873 */
874 if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
875 (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100876 super_sync(rdev->mddev, rdev);
877
878 set_bit(FirstUse, &rdev->flags);
879
880 /* Force writing of superblocks to disk */
881 set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags);
882
883 /* Any superblock is better than none, choose that if given */
884 return refdev ? 0 : 1;
885 }
886
887 if (!refdev)
888 return 1;
889
890 events_sb = le64_to_cpu(sb->events);
891
892 refsb = page_address(refdev->sb_page);
893 events_refsb = le64_to_cpu(refsb->events);
894
895 return (events_sb > events_refsb) ? 1 : 0;
896}
897
NeilBrownfd01b882011-10-11 16:47:53 +1100898static int super_init_validation(struct mddev *mddev, struct md_rdev *rdev)
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100899{
900 int role;
901 struct raid_set *rs = container_of(mddev, struct raid_set, md);
902 uint64_t events_sb;
903 uint64_t failed_devices;
904 struct dm_raid_superblock *sb;
905 uint32_t new_devs = 0;
906 uint32_t rebuilds = 0;
NeilBrowndafb20f2012-03-19 12:46:39 +1100907 struct md_rdev *r;
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100908 struct dm_raid_superblock *sb2;
909
910 sb = page_address(rdev->sb_page);
911 events_sb = le64_to_cpu(sb->events);
912 failed_devices = le64_to_cpu(sb->failed_devices);
913
914 /*
915 * Initialise to 1 if this is a new superblock.
916 */
917 mddev->events = events_sb ? : 1;
918
919 /*
920 * Reshaping is not currently allowed
921 */
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100922 if (le32_to_cpu(sb->level) != mddev->level) {
923 DMERR("Reshaping arrays not yet supported. (RAID level change)");
924 return -EINVAL;
925 }
926 if (le32_to_cpu(sb->layout) != mddev->layout) {
927 DMERR("Reshaping arrays not yet supported. (RAID layout change)");
928 DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout);
929 DMERR(" Old layout: %s w/ %d copies",
930 raid10_md_layout_to_format(le32_to_cpu(sb->layout)),
931 raid10_md_layout_to_copies(le32_to_cpu(sb->layout)));
932 DMERR(" New layout: %s w/ %d copies",
933 raid10_md_layout_to_format(mddev->layout),
934 raid10_md_layout_to_copies(mddev->layout));
935 return -EINVAL;
936 }
937 if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) {
938 DMERR("Reshaping arrays not yet supported. (stripe sectors change)");
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100939 return -EINVAL;
940 }
941
942 /* We can only change the number of devices in RAID1 right now */
943 if ((rs->raid_type->level != 1) &&
944 (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) {
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100945 DMERR("Reshaping arrays not yet supported. (device count change)");
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100946 return -EINVAL;
947 }
948
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +0200949 if (!(rs->ctr_flags & (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)))
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100950 mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
951
952 /*
953 * During load, we set FirstUse if a new superblock was written.
954 * There are two reasons we might not have a superblock:
955 * 1) The array is brand new - in which case, all of the
956 * devices must have their In_sync bit set. Also,
957 * recovery_cp must be 0, unless forced.
958 * 2) This is a new device being added to an old array
959 * and the new device needs to be rebuilt - in which
960 * case the In_sync bit will /not/ be set and
961 * recovery_cp must be MaxSector.
962 */
NeilBrowndafb20f2012-03-19 12:46:39 +1100963 rdev_for_each(r, mddev) {
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100964 if (!test_bit(In_sync, &r->flags)) {
Jonathan E Brassow3aa3b2b2012-03-07 19:09:47 +0000965 DMINFO("Device %d specified for rebuild: "
966 "Clearing superblock", r->raid_disk);
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100967 rebuilds++;
968 } else if (test_bit(FirstUse, &r->flags))
969 new_devs++;
970 }
971
972 if (!rebuilds) {
973 if (new_devs == mddev->raid_disks) {
974 DMINFO("Superblocks created for new array");
975 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
976 } else if (new_devs) {
977 DMERR("New device injected "
978 "into existing array without 'rebuild' "
979 "parameter specified");
980 return -EINVAL;
981 }
982 } else if (new_devs) {
983 DMERR("'rebuild' devices cannot be "
984 "injected into an array with other first-time devices");
985 return -EINVAL;
986 } else if (mddev->recovery_cp != MaxSector) {
987 DMERR("'rebuild' specified while array is not in-sync");
988 return -EINVAL;
989 }
990
991 /*
992 * Now we set the Faulty bit for those devices that are
993 * recorded in the superblock as failed.
994 */
NeilBrowndafb20f2012-03-19 12:46:39 +1100995 rdev_for_each(r, mddev) {
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100996 if (!r->sb_page)
997 continue;
998 sb2 = page_address(r->sb_page);
999 sb2->failed_devices = 0;
1000
1001 /*
1002 * Check for any device re-ordering.
1003 */
1004 if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
1005 role = le32_to_cpu(sb2->array_position);
1006 if (role != r->raid_disk) {
1007 if (rs->raid_type->level != 1) {
1008 rs->ti->error = "Cannot change device "
1009 "positions in RAID array";
1010 return -EINVAL;
1011 }
1012 DMINFO("RAID1 device #%d now at position #%d",
1013 role, r->raid_disk);
1014 }
1015
1016 /*
1017 * Partial recovery is performed on
1018 * returning failed devices.
1019 */
1020 if (failed_devices & (1 << role))
1021 set_bit(Faulty, &r->flags);
1022 }
1023 }
1024
1025 return 0;
1026}
1027
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001028static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001029{
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001030 struct mddev *mddev = &rs->md;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001031 struct dm_raid_superblock *sb = page_address(rdev->sb_page);
1032
1033 /*
1034 * If mddev->events is not set, we know we have not yet initialized
1035 * the array.
1036 */
1037 if (!mddev->events && super_init_validation(mddev, rdev))
1038 return -EINVAL;
1039
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001040 /* Enable bitmap creation for RAID levels != 0 */
1041 mddev->bitmap_info.offset = (rs->raid_type->level) ? to_sector(4096) : 0;
1042 rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
1043
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001044 if (!test_bit(FirstUse, &rdev->flags)) {
1045 rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
1046 if (rdev->recovery_offset != MaxSector)
1047 clear_bit(In_sync, &rdev->flags);
1048 }
1049
1050 /*
1051 * If a device comes back, set it as not In_sync and no longer faulty.
1052 */
1053 if (test_bit(Faulty, &rdev->flags)) {
1054 clear_bit(Faulty, &rdev->flags);
1055 clear_bit(In_sync, &rdev->flags);
1056 rdev->saved_raid_disk = rdev->raid_disk;
1057 rdev->recovery_offset = 0;
1058 }
1059
1060 clear_bit(FirstUse, &rdev->flags);
1061
1062 return 0;
1063}
1064
1065/*
1066 * Analyse superblocks and select the freshest.
1067 */
1068static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
1069{
1070 int ret;
Jonathan E Brassow04475682012-03-28 18:41:26 +01001071 struct raid_dev *dev;
Jonathan Brassowa9ad8522012-04-24 10:23:13 +10001072 struct md_rdev *rdev, *tmp, *freshest;
NeilBrownfd01b882011-10-11 16:47:53 +11001073 struct mddev *mddev = &rs->md;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001074
1075 freshest = NULL;
Jonathan Brassowa9ad8522012-04-24 10:23:13 +10001076 rdev_for_each_safe(rdev, tmp, mddev) {
Jonathan Brassow761becf2012-10-11 13:42:19 +11001077 /*
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001078 * Skipping super_load due to CTR_FLAG_SYNC will cause
Jonathan Brassow761becf2012-10-11 13:42:19 +11001079 * the array to undergo initialization again as
1080 * though it were new. This is the intended effect
1081 * of the "sync" directive.
1082 *
1083 * When reshaping capability is added, we must ensure
1084 * that the "sync" directive is disallowed during the
1085 * reshape.
1086 */
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001087 rdev->sectors = to_sector(i_size_read(rdev->bdev->bd_inode));
1088
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001089 if (rs->ctr_flags & CTR_FLAG_SYNC)
Jonathan Brassow761becf2012-10-11 13:42:19 +11001090 continue;
1091
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001092 if (!rdev->meta_bdev)
1093 continue;
1094
1095 ret = super_load(rdev, freshest);
1096
1097 switch (ret) {
1098 case 1:
1099 freshest = rdev;
1100 break;
1101 case 0:
1102 break;
1103 default:
Jonathan E Brassow04475682012-03-28 18:41:26 +01001104 dev = container_of(rdev, struct raid_dev, rdev);
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06001105 if (dev->meta_dev)
1106 dm_put_device(ti, dev->meta_dev);
Jonathan E Brassow04475682012-03-28 18:41:26 +01001107
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06001108 dev->meta_dev = NULL;
1109 rdev->meta_bdev = NULL;
Jonathan E Brassow04475682012-03-28 18:41:26 +01001110
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06001111 if (rdev->sb_page)
1112 put_page(rdev->sb_page);
Jonathan E Brassow04475682012-03-28 18:41:26 +01001113
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06001114 rdev->sb_page = NULL;
Jonathan E Brassow04475682012-03-28 18:41:26 +01001115
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06001116 rdev->sb_loaded = 0;
Jonathan E Brassow04475682012-03-28 18:41:26 +01001117
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06001118 /*
1119 * We might be able to salvage the data device
1120 * even though the meta device has failed. For
1121 * now, we behave as though '- -' had been
1122 * set for this device in the table.
1123 */
1124 if (dev->data_dev)
1125 dm_put_device(ti, dev->data_dev);
Jonathan E Brassow04475682012-03-28 18:41:26 +01001126
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06001127 dev->data_dev = NULL;
1128 rdev->bdev = NULL;
Jonathan E Brassow04475682012-03-28 18:41:26 +01001129
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06001130 list_del(&rdev->same_set);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001131 }
1132 }
1133
1134 if (!freshest)
1135 return 0;
1136
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06001137 if (validate_raid_redundancy(rs)) {
1138 rs->ti->error = "Insufficient redundancy to activate array";
1139 return -EINVAL;
1140 }
1141
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001142 /*
1143 * Validation of the freshest device provides the source of
1144 * validation for the remaining devices.
1145 */
1146 ti->error = "Unable to assemble array: Invalid superblocks";
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001147 if (super_validate(rs, freshest))
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001148 return -EINVAL;
1149
NeilBrowndafb20f2012-03-19 12:46:39 +11001150 rdev_for_each(rdev, mddev)
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001151 if ((rdev != freshest) && super_validate(rs, rdev))
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001152 return -EINVAL;
1153
1154 return 0;
1155}
1156
1157/*
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02001158 * Enable/disable discard support on RAID set depending on
1159 * RAID level and discard properties of underlying RAID members.
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02001160 */
1161static void configure_discard_support(struct dm_target *ti, struct raid_set *rs)
1162{
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02001163 int i;
1164 bool raid456;
1165
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02001166 /* Assume discards not supported until after checks below. */
1167 ti->discards_supported = false;
1168
1169 /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02001170 raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6);
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02001171
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02001172 for (i = 0; i < rs->md.raid_disks; i++) {
Heinz Mauelshagend20c4b02014-10-29 19:02:27 +01001173 struct request_queue *q;
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02001174
Heinz Mauelshagend20c4b02014-10-29 19:02:27 +01001175 if (!rs->dev[i].rdev.bdev)
1176 continue;
1177
1178 q = bdev_get_queue(rs->dev[i].rdev.bdev);
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02001179 if (!q || !blk_queue_discard(q))
1180 return;
1181
1182 if (raid456) {
1183 if (!q->limits.discard_zeroes_data)
1184 return;
1185 if (!devices_handle_discard_safely) {
1186 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
1187 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
1188 return;
1189 }
1190 }
1191 }
1192
1193 /* All RAID members properly support discards */
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02001194 ti->discards_supported = true;
1195
1196 /*
1197 * RAID1 and RAID10 personalities require bio splitting,
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02001198 * RAID0/4/5/6 don't and process large discard bios properly.
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02001199 */
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02001200 ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10);
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02001201 ti->num_discard_bios = 1;
1202}
1203
1204/*
NeilBrown9d09e662011-01-13 20:00:02 +00001205 * Construct a RAID4/5/6 mapping:
1206 * Args:
1207 * <raid_type> <#raid_params> <raid_params> \
1208 * <#raid_devs> { <meta_dev1> <dev1> .. <meta_devN> <devN> }
1209 *
NeilBrown9d09e662011-01-13 20:00:02 +00001210 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
1211 * details on possible <raid_params>.
1212 */
1213static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
1214{
1215 int ret;
1216 struct raid_type *rt;
1217 unsigned long num_raid_params, num_raid_devs;
1218 struct raid_set *rs = NULL;
1219
1220 /* Must have at least <raid_type> <#raid_params> */
1221 if (argc < 2) {
1222 ti->error = "Too few arguments";
1223 return -EINVAL;
1224 }
1225
1226 /* raid type */
1227 rt = get_raid_type(argv[0]);
1228 if (!rt) {
1229 ti->error = "Unrecognised raid_type";
1230 return -EINVAL;
1231 }
1232 argc--;
1233 argv++;
1234
1235 /* number of RAID parameters */
Jingoo Hanb29bebd2013-06-01 16:15:16 +09001236 if (kstrtoul(argv[0], 10, &num_raid_params) < 0) {
NeilBrown9d09e662011-01-13 20:00:02 +00001237 ti->error = "Cannot understand number of RAID parameters";
1238 return -EINVAL;
1239 }
1240 argc--;
1241 argv++;
1242
1243 /* Skip over RAID params for now and find out # of devices */
Dan Carpenter3ca5a212014-05-29 11:23:23 +03001244 if (num_raid_params >= argc) {
NeilBrown9d09e662011-01-13 20:00:02 +00001245 ti->error = "Arguments do not agree with counts given";
1246 return -EINVAL;
1247 }
1248
Jingoo Hanb29bebd2013-06-01 16:15:16 +09001249 if ((kstrtoul(argv[num_raid_params], 10, &num_raid_devs) < 0) ||
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001250 (num_raid_devs > MAX_RAID_DEVICES)) {
NeilBrown9d09e662011-01-13 20:00:02 +00001251 ti->error = "Cannot understand number of raid devices";
1252 return -EINVAL;
1253 }
1254
Dan Carpenter3ca5a212014-05-29 11:23:23 +03001255 argc -= num_raid_params + 1; /* +1: we already have num_raid_devs */
1256 if (argc != (num_raid_devs * 2)) {
1257 ti->error = "Supplied RAID devices does not match the count given";
1258 return -EINVAL;
1259 }
1260
NeilBrown9d09e662011-01-13 20:00:02 +00001261 rs = context_alloc(ti, rt, (unsigned)num_raid_devs);
1262 if (IS_ERR(rs))
1263 return PTR_ERR(rs);
1264
1265 ret = parse_raid_params(rs, argv, (unsigned)num_raid_params);
1266 if (ret)
1267 goto bad;
1268
NeilBrown9d09e662011-01-13 20:00:02 +00001269 argv += num_raid_params + 1;
1270
NeilBrown9d09e662011-01-13 20:00:02 +00001271 ret = dev_parms(rs, argv);
1272 if (ret)
1273 goto bad;
1274
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001275 rs->md.sync_super = super_sync;
1276 ret = analyse_superblocks(ti, rs);
1277 if (ret)
1278 goto bad;
1279
NeilBrown9d09e662011-01-13 20:00:02 +00001280 INIT_WORK(&rs->md.event_work, do_table_event);
NeilBrown9d09e662011-01-13 20:00:02 +00001281 ti->private = rs;
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +00001282 ti->num_flush_bios = 1;
NeilBrown9d09e662011-01-13 20:00:02 +00001283
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02001284 /*
1285 * Disable/enable discard support on RAID set.
1286 */
1287 configure_discard_support(ti, rs);
1288
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001289 /* Has to be held on running the array */
1290 mddev_lock_nointr(&rs->md);
NeilBrown9d09e662011-01-13 20:00:02 +00001291 ret = md_run(&rs->md);
1292 rs->md.in_sync = 0; /* Assume already marked dirty */
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001293 mddev_unlock(&rs->md);
NeilBrown9d09e662011-01-13 20:00:02 +00001294
1295 if (ret) {
1296 ti->error = "Fail to run raid array";
1297 goto bad;
1298 }
1299
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001300 if (ti->len != rs->md.array_sectors) {
1301 ti->error = "Array size does not match requested target length";
1302 ret = -EINVAL;
1303 goto size_mismatch;
1304 }
NeilBrown9d09e662011-01-13 20:00:02 +00001305 rs->callbacks.congested_fn = raid_is_congested;
NeilBrown9d09e662011-01-13 20:00:02 +00001306 dm_table_add_target_callbacks(ti->table, &rs->callbacks);
1307
Jonathan Brassow32737272011-08-02 12:32:07 +01001308 mddev_suspend(&rs->md);
NeilBrown9d09e662011-01-13 20:00:02 +00001309 return 0;
1310
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001311size_mismatch:
1312 md_stop(&rs->md);
NeilBrown9d09e662011-01-13 20:00:02 +00001313bad:
1314 context_free(rs);
1315
1316 return ret;
1317}
1318
1319static void raid_dtr(struct dm_target *ti)
1320{
1321 struct raid_set *rs = ti->private;
1322
1323 list_del_init(&rs->callbacks.list);
1324 md_stop(&rs->md);
1325 context_free(rs);
1326}
1327
Mikulas Patocka7de3ee52012-12-21 20:23:41 +00001328static int raid_map(struct dm_target *ti, struct bio *bio)
NeilBrown9d09e662011-01-13 20:00:02 +00001329{
1330 struct raid_set *rs = ti->private;
NeilBrownfd01b882011-10-11 16:47:53 +11001331 struct mddev *mddev = &rs->md;
NeilBrown9d09e662011-01-13 20:00:02 +00001332
1333 mddev->pers->make_request(mddev, bio);
1334
1335 return DM_MAPIO_SUBMITTED;
1336}
1337
Jonathan Brassowbe836512013-04-24 11:42:43 +10001338static const char *decipher_sync_action(struct mddev *mddev)
1339{
1340 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
1341 return "frozen";
1342
1343 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1344 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
1345 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
1346 return "reshape";
1347
1348 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1349 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1350 return "resync";
1351 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
1352 return "check";
1353 return "repair";
1354 }
1355
1356 if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
1357 return "recover";
1358 }
1359
1360 return "idle";
1361}
1362
Mikulas Patockafd7c0922013-03-01 22:45:44 +00001363static void raid_status(struct dm_target *ti, status_type_t type,
1364 unsigned status_flags, char *result, unsigned maxlen)
NeilBrown9d09e662011-01-13 20:00:02 +00001365{
1366 struct raid_set *rs = ti->private;
1367 unsigned raid_param_cnt = 1; /* at least 1 for chunksize */
1368 unsigned sz = 0;
Jonathan E Brassow2e727c32011-10-31 20:21:26 +00001369 int i, array_in_sync = 0;
NeilBrown9d09e662011-01-13 20:00:02 +00001370 sector_t sync;
1371
1372 switch (type) {
1373 case STATUSTYPE_INFO:
1374 DMEMIT("%s %d ", rs->raid_type->name, rs->md.raid_disks);
1375
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001376 if (rs->raid_type->level) {
1377 if (test_bit(MD_RECOVERY_RUNNING, &rs->md.recovery))
1378 sync = rs->md.curr_resync_completed;
1379 else
1380 sync = rs->md.recovery_cp;
NeilBrown9d09e662011-01-13 20:00:02 +00001381
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001382 if (sync >= rs->md.resync_max_sectors) {
1383 /*
1384 * Sync complete.
1385 */
1386 array_in_sync = 1;
1387 sync = rs->md.resync_max_sectors;
1388 } else if (test_bit(MD_RECOVERY_REQUESTED, &rs->md.recovery)) {
1389 /*
1390 * If "check" or "repair" is occurring, the array has
1391 * undergone and initial sync and the health characters
1392 * should not be 'a' anymore.
1393 */
1394 array_in_sync = 1;
1395 } else {
1396 /*
1397 * The array may be doing an initial sync, or it may
1398 * be rebuilding individual components. If all the
1399 * devices are In_sync, then it is the array that is
1400 * being initialized.
1401 */
1402 for (i = 0; i < rs->md.raid_disks; i++)
1403 if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
1404 array_in_sync = 1;
1405 }
1406 } else {
1407 /* RAID0 */
Jonathan E Brassow2e727c32011-10-31 20:21:26 +00001408 array_in_sync = 1;
NeilBrown9d09e662011-01-13 20:00:02 +00001409 sync = rs->md.resync_max_sectors;
Jonathan E Brassow2e727c32011-10-31 20:21:26 +00001410 }
Jonathan Brassowbe836512013-04-24 11:42:43 +10001411
Jonathan E Brassow2e727c32011-10-31 20:21:26 +00001412 /*
1413 * Status characters:
1414 * 'D' = Dead/Failed device
1415 * 'a' = Alive but not in-sync
1416 * 'A' = Alive and in-sync
1417 */
1418 for (i = 0; i < rs->md.raid_disks; i++) {
1419 if (test_bit(Faulty, &rs->dev[i].rdev.flags))
1420 DMEMIT("D");
1421 else if (!array_in_sync ||
1422 !test_bit(In_sync, &rs->dev[i].rdev.flags))
1423 DMEMIT("a");
1424 else
1425 DMEMIT("A");
1426 }
NeilBrown9d09e662011-01-13 20:00:02 +00001427
Jonathan E Brassow2e727c32011-10-31 20:21:26 +00001428 /*
1429 * In-sync ratio:
1430 * The in-sync ratio shows the progress of:
1431 * - Initializing the array
1432 * - Rebuilding a subset of devices of the array
1433 * The user can distinguish between the two by referring
1434 * to the status characters.
1435 */
NeilBrown9d09e662011-01-13 20:00:02 +00001436 DMEMIT(" %llu/%llu",
1437 (unsigned long long) sync,
1438 (unsigned long long) rs->md.resync_max_sectors);
1439
Jonathan Brassowbe836512013-04-24 11:42:43 +10001440 /*
1441 * Sync action:
1442 * See Documentation/device-mapper/dm-raid.c for
1443 * information on each of these states.
1444 */
1445 DMEMIT(" %s", decipher_sync_action(&rs->md));
1446
1447 /*
1448 * resync_mismatches/mismatch_cnt
1449 * This field shows the number of discrepancies found when
1450 * performing a "check" of the array.
1451 */
1452 DMEMIT(" %llu",
Jonathan Brassowc4a39552013-06-25 01:23:59 -05001453 (strcmp(rs->md.last_sync_action, "check")) ? 0 :
Jonathan Brassowbe836512013-04-24 11:42:43 +10001454 (unsigned long long)
1455 atomic64_read(&rs->md.resync_mismatches));
NeilBrown9d09e662011-01-13 20:00:02 +00001456 break;
1457 case STATUSTYPE_TABLE:
1458 /* The string you would use to construct this array */
Jonathan Brassow46bed2b2011-08-02 12:32:07 +01001459 for (i = 0; i < rs->md.raid_disks; i++) {
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001460 if ((rs->ctr_flags & CTR_FLAG_REBUILD) &&
Jonathan Brassow13c87582011-08-02 12:32:03 +01001461 rs->dev[i].data_dev &&
NeilBrown9d09e662011-01-13 20:00:02 +00001462 !test_bit(In_sync, &rs->dev[i].rdev.flags))
Jonathan Brassow13c87582011-08-02 12:32:03 +01001463 raid_param_cnt += 2; /* for rebuilds */
Jonathan Brassow46bed2b2011-08-02 12:32:07 +01001464 if (rs->dev[i].data_dev &&
1465 test_bit(WriteMostly, &rs->dev[i].rdev.flags))
1466 raid_param_cnt += 2;
1467 }
NeilBrown9d09e662011-01-13 20:00:02 +00001468
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001469 raid_param_cnt += (hweight32(rs->ctr_flags & ~CTR_FLAG_REBUILD) * 2);
1470 if (rs->ctr_flags & (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC))
NeilBrown9d09e662011-01-13 20:00:02 +00001471 raid_param_cnt--;
1472
1473 DMEMIT("%s %u %u", rs->raid_type->name,
1474 raid_param_cnt, rs->md.chunk_sectors);
1475
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001476 if ((rs->ctr_flags & CTR_FLAG_SYNC) &&
NeilBrown9d09e662011-01-13 20:00:02 +00001477 (rs->md.recovery_cp == MaxSector))
1478 DMEMIT(" sync");
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001479 if (rs->ctr_flags & CTR_FLAG_NOSYNC)
NeilBrown9d09e662011-01-13 20:00:02 +00001480 DMEMIT(" nosync");
1481
1482 for (i = 0; i < rs->md.raid_disks; i++)
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001483 if ((rs->ctr_flags & CTR_FLAG_REBUILD) &&
Jonathan Brassow13c87582011-08-02 12:32:03 +01001484 rs->dev[i].data_dev &&
NeilBrown9d09e662011-01-13 20:00:02 +00001485 !test_bit(In_sync, &rs->dev[i].rdev.flags))
1486 DMEMIT(" rebuild %u", i);
1487
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001488 if (rs->ctr_flags & CTR_FLAG_DAEMON_SLEEP)
NeilBrown9d09e662011-01-13 20:00:02 +00001489 DMEMIT(" daemon_sleep %lu",
1490 rs->md.bitmap_info.daemon_sleep);
1491
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001492 if (rs->ctr_flags & CTR_FLAG_MIN_RECOVERY_RATE)
NeilBrown9d09e662011-01-13 20:00:02 +00001493 DMEMIT(" min_recovery_rate %d", rs->md.sync_speed_min);
1494
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001495 if (rs->ctr_flags & CTR_FLAG_MAX_RECOVERY_RATE)
NeilBrown9d09e662011-01-13 20:00:02 +00001496 DMEMIT(" max_recovery_rate %d", rs->md.sync_speed_max);
1497
Jonathan Brassow46bed2b2011-08-02 12:32:07 +01001498 for (i = 0; i < rs->md.raid_disks; i++)
1499 if (rs->dev[i].data_dev &&
1500 test_bit(WriteMostly, &rs->dev[i].rdev.flags))
1501 DMEMIT(" write_mostly %u", i);
1502
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001503 if (rs->ctr_flags & CTR_FLAG_MAX_WRITE_BEHIND)
NeilBrown9d09e662011-01-13 20:00:02 +00001504 DMEMIT(" max_write_behind %lu",
1505 rs->md.bitmap_info.max_write_behind);
1506
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001507 if (rs->ctr_flags & CTR_FLAG_STRIPE_CACHE) {
NeilBrownd1688a62011-10-11 16:49:52 +11001508 struct r5conf *conf = rs->md.private;
NeilBrown9d09e662011-01-13 20:00:02 +00001509
1510 /* convert from kiB to sectors */
1511 DMEMIT(" stripe_cache %d",
1512 conf ? conf->max_nr_stripes * 2 : 0);
1513 }
1514
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001515 if (rs->ctr_flags & CTR_FLAG_REGION_SIZE)
Jonathan Brassowc1084562011-08-02 12:32:07 +01001516 DMEMIT(" region_size %lu",
1517 rs->md.bitmap_info.chunksize >> 9);
1518
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001519 if (rs->ctr_flags & CTR_FLAG_RAID10_COPIES)
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001520 DMEMIT(" raid10_copies %u",
1521 raid10_md_layout_to_copies(rs->md.layout));
1522
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02001523 if (rs->ctr_flags & CTR_FLAG_RAID10_FORMAT)
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +11001524 DMEMIT(" raid10_format %s",
1525 raid10_md_layout_to_format(rs->md.layout));
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001526
NeilBrown9d09e662011-01-13 20:00:02 +00001527 DMEMIT(" %d", rs->md.raid_disks);
1528 for (i = 0; i < rs->md.raid_disks; i++) {
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001529 if (rs->dev[i].meta_dev)
1530 DMEMIT(" %s", rs->dev[i].meta_dev->name);
1531 else
1532 DMEMIT(" -");
NeilBrown9d09e662011-01-13 20:00:02 +00001533
1534 if (rs->dev[i].data_dev)
1535 DMEMIT(" %s", rs->dev[i].data_dev->name);
1536 else
1537 DMEMIT(" -");
1538 }
1539 }
NeilBrown9d09e662011-01-13 20:00:02 +00001540}
1541
Jonathan Brassowbe836512013-04-24 11:42:43 +10001542static int raid_message(struct dm_target *ti, unsigned argc, char **argv)
1543{
1544 struct raid_set *rs = ti->private;
1545 struct mddev *mddev = &rs->md;
1546
1547 if (!strcasecmp(argv[0], "reshape")) {
1548 DMERR("Reshape not supported.");
1549 return -EINVAL;
1550 }
1551
1552 if (!mddev->pers || !mddev->pers->sync_request)
1553 return -EINVAL;
1554
1555 if (!strcasecmp(argv[0], "frozen"))
1556 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1557 else
1558 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
1559
1560 if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) {
1561 if (mddev->sync_thread) {
1562 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
1563 md_reap_sync_thread(mddev);
1564 }
1565 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1566 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
1567 return -EBUSY;
1568 else if (!strcasecmp(argv[0], "resync"))
1569 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1570 else if (!strcasecmp(argv[0], "recover")) {
1571 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
1572 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1573 } else {
1574 if (!strcasecmp(argv[0], "check"))
1575 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
1576 else if (!!strcasecmp(argv[0], "repair"))
1577 return -EINVAL;
1578 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1579 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
1580 }
1581 if (mddev->ro == 2) {
1582 /* A write to sync_action is enough to justify
1583 * canceling read-auto mode
1584 */
1585 mddev->ro = 0;
1586 if (!mddev->suspended)
1587 md_wakeup_thread(mddev->sync_thread);
1588 }
1589 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1590 if (!mddev->suspended)
1591 md_wakeup_thread(mddev->thread);
1592
1593 return 0;
1594}
1595
1596static int raid_iterate_devices(struct dm_target *ti,
1597 iterate_devices_callout_fn fn, void *data)
NeilBrown9d09e662011-01-13 20:00:02 +00001598{
1599 struct raid_set *rs = ti->private;
1600 unsigned i;
1601 int ret = 0;
1602
1603 for (i = 0; !ret && i < rs->md.raid_disks; i++)
1604 if (rs->dev[i].data_dev)
1605 ret = fn(ti,
1606 rs->dev[i].data_dev,
1607 0, /* No offset on data devs */
1608 rs->md.dev_sectors,
1609 data);
1610
1611 return ret;
1612}
1613
1614static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
1615{
1616 struct raid_set *rs = ti->private;
1617 unsigned chunk_size = rs->md.chunk_sectors << 9;
NeilBrownd1688a62011-10-11 16:49:52 +11001618 struct r5conf *conf = rs->md.private;
NeilBrown9d09e662011-01-13 20:00:02 +00001619
1620 blk_limits_io_min(limits, chunk_size);
1621 blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded));
1622}
1623
1624static void raid_presuspend(struct dm_target *ti)
1625{
1626 struct raid_set *rs = ti->private;
1627
1628 md_stop_writes(&rs->md);
1629}
1630
1631static void raid_postsuspend(struct dm_target *ti)
1632{
1633 struct raid_set *rs = ti->private;
1634
1635 mddev_suspend(&rs->md);
1636}
1637
Jonathan Brassowf381e712013-05-08 17:57:13 -05001638static void attempt_restore_of_faulty_devices(struct raid_set *rs)
NeilBrown9d09e662011-01-13 20:00:02 +00001639{
Jonathan Brassow9092c022013-05-02 14:19:24 -05001640 int i;
1641 uint64_t failed_devices, cleared_failed_devices = 0;
1642 unsigned long flags;
1643 struct dm_raid_superblock *sb;
Jonathan Brassow9092c022013-05-02 14:19:24 -05001644 struct md_rdev *r;
NeilBrown9d09e662011-01-13 20:00:02 +00001645
Jonathan Brassowf381e712013-05-08 17:57:13 -05001646 for (i = 0; i < rs->md.raid_disks; i++) {
1647 r = &rs->dev[i].rdev;
1648 if (test_bit(Faulty, &r->flags) && r->sb_page &&
1649 sync_page_io(r, 0, r->sb_size, r->sb_page, READ, 1)) {
1650 DMINFO("Faulty %s device #%d has readable super block."
1651 " Attempting to revive it.",
1652 rs->raid_type->name, i);
Jonathan Brassowa4dc1632013-05-08 18:00:54 -05001653
1654 /*
1655 * Faulty bit may be set, but sometimes the array can
1656 * be suspended before the personalities can respond
1657 * by removing the device from the array (i.e. calling
1658 * 'hot_remove_disk'). If they haven't yet removed
1659 * the failed device, its 'raid_disk' number will be
1660 * '>= 0' - meaning we must call this function
1661 * ourselves.
1662 */
1663 if ((r->raid_disk >= 0) &&
1664 (r->mddev->pers->hot_remove_disk(r->mddev, r) != 0))
1665 /* Failed to revive this device, try next */
1666 continue;
1667
Jonathan Brassowf381e712013-05-08 17:57:13 -05001668 r->raid_disk = i;
1669 r->saved_raid_disk = i;
1670 flags = r->flags;
1671 clear_bit(Faulty, &r->flags);
1672 clear_bit(WriteErrorSeen, &r->flags);
1673 clear_bit(In_sync, &r->flags);
1674 if (r->mddev->pers->hot_add_disk(r->mddev, r)) {
1675 r->raid_disk = -1;
1676 r->saved_raid_disk = -1;
1677 r->flags = flags;
1678 } else {
1679 r->recovery_offset = 0;
1680 cleared_failed_devices |= 1 << i;
1681 }
1682 }
1683 }
1684 if (cleared_failed_devices) {
1685 rdev_for_each(r, &rs->md) {
1686 sb = page_address(r->sb_page);
1687 failed_devices = le64_to_cpu(sb->failed_devices);
1688 failed_devices &= ~cleared_failed_devices;
1689 sb->failed_devices = cpu_to_le64(failed_devices);
1690 }
1691 }
1692}
1693
1694static void raid_resume(struct dm_target *ti)
1695{
1696 struct raid_set *rs = ti->private;
1697
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001698 if (rs->raid_type->level) {
1699 set_bit(MD_CHANGE_DEVS, &rs->md.flags);
1700
1701 if (!rs->bitmap_loaded) {
1702 bitmap_load(&rs->md);
1703 rs->bitmap_loaded = 1;
1704 } else {
1705 /*
1706 * A secondary resume while the device is active.
1707 * Take this opportunity to check whether any failed
1708 * devices are reachable again.
1709 */
1710 attempt_restore_of_faulty_devices(rs);
1711 }
1712
1713 clear_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
Jonathan Brassow47525e52012-05-22 13:55:29 +10001714 }
Jonathan Brassow34f8ac6d2012-01-27 14:53:53 -06001715
NeilBrown9d09e662011-01-13 20:00:02 +00001716 mddev_resume(&rs->md);
1717}
1718
1719static struct target_type raid_target = {
1720 .name = "raid",
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02001721 .version = {1, 7, 0},
NeilBrown9d09e662011-01-13 20:00:02 +00001722 .module = THIS_MODULE,
1723 .ctr = raid_ctr,
1724 .dtr = raid_dtr,
1725 .map = raid_map,
1726 .status = raid_status,
Jonathan Brassowbe836512013-04-24 11:42:43 +10001727 .message = raid_message,
NeilBrown9d09e662011-01-13 20:00:02 +00001728 .iterate_devices = raid_iterate_devices,
1729 .io_hints = raid_io_hints,
1730 .presuspend = raid_presuspend,
1731 .postsuspend = raid_postsuspend,
1732 .resume = raid_resume,
1733};
1734
1735static int __init dm_raid_init(void)
1736{
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +11001737 DMINFO("Loading target version %u.%u.%u",
1738 raid_target.version[0],
1739 raid_target.version[1],
1740 raid_target.version[2]);
NeilBrown9d09e662011-01-13 20:00:02 +00001741 return dm_register_target(&raid_target);
1742}
1743
1744static void __exit dm_raid_exit(void)
1745{
1746 dm_unregister_target(&raid_target);
1747}
1748
1749module_init(dm_raid_init);
1750module_exit(dm_raid_exit);
1751
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02001752module_param(devices_handle_discard_safely, bool, 0644);
1753MODULE_PARM_DESC(devices_handle_discard_safely,
1754 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
1755
NeilBrown9d09e662011-01-13 20:00:02 +00001756MODULE_DESCRIPTION(DM_NAME " raid4/5/6 target");
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001757MODULE_ALIAS("dm-raid1");
1758MODULE_ALIAS("dm-raid10");
NeilBrown9d09e662011-01-13 20:00:02 +00001759MODULE_ALIAS("dm-raid4");
1760MODULE_ALIAS("dm-raid5");
1761MODULE_ALIAS("dm-raid6");
1762MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
1763MODULE_LICENSE("GPL");