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NeilBrown9d09e662011-01-13 20:00:02 +00001/*
2 * Copyright (C) 2010-2011 Neil Brown
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02003 * Copyright (C) 2010-2016 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 Mauelshagen92c83d72016-05-19 18:49:25 +020020#define MAX_RAID_DEVICES 253 /* md-raid kernel limit */
NeilBrown9d09e662011-01-13 20:00:02 +000021
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +020022/*
23 * Minimum sectors of free reshape space per raid device
24 */
25#define MIN_FREE_RESHAPE_SPACE to_sector(4*4096)
26
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +020027static bool devices_handle_discard_safely = false;
28
NeilBrown9d09e662011-01-13 20:00:02 +000029/*
Jonathan Brassowb12d4372011-08-02 12:32:07 +010030 * The following flags are used by dm-raid.c to set up the array state.
31 * They must be cleared before md_run is called.
NeilBrown9d09e662011-01-13 20:00:02 +000032 */
Mike Snitzer43157842016-05-30 13:03:37 -040033#define FirstUse 10 /* rdev flag */
NeilBrown9d09e662011-01-13 20:00:02 +000034
35struct raid_dev {
36 /*
37 * Two DM devices, one to hold metadata and one to hold the
Mike Snitzer43157842016-05-30 13:03:37 -040038 * actual data/parity. The reason for this is to not confuse
NeilBrown9d09e662011-01-13 20:00:02 +000039 * ti->len and give more flexibility in altering size and
40 * characteristics.
41 *
42 * While it is possible for this device to be associated
43 * with a different physical device than the data_dev, it
44 * is intended for it to be the same.
45 * |--------- Physical Device ---------|
46 * |- meta_dev -|------ data_dev ------|
47 */
48 struct dm_dev *meta_dev;
49 struct dm_dev *data_dev;
NeilBrown3cb03002011-10-11 16:45:26 +110050 struct md_rdev rdev;
NeilBrown9d09e662011-01-13 20:00:02 +000051};
52
53/*
Mike Snitzer42863252016-06-02 12:27:46 -040054 * Bits for establishing rs->ctr_flags
Heinz Mauelshagen702108d2016-05-19 18:49:26 +020055 *
56 * 1 = no flag value
57 * 2 = flag with value
NeilBrown9d09e662011-01-13 20:00:02 +000058 */
Mike Snitzer42863252016-06-02 12:27:46 -040059#define __CTR_FLAG_SYNC 0 /* 1 */ /* Not with raid0! */
60#define __CTR_FLAG_NOSYNC 1 /* 1 */ /* Not with raid0! */
61#define __CTR_FLAG_REBUILD 2 /* 2 */ /* Not with raid0! */
62#define __CTR_FLAG_DAEMON_SLEEP 3 /* 2 */ /* Not with raid0! */
63#define __CTR_FLAG_MIN_RECOVERY_RATE 4 /* 2 */ /* Not with raid0! */
64#define __CTR_FLAG_MAX_RECOVERY_RATE 5 /* 2 */ /* Not with raid0! */
65#define __CTR_FLAG_MAX_WRITE_BEHIND 6 /* 2 */ /* Only with raid1! */
66#define __CTR_FLAG_WRITE_MOSTLY 7 /* 2 */ /* Only with raid1! */
67#define __CTR_FLAG_STRIPE_CACHE 8 /* 2 */ /* Only with raid4/5/6! */
68#define __CTR_FLAG_REGION_SIZE 9 /* 2 */ /* Not with raid0! */
69#define __CTR_FLAG_RAID10_COPIES 10 /* 2 */ /* Only with raid10 */
70#define __CTR_FLAG_RAID10_FORMAT 11 /* 2 */ /* Only with raid10 */
Mike Snitzer9b6e5422016-06-02 11:48:09 -040071/* New for v1.9.0 */
Mike Snitzer42863252016-06-02 12:27:46 -040072#define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid4/5/6/10! */
73#define __CTR_FLAG_DATA_OFFSET 13 /* 2 */ /* Only with reshapable raid4/5/6/10! */
74#define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */
75
76/*
77 * Flags for rs->ctr_flags field.
78 */
79#define CTR_FLAG_SYNC (1 << __CTR_FLAG_SYNC)
80#define CTR_FLAG_NOSYNC (1 << __CTR_FLAG_NOSYNC)
81#define CTR_FLAG_REBUILD (1 << __CTR_FLAG_REBUILD)
82#define CTR_FLAG_DAEMON_SLEEP (1 << __CTR_FLAG_DAEMON_SLEEP)
83#define CTR_FLAG_MIN_RECOVERY_RATE (1 << __CTR_FLAG_MIN_RECOVERY_RATE)
84#define CTR_FLAG_MAX_RECOVERY_RATE (1 << __CTR_FLAG_MAX_RECOVERY_RATE)
85#define CTR_FLAG_MAX_WRITE_BEHIND (1 << __CTR_FLAG_MAX_WRITE_BEHIND)
86#define CTR_FLAG_WRITE_MOSTLY (1 << __CTR_FLAG_WRITE_MOSTLY)
87#define CTR_FLAG_STRIPE_CACHE (1 << __CTR_FLAG_STRIPE_CACHE)
88#define CTR_FLAG_REGION_SIZE (1 << __CTR_FLAG_REGION_SIZE)
89#define CTR_FLAG_RAID10_COPIES (1 << __CTR_FLAG_RAID10_COPIES)
90#define CTR_FLAG_RAID10_FORMAT (1 << __CTR_FLAG_RAID10_FORMAT)
91#define CTR_FLAG_DELTA_DISKS (1 << __CTR_FLAG_DELTA_DISKS)
92#define CTR_FLAG_DATA_OFFSET (1 << __CTR_FLAG_DATA_OFFSET)
93#define CTR_FLAG_RAID10_USE_NEAR_SETS (1 << __CTR_FLAG_RAID10_USE_NEAR_SETS)
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -050094
Heinz Mauelshagenf0902792016-05-19 18:49:27 +020095/*
96 * Definitions of various constructor flags to
97 * be used in checks of valid / invalid flags
98 * per raid level.
99 */
100/* Define all any sync flags */
101#define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
102
103/* Define flags for options without argument (e.g. 'nosync') */
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200104#define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \
105 CTR_FLAG_RAID10_USE_NEAR_SETS)
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200106
107/* Define flags for options with one argument (e.g. 'delta_disks +2') */
108#define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \
109 CTR_FLAG_WRITE_MOSTLY | \
110 CTR_FLAG_DAEMON_SLEEP | \
111 CTR_FLAG_MIN_RECOVERY_RATE | \
112 CTR_FLAG_MAX_RECOVERY_RATE | \
113 CTR_FLAG_MAX_WRITE_BEHIND | \
114 CTR_FLAG_STRIPE_CACHE | \
115 CTR_FLAG_REGION_SIZE | \
116 CTR_FLAG_RAID10_COPIES | \
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200117 CTR_FLAG_RAID10_FORMAT | \
118 CTR_FLAG_DELTA_DISKS | \
119 CTR_FLAG_DATA_OFFSET)
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200120
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200121/* Valid options definitions per raid level... */
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200122
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200123/* "raid0" does only accept data offset */
124#define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET)
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200125
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200126/* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */
127#define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
128 CTR_FLAG_REBUILD | \
129 CTR_FLAG_WRITE_MOSTLY | \
130 CTR_FLAG_DAEMON_SLEEP | \
131 CTR_FLAG_MIN_RECOVERY_RATE | \
132 CTR_FLAG_MAX_RECOVERY_RATE | \
133 CTR_FLAG_MAX_WRITE_BEHIND | \
134 CTR_FLAG_REGION_SIZE | \
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200135 CTR_FLAG_DATA_OFFSET)
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200136
137/* "raid10" does not accept any raid1 or stripe cache options */
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200138#define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
139 CTR_FLAG_REBUILD | \
140 CTR_FLAG_DAEMON_SLEEP | \
141 CTR_FLAG_MIN_RECOVERY_RATE | \
142 CTR_FLAG_MAX_RECOVERY_RATE | \
143 CTR_FLAG_REGION_SIZE | \
144 CTR_FLAG_RAID10_COPIES | \
145 CTR_FLAG_RAID10_FORMAT | \
146 CTR_FLAG_DELTA_DISKS | \
147 CTR_FLAG_DATA_OFFSET | \
148 CTR_FLAG_RAID10_USE_NEAR_SETS)
149
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200150/*
151 * "raid4/5/6" do not accept any raid1 or raid10 specific options
152 *
153 * "raid6" does not accept "nosync", because it is not guaranteed
154 * that both parity and q-syndrome are being written properly with
155 * any writes
156 */
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200157#define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
158 CTR_FLAG_REBUILD | \
159 CTR_FLAG_DAEMON_SLEEP | \
160 CTR_FLAG_MIN_RECOVERY_RATE | \
161 CTR_FLAG_MAX_RECOVERY_RATE | \
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200162 CTR_FLAG_MAX_WRITE_BEHIND | \
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200163 CTR_FLAG_STRIPE_CACHE | \
164 CTR_FLAG_REGION_SIZE | \
165 CTR_FLAG_DELTA_DISKS | \
166 CTR_FLAG_DATA_OFFSET)
167
168#define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \
169 CTR_FLAG_REBUILD | \
170 CTR_FLAG_DAEMON_SLEEP | \
171 CTR_FLAG_MIN_RECOVERY_RATE | \
172 CTR_FLAG_MAX_RECOVERY_RATE | \
173 CTR_FLAG_MAX_WRITE_BEHIND | \
174 CTR_FLAG_STRIPE_CACHE | \
175 CTR_FLAG_REGION_SIZE | \
176 CTR_FLAG_DELTA_DISKS | \
177 CTR_FLAG_DATA_OFFSET)
178/* ...valid options definitions per raid level */
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200179
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +0200180/*
181 * Flags for rs->runtime_flags field
182 * (RT_FLAG prefix meaning "runtime flag")
183 *
184 * These are all internal and used to define runtime state,
185 * e.g. to prevent another resume from preresume processing
186 * the raid set all over again.
187 */
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +0200188#define RT_FLAG_RS_PRERESUMED 0
189#define RT_FLAG_RS_RESUMED 1
190#define RT_FLAG_RS_BITMAP_LOADED 2
191#define RT_FLAG_UPDATE_SBS 3
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200192#define RT_FLAG_RESHAPE_RS 4
Heinz Mauelshagen6e209022016-06-14 15:23:13 -0400193#define RT_FLAG_KEEP_RS_FROZEN 5
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +0200194
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200195/* Array elements of 64 bit needed for rebuild/write_mostly bits */
196#define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
197
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +0200198/*
199 * raid set level, layout and chunk sectors backup/restore
200 */
201struct rs_layout {
202 int new_level;
203 int new_layout;
204 int new_chunk_sectors;
205};
206
NeilBrown9d09e662011-01-13 20:00:02 +0000207struct raid_set {
208 struct dm_target *ti;
209
Jonathan Brassow34f8ac6d2012-01-27 14:53:53 -0600210 uint32_t bitmap_loaded;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200211 uint32_t stripe_cache_entries;
Mike Snitzer42863252016-06-02 12:27:46 -0400212 unsigned long ctr_flags;
213 unsigned long runtime_flags;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +0200214
215 uint64_t rebuild_disks[DISKS_ARRAY_ELEMS];
NeilBrown9d09e662011-01-13 20:00:02 +0000216
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200217 int raid_disks;
218 int delta_disks;
Heinz Mauelshagen4763e542016-05-19 18:49:31 +0200219 int data_offset;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200220 int raid10_copies;
Heinz Mauelshagen4257e082016-06-14 01:46:03 +0200221 int requested_bitmap_chunk_sectors;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200222
NeilBrownfd01b882011-10-11 16:47:53 +1100223 struct mddev md;
NeilBrown9d09e662011-01-13 20:00:02 +0000224 struct raid_type *raid_type;
225 struct dm_target_callbacks callbacks;
226
227 struct raid_dev dev[0];
228};
229
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200230static void rs_config_backup(struct raid_set *rs, struct rs_layout *l)
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +0200231{
232 struct mddev *mddev = &rs->md;
233
234 l->new_level = mddev->new_level;
235 l->new_layout = mddev->new_layout;
236 l->new_chunk_sectors = mddev->new_chunk_sectors;
237}
238
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200239static void rs_config_restore(struct raid_set *rs, struct rs_layout *l)
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +0200240{
241 struct mddev *mddev = &rs->md;
242
243 mddev->new_level = l->new_level;
244 mddev->new_layout = l->new_layout;
245 mddev->new_chunk_sectors = l->new_chunk_sectors;
246}
247
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200248/* raid10 algorithms (i.e. formats) */
249#define ALGORITHM_RAID10_DEFAULT 0
250#define ALGORITHM_RAID10_NEAR 1
251#define ALGORITHM_RAID10_OFFSET 2
252#define ALGORITHM_RAID10_FAR 3
253
NeilBrown9d09e662011-01-13 20:00:02 +0000254/* Supported raid types and properties. */
255static struct raid_type {
256 const char *name; /* RAID algorithm. */
257 const char *descr; /* Descriptor text for logging. */
258 const unsigned parity_devs; /* # of parity devices. */
259 const unsigned minimal_devs; /* minimal # of devices in set. */
260 const unsigned level; /* RAID level. */
261 const unsigned algorithm; /* RAID algorithm. */
262} raid_types[] = {
Mike Snitzer43157842016-05-30 13:03:37 -0400263 {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */},
264 {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */},
265 {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR},
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200266 {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET},
Mike Snitzer43157842016-05-30 13:03:37 -0400267 {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR},
268 {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT},
269 {"raid4", "raid4 (dedicated last parity disk)", 1, 2, 4, ALGORITHM_PARITY_N}, /* raid4 layout = raid5_n */
270 {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N},
271 {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
272 {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
273 {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
274 {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
275 {"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
276 {"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
277 {"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE},
278 {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6},
279 {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6},
280 {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6},
281 {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6},
282 {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6}
NeilBrown9d09e662011-01-13 20:00:02 +0000283};
284
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +0200285/* True, if @v is in inclusive range [@min, @max] */
Mike Snitzerbb91a632016-06-02 12:06:54 -0400286static bool __within_range(long v, long min, long max)
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +0200287{
288 return v >= min && v <= max;
289}
290
Heinz Mauelshagen702108d2016-05-19 18:49:26 +0200291/* All table line arguments are defined here */
292static struct arg_name_flag {
Mike Snitzer42863252016-06-02 12:27:46 -0400293 const unsigned long flag;
Heinz Mauelshagen702108d2016-05-19 18:49:26 +0200294 const char *name;
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400295} __arg_name_flags[] = {
Heinz Mauelshagen702108d2016-05-19 18:49:26 +0200296 { CTR_FLAG_SYNC, "sync"},
297 { CTR_FLAG_NOSYNC, "nosync"},
298 { CTR_FLAG_REBUILD, "rebuild"},
299 { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"},
300 { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"},
301 { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"},
302 { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"},
Heinz Mauelshagen65359ee2016-06-24 21:32:25 +0200303 { CTR_FLAG_WRITE_MOSTLY, "write_mostly"},
Heinz Mauelshagen702108d2016-05-19 18:49:26 +0200304 { CTR_FLAG_STRIPE_CACHE, "stripe_cache"},
305 { CTR_FLAG_REGION_SIZE, "region_size"},
306 { CTR_FLAG_RAID10_COPIES, "raid10_copies"},
307 { CTR_FLAG_RAID10_FORMAT, "raid10_format"},
Heinz Mauelshagen4763e542016-05-19 18:49:31 +0200308 { CTR_FLAG_DATA_OFFSET, "data_offset"},
309 { CTR_FLAG_DELTA_DISKS, "delta_disks"},
310 { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"},
Heinz Mauelshagen702108d2016-05-19 18:49:26 +0200311};
312
313/* Return argument name string for given @flag */
Mike Snitzer3fa6cf32016-06-02 11:58:51 -0400314static const char *dm_raid_arg_name_by_flag(const uint32_t flag)
Heinz Mauelshagen702108d2016-05-19 18:49:26 +0200315{
316 if (hweight32(flag) == 1) {
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400317 struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags);
Heinz Mauelshagen702108d2016-05-19 18:49:26 +0200318
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400319 while (anf-- > __arg_name_flags)
Mike Snitzer42863252016-06-02 12:27:46 -0400320 if (flag & anf->flag)
Heinz Mauelshagen702108d2016-05-19 18:49:26 +0200321 return anf->name;
322
323 } else
324 DMERR("%s called with more than one flag!", __func__);
325
326 return NULL;
327}
328
329/*
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200330 * bool helpers to test for various raid levels of a raid set,
331 * is. it's level as reported by the superblock rather than
332 * the requested raid_type passed to the constructor.
333 */
334/* Return true, if raid set in @rs is raid0 */
335static bool rs_is_raid0(struct raid_set *rs)
336{
337 return !rs->md.level;
338}
339
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200340/* Return true, if raid set in @rs is raid1 */
341static bool rs_is_raid1(struct raid_set *rs)
342{
343 return rs->md.level == 1;
344}
345
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200346/* Return true, if raid set in @rs is raid10 */
347static bool rs_is_raid10(struct raid_set *rs)
348{
349 return rs->md.level == 10;
350}
351
Heinz Mauelshagen4dff2f12016-06-24 00:21:09 +0200352/* Return true, if raid set in @rs is level 6 */
353static bool rs_is_raid6(struct raid_set *rs)
354{
355 return rs->md.level == 6;
356}
357
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +0200358/* Return true, if raid set in @rs is level 4, 5 or 6 */
359static bool rs_is_raid456(struct raid_set *rs)
360{
361 return __within_range(rs->md.level, 4, 6);
362}
363
364/* Return true, if raid set in @rs is reshapable */
365static unsigned int __is_raid10_far(int layout);
366static bool rs_is_reshapable(struct raid_set *rs)
367{
368 return rs_is_raid456(rs) ||
369 (rs_is_raid10(rs) && !__is_raid10_far(rs->md.new_layout));
370}
371
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200372/* Return true, if raid set in @rs is recovering */
373static bool rs_is_recovering(struct raid_set *rs)
374{
Heinz Mauelshagen345a6cd2016-06-25 02:42:54 +0200375 return rs->md.recovery_cp < rs->dev[0].rdev.sectors;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200376}
377
378/* Return true, if raid set in @rs is reshaping */
379static bool rs_is_reshaping(struct raid_set *rs)
380{
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200381 return rs->md.reshape_position != MaxSector;
382}
383
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200384/*
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200385 * bool helpers to test for various raid levels of a raid type
386 */
387
388/* Return true, if raid type in @rt is raid0 */
389static bool rt_is_raid0(struct raid_type *rt)
390{
391 return !rt->level;
392}
393
394/* Return true, if raid type in @rt is raid1 */
395static bool rt_is_raid1(struct raid_type *rt)
396{
397 return rt->level == 1;
398}
399
400/* Return true, if raid type in @rt is raid10 */
401static bool rt_is_raid10(struct raid_type *rt)
402{
403 return rt->level == 10;
404}
405
406/* Return true, if raid type in @rt is raid4/5 */
407static bool rt_is_raid45(struct raid_type *rt)
408{
Mike Snitzerbb91a632016-06-02 12:06:54 -0400409 return __within_range(rt->level, 4, 5);
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200410}
411
412/* Return true, if raid type in @rt is raid6 */
413static bool rt_is_raid6(struct raid_type *rt)
414{
415 return rt->level == 6;
416}
Heinz Mauelshagen676fa5a2016-05-19 18:49:29 +0200417
418/* Return true, if raid type in @rt is raid4/5/6 */
419static bool rt_is_raid456(struct raid_type *rt)
420{
Mike Snitzerbb91a632016-06-02 12:06:54 -0400421 return __within_range(rt->level, 4, 6);
Heinz Mauelshagen676fa5a2016-05-19 18:49:29 +0200422}
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200423/* END: raid level bools */
424
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200425/* Return valid ctr flags for the raid level of @rs */
426static unsigned long __valid_flags(struct raid_set *rs)
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200427{
428 if (rt_is_raid0(rs->raid_type))
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200429 return RAID0_VALID_FLAGS;
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200430 else if (rt_is_raid1(rs->raid_type))
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200431 return RAID1_VALID_FLAGS;
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200432 else if (rt_is_raid10(rs->raid_type))
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200433 return RAID10_VALID_FLAGS;
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200434 else if (rt_is_raid45(rs->raid_type))
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200435 return RAID45_VALID_FLAGS;
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200436 else if (rt_is_raid6(rs->raid_type))
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200437 return RAID6_VALID_FLAGS;
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200438
439 return ~0;
440}
441
442/*
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200443 * Check for valid flags set on @rs
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200444 *
445 * Has to be called after parsing of the ctr flags!
446 */
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200447static int rs_check_for_valid_flags(struct raid_set *rs)
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200448{
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +0200449 if (rs->ctr_flags & ~__valid_flags(rs)) {
Mike Snitzer42863252016-06-02 12:27:46 -0400450 rs->ti->error = "Invalid flags combination";
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400451 return -EINVAL;
452 }
Heinz Mauelshagenf0902792016-05-19 18:49:27 +0200453
454 return 0;
455}
456
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200457/* MD raid10 bit definitions and helpers */
458#define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */
459#define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
460#define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */
461#define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */
462
463/* Return md raid10 near copies for @layout */
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400464static unsigned int __raid10_near_copies(int layout)
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200465{
466 return layout & 0xFF;
467}
468
469/* Return md raid10 far copies for @layout */
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400470static unsigned int __raid10_far_copies(int layout)
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200471{
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400472 return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200473}
474
475/* Return true if md raid10 offset for @layout */
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400476static unsigned int __is_raid10_offset(int layout)
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200477{
478 return layout & RAID10_OFFSET;
479}
480
481/* Return true if md raid10 near for @layout */
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400482static unsigned int __is_raid10_near(int layout)
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200483{
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400484 return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200485}
486
487/* Return true if md raid10 far for @layout */
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400488static unsigned int __is_raid10_far(int layout)
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200489{
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400490 return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200491}
492
493/* Return md raid10 layout string for @layout */
494static const char *raid10_md_layout_to_format(int layout)
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100495{
496 /*
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200497 * Bit 16 stands for "offset"
498 * (i.e. adjacent stripes hold copies)
499 *
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100500 * Refer to MD's raid10.c for details
501 */
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400502 if (__is_raid10_offset(layout))
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100503 return "offset";
504
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400505 if (__raid10_near_copies(layout) > 1)
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100506 return "near";
507
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400508 WARN_ON(__raid10_far_copies(layout) < 2);
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200509
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100510 return "far";
511}
512
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200513/* Return md raid10 algorithm for @name */
Arnd Bergmann68c1c4d2016-06-16 11:03:25 +0200514static int raid10_name_to_format(const char *name)
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500515{
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200516 if (!strcasecmp(name, "near"))
517 return ALGORITHM_RAID10_NEAR;
518 else if (!strcasecmp(name, "offset"))
519 return ALGORITHM_RAID10_OFFSET;
520 else if (!strcasecmp(name, "far"))
521 return ALGORITHM_RAID10_FAR;
522
523 return -EINVAL;
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500524}
525
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200526/* Return md raid10 copies for @layout */
527static unsigned int raid10_md_layout_to_copies(int layout)
528{
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400529 return __raid10_near_copies(layout) > 1 ?
530 __raid10_near_copies(layout) : __raid10_far_copies(layout);
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200531}
532
533/* Return md raid10 format id for @format string */
534static int raid10_format_to_md_layout(struct raid_set *rs,
535 unsigned int algorithm,
536 unsigned int copies)
537{
538 unsigned int n = 1, f = 1, r = 0;
539
540 /*
541 * MD resilienece flaw:
542 *
543 * enabling use_far_sets for far/offset formats causes copies
544 * to be colocated on the same devs together with their origins!
545 *
546 * -> disable it for now in the definition above
547 */
548 if (algorithm == ALGORITHM_RAID10_DEFAULT ||
549 algorithm == ALGORITHM_RAID10_NEAR)
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100550 n = copies;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200551
552 else if (algorithm == ALGORITHM_RAID10_OFFSET) {
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100553 f = copies;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200554 r = RAID10_OFFSET;
Mike Snitzer42863252016-06-02 12:27:46 -0400555 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200556 r |= RAID10_USE_FAR_SETS;
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100557
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200558 } else if (algorithm == ALGORITHM_RAID10_FAR) {
559 f = copies;
560 r = !RAID10_OFFSET;
Mike Snitzer42863252016-06-02 12:27:46 -0400561 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200562 r |= RAID10_USE_FAR_SETS;
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100563
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200564 } else
565 return -EINVAL;
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100566
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200567 return r | (f << RAID10_FAR_COPIES_SHIFT) | n;
568}
569/* END: MD raid10 bit definitions and helpers */
570
571/* Check for any of the raid10 algorithms */
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400572static int __got_raid10(struct raid_type *rtp, const int layout)
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200573{
574 if (rtp->level == 10) {
575 switch (rtp->algorithm) {
576 case ALGORITHM_RAID10_DEFAULT:
577 case ALGORITHM_RAID10_NEAR:
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400578 return __is_raid10_near(layout);
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200579 case ALGORITHM_RAID10_OFFSET:
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400580 return __is_raid10_offset(layout);
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200581 case ALGORITHM_RAID10_FAR:
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400582 return __is_raid10_far(layout);
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200583 default:
584 break;
585 }
586 }
587
588 return 0;
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -0500589}
590
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200591/* Return raid_type for @name */
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +0200592static struct raid_type *get_raid_type(const char *name)
NeilBrown9d09e662011-01-13 20:00:02 +0000593{
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200594 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
NeilBrown9d09e662011-01-13 20:00:02 +0000595
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200596 while (rtp-- > raid_types)
597 if (!strcasecmp(rtp->name, name))
598 return rtp;
NeilBrown9d09e662011-01-13 20:00:02 +0000599
600 return NULL;
601}
602
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200603/* Return raid_type for @name based derived from @level and @layout */
604static struct raid_type *get_raid_type_by_ll(const int level, const int layout)
605{
606 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
607
608 while (rtp-- > raid_types) {
609 /* RAID10 special checks based on @layout flags/properties */
610 if (rtp->level == level &&
Mike Snitzere6ca5e12016-06-02 15:27:22 -0400611 (__got_raid10(rtp, layout) || rtp->algorithm == layout))
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200612 return rtp;
613 }
614
615 return NULL;
616}
617
618/*
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200619 * Conditionally change bdev capacity of @rs
620 * in case of a disk add/remove reshape
621 */
622static void rs_set_capacity(struct raid_set *rs)
623{
624 struct mddev *mddev = &rs->md;
Heinz Mauelshagenfbe63652016-06-24 00:36:08 +0200625 struct md_rdev *rdev;
Heinz Mauelshagen0095dbc2016-06-24 00:10:12 +0200626 struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200627
Heinz Mauelshagenfbe63652016-06-24 00:36:08 +0200628 /*
629 * raid10 sets rdev->sector to the device size, which
630 * is unintended in case of out-of-place reshaping
631 */
632 rdev_for_each(rdev, mddev)
633 rdev->sectors = mddev->dev_sectors;
634
Heinz Mauelshagen0095dbc2016-06-24 00:10:12 +0200635 set_capacity(gendisk, mddev->array_sectors);
636 revalidate_disk(gendisk);
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200637}
638
639/*
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +0200640 * Set the mddev properties in @rs to the current
641 * ones retrieved from the freshest superblock
642 */
643static void rs_set_cur(struct raid_set *rs)
644{
645 struct mddev *mddev = &rs->md;
646
647 mddev->new_level = mddev->level;
648 mddev->new_layout = mddev->layout;
649 mddev->new_chunk_sectors = mddev->chunk_sectors;
650}
651
652/*
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200653 * Set the mddev properties in @rs to the new
654 * ones requested by the ctr
655 */
656static void rs_set_new(struct raid_set *rs)
657{
658 struct mddev *mddev = &rs->md;
659
660 mddev->level = mddev->new_level;
661 mddev->layout = mddev->new_layout;
662 mddev->chunk_sectors = mddev->new_chunk_sectors;
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +0200663 mddev->raid_disks = rs->raid_disks;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200664 mddev->delta_disks = 0;
665}
666
Mike Snitzerbfcee0e2016-06-02 15:08:09 -0400667static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type,
668 unsigned raid_devs)
NeilBrown9d09e662011-01-13 20:00:02 +0000669{
670 unsigned i;
671 struct raid_set *rs;
NeilBrown9d09e662011-01-13 20:00:02 +0000672
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400673 if (raid_devs <= raid_type->parity_devs) {
674 ti->error = "Insufficient number of devices";
675 return ERR_PTR(-EINVAL);
676 }
NeilBrown9d09e662011-01-13 20:00:02 +0000677
NeilBrown9d09e662011-01-13 20:00:02 +0000678 rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400679 if (!rs) {
680 ti->error = "Cannot allocate raid context";
681 return ERR_PTR(-ENOMEM);
682 }
NeilBrown9d09e662011-01-13 20:00:02 +0000683
684 mddev_init(&rs->md);
685
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +0200686 rs->raid_disks = raid_devs;
687 rs->delta_disks = 0;
688
NeilBrown9d09e662011-01-13 20:00:02 +0000689 rs->ti = ti;
690 rs->raid_type = raid_type;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200691 rs->stripe_cache_entries = 256;
NeilBrown9d09e662011-01-13 20:00:02 +0000692 rs->md.raid_disks = raid_devs;
693 rs->md.level = raid_type->level;
694 rs->md.new_level = rs->md.level;
NeilBrown9d09e662011-01-13 20:00:02 +0000695 rs->md.layout = raid_type->algorithm;
696 rs->md.new_layout = rs->md.layout;
697 rs->md.delta_disks = 0;
Heinz Mauelshagen4dff2f12016-06-24 00:21:09 +0200698 rs->md.recovery_cp = MaxSector;
NeilBrown9d09e662011-01-13 20:00:02 +0000699
700 for (i = 0; i < raid_devs; i++)
701 md_rdev_init(&rs->dev[i].rdev);
702
703 /*
704 * Remaining items to be initialized by further RAID params:
705 * rs->md.persistent
706 * rs->md.external
707 * rs->md.chunk_sectors
708 * rs->md.new_chunk_sectors
Jonathan E Brassowc039c332012-07-27 15:08:04 +0100709 * rs->md.dev_sectors
NeilBrown9d09e662011-01-13 20:00:02 +0000710 */
711
712 return rs;
713}
714
Mike Snitzerbfcee0e2016-06-02 15:08:09 -0400715static void raid_set_free(struct raid_set *rs)
NeilBrown9d09e662011-01-13 20:00:02 +0000716{
717 int i;
718
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100719 for (i = 0; i < rs->md.raid_disks; i++) {
720 if (rs->dev[i].meta_dev)
721 dm_put_device(rs->ti, rs->dev[i].meta_dev);
NeilBrown545c8792012-05-22 13:54:30 +1000722 md_rdev_clear(&rs->dev[i].rdev);
NeilBrown9d09e662011-01-13 20:00:02 +0000723 if (rs->dev[i].data_dev)
724 dm_put_device(rs->ti, rs->dev[i].data_dev);
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100725 }
NeilBrown9d09e662011-01-13 20:00:02 +0000726
727 kfree(rs);
728}
729
730/*
731 * For every device we have two words
732 * <meta_dev>: meta device name or '-' if missing
733 * <data_dev>: data device name or '-' if missing
734 *
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100735 * The following are permitted:
736 * - -
737 * - <data_dev>
738 * <meta_dev> <data_dev>
739 *
740 * The following is not allowed:
741 * <meta_dev> -
742 *
743 * This code parses those words. If there is a failure,
Mike Snitzerbfcee0e2016-06-02 15:08:09 -0400744 * the caller must use raid_set_free() to unwind the operations.
NeilBrown9d09e662011-01-13 20:00:02 +0000745 */
Heinz Mauelshagen702108d2016-05-19 18:49:26 +0200746static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as)
NeilBrown9d09e662011-01-13 20:00:02 +0000747{
748 int i;
749 int rebuild = 0;
750 int metadata_available = 0;
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +0200751 int r = 0;
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +0200752 const char *arg;
NeilBrown9d09e662011-01-13 20:00:02 +0000753
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +0200754 /* Put off the number of raid devices argument to get to dev pairs */
755 arg = dm_shift_arg(as);
756 if (!arg)
757 return -EINVAL;
758
759 for (i = 0; i < rs->md.raid_disks; i++) {
NeilBrown9d09e662011-01-13 20:00:02 +0000760 rs->dev[i].rdev.raid_disk = i;
761
762 rs->dev[i].meta_dev = NULL;
763 rs->dev[i].data_dev = NULL;
764
765 /*
766 * There are no offsets, since there is a separate device
767 * for data and metadata.
768 */
769 rs->dev[i].rdev.data_offset = 0;
770 rs->dev[i].rdev.mddev = &rs->md;
771
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +0200772 arg = dm_shift_arg(as);
773 if (!arg)
774 return -EINVAL;
775
776 if (strcmp(arg, "-")) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400777 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
778 &rs->dev[i].meta_dev);
779 if (r) {
780 rs->ti->error = "RAID metadata device lookup failure";
781 return r;
782 }
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100783
784 rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400785 if (!rs->dev[i].rdev.sb_page) {
786 rs->ti->error = "Failed to allocate superblock page";
787 return -ENOMEM;
788 }
NeilBrown9d09e662011-01-13 20:00:02 +0000789 }
790
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +0200791 arg = dm_shift_arg(as);
792 if (!arg)
793 return -EINVAL;
794
795 if (!strcmp(arg, "-")) {
NeilBrown9d09e662011-01-13 20:00:02 +0000796 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400797 (!rs->dev[i].rdev.recovery_offset)) {
798 rs->ti->error = "Drive designated for rebuild not specified";
799 return -EINVAL;
800 }
NeilBrown9d09e662011-01-13 20:00:02 +0000801
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400802 if (rs->dev[i].meta_dev) {
803 rs->ti->error = "No data device supplied with metadata device";
804 return -EINVAL;
805 }
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100806
NeilBrown9d09e662011-01-13 20:00:02 +0000807 continue;
808 }
809
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400810 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
811 &rs->dev[i].data_dev);
812 if (r) {
813 rs->ti->error = "RAID device lookup failure";
814 return r;
815 }
NeilBrown9d09e662011-01-13 20:00:02 +0000816
Jonathan Brassowb12d4372011-08-02 12:32:07 +0100817 if (rs->dev[i].meta_dev) {
818 metadata_available = 1;
819 rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
820 }
NeilBrown9d09e662011-01-13 20:00:02 +0000821 rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +0200822 list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks);
NeilBrown9d09e662011-01-13 20:00:02 +0000823 if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
824 rebuild++;
825 }
826
827 if (metadata_available) {
828 rs->md.external = 0;
829 rs->md.persistent = 1;
830 rs->md.major_version = 2;
831 } else if (rebuild && !rs->md.recovery_cp) {
832 /*
833 * Without metadata, we will not be able to tell if the array
834 * is in-sync or not - we must assume it is not. Therefore,
835 * it is impossible to rebuild a drive.
836 *
837 * Even if there is metadata, the on-disk information may
838 * indicate that the array is not in-sync and it will then
839 * fail at that time.
840 *
841 * User could specify 'nosync' option if desperate.
842 */
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400843 rs->ti->error = "Unable to rebuild drive while array is not in-sync";
844 return -EINVAL;
NeilBrown9d09e662011-01-13 20:00:02 +0000845 }
846
847 return 0;
848}
849
850/*
Jonathan Brassowc1084562011-08-02 12:32:07 +0100851 * validate_region_size
852 * @rs
853 * @region_size: region size in sectors. If 0, pick a size (4MiB default).
854 *
855 * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
856 * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
857 *
858 * Returns: 0 on success, -EINVAL on failure.
859 */
860static int validate_region_size(struct raid_set *rs, unsigned long region_size)
861{
862 unsigned long min_region_size = rs->ti->len / (1 << 21);
863
864 if (!region_size) {
865 /*
Mike Snitzer43157842016-05-30 13:03:37 -0400866 * Choose a reasonable default. All figures in sectors.
Jonathan Brassowc1084562011-08-02 12:32:07 +0100867 */
868 if (min_region_size > (1 << 13)) {
Jonathan Brassow3a0f9aa2012-12-21 20:23:33 +0000869 /* If not a power of 2, make it the next power of 2 */
Mikulas Patocka042745e2015-10-02 11:17:37 -0400870 region_size = roundup_pow_of_two(min_region_size);
Jonathan Brassowc1084562011-08-02 12:32:07 +0100871 DMINFO("Choosing default region size of %lu sectors",
872 region_size);
Jonathan Brassowc1084562011-08-02 12:32:07 +0100873 } else {
874 DMINFO("Choosing default region size of 4MiB");
875 region_size = 1 << 13; /* sectors */
876 }
877 } else {
878 /*
879 * Validate user-supplied value.
880 */
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400881 if (region_size > rs->ti->len) {
882 rs->ti->error = "Supplied region size is too large";
883 return -EINVAL;
884 }
Jonathan Brassowc1084562011-08-02 12:32:07 +0100885
886 if (region_size < min_region_size) {
887 DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
888 region_size, min_region_size);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400889 rs->ti->error = "Supplied region size is too small";
890 return -EINVAL;
Jonathan Brassowc1084562011-08-02 12:32:07 +0100891 }
892
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400893 if (!is_power_of_2(region_size)) {
894 rs->ti->error = "Region size is not a power of 2";
895 return -EINVAL;
896 }
Jonathan Brassowc1084562011-08-02 12:32:07 +0100897
Mike Snitzerbd83a4c2016-05-31 14:26:52 -0400898 if (region_size < rs->md.chunk_sectors) {
899 rs->ti->error = "Region size is smaller than the chunk size";
900 return -EINVAL;
901 }
Jonathan Brassowc1084562011-08-02 12:32:07 +0100902 }
903
904 /*
905 * Convert sectors to bytes.
906 */
907 rs->md.bitmap_info.chunksize = (region_size << 9);
908
909 return 0;
910}
911
912/*
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600913 * validate_raid_redundancy
Jonathan Brassoweb649122012-10-11 13:40:09 +1100914 * @rs
915 *
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600916 * Determine if there are enough devices in the array that haven't
917 * failed (or are being rebuilt) to form a usable array.
Jonathan Brassoweb649122012-10-11 13:40:09 +1100918 *
919 * Returns: 0 on success, -EINVAL on failure.
920 */
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600921static int validate_raid_redundancy(struct raid_set *rs)
Jonathan Brassoweb649122012-10-11 13:40:09 +1100922{
923 unsigned i, rebuild_cnt = 0;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200924 unsigned rebuilds_per_group = 0, copies;
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100925 unsigned group_size, last_group_start;
Jonathan Brassoweb649122012-10-11 13:40:09 +1100926
Jonathan Brassoweb649122012-10-11 13:40:09 +1100927 for (i = 0; i < rs->md.raid_disks; i++)
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600928 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
929 !rs->dev[i].rdev.sb_page)
Jonathan Brassoweb649122012-10-11 13:40:09 +1100930 rebuild_cnt++;
931
932 switch (rs->raid_type->level) {
933 case 1:
934 if (rebuild_cnt >= rs->md.raid_disks)
935 goto too_many;
936 break;
937 case 4:
938 case 5:
939 case 6:
940 if (rebuild_cnt > rs->raid_type->parity_devs)
941 goto too_many;
942 break;
943 case 10:
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200944 copies = raid10_md_layout_to_copies(rs->md.new_layout);
Jonathan Brassow4ec1e362012-10-11 13:40:24 +1100945 if (rebuild_cnt < copies)
946 break;
947
948 /*
949 * It is possible to have a higher rebuild count for RAID10,
950 * as long as the failed devices occur in different mirror
951 * groups (i.e. different stripes).
952 *
Jonathan Brassow4ec1e362012-10-11 13:40:24 +1100953 * When checking "near" format, make sure no adjacent devices
954 * have failed beyond what can be handled. In addition to the
955 * simple case where the number of devices is a multiple of the
956 * number of copies, we must also handle cases where the number
957 * of devices is not a multiple of the number of copies.
Mike Snitzer43157842016-05-30 13:03:37 -0400958 * E.g. dev1 dev2 dev3 dev4 dev5
959 * A A B B C
960 * C D D E E
Jonathan Brassow4ec1e362012-10-11 13:40:24 +1100961 */
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200962 if (__is_raid10_near(rs->md.new_layout)) {
963 for (i = 0; i < rs->raid_disks; i++) {
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100964 if (!(i % copies))
965 rebuilds_per_group = 0;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +0200966 if ((!rs->dev[i].rdev.sb_page ||
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +0200967 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100968 (++rebuilds_per_group >= copies))
969 goto too_many;
970 }
971 break;
972 }
973
974 /*
975 * When checking "far" and "offset" formats, we need to ensure
976 * that the device that holds its copy is not also dead or
977 * being rebuilt. (Note that "far" and "offset" formats only
978 * support two copies right now. These formats also only ever
979 * use the 'use_far_sets' variant.)
980 *
981 * This check is somewhat complicated by the need to account
Mike Snitzer43157842016-05-30 13:03:37 -0400982 * for arrays that are not a multiple of (far) copies. This
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100983 * results in the need to treat the last (potentially larger)
984 * set differently.
985 */
986 group_size = (rs->md.raid_disks / copies);
987 last_group_start = (rs->md.raid_disks / group_size) - 1;
988 last_group_start *= group_size;
989 for (i = 0; i < rs->md.raid_disks; i++) {
990 if (!(i % copies) && !(i > last_group_start))
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600991 rebuilds_per_group = 0;
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100992 if ((!rs->dev[i].rdev.sb_page ||
993 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
Jonathan Brassow4ec1e362012-10-11 13:40:24 +1100994 (++rebuilds_per_group >= copies))
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +1100995 goto too_many;
Jonathan Brassow4ec1e362012-10-11 13:40:24 +1100996 }
997 break;
Jonathan Brassoweb649122012-10-11 13:40:09 +1100998 default:
Jonathan Brassow55ebbb52013-01-22 21:42:18 -0600999 if (rebuild_cnt)
1000 return -EINVAL;
Jonathan Brassoweb649122012-10-11 13:40:09 +11001001 }
1002
1003 return 0;
1004
1005too_many:
Jonathan Brassoweb649122012-10-11 13:40:09 +11001006 return -EINVAL;
1007}
1008
1009/*
NeilBrown9d09e662011-01-13 20:00:02 +00001010 * Possible arguments are...
NeilBrown9d09e662011-01-13 20:00:02 +00001011 * <chunk_size> [optional_args]
1012 *
Jonathan Brassow32737272011-08-02 12:32:07 +01001013 * Argument definitions
1014 * <chunk_size> The number of sectors per disk that
Mike Snitzer43157842016-05-30 13:03:37 -04001015 * will form the "stripe"
Jonathan Brassow32737272011-08-02 12:32:07 +01001016 * [[no]sync] Force or prevent recovery of the
Mike Snitzer43157842016-05-30 13:03:37 -04001017 * entire array
NeilBrown9d09e662011-01-13 20:00:02 +00001018 * [rebuild <idx>] Rebuild the drive indicated by the index
Jonathan Brassow32737272011-08-02 12:32:07 +01001019 * [daemon_sleep <ms>] Time between bitmap daemon work to
Mike Snitzer43157842016-05-30 13:03:37 -04001020 * clear bits
NeilBrown9d09e662011-01-13 20:00:02 +00001021 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1022 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
Jonathan Brassow46bed2b2011-08-02 12:32:07 +01001023 * [write_mostly <idx>] Indicate a write mostly drive via index
NeilBrown9d09e662011-01-13 20:00:02 +00001024 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
1025 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
Mike Snitzer43157842016-05-30 13:03:37 -04001026 * [region_size <sectors>] Defines granularity of bitmap
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001027 *
1028 * RAID10-only options:
Mike Snitzer43157842016-05-30 13:03:37 -04001029 * [raid10_copies <# copies>] Number of copies. (Default: 2)
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +11001030 * [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
NeilBrown9d09e662011-01-13 20:00:02 +00001031 */
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02001032static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
NeilBrown9d09e662011-01-13 20:00:02 +00001033 unsigned num_raid_params)
1034{
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001035 int value, raid10_format = ALGORITHM_RAID10_DEFAULT;
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001036 unsigned raid10_copies = 2;
Heinz Mauelshagen5fa146b2016-06-15 18:50:18 +02001037 unsigned i, write_mostly = 0;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001038 unsigned region_size = 0;
Mike Snitzer542f9032012-07-27 15:08:00 +01001039 sector_t max_io_len;
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02001040 const char *arg, *key;
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001041 struct raid_dev *rd;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001042 struct raid_type *rt = rs->raid_type;
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02001043
1044 arg = dm_shift_arg(as);
1045 num_raid_params--; /* Account for chunk_size argument */
1046
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001047 if (kstrtoint(arg, 10, &value) < 0) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001048 rs->ti->error = "Bad numerical argument given for chunk_size";
1049 return -EINVAL;
1050 }
NeilBrown9d09e662011-01-13 20:00:02 +00001051
1052 /*
1053 * First, parse the in-order required arguments
Jonathan Brassow32737272011-08-02 12:32:07 +01001054 * "chunk_size" is the only argument of this type.
NeilBrown9d09e662011-01-13 20:00:02 +00001055 */
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001056 if (rt_is_raid1(rt)) {
Jonathan Brassow32737272011-08-02 12:32:07 +01001057 if (value)
1058 DMERR("Ignoring chunk size parameter for RAID 1");
1059 value = 0;
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001060 } else if (!is_power_of_2(value)) {
1061 rs->ti->error = "Chunk size must be a power of 2";
1062 return -EINVAL;
1063 } else if (value < 8) {
1064 rs->ti->error = "Chunk size value is too small";
1065 return -EINVAL;
1066 }
NeilBrown9d09e662011-01-13 20:00:02 +00001067
1068 rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
NeilBrown9d09e662011-01-13 20:00:02 +00001069
1070 /*
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001071 * We set each individual device as In_sync with a completed
1072 * 'recovery_offset'. If there has been a device failure or
1073 * replacement then one of the following cases applies:
1074 *
1075 * 1) User specifies 'rebuild'.
Mike Snitzer43157842016-05-30 13:03:37 -04001076 * - Device is reset when param is read.
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001077 * 2) A new device is supplied.
Mike Snitzer43157842016-05-30 13:03:37 -04001078 * - No matching superblock found, resets device.
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001079 * 3) Device failure was transient and returns on reload.
Mike Snitzer43157842016-05-30 13:03:37 -04001080 * - Failure noticed, resets device for bitmap replay.
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001081 * 4) Device hadn't completed recovery after previous failure.
Mike Snitzer43157842016-05-30 13:03:37 -04001082 * - Superblock is read and overrides recovery_offset.
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001083 *
1084 * What is found in the superblocks of the devices is always
1085 * authoritative, unless 'rebuild' or '[no]sync' was specified.
1086 */
1087 for (i = 0; i < rs->md.raid_disks; i++) {
1088 set_bit(In_sync, &rs->dev[i].rdev.flags);
1089 rs->dev[i].rdev.recovery_offset = MaxSector;
1090 }
1091
1092 /*
NeilBrown9d09e662011-01-13 20:00:02 +00001093 * Second, parse the unordered optional arguments
1094 */
NeilBrown9d09e662011-01-13 20:00:02 +00001095 for (i = 0; i < num_raid_params; i++) {
Heinz Mauelshagen4763e542016-05-19 18:49:31 +02001096 key = dm_shift_arg(as);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001097 if (!key) {
1098 rs->ti->error = "Not enough raid parameters given";
1099 return -EINVAL;
1100 }
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02001101
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001102 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001103 if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001104 rs->ti->error = "Only one 'nosync' argument allowed";
1105 return -EINVAL;
1106 }
NeilBrown9d09e662011-01-13 20:00:02 +00001107 continue;
1108 }
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001109 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001110 if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001111 rs->ti->error = "Only one 'sync' argument allowed";
1112 return -EINVAL;
1113 }
Heinz Mauelshagen4763e542016-05-19 18:49:31 +02001114 continue;
1115 }
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001116 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001117 if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001118 rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed";
1119 return -EINVAL;
1120 }
NeilBrown9d09e662011-01-13 20:00:02 +00001121 continue;
1122 }
1123
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02001124 arg = dm_shift_arg(as);
1125 i++; /* Account for the argument pairs */
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001126 if (!arg) {
1127 rs->ti->error = "Wrong number of raid parameters given";
1128 return -EINVAL;
1129 }
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001130
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001131 /*
1132 * Parameters that take a string value are checked here.
1133 */
1134
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001135 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001136 if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001137 rs->ti->error = "Only one 'raid10_format' argument pair allowed";
1138 return -EINVAL;
1139 }
1140 if (!rt_is_raid10(rt)) {
1141 rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
1142 return -EINVAL;
1143 }
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001144 raid10_format = raid10_name_to_format(arg);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001145 if (raid10_format < 0) {
1146 rs->ti->error = "Invalid 'raid10_format' value given";
1147 return raid10_format;
1148 }
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001149 continue;
1150 }
1151
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001152 if (kstrtoint(arg, 10, &value) < 0) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001153 rs->ti->error = "Bad numerical argument given in raid params";
1154 return -EINVAL;
1155 }
NeilBrown9d09e662011-01-13 20:00:02 +00001156
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001157 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) {
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001158 /*
1159 * "rebuild" is being passed in by userspace to provide
1160 * indexes of replaced devices and to set up additional
1161 * devices on raid level takeover.
Mike Snitzer43157842016-05-30 13:03:37 -04001162 */
Mike Snitzerbb91a632016-06-02 12:06:54 -04001163 if (!__within_range(value, 0, rs->raid_disks - 1)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001164 rs->ti->error = "Invalid rebuild index given";
1165 return -EINVAL;
1166 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001167
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001168 if (test_and_set_bit(value, (void *) rs->rebuild_disks)) {
1169 rs->ti->error = "rebuild for this index already given";
1170 return -EINVAL;
1171 }
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001172
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001173 rd = rs->dev + value;
1174 clear_bit(In_sync, &rd->rdev.flags);
1175 clear_bit(Faulty, &rd->rdev.flags);
1176 rd->rdev.recovery_offset = 0;
Mike Snitzer42863252016-06-02 12:27:46 -04001177 set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags);
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001178 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001179 if (!rt_is_raid1(rt)) {
1180 rs->ti->error = "write_mostly option is only valid for RAID1";
1181 return -EINVAL;
1182 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001183
Mike Snitzerbb91a632016-06-02 12:06:54 -04001184 if (!__within_range(value, 0, rs->md.raid_disks - 1)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001185 rs->ti->error = "Invalid write_mostly index given";
1186 return -EINVAL;
1187 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001188
Heinz Mauelshagen5fa146b2016-06-15 18:50:18 +02001189 write_mostly++;
Jonathan Brassow46bed2b2011-08-02 12:32:07 +01001190 set_bit(WriteMostly, &rs->dev[value].rdev.flags);
Mike Snitzer42863252016-06-02 12:27:46 -04001191 set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags);
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001192 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001193 if (!rt_is_raid1(rt)) {
1194 rs->ti->error = "max_write_behind option is only valid for RAID1";
1195 return -EINVAL;
1196 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001197
Mike Snitzer42863252016-06-02 12:27:46 -04001198 if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001199 rs->ti->error = "Only one max_write_behind argument pair allowed";
1200 return -EINVAL;
1201 }
NeilBrown9d09e662011-01-13 20:00:02 +00001202
1203 /*
1204 * In device-mapper, we specify things in sectors, but
1205 * MD records this value in kB
1206 */
1207 value /= 2;
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001208 if (value > COUNTER_MAX) {
1209 rs->ti->error = "Max write-behind limit out of range";
1210 return -EINVAL;
1211 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001212
NeilBrown9d09e662011-01-13 20:00:02 +00001213 rs->md.bitmap_info.max_write_behind = value;
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001214 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001215 if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001216 rs->ti->error = "Only one daemon_sleep argument pair allowed";
1217 return -EINVAL;
1218 }
1219 if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
1220 rs->ti->error = "daemon sleep period out of range";
1221 return -EINVAL;
1222 }
NeilBrown9d09e662011-01-13 20:00:02 +00001223 rs->md.bitmap_info.daemon_sleep = value;
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001224 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) {
Heinz Mauelshagen4763e542016-05-19 18:49:31 +02001225 /* Userspace passes new data_offset after having extended the the data image LV */
Mike Snitzer42863252016-06-02 12:27:46 -04001226 if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001227 rs->ti->error = "Only one data_offset argument pair allowed";
1228 return -EINVAL;
1229 }
Heinz Mauelshagen4763e542016-05-19 18:49:31 +02001230 /* Ensure sensible data offset */
Heinz Mauelshagen75dd3b92016-06-15 22:27:08 +02001231 if (value < 0 ||
1232 (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001233 rs->ti->error = "Bogus data_offset value";
1234 return -EINVAL;
1235 }
Heinz Mauelshagen4763e542016-05-19 18:49:31 +02001236 rs->data_offset = value;
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001237 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) {
Heinz Mauelshagen4763e542016-05-19 18:49:31 +02001238 /* Define the +/-# of disks to add to/remove from the given raid set */
Mike Snitzer42863252016-06-02 12:27:46 -04001239 if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001240 rs->ti->error = "Only one delta_disks argument pair allowed";
1241 return -EINVAL;
1242 }
Heinz Mauelshagen4763e542016-05-19 18:49:31 +02001243 /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */
Mike Snitzerbb91a632016-06-02 12:06:54 -04001244 if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001245 rs->ti->error = "Too many delta_disk requested";
1246 return -EINVAL;
1247 }
Heinz Mauelshagen4763e542016-05-19 18:49:31 +02001248
1249 rs->delta_disks = value;
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001250 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001251 if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001252 rs->ti->error = "Only one stripe_cache argument pair allowed";
1253 return -EINVAL;
1254 }
1255
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001256 if (!rt_is_raid456(rt)) {
1257 rs->ti->error = "Inappropriate argument: stripe_cache";
1258 return -EINVAL;
1259 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001260
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001261 rs->stripe_cache_entries = value;
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001262 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001263 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001264 rs->ti->error = "Only one min_recovery_rate argument pair allowed";
1265 return -EINVAL;
1266 }
1267 if (value > INT_MAX) {
1268 rs->ti->error = "min_recovery_rate out of range";
1269 return -EINVAL;
1270 }
NeilBrown9d09e662011-01-13 20:00:02 +00001271 rs->md.sync_speed_min = (int)value;
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001272 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001273 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001274 rs->ti->error = "Only one max_recovery_rate argument pair allowed";
1275 return -EINVAL;
1276 }
1277 if (value > INT_MAX) {
1278 rs->ti->error = "max_recovery_rate out of range";
1279 return -EINVAL;
1280 }
NeilBrown9d09e662011-01-13 20:00:02 +00001281 rs->md.sync_speed_max = (int)value;
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001282 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001283 if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001284 rs->ti->error = "Only one region_size argument pair allowed";
1285 return -EINVAL;
1286 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001287
Jonathan Brassowc1084562011-08-02 12:32:07 +01001288 region_size = value;
Heinz Mauelshagen4257e082016-06-14 01:46:03 +02001289 rs->requested_bitmap_chunk_sectors = value;
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04001290 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) {
Mike Snitzer42863252016-06-02 12:27:46 -04001291 if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001292 rs->ti->error = "Only one raid10_copies argument pair allowed";
1293 return -EINVAL;
1294 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001295
Mike Snitzerbb91a632016-06-02 12:06:54 -04001296 if (!__within_range(value, 2, rs->md.raid_disks)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001297 rs->ti->error = "Bad value for 'raid10_copies'";
1298 return -EINVAL;
1299 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001300
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001301 raid10_copies = value;
NeilBrown9d09e662011-01-13 20:00:02 +00001302 } else {
1303 DMERR("Unable to parse RAID parameter: %s", key);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001304 rs->ti->error = "Unable to parse RAID parameter";
1305 return -EINVAL;
NeilBrown9d09e662011-01-13 20:00:02 +00001306 }
1307 }
1308
Heinz Mauelshagen0d851d12016-06-15 18:43:55 +02001309 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) &&
1310 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1311 rs->ti->error = "sync and nosync are mutually exclusive";
1312 return -EINVAL;
1313 }
1314
Heinz Mauelshagen37f10be2016-06-24 23:21:37 +02001315 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) &&
1316 (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ||
1317 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))) {
1318 rs->ti->error = "sync/nosync and rebuild are mutually exclusive";
1319 return -EINVAL;
1320 }
1321
Heinz Mauelshagen5fa146b2016-06-15 18:50:18 +02001322 if (write_mostly >= rs->md.raid_disks) {
1323 rs->ti->error = "Can't set all raid1 devices to write_mostly";
1324 return -EINVAL;
1325 }
1326
Jonathan Brassowc1084562011-08-02 12:32:07 +01001327 if (validate_region_size(rs, region_size))
1328 return -EINVAL;
1329
1330 if (rs->md.chunk_sectors)
Mike Snitzer542f9032012-07-27 15:08:00 +01001331 max_io_len = rs->md.chunk_sectors;
Jonathan Brassowc1084562011-08-02 12:32:07 +01001332 else
Mike Snitzer542f9032012-07-27 15:08:00 +01001333 max_io_len = region_size;
Jonathan Brassowc1084562011-08-02 12:32:07 +01001334
Mike Snitzer542f9032012-07-27 15:08:00 +01001335 if (dm_set_target_max_io_len(rs->ti, max_io_len))
1336 return -EINVAL;
Jonathan Brassow32737272011-08-02 12:32:07 +01001337
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001338 if (rt_is_raid10(rt)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001339 if (raid10_copies > rs->md.raid_disks) {
1340 rs->ti->error = "Not enough devices to satisfy specification";
1341 return -EINVAL;
1342 }
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05001343
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001344 rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001345 if (rs->md.new_layout < 0) {
1346 rs->ti->error = "Error getting raid10 format";
1347 return rs->md.new_layout;
1348 }
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001349
1350 rt = get_raid_type_by_ll(10, rs->md.new_layout);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001351 if (!rt) {
1352 rs->ti->error = "Failed to recognize new raid10 layout";
1353 return -EINVAL;
1354 }
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001355
1356 if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT ||
1357 rt->algorithm == ALGORITHM_RAID10_NEAR) &&
Mike Snitzer42863252016-06-02 12:27:46 -04001358 test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001359 rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible";
1360 return -EINVAL;
1361 }
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001362 }
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02001363
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001364 rs->raid10_copies = raid10_copies;
Jonathan E Brassowc039c332012-07-27 15:08:04 +01001365
NeilBrown9d09e662011-01-13 20:00:02 +00001366 /* Assume there are no metadata devices until the drives are parsed */
1367 rs->md.persistent = 0;
1368 rs->md.external = 1;
1369
Heinz Mauelshagenf0902792016-05-19 18:49:27 +02001370 /* Check, if any invalid ctr arguments have been passed in for the raid level */
Heinz Mauelshagena30cbc02016-06-09 16:42:16 +02001371 return rs_check_for_valid_flags(rs);
NeilBrown9d09e662011-01-13 20:00:02 +00001372}
1373
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001374/* Set raid4/5/6 cache size */
1375static int rs_set_raid456_stripe_cache(struct raid_set *rs)
1376{
1377 int r;
1378 struct r5conf *conf;
1379 struct mddev *mddev = &rs->md;
1380 uint32_t min_stripes = max(mddev->chunk_sectors, mddev->new_chunk_sectors) / 2;
1381 uint32_t nr_stripes = rs->stripe_cache_entries;
1382
1383 if (!rt_is_raid456(rs->raid_type)) {
1384 rs->ti->error = "Inappropriate raid level; cannot change stripe_cache size";
1385 return -EINVAL;
1386 }
1387
1388 if (nr_stripes < min_stripes) {
1389 DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size",
1390 nr_stripes, min_stripes);
1391 nr_stripes = min_stripes;
1392 }
1393
1394 conf = mddev->private;
1395 if (!conf) {
1396 rs->ti->error = "Cannot change stripe_cache size on inactive RAID set";
1397 return -EINVAL;
1398 }
1399
1400 /* Try setting number of stripes in raid456 stripe cache */
1401 if (conf->min_nr_stripes != nr_stripes) {
1402 r = raid5_set_cache_size(mddev, nr_stripes);
1403 if (r) {
1404 rs->ti->error = "Failed to set raid4/5/6 stripe cache size";
1405 return r;
1406 }
1407
1408 DMINFO("%u stripe cache entries", nr_stripes);
1409 }
1410
1411 return 0;
1412}
1413
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02001414/* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */
1415static unsigned int mddev_data_stripes(struct raid_set *rs)
1416{
1417 return rs->md.raid_disks - rs->raid_type->parity_devs;
1418}
1419
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02001420/* Return # of data stripes of @rs (i.e. as of ctr) */
1421static unsigned int rs_data_stripes(struct raid_set *rs)
1422{
1423 return rs->raid_disks - rs->raid_type->parity_devs;
1424}
1425
1426/* Calculate the sectors per device and per array used for @rs */
1427static int rs_set_dev_and_array_sectors(struct raid_set *rs, bool use_mddev)
1428{
1429 int delta_disks;
1430 unsigned int data_stripes;
1431 struct mddev *mddev = &rs->md;
1432 struct md_rdev *rdev;
1433 sector_t array_sectors = rs->ti->len, dev_sectors = rs->ti->len;
1434
1435 if (use_mddev) {
1436 delta_disks = mddev->delta_disks;
1437 data_stripes = mddev_data_stripes(rs);
1438 } else {
1439 delta_disks = rs->delta_disks;
1440 data_stripes = rs_data_stripes(rs);
1441 }
1442
1443 /* Special raid1 case w/o delta_disks support (yet) */
1444 if (rt_is_raid1(rs->raid_type))
1445 ;
1446 else if (rt_is_raid10(rs->raid_type)) {
1447 if (rs->raid10_copies < 2 ||
1448 delta_disks < 0) {
1449 rs->ti->error = "Bogus raid10 data copies or delta disks";
1450 return EINVAL;
1451 }
1452
1453 dev_sectors *= rs->raid10_copies;
1454 if (sector_div(dev_sectors, data_stripes))
1455 goto bad;
1456
1457 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1458 if (sector_div(array_sectors, rs->raid10_copies))
1459 goto bad;
1460
1461 } else if (sector_div(dev_sectors, data_stripes))
1462 goto bad;
1463
1464 else
1465 /* Striped layouts */
1466 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1467
1468 rdev_for_each(rdev, mddev)
1469 rdev->sectors = dev_sectors;
1470
1471 mddev->array_sectors = array_sectors;
1472 mddev->dev_sectors = dev_sectors;
1473
1474 return 0;
1475bad:
1476 rs->ti->error = "Target length not divisible by number of data devices";
1477 return EINVAL;
1478}
1479
Heinz Mauelshagen4dff2f12016-06-24 00:21:09 +02001480/* Setup recovery on @rs */
1481static void __rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1482{
1483 /* raid0 does not recover */
1484 if (rs_is_raid0(rs))
1485 rs->md.recovery_cp = MaxSector;
1486 /*
1487 * A raid6 set has to be recovered either
1488 * completely or for the grown part to
1489 * ensure proper parity and Q-Syndrome
1490 */
1491 else if (rs_is_raid6(rs))
1492 rs->md.recovery_cp = dev_sectors;
1493 /*
1494 * Other raid set types may skip recovery
1495 * depending on the 'nosync' flag.
1496 */
1497 else
1498 rs->md.recovery_cp = test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)
1499 ? MaxSector : dev_sectors;
1500}
1501
1502/* Setup recovery on @rs based on raid type, device size and 'nosync' flag */
1503static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors)
1504{
1505 if (!dev_sectors)
1506 /* New raid set or 'sync' flag provided */
1507 __rs_setup_recovery(rs, 0);
1508 else if (dev_sectors == MaxSector)
1509 /* Prevent recovery */
1510 __rs_setup_recovery(rs, MaxSector);
1511 else if (rs->dev[0].rdev.sectors < dev_sectors)
1512 /* Grown raid set */
1513 __rs_setup_recovery(rs, rs->dev[0].rdev.sectors);
1514 else
1515 __rs_setup_recovery(rs, MaxSector);
1516}
1517
NeilBrown9d09e662011-01-13 20:00:02 +00001518static void do_table_event(struct work_struct *ws)
1519{
1520 struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
1521
Heinz Mauelshagen9d9d9392016-06-16 03:15:49 +02001522 smp_rmb(); /* Make sure we access most actual mddev properties */
1523 if (!rs_is_reshaping(rs))
1524 rs_set_capacity(rs);
NeilBrown9d09e662011-01-13 20:00:02 +00001525 dm_table_event(rs->ti->table);
1526}
1527
1528static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
1529{
1530 struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
1531
NeilBrown5c675f82014-12-15 12:56:56 +11001532 return mddev_congested(&rs->md, bits);
NeilBrown9d09e662011-01-13 20:00:02 +00001533}
1534
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001535/*
1536 * Make sure a valid takover (level switch) is being requested on @rs
1537 *
1538 * Conversions of raid sets from one MD personality to another
1539 * have to conform to restrictions which are enforced here.
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001540 */
1541static int rs_check_takeover(struct raid_set *rs)
1542{
1543 struct mddev *mddev = &rs->md;
1544 unsigned int near_copies;
1545
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001546 if (rs->md.degraded) {
1547 rs->ti->error = "Can't takeover degraded raid set";
1548 return -EPERM;
1549 }
1550
1551 if (rs_is_reshaping(rs)) {
1552 rs->ti->error = "Can't takeover reshaping raid set";
1553 return -EPERM;
1554 }
1555
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001556 switch (mddev->level) {
1557 case 0:
1558 /* raid0 -> raid1/5 with one disk */
1559 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1560 mddev->raid_disks == 1)
1561 return 0;
1562
1563 /* raid0 -> raid10 */
1564 if (mddev->new_level == 10 &&
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001565 !(rs->raid_disks % mddev->raid_disks))
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001566 return 0;
1567
1568 /* raid0 with multiple disks -> raid4/5/6 */
Mike Snitzerbb91a632016-06-02 12:06:54 -04001569 if (__within_range(mddev->new_level, 4, 6) &&
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001570 mddev->new_layout == ALGORITHM_PARITY_N &&
1571 mddev->raid_disks > 1)
1572 return 0;
1573
1574 break;
1575
1576 case 10:
1577 /* Can't takeover raid10_offset! */
Mike Snitzere6ca5e12016-06-02 15:27:22 -04001578 if (__is_raid10_offset(mddev->layout))
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001579 break;
1580
Mike Snitzere6ca5e12016-06-02 15:27:22 -04001581 near_copies = __raid10_near_copies(mddev->layout);
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001582
1583 /* raid10* -> raid0 */
1584 if (mddev->new_level == 0) {
1585 /* Can takeover raid10_near with raid disks divisable by data copies! */
1586 if (near_copies > 1 &&
1587 !(mddev->raid_disks % near_copies)) {
1588 mddev->raid_disks /= near_copies;
1589 mddev->delta_disks = mddev->raid_disks;
1590 return 0;
1591 }
1592
1593 /* Can takeover raid10_far */
1594 if (near_copies == 1 &&
Mike Snitzere6ca5e12016-06-02 15:27:22 -04001595 __raid10_far_copies(mddev->layout) > 1)
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001596 return 0;
1597
1598 break;
1599 }
1600
1601 /* raid10_{near,far} -> raid1 */
1602 if (mddev->new_level == 1 &&
Mike Snitzere6ca5e12016-06-02 15:27:22 -04001603 max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks)
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001604 return 0;
1605
1606 /* raid10_{near,far} with 2 disks -> raid4/5 */
Mike Snitzerbb91a632016-06-02 12:06:54 -04001607 if (__within_range(mddev->new_level, 4, 5) &&
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001608 mddev->raid_disks == 2)
1609 return 0;
1610 break;
1611
1612 case 1:
1613 /* raid1 with 2 disks -> raid4/5 */
Mike Snitzerbb91a632016-06-02 12:06:54 -04001614 if (__within_range(mddev->new_level, 4, 5) &&
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001615 mddev->raid_disks == 2) {
1616 mddev->degraded = 1;
1617 return 0;
1618 }
1619
1620 /* raid1 -> raid0 */
1621 if (mddev->new_level == 0 &&
1622 mddev->raid_disks == 1)
1623 return 0;
1624
1625 /* raid1 -> raid10 */
1626 if (mddev->new_level == 10)
1627 return 0;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001628 break;
1629
1630 case 4:
1631 /* raid4 -> raid0 */
1632 if (mddev->new_level == 0)
1633 return 0;
1634
1635 /* raid4 -> raid1/5 with 2 disks */
1636 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1637 mddev->raid_disks == 2)
1638 return 0;
1639
1640 /* raid4 -> raid5/6 with parity N */
Mike Snitzerbb91a632016-06-02 12:06:54 -04001641 if (__within_range(mddev->new_level, 5, 6) &&
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001642 mddev->layout == ALGORITHM_PARITY_N)
1643 return 0;
1644 break;
1645
1646 case 5:
1647 /* raid5 with parity N -> raid0 */
1648 if (mddev->new_level == 0 &&
1649 mddev->layout == ALGORITHM_PARITY_N)
1650 return 0;
1651
1652 /* raid5 with parity N -> raid4 */
1653 if (mddev->new_level == 4 &&
1654 mddev->layout == ALGORITHM_PARITY_N)
1655 return 0;
1656
1657 /* raid5 with 2 disks -> raid1/4/10 */
1658 if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) &&
1659 mddev->raid_disks == 2)
1660 return 0;
1661
Heinz Mauelshagen6ee0bae2016-06-15 22:29:09 +02001662 /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001663 if (mddev->new_level == 6 &&
1664 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
Mike Snitzerbb91a632016-06-02 12:06:54 -04001665 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6)))
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001666 return 0;
1667 break;
1668
1669 case 6:
1670 /* raid6 with parity N -> raid0 */
1671 if (mddev->new_level == 0 &&
1672 mddev->layout == ALGORITHM_PARITY_N)
1673 return 0;
1674
1675 /* raid6 with parity N -> raid4 */
1676 if (mddev->new_level == 4 &&
1677 mddev->layout == ALGORITHM_PARITY_N)
1678 return 0;
1679
Heinz Mauelshagen6ee0bae2016-06-15 22:29:09 +02001680 /* raid6_*_n with Q-Syndrome N -> raid5_* */
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001681 if (mddev->new_level == 5 &&
1682 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
Mike Snitzerbb91a632016-06-02 12:06:54 -04001683 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC)))
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001684 return 0;
1685
1686 default:
1687 break;
1688 }
1689
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04001690 rs->ti->error = "takeover not possible";
1691 return -EINVAL;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02001692}
1693
1694/* True if @rs requested to be taken over */
1695static bool rs_takeover_requested(struct raid_set *rs)
1696{
1697 return rs->md.new_level != rs->md.level;
1698}
1699
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02001700/* True if @rs is requested to reshape by ctr */
1701static bool rs_reshape_requested(struct raid_set *rs)
1702{
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02001703 bool change;
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02001704 struct mddev *mddev = &rs->md;
1705
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02001706 if (rs_takeover_requested(rs))
1707 return false;
1708
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02001709 if (!mddev->level)
1710 return false;
1711
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02001712 change = mddev->new_layout != mddev->layout ||
1713 mddev->new_chunk_sectors != mddev->chunk_sectors ||
1714 rs->delta_disks;
1715
1716 /* Historical case to support raid1 reshape without delta disks */
1717 if (mddev->level == 1)
1718 return !change &&
1719 mddev->raid_disks != rs->raid_disks;
1720
1721 if (mddev->level == 10)
1722 return change &&
1723 !__is_raid10_far(mddev->new_layout) &&
1724 rs->delta_disks >= 0;
1725
1726 return change;
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02001727}
1728
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001729/* Features */
Mike Snitzer9b6e5422016-06-02 11:48:09 -04001730#define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001731
1732/* State flags for sb->flags */
1733#define SB_FLAG_RESHAPE_ACTIVE 0x1
1734#define SB_FLAG_RESHAPE_BACKWARDS 0x2
1735
NeilBrown9d09e662011-01-13 20:00:02 +00001736/*
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001737 * This structure is never routinely used by userspace, unlike md superblocks.
1738 * Devices with this superblock should only ever be accessed via device-mapper.
1739 */
1740#define DM_RAID_MAGIC 0x64526D44
1741struct dm_raid_superblock {
1742 __le32 magic; /* "DmRd" */
Mike Snitzer9b6e5422016-06-02 11:48:09 -04001743 __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001744
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001745 __le32 num_devices; /* Number of devices in this raid set. (Max 64) */
1746 __le32 array_position; /* The position of this drive in the raid set */
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001747
1748 __le64 events; /* Incremented by md when superblock updated */
Mike Snitzer9b6e5422016-06-02 11:48:09 -04001749 __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001750 /* indicate failures (see extension below) */
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001751
1752 /*
1753 * This offset tracks the progress of the repair or replacement of
1754 * an individual drive.
1755 */
1756 __le64 disk_recovery_offset;
1757
1758 /*
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001759 * This offset tracks the progress of the initial raid set
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001760 * synchronisation/parity calculation.
1761 */
1762 __le64 array_resync_offset;
1763
1764 /*
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001765 * raid characteristics
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001766 */
1767 __le32 level;
1768 __le32 layout;
1769 __le32 stripe_sectors;
1770
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001771 /********************************************************************
Mike Snitzer9b6e5422016-06-02 11:48:09 -04001772 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001773 *
Mike Snitzer9b6e5422016-06-02 11:48:09 -04001774 * FEATURE_FLAG_SUPPORTS_V190 in the features member indicates that those exist
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001775 */
1776
1777 __le32 flags; /* Flags defining array states for reshaping */
1778
1779 /*
1780 * This offset tracks the progress of a raid
1781 * set reshape in order to be able to restart it
1782 */
1783 __le64 reshape_position;
1784
1785 /*
1786 * These define the properties of the array in case of an interrupted reshape
1787 */
1788 __le32 new_level;
1789 __le32 new_layout;
1790 __le32 new_stripe_sectors;
1791 __le32 delta_disks;
1792
1793 __le64 array_sectors; /* Array size in sectors */
1794
1795 /*
1796 * Sector offsets to data on devices (reshaping).
1797 * Needed to support out of place reshaping, thus
1798 * not writing over any stripes whilst converting
1799 * them from old to new layout
1800 */
1801 __le64 data_offset;
1802 __le64 new_data_offset;
1803
1804 __le64 sectors; /* Used device size in sectors */
1805
1806 /*
1807 * Additonal Bit field of devices indicating failures to support
Mike Snitzer9b6e5422016-06-02 11:48:09 -04001808 * up to 256 devices with the 1.9.0 on-disk metadata format
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001809 */
1810 __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1];
1811
1812 __le32 incompat_features; /* Used to indicate any incompatible features */
1813
1814 /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001815} __packed;
1816
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001817/*
1818 * Check for reshape constraints on raid set @rs:
1819 *
1820 * - reshape function non-existent
1821 * - degraded set
1822 * - ongoing recovery
1823 * - ongoing reshape
1824 *
1825 * Returns 0 if none or -EPERM if given constraint
1826 * and error message reference in @errmsg
1827 */
1828static int rs_check_reshape(struct raid_set *rs)
1829{
1830 struct mddev *mddev = &rs->md;
1831
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001832 if (!mddev->pers || !mddev->pers->check_reshape)
1833 rs->ti->error = "Reshape not supported";
1834 else if (mddev->degraded)
1835 rs->ti->error = "Can't reshape degraded raid set";
1836 else if (rs_is_recovering(rs))
1837 rs->ti->error = "Convert request on recovering raid set prohibited";
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02001838 else if (rs_is_reshaping(rs))
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02001839 rs->ti->error = "raid set already reshaping!";
1840 else if (!(rs_is_raid10(rs) || rs_is_raid456(rs)))
1841 rs->ti->error = "Reshaping only supported for raid4/5/6/10";
1842 else
1843 return 0;
1844
1845 return -EPERM;
1846}
1847
NeilBrown3cb03002011-10-11 16:45:26 +11001848static int read_disk_sb(struct md_rdev *rdev, int size)
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001849{
1850 BUG_ON(!rdev->sb_page);
1851
1852 if (rdev->sb_loaded)
1853 return 0;
1854
Heinz Mauelshagen0a7b8182016-06-15 18:45:56 +02001855 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) {
Jonathan E Brassow04475682012-03-28 18:41:26 +01001856 DMERR("Failed to read superblock of device at position %d",
1857 rdev->raid_disk);
Jonathan Brassowc32fb9e2012-05-22 13:55:31 +10001858 md_error(rdev->mddev, rdev);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001859 return -EINVAL;
1860 }
1861
1862 rdev->sb_loaded = 1;
1863
1864 return 0;
1865}
1866
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001867static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
1868{
1869 failed_devices[0] = le64_to_cpu(sb->failed_devices);
1870 memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices));
1871
Mike Snitzer42863252016-06-02 12:27:46 -04001872 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02001873 int i = ARRAY_SIZE(sb->extended_failed_devices);
1874
1875 while (i--)
1876 failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]);
1877 }
1878}
1879
Heinz Mauelshagen7b34df72016-05-19 18:49:32 +02001880static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
1881{
1882 int i = ARRAY_SIZE(sb->extended_failed_devices);
1883
1884 sb->failed_devices = cpu_to_le64(failed_devices[0]);
1885 while (i--)
1886 sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]);
1887}
1888
1889/*
1890 * Synchronize the superblock members with the raid set properties
1891 *
1892 * All superblock data is little endian.
1893 */
NeilBrownfd01b882011-10-11 16:47:53 +11001894static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001895{
Heinz Mauelshagen7b34df72016-05-19 18:49:32 +02001896 bool update_failed_devices = false;
1897 unsigned int i;
1898 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001899 struct dm_raid_superblock *sb;
Jonathan Brassow81f382f2012-05-22 13:55:30 +10001900 struct raid_set *rs = container_of(mddev, struct raid_set, md);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001901
Heinz Mauelshagen7b34df72016-05-19 18:49:32 +02001902 /* No metadata device, no superblock */
1903 if (!rdev->meta_bdev)
1904 return;
1905
1906 BUG_ON(!rdev->sb_page);
1907
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001908 sb = page_address(rdev->sb_page);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001909
Heinz Mauelshagen7b34df72016-05-19 18:49:32 +02001910 sb_retrieve_failed_devices(sb, failed_devices);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001911
Heinz Mauelshagen7b34df72016-05-19 18:49:32 +02001912 for (i = 0; i < rs->raid_disks; i++)
1913 if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) {
1914 update_failed_devices = true;
1915 set_bit(i, (void *) failed_devices);
1916 }
1917
1918 if (update_failed_devices)
1919 sb_update_failed_devices(sb, failed_devices);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001920
1921 sb->magic = cpu_to_le32(DM_RAID_MAGIC);
Mike Snitzer9b6e5422016-06-02 11:48:09 -04001922 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001923
1924 sb->num_devices = cpu_to_le32(mddev->raid_disks);
1925 sb->array_position = cpu_to_le32(rdev->raid_disk);
1926
1927 sb->events = cpu_to_le64(mddev->events);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001928
1929 sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
1930 sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
1931
1932 sb->level = cpu_to_le32(mddev->level);
1933 sb->layout = cpu_to_le32(mddev->layout);
1934 sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
Heinz Mauelshagen7b34df72016-05-19 18:49:32 +02001935
1936 sb->new_level = cpu_to_le32(mddev->new_level);
1937 sb->new_layout = cpu_to_le32(mddev->new_layout);
1938 sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors);
1939
1940 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1941
1942 smp_rmb(); /* Make sure we access most recent reshape position */
1943 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1944 if (le64_to_cpu(sb->reshape_position) != MaxSector) {
1945 /* Flag ongoing reshape */
1946 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE);
1947
1948 if (mddev->delta_disks < 0 || mddev->reshape_backwards)
1949 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS);
Mike Snitzer42863252016-06-02 12:27:46 -04001950 } else {
1951 /* Clear reshape flags */
1952 sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS));
1953 }
Heinz Mauelshagen7b34df72016-05-19 18:49:32 +02001954
1955 sb->array_sectors = cpu_to_le64(mddev->array_sectors);
1956 sb->data_offset = cpu_to_le64(rdev->data_offset);
1957 sb->new_data_offset = cpu_to_le64(rdev->new_data_offset);
1958 sb->sectors = cpu_to_le64(rdev->sectors);
1959
1960 /* Zero out the rest of the payload after the size of the superblock */
1961 memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001962}
1963
1964/*
1965 * super_load
1966 *
1967 * This function creates a superblock if one is not found on the device
1968 * and will decide which superblock to use if there's a choice.
1969 *
1970 * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
1971 */
NeilBrown3cb03002011-10-11 16:45:26 +11001972static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001973{
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02001974 int r;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001975 struct dm_raid_superblock *sb;
1976 struct dm_raid_superblock *refsb;
1977 uint64_t events_sb, events_refsb;
1978
1979 rdev->sb_start = 0;
Heinz Mauelshagen40d43c42014-10-17 13:38:50 +02001980 rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
1981 if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) {
1982 DMERR("superblock size of a logical block is no longer valid");
1983 return -EINVAL;
1984 }
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001985
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02001986 r = read_disk_sb(rdev, rdev->sb_size);
1987 if (r)
1988 return r;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001989
1990 sb = page_address(rdev->sb_page);
Jonathan E Brassow3aa3b2b2012-03-07 19:09:47 +00001991
1992 /*
1993 * Two cases that we want to write new superblocks and rebuild:
1994 * 1) New device (no matching magic number)
1995 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
1996 */
1997 if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
1998 (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
Jonathan Brassowb12d4372011-08-02 12:32:07 +01001999 super_sync(rdev->mddev, rdev);
2000
2001 set_bit(FirstUse, &rdev->flags);
Mike Snitzer9b6e5422016-06-02 11:48:09 -04002002 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002003
2004 /* Force writing of superblocks to disk */
2005 set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags);
2006
2007 /* Any superblock is better than none, choose that if given */
2008 return refdev ? 0 : 1;
2009 }
2010
2011 if (!refdev)
2012 return 1;
2013
2014 events_sb = le64_to_cpu(sb->events);
2015
2016 refsb = page_address(refdev->sb_page);
2017 events_refsb = le64_to_cpu(refsb->events);
2018
2019 return (events_sb > events_refsb) ? 1 : 0;
2020}
2021
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002022static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002023{
2024 int role;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002025 unsigned int d;
2026 struct mddev *mddev = &rs->md;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002027 uint64_t events_sb;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002028 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002029 struct dm_raid_superblock *sb;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002030 uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0;
NeilBrowndafb20f2012-03-19 12:46:39 +11002031 struct md_rdev *r;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002032 struct dm_raid_superblock *sb2;
2033
2034 sb = page_address(rdev->sb_page);
2035 events_sb = le64_to_cpu(sb->events);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002036
2037 /*
2038 * Initialise to 1 if this is a new superblock.
2039 */
2040 mddev->events = events_sb ? : 1;
2041
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002042 mddev->reshape_position = MaxSector;
2043
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002044 /*
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002045 * Reshaping is supported, e.g. reshape_position is valid
2046 * in superblock and superblock content is authoritative.
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002047 */
Mike Snitzer42863252016-06-02 12:27:46 -04002048 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002049 /* Superblock is authoritative wrt given raid set layout! */
2050 mddev->raid_disks = le32_to_cpu(sb->num_devices);
2051 mddev->level = le32_to_cpu(sb->level);
2052 mddev->layout = le32_to_cpu(sb->layout);
2053 mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors);
2054 mddev->new_level = le32_to_cpu(sb->new_level);
2055 mddev->new_layout = le32_to_cpu(sb->new_layout);
2056 mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors);
2057 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
2058 mddev->array_sectors = le64_to_cpu(sb->array_sectors);
2059
2060 /* raid was reshaping and got interrupted */
Mike Snitzer42863252016-06-02 12:27:46 -04002061 if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) {
2062 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002063 DMERR("Reshape requested but raid set is still reshaping");
2064 return -EINVAL;
2065 }
2066
2067 if (mddev->delta_disks < 0 ||
Mike Snitzer42863252016-06-02 12:27:46 -04002068 (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS)))
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002069 mddev->reshape_backwards = 1;
2070 else
2071 mddev->reshape_backwards = 0;
2072
2073 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
2074 rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout);
2075 }
2076
2077 } else {
2078 /*
Mike Snitzer9b6e5422016-06-02 11:48:09 -04002079 * No takeover/reshaping, because we don't have the extended v1.9.0 metadata
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002080 */
2081 if (le32_to_cpu(sb->level) != mddev->level) {
2082 DMERR("Reshaping/takeover raid sets not yet supported. (raid level/stripes/size change)");
2083 return -EINVAL;
2084 }
2085 if (le32_to_cpu(sb->layout) != mddev->layout) {
2086 DMERR("Reshaping raid sets not yet supported. (raid layout change)");
Mike Snitzer43157842016-05-30 13:03:37 -04002087 DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout);
2088 DMERR(" Old layout: %s w/ %d copies",
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002089 raid10_md_layout_to_format(le32_to_cpu(sb->layout)),
2090 raid10_md_layout_to_copies(le32_to_cpu(sb->layout)));
Mike Snitzer43157842016-05-30 13:03:37 -04002091 DMERR(" New layout: %s w/ %d copies",
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002092 raid10_md_layout_to_format(mddev->layout),
2093 raid10_md_layout_to_copies(mddev->layout));
2094 return -EINVAL;
2095 }
2096 if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) {
2097 DMERR("Reshaping raid sets not yet supported. (stripe sectors change)");
2098 return -EINVAL;
2099 }
2100
2101 /* We can only change the number of devices in raid1 with old (i.e. pre 1.0.7) metadata */
2102 if (!rt_is_raid1(rs->raid_type) &&
2103 (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) {
2104 DMERR("Reshaping raid sets not yet supported. (device count change from %u to %u)",
2105 sb->num_devices, mddev->raid_disks);
2106 return -EINVAL;
2107 }
2108
2109 /* Table line is checked vs. authoritative superblock */
2110 rs_set_new(rs);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002111 }
2112
Mike Snitzer42863252016-06-02 12:27:46 -04002113 if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002114 mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
2115
2116 /*
2117 * During load, we set FirstUse if a new superblock was written.
2118 * There are two reasons we might not have a superblock:
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002119 * 1) The raid set is brand new - in which case, all of the
Mike Snitzer43157842016-05-30 13:03:37 -04002120 * devices must have their In_sync bit set. Also,
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002121 * recovery_cp must be 0, unless forced.
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002122 * 2) This is a new device being added to an old raid set
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002123 * and the new device needs to be rebuilt - in which
2124 * case the In_sync bit will /not/ be set and
2125 * recovery_cp must be MaxSector.
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002126 * 3) This is/are a new device(s) being added to an old
2127 * raid set during takeover to a higher raid level
2128 * to provide capacity for redundancy or during reshape
2129 * to add capacity to grow the raid set.
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002130 */
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002131 d = 0;
NeilBrowndafb20f2012-03-19 12:46:39 +11002132 rdev_for_each(r, mddev) {
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002133 if (test_bit(FirstUse, &r->flags))
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002134 new_devs++;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002135
2136 if (!test_bit(In_sync, &r->flags)) {
2137 DMINFO("Device %d specified for rebuild; clearing superblock",
2138 r->raid_disk);
2139 rebuilds++;
2140
2141 if (test_bit(FirstUse, &r->flags))
2142 rebuild_and_new++;
2143 }
2144
2145 d++;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002146 }
2147
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002148 if (new_devs == rs->raid_disks || !rebuilds) {
2149 /* Replace a broken device */
2150 if (new_devs == 1 && !rs->delta_disks)
2151 ;
2152 if (new_devs == rs->raid_disks) {
2153 DMINFO("Superblocks created for new raid set");
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002154 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002155 } else if (new_devs != rebuilds &&
2156 new_devs != rs->delta_disks) {
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002157 DMERR("New device injected into existing raid set without "
2158 "'delta_disks' or 'rebuild' parameter specified");
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002159 return -EINVAL;
2160 }
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002161 } else if (new_devs && new_devs != rebuilds) {
2162 DMERR("%u 'rebuild' devices cannot be injected into"
2163 " a raid set with %u other first-time devices",
2164 rebuilds, new_devs);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002165 return -EINVAL;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002166 } else if (rebuilds) {
2167 if (rebuild_and_new && rebuilds != rebuild_and_new) {
2168 DMERR("new device%s provided without 'rebuild'",
2169 new_devs > 1 ? "s" : "");
2170 return -EINVAL;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002171 } else if (rs_is_recovering(rs)) {
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002172 DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)",
2173 (unsigned long long) mddev->recovery_cp);
2174 return -EINVAL;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002175 } else if (rs_is_reshaping(rs)) {
2176 DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)",
2177 (unsigned long long) mddev->reshape_position);
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002178 return -EINVAL;
2179 }
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002180 }
2181
2182 /*
2183 * Now we set the Faulty bit for those devices that are
2184 * recorded in the superblock as failed.
2185 */
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002186 sb_retrieve_failed_devices(sb, failed_devices);
NeilBrowndafb20f2012-03-19 12:46:39 +11002187 rdev_for_each(r, mddev) {
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002188 if (!r->sb_page)
2189 continue;
2190 sb2 = page_address(r->sb_page);
2191 sb2->failed_devices = 0;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002192 memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices));
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002193
2194 /*
2195 * Check for any device re-ordering.
2196 */
2197 if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
2198 role = le32_to_cpu(sb2->array_position);
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002199 if (role < 0)
2200 continue;
2201
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002202 if (role != r->raid_disk) {
Mike Snitzere6ca5e12016-06-02 15:27:22 -04002203 if (__is_raid10_near(mddev->layout)) {
2204 if (mddev->raid_disks % __raid10_near_copies(mddev->layout) ||
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04002205 rs->raid_disks % rs->raid10_copies) {
2206 rs->ti->error =
2207 "Cannot change raid10 near set to odd # of devices!";
2208 return -EINVAL;
2209 }
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002210
2211 sb2->array_position = cpu_to_le32(r->raid_disk);
2212
2213 } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) &&
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04002214 !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) &&
2215 !rt_is_raid1(rs->raid_type)) {
2216 rs->ti->error = "Cannot change device positions in raid set";
2217 return -EINVAL;
2218 }
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002219
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04002220 DMINFO("raid device #%d now at position #%d", role, r->raid_disk);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002221 }
2222
2223 /*
2224 * Partial recovery is performed on
2225 * returning failed devices.
2226 */
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002227 if (test_bit(role, (void *) failed_devices))
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002228 set_bit(Faulty, &r->flags);
2229 }
2230 }
2231
2232 return 0;
2233}
2234
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02002235static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002236{
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02002237 struct mddev *mddev = &rs->md;
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002238 struct dm_raid_superblock *sb;
2239
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02002240 if (rs_is_raid0(rs) || !rdev->sb_page)
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002241 return 0;
2242
2243 sb = page_address(rdev->sb_page);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002244
2245 /*
2246 * If mddev->events is not set, we know we have not yet initialized
2247 * the array.
2248 */
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002249 if (!mddev->events && super_init_validation(rs, rdev))
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002250 return -EINVAL;
2251
Mike Snitzer9b6e5422016-06-02 11:48:09 -04002252 if (le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
2253 rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
2254 return -EINVAL;
2255 }
2256
2257 if (sb->incompat_features) {
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002258 rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet";
Heinz Mauelshagen4c9971c2016-04-29 18:59:56 +02002259 return -EINVAL;
2260 }
2261
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02002262 /* Enable bitmap creation for RAID levels != 0 */
Heinz Mauelshagen676fa5a2016-05-19 18:49:29 +02002263 mddev->bitmap_info.offset = rt_is_raid0(rs->raid_type) ? 0 : to_sector(4096);
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02002264 rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
2265
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002266 if (!test_and_clear_bit(FirstUse, &rdev->flags)) {
2267 /* Retrieve device size stored in superblock to be prepared for shrink */
2268 rdev->sectors = le64_to_cpu(sb->sectors);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002269 rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002270 if (rdev->recovery_offset == MaxSector)
2271 set_bit(In_sync, &rdev->flags);
2272 /*
2273 * If no reshape in progress -> we're recovering single
2274 * disk(s) and have to set the device(s) to out-of-sync
2275 */
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002276 else if (!rs_is_reshaping(rs))
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002277 clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002278 }
2279
2280 /*
2281 * If a device comes back, set it as not In_sync and no longer faulty.
2282 */
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002283 if (test_and_clear_bit(Faulty, &rdev->flags)) {
2284 rdev->recovery_offset = 0;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002285 clear_bit(In_sync, &rdev->flags);
2286 rdev->saved_raid_disk = rdev->raid_disk;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002287 }
2288
Heinz Mauelshagen33e53f02016-05-19 18:49:30 +02002289 /* Reshape support -> restore repective data offsets */
2290 rdev->data_offset = le64_to_cpu(sb->data_offset);
2291 rdev->new_data_offset = le64_to_cpu(sb->new_data_offset);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002292
2293 return 0;
2294}
2295
2296/*
2297 * Analyse superblocks and select the freshest.
2298 */
2299static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
2300{
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002301 int r;
Jonathan E Brassow04475682012-03-28 18:41:26 +01002302 struct raid_dev *dev;
Jonathan Brassowa9ad8522012-04-24 10:23:13 +10002303 struct md_rdev *rdev, *tmp, *freshest;
NeilBrownfd01b882011-10-11 16:47:53 +11002304 struct mddev *mddev = &rs->md;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002305
2306 freshest = NULL;
Jonathan Brassowa9ad8522012-04-24 10:23:13 +10002307 rdev_for_each_safe(rdev, tmp, mddev) {
Jonathan Brassow761becf2012-10-11 13:42:19 +11002308 /*
Heinz Mauelshagenc76d53f2015-04-29 14:03:00 +02002309 * Skipping super_load due to CTR_FLAG_SYNC will cause
Jonathan Brassow761becf2012-10-11 13:42:19 +11002310 * the array to undergo initialization again as
Mike Snitzer43157842016-05-30 13:03:37 -04002311 * though it were new. This is the intended effect
Jonathan Brassow761becf2012-10-11 13:42:19 +11002312 * of the "sync" directive.
2313 *
2314 * When reshaping capability is added, we must ensure
2315 * that the "sync" directive is disallowed during the
2316 * reshape.
2317 */
Mike Snitzer42863252016-06-02 12:27:46 -04002318 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
Jonathan Brassow761becf2012-10-11 13:42:19 +11002319 continue;
2320
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002321 if (!rdev->meta_bdev)
2322 continue;
2323
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002324 r = super_load(rdev, freshest);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002325
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002326 switch (r) {
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002327 case 1:
2328 freshest = rdev;
2329 break;
2330 case 0:
2331 break;
2332 default:
Jonathan E Brassow04475682012-03-28 18:41:26 +01002333 dev = container_of(rdev, struct raid_dev, rdev);
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06002334 if (dev->meta_dev)
2335 dm_put_device(ti, dev->meta_dev);
Jonathan E Brassow04475682012-03-28 18:41:26 +01002336
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06002337 dev->meta_dev = NULL;
2338 rdev->meta_bdev = NULL;
Jonathan E Brassow04475682012-03-28 18:41:26 +01002339
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06002340 if (rdev->sb_page)
2341 put_page(rdev->sb_page);
Jonathan E Brassow04475682012-03-28 18:41:26 +01002342
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06002343 rdev->sb_page = NULL;
Jonathan E Brassow04475682012-03-28 18:41:26 +01002344
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06002345 rdev->sb_loaded = 0;
Jonathan E Brassow04475682012-03-28 18:41:26 +01002346
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06002347 /*
2348 * We might be able to salvage the data device
2349 * even though the meta device has failed. For
2350 * now, we behave as though '- -' had been
2351 * set for this device in the table.
2352 */
2353 if (dev->data_dev)
2354 dm_put_device(ti, dev->data_dev);
Jonathan E Brassow04475682012-03-28 18:41:26 +01002355
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06002356 dev->data_dev = NULL;
2357 rdev->bdev = NULL;
Jonathan E Brassow04475682012-03-28 18:41:26 +01002358
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06002359 list_del(&rdev->same_set);
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002360 }
2361 }
2362
2363 if (!freshest)
2364 return 0;
2365
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04002366 if (validate_raid_redundancy(rs)) {
2367 rs->ti->error = "Insufficient redundancy to activate array";
2368 return -EINVAL;
2369 }
Jonathan Brassow55ebbb52013-01-22 21:42:18 -06002370
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002371 /*
2372 * Validation of the freshest device provides the source of
2373 * validation for the remaining devices.
2374 */
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002375 rs->ti->error = "Unable to assemble array: Invalid superblocks";
2376 if (super_validate(rs, freshest))
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04002377 return -EINVAL;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002378
NeilBrowndafb20f2012-03-19 12:46:39 +11002379 rdev_for_each(rdev, mddev)
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02002380 if ((rdev != freshest) && super_validate(rs, rdev))
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002381 return -EINVAL;
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002382 return 0;
2383}
2384
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02002385/*
2386 * Adjust data_offset and new_data_offset on all disk members of @rs
2387 * for out of place reshaping if requested by contructor
2388 *
2389 * We need free space at the beginning of each raid disk for forward
2390 * and at the end for backward reshapes which userspace has to provide
2391 * via remapping/reordering of space.
2392 */
2393static int rs_adjust_data_offsets(struct raid_set *rs)
2394{
2395 sector_t data_offset = 0, new_data_offset = 0;
2396 struct md_rdev *rdev;
2397
2398 /* Constructor did not request data offset change */
2399 if (!test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
2400 if (!rs_is_reshapable(rs))
2401 goto out;
2402
2403 return 0;
2404 }
2405
2406 /* HM FIXME: get InSync raid_dev? */
2407 rdev = &rs->dev[0].rdev;
2408
2409 if (rs->delta_disks < 0) {
2410 /*
2411 * Removing disks (reshaping backwards):
2412 *
2413 * - before reshape: data is at offset 0 and free space
2414 * is at end of each component LV
2415 *
2416 * - after reshape: data is at offset rs->data_offset != 0 on each component LV
2417 */
2418 data_offset = 0;
2419 new_data_offset = rs->data_offset;
2420
2421 } else if (rs->delta_disks > 0) {
2422 /*
2423 * Adding disks (reshaping forwards):
2424 *
2425 * - before reshape: data is at offset rs->data_offset != 0 and
2426 * free space is at begin of each component LV
2427 *
2428 * - after reshape: data is at offset 0 on each component LV
2429 */
2430 data_offset = rs->data_offset;
2431 new_data_offset = 0;
2432
2433 } else {
2434 /*
2435 * User space passes in 0 for data offset after having removed reshape space
2436 *
2437 * - or - (data offset != 0)
2438 *
2439 * Changing RAID layout or chunk size -> toggle offsets
2440 *
2441 * - before reshape: data is at offset rs->data_offset 0 and
2442 * free space is at end of each component LV
2443 * -or-
2444 * data is at offset rs->data_offset != 0 and
2445 * free space is at begin of each component LV
2446 *
Heinz Mauelshagen2527b562016-06-24 01:03:19 +02002447 * - after reshape: data is at offset 0 if it was at offset != 0
2448 * or at offset != 0 if it was at offset 0
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02002449 * on each component LV
2450 *
2451 */
2452 data_offset = rs->data_offset ? rdev->data_offset : 0;
2453 new_data_offset = data_offset ? 0 : rs->data_offset;
2454 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2455 }
2456
2457 /*
2458 * Make sure we got a minimum amount of free sectors per device
2459 */
2460 if (rs->data_offset &&
2461 to_sector(i_size_read(rdev->bdev->bd_inode)) - rdev->sectors < MIN_FREE_RESHAPE_SPACE) {
2462 rs->ti->error = data_offset ? "No space for forward reshape" :
2463 "No space for backward reshape";
2464 return -ENOSPC;
2465 }
2466out:
2467 /* Adjust data offsets on all rdevs */
2468 rdev_for_each(rdev, &rs->md) {
2469 rdev->data_offset = data_offset;
2470 rdev->new_data_offset = new_data_offset;
2471 }
2472
2473 return 0;
2474}
2475
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002476/* Userpace reordered disks -> adjust raid_disk indexes in @rs */
Mike Snitzere6ca5e12016-06-02 15:27:22 -04002477static void __reorder_raid_disk_indexes(struct raid_set *rs)
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002478{
2479 int i = 0;
2480 struct md_rdev *rdev;
2481
2482 rdev_for_each(rdev, &rs->md) {
2483 rdev->raid_disk = i++;
2484 rdev->saved_raid_disk = rdev->new_raid_disk = -1;
2485 }
2486}
2487
2488/*
2489 * Setup @rs for takeover by a different raid level
2490 */
2491static int rs_setup_takeover(struct raid_set *rs)
2492{
2493 struct mddev *mddev = &rs->md;
2494 struct md_rdev *rdev;
2495 unsigned int d = mddev->raid_disks = rs->raid_disks;
2496 sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset;
2497
2498 if (rt_is_raid10(rs->raid_type)) {
2499 if (mddev->level == 0) {
2500 /* Userpace reordered disks -> adjust raid_disk indexes */
Mike Snitzere6ca5e12016-06-02 15:27:22 -04002501 __reorder_raid_disk_indexes(rs);
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002502
2503 /* raid0 -> raid10_far layout */
2504 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,
2505 rs->raid10_copies);
2506 } else if (mddev->level == 1)
2507 /* raid1 -> raid10_near layout */
2508 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2509 rs->raid_disks);
2510 else
2511 return -EINVAL;
2512
2513 }
2514
2515 clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2516 mddev->recovery_cp = MaxSector;
2517
2518 while (d--) {
2519 rdev = &rs->dev[d].rdev;
2520
2521 if (test_bit(d, (void *) rs->rebuild_disks)) {
2522 clear_bit(In_sync, &rdev->flags);
2523 clear_bit(Faulty, &rdev->flags);
2524 mddev->recovery_cp = rdev->recovery_offset = 0;
2525 /* Bitmap has to be created when we do an "up" takeover */
2526 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2527 }
2528
2529 rdev->new_data_offset = new_data_offset;
2530 }
2531
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002532 return 0;
2533}
2534
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02002535/* Prepare @rs for reshape */
2536static int rs_prepare_reshape(struct raid_set *rs)
2537{
2538 bool reshape;
2539 struct mddev *mddev = &rs->md;
2540
2541 if (rs_is_raid10(rs)) {
2542 if (rs->raid_disks != mddev->raid_disks &&
2543 __is_raid10_near(mddev->layout) &&
2544 rs->raid10_copies &&
2545 rs->raid10_copies != __raid10_near_copies(mddev->layout)) {
2546 /*
2547 * raid disk have to be multiple of data copies to allow this conversion,
2548 *
2549 * This is actually not a reshape it is a
2550 * rebuild of any additional mirrors per group
2551 */
2552 if (rs->raid_disks % rs->raid10_copies) {
2553 rs->ti->error = "Can't reshape raid10 mirror groups";
2554 return -EINVAL;
2555 }
2556
2557 /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */
2558 __reorder_raid_disk_indexes(rs);
2559 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2560 rs->raid10_copies);
2561 mddev->new_layout = mddev->layout;
2562 reshape = false;
2563 } else
2564 reshape = true;
2565
2566 } else if (rs_is_raid456(rs))
2567 reshape = true;
2568
2569 /*
2570 * HM FIXME: process raid1 via delta_disks as well?
2571 * Would cause allocations in raid1->check_reshape
2572 * though, thus more issues with potential failures
2573 */
2574 else if (rs_is_raid1(rs)) {
2575 set_bit(RT_FLAG_KEEP_RS_FROZEN, &rs->runtime_flags);
2576 mddev->raid_disks = rs->raid_disks;
2577 reshape = false;
2578
2579 } else {
2580 rs->ti->error = "Called with bogus raid type";
2581 return -EINVAL;
2582 }
2583
2584 if (reshape) {
2585 set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags);
2586 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2587 set_bit(RT_FLAG_KEEP_RS_FROZEN, &rs->runtime_flags);
2588 }
2589 /* Create new superblocks and bitmaps, if any */
2590 if (mddev->raid_disks < rs->raid_disks) {
2591 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2592 rs_set_cur(rs);
2593 }
2594
2595 return 0;
2596}
2597
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002598/*
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002599 *
2600 * - change raid layout
2601 * - change chunk size
2602 * - add disks
2603 * - remove disks
2604 */
2605static int rs_setup_reshape(struct raid_set *rs)
2606{
2607 int r = 0;
2608 unsigned int cur_raid_devs, d;
2609 struct mddev *mddev = &rs->md;
2610 struct md_rdev *rdev;
2611
2612 mddev->delta_disks = rs->delta_disks;
2613 cur_raid_devs = mddev->raid_disks;
2614
2615 /* Ignore impossible layout change whilst adding/removing disks */
2616 if (mddev->delta_disks &&
2617 mddev->layout != mddev->new_layout) {
2618 DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks);
2619 mddev->new_layout = mddev->layout;
2620 }
2621
2622 /*
2623 * Adjust array size:
2624 *
2625 * - in case of adding disks, array size has
2626 * to grow after the disk adding reshape,
2627 * which'll hapen in the event handler;
2628 * reshape will happen forward, so space has to
2629 * be available at the beginning of each disk
2630 *
2631 * - in case of removing disks, array size
2632 * has to shrink before starting the reshape,
2633 * which'll happen here;
2634 * reshape will happen backward, so space has to
2635 * be available at the end of each disk
2636 *
2637 * - data_offset and new_data_offset are
Heinz Mauelshagenae3c6cf2016-06-15 22:27:40 +02002638 * adjusted for aforementioned out of place
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002639 * reshaping based on userspace passing in
2640 * the "data_offset <sectors>" key/value
Heinz Mauelshagenae3c6cf2016-06-15 22:27:40 +02002641 * pair via the constructor
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002642 */
2643
2644 /* Add disk(s) */
2645 if (rs->delta_disks > 0) {
2646 /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */
2647 for (d = cur_raid_devs; d < rs->raid_disks; d++) {
2648 rdev = &rs->dev[d].rdev;
2649 clear_bit(In_sync, &rdev->flags);
2650
2651 /*
2652 * save_raid_disk needs to be -1, or recovery_offset will be set to 0
2653 * by md, which'll store that erroneously in the superblock on reshape
2654 */
2655 rdev->saved_raid_disk = -1;
2656 rdev->raid_disk = d;
2657
2658 rdev->sectors = mddev->dev_sectors;
2659 rdev->recovery_offset = MaxSector;
2660 }
2661
2662 mddev->reshape_backwards = 0; /* adding disks -> forward reshape */
2663
2664 /* Remove disk(s) */
2665 } else if (rs->delta_disks < 0) {
2666 r = rs_set_dev_and_array_sectors(rs, true);
2667 mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */
2668
2669 /* Change layout and/or chunk size */
2670 } else {
2671 /*
2672 * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size:
2673 *
2674 * keeping number of disks and do layout change ->
2675 *
2676 * toggle reshape_backward depending on data_offset:
2677 *
2678 * - free space upfront -> reshape forward
2679 *
2680 * - free space at the end -> reshape backward
2681 *
2682 *
2683 * This utilizes free reshape space avoiding the need
2684 * for userspace to move (parts of) LV segments in
2685 * case of layout/chunksize change (for disk
2686 * adding/removing reshape space has to be at
2687 * the proper address (see above with delta_disks):
2688 *
2689 * add disk(s) -> begin
2690 * remove disk(s)-> end
2691 */
2692 mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1;
2693 }
2694
2695 return r;
2696}
2697
2698/*
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02002699 * Enable/disable discard support on RAID set depending on
2700 * RAID level and discard properties of underlying RAID members.
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02002701 */
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002702static void configure_discard_support(struct raid_set *rs)
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02002703{
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02002704 int i;
2705 bool raid456;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002706 struct dm_target *ti = rs->ti;
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02002707
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02002708 /* Assume discards not supported until after checks below. */
2709 ti->discards_supported = false;
2710
2711 /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02002712 raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6);
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02002713
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02002714 for (i = 0; i < rs->md.raid_disks; i++) {
Heinz Mauelshagend20c4b02014-10-29 19:02:27 +01002715 struct request_queue *q;
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02002716
Heinz Mauelshagend20c4b02014-10-29 19:02:27 +01002717 if (!rs->dev[i].rdev.bdev)
2718 continue;
2719
2720 q = bdev_get_queue(rs->dev[i].rdev.bdev);
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02002721 if (!q || !blk_queue_discard(q))
2722 return;
2723
2724 if (raid456) {
2725 if (!q->limits.discard_zeroes_data)
2726 return;
2727 if (!devices_handle_discard_safely) {
2728 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
2729 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
2730 return;
2731 }
2732 }
2733 }
2734
2735 /* All RAID members properly support discards */
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02002736 ti->discards_supported = true;
2737
2738 /*
2739 * RAID1 and RAID10 personalities require bio splitting,
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02002740 * RAID0/4/5/6 don't and process large discard bios properly.
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02002741 */
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02002742 ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10);
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02002743 ti->num_discard_bios = 1;
2744}
2745
2746/*
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002747 * Construct a RAID0/1/10/4/5/6 mapping:
NeilBrown9d09e662011-01-13 20:00:02 +00002748 * Args:
Mike Snitzer43157842016-05-30 13:03:37 -04002749 * <raid_type> <#raid_params> <raid_params>{0,} \
2750 * <#raid_devs> [<meta_dev1> <dev1>]{1,}
NeilBrown9d09e662011-01-13 20:00:02 +00002751 *
Mike Snitzer43157842016-05-30 13:03:37 -04002752 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
NeilBrown9d09e662011-01-13 20:00:02 +00002753 * details on possible <raid_params>.
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002754 *
2755 * Userspace is free to initialize the metadata devices, hence the superblocks to
2756 * enforce recreation based on the passed in table parameters.
2757 *
NeilBrown9d09e662011-01-13 20:00:02 +00002758 */
2759static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
2760{
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002761 int r;
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02002762 bool resize;
NeilBrown9d09e662011-01-13 20:00:02 +00002763 struct raid_type *rt;
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02002764 unsigned num_raid_params, num_raid_devs;
Heinz Mauelshagen4dff2f12016-06-24 00:21:09 +02002765 sector_t calculated_dev_sectors;
NeilBrown9d09e662011-01-13 20:00:02 +00002766 struct raid_set *rs = NULL;
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02002767 const char *arg;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002768 struct rs_layout rs_layout;
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02002769 struct dm_arg_set as = { argc, argv }, as_nrd;
2770 struct dm_arg _args[] = {
2771 { 0, as.argc, "Cannot understand number of raid parameters" },
2772 { 1, 254, "Cannot understand number of raid devices parameters" }
2773 };
NeilBrown9d09e662011-01-13 20:00:02 +00002774
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02002775 /* Must have <raid_type> */
2776 arg = dm_shift_arg(&as);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04002777 if (!arg) {
2778 ti->error = "No arguments";
2779 return -EINVAL;
2780 }
NeilBrown9d09e662011-01-13 20:00:02 +00002781
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02002782 rt = get_raid_type(arg);
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04002783 if (!rt) {
2784 ti->error = "Unrecognised raid_type";
2785 return -EINVAL;
2786 }
NeilBrown9d09e662011-01-13 20:00:02 +00002787
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02002788 /* Must have <#raid_params> */
2789 if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error))
Mike Snitzer43157842016-05-30 13:03:37 -04002790 return -EINVAL;
NeilBrown9d09e662011-01-13 20:00:02 +00002791
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02002792 /* number of raid device tupples <meta_dev data_dev> */
2793 as_nrd = as;
2794 dm_consume_args(&as_nrd, num_raid_params);
2795 _args[1].max = (as_nrd.argc - 1) / 2;
2796 if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error))
Mike Snitzer43157842016-05-30 13:03:37 -04002797 return -EINVAL;
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02002798
Mike Snitzerbb91a632016-06-02 12:06:54 -04002799 if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) {
Mike Snitzerbd83a4c2016-05-31 14:26:52 -04002800 ti->error = "Invalid number of supplied raid devices";
2801 return -EINVAL;
2802 }
NeilBrown9d09e662011-01-13 20:00:02 +00002803
Mike Snitzerbfcee0e2016-06-02 15:08:09 -04002804 rs = raid_set_alloc(ti, rt, num_raid_devs);
NeilBrown9d09e662011-01-13 20:00:02 +00002805 if (IS_ERR(rs))
2806 return PTR_ERR(rs);
2807
Heinz Mauelshagen92c83d72016-05-19 18:49:25 +02002808 r = parse_raid_params(rs, &as, num_raid_params);
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002809 if (r)
NeilBrown9d09e662011-01-13 20:00:02 +00002810 goto bad;
2811
Heinz Mauelshagen702108d2016-05-19 18:49:26 +02002812 r = parse_dev_params(rs, &as);
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002813 if (r)
NeilBrown9d09e662011-01-13 20:00:02 +00002814 goto bad;
2815
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002816 rs->md.sync_super = super_sync;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002817
Heinz Mauelshagen2527b562016-06-24 01:03:19 +02002818 /*
2819 * Calculate ctr requested array and device sizes to allow
2820 * for superblock analysis needing device sizes defined.
2821 *
2822 * Any existing superblock will overwrite the array and device sizes
2823 */
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02002824 r = rs_set_dev_and_array_sectors(rs, false);
2825 if (r)
Heinz Mauelshagenb1956dc2016-06-24 21:49:26 +02002826 goto bad;
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02002827
Heinz Mauelshagen4dff2f12016-06-24 00:21:09 +02002828 calculated_dev_sectors = rs->dev[0].rdev.sectors;
2829
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002830 /*
2831 * Backup any new raid set level, layout, ...
2832 * requested to be able to compare to superblock
2833 * members for conversion decisions.
2834 */
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002835 rs_config_backup(rs, &rs_layout);
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002836
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002837 r = analyse_superblocks(ti, rs);
2838 if (r)
Jonathan Brassowb12d4372011-08-02 12:32:07 +01002839 goto bad;
2840
Heinz Mauelshagen2a5556c2016-06-27 14:44:09 +02002841 resize = calculated_dev_sectors != rs->dev[0].rdev.sectors;
Heinz Mauelshagen4dff2f12016-06-24 00:21:09 +02002842
NeilBrown9d09e662011-01-13 20:00:02 +00002843 INIT_WORK(&rs->md.event_work, do_table_event);
NeilBrown9d09e662011-01-13 20:00:02 +00002844 ti->private = rs;
Alasdair G Kergon55a62ee2013-03-01 22:45:47 +00002845 ti->num_flush_bios = 1;
NeilBrown9d09e662011-01-13 20:00:02 +00002846
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002847 /* Restore any requested new layout for conversion decision */
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002848 rs_config_restore(rs, &rs_layout);
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002849
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02002850 /*
2851 * Now that we have any superblock metadata available,
2852 * check for new, recovering, reshaping, to be taken over,
2853 * to be reshaped or an existing, unchanged raid set to
2854 * run in sequence.
2855 */
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002856 if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) {
Heinz Mauelshagen2d92a3c2016-06-24 00:32:58 +02002857 /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */
2858 if (rs_is_raid6(rs) &&
2859 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
2860 ti->error = "'nosync' not allowed for new raid6 set";
Heinz Mauelshagenb1956dc2016-06-24 21:49:26 +02002861 r = -EINVAL;
2862 goto bad;
Heinz Mauelshagen2d92a3c2016-06-24 00:32:58 +02002863 }
2864 rs_setup_recovery(rs, 0);
Heinz Mauelshagen2a5556c2016-06-27 14:44:09 +02002865 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2866 rs_set_new(rs);
2867 } else if (rs_is_recovering(rs)) {
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02002868 /* A recovering raid set may be resized */
Heinz Mauelshagen2a5556c2016-06-27 14:44:09 +02002869 ; /* skip setup rs */
2870 } else if (rs_is_reshaping(rs)) {
2871 /* Have to reject size change request during reshape */
2872 if (resize) {
2873 ti->error = "Can't resize a reshaping raid set";
Heinz Mauelshagenb1956dc2016-06-24 21:49:26 +02002874 r = -EPERM;
2875 goto bad;
Heinz Mauelshagen2d92a3c2016-06-24 00:32:58 +02002876 }
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02002877 /* skip setup rs */
Heinz Mauelshagen2d92a3c2016-06-24 00:32:58 +02002878 } else if (rs_takeover_requested(rs)) {
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002879 if (rs_is_reshaping(rs)) {
2880 ti->error = "Can't takeover a reshaping raid set";
Heinz Mauelshagenb1956dc2016-06-24 21:49:26 +02002881 r = -EPERM;
2882 goto bad;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002883 }
2884
2885 /*
Heinz Mauelshagen2527b562016-06-24 01:03:19 +02002886 * If a takeover is needed, userspace sets any additional
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02002887 * devices to rebuild and we can check for a valid request here.
2888 *
2889 * If acceptible, set the level to the new requested
Heinz Mauelshagen2a5556c2016-06-27 14:44:09 +02002890 * one, prohibit requesting recovery, allow the raid
2891 * set to run and store superblocks during resume.
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002892 */
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002893 r = rs_check_takeover(rs);
2894 if (r)
Heinz Mauelshagenb1956dc2016-06-24 21:49:26 +02002895 goto bad;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002896
2897 r = rs_setup_takeover(rs);
2898 if (r)
Heinz Mauelshagenb1956dc2016-06-24 21:49:26 +02002899 goto bad;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002900
Mike Snitzer42863252016-06-02 12:27:46 -04002901 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
Heinz Mauelshagen6e209022016-06-14 15:23:13 -04002902 set_bit(RT_FLAG_KEEP_RS_FROZEN, &rs->runtime_flags);
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02002903 /* Takeover ain't recovery, so disable recovery */
Heinz Mauelshagen2a5556c2016-06-27 14:44:09 +02002904 rs_setup_recovery(rs, MaxSector);
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02002905 rs_set_new(rs);
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02002906 } else if (rs_reshape_requested(rs)) {
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002907 /*
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02002908 * We can only prepare for a reshape here, because the
2909 * raid set needs to run to provide the repective reshape
2910 * check functions via its MD personality instance.
2911 *
2912 * So do the reshape check after md_run() succeeded.
2913 */
2914 r = rs_prepare_reshape(rs);
2915 if (r)
2916 return r;
Heinz Mauelshagen6e209022016-06-14 15:23:13 -04002917
Heinz Mauelshagen469b3042016-06-29 18:13:58 +02002918 /* Reshaping ain't recovery, so disable recovery */
Heinz Mauelshagen4dff2f12016-06-24 00:21:09 +02002919 rs_setup_recovery(rs, MaxSector);
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02002920 rs_set_cur(rs);
Heinz Mauelshagen2a5556c2016-06-27 14:44:09 +02002921 } else {
2922 /* May not set recovery when a device rebuild is requested */
Heinz Mauelshagen37f10be2016-06-24 23:21:37 +02002923 if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) {
2924 rs_setup_recovery(rs, MaxSector);
2925 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2926 } else
2927 rs_setup_recovery(rs, test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ?
Heinz Mauelshagen2a5556c2016-06-27 14:44:09 +02002928 0 : (resize ? calculated_dev_sectors : MaxSector));
2929 rs_set_cur(rs);
Heinz Mauelshagen4dff2f12016-06-24 00:21:09 +02002930 }
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002931
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02002932 /* If constructor requested it, change data and new_data offsets */
2933 r = rs_adjust_data_offsets(rs);
2934 if (r)
Heinz Mauelshagenb1956dc2016-06-24 21:49:26 +02002935 goto bad;
Heinz Mauelshagen40ba37e2016-06-13 17:55:13 +02002936
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02002937 /* Start raid set read-only and assumed clean to change in raid_resume() */
2938 rs->md.ro = 1;
2939 rs->md.in_sync = 1;
2940 set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
Heinz Mauelshagen75b8e042014-09-24 17:47:18 +02002941
Heinz Mauelshagen0cf45032015-04-29 14:03:04 +02002942 /* Has to be held on running the array */
2943 mddev_lock_nointr(&rs->md);
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002944 r = md_run(&rs->md);
NeilBrown9d09e662011-01-13 20:00:02 +00002945 rs->md.in_sync = 0; /* Assume already marked dirty */
NeilBrown9d09e662011-01-13 20:00:02 +00002946
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002947 if (r) {
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002948 ti->error = "Failed to run raid array";
2949 mddev_unlock(&rs->md);
NeilBrown9d09e662011-01-13 20:00:02 +00002950 goto bad;
2951 }
2952
2953 rs->callbacks.congested_fn = raid_is_congested;
NeilBrown9d09e662011-01-13 20:00:02 +00002954 dm_table_add_target_callbacks(ti->table, &rs->callbacks);
2955
Jonathan Brassow32737272011-08-02 12:32:07 +01002956 mddev_suspend(&rs->md);
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002957
2958 /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
2959 if (rs_is_raid456(rs)) {
2960 r = rs_set_raid456_stripe_cache(rs);
2961 if (r)
2962 goto bad_stripe_cache;
2963 }
2964
2965 /* Now do an early reshape check */
2966 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
2967 r = rs_check_reshape(rs);
2968 if (r)
Heinz Mauelshagenb1956dc2016-06-24 21:49:26 +02002969 goto bad_check_reshape;
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002970
2971 /* Restore new, ctr requested layout to perform check */
2972 rs_config_restore(rs, &rs_layout);
2973
2974 r = rs->md.pers->check_reshape(&rs->md);
2975 if (r) {
2976 ti->error = "Reshape check failed";
2977 goto bad_check_reshape;
2978 }
2979 }
2980
2981 mddev_unlock(&rs->md);
NeilBrown9d09e662011-01-13 20:00:02 +00002982 return 0;
2983
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02002984bad_stripe_cache:
2985bad_check_reshape:
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05002986 md_stop(&rs->md);
NeilBrown9d09e662011-01-13 20:00:02 +00002987bad:
Mike Snitzerbfcee0e2016-06-02 15:08:09 -04002988 raid_set_free(rs);
NeilBrown9d09e662011-01-13 20:00:02 +00002989
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02002990 return r;
NeilBrown9d09e662011-01-13 20:00:02 +00002991}
2992
2993static void raid_dtr(struct dm_target *ti)
2994{
2995 struct raid_set *rs = ti->private;
2996
2997 list_del_init(&rs->callbacks.list);
2998 md_stop(&rs->md);
Mike Snitzerbfcee0e2016-06-02 15:08:09 -04002999 raid_set_free(rs);
NeilBrown9d09e662011-01-13 20:00:02 +00003000}
3001
Mikulas Patocka7de3ee52012-12-21 20:23:41 +00003002static int raid_map(struct dm_target *ti, struct bio *bio)
NeilBrown9d09e662011-01-13 20:00:02 +00003003{
3004 struct raid_set *rs = ti->private;
NeilBrownfd01b882011-10-11 16:47:53 +11003005 struct mddev *mddev = &rs->md;
NeilBrown9d09e662011-01-13 20:00:02 +00003006
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003007 /*
3008 * If we're reshaping to add disk(s)), ti->len and
3009 * mddev->array_sectors will differ during the process
3010 * (ti->len > mddev->array_sectors), so we have to requeue
3011 * bios with addresses > mddev->array_sectors here or
Heinz Mauelshagen2527b562016-06-24 01:03:19 +02003012 * there will occur accesses past EOD of the component
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003013 * data images thus erroring the raid set.
3014 */
3015 if (unlikely(bio_end_sector(bio) > mddev->array_sectors))
3016 return DM_MAPIO_REQUEUE;
3017
NeilBrown9d09e662011-01-13 20:00:02 +00003018 mddev->pers->make_request(mddev, bio);
3019
3020 return DM_MAPIO_SUBMITTED;
3021}
3022
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003023/* Return string describing the current sync action of @mddev */
Jonathan Brassowbe836512013-04-24 11:42:43 +10003024static const char *decipher_sync_action(struct mddev *mddev)
3025{
3026 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
3027 return "frozen";
3028
3029 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3030 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3031 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3032 return "reshape";
3033
3034 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3035 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3036 return "resync";
3037 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3038 return "check";
3039 return "repair";
3040 }
3041
3042 if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3043 return "recover";
3044 }
3045
3046 return "idle";
3047}
3048
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003049/*
3050 * Return status string @rdev
3051 *
3052 * Status characters:
3053 *
3054 * 'D' = Dead/Failed device
3055 * 'a' = Alive but not in-sync
3056 * 'A' = Alive and in-sync
3057 */
Mike Snitzere6ca5e12016-06-02 15:27:22 -04003058static const char *__raid_dev_status(struct md_rdev *rdev, bool array_in_sync)
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003059{
3060 if (test_bit(Faulty, &rdev->flags))
3061 return "D";
3062 else if (!array_in_sync || !test_bit(In_sync, &rdev->flags))
3063 return "a";
3064 else
3065 return "A";
3066}
3067
3068/* Helper to return resync/reshape progress for @rs and @array_in_sync */
3069static sector_t rs_get_progress(struct raid_set *rs,
3070 sector_t resync_max_sectors, bool *array_in_sync)
3071{
3072 sector_t r, recovery_cp, curr_resync_completed;
3073 struct mddev *mddev = &rs->md;
3074
3075 curr_resync_completed = mddev->curr_resync_completed ?: mddev->recovery_cp;
3076 recovery_cp = mddev->recovery_cp;
3077 *array_in_sync = false;
3078
3079 if (rs_is_raid0(rs)) {
3080 r = resync_max_sectors;
3081 *array_in_sync = true;
3082
3083 } else {
3084 r = mddev->reshape_position;
3085
3086 /* Reshape is relative to the array size */
3087 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
3088 r != MaxSector) {
3089 if (r == MaxSector) {
3090 *array_in_sync = true;
3091 r = resync_max_sectors;
3092 } else {
3093 /* Got to reverse on backward reshape */
3094 if (mddev->reshape_backwards)
3095 r = mddev->array_sectors - r;
3096
3097 /* Devide by # of data stripes */
3098 sector_div(r, mddev_data_stripes(rs));
3099 }
3100
3101 /* Sync is relative to the component device size */
3102 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3103 r = curr_resync_completed;
3104 else
3105 r = recovery_cp;
3106
3107 if (r == MaxSector) {
3108 /*
3109 * Sync complete.
3110 */
3111 *array_in_sync = true;
3112 r = resync_max_sectors;
3113 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
3114 /*
3115 * If "check" or "repair" is occurring, the raid set has
3116 * undergone an initial sync and the health characters
3117 * should not be 'a' anymore.
3118 */
3119 *array_in_sync = true;
3120 } else {
3121 struct md_rdev *rdev;
3122
3123 /*
3124 * The raid set may be doing an initial sync, or it may
Mike Snitzer43157842016-05-30 13:03:37 -04003125 * be rebuilding individual components. If all the
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003126 * devices are In_sync, then it is the raid set that is
3127 * being initialized.
3128 */
3129 rdev_for_each(rdev, mddev)
3130 if (!test_bit(In_sync, &rdev->flags))
3131 *array_in_sync = true;
3132#if 0
3133 r = 0; /* HM FIXME: TESTME: https://bugzilla.redhat.com/show_bug.cgi?id=1210637 ? */
3134#endif
3135 }
3136 }
3137
3138 return r;
3139}
3140
3141/* Helper to return @dev name or "-" if !@dev */
Mike Snitzere6ca5e12016-06-02 15:27:22 -04003142static const char *__get_dev_name(struct dm_dev *dev)
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003143{
3144 return dev ? dev->name : "-";
3145}
3146
Mikulas Patockafd7c0922013-03-01 22:45:44 +00003147static void raid_status(struct dm_target *ti, status_type_t type,
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003148 unsigned int status_flags, char *result, unsigned int maxlen)
NeilBrown9d09e662011-01-13 20:00:02 +00003149{
3150 struct raid_set *rs = ti->private;
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003151 struct mddev *mddev = &rs->md;
3152 struct r5conf *conf = mddev->private;
3153 int max_nr_stripes = conf ? conf->max_nr_stripes : 0;
3154 bool array_in_sync;
3155 unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */
3156 unsigned int sz = 0;
3157 unsigned int write_mostly_params = 0;
3158 sector_t progress, resync_max_sectors, resync_mismatches;
3159 const char *sync_action;
3160 struct raid_type *rt;
3161 struct md_rdev *rdev;
NeilBrown9d09e662011-01-13 20:00:02 +00003162
3163 switch (type) {
3164 case STATUSTYPE_INFO:
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003165 /* *Should* always succeed */
3166 rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
3167 if (!rt)
3168 return;
NeilBrown9d09e662011-01-13 20:00:02 +00003169
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003170 DMEMIT("%s %d ", rt->name, mddev->raid_disks);
NeilBrown9d09e662011-01-13 20:00:02 +00003171
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003172 /* Access most recent mddev properties for status output */
3173 smp_rmb();
3174 /* Get sensible max sectors even if raid set not yet started */
Mike Snitzer42863252016-06-02 12:27:46 -04003175 resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ?
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003176 mddev->resync_max_sectors : mddev->dev_sectors;
3177 progress = rs_get_progress(rs, resync_max_sectors, &array_in_sync);
3178 resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ?
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003179 atomic64_read(&mddev->resync_mismatches) : 0;
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003180 sync_action = decipher_sync_action(&rs->md);
3181
3182 /* HM FIXME: do we want another state char for raid0? It shows 'D' or 'A' now */
3183 rdev_for_each(rdev, mddev)
Mike Snitzere6ca5e12016-06-02 15:27:22 -04003184 DMEMIT(__raid_dev_status(rdev, array_in_sync));
Jonathan Brassowbe836512013-04-24 11:42:43 +10003185
Jonathan E Brassow2e727c32011-10-31 20:21:26 +00003186 /*
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003187 * In-sync/Reshape ratio:
Jonathan E Brassow2e727c32011-10-31 20:21:26 +00003188 * The in-sync ratio shows the progress of:
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003189 * - Initializing the raid set
3190 * - Rebuilding a subset of devices of the raid set
Jonathan E Brassow2e727c32011-10-31 20:21:26 +00003191 * The user can distinguish between the two by referring
3192 * to the status characters.
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003193 *
3194 * The reshape ratio shows the progress of
3195 * changing the raid layout or the number of
3196 * disks of a raid set
Jonathan E Brassow2e727c32011-10-31 20:21:26 +00003197 */
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003198 DMEMIT(" %llu/%llu", (unsigned long long) progress,
3199 (unsigned long long) resync_max_sectors);
NeilBrown9d09e662011-01-13 20:00:02 +00003200
Jonathan Brassowbe836512013-04-24 11:42:43 +10003201 /*
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003202 * v1.5.0+:
3203 *
Jonathan Brassowbe836512013-04-24 11:42:43 +10003204 * Sync action:
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003205 * See Documentation/device-mapper/dm-raid.txt for
Jonathan Brassowbe836512013-04-24 11:42:43 +10003206 * information on each of these states.
3207 */
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003208 DMEMIT(" %s", sync_action);
Jonathan Brassowbe836512013-04-24 11:42:43 +10003209
3210 /*
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003211 * v1.5.0+:
3212 *
Jonathan Brassowbe836512013-04-24 11:42:43 +10003213 * resync_mismatches/mismatch_cnt
3214 * This field shows the number of discrepancies found when
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003215 * performing a "check" of the raid set.
Jonathan Brassowbe836512013-04-24 11:42:43 +10003216 */
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003217 DMEMIT(" %llu", (unsigned long long) resync_mismatches);
3218
3219 /*
Mike Snitzer9b6e5422016-06-02 11:48:09 -04003220 * v1.9.0+:
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003221 *
3222 * data_offset (needed for out of space reshaping)
3223 * This field shows the data offset into the data
3224 * image LV where the first stripes data starts.
3225 *
3226 * We keep data_offset equal on all raid disks of the set,
3227 * so retrieving it from the first raid disk is sufficient.
3228 */
3229 DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset);
NeilBrown9d09e662011-01-13 20:00:02 +00003230 break;
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003231
NeilBrown9d09e662011-01-13 20:00:02 +00003232 case STATUSTYPE_TABLE:
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003233 /* Report the table line string you would use to construct this raid set */
NeilBrown9d09e662011-01-13 20:00:02 +00003234
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003235 /* Calculate raid parameter count */
3236 rdev_for_each(rdev, mddev)
3237 if (test_bit(WriteMostly, &rdev->flags))
3238 write_mostly_params += 2;
3239 raid_param_cnt += memweight(rs->rebuild_disks,
3240 DISKS_ARRAY_ELEMS * sizeof(*rs->rebuild_disks)) * 2 +
3241 write_mostly_params +
3242 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) +
3243 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2;
3244 /* Emit table line */
3245 DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors);
Mike Snitzer42863252016-06-02 12:27:46 -04003246 if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003247 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003248 raid10_md_layout_to_format(mddev->layout));
Mike Snitzer42863252016-06-02 12:27:46 -04003249 if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003250 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003251 raid10_md_layout_to_copies(mddev->layout));
Mike Snitzer42863252016-06-02 12:27:46 -04003252 if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003253 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
Mike Snitzer42863252016-06-02 12:27:46 -04003254 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003255 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));
Mike Snitzer42863252016-06-02 12:27:46 -04003256 if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003257 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003258 (unsigned long long) to_sector(mddev->bitmap_info.chunksize));
Mike Snitzer42863252016-06-02 12:27:46 -04003259 if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003260 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003261 (unsigned long long) rs->data_offset);
Mike Snitzer42863252016-06-02 12:27:46 -04003262 if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003263 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003264 mddev->bitmap_info.daemon_sleep);
Mike Snitzer42863252016-06-02 12:27:46 -04003265 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003266 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003267 mddev->delta_disks);
Mike Snitzer42863252016-06-02 12:27:46 -04003268 if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003269 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003270 max_nr_stripes);
3271 rdev_for_each(rdev, mddev)
3272 if (test_bit(rdev->raid_disk, (void *) rs->rebuild_disks))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003273 DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003274 rdev->raid_disk);
3275 rdev_for_each(rdev, mddev)
3276 if (test_bit(WriteMostly, &rdev->flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003277 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003278 rdev->raid_disk);
Mike Snitzer42863252016-06-02 12:27:46 -04003279 if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003280 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003281 mddev->bitmap_info.max_write_behind);
Mike Snitzer42863252016-06-02 12:27:46 -04003282 if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003283 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003284 mddev->sync_speed_max);
Mike Snitzer42863252016-06-02 12:27:46 -04003285 if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
Mike Snitzer3fa6cf32016-06-02 11:58:51 -04003286 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003287 mddev->sync_speed_min);
3288 DMEMIT(" %d", rs->raid_disks);
3289 rdev_for_each(rdev, mddev) {
3290 struct raid_dev *rd = container_of(rdev, struct raid_dev, rdev);
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05003291
Mike Snitzere6ca5e12016-06-02 15:27:22 -04003292 DMEMIT(" %s %s", __get_dev_name(rd->meta_dev),
3293 __get_dev_name(rd->data_dev));
NeilBrown9d09e662011-01-13 20:00:02 +00003294 }
3295 }
NeilBrown9d09e662011-01-13 20:00:02 +00003296}
3297
Jonathan Brassowbe836512013-04-24 11:42:43 +10003298static int raid_message(struct dm_target *ti, unsigned argc, char **argv)
3299{
3300 struct raid_set *rs = ti->private;
3301 struct mddev *mddev = &rs->md;
3302
Jonathan Brassowbe836512013-04-24 11:42:43 +10003303 if (!mddev->pers || !mddev->pers->sync_request)
3304 return -EINVAL;
3305
3306 if (!strcasecmp(argv[0], "frozen"))
3307 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3308 else
3309 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3310
3311 if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) {
3312 if (mddev->sync_thread) {
3313 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3314 md_reap_sync_thread(mddev);
3315 }
3316 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3317 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3318 return -EBUSY;
3319 else if (!strcasecmp(argv[0], "resync"))
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003320 ; /* MD_RECOVERY_NEEDED set below */
3321 else if (!strcasecmp(argv[0], "recover"))
Jonathan Brassowbe836512013-04-24 11:42:43 +10003322 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003323 else {
Jonathan Brassowbe836512013-04-24 11:42:43 +10003324 if (!strcasecmp(argv[0], "check"))
3325 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3326 else if (!!strcasecmp(argv[0], "repair"))
3327 return -EINVAL;
3328 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3329 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3330 }
3331 if (mddev->ro == 2) {
3332 /* A write to sync_action is enough to justify
3333 * canceling read-auto mode
3334 */
3335 mddev->ro = 0;
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003336 if (!mddev->suspended && mddev->sync_thread)
Jonathan Brassowbe836512013-04-24 11:42:43 +10003337 md_wakeup_thread(mddev->sync_thread);
3338 }
3339 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003340 if (!mddev->suspended && mddev->thread)
Jonathan Brassowbe836512013-04-24 11:42:43 +10003341 md_wakeup_thread(mddev->thread);
3342
3343 return 0;
3344}
3345
3346static int raid_iterate_devices(struct dm_target *ti,
3347 iterate_devices_callout_fn fn, void *data)
NeilBrown9d09e662011-01-13 20:00:02 +00003348{
3349 struct raid_set *rs = ti->private;
3350 unsigned i;
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02003351 int r = 0;
NeilBrown9d09e662011-01-13 20:00:02 +00003352
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02003353 for (i = 0; !r && i < rs->md.raid_disks; i++)
NeilBrown9d09e662011-01-13 20:00:02 +00003354 if (rs->dev[i].data_dev)
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02003355 r = fn(ti,
NeilBrown9d09e662011-01-13 20:00:02 +00003356 rs->dev[i].data_dev,
3357 0, /* No offset on data devs */
3358 rs->md.dev_sectors,
3359 data);
3360
Heinz Mauelshagen73c6f232016-05-19 18:49:24 +02003361 return r;
NeilBrown9d09e662011-01-13 20:00:02 +00003362}
3363
3364static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
3365{
3366 struct raid_set *rs = ti->private;
3367 unsigned chunk_size = rs->md.chunk_sectors << 9;
NeilBrownd1688a62011-10-11 16:49:52 +11003368 struct r5conf *conf = rs->md.private;
NeilBrown9d09e662011-01-13 20:00:02 +00003369
3370 blk_limits_io_min(limits, chunk_size);
3371 blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded));
3372}
3373
3374static void raid_presuspend(struct dm_target *ti)
3375{
3376 struct raid_set *rs = ti->private;
3377
3378 md_stop_writes(&rs->md);
3379}
3380
3381static void raid_postsuspend(struct dm_target *ti)
3382{
3383 struct raid_set *rs = ti->private;
3384
Heinz Mauelshagen6e209022016-06-14 15:23:13 -04003385 if (test_and_clear_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
3386 if (!rs->md.suspended)
3387 mddev_suspend(&rs->md);
3388 rs->md.ro = 1;
3389 }
NeilBrown9d09e662011-01-13 20:00:02 +00003390}
3391
Jonathan Brassowf381e712013-05-08 17:57:13 -05003392static void attempt_restore_of_faulty_devices(struct raid_set *rs)
NeilBrown9d09e662011-01-13 20:00:02 +00003393{
Jonathan Brassow9092c022013-05-02 14:19:24 -05003394 int i;
3395 uint64_t failed_devices, cleared_failed_devices = 0;
3396 unsigned long flags;
3397 struct dm_raid_superblock *sb;
Jonathan Brassow9092c022013-05-02 14:19:24 -05003398 struct md_rdev *r;
NeilBrown9d09e662011-01-13 20:00:02 +00003399
Jonathan Brassowf381e712013-05-08 17:57:13 -05003400 for (i = 0; i < rs->md.raid_disks; i++) {
3401 r = &rs->dev[i].rdev;
3402 if (test_bit(Faulty, &r->flags) && r->sb_page &&
Heinz Mauelshagen0a7b8182016-06-15 18:45:56 +02003403 sync_page_io(r, 0, r->sb_size, r->sb_page,
3404 REQ_OP_READ, 0, true)) {
Jonathan Brassowf381e712013-05-08 17:57:13 -05003405 DMINFO("Faulty %s device #%d has readable super block."
3406 " Attempting to revive it.",
3407 rs->raid_type->name, i);
Jonathan Brassowa4dc1632013-05-08 18:00:54 -05003408
3409 /*
3410 * Faulty bit may be set, but sometimes the array can
3411 * be suspended before the personalities can respond
3412 * by removing the device from the array (i.e. calling
Mike Snitzer43157842016-05-30 13:03:37 -04003413 * 'hot_remove_disk'). If they haven't yet removed
Jonathan Brassowa4dc1632013-05-08 18:00:54 -05003414 * the failed device, its 'raid_disk' number will be
3415 * '>= 0' - meaning we must call this function
3416 * ourselves.
3417 */
3418 if ((r->raid_disk >= 0) &&
3419 (r->mddev->pers->hot_remove_disk(r->mddev, r) != 0))
3420 /* Failed to revive this device, try next */
3421 continue;
3422
Jonathan Brassowf381e712013-05-08 17:57:13 -05003423 r->raid_disk = i;
3424 r->saved_raid_disk = i;
3425 flags = r->flags;
3426 clear_bit(Faulty, &r->flags);
3427 clear_bit(WriteErrorSeen, &r->flags);
3428 clear_bit(In_sync, &r->flags);
3429 if (r->mddev->pers->hot_add_disk(r->mddev, r)) {
3430 r->raid_disk = -1;
3431 r->saved_raid_disk = -1;
3432 r->flags = flags;
3433 } else {
3434 r->recovery_offset = 0;
3435 cleared_failed_devices |= 1 << i;
3436 }
3437 }
3438 }
3439 if (cleared_failed_devices) {
3440 rdev_for_each(r, &rs->md) {
3441 sb = page_address(r->sb_page);
3442 failed_devices = le64_to_cpu(sb->failed_devices);
3443 failed_devices &= ~cleared_failed_devices;
3444 sb->failed_devices = cpu_to_le64(failed_devices);
3445 }
3446 }
3447}
3448
Mike Snitzere6ca5e12016-06-02 15:27:22 -04003449static int __load_dirty_region_bitmap(struct raid_set *rs)
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003450{
3451 int r = 0;
3452
3453 /* Try loading the bitmap unless "raid0", which does not have one */
3454 if (!rs_is_raid0(rs) &&
Mike Snitzer42863252016-06-02 12:27:46 -04003455 !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) {
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003456 r = bitmap_load(&rs->md);
3457 if (r)
3458 DMERR("Failed to load bitmap");
3459 }
3460
3461 return r;
3462}
3463
Heinz Mauelshagen6e209022016-06-14 15:23:13 -04003464/* Enforce updating all superblocks */
3465static void rs_update_sbs(struct raid_set *rs)
3466{
3467 struct mddev *mddev = &rs->md;
3468 int ro = mddev->ro;
3469
3470 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3471 mddev->ro = 0;
3472 md_update_sb(mddev, 1);
3473 mddev->ro = ro;
3474}
3475
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003476/*
3477 * Reshape changes raid algorithm of @rs to new one within personality
3478 * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes
3479 * disks from a raid set thus growing/shrinking it or resizes the set
3480 *
3481 * Call mddev_lock_nointr() before!
3482 */
3483static int rs_start_reshape(struct raid_set *rs)
3484{
3485 int r;
3486 struct mddev *mddev = &rs->md;
3487 struct md_personality *pers = mddev->pers;
3488
3489 r = rs_setup_reshape(rs);
3490 if (r)
3491 return r;
3492
3493 /* Need to be resumed to be able to start reshape, recovery is frozen until raid_resume() though */
3494 if (mddev->suspended)
3495 mddev_resume(mddev);
3496
3497 /*
3498 * Check any reshape constraints enforced by the personalility
3499 *
3500 * May as well already kick the reshape off so that * pers->start_reshape() becomes optional.
3501 */
3502 r = pers->check_reshape(mddev);
3503 if (r) {
3504 rs->ti->error = "pers->check_reshape() failed";
3505 return r;
3506 }
3507
3508 /*
3509 * Personality may not provide start reshape method in which
3510 * case check_reshape above has already covered everything
3511 */
3512 if (pers->start_reshape) {
3513 r = pers->start_reshape(mddev);
3514 if (r) {
3515 rs->ti->error = "pers->start_reshape() failed";
3516 return r;
3517 }
3518 }
3519
3520 /* Suspend because a resume will happen in raid_resume() */
3521 if (!mddev->suspended)
3522 mddev_suspend(mddev);
3523
Heinz Mauelshagen6e209022016-06-14 15:23:13 -04003524 /*
3525 * Now reshape got set up, update superblocks to
3526 * reflect the fact so that a table reload will
3527 * access proper superblock content in the ctr.
3528 */
3529 rs_update_sbs(rs);
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003530
3531 return 0;
3532}
3533
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003534static int raid_preresume(struct dm_target *ti)
3535{
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003536 int r;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003537 struct raid_set *rs = ti->private;
3538 struct mddev *mddev = &rs->md;
3539
3540 /* This is a resume after a suspend of the set -> it's already started */
Mike Snitzer42863252016-06-02 12:27:46 -04003541 if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags))
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003542 return 0;
3543
3544 /*
3545 * The superblocks need to be updated on disk if the
Heinz Mauelshagen6e209022016-06-14 15:23:13 -04003546 * array is new or new devices got added (thus zeroed
3547 * out by userspace) or __load_dirty_region_bitmap
3548 * will overwrite them in core with old data or fail.
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003549 */
Heinz Mauelshagen6e209022016-06-14 15:23:13 -04003550 if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags))
3551 rs_update_sbs(rs);
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003552
3553 /*
3554 * Disable/enable discard support on raid set after any
3555 * conversion, because devices can have been added
3556 */
3557 configure_discard_support(rs);
3558
3559 /* Load the bitmap from disk unless raid0 */
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003560 r = __load_dirty_region_bitmap(rs);
3561 if (r)
3562 return r;
3563
Heinz Mauelshagen4257e082016-06-14 01:46:03 +02003564 /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) */
3565 if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) &&
3566 mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)) {
3567 r = bitmap_resize(mddev->bitmap, mddev->dev_sectors,
3568 to_bytes(rs->requested_bitmap_chunk_sectors), 0);
3569 if (r)
3570 DMERR("Failed to resize bitmap");
3571 }
3572
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003573 /* Check for any resize/reshape on @rs and adjust/initiate */
3574 /* Be prepared for mddev_resume() in raid_resume() */
3575 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3576 if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) {
3577 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3578 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3579 mddev->resync_min = mddev->recovery_cp;
3580 }
3581
3582 rs_set_capacity(rs);
3583
Heinz Mauelshagen345a6cd2016-06-25 02:42:54 +02003584 /* Check for any reshape request unless new raid set */
Heinz Mauelshagen9dbd1aa2016-06-13 17:55:14 +02003585 if (test_and_clear_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3586 /* Initiate a reshape. */
3587 mddev_lock_nointr(mddev);
3588 r = rs_start_reshape(rs);
3589 mddev_unlock(mddev);
3590 if (r)
3591 DMWARN("Failed to check/start reshape, continuing without change");
3592 r = 0;
3593 }
3594
3595 return r;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003596}
3597
Jonathan Brassowf381e712013-05-08 17:57:13 -05003598static void raid_resume(struct dm_target *ti)
3599{
3600 struct raid_set *rs = ti->private;
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003601 struct mddev *mddev = &rs->md;
Jonathan Brassowf381e712013-05-08 17:57:13 -05003602
Mike Snitzer42863252016-06-02 12:27:46 -04003603 if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003604 /*
3605 * A secondary resume while the device is active.
3606 * Take this opportunity to check whether any failed
3607 * devices are reachable again.
3608 */
3609 attempt_restore_of_faulty_devices(rs);
Heinz Mauelshagen6e209022016-06-14 15:23:13 -04003610 } else {
3611 mddev->ro = 0;
3612 mddev->in_sync = 0;
3613
3614 /*
3615 * When passing in flags to the ctr, we expect userspace
3616 * to reset them because they made it to the superblocks
3617 * and reload the mapping anyway.
3618 *
3619 * -> only unfreeze recovery in case of a table reload or
3620 * we'll have a bogus recovery/reshape position
3621 * retrieved from the superblock by the ctr because
3622 * the ongoing recovery/reshape will change it after read.
3623 */
3624 if (!test_bit(RT_FLAG_KEEP_RS_FROZEN, &rs->runtime_flags))
3625 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3626
3627 if (mddev->suspended)
3628 mddev_resume(mddev);
Jonathan Brassow47525e52012-05-22 13:55:29 +10003629 }
NeilBrown9d09e662011-01-13 20:00:02 +00003630}
3631
3632static struct target_type raid_target = {
3633 .name = "raid",
Mike Snitzer9b6e5422016-06-02 11:48:09 -04003634 .version = {1, 9, 0},
NeilBrown9d09e662011-01-13 20:00:02 +00003635 .module = THIS_MODULE,
3636 .ctr = raid_ctr,
3637 .dtr = raid_dtr,
3638 .map = raid_map,
3639 .status = raid_status,
Jonathan Brassowbe836512013-04-24 11:42:43 +10003640 .message = raid_message,
NeilBrown9d09e662011-01-13 20:00:02 +00003641 .iterate_devices = raid_iterate_devices,
3642 .io_hints = raid_io_hints,
3643 .presuspend = raid_presuspend,
3644 .postsuspend = raid_postsuspend,
Heinz Mauelshagenecbfb9f2016-05-19 18:49:33 +02003645 .preresume = raid_preresume,
NeilBrown9d09e662011-01-13 20:00:02 +00003646 .resume = raid_resume,
3647};
3648
3649static int __init dm_raid_init(void)
3650{
Jonathan Brassowfe5d2f42013-02-21 13:28:10 +11003651 DMINFO("Loading target version %u.%u.%u",
3652 raid_target.version[0],
3653 raid_target.version[1],
3654 raid_target.version[2]);
NeilBrown9d09e662011-01-13 20:00:02 +00003655 return dm_register_target(&raid_target);
3656}
3657
3658static void __exit dm_raid_exit(void)
3659{
3660 dm_unregister_target(&raid_target);
3661}
3662
3663module_init(dm_raid_init);
3664module_exit(dm_raid_exit);
3665
Heinz Mauelshagen48cf06b2014-09-24 17:47:19 +02003666module_param(devices_handle_discard_safely, bool, 0644);
3667MODULE_PARM_DESC(devices_handle_discard_safely,
3668 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
3669
Mike Snitzeref9b85a2016-06-02 12:02:19 -04003670MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target");
3671MODULE_ALIAS("dm-raid0");
Jonathan Brassow63f33b8d2012-07-31 21:44:26 -05003672MODULE_ALIAS("dm-raid1");
3673MODULE_ALIAS("dm-raid10");
NeilBrown9d09e662011-01-13 20:00:02 +00003674MODULE_ALIAS("dm-raid4");
3675MODULE_ALIAS("dm-raid5");
3676MODULE_ALIAS("dm-raid6");
3677MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
Heinz Mauelshagen3a1c1ef2016-05-19 18:49:34 +02003678MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>");
NeilBrown9d09e662011-01-13 20:00:02 +00003679MODULE_LICENSE("GPL");