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Commit | Line | Data |
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9d09e663 N |
1 | /* |
2 | * Copyright (C) 2010-2011 Neil Brown | |
702108d1 | 3 | * Copyright (C) 2010-2016 Red Hat, Inc. All rights reserved. |
9d09e663 N |
4 | * |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
8 | #include <linux/slab.h> | |
056075c7 | 9 | #include <linux/module.h> |
9d09e663 N |
10 | |
11 | #include "md.h" | |
32737279 | 12 | #include "raid1.h" |
9d09e663 | 13 | #include "raid5.h" |
63f33b8d | 14 | #include "raid10.h" |
9d09e663 N |
15 | #include "bitmap.h" |
16 | ||
3e8dbb7f AK |
17 | #include <linux/device-mapper.h> |
18 | ||
9d09e663 | 19 | #define DM_MSG_PREFIX "raid" |
92c83d79 | 20 | #define MAX_RAID_DEVICES 253 /* md-raid kernel limit */ |
9d09e663 | 21 | |
40ba37e5 HM |
22 | /* |
23 | * Minimum sectors of free reshape space per raid device | |
24 | */ | |
25 | #define MIN_FREE_RESHAPE_SPACE to_sector(4*4096) | |
26 | ||
48cf06bc HM |
27 | static bool devices_handle_discard_safely = false; |
28 | ||
9d09e663 | 29 | /* |
b12d437b JB |
30 | * 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. | |
9d09e663 | 32 | */ |
43157840 | 33 | #define FirstUse 10 /* rdev flag */ |
9d09e663 N |
34 | |
35 | struct raid_dev { | |
36 | /* | |
37 | * Two DM devices, one to hold metadata and one to hold the | |
43157840 | 38 | * actual data/parity. The reason for this is to not confuse |
9d09e663 N |
39 | * 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; | |
3cb03002 | 50 | struct md_rdev rdev; |
9d09e663 N |
51 | }; |
52 | ||
53 | /* | |
4286325b | 54 | * Bits for establishing rs->ctr_flags |
702108d1 HM |
55 | * |
56 | * 1 = no flag value | |
57 | * 2 = flag with value | |
9d09e663 | 58 | */ |
4286325b MS |
59 | #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 */ | |
9b6e5423 | 71 | /* New for v1.9.0 */ |
d7ccc2e2 | 72 | #define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid1/4/5/6/10! */ |
4286325b MS |
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) | |
63f33b8d | 94 | |
f090279e HM |
95 | /* |
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') */ | |
33e53f06 HM |
104 | #define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \ |
105 | CTR_FLAG_RAID10_USE_NEAR_SETS) | |
f090279e HM |
106 | |
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 | \ | |
33e53f06 HM |
117 | CTR_FLAG_RAID10_FORMAT | \ |
118 | CTR_FLAG_DELTA_DISKS | \ | |
119 | CTR_FLAG_DATA_OFFSET) | |
f090279e | 120 | |
a30cbc0d HM |
121 | /* Valid options definitions per raid level... */ |
122 | ||
123 | /* "raid0" does only accept data offset */ | |
124 | #define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET) | |
125 | ||
126 | /* "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 | \ | |
7a7c330f | 135 | CTR_FLAG_DELTA_DISKS | \ |
a30cbc0d | 136 | CTR_FLAG_DATA_OFFSET) |
f090279e | 137 | |
a30cbc0d HM |
138 | /* "raid10" does not accept any raid1 or stripe cache options */ |
139 | #define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \ | |
140 | CTR_FLAG_REBUILD | \ | |
141 | CTR_FLAG_DAEMON_SLEEP | \ | |
142 | CTR_FLAG_MIN_RECOVERY_RATE | \ | |
143 | CTR_FLAG_MAX_RECOVERY_RATE | \ | |
144 | CTR_FLAG_REGION_SIZE | \ | |
f090279e | 145 | CTR_FLAG_RAID10_COPIES | \ |
33e53f06 HM |
146 | CTR_FLAG_RAID10_FORMAT | \ |
147 | CTR_FLAG_DELTA_DISKS | \ | |
a30cbc0d HM |
148 | CTR_FLAG_DATA_OFFSET | \ |
149 | CTR_FLAG_RAID10_USE_NEAR_SETS) | |
f090279e | 150 | |
f090279e HM |
151 | /* |
152 | * "raid4/5/6" do not accept any raid1 or raid10 specific options | |
153 | * | |
154 | * "raid6" does not accept "nosync", because it is not guaranteed | |
155 | * that both parity and q-syndrome are being written properly with | |
156 | * any writes | |
157 | */ | |
a30cbc0d HM |
158 | #define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \ |
159 | CTR_FLAG_REBUILD | \ | |
160 | CTR_FLAG_DAEMON_SLEEP | \ | |
161 | CTR_FLAG_MIN_RECOVERY_RATE | \ | |
162 | CTR_FLAG_MAX_RECOVERY_RATE | \ | |
f090279e | 163 | CTR_FLAG_MAX_WRITE_BEHIND | \ |
a30cbc0d HM |
164 | CTR_FLAG_STRIPE_CACHE | \ |
165 | CTR_FLAG_REGION_SIZE | \ | |
166 | CTR_FLAG_DELTA_DISKS | \ | |
167 | CTR_FLAG_DATA_OFFSET) | |
168 | ||
169 | #define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \ | |
170 | CTR_FLAG_REBUILD | \ | |
171 | CTR_FLAG_DAEMON_SLEEP | \ | |
172 | CTR_FLAG_MIN_RECOVERY_RATE | \ | |
173 | CTR_FLAG_MAX_RECOVERY_RATE | \ | |
174 | CTR_FLAG_MAX_WRITE_BEHIND | \ | |
175 | CTR_FLAG_STRIPE_CACHE | \ | |
176 | CTR_FLAG_REGION_SIZE | \ | |
177 | CTR_FLAG_DELTA_DISKS | \ | |
178 | CTR_FLAG_DATA_OFFSET) | |
179 | /* ...valid options definitions per raid level */ | |
f090279e | 180 | |
ecbfb9f1 HM |
181 | /* |
182 | * Flags for rs->runtime_flags field | |
183 | * (RT_FLAG prefix meaning "runtime flag") | |
184 | * | |
185 | * These are all internal and used to define runtime state, | |
186 | * e.g. to prevent another resume from preresume processing | |
187 | * the raid set all over again. | |
188 | */ | |
40ba37e5 HM |
189 | #define RT_FLAG_RS_PRERESUMED 0 |
190 | #define RT_FLAG_RS_RESUMED 1 | |
191 | #define RT_FLAG_RS_BITMAP_LOADED 2 | |
192 | #define RT_FLAG_UPDATE_SBS 3 | |
9dbd1aa3 | 193 | #define RT_FLAG_RESHAPE_RS 4 |
ecbfb9f1 | 194 | |
d7ccc2e2 | 195 | /* Array elements of 64 bit needed for rebuild/failed disk bits */ |
33e53f06 HM |
196 | #define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8) |
197 | ||
ecbfb9f1 HM |
198 | /* |
199 | * raid set level, layout and chunk sectors backup/restore | |
200 | */ | |
201 | struct rs_layout { | |
202 | int new_level; | |
203 | int new_layout; | |
204 | int new_chunk_sectors; | |
205 | }; | |
206 | ||
9d09e663 N |
207 | struct raid_set { |
208 | struct dm_target *ti; | |
209 | ||
34f8ac6d | 210 | uint32_t bitmap_loaded; |
9dbd1aa3 | 211 | uint32_t stripe_cache_entries; |
4286325b MS |
212 | unsigned long ctr_flags; |
213 | unsigned long runtime_flags; | |
ecbfb9f1 HM |
214 | |
215 | uint64_t rebuild_disks[DISKS_ARRAY_ELEMS]; | |
9d09e663 | 216 | |
33e53f06 HM |
217 | int raid_disks; |
218 | int delta_disks; | |
4763e543 | 219 | int data_offset; |
33e53f06 | 220 | int raid10_copies; |
4257e085 | 221 | int requested_bitmap_chunk_sectors; |
33e53f06 | 222 | |
fd01b88c | 223 | struct mddev md; |
9d09e663 N |
224 | struct raid_type *raid_type; |
225 | struct dm_target_callbacks callbacks; | |
226 | ||
227 | struct raid_dev dev[0]; | |
228 | }; | |
229 | ||
9dbd1aa3 | 230 | static void rs_config_backup(struct raid_set *rs, struct rs_layout *l) |
ecbfb9f1 HM |
231 | { |
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 | ||
9dbd1aa3 | 239 | static void rs_config_restore(struct raid_set *rs, struct rs_layout *l) |
ecbfb9f1 HM |
240 | { |
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 | ||
33e53f06 HM |
248 | /* 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 | ||
9d09e663 N |
254 | /* Supported raid types and properties. */ |
255 | static struct raid_type { | |
256 | const char *name; /* RAID algorithm. */ | |
257 | const char *descr; /* Descriptor text for logging. */ | |
094f394d HM |
258 | const unsigned int parity_devs; /* # of parity devices. */ |
259 | const unsigned int minimal_devs;/* minimal # of devices in set. */ | |
260 | const unsigned int level; /* RAID level. */ | |
261 | const unsigned int algorithm; /* RAID algorithm. */ | |
9d09e663 | 262 | } raid_types[] = { |
43157840 MS |
263 | {"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}, | |
33e53f06 | 266 | {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET}, |
43157840 MS |
267 | {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR}, |
268 | {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT}, | |
b052b07c | 269 | {"raid4", "raid4 (dedicated first parity disk)", 1, 2, 5, ALGORITHM_PARITY_0}, /* raid4 layout = raid5_0 */ |
43157840 MS |
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} | |
9d09e663 N |
283 | }; |
284 | ||
92c83d79 | 285 | /* True, if @v is in inclusive range [@min, @max] */ |
bb91a63f | 286 | static bool __within_range(long v, long min, long max) |
92c83d79 HM |
287 | { |
288 | return v >= min && v <= max; | |
289 | } | |
290 | ||
702108d1 HM |
291 | /* All table line arguments are defined here */ |
292 | static struct arg_name_flag { | |
4286325b | 293 | const unsigned long flag; |
702108d1 | 294 | const char *name; |
e6ca5e1a | 295 | } __arg_name_flags[] = { |
702108d1 HM |
296 | { 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"}, | |
65359ee6 | 303 | { CTR_FLAG_WRITE_MOSTLY, "write_mostly"}, |
702108d1 HM |
304 | { 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"}, | |
4763e543 HM |
308 | { CTR_FLAG_DATA_OFFSET, "data_offset"}, |
309 | { CTR_FLAG_DELTA_DISKS, "delta_disks"}, | |
310 | { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"}, | |
702108d1 HM |
311 | }; |
312 | ||
313 | /* Return argument name string for given @flag */ | |
3fa6cf38 | 314 | static const char *dm_raid_arg_name_by_flag(const uint32_t flag) |
702108d1 HM |
315 | { |
316 | if (hweight32(flag) == 1) { | |
e6ca5e1a | 317 | struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags); |
702108d1 | 318 | |
e6ca5e1a | 319 | while (anf-- > __arg_name_flags) |
4286325b | 320 | if (flag & anf->flag) |
702108d1 HM |
321 | return anf->name; |
322 | ||
323 | } else | |
324 | DMERR("%s called with more than one flag!", __func__); | |
325 | ||
326 | return NULL; | |
327 | } | |
328 | ||
33e53f06 | 329 | /* |
d7ccc2e2 HM |
330 | * Bool helpers to test for various raid levels of a raid set. |
331 | * It's level as reported by the superblock rather than | |
33e53f06 HM |
332 | * the requested raid_type passed to the constructor. |
333 | */ | |
334 | /* Return true, if raid set in @rs is raid0 */ | |
335 | static bool rs_is_raid0(struct raid_set *rs) | |
336 | { | |
337 | return !rs->md.level; | |
338 | } | |
339 | ||
9dbd1aa3 HM |
340 | /* Return true, if raid set in @rs is raid1 */ |
341 | static bool rs_is_raid1(struct raid_set *rs) | |
342 | { | |
343 | return rs->md.level == 1; | |
344 | } | |
345 | ||
33e53f06 HM |
346 | /* Return true, if raid set in @rs is raid10 */ |
347 | static bool rs_is_raid10(struct raid_set *rs) | |
348 | { | |
349 | return rs->md.level == 10; | |
350 | } | |
351 | ||
4dff2f1e HM |
352 | /* Return true, if raid set in @rs is level 6 */ |
353 | static bool rs_is_raid6(struct raid_set *rs) | |
354 | { | |
355 | return rs->md.level == 6; | |
356 | } | |
357 | ||
40ba37e5 HM |
358 | /* Return true, if raid set in @rs is level 4, 5 or 6 */ |
359 | static 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 */ | |
d7ccc2e2 | 365 | static bool __is_raid10_far(int layout); |
40ba37e5 HM |
366 | static 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 | ||
9dbd1aa3 HM |
372 | /* Return true, if raid set in @rs is recovering */ |
373 | static bool rs_is_recovering(struct raid_set *rs) | |
374 | { | |
345a6cdc | 375 | return rs->md.recovery_cp < rs->dev[0].rdev.sectors; |
9dbd1aa3 HM |
376 | } |
377 | ||
378 | /* Return true, if raid set in @rs is reshaping */ | |
379 | static bool rs_is_reshaping(struct raid_set *rs) | |
380 | { | |
9dbd1aa3 HM |
381 | return rs->md.reshape_position != MaxSector; |
382 | } | |
383 | ||
f090279e | 384 | /* |
d7ccc2e2 | 385 | * bool helpers to test for various raid levels of a raid type @rt |
f090279e HM |
386 | */ |
387 | ||
388 | /* Return true, if raid type in @rt is raid0 */ | |
389 | static 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 */ | |
395 | static 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 */ | |
401 | static 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 */ | |
407 | static bool rt_is_raid45(struct raid_type *rt) | |
408 | { | |
bb91a63f | 409 | return __within_range(rt->level, 4, 5); |
f090279e HM |
410 | } |
411 | ||
412 | /* Return true, if raid type in @rt is raid6 */ | |
413 | static bool rt_is_raid6(struct raid_type *rt) | |
414 | { | |
415 | return rt->level == 6; | |
416 | } | |
676fa5ad HM |
417 | |
418 | /* Return true, if raid type in @rt is raid4/5/6 */ | |
419 | static bool rt_is_raid456(struct raid_type *rt) | |
420 | { | |
bb91a63f | 421 | return __within_range(rt->level, 4, 6); |
676fa5ad | 422 | } |
f090279e HM |
423 | /* END: raid level bools */ |
424 | ||
a30cbc0d HM |
425 | /* Return valid ctr flags for the raid level of @rs */ |
426 | static unsigned long __valid_flags(struct raid_set *rs) | |
f090279e HM |
427 | { |
428 | if (rt_is_raid0(rs->raid_type)) | |
a30cbc0d | 429 | return RAID0_VALID_FLAGS; |
f090279e | 430 | else if (rt_is_raid1(rs->raid_type)) |
a30cbc0d | 431 | return RAID1_VALID_FLAGS; |
f090279e | 432 | else if (rt_is_raid10(rs->raid_type)) |
a30cbc0d | 433 | return RAID10_VALID_FLAGS; |
f090279e | 434 | else if (rt_is_raid45(rs->raid_type)) |
a30cbc0d | 435 | return RAID45_VALID_FLAGS; |
f090279e | 436 | else if (rt_is_raid6(rs->raid_type)) |
a30cbc0d | 437 | return RAID6_VALID_FLAGS; |
f090279e | 438 | |
d7ccc2e2 | 439 | return 0; |
f090279e HM |
440 | } |
441 | ||
442 | /* | |
a30cbc0d | 443 | * Check for valid flags set on @rs |
f090279e HM |
444 | * |
445 | * Has to be called after parsing of the ctr flags! | |
446 | */ | |
a30cbc0d | 447 | static int rs_check_for_valid_flags(struct raid_set *rs) |
f090279e | 448 | { |
a30cbc0d | 449 | if (rs->ctr_flags & ~__valid_flags(rs)) { |
4286325b | 450 | rs->ti->error = "Invalid flags combination"; |
bd83a4c4 MS |
451 | return -EINVAL; |
452 | } | |
f090279e HM |
453 | |
454 | return 0; | |
455 | } | |
456 | ||
33e53f06 HM |
457 | /* 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 */ | |
e6ca5e1a | 464 | static unsigned int __raid10_near_copies(int layout) |
33e53f06 HM |
465 | { |
466 | return layout & 0xFF; | |
467 | } | |
468 | ||
469 | /* Return md raid10 far copies for @layout */ | |
e6ca5e1a | 470 | static unsigned int __raid10_far_copies(int layout) |
33e53f06 | 471 | { |
e6ca5e1a | 472 | return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT); |
33e53f06 HM |
473 | } |
474 | ||
475 | /* Return true if md raid10 offset for @layout */ | |
d7ccc2e2 | 476 | static bool __is_raid10_offset(int layout) |
33e53f06 | 477 | { |
d7ccc2e2 | 478 | return !!(layout & RAID10_OFFSET); |
33e53f06 HM |
479 | } |
480 | ||
481 | /* Return true if md raid10 near for @layout */ | |
d7ccc2e2 | 482 | static bool __is_raid10_near(int layout) |
33e53f06 | 483 | { |
e6ca5e1a | 484 | return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1; |
33e53f06 HM |
485 | } |
486 | ||
487 | /* Return true if md raid10 far for @layout */ | |
d7ccc2e2 | 488 | static bool __is_raid10_far(int layout) |
33e53f06 | 489 | { |
e6ca5e1a | 490 | return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1; |
33e53f06 HM |
491 | } |
492 | ||
493 | /* Return md raid10 layout string for @layout */ | |
494 | static const char *raid10_md_layout_to_format(int layout) | |
fe5d2f4a JB |
495 | { |
496 | /* | |
33e53f06 HM |
497 | * Bit 16 stands for "offset" |
498 | * (i.e. adjacent stripes hold copies) | |
499 | * | |
fe5d2f4a JB |
500 | * Refer to MD's raid10.c for details |
501 | */ | |
e6ca5e1a | 502 | if (__is_raid10_offset(layout)) |
fe5d2f4a JB |
503 | return "offset"; |
504 | ||
e6ca5e1a | 505 | if (__raid10_near_copies(layout) > 1) |
fe5d2f4a JB |
506 | return "near"; |
507 | ||
e6ca5e1a | 508 | WARN_ON(__raid10_far_copies(layout) < 2); |
33e53f06 | 509 | |
fe5d2f4a JB |
510 | return "far"; |
511 | } | |
512 | ||
33e53f06 | 513 | /* Return md raid10 algorithm for @name */ |
68c1c4d5 | 514 | static int raid10_name_to_format(const char *name) |
33e53f06 HM |
515 | { |
516 | 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; | |
524 | } | |
525 | ||
33e53f06 HM |
526 | /* Return md raid10 copies for @layout */ |
527 | static unsigned int raid10_md_layout_to_copies(int layout) | |
63f33b8d | 528 | { |
d7ccc2e2 | 529 | return max(__raid10_near_copies(layout), __raid10_far_copies(layout)); |
63f33b8d JB |
530 | } |
531 | ||
33e53f06 HM |
532 | /* Return md raid10 format id for @format string */ |
533 | static int raid10_format_to_md_layout(struct raid_set *rs, | |
534 | unsigned int algorithm, | |
535 | unsigned int copies) | |
63f33b8d | 536 | { |
33e53f06 | 537 | unsigned int n = 1, f = 1, r = 0; |
fe5d2f4a | 538 | |
33e53f06 HM |
539 | /* |
540 | * MD resilienece flaw: | |
541 | * | |
542 | * enabling use_far_sets for far/offset formats causes copies | |
543 | * to be colocated on the same devs together with their origins! | |
544 | * | |
545 | * -> disable it for now in the definition above | |
546 | */ | |
547 | if (algorithm == ALGORITHM_RAID10_DEFAULT || | |
548 | algorithm == ALGORITHM_RAID10_NEAR) | |
fe5d2f4a | 549 | n = copies; |
33e53f06 HM |
550 | |
551 | else if (algorithm == ALGORITHM_RAID10_OFFSET) { | |
552 | f = copies; | |
553 | r = RAID10_OFFSET; | |
4286325b | 554 | if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) |
33e53f06 HM |
555 | r |= RAID10_USE_FAR_SETS; |
556 | ||
557 | } else if (algorithm == ALGORITHM_RAID10_FAR) { | |
fe5d2f4a | 558 | f = copies; |
33e53f06 | 559 | r = !RAID10_OFFSET; |
4286325b | 560 | if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) |
33e53f06 | 561 | r |= RAID10_USE_FAR_SETS; |
fe5d2f4a | 562 | |
33e53f06 HM |
563 | } else |
564 | return -EINVAL; | |
565 | ||
566 | return r | (f << RAID10_FAR_COPIES_SHIFT) | n; | |
567 | } | |
568 | /* END: MD raid10 bit definitions and helpers */ | |
fe5d2f4a | 569 | |
33e53f06 | 570 | /* Check for any of the raid10 algorithms */ |
d7ccc2e2 | 571 | static bool __got_raid10(struct raid_type *rtp, const int layout) |
33e53f06 HM |
572 | { |
573 | if (rtp->level == 10) { | |
574 | switch (rtp->algorithm) { | |
575 | case ALGORITHM_RAID10_DEFAULT: | |
576 | case ALGORITHM_RAID10_NEAR: | |
e6ca5e1a | 577 | return __is_raid10_near(layout); |
33e53f06 | 578 | case ALGORITHM_RAID10_OFFSET: |
e6ca5e1a | 579 | return __is_raid10_offset(layout); |
33e53f06 | 580 | case ALGORITHM_RAID10_FAR: |
e6ca5e1a | 581 | return __is_raid10_far(layout); |
33e53f06 HM |
582 | default: |
583 | break; | |
584 | } | |
585 | } | |
fe5d2f4a | 586 | |
d7ccc2e2 | 587 | return false; |
63f33b8d JB |
588 | } |
589 | ||
33e53f06 | 590 | /* Return raid_type for @name */ |
92c83d79 | 591 | static struct raid_type *get_raid_type(const char *name) |
9d09e663 | 592 | { |
33e53f06 | 593 | struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types); |
9d09e663 | 594 | |
33e53f06 HM |
595 | while (rtp-- > raid_types) |
596 | if (!strcasecmp(rtp->name, name)) | |
597 | return rtp; | |
9d09e663 N |
598 | |
599 | return NULL; | |
600 | } | |
601 | ||
33e53f06 HM |
602 | /* Return raid_type for @name based derived from @level and @layout */ |
603 | static struct raid_type *get_raid_type_by_ll(const int level, const int layout) | |
604 | { | |
605 | struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types); | |
606 | ||
607 | while (rtp-- > raid_types) { | |
608 | /* RAID10 special checks based on @layout flags/properties */ | |
609 | if (rtp->level == level && | |
e6ca5e1a | 610 | (__got_raid10(rtp, layout) || rtp->algorithm == layout)) |
33e53f06 HM |
611 | return rtp; |
612 | } | |
613 | ||
614 | return NULL; | |
615 | } | |
616 | ||
9dbd1aa3 HM |
617 | /* |
618 | * Conditionally change bdev capacity of @rs | |
619 | * in case of a disk add/remove reshape | |
620 | */ | |
621 | static void rs_set_capacity(struct raid_set *rs) | |
622 | { | |
623 | struct mddev *mddev = &rs->md; | |
fbe6365b | 624 | struct md_rdev *rdev; |
0095dbc9 | 625 | struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table)); |
9dbd1aa3 | 626 | |
fbe6365b HM |
627 | /* |
628 | * raid10 sets rdev->sector to the device size, which | |
629 | * is unintended in case of out-of-place reshaping | |
630 | */ | |
631 | rdev_for_each(rdev, mddev) | |
632 | rdev->sectors = mddev->dev_sectors; | |
633 | ||
0095dbc9 HM |
634 | set_capacity(gendisk, mddev->array_sectors); |
635 | revalidate_disk(gendisk); | |
9dbd1aa3 HM |
636 | } |
637 | ||
3a1c1ef2 HM |
638 | /* |
639 | * Set the mddev properties in @rs to the current | |
640 | * ones retrieved from the freshest superblock | |
641 | */ | |
642 | static void rs_set_cur(struct raid_set *rs) | |
643 | { | |
644 | struct mddev *mddev = &rs->md; | |
645 | ||
646 | mddev->new_level = mddev->level; | |
647 | mddev->new_layout = mddev->layout; | |
648 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
649 | } | |
650 | ||
33e53f06 HM |
651 | /* |
652 | * Set the mddev properties in @rs to the new | |
653 | * ones requested by the ctr | |
654 | */ | |
655 | static void rs_set_new(struct raid_set *rs) | |
656 | { | |
657 | struct mddev *mddev = &rs->md; | |
658 | ||
659 | mddev->level = mddev->new_level; | |
660 | mddev->layout = mddev->new_layout; | |
661 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3a1c1ef2 | 662 | mddev->raid_disks = rs->raid_disks; |
33e53f06 HM |
663 | mddev->delta_disks = 0; |
664 | } | |
665 | ||
bfcee0e3 | 666 | static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type, |
094f394d | 667 | unsigned int raid_devs) |
9d09e663 | 668 | { |
094f394d | 669 | unsigned int i; |
9d09e663 | 670 | struct raid_set *rs; |
9d09e663 | 671 | |
bd83a4c4 MS |
672 | if (raid_devs <= raid_type->parity_devs) { |
673 | ti->error = "Insufficient number of devices"; | |
674 | return ERR_PTR(-EINVAL); | |
675 | } | |
9d09e663 | 676 | |
9d09e663 | 677 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); |
bd83a4c4 MS |
678 | if (!rs) { |
679 | ti->error = "Cannot allocate raid context"; | |
680 | return ERR_PTR(-ENOMEM); | |
681 | } | |
9d09e663 N |
682 | |
683 | mddev_init(&rs->md); | |
684 | ||
33e53f06 HM |
685 | rs->raid_disks = raid_devs; |
686 | rs->delta_disks = 0; | |
687 | ||
9d09e663 N |
688 | rs->ti = ti; |
689 | rs->raid_type = raid_type; | |
9dbd1aa3 | 690 | rs->stripe_cache_entries = 256; |
9d09e663 N |
691 | rs->md.raid_disks = raid_devs; |
692 | rs->md.level = raid_type->level; | |
693 | rs->md.new_level = rs->md.level; | |
9d09e663 N |
694 | rs->md.layout = raid_type->algorithm; |
695 | rs->md.new_layout = rs->md.layout; | |
696 | rs->md.delta_disks = 0; | |
4dff2f1e | 697 | rs->md.recovery_cp = MaxSector; |
9d09e663 N |
698 | |
699 | for (i = 0; i < raid_devs; i++) | |
700 | md_rdev_init(&rs->dev[i].rdev); | |
701 | ||
702 | /* | |
703 | * Remaining items to be initialized by further RAID params: | |
704 | * rs->md.persistent | |
705 | * rs->md.external | |
706 | * rs->md.chunk_sectors | |
707 | * rs->md.new_chunk_sectors | |
c039c332 | 708 | * rs->md.dev_sectors |
9d09e663 N |
709 | */ |
710 | ||
711 | return rs; | |
712 | } | |
713 | ||
bfcee0e3 | 714 | static void raid_set_free(struct raid_set *rs) |
9d09e663 N |
715 | { |
716 | int i; | |
717 | ||
ffeeac75 | 718 | for (i = 0; i < rs->raid_disks; i++) { |
b12d437b JB |
719 | if (rs->dev[i].meta_dev) |
720 | dm_put_device(rs->ti, rs->dev[i].meta_dev); | |
545c8795 | 721 | md_rdev_clear(&rs->dev[i].rdev); |
9d09e663 N |
722 | if (rs->dev[i].data_dev) |
723 | dm_put_device(rs->ti, rs->dev[i].data_dev); | |
b12d437b | 724 | } |
9d09e663 N |
725 | |
726 | kfree(rs); | |
727 | } | |
728 | ||
729 | /* | |
730 | * For every device we have two words | |
731 | * <meta_dev>: meta device name or '-' if missing | |
732 | * <data_dev>: data device name or '-' if missing | |
733 | * | |
b12d437b JB |
734 | * The following are permitted: |
735 | * - - | |
736 | * - <data_dev> | |
737 | * <meta_dev> <data_dev> | |
738 | * | |
739 | * The following is not allowed: | |
740 | * <meta_dev> - | |
741 | * | |
742 | * This code parses those words. If there is a failure, | |
bfcee0e3 | 743 | * the caller must use raid_set_free() to unwind the operations. |
9d09e663 | 744 | */ |
702108d1 | 745 | static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as) |
9d09e663 N |
746 | { |
747 | int i; | |
748 | int rebuild = 0; | |
749 | int metadata_available = 0; | |
73c6f239 | 750 | int r = 0; |
92c83d79 | 751 | const char *arg; |
9d09e663 | 752 | |
92c83d79 HM |
753 | /* Put off the number of raid devices argument to get to dev pairs */ |
754 | arg = dm_shift_arg(as); | |
755 | if (!arg) | |
756 | return -EINVAL; | |
757 | ||
ffeeac75 | 758 | for (i = 0; i < rs->raid_disks; i++) { |
9d09e663 N |
759 | rs->dev[i].rdev.raid_disk = i; |
760 | ||
761 | rs->dev[i].meta_dev = NULL; | |
762 | rs->dev[i].data_dev = NULL; | |
763 | ||
764 | /* | |
765 | * There are no offsets, since there is a separate device | |
766 | * for data and metadata. | |
767 | */ | |
768 | rs->dev[i].rdev.data_offset = 0; | |
769 | rs->dev[i].rdev.mddev = &rs->md; | |
770 | ||
92c83d79 HM |
771 | arg = dm_shift_arg(as); |
772 | if (!arg) | |
773 | return -EINVAL; | |
774 | ||
775 | if (strcmp(arg, "-")) { | |
bd83a4c4 MS |
776 | r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table), |
777 | &rs->dev[i].meta_dev); | |
778 | if (r) { | |
779 | rs->ti->error = "RAID metadata device lookup failure"; | |
780 | return r; | |
781 | } | |
b12d437b JB |
782 | |
783 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); | |
bd83a4c4 MS |
784 | if (!rs->dev[i].rdev.sb_page) { |
785 | rs->ti->error = "Failed to allocate superblock page"; | |
786 | return -ENOMEM; | |
787 | } | |
9d09e663 N |
788 | } |
789 | ||
92c83d79 HM |
790 | arg = dm_shift_arg(as); |
791 | if (!arg) | |
792 | return -EINVAL; | |
793 | ||
794 | if (!strcmp(arg, "-")) { | |
9d09e663 | 795 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && |
bd83a4c4 MS |
796 | (!rs->dev[i].rdev.recovery_offset)) { |
797 | rs->ti->error = "Drive designated for rebuild not specified"; | |
798 | return -EINVAL; | |
799 | } | |
9d09e663 | 800 | |
bd83a4c4 MS |
801 | if (rs->dev[i].meta_dev) { |
802 | rs->ti->error = "No data device supplied with metadata device"; | |
803 | return -EINVAL; | |
804 | } | |
b12d437b | 805 | |
9d09e663 N |
806 | continue; |
807 | } | |
808 | ||
bd83a4c4 MS |
809 | r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table), |
810 | &rs->dev[i].data_dev); | |
811 | if (r) { | |
812 | rs->ti->error = "RAID device lookup failure"; | |
813 | return r; | |
814 | } | |
9d09e663 | 815 | |
b12d437b JB |
816 | if (rs->dev[i].meta_dev) { |
817 | metadata_available = 1; | |
818 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; | |
819 | } | |
9d09e663 | 820 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
3a1c1ef2 | 821 | list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks); |
9d09e663 N |
822 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) |
823 | rebuild++; | |
824 | } | |
825 | ||
826 | if (metadata_available) { | |
827 | rs->md.external = 0; | |
828 | rs->md.persistent = 1; | |
829 | rs->md.major_version = 2; | |
830 | } else if (rebuild && !rs->md.recovery_cp) { | |
831 | /* | |
832 | * Without metadata, we will not be able to tell if the array | |
833 | * is in-sync or not - we must assume it is not. Therefore, | |
834 | * it is impossible to rebuild a drive. | |
835 | * | |
836 | * Even if there is metadata, the on-disk information may | |
837 | * indicate that the array is not in-sync and it will then | |
838 | * fail at that time. | |
839 | * | |
840 | * User could specify 'nosync' option if desperate. | |
841 | */ | |
bd83a4c4 MS |
842 | rs->ti->error = "Unable to rebuild drive while array is not in-sync"; |
843 | return -EINVAL; | |
9d09e663 N |
844 | } |
845 | ||
846 | return 0; | |
847 | } | |
848 | ||
c1084561 JB |
849 | /* |
850 | * validate_region_size | |
851 | * @rs | |
852 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). | |
853 | * | |
854 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). | |
855 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. | |
856 | * | |
857 | * Returns: 0 on success, -EINVAL on failure. | |
858 | */ | |
859 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) | |
860 | { | |
861 | unsigned long min_region_size = rs->ti->len / (1 << 21); | |
862 | ||
9e7d9367 HM |
863 | if (rs_is_raid0(rs)) |
864 | return 0; | |
865 | ||
c1084561 JB |
866 | if (!region_size) { |
867 | /* | |
43157840 | 868 | * Choose a reasonable default. All figures in sectors. |
c1084561 JB |
869 | */ |
870 | if (min_region_size > (1 << 13)) { | |
3a0f9aae | 871 | /* If not a power of 2, make it the next power of 2 */ |
042745ee | 872 | region_size = roundup_pow_of_two(min_region_size); |
c1084561 JB |
873 | DMINFO("Choosing default region size of %lu sectors", |
874 | region_size); | |
c1084561 JB |
875 | } else { |
876 | DMINFO("Choosing default region size of 4MiB"); | |
877 | region_size = 1 << 13; /* sectors */ | |
878 | } | |
879 | } else { | |
880 | /* | |
881 | * Validate user-supplied value. | |
882 | */ | |
bd83a4c4 MS |
883 | if (region_size > rs->ti->len) { |
884 | rs->ti->error = "Supplied region size is too large"; | |
885 | return -EINVAL; | |
886 | } | |
c1084561 JB |
887 | |
888 | if (region_size < min_region_size) { | |
889 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", | |
890 | region_size, min_region_size); | |
bd83a4c4 MS |
891 | rs->ti->error = "Supplied region size is too small"; |
892 | return -EINVAL; | |
c1084561 JB |
893 | } |
894 | ||
bd83a4c4 MS |
895 | if (!is_power_of_2(region_size)) { |
896 | rs->ti->error = "Region size is not a power of 2"; | |
897 | return -EINVAL; | |
898 | } | |
c1084561 | 899 | |
bd83a4c4 MS |
900 | if (region_size < rs->md.chunk_sectors) { |
901 | rs->ti->error = "Region size is smaller than the chunk size"; | |
902 | return -EINVAL; | |
903 | } | |
c1084561 JB |
904 | } |
905 | ||
906 | /* | |
907 | * Convert sectors to bytes. | |
908 | */ | |
89d3d9a1 | 909 | rs->md.bitmap_info.chunksize = to_bytes(region_size); |
c1084561 JB |
910 | |
911 | return 0; | |
912 | } | |
913 | ||
eb649123 | 914 | /* |
55ebbb59 | 915 | * validate_raid_redundancy |
eb649123 JB |
916 | * @rs |
917 | * | |
55ebbb59 JB |
918 | * Determine if there are enough devices in the array that haven't |
919 | * failed (or are being rebuilt) to form a usable array. | |
eb649123 JB |
920 | * |
921 | * Returns: 0 on success, -EINVAL on failure. | |
922 | */ | |
55ebbb59 | 923 | static int validate_raid_redundancy(struct raid_set *rs) |
eb649123 | 924 | { |
094f394d HM |
925 | unsigned int i, rebuild_cnt = 0; |
926 | unsigned int rebuilds_per_group = 0, copies; | |
927 | unsigned int group_size, last_group_start; | |
eb649123 | 928 | |
eb649123 | 929 | for (i = 0; i < rs->md.raid_disks; i++) |
55ebbb59 JB |
930 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
931 | !rs->dev[i].rdev.sb_page) | |
eb649123 JB |
932 | rebuild_cnt++; |
933 | ||
934 | switch (rs->raid_type->level) { | |
9e7d9367 HM |
935 | case 0: |
936 | break; | |
eb649123 JB |
937 | case 1: |
938 | if (rebuild_cnt >= rs->md.raid_disks) | |
939 | goto too_many; | |
940 | break; | |
941 | case 4: | |
942 | case 5: | |
943 | case 6: | |
944 | if (rebuild_cnt > rs->raid_type->parity_devs) | |
945 | goto too_many; | |
946 | break; | |
947 | case 10: | |
9dbd1aa3 | 948 | copies = raid10_md_layout_to_copies(rs->md.new_layout); |
4ec1e369 JB |
949 | if (rebuild_cnt < copies) |
950 | break; | |
951 | ||
952 | /* | |
953 | * It is possible to have a higher rebuild count for RAID10, | |
954 | * as long as the failed devices occur in different mirror | |
955 | * groups (i.e. different stripes). | |
956 | * | |
4ec1e369 JB |
957 | * When checking "near" format, make sure no adjacent devices |
958 | * have failed beyond what can be handled. In addition to the | |
959 | * simple case where the number of devices is a multiple of the | |
960 | * number of copies, we must also handle cases where the number | |
961 | * of devices is not a multiple of the number of copies. | |
43157840 MS |
962 | * E.g. dev1 dev2 dev3 dev4 dev5 |
963 | * A A B B C | |
964 | * C D D E E | |
4ec1e369 | 965 | */ |
9dbd1aa3 | 966 | if (__is_raid10_near(rs->md.new_layout)) { |
ffeeac75 | 967 | for (i = 0; i < rs->md.raid_disks; i++) { |
fe5d2f4a JB |
968 | if (!(i % copies)) |
969 | rebuilds_per_group = 0; | |
9dbd1aa3 | 970 | if ((!rs->dev[i].rdev.sb_page || |
40ba37e5 | 971 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) && |
fe5d2f4a JB |
972 | (++rebuilds_per_group >= copies)) |
973 | goto too_many; | |
974 | } | |
975 | break; | |
976 | } | |
977 | ||
978 | /* | |
979 | * When checking "far" and "offset" formats, we need to ensure | |
980 | * that the device that holds its copy is not also dead or | |
981 | * being rebuilt. (Note that "far" and "offset" formats only | |
982 | * support two copies right now. These formats also only ever | |
983 | * use the 'use_far_sets' variant.) | |
984 | * | |
985 | * This check is somewhat complicated by the need to account | |
43157840 | 986 | * for arrays that are not a multiple of (far) copies. This |
fe5d2f4a JB |
987 | * results in the need to treat the last (potentially larger) |
988 | * set differently. | |
989 | */ | |
990 | group_size = (rs->md.raid_disks / copies); | |
991 | last_group_start = (rs->md.raid_disks / group_size) - 1; | |
992 | last_group_start *= group_size; | |
993 | for (i = 0; i < rs->md.raid_disks; i++) { | |
994 | if (!(i % copies) && !(i > last_group_start)) | |
55ebbb59 | 995 | rebuilds_per_group = 0; |
fe5d2f4a JB |
996 | if ((!rs->dev[i].rdev.sb_page || |
997 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) && | |
4ec1e369 | 998 | (++rebuilds_per_group >= copies)) |
fe5d2f4a | 999 | goto too_many; |
4ec1e369 JB |
1000 | } |
1001 | break; | |
eb649123 | 1002 | default: |
55ebbb59 JB |
1003 | if (rebuild_cnt) |
1004 | return -EINVAL; | |
eb649123 JB |
1005 | } |
1006 | ||
1007 | return 0; | |
1008 | ||
1009 | too_many: | |
eb649123 JB |
1010 | return -EINVAL; |
1011 | } | |
1012 | ||
9d09e663 N |
1013 | /* |
1014 | * Possible arguments are... | |
9d09e663 N |
1015 | * <chunk_size> [optional_args] |
1016 | * | |
32737279 JB |
1017 | * Argument definitions |
1018 | * <chunk_size> The number of sectors per disk that | |
43157840 | 1019 | * will form the "stripe" |
32737279 | 1020 | * [[no]sync] Force or prevent recovery of the |
43157840 | 1021 | * entire array |
9d09e663 | 1022 | * [rebuild <idx>] Rebuild the drive indicated by the index |
32737279 | 1023 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
43157840 | 1024 | * clear bits |
9d09e663 N |
1025 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
1026 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization | |
46bed2b5 | 1027 | * [write_mostly <idx>] Indicate a write mostly drive via index |
9d09e663 N |
1028 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
1029 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs | |
43157840 | 1030 | * [region_size <sectors>] Defines granularity of bitmap |
63f33b8d JB |
1031 | * |
1032 | * RAID10-only options: | |
43157840 | 1033 | * [raid10_copies <# copies>] Number of copies. (Default: 2) |
fe5d2f4a | 1034 | * [raid10_format <near|far|offset>] Layout algorithm. (Default: near) |
9d09e663 | 1035 | */ |
92c83d79 | 1036 | static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as, |
094f394d | 1037 | unsigned int num_raid_params) |
9d09e663 | 1038 | { |
9dbd1aa3 | 1039 | int value, raid10_format = ALGORITHM_RAID10_DEFAULT; |
094f394d HM |
1040 | unsigned int raid10_copies = 2; |
1041 | unsigned int i, write_mostly = 0; | |
1042 | unsigned int region_size = 0; | |
542f9038 | 1043 | sector_t max_io_len; |
92c83d79 | 1044 | const char *arg, *key; |
702108d1 | 1045 | struct raid_dev *rd; |
33e53f06 | 1046 | struct raid_type *rt = rs->raid_type; |
92c83d79 HM |
1047 | |
1048 | arg = dm_shift_arg(as); | |
1049 | num_raid_params--; /* Account for chunk_size argument */ | |
1050 | ||
9dbd1aa3 | 1051 | if (kstrtoint(arg, 10, &value) < 0) { |
bd83a4c4 MS |
1052 | rs->ti->error = "Bad numerical argument given for chunk_size"; |
1053 | return -EINVAL; | |
1054 | } | |
9d09e663 N |
1055 | |
1056 | /* | |
1057 | * First, parse the in-order required arguments | |
32737279 | 1058 | * "chunk_size" is the only argument of this type. |
9d09e663 | 1059 | */ |
33e53f06 | 1060 | if (rt_is_raid1(rt)) { |
32737279 JB |
1061 | if (value) |
1062 | DMERR("Ignoring chunk size parameter for RAID 1"); | |
1063 | value = 0; | |
bd83a4c4 MS |
1064 | } else if (!is_power_of_2(value)) { |
1065 | rs->ti->error = "Chunk size must be a power of 2"; | |
1066 | return -EINVAL; | |
1067 | } else if (value < 8) { | |
1068 | rs->ti->error = "Chunk size value is too small"; | |
1069 | return -EINVAL; | |
1070 | } | |
9d09e663 N |
1071 | |
1072 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; | |
9d09e663 N |
1073 | |
1074 | /* | |
b12d437b JB |
1075 | * We set each individual device as In_sync with a completed |
1076 | * 'recovery_offset'. If there has been a device failure or | |
1077 | * replacement then one of the following cases applies: | |
1078 | * | |
1079 | * 1) User specifies 'rebuild'. | |
43157840 | 1080 | * - Device is reset when param is read. |
b12d437b | 1081 | * 2) A new device is supplied. |
43157840 | 1082 | * - No matching superblock found, resets device. |
b12d437b | 1083 | * 3) Device failure was transient and returns on reload. |
43157840 | 1084 | * - Failure noticed, resets device for bitmap replay. |
b12d437b | 1085 | * 4) Device hadn't completed recovery after previous failure. |
43157840 | 1086 | * - Superblock is read and overrides recovery_offset. |
b12d437b JB |
1087 | * |
1088 | * What is found in the superblocks of the devices is always | |
1089 | * authoritative, unless 'rebuild' or '[no]sync' was specified. | |
9d09e663 | 1090 | */ |
ffeeac75 | 1091 | for (i = 0; i < rs->raid_disks; i++) { |
9d09e663 | 1092 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
b12d437b JB |
1093 | rs->dev[i].rdev.recovery_offset = MaxSector; |
1094 | } | |
9d09e663 | 1095 | |
b12d437b JB |
1096 | /* |
1097 | * Second, parse the unordered optional arguments | |
1098 | */ | |
9d09e663 | 1099 | for (i = 0; i < num_raid_params; i++) { |
4763e543 | 1100 | key = dm_shift_arg(as); |
bd83a4c4 MS |
1101 | if (!key) { |
1102 | rs->ti->error = "Not enough raid parameters given"; | |
1103 | return -EINVAL; | |
1104 | } | |
92c83d79 | 1105 | |
3fa6cf38 | 1106 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) { |
4286325b | 1107 | if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) { |
bd83a4c4 MS |
1108 | rs->ti->error = "Only one 'nosync' argument allowed"; |
1109 | return -EINVAL; | |
1110 | } | |
9d09e663 N |
1111 | continue; |
1112 | } | |
3fa6cf38 | 1113 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) { |
4286325b | 1114 | if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) { |
bd83a4c4 MS |
1115 | rs->ti->error = "Only one 'sync' argument allowed"; |
1116 | return -EINVAL; | |
1117 | } | |
4763e543 HM |
1118 | continue; |
1119 | } | |
3fa6cf38 | 1120 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) { |
4286325b | 1121 | if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) { |
bd83a4c4 MS |
1122 | rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed"; |
1123 | return -EINVAL; | |
1124 | } | |
9d09e663 N |
1125 | continue; |
1126 | } | |
1127 | ||
92c83d79 HM |
1128 | arg = dm_shift_arg(as); |
1129 | i++; /* Account for the argument pairs */ | |
bd83a4c4 MS |
1130 | if (!arg) { |
1131 | rs->ti->error = "Wrong number of raid parameters given"; | |
1132 | return -EINVAL; | |
1133 | } | |
63f33b8d | 1134 | |
702108d1 HM |
1135 | /* |
1136 | * Parameters that take a string value are checked here. | |
1137 | */ | |
1138 | ||
3fa6cf38 | 1139 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) { |
4286325b | 1140 | if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) { |
bd83a4c4 MS |
1141 | rs->ti->error = "Only one 'raid10_format' argument pair allowed"; |
1142 | return -EINVAL; | |
1143 | } | |
1144 | if (!rt_is_raid10(rt)) { | |
1145 | rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type"; | |
1146 | return -EINVAL; | |
1147 | } | |
33e53f06 | 1148 | raid10_format = raid10_name_to_format(arg); |
bd83a4c4 MS |
1149 | if (raid10_format < 0) { |
1150 | rs->ti->error = "Invalid 'raid10_format' value given"; | |
1151 | return raid10_format; | |
1152 | } | |
63f33b8d JB |
1153 | continue; |
1154 | } | |
1155 | ||
9dbd1aa3 | 1156 | if (kstrtoint(arg, 10, &value) < 0) { |
bd83a4c4 MS |
1157 | rs->ti->error = "Bad numerical argument given in raid params"; |
1158 | return -EINVAL; | |
1159 | } | |
702108d1 | 1160 | |
3fa6cf38 | 1161 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) { |
702108d1 HM |
1162 | /* |
1163 | * "rebuild" is being passed in by userspace to provide | |
1164 | * indexes of replaced devices and to set up additional | |
1165 | * devices on raid level takeover. | |
43157840 | 1166 | */ |
bb91a63f | 1167 | if (!__within_range(value, 0, rs->raid_disks - 1)) { |
bd83a4c4 MS |
1168 | rs->ti->error = "Invalid rebuild index given"; |
1169 | return -EINVAL; | |
1170 | } | |
702108d1 | 1171 | |
bd83a4c4 MS |
1172 | if (test_and_set_bit(value, (void *) rs->rebuild_disks)) { |
1173 | rs->ti->error = "rebuild for this index already given"; | |
1174 | return -EINVAL; | |
1175 | } | |
ecbfb9f1 | 1176 | |
702108d1 HM |
1177 | rd = rs->dev + value; |
1178 | clear_bit(In_sync, &rd->rdev.flags); | |
1179 | clear_bit(Faulty, &rd->rdev.flags); | |
1180 | rd->rdev.recovery_offset = 0; | |
4286325b | 1181 | set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags); |
3fa6cf38 | 1182 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) { |
bd83a4c4 MS |
1183 | if (!rt_is_raid1(rt)) { |
1184 | rs->ti->error = "write_mostly option is only valid for RAID1"; | |
1185 | return -EINVAL; | |
1186 | } | |
702108d1 | 1187 | |
bb91a63f | 1188 | if (!__within_range(value, 0, rs->md.raid_disks - 1)) { |
bd83a4c4 MS |
1189 | rs->ti->error = "Invalid write_mostly index given"; |
1190 | return -EINVAL; | |
1191 | } | |
9d09e663 | 1192 | |
5fa146b2 | 1193 | write_mostly++; |
46bed2b5 | 1194 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); |
4286325b | 1195 | set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags); |
3fa6cf38 | 1196 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) { |
bd83a4c4 MS |
1197 | if (!rt_is_raid1(rt)) { |
1198 | rs->ti->error = "max_write_behind option is only valid for RAID1"; | |
1199 | return -EINVAL; | |
1200 | } | |
702108d1 | 1201 | |
4286325b | 1202 | if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) { |
bd83a4c4 MS |
1203 | rs->ti->error = "Only one max_write_behind argument pair allowed"; |
1204 | return -EINVAL; | |
1205 | } | |
9d09e663 N |
1206 | |
1207 | /* | |
1208 | * In device-mapper, we specify things in sectors, but | |
1209 | * MD records this value in kB | |
1210 | */ | |
1211 | value /= 2; | |
bd83a4c4 MS |
1212 | if (value > COUNTER_MAX) { |
1213 | rs->ti->error = "Max write-behind limit out of range"; | |
1214 | return -EINVAL; | |
1215 | } | |
702108d1 | 1216 | |
9d09e663 | 1217 | rs->md.bitmap_info.max_write_behind = value; |
3fa6cf38 | 1218 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) { |
4286325b | 1219 | if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) { |
bd83a4c4 MS |
1220 | rs->ti->error = "Only one daemon_sleep argument pair allowed"; |
1221 | return -EINVAL; | |
1222 | } | |
1223 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { | |
1224 | rs->ti->error = "daemon sleep period out of range"; | |
1225 | return -EINVAL; | |
1226 | } | |
9d09e663 | 1227 | rs->md.bitmap_info.daemon_sleep = value; |
3fa6cf38 | 1228 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) { |
4763e543 | 1229 | /* Userspace passes new data_offset after having extended the the data image LV */ |
4286325b | 1230 | if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) { |
bd83a4c4 MS |
1231 | rs->ti->error = "Only one data_offset argument pair allowed"; |
1232 | return -EINVAL; | |
1233 | } | |
4763e543 | 1234 | /* Ensure sensible data offset */ |
75dd3b9e HM |
1235 | if (value < 0 || |
1236 | (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) { | |
bd83a4c4 MS |
1237 | rs->ti->error = "Bogus data_offset value"; |
1238 | return -EINVAL; | |
1239 | } | |
4763e543 | 1240 | rs->data_offset = value; |
3fa6cf38 | 1241 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) { |
4763e543 | 1242 | /* Define the +/-# of disks to add to/remove from the given raid set */ |
4286325b | 1243 | if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) { |
bd83a4c4 MS |
1244 | rs->ti->error = "Only one delta_disks argument pair allowed"; |
1245 | return -EINVAL; | |
1246 | } | |
4763e543 | 1247 | /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */ |
bb91a63f | 1248 | if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) { |
bd83a4c4 MS |
1249 | rs->ti->error = "Too many delta_disk requested"; |
1250 | return -EINVAL; | |
1251 | } | |
4763e543 HM |
1252 | |
1253 | rs->delta_disks = value; | |
3fa6cf38 | 1254 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) { |
4286325b | 1255 | if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) { |
bd83a4c4 MS |
1256 | rs->ti->error = "Only one stripe_cache argument pair allowed"; |
1257 | return -EINVAL; | |
1258 | } | |
1259 | ||
bd83a4c4 MS |
1260 | if (!rt_is_raid456(rt)) { |
1261 | rs->ti->error = "Inappropriate argument: stripe_cache"; | |
1262 | return -EINVAL; | |
1263 | } | |
702108d1 | 1264 | |
9dbd1aa3 | 1265 | rs->stripe_cache_entries = value; |
3fa6cf38 | 1266 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) { |
4286325b | 1267 | if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) { |
bd83a4c4 MS |
1268 | rs->ti->error = "Only one min_recovery_rate argument pair allowed"; |
1269 | return -EINVAL; | |
1270 | } | |
1271 | if (value > INT_MAX) { | |
1272 | rs->ti->error = "min_recovery_rate out of range"; | |
1273 | return -EINVAL; | |
1274 | } | |
9d09e663 | 1275 | rs->md.sync_speed_min = (int)value; |
3fa6cf38 | 1276 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) { |
f15f64d6 | 1277 | if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) { |
bd83a4c4 MS |
1278 | rs->ti->error = "Only one max_recovery_rate argument pair allowed"; |
1279 | return -EINVAL; | |
1280 | } | |
1281 | if (value > INT_MAX) { | |
1282 | rs->ti->error = "max_recovery_rate out of range"; | |
1283 | return -EINVAL; | |
1284 | } | |
9d09e663 | 1285 | rs->md.sync_speed_max = (int)value; |
3fa6cf38 | 1286 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) { |
4286325b | 1287 | if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) { |
bd83a4c4 MS |
1288 | rs->ti->error = "Only one region_size argument pair allowed"; |
1289 | return -EINVAL; | |
1290 | } | |
702108d1 | 1291 | |
c1084561 | 1292 | region_size = value; |
4257e085 | 1293 | rs->requested_bitmap_chunk_sectors = value; |
3fa6cf38 | 1294 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) { |
4286325b | 1295 | if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) { |
bd83a4c4 MS |
1296 | rs->ti->error = "Only one raid10_copies argument pair allowed"; |
1297 | return -EINVAL; | |
1298 | } | |
702108d1 | 1299 | |
bb91a63f | 1300 | if (!__within_range(value, 2, rs->md.raid_disks)) { |
bd83a4c4 MS |
1301 | rs->ti->error = "Bad value for 'raid10_copies'"; |
1302 | return -EINVAL; | |
1303 | } | |
702108d1 | 1304 | |
63f33b8d | 1305 | raid10_copies = value; |
9d09e663 N |
1306 | } else { |
1307 | DMERR("Unable to parse RAID parameter: %s", key); | |
bd83a4c4 MS |
1308 | rs->ti->error = "Unable to parse RAID parameter"; |
1309 | return -EINVAL; | |
9d09e663 N |
1310 | } |
1311 | } | |
1312 | ||
0d851d14 HM |
1313 | if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) && |
1314 | test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) { | |
1315 | rs->ti->error = "sync and nosync are mutually exclusive"; | |
1316 | return -EINVAL; | |
1317 | } | |
1318 | ||
37f10be1 HM |
1319 | if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags) && |
1320 | (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) || | |
1321 | test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))) { | |
1322 | rs->ti->error = "sync/nosync and rebuild are mutually exclusive"; | |
1323 | return -EINVAL; | |
1324 | } | |
1325 | ||
5fa146b2 HM |
1326 | if (write_mostly >= rs->md.raid_disks) { |
1327 | rs->ti->error = "Can't set all raid1 devices to write_mostly"; | |
1328 | return -EINVAL; | |
1329 | } | |
1330 | ||
c1084561 JB |
1331 | if (validate_region_size(rs, region_size)) |
1332 | return -EINVAL; | |
1333 | ||
1334 | if (rs->md.chunk_sectors) | |
542f9038 | 1335 | max_io_len = rs->md.chunk_sectors; |
c1084561 | 1336 | else |
542f9038 | 1337 | max_io_len = region_size; |
c1084561 | 1338 | |
542f9038 MS |
1339 | if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
1340 | return -EINVAL; | |
32737279 | 1341 | |
33e53f06 | 1342 | if (rt_is_raid10(rt)) { |
bd83a4c4 MS |
1343 | if (raid10_copies > rs->md.raid_disks) { |
1344 | rs->ti->error = "Not enough devices to satisfy specification"; | |
1345 | return -EINVAL; | |
1346 | } | |
63f33b8d | 1347 | |
33e53f06 | 1348 | rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies); |
bd83a4c4 MS |
1349 | if (rs->md.new_layout < 0) { |
1350 | rs->ti->error = "Error getting raid10 format"; | |
1351 | return rs->md.new_layout; | |
1352 | } | |
33e53f06 HM |
1353 | |
1354 | rt = get_raid_type_by_ll(10, rs->md.new_layout); | |
bd83a4c4 MS |
1355 | if (!rt) { |
1356 | rs->ti->error = "Failed to recognize new raid10 layout"; | |
1357 | return -EINVAL; | |
1358 | } | |
33e53f06 HM |
1359 | |
1360 | if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT || | |
1361 | rt->algorithm == ALGORITHM_RAID10_NEAR) && | |
4286325b | 1362 | test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) { |
bd83a4c4 MS |
1363 | rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible"; |
1364 | return -EINVAL; | |
1365 | } | |
bd83a4c4 | 1366 | } |
702108d1 | 1367 | |
33e53f06 | 1368 | rs->raid10_copies = raid10_copies; |
c039c332 | 1369 | |
9d09e663 N |
1370 | /* Assume there are no metadata devices until the drives are parsed */ |
1371 | rs->md.persistent = 0; | |
1372 | rs->md.external = 1; | |
1373 | ||
f090279e | 1374 | /* Check, if any invalid ctr arguments have been passed in for the raid level */ |
a30cbc0d | 1375 | return rs_check_for_valid_flags(rs); |
9d09e663 N |
1376 | } |
1377 | ||
9dbd1aa3 HM |
1378 | /* Set raid4/5/6 cache size */ |
1379 | static int rs_set_raid456_stripe_cache(struct raid_set *rs) | |
1380 | { | |
1381 | int r; | |
1382 | struct r5conf *conf; | |
1383 | struct mddev *mddev = &rs->md; | |
1384 | uint32_t min_stripes = max(mddev->chunk_sectors, mddev->new_chunk_sectors) / 2; | |
1385 | uint32_t nr_stripes = rs->stripe_cache_entries; | |
1386 | ||
1387 | if (!rt_is_raid456(rs->raid_type)) { | |
1388 | rs->ti->error = "Inappropriate raid level; cannot change stripe_cache size"; | |
1389 | return -EINVAL; | |
1390 | } | |
1391 | ||
1392 | if (nr_stripes < min_stripes) { | |
1393 | DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size", | |
1394 | nr_stripes, min_stripes); | |
1395 | nr_stripes = min_stripes; | |
1396 | } | |
1397 | ||
1398 | conf = mddev->private; | |
1399 | if (!conf) { | |
1400 | rs->ti->error = "Cannot change stripe_cache size on inactive RAID set"; | |
1401 | return -EINVAL; | |
1402 | } | |
1403 | ||
1404 | /* Try setting number of stripes in raid456 stripe cache */ | |
1405 | if (conf->min_nr_stripes != nr_stripes) { | |
1406 | r = raid5_set_cache_size(mddev, nr_stripes); | |
1407 | if (r) { | |
1408 | rs->ti->error = "Failed to set raid4/5/6 stripe cache size"; | |
1409 | return r; | |
1410 | } | |
1411 | ||
1412 | DMINFO("%u stripe cache entries", nr_stripes); | |
1413 | } | |
1414 | ||
1415 | return 0; | |
1416 | } | |
1417 | ||
3a1c1ef2 HM |
1418 | /* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */ |
1419 | static unsigned int mddev_data_stripes(struct raid_set *rs) | |
1420 | { | |
1421 | return rs->md.raid_disks - rs->raid_type->parity_devs; | |
1422 | } | |
1423 | ||
40ba37e5 HM |
1424 | /* Return # of data stripes of @rs (i.e. as of ctr) */ |
1425 | static unsigned int rs_data_stripes(struct raid_set *rs) | |
1426 | { | |
1427 | return rs->raid_disks - rs->raid_type->parity_devs; | |
1428 | } | |
1429 | ||
1430 | /* Calculate the sectors per device and per array used for @rs */ | |
1431 | static int rs_set_dev_and_array_sectors(struct raid_set *rs, bool use_mddev) | |
1432 | { | |
1433 | int delta_disks; | |
1434 | unsigned int data_stripes; | |
1435 | struct mddev *mddev = &rs->md; | |
1436 | struct md_rdev *rdev; | |
1437 | sector_t array_sectors = rs->ti->len, dev_sectors = rs->ti->len; | |
1438 | ||
1439 | if (use_mddev) { | |
1440 | delta_disks = mddev->delta_disks; | |
1441 | data_stripes = mddev_data_stripes(rs); | |
1442 | } else { | |
1443 | delta_disks = rs->delta_disks; | |
1444 | data_stripes = rs_data_stripes(rs); | |
1445 | } | |
1446 | ||
1447 | /* Special raid1 case w/o delta_disks support (yet) */ | |
1448 | if (rt_is_raid1(rs->raid_type)) | |
1449 | ; | |
1450 | else if (rt_is_raid10(rs->raid_type)) { | |
1451 | if (rs->raid10_copies < 2 || | |
1452 | delta_disks < 0) { | |
1453 | rs->ti->error = "Bogus raid10 data copies or delta disks"; | |
094f394d | 1454 | return -EINVAL; |
40ba37e5 HM |
1455 | } |
1456 | ||
1457 | dev_sectors *= rs->raid10_copies; | |
1458 | if (sector_div(dev_sectors, data_stripes)) | |
1459 | goto bad; | |
1460 | ||
1461 | array_sectors = (data_stripes + delta_disks) * dev_sectors; | |
1462 | if (sector_div(array_sectors, rs->raid10_copies)) | |
1463 | goto bad; | |
1464 | ||
1465 | } else if (sector_div(dev_sectors, data_stripes)) | |
1466 | goto bad; | |
1467 | ||
1468 | else | |
1469 | /* Striped layouts */ | |
1470 | array_sectors = (data_stripes + delta_disks) * dev_sectors; | |
1471 | ||
1472 | rdev_for_each(rdev, mddev) | |
1473 | rdev->sectors = dev_sectors; | |
1474 | ||
1475 | mddev->array_sectors = array_sectors; | |
1476 | mddev->dev_sectors = dev_sectors; | |
1477 | ||
1478 | return 0; | |
1479 | bad: | |
1480 | rs->ti->error = "Target length not divisible by number of data devices"; | |
094f394d | 1481 | return -EINVAL; |
40ba37e5 HM |
1482 | } |
1483 | ||
4dff2f1e HM |
1484 | /* Setup recovery on @rs */ |
1485 | static void __rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors) | |
1486 | { | |
1487 | /* raid0 does not recover */ | |
1488 | if (rs_is_raid0(rs)) | |
1489 | rs->md.recovery_cp = MaxSector; | |
1490 | /* | |
1491 | * A raid6 set has to be recovered either | |
1492 | * completely or for the grown part to | |
1493 | * ensure proper parity and Q-Syndrome | |
1494 | */ | |
1495 | else if (rs_is_raid6(rs)) | |
1496 | rs->md.recovery_cp = dev_sectors; | |
1497 | /* | |
1498 | * Other raid set types may skip recovery | |
1499 | * depending on the 'nosync' flag. | |
1500 | */ | |
1501 | else | |
1502 | rs->md.recovery_cp = test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags) | |
1503 | ? MaxSector : dev_sectors; | |
1504 | } | |
1505 | ||
1506 | /* Setup recovery on @rs based on raid type, device size and 'nosync' flag */ | |
1507 | static void rs_setup_recovery(struct raid_set *rs, sector_t dev_sectors) | |
1508 | { | |
1509 | if (!dev_sectors) | |
1510 | /* New raid set or 'sync' flag provided */ | |
1511 | __rs_setup_recovery(rs, 0); | |
1512 | else if (dev_sectors == MaxSector) | |
1513 | /* Prevent recovery */ | |
1514 | __rs_setup_recovery(rs, MaxSector); | |
1515 | else if (rs->dev[0].rdev.sectors < dev_sectors) | |
1516 | /* Grown raid set */ | |
1517 | __rs_setup_recovery(rs, rs->dev[0].rdev.sectors); | |
1518 | else | |
1519 | __rs_setup_recovery(rs, MaxSector); | |
1520 | } | |
1521 | ||
9d09e663 N |
1522 | static void do_table_event(struct work_struct *ws) |
1523 | { | |
1524 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); | |
1525 | ||
9d9d939c HM |
1526 | smp_rmb(); /* Make sure we access most actual mddev properties */ |
1527 | if (!rs_is_reshaping(rs)) | |
1528 | rs_set_capacity(rs); | |
9d09e663 N |
1529 | dm_table_event(rs->ti->table); |
1530 | } | |
1531 | ||
1532 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) | |
1533 | { | |
1534 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); | |
1535 | ||
5c675f83 | 1536 | return mddev_congested(&rs->md, bits); |
9d09e663 N |
1537 | } |
1538 | ||
ecbfb9f1 HM |
1539 | /* |
1540 | * Make sure a valid takover (level switch) is being requested on @rs | |
1541 | * | |
1542 | * Conversions of raid sets from one MD personality to another | |
1543 | * have to conform to restrictions which are enforced here. | |
ecbfb9f1 HM |
1544 | */ |
1545 | static int rs_check_takeover(struct raid_set *rs) | |
1546 | { | |
1547 | struct mddev *mddev = &rs->md; | |
1548 | unsigned int near_copies; | |
1549 | ||
9dbd1aa3 HM |
1550 | if (rs->md.degraded) { |
1551 | rs->ti->error = "Can't takeover degraded raid set"; | |
1552 | return -EPERM; | |
1553 | } | |
1554 | ||
1555 | if (rs_is_reshaping(rs)) { | |
1556 | rs->ti->error = "Can't takeover reshaping raid set"; | |
1557 | return -EPERM; | |
1558 | } | |
1559 | ||
ecbfb9f1 HM |
1560 | switch (mddev->level) { |
1561 | case 0: | |
1562 | /* raid0 -> raid1/5 with one disk */ | |
1563 | if ((mddev->new_level == 1 || mddev->new_level == 5) && | |
1564 | mddev->raid_disks == 1) | |
1565 | return 0; | |
1566 | ||
1567 | /* raid0 -> raid10 */ | |
1568 | if (mddev->new_level == 10 && | |
9dbd1aa3 | 1569 | !(rs->raid_disks % mddev->raid_disks)) |
ecbfb9f1 HM |
1570 | return 0; |
1571 | ||
1572 | /* raid0 with multiple disks -> raid4/5/6 */ | |
bb91a63f | 1573 | if (__within_range(mddev->new_level, 4, 6) && |
ecbfb9f1 HM |
1574 | mddev->new_layout == ALGORITHM_PARITY_N && |
1575 | mddev->raid_disks > 1) | |
1576 | return 0; | |
1577 | ||
1578 | break; | |
1579 | ||
1580 | case 10: | |
1581 | /* Can't takeover raid10_offset! */ | |
e6ca5e1a | 1582 | if (__is_raid10_offset(mddev->layout)) |
ecbfb9f1 HM |
1583 | break; |
1584 | ||
e6ca5e1a | 1585 | near_copies = __raid10_near_copies(mddev->layout); |
ecbfb9f1 HM |
1586 | |
1587 | /* raid10* -> raid0 */ | |
1588 | if (mddev->new_level == 0) { | |
1589 | /* Can takeover raid10_near with raid disks divisable by data copies! */ | |
1590 | if (near_copies > 1 && | |
1591 | !(mddev->raid_disks % near_copies)) { | |
1592 | mddev->raid_disks /= near_copies; | |
1593 | mddev->delta_disks = mddev->raid_disks; | |
1594 | return 0; | |
1595 | } | |
1596 | ||
1597 | /* Can takeover raid10_far */ | |
1598 | if (near_copies == 1 && | |
e6ca5e1a | 1599 | __raid10_far_copies(mddev->layout) > 1) |
ecbfb9f1 HM |
1600 | return 0; |
1601 | ||
1602 | break; | |
1603 | } | |
1604 | ||
1605 | /* raid10_{near,far} -> raid1 */ | |
1606 | if (mddev->new_level == 1 && | |
e6ca5e1a | 1607 | max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks) |
ecbfb9f1 HM |
1608 | return 0; |
1609 | ||
1610 | /* raid10_{near,far} with 2 disks -> raid4/5 */ | |
bb91a63f | 1611 | if (__within_range(mddev->new_level, 4, 5) && |
ecbfb9f1 HM |
1612 | mddev->raid_disks == 2) |
1613 | return 0; | |
1614 | break; | |
1615 | ||
1616 | case 1: | |
1617 | /* raid1 with 2 disks -> raid4/5 */ | |
bb91a63f | 1618 | if (__within_range(mddev->new_level, 4, 5) && |
ecbfb9f1 HM |
1619 | mddev->raid_disks == 2) { |
1620 | mddev->degraded = 1; | |
1621 | return 0; | |
1622 | } | |
1623 | ||
1624 | /* raid1 -> raid0 */ | |
1625 | if (mddev->new_level == 0 && | |
1626 | mddev->raid_disks == 1) | |
1627 | return 0; | |
1628 | ||
1629 | /* raid1 -> raid10 */ | |
1630 | if (mddev->new_level == 10) | |
1631 | return 0; | |
ecbfb9f1 HM |
1632 | break; |
1633 | ||
1634 | case 4: | |
1635 | /* raid4 -> raid0 */ | |
1636 | if (mddev->new_level == 0) | |
1637 | return 0; | |
1638 | ||
1639 | /* raid4 -> raid1/5 with 2 disks */ | |
1640 | if ((mddev->new_level == 1 || mddev->new_level == 5) && | |
1641 | mddev->raid_disks == 2) | |
1642 | return 0; | |
1643 | ||
1644 | /* raid4 -> raid5/6 with parity N */ | |
bb91a63f | 1645 | if (__within_range(mddev->new_level, 5, 6) && |
ecbfb9f1 HM |
1646 | mddev->layout == ALGORITHM_PARITY_N) |
1647 | return 0; | |
1648 | break; | |
1649 | ||
1650 | case 5: | |
1651 | /* raid5 with parity N -> raid0 */ | |
1652 | if (mddev->new_level == 0 && | |
1653 | mddev->layout == ALGORITHM_PARITY_N) | |
1654 | return 0; | |
1655 | ||
1656 | /* raid5 with parity N -> raid4 */ | |
1657 | if (mddev->new_level == 4 && | |
1658 | mddev->layout == ALGORITHM_PARITY_N) | |
1659 | return 0; | |
1660 | ||
1661 | /* raid5 with 2 disks -> raid1/4/10 */ | |
1662 | if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) && | |
1663 | mddev->raid_disks == 2) | |
1664 | return 0; | |
1665 | ||
6ee0bae9 | 1666 | /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */ |
ecbfb9f1 HM |
1667 | if (mddev->new_level == 6 && |
1668 | ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) || | |
bb91a63f | 1669 | __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6))) |
ecbfb9f1 HM |
1670 | return 0; |
1671 | break; | |
1672 | ||
1673 | case 6: | |
1674 | /* raid6 with parity N -> raid0 */ | |
1675 | if (mddev->new_level == 0 && | |
1676 | mddev->layout == ALGORITHM_PARITY_N) | |
1677 | return 0; | |
1678 | ||
1679 | /* raid6 with parity N -> raid4 */ | |
1680 | if (mddev->new_level == 4 && | |
1681 | mddev->layout == ALGORITHM_PARITY_N) | |
1682 | return 0; | |
1683 | ||
6ee0bae9 | 1684 | /* raid6_*_n with Q-Syndrome N -> raid5_* */ |
ecbfb9f1 HM |
1685 | if (mddev->new_level == 5 && |
1686 | ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) || | |
bb91a63f | 1687 | __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC))) |
ecbfb9f1 HM |
1688 | return 0; |
1689 | ||
1690 | default: | |
1691 | break; | |
1692 | } | |
1693 | ||
bd83a4c4 MS |
1694 | rs->ti->error = "takeover not possible"; |
1695 | return -EINVAL; | |
ecbfb9f1 HM |
1696 | } |
1697 | ||
1698 | /* True if @rs requested to be taken over */ | |
1699 | static bool rs_takeover_requested(struct raid_set *rs) | |
1700 | { | |
1701 | return rs->md.new_level != rs->md.level; | |
1702 | } | |
1703 | ||
40ba37e5 HM |
1704 | /* True if @rs is requested to reshape by ctr */ |
1705 | static bool rs_reshape_requested(struct raid_set *rs) | |
1706 | { | |
469b304b | 1707 | bool change; |
40ba37e5 HM |
1708 | struct mddev *mddev = &rs->md; |
1709 | ||
469b304b HM |
1710 | if (rs_takeover_requested(rs)) |
1711 | return false; | |
1712 | ||
40ba37e5 HM |
1713 | if (!mddev->level) |
1714 | return false; | |
1715 | ||
469b304b HM |
1716 | change = mddev->new_layout != mddev->layout || |
1717 | mddev->new_chunk_sectors != mddev->chunk_sectors || | |
1718 | rs->delta_disks; | |
1719 | ||
1720 | /* Historical case to support raid1 reshape without delta disks */ | |
7a7c330f HM |
1721 | if (mddev->level == 1) { |
1722 | if (rs->delta_disks) | |
1723 | return !!rs->delta_disks; | |
1724 | ||
469b304b HM |
1725 | return !change && |
1726 | mddev->raid_disks != rs->raid_disks; | |
7a7c330f | 1727 | } |
469b304b HM |
1728 | |
1729 | if (mddev->level == 10) | |
1730 | return change && | |
1731 | !__is_raid10_far(mddev->new_layout) && | |
1732 | rs->delta_disks >= 0; | |
1733 | ||
1734 | return change; | |
40ba37e5 HM |
1735 | } |
1736 | ||
33e53f06 | 1737 | /* Features */ |
9b6e5423 | 1738 | #define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */ |
33e53f06 HM |
1739 | |
1740 | /* State flags for sb->flags */ | |
1741 | #define SB_FLAG_RESHAPE_ACTIVE 0x1 | |
1742 | #define SB_FLAG_RESHAPE_BACKWARDS 0x2 | |
1743 | ||
b12d437b JB |
1744 | /* |
1745 | * This structure is never routinely used by userspace, unlike md superblocks. | |
1746 | * Devices with this superblock should only ever be accessed via device-mapper. | |
1747 | */ | |
1748 | #define DM_RAID_MAGIC 0x64526D44 | |
1749 | struct dm_raid_superblock { | |
1750 | __le32 magic; /* "DmRd" */ | |
9b6e5423 | 1751 | __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */ |
b12d437b | 1752 | |
33e53f06 HM |
1753 | __le32 num_devices; /* Number of devices in this raid set. (Max 64) */ |
1754 | __le32 array_position; /* The position of this drive in the raid set */ | |
b12d437b JB |
1755 | |
1756 | __le64 events; /* Incremented by md when superblock updated */ | |
9b6e5423 | 1757 | __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */ |
33e53f06 | 1758 | /* indicate failures (see extension below) */ |
b12d437b JB |
1759 | |
1760 | /* | |
1761 | * This offset tracks the progress of the repair or replacement of | |
1762 | * an individual drive. | |
1763 | */ | |
1764 | __le64 disk_recovery_offset; | |
1765 | ||
1766 | /* | |
33e53f06 | 1767 | * This offset tracks the progress of the initial raid set |
b12d437b JB |
1768 | * synchronisation/parity calculation. |
1769 | */ | |
1770 | __le64 array_resync_offset; | |
1771 | ||
1772 | /* | |
33e53f06 | 1773 | * raid characteristics |
b12d437b JB |
1774 | */ |
1775 | __le32 level; | |
1776 | __le32 layout; | |
1777 | __le32 stripe_sectors; | |
1778 | ||
33e53f06 | 1779 | /******************************************************************** |
9b6e5423 | 1780 | * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!! |
33e53f06 | 1781 | * |
9b6e5423 | 1782 | * FEATURE_FLAG_SUPPORTS_V190 in the features member indicates that those exist |
33e53f06 HM |
1783 | */ |
1784 | ||
1785 | __le32 flags; /* Flags defining array states for reshaping */ | |
1786 | ||
1787 | /* | |
1788 | * This offset tracks the progress of a raid | |
1789 | * set reshape in order to be able to restart it | |
1790 | */ | |
1791 | __le64 reshape_position; | |
1792 | ||
1793 | /* | |
1794 | * These define the properties of the array in case of an interrupted reshape | |
1795 | */ | |
1796 | __le32 new_level; | |
1797 | __le32 new_layout; | |
1798 | __le32 new_stripe_sectors; | |
1799 | __le32 delta_disks; | |
1800 | ||
1801 | __le64 array_sectors; /* Array size in sectors */ | |
1802 | ||
1803 | /* | |
1804 | * Sector offsets to data on devices (reshaping). | |
1805 | * Needed to support out of place reshaping, thus | |
1806 | * not writing over any stripes whilst converting | |
1807 | * them from old to new layout | |
1808 | */ | |
1809 | __le64 data_offset; | |
1810 | __le64 new_data_offset; | |
1811 | ||
1812 | __le64 sectors; /* Used device size in sectors */ | |
1813 | ||
1814 | /* | |
1815 | * Additonal Bit field of devices indicating failures to support | |
9b6e5423 | 1816 | * up to 256 devices with the 1.9.0 on-disk metadata format |
33e53f06 HM |
1817 | */ |
1818 | __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1]; | |
1819 | ||
1820 | __le32 incompat_features; /* Used to indicate any incompatible features */ | |
1821 | ||
1822 | /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */ | |
b12d437b JB |
1823 | } __packed; |
1824 | ||
9dbd1aa3 HM |
1825 | /* |
1826 | * Check for reshape constraints on raid set @rs: | |
1827 | * | |
1828 | * - reshape function non-existent | |
1829 | * - degraded set | |
1830 | * - ongoing recovery | |
1831 | * - ongoing reshape | |
1832 | * | |
1833 | * Returns 0 if none or -EPERM if given constraint | |
1834 | * and error message reference in @errmsg | |
1835 | */ | |
1836 | static int rs_check_reshape(struct raid_set *rs) | |
1837 | { | |
1838 | struct mddev *mddev = &rs->md; | |
1839 | ||
9dbd1aa3 HM |
1840 | if (!mddev->pers || !mddev->pers->check_reshape) |
1841 | rs->ti->error = "Reshape not supported"; | |
1842 | else if (mddev->degraded) | |
1843 | rs->ti->error = "Can't reshape degraded raid set"; | |
1844 | else if (rs_is_recovering(rs)) | |
1845 | rs->ti->error = "Convert request on recovering raid set prohibited"; | |
469b304b | 1846 | else if (rs_is_reshaping(rs)) |
9dbd1aa3 | 1847 | rs->ti->error = "raid set already reshaping!"; |
7a7c330f HM |
1848 | else if (!(rs_is_raid1(rs) || rs_is_raid10(rs) || rs_is_raid456(rs))) |
1849 | rs->ti->error = "Reshaping only supported for raid1/4/5/6/10"; | |
9dbd1aa3 HM |
1850 | else |
1851 | return 0; | |
1852 | ||
1853 | return -EPERM; | |
1854 | } | |
1855 | ||
3cb03002 | 1856 | static int read_disk_sb(struct md_rdev *rdev, int size) |
b12d437b JB |
1857 | { |
1858 | BUG_ON(!rdev->sb_page); | |
1859 | ||
1860 | if (rdev->sb_loaded) | |
1861 | return 0; | |
1862 | ||
0a7b8188 | 1863 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) { |
0447568f JB |
1864 | DMERR("Failed to read superblock of device at position %d", |
1865 | rdev->raid_disk); | |
c32fb9e7 | 1866 | md_error(rdev->mddev, rdev); |
b12d437b JB |
1867 | return -EINVAL; |
1868 | } | |
1869 | ||
1870 | rdev->sb_loaded = 1; | |
1871 | ||
1872 | return 0; | |
1873 | } | |
1874 | ||
33e53f06 HM |
1875 | static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices) |
1876 | { | |
1877 | failed_devices[0] = le64_to_cpu(sb->failed_devices); | |
1878 | memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices)); | |
1879 | ||
4286325b | 1880 | if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) { |
33e53f06 HM |
1881 | int i = ARRAY_SIZE(sb->extended_failed_devices); |
1882 | ||
1883 | while (i--) | |
1884 | failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]); | |
1885 | } | |
1886 | } | |
1887 | ||
7b34df74 HM |
1888 | static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices) |
1889 | { | |
1890 | int i = ARRAY_SIZE(sb->extended_failed_devices); | |
1891 | ||
1892 | sb->failed_devices = cpu_to_le64(failed_devices[0]); | |
1893 | while (i--) | |
1894 | sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]); | |
1895 | } | |
1896 | ||
1897 | /* | |
1898 | * Synchronize the superblock members with the raid set properties | |
1899 | * | |
1900 | * All superblock data is little endian. | |
1901 | */ | |
fd01b88c | 1902 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b | 1903 | { |
7b34df74 HM |
1904 | bool update_failed_devices = false; |
1905 | unsigned int i; | |
1906 | uint64_t failed_devices[DISKS_ARRAY_ELEMS]; | |
b12d437b | 1907 | struct dm_raid_superblock *sb; |
81f382f9 | 1908 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
b12d437b | 1909 | |
7b34df74 HM |
1910 | /* No metadata device, no superblock */ |
1911 | if (!rdev->meta_bdev) | |
1912 | return; | |
1913 | ||
1914 | BUG_ON(!rdev->sb_page); | |
1915 | ||
b12d437b | 1916 | sb = page_address(rdev->sb_page); |
b12d437b | 1917 | |
7b34df74 | 1918 | sb_retrieve_failed_devices(sb, failed_devices); |
b12d437b | 1919 | |
7b34df74 HM |
1920 | for (i = 0; i < rs->raid_disks; i++) |
1921 | if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) { | |
1922 | update_failed_devices = true; | |
1923 | set_bit(i, (void *) failed_devices); | |
1924 | } | |
1925 | ||
1926 | if (update_failed_devices) | |
1927 | sb_update_failed_devices(sb, failed_devices); | |
b12d437b JB |
1928 | |
1929 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); | |
9b6e5423 | 1930 | sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190); |
b12d437b JB |
1931 | |
1932 | sb->num_devices = cpu_to_le32(mddev->raid_disks); | |
1933 | sb->array_position = cpu_to_le32(rdev->raid_disk); | |
1934 | ||
1935 | sb->events = cpu_to_le64(mddev->events); | |
b12d437b JB |
1936 | |
1937 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1938 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1939 | ||
1940 | sb->level = cpu_to_le32(mddev->level); | |
1941 | sb->layout = cpu_to_le32(mddev->layout); | |
1942 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); | |
7b34df74 HM |
1943 | |
1944 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1945 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1946 | sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors); | |
1947 | ||
1948 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1949 | ||
1950 | smp_rmb(); /* Make sure we access most recent reshape position */ | |
1951 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1952 | if (le64_to_cpu(sb->reshape_position) != MaxSector) { | |
1953 | /* Flag ongoing reshape */ | |
1954 | sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE); | |
1955 | ||
1956 | if (mddev->delta_disks < 0 || mddev->reshape_backwards) | |
1957 | sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS); | |
4286325b MS |
1958 | } else { |
1959 | /* Clear reshape flags */ | |
1960 | sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS)); | |
1961 | } | |
7b34df74 HM |
1962 | |
1963 | sb->array_sectors = cpu_to_le64(mddev->array_sectors); | |
1964 | sb->data_offset = cpu_to_le64(rdev->data_offset); | |
1965 | sb->new_data_offset = cpu_to_le64(rdev->new_data_offset); | |
1966 | sb->sectors = cpu_to_le64(rdev->sectors); | |
b2a4872a | 1967 | sb->incompat_features = cpu_to_le32(0); |
7b34df74 HM |
1968 | |
1969 | /* Zero out the rest of the payload after the size of the superblock */ | |
1970 | memset(sb + 1, 0, rdev->sb_size - sizeof(*sb)); | |
b12d437b JB |
1971 | } |
1972 | ||
1973 | /* | |
1974 | * super_load | |
1975 | * | |
1976 | * This function creates a superblock if one is not found on the device | |
1977 | * and will decide which superblock to use if there's a choice. | |
1978 | * | |
1979 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise | |
1980 | */ | |
3cb03002 | 1981 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
b12d437b | 1982 | { |
73c6f239 | 1983 | int r; |
b12d437b JB |
1984 | struct dm_raid_superblock *sb; |
1985 | struct dm_raid_superblock *refsb; | |
1986 | uint64_t events_sb, events_refsb; | |
1987 | ||
1988 | rdev->sb_start = 0; | |
40d43c4b HM |
1989 | rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev); |
1990 | if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) { | |
1991 | DMERR("superblock size of a logical block is no longer valid"); | |
1992 | return -EINVAL; | |
1993 | } | |
b12d437b | 1994 | |
73c6f239 HM |
1995 | r = read_disk_sb(rdev, rdev->sb_size); |
1996 | if (r) | |
1997 | return r; | |
b12d437b JB |
1998 | |
1999 | sb = page_address(rdev->sb_page); | |
3aa3b2b2 JB |
2000 | |
2001 | /* | |
2002 | * Two cases that we want to write new superblocks and rebuild: | |
2003 | * 1) New device (no matching magic number) | |
2004 | * 2) Device specified for rebuild (!In_sync w/ offset == 0) | |
2005 | */ | |
2006 | if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) || | |
2007 | (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) { | |
b12d437b JB |
2008 | super_sync(rdev->mddev, rdev); |
2009 | ||
2010 | set_bit(FirstUse, &rdev->flags); | |
9b6e5423 | 2011 | sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190); |
b12d437b JB |
2012 | |
2013 | /* Force writing of superblocks to disk */ | |
2014 | set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); | |
2015 | ||
2016 | /* Any superblock is better than none, choose that if given */ | |
2017 | return refdev ? 0 : 1; | |
2018 | } | |
2019 | ||
2020 | if (!refdev) | |
2021 | return 1; | |
2022 | ||
2023 | events_sb = le64_to_cpu(sb->events); | |
2024 | ||
2025 | refsb = page_address(refdev->sb_page); | |
2026 | events_refsb = le64_to_cpu(refsb->events); | |
2027 | ||
2028 | return (events_sb > events_refsb) ? 1 : 0; | |
2029 | } | |
2030 | ||
33e53f06 | 2031 | static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev) |
b12d437b JB |
2032 | { |
2033 | int role; | |
33e53f06 HM |
2034 | unsigned int d; |
2035 | struct mddev *mddev = &rs->md; | |
b12d437b | 2036 | uint64_t events_sb; |
33e53f06 | 2037 | uint64_t failed_devices[DISKS_ARRAY_ELEMS]; |
b12d437b | 2038 | struct dm_raid_superblock *sb; |
33e53f06 | 2039 | uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0; |
dafb20fa | 2040 | struct md_rdev *r; |
b12d437b JB |
2041 | struct dm_raid_superblock *sb2; |
2042 | ||
2043 | sb = page_address(rdev->sb_page); | |
2044 | events_sb = le64_to_cpu(sb->events); | |
b12d437b JB |
2045 | |
2046 | /* | |
2047 | * Initialise to 1 if this is a new superblock. | |
2048 | */ | |
2049 | mddev->events = events_sb ? : 1; | |
2050 | ||
33e53f06 HM |
2051 | mddev->reshape_position = MaxSector; |
2052 | ||
b12d437b | 2053 | /* |
33e53f06 HM |
2054 | * Reshaping is supported, e.g. reshape_position is valid |
2055 | * in superblock and superblock content is authoritative. | |
b12d437b | 2056 | */ |
4286325b | 2057 | if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) { |
33e53f06 HM |
2058 | /* Superblock is authoritative wrt given raid set layout! */ |
2059 | mddev->raid_disks = le32_to_cpu(sb->num_devices); | |
2060 | mddev->level = le32_to_cpu(sb->level); | |
2061 | mddev->layout = le32_to_cpu(sb->layout); | |
2062 | mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors); | |
2063 | mddev->new_level = le32_to_cpu(sb->new_level); | |
2064 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
2065 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors); | |
2066 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
2067 | mddev->array_sectors = le64_to_cpu(sb->array_sectors); | |
2068 | ||
2069 | /* raid was reshaping and got interrupted */ | |
4286325b MS |
2070 | if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) { |
2071 | if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) { | |
33e53f06 HM |
2072 | DMERR("Reshape requested but raid set is still reshaping"); |
2073 | return -EINVAL; | |
2074 | } | |
b12d437b | 2075 | |
33e53f06 | 2076 | if (mddev->delta_disks < 0 || |
4286325b | 2077 | (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS))) |
33e53f06 HM |
2078 | mddev->reshape_backwards = 1; |
2079 | else | |
2080 | mddev->reshape_backwards = 0; | |
2081 | ||
2082 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
2083 | rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout); | |
2084 | } | |
2085 | ||
2086 | } else { | |
2087 | /* | |
9b6e5423 | 2088 | * No takeover/reshaping, because we don't have the extended v1.9.0 metadata |
33e53f06 | 2089 | */ |
b052b07c | 2090 | if (le32_to_cpu(sb->level) != mddev->new_level) { |
33e53f06 HM |
2091 | DMERR("Reshaping/takeover raid sets not yet supported. (raid level/stripes/size change)"); |
2092 | return -EINVAL; | |
2093 | } | |
b052b07c | 2094 | if (le32_to_cpu(sb->layout) != mddev->new_layout) { |
33e53f06 | 2095 | DMERR("Reshaping raid sets not yet supported. (raid layout change)"); |
43157840 MS |
2096 | DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout); |
2097 | DMERR(" Old layout: %s w/ %d copies", | |
33e53f06 HM |
2098 | raid10_md_layout_to_format(le32_to_cpu(sb->layout)), |
2099 | raid10_md_layout_to_copies(le32_to_cpu(sb->layout))); | |
43157840 | 2100 | DMERR(" New layout: %s w/ %d copies", |
33e53f06 HM |
2101 | raid10_md_layout_to_format(mddev->layout), |
2102 | raid10_md_layout_to_copies(mddev->layout)); | |
2103 | return -EINVAL; | |
2104 | } | |
b052b07c | 2105 | if (le32_to_cpu(sb->stripe_sectors) != mddev->new_chunk_sectors) { |
33e53f06 HM |
2106 | DMERR("Reshaping raid sets not yet supported. (stripe sectors change)"); |
2107 | return -EINVAL; | |
2108 | } | |
2109 | ||
2110 | /* We can only change the number of devices in raid1 with old (i.e. pre 1.0.7) metadata */ | |
2111 | if (!rt_is_raid1(rs->raid_type) && | |
2112 | (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) { | |
2113 | DMERR("Reshaping raid sets not yet supported. (device count change from %u to %u)", | |
2114 | sb->num_devices, mddev->raid_disks); | |
2115 | return -EINVAL; | |
2116 | } | |
2117 | ||
b052b07c HM |
2118 | DMINFO("Discovered old metadata format; upgrading to extended metadata format"); |
2119 | ||
33e53f06 HM |
2120 | /* Table line is checked vs. authoritative superblock */ |
2121 | rs_set_new(rs); | |
b12d437b JB |
2122 | } |
2123 | ||
4286325b | 2124 | if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) |
b12d437b JB |
2125 | mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); |
2126 | ||
2127 | /* | |
2128 | * During load, we set FirstUse if a new superblock was written. | |
2129 | * There are two reasons we might not have a superblock: | |
33e53f06 | 2130 | * 1) The raid set is brand new - in which case, all of the |
43157840 | 2131 | * devices must have their In_sync bit set. Also, |
b12d437b | 2132 | * recovery_cp must be 0, unless forced. |
33e53f06 | 2133 | * 2) This is a new device being added to an old raid set |
b12d437b JB |
2134 | * and the new device needs to be rebuilt - in which |
2135 | * case the In_sync bit will /not/ be set and | |
2136 | * recovery_cp must be MaxSector. | |
9dbd1aa3 HM |
2137 | * 3) This is/are a new device(s) being added to an old |
2138 | * raid set during takeover to a higher raid level | |
2139 | * to provide capacity for redundancy or during reshape | |
2140 | * to add capacity to grow the raid set. | |
b12d437b | 2141 | */ |
33e53f06 | 2142 | d = 0; |
dafb20fa | 2143 | rdev_for_each(r, mddev) { |
33e53f06 HM |
2144 | if (test_bit(FirstUse, &r->flags)) |
2145 | new_devs++; | |
2146 | ||
b12d437b | 2147 | if (!test_bit(In_sync, &r->flags)) { |
33e53f06 HM |
2148 | DMINFO("Device %d specified for rebuild; clearing superblock", |
2149 | r->raid_disk); | |
b12d437b | 2150 | rebuilds++; |
33e53f06 HM |
2151 | |
2152 | if (test_bit(FirstUse, &r->flags)) | |
2153 | rebuild_and_new++; | |
2154 | } | |
2155 | ||
2156 | d++; | |
b12d437b JB |
2157 | } |
2158 | ||
33e53f06 HM |
2159 | if (new_devs == rs->raid_disks || !rebuilds) { |
2160 | /* Replace a broken device */ | |
2161 | if (new_devs == 1 && !rs->delta_disks) | |
2162 | ; | |
2163 | if (new_devs == rs->raid_disks) { | |
2164 | DMINFO("Superblocks created for new raid set"); | |
b12d437b | 2165 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); |
9dbd1aa3 HM |
2166 | } else if (new_devs != rebuilds && |
2167 | new_devs != rs->delta_disks) { | |
33e53f06 HM |
2168 | DMERR("New device injected into existing raid set without " |
2169 | "'delta_disks' or 'rebuild' parameter specified"); | |
b12d437b JB |
2170 | return -EINVAL; |
2171 | } | |
33e53f06 HM |
2172 | } else if (new_devs && new_devs != rebuilds) { |
2173 | DMERR("%u 'rebuild' devices cannot be injected into" | |
2174 | " a raid set with %u other first-time devices", | |
2175 | rebuilds, new_devs); | |
b12d437b | 2176 | return -EINVAL; |
33e53f06 HM |
2177 | } else if (rebuilds) { |
2178 | if (rebuild_and_new && rebuilds != rebuild_and_new) { | |
2179 | DMERR("new device%s provided without 'rebuild'", | |
2180 | new_devs > 1 ? "s" : ""); | |
2181 | return -EINVAL; | |
9dbd1aa3 | 2182 | } else if (rs_is_recovering(rs)) { |
33e53f06 HM |
2183 | DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)", |
2184 | (unsigned long long) mddev->recovery_cp); | |
2185 | return -EINVAL; | |
9dbd1aa3 HM |
2186 | } else if (rs_is_reshaping(rs)) { |
2187 | DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)", | |
2188 | (unsigned long long) mddev->reshape_position); | |
33e53f06 HM |
2189 | return -EINVAL; |
2190 | } | |
b12d437b JB |
2191 | } |
2192 | ||
2193 | /* | |
2194 | * Now we set the Faulty bit for those devices that are | |
2195 | * recorded in the superblock as failed. | |
2196 | */ | |
33e53f06 | 2197 | sb_retrieve_failed_devices(sb, failed_devices); |
dafb20fa | 2198 | rdev_for_each(r, mddev) { |
b12d437b JB |
2199 | if (!r->sb_page) |
2200 | continue; | |
2201 | sb2 = page_address(r->sb_page); | |
2202 | sb2->failed_devices = 0; | |
33e53f06 | 2203 | memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices)); |
b12d437b JB |
2204 | |
2205 | /* | |
2206 | * Check for any device re-ordering. | |
2207 | */ | |
2208 | if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) { | |
2209 | role = le32_to_cpu(sb2->array_position); | |
33e53f06 HM |
2210 | if (role < 0) |
2211 | continue; | |
2212 | ||
b12d437b | 2213 | if (role != r->raid_disk) { |
e6ca5e1a MS |
2214 | if (__is_raid10_near(mddev->layout)) { |
2215 | if (mddev->raid_disks % __raid10_near_copies(mddev->layout) || | |
bd83a4c4 MS |
2216 | rs->raid_disks % rs->raid10_copies) { |
2217 | rs->ti->error = | |
2218 | "Cannot change raid10 near set to odd # of devices!"; | |
2219 | return -EINVAL; | |
2220 | } | |
33e53f06 HM |
2221 | |
2222 | sb2->array_position = cpu_to_le32(r->raid_disk); | |
2223 | ||
2224 | } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) && | |
bd83a4c4 MS |
2225 | !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) && |
2226 | !rt_is_raid1(rs->raid_type)) { | |
2227 | rs->ti->error = "Cannot change device positions in raid set"; | |
2228 | return -EINVAL; | |
2229 | } | |
33e53f06 | 2230 | |
bd83a4c4 | 2231 | DMINFO("raid device #%d now at position #%d", role, r->raid_disk); |
b12d437b JB |
2232 | } |
2233 | ||
2234 | /* | |
2235 | * Partial recovery is performed on | |
2236 | * returning failed devices. | |
2237 | */ | |
33e53f06 | 2238 | if (test_bit(role, (void *) failed_devices)) |
b12d437b JB |
2239 | set_bit(Faulty, &r->flags); |
2240 | } | |
2241 | } | |
2242 | ||
2243 | return 0; | |
2244 | } | |
2245 | ||
0cf45031 | 2246 | static int super_validate(struct raid_set *rs, struct md_rdev *rdev) |
b12d437b | 2247 | { |
0cf45031 | 2248 | struct mddev *mddev = &rs->md; |
33e53f06 HM |
2249 | struct dm_raid_superblock *sb; |
2250 | ||
3a1c1ef2 | 2251 | if (rs_is_raid0(rs) || !rdev->sb_page) |
33e53f06 HM |
2252 | return 0; |
2253 | ||
2254 | sb = page_address(rdev->sb_page); | |
b12d437b JB |
2255 | |
2256 | /* | |
2257 | * If mddev->events is not set, we know we have not yet initialized | |
2258 | * the array. | |
2259 | */ | |
33e53f06 | 2260 | if (!mddev->events && super_init_validation(rs, rdev)) |
b12d437b JB |
2261 | return -EINVAL; |
2262 | ||
5c33677c AW |
2263 | if (le32_to_cpu(sb->compat_features) && |
2264 | le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) { | |
9b6e5423 MS |
2265 | rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags"; |
2266 | return -EINVAL; | |
2267 | } | |
2268 | ||
2269 | if (sb->incompat_features) { | |
ecbfb9f1 | 2270 | rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet"; |
4c9971ca HM |
2271 | return -EINVAL; |
2272 | } | |
2273 | ||
0cf45031 | 2274 | /* Enable bitmap creation for RAID levels != 0 */ |
676fa5ad | 2275 | mddev->bitmap_info.offset = rt_is_raid0(rs->raid_type) ? 0 : to_sector(4096); |
0cf45031 HM |
2276 | rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset; |
2277 | ||
33e53f06 HM |
2278 | if (!test_and_clear_bit(FirstUse, &rdev->flags)) { |
2279 | /* Retrieve device size stored in superblock to be prepared for shrink */ | |
2280 | rdev->sectors = le64_to_cpu(sb->sectors); | |
b12d437b | 2281 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); |
33e53f06 HM |
2282 | if (rdev->recovery_offset == MaxSector) |
2283 | set_bit(In_sync, &rdev->flags); | |
2284 | /* | |
2285 | * If no reshape in progress -> we're recovering single | |
2286 | * disk(s) and have to set the device(s) to out-of-sync | |
2287 | */ | |
9dbd1aa3 | 2288 | else if (!rs_is_reshaping(rs)) |
33e53f06 | 2289 | clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */ |
b12d437b JB |
2290 | } |
2291 | ||
2292 | /* | |
2293 | * If a device comes back, set it as not In_sync and no longer faulty. | |
2294 | */ | |
33e53f06 HM |
2295 | if (test_and_clear_bit(Faulty, &rdev->flags)) { |
2296 | rdev->recovery_offset = 0; | |
b12d437b JB |
2297 | clear_bit(In_sync, &rdev->flags); |
2298 | rdev->saved_raid_disk = rdev->raid_disk; | |
b12d437b JB |
2299 | } |
2300 | ||
33e53f06 HM |
2301 | /* Reshape support -> restore repective data offsets */ |
2302 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
2303 | rdev->new_data_offset = le64_to_cpu(sb->new_data_offset); | |
b12d437b JB |
2304 | |
2305 | return 0; | |
2306 | } | |
2307 | ||
2308 | /* | |
2309 | * Analyse superblocks and select the freshest. | |
2310 | */ | |
2311 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) | |
2312 | { | |
73c6f239 | 2313 | int r; |
0447568f | 2314 | struct raid_dev *dev; |
a9ad8526 | 2315 | struct md_rdev *rdev, *tmp, *freshest; |
fd01b88c | 2316 | struct mddev *mddev = &rs->md; |
b12d437b JB |
2317 | |
2318 | freshest = NULL; | |
a9ad8526 | 2319 | rdev_for_each_safe(rdev, tmp, mddev) { |
761becff | 2320 | /* |
c76d53f4 | 2321 | * Skipping super_load due to CTR_FLAG_SYNC will cause |
761becff | 2322 | * the array to undergo initialization again as |
43157840 | 2323 | * though it were new. This is the intended effect |
761becff JB |
2324 | * of the "sync" directive. |
2325 | * | |
2326 | * When reshaping capability is added, we must ensure | |
2327 | * that the "sync" directive is disallowed during the | |
2328 | * reshape. | |
2329 | */ | |
4286325b | 2330 | if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) |
761becff JB |
2331 | continue; |
2332 | ||
b12d437b JB |
2333 | if (!rdev->meta_bdev) |
2334 | continue; | |
2335 | ||
73c6f239 | 2336 | r = super_load(rdev, freshest); |
b12d437b | 2337 | |
73c6f239 | 2338 | switch (r) { |
b12d437b JB |
2339 | case 1: |
2340 | freshest = rdev; | |
2341 | break; | |
2342 | case 0: | |
2343 | break; | |
2344 | default: | |
9e7d9367 HM |
2345 | /* |
2346 | * We have to keep any raid0 data/metadata device pairs or | |
2347 | * the MD raid0 personality will fail to start the array. | |
2348 | */ | |
2349 | if (rs_is_raid0(rs)) | |
2350 | continue; | |
2351 | ||
0447568f | 2352 | dev = container_of(rdev, struct raid_dev, rdev); |
55ebbb59 JB |
2353 | if (dev->meta_dev) |
2354 | dm_put_device(ti, dev->meta_dev); | |
0447568f | 2355 | |
55ebbb59 JB |
2356 | dev->meta_dev = NULL; |
2357 | rdev->meta_bdev = NULL; | |
0447568f | 2358 | |
55ebbb59 JB |
2359 | if (rdev->sb_page) |
2360 | put_page(rdev->sb_page); | |
0447568f | 2361 | |
55ebbb59 | 2362 | rdev->sb_page = NULL; |
0447568f | 2363 | |
55ebbb59 | 2364 | rdev->sb_loaded = 0; |
0447568f | 2365 | |
55ebbb59 JB |
2366 | /* |
2367 | * We might be able to salvage the data device | |
2368 | * even though the meta device has failed. For | |
2369 | * now, we behave as though '- -' had been | |
2370 | * set for this device in the table. | |
2371 | */ | |
2372 | if (dev->data_dev) | |
2373 | dm_put_device(ti, dev->data_dev); | |
0447568f | 2374 | |
55ebbb59 JB |
2375 | dev->data_dev = NULL; |
2376 | rdev->bdev = NULL; | |
0447568f | 2377 | |
55ebbb59 | 2378 | list_del(&rdev->same_set); |
b12d437b JB |
2379 | } |
2380 | } | |
2381 | ||
2382 | if (!freshest) | |
2383 | return 0; | |
2384 | ||
bd83a4c4 MS |
2385 | if (validate_raid_redundancy(rs)) { |
2386 | rs->ti->error = "Insufficient redundancy to activate array"; | |
2387 | return -EINVAL; | |
2388 | } | |
55ebbb59 | 2389 | |
b12d437b JB |
2390 | /* |
2391 | * Validation of the freshest device provides the source of | |
2392 | * validation for the remaining devices. | |
2393 | */ | |
9dbd1aa3 HM |
2394 | rs->ti->error = "Unable to assemble array: Invalid superblocks"; |
2395 | if (super_validate(rs, freshest)) | |
bd83a4c4 | 2396 | return -EINVAL; |
b12d437b | 2397 | |
dafb20fa | 2398 | rdev_for_each(rdev, mddev) |
0cf45031 | 2399 | if ((rdev != freshest) && super_validate(rs, rdev)) |
b12d437b | 2400 | return -EINVAL; |
b12d437b JB |
2401 | return 0; |
2402 | } | |
2403 | ||
40ba37e5 HM |
2404 | /* |
2405 | * Adjust data_offset and new_data_offset on all disk members of @rs | |
2406 | * for out of place reshaping if requested by contructor | |
2407 | * | |
2408 | * We need free space at the beginning of each raid disk for forward | |
2409 | * and at the end for backward reshapes which userspace has to provide | |
2410 | * via remapping/reordering of space. | |
2411 | */ | |
2412 | static int rs_adjust_data_offsets(struct raid_set *rs) | |
2413 | { | |
2414 | sector_t data_offset = 0, new_data_offset = 0; | |
2415 | struct md_rdev *rdev; | |
2416 | ||
2417 | /* Constructor did not request data offset change */ | |
2418 | if (!test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) { | |
2419 | if (!rs_is_reshapable(rs)) | |
2420 | goto out; | |
2421 | ||
2422 | return 0; | |
2423 | } | |
2424 | ||
2425 | /* HM FIXME: get InSync raid_dev? */ | |
2426 | rdev = &rs->dev[0].rdev; | |
2427 | ||
2428 | if (rs->delta_disks < 0) { | |
2429 | /* | |
2430 | * Removing disks (reshaping backwards): | |
2431 | * | |
2432 | * - before reshape: data is at offset 0 and free space | |
2433 | * is at end of each component LV | |
2434 | * | |
2435 | * - after reshape: data is at offset rs->data_offset != 0 on each component LV | |
2436 | */ | |
2437 | data_offset = 0; | |
2438 | new_data_offset = rs->data_offset; | |
2439 | ||
2440 | } else if (rs->delta_disks > 0) { | |
2441 | /* | |
2442 | * Adding disks (reshaping forwards): | |
2443 | * | |
2444 | * - before reshape: data is at offset rs->data_offset != 0 and | |
2445 | * free space is at begin of each component LV | |
2446 | * | |
2447 | * - after reshape: data is at offset 0 on each component LV | |
2448 | */ | |
2449 | data_offset = rs->data_offset; | |
2450 | new_data_offset = 0; | |
2451 | ||
2452 | } else { | |
2453 | /* | |
2454 | * User space passes in 0 for data offset after having removed reshape space | |
2455 | * | |
2456 | * - or - (data offset != 0) | |
2457 | * | |
2458 | * Changing RAID layout or chunk size -> toggle offsets | |
2459 | * | |
2460 | * - before reshape: data is at offset rs->data_offset 0 and | |
2461 | * free space is at end of each component LV | |
2462 | * -or- | |
2463 | * data is at offset rs->data_offset != 0 and | |
2464 | * free space is at begin of each component LV | |
2465 | * | |
2527b56e HM |
2466 | * - after reshape: data is at offset 0 if it was at offset != 0 |
2467 | * or at offset != 0 if it was at offset 0 | |
40ba37e5 HM |
2468 | * on each component LV |
2469 | * | |
2470 | */ | |
2471 | data_offset = rs->data_offset ? rdev->data_offset : 0; | |
2472 | new_data_offset = data_offset ? 0 : rs->data_offset; | |
2473 | set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); | |
2474 | } | |
2475 | ||
2476 | /* | |
2477 | * Make sure we got a minimum amount of free sectors per device | |
2478 | */ | |
2479 | if (rs->data_offset && | |
2480 | to_sector(i_size_read(rdev->bdev->bd_inode)) - rdev->sectors < MIN_FREE_RESHAPE_SPACE) { | |
2481 | rs->ti->error = data_offset ? "No space for forward reshape" : | |
2482 | "No space for backward reshape"; | |
2483 | return -ENOSPC; | |
2484 | } | |
2485 | out: | |
2486 | /* Adjust data offsets on all rdevs */ | |
2487 | rdev_for_each(rdev, &rs->md) { | |
2488 | rdev->data_offset = data_offset; | |
2489 | rdev->new_data_offset = new_data_offset; | |
2490 | } | |
2491 | ||
2492 | return 0; | |
2493 | } | |
2494 | ||
ecbfb9f1 | 2495 | /* Userpace reordered disks -> adjust raid_disk indexes in @rs */ |
e6ca5e1a | 2496 | static void __reorder_raid_disk_indexes(struct raid_set *rs) |
ecbfb9f1 HM |
2497 | { |
2498 | int i = 0; | |
2499 | struct md_rdev *rdev; | |
2500 | ||
2501 | rdev_for_each(rdev, &rs->md) { | |
2502 | rdev->raid_disk = i++; | |
2503 | rdev->saved_raid_disk = rdev->new_raid_disk = -1; | |
2504 | } | |
2505 | } | |
2506 | ||
2507 | /* | |
2508 | * Setup @rs for takeover by a different raid level | |
2509 | */ | |
2510 | static int rs_setup_takeover(struct raid_set *rs) | |
2511 | { | |
2512 | struct mddev *mddev = &rs->md; | |
2513 | struct md_rdev *rdev; | |
2514 | unsigned int d = mddev->raid_disks = rs->raid_disks; | |
2515 | sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset; | |
2516 | ||
2517 | if (rt_is_raid10(rs->raid_type)) { | |
2518 | if (mddev->level == 0) { | |
2519 | /* Userpace reordered disks -> adjust raid_disk indexes */ | |
e6ca5e1a | 2520 | __reorder_raid_disk_indexes(rs); |
ecbfb9f1 HM |
2521 | |
2522 | /* raid0 -> raid10_far layout */ | |
2523 | mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR, | |
2524 | rs->raid10_copies); | |
2525 | } else if (mddev->level == 1) | |
2526 | /* raid1 -> raid10_near layout */ | |
2527 | mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR, | |
2528 | rs->raid_disks); | |
094f394d | 2529 | else |
ecbfb9f1 HM |
2530 | return -EINVAL; |
2531 | ||
2532 | } | |
2533 | ||
2534 | clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags); | |
2535 | mddev->recovery_cp = MaxSector; | |
2536 | ||
2537 | while (d--) { | |
2538 | rdev = &rs->dev[d].rdev; | |
2539 | ||
2540 | if (test_bit(d, (void *) rs->rebuild_disks)) { | |
2541 | clear_bit(In_sync, &rdev->flags); | |
2542 | clear_bit(Faulty, &rdev->flags); | |
2543 | mddev->recovery_cp = rdev->recovery_offset = 0; | |
2544 | /* Bitmap has to be created when we do an "up" takeover */ | |
2545 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); | |
2546 | } | |
2547 | ||
2548 | rdev->new_data_offset = new_data_offset; | |
2549 | } | |
2550 | ||
ecbfb9f1 HM |
2551 | return 0; |
2552 | } | |
2553 | ||
469b304b HM |
2554 | /* Prepare @rs for reshape */ |
2555 | static int rs_prepare_reshape(struct raid_set *rs) | |
2556 | { | |
2557 | bool reshape; | |
2558 | struct mddev *mddev = &rs->md; | |
2559 | ||
2560 | if (rs_is_raid10(rs)) { | |
2561 | if (rs->raid_disks != mddev->raid_disks && | |
2562 | __is_raid10_near(mddev->layout) && | |
2563 | rs->raid10_copies && | |
2564 | rs->raid10_copies != __raid10_near_copies(mddev->layout)) { | |
2565 | /* | |
2566 | * raid disk have to be multiple of data copies to allow this conversion, | |
2567 | * | |
2568 | * This is actually not a reshape it is a | |
2569 | * rebuild of any additional mirrors per group | |
2570 | */ | |
2571 | if (rs->raid_disks % rs->raid10_copies) { | |
2572 | rs->ti->error = "Can't reshape raid10 mirror groups"; | |
2573 | return -EINVAL; | |
2574 | } | |
2575 | ||
2576 | /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */ | |
2577 | __reorder_raid_disk_indexes(rs); | |
2578 | mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR, | |
2579 | rs->raid10_copies); | |
2580 | mddev->new_layout = mddev->layout; | |
2581 | reshape = false; | |
2582 | } else | |
2583 | reshape = true; | |
2584 | ||
2585 | } else if (rs_is_raid456(rs)) | |
2586 | reshape = true; | |
2587 | ||
469b304b | 2588 | else if (rs_is_raid1(rs)) { |
7a7c330f HM |
2589 | if (rs->delta_disks) { |
2590 | /* Process raid1 via delta_disks */ | |
2591 | mddev->degraded = rs->delta_disks < 0 ? -rs->delta_disks : rs->delta_disks; | |
2592 | reshape = true; | |
2593 | } else { | |
2594 | /* Process raid1 without delta_disks */ | |
2595 | mddev->raid_disks = rs->raid_disks; | |
7a7c330f HM |
2596 | reshape = false; |
2597 | } | |
469b304b HM |
2598 | } else { |
2599 | rs->ti->error = "Called with bogus raid type"; | |
2600 | return -EINVAL; | |
2601 | } | |
2602 | ||
2603 | if (reshape) { | |
2604 | set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags); | |
2605 | set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); | |
7a7c330f HM |
2606 | } else if (mddev->raid_disks < rs->raid_disks) |
2607 | /* Create new superblocks and bitmaps, if any new disks */ | |
469b304b | 2608 | set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); |
469b304b HM |
2609 | |
2610 | return 0; | |
2611 | } | |
2612 | ||
9dbd1aa3 HM |
2613 | /* |
2614 | * | |
2615 | * - change raid layout | |
2616 | * - change chunk size | |
2617 | * - add disks | |
2618 | * - remove disks | |
2619 | */ | |
2620 | static int rs_setup_reshape(struct raid_set *rs) | |
2621 | { | |
2622 | int r = 0; | |
2623 | unsigned int cur_raid_devs, d; | |
2624 | struct mddev *mddev = &rs->md; | |
2625 | struct md_rdev *rdev; | |
2626 | ||
2627 | mddev->delta_disks = rs->delta_disks; | |
2628 | cur_raid_devs = mddev->raid_disks; | |
2629 | ||
2630 | /* Ignore impossible layout change whilst adding/removing disks */ | |
2631 | if (mddev->delta_disks && | |
2632 | mddev->layout != mddev->new_layout) { | |
2633 | DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks); | |
2634 | mddev->new_layout = mddev->layout; | |
2635 | } | |
2636 | ||
2637 | /* | |
2638 | * Adjust array size: | |
2639 | * | |
2640 | * - in case of adding disks, array size has | |
2641 | * to grow after the disk adding reshape, | |
2642 | * which'll hapen in the event handler; | |
2643 | * reshape will happen forward, so space has to | |
2644 | * be available at the beginning of each disk | |
2645 | * | |
2646 | * - in case of removing disks, array size | |
2647 | * has to shrink before starting the reshape, | |
2648 | * which'll happen here; | |
2649 | * reshape will happen backward, so space has to | |
2650 | * be available at the end of each disk | |
2651 | * | |
2652 | * - data_offset and new_data_offset are | |
ae3c6cff | 2653 | * adjusted for aforementioned out of place |
9dbd1aa3 HM |
2654 | * reshaping based on userspace passing in |
2655 | * the "data_offset <sectors>" key/value | |
ae3c6cff | 2656 | * pair via the constructor |
9dbd1aa3 HM |
2657 | */ |
2658 | ||
2659 | /* Add disk(s) */ | |
2660 | if (rs->delta_disks > 0) { | |
2661 | /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */ | |
2662 | for (d = cur_raid_devs; d < rs->raid_disks; d++) { | |
2663 | rdev = &rs->dev[d].rdev; | |
2664 | clear_bit(In_sync, &rdev->flags); | |
2665 | ||
2666 | /* | |
2667 | * save_raid_disk needs to be -1, or recovery_offset will be set to 0 | |
2668 | * by md, which'll store that erroneously in the superblock on reshape | |
2669 | */ | |
2670 | rdev->saved_raid_disk = -1; | |
2671 | rdev->raid_disk = d; | |
2672 | ||
2673 | rdev->sectors = mddev->dev_sectors; | |
7a7c330f | 2674 | rdev->recovery_offset = rs_is_raid1(rs) ? 0 : MaxSector; |
9dbd1aa3 HM |
2675 | } |
2676 | ||
2677 | mddev->reshape_backwards = 0; /* adding disks -> forward reshape */ | |
2678 | ||
2679 | /* Remove disk(s) */ | |
2680 | } else if (rs->delta_disks < 0) { | |
2681 | r = rs_set_dev_and_array_sectors(rs, true); | |
2682 | mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */ | |
2683 | ||
2684 | /* Change layout and/or chunk size */ | |
2685 | } else { | |
2686 | /* | |
2687 | * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size: | |
2688 | * | |
2689 | * keeping number of disks and do layout change -> | |
2690 | * | |
2691 | * toggle reshape_backward depending on data_offset: | |
2692 | * | |
2693 | * - free space upfront -> reshape forward | |
2694 | * | |
2695 | * - free space at the end -> reshape backward | |
2696 | * | |
2697 | * | |
2698 | * This utilizes free reshape space avoiding the need | |
2699 | * for userspace to move (parts of) LV segments in | |
2700 | * case of layout/chunksize change (for disk | |
2701 | * adding/removing reshape space has to be at | |
2702 | * the proper address (see above with delta_disks): | |
2703 | * | |
2704 | * add disk(s) -> begin | |
2705 | * remove disk(s)-> end | |
2706 | */ | |
2707 | mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1; | |
2708 | } | |
2709 | ||
2710 | return r; | |
2711 | } | |
2712 | ||
75b8e04b | 2713 | /* |
48cf06bc HM |
2714 | * Enable/disable discard support on RAID set depending on |
2715 | * RAID level and discard properties of underlying RAID members. | |
75b8e04b | 2716 | */ |
ecbfb9f1 | 2717 | static void configure_discard_support(struct raid_set *rs) |
75b8e04b | 2718 | { |
48cf06bc HM |
2719 | int i; |
2720 | bool raid456; | |
ecbfb9f1 | 2721 | struct dm_target *ti = rs->ti; |
48cf06bc | 2722 | |
75b8e04b HM |
2723 | /* Assume discards not supported until after checks below. */ |
2724 | ti->discards_supported = false; | |
2725 | ||
2726 | /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */ | |
48cf06bc | 2727 | raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6); |
75b8e04b | 2728 | |
ffeeac75 | 2729 | for (i = 0; i < rs->raid_disks; i++) { |
d20c4b08 | 2730 | struct request_queue *q; |
48cf06bc | 2731 | |
d20c4b08 HM |
2732 | if (!rs->dev[i].rdev.bdev) |
2733 | continue; | |
2734 | ||
2735 | q = bdev_get_queue(rs->dev[i].rdev.bdev); | |
48cf06bc HM |
2736 | if (!q || !blk_queue_discard(q)) |
2737 | return; | |
2738 | ||
2739 | if (raid456) { | |
2740 | if (!q->limits.discard_zeroes_data) | |
2741 | return; | |
2742 | if (!devices_handle_discard_safely) { | |
2743 | DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty."); | |
2744 | DMERR("Set dm-raid.devices_handle_discard_safely=Y to override."); | |
2745 | return; | |
2746 | } | |
2747 | } | |
2748 | } | |
2749 | ||
2750 | /* All RAID members properly support discards */ | |
75b8e04b HM |
2751 | ti->discards_supported = true; |
2752 | ||
2753 | /* | |
2754 | * RAID1 and RAID10 personalities require bio splitting, | |
48cf06bc | 2755 | * RAID0/4/5/6 don't and process large discard bios properly. |
75b8e04b | 2756 | */ |
48cf06bc | 2757 | ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10); |
75b8e04b HM |
2758 | ti->num_discard_bios = 1; |
2759 | } | |
2760 | ||
9d09e663 | 2761 | /* |
73c6f239 | 2762 | * Construct a RAID0/1/10/4/5/6 mapping: |
9d09e663 | 2763 | * Args: |
43157840 MS |
2764 | * <raid_type> <#raid_params> <raid_params>{0,} \ |
2765 | * <#raid_devs> [<meta_dev1> <dev1>]{1,} | |
9d09e663 | 2766 | * |
43157840 | 2767 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
9d09e663 | 2768 | * details on possible <raid_params>. |
73c6f239 HM |
2769 | * |
2770 | * Userspace is free to initialize the metadata devices, hence the superblocks to | |
2771 | * enforce recreation based on the passed in table parameters. | |
2772 | * | |
9d09e663 | 2773 | */ |
094f394d | 2774 | static int raid_ctr(struct dm_target *ti, unsigned int argc, char **argv) |
9d09e663 | 2775 | { |
73c6f239 | 2776 | int r; |
469b304b | 2777 | bool resize; |
9d09e663 | 2778 | struct raid_type *rt; |
094f394d | 2779 | unsigned int num_raid_params, num_raid_devs; |
4dff2f1e | 2780 | sector_t calculated_dev_sectors; |
9d09e663 | 2781 | struct raid_set *rs = NULL; |
92c83d79 | 2782 | const char *arg; |
9dbd1aa3 | 2783 | struct rs_layout rs_layout; |
92c83d79 HM |
2784 | struct dm_arg_set as = { argc, argv }, as_nrd; |
2785 | struct dm_arg _args[] = { | |
2786 | { 0, as.argc, "Cannot understand number of raid parameters" }, | |
2787 | { 1, 254, "Cannot understand number of raid devices parameters" } | |
2788 | }; | |
2789 | ||
2790 | /* Must have <raid_type> */ | |
2791 | arg = dm_shift_arg(&as); | |
bd83a4c4 MS |
2792 | if (!arg) { |
2793 | ti->error = "No arguments"; | |
2794 | return -EINVAL; | |
2795 | } | |
9d09e663 | 2796 | |
92c83d79 | 2797 | rt = get_raid_type(arg); |
bd83a4c4 MS |
2798 | if (!rt) { |
2799 | ti->error = "Unrecognised raid_type"; | |
2800 | return -EINVAL; | |
2801 | } | |
9d09e663 | 2802 | |
92c83d79 HM |
2803 | /* Must have <#raid_params> */ |
2804 | if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error)) | |
43157840 | 2805 | return -EINVAL; |
9d09e663 | 2806 | |
92c83d79 HM |
2807 | /* number of raid device tupples <meta_dev data_dev> */ |
2808 | as_nrd = as; | |
2809 | dm_consume_args(&as_nrd, num_raid_params); | |
2810 | _args[1].max = (as_nrd.argc - 1) / 2; | |
2811 | if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error)) | |
43157840 | 2812 | return -EINVAL; |
9d09e663 | 2813 | |
bb91a63f | 2814 | if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) { |
bd83a4c4 MS |
2815 | ti->error = "Invalid number of supplied raid devices"; |
2816 | return -EINVAL; | |
2817 | } | |
3ca5a21a | 2818 | |
bfcee0e3 | 2819 | rs = raid_set_alloc(ti, rt, num_raid_devs); |
9d09e663 N |
2820 | if (IS_ERR(rs)) |
2821 | return PTR_ERR(rs); | |
2822 | ||
92c83d79 | 2823 | r = parse_raid_params(rs, &as, num_raid_params); |
73c6f239 | 2824 | if (r) |
9d09e663 N |
2825 | goto bad; |
2826 | ||
702108d1 | 2827 | r = parse_dev_params(rs, &as); |
73c6f239 | 2828 | if (r) |
9d09e663 N |
2829 | goto bad; |
2830 | ||
b12d437b | 2831 | rs->md.sync_super = super_sync; |
ecbfb9f1 | 2832 | |
2527b56e HM |
2833 | /* |
2834 | * Calculate ctr requested array and device sizes to allow | |
2835 | * for superblock analysis needing device sizes defined. | |
2836 | * | |
2837 | * Any existing superblock will overwrite the array and device sizes | |
2838 | */ | |
40ba37e5 HM |
2839 | r = rs_set_dev_and_array_sectors(rs, false); |
2840 | if (r) | |
b1956dc4 | 2841 | goto bad; |
40ba37e5 | 2842 | |
4dff2f1e HM |
2843 | calculated_dev_sectors = rs->dev[0].rdev.sectors; |
2844 | ||
ecbfb9f1 HM |
2845 | /* |
2846 | * Backup any new raid set level, layout, ... | |
2847 | * requested to be able to compare to superblock | |
2848 | * members for conversion decisions. | |
2849 | */ | |
9dbd1aa3 | 2850 | rs_config_backup(rs, &rs_layout); |
ecbfb9f1 | 2851 | |
73c6f239 HM |
2852 | r = analyse_superblocks(ti, rs); |
2853 | if (r) | |
b12d437b JB |
2854 | goto bad; |
2855 | ||
2a5556c2 | 2856 | resize = calculated_dev_sectors != rs->dev[0].rdev.sectors; |
4dff2f1e | 2857 | |
9d09e663 | 2858 | INIT_WORK(&rs->md.event_work, do_table_event); |
9d09e663 | 2859 | ti->private = rs; |
55a62eef | 2860 | ti->num_flush_bios = 1; |
9d09e663 | 2861 | |
ecbfb9f1 | 2862 | /* Restore any requested new layout for conversion decision */ |
9dbd1aa3 | 2863 | rs_config_restore(rs, &rs_layout); |
ecbfb9f1 | 2864 | |
469b304b HM |
2865 | /* |
2866 | * Now that we have any superblock metadata available, | |
2867 | * check for new, recovering, reshaping, to be taken over, | |
2868 | * to be reshaped or an existing, unchanged raid set to | |
2869 | * run in sequence. | |
2870 | */ | |
9dbd1aa3 | 2871 | if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) { |
2d92a3c2 HM |
2872 | /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */ |
2873 | if (rs_is_raid6(rs) && | |
2874 | test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) { | |
2875 | ti->error = "'nosync' not allowed for new raid6 set"; | |
b1956dc4 HM |
2876 | r = -EINVAL; |
2877 | goto bad; | |
2d92a3c2 HM |
2878 | } |
2879 | rs_setup_recovery(rs, 0); | |
2a5556c2 HM |
2880 | set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); |
2881 | rs_set_new(rs); | |
2882 | } else if (rs_is_recovering(rs)) { | |
469b304b | 2883 | /* A recovering raid set may be resized */ |
2a5556c2 HM |
2884 | ; /* skip setup rs */ |
2885 | } else if (rs_is_reshaping(rs)) { | |
2886 | /* Have to reject size change request during reshape */ | |
2887 | if (resize) { | |
2888 | ti->error = "Can't resize a reshaping raid set"; | |
b1956dc4 HM |
2889 | r = -EPERM; |
2890 | goto bad; | |
2d92a3c2 | 2891 | } |
469b304b | 2892 | /* skip setup rs */ |
2d92a3c2 | 2893 | } else if (rs_takeover_requested(rs)) { |
9dbd1aa3 HM |
2894 | if (rs_is_reshaping(rs)) { |
2895 | ti->error = "Can't takeover a reshaping raid set"; | |
b1956dc4 HM |
2896 | r = -EPERM; |
2897 | goto bad; | |
9dbd1aa3 HM |
2898 | } |
2899 | ||
2900 | /* | |
2527b56e | 2901 | * If a takeover is needed, userspace sets any additional |
469b304b HM |
2902 | * devices to rebuild and we can check for a valid request here. |
2903 | * | |
2904 | * If acceptible, set the level to the new requested | |
2a5556c2 HM |
2905 | * one, prohibit requesting recovery, allow the raid |
2906 | * set to run and store superblocks during resume. | |
9dbd1aa3 | 2907 | */ |
ecbfb9f1 HM |
2908 | r = rs_check_takeover(rs); |
2909 | if (r) | |
b1956dc4 | 2910 | goto bad; |
ecbfb9f1 HM |
2911 | |
2912 | r = rs_setup_takeover(rs); | |
2913 | if (r) | |
b1956dc4 | 2914 | goto bad; |
ecbfb9f1 | 2915 | |
4286325b | 2916 | set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); |
469b304b | 2917 | /* Takeover ain't recovery, so disable recovery */ |
2a5556c2 | 2918 | rs_setup_recovery(rs, MaxSector); |
3a1c1ef2 | 2919 | rs_set_new(rs); |
40ba37e5 | 2920 | } else if (rs_reshape_requested(rs)) { |
9dbd1aa3 | 2921 | /* |
469b304b HM |
2922 | * We can only prepare for a reshape here, because the |
2923 | * raid set needs to run to provide the repective reshape | |
2924 | * check functions via its MD personality instance. | |
2925 | * | |
2926 | * So do the reshape check after md_run() succeeded. | |
2927 | */ | |
2928 | r = rs_prepare_reshape(rs); | |
2929 | if (r) | |
2930 | return r; | |
9dbd1aa3 | 2931 | |
469b304b | 2932 | /* Reshaping ain't recovery, so disable recovery */ |
4dff2f1e | 2933 | rs_setup_recovery(rs, MaxSector); |
3a1c1ef2 | 2934 | rs_set_cur(rs); |
2a5556c2 HM |
2935 | } else { |
2936 | /* May not set recovery when a device rebuild is requested */ | |
37f10be1 HM |
2937 | if (test_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags)) { |
2938 | rs_setup_recovery(rs, MaxSector); | |
2939 | set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); | |
2940 | } else | |
2941 | rs_setup_recovery(rs, test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) ? | |
2a5556c2 HM |
2942 | 0 : (resize ? calculated_dev_sectors : MaxSector)); |
2943 | rs_set_cur(rs); | |
4dff2f1e | 2944 | } |
ecbfb9f1 | 2945 | |
40ba37e5 HM |
2946 | /* If constructor requested it, change data and new_data offsets */ |
2947 | r = rs_adjust_data_offsets(rs); | |
2948 | if (r) | |
b1956dc4 | 2949 | goto bad; |
40ba37e5 | 2950 | |
ecbfb9f1 HM |
2951 | /* Start raid set read-only and assumed clean to change in raid_resume() */ |
2952 | rs->md.ro = 1; | |
2953 | rs->md.in_sync = 1; | |
2954 | set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); | |
75b8e04b | 2955 | |
0cf45031 HM |
2956 | /* Has to be held on running the array */ |
2957 | mddev_lock_nointr(&rs->md); | |
73c6f239 | 2958 | r = md_run(&rs->md); |
9d09e663 | 2959 | rs->md.in_sync = 0; /* Assume already marked dirty */ |
9d09e663 | 2960 | |
73c6f239 | 2961 | if (r) { |
9dbd1aa3 HM |
2962 | ti->error = "Failed to run raid array"; |
2963 | mddev_unlock(&rs->md); | |
9d09e663 N |
2964 | goto bad; |
2965 | } | |
2966 | ||
2967 | rs->callbacks.congested_fn = raid_is_congested; | |
9d09e663 N |
2968 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
2969 | ||
32737279 | 2970 | mddev_suspend(&rs->md); |
9dbd1aa3 HM |
2971 | |
2972 | /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */ | |
2973 | if (rs_is_raid456(rs)) { | |
2974 | r = rs_set_raid456_stripe_cache(rs); | |
2975 | if (r) | |
2976 | goto bad_stripe_cache; | |
2977 | } | |
2978 | ||
2979 | /* Now do an early reshape check */ | |
2980 | if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) { | |
2981 | r = rs_check_reshape(rs); | |
2982 | if (r) | |
b1956dc4 | 2983 | goto bad_check_reshape; |
9dbd1aa3 HM |
2984 | |
2985 | /* Restore new, ctr requested layout to perform check */ | |
2986 | rs_config_restore(rs, &rs_layout); | |
2987 | ||
7a7c330f HM |
2988 | if (rs->md.pers->start_reshape) { |
2989 | r = rs->md.pers->check_reshape(&rs->md); | |
2990 | if (r) { | |
2991 | ti->error = "Reshape check failed"; | |
2992 | goto bad_check_reshape; | |
2993 | } | |
9dbd1aa3 HM |
2994 | } |
2995 | } | |
2996 | ||
2997 | mddev_unlock(&rs->md); | |
9d09e663 N |
2998 | return 0; |
2999 | ||
9dbd1aa3 HM |
3000 | bad_stripe_cache: |
3001 | bad_check_reshape: | |
63f33b8d | 3002 | md_stop(&rs->md); |
9d09e663 | 3003 | bad: |
bfcee0e3 | 3004 | raid_set_free(rs); |
9d09e663 | 3005 | |
73c6f239 | 3006 | return r; |
9d09e663 N |
3007 | } |
3008 | ||
3009 | static void raid_dtr(struct dm_target *ti) | |
3010 | { | |
3011 | struct raid_set *rs = ti->private; | |
3012 | ||
3013 | list_del_init(&rs->callbacks.list); | |
3014 | md_stop(&rs->md); | |
bfcee0e3 | 3015 | raid_set_free(rs); |
9d09e663 N |
3016 | } |
3017 | ||
7de3ee57 | 3018 | static int raid_map(struct dm_target *ti, struct bio *bio) |
9d09e663 N |
3019 | { |
3020 | struct raid_set *rs = ti->private; | |
fd01b88c | 3021 | struct mddev *mddev = &rs->md; |
9d09e663 | 3022 | |
9dbd1aa3 HM |
3023 | /* |
3024 | * If we're reshaping to add disk(s)), ti->len and | |
3025 | * mddev->array_sectors will differ during the process | |
3026 | * (ti->len > mddev->array_sectors), so we have to requeue | |
3027 | * bios with addresses > mddev->array_sectors here or | |
2527b56e | 3028 | * there will occur accesses past EOD of the component |
9dbd1aa3 HM |
3029 | * data images thus erroring the raid set. |
3030 | */ | |
3031 | if (unlikely(bio_end_sector(bio) > mddev->array_sectors)) | |
3032 | return DM_MAPIO_REQUEUE; | |
3033 | ||
9d09e663 N |
3034 | mddev->pers->make_request(mddev, bio); |
3035 | ||
3036 | return DM_MAPIO_SUBMITTED; | |
3037 | } | |
3038 | ||
3a1c1ef2 | 3039 | /* Return string describing the current sync action of @mddev */ |
be83651f JB |
3040 | static const char *decipher_sync_action(struct mddev *mddev) |
3041 | { | |
3042 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
3043 | return "frozen"; | |
3044 | ||
3045 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
3046 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { | |
3047 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
3048 | return "reshape"; | |
3049 | ||
3050 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
3051 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
3052 | return "resync"; | |
3053 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3054 | return "check"; | |
3055 | return "repair"; | |
3056 | } | |
3057 | ||
3058 | if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) | |
3059 | return "recover"; | |
3060 | } | |
3061 | ||
3062 | return "idle"; | |
3063 | } | |
3064 | ||
3a1c1ef2 HM |
3065 | /* |
3066 | * Return status string @rdev | |
3067 | * | |
3068 | * Status characters: | |
3069 | * | |
3070 | * 'D' = Dead/Failed device | |
3071 | * 'a' = Alive but not in-sync | |
3072 | * 'A' = Alive and in-sync | |
3073 | */ | |
e6ca5e1a | 3074 | static const char *__raid_dev_status(struct md_rdev *rdev, bool array_in_sync) |
9d09e663 | 3075 | { |
3a1c1ef2 HM |
3076 | if (test_bit(Faulty, &rdev->flags)) |
3077 | return "D"; | |
3078 | else if (!array_in_sync || !test_bit(In_sync, &rdev->flags)) | |
3079 | return "a"; | |
3080 | else | |
3081 | return "A"; | |
3082 | } | |
9d09e663 | 3083 | |
3a1c1ef2 HM |
3084 | /* Helper to return resync/reshape progress for @rs and @array_in_sync */ |
3085 | static sector_t rs_get_progress(struct raid_set *rs, | |
3086 | sector_t resync_max_sectors, bool *array_in_sync) | |
3087 | { | |
3088 | sector_t r, recovery_cp, curr_resync_completed; | |
3089 | struct mddev *mddev = &rs->md; | |
9d09e663 | 3090 | |
3a1c1ef2 HM |
3091 | curr_resync_completed = mddev->curr_resync_completed ?: mddev->recovery_cp; |
3092 | recovery_cp = mddev->recovery_cp; | |
3093 | *array_in_sync = false; | |
3094 | ||
3095 | if (rs_is_raid0(rs)) { | |
3096 | r = resync_max_sectors; | |
3097 | *array_in_sync = true; | |
3098 | ||
3099 | } else { | |
3100 | r = mddev->reshape_position; | |
3101 | ||
3102 | /* Reshape is relative to the array size */ | |
3103 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || | |
3104 | r != MaxSector) { | |
3105 | if (r == MaxSector) { | |
3106 | *array_in_sync = true; | |
3107 | r = resync_max_sectors; | |
0cf45031 | 3108 | } else { |
3a1c1ef2 HM |
3109 | /* Got to reverse on backward reshape */ |
3110 | if (mddev->reshape_backwards) | |
3111 | r = mddev->array_sectors - r; | |
3112 | ||
3113 | /* Devide by # of data stripes */ | |
3114 | sector_div(r, mddev_data_stripes(rs)); | |
0cf45031 | 3115 | } |
3a1c1ef2 HM |
3116 | |
3117 | /* Sync is relative to the component device size */ | |
3118 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3119 | r = curr_resync_completed; | |
3120 | else | |
3121 | r = recovery_cp; | |
3122 | ||
3123 | if (r == MaxSector) { | |
3124 | /* | |
3125 | * Sync complete. | |
3126 | */ | |
3127 | *array_in_sync = true; | |
3128 | r = resync_max_sectors; | |
3129 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
3130 | /* | |
3131 | * If "check" or "repair" is occurring, the raid set has | |
3132 | * undergone an initial sync and the health characters | |
3133 | * should not be 'a' anymore. | |
3134 | */ | |
3135 | *array_in_sync = true; | |
0cf45031 | 3136 | } else { |
3a1c1ef2 | 3137 | struct md_rdev *rdev; |
be83651f | 3138 | |
3a1c1ef2 HM |
3139 | /* |
3140 | * The raid set may be doing an initial sync, or it may | |
43157840 | 3141 | * be rebuilding individual components. If all the |
3a1c1ef2 HM |
3142 | * devices are In_sync, then it is the raid set that is |
3143 | * being initialized. | |
3144 | */ | |
3145 | rdev_for_each(rdev, mddev) | |
3146 | if (!test_bit(In_sync, &rdev->flags)) | |
3147 | *array_in_sync = true; | |
3148 | #if 0 | |
3149 | r = 0; /* HM FIXME: TESTME: https://bugzilla.redhat.com/show_bug.cgi?id=1210637 ? */ | |
3150 | #endif | |
2e727c3c | 3151 | } |
3a1c1ef2 HM |
3152 | } |
3153 | ||
3154 | return r; | |
3155 | } | |
3156 | ||
3157 | /* Helper to return @dev name or "-" if !@dev */ | |
e6ca5e1a | 3158 | static const char *__get_dev_name(struct dm_dev *dev) |
3a1c1ef2 HM |
3159 | { |
3160 | return dev ? dev->name : "-"; | |
3161 | } | |
3162 | ||
3163 | static void raid_status(struct dm_target *ti, status_type_t type, | |
3164 | unsigned int status_flags, char *result, unsigned int maxlen) | |
3165 | { | |
3166 | struct raid_set *rs = ti->private; | |
3167 | struct mddev *mddev = &rs->md; | |
3168 | struct r5conf *conf = mddev->private; | |
7a7c330f | 3169 | int i, max_nr_stripes = conf ? conf->max_nr_stripes : 0; |
3a1c1ef2 HM |
3170 | bool array_in_sync; |
3171 | unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */ | |
3172 | unsigned int sz = 0; | |
7a7c330f | 3173 | unsigned int rebuild_disks; |
3a1c1ef2 HM |
3174 | unsigned int write_mostly_params = 0; |
3175 | sector_t progress, resync_max_sectors, resync_mismatches; | |
3176 | const char *sync_action; | |
3177 | struct raid_type *rt; | |
3178 | struct md_rdev *rdev; | |
3179 | ||
3180 | switch (type) { | |
3181 | case STATUSTYPE_INFO: | |
3182 | /* *Should* always succeed */ | |
3183 | rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout); | |
3184 | if (!rt) | |
3185 | return; | |
3186 | ||
9dbd1aa3 | 3187 | DMEMIT("%s %d ", rt->name, mddev->raid_disks); |
3a1c1ef2 HM |
3188 | |
3189 | /* Access most recent mddev properties for status output */ | |
3190 | smp_rmb(); | |
3191 | /* Get sensible max sectors even if raid set not yet started */ | |
4286325b | 3192 | resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ? |
3a1c1ef2 HM |
3193 | mddev->resync_max_sectors : mddev->dev_sectors; |
3194 | progress = rs_get_progress(rs, resync_max_sectors, &array_in_sync); | |
3195 | resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ? | |
9dbd1aa3 | 3196 | atomic64_read(&mddev->resync_mismatches) : 0; |
3a1c1ef2 HM |
3197 | sync_action = decipher_sync_action(&rs->md); |
3198 | ||
3199 | /* HM FIXME: do we want another state char for raid0? It shows 'D' or 'A' now */ | |
32682409 HM |
3200 | rdev_for_each(rdev, mddev) |
3201 | DMEMIT(__raid_dev_status(rdev, array_in_sync)); | |
9d09e663 | 3202 | |
2e727c3c | 3203 | /* |
3a1c1ef2 | 3204 | * In-sync/Reshape ratio: |
2e727c3c | 3205 | * The in-sync ratio shows the progress of: |
3a1c1ef2 HM |
3206 | * - Initializing the raid set |
3207 | * - Rebuilding a subset of devices of the raid set | |
2e727c3c JB |
3208 | * The user can distinguish between the two by referring |
3209 | * to the status characters. | |
3a1c1ef2 HM |
3210 | * |
3211 | * The reshape ratio shows the progress of | |
3212 | * changing the raid layout or the number of | |
3213 | * disks of a raid set | |
2e727c3c | 3214 | */ |
3a1c1ef2 HM |
3215 | DMEMIT(" %llu/%llu", (unsigned long long) progress, |
3216 | (unsigned long long) resync_max_sectors); | |
9d09e663 | 3217 | |
be83651f | 3218 | /* |
3a1c1ef2 HM |
3219 | * v1.5.0+: |
3220 | * | |
be83651f | 3221 | * Sync action: |
3a1c1ef2 | 3222 | * See Documentation/device-mapper/dm-raid.txt for |
be83651f JB |
3223 | * information on each of these states. |
3224 | */ | |
3a1c1ef2 | 3225 | DMEMIT(" %s", sync_action); |
be83651f JB |
3226 | |
3227 | /* | |
3a1c1ef2 HM |
3228 | * v1.5.0+: |
3229 | * | |
be83651f JB |
3230 | * resync_mismatches/mismatch_cnt |
3231 | * This field shows the number of discrepancies found when | |
3a1c1ef2 | 3232 | * performing a "check" of the raid set. |
be83651f | 3233 | */ |
3a1c1ef2 | 3234 | DMEMIT(" %llu", (unsigned long long) resync_mismatches); |
9d09e663 | 3235 | |
3a1c1ef2 | 3236 | /* |
9b6e5423 | 3237 | * v1.9.0+: |
3a1c1ef2 HM |
3238 | * |
3239 | * data_offset (needed for out of space reshaping) | |
3240 | * This field shows the data offset into the data | |
3241 | * image LV where the first stripes data starts. | |
3242 | * | |
3243 | * We keep data_offset equal on all raid disks of the set, | |
3244 | * so retrieving it from the first raid disk is sufficient. | |
3245 | */ | |
3246 | DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset); | |
3247 | break; | |
9d09e663 | 3248 | |
3a1c1ef2 HM |
3249 | case STATUSTYPE_TABLE: |
3250 | /* Report the table line string you would use to construct this raid set */ | |
3251 | ||
3252 | /* Calculate raid parameter count */ | |
7a7c330f HM |
3253 | for (i = 0; i < rs->raid_disks; i++) |
3254 | if (test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
3a1c1ef2 | 3255 | write_mostly_params += 2; |
7a7c330f HM |
3256 | rebuild_disks = memweight(rs->rebuild_disks, DISKS_ARRAY_ELEMS * sizeof(*rs->rebuild_disks)); |
3257 | raid_param_cnt += rebuild_disks * 2 + | |
3a1c1ef2 HM |
3258 | write_mostly_params + |
3259 | hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) + | |
3260 | hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2; | |
3261 | /* Emit table line */ | |
3262 | DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors); | |
4286325b | 3263 | if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) |
3fa6cf38 | 3264 | DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT), |
3a1c1ef2 | 3265 | raid10_md_layout_to_format(mddev->layout)); |
4286325b | 3266 | if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) |
3fa6cf38 | 3267 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES), |
3a1c1ef2 | 3268 | raid10_md_layout_to_copies(mddev->layout)); |
4286325b | 3269 | if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) |
3fa6cf38 | 3270 | DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC)); |
4286325b | 3271 | if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) |
3fa6cf38 | 3272 | DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC)); |
4286325b | 3273 | if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) |
3fa6cf38 | 3274 | DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE), |
3a1c1ef2 | 3275 | (unsigned long long) to_sector(mddev->bitmap_info.chunksize)); |
4286325b | 3276 | if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) |
3fa6cf38 | 3277 | DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET), |
3a1c1ef2 | 3278 | (unsigned long long) rs->data_offset); |
4286325b | 3279 | if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) |
3fa6cf38 | 3280 | DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP), |
3a1c1ef2 | 3281 | mddev->bitmap_info.daemon_sleep); |
4286325b | 3282 | if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) |
3fa6cf38 | 3283 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS), |
7a7c330f | 3284 | max(rs->delta_disks, mddev->delta_disks)); |
4286325b | 3285 | if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) |
3fa6cf38 | 3286 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE), |
3a1c1ef2 | 3287 | max_nr_stripes); |
7a7c330f HM |
3288 | if (rebuild_disks) |
3289 | for (i = 0; i < rs->raid_disks; i++) | |
3290 | if (test_bit(rs->dev[i].rdev.raid_disk, (void *) rs->rebuild_disks)) | |
3291 | DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD), | |
3292 | rs->dev[i].rdev.raid_disk); | |
3293 | if (write_mostly_params) | |
3294 | for (i = 0; i < rs->raid_disks; i++) | |
3295 | if (test_bit(WriteMostly, &rs->dev[i].rdev.flags)) | |
3296 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY), | |
3297 | rs->dev[i].rdev.raid_disk); | |
4286325b | 3298 | if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) |
3fa6cf38 | 3299 | DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND), |
3a1c1ef2 | 3300 | mddev->bitmap_info.max_write_behind); |
4286325b | 3301 | if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) |
3fa6cf38 | 3302 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE), |
3a1c1ef2 | 3303 | mddev->sync_speed_max); |
4286325b | 3304 | if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) |
3fa6cf38 | 3305 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE), |
3a1c1ef2 HM |
3306 | mddev->sync_speed_min); |
3307 | DMEMIT(" %d", rs->raid_disks); | |
7a7c330f HM |
3308 | for (i = 0; i < rs->raid_disks; i++) |
3309 | DMEMIT(" %s %s", __get_dev_name(rs->dev[i].meta_dev), | |
3310 | __get_dev_name(rs->dev[i].data_dev)); | |
9d09e663 | 3311 | } |
9d09e663 N |
3312 | } |
3313 | ||
094f394d | 3314 | static int raid_message(struct dm_target *ti, unsigned int argc, char **argv) |
be83651f JB |
3315 | { |
3316 | struct raid_set *rs = ti->private; | |
3317 | struct mddev *mddev = &rs->md; | |
3318 | ||
be83651f JB |
3319 | if (!mddev->pers || !mddev->pers->sync_request) |
3320 | return -EINVAL; | |
3321 | ||
3322 | if (!strcasecmp(argv[0], "frozen")) | |
3323 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3324 | else | |
3325 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3326 | ||
3327 | if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) { | |
3328 | if (mddev->sync_thread) { | |
3329 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3330 | md_reap_sync_thread(mddev); | |
3331 | } | |
3332 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
3333 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
3334 | return -EBUSY; | |
3335 | else if (!strcasecmp(argv[0], "resync")) | |
3a1c1ef2 HM |
3336 | ; /* MD_RECOVERY_NEEDED set below */ |
3337 | else if (!strcasecmp(argv[0], "recover")) | |
be83651f | 3338 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
3a1c1ef2 | 3339 | else { |
be83651f JB |
3340 | if (!strcasecmp(argv[0], "check")) |
3341 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
3342 | else if (!!strcasecmp(argv[0], "repair")) | |
3343 | return -EINVAL; | |
3344 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3345 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
3346 | } | |
3347 | if (mddev->ro == 2) { | |
3348 | /* A write to sync_action is enough to justify | |
3349 | * canceling read-auto mode | |
3350 | */ | |
3351 | mddev->ro = 0; | |
3a1c1ef2 | 3352 | if (!mddev->suspended && mddev->sync_thread) |
be83651f JB |
3353 | md_wakeup_thread(mddev->sync_thread); |
3354 | } | |
3355 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3a1c1ef2 | 3356 | if (!mddev->suspended && mddev->thread) |
be83651f JB |
3357 | md_wakeup_thread(mddev->thread); |
3358 | ||
3359 | return 0; | |
3360 | } | |
3361 | ||
3362 | static int raid_iterate_devices(struct dm_target *ti, | |
3363 | iterate_devices_callout_fn fn, void *data) | |
9d09e663 N |
3364 | { |
3365 | struct raid_set *rs = ti->private; | |
094f394d | 3366 | unsigned int i; |
73c6f239 | 3367 | int r = 0; |
9d09e663 | 3368 | |
73c6f239 | 3369 | for (i = 0; !r && i < rs->md.raid_disks; i++) |
9d09e663 | 3370 | if (rs->dev[i].data_dev) |
73c6f239 | 3371 | r = fn(ti, |
9d09e663 N |
3372 | rs->dev[i].data_dev, |
3373 | 0, /* No offset on data devs */ | |
3374 | rs->md.dev_sectors, | |
3375 | data); | |
3376 | ||
73c6f239 | 3377 | return r; |
9d09e663 N |
3378 | } |
3379 | ||
3380 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
3381 | { | |
3382 | struct raid_set *rs = ti->private; | |
89d3d9a1 | 3383 | unsigned int chunk_size = to_bytes(rs->md.chunk_sectors); |
9d09e663 N |
3384 | |
3385 | blk_limits_io_min(limits, chunk_size); | |
89d3d9a1 | 3386 | blk_limits_io_opt(limits, chunk_size * mddev_data_stripes(rs)); |
9d09e663 N |
3387 | } |
3388 | ||
3389 | static void raid_presuspend(struct dm_target *ti) | |
3390 | { | |
3391 | struct raid_set *rs = ti->private; | |
3392 | ||
3393 | md_stop_writes(&rs->md); | |
3394 | } | |
3395 | ||
3396 | static void raid_postsuspend(struct dm_target *ti) | |
3397 | { | |
3398 | struct raid_set *rs = ti->private; | |
3399 | ||
31e10a41 HM |
3400 | if (!rs->md.suspended) |
3401 | mddev_suspend(&rs->md); | |
3402 | ||
3403 | rs->md.ro = 1; | |
9d09e663 N |
3404 | } |
3405 | ||
f381e71b | 3406 | static void attempt_restore_of_faulty_devices(struct raid_set *rs) |
9d09e663 | 3407 | { |
9092c02d | 3408 | int i; |
a3c06a38 | 3409 | uint64_t cleared_failed_devices[DISKS_ARRAY_ELEMS]; |
9092c02d | 3410 | unsigned long flags; |
a3c06a38 | 3411 | bool cleared = false; |
9092c02d | 3412 | struct dm_raid_superblock *sb; |
a3c06a38 | 3413 | struct mddev *mddev = &rs->md; |
9092c02d | 3414 | struct md_rdev *r; |
9d09e663 | 3415 | |
a3c06a38 HM |
3416 | /* RAID personalities have to provide hot add/remove methods or we need to bail out. */ |
3417 | if (!mddev->pers || !mddev->pers->hot_add_disk || !mddev->pers->hot_remove_disk) | |
3418 | return; | |
3419 | ||
3420 | memset(cleared_failed_devices, 0, sizeof(cleared_failed_devices)); | |
3421 | ||
f381e71b JB |
3422 | for (i = 0; i < rs->md.raid_disks; i++) { |
3423 | r = &rs->dev[i].rdev; | |
3424 | if (test_bit(Faulty, &r->flags) && r->sb_page && | |
0a7b8188 HM |
3425 | sync_page_io(r, 0, r->sb_size, r->sb_page, |
3426 | REQ_OP_READ, 0, true)) { | |
f381e71b JB |
3427 | DMINFO("Faulty %s device #%d has readable super block." |
3428 | " Attempting to revive it.", | |
3429 | rs->raid_type->name, i); | |
a4dc163a JB |
3430 | |
3431 | /* | |
3432 | * Faulty bit may be set, but sometimes the array can | |
3433 | * be suspended before the personalities can respond | |
3434 | * by removing the device from the array (i.e. calling | |
43157840 | 3435 | * 'hot_remove_disk'). If they haven't yet removed |
a4dc163a JB |
3436 | * the failed device, its 'raid_disk' number will be |
3437 | * '>= 0' - meaning we must call this function | |
3438 | * ourselves. | |
3439 | */ | |
3440 | if ((r->raid_disk >= 0) && | |
a3c06a38 | 3441 | (mddev->pers->hot_remove_disk(mddev, r) != 0)) |
a4dc163a JB |
3442 | /* Failed to revive this device, try next */ |
3443 | continue; | |
3444 | ||
f381e71b JB |
3445 | r->raid_disk = i; |
3446 | r->saved_raid_disk = i; | |
3447 | flags = r->flags; | |
3448 | clear_bit(Faulty, &r->flags); | |
3449 | clear_bit(WriteErrorSeen, &r->flags); | |
3450 | clear_bit(In_sync, &r->flags); | |
a3c06a38 | 3451 | if (mddev->pers->hot_add_disk(mddev, r)) { |
f381e71b JB |
3452 | r->raid_disk = -1; |
3453 | r->saved_raid_disk = -1; | |
3454 | r->flags = flags; | |
3455 | } else { | |
3456 | r->recovery_offset = 0; | |
a3c06a38 HM |
3457 | set_bit(i, (void *) cleared_failed_devices); |
3458 | cleared = true; | |
f381e71b JB |
3459 | } |
3460 | } | |
3461 | } | |
a3c06a38 HM |
3462 | |
3463 | /* If any failed devices could be cleared, update all sbs failed_devices bits */ | |
3464 | if (cleared) { | |
3465 | uint64_t failed_devices[DISKS_ARRAY_ELEMS]; | |
3466 | ||
f381e71b JB |
3467 | rdev_for_each(r, &rs->md) { |
3468 | sb = page_address(r->sb_page); | |
a3c06a38 HM |
3469 | sb_retrieve_failed_devices(sb, failed_devices); |
3470 | ||
3471 | for (i = 0; i < DISKS_ARRAY_ELEMS; i++) | |
3472 | failed_devices[i] &= ~cleared_failed_devices[i]; | |
3473 | ||
3474 | sb_update_failed_devices(sb, failed_devices); | |
f381e71b JB |
3475 | } |
3476 | } | |
3477 | } | |
3478 | ||
e6ca5e1a | 3479 | static int __load_dirty_region_bitmap(struct raid_set *rs) |
ecbfb9f1 HM |
3480 | { |
3481 | int r = 0; | |
3482 | ||
3483 | /* Try loading the bitmap unless "raid0", which does not have one */ | |
3484 | if (!rs_is_raid0(rs) && | |
4286325b | 3485 | !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) { |
ecbfb9f1 HM |
3486 | r = bitmap_load(&rs->md); |
3487 | if (r) | |
3488 | DMERR("Failed to load bitmap"); | |
3489 | } | |
3490 | ||
3491 | return r; | |
3492 | } | |
3493 | ||
6e20902e HM |
3494 | /* Enforce updating all superblocks */ |
3495 | static void rs_update_sbs(struct raid_set *rs) | |
3496 | { | |
3497 | struct mddev *mddev = &rs->md; | |
3498 | int ro = mddev->ro; | |
3499 | ||
3500 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3501 | mddev->ro = 0; | |
3502 | md_update_sb(mddev, 1); | |
3503 | mddev->ro = ro; | |
3504 | } | |
3505 | ||
9dbd1aa3 HM |
3506 | /* |
3507 | * Reshape changes raid algorithm of @rs to new one within personality | |
3508 | * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes | |
3509 | * disks from a raid set thus growing/shrinking it or resizes the set | |
3510 | * | |
3511 | * Call mddev_lock_nointr() before! | |
3512 | */ | |
3513 | static int rs_start_reshape(struct raid_set *rs) | |
3514 | { | |
3515 | int r; | |
3516 | struct mddev *mddev = &rs->md; | |
3517 | struct md_personality *pers = mddev->pers; | |
3518 | ||
3519 | r = rs_setup_reshape(rs); | |
3520 | if (r) | |
3521 | return r; | |
3522 | ||
3523 | /* Need to be resumed to be able to start reshape, recovery is frozen until raid_resume() though */ | |
3524 | if (mddev->suspended) | |
3525 | mddev_resume(mddev); | |
3526 | ||
3527 | /* | |
3528 | * Check any reshape constraints enforced by the personalility | |
3529 | * | |
3530 | * May as well already kick the reshape off so that * pers->start_reshape() becomes optional. | |
3531 | */ | |
3532 | r = pers->check_reshape(mddev); | |
3533 | if (r) { | |
3534 | rs->ti->error = "pers->check_reshape() failed"; | |
3535 | return r; | |
3536 | } | |
3537 | ||
3538 | /* | |
3539 | * Personality may not provide start reshape method in which | |
3540 | * case check_reshape above has already covered everything | |
3541 | */ | |
3542 | if (pers->start_reshape) { | |
3543 | r = pers->start_reshape(mddev); | |
3544 | if (r) { | |
3545 | rs->ti->error = "pers->start_reshape() failed"; | |
3546 | return r; | |
3547 | } | |
3548 | } | |
3549 | ||
3550 | /* Suspend because a resume will happen in raid_resume() */ | |
3551 | if (!mddev->suspended) | |
3552 | mddev_suspend(mddev); | |
3553 | ||
6e20902e HM |
3554 | /* |
3555 | * Now reshape got set up, update superblocks to | |
3556 | * reflect the fact so that a table reload will | |
3557 | * access proper superblock content in the ctr. | |
3558 | */ | |
3559 | rs_update_sbs(rs); | |
9dbd1aa3 HM |
3560 | |
3561 | return 0; | |
3562 | } | |
3563 | ||
ecbfb9f1 HM |
3564 | static int raid_preresume(struct dm_target *ti) |
3565 | { | |
9dbd1aa3 | 3566 | int r; |
ecbfb9f1 HM |
3567 | struct raid_set *rs = ti->private; |
3568 | struct mddev *mddev = &rs->md; | |
3569 | ||
3570 | /* This is a resume after a suspend of the set -> it's already started */ | |
4286325b | 3571 | if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags)) |
ecbfb9f1 HM |
3572 | return 0; |
3573 | ||
3574 | /* | |
3575 | * The superblocks need to be updated on disk if the | |
6e20902e HM |
3576 | * array is new or new devices got added (thus zeroed |
3577 | * out by userspace) or __load_dirty_region_bitmap | |
3578 | * will overwrite them in core with old data or fail. | |
ecbfb9f1 | 3579 | */ |
6e20902e HM |
3580 | if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags)) |
3581 | rs_update_sbs(rs); | |
ecbfb9f1 HM |
3582 | |
3583 | /* | |
3584 | * Disable/enable discard support on raid set after any | |
3585 | * conversion, because devices can have been added | |
3586 | */ | |
3587 | configure_discard_support(rs); | |
3588 | ||
3589 | /* Load the bitmap from disk unless raid0 */ | |
9dbd1aa3 HM |
3590 | r = __load_dirty_region_bitmap(rs); |
3591 | if (r) | |
3592 | return r; | |
3593 | ||
4257e085 HM |
3594 | /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) */ |
3595 | if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) && | |
3596 | mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)) { | |
3597 | r = bitmap_resize(mddev->bitmap, mddev->dev_sectors, | |
3598 | to_bytes(rs->requested_bitmap_chunk_sectors), 0); | |
3599 | if (r) | |
3600 | DMERR("Failed to resize bitmap"); | |
3601 | } | |
3602 | ||
9dbd1aa3 HM |
3603 | /* Check for any resize/reshape on @rs and adjust/initiate */ |
3604 | /* Be prepared for mddev_resume() in raid_resume() */ | |
3605 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3606 | if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) { | |
9dbd1aa3 HM |
3607 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
3608 | mddev->resync_min = mddev->recovery_cp; | |
3609 | } | |
3610 | ||
3611 | rs_set_capacity(rs); | |
3612 | ||
345a6cdc | 3613 | /* Check for any reshape request unless new raid set */ |
9dbd1aa3 HM |
3614 | if (test_and_clear_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) { |
3615 | /* Initiate a reshape. */ | |
3616 | mddev_lock_nointr(mddev); | |
3617 | r = rs_start_reshape(rs); | |
3618 | mddev_unlock(mddev); | |
3619 | if (r) | |
3620 | DMWARN("Failed to check/start reshape, continuing without change"); | |
3621 | r = 0; | |
3622 | } | |
3623 | ||
3624 | return r; | |
ecbfb9f1 HM |
3625 | } |
3626 | ||
f381e71b JB |
3627 | static void raid_resume(struct dm_target *ti) |
3628 | { | |
3629 | struct raid_set *rs = ti->private; | |
ecbfb9f1 | 3630 | struct mddev *mddev = &rs->md; |
f381e71b | 3631 | |
4286325b | 3632 | if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) { |
ecbfb9f1 HM |
3633 | /* |
3634 | * A secondary resume while the device is active. | |
3635 | * Take this opportunity to check whether any failed | |
3636 | * devices are reachable again. | |
3637 | */ | |
3638 | attempt_restore_of_faulty_devices(rs); | |
31e10a41 | 3639 | } |
34f8ac6d | 3640 | |
31e10a41 HM |
3641 | mddev->ro = 0; |
3642 | mddev->in_sync = 0; | |
3a1c1ef2 | 3643 | |
31e10a41 HM |
3644 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
3645 | ||
3646 | if (mddev->suspended) | |
3647 | mddev_resume(mddev); | |
9d09e663 N |
3648 | } |
3649 | ||
3650 | static struct target_type raid_target = { | |
3651 | .name = "raid", | |
b052b07c | 3652 | .version = {1, 9, 1}, |
9d09e663 N |
3653 | .module = THIS_MODULE, |
3654 | .ctr = raid_ctr, | |
3655 | .dtr = raid_dtr, | |
3656 | .map = raid_map, | |
3657 | .status = raid_status, | |
be83651f | 3658 | .message = raid_message, |
9d09e663 N |
3659 | .iterate_devices = raid_iterate_devices, |
3660 | .io_hints = raid_io_hints, | |
3661 | .presuspend = raid_presuspend, | |
3662 | .postsuspend = raid_postsuspend, | |
ecbfb9f1 | 3663 | .preresume = raid_preresume, |
9d09e663 N |
3664 | .resume = raid_resume, |
3665 | }; | |
3666 | ||
3667 | static int __init dm_raid_init(void) | |
3668 | { | |
fe5d2f4a JB |
3669 | DMINFO("Loading target version %u.%u.%u", |
3670 | raid_target.version[0], | |
3671 | raid_target.version[1], | |
3672 | raid_target.version[2]); | |
9d09e663 N |
3673 | return dm_register_target(&raid_target); |
3674 | } | |
3675 | ||
3676 | static void __exit dm_raid_exit(void) | |
3677 | { | |
3678 | dm_unregister_target(&raid_target); | |
3679 | } | |
3680 | ||
3681 | module_init(dm_raid_init); | |
3682 | module_exit(dm_raid_exit); | |
3683 | ||
48cf06bc HM |
3684 | module_param(devices_handle_discard_safely, bool, 0644); |
3685 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
3686 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
3687 | ||
ef9b85a6 MS |
3688 | MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target"); |
3689 | MODULE_ALIAS("dm-raid0"); | |
63f33b8d JB |
3690 | MODULE_ALIAS("dm-raid1"); |
3691 | MODULE_ALIAS("dm-raid10"); | |
9d09e663 N |
3692 | MODULE_ALIAS("dm-raid4"); |
3693 | MODULE_ALIAS("dm-raid5"); | |
3694 | MODULE_ALIAS("dm-raid6"); | |
3695 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); | |
3a1c1ef2 | 3696 | MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>"); |
9d09e663 | 3697 | MODULE_LICENSE("GPL"); |