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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 | |
48cf06bc HM |
22 | static bool devices_handle_discard_safely = false; |
23 | ||
9d09e663 | 24 | /* |
b12d437b JB |
25 | * The following flags are used by dm-raid.c to set up the array state. |
26 | * They must be cleared before md_run is called. | |
9d09e663 | 27 | */ |
43157840 | 28 | #define FirstUse 10 /* rdev flag */ |
9d09e663 N |
29 | |
30 | struct raid_dev { | |
31 | /* | |
32 | * Two DM devices, one to hold metadata and one to hold the | |
43157840 | 33 | * actual data/parity. The reason for this is to not confuse |
9d09e663 N |
34 | * ti->len and give more flexibility in altering size and |
35 | * characteristics. | |
36 | * | |
37 | * While it is possible for this device to be associated | |
38 | * with a different physical device than the data_dev, it | |
39 | * is intended for it to be the same. | |
40 | * |--------- Physical Device ---------| | |
41 | * |- meta_dev -|------ data_dev ------| | |
42 | */ | |
43 | struct dm_dev *meta_dev; | |
44 | struct dm_dev *data_dev; | |
3cb03002 | 45 | struct md_rdev rdev; |
9d09e663 N |
46 | }; |
47 | ||
48 | /* | |
4286325b | 49 | * Bits for establishing rs->ctr_flags |
702108d1 HM |
50 | * |
51 | * 1 = no flag value | |
52 | * 2 = flag with value | |
9d09e663 | 53 | */ |
4286325b MS |
54 | #define __CTR_FLAG_SYNC 0 /* 1 */ /* Not with raid0! */ |
55 | #define __CTR_FLAG_NOSYNC 1 /* 1 */ /* Not with raid0! */ | |
56 | #define __CTR_FLAG_REBUILD 2 /* 2 */ /* Not with raid0! */ | |
57 | #define __CTR_FLAG_DAEMON_SLEEP 3 /* 2 */ /* Not with raid0! */ | |
58 | #define __CTR_FLAG_MIN_RECOVERY_RATE 4 /* 2 */ /* Not with raid0! */ | |
59 | #define __CTR_FLAG_MAX_RECOVERY_RATE 5 /* 2 */ /* Not with raid0! */ | |
60 | #define __CTR_FLAG_MAX_WRITE_BEHIND 6 /* 2 */ /* Only with raid1! */ | |
61 | #define __CTR_FLAG_WRITE_MOSTLY 7 /* 2 */ /* Only with raid1! */ | |
62 | #define __CTR_FLAG_STRIPE_CACHE 8 /* 2 */ /* Only with raid4/5/6! */ | |
63 | #define __CTR_FLAG_REGION_SIZE 9 /* 2 */ /* Not with raid0! */ | |
64 | #define __CTR_FLAG_RAID10_COPIES 10 /* 2 */ /* Only with raid10 */ | |
65 | #define __CTR_FLAG_RAID10_FORMAT 11 /* 2 */ /* Only with raid10 */ | |
9b6e5423 | 66 | /* New for v1.9.0 */ |
4286325b MS |
67 | #define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid4/5/6/10! */ |
68 | #define __CTR_FLAG_DATA_OFFSET 13 /* 2 */ /* Only with reshapable raid4/5/6/10! */ | |
69 | #define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */ | |
70 | ||
71 | /* | |
72 | * Flags for rs->ctr_flags field. | |
73 | */ | |
74 | #define CTR_FLAG_SYNC (1 << __CTR_FLAG_SYNC) | |
75 | #define CTR_FLAG_NOSYNC (1 << __CTR_FLAG_NOSYNC) | |
76 | #define CTR_FLAG_REBUILD (1 << __CTR_FLAG_REBUILD) | |
77 | #define CTR_FLAG_DAEMON_SLEEP (1 << __CTR_FLAG_DAEMON_SLEEP) | |
78 | #define CTR_FLAG_MIN_RECOVERY_RATE (1 << __CTR_FLAG_MIN_RECOVERY_RATE) | |
79 | #define CTR_FLAG_MAX_RECOVERY_RATE (1 << __CTR_FLAG_MAX_RECOVERY_RATE) | |
80 | #define CTR_FLAG_MAX_WRITE_BEHIND (1 << __CTR_FLAG_MAX_WRITE_BEHIND) | |
81 | #define CTR_FLAG_WRITE_MOSTLY (1 << __CTR_FLAG_WRITE_MOSTLY) | |
82 | #define CTR_FLAG_STRIPE_CACHE (1 << __CTR_FLAG_STRIPE_CACHE) | |
83 | #define CTR_FLAG_REGION_SIZE (1 << __CTR_FLAG_REGION_SIZE) | |
84 | #define CTR_FLAG_RAID10_COPIES (1 << __CTR_FLAG_RAID10_COPIES) | |
85 | #define CTR_FLAG_RAID10_FORMAT (1 << __CTR_FLAG_RAID10_FORMAT) | |
86 | #define CTR_FLAG_DELTA_DISKS (1 << __CTR_FLAG_DELTA_DISKS) | |
87 | #define CTR_FLAG_DATA_OFFSET (1 << __CTR_FLAG_DATA_OFFSET) | |
88 | #define CTR_FLAG_RAID10_USE_NEAR_SETS (1 << __CTR_FLAG_RAID10_USE_NEAR_SETS) | |
63f33b8d | 89 | |
f090279e HM |
90 | /* |
91 | * Definitions of various constructor flags to | |
92 | * be used in checks of valid / invalid flags | |
93 | * per raid level. | |
94 | */ | |
95 | /* Define all any sync flags */ | |
96 | #define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC) | |
97 | ||
98 | /* Define flags for options without argument (e.g. 'nosync') */ | |
33e53f06 HM |
99 | #define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \ |
100 | CTR_FLAG_RAID10_USE_NEAR_SETS) | |
f090279e HM |
101 | |
102 | /* Define flags for options with one argument (e.g. 'delta_disks +2') */ | |
103 | #define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \ | |
104 | CTR_FLAG_WRITE_MOSTLY | \ | |
105 | CTR_FLAG_DAEMON_SLEEP | \ | |
106 | CTR_FLAG_MIN_RECOVERY_RATE | \ | |
107 | CTR_FLAG_MAX_RECOVERY_RATE | \ | |
108 | CTR_FLAG_MAX_WRITE_BEHIND | \ | |
109 | CTR_FLAG_STRIPE_CACHE | \ | |
110 | CTR_FLAG_REGION_SIZE | \ | |
111 | CTR_FLAG_RAID10_COPIES | \ | |
33e53f06 HM |
112 | CTR_FLAG_RAID10_FORMAT | \ |
113 | CTR_FLAG_DELTA_DISKS | \ | |
114 | CTR_FLAG_DATA_OFFSET) | |
f090279e HM |
115 | |
116 | /* All ctr optional arguments */ | |
117 | #define ALL_CTR_FLAGS (CTR_FLAG_OPTIONS_NO_ARGS | \ | |
118 | CTR_FLAG_OPTIONS_ONE_ARG) | |
119 | ||
120 | /* Invalid options definitions per raid level... */ | |
121 | ||
122 | /* "raid0" does not accept any options */ | |
123 | #define RAID0_INVALID_FLAGS ALL_CTR_FLAGS | |
124 | ||
125 | /* "raid1" does not accept stripe cache or any raid10 options */ | |
126 | #define RAID1_INVALID_FLAGS (CTR_FLAG_STRIPE_CACHE | \ | |
127 | CTR_FLAG_RAID10_COPIES | \ | |
33e53f06 HM |
128 | CTR_FLAG_RAID10_FORMAT | \ |
129 | CTR_FLAG_DELTA_DISKS | \ | |
130 | CTR_FLAG_DATA_OFFSET) | |
f090279e HM |
131 | |
132 | /* "raid10" does not accept any raid1 or stripe cache options */ | |
133 | #define RAID10_INVALID_FLAGS (CTR_FLAG_WRITE_MOSTLY | \ | |
134 | CTR_FLAG_MAX_WRITE_BEHIND | \ | |
135 | CTR_FLAG_STRIPE_CACHE) | |
136 | /* | |
137 | * "raid4/5/6" do not accept any raid1 or raid10 specific options | |
138 | * | |
139 | * "raid6" does not accept "nosync", because it is not guaranteed | |
140 | * that both parity and q-syndrome are being written properly with | |
141 | * any writes | |
142 | */ | |
143 | #define RAID45_INVALID_FLAGS (CTR_FLAG_WRITE_MOSTLY | \ | |
144 | CTR_FLAG_MAX_WRITE_BEHIND | \ | |
145 | CTR_FLAG_RAID10_FORMAT | \ | |
33e53f06 HM |
146 | CTR_FLAG_RAID10_COPIES | \ |
147 | CTR_FLAG_RAID10_USE_NEAR_SETS) | |
f090279e HM |
148 | #define RAID6_INVALID_FLAGS (CTR_FLAG_NOSYNC | RAID45_INVALID_FLAGS) |
149 | /* ...invalid options definitions per raid level */ | |
150 | ||
ecbfb9f1 HM |
151 | /* |
152 | * Flags for rs->runtime_flags field | |
153 | * (RT_FLAG prefix meaning "runtime flag") | |
154 | * | |
155 | * These are all internal and used to define runtime state, | |
156 | * e.g. to prevent another resume from preresume processing | |
157 | * the raid set all over again. | |
158 | */ | |
159 | #define RT_FLAG_RS_PRERESUMED 0x1 | |
160 | #define RT_FLAG_RS_RESUMED 0x2 | |
161 | #define RT_FLAG_RS_BITMAP_LOADED 0x4 | |
162 | #define RT_FLAG_UPDATE_SBS 0x8 | |
163 | ||
33e53f06 HM |
164 | /* Array elements of 64 bit needed for rebuild/write_mostly bits */ |
165 | #define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8) | |
166 | ||
ecbfb9f1 HM |
167 | /* |
168 | * raid set level, layout and chunk sectors backup/restore | |
169 | */ | |
170 | struct rs_layout { | |
171 | int new_level; | |
172 | int new_layout; | |
173 | int new_chunk_sectors; | |
174 | }; | |
175 | ||
9d09e663 N |
176 | struct raid_set { |
177 | struct dm_target *ti; | |
178 | ||
34f8ac6d | 179 | uint32_t bitmap_loaded; |
4286325b MS |
180 | unsigned long ctr_flags; |
181 | unsigned long runtime_flags; | |
ecbfb9f1 HM |
182 | |
183 | uint64_t rebuild_disks[DISKS_ARRAY_ELEMS]; | |
9d09e663 | 184 | |
33e53f06 HM |
185 | int raid_disks; |
186 | int delta_disks; | |
4763e543 | 187 | int data_offset; |
33e53f06 HM |
188 | int raid10_copies; |
189 | ||
fd01b88c | 190 | struct mddev md; |
9d09e663 N |
191 | struct raid_type *raid_type; |
192 | struct dm_target_callbacks callbacks; | |
ecbfb9f1 | 193 | struct rs_layout rs_layout; |
9d09e663 N |
194 | |
195 | struct raid_dev dev[0]; | |
196 | }; | |
197 | ||
e6ca5e1a | 198 | static void rs_config_backup(struct raid_set *rs) |
ecbfb9f1 HM |
199 | { |
200 | struct mddev *mddev = &rs->md; | |
e6ca5e1a | 201 | struct rs_layout *l = &rs->rs_layout; |
ecbfb9f1 HM |
202 | |
203 | l->new_level = mddev->new_level; | |
204 | l->new_layout = mddev->new_layout; | |
205 | l->new_chunk_sectors = mddev->new_chunk_sectors; | |
206 | } | |
207 | ||
e6ca5e1a | 208 | static void rs_config_restore(struct raid_set *rs) |
ecbfb9f1 HM |
209 | { |
210 | struct mddev *mddev = &rs->md; | |
e6ca5e1a | 211 | struct rs_layout *l = &rs->rs_layout; |
ecbfb9f1 HM |
212 | |
213 | mddev->new_level = l->new_level; | |
214 | mddev->new_layout = l->new_layout; | |
215 | mddev->new_chunk_sectors = l->new_chunk_sectors; | |
216 | } | |
217 | ||
33e53f06 HM |
218 | /* raid10 algorithms (i.e. formats) */ |
219 | #define ALGORITHM_RAID10_DEFAULT 0 | |
220 | #define ALGORITHM_RAID10_NEAR 1 | |
221 | #define ALGORITHM_RAID10_OFFSET 2 | |
222 | #define ALGORITHM_RAID10_FAR 3 | |
223 | ||
9d09e663 N |
224 | /* Supported raid types and properties. */ |
225 | static struct raid_type { | |
226 | const char *name; /* RAID algorithm. */ | |
227 | const char *descr; /* Descriptor text for logging. */ | |
228 | const unsigned parity_devs; /* # of parity devices. */ | |
229 | const unsigned minimal_devs; /* minimal # of devices in set. */ | |
230 | const unsigned level; /* RAID level. */ | |
231 | const unsigned algorithm; /* RAID algorithm. */ | |
232 | } raid_types[] = { | |
43157840 MS |
233 | {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */}, |
234 | {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */}, | |
235 | {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR}, | |
33e53f06 | 236 | {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET}, |
43157840 MS |
237 | {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR}, |
238 | {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT}, | |
239 | {"raid4", "raid4 (dedicated last parity disk)", 1, 2, 4, ALGORITHM_PARITY_N}, /* raid4 layout = raid5_n */ | |
240 | {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N}, | |
241 | {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC}, | |
242 | {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC}, | |
243 | {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC}, | |
244 | {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC}, | |
245 | {"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART}, | |
246 | {"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART}, | |
247 | {"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE}, | |
248 | {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6}, | |
249 | {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6}, | |
250 | {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6}, | |
251 | {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6}, | |
252 | {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6} | |
9d09e663 N |
253 | }; |
254 | ||
92c83d79 | 255 | /* True, if @v is in inclusive range [@min, @max] */ |
bb91a63f | 256 | static bool __within_range(long v, long min, long max) |
92c83d79 HM |
257 | { |
258 | return v >= min && v <= max; | |
259 | } | |
260 | ||
702108d1 HM |
261 | /* All table line arguments are defined here */ |
262 | static struct arg_name_flag { | |
4286325b | 263 | const unsigned long flag; |
702108d1 | 264 | const char *name; |
e6ca5e1a | 265 | } __arg_name_flags[] = { |
702108d1 HM |
266 | { CTR_FLAG_SYNC, "sync"}, |
267 | { CTR_FLAG_NOSYNC, "nosync"}, | |
268 | { CTR_FLAG_REBUILD, "rebuild"}, | |
269 | { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"}, | |
270 | { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"}, | |
271 | { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"}, | |
272 | { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"}, | |
273 | { CTR_FLAG_WRITE_MOSTLY, "writemostly"}, | |
274 | { CTR_FLAG_STRIPE_CACHE, "stripe_cache"}, | |
275 | { CTR_FLAG_REGION_SIZE, "region_size"}, | |
276 | { CTR_FLAG_RAID10_COPIES, "raid10_copies"}, | |
277 | { CTR_FLAG_RAID10_FORMAT, "raid10_format"}, | |
4763e543 HM |
278 | { CTR_FLAG_DATA_OFFSET, "data_offset"}, |
279 | { CTR_FLAG_DELTA_DISKS, "delta_disks"}, | |
280 | { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"}, | |
702108d1 HM |
281 | }; |
282 | ||
283 | /* Return argument name string for given @flag */ | |
3fa6cf38 | 284 | static const char *dm_raid_arg_name_by_flag(const uint32_t flag) |
702108d1 HM |
285 | { |
286 | if (hweight32(flag) == 1) { | |
e6ca5e1a | 287 | struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags); |
702108d1 | 288 | |
e6ca5e1a | 289 | while (anf-- > __arg_name_flags) |
4286325b | 290 | if (flag & anf->flag) |
702108d1 HM |
291 | return anf->name; |
292 | ||
293 | } else | |
294 | DMERR("%s called with more than one flag!", __func__); | |
295 | ||
296 | return NULL; | |
297 | } | |
298 | ||
33e53f06 HM |
299 | /* |
300 | * bool helpers to test for various raid levels of a raid set, | |
301 | * is. it's level as reported by the superblock rather than | |
302 | * the requested raid_type passed to the constructor. | |
303 | */ | |
304 | /* Return true, if raid set in @rs is raid0 */ | |
305 | static bool rs_is_raid0(struct raid_set *rs) | |
306 | { | |
307 | return !rs->md.level; | |
308 | } | |
309 | ||
310 | /* Return true, if raid set in @rs is raid10 */ | |
311 | static bool rs_is_raid10(struct raid_set *rs) | |
312 | { | |
313 | return rs->md.level == 10; | |
314 | } | |
315 | ||
f090279e HM |
316 | /* |
317 | * bool helpers to test for various raid levels of a raid type | |
318 | */ | |
319 | ||
320 | /* Return true, if raid type in @rt is raid0 */ | |
321 | static bool rt_is_raid0(struct raid_type *rt) | |
322 | { | |
323 | return !rt->level; | |
324 | } | |
325 | ||
326 | /* Return true, if raid type in @rt is raid1 */ | |
327 | static bool rt_is_raid1(struct raid_type *rt) | |
328 | { | |
329 | return rt->level == 1; | |
330 | } | |
331 | ||
332 | /* Return true, if raid type in @rt is raid10 */ | |
333 | static bool rt_is_raid10(struct raid_type *rt) | |
334 | { | |
335 | return rt->level == 10; | |
336 | } | |
337 | ||
338 | /* Return true, if raid type in @rt is raid4/5 */ | |
339 | static bool rt_is_raid45(struct raid_type *rt) | |
340 | { | |
bb91a63f | 341 | return __within_range(rt->level, 4, 5); |
f090279e HM |
342 | } |
343 | ||
344 | /* Return true, if raid type in @rt is raid6 */ | |
345 | static bool rt_is_raid6(struct raid_type *rt) | |
346 | { | |
347 | return rt->level == 6; | |
348 | } | |
676fa5ad HM |
349 | |
350 | /* Return true, if raid type in @rt is raid4/5/6 */ | |
351 | static bool rt_is_raid456(struct raid_type *rt) | |
352 | { | |
bb91a63f | 353 | return __within_range(rt->level, 4, 6); |
676fa5ad | 354 | } |
f090279e HM |
355 | /* END: raid level bools */ |
356 | ||
f090279e | 357 | /* Return invalid ctr flags for the raid level of @rs */ |
e6ca5e1a | 358 | static uint32_t __invalid_flags(struct raid_set *rs) |
f090279e HM |
359 | { |
360 | if (rt_is_raid0(rs->raid_type)) | |
361 | return RAID0_INVALID_FLAGS; | |
362 | else if (rt_is_raid1(rs->raid_type)) | |
363 | return RAID1_INVALID_FLAGS; | |
364 | else if (rt_is_raid10(rs->raid_type)) | |
365 | return RAID10_INVALID_FLAGS; | |
366 | else if (rt_is_raid45(rs->raid_type)) | |
367 | return RAID45_INVALID_FLAGS; | |
368 | else if (rt_is_raid6(rs->raid_type)) | |
369 | return RAID6_INVALID_FLAGS; | |
370 | ||
371 | return ~0; | |
372 | } | |
373 | ||
374 | /* | |
375 | * Check for any invalid flags set on @rs defined by bitset @invalid_flags | |
376 | * | |
377 | * Has to be called after parsing of the ctr flags! | |
378 | */ | |
379 | static int rs_check_for_invalid_flags(struct raid_set *rs) | |
380 | { | |
e6ca5e1a | 381 | if (rs->ctr_flags & __invalid_flags(rs)) { |
4286325b | 382 | rs->ti->error = "Invalid flags combination"; |
bd83a4c4 MS |
383 | return -EINVAL; |
384 | } | |
f090279e HM |
385 | |
386 | return 0; | |
387 | } | |
388 | ||
33e53f06 HM |
389 | /* MD raid10 bit definitions and helpers */ |
390 | #define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */ | |
391 | #define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */ | |
392 | #define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */ | |
393 | #define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */ | |
394 | ||
395 | /* Return md raid10 near copies for @layout */ | |
e6ca5e1a | 396 | static unsigned int __raid10_near_copies(int layout) |
33e53f06 HM |
397 | { |
398 | return layout & 0xFF; | |
399 | } | |
400 | ||
401 | /* Return md raid10 far copies for @layout */ | |
e6ca5e1a | 402 | static unsigned int __raid10_far_copies(int layout) |
33e53f06 | 403 | { |
e6ca5e1a | 404 | return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT); |
33e53f06 HM |
405 | } |
406 | ||
407 | /* Return true if md raid10 offset for @layout */ | |
e6ca5e1a | 408 | static unsigned int __is_raid10_offset(int layout) |
33e53f06 HM |
409 | { |
410 | return layout & RAID10_OFFSET; | |
411 | } | |
412 | ||
413 | /* Return true if md raid10 near for @layout */ | |
e6ca5e1a | 414 | static unsigned int __is_raid10_near(int layout) |
33e53f06 | 415 | { |
e6ca5e1a | 416 | return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1; |
33e53f06 HM |
417 | } |
418 | ||
419 | /* Return true if md raid10 far for @layout */ | |
e6ca5e1a | 420 | static unsigned int __is_raid10_far(int layout) |
33e53f06 | 421 | { |
e6ca5e1a | 422 | return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1; |
33e53f06 HM |
423 | } |
424 | ||
425 | /* Return md raid10 layout string for @layout */ | |
426 | static const char *raid10_md_layout_to_format(int layout) | |
fe5d2f4a JB |
427 | { |
428 | /* | |
33e53f06 HM |
429 | * Bit 16 stands for "offset" |
430 | * (i.e. adjacent stripes hold copies) | |
431 | * | |
fe5d2f4a JB |
432 | * Refer to MD's raid10.c for details |
433 | */ | |
e6ca5e1a | 434 | if (__is_raid10_offset(layout)) |
fe5d2f4a JB |
435 | return "offset"; |
436 | ||
e6ca5e1a | 437 | if (__raid10_near_copies(layout) > 1) |
fe5d2f4a JB |
438 | return "near"; |
439 | ||
e6ca5e1a | 440 | WARN_ON(__raid10_far_copies(layout) < 2); |
33e53f06 | 441 | |
fe5d2f4a JB |
442 | return "far"; |
443 | } | |
444 | ||
33e53f06 HM |
445 | /* Return md raid10 algorithm for @name */ |
446 | static const int raid10_name_to_format(const char *name) | |
447 | { | |
448 | if (!strcasecmp(name, "near")) | |
449 | return ALGORITHM_RAID10_NEAR; | |
450 | else if (!strcasecmp(name, "offset")) | |
451 | return ALGORITHM_RAID10_OFFSET; | |
452 | else if (!strcasecmp(name, "far")) | |
453 | return ALGORITHM_RAID10_FAR; | |
454 | ||
455 | return -EINVAL; | |
456 | } | |
457 | ||
33e53f06 HM |
458 | /* Return md raid10 copies for @layout */ |
459 | static unsigned int raid10_md_layout_to_copies(int layout) | |
63f33b8d | 460 | { |
e6ca5e1a MS |
461 | return __raid10_near_copies(layout) > 1 ? |
462 | __raid10_near_copies(layout) : __raid10_far_copies(layout); | |
63f33b8d JB |
463 | } |
464 | ||
33e53f06 HM |
465 | /* Return md raid10 format id for @format string */ |
466 | static int raid10_format_to_md_layout(struct raid_set *rs, | |
467 | unsigned int algorithm, | |
468 | unsigned int copies) | |
63f33b8d | 469 | { |
33e53f06 | 470 | unsigned int n = 1, f = 1, r = 0; |
fe5d2f4a | 471 | |
33e53f06 HM |
472 | /* |
473 | * MD resilienece flaw: | |
474 | * | |
475 | * enabling use_far_sets for far/offset formats causes copies | |
476 | * to be colocated on the same devs together with their origins! | |
477 | * | |
478 | * -> disable it for now in the definition above | |
479 | */ | |
480 | if (algorithm == ALGORITHM_RAID10_DEFAULT || | |
481 | algorithm == ALGORITHM_RAID10_NEAR) | |
fe5d2f4a | 482 | n = copies; |
33e53f06 HM |
483 | |
484 | else if (algorithm == ALGORITHM_RAID10_OFFSET) { | |
485 | f = copies; | |
486 | r = RAID10_OFFSET; | |
4286325b | 487 | if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) |
33e53f06 HM |
488 | r |= RAID10_USE_FAR_SETS; |
489 | ||
490 | } else if (algorithm == ALGORITHM_RAID10_FAR) { | |
fe5d2f4a | 491 | f = copies; |
33e53f06 | 492 | r = !RAID10_OFFSET; |
4286325b | 493 | if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) |
33e53f06 | 494 | r |= RAID10_USE_FAR_SETS; |
fe5d2f4a | 495 | |
33e53f06 HM |
496 | } else |
497 | return -EINVAL; | |
498 | ||
499 | return r | (f << RAID10_FAR_COPIES_SHIFT) | n; | |
500 | } | |
501 | /* END: MD raid10 bit definitions and helpers */ | |
fe5d2f4a | 502 | |
33e53f06 | 503 | /* Check for any of the raid10 algorithms */ |
e6ca5e1a | 504 | static int __got_raid10(struct raid_type *rtp, const int layout) |
33e53f06 HM |
505 | { |
506 | if (rtp->level == 10) { | |
507 | switch (rtp->algorithm) { | |
508 | case ALGORITHM_RAID10_DEFAULT: | |
509 | case ALGORITHM_RAID10_NEAR: | |
e6ca5e1a | 510 | return __is_raid10_near(layout); |
33e53f06 | 511 | case ALGORITHM_RAID10_OFFSET: |
e6ca5e1a | 512 | return __is_raid10_offset(layout); |
33e53f06 | 513 | case ALGORITHM_RAID10_FAR: |
e6ca5e1a | 514 | return __is_raid10_far(layout); |
33e53f06 HM |
515 | default: |
516 | break; | |
517 | } | |
518 | } | |
fe5d2f4a | 519 | |
33e53f06 | 520 | return 0; |
63f33b8d JB |
521 | } |
522 | ||
33e53f06 | 523 | /* Return raid_type for @name */ |
92c83d79 | 524 | static struct raid_type *get_raid_type(const char *name) |
9d09e663 | 525 | { |
33e53f06 | 526 | struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types); |
9d09e663 | 527 | |
33e53f06 HM |
528 | while (rtp-- > raid_types) |
529 | if (!strcasecmp(rtp->name, name)) | |
530 | return rtp; | |
9d09e663 N |
531 | |
532 | return NULL; | |
533 | } | |
534 | ||
33e53f06 HM |
535 | /* Return raid_type for @name based derived from @level and @layout */ |
536 | static struct raid_type *get_raid_type_by_ll(const int level, const int layout) | |
537 | { | |
538 | struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types); | |
539 | ||
540 | while (rtp-- > raid_types) { | |
541 | /* RAID10 special checks based on @layout flags/properties */ | |
542 | if (rtp->level == level && | |
e6ca5e1a | 543 | (__got_raid10(rtp, layout) || rtp->algorithm == layout)) |
33e53f06 HM |
544 | return rtp; |
545 | } | |
546 | ||
547 | return NULL; | |
548 | } | |
549 | ||
3a1c1ef2 HM |
550 | /* |
551 | * Set the mddev properties in @rs to the current | |
552 | * ones retrieved from the freshest superblock | |
553 | */ | |
554 | static void rs_set_cur(struct raid_set *rs) | |
555 | { | |
556 | struct mddev *mddev = &rs->md; | |
557 | ||
558 | mddev->new_level = mddev->level; | |
559 | mddev->new_layout = mddev->layout; | |
560 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
561 | } | |
562 | ||
33e53f06 HM |
563 | /* |
564 | * Set the mddev properties in @rs to the new | |
565 | * ones requested by the ctr | |
566 | */ | |
567 | static void rs_set_new(struct raid_set *rs) | |
568 | { | |
569 | struct mddev *mddev = &rs->md; | |
570 | ||
571 | mddev->level = mddev->new_level; | |
572 | mddev->layout = mddev->new_layout; | |
573 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3a1c1ef2 | 574 | mddev->raid_disks = rs->raid_disks; |
33e53f06 HM |
575 | mddev->delta_disks = 0; |
576 | } | |
577 | ||
bfcee0e3 MS |
578 | static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type, |
579 | unsigned raid_devs) | |
9d09e663 N |
580 | { |
581 | unsigned i; | |
582 | struct raid_set *rs; | |
9d09e663 | 583 | |
bd83a4c4 MS |
584 | if (raid_devs <= raid_type->parity_devs) { |
585 | ti->error = "Insufficient number of devices"; | |
586 | return ERR_PTR(-EINVAL); | |
587 | } | |
9d09e663 | 588 | |
9d09e663 | 589 | rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL); |
bd83a4c4 MS |
590 | if (!rs) { |
591 | ti->error = "Cannot allocate raid context"; | |
592 | return ERR_PTR(-ENOMEM); | |
593 | } | |
9d09e663 N |
594 | |
595 | mddev_init(&rs->md); | |
596 | ||
33e53f06 HM |
597 | rs->raid_disks = raid_devs; |
598 | rs->delta_disks = 0; | |
599 | ||
9d09e663 N |
600 | rs->ti = ti; |
601 | rs->raid_type = raid_type; | |
602 | rs->md.raid_disks = raid_devs; | |
603 | rs->md.level = raid_type->level; | |
604 | rs->md.new_level = rs->md.level; | |
9d09e663 N |
605 | rs->md.layout = raid_type->algorithm; |
606 | rs->md.new_layout = rs->md.layout; | |
607 | rs->md.delta_disks = 0; | |
ecbfb9f1 | 608 | rs->md.recovery_cp = rs_is_raid0(rs) ? MaxSector : 0; |
9d09e663 N |
609 | |
610 | for (i = 0; i < raid_devs; i++) | |
611 | md_rdev_init(&rs->dev[i].rdev); | |
612 | ||
613 | /* | |
614 | * Remaining items to be initialized by further RAID params: | |
615 | * rs->md.persistent | |
616 | * rs->md.external | |
617 | * rs->md.chunk_sectors | |
618 | * rs->md.new_chunk_sectors | |
c039c332 | 619 | * rs->md.dev_sectors |
9d09e663 N |
620 | */ |
621 | ||
622 | return rs; | |
623 | } | |
624 | ||
bfcee0e3 | 625 | static void raid_set_free(struct raid_set *rs) |
9d09e663 N |
626 | { |
627 | int i; | |
628 | ||
b12d437b JB |
629 | for (i = 0; i < rs->md.raid_disks; i++) { |
630 | if (rs->dev[i].meta_dev) | |
631 | dm_put_device(rs->ti, rs->dev[i].meta_dev); | |
545c8795 | 632 | md_rdev_clear(&rs->dev[i].rdev); |
9d09e663 N |
633 | if (rs->dev[i].data_dev) |
634 | dm_put_device(rs->ti, rs->dev[i].data_dev); | |
b12d437b | 635 | } |
9d09e663 N |
636 | |
637 | kfree(rs); | |
638 | } | |
639 | ||
640 | /* | |
641 | * For every device we have two words | |
642 | * <meta_dev>: meta device name or '-' if missing | |
643 | * <data_dev>: data device name or '-' if missing | |
644 | * | |
b12d437b JB |
645 | * The following are permitted: |
646 | * - - | |
647 | * - <data_dev> | |
648 | * <meta_dev> <data_dev> | |
649 | * | |
650 | * The following is not allowed: | |
651 | * <meta_dev> - | |
652 | * | |
653 | * This code parses those words. If there is a failure, | |
bfcee0e3 | 654 | * the caller must use raid_set_free() to unwind the operations. |
9d09e663 | 655 | */ |
702108d1 | 656 | static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as) |
9d09e663 N |
657 | { |
658 | int i; | |
659 | int rebuild = 0; | |
660 | int metadata_available = 0; | |
73c6f239 | 661 | int r = 0; |
92c83d79 | 662 | const char *arg; |
9d09e663 | 663 | |
92c83d79 HM |
664 | /* Put off the number of raid devices argument to get to dev pairs */ |
665 | arg = dm_shift_arg(as); | |
666 | if (!arg) | |
667 | return -EINVAL; | |
668 | ||
669 | for (i = 0; i < rs->md.raid_disks; i++) { | |
9d09e663 N |
670 | rs->dev[i].rdev.raid_disk = i; |
671 | ||
672 | rs->dev[i].meta_dev = NULL; | |
673 | rs->dev[i].data_dev = NULL; | |
674 | ||
675 | /* | |
676 | * There are no offsets, since there is a separate device | |
677 | * for data and metadata. | |
678 | */ | |
679 | rs->dev[i].rdev.data_offset = 0; | |
680 | rs->dev[i].rdev.mddev = &rs->md; | |
681 | ||
92c83d79 HM |
682 | arg = dm_shift_arg(as); |
683 | if (!arg) | |
684 | return -EINVAL; | |
685 | ||
686 | if (strcmp(arg, "-")) { | |
bd83a4c4 MS |
687 | r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table), |
688 | &rs->dev[i].meta_dev); | |
689 | if (r) { | |
690 | rs->ti->error = "RAID metadata device lookup failure"; | |
691 | return r; | |
692 | } | |
b12d437b JB |
693 | |
694 | rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL); | |
bd83a4c4 MS |
695 | if (!rs->dev[i].rdev.sb_page) { |
696 | rs->ti->error = "Failed to allocate superblock page"; | |
697 | return -ENOMEM; | |
698 | } | |
9d09e663 N |
699 | } |
700 | ||
92c83d79 HM |
701 | arg = dm_shift_arg(as); |
702 | if (!arg) | |
703 | return -EINVAL; | |
704 | ||
705 | if (!strcmp(arg, "-")) { | |
9d09e663 | 706 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) && |
bd83a4c4 MS |
707 | (!rs->dev[i].rdev.recovery_offset)) { |
708 | rs->ti->error = "Drive designated for rebuild not specified"; | |
709 | return -EINVAL; | |
710 | } | |
9d09e663 | 711 | |
bd83a4c4 MS |
712 | if (rs->dev[i].meta_dev) { |
713 | rs->ti->error = "No data device supplied with metadata device"; | |
714 | return -EINVAL; | |
715 | } | |
b12d437b | 716 | |
9d09e663 N |
717 | continue; |
718 | } | |
719 | ||
bd83a4c4 MS |
720 | r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table), |
721 | &rs->dev[i].data_dev); | |
722 | if (r) { | |
723 | rs->ti->error = "RAID device lookup failure"; | |
724 | return r; | |
725 | } | |
9d09e663 | 726 | |
b12d437b JB |
727 | if (rs->dev[i].meta_dev) { |
728 | metadata_available = 1; | |
729 | rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev; | |
730 | } | |
9d09e663 | 731 | rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev; |
3a1c1ef2 | 732 | list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks); |
9d09e663 N |
733 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags)) |
734 | rebuild++; | |
735 | } | |
736 | ||
737 | if (metadata_available) { | |
738 | rs->md.external = 0; | |
739 | rs->md.persistent = 1; | |
740 | rs->md.major_version = 2; | |
741 | } else if (rebuild && !rs->md.recovery_cp) { | |
742 | /* | |
743 | * Without metadata, we will not be able to tell if the array | |
744 | * is in-sync or not - we must assume it is not. Therefore, | |
745 | * it is impossible to rebuild a drive. | |
746 | * | |
747 | * Even if there is metadata, the on-disk information may | |
748 | * indicate that the array is not in-sync and it will then | |
749 | * fail at that time. | |
750 | * | |
751 | * User could specify 'nosync' option if desperate. | |
752 | */ | |
bd83a4c4 MS |
753 | rs->ti->error = "Unable to rebuild drive while array is not in-sync"; |
754 | return -EINVAL; | |
9d09e663 N |
755 | } |
756 | ||
757 | return 0; | |
758 | } | |
759 | ||
c1084561 JB |
760 | /* |
761 | * validate_region_size | |
762 | * @rs | |
763 | * @region_size: region size in sectors. If 0, pick a size (4MiB default). | |
764 | * | |
765 | * Set rs->md.bitmap_info.chunksize (which really refers to 'region size'). | |
766 | * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap. | |
767 | * | |
768 | * Returns: 0 on success, -EINVAL on failure. | |
769 | */ | |
770 | static int validate_region_size(struct raid_set *rs, unsigned long region_size) | |
771 | { | |
772 | unsigned long min_region_size = rs->ti->len / (1 << 21); | |
773 | ||
774 | if (!region_size) { | |
775 | /* | |
43157840 | 776 | * Choose a reasonable default. All figures in sectors. |
c1084561 JB |
777 | */ |
778 | if (min_region_size > (1 << 13)) { | |
3a0f9aae | 779 | /* If not a power of 2, make it the next power of 2 */ |
042745ee | 780 | region_size = roundup_pow_of_two(min_region_size); |
c1084561 JB |
781 | DMINFO("Choosing default region size of %lu sectors", |
782 | region_size); | |
c1084561 JB |
783 | } else { |
784 | DMINFO("Choosing default region size of 4MiB"); | |
785 | region_size = 1 << 13; /* sectors */ | |
786 | } | |
787 | } else { | |
788 | /* | |
789 | * Validate user-supplied value. | |
790 | */ | |
bd83a4c4 MS |
791 | if (region_size > rs->ti->len) { |
792 | rs->ti->error = "Supplied region size is too large"; | |
793 | return -EINVAL; | |
794 | } | |
c1084561 JB |
795 | |
796 | if (region_size < min_region_size) { | |
797 | DMERR("Supplied region_size (%lu sectors) below minimum (%lu)", | |
798 | region_size, min_region_size); | |
bd83a4c4 MS |
799 | rs->ti->error = "Supplied region size is too small"; |
800 | return -EINVAL; | |
c1084561 JB |
801 | } |
802 | ||
bd83a4c4 MS |
803 | if (!is_power_of_2(region_size)) { |
804 | rs->ti->error = "Region size is not a power of 2"; | |
805 | return -EINVAL; | |
806 | } | |
c1084561 | 807 | |
bd83a4c4 MS |
808 | if (region_size < rs->md.chunk_sectors) { |
809 | rs->ti->error = "Region size is smaller than the chunk size"; | |
810 | return -EINVAL; | |
811 | } | |
c1084561 JB |
812 | } |
813 | ||
814 | /* | |
815 | * Convert sectors to bytes. | |
816 | */ | |
817 | rs->md.bitmap_info.chunksize = (region_size << 9); | |
818 | ||
819 | return 0; | |
820 | } | |
821 | ||
eb649123 | 822 | /* |
55ebbb59 | 823 | * validate_raid_redundancy |
eb649123 JB |
824 | * @rs |
825 | * | |
55ebbb59 JB |
826 | * Determine if there are enough devices in the array that haven't |
827 | * failed (or are being rebuilt) to form a usable array. | |
eb649123 JB |
828 | * |
829 | * Returns: 0 on success, -EINVAL on failure. | |
830 | */ | |
55ebbb59 | 831 | static int validate_raid_redundancy(struct raid_set *rs) |
eb649123 JB |
832 | { |
833 | unsigned i, rebuild_cnt = 0; | |
3f6bbd3f | 834 | unsigned rebuilds_per_group = 0, copies, d; |
fe5d2f4a | 835 | unsigned group_size, last_group_start; |
eb649123 | 836 | |
eb649123 | 837 | for (i = 0; i < rs->md.raid_disks; i++) |
55ebbb59 JB |
838 | if (!test_bit(In_sync, &rs->dev[i].rdev.flags) || |
839 | !rs->dev[i].rdev.sb_page) | |
eb649123 JB |
840 | rebuild_cnt++; |
841 | ||
842 | switch (rs->raid_type->level) { | |
843 | case 1: | |
844 | if (rebuild_cnt >= rs->md.raid_disks) | |
845 | goto too_many; | |
846 | break; | |
847 | case 4: | |
848 | case 5: | |
849 | case 6: | |
850 | if (rebuild_cnt > rs->raid_type->parity_devs) | |
851 | goto too_many; | |
852 | break; | |
853 | case 10: | |
4ec1e369 JB |
854 | copies = raid10_md_layout_to_copies(rs->md.layout); |
855 | if (rebuild_cnt < copies) | |
856 | break; | |
857 | ||
858 | /* | |
859 | * It is possible to have a higher rebuild count for RAID10, | |
860 | * as long as the failed devices occur in different mirror | |
861 | * groups (i.e. different stripes). | |
862 | * | |
4ec1e369 JB |
863 | * When checking "near" format, make sure no adjacent devices |
864 | * have failed beyond what can be handled. In addition to the | |
865 | * simple case where the number of devices is a multiple of the | |
866 | * number of copies, we must also handle cases where the number | |
867 | * of devices is not a multiple of the number of copies. | |
43157840 MS |
868 | * E.g. dev1 dev2 dev3 dev4 dev5 |
869 | * A A B B C | |
870 | * C D D E E | |
4ec1e369 | 871 | */ |
fe5d2f4a JB |
872 | if (!strcmp("near", raid10_md_layout_to_format(rs->md.layout))) { |
873 | for (i = 0; i < rs->md.raid_disks * copies; i++) { | |
874 | if (!(i % copies)) | |
875 | rebuilds_per_group = 0; | |
876 | d = i % rs->md.raid_disks; | |
877 | if ((!rs->dev[d].rdev.sb_page || | |
878 | !test_bit(In_sync, &rs->dev[d].rdev.flags)) && | |
879 | (++rebuilds_per_group >= copies)) | |
880 | goto too_many; | |
881 | } | |
882 | break; | |
883 | } | |
884 | ||
885 | /* | |
886 | * When checking "far" and "offset" formats, we need to ensure | |
887 | * that the device that holds its copy is not also dead or | |
888 | * being rebuilt. (Note that "far" and "offset" formats only | |
889 | * support two copies right now. These formats also only ever | |
890 | * use the 'use_far_sets' variant.) | |
891 | * | |
892 | * This check is somewhat complicated by the need to account | |
43157840 | 893 | * for arrays that are not a multiple of (far) copies. This |
fe5d2f4a JB |
894 | * results in the need to treat the last (potentially larger) |
895 | * set differently. | |
896 | */ | |
897 | group_size = (rs->md.raid_disks / copies); | |
898 | last_group_start = (rs->md.raid_disks / group_size) - 1; | |
899 | last_group_start *= group_size; | |
900 | for (i = 0; i < rs->md.raid_disks; i++) { | |
901 | if (!(i % copies) && !(i > last_group_start)) | |
55ebbb59 | 902 | rebuilds_per_group = 0; |
fe5d2f4a JB |
903 | if ((!rs->dev[i].rdev.sb_page || |
904 | !test_bit(In_sync, &rs->dev[i].rdev.flags)) && | |
4ec1e369 | 905 | (++rebuilds_per_group >= copies)) |
fe5d2f4a | 906 | goto too_many; |
4ec1e369 JB |
907 | } |
908 | break; | |
eb649123 | 909 | default: |
55ebbb59 JB |
910 | if (rebuild_cnt) |
911 | return -EINVAL; | |
eb649123 JB |
912 | } |
913 | ||
914 | return 0; | |
915 | ||
916 | too_many: | |
eb649123 JB |
917 | return -EINVAL; |
918 | } | |
919 | ||
9d09e663 N |
920 | /* |
921 | * Possible arguments are... | |
9d09e663 N |
922 | * <chunk_size> [optional_args] |
923 | * | |
32737279 JB |
924 | * Argument definitions |
925 | * <chunk_size> The number of sectors per disk that | |
43157840 | 926 | * will form the "stripe" |
32737279 | 927 | * [[no]sync] Force or prevent recovery of the |
43157840 | 928 | * entire array |
9d09e663 | 929 | * [rebuild <idx>] Rebuild the drive indicated by the index |
32737279 | 930 | * [daemon_sleep <ms>] Time between bitmap daemon work to |
43157840 | 931 | * clear bits |
9d09e663 N |
932 | * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization |
933 | * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization | |
46bed2b5 | 934 | * [write_mostly <idx>] Indicate a write mostly drive via index |
9d09e663 N |
935 | * [max_write_behind <sectors>] See '-write-behind=' (man mdadm) |
936 | * [stripe_cache <sectors>] Stripe cache size for higher RAIDs | |
43157840 | 937 | * [region_size <sectors>] Defines granularity of bitmap |
63f33b8d JB |
938 | * |
939 | * RAID10-only options: | |
43157840 | 940 | * [raid10_copies <# copies>] Number of copies. (Default: 2) |
fe5d2f4a | 941 | * [raid10_format <near|far|offset>] Layout algorithm. (Default: near) |
9d09e663 | 942 | */ |
92c83d79 | 943 | static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as, |
9d09e663 N |
944 | unsigned num_raid_params) |
945 | { | |
33e53f06 | 946 | int raid10_format = ALGORITHM_RAID10_DEFAULT; |
63f33b8d | 947 | unsigned raid10_copies = 2; |
eb649123 | 948 | unsigned i; |
92c83d79 | 949 | unsigned value, region_size = 0; |
c039c332 | 950 | sector_t sectors_per_dev = rs->ti->len; |
542f9038 | 951 | sector_t max_io_len; |
92c83d79 | 952 | const char *arg, *key; |
702108d1 | 953 | struct raid_dev *rd; |
33e53f06 | 954 | struct raid_type *rt = rs->raid_type; |
92c83d79 HM |
955 | |
956 | arg = dm_shift_arg(as); | |
957 | num_raid_params--; /* Account for chunk_size argument */ | |
958 | ||
bd83a4c4 MS |
959 | if (kstrtouint(arg, 10, &value) < 0) { |
960 | rs->ti->error = "Bad numerical argument given for chunk_size"; | |
961 | return -EINVAL; | |
962 | } | |
9d09e663 N |
963 | |
964 | /* | |
965 | * First, parse the in-order required arguments | |
32737279 | 966 | * "chunk_size" is the only argument of this type. |
9d09e663 | 967 | */ |
33e53f06 | 968 | if (rt_is_raid1(rt)) { |
32737279 JB |
969 | if (value) |
970 | DMERR("Ignoring chunk size parameter for RAID 1"); | |
971 | value = 0; | |
bd83a4c4 MS |
972 | } else if (!is_power_of_2(value)) { |
973 | rs->ti->error = "Chunk size must be a power of 2"; | |
974 | return -EINVAL; | |
975 | } else if (value < 8) { | |
976 | rs->ti->error = "Chunk size value is too small"; | |
977 | return -EINVAL; | |
978 | } | |
9d09e663 N |
979 | |
980 | rs->md.new_chunk_sectors = rs->md.chunk_sectors = value; | |
9d09e663 N |
981 | |
982 | /* | |
b12d437b JB |
983 | * We set each individual device as In_sync with a completed |
984 | * 'recovery_offset'. If there has been a device failure or | |
985 | * replacement then one of the following cases applies: | |
986 | * | |
987 | * 1) User specifies 'rebuild'. | |
43157840 | 988 | * - Device is reset when param is read. |
b12d437b | 989 | * 2) A new device is supplied. |
43157840 | 990 | * - No matching superblock found, resets device. |
b12d437b | 991 | * 3) Device failure was transient and returns on reload. |
43157840 | 992 | * - Failure noticed, resets device for bitmap replay. |
b12d437b | 993 | * 4) Device hadn't completed recovery after previous failure. |
43157840 | 994 | * - Superblock is read and overrides recovery_offset. |
b12d437b JB |
995 | * |
996 | * What is found in the superblocks of the devices is always | |
997 | * authoritative, unless 'rebuild' or '[no]sync' was specified. | |
9d09e663 | 998 | */ |
b12d437b | 999 | for (i = 0; i < rs->md.raid_disks; i++) { |
9d09e663 | 1000 | set_bit(In_sync, &rs->dev[i].rdev.flags); |
b12d437b JB |
1001 | rs->dev[i].rdev.recovery_offset = MaxSector; |
1002 | } | |
9d09e663 | 1003 | |
b12d437b JB |
1004 | /* |
1005 | * Second, parse the unordered optional arguments | |
1006 | */ | |
9d09e663 | 1007 | for (i = 0; i < num_raid_params; i++) { |
4763e543 | 1008 | key = dm_shift_arg(as); |
bd83a4c4 MS |
1009 | if (!key) { |
1010 | rs->ti->error = "Not enough raid parameters given"; | |
1011 | return -EINVAL; | |
1012 | } | |
92c83d79 | 1013 | |
3fa6cf38 | 1014 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) { |
4286325b | 1015 | if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) { |
bd83a4c4 MS |
1016 | rs->ti->error = "Only one 'nosync' argument allowed"; |
1017 | return -EINVAL; | |
1018 | } | |
9d09e663 | 1019 | rs->md.recovery_cp = MaxSector; |
9d09e663 N |
1020 | continue; |
1021 | } | |
3fa6cf38 | 1022 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) { |
4286325b | 1023 | if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) { |
bd83a4c4 MS |
1024 | rs->ti->error = "Only one 'sync' argument allowed"; |
1025 | return -EINVAL; | |
1026 | } | |
9d09e663 | 1027 | rs->md.recovery_cp = 0; |
4763e543 HM |
1028 | continue; |
1029 | } | |
3fa6cf38 | 1030 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) { |
4286325b | 1031 | if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) { |
bd83a4c4 MS |
1032 | rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed"; |
1033 | return -EINVAL; | |
1034 | } | |
9d09e663 N |
1035 | continue; |
1036 | } | |
1037 | ||
92c83d79 HM |
1038 | arg = dm_shift_arg(as); |
1039 | i++; /* Account for the argument pairs */ | |
bd83a4c4 MS |
1040 | if (!arg) { |
1041 | rs->ti->error = "Wrong number of raid parameters given"; | |
1042 | return -EINVAL; | |
1043 | } | |
63f33b8d | 1044 | |
702108d1 HM |
1045 | /* |
1046 | * Parameters that take a string value are checked here. | |
1047 | */ | |
1048 | ||
3fa6cf38 | 1049 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) { |
4286325b | 1050 | if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) { |
bd83a4c4 MS |
1051 | rs->ti->error = "Only one 'raid10_format' argument pair allowed"; |
1052 | return -EINVAL; | |
1053 | } | |
1054 | if (!rt_is_raid10(rt)) { | |
1055 | rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type"; | |
1056 | return -EINVAL; | |
1057 | } | |
33e53f06 | 1058 | raid10_format = raid10_name_to_format(arg); |
bd83a4c4 MS |
1059 | if (raid10_format < 0) { |
1060 | rs->ti->error = "Invalid 'raid10_format' value given"; | |
1061 | return raid10_format; | |
1062 | } | |
63f33b8d JB |
1063 | continue; |
1064 | } | |
1065 | ||
bd83a4c4 MS |
1066 | if (kstrtouint(arg, 10, &value) < 0) { |
1067 | rs->ti->error = "Bad numerical argument given in raid params"; | |
1068 | return -EINVAL; | |
1069 | } | |
702108d1 | 1070 | |
3fa6cf38 | 1071 | if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) { |
702108d1 HM |
1072 | /* |
1073 | * "rebuild" is being passed in by userspace to provide | |
1074 | * indexes of replaced devices and to set up additional | |
1075 | * devices on raid level takeover. | |
43157840 | 1076 | */ |
bb91a63f | 1077 | if (!__within_range(value, 0, rs->raid_disks - 1)) { |
bd83a4c4 MS |
1078 | rs->ti->error = "Invalid rebuild index given"; |
1079 | return -EINVAL; | |
1080 | } | |
702108d1 | 1081 | |
bd83a4c4 MS |
1082 | if (test_and_set_bit(value, (void *) rs->rebuild_disks)) { |
1083 | rs->ti->error = "rebuild for this index already given"; | |
1084 | return -EINVAL; | |
1085 | } | |
ecbfb9f1 | 1086 | |
702108d1 HM |
1087 | rd = rs->dev + value; |
1088 | clear_bit(In_sync, &rd->rdev.flags); | |
1089 | clear_bit(Faulty, &rd->rdev.flags); | |
1090 | rd->rdev.recovery_offset = 0; | |
4286325b | 1091 | set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags); |
3fa6cf38 | 1092 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) { |
bd83a4c4 MS |
1093 | if (!rt_is_raid1(rt)) { |
1094 | rs->ti->error = "write_mostly option is only valid for RAID1"; | |
1095 | return -EINVAL; | |
1096 | } | |
702108d1 | 1097 | |
bb91a63f | 1098 | if (!__within_range(value, 0, rs->md.raid_disks - 1)) { |
bd83a4c4 MS |
1099 | rs->ti->error = "Invalid write_mostly index given"; |
1100 | return -EINVAL; | |
1101 | } | |
9d09e663 | 1102 | |
46bed2b5 | 1103 | set_bit(WriteMostly, &rs->dev[value].rdev.flags); |
4286325b | 1104 | set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags); |
3fa6cf38 | 1105 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) { |
bd83a4c4 MS |
1106 | if (!rt_is_raid1(rt)) { |
1107 | rs->ti->error = "max_write_behind option is only valid for RAID1"; | |
1108 | return -EINVAL; | |
1109 | } | |
702108d1 | 1110 | |
4286325b | 1111 | if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) { |
bd83a4c4 MS |
1112 | rs->ti->error = "Only one max_write_behind argument pair allowed"; |
1113 | return -EINVAL; | |
1114 | } | |
9d09e663 N |
1115 | |
1116 | /* | |
1117 | * In device-mapper, we specify things in sectors, but | |
1118 | * MD records this value in kB | |
1119 | */ | |
1120 | value /= 2; | |
bd83a4c4 MS |
1121 | if (value > COUNTER_MAX) { |
1122 | rs->ti->error = "Max write-behind limit out of range"; | |
1123 | return -EINVAL; | |
1124 | } | |
702108d1 | 1125 | |
9d09e663 | 1126 | rs->md.bitmap_info.max_write_behind = value; |
3fa6cf38 | 1127 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) { |
4286325b | 1128 | if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) { |
bd83a4c4 MS |
1129 | rs->ti->error = "Only one daemon_sleep argument pair allowed"; |
1130 | return -EINVAL; | |
1131 | } | |
1132 | if (!value || (value > MAX_SCHEDULE_TIMEOUT)) { | |
1133 | rs->ti->error = "daemon sleep period out of range"; | |
1134 | return -EINVAL; | |
1135 | } | |
9d09e663 | 1136 | rs->md.bitmap_info.daemon_sleep = value; |
3fa6cf38 | 1137 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) { |
4763e543 | 1138 | /* Userspace passes new data_offset after having extended the the data image LV */ |
4286325b | 1139 | if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) { |
bd83a4c4 MS |
1140 | rs->ti->error = "Only one data_offset argument pair allowed"; |
1141 | return -EINVAL; | |
1142 | } | |
4763e543 | 1143 | /* Ensure sensible data offset */ |
bd83a4c4 MS |
1144 | if (value < 0) { |
1145 | rs->ti->error = "Bogus data_offset value"; | |
1146 | return -EINVAL; | |
1147 | } | |
4763e543 | 1148 | rs->data_offset = value; |
3fa6cf38 | 1149 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) { |
4763e543 | 1150 | /* Define the +/-# of disks to add to/remove from the given raid set */ |
4286325b | 1151 | if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) { |
bd83a4c4 MS |
1152 | rs->ti->error = "Only one delta_disks argument pair allowed"; |
1153 | return -EINVAL; | |
1154 | } | |
4763e543 | 1155 | /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */ |
bb91a63f | 1156 | if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) { |
bd83a4c4 MS |
1157 | rs->ti->error = "Too many delta_disk requested"; |
1158 | return -EINVAL; | |
1159 | } | |
4763e543 HM |
1160 | |
1161 | rs->delta_disks = value; | |
3fa6cf38 | 1162 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) { |
4286325b | 1163 | if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) { |
bd83a4c4 MS |
1164 | rs->ti->error = "Only one stripe_cache argument pair allowed"; |
1165 | return -EINVAL; | |
1166 | } | |
1167 | ||
9d09e663 N |
1168 | /* |
1169 | * In device-mapper, we specify things in sectors, but | |
1170 | * MD records this value in kB | |
1171 | */ | |
1172 | value /= 2; | |
1173 | ||
bd83a4c4 MS |
1174 | if (!rt_is_raid456(rt)) { |
1175 | rs->ti->error = "Inappropriate argument: stripe_cache"; | |
1176 | return -EINVAL; | |
1177 | } | |
1178 | if (raid5_set_cache_size(&rs->md, (int)value)) { | |
1179 | rs->ti->error = "Bad stripe_cache size"; | |
1180 | return -EINVAL; | |
1181 | } | |
702108d1 | 1182 | |
3fa6cf38 | 1183 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) { |
4286325b | 1184 | if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) { |
bd83a4c4 MS |
1185 | rs->ti->error = "Only one min_recovery_rate argument pair allowed"; |
1186 | return -EINVAL; | |
1187 | } | |
1188 | if (value > INT_MAX) { | |
1189 | rs->ti->error = "min_recovery_rate out of range"; | |
1190 | return -EINVAL; | |
1191 | } | |
9d09e663 | 1192 | rs->md.sync_speed_min = (int)value; |
3fa6cf38 | 1193 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) { |
4286325b | 1194 | if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) { |
bd83a4c4 MS |
1195 | rs->ti->error = "Only one max_recovery_rate argument pair allowed"; |
1196 | return -EINVAL; | |
1197 | } | |
1198 | if (value > INT_MAX) { | |
1199 | rs->ti->error = "max_recovery_rate out of range"; | |
1200 | return -EINVAL; | |
1201 | } | |
9d09e663 | 1202 | rs->md.sync_speed_max = (int)value; |
3fa6cf38 | 1203 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) { |
4286325b | 1204 | if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) { |
bd83a4c4 MS |
1205 | rs->ti->error = "Only one region_size argument pair allowed"; |
1206 | return -EINVAL; | |
1207 | } | |
702108d1 | 1208 | |
c1084561 | 1209 | region_size = value; |
3fa6cf38 | 1210 | } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) { |
4286325b | 1211 | if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) { |
bd83a4c4 MS |
1212 | rs->ti->error = "Only one raid10_copies argument pair allowed"; |
1213 | return -EINVAL; | |
1214 | } | |
702108d1 | 1215 | |
bb91a63f | 1216 | if (!__within_range(value, 2, rs->md.raid_disks)) { |
bd83a4c4 MS |
1217 | rs->ti->error = "Bad value for 'raid10_copies'"; |
1218 | return -EINVAL; | |
1219 | } | |
702108d1 | 1220 | |
63f33b8d | 1221 | raid10_copies = value; |
9d09e663 N |
1222 | } else { |
1223 | DMERR("Unable to parse RAID parameter: %s", key); | |
bd83a4c4 MS |
1224 | rs->ti->error = "Unable to parse RAID parameter"; |
1225 | return -EINVAL; | |
9d09e663 N |
1226 | } |
1227 | } | |
1228 | ||
c1084561 JB |
1229 | if (validate_region_size(rs, region_size)) |
1230 | return -EINVAL; | |
1231 | ||
1232 | if (rs->md.chunk_sectors) | |
542f9038 | 1233 | max_io_len = rs->md.chunk_sectors; |
c1084561 | 1234 | else |
542f9038 | 1235 | max_io_len = region_size; |
c1084561 | 1236 | |
542f9038 MS |
1237 | if (dm_set_target_max_io_len(rs->ti, max_io_len)) |
1238 | return -EINVAL; | |
32737279 | 1239 | |
33e53f06 | 1240 | if (rt_is_raid10(rt)) { |
bd83a4c4 MS |
1241 | if (raid10_copies > rs->md.raid_disks) { |
1242 | rs->ti->error = "Not enough devices to satisfy specification"; | |
1243 | return -EINVAL; | |
1244 | } | |
63f33b8d | 1245 | |
33e53f06 | 1246 | rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies); |
bd83a4c4 MS |
1247 | if (rs->md.new_layout < 0) { |
1248 | rs->ti->error = "Error getting raid10 format"; | |
1249 | return rs->md.new_layout; | |
1250 | } | |
33e53f06 HM |
1251 | |
1252 | rt = get_raid_type_by_ll(10, rs->md.new_layout); | |
bd83a4c4 MS |
1253 | if (!rt) { |
1254 | rs->ti->error = "Failed to recognize new raid10 layout"; | |
1255 | return -EINVAL; | |
1256 | } | |
33e53f06 HM |
1257 | |
1258 | if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT || | |
1259 | rt->algorithm == ALGORITHM_RAID10_NEAR) && | |
4286325b | 1260 | test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) { |
bd83a4c4 MS |
1261 | rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible"; |
1262 | return -EINVAL; | |
1263 | } | |
fe5d2f4a | 1264 | |
63f33b8d JB |
1265 | /* (Len * #mirrors) / #devices */ |
1266 | sectors_per_dev = rs->ti->len * raid10_copies; | |
1267 | sector_div(sectors_per_dev, rs->md.raid_disks); | |
1268 | ||
33e53f06 | 1269 | rs->md.layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies); |
63f33b8d | 1270 | rs->md.new_layout = rs->md.layout; |
33e53f06 | 1271 | } else if (!rt_is_raid1(rt) && |
bd83a4c4 MS |
1272 | sector_div(sectors_per_dev, (rs->md.raid_disks - rt->parity_devs))) { |
1273 | rs->ti->error = "Target length not divisible by number of data devices"; | |
1274 | return -EINVAL; | |
1275 | } | |
702108d1 | 1276 | |
33e53f06 | 1277 | rs->raid10_copies = raid10_copies; |
c039c332 JB |
1278 | rs->md.dev_sectors = sectors_per_dev; |
1279 | ||
9d09e663 N |
1280 | /* Assume there are no metadata devices until the drives are parsed */ |
1281 | rs->md.persistent = 0; | |
1282 | rs->md.external = 1; | |
1283 | ||
f090279e HM |
1284 | /* Check, if any invalid ctr arguments have been passed in for the raid level */ |
1285 | return rs_check_for_invalid_flags(rs); | |
9d09e663 N |
1286 | } |
1287 | ||
3a1c1ef2 HM |
1288 | /* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */ |
1289 | static unsigned int mddev_data_stripes(struct raid_set *rs) | |
1290 | { | |
1291 | return rs->md.raid_disks - rs->raid_type->parity_devs; | |
1292 | } | |
1293 | ||
9d09e663 N |
1294 | static void do_table_event(struct work_struct *ws) |
1295 | { | |
1296 | struct raid_set *rs = container_of(ws, struct raid_set, md.event_work); | |
1297 | ||
1298 | dm_table_event(rs->ti->table); | |
1299 | } | |
1300 | ||
1301 | static int raid_is_congested(struct dm_target_callbacks *cb, int bits) | |
1302 | { | |
1303 | struct raid_set *rs = container_of(cb, struct raid_set, callbacks); | |
1304 | ||
5c675f83 | 1305 | return mddev_congested(&rs->md, bits); |
9d09e663 N |
1306 | } |
1307 | ||
ecbfb9f1 HM |
1308 | /* |
1309 | * Make sure a valid takover (level switch) is being requested on @rs | |
1310 | * | |
1311 | * Conversions of raid sets from one MD personality to another | |
1312 | * have to conform to restrictions which are enforced here. | |
1313 | * | |
1314 | * Degration is already checked for in rs_check_conversion() below. | |
1315 | */ | |
1316 | static int rs_check_takeover(struct raid_set *rs) | |
1317 | { | |
1318 | struct mddev *mddev = &rs->md; | |
1319 | unsigned int near_copies; | |
1320 | ||
1321 | switch (mddev->level) { | |
1322 | case 0: | |
1323 | /* raid0 -> raid1/5 with one disk */ | |
1324 | if ((mddev->new_level == 1 || mddev->new_level == 5) && | |
1325 | mddev->raid_disks == 1) | |
1326 | return 0; | |
1327 | ||
1328 | /* raid0 -> raid10 */ | |
1329 | if (mddev->new_level == 10 && | |
1330 | !(rs->raid_disks % 2)) | |
1331 | return 0; | |
1332 | ||
1333 | /* raid0 with multiple disks -> raid4/5/6 */ | |
bb91a63f | 1334 | if (__within_range(mddev->new_level, 4, 6) && |
ecbfb9f1 HM |
1335 | mddev->new_layout == ALGORITHM_PARITY_N && |
1336 | mddev->raid_disks > 1) | |
1337 | return 0; | |
1338 | ||
1339 | break; | |
1340 | ||
1341 | case 10: | |
1342 | /* Can't takeover raid10_offset! */ | |
e6ca5e1a | 1343 | if (__is_raid10_offset(mddev->layout)) |
ecbfb9f1 HM |
1344 | break; |
1345 | ||
e6ca5e1a | 1346 | near_copies = __raid10_near_copies(mddev->layout); |
ecbfb9f1 HM |
1347 | |
1348 | /* raid10* -> raid0 */ | |
1349 | if (mddev->new_level == 0) { | |
1350 | /* Can takeover raid10_near with raid disks divisable by data copies! */ | |
1351 | if (near_copies > 1 && | |
1352 | !(mddev->raid_disks % near_copies)) { | |
1353 | mddev->raid_disks /= near_copies; | |
1354 | mddev->delta_disks = mddev->raid_disks; | |
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | /* Can takeover raid10_far */ | |
1359 | if (near_copies == 1 && | |
e6ca5e1a | 1360 | __raid10_far_copies(mddev->layout) > 1) |
ecbfb9f1 HM |
1361 | return 0; |
1362 | ||
1363 | break; | |
1364 | } | |
1365 | ||
1366 | /* raid10_{near,far} -> raid1 */ | |
1367 | if (mddev->new_level == 1 && | |
e6ca5e1a | 1368 | max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks) |
ecbfb9f1 HM |
1369 | return 0; |
1370 | ||
1371 | /* raid10_{near,far} with 2 disks -> raid4/5 */ | |
bb91a63f | 1372 | if (__within_range(mddev->new_level, 4, 5) && |
ecbfb9f1 HM |
1373 | mddev->raid_disks == 2) |
1374 | return 0; | |
1375 | break; | |
1376 | ||
1377 | case 1: | |
1378 | /* raid1 with 2 disks -> raid4/5 */ | |
bb91a63f | 1379 | if (__within_range(mddev->new_level, 4, 5) && |
ecbfb9f1 HM |
1380 | mddev->raid_disks == 2) { |
1381 | mddev->degraded = 1; | |
1382 | return 0; | |
1383 | } | |
1384 | ||
1385 | /* raid1 -> raid0 */ | |
1386 | if (mddev->new_level == 0 && | |
1387 | mddev->raid_disks == 1) | |
1388 | return 0; | |
1389 | ||
1390 | /* raid1 -> raid10 */ | |
1391 | if (mddev->new_level == 10) | |
1392 | return 0; | |
1393 | ||
1394 | break; | |
1395 | ||
1396 | case 4: | |
1397 | /* raid4 -> raid0 */ | |
1398 | if (mddev->new_level == 0) | |
1399 | return 0; | |
1400 | ||
1401 | /* raid4 -> raid1/5 with 2 disks */ | |
1402 | if ((mddev->new_level == 1 || mddev->new_level == 5) && | |
1403 | mddev->raid_disks == 2) | |
1404 | return 0; | |
1405 | ||
1406 | /* raid4 -> raid5/6 with parity N */ | |
bb91a63f | 1407 | if (__within_range(mddev->new_level, 5, 6) && |
ecbfb9f1 HM |
1408 | mddev->layout == ALGORITHM_PARITY_N) |
1409 | return 0; | |
1410 | break; | |
1411 | ||
1412 | case 5: | |
1413 | /* raid5 with parity N -> raid0 */ | |
1414 | if (mddev->new_level == 0 && | |
1415 | mddev->layout == ALGORITHM_PARITY_N) | |
1416 | return 0; | |
1417 | ||
1418 | /* raid5 with parity N -> raid4 */ | |
1419 | if (mddev->new_level == 4 && | |
1420 | mddev->layout == ALGORITHM_PARITY_N) | |
1421 | return 0; | |
1422 | ||
1423 | /* raid5 with 2 disks -> raid1/4/10 */ | |
1424 | if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) && | |
1425 | mddev->raid_disks == 2) | |
1426 | return 0; | |
1427 | ||
1428 | /* raid5 with parity N -> raid6 with parity N */ | |
1429 | if (mddev->new_level == 6 && | |
1430 | ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) || | |
bb91a63f | 1431 | __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6))) |
ecbfb9f1 HM |
1432 | return 0; |
1433 | break; | |
1434 | ||
1435 | case 6: | |
1436 | /* raid6 with parity N -> raid0 */ | |
1437 | if (mddev->new_level == 0 && | |
1438 | mddev->layout == ALGORITHM_PARITY_N) | |
1439 | return 0; | |
1440 | ||
1441 | /* raid6 with parity N -> raid4 */ | |
1442 | if (mddev->new_level == 4 && | |
1443 | mddev->layout == ALGORITHM_PARITY_N) | |
1444 | return 0; | |
1445 | ||
1446 | /* raid6_*_n with parity N -> raid5_* */ | |
1447 | if (mddev->new_level == 5 && | |
1448 | ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) || | |
bb91a63f | 1449 | __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC))) |
ecbfb9f1 HM |
1450 | return 0; |
1451 | ||
1452 | default: | |
1453 | break; | |
1454 | } | |
1455 | ||
bd83a4c4 MS |
1456 | rs->ti->error = "takeover not possible"; |
1457 | return -EINVAL; | |
ecbfb9f1 HM |
1458 | } |
1459 | ||
1460 | /* True if @rs requested to be taken over */ | |
1461 | static bool rs_takeover_requested(struct raid_set *rs) | |
1462 | { | |
1463 | return rs->md.new_level != rs->md.level; | |
1464 | } | |
1465 | ||
33e53f06 | 1466 | /* Features */ |
9b6e5423 | 1467 | #define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */ |
33e53f06 HM |
1468 | |
1469 | /* State flags for sb->flags */ | |
1470 | #define SB_FLAG_RESHAPE_ACTIVE 0x1 | |
1471 | #define SB_FLAG_RESHAPE_BACKWARDS 0x2 | |
1472 | ||
b12d437b JB |
1473 | /* |
1474 | * This structure is never routinely used by userspace, unlike md superblocks. | |
1475 | * Devices with this superblock should only ever be accessed via device-mapper. | |
1476 | */ | |
1477 | #define DM_RAID_MAGIC 0x64526D44 | |
1478 | struct dm_raid_superblock { | |
1479 | __le32 magic; /* "DmRd" */ | |
9b6e5423 | 1480 | __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */ |
b12d437b | 1481 | |
33e53f06 HM |
1482 | __le32 num_devices; /* Number of devices in this raid set. (Max 64) */ |
1483 | __le32 array_position; /* The position of this drive in the raid set */ | |
b12d437b JB |
1484 | |
1485 | __le64 events; /* Incremented by md when superblock updated */ | |
9b6e5423 | 1486 | __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */ |
33e53f06 | 1487 | /* indicate failures (see extension below) */ |
b12d437b JB |
1488 | |
1489 | /* | |
1490 | * This offset tracks the progress of the repair or replacement of | |
1491 | * an individual drive. | |
1492 | */ | |
1493 | __le64 disk_recovery_offset; | |
1494 | ||
1495 | /* | |
33e53f06 | 1496 | * This offset tracks the progress of the initial raid set |
b12d437b JB |
1497 | * synchronisation/parity calculation. |
1498 | */ | |
1499 | __le64 array_resync_offset; | |
1500 | ||
1501 | /* | |
33e53f06 | 1502 | * raid characteristics |
b12d437b JB |
1503 | */ |
1504 | __le32 level; | |
1505 | __le32 layout; | |
1506 | __le32 stripe_sectors; | |
1507 | ||
33e53f06 | 1508 | /******************************************************************** |
9b6e5423 | 1509 | * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!! |
33e53f06 | 1510 | * |
9b6e5423 | 1511 | * FEATURE_FLAG_SUPPORTS_V190 in the features member indicates that those exist |
33e53f06 HM |
1512 | */ |
1513 | ||
1514 | __le32 flags; /* Flags defining array states for reshaping */ | |
1515 | ||
1516 | /* | |
1517 | * This offset tracks the progress of a raid | |
1518 | * set reshape in order to be able to restart it | |
1519 | */ | |
1520 | __le64 reshape_position; | |
1521 | ||
1522 | /* | |
1523 | * These define the properties of the array in case of an interrupted reshape | |
1524 | */ | |
1525 | __le32 new_level; | |
1526 | __le32 new_layout; | |
1527 | __le32 new_stripe_sectors; | |
1528 | __le32 delta_disks; | |
1529 | ||
1530 | __le64 array_sectors; /* Array size in sectors */ | |
1531 | ||
1532 | /* | |
1533 | * Sector offsets to data on devices (reshaping). | |
1534 | * Needed to support out of place reshaping, thus | |
1535 | * not writing over any stripes whilst converting | |
1536 | * them from old to new layout | |
1537 | */ | |
1538 | __le64 data_offset; | |
1539 | __le64 new_data_offset; | |
1540 | ||
1541 | __le64 sectors; /* Used device size in sectors */ | |
1542 | ||
1543 | /* | |
1544 | * Additonal Bit field of devices indicating failures to support | |
9b6e5423 | 1545 | * up to 256 devices with the 1.9.0 on-disk metadata format |
33e53f06 HM |
1546 | */ |
1547 | __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1]; | |
1548 | ||
1549 | __le32 incompat_features; /* Used to indicate any incompatible features */ | |
1550 | ||
1551 | /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */ | |
b12d437b JB |
1552 | } __packed; |
1553 | ||
3cb03002 | 1554 | static int read_disk_sb(struct md_rdev *rdev, int size) |
b12d437b JB |
1555 | { |
1556 | BUG_ON(!rdev->sb_page); | |
1557 | ||
1558 | if (rdev->sb_loaded) | |
1559 | return 0; | |
1560 | ||
796a5cf0 | 1561 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, 1)) { |
0447568f JB |
1562 | DMERR("Failed to read superblock of device at position %d", |
1563 | rdev->raid_disk); | |
c32fb9e7 | 1564 | md_error(rdev->mddev, rdev); |
b12d437b JB |
1565 | return -EINVAL; |
1566 | } | |
1567 | ||
1568 | rdev->sb_loaded = 1; | |
1569 | ||
1570 | return 0; | |
1571 | } | |
1572 | ||
33e53f06 HM |
1573 | static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices) |
1574 | { | |
1575 | failed_devices[0] = le64_to_cpu(sb->failed_devices); | |
1576 | memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices)); | |
1577 | ||
4286325b | 1578 | if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) { |
33e53f06 HM |
1579 | int i = ARRAY_SIZE(sb->extended_failed_devices); |
1580 | ||
1581 | while (i--) | |
1582 | failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]); | |
1583 | } | |
1584 | } | |
1585 | ||
7b34df74 HM |
1586 | static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices) |
1587 | { | |
1588 | int i = ARRAY_SIZE(sb->extended_failed_devices); | |
1589 | ||
1590 | sb->failed_devices = cpu_to_le64(failed_devices[0]); | |
1591 | while (i--) | |
1592 | sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]); | |
1593 | } | |
1594 | ||
1595 | /* | |
1596 | * Synchronize the superblock members with the raid set properties | |
1597 | * | |
1598 | * All superblock data is little endian. | |
1599 | */ | |
fd01b88c | 1600 | static void super_sync(struct mddev *mddev, struct md_rdev *rdev) |
b12d437b | 1601 | { |
7b34df74 HM |
1602 | bool update_failed_devices = false; |
1603 | unsigned int i; | |
1604 | uint64_t failed_devices[DISKS_ARRAY_ELEMS]; | |
b12d437b | 1605 | struct dm_raid_superblock *sb; |
81f382f9 | 1606 | struct raid_set *rs = container_of(mddev, struct raid_set, md); |
b12d437b | 1607 | |
7b34df74 HM |
1608 | /* No metadata device, no superblock */ |
1609 | if (!rdev->meta_bdev) | |
1610 | return; | |
1611 | ||
1612 | BUG_ON(!rdev->sb_page); | |
1613 | ||
b12d437b | 1614 | sb = page_address(rdev->sb_page); |
b12d437b | 1615 | |
7b34df74 | 1616 | sb_retrieve_failed_devices(sb, failed_devices); |
b12d437b | 1617 | |
7b34df74 HM |
1618 | for (i = 0; i < rs->raid_disks; i++) |
1619 | if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) { | |
1620 | update_failed_devices = true; | |
1621 | set_bit(i, (void *) failed_devices); | |
1622 | } | |
1623 | ||
1624 | if (update_failed_devices) | |
1625 | sb_update_failed_devices(sb, failed_devices); | |
b12d437b JB |
1626 | |
1627 | sb->magic = cpu_to_le32(DM_RAID_MAGIC); | |
9b6e5423 | 1628 | sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190); |
b12d437b JB |
1629 | |
1630 | sb->num_devices = cpu_to_le32(mddev->raid_disks); | |
1631 | sb->array_position = cpu_to_le32(rdev->raid_disk); | |
1632 | ||
1633 | sb->events = cpu_to_le64(mddev->events); | |
b12d437b JB |
1634 | |
1635 | sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset); | |
1636 | sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1637 | ||
1638 | sb->level = cpu_to_le32(mddev->level); | |
1639 | sb->layout = cpu_to_le32(mddev->layout); | |
1640 | sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors); | |
7b34df74 HM |
1641 | |
1642 | sb->new_level = cpu_to_le32(mddev->new_level); | |
1643 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1644 | sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors); | |
1645 | ||
1646 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1647 | ||
1648 | smp_rmb(); /* Make sure we access most recent reshape position */ | |
1649 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1650 | if (le64_to_cpu(sb->reshape_position) != MaxSector) { | |
1651 | /* Flag ongoing reshape */ | |
1652 | sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE); | |
1653 | ||
1654 | if (mddev->delta_disks < 0 || mddev->reshape_backwards) | |
1655 | sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS); | |
4286325b MS |
1656 | } else { |
1657 | /* Clear reshape flags */ | |
1658 | sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS)); | |
1659 | } | |
7b34df74 HM |
1660 | |
1661 | sb->array_sectors = cpu_to_le64(mddev->array_sectors); | |
1662 | sb->data_offset = cpu_to_le64(rdev->data_offset); | |
1663 | sb->new_data_offset = cpu_to_le64(rdev->new_data_offset); | |
1664 | sb->sectors = cpu_to_le64(rdev->sectors); | |
1665 | ||
1666 | /* Zero out the rest of the payload after the size of the superblock */ | |
1667 | memset(sb + 1, 0, rdev->sb_size - sizeof(*sb)); | |
b12d437b JB |
1668 | } |
1669 | ||
1670 | /* | |
1671 | * super_load | |
1672 | * | |
1673 | * This function creates a superblock if one is not found on the device | |
1674 | * and will decide which superblock to use if there's a choice. | |
1675 | * | |
1676 | * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise | |
1677 | */ | |
3cb03002 | 1678 | static int super_load(struct md_rdev *rdev, struct md_rdev *refdev) |
b12d437b | 1679 | { |
73c6f239 | 1680 | int r; |
b12d437b JB |
1681 | struct dm_raid_superblock *sb; |
1682 | struct dm_raid_superblock *refsb; | |
1683 | uint64_t events_sb, events_refsb; | |
1684 | ||
1685 | rdev->sb_start = 0; | |
40d43c4b HM |
1686 | rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev); |
1687 | if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) { | |
1688 | DMERR("superblock size of a logical block is no longer valid"); | |
1689 | return -EINVAL; | |
1690 | } | |
b12d437b | 1691 | |
73c6f239 HM |
1692 | r = read_disk_sb(rdev, rdev->sb_size); |
1693 | if (r) | |
1694 | return r; | |
b12d437b JB |
1695 | |
1696 | sb = page_address(rdev->sb_page); | |
3aa3b2b2 JB |
1697 | |
1698 | /* | |
1699 | * Two cases that we want to write new superblocks and rebuild: | |
1700 | * 1) New device (no matching magic number) | |
1701 | * 2) Device specified for rebuild (!In_sync w/ offset == 0) | |
1702 | */ | |
1703 | if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) || | |
1704 | (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) { | |
b12d437b JB |
1705 | super_sync(rdev->mddev, rdev); |
1706 | ||
1707 | set_bit(FirstUse, &rdev->flags); | |
9b6e5423 | 1708 | sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190); |
b12d437b JB |
1709 | |
1710 | /* Force writing of superblocks to disk */ | |
1711 | set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags); | |
1712 | ||
1713 | /* Any superblock is better than none, choose that if given */ | |
1714 | return refdev ? 0 : 1; | |
1715 | } | |
1716 | ||
1717 | if (!refdev) | |
1718 | return 1; | |
1719 | ||
1720 | events_sb = le64_to_cpu(sb->events); | |
1721 | ||
1722 | refsb = page_address(refdev->sb_page); | |
1723 | events_refsb = le64_to_cpu(refsb->events); | |
1724 | ||
1725 | return (events_sb > events_refsb) ? 1 : 0; | |
1726 | } | |
1727 | ||
33e53f06 | 1728 | static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev) |
b12d437b JB |
1729 | { |
1730 | int role; | |
33e53f06 HM |
1731 | unsigned int d; |
1732 | struct mddev *mddev = &rs->md; | |
b12d437b | 1733 | uint64_t events_sb; |
33e53f06 | 1734 | uint64_t failed_devices[DISKS_ARRAY_ELEMS]; |
b12d437b | 1735 | struct dm_raid_superblock *sb; |
33e53f06 | 1736 | uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0; |
dafb20fa | 1737 | struct md_rdev *r; |
b12d437b JB |
1738 | struct dm_raid_superblock *sb2; |
1739 | ||
1740 | sb = page_address(rdev->sb_page); | |
1741 | events_sb = le64_to_cpu(sb->events); | |
b12d437b JB |
1742 | |
1743 | /* | |
1744 | * Initialise to 1 if this is a new superblock. | |
1745 | */ | |
1746 | mddev->events = events_sb ? : 1; | |
1747 | ||
33e53f06 HM |
1748 | mddev->reshape_position = MaxSector; |
1749 | ||
b12d437b | 1750 | /* |
33e53f06 HM |
1751 | * Reshaping is supported, e.g. reshape_position is valid |
1752 | * in superblock and superblock content is authoritative. | |
b12d437b | 1753 | */ |
4286325b | 1754 | if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) { |
33e53f06 HM |
1755 | /* Superblock is authoritative wrt given raid set layout! */ |
1756 | mddev->raid_disks = le32_to_cpu(sb->num_devices); | |
1757 | mddev->level = le32_to_cpu(sb->level); | |
1758 | mddev->layout = le32_to_cpu(sb->layout); | |
1759 | mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors); | |
1760 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1761 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
1762 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors); | |
1763 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1764 | mddev->array_sectors = le64_to_cpu(sb->array_sectors); | |
1765 | ||
1766 | /* raid was reshaping and got interrupted */ | |
4286325b MS |
1767 | if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) { |
1768 | if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) { | |
33e53f06 HM |
1769 | DMERR("Reshape requested but raid set is still reshaping"); |
1770 | return -EINVAL; | |
1771 | } | |
b12d437b | 1772 | |
33e53f06 | 1773 | if (mddev->delta_disks < 0 || |
4286325b | 1774 | (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS))) |
33e53f06 HM |
1775 | mddev->reshape_backwards = 1; |
1776 | else | |
1777 | mddev->reshape_backwards = 0; | |
1778 | ||
1779 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1780 | rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout); | |
1781 | } | |
1782 | ||
1783 | } else { | |
1784 | /* | |
9b6e5423 | 1785 | * No takeover/reshaping, because we don't have the extended v1.9.0 metadata |
33e53f06 HM |
1786 | */ |
1787 | if (le32_to_cpu(sb->level) != mddev->level) { | |
1788 | DMERR("Reshaping/takeover raid sets not yet supported. (raid level/stripes/size change)"); | |
1789 | return -EINVAL; | |
1790 | } | |
1791 | if (le32_to_cpu(sb->layout) != mddev->layout) { | |
1792 | DMERR("Reshaping raid sets not yet supported. (raid layout change)"); | |
43157840 MS |
1793 | DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout); |
1794 | DMERR(" Old layout: %s w/ %d copies", | |
33e53f06 HM |
1795 | raid10_md_layout_to_format(le32_to_cpu(sb->layout)), |
1796 | raid10_md_layout_to_copies(le32_to_cpu(sb->layout))); | |
43157840 | 1797 | DMERR(" New layout: %s w/ %d copies", |
33e53f06 HM |
1798 | raid10_md_layout_to_format(mddev->layout), |
1799 | raid10_md_layout_to_copies(mddev->layout)); | |
1800 | return -EINVAL; | |
1801 | } | |
1802 | if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) { | |
1803 | DMERR("Reshaping raid sets not yet supported. (stripe sectors change)"); | |
1804 | return -EINVAL; | |
1805 | } | |
1806 | ||
1807 | /* We can only change the number of devices in raid1 with old (i.e. pre 1.0.7) metadata */ | |
1808 | if (!rt_is_raid1(rs->raid_type) && | |
1809 | (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) { | |
1810 | DMERR("Reshaping raid sets not yet supported. (device count change from %u to %u)", | |
1811 | sb->num_devices, mddev->raid_disks); | |
1812 | return -EINVAL; | |
1813 | } | |
1814 | ||
1815 | /* Table line is checked vs. authoritative superblock */ | |
1816 | rs_set_new(rs); | |
b12d437b JB |
1817 | } |
1818 | ||
4286325b | 1819 | if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) |
b12d437b JB |
1820 | mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset); |
1821 | ||
1822 | /* | |
1823 | * During load, we set FirstUse if a new superblock was written. | |
1824 | * There are two reasons we might not have a superblock: | |
33e53f06 | 1825 | * 1) The raid set is brand new - in which case, all of the |
43157840 | 1826 | * devices must have their In_sync bit set. Also, |
b12d437b | 1827 | * recovery_cp must be 0, unless forced. |
33e53f06 | 1828 | * 2) This is a new device being added to an old raid set |
b12d437b JB |
1829 | * and the new device needs to be rebuilt - in which |
1830 | * case the In_sync bit will /not/ be set and | |
1831 | * recovery_cp must be MaxSector. | |
1832 | */ | |
33e53f06 | 1833 | d = 0; |
dafb20fa | 1834 | rdev_for_each(r, mddev) { |
33e53f06 HM |
1835 | if (test_bit(FirstUse, &r->flags)) |
1836 | new_devs++; | |
1837 | ||
b12d437b | 1838 | if (!test_bit(In_sync, &r->flags)) { |
33e53f06 HM |
1839 | DMINFO("Device %d specified for rebuild; clearing superblock", |
1840 | r->raid_disk); | |
b12d437b | 1841 | rebuilds++; |
33e53f06 HM |
1842 | |
1843 | if (test_bit(FirstUse, &r->flags)) | |
1844 | rebuild_and_new++; | |
1845 | } | |
1846 | ||
1847 | d++; | |
b12d437b JB |
1848 | } |
1849 | ||
33e53f06 HM |
1850 | if (new_devs == rs->raid_disks || !rebuilds) { |
1851 | /* Replace a broken device */ | |
1852 | if (new_devs == 1 && !rs->delta_disks) | |
1853 | ; | |
1854 | if (new_devs == rs->raid_disks) { | |
1855 | DMINFO("Superblocks created for new raid set"); | |
b12d437b | 1856 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); |
4286325b | 1857 | set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); |
33e53f06 HM |
1858 | mddev->recovery_cp = 0; |
1859 | } else if (new_devs && new_devs != rs->raid_disks && !rebuilds) { | |
1860 | DMERR("New device injected into existing raid set without " | |
1861 | "'delta_disks' or 'rebuild' parameter specified"); | |
b12d437b JB |
1862 | return -EINVAL; |
1863 | } | |
33e53f06 HM |
1864 | } else if (new_devs && new_devs != rebuilds) { |
1865 | DMERR("%u 'rebuild' devices cannot be injected into" | |
1866 | " a raid set with %u other first-time devices", | |
1867 | rebuilds, new_devs); | |
b12d437b | 1868 | return -EINVAL; |
33e53f06 HM |
1869 | } else if (rebuilds) { |
1870 | if (rebuild_and_new && rebuilds != rebuild_and_new) { | |
1871 | DMERR("new device%s provided without 'rebuild'", | |
1872 | new_devs > 1 ? "s" : ""); | |
1873 | return -EINVAL; | |
1874 | } else if (mddev->recovery_cp != MaxSector) { | |
1875 | DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)", | |
1876 | (unsigned long long) mddev->recovery_cp); | |
1877 | return -EINVAL; | |
1878 | } else if (mddev->reshape_position != MaxSector) { | |
1879 | DMERR("'rebuild' specified while raid set is being reshaped"); | |
1880 | return -EINVAL; | |
1881 | } | |
b12d437b JB |
1882 | } |
1883 | ||
1884 | /* | |
1885 | * Now we set the Faulty bit for those devices that are | |
1886 | * recorded in the superblock as failed. | |
1887 | */ | |
33e53f06 | 1888 | sb_retrieve_failed_devices(sb, failed_devices); |
dafb20fa | 1889 | rdev_for_each(r, mddev) { |
b12d437b JB |
1890 | if (!r->sb_page) |
1891 | continue; | |
1892 | sb2 = page_address(r->sb_page); | |
1893 | sb2->failed_devices = 0; | |
33e53f06 | 1894 | memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices)); |
b12d437b JB |
1895 | |
1896 | /* | |
1897 | * Check for any device re-ordering. | |
1898 | */ | |
1899 | if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) { | |
1900 | role = le32_to_cpu(sb2->array_position); | |
33e53f06 HM |
1901 | if (role < 0) |
1902 | continue; | |
1903 | ||
b12d437b | 1904 | if (role != r->raid_disk) { |
e6ca5e1a MS |
1905 | if (__is_raid10_near(mddev->layout)) { |
1906 | if (mddev->raid_disks % __raid10_near_copies(mddev->layout) || | |
bd83a4c4 MS |
1907 | rs->raid_disks % rs->raid10_copies) { |
1908 | rs->ti->error = | |
1909 | "Cannot change raid10 near set to odd # of devices!"; | |
1910 | return -EINVAL; | |
1911 | } | |
33e53f06 HM |
1912 | |
1913 | sb2->array_position = cpu_to_le32(r->raid_disk); | |
1914 | ||
1915 | } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) && | |
bd83a4c4 MS |
1916 | !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) && |
1917 | !rt_is_raid1(rs->raid_type)) { | |
1918 | rs->ti->error = "Cannot change device positions in raid set"; | |
1919 | return -EINVAL; | |
1920 | } | |
33e53f06 | 1921 | |
bd83a4c4 | 1922 | DMINFO("raid device #%d now at position #%d", role, r->raid_disk); |
b12d437b JB |
1923 | } |
1924 | ||
1925 | /* | |
1926 | * Partial recovery is performed on | |
1927 | * returning failed devices. | |
1928 | */ | |
33e53f06 | 1929 | if (test_bit(role, (void *) failed_devices)) |
b12d437b JB |
1930 | set_bit(Faulty, &r->flags); |
1931 | } | |
1932 | } | |
1933 | ||
1934 | return 0; | |
1935 | } | |
1936 | ||
0cf45031 | 1937 | static int super_validate(struct raid_set *rs, struct md_rdev *rdev) |
b12d437b | 1938 | { |
0cf45031 | 1939 | struct mddev *mddev = &rs->md; |
33e53f06 HM |
1940 | struct dm_raid_superblock *sb; |
1941 | ||
3a1c1ef2 | 1942 | if (rs_is_raid0(rs) || !rdev->sb_page) |
33e53f06 HM |
1943 | return 0; |
1944 | ||
1945 | sb = page_address(rdev->sb_page); | |
b12d437b JB |
1946 | |
1947 | /* | |
1948 | * If mddev->events is not set, we know we have not yet initialized | |
1949 | * the array. | |
1950 | */ | |
33e53f06 | 1951 | if (!mddev->events && super_init_validation(rs, rdev)) |
b12d437b JB |
1952 | return -EINVAL; |
1953 | ||
9b6e5423 MS |
1954 | if (le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) { |
1955 | rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags"; | |
1956 | return -EINVAL; | |
1957 | } | |
1958 | ||
1959 | if (sb->incompat_features) { | |
ecbfb9f1 | 1960 | rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet"; |
4c9971ca HM |
1961 | return -EINVAL; |
1962 | } | |
1963 | ||
0cf45031 | 1964 | /* Enable bitmap creation for RAID levels != 0 */ |
676fa5ad | 1965 | mddev->bitmap_info.offset = rt_is_raid0(rs->raid_type) ? 0 : to_sector(4096); |
0cf45031 HM |
1966 | rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset; |
1967 | ||
33e53f06 HM |
1968 | if (!test_and_clear_bit(FirstUse, &rdev->flags)) { |
1969 | /* Retrieve device size stored in superblock to be prepared for shrink */ | |
1970 | rdev->sectors = le64_to_cpu(sb->sectors); | |
b12d437b | 1971 | rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset); |
33e53f06 HM |
1972 | if (rdev->recovery_offset == MaxSector) |
1973 | set_bit(In_sync, &rdev->flags); | |
1974 | /* | |
1975 | * If no reshape in progress -> we're recovering single | |
1976 | * disk(s) and have to set the device(s) to out-of-sync | |
1977 | */ | |
1978 | else if (rs->md.reshape_position == MaxSector) | |
1979 | clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */ | |
b12d437b JB |
1980 | } |
1981 | ||
1982 | /* | |
1983 | * If a device comes back, set it as not In_sync and no longer faulty. | |
1984 | */ | |
33e53f06 HM |
1985 | if (test_and_clear_bit(Faulty, &rdev->flags)) { |
1986 | rdev->recovery_offset = 0; | |
b12d437b JB |
1987 | clear_bit(In_sync, &rdev->flags); |
1988 | rdev->saved_raid_disk = rdev->raid_disk; | |
b12d437b JB |
1989 | } |
1990 | ||
33e53f06 HM |
1991 | /* Reshape support -> restore repective data offsets */ |
1992 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
1993 | rdev->new_data_offset = le64_to_cpu(sb->new_data_offset); | |
b12d437b JB |
1994 | |
1995 | return 0; | |
1996 | } | |
1997 | ||
1998 | /* | |
1999 | * Analyse superblocks and select the freshest. | |
2000 | */ | |
2001 | static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs) | |
2002 | { | |
73c6f239 | 2003 | int r; |
0447568f | 2004 | struct raid_dev *dev; |
a9ad8526 | 2005 | struct md_rdev *rdev, *tmp, *freshest; |
fd01b88c | 2006 | struct mddev *mddev = &rs->md; |
b12d437b JB |
2007 | |
2008 | freshest = NULL; | |
a9ad8526 | 2009 | rdev_for_each_safe(rdev, tmp, mddev) { |
761becff | 2010 | /* |
c76d53f4 | 2011 | * Skipping super_load due to CTR_FLAG_SYNC will cause |
761becff | 2012 | * the array to undergo initialization again as |
43157840 | 2013 | * though it were new. This is the intended effect |
761becff JB |
2014 | * of the "sync" directive. |
2015 | * | |
2016 | * When reshaping capability is added, we must ensure | |
2017 | * that the "sync" directive is disallowed during the | |
2018 | * reshape. | |
2019 | */ | |
4286325b | 2020 | if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) |
761becff JB |
2021 | continue; |
2022 | ||
b12d437b JB |
2023 | if (!rdev->meta_bdev) |
2024 | continue; | |
2025 | ||
73c6f239 | 2026 | r = super_load(rdev, freshest); |
b12d437b | 2027 | |
73c6f239 | 2028 | switch (r) { |
b12d437b JB |
2029 | case 1: |
2030 | freshest = rdev; | |
2031 | break; | |
2032 | case 0: | |
2033 | break; | |
2034 | default: | |
0447568f | 2035 | dev = container_of(rdev, struct raid_dev, rdev); |
55ebbb59 JB |
2036 | if (dev->meta_dev) |
2037 | dm_put_device(ti, dev->meta_dev); | |
0447568f | 2038 | |
55ebbb59 JB |
2039 | dev->meta_dev = NULL; |
2040 | rdev->meta_bdev = NULL; | |
0447568f | 2041 | |
55ebbb59 JB |
2042 | if (rdev->sb_page) |
2043 | put_page(rdev->sb_page); | |
0447568f | 2044 | |
55ebbb59 | 2045 | rdev->sb_page = NULL; |
0447568f | 2046 | |
55ebbb59 | 2047 | rdev->sb_loaded = 0; |
0447568f | 2048 | |
55ebbb59 JB |
2049 | /* |
2050 | * We might be able to salvage the data device | |
2051 | * even though the meta device has failed. For | |
2052 | * now, we behave as though '- -' had been | |
2053 | * set for this device in the table. | |
2054 | */ | |
2055 | if (dev->data_dev) | |
2056 | dm_put_device(ti, dev->data_dev); | |
0447568f | 2057 | |
55ebbb59 JB |
2058 | dev->data_dev = NULL; |
2059 | rdev->bdev = NULL; | |
0447568f | 2060 | |
55ebbb59 | 2061 | list_del(&rdev->same_set); |
b12d437b JB |
2062 | } |
2063 | } | |
2064 | ||
2065 | if (!freshest) | |
2066 | return 0; | |
2067 | ||
bd83a4c4 MS |
2068 | if (validate_raid_redundancy(rs)) { |
2069 | rs->ti->error = "Insufficient redundancy to activate array"; | |
2070 | return -EINVAL; | |
2071 | } | |
55ebbb59 | 2072 | |
b12d437b JB |
2073 | /* |
2074 | * Validation of the freshest device provides the source of | |
2075 | * validation for the remaining devices. | |
2076 | */ | |
bd83a4c4 MS |
2077 | if (super_validate(rs, freshest)) { |
2078 | rs->ti->error = "Unable to assemble array: Invalid superblocks"; | |
2079 | return -EINVAL; | |
2080 | } | |
b12d437b | 2081 | |
dafb20fa | 2082 | rdev_for_each(rdev, mddev) |
0cf45031 | 2083 | if ((rdev != freshest) && super_validate(rs, rdev)) |
b12d437b JB |
2084 | return -EINVAL; |
2085 | ||
2086 | return 0; | |
2087 | } | |
2088 | ||
ecbfb9f1 | 2089 | /* Userpace reordered disks -> adjust raid_disk indexes in @rs */ |
e6ca5e1a | 2090 | static void __reorder_raid_disk_indexes(struct raid_set *rs) |
ecbfb9f1 HM |
2091 | { |
2092 | int i = 0; | |
2093 | struct md_rdev *rdev; | |
2094 | ||
2095 | rdev_for_each(rdev, &rs->md) { | |
2096 | rdev->raid_disk = i++; | |
2097 | rdev->saved_raid_disk = rdev->new_raid_disk = -1; | |
2098 | } | |
2099 | } | |
2100 | ||
2101 | /* | |
2102 | * Setup @rs for takeover by a different raid level | |
2103 | */ | |
2104 | static int rs_setup_takeover(struct raid_set *rs) | |
2105 | { | |
2106 | struct mddev *mddev = &rs->md; | |
2107 | struct md_rdev *rdev; | |
2108 | unsigned int d = mddev->raid_disks = rs->raid_disks; | |
2109 | sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset; | |
2110 | ||
2111 | if (rt_is_raid10(rs->raid_type)) { | |
2112 | if (mddev->level == 0) { | |
2113 | /* Userpace reordered disks -> adjust raid_disk indexes */ | |
e6ca5e1a | 2114 | __reorder_raid_disk_indexes(rs); |
ecbfb9f1 HM |
2115 | |
2116 | /* raid0 -> raid10_far layout */ | |
2117 | mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR, | |
2118 | rs->raid10_copies); | |
2119 | } else if (mddev->level == 1) | |
2120 | /* raid1 -> raid10_near layout */ | |
2121 | mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR, | |
2122 | rs->raid_disks); | |
2123 | else | |
2124 | return -EINVAL; | |
2125 | ||
2126 | } | |
2127 | ||
2128 | clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags); | |
2129 | mddev->recovery_cp = MaxSector; | |
2130 | ||
2131 | while (d--) { | |
2132 | rdev = &rs->dev[d].rdev; | |
2133 | ||
2134 | if (test_bit(d, (void *) rs->rebuild_disks)) { | |
2135 | clear_bit(In_sync, &rdev->flags); | |
2136 | clear_bit(Faulty, &rdev->flags); | |
2137 | mddev->recovery_cp = rdev->recovery_offset = 0; | |
2138 | /* Bitmap has to be created when we do an "up" takeover */ | |
2139 | set_bit(MD_ARRAY_FIRST_USE, &mddev->flags); | |
2140 | } | |
2141 | ||
2142 | rdev->new_data_offset = new_data_offset; | |
2143 | } | |
2144 | ||
ecbfb9f1 HM |
2145 | return 0; |
2146 | } | |
2147 | ||
75b8e04b | 2148 | /* |
48cf06bc HM |
2149 | * Enable/disable discard support on RAID set depending on |
2150 | * RAID level and discard properties of underlying RAID members. | |
75b8e04b | 2151 | */ |
ecbfb9f1 | 2152 | static void configure_discard_support(struct raid_set *rs) |
75b8e04b | 2153 | { |
48cf06bc HM |
2154 | int i; |
2155 | bool raid456; | |
ecbfb9f1 | 2156 | struct dm_target *ti = rs->ti; |
48cf06bc | 2157 | |
75b8e04b HM |
2158 | /* Assume discards not supported until after checks below. */ |
2159 | ti->discards_supported = false; | |
2160 | ||
2161 | /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */ | |
48cf06bc | 2162 | raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6); |
75b8e04b | 2163 | |
48cf06bc | 2164 | for (i = 0; i < rs->md.raid_disks; i++) { |
d20c4b08 | 2165 | struct request_queue *q; |
48cf06bc | 2166 | |
d20c4b08 HM |
2167 | if (!rs->dev[i].rdev.bdev) |
2168 | continue; | |
2169 | ||
2170 | q = bdev_get_queue(rs->dev[i].rdev.bdev); | |
48cf06bc HM |
2171 | if (!q || !blk_queue_discard(q)) |
2172 | return; | |
2173 | ||
2174 | if (raid456) { | |
2175 | if (!q->limits.discard_zeroes_data) | |
2176 | return; | |
2177 | if (!devices_handle_discard_safely) { | |
2178 | DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty."); | |
2179 | DMERR("Set dm-raid.devices_handle_discard_safely=Y to override."); | |
2180 | return; | |
2181 | } | |
2182 | } | |
2183 | } | |
2184 | ||
2185 | /* All RAID members properly support discards */ | |
75b8e04b HM |
2186 | ti->discards_supported = true; |
2187 | ||
2188 | /* | |
2189 | * RAID1 and RAID10 personalities require bio splitting, | |
48cf06bc | 2190 | * RAID0/4/5/6 don't and process large discard bios properly. |
75b8e04b | 2191 | */ |
48cf06bc | 2192 | ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10); |
75b8e04b HM |
2193 | ti->num_discard_bios = 1; |
2194 | } | |
2195 | ||
9d09e663 | 2196 | /* |
73c6f239 | 2197 | * Construct a RAID0/1/10/4/5/6 mapping: |
9d09e663 | 2198 | * Args: |
43157840 MS |
2199 | * <raid_type> <#raid_params> <raid_params>{0,} \ |
2200 | * <#raid_devs> [<meta_dev1> <dev1>]{1,} | |
9d09e663 | 2201 | * |
43157840 | 2202 | * <raid_params> varies by <raid_type>. See 'parse_raid_params' for |
9d09e663 | 2203 | * details on possible <raid_params>. |
73c6f239 HM |
2204 | * |
2205 | * Userspace is free to initialize the metadata devices, hence the superblocks to | |
2206 | * enforce recreation based on the passed in table parameters. | |
2207 | * | |
9d09e663 N |
2208 | */ |
2209 | static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv) | |
2210 | { | |
73c6f239 | 2211 | int r; |
9d09e663 | 2212 | struct raid_type *rt; |
92c83d79 | 2213 | unsigned num_raid_params, num_raid_devs; |
9d09e663 | 2214 | struct raid_set *rs = NULL; |
92c83d79 HM |
2215 | const char *arg; |
2216 | struct dm_arg_set as = { argc, argv }, as_nrd; | |
2217 | struct dm_arg _args[] = { | |
2218 | { 0, as.argc, "Cannot understand number of raid parameters" }, | |
2219 | { 1, 254, "Cannot understand number of raid devices parameters" } | |
2220 | }; | |
2221 | ||
2222 | /* Must have <raid_type> */ | |
2223 | arg = dm_shift_arg(&as); | |
bd83a4c4 MS |
2224 | if (!arg) { |
2225 | ti->error = "No arguments"; | |
2226 | return -EINVAL; | |
2227 | } | |
9d09e663 | 2228 | |
92c83d79 | 2229 | rt = get_raid_type(arg); |
bd83a4c4 MS |
2230 | if (!rt) { |
2231 | ti->error = "Unrecognised raid_type"; | |
2232 | return -EINVAL; | |
2233 | } | |
9d09e663 | 2234 | |
92c83d79 HM |
2235 | /* Must have <#raid_params> */ |
2236 | if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error)) | |
43157840 | 2237 | return -EINVAL; |
9d09e663 | 2238 | |
92c83d79 HM |
2239 | /* number of raid device tupples <meta_dev data_dev> */ |
2240 | as_nrd = as; | |
2241 | dm_consume_args(&as_nrd, num_raid_params); | |
2242 | _args[1].max = (as_nrd.argc - 1) / 2; | |
2243 | if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error)) | |
43157840 | 2244 | return -EINVAL; |
9d09e663 | 2245 | |
bb91a63f | 2246 | if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) { |
bd83a4c4 MS |
2247 | ti->error = "Invalid number of supplied raid devices"; |
2248 | return -EINVAL; | |
2249 | } | |
3ca5a21a | 2250 | |
bfcee0e3 | 2251 | rs = raid_set_alloc(ti, rt, num_raid_devs); |
9d09e663 N |
2252 | if (IS_ERR(rs)) |
2253 | return PTR_ERR(rs); | |
2254 | ||
92c83d79 | 2255 | r = parse_raid_params(rs, &as, num_raid_params); |
73c6f239 | 2256 | if (r) |
9d09e663 N |
2257 | goto bad; |
2258 | ||
702108d1 | 2259 | r = parse_dev_params(rs, &as); |
73c6f239 | 2260 | if (r) |
9d09e663 N |
2261 | goto bad; |
2262 | ||
b12d437b | 2263 | rs->md.sync_super = super_sync; |
ecbfb9f1 HM |
2264 | |
2265 | /* | |
2266 | * Backup any new raid set level, layout, ... | |
2267 | * requested to be able to compare to superblock | |
2268 | * members for conversion decisions. | |
2269 | */ | |
2270 | rs_config_backup(rs); | |
2271 | ||
73c6f239 HM |
2272 | r = analyse_superblocks(ti, rs); |
2273 | if (r) | |
b12d437b JB |
2274 | goto bad; |
2275 | ||
9d09e663 | 2276 | INIT_WORK(&rs->md.event_work, do_table_event); |
9d09e663 | 2277 | ti->private = rs; |
55a62eef | 2278 | ti->num_flush_bios = 1; |
9d09e663 | 2279 | |
ecbfb9f1 HM |
2280 | /* Restore any requested new layout for conversion decision */ |
2281 | rs_config_restore(rs); | |
2282 | ||
75b8e04b | 2283 | /* |
ecbfb9f1 HM |
2284 | * If a takeover is needed, just set the level to |
2285 | * the new requested one and allow the raid set to run. | |
75b8e04b | 2286 | */ |
ecbfb9f1 HM |
2287 | if (rs_takeover_requested(rs)) { |
2288 | r = rs_check_takeover(rs); | |
2289 | if (r) | |
2290 | return r; | |
2291 | ||
2292 | r = rs_setup_takeover(rs); | |
2293 | if (r) | |
2294 | return r; | |
2295 | ||
3a1c1ef2 | 2296 | /* Tell preresume to update superblocks with new layout */ |
4286325b | 2297 | set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags); |
3a1c1ef2 HM |
2298 | rs_set_new(rs); |
2299 | } else | |
2300 | rs_set_cur(rs); | |
ecbfb9f1 HM |
2301 | |
2302 | /* Start raid set read-only and assumed clean to change in raid_resume() */ | |
2303 | rs->md.ro = 1; | |
2304 | rs->md.in_sync = 1; | |
2305 | set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery); | |
75b8e04b | 2306 | |
0cf45031 HM |
2307 | /* Has to be held on running the array */ |
2308 | mddev_lock_nointr(&rs->md); | |
73c6f239 | 2309 | r = md_run(&rs->md); |
9d09e663 | 2310 | rs->md.in_sync = 0; /* Assume already marked dirty */ |
0cf45031 | 2311 | mddev_unlock(&rs->md); |
9d09e663 | 2312 | |
73c6f239 | 2313 | if (r) { |
9d09e663 N |
2314 | ti->error = "Fail to run raid array"; |
2315 | goto bad; | |
2316 | } | |
2317 | ||
63f33b8d | 2318 | if (ti->len != rs->md.array_sectors) { |
bd83a4c4 MS |
2319 | ti->error = "Array size does not match requested target length"; |
2320 | r = -EINVAL; | |
63f33b8d JB |
2321 | goto size_mismatch; |
2322 | } | |
9d09e663 | 2323 | rs->callbacks.congested_fn = raid_is_congested; |
9d09e663 N |
2324 | dm_table_add_target_callbacks(ti->table, &rs->callbacks); |
2325 | ||
32737279 | 2326 | mddev_suspend(&rs->md); |
9d09e663 N |
2327 | return 0; |
2328 | ||
63f33b8d JB |
2329 | size_mismatch: |
2330 | md_stop(&rs->md); | |
9d09e663 | 2331 | bad: |
bfcee0e3 | 2332 | raid_set_free(rs); |
9d09e663 | 2333 | |
73c6f239 | 2334 | return r; |
9d09e663 N |
2335 | } |
2336 | ||
2337 | static void raid_dtr(struct dm_target *ti) | |
2338 | { | |
2339 | struct raid_set *rs = ti->private; | |
2340 | ||
2341 | list_del_init(&rs->callbacks.list); | |
2342 | md_stop(&rs->md); | |
bfcee0e3 | 2343 | raid_set_free(rs); |
9d09e663 N |
2344 | } |
2345 | ||
7de3ee57 | 2346 | static int raid_map(struct dm_target *ti, struct bio *bio) |
9d09e663 N |
2347 | { |
2348 | struct raid_set *rs = ti->private; | |
fd01b88c | 2349 | struct mddev *mddev = &rs->md; |
9d09e663 N |
2350 | |
2351 | mddev->pers->make_request(mddev, bio); | |
2352 | ||
2353 | return DM_MAPIO_SUBMITTED; | |
2354 | } | |
2355 | ||
3a1c1ef2 | 2356 | /* Return string describing the current sync action of @mddev */ |
be83651f JB |
2357 | static const char *decipher_sync_action(struct mddev *mddev) |
2358 | { | |
2359 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
2360 | return "frozen"; | |
2361 | ||
2362 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2363 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { | |
2364 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
2365 | return "reshape"; | |
2366 | ||
2367 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
2368 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
2369 | return "resync"; | |
2370 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2371 | return "check"; | |
2372 | return "repair"; | |
2373 | } | |
2374 | ||
2375 | if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) | |
2376 | return "recover"; | |
2377 | } | |
2378 | ||
2379 | return "idle"; | |
2380 | } | |
2381 | ||
3a1c1ef2 HM |
2382 | /* |
2383 | * Return status string @rdev | |
2384 | * | |
2385 | * Status characters: | |
2386 | * | |
2387 | * 'D' = Dead/Failed device | |
2388 | * 'a' = Alive but not in-sync | |
2389 | * 'A' = Alive and in-sync | |
2390 | */ | |
e6ca5e1a | 2391 | static const char *__raid_dev_status(struct md_rdev *rdev, bool array_in_sync) |
9d09e663 | 2392 | { |
3a1c1ef2 HM |
2393 | if (test_bit(Faulty, &rdev->flags)) |
2394 | return "D"; | |
2395 | else if (!array_in_sync || !test_bit(In_sync, &rdev->flags)) | |
2396 | return "a"; | |
2397 | else | |
2398 | return "A"; | |
2399 | } | |
9d09e663 | 2400 | |
3a1c1ef2 HM |
2401 | /* Helper to return resync/reshape progress for @rs and @array_in_sync */ |
2402 | static sector_t rs_get_progress(struct raid_set *rs, | |
2403 | sector_t resync_max_sectors, bool *array_in_sync) | |
2404 | { | |
2405 | sector_t r, recovery_cp, curr_resync_completed; | |
2406 | struct mddev *mddev = &rs->md; | |
9d09e663 | 2407 | |
3a1c1ef2 HM |
2408 | curr_resync_completed = mddev->curr_resync_completed ?: mddev->recovery_cp; |
2409 | recovery_cp = mddev->recovery_cp; | |
2410 | *array_in_sync = false; | |
2411 | ||
2412 | if (rs_is_raid0(rs)) { | |
2413 | r = resync_max_sectors; | |
2414 | *array_in_sync = true; | |
2415 | ||
2416 | } else { | |
2417 | r = mddev->reshape_position; | |
2418 | ||
2419 | /* Reshape is relative to the array size */ | |
2420 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || | |
2421 | r != MaxSector) { | |
2422 | if (r == MaxSector) { | |
2423 | *array_in_sync = true; | |
2424 | r = resync_max_sectors; | |
0cf45031 | 2425 | } else { |
3a1c1ef2 HM |
2426 | /* Got to reverse on backward reshape */ |
2427 | if (mddev->reshape_backwards) | |
2428 | r = mddev->array_sectors - r; | |
2429 | ||
2430 | /* Devide by # of data stripes */ | |
2431 | sector_div(r, mddev_data_stripes(rs)); | |
0cf45031 | 2432 | } |
3a1c1ef2 HM |
2433 | |
2434 | /* Sync is relative to the component device size */ | |
2435 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
2436 | r = curr_resync_completed; | |
2437 | else | |
2438 | r = recovery_cp; | |
2439 | ||
2440 | if (r == MaxSector) { | |
2441 | /* | |
2442 | * Sync complete. | |
2443 | */ | |
2444 | *array_in_sync = true; | |
2445 | r = resync_max_sectors; | |
2446 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
2447 | /* | |
2448 | * If "check" or "repair" is occurring, the raid set has | |
2449 | * undergone an initial sync and the health characters | |
2450 | * should not be 'a' anymore. | |
2451 | */ | |
2452 | *array_in_sync = true; | |
0cf45031 | 2453 | } else { |
3a1c1ef2 | 2454 | struct md_rdev *rdev; |
be83651f | 2455 | |
3a1c1ef2 HM |
2456 | /* |
2457 | * The raid set may be doing an initial sync, or it may | |
43157840 | 2458 | * be rebuilding individual components. If all the |
3a1c1ef2 HM |
2459 | * devices are In_sync, then it is the raid set that is |
2460 | * being initialized. | |
2461 | */ | |
2462 | rdev_for_each(rdev, mddev) | |
2463 | if (!test_bit(In_sync, &rdev->flags)) | |
2464 | *array_in_sync = true; | |
2465 | #if 0 | |
2466 | r = 0; /* HM FIXME: TESTME: https://bugzilla.redhat.com/show_bug.cgi?id=1210637 ? */ | |
2467 | #endif | |
2e727c3c | 2468 | } |
3a1c1ef2 HM |
2469 | } |
2470 | ||
2471 | return r; | |
2472 | } | |
2473 | ||
2474 | /* Helper to return @dev name or "-" if !@dev */ | |
e6ca5e1a | 2475 | static const char *__get_dev_name(struct dm_dev *dev) |
3a1c1ef2 HM |
2476 | { |
2477 | return dev ? dev->name : "-"; | |
2478 | } | |
2479 | ||
2480 | static void raid_status(struct dm_target *ti, status_type_t type, | |
2481 | unsigned int status_flags, char *result, unsigned int maxlen) | |
2482 | { | |
2483 | struct raid_set *rs = ti->private; | |
2484 | struct mddev *mddev = &rs->md; | |
2485 | struct r5conf *conf = mddev->private; | |
2486 | int max_nr_stripes = conf ? conf->max_nr_stripes : 0; | |
2487 | bool array_in_sync; | |
2488 | unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */ | |
2489 | unsigned int sz = 0; | |
2490 | unsigned int write_mostly_params = 0; | |
2491 | sector_t progress, resync_max_sectors, resync_mismatches; | |
2492 | const char *sync_action; | |
2493 | struct raid_type *rt; | |
2494 | struct md_rdev *rdev; | |
2495 | ||
2496 | switch (type) { | |
2497 | case STATUSTYPE_INFO: | |
2498 | /* *Should* always succeed */ | |
2499 | rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout); | |
2500 | if (!rt) | |
2501 | return; | |
2502 | ||
2503 | DMEMIT("%s %d ", rt ? rt->name : "unknown", mddev->raid_disks); | |
2504 | ||
2505 | /* Access most recent mddev properties for status output */ | |
2506 | smp_rmb(); | |
2507 | /* Get sensible max sectors even if raid set not yet started */ | |
4286325b | 2508 | resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ? |
3a1c1ef2 HM |
2509 | mddev->resync_max_sectors : mddev->dev_sectors; |
2510 | progress = rs_get_progress(rs, resync_max_sectors, &array_in_sync); | |
2511 | resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ? | |
2512 | (unsigned int) atomic64_read(&mddev->resync_mismatches) : 0; | |
2513 | sync_action = decipher_sync_action(&rs->md); | |
2514 | ||
2515 | /* HM FIXME: do we want another state char for raid0? It shows 'D' or 'A' now */ | |
2516 | rdev_for_each(rdev, mddev) | |
e6ca5e1a | 2517 | DMEMIT(__raid_dev_status(rdev, array_in_sync)); |
9d09e663 | 2518 | |
2e727c3c | 2519 | /* |
3a1c1ef2 | 2520 | * In-sync/Reshape ratio: |
2e727c3c | 2521 | * The in-sync ratio shows the progress of: |
3a1c1ef2 HM |
2522 | * - Initializing the raid set |
2523 | * - Rebuilding a subset of devices of the raid set | |
2e727c3c JB |
2524 | * The user can distinguish between the two by referring |
2525 | * to the status characters. | |
3a1c1ef2 HM |
2526 | * |
2527 | * The reshape ratio shows the progress of | |
2528 | * changing the raid layout or the number of | |
2529 | * disks of a raid set | |
2e727c3c | 2530 | */ |
3a1c1ef2 HM |
2531 | DMEMIT(" %llu/%llu", (unsigned long long) progress, |
2532 | (unsigned long long) resync_max_sectors); | |
9d09e663 | 2533 | |
be83651f | 2534 | /* |
3a1c1ef2 HM |
2535 | * v1.5.0+: |
2536 | * | |
be83651f | 2537 | * Sync action: |
3a1c1ef2 | 2538 | * See Documentation/device-mapper/dm-raid.txt for |
be83651f JB |
2539 | * information on each of these states. |
2540 | */ | |
3a1c1ef2 | 2541 | DMEMIT(" %s", sync_action); |
be83651f JB |
2542 | |
2543 | /* | |
3a1c1ef2 HM |
2544 | * v1.5.0+: |
2545 | * | |
be83651f JB |
2546 | * resync_mismatches/mismatch_cnt |
2547 | * This field shows the number of discrepancies found when | |
3a1c1ef2 | 2548 | * performing a "check" of the raid set. |
be83651f | 2549 | */ |
3a1c1ef2 | 2550 | DMEMIT(" %llu", (unsigned long long) resync_mismatches); |
9d09e663 | 2551 | |
3a1c1ef2 | 2552 | /* |
9b6e5423 | 2553 | * v1.9.0+: |
3a1c1ef2 HM |
2554 | * |
2555 | * data_offset (needed for out of space reshaping) | |
2556 | * This field shows the data offset into the data | |
2557 | * image LV where the first stripes data starts. | |
2558 | * | |
2559 | * We keep data_offset equal on all raid disks of the set, | |
2560 | * so retrieving it from the first raid disk is sufficient. | |
2561 | */ | |
2562 | DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset); | |
2563 | break; | |
9d09e663 | 2564 | |
3a1c1ef2 HM |
2565 | case STATUSTYPE_TABLE: |
2566 | /* Report the table line string you would use to construct this raid set */ | |
2567 | ||
2568 | /* Calculate raid parameter count */ | |
2569 | rdev_for_each(rdev, mddev) | |
2570 | if (test_bit(WriteMostly, &rdev->flags)) | |
2571 | write_mostly_params += 2; | |
2572 | raid_param_cnt += memweight(rs->rebuild_disks, | |
2573 | DISKS_ARRAY_ELEMS * sizeof(*rs->rebuild_disks)) * 2 + | |
2574 | write_mostly_params + | |
2575 | hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) + | |
2576 | hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2; | |
2577 | /* Emit table line */ | |
2578 | DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors); | |
4286325b | 2579 | if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) |
3fa6cf38 | 2580 | DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT), |
3a1c1ef2 | 2581 | raid10_md_layout_to_format(mddev->layout)); |
4286325b | 2582 | if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) |
3fa6cf38 | 2583 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES), |
3a1c1ef2 | 2584 | raid10_md_layout_to_copies(mddev->layout)); |
4286325b | 2585 | if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) |
3fa6cf38 | 2586 | DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC)); |
4286325b | 2587 | if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) |
3fa6cf38 | 2588 | DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC)); |
4286325b | 2589 | if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) |
3fa6cf38 | 2590 | DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE), |
3a1c1ef2 | 2591 | (unsigned long long) to_sector(mddev->bitmap_info.chunksize)); |
4286325b | 2592 | if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) |
3fa6cf38 | 2593 | DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET), |
3a1c1ef2 | 2594 | (unsigned long long) rs->data_offset); |
4286325b | 2595 | if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) |
3fa6cf38 | 2596 | DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP), |
3a1c1ef2 | 2597 | mddev->bitmap_info.daemon_sleep); |
4286325b | 2598 | if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) |
3fa6cf38 | 2599 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS), |
3a1c1ef2 | 2600 | mddev->delta_disks); |
4286325b | 2601 | if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) |
3fa6cf38 | 2602 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE), |
3a1c1ef2 HM |
2603 | max_nr_stripes); |
2604 | rdev_for_each(rdev, mddev) | |
2605 | if (test_bit(rdev->raid_disk, (void *) rs->rebuild_disks)) | |
3fa6cf38 | 2606 | DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD), |
3a1c1ef2 HM |
2607 | rdev->raid_disk); |
2608 | rdev_for_each(rdev, mddev) | |
2609 | if (test_bit(WriteMostly, &rdev->flags)) | |
3fa6cf38 | 2610 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY), |
3a1c1ef2 | 2611 | rdev->raid_disk); |
4286325b | 2612 | if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) |
3fa6cf38 | 2613 | DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND), |
3a1c1ef2 | 2614 | mddev->bitmap_info.max_write_behind); |
4286325b | 2615 | if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags)) |
3fa6cf38 | 2616 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE), |
3a1c1ef2 | 2617 | mddev->sync_speed_max); |
4286325b | 2618 | if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) |
3fa6cf38 | 2619 | DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE), |
3a1c1ef2 HM |
2620 | mddev->sync_speed_min); |
2621 | DMEMIT(" %d", rs->raid_disks); | |
2622 | rdev_for_each(rdev, mddev) { | |
2623 | struct raid_dev *rd = container_of(rdev, struct raid_dev, rdev); | |
2624 | ||
e6ca5e1a MS |
2625 | DMEMIT(" %s %s", __get_dev_name(rd->meta_dev), |
2626 | __get_dev_name(rd->data_dev)); | |
9d09e663 N |
2627 | } |
2628 | } | |
9d09e663 N |
2629 | } |
2630 | ||
be83651f JB |
2631 | static int raid_message(struct dm_target *ti, unsigned argc, char **argv) |
2632 | { | |
2633 | struct raid_set *rs = ti->private; | |
2634 | struct mddev *mddev = &rs->md; | |
2635 | ||
2636 | if (!strcasecmp(argv[0], "reshape")) { | |
2637 | DMERR("Reshape not supported."); | |
2638 | return -EINVAL; | |
2639 | } | |
2640 | ||
2641 | if (!mddev->pers || !mddev->pers->sync_request) | |
2642 | return -EINVAL; | |
2643 | ||
2644 | if (!strcasecmp(argv[0], "frozen")) | |
2645 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
2646 | else | |
2647 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
2648 | ||
2649 | if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) { | |
2650 | if (mddev->sync_thread) { | |
2651 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2652 | md_reap_sync_thread(mddev); | |
2653 | } | |
2654 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2655 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
2656 | return -EBUSY; | |
2657 | else if (!strcasecmp(argv[0], "resync")) | |
3a1c1ef2 HM |
2658 | ; /* MD_RECOVERY_NEEDED set below */ |
2659 | else if (!strcasecmp(argv[0], "recover")) | |
be83651f | 2660 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
3a1c1ef2 | 2661 | else { |
be83651f JB |
2662 | if (!strcasecmp(argv[0], "check")) |
2663 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
2664 | else if (!!strcasecmp(argv[0], "repair")) | |
2665 | return -EINVAL; | |
2666 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
2667 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
2668 | } | |
2669 | if (mddev->ro == 2) { | |
2670 | /* A write to sync_action is enough to justify | |
2671 | * canceling read-auto mode | |
2672 | */ | |
2673 | mddev->ro = 0; | |
3a1c1ef2 | 2674 | if (!mddev->suspended && mddev->sync_thread) |
be83651f JB |
2675 | md_wakeup_thread(mddev->sync_thread); |
2676 | } | |
2677 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3a1c1ef2 | 2678 | if (!mddev->suspended && mddev->thread) |
be83651f JB |
2679 | md_wakeup_thread(mddev->thread); |
2680 | ||
2681 | return 0; | |
2682 | } | |
2683 | ||
2684 | static int raid_iterate_devices(struct dm_target *ti, | |
2685 | iterate_devices_callout_fn fn, void *data) | |
9d09e663 N |
2686 | { |
2687 | struct raid_set *rs = ti->private; | |
2688 | unsigned i; | |
73c6f239 | 2689 | int r = 0; |
9d09e663 | 2690 | |
73c6f239 | 2691 | for (i = 0; !r && i < rs->md.raid_disks; i++) |
9d09e663 | 2692 | if (rs->dev[i].data_dev) |
73c6f239 | 2693 | r = fn(ti, |
9d09e663 N |
2694 | rs->dev[i].data_dev, |
2695 | 0, /* No offset on data devs */ | |
2696 | rs->md.dev_sectors, | |
2697 | data); | |
2698 | ||
73c6f239 | 2699 | return r; |
9d09e663 N |
2700 | } |
2701 | ||
2702 | static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
2703 | { | |
2704 | struct raid_set *rs = ti->private; | |
2705 | unsigned chunk_size = rs->md.chunk_sectors << 9; | |
d1688a6d | 2706 | struct r5conf *conf = rs->md.private; |
9d09e663 N |
2707 | |
2708 | blk_limits_io_min(limits, chunk_size); | |
2709 | blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded)); | |
2710 | } | |
2711 | ||
2712 | static void raid_presuspend(struct dm_target *ti) | |
2713 | { | |
2714 | struct raid_set *rs = ti->private; | |
2715 | ||
2716 | md_stop_writes(&rs->md); | |
2717 | } | |
2718 | ||
2719 | static void raid_postsuspend(struct dm_target *ti) | |
2720 | { | |
2721 | struct raid_set *rs = ti->private; | |
2722 | ||
2723 | mddev_suspend(&rs->md); | |
2724 | } | |
2725 | ||
f381e71b | 2726 | static void attempt_restore_of_faulty_devices(struct raid_set *rs) |
9d09e663 | 2727 | { |
9092c02d JB |
2728 | int i; |
2729 | uint64_t failed_devices, cleared_failed_devices = 0; | |
2730 | unsigned long flags; | |
2731 | struct dm_raid_superblock *sb; | |
9092c02d | 2732 | struct md_rdev *r; |
9d09e663 | 2733 | |
f381e71b JB |
2734 | for (i = 0; i < rs->md.raid_disks; i++) { |
2735 | r = &rs->dev[i].rdev; | |
2736 | if (test_bit(Faulty, &r->flags) && r->sb_page && | |
796a5cf0 MC |
2737 | sync_page_io(r, 0, r->sb_size, r->sb_page, REQ_OP_READ, 0, |
2738 | 1)) { | |
f381e71b JB |
2739 | DMINFO("Faulty %s device #%d has readable super block." |
2740 | " Attempting to revive it.", | |
2741 | rs->raid_type->name, i); | |
a4dc163a JB |
2742 | |
2743 | /* | |
2744 | * Faulty bit may be set, but sometimes the array can | |
2745 | * be suspended before the personalities can respond | |
2746 | * by removing the device from the array (i.e. calling | |
43157840 | 2747 | * 'hot_remove_disk'). If they haven't yet removed |
a4dc163a JB |
2748 | * the failed device, its 'raid_disk' number will be |
2749 | * '>= 0' - meaning we must call this function | |
2750 | * ourselves. | |
2751 | */ | |
2752 | if ((r->raid_disk >= 0) && | |
2753 | (r->mddev->pers->hot_remove_disk(r->mddev, r) != 0)) | |
2754 | /* Failed to revive this device, try next */ | |
2755 | continue; | |
2756 | ||
f381e71b JB |
2757 | r->raid_disk = i; |
2758 | r->saved_raid_disk = i; | |
2759 | flags = r->flags; | |
2760 | clear_bit(Faulty, &r->flags); | |
2761 | clear_bit(WriteErrorSeen, &r->flags); | |
2762 | clear_bit(In_sync, &r->flags); | |
2763 | if (r->mddev->pers->hot_add_disk(r->mddev, r)) { | |
2764 | r->raid_disk = -1; | |
2765 | r->saved_raid_disk = -1; | |
2766 | r->flags = flags; | |
2767 | } else { | |
2768 | r->recovery_offset = 0; | |
2769 | cleared_failed_devices |= 1 << i; | |
2770 | } | |
2771 | } | |
2772 | } | |
2773 | if (cleared_failed_devices) { | |
2774 | rdev_for_each(r, &rs->md) { | |
2775 | sb = page_address(r->sb_page); | |
2776 | failed_devices = le64_to_cpu(sb->failed_devices); | |
2777 | failed_devices &= ~cleared_failed_devices; | |
2778 | sb->failed_devices = cpu_to_le64(failed_devices); | |
2779 | } | |
2780 | } | |
2781 | } | |
2782 | ||
e6ca5e1a | 2783 | static int __load_dirty_region_bitmap(struct raid_set *rs) |
ecbfb9f1 HM |
2784 | { |
2785 | int r = 0; | |
2786 | ||
2787 | /* Try loading the bitmap unless "raid0", which does not have one */ | |
2788 | if (!rs_is_raid0(rs) && | |
4286325b | 2789 | !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) { |
ecbfb9f1 HM |
2790 | r = bitmap_load(&rs->md); |
2791 | if (r) | |
2792 | DMERR("Failed to load bitmap"); | |
2793 | } | |
2794 | ||
2795 | return r; | |
2796 | } | |
2797 | ||
2798 | static int raid_preresume(struct dm_target *ti) | |
2799 | { | |
2800 | struct raid_set *rs = ti->private; | |
2801 | struct mddev *mddev = &rs->md; | |
2802 | ||
2803 | /* This is a resume after a suspend of the set -> it's already started */ | |
4286325b | 2804 | if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags)) |
ecbfb9f1 HM |
2805 | return 0; |
2806 | ||
2807 | /* | |
2808 | * The superblocks need to be updated on disk if the | |
e6ca5e1a | 2809 | * array is new or __load_dirty_region_bitmap will overwrite them |
ecbfb9f1 HM |
2810 | * in core with old data. |
2811 | * | |
2812 | * In case the array got modified (takeover/reshape/resize) | |
2813 | * or the data offsets on the component devices changed, they | |
2814 | * have to be updated as well. | |
2815 | * | |
2816 | * Have to switch to readwrite and back in order to | |
2817 | * allow for the superblock updates. | |
2818 | */ | |
4286325b | 2819 | if (test_and_clear_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags)) { |
ecbfb9f1 HM |
2820 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
2821 | mddev->ro = 0; | |
2822 | md_update_sb(mddev, 1); | |
2823 | mddev->ro = 1; | |
2824 | } | |
2825 | ||
2826 | /* | |
2827 | * Disable/enable discard support on raid set after any | |
2828 | * conversion, because devices can have been added | |
2829 | */ | |
2830 | configure_discard_support(rs); | |
2831 | ||
2832 | /* Load the bitmap from disk unless raid0 */ | |
e6ca5e1a | 2833 | return __load_dirty_region_bitmap(rs); |
ecbfb9f1 HM |
2834 | } |
2835 | ||
f381e71b JB |
2836 | static void raid_resume(struct dm_target *ti) |
2837 | { | |
2838 | struct raid_set *rs = ti->private; | |
ecbfb9f1 | 2839 | struct mddev *mddev = &rs->md; |
f381e71b | 2840 | |
4286325b | 2841 | if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) { |
ecbfb9f1 HM |
2842 | /* |
2843 | * A secondary resume while the device is active. | |
2844 | * Take this opportunity to check whether any failed | |
2845 | * devices are reachable again. | |
2846 | */ | |
2847 | attempt_restore_of_faulty_devices(rs); | |
47525e59 | 2848 | } |
34f8ac6d | 2849 | |
ecbfb9f1 | 2850 | mddev->ro = 0; |
3a1c1ef2 HM |
2851 | mddev->in_sync = 0; |
2852 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
2853 | ||
ecbfb9f1 HM |
2854 | if (mddev->suspended) |
2855 | mddev_resume(mddev); | |
9d09e663 N |
2856 | } |
2857 | ||
2858 | static struct target_type raid_target = { | |
2859 | .name = "raid", | |
9b6e5423 | 2860 | .version = {1, 9, 0}, |
9d09e663 N |
2861 | .module = THIS_MODULE, |
2862 | .ctr = raid_ctr, | |
2863 | .dtr = raid_dtr, | |
2864 | .map = raid_map, | |
2865 | .status = raid_status, | |
be83651f | 2866 | .message = raid_message, |
9d09e663 N |
2867 | .iterate_devices = raid_iterate_devices, |
2868 | .io_hints = raid_io_hints, | |
2869 | .presuspend = raid_presuspend, | |
2870 | .postsuspend = raid_postsuspend, | |
ecbfb9f1 | 2871 | .preresume = raid_preresume, |
9d09e663 N |
2872 | .resume = raid_resume, |
2873 | }; | |
2874 | ||
2875 | static int __init dm_raid_init(void) | |
2876 | { | |
fe5d2f4a JB |
2877 | DMINFO("Loading target version %u.%u.%u", |
2878 | raid_target.version[0], | |
2879 | raid_target.version[1], | |
2880 | raid_target.version[2]); | |
9d09e663 N |
2881 | return dm_register_target(&raid_target); |
2882 | } | |
2883 | ||
2884 | static void __exit dm_raid_exit(void) | |
2885 | { | |
2886 | dm_unregister_target(&raid_target); | |
2887 | } | |
2888 | ||
2889 | module_init(dm_raid_init); | |
2890 | module_exit(dm_raid_exit); | |
2891 | ||
48cf06bc HM |
2892 | module_param(devices_handle_discard_safely, bool, 0644); |
2893 | MODULE_PARM_DESC(devices_handle_discard_safely, | |
2894 | "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions"); | |
2895 | ||
ef9b85a6 MS |
2896 | MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target"); |
2897 | MODULE_ALIAS("dm-raid0"); | |
63f33b8d JB |
2898 | MODULE_ALIAS("dm-raid1"); |
2899 | MODULE_ALIAS("dm-raid10"); | |
9d09e663 N |
2900 | MODULE_ALIAS("dm-raid4"); |
2901 | MODULE_ALIAS("dm-raid5"); | |
2902 | MODULE_ALIAS("dm-raid6"); | |
2903 | MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>"); | |
3a1c1ef2 | 2904 | MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>"); |
9d09e663 | 2905 | MODULE_LICENSE("GPL"); |