]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blame - drivers/md/dm-raid.c
dm raid: fix rs_set_capacity on growing reshape
[mirror_ubuntu-artful-kernel.git] / drivers / md / dm-raid.c
CommitLineData
9d09e663
N
1/*
2 * Copyright (C) 2010-2011 Neil Brown
702108d1 3 * Copyright (C) 2010-2016 Red Hat, Inc. All rights reserved.
9d09e663
N
4 *
5 * This file is released under the GPL.
6 */
7
8#include <linux/slab.h>
056075c7 9#include <linux/module.h>
9d09e663
N
10
11#include "md.h"
32737279 12#include "raid1.h"
9d09e663 13#include "raid5.h"
63f33b8d 14#include "raid10.h"
9d09e663
N
15#include "bitmap.h"
16
3e8dbb7f
AK
17#include <linux/device-mapper.h>
18
9d09e663 19#define DM_MSG_PREFIX "raid"
92c83d79 20#define MAX_RAID_DEVICES 253 /* md-raid kernel limit */
9d09e663 21
40ba37e5
HM
22/*
23 * Minimum sectors of free reshape space per raid device
24 */
25#define MIN_FREE_RESHAPE_SPACE to_sector(4*4096)
26
48cf06bc
HM
27static bool devices_handle_discard_safely = false;
28
9d09e663 29/*
b12d437b
JB
30 * The following flags are used by dm-raid.c to set up the array state.
31 * They must be cleared before md_run is called.
9d09e663 32 */
43157840 33#define FirstUse 10 /* rdev flag */
9d09e663
N
34
35struct raid_dev {
36 /*
37 * Two DM devices, one to hold metadata and one to hold the
43157840 38 * actual data/parity. The reason for this is to not confuse
9d09e663
N
39 * ti->len and give more flexibility in altering size and
40 * characteristics.
41 *
42 * While it is possible for this device to be associated
43 * with a different physical device than the data_dev, it
44 * is intended for it to be the same.
45 * |--------- Physical Device ---------|
46 * |- meta_dev -|------ data_dev ------|
47 */
48 struct dm_dev *meta_dev;
49 struct dm_dev *data_dev;
3cb03002 50 struct md_rdev rdev;
9d09e663
N
51};
52
53/*
4286325b 54 * Bits for establishing rs->ctr_flags
702108d1
HM
55 *
56 * 1 = no flag value
57 * 2 = flag with value
9d09e663 58 */
4286325b
MS
59#define __CTR_FLAG_SYNC 0 /* 1 */ /* Not with raid0! */
60#define __CTR_FLAG_NOSYNC 1 /* 1 */ /* Not with raid0! */
61#define __CTR_FLAG_REBUILD 2 /* 2 */ /* Not with raid0! */
62#define __CTR_FLAG_DAEMON_SLEEP 3 /* 2 */ /* Not with raid0! */
63#define __CTR_FLAG_MIN_RECOVERY_RATE 4 /* 2 */ /* Not with raid0! */
64#define __CTR_FLAG_MAX_RECOVERY_RATE 5 /* 2 */ /* Not with raid0! */
65#define __CTR_FLAG_MAX_WRITE_BEHIND 6 /* 2 */ /* Only with raid1! */
66#define __CTR_FLAG_WRITE_MOSTLY 7 /* 2 */ /* Only with raid1! */
67#define __CTR_FLAG_STRIPE_CACHE 8 /* 2 */ /* Only with raid4/5/6! */
68#define __CTR_FLAG_REGION_SIZE 9 /* 2 */ /* Not with raid0! */
69#define __CTR_FLAG_RAID10_COPIES 10 /* 2 */ /* Only with raid10 */
70#define __CTR_FLAG_RAID10_FORMAT 11 /* 2 */ /* Only with raid10 */
9b6e5423 71/* New for v1.9.0 */
4286325b
MS
72#define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid4/5/6/10! */
73#define __CTR_FLAG_DATA_OFFSET 13 /* 2 */ /* Only with reshapable raid4/5/6/10! */
74#define __CTR_FLAG_RAID10_USE_NEAR_SETS 14 /* 2 */ /* Only with raid10! */
75
76/*
77 * Flags for rs->ctr_flags field.
78 */
79#define CTR_FLAG_SYNC (1 << __CTR_FLAG_SYNC)
80#define CTR_FLAG_NOSYNC (1 << __CTR_FLAG_NOSYNC)
81#define CTR_FLAG_REBUILD (1 << __CTR_FLAG_REBUILD)
82#define CTR_FLAG_DAEMON_SLEEP (1 << __CTR_FLAG_DAEMON_SLEEP)
83#define CTR_FLAG_MIN_RECOVERY_RATE (1 << __CTR_FLAG_MIN_RECOVERY_RATE)
84#define CTR_FLAG_MAX_RECOVERY_RATE (1 << __CTR_FLAG_MAX_RECOVERY_RATE)
85#define CTR_FLAG_MAX_WRITE_BEHIND (1 << __CTR_FLAG_MAX_WRITE_BEHIND)
86#define CTR_FLAG_WRITE_MOSTLY (1 << __CTR_FLAG_WRITE_MOSTLY)
87#define CTR_FLAG_STRIPE_CACHE (1 << __CTR_FLAG_STRIPE_CACHE)
88#define CTR_FLAG_REGION_SIZE (1 << __CTR_FLAG_REGION_SIZE)
89#define CTR_FLAG_RAID10_COPIES (1 << __CTR_FLAG_RAID10_COPIES)
90#define CTR_FLAG_RAID10_FORMAT (1 << __CTR_FLAG_RAID10_FORMAT)
91#define CTR_FLAG_DELTA_DISKS (1 << __CTR_FLAG_DELTA_DISKS)
92#define CTR_FLAG_DATA_OFFSET (1 << __CTR_FLAG_DATA_OFFSET)
93#define CTR_FLAG_RAID10_USE_NEAR_SETS (1 << __CTR_FLAG_RAID10_USE_NEAR_SETS)
63f33b8d 94
f090279e
HM
95/*
96 * Definitions of various constructor flags to
97 * be used in checks of valid / invalid flags
98 * per raid level.
99 */
100/* Define all any sync flags */
101#define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
102
103/* Define flags for options without argument (e.g. 'nosync') */
33e53f06
HM
104#define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \
105 CTR_FLAG_RAID10_USE_NEAR_SETS)
f090279e
HM
106
107/* Define flags for options with one argument (e.g. 'delta_disks +2') */
108#define CTR_FLAG_OPTIONS_ONE_ARG (CTR_FLAG_REBUILD | \
109 CTR_FLAG_WRITE_MOSTLY | \
110 CTR_FLAG_DAEMON_SLEEP | \
111 CTR_FLAG_MIN_RECOVERY_RATE | \
112 CTR_FLAG_MAX_RECOVERY_RATE | \
113 CTR_FLAG_MAX_WRITE_BEHIND | \
114 CTR_FLAG_STRIPE_CACHE | \
115 CTR_FLAG_REGION_SIZE | \
116 CTR_FLAG_RAID10_COPIES | \
33e53f06
HM
117 CTR_FLAG_RAID10_FORMAT | \
118 CTR_FLAG_DELTA_DISKS | \
119 CTR_FLAG_DATA_OFFSET)
f090279e 120
a30cbc0d
HM
121/* Valid options definitions per raid level... */
122
123/* "raid0" does only accept data offset */
124#define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET)
125
126/* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */
127#define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
128 CTR_FLAG_REBUILD | \
129 CTR_FLAG_WRITE_MOSTLY | \
130 CTR_FLAG_DAEMON_SLEEP | \
131 CTR_FLAG_MIN_RECOVERY_RATE | \
132 CTR_FLAG_MAX_RECOVERY_RATE | \
133 CTR_FLAG_MAX_WRITE_BEHIND | \
134 CTR_FLAG_REGION_SIZE | \
135 CTR_FLAG_DATA_OFFSET)
f090279e 136
a30cbc0d
HM
137/* "raid10" does not accept any raid1 or stripe cache options */
138#define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
139 CTR_FLAG_REBUILD | \
140 CTR_FLAG_DAEMON_SLEEP | \
141 CTR_FLAG_MIN_RECOVERY_RATE | \
142 CTR_FLAG_MAX_RECOVERY_RATE | \
143 CTR_FLAG_REGION_SIZE | \
f090279e 144 CTR_FLAG_RAID10_COPIES | \
33e53f06
HM
145 CTR_FLAG_RAID10_FORMAT | \
146 CTR_FLAG_DELTA_DISKS | \
a30cbc0d
HM
147 CTR_FLAG_DATA_OFFSET | \
148 CTR_FLAG_RAID10_USE_NEAR_SETS)
f090279e 149
f090279e
HM
150/*
151 * "raid4/5/6" do not accept any raid1 or raid10 specific options
152 *
153 * "raid6" does not accept "nosync", because it is not guaranteed
154 * that both parity and q-syndrome are being written properly with
155 * any writes
156 */
a30cbc0d
HM
157#define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
158 CTR_FLAG_REBUILD | \
159 CTR_FLAG_DAEMON_SLEEP | \
160 CTR_FLAG_MIN_RECOVERY_RATE | \
161 CTR_FLAG_MAX_RECOVERY_RATE | \
f090279e 162 CTR_FLAG_MAX_WRITE_BEHIND | \
a30cbc0d
HM
163 CTR_FLAG_STRIPE_CACHE | \
164 CTR_FLAG_REGION_SIZE | \
165 CTR_FLAG_DELTA_DISKS | \
166 CTR_FLAG_DATA_OFFSET)
167
168#define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \
169 CTR_FLAG_REBUILD | \
170 CTR_FLAG_DAEMON_SLEEP | \
171 CTR_FLAG_MIN_RECOVERY_RATE | \
172 CTR_FLAG_MAX_RECOVERY_RATE | \
173 CTR_FLAG_MAX_WRITE_BEHIND | \
174 CTR_FLAG_STRIPE_CACHE | \
175 CTR_FLAG_REGION_SIZE | \
176 CTR_FLAG_DELTA_DISKS | \
177 CTR_FLAG_DATA_OFFSET)
178/* ...valid options definitions per raid level */
f090279e 179
ecbfb9f1
HM
180/*
181 * Flags for rs->runtime_flags field
182 * (RT_FLAG prefix meaning "runtime flag")
183 *
184 * These are all internal and used to define runtime state,
185 * e.g. to prevent another resume from preresume processing
186 * the raid set all over again.
187 */
40ba37e5
HM
188#define RT_FLAG_RS_PRERESUMED 0
189#define RT_FLAG_RS_RESUMED 1
190#define RT_FLAG_RS_BITMAP_LOADED 2
191#define RT_FLAG_UPDATE_SBS 3
9dbd1aa3 192#define RT_FLAG_RESHAPE_RS 4
6e20902e 193#define RT_FLAG_KEEP_RS_FROZEN 5
ecbfb9f1 194
33e53f06
HM
195/* Array elements of 64 bit needed for rebuild/write_mostly bits */
196#define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
197
ecbfb9f1
HM
198/*
199 * raid set level, layout and chunk sectors backup/restore
200 */
201struct rs_layout {
202 int new_level;
203 int new_layout;
204 int new_chunk_sectors;
205};
206
9d09e663
N
207struct raid_set {
208 struct dm_target *ti;
209
34f8ac6d 210 uint32_t bitmap_loaded;
9dbd1aa3 211 uint32_t stripe_cache_entries;
4286325b
MS
212 unsigned long ctr_flags;
213 unsigned long runtime_flags;
ecbfb9f1
HM
214
215 uint64_t rebuild_disks[DISKS_ARRAY_ELEMS];
9d09e663 216
33e53f06
HM
217 int raid_disks;
218 int delta_disks;
4763e543 219 int data_offset;
33e53f06 220 int raid10_copies;
4257e085 221 int requested_bitmap_chunk_sectors;
33e53f06 222
fd01b88c 223 struct mddev md;
9d09e663
N
224 struct raid_type *raid_type;
225 struct dm_target_callbacks callbacks;
226
227 struct raid_dev dev[0];
228};
229
9dbd1aa3 230static void rs_config_backup(struct raid_set *rs, struct rs_layout *l)
ecbfb9f1
HM
231{
232 struct mddev *mddev = &rs->md;
233
234 l->new_level = mddev->new_level;
235 l->new_layout = mddev->new_layout;
236 l->new_chunk_sectors = mddev->new_chunk_sectors;
237}
238
9dbd1aa3 239static void rs_config_restore(struct raid_set *rs, struct rs_layout *l)
ecbfb9f1
HM
240{
241 struct mddev *mddev = &rs->md;
242
243 mddev->new_level = l->new_level;
244 mddev->new_layout = l->new_layout;
245 mddev->new_chunk_sectors = l->new_chunk_sectors;
246}
247
33e53f06
HM
248/* raid10 algorithms (i.e. formats) */
249#define ALGORITHM_RAID10_DEFAULT 0
250#define ALGORITHM_RAID10_NEAR 1
251#define ALGORITHM_RAID10_OFFSET 2
252#define ALGORITHM_RAID10_FAR 3
253
9d09e663
N
254/* Supported raid types and properties. */
255static struct raid_type {
256 const char *name; /* RAID algorithm. */
257 const char *descr; /* Descriptor text for logging. */
258 const unsigned parity_devs; /* # of parity devices. */
259 const unsigned minimal_devs; /* minimal # of devices in set. */
260 const unsigned level; /* RAID level. */
261 const unsigned algorithm; /* RAID algorithm. */
262} raid_types[] = {
43157840
MS
263 {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */},
264 {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */},
265 {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR},
33e53f06 266 {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET},
43157840
MS
267 {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR},
268 {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT},
269 {"raid4", "raid4 (dedicated last parity disk)", 1, 2, 4, ALGORITHM_PARITY_N}, /* raid4 layout = raid5_n */
270 {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N},
271 {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC},
272 {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC},
273 {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC},
274 {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC},
275 {"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART},
276 {"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART},
277 {"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE},
278 {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6},
279 {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6},
280 {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6},
281 {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6},
282 {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6}
9d09e663
N
283};
284
92c83d79 285/* True, if @v is in inclusive range [@min, @max] */
bb91a63f 286static bool __within_range(long v, long min, long max)
92c83d79
HM
287{
288 return v >= min && v <= max;
289}
290
702108d1
HM
291/* All table line arguments are defined here */
292static struct arg_name_flag {
4286325b 293 const unsigned long flag;
702108d1 294 const char *name;
e6ca5e1a 295} __arg_name_flags[] = {
702108d1
HM
296 { CTR_FLAG_SYNC, "sync"},
297 { CTR_FLAG_NOSYNC, "nosync"},
298 { CTR_FLAG_REBUILD, "rebuild"},
299 { CTR_FLAG_DAEMON_SLEEP, "daemon_sleep"},
300 { CTR_FLAG_MIN_RECOVERY_RATE, "min_recovery_rate"},
301 { CTR_FLAG_MAX_RECOVERY_RATE, "max_recovery_rate"},
302 { CTR_FLAG_MAX_WRITE_BEHIND, "max_write_behind"},
303 { CTR_FLAG_WRITE_MOSTLY, "writemostly"},
304 { CTR_FLAG_STRIPE_CACHE, "stripe_cache"},
305 { CTR_FLAG_REGION_SIZE, "region_size"},
306 { CTR_FLAG_RAID10_COPIES, "raid10_copies"},
307 { CTR_FLAG_RAID10_FORMAT, "raid10_format"},
4763e543
HM
308 { CTR_FLAG_DATA_OFFSET, "data_offset"},
309 { CTR_FLAG_DELTA_DISKS, "delta_disks"},
310 { CTR_FLAG_RAID10_USE_NEAR_SETS, "raid10_use_near_sets"},
702108d1
HM
311};
312
313/* Return argument name string for given @flag */
3fa6cf38 314static const char *dm_raid_arg_name_by_flag(const uint32_t flag)
702108d1
HM
315{
316 if (hweight32(flag) == 1) {
e6ca5e1a 317 struct arg_name_flag *anf = __arg_name_flags + ARRAY_SIZE(__arg_name_flags);
702108d1 318
e6ca5e1a 319 while (anf-- > __arg_name_flags)
4286325b 320 if (flag & anf->flag)
702108d1
HM
321 return anf->name;
322
323 } else
324 DMERR("%s called with more than one flag!", __func__);
325
326 return NULL;
327}
328
33e53f06
HM
329/*
330 * bool helpers to test for various raid levels of a raid set,
331 * is. it's level as reported by the superblock rather than
332 * the requested raid_type passed to the constructor.
333 */
334/* Return true, if raid set in @rs is raid0 */
335static bool rs_is_raid0(struct raid_set *rs)
336{
337 return !rs->md.level;
338}
339
9dbd1aa3
HM
340/* Return true, if raid set in @rs is raid1 */
341static bool rs_is_raid1(struct raid_set *rs)
342{
343 return rs->md.level == 1;
344}
345
33e53f06
HM
346/* Return true, if raid set in @rs is raid10 */
347static bool rs_is_raid10(struct raid_set *rs)
348{
349 return rs->md.level == 10;
350}
351
40ba37e5
HM
352/* Return true, if raid set in @rs is level 4, 5 or 6 */
353static bool rs_is_raid456(struct raid_set *rs)
354{
355 return __within_range(rs->md.level, 4, 6);
356}
357
358/* Return true, if raid set in @rs is reshapable */
359static unsigned int __is_raid10_far(int layout);
360static bool rs_is_reshapable(struct raid_set *rs)
361{
362 return rs_is_raid456(rs) ||
363 (rs_is_raid10(rs) && !__is_raid10_far(rs->md.new_layout));
364}
365
9dbd1aa3
HM
366/* Return true, if raid set in @rs is recovering */
367static bool rs_is_recovering(struct raid_set *rs)
368{
9dbd1aa3
HM
369 return rs->md.recovery_cp != MaxSector;
370}
371
372/* Return true, if raid set in @rs is reshaping */
373static bool rs_is_reshaping(struct raid_set *rs)
374{
9dbd1aa3
HM
375 return rs->md.reshape_position != MaxSector;
376}
377
f090279e
HM
378/*
379 * bool helpers to test for various raid levels of a raid type
380 */
381
382/* Return true, if raid type in @rt is raid0 */
383static bool rt_is_raid0(struct raid_type *rt)
384{
385 return !rt->level;
386}
387
388/* Return true, if raid type in @rt is raid1 */
389static bool rt_is_raid1(struct raid_type *rt)
390{
391 return rt->level == 1;
392}
393
394/* Return true, if raid type in @rt is raid10 */
395static bool rt_is_raid10(struct raid_type *rt)
396{
397 return rt->level == 10;
398}
399
400/* Return true, if raid type in @rt is raid4/5 */
401static bool rt_is_raid45(struct raid_type *rt)
402{
bb91a63f 403 return __within_range(rt->level, 4, 5);
f090279e
HM
404}
405
406/* Return true, if raid type in @rt is raid6 */
407static bool rt_is_raid6(struct raid_type *rt)
408{
409 return rt->level == 6;
410}
676fa5ad
HM
411
412/* Return true, if raid type in @rt is raid4/5/6 */
413static bool rt_is_raid456(struct raid_type *rt)
414{
bb91a63f 415 return __within_range(rt->level, 4, 6);
676fa5ad 416}
f090279e
HM
417/* END: raid level bools */
418
a30cbc0d
HM
419/* Return valid ctr flags for the raid level of @rs */
420static unsigned long __valid_flags(struct raid_set *rs)
f090279e
HM
421{
422 if (rt_is_raid0(rs->raid_type))
a30cbc0d 423 return RAID0_VALID_FLAGS;
f090279e 424 else if (rt_is_raid1(rs->raid_type))
a30cbc0d 425 return RAID1_VALID_FLAGS;
f090279e 426 else if (rt_is_raid10(rs->raid_type))
a30cbc0d 427 return RAID10_VALID_FLAGS;
f090279e 428 else if (rt_is_raid45(rs->raid_type))
a30cbc0d 429 return RAID45_VALID_FLAGS;
f090279e 430 else if (rt_is_raid6(rs->raid_type))
a30cbc0d 431 return RAID6_VALID_FLAGS;
f090279e
HM
432
433 return ~0;
434}
435
436/*
a30cbc0d 437 * Check for valid flags set on @rs
f090279e
HM
438 *
439 * Has to be called after parsing of the ctr flags!
440 */
a30cbc0d 441static int rs_check_for_valid_flags(struct raid_set *rs)
f090279e 442{
a30cbc0d 443 if (rs->ctr_flags & ~__valid_flags(rs)) {
4286325b 444 rs->ti->error = "Invalid flags combination";
bd83a4c4
MS
445 return -EINVAL;
446 }
f090279e
HM
447
448 return 0;
449}
450
33e53f06
HM
451/* MD raid10 bit definitions and helpers */
452#define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */
453#define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
454#define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */
455#define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */
456
457/* Return md raid10 near copies for @layout */
e6ca5e1a 458static unsigned int __raid10_near_copies(int layout)
33e53f06
HM
459{
460 return layout & 0xFF;
461}
462
463/* Return md raid10 far copies for @layout */
e6ca5e1a 464static unsigned int __raid10_far_copies(int layout)
33e53f06 465{
e6ca5e1a 466 return __raid10_near_copies(layout >> RAID10_FAR_COPIES_SHIFT);
33e53f06
HM
467}
468
469/* Return true if md raid10 offset for @layout */
e6ca5e1a 470static unsigned int __is_raid10_offset(int layout)
33e53f06
HM
471{
472 return layout & RAID10_OFFSET;
473}
474
475/* Return true if md raid10 near for @layout */
e6ca5e1a 476static unsigned int __is_raid10_near(int layout)
33e53f06 477{
e6ca5e1a 478 return !__is_raid10_offset(layout) && __raid10_near_copies(layout) > 1;
33e53f06
HM
479}
480
481/* Return true if md raid10 far for @layout */
e6ca5e1a 482static unsigned int __is_raid10_far(int layout)
33e53f06 483{
e6ca5e1a 484 return !__is_raid10_offset(layout) && __raid10_far_copies(layout) > 1;
33e53f06
HM
485}
486
487/* Return md raid10 layout string for @layout */
488static const char *raid10_md_layout_to_format(int layout)
fe5d2f4a
JB
489{
490 /*
33e53f06
HM
491 * Bit 16 stands for "offset"
492 * (i.e. adjacent stripes hold copies)
493 *
fe5d2f4a
JB
494 * Refer to MD's raid10.c for details
495 */
e6ca5e1a 496 if (__is_raid10_offset(layout))
fe5d2f4a
JB
497 return "offset";
498
e6ca5e1a 499 if (__raid10_near_copies(layout) > 1)
fe5d2f4a
JB
500 return "near";
501
e6ca5e1a 502 WARN_ON(__raid10_far_copies(layout) < 2);
33e53f06 503
fe5d2f4a
JB
504 return "far";
505}
506
33e53f06 507/* Return md raid10 algorithm for @name */
68c1c4d5 508static int raid10_name_to_format(const char *name)
33e53f06
HM
509{
510 if (!strcasecmp(name, "near"))
511 return ALGORITHM_RAID10_NEAR;
512 else if (!strcasecmp(name, "offset"))
513 return ALGORITHM_RAID10_OFFSET;
514 else if (!strcasecmp(name, "far"))
515 return ALGORITHM_RAID10_FAR;
516
517 return -EINVAL;
518}
519
33e53f06
HM
520/* Return md raid10 copies for @layout */
521static unsigned int raid10_md_layout_to_copies(int layout)
63f33b8d 522{
e6ca5e1a
MS
523 return __raid10_near_copies(layout) > 1 ?
524 __raid10_near_copies(layout) : __raid10_far_copies(layout);
63f33b8d
JB
525}
526
33e53f06
HM
527/* Return md raid10 format id for @format string */
528static int raid10_format_to_md_layout(struct raid_set *rs,
529 unsigned int algorithm,
530 unsigned int copies)
63f33b8d 531{
33e53f06 532 unsigned int n = 1, f = 1, r = 0;
fe5d2f4a 533
33e53f06
HM
534 /*
535 * MD resilienece flaw:
536 *
537 * enabling use_far_sets for far/offset formats causes copies
538 * to be colocated on the same devs together with their origins!
539 *
540 * -> disable it for now in the definition above
541 */
542 if (algorithm == ALGORITHM_RAID10_DEFAULT ||
543 algorithm == ALGORITHM_RAID10_NEAR)
fe5d2f4a 544 n = copies;
33e53f06
HM
545
546 else if (algorithm == ALGORITHM_RAID10_OFFSET) {
547 f = copies;
548 r = RAID10_OFFSET;
4286325b 549 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
33e53f06
HM
550 r |= RAID10_USE_FAR_SETS;
551
552 } else if (algorithm == ALGORITHM_RAID10_FAR) {
fe5d2f4a 553 f = copies;
33e53f06 554 r = !RAID10_OFFSET;
4286325b 555 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags))
33e53f06 556 r |= RAID10_USE_FAR_SETS;
fe5d2f4a 557
33e53f06
HM
558 } else
559 return -EINVAL;
560
561 return r | (f << RAID10_FAR_COPIES_SHIFT) | n;
562}
563/* END: MD raid10 bit definitions and helpers */
fe5d2f4a 564
33e53f06 565/* Check for any of the raid10 algorithms */
e6ca5e1a 566static int __got_raid10(struct raid_type *rtp, const int layout)
33e53f06
HM
567{
568 if (rtp->level == 10) {
569 switch (rtp->algorithm) {
570 case ALGORITHM_RAID10_DEFAULT:
571 case ALGORITHM_RAID10_NEAR:
e6ca5e1a 572 return __is_raid10_near(layout);
33e53f06 573 case ALGORITHM_RAID10_OFFSET:
e6ca5e1a 574 return __is_raid10_offset(layout);
33e53f06 575 case ALGORITHM_RAID10_FAR:
e6ca5e1a 576 return __is_raid10_far(layout);
33e53f06
HM
577 default:
578 break;
579 }
580 }
fe5d2f4a 581
33e53f06 582 return 0;
63f33b8d
JB
583}
584
33e53f06 585/* Return raid_type for @name */
92c83d79 586static struct raid_type *get_raid_type(const char *name)
9d09e663 587{
33e53f06 588 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
9d09e663 589
33e53f06
HM
590 while (rtp-- > raid_types)
591 if (!strcasecmp(rtp->name, name))
592 return rtp;
9d09e663
N
593
594 return NULL;
595}
596
33e53f06
HM
597/* Return raid_type for @name based derived from @level and @layout */
598static struct raid_type *get_raid_type_by_ll(const int level, const int layout)
599{
600 struct raid_type *rtp = raid_types + ARRAY_SIZE(raid_types);
601
602 while (rtp-- > raid_types) {
603 /* RAID10 special checks based on @layout flags/properties */
604 if (rtp->level == level &&
e6ca5e1a 605 (__got_raid10(rtp, layout) || rtp->algorithm == layout))
33e53f06
HM
606 return rtp;
607 }
608
609 return NULL;
610}
611
9dbd1aa3
HM
612/*
613 * Conditionally change bdev capacity of @rs
614 * in case of a disk add/remove reshape
615 */
616static void rs_set_capacity(struct raid_set *rs)
617{
618 struct mddev *mddev = &rs->md;
0095dbc9 619 struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
9dbd1aa3 620
0095dbc9
HM
621 set_capacity(gendisk, mddev->array_sectors);
622 revalidate_disk(gendisk);
9dbd1aa3
HM
623}
624
3a1c1ef2
HM
625/*
626 * Set the mddev properties in @rs to the current
627 * ones retrieved from the freshest superblock
628 */
629static void rs_set_cur(struct raid_set *rs)
630{
631 struct mddev *mddev = &rs->md;
632
633 mddev->new_level = mddev->level;
634 mddev->new_layout = mddev->layout;
635 mddev->new_chunk_sectors = mddev->chunk_sectors;
636}
637
33e53f06
HM
638/*
639 * Set the mddev properties in @rs to the new
640 * ones requested by the ctr
641 */
642static void rs_set_new(struct raid_set *rs)
643{
644 struct mddev *mddev = &rs->md;
645
646 mddev->level = mddev->new_level;
647 mddev->layout = mddev->new_layout;
648 mddev->chunk_sectors = mddev->new_chunk_sectors;
3a1c1ef2 649 mddev->raid_disks = rs->raid_disks;
33e53f06
HM
650 mddev->delta_disks = 0;
651}
652
bfcee0e3
MS
653static struct raid_set *raid_set_alloc(struct dm_target *ti, struct raid_type *raid_type,
654 unsigned raid_devs)
9d09e663
N
655{
656 unsigned i;
657 struct raid_set *rs;
9d09e663 658
bd83a4c4
MS
659 if (raid_devs <= raid_type->parity_devs) {
660 ti->error = "Insufficient number of devices";
661 return ERR_PTR(-EINVAL);
662 }
9d09e663 663
9d09e663 664 rs = kzalloc(sizeof(*rs) + raid_devs * sizeof(rs->dev[0]), GFP_KERNEL);
bd83a4c4
MS
665 if (!rs) {
666 ti->error = "Cannot allocate raid context";
667 return ERR_PTR(-ENOMEM);
668 }
9d09e663
N
669
670 mddev_init(&rs->md);
671
33e53f06
HM
672 rs->raid_disks = raid_devs;
673 rs->delta_disks = 0;
674
9d09e663
N
675 rs->ti = ti;
676 rs->raid_type = raid_type;
9dbd1aa3 677 rs->stripe_cache_entries = 256;
9d09e663
N
678 rs->md.raid_disks = raid_devs;
679 rs->md.level = raid_type->level;
680 rs->md.new_level = rs->md.level;
9d09e663
N
681 rs->md.layout = raid_type->algorithm;
682 rs->md.new_layout = rs->md.layout;
683 rs->md.delta_disks = 0;
ecbfb9f1 684 rs->md.recovery_cp = rs_is_raid0(rs) ? MaxSector : 0;
9d09e663
N
685
686 for (i = 0; i < raid_devs; i++)
687 md_rdev_init(&rs->dev[i].rdev);
688
689 /*
690 * Remaining items to be initialized by further RAID params:
691 * rs->md.persistent
692 * rs->md.external
693 * rs->md.chunk_sectors
694 * rs->md.new_chunk_sectors
c039c332 695 * rs->md.dev_sectors
9d09e663
N
696 */
697
698 return rs;
699}
700
bfcee0e3 701static void raid_set_free(struct raid_set *rs)
9d09e663
N
702{
703 int i;
704
b12d437b
JB
705 for (i = 0; i < rs->md.raid_disks; i++) {
706 if (rs->dev[i].meta_dev)
707 dm_put_device(rs->ti, rs->dev[i].meta_dev);
545c8795 708 md_rdev_clear(&rs->dev[i].rdev);
9d09e663
N
709 if (rs->dev[i].data_dev)
710 dm_put_device(rs->ti, rs->dev[i].data_dev);
b12d437b 711 }
9d09e663
N
712
713 kfree(rs);
714}
715
716/*
717 * For every device we have two words
718 * <meta_dev>: meta device name or '-' if missing
719 * <data_dev>: data device name or '-' if missing
720 *
b12d437b
JB
721 * The following are permitted:
722 * - -
723 * - <data_dev>
724 * <meta_dev> <data_dev>
725 *
726 * The following is not allowed:
727 * <meta_dev> -
728 *
729 * This code parses those words. If there is a failure,
bfcee0e3 730 * the caller must use raid_set_free() to unwind the operations.
9d09e663 731 */
702108d1 732static int parse_dev_params(struct raid_set *rs, struct dm_arg_set *as)
9d09e663
N
733{
734 int i;
735 int rebuild = 0;
736 int metadata_available = 0;
73c6f239 737 int r = 0;
92c83d79 738 const char *arg;
9d09e663 739
92c83d79
HM
740 /* Put off the number of raid devices argument to get to dev pairs */
741 arg = dm_shift_arg(as);
742 if (!arg)
743 return -EINVAL;
744
745 for (i = 0; i < rs->md.raid_disks; i++) {
9d09e663
N
746 rs->dev[i].rdev.raid_disk = i;
747
748 rs->dev[i].meta_dev = NULL;
749 rs->dev[i].data_dev = NULL;
750
751 /*
752 * There are no offsets, since there is a separate device
753 * for data and metadata.
754 */
755 rs->dev[i].rdev.data_offset = 0;
756 rs->dev[i].rdev.mddev = &rs->md;
757
92c83d79
HM
758 arg = dm_shift_arg(as);
759 if (!arg)
760 return -EINVAL;
761
762 if (strcmp(arg, "-")) {
bd83a4c4
MS
763 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
764 &rs->dev[i].meta_dev);
765 if (r) {
766 rs->ti->error = "RAID metadata device lookup failure";
767 return r;
768 }
b12d437b
JB
769
770 rs->dev[i].rdev.sb_page = alloc_page(GFP_KERNEL);
bd83a4c4
MS
771 if (!rs->dev[i].rdev.sb_page) {
772 rs->ti->error = "Failed to allocate superblock page";
773 return -ENOMEM;
774 }
9d09e663
N
775 }
776
92c83d79
HM
777 arg = dm_shift_arg(as);
778 if (!arg)
779 return -EINVAL;
780
781 if (!strcmp(arg, "-")) {
9d09e663 782 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) &&
bd83a4c4
MS
783 (!rs->dev[i].rdev.recovery_offset)) {
784 rs->ti->error = "Drive designated for rebuild not specified";
785 return -EINVAL;
786 }
9d09e663 787
bd83a4c4
MS
788 if (rs->dev[i].meta_dev) {
789 rs->ti->error = "No data device supplied with metadata device";
790 return -EINVAL;
791 }
b12d437b 792
9d09e663
N
793 continue;
794 }
795
bd83a4c4
MS
796 r = dm_get_device(rs->ti, arg, dm_table_get_mode(rs->ti->table),
797 &rs->dev[i].data_dev);
798 if (r) {
799 rs->ti->error = "RAID device lookup failure";
800 return r;
801 }
9d09e663 802
b12d437b
JB
803 if (rs->dev[i].meta_dev) {
804 metadata_available = 1;
805 rs->dev[i].rdev.meta_bdev = rs->dev[i].meta_dev->bdev;
806 }
9d09e663 807 rs->dev[i].rdev.bdev = rs->dev[i].data_dev->bdev;
3a1c1ef2 808 list_add_tail(&rs->dev[i].rdev.same_set, &rs->md.disks);
9d09e663
N
809 if (!test_bit(In_sync, &rs->dev[i].rdev.flags))
810 rebuild++;
811 }
812
813 if (metadata_available) {
814 rs->md.external = 0;
815 rs->md.persistent = 1;
816 rs->md.major_version = 2;
817 } else if (rebuild && !rs->md.recovery_cp) {
818 /*
819 * Without metadata, we will not be able to tell if the array
820 * is in-sync or not - we must assume it is not. Therefore,
821 * it is impossible to rebuild a drive.
822 *
823 * Even if there is metadata, the on-disk information may
824 * indicate that the array is not in-sync and it will then
825 * fail at that time.
826 *
827 * User could specify 'nosync' option if desperate.
828 */
bd83a4c4
MS
829 rs->ti->error = "Unable to rebuild drive while array is not in-sync";
830 return -EINVAL;
9d09e663
N
831 }
832
833 return 0;
834}
835
c1084561
JB
836/*
837 * validate_region_size
838 * @rs
839 * @region_size: region size in sectors. If 0, pick a size (4MiB default).
840 *
841 * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
842 * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
843 *
844 * Returns: 0 on success, -EINVAL on failure.
845 */
846static int validate_region_size(struct raid_set *rs, unsigned long region_size)
847{
848 unsigned long min_region_size = rs->ti->len / (1 << 21);
849
850 if (!region_size) {
851 /*
43157840 852 * Choose a reasonable default. All figures in sectors.
c1084561
JB
853 */
854 if (min_region_size > (1 << 13)) {
3a0f9aae 855 /* If not a power of 2, make it the next power of 2 */
042745ee 856 region_size = roundup_pow_of_two(min_region_size);
c1084561
JB
857 DMINFO("Choosing default region size of %lu sectors",
858 region_size);
c1084561
JB
859 } else {
860 DMINFO("Choosing default region size of 4MiB");
861 region_size = 1 << 13; /* sectors */
862 }
863 } else {
864 /*
865 * Validate user-supplied value.
866 */
bd83a4c4
MS
867 if (region_size > rs->ti->len) {
868 rs->ti->error = "Supplied region size is too large";
869 return -EINVAL;
870 }
c1084561
JB
871
872 if (region_size < min_region_size) {
873 DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
874 region_size, min_region_size);
bd83a4c4
MS
875 rs->ti->error = "Supplied region size is too small";
876 return -EINVAL;
c1084561
JB
877 }
878
bd83a4c4
MS
879 if (!is_power_of_2(region_size)) {
880 rs->ti->error = "Region size is not a power of 2";
881 return -EINVAL;
882 }
c1084561 883
bd83a4c4
MS
884 if (region_size < rs->md.chunk_sectors) {
885 rs->ti->error = "Region size is smaller than the chunk size";
886 return -EINVAL;
887 }
c1084561
JB
888 }
889
890 /*
891 * Convert sectors to bytes.
892 */
893 rs->md.bitmap_info.chunksize = (region_size << 9);
894
895 return 0;
896}
897
eb649123 898/*
55ebbb59 899 * validate_raid_redundancy
eb649123
JB
900 * @rs
901 *
55ebbb59
JB
902 * Determine if there are enough devices in the array that haven't
903 * failed (or are being rebuilt) to form a usable array.
eb649123
JB
904 *
905 * Returns: 0 on success, -EINVAL on failure.
906 */
55ebbb59 907static int validate_raid_redundancy(struct raid_set *rs)
eb649123
JB
908{
909 unsigned i, rebuild_cnt = 0;
9dbd1aa3 910 unsigned rebuilds_per_group = 0, copies;
fe5d2f4a 911 unsigned group_size, last_group_start;
eb649123 912
eb649123 913 for (i = 0; i < rs->md.raid_disks; i++)
55ebbb59
JB
914 if (!test_bit(In_sync, &rs->dev[i].rdev.flags) ||
915 !rs->dev[i].rdev.sb_page)
eb649123
JB
916 rebuild_cnt++;
917
918 switch (rs->raid_type->level) {
919 case 1:
920 if (rebuild_cnt >= rs->md.raid_disks)
921 goto too_many;
922 break;
923 case 4:
924 case 5:
925 case 6:
926 if (rebuild_cnt > rs->raid_type->parity_devs)
927 goto too_many;
928 break;
929 case 10:
9dbd1aa3 930 copies = raid10_md_layout_to_copies(rs->md.new_layout);
4ec1e369
JB
931 if (rebuild_cnt < copies)
932 break;
933
934 /*
935 * It is possible to have a higher rebuild count for RAID10,
936 * as long as the failed devices occur in different mirror
937 * groups (i.e. different stripes).
938 *
4ec1e369
JB
939 * When checking "near" format, make sure no adjacent devices
940 * have failed beyond what can be handled. In addition to the
941 * simple case where the number of devices is a multiple of the
942 * number of copies, we must also handle cases where the number
943 * of devices is not a multiple of the number of copies.
43157840
MS
944 * E.g. dev1 dev2 dev3 dev4 dev5
945 * A A B B C
946 * C D D E E
4ec1e369 947 */
9dbd1aa3
HM
948 if (__is_raid10_near(rs->md.new_layout)) {
949 for (i = 0; i < rs->raid_disks; i++) {
fe5d2f4a
JB
950 if (!(i % copies))
951 rebuilds_per_group = 0;
9dbd1aa3 952 if ((!rs->dev[i].rdev.sb_page ||
40ba37e5 953 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
fe5d2f4a
JB
954 (++rebuilds_per_group >= copies))
955 goto too_many;
956 }
957 break;
958 }
959
960 /*
961 * When checking "far" and "offset" formats, we need to ensure
962 * that the device that holds its copy is not also dead or
963 * being rebuilt. (Note that "far" and "offset" formats only
964 * support two copies right now. These formats also only ever
965 * use the 'use_far_sets' variant.)
966 *
967 * This check is somewhat complicated by the need to account
43157840 968 * for arrays that are not a multiple of (far) copies. This
fe5d2f4a
JB
969 * results in the need to treat the last (potentially larger)
970 * set differently.
971 */
972 group_size = (rs->md.raid_disks / copies);
973 last_group_start = (rs->md.raid_disks / group_size) - 1;
974 last_group_start *= group_size;
975 for (i = 0; i < rs->md.raid_disks; i++) {
976 if (!(i % copies) && !(i > last_group_start))
55ebbb59 977 rebuilds_per_group = 0;
fe5d2f4a
JB
978 if ((!rs->dev[i].rdev.sb_page ||
979 !test_bit(In_sync, &rs->dev[i].rdev.flags)) &&
4ec1e369 980 (++rebuilds_per_group >= copies))
fe5d2f4a 981 goto too_many;
4ec1e369
JB
982 }
983 break;
eb649123 984 default:
55ebbb59
JB
985 if (rebuild_cnt)
986 return -EINVAL;
eb649123
JB
987 }
988
989 return 0;
990
991too_many:
eb649123
JB
992 return -EINVAL;
993}
994
9d09e663
N
995/*
996 * Possible arguments are...
9d09e663
N
997 * <chunk_size> [optional_args]
998 *
32737279
JB
999 * Argument definitions
1000 * <chunk_size> The number of sectors per disk that
43157840 1001 * will form the "stripe"
32737279 1002 * [[no]sync] Force or prevent recovery of the
43157840 1003 * entire array
9d09e663 1004 * [rebuild <idx>] Rebuild the drive indicated by the index
32737279 1005 * [daemon_sleep <ms>] Time between bitmap daemon work to
43157840 1006 * clear bits
9d09e663
N
1007 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1008 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
46bed2b5 1009 * [write_mostly <idx>] Indicate a write mostly drive via index
9d09e663
N
1010 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
1011 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
43157840 1012 * [region_size <sectors>] Defines granularity of bitmap
63f33b8d
JB
1013 *
1014 * RAID10-only options:
43157840 1015 * [raid10_copies <# copies>] Number of copies. (Default: 2)
fe5d2f4a 1016 * [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
9d09e663 1017 */
92c83d79 1018static int parse_raid_params(struct raid_set *rs, struct dm_arg_set *as,
9d09e663
N
1019 unsigned num_raid_params)
1020{
9dbd1aa3 1021 int value, raid10_format = ALGORITHM_RAID10_DEFAULT;
63f33b8d 1022 unsigned raid10_copies = 2;
5fa146b2 1023 unsigned i, write_mostly = 0;
9dbd1aa3 1024 unsigned region_size = 0;
542f9038 1025 sector_t max_io_len;
92c83d79 1026 const char *arg, *key;
702108d1 1027 struct raid_dev *rd;
33e53f06 1028 struct raid_type *rt = rs->raid_type;
92c83d79
HM
1029
1030 arg = dm_shift_arg(as);
1031 num_raid_params--; /* Account for chunk_size argument */
1032
9dbd1aa3 1033 if (kstrtoint(arg, 10, &value) < 0) {
bd83a4c4
MS
1034 rs->ti->error = "Bad numerical argument given for chunk_size";
1035 return -EINVAL;
1036 }
9d09e663
N
1037
1038 /*
1039 * First, parse the in-order required arguments
32737279 1040 * "chunk_size" is the only argument of this type.
9d09e663 1041 */
33e53f06 1042 if (rt_is_raid1(rt)) {
32737279
JB
1043 if (value)
1044 DMERR("Ignoring chunk size parameter for RAID 1");
1045 value = 0;
bd83a4c4
MS
1046 } else if (!is_power_of_2(value)) {
1047 rs->ti->error = "Chunk size must be a power of 2";
1048 return -EINVAL;
1049 } else if (value < 8) {
1050 rs->ti->error = "Chunk size value is too small";
1051 return -EINVAL;
1052 }
9d09e663
N
1053
1054 rs->md.new_chunk_sectors = rs->md.chunk_sectors = value;
9d09e663
N
1055
1056 /*
b12d437b
JB
1057 * We set each individual device as In_sync with a completed
1058 * 'recovery_offset'. If there has been a device failure or
1059 * replacement then one of the following cases applies:
1060 *
1061 * 1) User specifies 'rebuild'.
43157840 1062 * - Device is reset when param is read.
b12d437b 1063 * 2) A new device is supplied.
43157840 1064 * - No matching superblock found, resets device.
b12d437b 1065 * 3) Device failure was transient and returns on reload.
43157840 1066 * - Failure noticed, resets device for bitmap replay.
b12d437b 1067 * 4) Device hadn't completed recovery after previous failure.
43157840 1068 * - Superblock is read and overrides recovery_offset.
b12d437b
JB
1069 *
1070 * What is found in the superblocks of the devices is always
1071 * authoritative, unless 'rebuild' or '[no]sync' was specified.
9d09e663 1072 */
b12d437b 1073 for (i = 0; i < rs->md.raid_disks; i++) {
9d09e663 1074 set_bit(In_sync, &rs->dev[i].rdev.flags);
b12d437b
JB
1075 rs->dev[i].rdev.recovery_offset = MaxSector;
1076 }
9d09e663 1077
b12d437b
JB
1078 /*
1079 * Second, parse the unordered optional arguments
1080 */
9d09e663 1081 for (i = 0; i < num_raid_params; i++) {
4763e543 1082 key = dm_shift_arg(as);
bd83a4c4
MS
1083 if (!key) {
1084 rs->ti->error = "Not enough raid parameters given";
1085 return -EINVAL;
1086 }
92c83d79 1087
3fa6cf38 1088 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC))) {
4286325b 1089 if (test_and_set_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
bd83a4c4
MS
1090 rs->ti->error = "Only one 'nosync' argument allowed";
1091 return -EINVAL;
1092 }
9d09e663 1093 rs->md.recovery_cp = MaxSector;
9d09e663
N
1094 continue;
1095 }
3fa6cf38 1096 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC))) {
4286325b 1097 if (test_and_set_bit(__CTR_FLAG_SYNC, &rs->ctr_flags)) {
bd83a4c4
MS
1098 rs->ti->error = "Only one 'sync' argument allowed";
1099 return -EINVAL;
1100 }
9d09e663 1101 rs->md.recovery_cp = 0;
4763e543
HM
1102 continue;
1103 }
3fa6cf38 1104 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS))) {
4286325b 1105 if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
bd83a4c4
MS
1106 rs->ti->error = "Only one 'raid10_use_new_sets' argument allowed";
1107 return -EINVAL;
1108 }
9d09e663
N
1109 continue;
1110 }
1111
92c83d79
HM
1112 arg = dm_shift_arg(as);
1113 i++; /* Account for the argument pairs */
bd83a4c4
MS
1114 if (!arg) {
1115 rs->ti->error = "Wrong number of raid parameters given";
1116 return -EINVAL;
1117 }
63f33b8d 1118
702108d1
HM
1119 /*
1120 * Parameters that take a string value are checked here.
1121 */
1122
3fa6cf38 1123 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT))) {
4286325b 1124 if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags)) {
bd83a4c4
MS
1125 rs->ti->error = "Only one 'raid10_format' argument pair allowed";
1126 return -EINVAL;
1127 }
1128 if (!rt_is_raid10(rt)) {
1129 rs->ti->error = "'raid10_format' is an invalid parameter for this RAID type";
1130 return -EINVAL;
1131 }
33e53f06 1132 raid10_format = raid10_name_to_format(arg);
bd83a4c4
MS
1133 if (raid10_format < 0) {
1134 rs->ti->error = "Invalid 'raid10_format' value given";
1135 return raid10_format;
1136 }
63f33b8d
JB
1137 continue;
1138 }
1139
9dbd1aa3 1140 if (kstrtoint(arg, 10, &value) < 0) {
bd83a4c4
MS
1141 rs->ti->error = "Bad numerical argument given in raid params";
1142 return -EINVAL;
1143 }
702108d1 1144
3fa6cf38 1145 if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD))) {
702108d1
HM
1146 /*
1147 * "rebuild" is being passed in by userspace to provide
1148 * indexes of replaced devices and to set up additional
1149 * devices on raid level takeover.
43157840 1150 */
bb91a63f 1151 if (!__within_range(value, 0, rs->raid_disks - 1)) {
bd83a4c4
MS
1152 rs->ti->error = "Invalid rebuild index given";
1153 return -EINVAL;
1154 }
702108d1 1155
bd83a4c4
MS
1156 if (test_and_set_bit(value, (void *) rs->rebuild_disks)) {
1157 rs->ti->error = "rebuild for this index already given";
1158 return -EINVAL;
1159 }
ecbfb9f1 1160
702108d1
HM
1161 rd = rs->dev + value;
1162 clear_bit(In_sync, &rd->rdev.flags);
1163 clear_bit(Faulty, &rd->rdev.flags);
1164 rd->rdev.recovery_offset = 0;
4286325b 1165 set_bit(__CTR_FLAG_REBUILD, &rs->ctr_flags);
3fa6cf38 1166 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY))) {
bd83a4c4
MS
1167 if (!rt_is_raid1(rt)) {
1168 rs->ti->error = "write_mostly option is only valid for RAID1";
1169 return -EINVAL;
1170 }
702108d1 1171
bb91a63f 1172 if (!__within_range(value, 0, rs->md.raid_disks - 1)) {
bd83a4c4
MS
1173 rs->ti->error = "Invalid write_mostly index given";
1174 return -EINVAL;
1175 }
9d09e663 1176
5fa146b2 1177 write_mostly++;
46bed2b5 1178 set_bit(WriteMostly, &rs->dev[value].rdev.flags);
4286325b 1179 set_bit(__CTR_FLAG_WRITE_MOSTLY, &rs->ctr_flags);
3fa6cf38 1180 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND))) {
bd83a4c4
MS
1181 if (!rt_is_raid1(rt)) {
1182 rs->ti->error = "max_write_behind option is only valid for RAID1";
1183 return -EINVAL;
1184 }
702108d1 1185
4286325b 1186 if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags)) {
bd83a4c4
MS
1187 rs->ti->error = "Only one max_write_behind argument pair allowed";
1188 return -EINVAL;
1189 }
9d09e663
N
1190
1191 /*
1192 * In device-mapper, we specify things in sectors, but
1193 * MD records this value in kB
1194 */
1195 value /= 2;
bd83a4c4
MS
1196 if (value > COUNTER_MAX) {
1197 rs->ti->error = "Max write-behind limit out of range";
1198 return -EINVAL;
1199 }
702108d1 1200
9d09e663 1201 rs->md.bitmap_info.max_write_behind = value;
3fa6cf38 1202 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP))) {
4286325b 1203 if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags)) {
bd83a4c4
MS
1204 rs->ti->error = "Only one daemon_sleep argument pair allowed";
1205 return -EINVAL;
1206 }
1207 if (!value || (value > MAX_SCHEDULE_TIMEOUT)) {
1208 rs->ti->error = "daemon sleep period out of range";
1209 return -EINVAL;
1210 }
9d09e663 1211 rs->md.bitmap_info.daemon_sleep = value;
3fa6cf38 1212 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET))) {
4763e543 1213 /* Userspace passes new data_offset after having extended the the data image LV */
4286325b 1214 if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
bd83a4c4
MS
1215 rs->ti->error = "Only one data_offset argument pair allowed";
1216 return -EINVAL;
1217 }
4763e543 1218 /* Ensure sensible data offset */
75dd3b9e
HM
1219 if (value < 0 ||
1220 (value && (value < MIN_FREE_RESHAPE_SPACE || value % to_sector(PAGE_SIZE)))) {
bd83a4c4
MS
1221 rs->ti->error = "Bogus data_offset value";
1222 return -EINVAL;
1223 }
4763e543 1224 rs->data_offset = value;
3fa6cf38 1225 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS))) {
4763e543 1226 /* Define the +/-# of disks to add to/remove from the given raid set */
4286325b 1227 if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
bd83a4c4
MS
1228 rs->ti->error = "Only one delta_disks argument pair allowed";
1229 return -EINVAL;
1230 }
4763e543 1231 /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */
bb91a63f 1232 if (!__within_range(abs(value), 1, MAX_RAID_DEVICES - rt->minimal_devs)) {
bd83a4c4
MS
1233 rs->ti->error = "Too many delta_disk requested";
1234 return -EINVAL;
1235 }
4763e543
HM
1236
1237 rs->delta_disks = value;
3fa6cf38 1238 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE))) {
4286325b 1239 if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags)) {
bd83a4c4
MS
1240 rs->ti->error = "Only one stripe_cache argument pair allowed";
1241 return -EINVAL;
1242 }
1243
bd83a4c4
MS
1244 if (!rt_is_raid456(rt)) {
1245 rs->ti->error = "Inappropriate argument: stripe_cache";
1246 return -EINVAL;
1247 }
702108d1 1248
9dbd1aa3 1249 rs->stripe_cache_entries = value;
3fa6cf38 1250 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE))) {
4286325b 1251 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
bd83a4c4
MS
1252 rs->ti->error = "Only one min_recovery_rate argument pair allowed";
1253 return -EINVAL;
1254 }
1255 if (value > INT_MAX) {
1256 rs->ti->error = "min_recovery_rate out of range";
1257 return -EINVAL;
1258 }
9d09e663 1259 rs->md.sync_speed_min = (int)value;
3fa6cf38 1260 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE))) {
4286325b 1261 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags)) {
bd83a4c4
MS
1262 rs->ti->error = "Only one max_recovery_rate argument pair allowed";
1263 return -EINVAL;
1264 }
1265 if (value > INT_MAX) {
1266 rs->ti->error = "max_recovery_rate out of range";
1267 return -EINVAL;
1268 }
9d09e663 1269 rs->md.sync_speed_max = (int)value;
3fa6cf38 1270 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE))) {
4286325b 1271 if (test_and_set_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags)) {
bd83a4c4
MS
1272 rs->ti->error = "Only one region_size argument pair allowed";
1273 return -EINVAL;
1274 }
702108d1 1275
c1084561 1276 region_size = value;
4257e085 1277 rs->requested_bitmap_chunk_sectors = value;
3fa6cf38 1278 } else if (!strcasecmp(key, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES))) {
4286325b 1279 if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags)) {
bd83a4c4
MS
1280 rs->ti->error = "Only one raid10_copies argument pair allowed";
1281 return -EINVAL;
1282 }
702108d1 1283
bb91a63f 1284 if (!__within_range(value, 2, rs->md.raid_disks)) {
bd83a4c4
MS
1285 rs->ti->error = "Bad value for 'raid10_copies'";
1286 return -EINVAL;
1287 }
702108d1 1288
63f33b8d 1289 raid10_copies = value;
9d09e663
N
1290 } else {
1291 DMERR("Unable to parse RAID parameter: %s", key);
bd83a4c4
MS
1292 rs->ti->error = "Unable to parse RAID parameter";
1293 return -EINVAL;
9d09e663
N
1294 }
1295 }
1296
0d851d14
HM
1297 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags) &&
1298 test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
1299 rs->ti->error = "sync and nosync are mutually exclusive";
1300 return -EINVAL;
1301 }
1302
5fa146b2
HM
1303 if (write_mostly >= rs->md.raid_disks) {
1304 rs->ti->error = "Can't set all raid1 devices to write_mostly";
1305 return -EINVAL;
1306 }
1307
c1084561
JB
1308 if (validate_region_size(rs, region_size))
1309 return -EINVAL;
1310
1311 if (rs->md.chunk_sectors)
542f9038 1312 max_io_len = rs->md.chunk_sectors;
c1084561 1313 else
542f9038 1314 max_io_len = region_size;
c1084561 1315
542f9038
MS
1316 if (dm_set_target_max_io_len(rs->ti, max_io_len))
1317 return -EINVAL;
32737279 1318
33e53f06 1319 if (rt_is_raid10(rt)) {
bd83a4c4
MS
1320 if (raid10_copies > rs->md.raid_disks) {
1321 rs->ti->error = "Not enough devices to satisfy specification";
1322 return -EINVAL;
1323 }
63f33b8d 1324
33e53f06 1325 rs->md.new_layout = raid10_format_to_md_layout(rs, raid10_format, raid10_copies);
bd83a4c4
MS
1326 if (rs->md.new_layout < 0) {
1327 rs->ti->error = "Error getting raid10 format";
1328 return rs->md.new_layout;
1329 }
33e53f06
HM
1330
1331 rt = get_raid_type_by_ll(10, rs->md.new_layout);
bd83a4c4
MS
1332 if (!rt) {
1333 rs->ti->error = "Failed to recognize new raid10 layout";
1334 return -EINVAL;
1335 }
33e53f06
HM
1336
1337 if ((rt->algorithm == ALGORITHM_RAID10_DEFAULT ||
1338 rt->algorithm == ALGORITHM_RAID10_NEAR) &&
4286325b 1339 test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS, &rs->ctr_flags)) {
bd83a4c4
MS
1340 rs->ti->error = "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible";
1341 return -EINVAL;
1342 }
bd83a4c4 1343 }
702108d1 1344
33e53f06 1345 rs->raid10_copies = raid10_copies;
c039c332 1346
9d09e663
N
1347 /* Assume there are no metadata devices until the drives are parsed */
1348 rs->md.persistent = 0;
1349 rs->md.external = 1;
1350
f090279e 1351 /* Check, if any invalid ctr arguments have been passed in for the raid level */
a30cbc0d 1352 return rs_check_for_valid_flags(rs);
9d09e663
N
1353}
1354
9dbd1aa3
HM
1355/* Set raid4/5/6 cache size */
1356static int rs_set_raid456_stripe_cache(struct raid_set *rs)
1357{
1358 int r;
1359 struct r5conf *conf;
1360 struct mddev *mddev = &rs->md;
1361 uint32_t min_stripes = max(mddev->chunk_sectors, mddev->new_chunk_sectors) / 2;
1362 uint32_t nr_stripes = rs->stripe_cache_entries;
1363
1364 if (!rt_is_raid456(rs->raid_type)) {
1365 rs->ti->error = "Inappropriate raid level; cannot change stripe_cache size";
1366 return -EINVAL;
1367 }
1368
1369 if (nr_stripes < min_stripes) {
1370 DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size",
1371 nr_stripes, min_stripes);
1372 nr_stripes = min_stripes;
1373 }
1374
1375 conf = mddev->private;
1376 if (!conf) {
1377 rs->ti->error = "Cannot change stripe_cache size on inactive RAID set";
1378 return -EINVAL;
1379 }
1380
1381 /* Try setting number of stripes in raid456 stripe cache */
1382 if (conf->min_nr_stripes != nr_stripes) {
1383 r = raid5_set_cache_size(mddev, nr_stripes);
1384 if (r) {
1385 rs->ti->error = "Failed to set raid4/5/6 stripe cache size";
1386 return r;
1387 }
1388
1389 DMINFO("%u stripe cache entries", nr_stripes);
1390 }
1391
1392 return 0;
1393}
1394
3a1c1ef2
HM
1395/* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */
1396static unsigned int mddev_data_stripes(struct raid_set *rs)
1397{
1398 return rs->md.raid_disks - rs->raid_type->parity_devs;
1399}
1400
40ba37e5
HM
1401/* Return # of data stripes of @rs (i.e. as of ctr) */
1402static unsigned int rs_data_stripes(struct raid_set *rs)
1403{
1404 return rs->raid_disks - rs->raid_type->parity_devs;
1405}
1406
1407/* Calculate the sectors per device and per array used for @rs */
1408static int rs_set_dev_and_array_sectors(struct raid_set *rs, bool use_mddev)
1409{
1410 int delta_disks;
1411 unsigned int data_stripes;
1412 struct mddev *mddev = &rs->md;
1413 struct md_rdev *rdev;
1414 sector_t array_sectors = rs->ti->len, dev_sectors = rs->ti->len;
9dbd1aa3 1415 sector_t cur_dev_sectors = rs->dev[0].rdev.sectors;
40ba37e5
HM
1416
1417 if (use_mddev) {
1418 delta_disks = mddev->delta_disks;
1419 data_stripes = mddev_data_stripes(rs);
1420 } else {
1421 delta_disks = rs->delta_disks;
1422 data_stripes = rs_data_stripes(rs);
1423 }
1424
1425 /* Special raid1 case w/o delta_disks support (yet) */
1426 if (rt_is_raid1(rs->raid_type))
1427 ;
1428 else if (rt_is_raid10(rs->raid_type)) {
1429 if (rs->raid10_copies < 2 ||
1430 delta_disks < 0) {
1431 rs->ti->error = "Bogus raid10 data copies or delta disks";
1432 return EINVAL;
1433 }
1434
1435 dev_sectors *= rs->raid10_copies;
1436 if (sector_div(dev_sectors, data_stripes))
1437 goto bad;
1438
1439 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1440 if (sector_div(array_sectors, rs->raid10_copies))
1441 goto bad;
1442
1443 } else if (sector_div(dev_sectors, data_stripes))
1444 goto bad;
1445
1446 else
1447 /* Striped layouts */
1448 array_sectors = (data_stripes + delta_disks) * dev_sectors;
1449
1450 rdev_for_each(rdev, mddev)
1451 rdev->sectors = dev_sectors;
1452
1453 mddev->array_sectors = array_sectors;
1454 mddev->dev_sectors = dev_sectors;
1455
9dbd1aa3
HM
1456 if (!rs_is_raid0(rs) && dev_sectors > cur_dev_sectors)
1457 mddev->recovery_cp = dev_sectors;
1458
40ba37e5
HM
1459 return 0;
1460bad:
1461 rs->ti->error = "Target length not divisible by number of data devices";
1462 return EINVAL;
1463}
1464
9d09e663
N
1465static void do_table_event(struct work_struct *ws)
1466{
1467 struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
1468
9d9d939c
HM
1469 smp_rmb(); /* Make sure we access most actual mddev properties */
1470 if (!rs_is_reshaping(rs))
1471 rs_set_capacity(rs);
9d09e663
N
1472 dm_table_event(rs->ti->table);
1473}
1474
1475static int raid_is_congested(struct dm_target_callbacks *cb, int bits)
1476{
1477 struct raid_set *rs = container_of(cb, struct raid_set, callbacks);
1478
5c675f83 1479 return mddev_congested(&rs->md, bits);
9d09e663
N
1480}
1481
ecbfb9f1
HM
1482/*
1483 * Make sure a valid takover (level switch) is being requested on @rs
1484 *
1485 * Conversions of raid sets from one MD personality to another
1486 * have to conform to restrictions which are enforced here.
ecbfb9f1
HM
1487 */
1488static int rs_check_takeover(struct raid_set *rs)
1489{
1490 struct mddev *mddev = &rs->md;
1491 unsigned int near_copies;
1492
9dbd1aa3
HM
1493 if (rs->md.degraded) {
1494 rs->ti->error = "Can't takeover degraded raid set";
1495 return -EPERM;
1496 }
1497
1498 if (rs_is_reshaping(rs)) {
1499 rs->ti->error = "Can't takeover reshaping raid set";
1500 return -EPERM;
1501 }
1502
ecbfb9f1
HM
1503 switch (mddev->level) {
1504 case 0:
1505 /* raid0 -> raid1/5 with one disk */
1506 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1507 mddev->raid_disks == 1)
1508 return 0;
1509
1510 /* raid0 -> raid10 */
1511 if (mddev->new_level == 10 &&
9dbd1aa3 1512 !(rs->raid_disks % mddev->raid_disks))
ecbfb9f1
HM
1513 return 0;
1514
1515 /* raid0 with multiple disks -> raid4/5/6 */
bb91a63f 1516 if (__within_range(mddev->new_level, 4, 6) &&
ecbfb9f1
HM
1517 mddev->new_layout == ALGORITHM_PARITY_N &&
1518 mddev->raid_disks > 1)
1519 return 0;
1520
1521 break;
1522
1523 case 10:
1524 /* Can't takeover raid10_offset! */
e6ca5e1a 1525 if (__is_raid10_offset(mddev->layout))
ecbfb9f1
HM
1526 break;
1527
e6ca5e1a 1528 near_copies = __raid10_near_copies(mddev->layout);
ecbfb9f1
HM
1529
1530 /* raid10* -> raid0 */
1531 if (mddev->new_level == 0) {
1532 /* Can takeover raid10_near with raid disks divisable by data copies! */
1533 if (near_copies > 1 &&
1534 !(mddev->raid_disks % near_copies)) {
1535 mddev->raid_disks /= near_copies;
1536 mddev->delta_disks = mddev->raid_disks;
1537 return 0;
1538 }
1539
1540 /* Can takeover raid10_far */
1541 if (near_copies == 1 &&
e6ca5e1a 1542 __raid10_far_copies(mddev->layout) > 1)
ecbfb9f1
HM
1543 return 0;
1544
1545 break;
1546 }
1547
1548 /* raid10_{near,far} -> raid1 */
1549 if (mddev->new_level == 1 &&
e6ca5e1a 1550 max(near_copies, __raid10_far_copies(mddev->layout)) == mddev->raid_disks)
ecbfb9f1
HM
1551 return 0;
1552
1553 /* raid10_{near,far} with 2 disks -> raid4/5 */
bb91a63f 1554 if (__within_range(mddev->new_level, 4, 5) &&
ecbfb9f1
HM
1555 mddev->raid_disks == 2)
1556 return 0;
1557 break;
1558
1559 case 1:
1560 /* raid1 with 2 disks -> raid4/5 */
bb91a63f 1561 if (__within_range(mddev->new_level, 4, 5) &&
ecbfb9f1
HM
1562 mddev->raid_disks == 2) {
1563 mddev->degraded = 1;
1564 return 0;
1565 }
1566
1567 /* raid1 -> raid0 */
1568 if (mddev->new_level == 0 &&
1569 mddev->raid_disks == 1)
1570 return 0;
1571
1572 /* raid1 -> raid10 */
1573 if (mddev->new_level == 10)
1574 return 0;
1575
1576 break;
1577
1578 case 4:
1579 /* raid4 -> raid0 */
1580 if (mddev->new_level == 0)
1581 return 0;
1582
1583 /* raid4 -> raid1/5 with 2 disks */
1584 if ((mddev->new_level == 1 || mddev->new_level == 5) &&
1585 mddev->raid_disks == 2)
1586 return 0;
1587
1588 /* raid4 -> raid5/6 with parity N */
bb91a63f 1589 if (__within_range(mddev->new_level, 5, 6) &&
ecbfb9f1
HM
1590 mddev->layout == ALGORITHM_PARITY_N)
1591 return 0;
1592 break;
1593
1594 case 5:
1595 /* raid5 with parity N -> raid0 */
1596 if (mddev->new_level == 0 &&
1597 mddev->layout == ALGORITHM_PARITY_N)
1598 return 0;
1599
1600 /* raid5 with parity N -> raid4 */
1601 if (mddev->new_level == 4 &&
1602 mddev->layout == ALGORITHM_PARITY_N)
1603 return 0;
1604
1605 /* raid5 with 2 disks -> raid1/4/10 */
1606 if ((mddev->new_level == 1 || mddev->new_level == 4 || mddev->new_level == 10) &&
1607 mddev->raid_disks == 2)
1608 return 0;
1609
6ee0bae9 1610 /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */
ecbfb9f1
HM
1611 if (mddev->new_level == 6 &&
1612 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
bb91a63f 1613 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC_6, ALGORITHM_RIGHT_SYMMETRIC_6)))
ecbfb9f1
HM
1614 return 0;
1615 break;
1616
1617 case 6:
1618 /* raid6 with parity N -> raid0 */
1619 if (mddev->new_level == 0 &&
1620 mddev->layout == ALGORITHM_PARITY_N)
1621 return 0;
1622
1623 /* raid6 with parity N -> raid4 */
1624 if (mddev->new_level == 4 &&
1625 mddev->layout == ALGORITHM_PARITY_N)
1626 return 0;
1627
6ee0bae9 1628 /* raid6_*_n with Q-Syndrome N -> raid5_* */
ecbfb9f1
HM
1629 if (mddev->new_level == 5 &&
1630 ((mddev->layout == ALGORITHM_PARITY_N && mddev->new_layout == ALGORITHM_PARITY_N) ||
bb91a63f 1631 __within_range(mddev->new_layout, ALGORITHM_LEFT_ASYMMETRIC, ALGORITHM_RIGHT_SYMMETRIC)))
ecbfb9f1
HM
1632 return 0;
1633
1634 default:
1635 break;
1636 }
1637
bd83a4c4
MS
1638 rs->ti->error = "takeover not possible";
1639 return -EINVAL;
ecbfb9f1
HM
1640}
1641
1642/* True if @rs requested to be taken over */
1643static bool rs_takeover_requested(struct raid_set *rs)
1644{
1645 return rs->md.new_level != rs->md.level;
1646}
1647
40ba37e5
HM
1648/* True if @rs is requested to reshape by ctr */
1649static bool rs_reshape_requested(struct raid_set *rs)
1650{
1651 struct mddev *mddev = &rs->md;
1652
1653 if (!mddev->level)
1654 return false;
1655
1656 return !__is_raid10_far(mddev->new_layout) &&
1657 mddev->new_level == mddev->level &&
1658 (mddev->new_layout != mddev->layout ||
1659 mddev->new_chunk_sectors != mddev->chunk_sectors ||
1660 rs->raid_disks + rs->delta_disks != mddev->raid_disks);
1661}
1662
33e53f06 1663/* Features */
9b6e5423 1664#define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */
33e53f06
HM
1665
1666/* State flags for sb->flags */
1667#define SB_FLAG_RESHAPE_ACTIVE 0x1
1668#define SB_FLAG_RESHAPE_BACKWARDS 0x2
1669
b12d437b
JB
1670/*
1671 * This structure is never routinely used by userspace, unlike md superblocks.
1672 * Devices with this superblock should only ever be accessed via device-mapper.
1673 */
1674#define DM_RAID_MAGIC 0x64526D44
1675struct dm_raid_superblock {
1676 __le32 magic; /* "DmRd" */
9b6e5423 1677 __le32 compat_features; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */
b12d437b 1678
33e53f06
HM
1679 __le32 num_devices; /* Number of devices in this raid set. (Max 64) */
1680 __le32 array_position; /* The position of this drive in the raid set */
b12d437b
JB
1681
1682 __le64 events; /* Incremented by md when superblock updated */
9b6e5423 1683 __le64 failed_devices; /* Pre 1.9.0 part of bit field of devices to */
33e53f06 1684 /* indicate failures (see extension below) */
b12d437b
JB
1685
1686 /*
1687 * This offset tracks the progress of the repair or replacement of
1688 * an individual drive.
1689 */
1690 __le64 disk_recovery_offset;
1691
1692 /*
33e53f06 1693 * This offset tracks the progress of the initial raid set
b12d437b
JB
1694 * synchronisation/parity calculation.
1695 */
1696 __le64 array_resync_offset;
1697
1698 /*
33e53f06 1699 * raid characteristics
b12d437b
JB
1700 */
1701 __le32 level;
1702 __le32 layout;
1703 __le32 stripe_sectors;
1704
33e53f06 1705 /********************************************************************
9b6e5423 1706 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
33e53f06 1707 *
9b6e5423 1708 * FEATURE_FLAG_SUPPORTS_V190 in the features member indicates that those exist
33e53f06
HM
1709 */
1710
1711 __le32 flags; /* Flags defining array states for reshaping */
1712
1713 /*
1714 * This offset tracks the progress of a raid
1715 * set reshape in order to be able to restart it
1716 */
1717 __le64 reshape_position;
1718
1719 /*
1720 * These define the properties of the array in case of an interrupted reshape
1721 */
1722 __le32 new_level;
1723 __le32 new_layout;
1724 __le32 new_stripe_sectors;
1725 __le32 delta_disks;
1726
1727 __le64 array_sectors; /* Array size in sectors */
1728
1729 /*
1730 * Sector offsets to data on devices (reshaping).
1731 * Needed to support out of place reshaping, thus
1732 * not writing over any stripes whilst converting
1733 * them from old to new layout
1734 */
1735 __le64 data_offset;
1736 __le64 new_data_offset;
1737
1738 __le64 sectors; /* Used device size in sectors */
1739
1740 /*
1741 * Additonal Bit field of devices indicating failures to support
9b6e5423 1742 * up to 256 devices with the 1.9.0 on-disk metadata format
33e53f06
HM
1743 */
1744 __le64 extended_failed_devices[DISKS_ARRAY_ELEMS - 1];
1745
1746 __le32 incompat_features; /* Used to indicate any incompatible features */
1747
1748 /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */
b12d437b
JB
1749} __packed;
1750
9dbd1aa3
HM
1751/*
1752 * Check for reshape constraints on raid set @rs:
1753 *
1754 * - reshape function non-existent
1755 * - degraded set
1756 * - ongoing recovery
1757 * - ongoing reshape
1758 *
1759 * Returns 0 if none or -EPERM if given constraint
1760 * and error message reference in @errmsg
1761 */
1762static int rs_check_reshape(struct raid_set *rs)
1763{
1764 struct mddev *mddev = &rs->md;
1765
9dbd1aa3
HM
1766 if (!mddev->pers || !mddev->pers->check_reshape)
1767 rs->ti->error = "Reshape not supported";
1768 else if (mddev->degraded)
1769 rs->ti->error = "Can't reshape degraded raid set";
1770 else if (rs_is_recovering(rs))
1771 rs->ti->error = "Convert request on recovering raid set prohibited";
1772 else if (mddev->reshape_position && rs_is_reshaping(rs))
1773 rs->ti->error = "raid set already reshaping!";
1774 else if (!(rs_is_raid10(rs) || rs_is_raid456(rs)))
1775 rs->ti->error = "Reshaping only supported for raid4/5/6/10";
1776 else
1777 return 0;
1778
1779 return -EPERM;
1780}
1781
3cb03002 1782static int read_disk_sb(struct md_rdev *rdev, int size)
b12d437b
JB
1783{
1784 BUG_ON(!rdev->sb_page);
1785
1786 if (rdev->sb_loaded)
1787 return 0;
1788
0a7b8188 1789 if (!sync_page_io(rdev, 0, size, rdev->sb_page, REQ_OP_READ, 0, true)) {
0447568f
JB
1790 DMERR("Failed to read superblock of device at position %d",
1791 rdev->raid_disk);
c32fb9e7 1792 md_error(rdev->mddev, rdev);
b12d437b
JB
1793 return -EINVAL;
1794 }
1795
1796 rdev->sb_loaded = 1;
1797
1798 return 0;
1799}
1800
33e53f06
HM
1801static void sb_retrieve_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
1802{
1803 failed_devices[0] = le64_to_cpu(sb->failed_devices);
1804 memset(failed_devices + 1, 0, sizeof(sb->extended_failed_devices));
1805
4286325b 1806 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
33e53f06
HM
1807 int i = ARRAY_SIZE(sb->extended_failed_devices);
1808
1809 while (i--)
1810 failed_devices[i+1] = le64_to_cpu(sb->extended_failed_devices[i]);
1811 }
1812}
1813
7b34df74
HM
1814static void sb_update_failed_devices(struct dm_raid_superblock *sb, uint64_t *failed_devices)
1815{
1816 int i = ARRAY_SIZE(sb->extended_failed_devices);
1817
1818 sb->failed_devices = cpu_to_le64(failed_devices[0]);
1819 while (i--)
1820 sb->extended_failed_devices[i] = cpu_to_le64(failed_devices[i+1]);
1821}
1822
1823/*
1824 * Synchronize the superblock members with the raid set properties
1825 *
1826 * All superblock data is little endian.
1827 */
fd01b88c 1828static void super_sync(struct mddev *mddev, struct md_rdev *rdev)
b12d437b 1829{
7b34df74
HM
1830 bool update_failed_devices = false;
1831 unsigned int i;
1832 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
b12d437b 1833 struct dm_raid_superblock *sb;
81f382f9 1834 struct raid_set *rs = container_of(mddev, struct raid_set, md);
b12d437b 1835
7b34df74
HM
1836 /* No metadata device, no superblock */
1837 if (!rdev->meta_bdev)
1838 return;
1839
1840 BUG_ON(!rdev->sb_page);
1841
b12d437b 1842 sb = page_address(rdev->sb_page);
b12d437b 1843
7b34df74 1844 sb_retrieve_failed_devices(sb, failed_devices);
b12d437b 1845
7b34df74
HM
1846 for (i = 0; i < rs->raid_disks; i++)
1847 if (!rs->dev[i].data_dev || test_bit(Faulty, &rs->dev[i].rdev.flags)) {
1848 update_failed_devices = true;
1849 set_bit(i, (void *) failed_devices);
1850 }
1851
1852 if (update_failed_devices)
1853 sb_update_failed_devices(sb, failed_devices);
b12d437b
JB
1854
1855 sb->magic = cpu_to_le32(DM_RAID_MAGIC);
9b6e5423 1856 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
b12d437b
JB
1857
1858 sb->num_devices = cpu_to_le32(mddev->raid_disks);
1859 sb->array_position = cpu_to_le32(rdev->raid_disk);
1860
1861 sb->events = cpu_to_le64(mddev->events);
b12d437b
JB
1862
1863 sb->disk_recovery_offset = cpu_to_le64(rdev->recovery_offset);
1864 sb->array_resync_offset = cpu_to_le64(mddev->recovery_cp);
1865
1866 sb->level = cpu_to_le32(mddev->level);
1867 sb->layout = cpu_to_le32(mddev->layout);
1868 sb->stripe_sectors = cpu_to_le32(mddev->chunk_sectors);
7b34df74
HM
1869
1870 sb->new_level = cpu_to_le32(mddev->new_level);
1871 sb->new_layout = cpu_to_le32(mddev->new_layout);
1872 sb->new_stripe_sectors = cpu_to_le32(mddev->new_chunk_sectors);
1873
1874 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1875
1876 smp_rmb(); /* Make sure we access most recent reshape position */
1877 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1878 if (le64_to_cpu(sb->reshape_position) != MaxSector) {
1879 /* Flag ongoing reshape */
1880 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE);
1881
1882 if (mddev->delta_disks < 0 || mddev->reshape_backwards)
1883 sb->flags |= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS);
4286325b
MS
1884 } else {
1885 /* Clear reshape flags */
1886 sb->flags &= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE|SB_FLAG_RESHAPE_BACKWARDS));
1887 }
7b34df74
HM
1888
1889 sb->array_sectors = cpu_to_le64(mddev->array_sectors);
1890 sb->data_offset = cpu_to_le64(rdev->data_offset);
1891 sb->new_data_offset = cpu_to_le64(rdev->new_data_offset);
1892 sb->sectors = cpu_to_le64(rdev->sectors);
1893
1894 /* Zero out the rest of the payload after the size of the superblock */
1895 memset(sb + 1, 0, rdev->sb_size - sizeof(*sb));
b12d437b
JB
1896}
1897
1898/*
1899 * super_load
1900 *
1901 * This function creates a superblock if one is not found on the device
1902 * and will decide which superblock to use if there's a choice.
1903 *
1904 * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
1905 */
3cb03002 1906static int super_load(struct md_rdev *rdev, struct md_rdev *refdev)
b12d437b 1907{
73c6f239 1908 int r;
b12d437b
JB
1909 struct dm_raid_superblock *sb;
1910 struct dm_raid_superblock *refsb;
1911 uint64_t events_sb, events_refsb;
1912
1913 rdev->sb_start = 0;
40d43c4b
HM
1914 rdev->sb_size = bdev_logical_block_size(rdev->meta_bdev);
1915 if (rdev->sb_size < sizeof(*sb) || rdev->sb_size > PAGE_SIZE) {
1916 DMERR("superblock size of a logical block is no longer valid");
1917 return -EINVAL;
1918 }
b12d437b 1919
73c6f239
HM
1920 r = read_disk_sb(rdev, rdev->sb_size);
1921 if (r)
1922 return r;
b12d437b
JB
1923
1924 sb = page_address(rdev->sb_page);
3aa3b2b2
JB
1925
1926 /*
1927 * Two cases that we want to write new superblocks and rebuild:
1928 * 1) New device (no matching magic number)
1929 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
1930 */
1931 if ((sb->magic != cpu_to_le32(DM_RAID_MAGIC)) ||
1932 (!test_bit(In_sync, &rdev->flags) && !rdev->recovery_offset)) {
b12d437b
JB
1933 super_sync(rdev->mddev, rdev);
1934
1935 set_bit(FirstUse, &rdev->flags);
9b6e5423 1936 sb->compat_features = cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190);
b12d437b
JB
1937
1938 /* Force writing of superblocks to disk */
1939 set_bit(MD_CHANGE_DEVS, &rdev->mddev->flags);
1940
1941 /* Any superblock is better than none, choose that if given */
1942 return refdev ? 0 : 1;
1943 }
1944
1945 if (!refdev)
1946 return 1;
1947
1948 events_sb = le64_to_cpu(sb->events);
1949
1950 refsb = page_address(refdev->sb_page);
1951 events_refsb = le64_to_cpu(refsb->events);
1952
1953 return (events_sb > events_refsb) ? 1 : 0;
1954}
1955
33e53f06 1956static int super_init_validation(struct raid_set *rs, struct md_rdev *rdev)
b12d437b
JB
1957{
1958 int role;
33e53f06
HM
1959 unsigned int d;
1960 struct mddev *mddev = &rs->md;
b12d437b 1961 uint64_t events_sb;
33e53f06 1962 uint64_t failed_devices[DISKS_ARRAY_ELEMS];
b12d437b 1963 struct dm_raid_superblock *sb;
33e53f06 1964 uint32_t new_devs = 0, rebuild_and_new = 0, rebuilds = 0;
dafb20fa 1965 struct md_rdev *r;
b12d437b
JB
1966 struct dm_raid_superblock *sb2;
1967
1968 sb = page_address(rdev->sb_page);
1969 events_sb = le64_to_cpu(sb->events);
b12d437b
JB
1970
1971 /*
1972 * Initialise to 1 if this is a new superblock.
1973 */
1974 mddev->events = events_sb ? : 1;
1975
33e53f06
HM
1976 mddev->reshape_position = MaxSector;
1977
b12d437b 1978 /*
33e53f06
HM
1979 * Reshaping is supported, e.g. reshape_position is valid
1980 * in superblock and superblock content is authoritative.
b12d437b 1981 */
4286325b 1982 if (le32_to_cpu(sb->compat_features) & FEATURE_FLAG_SUPPORTS_V190) {
33e53f06
HM
1983 /* Superblock is authoritative wrt given raid set layout! */
1984 mddev->raid_disks = le32_to_cpu(sb->num_devices);
1985 mddev->level = le32_to_cpu(sb->level);
1986 mddev->layout = le32_to_cpu(sb->layout);
1987 mddev->chunk_sectors = le32_to_cpu(sb->stripe_sectors);
1988 mddev->new_level = le32_to_cpu(sb->new_level);
1989 mddev->new_layout = le32_to_cpu(sb->new_layout);
1990 mddev->new_chunk_sectors = le32_to_cpu(sb->new_stripe_sectors);
1991 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1992 mddev->array_sectors = le64_to_cpu(sb->array_sectors);
1993
1994 /* raid was reshaping and got interrupted */
4286325b
MS
1995 if (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_ACTIVE) {
1996 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags)) {
33e53f06
HM
1997 DMERR("Reshape requested but raid set is still reshaping");
1998 return -EINVAL;
1999 }
b12d437b 2000
33e53f06 2001 if (mddev->delta_disks < 0 ||
4286325b 2002 (!mddev->delta_disks && (le32_to_cpu(sb->flags) & SB_FLAG_RESHAPE_BACKWARDS)))
33e53f06
HM
2003 mddev->reshape_backwards = 1;
2004 else
2005 mddev->reshape_backwards = 0;
2006
2007 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
2008 rs->raid_type = get_raid_type_by_ll(mddev->level, mddev->layout);
2009 }
2010
2011 } else {
2012 /*
9b6e5423 2013 * No takeover/reshaping, because we don't have the extended v1.9.0 metadata
33e53f06
HM
2014 */
2015 if (le32_to_cpu(sb->level) != mddev->level) {
2016 DMERR("Reshaping/takeover raid sets not yet supported. (raid level/stripes/size change)");
2017 return -EINVAL;
2018 }
2019 if (le32_to_cpu(sb->layout) != mddev->layout) {
2020 DMERR("Reshaping raid sets not yet supported. (raid layout change)");
43157840
MS
2021 DMERR(" 0x%X vs 0x%X", le32_to_cpu(sb->layout), mddev->layout);
2022 DMERR(" Old layout: %s w/ %d copies",
33e53f06
HM
2023 raid10_md_layout_to_format(le32_to_cpu(sb->layout)),
2024 raid10_md_layout_to_copies(le32_to_cpu(sb->layout)));
43157840 2025 DMERR(" New layout: %s w/ %d copies",
33e53f06
HM
2026 raid10_md_layout_to_format(mddev->layout),
2027 raid10_md_layout_to_copies(mddev->layout));
2028 return -EINVAL;
2029 }
2030 if (le32_to_cpu(sb->stripe_sectors) != mddev->chunk_sectors) {
2031 DMERR("Reshaping raid sets not yet supported. (stripe sectors change)");
2032 return -EINVAL;
2033 }
2034
2035 /* We can only change the number of devices in raid1 with old (i.e. pre 1.0.7) metadata */
2036 if (!rt_is_raid1(rs->raid_type) &&
2037 (le32_to_cpu(sb->num_devices) != mddev->raid_disks)) {
2038 DMERR("Reshaping raid sets not yet supported. (device count change from %u to %u)",
2039 sb->num_devices, mddev->raid_disks);
2040 return -EINVAL;
2041 }
2042
2043 /* Table line is checked vs. authoritative superblock */
2044 rs_set_new(rs);
b12d437b
JB
2045 }
2046
4286325b 2047 if (!test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
b12d437b
JB
2048 mddev->recovery_cp = le64_to_cpu(sb->array_resync_offset);
2049
2050 /*
2051 * During load, we set FirstUse if a new superblock was written.
2052 * There are two reasons we might not have a superblock:
33e53f06 2053 * 1) The raid set is brand new - in which case, all of the
43157840 2054 * devices must have their In_sync bit set. Also,
b12d437b 2055 * recovery_cp must be 0, unless forced.
33e53f06 2056 * 2) This is a new device being added to an old raid set
b12d437b
JB
2057 * and the new device needs to be rebuilt - in which
2058 * case the In_sync bit will /not/ be set and
2059 * recovery_cp must be MaxSector.
9dbd1aa3
HM
2060 * 3) This is/are a new device(s) being added to an old
2061 * raid set during takeover to a higher raid level
2062 * to provide capacity for redundancy or during reshape
2063 * to add capacity to grow the raid set.
b12d437b 2064 */
33e53f06 2065 d = 0;
dafb20fa 2066 rdev_for_each(r, mddev) {
33e53f06
HM
2067 if (test_bit(FirstUse, &r->flags))
2068 new_devs++;
2069
b12d437b 2070 if (!test_bit(In_sync, &r->flags)) {
33e53f06
HM
2071 DMINFO("Device %d specified for rebuild; clearing superblock",
2072 r->raid_disk);
b12d437b 2073 rebuilds++;
33e53f06
HM
2074
2075 if (test_bit(FirstUse, &r->flags))
2076 rebuild_and_new++;
2077 }
2078
2079 d++;
b12d437b
JB
2080 }
2081
33e53f06
HM
2082 if (new_devs == rs->raid_disks || !rebuilds) {
2083 /* Replace a broken device */
2084 if (new_devs == 1 && !rs->delta_disks)
2085 ;
2086 if (new_devs == rs->raid_disks) {
2087 DMINFO("Superblocks created for new raid set");
b12d437b 2088 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
33e53f06 2089 mddev->recovery_cp = 0;
9dbd1aa3
HM
2090 } else if (new_devs != rebuilds &&
2091 new_devs != rs->delta_disks) {
33e53f06
HM
2092 DMERR("New device injected into existing raid set without "
2093 "'delta_disks' or 'rebuild' parameter specified");
b12d437b
JB
2094 return -EINVAL;
2095 }
33e53f06
HM
2096 } else if (new_devs && new_devs != rebuilds) {
2097 DMERR("%u 'rebuild' devices cannot be injected into"
2098 " a raid set with %u other first-time devices",
2099 rebuilds, new_devs);
b12d437b 2100 return -EINVAL;
33e53f06
HM
2101 } else if (rebuilds) {
2102 if (rebuild_and_new && rebuilds != rebuild_and_new) {
2103 DMERR("new device%s provided without 'rebuild'",
2104 new_devs > 1 ? "s" : "");
2105 return -EINVAL;
9dbd1aa3 2106 } else if (rs_is_recovering(rs)) {
33e53f06
HM
2107 DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)",
2108 (unsigned long long) mddev->recovery_cp);
2109 return -EINVAL;
9dbd1aa3
HM
2110 } else if (rs_is_reshaping(rs)) {
2111 DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)",
2112 (unsigned long long) mddev->reshape_position);
33e53f06
HM
2113 return -EINVAL;
2114 }
b12d437b
JB
2115 }
2116
2117 /*
2118 * Now we set the Faulty bit for those devices that are
2119 * recorded in the superblock as failed.
2120 */
33e53f06 2121 sb_retrieve_failed_devices(sb, failed_devices);
dafb20fa 2122 rdev_for_each(r, mddev) {
b12d437b
JB
2123 if (!r->sb_page)
2124 continue;
2125 sb2 = page_address(r->sb_page);
2126 sb2->failed_devices = 0;
33e53f06 2127 memset(sb2->extended_failed_devices, 0, sizeof(sb2->extended_failed_devices));
b12d437b
JB
2128
2129 /*
2130 * Check for any device re-ordering.
2131 */
2132 if (!test_bit(FirstUse, &r->flags) && (r->raid_disk >= 0)) {
2133 role = le32_to_cpu(sb2->array_position);
33e53f06
HM
2134 if (role < 0)
2135 continue;
2136
b12d437b 2137 if (role != r->raid_disk) {
e6ca5e1a
MS
2138 if (__is_raid10_near(mddev->layout)) {
2139 if (mddev->raid_disks % __raid10_near_copies(mddev->layout) ||
bd83a4c4
MS
2140 rs->raid_disks % rs->raid10_copies) {
2141 rs->ti->error =
2142 "Cannot change raid10 near set to odd # of devices!";
2143 return -EINVAL;
2144 }
33e53f06
HM
2145
2146 sb2->array_position = cpu_to_le32(r->raid_disk);
2147
2148 } else if (!(rs_is_raid10(rs) && rt_is_raid0(rs->raid_type)) &&
bd83a4c4
MS
2149 !(rs_is_raid0(rs) && rt_is_raid10(rs->raid_type)) &&
2150 !rt_is_raid1(rs->raid_type)) {
2151 rs->ti->error = "Cannot change device positions in raid set";
2152 return -EINVAL;
2153 }
33e53f06 2154
bd83a4c4 2155 DMINFO("raid device #%d now at position #%d", role, r->raid_disk);
b12d437b
JB
2156 }
2157
2158 /*
2159 * Partial recovery is performed on
2160 * returning failed devices.
2161 */
33e53f06 2162 if (test_bit(role, (void *) failed_devices))
b12d437b
JB
2163 set_bit(Faulty, &r->flags);
2164 }
2165 }
2166
2167 return 0;
2168}
2169
0cf45031 2170static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
b12d437b 2171{
0cf45031 2172 struct mddev *mddev = &rs->md;
33e53f06
HM
2173 struct dm_raid_superblock *sb;
2174
3a1c1ef2 2175 if (rs_is_raid0(rs) || !rdev->sb_page)
33e53f06
HM
2176 return 0;
2177
2178 sb = page_address(rdev->sb_page);
b12d437b
JB
2179
2180 /*
2181 * If mddev->events is not set, we know we have not yet initialized
2182 * the array.
2183 */
33e53f06 2184 if (!mddev->events && super_init_validation(rs, rdev))
b12d437b
JB
2185 return -EINVAL;
2186
9b6e5423
MS
2187 if (le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) {
2188 rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags";
2189 return -EINVAL;
2190 }
2191
2192 if (sb->incompat_features) {
ecbfb9f1 2193 rs->ti->error = "Unable to assemble array: No incompatible feature flags supported yet";
4c9971ca
HM
2194 return -EINVAL;
2195 }
2196
0cf45031 2197 /* Enable bitmap creation for RAID levels != 0 */
676fa5ad 2198 mddev->bitmap_info.offset = rt_is_raid0(rs->raid_type) ? 0 : to_sector(4096);
0cf45031
HM
2199 rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
2200
33e53f06
HM
2201 if (!test_and_clear_bit(FirstUse, &rdev->flags)) {
2202 /* Retrieve device size stored in superblock to be prepared for shrink */
2203 rdev->sectors = le64_to_cpu(sb->sectors);
b12d437b 2204 rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
33e53f06
HM
2205 if (rdev->recovery_offset == MaxSector)
2206 set_bit(In_sync, &rdev->flags);
2207 /*
2208 * If no reshape in progress -> we're recovering single
2209 * disk(s) and have to set the device(s) to out-of-sync
2210 */
9dbd1aa3 2211 else if (!rs_is_reshaping(rs))
33e53f06 2212 clear_bit(In_sync, &rdev->flags); /* Mandatory for recovery */
b12d437b
JB
2213 }
2214
2215 /*
2216 * If a device comes back, set it as not In_sync and no longer faulty.
2217 */
33e53f06
HM
2218 if (test_and_clear_bit(Faulty, &rdev->flags)) {
2219 rdev->recovery_offset = 0;
b12d437b
JB
2220 clear_bit(In_sync, &rdev->flags);
2221 rdev->saved_raid_disk = rdev->raid_disk;
b12d437b
JB
2222 }
2223
33e53f06
HM
2224 /* Reshape support -> restore repective data offsets */
2225 rdev->data_offset = le64_to_cpu(sb->data_offset);
2226 rdev->new_data_offset = le64_to_cpu(sb->new_data_offset);
b12d437b
JB
2227
2228 return 0;
2229}
2230
2231/*
2232 * Analyse superblocks and select the freshest.
2233 */
2234static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
2235{
73c6f239 2236 int r;
0447568f 2237 struct raid_dev *dev;
a9ad8526 2238 struct md_rdev *rdev, *tmp, *freshest;
fd01b88c 2239 struct mddev *mddev = &rs->md;
b12d437b
JB
2240
2241 freshest = NULL;
a9ad8526 2242 rdev_for_each_safe(rdev, tmp, mddev) {
761becff 2243 /*
c76d53f4 2244 * Skipping super_load due to CTR_FLAG_SYNC will cause
761becff 2245 * the array to undergo initialization again as
43157840 2246 * though it were new. This is the intended effect
761becff
JB
2247 * of the "sync" directive.
2248 *
2249 * When reshaping capability is added, we must ensure
2250 * that the "sync" directive is disallowed during the
2251 * reshape.
2252 */
4286325b 2253 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
761becff
JB
2254 continue;
2255
b12d437b
JB
2256 if (!rdev->meta_bdev)
2257 continue;
2258
73c6f239 2259 r = super_load(rdev, freshest);
b12d437b 2260
73c6f239 2261 switch (r) {
b12d437b
JB
2262 case 1:
2263 freshest = rdev;
2264 break;
2265 case 0:
2266 break;
2267 default:
0447568f 2268 dev = container_of(rdev, struct raid_dev, rdev);
55ebbb59
JB
2269 if (dev->meta_dev)
2270 dm_put_device(ti, dev->meta_dev);
0447568f 2271
55ebbb59
JB
2272 dev->meta_dev = NULL;
2273 rdev->meta_bdev = NULL;
0447568f 2274
55ebbb59
JB
2275 if (rdev->sb_page)
2276 put_page(rdev->sb_page);
0447568f 2277
55ebbb59 2278 rdev->sb_page = NULL;
0447568f 2279
55ebbb59 2280 rdev->sb_loaded = 0;
0447568f 2281
55ebbb59
JB
2282 /*
2283 * We might be able to salvage the data device
2284 * even though the meta device has failed. For
2285 * now, we behave as though '- -' had been
2286 * set for this device in the table.
2287 */
2288 if (dev->data_dev)
2289 dm_put_device(ti, dev->data_dev);
0447568f 2290
55ebbb59
JB
2291 dev->data_dev = NULL;
2292 rdev->bdev = NULL;
0447568f 2293
55ebbb59 2294 list_del(&rdev->same_set);
b12d437b
JB
2295 }
2296 }
2297
2298 if (!freshest)
2299 return 0;
2300
bd83a4c4
MS
2301 if (validate_raid_redundancy(rs)) {
2302 rs->ti->error = "Insufficient redundancy to activate array";
2303 return -EINVAL;
2304 }
55ebbb59 2305
b12d437b
JB
2306 /*
2307 * Validation of the freshest device provides the source of
2308 * validation for the remaining devices.
2309 */
9dbd1aa3
HM
2310 rs->ti->error = "Unable to assemble array: Invalid superblocks";
2311 if (super_validate(rs, freshest))
bd83a4c4 2312 return -EINVAL;
b12d437b 2313
dafb20fa 2314 rdev_for_each(rdev, mddev)
0cf45031 2315 if ((rdev != freshest) && super_validate(rs, rdev))
b12d437b 2316 return -EINVAL;
b12d437b
JB
2317 return 0;
2318}
2319
40ba37e5
HM
2320/*
2321 * Adjust data_offset and new_data_offset on all disk members of @rs
2322 * for out of place reshaping if requested by contructor
2323 *
2324 * We need free space at the beginning of each raid disk for forward
2325 * and at the end for backward reshapes which userspace has to provide
2326 * via remapping/reordering of space.
2327 */
2328static int rs_adjust_data_offsets(struct raid_set *rs)
2329{
2330 sector_t data_offset = 0, new_data_offset = 0;
2331 struct md_rdev *rdev;
2332
2333 /* Constructor did not request data offset change */
2334 if (!test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags)) {
2335 if (!rs_is_reshapable(rs))
2336 goto out;
2337
2338 return 0;
2339 }
2340
2341 /* HM FIXME: get InSync raid_dev? */
2342 rdev = &rs->dev[0].rdev;
2343
2344 if (rs->delta_disks < 0) {
2345 /*
2346 * Removing disks (reshaping backwards):
2347 *
2348 * - before reshape: data is at offset 0 and free space
2349 * is at end of each component LV
2350 *
2351 * - after reshape: data is at offset rs->data_offset != 0 on each component LV
2352 */
2353 data_offset = 0;
2354 new_data_offset = rs->data_offset;
2355
2356 } else if (rs->delta_disks > 0) {
2357 /*
2358 * Adding disks (reshaping forwards):
2359 *
2360 * - before reshape: data is at offset rs->data_offset != 0 and
2361 * free space is at begin of each component LV
2362 *
2363 * - after reshape: data is at offset 0 on each component LV
2364 */
2365 data_offset = rs->data_offset;
2366 new_data_offset = 0;
2367
2368 } else {
2369 /*
2370 * User space passes in 0 for data offset after having removed reshape space
2371 *
2372 * - or - (data offset != 0)
2373 *
2374 * Changing RAID layout or chunk size -> toggle offsets
2375 *
2376 * - before reshape: data is at offset rs->data_offset 0 and
2377 * free space is at end of each component LV
2378 * -or-
2379 * data is at offset rs->data_offset != 0 and
2380 * free space is at begin of each component LV
2381 *
2382 * - after reshape: data is at offset 0 if i was at offset != 0
2383 * of at offset != 0 if it was at offset 0
2384 * on each component LV
2385 *
2386 */
2387 data_offset = rs->data_offset ? rdev->data_offset : 0;
2388 new_data_offset = data_offset ? 0 : rs->data_offset;
2389 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2390 }
2391
2392 /*
2393 * Make sure we got a minimum amount of free sectors per device
2394 */
2395 if (rs->data_offset &&
2396 to_sector(i_size_read(rdev->bdev->bd_inode)) - rdev->sectors < MIN_FREE_RESHAPE_SPACE) {
2397 rs->ti->error = data_offset ? "No space for forward reshape" :
2398 "No space for backward reshape";
2399 return -ENOSPC;
2400 }
2401out:
2402 /* Adjust data offsets on all rdevs */
2403 rdev_for_each(rdev, &rs->md) {
2404 rdev->data_offset = data_offset;
2405 rdev->new_data_offset = new_data_offset;
2406 }
2407
2408 return 0;
2409}
2410
ecbfb9f1 2411/* Userpace reordered disks -> adjust raid_disk indexes in @rs */
e6ca5e1a 2412static void __reorder_raid_disk_indexes(struct raid_set *rs)
ecbfb9f1
HM
2413{
2414 int i = 0;
2415 struct md_rdev *rdev;
2416
2417 rdev_for_each(rdev, &rs->md) {
2418 rdev->raid_disk = i++;
2419 rdev->saved_raid_disk = rdev->new_raid_disk = -1;
2420 }
2421}
2422
2423/*
2424 * Setup @rs for takeover by a different raid level
2425 */
2426static int rs_setup_takeover(struct raid_set *rs)
2427{
2428 struct mddev *mddev = &rs->md;
2429 struct md_rdev *rdev;
2430 unsigned int d = mddev->raid_disks = rs->raid_disks;
2431 sector_t new_data_offset = rs->dev[0].rdev.data_offset ? 0 : rs->data_offset;
2432
2433 if (rt_is_raid10(rs->raid_type)) {
2434 if (mddev->level == 0) {
2435 /* Userpace reordered disks -> adjust raid_disk indexes */
e6ca5e1a 2436 __reorder_raid_disk_indexes(rs);
ecbfb9f1
HM
2437
2438 /* raid0 -> raid10_far layout */
2439 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_FAR,
2440 rs->raid10_copies);
2441 } else if (mddev->level == 1)
2442 /* raid1 -> raid10_near layout */
2443 mddev->layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2444 rs->raid_disks);
2445 else
2446 return -EINVAL;
2447
2448 }
2449
2450 clear_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2451 mddev->recovery_cp = MaxSector;
2452
2453 while (d--) {
2454 rdev = &rs->dev[d].rdev;
2455
2456 if (test_bit(d, (void *) rs->rebuild_disks)) {
2457 clear_bit(In_sync, &rdev->flags);
2458 clear_bit(Faulty, &rdev->flags);
2459 mddev->recovery_cp = rdev->recovery_offset = 0;
2460 /* Bitmap has to be created when we do an "up" takeover */
2461 set_bit(MD_ARRAY_FIRST_USE, &mddev->flags);
2462 }
2463
2464 rdev->new_data_offset = new_data_offset;
2465 }
2466
ecbfb9f1
HM
2467 return 0;
2468}
2469
9dbd1aa3
HM
2470/*
2471 *
2472 * - change raid layout
2473 * - change chunk size
2474 * - add disks
2475 * - remove disks
2476 */
2477static int rs_setup_reshape(struct raid_set *rs)
2478{
2479 int r = 0;
2480 unsigned int cur_raid_devs, d;
2481 struct mddev *mddev = &rs->md;
2482 struct md_rdev *rdev;
2483
2484 mddev->delta_disks = rs->delta_disks;
2485 cur_raid_devs = mddev->raid_disks;
2486
2487 /* Ignore impossible layout change whilst adding/removing disks */
2488 if (mddev->delta_disks &&
2489 mddev->layout != mddev->new_layout) {
2490 DMINFO("Ignoring invalid layout change with delta_disks=%d", rs->delta_disks);
2491 mddev->new_layout = mddev->layout;
2492 }
2493
2494 /*
2495 * Adjust array size:
2496 *
2497 * - in case of adding disks, array size has
2498 * to grow after the disk adding reshape,
2499 * which'll hapen in the event handler;
2500 * reshape will happen forward, so space has to
2501 * be available at the beginning of each disk
2502 *
2503 * - in case of removing disks, array size
2504 * has to shrink before starting the reshape,
2505 * which'll happen here;
2506 * reshape will happen backward, so space has to
2507 * be available at the end of each disk
2508 *
2509 * - data_offset and new_data_offset are
ae3c6cff 2510 * adjusted for aforementioned out of place
9dbd1aa3
HM
2511 * reshaping based on userspace passing in
2512 * the "data_offset <sectors>" key/value
ae3c6cff 2513 * pair via the constructor
9dbd1aa3
HM
2514 */
2515
2516 /* Add disk(s) */
2517 if (rs->delta_disks > 0) {
2518 /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */
2519 for (d = cur_raid_devs; d < rs->raid_disks; d++) {
2520 rdev = &rs->dev[d].rdev;
2521 clear_bit(In_sync, &rdev->flags);
2522
2523 /*
2524 * save_raid_disk needs to be -1, or recovery_offset will be set to 0
2525 * by md, which'll store that erroneously in the superblock on reshape
2526 */
2527 rdev->saved_raid_disk = -1;
2528 rdev->raid_disk = d;
2529
2530 rdev->sectors = mddev->dev_sectors;
2531 rdev->recovery_offset = MaxSector;
2532 }
2533
2534 mddev->reshape_backwards = 0; /* adding disks -> forward reshape */
2535
2536 /* Remove disk(s) */
2537 } else if (rs->delta_disks < 0) {
2538 r = rs_set_dev_and_array_sectors(rs, true);
2539 mddev->reshape_backwards = 1; /* removing disk(s) -> backward reshape */
2540
2541 /* Change layout and/or chunk size */
2542 } else {
2543 /*
2544 * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size:
2545 *
2546 * keeping number of disks and do layout change ->
2547 *
2548 * toggle reshape_backward depending on data_offset:
2549 *
2550 * - free space upfront -> reshape forward
2551 *
2552 * - free space at the end -> reshape backward
2553 *
2554 *
2555 * This utilizes free reshape space avoiding the need
2556 * for userspace to move (parts of) LV segments in
2557 * case of layout/chunksize change (for disk
2558 * adding/removing reshape space has to be at
2559 * the proper address (see above with delta_disks):
2560 *
2561 * add disk(s) -> begin
2562 * remove disk(s)-> end
2563 */
2564 mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1;
2565 }
2566
2567 return r;
2568}
2569
75b8e04b 2570/*
48cf06bc
HM
2571 * Enable/disable discard support on RAID set depending on
2572 * RAID level and discard properties of underlying RAID members.
75b8e04b 2573 */
ecbfb9f1 2574static void configure_discard_support(struct raid_set *rs)
75b8e04b 2575{
48cf06bc
HM
2576 int i;
2577 bool raid456;
ecbfb9f1 2578 struct dm_target *ti = rs->ti;
48cf06bc 2579
75b8e04b
HM
2580 /* Assume discards not supported until after checks below. */
2581 ti->discards_supported = false;
2582
2583 /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */
48cf06bc 2584 raid456 = (rs->md.level == 4 || rs->md.level == 5 || rs->md.level == 6);
75b8e04b 2585
48cf06bc 2586 for (i = 0; i < rs->md.raid_disks; i++) {
d20c4b08 2587 struct request_queue *q;
48cf06bc 2588
d20c4b08
HM
2589 if (!rs->dev[i].rdev.bdev)
2590 continue;
2591
2592 q = bdev_get_queue(rs->dev[i].rdev.bdev);
48cf06bc
HM
2593 if (!q || !blk_queue_discard(q))
2594 return;
2595
2596 if (raid456) {
2597 if (!q->limits.discard_zeroes_data)
2598 return;
2599 if (!devices_handle_discard_safely) {
2600 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
2601 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
2602 return;
2603 }
2604 }
2605 }
2606
2607 /* All RAID members properly support discards */
75b8e04b
HM
2608 ti->discards_supported = true;
2609
2610 /*
2611 * RAID1 and RAID10 personalities require bio splitting,
48cf06bc 2612 * RAID0/4/5/6 don't and process large discard bios properly.
75b8e04b 2613 */
48cf06bc 2614 ti->split_discard_bios = !!(rs->md.level == 1 || rs->md.level == 10);
75b8e04b
HM
2615 ti->num_discard_bios = 1;
2616}
2617
9d09e663 2618/*
73c6f239 2619 * Construct a RAID0/1/10/4/5/6 mapping:
9d09e663 2620 * Args:
43157840
MS
2621 * <raid_type> <#raid_params> <raid_params>{0,} \
2622 * <#raid_devs> [<meta_dev1> <dev1>]{1,}
9d09e663 2623 *
43157840 2624 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
9d09e663 2625 * details on possible <raid_params>.
73c6f239
HM
2626 *
2627 * Userspace is free to initialize the metadata devices, hence the superblocks to
2628 * enforce recreation based on the passed in table parameters.
2629 *
9d09e663
N
2630 */
2631static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
2632{
73c6f239 2633 int r;
9d09e663 2634 struct raid_type *rt;
92c83d79 2635 unsigned num_raid_params, num_raid_devs;
9d09e663 2636 struct raid_set *rs = NULL;
92c83d79 2637 const char *arg;
9dbd1aa3 2638 struct rs_layout rs_layout;
92c83d79
HM
2639 struct dm_arg_set as = { argc, argv }, as_nrd;
2640 struct dm_arg _args[] = {
2641 { 0, as.argc, "Cannot understand number of raid parameters" },
2642 { 1, 254, "Cannot understand number of raid devices parameters" }
2643 };
2644
2645 /* Must have <raid_type> */
2646 arg = dm_shift_arg(&as);
bd83a4c4
MS
2647 if (!arg) {
2648 ti->error = "No arguments";
2649 return -EINVAL;
2650 }
9d09e663 2651
92c83d79 2652 rt = get_raid_type(arg);
bd83a4c4
MS
2653 if (!rt) {
2654 ti->error = "Unrecognised raid_type";
2655 return -EINVAL;
2656 }
9d09e663 2657
92c83d79
HM
2658 /* Must have <#raid_params> */
2659 if (dm_read_arg_group(_args, &as, &num_raid_params, &ti->error))
43157840 2660 return -EINVAL;
9d09e663 2661
92c83d79
HM
2662 /* number of raid device tupples <meta_dev data_dev> */
2663 as_nrd = as;
2664 dm_consume_args(&as_nrd, num_raid_params);
2665 _args[1].max = (as_nrd.argc - 1) / 2;
2666 if (dm_read_arg(_args + 1, &as_nrd, &num_raid_devs, &ti->error))
43157840 2667 return -EINVAL;
9d09e663 2668
bb91a63f 2669 if (!__within_range(num_raid_devs, 1, MAX_RAID_DEVICES)) {
bd83a4c4
MS
2670 ti->error = "Invalid number of supplied raid devices";
2671 return -EINVAL;
2672 }
3ca5a21a 2673
bfcee0e3 2674 rs = raid_set_alloc(ti, rt, num_raid_devs);
9d09e663
N
2675 if (IS_ERR(rs))
2676 return PTR_ERR(rs);
2677
92c83d79 2678 r = parse_raid_params(rs, &as, num_raid_params);
73c6f239 2679 if (r)
9d09e663
N
2680 goto bad;
2681
702108d1 2682 r = parse_dev_params(rs, &as);
73c6f239 2683 if (r)
9d09e663
N
2684 goto bad;
2685
b12d437b 2686 rs->md.sync_super = super_sync;
ecbfb9f1 2687
40ba37e5
HM
2688 r = rs_set_dev_and_array_sectors(rs, false);
2689 if (r)
2690 return r;
2691
ecbfb9f1
HM
2692 /*
2693 * Backup any new raid set level, layout, ...
2694 * requested to be able to compare to superblock
2695 * members for conversion decisions.
2696 */
9dbd1aa3 2697 rs_config_backup(rs, &rs_layout);
ecbfb9f1 2698
73c6f239
HM
2699 r = analyse_superblocks(ti, rs);
2700 if (r)
b12d437b
JB
2701 goto bad;
2702
9d09e663 2703 INIT_WORK(&rs->md.event_work, do_table_event);
9d09e663 2704 ti->private = rs;
55a62eef 2705 ti->num_flush_bios = 1;
9d09e663 2706
ecbfb9f1 2707 /* Restore any requested new layout for conversion decision */
9dbd1aa3 2708 rs_config_restore(rs, &rs_layout);
ecbfb9f1 2709
9dbd1aa3
HM
2710 if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) {
2711 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2712 rs_set_new(rs);
2713 } else if (rs_is_reshaping(rs))
2714 ; /* skip rs setup */
2715 else if (rs_takeover_requested(rs)) {
2716 if (rs_is_reshaping(rs)) {
2717 ti->error = "Can't takeover a reshaping raid set";
2718 return -EPERM;
2719 }
2720
2721 /*
2722 * If a takeover is needed, just set the level to
2723 * the new requested one and allow the raid set to run.
2724 */
ecbfb9f1
HM
2725 r = rs_check_takeover(rs);
2726 if (r)
2727 return r;
2728
2729 r = rs_setup_takeover(rs);
2730 if (r)
2731 return r;
2732
4286325b 2733 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
6e20902e 2734 set_bit(RT_FLAG_KEEP_RS_FROZEN, &rs->runtime_flags);
3a1c1ef2 2735 rs_set_new(rs);
40ba37e5 2736 } else if (rs_reshape_requested(rs)) {
9dbd1aa3
HM
2737 if (rs_is_reshaping(rs)) {
2738 ti->error = "raid set already reshaping!";
2739 return -EPERM;
2740 }
2741
2742 if (rs_is_raid10(rs)) {
2743 if (rs->raid_disks != rs->md.raid_disks &&
2744 __is_raid10_near(rs->md.layout) &&
2745 rs->raid10_copies &&
2746 rs->raid10_copies != __raid10_near_copies(rs->md.layout)) {
2747 /*
2748 * raid disk have to be multiple of data copies to allow this conversion,
2749 *
2750 * This is actually not a reshape it is a
2751 * rebuild of any additional mirrors per group
2752 */
2753 if (rs->raid_disks % rs->raid10_copies) {
2754 ti->error = "Can't reshape raid10 mirror groups";
2755 return -EINVAL;
2756 }
2757
2758 /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */
2759 __reorder_raid_disk_indexes(rs);
2760 rs->md.layout = raid10_format_to_md_layout(rs, ALGORITHM_RAID10_NEAR,
2761 rs->raid10_copies);
2762 rs->md.new_layout = rs->md.layout;
2763
2764 } else
2765 set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags);
2766
2767 } else if (rs_is_raid456(rs))
2768 set_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags);
2769
2770 /*
2771 * HM FIXME: process raid1 via delta_disks as well?
2772 * Would cause allocations in raid1->check_reshape
2773 * though, thus more issues with potential failures
2774 */
6e20902e
HM
2775 else if (rs_is_raid1(rs)) {
2776 set_bit(RT_FLAG_KEEP_RS_FROZEN, &rs->runtime_flags);
9dbd1aa3 2777 rs->md.raid_disks = rs->raid_disks;
6e20902e
HM
2778 }
2779
2780 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
2781 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
2782 set_bit(RT_FLAG_KEEP_RS_FROZEN, &rs->runtime_flags);
2783 }
9dbd1aa3
HM
2784
2785 if (rs->md.raid_disks < rs->raid_disks)
2786 set_bit(MD_ARRAY_FIRST_USE, &rs->md.flags);
2787
9dbd1aa3 2788 rs_set_cur(rs);
3a1c1ef2
HM
2789 } else
2790 rs_set_cur(rs);
ecbfb9f1 2791
40ba37e5
HM
2792 /* If constructor requested it, change data and new_data offsets */
2793 r = rs_adjust_data_offsets(rs);
2794 if (r)
2795 return r;
2796
ecbfb9f1
HM
2797 /* Start raid set read-only and assumed clean to change in raid_resume() */
2798 rs->md.ro = 1;
2799 rs->md.in_sync = 1;
2800 set_bit(MD_RECOVERY_FROZEN, &rs->md.recovery);
75b8e04b 2801
0cf45031
HM
2802 /* Has to be held on running the array */
2803 mddev_lock_nointr(&rs->md);
73c6f239 2804 r = md_run(&rs->md);
9d09e663 2805 rs->md.in_sync = 0; /* Assume already marked dirty */
9d09e663 2806
73c6f239 2807 if (r) {
9dbd1aa3
HM
2808 ti->error = "Failed to run raid array";
2809 mddev_unlock(&rs->md);
9d09e663
N
2810 goto bad;
2811 }
2812
2813 rs->callbacks.congested_fn = raid_is_congested;
9d09e663
N
2814 dm_table_add_target_callbacks(ti->table, &rs->callbacks);
2815
32737279 2816 mddev_suspend(&rs->md);
9dbd1aa3
HM
2817
2818 /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
2819 if (rs_is_raid456(rs)) {
2820 r = rs_set_raid456_stripe_cache(rs);
2821 if (r)
2822 goto bad_stripe_cache;
2823 }
2824
2825 /* Now do an early reshape check */
2826 if (test_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
2827 r = rs_check_reshape(rs);
2828 if (r)
2829 return r;
2830
2831 /* Restore new, ctr requested layout to perform check */
2832 rs_config_restore(rs, &rs_layout);
2833
2834 r = rs->md.pers->check_reshape(&rs->md);
2835 if (r) {
2836 ti->error = "Reshape check failed";
2837 goto bad_check_reshape;
2838 }
2839 }
2840
2841 mddev_unlock(&rs->md);
9d09e663
N
2842 return 0;
2843
9dbd1aa3
HM
2844bad_stripe_cache:
2845bad_check_reshape:
63f33b8d 2846 md_stop(&rs->md);
9d09e663 2847bad:
bfcee0e3 2848 raid_set_free(rs);
9d09e663 2849
73c6f239 2850 return r;
9d09e663
N
2851}
2852
2853static void raid_dtr(struct dm_target *ti)
2854{
2855 struct raid_set *rs = ti->private;
2856
2857 list_del_init(&rs->callbacks.list);
2858 md_stop(&rs->md);
bfcee0e3 2859 raid_set_free(rs);
9d09e663
N
2860}
2861
7de3ee57 2862static int raid_map(struct dm_target *ti, struct bio *bio)
9d09e663
N
2863{
2864 struct raid_set *rs = ti->private;
fd01b88c 2865 struct mddev *mddev = &rs->md;
9d09e663 2866
9dbd1aa3
HM
2867 /*
2868 * If we're reshaping to add disk(s)), ti->len and
2869 * mddev->array_sectors will differ during the process
2870 * (ti->len > mddev->array_sectors), so we have to requeue
2871 * bios with addresses > mddev->array_sectors here or
2872 * or there will occur accesses past EOD of the component
2873 * data images thus erroring the raid set.
2874 */
2875 if (unlikely(bio_end_sector(bio) > mddev->array_sectors))
2876 return DM_MAPIO_REQUEUE;
2877
9d09e663
N
2878 mddev->pers->make_request(mddev, bio);
2879
2880 return DM_MAPIO_SUBMITTED;
2881}
2882
3a1c1ef2 2883/* Return string describing the current sync action of @mddev */
be83651f
JB
2884static const char *decipher_sync_action(struct mddev *mddev)
2885{
2886 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
2887 return "frozen";
2888
2889 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2890 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2891 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2892 return "reshape";
2893
2894 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2895 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2896 return "resync";
2897 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2898 return "check";
2899 return "repair";
2900 }
2901
2902 if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
2903 return "recover";
2904 }
2905
2906 return "idle";
2907}
2908
3a1c1ef2
HM
2909/*
2910 * Return status string @rdev
2911 *
2912 * Status characters:
2913 *
2914 * 'D' = Dead/Failed device
2915 * 'a' = Alive but not in-sync
2916 * 'A' = Alive and in-sync
2917 */
e6ca5e1a 2918static const char *__raid_dev_status(struct md_rdev *rdev, bool array_in_sync)
9d09e663 2919{
3a1c1ef2
HM
2920 if (test_bit(Faulty, &rdev->flags))
2921 return "D";
2922 else if (!array_in_sync || !test_bit(In_sync, &rdev->flags))
2923 return "a";
2924 else
2925 return "A";
2926}
9d09e663 2927
3a1c1ef2
HM
2928/* Helper to return resync/reshape progress for @rs and @array_in_sync */
2929static sector_t rs_get_progress(struct raid_set *rs,
2930 sector_t resync_max_sectors, bool *array_in_sync)
2931{
2932 sector_t r, recovery_cp, curr_resync_completed;
2933 struct mddev *mddev = &rs->md;
9d09e663 2934
3a1c1ef2
HM
2935 curr_resync_completed = mddev->curr_resync_completed ?: mddev->recovery_cp;
2936 recovery_cp = mddev->recovery_cp;
2937 *array_in_sync = false;
2938
2939 if (rs_is_raid0(rs)) {
2940 r = resync_max_sectors;
2941 *array_in_sync = true;
2942
2943 } else {
2944 r = mddev->reshape_position;
2945
2946 /* Reshape is relative to the array size */
2947 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) ||
2948 r != MaxSector) {
2949 if (r == MaxSector) {
2950 *array_in_sync = true;
2951 r = resync_max_sectors;
0cf45031 2952 } else {
3a1c1ef2
HM
2953 /* Got to reverse on backward reshape */
2954 if (mddev->reshape_backwards)
2955 r = mddev->array_sectors - r;
2956
2957 /* Devide by # of data stripes */
2958 sector_div(r, mddev_data_stripes(rs));
0cf45031 2959 }
3a1c1ef2
HM
2960
2961 /* Sync is relative to the component device size */
2962 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2963 r = curr_resync_completed;
2964 else
2965 r = recovery_cp;
2966
2967 if (r == MaxSector) {
2968 /*
2969 * Sync complete.
2970 */
2971 *array_in_sync = true;
2972 r = resync_max_sectors;
2973 } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
2974 /*
2975 * If "check" or "repair" is occurring, the raid set has
2976 * undergone an initial sync and the health characters
2977 * should not be 'a' anymore.
2978 */
2979 *array_in_sync = true;
0cf45031 2980 } else {
3a1c1ef2 2981 struct md_rdev *rdev;
be83651f 2982
3a1c1ef2
HM
2983 /*
2984 * The raid set may be doing an initial sync, or it may
43157840 2985 * be rebuilding individual components. If all the
3a1c1ef2
HM
2986 * devices are In_sync, then it is the raid set that is
2987 * being initialized.
2988 */
2989 rdev_for_each(rdev, mddev)
2990 if (!test_bit(In_sync, &rdev->flags))
2991 *array_in_sync = true;
2992#if 0
2993 r = 0; /* HM FIXME: TESTME: https://bugzilla.redhat.com/show_bug.cgi?id=1210637 ? */
2994#endif
2e727c3c 2995 }
3a1c1ef2
HM
2996 }
2997
2998 return r;
2999}
3000
3001/* Helper to return @dev name or "-" if !@dev */
e6ca5e1a 3002static const char *__get_dev_name(struct dm_dev *dev)
3a1c1ef2
HM
3003{
3004 return dev ? dev->name : "-";
3005}
3006
3007static void raid_status(struct dm_target *ti, status_type_t type,
3008 unsigned int status_flags, char *result, unsigned int maxlen)
3009{
3010 struct raid_set *rs = ti->private;
3011 struct mddev *mddev = &rs->md;
3012 struct r5conf *conf = mddev->private;
3013 int max_nr_stripes = conf ? conf->max_nr_stripes : 0;
3014 bool array_in_sync;
3015 unsigned int raid_param_cnt = 1; /* at least 1 for chunksize */
3016 unsigned int sz = 0;
3017 unsigned int write_mostly_params = 0;
3018 sector_t progress, resync_max_sectors, resync_mismatches;
3019 const char *sync_action;
3020 struct raid_type *rt;
3021 struct md_rdev *rdev;
3022
3023 switch (type) {
3024 case STATUSTYPE_INFO:
3025 /* *Should* always succeed */
3026 rt = get_raid_type_by_ll(mddev->new_level, mddev->new_layout);
3027 if (!rt)
3028 return;
3029
9dbd1aa3 3030 DMEMIT("%s %d ", rt->name, mddev->raid_disks);
3a1c1ef2
HM
3031
3032 /* Access most recent mddev properties for status output */
3033 smp_rmb();
3034 /* Get sensible max sectors even if raid set not yet started */
4286325b 3035 resync_max_sectors = test_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags) ?
3a1c1ef2
HM
3036 mddev->resync_max_sectors : mddev->dev_sectors;
3037 progress = rs_get_progress(rs, resync_max_sectors, &array_in_sync);
3038 resync_mismatches = (mddev->last_sync_action && !strcasecmp(mddev->last_sync_action, "check")) ?
9dbd1aa3 3039 atomic64_read(&mddev->resync_mismatches) : 0;
3a1c1ef2
HM
3040 sync_action = decipher_sync_action(&rs->md);
3041
3042 /* HM FIXME: do we want another state char for raid0? It shows 'D' or 'A' now */
3043 rdev_for_each(rdev, mddev)
e6ca5e1a 3044 DMEMIT(__raid_dev_status(rdev, array_in_sync));
9d09e663 3045
2e727c3c 3046 /*
3a1c1ef2 3047 * In-sync/Reshape ratio:
2e727c3c 3048 * The in-sync ratio shows the progress of:
3a1c1ef2
HM
3049 * - Initializing the raid set
3050 * - Rebuilding a subset of devices of the raid set
2e727c3c
JB
3051 * The user can distinguish between the two by referring
3052 * to the status characters.
3a1c1ef2
HM
3053 *
3054 * The reshape ratio shows the progress of
3055 * changing the raid layout or the number of
3056 * disks of a raid set
2e727c3c 3057 */
3a1c1ef2
HM
3058 DMEMIT(" %llu/%llu", (unsigned long long) progress,
3059 (unsigned long long) resync_max_sectors);
9d09e663 3060
be83651f 3061 /*
3a1c1ef2
HM
3062 * v1.5.0+:
3063 *
be83651f 3064 * Sync action:
3a1c1ef2 3065 * See Documentation/device-mapper/dm-raid.txt for
be83651f
JB
3066 * information on each of these states.
3067 */
3a1c1ef2 3068 DMEMIT(" %s", sync_action);
be83651f
JB
3069
3070 /*
3a1c1ef2
HM
3071 * v1.5.0+:
3072 *
be83651f
JB
3073 * resync_mismatches/mismatch_cnt
3074 * This field shows the number of discrepancies found when
3a1c1ef2 3075 * performing a "check" of the raid set.
be83651f 3076 */
3a1c1ef2 3077 DMEMIT(" %llu", (unsigned long long) resync_mismatches);
9d09e663 3078
3a1c1ef2 3079 /*
9b6e5423 3080 * v1.9.0+:
3a1c1ef2
HM
3081 *
3082 * data_offset (needed for out of space reshaping)
3083 * This field shows the data offset into the data
3084 * image LV where the first stripes data starts.
3085 *
3086 * We keep data_offset equal on all raid disks of the set,
3087 * so retrieving it from the first raid disk is sufficient.
3088 */
3089 DMEMIT(" %llu", (unsigned long long) rs->dev[0].rdev.data_offset);
3090 break;
9d09e663 3091
3a1c1ef2
HM
3092 case STATUSTYPE_TABLE:
3093 /* Report the table line string you would use to construct this raid set */
3094
3095 /* Calculate raid parameter count */
3096 rdev_for_each(rdev, mddev)
3097 if (test_bit(WriteMostly, &rdev->flags))
3098 write_mostly_params += 2;
3099 raid_param_cnt += memweight(rs->rebuild_disks,
3100 DISKS_ARRAY_ELEMS * sizeof(*rs->rebuild_disks)) * 2 +
3101 write_mostly_params +
3102 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_NO_ARGS) +
3103 hweight32(rs->ctr_flags & CTR_FLAG_OPTIONS_ONE_ARG) * 2;
3104 /* Emit table line */
3105 DMEMIT("%s %u %u", rs->raid_type->name, raid_param_cnt, mddev->new_chunk_sectors);
4286325b 3106 if (test_bit(__CTR_FLAG_RAID10_FORMAT, &rs->ctr_flags))
3fa6cf38 3107 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT),
3a1c1ef2 3108 raid10_md_layout_to_format(mddev->layout));
4286325b 3109 if (test_bit(__CTR_FLAG_RAID10_COPIES, &rs->ctr_flags))
3fa6cf38 3110 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES),
3a1c1ef2 3111 raid10_md_layout_to_copies(mddev->layout));
4286325b 3112 if (test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags))
3fa6cf38 3113 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC));
4286325b 3114 if (test_bit(__CTR_FLAG_SYNC, &rs->ctr_flags))
3fa6cf38 3115 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC));
4286325b 3116 if (test_bit(__CTR_FLAG_REGION_SIZE, &rs->ctr_flags))
3fa6cf38 3117 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE),
3a1c1ef2 3118 (unsigned long long) to_sector(mddev->bitmap_info.chunksize));
4286325b 3119 if (test_bit(__CTR_FLAG_DATA_OFFSET, &rs->ctr_flags))
3fa6cf38 3120 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET),
3a1c1ef2 3121 (unsigned long long) rs->data_offset);
4286325b 3122 if (test_bit(__CTR_FLAG_DAEMON_SLEEP, &rs->ctr_flags))
3fa6cf38 3123 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP),
3a1c1ef2 3124 mddev->bitmap_info.daemon_sleep);
4286325b 3125 if (test_bit(__CTR_FLAG_DELTA_DISKS, &rs->ctr_flags))
3fa6cf38 3126 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS),
3a1c1ef2 3127 mddev->delta_disks);
4286325b 3128 if (test_bit(__CTR_FLAG_STRIPE_CACHE, &rs->ctr_flags))
3fa6cf38 3129 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE),
3a1c1ef2
HM
3130 max_nr_stripes);
3131 rdev_for_each(rdev, mddev)
3132 if (test_bit(rdev->raid_disk, (void *) rs->rebuild_disks))
3fa6cf38 3133 DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD),
3a1c1ef2
HM
3134 rdev->raid_disk);
3135 rdev_for_each(rdev, mddev)
3136 if (test_bit(WriteMostly, &rdev->flags))
3fa6cf38 3137 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY),
3a1c1ef2 3138 rdev->raid_disk);
4286325b 3139 if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND, &rs->ctr_flags))
3fa6cf38 3140 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND),
3a1c1ef2 3141 mddev->bitmap_info.max_write_behind);
4286325b 3142 if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE, &rs->ctr_flags))
3fa6cf38 3143 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE),
3a1c1ef2 3144 mddev->sync_speed_max);
4286325b 3145 if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE, &rs->ctr_flags))
3fa6cf38 3146 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE),
3a1c1ef2
HM
3147 mddev->sync_speed_min);
3148 DMEMIT(" %d", rs->raid_disks);
3149 rdev_for_each(rdev, mddev) {
3150 struct raid_dev *rd = container_of(rdev, struct raid_dev, rdev);
3151
e6ca5e1a
MS
3152 DMEMIT(" %s %s", __get_dev_name(rd->meta_dev),
3153 __get_dev_name(rd->data_dev));
9d09e663
N
3154 }
3155 }
9d09e663
N
3156}
3157
be83651f
JB
3158static int raid_message(struct dm_target *ti, unsigned argc, char **argv)
3159{
3160 struct raid_set *rs = ti->private;
3161 struct mddev *mddev = &rs->md;
3162
be83651f
JB
3163 if (!mddev->pers || !mddev->pers->sync_request)
3164 return -EINVAL;
3165
3166 if (!strcasecmp(argv[0], "frozen"))
3167 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3168 else
3169 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3170
3171 if (!strcasecmp(argv[0], "idle") || !strcasecmp(argv[0], "frozen")) {
3172 if (mddev->sync_thread) {
3173 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3174 md_reap_sync_thread(mddev);
3175 }
3176 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3177 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3178 return -EBUSY;
3179 else if (!strcasecmp(argv[0], "resync"))
3a1c1ef2
HM
3180 ; /* MD_RECOVERY_NEEDED set below */
3181 else if (!strcasecmp(argv[0], "recover"))
be83651f 3182 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3a1c1ef2 3183 else {
be83651f
JB
3184 if (!strcasecmp(argv[0], "check"))
3185 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3186 else if (!!strcasecmp(argv[0], "repair"))
3187 return -EINVAL;
3188 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3189 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3190 }
3191 if (mddev->ro == 2) {
3192 /* A write to sync_action is enough to justify
3193 * canceling read-auto mode
3194 */
3195 mddev->ro = 0;
3a1c1ef2 3196 if (!mddev->suspended && mddev->sync_thread)
be83651f
JB
3197 md_wakeup_thread(mddev->sync_thread);
3198 }
3199 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3a1c1ef2 3200 if (!mddev->suspended && mddev->thread)
be83651f
JB
3201 md_wakeup_thread(mddev->thread);
3202
3203 return 0;
3204}
3205
3206static int raid_iterate_devices(struct dm_target *ti,
3207 iterate_devices_callout_fn fn, void *data)
9d09e663
N
3208{
3209 struct raid_set *rs = ti->private;
3210 unsigned i;
73c6f239 3211 int r = 0;
9d09e663 3212
73c6f239 3213 for (i = 0; !r && i < rs->md.raid_disks; i++)
9d09e663 3214 if (rs->dev[i].data_dev)
73c6f239 3215 r = fn(ti,
9d09e663
N
3216 rs->dev[i].data_dev,
3217 0, /* No offset on data devs */
3218 rs->md.dev_sectors,
3219 data);
3220
73c6f239 3221 return r;
9d09e663
N
3222}
3223
3224static void raid_io_hints(struct dm_target *ti, struct queue_limits *limits)
3225{
3226 struct raid_set *rs = ti->private;
3227 unsigned chunk_size = rs->md.chunk_sectors << 9;
d1688a6d 3228 struct r5conf *conf = rs->md.private;
9d09e663
N
3229
3230 blk_limits_io_min(limits, chunk_size);
3231 blk_limits_io_opt(limits, chunk_size * (conf->raid_disks - conf->max_degraded));
3232}
3233
3234static void raid_presuspend(struct dm_target *ti)
3235{
3236 struct raid_set *rs = ti->private;
3237
3238 md_stop_writes(&rs->md);
3239}
3240
3241static void raid_postsuspend(struct dm_target *ti)
3242{
3243 struct raid_set *rs = ti->private;
3244
6e20902e
HM
3245 if (test_and_clear_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
3246 if (!rs->md.suspended)
3247 mddev_suspend(&rs->md);
3248 rs->md.ro = 1;
3249 }
9d09e663
N
3250}
3251
f381e71b 3252static void attempt_restore_of_faulty_devices(struct raid_set *rs)
9d09e663 3253{
9092c02d
JB
3254 int i;
3255 uint64_t failed_devices, cleared_failed_devices = 0;
3256 unsigned long flags;
3257 struct dm_raid_superblock *sb;
9092c02d 3258 struct md_rdev *r;
9d09e663 3259
f381e71b
JB
3260 for (i = 0; i < rs->md.raid_disks; i++) {
3261 r = &rs->dev[i].rdev;
3262 if (test_bit(Faulty, &r->flags) && r->sb_page &&
0a7b8188
HM
3263 sync_page_io(r, 0, r->sb_size, r->sb_page,
3264 REQ_OP_READ, 0, true)) {
f381e71b
JB
3265 DMINFO("Faulty %s device #%d has readable super block."
3266 " Attempting to revive it.",
3267 rs->raid_type->name, i);
a4dc163a
JB
3268
3269 /*
3270 * Faulty bit may be set, but sometimes the array can
3271 * be suspended before the personalities can respond
3272 * by removing the device from the array (i.e. calling
43157840 3273 * 'hot_remove_disk'). If they haven't yet removed
a4dc163a
JB
3274 * the failed device, its 'raid_disk' number will be
3275 * '>= 0' - meaning we must call this function
3276 * ourselves.
3277 */
3278 if ((r->raid_disk >= 0) &&
3279 (r->mddev->pers->hot_remove_disk(r->mddev, r) != 0))
3280 /* Failed to revive this device, try next */
3281 continue;
3282
f381e71b
JB
3283 r->raid_disk = i;
3284 r->saved_raid_disk = i;
3285 flags = r->flags;
3286 clear_bit(Faulty, &r->flags);
3287 clear_bit(WriteErrorSeen, &r->flags);
3288 clear_bit(In_sync, &r->flags);
3289 if (r->mddev->pers->hot_add_disk(r->mddev, r)) {
3290 r->raid_disk = -1;
3291 r->saved_raid_disk = -1;
3292 r->flags = flags;
3293 } else {
3294 r->recovery_offset = 0;
3295 cleared_failed_devices |= 1 << i;
3296 }
3297 }
3298 }
3299 if (cleared_failed_devices) {
3300 rdev_for_each(r, &rs->md) {
3301 sb = page_address(r->sb_page);
3302 failed_devices = le64_to_cpu(sb->failed_devices);
3303 failed_devices &= ~cleared_failed_devices;
3304 sb->failed_devices = cpu_to_le64(failed_devices);
3305 }
3306 }
3307}
3308
e6ca5e1a 3309static int __load_dirty_region_bitmap(struct raid_set *rs)
ecbfb9f1
HM
3310{
3311 int r = 0;
3312
3313 /* Try loading the bitmap unless "raid0", which does not have one */
3314 if (!rs_is_raid0(rs) &&
4286325b 3315 !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags)) {
ecbfb9f1
HM
3316 r = bitmap_load(&rs->md);
3317 if (r)
3318 DMERR("Failed to load bitmap");
3319 }
3320
3321 return r;
3322}
3323
6e20902e
HM
3324/* Enforce updating all superblocks */
3325static void rs_update_sbs(struct raid_set *rs)
3326{
3327 struct mddev *mddev = &rs->md;
3328 int ro = mddev->ro;
3329
3330 set_bit(MD_CHANGE_DEVS, &mddev->flags);
3331 mddev->ro = 0;
3332 md_update_sb(mddev, 1);
3333 mddev->ro = ro;
3334}
3335
9dbd1aa3
HM
3336/*
3337 * Reshape changes raid algorithm of @rs to new one within personality
3338 * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes
3339 * disks from a raid set thus growing/shrinking it or resizes the set
3340 *
3341 * Call mddev_lock_nointr() before!
3342 */
3343static int rs_start_reshape(struct raid_set *rs)
3344{
3345 int r;
3346 struct mddev *mddev = &rs->md;
3347 struct md_personality *pers = mddev->pers;
3348
3349 r = rs_setup_reshape(rs);
3350 if (r)
3351 return r;
3352
3353 /* Need to be resumed to be able to start reshape, recovery is frozen until raid_resume() though */
3354 if (mddev->suspended)
3355 mddev_resume(mddev);
3356
3357 /*
3358 * Check any reshape constraints enforced by the personalility
3359 *
3360 * May as well already kick the reshape off so that * pers->start_reshape() becomes optional.
3361 */
3362 r = pers->check_reshape(mddev);
3363 if (r) {
3364 rs->ti->error = "pers->check_reshape() failed";
3365 return r;
3366 }
3367
3368 /*
3369 * Personality may not provide start reshape method in which
3370 * case check_reshape above has already covered everything
3371 */
3372 if (pers->start_reshape) {
3373 r = pers->start_reshape(mddev);
3374 if (r) {
3375 rs->ti->error = "pers->start_reshape() failed";
3376 return r;
3377 }
3378 }
3379
3380 /* Suspend because a resume will happen in raid_resume() */
3381 if (!mddev->suspended)
3382 mddev_suspend(mddev);
3383
6e20902e
HM
3384 /*
3385 * Now reshape got set up, update superblocks to
3386 * reflect the fact so that a table reload will
3387 * access proper superblock content in the ctr.
3388 */
3389 rs_update_sbs(rs);
9dbd1aa3
HM
3390
3391 return 0;
3392}
3393
ecbfb9f1
HM
3394static int raid_preresume(struct dm_target *ti)
3395{
9dbd1aa3 3396 int r;
ecbfb9f1
HM
3397 struct raid_set *rs = ti->private;
3398 struct mddev *mddev = &rs->md;
3399
3400 /* This is a resume after a suspend of the set -> it's already started */
4286325b 3401 if (test_and_set_bit(RT_FLAG_RS_PRERESUMED, &rs->runtime_flags))
ecbfb9f1
HM
3402 return 0;
3403
3404 /*
3405 * The superblocks need to be updated on disk if the
6e20902e
HM
3406 * array is new or new devices got added (thus zeroed
3407 * out by userspace) or __load_dirty_region_bitmap
3408 * will overwrite them in core with old data or fail.
ecbfb9f1 3409 */
6e20902e
HM
3410 if (test_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags))
3411 rs_update_sbs(rs);
ecbfb9f1
HM
3412
3413 /*
3414 * Disable/enable discard support on raid set after any
3415 * conversion, because devices can have been added
3416 */
3417 configure_discard_support(rs);
3418
3419 /* Load the bitmap from disk unless raid0 */
9dbd1aa3
HM
3420 r = __load_dirty_region_bitmap(rs);
3421 if (r)
3422 return r;
3423
4257e085
HM
3424 /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) */
3425 if (test_bit(RT_FLAG_RS_BITMAP_LOADED, &rs->runtime_flags) &&
3426 mddev->bitmap_info.chunksize != to_bytes(rs->requested_bitmap_chunk_sectors)) {
3427 r = bitmap_resize(mddev->bitmap, mddev->dev_sectors,
3428 to_bytes(rs->requested_bitmap_chunk_sectors), 0);
3429 if (r)
3430 DMERR("Failed to resize bitmap");
3431 }
3432
9dbd1aa3
HM
3433 /* Check for any resize/reshape on @rs and adjust/initiate */
3434 /* Be prepared for mddev_resume() in raid_resume() */
3435 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3436 if (mddev->recovery_cp && mddev->recovery_cp < MaxSector) {
3437 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3438 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3439 mddev->resync_min = mddev->recovery_cp;
3440 }
3441
3442 rs_set_capacity(rs);
3443
3444 /* Check for any reshape request and region size change unless new raid set */
3445 if (test_and_clear_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
3446 /* Initiate a reshape. */
3447 mddev_lock_nointr(mddev);
3448 r = rs_start_reshape(rs);
3449 mddev_unlock(mddev);
3450 if (r)
3451 DMWARN("Failed to check/start reshape, continuing without change");
3452 r = 0;
3453 }
3454
3455 return r;
ecbfb9f1
HM
3456}
3457
f381e71b
JB
3458static void raid_resume(struct dm_target *ti)
3459{
3460 struct raid_set *rs = ti->private;
ecbfb9f1 3461 struct mddev *mddev = &rs->md;
f381e71b 3462
4286325b 3463 if (test_and_set_bit(RT_FLAG_RS_RESUMED, &rs->runtime_flags)) {
ecbfb9f1
HM
3464 /*
3465 * A secondary resume while the device is active.
3466 * Take this opportunity to check whether any failed
3467 * devices are reachable again.
3468 */
3469 attempt_restore_of_faulty_devices(rs);
6e20902e
HM
3470 } else {
3471 mddev->ro = 0;
3472 mddev->in_sync = 0;
34f8ac6d 3473
6e20902e
HM
3474 /*
3475 * When passing in flags to the ctr, we expect userspace
3476 * to reset them because they made it to the superblocks
3477 * and reload the mapping anyway.
3478 *
3479 * -> only unfreeze recovery in case of a table reload or
3480 * we'll have a bogus recovery/reshape position
3481 * retrieved from the superblock by the ctr because
3482 * the ongoing recovery/reshape will change it after read.
3483 */
3484 if (!test_bit(RT_FLAG_KEEP_RS_FROZEN, &rs->runtime_flags))
3485 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3a1c1ef2 3486
6e20902e
HM
3487 if (mddev->suspended)
3488 mddev_resume(mddev);
3489 }
9d09e663
N
3490}
3491
3492static struct target_type raid_target = {
3493 .name = "raid",
9b6e5423 3494 .version = {1, 9, 0},
9d09e663
N
3495 .module = THIS_MODULE,
3496 .ctr = raid_ctr,
3497 .dtr = raid_dtr,
3498 .map = raid_map,
3499 .status = raid_status,
be83651f 3500 .message = raid_message,
9d09e663
N
3501 .iterate_devices = raid_iterate_devices,
3502 .io_hints = raid_io_hints,
3503 .presuspend = raid_presuspend,
3504 .postsuspend = raid_postsuspend,
ecbfb9f1 3505 .preresume = raid_preresume,
9d09e663
N
3506 .resume = raid_resume,
3507};
3508
3509static int __init dm_raid_init(void)
3510{
fe5d2f4a
JB
3511 DMINFO("Loading target version %u.%u.%u",
3512 raid_target.version[0],
3513 raid_target.version[1],
3514 raid_target.version[2]);
9d09e663
N
3515 return dm_register_target(&raid_target);
3516}
3517
3518static void __exit dm_raid_exit(void)
3519{
3520 dm_unregister_target(&raid_target);
3521}
3522
3523module_init(dm_raid_init);
3524module_exit(dm_raid_exit);
3525
48cf06bc
HM
3526module_param(devices_handle_discard_safely, bool, 0644);
3527MODULE_PARM_DESC(devices_handle_discard_safely,
3528 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
3529
ef9b85a6
MS
3530MODULE_DESCRIPTION(DM_NAME " raid0/1/10/4/5/6 target");
3531MODULE_ALIAS("dm-raid0");
63f33b8d
JB
3532MODULE_ALIAS("dm-raid1");
3533MODULE_ALIAS("dm-raid10");
9d09e663
N
3534MODULE_ALIAS("dm-raid4");
3535MODULE_ALIAS("dm-raid5");
3536MODULE_ALIAS("dm-raid6");
3537MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
3a1c1ef2 3538MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>");
9d09e663 3539MODULE_LICENSE("GPL");