2 * Copyright (C) 2010-2011 Neil Brown
3 * Copyright (C) 2010-2016 Red Hat, Inc. All rights reserved.
5 * This file is released under the GPL.
8 #include <linux/slab.h>
9 #include <linux/module.h>
17 #include <linux/device-mapper.h>
19 #define DM_MSG_PREFIX "raid"
20 #define MAX_RAID_DEVICES 253 /* md-raid kernel limit */
23 * Minimum sectors of free reshape space per raid device
25 #define MIN_FREE_RESHAPE_SPACE to_sector(4*4096)
27 static bool devices_handle_discard_safely
= false;
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.
33 #define FirstUse 10 /* rdev flag */
37 * Two DM devices, one to hold metadata and one to hold the
38 * actual data/parity. The reason for this is to not confuse
39 * ti->len and give more flexibility in altering size and
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 ------|
48 struct dm_dev
*meta_dev
;
49 struct dm_dev
*data_dev
;
54 * Bits for establishing rs->ctr_flags
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 */
72 #define __CTR_FLAG_DELTA_DISKS 12 /* 2 */ /* Only with reshapable raid1/4/5/6/10! */
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! */
77 * Flags for rs->ctr_flags field.
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)
96 * Definitions of various constructor flags to
97 * be used in checks of valid / invalid flags
100 /* Define all any sync flags */
101 #define CTR_FLAGS_ANY_SYNC (CTR_FLAG_SYNC | CTR_FLAG_NOSYNC)
103 /* Define flags for options without argument (e.g. 'nosync') */
104 #define CTR_FLAG_OPTIONS_NO_ARGS (CTR_FLAGS_ANY_SYNC | \
105 CTR_FLAG_RAID10_USE_NEAR_SETS)
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 | \
117 CTR_FLAG_RAID10_FORMAT | \
118 CTR_FLAG_DELTA_DISKS | \
119 CTR_FLAG_DATA_OFFSET)
121 /* Valid options definitions per raid level... */
123 /* "raid0" does only accept data offset */
124 #define RAID0_VALID_FLAGS (CTR_FLAG_DATA_OFFSET)
126 /* "raid1" does not accept stripe cache, data offset, delta_disks or any raid10 options */
127 #define RAID1_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
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_DELTA_DISKS | \
136 CTR_FLAG_DATA_OFFSET)
138 /* "raid10" does not accept any raid1 or stripe cache options */
139 #define RAID10_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
141 CTR_FLAG_DAEMON_SLEEP | \
142 CTR_FLAG_MIN_RECOVERY_RATE | \
143 CTR_FLAG_MAX_RECOVERY_RATE | \
144 CTR_FLAG_REGION_SIZE | \
145 CTR_FLAG_RAID10_COPIES | \
146 CTR_FLAG_RAID10_FORMAT | \
147 CTR_FLAG_DELTA_DISKS | \
148 CTR_FLAG_DATA_OFFSET | \
149 CTR_FLAG_RAID10_USE_NEAR_SETS)
152 * "raid4/5/6" do not accept any raid1 or raid10 specific options
154 * "raid6" does not accept "nosync", because it is not guaranteed
155 * that both parity and q-syndrome are being written properly with
158 #define RAID45_VALID_FLAGS (CTR_FLAGS_ANY_SYNC | \
160 CTR_FLAG_DAEMON_SLEEP | \
161 CTR_FLAG_MIN_RECOVERY_RATE | \
162 CTR_FLAG_MAX_RECOVERY_RATE | \
163 CTR_FLAG_STRIPE_CACHE | \
164 CTR_FLAG_REGION_SIZE | \
165 CTR_FLAG_DELTA_DISKS | \
166 CTR_FLAG_DATA_OFFSET)
168 #define RAID6_VALID_FLAGS (CTR_FLAG_SYNC | \
170 CTR_FLAG_DAEMON_SLEEP | \
171 CTR_FLAG_MIN_RECOVERY_RATE | \
172 CTR_FLAG_MAX_RECOVERY_RATE | \
173 CTR_FLAG_STRIPE_CACHE | \
174 CTR_FLAG_REGION_SIZE | \
175 CTR_FLAG_DELTA_DISKS | \
176 CTR_FLAG_DATA_OFFSET)
177 /* ...valid options definitions per raid level */
180 * Flags for rs->runtime_flags field
181 * (RT_FLAG prefix meaning "runtime flag")
183 * These are all internal and used to define runtime state,
184 * e.g. to prevent another resume from preresume processing
185 * the raid set all over again.
187 #define RT_FLAG_RS_PRERESUMED 0
188 #define RT_FLAG_RS_RESUMED 1
189 #define RT_FLAG_RS_BITMAP_LOADED 2
190 #define RT_FLAG_UPDATE_SBS 3
191 #define RT_FLAG_RESHAPE_RS 4
193 /* Array elements of 64 bit needed for rebuild/failed disk bits */
194 #define DISKS_ARRAY_ELEMS ((MAX_RAID_DEVICES + (sizeof(uint64_t) * 8 - 1)) / sizeof(uint64_t) / 8)
197 * raid set level, layout and chunk sectors backup/restore
202 int new_chunk_sectors
;
206 struct dm_target
*ti
;
208 uint32_t bitmap_loaded
;
209 uint32_t stripe_cache_entries
;
210 unsigned long ctr_flags
;
211 unsigned long runtime_flags
;
213 uint64_t rebuild_disks
[DISKS_ARRAY_ELEMS
];
219 int requested_bitmap_chunk_sectors
;
222 struct raid_type
*raid_type
;
223 struct dm_target_callbacks callbacks
;
225 struct raid_dev dev
[0];
228 static void rs_config_backup(struct raid_set
*rs
, struct rs_layout
*l
)
230 struct mddev
*mddev
= &rs
->md
;
232 l
->new_level
= mddev
->new_level
;
233 l
->new_layout
= mddev
->new_layout
;
234 l
->new_chunk_sectors
= mddev
->new_chunk_sectors
;
237 static void rs_config_restore(struct raid_set
*rs
, struct rs_layout
*l
)
239 struct mddev
*mddev
= &rs
->md
;
241 mddev
->new_level
= l
->new_level
;
242 mddev
->new_layout
= l
->new_layout
;
243 mddev
->new_chunk_sectors
= l
->new_chunk_sectors
;
246 /* raid10 algorithms (i.e. formats) */
247 #define ALGORITHM_RAID10_DEFAULT 0
248 #define ALGORITHM_RAID10_NEAR 1
249 #define ALGORITHM_RAID10_OFFSET 2
250 #define ALGORITHM_RAID10_FAR 3
252 /* Supported raid types and properties. */
253 static struct raid_type
{
254 const char *name
; /* RAID algorithm. */
255 const char *descr
; /* Descriptor text for logging. */
256 const unsigned int parity_devs
; /* # of parity devices. */
257 const unsigned int minimal_devs
;/* minimal # of devices in set. */
258 const unsigned int level
; /* RAID level. */
259 const unsigned int algorithm
; /* RAID algorithm. */
261 {"raid0", "raid0 (striping)", 0, 2, 0, 0 /* NONE */},
262 {"raid1", "raid1 (mirroring)", 0, 2, 1, 0 /* NONE */},
263 {"raid10_far", "raid10 far (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_FAR
},
264 {"raid10_offset", "raid10 offset (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_OFFSET
},
265 {"raid10_near", "raid10 near (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_NEAR
},
266 {"raid10", "raid10 (striped mirrors)", 0, 2, 10, ALGORITHM_RAID10_DEFAULT
},
267 {"raid4", "raid4 (dedicated first parity disk)", 1, 2, 5, ALGORITHM_PARITY_0
}, /* raid4 layout = raid5_0 */
268 {"raid5_n", "raid5 (dedicated last parity disk)", 1, 2, 5, ALGORITHM_PARITY_N
},
269 {"raid5_ls", "raid5 (left symmetric)", 1, 2, 5, ALGORITHM_LEFT_SYMMETRIC
},
270 {"raid5_rs", "raid5 (right symmetric)", 1, 2, 5, ALGORITHM_RIGHT_SYMMETRIC
},
271 {"raid5_la", "raid5 (left asymmetric)", 1, 2, 5, ALGORITHM_LEFT_ASYMMETRIC
},
272 {"raid5_ra", "raid5 (right asymmetric)", 1, 2, 5, ALGORITHM_RIGHT_ASYMMETRIC
},
273 {"raid6_zr", "raid6 (zero restart)", 2, 4, 6, ALGORITHM_ROTATING_ZERO_RESTART
},
274 {"raid6_nr", "raid6 (N restart)", 2, 4, 6, ALGORITHM_ROTATING_N_RESTART
},
275 {"raid6_nc", "raid6 (N continue)", 2, 4, 6, ALGORITHM_ROTATING_N_CONTINUE
},
276 {"raid6_n_6", "raid6 (dedicated parity/Q n/6)", 2, 4, 6, ALGORITHM_PARITY_N_6
},
277 {"raid6_ls_6", "raid6 (left symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_SYMMETRIC_6
},
278 {"raid6_rs_6", "raid6 (right symmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_SYMMETRIC_6
},
279 {"raid6_la_6", "raid6 (left asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_LEFT_ASYMMETRIC_6
},
280 {"raid6_ra_6", "raid6 (right asymmetric dedicated Q 6)", 2, 4, 6, ALGORITHM_RIGHT_ASYMMETRIC_6
}
283 /* True, if @v is in inclusive range [@min, @max] */
284 static bool __within_range(long v
, long min
, long max
)
286 return v
>= min
&& v
<= max
;
289 /* All table line arguments are defined here */
290 static struct arg_name_flag
{
291 const unsigned long flag
;
293 } __arg_name_flags
[] = {
294 { CTR_FLAG_SYNC
, "sync"},
295 { CTR_FLAG_NOSYNC
, "nosync"},
296 { CTR_FLAG_REBUILD
, "rebuild"},
297 { CTR_FLAG_DAEMON_SLEEP
, "daemon_sleep"},
298 { CTR_FLAG_MIN_RECOVERY_RATE
, "min_recovery_rate"},
299 { CTR_FLAG_MAX_RECOVERY_RATE
, "max_recovery_rate"},
300 { CTR_FLAG_MAX_WRITE_BEHIND
, "max_write_behind"},
301 { CTR_FLAG_WRITE_MOSTLY
, "write_mostly"},
302 { CTR_FLAG_STRIPE_CACHE
, "stripe_cache"},
303 { CTR_FLAG_REGION_SIZE
, "region_size"},
304 { CTR_FLAG_RAID10_COPIES
, "raid10_copies"},
305 { CTR_FLAG_RAID10_FORMAT
, "raid10_format"},
306 { CTR_FLAG_DATA_OFFSET
, "data_offset"},
307 { CTR_FLAG_DELTA_DISKS
, "delta_disks"},
308 { CTR_FLAG_RAID10_USE_NEAR_SETS
, "raid10_use_near_sets"},
311 /* Return argument name string for given @flag */
312 static const char *dm_raid_arg_name_by_flag(const uint32_t flag
)
314 if (hweight32(flag
) == 1) {
315 struct arg_name_flag
*anf
= __arg_name_flags
+ ARRAY_SIZE(__arg_name_flags
);
317 while (anf
-- > __arg_name_flags
)
318 if (flag
& anf
->flag
)
322 DMERR("%s called with more than one flag!", __func__
);
328 * Bool helpers to test for various raid levels of a raid set.
329 * It's level as reported by the superblock rather than
330 * the requested raid_type passed to the constructor.
332 /* Return true, if raid set in @rs is raid0 */
333 static bool rs_is_raid0(struct raid_set
*rs
)
335 return !rs
->md
.level
;
338 /* Return true, if raid set in @rs is raid1 */
339 static bool rs_is_raid1(struct raid_set
*rs
)
341 return rs
->md
.level
== 1;
344 /* Return true, if raid set in @rs is raid10 */
345 static bool rs_is_raid10(struct raid_set
*rs
)
347 return rs
->md
.level
== 10;
350 /* Return true, if raid set in @rs is level 6 */
351 static bool rs_is_raid6(struct raid_set
*rs
)
353 return rs
->md
.level
== 6;
356 /* Return true, if raid set in @rs is level 4, 5 or 6 */
357 static bool rs_is_raid456(struct raid_set
*rs
)
359 return __within_range(rs
->md
.level
, 4, 6);
362 /* Return true, if raid set in @rs is reshapable */
363 static bool __is_raid10_far(int layout
);
364 static bool rs_is_reshapable(struct raid_set
*rs
)
366 return rs_is_raid456(rs
) ||
367 (rs_is_raid10(rs
) && !__is_raid10_far(rs
->md
.new_layout
));
370 /* Return true, if raid set in @rs is recovering */
371 static bool rs_is_recovering(struct raid_set
*rs
)
373 return rs
->md
.recovery_cp
< rs
->dev
[0].rdev
.sectors
;
376 /* Return true, if raid set in @rs is reshaping */
377 static bool rs_is_reshaping(struct raid_set
*rs
)
379 return rs
->md
.reshape_position
!= MaxSector
;
383 * bool helpers to test for various raid levels of a raid type @rt
386 /* Return true, if raid type in @rt is raid0 */
387 static bool rt_is_raid0(struct raid_type
*rt
)
392 /* Return true, if raid type in @rt is raid1 */
393 static bool rt_is_raid1(struct raid_type
*rt
)
395 return rt
->level
== 1;
398 /* Return true, if raid type in @rt is raid10 */
399 static bool rt_is_raid10(struct raid_type
*rt
)
401 return rt
->level
== 10;
404 /* Return true, if raid type in @rt is raid4/5 */
405 static bool rt_is_raid45(struct raid_type
*rt
)
407 return __within_range(rt
->level
, 4, 5);
410 /* Return true, if raid type in @rt is raid6 */
411 static bool rt_is_raid6(struct raid_type
*rt
)
413 return rt
->level
== 6;
416 /* Return true, if raid type in @rt is raid4/5/6 */
417 static bool rt_is_raid456(struct raid_type
*rt
)
419 return __within_range(rt
->level
, 4, 6);
421 /* END: raid level bools */
423 /* Return valid ctr flags for the raid level of @rs */
424 static unsigned long __valid_flags(struct raid_set
*rs
)
426 if (rt_is_raid0(rs
->raid_type
))
427 return RAID0_VALID_FLAGS
;
428 else if (rt_is_raid1(rs
->raid_type
))
429 return RAID1_VALID_FLAGS
;
430 else if (rt_is_raid10(rs
->raid_type
))
431 return RAID10_VALID_FLAGS
;
432 else if (rt_is_raid45(rs
->raid_type
))
433 return RAID45_VALID_FLAGS
;
434 else if (rt_is_raid6(rs
->raid_type
))
435 return RAID6_VALID_FLAGS
;
441 * Check for valid flags set on @rs
443 * Has to be called after parsing of the ctr flags!
445 static int rs_check_for_valid_flags(struct raid_set
*rs
)
447 if (rs
->ctr_flags
& ~__valid_flags(rs
)) {
448 rs
->ti
->error
= "Invalid flags combination";
455 /* MD raid10 bit definitions and helpers */
456 #define RAID10_OFFSET (1 << 16) /* stripes with data copies area adjacent on devices */
457 #define RAID10_BROCKEN_USE_FAR_SETS (1 << 17) /* Broken in raid10.c: use sets instead of whole stripe rotation */
458 #define RAID10_USE_FAR_SETS (1 << 18) /* Use sets instead of whole stripe rotation */
459 #define RAID10_FAR_COPIES_SHIFT 8 /* raid10 # far copies shift (2nd byte of layout) */
461 /* Return md raid10 near copies for @layout */
462 static unsigned int __raid10_near_copies(int layout
)
464 return layout
& 0xFF;
467 /* Return md raid10 far copies for @layout */
468 static unsigned int __raid10_far_copies(int layout
)
470 return __raid10_near_copies(layout
>> RAID10_FAR_COPIES_SHIFT
);
473 /* Return true if md raid10 offset for @layout */
474 static bool __is_raid10_offset(int layout
)
476 return !!(layout
& RAID10_OFFSET
);
479 /* Return true if md raid10 near for @layout */
480 static bool __is_raid10_near(int layout
)
482 return !__is_raid10_offset(layout
) && __raid10_near_copies(layout
) > 1;
485 /* Return true if md raid10 far for @layout */
486 static bool __is_raid10_far(int layout
)
488 return !__is_raid10_offset(layout
) && __raid10_far_copies(layout
) > 1;
491 /* Return md raid10 layout string for @layout */
492 static const char *raid10_md_layout_to_format(int layout
)
495 * Bit 16 stands for "offset"
496 * (i.e. adjacent stripes hold copies)
498 * Refer to MD's raid10.c for details
500 if (__is_raid10_offset(layout
))
503 if (__raid10_near_copies(layout
) > 1)
506 WARN_ON(__raid10_far_copies(layout
) < 2);
511 /* Return md raid10 algorithm for @name */
512 static int raid10_name_to_format(const char *name
)
514 if (!strcasecmp(name
, "near"))
515 return ALGORITHM_RAID10_NEAR
;
516 else if (!strcasecmp(name
, "offset"))
517 return ALGORITHM_RAID10_OFFSET
;
518 else if (!strcasecmp(name
, "far"))
519 return ALGORITHM_RAID10_FAR
;
524 /* Return md raid10 copies for @layout */
525 static unsigned int raid10_md_layout_to_copies(int layout
)
527 return max(__raid10_near_copies(layout
), __raid10_far_copies(layout
));
530 /* Return md raid10 format id for @format string */
531 static int raid10_format_to_md_layout(struct raid_set
*rs
,
532 unsigned int algorithm
,
535 unsigned int n
= 1, f
= 1, r
= 0;
538 * MD resilienece flaw:
540 * enabling use_far_sets for far/offset formats causes copies
541 * to be colocated on the same devs together with their origins!
543 * -> disable it for now in the definition above
545 if (algorithm
== ALGORITHM_RAID10_DEFAULT
||
546 algorithm
== ALGORITHM_RAID10_NEAR
)
549 else if (algorithm
== ALGORITHM_RAID10_OFFSET
) {
552 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS
, &rs
->ctr_flags
))
553 r
|= RAID10_USE_FAR_SETS
;
555 } else if (algorithm
== ALGORITHM_RAID10_FAR
) {
558 if (!test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS
, &rs
->ctr_flags
))
559 r
|= RAID10_USE_FAR_SETS
;
564 return r
| (f
<< RAID10_FAR_COPIES_SHIFT
) | n
;
566 /* END: MD raid10 bit definitions and helpers */
568 /* Check for any of the raid10 algorithms */
569 static bool __got_raid10(struct raid_type
*rtp
, const int layout
)
571 if (rtp
->level
== 10) {
572 switch (rtp
->algorithm
) {
573 case ALGORITHM_RAID10_DEFAULT
:
574 case ALGORITHM_RAID10_NEAR
:
575 return __is_raid10_near(layout
);
576 case ALGORITHM_RAID10_OFFSET
:
577 return __is_raid10_offset(layout
);
578 case ALGORITHM_RAID10_FAR
:
579 return __is_raid10_far(layout
);
588 /* Return raid_type for @name */
589 static struct raid_type
*get_raid_type(const char *name
)
591 struct raid_type
*rtp
= raid_types
+ ARRAY_SIZE(raid_types
);
593 while (rtp
-- > raid_types
)
594 if (!strcasecmp(rtp
->name
, name
))
600 /* Return raid_type for @name based derived from @level and @layout */
601 static struct raid_type
*get_raid_type_by_ll(const int level
, const int layout
)
603 struct raid_type
*rtp
= raid_types
+ ARRAY_SIZE(raid_types
);
605 while (rtp
-- > raid_types
) {
606 /* RAID10 special checks based on @layout flags/properties */
607 if (rtp
->level
== level
&&
608 (__got_raid10(rtp
, layout
) || rtp
->algorithm
== layout
))
616 * Conditionally change bdev capacity of @rs
617 * in case of a disk add/remove reshape
619 static void rs_set_capacity(struct raid_set
*rs
)
621 struct mddev
*mddev
= &rs
->md
;
622 struct md_rdev
*rdev
;
623 struct gendisk
*gendisk
= dm_disk(dm_table_get_md(rs
->ti
->table
));
626 * raid10 sets rdev->sector to the device size, which
627 * is unintended in case of out-of-place reshaping
629 rdev_for_each(rdev
, mddev
)
630 rdev
->sectors
= mddev
->dev_sectors
;
632 set_capacity(gendisk
, mddev
->array_sectors
);
633 revalidate_disk(gendisk
);
637 * Set the mddev properties in @rs to the current
638 * ones retrieved from the freshest superblock
640 static void rs_set_cur(struct raid_set
*rs
)
642 struct mddev
*mddev
= &rs
->md
;
644 mddev
->new_level
= mddev
->level
;
645 mddev
->new_layout
= mddev
->layout
;
646 mddev
->new_chunk_sectors
= mddev
->chunk_sectors
;
650 * Set the mddev properties in @rs to the new
651 * ones requested by the ctr
653 static void rs_set_new(struct raid_set
*rs
)
655 struct mddev
*mddev
= &rs
->md
;
657 mddev
->level
= mddev
->new_level
;
658 mddev
->layout
= mddev
->new_layout
;
659 mddev
->chunk_sectors
= mddev
->new_chunk_sectors
;
660 mddev
->raid_disks
= rs
->raid_disks
;
661 mddev
->delta_disks
= 0;
664 static struct raid_set
*raid_set_alloc(struct dm_target
*ti
, struct raid_type
*raid_type
,
665 unsigned int raid_devs
)
670 if (raid_devs
<= raid_type
->parity_devs
) {
671 ti
->error
= "Insufficient number of devices";
672 return ERR_PTR(-EINVAL
);
675 rs
= kzalloc(sizeof(*rs
) + raid_devs
* sizeof(rs
->dev
[0]), GFP_KERNEL
);
677 ti
->error
= "Cannot allocate raid context";
678 return ERR_PTR(-ENOMEM
);
683 rs
->raid_disks
= raid_devs
;
687 rs
->raid_type
= raid_type
;
688 rs
->stripe_cache_entries
= 256;
689 rs
->md
.raid_disks
= raid_devs
;
690 rs
->md
.level
= raid_type
->level
;
691 rs
->md
.new_level
= rs
->md
.level
;
692 rs
->md
.layout
= raid_type
->algorithm
;
693 rs
->md
.new_layout
= rs
->md
.layout
;
694 rs
->md
.delta_disks
= 0;
695 rs
->md
.recovery_cp
= MaxSector
;
697 for (i
= 0; i
< raid_devs
; i
++)
698 md_rdev_init(&rs
->dev
[i
].rdev
);
701 * Remaining items to be initialized by further RAID params:
704 * rs->md.chunk_sectors
705 * rs->md.new_chunk_sectors
712 static void raid_set_free(struct raid_set
*rs
)
716 for (i
= 0; i
< rs
->raid_disks
; i
++) {
717 if (rs
->dev
[i
].meta_dev
)
718 dm_put_device(rs
->ti
, rs
->dev
[i
].meta_dev
);
719 md_rdev_clear(&rs
->dev
[i
].rdev
);
720 if (rs
->dev
[i
].data_dev
)
721 dm_put_device(rs
->ti
, rs
->dev
[i
].data_dev
);
728 * For every device we have two words
729 * <meta_dev>: meta device name or '-' if missing
730 * <data_dev>: data device name or '-' if missing
732 * The following are permitted:
735 * <meta_dev> <data_dev>
737 * The following is not allowed:
740 * This code parses those words. If there is a failure,
741 * the caller must use raid_set_free() to unwind the operations.
743 static int parse_dev_params(struct raid_set
*rs
, struct dm_arg_set
*as
)
747 int metadata_available
= 0;
751 /* Put off the number of raid devices argument to get to dev pairs */
752 arg
= dm_shift_arg(as
);
756 for (i
= 0; i
< rs
->raid_disks
; i
++) {
757 rs
->dev
[i
].rdev
.raid_disk
= i
;
759 rs
->dev
[i
].meta_dev
= NULL
;
760 rs
->dev
[i
].data_dev
= NULL
;
763 * There are no offsets, since there is a separate device
764 * for data and metadata.
766 rs
->dev
[i
].rdev
.data_offset
= 0;
767 rs
->dev
[i
].rdev
.mddev
= &rs
->md
;
769 arg
= dm_shift_arg(as
);
773 if (strcmp(arg
, "-")) {
774 r
= dm_get_device(rs
->ti
, arg
, dm_table_get_mode(rs
->ti
->table
),
775 &rs
->dev
[i
].meta_dev
);
777 rs
->ti
->error
= "RAID metadata device lookup failure";
781 rs
->dev
[i
].rdev
.sb_page
= alloc_page(GFP_KERNEL
);
782 if (!rs
->dev
[i
].rdev
.sb_page
) {
783 rs
->ti
->error
= "Failed to allocate superblock page";
788 arg
= dm_shift_arg(as
);
792 if (!strcmp(arg
, "-")) {
793 if (!test_bit(In_sync
, &rs
->dev
[i
].rdev
.flags
) &&
794 (!rs
->dev
[i
].rdev
.recovery_offset
)) {
795 rs
->ti
->error
= "Drive designated for rebuild not specified";
799 if (rs
->dev
[i
].meta_dev
) {
800 rs
->ti
->error
= "No data device supplied with metadata device";
807 r
= dm_get_device(rs
->ti
, arg
, dm_table_get_mode(rs
->ti
->table
),
808 &rs
->dev
[i
].data_dev
);
810 rs
->ti
->error
= "RAID device lookup failure";
814 if (rs
->dev
[i
].meta_dev
) {
815 metadata_available
= 1;
816 rs
->dev
[i
].rdev
.meta_bdev
= rs
->dev
[i
].meta_dev
->bdev
;
818 rs
->dev
[i
].rdev
.bdev
= rs
->dev
[i
].data_dev
->bdev
;
819 list_add_tail(&rs
->dev
[i
].rdev
.same_set
, &rs
->md
.disks
);
820 if (!test_bit(In_sync
, &rs
->dev
[i
].rdev
.flags
))
824 if (metadata_available
) {
826 rs
->md
.persistent
= 1;
827 rs
->md
.major_version
= 2;
828 } else if (rebuild
&& !rs
->md
.recovery_cp
) {
830 * Without metadata, we will not be able to tell if the array
831 * is in-sync or not - we must assume it is not. Therefore,
832 * it is impossible to rebuild a drive.
834 * Even if there is metadata, the on-disk information may
835 * indicate that the array is not in-sync and it will then
838 * User could specify 'nosync' option if desperate.
840 rs
->ti
->error
= "Unable to rebuild drive while array is not in-sync";
848 * validate_region_size
850 * @region_size: region size in sectors. If 0, pick a size (4MiB default).
852 * Set rs->md.bitmap_info.chunksize (which really refers to 'region size').
853 * Ensure that (ti->len/region_size < 2^21) - required by MD bitmap.
855 * Returns: 0 on success, -EINVAL on failure.
857 static int validate_region_size(struct raid_set
*rs
, unsigned long region_size
)
859 unsigned long min_region_size
= rs
->ti
->len
/ (1 << 21);
866 * Choose a reasonable default. All figures in sectors.
868 if (min_region_size
> (1 << 13)) {
869 /* If not a power of 2, make it the next power of 2 */
870 region_size
= roundup_pow_of_two(min_region_size
);
871 DMINFO("Choosing default region size of %lu sectors",
874 DMINFO("Choosing default region size of 4MiB");
875 region_size
= 1 << 13; /* sectors */
879 * Validate user-supplied value.
881 if (region_size
> rs
->ti
->len
) {
882 rs
->ti
->error
= "Supplied region size is too large";
886 if (region_size
< min_region_size
) {
887 DMERR("Supplied region_size (%lu sectors) below minimum (%lu)",
888 region_size
, min_region_size
);
889 rs
->ti
->error
= "Supplied region size is too small";
893 if (!is_power_of_2(region_size
)) {
894 rs
->ti
->error
= "Region size is not a power of 2";
898 if (region_size
< rs
->md
.chunk_sectors
) {
899 rs
->ti
->error
= "Region size is smaller than the chunk size";
905 * Convert sectors to bytes.
907 rs
->md
.bitmap_info
.chunksize
= to_bytes(region_size
);
913 * validate_raid_redundancy
916 * Determine if there are enough devices in the array that haven't
917 * failed (or are being rebuilt) to form a usable array.
919 * Returns: 0 on success, -EINVAL on failure.
921 static int validate_raid_redundancy(struct raid_set
*rs
)
923 unsigned int i
, rebuild_cnt
= 0;
924 unsigned int rebuilds_per_group
= 0, copies
;
925 unsigned int group_size
, last_group_start
;
927 for (i
= 0; i
< rs
->md
.raid_disks
; i
++)
928 if (!test_bit(In_sync
, &rs
->dev
[i
].rdev
.flags
) ||
929 !rs
->dev
[i
].rdev
.sb_page
)
932 switch (rs
->raid_type
->level
) {
936 if (rebuild_cnt
>= rs
->md
.raid_disks
)
942 if (rebuild_cnt
> rs
->raid_type
->parity_devs
)
946 copies
= raid10_md_layout_to_copies(rs
->md
.new_layout
);
947 if (rebuild_cnt
< copies
)
951 * It is possible to have a higher rebuild count for RAID10,
952 * as long as the failed devices occur in different mirror
953 * groups (i.e. different stripes).
955 * When checking "near" format, make sure no adjacent devices
956 * have failed beyond what can be handled. In addition to the
957 * simple case where the number of devices is a multiple of the
958 * number of copies, we must also handle cases where the number
959 * of devices is not a multiple of the number of copies.
960 * E.g. dev1 dev2 dev3 dev4 dev5
964 if (__is_raid10_near(rs
->md
.new_layout
)) {
965 for (i
= 0; i
< rs
->md
.raid_disks
; i
++) {
967 rebuilds_per_group
= 0;
968 if ((!rs
->dev
[i
].rdev
.sb_page
||
969 !test_bit(In_sync
, &rs
->dev
[i
].rdev
.flags
)) &&
970 (++rebuilds_per_group
>= copies
))
977 * When checking "far" and "offset" formats, we need to ensure
978 * that the device that holds its copy is not also dead or
979 * being rebuilt. (Note that "far" and "offset" formats only
980 * support two copies right now. These formats also only ever
981 * use the 'use_far_sets' variant.)
983 * This check is somewhat complicated by the need to account
984 * for arrays that are not a multiple of (far) copies. This
985 * results in the need to treat the last (potentially larger)
988 group_size
= (rs
->md
.raid_disks
/ copies
);
989 last_group_start
= (rs
->md
.raid_disks
/ group_size
) - 1;
990 last_group_start
*= group_size
;
991 for (i
= 0; i
< rs
->md
.raid_disks
; i
++) {
992 if (!(i
% copies
) && !(i
> last_group_start
))
993 rebuilds_per_group
= 0;
994 if ((!rs
->dev
[i
].rdev
.sb_page
||
995 !test_bit(In_sync
, &rs
->dev
[i
].rdev
.flags
)) &&
996 (++rebuilds_per_group
>= copies
))
1012 * Possible arguments are...
1013 * <chunk_size> [optional_args]
1015 * Argument definitions
1016 * <chunk_size> The number of sectors per disk that
1017 * will form the "stripe"
1018 * [[no]sync] Force or prevent recovery of the
1020 * [rebuild <idx>] Rebuild the drive indicated by the index
1021 * [daemon_sleep <ms>] Time between bitmap daemon work to
1023 * [min_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1024 * [max_recovery_rate <kB/sec/disk>] Throttle RAID initialization
1025 * [write_mostly <idx>] Indicate a write mostly drive via index
1026 * [max_write_behind <sectors>] See '-write-behind=' (man mdadm)
1027 * [stripe_cache <sectors>] Stripe cache size for higher RAIDs
1028 * [region_size <sectors>] Defines granularity of bitmap
1030 * RAID10-only options:
1031 * [raid10_copies <# copies>] Number of copies. (Default: 2)
1032 * [raid10_format <near|far|offset>] Layout algorithm. (Default: near)
1034 static int parse_raid_params(struct raid_set
*rs
, struct dm_arg_set
*as
,
1035 unsigned int num_raid_params
)
1037 int value
, raid10_format
= ALGORITHM_RAID10_DEFAULT
;
1038 unsigned int raid10_copies
= 2;
1039 unsigned int i
, write_mostly
= 0;
1040 unsigned int region_size
= 0;
1041 sector_t max_io_len
;
1042 const char *arg
, *key
;
1043 struct raid_dev
*rd
;
1044 struct raid_type
*rt
= rs
->raid_type
;
1046 arg
= dm_shift_arg(as
);
1047 num_raid_params
--; /* Account for chunk_size argument */
1049 if (kstrtoint(arg
, 10, &value
) < 0) {
1050 rs
->ti
->error
= "Bad numerical argument given for chunk_size";
1055 * First, parse the in-order required arguments
1056 * "chunk_size" is the only argument of this type.
1058 if (rt_is_raid1(rt
)) {
1060 DMERR("Ignoring chunk size parameter for RAID 1");
1062 } else if (!is_power_of_2(value
)) {
1063 rs
->ti
->error
= "Chunk size must be a power of 2";
1065 } else if (value
< 8) {
1066 rs
->ti
->error
= "Chunk size value is too small";
1070 rs
->md
.new_chunk_sectors
= rs
->md
.chunk_sectors
= value
;
1073 * We set each individual device as In_sync with a completed
1074 * 'recovery_offset'. If there has been a device failure or
1075 * replacement then one of the following cases applies:
1077 * 1) User specifies 'rebuild'.
1078 * - Device is reset when param is read.
1079 * 2) A new device is supplied.
1080 * - No matching superblock found, resets device.
1081 * 3) Device failure was transient and returns on reload.
1082 * - Failure noticed, resets device for bitmap replay.
1083 * 4) Device hadn't completed recovery after previous failure.
1084 * - Superblock is read and overrides recovery_offset.
1086 * What is found in the superblocks of the devices is always
1087 * authoritative, unless 'rebuild' or '[no]sync' was specified.
1089 for (i
= 0; i
< rs
->raid_disks
; i
++) {
1090 set_bit(In_sync
, &rs
->dev
[i
].rdev
.flags
);
1091 rs
->dev
[i
].rdev
.recovery_offset
= MaxSector
;
1095 * Second, parse the unordered optional arguments
1097 for (i
= 0; i
< num_raid_params
; i
++) {
1098 key
= dm_shift_arg(as
);
1100 rs
->ti
->error
= "Not enough raid parameters given";
1104 if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC
))) {
1105 if (test_and_set_bit(__CTR_FLAG_NOSYNC
, &rs
->ctr_flags
)) {
1106 rs
->ti
->error
= "Only one 'nosync' argument allowed";
1111 if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_SYNC
))) {
1112 if (test_and_set_bit(__CTR_FLAG_SYNC
, &rs
->ctr_flags
)) {
1113 rs
->ti
->error
= "Only one 'sync' argument allowed";
1118 if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_USE_NEAR_SETS
))) {
1119 if (test_and_set_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS
, &rs
->ctr_flags
)) {
1120 rs
->ti
->error
= "Only one 'raid10_use_new_sets' argument allowed";
1126 arg
= dm_shift_arg(as
);
1127 i
++; /* Account for the argument pairs */
1129 rs
->ti
->error
= "Wrong number of raid parameters given";
1134 * Parameters that take a string value are checked here.
1137 if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT
))) {
1138 if (test_and_set_bit(__CTR_FLAG_RAID10_FORMAT
, &rs
->ctr_flags
)) {
1139 rs
->ti
->error
= "Only one 'raid10_format' argument pair allowed";
1142 if (!rt_is_raid10(rt
)) {
1143 rs
->ti
->error
= "'raid10_format' is an invalid parameter for this RAID type";
1146 raid10_format
= raid10_name_to_format(arg
);
1147 if (raid10_format
< 0) {
1148 rs
->ti
->error
= "Invalid 'raid10_format' value given";
1149 return raid10_format
;
1154 if (kstrtoint(arg
, 10, &value
) < 0) {
1155 rs
->ti
->error
= "Bad numerical argument given in raid params";
1159 if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD
))) {
1161 * "rebuild" is being passed in by userspace to provide
1162 * indexes of replaced devices and to set up additional
1163 * devices on raid level takeover.
1165 if (!__within_range(value
, 0, rs
->raid_disks
- 1)) {
1166 rs
->ti
->error
= "Invalid rebuild index given";
1170 if (test_and_set_bit(value
, (void *) rs
->rebuild_disks
)) {
1171 rs
->ti
->error
= "rebuild for this index already given";
1175 rd
= rs
->dev
+ value
;
1176 clear_bit(In_sync
, &rd
->rdev
.flags
);
1177 clear_bit(Faulty
, &rd
->rdev
.flags
);
1178 rd
->rdev
.recovery_offset
= 0;
1179 set_bit(__CTR_FLAG_REBUILD
, &rs
->ctr_flags
);
1180 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY
))) {
1181 if (!rt_is_raid1(rt
)) {
1182 rs
->ti
->error
= "write_mostly option is only valid for RAID1";
1186 if (!__within_range(value
, 0, rs
->md
.raid_disks
- 1)) {
1187 rs
->ti
->error
= "Invalid write_mostly index given";
1192 set_bit(WriteMostly
, &rs
->dev
[value
].rdev
.flags
);
1193 set_bit(__CTR_FLAG_WRITE_MOSTLY
, &rs
->ctr_flags
);
1194 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND
))) {
1195 if (!rt_is_raid1(rt
)) {
1196 rs
->ti
->error
= "max_write_behind option is only valid for RAID1";
1200 if (test_and_set_bit(__CTR_FLAG_MAX_WRITE_BEHIND
, &rs
->ctr_flags
)) {
1201 rs
->ti
->error
= "Only one max_write_behind argument pair allowed";
1206 * In device-mapper, we specify things in sectors, but
1207 * MD records this value in kB
1210 if (value
> COUNTER_MAX
) {
1211 rs
->ti
->error
= "Max write-behind limit out of range";
1215 rs
->md
.bitmap_info
.max_write_behind
= value
;
1216 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP
))) {
1217 if (test_and_set_bit(__CTR_FLAG_DAEMON_SLEEP
, &rs
->ctr_flags
)) {
1218 rs
->ti
->error
= "Only one daemon_sleep argument pair allowed";
1221 if (!value
|| (value
> MAX_SCHEDULE_TIMEOUT
)) {
1222 rs
->ti
->error
= "daemon sleep period out of range";
1225 rs
->md
.bitmap_info
.daemon_sleep
= value
;
1226 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET
))) {
1227 /* Userspace passes new data_offset after having extended the the data image LV */
1228 if (test_and_set_bit(__CTR_FLAG_DATA_OFFSET
, &rs
->ctr_flags
)) {
1229 rs
->ti
->error
= "Only one data_offset argument pair allowed";
1232 /* Ensure sensible data offset */
1234 (value
&& (value
< MIN_FREE_RESHAPE_SPACE
|| value
% to_sector(PAGE_SIZE
)))) {
1235 rs
->ti
->error
= "Bogus data_offset value";
1238 rs
->data_offset
= value
;
1239 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS
))) {
1240 /* Define the +/-# of disks to add to/remove from the given raid set */
1241 if (test_and_set_bit(__CTR_FLAG_DELTA_DISKS
, &rs
->ctr_flags
)) {
1242 rs
->ti
->error
= "Only one delta_disks argument pair allowed";
1245 /* Ensure MAX_RAID_DEVICES and raid type minimal_devs! */
1246 if (!__within_range(abs(value
), 1, MAX_RAID_DEVICES
- rt
->minimal_devs
)) {
1247 rs
->ti
->error
= "Too many delta_disk requested";
1251 rs
->delta_disks
= value
;
1252 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE
))) {
1253 if (test_and_set_bit(__CTR_FLAG_STRIPE_CACHE
, &rs
->ctr_flags
)) {
1254 rs
->ti
->error
= "Only one stripe_cache argument pair allowed";
1258 if (!rt_is_raid456(rt
)) {
1259 rs
->ti
->error
= "Inappropriate argument: stripe_cache";
1263 rs
->stripe_cache_entries
= value
;
1264 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE
))) {
1265 if (test_and_set_bit(__CTR_FLAG_MIN_RECOVERY_RATE
, &rs
->ctr_flags
)) {
1266 rs
->ti
->error
= "Only one min_recovery_rate argument pair allowed";
1269 if (value
> INT_MAX
) {
1270 rs
->ti
->error
= "min_recovery_rate out of range";
1273 rs
->md
.sync_speed_min
= (int)value
;
1274 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE
))) {
1275 if (test_and_set_bit(__CTR_FLAG_MAX_RECOVERY_RATE
, &rs
->ctr_flags
)) {
1276 rs
->ti
->error
= "Only one max_recovery_rate argument pair allowed";
1279 if (value
> INT_MAX
) {
1280 rs
->ti
->error
= "max_recovery_rate out of range";
1283 rs
->md
.sync_speed_max
= (int)value
;
1284 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE
))) {
1285 if (test_and_set_bit(__CTR_FLAG_REGION_SIZE
, &rs
->ctr_flags
)) {
1286 rs
->ti
->error
= "Only one region_size argument pair allowed";
1290 region_size
= value
;
1291 rs
->requested_bitmap_chunk_sectors
= value
;
1292 } else if (!strcasecmp(key
, dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES
))) {
1293 if (test_and_set_bit(__CTR_FLAG_RAID10_COPIES
, &rs
->ctr_flags
)) {
1294 rs
->ti
->error
= "Only one raid10_copies argument pair allowed";
1298 if (!__within_range(value
, 2, rs
->md
.raid_disks
)) {
1299 rs
->ti
->error
= "Bad value for 'raid10_copies'";
1303 raid10_copies
= value
;
1305 DMERR("Unable to parse RAID parameter: %s", key
);
1306 rs
->ti
->error
= "Unable to parse RAID parameter";
1311 if (test_bit(__CTR_FLAG_SYNC
, &rs
->ctr_flags
) &&
1312 test_bit(__CTR_FLAG_NOSYNC
, &rs
->ctr_flags
)) {
1313 rs
->ti
->error
= "sync and nosync are mutually exclusive";
1317 if (test_bit(__CTR_FLAG_REBUILD
, &rs
->ctr_flags
) &&
1318 (test_bit(__CTR_FLAG_SYNC
, &rs
->ctr_flags
) ||
1319 test_bit(__CTR_FLAG_NOSYNC
, &rs
->ctr_flags
))) {
1320 rs
->ti
->error
= "sync/nosync and rebuild are mutually exclusive";
1324 if (write_mostly
>= rs
->md
.raid_disks
) {
1325 rs
->ti
->error
= "Can't set all raid1 devices to write_mostly";
1329 if (validate_region_size(rs
, region_size
))
1332 if (rs
->md
.chunk_sectors
)
1333 max_io_len
= rs
->md
.chunk_sectors
;
1335 max_io_len
= region_size
;
1337 if (dm_set_target_max_io_len(rs
->ti
, max_io_len
))
1340 if (rt_is_raid10(rt
)) {
1341 if (raid10_copies
> rs
->md
.raid_disks
) {
1342 rs
->ti
->error
= "Not enough devices to satisfy specification";
1346 rs
->md
.new_layout
= raid10_format_to_md_layout(rs
, raid10_format
, raid10_copies
);
1347 if (rs
->md
.new_layout
< 0) {
1348 rs
->ti
->error
= "Error getting raid10 format";
1349 return rs
->md
.new_layout
;
1352 rt
= get_raid_type_by_ll(10, rs
->md
.new_layout
);
1354 rs
->ti
->error
= "Failed to recognize new raid10 layout";
1358 if ((rt
->algorithm
== ALGORITHM_RAID10_DEFAULT
||
1359 rt
->algorithm
== ALGORITHM_RAID10_NEAR
) &&
1360 test_bit(__CTR_FLAG_RAID10_USE_NEAR_SETS
, &rs
->ctr_flags
)) {
1361 rs
->ti
->error
= "RAID10 format 'near' and 'raid10_use_near_sets' are incompatible";
1366 rs
->raid10_copies
= raid10_copies
;
1368 /* Assume there are no metadata devices until the drives are parsed */
1369 rs
->md
.persistent
= 0;
1370 rs
->md
.external
= 1;
1372 /* Check, if any invalid ctr arguments have been passed in for the raid level */
1373 return rs_check_for_valid_flags(rs
);
1376 /* Set raid4/5/6 cache size */
1377 static int rs_set_raid456_stripe_cache(struct raid_set
*rs
)
1380 struct r5conf
*conf
;
1381 struct mddev
*mddev
= &rs
->md
;
1382 uint32_t min_stripes
= max(mddev
->chunk_sectors
, mddev
->new_chunk_sectors
) / 2;
1383 uint32_t nr_stripes
= rs
->stripe_cache_entries
;
1385 if (!rt_is_raid456(rs
->raid_type
)) {
1386 rs
->ti
->error
= "Inappropriate raid level; cannot change stripe_cache size";
1390 if (nr_stripes
< min_stripes
) {
1391 DMINFO("Adjusting requested %u stripe cache entries to %u to suit stripe size",
1392 nr_stripes
, min_stripes
);
1393 nr_stripes
= min_stripes
;
1396 conf
= mddev
->private;
1398 rs
->ti
->error
= "Cannot change stripe_cache size on inactive RAID set";
1402 /* Try setting number of stripes in raid456 stripe cache */
1403 if (conf
->min_nr_stripes
!= nr_stripes
) {
1404 r
= raid5_set_cache_size(mddev
, nr_stripes
);
1406 rs
->ti
->error
= "Failed to set raid4/5/6 stripe cache size";
1410 DMINFO("%u stripe cache entries", nr_stripes
);
1416 /* Return # of data stripes as kept in mddev as of @rs (i.e. as of superblock) */
1417 static unsigned int mddev_data_stripes(struct raid_set
*rs
)
1419 return rs
->md
.raid_disks
- rs
->raid_type
->parity_devs
;
1422 /* Return # of data stripes of @rs (i.e. as of ctr) */
1423 static unsigned int rs_data_stripes(struct raid_set
*rs
)
1425 return rs
->raid_disks
- rs
->raid_type
->parity_devs
;
1428 /* Calculate the sectors per device and per array used for @rs */
1429 static int rs_set_dev_and_array_sectors(struct raid_set
*rs
, bool use_mddev
)
1432 unsigned int data_stripes
;
1433 struct mddev
*mddev
= &rs
->md
;
1434 struct md_rdev
*rdev
;
1435 sector_t array_sectors
= rs
->ti
->len
, dev_sectors
= rs
->ti
->len
;
1438 delta_disks
= mddev
->delta_disks
;
1439 data_stripes
= mddev_data_stripes(rs
);
1441 delta_disks
= rs
->delta_disks
;
1442 data_stripes
= rs_data_stripes(rs
);
1445 /* Special raid1 case w/o delta_disks support (yet) */
1446 if (rt_is_raid1(rs
->raid_type
))
1448 else if (rt_is_raid10(rs
->raid_type
)) {
1449 if (rs
->raid10_copies
< 2 ||
1451 rs
->ti
->error
= "Bogus raid10 data copies or delta disks";
1455 dev_sectors
*= rs
->raid10_copies
;
1456 if (sector_div(dev_sectors
, data_stripes
))
1459 array_sectors
= (data_stripes
+ delta_disks
) * dev_sectors
;
1460 if (sector_div(array_sectors
, rs
->raid10_copies
))
1463 } else if (sector_div(dev_sectors
, data_stripes
))
1467 /* Striped layouts */
1468 array_sectors
= (data_stripes
+ delta_disks
) * dev_sectors
;
1470 rdev_for_each(rdev
, mddev
)
1471 rdev
->sectors
= dev_sectors
;
1473 mddev
->array_sectors
= array_sectors
;
1474 mddev
->dev_sectors
= dev_sectors
;
1478 rs
->ti
->error
= "Target length not divisible by number of data devices";
1482 /* Setup recovery on @rs */
1483 static void __rs_setup_recovery(struct raid_set
*rs
, sector_t dev_sectors
)
1485 /* raid0 does not recover */
1486 if (rs_is_raid0(rs
))
1487 rs
->md
.recovery_cp
= MaxSector
;
1489 * A raid6 set has to be recovered either
1490 * completely or for the grown part to
1491 * ensure proper parity and Q-Syndrome
1493 else if (rs_is_raid6(rs
))
1494 rs
->md
.recovery_cp
= dev_sectors
;
1496 * Other raid set types may skip recovery
1497 * depending on the 'nosync' flag.
1500 rs
->md
.recovery_cp
= test_bit(__CTR_FLAG_NOSYNC
, &rs
->ctr_flags
)
1501 ? MaxSector
: dev_sectors
;
1504 /* Setup recovery on @rs based on raid type, device size and 'nosync' flag */
1505 static void rs_setup_recovery(struct raid_set
*rs
, sector_t dev_sectors
)
1508 /* New raid set or 'sync' flag provided */
1509 __rs_setup_recovery(rs
, 0);
1510 else if (dev_sectors
== MaxSector
)
1511 /* Prevent recovery */
1512 __rs_setup_recovery(rs
, MaxSector
);
1513 else if (rs
->dev
[0].rdev
.sectors
< dev_sectors
)
1514 /* Grown raid set */
1515 __rs_setup_recovery(rs
, rs
->dev
[0].rdev
.sectors
);
1517 __rs_setup_recovery(rs
, MaxSector
);
1520 static void do_table_event(struct work_struct
*ws
)
1522 struct raid_set
*rs
= container_of(ws
, struct raid_set
, md
.event_work
);
1524 smp_rmb(); /* Make sure we access most actual mddev properties */
1525 if (!rs_is_reshaping(rs
))
1526 rs_set_capacity(rs
);
1527 dm_table_event(rs
->ti
->table
);
1530 static int raid_is_congested(struct dm_target_callbacks
*cb
, int bits
)
1532 struct raid_set
*rs
= container_of(cb
, struct raid_set
, callbacks
);
1534 return mddev_congested(&rs
->md
, bits
);
1538 * Make sure a valid takover (level switch) is being requested on @rs
1540 * Conversions of raid sets from one MD personality to another
1541 * have to conform to restrictions which are enforced here.
1543 static int rs_check_takeover(struct raid_set
*rs
)
1545 struct mddev
*mddev
= &rs
->md
;
1546 unsigned int near_copies
;
1548 if (rs
->md
.degraded
) {
1549 rs
->ti
->error
= "Can't takeover degraded raid set";
1553 if (rs_is_reshaping(rs
)) {
1554 rs
->ti
->error
= "Can't takeover reshaping raid set";
1558 switch (mddev
->level
) {
1560 /* raid0 -> raid1/5 with one disk */
1561 if ((mddev
->new_level
== 1 || mddev
->new_level
== 5) &&
1562 mddev
->raid_disks
== 1)
1565 /* raid0 -> raid10 */
1566 if (mddev
->new_level
== 10 &&
1567 !(rs
->raid_disks
% mddev
->raid_disks
))
1570 /* raid0 with multiple disks -> raid4/5/6 */
1571 if (__within_range(mddev
->new_level
, 4, 6) &&
1572 mddev
->new_layout
== ALGORITHM_PARITY_N
&&
1573 mddev
->raid_disks
> 1)
1579 /* Can't takeover raid10_offset! */
1580 if (__is_raid10_offset(mddev
->layout
))
1583 near_copies
= __raid10_near_copies(mddev
->layout
);
1585 /* raid10* -> raid0 */
1586 if (mddev
->new_level
== 0) {
1587 /* Can takeover raid10_near with raid disks divisable by data copies! */
1588 if (near_copies
> 1 &&
1589 !(mddev
->raid_disks
% near_copies
)) {
1590 mddev
->raid_disks
/= near_copies
;
1591 mddev
->delta_disks
= mddev
->raid_disks
;
1595 /* Can takeover raid10_far */
1596 if (near_copies
== 1 &&
1597 __raid10_far_copies(mddev
->layout
) > 1)
1603 /* raid10_{near,far} -> raid1 */
1604 if (mddev
->new_level
== 1 &&
1605 max(near_copies
, __raid10_far_copies(mddev
->layout
)) == mddev
->raid_disks
)
1608 /* raid10_{near,far} with 2 disks -> raid4/5 */
1609 if (__within_range(mddev
->new_level
, 4, 5) &&
1610 mddev
->raid_disks
== 2)
1615 /* raid1 with 2 disks -> raid4/5 */
1616 if (__within_range(mddev
->new_level
, 4, 5) &&
1617 mddev
->raid_disks
== 2) {
1618 mddev
->degraded
= 1;
1622 /* raid1 -> raid0 */
1623 if (mddev
->new_level
== 0 &&
1624 mddev
->raid_disks
== 1)
1627 /* raid1 -> raid10 */
1628 if (mddev
->new_level
== 10)
1633 /* raid4 -> raid0 */
1634 if (mddev
->new_level
== 0)
1637 /* raid4 -> raid1/5 with 2 disks */
1638 if ((mddev
->new_level
== 1 || mddev
->new_level
== 5) &&
1639 mddev
->raid_disks
== 2)
1642 /* raid4 -> raid5/6 with parity N */
1643 if (__within_range(mddev
->new_level
, 5, 6) &&
1644 mddev
->layout
== ALGORITHM_PARITY_N
)
1649 /* raid5 with parity N -> raid0 */
1650 if (mddev
->new_level
== 0 &&
1651 mddev
->layout
== ALGORITHM_PARITY_N
)
1654 /* raid5 with parity N -> raid4 */
1655 if (mddev
->new_level
== 4 &&
1656 mddev
->layout
== ALGORITHM_PARITY_N
)
1659 /* raid5 with 2 disks -> raid1/4/10 */
1660 if ((mddev
->new_level
== 1 || mddev
->new_level
== 4 || mddev
->new_level
== 10) &&
1661 mddev
->raid_disks
== 2)
1664 /* raid5_* -> raid6_*_6 with Q-Syndrome N (e.g. raid5_ra -> raid6_ra_6 */
1665 if (mddev
->new_level
== 6 &&
1666 ((mddev
->layout
== ALGORITHM_PARITY_N
&& mddev
->new_layout
== ALGORITHM_PARITY_N
) ||
1667 __within_range(mddev
->new_layout
, ALGORITHM_LEFT_ASYMMETRIC_6
, ALGORITHM_RIGHT_SYMMETRIC_6
)))
1672 /* raid6 with parity N -> raid0 */
1673 if (mddev
->new_level
== 0 &&
1674 mddev
->layout
== ALGORITHM_PARITY_N
)
1677 /* raid6 with parity N -> raid4 */
1678 if (mddev
->new_level
== 4 &&
1679 mddev
->layout
== ALGORITHM_PARITY_N
)
1682 /* raid6_*_n with Q-Syndrome N -> raid5_* */
1683 if (mddev
->new_level
== 5 &&
1684 ((mddev
->layout
== ALGORITHM_PARITY_N
&& mddev
->new_layout
== ALGORITHM_PARITY_N
) ||
1685 __within_range(mddev
->new_layout
, ALGORITHM_LEFT_ASYMMETRIC
, ALGORITHM_RIGHT_SYMMETRIC
)))
1692 rs
->ti
->error
= "takeover not possible";
1696 /* True if @rs requested to be taken over */
1697 static bool rs_takeover_requested(struct raid_set
*rs
)
1699 return rs
->md
.new_level
!= rs
->md
.level
;
1702 /* True if @rs is requested to reshape by ctr */
1703 static bool rs_reshape_requested(struct raid_set
*rs
)
1706 struct mddev
*mddev
= &rs
->md
;
1708 if (rs_takeover_requested(rs
))
1714 change
= mddev
->new_layout
!= mddev
->layout
||
1715 mddev
->new_chunk_sectors
!= mddev
->chunk_sectors
||
1718 /* Historical case to support raid1 reshape without delta disks */
1719 if (mddev
->level
== 1) {
1720 if (rs
->delta_disks
)
1721 return !!rs
->delta_disks
;
1724 mddev
->raid_disks
!= rs
->raid_disks
;
1727 if (mddev
->level
== 10)
1729 !__is_raid10_far(mddev
->new_layout
) &&
1730 rs
->delta_disks
>= 0;
1736 #define FEATURE_FLAG_SUPPORTS_V190 0x1 /* Supports extended superblock */
1738 /* State flags for sb->flags */
1739 #define SB_FLAG_RESHAPE_ACTIVE 0x1
1740 #define SB_FLAG_RESHAPE_BACKWARDS 0x2
1743 * This structure is never routinely used by userspace, unlike md superblocks.
1744 * Devices with this superblock should only ever be accessed via device-mapper.
1746 #define DM_RAID_MAGIC 0x64526D44
1747 struct dm_raid_superblock
{
1748 __le32 magic
; /* "DmRd" */
1749 __le32 compat_features
; /* Used to indicate compatible features (like 1.9.0 ondisk metadata extension) */
1751 __le32 num_devices
; /* Number of devices in this raid set. (Max 64) */
1752 __le32 array_position
; /* The position of this drive in the raid set */
1754 __le64 events
; /* Incremented by md when superblock updated */
1755 __le64 failed_devices
; /* Pre 1.9.0 part of bit field of devices to */
1756 /* indicate failures (see extension below) */
1759 * This offset tracks the progress of the repair or replacement of
1760 * an individual drive.
1762 __le64 disk_recovery_offset
;
1765 * This offset tracks the progress of the initial raid set
1766 * synchronisation/parity calculation.
1768 __le64 array_resync_offset
;
1771 * raid characteristics
1775 __le32 stripe_sectors
;
1777 /********************************************************************
1778 * BELOW FOLLOW V1.9.0 EXTENSIONS TO THE PRISTINE SUPERBLOCK FORMAT!!!
1780 * FEATURE_FLAG_SUPPORTS_V190 in the features member indicates that those exist
1783 __le32 flags
; /* Flags defining array states for reshaping */
1786 * This offset tracks the progress of a raid
1787 * set reshape in order to be able to restart it
1789 __le64 reshape_position
;
1792 * These define the properties of the array in case of an interrupted reshape
1796 __le32 new_stripe_sectors
;
1799 __le64 array_sectors
; /* Array size in sectors */
1802 * Sector offsets to data on devices (reshaping).
1803 * Needed to support out of place reshaping, thus
1804 * not writing over any stripes whilst converting
1805 * them from old to new layout
1808 __le64 new_data_offset
;
1810 __le64 sectors
; /* Used device size in sectors */
1813 * Additonal Bit field of devices indicating failures to support
1814 * up to 256 devices with the 1.9.0 on-disk metadata format
1816 __le64 extended_failed_devices
[DISKS_ARRAY_ELEMS
- 1];
1818 __le32 incompat_features
; /* Used to indicate any incompatible features */
1820 /* Always set rest up to logical block size to 0 when writing (see get_metadata_device() below). */
1824 * Check for reshape constraints on raid set @rs:
1826 * - reshape function non-existent
1828 * - ongoing recovery
1831 * Returns 0 if none or -EPERM if given constraint
1832 * and error message reference in @errmsg
1834 static int rs_check_reshape(struct raid_set
*rs
)
1836 struct mddev
*mddev
= &rs
->md
;
1838 if (!mddev
->pers
|| !mddev
->pers
->check_reshape
)
1839 rs
->ti
->error
= "Reshape not supported";
1840 else if (mddev
->degraded
)
1841 rs
->ti
->error
= "Can't reshape degraded raid set";
1842 else if (rs_is_recovering(rs
))
1843 rs
->ti
->error
= "Convert request on recovering raid set prohibited";
1844 else if (rs_is_reshaping(rs
))
1845 rs
->ti
->error
= "raid set already reshaping!";
1846 else if (!(rs_is_raid1(rs
) || rs_is_raid10(rs
) || rs_is_raid456(rs
)))
1847 rs
->ti
->error
= "Reshaping only supported for raid1/4/5/6/10";
1854 static int read_disk_sb(struct md_rdev
*rdev
, int size
)
1856 BUG_ON(!rdev
->sb_page
);
1858 if (rdev
->sb_loaded
)
1861 if (!sync_page_io(rdev
, 0, size
, rdev
->sb_page
, REQ_OP_READ
, 0, true)) {
1862 DMERR("Failed to read superblock of device at position %d",
1864 md_error(rdev
->mddev
, rdev
);
1868 rdev
->sb_loaded
= 1;
1873 static void sb_retrieve_failed_devices(struct dm_raid_superblock
*sb
, uint64_t *failed_devices
)
1875 failed_devices
[0] = le64_to_cpu(sb
->failed_devices
);
1876 memset(failed_devices
+ 1, 0, sizeof(sb
->extended_failed_devices
));
1878 if (le32_to_cpu(sb
->compat_features
) & FEATURE_FLAG_SUPPORTS_V190
) {
1879 int i
= ARRAY_SIZE(sb
->extended_failed_devices
);
1882 failed_devices
[i
+1] = le64_to_cpu(sb
->extended_failed_devices
[i
]);
1886 static void sb_update_failed_devices(struct dm_raid_superblock
*sb
, uint64_t *failed_devices
)
1888 int i
= ARRAY_SIZE(sb
->extended_failed_devices
);
1890 sb
->failed_devices
= cpu_to_le64(failed_devices
[0]);
1892 sb
->extended_failed_devices
[i
] = cpu_to_le64(failed_devices
[i
+1]);
1896 * Synchronize the superblock members with the raid set properties
1898 * All superblock data is little endian.
1900 static void super_sync(struct mddev
*mddev
, struct md_rdev
*rdev
)
1902 bool update_failed_devices
= false;
1904 uint64_t failed_devices
[DISKS_ARRAY_ELEMS
];
1905 struct dm_raid_superblock
*sb
;
1906 struct raid_set
*rs
= container_of(mddev
, struct raid_set
, md
);
1908 /* No metadata device, no superblock */
1909 if (!rdev
->meta_bdev
)
1912 BUG_ON(!rdev
->sb_page
);
1914 sb
= page_address(rdev
->sb_page
);
1916 sb_retrieve_failed_devices(sb
, failed_devices
);
1918 for (i
= 0; i
< rs
->raid_disks
; i
++)
1919 if (!rs
->dev
[i
].data_dev
|| test_bit(Faulty
, &rs
->dev
[i
].rdev
.flags
)) {
1920 update_failed_devices
= true;
1921 set_bit(i
, (void *) failed_devices
);
1924 if (update_failed_devices
)
1925 sb_update_failed_devices(sb
, failed_devices
);
1927 sb
->magic
= cpu_to_le32(DM_RAID_MAGIC
);
1928 sb
->compat_features
= cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190
);
1930 sb
->num_devices
= cpu_to_le32(mddev
->raid_disks
);
1931 sb
->array_position
= cpu_to_le32(rdev
->raid_disk
);
1933 sb
->events
= cpu_to_le64(mddev
->events
);
1935 sb
->disk_recovery_offset
= cpu_to_le64(rdev
->recovery_offset
);
1936 sb
->array_resync_offset
= cpu_to_le64(mddev
->recovery_cp
);
1938 sb
->level
= cpu_to_le32(mddev
->level
);
1939 sb
->layout
= cpu_to_le32(mddev
->layout
);
1940 sb
->stripe_sectors
= cpu_to_le32(mddev
->chunk_sectors
);
1942 sb
->new_level
= cpu_to_le32(mddev
->new_level
);
1943 sb
->new_layout
= cpu_to_le32(mddev
->new_layout
);
1944 sb
->new_stripe_sectors
= cpu_to_le32(mddev
->new_chunk_sectors
);
1946 sb
->delta_disks
= cpu_to_le32(mddev
->delta_disks
);
1948 smp_rmb(); /* Make sure we access most recent reshape position */
1949 sb
->reshape_position
= cpu_to_le64(mddev
->reshape_position
);
1950 if (le64_to_cpu(sb
->reshape_position
) != MaxSector
) {
1951 /* Flag ongoing reshape */
1952 sb
->flags
|= cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE
);
1954 if (mddev
->delta_disks
< 0 || mddev
->reshape_backwards
)
1955 sb
->flags
|= cpu_to_le32(SB_FLAG_RESHAPE_BACKWARDS
);
1957 /* Clear reshape flags */
1958 sb
->flags
&= ~(cpu_to_le32(SB_FLAG_RESHAPE_ACTIVE
|SB_FLAG_RESHAPE_BACKWARDS
));
1961 sb
->array_sectors
= cpu_to_le64(mddev
->array_sectors
);
1962 sb
->data_offset
= cpu_to_le64(rdev
->data_offset
);
1963 sb
->new_data_offset
= cpu_to_le64(rdev
->new_data_offset
);
1964 sb
->sectors
= cpu_to_le64(rdev
->sectors
);
1965 sb
->incompat_features
= cpu_to_le32(0);
1967 /* Zero out the rest of the payload after the size of the superblock */
1968 memset(sb
+ 1, 0, rdev
->sb_size
- sizeof(*sb
));
1974 * This function creates a superblock if one is not found on the device
1975 * and will decide which superblock to use if there's a choice.
1977 * Return: 1 if use rdev, 0 if use refdev, -Exxx otherwise
1979 static int super_load(struct md_rdev
*rdev
, struct md_rdev
*refdev
)
1982 struct dm_raid_superblock
*sb
;
1983 struct dm_raid_superblock
*refsb
;
1984 uint64_t events_sb
, events_refsb
;
1987 rdev
->sb_size
= bdev_logical_block_size(rdev
->meta_bdev
);
1988 if (rdev
->sb_size
< sizeof(*sb
) || rdev
->sb_size
> PAGE_SIZE
) {
1989 DMERR("superblock size of a logical block is no longer valid");
1993 r
= read_disk_sb(rdev
, rdev
->sb_size
);
1997 sb
= page_address(rdev
->sb_page
);
2000 * Two cases that we want to write new superblocks and rebuild:
2001 * 1) New device (no matching magic number)
2002 * 2) Device specified for rebuild (!In_sync w/ offset == 0)
2004 if ((sb
->magic
!= cpu_to_le32(DM_RAID_MAGIC
)) ||
2005 (!test_bit(In_sync
, &rdev
->flags
) && !rdev
->recovery_offset
)) {
2006 super_sync(rdev
->mddev
, rdev
);
2008 set_bit(FirstUse
, &rdev
->flags
);
2009 sb
->compat_features
= cpu_to_le32(FEATURE_FLAG_SUPPORTS_V190
);
2011 /* Force writing of superblocks to disk */
2012 set_bit(MD_SB_CHANGE_DEVS
, &rdev
->mddev
->sb_flags
);
2014 /* Any superblock is better than none, choose that if given */
2015 return refdev
? 0 : 1;
2021 events_sb
= le64_to_cpu(sb
->events
);
2023 refsb
= page_address(refdev
->sb_page
);
2024 events_refsb
= le64_to_cpu(refsb
->events
);
2026 return (events_sb
> events_refsb
) ? 1 : 0;
2029 static int super_init_validation(struct raid_set
*rs
, struct md_rdev
*rdev
)
2033 struct mddev
*mddev
= &rs
->md
;
2035 uint64_t failed_devices
[DISKS_ARRAY_ELEMS
];
2036 struct dm_raid_superblock
*sb
;
2037 uint32_t new_devs
= 0, rebuild_and_new
= 0, rebuilds
= 0;
2039 struct dm_raid_superblock
*sb2
;
2041 sb
= page_address(rdev
->sb_page
);
2042 events_sb
= le64_to_cpu(sb
->events
);
2045 * Initialise to 1 if this is a new superblock.
2047 mddev
->events
= events_sb
? : 1;
2049 mddev
->reshape_position
= MaxSector
;
2051 mddev
->raid_disks
= le32_to_cpu(sb
->num_devices
);
2052 mddev
->level
= le32_to_cpu(sb
->level
);
2053 mddev
->layout
= le32_to_cpu(sb
->layout
);
2054 mddev
->chunk_sectors
= le32_to_cpu(sb
->stripe_sectors
);
2057 * Reshaping is supported, e.g. reshape_position is valid
2058 * in superblock and superblock content is authoritative.
2060 if (le32_to_cpu(sb
->compat_features
) & FEATURE_FLAG_SUPPORTS_V190
) {
2061 /* Superblock is authoritative wrt given raid set layout! */
2062 mddev
->new_level
= le32_to_cpu(sb
->new_level
);
2063 mddev
->new_layout
= le32_to_cpu(sb
->new_layout
);
2064 mddev
->new_chunk_sectors
= le32_to_cpu(sb
->new_stripe_sectors
);
2065 mddev
->delta_disks
= le32_to_cpu(sb
->delta_disks
);
2066 mddev
->array_sectors
= le64_to_cpu(sb
->array_sectors
);
2068 /* raid was reshaping and got interrupted */
2069 if (le32_to_cpu(sb
->flags
) & SB_FLAG_RESHAPE_ACTIVE
) {
2070 if (test_bit(__CTR_FLAG_DELTA_DISKS
, &rs
->ctr_flags
)) {
2071 DMERR("Reshape requested but raid set is still reshaping");
2075 if (mddev
->delta_disks
< 0 ||
2076 (!mddev
->delta_disks
&& (le32_to_cpu(sb
->flags
) & SB_FLAG_RESHAPE_BACKWARDS
)))
2077 mddev
->reshape_backwards
= 1;
2079 mddev
->reshape_backwards
= 0;
2081 mddev
->reshape_position
= le64_to_cpu(sb
->reshape_position
);
2082 rs
->raid_type
= get_raid_type_by_ll(mddev
->level
, mddev
->layout
);
2087 * No takeover/reshaping, because we don't have the extended v1.9.0 metadata
2089 struct raid_type
*rt_cur
= get_raid_type_by_ll(mddev
->level
, mddev
->layout
);
2090 struct raid_type
*rt_new
= get_raid_type_by_ll(mddev
->new_level
, mddev
->new_layout
);
2092 if (rs_takeover_requested(rs
)) {
2093 if (rt_cur
&& rt_new
)
2094 DMERR("Takeover raid sets from %s to %s not yet supported by metadata. (raid level change)",
2095 rt_cur
->name
, rt_new
->name
);
2097 DMERR("Takeover raid sets not yet supported by metadata. (raid level change)");
2099 } else if (rs_reshape_requested(rs
)) {
2100 DMERR("Reshaping raid sets not yet supported by metadata. (raid layout change keeping level)");
2101 if (mddev
->layout
!= mddev
->new_layout
) {
2102 if (rt_cur
&& rt_new
)
2103 DMERR(" current layout %s vs new layout %s",
2104 rt_cur
->name
, rt_new
->name
);
2106 DMERR(" current layout 0x%X vs new layout 0x%X",
2107 le32_to_cpu(sb
->layout
), mddev
->new_layout
);
2109 if (mddev
->chunk_sectors
!= mddev
->new_chunk_sectors
)
2110 DMERR(" current stripe sectors %u vs new stripe sectors %u",
2111 mddev
->chunk_sectors
, mddev
->new_chunk_sectors
);
2112 if (rs
->delta_disks
)
2113 DMERR(" current %u disks vs new %u disks",
2114 mddev
->raid_disks
, mddev
->raid_disks
+ rs
->delta_disks
);
2115 if (rs_is_raid10(rs
)) {
2116 DMERR(" Old layout: %s w/ %u copies",
2117 raid10_md_layout_to_format(mddev
->layout
),
2118 raid10_md_layout_to_copies(mddev
->layout
));
2119 DMERR(" New layout: %s w/ %u copies",
2120 raid10_md_layout_to_format(mddev
->new_layout
),
2121 raid10_md_layout_to_copies(mddev
->new_layout
));
2126 DMINFO("Discovered old metadata format; upgrading to extended metadata format");
2129 if (!test_bit(__CTR_FLAG_NOSYNC
, &rs
->ctr_flags
))
2130 mddev
->recovery_cp
= le64_to_cpu(sb
->array_resync_offset
);
2133 * During load, we set FirstUse if a new superblock was written.
2134 * There are two reasons we might not have a superblock:
2135 * 1) The raid set is brand new - in which case, all of the
2136 * devices must have their In_sync bit set. Also,
2137 * recovery_cp must be 0, unless forced.
2138 * 2) This is a new device being added to an old raid set
2139 * and the new device needs to be rebuilt - in which
2140 * case the In_sync bit will /not/ be set and
2141 * recovery_cp must be MaxSector.
2142 * 3) This is/are a new device(s) being added to an old
2143 * raid set during takeover to a higher raid level
2144 * to provide capacity for redundancy or during reshape
2145 * to add capacity to grow the raid set.
2148 rdev_for_each(r
, mddev
) {
2149 if (test_bit(FirstUse
, &r
->flags
))
2152 if (!test_bit(In_sync
, &r
->flags
)) {
2153 DMINFO("Device %d specified for rebuild; clearing superblock",
2157 if (test_bit(FirstUse
, &r
->flags
))
2164 if (new_devs
== rs
->raid_disks
|| !rebuilds
) {
2165 /* Replace a broken device */
2166 if (new_devs
== 1 && !rs
->delta_disks
)
2168 if (new_devs
== rs
->raid_disks
) {
2169 DMINFO("Superblocks created for new raid set");
2170 set_bit(MD_ARRAY_FIRST_USE
, &mddev
->flags
);
2171 } else if (new_devs
!= rebuilds
&&
2172 new_devs
!= rs
->delta_disks
) {
2173 DMERR("New device injected into existing raid set without "
2174 "'delta_disks' or 'rebuild' parameter specified");
2177 } else if (new_devs
&& new_devs
!= rebuilds
) {
2178 DMERR("%u 'rebuild' devices cannot be injected into"
2179 " a raid set with %u other first-time devices",
2180 rebuilds
, new_devs
);
2182 } else if (rebuilds
) {
2183 if (rebuild_and_new
&& rebuilds
!= rebuild_and_new
) {
2184 DMERR("new device%s provided without 'rebuild'",
2185 new_devs
> 1 ? "s" : "");
2187 } else if (rs_is_recovering(rs
)) {
2188 DMERR("'rebuild' specified while raid set is not in-sync (recovery_cp=%llu)",
2189 (unsigned long long) mddev
->recovery_cp
);
2191 } else if (rs_is_reshaping(rs
)) {
2192 DMERR("'rebuild' specified while raid set is being reshaped (reshape_position=%llu)",
2193 (unsigned long long) mddev
->reshape_position
);
2199 * Now we set the Faulty bit for those devices that are
2200 * recorded in the superblock as failed.
2202 sb_retrieve_failed_devices(sb
, failed_devices
);
2203 rdev_for_each(r
, mddev
) {
2206 sb2
= page_address(r
->sb_page
);
2207 sb2
->failed_devices
= 0;
2208 memset(sb2
->extended_failed_devices
, 0, sizeof(sb2
->extended_failed_devices
));
2211 * Check for any device re-ordering.
2213 if (!test_bit(FirstUse
, &r
->flags
) && (r
->raid_disk
>= 0)) {
2214 role
= le32_to_cpu(sb2
->array_position
);
2218 if (role
!= r
->raid_disk
) {
2219 if (rs_is_raid10(rs
) && __is_raid10_near(mddev
->layout
)) {
2220 if (mddev
->raid_disks
% __raid10_near_copies(mddev
->layout
) ||
2221 rs
->raid_disks
% rs
->raid10_copies
) {
2223 "Cannot change raid10 near set to odd # of devices!";
2227 sb2
->array_position
= cpu_to_le32(r
->raid_disk
);
2229 } else if (!(rs_is_raid10(rs
) && rt_is_raid0(rs
->raid_type
)) &&
2230 !(rs_is_raid0(rs
) && rt_is_raid10(rs
->raid_type
)) &&
2231 !rt_is_raid1(rs
->raid_type
)) {
2232 rs
->ti
->error
= "Cannot change device positions in raid set";
2236 DMINFO("raid device #%d now at position #%d", role
, r
->raid_disk
);
2240 * Partial recovery is performed on
2241 * returning failed devices.
2243 if (test_bit(role
, (void *) failed_devices
))
2244 set_bit(Faulty
, &r
->flags
);
2251 static int super_validate(struct raid_set
*rs
, struct md_rdev
*rdev
)
2253 struct mddev
*mddev
= &rs
->md
;
2254 struct dm_raid_superblock
*sb
;
2256 if (rs_is_raid0(rs
) || !rdev
->sb_page
|| rdev
->raid_disk
< 0)
2259 sb
= page_address(rdev
->sb_page
);
2262 * If mddev->events is not set, we know we have not yet initialized
2265 if (!mddev
->events
&& super_init_validation(rs
, rdev
))
2268 if (le32_to_cpu(sb
->compat_features
) &&
2269 le32_to_cpu(sb
->compat_features
) != FEATURE_FLAG_SUPPORTS_V190
) {
2270 rs
->ti
->error
= "Unable to assemble array: Unknown flag(s) in compatible feature flags";
2274 if (sb
->incompat_features
) {
2275 rs
->ti
->error
= "Unable to assemble array: No incompatible feature flags supported yet";
2279 /* Enable bitmap creation for RAID levels != 0 */
2280 mddev
->bitmap_info
.offset
= rt_is_raid0(rs
->raid_type
) ? 0 : to_sector(4096);
2281 rdev
->mddev
->bitmap_info
.default_offset
= mddev
->bitmap_info
.offset
;
2283 if (!test_and_clear_bit(FirstUse
, &rdev
->flags
)) {
2284 /* Retrieve device size stored in superblock to be prepared for shrink */
2285 rdev
->sectors
= le64_to_cpu(sb
->sectors
);
2286 rdev
->recovery_offset
= le64_to_cpu(sb
->disk_recovery_offset
);
2287 if (rdev
->recovery_offset
== MaxSector
)
2288 set_bit(In_sync
, &rdev
->flags
);
2290 * If no reshape in progress -> we're recovering single
2291 * disk(s) and have to set the device(s) to out-of-sync
2293 else if (!rs_is_reshaping(rs
))
2294 clear_bit(In_sync
, &rdev
->flags
); /* Mandatory for recovery */
2298 * If a device comes back, set it as not In_sync and no longer faulty.
2300 if (test_and_clear_bit(Faulty
, &rdev
->flags
)) {
2301 rdev
->recovery_offset
= 0;
2302 clear_bit(In_sync
, &rdev
->flags
);
2303 rdev
->saved_raid_disk
= rdev
->raid_disk
;
2306 /* Reshape support -> restore repective data offsets */
2307 rdev
->data_offset
= le64_to_cpu(sb
->data_offset
);
2308 rdev
->new_data_offset
= le64_to_cpu(sb
->new_data_offset
);
2314 * Analyse superblocks and select the freshest.
2316 static int analyse_superblocks(struct dm_target
*ti
, struct raid_set
*rs
)
2319 struct md_rdev
*rdev
, *freshest
;
2320 struct mddev
*mddev
= &rs
->md
;
2323 rdev_for_each(rdev
, mddev
) {
2325 * Skipping super_load due to CTR_FLAG_SYNC will cause
2326 * the array to undergo initialization again as
2327 * though it were new. This is the intended effect
2328 * of the "sync" directive.
2330 * With reshaping capability added, we must ensure that
2331 * that the "sync" directive is disallowed during the reshape.
2333 if (test_bit(__CTR_FLAG_SYNC
, &rs
->ctr_flags
))
2336 if (!rdev
->meta_bdev
)
2339 r
= super_load(rdev
, freshest
);
2348 /* This is a failure to read the superblock from the metadata device. */
2350 * We have to keep any raid0 data/metadata device pairs or
2351 * the MD raid0 personality will fail to start the array.
2353 if (rs_is_raid0(rs
))
2357 * We keep the dm_devs to be able to emit the device tuple
2358 * properly on the table line in raid_status() (rather than
2359 * mistakenly acting as if '- -' got passed into the constructor).
2361 * The rdev has to stay on the same_set list to allow for
2362 * the attempt to restore faulty devices on second resume.
2364 set_bit(Faulty
, &rdev
->flags
);
2365 rdev
->raid_disk
= rdev
->saved_raid_disk
= -1;
2373 if (validate_raid_redundancy(rs
)) {
2374 rs
->ti
->error
= "Insufficient redundancy to activate array";
2379 * Validation of the freshest device provides the source of
2380 * validation for the remaining devices.
2382 rs
->ti
->error
= "Unable to assemble array: Invalid superblocks";
2383 if (super_validate(rs
, freshest
))
2386 rdev_for_each(rdev
, mddev
)
2387 if ((rdev
!= freshest
) && super_validate(rs
, rdev
))
2393 * Adjust data_offset and new_data_offset on all disk members of @rs
2394 * for out of place reshaping if requested by contructor
2396 * We need free space at the beginning of each raid disk for forward
2397 * and at the end for backward reshapes which userspace has to provide
2398 * via remapping/reordering of space.
2400 static int rs_adjust_data_offsets(struct raid_set
*rs
)
2402 sector_t data_offset
= 0, new_data_offset
= 0;
2403 struct md_rdev
*rdev
;
2405 /* Constructor did not request data offset change */
2406 if (!test_bit(__CTR_FLAG_DATA_OFFSET
, &rs
->ctr_flags
)) {
2407 if (!rs_is_reshapable(rs
))
2413 /* HM FIXME: get InSync raid_dev? */
2414 rdev
= &rs
->dev
[0].rdev
;
2416 if (rs
->delta_disks
< 0) {
2418 * Removing disks (reshaping backwards):
2420 * - before reshape: data is at offset 0 and free space
2421 * is at end of each component LV
2423 * - after reshape: data is at offset rs->data_offset != 0 on each component LV
2426 new_data_offset
= rs
->data_offset
;
2428 } else if (rs
->delta_disks
> 0) {
2430 * Adding disks (reshaping forwards):
2432 * - before reshape: data is at offset rs->data_offset != 0 and
2433 * free space is at begin of each component LV
2435 * - after reshape: data is at offset 0 on each component LV
2437 data_offset
= rs
->data_offset
;
2438 new_data_offset
= 0;
2442 * User space passes in 0 for data offset after having removed reshape space
2444 * - or - (data offset != 0)
2446 * Changing RAID layout or chunk size -> toggle offsets
2448 * - before reshape: data is at offset rs->data_offset 0 and
2449 * free space is at end of each component LV
2451 * data is at offset rs->data_offset != 0 and
2452 * free space is at begin of each component LV
2454 * - after reshape: data is at offset 0 if it was at offset != 0
2455 * or at offset != 0 if it was at offset 0
2456 * on each component LV
2459 data_offset
= rs
->data_offset
? rdev
->data_offset
: 0;
2460 new_data_offset
= data_offset
? 0 : rs
->data_offset
;
2461 set_bit(RT_FLAG_UPDATE_SBS
, &rs
->runtime_flags
);
2465 * Make sure we got a minimum amount of free sectors per device
2467 if (rs
->data_offset
&&
2468 to_sector(i_size_read(rdev
->bdev
->bd_inode
)) - rdev
->sectors
< MIN_FREE_RESHAPE_SPACE
) {
2469 rs
->ti
->error
= data_offset
? "No space for forward reshape" :
2470 "No space for backward reshape";
2474 /* Adjust data offsets on all rdevs */
2475 rdev_for_each(rdev
, &rs
->md
) {
2476 rdev
->data_offset
= data_offset
;
2477 rdev
->new_data_offset
= new_data_offset
;
2483 /* Userpace reordered disks -> adjust raid_disk indexes in @rs */
2484 static void __reorder_raid_disk_indexes(struct raid_set
*rs
)
2487 struct md_rdev
*rdev
;
2489 rdev_for_each(rdev
, &rs
->md
) {
2490 rdev
->raid_disk
= i
++;
2491 rdev
->saved_raid_disk
= rdev
->new_raid_disk
= -1;
2496 * Setup @rs for takeover by a different raid level
2498 static int rs_setup_takeover(struct raid_set
*rs
)
2500 struct mddev
*mddev
= &rs
->md
;
2501 struct md_rdev
*rdev
;
2502 unsigned int d
= mddev
->raid_disks
= rs
->raid_disks
;
2503 sector_t new_data_offset
= rs
->dev
[0].rdev
.data_offset
? 0 : rs
->data_offset
;
2505 if (rt_is_raid10(rs
->raid_type
)) {
2506 if (mddev
->level
== 0) {
2507 /* Userpace reordered disks -> adjust raid_disk indexes */
2508 __reorder_raid_disk_indexes(rs
);
2510 /* raid0 -> raid10_far layout */
2511 mddev
->layout
= raid10_format_to_md_layout(rs
, ALGORITHM_RAID10_FAR
,
2513 } else if (mddev
->level
== 1)
2514 /* raid1 -> raid10_near layout */
2515 mddev
->layout
= raid10_format_to_md_layout(rs
, ALGORITHM_RAID10_NEAR
,
2522 clear_bit(MD_ARRAY_FIRST_USE
, &mddev
->flags
);
2523 mddev
->recovery_cp
= MaxSector
;
2526 rdev
= &rs
->dev
[d
].rdev
;
2528 if (test_bit(d
, (void *) rs
->rebuild_disks
)) {
2529 clear_bit(In_sync
, &rdev
->flags
);
2530 clear_bit(Faulty
, &rdev
->flags
);
2531 mddev
->recovery_cp
= rdev
->recovery_offset
= 0;
2532 /* Bitmap has to be created when we do an "up" takeover */
2533 set_bit(MD_ARRAY_FIRST_USE
, &mddev
->flags
);
2536 rdev
->new_data_offset
= new_data_offset
;
2542 /* Prepare @rs for reshape */
2543 static int rs_prepare_reshape(struct raid_set
*rs
)
2546 struct mddev
*mddev
= &rs
->md
;
2548 if (rs_is_raid10(rs
)) {
2549 if (rs
->raid_disks
!= mddev
->raid_disks
&&
2550 __is_raid10_near(mddev
->layout
) &&
2551 rs
->raid10_copies
&&
2552 rs
->raid10_copies
!= __raid10_near_copies(mddev
->layout
)) {
2554 * raid disk have to be multiple of data copies to allow this conversion,
2556 * This is actually not a reshape it is a
2557 * rebuild of any additional mirrors per group
2559 if (rs
->raid_disks
% rs
->raid10_copies
) {
2560 rs
->ti
->error
= "Can't reshape raid10 mirror groups";
2564 /* Userpace reordered disks to add/remove mirrors -> adjust raid_disk indexes */
2565 __reorder_raid_disk_indexes(rs
);
2566 mddev
->layout
= raid10_format_to_md_layout(rs
, ALGORITHM_RAID10_NEAR
,
2568 mddev
->new_layout
= mddev
->layout
;
2573 } else if (rs_is_raid456(rs
))
2576 else if (rs_is_raid1(rs
)) {
2577 if (rs
->delta_disks
) {
2578 /* Process raid1 via delta_disks */
2579 mddev
->degraded
= rs
->delta_disks
< 0 ? -rs
->delta_disks
: rs
->delta_disks
;
2582 /* Process raid1 without delta_disks */
2583 mddev
->raid_disks
= rs
->raid_disks
;
2587 rs
->ti
->error
= "Called with bogus raid type";
2592 set_bit(RT_FLAG_RESHAPE_RS
, &rs
->runtime_flags
);
2593 set_bit(RT_FLAG_UPDATE_SBS
, &rs
->runtime_flags
);
2594 } else if (mddev
->raid_disks
< rs
->raid_disks
)
2595 /* Create new superblocks and bitmaps, if any new disks */
2596 set_bit(RT_FLAG_UPDATE_SBS
, &rs
->runtime_flags
);
2603 * - change raid layout
2604 * - change chunk size
2608 static int rs_setup_reshape(struct raid_set
*rs
)
2611 unsigned int cur_raid_devs
, d
;
2612 struct mddev
*mddev
= &rs
->md
;
2613 struct md_rdev
*rdev
;
2615 mddev
->delta_disks
= rs
->delta_disks
;
2616 cur_raid_devs
= mddev
->raid_disks
;
2618 /* Ignore impossible layout change whilst adding/removing disks */
2619 if (mddev
->delta_disks
&&
2620 mddev
->layout
!= mddev
->new_layout
) {
2621 DMINFO("Ignoring invalid layout change with delta_disks=%d", rs
->delta_disks
);
2622 mddev
->new_layout
= mddev
->layout
;
2626 * Adjust array size:
2628 * - in case of adding disks, array size has
2629 * to grow after the disk adding reshape,
2630 * which'll hapen in the event handler;
2631 * reshape will happen forward, so space has to
2632 * be available at the beginning of each disk
2634 * - in case of removing disks, array size
2635 * has to shrink before starting the reshape,
2636 * which'll happen here;
2637 * reshape will happen backward, so space has to
2638 * be available at the end of each disk
2640 * - data_offset and new_data_offset are
2641 * adjusted for aforementioned out of place
2642 * reshaping based on userspace passing in
2643 * the "data_offset <sectors>" key/value
2644 * pair via the constructor
2648 if (rs
->delta_disks
> 0) {
2649 /* Prepare disks for check in raid4/5/6/10 {check|start}_reshape */
2650 for (d
= cur_raid_devs
; d
< rs
->raid_disks
; d
++) {
2651 rdev
= &rs
->dev
[d
].rdev
;
2652 clear_bit(In_sync
, &rdev
->flags
);
2655 * save_raid_disk needs to be -1, or recovery_offset will be set to 0
2656 * by md, which'll store that erroneously in the superblock on reshape
2658 rdev
->saved_raid_disk
= -1;
2659 rdev
->raid_disk
= d
;
2661 rdev
->sectors
= mddev
->dev_sectors
;
2662 rdev
->recovery_offset
= rs_is_raid1(rs
) ? 0 : MaxSector
;
2665 mddev
->reshape_backwards
= 0; /* adding disks -> forward reshape */
2667 /* Remove disk(s) */
2668 } else if (rs
->delta_disks
< 0) {
2669 r
= rs_set_dev_and_array_sectors(rs
, true);
2670 mddev
->reshape_backwards
= 1; /* removing disk(s) -> backward reshape */
2672 /* Change layout and/or chunk size */
2675 * Reshape layout (e.g. raid5_ls -> raid5_n) and/or chunk size:
2677 * keeping number of disks and do layout change ->
2679 * toggle reshape_backward depending on data_offset:
2681 * - free space upfront -> reshape forward
2683 * - free space at the end -> reshape backward
2686 * This utilizes free reshape space avoiding the need
2687 * for userspace to move (parts of) LV segments in
2688 * case of layout/chunksize change (for disk
2689 * adding/removing reshape space has to be at
2690 * the proper address (see above with delta_disks):
2692 * add disk(s) -> begin
2693 * remove disk(s)-> end
2695 mddev
->reshape_backwards
= rs
->dev
[0].rdev
.data_offset
? 0 : 1;
2702 * Enable/disable discard support on RAID set depending on
2703 * RAID level and discard properties of underlying RAID members.
2705 static void configure_discard_support(struct raid_set
*rs
)
2709 struct dm_target
*ti
= rs
->ti
;
2711 /* Assume discards not supported until after checks below. */
2712 ti
->discards_supported
= false;
2714 /* RAID level 4,5,6 require discard_zeroes_data for data integrity! */
2715 raid456
= (rs
->md
.level
== 4 || rs
->md
.level
== 5 || rs
->md
.level
== 6);
2717 for (i
= 0; i
< rs
->raid_disks
; i
++) {
2718 struct request_queue
*q
;
2720 if (!rs
->dev
[i
].rdev
.bdev
)
2723 q
= bdev_get_queue(rs
->dev
[i
].rdev
.bdev
);
2724 if (!q
|| !blk_queue_discard(q
))
2728 if (!q
->limits
.discard_zeroes_data
)
2730 if (!devices_handle_discard_safely
) {
2731 DMERR("raid456 discard support disabled due to discard_zeroes_data uncertainty.");
2732 DMERR("Set dm-raid.devices_handle_discard_safely=Y to override.");
2738 /* All RAID members properly support discards */
2739 ti
->discards_supported
= true;
2742 * RAID1 and RAID10 personalities require bio splitting,
2743 * RAID0/4/5/6 don't and process large discard bios properly.
2745 ti
->split_discard_bios
= !!(rs
->md
.level
== 1 || rs
->md
.level
== 10);
2746 ti
->num_discard_bios
= 1;
2750 * Construct a RAID0/1/10/4/5/6 mapping:
2752 * <raid_type> <#raid_params> <raid_params>{0,} \
2753 * <#raid_devs> [<meta_dev1> <dev1>]{1,}
2755 * <raid_params> varies by <raid_type>. See 'parse_raid_params' for
2756 * details on possible <raid_params>.
2758 * Userspace is free to initialize the metadata devices, hence the superblocks to
2759 * enforce recreation based on the passed in table parameters.
2762 static int raid_ctr(struct dm_target
*ti
, unsigned int argc
, char **argv
)
2766 struct raid_type
*rt
;
2767 unsigned int num_raid_params
, num_raid_devs
;
2768 sector_t calculated_dev_sectors
;
2769 struct raid_set
*rs
= NULL
;
2771 struct rs_layout rs_layout
;
2772 struct dm_arg_set as
= { argc
, argv
}, as_nrd
;
2773 struct dm_arg _args
[] = {
2774 { 0, as
.argc
, "Cannot understand number of raid parameters" },
2775 { 1, 254, "Cannot understand number of raid devices parameters" }
2778 /* Must have <raid_type> */
2779 arg
= dm_shift_arg(&as
);
2781 ti
->error
= "No arguments";
2785 rt
= get_raid_type(arg
);
2787 ti
->error
= "Unrecognised raid_type";
2791 /* Must have <#raid_params> */
2792 if (dm_read_arg_group(_args
, &as
, &num_raid_params
, &ti
->error
))
2795 /* number of raid device tupples <meta_dev data_dev> */
2797 dm_consume_args(&as_nrd
, num_raid_params
);
2798 _args
[1].max
= (as_nrd
.argc
- 1) / 2;
2799 if (dm_read_arg(_args
+ 1, &as_nrd
, &num_raid_devs
, &ti
->error
))
2802 if (!__within_range(num_raid_devs
, 1, MAX_RAID_DEVICES
)) {
2803 ti
->error
= "Invalid number of supplied raid devices";
2807 rs
= raid_set_alloc(ti
, rt
, num_raid_devs
);
2811 r
= parse_raid_params(rs
, &as
, num_raid_params
);
2815 r
= parse_dev_params(rs
, &as
);
2819 rs
->md
.sync_super
= super_sync
;
2822 * Calculate ctr requested array and device sizes to allow
2823 * for superblock analysis needing device sizes defined.
2825 * Any existing superblock will overwrite the array and device sizes
2827 r
= rs_set_dev_and_array_sectors(rs
, false);
2831 calculated_dev_sectors
= rs
->dev
[0].rdev
.sectors
;
2834 * Backup any new raid set level, layout, ...
2835 * requested to be able to compare to superblock
2836 * members for conversion decisions.
2838 rs_config_backup(rs
, &rs_layout
);
2840 r
= analyse_superblocks(ti
, rs
);
2844 resize
= calculated_dev_sectors
!= rs
->dev
[0].rdev
.sectors
;
2846 INIT_WORK(&rs
->md
.event_work
, do_table_event
);
2848 ti
->num_flush_bios
= 1;
2850 /* Restore any requested new layout for conversion decision */
2851 rs_config_restore(rs
, &rs_layout
);
2854 * Now that we have any superblock metadata available,
2855 * check for new, recovering, reshaping, to be taken over,
2856 * to be reshaped or an existing, unchanged raid set to
2859 if (test_bit(MD_ARRAY_FIRST_USE
, &rs
->md
.flags
)) {
2860 /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */
2861 if (rs_is_raid6(rs
) &&
2862 test_bit(__CTR_FLAG_NOSYNC
, &rs
->ctr_flags
)) {
2863 ti
->error
= "'nosync' not allowed for new raid6 set";
2867 rs_setup_recovery(rs
, 0);
2868 set_bit(RT_FLAG_UPDATE_SBS
, &rs
->runtime_flags
);
2870 } else if (rs_is_recovering(rs
)) {
2871 /* A recovering raid set may be resized */
2872 ; /* skip setup rs */
2873 } else if (rs_is_reshaping(rs
)) {
2874 /* Have to reject size change request during reshape */
2876 ti
->error
= "Can't resize a reshaping raid set";
2881 } else if (rs_takeover_requested(rs
)) {
2882 if (rs_is_reshaping(rs
)) {
2883 ti
->error
= "Can't takeover a reshaping raid set";
2889 * If a takeover is needed, userspace sets any additional
2890 * devices to rebuild and we can check for a valid request here.
2892 * If acceptible, set the level to the new requested
2893 * one, prohibit requesting recovery, allow the raid
2894 * set to run and store superblocks during resume.
2896 r
= rs_check_takeover(rs
);
2900 r
= rs_setup_takeover(rs
);
2904 set_bit(RT_FLAG_UPDATE_SBS
, &rs
->runtime_flags
);
2905 /* Takeover ain't recovery, so disable recovery */
2906 rs_setup_recovery(rs
, MaxSector
);
2908 } else if (rs_reshape_requested(rs
)) {
2910 * We can only prepare for a reshape here, because the
2911 * raid set needs to run to provide the repective reshape
2912 * check functions via its MD personality instance.
2914 * So do the reshape check after md_run() succeeded.
2916 r
= rs_prepare_reshape(rs
);
2920 /* Reshaping ain't recovery, so disable recovery */
2921 rs_setup_recovery(rs
, MaxSector
);
2924 /* May not set recovery when a device rebuild is requested */
2925 if (test_bit(__CTR_FLAG_REBUILD
, &rs
->ctr_flags
)) {
2926 rs_setup_recovery(rs
, MaxSector
);
2927 set_bit(RT_FLAG_UPDATE_SBS
, &rs
->runtime_flags
);
2929 rs_setup_recovery(rs
, test_bit(__CTR_FLAG_SYNC
, &rs
->ctr_flags
) ?
2930 0 : (resize
? calculated_dev_sectors
: MaxSector
));
2934 /* If constructor requested it, change data and new_data offsets */
2935 r
= rs_adjust_data_offsets(rs
);
2939 /* Start raid set read-only and assumed clean to change in raid_resume() */
2942 set_bit(MD_RECOVERY_FROZEN
, &rs
->md
.recovery
);
2944 /* Has to be held on running the array */
2945 mddev_lock_nointr(&rs
->md
);
2946 r
= md_run(&rs
->md
);
2947 rs
->md
.in_sync
= 0; /* Assume already marked dirty */
2950 ti
->error
= "Failed to run raid array";
2951 mddev_unlock(&rs
->md
);
2955 rs
->callbacks
.congested_fn
= raid_is_congested
;
2956 dm_table_add_target_callbacks(ti
->table
, &rs
->callbacks
);
2958 mddev_suspend(&rs
->md
);
2960 /* Try to adjust the raid4/5/6 stripe cache size to the stripe size */
2961 if (rs_is_raid456(rs
)) {
2962 r
= rs_set_raid456_stripe_cache(rs
);
2964 goto bad_stripe_cache
;
2967 /* Now do an early reshape check */
2968 if (test_bit(RT_FLAG_RESHAPE_RS
, &rs
->runtime_flags
)) {
2969 r
= rs_check_reshape(rs
);
2971 goto bad_check_reshape
;
2973 /* Restore new, ctr requested layout to perform check */
2974 rs_config_restore(rs
, &rs_layout
);
2976 if (rs
->md
.pers
->start_reshape
) {
2977 r
= rs
->md
.pers
->check_reshape(&rs
->md
);
2979 ti
->error
= "Reshape check failed";
2980 goto bad_check_reshape
;
2985 /* Disable/enable discard support on raid set. */
2986 configure_discard_support(rs
);
2988 mddev_unlock(&rs
->md
);
3000 static void raid_dtr(struct dm_target
*ti
)
3002 struct raid_set
*rs
= ti
->private;
3004 list_del_init(&rs
->callbacks
.list
);
3009 static int raid_map(struct dm_target
*ti
, struct bio
*bio
)
3011 struct raid_set
*rs
= ti
->private;
3012 struct mddev
*mddev
= &rs
->md
;
3015 * If we're reshaping to add disk(s)), ti->len and
3016 * mddev->array_sectors will differ during the process
3017 * (ti->len > mddev->array_sectors), so we have to requeue
3018 * bios with addresses > mddev->array_sectors here or
3019 * there will occur accesses past EOD of the component
3020 * data images thus erroring the raid set.
3022 if (unlikely(bio_end_sector(bio
) > mddev
->array_sectors
))
3023 return DM_MAPIO_REQUEUE
;
3025 mddev
->pers
->make_request(mddev
, bio
);
3027 return DM_MAPIO_SUBMITTED
;
3030 /* Return string describing the current sync action of @mddev */
3031 static const char *decipher_sync_action(struct mddev
*mddev
)
3033 if (test_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
))
3036 if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3037 (!mddev
->ro
&& test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))) {
3038 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
))
3041 if (test_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
)) {
3042 if (!test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
))
3044 else if (test_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
))
3049 if (test_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
))
3057 * Return status string @rdev
3059 * Status characters:
3061 * 'D' = Dead/Failed device
3062 * 'a' = Alive but not in-sync
3063 * 'A' = Alive and in-sync
3064 * '-' = Non-existing device (i.e. uspace passed '- -' into the ctr)
3066 static const char *__raid_dev_status(struct md_rdev
*rdev
, bool array_in_sync
)
3070 else if (test_bit(Faulty
, &rdev
->flags
))
3072 else if (!array_in_sync
|| !test_bit(In_sync
, &rdev
->flags
))
3078 /* Helper to return resync/reshape progress for @rs and @array_in_sync */
3079 static sector_t
rs_get_progress(struct raid_set
*rs
,
3080 sector_t resync_max_sectors
, bool *array_in_sync
)
3082 sector_t r
, recovery_cp
, curr_resync_completed
;
3083 struct mddev
*mddev
= &rs
->md
;
3085 curr_resync_completed
= mddev
->curr_resync_completed
?: mddev
->recovery_cp
;
3086 recovery_cp
= mddev
->recovery_cp
;
3087 *array_in_sync
= false;
3089 if (rs_is_raid0(rs
)) {
3090 r
= resync_max_sectors
;
3091 *array_in_sync
= true;
3094 r
= mddev
->reshape_position
;
3096 /* Reshape is relative to the array size */
3097 if (test_bit(MD_RECOVERY_RESHAPE
, &mddev
->recovery
) ||
3099 if (r
== MaxSector
) {
3100 *array_in_sync
= true;
3101 r
= resync_max_sectors
;
3103 /* Got to reverse on backward reshape */
3104 if (mddev
->reshape_backwards
)
3105 r
= mddev
->array_sectors
- r
;
3107 /* Devide by # of data stripes */
3108 sector_div(r
, mddev_data_stripes(rs
));
3111 /* Sync is relative to the component device size */
3112 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
))
3113 r
= curr_resync_completed
;
3117 if (r
== MaxSector
) {
3121 *array_in_sync
= true;
3122 r
= resync_max_sectors
;
3123 } else if (test_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
)) {
3125 * If "check" or "repair" is occurring, the raid set has
3126 * undergone an initial sync and the health characters
3127 * should not be 'a' anymore.
3129 *array_in_sync
= true;
3131 struct md_rdev
*rdev
;
3134 * The raid set may be doing an initial sync, or it may
3135 * be rebuilding individual components. If all the
3136 * devices are In_sync, then it is the raid set that is
3137 * being initialized.
3139 rdev_for_each(rdev
, mddev
)
3140 if (!test_bit(In_sync
, &rdev
->flags
))
3141 *array_in_sync
= true;
3143 r
= 0; /* HM FIXME: TESTME: https://bugzilla.redhat.com/show_bug.cgi?id=1210637 ? */
3151 /* Helper to return @dev name or "-" if !@dev */
3152 static const char *__get_dev_name(struct dm_dev
*dev
)
3154 return dev
? dev
->name
: "-";
3157 static void raid_status(struct dm_target
*ti
, status_type_t type
,
3158 unsigned int status_flags
, char *result
, unsigned int maxlen
)
3160 struct raid_set
*rs
= ti
->private;
3161 struct mddev
*mddev
= &rs
->md
;
3162 struct r5conf
*conf
= mddev
->private;
3163 int i
, max_nr_stripes
= conf
? conf
->max_nr_stripes
: 0;
3165 unsigned int raid_param_cnt
= 1; /* at least 1 for chunksize */
3166 unsigned int sz
= 0;
3167 unsigned int rebuild_disks
;
3168 unsigned int write_mostly_params
= 0;
3169 sector_t progress
, resync_max_sectors
, resync_mismatches
;
3170 const char *sync_action
;
3171 struct raid_type
*rt
;
3174 case STATUSTYPE_INFO
:
3175 /* *Should* always succeed */
3176 rt
= get_raid_type_by_ll(mddev
->new_level
, mddev
->new_layout
);
3180 DMEMIT("%s %d ", rt
->name
, mddev
->raid_disks
);
3182 /* Access most recent mddev properties for status output */
3184 /* Get sensible max sectors even if raid set not yet started */
3185 resync_max_sectors
= test_bit(RT_FLAG_RS_PRERESUMED
, &rs
->runtime_flags
) ?
3186 mddev
->resync_max_sectors
: mddev
->dev_sectors
;
3187 progress
= rs_get_progress(rs
, resync_max_sectors
, &array_in_sync
);
3188 resync_mismatches
= (mddev
->last_sync_action
&& !strcasecmp(mddev
->last_sync_action
, "check")) ?
3189 atomic64_read(&mddev
->resync_mismatches
) : 0;
3190 sync_action
= decipher_sync_action(&rs
->md
);
3192 /* HM FIXME: do we want another state char for raid0? It shows 'D'/'A'/'-' now */
3193 for (i
= 0; i
< rs
->raid_disks
; i
++)
3194 DMEMIT(__raid_dev_status(&rs
->dev
[i
].rdev
, array_in_sync
));
3197 * In-sync/Reshape ratio:
3198 * The in-sync ratio shows the progress of:
3199 * - Initializing the raid set
3200 * - Rebuilding a subset of devices of the raid set
3201 * The user can distinguish between the two by referring
3202 * to the status characters.
3204 * The reshape ratio shows the progress of
3205 * changing the raid layout or the number of
3206 * disks of a raid set
3208 DMEMIT(" %llu/%llu", (unsigned long long) progress
,
3209 (unsigned long long) resync_max_sectors
);
3215 * See Documentation/device-mapper/dm-raid.txt for
3216 * information on each of these states.
3218 DMEMIT(" %s", sync_action
);
3223 * resync_mismatches/mismatch_cnt
3224 * This field shows the number of discrepancies found when
3225 * performing a "check" of the raid set.
3227 DMEMIT(" %llu", (unsigned long long) resync_mismatches
);
3232 * data_offset (needed for out of space reshaping)
3233 * This field shows the data offset into the data
3234 * image LV where the first stripes data starts.
3236 * We keep data_offset equal on all raid disks of the set,
3237 * so retrieving it from the first raid disk is sufficient.
3239 DMEMIT(" %llu", (unsigned long long) rs
->dev
[0].rdev
.data_offset
);
3242 case STATUSTYPE_TABLE
:
3243 /* Report the table line string you would use to construct this raid set */
3245 /* Calculate raid parameter count */
3246 for (i
= 0; i
< rs
->raid_disks
; i
++)
3247 if (test_bit(WriteMostly
, &rs
->dev
[i
].rdev
.flags
))
3248 write_mostly_params
+= 2;
3249 rebuild_disks
= memweight(rs
->rebuild_disks
, DISKS_ARRAY_ELEMS
* sizeof(*rs
->rebuild_disks
));
3250 raid_param_cnt
+= rebuild_disks
* 2 +
3251 write_mostly_params
+
3252 hweight32(rs
->ctr_flags
& CTR_FLAG_OPTIONS_NO_ARGS
) +
3253 hweight32(rs
->ctr_flags
& CTR_FLAG_OPTIONS_ONE_ARG
) * 2;
3254 /* Emit table line */
3255 DMEMIT("%s %u %u", rs
->raid_type
->name
, raid_param_cnt
, mddev
->new_chunk_sectors
);
3256 if (test_bit(__CTR_FLAG_RAID10_FORMAT
, &rs
->ctr_flags
))
3257 DMEMIT(" %s %s", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_FORMAT
),
3258 raid10_md_layout_to_format(mddev
->layout
));
3259 if (test_bit(__CTR_FLAG_RAID10_COPIES
, &rs
->ctr_flags
))
3260 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_RAID10_COPIES
),
3261 raid10_md_layout_to_copies(mddev
->layout
));
3262 if (test_bit(__CTR_FLAG_NOSYNC
, &rs
->ctr_flags
))
3263 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_NOSYNC
));
3264 if (test_bit(__CTR_FLAG_SYNC
, &rs
->ctr_flags
))
3265 DMEMIT(" %s", dm_raid_arg_name_by_flag(CTR_FLAG_SYNC
));
3266 if (test_bit(__CTR_FLAG_REGION_SIZE
, &rs
->ctr_flags
))
3267 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_REGION_SIZE
),
3268 (unsigned long long) to_sector(mddev
->bitmap_info
.chunksize
));
3269 if (test_bit(__CTR_FLAG_DATA_OFFSET
, &rs
->ctr_flags
))
3270 DMEMIT(" %s %llu", dm_raid_arg_name_by_flag(CTR_FLAG_DATA_OFFSET
),
3271 (unsigned long long) rs
->data_offset
);
3272 if (test_bit(__CTR_FLAG_DAEMON_SLEEP
, &rs
->ctr_flags
))
3273 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_DAEMON_SLEEP
),
3274 mddev
->bitmap_info
.daemon_sleep
);
3275 if (test_bit(__CTR_FLAG_DELTA_DISKS
, &rs
->ctr_flags
))
3276 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_DELTA_DISKS
),
3277 max(rs
->delta_disks
, mddev
->delta_disks
));
3278 if (test_bit(__CTR_FLAG_STRIPE_CACHE
, &rs
->ctr_flags
))
3279 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_STRIPE_CACHE
),
3282 for (i
= 0; i
< rs
->raid_disks
; i
++)
3283 if (test_bit(rs
->dev
[i
].rdev
.raid_disk
, (void *) rs
->rebuild_disks
))
3284 DMEMIT(" %s %u", dm_raid_arg_name_by_flag(CTR_FLAG_REBUILD
),
3285 rs
->dev
[i
].rdev
.raid_disk
);
3286 if (write_mostly_params
)
3287 for (i
= 0; i
< rs
->raid_disks
; i
++)
3288 if (test_bit(WriteMostly
, &rs
->dev
[i
].rdev
.flags
))
3289 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_WRITE_MOSTLY
),
3290 rs
->dev
[i
].rdev
.raid_disk
);
3291 if (test_bit(__CTR_FLAG_MAX_WRITE_BEHIND
, &rs
->ctr_flags
))
3292 DMEMIT(" %s %lu", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_WRITE_BEHIND
),
3293 mddev
->bitmap_info
.max_write_behind
);
3294 if (test_bit(__CTR_FLAG_MAX_RECOVERY_RATE
, &rs
->ctr_flags
))
3295 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MAX_RECOVERY_RATE
),
3296 mddev
->sync_speed_max
);
3297 if (test_bit(__CTR_FLAG_MIN_RECOVERY_RATE
, &rs
->ctr_flags
))
3298 DMEMIT(" %s %d", dm_raid_arg_name_by_flag(CTR_FLAG_MIN_RECOVERY_RATE
),
3299 mddev
->sync_speed_min
);
3300 DMEMIT(" %d", rs
->raid_disks
);
3301 for (i
= 0; i
< rs
->raid_disks
; i
++)
3302 DMEMIT(" %s %s", __get_dev_name(rs
->dev
[i
].meta_dev
),
3303 __get_dev_name(rs
->dev
[i
].data_dev
));
3307 static int raid_message(struct dm_target
*ti
, unsigned int argc
, char **argv
)
3309 struct raid_set
*rs
= ti
->private;
3310 struct mddev
*mddev
= &rs
->md
;
3312 if (!mddev
->pers
|| !mddev
->pers
->sync_request
)
3315 if (!strcasecmp(argv
[0], "frozen"))
3316 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3318 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3320 if (!strcasecmp(argv
[0], "idle") || !strcasecmp(argv
[0], "frozen")) {
3321 if (mddev
->sync_thread
) {
3322 set_bit(MD_RECOVERY_INTR
, &mddev
->recovery
);
3323 md_reap_sync_thread(mddev
);
3325 } else if (test_bit(MD_RECOVERY_RUNNING
, &mddev
->recovery
) ||
3326 test_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
))
3328 else if (!strcasecmp(argv
[0], "resync"))
3329 ; /* MD_RECOVERY_NEEDED set below */
3330 else if (!strcasecmp(argv
[0], "recover"))
3331 set_bit(MD_RECOVERY_RECOVER
, &mddev
->recovery
);
3333 if (!strcasecmp(argv
[0], "check"))
3334 set_bit(MD_RECOVERY_CHECK
, &mddev
->recovery
);
3335 else if (!!strcasecmp(argv
[0], "repair"))
3337 set_bit(MD_RECOVERY_REQUESTED
, &mddev
->recovery
);
3338 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3340 if (mddev
->ro
== 2) {
3341 /* A write to sync_action is enough to justify
3342 * canceling read-auto mode
3345 if (!mddev
->suspended
&& mddev
->sync_thread
)
3346 md_wakeup_thread(mddev
->sync_thread
);
3348 set_bit(MD_RECOVERY_NEEDED
, &mddev
->recovery
);
3349 if (!mddev
->suspended
&& mddev
->thread
)
3350 md_wakeup_thread(mddev
->thread
);
3355 static int raid_iterate_devices(struct dm_target
*ti
,
3356 iterate_devices_callout_fn fn
, void *data
)
3358 struct raid_set
*rs
= ti
->private;
3362 for (i
= 0; !r
&& i
< rs
->md
.raid_disks
; i
++)
3363 if (rs
->dev
[i
].data_dev
)
3365 rs
->dev
[i
].data_dev
,
3366 0, /* No offset on data devs */
3373 static void raid_io_hints(struct dm_target
*ti
, struct queue_limits
*limits
)
3375 struct raid_set
*rs
= ti
->private;
3376 unsigned int chunk_size
= to_bytes(rs
->md
.chunk_sectors
);
3378 blk_limits_io_min(limits
, chunk_size
);
3379 blk_limits_io_opt(limits
, chunk_size
* mddev_data_stripes(rs
));
3382 static void raid_presuspend(struct dm_target
*ti
)
3384 struct raid_set
*rs
= ti
->private;
3386 md_stop_writes(&rs
->md
);
3389 static void raid_postsuspend(struct dm_target
*ti
)
3391 struct raid_set
*rs
= ti
->private;
3393 if (!rs
->md
.suspended
)
3394 mddev_suspend(&rs
->md
);
3399 static void attempt_restore_of_faulty_devices(struct raid_set
*rs
)
3402 uint64_t cleared_failed_devices
[DISKS_ARRAY_ELEMS
];
3403 unsigned long flags
;
3404 bool cleared
= false;
3405 struct dm_raid_superblock
*sb
;
3406 struct mddev
*mddev
= &rs
->md
;
3409 /* RAID personalities have to provide hot add/remove methods or we need to bail out. */
3410 if (!mddev
->pers
|| !mddev
->pers
->hot_add_disk
|| !mddev
->pers
->hot_remove_disk
)
3413 memset(cleared_failed_devices
, 0, sizeof(cleared_failed_devices
));
3415 for (i
= 0; i
< mddev
->raid_disks
; i
++) {
3416 r
= &rs
->dev
[i
].rdev
;
3417 if (test_bit(Faulty
, &r
->flags
) && r
->sb_page
&&
3418 sync_page_io(r
, 0, r
->sb_size
, r
->sb_page
,
3419 REQ_OP_READ
, 0, true)) {
3420 DMINFO("Faulty %s device #%d has readable super block."
3421 " Attempting to revive it.",
3422 rs
->raid_type
->name
, i
);
3425 * Faulty bit may be set, but sometimes the array can
3426 * be suspended before the personalities can respond
3427 * by removing the device from the array (i.e. calling
3428 * 'hot_remove_disk'). If they haven't yet removed
3429 * the failed device, its 'raid_disk' number will be
3430 * '>= 0' - meaning we must call this function
3434 clear_bit(In_sync
, &r
->flags
); /* Mandatory for hot remove. */
3435 if (r
->raid_disk
>= 0) {
3436 if (mddev
->pers
->hot_remove_disk(mddev
, r
)) {
3437 /* Failed to revive this device, try next */
3442 r
->raid_disk
= r
->saved_raid_disk
= i
;
3444 clear_bit(Faulty
, &r
->flags
);
3445 clear_bit(WriteErrorSeen
, &r
->flags
);
3447 if (mddev
->pers
->hot_add_disk(mddev
, r
)) {
3448 /* Failed to revive this device, try next */
3449 r
->raid_disk
= r
->saved_raid_disk
= -1;
3452 clear_bit(In_sync
, &r
->flags
);
3453 r
->recovery_offset
= 0;
3454 set_bit(i
, (void *) cleared_failed_devices
);
3460 /* If any failed devices could be cleared, update all sbs failed_devices bits */
3462 uint64_t failed_devices
[DISKS_ARRAY_ELEMS
];
3464 rdev_for_each(r
, &rs
->md
) {
3465 sb
= page_address(r
->sb_page
);
3466 sb_retrieve_failed_devices(sb
, failed_devices
);
3468 for (i
= 0; i
< DISKS_ARRAY_ELEMS
; i
++)
3469 failed_devices
[i
] &= ~cleared_failed_devices
[i
];
3471 sb_update_failed_devices(sb
, failed_devices
);
3476 static int __load_dirty_region_bitmap(struct raid_set
*rs
)
3480 /* Try loading the bitmap unless "raid0", which does not have one */
3481 if (!rs_is_raid0(rs
) &&
3482 !test_and_set_bit(RT_FLAG_RS_BITMAP_LOADED
, &rs
->runtime_flags
)) {
3483 r
= bitmap_load(&rs
->md
);
3485 DMERR("Failed to load bitmap");
3491 /* Enforce updating all superblocks */
3492 static void rs_update_sbs(struct raid_set
*rs
)
3494 struct mddev
*mddev
= &rs
->md
;
3497 set_bit(MD_SB_CHANGE_DEVS
, &mddev
->sb_flags
);
3499 md_update_sb(mddev
, 1);
3504 * Reshape changes raid algorithm of @rs to new one within personality
3505 * (e.g. raid6_zr -> raid6_nc), changes stripe size, adds/removes
3506 * disks from a raid set thus growing/shrinking it or resizes the set
3508 * Call mddev_lock_nointr() before!
3510 static int rs_start_reshape(struct raid_set
*rs
)
3513 struct mddev
*mddev
= &rs
->md
;
3514 struct md_personality
*pers
= mddev
->pers
;
3516 r
= rs_setup_reshape(rs
);
3520 /* Need to be resumed to be able to start reshape, recovery is frozen until raid_resume() though */
3521 if (mddev
->suspended
)
3522 mddev_resume(mddev
);
3525 * Check any reshape constraints enforced by the personalility
3527 * May as well already kick the reshape off so that * pers->start_reshape() becomes optional.
3529 r
= pers
->check_reshape(mddev
);
3531 rs
->ti
->error
= "pers->check_reshape() failed";
3536 * Personality may not provide start reshape method in which
3537 * case check_reshape above has already covered everything
3539 if (pers
->start_reshape
) {
3540 r
= pers
->start_reshape(mddev
);
3542 rs
->ti
->error
= "pers->start_reshape() failed";
3547 /* Suspend because a resume will happen in raid_resume() */
3548 if (!mddev
->suspended
)
3549 mddev_suspend(mddev
);
3552 * Now reshape got set up, update superblocks to
3553 * reflect the fact so that a table reload will
3554 * access proper superblock content in the ctr.
3561 static int raid_preresume(struct dm_target
*ti
)
3564 struct raid_set
*rs
= ti
->private;
3565 struct mddev
*mddev
= &rs
->md
;
3567 /* This is a resume after a suspend of the set -> it's already started */
3568 if (test_and_set_bit(RT_FLAG_RS_PRERESUMED
, &rs
->runtime_flags
))
3572 * The superblocks need to be updated on disk if the
3573 * array is new or new devices got added (thus zeroed
3574 * out by userspace) or __load_dirty_region_bitmap
3575 * will overwrite them in core with old data or fail.
3577 if (test_bit(RT_FLAG_UPDATE_SBS
, &rs
->runtime_flags
))
3580 /* Load the bitmap from disk unless raid0 */
3581 r
= __load_dirty_region_bitmap(rs
);
3585 /* Resize bitmap to adjust to changed region size (aka MD bitmap chunksize) */
3586 if (test_bit(RT_FLAG_RS_BITMAP_LOADED
, &rs
->runtime_flags
) &&
3587 mddev
->bitmap_info
.chunksize
!= to_bytes(rs
->requested_bitmap_chunk_sectors
)) {
3588 r
= bitmap_resize(mddev
->bitmap
, mddev
->dev_sectors
,
3589 to_bytes(rs
->requested_bitmap_chunk_sectors
), 0);
3591 DMERR("Failed to resize bitmap");
3594 /* Check for any resize/reshape on @rs and adjust/initiate */
3595 /* Be prepared for mddev_resume() in raid_resume() */
3596 set_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3597 if (mddev
->recovery_cp
&& mddev
->recovery_cp
< MaxSector
) {
3598 set_bit(MD_RECOVERY_SYNC
, &mddev
->recovery
);
3599 mddev
->resync_min
= mddev
->recovery_cp
;
3602 rs_set_capacity(rs
);
3604 /* Check for any reshape request unless new raid set */
3605 if (test_and_clear_bit(RT_FLAG_RESHAPE_RS
, &rs
->runtime_flags
)) {
3606 /* Initiate a reshape. */
3607 mddev_lock_nointr(mddev
);
3608 r
= rs_start_reshape(rs
);
3609 mddev_unlock(mddev
);
3611 DMWARN("Failed to check/start reshape, continuing without change");
3618 static void raid_resume(struct dm_target
*ti
)
3620 struct raid_set
*rs
= ti
->private;
3621 struct mddev
*mddev
= &rs
->md
;
3623 if (test_and_set_bit(RT_FLAG_RS_RESUMED
, &rs
->runtime_flags
)) {
3625 * A secondary resume while the device is active.
3626 * Take this opportunity to check whether any failed
3627 * devices are reachable again.
3629 attempt_restore_of_faulty_devices(rs
);
3635 clear_bit(MD_RECOVERY_FROZEN
, &mddev
->recovery
);
3637 if (mddev
->suspended
)
3638 mddev_resume(mddev
);
3641 static struct target_type raid_target
= {
3643 .version
= {1, 9, 2},
3644 .module
= THIS_MODULE
,
3648 .status
= raid_status
,
3649 .message
= raid_message
,
3650 .iterate_devices
= raid_iterate_devices
,
3651 .io_hints
= raid_io_hints
,
3652 .presuspend
= raid_presuspend
,
3653 .postsuspend
= raid_postsuspend
,
3654 .preresume
= raid_preresume
,
3655 .resume
= raid_resume
,
3658 static int __init
dm_raid_init(void)
3660 DMINFO("Loading target version %u.%u.%u",
3661 raid_target
.version
[0],
3662 raid_target
.version
[1],
3663 raid_target
.version
[2]);
3664 return dm_register_target(&raid_target
);
3667 static void __exit
dm_raid_exit(void)
3669 dm_unregister_target(&raid_target
);
3672 module_init(dm_raid_init
);
3673 module_exit(dm_raid_exit
);
3675 module_param(devices_handle_discard_safely
, bool, 0644);
3676 MODULE_PARM_DESC(devices_handle_discard_safely
,
3677 "Set to Y if all devices in each array reliably return zeroes on reads from discarded regions");
3679 MODULE_DESCRIPTION(DM_NAME
" raid0/1/10/4/5/6 target");
3680 MODULE_ALIAS("dm-raid0");
3681 MODULE_ALIAS("dm-raid1");
3682 MODULE_ALIAS("dm-raid10");
3683 MODULE_ALIAS("dm-raid4");
3684 MODULE_ALIAS("dm-raid5");
3685 MODULE_ALIAS("dm-raid6");
3686 MODULE_AUTHOR("Neil Brown <dm-devel@redhat.com>");
3687 MODULE_AUTHOR("Heinz Mauelshagen <dm-devel@redhat.com>");
3688 MODULE_LICENSE("GPL");