Commit | Line | Data |
---|---|---|
af1a8899 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | raid0.c : Multiple Devices driver for Linux | |
f72ffdd6 | 4 | Copyright (C) 1994-96 Marc ZYNGIER |
1da177e4 LT |
5 | <zyngier@ufr-info-p7.ibp.fr> or |
6 | <maz@gloups.fdn.fr> | |
f72ffdd6 | 7 | Copyright (C) 1999, 2000 Ingo Molnar, Red Hat |
1da177e4 LT |
8 | |
9 | RAID-0 management functions. | |
10 | ||
1da177e4 LT |
11 | */ |
12 | ||
bff61975 | 13 | #include <linux/blkdev.h> |
bff61975 | 14 | #include <linux/seq_file.h> |
056075c7 | 15 | #include <linux/module.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
109e3765 | 17 | #include <trace/events/block.h> |
43b2e5d8 | 18 | #include "md.h" |
ef740c37 | 19 | #include "raid0.h" |
9af204cf | 20 | #include "raid5.h" |
1da177e4 | 21 | |
c84a1372 N |
22 | static int default_layout = 0; |
23 | module_param(default_layout, int, 0644); | |
24 | ||
394ed8e4 SL |
25 | #define UNSUPPORTED_MDDEV_FLAGS \ |
26 | ((1L << MD_HAS_JOURNAL) | \ | |
27 | (1L << MD_JOURNAL_CLEAN) | \ | |
ea0213e0 | 28 | (1L << MD_FAILFAST_SUPPORTED) |\ |
ddc08823 PB |
29 | (1L << MD_HAS_PPL) | \ |
30 | (1L << MD_HAS_MULTIPLE_PPLS)) | |
394ed8e4 | 31 | |
5c675f83 | 32 | static int raid0_congested(struct mddev *mddev, int bits) |
26be34dc | 33 | { |
e373ab10 | 34 | struct r0conf *conf = mddev->private; |
3cb03002 | 35 | struct md_rdev **devlist = conf->devlist; |
84707f38 | 36 | int raid_disks = conf->strip_zone[0].nb_dev; |
26be34dc N |
37 | int i, ret = 0; |
38 | ||
84707f38 | 39 | for (i = 0; i < raid_disks && !ret ; i++) { |
165125e1 | 40 | struct request_queue *q = bdev_get_queue(devlist[i]->bdev); |
26be34dc | 41 | |
dc3b17cc | 42 | ret |= bdi_congested(q->backing_dev_info, bits); |
26be34dc N |
43 | } |
44 | return ret; | |
45 | } | |
46 | ||
46994191 | 47 | /* |
48 | * inform the user of the raid configuration | |
49 | */ | |
fd01b88c | 50 | static void dump_zones(struct mddev *mddev) |
46994191 | 51 | { |
50de8df4 | 52 | int j, k; |
46994191 | 53 | sector_t zone_size = 0; |
54 | sector_t zone_start = 0; | |
55 | char b[BDEVNAME_SIZE]; | |
e373ab10 | 56 | struct r0conf *conf = mddev->private; |
84707f38 | 57 | int raid_disks = conf->strip_zone[0].nb_dev; |
76603884 N |
58 | pr_debug("md: RAID0 configuration for %s - %d zone%s\n", |
59 | mdname(mddev), | |
60 | conf->nr_strip_zones, conf->nr_strip_zones==1?"":"s"); | |
46994191 | 61 | for (j = 0; j < conf->nr_strip_zones; j++) { |
76603884 N |
62 | char line[200]; |
63 | int len = 0; | |
64 | ||
46994191 | 65 | for (k = 0; k < conf->strip_zone[j].nb_dev; k++) |
76603884 N |
66 | len += snprintf(line+len, 200-len, "%s%s", k?"/":"", |
67 | bdevname(conf->devlist[j*raid_disks | |
68 | + k]->bdev, b)); | |
69 | pr_debug("md: zone%d=[%s]\n", j, line); | |
46994191 | 70 | |
71 | zone_size = conf->strip_zone[j].zone_end - zone_start; | |
76603884 | 72 | pr_debug(" zone-offset=%10lluKB, device-offset=%10lluKB, size=%10lluKB\n", |
46994191 | 73 | (unsigned long long)zone_start>>1, |
74 | (unsigned long long)conf->strip_zone[j].dev_start>>1, | |
75 | (unsigned long long)zone_size>>1); | |
76 | zone_start = conf->strip_zone[j].zone_end; | |
77 | } | |
46994191 | 78 | } |
79 | ||
e373ab10 | 80 | static int create_strip_zones(struct mddev *mddev, struct r0conf **private_conf) |
1da177e4 | 81 | { |
a9f326eb | 82 | int i, c, err; |
49f357a2 | 83 | sector_t curr_zone_end, sectors; |
3cb03002 | 84 | struct md_rdev *smallest, *rdev1, *rdev2, *rdev, **dev; |
1da177e4 LT |
85 | struct strip_zone *zone; |
86 | int cnt; | |
87 | char b[BDEVNAME_SIZE]; | |
50de8df4 | 88 | char b2[BDEVNAME_SIZE]; |
e373ab10 | 89 | struct r0conf *conf = kzalloc(sizeof(*conf), GFP_KERNEL); |
ad6bf88a | 90 | unsigned blksize = 512; |
ed7b0038 | 91 | |
7dedd15d | 92 | *private_conf = ERR_PTR(-ENOMEM); |
ed7b0038 AN |
93 | if (!conf) |
94 | return -ENOMEM; | |
dafb20fa | 95 | rdev_for_each(rdev1, mddev) { |
50de8df4 N |
96 | pr_debug("md/raid0:%s: looking at %s\n", |
97 | mdname(mddev), | |
98 | bdevname(rdev1->bdev, b)); | |
1da177e4 | 99 | c = 0; |
13f2682b N |
100 | |
101 | /* round size to chunk_size */ | |
102 | sectors = rdev1->sectors; | |
103 | sector_div(sectors, mddev->chunk_sectors); | |
104 | rdev1->sectors = sectors * mddev->chunk_sectors; | |
105 | ||
199dc6ed N |
106 | blksize = max(blksize, queue_logical_block_size( |
107 | rdev1->bdev->bd_disk->queue)); | |
108 | ||
dafb20fa | 109 | rdev_for_each(rdev2, mddev) { |
50de8df4 N |
110 | pr_debug("md/raid0:%s: comparing %s(%llu)" |
111 | " with %s(%llu)\n", | |
112 | mdname(mddev), | |
113 | bdevname(rdev1->bdev,b), | |
114 | (unsigned long long)rdev1->sectors, | |
115 | bdevname(rdev2->bdev,b2), | |
116 | (unsigned long long)rdev2->sectors); | |
1da177e4 | 117 | if (rdev2 == rdev1) { |
50de8df4 N |
118 | pr_debug("md/raid0:%s: END\n", |
119 | mdname(mddev)); | |
1da177e4 LT |
120 | break; |
121 | } | |
dd8ac336 | 122 | if (rdev2->sectors == rdev1->sectors) { |
1da177e4 LT |
123 | /* |
124 | * Not unique, don't count it as a new | |
125 | * group | |
126 | */ | |
50de8df4 N |
127 | pr_debug("md/raid0:%s: EQUAL\n", |
128 | mdname(mddev)); | |
1da177e4 LT |
129 | c = 1; |
130 | break; | |
131 | } | |
50de8df4 N |
132 | pr_debug("md/raid0:%s: NOT EQUAL\n", |
133 | mdname(mddev)); | |
1da177e4 LT |
134 | } |
135 | if (!c) { | |
50de8df4 N |
136 | pr_debug("md/raid0:%s: ==> UNIQUE\n", |
137 | mdname(mddev)); | |
1da177e4 | 138 | conf->nr_strip_zones++; |
50de8df4 N |
139 | pr_debug("md/raid0:%s: %d zones\n", |
140 | mdname(mddev), conf->nr_strip_zones); | |
1da177e4 LT |
141 | } |
142 | } | |
50de8df4 N |
143 | pr_debug("md/raid0:%s: FINAL %d zones\n", |
144 | mdname(mddev), conf->nr_strip_zones); | |
c84a1372 N |
145 | |
146 | if (conf->nr_strip_zones == 1) { | |
147 | conf->layout = RAID0_ORIG_LAYOUT; | |
33f2c35a N |
148 | } else if (mddev->layout == RAID0_ORIG_LAYOUT || |
149 | mddev->layout == RAID0_ALT_MULTIZONE_LAYOUT) { | |
150 | conf->layout = mddev->layout; | |
c84a1372 N |
151 | } else if (default_layout == RAID0_ORIG_LAYOUT || |
152 | default_layout == RAID0_ALT_MULTIZONE_LAYOUT) { | |
153 | conf->layout = default_layout; | |
154 | } else { | |
155 | pr_err("md/raid0:%s: cannot assemble multi-zone RAID0 with default_layout setting\n", | |
156 | mdname(mddev)); | |
3874d73e | 157 | pr_err("md/raid0: please set raid0.default_layout to 1 or 2\n"); |
c84a1372 N |
158 | err = -ENOTSUPP; |
159 | goto abort; | |
160 | } | |
199dc6ed N |
161 | /* |
162 | * now since we have the hard sector sizes, we can make sure | |
163 | * chunk size is a multiple of that sector size | |
164 | */ | |
165 | if ((mddev->chunk_sectors << 9) % blksize) { | |
76603884 N |
166 | pr_warn("md/raid0:%s: chunk_size of %d not multiple of block size %d\n", |
167 | mdname(mddev), | |
168 | mddev->chunk_sectors << 9, blksize); | |
199dc6ed N |
169 | err = -EINVAL; |
170 | goto abort; | |
171 | } | |
172 | ||
ed7b0038 | 173 | err = -ENOMEM; |
6396bb22 KC |
174 | conf->strip_zone = kcalloc(conf->nr_strip_zones, |
175 | sizeof(struct strip_zone), | |
176 | GFP_KERNEL); | |
1da177e4 | 177 | if (!conf->strip_zone) |
ed7b0038 | 178 | goto abort; |
6396bb22 KC |
179 | conf->devlist = kzalloc(array3_size(sizeof(struct md_rdev *), |
180 | conf->nr_strip_zones, | |
181 | mddev->raid_disks), | |
1da177e4 LT |
182 | GFP_KERNEL); |
183 | if (!conf->devlist) | |
ed7b0038 | 184 | goto abort; |
1da177e4 | 185 | |
1da177e4 LT |
186 | /* The first zone must contain all devices, so here we check that |
187 | * there is a proper alignment of slots to devices and find them all | |
188 | */ | |
189 | zone = &conf->strip_zone[0]; | |
190 | cnt = 0; | |
191 | smallest = NULL; | |
b414579f | 192 | dev = conf->devlist; |
ed7b0038 | 193 | err = -EINVAL; |
dafb20fa | 194 | rdev_for_each(rdev1, mddev) { |
1da177e4 LT |
195 | int j = rdev1->raid_disk; |
196 | ||
e93f68a1 | 197 | if (mddev->level == 10) { |
9af204cf TM |
198 | /* taking over a raid10-n2 array */ |
199 | j /= 2; | |
e93f68a1 N |
200 | rdev1->new_raid_disk = j; |
201 | } | |
9af204cf | 202 | |
fc3a08b8 KW |
203 | if (mddev->level == 1) { |
204 | /* taiking over a raid1 array- | |
205 | * we have only one active disk | |
206 | */ | |
207 | j = 0; | |
208 | rdev1->new_raid_disk = j; | |
209 | } | |
210 | ||
f96c9f30 | 211 | if (j < 0) { |
76603884 N |
212 | pr_warn("md/raid0:%s: remove inactive devices before converting to RAID0\n", |
213 | mdname(mddev)); | |
f96c9f30 N |
214 | goto abort; |
215 | } | |
216 | if (j >= mddev->raid_disks) { | |
76603884 N |
217 | pr_warn("md/raid0:%s: bad disk number %d - aborting!\n", |
218 | mdname(mddev), j); | |
1da177e4 LT |
219 | goto abort; |
220 | } | |
b414579f | 221 | if (dev[j]) { |
76603884 N |
222 | pr_warn("md/raid0:%s: multiple devices for %d - aborting!\n", |
223 | mdname(mddev), j); | |
1da177e4 LT |
224 | goto abort; |
225 | } | |
b414579f | 226 | dev[j] = rdev1; |
1da177e4 | 227 | |
dd8ac336 | 228 | if (!smallest || (rdev1->sectors < smallest->sectors)) |
1da177e4 LT |
229 | smallest = rdev1; |
230 | cnt++; | |
231 | } | |
232 | if (cnt != mddev->raid_disks) { | |
76603884 N |
233 | pr_warn("md/raid0:%s: too few disks (%d of %d) - aborting!\n", |
234 | mdname(mddev), cnt, mddev->raid_disks); | |
1da177e4 LT |
235 | goto abort; |
236 | } | |
237 | zone->nb_dev = cnt; | |
49f357a2 | 238 | zone->zone_end = smallest->sectors * cnt; |
1da177e4 | 239 | |
49f357a2 | 240 | curr_zone_end = zone->zone_end; |
1da177e4 LT |
241 | |
242 | /* now do the other zones */ | |
243 | for (i = 1; i < conf->nr_strip_zones; i++) | |
244 | { | |
a9f326eb N |
245 | int j; |
246 | ||
1da177e4 | 247 | zone = conf->strip_zone + i; |
b414579f | 248 | dev = conf->devlist + i * mddev->raid_disks; |
1da177e4 | 249 | |
50de8df4 | 250 | pr_debug("md/raid0:%s: zone %d\n", mdname(mddev), i); |
d27a43ab | 251 | zone->dev_start = smallest->sectors; |
1da177e4 LT |
252 | smallest = NULL; |
253 | c = 0; | |
254 | ||
255 | for (j=0; j<cnt; j++) { | |
b414579f | 256 | rdev = conf->devlist[j]; |
d27a43ab | 257 | if (rdev->sectors <= zone->dev_start) { |
50de8df4 N |
258 | pr_debug("md/raid0:%s: checking %s ... nope\n", |
259 | mdname(mddev), | |
260 | bdevname(rdev->bdev, b)); | |
dd8ac336 AN |
261 | continue; |
262 | } | |
50de8df4 N |
263 | pr_debug("md/raid0:%s: checking %s ..." |
264 | " contained as device %d\n", | |
265 | mdname(mddev), | |
266 | bdevname(rdev->bdev, b), c); | |
b414579f | 267 | dev[c] = rdev; |
dd8ac336 AN |
268 | c++; |
269 | if (!smallest || rdev->sectors < smallest->sectors) { | |
270 | smallest = rdev; | |
50de8df4 N |
271 | pr_debug("md/raid0:%s: (%llu) is smallest!.\n", |
272 | mdname(mddev), | |
273 | (unsigned long long)rdev->sectors); | |
dd8ac336 | 274 | } |
1da177e4 LT |
275 | } |
276 | ||
277 | zone->nb_dev = c; | |
49f357a2 | 278 | sectors = (smallest->sectors - zone->dev_start) * c; |
50de8df4 N |
279 | pr_debug("md/raid0:%s: zone->nb_dev: %d, sectors: %llu\n", |
280 | mdname(mddev), | |
281 | zone->nb_dev, (unsigned long long)sectors); | |
1da177e4 | 282 | |
49f357a2 | 283 | curr_zone_end += sectors; |
d27a43ab | 284 | zone->zone_end = curr_zone_end; |
1da177e4 | 285 | |
50de8df4 N |
286 | pr_debug("md/raid0:%s: current zone start: %llu\n", |
287 | mdname(mddev), | |
288 | (unsigned long long)smallest->sectors); | |
1da177e4 | 289 | } |
1da177e4 | 290 | |
50de8df4 | 291 | pr_debug("md/raid0:%s: done.\n", mdname(mddev)); |
9af204cf TM |
292 | *private_conf = conf; |
293 | ||
1da177e4 | 294 | return 0; |
5568a603 | 295 | abort: |
ed7b0038 AN |
296 | kfree(conf->strip_zone); |
297 | kfree(conf->devlist); | |
298 | kfree(conf); | |
58ebb34c | 299 | *private_conf = ERR_PTR(err); |
ed7b0038 | 300 | return err; |
1da177e4 LT |
301 | } |
302 | ||
ba13da47 N |
303 | /* Find the zone which holds a particular offset |
304 | * Update *sectorp to be an offset in that zone | |
305 | */ | |
306 | static struct strip_zone *find_zone(struct r0conf *conf, | |
307 | sector_t *sectorp) | |
308 | { | |
309 | int i; | |
310 | struct strip_zone *z = conf->strip_zone; | |
311 | sector_t sector = *sectorp; | |
312 | ||
313 | for (i = 0; i < conf->nr_strip_zones; i++) | |
314 | if (sector < z[i].zone_end) { | |
315 | if (i) | |
316 | *sectorp = sector - z[i-1].zone_end; | |
317 | return z + i; | |
318 | } | |
319 | BUG(); | |
320 | } | |
321 | ||
322 | /* | |
323 | * remaps the bio to the target device. we separate two flows. | |
47d68979 | 324 | * power 2 flow and a general flow for the sake of performance |
ba13da47 N |
325 | */ |
326 | static struct md_rdev *map_sector(struct mddev *mddev, struct strip_zone *zone, | |
327 | sector_t sector, sector_t *sector_offset) | |
328 | { | |
329 | unsigned int sect_in_chunk; | |
330 | sector_t chunk; | |
331 | struct r0conf *conf = mddev->private; | |
332 | int raid_disks = conf->strip_zone[0].nb_dev; | |
333 | unsigned int chunk_sects = mddev->chunk_sectors; | |
334 | ||
335 | if (is_power_of_2(chunk_sects)) { | |
336 | int chunksect_bits = ffz(~chunk_sects); | |
337 | /* find the sector offset inside the chunk */ | |
338 | sect_in_chunk = sector & (chunk_sects - 1); | |
339 | sector >>= chunksect_bits; | |
340 | /* chunk in zone */ | |
341 | chunk = *sector_offset; | |
342 | /* quotient is the chunk in real device*/ | |
343 | sector_div(chunk, zone->nb_dev << chunksect_bits); | |
344 | } else{ | |
345 | sect_in_chunk = sector_div(sector, chunk_sects); | |
346 | chunk = *sector_offset; | |
347 | sector_div(chunk, chunk_sects * zone->nb_dev); | |
348 | } | |
349 | /* | |
350 | * position the bio over the real device | |
351 | * real sector = chunk in device + starting of zone | |
352 | * + the position in the chunk | |
353 | */ | |
354 | *sector_offset = (chunk * chunk_sects) + sect_in_chunk; | |
355 | return conf->devlist[(zone - conf->strip_zone)*raid_disks | |
356 | + sector_div(sector, zone->nb_dev)]; | |
357 | } | |
358 | ||
fd01b88c | 359 | static sector_t raid0_size(struct mddev *mddev, sector_t sectors, int raid_disks) |
80c3a6ce DW |
360 | { |
361 | sector_t array_sectors = 0; | |
3cb03002 | 362 | struct md_rdev *rdev; |
80c3a6ce DW |
363 | |
364 | WARN_ONCE(sectors || raid_disks, | |
365 | "%s does not support generic reshape\n", __func__); | |
366 | ||
dafb20fa | 367 | rdev_for_each(rdev, mddev) |
a6468539 N |
368 | array_sectors += (rdev->sectors & |
369 | ~(sector_t)(mddev->chunk_sectors-1)); | |
80c3a6ce DW |
370 | |
371 | return array_sectors; | |
372 | } | |
373 | ||
afa0f557 | 374 | static void raid0_free(struct mddev *mddev, void *priv); |
0366ef84 | 375 | |
fd01b88c | 376 | static int raid0_run(struct mddev *mddev) |
1da177e4 | 377 | { |
e373ab10 | 378 | struct r0conf *conf; |
5568a603 | 379 | int ret; |
1da177e4 | 380 | |
9d8f0363 | 381 | if (mddev->chunk_sectors == 0) { |
76603884 | 382 | pr_warn("md/raid0:%s: chunk size must be set.\n", mdname(mddev)); |
2604b703 N |
383 | return -EINVAL; |
384 | } | |
0894cc30 AN |
385 | if (md_check_no_bitmap(mddev)) |
386 | return -EINVAL; | |
753f2856 | 387 | |
9af204cf TM |
388 | /* if private is not null, we are here after takeover */ |
389 | if (mddev->private == NULL) { | |
390 | ret = create_strip_zones(mddev, &conf); | |
391 | if (ret < 0) | |
392 | return ret; | |
393 | mddev->private = conf; | |
394 | } | |
395 | conf = mddev->private; | |
199dc6ed N |
396 | if (mddev->queue) { |
397 | struct md_rdev *rdev; | |
398 | bool discard_supported = false; | |
399 | ||
199dc6ed N |
400 | blk_queue_max_hw_sectors(mddev->queue, mddev->chunk_sectors); |
401 | blk_queue_max_write_same_sectors(mddev->queue, mddev->chunk_sectors); | |
3deff1a7 | 402 | blk_queue_max_write_zeroes_sectors(mddev->queue, mddev->chunk_sectors); |
29efc390 | 403 | blk_queue_max_discard_sectors(mddev->queue, UINT_MAX); |
199dc6ed N |
404 | |
405 | blk_queue_io_min(mddev->queue, mddev->chunk_sectors << 9); | |
406 | blk_queue_io_opt(mddev->queue, | |
407 | (mddev->chunk_sectors << 9) * mddev->raid_disks); | |
408 | ||
66eefe5d N |
409 | rdev_for_each(rdev, mddev) { |
410 | disk_stack_limits(mddev->gendisk, rdev->bdev, | |
411 | rdev->data_offset << 9); | |
412 | if (blk_queue_discard(bdev_get_queue(rdev->bdev))) | |
413 | discard_supported = true; | |
414 | } | |
199dc6ed | 415 | if (!discard_supported) |
8b904b5b | 416 | blk_queue_flag_clear(QUEUE_FLAG_DISCARD, mddev->queue); |
199dc6ed | 417 | else |
8b904b5b | 418 | blk_queue_flag_set(QUEUE_FLAG_DISCARD, mddev->queue); |
199dc6ed | 419 | } |
1da177e4 LT |
420 | |
421 | /* calculate array device size */ | |
1f403624 | 422 | md_set_array_sectors(mddev, raid0_size(mddev, 0, 0)); |
1da177e4 | 423 | |
76603884 N |
424 | pr_debug("md/raid0:%s: md_size is %llu sectors.\n", |
425 | mdname(mddev), | |
426 | (unsigned long long)mddev->array_sectors); | |
753f2856 HM |
427 | |
428 | if (mddev->queue) { | |
429 | /* calculate the max read-ahead size. | |
430 | * For read-ahead of large files to be effective, we need to | |
431 | * readahead at least twice a whole stripe. i.e. number of devices | |
432 | * multiplied by chunk size times 2. | |
433 | * If an individual device has an ra_pages greater than the | |
434 | * chunk size, then we will not drive that device as hard as it | |
435 | * wants. We consider this a configuration error: a larger | |
436 | * chunksize should be used in that case. | |
437 | */ | |
9d8f0363 AN |
438 | int stripe = mddev->raid_disks * |
439 | (mddev->chunk_sectors << 9) / PAGE_SIZE; | |
dc3b17cc JK |
440 | if (mddev->queue->backing_dev_info->ra_pages < 2* stripe) |
441 | mddev->queue->backing_dev_info->ra_pages = 2* stripe; | |
1da177e4 LT |
442 | } |
443 | ||
46994191 | 444 | dump_zones(mddev); |
0366ef84 | 445 | |
446 | ret = md_integrity_register(mddev); | |
0366ef84 | 447 | |
448 | return ret; | |
1da177e4 LT |
449 | } |
450 | ||
afa0f557 | 451 | static void raid0_free(struct mddev *mddev, void *priv) |
1da177e4 | 452 | { |
afa0f557 | 453 | struct r0conf *conf = priv; |
1da177e4 | 454 | |
990a8baf | 455 | kfree(conf->strip_zone); |
fb5ab4b5 | 456 | kfree(conf->devlist); |
990a8baf | 457 | kfree(conf); |
1da177e4 LT |
458 | } |
459 | ||
fbb704ef | 460 | /* |
461 | * Is io distribute over 1 or more chunks ? | |
462 | */ | |
fd01b88c | 463 | static inline int is_io_in_chunk_boundary(struct mddev *mddev, |
fbb704ef | 464 | unsigned int chunk_sects, struct bio *bio) |
465 | { | |
d6e412ea | 466 | if (likely(is_power_of_2(chunk_sects))) { |
4f024f37 KO |
467 | return chunk_sects >= |
468 | ((bio->bi_iter.bi_sector & (chunk_sects-1)) | |
aa8b57aa | 469 | + bio_sectors(bio)); |
fbb704ef | 470 | } else{ |
4f024f37 | 471 | sector_t sector = bio->bi_iter.bi_sector; |
fbb704ef | 472 | return chunk_sects >= (sector_div(sector, chunk_sects) |
aa8b57aa | 473 | + bio_sectors(bio)); |
fbb704ef | 474 | } |
475 | } | |
476 | ||
29efc390 SL |
477 | static void raid0_handle_discard(struct mddev *mddev, struct bio *bio) |
478 | { | |
479 | struct r0conf *conf = mddev->private; | |
480 | struct strip_zone *zone; | |
481 | sector_t start = bio->bi_iter.bi_sector; | |
482 | sector_t end; | |
483 | unsigned int stripe_size; | |
484 | sector_t first_stripe_index, last_stripe_index; | |
485 | sector_t start_disk_offset; | |
486 | unsigned int start_disk_index; | |
487 | sector_t end_disk_offset; | |
488 | unsigned int end_disk_index; | |
489 | unsigned int disk; | |
490 | ||
491 | zone = find_zone(conf, &start); | |
492 | ||
493 | if (bio_end_sector(bio) > zone->zone_end) { | |
494 | struct bio *split = bio_split(bio, | |
495 | zone->zone_end - bio->bi_iter.bi_sector, GFP_NOIO, | |
afeee514 | 496 | &mddev->bio_set); |
29efc390 | 497 | bio_chain(split, bio); |
ed00aabd | 498 | submit_bio_noacct(bio); |
29efc390 SL |
499 | bio = split; |
500 | end = zone->zone_end; | |
501 | } else | |
502 | end = bio_end_sector(bio); | |
503 | ||
504 | if (zone != conf->strip_zone) | |
505 | end = end - zone[-1].zone_end; | |
506 | ||
507 | /* Now start and end is the offset in zone */ | |
508 | stripe_size = zone->nb_dev * mddev->chunk_sectors; | |
509 | ||
510 | first_stripe_index = start; | |
511 | sector_div(first_stripe_index, stripe_size); | |
512 | last_stripe_index = end; | |
513 | sector_div(last_stripe_index, stripe_size); | |
514 | ||
515 | start_disk_index = (int)(start - first_stripe_index * stripe_size) / | |
516 | mddev->chunk_sectors; | |
517 | start_disk_offset = ((int)(start - first_stripe_index * stripe_size) % | |
518 | mddev->chunk_sectors) + | |
519 | first_stripe_index * mddev->chunk_sectors; | |
520 | end_disk_index = (int)(end - last_stripe_index * stripe_size) / | |
521 | mddev->chunk_sectors; | |
522 | end_disk_offset = ((int)(end - last_stripe_index * stripe_size) % | |
523 | mddev->chunk_sectors) + | |
524 | last_stripe_index * mddev->chunk_sectors; | |
525 | ||
526 | for (disk = 0; disk < zone->nb_dev; disk++) { | |
527 | sector_t dev_start, dev_end; | |
528 | struct bio *discard_bio = NULL; | |
529 | struct md_rdev *rdev; | |
530 | ||
531 | if (disk < start_disk_index) | |
532 | dev_start = (first_stripe_index + 1) * | |
533 | mddev->chunk_sectors; | |
534 | else if (disk > start_disk_index) | |
535 | dev_start = first_stripe_index * mddev->chunk_sectors; | |
536 | else | |
537 | dev_start = start_disk_offset; | |
538 | ||
539 | if (disk < end_disk_index) | |
540 | dev_end = (last_stripe_index + 1) * mddev->chunk_sectors; | |
541 | else if (disk > end_disk_index) | |
542 | dev_end = last_stripe_index * mddev->chunk_sectors; | |
543 | else | |
544 | dev_end = end_disk_offset; | |
545 | ||
546 | if (dev_end <= dev_start) | |
547 | continue; | |
548 | ||
549 | rdev = conf->devlist[(zone - conf->strip_zone) * | |
550 | conf->strip_zone[0].nb_dev + disk]; | |
551 | if (__blkdev_issue_discard(rdev->bdev, | |
552 | dev_start + zone->dev_start + rdev->data_offset, | |
553 | dev_end - dev_start, GFP_NOIO, 0, &discard_bio) || | |
554 | !discard_bio) | |
555 | continue; | |
556 | bio_chain(discard_bio, bio); | |
db6638d7 | 557 | bio_clone_blkg_association(discard_bio, bio); |
29efc390 SL |
558 | if (mddev->gendisk) |
559 | trace_block_bio_remap(bdev_get_queue(rdev->bdev), | |
560 | discard_bio, disk_devt(mddev->gendisk), | |
561 | bio->bi_iter.bi_sector); | |
ed00aabd | 562 | submit_bio_noacct(discard_bio); |
29efc390 SL |
563 | } |
564 | bio_endio(bio); | |
565 | } | |
566 | ||
cc27b0c7 | 567 | static bool raid0_make_request(struct mddev *mddev, struct bio *bio) |
fbb704ef | 568 | { |
c84a1372 | 569 | struct r0conf *conf = mddev->private; |
1da177e4 | 570 | struct strip_zone *zone; |
3cb03002 | 571 | struct md_rdev *tmp_dev; |
f00d7c85 N |
572 | sector_t bio_sector; |
573 | sector_t sector; | |
c84a1372 | 574 | sector_t orig_sector; |
f00d7c85 N |
575 | unsigned chunk_sects; |
576 | unsigned sectors; | |
1da177e4 | 577 | |
775d7831 DJ |
578 | if (unlikely(bio->bi_opf & REQ_PREFLUSH) |
579 | && md_flush_request(mddev, bio)) | |
cc27b0c7 | 580 | return true; |
e5dcdd80 | 581 | |
29efc390 SL |
582 | if (unlikely((bio_op(bio) == REQ_OP_DISCARD))) { |
583 | raid0_handle_discard(mddev, bio); | |
cc27b0c7 | 584 | return true; |
29efc390 SL |
585 | } |
586 | ||
f00d7c85 N |
587 | bio_sector = bio->bi_iter.bi_sector; |
588 | sector = bio_sector; | |
589 | chunk_sects = mddev->chunk_sectors; | |
20d0189b | 590 | |
f00d7c85 N |
591 | sectors = chunk_sects - |
592 | (likely(is_power_of_2(chunk_sects)) | |
593 | ? (sector & (chunk_sects-1)) | |
594 | : sector_div(sector, chunk_sects)); | |
20d0189b | 595 | |
f00d7c85 N |
596 | /* Restore due to sector_div */ |
597 | sector = bio_sector; | |
a8115776 | 598 | |
f00d7c85 | 599 | if (sectors < bio_sectors(bio)) { |
afeee514 KO |
600 | struct bio *split = bio_split(bio, sectors, GFP_NOIO, |
601 | &mddev->bio_set); | |
f00d7c85 | 602 | bio_chain(split, bio); |
ed00aabd | 603 | submit_bio_noacct(bio); |
f00d7c85 N |
604 | bio = split; |
605 | } | |
1da177e4 | 606 | |
c84a1372 | 607 | orig_sector = sector; |
f00d7c85 | 608 | zone = find_zone(mddev->private, §or); |
c84a1372 N |
609 | switch (conf->layout) { |
610 | case RAID0_ORIG_LAYOUT: | |
611 | tmp_dev = map_sector(mddev, zone, orig_sector, §or); | |
612 | break; | |
613 | case RAID0_ALT_MULTIZONE_LAYOUT: | |
614 | tmp_dev = map_sector(mddev, zone, sector, §or); | |
615 | break; | |
616 | default: | |
e3fc3f3d | 617 | WARN(1, "md/raid0:%s: Invalid layout\n", mdname(mddev)); |
c84a1372 N |
618 | bio_io_error(bio); |
619 | return true; | |
620 | } | |
62f7b198 GP |
621 | |
622 | if (unlikely(is_mddev_broken(tmp_dev, "raid0"))) { | |
623 | bio_io_error(bio); | |
624 | return true; | |
625 | } | |
626 | ||
74d46992 | 627 | bio_set_dev(bio, tmp_dev->bdev); |
f00d7c85 N |
628 | bio->bi_iter.bi_sector = sector + zone->dev_start + |
629 | tmp_dev->data_offset; | |
630 | ||
29efc390 | 631 | if (mddev->gendisk) |
74d46992 CH |
632 | trace_block_bio_remap(bio->bi_disk->queue, bio, |
633 | disk_devt(mddev->gendisk), bio_sector); | |
29efc390 SL |
634 | mddev_check_writesame(mddev, bio); |
635 | mddev_check_write_zeroes(mddev, bio); | |
ed00aabd | 636 | submit_bio_noacct(bio); |
cc27b0c7 | 637 | return true; |
1da177e4 | 638 | } |
8299d7f7 | 639 | |
fd01b88c | 640 | static void raid0_status(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 641 | { |
9d8f0363 | 642 | seq_printf(seq, " %dk chunks", mddev->chunk_sectors / 2); |
1da177e4 LT |
643 | return; |
644 | } | |
645 | ||
fd01b88c | 646 | static void *raid0_takeover_raid45(struct mddev *mddev) |
9af204cf | 647 | { |
3cb03002 | 648 | struct md_rdev *rdev; |
e373ab10 | 649 | struct r0conf *priv_conf; |
9af204cf TM |
650 | |
651 | if (mddev->degraded != 1) { | |
76603884 N |
652 | pr_warn("md/raid0:%s: raid5 must be degraded! Degraded disks: %d\n", |
653 | mdname(mddev), | |
654 | mddev->degraded); | |
9af204cf TM |
655 | return ERR_PTR(-EINVAL); |
656 | } | |
657 | ||
dafb20fa | 658 | rdev_for_each(rdev, mddev) { |
9af204cf TM |
659 | /* check slot number for a disk */ |
660 | if (rdev->raid_disk == mddev->raid_disks-1) { | |
76603884 N |
661 | pr_warn("md/raid0:%s: raid5 must have missing parity disk!\n", |
662 | mdname(mddev)); | |
9af204cf TM |
663 | return ERR_PTR(-EINVAL); |
664 | } | |
eea136d6 | 665 | rdev->sectors = mddev->dev_sectors; |
9af204cf TM |
666 | } |
667 | ||
668 | /* Set new parameters */ | |
669 | mddev->new_level = 0; | |
001048a3 | 670 | mddev->new_layout = 0; |
9af204cf TM |
671 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
672 | mddev->raid_disks--; | |
673 | mddev->delta_disks = -1; | |
674 | /* make sure it will be not marked as dirty */ | |
675 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 676 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
677 | |
678 | create_strip_zones(mddev, &priv_conf); | |
6995f0b2 | 679 | |
9af204cf TM |
680 | return priv_conf; |
681 | } | |
682 | ||
fd01b88c | 683 | static void *raid0_takeover_raid10(struct mddev *mddev) |
9af204cf | 684 | { |
e373ab10 | 685 | struct r0conf *priv_conf; |
9af204cf TM |
686 | |
687 | /* Check layout: | |
688 | * - far_copies must be 1 | |
689 | * - near_copies must be 2 | |
690 | * - disks number must be even | |
691 | * - all mirrors must be already degraded | |
692 | */ | |
693 | if (mddev->layout != ((1 << 8) + 2)) { | |
76603884 N |
694 | pr_warn("md/raid0:%s:: Raid0 cannot takeover layout: 0x%x\n", |
695 | mdname(mddev), | |
696 | mddev->layout); | |
9af204cf TM |
697 | return ERR_PTR(-EINVAL); |
698 | } | |
699 | if (mddev->raid_disks & 1) { | |
76603884 N |
700 | pr_warn("md/raid0:%s: Raid0 cannot takeover Raid10 with odd disk number.\n", |
701 | mdname(mddev)); | |
9af204cf TM |
702 | return ERR_PTR(-EINVAL); |
703 | } | |
704 | if (mddev->degraded != (mddev->raid_disks>>1)) { | |
76603884 N |
705 | pr_warn("md/raid0:%s: All mirrors must be already degraded!\n", |
706 | mdname(mddev)); | |
9af204cf TM |
707 | return ERR_PTR(-EINVAL); |
708 | } | |
709 | ||
710 | /* Set new parameters */ | |
711 | mddev->new_level = 0; | |
001048a3 | 712 | mddev->new_layout = 0; |
9af204cf TM |
713 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
714 | mddev->delta_disks = - mddev->raid_disks / 2; | |
715 | mddev->raid_disks += mddev->delta_disks; | |
716 | mddev->degraded = 0; | |
717 | /* make sure it will be not marked as dirty */ | |
718 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 719 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
9af204cf TM |
720 | |
721 | create_strip_zones(mddev, &priv_conf); | |
9af204cf TM |
722 | return priv_conf; |
723 | } | |
724 | ||
fd01b88c | 725 | static void *raid0_takeover_raid1(struct mddev *mddev) |
fc3a08b8 | 726 | { |
e373ab10 | 727 | struct r0conf *priv_conf; |
24b961f8 | 728 | int chunksect; |
fc3a08b8 KW |
729 | |
730 | /* Check layout: | |
731 | * - (N - 1) mirror drives must be already faulty | |
732 | */ | |
733 | if ((mddev->raid_disks - 1) != mddev->degraded) { | |
76603884 | 734 | pr_err("md/raid0:%s: (N - 1) mirrors drives must be already faulty!\n", |
fc3a08b8 KW |
735 | mdname(mddev)); |
736 | return ERR_PTR(-EINVAL); | |
737 | } | |
738 | ||
24b961f8 JS |
739 | /* |
740 | * a raid1 doesn't have the notion of chunk size, so | |
741 | * figure out the largest suitable size we can use. | |
742 | */ | |
743 | chunksect = 64 * 2; /* 64K by default */ | |
744 | ||
745 | /* The array must be an exact multiple of chunksize */ | |
746 | while (chunksect && (mddev->array_sectors & (chunksect - 1))) | |
747 | chunksect >>= 1; | |
748 | ||
749 | if ((chunksect << 9) < PAGE_SIZE) | |
750 | /* array size does not allow a suitable chunk size */ | |
751 | return ERR_PTR(-EINVAL); | |
752 | ||
fc3a08b8 KW |
753 | /* Set new parameters */ |
754 | mddev->new_level = 0; | |
755 | mddev->new_layout = 0; | |
24b961f8 JS |
756 | mddev->new_chunk_sectors = chunksect; |
757 | mddev->chunk_sectors = chunksect; | |
fc3a08b8 | 758 | mddev->delta_disks = 1 - mddev->raid_disks; |
f7bee809 | 759 | mddev->raid_disks = 1; |
fc3a08b8 KW |
760 | /* make sure it will be not marked as dirty */ |
761 | mddev->recovery_cp = MaxSector; | |
394ed8e4 | 762 | mddev_clear_unsupported_flags(mddev, UNSUPPORTED_MDDEV_FLAGS); |
fc3a08b8 KW |
763 | |
764 | create_strip_zones(mddev, &priv_conf); | |
765 | return priv_conf; | |
766 | } | |
767 | ||
fd01b88c | 768 | static void *raid0_takeover(struct mddev *mddev) |
9af204cf TM |
769 | { |
770 | /* raid0 can take over: | |
049d6c1e | 771 | * raid4 - if all data disks are active. |
9af204cf TM |
772 | * raid5 - providing it is Raid4 layout and one disk is faulty |
773 | * raid10 - assuming we have all necessary active disks | |
fc3a08b8 | 774 | * raid1 - with (N -1) mirror drives faulty |
9af204cf | 775 | */ |
a8461a61 N |
776 | |
777 | if (mddev->bitmap) { | |
76603884 N |
778 | pr_warn("md/raid0: %s: cannot takeover array with bitmap\n", |
779 | mdname(mddev)); | |
a8461a61 N |
780 | return ERR_PTR(-EBUSY); |
781 | } | |
049d6c1e MT |
782 | if (mddev->level == 4) |
783 | return raid0_takeover_raid45(mddev); | |
784 | ||
9af204cf TM |
785 | if (mddev->level == 5) { |
786 | if (mddev->layout == ALGORITHM_PARITY_N) | |
049d6c1e | 787 | return raid0_takeover_raid45(mddev); |
9af204cf | 788 | |
76603884 N |
789 | pr_warn("md/raid0:%s: Raid can only takeover Raid5 with layout: %d\n", |
790 | mdname(mddev), ALGORITHM_PARITY_N); | |
9af204cf TM |
791 | } |
792 | ||
793 | if (mddev->level == 10) | |
794 | return raid0_takeover_raid10(mddev); | |
795 | ||
fc3a08b8 KW |
796 | if (mddev->level == 1) |
797 | return raid0_takeover_raid1(mddev); | |
798 | ||
76603884 | 799 | pr_warn("Takeover from raid%i to raid0 not supported\n", |
fc3a08b8 KW |
800 | mddev->level); |
801 | ||
9af204cf TM |
802 | return ERR_PTR(-EINVAL); |
803 | } | |
804 | ||
b03e0ccb | 805 | static void raid0_quiesce(struct mddev *mddev, int quiesce) |
9af204cf TM |
806 | { |
807 | } | |
808 | ||
84fc4b56 | 809 | static struct md_personality raid0_personality= |
1da177e4 LT |
810 | { |
811 | .name = "raid0", | |
2604b703 | 812 | .level = 0, |
1da177e4 LT |
813 | .owner = THIS_MODULE, |
814 | .make_request = raid0_make_request, | |
815 | .run = raid0_run, | |
afa0f557 | 816 | .free = raid0_free, |
1da177e4 | 817 | .status = raid0_status, |
80c3a6ce | 818 | .size = raid0_size, |
9af204cf TM |
819 | .takeover = raid0_takeover, |
820 | .quiesce = raid0_quiesce, | |
5c675f83 | 821 | .congested = raid0_congested, |
1da177e4 LT |
822 | }; |
823 | ||
824 | static int __init raid0_init (void) | |
825 | { | |
2604b703 | 826 | return register_md_personality (&raid0_personality); |
1da177e4 LT |
827 | } |
828 | ||
829 | static void raid0_exit (void) | |
830 | { | |
2604b703 | 831 | unregister_md_personality (&raid0_personality); |
1da177e4 LT |
832 | } |
833 | ||
834 | module_init(raid0_init); | |
835 | module_exit(raid0_exit); | |
836 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 837 | MODULE_DESCRIPTION("RAID0 (striping) personality for MD"); |
1da177e4 | 838 | MODULE_ALIAS("md-personality-2"); /* RAID0 */ |
d9d166c2 | 839 | MODULE_ALIAS("md-raid0"); |
2604b703 | 840 | MODULE_ALIAS("md-level-0"); |