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bae9a0aa | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3b1a94c8 DLM |
2 | /* |
3 | * Copyright (C) 2017 Western Digital Corporation or its affiliates. | |
4 | * | |
5 | * This file is released under the GPL. | |
6 | */ | |
7 | ||
8 | #include "dm-zoned.h" | |
9 | ||
10 | #include <linux/module.h> | |
11 | ||
12 | #define DM_MSG_PREFIX "zoned" | |
13 | ||
14 | #define DMZ_MIN_BIOS 8192 | |
15 | ||
16 | /* | |
17 | * Zone BIO context. | |
18 | */ | |
19 | struct dmz_bioctx { | |
52d67758 | 20 | struct dmz_dev *dev; |
3b1a94c8 DLM |
21 | struct dm_zone *zone; |
22 | struct bio *bio; | |
092b5648 | 23 | refcount_t ref; |
3b1a94c8 DLM |
24 | }; |
25 | ||
26 | /* | |
27 | * Chunk work descriptor. | |
28 | */ | |
29 | struct dm_chunk_work { | |
30 | struct work_struct work; | |
092b5648 | 31 | refcount_t refcount; |
3b1a94c8 DLM |
32 | struct dmz_target *target; |
33 | unsigned int chunk; | |
34 | struct bio_list bio_list; | |
35 | }; | |
36 | ||
37 | /* | |
38 | * Target descriptor. | |
39 | */ | |
40 | struct dmz_target { | |
4dba1288 | 41 | struct dm_dev **ddev; |
f97809ae | 42 | unsigned int nr_ddevs; |
3b1a94c8 | 43 | |
4dba1288 | 44 | unsigned int flags; |
3b1a94c8 DLM |
45 | |
46 | /* Zoned block device information */ | |
47 | struct dmz_dev *dev; | |
48 | ||
49 | /* For metadata handling */ | |
50 | struct dmz_metadata *metadata; | |
51 | ||
3b1a94c8 | 52 | /* For chunk work */ |
3b1a94c8 DLM |
53 | struct radix_tree_root chunk_rxtree; |
54 | struct workqueue_struct *chunk_wq; | |
72d711c8 | 55 | struct mutex chunk_lock; |
3b1a94c8 DLM |
56 | |
57 | /* For cloned BIOs to zones */ | |
6f1c819c | 58 | struct bio_set bio_set; |
3b1a94c8 DLM |
59 | |
60 | /* For flush */ | |
61 | spinlock_t flush_lock; | |
62 | struct bio_list flush_list; | |
63 | struct delayed_work flush_work; | |
64 | struct workqueue_struct *flush_wq; | |
65 | }; | |
66 | ||
67 | /* | |
68 | * Flush intervals (seconds). | |
69 | */ | |
70 | #define DMZ_FLUSH_PERIOD (10 * HZ) | |
71 | ||
72 | /* | |
73 | * Target BIO completion. | |
74 | */ | |
75 | static inline void dmz_bio_endio(struct bio *bio, blk_status_t status) | |
76 | { | |
52d67758 HR |
77 | struct dmz_bioctx *bioctx = |
78 | dm_per_bio_data(bio, sizeof(struct dmz_bioctx)); | |
3b1a94c8 | 79 | |
d57f9da8 DLM |
80 | if (status != BLK_STS_OK && bio->bi_status == BLK_STS_OK) |
81 | bio->bi_status = status; | |
bd5c4031 | 82 | if (bioctx->dev && bio->bi_status != BLK_STS_OK) |
52d67758 | 83 | bioctx->dev->flags |= DMZ_CHECK_BDEV; |
d57f9da8 DLM |
84 | |
85 | if (refcount_dec_and_test(&bioctx->ref)) { | |
86 | struct dm_zone *zone = bioctx->zone; | |
87 | ||
88 | if (zone) { | |
89 | if (bio->bi_status != BLK_STS_OK && | |
90 | bio_op(bio) == REQ_OP_WRITE && | |
91 | dmz_is_seq(zone)) | |
92 | set_bit(DMZ_SEQ_WRITE_ERR, &zone->flags); | |
93 | dmz_deactivate_zone(zone); | |
94 | } | |
95 | bio_endio(bio); | |
96 | } | |
3b1a94c8 DLM |
97 | } |
98 | ||
99 | /* | |
d57f9da8 | 100 | * Completion callback for an internally cloned target BIO. This terminates the |
3b1a94c8 DLM |
101 | * target BIO when there are no more references to its context. |
102 | */ | |
d57f9da8 | 103 | static void dmz_clone_endio(struct bio *clone) |
3b1a94c8 | 104 | { |
d57f9da8 DLM |
105 | struct dmz_bioctx *bioctx = clone->bi_private; |
106 | blk_status_t status = clone->bi_status; | |
3b1a94c8 | 107 | |
d57f9da8 | 108 | bio_put(clone); |
3b1a94c8 DLM |
109 | dmz_bio_endio(bioctx->bio, status); |
110 | } | |
111 | ||
112 | /* | |
d57f9da8 | 113 | * Issue a clone of a target BIO. The clone may only partially process the |
3b1a94c8 DLM |
114 | * original target BIO. |
115 | */ | |
d57f9da8 DLM |
116 | static int dmz_submit_bio(struct dmz_target *dmz, struct dm_zone *zone, |
117 | struct bio *bio, sector_t chunk_block, | |
118 | unsigned int nr_blocks) | |
3b1a94c8 | 119 | { |
52d67758 HR |
120 | struct dmz_bioctx *bioctx = |
121 | dm_per_bio_data(bio, sizeof(struct dmz_bioctx)); | |
8f22272a | 122 | struct dmz_dev *dev = zone->dev; |
3b1a94c8 DLM |
123 | struct bio *clone; |
124 | ||
52d67758 HR |
125 | if (dev->flags & DMZ_BDEV_DYING) |
126 | return -EIO; | |
127 | ||
abfc426d | 128 | clone = bio_alloc_clone(dev->bdev, bio, GFP_NOIO, &dmz->bio_set); |
3b1a94c8 DLM |
129 | if (!clone) |
130 | return -ENOMEM; | |
131 | ||
52d67758 | 132 | bioctx->dev = dev; |
d57f9da8 DLM |
133 | clone->bi_iter.bi_sector = |
134 | dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block); | |
3b1a94c8 | 135 | clone->bi_iter.bi_size = dmz_blk2sect(nr_blocks) << SECTOR_SHIFT; |
d57f9da8 | 136 | clone->bi_end_io = dmz_clone_endio; |
3b1a94c8 DLM |
137 | clone->bi_private = bioctx; |
138 | ||
139 | bio_advance(bio, clone->bi_iter.bi_size); | |
140 | ||
092b5648 | 141 | refcount_inc(&bioctx->ref); |
ed00aabd | 142 | submit_bio_noacct(clone); |
3b1a94c8 | 143 | |
d57f9da8 DLM |
144 | if (bio_op(bio) == REQ_OP_WRITE && dmz_is_seq(zone)) |
145 | zone->wp_block += nr_blocks; | |
146 | ||
3b1a94c8 DLM |
147 | return 0; |
148 | } | |
149 | ||
150 | /* | |
151 | * Zero out pages of discarded blocks accessed by a read BIO. | |
152 | */ | |
153 | static void dmz_handle_read_zero(struct dmz_target *dmz, struct bio *bio, | |
154 | sector_t chunk_block, unsigned int nr_blocks) | |
155 | { | |
156 | unsigned int size = nr_blocks << DMZ_BLOCK_SHIFT; | |
157 | ||
158 | /* Clear nr_blocks */ | |
159 | swap(bio->bi_iter.bi_size, size); | |
160 | zero_fill_bio(bio); | |
161 | swap(bio->bi_iter.bi_size, size); | |
162 | ||
163 | bio_advance(bio, size); | |
164 | } | |
165 | ||
166 | /* | |
167 | * Process a read BIO. | |
168 | */ | |
169 | static int dmz_handle_read(struct dmz_target *dmz, struct dm_zone *zone, | |
170 | struct bio *bio) | |
171 | { | |
36820560 HR |
172 | struct dmz_metadata *zmd = dmz->metadata; |
173 | sector_t chunk_block = dmz_chunk_block(zmd, dmz_bio_block(bio)); | |
3b1a94c8 DLM |
174 | unsigned int nr_blocks = dmz_bio_blocks(bio); |
175 | sector_t end_block = chunk_block + nr_blocks; | |
176 | struct dm_zone *rzone, *bzone; | |
177 | int ret; | |
178 | ||
179 | /* Read into unmapped chunks need only zeroing the BIO buffer */ | |
180 | if (!zone) { | |
181 | zero_fill_bio(bio); | |
182 | return 0; | |
183 | } | |
184 | ||
2234e732 HR |
185 | DMDEBUG("(%s): READ chunk %llu -> %s zone %u, block %llu, %u blocks", |
186 | dmz_metadata_label(zmd), | |
187 | (unsigned long long)dmz_bio_chunk(zmd, bio), | |
34f5affd HR |
188 | (dmz_is_rnd(zone) ? "RND" : |
189 | (dmz_is_cache(zone) ? "CACHE" : "SEQ")), | |
2234e732 HR |
190 | zone->id, |
191 | (unsigned long long)chunk_block, nr_blocks); | |
3b1a94c8 DLM |
192 | |
193 | /* Check block validity to determine the read location */ | |
194 | bzone = zone->bzone; | |
195 | while (chunk_block < end_block) { | |
196 | nr_blocks = 0; | |
34f5affd HR |
197 | if (dmz_is_rnd(zone) || dmz_is_cache(zone) || |
198 | chunk_block < zone->wp_block) { | |
3b1a94c8 | 199 | /* Test block validity in the data zone */ |
36820560 | 200 | ret = dmz_block_valid(zmd, zone, chunk_block); |
3b1a94c8 DLM |
201 | if (ret < 0) |
202 | return ret; | |
203 | if (ret > 0) { | |
204 | /* Read data zone blocks */ | |
205 | nr_blocks = ret; | |
206 | rzone = zone; | |
207 | } | |
208 | } | |
209 | ||
210 | /* | |
211 | * No valid blocks found in the data zone. | |
212 | * Check the buffer zone, if there is one. | |
213 | */ | |
214 | if (!nr_blocks && bzone) { | |
36820560 | 215 | ret = dmz_block_valid(zmd, bzone, chunk_block); |
3b1a94c8 DLM |
216 | if (ret < 0) |
217 | return ret; | |
218 | if (ret > 0) { | |
219 | /* Read buffer zone blocks */ | |
220 | nr_blocks = ret; | |
221 | rzone = bzone; | |
222 | } | |
223 | } | |
224 | ||
225 | if (nr_blocks) { | |
226 | /* Valid blocks found: read them */ | |
52d67758 HR |
227 | nr_blocks = min_t(unsigned int, nr_blocks, |
228 | end_block - chunk_block); | |
229 | ret = dmz_submit_bio(dmz, rzone, bio, | |
230 | chunk_block, nr_blocks); | |
3b1a94c8 DLM |
231 | if (ret) |
232 | return ret; | |
233 | chunk_block += nr_blocks; | |
234 | } else { | |
235 | /* No valid block: zeroout the current BIO block */ | |
236 | dmz_handle_read_zero(dmz, bio, chunk_block, 1); | |
237 | chunk_block++; | |
238 | } | |
239 | } | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
3b1a94c8 DLM |
244 | /* |
245 | * Write blocks directly in a data zone, at the write pointer. | |
246 | * If a buffer zone is assigned, invalidate the blocks written | |
247 | * in place. | |
248 | */ | |
249 | static int dmz_handle_direct_write(struct dmz_target *dmz, | |
250 | struct dm_zone *zone, struct bio *bio, | |
251 | sector_t chunk_block, | |
252 | unsigned int nr_blocks) | |
253 | { | |
254 | struct dmz_metadata *zmd = dmz->metadata; | |
255 | struct dm_zone *bzone = zone->bzone; | |
256 | int ret; | |
257 | ||
258 | if (dmz_is_readonly(zone)) | |
259 | return -EROFS; | |
260 | ||
261 | /* Submit write */ | |
d57f9da8 DLM |
262 | ret = dmz_submit_bio(dmz, zone, bio, chunk_block, nr_blocks); |
263 | if (ret) | |
264 | return ret; | |
3b1a94c8 DLM |
265 | |
266 | /* | |
267 | * Validate the blocks in the data zone and invalidate | |
268 | * in the buffer zone, if there is one. | |
269 | */ | |
270 | ret = dmz_validate_blocks(zmd, zone, chunk_block, nr_blocks); | |
271 | if (ret == 0 && bzone) | |
272 | ret = dmz_invalidate_blocks(zmd, bzone, chunk_block, nr_blocks); | |
273 | ||
274 | return ret; | |
275 | } | |
276 | ||
277 | /* | |
278 | * Write blocks in the buffer zone of @zone. | |
279 | * If no buffer zone is assigned yet, get one. | |
280 | * Called with @zone write locked. | |
281 | */ | |
282 | static int dmz_handle_buffered_write(struct dmz_target *dmz, | |
283 | struct dm_zone *zone, struct bio *bio, | |
284 | sector_t chunk_block, | |
285 | unsigned int nr_blocks) | |
286 | { | |
287 | struct dmz_metadata *zmd = dmz->metadata; | |
288 | struct dm_zone *bzone; | |
289 | int ret; | |
290 | ||
291 | /* Get the buffer zone. One will be allocated if needed */ | |
292 | bzone = dmz_get_chunk_buffer(zmd, zone); | |
75d66ffb DF |
293 | if (IS_ERR(bzone)) |
294 | return PTR_ERR(bzone); | |
3b1a94c8 DLM |
295 | |
296 | if (dmz_is_readonly(bzone)) | |
297 | return -EROFS; | |
298 | ||
299 | /* Submit write */ | |
d57f9da8 DLM |
300 | ret = dmz_submit_bio(dmz, bzone, bio, chunk_block, nr_blocks); |
301 | if (ret) | |
302 | return ret; | |
3b1a94c8 DLM |
303 | |
304 | /* | |
305 | * Validate the blocks in the buffer zone | |
306 | * and invalidate in the data zone. | |
307 | */ | |
308 | ret = dmz_validate_blocks(zmd, bzone, chunk_block, nr_blocks); | |
309 | if (ret == 0 && chunk_block < zone->wp_block) | |
310 | ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks); | |
311 | ||
312 | return ret; | |
313 | } | |
314 | ||
315 | /* | |
316 | * Process a write BIO. | |
317 | */ | |
318 | static int dmz_handle_write(struct dmz_target *dmz, struct dm_zone *zone, | |
319 | struct bio *bio) | |
320 | { | |
36820560 HR |
321 | struct dmz_metadata *zmd = dmz->metadata; |
322 | sector_t chunk_block = dmz_chunk_block(zmd, dmz_bio_block(bio)); | |
3b1a94c8 DLM |
323 | unsigned int nr_blocks = dmz_bio_blocks(bio); |
324 | ||
325 | if (!zone) | |
326 | return -ENOSPC; | |
327 | ||
2234e732 HR |
328 | DMDEBUG("(%s): WRITE chunk %llu -> %s zone %u, block %llu, %u blocks", |
329 | dmz_metadata_label(zmd), | |
330 | (unsigned long long)dmz_bio_chunk(zmd, bio), | |
34f5affd HR |
331 | (dmz_is_rnd(zone) ? "RND" : |
332 | (dmz_is_cache(zone) ? "CACHE" : "SEQ")), | |
2234e732 HR |
333 | zone->id, |
334 | (unsigned long long)chunk_block, nr_blocks); | |
3b1a94c8 | 335 | |
34f5affd HR |
336 | if (dmz_is_rnd(zone) || dmz_is_cache(zone) || |
337 | chunk_block == zone->wp_block) { | |
3b1a94c8 DLM |
338 | /* |
339 | * zone is a random zone or it is a sequential zone | |
340 | * and the BIO is aligned to the zone write pointer: | |
341 | * direct write the zone. | |
342 | */ | |
52d67758 HR |
343 | return dmz_handle_direct_write(dmz, zone, bio, |
344 | chunk_block, nr_blocks); | |
3b1a94c8 DLM |
345 | } |
346 | ||
347 | /* | |
348 | * This is an unaligned write in a sequential zone: | |
349 | * use buffered write. | |
350 | */ | |
351 | return dmz_handle_buffered_write(dmz, zone, bio, chunk_block, nr_blocks); | |
352 | } | |
353 | ||
354 | /* | |
355 | * Process a discard BIO. | |
356 | */ | |
357 | static int dmz_handle_discard(struct dmz_target *dmz, struct dm_zone *zone, | |
358 | struct bio *bio) | |
359 | { | |
360 | struct dmz_metadata *zmd = dmz->metadata; | |
361 | sector_t block = dmz_bio_block(bio); | |
362 | unsigned int nr_blocks = dmz_bio_blocks(bio); | |
36820560 | 363 | sector_t chunk_block = dmz_chunk_block(zmd, block); |
3b1a94c8 DLM |
364 | int ret = 0; |
365 | ||
366 | /* For unmapped chunks, there is nothing to do */ | |
367 | if (!zone) | |
368 | return 0; | |
369 | ||
370 | if (dmz_is_readonly(zone)) | |
371 | return -EROFS; | |
372 | ||
2234e732 HR |
373 | DMDEBUG("(%s): DISCARD chunk %llu -> zone %u, block %llu, %u blocks", |
374 | dmz_metadata_label(dmz->metadata), | |
375 | (unsigned long long)dmz_bio_chunk(zmd, bio), | |
376 | zone->id, | |
377 | (unsigned long long)chunk_block, nr_blocks); | |
3b1a94c8 DLM |
378 | |
379 | /* | |
380 | * Invalidate blocks in the data zone and its | |
381 | * buffer zone if one is mapped. | |
382 | */ | |
34f5affd HR |
383 | if (dmz_is_rnd(zone) || dmz_is_cache(zone) || |
384 | chunk_block < zone->wp_block) | |
3b1a94c8 DLM |
385 | ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks); |
386 | if (ret == 0 && zone->bzone) | |
387 | ret = dmz_invalidate_blocks(zmd, zone->bzone, | |
388 | chunk_block, nr_blocks); | |
389 | return ret; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Process a BIO. | |
394 | */ | |
395 | static void dmz_handle_bio(struct dmz_target *dmz, struct dm_chunk_work *cw, | |
396 | struct bio *bio) | |
397 | { | |
52d67758 HR |
398 | struct dmz_bioctx *bioctx = |
399 | dm_per_bio_data(bio, sizeof(struct dmz_bioctx)); | |
3b1a94c8 DLM |
400 | struct dmz_metadata *zmd = dmz->metadata; |
401 | struct dm_zone *zone; | |
174364f6 | 402 | int ret; |
3b1a94c8 DLM |
403 | |
404 | dmz_lock_metadata(zmd); | |
405 | ||
406 | /* | |
407 | * Get the data zone mapping the chunk. There may be no | |
408 | * mapping for read and discard. If a mapping is obtained, | |
409 | + the zone returned will be set to active state. | |
410 | */ | |
36820560 | 411 | zone = dmz_get_chunk_mapping(zmd, dmz_bio_chunk(zmd, bio), |
3b1a94c8 DLM |
412 | bio_op(bio)); |
413 | if (IS_ERR(zone)) { | |
414 | ret = PTR_ERR(zone); | |
415 | goto out; | |
416 | } | |
417 | ||
418 | /* Process the BIO */ | |
419 | if (zone) { | |
420 | dmz_activate_zone(zone); | |
421 | bioctx->zone = zone; | |
f97809ae | 422 | dmz_reclaim_bio_acc(zone->dev->reclaim); |
3b1a94c8 DLM |
423 | } |
424 | ||
425 | switch (bio_op(bio)) { | |
426 | case REQ_OP_READ: | |
427 | ret = dmz_handle_read(dmz, zone, bio); | |
428 | break; | |
429 | case REQ_OP_WRITE: | |
430 | ret = dmz_handle_write(dmz, zone, bio); | |
431 | break; | |
432 | case REQ_OP_DISCARD: | |
433 | case REQ_OP_WRITE_ZEROES: | |
434 | ret = dmz_handle_discard(dmz, zone, bio); | |
435 | break; | |
436 | default: | |
2234e732 HR |
437 | DMERR("(%s): Unsupported BIO operation 0x%x", |
438 | dmz_metadata_label(dmz->metadata), bio_op(bio)); | |
3b1a94c8 DLM |
439 | ret = -EIO; |
440 | } | |
441 | ||
442 | /* | |
443 | * Release the chunk mapping. This will check that the mapping | |
444 | * is still valid, that is, that the zone used still has valid blocks. | |
445 | */ | |
446 | if (zone) | |
447 | dmz_put_chunk_mapping(zmd, zone); | |
448 | out: | |
449 | dmz_bio_endio(bio, errno_to_blk_status(ret)); | |
450 | ||
451 | dmz_unlock_metadata(zmd); | |
452 | } | |
453 | ||
454 | /* | |
455 | * Increment a chunk reference counter. | |
456 | */ | |
457 | static inline void dmz_get_chunk_work(struct dm_chunk_work *cw) | |
458 | { | |
092b5648 | 459 | refcount_inc(&cw->refcount); |
3b1a94c8 DLM |
460 | } |
461 | ||
462 | /* | |
463 | * Decrement a chunk work reference count and | |
464 | * free it if it becomes 0. | |
465 | */ | |
466 | static void dmz_put_chunk_work(struct dm_chunk_work *cw) | |
467 | { | |
092b5648 | 468 | if (refcount_dec_and_test(&cw->refcount)) { |
3b1a94c8 DLM |
469 | WARN_ON(!bio_list_empty(&cw->bio_list)); |
470 | radix_tree_delete(&cw->target->chunk_rxtree, cw->chunk); | |
471 | kfree(cw); | |
472 | } | |
473 | } | |
474 | ||
475 | /* | |
476 | * Chunk BIO work function. | |
477 | */ | |
478 | static void dmz_chunk_work(struct work_struct *work) | |
479 | { | |
480 | struct dm_chunk_work *cw = container_of(work, struct dm_chunk_work, work); | |
481 | struct dmz_target *dmz = cw->target; | |
482 | struct bio *bio; | |
483 | ||
484 | mutex_lock(&dmz->chunk_lock); | |
485 | ||
486 | /* Process the chunk BIOs */ | |
487 | while ((bio = bio_list_pop(&cw->bio_list))) { | |
488 | mutex_unlock(&dmz->chunk_lock); | |
489 | dmz_handle_bio(dmz, cw, bio); | |
490 | mutex_lock(&dmz->chunk_lock); | |
491 | dmz_put_chunk_work(cw); | |
492 | } | |
493 | ||
494 | /* Queueing the work incremented the work refcount */ | |
495 | dmz_put_chunk_work(cw); | |
496 | ||
497 | mutex_unlock(&dmz->chunk_lock); | |
498 | } | |
499 | ||
500 | /* | |
501 | * Flush work. | |
502 | */ | |
503 | static void dmz_flush_work(struct work_struct *work) | |
504 | { | |
505 | struct dmz_target *dmz = container_of(work, struct dmz_target, flush_work.work); | |
506 | struct bio *bio; | |
507 | int ret; | |
508 | ||
509 | /* Flush dirty metadata blocks */ | |
510 | ret = dmz_flush_metadata(dmz->metadata); | |
75d66ffb | 511 | if (ret) |
49de3b7d | 512 | DMDEBUG("(%s): Metadata flush failed, rc=%d", |
2234e732 | 513 | dmz_metadata_label(dmz->metadata), ret); |
3b1a94c8 DLM |
514 | |
515 | /* Process queued flush requests */ | |
516 | while (1) { | |
517 | spin_lock(&dmz->flush_lock); | |
518 | bio = bio_list_pop(&dmz->flush_list); | |
519 | spin_unlock(&dmz->flush_lock); | |
520 | ||
521 | if (!bio) | |
522 | break; | |
523 | ||
524 | dmz_bio_endio(bio, errno_to_blk_status(ret)); | |
525 | } | |
526 | ||
527 | queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD); | |
528 | } | |
529 | ||
530 | /* | |
531 | * Get a chunk work and start it to process a new BIO. | |
532 | * If the BIO chunk has no work yet, create one. | |
533 | */ | |
d7428c50 | 534 | static int dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio) |
3b1a94c8 | 535 | { |
36820560 | 536 | unsigned int chunk = dmz_bio_chunk(dmz->metadata, bio); |
3b1a94c8 | 537 | struct dm_chunk_work *cw; |
d7428c50 | 538 | int ret = 0; |
3b1a94c8 DLM |
539 | |
540 | mutex_lock(&dmz->chunk_lock); | |
541 | ||
542 | /* Get the BIO chunk work. If one is not active yet, create one */ | |
543 | cw = radix_tree_lookup(&dmz->chunk_rxtree, chunk); | |
ee63634b SK |
544 | if (cw) { |
545 | dmz_get_chunk_work(cw); | |
546 | } else { | |
3b1a94c8 | 547 | /* Create a new chunk work */ |
4218a955 | 548 | cw = kmalloc(sizeof(struct dm_chunk_work), GFP_NOIO); |
d7428c50 DF |
549 | if (unlikely(!cw)) { |
550 | ret = -ENOMEM; | |
3b1a94c8 | 551 | goto out; |
d7428c50 | 552 | } |
3b1a94c8 DLM |
553 | |
554 | INIT_WORK(&cw->work, dmz_chunk_work); | |
ee63634b | 555 | refcount_set(&cw->refcount, 1); |
3b1a94c8 DLM |
556 | cw->target = dmz; |
557 | cw->chunk = chunk; | |
558 | bio_list_init(&cw->bio_list); | |
559 | ||
560 | ret = radix_tree_insert(&dmz->chunk_rxtree, chunk, cw); | |
561 | if (unlikely(ret)) { | |
562 | kfree(cw); | |
3b1a94c8 DLM |
563 | goto out; |
564 | } | |
565 | } | |
566 | ||
567 | bio_list_add(&cw->bio_list, bio); | |
3b1a94c8 DLM |
568 | |
569 | if (queue_work(dmz->chunk_wq, &cw->work)) | |
570 | dmz_get_chunk_work(cw); | |
571 | out: | |
572 | mutex_unlock(&dmz->chunk_lock); | |
d7428c50 | 573 | return ret; |
3b1a94c8 DLM |
574 | } |
575 | ||
75d66ffb | 576 | /* |
e7fad909 | 577 | * Check if the backing device is being removed. If it's on the way out, |
75d66ffb DF |
578 | * start failing I/O. Reclaim and metadata components also call this |
579 | * function to cleanly abort operation in the event of such failure. | |
580 | */ | |
581 | bool dmz_bdev_is_dying(struct dmz_dev *dmz_dev) | |
582 | { | |
e7fad909 DF |
583 | if (dmz_dev->flags & DMZ_BDEV_DYING) |
584 | return true; | |
75d66ffb | 585 | |
e7fad909 DF |
586 | if (dmz_dev->flags & DMZ_CHECK_BDEV) |
587 | return !dmz_check_bdev(dmz_dev); | |
588 | ||
589 | if (blk_queue_dying(bdev_get_queue(dmz_dev->bdev))) { | |
590 | dmz_dev_warn(dmz_dev, "Backing device queue dying"); | |
591 | dmz_dev->flags |= DMZ_BDEV_DYING; | |
75d66ffb DF |
592 | } |
593 | ||
594 | return dmz_dev->flags & DMZ_BDEV_DYING; | |
595 | } | |
596 | ||
e7fad909 DF |
597 | /* |
598 | * Check the backing device availability. This detects such events as | |
599 | * backing device going offline due to errors, media removals, etc. | |
600 | * This check is less efficient than dmz_bdev_is_dying() and should | |
601 | * only be performed as a part of error handling. | |
602 | */ | |
603 | bool dmz_check_bdev(struct dmz_dev *dmz_dev) | |
604 | { | |
605 | struct gendisk *disk; | |
606 | ||
607 | dmz_dev->flags &= ~DMZ_CHECK_BDEV; | |
608 | ||
609 | if (dmz_bdev_is_dying(dmz_dev)) | |
610 | return false; | |
611 | ||
612 | disk = dmz_dev->bdev->bd_disk; | |
613 | if (disk->fops->check_events && | |
614 | disk->fops->check_events(disk, 0) & DISK_EVENT_MEDIA_CHANGE) { | |
615 | dmz_dev_warn(dmz_dev, "Backing device offline"); | |
616 | dmz_dev->flags |= DMZ_BDEV_DYING; | |
617 | } | |
618 | ||
619 | return !(dmz_dev->flags & DMZ_BDEV_DYING); | |
620 | } | |
621 | ||
3b1a94c8 DLM |
622 | /* |
623 | * Process a new BIO. | |
624 | */ | |
625 | static int dmz_map(struct dm_target *ti, struct bio *bio) | |
626 | { | |
627 | struct dmz_target *dmz = ti->private; | |
36820560 | 628 | struct dmz_metadata *zmd = dmz->metadata; |
3b1a94c8 DLM |
629 | struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx)); |
630 | sector_t sector = bio->bi_iter.bi_sector; | |
631 | unsigned int nr_sectors = bio_sectors(bio); | |
632 | sector_t chunk_sector; | |
d7428c50 | 633 | int ret; |
3b1a94c8 | 634 | |
d0e21ce4 | 635 | if (dmz_dev_is_dying(zmd)) |
75d66ffb DF |
636 | return DM_MAPIO_KILL; |
637 | ||
2234e732 HR |
638 | DMDEBUG("(%s): BIO op %d sector %llu + %u => chunk %llu, block %llu, %u blocks", |
639 | dmz_metadata_label(zmd), | |
640 | bio_op(bio), (unsigned long long)sector, nr_sectors, | |
641 | (unsigned long long)dmz_bio_chunk(zmd, bio), | |
642 | (unsigned long long)dmz_chunk_block(zmd, dmz_bio_block(bio)), | |
643 | (unsigned int)dmz_bio_blocks(bio)); | |
3b1a94c8 | 644 | |
edbe9597 | 645 | if (!nr_sectors && bio_op(bio) != REQ_OP_WRITE) |
3b1a94c8 DLM |
646 | return DM_MAPIO_REMAPPED; |
647 | ||
648 | /* The BIO should be block aligned */ | |
649 | if ((nr_sectors & DMZ_BLOCK_SECTORS_MASK) || (sector & DMZ_BLOCK_SECTORS_MASK)) | |
650 | return DM_MAPIO_KILL; | |
651 | ||
652 | /* Initialize the BIO context */ | |
52d67758 | 653 | bioctx->dev = NULL; |
3b1a94c8 DLM |
654 | bioctx->zone = NULL; |
655 | bioctx->bio = bio; | |
092b5648 | 656 | refcount_set(&bioctx->ref, 1); |
3b1a94c8 DLM |
657 | |
658 | /* Set the BIO pending in the flush list */ | |
edbe9597 | 659 | if (!nr_sectors && bio_op(bio) == REQ_OP_WRITE) { |
3b1a94c8 DLM |
660 | spin_lock(&dmz->flush_lock); |
661 | bio_list_add(&dmz->flush_list, bio); | |
662 | spin_unlock(&dmz->flush_lock); | |
663 | mod_delayed_work(dmz->flush_wq, &dmz->flush_work, 0); | |
664 | return DM_MAPIO_SUBMITTED; | |
665 | } | |
666 | ||
667 | /* Split zone BIOs to fit entirely into a zone */ | |
36820560 HR |
668 | chunk_sector = sector & (dmz_zone_nr_sectors(zmd) - 1); |
669 | if (chunk_sector + nr_sectors > dmz_zone_nr_sectors(zmd)) | |
670 | dm_accept_partial_bio(bio, dmz_zone_nr_sectors(zmd) - chunk_sector); | |
3b1a94c8 DLM |
671 | |
672 | /* Now ready to handle this BIO */ | |
d7428c50 DF |
673 | ret = dmz_queue_chunk_work(dmz, bio); |
674 | if (ret) { | |
49de3b7d | 675 | DMDEBUG("(%s): BIO op %d, can't process chunk %llu, err %i", |
2234e732 HR |
676 | dmz_metadata_label(zmd), |
677 | bio_op(bio), (u64)dmz_bio_chunk(zmd, bio), | |
678 | ret); | |
d7428c50 DF |
679 | return DM_MAPIO_REQUEUE; |
680 | } | |
3b1a94c8 DLM |
681 | |
682 | return DM_MAPIO_SUBMITTED; | |
683 | } | |
684 | ||
3b1a94c8 DLM |
685 | /* |
686 | * Get zoned device information. | |
687 | */ | |
bd5c4031 HR |
688 | static int dmz_get_zoned_device(struct dm_target *ti, char *path, |
689 | int idx, int nr_devs) | |
3b1a94c8 DLM |
690 | { |
691 | struct dmz_target *dmz = ti->private; | |
bd5c4031 | 692 | struct dm_dev *ddev; |
3b1a94c8 DLM |
693 | struct dmz_dev *dev; |
694 | int ret; | |
bd5c4031 | 695 | struct block_device *bdev; |
3b1a94c8 DLM |
696 | |
697 | /* Get the target device */ | |
bd5c4031 | 698 | ret = dm_get_device(ti, path, dm_table_get_mode(ti->table), &ddev); |
3b1a94c8 DLM |
699 | if (ret) { |
700 | ti->error = "Get target device failed"; | |
3b1a94c8 DLM |
701 | return ret; |
702 | } | |
703 | ||
bd5c4031 | 704 | bdev = ddev->bdev; |
7437bb73 | 705 | if (!bdev_is_zoned(bdev)) { |
bd5c4031 HR |
706 | if (nr_devs == 1) { |
707 | ti->error = "Invalid regular device"; | |
708 | goto err; | |
709 | } | |
710 | if (idx != 0) { | |
711 | ti->error = "First device must be a regular device"; | |
712 | goto err; | |
713 | } | |
714 | if (dmz->ddev[0]) { | |
715 | ti->error = "Too many regular devices"; | |
716 | goto err; | |
717 | } | |
718 | dev = &dmz->dev[idx]; | |
719 | dev->flags = DMZ_BDEV_REGULAR; | |
720 | } else { | |
721 | if (dmz->ddev[idx]) { | |
722 | ti->error = "Too many zoned devices"; | |
723 | goto err; | |
724 | } | |
725 | if (nr_devs > 1 && idx == 0) { | |
726 | ti->error = "First device must be a regular device"; | |
727 | goto err; | |
728 | } | |
729 | dev = &dmz->dev[idx]; | |
3b1a94c8 | 730 | } |
bd5c4031 | 731 | dev->bdev = bdev; |
69875d44 | 732 | dev->dev_idx = idx; |
3b1a94c8 | 733 | |
6dcbb52c | 734 | dev->capacity = bdev_nr_sectors(bdev); |
bd5c4031 HR |
735 | if (ti->begin) { |
736 | ti->error = "Partial mapping is not supported"; | |
3b1a94c8 DLM |
737 | goto err; |
738 | } | |
739 | ||
bd5c4031 | 740 | dmz->ddev[idx] = ddev; |
3b1a94c8 DLM |
741 | |
742 | return 0; | |
743 | err: | |
bd5c4031 HR |
744 | dm_put_device(ti, ddev); |
745 | return -EINVAL; | |
3b1a94c8 DLM |
746 | } |
747 | ||
748 | /* | |
749 | * Cleanup zoned device information. | |
750 | */ | |
9850ccd5 | 751 | static void dmz_put_zoned_devices(struct dm_target *ti) |
3b1a94c8 DLM |
752 | { |
753 | struct dmz_target *dmz = ti->private; | |
bd5c4031 | 754 | int i; |
3b1a94c8 | 755 | |
9850ccd5 FP |
756 | for (i = 0; i < dmz->nr_ddevs; i++) |
757 | if (dmz->ddev[i]) | |
bd5c4031 | 758 | dm_put_device(ti, dmz->ddev[i]); |
9850ccd5 FP |
759 | |
760 | kfree(dmz->ddev); | |
bd5c4031 HR |
761 | } |
762 | ||
763 | static int dmz_fixup_devices(struct dm_target *ti) | |
764 | { | |
765 | struct dmz_target *dmz = ti->private; | |
fabed68c | 766 | struct dmz_dev *reg_dev = NULL; |
4dba1288 HR |
767 | sector_t zone_nr_sectors = 0; |
768 | int i; | |
bd5c4031 HR |
769 | |
770 | /* | |
4dba1288 HR |
771 | * When we have more than on devices, the first one must be a |
772 | * regular block device and the others zoned block devices. | |
bd5c4031 | 773 | */ |
4dba1288 | 774 | if (dmz->nr_ddevs > 1) { |
bd5c4031 HR |
775 | reg_dev = &dmz->dev[0]; |
776 | if (!(reg_dev->flags & DMZ_BDEV_REGULAR)) { | |
777 | ti->error = "Primary disk is not a regular device"; | |
778 | return -EINVAL; | |
779 | } | |
4dba1288 | 780 | for (i = 1; i < dmz->nr_ddevs; i++) { |
fabed68c CH |
781 | struct dmz_dev *zoned_dev = &dmz->dev[i]; |
782 | struct block_device *bdev = zoned_dev->bdev; | |
783 | ||
4dba1288 HR |
784 | if (zoned_dev->flags & DMZ_BDEV_REGULAR) { |
785 | ti->error = "Secondary disk is not a zoned device"; | |
786 | return -EINVAL; | |
787 | } | |
4dba1288 | 788 | if (zone_nr_sectors && |
fabed68c | 789 | zone_nr_sectors != bdev_zone_sectors(bdev)) { |
4dba1288 HR |
790 | ti->error = "Zone nr sectors mismatch"; |
791 | return -EINVAL; | |
792 | } | |
fabed68c | 793 | zone_nr_sectors = bdev_zone_sectors(bdev); |
4dba1288 | 794 | zoned_dev->zone_nr_sectors = zone_nr_sectors; |
fabed68c | 795 | zoned_dev->nr_zones = bdev_nr_zones(bdev); |
bd5c4031 HR |
796 | } |
797 | } else { | |
fabed68c CH |
798 | struct dmz_dev *zoned_dev = &dmz->dev[0]; |
799 | struct block_device *bdev = zoned_dev->bdev; | |
800 | ||
bd5c4031 HR |
801 | if (zoned_dev->flags & DMZ_BDEV_REGULAR) { |
802 | ti->error = "Disk is not a zoned device"; | |
803 | return -EINVAL; | |
804 | } | |
fabed68c CH |
805 | zoned_dev->zone_nr_sectors = bdev_zone_sectors(bdev); |
806 | zoned_dev->nr_zones = bdev_nr_zones(bdev); | |
bd5c4031 | 807 | } |
bd5c4031 HR |
808 | |
809 | if (reg_dev) { | |
4dba1288 HR |
810 | sector_t zone_offset; |
811 | ||
812 | reg_dev->zone_nr_sectors = zone_nr_sectors; | |
42c689f6 NC |
813 | reg_dev->nr_zones = |
814 | DIV_ROUND_UP_SECTOR_T(reg_dev->capacity, | |
815 | reg_dev->zone_nr_sectors); | |
4dba1288 HR |
816 | reg_dev->zone_offset = 0; |
817 | zone_offset = reg_dev->nr_zones; | |
818 | for (i = 1; i < dmz->nr_ddevs; i++) { | |
819 | dmz->dev[i].zone_offset = zone_offset; | |
820 | zone_offset += dmz->dev[i].nr_zones; | |
821 | } | |
bd5c4031 HR |
822 | } |
823 | return 0; | |
3b1a94c8 DLM |
824 | } |
825 | ||
826 | /* | |
827 | * Setup target. | |
828 | */ | |
829 | static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
830 | { | |
831 | struct dmz_target *dmz; | |
f97809ae | 832 | int ret, i; |
3b1a94c8 DLM |
833 | |
834 | /* Check arguments */ | |
4dba1288 | 835 | if (argc < 1) { |
3b1a94c8 DLM |
836 | ti->error = "Invalid argument count"; |
837 | return -EINVAL; | |
838 | } | |
839 | ||
840 | /* Allocate and initialize the target descriptor */ | |
841 | dmz = kzalloc(sizeof(struct dmz_target), GFP_KERNEL); | |
842 | if (!dmz) { | |
843 | ti->error = "Unable to allocate the zoned target descriptor"; | |
844 | return -ENOMEM; | |
845 | } | |
4dba1288 | 846 | dmz->dev = kcalloc(argc, sizeof(struct dmz_dev), GFP_KERNEL); |
bd5c4031 HR |
847 | if (!dmz->dev) { |
848 | ti->error = "Unable to allocate the zoned device descriptors"; | |
849 | kfree(dmz); | |
850 | return -ENOMEM; | |
851 | } | |
4dba1288 HR |
852 | dmz->ddev = kcalloc(argc, sizeof(struct dm_dev *), GFP_KERNEL); |
853 | if (!dmz->ddev) { | |
854 | ti->error = "Unable to allocate the dm device descriptors"; | |
855 | ret = -ENOMEM; | |
856 | goto err; | |
857 | } | |
f97809ae | 858 | dmz->nr_ddevs = argc; |
4dba1288 | 859 | |
3b1a94c8 DLM |
860 | ti->private = dmz; |
861 | ||
862 | /* Get the target zoned block device */ | |
4dba1288 HR |
863 | for (i = 0; i < argc; i++) { |
864 | ret = dmz_get_zoned_device(ti, argv[i], i, argc); | |
865 | if (ret) | |
866 | goto err_dev; | |
bd5c4031 HR |
867 | } |
868 | ret = dmz_fixup_devices(ti); | |
4dba1288 HR |
869 | if (ret) |
870 | goto err_dev; | |
3b1a94c8 DLM |
871 | |
872 | /* Initialize metadata */ | |
bd5c4031 | 873 | ret = dmz_ctr_metadata(dmz->dev, argc, &dmz->metadata, |
2234e732 | 874 | dm_table_device_name(ti->table)); |
3b1a94c8 DLM |
875 | if (ret) { |
876 | ti->error = "Metadata initialization failed"; | |
877 | goto err_dev; | |
878 | } | |
879 | ||
880 | /* Set target (no write same support) */ | |
7b237748 | 881 | ti->max_io_len = dmz_zone_nr_sectors(dmz->metadata); |
3b1a94c8 DLM |
882 | ti->num_flush_bios = 1; |
883 | ti->num_discard_bios = 1; | |
884 | ti->num_write_zeroes_bios = 1; | |
885 | ti->per_io_data_size = sizeof(struct dmz_bioctx); | |
886 | ti->flush_supported = true; | |
887 | ti->discards_supported = true; | |
3b1a94c8 DLM |
888 | |
889 | /* The exposed capacity is the number of chunks that can be mapped */ | |
36820560 HR |
890 | ti->len = (sector_t)dmz_nr_chunks(dmz->metadata) << |
891 | dmz_zone_nr_sectors_shift(dmz->metadata); | |
3b1a94c8 DLM |
892 | |
893 | /* Zone BIO */ | |
6f1c819c KO |
894 | ret = bioset_init(&dmz->bio_set, DMZ_MIN_BIOS, 0, 0); |
895 | if (ret) { | |
3b1a94c8 | 896 | ti->error = "Create BIO set failed"; |
3b1a94c8 DLM |
897 | goto err_meta; |
898 | } | |
899 | ||
900 | /* Chunk BIO work */ | |
901 | mutex_init(&dmz->chunk_lock); | |
2d0b2d64 | 902 | INIT_RADIX_TREE(&dmz->chunk_rxtree, GFP_NOIO); |
2234e732 HR |
903 | dmz->chunk_wq = alloc_workqueue("dmz_cwq_%s", |
904 | WQ_MEM_RECLAIM | WQ_UNBOUND, 0, | |
905 | dmz_metadata_label(dmz->metadata)); | |
3b1a94c8 DLM |
906 | if (!dmz->chunk_wq) { |
907 | ti->error = "Create chunk workqueue failed"; | |
908 | ret = -ENOMEM; | |
909 | goto err_bio; | |
910 | } | |
911 | ||
912 | /* Flush work */ | |
913 | spin_lock_init(&dmz->flush_lock); | |
914 | bio_list_init(&dmz->flush_list); | |
915 | INIT_DELAYED_WORK(&dmz->flush_work, dmz_flush_work); | |
916 | dmz->flush_wq = alloc_ordered_workqueue("dmz_fwq_%s", WQ_MEM_RECLAIM, | |
2234e732 | 917 | dmz_metadata_label(dmz->metadata)); |
3b1a94c8 DLM |
918 | if (!dmz->flush_wq) { |
919 | ti->error = "Create flush workqueue failed"; | |
920 | ret = -ENOMEM; | |
921 | goto err_cwq; | |
922 | } | |
923 | mod_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD); | |
924 | ||
925 | /* Initialize reclaim */ | |
f97809ae HR |
926 | for (i = 0; i < dmz->nr_ddevs; i++) { |
927 | ret = dmz_ctr_reclaim(dmz->metadata, &dmz->dev[i].reclaim, i); | |
928 | if (ret) { | |
929 | ti->error = "Zone reclaim initialization failed"; | |
930 | goto err_fwq; | |
931 | } | |
3b1a94c8 DLM |
932 | } |
933 | ||
2234e732 HR |
934 | DMINFO("(%s): Target device: %llu 512-byte logical sectors (%llu blocks)", |
935 | dmz_metadata_label(dmz->metadata), | |
936 | (unsigned long long)ti->len, | |
937 | (unsigned long long)dmz_sect2blk(ti->len)); | |
3b1a94c8 DLM |
938 | |
939 | return 0; | |
940 | err_fwq: | |
941 | destroy_workqueue(dmz->flush_wq); | |
942 | err_cwq: | |
943 | destroy_workqueue(dmz->chunk_wq); | |
944 | err_bio: | |
d5ffebdd | 945 | mutex_destroy(&dmz->chunk_lock); |
6f1c819c | 946 | bioset_exit(&dmz->bio_set); |
3b1a94c8 DLM |
947 | err_meta: |
948 | dmz_dtr_metadata(dmz->metadata); | |
949 | err_dev: | |
9850ccd5 | 950 | dmz_put_zoned_devices(ti); |
3b1a94c8 | 951 | err: |
bd5c4031 | 952 | kfree(dmz->dev); |
3b1a94c8 DLM |
953 | kfree(dmz); |
954 | ||
955 | return ret; | |
956 | } | |
957 | ||
958 | /* | |
959 | * Cleanup target. | |
960 | */ | |
961 | static void dmz_dtr(struct dm_target *ti) | |
962 | { | |
963 | struct dmz_target *dmz = ti->private; | |
f97809ae | 964 | int i; |
3b1a94c8 | 965 | |
3b1a94c8 DLM |
966 | destroy_workqueue(dmz->chunk_wq); |
967 | ||
f97809ae HR |
968 | for (i = 0; i < dmz->nr_ddevs; i++) |
969 | dmz_dtr_reclaim(dmz->dev[i].reclaim); | |
3b1a94c8 DLM |
970 | |
971 | cancel_delayed_work_sync(&dmz->flush_work); | |
972 | destroy_workqueue(dmz->flush_wq); | |
973 | ||
974 | (void) dmz_flush_metadata(dmz->metadata); | |
975 | ||
976 | dmz_dtr_metadata(dmz->metadata); | |
977 | ||
6f1c819c | 978 | bioset_exit(&dmz->bio_set); |
3b1a94c8 | 979 | |
9850ccd5 | 980 | dmz_put_zoned_devices(ti); |
3b1a94c8 | 981 | |
d5ffebdd MS |
982 | mutex_destroy(&dmz->chunk_lock); |
983 | ||
bd5c4031 | 984 | kfree(dmz->dev); |
3b1a94c8 DLM |
985 | kfree(dmz); |
986 | } | |
987 | ||
988 | /* | |
989 | * Setup target request queue limits. | |
990 | */ | |
991 | static void dmz_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
992 | { | |
993 | struct dmz_target *dmz = ti->private; | |
36820560 | 994 | unsigned int chunk_sectors = dmz_zone_nr_sectors(dmz->metadata); |
3b1a94c8 DLM |
995 | |
996 | limits->logical_block_size = DMZ_BLOCK_SIZE; | |
997 | limits->physical_block_size = DMZ_BLOCK_SIZE; | |
998 | ||
999 | blk_limits_io_min(limits, DMZ_BLOCK_SIZE); | |
1000 | blk_limits_io_opt(limits, DMZ_BLOCK_SIZE); | |
1001 | ||
44d58370 | 1002 | limits->discard_alignment = 0; |
3b1a94c8 DLM |
1003 | limits->discard_granularity = DMZ_BLOCK_SIZE; |
1004 | limits->max_discard_sectors = chunk_sectors; | |
1005 | limits->max_hw_discard_sectors = chunk_sectors; | |
1006 | limits->max_write_zeroes_sectors = chunk_sectors; | |
1007 | ||
1008 | /* FS hint to try to align to the device zone size */ | |
1009 | limits->chunk_sectors = chunk_sectors; | |
1010 | limits->max_sectors = chunk_sectors; | |
1011 | ||
1012 | /* We are exposing a drive-managed zoned block device */ | |
7437bb73 | 1013 | limits->zoned = false; |
3b1a94c8 DLM |
1014 | } |
1015 | ||
1016 | /* | |
1017 | * Pass on ioctl to the backend device. | |
1018 | */ | |
5bd5e8d8 | 1019 | static int dmz_prepare_ioctl(struct dm_target *ti, struct block_device **bdev) |
3b1a94c8 DLM |
1020 | { |
1021 | struct dmz_target *dmz = ti->private; | |
52d67758 | 1022 | struct dmz_dev *dev = &dmz->dev[0]; |
3b1a94c8 | 1023 | |
52d67758 | 1024 | if (!dmz_check_bdev(dev)) |
e7fad909 | 1025 | return -EIO; |
75d66ffb | 1026 | |
52d67758 | 1027 | *bdev = dev->bdev; |
3b1a94c8 DLM |
1028 | |
1029 | return 0; | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * Stop works on suspend. | |
1034 | */ | |
1035 | static void dmz_suspend(struct dm_target *ti) | |
1036 | { | |
1037 | struct dmz_target *dmz = ti->private; | |
f97809ae | 1038 | int i; |
3b1a94c8 DLM |
1039 | |
1040 | flush_workqueue(dmz->chunk_wq); | |
f97809ae HR |
1041 | for (i = 0; i < dmz->nr_ddevs; i++) |
1042 | dmz_suspend_reclaim(dmz->dev[i].reclaim); | |
3b1a94c8 DLM |
1043 | cancel_delayed_work_sync(&dmz->flush_work); |
1044 | } | |
1045 | ||
1046 | /* | |
1047 | * Restart works on resume or if suspend failed. | |
1048 | */ | |
1049 | static void dmz_resume(struct dm_target *ti) | |
1050 | { | |
1051 | struct dmz_target *dmz = ti->private; | |
f97809ae | 1052 | int i; |
3b1a94c8 DLM |
1053 | |
1054 | queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD); | |
f97809ae HR |
1055 | for (i = 0; i < dmz->nr_ddevs; i++) |
1056 | dmz_resume_reclaim(dmz->dev[i].reclaim); | |
3b1a94c8 DLM |
1057 | } |
1058 | ||
1059 | static int dmz_iterate_devices(struct dm_target *ti, | |
1060 | iterate_devices_callout_fn fn, void *data) | |
1061 | { | |
1062 | struct dmz_target *dmz = ti->private; | |
bd5c4031 HR |
1063 | unsigned int zone_nr_sectors = dmz_zone_nr_sectors(dmz->metadata); |
1064 | sector_t capacity; | |
4dba1288 | 1065 | int i, r; |
bd5c4031 | 1066 | |
4dba1288 HR |
1067 | for (i = 0; i < dmz->nr_ddevs; i++) { |
1068 | capacity = dmz->dev[i].capacity & ~(zone_nr_sectors - 1); | |
1069 | r = fn(ti, dmz->ddev[i], 0, capacity, data); | |
1070 | if (r) | |
1071 | break; | |
bd5c4031 HR |
1072 | } |
1073 | return r; | |
3b1a94c8 DLM |
1074 | } |
1075 | ||
bc3d5717 HR |
1076 | static void dmz_status(struct dm_target *ti, status_type_t type, |
1077 | unsigned int status_flags, char *result, | |
1078 | unsigned int maxlen) | |
1079 | { | |
1080 | struct dmz_target *dmz = ti->private; | |
1081 | ssize_t sz = 0; | |
1082 | char buf[BDEVNAME_SIZE]; | |
bd5c4031 | 1083 | struct dmz_dev *dev; |
bd82fdab | 1084 | int i; |
bc3d5717 HR |
1085 | |
1086 | switch (type) { | |
1087 | case STATUSTYPE_INFO: | |
bd82fdab | 1088 | DMEMIT("%u zones %u/%u cache", |
bc3d5717 | 1089 | dmz_nr_zones(dmz->metadata), |
34f5affd | 1090 | dmz_nr_unmap_cache_zones(dmz->metadata), |
bd82fdab | 1091 | dmz_nr_cache_zones(dmz->metadata)); |
4dba1288 | 1092 | for (i = 0; i < dmz->nr_ddevs; i++) { |
bd82fdab HR |
1093 | /* |
1094 | * For a multi-device setup the first device | |
1095 | * contains only cache zones. | |
1096 | */ | |
1097 | if ((i == 0) && | |
1098 | (dmz_nr_cache_zones(dmz->metadata) > 0)) | |
1099 | continue; | |
1100 | DMEMIT(" %u/%u random %u/%u sequential", | |
1101 | dmz_nr_unmap_rnd_zones(dmz->metadata, i), | |
1102 | dmz_nr_rnd_zones(dmz->metadata, i), | |
1103 | dmz_nr_unmap_seq_zones(dmz->metadata, i), | |
1104 | dmz_nr_seq_zones(dmz->metadata, i)); | |
1105 | } | |
bc3d5717 HR |
1106 | break; |
1107 | case STATUSTYPE_TABLE: | |
bd5c4031 HR |
1108 | dev = &dmz->dev[0]; |
1109 | format_dev_t(buf, dev->bdev->bd_dev); | |
bc3d5717 | 1110 | DMEMIT("%s", buf); |
4dba1288 HR |
1111 | for (i = 1; i < dmz->nr_ddevs; i++) { |
1112 | dev = &dmz->dev[i]; | |
bd5c4031 HR |
1113 | format_dev_t(buf, dev->bdev->bd_dev); |
1114 | DMEMIT(" %s", buf); | |
1115 | } | |
bc3d5717 | 1116 | break; |
8ec45662 TS |
1117 | case STATUSTYPE_IMA: |
1118 | *result = '\0'; | |
1119 | break; | |
bc3d5717 | 1120 | } |
bc3d5717 HR |
1121 | } |
1122 | ||
90b39d58 HR |
1123 | static int dmz_message(struct dm_target *ti, unsigned int argc, char **argv, |
1124 | char *result, unsigned int maxlen) | |
1125 | { | |
1126 | struct dmz_target *dmz = ti->private; | |
1127 | int r = -EINVAL; | |
1128 | ||
1129 | if (!strcasecmp(argv[0], "reclaim")) { | |
f97809ae HR |
1130 | int i; |
1131 | ||
1132 | for (i = 0; i < dmz->nr_ddevs; i++) | |
1133 | dmz_schedule_reclaim(dmz->dev[i].reclaim); | |
90b39d58 HR |
1134 | r = 0; |
1135 | } else | |
1136 | DMERR("unrecognized message %s", argv[0]); | |
1137 | return r; | |
1138 | } | |
1139 | ||
3664ff82 | 1140 | static struct target_type zoned_target = { |
3b1a94c8 | 1141 | .name = "zoned", |
bd5c4031 | 1142 | .version = {2, 0, 0}, |
2d669ceb | 1143 | .features = DM_TARGET_SINGLETON | DM_TARGET_MIXED_ZONED_MODEL, |
3b1a94c8 DLM |
1144 | .module = THIS_MODULE, |
1145 | .ctr = dmz_ctr, | |
1146 | .dtr = dmz_dtr, | |
1147 | .map = dmz_map, | |
3b1a94c8 DLM |
1148 | .io_hints = dmz_io_hints, |
1149 | .prepare_ioctl = dmz_prepare_ioctl, | |
1150 | .postsuspend = dmz_suspend, | |
1151 | .resume = dmz_resume, | |
1152 | .iterate_devices = dmz_iterate_devices, | |
bc3d5717 | 1153 | .status = dmz_status, |
90b39d58 | 1154 | .message = dmz_message, |
3b1a94c8 | 1155 | }; |
3664ff82 | 1156 | module_dm(zoned); |
3b1a94c8 DLM |
1157 | |
1158 | MODULE_DESCRIPTION(DM_NAME " target for zoned block devices"); | |
1159 | MODULE_AUTHOR("Damien Le Moal <damien.lemoal@wdc.com>"); | |
1160 | MODULE_LICENSE("GPL"); |