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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 | ||
6f1c819c | 128 | clone = bio_clone_fast(bio, GFP_NOIO, &dmz->bio_set); |
3b1a94c8 DLM |
129 | if (!clone) |
130 | return -ENOMEM; | |
131 | ||
52d67758 HR |
132 | bio_set_dev(clone, dev->bdev); |
133 | bioctx->dev = dev; | |
d57f9da8 DLM |
134 | clone->bi_iter.bi_sector = |
135 | dmz_start_sect(dmz->metadata, zone) + dmz_blk2sect(chunk_block); | |
3b1a94c8 | 136 | clone->bi_iter.bi_size = dmz_blk2sect(nr_blocks) << SECTOR_SHIFT; |
d57f9da8 | 137 | clone->bi_end_io = dmz_clone_endio; |
3b1a94c8 DLM |
138 | clone->bi_private = bioctx; |
139 | ||
140 | bio_advance(bio, clone->bi_iter.bi_size); | |
141 | ||
092b5648 | 142 | refcount_inc(&bioctx->ref); |
ed00aabd | 143 | submit_bio_noacct(clone); |
3b1a94c8 | 144 | |
d57f9da8 DLM |
145 | if (bio_op(bio) == REQ_OP_WRITE && dmz_is_seq(zone)) |
146 | zone->wp_block += nr_blocks; | |
147 | ||
3b1a94c8 DLM |
148 | return 0; |
149 | } | |
150 | ||
151 | /* | |
152 | * Zero out pages of discarded blocks accessed by a read BIO. | |
153 | */ | |
154 | static void dmz_handle_read_zero(struct dmz_target *dmz, struct bio *bio, | |
155 | sector_t chunk_block, unsigned int nr_blocks) | |
156 | { | |
157 | unsigned int size = nr_blocks << DMZ_BLOCK_SHIFT; | |
158 | ||
159 | /* Clear nr_blocks */ | |
160 | swap(bio->bi_iter.bi_size, size); | |
161 | zero_fill_bio(bio); | |
162 | swap(bio->bi_iter.bi_size, size); | |
163 | ||
164 | bio_advance(bio, size); | |
165 | } | |
166 | ||
167 | /* | |
168 | * Process a read BIO. | |
169 | */ | |
170 | static int dmz_handle_read(struct dmz_target *dmz, struct dm_zone *zone, | |
171 | struct bio *bio) | |
172 | { | |
36820560 HR |
173 | struct dmz_metadata *zmd = dmz->metadata; |
174 | sector_t chunk_block = dmz_chunk_block(zmd, dmz_bio_block(bio)); | |
3b1a94c8 DLM |
175 | unsigned int nr_blocks = dmz_bio_blocks(bio); |
176 | sector_t end_block = chunk_block + nr_blocks; | |
177 | struct dm_zone *rzone, *bzone; | |
178 | int ret; | |
179 | ||
180 | /* Read into unmapped chunks need only zeroing the BIO buffer */ | |
181 | if (!zone) { | |
182 | zero_fill_bio(bio); | |
183 | return 0; | |
184 | } | |
185 | ||
2234e732 HR |
186 | DMDEBUG("(%s): READ chunk %llu -> %s zone %u, block %llu, %u blocks", |
187 | dmz_metadata_label(zmd), | |
188 | (unsigned long long)dmz_bio_chunk(zmd, bio), | |
34f5affd HR |
189 | (dmz_is_rnd(zone) ? "RND" : |
190 | (dmz_is_cache(zone) ? "CACHE" : "SEQ")), | |
2234e732 HR |
191 | zone->id, |
192 | (unsigned long long)chunk_block, nr_blocks); | |
3b1a94c8 DLM |
193 | |
194 | /* Check block validity to determine the read location */ | |
195 | bzone = zone->bzone; | |
196 | while (chunk_block < end_block) { | |
197 | nr_blocks = 0; | |
34f5affd HR |
198 | if (dmz_is_rnd(zone) || dmz_is_cache(zone) || |
199 | chunk_block < zone->wp_block) { | |
3b1a94c8 | 200 | /* Test block validity in the data zone */ |
36820560 | 201 | ret = dmz_block_valid(zmd, zone, chunk_block); |
3b1a94c8 DLM |
202 | if (ret < 0) |
203 | return ret; | |
204 | if (ret > 0) { | |
205 | /* Read data zone blocks */ | |
206 | nr_blocks = ret; | |
207 | rzone = zone; | |
208 | } | |
209 | } | |
210 | ||
211 | /* | |
212 | * No valid blocks found in the data zone. | |
213 | * Check the buffer zone, if there is one. | |
214 | */ | |
215 | if (!nr_blocks && bzone) { | |
36820560 | 216 | ret = dmz_block_valid(zmd, bzone, chunk_block); |
3b1a94c8 DLM |
217 | if (ret < 0) |
218 | return ret; | |
219 | if (ret > 0) { | |
220 | /* Read buffer zone blocks */ | |
221 | nr_blocks = ret; | |
222 | rzone = bzone; | |
223 | } | |
224 | } | |
225 | ||
226 | if (nr_blocks) { | |
227 | /* Valid blocks found: read them */ | |
52d67758 HR |
228 | nr_blocks = min_t(unsigned int, nr_blocks, |
229 | end_block - chunk_block); | |
230 | ret = dmz_submit_bio(dmz, rzone, bio, | |
231 | chunk_block, nr_blocks); | |
3b1a94c8 DLM |
232 | if (ret) |
233 | return ret; | |
234 | chunk_block += nr_blocks; | |
235 | } else { | |
236 | /* No valid block: zeroout the current BIO block */ | |
237 | dmz_handle_read_zero(dmz, bio, chunk_block, 1); | |
238 | chunk_block++; | |
239 | } | |
240 | } | |
241 | ||
242 | return 0; | |
243 | } | |
244 | ||
3b1a94c8 DLM |
245 | /* |
246 | * Write blocks directly in a data zone, at the write pointer. | |
247 | * If a buffer zone is assigned, invalidate the blocks written | |
248 | * in place. | |
249 | */ | |
250 | static int dmz_handle_direct_write(struct dmz_target *dmz, | |
251 | struct dm_zone *zone, struct bio *bio, | |
252 | sector_t chunk_block, | |
253 | unsigned int nr_blocks) | |
254 | { | |
255 | struct dmz_metadata *zmd = dmz->metadata; | |
256 | struct dm_zone *bzone = zone->bzone; | |
257 | int ret; | |
258 | ||
259 | if (dmz_is_readonly(zone)) | |
260 | return -EROFS; | |
261 | ||
262 | /* Submit write */ | |
d57f9da8 DLM |
263 | ret = dmz_submit_bio(dmz, zone, bio, chunk_block, nr_blocks); |
264 | if (ret) | |
265 | return ret; | |
3b1a94c8 DLM |
266 | |
267 | /* | |
268 | * Validate the blocks in the data zone and invalidate | |
269 | * in the buffer zone, if there is one. | |
270 | */ | |
271 | ret = dmz_validate_blocks(zmd, zone, chunk_block, nr_blocks); | |
272 | if (ret == 0 && bzone) | |
273 | ret = dmz_invalidate_blocks(zmd, bzone, chunk_block, nr_blocks); | |
274 | ||
275 | return ret; | |
276 | } | |
277 | ||
278 | /* | |
279 | * Write blocks in the buffer zone of @zone. | |
280 | * If no buffer zone is assigned yet, get one. | |
281 | * Called with @zone write locked. | |
282 | */ | |
283 | static int dmz_handle_buffered_write(struct dmz_target *dmz, | |
284 | struct dm_zone *zone, struct bio *bio, | |
285 | sector_t chunk_block, | |
286 | unsigned int nr_blocks) | |
287 | { | |
288 | struct dmz_metadata *zmd = dmz->metadata; | |
289 | struct dm_zone *bzone; | |
290 | int ret; | |
291 | ||
292 | /* Get the buffer zone. One will be allocated if needed */ | |
293 | bzone = dmz_get_chunk_buffer(zmd, zone); | |
75d66ffb DF |
294 | if (IS_ERR(bzone)) |
295 | return PTR_ERR(bzone); | |
3b1a94c8 DLM |
296 | |
297 | if (dmz_is_readonly(bzone)) | |
298 | return -EROFS; | |
299 | ||
300 | /* Submit write */ | |
d57f9da8 DLM |
301 | ret = dmz_submit_bio(dmz, bzone, bio, chunk_block, nr_blocks); |
302 | if (ret) | |
303 | return ret; | |
3b1a94c8 DLM |
304 | |
305 | /* | |
306 | * Validate the blocks in the buffer zone | |
307 | * and invalidate in the data zone. | |
308 | */ | |
309 | ret = dmz_validate_blocks(zmd, bzone, chunk_block, nr_blocks); | |
310 | if (ret == 0 && chunk_block < zone->wp_block) | |
311 | ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks); | |
312 | ||
313 | return ret; | |
314 | } | |
315 | ||
316 | /* | |
317 | * Process a write BIO. | |
318 | */ | |
319 | static int dmz_handle_write(struct dmz_target *dmz, struct dm_zone *zone, | |
320 | struct bio *bio) | |
321 | { | |
36820560 HR |
322 | struct dmz_metadata *zmd = dmz->metadata; |
323 | sector_t chunk_block = dmz_chunk_block(zmd, dmz_bio_block(bio)); | |
3b1a94c8 DLM |
324 | unsigned int nr_blocks = dmz_bio_blocks(bio); |
325 | ||
326 | if (!zone) | |
327 | return -ENOSPC; | |
328 | ||
2234e732 HR |
329 | DMDEBUG("(%s): WRITE chunk %llu -> %s zone %u, block %llu, %u blocks", |
330 | dmz_metadata_label(zmd), | |
331 | (unsigned long long)dmz_bio_chunk(zmd, bio), | |
34f5affd HR |
332 | (dmz_is_rnd(zone) ? "RND" : |
333 | (dmz_is_cache(zone) ? "CACHE" : "SEQ")), | |
2234e732 HR |
334 | zone->id, |
335 | (unsigned long long)chunk_block, nr_blocks); | |
3b1a94c8 | 336 | |
34f5affd HR |
337 | if (dmz_is_rnd(zone) || dmz_is_cache(zone) || |
338 | chunk_block == zone->wp_block) { | |
3b1a94c8 DLM |
339 | /* |
340 | * zone is a random zone or it is a sequential zone | |
341 | * and the BIO is aligned to the zone write pointer: | |
342 | * direct write the zone. | |
343 | */ | |
52d67758 HR |
344 | return dmz_handle_direct_write(dmz, zone, bio, |
345 | chunk_block, nr_blocks); | |
3b1a94c8 DLM |
346 | } |
347 | ||
348 | /* | |
349 | * This is an unaligned write in a sequential zone: | |
350 | * use buffered write. | |
351 | */ | |
352 | return dmz_handle_buffered_write(dmz, zone, bio, chunk_block, nr_blocks); | |
353 | } | |
354 | ||
355 | /* | |
356 | * Process a discard BIO. | |
357 | */ | |
358 | static int dmz_handle_discard(struct dmz_target *dmz, struct dm_zone *zone, | |
359 | struct bio *bio) | |
360 | { | |
361 | struct dmz_metadata *zmd = dmz->metadata; | |
362 | sector_t block = dmz_bio_block(bio); | |
363 | unsigned int nr_blocks = dmz_bio_blocks(bio); | |
36820560 | 364 | sector_t chunk_block = dmz_chunk_block(zmd, block); |
3b1a94c8 DLM |
365 | int ret = 0; |
366 | ||
367 | /* For unmapped chunks, there is nothing to do */ | |
368 | if (!zone) | |
369 | return 0; | |
370 | ||
371 | if (dmz_is_readonly(zone)) | |
372 | return -EROFS; | |
373 | ||
2234e732 HR |
374 | DMDEBUG("(%s): DISCARD chunk %llu -> zone %u, block %llu, %u blocks", |
375 | dmz_metadata_label(dmz->metadata), | |
376 | (unsigned long long)dmz_bio_chunk(zmd, bio), | |
377 | zone->id, | |
378 | (unsigned long long)chunk_block, nr_blocks); | |
3b1a94c8 DLM |
379 | |
380 | /* | |
381 | * Invalidate blocks in the data zone and its | |
382 | * buffer zone if one is mapped. | |
383 | */ | |
34f5affd HR |
384 | if (dmz_is_rnd(zone) || dmz_is_cache(zone) || |
385 | chunk_block < zone->wp_block) | |
3b1a94c8 DLM |
386 | ret = dmz_invalidate_blocks(zmd, zone, chunk_block, nr_blocks); |
387 | if (ret == 0 && zone->bzone) | |
388 | ret = dmz_invalidate_blocks(zmd, zone->bzone, | |
389 | chunk_block, nr_blocks); | |
390 | return ret; | |
391 | } | |
392 | ||
393 | /* | |
394 | * Process a BIO. | |
395 | */ | |
396 | static void dmz_handle_bio(struct dmz_target *dmz, struct dm_chunk_work *cw, | |
397 | struct bio *bio) | |
398 | { | |
52d67758 HR |
399 | struct dmz_bioctx *bioctx = |
400 | dm_per_bio_data(bio, sizeof(struct dmz_bioctx)); | |
3b1a94c8 DLM |
401 | struct dmz_metadata *zmd = dmz->metadata; |
402 | struct dm_zone *zone; | |
174364f6 | 403 | int ret; |
3b1a94c8 DLM |
404 | |
405 | dmz_lock_metadata(zmd); | |
406 | ||
407 | /* | |
408 | * Get the data zone mapping the chunk. There may be no | |
409 | * mapping for read and discard. If a mapping is obtained, | |
410 | + the zone returned will be set to active state. | |
411 | */ | |
36820560 | 412 | zone = dmz_get_chunk_mapping(zmd, dmz_bio_chunk(zmd, bio), |
3b1a94c8 DLM |
413 | bio_op(bio)); |
414 | if (IS_ERR(zone)) { | |
415 | ret = PTR_ERR(zone); | |
416 | goto out; | |
417 | } | |
418 | ||
419 | /* Process the BIO */ | |
420 | if (zone) { | |
421 | dmz_activate_zone(zone); | |
422 | bioctx->zone = zone; | |
f97809ae | 423 | dmz_reclaim_bio_acc(zone->dev->reclaim); |
3b1a94c8 DLM |
424 | } |
425 | ||
426 | switch (bio_op(bio)) { | |
427 | case REQ_OP_READ: | |
428 | ret = dmz_handle_read(dmz, zone, bio); | |
429 | break; | |
430 | case REQ_OP_WRITE: | |
431 | ret = dmz_handle_write(dmz, zone, bio); | |
432 | break; | |
433 | case REQ_OP_DISCARD: | |
434 | case REQ_OP_WRITE_ZEROES: | |
435 | ret = dmz_handle_discard(dmz, zone, bio); | |
436 | break; | |
437 | default: | |
2234e732 HR |
438 | DMERR("(%s): Unsupported BIO operation 0x%x", |
439 | dmz_metadata_label(dmz->metadata), bio_op(bio)); | |
3b1a94c8 DLM |
440 | ret = -EIO; |
441 | } | |
442 | ||
443 | /* | |
444 | * Release the chunk mapping. This will check that the mapping | |
445 | * is still valid, that is, that the zone used still has valid blocks. | |
446 | */ | |
447 | if (zone) | |
448 | dmz_put_chunk_mapping(zmd, zone); | |
449 | out: | |
450 | dmz_bio_endio(bio, errno_to_blk_status(ret)); | |
451 | ||
452 | dmz_unlock_metadata(zmd); | |
453 | } | |
454 | ||
455 | /* | |
456 | * Increment a chunk reference counter. | |
457 | */ | |
458 | static inline void dmz_get_chunk_work(struct dm_chunk_work *cw) | |
459 | { | |
092b5648 | 460 | refcount_inc(&cw->refcount); |
3b1a94c8 DLM |
461 | } |
462 | ||
463 | /* | |
464 | * Decrement a chunk work reference count and | |
465 | * free it if it becomes 0. | |
466 | */ | |
467 | static void dmz_put_chunk_work(struct dm_chunk_work *cw) | |
468 | { | |
092b5648 | 469 | if (refcount_dec_and_test(&cw->refcount)) { |
3b1a94c8 DLM |
470 | WARN_ON(!bio_list_empty(&cw->bio_list)); |
471 | radix_tree_delete(&cw->target->chunk_rxtree, cw->chunk); | |
472 | kfree(cw); | |
473 | } | |
474 | } | |
475 | ||
476 | /* | |
477 | * Chunk BIO work function. | |
478 | */ | |
479 | static void dmz_chunk_work(struct work_struct *work) | |
480 | { | |
481 | struct dm_chunk_work *cw = container_of(work, struct dm_chunk_work, work); | |
482 | struct dmz_target *dmz = cw->target; | |
483 | struct bio *bio; | |
484 | ||
485 | mutex_lock(&dmz->chunk_lock); | |
486 | ||
487 | /* Process the chunk BIOs */ | |
488 | while ((bio = bio_list_pop(&cw->bio_list))) { | |
489 | mutex_unlock(&dmz->chunk_lock); | |
490 | dmz_handle_bio(dmz, cw, bio); | |
491 | mutex_lock(&dmz->chunk_lock); | |
492 | dmz_put_chunk_work(cw); | |
493 | } | |
494 | ||
495 | /* Queueing the work incremented the work refcount */ | |
496 | dmz_put_chunk_work(cw); | |
497 | ||
498 | mutex_unlock(&dmz->chunk_lock); | |
499 | } | |
500 | ||
501 | /* | |
502 | * Flush work. | |
503 | */ | |
504 | static void dmz_flush_work(struct work_struct *work) | |
505 | { | |
506 | struct dmz_target *dmz = container_of(work, struct dmz_target, flush_work.work); | |
507 | struct bio *bio; | |
508 | int ret; | |
509 | ||
510 | /* Flush dirty metadata blocks */ | |
511 | ret = dmz_flush_metadata(dmz->metadata); | |
75d66ffb | 512 | if (ret) |
49de3b7d | 513 | DMDEBUG("(%s): Metadata flush failed, rc=%d", |
2234e732 | 514 | dmz_metadata_label(dmz->metadata), ret); |
3b1a94c8 DLM |
515 | |
516 | /* Process queued flush requests */ | |
517 | while (1) { | |
518 | spin_lock(&dmz->flush_lock); | |
519 | bio = bio_list_pop(&dmz->flush_list); | |
520 | spin_unlock(&dmz->flush_lock); | |
521 | ||
522 | if (!bio) | |
523 | break; | |
524 | ||
525 | dmz_bio_endio(bio, errno_to_blk_status(ret)); | |
526 | } | |
527 | ||
528 | queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD); | |
529 | } | |
530 | ||
531 | /* | |
532 | * Get a chunk work and start it to process a new BIO. | |
533 | * If the BIO chunk has no work yet, create one. | |
534 | */ | |
d7428c50 | 535 | static int dmz_queue_chunk_work(struct dmz_target *dmz, struct bio *bio) |
3b1a94c8 | 536 | { |
36820560 | 537 | unsigned int chunk = dmz_bio_chunk(dmz->metadata, bio); |
3b1a94c8 | 538 | struct dm_chunk_work *cw; |
d7428c50 | 539 | int ret = 0; |
3b1a94c8 DLM |
540 | |
541 | mutex_lock(&dmz->chunk_lock); | |
542 | ||
543 | /* Get the BIO chunk work. If one is not active yet, create one */ | |
544 | cw = radix_tree_lookup(&dmz->chunk_rxtree, chunk); | |
ee63634b SK |
545 | if (cw) { |
546 | dmz_get_chunk_work(cw); | |
547 | } else { | |
3b1a94c8 | 548 | /* Create a new chunk work */ |
4218a955 | 549 | cw = kmalloc(sizeof(struct dm_chunk_work), GFP_NOIO); |
d7428c50 DF |
550 | if (unlikely(!cw)) { |
551 | ret = -ENOMEM; | |
3b1a94c8 | 552 | goto out; |
d7428c50 | 553 | } |
3b1a94c8 DLM |
554 | |
555 | INIT_WORK(&cw->work, dmz_chunk_work); | |
ee63634b | 556 | refcount_set(&cw->refcount, 1); |
3b1a94c8 DLM |
557 | cw->target = dmz; |
558 | cw->chunk = chunk; | |
559 | bio_list_init(&cw->bio_list); | |
560 | ||
561 | ret = radix_tree_insert(&dmz->chunk_rxtree, chunk, cw); | |
562 | if (unlikely(ret)) { | |
563 | kfree(cw); | |
3b1a94c8 DLM |
564 | goto out; |
565 | } | |
566 | } | |
567 | ||
568 | bio_list_add(&cw->bio_list, bio); | |
3b1a94c8 DLM |
569 | |
570 | if (queue_work(dmz->chunk_wq, &cw->work)) | |
571 | dmz_get_chunk_work(cw); | |
572 | out: | |
573 | mutex_unlock(&dmz->chunk_lock); | |
d7428c50 | 574 | return ret; |
3b1a94c8 DLM |
575 | } |
576 | ||
75d66ffb | 577 | /* |
e7fad909 | 578 | * Check if the backing device is being removed. If it's on the way out, |
75d66ffb DF |
579 | * start failing I/O. Reclaim and metadata components also call this |
580 | * function to cleanly abort operation in the event of such failure. | |
581 | */ | |
582 | bool dmz_bdev_is_dying(struct dmz_dev *dmz_dev) | |
583 | { | |
e7fad909 DF |
584 | if (dmz_dev->flags & DMZ_BDEV_DYING) |
585 | return true; | |
75d66ffb | 586 | |
e7fad909 DF |
587 | if (dmz_dev->flags & DMZ_CHECK_BDEV) |
588 | return !dmz_check_bdev(dmz_dev); | |
589 | ||
590 | if (blk_queue_dying(bdev_get_queue(dmz_dev->bdev))) { | |
591 | dmz_dev_warn(dmz_dev, "Backing device queue dying"); | |
592 | dmz_dev->flags |= DMZ_BDEV_DYING; | |
75d66ffb DF |
593 | } |
594 | ||
595 | return dmz_dev->flags & DMZ_BDEV_DYING; | |
596 | } | |
597 | ||
e7fad909 DF |
598 | /* |
599 | * Check the backing device availability. This detects such events as | |
600 | * backing device going offline due to errors, media removals, etc. | |
601 | * This check is less efficient than dmz_bdev_is_dying() and should | |
602 | * only be performed as a part of error handling. | |
603 | */ | |
604 | bool dmz_check_bdev(struct dmz_dev *dmz_dev) | |
605 | { | |
606 | struct gendisk *disk; | |
607 | ||
608 | dmz_dev->flags &= ~DMZ_CHECK_BDEV; | |
609 | ||
610 | if (dmz_bdev_is_dying(dmz_dev)) | |
611 | return false; | |
612 | ||
613 | disk = dmz_dev->bdev->bd_disk; | |
614 | if (disk->fops->check_events && | |
615 | disk->fops->check_events(disk, 0) & DISK_EVENT_MEDIA_CHANGE) { | |
616 | dmz_dev_warn(dmz_dev, "Backing device offline"); | |
617 | dmz_dev->flags |= DMZ_BDEV_DYING; | |
618 | } | |
619 | ||
620 | return !(dmz_dev->flags & DMZ_BDEV_DYING); | |
621 | } | |
622 | ||
3b1a94c8 DLM |
623 | /* |
624 | * Process a new BIO. | |
625 | */ | |
626 | static int dmz_map(struct dm_target *ti, struct bio *bio) | |
627 | { | |
628 | struct dmz_target *dmz = ti->private; | |
36820560 | 629 | struct dmz_metadata *zmd = dmz->metadata; |
3b1a94c8 DLM |
630 | struct dmz_bioctx *bioctx = dm_per_bio_data(bio, sizeof(struct dmz_bioctx)); |
631 | sector_t sector = bio->bi_iter.bi_sector; | |
632 | unsigned int nr_sectors = bio_sectors(bio); | |
633 | sector_t chunk_sector; | |
d7428c50 | 634 | int ret; |
3b1a94c8 | 635 | |
d0e21ce4 | 636 | if (dmz_dev_is_dying(zmd)) |
75d66ffb DF |
637 | return DM_MAPIO_KILL; |
638 | ||
2234e732 HR |
639 | DMDEBUG("(%s): BIO op %d sector %llu + %u => chunk %llu, block %llu, %u blocks", |
640 | dmz_metadata_label(zmd), | |
641 | bio_op(bio), (unsigned long long)sector, nr_sectors, | |
642 | (unsigned long long)dmz_bio_chunk(zmd, bio), | |
643 | (unsigned long long)dmz_chunk_block(zmd, dmz_bio_block(bio)), | |
644 | (unsigned int)dmz_bio_blocks(bio)); | |
3b1a94c8 | 645 | |
edbe9597 | 646 | if (!nr_sectors && bio_op(bio) != REQ_OP_WRITE) |
3b1a94c8 DLM |
647 | return DM_MAPIO_REMAPPED; |
648 | ||
649 | /* The BIO should be block aligned */ | |
650 | if ((nr_sectors & DMZ_BLOCK_SECTORS_MASK) || (sector & DMZ_BLOCK_SECTORS_MASK)) | |
651 | return DM_MAPIO_KILL; | |
652 | ||
653 | /* Initialize the BIO context */ | |
52d67758 | 654 | bioctx->dev = NULL; |
3b1a94c8 DLM |
655 | bioctx->zone = NULL; |
656 | bioctx->bio = bio; | |
092b5648 | 657 | refcount_set(&bioctx->ref, 1); |
3b1a94c8 DLM |
658 | |
659 | /* Set the BIO pending in the flush list */ | |
edbe9597 | 660 | if (!nr_sectors && bio_op(bio) == REQ_OP_WRITE) { |
3b1a94c8 DLM |
661 | spin_lock(&dmz->flush_lock); |
662 | bio_list_add(&dmz->flush_list, bio); | |
663 | spin_unlock(&dmz->flush_lock); | |
664 | mod_delayed_work(dmz->flush_wq, &dmz->flush_work, 0); | |
665 | return DM_MAPIO_SUBMITTED; | |
666 | } | |
667 | ||
668 | /* Split zone BIOs to fit entirely into a zone */ | |
36820560 HR |
669 | chunk_sector = sector & (dmz_zone_nr_sectors(zmd) - 1); |
670 | if (chunk_sector + nr_sectors > dmz_zone_nr_sectors(zmd)) | |
671 | dm_accept_partial_bio(bio, dmz_zone_nr_sectors(zmd) - chunk_sector); | |
3b1a94c8 DLM |
672 | |
673 | /* Now ready to handle this BIO */ | |
d7428c50 DF |
674 | ret = dmz_queue_chunk_work(dmz, bio); |
675 | if (ret) { | |
49de3b7d | 676 | DMDEBUG("(%s): BIO op %d, can't process chunk %llu, err %i", |
2234e732 HR |
677 | dmz_metadata_label(zmd), |
678 | bio_op(bio), (u64)dmz_bio_chunk(zmd, bio), | |
679 | ret); | |
d7428c50 DF |
680 | return DM_MAPIO_REQUEUE; |
681 | } | |
3b1a94c8 DLM |
682 | |
683 | return DM_MAPIO_SUBMITTED; | |
684 | } | |
685 | ||
3b1a94c8 DLM |
686 | /* |
687 | * Get zoned device information. | |
688 | */ | |
bd5c4031 HR |
689 | static int dmz_get_zoned_device(struct dm_target *ti, char *path, |
690 | int idx, int nr_devs) | |
3b1a94c8 DLM |
691 | { |
692 | struct dmz_target *dmz = ti->private; | |
bd5c4031 | 693 | struct dm_dev *ddev; |
3b1a94c8 DLM |
694 | struct dmz_dev *dev; |
695 | int ret; | |
bd5c4031 | 696 | struct block_device *bdev; |
3b1a94c8 DLM |
697 | |
698 | /* Get the target device */ | |
bd5c4031 | 699 | ret = dm_get_device(ti, path, dm_table_get_mode(ti->table), &ddev); |
3b1a94c8 DLM |
700 | if (ret) { |
701 | ti->error = "Get target device failed"; | |
3b1a94c8 DLM |
702 | return ret; |
703 | } | |
704 | ||
bd5c4031 HR |
705 | bdev = ddev->bdev; |
706 | if (bdev_zoned_model(bdev) == BLK_ZONED_NONE) { | |
707 | if (nr_devs == 1) { | |
708 | ti->error = "Invalid regular device"; | |
709 | goto err; | |
710 | } | |
711 | if (idx != 0) { | |
712 | ti->error = "First device must be a regular device"; | |
713 | goto err; | |
714 | } | |
715 | if (dmz->ddev[0]) { | |
716 | ti->error = "Too many regular devices"; | |
717 | goto err; | |
718 | } | |
719 | dev = &dmz->dev[idx]; | |
720 | dev->flags = DMZ_BDEV_REGULAR; | |
721 | } else { | |
722 | if (dmz->ddev[idx]) { | |
723 | ti->error = "Too many zoned devices"; | |
724 | goto err; | |
725 | } | |
726 | if (nr_devs > 1 && idx == 0) { | |
727 | ti->error = "First device must be a regular device"; | |
728 | goto err; | |
729 | } | |
730 | dev = &dmz->dev[idx]; | |
3b1a94c8 | 731 | } |
bd5c4031 | 732 | dev->bdev = bdev; |
69875d44 | 733 | dev->dev_idx = idx; |
3b1a94c8 DLM |
734 | (void)bdevname(dev->bdev, dev->name); |
735 | ||
bd5c4031 HR |
736 | dev->capacity = i_size_read(bdev->bd_inode) >> SECTOR_SHIFT; |
737 | if (ti->begin) { | |
738 | ti->error = "Partial mapping is not supported"; | |
3b1a94c8 DLM |
739 | goto err; |
740 | } | |
741 | ||
bd5c4031 | 742 | dmz->ddev[idx] = ddev; |
3b1a94c8 DLM |
743 | |
744 | return 0; | |
745 | err: | |
bd5c4031 HR |
746 | dm_put_device(ti, ddev); |
747 | return -EINVAL; | |
3b1a94c8 DLM |
748 | } |
749 | ||
750 | /* | |
751 | * Cleanup zoned device information. | |
752 | */ | |
753 | static void dmz_put_zoned_device(struct dm_target *ti) | |
754 | { | |
755 | struct dmz_target *dmz = ti->private; | |
bd5c4031 | 756 | int i; |
3b1a94c8 | 757 | |
4dba1288 | 758 | for (i = 0; i < dmz->nr_ddevs; i++) { |
bd5c4031 HR |
759 | if (dmz->ddev[i]) { |
760 | dm_put_device(ti, dmz->ddev[i]); | |
761 | dmz->ddev[i] = NULL; | |
762 | } | |
763 | } | |
764 | } | |
765 | ||
766 | static int dmz_fixup_devices(struct dm_target *ti) | |
767 | { | |
768 | struct dmz_target *dmz = ti->private; | |
769 | struct dmz_dev *reg_dev, *zoned_dev; | |
770 | struct request_queue *q; | |
4dba1288 HR |
771 | sector_t zone_nr_sectors = 0; |
772 | int i; | |
bd5c4031 HR |
773 | |
774 | /* | |
4dba1288 HR |
775 | * When we have more than on devices, the first one must be a |
776 | * regular block device and the others zoned block devices. | |
bd5c4031 | 777 | */ |
4dba1288 | 778 | if (dmz->nr_ddevs > 1) { |
bd5c4031 HR |
779 | reg_dev = &dmz->dev[0]; |
780 | if (!(reg_dev->flags & DMZ_BDEV_REGULAR)) { | |
781 | ti->error = "Primary disk is not a regular device"; | |
782 | return -EINVAL; | |
783 | } | |
4dba1288 HR |
784 | for (i = 1; i < dmz->nr_ddevs; i++) { |
785 | zoned_dev = &dmz->dev[i]; | |
786 | if (zoned_dev->flags & DMZ_BDEV_REGULAR) { | |
787 | ti->error = "Secondary disk is not a zoned device"; | |
788 | return -EINVAL; | |
789 | } | |
790 | q = bdev_get_queue(zoned_dev->bdev); | |
791 | if (zone_nr_sectors && | |
792 | zone_nr_sectors != blk_queue_zone_sectors(q)) { | |
793 | ti->error = "Zone nr sectors mismatch"; | |
794 | return -EINVAL; | |
795 | } | |
796 | zone_nr_sectors = blk_queue_zone_sectors(q); | |
797 | zoned_dev->zone_nr_sectors = zone_nr_sectors; | |
798 | zoned_dev->nr_zones = | |
799 | blkdev_nr_zones(zoned_dev->bdev->bd_disk); | |
bd5c4031 HR |
800 | } |
801 | } else { | |
802 | reg_dev = NULL; | |
803 | zoned_dev = &dmz->dev[0]; | |
804 | if (zoned_dev->flags & DMZ_BDEV_REGULAR) { | |
805 | ti->error = "Disk is not a zoned device"; | |
806 | return -EINVAL; | |
807 | } | |
4dba1288 HR |
808 | q = bdev_get_queue(zoned_dev->bdev); |
809 | zoned_dev->zone_nr_sectors = blk_queue_zone_sectors(q); | |
810 | zoned_dev->nr_zones = blkdev_nr_zones(zoned_dev->bdev->bd_disk); | |
bd5c4031 | 811 | } |
bd5c4031 HR |
812 | |
813 | if (reg_dev) { | |
4dba1288 HR |
814 | sector_t zone_offset; |
815 | ||
816 | reg_dev->zone_nr_sectors = zone_nr_sectors; | |
42c689f6 NC |
817 | reg_dev->nr_zones = |
818 | DIV_ROUND_UP_SECTOR_T(reg_dev->capacity, | |
819 | reg_dev->zone_nr_sectors); | |
4dba1288 HR |
820 | reg_dev->zone_offset = 0; |
821 | zone_offset = reg_dev->nr_zones; | |
822 | for (i = 1; i < dmz->nr_ddevs; i++) { | |
823 | dmz->dev[i].zone_offset = zone_offset; | |
824 | zone_offset += dmz->dev[i].nr_zones; | |
825 | } | |
bd5c4031 HR |
826 | } |
827 | return 0; | |
3b1a94c8 DLM |
828 | } |
829 | ||
830 | /* | |
831 | * Setup target. | |
832 | */ | |
833 | static int dmz_ctr(struct dm_target *ti, unsigned int argc, char **argv) | |
834 | { | |
835 | struct dmz_target *dmz; | |
f97809ae | 836 | int ret, i; |
3b1a94c8 DLM |
837 | |
838 | /* Check arguments */ | |
4dba1288 | 839 | if (argc < 1) { |
3b1a94c8 DLM |
840 | ti->error = "Invalid argument count"; |
841 | return -EINVAL; | |
842 | } | |
843 | ||
844 | /* Allocate and initialize the target descriptor */ | |
845 | dmz = kzalloc(sizeof(struct dmz_target), GFP_KERNEL); | |
846 | if (!dmz) { | |
847 | ti->error = "Unable to allocate the zoned target descriptor"; | |
848 | return -ENOMEM; | |
849 | } | |
4dba1288 | 850 | dmz->dev = kcalloc(argc, sizeof(struct dmz_dev), GFP_KERNEL); |
bd5c4031 HR |
851 | if (!dmz->dev) { |
852 | ti->error = "Unable to allocate the zoned device descriptors"; | |
853 | kfree(dmz); | |
854 | return -ENOMEM; | |
855 | } | |
4dba1288 HR |
856 | dmz->ddev = kcalloc(argc, sizeof(struct dm_dev *), GFP_KERNEL); |
857 | if (!dmz->ddev) { | |
858 | ti->error = "Unable to allocate the dm device descriptors"; | |
859 | ret = -ENOMEM; | |
860 | goto err; | |
861 | } | |
f97809ae | 862 | dmz->nr_ddevs = argc; |
4dba1288 | 863 | |
3b1a94c8 DLM |
864 | ti->private = dmz; |
865 | ||
866 | /* Get the target zoned block device */ | |
4dba1288 HR |
867 | for (i = 0; i < argc; i++) { |
868 | ret = dmz_get_zoned_device(ti, argv[i], i, argc); | |
869 | if (ret) | |
870 | goto err_dev; | |
bd5c4031 HR |
871 | } |
872 | ret = dmz_fixup_devices(ti); | |
4dba1288 HR |
873 | if (ret) |
874 | goto err_dev; | |
3b1a94c8 DLM |
875 | |
876 | /* Initialize metadata */ | |
bd5c4031 | 877 | ret = dmz_ctr_metadata(dmz->dev, argc, &dmz->metadata, |
2234e732 | 878 | dm_table_device_name(ti->table)); |
3b1a94c8 DLM |
879 | if (ret) { |
880 | ti->error = "Metadata initialization failed"; | |
881 | goto err_dev; | |
882 | } | |
883 | ||
884 | /* Set target (no write same support) */ | |
7b237748 | 885 | ti->max_io_len = dmz_zone_nr_sectors(dmz->metadata); |
3b1a94c8 DLM |
886 | ti->num_flush_bios = 1; |
887 | ti->num_discard_bios = 1; | |
888 | ti->num_write_zeroes_bios = 1; | |
889 | ti->per_io_data_size = sizeof(struct dmz_bioctx); | |
890 | ti->flush_supported = true; | |
891 | ti->discards_supported = true; | |
3b1a94c8 DLM |
892 | |
893 | /* The exposed capacity is the number of chunks that can be mapped */ | |
36820560 HR |
894 | ti->len = (sector_t)dmz_nr_chunks(dmz->metadata) << |
895 | dmz_zone_nr_sectors_shift(dmz->metadata); | |
3b1a94c8 DLM |
896 | |
897 | /* Zone BIO */ | |
6f1c819c KO |
898 | ret = bioset_init(&dmz->bio_set, DMZ_MIN_BIOS, 0, 0); |
899 | if (ret) { | |
3b1a94c8 | 900 | ti->error = "Create BIO set failed"; |
3b1a94c8 DLM |
901 | goto err_meta; |
902 | } | |
903 | ||
904 | /* Chunk BIO work */ | |
905 | mutex_init(&dmz->chunk_lock); | |
2d0b2d64 | 906 | INIT_RADIX_TREE(&dmz->chunk_rxtree, GFP_NOIO); |
2234e732 HR |
907 | dmz->chunk_wq = alloc_workqueue("dmz_cwq_%s", |
908 | WQ_MEM_RECLAIM | WQ_UNBOUND, 0, | |
909 | dmz_metadata_label(dmz->metadata)); | |
3b1a94c8 DLM |
910 | if (!dmz->chunk_wq) { |
911 | ti->error = "Create chunk workqueue failed"; | |
912 | ret = -ENOMEM; | |
913 | goto err_bio; | |
914 | } | |
915 | ||
916 | /* Flush work */ | |
917 | spin_lock_init(&dmz->flush_lock); | |
918 | bio_list_init(&dmz->flush_list); | |
919 | INIT_DELAYED_WORK(&dmz->flush_work, dmz_flush_work); | |
920 | dmz->flush_wq = alloc_ordered_workqueue("dmz_fwq_%s", WQ_MEM_RECLAIM, | |
2234e732 | 921 | dmz_metadata_label(dmz->metadata)); |
3b1a94c8 DLM |
922 | if (!dmz->flush_wq) { |
923 | ti->error = "Create flush workqueue failed"; | |
924 | ret = -ENOMEM; | |
925 | goto err_cwq; | |
926 | } | |
927 | mod_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD); | |
928 | ||
929 | /* Initialize reclaim */ | |
f97809ae HR |
930 | for (i = 0; i < dmz->nr_ddevs; i++) { |
931 | ret = dmz_ctr_reclaim(dmz->metadata, &dmz->dev[i].reclaim, i); | |
932 | if (ret) { | |
933 | ti->error = "Zone reclaim initialization failed"; | |
934 | goto err_fwq; | |
935 | } | |
3b1a94c8 DLM |
936 | } |
937 | ||
2234e732 HR |
938 | DMINFO("(%s): Target device: %llu 512-byte logical sectors (%llu blocks)", |
939 | dmz_metadata_label(dmz->metadata), | |
940 | (unsigned long long)ti->len, | |
941 | (unsigned long long)dmz_sect2blk(ti->len)); | |
3b1a94c8 DLM |
942 | |
943 | return 0; | |
944 | err_fwq: | |
945 | destroy_workqueue(dmz->flush_wq); | |
946 | err_cwq: | |
947 | destroy_workqueue(dmz->chunk_wq); | |
948 | err_bio: | |
d5ffebdd | 949 | mutex_destroy(&dmz->chunk_lock); |
6f1c819c | 950 | bioset_exit(&dmz->bio_set); |
3b1a94c8 DLM |
951 | err_meta: |
952 | dmz_dtr_metadata(dmz->metadata); | |
953 | err_dev: | |
954 | dmz_put_zoned_device(ti); | |
955 | err: | |
bd5c4031 | 956 | kfree(dmz->dev); |
3b1a94c8 DLM |
957 | kfree(dmz); |
958 | ||
959 | return ret; | |
960 | } | |
961 | ||
962 | /* | |
963 | * Cleanup target. | |
964 | */ | |
965 | static void dmz_dtr(struct dm_target *ti) | |
966 | { | |
967 | struct dmz_target *dmz = ti->private; | |
f97809ae | 968 | int i; |
3b1a94c8 DLM |
969 | |
970 | flush_workqueue(dmz->chunk_wq); | |
971 | destroy_workqueue(dmz->chunk_wq); | |
972 | ||
f97809ae HR |
973 | for (i = 0; i < dmz->nr_ddevs; i++) |
974 | dmz_dtr_reclaim(dmz->dev[i].reclaim); | |
3b1a94c8 DLM |
975 | |
976 | cancel_delayed_work_sync(&dmz->flush_work); | |
977 | destroy_workqueue(dmz->flush_wq); | |
978 | ||
979 | (void) dmz_flush_metadata(dmz->metadata); | |
980 | ||
981 | dmz_dtr_metadata(dmz->metadata); | |
982 | ||
6f1c819c | 983 | bioset_exit(&dmz->bio_set); |
3b1a94c8 DLM |
984 | |
985 | dmz_put_zoned_device(ti); | |
986 | ||
d5ffebdd MS |
987 | mutex_destroy(&dmz->chunk_lock); |
988 | ||
bd5c4031 | 989 | kfree(dmz->dev); |
3b1a94c8 DLM |
990 | kfree(dmz); |
991 | } | |
992 | ||
993 | /* | |
994 | * Setup target request queue limits. | |
995 | */ | |
996 | static void dmz_io_hints(struct dm_target *ti, struct queue_limits *limits) | |
997 | { | |
998 | struct dmz_target *dmz = ti->private; | |
36820560 | 999 | unsigned int chunk_sectors = dmz_zone_nr_sectors(dmz->metadata); |
3b1a94c8 DLM |
1000 | |
1001 | limits->logical_block_size = DMZ_BLOCK_SIZE; | |
1002 | limits->physical_block_size = DMZ_BLOCK_SIZE; | |
1003 | ||
1004 | blk_limits_io_min(limits, DMZ_BLOCK_SIZE); | |
1005 | blk_limits_io_opt(limits, DMZ_BLOCK_SIZE); | |
1006 | ||
1007 | limits->discard_alignment = DMZ_BLOCK_SIZE; | |
1008 | limits->discard_granularity = DMZ_BLOCK_SIZE; | |
1009 | limits->max_discard_sectors = chunk_sectors; | |
1010 | limits->max_hw_discard_sectors = chunk_sectors; | |
1011 | limits->max_write_zeroes_sectors = chunk_sectors; | |
1012 | ||
1013 | /* FS hint to try to align to the device zone size */ | |
1014 | limits->chunk_sectors = chunk_sectors; | |
1015 | limits->max_sectors = chunk_sectors; | |
1016 | ||
1017 | /* We are exposing a drive-managed zoned block device */ | |
1018 | limits->zoned = BLK_ZONED_NONE; | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * Pass on ioctl to the backend device. | |
1023 | */ | |
5bd5e8d8 | 1024 | static int dmz_prepare_ioctl(struct dm_target *ti, struct block_device **bdev) |
3b1a94c8 DLM |
1025 | { |
1026 | struct dmz_target *dmz = ti->private; | |
52d67758 | 1027 | struct dmz_dev *dev = &dmz->dev[0]; |
3b1a94c8 | 1028 | |
52d67758 | 1029 | if (!dmz_check_bdev(dev)) |
e7fad909 | 1030 | return -EIO; |
75d66ffb | 1031 | |
52d67758 | 1032 | *bdev = dev->bdev; |
3b1a94c8 DLM |
1033 | |
1034 | return 0; | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * Stop works on suspend. | |
1039 | */ | |
1040 | static void dmz_suspend(struct dm_target *ti) | |
1041 | { | |
1042 | struct dmz_target *dmz = ti->private; | |
f97809ae | 1043 | int i; |
3b1a94c8 DLM |
1044 | |
1045 | flush_workqueue(dmz->chunk_wq); | |
f97809ae HR |
1046 | for (i = 0; i < dmz->nr_ddevs; i++) |
1047 | dmz_suspend_reclaim(dmz->dev[i].reclaim); | |
3b1a94c8 DLM |
1048 | cancel_delayed_work_sync(&dmz->flush_work); |
1049 | } | |
1050 | ||
1051 | /* | |
1052 | * Restart works on resume or if suspend failed. | |
1053 | */ | |
1054 | static void dmz_resume(struct dm_target *ti) | |
1055 | { | |
1056 | struct dmz_target *dmz = ti->private; | |
f97809ae | 1057 | int i; |
3b1a94c8 DLM |
1058 | |
1059 | queue_delayed_work(dmz->flush_wq, &dmz->flush_work, DMZ_FLUSH_PERIOD); | |
f97809ae HR |
1060 | for (i = 0; i < dmz->nr_ddevs; i++) |
1061 | dmz_resume_reclaim(dmz->dev[i].reclaim); | |
3b1a94c8 DLM |
1062 | } |
1063 | ||
1064 | static int dmz_iterate_devices(struct dm_target *ti, | |
1065 | iterate_devices_callout_fn fn, void *data) | |
1066 | { | |
1067 | struct dmz_target *dmz = ti->private; | |
bd5c4031 HR |
1068 | unsigned int zone_nr_sectors = dmz_zone_nr_sectors(dmz->metadata); |
1069 | sector_t capacity; | |
4dba1288 | 1070 | int i, r; |
bd5c4031 | 1071 | |
4dba1288 HR |
1072 | for (i = 0; i < dmz->nr_ddevs; i++) { |
1073 | capacity = dmz->dev[i].capacity & ~(zone_nr_sectors - 1); | |
1074 | r = fn(ti, dmz->ddev[i], 0, capacity, data); | |
1075 | if (r) | |
1076 | break; | |
bd5c4031 HR |
1077 | } |
1078 | return r; | |
3b1a94c8 DLM |
1079 | } |
1080 | ||
bc3d5717 HR |
1081 | static void dmz_status(struct dm_target *ti, status_type_t type, |
1082 | unsigned int status_flags, char *result, | |
1083 | unsigned int maxlen) | |
1084 | { | |
1085 | struct dmz_target *dmz = ti->private; | |
1086 | ssize_t sz = 0; | |
1087 | char buf[BDEVNAME_SIZE]; | |
bd5c4031 | 1088 | struct dmz_dev *dev; |
bd82fdab | 1089 | int i; |
bc3d5717 HR |
1090 | |
1091 | switch (type) { | |
1092 | case STATUSTYPE_INFO: | |
bd82fdab | 1093 | DMEMIT("%u zones %u/%u cache", |
bc3d5717 | 1094 | dmz_nr_zones(dmz->metadata), |
34f5affd | 1095 | dmz_nr_unmap_cache_zones(dmz->metadata), |
bd82fdab | 1096 | dmz_nr_cache_zones(dmz->metadata)); |
4dba1288 | 1097 | for (i = 0; i < dmz->nr_ddevs; i++) { |
bd82fdab HR |
1098 | /* |
1099 | * For a multi-device setup the first device | |
1100 | * contains only cache zones. | |
1101 | */ | |
1102 | if ((i == 0) && | |
1103 | (dmz_nr_cache_zones(dmz->metadata) > 0)) | |
1104 | continue; | |
1105 | DMEMIT(" %u/%u random %u/%u sequential", | |
1106 | dmz_nr_unmap_rnd_zones(dmz->metadata, i), | |
1107 | dmz_nr_rnd_zones(dmz->metadata, i), | |
1108 | dmz_nr_unmap_seq_zones(dmz->metadata, i), | |
1109 | dmz_nr_seq_zones(dmz->metadata, i)); | |
1110 | } | |
bc3d5717 HR |
1111 | break; |
1112 | case STATUSTYPE_TABLE: | |
bd5c4031 HR |
1113 | dev = &dmz->dev[0]; |
1114 | format_dev_t(buf, dev->bdev->bd_dev); | |
bc3d5717 | 1115 | DMEMIT("%s", buf); |
4dba1288 HR |
1116 | for (i = 1; i < dmz->nr_ddevs; i++) { |
1117 | dev = &dmz->dev[i]; | |
bd5c4031 HR |
1118 | format_dev_t(buf, dev->bdev->bd_dev); |
1119 | DMEMIT(" %s", buf); | |
1120 | } | |
bc3d5717 HR |
1121 | break; |
1122 | } | |
1123 | return; | |
1124 | } | |
1125 | ||
90b39d58 HR |
1126 | static int dmz_message(struct dm_target *ti, unsigned int argc, char **argv, |
1127 | char *result, unsigned int maxlen) | |
1128 | { | |
1129 | struct dmz_target *dmz = ti->private; | |
1130 | int r = -EINVAL; | |
1131 | ||
1132 | if (!strcasecmp(argv[0], "reclaim")) { | |
f97809ae HR |
1133 | int i; |
1134 | ||
1135 | for (i = 0; i < dmz->nr_ddevs; i++) | |
1136 | dmz_schedule_reclaim(dmz->dev[i].reclaim); | |
90b39d58 HR |
1137 | r = 0; |
1138 | } else | |
1139 | DMERR("unrecognized message %s", argv[0]); | |
1140 | return r; | |
1141 | } | |
1142 | ||
3b1a94c8 DLM |
1143 | static struct target_type dmz_type = { |
1144 | .name = "zoned", | |
bd5c4031 | 1145 | .version = {2, 0, 0}, |
2d669ceb | 1146 | .features = DM_TARGET_SINGLETON | DM_TARGET_MIXED_ZONED_MODEL, |
3b1a94c8 DLM |
1147 | .module = THIS_MODULE, |
1148 | .ctr = dmz_ctr, | |
1149 | .dtr = dmz_dtr, | |
1150 | .map = dmz_map, | |
3b1a94c8 DLM |
1151 | .io_hints = dmz_io_hints, |
1152 | .prepare_ioctl = dmz_prepare_ioctl, | |
1153 | .postsuspend = dmz_suspend, | |
1154 | .resume = dmz_resume, | |
1155 | .iterate_devices = dmz_iterate_devices, | |
bc3d5717 | 1156 | .status = dmz_status, |
90b39d58 | 1157 | .message = dmz_message, |
3b1a94c8 DLM |
1158 | }; |
1159 | ||
1160 | static int __init dmz_init(void) | |
1161 | { | |
1162 | return dm_register_target(&dmz_type); | |
1163 | } | |
1164 | ||
1165 | static void __exit dmz_exit(void) | |
1166 | { | |
1167 | dm_unregister_target(&dmz_type); | |
1168 | } | |
1169 | ||
1170 | module_init(dmz_init); | |
1171 | module_exit(dmz_exit); | |
1172 | ||
1173 | MODULE_DESCRIPTION(DM_NAME " target for zoned block devices"); | |
1174 | MODULE_AUTHOR("Damien Le Moal <damien.lemoal@wdc.com>"); | |
1175 | MODULE_LICENSE("GPL"); |