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6a0cb1bc HR |
1 | /* |
2 | * Zoned block device handling | |
3 | * | |
4 | * Copyright (c) 2015, Hannes Reinecke | |
5 | * Copyright (c) 2015, SUSE Linux GmbH | |
6 | * | |
7 | * Copyright (c) 2016, Damien Le Moal | |
8 | * Copyright (c) 2016, Western Digital | |
9 | */ | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/rbtree.h> | |
14 | #include <linux/blkdev.h> | |
15 | ||
16 | static inline sector_t blk_zone_start(struct request_queue *q, | |
17 | sector_t sector) | |
18 | { | |
f99e8648 | 19 | sector_t zone_mask = blk_queue_zone_sectors(q) - 1; |
6a0cb1bc HR |
20 | |
21 | return sector & ~zone_mask; | |
22 | } | |
23 | ||
6cc77e9c CH |
24 | /* |
25 | * Return true if a request is a write requests that needs zone write locking. | |
26 | */ | |
27 | bool blk_req_needs_zone_write_lock(struct request *rq) | |
28 | { | |
29 | if (!rq->q->seq_zones_wlock) | |
30 | return false; | |
31 | ||
32 | if (blk_rq_is_passthrough(rq)) | |
33 | return false; | |
34 | ||
35 | switch (req_op(rq)) { | |
36 | case REQ_OP_WRITE_ZEROES: | |
37 | case REQ_OP_WRITE_SAME: | |
38 | case REQ_OP_WRITE: | |
39 | return blk_rq_zone_is_seq(rq); | |
40 | default: | |
41 | return false; | |
42 | } | |
43 | } | |
44 | EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock); | |
45 | ||
46 | void __blk_req_zone_write_lock(struct request *rq) | |
47 | { | |
48 | if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq), | |
49 | rq->q->seq_zones_wlock))) | |
50 | return; | |
51 | ||
52 | WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED); | |
53 | rq->rq_flags |= RQF_ZONE_WRITE_LOCKED; | |
54 | } | |
55 | EXPORT_SYMBOL_GPL(__blk_req_zone_write_lock); | |
56 | ||
57 | void __blk_req_zone_write_unlock(struct request *rq) | |
58 | { | |
59 | rq->rq_flags &= ~RQF_ZONE_WRITE_LOCKED; | |
60 | if (rq->q->seq_zones_wlock) | |
61 | WARN_ON_ONCE(!test_and_clear_bit(blk_rq_zone_no(rq), | |
62 | rq->q->seq_zones_wlock)); | |
63 | } | |
64 | EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock); | |
65 | ||
6a0cb1bc HR |
66 | /* |
67 | * Check that a zone report belongs to the partition. | |
68 | * If yes, fix its start sector and write pointer, copy it in the | |
69 | * zone information array and return true. Return false otherwise. | |
70 | */ | |
71 | static bool blkdev_report_zone(struct block_device *bdev, | |
72 | struct blk_zone *rep, | |
73 | struct blk_zone *zone) | |
74 | { | |
75 | sector_t offset = get_start_sect(bdev); | |
76 | ||
77 | if (rep->start < offset) | |
78 | return false; | |
79 | ||
80 | rep->start -= offset; | |
81 | if (rep->start + rep->len > bdev->bd_part->nr_sects) | |
82 | return false; | |
83 | ||
84 | if (rep->type == BLK_ZONE_TYPE_CONVENTIONAL) | |
85 | rep->wp = rep->start + rep->len; | |
86 | else | |
87 | rep->wp -= offset; | |
88 | memcpy(zone, rep, sizeof(struct blk_zone)); | |
89 | ||
90 | return true; | |
91 | } | |
92 | ||
93 | /** | |
94 | * blkdev_report_zones - Get zones information | |
95 | * @bdev: Target block device | |
96 | * @sector: Sector from which to report zones | |
97 | * @zones: Array of zone structures where to return the zones information | |
98 | * @nr_zones: Number of zone structures in the zone array | |
99 | * @gfp_mask: Memory allocation flags (for bio_alloc) | |
100 | * | |
101 | * Description: | |
102 | * Get zone information starting from the zone containing @sector. | |
103 | * The number of zone information reported may be less than the number | |
104 | * requested by @nr_zones. The number of zones actually reported is | |
105 | * returned in @nr_zones. | |
106 | */ | |
107 | int blkdev_report_zones(struct block_device *bdev, | |
108 | sector_t sector, | |
109 | struct blk_zone *zones, | |
110 | unsigned int *nr_zones, | |
111 | gfp_t gfp_mask) | |
112 | { | |
113 | struct request_queue *q = bdev_get_queue(bdev); | |
114 | struct blk_zone_report_hdr *hdr; | |
115 | unsigned int nrz = *nr_zones; | |
116 | struct page *page; | |
117 | unsigned int nr_rep; | |
118 | size_t rep_bytes; | |
119 | unsigned int nr_pages; | |
120 | struct bio *bio; | |
121 | struct bio_vec *bv; | |
122 | unsigned int i, n, nz; | |
123 | unsigned int ofst; | |
124 | void *addr; | |
3c4da758 | 125 | int ret; |
6a0cb1bc HR |
126 | |
127 | if (!q) | |
128 | return -ENXIO; | |
129 | ||
130 | if (!blk_queue_is_zoned(q)) | |
131 | return -EOPNOTSUPP; | |
132 | ||
133 | if (!nrz) | |
134 | return 0; | |
135 | ||
136 | if (sector > bdev->bd_part->nr_sects) { | |
137 | *nr_zones = 0; | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* | |
142 | * The zone report has a header. So make room for it in the | |
143 | * payload. Also make sure that the report fits in a single BIO | |
144 | * that will not be split down the stack. | |
145 | */ | |
146 | rep_bytes = sizeof(struct blk_zone_report_hdr) + | |
147 | sizeof(struct blk_zone) * nrz; | |
148 | rep_bytes = (rep_bytes + PAGE_SIZE - 1) & PAGE_MASK; | |
149 | if (rep_bytes > (queue_max_sectors(q) << 9)) | |
150 | rep_bytes = queue_max_sectors(q) << 9; | |
151 | ||
152 | nr_pages = min_t(unsigned int, BIO_MAX_PAGES, | |
153 | rep_bytes >> PAGE_SHIFT); | |
154 | nr_pages = min_t(unsigned int, nr_pages, | |
155 | queue_max_segments(q)); | |
156 | ||
157 | bio = bio_alloc(gfp_mask, nr_pages); | |
158 | if (!bio) | |
159 | return -ENOMEM; | |
160 | ||
74d46992 | 161 | bio_set_dev(bio, bdev); |
6a0cb1bc HR |
162 | bio->bi_iter.bi_sector = blk_zone_start(q, sector); |
163 | bio_set_op_attrs(bio, REQ_OP_ZONE_REPORT, 0); | |
164 | ||
165 | for (i = 0; i < nr_pages; i++) { | |
166 | page = alloc_page(gfp_mask); | |
167 | if (!page) { | |
168 | ret = -ENOMEM; | |
169 | goto out; | |
170 | } | |
171 | if (!bio_add_page(bio, page, PAGE_SIZE, 0)) { | |
172 | __free_page(page); | |
173 | break; | |
174 | } | |
175 | } | |
176 | ||
177 | if (i == 0) | |
178 | ret = -ENOMEM; | |
179 | else | |
180 | ret = submit_bio_wait(bio); | |
181 | if (ret) | |
182 | goto out; | |
183 | ||
184 | /* | |
185 | * Process the report result: skip the header and go through the | |
186 | * reported zones to fixup and fixup the zone information for | |
187 | * partitions. At the same time, return the zone information into | |
188 | * the zone array. | |
189 | */ | |
190 | n = 0; | |
191 | nz = 0; | |
192 | nr_rep = 0; | |
193 | bio_for_each_segment_all(bv, bio, i) { | |
194 | ||
195 | if (!bv->bv_page) | |
196 | break; | |
197 | ||
198 | addr = kmap_atomic(bv->bv_page); | |
199 | ||
200 | /* Get header in the first page */ | |
201 | ofst = 0; | |
202 | if (!nr_rep) { | |
203 | hdr = (struct blk_zone_report_hdr *) addr; | |
204 | nr_rep = hdr->nr_zones; | |
205 | ofst = sizeof(struct blk_zone_report_hdr); | |
206 | } | |
207 | ||
208 | /* Fixup and report zones */ | |
209 | while (ofst < bv->bv_len && | |
210 | n < nr_rep && nz < nrz) { | |
211 | if (blkdev_report_zone(bdev, addr + ofst, &zones[nz])) | |
212 | nz++; | |
213 | ofst += sizeof(struct blk_zone); | |
214 | n++; | |
215 | } | |
216 | ||
217 | kunmap_atomic(addr); | |
218 | ||
219 | if (n >= nr_rep || nz >= nrz) | |
220 | break; | |
221 | ||
222 | } | |
223 | ||
3c4da758 | 224 | *nr_zones = nz; |
6a0cb1bc HR |
225 | out: |
226 | bio_for_each_segment_all(bv, bio, i) | |
227 | __free_page(bv->bv_page); | |
228 | bio_put(bio); | |
229 | ||
6a0cb1bc HR |
230 | return ret; |
231 | } | |
232 | EXPORT_SYMBOL_GPL(blkdev_report_zones); | |
233 | ||
234 | /** | |
235 | * blkdev_reset_zones - Reset zones write pointer | |
236 | * @bdev: Target block device | |
237 | * @sector: Start sector of the first zone to reset | |
238 | * @nr_sectors: Number of sectors, at least the length of one zone | |
239 | * @gfp_mask: Memory allocation flags (for bio_alloc) | |
240 | * | |
241 | * Description: | |
242 | * Reset the write pointer of the zones contained in the range | |
243 | * @sector..@sector+@nr_sectors. Specifying the entire disk sector range | |
244 | * is valid, but the specified range should not contain conventional zones. | |
245 | */ | |
246 | int blkdev_reset_zones(struct block_device *bdev, | |
247 | sector_t sector, sector_t nr_sectors, | |
248 | gfp_t gfp_mask) | |
249 | { | |
250 | struct request_queue *q = bdev_get_queue(bdev); | |
251 | sector_t zone_sectors; | |
252 | sector_t end_sector = sector + nr_sectors; | |
253 | struct bio *bio; | |
254 | int ret; | |
255 | ||
256 | if (!q) | |
257 | return -ENXIO; | |
258 | ||
259 | if (!blk_queue_is_zoned(q)) | |
260 | return -EOPNOTSUPP; | |
261 | ||
262 | if (end_sector > bdev->bd_part->nr_sects) | |
263 | /* Out of range */ | |
264 | return -EINVAL; | |
265 | ||
266 | /* Check alignment (handle eventual smaller last zone) */ | |
f99e8648 | 267 | zone_sectors = blk_queue_zone_sectors(q); |
6a0cb1bc HR |
268 | if (sector & (zone_sectors - 1)) |
269 | return -EINVAL; | |
270 | ||
271 | if ((nr_sectors & (zone_sectors - 1)) && | |
272 | end_sector != bdev->bd_part->nr_sects) | |
273 | return -EINVAL; | |
274 | ||
275 | while (sector < end_sector) { | |
276 | ||
277 | bio = bio_alloc(gfp_mask, 0); | |
278 | bio->bi_iter.bi_sector = sector; | |
74d46992 | 279 | bio_set_dev(bio, bdev); |
6a0cb1bc HR |
280 | bio_set_op_attrs(bio, REQ_OP_ZONE_RESET, 0); |
281 | ||
282 | ret = submit_bio_wait(bio); | |
283 | bio_put(bio); | |
284 | ||
285 | if (ret) | |
286 | return ret; | |
287 | ||
288 | sector += zone_sectors; | |
289 | ||
290 | /* This may take a while, so be nice to others */ | |
291 | cond_resched(); | |
292 | ||
293 | } | |
294 | ||
295 | return 0; | |
296 | } | |
297 | EXPORT_SYMBOL_GPL(blkdev_reset_zones); | |
3ed05a98 ST |
298 | |
299 | /** | |
300 | * BLKREPORTZONE ioctl processing. | |
301 | * Called from blkdev_ioctl. | |
302 | */ | |
303 | int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, | |
304 | unsigned int cmd, unsigned long arg) | |
305 | { | |
306 | void __user *argp = (void __user *)arg; | |
307 | struct request_queue *q; | |
308 | struct blk_zone_report rep; | |
309 | struct blk_zone *zones; | |
310 | int ret; | |
311 | ||
312 | if (!argp) | |
313 | return -EINVAL; | |
314 | ||
315 | q = bdev_get_queue(bdev); | |
316 | if (!q) | |
317 | return -ENXIO; | |
318 | ||
319 | if (!blk_queue_is_zoned(q)) | |
320 | return -ENOTTY; | |
321 | ||
322 | if (!capable(CAP_SYS_ADMIN)) | |
323 | return -EACCES; | |
324 | ||
325 | if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report))) | |
326 | return -EFAULT; | |
327 | ||
328 | if (!rep.nr_zones) | |
329 | return -EINVAL; | |
330 | ||
331 | zones = kcalloc(rep.nr_zones, sizeof(struct blk_zone), GFP_KERNEL); | |
332 | if (!zones) | |
333 | return -ENOMEM; | |
334 | ||
335 | ret = blkdev_report_zones(bdev, rep.sector, | |
336 | zones, &rep.nr_zones, | |
337 | GFP_KERNEL); | |
338 | if (ret) | |
339 | goto out; | |
340 | ||
341 | if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) { | |
342 | ret = -EFAULT; | |
343 | goto out; | |
344 | } | |
345 | ||
346 | if (rep.nr_zones) { | |
347 | if (copy_to_user(argp + sizeof(struct blk_zone_report), zones, | |
348 | sizeof(struct blk_zone) * rep.nr_zones)) | |
349 | ret = -EFAULT; | |
350 | } | |
351 | ||
352 | out: | |
353 | kfree(zones); | |
354 | ||
355 | return ret; | |
356 | } | |
357 | ||
358 | /** | |
359 | * BLKRESETZONE ioctl processing. | |
360 | * Called from blkdev_ioctl. | |
361 | */ | |
362 | int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode, | |
363 | unsigned int cmd, unsigned long arg) | |
364 | { | |
365 | void __user *argp = (void __user *)arg; | |
366 | struct request_queue *q; | |
367 | struct blk_zone_range zrange; | |
368 | ||
369 | if (!argp) | |
370 | return -EINVAL; | |
371 | ||
372 | q = bdev_get_queue(bdev); | |
373 | if (!q) | |
374 | return -ENXIO; | |
375 | ||
376 | if (!blk_queue_is_zoned(q)) | |
377 | return -ENOTTY; | |
378 | ||
379 | if (!capable(CAP_SYS_ADMIN)) | |
380 | return -EACCES; | |
381 | ||
382 | if (!(mode & FMODE_WRITE)) | |
383 | return -EBADF; | |
384 | ||
385 | if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range))) | |
386 | return -EFAULT; | |
387 | ||
388 | return blkdev_reset_zones(bdev, zrange.sector, zrange.nr_sectors, | |
389 | GFP_KERNEL); | |
390 | } |