Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
f31e7e40 DM |
2 | /* |
3 | * Functions related to generic helpers functions | |
4 | */ | |
5 | #include <linux/kernel.h> | |
6 | #include <linux/module.h> | |
7 | #include <linux/bio.h> | |
8 | #include <linux/blkdev.h> | |
9 | #include <linux/scatterlist.h> | |
10 | ||
11 | #include "blk.h" | |
12 | ||
a2d6b3a2 | 13 | struct bio *blk_next_bio(struct bio *bio, unsigned int nr_pages, gfp_t gfp) |
f31e7e40 | 14 | { |
9082e87b CH |
15 | struct bio *new = bio_alloc(gfp, nr_pages); |
16 | ||
17 | if (bio) { | |
18 | bio_chain(bio, new); | |
4e49ea4a | 19 | submit_bio(bio); |
9082e87b | 20 | } |
5dba3089 | 21 | |
9082e87b | 22 | return new; |
f31e7e40 DM |
23 | } |
24 | ||
38f25255 | 25 | int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
288dab8a | 26 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
469e3216 | 27 | struct bio **biop) |
f31e7e40 | 28 | { |
f31e7e40 | 29 | struct request_queue *q = bdev_get_queue(bdev); |
38f25255 | 30 | struct bio *bio = *biop; |
ef295ecf | 31 | unsigned int op; |
28b2be20 | 32 | sector_t bs_mask; |
f31e7e40 DM |
33 | |
34 | if (!q) | |
35 | return -ENXIO; | |
288dab8a | 36 | |
a13553c7 ID |
37 | if (bdev_read_only(bdev)) |
38 | return -EPERM; | |
39 | ||
288dab8a CH |
40 | if (flags & BLKDEV_DISCARD_SECURE) { |
41 | if (!blk_queue_secure_erase(q)) | |
42 | return -EOPNOTSUPP; | |
43 | op = REQ_OP_SECURE_ERASE; | |
44 | } else { | |
45 | if (!blk_queue_discard(q)) | |
46 | return -EOPNOTSUPP; | |
47 | op = REQ_OP_DISCARD; | |
48 | } | |
f31e7e40 | 49 | |
28b2be20 DW |
50 | bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; |
51 | if ((sector | nr_sects) & bs_mask) | |
52 | return -EINVAL; | |
53 | ||
5dba3089 | 54 | while (nr_sects) { |
744889b7 ML |
55 | unsigned int req_sects = nr_sects; |
56 | sector_t end_sect; | |
c6e66634 | 57 | |
b88aef36 MP |
58 | if (!req_sects) |
59 | goto fail; | |
1adfc5e4 | 60 | req_sects = min(req_sects, bio_allowed_max_sectors(q)); |
a22c4d7e | 61 | |
c6e66634 | 62 | end_sect = sector + req_sects; |
c6e66634 | 63 | |
a2d6b3a2 | 64 | bio = blk_next_bio(bio, 0, gfp_mask); |
4f024f37 | 65 | bio->bi_iter.bi_sector = sector; |
74d46992 | 66 | bio_set_dev(bio, bdev); |
288dab8a | 67 | bio_set_op_attrs(bio, op, 0); |
f31e7e40 | 68 | |
4f024f37 | 69 | bio->bi_iter.bi_size = req_sects << 9; |
c6e66634 PB |
70 | nr_sects -= req_sects; |
71 | sector = end_sect; | |
f31e7e40 | 72 | |
c8123f8c JA |
73 | /* |
74 | * We can loop for a long time in here, if someone does | |
75 | * full device discards (like mkfs). Be nice and allow | |
76 | * us to schedule out to avoid softlocking if preempt | |
77 | * is disabled. | |
78 | */ | |
79 | cond_resched(); | |
5dba3089 | 80 | } |
38f25255 CH |
81 | |
82 | *biop = bio; | |
83 | return 0; | |
b88aef36 MP |
84 | |
85 | fail: | |
86 | if (bio) { | |
87 | submit_bio_wait(bio); | |
88 | bio_put(bio); | |
89 | } | |
90 | *biop = NULL; | |
91 | return -EOPNOTSUPP; | |
38f25255 CH |
92 | } |
93 | EXPORT_SYMBOL(__blkdev_issue_discard); | |
94 | ||
95 | /** | |
96 | * blkdev_issue_discard - queue a discard | |
97 | * @bdev: blockdev to issue discard for | |
98 | * @sector: start sector | |
99 | * @nr_sects: number of sectors to discard | |
100 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
e554911c | 101 | * @flags: BLKDEV_DISCARD_* flags to control behaviour |
38f25255 CH |
102 | * |
103 | * Description: | |
104 | * Issue a discard request for the sectors in question. | |
105 | */ | |
106 | int blkdev_issue_discard(struct block_device *bdev, sector_t sector, | |
107 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags) | |
108 | { | |
38f25255 CH |
109 | struct bio *bio = NULL; |
110 | struct blk_plug plug; | |
111 | int ret; | |
112 | ||
38f25255 | 113 | blk_start_plug(&plug); |
288dab8a | 114 | ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, flags, |
38f25255 | 115 | &bio); |
bbd848e0 | 116 | if (!ret && bio) { |
4e49ea4a | 117 | ret = submit_bio_wait(bio); |
48920ff2 | 118 | if (ret == -EOPNOTSUPP) |
bbd848e0 | 119 | ret = 0; |
05bd92dd | 120 | bio_put(bio); |
bbd848e0 | 121 | } |
0cfbcafc | 122 | blk_finish_plug(&plug); |
f31e7e40 | 123 | |
bbd848e0 | 124 | return ret; |
f31e7e40 DM |
125 | } |
126 | EXPORT_SYMBOL(blkdev_issue_discard); | |
3f14d792 | 127 | |
4363ac7c | 128 | /** |
e73c23ff | 129 | * __blkdev_issue_write_same - generate number of bios with same page |
4363ac7c MP |
130 | * @bdev: target blockdev |
131 | * @sector: start sector | |
132 | * @nr_sects: number of sectors to write | |
133 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
134 | * @page: page containing data to write | |
e73c23ff | 135 | * @biop: pointer to anchor bio |
4363ac7c MP |
136 | * |
137 | * Description: | |
e73c23ff | 138 | * Generate and issue number of bios(REQ_OP_WRITE_SAME) with same page. |
4363ac7c | 139 | */ |
e73c23ff CK |
140 | static int __blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
141 | sector_t nr_sects, gfp_t gfp_mask, struct page *page, | |
142 | struct bio **biop) | |
4363ac7c | 143 | { |
4363ac7c MP |
144 | struct request_queue *q = bdev_get_queue(bdev); |
145 | unsigned int max_write_same_sectors; | |
e73c23ff | 146 | struct bio *bio = *biop; |
28b2be20 | 147 | sector_t bs_mask; |
4363ac7c MP |
148 | |
149 | if (!q) | |
150 | return -ENXIO; | |
151 | ||
a13553c7 ID |
152 | if (bdev_read_only(bdev)) |
153 | return -EPERM; | |
154 | ||
28b2be20 DW |
155 | bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; |
156 | if ((sector | nr_sects) & bs_mask) | |
157 | return -EINVAL; | |
158 | ||
e73c23ff CK |
159 | if (!bdev_write_same(bdev)) |
160 | return -EOPNOTSUPP; | |
161 | ||
b49a0871 ML |
162 | /* Ensure that max_write_same_sectors doesn't overflow bi_size */ |
163 | max_write_same_sectors = UINT_MAX >> 9; | |
4363ac7c | 164 | |
4363ac7c | 165 | while (nr_sects) { |
a2d6b3a2 | 166 | bio = blk_next_bio(bio, 1, gfp_mask); |
4f024f37 | 167 | bio->bi_iter.bi_sector = sector; |
74d46992 | 168 | bio_set_dev(bio, bdev); |
4363ac7c MP |
169 | bio->bi_vcnt = 1; |
170 | bio->bi_io_vec->bv_page = page; | |
171 | bio->bi_io_vec->bv_offset = 0; | |
172 | bio->bi_io_vec->bv_len = bdev_logical_block_size(bdev); | |
95fe6c1a | 173 | bio_set_op_attrs(bio, REQ_OP_WRITE_SAME, 0); |
4363ac7c MP |
174 | |
175 | if (nr_sects > max_write_same_sectors) { | |
4f024f37 | 176 | bio->bi_iter.bi_size = max_write_same_sectors << 9; |
4363ac7c MP |
177 | nr_sects -= max_write_same_sectors; |
178 | sector += max_write_same_sectors; | |
179 | } else { | |
4f024f37 | 180 | bio->bi_iter.bi_size = nr_sects << 9; |
4363ac7c MP |
181 | nr_sects = 0; |
182 | } | |
e73c23ff | 183 | cond_resched(); |
4363ac7c MP |
184 | } |
185 | ||
e73c23ff CK |
186 | *biop = bio; |
187 | return 0; | |
188 | } | |
189 | ||
190 | /** | |
191 | * blkdev_issue_write_same - queue a write same operation | |
192 | * @bdev: target blockdev | |
193 | * @sector: start sector | |
194 | * @nr_sects: number of sectors to write | |
195 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
196 | * @page: page containing data | |
197 | * | |
198 | * Description: | |
199 | * Issue a write same request for the sectors in question. | |
200 | */ | |
201 | int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, | |
202 | sector_t nr_sects, gfp_t gfp_mask, | |
203 | struct page *page) | |
204 | { | |
205 | struct bio *bio = NULL; | |
206 | struct blk_plug plug; | |
207 | int ret; | |
208 | ||
209 | blk_start_plug(&plug); | |
210 | ret = __blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask, page, | |
211 | &bio); | |
212 | if (ret == 0 && bio) { | |
4e49ea4a | 213 | ret = submit_bio_wait(bio); |
05bd92dd ST |
214 | bio_put(bio); |
215 | } | |
e73c23ff | 216 | blk_finish_plug(&plug); |
3f40bf2c | 217 | return ret; |
4363ac7c MP |
218 | } |
219 | EXPORT_SYMBOL(blkdev_issue_write_same); | |
220 | ||
a6f0788e CK |
221 | static int __blkdev_issue_write_zeroes(struct block_device *bdev, |
222 | sector_t sector, sector_t nr_sects, gfp_t gfp_mask, | |
d928be9f | 223 | struct bio **biop, unsigned flags) |
a6f0788e CK |
224 | { |
225 | struct bio *bio = *biop; | |
226 | unsigned int max_write_zeroes_sectors; | |
227 | struct request_queue *q = bdev_get_queue(bdev); | |
228 | ||
229 | if (!q) | |
230 | return -ENXIO; | |
231 | ||
a13553c7 ID |
232 | if (bdev_read_only(bdev)) |
233 | return -EPERM; | |
234 | ||
a6f0788e CK |
235 | /* Ensure that max_write_zeroes_sectors doesn't overflow bi_size */ |
236 | max_write_zeroes_sectors = bdev_write_zeroes_sectors(bdev); | |
237 | ||
238 | if (max_write_zeroes_sectors == 0) | |
239 | return -EOPNOTSUPP; | |
240 | ||
241 | while (nr_sects) { | |
a2d6b3a2 | 242 | bio = blk_next_bio(bio, 0, gfp_mask); |
a6f0788e | 243 | bio->bi_iter.bi_sector = sector; |
74d46992 | 244 | bio_set_dev(bio, bdev); |
d928be9f CH |
245 | bio->bi_opf = REQ_OP_WRITE_ZEROES; |
246 | if (flags & BLKDEV_ZERO_NOUNMAP) | |
247 | bio->bi_opf |= REQ_NOUNMAP; | |
a6f0788e CK |
248 | |
249 | if (nr_sects > max_write_zeroes_sectors) { | |
250 | bio->bi_iter.bi_size = max_write_zeroes_sectors << 9; | |
251 | nr_sects -= max_write_zeroes_sectors; | |
252 | sector += max_write_zeroes_sectors; | |
253 | } else { | |
254 | bio->bi_iter.bi_size = nr_sects << 9; | |
255 | nr_sects = 0; | |
256 | } | |
257 | cond_resched(); | |
258 | } | |
259 | ||
260 | *biop = bio; | |
261 | return 0; | |
262 | } | |
263 | ||
615d22a5 DLM |
264 | /* |
265 | * Convert a number of 512B sectors to a number of pages. | |
266 | * The result is limited to a number of pages that can fit into a BIO. | |
267 | * Also make sure that the result is always at least 1 (page) for the cases | |
268 | * where nr_sects is lower than the number of sectors in a page. | |
269 | */ | |
270 | static unsigned int __blkdev_sectors_to_bio_pages(sector_t nr_sects) | |
271 | { | |
09c2c359 | 272 | sector_t pages = DIV_ROUND_UP_SECTOR_T(nr_sects, PAGE_SIZE / 512); |
615d22a5 | 273 | |
09c2c359 | 274 | return min(pages, (sector_t)BIO_MAX_PAGES); |
615d22a5 DLM |
275 | } |
276 | ||
425a4dba ID |
277 | static int __blkdev_issue_zero_pages(struct block_device *bdev, |
278 | sector_t sector, sector_t nr_sects, gfp_t gfp_mask, | |
279 | struct bio **biop) | |
280 | { | |
281 | struct request_queue *q = bdev_get_queue(bdev); | |
282 | struct bio *bio = *biop; | |
283 | int bi_size = 0; | |
284 | unsigned int sz; | |
285 | ||
286 | if (!q) | |
287 | return -ENXIO; | |
288 | ||
a13553c7 ID |
289 | if (bdev_read_only(bdev)) |
290 | return -EPERM; | |
291 | ||
425a4dba | 292 | while (nr_sects != 0) { |
a2d6b3a2 DLM |
293 | bio = blk_next_bio(bio, __blkdev_sectors_to_bio_pages(nr_sects), |
294 | gfp_mask); | |
425a4dba ID |
295 | bio->bi_iter.bi_sector = sector; |
296 | bio_set_dev(bio, bdev); | |
297 | bio_set_op_attrs(bio, REQ_OP_WRITE, 0); | |
298 | ||
299 | while (nr_sects != 0) { | |
300 | sz = min((sector_t) PAGE_SIZE, nr_sects << 9); | |
301 | bi_size = bio_add_page(bio, ZERO_PAGE(0), sz, 0); | |
302 | nr_sects -= bi_size >> 9; | |
303 | sector += bi_size >> 9; | |
304 | if (bi_size < sz) | |
305 | break; | |
306 | } | |
307 | cond_resched(); | |
308 | } | |
309 | ||
310 | *biop = bio; | |
311 | return 0; | |
312 | } | |
313 | ||
3f14d792 | 314 | /** |
e73c23ff | 315 | * __blkdev_issue_zeroout - generate number of zero filed write bios |
3f14d792 DM |
316 | * @bdev: blockdev to issue |
317 | * @sector: start sector | |
318 | * @nr_sects: number of sectors to write | |
319 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
e73c23ff | 320 | * @biop: pointer to anchor bio |
ee472d83 | 321 | * @flags: controls detailed behavior |
3f14d792 DM |
322 | * |
323 | * Description: | |
ee472d83 CH |
324 | * Zero-fill a block range, either using hardware offload or by explicitly |
325 | * writing zeroes to the device. | |
326 | * | |
327 | * If a device is using logical block provisioning, the underlying space will | |
328 | * not be released if %flags contains BLKDEV_ZERO_NOUNMAP. | |
cb365b96 CH |
329 | * |
330 | * If %flags contains BLKDEV_ZERO_NOFALLBACK, the function will return | |
331 | * -EOPNOTSUPP if no explicit hardware offload for zeroing is provided. | |
3f14d792 | 332 | */ |
e73c23ff CK |
333 | int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
334 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, | |
ee472d83 | 335 | unsigned flags) |
3f14d792 | 336 | { |
18edc8ea | 337 | int ret; |
28b2be20 DW |
338 | sector_t bs_mask; |
339 | ||
340 | bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; | |
341 | if ((sector | nr_sects) & bs_mask) | |
342 | return -EINVAL; | |
3f14d792 | 343 | |
a6f0788e | 344 | ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, gfp_mask, |
d928be9f | 345 | biop, flags); |
cb365b96 | 346 | if (ret != -EOPNOTSUPP || (flags & BLKDEV_ZERO_NOFALLBACK)) |
425a4dba | 347 | return ret; |
3f14d792 | 348 | |
425a4dba ID |
349 | return __blkdev_issue_zero_pages(bdev, sector, nr_sects, gfp_mask, |
350 | biop); | |
3f14d792 | 351 | } |
e73c23ff | 352 | EXPORT_SYMBOL(__blkdev_issue_zeroout); |
579e8f3c MP |
353 | |
354 | /** | |
355 | * blkdev_issue_zeroout - zero-fill a block range | |
356 | * @bdev: blockdev to write | |
357 | * @sector: start sector | |
358 | * @nr_sects: number of sectors to write | |
359 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
ee472d83 | 360 | * @flags: controls detailed behavior |
579e8f3c MP |
361 | * |
362 | * Description: | |
ee472d83 CH |
363 | * Zero-fill a block range, either using hardware offload or by explicitly |
364 | * writing zeroes to the device. See __blkdev_issue_zeroout() for the | |
365 | * valid values for %flags. | |
579e8f3c | 366 | */ |
579e8f3c | 367 | int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
ee472d83 | 368 | sector_t nr_sects, gfp_t gfp_mask, unsigned flags) |
579e8f3c | 369 | { |
d5ce4c31 ID |
370 | int ret = 0; |
371 | sector_t bs_mask; | |
372 | struct bio *bio; | |
e73c23ff | 373 | struct blk_plug plug; |
d5ce4c31 | 374 | bool try_write_zeroes = !!bdev_write_zeroes_sectors(bdev); |
d93ba7a5 | 375 | |
d5ce4c31 ID |
376 | bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; |
377 | if ((sector | nr_sects) & bs_mask) | |
378 | return -EINVAL; | |
379 | ||
380 | retry: | |
381 | bio = NULL; | |
e73c23ff | 382 | blk_start_plug(&plug); |
d5ce4c31 ID |
383 | if (try_write_zeroes) { |
384 | ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, | |
385 | gfp_mask, &bio, flags); | |
386 | } else if (!(flags & BLKDEV_ZERO_NOFALLBACK)) { | |
387 | ret = __blkdev_issue_zero_pages(bdev, sector, nr_sects, | |
388 | gfp_mask, &bio); | |
389 | } else { | |
390 | /* No zeroing offload support */ | |
391 | ret = -EOPNOTSUPP; | |
392 | } | |
e73c23ff CK |
393 | if (ret == 0 && bio) { |
394 | ret = submit_bio_wait(bio); | |
395 | bio_put(bio); | |
396 | } | |
397 | blk_finish_plug(&plug); | |
d5ce4c31 ID |
398 | if (ret && try_write_zeroes) { |
399 | if (!(flags & BLKDEV_ZERO_NOFALLBACK)) { | |
400 | try_write_zeroes = false; | |
401 | goto retry; | |
402 | } | |
403 | if (!bdev_write_zeroes_sectors(bdev)) { | |
404 | /* | |
405 | * Zeroing offload support was indicated, but the | |
406 | * device reported ILLEGAL REQUEST (for some devices | |
407 | * there is no non-destructive way to verify whether | |
408 | * WRITE ZEROES is actually supported). | |
409 | */ | |
410 | ret = -EOPNOTSUPP; | |
411 | } | |
412 | } | |
579e8f3c | 413 | |
e73c23ff | 414 | return ret; |
579e8f3c | 415 | } |
3f14d792 | 416 | EXPORT_SYMBOL(blkdev_issue_zeroout); |