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 | ||
e3cc28ea CH |
13 | static sector_t bio_discard_limit(struct block_device *bdev, sector_t sector) |
14 | { | |
7b47ef52 | 15 | unsigned int discard_granularity = bdev_discard_granularity(bdev); |
e3cc28ea CH |
16 | sector_t granularity_aligned_sector; |
17 | ||
18 | if (bdev_is_partition(bdev)) | |
19 | sector += bdev->bd_start_sect; | |
20 | ||
21 | granularity_aligned_sector = | |
22 | round_up(sector, discard_granularity >> SECTOR_SHIFT); | |
23 | ||
24 | /* | |
25 | * Make sure subsequent bios start aligned to the discard granularity if | |
26 | * it needs to be split. | |
27 | */ | |
28 | if (granularity_aligned_sector != sector) | |
29 | return granularity_aligned_sector - sector; | |
30 | ||
31 | /* | |
32 | * Align the bio size to the discard granularity to make splitting the bio | |
33 | * at discard granularity boundaries easier in the driver if needed. | |
34 | */ | |
35 | return round_down(UINT_MAX, discard_granularity) >> SECTOR_SHIFT; | |
36 | } | |
37 | ||
38f25255 | 38 | int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
44abff2c | 39 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop) |
f31e7e40 | 40 | { |
38f25255 | 41 | struct bio *bio = *biop; |
e3cc28ea | 42 | sector_t bs_mask; |
f31e7e40 | 43 | |
a13553c7 ID |
44 | if (bdev_read_only(bdev)) |
45 | return -EPERM; | |
44abff2c CH |
46 | if (!bdev_max_discard_sectors(bdev)) |
47 | return -EOPNOTSUPP; | |
f31e7e40 | 48 | |
b35fd742 | 49 | /* In case the discard granularity isn't set by buggy device driver */ |
7b47ef52 | 50 | if (WARN_ON_ONCE(!bdev_discard_granularity(bdev))) { |
02ff3dd2 CH |
51 | pr_err_ratelimited("%pg: Error: discard_granularity is 0.\n", |
52 | bdev); | |
b35fd742 CL |
53 | return -EOPNOTSUPP; |
54 | } | |
55 | ||
28b2be20 DW |
56 | bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; |
57 | if ((sector | nr_sects) & bs_mask) | |
58 | return -EINVAL; | |
59 | ||
ba5d7385 ML |
60 | if (!nr_sects) |
61 | return -EINVAL; | |
a22c4d7e | 62 | |
ba5d7385 | 63 | while (nr_sects) { |
e3cc28ea CH |
64 | sector_t req_sects = |
65 | min(nr_sects, bio_discard_limit(bdev, sector)); | |
4800bf7b | 66 | |
44abff2c | 67 | bio = blk_next_bio(bio, bdev, 0, REQ_OP_DISCARD, gfp_mask); |
4f024f37 | 68 | bio->bi_iter.bi_sector = sector; |
4f024f37 | 69 | bio->bi_iter.bi_size = req_sects << 9; |
ba5d7385 | 70 | sector += req_sects; |
c6e66634 | 71 | nr_sects -= req_sects; |
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; | |
84 | } | |
85 | EXPORT_SYMBOL(__blkdev_issue_discard); | |
86 | ||
87 | /** | |
88 | * blkdev_issue_discard - queue a discard | |
89 | * @bdev: blockdev to issue discard for | |
90 | * @sector: start sector | |
91 | * @nr_sects: number of sectors to discard | |
92 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
38f25255 CH |
93 | * |
94 | * Description: | |
95 | * Issue a discard request for the sectors in question. | |
96 | */ | |
97 | int blkdev_issue_discard(struct block_device *bdev, sector_t sector, | |
44abff2c | 98 | sector_t nr_sects, gfp_t gfp_mask) |
38f25255 | 99 | { |
38f25255 CH |
100 | struct bio *bio = NULL; |
101 | struct blk_plug plug; | |
102 | int ret; | |
103 | ||
38f25255 | 104 | blk_start_plug(&plug); |
44abff2c | 105 | ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, &bio); |
bbd848e0 | 106 | if (!ret && bio) { |
4e49ea4a | 107 | ret = submit_bio_wait(bio); |
48920ff2 | 108 | if (ret == -EOPNOTSUPP) |
bbd848e0 | 109 | ret = 0; |
05bd92dd | 110 | bio_put(bio); |
bbd848e0 | 111 | } |
0cfbcafc | 112 | blk_finish_plug(&plug); |
f31e7e40 | 113 | |
bbd848e0 | 114 | return ret; |
f31e7e40 DM |
115 | } |
116 | EXPORT_SYMBOL(blkdev_issue_discard); | |
3f14d792 | 117 | |
a6f0788e CK |
118 | static int __blkdev_issue_write_zeroes(struct block_device *bdev, |
119 | sector_t sector, sector_t nr_sects, gfp_t gfp_mask, | |
d928be9f | 120 | struct bio **biop, unsigned flags) |
a6f0788e CK |
121 | { |
122 | struct bio *bio = *biop; | |
76a27e1b | 123 | unsigned int max_sectors; |
a6f0788e | 124 | |
a13553c7 ID |
125 | if (bdev_read_only(bdev)) |
126 | return -EPERM; | |
127 | ||
76a27e1b KB |
128 | /* Ensure that max_sectors doesn't overflow bi_size */ |
129 | max_sectors = bdev_write_zeroes_sectors(bdev); | |
a6f0788e | 130 | |
76a27e1b | 131 | if (max_sectors == 0) |
a6f0788e CK |
132 | return -EOPNOTSUPP; |
133 | ||
134 | while (nr_sects) { | |
76a27e1b KB |
135 | unsigned int len = min_t(sector_t, nr_sects, max_sectors); |
136 | ||
0a3140ea | 137 | bio = blk_next_bio(bio, bdev, 0, REQ_OP_WRITE_ZEROES, gfp_mask); |
a6f0788e | 138 | bio->bi_iter.bi_sector = sector; |
d928be9f CH |
139 | if (flags & BLKDEV_ZERO_NOUNMAP) |
140 | bio->bi_opf |= REQ_NOUNMAP; | |
a6f0788e | 141 | |
76a27e1b KB |
142 | bio->bi_iter.bi_size = len << SECTOR_SHIFT; |
143 | nr_sects -= len; | |
144 | sector += len; | |
a6f0788e CK |
145 | cond_resched(); |
146 | } | |
147 | ||
148 | *biop = bio; | |
149 | return 0; | |
150 | } | |
151 | ||
615d22a5 DLM |
152 | /* |
153 | * Convert a number of 512B sectors to a number of pages. | |
154 | * The result is limited to a number of pages that can fit into a BIO. | |
155 | * Also make sure that the result is always at least 1 (page) for the cases | |
156 | * where nr_sects is lower than the number of sectors in a page. | |
157 | */ | |
158 | static unsigned int __blkdev_sectors_to_bio_pages(sector_t nr_sects) | |
159 | { | |
09c2c359 | 160 | sector_t pages = DIV_ROUND_UP_SECTOR_T(nr_sects, PAGE_SIZE / 512); |
615d22a5 | 161 | |
a8affc03 | 162 | return min(pages, (sector_t)BIO_MAX_VECS); |
615d22a5 DLM |
163 | } |
164 | ||
425a4dba ID |
165 | static int __blkdev_issue_zero_pages(struct block_device *bdev, |
166 | sector_t sector, sector_t nr_sects, gfp_t gfp_mask, | |
167 | struct bio **biop) | |
168 | { | |
425a4dba ID |
169 | struct bio *bio = *biop; |
170 | int bi_size = 0; | |
171 | unsigned int sz; | |
172 | ||
a13553c7 ID |
173 | if (bdev_read_only(bdev)) |
174 | return -EPERM; | |
175 | ||
425a4dba | 176 | while (nr_sects != 0) { |
0a3140ea CK |
177 | bio = blk_next_bio(bio, bdev, __blkdev_sectors_to_bio_pages(nr_sects), |
178 | REQ_OP_WRITE, gfp_mask); | |
425a4dba | 179 | bio->bi_iter.bi_sector = sector; |
425a4dba ID |
180 | |
181 | while (nr_sects != 0) { | |
182 | sz = min((sector_t) PAGE_SIZE, nr_sects << 9); | |
183 | bi_size = bio_add_page(bio, ZERO_PAGE(0), sz, 0); | |
184 | nr_sects -= bi_size >> 9; | |
185 | sector += bi_size >> 9; | |
186 | if (bi_size < sz) | |
187 | break; | |
188 | } | |
189 | cond_resched(); | |
190 | } | |
191 | ||
192 | *biop = bio; | |
193 | return 0; | |
194 | } | |
195 | ||
3f14d792 | 196 | /** |
e73c23ff | 197 | * __blkdev_issue_zeroout - generate number of zero filed write bios |
3f14d792 DM |
198 | * @bdev: blockdev to issue |
199 | * @sector: start sector | |
200 | * @nr_sects: number of sectors to write | |
201 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
e73c23ff | 202 | * @biop: pointer to anchor bio |
ee472d83 | 203 | * @flags: controls detailed behavior |
3f14d792 DM |
204 | * |
205 | * Description: | |
ee472d83 CH |
206 | * Zero-fill a block range, either using hardware offload or by explicitly |
207 | * writing zeroes to the device. | |
208 | * | |
209 | * If a device is using logical block provisioning, the underlying space will | |
210 | * not be released if %flags contains BLKDEV_ZERO_NOUNMAP. | |
cb365b96 CH |
211 | * |
212 | * If %flags contains BLKDEV_ZERO_NOFALLBACK, the function will return | |
213 | * -EOPNOTSUPP if no explicit hardware offload for zeroing is provided. | |
3f14d792 | 214 | */ |
e73c23ff CK |
215 | int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
216 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, | |
ee472d83 | 217 | unsigned flags) |
3f14d792 | 218 | { |
18edc8ea | 219 | int ret; |
28b2be20 DW |
220 | sector_t bs_mask; |
221 | ||
222 | bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; | |
223 | if ((sector | nr_sects) & bs_mask) | |
224 | return -EINVAL; | |
3f14d792 | 225 | |
a6f0788e | 226 | ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, gfp_mask, |
d928be9f | 227 | biop, flags); |
cb365b96 | 228 | if (ret != -EOPNOTSUPP || (flags & BLKDEV_ZERO_NOFALLBACK)) |
425a4dba | 229 | return ret; |
3f14d792 | 230 | |
425a4dba ID |
231 | return __blkdev_issue_zero_pages(bdev, sector, nr_sects, gfp_mask, |
232 | biop); | |
3f14d792 | 233 | } |
e73c23ff | 234 | EXPORT_SYMBOL(__blkdev_issue_zeroout); |
579e8f3c MP |
235 | |
236 | /** | |
237 | * blkdev_issue_zeroout - zero-fill a block range | |
238 | * @bdev: blockdev to write | |
239 | * @sector: start sector | |
240 | * @nr_sects: number of sectors to write | |
241 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
ee472d83 | 242 | * @flags: controls detailed behavior |
579e8f3c MP |
243 | * |
244 | * Description: | |
ee472d83 CH |
245 | * Zero-fill a block range, either using hardware offload or by explicitly |
246 | * writing zeroes to the device. See __blkdev_issue_zeroout() for the | |
247 | * valid values for %flags. | |
579e8f3c | 248 | */ |
579e8f3c | 249 | int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
ee472d83 | 250 | sector_t nr_sects, gfp_t gfp_mask, unsigned flags) |
579e8f3c | 251 | { |
d5ce4c31 ID |
252 | int ret = 0; |
253 | sector_t bs_mask; | |
254 | struct bio *bio; | |
e73c23ff | 255 | struct blk_plug plug; |
d5ce4c31 | 256 | bool try_write_zeroes = !!bdev_write_zeroes_sectors(bdev); |
d93ba7a5 | 257 | |
d5ce4c31 ID |
258 | bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; |
259 | if ((sector | nr_sects) & bs_mask) | |
260 | return -EINVAL; | |
261 | ||
262 | retry: | |
263 | bio = NULL; | |
e73c23ff | 264 | blk_start_plug(&plug); |
d5ce4c31 ID |
265 | if (try_write_zeroes) { |
266 | ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, | |
267 | gfp_mask, &bio, flags); | |
268 | } else if (!(flags & BLKDEV_ZERO_NOFALLBACK)) { | |
269 | ret = __blkdev_issue_zero_pages(bdev, sector, nr_sects, | |
270 | gfp_mask, &bio); | |
271 | } else { | |
272 | /* No zeroing offload support */ | |
273 | ret = -EOPNOTSUPP; | |
274 | } | |
e73c23ff CK |
275 | if (ret == 0 && bio) { |
276 | ret = submit_bio_wait(bio); | |
277 | bio_put(bio); | |
278 | } | |
279 | blk_finish_plug(&plug); | |
bf5e3a30 | 280 | if (ret && try_write_zeroes) { |
d5ce4c31 ID |
281 | if (!(flags & BLKDEV_ZERO_NOFALLBACK)) { |
282 | try_write_zeroes = false; | |
283 | goto retry; | |
284 | } | |
285 | if (!bdev_write_zeroes_sectors(bdev)) { | |
286 | /* | |
287 | * Zeroing offload support was indicated, but the | |
288 | * device reported ILLEGAL REQUEST (for some devices | |
289 | * there is no non-destructive way to verify whether | |
290 | * WRITE ZEROES is actually supported). | |
291 | */ | |
292 | ret = -EOPNOTSUPP; | |
293 | } | |
294 | } | |
579e8f3c | 295 | |
e73c23ff | 296 | return ret; |
579e8f3c | 297 | } |
3f14d792 | 298 | EXPORT_SYMBOL(blkdev_issue_zeroout); |
44abff2c CH |
299 | |
300 | int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, | |
301 | sector_t nr_sects, gfp_t gfp) | |
302 | { | |
303 | sector_t bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; | |
304 | unsigned int max_sectors = bdev_max_secure_erase_sectors(bdev); | |
305 | struct bio *bio = NULL; | |
306 | struct blk_plug plug; | |
307 | int ret = 0; | |
308 | ||
c4fa3684 MP |
309 | /* make sure that "len << SECTOR_SHIFT" doesn't overflow */ |
310 | if (max_sectors > UINT_MAX >> SECTOR_SHIFT) | |
311 | max_sectors = UINT_MAX >> SECTOR_SHIFT; | |
312 | max_sectors &= ~bs_mask; | |
313 | ||
44abff2c CH |
314 | if (max_sectors == 0) |
315 | return -EOPNOTSUPP; | |
316 | if ((sector | nr_sects) & bs_mask) | |
317 | return -EINVAL; | |
318 | if (bdev_read_only(bdev)) | |
319 | return -EPERM; | |
320 | ||
321 | blk_start_plug(&plug); | |
5affe497 | 322 | while (nr_sects) { |
44abff2c CH |
323 | unsigned int len = min_t(sector_t, nr_sects, max_sectors); |
324 | ||
325 | bio = blk_next_bio(bio, bdev, 0, REQ_OP_SECURE_ERASE, gfp); | |
326 | bio->bi_iter.bi_sector = sector; | |
c4fa3684 | 327 | bio->bi_iter.bi_size = len << SECTOR_SHIFT; |
44abff2c | 328 | |
c4fa3684 MP |
329 | sector += len; |
330 | nr_sects -= len; | |
44abff2c CH |
331 | cond_resched(); |
332 | } | |
5affe497 KB |
333 | if (bio) { |
334 | ret = submit_bio_wait(bio); | |
335 | bio_put(bio); | |
336 | } | |
44abff2c CH |
337 | blk_finish_plug(&plug); |
338 | ||
339 | return ret; | |
340 | } | |
341 | EXPORT_SYMBOL(blkdev_issue_secure_erase); |