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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Dmitry Monakhovf31e7e42010-04-28 17:55:08 +04002/*
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
Christoph Hellwige3cc28e2022-04-15 06:52:53 +020013static sector_t bio_discard_limit(struct block_device *bdev, sector_t sector)
14{
Christoph Hellwig7b47ef52022-04-15 06:52:56 +020015 unsigned int discard_granularity = bdev_discard_granularity(bdev);
Christoph Hellwige3cc28e2022-04-15 06:52:53 +020016 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
Christoph Hellwig38f25252016-04-16 14:55:28 -040038int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
Christoph Hellwig44abff2c2022-04-15 06:52:57 +020039 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop)
Dmitry Monakhovf31e7e42010-04-28 17:55:08 +040040{
Christoph Hellwig38f25252016-04-16 14:55:28 -040041 struct bio *bio = *biop;
Christoph Hellwige3cc28e2022-04-15 06:52:53 +020042 sector_t bs_mask;
Dmitry Monakhovf31e7e42010-04-28 17:55:08 +040043
Ilya Dryomova13553c2018-01-11 14:09:12 +010044 if (bdev_read_only(bdev))
45 return -EPERM;
Christoph Hellwig44abff2c2022-04-15 06:52:57 +020046 if (!bdev_max_discard_sectors(bdev))
47 return -EOPNOTSUPP;
Dmitry Monakhovf31e7e42010-04-28 17:55:08 +040048
Coly Lib35fd742020-08-06 01:25:03 +080049 /* In case the discard granularity isn't set by buggy device driver */
Christoph Hellwig7b47ef52022-04-15 06:52:56 +020050 if (WARN_ON_ONCE(!bdev_discard_granularity(bdev))) {
Christoph Hellwig02ff3dd2022-07-13 07:53:10 +020051 pr_err_ratelimited("%pg: Error: discard_granularity is 0.\n",
52 bdev);
Coly Lib35fd742020-08-06 01:25:03 +080053 return -EOPNOTSUPP;
54 }
55
Darrick J. Wong28b2be22016-10-11 13:51:08 -070056 bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
57 if ((sector | nr_sects) & bs_mask)
58 return -EINVAL;
59
Ming Leiba5d7382018-10-29 20:57:18 +080060 if (!nr_sects)
61 return -EINVAL;
62
Lukas Czerner5dba3082011-05-06 19:26:27 -060063 while (nr_sects) {
Christoph Hellwige3cc28e2022-04-15 06:52:53 +020064 sector_t req_sects =
65 min(nr_sects, bio_discard_limit(bdev, sector));
Dave Chinner4800bf72018-11-14 08:17:18 -070066
Christoph Hellwig44abff2c2022-04-15 06:52:57 +020067 bio = blk_next_bio(bio, bdev, 0, REQ_OP_DISCARD, gfp_mask);
Kent Overstreet4f024f32013-10-11 15:44:27 -070068 bio->bi_iter.bi_sector = sector;
Kent Overstreet4f024f32013-10-11 15:44:27 -070069 bio->bi_iter.bi_size = req_sects << 9;
Ming Leiba5d7382018-10-29 20:57:18 +080070 sector += req_sects;
Paolo Bonzinic6e66632012-08-02 09:48:50 +020071 nr_sects -= req_sects;
Dmitry Monakhovf31e7e42010-04-28 17:55:08 +040072
Jens Axboec8123f82014-02-12 09:34:01 -070073 /*
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();
Lukas Czerner5dba3082011-05-06 19:26:27 -060080 }
Christoph Hellwig38f25252016-04-16 14:55:28 -040081
82 *biop = bio;
83 return 0;
84}
85EXPORT_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)
Christoph Hellwig38f25252016-04-16 14:55:28 -040093 *
94 * Description:
95 * Issue a discard request for the sectors in question.
96 */
97int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
Christoph Hellwig44abff2c2022-04-15 06:52:57 +020098 sector_t nr_sects, gfp_t gfp_mask)
Christoph Hellwig38f25252016-04-16 14:55:28 -040099{
Christoph Hellwig38f25252016-04-16 14:55:28 -0400100 struct bio *bio = NULL;
101 struct blk_plug plug;
102 int ret;
103
Christoph Hellwig38f25252016-04-16 14:55:28 -0400104 blk_start_plug(&plug);
Christoph Hellwig44abff2c2022-04-15 06:52:57 +0200105 ret = __blkdev_issue_discard(bdev, sector, nr_sects, gfp_mask, &bio);
Mike Snitzerbbd848e0f2016-05-05 11:54:21 -0400106 if (!ret && bio) {
Mike Christie4e49ea42016-06-05 14:31:41 -0500107 ret = submit_bio_wait(bio);
Christoph Hellwig48920ff2017-04-05 19:21:23 +0200108 if (ret == -EOPNOTSUPP)
Mike Snitzerbbd848e0f2016-05-05 11:54:21 -0400109 ret = 0;
Shaun Tancheff05bd92d2016-06-07 11:32:13 -0500110 bio_put(bio);
Mike Snitzerbbd848e0f2016-05-05 11:54:21 -0400111 }
Shaohua Li0cfbcaf2012-12-14 11:15:51 +0800112 blk_finish_plug(&plug);
Dmitry Monakhovf31e7e42010-04-28 17:55:08 +0400113
Mike Snitzerbbd848e0f2016-05-05 11:54:21 -0400114 return ret;
Dmitry Monakhovf31e7e42010-04-28 17:55:08 +0400115}
116EXPORT_SYMBOL(blkdev_issue_discard);
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400117
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800118static int __blkdev_issue_write_zeroes(struct block_device *bdev,
119 sector_t sector, sector_t nr_sects, gfp_t gfp_mask,
Christoph Hellwigd928be92017-04-05 19:21:09 +0200120 struct bio **biop, unsigned flags)
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800121{
122 struct bio *bio = *biop;
123 unsigned int max_write_zeroes_sectors;
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800124
Ilya Dryomova13553c2018-01-11 14:09:12 +0100125 if (bdev_read_only(bdev))
126 return -EPERM;
127
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800128 /* Ensure that max_write_zeroes_sectors doesn't overflow bi_size */
129 max_write_zeroes_sectors = bdev_write_zeroes_sectors(bdev);
130
131 if (max_write_zeroes_sectors == 0)
132 return -EOPNOTSUPP;
133
134 while (nr_sects) {
Chaitanya Kulkarni0a3140e2022-01-24 10:11:02 +0100135 bio = blk_next_bio(bio, bdev, 0, REQ_OP_WRITE_ZEROES, gfp_mask);
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800136 bio->bi_iter.bi_sector = sector;
Christoph Hellwigd928be92017-04-05 19:21:09 +0200137 if (flags & BLKDEV_ZERO_NOUNMAP)
138 bio->bi_opf |= REQ_NOUNMAP;
Chaitanya Kulkarnia6f07882016-11-30 12:28:59 -0800139
140 if (nr_sects > max_write_zeroes_sectors) {
141 bio->bi_iter.bi_size = max_write_zeroes_sectors << 9;
142 nr_sects -= max_write_zeroes_sectors;
143 sector += max_write_zeroes_sectors;
144 } else {
145 bio->bi_iter.bi_size = nr_sects << 9;
146 nr_sects = 0;
147 }
148 cond_resched();
149 }
150
151 *biop = bio;
152 return 0;
153}
154
Damien Le Moal615d22a2017-07-06 20:21:15 +0900155/*
156 * Convert a number of 512B sectors to a number of pages.
157 * The result is limited to a number of pages that can fit into a BIO.
158 * Also make sure that the result is always at least 1 (page) for the cases
159 * where nr_sects is lower than the number of sectors in a page.
160 */
161static unsigned int __blkdev_sectors_to_bio_pages(sector_t nr_sects)
162{
Mikulas Patocka09c2c352017-09-11 09:46:49 -0600163 sector_t pages = DIV_ROUND_UP_SECTOR_T(nr_sects, PAGE_SIZE / 512);
Damien Le Moal615d22a2017-07-06 20:21:15 +0900164
Christoph Hellwiga8affc02021-03-11 12:01:37 +0100165 return min(pages, (sector_t)BIO_MAX_VECS);
Damien Le Moal615d22a2017-07-06 20:21:15 +0900166}
167
Ilya Dryomov425a4db2017-10-16 15:59:09 +0200168static int __blkdev_issue_zero_pages(struct block_device *bdev,
169 sector_t sector, sector_t nr_sects, gfp_t gfp_mask,
170 struct bio **biop)
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400171{
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800172 struct bio *bio = *biop;
Ilya Dryomov425a4db2017-10-16 15:59:09 +0200173 int bi_size = 0;
Lukas Czerner0aeea182011-03-11 10:23:53 +0100174 unsigned int sz;
Darrick J. Wong28b2be22016-10-11 13:51:08 -0700175
Ilya Dryomova13553c2018-01-11 14:09:12 +0100176 if (bdev_read_only(bdev))
177 return -EPERM;
178
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400179 while (nr_sects != 0) {
Chaitanya Kulkarni0a3140e2022-01-24 10:11:02 +0100180 bio = blk_next_bio(bio, bdev, __blkdev_sectors_to_bio_pages(nr_sects),
181 REQ_OP_WRITE, gfp_mask);
Kent Overstreet4f024f32013-10-11 15:44:27 -0700182 bio->bi_iter.bi_sector = sector;
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400183
Jens Axboe0341aaf2010-04-29 09:28:21 +0200184 while (nr_sects != 0) {
Damien Le Moal615d22a2017-07-06 20:21:15 +0900185 sz = min((sector_t) PAGE_SIZE, nr_sects << 9);
186 bi_size = bio_add_page(bio, ZERO_PAGE(0), sz, 0);
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800187 nr_sects -= bi_size >> 9;
188 sector += bi_size >> 9;
Damien Le Moal615d22a2017-07-06 20:21:15 +0900189 if (bi_size < sz)
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400190 break;
191 }
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800192 cond_resched();
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400193 }
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400194
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800195 *biop = bio;
Ilya Dryomov425a4db2017-10-16 15:59:09 +0200196 return 0;
197}
198
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400199/**
200 * __blkdev_issue_zeroout - generate number of zero filed write bios
201 * @bdev: blockdev to issue
202 * @sector: start sector
203 * @nr_sects: number of sectors to write
204 * @gfp_mask: memory allocation flags (for bio_alloc)
205 * @biop: pointer to anchor bio
206 * @flags: controls detailed behavior
207 *
208 * Description:
209 * Zero-fill a block range, either using hardware offload or by explicitly
210 * writing zeroes to the device.
211 *
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400212 * If a device is using logical block provisioning, the underlying space will
213 * not be released if %flags contains BLKDEV_ZERO_NOUNMAP.
214 *
215 * If %flags contains BLKDEV_ZERO_NOFALLBACK, the function will return
216 * -EOPNOTSUPP if no explicit hardware offload for zeroing is provided.
217 */
218int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
219 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
220 unsigned flags)
221{
222 int ret;
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400223 sector_t bs_mask;
224
225 bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
226 if ((sector | nr_sects) & bs_mask)
227 return -EINVAL;
228
229 ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, gfp_mask,
230 biop, flags);
231 if (ret != -EOPNOTSUPP || (flags & BLKDEV_ZERO_NOFALLBACK))
Ilya Dryomov425a4db2017-10-16 15:59:09 +0200232 return ret;
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400233
Ilya Dryomov425a4db2017-10-16 15:59:09 +0200234 return __blkdev_issue_zero_pages(bdev, sector, nr_sects, gfp_mask,
235 biop);
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400236}
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800237EXPORT_SYMBOL(__blkdev_issue_zeroout);
Martin K. Petersen579e8f32012-09-18 12:19:28 -0400238
239/**
240 * blkdev_issue_zeroout - zero-fill a block range
241 * @bdev: blockdev to write
242 * @sector: start sector
243 * @nr_sects: number of sectors to write
244 * @gfp_mask: memory allocation flags (for bio_alloc)
Christoph Hellwigee472d82017-04-05 19:21:08 +0200245 * @flags: controls detailed behavior
Martin K. Petersen579e8f32012-09-18 12:19:28 -0400246 *
247 * Description:
Christoph Hellwigee472d82017-04-05 19:21:08 +0200248 * Zero-fill a block range, either using hardware offload or by explicitly
249 * writing zeroes to the device. See __blkdev_issue_zeroout() for the
250 * valid values for %flags.
Martin K. Petersen579e8f32012-09-18 12:19:28 -0400251 */
Martin K. Petersen579e8f32012-09-18 12:19:28 -0400252int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
Christoph Hellwigee472d82017-04-05 19:21:08 +0200253 sector_t nr_sects, gfp_t gfp_mask, unsigned flags)
Martin K. Petersen579e8f32012-09-18 12:19:28 -0400254{
Ilya Dryomovd5ce4c32017-10-16 15:59:10 +0200255 int ret = 0;
256 sector_t bs_mask;
257 struct bio *bio;
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800258 struct blk_plug plug;
Ilya Dryomovd5ce4c32017-10-16 15:59:10 +0200259 bool try_write_zeroes = !!bdev_write_zeroes_sectors(bdev);
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800260
Ilya Dryomovd5ce4c32017-10-16 15:59:10 +0200261 bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
262 if ((sector | nr_sects) & bs_mask)
263 return -EINVAL;
264
265retry:
266 bio = NULL;
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800267 blk_start_plug(&plug);
Ilya Dryomovd5ce4c32017-10-16 15:59:10 +0200268 if (try_write_zeroes) {
269 ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects,
270 gfp_mask, &bio, flags);
271 } else if (!(flags & BLKDEV_ZERO_NOFALLBACK)) {
272 ret = __blkdev_issue_zero_pages(bdev, sector, nr_sects,
273 gfp_mask, &bio);
274 } else {
275 /* No zeroing offload support */
276 ret = -EOPNOTSUPP;
277 }
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800278 if (ret == 0 && bio) {
279 ret = submit_bio_wait(bio);
280 bio_put(bio);
Christoph Hellwige950fdf2016-07-19 11:23:33 +0200281 }
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800282 blk_finish_plug(&plug);
Ilya Dryomovd5ce4c32017-10-16 15:59:10 +0200283 if (ret && try_write_zeroes) {
284 if (!(flags & BLKDEV_ZERO_NOFALLBACK)) {
285 try_write_zeroes = false;
286 goto retry;
287 }
288 if (!bdev_write_zeroes_sectors(bdev)) {
289 /*
290 * Zeroing offload support was indicated, but the
291 * device reported ILLEGAL REQUEST (for some devices
292 * there is no non-destructive way to verify whether
293 * WRITE ZEROES is actually supported).
294 */
295 ret = -EOPNOTSUPP;
296 }
297 }
Martin K. Petersend93ba7a2015-01-20 20:06:30 -0500298
Chaitanya Kulkarnie73c23f2016-11-30 12:28:58 -0800299 return ret;
Martin K. Petersen579e8f32012-09-18 12:19:28 -0400300}
Dmitry Monakhov3f14d792010-04-28 17:55:09 +0400301EXPORT_SYMBOL(blkdev_issue_zeroout);
Christoph Hellwig44abff2c2022-04-15 06:52:57 +0200302
303int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,
304 sector_t nr_sects, gfp_t gfp)
305{
306 sector_t bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
307 unsigned int max_sectors = bdev_max_secure_erase_sectors(bdev);
308 struct bio *bio = NULL;
309 struct blk_plug plug;
310 int ret = 0;
311
Mikulas Patockac4fa3682022-09-14 16:55:51 -0400312 /* make sure that "len << SECTOR_SHIFT" doesn't overflow */
313 if (max_sectors > UINT_MAX >> SECTOR_SHIFT)
314 max_sectors = UINT_MAX >> SECTOR_SHIFT;
315 max_sectors &= ~bs_mask;
316
Christoph Hellwig44abff2c2022-04-15 06:52:57 +0200317 if (max_sectors == 0)
318 return -EOPNOTSUPP;
319 if ((sector | nr_sects) & bs_mask)
320 return -EINVAL;
321 if (bdev_read_only(bdev))
322 return -EPERM;
323
324 blk_start_plug(&plug);
325 for (;;) {
326 unsigned int len = min_t(sector_t, nr_sects, max_sectors);
327
328 bio = blk_next_bio(bio, bdev, 0, REQ_OP_SECURE_ERASE, gfp);
329 bio->bi_iter.bi_sector = sector;
Mikulas Patockac4fa3682022-09-14 16:55:51 -0400330 bio->bi_iter.bi_size = len << SECTOR_SHIFT;
Christoph Hellwig44abff2c2022-04-15 06:52:57 +0200331
Mikulas Patockac4fa3682022-09-14 16:55:51 -0400332 sector += len;
333 nr_sects -= len;
Christoph Hellwig44abff2c2022-04-15 06:52:57 +0200334 if (!nr_sects) {
335 ret = submit_bio_wait(bio);
336 bio_put(bio);
337 break;
338 }
339 cond_resched();
340 }
341 blk_finish_plug(&plug);
342
343 return ret;
344}
345EXPORT_SYMBOL(blkdev_issue_secure_erase);