Commit | Line | Data |
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f31e7e40 DM |
1 | /* |
2 | * Functions related to generic helpers functions | |
3 | */ | |
4 | #include <linux/kernel.h> | |
5 | #include <linux/module.h> | |
6 | #include <linux/bio.h> | |
7 | #include <linux/blkdev.h> | |
8 | #include <linux/scatterlist.h> | |
9 | ||
10 | #include "blk.h" | |
11 | ||
5dba3089 LC |
12 | struct bio_batch { |
13 | atomic_t done; | |
14 | unsigned long flags; | |
15 | struct completion *wait; | |
16 | }; | |
17 | ||
18 | static void bio_batch_end_io(struct bio *bio, int err) | |
f31e7e40 | 19 | { |
5dba3089 LC |
20 | struct bio_batch *bb = bio->bi_private; |
21 | ||
8af1954d | 22 | if (err && (err != -EOPNOTSUPP)) |
5dba3089 | 23 | clear_bit(BIO_UPTODATE, &bb->flags); |
5dba3089 LC |
24 | if (atomic_dec_and_test(&bb->done)) |
25 | complete(bb->wait); | |
f31e7e40 DM |
26 | bio_put(bio); |
27 | } | |
28 | ||
29 | /** | |
30 | * blkdev_issue_discard - queue a discard | |
31 | * @bdev: blockdev to issue discard for | |
32 | * @sector: start sector | |
33 | * @nr_sects: number of sectors to discard | |
34 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
35 | * @flags: BLKDEV_IFL_* flags to control behaviour | |
36 | * | |
37 | * Description: | |
38 | * Issue a discard request for the sectors in question. | |
39 | */ | |
40 | int blkdev_issue_discard(struct block_device *bdev, sector_t sector, | |
41 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags) | |
42 | { | |
43 | DECLARE_COMPLETION_ONSTACK(wait); | |
44 | struct request_queue *q = bdev_get_queue(bdev); | |
8c555367 | 45 | int type = REQ_WRITE | REQ_DISCARD; |
8dd2cb7e SL |
46 | sector_t max_discard_sectors; |
47 | sector_t granularity, alignment; | |
5dba3089 | 48 | struct bio_batch bb; |
f31e7e40 | 49 | struct bio *bio; |
f31e7e40 DM |
50 | int ret = 0; |
51 | ||
52 | if (!q) | |
53 | return -ENXIO; | |
54 | ||
55 | if (!blk_queue_discard(q)) | |
56 | return -EOPNOTSUPP; | |
57 | ||
f6ff53d3 PB |
58 | /* Zero-sector (unknown) and one-sector granularities are the same. */ |
59 | granularity = max(q->limits.discard_granularity >> 9, 1U); | |
8dd2cb7e SL |
60 | alignment = bdev_discard_alignment(bdev) >> 9; |
61 | alignment = sector_div(alignment, granularity); | |
f6ff53d3 | 62 | |
10d1f9e2 JA |
63 | /* |
64 | * Ensure that max_discard_sectors is of the proper | |
c6e66634 | 65 | * granularity, so that requests stay aligned after a split. |
10d1f9e2 JA |
66 | */ |
67 | max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9); | |
8dd2cb7e SL |
68 | sector_div(max_discard_sectors, granularity); |
69 | max_discard_sectors *= granularity; | |
4c64500e | 70 | if (unlikely(!max_discard_sectors)) { |
0f799603 MS |
71 | /* Avoid infinite loop below. Being cautious never hurts. */ |
72 | return -EOPNOTSUPP; | |
10d1f9e2 | 73 | } |
f31e7e40 | 74 | |
dd3932ed | 75 | if (flags & BLKDEV_DISCARD_SECURE) { |
8d57a98c AH |
76 | if (!blk_queue_secdiscard(q)) |
77 | return -EOPNOTSUPP; | |
8c555367 | 78 | type |= REQ_SECURE; |
8d57a98c AH |
79 | } |
80 | ||
5dba3089 LC |
81 | atomic_set(&bb.done, 1); |
82 | bb.flags = 1 << BIO_UPTODATE; | |
83 | bb.wait = &wait; | |
84 | ||
85 | while (nr_sects) { | |
c6e66634 | 86 | unsigned int req_sects; |
8dd2cb7e | 87 | sector_t end_sect, tmp; |
c6e66634 | 88 | |
f31e7e40 | 89 | bio = bio_alloc(gfp_mask, 1); |
66ac0280 CH |
90 | if (!bio) { |
91 | ret = -ENOMEM; | |
92 | break; | |
93 | } | |
94 | ||
c6e66634 PB |
95 | req_sects = min_t(sector_t, nr_sects, max_discard_sectors); |
96 | ||
97 | /* | |
98 | * If splitting a request, and the next starting sector would be | |
99 | * misaligned, stop the discard at the previous aligned sector. | |
100 | */ | |
101 | end_sect = sector + req_sects; | |
8dd2cb7e SL |
102 | tmp = end_sect; |
103 | if (req_sects < nr_sects && | |
104 | sector_div(tmp, granularity) != alignment) { | |
105 | end_sect = end_sect - alignment; | |
106 | sector_div(end_sect, granularity); | |
107 | end_sect = end_sect * granularity + alignment; | |
c6e66634 PB |
108 | req_sects = end_sect - sector; |
109 | } | |
110 | ||
f31e7e40 | 111 | bio->bi_sector = sector; |
5dba3089 | 112 | bio->bi_end_io = bio_batch_end_io; |
f31e7e40 | 113 | bio->bi_bdev = bdev; |
5dba3089 | 114 | bio->bi_private = &bb; |
f31e7e40 | 115 | |
c6e66634 PB |
116 | bio->bi_size = req_sects << 9; |
117 | nr_sects -= req_sects; | |
118 | sector = end_sect; | |
f31e7e40 | 119 | |
5dba3089 | 120 | atomic_inc(&bb.done); |
f31e7e40 | 121 | submit_bio(type, bio); |
5dba3089 | 122 | } |
f31e7e40 | 123 | |
5dba3089 LC |
124 | /* Wait for bios in-flight */ |
125 | if (!atomic_dec_and_test(&bb.done)) | |
dd3932ed | 126 | wait_for_completion(&wait); |
f31e7e40 | 127 | |
8af1954d | 128 | if (!test_bit(BIO_UPTODATE, &bb.flags)) |
5dba3089 | 129 | ret = -EIO; |
66ac0280 | 130 | |
f31e7e40 | 131 | return ret; |
f31e7e40 DM |
132 | } |
133 | EXPORT_SYMBOL(blkdev_issue_discard); | |
3f14d792 | 134 | |
4363ac7c MP |
135 | /** |
136 | * blkdev_issue_write_same - queue a write same operation | |
137 | * @bdev: target blockdev | |
138 | * @sector: start sector | |
139 | * @nr_sects: number of sectors to write | |
140 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
141 | * @page: page containing data to write | |
142 | * | |
143 | * Description: | |
144 | * Issue a write same request for the sectors in question. | |
145 | */ | |
146 | int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, | |
147 | sector_t nr_sects, gfp_t gfp_mask, | |
148 | struct page *page) | |
149 | { | |
150 | DECLARE_COMPLETION_ONSTACK(wait); | |
151 | struct request_queue *q = bdev_get_queue(bdev); | |
152 | unsigned int max_write_same_sectors; | |
153 | struct bio_batch bb; | |
154 | struct bio *bio; | |
155 | int ret = 0; | |
156 | ||
157 | if (!q) | |
158 | return -ENXIO; | |
159 | ||
160 | max_write_same_sectors = q->limits.max_write_same_sectors; | |
161 | ||
162 | if (max_write_same_sectors == 0) | |
163 | return -EOPNOTSUPP; | |
164 | ||
165 | atomic_set(&bb.done, 1); | |
166 | bb.flags = 1 << BIO_UPTODATE; | |
167 | bb.wait = &wait; | |
168 | ||
169 | while (nr_sects) { | |
170 | bio = bio_alloc(gfp_mask, 1); | |
171 | if (!bio) { | |
172 | ret = -ENOMEM; | |
173 | break; | |
174 | } | |
175 | ||
176 | bio->bi_sector = sector; | |
177 | bio->bi_end_io = bio_batch_end_io; | |
178 | bio->bi_bdev = bdev; | |
179 | bio->bi_private = &bb; | |
180 | bio->bi_vcnt = 1; | |
181 | bio->bi_io_vec->bv_page = page; | |
182 | bio->bi_io_vec->bv_offset = 0; | |
183 | bio->bi_io_vec->bv_len = bdev_logical_block_size(bdev); | |
184 | ||
185 | if (nr_sects > max_write_same_sectors) { | |
186 | bio->bi_size = max_write_same_sectors << 9; | |
187 | nr_sects -= max_write_same_sectors; | |
188 | sector += max_write_same_sectors; | |
189 | } else { | |
190 | bio->bi_size = nr_sects << 9; | |
191 | nr_sects = 0; | |
192 | } | |
193 | ||
194 | atomic_inc(&bb.done); | |
195 | submit_bio(REQ_WRITE | REQ_WRITE_SAME, bio); | |
196 | } | |
197 | ||
198 | /* Wait for bios in-flight */ | |
199 | if (!atomic_dec_and_test(&bb.done)) | |
200 | wait_for_completion(&wait); | |
201 | ||
202 | if (!test_bit(BIO_UPTODATE, &bb.flags)) | |
203 | ret = -ENOTSUPP; | |
204 | ||
205 | return ret; | |
206 | } | |
207 | EXPORT_SYMBOL(blkdev_issue_write_same); | |
208 | ||
3f14d792 | 209 | /** |
291d24f6 | 210 | * blkdev_issue_zeroout - generate number of zero filed write bios |
3f14d792 DM |
211 | * @bdev: blockdev to issue |
212 | * @sector: start sector | |
213 | * @nr_sects: number of sectors to write | |
214 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
3f14d792 DM |
215 | * |
216 | * Description: | |
217 | * Generate and issue number of bios with zerofiled pages. | |
3f14d792 DM |
218 | */ |
219 | ||
579e8f3c | 220 | int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 221 | sector_t nr_sects, gfp_t gfp_mask) |
3f14d792 | 222 | { |
18edc8ea | 223 | int ret; |
3f14d792 DM |
224 | struct bio *bio; |
225 | struct bio_batch bb; | |
0aeea189 | 226 | unsigned int sz; |
3f14d792 DM |
227 | DECLARE_COMPLETION_ONSTACK(wait); |
228 | ||
0aeea189 | 229 | atomic_set(&bb.done, 1); |
3f14d792 DM |
230 | bb.flags = 1 << BIO_UPTODATE; |
231 | bb.wait = &wait; | |
3f14d792 | 232 | |
18edc8ea | 233 | ret = 0; |
3f14d792 DM |
234 | while (nr_sects != 0) { |
235 | bio = bio_alloc(gfp_mask, | |
236 | min(nr_sects, (sector_t)BIO_MAX_PAGES)); | |
18edc8ea DM |
237 | if (!bio) { |
238 | ret = -ENOMEM; | |
3f14d792 | 239 | break; |
18edc8ea | 240 | } |
3f14d792 DM |
241 | |
242 | bio->bi_sector = sector; | |
243 | bio->bi_bdev = bdev; | |
244 | bio->bi_end_io = bio_batch_end_io; | |
dd3932ed | 245 | bio->bi_private = &bb; |
3f14d792 | 246 | |
0341aafb JA |
247 | while (nr_sects != 0) { |
248 | sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects); | |
3f14d792 DM |
249 | ret = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0); |
250 | nr_sects -= ret >> 9; | |
251 | sector += ret >> 9; | |
252 | if (ret < (sz << 9)) | |
253 | break; | |
254 | } | |
18edc8ea | 255 | ret = 0; |
0aeea189 | 256 | atomic_inc(&bb.done); |
3f14d792 DM |
257 | submit_bio(WRITE, bio); |
258 | } | |
3f14d792 | 259 | |
dd3932ed | 260 | /* Wait for bios in-flight */ |
0aeea189 | 261 | if (!atomic_dec_and_test(&bb.done)) |
dd3932ed | 262 | wait_for_completion(&wait); |
3f14d792 DM |
263 | |
264 | if (!test_bit(BIO_UPTODATE, &bb.flags)) | |
265 | /* One of bios in the batch was completed with error.*/ | |
266 | ret = -EIO; | |
267 | ||
3f14d792 DM |
268 | return ret; |
269 | } | |
579e8f3c MP |
270 | |
271 | /** | |
272 | * blkdev_issue_zeroout - zero-fill a block range | |
273 | * @bdev: blockdev to write | |
274 | * @sector: start sector | |
275 | * @nr_sects: number of sectors to write | |
276 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
277 | * | |
278 | * Description: | |
279 | * Generate and issue number of bios with zerofiled pages. | |
280 | */ | |
281 | ||
282 | int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, | |
283 | sector_t nr_sects, gfp_t gfp_mask) | |
284 | { | |
285 | if (bdev_write_same(bdev)) { | |
286 | unsigned char bdn[BDEVNAME_SIZE]; | |
287 | ||
288 | if (!blkdev_issue_write_same(bdev, sector, nr_sects, gfp_mask, | |
289 | ZERO_PAGE(0))) | |
290 | return 0; | |
291 | ||
292 | bdevname(bdev, bdn); | |
293 | pr_err("%s: WRITE SAME failed. Manually zeroing.\n", bdn); | |
294 | } | |
295 | ||
296 | return __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask); | |
297 | } | |
3f14d792 | 298 | EXPORT_SYMBOL(blkdev_issue_zeroout); |