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