Commit | Line | Data |
---|---|---|
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; |
f6ff53d3 | 47 | unsigned int granularity; |
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); | |
60 | ||
10d1f9e2 JA |
61 | /* |
62 | * Ensure that max_discard_sectors is of the proper | |
63 | * granularity | |
64 | */ | |
65 | max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9); | |
f6ff53d3 | 66 | max_discard_sectors = round_down(max_discard_sectors, granularity); |
4c64500e | 67 | if (unlikely(!max_discard_sectors)) { |
0f799603 MS |
68 | /* Avoid infinite loop below. Being cautious never hurts. */ |
69 | return -EOPNOTSUPP; | |
10d1f9e2 | 70 | } |
f31e7e40 | 71 | |
dd3932ed | 72 | if (flags & BLKDEV_DISCARD_SECURE) { |
8d57a98c AH |
73 | if (!blk_queue_secdiscard(q)) |
74 | return -EOPNOTSUPP; | |
8c555367 | 75 | type |= REQ_SECURE; |
8d57a98c AH |
76 | } |
77 | ||
5dba3089 LC |
78 | atomic_set(&bb.done, 1); |
79 | bb.flags = 1 << BIO_UPTODATE; | |
80 | bb.wait = &wait; | |
81 | ||
82 | while (nr_sects) { | |
f31e7e40 | 83 | bio = bio_alloc(gfp_mask, 1); |
66ac0280 CH |
84 | if (!bio) { |
85 | ret = -ENOMEM; | |
86 | break; | |
87 | } | |
88 | ||
f31e7e40 | 89 | bio->bi_sector = sector; |
5dba3089 | 90 | bio->bi_end_io = bio_batch_end_io; |
f31e7e40 | 91 | bio->bi_bdev = bdev; |
5dba3089 | 92 | bio->bi_private = &bb; |
f31e7e40 | 93 | |
f31e7e40 DM |
94 | if (nr_sects > max_discard_sectors) { |
95 | bio->bi_size = max_discard_sectors << 9; | |
96 | nr_sects -= max_discard_sectors; | |
97 | sector += max_discard_sectors; | |
98 | } else { | |
99 | bio->bi_size = nr_sects << 9; | |
100 | nr_sects = 0; | |
101 | } | |
102 | ||
5dba3089 | 103 | atomic_inc(&bb.done); |
f31e7e40 | 104 | submit_bio(type, bio); |
5dba3089 | 105 | } |
f31e7e40 | 106 | |
5dba3089 LC |
107 | /* Wait for bios in-flight */ |
108 | if (!atomic_dec_and_test(&bb.done)) | |
dd3932ed | 109 | wait_for_completion(&wait); |
f31e7e40 | 110 | |
8af1954d | 111 | if (!test_bit(BIO_UPTODATE, &bb.flags)) |
5dba3089 | 112 | ret = -EIO; |
66ac0280 | 113 | |
f31e7e40 | 114 | return ret; |
f31e7e40 DM |
115 | } |
116 | EXPORT_SYMBOL(blkdev_issue_discard); | |
3f14d792 | 117 | |
3f14d792 | 118 | /** |
291d24f6 | 119 | * blkdev_issue_zeroout - generate number of zero filed write bios |
3f14d792 DM |
120 | * @bdev: blockdev to issue |
121 | * @sector: start sector | |
122 | * @nr_sects: number of sectors to write | |
123 | * @gfp_mask: memory allocation flags (for bio_alloc) | |
3f14d792 DM |
124 | * |
125 | * Description: | |
126 | * Generate and issue number of bios with zerofiled pages. | |
3f14d792 DM |
127 | */ |
128 | ||
129 | int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, | |
dd3932ed | 130 | sector_t nr_sects, gfp_t gfp_mask) |
3f14d792 | 131 | { |
18edc8ea | 132 | int ret; |
3f14d792 DM |
133 | struct bio *bio; |
134 | struct bio_batch bb; | |
0aeea189 | 135 | unsigned int sz; |
3f14d792 DM |
136 | DECLARE_COMPLETION_ONSTACK(wait); |
137 | ||
0aeea189 | 138 | atomic_set(&bb.done, 1); |
3f14d792 DM |
139 | bb.flags = 1 << BIO_UPTODATE; |
140 | bb.wait = &wait; | |
3f14d792 | 141 | |
18edc8ea | 142 | ret = 0; |
3f14d792 DM |
143 | while (nr_sects != 0) { |
144 | bio = bio_alloc(gfp_mask, | |
145 | min(nr_sects, (sector_t)BIO_MAX_PAGES)); | |
18edc8ea DM |
146 | if (!bio) { |
147 | ret = -ENOMEM; | |
3f14d792 | 148 | break; |
18edc8ea | 149 | } |
3f14d792 DM |
150 | |
151 | bio->bi_sector = sector; | |
152 | bio->bi_bdev = bdev; | |
153 | bio->bi_end_io = bio_batch_end_io; | |
dd3932ed | 154 | bio->bi_private = &bb; |
3f14d792 | 155 | |
0341aafb JA |
156 | while (nr_sects != 0) { |
157 | sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects); | |
3f14d792 DM |
158 | ret = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0); |
159 | nr_sects -= ret >> 9; | |
160 | sector += ret >> 9; | |
161 | if (ret < (sz << 9)) | |
162 | break; | |
163 | } | |
18edc8ea | 164 | ret = 0; |
0aeea189 | 165 | atomic_inc(&bb.done); |
3f14d792 DM |
166 | submit_bio(WRITE, bio); |
167 | } | |
3f14d792 | 168 | |
dd3932ed | 169 | /* Wait for bios in-flight */ |
0aeea189 | 170 | if (!atomic_dec_and_test(&bb.done)) |
dd3932ed | 171 | wait_for_completion(&wait); |
3f14d792 DM |
172 | |
173 | if (!test_bit(BIO_UPTODATE, &bb.flags)) | |
174 | /* One of bios in the batch was completed with error.*/ | |
175 | ret = -EIO; | |
176 | ||
3f14d792 DM |
177 | return ret; |
178 | } | |
179 | EXPORT_SYMBOL(blkdev_issue_zeroout); |