Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 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 | |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 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) |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 19 | { |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 20 | struct bio_batch *bb = bio->bi_private; |
| 21 | |
Lukas Czerner | 8af1954 | 2011-05-06 19:30:01 -0600 | [diff] [blame] | 22 | if (err && (err != -EOPNOTSUPP)) |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 23 | clear_bit(BIO_UPTODATE, &bb->flags); |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 24 | if (atomic_dec_and_test(&bb->done)) |
| 25 | complete(bb->wait); |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 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); |
Christoph Hellwig | 8c55536 | 2010-08-18 05:29:22 -0400 | [diff] [blame] | 45 | int type = REQ_WRITE | REQ_DISCARD; |
Jens Axboe | 10d1f9e | 2010-07-15 10:49:31 -0600 | [diff] [blame] | 46 | unsigned int max_discard_sectors; |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 47 | struct bio_batch bb; |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 48 | struct bio *bio; |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 49 | int ret = 0; |
| 50 | |
| 51 | if (!q) |
| 52 | return -ENXIO; |
| 53 | |
| 54 | if (!blk_queue_discard(q)) |
| 55 | return -EOPNOTSUPP; |
| 56 | |
Jens Axboe | 10d1f9e | 2010-07-15 10:49:31 -0600 | [diff] [blame] | 57 | /* |
| 58 | * Ensure that max_discard_sectors is of the proper |
| 59 | * granularity |
| 60 | */ |
| 61 | max_discard_sectors = min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
| 62 | if (q->limits.discard_granularity) { |
| 63 | unsigned int disc_sects = q->limits.discard_granularity >> 9; |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 64 | |
Jens Axboe | 10d1f9e | 2010-07-15 10:49:31 -0600 | [diff] [blame] | 65 | max_discard_sectors &= ~(disc_sects - 1); |
| 66 | } |
| 67 | |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 68 | if (flags & BLKDEV_DISCARD_SECURE) { |
Adrian Hunter | 8d57a98 | 2010-08-11 14:17:49 -0700 | [diff] [blame] | 69 | if (!blk_queue_secdiscard(q)) |
| 70 | return -EOPNOTSUPP; |
Christoph Hellwig | 8c55536 | 2010-08-18 05:29:22 -0400 | [diff] [blame] | 71 | type |= REQ_SECURE; |
Adrian Hunter | 8d57a98 | 2010-08-11 14:17:49 -0700 | [diff] [blame] | 72 | } |
| 73 | |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 74 | atomic_set(&bb.done, 1); |
| 75 | bb.flags = 1 << BIO_UPTODATE; |
| 76 | bb.wait = &wait; |
| 77 | |
| 78 | while (nr_sects) { |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 79 | bio = bio_alloc(gfp_mask, 1); |
Christoph Hellwig | 66ac028 | 2010-06-18 16:59:42 +0200 | [diff] [blame] | 80 | if (!bio) { |
| 81 | ret = -ENOMEM; |
| 82 | break; |
| 83 | } |
| 84 | |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 85 | bio->bi_sector = sector; |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 86 | bio->bi_end_io = bio_batch_end_io; |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 87 | bio->bi_bdev = bdev; |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 88 | bio->bi_private = &bb; |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 89 | |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 90 | if (nr_sects > max_discard_sectors) { |
| 91 | bio->bi_size = max_discard_sectors << 9; |
| 92 | nr_sects -= max_discard_sectors; |
| 93 | sector += max_discard_sectors; |
| 94 | } else { |
| 95 | bio->bi_size = nr_sects << 9; |
| 96 | nr_sects = 0; |
| 97 | } |
| 98 | |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 99 | atomic_inc(&bb.done); |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 100 | submit_bio(type, bio); |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 101 | } |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 102 | |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 103 | /* Wait for bios in-flight */ |
| 104 | if (!atomic_dec_and_test(&bb.done)) |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 105 | wait_for_completion(&wait); |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 106 | |
Lukas Czerner | 8af1954 | 2011-05-06 19:30:01 -0600 | [diff] [blame] | 107 | if (!test_bit(BIO_UPTODATE, &bb.flags)) |
Lukas Czerner | 5dba308 | 2011-05-06 19:26:27 -0600 | [diff] [blame] | 108 | ret = -EIO; |
Christoph Hellwig | 66ac028 | 2010-06-18 16:59:42 +0200 | [diff] [blame] | 109 | |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 110 | return ret; |
Dmitry Monakhov | f31e7e4 | 2010-04-28 17:55:08 +0400 | [diff] [blame] | 111 | } |
| 112 | EXPORT_SYMBOL(blkdev_issue_discard); |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 113 | |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 114 | /** |
Maya Erez | 73937f5 | 2012-05-24 23:33:05 +0300 | [diff] [blame^] | 115 | * blkdev_issue_sanitize - queue a sanitize request |
| 116 | * @bdev: blockdev to issue sanitize for |
| 117 | * @gfp_mask: memory allocation flags (for bio_alloc) |
| 118 | * |
| 119 | * Description: |
| 120 | * Issue a sanitize request for the specified block device |
| 121 | */ |
| 122 | int blkdev_issue_sanitize(struct block_device *bdev, gfp_t gfp_mask) |
| 123 | { |
| 124 | DECLARE_COMPLETION_ONSTACK(wait); |
| 125 | struct request_queue *q = bdev_get_queue(bdev); |
| 126 | int type = REQ_WRITE | REQ_SANITIZE; |
| 127 | struct bio_batch bb; |
| 128 | struct bio *bio; |
| 129 | int ret = 0; |
| 130 | |
| 131 | if (!q) |
| 132 | return -ENXIO; |
| 133 | |
| 134 | if (!blk_queue_sanitize(q)) { |
| 135 | pr_err("%s - card doesn't support sanitize", __func__); |
| 136 | return -EOPNOTSUPP; |
| 137 | } |
| 138 | |
| 139 | bio = bio_alloc(gfp_mask, 1); |
| 140 | if (!bio) |
| 141 | return -ENOMEM; |
| 142 | |
| 143 | atomic_set(&bb.done, 1); |
| 144 | bb.flags = 1 << BIO_UPTODATE; |
| 145 | bb.wait = &wait; |
| 146 | |
| 147 | bio->bi_end_io = bio_batch_end_io; |
| 148 | bio->bi_bdev = bdev; |
| 149 | bio->bi_private = &bb; |
| 150 | |
| 151 | atomic_inc(&bb.done); |
| 152 | submit_bio(type, bio); |
| 153 | |
| 154 | /* Wait for bios in-flight */ |
| 155 | if (!atomic_dec_and_test(&bb.done)) |
| 156 | wait_for_completion(&wait); |
| 157 | |
| 158 | if (!test_bit(BIO_UPTODATE, &bb.flags)) |
| 159 | ret = -EIO; |
| 160 | |
| 161 | return ret; |
| 162 | } |
| 163 | EXPORT_SYMBOL(blkdev_issue_sanitize); |
| 164 | |
| 165 | /** |
Ben Hutchings | 291d24f | 2011-03-01 13:45:24 -0500 | [diff] [blame] | 166 | * blkdev_issue_zeroout - generate number of zero filed write bios |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 167 | * @bdev: blockdev to issue |
| 168 | * @sector: start sector |
| 169 | * @nr_sects: number of sectors to write |
| 170 | * @gfp_mask: memory allocation flags (for bio_alloc) |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 171 | * |
| 172 | * Description: |
| 173 | * Generate and issue number of bios with zerofiled pages. |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 174 | */ |
| 175 | |
| 176 | int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 177 | sector_t nr_sects, gfp_t gfp_mask) |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 178 | { |
Dmitry Monakhov | 18edc8e | 2010-08-06 13:23:25 +0200 | [diff] [blame] | 179 | int ret; |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 180 | struct bio *bio; |
| 181 | struct bio_batch bb; |
Lukas Czerner | 0aeea18 | 2011-03-11 10:23:53 +0100 | [diff] [blame] | 182 | unsigned int sz; |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 183 | DECLARE_COMPLETION_ONSTACK(wait); |
| 184 | |
Lukas Czerner | 0aeea18 | 2011-03-11 10:23:53 +0100 | [diff] [blame] | 185 | atomic_set(&bb.done, 1); |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 186 | bb.flags = 1 << BIO_UPTODATE; |
| 187 | bb.wait = &wait; |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 188 | |
Dmitry Monakhov | 18edc8e | 2010-08-06 13:23:25 +0200 | [diff] [blame] | 189 | ret = 0; |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 190 | while (nr_sects != 0) { |
| 191 | bio = bio_alloc(gfp_mask, |
| 192 | min(nr_sects, (sector_t)BIO_MAX_PAGES)); |
Dmitry Monakhov | 18edc8e | 2010-08-06 13:23:25 +0200 | [diff] [blame] | 193 | if (!bio) { |
| 194 | ret = -ENOMEM; |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 195 | break; |
Dmitry Monakhov | 18edc8e | 2010-08-06 13:23:25 +0200 | [diff] [blame] | 196 | } |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 197 | |
| 198 | bio->bi_sector = sector; |
| 199 | bio->bi_bdev = bdev; |
| 200 | bio->bi_end_io = bio_batch_end_io; |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 201 | bio->bi_private = &bb; |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 202 | |
Jens Axboe | 0341aaf | 2010-04-29 09:28:21 +0200 | [diff] [blame] | 203 | while (nr_sects != 0) { |
| 204 | sz = min((sector_t) PAGE_SIZE >> 9 , nr_sects); |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 205 | ret = bio_add_page(bio, ZERO_PAGE(0), sz << 9, 0); |
| 206 | nr_sects -= ret >> 9; |
| 207 | sector += ret >> 9; |
| 208 | if (ret < (sz << 9)) |
| 209 | break; |
| 210 | } |
Dmitry Monakhov | 18edc8e | 2010-08-06 13:23:25 +0200 | [diff] [blame] | 211 | ret = 0; |
Lukas Czerner | 0aeea18 | 2011-03-11 10:23:53 +0100 | [diff] [blame] | 212 | atomic_inc(&bb.done); |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 213 | submit_bio(WRITE, bio); |
| 214 | } |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 215 | |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 216 | /* Wait for bios in-flight */ |
Lukas Czerner | 0aeea18 | 2011-03-11 10:23:53 +0100 | [diff] [blame] | 217 | if (!atomic_dec_and_test(&bb.done)) |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 218 | wait_for_completion(&wait); |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 219 | |
| 220 | if (!test_bit(BIO_UPTODATE, &bb.flags)) |
| 221 | /* One of bios in the batch was completed with error.*/ |
| 222 | ret = -EIO; |
| 223 | |
Dmitry Monakhov | 3f14d79 | 2010-04-28 17:55:09 +0400 | [diff] [blame] | 224 | return ret; |
| 225 | } |
| 226 | EXPORT_SYMBOL(blkdev_issue_zeroout); |