Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 1 | /* |
| 2 | * bio-integrity.c - bio data integrity extensions |
| 3 | * |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 4 | * Copyright (C) 2007, 2008, 2009 Oracle Corporation |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 5 | * Written by: Martin K. Petersen <martin.petersen@oracle.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License version |
| 9 | * 2 as published by the Free Software Foundation. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, but |
| 12 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; see the file COPYING. If not, write to |
| 18 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, |
| 19 | * USA. |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <linux/blkdev.h> |
| 24 | #include <linux/mempool.h> |
Paul Gortmaker | afeacc8 | 2011-05-26 16:00:52 -0400 | [diff] [blame] | 25 | #include <linux/export.h> |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 26 | #include <linux/bio.h> |
| 27 | #include <linux/workqueue.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 28 | #include <linux/slab.h> |
Bart Van Assche | 1179a5a | 2016-06-14 17:03:45 +0200 | [diff] [blame] | 29 | #include "blk.h" |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 30 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 31 | #define BIP_INLINE_VECS 4 |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 32 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 33 | static struct kmem_cache *bip_slab; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 34 | static struct workqueue_struct *kintegrityd_wq; |
| 35 | |
Dan Williams | 5a48fc1 | 2015-10-21 13:20:23 -0400 | [diff] [blame] | 36 | void blk_flush_integrity(void) |
| 37 | { |
| 38 | flush_workqueue(kintegrityd_wq); |
| 39 | } |
| 40 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 41 | /** |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 42 | * bio_integrity_alloc - Allocate integrity payload and attach it to bio |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 43 | * @bio: bio to attach integrity metadata to |
| 44 | * @gfp_mask: Memory allocation mask |
| 45 | * @nr_vecs: Number of integrity metadata scatter-gather elements |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 46 | * |
| 47 | * Description: This function prepares a bio for attaching integrity |
| 48 | * metadata. nr_vecs specifies the maximum number of pages containing |
| 49 | * integrity metadata that can be attached. |
| 50 | */ |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 51 | struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, |
| 52 | gfp_t gfp_mask, |
| 53 | unsigned int nr_vecs) |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 54 | { |
| 55 | struct bio_integrity_payload *bip; |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 56 | struct bio_set *bs = bio->bi_pool; |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 57 | unsigned inline_vecs; |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 58 | |
Mike Snitzer | bb8bd38 | 2015-07-01 12:57:40 -0400 | [diff] [blame] | 59 | if (!bs || !bs->bio_integrity_pool) { |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 60 | bip = kmalloc(sizeof(struct bio_integrity_payload) + |
| 61 | sizeof(struct bio_vec) * nr_vecs, gfp_mask); |
| 62 | inline_vecs = nr_vecs; |
| 63 | } else { |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 64 | bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 65 | inline_vecs = BIP_INLINE_VECS; |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 66 | } |
| 67 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 68 | if (unlikely(!bip)) |
Keith Busch | 06c1e39 | 2015-12-03 09:32:21 -0700 | [diff] [blame] | 69 | return ERR_PTR(-ENOMEM); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 70 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 71 | memset(bip, 0, sizeof(*bip)); |
| 72 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 73 | if (nr_vecs > inline_vecs) { |
Christoph Hellwig | ed996a5 | 2016-07-19 11:28:42 +0200 | [diff] [blame] | 74 | unsigned long idx = 0; |
| 75 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 76 | bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx, |
| 77 | bs->bvec_integrity_pool); |
| 78 | if (!bip->bip_vec) |
| 79 | goto err; |
Gu Zheng | cbcd1054 | 2014-07-01 10:36:47 -0600 | [diff] [blame] | 80 | bip->bip_max_vcnt = bvec_nr_vecs(idx); |
Christoph Hellwig | ed996a5 | 2016-07-19 11:28:42 +0200 | [diff] [blame] | 81 | bip->bip_slab = idx; |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 82 | } else { |
| 83 | bip->bip_vec = bip->bip_inline_vecs; |
Gu Zheng | cbcd1054 | 2014-07-01 10:36:47 -0600 | [diff] [blame] | 84 | bip->bip_max_vcnt = inline_vecs; |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 85 | } |
| 86 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 87 | bip->bip_bio = bio; |
| 88 | bio->bi_integrity = bip; |
Jens Axboe | 1eff9d3 | 2016-08-05 15:35:16 -0600 | [diff] [blame] | 89 | bio->bi_opf |= REQ_INTEGRITY; |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 90 | |
| 91 | return bip; |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 92 | err: |
| 93 | mempool_free(bip, bs->bio_integrity_pool); |
Keith Busch | 06c1e39 | 2015-12-03 09:32:21 -0700 | [diff] [blame] | 94 | return ERR_PTR(-ENOMEM); |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 95 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 96 | EXPORT_SYMBOL(bio_integrity_alloc); |
| 97 | |
| 98 | /** |
| 99 | * bio_integrity_free - Free bio integrity payload |
| 100 | * @bio: bio containing bip to be freed |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 101 | * |
| 102 | * Description: Used to free the integrity portion of a bio. Usually |
| 103 | * called from bio_free(). |
| 104 | */ |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 105 | void bio_integrity_free(struct bio *bio) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 106 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 107 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 108 | struct bio_set *bs = bio->bi_pool; |
| 109 | |
Martin K. Petersen | b1f013885 | 2014-09-26 19:20:04 -0400 | [diff] [blame] | 110 | if (bip->bip_flags & BIP_BLOCK_INTEGRITY) |
Martin K. Petersen | 5f9378f | 2014-09-26 19:19:58 -0400 | [diff] [blame] | 111 | kfree(page_address(bip->bip_vec->bv_page) + |
| 112 | bip->bip_vec->bv_offset); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 113 | |
Mike Snitzer | bb8bd38 | 2015-07-01 12:57:40 -0400 | [diff] [blame] | 114 | if (bs && bs->bio_integrity_pool) { |
Christoph Hellwig | ed996a5 | 2016-07-19 11:28:42 +0200 | [diff] [blame] | 115 | bvec_free(bs->bvec_integrity_pool, bip->bip_vec, bip->bip_slab); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 116 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 117 | mempool_free(bip, bs->bio_integrity_pool); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 118 | } else { |
| 119 | kfree(bip); |
| 120 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 121 | |
| 122 | bio->bi_integrity = NULL; |
| 123 | } |
| 124 | EXPORT_SYMBOL(bio_integrity_free); |
| 125 | |
| 126 | /** |
| 127 | * bio_integrity_add_page - Attach integrity metadata |
| 128 | * @bio: bio to update |
| 129 | * @page: page containing integrity metadata |
| 130 | * @len: number of bytes of integrity metadata in page |
| 131 | * @offset: start offset within page |
| 132 | * |
| 133 | * Description: Attach a page containing integrity metadata to bio. |
| 134 | */ |
| 135 | int bio_integrity_add_page(struct bio *bio, struct page *page, |
| 136 | unsigned int len, unsigned int offset) |
| 137 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 138 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 139 | struct bio_vec *iv; |
| 140 | |
Gu Zheng | cbcd1054 | 2014-07-01 10:36:47 -0600 | [diff] [blame] | 141 | if (bip->bip_vcnt >= bip->bip_max_vcnt) { |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 142 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
| 143 | return 0; |
| 144 | } |
| 145 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 146 | iv = bip->bip_vec + bip->bip_vcnt; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 147 | |
Sagi Grimberg | 87a816d | 2015-09-08 09:33:35 -0600 | [diff] [blame] | 148 | if (bip->bip_vcnt && |
| 149 | bvec_gap_to_prev(bdev_get_queue(bio->bi_bdev), |
| 150 | &bip->bip_vec[bip->bip_vcnt - 1], offset)) |
| 151 | return 0; |
| 152 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 153 | iv->bv_page = page; |
| 154 | iv->bv_len = len; |
| 155 | iv->bv_offset = offset; |
| 156 | bip->bip_vcnt++; |
| 157 | |
| 158 | return len; |
| 159 | } |
| 160 | EXPORT_SYMBOL(bio_integrity_add_page); |
| 161 | |
| 162 | /** |
| 163 | * bio_integrity_enabled - Check whether integrity can be passed |
| 164 | * @bio: bio to check |
| 165 | * |
| 166 | * Description: Determines whether bio_integrity_prep() can be called |
| 167 | * on this bio or not. bio data direction and target device must be |
| 168 | * set prior to calling. The functions honors the write_generate and |
| 169 | * read_verify flags in sysfs. |
| 170 | */ |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 171 | bool bio_integrity_enabled(struct bio *bio) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 172 | { |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 173 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
| 174 | |
Martin K. Petersen | e69f18f | 2014-04-08 22:59:31 -0400 | [diff] [blame] | 175 | if (!bio_is_rw(bio)) |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 176 | return false; |
Martin K. Petersen | e69f18f | 2014-04-08 22:59:31 -0400 | [diff] [blame] | 177 | |
Dmitry Monakhov | 7f85131 | 2017-05-10 19:20:44 +0400 | [diff] [blame] | 178 | if (!bio_sectors(bio)) |
| 179 | return false; |
| 180 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 181 | /* Already protected? */ |
| 182 | if (bio_integrity(bio)) |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 183 | return false; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 184 | |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 185 | if (bi == NULL) |
| 186 | return false; |
| 187 | |
Martin K. Petersen | 0f8087e | 2015-10-21 13:19:33 -0400 | [diff] [blame] | 188 | if (bio_data_dir(bio) == READ && bi->profile->verify_fn != NULL && |
Martin K. Petersen | 8288f49 | 2014-09-26 19:20:02 -0400 | [diff] [blame] | 189 | (bi->flags & BLK_INTEGRITY_VERIFY)) |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 190 | return true; |
| 191 | |
Martin K. Petersen | 0f8087e | 2015-10-21 13:19:33 -0400 | [diff] [blame] | 192 | if (bio_data_dir(bio) == WRITE && bi->profile->generate_fn != NULL && |
Martin K. Petersen | 8288f49 | 2014-09-26 19:20:02 -0400 | [diff] [blame] | 193 | (bi->flags & BLK_INTEGRITY_GENERATE)) |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 194 | return true; |
| 195 | |
| 196 | return false; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 197 | } |
| 198 | EXPORT_SYMBOL(bio_integrity_enabled); |
| 199 | |
| 200 | /** |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 201 | * bio_integrity_intervals - Return number of integrity intervals for a bio |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 202 | * @bi: blk_integrity profile for device |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 203 | * @sectors: Size of the bio in 512-byte sectors |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 204 | * |
| 205 | * Description: The block layer calculates everything in 512 byte |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 206 | * sectors but integrity metadata is done in terms of the data integrity |
| 207 | * interval size of the storage device. Convert the block layer sectors |
| 208 | * to the appropriate number of integrity intervals. |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 209 | */ |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 210 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
| 211 | unsigned int sectors) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 212 | { |
Martin K. Petersen | a48f041 | 2015-10-21 13:19:38 -0400 | [diff] [blame] | 213 | return sectors >> (bi->interval_exp - 9); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 214 | } |
| 215 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 216 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
| 217 | unsigned int sectors) |
| 218 | { |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 219 | return bio_integrity_intervals(bi, sectors) * bi->tuple_size; |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 220 | } |
| 221 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 222 | /** |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 223 | * bio_integrity_process - Process integrity metadata for a bio |
Gu Zheng | bf36f9c | 2014-02-21 18:10:59 +0800 | [diff] [blame] | 224 | * @bio: bio to generate/verify integrity metadata for |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 225 | * @proc_fn: Pointer to the relevant processing function |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 226 | */ |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 227 | static int bio_integrity_process(struct bio *bio, |
| 228 | integrity_processing_fn *proc_fn) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 229 | { |
| 230 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 231 | struct blk_integrity_iter iter; |
Darrick J. Wong | 594416a | 2014-11-25 17:40:25 -0800 | [diff] [blame] | 232 | struct bvec_iter bviter; |
| 233 | struct bio_vec bv; |
Martin K. Petersen | 5f9378f | 2014-09-26 19:19:58 -0400 | [diff] [blame] | 234 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Darrick J. Wong | 594416a | 2014-11-25 17:40:25 -0800 | [diff] [blame] | 235 | unsigned int ret = 0; |
Martin K. Petersen | 5f9378f | 2014-09-26 19:19:58 -0400 | [diff] [blame] | 236 | void *prot_buf = page_address(bip->bip_vec->bv_page) + |
| 237 | bip->bip_vec->bv_offset; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 238 | |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 239 | iter.disk_name = bio->bi_bdev->bd_disk->disk_name; |
Martin K. Petersen | a48f041 | 2015-10-21 13:19:38 -0400 | [diff] [blame] | 240 | iter.interval = 1 << bi->interval_exp; |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 241 | iter.seed = bip_get_seed(bip); |
| 242 | iter.prot_buf = prot_buf; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 243 | |
Darrick J. Wong | 594416a | 2014-11-25 17:40:25 -0800 | [diff] [blame] | 244 | bio_for_each_segment(bv, bio, bviter) { |
| 245 | void *kaddr = kmap_atomic(bv.bv_page); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 246 | |
Darrick J. Wong | 594416a | 2014-11-25 17:40:25 -0800 | [diff] [blame] | 247 | iter.data_buf = kaddr + bv.bv_offset; |
| 248 | iter.data_size = bv.bv_len; |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 249 | |
| 250 | ret = proc_fn(&iter); |
| 251 | if (ret) { |
| 252 | kunmap_atomic(kaddr); |
| 253 | return ret; |
Gu Zheng | bf36f9c | 2014-02-21 18:10:59 +0800 | [diff] [blame] | 254 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 255 | |
Cong Wang | e8e3c3d | 2011-11-25 23:14:27 +0800 | [diff] [blame] | 256 | kunmap_atomic(kaddr); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 257 | } |
Gu Zheng | bf36f9c | 2014-02-21 18:10:59 +0800 | [diff] [blame] | 258 | return ret; |
| 259 | } |
| 260 | |
| 261 | /** |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 262 | * bio_integrity_prep - Prepare bio for integrity I/O |
| 263 | * @bio: bio to prepare |
| 264 | * |
| 265 | * Description: Allocates a buffer for integrity metadata, maps the |
| 266 | * pages and attaches them to a bio. The bio must have data |
| 267 | * direction, target device and start sector set priot to calling. In |
| 268 | * the WRITE case, integrity metadata will be generated using the |
| 269 | * block device's integrity function. In the READ case, the buffer |
| 270 | * will be prepared for DMA and a suitable end_io handler set up. |
| 271 | */ |
| 272 | int bio_integrity_prep(struct bio *bio) |
| 273 | { |
| 274 | struct bio_integrity_payload *bip; |
| 275 | struct blk_integrity *bi; |
| 276 | struct request_queue *q; |
| 277 | void *buf; |
| 278 | unsigned long start, end; |
| 279 | unsigned int len, nr_pages; |
| 280 | unsigned int bytes, offset, i; |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 281 | unsigned int intervals; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 282 | |
| 283 | bi = bdev_get_integrity(bio->bi_bdev); |
| 284 | q = bdev_get_queue(bio->bi_bdev); |
| 285 | BUG_ON(bi == NULL); |
| 286 | BUG_ON(bio_integrity(bio)); |
| 287 | |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 288 | intervals = bio_integrity_intervals(bi, bio_sectors(bio)); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 289 | |
| 290 | /* Allocate kernel buffer for protection data */ |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 291 | len = intervals * bi->tuple_size; |
David Rientjes | 72f4650 | 2010-08-23 13:35:09 +0200 | [diff] [blame] | 292 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 293 | if (unlikely(buf == NULL)) { |
| 294 | printk(KERN_ERR "could not allocate integrity buffer\n"); |
Andrew Morton | 220eb7f | 2010-08-23 13:36:20 +0200 | [diff] [blame] | 295 | return -ENOMEM; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 296 | } |
| 297 | |
| 298 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 299 | start = ((unsigned long) buf) >> PAGE_SHIFT; |
| 300 | nr_pages = end - start; |
| 301 | |
| 302 | /* Allocate bio integrity payload and integrity vectors */ |
| 303 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); |
Dan Carpenter | 7b6c0f8 | 2015-12-09 13:21:23 +0300 | [diff] [blame] | 304 | if (IS_ERR(bip)) { |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 305 | printk(KERN_ERR "could not allocate data integrity bioset\n"); |
| 306 | kfree(buf); |
Dan Carpenter | 7b6c0f8 | 2015-12-09 13:21:23 +0300 | [diff] [blame] | 307 | return PTR_ERR(bip); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 308 | } |
| 309 | |
Martin K. Petersen | b1f013885 | 2014-09-26 19:20:04 -0400 | [diff] [blame] | 310 | bip->bip_flags |= BIP_BLOCK_INTEGRITY; |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 311 | bip->bip_iter.bi_size = len; |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 312 | bip_set_seed(bip, bio->bi_iter.bi_sector); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 313 | |
Martin K. Petersen | aae7df5 | 2014-09-26 19:20:05 -0400 | [diff] [blame] | 314 | if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM) |
| 315 | bip->bip_flags |= BIP_IP_CHECKSUM; |
| 316 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 317 | /* Map it */ |
| 318 | offset = offset_in_page(buf); |
| 319 | for (i = 0 ; i < nr_pages ; i++) { |
| 320 | int ret; |
| 321 | bytes = PAGE_SIZE - offset; |
| 322 | |
| 323 | if (len <= 0) |
| 324 | break; |
| 325 | |
| 326 | if (bytes > len) |
| 327 | bytes = len; |
| 328 | |
| 329 | ret = bio_integrity_add_page(bio, virt_to_page(buf), |
| 330 | bytes, offset); |
| 331 | |
| 332 | if (ret == 0) |
| 333 | return 0; |
| 334 | |
| 335 | if (ret < bytes) |
| 336 | break; |
| 337 | |
| 338 | buf += bytes; |
| 339 | len -= bytes; |
| 340 | offset = 0; |
| 341 | } |
| 342 | |
| 343 | /* Install custom I/O completion handler if read verify is enabled */ |
| 344 | if (bio_data_dir(bio) == READ) { |
| 345 | bip->bip_end_io = bio->bi_end_io; |
| 346 | bio->bi_end_io = bio_integrity_endio; |
| 347 | } |
| 348 | |
| 349 | /* Auto-generate integrity metadata if this is a write */ |
| 350 | if (bio_data_dir(bio) == WRITE) |
Martin K. Petersen | 0f8087e | 2015-10-21 13:19:33 -0400 | [diff] [blame] | 351 | bio_integrity_process(bio, bi->profile->generate_fn); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 352 | |
| 353 | return 0; |
| 354 | } |
| 355 | EXPORT_SYMBOL(bio_integrity_prep); |
| 356 | |
| 357 | /** |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 358 | * bio_integrity_verify_fn - Integrity I/O completion worker |
| 359 | * @work: Work struct stored in bio to be verified |
| 360 | * |
| 361 | * Description: This workqueue function is called to complete a READ |
| 362 | * request. The function verifies the transferred integrity metadata |
| 363 | * and then calls the original bio end_io function. |
| 364 | */ |
| 365 | static void bio_integrity_verify_fn(struct work_struct *work) |
| 366 | { |
Jens Axboe | b984679 | 2008-06-17 19:05:48 +0200 | [diff] [blame] | 367 | struct bio_integrity_payload *bip = |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 368 | container_of(work, struct bio_integrity_payload, bip_work); |
| 369 | struct bio *bio = bip->bip_bio; |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 370 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 371 | |
Martin K. Petersen | 0f8087e | 2015-10-21 13:19:33 -0400 | [diff] [blame] | 372 | bio->bi_error = bio_integrity_process(bio, bi->profile->verify_fn); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 373 | |
| 374 | /* Restore original bio completion handler */ |
| 375 | bio->bi_end_io = bip->bip_end_io; |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 376 | bio_endio(bio); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 377 | } |
| 378 | |
| 379 | /** |
| 380 | * bio_integrity_endio - Integrity I/O completion function |
| 381 | * @bio: Protected bio |
| 382 | * @error: Pointer to errno |
| 383 | * |
| 384 | * Description: Completion for integrity I/O |
| 385 | * |
| 386 | * Normally I/O completion is done in interrupt context. However, |
| 387 | * verifying I/O integrity is a time-consuming task which must be run |
| 388 | * in process context. This function postpones completion |
| 389 | * accordingly. |
| 390 | */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 391 | void bio_integrity_endio(struct bio *bio) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 392 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 393 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 394 | |
| 395 | BUG_ON(bip->bip_bio != bio); |
| 396 | |
Martin K. Petersen | 7b24fc4 | 2009-01-04 02:43:38 -0500 | [diff] [blame] | 397 | /* In case of an I/O error there is no point in verifying the |
| 398 | * integrity metadata. Restore original bio end_io handler |
| 399 | * and run it. |
| 400 | */ |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 401 | if (bio->bi_error) { |
Martin K. Petersen | 7b24fc4 | 2009-01-04 02:43:38 -0500 | [diff] [blame] | 402 | bio->bi_end_io = bip->bip_end_io; |
Christoph Hellwig | 4246a0b | 2015-07-20 15:29:37 +0200 | [diff] [blame] | 403 | bio_endio(bio); |
Martin K. Petersen | 7b24fc4 | 2009-01-04 02:43:38 -0500 | [diff] [blame] | 404 | |
| 405 | return; |
| 406 | } |
| 407 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 408 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
| 409 | queue_work(kintegrityd_wq, &bip->bip_work); |
| 410 | } |
| 411 | EXPORT_SYMBOL(bio_integrity_endio); |
| 412 | |
| 413 | /** |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 414 | * bio_integrity_advance - Advance integrity vector |
| 415 | * @bio: bio whose integrity vector to update |
| 416 | * @bytes_done: number of data bytes that have been completed |
| 417 | * |
| 418 | * Description: This function calculates how many integrity bytes the |
| 419 | * number of completed data bytes correspond to and advances the |
| 420 | * integrity vector accordingly. |
| 421 | */ |
| 422 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) |
| 423 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 424 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 425 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 426 | unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 427 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 428 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 429 | } |
| 430 | EXPORT_SYMBOL(bio_integrity_advance); |
| 431 | |
| 432 | /** |
| 433 | * bio_integrity_trim - Trim integrity vector |
| 434 | * @bio: bio whose integrity vector to update |
| 435 | * @offset: offset to first data sector |
| 436 | * @sectors: number of data sectors |
| 437 | * |
| 438 | * Description: Used to trim the integrity vector in a cloned bio. |
| 439 | * The ivec will be advanced corresponding to 'offset' data sectors |
| 440 | * and the length will be truncated corresponding to 'len' data |
| 441 | * sectors. |
| 442 | */ |
Jens Axboe | b984679 | 2008-06-17 19:05:48 +0200 | [diff] [blame] | 443 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
| 444 | unsigned int sectors) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 445 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 446 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 447 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 448 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 449 | bio_integrity_advance(bio, offset << 9); |
| 450 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 451 | } |
| 452 | EXPORT_SYMBOL(bio_integrity_trim); |
| 453 | |
| 454 | /** |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 455 | * bio_integrity_clone - Callback for cloning bios with integrity metadata |
| 456 | * @bio: New bio |
| 457 | * @bio_src: Original bio |
un'ichi Nomura | 8709269 | 2009-03-09 10:40:52 +0100 | [diff] [blame] | 458 | * @gfp_mask: Memory allocation mask |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 459 | * |
| 460 | * Description: Called to allocate a bip when cloning a bio |
| 461 | */ |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 462 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 463 | gfp_t gfp_mask) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 464 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 465 | struct bio_integrity_payload *bip_src = bio_integrity(bio_src); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 466 | struct bio_integrity_payload *bip; |
| 467 | |
| 468 | BUG_ON(bip_src == NULL); |
| 469 | |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 470 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
Dan Carpenter | 7b6c0f8 | 2015-12-09 13:21:23 +0300 | [diff] [blame] | 471 | if (IS_ERR(bip)) |
| 472 | return PTR_ERR(bip); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 473 | |
| 474 | memcpy(bip->bip_vec, bip_src->bip_vec, |
| 475 | bip_src->bip_vcnt * sizeof(struct bio_vec)); |
| 476 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 477 | bip->bip_vcnt = bip_src->bip_vcnt; |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 478 | bip->bip_iter = bip_src->bip_iter; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 479 | |
| 480 | return 0; |
| 481 | } |
| 482 | EXPORT_SYMBOL(bio_integrity_clone); |
| 483 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 484 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 485 | { |
Martin K. Petersen | a91a278 | 2011-03-17 11:11:05 +0100 | [diff] [blame] | 486 | if (bs->bio_integrity_pool) |
| 487 | return 0; |
| 488 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 489 | bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab); |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 490 | if (!bs->bio_integrity_pool) |
| 491 | return -1; |
Martin K. Petersen | 6d2a78e | 2009-03-10 08:27:39 +0100 | [diff] [blame] | 492 | |
Fabian Frederick | a6c39cb4f | 2014-04-22 15:09:05 -0600 | [diff] [blame] | 493 | bs->bvec_integrity_pool = biovec_create_pool(pool_size); |
Gu Zheng | bc5c8f0 | 2013-09-11 14:23:21 -0700 | [diff] [blame] | 494 | if (!bs->bvec_integrity_pool) { |
| 495 | mempool_destroy(bs->bio_integrity_pool); |
| 496 | return -1; |
| 497 | } |
| 498 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 499 | return 0; |
| 500 | } |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 501 | EXPORT_SYMBOL(bioset_integrity_create); |
| 502 | |
| 503 | void bioset_integrity_free(struct bio_set *bs) |
| 504 | { |
| 505 | if (bs->bio_integrity_pool) |
| 506 | mempool_destroy(bs->bio_integrity_pool); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 507 | |
| 508 | if (bs->bvec_integrity_pool) |
Bjorn Helgaas | adbe699 | 2013-05-29 16:29:55 -0600 | [diff] [blame] | 509 | mempool_destroy(bs->bvec_integrity_pool); |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 510 | } |
| 511 | EXPORT_SYMBOL(bioset_integrity_free); |
| 512 | |
| 513 | void __init bio_integrity_init(void) |
| 514 | { |
Tejun Heo | a6e8dc4 | 2011-01-03 15:01:48 +0100 | [diff] [blame] | 515 | /* |
| 516 | * kintegrityd won't block much but may burn a lot of CPU cycles. |
| 517 | * Make it highpri CPU intensive wq with max concurrency of 1. |
| 518 | */ |
| 519 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | |
| 520 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 521 | if (!kintegrityd_wq) |
| 522 | panic("Failed to create kintegrityd\n"); |
| 523 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 524 | bip_slab = kmem_cache_create("bio_integrity_payload", |
| 525 | sizeof(struct bio_integrity_payload) + |
| 526 | sizeof(struct bio_vec) * BIP_INLINE_VECS, |
| 527 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 528 | } |