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> |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 29 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 30 | #define BIP_INLINE_VECS 4 |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 31 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 32 | static struct kmem_cache *bip_slab; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 33 | static struct workqueue_struct *kintegrityd_wq; |
| 34 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 35 | /** |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 36 | * bio_integrity_alloc - Allocate integrity payload and attach it to bio |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 37 | * @bio: bio to attach integrity metadata to |
| 38 | * @gfp_mask: Memory allocation mask |
| 39 | * @nr_vecs: Number of integrity metadata scatter-gather elements |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 40 | * |
| 41 | * Description: This function prepares a bio for attaching integrity |
| 42 | * metadata. nr_vecs specifies the maximum number of pages containing |
| 43 | * integrity metadata that can be attached. |
| 44 | */ |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 45 | struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, |
| 46 | gfp_t gfp_mask, |
| 47 | unsigned int nr_vecs) |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 48 | { |
| 49 | struct bio_integrity_payload *bip; |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 50 | struct bio_set *bs = bio->bi_pool; |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 51 | unsigned long idx = BIO_POOL_NONE; |
| 52 | unsigned inline_vecs; |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 53 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 54 | if (!bs) { |
| 55 | bip = kmalloc(sizeof(struct bio_integrity_payload) + |
| 56 | sizeof(struct bio_vec) * nr_vecs, gfp_mask); |
| 57 | inline_vecs = nr_vecs; |
| 58 | } else { |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 59 | bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 60 | inline_vecs = BIP_INLINE_VECS; |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 61 | } |
| 62 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 63 | if (unlikely(!bip)) |
| 64 | return NULL; |
| 65 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 66 | memset(bip, 0, sizeof(*bip)); |
| 67 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 68 | if (nr_vecs > inline_vecs) { |
| 69 | bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx, |
| 70 | bs->bvec_integrity_pool); |
| 71 | if (!bip->bip_vec) |
| 72 | goto err; |
Gu Zheng | cbcd1054 | 2014-07-01 10:36:47 -0600 | [diff] [blame] | 73 | bip->bip_max_vcnt = bvec_nr_vecs(idx); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 74 | } else { |
| 75 | bip->bip_vec = bip->bip_inline_vecs; |
Gu Zheng | cbcd1054 | 2014-07-01 10:36:47 -0600 | [diff] [blame] | 76 | bip->bip_max_vcnt = inline_vecs; |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 77 | } |
| 78 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 79 | bip->bip_slab = idx; |
| 80 | bip->bip_bio = bio; |
| 81 | bio->bi_integrity = bip; |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 82 | bio->bi_rw |= REQ_INTEGRITY; |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 83 | |
| 84 | return bip; |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 85 | err: |
| 86 | mempool_free(bip, bs->bio_integrity_pool); |
| 87 | return NULL; |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 88 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 89 | EXPORT_SYMBOL(bio_integrity_alloc); |
| 90 | |
| 91 | /** |
| 92 | * bio_integrity_free - Free bio integrity payload |
| 93 | * @bio: bio containing bip to be freed |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 94 | * |
| 95 | * Description: Used to free the integrity portion of a bio. Usually |
| 96 | * called from bio_free(). |
| 97 | */ |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 98 | void bio_integrity_free(struct bio *bio) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 99 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 100 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 101 | struct bio_set *bs = bio->bi_pool; |
| 102 | |
Martin K. Petersen | b1f013885 | 2014-09-26 19:20:04 -0400 | [diff] [blame^] | 103 | if (bip->bip_flags & BIP_BLOCK_INTEGRITY) |
Martin K. Petersen | 5f9378f | 2014-09-26 19:19:58 -0400 | [diff] [blame] | 104 | kfree(page_address(bip->bip_vec->bv_page) + |
| 105 | bip->bip_vec->bv_offset); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 106 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 107 | if (bs) { |
| 108 | if (bip->bip_slab != BIO_POOL_NONE) |
| 109 | bvec_free(bs->bvec_integrity_pool, bip->bip_vec, |
| 110 | bip->bip_slab); |
| 111 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 112 | mempool_free(bip, bs->bio_integrity_pool); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 113 | } else { |
| 114 | kfree(bip); |
| 115 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 116 | |
| 117 | bio->bi_integrity = NULL; |
| 118 | } |
| 119 | EXPORT_SYMBOL(bio_integrity_free); |
| 120 | |
| 121 | /** |
| 122 | * bio_integrity_add_page - Attach integrity metadata |
| 123 | * @bio: bio to update |
| 124 | * @page: page containing integrity metadata |
| 125 | * @len: number of bytes of integrity metadata in page |
| 126 | * @offset: start offset within page |
| 127 | * |
| 128 | * Description: Attach a page containing integrity metadata to bio. |
| 129 | */ |
| 130 | int bio_integrity_add_page(struct bio *bio, struct page *page, |
| 131 | unsigned int len, unsigned int offset) |
| 132 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 133 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 134 | struct bio_vec *iv; |
| 135 | |
Gu Zheng | cbcd1054 | 2014-07-01 10:36:47 -0600 | [diff] [blame] | 136 | if (bip->bip_vcnt >= bip->bip_max_vcnt) { |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 137 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
| 138 | return 0; |
| 139 | } |
| 140 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 141 | iv = bip->bip_vec + bip->bip_vcnt; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 142 | |
| 143 | iv->bv_page = page; |
| 144 | iv->bv_len = len; |
| 145 | iv->bv_offset = offset; |
| 146 | bip->bip_vcnt++; |
| 147 | |
| 148 | return len; |
| 149 | } |
| 150 | EXPORT_SYMBOL(bio_integrity_add_page); |
| 151 | |
| 152 | /** |
| 153 | * bio_integrity_enabled - Check whether integrity can be passed |
| 154 | * @bio: bio to check |
| 155 | * |
| 156 | * Description: Determines whether bio_integrity_prep() can be called |
| 157 | * on this bio or not. bio data direction and target device must be |
| 158 | * set prior to calling. The functions honors the write_generate and |
| 159 | * read_verify flags in sysfs. |
| 160 | */ |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 161 | bool bio_integrity_enabled(struct bio *bio) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 162 | { |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 163 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
| 164 | |
Martin K. Petersen | e69f18f | 2014-04-08 22:59:31 -0400 | [diff] [blame] | 165 | if (!bio_is_rw(bio)) |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 166 | return false; |
Martin K. Petersen | e69f18f | 2014-04-08 22:59:31 -0400 | [diff] [blame] | 167 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 168 | /* Already protected? */ |
| 169 | if (bio_integrity(bio)) |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 170 | return false; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 171 | |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 172 | if (bi == NULL) |
| 173 | return false; |
| 174 | |
| 175 | if (bio_data_dir(bio) == READ && bi->verify_fn != NULL && |
Martin K. Petersen | 8288f49 | 2014-09-26 19:20:02 -0400 | [diff] [blame] | 176 | (bi->flags & BLK_INTEGRITY_VERIFY)) |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 177 | return true; |
| 178 | |
| 179 | if (bio_data_dir(bio) == WRITE && bi->generate_fn != NULL && |
Martin K. Petersen | 8288f49 | 2014-09-26 19:20:02 -0400 | [diff] [blame] | 180 | (bi->flags & BLK_INTEGRITY_GENERATE)) |
Martin K. Petersen | e7258c1 | 2014-09-26 19:19:55 -0400 | [diff] [blame] | 181 | return true; |
| 182 | |
| 183 | return false; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 184 | } |
| 185 | EXPORT_SYMBOL(bio_integrity_enabled); |
| 186 | |
| 187 | /** |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 188 | * bio_integrity_intervals - Return number of integrity intervals for a bio |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 189 | * @bi: blk_integrity profile for device |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 190 | * @sectors: Size of the bio in 512-byte sectors |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 191 | * |
| 192 | * Description: The block layer calculates everything in 512 byte |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 193 | * sectors but integrity metadata is done in terms of the data integrity |
| 194 | * interval size of the storage device. Convert the block layer sectors |
| 195 | * to the appropriate number of integrity intervals. |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 196 | */ |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 197 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
| 198 | unsigned int sectors) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 199 | { |
Martin K. Petersen | 5a2aa87 | 2014-09-26 19:20:00 -0400 | [diff] [blame] | 200 | return sectors >> (ilog2(bi->interval) - 9); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 201 | } |
| 202 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 203 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, |
| 204 | unsigned int sectors) |
| 205 | { |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 206 | return bio_integrity_intervals(bi, sectors) * bi->tuple_size; |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 207 | } |
| 208 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 209 | /** |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 210 | * bio_integrity_process - Process integrity metadata for a bio |
Gu Zheng | bf36f9c | 2014-02-21 18:10:59 +0800 | [diff] [blame] | 211 | * @bio: bio to generate/verify integrity metadata for |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 212 | * @proc_fn: Pointer to the relevant processing function |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 213 | */ |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 214 | static int bio_integrity_process(struct bio *bio, |
| 215 | integrity_processing_fn *proc_fn) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 216 | { |
| 217 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 218 | struct blk_integrity_iter iter; |
Martin K. Petersen | 0bc6997 | 2014-04-08 22:43:44 -0400 | [diff] [blame] | 219 | struct bio_vec *bv; |
Martin K. Petersen | 5f9378f | 2014-09-26 19:19:58 -0400 | [diff] [blame] | 220 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 221 | unsigned int i, ret = 0; |
Martin K. Petersen | 5f9378f | 2014-09-26 19:19:58 -0400 | [diff] [blame] | 222 | void *prot_buf = page_address(bip->bip_vec->bv_page) + |
| 223 | bip->bip_vec->bv_offset; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 224 | |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 225 | iter.disk_name = bio->bi_bdev->bd_disk->disk_name; |
| 226 | iter.interval = bi->interval; |
| 227 | iter.seed = bip_get_seed(bip); |
| 228 | iter.prot_buf = prot_buf; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 229 | |
Martin K. Petersen | 0bc6997 | 2014-04-08 22:43:44 -0400 | [diff] [blame] | 230 | bio_for_each_segment_all(bv, bio, i) { |
| 231 | void *kaddr = kmap_atomic(bv->bv_page); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 232 | |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 233 | iter.data_buf = kaddr + bv->bv_offset; |
| 234 | iter.data_size = bv->bv_len; |
| 235 | |
| 236 | ret = proc_fn(&iter); |
| 237 | if (ret) { |
| 238 | kunmap_atomic(kaddr); |
| 239 | return ret; |
Gu Zheng | bf36f9c | 2014-02-21 18:10:59 +0800 | [diff] [blame] | 240 | } |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 241 | |
Cong Wang | e8e3c3d | 2011-11-25 23:14:27 +0800 | [diff] [blame] | 242 | kunmap_atomic(kaddr); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 243 | } |
Gu Zheng | bf36f9c | 2014-02-21 18:10:59 +0800 | [diff] [blame] | 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | /** |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 248 | * bio_integrity_prep - Prepare bio for integrity I/O |
| 249 | * @bio: bio to prepare |
| 250 | * |
| 251 | * Description: Allocates a buffer for integrity metadata, maps the |
| 252 | * pages and attaches them to a bio. The bio must have data |
| 253 | * direction, target device and start sector set priot to calling. In |
| 254 | * the WRITE case, integrity metadata will be generated using the |
| 255 | * block device's integrity function. In the READ case, the buffer |
| 256 | * will be prepared for DMA and a suitable end_io handler set up. |
| 257 | */ |
| 258 | int bio_integrity_prep(struct bio *bio) |
| 259 | { |
| 260 | struct bio_integrity_payload *bip; |
| 261 | struct blk_integrity *bi; |
| 262 | struct request_queue *q; |
| 263 | void *buf; |
| 264 | unsigned long start, end; |
| 265 | unsigned int len, nr_pages; |
| 266 | unsigned int bytes, offset, i; |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 267 | unsigned int intervals; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 268 | |
| 269 | bi = bdev_get_integrity(bio->bi_bdev); |
| 270 | q = bdev_get_queue(bio->bi_bdev); |
| 271 | BUG_ON(bi == NULL); |
| 272 | BUG_ON(bio_integrity(bio)); |
| 273 | |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 274 | intervals = bio_integrity_intervals(bi, bio_sectors(bio)); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 275 | |
| 276 | /* Allocate kernel buffer for protection data */ |
Martin K. Petersen | 3be91c4 | 2014-09-26 19:19:59 -0400 | [diff] [blame] | 277 | len = intervals * bi->tuple_size; |
David Rientjes | 72f4650 | 2010-08-23 13:35:09 +0200 | [diff] [blame] | 278 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 279 | if (unlikely(buf == NULL)) { |
| 280 | printk(KERN_ERR "could not allocate integrity buffer\n"); |
Andrew Morton | 220eb7f | 2010-08-23 13:36:20 +0200 | [diff] [blame] | 281 | return -ENOMEM; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 285 | start = ((unsigned long) buf) >> PAGE_SHIFT; |
| 286 | nr_pages = end - start; |
| 287 | |
| 288 | /* Allocate bio integrity payload and integrity vectors */ |
| 289 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); |
| 290 | if (unlikely(bip == NULL)) { |
| 291 | printk(KERN_ERR "could not allocate data integrity bioset\n"); |
| 292 | kfree(buf); |
| 293 | return -EIO; |
| 294 | } |
| 295 | |
Martin K. Petersen | b1f013885 | 2014-09-26 19:20:04 -0400 | [diff] [blame^] | 296 | bip->bip_flags |= BIP_BLOCK_INTEGRITY; |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 297 | bip->bip_iter.bi_size = len; |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 298 | bip_set_seed(bip, bio->bi_iter.bi_sector); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 299 | |
| 300 | /* Map it */ |
| 301 | offset = offset_in_page(buf); |
| 302 | for (i = 0 ; i < nr_pages ; i++) { |
| 303 | int ret; |
| 304 | bytes = PAGE_SIZE - offset; |
| 305 | |
| 306 | if (len <= 0) |
| 307 | break; |
| 308 | |
| 309 | if (bytes > len) |
| 310 | bytes = len; |
| 311 | |
| 312 | ret = bio_integrity_add_page(bio, virt_to_page(buf), |
| 313 | bytes, offset); |
| 314 | |
| 315 | if (ret == 0) |
| 316 | return 0; |
| 317 | |
| 318 | if (ret < bytes) |
| 319 | break; |
| 320 | |
| 321 | buf += bytes; |
| 322 | len -= bytes; |
| 323 | offset = 0; |
| 324 | } |
| 325 | |
| 326 | /* Install custom I/O completion handler if read verify is enabled */ |
| 327 | if (bio_data_dir(bio) == READ) { |
| 328 | bip->bip_end_io = bio->bi_end_io; |
| 329 | bio->bi_end_io = bio_integrity_endio; |
| 330 | } |
| 331 | |
| 332 | /* Auto-generate integrity metadata if this is a write */ |
| 333 | if (bio_data_dir(bio) == WRITE) |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 334 | bio_integrity_process(bio, bi->generate_fn); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 335 | |
| 336 | return 0; |
| 337 | } |
| 338 | EXPORT_SYMBOL(bio_integrity_prep); |
| 339 | |
| 340 | /** |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 341 | * bio_integrity_verify_fn - Integrity I/O completion worker |
| 342 | * @work: Work struct stored in bio to be verified |
| 343 | * |
| 344 | * Description: This workqueue function is called to complete a READ |
| 345 | * request. The function verifies the transferred integrity metadata |
| 346 | * and then calls the original bio end_io function. |
| 347 | */ |
| 348 | static void bio_integrity_verify_fn(struct work_struct *work) |
| 349 | { |
Jens Axboe | b984679 | 2008-06-17 19:05:48 +0200 | [diff] [blame] | 350 | struct bio_integrity_payload *bip = |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 351 | container_of(work, struct bio_integrity_payload, bip_work); |
| 352 | struct bio *bio = bip->bip_bio; |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 353 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
Martin K. Petersen | 7b24fc4 | 2009-01-04 02:43:38 -0500 | [diff] [blame] | 354 | int error; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 355 | |
Martin K. Petersen | 1859308 | 2014-09-26 19:20:01 -0400 | [diff] [blame] | 356 | error = bio_integrity_process(bio, bi->verify_fn); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 357 | |
| 358 | /* Restore original bio completion handler */ |
| 359 | bio->bi_end_io = bip->bip_end_io; |
Kent Overstreet | 196d38b | 2013-11-23 18:34:15 -0800 | [diff] [blame] | 360 | bio_endio_nodec(bio, error); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 361 | } |
| 362 | |
| 363 | /** |
| 364 | * bio_integrity_endio - Integrity I/O completion function |
| 365 | * @bio: Protected bio |
| 366 | * @error: Pointer to errno |
| 367 | * |
| 368 | * Description: Completion for integrity I/O |
| 369 | * |
| 370 | * Normally I/O completion is done in interrupt context. However, |
| 371 | * verifying I/O integrity is a time-consuming task which must be run |
| 372 | * in process context. This function postpones completion |
| 373 | * accordingly. |
| 374 | */ |
| 375 | void bio_integrity_endio(struct bio *bio, int error) |
| 376 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 377 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 378 | |
| 379 | BUG_ON(bip->bip_bio != bio); |
| 380 | |
Martin K. Petersen | 7b24fc4 | 2009-01-04 02:43:38 -0500 | [diff] [blame] | 381 | /* In case of an I/O error there is no point in verifying the |
| 382 | * integrity metadata. Restore original bio end_io handler |
| 383 | * and run it. |
| 384 | */ |
| 385 | if (error) { |
| 386 | bio->bi_end_io = bip->bip_end_io; |
Sagi Grimberg | 16f408d | 2014-08-13 14:49:31 +0300 | [diff] [blame] | 387 | bio_endio_nodec(bio, error); |
Martin K. Petersen | 7b24fc4 | 2009-01-04 02:43:38 -0500 | [diff] [blame] | 388 | |
| 389 | return; |
| 390 | } |
| 391 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 392 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
| 393 | queue_work(kintegrityd_wq, &bip->bip_work); |
| 394 | } |
| 395 | EXPORT_SYMBOL(bio_integrity_endio); |
| 396 | |
| 397 | /** |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 398 | * bio_integrity_advance - Advance integrity vector |
| 399 | * @bio: bio whose integrity vector to update |
| 400 | * @bytes_done: number of data bytes that have been completed |
| 401 | * |
| 402 | * Description: This function calculates how many integrity bytes the |
| 403 | * number of completed data bytes correspond to and advances the |
| 404 | * integrity vector accordingly. |
| 405 | */ |
| 406 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) |
| 407 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 408 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 409 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 410 | unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 411 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 412 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 413 | } |
| 414 | EXPORT_SYMBOL(bio_integrity_advance); |
| 415 | |
| 416 | /** |
| 417 | * bio_integrity_trim - Trim integrity vector |
| 418 | * @bio: bio whose integrity vector to update |
| 419 | * @offset: offset to first data sector |
| 420 | * @sectors: number of data sectors |
| 421 | * |
| 422 | * Description: Used to trim the integrity vector in a cloned bio. |
| 423 | * The ivec will be advanced corresponding to 'offset' data sectors |
| 424 | * and the length will be truncated corresponding to 'len' data |
| 425 | * sectors. |
| 426 | */ |
Jens Axboe | b984679 | 2008-06-17 19:05:48 +0200 | [diff] [blame] | 427 | void bio_integrity_trim(struct bio *bio, unsigned int offset, |
| 428 | unsigned int sectors) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 429 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 430 | struct bio_integrity_payload *bip = bio_integrity(bio); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 431 | struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 432 | |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 433 | bio_integrity_advance(bio, offset << 9); |
| 434 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 435 | } |
| 436 | EXPORT_SYMBOL(bio_integrity_trim); |
| 437 | |
| 438 | /** |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 439 | * bio_integrity_clone - Callback for cloning bios with integrity metadata |
| 440 | * @bio: New bio |
| 441 | * @bio_src: Original bio |
un'ichi Nomura | 8709269 | 2009-03-09 10:40:52 +0100 | [diff] [blame] | 442 | * @gfp_mask: Memory allocation mask |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 443 | * |
| 444 | * Description: Called to allocate a bip when cloning a bio |
| 445 | */ |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 446 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 447 | gfp_t gfp_mask) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 448 | { |
Martin K. Petersen | 180b2f9 | 2014-09-26 19:19:56 -0400 | [diff] [blame] | 449 | struct bio_integrity_payload *bip_src = bio_integrity(bio_src); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 450 | struct bio_integrity_payload *bip; |
| 451 | |
| 452 | BUG_ON(bip_src == NULL); |
| 453 | |
Kent Overstreet | 1e2a410f | 2012-09-06 15:34:56 -0700 | [diff] [blame] | 454 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 455 | |
| 456 | if (bip == NULL) |
| 457 | return -EIO; |
| 458 | |
| 459 | memcpy(bip->bip_vec, bip_src->bip_vec, |
| 460 | bip_src->bip_vcnt * sizeof(struct bio_vec)); |
| 461 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 462 | bip->bip_vcnt = bip_src->bip_vcnt; |
Kent Overstreet | d57a5f7 | 2013-11-23 17:20:16 -0800 | [diff] [blame] | 463 | bip->bip_iter = bip_src->bip_iter; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 464 | |
| 465 | return 0; |
| 466 | } |
| 467 | EXPORT_SYMBOL(bio_integrity_clone); |
| 468 | |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 469 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 470 | { |
Martin K. Petersen | a91a278 | 2011-03-17 11:11:05 +0100 | [diff] [blame] | 471 | if (bs->bio_integrity_pool) |
| 472 | return 0; |
| 473 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 474 | 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] | 475 | if (!bs->bio_integrity_pool) |
| 476 | return -1; |
Martin K. Petersen | 6d2a78e | 2009-03-10 08:27:39 +0100 | [diff] [blame] | 477 | |
Fabian Frederick | a6c39cb4f | 2014-04-22 15:09:05 -0600 | [diff] [blame] | 478 | bs->bvec_integrity_pool = biovec_create_pool(pool_size); |
Gu Zheng | bc5c8f0 | 2013-09-11 14:23:21 -0700 | [diff] [blame] | 479 | if (!bs->bvec_integrity_pool) { |
| 480 | mempool_destroy(bs->bio_integrity_pool); |
| 481 | return -1; |
| 482 | } |
| 483 | |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 484 | return 0; |
| 485 | } |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 486 | EXPORT_SYMBOL(bioset_integrity_create); |
| 487 | |
| 488 | void bioset_integrity_free(struct bio_set *bs) |
| 489 | { |
| 490 | if (bs->bio_integrity_pool) |
| 491 | mempool_destroy(bs->bio_integrity_pool); |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 492 | |
| 493 | if (bs->bvec_integrity_pool) |
Bjorn Helgaas | adbe699 | 2013-05-29 16:29:55 -0600 | [diff] [blame] | 494 | mempool_destroy(bs->bvec_integrity_pool); |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 495 | } |
| 496 | EXPORT_SYMBOL(bioset_integrity_free); |
| 497 | |
| 498 | void __init bio_integrity_init(void) |
| 499 | { |
Tejun Heo | a6e8dc4 | 2011-01-03 15:01:48 +0100 | [diff] [blame] | 500 | /* |
| 501 | * kintegrityd won't block much but may burn a lot of CPU cycles. |
| 502 | * Make it highpri CPU intensive wq with max concurrency of 1. |
| 503 | */ |
| 504 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | |
| 505 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 506 | if (!kintegrityd_wq) |
| 507 | panic("Failed to create kintegrityd\n"); |
| 508 | |
Kent Overstreet | 9f060e2 | 2012-10-12 15:29:33 -0700 | [diff] [blame] | 509 | bip_slab = kmem_cache_create("bio_integrity_payload", |
| 510 | sizeof(struct bio_integrity_payload) + |
| 511 | sizeof(struct bio_vec) * BIP_INLINE_VECS, |
| 512 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); |
| 513 | if (!bip_slab) |
| 514 | panic("Failed to create slab\n"); |
Martin K. Petersen | 7878cba | 2009-06-26 15:37:49 +0200 | [diff] [blame] | 515 | } |