17ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/* 27ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio-integrity.c - bio data integrity extensions 37ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 47878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * Copyright (C) 2007, 2008, 2009 Oracle Corporation 57ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Written by: Martin K. Petersen <martin.petersen@oracle.com> 67ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 77ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * This program is free software; you can redistribute it and/or 87ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * modify it under the terms of the GNU General Public License version 97ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 2 as published by the Free Software Foundation. 107ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 117ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * This program is distributed in the hope that it will be useful, but 127ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * WITHOUT ANY WARRANTY; without even the implied warranty of 137ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 147ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * General Public License for more details. 157ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 167ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * You should have received a copy of the GNU General Public License 177ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * along with this program; see the file COPYING. If not, write to 187ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, 197ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * USA. 207ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 217ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 227ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 237ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen#include <linux/blkdev.h> 247ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen#include <linux/mempool.h> 25afeacc8c1f38b7bb93d4bc7b4ba04c2605061ef0Paul Gortmaker#include <linux/export.h> 267ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen#include <linux/bio.h> 277ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen#include <linux/workqueue.h> 285a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/slab.h> 297ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 307878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenstruct integrity_slab { 317878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen struct kmem_cache *slab; 327878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen unsigned short nr_vecs; 337878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen char name[8]; 347878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen}; 357878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 367878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen#define IS(x) { .nr_vecs = x, .name = "bip-"__stringify(x) } 377878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenstruct integrity_slab bip_slab[BIOVEC_NR_POOLS] __read_mostly = { 387878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen IS(1), IS(4), IS(16), IS(64), IS(128), IS(BIO_MAX_PAGES), 397878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen}; 407878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen#undef IS 417878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 427ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenstatic struct workqueue_struct *kintegrityd_wq; 437ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 447878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenstatic inline unsigned int vecs_to_idx(unsigned int nr) 457878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen{ 467878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen switch (nr) { 477878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen case 1: 487878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return 0; 497878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen case 2 ... 4: 507878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return 1; 517878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen case 5 ... 16: 527878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return 2; 537878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen case 17 ... 64: 547878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return 3; 557878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen case 65 ... 128: 567878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return 4; 577878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen case 129 ... BIO_MAX_PAGES: 587878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return 5; 597878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen default: 607878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen BUG(); 617878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen } 627878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen} 637878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 647878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenstatic inline int use_bip_pool(unsigned int idx) 657878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen{ 669e9432c267e4047db98b9d4fba95099c6effcef9Chuck Ebbert if (idx == BIOVEC_MAX_IDX) 677878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return 1; 687878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 697878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return 0; 707878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen} 717878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 727ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 737878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * bio_integrity_alloc_bioset - Allocate integrity payload and attach it to bio 747ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio to attach integrity metadata to 757ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @gfp_mask: Memory allocation mask 767ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @nr_vecs: Number of integrity metadata scatter-gather elements 777878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * @bs: bio_set to allocate from 787ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 797ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: This function prepares a bio for attaching integrity 807ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * metadata. nr_vecs specifies the maximum number of pages containing 817ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * integrity metadata that can be attached. 827ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 837878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenstruct bio_integrity_payload *bio_integrity_alloc_bioset(struct bio *bio, 847878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen gfp_t gfp_mask, 857878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen unsigned int nr_vecs, 867878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen struct bio_set *bs) 877ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 887ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip; 897878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen unsigned int idx = vecs_to_idx(nr_vecs); 907ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 917ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bio == NULL); 927878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen bip = NULL; 937ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 947878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen /* Lower order allocations come straight from slab */ 957878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen if (!use_bip_pool(idx)) 967878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen bip = kmem_cache_alloc(bip_slab[idx].slab, gfp_mask); 977ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 987878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen /* Use mempool if lower order alloc failed or max vecs were requested */ 997878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen if (bip == NULL) { 1009e9432c267e4047db98b9d4fba95099c6effcef9Chuck Ebbert idx = BIOVEC_MAX_IDX; /* so we free the payload properly later */ 1017878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask); 1027ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1037878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen if (unlikely(bip == NULL)) { 1047878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen printk(KERN_ERR "%s: could not alloc bip\n", __func__); 1057878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return NULL; 1067878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen } 1077ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 1087ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1097878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen memset(bip, 0, sizeof(*bip)); 1107878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 1117878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen bip->bip_slab = idx; 1127ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_bio = bio; 1137ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio->bi_integrity = bip; 1147ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1157ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return bip; 1167ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 1177878cba9f0037f5599004b03a1260b32d9050360Martin K. PetersenEXPORT_SYMBOL(bio_integrity_alloc_bioset); 1187878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 1197878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen/** 1207878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * bio_integrity_alloc - Allocate integrity payload and attach it to bio 1217878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * @bio: bio to attach integrity metadata to 1227878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * @gfp_mask: Memory allocation mask 1237878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * @nr_vecs: Number of integrity metadata scatter-gather elements 1247878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * 1257878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * Description: This function prepares a bio for attaching integrity 1267878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * metadata. nr_vecs specifies the maximum number of pages containing 1277878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * integrity metadata that can be attached. 1287878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen */ 1297878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenstruct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, 1307878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen gfp_t gfp_mask, 1317878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen unsigned int nr_vecs) 1327878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen{ 1337878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return bio_integrity_alloc_bioset(bio, gfp_mask, nr_vecs, fs_bio_set); 1347878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen} 1357ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_alloc); 1367ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1377ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 1387ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_free - Free bio integrity payload 1397ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio containing bip to be freed 1407878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * @bs: bio_set this bio was allocated from 1417ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 1427ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Used to free the integrity portion of a bio. Usually 1437ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * called from bio_free(). 1447ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 1457878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenvoid bio_integrity_free(struct bio *bio, struct bio_set *bs) 1467ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 1477ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip = bio->bi_integrity; 1487ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1497ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bip == NULL); 1507ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1517ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen /* A cloned bio doesn't own the integrity metadata */ 15274aa8c2cc010035a7eef2b4ca4d6430e0dae206aMartin K. Petersen if (!bio_flagged(bio, BIO_CLONED) && !bio_flagged(bio, BIO_FS_INTEGRITY) 15374aa8c2cc010035a7eef2b4ca4d6430e0dae206aMartin K. Petersen && bip->bip_buf != NULL) 1547ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen kfree(bip->bip_buf); 1557ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1567878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen if (use_bip_pool(bip->bip_slab)) 1577878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen mempool_free(bip, bs->bio_integrity_pool); 1587878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen else 1597878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen kmem_cache_free(bip_slab[bip->bip_slab].slab, bip); 1607ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1617ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio->bi_integrity = NULL; 1627ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 1637ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_free); 1647ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1657ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 1667ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_add_page - Attach integrity metadata 1677ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio to update 1687ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @page: page containing integrity metadata 1697ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @len: number of bytes of integrity metadata in page 1707ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @offset: start offset within page 1717ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 1727ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Attach a page containing integrity metadata to bio. 1737ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 1747ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenint bio_integrity_add_page(struct bio *bio, struct page *page, 1757ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int len, unsigned int offset) 1767ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 1777ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip = bio->bi_integrity; 1787ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_vec *iv; 1797ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1807878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen if (bip->bip_vcnt >= bvec_nr_vecs(bip->bip_slab)) { 1817ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen printk(KERN_ERR "%s: bip_vec full\n", __func__); 1827ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return 0; 1837ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 1847ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1857ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen iv = bip_vec_idx(bip, bip->bip_vcnt); 1867ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(iv == NULL); 1877ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1887ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen iv->bv_page = page; 1897ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen iv->bv_len = len; 1907ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen iv->bv_offset = offset; 1917ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_vcnt++; 1927ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1937ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return len; 1947ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 1957ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_add_page); 1967ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 1979c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboestatic int bdev_integrity_enabled(struct block_device *bdev, int rw) 1989c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe{ 1999c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe struct blk_integrity *bi = bdev_get_integrity(bdev); 2009c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe 2019c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe if (bi == NULL) 2029c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe return 0; 2039c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe 2049c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe if (rw == READ && bi->verify_fn != NULL && 2059c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe (bi->flags & INTEGRITY_FLAG_READ)) 2069c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe return 1; 2079c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe 2089c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe if (rw == WRITE && bi->generate_fn != NULL && 2099c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe (bi->flags & INTEGRITY_FLAG_WRITE)) 2109c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe return 1; 2119c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe 2129c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe return 0; 2139c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe} 2149c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe 2157ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 2167ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_enabled - Check whether integrity can be passed 2177ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio to check 2187ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 2197ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Determines whether bio_integrity_prep() can be called 2207ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * on this bio or not. bio data direction and target device must be 2217ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * set prior to calling. The functions honors the write_generate and 2227ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * read_verify flags in sysfs. 2237ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 2247ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenint bio_integrity_enabled(struct bio *bio) 2257ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 2267ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen /* Already protected? */ 2277ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (bio_integrity(bio)) 2287ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return 0; 2297ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2307ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return bdev_integrity_enabled(bio->bi_bdev, bio_data_dir(bio)); 2317ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 2327ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_enabled); 2337ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2347ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 2357ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_hw_sectors - Convert 512b sectors to hardware ditto 2367ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bi: blk_integrity profile for device 2377ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @sectors: Number of 512 sectors to convert 2387ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 2397ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: The block layer calculates everything in 512 byte 2407ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * sectors but integrity metadata is done in terms of the hardware 2417ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * sector size of the storage device. Convert the block layer sectors 2427ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * to physical sectors. 2437ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 244b984679efe1a616ec4ac919dba08286d71593900Jens Axboestatic inline unsigned int bio_integrity_hw_sectors(struct blk_integrity *bi, 245b984679efe1a616ec4ac919dba08286d71593900Jens Axboe unsigned int sectors) 2467ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 2477ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen /* At this point there are only 512b or 4096b DIF/EPP devices */ 2487ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (bi->sector_size == 4096) 2497ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return sectors >>= 3; 2507ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2517ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return sectors; 2527ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 2537ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2547ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 2557ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_tag_size - Retrieve integrity tag space 2567ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio to inspect 2577ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 2587ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Returns the maximum number of tag bytes that can be 2597ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * attached to this bio. Filesystems can use this to determine how 2607ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * much metadata to attach to an I/O. 2617ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 2627ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenunsigned int bio_integrity_tag_size(struct bio *bio) 2637ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 2647ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 2657ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2667ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bio->bi_size == 0); 2677ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2687ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return bi->tag_size * (bio->bi_size / bi->sector_size); 2697ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 2707ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_tag_size); 2717ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2727ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenint bio_integrity_tag(struct bio *bio, void *tag_buf, unsigned int len, int set) 2737ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 2747ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip = bio->bi_integrity; 2757ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 2767ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int nr_sectors; 2777ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2787ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bip->bip_buf == NULL); 2797ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2807ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (bi->tag_size == 0) 2817ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return -1; 2827ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 283b984679efe1a616ec4ac919dba08286d71593900Jens Axboe nr_sectors = bio_integrity_hw_sectors(bi, 284b984679efe1a616ec4ac919dba08286d71593900Jens Axboe DIV_ROUND_UP(len, bi->tag_size)); 2857ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2867ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (nr_sectors * bi->tuple_size > bip->bip_size) { 2877ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen printk(KERN_ERR "%s: tag too big for bio: %u > %u\n", 2887ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen __func__, nr_sectors * bi->tuple_size, bip->bip_size); 2897ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return -1; 2907ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 2917ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2927ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (set) 2937ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bi->set_tag_fn(bip->bip_buf, tag_buf, nr_sectors); 2947ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen else 2957ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bi->get_tag_fn(bip->bip_buf, tag_buf, nr_sectors); 2967ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 2977ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return 0; 2987ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 2997ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3007ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 3017ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_set_tag - Attach a tag buffer to a bio 3027ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio to attach buffer to 3037ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @tag_buf: Pointer to a buffer containing tag data 3047ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @len: Length of the included buffer 3057ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 3067ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Use this function to tag a bio by leveraging the extra 3077ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * space provided by devices formatted with integrity protection. The 3087ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * size of the integrity buffer must be <= to the size reported by 3097ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_tag_size(). 3107ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 3117ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenint bio_integrity_set_tag(struct bio *bio, void *tag_buf, unsigned int len) 3127ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 3137ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bio_data_dir(bio) != WRITE); 3147ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3157ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return bio_integrity_tag(bio, tag_buf, len, 1); 3167ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 3177ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_set_tag); 3187ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3197ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 3207ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_get_tag - Retrieve a tag buffer from a bio 3217ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio to retrieve buffer from 3227ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @tag_buf: Pointer to a buffer for the tag data 3237ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @len: Length of the target buffer 3247ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 3257ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Use this function to retrieve the tag buffer from a 3267ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * completed I/O. The size of the integrity buffer must be <= to the 3277ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * size reported by bio_integrity_tag_size(). 3287ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 3297ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenint bio_integrity_get_tag(struct bio *bio, void *tag_buf, unsigned int len) 3307ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 3317ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bio_data_dir(bio) != READ); 3327ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3337ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return bio_integrity_tag(bio, tag_buf, len, 0); 3347ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 3357ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_get_tag); 3367ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3377ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 3387ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_generate - Generate integrity metadata for a bio 3397ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio to generate integrity metadata for 3407ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 3417ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Generates integrity metadata for a bio by calling the 3427ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * block device's generation callback function. The bio must have a 3437ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bip attached with enough room to accommodate the generated 3447ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * integrity metadata. 3457ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 3467ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenstatic void bio_integrity_generate(struct bio *bio) 3477ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 3487ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 3497ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity_exchg bix; 3507ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_vec *bv; 3517ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen sector_t sector = bio->bi_sector; 3527ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int i, sectors, total; 3537ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen void *prot_buf = bio->bi_integrity->bip_buf; 3547ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3557ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen total = 0; 3567ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.disk_name = bio->bi_bdev->bd_disk->disk_name; 3577ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.sector_size = bi->sector_size; 3587ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3597ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio_for_each_segment(bv, bio, i) { 3607ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen void *kaddr = kmap_atomic(bv->bv_page, KM_USER0); 3617ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.data_buf = kaddr + bv->bv_offset; 3627ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.data_size = bv->bv_len; 3637ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.prot_buf = prot_buf; 3647ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.sector = sector; 3657ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3667ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bi->generate_fn(&bix); 3677ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3687ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen sectors = bv->bv_len / bi->sector_size; 3697ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen sector += sectors; 3707ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen prot_buf += sectors * bi->tuple_size; 3717ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen total += sectors * bi->tuple_size; 3727ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(total > bio->bi_integrity->bip_size); 3737ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3747ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen kunmap_atomic(kaddr, KM_USER0); 3757ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 3767ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 3777ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 3789c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboestatic inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) 3799c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe{ 3809c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe if (bi) 3819c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe return bi->tuple_size; 3829c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe 3839c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe return 0; 3849c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe} 3859c02f2b02e29a2244e36c6e1f246080d8afc6cffJens Axboe 3867ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 3877ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_prep - Prepare bio for integrity I/O 3887ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio to prepare 3897ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 3907ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Allocates a buffer for integrity metadata, maps the 3917ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * pages and attaches them to a bio. The bio must have data 3927ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * direction, target device and start sector set priot to calling. In 3937ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * the WRITE case, integrity metadata will be generated using the 3947ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * block device's integrity function. In the READ case, the buffer 3957ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * will be prepared for DMA and a suitable end_io handler set up. 3967ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 3977ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenint bio_integrity_prep(struct bio *bio) 3987ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 3997ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip; 4007ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity *bi; 4017ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct request_queue *q; 4027ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen void *buf; 4037ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned long start, end; 4047ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int len, nr_pages; 4057ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int bytes, offset, i; 4067ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int sectors; 4077ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4087ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bi = bdev_get_integrity(bio->bi_bdev); 4097ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen q = bdev_get_queue(bio->bi_bdev); 4107ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bi == NULL); 4117ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bio_integrity(bio)); 4127ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4137ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen sectors = bio_integrity_hw_sectors(bi, bio_sectors(bio)); 4147ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4157ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen /* Allocate kernel buffer for protection data */ 4167ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen len = sectors * blk_integrity_tuple_size(bi); 41772f465033702ebfe20db8f50edaad59f0f38b0f5David Rientjes buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); 4187ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (unlikely(buf == NULL)) { 4197ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen printk(KERN_ERR "could not allocate integrity buffer\n"); 420220eb7fd984bfc7e6b4005fdf32efe9cd8af7cf2Andrew Morton return -ENOMEM; 4217ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 4227ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4237ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; 4247ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen start = ((unsigned long) buf) >> PAGE_SHIFT; 4257ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen nr_pages = end - start; 4267ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4277ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen /* Allocate bio integrity payload and integrity vectors */ 4287ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); 4297ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (unlikely(bip == NULL)) { 4307ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen printk(KERN_ERR "could not allocate data integrity bioset\n"); 4317ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen kfree(buf); 4327ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return -EIO; 4337ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 4347ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4357ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_buf = buf; 4367ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_size = len; 4377ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_sector = bio->bi_sector; 4387ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4397ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen /* Map it */ 4407ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen offset = offset_in_page(buf); 4417ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen for (i = 0 ; i < nr_pages ; i++) { 4427ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen int ret; 4437ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bytes = PAGE_SIZE - offset; 4447ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4457ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (len <= 0) 4467ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen break; 4477ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4487ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (bytes > len) 4497ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bytes = len; 4507ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4517ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen ret = bio_integrity_add_page(bio, virt_to_page(buf), 4527ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bytes, offset); 4537ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4547ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (ret == 0) 4557ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return 0; 4567ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4577ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (ret < bytes) 4587ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen break; 4597ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4607ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen buf += bytes; 4617ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen len -= bytes; 4627ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen offset = 0; 4637ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 4647ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4657ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen /* Install custom I/O completion handler if read verify is enabled */ 4667ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (bio_data_dir(bio) == READ) { 4677ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_end_io = bio->bi_end_io; 4687ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio->bi_end_io = bio_integrity_endio; 4697ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 4707ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4717ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen /* Auto-generate integrity metadata if this is a write */ 4727ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (bio_data_dir(bio) == WRITE) 4737ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio_integrity_generate(bio); 4747ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4757ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return 0; 4767ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 4777ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_prep); 4787ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4797ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 4807ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_verify - Verify integrity metadata for a bio 4817ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio to verify 4827ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 4837ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: This function is called to verify the integrity of a 4847ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio. The data in the bio io_vec is compared to the integrity 4857ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * metadata returned by the HBA. 4867ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 4877ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenstatic int bio_integrity_verify(struct bio *bio) 4887ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 4897ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 4907ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity_exchg bix; 4917ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_vec *bv; 4927ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen sector_t sector = bio->bi_integrity->bip_sector; 4937ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int i, sectors, total, ret; 4947ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen void *prot_buf = bio->bi_integrity->bip_buf; 4957ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 4967ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen ret = total = 0; 4977ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.disk_name = bio->bi_bdev->bd_disk->disk_name; 4987ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.sector_size = bi->sector_size; 4997ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5007ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio_for_each_segment(bv, bio, i) { 5017ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen void *kaddr = kmap_atomic(bv->bv_page, KM_USER0); 5027ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.data_buf = kaddr + bv->bv_offset; 5037ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.data_size = bv->bv_len; 5047ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.prot_buf = prot_buf; 5057ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bix.sector = sector; 5067ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5077ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen ret = bi->verify_fn(&bix); 5087ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5097ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (ret) { 5107ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen kunmap_atomic(kaddr, KM_USER0); 5117b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen return ret; 5127ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 5137ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5147ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen sectors = bv->bv_len / bi->sector_size; 5157ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen sector += sectors; 5167ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen prot_buf += sectors * bi->tuple_size; 5177ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen total += sectors * bi->tuple_size; 5187ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(total > bio->bi_integrity->bip_size); 5197ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5207ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen kunmap_atomic(kaddr, KM_USER0); 5217ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 5227ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5237ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return ret; 5247ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 5257ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5267ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 5277ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_verify_fn - Integrity I/O completion worker 5287ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @work: Work struct stored in bio to be verified 5297ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 5307ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: This workqueue function is called to complete a READ 5317ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * request. The function verifies the transferred integrity metadata 5327ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * and then calls the original bio end_io function. 5337ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 5347ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenstatic void bio_integrity_verify_fn(struct work_struct *work) 5357ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 536b984679efe1a616ec4ac919dba08286d71593900Jens Axboe struct bio_integrity_payload *bip = 5377ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen container_of(work, struct bio_integrity_payload, bip_work); 5387ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio *bio = bip->bip_bio; 5397b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen int error; 5407ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5417b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen error = bio_integrity_verify(bio); 5427ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5437ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen /* Restore original bio completion handler */ 5447ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio->bi_end_io = bip->bip_end_io; 5457b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen bio_endio(bio, error); 5467ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 5477ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5487ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 5497ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_endio - Integrity I/O completion function 5507ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: Protected bio 5517ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @error: Pointer to errno 5527ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 5537ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Completion for integrity I/O 5547ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 5557ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Normally I/O completion is done in interrupt context. However, 5567ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * verifying I/O integrity is a time-consuming task which must be run 5577ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * in process context. This function postpones completion 5587ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * accordingly. 5597ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 5607ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenvoid bio_integrity_endio(struct bio *bio, int error) 5617ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 5627ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip = bio->bi_integrity; 5637ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5647ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bip->bip_bio != bio); 5657ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5667b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen /* In case of an I/O error there is no point in verifying the 5677b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen * integrity metadata. Restore original bio end_io handler 5687b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen * and run it. 5697b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen */ 5707b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen if (error) { 5717b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen bio->bi_end_io = bip->bip_end_io; 5727b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen bio_endio(bio, error); 5737b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen 5747b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen return; 5757b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen } 5767b24fc4d7eb611da367dea3aad45473050aacd6cMartin K. Petersen 5777ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); 5787ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen queue_work(kintegrityd_wq, &bip->bip_work); 5797ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 5807ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_endio); 5817ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5827ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 5837ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_mark_head - Advance bip_vec skip bytes 5847ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bip: Integrity vector to advance 5857ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @skip: Number of bytes to advance it 5867ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 587b984679efe1a616ec4ac919dba08286d71593900Jens Axboevoid bio_integrity_mark_head(struct bio_integrity_payload *bip, 588b984679efe1a616ec4ac919dba08286d71593900Jens Axboe unsigned int skip) 5897ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 5907ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_vec *iv; 5917ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int i; 5927ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 5937ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip_for_each_vec(iv, bip, i) { 5947ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (skip == 0) { 5957ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_idx = i; 5967ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return; 5977ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } else if (skip >= iv->bv_len) { 5987ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen skip -= iv->bv_len; 5997ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } else { /* skip < iv->bv_len) */ 6007ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen iv->bv_offset += skip; 6017ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen iv->bv_len -= skip; 6027ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_idx = i; 6037ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return; 6047ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 6057ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 6067ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 6077ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6087ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 6097ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_mark_tail - Truncate bip_vec to be len bytes long 6107ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bip: Integrity vector to truncate 6117ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @len: New length of integrity vector 6127ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 613b984679efe1a616ec4ac919dba08286d71593900Jens Axboevoid bio_integrity_mark_tail(struct bio_integrity_payload *bip, 614b984679efe1a616ec4ac919dba08286d71593900Jens Axboe unsigned int len) 6157ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 6167ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_vec *iv; 6177ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int i; 6187ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6197ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip_for_each_vec(iv, bip, i) { 6207ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (len == 0) { 6217ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_vcnt = i; 6227ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return; 6237ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } else if (len >= iv->bv_len) { 6247ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen len -= iv->bv_len; 6257ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } else { /* len < iv->bv_len) */ 6267ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen iv->bv_len = len; 6277ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen len = 0; 6287ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 6297ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen } 6307ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 6317ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6327ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 6337ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_advance - Advance integrity vector 6347ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio whose integrity vector to update 6357ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bytes_done: number of data bytes that have been completed 6367ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 6377ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: This function calculates how many integrity bytes the 6387ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * number of completed data bytes correspond to and advances the 6397ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * integrity vector accordingly. 6407ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 6417ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenvoid bio_integrity_advance(struct bio *bio, unsigned int bytes_done) 6427ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 6437ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip = bio->bi_integrity; 6447ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 6457ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int nr_sectors; 6467ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6477ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bip == NULL); 6487ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bi == NULL); 6497ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6507ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen nr_sectors = bio_integrity_hw_sectors(bi, bytes_done >> 9); 6517ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio_integrity_mark_head(bip, nr_sectors * bi->tuple_size); 6527ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 6537ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_advance); 6547ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6557ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 6567ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_trim - Trim integrity vector 6577ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: bio whose integrity vector to update 6587ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @offset: offset to first data sector 6597ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @sectors: number of data sectors 6607ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 6617ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Used to trim the integrity vector in a cloned bio. 6627ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * The ivec will be advanced corresponding to 'offset' data sectors 6637ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * and the length will be truncated corresponding to 'len' data 6647ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * sectors. 6657ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 666b984679efe1a616ec4ac919dba08286d71593900Jens Axboevoid bio_integrity_trim(struct bio *bio, unsigned int offset, 667b984679efe1a616ec4ac919dba08286d71593900Jens Axboe unsigned int sectors) 6687ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 6697ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip = bio->bi_integrity; 6707ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev); 6717ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int nr_sectors; 6727ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6737ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bip == NULL); 6747ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bi == NULL); 6757ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(!bio_flagged(bio, BIO_CLONED)); 6767ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6777ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen nr_sectors = bio_integrity_hw_sectors(bi, sectors); 6787ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_sector = bip->bip_sector + offset; 6797ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio_integrity_mark_head(bip, offset * bi->tuple_size); 6807ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bio_integrity_mark_tail(bip, sectors * bi->tuple_size); 6817ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 6827ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_trim); 6837ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6847ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 6857ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_split - Split integrity metadata 6867ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: Protected bio 6877ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bp: Resulting bio_pair 6887ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @sectors: Offset 6897ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 6907ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Splits an integrity page into a bio_pair. 6917ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 6927ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersenvoid bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors) 6937ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 6947ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct blk_integrity *bi; 6957ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip = bio->bi_integrity; 6967ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen unsigned int nr_sectors; 6977ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 6987ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (bio_integrity(bio) == 0) 6997ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return; 7007ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7017ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bi = bdev_get_integrity(bio->bi_bdev); 7027ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bi == NULL); 7037ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bip->bip_vcnt != 1); 7047ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7057ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen nr_sectors = bio_integrity_hw_sectors(bi, sectors); 7067ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7077ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->bio1.bi_integrity = &bp->bip1; 7087ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->bio2.bi_integrity = &bp->bip2; 7097ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7107ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->iv1 = bip->bip_vec[0]; 7117ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->iv2 = bip->bip_vec[0]; 7127ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7137878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen bp->bip1.bip_vec[0] = bp->iv1; 7147878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen bp->bip2.bip_vec[0] = bp->iv2; 7157ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7167ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->iv1.bv_len = sectors * bi->tuple_size; 7177ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->iv2.bv_offset += sectors * bi->tuple_size; 7187ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->iv2.bv_len -= sectors * bi->tuple_size; 7197ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7207ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->bip1.bip_sector = bio->bi_integrity->bip_sector; 7217ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->bip2.bip_sector = bio->bi_integrity->bip_sector + nr_sectors; 7227ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7237ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->bip1.bip_vcnt = bp->bip2.bip_vcnt = 1; 7247ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bp->bip1.bip_idx = bp->bip2.bip_idx = 0; 7257ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 7267ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_split); 7277ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7287ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen/** 7297ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * bio_integrity_clone - Callback for cloning bios with integrity metadata 7307ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio: New bio 7317ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * @bio_src: Original bio 73287092698c665e0a358caf9825ae13114343027e8un'ichi Nomura * @gfp_mask: Memory allocation mask 7337878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen * @bs: bio_set to allocate bip from 7347ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * 7357ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen * Description: Called to allocate a bip when cloning a bio 7367ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen */ 7377878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenint bio_integrity_clone(struct bio *bio, struct bio *bio_src, 7387878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen gfp_t gfp_mask, struct bio_set *bs) 7397ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 7407ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip_src = bio_src->bi_integrity; 7417ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen struct bio_integrity_payload *bip; 7427ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7437ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen BUG_ON(bip_src == NULL); 7447ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7457878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen bip = bio_integrity_alloc_bioset(bio, gfp_mask, bip_src->bip_vcnt, bs); 7467ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7477ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen if (bip == NULL) 7487ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return -EIO; 7497ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7507ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen memcpy(bip->bip_vec, bip_src->bip_vec, 7517ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip_src->bip_vcnt * sizeof(struct bio_vec)); 7527ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7537ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_sector = bip_src->bip_sector; 7547ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_vcnt = bip_src->bip_vcnt; 7557ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen bip->bip_idx = bip_src->bip_idx; 7567ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7577ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen return 0; 7587ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 7597ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. PetersenEXPORT_SYMBOL(bio_integrity_clone); 7607ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7617878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenint bioset_integrity_create(struct bio_set *bs, int pool_size) 7627ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen{ 7637878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen unsigned int max_slab = vecs_to_idx(BIO_MAX_PAGES); 7647878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 765a91a2785b200864aef2270ed6a3babac7a253a20Martin K. Petersen if (bs->bio_integrity_pool) 766a91a2785b200864aef2270ed6a3babac7a253a20Martin K. Petersen return 0; 767a91a2785b200864aef2270ed6a3babac7a253a20Martin K. Petersen 7687878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen bs->bio_integrity_pool = 7697878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen mempool_create_slab_pool(pool_size, bip_slab[max_slab].slab); 7707ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7717878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen if (!bs->bio_integrity_pool) 7727878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return -1; 7737878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 7747878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen return 0; 7757878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen} 7767878cba9f0037f5599004b03a1260b32d9050360Martin K. PetersenEXPORT_SYMBOL(bioset_integrity_create); 7777878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 7787878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenvoid bioset_integrity_free(struct bio_set *bs) 7797878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen{ 7807878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen if (bs->bio_integrity_pool) 7817878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen mempool_destroy(bs->bio_integrity_pool); 7827878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen} 7837878cba9f0037f5599004b03a1260b32d9050360Martin K. PetersenEXPORT_SYMBOL(bioset_integrity_free); 7847878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 7857878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersenvoid __init bio_integrity_init(void) 7867878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen{ 7877878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen unsigned int i; 7887878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen 789a6e8dc46ff0b7defbfa4f29a71aee263377ec573Tejun Heo /* 790a6e8dc46ff0b7defbfa4f29a71aee263377ec573Tejun Heo * kintegrityd won't block much but may burn a lot of CPU cycles. 791a6e8dc46ff0b7defbfa4f29a71aee263377ec573Tejun Heo * Make it highpri CPU intensive wq with max concurrency of 1. 792a6e8dc46ff0b7defbfa4f29a71aee263377ec573Tejun Heo */ 793a6e8dc46ff0b7defbfa4f29a71aee263377ec573Tejun Heo kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | 794a6e8dc46ff0b7defbfa4f29a71aee263377ec573Tejun Heo WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); 7956d2a78e783416ba99e36beb1d4395b785b34e867Martin K. Petersen if (!kintegrityd_wq) 7966d2a78e783416ba99e36beb1d4395b785b34e867Martin K. Petersen panic("Failed to create kintegrityd\n"); 7977ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 7987878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen for (i = 0 ; i < BIOVEC_NR_POOLS ; i++) { 7997878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen unsigned int size; 8007ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 8017878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen size = sizeof(struct bio_integrity_payload) 8027878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen + bip_slab[i].nr_vecs * sizeof(struct bio_vec); 8037ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen 8047878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen bip_slab[i].slab = 8057878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen kmem_cache_create(bip_slab[i].name, size, 0, 8067878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); 8077878cba9f0037f5599004b03a1260b32d9050360Martin K. Petersen } 8087ba1ba12eeef0aa7113beb16410ef8b7c748e18bMartin K. Petersen} 809