blob: 4707e90b8ee55fda718dcdb7ea06d6746cc4a0b6 [file] [log] [blame]
Christoph Hellwig8c165672019-04-30 14:42:39 -04001// SPDX-License-Identifier: GPL-2.0
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02002/*
3 * bio-integrity.c - bio data integrity extensions
4 *
Martin K. Petersen7878cba2009-06-26 15:37:49 +02005 * Copyright (C) 2007, 2008, 2009 Oracle Corporation
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02006 * Written by: Martin K. Petersen <martin.petersen@oracle.com>
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02007 */
8
9#include <linux/blkdev.h>
10#include <linux/mempool.h>
Paul Gortmakerafeacc82011-05-26 16:00:52 -040011#include <linux/export.h>
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020012#include <linux/bio.h>
13#include <linux/workqueue.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Bart Van Assche1179a5a2016-06-14 17:03:45 +020015#include "blk.h"
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020016
Kent Overstreet9f060e22012-10-12 15:29:33 -070017#define BIP_INLINE_VECS 4
Martin K. Petersen7878cba2009-06-26 15:37:49 +020018
Kent Overstreet9f060e22012-10-12 15:29:33 -070019static struct kmem_cache *bip_slab;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020020static struct workqueue_struct *kintegrityd_wq;
21
Dan Williams5a48fc12015-10-21 13:20:23 -040022void blk_flush_integrity(void)
23{
24 flush_workqueue(kintegrityd_wq);
25}
26
Chengguang Xu0b8eb622020-06-24 18:21:39 +080027void __bio_integrity_free(struct bio_set *bs, struct bio_integrity_payload *bip)
28{
29 if (bs && mempool_initialized(&bs->bio_integrity_pool)) {
30 if (bip->bip_vec)
31 bvec_free(&bs->bvec_integrity_pool, bip->bip_vec,
32 bip->bip_slab);
33 mempool_free(bip, &bs->bio_integrity_pool);
34 } else {
35 kfree(bip);
36 }
37}
38
Martin K. Petersen7878cba2009-06-26 15:37:49 +020039/**
Kent Overstreet1e2a410f2012-09-06 15:34:56 -070040 * bio_integrity_alloc - Allocate integrity payload and attach it to bio
Martin K. Petersen7878cba2009-06-26 15:37:49 +020041 * @bio: bio to attach integrity metadata to
42 * @gfp_mask: Memory allocation mask
43 * @nr_vecs: Number of integrity metadata scatter-gather elements
Martin K. Petersen7878cba2009-06-26 15:37:49 +020044 *
45 * Description: This function prepares a bio for attaching integrity
46 * metadata. nr_vecs specifies the maximum number of pages containing
47 * integrity metadata that can be attached.
48 */
Kent Overstreet1e2a410f2012-09-06 15:34:56 -070049struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
50 gfp_t gfp_mask,
51 unsigned int nr_vecs)
Martin K. Petersen7878cba2009-06-26 15:37:49 +020052{
53 struct bio_integrity_payload *bip;
Kent Overstreet1e2a410f2012-09-06 15:34:56 -070054 struct bio_set *bs = bio->bi_pool;
Kent Overstreet9f060e22012-10-12 15:29:33 -070055 unsigned inline_vecs;
Kent Overstreet1e2a410f2012-09-06 15:34:56 -070056
Satya Tangiralad145dc22020-05-14 00:37:19 +000057 if (WARN_ON_ONCE(bio_has_crypt_ctx(bio)))
58 return ERR_PTR(-EOPNOTSUPP);
59
Kent Overstreet8aa6ba22018-05-08 21:33:50 -040060 if (!bs || !mempool_initialized(&bs->bio_integrity_pool)) {
Jackie Liu7a102d92019-05-15 16:52:19 +080061 bip = kmalloc(struct_size(bip, bip_inline_vecs, nr_vecs), gfp_mask);
Kent Overstreet9f060e22012-10-12 15:29:33 -070062 inline_vecs = nr_vecs;
63 } else {
Kent Overstreet8aa6ba22018-05-08 21:33:50 -040064 bip = mempool_alloc(&bs->bio_integrity_pool, gfp_mask);
Kent Overstreet9f060e22012-10-12 15:29:33 -070065 inline_vecs = BIP_INLINE_VECS;
Martin K. Petersen7878cba2009-06-26 15:37:49 +020066 }
67
Kent Overstreet9f060e22012-10-12 15:29:33 -070068 if (unlikely(!bip))
Keith Busch06c1e392015-12-03 09:32:21 -070069 return ERR_PTR(-ENOMEM);
Kent Overstreet9f060e22012-10-12 15:29:33 -070070
Martin K. Petersen7878cba2009-06-26 15:37:49 +020071 memset(bip, 0, sizeof(*bip));
72
Kent Overstreet9f060e22012-10-12 15:29:33 -070073 if (nr_vecs > inline_vecs) {
Christoph Hellwiged996a52016-07-19 11:28:42 +020074 unsigned long idx = 0;
75
Kent Overstreet9f060e22012-10-12 15:29:33 -070076 bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx,
Kent Overstreet8aa6ba22018-05-08 21:33:50 -040077 &bs->bvec_integrity_pool);
Kent Overstreet9f060e22012-10-12 15:29:33 -070078 if (!bip->bip_vec)
79 goto err;
Gu Zhengcbcd10542014-07-01 10:36:47 -060080 bip->bip_max_vcnt = bvec_nr_vecs(idx);
Christoph Hellwiged996a52016-07-19 11:28:42 +020081 bip->bip_slab = idx;
Kent Overstreet9f060e22012-10-12 15:29:33 -070082 } else {
83 bip->bip_vec = bip->bip_inline_vecs;
Gu Zhengcbcd10542014-07-01 10:36:47 -060084 bip->bip_max_vcnt = inline_vecs;
Kent Overstreet9f060e22012-10-12 15:29:33 -070085 }
86
Martin K. Petersen7878cba2009-06-26 15:37:49 +020087 bip->bip_bio = bio;
88 bio->bi_integrity = bip;
Jens Axboe1eff9d32016-08-05 15:35:16 -060089 bio->bi_opf |= REQ_INTEGRITY;
Martin K. Petersen7878cba2009-06-26 15:37:49 +020090
91 return bip;
Kent Overstreet9f060e22012-10-12 15:29:33 -070092err:
Chengguang Xu0b8eb622020-06-24 18:21:39 +080093 __bio_integrity_free(bs, bip);
Keith Busch06c1e392015-12-03 09:32:21 -070094 return ERR_PTR(-ENOMEM);
Martin K. Petersen7878cba2009-06-26 15:37:49 +020095}
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020096EXPORT_SYMBOL(bio_integrity_alloc);
97
98/**
99 * bio_integrity_free - Free bio integrity payload
100 * @bio: bio containing bip to be freed
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200101 *
102 * Description: Used to free the integrity portion of a bio. Usually
103 * called from bio_free().
104 */
Justin Teeece841a2019-12-05 10:09:01 +0800105void bio_integrity_free(struct bio *bio)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200106{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400107 struct bio_integrity_payload *bip = bio_integrity(bio);
Kent Overstreet1e2a410f2012-09-06 15:34:56 -0700108 struct bio_set *bs = bio->bi_pool;
109
Martin K. Petersenb1f0138852014-09-26 19:20:04 -0400110 if (bip->bip_flags & BIP_BLOCK_INTEGRITY)
Martin K. Petersen5f9378f2014-09-26 19:19:58 -0400111 kfree(page_address(bip->bip_vec->bv_page) +
112 bip->bip_vec->bv_offset);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200113
Chengguang Xu0b8eb622020-06-24 18:21:39 +0800114 __bio_integrity_free(bs, bip);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200115 bio->bi_integrity = NULL;
Christoph Hellwig7c20f112017-07-03 16:58:43 -0600116 bio->bi_opf &= ~REQ_INTEGRITY;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200117}
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200118
119/**
120 * bio_integrity_add_page - Attach integrity metadata
121 * @bio: bio to update
122 * @page: page containing integrity metadata
123 * @len: number of bytes of integrity metadata in page
124 * @offset: start offset within page
125 *
126 * Description: Attach a page containing integrity metadata to bio.
127 */
128int bio_integrity_add_page(struct bio *bio, struct page *page,
129 unsigned int len, unsigned int offset)
130{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400131 struct bio_integrity_payload *bip = bio_integrity(bio);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200132 struct bio_vec *iv;
133
Gu Zhengcbcd10542014-07-01 10:36:47 -0600134 if (bip->bip_vcnt >= bip->bip_max_vcnt) {
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200135 printk(KERN_ERR "%s: bip_vec full\n", __func__);
136 return 0;
137 }
138
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800139 iv = bip->bip_vec + bip->bip_vcnt;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200140
Sagi Grimberg87a816d2015-09-08 09:33:35 -0600141 if (bip->bip_vcnt &&
Christoph Hellwig74d46992017-08-23 19:10:32 +0200142 bvec_gap_to_prev(bio->bi_disk->queue,
Sagi Grimberg87a816d2015-09-08 09:33:35 -0600143 &bip->bip_vec[bip->bip_vcnt - 1], offset))
144 return 0;
145
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200146 iv->bv_page = page;
147 iv->bv_len = len;
148 iv->bv_offset = offset;
149 bip->bip_vcnt++;
150
151 return len;
152}
153EXPORT_SYMBOL(bio_integrity_add_page);
154
155/**
Martin K. Petersen18593082014-09-26 19:20:01 -0400156 * bio_integrity_process - Process integrity metadata for a bio
Gu Zhengbf36f9c2014-02-21 18:10:59 +0800157 * @bio: bio to generate/verify integrity metadata for
Dmitry Monakhov63573e32017-06-29 11:31:15 -0700158 * @proc_iter: iterator to process
Martin K. Petersen18593082014-09-26 19:20:01 -0400159 * @proc_fn: Pointer to the relevant processing function
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200160 */
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200161static blk_status_t bio_integrity_process(struct bio *bio,
Dmitry Monakhov63573e32017-06-29 11:31:15 -0700162 struct bvec_iter *proc_iter, integrity_processing_fn *proc_fn)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200163{
Christoph Hellwig74d46992017-08-23 19:10:32 +0200164 struct blk_integrity *bi = blk_get_integrity(bio->bi_disk);
Martin K. Petersen18593082014-09-26 19:20:01 -0400165 struct blk_integrity_iter iter;
Darrick J. Wong594416a2014-11-25 17:40:25 -0800166 struct bvec_iter bviter;
167 struct bio_vec bv;
Martin K. Petersen5f9378f2014-09-26 19:19:58 -0400168 struct bio_integrity_payload *bip = bio_integrity(bio);
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200169 blk_status_t ret = BLK_STS_OK;
Martin K. Petersen5f9378f2014-09-26 19:19:58 -0400170 void *prot_buf = page_address(bip->bip_vec->bv_page) +
171 bip->bip_vec->bv_offset;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200172
Christoph Hellwig74d46992017-08-23 19:10:32 +0200173 iter.disk_name = bio->bi_disk->disk_name;
Martin K. Petersena48f0412015-10-21 13:19:38 -0400174 iter.interval = 1 << bi->interval_exp;
Dmitry Monakhov63573e32017-06-29 11:31:15 -0700175 iter.seed = proc_iter->bi_sector;
Martin K. Petersen18593082014-09-26 19:20:01 -0400176 iter.prot_buf = prot_buf;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200177
Dmitry Monakhov63573e32017-06-29 11:31:15 -0700178 __bio_for_each_segment(bv, bio, bviter, *proc_iter) {
Darrick J. Wong594416a2014-11-25 17:40:25 -0800179 void *kaddr = kmap_atomic(bv.bv_page);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200180
Darrick J. Wong594416a2014-11-25 17:40:25 -0800181 iter.data_buf = kaddr + bv.bv_offset;
182 iter.data_size = bv.bv_len;
Martin K. Petersen18593082014-09-26 19:20:01 -0400183
184 ret = proc_fn(&iter);
185 if (ret) {
186 kunmap_atomic(kaddr);
187 return ret;
Gu Zhengbf36f9c2014-02-21 18:10:59 +0800188 }
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200189
Cong Wange8e3c3d2011-11-25 23:14:27 +0800190 kunmap_atomic(kaddr);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200191 }
Gu Zhengbf36f9c2014-02-21 18:10:59 +0800192 return ret;
193}
194
195/**
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200196 * bio_integrity_prep - Prepare bio for integrity I/O
197 * @bio: bio to prepare
198 *
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700199 * Description: Checks if the bio already has an integrity payload attached.
200 * If it does, the payload has been generated by another kernel subsystem,
201 * and we just pass it through. Otherwise allocates integrity payload.
202 * The bio must have data direction, target device and start sector set priot
203 * to calling. In the WRITE case, integrity metadata will be generated using
204 * the block device's integrity function. In the READ case, the buffer
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200205 * will be prepared for DMA and a suitable end_io handler set up.
206 */
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700207bool bio_integrity_prep(struct bio *bio)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200208{
209 struct bio_integrity_payload *bip;
Christoph Hellwig74d46992017-08-23 19:10:32 +0200210 struct blk_integrity *bi = blk_get_integrity(bio->bi_disk);
211 struct request_queue *q = bio->bi_disk->queue;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200212 void *buf;
213 unsigned long start, end;
214 unsigned int len, nr_pages;
215 unsigned int bytes, offset, i;
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400216 unsigned int intervals;
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700217 blk_status_t status;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200218
Christoph Hellwig9346beb2017-08-09 17:48:08 +0200219 if (!bi)
220 return true;
221
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700222 if (bio_op(bio) != REQ_OP_READ && bio_op(bio) != REQ_OP_WRITE)
223 return true;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200224
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700225 if (!bio_sectors(bio))
226 return true;
227
228 /* Already protected? */
229 if (bio_integrity(bio))
230 return true;
231
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700232 if (bio_data_dir(bio) == READ) {
233 if (!bi->profile->verify_fn ||
234 !(bi->flags & BLK_INTEGRITY_VERIFY))
235 return true;
236 } else {
237 if (!bi->profile->generate_fn ||
238 !(bi->flags & BLK_INTEGRITY_GENERATE))
239 return true;
240 }
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400241 intervals = bio_integrity_intervals(bi, bio_sectors(bio));
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200242
243 /* Allocate kernel buffer for protection data */
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400244 len = intervals * bi->tuple_size;
David Rientjes72f46502010-08-23 13:35:09 +0200245 buf = kmalloc(len, GFP_NOIO | q->bounce_gfp);
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700246 status = BLK_STS_RESOURCE;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200247 if (unlikely(buf == NULL)) {
248 printk(KERN_ERR "could not allocate integrity buffer\n");
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700249 goto err_end_io;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200250 }
251
252 end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
253 start = ((unsigned long) buf) >> PAGE_SHIFT;
254 nr_pages = end - start;
255
256 /* Allocate bio integrity payload and integrity vectors */
257 bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages);
Dan Carpenter7b6c0f82015-12-09 13:21:23 +0300258 if (IS_ERR(bip)) {
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200259 printk(KERN_ERR "could not allocate data integrity bioset\n");
260 kfree(buf);
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700261 status = BLK_STS_RESOURCE;
262 goto err_end_io;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200263 }
264
Martin K. Petersenb1f0138852014-09-26 19:20:04 -0400265 bip->bip_flags |= BIP_BLOCK_INTEGRITY;
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800266 bip->bip_iter.bi_size = len;
Martin K. Petersen18593082014-09-26 19:20:01 -0400267 bip_set_seed(bip, bio->bi_iter.bi_sector);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200268
Martin K. Petersenaae7df52014-09-26 19:20:05 -0400269 if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM)
270 bip->bip_flags |= BIP_IP_CHECKSUM;
271
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200272 /* Map it */
273 offset = offset_in_page(buf);
274 for (i = 0 ; i < nr_pages ; i++) {
275 int ret;
276 bytes = PAGE_SIZE - offset;
277
278 if (len <= 0)
279 break;
280
281 if (bytes > len)
282 bytes = len;
283
284 ret = bio_integrity_add_page(bio, virt_to_page(buf),
285 bytes, offset);
286
Wenwen Wange7bf90e2019-07-11 14:22:02 -0500287 if (ret == 0) {
288 printk(KERN_ERR "could not attach integrity payload\n");
Wenwen Wange7bf90e2019-07-11 14:22:02 -0500289 status = BLK_STS_RESOURCE;
290 goto err_end_io;
291 }
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200292
293 if (ret < bytes)
294 break;
295
296 buf += bytes;
297 len -= bytes;
298 offset = 0;
299 }
300
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200301 /* Auto-generate integrity metadata if this is a write */
Dmitry Monakhov63573e32017-06-29 11:31:15 -0700302 if (bio_data_dir(bio) == WRITE) {
303 bio_integrity_process(bio, &bio->bi_iter,
304 bi->profile->generate_fn);
Ming Lei7759eb22018-09-05 15:45:54 -0600305 } else {
306 bip->bio_iter = bio->bi_iter;
Dmitry Monakhov63573e32017-06-29 11:31:15 -0700307 }
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700308 return true;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200309
Dmitry Monakhove23947b2017-06-29 11:31:11 -0700310err_end_io:
311 bio->bi_status = status;
312 bio_endio(bio);
313 return false;
314
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200315}
316EXPORT_SYMBOL(bio_integrity_prep);
317
318/**
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200319 * bio_integrity_verify_fn - Integrity I/O completion worker
320 * @work: Work struct stored in bio to be verified
321 *
322 * Description: This workqueue function is called to complete a READ
323 * request. The function verifies the transferred integrity metadata
324 * and then calls the original bio end_io function.
325 */
326static void bio_integrity_verify_fn(struct work_struct *work)
327{
Jens Axboeb9846792008-06-17 19:05:48 +0200328 struct bio_integrity_payload *bip =
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200329 container_of(work, struct bio_integrity_payload, bip_work);
330 struct bio *bio = bip->bip_bio;
Christoph Hellwig74d46992017-08-23 19:10:32 +0200331 struct blk_integrity *bi = blk_get_integrity(bio->bi_disk);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200332
Dmitry Monakhov63573e32017-06-29 11:31:15 -0700333 /*
334 * At the moment verify is called bio's iterator was advanced
335 * during split and completion, we need to rewind iterator to
336 * it's original position.
337 */
Ming Lei7759eb22018-09-05 15:45:54 -0600338 bio->bi_status = bio_integrity_process(bio, &bip->bio_iter,
339 bi->profile->verify_fn);
Christoph Hellwig7c20f112017-07-03 16:58:43 -0600340 bio_integrity_free(bio);
Christoph Hellwig4246a0b2015-07-20 15:29:37 +0200341 bio_endio(bio);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200342}
343
344/**
Christoph Hellwig7c20f112017-07-03 16:58:43 -0600345 * __bio_integrity_endio - Integrity I/O completion function
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200346 * @bio: Protected bio
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200347 *
348 * Description: Completion for integrity I/O
349 *
350 * Normally I/O completion is done in interrupt context. However,
351 * verifying I/O integrity is a time-consuming task which must be run
352 * in process context. This function postpones completion
353 * accordingly.
354 */
Christoph Hellwig7c20f112017-07-03 16:58:43 -0600355bool __bio_integrity_endio(struct bio *bio)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200356{
Milan Broz97e05462017-08-09 17:47:26 +0200357 struct blk_integrity *bi = blk_get_integrity(bio->bi_disk);
Christoph Hellwigf86e28c2017-08-09 17:47:27 +0200358 struct bio_integrity_payload *bip = bio_integrity(bio);
Milan Brozc775d202017-08-09 17:47:26 +0200359
360 if (bio_op(bio) == REQ_OP_READ && !bio->bi_status &&
Christoph Hellwigf86e28c2017-08-09 17:47:27 +0200361 (bip->bip_flags & BIP_BLOCK_INTEGRITY) && bi->profile->verify_fn) {
Christoph Hellwig7c20f112017-07-03 16:58:43 -0600362 INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
363 queue_work(kintegrityd_wq, &bip->bip_work);
364 return false;
Martin K. Petersen7b24fc42009-01-04 02:43:38 -0500365 }
366
Christoph Hellwig7c20f112017-07-03 16:58:43 -0600367 bio_integrity_free(bio);
368 return true;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200369}
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200370
371/**
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200372 * bio_integrity_advance - Advance integrity vector
373 * @bio: bio whose integrity vector to update
374 * @bytes_done: number of data bytes that have been completed
375 *
376 * Description: This function calculates how many integrity bytes the
377 * number of completed data bytes correspond to and advances the
378 * integrity vector accordingly.
379 */
380void bio_integrity_advance(struct bio *bio, unsigned int bytes_done)
381{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400382 struct bio_integrity_payload *bip = bio_integrity(bio);
Christoph Hellwig74d46992017-08-23 19:10:32 +0200383 struct blk_integrity *bi = blk_get_integrity(bio->bi_disk);
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800384 unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200385
Dmitry Monakhov309a62f2017-06-29 11:31:09 -0700386 bip->bip_iter.bi_sector += bytes_done >> 9;
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800387 bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200388}
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200389
390/**
391 * bio_integrity_trim - Trim integrity vector
392 * @bio: bio whose integrity vector to update
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200393 *
394 * Description: Used to trim the integrity vector in a cloned bio.
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200395 */
Dmitry Monakhovfbd08e72017-06-29 11:31:10 -0700396void bio_integrity_trim(struct bio *bio)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200397{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400398 struct bio_integrity_payload *bip = bio_integrity(bio);
Christoph Hellwig74d46992017-08-23 19:10:32 +0200399 struct blk_integrity *bi = blk_get_integrity(bio->bi_disk);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200400
Dmitry Monakhovfbd08e72017-06-29 11:31:10 -0700401 bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio));
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200402}
403EXPORT_SYMBOL(bio_integrity_trim);
404
405/**
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200406 * bio_integrity_clone - Callback for cloning bios with integrity metadata
407 * @bio: New bio
408 * @bio_src: Original bio
un'ichi Nomura87092692009-03-09 10:40:52 +0100409 * @gfp_mask: Memory allocation mask
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200410 *
411 * Description: Called to allocate a bip when cloning a bio
412 */
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200413int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
Kent Overstreet1e2a410f2012-09-06 15:34:56 -0700414 gfp_t gfp_mask)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200415{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400416 struct bio_integrity_payload *bip_src = bio_integrity(bio_src);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200417 struct bio_integrity_payload *bip;
418
419 BUG_ON(bip_src == NULL);
420
Kent Overstreet1e2a410f2012-09-06 15:34:56 -0700421 bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt);
Dan Carpenter7b6c0f82015-12-09 13:21:23 +0300422 if (IS_ERR(bip))
423 return PTR_ERR(bip);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200424
425 memcpy(bip->bip_vec, bip_src->bip_vec,
426 bip_src->bip_vcnt * sizeof(struct bio_vec));
427
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200428 bip->bip_vcnt = bip_src->bip_vcnt;
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800429 bip->bip_iter = bip_src->bip_iter;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200430
431 return 0;
432}
433EXPORT_SYMBOL(bio_integrity_clone);
434
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200435int bioset_integrity_create(struct bio_set *bs, int pool_size)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200436{
Kent Overstreet8aa6ba22018-05-08 21:33:50 -0400437 if (mempool_initialized(&bs->bio_integrity_pool))
Martin K. Petersena91a2782011-03-17 11:11:05 +0100438 return 0;
439
Kent Overstreet8aa6ba22018-05-08 21:33:50 -0400440 if (mempool_init_slab_pool(&bs->bio_integrity_pool,
441 pool_size, bip_slab))
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200442 return -1;
Martin K. Petersen6d2a78e2009-03-10 08:27:39 +0100443
Kent Overstreet8aa6ba22018-05-08 21:33:50 -0400444 if (biovec_init_pool(&bs->bvec_integrity_pool, pool_size)) {
445 mempool_exit(&bs->bio_integrity_pool);
Gu Zhengbc5c8f02013-09-11 14:23:21 -0700446 return -1;
447 }
448
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200449 return 0;
450}
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200451EXPORT_SYMBOL(bioset_integrity_create);
452
453void bioset_integrity_free(struct bio_set *bs)
454{
Kent Overstreet8aa6ba22018-05-08 21:33:50 -0400455 mempool_exit(&bs->bio_integrity_pool);
456 mempool_exit(&bs->bvec_integrity_pool);
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200457}
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200458
459void __init bio_integrity_init(void)
460{
Tejun Heoa6e8dc42011-01-03 15:01:48 +0100461 /*
462 * kintegrityd won't block much but may burn a lot of CPU cycles.
463 * Make it highpri CPU intensive wq with max concurrency of 1.
464 */
465 kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM |
466 WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1);
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200467 if (!kintegrityd_wq)
468 panic("Failed to create kintegrityd\n");
469
Kent Overstreet9f060e22012-10-12 15:29:33 -0700470 bip_slab = kmem_cache_create("bio_integrity_payload",
471 sizeof(struct bio_integrity_payload) +
472 sizeof(struct bio_vec) * BIP_INLINE_VECS,
473 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200474}