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Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02001/*
2 * bio-integrity.c - bio data integrity extensions
3 *
Martin K. Petersen7878cba2009-06-26 15:37:49 +02004 * Copyright (C) 2007, 2008, 2009 Oracle Corporation
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +02005 * Written by: Martin K. Petersen <martin.petersen@oracle.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License version
9 * 2 as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; see the file COPYING. If not, write to
18 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
19 * USA.
20 *
21 */
22
23#include <linux/blkdev.h>
24#include <linux/mempool.h>
Paul Gortmakerafeacc82011-05-26 16:00:52 -040025#include <linux/export.h>
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020026#include <linux/bio.h>
27#include <linux/workqueue.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020029
Kent Overstreet9f060e22012-10-12 15:29:33 -070030#define BIP_INLINE_VECS 4
Martin K. Petersen7878cba2009-06-26 15:37:49 +020031
Kent Overstreet9f060e22012-10-12 15:29:33 -070032static struct kmem_cache *bip_slab;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020033static struct workqueue_struct *kintegrityd_wq;
34
Martin K. Petersen7878cba2009-06-26 15:37:49 +020035/**
Kent Overstreet1e2a410f2012-09-06 15:34:56 -070036 * bio_integrity_alloc - Allocate integrity payload and attach it to bio
Martin K. Petersen7878cba2009-06-26 15:37:49 +020037 * @bio: bio to attach integrity metadata to
38 * @gfp_mask: Memory allocation mask
39 * @nr_vecs: Number of integrity metadata scatter-gather elements
Martin K. Petersen7878cba2009-06-26 15:37:49 +020040 *
41 * Description: This function prepares a bio for attaching integrity
42 * metadata. nr_vecs specifies the maximum number of pages containing
43 * integrity metadata that can be attached.
44 */
Kent Overstreet1e2a410f2012-09-06 15:34:56 -070045struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio,
46 gfp_t gfp_mask,
47 unsigned int nr_vecs)
Martin K. Petersen7878cba2009-06-26 15:37:49 +020048{
49 struct bio_integrity_payload *bip;
Kent Overstreet1e2a410f2012-09-06 15:34:56 -070050 struct bio_set *bs = bio->bi_pool;
Kent Overstreet9f060e22012-10-12 15:29:33 -070051 unsigned long idx = BIO_POOL_NONE;
52 unsigned inline_vecs;
Kent Overstreet1e2a410f2012-09-06 15:34:56 -070053
Kent Overstreet9f060e22012-10-12 15:29:33 -070054 if (!bs) {
55 bip = kmalloc(sizeof(struct bio_integrity_payload) +
56 sizeof(struct bio_vec) * nr_vecs, gfp_mask);
57 inline_vecs = nr_vecs;
58 } else {
Martin K. Petersen7878cba2009-06-26 15:37:49 +020059 bip = mempool_alloc(bs->bio_integrity_pool, gfp_mask);
Kent Overstreet9f060e22012-10-12 15:29:33 -070060 inline_vecs = BIP_INLINE_VECS;
Martin K. Petersen7878cba2009-06-26 15:37:49 +020061 }
62
Kent Overstreet9f060e22012-10-12 15:29:33 -070063 if (unlikely(!bip))
64 return NULL;
65
Martin K. Petersen7878cba2009-06-26 15:37:49 +020066 memset(bip, 0, sizeof(*bip));
67
Kent Overstreet9f060e22012-10-12 15:29:33 -070068 if (nr_vecs > inline_vecs) {
69 bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx,
70 bs->bvec_integrity_pool);
71 if (!bip->bip_vec)
72 goto err;
Gu Zhengcbcd10542014-07-01 10:36:47 -060073 bip->bip_max_vcnt = bvec_nr_vecs(idx);
Kent Overstreet9f060e22012-10-12 15:29:33 -070074 } else {
75 bip->bip_vec = bip->bip_inline_vecs;
Gu Zhengcbcd10542014-07-01 10:36:47 -060076 bip->bip_max_vcnt = inline_vecs;
Kent Overstreet9f060e22012-10-12 15:29:33 -070077 }
78
Martin K. Petersen7878cba2009-06-26 15:37:49 +020079 bip->bip_slab = idx;
80 bip->bip_bio = bio;
81 bio->bi_integrity = bip;
Martin K. Petersen180b2f92014-09-26 19:19:56 -040082 bio->bi_rw |= REQ_INTEGRITY;
Martin K. Petersen7878cba2009-06-26 15:37:49 +020083
84 return bip;
Kent Overstreet9f060e22012-10-12 15:29:33 -070085err:
86 mempool_free(bip, bs->bio_integrity_pool);
87 return NULL;
Martin K. Petersen7878cba2009-06-26 15:37:49 +020088}
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020089EXPORT_SYMBOL(bio_integrity_alloc);
90
91/**
92 * bio_integrity_free - Free bio integrity payload
93 * @bio: bio containing bip to be freed
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020094 *
95 * Description: Used to free the integrity portion of a bio. Usually
96 * called from bio_free().
97 */
Kent Overstreet1e2a410f2012-09-06 15:34:56 -070098void bio_integrity_free(struct bio *bio)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020099{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400100 struct bio_integrity_payload *bip = bio_integrity(bio);
Kent Overstreet1e2a410f2012-09-06 15:34:56 -0700101 struct bio_set *bs = bio->bi_pool;
102
Martin K. Petersenb1f0138852014-09-26 19:20:04 -0400103 if (bip->bip_flags & BIP_BLOCK_INTEGRITY)
Martin K. Petersen5f9378f2014-09-26 19:19:58 -0400104 kfree(page_address(bip->bip_vec->bv_page) +
105 bip->bip_vec->bv_offset);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200106
Kent Overstreet9f060e22012-10-12 15:29:33 -0700107 if (bs) {
108 if (bip->bip_slab != BIO_POOL_NONE)
109 bvec_free(bs->bvec_integrity_pool, bip->bip_vec,
110 bip->bip_slab);
111
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200112 mempool_free(bip, bs->bio_integrity_pool);
Kent Overstreet9f060e22012-10-12 15:29:33 -0700113 } else {
114 kfree(bip);
115 }
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200116
117 bio->bi_integrity = NULL;
118}
119EXPORT_SYMBOL(bio_integrity_free);
120
121/**
122 * bio_integrity_add_page - Attach integrity metadata
123 * @bio: bio to update
124 * @page: page containing integrity metadata
125 * @len: number of bytes of integrity metadata in page
126 * @offset: start offset within page
127 *
128 * Description: Attach a page containing integrity metadata to bio.
129 */
130int bio_integrity_add_page(struct bio *bio, struct page *page,
131 unsigned int len, unsigned int offset)
132{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400133 struct bio_integrity_payload *bip = bio_integrity(bio);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200134 struct bio_vec *iv;
135
Gu Zhengcbcd10542014-07-01 10:36:47 -0600136 if (bip->bip_vcnt >= bip->bip_max_vcnt) {
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200137 printk(KERN_ERR "%s: bip_vec full\n", __func__);
138 return 0;
139 }
140
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800141 iv = bip->bip_vec + bip->bip_vcnt;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200142
143 iv->bv_page = page;
144 iv->bv_len = len;
145 iv->bv_offset = offset;
146 bip->bip_vcnt++;
147
148 return len;
149}
150EXPORT_SYMBOL(bio_integrity_add_page);
151
152/**
153 * bio_integrity_enabled - Check whether integrity can be passed
154 * @bio: bio to check
155 *
156 * Description: Determines whether bio_integrity_prep() can be called
157 * on this bio or not. bio data direction and target device must be
158 * set prior to calling. The functions honors the write_generate and
159 * read_verify flags in sysfs.
160 */
Martin K. Petersene7258c12014-09-26 19:19:55 -0400161bool bio_integrity_enabled(struct bio *bio)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200162{
Martin K. Petersene7258c12014-09-26 19:19:55 -0400163 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
164
Martin K. Petersene69f18f2014-04-08 22:59:31 -0400165 if (!bio_is_rw(bio))
Martin K. Petersene7258c12014-09-26 19:19:55 -0400166 return false;
Martin K. Petersene69f18f2014-04-08 22:59:31 -0400167
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200168 /* Already protected? */
169 if (bio_integrity(bio))
Martin K. Petersene7258c12014-09-26 19:19:55 -0400170 return false;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200171
Martin K. Petersene7258c12014-09-26 19:19:55 -0400172 if (bi == NULL)
173 return false;
174
175 if (bio_data_dir(bio) == READ && bi->verify_fn != NULL &&
Martin K. Petersen8288f492014-09-26 19:20:02 -0400176 (bi->flags & BLK_INTEGRITY_VERIFY))
Martin K. Petersene7258c12014-09-26 19:19:55 -0400177 return true;
178
179 if (bio_data_dir(bio) == WRITE && bi->generate_fn != NULL &&
Martin K. Petersen8288f492014-09-26 19:20:02 -0400180 (bi->flags & BLK_INTEGRITY_GENERATE))
Martin K. Petersene7258c12014-09-26 19:19:55 -0400181 return true;
182
183 return false;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200184}
185EXPORT_SYMBOL(bio_integrity_enabled);
186
187/**
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400188 * bio_integrity_intervals - Return number of integrity intervals for a bio
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200189 * @bi: blk_integrity profile for device
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400190 * @sectors: Size of the bio in 512-byte sectors
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200191 *
192 * Description: The block layer calculates everything in 512 byte
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400193 * sectors but integrity metadata is done in terms of the data integrity
194 * interval size of the storage device. Convert the block layer sectors
195 * to the appropriate number of integrity intervals.
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200196 */
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400197static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
198 unsigned int sectors)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200199{
Martin K. Petersen5a2aa872014-09-26 19:20:00 -0400200 return sectors >> (ilog2(bi->interval) - 9);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200201}
202
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800203static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
204 unsigned int sectors)
205{
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400206 return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800207}
208
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200209/**
Martin K. Petersen18593082014-09-26 19:20:01 -0400210 * bio_integrity_process - Process integrity metadata for a bio
Gu Zhengbf36f9c2014-02-21 18:10:59 +0800211 * @bio: bio to generate/verify integrity metadata for
Martin K. Petersen18593082014-09-26 19:20:01 -0400212 * @proc_fn: Pointer to the relevant processing function
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200213 */
Martin K. Petersen18593082014-09-26 19:20:01 -0400214static int bio_integrity_process(struct bio *bio,
215 integrity_processing_fn *proc_fn)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200216{
217 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
Martin K. Petersen18593082014-09-26 19:20:01 -0400218 struct blk_integrity_iter iter;
Martin K. Petersen0bc69972014-04-08 22:43:44 -0400219 struct bio_vec *bv;
Martin K. Petersen5f9378f2014-09-26 19:19:58 -0400220 struct bio_integrity_payload *bip = bio_integrity(bio);
Martin K. Petersen18593082014-09-26 19:20:01 -0400221 unsigned int i, ret = 0;
Martin K. Petersen5f9378f2014-09-26 19:19:58 -0400222 void *prot_buf = page_address(bip->bip_vec->bv_page) +
223 bip->bip_vec->bv_offset;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200224
Martin K. Petersen18593082014-09-26 19:20:01 -0400225 iter.disk_name = bio->bi_bdev->bd_disk->disk_name;
226 iter.interval = bi->interval;
227 iter.seed = bip_get_seed(bip);
228 iter.prot_buf = prot_buf;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200229
Martin K. Petersen0bc69972014-04-08 22:43:44 -0400230 bio_for_each_segment_all(bv, bio, i) {
231 void *kaddr = kmap_atomic(bv->bv_page);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200232
Martin K. Petersen18593082014-09-26 19:20:01 -0400233 iter.data_buf = kaddr + bv->bv_offset;
234 iter.data_size = bv->bv_len;
235
236 ret = proc_fn(&iter);
237 if (ret) {
238 kunmap_atomic(kaddr);
239 return ret;
Gu Zhengbf36f9c2014-02-21 18:10:59 +0800240 }
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200241
Cong Wange8e3c3d2011-11-25 23:14:27 +0800242 kunmap_atomic(kaddr);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200243 }
Gu Zhengbf36f9c2014-02-21 18:10:59 +0800244 return ret;
245}
246
247/**
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200248 * bio_integrity_prep - Prepare bio for integrity I/O
249 * @bio: bio to prepare
250 *
251 * Description: Allocates a buffer for integrity metadata, maps the
252 * pages and attaches them to a bio. The bio must have data
253 * direction, target device and start sector set priot to calling. In
254 * the WRITE case, integrity metadata will be generated using the
255 * block device's integrity function. In the READ case, the buffer
256 * will be prepared for DMA and a suitable end_io handler set up.
257 */
258int bio_integrity_prep(struct bio *bio)
259{
260 struct bio_integrity_payload *bip;
261 struct blk_integrity *bi;
262 struct request_queue *q;
263 void *buf;
264 unsigned long start, end;
265 unsigned int len, nr_pages;
266 unsigned int bytes, offset, i;
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400267 unsigned int intervals;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200268
269 bi = bdev_get_integrity(bio->bi_bdev);
270 q = bdev_get_queue(bio->bi_bdev);
271 BUG_ON(bi == NULL);
272 BUG_ON(bio_integrity(bio));
273
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400274 intervals = bio_integrity_intervals(bi, bio_sectors(bio));
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200275
276 /* Allocate kernel buffer for protection data */
Martin K. Petersen3be91c42014-09-26 19:19:59 -0400277 len = intervals * bi->tuple_size;
David Rientjes72f46502010-08-23 13:35:09 +0200278 buf = kmalloc(len, GFP_NOIO | q->bounce_gfp);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200279 if (unlikely(buf == NULL)) {
280 printk(KERN_ERR "could not allocate integrity buffer\n");
Andrew Morton220eb7f2010-08-23 13:36:20 +0200281 return -ENOMEM;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200282 }
283
284 end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT;
285 start = ((unsigned long) buf) >> PAGE_SHIFT;
286 nr_pages = end - start;
287
288 /* Allocate bio integrity payload and integrity vectors */
289 bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages);
290 if (unlikely(bip == NULL)) {
291 printk(KERN_ERR "could not allocate data integrity bioset\n");
292 kfree(buf);
293 return -EIO;
294 }
295
Martin K. Petersenb1f0138852014-09-26 19:20:04 -0400296 bip->bip_flags |= BIP_BLOCK_INTEGRITY;
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800297 bip->bip_iter.bi_size = len;
Martin K. Petersen18593082014-09-26 19:20:01 -0400298 bip_set_seed(bip, bio->bi_iter.bi_sector);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200299
300 /* Map it */
301 offset = offset_in_page(buf);
302 for (i = 0 ; i < nr_pages ; i++) {
303 int ret;
304 bytes = PAGE_SIZE - offset;
305
306 if (len <= 0)
307 break;
308
309 if (bytes > len)
310 bytes = len;
311
312 ret = bio_integrity_add_page(bio, virt_to_page(buf),
313 bytes, offset);
314
315 if (ret == 0)
316 return 0;
317
318 if (ret < bytes)
319 break;
320
321 buf += bytes;
322 len -= bytes;
323 offset = 0;
324 }
325
326 /* Install custom I/O completion handler if read verify is enabled */
327 if (bio_data_dir(bio) == READ) {
328 bip->bip_end_io = bio->bi_end_io;
329 bio->bi_end_io = bio_integrity_endio;
330 }
331
332 /* Auto-generate integrity metadata if this is a write */
333 if (bio_data_dir(bio) == WRITE)
Martin K. Petersen18593082014-09-26 19:20:01 -0400334 bio_integrity_process(bio, bi->generate_fn);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200335
336 return 0;
337}
338EXPORT_SYMBOL(bio_integrity_prep);
339
340/**
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200341 * bio_integrity_verify_fn - Integrity I/O completion worker
342 * @work: Work struct stored in bio to be verified
343 *
344 * Description: This workqueue function is called to complete a READ
345 * request. The function verifies the transferred integrity metadata
346 * and then calls the original bio end_io function.
347 */
348static void bio_integrity_verify_fn(struct work_struct *work)
349{
Jens Axboeb9846792008-06-17 19:05:48 +0200350 struct bio_integrity_payload *bip =
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200351 container_of(work, struct bio_integrity_payload, bip_work);
352 struct bio *bio = bip->bip_bio;
Martin K. Petersen18593082014-09-26 19:20:01 -0400353 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
Martin K. Petersen7b24fc42009-01-04 02:43:38 -0500354 int error;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200355
Martin K. Petersen18593082014-09-26 19:20:01 -0400356 error = bio_integrity_process(bio, bi->verify_fn);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200357
358 /* Restore original bio completion handler */
359 bio->bi_end_io = bip->bip_end_io;
Kent Overstreet196d38b2013-11-23 18:34:15 -0800360 bio_endio_nodec(bio, error);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200361}
362
363/**
364 * bio_integrity_endio - Integrity I/O completion function
365 * @bio: Protected bio
366 * @error: Pointer to errno
367 *
368 * Description: Completion for integrity I/O
369 *
370 * Normally I/O completion is done in interrupt context. However,
371 * verifying I/O integrity is a time-consuming task which must be run
372 * in process context. This function postpones completion
373 * accordingly.
374 */
375void bio_integrity_endio(struct bio *bio, int error)
376{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400377 struct bio_integrity_payload *bip = bio_integrity(bio);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200378
379 BUG_ON(bip->bip_bio != bio);
380
Martin K. Petersen7b24fc42009-01-04 02:43:38 -0500381 /* In case of an I/O error there is no point in verifying the
382 * integrity metadata. Restore original bio end_io handler
383 * and run it.
384 */
385 if (error) {
386 bio->bi_end_io = bip->bip_end_io;
Sagi Grimberg16f408d2014-08-13 14:49:31 +0300387 bio_endio_nodec(bio, error);
Martin K. Petersen7b24fc42009-01-04 02:43:38 -0500388
389 return;
390 }
391
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200392 INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
393 queue_work(kintegrityd_wq, &bip->bip_work);
394}
395EXPORT_SYMBOL(bio_integrity_endio);
396
397/**
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200398 * bio_integrity_advance - Advance integrity vector
399 * @bio: bio whose integrity vector to update
400 * @bytes_done: number of data bytes that have been completed
401 *
402 * Description: This function calculates how many integrity bytes the
403 * number of completed data bytes correspond to and advances the
404 * integrity vector accordingly.
405 */
406void bio_integrity_advance(struct bio *bio, unsigned int bytes_done)
407{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400408 struct bio_integrity_payload *bip = bio_integrity(bio);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200409 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800410 unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200411
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800412 bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200413}
414EXPORT_SYMBOL(bio_integrity_advance);
415
416/**
417 * bio_integrity_trim - Trim integrity vector
418 * @bio: bio whose integrity vector to update
419 * @offset: offset to first data sector
420 * @sectors: number of data sectors
421 *
422 * Description: Used to trim the integrity vector in a cloned bio.
423 * The ivec will be advanced corresponding to 'offset' data sectors
424 * and the length will be truncated corresponding to 'len' data
425 * sectors.
426 */
Jens Axboeb9846792008-06-17 19:05:48 +0200427void bio_integrity_trim(struct bio *bio, unsigned int offset,
428 unsigned int sectors)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200429{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400430 struct bio_integrity_payload *bip = bio_integrity(bio);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200431 struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200432
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800433 bio_integrity_advance(bio, offset << 9);
434 bip->bip_iter.bi_size = bio_integrity_bytes(bi, sectors);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200435}
436EXPORT_SYMBOL(bio_integrity_trim);
437
438/**
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200439 * bio_integrity_clone - Callback for cloning bios with integrity metadata
440 * @bio: New bio
441 * @bio_src: Original bio
un'ichi Nomura87092692009-03-09 10:40:52 +0100442 * @gfp_mask: Memory allocation mask
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200443 *
444 * Description: Called to allocate a bip when cloning a bio
445 */
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200446int bio_integrity_clone(struct bio *bio, struct bio *bio_src,
Kent Overstreet1e2a410f2012-09-06 15:34:56 -0700447 gfp_t gfp_mask)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200448{
Martin K. Petersen180b2f92014-09-26 19:19:56 -0400449 struct bio_integrity_payload *bip_src = bio_integrity(bio_src);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200450 struct bio_integrity_payload *bip;
451
452 BUG_ON(bip_src == NULL);
453
Kent Overstreet1e2a410f2012-09-06 15:34:56 -0700454 bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt);
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200455
456 if (bip == NULL)
457 return -EIO;
458
459 memcpy(bip->bip_vec, bip_src->bip_vec,
460 bip_src->bip_vcnt * sizeof(struct bio_vec));
461
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200462 bip->bip_vcnt = bip_src->bip_vcnt;
Kent Overstreetd57a5f72013-11-23 17:20:16 -0800463 bip->bip_iter = bip_src->bip_iter;
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200464
465 return 0;
466}
467EXPORT_SYMBOL(bio_integrity_clone);
468
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200469int bioset_integrity_create(struct bio_set *bs, int pool_size)
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200470{
Martin K. Petersena91a2782011-03-17 11:11:05 +0100471 if (bs->bio_integrity_pool)
472 return 0;
473
Kent Overstreet9f060e22012-10-12 15:29:33 -0700474 bs->bio_integrity_pool = mempool_create_slab_pool(pool_size, bip_slab);
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200475 if (!bs->bio_integrity_pool)
476 return -1;
Martin K. Petersen6d2a78e2009-03-10 08:27:39 +0100477
Fabian Fredericka6c39cb4f2014-04-22 15:09:05 -0600478 bs->bvec_integrity_pool = biovec_create_pool(pool_size);
Gu Zhengbc5c8f02013-09-11 14:23:21 -0700479 if (!bs->bvec_integrity_pool) {
480 mempool_destroy(bs->bio_integrity_pool);
481 return -1;
482 }
483
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +0200484 return 0;
485}
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200486EXPORT_SYMBOL(bioset_integrity_create);
487
488void bioset_integrity_free(struct bio_set *bs)
489{
490 if (bs->bio_integrity_pool)
491 mempool_destroy(bs->bio_integrity_pool);
Kent Overstreet9f060e22012-10-12 15:29:33 -0700492
493 if (bs->bvec_integrity_pool)
Bjorn Helgaasadbe6992013-05-29 16:29:55 -0600494 mempool_destroy(bs->bvec_integrity_pool);
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200495}
496EXPORT_SYMBOL(bioset_integrity_free);
497
498void __init bio_integrity_init(void)
499{
Tejun Heoa6e8dc42011-01-03 15:01:48 +0100500 /*
501 * kintegrityd won't block much but may burn a lot of CPU cycles.
502 * Make it highpri CPU intensive wq with max concurrency of 1.
503 */
504 kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM |
505 WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1);
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200506 if (!kintegrityd_wq)
507 panic("Failed to create kintegrityd\n");
508
Kent Overstreet9f060e22012-10-12 15:29:33 -0700509 bip_slab = kmem_cache_create("bio_integrity_payload",
510 sizeof(struct bio_integrity_payload) +
511 sizeof(struct bio_vec) * BIP_INLINE_VECS,
512 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);
513 if (!bip_slab)
514 panic("Failed to create slab\n");
Martin K. Petersen7878cba2009-06-26 15:37:49 +0200515}