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7ba1ba12 MP |
1 | /* |
2 | * bio-integrity.c - bio data integrity extensions | |
3 | * | |
7878cba9 | 4 | * Copyright (C) 2007, 2008, 2009 Oracle Corporation |
7ba1ba12 MP |
5 | * Written by: Martin K. Petersen <martin.petersen@oracle.com> |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License version | |
9 | * 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; see the file COPYING. If not, write to | |
18 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, | |
19 | * USA. | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/blkdev.h> | |
24 | #include <linux/mempool.h> | |
afeacc8c | 25 | #include <linux/export.h> |
7ba1ba12 MP |
26 | #include <linux/bio.h> |
27 | #include <linux/workqueue.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
1179a5a0 | 29 | #include "blk.h" |
7ba1ba12 | 30 | |
9f060e22 | 31 | #define BIP_INLINE_VECS 4 |
7878cba9 | 32 | |
9f060e22 | 33 | static struct kmem_cache *bip_slab; |
7ba1ba12 MP |
34 | static struct workqueue_struct *kintegrityd_wq; |
35 | ||
5a48fc14 DW |
36 | void blk_flush_integrity(void) |
37 | { | |
38 | flush_workqueue(kintegrityd_wq); | |
39 | } | |
40 | ||
7ba1ba12 | 41 | /** |
1e2a410f | 42 | * bio_integrity_alloc - Allocate integrity payload and attach it to bio |
7ba1ba12 MP |
43 | * @bio: bio to attach integrity metadata to |
44 | * @gfp_mask: Memory allocation mask | |
45 | * @nr_vecs: Number of integrity metadata scatter-gather elements | |
7ba1ba12 MP |
46 | * |
47 | * Description: This function prepares a bio for attaching integrity | |
48 | * metadata. nr_vecs specifies the maximum number of pages containing | |
49 | * integrity metadata that can be attached. | |
50 | */ | |
1e2a410f KO |
51 | struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, |
52 | gfp_t gfp_mask, | |
53 | unsigned int nr_vecs) | |
7ba1ba12 MP |
54 | { |
55 | struct bio_integrity_payload *bip; | |
1e2a410f | 56 | struct bio_set *bs = bio->bi_pool; |
9f060e22 KO |
57 | unsigned inline_vecs; |
58 | ||
8aa6ba2f | 59 | if (!bs || !mempool_initialized(&bs->bio_integrity_pool)) { |
9f060e22 KO |
60 | bip = kmalloc(sizeof(struct bio_integrity_payload) + |
61 | sizeof(struct bio_vec) * nr_vecs, gfp_mask); | |
62 | inline_vecs = nr_vecs; | |
63 | } else { | |
8aa6ba2f | 64 | bip = mempool_alloc(&bs->bio_integrity_pool, gfp_mask); |
9f060e22 | 65 | inline_vecs = BIP_INLINE_VECS; |
7ba1ba12 MP |
66 | } |
67 | ||
9f060e22 | 68 | if (unlikely(!bip)) |
06c1e390 | 69 | return ERR_PTR(-ENOMEM); |
9f060e22 | 70 | |
7878cba9 MP |
71 | memset(bip, 0, sizeof(*bip)); |
72 | ||
9f060e22 | 73 | if (nr_vecs > inline_vecs) { |
ed996a52 CH |
74 | unsigned long idx = 0; |
75 | ||
9f060e22 | 76 | bip->bip_vec = bvec_alloc(gfp_mask, nr_vecs, &idx, |
8aa6ba2f | 77 | &bs->bvec_integrity_pool); |
9f060e22 KO |
78 | if (!bip->bip_vec) |
79 | goto err; | |
cbcd1054 | 80 | bip->bip_max_vcnt = bvec_nr_vecs(idx); |
ed996a52 | 81 | bip->bip_slab = idx; |
9f060e22 KO |
82 | } else { |
83 | bip->bip_vec = bip->bip_inline_vecs; | |
cbcd1054 | 84 | bip->bip_max_vcnt = inline_vecs; |
9f060e22 KO |
85 | } |
86 | ||
7ba1ba12 MP |
87 | bip->bip_bio = bio; |
88 | bio->bi_integrity = bip; | |
1eff9d32 | 89 | bio->bi_opf |= REQ_INTEGRITY; |
7ba1ba12 MP |
90 | |
91 | return bip; | |
9f060e22 | 92 | err: |
8aa6ba2f | 93 | mempool_free(bip, &bs->bio_integrity_pool); |
06c1e390 | 94 | return ERR_PTR(-ENOMEM); |
7ba1ba12 | 95 | } |
7ba1ba12 MP |
96 | EXPORT_SYMBOL(bio_integrity_alloc); |
97 | ||
98 | /** | |
99 | * bio_integrity_free - Free bio integrity payload | |
100 | * @bio: bio containing bip to be freed | |
7ba1ba12 MP |
101 | * |
102 | * Description: Used to free the integrity portion of a bio. Usually | |
103 | * called from bio_free(). | |
104 | */ | |
7c20f116 | 105 | static void bio_integrity_free(struct bio *bio) |
7ba1ba12 | 106 | { |
180b2f95 | 107 | struct bio_integrity_payload *bip = bio_integrity(bio); |
1e2a410f KO |
108 | struct bio_set *bs = bio->bi_pool; |
109 | ||
b1f01388 | 110 | if (bip->bip_flags & BIP_BLOCK_INTEGRITY) |
5f9378fa MP |
111 | kfree(page_address(bip->bip_vec->bv_page) + |
112 | bip->bip_vec->bv_offset); | |
7ba1ba12 | 113 | |
8aa6ba2f KO |
114 | if (bs && mempool_initialized(&bs->bio_integrity_pool)) { |
115 | bvec_free(&bs->bvec_integrity_pool, bip->bip_vec, bip->bip_slab); | |
9f060e22 | 116 | |
8aa6ba2f | 117 | mempool_free(bip, &bs->bio_integrity_pool); |
9f060e22 KO |
118 | } else { |
119 | kfree(bip); | |
120 | } | |
7ba1ba12 MP |
121 | |
122 | bio->bi_integrity = NULL; | |
7c20f116 | 123 | bio->bi_opf &= ~REQ_INTEGRITY; |
7ba1ba12 | 124 | } |
7ba1ba12 MP |
125 | |
126 | /** | |
127 | * bio_integrity_add_page - Attach integrity metadata | |
128 | * @bio: bio to update | |
129 | * @page: page containing integrity metadata | |
130 | * @len: number of bytes of integrity metadata in page | |
131 | * @offset: start offset within page | |
132 | * | |
133 | * Description: Attach a page containing integrity metadata to bio. | |
134 | */ | |
135 | int bio_integrity_add_page(struct bio *bio, struct page *page, | |
136 | unsigned int len, unsigned int offset) | |
137 | { | |
180b2f95 | 138 | struct bio_integrity_payload *bip = bio_integrity(bio); |
7ba1ba12 MP |
139 | struct bio_vec *iv; |
140 | ||
cbcd1054 | 141 | if (bip->bip_vcnt >= bip->bip_max_vcnt) { |
7ba1ba12 MP |
142 | printk(KERN_ERR "%s: bip_vec full\n", __func__); |
143 | return 0; | |
144 | } | |
145 | ||
d57a5f7c | 146 | iv = bip->bip_vec + bip->bip_vcnt; |
7ba1ba12 | 147 | |
87a816df | 148 | if (bip->bip_vcnt && |
74d46992 | 149 | bvec_gap_to_prev(bio->bi_disk->queue, |
87a816df SG |
150 | &bip->bip_vec[bip->bip_vcnt - 1], offset)) |
151 | return 0; | |
152 | ||
7ba1ba12 MP |
153 | iv->bv_page = page; |
154 | iv->bv_len = len; | |
155 | iv->bv_offset = offset; | |
156 | bip->bip_vcnt++; | |
157 | ||
158 | return len; | |
159 | } | |
160 | EXPORT_SYMBOL(bio_integrity_add_page); | |
161 | ||
7ba1ba12 | 162 | /** |
18593088 | 163 | * bio_integrity_process - Process integrity metadata for a bio |
bf36f9cf | 164 | * @bio: bio to generate/verify integrity metadata for |
63573e35 | 165 | * @proc_iter: iterator to process |
18593088 | 166 | * @proc_fn: Pointer to the relevant processing function |
7ba1ba12 | 167 | */ |
4e4cbee9 | 168 | static blk_status_t bio_integrity_process(struct bio *bio, |
63573e35 | 169 | struct bvec_iter *proc_iter, integrity_processing_fn *proc_fn) |
7ba1ba12 | 170 | { |
74d46992 | 171 | struct blk_integrity *bi = blk_get_integrity(bio->bi_disk); |
18593088 | 172 | struct blk_integrity_iter iter; |
594416a7 DW |
173 | struct bvec_iter bviter; |
174 | struct bio_vec bv; | |
5f9378fa | 175 | struct bio_integrity_payload *bip = bio_integrity(bio); |
4e4cbee9 | 176 | blk_status_t ret = BLK_STS_OK; |
5f9378fa MP |
177 | void *prot_buf = page_address(bip->bip_vec->bv_page) + |
178 | bip->bip_vec->bv_offset; | |
7ba1ba12 | 179 | |
74d46992 | 180 | iter.disk_name = bio->bi_disk->disk_name; |
a48f041d | 181 | iter.interval = 1 << bi->interval_exp; |
63573e35 | 182 | iter.seed = proc_iter->bi_sector; |
18593088 | 183 | iter.prot_buf = prot_buf; |
7ba1ba12 | 184 | |
63573e35 | 185 | __bio_for_each_segment(bv, bio, bviter, *proc_iter) { |
594416a7 | 186 | void *kaddr = kmap_atomic(bv.bv_page); |
7ba1ba12 | 187 | |
594416a7 DW |
188 | iter.data_buf = kaddr + bv.bv_offset; |
189 | iter.data_size = bv.bv_len; | |
18593088 MP |
190 | |
191 | ret = proc_fn(&iter); | |
192 | if (ret) { | |
193 | kunmap_atomic(kaddr); | |
194 | return ret; | |
195 | } | |
7ba1ba12 | 196 | |
e8e3c3d6 | 197 | kunmap_atomic(kaddr); |
7ba1ba12 | 198 | } |
bf36f9cf GZ |
199 | return ret; |
200 | } | |
201 | ||
7ba1ba12 MP |
202 | /** |
203 | * bio_integrity_prep - Prepare bio for integrity I/O | |
204 | * @bio: bio to prepare | |
205 | * | |
e23947bd DM |
206 | * Description: Checks if the bio already has an integrity payload attached. |
207 | * If it does, the payload has been generated by another kernel subsystem, | |
208 | * and we just pass it through. Otherwise allocates integrity payload. | |
209 | * The bio must have data direction, target device and start sector set priot | |
210 | * to calling. In the WRITE case, integrity metadata will be generated using | |
211 | * the block device's integrity function. In the READ case, the buffer | |
7ba1ba12 MP |
212 | * will be prepared for DMA and a suitable end_io handler set up. |
213 | */ | |
e23947bd | 214 | bool bio_integrity_prep(struct bio *bio) |
7ba1ba12 MP |
215 | { |
216 | struct bio_integrity_payload *bip; | |
74d46992 CH |
217 | struct blk_integrity *bi = blk_get_integrity(bio->bi_disk); |
218 | struct request_queue *q = bio->bi_disk->queue; | |
7ba1ba12 MP |
219 | void *buf; |
220 | unsigned long start, end; | |
221 | unsigned int len, nr_pages; | |
222 | unsigned int bytes, offset, i; | |
3be91c4a | 223 | unsigned int intervals; |
e23947bd | 224 | blk_status_t status; |
7ba1ba12 | 225 | |
9346beb9 CH |
226 | if (!bi) |
227 | return true; | |
228 | ||
e23947bd DM |
229 | if (bio_op(bio) != REQ_OP_READ && bio_op(bio) != REQ_OP_WRITE) |
230 | return true; | |
231 | ||
232 | if (!bio_sectors(bio)) | |
233 | return true; | |
7ba1ba12 | 234 | |
e23947bd DM |
235 | /* Already protected? */ |
236 | if (bio_integrity(bio)) | |
237 | return true; | |
238 | ||
e23947bd DM |
239 | if (bio_data_dir(bio) == READ) { |
240 | if (!bi->profile->verify_fn || | |
241 | !(bi->flags & BLK_INTEGRITY_VERIFY)) | |
242 | return true; | |
243 | } else { | |
244 | if (!bi->profile->generate_fn || | |
245 | !(bi->flags & BLK_INTEGRITY_GENERATE)) | |
246 | return true; | |
247 | } | |
3be91c4a | 248 | intervals = bio_integrity_intervals(bi, bio_sectors(bio)); |
7ba1ba12 MP |
249 | |
250 | /* Allocate kernel buffer for protection data */ | |
3be91c4a | 251 | len = intervals * bi->tuple_size; |
72f46503 | 252 | buf = kmalloc(len, GFP_NOIO | q->bounce_gfp); |
e23947bd | 253 | status = BLK_STS_RESOURCE; |
7ba1ba12 MP |
254 | if (unlikely(buf == NULL)) { |
255 | printk(KERN_ERR "could not allocate integrity buffer\n"); | |
e23947bd | 256 | goto err_end_io; |
7ba1ba12 MP |
257 | } |
258 | ||
259 | end = (((unsigned long) buf) + len + PAGE_SIZE - 1) >> PAGE_SHIFT; | |
260 | start = ((unsigned long) buf) >> PAGE_SHIFT; | |
261 | nr_pages = end - start; | |
262 | ||
263 | /* Allocate bio integrity payload and integrity vectors */ | |
264 | bip = bio_integrity_alloc(bio, GFP_NOIO, nr_pages); | |
7b6c0f80 | 265 | if (IS_ERR(bip)) { |
7ba1ba12 MP |
266 | printk(KERN_ERR "could not allocate data integrity bioset\n"); |
267 | kfree(buf); | |
e23947bd DM |
268 | status = BLK_STS_RESOURCE; |
269 | goto err_end_io; | |
7ba1ba12 MP |
270 | } |
271 | ||
b1f01388 | 272 | bip->bip_flags |= BIP_BLOCK_INTEGRITY; |
d57a5f7c | 273 | bip->bip_iter.bi_size = len; |
18593088 | 274 | bip_set_seed(bip, bio->bi_iter.bi_sector); |
7ba1ba12 | 275 | |
aae7df50 MP |
276 | if (bi->flags & BLK_INTEGRITY_IP_CHECKSUM) |
277 | bip->bip_flags |= BIP_IP_CHECKSUM; | |
278 | ||
7ba1ba12 MP |
279 | /* Map it */ |
280 | offset = offset_in_page(buf); | |
281 | for (i = 0 ; i < nr_pages ; i++) { | |
282 | int ret; | |
283 | bytes = PAGE_SIZE - offset; | |
284 | ||
285 | if (len <= 0) | |
286 | break; | |
287 | ||
288 | if (bytes > len) | |
289 | bytes = len; | |
290 | ||
291 | ret = bio_integrity_add_page(bio, virt_to_page(buf), | |
292 | bytes, offset); | |
293 | ||
294 | if (ret == 0) | |
ea4d12da | 295 | return false; |
7ba1ba12 MP |
296 | |
297 | if (ret < bytes) | |
298 | break; | |
299 | ||
300 | buf += bytes; | |
301 | len -= bytes; | |
302 | offset = 0; | |
303 | } | |
304 | ||
7ba1ba12 | 305 | /* Auto-generate integrity metadata if this is a write */ |
63573e35 DM |
306 | if (bio_data_dir(bio) == WRITE) { |
307 | bio_integrity_process(bio, &bio->bi_iter, | |
308 | bi->profile->generate_fn); | |
7759eb23 ML |
309 | } else { |
310 | bip->bio_iter = bio->bi_iter; | |
63573e35 | 311 | } |
e23947bd DM |
312 | return true; |
313 | ||
314 | err_end_io: | |
315 | bio->bi_status = status; | |
316 | bio_endio(bio); | |
317 | return false; | |
7ba1ba12 | 318 | |
7ba1ba12 MP |
319 | } |
320 | EXPORT_SYMBOL(bio_integrity_prep); | |
321 | ||
7ba1ba12 MP |
322 | /** |
323 | * bio_integrity_verify_fn - Integrity I/O completion worker | |
324 | * @work: Work struct stored in bio to be verified | |
325 | * | |
326 | * Description: This workqueue function is called to complete a READ | |
327 | * request. The function verifies the transferred integrity metadata | |
328 | * and then calls the original bio end_io function. | |
329 | */ | |
330 | static void bio_integrity_verify_fn(struct work_struct *work) | |
331 | { | |
b984679e | 332 | struct bio_integrity_payload *bip = |
7ba1ba12 MP |
333 | container_of(work, struct bio_integrity_payload, bip_work); |
334 | struct bio *bio = bip->bip_bio; | |
74d46992 | 335 | struct blk_integrity *bi = blk_get_integrity(bio->bi_disk); |
63573e35 DM |
336 | |
337 | /* | |
338 | * At the moment verify is called bio's iterator was advanced | |
339 | * during split and completion, we need to rewind iterator to | |
340 | * it's original position. | |
341 | */ | |
7759eb23 ML |
342 | bio->bi_status = bio_integrity_process(bio, &bip->bio_iter, |
343 | bi->profile->verify_fn); | |
7c20f116 | 344 | bio_integrity_free(bio); |
4246a0b6 | 345 | bio_endio(bio); |
7ba1ba12 MP |
346 | } |
347 | ||
348 | /** | |
7c20f116 | 349 | * __bio_integrity_endio - Integrity I/O completion function |
7ba1ba12 | 350 | * @bio: Protected bio |
7ba1ba12 MP |
351 | * |
352 | * Description: Completion for integrity I/O | |
353 | * | |
354 | * Normally I/O completion is done in interrupt context. However, | |
355 | * verifying I/O integrity is a time-consuming task which must be run | |
356 | * in process context. This function postpones completion | |
357 | * accordingly. | |
358 | */ | |
7c20f116 | 359 | bool __bio_integrity_endio(struct bio *bio) |
7ba1ba12 | 360 | { |
97e05463 | 361 | struct blk_integrity *bi = blk_get_integrity(bio->bi_disk); |
f86e28c4 | 362 | struct bio_integrity_payload *bip = bio_integrity(bio); |
c775d209 MB |
363 | |
364 | if (bio_op(bio) == REQ_OP_READ && !bio->bi_status && | |
f86e28c4 | 365 | (bip->bip_flags & BIP_BLOCK_INTEGRITY) && bi->profile->verify_fn) { |
7c20f116 CH |
366 | INIT_WORK(&bip->bip_work, bio_integrity_verify_fn); |
367 | queue_work(kintegrityd_wq, &bip->bip_work); | |
368 | return false; | |
7b24fc4d MP |
369 | } |
370 | ||
7c20f116 CH |
371 | bio_integrity_free(bio); |
372 | return true; | |
7ba1ba12 | 373 | } |
7ba1ba12 | 374 | |
7ba1ba12 MP |
375 | /** |
376 | * bio_integrity_advance - Advance integrity vector | |
377 | * @bio: bio whose integrity vector to update | |
378 | * @bytes_done: number of data bytes that have been completed | |
379 | * | |
380 | * Description: This function calculates how many integrity bytes the | |
381 | * number of completed data bytes correspond to and advances the | |
382 | * integrity vector accordingly. | |
383 | */ | |
384 | void bio_integrity_advance(struct bio *bio, unsigned int bytes_done) | |
385 | { | |
180b2f95 | 386 | struct bio_integrity_payload *bip = bio_integrity(bio); |
74d46992 | 387 | struct blk_integrity *bi = blk_get_integrity(bio->bi_disk); |
d57a5f7c | 388 | unsigned bytes = bio_integrity_bytes(bi, bytes_done >> 9); |
7ba1ba12 | 389 | |
309a62fa | 390 | bip->bip_iter.bi_sector += bytes_done >> 9; |
d57a5f7c | 391 | bvec_iter_advance(bip->bip_vec, &bip->bip_iter, bytes); |
7ba1ba12 | 392 | } |
7ba1ba12 MP |
393 | |
394 | /** | |
395 | * bio_integrity_trim - Trim integrity vector | |
396 | * @bio: bio whose integrity vector to update | |
7ba1ba12 MP |
397 | * |
398 | * Description: Used to trim the integrity vector in a cloned bio. | |
7ba1ba12 | 399 | */ |
fbd08e76 | 400 | void bio_integrity_trim(struct bio *bio) |
7ba1ba12 | 401 | { |
180b2f95 | 402 | struct bio_integrity_payload *bip = bio_integrity(bio); |
74d46992 | 403 | struct blk_integrity *bi = blk_get_integrity(bio->bi_disk); |
7ba1ba12 | 404 | |
fbd08e76 | 405 | bip->bip_iter.bi_size = bio_integrity_bytes(bi, bio_sectors(bio)); |
7ba1ba12 MP |
406 | } |
407 | EXPORT_SYMBOL(bio_integrity_trim); | |
408 | ||
7ba1ba12 MP |
409 | /** |
410 | * bio_integrity_clone - Callback for cloning bios with integrity metadata | |
411 | * @bio: New bio | |
412 | * @bio_src: Original bio | |
87092698 | 413 | * @gfp_mask: Memory allocation mask |
7ba1ba12 MP |
414 | * |
415 | * Description: Called to allocate a bip when cloning a bio | |
416 | */ | |
7878cba9 | 417 | int bio_integrity_clone(struct bio *bio, struct bio *bio_src, |
1e2a410f | 418 | gfp_t gfp_mask) |
7ba1ba12 | 419 | { |
180b2f95 | 420 | struct bio_integrity_payload *bip_src = bio_integrity(bio_src); |
7ba1ba12 MP |
421 | struct bio_integrity_payload *bip; |
422 | ||
423 | BUG_ON(bip_src == NULL); | |
424 | ||
1e2a410f | 425 | bip = bio_integrity_alloc(bio, gfp_mask, bip_src->bip_vcnt); |
7b6c0f80 DC |
426 | if (IS_ERR(bip)) |
427 | return PTR_ERR(bip); | |
7ba1ba12 MP |
428 | |
429 | memcpy(bip->bip_vec, bip_src->bip_vec, | |
430 | bip_src->bip_vcnt * sizeof(struct bio_vec)); | |
431 | ||
7ba1ba12 | 432 | bip->bip_vcnt = bip_src->bip_vcnt; |
d57a5f7c | 433 | bip->bip_iter = bip_src->bip_iter; |
7ba1ba12 MP |
434 | |
435 | return 0; | |
436 | } | |
437 | EXPORT_SYMBOL(bio_integrity_clone); | |
438 | ||
7878cba9 | 439 | int bioset_integrity_create(struct bio_set *bs, int pool_size) |
7ba1ba12 | 440 | { |
8aa6ba2f | 441 | if (mempool_initialized(&bs->bio_integrity_pool)) |
a91a2785 MP |
442 | return 0; |
443 | ||
8aa6ba2f KO |
444 | if (mempool_init_slab_pool(&bs->bio_integrity_pool, |
445 | pool_size, bip_slab)) | |
9f060e22 | 446 | return -1; |
7ba1ba12 | 447 | |
8aa6ba2f KO |
448 | if (biovec_init_pool(&bs->bvec_integrity_pool, pool_size)) { |
449 | mempool_exit(&bs->bio_integrity_pool); | |
7878cba9 | 450 | return -1; |
bc5c8f07 | 451 | } |
7878cba9 MP |
452 | |
453 | return 0; | |
454 | } | |
455 | EXPORT_SYMBOL(bioset_integrity_create); | |
456 | ||
457 | void bioset_integrity_free(struct bio_set *bs) | |
458 | { | |
8aa6ba2f KO |
459 | mempool_exit(&bs->bio_integrity_pool); |
460 | mempool_exit(&bs->bvec_integrity_pool); | |
7878cba9 | 461 | } |
7878cba9 MP |
462 | |
463 | void __init bio_integrity_init(void) | |
464 | { | |
a6e8dc46 TH |
465 | /* |
466 | * kintegrityd won't block much but may burn a lot of CPU cycles. | |
467 | * Make it highpri CPU intensive wq with max concurrency of 1. | |
468 | */ | |
469 | kintegrityd_wq = alloc_workqueue("kintegrityd", WQ_MEM_RECLAIM | | |
470 | WQ_HIGHPRI | WQ_CPU_INTENSIVE, 1); | |
6d2a78e7 MP |
471 | if (!kintegrityd_wq) |
472 | panic("Failed to create kintegrityd\n"); | |
7ba1ba12 | 473 | |
9f060e22 KO |
474 | bip_slab = kmem_cache_create("bio_integrity_payload", |
475 | sizeof(struct bio_integrity_payload) + | |
476 | sizeof(struct bio_vec) * BIP_INLINE_VECS, | |
477 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL); | |
7ba1ba12 | 478 | } |