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281 lines
7.7 KiB
281 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* t10_pi.c - Functions for generating and verifying T10 Protection |
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* Information. |
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*/ |
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#include <linux/t10-pi.h> |
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#include <linux/blkdev.h> |
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#include <linux/crc-t10dif.h> |
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#include <linux/module.h> |
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#include <net/checksum.h> |
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typedef __be16 (csum_fn) (void *, unsigned int); |
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static __be16 t10_pi_crc_fn(void *data, unsigned int len) |
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{ |
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return cpu_to_be16(crc_t10dif(data, len)); |
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} |
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static __be16 t10_pi_ip_fn(void *data, unsigned int len) |
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{ |
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return (__force __be16)ip_compute_csum(data, len); |
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} |
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/* |
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* Type 1 and Type 2 protection use the same format: 16 bit guard tag, |
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* 16 bit app tag, 32 bit reference tag. Type 3 does not define the ref |
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* tag. |
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*/ |
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static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter, |
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csum_fn *fn, enum t10_dif_type type) |
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{ |
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unsigned int i; |
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for (i = 0 ; i < iter->data_size ; i += iter->interval) { |
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struct t10_pi_tuple *pi = iter->prot_buf; |
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pi->guard_tag = fn(iter->data_buf, iter->interval); |
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pi->app_tag = 0; |
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if (type == T10_PI_TYPE1_PROTECTION) |
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pi->ref_tag = cpu_to_be32(lower_32_bits(iter->seed)); |
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else |
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pi->ref_tag = 0; |
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iter->data_buf += iter->interval; |
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iter->prot_buf += sizeof(struct t10_pi_tuple); |
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iter->seed++; |
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} |
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return BLK_STS_OK; |
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} |
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static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter, |
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csum_fn *fn, enum t10_dif_type type) |
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{ |
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unsigned int i; |
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BUG_ON(type == T10_PI_TYPE0_PROTECTION); |
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for (i = 0 ; i < iter->data_size ; i += iter->interval) { |
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struct t10_pi_tuple *pi = iter->prot_buf; |
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__be16 csum; |
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if (type == T10_PI_TYPE1_PROTECTION || |
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type == T10_PI_TYPE2_PROTECTION) { |
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if (pi->app_tag == T10_PI_APP_ESCAPE) |
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goto next; |
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if (be32_to_cpu(pi->ref_tag) != |
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lower_32_bits(iter->seed)) { |
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pr_err("%s: ref tag error at location %llu " \ |
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"(rcvd %u)\n", iter->disk_name, |
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(unsigned long long) |
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iter->seed, be32_to_cpu(pi->ref_tag)); |
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return BLK_STS_PROTECTION; |
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} |
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} else if (type == T10_PI_TYPE3_PROTECTION) { |
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if (pi->app_tag == T10_PI_APP_ESCAPE && |
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pi->ref_tag == T10_PI_REF_ESCAPE) |
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goto next; |
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} |
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csum = fn(iter->data_buf, iter->interval); |
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if (pi->guard_tag != csum) { |
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pr_err("%s: guard tag error at sector %llu " \ |
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"(rcvd %04x, want %04x)\n", iter->disk_name, |
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(unsigned long long)iter->seed, |
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be16_to_cpu(pi->guard_tag), be16_to_cpu(csum)); |
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return BLK_STS_PROTECTION; |
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} |
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next: |
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iter->data_buf += iter->interval; |
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iter->prot_buf += sizeof(struct t10_pi_tuple); |
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iter->seed++; |
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} |
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return BLK_STS_OK; |
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} |
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static blk_status_t t10_pi_type1_generate_crc(struct blk_integrity_iter *iter) |
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{ |
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return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE1_PROTECTION); |
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} |
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static blk_status_t t10_pi_type1_generate_ip(struct blk_integrity_iter *iter) |
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{ |
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return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE1_PROTECTION); |
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} |
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static blk_status_t t10_pi_type1_verify_crc(struct blk_integrity_iter *iter) |
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{ |
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return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE1_PROTECTION); |
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} |
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static blk_status_t t10_pi_type1_verify_ip(struct blk_integrity_iter *iter) |
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{ |
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return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE1_PROTECTION); |
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} |
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/** |
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* t10_pi_type1_prepare - prepare PI prior submitting request to device |
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* @rq: request with PI that should be prepared |
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* |
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* For Type 1/Type 2, the virtual start sector is the one that was |
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* originally submitted by the block layer for the ref_tag usage. Due to |
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* partitioning, MD/DM cloning, etc. the actual physical start sector is |
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* likely to be different. Remap protection information to match the |
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* physical LBA. |
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*/ |
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static void t10_pi_type1_prepare(struct request *rq) |
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{ |
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const int tuple_sz = rq->q->integrity.tuple_size; |
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u32 ref_tag = t10_pi_ref_tag(rq); |
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struct bio *bio; |
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__rq_for_each_bio(bio, rq) { |
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struct bio_integrity_payload *bip = bio_integrity(bio); |
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u32 virt = bip_get_seed(bip) & 0xffffffff; |
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struct bio_vec iv; |
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struct bvec_iter iter; |
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/* Already remapped? */ |
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if (bip->bip_flags & BIP_MAPPED_INTEGRITY) |
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break; |
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bip_for_each_vec(iv, bip, iter) { |
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unsigned int j; |
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void *p; |
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p = bvec_kmap_local(&iv); |
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for (j = 0; j < iv.bv_len; j += tuple_sz) { |
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struct t10_pi_tuple *pi = p; |
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if (be32_to_cpu(pi->ref_tag) == virt) |
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pi->ref_tag = cpu_to_be32(ref_tag); |
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virt++; |
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ref_tag++; |
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p += tuple_sz; |
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} |
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kunmap_local(p); |
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} |
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bip->bip_flags |= BIP_MAPPED_INTEGRITY; |
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} |
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} |
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/** |
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* t10_pi_type1_complete - prepare PI prior returning request to the blk layer |
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* @rq: request with PI that should be prepared |
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* @nr_bytes: total bytes to prepare |
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* |
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* For Type 1/Type 2, the virtual start sector is the one that was |
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* originally submitted by the block layer for the ref_tag usage. Due to |
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* partitioning, MD/DM cloning, etc. the actual physical start sector is |
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* likely to be different. Since the physical start sector was submitted |
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* to the device, we should remap it back to virtual values expected by the |
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* block layer. |
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*/ |
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static void t10_pi_type1_complete(struct request *rq, unsigned int nr_bytes) |
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{ |
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unsigned intervals = nr_bytes >> rq->q->integrity.interval_exp; |
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const int tuple_sz = rq->q->integrity.tuple_size; |
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u32 ref_tag = t10_pi_ref_tag(rq); |
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struct bio *bio; |
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__rq_for_each_bio(bio, rq) { |
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struct bio_integrity_payload *bip = bio_integrity(bio); |
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u32 virt = bip_get_seed(bip) & 0xffffffff; |
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struct bio_vec iv; |
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struct bvec_iter iter; |
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bip_for_each_vec(iv, bip, iter) { |
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unsigned int j; |
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void *p; |
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p = bvec_kmap_local(&iv); |
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for (j = 0; j < iv.bv_len && intervals; j += tuple_sz) { |
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struct t10_pi_tuple *pi = p; |
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if (be32_to_cpu(pi->ref_tag) == ref_tag) |
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pi->ref_tag = cpu_to_be32(virt); |
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virt++; |
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ref_tag++; |
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intervals--; |
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p += tuple_sz; |
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} |
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kunmap_local(p); |
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} |
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} |
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} |
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static blk_status_t t10_pi_type3_generate_crc(struct blk_integrity_iter *iter) |
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{ |
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return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION); |
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} |
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static blk_status_t t10_pi_type3_generate_ip(struct blk_integrity_iter *iter) |
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{ |
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return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION); |
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} |
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static blk_status_t t10_pi_type3_verify_crc(struct blk_integrity_iter *iter) |
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{ |
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return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION); |
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} |
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static blk_status_t t10_pi_type3_verify_ip(struct blk_integrity_iter *iter) |
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{ |
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return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION); |
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} |
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/* Type 3 does not have a reference tag so no remapping is required. */ |
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static void t10_pi_type3_prepare(struct request *rq) |
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{ |
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} |
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/* Type 3 does not have a reference tag so no remapping is required. */ |
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static void t10_pi_type3_complete(struct request *rq, unsigned int nr_bytes) |
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{ |
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} |
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const struct blk_integrity_profile t10_pi_type1_crc = { |
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.name = "T10-DIF-TYPE1-CRC", |
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.generate_fn = t10_pi_type1_generate_crc, |
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.verify_fn = t10_pi_type1_verify_crc, |
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.prepare_fn = t10_pi_type1_prepare, |
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.complete_fn = t10_pi_type1_complete, |
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}; |
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EXPORT_SYMBOL(t10_pi_type1_crc); |
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const struct blk_integrity_profile t10_pi_type1_ip = { |
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.name = "T10-DIF-TYPE1-IP", |
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.generate_fn = t10_pi_type1_generate_ip, |
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.verify_fn = t10_pi_type1_verify_ip, |
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.prepare_fn = t10_pi_type1_prepare, |
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.complete_fn = t10_pi_type1_complete, |
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}; |
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EXPORT_SYMBOL(t10_pi_type1_ip); |
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const struct blk_integrity_profile t10_pi_type3_crc = { |
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.name = "T10-DIF-TYPE3-CRC", |
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.generate_fn = t10_pi_type3_generate_crc, |
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.verify_fn = t10_pi_type3_verify_crc, |
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.prepare_fn = t10_pi_type3_prepare, |
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.complete_fn = t10_pi_type3_complete, |
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}; |
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EXPORT_SYMBOL(t10_pi_type3_crc); |
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const struct blk_integrity_profile t10_pi_type3_ip = { |
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.name = "T10-DIF-TYPE3-IP", |
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.generate_fn = t10_pi_type3_generate_ip, |
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.verify_fn = t10_pi_type3_verify_ip, |
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.prepare_fn = t10_pi_type3_prepare, |
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.complete_fn = t10_pi_type3_complete, |
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}; |
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EXPORT_SYMBOL(t10_pi_type3_ip); |
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MODULE_LICENSE("GPL");
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