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path: root/drivers/scsi/sd_dif.c
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Diffstat (limited to 'drivers/scsi/sd_dif.c')
-rw-r--r--drivers/scsi/sd_dif.c113
1 files changed, 0 insertions, 113 deletions
diff --git a/drivers/scsi/sd_dif.c b/drivers/scsi/sd_dif.c
index 9035380c0dda..db72c82486e3 100644
--- a/drivers/scsi/sd_dif.c
+++ b/drivers/scsi/sd_dif.c
@@ -95,116 +95,3 @@ out:
blk_integrity_register(disk, &bi);
}
-/*
- * The virtual start sector is the one that was originally submitted
- * by the block layer. Due to partitioning, MD/DM cloning, etc. the
- * actual physical start sector is likely to be different. Remap
- * protection information to match the physical LBA.
- *
- * From a protocol perspective there's a slight difference between
- * Type 1 and 2. The latter uses 32-byte CDBs exclusively, and the
- * reference tag is seeded in the CDB. This gives us the potential to
- * avoid virt->phys remapping during write. However, at read time we
- * don't know whether the virt sector is the same as when we wrote it
- * (we could be reading from real disk as opposed to MD/DM device. So
- * we always remap Type 2 making it identical to Type 1.
- *
- * Type 3 does not have a reference tag so no remapping is required.
- */
-void sd_dif_prepare(struct scsi_cmnd *scmd)
-{
- const int tuple_sz = sizeof(struct t10_pi_tuple);
- struct bio *bio;
- struct scsi_disk *sdkp;
- struct t10_pi_tuple *pi;
- u32 phys, virt;
-
- sdkp = scsi_disk(scmd->request->rq_disk);
-
- if (sdkp->protection_type == T10_PI_TYPE3_PROTECTION)
- return;
-
- phys = scsi_prot_ref_tag(scmd);
-
- __rq_for_each_bio(bio, scmd->request) {
- struct bio_integrity_payload *bip = bio_integrity(bio);
- struct bio_vec iv;
- struct bvec_iter iter;
- unsigned int j;
-
- /* Already remapped? */
- if (bip->bip_flags & BIP_MAPPED_INTEGRITY)
- break;
-
- virt = bip_get_seed(bip) & 0xffffffff;
-
- bip_for_each_vec(iv, bip, iter) {
- pi = kmap_atomic(iv.bv_page) + iv.bv_offset;
-
- for (j = 0; j < iv.bv_len; j += tuple_sz, pi++) {
-
- if (be32_to_cpu(pi->ref_tag) == virt)
- pi->ref_tag = cpu_to_be32(phys);
-
- virt++;
- phys++;
- }
-
- kunmap_atomic(pi);
- }
-
- bip->bip_flags |= BIP_MAPPED_INTEGRITY;
- }
-}
-
-/*
- * Remap physical sector values in the reference tag to the virtual
- * values expected by the block layer.
- */
-void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes)
-{
- const int tuple_sz = sizeof(struct t10_pi_tuple);
- struct scsi_disk *sdkp;
- struct bio *bio;
- struct t10_pi_tuple *pi;
- unsigned int j, intervals;
- u32 phys, virt;
-
- sdkp = scsi_disk(scmd->request->rq_disk);
-
- if (sdkp->protection_type == T10_PI_TYPE3_PROTECTION || good_bytes == 0)
- return;
-
- intervals = good_bytes / scsi_prot_interval(scmd);
- phys = scsi_prot_ref_tag(scmd);
-
- __rq_for_each_bio(bio, scmd->request) {
- struct bio_integrity_payload *bip = bio_integrity(bio);
- struct bio_vec iv;
- struct bvec_iter iter;
-
- virt = bip_get_seed(bip) & 0xffffffff;
-
- bip_for_each_vec(iv, bip, iter) {
- pi = kmap_atomic(iv.bv_page) + iv.bv_offset;
-
- for (j = 0; j < iv.bv_len; j += tuple_sz, pi++) {
-
- if (intervals == 0) {
- kunmap_atomic(pi);
- return;
- }
-
- if (be32_to_cpu(pi->ref_tag) == phys)
- pi->ref_tag = cpu_to_be32(virt);
-
- virt++;
- phys++;
- intervals--;
- }
-
- kunmap_atomic(pi);
- }
- }
-}
-