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block: Replace bi_integrity with bi_special

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For commands like REQ_COPY we need a way to pass extra information along
with each bio. Like integrity metadata this information must be
available at the bottom of the stack so bi_private does not suffice.

Rename the existing bi_integrity field to bi_special and make it a union
so we can have different bio extensions for each class of command.

We previously used bi_integrity != NULL as a way to identify whether a
bio had integrity metadata or not. Introduce a REQ_INTEGRITY to be the
indicator now that bi_special can contain different things.

In addition, bio_integrity(bio) will now return a pointer to the
integrity payload (when applicable).

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Martin K. Petersen
2014-09-26 19:19:56 -04:00
committed by Jens Axboe
parent e7258c1a26
commit 180b2f95dd
6 changed files with 36 additions and 27 deletions
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8
drivers/scsi/sd_dif.c
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@@ -383,9 +383,9 @@ void sd_dif_prepare(struct request *rq, sector_t hw_sector,
if (bio_flagged(bio, BIO_MAPPED_INTEGRITY))
break;
virt = bio->bi_integrity->bip_iter.bi_sector & 0xffffffff;
virt = bio_integrity(bio)->bip_iter.bi_sector & 0xffffffff;
bip_for_each_vec(iv, bio->bi_integrity, iter) {
bip_for_each_vec(iv, bio_integrity(bio), iter) {
sdt = kmap_atomic(iv.bv_page)
+ iv.bv_offset;
@@ -434,9 +434,9 @@ void sd_dif_complete(struct scsi_cmnd *scmd, unsigned int good_bytes)
struct bio_vec iv;
struct bvec_iter iter;
virt = bio->bi_integrity->bip_iter.bi_sector & 0xffffffff;
virt = bio_integrity(bio)->bip_iter.bi_sector & 0xffffffff;
bip_for_each_vec(iv, bio->bi_integrity, iter) {
bip_for_each_vec(iv, bio_integrity(bio), iter) {
sdt = kmap_atomic(iv.bv_page)
+ iv.bv_offset;