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block: Make the integrity mapped property a bio flag

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Previously we tracked whether the integrity metadata had been remapped
using a request flag. This was fine for low-level retries. However, if
an I/O was redriven by upper layers we would end up remapping again,
causing the retry to fail.

Deprecate the REQ_INTEGRITY flag and introduce BIO_MAPPED_INTEGRITY
which enables filesystems to notify lower layers that the bio in
question has already been remapped.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Martin K. Petersen
2010-10-15 15:49:20 +02:00
committed by Jens Axboe
parent e817bf3f68
commit 495d2b3883
2 changed files with 7 additions and 7 deletions
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11
drivers/scsi/sd_dif.c
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@@ -375,21 +375,20 @@ int sd_dif_prepare(struct request *rq, sector_t hw_sector, unsigned int sector_s
unsigned int i, j;
u32 phys, virt;
/* Already remapped? */
if (rq->cmd_flags & REQ_INTEGRITY)
return 0;
sdkp = rq->bio->bi_bdev->bd_disk->private_data;
if (sdkp->protection_type == SD_DIF_TYPE3_PROTECTION)
return 0;
rq->cmd_flags |= REQ_INTEGRITY;
phys = hw_sector & 0xffffffff;
__rq_for_each_bio(bio, rq) {
struct bio_vec *iv;
/* Already remapped? */
if (bio_flagged(bio, BIO_MAPPED_INTEGRITY))
break;
virt = bio->bi_integrity->bip_sector & 0xffffffff;
bip_for_each_vec(iv, bio->bi_integrity, i) {
@@ -408,6 +407,8 @@ int sd_dif_prepare(struct request *rq, sector_t hw_sector, unsigned int sector_s
kunmap_atomic(sdt, KM_USER0);
}
bio->bi_flags |= BIO_MAPPED_INTEGRITY;
}
return 0;