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block: Reduce the size of struct blk_integrity

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The per-device properties in the blk_integrity structure were previously
unsigned short. However, most of the values fit inside a char. The only
exception is the data interval size and we can work around that by
storing it as a power of two.

This cuts the size of the dynamic portion of blk_integrity in half.

Signed-off-by: Martin K. Petersen <[email protected]>
Reported-by: Christoph Hellwig <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Martin K. Petersen 2015-10-21 13:19:38 -04:00 • committed by Jens Axboe
commit a48f041d91
3 changed files with 9 additions and 9 deletions
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4
block/bio-integrity.c
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@ -202,7 +202,7 @@ EXPORT_SYMBOL(bio_integrity_enabled);
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
unsigned int sectors)
{
return sectors >> (ilog2(bi->interval) - 9);
return sectors >> (bi->interval_exp - 9);
}
static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
@ -229,7 +229,7 @@ static int bio_integrity_process(struct bio *bio,
bip->bip_vec->bv_offset;
iter.disk_name = bio->bi_bdev->bd_disk->disk_name;
iter.interval = bi->interval;
iter.interval = 1 << bi->interval_exp;
iter.seed = bip_get_seed(bip);
iter.prot_buf = prot_buf;