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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 <martin.petersen@oracle.com>
Reported-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Martin K. Petersen 2015-10-21 13:19:38 -04:00 committed by Jens Axboe
parent 0f8087ecde
commit a48f041d91
3 changed files with 9 additions and 9 deletions
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4
block/bio-integrity.c
View file

@ -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;

6
block/blk-integrity.c
View file

@ -155,10 +155,10 @@ int blk_integrity_compare(struct gendisk *gd1, struct gendisk *gd2)
if (!b1 || !b2)
return -1;
if (b1->interval != b2->interval) {
if (b1->interval_exp != b2->interval_exp) {
pr_err("%s: %s/%s protection interval %u != %u\n",
__func__, gd1->disk_name, gd2->disk_name,
b1->interval, b2->interval);
1 << b1->interval_exp, 1 << b2->interval_exp);
return -1;
}
@ -440,7 +440,7 @@ int blk_integrity_register(struct gendisk *disk, struct blk_integrity *template)
kobject_uevent(&disk->integrity_kobj, KOBJ_ADD);
bi->flags |= BLK_INTEGRITY_VERIFY | BLK_INTEGRITY_GENERATE;
bi->interval = queue_logical_block_size(disk->queue);
bi->interval_exp = ilog2(queue_logical_block_size(disk->queue));
disk->integrity = bi;
} else
bi = disk->integrity;

8
include/linux/blkdev.h
View file

@ -1470,10 +1470,10 @@ struct blk_integrity_profile {
struct blk_integrity {
struct blk_integrity_profile *profile;
unsigned short flags;
unsigned short tuple_size;
unsigned short interval;
unsigned short tag_size;
unsigned char flags;
unsigned char tuple_size;
unsigned char interval_exp;
unsigned char tag_size;
};
extern bool blk_integrity_is_initialized(struct gendisk *);