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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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8
include/linux/blkdev.h
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@ -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 *);