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block, libnvdimm, nvme: provide a built-in blk_integrity nop profile

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The libnvidmm-btt and nvme drivers use blk_integrity to reserve space
for per-sector metadata, but sometimes without protection checksums.
This property is generically useful, so teach the block core to
internally specify a nop profile if one is not provided at registration
time.

Cc: Keith Busch <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Suggested-by: Christoph Hellwig <[email protected]>
[hch: kill the local nvme nop profile as well]
Acked-by: Martin K. Petersen <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Dan Williams 2015-10-21 13:20:29 -04:00 • committed by Jens Axboe
commit 4125a09b0a
3 changed files with 14 additions and 29 deletions
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13
block/blk-integrity.c
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@ -384,6 +384,17 @@ static struct kobj_type integrity_ktype = {
.sysfs_ops = &integrity_ops,
};
static int blk_integrity_nop_fn(struct blk_integrity_iter *iter)
{
return 0;
}
static struct blk_integrity_profile nop_profile = {
.name = "nop",
.generate_fn = blk_integrity_nop_fn,
.verify_fn = blk_integrity_nop_fn,
};
/**
* blk_integrity_register - Register a gendisk as being integrity-capable
* @disk: struct gendisk pointer to make integrity-aware
@ -402,7 +413,7 @@ void blk_integrity_register(struct gendisk *disk, struct blk_integrity *template
bi->flags = BLK_INTEGRITY_VERIFY | BLK_INTEGRITY_GENERATE |
template->flags;
bi->interval_exp = ilog2(queue_logical_block_size(disk->queue));
bi->profile = template->profile;
bi->profile = template->profile ? template->profile : &nop_profile;
bi->tuple_size = template->tuple_size;
bi->tag_size = template->tag_size;