From 4125a09b0a0d579ebace17f0e62b03ab9d5ab2f4 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Wed, 21 Oct 2015 13:20:29 -0400 Subject: block, libnvdimm, nvme: provide a built-in blk_integrity nop profile 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 Cc: Matthew Wilcox Suggested-by: Christoph Hellwig [hch: kill the local nvme nop profile as well] Acked-by: Martin K. Petersen Signed-off-by: Dan Williams Signed-off-by: Jens Axboe --- block/blk-integrity.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'block/blk-integrity.c') diff --git a/block/blk-integrity.c b/block/blk-integrity.c index 5d339ae64d563..d69c5c79f98e7 100644 --- a/block/blk-integrity.c +++ b/block/blk-integrity.c @@ -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; -- cgit v1.2.3