Commit d2d1c454 authored by Israel Rukshin's avatar Israel Rukshin Committed by Christoph Hellwig
Browse files

nvmet: add metadata characteristics for a namespace 



Fill those namespace fields from the block device format for adding
metadata (T10-PI) over fabric support with block devices.

Signed-off-by: default avatarIsrael Rukshin <israelr@mellanox.com>
Signed-off-by: default avatarMax Gurtovoy <maxg@mellanox.com>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
parent 5ec5d3bd

drivers/nvme/target/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ config NVME_TARGET 
	tristate "NVMe Target support"

	depends on BLOCK

	depends on CONFIGFS_FS

	select BLK_DEV_INTEGRITY_T10 if BLK_DEV_INTEGRITY

	select SGL_ALLOC

	help

	  This enabled target side support for the NVMe protocol, that is

drivers/nvme/target/io-cmd-bdev.c

+22 −0
Original line number Diff line number Diff line
@@ -47,6 +47,22 @@ void nvmet_bdev_set_limits(struct block_device *bdev, struct nvme_id_ns *id) 
	id->nows = to0based(ql->io_opt / ql->logical_block_size);

}



static void nvmet_bdev_ns_enable_integrity(struct nvmet_ns *ns)

{

	struct blk_integrity *bi = bdev_get_integrity(ns->bdev);



	if (bi) {

		ns->metadata_size = bi->tuple_size;

		if (bi->profile == &t10_pi_type1_crc)

			ns->pi_type = NVME_NS_DPS_PI_TYPE1;

		else if (bi->profile == &t10_pi_type3_crc)

			ns->pi_type = NVME_NS_DPS_PI_TYPE3;

		else

			/* Unsupported metadata type */

			ns->metadata_size = 0;

	}

}



int nvmet_bdev_ns_enable(struct nvmet_ns *ns)

{

	int ret;
@@ -64,6 +80,12 @@ int nvmet_bdev_ns_enable(struct nvmet_ns *ns) 
	}

	ns->size = i_size_read(ns->bdev->bd_inode);

	ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));



	ns->pi_type = 0;

	ns->metadata_size = 0;

	if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY_T10))

		nvmet_bdev_ns_enable_integrity(ns);



	return 0;

}

drivers/nvme/target/nvmet.h

+3 −0
Original line number Diff line number Diff line
@@ -19,6 +19,7 @@ 
#include <linux/rcupdate.h>

#include <linux/blkdev.h>

#include <linux/radix-tree.h>

#include <linux/t10-pi.h>



#define NVMET_ASYNC_EVENTS		4

#define NVMET_ERROR_LOG_SLOTS		128
@@ -77,6 +78,8 @@ struct nvmet_ns { 


	int			use_p2pmem;

	struct pci_dev		*p2p_dev;

	int			pi_type;

	int			metadata_size;

};



static inline struct nvmet_ns *to_nvmet_ns(struct config_item *item)

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