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: Israel Rukshin <israelr@mellanox.com>
Signed-off-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Israel Rukshin 2020-05-19 17:05:57 +03:00 committed by Christoph Hellwig
parent 5ec5d3bddc
commit d2d1c454a4
3 changed files with 26 additions and 0 deletions

View File

@ -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

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@ -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;
}

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@ -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)