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nvme: implement ->get_unique_id

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Implement the get_unique_id method to allow pNFS SCSI layout access to
NVMe namespaces.

This is the server side implementation of RFC 9561 "Using the Parallel
NFS (pNFS) SCSI Layout to Access Non-Volatile Memory Express (NVMe)
Storage Devices".

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Christoph Hellwig
2024-07-05 18:46:26 +02:00
committed by Keith Busch
parent f227345f0a
commit 18f03a063d
3 changed files with 46 additions and 0 deletions
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16
drivers/nvme/host/multipath.c
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@@ -488,6 +488,21 @@ static void nvme_ns_head_release(struct gendisk *disk)
nvme_put_ns_head(disk->private_data);
}
static int nvme_ns_head_get_unique_id(struct gendisk *disk, u8 id[16],
enum blk_unique_id type)
{
struct nvme_ns_head *head = disk->private_data;
struct nvme_ns *ns;
int srcu_idx, ret = -EWOULDBLOCK;
srcu_idx = srcu_read_lock(&head->srcu);
ns = nvme_find_path(head);
if (ns)
ret = nvme_ns_get_unique_id(ns, id, type);
srcu_read_unlock(&head->srcu, srcu_idx);
return ret;
}
#ifdef CONFIG_BLK_DEV_ZONED
static int nvme_ns_head_report_zones(struct gendisk *disk, sector_t sector,
unsigned int nr_zones, report_zones_cb cb, void *data)
@@ -515,6 +530,7 @@ const struct block_device_operations nvme_ns_head_ops = {
.ioctl = nvme_ns_head_ioctl,
.compat_ioctl = blkdev_compat_ptr_ioctl,
.getgeo = nvme_getgeo,
.get_unique_id = nvme_ns_head_get_unique_id,
.report_zones = nvme_ns_head_report_zones,
.pr_ops = &nvme_pr_ops,
};