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nfs/blocklayout: add support for NVMe

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Look for the udev generated persistent device name for NVMe devices
in addition to the SCSI ones and the Redhat-specific device mapper
name.

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

Note that the udev rules for nvme are a bit of a mess and udev will only
create a link for the uuid if the NVMe namespace has one, and not the
NGUID.  As the current RFCs don't support UUID based identifications this
means the layout can't be used on such namespaces out of the box.  A
small tweak to the udev rules can work around it, and as the real fix I
will submit a draft to the IETF NFSv4 working group to support UUID-based
identifiers for SCSI and NVMe.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Christoph Hellwig 2024-07-05 18:51:41 +02:00 committed by Anna Schumaker
parent 7f296b25f2
commit 3921ae0850
1 changed files with 2 additions and 0 deletions
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fs/nfs/blocklayout/dev.c
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@ -404,6 +404,8 @@ bl_parse_scsi(struct nfs_server *server, struct pnfs_block_dev *d,
bdev_file = bl_open_path(v, "dm-uuid-mpath-0x");
if (IS_ERR(bdev_file))
bdev_file = bl_open_path(v, "wwn-0x");
if (IS_ERR(bdev_file))
bdev_file = bl_open_path(v, "nvme-eui.");
if (IS_ERR(bdev_file)) {
pr_warn("pNFS: no device found for volume %*phN\n",
v->scsi.designator_len, v->scsi.designator);