From 3921ae0850a31f06791e3c5d8f628864b5ae088a Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 5 Jul 2024 18:51:41 +0200 Subject: [PATCH] nfs/blocklayout: add support for NVMe 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 Reviewed-by: Sagi Grimberg Reviewed-by: Benjamin Coddington Signed-off-by: Anna Schumaker --- fs/nfs/blocklayout/dev.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/nfs/blocklayout/dev.c b/fs/nfs/blocklayout/dev.c index 221781fb9cf1..6252f4447945 100644 --- a/fs/nfs/blocklayout/dev.c +++ b/fs/nfs/blocklayout/dev.c @@ -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);