kernel/linux.git/include/uapi/linux/nfsd_netlink.h, branch v7.2-rc1

NFSD: Add NFSD_CMD_UNLOCK_EXPORT netlink command

2026-06-09T20:32:59+00:00

When a filesystem is exported to NFS clients, NFSv4 state (opens, locks, delegations, layouts) holds references that prevent the underlying filesystem from being unmounted. NFSD_CMD_UNLOCK_FILESYSTEM addresses this at superblock granularity, but administrators unexporting a single path on a shared filesystem (e.g., one of several exports on the same device) need finer control. Add NFSD_CMD_UNLOCK_EXPORT, which revokes NFSv4 state acquired through exports of a specific path. Matching is by path identity (dentry + vfsmount) via the sc_export field on each nfs4_stid, so multiple svc_export objects for the same path -- one per auth_domain -- are handled correctly without requiring the caller to name a specific client. The command takes a single "path" attribute. Userspace (exportfs -u) sends this after removing the last client for a given path, enabling the underlying filesystem to be unmounted. When multiple clients share an export path, individual unexports do not trigger state revocation; only the final one does. Reviewed-by: Jeff Layton Tested-by: Dai Ngo Signed-off-by: Chuck Lever

NFSD: Add NFSD_CMD_UNLOCK_FILESYSTEM netlink command

2026-06-09T20:32:59+00:00

Add NFSD_CMD_UNLOCK_FILESYSTEM as a dedicated netlink command for revoking NFS state under a filesystem path, providing a netlink equivalent of /proc/fs/nfsd/unlock_fs. The command requires a "path" string attribute containing the filesystem path whose state should be released. The handler resolves the path to its superblock, then cancels async copies, releases NLM locks, and revokes NFSv4 state on that superblock. Reviewed-by: Jeff Layton Tested-by: Dai Ngo Signed-off-by: Chuck Lever

NFSD: Add NFSD_CMD_UNLOCK_IP netlink command

2026-06-09T20:32:59+00:00

The existing write_unlock_ip procfs interface releases NLM file locks held by a specific client IP address, but procfs provides no structured way to extend that operation to other scopes such as revoking NFSv4 state. Add NFSD_CMD_UNLOCK_IP as a dedicated netlink command for releasing NLM locks by client address. The command accepts a binary sockaddr_in or sockaddr_in6 in its address attribute. The handler validates the address family and length, then calls nlmsvc_unlock_all_by_ip() to release matching NLM locks. Because lockd is a single global instance, that call operates across all network namespaces regardless of which namespace the caller inhabits. A separate netlink command for filesystem-scoped unlock is added in a subsequent commit. The nfsd_ctl_unlock_ip tracepoint is updated from string-based address logging to __sockaddr, which stores the binary sockaddr and formats it with %pISpc. This affects both the new netlink path and the existing procfs write_unlock_ip path, giving consistent structured output in both cases. Reviewed-by: Jeff Layton Tested-by: Dai Ngo Signed-off-by: Chuck Lever

nfsd: add NFSD_CMD_CACHE_FLUSH netlink command

2026-06-01T15:08:18+00:00

Add a new NFSD_CMD_CACHE_FLUSH generic netlink command that allows userspace to flush the nfsd export caches (svc_export and expkey) without writing to /proc/net/rpc/*/flush. An optional NFSD_A_CACHE_FLUSH_MASK u32 attribute selects which caches to flush (bit 1 = svc_export, bit 2 = expkey). If the attribute is omitted, all nfsd caches are flushed. This is used by exportfs to replace its /proc-based cache_flush() with a netlink equivalent, with /proc fallback for older kernels. Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever

nfsd: add netlink upcall for the nfsd.fh cache

2026-06-01T15:08:18+00:00

Add netlink-based cache upcall support for the expkey (nfsd.fh) cache, following the same pattern as the existing svc_export netlink support. Add expkey to the cache-type enum, a new expkey attribute-set with client, fsidtype, fsid, negative, expiry, and path fields, and the expkey-get-reqs / expkey-set-reqs operations to the nfsd YAML spec and generated headers. Implement nfsd_nl_expkey_get_reqs_dumpit() which snapshots pending expkey cache requests and sends each entry's seqno, client name, fsidtype, and fsid over netlink. Implement nfsd_nl_expkey_set_reqs_doit() which parses expkey cache responses from userspace (client, fsidtype, fsid, expiry, and path or negative flag) and updates the cache via svc_expkey_lookup() / svc_expkey_update(). Wire up the expkey_notify() callback in svc_expkey_cache_template so cache misses trigger NFSD_CMD_CACHE_NOTIFY multicast events with NFSD_CACHE_TYPE_EXPKEY. Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever

nfsd: add netlink upcall for the svc_export cache

2026-06-01T15:08:18+00:00

Add netlink-based cache upcall support for the svc_export (nfsd.export) cache to Documentation/netlink/specs/nfsd.yaml and regenerate the resulting files. Implement nfsd_cache_notify() which sends a NFSD_CMD_CACHE_NOTIFY multicast event to the "exportd" group, carrying the cache type so userspace knows which cache has pending requests. Implement nfsd_nl_svc_export_get_reqs_dumpit() which snapshots pending svc_export cache requests and sends each entry's seqno, client name, and path over netlink. Implement nfsd_nl_svc_export_set_reqs_doit() which parses svc_export cache responses from userspace (client, path, expiry, flags, anon uid/gid, fslocations, uuid, secinfo, xprtsec, fsid, or negative flag) and updates the cache via svc_export_lookup() / svc_export_update(). Wire up the svc_export_notify() callback in svc_export_cache_template so cache misses trigger NFSD_CMD_CACHE_NOTIFY multicast events with NFSD_CACHE_TYPE_SVC_EXPORT. Note that the export-flags and xprtsec-mode enums are organized to match their counterparts in include/uapi/linux/nfsd/export.h. The intent is that future export options will only be added to the netlink headers, which should eliminate the need to keep so much in sync. Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever

NFSD: Add a key for signing filehandles

2026-03-30T01:25:09+00:00

A future patch will enable NFSD to sign filehandles by appending a Message Authentication Code(MAC). To do this, NFSD requires a secret 128-bit key that can persist across reboots. A persisted key allows the server to accept filehandles after a restart. Enable NFSD to be configured with this key via the netlink interface. Link: https://lore.kernel.org/linux-nfs/cover.1772022373.git.bcodding@hammerspace.com Signed-off-by: Benjamin Coddington Reviewed-by: Jeff Layton Signed-off-by: Chuck Lever

nfsd: add controls to set the minimum number of threads per pool

2026-01-28T15:15:42+00:00

Add a new "min_threads" variable to the nfsd_net, along with the corresponding netlink interface, to set that value from userland. Pass that value to svc_set_pool_threads() and svc_set_num_threads(). Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever

tools: ynl-gen: add regeneration comment

2025-11-26T03:20:42+00:00

Add a comment on regeneration to the generated files. The comment is placed after the YNL-GEN line[1], as to not interfere with ynl-regen.sh's detection logic. [1] and after the optional YNL-ARG line. Link: https://lore.kernel.org/r/aR5m174O7pklKrMR@zx2c4.com/ Suggested-by: Jason A. Donenfeld Signed-off-by: Asbjørn Sloth Tønnesen Acked-by: Matthieu Baerts (NGI0) Link: https://patch.msgid.link/20251120174429.390574-3-ast@fiberby.net Signed-off-by: Jakub Kicinski

nfsd: new netlink ops to get/set server pool_mode

2024-07-08T18:10:05+00:00

Signed-off-by: Jeff Layton Signed-off-by: Chuck Lever