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 <jlayton@kernel.org>
---
 Documentation/netlink/specs/nfsd.yaml | 174 +++++++++++++
 fs/nfsd/export.c                      | 443 +++++++++++++++++++++++++++++++++-
 fs/nfsd/netlink.c                     |  61 +++++
 fs/nfsd/netlink.h                     |  13 +
 fs/nfsd/nfsctl.c                      |  28 +++
 fs/nfsd/nfsd.h                        |   2 +-
 include/uapi/linux/nfsd_netlink.h     | 110 +++++++++
 net/sunrpc/netlink.c                  |  17 +-
 net/sunrpc/netlink.h                  |   3 +-
 9 files changed, 835 insertions(+), 16 deletions(-)

diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlink/specs/nfsd.yaml
index 8ab43c8253b2e83bcc178c3f4fe8c41c2997d153..709751502f8b56bd4b68462fa15337df5e3e035e 100644
--- a/Documentation/netlink/specs/nfsd.yaml
+++ b/Documentation/netlink/specs/nfsd.yaml
@@ -6,7 +6,51 @@ uapi-header: linux/nfsd_netlink.h
 
 doc: NFSD configuration over generic netlink.
 
+definitions:
+  -
+    type: flags
+    name: cache-type
+    entries: [svc_export]
+  -
+    type: flags
+    name: export-flags
+    doc: These flags are ordered to match the NFSEXP_* flags in include/linux/nfsd/export.h
+    entries:
+      - readonly
+      - insecure-port
+      - rootsquash
+      - allsquash
+      - async
+      - gathered-writes
+      - noreaddirplus
+      - security-label
+      - sign-fh
+      - nohide
+      - nosubtreecheck
+      - noauthnlm
+      - msnfs
+      - fsid
+      - crossmount
+      - noacl
+      - v4root
+      - pnfs
+  -
+    type: flags
+    name: xprtsec-mode
+    doc: These flags are ordered to match the NFSEXP_XPRTSEC_* flags in include/linux/nfsd/export.h
+    entries:
+      - none
+      - tls
+      - mtls
+
 attribute-sets:
+  -
+    name: cache-notify
+    attributes:
+      -
+        name: cache-type
+        type: u32
+        enum: cache-type
   -
     name: rpc-status
     attributes:
@@ -132,6 +176,103 @@ attribute-sets:
       -
         name: npools
         type: u32
+  -
+    name: fslocation
+    attributes:
+      -
+        name: host
+        type: string
+      -
+        name: path
+        type: string
+  -
+    name: fslocations
+    attributes:
+      -
+        name: location
+        type: nest
+        nested-attributes: fslocation
+        multi-attr: true
+  -
+    name: auth-flavor
+    attributes:
+      -
+        name: pseudoflavor
+        type: u32
+      -
+        name: flags
+        type: u32
+        enum: export-flags
+        enum-as-flags: true
+  -
+    name: svc-export-req
+    attributes:
+      -
+        name: seqno
+        type: u64
+      -
+        name: client
+        type: string
+      -
+        name: path
+        type: string
+  -
+    name: svc-export
+    attributes:
+      -
+        name: seqno
+        type: u64
+      -
+        name: client
+        type: string
+      -
+        name: path
+        type: string
+      -
+        name: negative
+        type: flag
+      -
+        name: expiry
+        type: u64
+      -
+        name: anon-uid
+        type: u32
+      -
+        name: anon-gid
+        type: u32
+      -
+        name: fslocations
+        type: nest
+        nested-attributes: fslocations
+      -
+        name: uuid
+        type: binary
+      -
+        name: secinfo
+        type: nest
+        nested-attributes: auth-flavor
+        multi-attr: true
+      -
+        name: xprtsec
+        type: u32
+        enum: xprtsec-mode
+        multi-attr: true
+      -
+        name: flags
+        type: u32
+        enum: export-flags
+        enum-as-flags: true
+      -
+        name: fsid
+        type: s32
+  -
+    name: svc-export-reqs
+    attributes:
+      -
+        name: requests
+        type: nest
+        nested-attributes: svc-export
+        multi-attr: true
 
 operations:
   list:
@@ -233,3 +374,36 @@ operations:
           attributes:
             - mode
             - npools
+    -
+      name: cache-notify
+      doc: Notification that there are cache requests that need servicing
+      attribute-set: cache-notify
+      mcgrp: exportd
+      event:
+        attributes:
+          - cache-type
+    -
+      name: svc-export-get-reqs
+      doc: Dump all pending svc_export requests
+      attribute-set: svc-export-reqs
+      flags: [admin-perm]
+      dump:
+          request:
+            attributes:
+              - requests
+    -
+      name: svc-export-set-reqs
+      doc: Respond to one or more svc_export requests
+      attribute-set: svc-export-reqs
+      flags: [admin-perm]
+      do:
+          request:
+            attributes:
+              - requests
+
+mcast-groups:
+  list:
+    -
+      name: none
+    -
+      name: exportd
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index e83e88e69d90ab48c7aff58ac2b36cd1a6e1bb71..cfe542fd7b22e27a7971a1f792061767068ac439 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -17,6 +17,8 @@
 #include <linux/module.h>
 #include <linux/exportfs.h>
 #include <linux/sunrpc/svc_xprt.h>
+#include <net/genetlink.h>
+#include <uapi/linux/nfsd_netlink.h>
 
 #include "nfsd.h"
 #include "nfsfh.h"
@@ -24,6 +26,7 @@
 #include "pnfs.h"
 #include "filecache.h"
 #include "trace.h"
+#include "netlink.h"
 
 #define NFSDDBG_FACILITY	NFSDDBG_EXPORT
 
@@ -386,11 +389,446 @@ static void svc_export_put(struct kref *ref)
 	queue_rcu_work(nfsd_export_wq, &exp->ex_rwork);
 }
 
+/**
+ * nfsd_nl_svc_export_get_reqs_dumpit - dump pending svc_export requests
+ * @skb: reply buffer
+ * @cb: netlink metadata and command arguments
+ *
+ * Walk the svc_export cache's pending request list and create a netlink
+ * message with a nested entry for each cache_request, containing the
+ * seqno, client string, and path.
+ *
+ * Uses cb->args[0] as a seqno cursor for dump continuation across
+ * multiple netlink messages.
+ *
+ * Returns the size of the reply or a negative errno.
+ */
+int nfsd_nl_svc_export_get_reqs_dumpit(struct sk_buff *skb,
+				       struct netlink_callback *cb)
+{
+	struct nfsd_net *nn;
+	struct cache_detail *cd;
+	struct cache_head **items;
+	u64 *seqnos;
+	int cnt, i, emitted;
+	char *pathbuf;
+	void *hdr;
+	int ret;
+
+	nn = net_generic(sock_net(skb->sk), nfsd_net_id);
+
+	mutex_lock(&nfsd_mutex);
+
+	cd = nn->svc_export_cache;
+	if (!cd) {
+		ret = -ENODEV;
+		goto out_unlock;
+	}
+
+	cnt = sunrpc_cache_requests_count(cd);
+	if (!cnt) {
+		ret = 0;
+		goto out_unlock;
+	}
+
+	items = kcalloc(cnt, sizeof(*items), GFP_KERNEL);
+	seqnos = kcalloc(cnt, sizeof(*seqnos), GFP_KERNEL);
+	pathbuf = kmalloc(PATH_MAX, GFP_KERNEL);
+	if (!items || !seqnos || !pathbuf) {
+		ret = -ENOMEM;
+		goto out_alloc;
+	}
+
+	cnt = sunrpc_cache_requests_snapshot(cd, items, seqnos, cnt,
+					     cb->args[0]);
+	if (!cnt) {
+		ret = 0;
+		goto out_alloc;
+	}
+
+	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid,
+			  cb->nlh->nlmsg_seq, &nfsd_nl_family,
+			  NLM_F_MULTI, NFSD_CMD_SVC_EXPORT_GET_REQS);
+	if (!hdr) {
+		ret = -ENOBUFS;
+		goto out_put;
+	}
+
+	emitted = 0;
+	for (i = 0; i < cnt; i++) {
+		struct svc_export *exp;
+		struct nlattr *nest;
+		char *pth;
+
+		exp = container_of(items[i], struct svc_export, h);
+
+		pth = d_path(&exp->ex_path, pathbuf, PATH_MAX);
+		if (IS_ERR(pth))
+			continue;
+
+		nest = nla_nest_start(skb,
+				      NFSD_A_SVC_EXPORT_REQS_REQUESTS);
+		if (!nest)
+			break;
+
+		if (nla_put_u64_64bit(skb, NFSD_A_SVC_EXPORT_SEQNO,
+				      seqnos[i], 0) ||
+		    nla_put_string(skb, NFSD_A_SVC_EXPORT_CLIENT,
+				   exp->ex_client->name) ||
+		    nla_put_string(skb, NFSD_A_SVC_EXPORT_PATH, pth)) {
+			nla_nest_cancel(skb, nest);
+			break;
+		}
+
+		nla_nest_end(skb, nest);
+		cb->args[0] = seqnos[i];
+		emitted++;
+	}
+
+	if (!emitted) {
+		genlmsg_cancel(skb, hdr);
+		ret = -EMSGSIZE;
+		goto out_put;
+	}
+
+	genlmsg_end(skb, hdr);
+	ret = skb->len;
+out_put:
+	for (i = 0; i < cnt; i++)
+		cache_put(items[i], cd);
+out_alloc:
+	kfree(pathbuf);
+	kfree(seqnos);
+	kfree(items);
+out_unlock:
+	mutex_unlock(&nfsd_mutex);
+	return ret;
+}
+
+/**
+ * nfsd_nl_parse_fslocations - parse fslocations from netlink
+ * @attr: NFSD_A_SVC_EXPORT_FSLOCATIONS nested attribute
+ * @fsloc: fslocations struct to fill in
+ *
+ * Returns 0 on success or a negative errno.
+ */
+static int nfsd_nl_parse_fslocations(struct nlattr *attr,
+				     struct nfsd4_fs_locations *fsloc)
+{
+	struct nlattr *loc_attr;
+	int rem, count = 0;
+	int err;
+
+	if (fsloc->locations)
+		return -EINVAL;
+
+	/* Count locations first */
+	nla_for_each_nested_type(loc_attr, NFSD_A_FSLOCATIONS_LOCATION,
+				 attr, rem)
+		count++;
+
+	if (count > MAX_FS_LOCATIONS)
+		return -EINVAL;
+	if (!count)
+		return 0;
+
+	fsloc->locations = kcalloc(count, sizeof(struct nfsd4_fs_location),
+				   GFP_KERNEL);
+	if (!fsloc->locations)
+		return -ENOMEM;
+
+	nla_for_each_nested_type(loc_attr, NFSD_A_FSLOCATIONS_LOCATION,
+				 attr, rem) {
+		struct nlattr *tb[NFSD_A_FSLOCATION_PATH + 1];
+		struct nfsd4_fs_location *loc;
+
+		err = nla_parse_nested(tb, NFSD_A_FSLOCATION_PATH, loc_attr,
+				       nfsd_fslocation_nl_policy, NULL);
+		if (err)
+			goto out_free;
+
+		if (!tb[NFSD_A_FSLOCATION_HOST] ||
+		    !tb[NFSD_A_FSLOCATION_PATH]) {
+			err = -EINVAL;
+			goto out_free;
+		}
+
+		loc = &fsloc->locations[fsloc->locations_count++];
+		loc->hosts = kstrdup(nla_data(tb[NFSD_A_FSLOCATION_HOST]),
+				     GFP_KERNEL);
+		loc->path = kstrdup(nla_data(tb[NFSD_A_FSLOCATION_PATH]),
+				    GFP_KERNEL);
+		if (!loc->hosts || !loc->path) {
+			err = -ENOMEM;
+			goto out_free;
+		}
+	}
+
+	return 0;
+out_free:
+	nfsd4_fslocs_free(fsloc);
+	return err;
+}
+
+static struct svc_export *svc_export_update(struct svc_export *new,
+					    struct svc_export *old);
+static struct svc_export *svc_export_lookup(struct svc_export *);
+static int check_export(const struct path *path, int *flags,
+			unsigned char *uuid);
+
+/**
+ * @cd: cache_detail for the svc_export cache
+ * @attr: nested attribute containing svc-export fields
+ *
+ * Parses one svc-export entry from a netlink message and updates the
+ * cache. Mirrors the logic in svc_export_parse().
+ *
+ * Returns 0 on success or a negative errno.
+ */
+static int nfsd_nl_parse_one_export(struct cache_detail *cd,
+				    struct nlattr *attr)
+{
+	struct nlattr *tb[NFSD_A_SVC_EXPORT_FSID + 1];
+	struct auth_domain *dom = NULL;
+	struct svc_export exp = {}, *expp;
+	struct nlattr *secinfo_attr;
+	struct timespec64 boot;
+	int err, rem;
+
+	err = nla_parse_nested(tb, NFSD_A_SVC_EXPORT_FSID, attr,
+			       nfsd_svc_export_nl_policy, NULL);
+	if (err)
+		return err;
+
+	/* client (required) */
+	if (!tb[NFSD_A_SVC_EXPORT_CLIENT])
+		return -EINVAL;
+
+	dom = auth_domain_find(nla_data(tb[NFSD_A_SVC_EXPORT_CLIENT]));
+	if (!dom)
+		return -ENOENT;
+
+	/* path (required) */
+	if (!tb[NFSD_A_SVC_EXPORT_PATH]) {
+		err = -EINVAL;
+		goto out_dom;
+	}
+
+	err = kern_path(nla_data(tb[NFSD_A_SVC_EXPORT_PATH]), 0,
+			&exp.ex_path);
+	if (err)
+		goto out_dom;
+
+	exp.ex_client = dom;
+	exp.cd = cd;
+	exp.ex_devid_map = NULL;
+	exp.ex_xprtsec_modes = NFSEXP_XPRTSEC_ALL;
+
+	/* expiry (required, wallclock seconds) */
+	if (!tb[NFSD_A_SVC_EXPORT_EXPIRY]) {
+		err = -EINVAL;
+		goto out_path;
+	}
+	getboottime64(&boot);
+	exp.h.expiry_time = nla_get_u64(tb[NFSD_A_SVC_EXPORT_EXPIRY]) -
+			    boot.tv_sec;
+
+	if (tb[NFSD_A_SVC_EXPORT_NEGATIVE]) {
+		set_bit(CACHE_NEGATIVE, &exp.h.flags);
+	} else {
+		/* flags */
+		if (tb[NFSD_A_SVC_EXPORT_FLAGS])
+			exp.ex_flags = nla_get_u32(tb[NFSD_A_SVC_EXPORT_FLAGS]);
+
+		/* anon uid */
+		if (tb[NFSD_A_SVC_EXPORT_ANON_UID]) {
+			u32 uid = nla_get_u32(tb[NFSD_A_SVC_EXPORT_ANON_UID]);
+
+			exp.ex_anon_uid = make_kuid(current_user_ns(), uid);
+		}
+
+		/* anon gid */
+		if (tb[NFSD_A_SVC_EXPORT_ANON_GID]) {
+			u32 gid = nla_get_u32(tb[NFSD_A_SVC_EXPORT_ANON_GID]);
+
+			exp.ex_anon_gid = make_kgid(current_user_ns(), gid);
+		}
+
+		/* fsid */
+		if (tb[NFSD_A_SVC_EXPORT_FSID])
+			exp.ex_fsid = nla_get_s32(tb[NFSD_A_SVC_EXPORT_FSID]);
+
+		/* fslocations */
+		if (tb[NFSD_A_SVC_EXPORT_FSLOCATIONS]) {
+			struct nlattr *fsl = tb[NFSD_A_SVC_EXPORT_FSLOCATIONS];
+
+			err = nfsd_nl_parse_fslocations(fsl,
+							&exp.ex_fslocs);
+			if (err)
+				goto out_path;
+		}
+
+		/* uuid */
+		if (tb[NFSD_A_SVC_EXPORT_UUID]) {
+			if (nla_len(tb[NFSD_A_SVC_EXPORT_UUID]) !=
+			    EX_UUID_LEN) {
+				err = -EINVAL;
+				goto out_fslocs;
+			}
+			exp.ex_uuid = kmemdup(nla_data(tb[NFSD_A_SVC_EXPORT_UUID]),
+					      EX_UUID_LEN, GFP_KERNEL);
+			if (!exp.ex_uuid) {
+				err = -ENOMEM;
+				goto out_fslocs;
+			}
+		}
+
+		/* secinfo (multi-attr) */
+		nla_for_each_nested_type(secinfo_attr,
+					 NFSD_A_SVC_EXPORT_SECINFO,
+					 attr, rem) {
+			struct nlattr *ftb[NFSD_A_AUTH_FLAVOR_FLAGS + 1];
+			struct exp_flavor_info *f;
+
+			if (exp.ex_nflavors >= MAX_SECINFO_LIST) {
+				err = -EINVAL;
+				goto out_uuid;
+			}
+
+			err = nla_parse_nested(ftb,
+					       NFSD_A_AUTH_FLAVOR_FLAGS,
+					       secinfo_attr,
+					       nfsd_auth_flavor_nl_policy,
+					       NULL);
+			if (err)
+				goto out_uuid;
+
+			f = &exp.ex_flavors[exp.ex_nflavors++];
+
+			if (ftb[NFSD_A_AUTH_FLAVOR_PSEUDOFLAVOR])
+				f->pseudoflavor = nla_get_u32(ftb[NFSD_A_AUTH_FLAVOR_PSEUDOFLAVOR]);
+
+			if (ftb[NFSD_A_AUTH_FLAVOR_FLAGS])
+				f->flags = nla_get_u32(ftb[NFSD_A_AUTH_FLAVOR_FLAGS]);
+
+			/* Only some flags are allowed to differ between flavors: */
+			if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp.ex_flags)) {
+				err = -EINVAL;
+				goto out_uuid;
+			}
+		}
+
+		/* xprtsec (multi-attr u32) */
+		if (tb[NFSD_A_SVC_EXPORT_XPRTSEC]) {
+			struct nlattr *xp_attr;
+
+			exp.ex_xprtsec_modes = 0;
+			nla_for_each_nested_type(xp_attr,
+						 NFSD_A_SVC_EXPORT_XPRTSEC,
+						 attr, rem) {
+				u32 mode = nla_get_u32(xp_attr);
+
+				if (mode > NFSEXP_XPRTSEC_MTLS) {
+					err = -EINVAL;
+					goto out_uuid;
+				}
+				exp.ex_xprtsec_modes |= mode;
+			}
+		}
+
+		err = check_export(&exp.ex_path, &exp.ex_flags,
+				   exp.ex_uuid);
+		if (err)
+			goto out_uuid;
+
+		if (exp.h.expiry_time < seconds_since_boot())
+			goto out_uuid;
+
+		err = -EINVAL;
+		if (!uid_valid(exp.ex_anon_uid))
+			goto out_uuid;
+		if (!gid_valid(exp.ex_anon_gid))
+			goto out_uuid;
+		err = 0;
+
+		nfsd4_setup_layout_type(&exp);
+	}
+
+	expp = svc_export_lookup(&exp);
+	if (!expp) {
+		err = -ENOMEM;
+		goto out_uuid;
+	}
+	expp = svc_export_update(&exp, expp);
+	if (expp) {
+		trace_nfsd_export_update(expp);
+		cache_flush();
+		exp_put(expp);
+	} else {
+		err = -ENOMEM;
+	}
+
+out_uuid:
+	kfree(exp.ex_uuid);
+out_fslocs:
+	nfsd4_fslocs_free(&exp.ex_fslocs);
+out_path:
+	path_put(&exp.ex_path);
+out_dom:
+	auth_domain_put(dom);
+	return err;
+}
+
+/**
+ * nfsd_nl_svc_export_set_reqs_doit - respond to svc_export requests
+ * @skb: reply buffer
+ * @info: netlink metadata and command arguments
+ *
+ * Parse one or more svc_export cache responses from userspace and
+ * update the export cache accordingly.
+ *
+ * Returns 0 on success or a negative errno.
+ */
+int nfsd_nl_svc_export_set_reqs_doit(struct sk_buff *skb,
+				     struct genl_info *info)
+{
+	struct nfsd_net *nn;
+	struct cache_detail *cd;
+	const struct nlattr *attr;
+	int rem, ret = 0;
+
+	nn = net_generic(genl_info_net(info), nfsd_net_id);
+
+	mutex_lock(&nfsd_mutex);
+
+	cd = nn->svc_export_cache;
+	if (!cd) {
+		ret = -ENODEV;
+		goto out_unlock;
+	}
+
+	nlmsg_for_each_attr_type(attr, NFSD_A_SVC_EXPORT_REQS_REQUESTS,
+				 info->nlhdr, GENL_HDRLEN, rem) {
+		ret = nfsd_nl_parse_one_export(cd, (struct nlattr *)attr);
+		if (ret)
+			break;
+	}
+
+out_unlock:
+	mutex_unlock(&nfsd_mutex);
+	return ret;
+}
+
 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
 {
 	return sunrpc_cache_upcall(cd, h);
 }
 
+static int svc_export_notify(struct cache_detail *cd, struct cache_head *h)
+{
+	return nfsd_cache_notify(cd, h, NFSD_CACHE_TYPE_SVC_EXPORT);
+}
+
 static void svc_export_request(struct cache_detail *cd,
 			       struct cache_head *h,
 			       char **bpp, int *blen)
@@ -410,10 +848,6 @@ static void svc_export_request(struct cache_detail *cd,
 	(*bpp)[-1] = '\n';
 }
 
-static struct svc_export *svc_export_update(struct svc_export *new,
-					    struct svc_export *old);
-static struct svc_export *svc_export_lookup(struct svc_export *);
-
 static int check_export(const struct path *path, int *flags, unsigned char *uuid)
 {
 	struct inode *inode = d_inode(path->dentry);
@@ -907,6 +1341,7 @@ static const struct cache_detail svc_export_cache_template = {
 	.name		= "nfsd.export",
 	.cache_put	= svc_export_put,
 	.cache_upcall	= svc_export_upcall,
+	.cache_notify	= svc_export_notify,
 	.cache_request	= svc_export_request,
 	.cache_parse	= svc_export_parse,
 	.cache_show	= svc_export_show,
diff --git a/fs/nfsd/netlink.c b/fs/nfsd/netlink.c
index 81c943345d13db849483bf0d6773458115ff0134..fb401d7302afb9e41cb074581f7b94e8ece6cf0c 100644
--- a/fs/nfsd/netlink.c
+++ b/fs/nfsd/netlink.c
@@ -12,11 +12,41 @@
 #include <uapi/linux/nfsd_netlink.h>
 
 /* Common nested types */
+const struct nla_policy nfsd_auth_flavor_nl_policy[NFSD_A_AUTH_FLAVOR_FLAGS + 1] = {
+	[NFSD_A_AUTH_FLAVOR_PSEUDOFLAVOR] = { .type = NLA_U32, },
+	[NFSD_A_AUTH_FLAVOR_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x3ffff),
+};
+
+const struct nla_policy nfsd_fslocation_nl_policy[NFSD_A_FSLOCATION_PATH + 1] = {
+	[NFSD_A_FSLOCATION_HOST] = { .type = NLA_NUL_STRING, },
+	[NFSD_A_FSLOCATION_PATH] = { .type = NLA_NUL_STRING, },
+};
+
+const struct nla_policy nfsd_fslocations_nl_policy[NFSD_A_FSLOCATIONS_LOCATION + 1] = {
+	[NFSD_A_FSLOCATIONS_LOCATION] = NLA_POLICY_NESTED(nfsd_fslocation_nl_policy),
+};
+
 const struct nla_policy nfsd_sock_nl_policy[NFSD_A_SOCK_TRANSPORT_NAME + 1] = {
 	[NFSD_A_SOCK_ADDR] = { .type = NLA_BINARY, },
 	[NFSD_A_SOCK_TRANSPORT_NAME] = { .type = NLA_NUL_STRING, },
 };
 
+const struct nla_policy nfsd_svc_export_nl_policy[NFSD_A_SVC_EXPORT_FSID + 1] = {
+	[NFSD_A_SVC_EXPORT_SEQNO] = { .type = NLA_U64, },
+	[NFSD_A_SVC_EXPORT_CLIENT] = { .type = NLA_NUL_STRING, },
+	[NFSD_A_SVC_EXPORT_PATH] = { .type = NLA_NUL_STRING, },
+	[NFSD_A_SVC_EXPORT_NEGATIVE] = { .type = NLA_FLAG, },
+	[NFSD_A_SVC_EXPORT_EXPIRY] = { .type = NLA_U64, },
+	[NFSD_A_SVC_EXPORT_ANON_UID] = { .type = NLA_U32, },
+	[NFSD_A_SVC_EXPORT_ANON_GID] = { .type = NLA_U32, },
+	[NFSD_A_SVC_EXPORT_FSLOCATIONS] = NLA_POLICY_NESTED(nfsd_fslocations_nl_policy),
+	[NFSD_A_SVC_EXPORT_UUID] = { .type = NLA_BINARY, },
+	[NFSD_A_SVC_EXPORT_SECINFO] = NLA_POLICY_NESTED(nfsd_auth_flavor_nl_policy),
+	[NFSD_A_SVC_EXPORT_XPRTSEC] = NLA_POLICY_MASK(NLA_U32, 0x7),
+	[NFSD_A_SVC_EXPORT_FLAGS] = NLA_POLICY_MASK(NLA_U32, 0x3ffff),
+	[NFSD_A_SVC_EXPORT_FSID] = { .type = NLA_S32, },
+};
+
 const struct nla_policy nfsd_version_nl_policy[NFSD_A_VERSION_ENABLED + 1] = {
 	[NFSD_A_VERSION_MAJOR] = { .type = NLA_U32, },
 	[NFSD_A_VERSION_MINOR] = { .type = NLA_U32, },
@@ -48,6 +78,16 @@ static const struct nla_policy nfsd_pool_mode_set_nl_policy[NFSD_A_POOL_MODE_MOD
 	[NFSD_A_POOL_MODE_MODE] = { .type = NLA_NUL_STRING, },
 };
 
+/* NFSD_CMD_SVC_EXPORT_GET_REQS - dump */
+static const struct nla_policy nfsd_svc_export_get_reqs_nl_policy[NFSD_A_SVC_EXPORT_REQS_REQUESTS + 1] = {
+	[NFSD_A_SVC_EXPORT_REQS_REQUESTS] = NLA_POLICY_NESTED(nfsd_svc_export_nl_policy),
+};
+
+/* NFSD_CMD_SVC_EXPORT_SET_REQS - do */
+static const struct nla_policy nfsd_svc_export_set_reqs_nl_policy[NFSD_A_SVC_EXPORT_REQS_REQUESTS + 1] = {
+	[NFSD_A_SVC_EXPORT_REQS_REQUESTS] = NLA_POLICY_NESTED(nfsd_svc_export_nl_policy),
+};
+
 /* Ops table for nfsd */
 static const struct genl_split_ops nfsd_nl_ops[] = {
 	{
@@ -103,6 +143,25 @@ static const struct genl_split_ops nfsd_nl_ops[] = {
 		.doit	= nfsd_nl_pool_mode_get_doit,
 		.flags	= GENL_CMD_CAP_DO,
 	},
+	{
+		.cmd		= NFSD_CMD_SVC_EXPORT_GET_REQS,
+		.dumpit		= nfsd_nl_svc_export_get_reqs_dumpit,
+		.policy		= nfsd_svc_export_get_reqs_nl_policy,
+		.maxattr	= NFSD_A_SVC_EXPORT_REQS_REQUESTS,
+		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DUMP,
+	},
+	{
+		.cmd		= NFSD_CMD_SVC_EXPORT_SET_REQS,
+		.doit		= nfsd_nl_svc_export_set_reqs_doit,
+		.policy		= nfsd_svc_export_set_reqs_nl_policy,
+		.maxattr	= NFSD_A_SVC_EXPORT_REQS_REQUESTS,
+		.flags		= GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+	},
+};
+
+static const struct genl_multicast_group nfsd_nl_mcgrps[] = {
+	[NFSD_NLGRP_NONE] = { "none", },
+	[NFSD_NLGRP_EXPORTD] = { "exportd", },
 };
 
 struct genl_family nfsd_nl_family __ro_after_init = {
@@ -113,4 +172,6 @@ struct genl_family nfsd_nl_family __ro_after_init = {
 	.module		= THIS_MODULE,
 	.split_ops	= nfsd_nl_ops,
 	.n_split_ops	= ARRAY_SIZE(nfsd_nl_ops),
+	.mcgrps		= nfsd_nl_mcgrps,
+	.n_mcgrps	= ARRAY_SIZE(nfsd_nl_mcgrps),
 };
diff --git a/fs/nfsd/netlink.h b/fs/nfsd/netlink.h
index 478117ff6b8c0d6e83d6ece09a938935e031c62b..d6ed8d9b0bb149faa4d6493ba94972addf9c26ed 100644
--- a/fs/nfsd/netlink.h
+++ b/fs/nfsd/netlink.h
@@ -13,7 +13,11 @@
 #include <uapi/linux/nfsd_netlink.h>
 
 /* Common nested types */
+extern const struct nla_policy nfsd_auth_flavor_nl_policy[NFSD_A_AUTH_FLAVOR_FLAGS + 1];
+extern const struct nla_policy nfsd_fslocation_nl_policy[NFSD_A_FSLOCATION_PATH + 1];
+extern const struct nla_policy nfsd_fslocations_nl_policy[NFSD_A_FSLOCATIONS_LOCATION + 1];
 extern const struct nla_policy nfsd_sock_nl_policy[NFSD_A_SOCK_TRANSPORT_NAME + 1];
+extern const struct nla_policy nfsd_svc_export_nl_policy[NFSD_A_SVC_EXPORT_FSID + 1];
 extern const struct nla_policy nfsd_version_nl_policy[NFSD_A_VERSION_ENABLED + 1];
 
 int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
@@ -26,6 +30,15 @@ int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info);
 int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *info);
 int nfsd_nl_pool_mode_set_doit(struct sk_buff *skb, struct genl_info *info);
 int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info);
+int nfsd_nl_svc_export_get_reqs_dumpit(struct sk_buff *skb,
+				       struct netlink_callback *cb);
+int nfsd_nl_svc_export_set_reqs_doit(struct sk_buff *skb,
+				     struct genl_info *info);
+
+enum {
+	NFSD_NLGRP_NONE,
+	NFSD_NLGRP_EXPORTD,
+};
 
 extern struct genl_family nfsd_nl_family;
 
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index dc294c4f8c58a6692b9dfbeb98fedbd649ae1b95..0f236046adfd239d0f88f4ed82a14e1a41cb6abe 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -2215,6 +2215,34 @@ int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info)
 	return err;
 }
 
+int nfsd_cache_notify(struct cache_detail *cd, struct cache_head *h, u32 cache_type)
+{
+	struct genlmsghdr *hdr;
+	struct sk_buff *msg;
+
+	if (!genl_has_listeners(&nfsd_nl_family, cd->net, NFSD_NLGRP_EXPORTD))
+		return -ENOLINK;
+
+	msg = genlmsg_new(nla_total_size(sizeof(u32)), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	hdr = genlmsg_put(msg, 0, 0, &nfsd_nl_family, 0, NFSD_CMD_CACHE_NOTIFY);
+	if (!hdr) {
+		nlmsg_free(msg);
+		return -ENOMEM;
+	}
+
+	if (nla_put_u32(msg, NFSD_A_CACHE_NOTIFY_CACHE_TYPE, cache_type)) {
+		nlmsg_free(msg);
+		return -ENOMEM;
+	}
+
+	genlmsg_end(msg, hdr);
+	return genlmsg_multicast_netns(&nfsd_nl_family, cd->net, msg, 0,
+				       NFSD_NLGRP_EXPORTD, GFP_KERNEL);
+}
+
 /**
  * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
  * @net: a freshly-created network namespace
diff --git a/fs/nfsd/nfsd.h b/fs/nfsd/nfsd.h
index 260bf8badb032de18f973556fa5deabe7e67870d..709da3c7a5fa7cdb4f5e91b488b02295c5f54392 100644
--- a/fs/nfsd/nfsd.h
+++ b/fs/nfsd/nfsd.h
@@ -108,7 +108,7 @@ struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
 				 const struct tree_descr *,
 				 struct dentry **fdentries);
 void nfsd_client_rmdir(struct dentry *dentry);
-
+int nfsd_cache_notify(struct cache_detail *cd, struct cache_head *h, u32 cache_type);
 
 #if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
 #ifdef CONFIG_NFSD_V2_ACL
diff --git a/include/uapi/linux/nfsd_netlink.h b/include/uapi/linux/nfsd_netlink.h
index 97c7447f4d14df97c1cba8cdf1f24fba0a7918b3..eae426e9c8e737a95181e7d7b0904b86fc35cff6 100644
--- a/include/uapi/linux/nfsd_netlink.h
+++ b/include/uapi/linux/nfsd_netlink.h
@@ -10,6 +10,52 @@
 #define NFSD_FAMILY_NAME	"nfsd"
 #define NFSD_FAMILY_VERSION	1
 
+enum nfsd_cache_type {
+	NFSD_CACHE_TYPE_SVC_EXPORT = 1,
+};
+
+/*
+ * These flags are ordered to match the NFSEXP_* flags in
+ * include/linux/nfsd/export.h
+ */
+enum nfsd_export_flags {
+	NFSD_EXPORT_FLAGS_READONLY = 1,
+	NFSD_EXPORT_FLAGS_INSECURE_PORT = 2,
+	NFSD_EXPORT_FLAGS_ROOTSQUASH = 4,
+	NFSD_EXPORT_FLAGS_ALLSQUASH = 8,
+	NFSD_EXPORT_FLAGS_ASYNC = 16,
+	NFSD_EXPORT_FLAGS_GATHERED_WRITES = 32,
+	NFSD_EXPORT_FLAGS_NOREADDIRPLUS = 64,
+	NFSD_EXPORT_FLAGS_SECURITY_LABEL = 128,
+	NFSD_EXPORT_FLAGS_SIGN_FH = 256,
+	NFSD_EXPORT_FLAGS_NOHIDE = 512,
+	NFSD_EXPORT_FLAGS_NOSUBTREECHECK = 1024,
+	NFSD_EXPORT_FLAGS_NOAUTHNLM = 2048,
+	NFSD_EXPORT_FLAGS_MSNFS = 4096,
+	NFSD_EXPORT_FLAGS_FSID = 8192,
+	NFSD_EXPORT_FLAGS_CROSSMOUNT = 16384,
+	NFSD_EXPORT_FLAGS_NOACL = 32768,
+	NFSD_EXPORT_FLAGS_V4ROOT = 65536,
+	NFSD_EXPORT_FLAGS_PNFS = 131072,
+};
+
+/*
+ * These flags are ordered to match the NFSEXP_XPRTSEC_* flags in
+ * include/linux/nfsd/export.h
+ */
+enum nfsd_xprtsec_mode {
+	NFSD_XPRTSEC_MODE_NONE = 1,
+	NFSD_XPRTSEC_MODE_TLS = 2,
+	NFSD_XPRTSEC_MODE_MTLS = 4,
+};
+
+enum {
+	NFSD_A_CACHE_NOTIFY_CACHE_TYPE = 1,
+
+	__NFSD_A_CACHE_NOTIFY_MAX,
+	NFSD_A_CACHE_NOTIFY_MAX = (__NFSD_A_CACHE_NOTIFY_MAX - 1)
+};
+
 enum {
 	NFSD_A_RPC_STATUS_XID = 1,
 	NFSD_A_RPC_STATUS_FLAGS,
@@ -81,6 +127,64 @@ enum {
 	NFSD_A_POOL_MODE_MAX = (__NFSD_A_POOL_MODE_MAX - 1)
 };
 
+enum {
+	NFSD_A_FSLOCATION_HOST = 1,
+	NFSD_A_FSLOCATION_PATH,
+
+	__NFSD_A_FSLOCATION_MAX,
+	NFSD_A_FSLOCATION_MAX = (__NFSD_A_FSLOCATION_MAX - 1)
+};
+
+enum {
+	NFSD_A_FSLOCATIONS_LOCATION = 1,
+
+	__NFSD_A_FSLOCATIONS_MAX,
+	NFSD_A_FSLOCATIONS_MAX = (__NFSD_A_FSLOCATIONS_MAX - 1)
+};
+
+enum {
+	NFSD_A_AUTH_FLAVOR_PSEUDOFLAVOR = 1,
+	NFSD_A_AUTH_FLAVOR_FLAGS,
+
+	__NFSD_A_AUTH_FLAVOR_MAX,
+	NFSD_A_AUTH_FLAVOR_MAX = (__NFSD_A_AUTH_FLAVOR_MAX - 1)
+};
+
+enum {
+	NFSD_A_SVC_EXPORT_REQ_SEQNO = 1,
+	NFSD_A_SVC_EXPORT_REQ_CLIENT,
+	NFSD_A_SVC_EXPORT_REQ_PATH,
+
+	__NFSD_A_SVC_EXPORT_REQ_MAX,
+	NFSD_A_SVC_EXPORT_REQ_MAX = (__NFSD_A_SVC_EXPORT_REQ_MAX - 1)
+};
+
+enum {
+	NFSD_A_SVC_EXPORT_SEQNO = 1,
+	NFSD_A_SVC_EXPORT_CLIENT,
+	NFSD_A_SVC_EXPORT_PATH,
+	NFSD_A_SVC_EXPORT_NEGATIVE,
+	NFSD_A_SVC_EXPORT_EXPIRY,
+	NFSD_A_SVC_EXPORT_ANON_UID,
+	NFSD_A_SVC_EXPORT_ANON_GID,
+	NFSD_A_SVC_EXPORT_FSLOCATIONS,
+	NFSD_A_SVC_EXPORT_UUID,
+	NFSD_A_SVC_EXPORT_SECINFO,
+	NFSD_A_SVC_EXPORT_XPRTSEC,
+	NFSD_A_SVC_EXPORT_FLAGS,
+	NFSD_A_SVC_EXPORT_FSID,
+
+	__NFSD_A_SVC_EXPORT_MAX,
+	NFSD_A_SVC_EXPORT_MAX = (__NFSD_A_SVC_EXPORT_MAX - 1)
+};
+
+enum {
+	NFSD_A_SVC_EXPORT_REQS_REQUESTS = 1,
+
+	__NFSD_A_SVC_EXPORT_REQS_MAX,
+	NFSD_A_SVC_EXPORT_REQS_MAX = (__NFSD_A_SVC_EXPORT_REQS_MAX - 1)
+};
+
 enum {
 	NFSD_CMD_RPC_STATUS_GET = 1,
 	NFSD_CMD_THREADS_SET,
@@ -91,9 +195,15 @@ enum {
 	NFSD_CMD_LISTENER_GET,
 	NFSD_CMD_POOL_MODE_SET,
 	NFSD_CMD_POOL_MODE_GET,
+	NFSD_CMD_CACHE_NOTIFY,
+	NFSD_CMD_SVC_EXPORT_GET_REQS,
+	NFSD_CMD_SVC_EXPORT_SET_REQS,
 
 	__NFSD_CMD_MAX,
 	NFSD_CMD_MAX = (__NFSD_CMD_MAX - 1)
 };
 
+#define NFSD_MCGRP_NONE		"none"
+#define NFSD_MCGRP_EXPORTD	"exportd"
+
 #endif /* _UAPI_LINUX_NFSD_NETLINK_H */
diff --git a/net/sunrpc/netlink.c b/net/sunrpc/netlink.c
index 41843f007c37a3ccb6480d11ec31de201c5aa5e7..3ac6b0cac5fece964f6e6591f90d074f40e96af1 100644
--- a/net/sunrpc/netlink.c
+++ b/net/sunrpc/netlink.c
@@ -6,7 +6,6 @@
 
 #include <net/netlink.h>
 #include <net/genetlink.h>
-#include <linux/sunrpc/cache.h>
 
 #include "netlink.h"
 
@@ -22,6 +21,14 @@ const struct nla_policy sunrpc_ip_map_nl_policy[SUNRPC_A_IP_MAP_EXPIRY + 1] = {
 	[SUNRPC_A_IP_MAP_EXPIRY] = { .type = NLA_U64, },
 };
 
+const struct nla_policy sunrpc_unix_gid_nl_policy[SUNRPC_A_UNIX_GID_EXPIRY + 1] = {
+	[SUNRPC_A_UNIX_GID_SEQNO] = { .type = NLA_U64, },
+	[SUNRPC_A_UNIX_GID_UID] = { .type = NLA_U32, },
+	[SUNRPC_A_UNIX_GID_GIDS] = { .type = NLA_U32, },
+	[SUNRPC_A_UNIX_GID_NEGATIVE] = { .type = NLA_FLAG, },
+	[SUNRPC_A_UNIX_GID_EXPIRY] = { .type = NLA_U64, },
+};
+
 /* SUNRPC_CMD_IP_MAP_GET_REQS - dump */
 static const struct nla_policy sunrpc_ip_map_get_reqs_nl_policy[SUNRPC_A_IP_MAP_REQS_REQUESTS + 1] = {
 	[SUNRPC_A_IP_MAP_REQS_REQUESTS] = NLA_POLICY_NESTED(sunrpc_ip_map_nl_policy),
@@ -32,14 +39,6 @@ static const struct nla_policy sunrpc_ip_map_set_reqs_nl_policy[SUNRPC_A_IP_MAP_
 	[SUNRPC_A_IP_MAP_REQS_REQUESTS] = NLA_POLICY_NESTED(sunrpc_ip_map_nl_policy),
 };
 
-const struct nla_policy sunrpc_unix_gid_nl_policy[SUNRPC_A_UNIX_GID_EXPIRY + 1] = {
-	[SUNRPC_A_UNIX_GID_SEQNO] = { .type = NLA_U64, },
-	[SUNRPC_A_UNIX_GID_UID] = { .type = NLA_U32, },
-	[SUNRPC_A_UNIX_GID_GIDS] = { .type = NLA_U32, },
-	[SUNRPC_A_UNIX_GID_NEGATIVE] = { .type = NLA_FLAG, },
-	[SUNRPC_A_UNIX_GID_EXPIRY] = { .type = NLA_U64, },
-};
-
 /* SUNRPC_CMD_UNIX_GID_GET_REQS - dump */
 static const struct nla_policy sunrpc_unix_gid_get_reqs_nl_policy[SUNRPC_A_UNIX_GID_REQS_REQUESTS + 1] = {
 	[SUNRPC_A_UNIX_GID_REQS_REQUESTS] = NLA_POLICY_NESTED(sunrpc_unix_gid_nl_policy),
diff --git a/net/sunrpc/netlink.h b/net/sunrpc/netlink.h
index 16b87519a4096a72798e686dc20d2702ef329e52..2aec57d27a586e4c6b2fc65c7b4505b0996d9577 100644
--- a/net/sunrpc/netlink.h
+++ b/net/sunrpc/netlink.h
@@ -18,8 +18,7 @@ extern const struct nla_policy sunrpc_unix_gid_nl_policy[SUNRPC_A_UNIX_GID_EXPIR
 
 int sunrpc_nl_ip_map_get_reqs_dumpit(struct sk_buff *skb,
 				     struct netlink_callback *cb);
-int sunrpc_nl_ip_map_set_reqs_doit(struct sk_buff *skb,
-				   struct genl_info *info);
+int sunrpc_nl_ip_map_set_reqs_doit(struct sk_buff *skb, struct genl_info *info);
 int sunrpc_nl_unix_gid_get_reqs_dumpit(struct sk_buff *skb,
 				       struct netlink_callback *cb);
 int sunrpc_nl_unix_gid_set_reqs_doit(struct sk_buff *skb,

-- 
2.53.0

On Wed, Mar 25, 2026, at 10:40 AM, Jeff Layton wrote:
> Add netlink-based cache upcall support for the svc_export (nfsd.export)
> cache to Documentation/netlink/specs/nfsd.yaml and regenerate the
> resulting files.

> diff --git a/Documentation/netlink/specs/nfsd.yaml 
> b/Documentation/netlink/specs/nfsd.yaml
> index 
> 8ab43c8253b2e83bcc178c3f4fe8c41c2997d153..709751502f8b56bd4b68462fa15337df5e3e035e 
> 100644
> --- a/Documentation/netlink/specs/nfsd.yaml
> +++ b/Documentation/netlink/specs/nfsd.yaml
> @@ -6,7 +6,51 @@ uapi-header: linux/nfsd_netlink.h
> 
>  doc: NFSD configuration over generic netlink.
> 
> +definitions:
> +  -
> +    type: flags
> +    name: cache-type
> +    entries: [svc_export]
> +  -
> +    type: flags
> +    name: export-flags
> +    doc: These flags are ordered to match the NFSEXP_* flags in 
> include/linux/nfsd/export.h
> +    entries:
> +      - readonly
> +      - insecure-port
> +      - rootsquash
> +      - allsquash
> +      - async
> +      - gathered-writes
> +      - noreaddirplus
> +      - security-label
> +      - sign-fh
> +      - nohide
> +      - nosubtreecheck
> +      - noauthnlm
> +      - msnfs
> +      - fsid
> +      - crossmount
> +      - noacl
> +      - v4root
> +      - pnfs
> +  -
> +    type: flags
> +    name: xprtsec-mode
> +    doc: These flags are ordered to match the NFSEXP_XPRTSEC_* flags 
> in include/linux/nfsd/export.h
> +    entries:
> +      - none
> +      - tls
> +      - mtls
> +
>  attribute-sets:
> +  -
> +    name: cache-notify
> +    attributes:
> +      -
> +        name: cache-type
> +        type: u32
> +        enum: cache-type
>    -
>      name: rpc-status
>      attributes:
> @@ -132,6 +176,103 @@ attribute-sets:
>        -
>          name: npools
>          type: u32
> +  -
> +    name: fslocation
> +    attributes:
> +      -
> +        name: host
> +        type: string
> +      -
> +        name: path
> +        type: string
> +  -
> +    name: fslocations
> +    attributes:
> +      -
> +        name: location
> +        type: nest
> +        nested-attributes: fslocation
> +        multi-attr: true
> +  -
> +    name: auth-flavor
> +    attributes:
> +      -
> +        name: pseudoflavor
> +        type: u32
> +      -
> +        name: flags
> +        type: u32
> +        enum: export-flags
> +        enum-as-flags: true
> +  -
> +    name: svc-export-req
> +    attributes:
> +      -
> +        name: seqno
> +        type: u64
> +      -
> +        name: client
> +        type: string
> +      -
> +        name: path
> +        type: string

Is the svc-export-req attribute set used for anything?


> +  -
> +    name: svc-export
> +    attributes:
> +      -
> +        name: seqno
> +        type: u64
> +      -
> +        name: client
> +        type: string
> +      -
> +        name: path
> +        type: string
> +      -
> +        name: negative
> +        type: flag
> +      -
> +        name: expiry
> +        type: u64
> +      -
> +        name: anon-uid
> +        type: u32
> +      -
> +        name: anon-gid
> +        type: u32
> +      -
> +        name: fslocations
> +        type: nest
> +        nested-attributes: fslocations
> +      -
> +        name: uuid
> +        type: binary
> +      -
> +        name: secinfo
> +        type: nest
> +        nested-attributes: auth-flavor
> +        multi-attr: true
> +      -
> +        name: xprtsec
> +        type: u32
> +        enum: xprtsec-mode
> +        multi-attr: true
> +      -
> +        name: flags
> +        type: u32
> +        enum: export-flags
> +        enum-as-flags: true
> +      -
> +        name: fsid
> +        type: s32
> +  -
> +    name: svc-export-reqs
> +    attributes:
> +      -
> +        name: requests
> +        type: nest
> +        nested-attributes: svc-export
> +        multi-attr: true
> 
>  operations:
>    list:
> @@ -233,3 +374,36 @@ operations:
>            attributes:
>              - mode
>              - npools
> +    -
> +      name: cache-notify
> +      doc: Notification that there are cache requests that need 
> servicing
> +      attribute-set: cache-notify
> +      mcgrp: exportd
> +      event:
> +        attributes:
> +          - cache-type
> +    -
> +      name: svc-export-get-reqs
> +      doc: Dump all pending svc_export requests
> +      attribute-set: svc-export-reqs
> +      flags: [admin-perm]
> +      dump:
> +          request:
> +            attributes:
> +              - requests
> +    -
> +      name: svc-export-set-reqs
> +      doc: Respond to one or more svc_export requests
> +      attribute-set: svc-export-reqs
> +      flags: [admin-perm]
> +      do:
> +          request:
> +            attributes:
> +              - requests
> +
> +mcast-groups:
> +  list:
> +    -
> +      name: none
> +    -
> +      name: exportd


-- 
Chuck Lever

On Mon, 2026-03-30 at 10:22 -0400, Chuck Lever wrote:
> > 
> > +  -
> > +    name: svc-export-req
> > +    attributes:
> > +      -
> > +        name: seqno
> > +        type: u64
> > +      -
> > +        name: client
> > +        type: string
> > +      -
> > +        name: path
> > +        type: string
> 
> Is the svc-export-req attribute set used for anything?
> 
> 

No, good catch.

That's a holdover from an earlier version that had a separate attribute
set for the up and downcalls. It's not needed in the latest version.

It should be fine to remove it and regenerate the headers. The result
builds fine without it. I've pushed a fixed patch to the 'exportd-nl'
branch in my tree. You can fix it up or I can resend if you prefer.

Thanks,
-- 
Jeff Layton <jlayton@kernel.org>

On Mon, Mar 30, 2026, at 10:49 AM, Jeff Layton wrote:
> On Mon, 2026-03-30 at 10:22 -0400, Chuck Lever wrote:
>> > 
>> > +  -
>> > +    name: svc-export-req
>> > +    attributes:
>> > +      -
>> > +        name: seqno
>> > +        type: u64
>> > +      -
>> > +        name: client
>> > +        type: string
>> > +      -
>> > +        name: path
>> > +        type: string
>> 
>> Is the svc-export-req attribute set used for anything?
>> 
>> 
>
> No, good catch.
>
> That's a holdover from an earlier version that had a separate attribute
> set for the up and downcalls. It's not needed in the latest version.
>
> It should be fine to remove it and regenerate the headers. The result
> builds fine without it. I've pushed a fixed patch to the 'exportd-nl'
> branch in my tree. You can fix it up or I can resend if you prefer.

Thanks for jumping on that. Let's wait to see if there are other review
comments.


-- 
Chuck Lever