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Jeff Layton
36ed32f46e
Implement nfsd_nl_server_stats_get_dumpit() which exposes the
NFS server statistics currently available via /proc/net/rpc/nfsd
through the nfsd generic netlink family.
The handler uses a dump operation to stream statistics across one
or more netlink messages. The reply is divided into sections that
are emitted in order:
- scalar stats (reply cache, filehandle, IO, network, RPC),
emitted once in the first message, then
- per-version procedure counts (proc2/3/4-ops) and the NFSv4
per-operation counts (proc4ops-ops), using the per-netns
vs_count arrays.
cb->args[0] tracks the current section and cb->args[1] the entry
index within it, so a section that does not fit in the current
message is closed and resumed in the next one. This matters because
the first dump message is allocated at NLMSG_GOODSIZE (a single page
on most architectures) regardless of the client's receive buffer;
packing every counter into one message would overflow it and fail
the dump with -EMSGSIZE. Userspace merges the attributes from every
message.
This allows nfsstat to retrieve server statistics via netlink
with a procfs fallback for older kernels.
Assisted-by: LLM
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Link: https://patch.msgid.link/20260717-exportd-netlink-v7-3-b7ce17b83b60@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>
56 lines
2.6 KiB
C
56 lines
2.6 KiB
C
/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) */
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/* Do not edit directly, auto-generated from: */
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/* Documentation/netlink/specs/nfsd.yaml */
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/* YNL-GEN kernel header */
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/* To regenerate run: tools/net/ynl/ynl-regen.sh */
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#ifndef _LINUX_NFSD_GEN_H
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#define _LINUX_NFSD_GEN_H
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <uapi/linux/nfsd_netlink.h>
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/* Common nested types */
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extern const struct nla_policy nfsd_auth_flavor_nl_policy[NFSD_A_AUTH_FLAVOR_FLAGS + 1];
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extern const struct nla_policy nfsd_expkey_nl_policy[NFSD_A_EXPKEY_PATH + 1];
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extern const struct nla_policy nfsd_fslocation_nl_policy[NFSD_A_FSLOCATION_PATH + 1];
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extern const struct nla_policy nfsd_fslocations_nl_policy[NFSD_A_FSLOCATIONS_LOCATION + 1];
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extern const struct nla_policy nfsd_sock_nl_policy[NFSD_A_SOCK_TRANSPORT_NAME + 1];
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extern const struct nla_policy nfsd_svc_export_nl_policy[NFSD_A_SVC_EXPORT_FSID + 1];
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extern const struct nla_policy nfsd_version_nl_policy[NFSD_A_VERSION_ENABLED + 1];
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int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_version_set_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_version_get_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_pool_mode_set_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_svc_export_get_reqs_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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int nfsd_nl_svc_export_set_reqs_doit(struct sk_buff *skb,
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struct genl_info *info);
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int nfsd_nl_expkey_get_reqs_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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int nfsd_nl_expkey_set_reqs_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_cache_flush_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_unlock_ip_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_unlock_filesystem_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_unlock_export_doit(struct sk_buff *skb, struct genl_info *info);
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int nfsd_nl_server_stats_get_dumpit(struct sk_buff *skb,
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struct netlink_callback *cb);
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enum {
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NFSD_NLGRP_NONE,
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NFSD_NLGRP_EXPORTD,
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};
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extern struct genl_family nfsd_nl_family;
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#endif /* _LINUX_NFSD_GEN_H */
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