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Message-ID: <5e6ec472d58f9945a936f16c0ebf2e1e089e7ae0.1713878413.git.lorenzo@kernel.org>
Date: Tue, 23 Apr 2024 15:25:40 +0200
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: linux-nfs@...r.kernel.org
Cc: neilb@...e.de,
lorenzo.bianconi@...hat.com,
chuck.lever@...cle.com,
netdev@...r.kernel.org,
kuba@...nel.org,
jlayton@...nel.org
Subject: [PATCH v9 3/7] NFSD: convert write_threads to netlink command
Introduce write_threads netlink command similar to the one available
through the procfs.
Tested-by: Jeff Layton <jlayton@...nel.org>
Reviewed-by: Jeff Layton <jlayton@...nel.org>
Co-developed-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Jeff Layton <jlayton@...nel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
Documentation/netlink/specs/nfsd.yaml | 39 +++++++
fs/nfsd/netlink.c | 20 ++++
fs/nfsd/netlink.h | 2 +
fs/nfsd/nfsctl.c | 143 ++++++++++++++++++++++++++
include/uapi/linux/nfsd_netlink.h | 12 +++
5 files changed, 216 insertions(+)
diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlink/specs/nfsd.yaml
index 05acc73e2e33..703c2d11d0a9 100644
--- a/Documentation/netlink/specs/nfsd.yaml
+++ b/Documentation/netlink/specs/nfsd.yaml
@@ -62,6 +62,22 @@ attribute-sets:
name: compound-ops
type: u32
multi-attr: true
+ -
+ name: server
+ attributes:
+ -
+ name: threads
+ type: u32
+ multi-attr: true
+ -
+ name: gracetime
+ type: u32
+ -
+ name: leasetime
+ type: u32
+ -
+ name: scope
+ type: string
operations:
list:
@@ -87,3 +103,26 @@ operations:
- sport
- dport
- compound-ops
+ -
+ name: threads-set
+ doc: set the number of running threads
+ attribute-set: server
+ flags: [ admin-perm ]
+ do:
+ request:
+ attributes:
+ - threads
+ - gracetime
+ - leasetime
+ - scope
+ -
+ name: threads-get
+ doc: get the number of running threads
+ attribute-set: server
+ do:
+ reply:
+ attributes:
+ - threads
+ - gracetime
+ - leasetime
+ - scope
diff --git a/fs/nfsd/netlink.c b/fs/nfsd/netlink.c
index 0e1d635ec5f9..fe9eef5c7f27 100644
--- a/fs/nfsd/netlink.c
+++ b/fs/nfsd/netlink.c
@@ -10,6 +10,14 @@
#include <uapi/linux/nfsd_netlink.h>
+/* NFSD_CMD_THREADS_SET - do */
+static const struct nla_policy nfsd_threads_set_nl_policy[NFSD_A_SERVER_SCOPE + 1] = {
+ [NFSD_A_SERVER_THREADS] = { .type = NLA_U32, },
+ [NFSD_A_SERVER_GRACETIME] = { .type = NLA_U32, },
+ [NFSD_A_SERVER_LEASETIME] = { .type = NLA_U32, },
+ [NFSD_A_SERVER_SCOPE] = { .type = NLA_NUL_STRING, },
+};
+
/* Ops table for nfsd */
static const struct genl_split_ops nfsd_nl_ops[] = {
{
@@ -19,6 +27,18 @@ static const struct genl_split_ops nfsd_nl_ops[] = {
.done = nfsd_nl_rpc_status_get_done,
.flags = GENL_CMD_CAP_DUMP,
},
+ {
+ .cmd = NFSD_CMD_THREADS_SET,
+ .doit = nfsd_nl_threads_set_doit,
+ .policy = nfsd_threads_set_nl_policy,
+ .maxattr = NFSD_A_SERVER_SCOPE,
+ .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO,
+ },
+ {
+ .cmd = NFSD_CMD_THREADS_GET,
+ .doit = nfsd_nl_threads_get_doit,
+ .flags = GENL_CMD_CAP_DO,
+ },
};
struct genl_family nfsd_nl_family __ro_after_init = {
diff --git a/fs/nfsd/netlink.h b/fs/nfsd/netlink.h
index d83dd6bdee92..4137fac477e4 100644
--- a/fs/nfsd/netlink.h
+++ b/fs/nfsd/netlink.h
@@ -16,6 +16,8 @@ int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb);
int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb,
struct netlink_callback *cb);
+int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info);
+int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info);
extern struct genl_family nfsd_nl_family;
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 34148d73b6c1..5bfdebb2e7e9 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -15,6 +15,7 @@
#include <linux/sunrpc/addr.h>
#include <linux/sunrpc/gss_api.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
+#include <linux/sunrpc/svc.h>
#include <linux/module.h>
#include <linux/fsnotify.h>
@@ -1653,6 +1654,148 @@ int nfsd_nl_rpc_status_get_done(struct netlink_callback *cb)
return 0;
}
+/**
+ * nfsd_nl_threads_set_doit - set the number of running threads
+ * @skb: reply buffer
+ * @info: netlink metadata and command arguments
+ *
+ * Return 0 on success or a negative errno.
+ */
+int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ int nthreads = 0, count = 0, nrpools, ret = -EOPNOTSUPP, rem;
+ struct net *net = genl_info_net(info);
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ const struct nlattr *attr;
+ const char *scope = NULL;
+
+ if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_THREADS))
+ return -EINVAL;
+
+ /* count number of SERVER_THREADS values */
+ nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) {
+ if (nla_type(attr) == NFSD_A_SERVER_THREADS)
+ count++;
+ }
+
+ mutex_lock(&nfsd_mutex);
+
+ nrpools = nfsd_nrpools(net);
+ if (nrpools && count > nrpools)
+ count = nrpools;
+
+ /* XXX: make this handle non-global pool-modes */
+ if (count > 1)
+ goto out_unlock;
+
+ nthreads = nla_get_u32(info->attrs[NFSD_A_SERVER_THREADS]);
+ if (info->attrs[NFSD_A_SERVER_GRACETIME] ||
+ info->attrs[NFSD_A_SERVER_LEASETIME] ||
+ info->attrs[NFSD_A_SERVER_SCOPE]) {
+ ret = -EBUSY;
+ if (nn->nfsd_serv && nn->nfsd_serv->sv_nrthreads)
+ goto out_unlock;
+
+ ret = -EINVAL;
+ attr = info->attrs[NFSD_A_SERVER_GRACETIME];
+ if (attr) {
+ u32 gracetime = nla_get_u32(attr);
+
+ if (gracetime < 10 || gracetime > 3600)
+ goto out_unlock;
+
+ nn->nfsd4_grace = gracetime;
+ }
+
+ attr = info->attrs[NFSD_A_SERVER_LEASETIME];
+ if (attr) {
+ u32 leasetime = nla_get_u32(attr);
+
+ if (leasetime < 10 || leasetime > 3600)
+ goto out_unlock;
+
+ nn->nfsd4_lease = leasetime;
+ }
+
+ attr = info->attrs[NFSD_A_SERVER_SCOPE];
+ if (attr)
+ scope = nla_data(attr);
+ }
+
+ ret = nfsd_svc(nthreads, net, get_current_cred(), scope);
+
+out_unlock:
+ mutex_unlock(&nfsd_mutex);
+
+ return ret == nthreads ? 0 : ret;
+}
+
+/**
+ * nfsd_nl_threads_get_doit - get the number of running threads
+ * @skb: reply buffer
+ * @info: netlink metadata and command arguments
+ *
+ * Return 0 on success or a negative errno.
+ */
+int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ void *hdr;
+ int err;
+
+ skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!skb)
+ return -ENOMEM;
+
+ hdr = genlmsg_iput(skb, info);
+ if (!hdr) {
+ err = -EMSGSIZE;
+ goto err_free_msg;
+ }
+
+ mutex_lock(&nfsd_mutex);
+
+ err = nla_put_u32(skb, NFSD_A_SERVER_GRACETIME,
+ nn->nfsd4_grace) ||
+ nla_put_u32(skb, NFSD_A_SERVER_LEASETIME,
+ nn->nfsd4_lease) ||
+ nla_put_string(skb, NFSD_A_SERVER_SCOPE,
+ nn->nfsd_name);
+ if (err)
+ goto err_unlock;
+
+ if (nn->nfsd_serv) {
+ int i;
+
+ for (i = 0; i < nfsd_nrpools(net); ++i) {
+ struct svc_pool *sp = &nn->nfsd_serv->sv_pools[i];
+
+ err = nla_put_u32(skb, NFSD_A_SERVER_THREADS,
+ atomic_read(&sp->sp_nrthreads));
+ if (err)
+ goto err_unlock;
+ }
+ } else {
+ err = nla_put_u32(skb, NFSD_A_SERVER_THREADS, 0);
+ if (err)
+ goto err_unlock;
+ }
+
+ mutex_unlock(&nfsd_mutex);
+
+ genlmsg_end(skb, hdr);
+
+ return genlmsg_reply(skb, info);
+
+err_unlock:
+ mutex_unlock(&nfsd_mutex);
+err_free_msg:
+ nlmsg_free(skb);
+
+ return err;
+}
+
/**
* nfsd_net_init - Prepare the nfsd_net portion of a new net namespace
* @net: a freshly-created network namespace
diff --git a/include/uapi/linux/nfsd_netlink.h b/include/uapi/linux/nfsd_netlink.h
index 3cd044edee5d..4bbccd5db7cd 100644
--- a/include/uapi/linux/nfsd_netlink.h
+++ b/include/uapi/linux/nfsd_netlink.h
@@ -29,8 +29,20 @@ enum {
NFSD_A_RPC_STATUS_MAX = (__NFSD_A_RPC_STATUS_MAX - 1)
};
+enum {
+ NFSD_A_SERVER_THREADS = 1,
+ NFSD_A_SERVER_GRACETIME,
+ NFSD_A_SERVER_LEASETIME,
+ NFSD_A_SERVER_SCOPE,
+
+ __NFSD_A_SERVER_MAX,
+ NFSD_A_SERVER_MAX = (__NFSD_A_SERVER_MAX - 1)
+};
+
enum {
NFSD_CMD_RPC_STATUS_GET = 1,
+ NFSD_CMD_THREADS_SET,
+ NFSD_CMD_THREADS_GET,
__NFSD_CMD_MAX,
NFSD_CMD_MAX = (__NFSD_CMD_MAX - 1)
--
2.44.0
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