Introduce write_threads, write_maxblksize and write_maxconn netlink commands similar to the ones available through the procfs. Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx> --- Changes since v2: - use u32 to store nthreads in nfsd_nl_threads_set_doit - rename server-attr in control-plane in nfsd.yaml specs Changes since v1: - remove write_v4_end_grace command - add write_maxblksize and write_maxconn netlink commands This patch can be tested with user-space tool reported below: https://github.com/LorenzoBianconi/nfsd-netlink.git --- Documentation/netlink/specs/nfsd.yaml | 63 ++++++++++++ fs/nfsd/netlink.c | 51 ++++++++++ fs/nfsd/netlink.h | 9 ++ fs/nfsd/nfsctl.c | 141 ++++++++++++++++++++++++++ include/uapi/linux/nfsd_netlink.h | 15 +++ 5 files changed, 279 insertions(+) diff --git a/Documentation/netlink/specs/nfsd.yaml b/Documentation/netlink/specs/nfsd.yaml index 403d3e3a04f3..c6af1653bc1d 100644 --- a/Documentation/netlink/specs/nfsd.yaml +++ b/Documentation/netlink/specs/nfsd.yaml @@ -62,6 +62,18 @@ attribute-sets: name: compound-ops type: u32 multi-attr: true + - + name: control-plane + attributes: + - + name: threads + type: u32 + - + name: max-blksize + type: u32 + - + name: max-conn + type: u32 operations: list: @@ -72,3 +84,54 @@ operations: dump: pre: nfsd-nl-rpc-status-get-start post: nfsd-nl-rpc-status-get-done + - + name: threads-set + doc: set the number of running threads + attribute-set: control-plane + flags: [ admin-perm ] + do: + request: + attributes: + - threads + - + name: threads-get + doc: dump the number of running threads + attribute-set: control-plane + dump: + reply: + attributes: + - threads + - + name: max-blksize-set + doc: set the nfs block size + attribute-set: control-plane + flags: [ admin-perm ] + do: + request: + attributes: + - max-blksize + - + name: max-blksize-get + doc: dump the nfs block size + attribute-set: control-plane + dump: + reply: + attributes: + - max-blksize + - + name: max-conn-set + doc: set the max number of connections + attribute-set: control-plane + flags: [ admin-perm ] + do: + request: + attributes: + - max-conn + - + name: max-conn-get + doc: dump the max number of connections + attribute-set: control-plane + dump: + reply: + attributes: + - max-conn diff --git a/fs/nfsd/netlink.c b/fs/nfsd/netlink.c index 0e1d635ec5f9..8f7d72ae60d6 100644 --- a/fs/nfsd/netlink.c +++ b/fs/nfsd/netlink.c @@ -10,6 +10,21 @@ #include <uapi/linux/nfsd_netlink.h> +/* NFSD_CMD_THREADS_SET - do */ +static const struct nla_policy nfsd_threads_set_nl_policy[NFSD_A_CONTROL_PLANE_THREADS + 1] = { + [NFSD_A_CONTROL_PLANE_THREADS] = { .type = NLA_U32, }, +}; + +/* NFSD_CMD_MAX_BLKSIZE_SET - do */ +static const struct nla_policy nfsd_max_blksize_set_nl_policy[NFSD_A_CONTROL_PLANE_MAX_BLKSIZE + 1] = { + [NFSD_A_CONTROL_PLANE_MAX_BLKSIZE] = { .type = NLA_U32, }, +}; + +/* NFSD_CMD_MAX_CONN_SET - do */ +static const struct nla_policy nfsd_max_conn_set_nl_policy[NFSD_A_CONTROL_PLANE_MAX_CONN + 1] = { + [NFSD_A_CONTROL_PLANE_MAX_CONN] = { .type = NLA_U32, }, +}; + /* Ops table for nfsd */ static const struct genl_split_ops nfsd_nl_ops[] = { { @@ -19,6 +34,42 @@ 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_CONTROL_PLANE_THREADS, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, + }, + { + .cmd = NFSD_CMD_THREADS_GET, + .dumpit = nfsd_nl_threads_get_dumpit, + .flags = GENL_CMD_CAP_DUMP, + }, + { + .cmd = NFSD_CMD_MAX_BLKSIZE_SET, + .doit = nfsd_nl_max_blksize_set_doit, + .policy = nfsd_max_blksize_set_nl_policy, + .maxattr = NFSD_A_CONTROL_PLANE_MAX_BLKSIZE, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, + }, + { + .cmd = NFSD_CMD_MAX_BLKSIZE_GET, + .dumpit = nfsd_nl_max_blksize_get_dumpit, + .flags = GENL_CMD_CAP_DUMP, + }, + { + .cmd = NFSD_CMD_MAX_CONN_SET, + .doit = nfsd_nl_max_conn_set_doit, + .policy = nfsd_max_conn_set_nl_policy, + .maxattr = NFSD_A_CONTROL_PLANE_MAX_CONN, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, + }, + { + .cmd = NFSD_CMD_MAX_CONN_GET, + .dumpit = nfsd_nl_max_conn_get_dumpit, + .flags = GENL_CMD_CAP_DUMP, + }, }; struct genl_family nfsd_nl_family __ro_after_init = { diff --git a/fs/nfsd/netlink.h b/fs/nfsd/netlink.h index d83dd6bdee92..41b95651c638 100644 --- a/fs/nfsd/netlink.h +++ b/fs/nfsd/netlink.h @@ -16,6 +16,15 @@ 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_dumpit(struct sk_buff *skb, + struct netlink_callback *cb); +int nfsd_nl_max_blksize_set_doit(struct sk_buff *skb, struct genl_info *info); +int nfsd_nl_max_blksize_get_dumpit(struct sk_buff *skb, + struct netlink_callback *cb); +int nfsd_nl_max_conn_set_doit(struct sk_buff *skb, struct genl_info *info); +int nfsd_nl_max_conn_get_dumpit(struct sk_buff *skb, + struct netlink_callback *cb); extern struct genl_family nfsd_nl_family; diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c index b71744e355a8..07e7a09e28e3 100644 --- a/fs/nfsd/nfsctl.c +++ b/fs/nfsd/nfsctl.c @@ -1694,6 +1694,147 @@ 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) +{ + u32 nthreads; + int ret; + + if (!info->attrs[NFSD_A_CONTROL_PLANE_THREADS]) + return -EINVAL; + + nthreads = nla_get_u32(info->attrs[NFSD_A_CONTROL_PLANE_THREADS]); + + ret = nfsd_svc(nthreads, genl_info_net(info), get_current_cred()); + return ret == nthreads ? 0 : ret; +} + +static int nfsd_nl_get_dump(struct sk_buff *skb, struct netlink_callback *cb, + int cmd, int attr, u32 val) +{ + void *hdr; + + if (cb->args[0]) /* already consumed */ + return 0; + + hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, + &nfsd_nl_family, NLM_F_MULTI, cmd); + if (!hdr) + return -ENOBUFS; + + if (nla_put_u32(skb, attr, val)) + return -ENOBUFS; + + genlmsg_end(skb, hdr); + cb->args[0] = 1; + + return skb->len; +} + +/** + * nfsd_nl_threads_get_dumpit - dump the number of running threads + * @skb: reply buffer + * @cb: netlink metadata and command arguments + * + * Returns the size of the reply or a negative errno. + */ +int nfsd_nl_threads_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) +{ + return nfsd_nl_get_dump(skb, cb, NFSD_CMD_THREADS_GET, + NFSD_A_CONTROL_PLANE_THREADS, + nfsd_nrthreads(sock_net(skb->sk))); +} + +/** + * nfsd_nl_max_blksize_set_doit - set the nfs block size + * @skb: reply buffer + * @info: netlink metadata and command arguments + * + * Return 0 on success or a negative errno. + */ +int nfsd_nl_max_blksize_set_doit(struct sk_buff *skb, struct genl_info *info) +{ + struct nfsd_net *nn = net_generic(genl_info_net(info), nfsd_net_id); + struct nlattr *attr = info->attrs[NFSD_A_CONTROL_PLANE_MAX_BLKSIZE]; + int ret = 0; + + if (!attr) + return -EINVAL; + + mutex_lock(&nfsd_mutex); + if (nn->nfsd_serv) { + ret = -EBUSY; + goto out; + } + + nfsd_max_blksize = nla_get_u32(attr); + nfsd_max_blksize = max_t(int, nfsd_max_blksize, 1024); + nfsd_max_blksize = min_t(int, nfsd_max_blksize, NFSSVC_MAXBLKSIZE); + nfsd_max_blksize &= ~1023; +out: + mutex_unlock(&nfsd_mutex); + + return ret; +} + +/** + * nfsd_nl_max_blksize_get_dumpit - dump the nfs block size + * @skb: reply buffer + * @cb: netlink metadata and command arguments + * + * Returns the size of the reply or a negative errno. + */ +int nfsd_nl_max_blksize_get_dumpit(struct sk_buff *skb, + struct netlink_callback *cb) +{ + return nfsd_nl_get_dump(skb, cb, NFSD_CMD_MAX_BLKSIZE_GET, + NFSD_A_CONTROL_PLANE_MAX_BLKSIZE, + nfsd_max_blksize); +} + +/** + * nfsd_nl_max_conn_set_doit - set the max number of connections + * @skb: reply buffer + * @info: netlink metadata and command arguments + * + * Return 0 on success or a negative errno. + */ +int nfsd_nl_max_conn_set_doit(struct sk_buff *skb, struct genl_info *info) +{ + struct nfsd_net *nn = net_generic(genl_info_net(info), nfsd_net_id); + struct nlattr *attr = info->attrs[NFSD_A_CONTROL_PLANE_MAX_CONN]; + + if (!attr) + return -EINVAL; + + nn->max_connections = nla_get_u32(attr); + + return 0; +} + +/** + * nfsd_nl_max_conn_get_dumpit - dump the max number of connections + * @skb: reply buffer + * @cb: netlink metadata and command arguments + * + * Returns the size of the reply or a negative errno. + */ +int nfsd_nl_max_conn_get_dumpit(struct sk_buff *skb, + struct netlink_callback *cb) +{ + struct nfsd_net *nn = net_generic(sock_net(cb->skb->sk), nfsd_net_id); + + return nfsd_nl_get_dump(skb, cb, NFSD_CMD_MAX_CONN_GET, + NFSD_A_CONTROL_PLANE_MAX_CONN, + nn->max_connections); +} + /** * 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 c8ae72466ee6..145f4811f3d9 100644 --- a/include/uapi/linux/nfsd_netlink.h +++ b/include/uapi/linux/nfsd_netlink.h @@ -29,8 +29,23 @@ enum { NFSD_A_RPC_STATUS_MAX = (__NFSD_A_RPC_STATUS_MAX - 1) }; +enum { + NFSD_A_CONTROL_PLANE_THREADS = 1, + NFSD_A_CONTROL_PLANE_MAX_BLKSIZE, + NFSD_A_CONTROL_PLANE_MAX_CONN, + + __NFSD_A_CONTROL_PLANE_MAX, + NFSD_A_CONTROL_PLANE_MAX = (__NFSD_A_CONTROL_PLANE_MAX - 1) +}; + enum { NFSD_CMD_RPC_STATUS_GET = 1, + NFSD_CMD_THREADS_SET, + NFSD_CMD_THREADS_GET, + NFSD_CMD_MAX_BLKSIZE_SET, + NFSD_CMD_MAX_BLKSIZE_GET, + NFSD_CMD_MAX_CONN_SET, + NFSD_CMD_MAX_CONN_GET, __NFSD_CMD_MAX, NFSD_CMD_MAX = (__NFSD_CMD_MAX - 1) -- 2.41.0
