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![Thomas Weißschuh](/assets/img/avatar_default.png)
Since commit ee6d3dd4ed
("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.
Take advantage of this to constify the structure definitions to prevent
modification at runtime.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
626 lines
16 KiB
C
626 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2020 Anna Schumaker <Anna.Schumaker@Netapp.com>
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*/
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#include <linux/sunrpc/clnt.h>
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#include <linux/kobject.h>
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#include <linux/sunrpc/addr.h>
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#include <linux/sunrpc/xprtsock.h>
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#include "sysfs.h"
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struct xprt_addr {
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const char *addr;
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struct rcu_head rcu;
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};
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static void free_xprt_addr(struct rcu_head *head)
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{
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struct xprt_addr *addr = container_of(head, struct xprt_addr, rcu);
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kfree(addr->addr);
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kfree(addr);
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}
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static struct kset *rpc_sunrpc_kset;
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static struct kobject *rpc_sunrpc_client_kobj, *rpc_sunrpc_xprt_switch_kobj;
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static void rpc_sysfs_object_release(struct kobject *kobj)
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{
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kfree(kobj);
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}
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static const struct kobj_ns_type_operations *
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rpc_sysfs_object_child_ns_type(const struct kobject *kobj)
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{
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return &net_ns_type_operations;
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}
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static const struct kobj_type rpc_sysfs_object_type = {
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.release = rpc_sysfs_object_release,
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.sysfs_ops = &kobj_sysfs_ops,
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.child_ns_type = rpc_sysfs_object_child_ns_type,
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};
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static struct kobject *rpc_sysfs_object_alloc(const char *name,
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struct kset *kset,
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struct kobject *parent)
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{
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struct kobject *kobj;
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kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
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if (kobj) {
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kobj->kset = kset;
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if (kobject_init_and_add(kobj, &rpc_sysfs_object_type,
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parent, "%s", name) == 0)
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return kobj;
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kobject_put(kobj);
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}
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return NULL;
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}
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static inline struct rpc_xprt *
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rpc_sysfs_xprt_kobj_get_xprt(struct kobject *kobj)
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{
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struct rpc_sysfs_xprt *x = container_of(kobj,
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struct rpc_sysfs_xprt, kobject);
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return xprt_get(x->xprt);
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}
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static inline struct rpc_xprt_switch *
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rpc_sysfs_xprt_kobj_get_xprt_switch(struct kobject *kobj)
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{
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struct rpc_sysfs_xprt *x = container_of(kobj,
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struct rpc_sysfs_xprt, kobject);
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return xprt_switch_get(x->xprt_switch);
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}
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static inline struct rpc_xprt_switch *
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rpc_sysfs_xprt_switch_kobj_get_xprt(struct kobject *kobj)
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{
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struct rpc_sysfs_xprt_switch *x = container_of(kobj,
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struct rpc_sysfs_xprt_switch, kobject);
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return xprt_switch_get(x->xprt_switch);
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}
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static ssize_t rpc_sysfs_xprt_dstaddr_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf)
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{
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struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
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ssize_t ret;
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if (!xprt) {
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ret = sprintf(buf, "<closed>\n");
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goto out;
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}
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ret = sprintf(buf, "%s\n", xprt->address_strings[RPC_DISPLAY_ADDR]);
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xprt_put(xprt);
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out:
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return ret;
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}
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static ssize_t rpc_sysfs_xprt_srcaddr_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf)
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{
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struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
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size_t buflen = PAGE_SIZE;
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ssize_t ret;
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if (!xprt || !xprt_connected(xprt)) {
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ret = sprintf(buf, "<closed>\n");
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} else if (xprt->ops->get_srcaddr) {
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ret = xprt->ops->get_srcaddr(xprt, buf, buflen);
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if (ret > 0) {
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if (ret < buflen - 1) {
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buf[ret] = '\n';
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ret++;
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buf[ret] = '\0';
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}
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} else
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ret = sprintf(buf, "<closed>\n");
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} else
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ret = sprintf(buf, "<not a socket>\n");
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xprt_put(xprt);
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return ret;
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}
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static ssize_t rpc_sysfs_xprt_info_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *buf)
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{
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struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
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unsigned short srcport = 0;
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size_t buflen = PAGE_SIZE;
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ssize_t ret;
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if (!xprt || !xprt_connected(xprt)) {
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ret = sprintf(buf, "<closed>\n");
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goto out;
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}
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if (xprt->ops->get_srcport)
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srcport = xprt->ops->get_srcport(xprt);
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ret = snprintf(buf, buflen,
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"last_used=%lu\ncur_cong=%lu\ncong_win=%lu\n"
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"max_num_slots=%u\nmin_num_slots=%u\nnum_reqs=%u\n"
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"binding_q_len=%u\nsending_q_len=%u\npending_q_len=%u\n"
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"backlog_q_len=%u\nmain_xprt=%d\nsrc_port=%u\n"
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"tasks_queuelen=%ld\ndst_port=%s\n",
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xprt->last_used, xprt->cong, xprt->cwnd, xprt->max_reqs,
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xprt->min_reqs, xprt->num_reqs, xprt->binding.qlen,
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xprt->sending.qlen, xprt->pending.qlen,
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xprt->backlog.qlen, xprt->main, srcport,
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atomic_long_read(&xprt->queuelen),
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xprt->address_strings[RPC_DISPLAY_PORT]);
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out:
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xprt_put(xprt);
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return ret;
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}
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static ssize_t rpc_sysfs_xprt_state_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf)
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{
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struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
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ssize_t ret;
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int locked, connected, connecting, close_wait, bound, binding,
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closing, congested, cwnd_wait, write_space, offline, remove;
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if (!(xprt && xprt->state)) {
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ret = sprintf(buf, "state=CLOSED\n");
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} else {
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locked = test_bit(XPRT_LOCKED, &xprt->state);
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connected = test_bit(XPRT_CONNECTED, &xprt->state);
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connecting = test_bit(XPRT_CONNECTING, &xprt->state);
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close_wait = test_bit(XPRT_CLOSE_WAIT, &xprt->state);
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bound = test_bit(XPRT_BOUND, &xprt->state);
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binding = test_bit(XPRT_BINDING, &xprt->state);
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closing = test_bit(XPRT_CLOSING, &xprt->state);
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congested = test_bit(XPRT_CONGESTED, &xprt->state);
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cwnd_wait = test_bit(XPRT_CWND_WAIT, &xprt->state);
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write_space = test_bit(XPRT_WRITE_SPACE, &xprt->state);
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offline = test_bit(XPRT_OFFLINE, &xprt->state);
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remove = test_bit(XPRT_REMOVE, &xprt->state);
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ret = sprintf(buf, "state=%s %s %s %s %s %s %s %s %s %s %s %s\n",
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locked ? "LOCKED" : "",
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connected ? "CONNECTED" : "",
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connecting ? "CONNECTING" : "",
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close_wait ? "CLOSE_WAIT" : "",
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bound ? "BOUND" : "",
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binding ? "BOUNDING" : "",
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closing ? "CLOSING" : "",
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congested ? "CONGESTED" : "",
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cwnd_wait ? "CWND_WAIT" : "",
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write_space ? "WRITE_SPACE" : "",
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offline ? "OFFLINE" : "",
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remove ? "REMOVE" : "");
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}
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xprt_put(xprt);
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return ret;
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}
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static ssize_t rpc_sysfs_xprt_switch_info_show(struct kobject *kobj,
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struct kobj_attribute *attr,
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char *buf)
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{
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struct rpc_xprt_switch *xprt_switch =
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rpc_sysfs_xprt_switch_kobj_get_xprt(kobj);
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ssize_t ret;
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if (!xprt_switch)
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return 0;
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ret = sprintf(buf, "num_xprts=%u\nnum_active=%u\n"
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"num_unique_destaddr=%u\nqueue_len=%ld\n",
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xprt_switch->xps_nxprts, xprt_switch->xps_nactive,
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xprt_switch->xps_nunique_destaddr_xprts,
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atomic_long_read(&xprt_switch->xps_queuelen));
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xprt_switch_put(xprt_switch);
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return ret;
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}
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static ssize_t rpc_sysfs_xprt_dstaddr_store(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t count)
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{
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struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
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struct sockaddr *saddr;
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char *dst_addr;
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int port;
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struct xprt_addr *saved_addr;
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size_t buf_len;
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if (!xprt)
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return 0;
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if (!(xprt->xprt_class->ident == XPRT_TRANSPORT_TCP ||
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xprt->xprt_class->ident == XPRT_TRANSPORT_RDMA)) {
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xprt_put(xprt);
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return -EOPNOTSUPP;
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}
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if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) {
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count = -EINTR;
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goto out_put;
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}
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saddr = (struct sockaddr *)&xprt->addr;
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port = rpc_get_port(saddr);
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/* buf_len is the len until the first occurence of either
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* '\n' or '\0'
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*/
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buf_len = strcspn(buf, "\n");
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dst_addr = kstrndup(buf, buf_len, GFP_KERNEL);
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if (!dst_addr)
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goto out_err;
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saved_addr = kzalloc(sizeof(*saved_addr), GFP_KERNEL);
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if (!saved_addr)
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goto out_err_free;
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saved_addr->addr =
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rcu_dereference_raw(xprt->address_strings[RPC_DISPLAY_ADDR]);
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rcu_assign_pointer(xprt->address_strings[RPC_DISPLAY_ADDR], dst_addr);
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call_rcu(&saved_addr->rcu, free_xprt_addr);
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xprt->addrlen = rpc_pton(xprt->xprt_net, buf, buf_len, saddr,
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sizeof(*saddr));
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rpc_set_port(saddr, port);
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xprt_force_disconnect(xprt);
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out:
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xprt_release_write(xprt, NULL);
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out_put:
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xprt_put(xprt);
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return count;
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out_err_free:
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kfree(dst_addr);
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out_err:
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count = -ENOMEM;
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goto out;
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}
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static ssize_t rpc_sysfs_xprt_state_change(struct kobject *kobj,
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struct kobj_attribute *attr,
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const char *buf, size_t count)
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{
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struct rpc_xprt *xprt = rpc_sysfs_xprt_kobj_get_xprt(kobj);
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int offline = 0, online = 0, remove = 0;
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struct rpc_xprt_switch *xps = rpc_sysfs_xprt_kobj_get_xprt_switch(kobj);
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if (!xprt || !xps) {
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count = 0;
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goto out_put;
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}
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if (!strncmp(buf, "offline", 7))
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offline = 1;
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else if (!strncmp(buf, "online", 6))
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online = 1;
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else if (!strncmp(buf, "remove", 6))
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remove = 1;
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else {
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count = -EINVAL;
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goto out_put;
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}
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if (wait_on_bit_lock(&xprt->state, XPRT_LOCKED, TASK_KILLABLE)) {
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count = -EINTR;
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goto out_put;
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}
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if (xprt->main) {
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count = -EINVAL;
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goto release_tasks;
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}
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if (offline) {
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xprt_set_offline_locked(xprt, xps);
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} else if (online) {
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xprt_set_online_locked(xprt, xps);
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} else if (remove) {
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if (test_bit(XPRT_OFFLINE, &xprt->state))
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xprt_delete_locked(xprt, xps);
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else
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count = -EINVAL;
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}
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release_tasks:
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xprt_release_write(xprt, NULL);
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out_put:
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xprt_put(xprt);
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xprt_switch_put(xps);
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return count;
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}
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int rpc_sysfs_init(void)
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{
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rpc_sunrpc_kset = kset_create_and_add("sunrpc", NULL, kernel_kobj);
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if (!rpc_sunrpc_kset)
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return -ENOMEM;
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rpc_sunrpc_client_kobj =
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rpc_sysfs_object_alloc("rpc-clients", rpc_sunrpc_kset, NULL);
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if (!rpc_sunrpc_client_kobj)
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goto err_client;
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rpc_sunrpc_xprt_switch_kobj =
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rpc_sysfs_object_alloc("xprt-switches", rpc_sunrpc_kset, NULL);
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if (!rpc_sunrpc_xprt_switch_kobj)
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goto err_switch;
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return 0;
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err_switch:
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kobject_put(rpc_sunrpc_client_kobj);
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rpc_sunrpc_client_kobj = NULL;
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err_client:
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kset_unregister(rpc_sunrpc_kset);
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rpc_sunrpc_kset = NULL;
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return -ENOMEM;
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}
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static void rpc_sysfs_client_release(struct kobject *kobj)
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{
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struct rpc_sysfs_client *c;
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c = container_of(kobj, struct rpc_sysfs_client, kobject);
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kfree(c);
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}
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static void rpc_sysfs_xprt_switch_release(struct kobject *kobj)
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{
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struct rpc_sysfs_xprt_switch *xprt_switch;
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xprt_switch = container_of(kobj, struct rpc_sysfs_xprt_switch, kobject);
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kfree(xprt_switch);
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}
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static void rpc_sysfs_xprt_release(struct kobject *kobj)
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{
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struct rpc_sysfs_xprt *xprt;
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xprt = container_of(kobj, struct rpc_sysfs_xprt, kobject);
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kfree(xprt);
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}
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static const void *rpc_sysfs_client_namespace(const struct kobject *kobj)
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{
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return container_of(kobj, struct rpc_sysfs_client, kobject)->net;
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}
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static const void *rpc_sysfs_xprt_switch_namespace(const struct kobject *kobj)
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{
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return container_of(kobj, struct rpc_sysfs_xprt_switch, kobject)->net;
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}
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static const void *rpc_sysfs_xprt_namespace(const struct kobject *kobj)
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{
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return container_of(kobj, struct rpc_sysfs_xprt,
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kobject)->xprt->xprt_net;
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}
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static struct kobj_attribute rpc_sysfs_xprt_dstaddr = __ATTR(dstaddr,
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0644, rpc_sysfs_xprt_dstaddr_show, rpc_sysfs_xprt_dstaddr_store);
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static struct kobj_attribute rpc_sysfs_xprt_srcaddr = __ATTR(srcaddr,
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0644, rpc_sysfs_xprt_srcaddr_show, NULL);
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static struct kobj_attribute rpc_sysfs_xprt_info = __ATTR(xprt_info,
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0444, rpc_sysfs_xprt_info_show, NULL);
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static struct kobj_attribute rpc_sysfs_xprt_change_state = __ATTR(xprt_state,
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0644, rpc_sysfs_xprt_state_show, rpc_sysfs_xprt_state_change);
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static struct attribute *rpc_sysfs_xprt_attrs[] = {
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&rpc_sysfs_xprt_dstaddr.attr,
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&rpc_sysfs_xprt_srcaddr.attr,
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&rpc_sysfs_xprt_info.attr,
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&rpc_sysfs_xprt_change_state.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(rpc_sysfs_xprt);
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static struct kobj_attribute rpc_sysfs_xprt_switch_info =
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__ATTR(xprt_switch_info, 0444, rpc_sysfs_xprt_switch_info_show, NULL);
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static struct attribute *rpc_sysfs_xprt_switch_attrs[] = {
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&rpc_sysfs_xprt_switch_info.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(rpc_sysfs_xprt_switch);
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static const struct kobj_type rpc_sysfs_client_type = {
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.release = rpc_sysfs_client_release,
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.sysfs_ops = &kobj_sysfs_ops,
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.namespace = rpc_sysfs_client_namespace,
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};
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static const struct kobj_type rpc_sysfs_xprt_switch_type = {
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.release = rpc_sysfs_xprt_switch_release,
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.default_groups = rpc_sysfs_xprt_switch_groups,
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.sysfs_ops = &kobj_sysfs_ops,
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.namespace = rpc_sysfs_xprt_switch_namespace,
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};
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static const struct kobj_type rpc_sysfs_xprt_type = {
|
|
.release = rpc_sysfs_xprt_release,
|
|
.default_groups = rpc_sysfs_xprt_groups,
|
|
.sysfs_ops = &kobj_sysfs_ops,
|
|
.namespace = rpc_sysfs_xprt_namespace,
|
|
};
|
|
|
|
void rpc_sysfs_exit(void)
|
|
{
|
|
kobject_put(rpc_sunrpc_client_kobj);
|
|
kobject_put(rpc_sunrpc_xprt_switch_kobj);
|
|
kset_unregister(rpc_sunrpc_kset);
|
|
}
|
|
|
|
static struct rpc_sysfs_client *rpc_sysfs_client_alloc(struct kobject *parent,
|
|
struct net *net,
|
|
int clid)
|
|
{
|
|
struct rpc_sysfs_client *p;
|
|
|
|
p = kzalloc(sizeof(*p), GFP_KERNEL);
|
|
if (p) {
|
|
p->net = net;
|
|
p->kobject.kset = rpc_sunrpc_kset;
|
|
if (kobject_init_and_add(&p->kobject, &rpc_sysfs_client_type,
|
|
parent, "clnt-%d", clid) == 0)
|
|
return p;
|
|
kobject_put(&p->kobject);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct rpc_sysfs_xprt_switch *
|
|
rpc_sysfs_xprt_switch_alloc(struct kobject *parent,
|
|
struct rpc_xprt_switch *xprt_switch,
|
|
struct net *net,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct rpc_sysfs_xprt_switch *p;
|
|
|
|
p = kzalloc(sizeof(*p), gfp_flags);
|
|
if (p) {
|
|
p->net = net;
|
|
p->kobject.kset = rpc_sunrpc_kset;
|
|
if (kobject_init_and_add(&p->kobject,
|
|
&rpc_sysfs_xprt_switch_type,
|
|
parent, "switch-%d",
|
|
xprt_switch->xps_id) == 0)
|
|
return p;
|
|
kobject_put(&p->kobject);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static struct rpc_sysfs_xprt *rpc_sysfs_xprt_alloc(struct kobject *parent,
|
|
struct rpc_xprt *xprt,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct rpc_sysfs_xprt *p;
|
|
|
|
p = kzalloc(sizeof(*p), gfp_flags);
|
|
if (!p)
|
|
goto out;
|
|
p->kobject.kset = rpc_sunrpc_kset;
|
|
if (kobject_init_and_add(&p->kobject, &rpc_sysfs_xprt_type,
|
|
parent, "xprt-%d-%s", xprt->id,
|
|
xprt->address_strings[RPC_DISPLAY_PROTO]) == 0)
|
|
return p;
|
|
kobject_put(&p->kobject);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
void rpc_sysfs_client_setup(struct rpc_clnt *clnt,
|
|
struct rpc_xprt_switch *xprt_switch,
|
|
struct net *net)
|
|
{
|
|
struct rpc_sysfs_client *rpc_client;
|
|
struct rpc_sysfs_xprt_switch *xswitch =
|
|
(struct rpc_sysfs_xprt_switch *)xprt_switch->xps_sysfs;
|
|
|
|
if (!xswitch)
|
|
return;
|
|
|
|
rpc_client = rpc_sysfs_client_alloc(rpc_sunrpc_client_kobj,
|
|
net, clnt->cl_clid);
|
|
if (rpc_client) {
|
|
char name[] = "switch";
|
|
int ret;
|
|
|
|
clnt->cl_sysfs = rpc_client;
|
|
rpc_client->clnt = clnt;
|
|
rpc_client->xprt_switch = xprt_switch;
|
|
kobject_uevent(&rpc_client->kobject, KOBJ_ADD);
|
|
ret = sysfs_create_link_nowarn(&rpc_client->kobject,
|
|
&xswitch->kobject, name);
|
|
if (ret)
|
|
pr_warn("can't create link to %s in sysfs (%d)\n",
|
|
name, ret);
|
|
}
|
|
}
|
|
|
|
void rpc_sysfs_xprt_switch_setup(struct rpc_xprt_switch *xprt_switch,
|
|
struct rpc_xprt *xprt,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct rpc_sysfs_xprt_switch *rpc_xprt_switch;
|
|
struct net *net;
|
|
|
|
if (xprt_switch->xps_net)
|
|
net = xprt_switch->xps_net;
|
|
else
|
|
net = xprt->xprt_net;
|
|
rpc_xprt_switch =
|
|
rpc_sysfs_xprt_switch_alloc(rpc_sunrpc_xprt_switch_kobj,
|
|
xprt_switch, net, gfp_flags);
|
|
if (rpc_xprt_switch) {
|
|
xprt_switch->xps_sysfs = rpc_xprt_switch;
|
|
rpc_xprt_switch->xprt_switch = xprt_switch;
|
|
rpc_xprt_switch->xprt = xprt;
|
|
kobject_uevent(&rpc_xprt_switch->kobject, KOBJ_ADD);
|
|
} else {
|
|
xprt_switch->xps_sysfs = NULL;
|
|
}
|
|
}
|
|
|
|
void rpc_sysfs_xprt_setup(struct rpc_xprt_switch *xprt_switch,
|
|
struct rpc_xprt *xprt,
|
|
gfp_t gfp_flags)
|
|
{
|
|
struct rpc_sysfs_xprt *rpc_xprt;
|
|
struct rpc_sysfs_xprt_switch *switch_obj =
|
|
(struct rpc_sysfs_xprt_switch *)xprt_switch->xps_sysfs;
|
|
|
|
if (!switch_obj)
|
|
return;
|
|
|
|
rpc_xprt = rpc_sysfs_xprt_alloc(&switch_obj->kobject, xprt, gfp_flags);
|
|
if (rpc_xprt) {
|
|
xprt->xprt_sysfs = rpc_xprt;
|
|
rpc_xprt->xprt = xprt;
|
|
rpc_xprt->xprt_switch = xprt_switch;
|
|
kobject_uevent(&rpc_xprt->kobject, KOBJ_ADD);
|
|
}
|
|
}
|
|
|
|
void rpc_sysfs_client_destroy(struct rpc_clnt *clnt)
|
|
{
|
|
struct rpc_sysfs_client *rpc_client = clnt->cl_sysfs;
|
|
|
|
if (rpc_client) {
|
|
char name[] = "switch";
|
|
|
|
sysfs_remove_link(&rpc_client->kobject, name);
|
|
kobject_uevent(&rpc_client->kobject, KOBJ_REMOVE);
|
|
kobject_del(&rpc_client->kobject);
|
|
kobject_put(&rpc_client->kobject);
|
|
clnt->cl_sysfs = NULL;
|
|
}
|
|
}
|
|
|
|
void rpc_sysfs_xprt_switch_destroy(struct rpc_xprt_switch *xprt_switch)
|
|
{
|
|
struct rpc_sysfs_xprt_switch *rpc_xprt_switch = xprt_switch->xps_sysfs;
|
|
|
|
if (rpc_xprt_switch) {
|
|
kobject_uevent(&rpc_xprt_switch->kobject, KOBJ_REMOVE);
|
|
kobject_del(&rpc_xprt_switch->kobject);
|
|
kobject_put(&rpc_xprt_switch->kobject);
|
|
xprt_switch->xps_sysfs = NULL;
|
|
}
|
|
}
|
|
|
|
void rpc_sysfs_xprt_destroy(struct rpc_xprt *xprt)
|
|
{
|
|
struct rpc_sysfs_xprt *rpc_xprt = xprt->xprt_sysfs;
|
|
|
|
if (rpc_xprt) {
|
|
kobject_uevent(&rpc_xprt->kobject, KOBJ_REMOVE);
|
|
kobject_del(&rpc_xprt->kobject);
|
|
kobject_put(&rpc_xprt->kobject);
|
|
xprt->xprt_sysfs = NULL;
|
|
}
|
|
}
|