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sunrpc: provide multipath info in the sysfs directory 

Allow to query xrpt_switch attributes. Currently showing the following
fields of the rpc_xprt_switch structure: xps_nxprts, xps_nactive,
xps_queuelen.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Olga Kornievskaia 2021-06-08 15:59:21 -04:00 committed by Trond Myklebust
parent 4a09651a6b
commit 0e55903587
1 changed files with 35 additions and 0 deletions
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35
net/sunrpc/sysfs.c
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@ -67,6 +67,15 @@ rpc_sysfs_xprt_kobj_get_xprt(struct kobject *kobj)
return xprt_get(x->xprt);
}
static inline struct rpc_xprt_switch *
rpc_sysfs_xprt_switch_kobj_get_xprt(struct kobject *kobj)
{
struct rpc_sysfs_xprt_switch *x = container_of(kobj,
struct rpc_sysfs_xprt_switch, kobject);
return xprt_switch_get(x->xprt_switch);
}
static ssize_t rpc_sysfs_xprt_dstaddr_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
@ -102,6 +111,23 @@ static ssize_t rpc_sysfs_xprt_info_show(struct kobject *kobj,
return ret + 1;
}
static ssize_t rpc_sysfs_xprt_switch_info_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
struct rpc_xprt_switch *xprt_switch =
rpc_sysfs_xprt_switch_kobj_get_xprt(kobj);
ssize_t ret;
if (!xprt_switch)
return 0;
ret = sprintf(buf, "num_xprts=%u\nnum_active=%u\nqueue_len=%ld\n",
xprt_switch->xps_nxprts, xprt_switch->xps_nactive,
atomic_long_read(&xprt_switch->xps_queuelen));
xprt_switch_put(xprt_switch);
return ret + 1;
}
static ssize_t rpc_sysfs_xprt_dstaddr_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
@ -235,6 +261,14 @@ static struct attribute *rpc_sysfs_xprt_attrs[] = {
NULL,
};
static struct kobj_attribute rpc_sysfs_xprt_switch_info =
__ATTR(xprt_switch_info, 0444, rpc_sysfs_xprt_switch_info_show, NULL);
static struct attribute *rpc_sysfs_xprt_switch_attrs[] = {
&rpc_sysfs_xprt_switch_info.attr,
NULL,
};
static struct kobj_type rpc_sysfs_client_type = {
.release = rpc_sysfs_client_release,
.sysfs_ops = &kobj_sysfs_ops,
@ -243,6 +277,7 @@ static struct kobj_type rpc_sysfs_client_type = {
static struct kobj_type rpc_sysfs_xprt_switch_type = {
.release = rpc_sysfs_xprt_switch_release,
.default_attrs = rpc_sysfs_xprt_switch_attrs,
.sysfs_ops = &kobj_sysfs_ops,
.namespace = rpc_sysfs_xprt_switch_namespace,
};