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svc: Add /proc/sys/sunrpc/transport files
Add a file that when read lists the set of registered svc transports. Signed-off-by: Tom Tucker <tom@opengridcomputing.com> Acked-by: Neil Brown <neilb@suse.de> Reviewed-by: Chuck Lever <chuck.lever@oracle.com> Reviewed-by: Greg Banks <gnb@sgi.com> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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@ -79,6 +79,7 @@ void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
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void svc_close_xprt(struct svc_xprt *xprt);
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void svc_delete_xprt(struct svc_xprt *xprt);
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int svc_port_is_privileged(struct sockaddr *sin);
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int svc_print_xprts(char *buf, int maxlen);
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static inline void svc_xprt_get(struct svc_xprt *xprt)
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{
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@ -112,6 +112,34 @@ void svc_unreg_xprt_class(struct svc_xprt_class *xcl)
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}
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EXPORT_SYMBOL_GPL(svc_unreg_xprt_class);
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/*
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* Format the transport list for printing
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*/
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int svc_print_xprts(char *buf, int maxlen)
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{
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struct list_head *le;
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char tmpstr[80];
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int len = 0;
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buf[0] = '\0';
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spin_lock(&svc_xprt_class_lock);
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list_for_each(le, &svc_xprt_class_list) {
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int slen;
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struct svc_xprt_class *xcl =
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list_entry(le, struct svc_xprt_class, xcl_list);
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sprintf(tmpstr, "%s %d\n", xcl->xcl_name, xcl->xcl_max_payload);
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slen = strlen(tmpstr);
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if (len + slen > maxlen)
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break;
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len += slen;
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strcat(buf, tmpstr);
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}
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spin_unlock(&svc_xprt_class_lock);
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return len;
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}
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static void svc_xprt_free(struct kref *kref)
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{
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struct svc_xprt *xprt =
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@ -18,6 +18,7 @@
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#include <linux/sunrpc/types.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/stats.h>
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#include <linux/sunrpc/svc_xprt.h>
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/*
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* Declare the debug flags here
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@ -55,6 +56,30 @@ rpc_unregister_sysctl(void)
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}
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}
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static int proc_do_xprt(ctl_table *table, int write, struct file *file,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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char tmpbuf[256];
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int len;
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if ((*ppos && !write) || !*lenp) {
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*lenp = 0;
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return 0;
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}
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if (write)
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return -EINVAL;
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else {
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len = svc_print_xprts(tmpbuf, sizeof(tmpbuf));
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if (!access_ok(VERIFY_WRITE, buffer, len))
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return -EFAULT;
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if (__copy_to_user(buffer, tmpbuf, len))
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return -EFAULT;
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}
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*lenp -= len;
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*ppos += len;
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return 0;
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}
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static int
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proc_dodebug(ctl_table *table, int write, struct file *file,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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@ -147,6 +172,12 @@ static ctl_table debug_table[] = {
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.mode = 0644,
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.proc_handler = &proc_dodebug
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},
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{
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.procname = "transports",
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.maxlen = 256,
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.mode = 0444,
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.proc_handler = &proc_do_xprt,
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},
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{ .ctl_name = 0 }
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};
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