/* * linux/net/sunrpc/sysctl.c * * Sysctl interface to sunrpc module. * * I would prefer to register the sunrpc table below sys/net, but that's * impossible at the moment. */ #include <linux/types.h> #include <linux/linkage.h> #include <linux/ctype.h> #include <linux/fs.h> #include <linux/sysctl.h> #include <linux/module.h> #include <linux/uaccess.h> #include <linux/sunrpc/types.h> #include <linux/sunrpc/sched.h> #include <linux/sunrpc/stats.h> #include <linux/sunrpc/svc_xprt.h> #include "netns.h" /* * Declare the debug flags here */ unsigned int rpc_debug; EXPORT_SYMBOL_GPL(rpc_debug); unsigned int nfs_debug; EXPORT_SYMBOL_GPL(nfs_debug); unsigned int nfsd_debug; EXPORT_SYMBOL_GPL(nfsd_debug); unsigned int nlm_debug; EXPORT_SYMBOL_GPL(nlm_debug); #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) static struct ctl_table_header *sunrpc_table_header; static struct ctl_table sunrpc_table[]; void rpc_register_sysctl(void) { if (!sunrpc_table_header) sunrpc_table_header = register_sysctl_table(sunrpc_table); } void rpc_unregister_sysctl(void) { if (sunrpc_table_header) { unregister_sysctl_table(sunrpc_table_header); sunrpc_table_header = NULL; } } static int proc_do_xprt(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { char tmpbuf[256]; size_t len; if ((*ppos && !write) || !*lenp) { *lenp = 0; return 0; } len = svc_print_xprts(tmpbuf, sizeof(tmpbuf)); return simple_read_from_buffer(buffer, *lenp, ppos, tmpbuf, len); } static int proc_dodebug(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { char tmpbuf[20], c, *s = NULL; char __user *p; unsigned int value; size_t left, len; if ((*ppos && !write) || !*lenp) { *lenp = 0; return 0; } left = *lenp; if (write) { if (!access_ok(VERIFY_READ, buffer, left)) return -EFAULT; p = buffer; while (left && __get_user(c, p) >= 0 && isspace(c)) left--, p++; if (!left) goto done; if (left > sizeof(tmpbuf) - 1) return -EINVAL; if (copy_from_user(tmpbuf, p, left)) return -EFAULT; tmpbuf[left] = '\0'; value = simple_strtol(tmpbuf, &s, 0); if (s) { left -= (s - tmpbuf); if (left && !isspace(*s)) return -EINVAL; while (left && isspace(*s)) left--, s++; } else left = 0; *(unsigned int *) table->data = value; /* Display the RPC tasks on writing to rpc_debug */ if (strcmp(table->procname, "rpc_debug") == 0) rpc_show_tasks(&init_net); } else { len = sprintf(tmpbuf, "0x%04x", *(unsigned int *) table->data); if (len > left) len = left; if (copy_to_user(buffer, tmpbuf, len)) return -EFAULT; if ((left -= len) > 0) { if (put_user('\n', (char __user *)buffer + len)) return -EFAULT; left--; } } done: *lenp -= left; *ppos += *lenp; return 0; } static struct ctl_table debug_table[] = { { .procname = "rpc_debug", .data = &rpc_debug, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dodebug }, { .procname = "nfs_debug", .data = &nfs_debug, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dodebug }, { .procname = "nfsd_debug", .data = &nfsd_debug, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dodebug }, { .procname = "nlm_debug", .data = &nlm_debug, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dodebug }, { .procname = "transports", .maxlen = 256, .mode = 0444, .proc_handler = proc_do_xprt, }, { } }; static struct ctl_table sunrpc_table[] = { { .procname = "sunrpc", .mode = 0555, .child = debug_table }, { } }; #endif