This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / kernel / vserver / sysctl.c

diff --git a/kernel/vserver/sysctl.c b/kernel/vserver/sysctl.c
new file mode 100644 (file)
index 0000000..562fc0e
--- /dev/null
+++ b/kernel/vserver/sysctl.c
@@ -0,0 +1,150 @@
+/*
+ *  linux/kernel/sysctl.c
+ *
+ *  Virtual Context Support
+ *
+ *  Copyright (C) 2004  Herbert Pötzl
+ *
+ *  V0.01  basic structure
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/vserver.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/sysctl.h>
+#include <linux/fs.h>
+
+#include <asm/uaccess.h>
+#include <asm/unistd.h>
+
+
+#define CTL_VSERVER    4242    /* unused? */
+
+enum {
+        CTL_DEBUG_SWITCH = 1,
+        CTL_DEBUG_LIMIT,
+};
+
+
+unsigned int vx_debug_switch = 0;
+unsigned int vx_debug_limit = 0;
+
+
+static struct ctl_table_header *vserver_table_header;
+static ctl_table vserver_table[];
+
+
+void vserver_register_sysctl(void)
+{
+       if (!vserver_table_header) {
+               vserver_table_header = register_sysctl_table(vserver_table, 1);
+#ifdef CONFIG_PROC_FS
+//             if (vserver_table[0].de)
+//                     vserver_table[0].de->owner = THIS_MODULE;
+#endif
+       }
+                       
+}
+
+void vserver_unregister_sysctl(void)
+{
+       if (vserver_table_header) {
+               unregister_sysctl_table(vserver_table_header);
+               vserver_table_header = NULL;
+       }
+}
+
+
+static int proc_dodebug(ctl_table *table, int write,
+       struct file *file, void *buffer, size_t *lenp)
+{
+       char            tmpbuf[20], *p, c;
+       unsigned int    value;
+       size_t          left, len;
+
+       if ((file->f_pos && !write) || !*lenp) {
+               *lenp = 0;
+               return 0;
+       }
+
+       left = *lenp;
+
+       if (write) {
+               if (!access_ok(VERIFY_READ, buffer, left))
+                       return -EFAULT;
+               p = (char *) 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';
+
+               for (p = tmpbuf, value = 0; '0' <= *p && *p <= '9'; p++, left--)
+                       value = 10 * value + (*p - '0');
+               if (*p && !isspace(*p))
+                       return -EINVAL;
+               while (left && isspace(*p))
+                       left--, p++;
+               *(unsigned int *) table->data = value;
+       } else {
+               if (!access_ok(VERIFY_WRITE, buffer, left))
+                       return -EFAULT;
+               len = sprintf(tmpbuf, "%d", *(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 *)buffer + len))
+                               return -EFAULT;
+                       left--;
+               }
+       }
+
+done:
+       *lenp -= left;
+       file->f_pos += *lenp;
+       return 0;
+}
+       
+
+
+static ctl_table debug_table[] = {
+        {
+                .ctl_name       = CTL_DEBUG_SWITCH,
+                .procname       = "debug_switch",
+                .data           = &vx_debug_switch,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dodebug
+        },
+        {
+                .ctl_name       = CTL_DEBUG_LIMIT,
+                .procname       = "debug_limit",
+                .data           = &vx_debug_limit,
+                .maxlen         = sizeof(int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dodebug
+        },
+        { .ctl_name = 0 }
+};
+
+static ctl_table vserver_table[] = {
+        {
+                .ctl_name       = CTL_VSERVER,
+                .procname       = "vserver",
+                .mode           = 0555,
+                .child          = debug_table
+        },
+        { .ctl_name = 0 }
+};
+