mq_sysctl.c

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    1 /*
    2  *  Copyright (C) 2007 IBM Corporation
    3  *
    4  *  Author: Cedric Le Goater <clg@fr.ibm.com>
    5  *
    6  *  This program is free software; you can redistribute it and/or
    7  *  modify it under the terms of the GNU General Public License as
    8  *  published by the Free Software Foundation, version 2 of the
    9  *  License.
   10  */
   11 
   12 #include <linux/nsproxy.h>
   13 #include <linux/ipc_namespace.h>
   14 #include <linux/sysctl.h>
   15 
   16 #ifdef CONFIG_PROC_SYSCTL
   17 static void *get_mq(ctl_table *table)
   18 {
   19         char *which = table->data;
   20         struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
   21         which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
   22         return which;
   23 }
   24 
   25 static int proc_mq_dointvec_minmax(ctl_table *table, int write,
   26         void __user *buffer, size_t *lenp, loff_t *ppos)
   27 {
   28         struct ctl_table mq_table;
   29         memcpy(&mq_table, table, sizeof(mq_table));
   30         mq_table.data = get_mq(table);
   31 
   32         return proc_dointvec_minmax(&mq_table, write, buffer,
   33                                         lenp, ppos);
   34 }
   35 #else
   36 #define proc_mq_dointvec_minmax NULL
   37 #endif
   38 
   39 static int msg_queues_limit_min = MIN_QUEUESMAX;
   40 static int msg_queues_limit_max = HARD_QUEUESMAX;
   41 
   42 static int msg_max_limit_min = MIN_MSGMAX;
   43 static int msg_max_limit_max = HARD_MSGMAX;
   44 
   45 static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
   46 static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
   47 
   48 static ctl_table mq_sysctls[] = {
   49         {
   50                 .procname       = "queues_max",
   51                 .data           = &init_ipc_ns.mq_queues_max,
   52                 .maxlen         = sizeof(int),
   53                 .mode           = 0644,
   54                 .proc_handler   = proc_mq_dointvec_minmax,
   55                 .extra1         = &msg_queues_limit_min,
   56                 .extra2         = &msg_queues_limit_max,
   57         },
   58         {
   59                 .procname       = "msg_max",
   60                 .data           = &init_ipc_ns.mq_msg_max,
   61                 .maxlen         = sizeof(int),
   62                 .mode           = 0644,
   63                 .proc_handler   = proc_mq_dointvec_minmax,
   64                 .extra1         = &msg_max_limit_min,
   65                 .extra2         = &msg_max_limit_max,
   66         },
   67         {
   68                 .procname       = "msgsize_max",
   69                 .data           = &init_ipc_ns.mq_msgsize_max,
   70                 .maxlen         = sizeof(int),
   71                 .mode           = 0644,
   72                 .proc_handler   = proc_mq_dointvec_minmax,
   73                 .extra1         = &msg_maxsize_limit_min,
   74                 .extra2         = &msg_maxsize_limit_max,
   75         },
   76         {
   77                 .procname       = "msg_default",
   78                 .data           = &init_ipc_ns.mq_msg_default,
   79                 .maxlen         = sizeof(int),
   80                 .mode           = 0644,
   81                 .proc_handler   = proc_mq_dointvec_minmax,
   82                 .extra1         = &msg_max_limit_min,
   83                 .extra2         = &msg_max_limit_max,
   84         },
   85         {
   86                 .procname       = "msgsize_default",
   87                 .data           = &init_ipc_ns.mq_msgsize_default,
   88                 .maxlen         = sizeof(int),
   89                 .mode           = 0644,
   90                 .proc_handler   = proc_mq_dointvec_minmax,
   91                 .extra1         = &msg_maxsize_limit_min,
   92                 .extra2         = &msg_maxsize_limit_max,
   93         },
   94         {}
   95 };
   96 
   97 static ctl_table mq_sysctl_dir[] = {
   98         {
   99                 .procname       = "mqueue",
  100                 .mode           = 0555,
  101                 .child          = mq_sysctls,
  102         },
  103         {}
  104 };
  105 
  106 static ctl_table mq_sysctl_root[] = {
  107         {
  108                 .procname       = "fs",
  109                 .mode           = 0555,
  110                 .child          = mq_sysctl_dir,
  111         },
  112         {}
  113 };
  114 
  115 struct ctl_table_header *mq_register_sysctl_table(void)
  116 {
  117         return register_sysctl_table(mq_sysctl_root);
  118 }

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FreeBSD/Linux Kernel Cross Reference sys/ipc/mq_sysctl.c

FreeBSD/Linux Kernel Cross Reference
sys/ipc/mq_sysctl.c