LXR linux/net/sctp/objcnt.c

   1/* SCTP kernel reference Implementation
   2 * (C) Copyright IBM Corp. 2001, 2004
   3 *
   4 * This file is part of the SCTP kernel reference Implementation
   5 *
   6 * Support for memory object debugging.  This allows one to monitor the
   7 * object allocations/deallocations for types instrumented for this
   8 * via the proc fs.
   9 *
  10 * The SCTP reference implementation is free software;
  11 * you can redistribute it and/or modify it under the terms of
  12 * the GNU General Public License as published by
  13 * the Free Software Foundation; either version 2, or (at your option)
  14 * any later version.
  15 *
  16 * The SCTP reference implementation is distributed in the hope that it
  17 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  18 *                 ************************
  19 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  20 * See the GNU General Public License for more details.
  21 *
  22 * You should have received a copy of the GNU General Public License
  23 * along with GNU CC; see the file COPYING.  If not, write to
  24 * the Free Software Foundation, 59 Temple Place - Suite 330,
  25 * Boston, MA 02111-1307, USA.
  26 *
  27 * Please send any bug reports or fixes you make to the
  28 * email address(es):
  29 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  30 *
  31 * Or submit a bug report through the following website:
  32 *    http://www.sf.net/projects/lksctp
  33 *
  34 * Written or modified by:
  35 *    Jon Grimm             <jgrimm@us.ibm.com>
  36 *
  37 * Any bugs reported given to us we will try to fix... any fixes shared will
  38 * be incorporated into the next SCTP release.
  39 */
  40
  41#include <linux/kernel.h>
  42#include <net/sctp/sctp.h>
  43
  44/*
  45 * Global counters to count raw object allocation counts.
  46 * To add new counters, choose a unique suffix for the variable
  47 * name as the helper macros key off this suffix to make
  48 * life easier for the programmer.
  49 */
  50
  51SCTP_DBG_OBJCNT(sock);
  52SCTP_DBG_OBJCNT(ep);
  53SCTP_DBG_OBJCNT(transport);
  54SCTP_DBG_OBJCNT(assoc);
  55SCTP_DBG_OBJCNT(bind_addr);
  56SCTP_DBG_OBJCNT(bind_bucket);
  57SCTP_DBG_OBJCNT(chunk);
  58SCTP_DBG_OBJCNT(addr);
  59SCTP_DBG_OBJCNT(ssnmap);
  60SCTP_DBG_OBJCNT(datamsg);
  61SCTP_DBG_OBJCNT(keys);
  62
  63/* An array to make it easy to pretty print the debug information
  64 * to the proc fs.
  65 */
  66static sctp_dbg_objcnt_entry_t sctp_dbg_objcnt[] = {
  67        SCTP_DBG_OBJCNT_ENTRY(sock),
  68        SCTP_DBG_OBJCNT_ENTRY(ep),
  69        SCTP_DBG_OBJCNT_ENTRY(assoc),
  70        SCTP_DBG_OBJCNT_ENTRY(transport),
  71        SCTP_DBG_OBJCNT_ENTRY(chunk),
  72        SCTP_DBG_OBJCNT_ENTRY(bind_addr),
  73        SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
  74        SCTP_DBG_OBJCNT_ENTRY(addr),
  75        SCTP_DBG_OBJCNT_ENTRY(ssnmap),
  76        SCTP_DBG_OBJCNT_ENTRY(datamsg),
  77        SCTP_DBG_OBJCNT_ENTRY(keys),
  78};
  79
  80/* Callback from procfs to read out objcount information.
  81 * Walk through the entries in the sctp_dbg_objcnt array, dumping
  82 * the raw object counts for each monitored type.
  83 *
  84 * This code was modified from similar code in route.c
  85 */
  86static int sctp_dbg_objcnt_read(char *buffer, char **start, off_t offset,
  87                                int length, int *eof, void *data)
  88{
  89        int len = 0;
  90        off_t pos = 0;
  91        int entries;
  92        int i;
  93        char temp[128];
  94
  95        /* How many entries? */
  96        entries = ARRAY_SIZE(sctp_dbg_objcnt);
  97
  98        /* Walk the entries and print out the debug information
  99         * for proc fs.
 100         */
 101        for (i = 0; i < entries; i++) {
 102                pos += 128;
 103
 104                /* Skip ahead. */
 105                if (pos <= offset) {
 106                        len = 0;
 107                        continue;
 108                }
 109                /* Print out each entry. */
 110                sprintf(temp, "%s: %d",
 111                        sctp_dbg_objcnt[i].label,
 112                        atomic_read(sctp_dbg_objcnt[i].counter));
 113
 114                sprintf(buffer + len, "%-127s\n", temp);
 115                len += 128;
 116                if (pos >= offset+length)
 117                        goto done;
 118        }
 119
 120done:
 121        *start = buffer + len - (pos - offset);
 122        len = pos - offset;
 123        if (len > length)
 124                len = length;
 125
 126        return len;
 127}
 128
 129/* Initialize the objcount in the proc filesystem.  */
 130void sctp_dbg_objcnt_init(void)
 131{
 132        struct proc_dir_entry *ent;
 133        ent = create_proc_read_entry("sctp_dbg_objcnt", 0, proc_net_sctp,
 134                               sctp_dbg_objcnt_read, NULL);
 135        if (!ent)
 136                printk(KERN_WARNING
 137                        "sctp_dbg_objcnt: Unable to create /proc entry.\n");
 138}
 139
 140/* Cleanup the objcount entry in the proc filesystem.  */
 141void sctp_dbg_objcnt_exit(void)
 142{
 143        remove_proc_entry("sctp_dbg_objcnt", proc_net_sctp);
 144}
 145
 146
 147