mirror of https://gitee.com/openkylin/linux.git
143 lines
4.0 KiB
C
143 lines
4.0 KiB
C
/* SCTP kernel implementation
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* (C) Copyright IBM Corp. 2001, 2004
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*
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* This file is part of the SCTP kernel implementation
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*
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* Support for memory object debugging. This allows one to monitor the
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* object allocations/deallocations for types instrumented for this
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* via the proc fs.
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* Jon Grimm <jgrimm@us.ibm.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <net/sctp/sctp.h>
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/*
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* Global counters to count raw object allocation counts.
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* To add new counters, choose a unique suffix for the variable
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* name as the helper macros key off this suffix to make
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* life easier for the programmer.
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*/
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SCTP_DBG_OBJCNT(sock);
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SCTP_DBG_OBJCNT(ep);
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SCTP_DBG_OBJCNT(transport);
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SCTP_DBG_OBJCNT(assoc);
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SCTP_DBG_OBJCNT(bind_addr);
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SCTP_DBG_OBJCNT(bind_bucket);
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SCTP_DBG_OBJCNT(chunk);
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SCTP_DBG_OBJCNT(addr);
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SCTP_DBG_OBJCNT(ssnmap);
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SCTP_DBG_OBJCNT(datamsg);
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SCTP_DBG_OBJCNT(keys);
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/* An array to make it easy to pretty print the debug information
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* to the proc fs.
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*/
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static sctp_dbg_objcnt_entry_t sctp_dbg_objcnt[] = {
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SCTP_DBG_OBJCNT_ENTRY(sock),
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SCTP_DBG_OBJCNT_ENTRY(ep),
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SCTP_DBG_OBJCNT_ENTRY(assoc),
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SCTP_DBG_OBJCNT_ENTRY(transport),
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SCTP_DBG_OBJCNT_ENTRY(chunk),
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SCTP_DBG_OBJCNT_ENTRY(bind_addr),
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SCTP_DBG_OBJCNT_ENTRY(bind_bucket),
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SCTP_DBG_OBJCNT_ENTRY(addr),
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SCTP_DBG_OBJCNT_ENTRY(ssnmap),
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SCTP_DBG_OBJCNT_ENTRY(datamsg),
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SCTP_DBG_OBJCNT_ENTRY(keys),
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};
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/* Callback from procfs to read out objcount information.
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* Walk through the entries in the sctp_dbg_objcnt array, dumping
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* the raw object counts for each monitored type.
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*/
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static int sctp_objcnt_seq_show(struct seq_file *seq, void *v)
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{
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int i, len;
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i = (int)*(loff_t *)v;
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seq_printf(seq, "%s: %d%n", sctp_dbg_objcnt[i].label,
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atomic_read(sctp_dbg_objcnt[i].counter), &len);
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seq_printf(seq, "%*s\n", 127 - len, "");
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return 0;
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}
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static void *sctp_objcnt_seq_start(struct seq_file *seq, loff_t *pos)
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{
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return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
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}
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static void sctp_objcnt_seq_stop(struct seq_file *seq, void *v)
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{
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}
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static void * sctp_objcnt_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return (*pos >= ARRAY_SIZE(sctp_dbg_objcnt)) ? NULL : (void *)pos;
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}
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static const struct seq_operations sctp_objcnt_seq_ops = {
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.start = sctp_objcnt_seq_start,
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.next = sctp_objcnt_seq_next,
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.stop = sctp_objcnt_seq_stop,
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.show = sctp_objcnt_seq_show,
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};
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static int sctp_objcnt_seq_open(struct inode *inode, struct file *file)
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{
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return seq_open(file, &sctp_objcnt_seq_ops);
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}
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static const struct file_operations sctp_objcnt_ops = {
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.open = sctp_objcnt_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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/* Initialize the objcount in the proc filesystem. */
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void sctp_dbg_objcnt_init(struct net *net)
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{
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struct proc_dir_entry *ent;
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ent = proc_create("sctp_dbg_objcnt", 0,
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net->sctp.proc_net_sctp, &sctp_objcnt_ops);
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if (!ent)
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pr_warn("sctp_dbg_objcnt: Unable to create /proc entry.\n");
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}
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/* Cleanup the objcount entry in the proc filesystem. */
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void sctp_dbg_objcnt_exit(struct net *net)
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{
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remove_proc_entry("sctp_dbg_objcnt", net->sctp.proc_net_sctp);
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}
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