linux-kernel - [PATCH 09/19] Create /proc/pid/core entry

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Date:	Fri, 04 Oct 2013 16:01:47 +0530
From:	Janani Venkataraman <jananive@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	amwang@...hat.com, rdunlap@...otime.net, andi@...stfloor.org,
	aravinda@...ux.vnet.ibm.com, hch@....de, mhiramat@...hat.com,
	jeremy.fitzhardinge@...rix.com, xemul@...allels.com,
	suzuki@...ux.vnet.ibm.com, kosaki.motohiro@...fujitsu.com,
	adobriyan@...il.com, tarundsk@...ux.vnet.ibm.com,
	vapier@...too.org, roland@...k.frob.com, tj@...nel.org,
	ananth@...ux.vnet.ibm.com, gorcunov@...nvz.org, avagin@...nvz.org,
	oleg@...hat.com, eparis@...hat.com, d.hatayama@...fujitsu.com,
	james.hogan@...tec.com, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org
Subject: [PATCH 09/19] Create /proc/pid/core entry

From:Ananth N.Mavinakayanahalli <ananth@...ibm.com>

Create the /proc/PID/core entry.

Signed-off-by: Suzuki K. Poulose <suzuki@...ibm.com>
Signed-off-by: Ananth N.Mavinakayanahalli <ananth@...ibm.com>
---
 fs/proc/Makefile   |    1 +
 fs/proc/base.c     |    2 ++
 fs/proc/gencore.c  |   48 ++++++++++++++++++++++++++++++++++++++++++++++++
 fs/proc/internal.h |    1 +
 4 files changed, 52 insertions(+)
 create mode 100644 fs/proc/gencore.c

diff --git a/fs/proc/Makefile b/fs/proc/Makefile
index ab30716..a456c22 100644
--- a/fs/proc/Makefile
+++ b/fs/proc/Makefile
@@ -23,6 +23,7 @@ proc-y	+= version.o
 proc-y	+= softirqs.o
 proc-y	+= namespaces.o
 proc-y	+= self.o
+proc-$(CONFIG_ELF_CORE)        += gencore.o
 proc-$(CONFIG_PROC_SYSCTL)	+= proc_sysctl.o
 proc-$(CONFIG_NET)		+= proc_net.o
 proc-$(CONFIG_PROC_KCORE)	+= kcore.o
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 1485e38..da5a212 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2640,6 +2640,8 @@ static const struct pid_entry tgid_base_stuff[] = {
 #endif
 #ifdef CONFIG_ELF_CORE
 	REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
+	REG("core", S_IRUSR, proc_gen_core_operations),
+
 #endif
 #ifdef CONFIG_TASK_IO_ACCOUNTING
 	INF("io",	S_IRUSR, proc_tgid_io_accounting),
diff --git a/fs/proc/gencore.c b/fs/proc/gencore.c
new file mode 100644
index 0000000..115f1e4
--- /dev/null
+++ b/fs/proc/gencore.c
@@ -0,0 +1,48 @@
+/*
+ * Application core dump
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) IBM Corporation, 2010, 2013
+ *
+ * Authors:
+ *      Ananth N.Mavinakayanahalli <ananth@...ibm.com>
+ *      Suzuki K. Poulose <suzuki@...ibm.com>
+ */
+
+#include <linux/seq_file.h>
+#include "internal.h"
+
+static ssize_t read_gencore(struct file *file, char __user *buffer,
+				size_t buflen, loff_t *fpos)
+{
+	return 0;
+}
+
+static int release_gencore(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static int open_gencore(struct inode *inode, struct file *filp)
+{
+	return 0;
+}
+const struct file_operations proc_gen_core_operations = {
+	.open           = open_gencore,
+	.read           = read_gencore,
+	.release        = release_gencore,
+};
+
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 651d09a..47538f2 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -228,6 +228,7 @@ extern const struct file_operations proc_ns_dir_operations;
  */
 extern const struct file_operations proc_net_operations;
 extern const struct inode_operations proc_net_inode_operations;
+extern const struct file_operations proc_gen_core_operations;
 
 #ifdef CONFIG_NET
 extern int proc_net_init(void);

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