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Message-ID: <20101214154204.21048247@suzukikp>
Date: Tue, 14 Dec 2010 15:42:04 +0530
From: "Suzuki K. Poulose" <suzuki@...ibm.com>
To: linux-kernel@...r.kernel.org
Cc: "Suzuki K. Poulose" <suzuki@...ibm.com>,
Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
Christoph Hellwig <hch@....de>,
Masami Hiramatsu <mhiramat@...hat.com>,
Ananth N Mavinakayanahalli <ananth@...ibm.com>,
Daisuke HATAYAMA <d.hatayama@...fujitsu.com>,
Andi Kleen <andi@...stfloor.org>,
Roland McGrath <roland@...hat.com>,
Amerigo Wang <amwang@...hat.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Oleg Nesterov <oleg@...hat.com>,
Andrew Morton <akpm@...ux-foundation.org>
Subject: [Patch 11/21] Track the core generation requests
Keep track of the core generation requests. Concurrent core generation requests
for the same target process are not allowed.
Signed-off-by: Suzuki K. Poulose <suzuki@...ibm.com>
Signed-off-by: Ananth N.Mavinakayanahalli <ananth@...ibm.com>
---
fs/proc/gencore.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
fs/proc/gencore.h | 12 +++++++
2 files changed, 95 insertions(+), 2 deletions(-)
Index: linux-2.6.36-rc7/fs/proc/gencore.c
===================================================================
--- linux-2.6.36-rc7.orig/fs/proc/gencore.c
+++ linux-2.6.36-rc7/fs/proc/gencore.c
@@ -24,21 +24,102 @@
#include <linux/seq_file.h>
#include "internal.h"
+#include "gencore.h"
+
+static LIST_HEAD(core_list);
+static DEFINE_MUTEX(core_mutex);
+
+/* Called with core_mutex held */
+static struct core_proc* get_core_proc(struct task_struct *t)
+{
+ struct core_proc *cp;
+
+ list_for_each_entry(cp, &core_list, list) {
+ if (cp->task == t->group_leader)
+ return cp;
+ }
+ return NULL;
+}
static ssize_t read_gencore(struct file *file, char __user *buffer,
size_t buflen, loff_t *fpos)
{
- return 0;
+ struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
+ struct core_proc *cp;
+ ssize_t ret = 0;
+
+ if (!task)
+ return -EIO;
+
+ mutex_lock(&core_mutex);
+ cp = get_core_proc(task);
+ if (!cp) {
+ mutex_unlock(&core_mutex);
+ ret = -EIO;
+ goto out;
+ }
+ mutex_unlock(&core_mutex);
+
+out:
+ put_task_struct(task);
+ return ret;
}
static int release_gencore(struct inode *inode, struct file *file)
{
+ struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
+ struct core_proc *cp;
+
+ if (!task)
+ return -EIO;
+
+ mutex_lock(&core_mutex);
+ cp = get_core_proc(task);
+ if (cp) {
+ list_del(&cp->list);
+ kfree(cp);
+ }
+ mutex_unlock(&core_mutex);
+ put_task_struct(task);
return 0;
}
+/*
+ * Validate if the call is valid. We also need to prevent >1 open
+ * of the same file.
+ */
static int open_gencore(struct inode *inode, struct file *filp)
{
- return 0;
+ struct task_struct *task = get_proc_task(inode);
+ struct core_proc *cp;
+ int ret = 0;
+
+ if (!task)
+ return -ENOENT;
+
+ mutex_lock(&core_mutex);
+ cp = get_core_proc(task);
+ if (cp) {
+ ret = -EALREADY;
+ mutex_unlock(&core_mutex);
+ goto out;
+ }
+
+ cp = kzalloc(sizeof (*cp), GFP_KERNEL);
+ if (!cp) {
+ ret = -ENOMEM;
+ mutex_unlock(&core_mutex);
+ goto out;
+ }
+
+ cp->task = task->group_leader;
+ INIT_LIST_HEAD(&cp->list);
+ list_add(&cp->list, &core_list);
+ mutex_unlock(&core_mutex);
+
+out:
+ put_task_struct(task);
+ return ret;
}
const struct file_operations proc_gen_core_operations = {
Index: linux-2.6.36-rc7/fs/proc/gencore.h
===================================================================
--- /dev/null
+++ linux-2.6.36-rc7/fs/proc/gencore.h
@@ -0,0 +1,12 @@
+#ifndef __GEN_CORE_H
+#define __GEN_CORE_H
+
+#include <linux/list.h>
+#include <linux/sched.h>
+
+struct core_proc {
+ struct list_head list;
+ struct task_struct *task;
+};
+
+#endif
--
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