linux-kernel - [PATCH -mm 1/2] proc/maps: replace proc_maps_private->pid with "struct inode *inode"

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Date:	Wed, 20 Aug 2014 18:49:52 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Greg Ungerer <gerg@...inux.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH -mm 1/2] proc/maps: replace proc_maps_private->pid with
	"struct inode *inode"

m_start() can use get_proc_task() instead, and "struct inode *"
provides more potentially useful info, see the next changes.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 fs/proc/internal.h   |    2 +-
 fs/proc/task_mmu.c   |    4 ++--
 fs/proc/task_nommu.c |    4 ++--
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index d271828..aa7a0ee 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -268,7 +268,7 @@ extern int proc_remount(struct super_block *, int *, char *);
  * task_[no]mmu.c
  */
 struct proc_maps_private {
-	struct pid *pid;
+	struct inode *inode;
 	struct task_struct *task;
 	struct mm_struct *mm;
 #ifdef CONFIG_MMU
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index aceff2d..828ff49 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -164,7 +164,7 @@ static void *m_start(struct seq_file *m, loff_t *ppos)
 	if (last_addr == -1UL)
 		return NULL;
 
-	priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
+	priv->task = get_proc_task(priv->inode);
 	if (!priv->task)
 		return ERR_PTR(-ESRCH);
 
@@ -231,7 +231,7 @@ static int proc_maps_open(struct inode *inode, struct file *file,
 	if (!priv)
 		return -ENOMEM;
 
-	priv->pid = proc_pid(inode);
+	priv->inode = inode;
 	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
 	if (IS_ERR(priv->mm)) {
 		int err = PTR_ERR(priv->mm);
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index 8f157e4..f1cc304 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -212,7 +212,7 @@ static void *m_start(struct seq_file *m, loff_t *pos)
 	loff_t n = *pos;
 
 	/* pin the task and mm whilst we play with them */
-	priv->task = get_pid_task(priv->pid, PIDTYPE_PID);
+	priv->task = get_proc_task(priv->inode);
 	if (!priv->task)
 		return ERR_PTR(-ESRCH);
 
@@ -275,7 +275,7 @@ static int maps_open(struct inode *inode, struct file *file,
 	if (!priv)
 		return -ENOMEM;
 
-	priv->pid = proc_pid(inode);
+	priv->inode = inode;
 	priv->mm = proc_mem_open(inode, PTRACE_MODE_READ);
 	if (IS_ERR(priv->mm)) {
 		int err = PTR_ERR(priv->mm);
-- 
1.5.5.1


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