linux-kernel - [RFC PATCH 4/5] proc: introduce pid_entry

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Message-ID: <20140808185759.GA791@redhat.com>
Date:	Fri, 8 Aug 2014 20:57:59 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	David Howells <dhowells@...hat.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Peter Zijlstra <peterz@...radead.org>,
	Sasha Levin <levinsasha928@...il.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 4/5] proc: introduce pid_entry_name()

Yes, this is ugly. I think we should simply export struct pid_entry,
or make is_tgid_pid_entry/pid_entry_name "struct inode *". Or something
else. Lets discuss this later.

See the next patch which explains why.

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
---
 fs/proc/base.c     |    7 +++++++
 fs/proc/internal.h |    1 +
 2 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 368f6fe..81d372c 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2992,6 +2992,13 @@ bool is_tgid_pid_entry(const struct pid_entry *p)
 	BUG();
 }
 
+// THIS IS UGLY, JUST TO DISCUSS RFC
+const char *pid_entry_name(const struct pid_entry *p)
+{
+	is_tgid_pid_entry(p);	// trigger BUG_ON() if not valid
+	return p->name;
+}
+
 static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx)
 {
 	return proc_pident_readdir(file, ctx,
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 46500af..c162db2 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -150,6 +150,7 @@ out:
 extern const struct file_operations proc_tid_children_operations;
 
 extern bool is_tgid_pid_entry(const struct pid_entry *p);
+extern const char *pid_entry_name(const struct pid_entry *p);
 
 extern int proc_pid_stat(struct seq_file *, struct pid_namespace *,
 			 struct pid *, struct task_struct *);
-- 
1.5.5.1

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