linux-kernel - [PATCH] pipefs unique inode numbers

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Message-ID: <Pine.LNX.4.58.0701302314210.2203@be1.lrz>
Date:	Tue, 30 Jan 2007 23:40:35 +0100 (CET)
From:	Bodo Eggert <7eggert@....de>
To:	akpm@...l.org, Jeff Layton <jlayton@...hat.com>, dev@...ru,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	torvalds@...l.org
Subject: [PATCH] pipefs unique inode numbers

change pipefs to use a unique inode number equal to the memory
address unless it would be truncated.

Signed-Off-By: Bodo Eggert <7eggert@....de>
---
Tested on i386.

--- 2.6.19/fs/pipe.c.ori	2007-01-30 22:02:46.000000000 +0100
+++ 2.6.19/fs/pipe.c	2007-01-30 23:22:27.000000000 +0100
@@ -864,6 +864,10 @@ static struct inode * get_pipe_inode(voi
 	inode->i_uid = current->fsuid;
 	inode->i_gid = current->fsgid;
 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+	/* The address of *inode is unique, so we'll get an unique inode number.
+	 * Off cause this will not work for 32 bit inodes on 64 bit systems. */
+	if (sizeof(inode->i_ino) >= sizeof(struct inode*))
+		inode->i_ino = (unsigned int) inode;
 
 	return inode;
 
-
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