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[PATCH] pipefs unique inode numbers

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From: Bodo Eggert <7eggert@...>
To: <akpm@...>, Jeff Layton <jlayton@...>, <dev@...>, <linux-kernel@...>, <linux-fsdevel@...>, <torvalds@...>
Subject: [PATCH] pipefs unique inode numbers
Date: Tuesday, January 30, 2007 - 6:40 pm

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

Signed-Off-By: Bodo Eggert <7eggert@gmx.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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Messages in current thread:
[PATCH] pipefs unique inode numbers, Bodo Eggert, (Tue Jan 30, 6:40 pm)
Re: [PATCH] pipefs unique inode numbers, Jeff Layton, (Tue Jan 30, 9:19 pm)
Re: [PATCH] pipefs unique inode numbers, Jeff Layton, (Tue Jan 30, 9:37 pm)
Re: [PATCH] pipefs unique inode numbers, Linus Torvalds, (Tue Jan 30, 9:28 pm)
Re: [PATCH] pipefs unique inode numbers, Kirill Korotaev, (Wed Jan 31, 5:19 am)
Re: [PATCH] pipefs unique inode numbers, Jeff Layton, (Tue Jan 30, 10:02 pm)
Re: [PATCH] pipefs unique inode numbers, Linus Torvalds, (Tue Jan 30, 6:55 pm)
Re: [PATCH] pipefs unique inode numbers, Jeff Layton, (Tue Jan 30, 8:12 pm)