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Date: Sat, 24 Nov 2001 07:50:45 +0100
From: Andrea Arcangeli <andrea@suse.de>
To: Alexander Viro <viro@math.psu.edu>
Cc: Linus Torvalds <torvalds@transmeta.com>, linux-kernel@vger.kernel.org,
        Marcelo Tosatti <marcelo@conectiva.com.br>
Subject: Re: 2.4.15-pre9 breakage (inode.c)
Message-ID: <20011124075045.B1601@athlon.random>
In-Reply-To: <Pine.GSO.4.21.0111240129470.4000-100000@weyl.math.psu.edu> <Pine.GSO.4.21.0111240132290.4000-100000@weyl.math.psu.edu>
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In-Reply-To: <Pine.GSO.4.21.0111240132290.4000-100000@weyl.math.psu.edu>; from viro@math.psu.edu on Sat, Nov 24, 2001 at 01:37:22AM -0500
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On Sat, Nov 24, 2001 at 01:37:22AM -0500, Alexander Viro wrote:
> 
> 
> On Sat, 24 Nov 2001, Alexander Viro wrote:
> 
> > On Sat, 24 Nov 2001, Andrea Arcangeli wrote:
> > 
> > > you are screwed because you were running a broken filesystem: it is its
> > > own business to drop the inodes if it fails, all it needs to do is to
> > > call invalidate_inodes(s) internally before returning from the read_super
> > > in the failure case.
> > 
> > Cute.  Do you realize that _every_ fs would have to do that?
> 
> Put it that way:
> 	* if ->read_super() decides to fail, it should evict all inodes
> it had put into icache.
> 	* if ->put_super() does any iput(), it should take care to evict
> that inode from icache.

exactly.

> IOW,
> 	* if we do iput() while we are outside of (success of ->read_super(),
> call of ->put_super()) - we want that inode to be evicted ASAP.
> 
> Which is precisely what 2.4.15+patch does.

and it's slower and overlay complex compared to the right fix:

--- 2.4.15aa1/fs/ext2/super.c.~1~	Fri Nov 23 08:21:00 2001
+++ 2.4.15aa1/fs/ext2/super.c	Sat Nov 24 07:50:19 2001
@@ -643,6 +643,7 @@
 			printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n");
 		} else
 			printk(KERN_ERR "EXT2-fs: get root inode failed\n");
+		invalidate_inodes(sb);
 		goto failed_mount2;
 	}
 	ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY);

Andrea
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