[PATCH] JFFS2 Fix of panics caused by wrong condition for hole frag creation in write_begin

[David Woodhouse]

On Mon, 2008-04-14 at 17:55 +0100, Alexey Korolev wrote:
> Hi,
> 
> 
> JFFS2 in Linux 2.6.24 fails to kernel panic on random read/write/truncate operatons. We investigated the issue it is caused by
> bug in conditions for hole fragment creation in write_begin function. Offset of starting offset which is used to identify should we create hole frag or not is calculated improperly.
> As result hole frags are not created when they must be - it leads to internal memory corruptions and kernel panic. 
> 
> The following patch fixes the bug in JFFS2 write_begin hole frag conditions. 
> Please include the patch. 

Well spotted, Alexey. Thanks!

I've simplified it a little and sent it to Linus.

-- 
dwmw2