[RFC] BUG Power loss recovery issues in JFFS2

[Alexey Korolev]

On Thu, 15 Nov 2007, Jörn Engel wrote:

> 
> Could be a writebuffer thing.  Maybe a testcase like this will force it
> on NAND.
> 
No it is low probable. At least we were able to see the issue when JFFS2 worked with M18 like device. 
> # mount
> head -c3960 /dev/urandom > wbuf_preload
> echo 12345 > foo
> # wait long enough for write to finish, but not long enough for wbuf to
> # get flushed, hit reset button
> 
> The size of the preload should be carefully crafted.  3960 bytes plus
> node header of 68 bytes leaves exactly another 68 bytes for the next
> node header.  So the wbuf gets filled and written right after the second
> node's header, but before its data.  Works with wbuf sizes of 512, 1024,
> 2048 and 4096.
> 
You right here. We need to clearly understand why we do not see the bug for NAND. Probably the issue is in the test case.
Thanks,
Alexey