Hello, I am writing a stacking block device driver which writes some metadata on a block device before redirecting the data bio to underlying disk. For this I have been using sync_page_io from raid/md.h to do the metadata write synchronously. This worked fine in 2.6.18.2 kernel. I am now trying to port the driver to 2.6.25 kernel, but even in a basic stacking driver in this kernel, the sync_page_io call does not return. The process (dd in this case) never returns. The machine does not freeze, nor is there an OOPS generated. It is as if waiting on a lock. All I could find in my search was this post at: http://repo.ugm.ac.id/linux/ChangeLog-2.6.22.12 " Process persistent exception store metadata IOs in a separate thread. A snapshot may become invalid while inside generic_make_request(). A synchronous write is then needed to update the metadata while still inside that function. Since the introduction of md-dm-reduce-stack-usage-with-stacked-block-devices.patch this has to be performed by a separate thread to avoid deadlock. " I dont really know whether this is related to my problem or not. Any ideas? Thanks, Unmil Tambe -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
