Messages in this thread | | | Date | Wed, 16 Jul 2008 19:27:38 +0530 | From | "Unmil Tambe" <> | Subject | Sync_page_io() call hangs when called from make_request (2.6.25) |
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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 msg at: http://repo.ugm.ac.id/linux/ChangeLog-2.6.22.12
"Author: Milan Broz <mbroz@redhat.com> Date: Thu Jul 12 17:28:00 2007 +0100
dm snapshot: fix invalidation deadlock
patch fcac03abd325e4f7a4cc8fe05fea2793b1c8eb75 in mainline
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
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