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SubjectRe: [PATCH 5/9] writeback: introduce the pageout work
  Hello,

On Thu 08-03-12 23:31:13, Wu Fengguang wrote:
> On Wed, Mar 07, 2012 at 05:48:21PM +0200, Artem Bityutskiy wrote:
> > On Sat, 2012-03-03 at 21:55 +0800, Fengguang Wu wrote:
> > > 13 1125 /c/linux/fs/ubifs/file.c <<do_truncation>> <===== deadlockable
> >
> > Sorry, but could you please explain once again how the deadlock may
> > happen?
>
> Sorry I confused ubifs do_truncation() with the truncate_inode_pages()
> that may be called from iput().
>
> The once suspected deadlock scheme is when the flusher thread calls
> the final iput:
>
> flusher thread
> iput_final
> <some ubifs function>
> ubifs_budget_space
> shrink_liability
> writeback_inodes_sb
> writeback_inodes_sb_nr
> bdi_queue_work
> wait_for_completion => end up waiting for the flusher itself
>
> However I cannot find any ubifs functions to form the above loop, so
> ubifs should be safe for now.
Yeah, me neither but I also failed to find a place where
ubifs_evict_inode() truncates inode space when deleting the inode... Artem?

Honza
--
Jan Kara <jack@suse.cz>
SUSE Labs, CR


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