On Thu, Apr 26, 2012 at 10:57:43AM +0800, Miao Xie wrote: > writeback_inodes_sb(_nr) grabs s_umount lock when it want to start writeback, > it may bring us deadlock problem when doing umount. So we introduce new > functions -- try_to_writeback_inodes_sb(_nr) -- which use down_read_trylock() > instead of down_read() to avoid that deadlock problem. > > This idea came from Christoph Hellwig. > Some code is from the patch of Kamal Mostafa.
This just re-implements writeback_inodes_[nr]_sb_if_idle() with a trylock instead of a blocking lock. Just replace the blocking lock in writeback_inodes_[nr]_sb_if_idle() with a trylock and use that. Cheers, Dave. -- Dave Chinner da...@fromorbit.com -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
