On Tue, May 31, 2011 at 01:22:53PM +0200, Jan Kara wrote: > > The problem is that with ext4, we need i_mutex in io completion path to > end page writeback. So we cannot do GFP_KERNEL allocation whenever we hold > i_mutex because mm might wait in direct reclaim for IO to complete and that > cannot happen until we release i_mutex. OK, maybe I'm being dense, but I'm not seeing it. I see where we need i_mutex on the ext4_da_writepages() codepath, but that's never used for direct reclaim. Direct reclaim only calls ext4_writepage(), and that doesn't seem to try to grab i_mutex as near as I can tell. Am I missing something? - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
