On Thu, Sep 20, 2012 at 05:25:55PM -0700, Tejun Heo wrote: > Hello, Kent. > > On Mon, Sep 10, 2012 at 05:22:30PM -0700, Kent Overstreet wrote: > > A bunch of what __blk_queue_bounce() was doing was problematic for the > > immutable bvec work; this cleans that up and the code is quite a bit > > smaller, too. > > > > The __bio_for_each_segment() in copy_to_high_bio_irq() was changed > > because that one's looping over the original bio, not the bounce bio - > > since the bounce code doesn't own that bio the __ version wasn't > > correct. > > I do like the new implementation. I think the function is broken > before and after tho. Allocating from fs_bio_set from block layer is > never safe and nothing seems to prevent multiple allocators compete in > the bounce page mempool. This will need a separate bioset and the > multiple mempool allocation would have to be put inside a mutex.
Yeah, I should've at least made a note of that. I should really add "audit all uses of fs_bio_set" to my todo list. > Also, how was this tested? Changed queue_bounce_pfn() to return 0, forcing all io to be bounced. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
