On Mon, Apr 13, 2015 at 02:35:35PM +0200, Ingo Molnar wrote: > How does splice work with DAX files?
By falling back to default_file_splice_read/default_file_splice_write which doesn't use the iter ops, but instead requires a copy in the splice code. But given that the actual underlying reads and writes bypass the pagecache it's not any less effiecient than the normal pagecache based splice. > AFAICS vmsplice() won't work, as > it uses get_user_pages(), which needs struct page backing. Exactly. > Also, how > will f_op->sendpage() work? That too needs page backing. default_file_splice_read allocates it's own kernel pages, which are then passed to ->sendpage. -- 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/
