Re: [PATCH 14/15] dax: associate mappings with inodes, and warn if dma collides with truncate
+ struct {
+ /*
+ * ZONE_DEVICE pages are never on an lru or handled by
+ * a slab allocator, this points to the hosting device
+ * page map.
+ */
+ struct dev_pagemap *pgmap;
+ /*
+ * inode association for MEMORY_DEVICE_FS_DAX page-idle
+ * callbacks. Note that we don't use ->mapping since
+ * that has hard coded page-cache assumptions in
+ * several paths.
+ */
What assumptions? I'd much rather fix those up than having two fields
that have the same functionality.