changelog:
dm delay: fix a crash when invalid device is specified
ANDROID: sdcardfs: fix size of inode
fs: sdcardfs: Add missing option to show_options
fs: writeback-fixes
UPSTREAM: readahead: stricter check for bdi io_pages
UPSTREAM: mm: don't cap request size based on read-ahead setting
UPSTREAM: dm: do not allow readahead to limit IO size