On Mon, May 10, 2021 at 03:27:56PM -0700, Darrick J. Wong wrote:

On Mon, May 10, 2021 at 09:12:01PM +0100, Matthew Wilcox (Oracle) wrote:

quoted

A readahead request will not allocate more memory than can be represented
by a size_t, even on systems that have HIGHMEM available.  Change the
length functions from returning an loff_t to a size_t.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

Looks reasonable to me; is this a 5.13 bugfix or just something that
doesn't look right (i.e. save it for 5.14)?

Reviewed-by: Darrick J. Wong <djwong@kernel.org>

Thanks!  Linus was unhappy about it, and I promised to fix it.  I leave
it up to Andrew whether he wants to see this in 5.13 or 5.14.

https://lore.kernel.org/linux-btrfs/CAHk-=wj1KRvb=hie1VUTGo1D_ckD+Suo0-M2Nh5Kek1Wu=2Ppw@mail.gmail.com/ (local)

(I went a little beyond what he was directly unhappy with and reviewed
all the readahead.*length users for unnecessary loff_t usage)