Hello,

On Mon, Aug 06, 2012 at 03:08:41PM -0700, Kent Overstreet wrote:

bcache creates large bios internally, and then splits them according to
the device requirements before it sends them down. If a lower level
device tries to clone the bio, and the original bio had more than
BIO_MAX_PAGES, the clone will fail unecessarily.

We can fix this by only cloning the bio vecs that are actually in use.

How was this tested?

Thanks.

-- 
tejun