dm cache: fix write hang in passthrough mode

In the Linux kernel, the following vulnerability has been resolved:

dm cache: fix write hang in passthrough mode

The invalidate_remove() function has incomplete logic for handling write

hit bios after cache invalidation. It sets up the remapping for the

overwrite_bio but then drops it immediately without submission, causing

write operations to hang.

Fix by adding a new invalidate_committed() continuation that submits

the remapped writes to the cache origin after metadata commit completes,

while using the overwrite_endio hook to ensure proper completion

sequencing. This maintains existing coherency. Also improve error

handling in invalidate_complete() to preserve the original error status

instead of using bio_io_error() unconditionally.