I updated the patch description to mention that pinning may be used instead of
getting a ref:
netfs: Add a function to extract an iterator into a scatterlist
Provide a function for filling in a scatterlist from the list of pages
contained in an iterator.
If the iterator is UBUF- or IOBUF-type, the pages have a ref (WRITE) or a
pin (READ) taken on them.
If the iterator is BVEC-, KVEC- or XARRAY-type, no ref is taken on the
pages and it is left to the caller to manage their lifetime. It cannot be
assumed that a ref can be validly taken, particularly in the case of a KVEC
iterator.
David
