linux-kernel - Re: [RFC PATCH 4/4] netfs: Add a function to extract an iterator into a scatterlist

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Date:   Fri, 18 Nov 2022 11:08:55 +0000
From:   David Howells <dhowells@...hat.com>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     dhowells@...hat.com, Jeff Layton <jlayton@...nel.org>,
        Steve French <sfrench@...ba.org>,
        Shyam Prasad N <nspmangalore@...il.com>,
        Rohith Surabattula <rohiths.msft@...il.com>,
        linux-cachefs@...hat.com, linux-cifs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/4] netfs: Add a function to extract an iterator into a scatterlist

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