block: convert to advancing variants of iov_iter_get_pages{,_alloc}()
... doing revert if we end up not using some pages
Signed-off-by: 
Al Viro <viro@zeniv.linux.org.uk>
parent
1ef255e2
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... doing revert if we end up not using some pages
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>