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由 Al Viro 提交于
we only use iov_iter_get_pages_alloc() and iov_iter_advance() - pages are filled by kernel_readv() via a kvec array (as we used to do all along), so iov_iter here is used only as a way of arranging for those pages to be in pipe. Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
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