new helper: iov_iter_npages()
authorAl Viro <viro@zeniv.linux.org.uk>
Wed, 19 Mar 2014 05:16:16 +0000 (01:16 -0400)
committerAl Viro <viro@zeniv.linux.org.uk>
Tue, 6 May 2014 21:32:52 +0000 (17:32 -0400)
counts the pages covered by iov_iter, up to given limit.
do_block_direct_io() and fuse_iter_npages() switched to
it.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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