iov_iter.c: macros for iterating over iov_iter

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iterate_all_kinds(iter, size, ident, step_iovec, step_bvec)
iterates through the ranges covered by iter (up to size bytes total),
repeating step_iovec or step_bvec for each of those.  ident is
declared in expansion of that thing, either as struct iovec or
struct bvec, and it contains the range we are currently looking
at.  step_bvec should be a void expression, step_iovec - a size_t
one, with non-zero meaning "stop here, that many bytes from this
range left".  In the end, the amount actually handled is stored
in size.

iov_iter_copy_from_user_atomic() and iov_iter_alignment() converted
to it.

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

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Al Viro 2014-11-27 13:51:41 -05:00

parent 5d01410fe4

commit 04a311655b

1 changed files with 86 additions and 126 deletions

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mm/iov_iter.c

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