iov_iter: separate direction from flavour

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Instead of having them mixed in iter->type, use separate ->iter_type
and ->data_source (u8 and bool resp.)  And don't bother with (pseudo-)
bitmap for the former - microoptimizations from being able to check
if the flavour is one of two values are not worth the confusion for
optimizer.  It can't prove that we never get e.g. ITER_IOVEC | ITER_PIPE,
so we end up with extra headache.

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

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Al Viro 2021-04-22 14:50:39 -04:00

parent 556351c1c0

commit 8cd54c1c84

2 changed files with 58 additions and 51 deletions

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24

include/linux/uio.h

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85

lib/iov_iter.c

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