Re: [PATCH v4 1/5] fs: kiocb: introduce IOCB_DONT_DIRTY_PAGE flag for direct IO

[Christoph Hellwig]

As mentioned last time a big fat NAK for this one.  We generally
do not dirty kernel pages anywhere, so a flag that must alway be set
for default behavior just to prepare for a highy hypothetical user that
in the future might want to abuse the interface is a no-go.

Just make the dirtying behavior dependent on the iov_iter type:
dirty for ITER_IOVEC and do nothing for ITER_KVEC and ITER_BVEC.

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