Al Viro cfe057f7db
iomap_dio_actor(): fix iov_iter bugs ...
1) Ignoring return value from iov_iter_zero() is wrong
for iovec-backed case as well as for pipes - it can fail.
2) Failure to fault destination pages in 25Mb into a 50Mb iovec
should not act as if nothing in the area had been read, nevermind
that the first 25Mb might have *already* been read by that point.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk >
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