tree 95f92a36480525b3918b6e1a6d9b26d236160565
parent 8ececffa12f5555171075ce52e1226f570836b26
author Al Viro <viro@ZenIV.linux.org.uk> 1505161029 +0100
committer Al Viro <viro@zeniv.linux.org.uk> 1507775882 -0400

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>