iomap_dio_actor(): fix iov_iter bugs

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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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Al Viro 2017-09-11 21:17:09 +01:00 • committed by Al Viro

parent 8ececffa12

commit cfe057f7db

1 changed files with 15 additions and 9 deletions

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fs/iomap.c

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