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iov_iter: Introduce nofault flag to disable page faults

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Introduce a new nofault flag to indicate to iov_iter_get_pages not to
fault in user pages.

This is implemented by passing the FOLL_NOFAULT flag to get_user_pages,
which causes get_user_pages to fail when it would otherwise fault in a
page. We'll use the ->nofault flag to prevent iomap_dio_rw from faulting
in pages when page faults are not allowed.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2021-07-12 12:06:14 +02:00
parent 55b8fe703b
commit 3337ab08d0
2 changed files with 16 additions and 5 deletions
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1
include/linux/uio.h
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@ -35,6 +35,7 @@ struct iov_iter_state {
struct iov_iter {
u8 iter_type;
bool nofault;
bool data_source;
size_t iov_offset;
size_t count;