From: Jérôme Glisse <[email protected]>
Add a helper to test if call to iov_iter_get_pages*() with a given
iter would result in calls to GUP (get_user_pages*()). We want to
use different tracking of page references if they are coming from
GUP (get_user_pages*()) and thus we need to know when GUP is used
for a given iter.
Changes since Jérôme's original patch:
* iov_iter_get_pages_use_gup(): do not return true for the ITER_PIPE
case, because iov_iter_get_pages() calls pipe_get_pages(), which in
turn uses get_page(), not get_user_pages().
* Remove some obsolete code, as part of rebasing onto Linux 5.3.
* Fix up the kerneldoc comment to "Return:" rather than "Returns:",
and a few other grammatical tweaks.
Signed-off-by: Jérôme Glisse <[email protected]>
Signed-off-by: John Hubbard <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: John Hubbard <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Johannes Thumshirn <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Ming Lei <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: Matthew Wilcox <[email protected]>
---
include/linux/uio.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/linux/uio.h b/include/linux/uio.h
index ab5f523bc0df..2a179af8e5a7 100644
--- a/include/linux/uio.h
+++ b/include/linux/uio.h
@@ -86,6 +86,17 @@ static inline unsigned char iov_iter_rw(const struct iov_iter *i)
return i->type & (READ | WRITE);
}
+/**
+ * iov_iter_get_pages_use_gup - report if iov_iter_get_pages(i) uses GUP
+ * @i: iterator
+ * Return: true if a call to iov_iter_get_pages*() with the iter provided in
+ * the argument would result in the use of get_user_pages*()
+ */
+static inline bool iov_iter_get_pages_use_gup(const struct iov_iter *i)
+{
+ return iov_iter_type(i) == ITER_IOVEC;
+}
+
/*
* Total number of bytes covered by an iovec.
*
--
2.22.0