[Cluster-devel] [PATCH v5 08/12] iomap: Fix iomap_dio_rw return value for user copies

[Andreas Gruenbacher]

When a user copy fails in one of the helpers of iomap_dio_rw, fail with -EFAULT
instead of returning 0.  This matches what iomap_dio_bio_actor returns when it
gets an -EFAULT from bio_iov_iter_get_pages.  With these changes,
iomap_dio_actor consistently fails with -EFAULT when a user page cannot be
faulted in.

Signed-off-by: Andreas Gruenbacher <agrue...@redhat.com>
---
 fs/iomap/direct-io.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 9398b8c31323..8054f5d6c273 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -370,7 +370,7 @@ iomap_dio_hole_actor(loff_t length, struct iomap_dio *dio)
 {
        length = iov_iter_zero(length, dio->submit.iter);
        dio->size += length;
-       return length;
+       return length ? length : -EFAULT;
 }
 
 static loff_t
@@ -397,7 +397,7 @@ iomap_dio_inline_actor(struct inode *inode, loff_t pos, 
loff_t length,
                copied = copy_to_iter(iomap->inline_data + pos, length, iter);
        }
        dio->size += copied;
-       return copied;
+       return copied ? copied : -EFAULT;
 }
 
 static loff_t
-- 
2.26.3