[PATCH v3 4/7] iomap: Fix iomap_dio_rw return value for user copies

From: Andreas Gruenbacher <agruenba@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Christoph Hellwig <hch@infradead.org>,
	"Darrick J. Wong" <djwong@kernel.org>
Cc: Jan Kara <jack@suse.cz>, Matthew Wilcox <willy@infradead.org>,
	cluster-devel@redhat.com, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, ocfs2-devel@oss.oracle.com,
	Andreas Gruenbacher <agruenba@redhat.com>
Subject: [PATCH v3 4/7] iomap: Fix iomap_dio_rw return value for user copies
Date: Fri, 23 Jul 2021 22:58:37 +0200	[thread overview]
Message-ID: <20210723205840.299280-5-agruenba@redhat.com> (raw)
In-Reply-To: <20210723205840.299280-1-agruenba@redhat.com>

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 already returns
when it gets an -EFAULT from bio_iov_iter_get_pages.

Signed-off-by: Andreas Gruenbacher <agruenba@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..cc0b4bc8861b 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 ?: -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 ?: -EFAULT;
 }
 
 static loff_t
-- 
2.26.3

