iomap_write_end() does not return a negative errno to indicate an
error, but the number of bytes successfully copied. It cannot return
an error today, so include a debugging assertion like the one in
iomap_unshare_iter().
Fixes: c6f40468657d ("fsdax: decouple zeroing from the iomap buffered I/O code")
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
fs/iomap/buffered-io.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index f3176cf90351..955f51f94b3f 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -901,8 +901,8 @@ static loff_t iomap_zero_iter(struct iomap_iter *iter, bool *did_zero)
mark_page_accessed(page);
bytes = iomap_write_end(iter, pos, bytes, bytes, page);
- if (bytes < 0)
- return bytes;
+ if (WARN_ON_ONCE(bytes == 0))
+ return -EIO;
pos += bytes;
length -= bytes;
--
2.33.0
