From: Ed Tsai <redacted>

Filesystems may define their own splice write. Therefore, use file
fops instead of invoking iter_file_splice_write() directly.

Signed-off-by: Ed Tsai <redacted>
---
 fs/backing-file.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/backing-file.c b/fs/backing-file.c
index 740185198db3..687a7fae7d25 100644
--- a/fs/backing-file.c
+++ b/fs/backing-file.c

@@ -280,13 +280,16 @@ ssize_t backing_file_splice_write(struct

pipe_inode_info *pipe,
 	if (WARN_ON_ONCE(!(out->f_mode & FMODE_BACKING)))
 		return -EIO;
 
+	if (out->f_op->splice_write)
+		return -EINVAL;
+
 	ret = file_remove_privs(ctx->user_file);
 	if (ret)
 		return ret;
 
 	old_cred = override_creds(ctx->cred);
 	file_start_write(out);
-	ret = iter_file_splice_write(pipe, out, ppos, len, flags);
+	ret = out->f_op->splice_write(pipe, out, ppos, len, flags);
 	file_end_write(out);
 	revert_creds(old_cred);