[PATCH 5.1 32/70] fuse: fix copy_file_range() in the writeback case

[Greg Kroah-Hartman]

From: Miklos Szeredi <mszeredi@xxxxxxxxxx>

commit a2bc92362941006830afa3dfad6caec1f99acbf5 upstream.

Prior to sending COPY_FILE_RANGE to userspace filesystem, we must flush all
dirty pages in both the source and destination files.

This patch adds the missing flush of the source file.

Tested on libfuse-3.5.0 with:

  libfuse/example/passthrough_ll /mnt/fuse/ -o writeback
  libfuse/test/test_syscalls /mnt/fuse/tmp/test

Fixes: 88bc7d5097a1 ("fuse: add support for copy_file_range()")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.20
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/fuse/file.c |   12 ++++++++++++
 1 file changed, 12 insertions(+)

--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3098,6 +3098,7 @@ static ssize_t fuse_copy_file_range(stru
 {
 	struct fuse_file *ff_in = file_in->private_data;
 	struct fuse_file *ff_out = file_out->private_data;
+	struct inode *inode_in = file_inode(file_in);
 	struct inode *inode_out = file_inode(file_out);
 	struct fuse_inode *fi_out = get_fuse_inode(inode_out);
 	struct fuse_conn *fc = ff_in->fc;
@@ -3121,6 +3122,17 @@ static ssize_t fuse_copy_file_range(stru
 	if (fc->no_copy_file_range)
 		return -EOPNOTSUPP;
 
+	if (fc->writeback_cache) {
+		inode_lock(inode_in);
+		err = filemap_write_and_wait_range(inode_in->i_mapping,
+						   pos_in, pos_in + len);
+		if (!err)
+			fuse_sync_writes(inode_in);
+		inode_unlock(inode_in);
+		if (err)
+			return err;
+	}
+
 	inode_lock(inode_out);
 
 	if (fc->writeback_cache) {