fuse: fix copy_file_range() in the writeback case

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@vger.kernel.org> # v4.20
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index c1064866c402..4141d94de4ff 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -3110,6 +3110,7 @@ static ssize_t fuse_copy_file_range(struct file *file_in, loff_t pos_in,
 {
         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;
@@ -3133,6 +3134,17 @@ static ssize_t fuse_copy_file_range(struct file *file_in, loff_t pos_in,
         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) {