cifs: copy_file_range needs to strip setuid bits and update timestamps

cifs has both source and destination inodes locked throughout the copy.
Like ->write_iter(), we update mtime and strip setuid bits of destination
file before copy and like ->read_iter(), we update atime of source file
after copy.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 270d3c58fb3b..3289b566463f 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1104,6 +1104,10 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
                 goto out;
         }
 
+        rc = -EOPNOTSUPP;
+        if (!target_tcon->ses->server->ops->copychunk_range)
+                goto out;
+
         /*
          * Note: cifs case is easier than btrfs since server responsible for
          * checks for proper open modes and file type and if it wants
@@ -1115,11 +1119,12 @@ ssize_t cifs_file_copychunk_range(unsigned int xid,
         /* should we flush first and last page first */
         truncate_inode_pages(&target_inode->i_data, 0);
 
-        if (target_tcon->ses->server->ops->copychunk_range)
+        rc = file_modified(dst_file);
+        if (!rc)
                 rc = target_tcon->ses->server->ops->copychunk_range(xid,
                         smb_file_src, smb_file_target, off, len, destoff);
-        else
-                rc = -EOPNOTSUPP;
+
+        file_accessed(src_file);
 
         /* force revalidate of size and timestamps of target file now
          * that target is updated on the server