vfs: allow copy_file_range to copy across devices

[mirror_ubuntu-jammy-kernel.git] / fs / nfs / nfs4file.c

diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 4842f3ab31615d5c38797c2ad72b66eaa012d4c4..f4157eb1f69dd0c2910ebff3904fdedf76c13ad9 100644 (file)
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -133,6 +133,9 @@ static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
                                      struct file *file_out, loff_t pos_out,
                                      size_t count, unsigned int flags)
 {
+       /* Only offload copy if superblock is the same */
+       if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
+               return -EXDEV;
        if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY))
                return -EOPNOTSUPP;
        if (file_inode(file_in) == file_inode(file_out))
@@ -148,7 +151,7 @@ static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
 
        ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
                                     flags);
-       if (ret == -EOPNOTSUPP)
+       if (ret == -EOPNOTSUPP || ret == -EXDEV)
                ret = generic_copy_file_range(file_in, pos_in, file_out,
                                              pos_out, count, flags);
        return ret;