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 cf42a8b939e3ed0c4e866af3905b1d4ee8ff1dff..f4157eb1f69dd0c2910ebff3904fdedf76c13ad9 100644 (file)
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -129,10 +129,13 @@ nfs4_file_flush(struct file *file, fl_owner_t id)
 }
 
 #ifdef CONFIG_NFS_V4_2
-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)
+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))
@@ -140,6 +143,20 @@ static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
        return nfs42_proc_copy(file_in, pos_in, file_out, pos_out, count);
 }
 
+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)
+{
+       ssize_t ret;
+
+       ret = __nfs4_copy_file_range(file_in, pos_in, file_out, pos_out, count,
+                                    flags);
+       if (ret == -EOPNOTSUPP || ret == -EXDEV)
+               ret = generic_copy_file_range(file_in, pos_in, file_out,
+                                             pos_out, count, flags);
+       return ret;
+}
+
 static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence)
 {
        loff_t ret;