From: Olga Kornievskaia <kolga@xxxxxxxxxx>
Add a check to disallow cross file systems copy offload, both
files are expected to be of NFS4.2+ type.
Signed-off-by: Olga Kornievskaia <kolga@xxxxxxxxxx>
---
fs/nfs/nfs4file.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 2f31f30..344e9dd 100644
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -139,8 +139,14 @@ static ssize_t nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
nfs4_stateid *cnrs = NULL;
ssize_t ret;
- if (file_in->f_inode->i_sb != file_out->f_inode->i_sb)
+ if (file_in->f_op != &nfs4_file_operations)
return -EXDEV;
+ else {
+ struct nfs_client *c_in =
+ (NFS_SERVER(file_inode(file_in)))->nfs_client;
+ if (c_in->cl_minorversion < 2)
+ return -EXDEV;
+ }
if (file_inode(file_in) == file_inode(file_out))
return -EINVAL;
--
1.8.3.1
