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NFS: replace cross device check in copy_file_range 

Add a check to disallow cross file systems copy offload, both
files are expected to be of NFS4.2+ type.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
This commit is contained in:
Olga Kornievskaia 2019-07-02 15:11:48 -04:00 committed by Olga Kornievskaia
parent 1275101026
commit 8dff1df551
1 changed files with 1 additions and 1 deletions
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fs/nfs/nfs4file.c
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@ -141,7 +141,7 @@ static ssize_t __nfs4_copy_file_range(struct file *file_in, loff_t pos_in,
bool sync = false;
/* Only offload copy if superblock is the same */
if (file_inode(file_in)->i_sb != file_inode(file_out)->i_sb)
if (file_in->f_op != &nfs4_file_operations)
return -EXDEV;
if (!nfs_server_capable(file_inode(file_out), NFS_CAP_COPY))
return -EOPNOTSUPP;