diff mbox series

[v2,02/13] CIFS: add cross-device check for copy_file_range

Message ID 20181024195837.35532-4-olga.kornievskaia@gmail.com (mailing list archive)
State New, archived
Headers show
Series client-side support for "inter" SSC copy | expand

Commit Message

Olga Kornievskaia Oct. 24, 2018, 7:58 p.m. UTC 
From: Olga Kornievskaia <kolga@netapp.com>

VFS copy_file_range was relaxed to allow for cross-device copy.
Add a check for now, to disallow cross-device copy offload until
appropriate support is added.

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
---
 fs/cifs/cifsfs.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 7065426..1f41e74 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -1114,6 +1114,8 @@  static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
 	unsigned int xid = get_xid();
 	ssize_t rc;
 
+	if (src_file->f_inode->i_sb != dst_file->f_inode->i_sb)
+		return -EXDEV;
 	rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
 					len, flags);
 	free_xid(xid);