Allow mknod and mkfifo on SMB2/SMB3 mounts

The "sfu" mount option did not work on SMB2/SMB3 mounts.
With these changes when the "sfu" mount option is passed in
on an smb2/smb2.1/smb3 mount the client can emulate (and
recognize) fifo and device (character and device files).

In addition the "sfu" mount option should not conflict
with "mfsymlinks" (symlink emulation) as we will never
create "sfu" style symlinks, but using "sfu" mount option
will allow us to recognize existing symlinks, created with
Microsoft "Services for Unix" (SFU and SUA).

To enable the "sfu" mount option for SMB2/SMB3 the calling
syntax of the generic cifs/smb2/smb3 sync_read and sync_write
protocol dependent function needed to be changed (we
don't have a file struct in all cases), but this actually
ended up simplifying the code a little.

Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index f522193b7184..ea158c9dea15 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -711,23 +711,23 @@ smb2_read_data_length(char *buf)
 
 
 static int
-smb2_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
+smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
 	       struct cifs_io_parms *parms, unsigned int *bytes_read,
 	       char **buf, int *buf_type)
 {
-	parms->persistent_fid = cfile->fid.persistent_fid;
-	parms->volatile_fid = cfile->fid.volatile_fid;
+	parms->persistent_fid = pfid->persistent_fid;
+	parms->volatile_fid = pfid->volatile_fid;
 	return SMB2_read(xid, parms, bytes_read, buf, buf_type);
 }
 
 static int
-smb2_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
+smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
 		struct cifs_io_parms *parms, unsigned int *written,
 		struct kvec *iov, unsigned long nr_segs)
 {
 
-	parms->persistent_fid = cfile->fid.persistent_fid;
-	parms->volatile_fid = cfile->fid.volatile_fid;
+	parms->persistent_fid = pfid->persistent_fid;
+	parms->volatile_fid = pfid->volatile_fid;
 	return SMB2_write(xid, parms, written, iov, nr_segs);
 }