CIFS: Move statfs to ops struct

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>

fs/cifs/cifsfs.c

@@ -51,7 +51,6 @@
 #ifdef CONFIG_CIFS_SMB2
 #include "smb2pdu.h"
 #endif
-#define CIFS_MAGIC_NUMBER 0xFF534D42	/* the first four bytes of SMB PDUs */
 
 int cifsFYI = 0;
 int cifsERROR = 1;
@@ -164,13 +163,12 @@ cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	struct super_block *sb = dentry->d_sb;
 	struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 	struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
-	int rc = -EOPNOTSUPP;
+	struct TCP_Server_Info *server = tcon->ses->server;
 	unsigned int xid;
+	int rc = 0;
 
 	xid = get_xid();
 
-	buf->f_type = CIFS_MAGIC_NUMBER;
-
 	/*
 	 * PATH_MAX may be too long - it would presumably be total path,
 	 * but note that some servers (includinng Samba 3) have a shorter
@@ -182,27 +180,8 @@ cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_files = 0;	/* undefined */
 	buf->f_ffree = 0;	/* unlimited */
 
-	/*
-	 * We could add a second check for a QFS Unix capability bit
-	 */
-	if ((tcon->ses->capabilities & CAP_UNIX) &&
-	    (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
-		rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
-
-	/*
-	 * Only need to call the old QFSInfo if failed on newer one,
-	 * e.g. by OS/2.
-	 **/
-	if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
-		rc = CIFSSMBQFSInfo(xid, tcon, buf);
-
-	/*
-	 * Some old Windows servers also do not support level 103, retry with
-	 * older level one if old server failed the previous call or we
-	 * bypassed it because we detected that this was an older LANMAN sess
-	 */
-	if (rc)
-		rc = SMBOldQFSInfo(xid, tcon, buf);
+	if (server->ops->queryfs)
+		rc = server->ops->queryfs(xid, tcon, buf);
 
 	free_xid(xid);
 	return 0;