CIFS: Move protocol specific tcon/tdis code to ops struct

and rename variables around the code changes.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>

fs/cifs/cifsglob.h

@@ -160,6 +160,7 @@ struct mid_q_entry;
 struct TCP_Server_Info;
 struct cifsFileInfo;
 struct cifs_ses;
+struct cifs_tcon;
 
 struct smb_version_operations {
 	int (*send_cancel)(struct TCP_Server_Info *, void *,
@@ -201,6 +202,11 @@ struct smb_version_operations {
 			  const struct nls_table *);
 	/* close smb session */
 	int (*logoff)(const unsigned int, struct cifs_ses *);
+	/* connect to a server share */
+	int (*tree_connect)(const unsigned int, struct cifs_ses *, const char *,
+			    struct cifs_tcon *, const struct nls_table *);
+	/* close tree connecion */
+	int (*tree_disconnect)(const unsigned int, struct cifs_tcon *);
 };
 
 struct smb_version_values {

fs/cifs/cifsproto.h

@@ -184,9 +184,9 @@ extern int cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
 			      struct nls_table *nls_info);
 extern int CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses);
 
-extern int CIFSTCon(unsigned int xid, struct cifs_ses *ses,
-			const char *tree, struct cifs_tcon *tcon,
-			const struct nls_table *);
+extern int CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
+		    const char *tree, struct cifs_tcon *tcon,
+		    const struct nls_table *);
 
 extern int CIFSFindFirst(const int xid, struct cifs_tcon *tcon,
 		const char *searchName, const struct nls_table *nls_codepage,
@@ -389,7 +389,7 @@ extern int CIFSSMBPosixLock(const int xid, struct cifs_tcon *tcon,
 			const loff_t start_offset, const __u64 len,
 			struct file_lock *, const __u16 lock_type,
 			const bool waitFlag);
-extern int CIFSSMBTDis(const int xid, struct cifs_tcon *tcon);
+extern int CIFSSMBTDis(const unsigned int xid, struct cifs_tcon *tcon);
 extern int CIFSSMBEcho(struct TCP_Server_Info *server);
 extern int CIFSSMBLogoff(const unsigned int xid, struct cifs_ses *ses);
 

fs/cifs/cifssmb.c

@@ -694,7 +694,7 @@ neg_err_exit:
 }
 
 int
-CIFSSMBTDis(const int xid, struct cifs_tcon *tcon)
+CIFSSMBTDis(const unsigned int xid, struct cifs_tcon *tcon)
 {
 	struct smb_hdr *smb_buffer;
 	int rc = 0;

fs/cifs/connect.c

@@ -2542,7 +2542,7 @@ cifs_find_tcon(struct cifs_ses *ses, const char *unc)
 static void
 cifs_put_tcon(struct cifs_tcon *tcon)
 {
-	int xid;
+	unsigned int xid;
 	struct cifs_ses *ses = tcon->ses;
 
 	cFYI(1, "%s: tc_count=%d", __func__, tcon->tc_count);
@@ -2556,7 +2556,8 @@ cifs_put_tcon(struct cifs_tcon *tcon)
 	spin_unlock(&cifs_tcp_ses_lock);
 
 	xid = GetXid();
-	CIFSSMBTDis(xid, tcon);
+	if (ses->server->ops->tree_disconnect)
+		ses->server->ops->tree_disconnect(xid, tcon);
 	_FreeXid(xid);
 
 	cifs_fscache_release_super_cookie(tcon);
@@ -2581,6 +2582,11 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
 		return tcon;
 	}
 
+	if (!ses->server->ops->tree_connect) {
+		rc = -ENOSYS;
+		goto out_fail;
+	}
+
 	tcon = tconInfoAlloc();
 	if (tcon == NULL) {
 		rc = -ENOMEM;
@@ -2603,13 +2609,15 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
 		goto out_fail;
 	}
 
-	/* BB Do we need to wrap session_mutex around
-	 * this TCon call and Unix SetFS as
-	 * we do on SessSetup and reconnect? */
+	/*
+	 * BB Do we need to wrap session_mutex around this TCon call and Unix
+	 * SetFS as we do on SessSetup and reconnect?
+	 */
 	xid = GetXid();
-	rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
+	rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
+					    volume_info->local_nls);
 	FreeXid(xid);
-	cFYI(1, "CIFS Tcon rc = %d", rc);
+	cFYI(1, "Tcon rc = %d", rc);
 	if (rc)
 		goto out_fail;
 
@@ -2618,10 +2626,11 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
 		cFYI(1, "DFS disabled (%d)", tcon->Flags);
 	}
 	tcon->seal = volume_info->seal;
-	/* we can have only one retry value for a connection
-	   to a share so for resources mounted more than once
-	   to the same server share the last value passed in
-	   for the retry flag is used */
+	/*
+	 * We can have only one retry value for a connection to a share so for
+	 * resources mounted more than once to the same server share the last
+	 * value passed in for the retry flag is used.
+	 */
 	tcon->retry = volume_info->retry;
 	tcon->nocase = volume_info->nocase;
 	tcon->local_lease = volume_info->local_lease;
@@ -2755,37 +2764,41 @@ out:
 }
 
 int
-get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path,
-	     const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
-	     struct dfs_info3_param **preferrals, int remap)
+get_dfs_path(int xid, struct cifs_ses *ses, const char *old_path,
+	     const struct nls_table *nls_codepage, unsigned int *num_referrals,
+	     struct dfs_info3_param **referrals, int remap)
 {
 	char *temp_unc;
 	int rc = 0;
 
-	*pnum_referrals = 0;
-	*preferrals = NULL;
+	if (!ses->server->ops->tree_connect)
+		return -ENOSYS;
+
+	*num_referrals = 0;
+	*referrals = NULL;
 
-	if (pSesInfo->ipc_tid == 0) {
+	if (ses->ipc_tid == 0) {
 		temp_unc = kmalloc(2 /* for slashes */ +
-			strnlen(pSesInfo->serverName,
-				SERVER_NAME_LEN_WITH_NULL * 2)
-				 + 1 + 4 /* slash IPC$ */  + 2,
-				GFP_KERNEL);
+			strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2)
+				+ 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL);
 		if (temp_unc == NULL)
 			return -ENOMEM;
 		temp_unc[0] = '\\';
 		temp_unc[1] = '\\';
-		strcpy(temp_unc + 2, pSesInfo->serverName);
-		strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
-		rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
-		cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
+		strcpy(temp_unc + 2, ses->serverName);
+		strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$");
+		rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL,
+						    nls_codepage);
+		cFYI(1, "Tcon rc = %d ipc_tid = %d", rc, ses->ipc_tid);
 		kfree(temp_unc);
 	}
 	if (rc == 0)
-		rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
-				     pnum_referrals, nls_codepage, remap);
-	/* BB map targetUNCs to dfs_info3 structures, here or
-		in CIFSGetDFSRefer BB */
+		rc = CIFSGetDFSRefer(xid, ses, old_path, referrals,
+				     num_referrals, nls_codepage, remap);
+	/*
+	 * BB - map targetUNCs to dfs_info3 structures, here or in
+	 * CIFSGetDFSRefer.
+	 */
 
 	return rc;
 }
@@ -3777,7 +3790,7 @@ out:
  * pointer may be NULL.
  */
 int
-CIFSTCon(unsigned int xid, struct cifs_ses *ses,
+CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
 	 const char *tree, struct cifs_tcon *tcon,
 	 const struct nls_table *nls_codepage)
 {

fs/cifs/smb1ops.c

@@ -432,6 +432,8 @@ struct smb_version_operations smb1_operations = {
 	.negotiate = cifs_negotiate,
 	.sess_setup = CIFS_SessSetup,
 	.logoff = CIFSSMBLogoff,
+	.tree_connect = CIFSTCon,
+	.tree_disconnect = CIFSSMBTDis,
 };
 
 struct smb_version_values smb1_values = {