smb: client: get rid of dfs naming in automount code

Automount code will handle both DFS links and reparse mount points.

Also, get rid of BUG_ON() in cifs_release_automount_timer() while
we're at it.

Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/smb/client/cifsfs.c

@@ -1805,7 +1805,7 @@ exit_cifs(void)
 	cifs_dbg(NOISY, "exit_smb3\n");
 	unregister_filesystem(&cifs_fs_type);
 	unregister_filesystem(&smb3_fs_type);
-	cifs_dfs_release_automount_timer();
+	cifs_release_automount_timer();
 	exit_cifs_idmap();
 #ifdef CONFIG_CIFS_SWN_UPCALL
 	cifs_genl_exit();

fs/smb/client/cifsfs.h

@@ -81,7 +81,7 @@ extern int cifs_fiemap(struct inode *, struct fiemap_extent_info *, u64 start,
 
 extern const struct inode_operations cifs_file_inode_ops;
 extern const struct inode_operations cifs_symlink_inode_ops;
-extern const struct inode_operations cifs_dfs_referral_inode_operations;
+extern const struct inode_operations cifs_namespace_inode_operations;
 
 
 /* Functions related to files and directories */
@@ -119,9 +119,9 @@ extern const struct dentry_operations cifs_dentry_ops;
 extern const struct dentry_operations cifs_ci_dentry_ops;
 
 #ifdef CONFIG_CIFS_DFS_UPCALL
-extern struct vfsmount *cifs_dfs_d_automount(struct path *path);
+extern struct vfsmount *cifs_d_automount(struct path *path);
 #else
-static inline struct vfsmount *cifs_dfs_d_automount(struct path *path)
+static inline struct vfsmount *cifs_d_automount(struct path *path)
 {
 	return ERR_PTR(-EREMOTE);
 }

fs/smb/client/cifsproto.h

@@ -296,9 +296,9 @@ extern void cifs_put_tcp_session(struct TCP_Server_Info *server,
 extern void cifs_put_tcon(struct cifs_tcon *tcon);
 
 #if IS_ENABLED(CONFIG_CIFS_DFS_UPCALL)
-extern void cifs_dfs_release_automount_timer(void);
+extern void cifs_release_automount_timer(void);
 #else /* ! IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) */
-#define cifs_dfs_release_automount_timer()	do { } while (0)
+#define cifs_release_automount_timer()	do { } while (0)
 #endif /* ! IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) */
 
 void cifs_proc_init(void);

fs/smb/client/dir.c

@@ -797,7 +797,7 @@ cifs_d_revalidate(struct dentry *direntry, unsigned int flags)
 
 const struct dentry_operations cifs_dentry_ops = {
 	.d_revalidate = cifs_d_revalidate,
-	.d_automount = cifs_dfs_d_automount,
+	.d_automount = cifs_d_automount,
 /* d_delete:       cifs_d_delete,      */ /* not needed except for debugging */
 };
 
@@ -872,5 +872,5 @@ const struct dentry_operations cifs_ci_dentry_ops = {
 	.d_revalidate = cifs_d_revalidate,
 	.d_hash = cifs_ci_hash,
 	.d_compare = cifs_ci_compare,
-	.d_automount = cifs_dfs_d_automount,
+	.d_automount = cifs_d_automount,
 };

fs/smb/client/inode.c

@@ -60,7 +60,7 @@ static void cifs_set_ops(struct inode *inode)
 	case S_IFDIR:
 #ifdef CONFIG_CIFS_DFS_UPCALL
 		if (IS_AUTOMOUNT(inode)) {
-			inode->i_op = &cifs_dfs_referral_inode_operations;
+			inode->i_op = &cifs_namespace_inode_operations;
 		} else {
 #else /* NO DFS support, treat as a directory */
 		{

fs/smb/client/namespace.c

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
- *   Contains the CIFS DFS referral mounting routines used for handling
- *   traversal via DFS junction point
+ *   Contains mounting routines used for handling traversal via SMB junctions.
  *
  *   Copyright (c) 2007 Igor Mammedov
  *   Copyright (C) International Business Machines  Corp., 2008
@@ -24,27 +23,28 @@
 #include "dfs.h"
 #include "fs_context.h"
 
-static LIST_HEAD(cifs_dfs_automount_list);
+static LIST_HEAD(cifs_automount_list);
 
-static void cifs_dfs_expire_automounts(struct work_struct *work);
-static DECLARE_DELAYED_WORK(cifs_dfs_automount_task,
-			    cifs_dfs_expire_automounts);
-static int cifs_dfs_mountpoint_expiry_timeout = 500 * HZ;
+static void cifs_expire_automounts(struct work_struct *work);
+static DECLARE_DELAYED_WORK(cifs_automount_task,
+			    cifs_expire_automounts);
+static int cifs_mountpoint_expiry_timeout = 500 * HZ;
 
-static void cifs_dfs_expire_automounts(struct work_struct *work)
+static void cifs_expire_automounts(struct work_struct *work)
 {
-	struct list_head *list = &cifs_dfs_automount_list;
+	struct list_head *list = &cifs_automount_list;
 
 	mark_mounts_for_expiry(list);
 	if (!list_empty(list))
-		schedule_delayed_work(&cifs_dfs_automount_task,
-				      cifs_dfs_mountpoint_expiry_timeout);
+		schedule_delayed_work(&cifs_automount_task,
+				      cifs_mountpoint_expiry_timeout);
 }
 
-void cifs_dfs_release_automount_timer(void)
+void cifs_release_automount_timer(void)
 {
-	BUG_ON(!list_empty(&cifs_dfs_automount_list));
-	cancel_delayed_work_sync(&cifs_dfs_automount_task);
+	if (WARN_ON(!list_empty(&cifs_automount_list)))
+		return;
+	cancel_delayed_work_sync(&cifs_automount_task);
 }
 
 /**
@@ -132,7 +132,7 @@ static int set_dest_addr(struct smb3_fs_context *ctx)
 /*
  * Create a vfsmount that we can automount
  */
-static struct vfsmount *cifs_dfs_do_automount(struct path *path)
+static struct vfsmount *cifs_do_automount(struct path *path)
 {
 	int rc;
 	struct dentry *mntpt = path->dentry;
@@ -214,25 +214,25 @@ static struct vfsmount *cifs_dfs_do_automount(struct path *path)
 /*
  * Attempt to automount the referral
  */
-struct vfsmount *cifs_dfs_d_automount(struct path *path)
+struct vfsmount *cifs_d_automount(struct path *path)
 {
 	struct vfsmount *newmnt;
 
 	cifs_dbg(FYI, "%s: %pd\n", __func__, path->dentry);
 
-	newmnt = cifs_dfs_do_automount(path);
+	newmnt = cifs_do_automount(path);
 	if (IS_ERR(newmnt)) {
 		cifs_dbg(FYI, "leaving %s [automount failed]\n" , __func__);
 		return newmnt;
 	}
 
 	mntget(newmnt); /* prevent immediate expiration */
-	mnt_set_expiry(newmnt, &cifs_dfs_automount_list);
-	schedule_delayed_work(&cifs_dfs_automount_task,
-			      cifs_dfs_mountpoint_expiry_timeout);
+	mnt_set_expiry(newmnt, &cifs_automount_list);
+	schedule_delayed_work(&cifs_automount_task,
+			      cifs_mountpoint_expiry_timeout);
 	cifs_dbg(FYI, "leaving %s [ok]\n" , __func__);
 	return newmnt;
 }
 
-const struct inode_operations cifs_dfs_referral_inode_operations = {
+const struct inode_operations cifs_namespace_inode_operations = {
 };