cifs: Unconditionally copy mount options to superblock info

Previously mount options were copied and updated in the cifs_sb_info
struct only when CONFIG_CIFS_DFS_UPCALL was enabled.  Making this
information generally available allows us to remove a number of ifdefs,
extra function params, and temporary variables.
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Sean Finney <seanius@seanius.net>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifs_fs_sb.h

@@ -58,9 +58,7 @@ struct cifs_sb_info {
 	unsigned int mnt_cifs_flags;
 	int	prepathlen;
 	char   *prepath; /* relative path under the share to mount to */
-#ifdef CONFIG_CIFS_DFS_UPCALL
-	char   *mountdata; /* mount options received at mount time */
-#endif
+	char   *mountdata; /* options received at mount time or via DFS refs */
 	struct backing_dev_info bdi;
 	struct delayed_work prune_tlinks;
 };

fs/cifs/cifsfs.c

@@ -128,7 +128,6 @@ cifs_read_super(struct super_block *sb, void *data,
 	}
 	cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
 
-#ifdef CONFIG_CIFS_DFS_UPCALL
 	/*
 	 * Copy mount params to sb for use in submounts. Better to do
 	 * the copy here and deal with the error before cleanup gets
@@ -143,9 +142,8 @@ cifs_read_super(struct super_block *sb, void *data,
 			return -ENOMEM;
 		}
 	}
-#endif
 
-	rc = cifs_mount(sb, cifs_sb, data, devname);
+	rc = cifs_mount(sb, cifs_sb, devname);
 
 	if (rc) {
 		if (!silent)
@@ -197,12 +195,10 @@ cifs_read_super(struct super_block *sb, void *data,
 
 out_mount_failed:
 	if (cifs_sb) {
-#ifdef CONFIG_CIFS_DFS_UPCALL
 		if (cifs_sb->mountdata) {
 			kfree(cifs_sb->mountdata);
 			cifs_sb->mountdata = NULL;
 		}
-#endif
 		unload_nls(cifs_sb->local_nls);
 		bdi_destroy(&cifs_sb->bdi);
 		kfree(cifs_sb);
@@ -226,12 +222,10 @@ cifs_put_super(struct super_block *sb)
 	rc = cifs_umount(sb, cifs_sb);
 	if (rc)
 		cERROR(1, "cifs_umount failed with return code %d", rc);
-#ifdef CONFIG_CIFS_DFS_UPCALL
 	if (cifs_sb->mountdata) {
 		kfree(cifs_sb->mountdata);
 		cifs_sb->mountdata = NULL;
 	}
-#endif
 
 	unload_nls(cifs_sb->local_nls);
 	bdi_destroy(&cifs_sb->bdi);

fs/cifs/cifsproto.h

@@ -148,7 +148,7 @@ extern struct cifs_ntsd *get_cifs_acl(struct cifs_sb_info *, struct inode *,
 extern int set_cifs_acl(struct cifs_ntsd *, __u32, struct inode *,
 				const char *);
 
-extern int cifs_mount(struct super_block *, struct cifs_sb_info *, char *,
+extern int cifs_mount(struct super_block *, struct cifs_sb_info *,
 			const char *);
 extern int cifs_umount(struct super_block *, struct cifs_sb_info *);
 extern void cifs_dfs_release_automount_timer(void);

fs/cifs/connect.c

@@ -2842,7 +2842,7 @@ expand_dfs_referral(int xid, struct cifsSesInfo *pSesInfo,
 
 int
 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
-		char *mount_data_global, const char *devname)
+		const char *devname)
 {
 	int rc;
 	int xid;
@@ -2851,13 +2851,10 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 	struct cifsTconInfo *tcon;
 	struct TCP_Server_Info *srvTcp;
 	char   *full_path;
-	char *mount_data = mount_data_global;
 	struct tcon_link *tlink;
 #ifdef CONFIG_CIFS_DFS_UPCALL
 	int referral_walks_count = 0;
 try_mount_again:
-	mount_data = cifs_sb->mountdata;
-
 	/* cleanup activities if we're chasing a referral */
 	if (referral_walks_count) {
 		if (tcon)
@@ -2884,7 +2881,8 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
 		goto out;
 	}
 
-	if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
+	if (cifs_parse_mount_options(cifs_sb->mountdata, devname,
+				     volume_info)) {
 		rc = -EINVAL;
 		goto out;
 	}