3 files changed, 41 insertions, 2 deletions

diff --git a/fs/cifs/cifs_fs_sb.h b/fs/cifs/cifs_fs_sb.h
index 34af556cdd8d..8ad2330ba061 100644
--- a/fs/cifs/cifs_fs_sb.h
+++ b/fs/cifs/cifs_fs_sb.h
@@ -43,6 +43,9 @@ struct cifs_sb_info {
         mode_t  mnt_dir_mode;
         int     mnt_cifs_flags;
         int     prepathlen;
-        char   *prepath;
+        char   *prepath; /* relative path under the share to mount to */
+#ifdef CONFIG_CIFS_DFS_UPCALL
+        char   *mountdata; /* mount options received at mount time */
+#endif
 };
 #endif                          /* _CIFS_FS_SB_H */
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 000b4a5d3219..93e107883a61 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -97,6 +97,9 @@ cifs_read_super(struct super_block *sb, void *data,
 {
         struct inode *inode;
         struct cifs_sb_info *cifs_sb;
+#ifdef CONFIG_CIFS_DFS_UPCALL
+        int len;
+#endif
         int rc = 0;
 
         /* BB should we make this contingent on mount parm? */
@@ -106,6 +109,25 @@ cifs_read_super(struct super_block *sb, void *data,
         if (cifs_sb == NULL)
                 return -ENOMEM;
 
+#ifdef CONFIG_CIFS_DFS_UPCALL
+        /* copy mount params to sb for use in submounts */
+        /* BB: should we move this after the mount so we
+         * do not have to do the copy on failed mounts?
+         * BB: May be it is better to do simple copy before
+         * complex operation (mount), and in case of fail
+         * just exit instead of doing mount and attempting
+         * undo it if this copy fails?*/
+        len = strlen(data);
+        cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
+        if (cifs_sb->mountdata == NULL) {
+                kfree(sb->s_fs_info);
+                sb->s_fs_info = NULL;
+                return -ENOMEM;
+        }
+        strncpy(cifs_sb->mountdata, data, len + 1);
+        cifs_sb->mountdata[len] = '\0';
+#endif
+
         rc = cifs_mount(sb, cifs_sb, data, devname);
 
         if (rc) {
@@ -155,6 +177,12 @@ out_no_root:
 
 out_mount_failed:
         if (cifs_sb) {
+#ifdef CONFIG_CIFS_DFS_UPCALL
+                if (cifs_sb->mountdata) {
+                        kfree(cifs_sb->mountdata);
+                        cifs_sb->mountdata = NULL;
+                }
+#endif
                 if (cifs_sb->local_nls)
                         unload_nls(cifs_sb->local_nls);
                 kfree(cifs_sb);
@@ -178,6 +206,13 @@ cifs_put_super(struct super_block *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);
         kfree(cifs_sb);
         return;
@@ -553,7 +588,7 @@ static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
         return remote_llseek(file, offset, origin);
 }
 
-static struct file_system_type cifs_fs_type = {
+struct file_system_type cifs_fs_type = {
         .owner = THIS_MODULE,
         .name = "cifs",
         .get_sb = cifs_get_sb,
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 2a21dc66f0de..2e68126d07eb 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -32,6 +32,7 @@
 #define TRUE 1
 #endif
 
+extern struct file_system_type cifs_fs_type;
 extern const struct address_space_operations cifs_addr_ops;
 extern const struct address_space_operations cifs_addr_ops_smallbuf;