new helper: mount_bdev()

[pandora-kernel.git] / fs / super.c

diff --git a/fs/super.c b/fs/super.c
index b9c9869..40989e9 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -762,10 +762,9 @@ static int test_bdev_super(struct super_block *s, void *data)
        return (void *)s->s_bdev == data;
 }
 
-int get_sb_bdev(struct file_system_type *fs_type,
+struct dentry *mount_bdev(struct file_system_type *fs_type,
        int flags, const char *dev_name, void *data,
-       int (*fill_super)(struct super_block *, void *, int),
-       struct vfsmount *mnt)
+       int (*fill_super)(struct super_block *, void *, int))
 {
        struct block_device *bdev;
        struct super_block *s;
@@ -777,7 +776,7 @@ int get_sb_bdev(struct file_system_type *fs_type,
 
        bdev = open_bdev_exclusive(dev_name, mode, fs_type);
        if (IS_ERR(bdev))
-               return PTR_ERR(bdev);
+               return ERR_CAST(bdev);
 
        /*
         * once the super is inserted into the list by sget, s_umount
@@ -829,15 +828,30 @@ int get_sb_bdev(struct file_system_type *fs_type,
                bdev->bd_super = s;
        }
 
-       simple_set_mnt(mnt, s);
-       return 0;
+       return dget(s->s_root);
 
 error_s:
        error = PTR_ERR(s);
 error_bdev:
        close_bdev_exclusive(bdev, mode);
 error:
-       return error;
+       return ERR_PTR(error);
+}
+EXPORT_SYMBOL(mount_bdev);
+
+int get_sb_bdev(struct file_system_type *fs_type,
+       int flags, const char *dev_name, void *data,
+       int (*fill_super)(struct super_block *, void *, int),
+       struct vfsmount *mnt)
+{
+       struct dentry *root;
+
+       root = mount_bdev(fs_type, flags, dev_name, data, fill_super);
+       if (IS_ERR(root))
+               return PTR_ERR(root);
+       mnt->mnt_root = root;
+       mnt->mnt_sb = root->d_sb;
+       return 0;
 }
 
 EXPORT_SYMBOL(get_sb_bdev);
@@ -918,6 +932,7 @@ struct vfsmount *
 vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data)
 {
        struct vfsmount *mnt;
+       struct dentry *root;
        char *secdata = NULL;
        int error;
 
@@ -942,9 +957,19 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
                        goto out_free_secdata;
        }
 
-       error = type->get_sb(type, flags, name, data, mnt);
-       if (error < 0)
-               goto out_free_secdata;
+       if (type->mount) {
+               root = type->mount(type, flags, name, data);
+               if (IS_ERR(root)) {
+                       error = PTR_ERR(root);
+                       goto out_free_secdata;
+               }
+               mnt->mnt_root = root;
+               mnt->mnt_sb = root->d_sb;
+       } else {
+               error = type->get_sb(type, flags, name, data, mnt);
+               if (error < 0)
+                       goto out_free_secdata;
+       }
        BUG_ON(!mnt->mnt_sb);
        WARN_ON(!mnt->mnt_sb->s_bdi);
        mnt->mnt_sb->s_flags |= MS_BORN;