18 struct vfs_superblock_t *vfs_root_sb = NULL;
34     struct vfs_dir_entry_t *target_dentry = NULL;  in vfs_mount_fs()
37     if (target_dentry == NULL)  in vfs_mount_fs()
38         return NULL;  in vfs_mount_fs()
40     struct vfs_filesystem_type_t *p = NULL;  in vfs_mount_fs()
66     return NULL;  in vfs_mount_fs()
77     struct vfs_filesystem_type_t *p = NULL;  in vfs_register_filesystem()
97             fs->next = NULL;  in vfs_unregister_filesystem()
116         return NULL;  in vfs_search_dentry_list()
119     struct vfs_dir_entry_t *d_ptr = NULL;  in vfs_search_dentry_list()
128     return NULL;  in vfs_search_dentry_list()
149     struct vfs_dir_entry_t *dentry = NULL;  in vfs_path_walk()
170         if (dentry == NULL)  in vfs_path_walk()
179             if (parent->dir_inode->inode_ops->lookup(parent->dir_inode, dentry) == NULL)  in vfs_path_walk()
185                 return NULL;  in vfs_path_walk()
286     if (parent_dir == NULL)  in vfs_mkdir()
295     if (vfs_path_walk((const char *)path, 0) != NULL)  in vfs_mkdir()
391     if (path == NULL)  in do_open()
408     if (dentry == NULL && flags & O_CREAT)  in do_open()
421         struct vfs_dir_entry_t *parent_dentry = NULL;  in do_open()
428             if (parent_dentry == NULL)  in do_open()
465         struct vfs_dir_entry_t *next_dentry = NULL;  in do_open()
473         if (next_dentry != NULL)  in do_open()
482     if (dentry == NULL)  in do_open()
554     if (current_pcb->fds[fd_num] == NULL)  in vfs_close()
563     current_pcb->fds[fd_num] = NULL;  in vfs_close()
575         return NULL;  in vfs_alloc_dentry()
577     if (unlikely(dentry == NULL))  in vfs_alloc_dentry()
578         return NULL;  in vfs_alloc_dentry()
605     BUG_ON(dentry->dir_inode == NULL);  in vfs_may_delete()
672     if (dentry == NULL)  in vfs_rmdir()
729     if (unlikely(mnt_userns != NULL))  in vfs_unlink()
823     if (dentry == NULL || dentry->parent == NULL)  in do_unlink_at()
833     retval = vfs_unlink(NULL, dentry->parent->dir_inode, dentry, NULL);  in do_unlink_at()