E. Zadok and I. Badulescu. A stackable file system interface for Linux. In LinuxExpo 99, May 1999.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....stackable layers to leverage existing functionality provided by file systems implemented in the kernel. The extensible file systems in Spring [9] Lofs, Rot13fs and Usenetfs are examples of file systems that use stackable layers and are discussed in A Stackable File System Interface For Linux [8]. The Fiscus Replicated File System [10] describes how stackable layers provide replication of files. An implementation of a cryptographic file system in Linux, Cryptfs [11] demonstrates how stackable layers can be used to create a useful file system by leveraging the existing file system ....

....of files. An implementation of a cryptographic file system in Linux, Cryptfs [11] demonstrates how stackable layers can be used to create a useful file system by leveraging the existing file system functionality. Stackable layers use 1 Adapted from A Stackable File System Interface for Linux [8] . 9 the VFS interface and vnodes to layer functional operations one on top of the other. Stackable layers are described in more detail in Vnodes: An architecture for Multiple File System Types in Sun UNIX [12] The process of developing file system functionality in the kernel is difficult due ....

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E. Zadok and I. Badulescu, "A Stackable File System Interface For Linux," Columbia University, Technical Report 1998.

....appear just the same as local file system accesses. The SFS implementation we describe in this paper is only one instantiation of the SFS architecture. We believe SFS Client and Group Server described here can be plugged into other distributed and local file systems with little difficulty [10] [13]. In the next sections, we describe our initial SFS implementation, including the universal file access layer known as UFO, the smart card authentication and key management module, and the SFS Client and Group Server. 4.1 UFO UFO is a file system extension that provides transparent access to ....

....each of these adds three more file systems which results in code duplication. Using the vfs layer, the interface between the UFO kernel and the individual filesystems can be generalized and file systems can be implemented as separate libraries that can be compiled in seperately if desired. Wrapfs [13] is an implementation of stackable file system layer concept in Linux. It runs as a kernel loadable module and can sit on top of one or more filesystems. Each layer in a vfs (virtual file system) stack has the oportunity to manipulate the data and then pass the data to the next layer in the stack. ....

Erez Zadok and Ion Badulescu. A stackable file system interface for linux. In Proceedings of the 5th Annual Linux Expo, page 141=151, Raleigh, North Carolina, May 1999. 9

....Cloaking is a feature that is useful not just for NFS but for all file systems. We plan on moving our cloaking code to the Virtual File System (VFS) 6, 15] This way, 12 cloaking features could be used with other native file systems such as EXT2FS on local hosts, or with stackable file systems [3, 20, 27, 28, 30], as well as NFS and other network based file systems. We plan to explore methods to improve the performance of cloaking. To improve cloaking performance, we have to allow multi user NFS clients to cache files. However, the VFS s directory cache is not aware of which users are looking up entries ....

E. Zadok and I. Badulescu. A stackable file system interface for Linux. In LinuxExpo Conference Proceedings, pages 141--151, May 1999.

....to write the correct index file and we do so. 6 SCA Implementation Our SCA support was integrated into FiST [29, 25] The FiST system includes portable stackable file system templates for several operating systems as well as a highlevel language that can describe new stackable file systems [26, 28]. Most of the work was put into the stackable templates, where we added substantially more code to support SCAs: 2119 non comment lines of C code, representing a 60 increase in the size of the templates. Because this additional code is substantial and carries an overhead with it that is not ....

E. Zadok and I. Badulescu. A Stackable File System Interface for Linux. LinuxExpo Conference Proceedings, 1999.

....savings and recoverability of the index file. 2.3.3 Portability Our system is based on our Wrapfs templates. The templates provide stacking functionality for a given operating system. While the implementation of each template is different, they all provide a unified API for developers[29, 31]. If developers want to, say, modify file data in a consistent manner, they only need to write two routines: encode data and decode data. One routine is used to encode data pages, and another is used to decode data pages. We changed the templates to support SCAs without changing the encoding and ....

E. Zadok and I. Badulescu. A Stackable File System Interface for Linux. LinuxExpo Conf. Proc., 1999.

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E. Zadok and I. Badulescu. A stackable file system interface for Linux. In LinuxExpo 99, May 1999.

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E. Zadok and I. Badulescu. A stackable file system interface for Linux. In LinuxExpo 99, May 1999.

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