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Pure Java NFSv3 and NFSv4.2 implementation

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dCache/nfs4j

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The pure java implementation of NFS server version 3, 4.0 and 4.1 including pNFS extensionwith nfs4.1-files and flex-files layout types.

Latest release

Building from sources

To build nfs4j from source code Java11 and Maven3 are required.

To run benchmarks:

mvn verify -Pbenchmark

Implementing own NFS server

publicclassApp {publicstaticvoidmain(String[]args)throwsException {// create an instance of a filesystem to be exportedVirtualFileSystemvfs =new ....;// create the RPC service which will handle NFS requestsOncRpcSvcnfsSvc =newOncRpcSvcBuilder()                .withPort(2049)                .withTCP()                .withAutoPublish()                .withWorkerThreadIoStrategy()                .build();// specify file with export entriesExportFileexportFile =newExportFile(....);// create NFS v4.1 serverNFSServerV41nfs4 =newNFSServerV41.Builder()                .withExportFile(exportFile)                .withVfs(vfs)                .withOperationFactory(newMDSOperationFactory())                .build();// create NFS v3 and mountd serversNfsServerV3nfs3 =newNfsServerV3(exportFile,vfs);MountServermountd =newMountServer(exportFile,vfs);// register NFS servers at portmap servicenfsSvc.register(newOncRpcProgram(100003,4),nfs4);nfsSvc.register(newOncRpcProgram(100003,3),nfs3);nfsSvc.register(newOncRpcProgram(100005,3),mountd);// start RPC servicenfsSvc.start();System.in.read();    }}

Use NFS4J in your project

<dependency>    <groupId>org.dcache</groupId>    <artifactId>nfs4j-core</artifactId>    <version>0.19.0</version></dependency><repositories>    <repository>        <id>dcache-releases</id>        <name>dCache.ORG maven repository</name>        <url>https://download.dcache.org/nexus/repository/public/</url>        <layout>default</layout>    </repository></repositories>

IMPORTANT WARNINGS

ThoughNFS4J is used by thedCache and other projects in production,the public API is stillunstable and subject to change (indicated by leading zero in theversion number). Thus, should be considered asbeta.

Please consult theAPI changes document when switching between version numbers.The patch level releases are not affected by API changes, of course.

License

licensed underLGPLv2 (or later)

How to contribute

NFS4J uses the linux kernel model where git is not only source repository,but also the way to track contributions and copyrights.

Each submitted patch must have a "Signed-off-by" line. Patches withoutthis line will not be accepted.

The sign-off is a simple line at the end of the explanation for thepatch, which certifies that you wrote it or otherwise have the right topass it on as an open-source patch. The rules are pretty simple: if youcan certify the below:

    Developer's Certificate of Origin 1.1    By making a contribution to this project, I certify that:    (a) The contribution was created in whole or in part by me and I         have the right to submit it under the open source license         indicated in the file; or    (b) The contribution is based upon previous work that, to the best        of my knowledge, is covered under an appropriate open source        license and I have the right under that license to submit that        work with modifications, whether created in whole or in part        by me, under the same open source license (unless I am        permitted to submit under a different license), as indicated        in the file; or    (c) The contribution was provided directly to me by some other        person who certified (a), (b) or (c) and I have not modified        it.    (d) I understand and agree that this project and the contribution        are public and that a record of the contribution (including all        personal information I submit with it, including my sign-off) is        maintained indefinitely and may be redistributed consistent with        this project or the open source license(s) involved.

then you just add a line saying ( git commit -s )

Signed-off-by: Random J Developer <random@developer.example.org>

using your real name (sorry, no pseudonyms or anonymous contributions.)

Contact Us

For help and development related discussions please contact us:dev (@) dcache (.) org

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Pure Java NFSv3 and NFSv4.2 implementation

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