Class NfsWriteRequest

java.lang.Object

com.emc.ecs.nfsclient.rpc.RpcRequest

com.emc.ecs.nfsclient.nfs.NfsRequestBase

com.emc.ecs.nfsclient.nfs.NfsWriteRequest

All Implemented Interfaces:

NfsRequest

Direct Known Subclasses:

Nfs3WriteRequest

public class NfsWriteRequest
extends NfsRequestBase

The request, as specified by RFC 1813 (https://tools.ietf.org/html/rfc1813).

Procedure WRITE writes data to a file.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DATA_SYNC	The server must commit all of the data to stable storage and enough of the metadata to retrieve the data before returning.
static final int	FILE_SYNC	The server must commit the data written plus all file system metadata to stable storage before returning results.
static final int	UNSTABLE	The server is free to commit any part of the data and the metadata to stable storage, including all or none, before returning a reply to the client.

Fields inherited from class RpcRequest

CHARSET

Constructor Summary

Constructors

Constructor	Description
NfsWriteRequest(byte[] fileHandle, long offset, List<ByteBuffer> payload, int syncType, Credential credential, int nfsVersion)	Creates the request, as specified by RFC 1813 (https://tools.ietf.org/html/rfc1813).

Method Summary

Modifier and Type	Method	Description
int	getSize()	Returns the number of bytes of data to be written (calculated from the payload).
boolean	isSync()	Returns true if data is synced false if it is not.
void	marshalling(Xdr xdr)	Writes the RPC call header and authentication credentials to the XDR buffer.
String	toString()

Methods inherited from class NfsRequestBase

getErrorMessage, getFileHandle, getIpKey, startToString

Methods inherited from class RpcRequest

cloneFileHandle, isUsePrivilegedPort, setUsePrivilegedPort, trimFileName

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

UNSTABLE

public static final int UNSTABLE

The server is free to commit any part of the data and the metadata to stable storage, including all or none, before returning a reply to the client.

See Also:

• Constant Field Values

DATA_SYNC

public static final int DATA_SYNC

The server must commit all of the data to stable storage and enough of the metadata to retrieve the data before returning.

See Also:

• Constant Field Values

FILE_SYNC

public static final int FILE_SYNC

The server must commit the data written plus all file system metadata to stable storage before returning results.

See Also:

• Constant Field Values

Constructor Details

NfsWriteRequest

public NfsWriteRequest(byte[] fileHandle,
 long offset,
 List<ByteBuffer> payload,
 int syncType,
 Credential credential,
 int nfsVersion)
                throws FileNotFoundException

Creates the request, as specified by RFC 1813 (https://tools.ietf.org/html/rfc1813).

Procedure WRITE writes data to a file.

Parameters:

fileHandle - The file handle for the file to which data is to be written. This must identify a file system object of type, NF3REG.

offset - The position within the file at which the write is to begin. An offset of 0 means to write data starting at the beginning of the file.

payload - The data to be written to the file.

syncType - One of the values below.

• UNSTABLE = 0 - Best effort, no promises.
• DATA_SYNC = 1 - Commit all data to stable storage, plus enough metadata for retrieval, before returning.
• FILE_SYNC = 2 - Commit all data and metadata to stable storage before returning.

credential - The credential used for RPC authentication.

nfsVersion - The NFS version number

Throws:

FileNotFoundException

Method Details

marshalling

public void marshalling(Xdr xdr)

Writes the RPC call header and authentication credentials to the XDR buffer.

Specified by:

marshalling in interface NfsRequest

Overrides:

marshalling in class NfsRequestBase

Parameters:

xdr - the Xdr to be sent.

toString

public String toString()

Overrides:

toString in class Object

getSize

public int getSize()

Returns the number of bytes of data to be written (calculated from the payload). If size is 0, the WRITE will succeed and return a count of 0, barring errors due to permissions checking. The size of data must be less than or equal to the value of the wtmax field in the FSINFO reply structure for the file system that contains file. If greater, the server may write only wtmax bytes, resulting in a short write.

isSync

public boolean isSync()

Returns

• true if data is synced
• false if it is not.

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