1 Network File System (NFS) a)The remote access model. b)The upload/download model.

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Presentation transcript:

1 Network File System (NFS) a)The remote access model. b)The upload/download model

2 NFS Architecture (2) The basic NFS architecture for UNIX systems.

3 Communication a)Reading data from a file in NFS version 3. b)Reading data using a compound procedure in version 4.

4 Naming (1) Mounting (part of) a remote file system in NFS.

5 Naming (2) Mounting nested directories from multiple servers in NFS.

6 Automounting (1) A simple automounter for NFS.

7 Automounting (2) Using symbolic links with automounting.

8 Semantics of File Sharing (1) a)On a single processor, when a read follows a write, the value returned by the read is the value just written. b)In a distributed system with caching, obsolete values may be returned.

9 Semantics of File Sharing (2) Four ways of dealing with the shared files in a distributed system. MethodComment UNIX semantics Every operation on a file is instantly visible to all processes Session semantics No changes are visible to other processes until the file is closed Immutable files No updates are possible; simplifies sharing and replication TransactionAll changes occur atomically

10 File Locking in NFS (1) NFS version 4 operations related to file locking. OperationDescription LockCreates a lock for a range of bytes LocktTest whether a conflicting lock has been granted LockuRemove a lock from a range of bytes RenewRenew the leas on a specified lock

11 File Locking in NFS (2) The result of an open operation with share reservations in NFS. a)When the client requests shared access given the current denial state. b)When the client requests a denial state given the current file access state. Current file denial state NONEREADWRITEBOTH READSucceedFailSucceed WRITESucceed FailSucceed BOTHSucceed Fail (a) Requested file denial state NONEREADWRITEBOTH READSucceedFailSucceed WRITESucceed FailSucceed BOTHSucceed Fail (b) Request access Current access state

12 Client Caching (1) Client-side caching in NFS.

13 Client Caching (2) Using the NFS version 4 callback mechanism to recall file delegation.

14 RPC Failures Three situations for handling retransmissions. a)The request is still in progress b)The reply has just been returned c)The reply has been some time ago, but was lost.

15 Security The NFS security architecture.

16 Secure RPCs Secure RPC in NFS version 4.