Network File System (NFS)

Team Members

- Ayan Datta
- Suyash Sethia
- Krishna Singh

Functionality

1. Create

• File and Folder

Client Side (Aditya)

• Create a connection with the NM
• Prompt the user for an action
  • CREATE <file_path>
    • Send Create Request with file / Folder Path
    • recieve response from NM

Overall Implementations :

• Create and Update content of files & folders within the NFS.
• Reading a file.
• Deleting a file / Folder.
• Listing all files / folders from a folder.
• Getting additional information.
• Clients [50]
  • Directory Mounting
  • Reading, Writing, and Retrieving Information about Files
  • Creating and Deleting Files and Folders
  • Copying Files/Directories Between Storage Servers
• Other features
  • Multiple Clients

NM Side (Ayan )

• Recieve Create Request from Client
• For create file, send CREATE request to SS
• If successfull CREATE_BACKUP request to two other SS
• send response 200 to client

SS Side (Suyash)

Initialisation

• Get ssid from commandline

• Check if root folder of ssid exists

  • if not then create
  • if exists get list of all paths

• send register request with all paths, ssid, addresses

• start nm_handler thread and client_handler_thread

• Recieve CREATE request from NM

• Create file in correct Path inside Root

• Send response 200 to NM if successfull

• else send response 500 to NM if unsuccessfull

SS file Structure

SS

• SS_Root_0
  • Files / Folders
• SS_Root_1
  • Files / Folders

Format

Sending a Request

• Include requests.h from Common folder
• Use send_<request_type>_request function

Receiving a Request

• Include requests.h from Common folder
• Create a Request object for receiving request
• Use receive_request function
• Use request_type attribute to discriminate request type and get the corresponding request_content

Sending a Response

• Include responses.h from Common folder
• Use send_response function

Receiving a Response

• Include responses.h from Common folder
• Use receive_response function with pointer to a character.

Request and response format

• Every request is proceeded by a header

Header Format

• Request/Response Type - 1 byte (char)

• Payload Length - 8 bytes (uint64_t)

• After the request, payload follows, whose length is defined by the header.

Eg Create a.txt ->

Header(type='C', length=5) Payload("a.txt")

• Include Headers from Common for functions for sending and receiving commands

Project Description

https://karthikv1392.github.io/cs3301_osn/project/