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We assume that a valid file system is already there in Is false, the file system is opened from the disk (i.e., The file system should be created from scratch. The mksfs() has a fresh flag to signal that Mksfs(int fresh) Formats the virtual disk implemented by the disk emulator and creates an instance of the simple file system The following table descibes how these functions are supposed to behave Listing 1: Function names for your C code(you will implement this) The following are the API functions you will implement:Ġ void mksfs(int fresh) // creates the file systemġ int sfs_getnextfilename(char *fname) // get the name of the next file in directoryĢ int sfs_getfilesize(const char* path) // get the size of the given fileģ int sfs_fopen(char *name) // opens the given fileĤ void sfs_fclose(int fileID) // closes the given fileĥ void sfs_fwrite(int fileID, char *buf, int length) // write buf characters into diskĦ void sfs_fread(int fileID, char *buf, int length) // read characters from disk into bufferħ void sfs_fseek(int fileID, int loc) // seek to the location from beginningĨ int sfs_remove(char *file) // removes a file from the filesystem We will give you the API function names and you will have to fill them. This means your Cįile will be an API for the test files. Structure and number of bytes spent on meta data storage depends on the file system design, which is theĪs mentioned earlier, the test files we will give you will be calling your C file functions. In addition to holding the actual file and directory data, we need to store auxiliary data (meta data) thatĭescribes the files and directories in the disk (refer to File attributes section in the lecture notes).
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The number of sectors times the size of a sector gives the total size of the disk. To mimic the real disk, the CCdisk is divided into sectors of fixed size. Therefore, the data you store in the CCdisk is persistent across program The CCdisk is implementedĪs a file on the actual file system. You can randomly access any given sector for reading or writing. It can be considered as an array of sectors (blocks ofįixed size). Space that is separate from your computer disk space.
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The disk emulator given to you provides a constant-cost disk (CCdisk). You are expected to implement the yellow colored module. The gray colored modules in the above schematic are provided by the Linux OS. Schematic that illustrates the overall concept of the mountable simple file system. Your file system is implemented over an emulated disk system, which is provided to you. In fact, through the test files, you will be able to get a sense of what your final To implement as many helper functions and other C files as you wish (just make sure you edit your Makefile The testĬode will call functions inside your C file, so please don’t change the main function names. This is because will also provide you with test files to test your code.
Ccdisk tutorial code#
We will provide you with supporting files that include the code structure of solving the assignment.
Ccdisk tutorial free#
You will implement bit map to keep track of free data blocks and find a free data block before.Single level directory, so there will not be subdirectories (only a single root directory).So in total your file name can have 20 characters (16 charactersįor name, 1 character for the ”.” period, and finally 3 characters for the extension such as ”txt”) The following are the restrictions you will put on your code (this will also help you in coding and simplify Highly useable for embedded applications. Even with the said restrictions, the file system you are implementing is However, such restrictions should be reasonable to not oversimplify the implementation and shouldīe documented in your submission.
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You could introduce additional restrictions in yourĭesign. The SFS introduces many limitations such as restricted filename lengths, no user concept, no protectionĪmong files, no support for concurrent access, etc. It on a macOS and trying to run it on Linux later.Ģ Some specifications to simplify your life We will provide you will only be functional on Linux. This assignment along with the supporting files In this assignment, you are expected to design and implement a simple file system (SFS) that can be mountedīy the user under a directory in the users machine.