/*------------------------------------------------------------------------
* lfsControl - Provide control functions for a local file system
*------------------------------------------------------------------------
*/
devcall lfsControl (
struct dentry *devptr,
int32 func, /* a control function */
int32 arg1, /* argument #1 */
int32 arg2 /* argument #2 */
)
{
int retval;
switch(func)
{
case LF_CTL_FORMAT:
{
retval= lfscreate(LF_DISK_DEV,arg1,arg2);
return retval;
}
case LF_CTL_MKDIR:
{
retval = mkDir((char*)arg1);
return retval;
}
case LF_CTL_RMDIR:
{
retval = rmDir((char*)arg1);
return retval;
}
case LF_CTL_DEL:
{
retval = rmFile((char*)arg1);
return retval;
}
default:
return SYSERR;
}
return OK;
}
int main(int argc, char **argv)
{
char wbuff[] = {"While disks provide a convenient means of permanent storage, they support only a simple and limited naming mechanism of the data they hold (the block number). File systems are used to overcoming this limitation by providing a more elaborate and useful naming mechanism for the data blocks on a disk. This original Xinu File System is a mini-file system with an elegant design that has a limited numbers of files, short file names, and no hierarchical directory structure; however, it allows files to grow dynamically. \r\nThe objective of this lab is to enhance the existing file system for Xinu. You will extend the functionality of the Xinu File System on top of the remote disk abstraction. You are going to transform the current flat file system into a new file system with hierarchical directory structure. \r\n"};
int32 wbufflen = sizeof( wbuff );
char rbuff[ wbufflen * 10 ];
int32 rbufflen = sizeof( rbuff );
int32 retval;
int32 fd[5];
int32 i, j;
kprintf("Open remote disk\r\n");
retval = open(RDISK,"XinuDisk","rw");
if (retval == SYSERR){
panic("Error: could not open the remote disk, check the server\n\r");
}
kprintf("Initializing file system\r\n");
retval = lfscreate ( RDISK, 1000, 1024000);
if( retval == SYSERR )
panic("Initialize file system failed");
kprintf("\r\nList root directory:\r\n");
retval = lflistdirh( LFILESYS, "/" ); //list root dir
if( retval == SYSERR )
kprintf("Listing failed\r\n");
// Create 5 directories
char dirname [] = {"/DIR_1"};
kprintf("\r\n");
for( i=0; i<5; i++){
dirname[5] = '1'+i;
kprintf("Creating directory %s", dirname );
retval = control(LFILESYS, LF_CTL_MKDIR, (int)dirname, 0);
if( retval == SYSERR )
kprintf("....failed");
kprintf("\r\n");
}
//Open a file in each directory
char filename [] = {"/DIR_1/file"};
kprintf("\r\n");
for( i=0; i<5; i++)
{
filename[5] = '1'+i;
kprintf("Opening file at %s\r\n", filename);
fd[i] = open(LFILESYS, filename, "rwn");
kprintf(" Got the sudo device : %d \r\n", fd[i]);
}
// Write to first file
kprintf("\r\nWriting %d characters to /DIR_1/file .... ", wbufflen );
retval = write( fd[0], wbuff, wbufflen );
if( retval == SYSERR )
kprintf("Write failed \r\b");
else
kprintf("Write returned %d \r\n", retval );
// Write to last file
kprintf("\r\nWriting %d characters to /DIR_5/file \r\n", wbufflen*10 );
int total = 0;
for( i=0; i<10; i++ ){
retval = write( fd[4], wbuff, wbufflen );
if( retval == SYSERR )
kprintf("Write failed \r\b");
else {
kprintf("Write returned %d \r\n", retval );
total += retval;
}
}
if( total != 0 )
kprintf("Wrote a total of %d characters\r\n", total );
//Go to the beginning of the file at /DIR_5/file
seek(fd[4],0);
//Read
int wrong = 0;
kprintf("\r\nReading %d characters.... ", rbufflen);
retval = read( fd[4], rbuff, rbufflen );
if( retval == SYSERR )
kprintf("Read failed \r\n");
else{
kprintf("Read returned %d\r\n", retval );
//check the words read
for (j=0,i=0; j<retval; j++,i++)
{
i = i % wbufflen;
if(rbuff[j]!=wbuff[i]){
wrong ++;
kprintf("read wrong at i: %d (expect %c, got %c)\r\n", j, wbuff[i], rbuff[j]);
}
if( wrong >= 20 ) break; //stops printing after 20 characters wrong
}
if( wrong == 0)
kprintf("Congrats. Characters read matches characters wrote.\r\n");
}
//close all files
kprintf("\r\nClosing all files \r\n");
for( i=0; i<5; i++ ){
retval = close( fd[i] );
if( retval == SYSERR )
kprintf("Close file /DIR_%d/file failed \r\n", i+1);
}
//list files
kprintf("\r\nList root directory:\r\n");
retval = lflistdirh( LFILESYS, "/" );
if( SYSERR == retval )
kprintf(" Listing failed\r\n");
for( i=0; i<5; i++ ){
dirname[5] = '1'+i;
kprintf("\r\nList directory %s:\r\n", dirname);
retval = lflistdirh( LFILESYS, dirname );
if( SYSERR == retval )
kprintf(" Listing failed\r\n");
}
return OK;
}