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  1. #1

    kernel code not working

    I wrote small code in read_write.c in linux- I am trying to retrieve entire path of some file where read operation is being performed. I changed 'SYSCALL_DEFINE3(read, unsigned int, fd, char __user *, buf, size_t, count)' to call my function 'getEntirePath(file->f_dentry, path, &length)'.
    The definition of getEntirePath is as follows:

    void getEntirePath(struct dentry *self, char *filePath, int *length)
    	int i=0;
    	//int offset;
    	int MAX_PATH_DEPTH=30;
    	char stack[MAX_PATH_DEPTH][40];
    		strcpy(stack[i], self->;
    		printk("swapnil: Dir::%s",stack[i]);		
    		if(i!=0 && stack[i][0]!='/')
    	}while(stack[i++][0]!='/' && i<MAX_PATH_DEPTH);
    This code takes the dentry *self as input parameter and should trace back the path up to '/'.
    This code hangs as soon as I enable it through a driver. Also I want to know from which function I should call this code for getting the entire path of file being read/written? I called it from vfs_write/vfs_read, do_sync_write/do_sync_read, but the function is not getting called each time some file is read/wrote.

    Thanks for help.

  2. #2
    Someone please answer, my project is stuck due to this.

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