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diff --git a/web/xv6-disk.html b/web/xv6-disk.html deleted file mode 100644 index 65bcf8f..0000000 --- a/web/xv6-disk.html +++ /dev/null @@ -1,63 +0,0 @@ -<html> -<head> -<title>Homework: Files and Disk I/O</title> -</head> -<body> - -<h1>Homework: Files and Disk I/O</h1> - -<p> -<b>Read</b>: bio.c, fd.c, fs.c, and ide.c - -<p> -This homework should be turned in at the beginning of lecture. - -<p> -<b>File and Disk I/O</b> - -<p>Insert a print statement in bwrite so that you get a -print every time a block is written to disk: - -<pre> - cprintf("bwrite sector %d\n", sector); -</pre> - -<p>Build and boot a new kernel and run these three commands at the shell: -<pre> - echo >a - echo >a - rm a - mkdir d -</pre> - -(You can try <tt>rm d</tt> if you are curious, but it should look -almost identical to <tt>rm a</tt>.) - -<p>You should see a sequence of bwrite prints after running each command. -Record the list and annotate it with the calling function and -what block is being written. -For example, this is the <i>second</i> <tt>echo >a</tt>: - -<pre> -$ echo >a -bwrite sector 121 # writei (data block) -bwrite sector 3 # iupdate (inode block) -$ -</pre> - -<p>Hint: the easiest way to get the name of the -calling function is to add a string argument to bwrite, -edit all the calls to bwrite to pass the name of the -calling function, and just print it. -You should be able to reason about what kind of -block is being written just from the calling function. - -<p>You need not write the following up, but try to -understand why each write is happening. This will -help your understanding of the file system layout -and the code. - -<p> -<b>This completes the homework.</b> - -</body> |