From atomlin at redhat.com  Sun Jan  1 13:54:45 2012
From: atomlin at redhat.com (Aaron Tomlin)
Date: Sun, 01 Jan 2012 13:54:45 +0000
Subject: Trace ACL updates to an ext3 inode
Message-ID: <4F0065A5.8090500@redhat.com>

I am trying to record all ACL related updates to a particular inode on
an ext3 file system.

*Question:*

  * Is ext3_set_acl() the best entry point to trace from?


I wrote the following trivial system tap script, in an attempt to
capture this information:

#!/usr/bin/stap
/*
* Aggregate calls to ext3_set_acl() for a particular inode number
* Purpose:
*  - Track ACL modifications to an ext3 inode
*/
global check_count;
global inode_num = 0;

probe module("ext3").function("ext3_set_acl") {
        inode_num = $1;
        if ($inode->i_ino == $1) {
                printf ("execname: %s, pid: %d, inode num: %d\n",
execname(), pid(), $inode->i_ino);
                /*check_count++; */
                check_count[execname()] <<< 1;
        }
}

probe end {
                printf ("Calls to ext3_set_acl():\n");
        foreach ([exec] in check_count-) {
                printf ("%s operated %d times on inode %d\n", exec,
@count(check_count[exec]), inode_num);
        }
        delete check_count;
        delete inode_num;
}

Thanks in advance,

-- 
Aaron Tomlin

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