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From: "jeffliu.js.1999 at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug runtime/29388] New: Support using systemtap with overlayfs
Date: Wed, 20 Jul 2022 01:41:06 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29388

            Bug ID: 29388
           Summary: Support using systemtap with overlayfs
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: jeffliu.js.1999 at gmail dot com
  Target Milestone: ---

When using systemtap with overlay filesystem, we need to get real inode and
pass it into uprobe_register function. Otherwise, there will be an inode er=
ror.
To fix the problem, we need to modify 4 places in runtime/linux/uprobes-ino=
de.c
file to let systemtap get the real inode value. The following is the way to
support this feature.

733c733
---                     inode =3D vm_file->f_path.dentry->d_inode;
+++                     inode =3D d_real_inode(vm_file->f_path.dentry);
915c915
---     p->inode =3D dentry->d_inode;
+++     p->inode =3D d_real_inode(dentry);
928c928
---                          offset, vm_flags, dentry->d_inode);
+++                          offset, vm_flags, d_real_inode(dentry));
938c938
---   rc =3D stapiu_change_semaphore_plus(c, task, addr, dentry->d_inode);
+++   rc =3D stapiu_change_semaphore_plus(c, task, addr, d_real_inode(dentr=
y));

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