This has been done using a kernel module under 2.2.13:
After modifying sys_open() by prepending a namei(filename),
all devices mounted while the modified sys_open is in place,
report an EBUSY when trying to umount them. Doesn't matter if sys_open
has been restored to the original before umount.
Code snipped: (remaining code is like in syscall.c from LKMPG 1.1.0)
asmlinkage int my_sys_open(const char *filename, int flags, int mode)
{
struct dentry *d_entry=NULL;
lock_kernel();
d_entry=namei(filename);
unlock_kernel();
if (IS_ERR(d_entry))
return orig_sys_open(filename, flags, mode);
if (d_entry->d_inode)
printk("<1> device=%d\n",MAJOR(d_entry->d_inode->i_dev));
return orig_sys_open(filename, flags, mode);
}
I would be very grateful if someone could point out to me where the
problem is - and tell me how to solve it :-)
Sorry if this is a really stupid question - but I couldn't find any
relevant
information myself.
Thank you
Stefan
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