[Linux-cluster] Re: GFS, what's remaining

[Greg KH]

On Fri, Sep 02, 2005 at 05:44:03PM +0800, David Teigland wrote:
> On Thu, Sep 01, 2005 at 01:35:23PM +0200, Arjan van de Ven wrote:
> 
> > +	gfs2_assert(gl->gl_sbd, atomic_read(&gl->gl_count) > 0,);
> 
> > what is gfs2_assert() about anyway? please just use BUG_ON directly
> > everywhere
> 
> When a machine has many gfs file systems mounted at once it can be useful
> to know which one failed.  Does the following look ok?
> 
> #define gfs2_assert(sdp, assertion)                                       \
> do {                                                                      \
>         if (unlikely(!(assertion))) {                                     \
>                 printk(KERN_ERR                                           \
>                         "GFS2: fsid=%s: fatal: assertion \"%s\" failed\n" \
>                         "GFS2: fsid=%s:   function = %s\n"                \
>                         "GFS2: fsid=%s:   file = %s, line = %u\n"         \
>                         "GFS2: fsid=%s:   time = %lu\n",                  \
>                         sdp->sd_fsname, # assertion,                      \
>                         sdp->sd_fsname,  __FUNCTION__,                    \
>                         sdp->sd_fsname, __FILE__, __LINE__,               \
>                         sdp->sd_fsname, get_seconds());                   \
>                 BUG();                                                    \

You will already get the __FUNCTION__ (and hence the __FILE__ info)
directly from the BUG() dump, as well as the time from the syslog
message (turn on the printk timestamps if you want a more fine grain
timestamp), so the majority of this macro is redundant with the BUG()
macro...

thanks,

greg k-h