Re: XFS_ERROR use - was Re: [PATCH] prevent NULL returns from d_obtain_alias

[Eric Sandeen <sandeen@sandeen.net>]

Dave Chinner wrote:
> On Fri, Oct 17, 2008 at 11:11:00AM +1100, Timothy Shimmin wrote:
>> Fair enough.
>> But XFS_ERROR is used throughout the function.
>> I've found the whole idea of when and when not to use XFS_ERROR annoying :)
>>
>> I've never used it (other than calling it to stay consistent with the code).
>> Looking at the code, it is used to BUG and print a msg on particular error codes set in xfs_etrap[] -
>> and it does this in xfs_error_trap().
>> Can one not decide to do this at any error point?
>> I can't see where we hook in to set up xfs_etrap.
> 
> You break into the debugger, modify the xfs_etrap array to contain
> the set of errors you want to catch, then continue onwards.

bleah :)

Could these just be turned into tracepoints eventually?  Or maybe for
now allow modifying the array via proc or something... would be easier
to ask a user to do that if you don't have direct access to their kdb
console ;)  It is a handy thing to have, though.

-Eric