[Cluster-devel] [GFS2 PATCH] GFS2: Log the reason for log flushes in every log header

[Bob Peterson <rpeterso@redhat.com>]

Hi,

----- Original Message -----
| > +	LHF_SHUTDOWN		= 0, 
| Should 0 be used for "unknown"?

Good idea. I'll add that.
(snip)
| > +	/* Constants reserved for user space / gfs2-utils */
| > +	LHF_GFS2_CONVERT       	= 26,
| > +	LHF_GFS2_EDIT		= 27,
| > +	LHF_GFS2_FSCK		= 28,
| > +	LHF_GFS2_FSCK_JREPLAY	= 29,
| > +	LHF_GFS2_MKFS		= 30,
| > +	LHF_GFS2_JADD		= 31
| 
| Would it be better to have values for the purposes that the utils would
| need to touch the log header, e.g. LHF_UTIL_REPLAY, LHF_UTIL_FIX or
| LHF_UTIL_CREATE. That way, if a util is renamed or a new util is written
| (even some third party tool that we don't know about) they would still
| have a sensible value to use.
| 
| Cheers,
| Andy

Actually, yes, I was kind of hoping you would suggest some useful
values for user space. I didn't go over how gfs2-utils works with log
headers because I didn't want to delay posting a prototype further.

I only allocated one 32-bit set of flags, with some space in the middle
carved out for user space, but it seems a bit confining. Obviously this
is still just a prototype, so we can add another 32-bit flag (one for
kernel space and one for user space?) or improve it any other way that
would be useful. I'm open to suggestions.

Regards,

Bob Peterson
Red Hat File Systems