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Date: Fri, 18 Sep 2009 11:33:04 -0700 From: Curt Wohlgemuth <curtw@...gle.com> To: Andreas Dilger <adilger@....com> Cc: ext4 development <linux-ext4@...r.kernel.org> Subject: Re: [PATCH 2/2] ext4: Handle nested ext4_journal_start/stop calls without a journal On Thu, Sep 17, 2009 at 10:50 PM, Andreas Dilger <adilger@....com> wrote: > On Sep 17, 2009 14:55 -0700, Curt Wohlgemuth wrote: >> This patch fixes a problem with handling nested calls to >> ext4_journal_start/ext4_journal_stop, when there is no journal present. >> >> Signed-off-by: Curt Wohlgemuth <curtw@...gle.com> >> --- >> >> Instead of using the special value of >> >> (handle_t *)0x1 >> >> to represent a handle when there is no journal present, we now use a real >> handle_t, so we can use its ref counting. The h_transaction field now >> determines if there is a journal present or not. > > You _could_ just use the "handle" value as a refcount, and anything less > than, say, 4096 is considered a "special" handle. I can't imagine the > refcount being more than 3 or 4 even in extreme cases. That's an elegant idea; thanks. I'll work this up and send a patch out for it. Thanks, Curt > > Cheers, Andreas > -- > Andreas Dilger > Sr. Staff Engineer, Lustre Group > Sun Microsystems of Canada, Inc. > > -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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