aha. now it's clear. thank you. I catched J_ASSERT(b_committed_data != NULL)
in ext3_free_blocks() with de-BKL'ed JBD. hence, my solution is to have a
tid journal_head indicating which transaction uses b_committed_data.
I don't want to look intrusive, but .. what do you think about new locking
schema I'm trying to implement?
>>>>> Stephen C Tweedie (SCT) writes:
>> access for
>> b_committed_data == NULL ?
SCT> Not with BKL. Without it, yes, that's definitely a risk, and you need
SCT> some locking for the access to b_committed_data. Without that, even if
SCT> you keep the jh->b_committed_data field valid, you risk freeing the old
SCT> copy that another thread is using.
SCT> Cheers,
SCT> Stephen
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