Re: [Ext2-devel] [RFC] probably bug in current ext3/jbd

From: Alex Tomas (bzzz@tmi.comex.ru)
Date: Tue May 20 2003 - 11:06:19 EST


hmm.
looks Andrew Morton should return BKL in ext3_get_block_handle() in -mm tree?
this BKL protects ext3_alloc_branch() -> ext3_alloc_block() -> ext3_new_block()
call chain. or we may implement new protection schema where each jh has some
reference alike 'used by transaction N'

Andrew?

>>>>> Stephen C Tweedie (SCT) writes:

 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.

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