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

[Alex Tomas]

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.