Messages in this thread | | | Date | Tue, 10 Apr 2001 13:12:02 -0700 | From | Rajagopal Ananthanarayanan <> | Subject | BH_Req question |
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Hi,
It seems BH_Req is set on a buffer_head by submit_bh. What part of the code unsets this flag during normal operations? One path seems to be block_flushpage->unmap_buffer ->clear_bit(BH_Req), but IIRC block_flushpage is used only for truncates. There must be another path to unset BH_Req under normal memory pressure, or (more unambiguously) on IO completion.
So: in what ways can BH_Req be unset?
Thanks for any input, i've been staring at the code for long without avail ...
cheers,
ananth.
PS: In case why the question: I've got a system with tons of pages with buffers marked BH_Req, so try_to_free_buffers() bails out thinking that the buffer is busy ...
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