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Re: What prevents discarding a cluster during rewrite?
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From: |
Vladimir Sementsov-Ogievskiy |
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Subject: |
Re: What prevents discarding a cluster during rewrite? |
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Date: |
Tue, 23 Feb 2021 00:42:42 +0300 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.1 |
23.02.2021 00:30, Vladimir Sementsov-Ogievskiy wrote:
Hi all!
Thinking of how to prevent dereferencing to zero (and discard) of host cluster
during flush of compressed cache (which I'm working on now), I have a
question.. What prevents it for normal writes?
I have no idea about why didn't it fail for years.. May be, I'm missing
something?
I have idea of fixing: increase the refcount of host cluster before write to
data_file (it's important to increase refacount in same s->lock critical
section where we get host_offset) and dereference it after write.. It should help.
Any thoughts?
--
Best regards,
Vladimir