bcache: bugfix for race between moving_gc and bucket_invalidate
There is a possibility for a bucket to be invalidated by the allocator while moving_gc was copying it's contents to another bucket, if the bucket only held cached data. To prevent this moving checks for a stale ptr (to an invalidated bucket), before and after reads. It it finds one, it simply ignores moving that data. This only affects bcache if the moving_gc was turned on, note that it's off by default. Signed-off-by:Nicholas Swenson <nks@daterainc.com> Signed-off-by:
Kent Overstreet <kmo@daterainc.com>
parent
bf0a628a
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