btrfs: switch extent_buffer blocking_writers from atomic to int
The blocking_writers is either 0 or 1 and always updated under the lock, so we don't need the atomic_t semantics. Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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38e9372e
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