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<p class="MsoNormal"><span lang="EN-US">As I reviewing the code, there are some of usages I does not understand.</span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US">extern spinlock_t dlm_domain_lock;</span></p>
<p class="MsoNormal" style="text-indent:21.0pt"><span lang="EN-US">extern struct list_head dlm_domains;</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">I think dlm_domain_lock is used to control the access of dlm_domains.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Why not prefer dlm_lock to dlm_domain_lock in the function dlm_try_to_join_domain?</span></p>
<p class="MsoNormal"><span lang="EN-US"> spin_lock(&dlm_domain_lock);</span></p>
<p class="MsoNormal"><span lang="EN-US"> dlm->dlm_state = DLM_CTXT_JOINED;</span></p>
<p class="MsoNormal"><span lang="EN-US"> dlm->num_joins++;</span></p>
<p class="MsoNormal"><span lang="EN-US"> spin_unlock(&dlm_domain_lock);</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
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