nfsd4.1: fix session memory use calculation
Unbalanced calculations on creation and destruction of sessions could cause our estimate of cache memory used to become negative, sometimes resulting in spurious SERVERFAULT returns to client CREATE_SESSION requests. Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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@ -629,10 +629,13 @@ void
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free_session(struct kref *kref)
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{
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struct nfsd4_session *ses;
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int mem;
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ses = container_of(kref, struct nfsd4_session, se_ref);
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spin_lock(&nfsd_drc_lock);
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nfsd_drc_mem_used -= ses->se_fchannel.maxreqs * NFSD_SLOT_CACHE_SIZE;
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mem = ses->se_fchannel.maxreqs
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* (ses->se_fchannel.maxresp_cached - NFSD_MIN_HDR_SEQ_SZ);
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nfsd_drc_mem_used -= mem;
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spin_unlock(&nfsd_drc_lock);
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free_session_slots(ses);
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kfree(ses);
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