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nfsd4.1: fix session memory use calculation

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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>
This commit is contained in:
J. Bruce Fields 2009-10-21 17:54:13 -04:00
parent dc7a08166f
commit dd829c4564
1 changed files with 4 additions and 1 deletions
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5
fs/nfsd/nfs4state.c
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@ -629,10 +629,13 @@ void
free_session(struct kref *kref)
{
struct nfsd4_session *ses;
int mem;
ses = container_of(kref, struct nfsd4_session, se_ref);
spin_lock(&nfsd_drc_lock);
nfsd_drc_mem_used -= ses->se_fchannel.maxreqs * NFSD_SLOT_CACHE_SIZE;
mem = ses->se_fchannel.maxreqs
* (ses->se_fchannel.maxresp_cached - NFSD_MIN_HDR_SEQ_SZ);
nfsd_drc_mem_used -= mem;
spin_unlock(&nfsd_drc_lock);
free_session_slots(ses);
kfree(ses);