nfsd41: use globals for DRC limits
The version 4.1 DRC memory limit and tracking variables are server wide and
session specific. Replace struct svc_serv fields with globals.
Stop using the svc_serv sv_lock.
Add a spinlock to serialize access to the DRC limit management variables which
change on session creation and deletion (usage counter) or (future)
administrative action to adjust the total DRC memory limit.
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 980a216..2e6a44e 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -430,11 +430,11 @@
else if (fchan->maxreqs > NFSD_MAX_SLOTS_PER_SESSION)
fchan->maxreqs = NFSD_MAX_SLOTS_PER_SESSION;
- spin_lock(&nfsd_serv->sv_lock);
- if (np + nfsd_serv->sv_drc_pages_used > nfsd_serv->sv_drc_max_pages)
- np = nfsd_serv->sv_drc_max_pages - nfsd_serv->sv_drc_pages_used;
- nfsd_serv->sv_drc_pages_used += np;
- spin_unlock(&nfsd_serv->sv_lock);
+ spin_lock(&nfsd_drc_lock);
+ if (np + nfsd_drc_pages_used > nfsd_drc_max_pages)
+ np = nfsd_drc_max_pages - nfsd_drc_pages_used;
+ nfsd_drc_pages_used += np;
+ spin_unlock(&nfsd_drc_lock);
if (np <= 0) {
status = nfserr_resource;