nfsd41: reclaim DRC memory on session free

This fixes a leak which would eventually lock out new clients.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 2e6a44e3d2fe..69bd37e3fdcf 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -585,6 +585,9 @@ free_session(struct kref *kref)
                 struct nfsd4_cache_entry *e = &ses->se_slots[i].sl_cache_entry;
                 nfsd4_release_respages(e->ce_respages, e->ce_resused);
         }
+        spin_lock(&nfsd_drc_lock);
+        nfsd_drc_pages_used -= ses->se_fchannel.maxreqs * NFSD_PAGES_PER_SLOT;
+        spin_unlock(&nfsd_drc_lock);
         kfree(ses);
 }