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/include/linux/nfsd/nfsd.h b/include/linux/nfsd/nfsd.h
index 2b49d67..2571f85 100644
--- a/include/linux/nfsd/nfsd.h
+++ b/include/linux/nfsd/nfsd.h
@@ -56,6 +56,9 @@
extern u32 nfsd_supported_minorversion;
extern struct mutex nfsd_mutex;
extern struct svc_serv *nfsd_serv;
+extern spinlock_t nfsd_drc_lock;
+extern unsigned int nfsd_drc_max_pages;
+extern unsigned int nfsd_drc_pages_used;
extern struct seq_operations nfs_exports_op;
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index ea80096..52e8cb0 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -94,8 +94,6 @@
struct module * sv_module; /* optional module to count when
* adding threads */
svc_thread_fn sv_function; /* main function for threads */
- unsigned int sv_drc_max_pages; /* Total pages for DRC */
- unsigned int sv_drc_pages_used;/* DRC pages used */
#if defined(CONFIG_NFS_V4_1)
struct list_head sv_cb_list; /* queue for callback requests
* that arrive over the same