NFSv4.1: Optimise layout return-on-close
Optimise the layout return on close code by ensuring that
1) Add a check for whether we hold a layout before taking any spinlocks
2) Only take the spin lock once
3) Use nfs_state->state to speed up open file checks
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 9ae5b76..a98d8fd 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -275,6 +275,11 @@
bool nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node);
void nfs4_deviceid_purge_client(const struct nfs_client *);
+static inline bool nfs_have_layout(struct inode *inode)
+{
+ return NFS_I(inode)->layout != NULL;
+}
+
static inline struct nfs4_deviceid_node *
nfs4_get_deviceid(struct nfs4_deviceid_node *d)
{
@@ -427,6 +432,11 @@
#endif /* NFS_DEBUG */
#else /* CONFIG_NFS_V4_1 */
+static inline bool nfs_have_layout(struct inode *inode)
+{
+ return false;
+}
+
static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
{
}