NFSv4.1: purge deviceid cache on nfs_free_client

Use the pnfs_layoutdriver_type both as a qualifier for the deviceid,
distinguishing deviceid from different layout types on the server,
and for freeing the layout-driver allocated structure containing the
nfs4_deviceid_node.

[BUG in _deviceid_purge_client]
[layout_driver MUST set free_deviceid_node if using dev-cache]
[let ver < 4.1 compile]
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
[removed EXPORT_SYMBOL_GPL(nfs4_deviceid_purge_client)]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 3831ad04a231..80a5d0e2cc43 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -65,6 +65,8 @@ enum {
         NFS_LAYOUT_DESTROYED,           /* no new use of layout allowed */
 };
 
+struct nfs4_deviceid_node;
+
 /* Per-layout driver specific registration structure */
 struct pnfs_layoutdriver_type {
         struct list_head pnfs_tblid;
@@ -90,6 +92,8 @@ struct pnfs_layoutdriver_type {
          */
         enum pnfs_try_status (*read_pagelist) (struct nfs_read_data *nfs_data);
         enum pnfs_try_status (*write_pagelist) (struct nfs_write_data *nfs_data, int how);
+
+        void (*free_deviceid_node) (struct nfs4_deviceid_node *);
 };
 
 struct pnfs_layout_hdr {
@@ -160,6 +164,7 @@ int pnfs_layoutcommit_inode(struct inode *inode, bool sync);
 /* pnfs_dev.c */
 struct nfs4_deviceid_node {
         struct hlist_node               node;
+        const struct pnfs_layoutdriver_type *ld;
         const struct nfs_client         *nfs_client;
         struct nfs4_deviceid            deviceid;
         atomic_t                        ref;
@@ -169,10 +174,12 @@ void nfs4_print_deviceid(const struct nfs4_deviceid *dev_id);
 struct nfs4_deviceid_node *nfs4_find_get_deviceid(const struct nfs_client *, const struct nfs4_deviceid *);
 struct nfs4_deviceid_node *nfs4_unhash_put_deviceid(const struct nfs_client *, const struct nfs4_deviceid *);
 void nfs4_init_deviceid_node(struct nfs4_deviceid_node *,
+                             const struct pnfs_layoutdriver_type *,
                              const struct nfs_client *,
                              const struct nfs4_deviceid *);
 struct nfs4_deviceid_node *nfs4_insert_deviceid_node(struct nfs4_deviceid_node *);
 bool nfs4_put_deviceid_node(struct nfs4_deviceid_node *);
+void nfs4_deviceid_purge_client(const struct nfs_client *);
 
 static inline int lo_fail_bit(u32 iomode)
 {
@@ -349,6 +356,10 @@ static inline int pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 {
         return 0;
 }
+
+static inline void nfs4_deviceid_purge_client(struct nfs_client *ncl)
+{
+}
 #endif /* CONFIG_NFS_V4_1 */
 
 #endif /* FS_NFS_PNFS_H */