nfs41: sessions client infrastructure

NFSv4.1 Sessions basic data types, initialization, and destruction.

The session is always associated with a struct nfs_client that holds
the exchange_id results.

Signed-off-by: Rahul Iyer <iyer@netapp.com>
Signed-off-by: Andy Adamson<andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[remove extraneous rpc_clnt pointer, use the struct nfs_client cl_rpcclient.
remove the rpc_clnt parameter from nfs4 nfs4_init_session]
Signed-off-by: Andy Adamson<andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Use the presence of a session to determine behaviour instead of the
minorversion number.]
Signed-off-by: Andy Adamson <andros@netapp.com>
[constified nfs4_has_session's struct nfs_client parameter]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Rename nfs4_put_session() to nfs4_destroy_session() and call it from nfs4_free_client() not nfs4_free_server().
Also get rid of nfs4_get_session() and the ref_count in nfs4_session struct as keeping track of nfs_client should be sufficient]
Signed-off-by: Alexandros Batsakis <Alexandros.Batsakis@netapp.com>
[nfs41: pass rsize and wsize into nfs4_init_session]
Signed-off-by: Andy Adamson <andros@netapp.com>
[separated out removal of rpc_clnt parameter from nfs4_init_session ot a
 patch of its own]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Pass the nfs_client pointer into nfs4_alloc_session]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: don't assign to session->clp->cl_session in nfs4_destroy_session]
[nfs41: fixup nfs4_clear_client_minor_version]
[introduce nfs4_clear_client_minor_version() in this patch]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[Refactor nfs4_init_session]
    Moved session allocation into nfs4_init_client_minor_version, called from
    nfs4_init_client.
    Leave rwise and wsize initialization in nfs4_init_session, called from
    nfs4_init_server.
    Reverted moving of nfs_fsid definition to nfs_fs_sb.h
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: Move NFS4_MAX_SLOT_TABLE define from under CONFIG_NFS_V4_1]
[Fix comile error when CONFIG_NFS_V4_1 is not set.]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[moved nfs4_init_slot_table definition to "create_session operation"]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: alloc session with GFP_KERNEL]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 110 insertions, 0 deletions

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index a736160046c3..f1506f148521 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -184,12 +184,27 @@ static void nfs4_shutdown_client(struct nfs_client *clp)
 }
 
 /*
+ * Clears/puts all minor version specific parts from an nfs_client struct
+ * reverting it to minorversion 0.
+ */
+static void nfs4_clear_client_minor_version(struct nfs_client *clp)
+{
+#ifdef CONFIG_NFS_V4_1
+        if (nfs4_has_session(clp)) {
+                nfs4_destroy_session(clp->cl_session);
+                clp->cl_session = NULL;
+        }
+#endif /* CONFIG_NFS_V4_1 */
+}
+
+/*
  * Destroy a shared client record
  */
 static void nfs_free_client(struct nfs_client *clp)
 {
         dprintk("--> nfs_free_client(%u)\n", clp->rpc_ops->version);
 
+        nfs4_clear_client_minor_version(clp);
         nfs4_shutdown_client(clp);
 
         nfs_fscache_release_client_cookie(clp);
@@ -1054,6 +1069,30 @@ error:
 
 #ifdef CONFIG_NFS_V4
 /*
+ * Initialize the minor version specific parts of an NFS4 client record
+ */
+static int nfs4_init_client_minor_version(struct nfs_client *clp)
+{
+#if defined(CONFIG_NFS_V4_1)
+        if (clp->cl_minorversion) {
+                struct nfs4_session *session = NULL;
+                /*
+                 * Create the session and mark it expired.
+                 * When a SEQUENCE operation encounters the expired session
+                 * it will do session recovery to initialize it.
+                 */
+                session = nfs4_alloc_session(clp);
+                if (!session)
+                        return -ENOMEM;
+
+                clp->cl_session = session;
+        }
+#endif /* CONFIG_NFS_V4_1 */
+
+        return 0;
+}
+
+/*
  * Initialise an NFS4 client record
  */
 static int nfs4_init_client(struct nfs_client *clp,
@@ -1087,6 +1126,10 @@ static int nfs4_init_client(struct nfs_client *clp,
         }
         __set_bit(NFS_CS_IDMAP, &clp->cl_res_state);
 
+        error = nfs4_init_client_minor_version(clp);
+        if (error < 0)
+                goto error;
+
         nfs_mark_client_ready(clp, NFS_CS_READY);
         return 0;
 
@@ -1144,6 +1187,21 @@ error:
 }
 
 /*
+ * Initialize a session.
+ * Note: save the mount rsize and wsize for create_server negotiation.
+ */
+static void nfs4_init_session(struct nfs_client *clp,
+                              unsigned int wsize, unsigned int rsize)
+{
+#if defined(CONFIG_NFS_V4_1)
+        if (nfs4_has_session(clp)) {
+                clp->cl_session->fc_attrs.max_rqst_sz = wsize;
+                clp->cl_session->fc_attrs.max_resp_sz = rsize;
+        }
+#endif /* CONFIG_NFS_V4_1 */
+}
+
+/*
  * Create a version 4 volume record
  */
 static int nfs4_init_server(struct nfs_server *server,
@@ -1221,6 +1279,8 @@ struct nfs_server *nfs4_create_server(const struct nfs_parsed_mount_data *data,
         BUG_ON(!server->nfs_client->rpc_ops);
         BUG_ON(!server->nfs_client->rpc_ops->file_inode_ops);
 
+        nfs4_init_session(server->nfs_client, server->wsize, server->rsize);
+
         /* Probe the root fh to retrieve its FSID */
         error = nfs4_path_walk(server, mntfh, data->nfs_server.export_path);
         if (error < 0)
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index ffa6bd54d439..7cef45db9257 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -207,6 +207,18 @@ extern int nfs4_path_walk(struct nfs_server *server,
 #endif
 
 /*
+ * Determine if sessions are in use.
+ */
+static inline int nfs4_has_session(const struct nfs_client *clp)
+{
+#ifdef CONFIG_NFS_V4_1
+        if (clp->cl_session)
+                return 1;
+#endif /* CONFIG_NFS_V4_1 */
+        return 0;
+}
+
+/*
  * Determine the device name as a string
  */
 static inline char *nfs_devname(const struct vfsmount *mnt_parent,
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 84345deab26f..acac6f8c3d39 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -202,6 +202,10 @@ extern int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
 
 extern struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops;
 extern struct nfs4_state_recovery_ops nfs4_nograce_recovery_ops;
+#if defined(CONFIG_NFS_V4_1)
+extern void nfs4_destroy_session(struct nfs4_session *session);
+extern struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp);
+#endif /* CONFIG_NFS_V4_1 */
 
 extern const u32 nfs4_fattr_bitmap[2];
 extern const u32 nfs4_statfs_bitmap[2];
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 4674f8092da8..cdd8e74c47d0 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3723,6 +3723,40 @@ int nfs4_proc_fs_locations(struct inode *dir, const struct qstr *name,
         return status;
 }
 
+#ifdef CONFIG_NFS_V4_1
+/* Destroy the slot table */
+static void nfs4_destroy_slot_table(struct nfs4_session *session)
+{
+        if (session->fc_slot_table.slots == NULL)
+                return;
+        kfree(session->fc_slot_table.slots);
+        session->fc_slot_table.slots = NULL;
+        return;
+}
+
+struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
+{
+        struct nfs4_session *session;
+        struct nfs4_slot_table *tbl;
+
+        session = kzalloc(sizeof(struct nfs4_session), GFP_KERNEL);
+        if (!session)
+                return NULL;
+        tbl = &session->fc_slot_table;
+        spin_lock_init(&tbl->slot_tbl_lock);
+        rpc_init_wait_queue(&tbl->slot_tbl_waitq, "Slot table");
+        session->clp = clp;
+        return session;
+}
+
+void nfs4_destroy_session(struct nfs4_session *session)
+{
+        nfs4_destroy_slot_table(session);
+        kfree(session);
+}
+
+#endif /* CONFIG_NFS_V4_1 */
+
 struct nfs4_state_recovery_ops nfs4_reboot_recovery_ops = {
         .owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
         .state_flag_bit = NFS_STATE_RECLAIM_REBOOT,