NFS: Add a slot table to struct nfs_client for NFSv4.0 transport blocking

Anchor an nfs4_slot_table in the nfs_client for use with NFSv4.0
transport blocking.  It is initialized only for NFSv4.0 nfs_client's.

Introduce appropriate minor version ops to handle nfs_client
initialization and shutdown requirements that differ for each minor
version.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

3 files changed, 86 insertions, 27 deletions

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 8de9b934dcac..af2d5bf043f0 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -38,6 +38,8 @@ struct nfs4_minor_version_ops {
         u32     minor_version;
         unsigned init_caps;
 
+        int     (*init_client)(struct nfs_client *);
+        void    (*shutdown_client)(struct nfs_client *);
         bool    (*match_stateid)(const nfs4_stateid *,
                         const nfs4_stateid *);
         int     (*find_root_sec)(struct nfs_server *, struct nfs_fh *,
@@ -292,6 +294,10 @@ extern const u32 nfs4_pathconf_bitmap[3];
 extern const u32 nfs4_fsinfo_bitmap[3];
 extern const u32 nfs4_fs_locations_bitmap[3];
 
+void nfs40_shutdown_client(struct nfs_client *);
+void nfs41_shutdown_client(struct nfs_client *);
+int nfs40_init_client(struct nfs_client *);
+int nfs41_init_client(struct nfs_client *);
 void nfs4_free_client(struct nfs_client *);
 
 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *);
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 767a5e37fe97..98c0104bb0c4 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -41,7 +41,7 @@ static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
 }
 
 #ifdef CONFIG_NFS_V4_1
-static void nfs4_shutdown_session(struct nfs_client *clp)
+void nfs41_shutdown_client(struct nfs_client *clp)
 {
         if (nfs4_has_session(clp)) {
                 nfs4_destroy_session(clp->cl_session);
@@ -49,11 +49,15 @@ static void nfs4_shutdown_session(struct nfs_client *clp)
         }
 
 }
-#else /* CONFIG_NFS_V4_1 */
-static void nfs4_shutdown_session(struct nfs_client *clp)
+#endif  /* CONFIG_NFS_V4_1 */
+
+void nfs40_shutdown_client(struct nfs_client *clp)
 {
+        if (clp->cl_slot_tbl) {
+                nfs4_release_slot_table(clp->cl_slot_tbl);
+                kfree(clp->cl_slot_tbl);
+        }
 }
-#endif /* CONFIG_NFS_V4_1 */
 
 struct nfs_client *nfs4_alloc_client(const struct nfs_client_initdata *cl_init)
 {
@@ -97,7 +101,7 @@ static void nfs4_shutdown_client(struct nfs_client *clp)
 {
         if (__test_and_clear_bit(NFS_CS_RENEWD, &clp->cl_res_state))
                 nfs4_kill_renewd(clp);
-        nfs4_shutdown_session(clp);
+        clp->cl_mvops->shutdown_client(clp);
         nfs4_destroy_callback(clp);
         if (__test_and_clear_bit(NFS_CS_IDMAP, &clp->cl_res_state))
                 nfs_idmap_delete(clp);
@@ -144,34 +148,77 @@ static int nfs4_init_callback(struct nfs_client *clp)
         return 0;
 }
 
+/**
+ * nfs40_init_client - nfs_client initialization tasks for NFSv4.0
+ * @clp - nfs_client to initialize
+ *
+ * Returns zero on success, or a negative errno if some error occurred.
+ */
+int nfs40_init_client(struct nfs_client *clp)
+{
+        struct nfs4_slot_table *tbl;
+        int ret;
+
+        tbl = kzalloc(sizeof(*tbl), GFP_NOFS);
+        if (tbl == NULL)
+                return -ENOMEM;
+
+        ret = nfs4_setup_slot_table(tbl, NFS4_MAX_SLOT_TABLE,
+                                        "NFSv4.0 transport Slot table");
+        if (ret) {
+                kfree(tbl);
+                return ret;
+        }
+
+        clp->cl_slot_tbl = tbl;
+        return 0;
+}
+
+#if defined(CONFIG_NFS_V4_1)
+
+/**
+ * nfs41_init_client - nfs_client initialization tasks for NFSv4.1+
+ * @clp - nfs_client to initialize
+ *
+ * Returns zero on success, or a negative errno if some error occurred.
+ */
+int nfs41_init_client(struct nfs_client *clp)
+{
+        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;
+
+        /*
+         * The create session reply races with the server back
+         * channel probe. Mark the client NFS_CS_SESSION_INITING
+         * so that the client back channel can find the
+         * nfs_client struct
+         */
+        nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
+        return 0;
+}
+
+#endif  /* CONFIG_NFS_V4_1 */
+
 /*
  * 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_mvops->minor_version) {
-                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;
-                /*
-                 * The create session reply races with the server back
-                 * channel probe. Mark the client NFS_CS_SESSION_INITING
-                 * so that the client back channel can find the
-                 * nfs_client struct
-                 */
-                nfs_mark_client_ready(clp, NFS_CS_SESSION_INITING);
-        }
-#endif /* CONFIG_NFS_V4_1 */
+        int ret;
 
+        ret = clp->cl_mvops->init_client(clp);
+        if (ret)
+                return ret;
         return nfs4_init_callback(clp);
 }
 
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 3abd32caec2f..3b5166c20962 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -7533,6 +7533,8 @@ static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
                 | NFS_CAP_ATOMIC_OPEN
                 | NFS_CAP_CHANGE_ATTR
                 | NFS_CAP_POSIX_LOCK,
+        .init_client = nfs40_init_client,
+        .shutdown_client = nfs40_shutdown_client,
         .match_stateid = nfs4_match_stateid,
         .find_root_sec = nfs4_find_root_sec,
         .free_lock_state = nfs4_release_lockowner,
@@ -7551,6 +7553,8 @@ static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
                 | NFS_CAP_POSIX_LOCK
                 | NFS_CAP_STATEID_NFSV41
                 | NFS_CAP_ATOMIC_OPEN_V1,
+        .init_client = nfs41_init_client,
+        .shutdown_client = nfs41_shutdown_client,
         .match_stateid = nfs41_match_stateid,
         .find_root_sec = nfs41_find_root_sec,
         .free_lock_state = nfs41_free_lock_state,
@@ -7570,6 +7574,8 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
                 | NFS_CAP_POSIX_LOCK
                 | NFS_CAP_STATEID_NFSV41
                 | NFS_CAP_ATOMIC_OPEN_V1,
+        .init_client = nfs41_init_client,
+        .shutdown_client = nfs41_shutdown_client,
         .match_stateid = nfs41_match_stateid,
         .find_root_sec = nfs41_find_root_sec,
         .free_lock_state = nfs41_free_lock_state,