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authorAndy Adamson <andros@netapp.com>2009-04-01 09:21:53 -0400
committerBenny Halevy <bhalevy@panasas.com>2009-06-17 10:46:19 -0700
commit557134a39c8d2ab79d8b8d53438e03e29feb5ec4 (patch)
tree3f6999d9601618102413fd535ff95f9be0babd85 /fs/nfs
parent9ff71c3a9827b99699510076dffa0bbe7c36bfd4 (diff)
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>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/client.c60
-rw-r--r--fs/nfs/internal.h12
-rw-r--r--fs/nfs/nfs4_fs.h4
-rw-r--r--fs/nfs/nfs4proc.c34
4 files changed, 110 insertions, 0 deletions
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index a736160046c..f1506f14852 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 ffa6bd54d43..7cef45db925 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 84345deab26..acac6f8c3d3 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 4674f8092da..cdd8e74c47d 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,