--- /dev/null
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * stack_o2cb.c
+ *
+ * Code which interfaces ocfs2 with the o2cb stack.
+ *
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/crc32.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+/* Needed for AOP_TRUNCATED_PAGE in mlog_errno() */
+#include <linux/fs.h>
+
+#include "cluster/masklog.h"
+#include "cluster/nodemanager.h"
+#include "cluster/heartbeat.h"
+#include "cluster/tcp.h"
+
+#include "stackglue.h"
+
+struct o2dlm_private {
+ struct dlm_eviction_cb op_eviction_cb;
+};
+
+static struct ocfs2_stack_plugin o2cb_stack;
+
+/* These should be identical */
+#if (DLM_LOCK_IV != LKM_IVMODE)
+# error Lock modes do not match
+#endif
+#if (DLM_LOCK_NL != LKM_NLMODE)
+# error Lock modes do not match
+#endif
+#if (DLM_LOCK_CR != LKM_CRMODE)
+# error Lock modes do not match
+#endif
+#if (DLM_LOCK_CW != LKM_CWMODE)
+# error Lock modes do not match
+#endif
+#if (DLM_LOCK_PR != LKM_PRMODE)
+# error Lock modes do not match
+#endif
+#if (DLM_LOCK_PW != LKM_PWMODE)
+# error Lock modes do not match
+#endif
+#if (DLM_LOCK_EX != LKM_EXMODE)
+# error Lock modes do not match
+#endif
+static inline int mode_to_o2dlm(int mode)
+{
+ BUG_ON(mode > LKM_MAXMODE);
+
+ return mode;
+}
+
+#define map_flag(_generic, _o2dlm) \
+ if (flags & (_generic)) { \
+ flags &= ~(_generic); \
+ o2dlm_flags |= (_o2dlm); \
+ }
+static int flags_to_o2dlm(u32 flags)
+{
+ int o2dlm_flags = 0;
+
+ map_flag(DLM_LKF_NOQUEUE, LKM_NOQUEUE);
+ map_flag(DLM_LKF_CANCEL, LKM_CANCEL);
+ map_flag(DLM_LKF_CONVERT, LKM_CONVERT);
+ map_flag(DLM_LKF_VALBLK, LKM_VALBLK);
+ map_flag(DLM_LKF_IVVALBLK, LKM_INVVALBLK);
+ map_flag(DLM_LKF_ORPHAN, LKM_ORPHAN);
+ map_flag(DLM_LKF_FORCEUNLOCK, LKM_FORCE);
+ map_flag(DLM_LKF_TIMEOUT, LKM_TIMEOUT);
+ map_flag(DLM_LKF_LOCAL, LKM_LOCAL);
+
+ /* map_flag() should have cleared every flag passed in */
+ BUG_ON(flags != 0);
+
+ return o2dlm_flags;
+}
+#undef map_flag
+
+/*
+ * Map an o2dlm status to standard errno values.
+ *
+ * o2dlm only uses a handful of these, and returns even fewer to the
+ * caller. Still, we try to assign sane values to each error.
+ *
+ * The following value pairs have special meanings to dlmglue, thus
+ * the right hand side needs to stay unique - never duplicate the
+ * mapping elsewhere in the table!
+ *
+ * DLM_NORMAL: 0
+ * DLM_NOTQUEUED: -EAGAIN
+ * DLM_CANCELGRANT: -EBUSY
+ * DLM_CANCEL: -DLM_ECANCEL
+ */
+/* Keep in sync with dlmapi.h */
+static int status_map[] = {
+ [DLM_NORMAL] = 0, /* Success */
+ [DLM_GRANTED] = -EINVAL,
+ [DLM_DENIED] = -EACCES,
+ [DLM_DENIED_NOLOCKS] = -EACCES,
+ [DLM_WORKING] = -EACCES,
+ [DLM_BLOCKED] = -EINVAL,
+ [DLM_BLOCKED_ORPHAN] = -EINVAL,
+ [DLM_DENIED_GRACE_PERIOD] = -EACCES,
+ [DLM_SYSERR] = -ENOMEM, /* It is what it is */
+ [DLM_NOSUPPORT] = -EPROTO,
+ [DLM_CANCELGRANT] = -EBUSY, /* Cancel after grant */
+ [DLM_IVLOCKID] = -EINVAL,
+ [DLM_SYNC] = -EINVAL,
+ [DLM_BADTYPE] = -EINVAL,
+ [DLM_BADRESOURCE] = -EINVAL,
+ [DLM_MAXHANDLES] = -ENOMEM,
+ [DLM_NOCLINFO] = -EINVAL,
+ [DLM_NOLOCKMGR] = -EINVAL,
+ [DLM_NOPURGED] = -EINVAL,
+ [DLM_BADARGS] = -EINVAL,
+ [DLM_VOID] = -EINVAL,
+ [DLM_NOTQUEUED] = -EAGAIN, /* Trylock failed */
+ [DLM_IVBUFLEN] = -EINVAL,
+ [DLM_CVTUNGRANT] = -EPERM,
+ [DLM_BADPARAM] = -EINVAL,
+ [DLM_VALNOTVALID] = -EINVAL,
+ [DLM_REJECTED] = -EPERM,
+ [DLM_ABORT] = -EINVAL,
+ [DLM_CANCEL] = -DLM_ECANCEL, /* Successful cancel */
+ [DLM_IVRESHANDLE] = -EINVAL,
+ [DLM_DEADLOCK] = -EDEADLK,
+ [DLM_DENIED_NOASTS] = -EINVAL,
+ [DLM_FORWARD] = -EINVAL,
+ [DLM_TIMEOUT] = -ETIMEDOUT,
+ [DLM_IVGROUPID] = -EINVAL,
+ [DLM_VERS_CONFLICT] = -EOPNOTSUPP,
+ [DLM_BAD_DEVICE_PATH] = -ENOENT,
+ [DLM_NO_DEVICE_PERMISSION] = -EPERM,
+ [DLM_NO_CONTROL_DEVICE] = -ENOENT,
+ [DLM_RECOVERING] = -ENOTCONN,
+ [DLM_MIGRATING] = -ERESTART,
+ [DLM_MAXSTATS] = -EINVAL,
+};
+
+static int dlm_status_to_errno(enum dlm_status status)
+{
+ BUG_ON(status < 0 || status >= ARRAY_SIZE(status_map));
+
+ return status_map[status];
+}
+
+static void o2dlm_lock_ast_wrapper(void *astarg)
+{
+ struct ocfs2_dlm_lksb *lksb = astarg;
+
+ lksb->lksb_conn->cc_proto->lp_lock_ast(lksb);
+}
+
+static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
+{
+ struct ocfs2_dlm_lksb *lksb = astarg;
+
+ lksb->lksb_conn->cc_proto->lp_blocking_ast(lksb, level);
+}
+
+static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
+{
+ struct ocfs2_dlm_lksb *lksb = astarg;
+ int error = dlm_status_to_errno(status);
+
+ /*
+ * In o2dlm, you can get both the lock_ast() for the lock being
+ * granted and the unlock_ast() for the CANCEL failing. A
+ * successful cancel sends DLM_NORMAL here. If the
+ * lock grant happened before the cancel arrived, you get
+ * DLM_CANCELGRANT.
+ *
+ * There's no need for the double-ast. If we see DLM_CANCELGRANT,
+ * we just ignore it. We expect the lock_ast() to handle the
+ * granted lock.
+ */
+ if (status == DLM_CANCELGRANT)
+ return;
+
+ lksb->lksb_conn->cc_proto->lp_unlock_ast(lksb, error);
+}
+
+static int o2cb_dlm_lock(struct ocfs2_cluster_connection *conn,
+ int mode,
+ struct ocfs2_dlm_lksb *lksb,
+ u32 flags,
+ void *name,
+ unsigned int namelen)
+{
+ enum dlm_status status;
+ int o2dlm_mode = mode_to_o2dlm(mode);
+ int o2dlm_flags = flags_to_o2dlm(flags);
+ int ret;
+
+ status = dlmlock(conn->cc_lockspace, o2dlm_mode, &lksb->lksb_o2dlm,
+ o2dlm_flags, name, namelen,
+ o2dlm_lock_ast_wrapper, lksb,
+ o2dlm_blocking_ast_wrapper);
+ ret = dlm_status_to_errno(status);
+ return ret;
+}
+
+static int o2cb_dlm_unlock(struct ocfs2_cluster_connection *conn,
+ struct ocfs2_dlm_lksb *lksb,
+ u32 flags)
+{
+ enum dlm_status status;
+ int o2dlm_flags = flags_to_o2dlm(flags);
+ int ret;
+
+ status = dlmunlock(conn->cc_lockspace, &lksb->lksb_o2dlm,
+ o2dlm_flags, o2dlm_unlock_ast_wrapper, lksb);
+ ret = dlm_status_to_errno(status);
+ return ret;
+}
+
+static int o2cb_dlm_lock_status(struct ocfs2_dlm_lksb *lksb)
+{
+ return dlm_status_to_errno(lksb->lksb_o2dlm.status);
+}
+
+/*
+ * o2dlm aways has a "valid" LVB. If the dlm loses track of the LVB
+ * contents, it will zero out the LVB. Thus the caller can always trust
+ * the contents.
+ */
+static int o2cb_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb)
+{
+ return 1;
+}
+
+static void *o2cb_dlm_lvb(struct ocfs2_dlm_lksb *lksb)
+{
+ return (void *)(lksb->lksb_o2dlm.lvb);
+}
+
+static void o2cb_dump_lksb(struct ocfs2_dlm_lksb *lksb)
+{
+ dlm_print_one_lock(lksb->lksb_o2dlm.lockid);
+}
+
+/*
+ * Check if this node is heartbeating and is connected to all other
+ * heartbeating nodes.
+ */
+static int o2cb_cluster_check(void)
+{
+ u8 node_num;
+ int i;
+ unsigned long hbmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
+ unsigned long netmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
+
+ node_num = o2nm_this_node();
+ if (node_num == O2NM_MAX_NODES) {
+ printk(KERN_ERR "o2cb: This node has not been configured.\n");
+ return -EINVAL;
+ }
+
+ /*
+ * o2dlm expects o2net sockets to be created. If not, then
+ * dlm_join_domain() fails with a stack of errors which are both cryptic
+ * and incomplete. The idea here is to detect upfront whether we have
+ * managed to connect to all nodes or not. If not, then list the nodes
+ * to allow the user to check the configuration (incorrect IP, firewall,
+ * etc.) Yes, this is racy. But its not the end of the world.
+ */
+#define O2CB_MAP_STABILIZE_COUNT 60
+ for (i = 0; i < O2CB_MAP_STABILIZE_COUNT; ++i) {
+ o2hb_fill_node_map(hbmap, sizeof(hbmap));
+ if (!test_bit(node_num, hbmap)) {
+ printk(KERN_ERR "o2cb: %s heartbeat has not been "
+ "started.\n", (o2hb_global_heartbeat_active() ?
+ "Global" : "Local"));
+ return -EINVAL;
+ }
+ o2net_fill_node_map(netmap, sizeof(netmap));
+ /* Force set the current node to allow easy compare */
+ set_bit(node_num, netmap);
+ if (!memcmp(hbmap, netmap, sizeof(hbmap)))
+ return 0;
+ if (i < O2CB_MAP_STABILIZE_COUNT - 1)
+ msleep(1000);
+ }
+
+ printk(KERN_ERR "o2cb: This node could not connect to nodes:");
+ i = -1;
+ while ((i = find_next_bit(hbmap, O2NM_MAX_NODES,
+ i + 1)) < O2NM_MAX_NODES) {
+ if (!test_bit(i, netmap))
+ printk(" %u", i);
+ }
+ printk(".\n");
+
+ return -ENOTCONN;
+}
+
+/*
+ * Called from the dlm when it's about to evict a node. This is how the
+ * classic stack signals node death.
+ */
+static void o2dlm_eviction_cb(int node_num, void *data)
+{
+ struct ocfs2_cluster_connection *conn = data;
+
+ printk(KERN_NOTICE "o2cb: o2dlm has evicted node %d from domain %.*s\n",
+ node_num, conn->cc_namelen, conn->cc_name);
+
+ conn->cc_recovery_handler(node_num, conn->cc_recovery_data);
+}
+
+static int o2cb_cluster_connect(struct ocfs2_cluster_connection *conn)
+{
+ int rc = 0;
+ u32 dlm_key;
+ struct dlm_ctxt *dlm;
+ struct o2dlm_private *priv;
+ struct dlm_protocol_version fs_version;
+
+ BUG_ON(conn == NULL);
+ BUG_ON(conn->cc_proto == NULL);
+
+ /* Ensure cluster stack is up and all nodes are connected */
+ rc = o2cb_cluster_check();
+ if (rc) {
+ printk(KERN_ERR "o2cb: Cluster check failed. Fix errors "
+ "before retrying.\n");
+ goto out;
+ }
+
+ priv = kzalloc(sizeof(struct o2dlm_private), GFP_KERNEL);
+ if (!priv) {
+ rc = -ENOMEM;
+ goto out_free;
+ }
+
+ /* This just fills the structure in. It is safe to pass conn. */
+ dlm_setup_eviction_cb(&priv->op_eviction_cb, o2dlm_eviction_cb,
+ conn);
+
+ conn->cc_private = priv;
+
+ /* used by the dlm code to make message headers unique, each
+ * node in this domain must agree on this. */
+ dlm_key = crc32_le(0, conn->cc_name, conn->cc_namelen);
+ fs_version.pv_major = conn->cc_version.pv_major;
+ fs_version.pv_minor = conn->cc_version.pv_minor;
+
+ dlm = dlm_register_domain(conn->cc_name, dlm_key, &fs_version);
+ if (IS_ERR(dlm)) {
+ rc = PTR_ERR(dlm);
+ mlog_errno(rc);
+ goto out_free;
+ }
+
+ conn->cc_version.pv_major = fs_version.pv_major;
+ conn->cc_version.pv_minor = fs_version.pv_minor;
+ conn->cc_lockspace = dlm;
+
+ dlm_register_eviction_cb(dlm, &priv->op_eviction_cb);
+
+out_free:
+ if (rc)
+ kfree(conn->cc_private);
+
+out:
+ return rc;
+}
+
+static int o2cb_cluster_disconnect(struct ocfs2_cluster_connection *conn)
+{
+ struct dlm_ctxt *dlm = conn->cc_lockspace;
+ struct o2dlm_private *priv = conn->cc_private;
+
+ dlm_unregister_eviction_cb(&priv->op_eviction_cb);
+ conn->cc_private = NULL;
+ kfree(priv);
+
+ dlm_unregister_domain(dlm);
+ conn->cc_lockspace = NULL;
+
+ return 0;
+}
+
+static int o2cb_cluster_this_node(struct ocfs2_cluster_connection *conn,
+ unsigned int *node)
+{
+ int node_num;
+
+ node_num = o2nm_this_node();
+ if (node_num == O2NM_INVALID_NODE_NUM)
+ return -ENOENT;
+
+ if (node_num >= O2NM_MAX_NODES)
+ return -EOVERFLOW;
+
+ *node = node_num;
+ return 0;
+}
+
+static struct ocfs2_stack_operations o2cb_stack_ops = {
+ .connect = o2cb_cluster_connect,
+ .disconnect = o2cb_cluster_disconnect,
+ .this_node = o2cb_cluster_this_node,
+ .dlm_lock = o2cb_dlm_lock,
+ .dlm_unlock = o2cb_dlm_unlock,
+ .lock_status = o2cb_dlm_lock_status,
+ .lvb_valid = o2cb_dlm_lvb_valid,
+ .lock_lvb = o2cb_dlm_lvb,
+ .dump_lksb = o2cb_dump_lksb,
+};
+
+static struct ocfs2_stack_plugin o2cb_stack = {
+ .sp_name = "o2cb",
+ .sp_ops = &o2cb_stack_ops,
+ .sp_owner = THIS_MODULE,
+};
+
+static int __init o2cb_stack_init(void)
+{
+ return ocfs2_stack_glue_register(&o2cb_stack);
+}
+
+static void __exit o2cb_stack_exit(void)
+{
+ ocfs2_stack_glue_unregister(&o2cb_stack);
+}
+
+MODULE_AUTHOR("Oracle");
+MODULE_DESCRIPTION("ocfs2 driver for the classic o2cb stack");
+MODULE_LICENSE("GPL");
+module_init(o2cb_stack_init);
+module_exit(o2cb_stack_exit);
Code Review / kvmfornfv.git / blobdiff