* Code which implements an OCFS2 specific interface to underlying
* cluster stacks.
*
- * Copyright (C) 2007 Oracle. All rights reserved.
+ * Copyright (C) 2007, 2009 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
* General Public License for more details.
*/
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/module.h>
#include <linux/slab.h>
-#include <linux/crc32.h>
#include <linux/kmod.h>
-
-/* Needed for AOP_TRUNCATED_PAGE in mlog_errno() */
#include <linux/fs.h>
+#include <linux/kobject.h>
+#include <linux/sysfs.h>
+#include <linux/sysctl.h>
-#include "cluster/masklog.h"
-#include "cluster/nodemanager.h"
-#include "cluster/heartbeat.h"
+#include "ocfs2_fs.h"
#include "stackglue.h"
+#define OCFS2_STACK_PLUGIN_O2CB "o2cb"
+#define OCFS2_STACK_PLUGIN_USER "user"
+#define OCFS2_MAX_HB_CTL_PATH 256
+
static struct ocfs2_locking_protocol *lproto;
+static DEFINE_SPINLOCK(ocfs2_stack_lock);
+static LIST_HEAD(ocfs2_stack_list);
+static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1];
+static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl";
-struct o2dlm_private {
- struct dlm_eviction_cb op_eviction_cb;
-};
+/*
+ * The stack currently in use. If not null, active_stack->sp_count > 0,
+ * the module is pinned, and the locking protocol cannot be changed.
+ */
+static struct ocfs2_stack_plugin *active_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)
+static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name)
{
- BUG_ON(mode > LKM_MAXMODE);
+ struct ocfs2_stack_plugin *p;
- return mode;
-}
+ assert_spin_locked(&ocfs2_stack_lock);
-#define map_flag(_generic, _o2dlm) \
- if (flags & (_generic)) { \
- flags &= ~(_generic); \
- o2dlm_flags |= (_o2dlm); \
+ list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
+ if (!strcmp(p->sp_name, name))
+ return p;
}
-static int flags_to_o2dlm(u32 flags)
+
+ return NULL;
+}
+
+static int ocfs2_stack_driver_request(const char *stack_name,
+ const char *plugin_name)
{
- 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;
+ int rc;
+ struct ocfs2_stack_plugin *p;
+
+ spin_lock(&ocfs2_stack_lock);
+
+ /*
+ * If the stack passed by the filesystem isn't the selected one,
+ * we can't continue.
+ */
+ if (strcmp(stack_name, cluster_stack_name)) {
+ rc = -EBUSY;
+ goto out;
+ }
+
+ if (active_stack) {
+ /*
+ * If the active stack isn't the one we want, it cannot
+ * be selected right now.
+ */
+ if (!strcmp(active_stack->sp_name, plugin_name))
+ rc = 0;
+ else
+ rc = -EBUSY;
+ goto out;
+ }
+
+ p = ocfs2_stack_lookup(plugin_name);
+ if (!p || !try_module_get(p->sp_owner)) {
+ rc = -ENOENT;
+ goto out;
+ }
+
+ active_stack = p;
+ rc = 0;
+
+out:
+ /* If we found it, pin it */
+ if (!rc)
+ active_stack->sp_count++;
+
+ spin_unlock(&ocfs2_stack_lock);
+ return rc;
}
-#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
+ * This function looks up the appropriate stack and makes it active. If
+ * there is no stack, it tries to load it. It will fail if the stack still
+ * cannot be found. It will also fail if a different stack is in use.
*/
-/* 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)
+static int ocfs2_stack_driver_get(const char *stack_name)
{
- BUG_ON(status > (sizeof(status_map) / sizeof(status_map[0])));
+ int rc;
+ char *plugin_name = OCFS2_STACK_PLUGIN_O2CB;
+
+ /*
+ * Classic stack does not pass in a stack name. This is
+ * compatible with older tools as well.
+ */
+ if (!stack_name || !*stack_name)
+ stack_name = OCFS2_STACK_PLUGIN_O2CB;
+
+ if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) {
+ printk(KERN_ERR
+ "ocfs2 passed an invalid cluster stack label: \"%s\"\n",
+ stack_name);
+ return -EINVAL;
+ }
+
+ /* Anything that isn't the classic stack is a user stack */
+ if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB))
+ plugin_name = OCFS2_STACK_PLUGIN_USER;
+
+ rc = ocfs2_stack_driver_request(stack_name, plugin_name);
+ if (rc == -ENOENT) {
+ request_module("ocfs2_stack_%s", plugin_name);
+ rc = ocfs2_stack_driver_request(stack_name, plugin_name);
+ }
+
+ if (rc == -ENOENT) {
+ printk(KERN_ERR
+ "ocfs2: Cluster stack driver \"%s\" cannot be found\n",
+ plugin_name);
+ } else if (rc == -EBUSY) {
+ printk(KERN_ERR
+ "ocfs2: A different cluster stack is in use\n");
+ }
- return status_map[status];
+ return rc;
}
-static void o2dlm_lock_ast_wrapper(void *astarg)
+static void ocfs2_stack_driver_put(void)
{
- BUG_ON(lproto == NULL);
-
- lproto->lp_lock_ast(astarg);
+ spin_lock(&ocfs2_stack_lock);
+ BUG_ON(active_stack == NULL);
+ BUG_ON(active_stack->sp_count == 0);
+
+ active_stack->sp_count--;
+ if (!active_stack->sp_count) {
+ module_put(active_stack->sp_owner);
+ active_stack = NULL;
+ }
+ spin_unlock(&ocfs2_stack_lock);
}
-static void o2dlm_blocking_ast_wrapper(void *astarg, int level)
+int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin)
{
- BUG_ON(lproto == NULL);
+ int rc;
+
+ spin_lock(&ocfs2_stack_lock);
+ if (!ocfs2_stack_lookup(plugin->sp_name)) {
+ plugin->sp_count = 0;
+ plugin->sp_proto = lproto;
+ list_add(&plugin->sp_list, &ocfs2_stack_list);
+ printk(KERN_INFO "ocfs2: Registered cluster interface %s\n",
+ plugin->sp_name);
+ rc = 0;
+ } else {
+ printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n",
+ plugin->sp_name);
+ rc = -EEXIST;
+ }
+ spin_unlock(&ocfs2_stack_lock);
- lproto->lp_blocking_ast(astarg, level);
+ return rc;
}
+EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register);
-static void o2dlm_unlock_ast_wrapper(void *astarg, enum dlm_status status)
+void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin)
{
- int error = dlm_status_to_errno(status);
+ struct ocfs2_stack_plugin *p;
+
+ spin_lock(&ocfs2_stack_lock);
+ p = ocfs2_stack_lookup(plugin->sp_name);
+ if (p) {
+ BUG_ON(p != plugin);
+ BUG_ON(plugin == active_stack);
+ BUG_ON(plugin->sp_count != 0);
+ list_del_init(&plugin->sp_list);
+ printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n",
+ plugin->sp_name);
+ } else {
+ printk(KERN_ERR "Stack \"%s\" is not registered\n",
+ plugin->sp_name);
+ }
+ spin_unlock(&ocfs2_stack_lock);
+}
+EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister);
- BUG_ON(lproto == NULL);
+void ocfs2_stack_glue_set_locking_protocol(struct ocfs2_locking_protocol *proto)
+{
+ struct ocfs2_stack_plugin *p;
- /*
- * 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;
+ BUG_ON(proto == NULL);
+
+ spin_lock(&ocfs2_stack_lock);
+ BUG_ON(active_stack != NULL);
+
+ lproto = proto;
+ list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
+ p->sp_proto = lproto;
+ }
- lproto->lp_unlock_ast(astarg, error);
+ spin_unlock(&ocfs2_stack_lock);
}
+EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_locking_protocol);
+
+/*
+ * The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take
+ * "struct ocfs2_lock_res *astarg" instead of "void *astarg" because the
+ * underlying stack plugins need to pilfer the lksb off of the lock_res.
+ * If some other structure needs to be passed as an astarg, the plugins
+ * will need to be given a different avenue to the lksb.
+ */
int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn,
int mode,
union ocfs2_dlm_lksb *lksb,
u32 flags,
void *name,
unsigned int namelen,
- void *astarg)
+ struct ocfs2_lock_res *astarg)
{
- enum dlm_status status;
- int o2dlm_mode = mode_to_o2dlm(mode);
- int o2dlm_flags = flags_to_o2dlm(flags);
- int ret;
-
BUG_ON(lproto == NULL);
- status = dlmlock(conn->cc_lockspace, o2dlm_mode, &lksb->lksb_o2dlm,
- o2dlm_flags, name, namelen,
- o2dlm_lock_ast_wrapper, astarg,
- o2dlm_blocking_ast_wrapper);
- ret = dlm_status_to_errno(status);
- return ret;
+ return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags,
+ name, namelen, astarg);
}
+EXPORT_SYMBOL_GPL(ocfs2_dlm_lock);
int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn,
union ocfs2_dlm_lksb *lksb,
u32 flags,
- void *astarg)
+ struct ocfs2_lock_res *astarg)
{
- enum dlm_status status;
- int o2dlm_flags = flags_to_o2dlm(flags);
- int ret;
-
BUG_ON(lproto == NULL);
- status = dlmunlock(conn->cc_lockspace, &lksb->lksb_o2dlm,
- o2dlm_flags, o2dlm_unlock_ast_wrapper, astarg);
- ret = dlm_status_to_errno(status);
- return ret;
+ return active_stack->sp_ops->dlm_unlock(conn, lksb, flags, astarg);
}
+EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock);
int ocfs2_dlm_lock_status(union ocfs2_dlm_lksb *lksb)
{
- return dlm_status_to_errno(lksb->lksb_o2dlm.status);
+ return active_stack->sp_ops->lock_status(lksb);
}
+EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status);
+
+int ocfs2_dlm_lvb_valid(union ocfs2_dlm_lksb *lksb)
+{
+ return active_stack->sp_ops->lvb_valid(lksb);
+}
+EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid);
-/*
- * Why don't we cast to ocfs2_meta_lvb? The "clean" answer is that we
- * don't cast at the glue level. The real answer is that the header
- * ordering is nigh impossible.
- */
void *ocfs2_dlm_lvb(union ocfs2_dlm_lksb *lksb)
{
- return (void *)(lksb->lksb_o2dlm.lvb);
+ return active_stack->sp_ops->lock_lvb(lksb);
}
+EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb);
void ocfs2_dlm_dump_lksb(union ocfs2_dlm_lksb *lksb)
{
- dlm_print_one_lock(lksb->lksb_o2dlm.lockid);
+ active_stack->sp_ops->dump_lksb(lksb);
}
+EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb);
+
+int ocfs2_stack_supports_plocks(void)
+{
+ return active_stack && active_stack->sp_ops->plock;
+}
+EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks);
/*
- * Called from the dlm when it's about to evict a node. This is how the
- * classic stack signals node death.
+ * ocfs2_plock() can only be safely called if
+ * ocfs2_stack_supports_plocks() returned true
*/
-static void o2dlm_eviction_cb(int node_num, void *data)
+int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino,
+ struct file *file, int cmd, struct file_lock *fl)
{
- struct ocfs2_cluster_connection *conn = data;
-
- mlog(ML_NOTICE, "o2dlm has evicted node %d from group %.*s\n",
- node_num, conn->cc_namelen, conn->cc_name);
-
- conn->cc_recovery_handler(node_num, conn->cc_recovery_data);
+ WARN_ON_ONCE(active_stack->sp_ops->plock == NULL);
+ if (active_stack->sp_ops->plock)
+ return active_stack->sp_ops->plock(conn, ino, file, cmd, fl);
+ return -EOPNOTSUPP;
}
+EXPORT_SYMBOL_GPL(ocfs2_plock);
-int ocfs2_cluster_connect(const char *group,
+int ocfs2_cluster_connect(const char *stack_name,
+ const char *group,
int grouplen,
void (*recovery_handler)(int node_num,
void *recovery_data),
{
int rc = 0;
struct ocfs2_cluster_connection *new_conn;
- u32 dlm_key;
- struct dlm_ctxt *dlm;
- struct o2dlm_private *priv;
- struct dlm_protocol_version dlm_version;
BUG_ON(group == NULL);
BUG_ON(conn == NULL);
goto out;
}
- /* for now we only have one cluster/node, make sure we see it
- * in the heartbeat universe */
- if (!o2hb_check_local_node_heartbeating()) {
- rc = -EINVAL;
- goto out;
- }
-
new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection),
GFP_KERNEL);
if (!new_conn) {
/* Start the new connection at our maximum compatibility level */
new_conn->cc_version = lproto->lp_max_version;
- priv = kzalloc(sizeof(struct o2dlm_private), GFP_KERNEL);
- if (!priv) {
- rc = -ENOMEM;
+ /* This will pin the stack driver if successful */
+ rc = ocfs2_stack_driver_get(stack_name);
+ if (rc)
goto out_free;
- }
-
- /* This just fills the structure in. It is safe to use new_conn. */
- dlm_setup_eviction_cb(&priv->op_eviction_cb, o2dlm_eviction_cb,
- new_conn);
- new_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, group, grouplen);
- dlm_version.pv_major = new_conn->cc_version.pv_major;
- dlm_version.pv_minor = new_conn->cc_version.pv_minor;
-
- dlm = dlm_register_domain(group, dlm_key, &dlm_version);
- if (IS_ERR(dlm)) {
- rc = PTR_ERR(dlm);
- mlog_errno(rc);
+ rc = active_stack->sp_ops->connect(new_conn);
+ if (rc) {
+ ocfs2_stack_driver_put();
goto out_free;
}
- new_conn->cc_version.pv_major = dlm_version.pv_major;
- new_conn->cc_version.pv_minor = dlm_version.pv_minor;
- new_conn->cc_lockspace = dlm;
-
- dlm_register_eviction_cb(dlm, &priv->op_eviction_cb);
-
*conn = new_conn;
out_free:
- if (rc) {
- kfree(new_conn->cc_private);
+ if (rc)
kfree(new_conn);
- }
out:
return rc;
}
+EXPORT_SYMBOL_GPL(ocfs2_cluster_connect);
-
-int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn)
+/* If hangup_pending is 0, the stack driver will be dropped */
+int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn,
+ int hangup_pending)
{
- struct dlm_ctxt *dlm = conn->cc_lockspace;
- struct o2dlm_private *priv = conn->cc_private;
+ int ret;
- dlm_unregister_eviction_cb(&priv->op_eviction_cb);
- dlm_unregister_domain(dlm);
+ BUG_ON(conn == NULL);
- kfree(priv);
- kfree(conn);
+ ret = active_stack->sp_ops->disconnect(conn);
- return 0;
+ /* XXX Should we free it anyway? */
+ if (!ret) {
+ kfree(conn);
+ if (!hangup_pending)
+ ocfs2_stack_driver_put();
+ }
+
+ return ret;
}
+EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect);
-static void o2hb_stop(const char *group)
+/*
+ * Leave the group for this filesystem. This is executed by a userspace
+ * program (stored in ocfs2_hb_ctl_path).
+ */
+static void ocfs2_leave_group(const char *group)
{
int ret;
char *argv[5], *envp[3];
- argv[0] = (char *)o2nm_get_hb_ctl_path();
+ argv[0] = ocfs2_hb_ctl_path;
argv[1] = "-K";
argv[2] = "-u";
argv[3] = (char *)group;
argv[4] = NULL;
- mlog(0, "Run: %s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
-
/* minimal command environment taken from cpu_run_sbin_hotplug */
envp[0] = "HOME=/";
envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
envp[2] = NULL;
ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
- if (ret < 0)
- mlog_errno(ret);
+ if (ret < 0) {
+ printk(KERN_ERR
+ "ocfs2: Error %d running user helper "
+ "\"%s %s %s %s\"\n",
+ ret, argv[0], argv[1], argv[2], argv[3]);
+ }
}
/*
- * Hangup is a hack for tools compatibility. Older ocfs2-tools software
- * expects the filesystem to call "ocfs2_hb_ctl" during unmount. This
- * happens regardless of whether the DLM got started, so we can't do it
- * in ocfs2_cluster_disconnect(). We bring the o2hb_stop() function into
- * the glue and provide a "hangup" API for super.c to call.
- *
- * Other stacks will eventually provide a NULL ->hangup() pointer.
+ * Hangup is a required post-umount. ocfs2-tools software expects the
+ * filesystem to call "ocfs2_hb_ctl" during unmount. This happens
+ * regardless of whether the DLM got started, so we can't do it
+ * in ocfs2_cluster_disconnect(). The ocfs2_leave_group() function does
+ * the actual work.
*/
void ocfs2_cluster_hangup(const char *group, int grouplen)
{
BUG_ON(group == NULL);
BUG_ON(group[grouplen] != '\0');
- o2hb_stop(group);
+ ocfs2_leave_group(group);
+
+ /* cluster_disconnect() was called with hangup_pending==1 */
+ ocfs2_stack_driver_put();
}
+EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup);
int ocfs2_cluster_this_node(unsigned int *node)
{
- int node_num;
+ return active_stack->sp_ops->this_node(node);
+}
+EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node);
+
+
+/*
+ * Sysfs bits
+ */
+
+static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ ssize_t ret = 0;
+
+ spin_lock(&ocfs2_stack_lock);
+ if (lproto)
+ ret = snprintf(buf, PAGE_SIZE, "%u.%u\n",
+ lproto->lp_max_version.pv_major,
+ lproto->lp_max_version.pv_minor);
+ spin_unlock(&ocfs2_stack_lock);
+
+ return ret;
+}
+
+static struct kobj_attribute ocfs2_attr_max_locking_protocol =
+ __ATTR(max_locking_protocol, S_IFREG | S_IRUGO,
+ ocfs2_max_locking_protocol_show, NULL);
+
+static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ ssize_t ret = 0, total = 0, remain = PAGE_SIZE;
+ struct ocfs2_stack_plugin *p;
+
+ spin_lock(&ocfs2_stack_lock);
+ list_for_each_entry(p, &ocfs2_stack_list, sp_list) {
+ ret = snprintf(buf, remain, "%s\n",
+ p->sp_name);
+ if (ret < 0) {
+ total = ret;
+ break;
+ }
+ if (ret == remain) {
+ /* snprintf() didn't fit */
+ total = -E2BIG;
+ break;
+ }
+ total += ret;
+ remain -= ret;
+ }
+ spin_unlock(&ocfs2_stack_lock);
+
+ return total;
+}
+
+static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins =
+ __ATTR(loaded_cluster_plugins, S_IFREG | S_IRUGO,
+ ocfs2_loaded_cluster_plugins_show, NULL);
+
+static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ ssize_t ret = 0;
+
+ spin_lock(&ocfs2_stack_lock);
+ if (active_stack) {
+ ret = snprintf(buf, PAGE_SIZE, "%s\n",
+ active_stack->sp_name);
+ if (ret == PAGE_SIZE)
+ ret = -E2BIG;
+ }
+ spin_unlock(&ocfs2_stack_lock);
+
+ return ret;
+}
+
+static struct kobj_attribute ocfs2_attr_active_cluster_plugin =
+ __ATTR(active_cluster_plugin, S_IFREG | S_IRUGO,
+ ocfs2_active_cluster_plugin_show, NULL);
+
+static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ char *buf)
+{
+ ssize_t ret;
+ spin_lock(&ocfs2_stack_lock);
+ ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name);
+ spin_unlock(&ocfs2_stack_lock);
+
+ return ret;
+}
+
+static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t count)
+{
+ size_t len = count;
+ ssize_t ret;
+
+ if (len == 0)
+ return len;
+
+ if (buf[len - 1] == '\n')
+ len--;
+
+ if ((len != OCFS2_STACK_LABEL_LEN) ||
+ (strnlen(buf, len) != len))
+ return -EINVAL;
+
+ spin_lock(&ocfs2_stack_lock);
+ if (active_stack) {
+ if (!strncmp(buf, cluster_stack_name, len))
+ ret = count;
+ else
+ ret = -EBUSY;
+ } else {
+ memcpy(cluster_stack_name, buf, len);
+ ret = count;
+ }
+ spin_unlock(&ocfs2_stack_lock);
+
+ return ret;
+}
+
+
+static struct kobj_attribute ocfs2_attr_cluster_stack =
+ __ATTR(cluster_stack, S_IFREG | S_IRUGO | S_IWUSR,
+ ocfs2_cluster_stack_show,
+ ocfs2_cluster_stack_store);
+
+static struct attribute *ocfs2_attrs[] = {
+ &ocfs2_attr_max_locking_protocol.attr,
+ &ocfs2_attr_loaded_cluster_plugins.attr,
+ &ocfs2_attr_active_cluster_plugin.attr,
+ &ocfs2_attr_cluster_stack.attr,
+ NULL,
+};
+
+static struct attribute_group ocfs2_attr_group = {
+ .attrs = ocfs2_attrs,
+};
+
+static struct kset *ocfs2_kset;
+
+static void ocfs2_sysfs_exit(void)
+{
+ kset_unregister(ocfs2_kset);
+}
- node_num = o2nm_this_node();
- if (node_num == O2NM_INVALID_NODE_NUM)
- return -ENOENT;
+static int ocfs2_sysfs_init(void)
+{
+ int ret;
+
+ ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj);
+ if (!ocfs2_kset)
+ return -ENOMEM;
- if (node_num >= O2NM_MAX_NODES)
- return -EOVERFLOW;
+ ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group);
+ if (ret)
+ goto error;
- *node = node_num;
return 0;
+
+error:
+ kset_unregister(ocfs2_kset);
+ return ret;
}
-void o2cb_get_stack(struct ocfs2_locking_protocol *proto)
+/*
+ * Sysctl bits
+ *
+ * The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path. The 'nm' doesn't
+ * make as much sense in a multiple cluster stack world, but it's safer
+ * and easier to preserve the name.
+ */
+
+#define FS_OCFS2_NM 1
+
+static ctl_table ocfs2_nm_table[] = {
+ {
+ .ctl_name = 1,
+ .procname = "hb_ctl_path",
+ .data = ocfs2_hb_ctl_path,
+ .maxlen = OCFS2_MAX_HB_CTL_PATH,
+ .mode = 0644,
+ .proc_handler = &proc_dostring,
+ .strategy = &sysctl_string,
+ },
+ { .ctl_name = 0 }
+};
+
+static ctl_table ocfs2_mod_table[] = {
+ {
+ .ctl_name = FS_OCFS2_NM,
+ .procname = "nm",
+ .data = NULL,
+ .maxlen = 0,
+ .mode = 0555,
+ .child = ocfs2_nm_table
+ },
+ { .ctl_name = 0}
+};
+
+static ctl_table ocfs2_kern_table[] = {
+ {
+ .ctl_name = FS_OCFS2,
+ .procname = "ocfs2",
+ .data = NULL,
+ .maxlen = 0,
+ .mode = 0555,
+ .child = ocfs2_mod_table
+ },
+ { .ctl_name = 0}
+};
+
+static ctl_table ocfs2_root_table[] = {
+ {
+ .ctl_name = CTL_FS,
+ .procname = "fs",
+ .data = NULL,
+ .maxlen = 0,
+ .mode = 0555,
+ .child = ocfs2_kern_table
+ },
+ { .ctl_name = 0 }
+};
+
+static struct ctl_table_header *ocfs2_table_header = NULL;
+
+
+/*
+ * Initialization
+ */
+
+static int __init ocfs2_stack_glue_init(void)
{
- BUG_ON(proto == NULL);
+ strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB);
- lproto = proto;
+ ocfs2_table_header = register_sysctl_table(ocfs2_root_table);
+ if (!ocfs2_table_header) {
+ printk(KERN_ERR
+ "ocfs2 stack glue: unable to register sysctl\n");
+ return -ENOMEM; /* or something. */
+ }
+
+ return ocfs2_sysfs_init();
}
-void o2cb_put_stack(void)
+static void __exit ocfs2_stack_glue_exit(void)
{
lproto = NULL;
+ ocfs2_sysfs_exit();
+ if (ocfs2_table_header)
+ unregister_sysctl_table(ocfs2_table_header);
}
+
+MODULE_AUTHOR("Oracle");
+MODULE_DESCRIPTION("ocfs2 cluter stack glue layer");
+MODULE_LICENSE("GPL");
+module_init(ocfs2_stack_glue_init);
+module_exit(ocfs2_stack_glue_exit);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff