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697 lines
16 KiB
697 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* stackglue.c |
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* |
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* Code which implements an OCFS2 specific interface to underlying |
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* cluster stacks. |
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* |
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* Copyright (C) 2007, 2009 Oracle. All rights reserved. |
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*/ |
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|
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#include <linux/list.h> |
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#include <linux/spinlock.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/kmod.h> |
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#include <linux/fs.h> |
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#include <linux/kobject.h> |
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#include <linux/sysfs.h> |
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#include <linux/sysctl.h> |
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#include "ocfs2_fs.h" |
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#include "stackglue.h" |
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#define OCFS2_STACK_PLUGIN_O2CB "o2cb" |
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#define OCFS2_STACK_PLUGIN_USER "user" |
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#define OCFS2_MAX_HB_CTL_PATH 256 |
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static struct ocfs2_protocol_version locking_max_version; |
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static DEFINE_SPINLOCK(ocfs2_stack_lock); |
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static LIST_HEAD(ocfs2_stack_list); |
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static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1]; |
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static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl"; |
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|
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/* |
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* The stack currently in use. If not null, active_stack->sp_count > 0, |
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* the module is pinned, and the locking protocol cannot be changed. |
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*/ |
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static struct ocfs2_stack_plugin *active_stack; |
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static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name) |
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{ |
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struct ocfs2_stack_plugin *p; |
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assert_spin_locked(&ocfs2_stack_lock); |
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list_for_each_entry(p, &ocfs2_stack_list, sp_list) { |
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if (!strcmp(p->sp_name, name)) |
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return p; |
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} |
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return NULL; |
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} |
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static int ocfs2_stack_driver_request(const char *stack_name, |
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const char *plugin_name) |
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{ |
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int rc; |
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struct ocfs2_stack_plugin *p; |
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spin_lock(&ocfs2_stack_lock); |
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|
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/* |
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* If the stack passed by the filesystem isn't the selected one, |
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* we can't continue. |
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*/ |
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if (strcmp(stack_name, cluster_stack_name)) { |
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rc = -EBUSY; |
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goto out; |
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} |
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|
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if (active_stack) { |
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/* |
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* If the active stack isn't the one we want, it cannot |
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* be selected right now. |
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*/ |
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if (!strcmp(active_stack->sp_name, plugin_name)) |
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rc = 0; |
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else |
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rc = -EBUSY; |
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goto out; |
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} |
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p = ocfs2_stack_lookup(plugin_name); |
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if (!p || !try_module_get(p->sp_owner)) { |
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rc = -ENOENT; |
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goto out; |
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} |
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active_stack = p; |
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rc = 0; |
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out: |
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/* If we found it, pin it */ |
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if (!rc) |
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active_stack->sp_count++; |
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spin_unlock(&ocfs2_stack_lock); |
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return rc; |
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} |
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/* |
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* This function looks up the appropriate stack and makes it active. If |
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* there is no stack, it tries to load it. It will fail if the stack still |
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* cannot be found. It will also fail if a different stack is in use. |
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*/ |
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static int ocfs2_stack_driver_get(const char *stack_name) |
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{ |
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int rc; |
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char *plugin_name = OCFS2_STACK_PLUGIN_O2CB; |
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|
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/* |
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* Classic stack does not pass in a stack name. This is |
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* compatible with older tools as well. |
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*/ |
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if (!stack_name || !*stack_name) |
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stack_name = OCFS2_STACK_PLUGIN_O2CB; |
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if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) { |
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printk(KERN_ERR |
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"ocfs2 passed an invalid cluster stack label: \"%s\"\n", |
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stack_name); |
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return -EINVAL; |
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} |
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/* Anything that isn't the classic stack is a user stack */ |
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if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB)) |
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plugin_name = OCFS2_STACK_PLUGIN_USER; |
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rc = ocfs2_stack_driver_request(stack_name, plugin_name); |
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if (rc == -ENOENT) { |
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request_module("ocfs2_stack_%s", plugin_name); |
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rc = ocfs2_stack_driver_request(stack_name, plugin_name); |
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} |
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if (rc == -ENOENT) { |
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printk(KERN_ERR |
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"ocfs2: Cluster stack driver \"%s\" cannot be found\n", |
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plugin_name); |
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} else if (rc == -EBUSY) { |
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printk(KERN_ERR |
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"ocfs2: A different cluster stack is in use\n"); |
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} |
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return rc; |
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} |
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static void ocfs2_stack_driver_put(void) |
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{ |
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spin_lock(&ocfs2_stack_lock); |
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BUG_ON(active_stack == NULL); |
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BUG_ON(active_stack->sp_count == 0); |
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active_stack->sp_count--; |
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if (!active_stack->sp_count) { |
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module_put(active_stack->sp_owner); |
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active_stack = NULL; |
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} |
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spin_unlock(&ocfs2_stack_lock); |
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} |
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int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin) |
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{ |
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int rc; |
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spin_lock(&ocfs2_stack_lock); |
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if (!ocfs2_stack_lookup(plugin->sp_name)) { |
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plugin->sp_count = 0; |
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plugin->sp_max_proto = locking_max_version; |
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list_add(&plugin->sp_list, &ocfs2_stack_list); |
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printk(KERN_INFO "ocfs2: Registered cluster interface %s\n", |
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plugin->sp_name); |
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rc = 0; |
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} else { |
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printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n", |
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plugin->sp_name); |
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rc = -EEXIST; |
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} |
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spin_unlock(&ocfs2_stack_lock); |
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return rc; |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register); |
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void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin) |
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{ |
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struct ocfs2_stack_plugin *p; |
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spin_lock(&ocfs2_stack_lock); |
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p = ocfs2_stack_lookup(plugin->sp_name); |
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if (p) { |
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BUG_ON(p != plugin); |
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BUG_ON(plugin == active_stack); |
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BUG_ON(plugin->sp_count != 0); |
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list_del_init(&plugin->sp_list); |
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printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n", |
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plugin->sp_name); |
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} else { |
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printk(KERN_ERR "Stack \"%s\" is not registered\n", |
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plugin->sp_name); |
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} |
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spin_unlock(&ocfs2_stack_lock); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister); |
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|
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void ocfs2_stack_glue_set_max_proto_version(struct ocfs2_protocol_version *max_proto) |
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{ |
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struct ocfs2_stack_plugin *p; |
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spin_lock(&ocfs2_stack_lock); |
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if (memcmp(max_proto, &locking_max_version, |
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sizeof(struct ocfs2_protocol_version))) { |
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BUG_ON(locking_max_version.pv_major != 0); |
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locking_max_version = *max_proto; |
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list_for_each_entry(p, &ocfs2_stack_list, sp_list) { |
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p->sp_max_proto = locking_max_version; |
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} |
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} |
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spin_unlock(&ocfs2_stack_lock); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_max_proto_version); |
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/* |
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* The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take no argument |
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* for the ast and bast functions. They will pass the lksb to the ast |
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* and bast. The caller can wrap the lksb with their own structure to |
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* get more information. |
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*/ |
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int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn, |
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int mode, |
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struct ocfs2_dlm_lksb *lksb, |
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u32 flags, |
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void *name, |
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unsigned int namelen) |
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{ |
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if (!lksb->lksb_conn) |
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lksb->lksb_conn = conn; |
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else |
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BUG_ON(lksb->lksb_conn != conn); |
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return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags, |
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name, namelen); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_dlm_lock); |
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int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn, |
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struct ocfs2_dlm_lksb *lksb, |
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u32 flags) |
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{ |
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BUG_ON(lksb->lksb_conn == NULL); |
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return active_stack->sp_ops->dlm_unlock(conn, lksb, flags); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock); |
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int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
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{ |
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return active_stack->sp_ops->lock_status(lksb); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status); |
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int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
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{ |
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return active_stack->sp_ops->lvb_valid(lksb); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid); |
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void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
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{ |
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return active_stack->sp_ops->lock_lvb(lksb); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb); |
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void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
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{ |
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active_stack->sp_ops->dump_lksb(lksb); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb); |
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int ocfs2_stack_supports_plocks(void) |
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{ |
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return active_stack && active_stack->sp_ops->plock; |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks); |
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|
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/* |
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* ocfs2_plock() can only be safely called if |
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* ocfs2_stack_supports_plocks() returned true |
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*/ |
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int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino, |
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struct file *file, int cmd, struct file_lock *fl) |
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{ |
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WARN_ON_ONCE(active_stack->sp_ops->plock == NULL); |
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if (active_stack->sp_ops->plock) |
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return active_stack->sp_ops->plock(conn, ino, file, cmd, fl); |
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return -EOPNOTSUPP; |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_plock); |
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int ocfs2_cluster_connect(const char *stack_name, |
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const char *cluster_name, |
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int cluster_name_len, |
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const char *group, |
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int grouplen, |
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struct ocfs2_locking_protocol *lproto, |
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void (*recovery_handler)(int node_num, |
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void *recovery_data), |
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void *recovery_data, |
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struct ocfs2_cluster_connection **conn) |
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{ |
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int rc = 0; |
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struct ocfs2_cluster_connection *new_conn; |
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BUG_ON(group == NULL); |
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BUG_ON(conn == NULL); |
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BUG_ON(recovery_handler == NULL); |
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if (grouplen > GROUP_NAME_MAX) { |
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rc = -EINVAL; |
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goto out; |
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} |
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if (memcmp(&lproto->lp_max_version, &locking_max_version, |
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sizeof(struct ocfs2_protocol_version))) { |
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rc = -EINVAL; |
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goto out; |
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} |
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new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection), |
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GFP_KERNEL); |
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if (!new_conn) { |
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rc = -ENOMEM; |
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goto out; |
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} |
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strscpy(new_conn->cc_name, group, GROUP_NAME_MAX + 1); |
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new_conn->cc_namelen = grouplen; |
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if (cluster_name_len) |
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strscpy(new_conn->cc_cluster_name, cluster_name, |
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CLUSTER_NAME_MAX + 1); |
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new_conn->cc_cluster_name_len = cluster_name_len; |
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new_conn->cc_recovery_handler = recovery_handler; |
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new_conn->cc_recovery_data = recovery_data; |
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new_conn->cc_proto = lproto; |
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/* Start the new connection at our maximum compatibility level */ |
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new_conn->cc_version = lproto->lp_max_version; |
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/* This will pin the stack driver if successful */ |
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rc = ocfs2_stack_driver_get(stack_name); |
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if (rc) |
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goto out_free; |
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rc = active_stack->sp_ops->connect(new_conn); |
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if (rc) { |
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ocfs2_stack_driver_put(); |
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goto out_free; |
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} |
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*conn = new_conn; |
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out_free: |
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if (rc) |
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kfree(new_conn); |
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out: |
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return rc; |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_cluster_connect); |
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/* The caller will ensure all nodes have the same cluster stack */ |
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int ocfs2_cluster_connect_agnostic(const char *group, |
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int grouplen, |
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struct ocfs2_locking_protocol *lproto, |
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void (*recovery_handler)(int node_num, |
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void *recovery_data), |
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void *recovery_data, |
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struct ocfs2_cluster_connection **conn) |
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{ |
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char *stack_name = NULL; |
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if (cluster_stack_name[0]) |
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stack_name = cluster_stack_name; |
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return ocfs2_cluster_connect(stack_name, NULL, 0, group, grouplen, |
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lproto, recovery_handler, recovery_data, |
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conn); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_cluster_connect_agnostic); |
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|
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/* If hangup_pending is 0, the stack driver will be dropped */ |
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int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn, |
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int hangup_pending) |
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{ |
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int ret; |
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BUG_ON(conn == NULL); |
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ret = active_stack->sp_ops->disconnect(conn); |
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/* XXX Should we free it anyway? */ |
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if (!ret) { |
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kfree(conn); |
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if (!hangup_pending) |
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ocfs2_stack_driver_put(); |
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} |
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return ret; |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect); |
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/* |
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* Leave the group for this filesystem. This is executed by a userspace |
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* program (stored in ocfs2_hb_ctl_path). |
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*/ |
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static void ocfs2_leave_group(const char *group) |
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{ |
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int ret; |
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char *argv[5], *envp[3]; |
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argv[0] = ocfs2_hb_ctl_path; |
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argv[1] = "-K"; |
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argv[2] = "-u"; |
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argv[3] = (char *)group; |
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argv[4] = NULL; |
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/* minimal command environment taken from cpu_run_sbin_hotplug */ |
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envp[0] = "HOME=/"; |
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envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; |
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envp[2] = NULL; |
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ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); |
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if (ret < 0) { |
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printk(KERN_ERR |
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"ocfs2: Error %d running user helper " |
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"\"%s %s %s %s\"\n", |
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ret, argv[0], argv[1], argv[2], argv[3]); |
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} |
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} |
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/* |
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* Hangup is a required post-umount. ocfs2-tools software expects the |
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* filesystem to call "ocfs2_hb_ctl" during unmount. This happens |
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* regardless of whether the DLM got started, so we can't do it |
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* in ocfs2_cluster_disconnect(). The ocfs2_leave_group() function does |
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* the actual work. |
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*/ |
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void ocfs2_cluster_hangup(const char *group, int grouplen) |
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{ |
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BUG_ON(group == NULL); |
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BUG_ON(group[grouplen] != '\0'); |
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ocfs2_leave_group(group); |
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|
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/* cluster_disconnect() was called with hangup_pending==1 */ |
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ocfs2_stack_driver_put(); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup); |
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int ocfs2_cluster_this_node(struct ocfs2_cluster_connection *conn, |
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unsigned int *node) |
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{ |
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return active_stack->sp_ops->this_node(conn, node); |
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} |
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EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node); |
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/* |
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* Sysfs bits |
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*/ |
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static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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char *buf) |
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{ |
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ssize_t ret = 0; |
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spin_lock(&ocfs2_stack_lock); |
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if (locking_max_version.pv_major) |
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ret = snprintf(buf, PAGE_SIZE, "%u.%u\n", |
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locking_max_version.pv_major, |
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locking_max_version.pv_minor); |
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spin_unlock(&ocfs2_stack_lock); |
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return ret; |
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} |
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static struct kobj_attribute ocfs2_attr_max_locking_protocol = |
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__ATTR(max_locking_protocol, S_IRUGO, |
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ocfs2_max_locking_protocol_show, NULL); |
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|
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static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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char *buf) |
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{ |
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ssize_t ret = 0, total = 0, remain = PAGE_SIZE; |
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struct ocfs2_stack_plugin *p; |
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spin_lock(&ocfs2_stack_lock); |
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list_for_each_entry(p, &ocfs2_stack_list, sp_list) { |
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ret = snprintf(buf, remain, "%s\n", |
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p->sp_name); |
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if (ret >= remain) { |
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/* snprintf() didn't fit */ |
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total = -E2BIG; |
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break; |
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} |
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total += ret; |
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remain -= ret; |
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} |
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spin_unlock(&ocfs2_stack_lock); |
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|
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return total; |
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} |
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|
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static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins = |
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__ATTR(loaded_cluster_plugins, S_IRUGO, |
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ocfs2_loaded_cluster_plugins_show, NULL); |
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|
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static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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char *buf) |
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{ |
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ssize_t ret = 0; |
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|
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spin_lock(&ocfs2_stack_lock); |
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if (active_stack) { |
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ret = snprintf(buf, PAGE_SIZE, "%s\n", |
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active_stack->sp_name); |
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if (ret >= PAGE_SIZE) |
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ret = -E2BIG; |
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} |
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spin_unlock(&ocfs2_stack_lock); |
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|
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return ret; |
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} |
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static struct kobj_attribute ocfs2_attr_active_cluster_plugin = |
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__ATTR(active_cluster_plugin, S_IRUGO, |
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ocfs2_active_cluster_plugin_show, NULL); |
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|
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static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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char *buf) |
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{ |
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ssize_t ret; |
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spin_lock(&ocfs2_stack_lock); |
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ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name); |
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spin_unlock(&ocfs2_stack_lock); |
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|
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return ret; |
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} |
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|
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static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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size_t len = count; |
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ssize_t ret; |
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|
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if (len == 0) |
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return len; |
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|
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if (buf[len - 1] == '\n') |
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len--; |
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|
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if ((len != OCFS2_STACK_LABEL_LEN) || |
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(strnlen(buf, len) != len)) |
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return -EINVAL; |
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|
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spin_lock(&ocfs2_stack_lock); |
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if (active_stack) { |
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if (!strncmp(buf, cluster_stack_name, len)) |
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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_IRUGO | S_IWUSR, |
|
ocfs2_cluster_stack_show, |
|
ocfs2_cluster_stack_store); |
|
|
|
|
|
|
|
static ssize_t ocfs2_dlm_recover_show(struct kobject *kobj, |
|
struct kobj_attribute *attr, |
|
char *buf) |
|
{ |
|
return snprintf(buf, PAGE_SIZE, "1\n"); |
|
} |
|
|
|
static struct kobj_attribute ocfs2_attr_dlm_recover_support = |
|
__ATTR(dlm_recover_callback_support, S_IRUGO, |
|
ocfs2_dlm_recover_show, NULL); |
|
|
|
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, |
|
&ocfs2_attr_dlm_recover_support.attr, |
|
NULL, |
|
}; |
|
|
|
static const struct attribute_group ocfs2_attr_group = { |
|
.attrs = ocfs2_attrs, |
|
}; |
|
|
|
struct kset *ocfs2_kset; |
|
EXPORT_SYMBOL_GPL(ocfs2_kset); |
|
|
|
static void ocfs2_sysfs_exit(void) |
|
{ |
|
kset_unregister(ocfs2_kset); |
|
} |
|
|
|
static int ocfs2_sysfs_init(void) |
|
{ |
|
int ret; |
|
|
|
ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj); |
|
if (!ocfs2_kset) |
|
return -ENOMEM; |
|
|
|
ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group); |
|
if (ret) |
|
goto error; |
|
|
|
return 0; |
|
|
|
error: |
|
kset_unregister(ocfs2_kset); |
|
return ret; |
|
} |
|
|
|
/* |
|
* 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. |
|
*/ |
|
|
|
static struct ctl_table ocfs2_nm_table[] = { |
|
{ |
|
.procname = "hb_ctl_path", |
|
.data = ocfs2_hb_ctl_path, |
|
.maxlen = OCFS2_MAX_HB_CTL_PATH, |
|
.mode = 0644, |
|
.proc_handler = proc_dostring, |
|
}, |
|
{ } |
|
}; |
|
|
|
static struct ctl_table_header *ocfs2_table_header; |
|
|
|
/* |
|
* Initialization |
|
*/ |
|
|
|
static int __init ocfs2_stack_glue_init(void) |
|
{ |
|
strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB); |
|
|
|
ocfs2_table_header = register_sysctl("fs/ocfs2/nm", ocfs2_nm_table); |
|
if (!ocfs2_table_header) { |
|
printk(KERN_ERR |
|
"ocfs2 stack glue: unable to register sysctl\n"); |
|
return -ENOMEM; /* or something. */ |
|
} |
|
|
|
return ocfs2_sysfs_init(); |
|
} |
|
|
|
static void __exit ocfs2_stack_glue_exit(void) |
|
{ |
|
memset(&locking_max_version, 0, |
|
sizeof(struct ocfs2_protocol_version)); |
|
ocfs2_sysfs_exit(); |
|
if (ocfs2_table_header) |
|
unregister_sysctl_table(ocfs2_table_header); |
|
} |
|
|
|
MODULE_AUTHOR("Oracle"); |
|
MODULE_DESCRIPTION("ocfs2 cluster stack glue layer"); |
|
MODULE_LICENSE("GPL"); |
|
module_init(ocfs2_stack_glue_init); |
|
module_exit(ocfs2_stack_glue_exit);
|
|
|