Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * stackglue.c |
| 5 | * |
| 6 | * Code which implements an OCFS2 specific interface to underlying |
| 7 | * cluster stacks. |
| 8 | * |
Joel Becker | 1c520df | 2009-06-19 15:14:13 -0700 | [diff] [blame] | 9 | * Copyright (C) 2007, 2009 Oracle. All rights reserved. |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public |
| 13 | * License as published by the Free Software Foundation, version 2. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 18 | * General Public License for more details. |
| 19 | */ |
| 20 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 21 | #include <linux/list.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/module.h> |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 24 | #include <linux/slab.h> |
Joel Becker | 6953b4c | 2008-01-29 16:59:56 -0800 | [diff] [blame] | 25 | #include <linux/kmod.h> |
Joel Becker | 74ae4e1 | 2008-01-31 23:56:17 -0800 | [diff] [blame] | 26 | #include <linux/fs.h> |
| 27 | #include <linux/kobject.h> |
| 28 | #include <linux/sysfs.h> |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 29 | #include <linux/sysctl.h> |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 30 | |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 31 | #include "ocfs2_fs.h" |
| 32 | |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 33 | #include "stackglue.h" |
| 34 | |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 35 | #define OCFS2_STACK_PLUGIN_O2CB "o2cb" |
| 36 | #define OCFS2_STACK_PLUGIN_USER "user" |
Joel Becker | 9f9a99f | 2008-05-30 15:43:58 -0700 | [diff] [blame] | 37 | #define OCFS2_MAX_HB_CTL_PATH 256 |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 38 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 39 | static struct ocfs2_locking_protocol *lproto; |
| 40 | static DEFINE_SPINLOCK(ocfs2_stack_lock); |
| 41 | static LIST_HEAD(ocfs2_stack_list); |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 42 | static char cluster_stack_name[OCFS2_STACK_LABEL_LEN + 1]; |
Joel Becker | 9f9a99f | 2008-05-30 15:43:58 -0700 | [diff] [blame] | 43 | static char ocfs2_hb_ctl_path[OCFS2_MAX_HB_CTL_PATH] = "/sbin/ocfs2_hb_ctl"; |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 44 | |
| 45 | /* |
| 46 | * The stack currently in use. If not null, active_stack->sp_count > 0, |
| 47 | * the module is pinned, and the locking protocol cannot be changed. |
| 48 | */ |
| 49 | static struct ocfs2_stack_plugin *active_stack; |
| 50 | |
| 51 | static struct ocfs2_stack_plugin *ocfs2_stack_lookup(const char *name) |
| 52 | { |
| 53 | struct ocfs2_stack_plugin *p; |
| 54 | |
| 55 | assert_spin_locked(&ocfs2_stack_lock); |
| 56 | |
| 57 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { |
| 58 | if (!strcmp(p->sp_name, name)) |
| 59 | return p; |
| 60 | } |
| 61 | |
| 62 | return NULL; |
| 63 | } |
| 64 | |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 65 | static int ocfs2_stack_driver_request(const char *stack_name, |
| 66 | const char *plugin_name) |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 67 | { |
| 68 | int rc; |
| 69 | struct ocfs2_stack_plugin *p; |
| 70 | |
| 71 | spin_lock(&ocfs2_stack_lock); |
| 72 | |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 73 | /* |
| 74 | * If the stack passed by the filesystem isn't the selected one, |
| 75 | * we can't continue. |
| 76 | */ |
| 77 | if (strcmp(stack_name, cluster_stack_name)) { |
| 78 | rc = -EBUSY; |
| 79 | goto out; |
| 80 | } |
| 81 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 82 | if (active_stack) { |
| 83 | /* |
| 84 | * If the active stack isn't the one we want, it cannot |
| 85 | * be selected right now. |
| 86 | */ |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 87 | if (!strcmp(active_stack->sp_name, plugin_name)) |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 88 | rc = 0; |
| 89 | else |
| 90 | rc = -EBUSY; |
| 91 | goto out; |
| 92 | } |
| 93 | |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 94 | p = ocfs2_stack_lookup(plugin_name); |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 95 | if (!p || !try_module_get(p->sp_owner)) { |
| 96 | rc = -ENOENT; |
| 97 | goto out; |
| 98 | } |
| 99 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 100 | active_stack = p; |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 101 | rc = 0; |
| 102 | |
| 103 | out: |
Joel Becker | d6817cd | 2008-08-22 14:30:10 -0700 | [diff] [blame] | 104 | /* If we found it, pin it */ |
| 105 | if (!rc) |
| 106 | active_stack->sp_count++; |
| 107 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 108 | spin_unlock(&ocfs2_stack_lock); |
| 109 | return rc; |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * This function looks up the appropriate stack and makes it active. If |
| 114 | * there is no stack, it tries to load it. It will fail if the stack still |
| 115 | * cannot be found. It will also fail if a different stack is in use. |
| 116 | */ |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 117 | static int ocfs2_stack_driver_get(const char *stack_name) |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 118 | { |
| 119 | int rc; |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 120 | char *plugin_name = OCFS2_STACK_PLUGIN_O2CB; |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 121 | |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 122 | /* |
| 123 | * Classic stack does not pass in a stack name. This is |
| 124 | * compatible with older tools as well. |
| 125 | */ |
| 126 | if (!stack_name || !*stack_name) |
| 127 | stack_name = OCFS2_STACK_PLUGIN_O2CB; |
| 128 | |
| 129 | if (strlen(stack_name) != OCFS2_STACK_LABEL_LEN) { |
| 130 | printk(KERN_ERR |
| 131 | "ocfs2 passed an invalid cluster stack label: \"%s\"\n", |
| 132 | stack_name); |
| 133 | return -EINVAL; |
| 134 | } |
| 135 | |
| 136 | /* Anything that isn't the classic stack is a user stack */ |
| 137 | if (strcmp(stack_name, OCFS2_STACK_PLUGIN_O2CB)) |
| 138 | plugin_name = OCFS2_STACK_PLUGIN_USER; |
| 139 | |
| 140 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 141 | if (rc == -ENOENT) { |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 142 | request_module("ocfs2_stack_%s", plugin_name); |
| 143 | rc = ocfs2_stack_driver_request(stack_name, plugin_name); |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | if (rc == -ENOENT) { |
| 147 | printk(KERN_ERR |
| 148 | "ocfs2: Cluster stack driver \"%s\" cannot be found\n", |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 149 | plugin_name); |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 150 | } else if (rc == -EBUSY) { |
| 151 | printk(KERN_ERR |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 152 | "ocfs2: A different cluster stack is in use\n"); |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | return rc; |
| 156 | } |
| 157 | |
| 158 | static void ocfs2_stack_driver_put(void) |
| 159 | { |
| 160 | spin_lock(&ocfs2_stack_lock); |
| 161 | BUG_ON(active_stack == NULL); |
| 162 | BUG_ON(active_stack->sp_count == 0); |
| 163 | |
| 164 | active_stack->sp_count--; |
| 165 | if (!active_stack->sp_count) { |
| 166 | module_put(active_stack->sp_owner); |
| 167 | active_stack = NULL; |
| 168 | } |
| 169 | spin_unlock(&ocfs2_stack_lock); |
| 170 | } |
| 171 | |
| 172 | int ocfs2_stack_glue_register(struct ocfs2_stack_plugin *plugin) |
| 173 | { |
| 174 | int rc; |
| 175 | |
| 176 | spin_lock(&ocfs2_stack_lock); |
| 177 | if (!ocfs2_stack_lookup(plugin->sp_name)) { |
| 178 | plugin->sp_count = 0; |
Joel Becker | e603cfb | 2010-01-29 16:06:29 -0800 | [diff] [blame^] | 179 | plugin->sp_max_proto = lproto->lp_max_version; |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 180 | list_add(&plugin->sp_list, &ocfs2_stack_list); |
| 181 | printk(KERN_INFO "ocfs2: Registered cluster interface %s\n", |
| 182 | plugin->sp_name); |
| 183 | rc = 0; |
| 184 | } else { |
| 185 | printk(KERN_ERR "ocfs2: Stack \"%s\" already registered\n", |
| 186 | plugin->sp_name); |
| 187 | rc = -EEXIST; |
| 188 | } |
| 189 | spin_unlock(&ocfs2_stack_lock); |
| 190 | |
| 191 | return rc; |
| 192 | } |
| 193 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_register); |
| 194 | |
| 195 | void ocfs2_stack_glue_unregister(struct ocfs2_stack_plugin *plugin) |
| 196 | { |
| 197 | struct ocfs2_stack_plugin *p; |
| 198 | |
| 199 | spin_lock(&ocfs2_stack_lock); |
| 200 | p = ocfs2_stack_lookup(plugin->sp_name); |
| 201 | if (p) { |
| 202 | BUG_ON(p != plugin); |
| 203 | BUG_ON(plugin == active_stack); |
| 204 | BUG_ON(plugin->sp_count != 0); |
| 205 | list_del_init(&plugin->sp_list); |
| 206 | printk(KERN_INFO "ocfs2: Unregistered cluster interface %s\n", |
| 207 | plugin->sp_name); |
| 208 | } else { |
| 209 | printk(KERN_ERR "Stack \"%s\" is not registered\n", |
| 210 | plugin->sp_name); |
| 211 | } |
| 212 | spin_unlock(&ocfs2_stack_lock); |
| 213 | } |
| 214 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_unregister); |
| 215 | |
| 216 | void ocfs2_stack_glue_set_locking_protocol(struct ocfs2_locking_protocol *proto) |
| 217 | { |
| 218 | struct ocfs2_stack_plugin *p; |
| 219 | |
| 220 | BUG_ON(proto == NULL); |
| 221 | |
| 222 | spin_lock(&ocfs2_stack_lock); |
| 223 | BUG_ON(active_stack != NULL); |
| 224 | |
| 225 | lproto = proto; |
| 226 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { |
Joel Becker | e603cfb | 2010-01-29 16:06:29 -0800 | [diff] [blame^] | 227 | p->sp_max_proto = lproto->lp_max_version; |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 228 | } |
| 229 | |
| 230 | spin_unlock(&ocfs2_stack_lock); |
| 231 | } |
| 232 | EXPORT_SYMBOL_GPL(ocfs2_stack_glue_set_locking_protocol); |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 233 | |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 234 | |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 235 | /* |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 236 | * The ocfs2_dlm_lock() and ocfs2_dlm_unlock() functions take no argument |
| 237 | * for the ast and bast functions. They will pass the lksb to the ast |
| 238 | * and bast. The caller can wrap the lksb with their own structure to |
| 239 | * get more information. |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 240 | */ |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 241 | int ocfs2_dlm_lock(struct ocfs2_cluster_connection *conn, |
| 242 | int mode, |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame] | 243 | struct ocfs2_dlm_lksb *lksb, |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 244 | u32 flags, |
| 245 | void *name, |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 246 | unsigned int namelen) |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 247 | { |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 248 | BUG_ON(lproto == NULL); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 249 | |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame] | 250 | if (!lksb->lksb_conn) |
| 251 | lksb->lksb_conn = conn; |
| 252 | else |
| 253 | BUG_ON(lksb->lksb_conn != conn); |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 254 | return active_stack->sp_ops->dlm_lock(conn, mode, lksb, flags, |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 255 | name, namelen); |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 256 | } |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 257 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock); |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 258 | |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 259 | int ocfs2_dlm_unlock(struct ocfs2_cluster_connection *conn, |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame] | 260 | struct ocfs2_dlm_lksb *lksb, |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 261 | u32 flags) |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 262 | { |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 263 | BUG_ON(lproto == NULL); |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame] | 264 | BUG_ON(lksb->lksb_conn == NULL); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 265 | |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 266 | return active_stack->sp_ops->dlm_unlock(conn, lksb, flags); |
Joel Becker | 8f2c9c1 | 2008-02-01 12:16:57 -0800 | [diff] [blame] | 267 | } |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 268 | EXPORT_SYMBOL_GPL(ocfs2_dlm_unlock); |
Joel Becker | 8f2c9c1 | 2008-02-01 12:16:57 -0800 | [diff] [blame] | 269 | |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame] | 270 | int ocfs2_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 271 | { |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 272 | return active_stack->sp_ops->lock_status(lksb); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 273 | } |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 274 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lock_status); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 275 | |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame] | 276 | int ocfs2_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
Joel Becker | 1c520df | 2009-06-19 15:14:13 -0700 | [diff] [blame] | 277 | { |
| 278 | return active_stack->sp_ops->lvb_valid(lksb); |
| 279 | } |
| 280 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb_valid); |
| 281 | |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame] | 282 | void *ocfs2_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 283 | { |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 284 | return active_stack->sp_ops->lock_lvb(lksb); |
Joel Becker | cf0acdc | 2008-01-29 16:59:55 -0800 | [diff] [blame] | 285 | } |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 286 | EXPORT_SYMBOL_GPL(ocfs2_dlm_lvb); |
Joel Becker | cf0acdc | 2008-01-29 16:59:55 -0800 | [diff] [blame] | 287 | |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame] | 288 | void ocfs2_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 289 | { |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 290 | active_stack->sp_ops->dump_lksb(lksb); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 291 | } |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 292 | EXPORT_SYMBOL_GPL(ocfs2_dlm_dump_lksb); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 293 | |
Mark Fasheh | 53da493 | 2008-07-21 14:29:16 -0700 | [diff] [blame] | 294 | int ocfs2_stack_supports_plocks(void) |
| 295 | { |
Mark Fasheh | 009d375 | 2008-10-06 16:16:08 -0700 | [diff] [blame] | 296 | return active_stack && active_stack->sp_ops->plock; |
Mark Fasheh | 53da493 | 2008-07-21 14:29:16 -0700 | [diff] [blame] | 297 | } |
| 298 | EXPORT_SYMBOL_GPL(ocfs2_stack_supports_plocks); |
| 299 | |
| 300 | /* |
| 301 | * ocfs2_plock() can only be safely called if |
| 302 | * ocfs2_stack_supports_plocks() returned true |
| 303 | */ |
| 304 | int ocfs2_plock(struct ocfs2_cluster_connection *conn, u64 ino, |
| 305 | struct file *file, int cmd, struct file_lock *fl) |
| 306 | { |
| 307 | WARN_ON_ONCE(active_stack->sp_ops->plock == NULL); |
| 308 | if (active_stack->sp_ops->plock) |
| 309 | return active_stack->sp_ops->plock(conn, ino, file, cmd, fl); |
| 310 | return -EOPNOTSUPP; |
| 311 | } |
| 312 | EXPORT_SYMBOL_GPL(ocfs2_plock); |
| 313 | |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 314 | int ocfs2_cluster_connect(const char *stack_name, |
| 315 | const char *group, |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 316 | int grouplen, |
| 317 | void (*recovery_handler)(int node_num, |
| 318 | void *recovery_data), |
| 319 | void *recovery_data, |
| 320 | struct ocfs2_cluster_connection **conn) |
| 321 | { |
| 322 | int rc = 0; |
| 323 | struct ocfs2_cluster_connection *new_conn; |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 324 | |
| 325 | BUG_ON(group == NULL); |
| 326 | BUG_ON(conn == NULL); |
| 327 | BUG_ON(recovery_handler == NULL); |
| 328 | |
| 329 | if (grouplen > GROUP_NAME_MAX) { |
| 330 | rc = -EINVAL; |
| 331 | goto out; |
| 332 | } |
| 333 | |
| 334 | new_conn = kzalloc(sizeof(struct ocfs2_cluster_connection), |
| 335 | GFP_KERNEL); |
| 336 | if (!new_conn) { |
| 337 | rc = -ENOMEM; |
| 338 | goto out; |
| 339 | } |
| 340 | |
| 341 | memcpy(new_conn->cc_name, group, grouplen); |
| 342 | new_conn->cc_namelen = grouplen; |
| 343 | new_conn->cc_recovery_handler = recovery_handler; |
| 344 | new_conn->cc_recovery_data = recovery_data; |
| 345 | |
Joel Becker | 110946c | 2010-01-29 15:46:23 -0800 | [diff] [blame] | 346 | new_conn->cc_proto = lproto; |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 347 | /* Start the new connection at our maximum compatibility level */ |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 348 | new_conn->cc_version = lproto->lp_max_version; |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 349 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 350 | /* This will pin the stack driver if successful */ |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 351 | rc = ocfs2_stack_driver_get(stack_name); |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 352 | if (rc) |
| 353 | goto out_free; |
| 354 | |
| 355 | rc = active_stack->sp_ops->connect(new_conn); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 356 | if (rc) { |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 357 | ocfs2_stack_driver_put(); |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 358 | goto out_free; |
| 359 | } |
| 360 | |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 361 | *conn = new_conn; |
| 362 | |
| 363 | out_free: |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 364 | if (rc) |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 365 | kfree(new_conn); |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 366 | |
| 367 | out: |
| 368 | return rc; |
| 369 | } |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 370 | EXPORT_SYMBOL_GPL(ocfs2_cluster_connect); |
Joel Becker | 4670c46 | 2008-02-01 14:39:35 -0800 | [diff] [blame] | 371 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 372 | /* If hangup_pending is 0, the stack driver will be dropped */ |
| 373 | int ocfs2_cluster_disconnect(struct ocfs2_cluster_connection *conn, |
| 374 | int hangup_pending) |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 375 | { |
| 376 | int ret; |
| 377 | |
| 378 | BUG_ON(conn == NULL); |
| 379 | |
Joel Becker | 2c39450 | 2008-05-30 15:58:26 -0700 | [diff] [blame] | 380 | ret = active_stack->sp_ops->disconnect(conn); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 381 | |
| 382 | /* XXX Should we free it anyway? */ |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 383 | if (!ret) { |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 384 | kfree(conn); |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 385 | if (!hangup_pending) |
| 386 | ocfs2_stack_driver_put(); |
| 387 | } |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 388 | |
| 389 | return ret; |
| 390 | } |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 391 | EXPORT_SYMBOL_GPL(ocfs2_cluster_disconnect); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 392 | |
Joel Becker | 9f9a99f | 2008-05-30 15:43:58 -0700 | [diff] [blame] | 393 | /* |
| 394 | * Leave the group for this filesystem. This is executed by a userspace |
| 395 | * program (stored in ocfs2_hb_ctl_path). |
| 396 | */ |
| 397 | static void ocfs2_leave_group(const char *group) |
| 398 | { |
| 399 | int ret; |
| 400 | char *argv[5], *envp[3]; |
| 401 | |
| 402 | argv[0] = ocfs2_hb_ctl_path; |
| 403 | argv[1] = "-K"; |
| 404 | argv[2] = "-u"; |
| 405 | argv[3] = (char *)group; |
| 406 | argv[4] = NULL; |
| 407 | |
| 408 | /* minimal command environment taken from cpu_run_sbin_hotplug */ |
| 409 | envp[0] = "HOME=/"; |
| 410 | envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin"; |
| 411 | envp[2] = NULL; |
| 412 | |
| 413 | ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC); |
| 414 | if (ret < 0) { |
| 415 | printk(KERN_ERR |
| 416 | "ocfs2: Error %d running user helper " |
| 417 | "\"%s %s %s %s\"\n", |
| 418 | ret, argv[0], argv[1], argv[2], argv[3]); |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | /* |
| 423 | * Hangup is a required post-umount. ocfs2-tools software expects the |
| 424 | * filesystem to call "ocfs2_hb_ctl" during unmount. This happens |
| 425 | * regardless of whether the DLM got started, so we can't do it |
| 426 | * in ocfs2_cluster_disconnect(). The ocfs2_leave_group() function does |
| 427 | * the actual work. |
| 428 | */ |
Joel Becker | 6953b4c | 2008-01-29 16:59:56 -0800 | [diff] [blame] | 429 | void ocfs2_cluster_hangup(const char *group, int grouplen) |
| 430 | { |
| 431 | BUG_ON(group == NULL); |
| 432 | BUG_ON(group[grouplen] != '\0'); |
| 433 | |
Joel Becker | 9f9a99f | 2008-05-30 15:43:58 -0700 | [diff] [blame] | 434 | ocfs2_leave_group(group); |
| 435 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 436 | /* cluster_disconnect() was called with hangup_pending==1 */ |
| 437 | ocfs2_stack_driver_put(); |
Joel Becker | 19fdb62 | 2008-01-30 15:38:24 -0800 | [diff] [blame] | 438 | } |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 439 | EXPORT_SYMBOL_GPL(ocfs2_cluster_hangup); |
Joel Becker | 19fdb62 | 2008-01-30 15:38:24 -0800 | [diff] [blame] | 440 | |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 441 | int ocfs2_cluster_this_node(unsigned int *node) |
| 442 | { |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 443 | return active_stack->sp_ops->this_node(node); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 444 | } |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 445 | EXPORT_SYMBOL_GPL(ocfs2_cluster_this_node); |
Joel Becker | 553aa7e | 2008-02-01 14:51:03 -0800 | [diff] [blame] | 446 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 447 | |
Joel Becker | 74ae4e1 | 2008-01-31 23:56:17 -0800 | [diff] [blame] | 448 | /* |
| 449 | * Sysfs bits |
| 450 | */ |
| 451 | |
| 452 | static ssize_t ocfs2_max_locking_protocol_show(struct kobject *kobj, |
| 453 | struct kobj_attribute *attr, |
| 454 | char *buf) |
| 455 | { |
| 456 | ssize_t ret = 0; |
| 457 | |
| 458 | spin_lock(&ocfs2_stack_lock); |
| 459 | if (lproto) |
| 460 | ret = snprintf(buf, PAGE_SIZE, "%u.%u\n", |
| 461 | lproto->lp_max_version.pv_major, |
| 462 | lproto->lp_max_version.pv_minor); |
| 463 | spin_unlock(&ocfs2_stack_lock); |
| 464 | |
| 465 | return ret; |
| 466 | } |
| 467 | |
| 468 | static struct kobj_attribute ocfs2_attr_max_locking_protocol = |
| 469 | __ATTR(max_locking_protocol, S_IFREG | S_IRUGO, |
| 470 | ocfs2_max_locking_protocol_show, NULL); |
| 471 | |
| 472 | static ssize_t ocfs2_loaded_cluster_plugins_show(struct kobject *kobj, |
| 473 | struct kobj_attribute *attr, |
| 474 | char *buf) |
| 475 | { |
| 476 | ssize_t ret = 0, total = 0, remain = PAGE_SIZE; |
| 477 | struct ocfs2_stack_plugin *p; |
| 478 | |
| 479 | spin_lock(&ocfs2_stack_lock); |
| 480 | list_for_each_entry(p, &ocfs2_stack_list, sp_list) { |
| 481 | ret = snprintf(buf, remain, "%s\n", |
| 482 | p->sp_name); |
| 483 | if (ret < 0) { |
| 484 | total = ret; |
| 485 | break; |
| 486 | } |
| 487 | if (ret == remain) { |
| 488 | /* snprintf() didn't fit */ |
| 489 | total = -E2BIG; |
| 490 | break; |
| 491 | } |
| 492 | total += ret; |
| 493 | remain -= ret; |
| 494 | } |
| 495 | spin_unlock(&ocfs2_stack_lock); |
| 496 | |
| 497 | return total; |
| 498 | } |
| 499 | |
| 500 | static struct kobj_attribute ocfs2_attr_loaded_cluster_plugins = |
| 501 | __ATTR(loaded_cluster_plugins, S_IFREG | S_IRUGO, |
| 502 | ocfs2_loaded_cluster_plugins_show, NULL); |
| 503 | |
| 504 | static ssize_t ocfs2_active_cluster_plugin_show(struct kobject *kobj, |
| 505 | struct kobj_attribute *attr, |
| 506 | char *buf) |
| 507 | { |
| 508 | ssize_t ret = 0; |
| 509 | |
| 510 | spin_lock(&ocfs2_stack_lock); |
| 511 | if (active_stack) { |
| 512 | ret = snprintf(buf, PAGE_SIZE, "%s\n", |
| 513 | active_stack->sp_name); |
| 514 | if (ret == PAGE_SIZE) |
| 515 | ret = -E2BIG; |
| 516 | } |
| 517 | spin_unlock(&ocfs2_stack_lock); |
| 518 | |
| 519 | return ret; |
| 520 | } |
| 521 | |
| 522 | static struct kobj_attribute ocfs2_attr_active_cluster_plugin = |
| 523 | __ATTR(active_cluster_plugin, S_IFREG | S_IRUGO, |
| 524 | ocfs2_active_cluster_plugin_show, NULL); |
| 525 | |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 526 | static ssize_t ocfs2_cluster_stack_show(struct kobject *kobj, |
| 527 | struct kobj_attribute *attr, |
| 528 | char *buf) |
| 529 | { |
| 530 | ssize_t ret; |
| 531 | spin_lock(&ocfs2_stack_lock); |
| 532 | ret = snprintf(buf, PAGE_SIZE, "%s\n", cluster_stack_name); |
| 533 | spin_unlock(&ocfs2_stack_lock); |
| 534 | |
| 535 | return ret; |
| 536 | } |
| 537 | |
| 538 | static ssize_t ocfs2_cluster_stack_store(struct kobject *kobj, |
| 539 | struct kobj_attribute *attr, |
| 540 | const char *buf, size_t count) |
| 541 | { |
| 542 | size_t len = count; |
| 543 | ssize_t ret; |
| 544 | |
| 545 | if (len == 0) |
| 546 | return len; |
| 547 | |
| 548 | if (buf[len - 1] == '\n') |
| 549 | len--; |
| 550 | |
| 551 | if ((len != OCFS2_STACK_LABEL_LEN) || |
| 552 | (strnlen(buf, len) != len)) |
| 553 | return -EINVAL; |
| 554 | |
| 555 | spin_lock(&ocfs2_stack_lock); |
| 556 | if (active_stack) { |
| 557 | if (!strncmp(buf, cluster_stack_name, len)) |
| 558 | ret = count; |
| 559 | else |
| 560 | ret = -EBUSY; |
| 561 | } else { |
| 562 | memcpy(cluster_stack_name, buf, len); |
| 563 | ret = count; |
| 564 | } |
| 565 | spin_unlock(&ocfs2_stack_lock); |
| 566 | |
| 567 | return ret; |
| 568 | } |
| 569 | |
| 570 | |
| 571 | static struct kobj_attribute ocfs2_attr_cluster_stack = |
| 572 | __ATTR(cluster_stack, S_IFREG | S_IRUGO | S_IWUSR, |
| 573 | ocfs2_cluster_stack_show, |
| 574 | ocfs2_cluster_stack_store); |
| 575 | |
Joel Becker | 74ae4e1 | 2008-01-31 23:56:17 -0800 | [diff] [blame] | 576 | static struct attribute *ocfs2_attrs[] = { |
| 577 | &ocfs2_attr_max_locking_protocol.attr, |
| 578 | &ocfs2_attr_loaded_cluster_plugins.attr, |
| 579 | &ocfs2_attr_active_cluster_plugin.attr, |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 580 | &ocfs2_attr_cluster_stack.attr, |
Joel Becker | 74ae4e1 | 2008-01-31 23:56:17 -0800 | [diff] [blame] | 581 | NULL, |
| 582 | }; |
| 583 | |
| 584 | static struct attribute_group ocfs2_attr_group = { |
| 585 | .attrs = ocfs2_attrs, |
| 586 | }; |
| 587 | |
| 588 | static struct kset *ocfs2_kset; |
| 589 | |
| 590 | static void ocfs2_sysfs_exit(void) |
| 591 | { |
| 592 | kset_unregister(ocfs2_kset); |
| 593 | } |
| 594 | |
| 595 | static int ocfs2_sysfs_init(void) |
| 596 | { |
| 597 | int ret; |
| 598 | |
| 599 | ocfs2_kset = kset_create_and_add("ocfs2", NULL, fs_kobj); |
| 600 | if (!ocfs2_kset) |
| 601 | return -ENOMEM; |
| 602 | |
| 603 | ret = sysfs_create_group(&ocfs2_kset->kobj, &ocfs2_attr_group); |
| 604 | if (ret) |
| 605 | goto error; |
| 606 | |
| 607 | return 0; |
| 608 | |
| 609 | error: |
| 610 | kset_unregister(ocfs2_kset); |
| 611 | return ret; |
| 612 | } |
| 613 | |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 614 | /* |
| 615 | * Sysctl bits |
| 616 | * |
| 617 | * The sysctl lives at /proc/sys/fs/ocfs2/nm/hb_ctl_path. The 'nm' doesn't |
| 618 | * make as much sense in a multiple cluster stack world, but it's safer |
| 619 | * and easier to preserve the name. |
| 620 | */ |
| 621 | |
| 622 | #define FS_OCFS2_NM 1 |
| 623 | |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 624 | static ctl_table ocfs2_nm_table[] = { |
| 625 | { |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 626 | .procname = "hb_ctl_path", |
| 627 | .data = ocfs2_hb_ctl_path, |
| 628 | .maxlen = OCFS2_MAX_HB_CTL_PATH, |
| 629 | .mode = 0644, |
Eric W. Biederman | 6d45611 | 2009-11-16 03:11:48 -0800 | [diff] [blame] | 630 | .proc_handler = proc_dostring, |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 631 | }, |
Eric W. Biederman | ab09203 | 2009-11-05 14:25:10 -0800 | [diff] [blame] | 632 | { } |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 633 | }; |
| 634 | |
| 635 | static ctl_table ocfs2_mod_table[] = { |
| 636 | { |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 637 | .procname = "nm", |
| 638 | .data = NULL, |
| 639 | .maxlen = 0, |
| 640 | .mode = 0555, |
| 641 | .child = ocfs2_nm_table |
| 642 | }, |
Eric W. Biederman | ab09203 | 2009-11-05 14:25:10 -0800 | [diff] [blame] | 643 | { } |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 644 | }; |
| 645 | |
| 646 | static ctl_table ocfs2_kern_table[] = { |
| 647 | { |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 648 | .procname = "ocfs2", |
| 649 | .data = NULL, |
| 650 | .maxlen = 0, |
| 651 | .mode = 0555, |
| 652 | .child = ocfs2_mod_table |
| 653 | }, |
Eric W. Biederman | ab09203 | 2009-11-05 14:25:10 -0800 | [diff] [blame] | 654 | { } |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 655 | }; |
| 656 | |
| 657 | static ctl_table ocfs2_root_table[] = { |
| 658 | { |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 659 | .procname = "fs", |
| 660 | .data = NULL, |
| 661 | .maxlen = 0, |
| 662 | .mode = 0555, |
| 663 | .child = ocfs2_kern_table |
| 664 | }, |
Eric W. Biederman | ab09203 | 2009-11-05 14:25:10 -0800 | [diff] [blame] | 665 | { } |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 666 | }; |
| 667 | |
| 668 | static struct ctl_table_header *ocfs2_table_header = NULL; |
| 669 | |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 670 | |
| 671 | /* |
| 672 | * Initialization |
| 673 | */ |
| 674 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 675 | static int __init ocfs2_stack_glue_init(void) |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 676 | { |
Joel Becker | 9c6c877 | 2008-02-01 15:17:30 -0800 | [diff] [blame] | 677 | strcpy(cluster_stack_name, OCFS2_STACK_PLUGIN_O2CB); |
| 678 | |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 679 | ocfs2_table_header = register_sysctl_table(ocfs2_root_table); |
| 680 | if (!ocfs2_table_header) { |
| 681 | printk(KERN_ERR |
| 682 | "ocfs2 stack glue: unable to register sysctl\n"); |
| 683 | return -ENOMEM; /* or something. */ |
| 684 | } |
| 685 | |
Joel Becker | 74ae4e1 | 2008-01-31 23:56:17 -0800 | [diff] [blame] | 686 | return ocfs2_sysfs_init(); |
Joel Becker | 24ef181 | 2008-01-29 17:37:32 -0800 | [diff] [blame] | 687 | } |
| 688 | |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 689 | static void __exit ocfs2_stack_glue_exit(void) |
| 690 | { |
| 691 | lproto = NULL; |
Joel Becker | 74ae4e1 | 2008-01-31 23:56:17 -0800 | [diff] [blame] | 692 | ocfs2_sysfs_exit(); |
Joel Becker | 3878f11 | 2008-05-30 15:30:49 -0700 | [diff] [blame] | 693 | if (ocfs2_table_header) |
| 694 | unregister_sysctl_table(ocfs2_table_header); |
Joel Becker | 286eaa9 | 2008-02-01 15:03:57 -0800 | [diff] [blame] | 695 | } |
| 696 | |
| 697 | MODULE_AUTHOR("Oracle"); |
| 698 | MODULE_DESCRIPTION("ocfs2 cluter stack glue layer"); |
| 699 | MODULE_LICENSE("GPL"); |
| 700 | module_init(ocfs2_stack_glue_init); |
| 701 | module_exit(ocfs2_stack_glue_exit); |