Joel Becker | 8adf053 | 2007-11-28 14:38:40 -0800 | [diff] [blame] | 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * stack_user.c |
| 5 | * |
| 6 | * Code which interfaces ocfs2 with fs/dlm and a userspace stack. |
| 7 | * |
| 8 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public |
| 12 | * License as published by the Free Software Foundation, version 2. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 21 | #include <linux/fs.h> |
| 22 | #include <linux/miscdevice.h> |
| 23 | #include <linux/mutex.h> |
Arnd Bergmann | b7fdf9f | 2008-05-20 19:16:28 +0200 | [diff] [blame] | 24 | #include <linux/smp_lock.h> |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 25 | #include <linux/reboot.h> |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 26 | #include <asm/uaccess.h> |
Joel Becker | 8adf053 | 2007-11-28 14:38:40 -0800 | [diff] [blame] | 27 | |
| 28 | #include "stackglue.h" |
| 29 | |
Mark Fasheh | 53da493 | 2008-07-21 14:29:16 -0700 | [diff] [blame] | 30 | #include <linux/dlm_plock.h> |
Joel Becker | 8adf053 | 2007-11-28 14:38:40 -0800 | [diff] [blame] | 31 | |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 32 | /* |
| 33 | * The control protocol starts with a handshake. Until the handshake |
| 34 | * is complete, the control device will fail all write(2)s. |
| 35 | * |
| 36 | * The handshake is simple. First, the client reads until EOF. Each line |
| 37 | * of output is a supported protocol tag. All protocol tags are a single |
| 38 | * character followed by a two hex digit version number. Currently the |
| 39 | * only things supported is T01, for "Text-base version 0x01". Next, the |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 40 | * client writes the version they would like to use, including the newline. |
| 41 | * Thus, the protocol tag is 'T01\n'. If the version tag written is |
| 42 | * unknown, -EINVAL is returned. Once the negotiation is complete, the |
| 43 | * client can start sending messages. |
| 44 | * |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 45 | * The T01 protocol has three messages. First is the "SETN" message. |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 46 | * It has the following syntax: |
| 47 | * |
| 48 | * SETN<space><8-char-hex-nodenum><newline> |
| 49 | * |
| 50 | * This is 14 characters. |
| 51 | * |
| 52 | * The "SETN" message must be the first message following the protocol. |
| 53 | * It tells ocfs2_control the local node number. |
| 54 | * |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 55 | * Next comes the "SETV" message. It has the following syntax: |
| 56 | * |
| 57 | * SETV<space><2-char-hex-major><space><2-char-hex-minor><newline> |
| 58 | * |
| 59 | * This is 11 characters. |
| 60 | * |
| 61 | * The "SETV" message sets the filesystem locking protocol version as |
| 62 | * negotiated by the client. The client negotiates based on the maximum |
| 63 | * version advertised in /sys/fs/ocfs2/max_locking_protocol. The major |
| 64 | * number from the "SETV" message must match |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 65 | * ocfs2_user_plugin.sp_proto->lp_max_version.pv_major, and the minor number |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 66 | * must be less than or equal to ...->lp_max_version.pv_minor. |
| 67 | * |
| 68 | * Once this information has been set, mounts will be allowed. From this |
| 69 | * point on, the "DOWN" message can be sent for node down notification. |
| 70 | * It has the following syntax: |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 71 | * |
| 72 | * DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> |
| 73 | * |
| 74 | * eg: |
| 75 | * |
| 76 | * DOWN 632A924FDD844190BDA93C0DF6B94899 00000001\n |
| 77 | * |
| 78 | * This is 47 characters. |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 79 | */ |
| 80 | |
| 81 | /* |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 82 | * Whether or not the client has done the handshake. |
| 83 | * For now, we have just one protocol version. |
| 84 | */ |
| 85 | #define OCFS2_CONTROL_PROTO "T01\n" |
| 86 | #define OCFS2_CONTROL_PROTO_LEN 4 |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 87 | |
| 88 | /* Handshake states */ |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 89 | #define OCFS2_CONTROL_HANDSHAKE_INVALID (0) |
| 90 | #define OCFS2_CONTROL_HANDSHAKE_READ (1) |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 91 | #define OCFS2_CONTROL_HANDSHAKE_PROTOCOL (2) |
| 92 | #define OCFS2_CONTROL_HANDSHAKE_VALID (3) |
| 93 | |
| 94 | /* Messages */ |
| 95 | #define OCFS2_CONTROL_MESSAGE_OP_LEN 4 |
| 96 | #define OCFS2_CONTROL_MESSAGE_SETNODE_OP "SETN" |
| 97 | #define OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN 14 |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 98 | #define OCFS2_CONTROL_MESSAGE_SETVERSION_OP "SETV" |
| 99 | #define OCFS2_CONTROL_MESSAGE_SETVERSION_TOTAL_LEN 11 |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 100 | #define OCFS2_CONTROL_MESSAGE_DOWN_OP "DOWN" |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 101 | #define OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN 47 |
| 102 | #define OCFS2_TEXT_UUID_LEN 32 |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 103 | #define OCFS2_CONTROL_MESSAGE_VERNUM_LEN 2 |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 104 | #define OCFS2_CONTROL_MESSAGE_NODENUM_LEN 8 |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 105 | |
| 106 | /* |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 107 | * ocfs2_live_connection is refcounted because the filesystem and |
| 108 | * miscdevice sides can detach in different order. Let's just be safe. |
| 109 | */ |
| 110 | struct ocfs2_live_connection { |
| 111 | struct list_head oc_list; |
| 112 | struct ocfs2_cluster_connection *oc_conn; |
| 113 | }; |
| 114 | |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 115 | struct ocfs2_control_private { |
| 116 | struct list_head op_list; |
| 117 | int op_state; |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 118 | int op_this_node; |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 119 | struct ocfs2_protocol_version op_proto; |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 120 | }; |
| 121 | |
| 122 | /* SETN<space><8-char-hex-nodenum><newline> */ |
| 123 | struct ocfs2_control_message_setn { |
| 124 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; |
| 125 | char space; |
| 126 | char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN]; |
| 127 | char newline; |
| 128 | }; |
| 129 | |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 130 | /* SETV<space><2-char-hex-major><space><2-char-hex-minor><newline> */ |
| 131 | struct ocfs2_control_message_setv { |
| 132 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; |
| 133 | char space1; |
| 134 | char major[OCFS2_CONTROL_MESSAGE_VERNUM_LEN]; |
| 135 | char space2; |
| 136 | char minor[OCFS2_CONTROL_MESSAGE_VERNUM_LEN]; |
| 137 | char newline; |
| 138 | }; |
| 139 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 140 | /* DOWN<space><32-char-cap-hex-uuid><space><8-char-hex-nodenum><newline> */ |
| 141 | struct ocfs2_control_message_down { |
| 142 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; |
| 143 | char space1; |
| 144 | char uuid[OCFS2_TEXT_UUID_LEN]; |
| 145 | char space2; |
| 146 | char nodestr[OCFS2_CONTROL_MESSAGE_NODENUM_LEN]; |
| 147 | char newline; |
| 148 | }; |
| 149 | |
| 150 | union ocfs2_control_message { |
| 151 | char tag[OCFS2_CONTROL_MESSAGE_OP_LEN]; |
| 152 | struct ocfs2_control_message_setn u_setn; |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 153 | struct ocfs2_control_message_setv u_setv; |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 154 | struct ocfs2_control_message_down u_down; |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 155 | }; |
| 156 | |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 157 | static struct ocfs2_stack_plugin ocfs2_user_plugin; |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 158 | |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 159 | static atomic_t ocfs2_control_opened; |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 160 | static int ocfs2_control_this_node = -1; |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 161 | static struct ocfs2_protocol_version running_proto; |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 162 | |
| 163 | static LIST_HEAD(ocfs2_live_connection_list); |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 164 | static LIST_HEAD(ocfs2_control_private_list); |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 165 | static DEFINE_MUTEX(ocfs2_control_lock); |
| 166 | |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 167 | static inline void ocfs2_control_set_handshake_state(struct file *file, |
| 168 | int state) |
| 169 | { |
| 170 | struct ocfs2_control_private *p = file->private_data; |
| 171 | p->op_state = state; |
| 172 | } |
| 173 | |
| 174 | static inline int ocfs2_control_get_handshake_state(struct file *file) |
| 175 | { |
| 176 | struct ocfs2_control_private *p = file->private_data; |
| 177 | return p->op_state; |
| 178 | } |
| 179 | |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 180 | static struct ocfs2_live_connection *ocfs2_connection_find(const char *name) |
| 181 | { |
| 182 | size_t len = strlen(name); |
| 183 | struct ocfs2_live_connection *c; |
| 184 | |
| 185 | BUG_ON(!mutex_is_locked(&ocfs2_control_lock)); |
| 186 | |
| 187 | list_for_each_entry(c, &ocfs2_live_connection_list, oc_list) { |
| 188 | if ((c->oc_conn->cc_namelen == len) && |
| 189 | !strncmp(c->oc_conn->cc_name, name, len)) |
| 190 | return c; |
| 191 | } |
| 192 | |
| 193 | return c; |
| 194 | } |
| 195 | |
| 196 | /* |
| 197 | * ocfs2_live_connection structures are created underneath the ocfs2 |
| 198 | * mount path. Since the VFS prevents multiple calls to |
| 199 | * fill_super(), we can't get dupes here. |
| 200 | */ |
| 201 | static int ocfs2_live_connection_new(struct ocfs2_cluster_connection *conn, |
| 202 | struct ocfs2_live_connection **c_ret) |
| 203 | { |
| 204 | int rc = 0; |
| 205 | struct ocfs2_live_connection *c; |
| 206 | |
| 207 | c = kzalloc(sizeof(struct ocfs2_live_connection), GFP_KERNEL); |
| 208 | if (!c) |
| 209 | return -ENOMEM; |
| 210 | |
| 211 | mutex_lock(&ocfs2_control_lock); |
| 212 | c->oc_conn = conn; |
| 213 | |
| 214 | if (atomic_read(&ocfs2_control_opened)) |
| 215 | list_add(&c->oc_list, &ocfs2_live_connection_list); |
| 216 | else { |
| 217 | printk(KERN_ERR |
| 218 | "ocfs2: Userspace control daemon is not present\n"); |
| 219 | rc = -ESRCH; |
| 220 | } |
| 221 | |
| 222 | mutex_unlock(&ocfs2_control_lock); |
| 223 | |
| 224 | if (!rc) |
| 225 | *c_ret = c; |
| 226 | else |
| 227 | kfree(c); |
| 228 | |
| 229 | return rc; |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * This function disconnects the cluster connection from ocfs2_control. |
| 234 | * Afterwards, userspace can't affect the cluster connection. |
| 235 | */ |
| 236 | static void ocfs2_live_connection_drop(struct ocfs2_live_connection *c) |
| 237 | { |
| 238 | mutex_lock(&ocfs2_control_lock); |
| 239 | list_del_init(&c->oc_list); |
| 240 | c->oc_conn = NULL; |
| 241 | mutex_unlock(&ocfs2_control_lock); |
| 242 | |
| 243 | kfree(c); |
| 244 | } |
| 245 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 246 | static int ocfs2_control_cfu(void *target, size_t target_len, |
| 247 | const char __user *buf, size_t count) |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 248 | { |
| 249 | /* The T01 expects write(2) calls to have exactly one command */ |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 250 | if ((count != target_len) || |
| 251 | (count > sizeof(union ocfs2_control_message))) |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 252 | return -EINVAL; |
| 253 | |
| 254 | if (copy_from_user(target, buf, target_len)) |
| 255 | return -EFAULT; |
| 256 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 257 | return 0; |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 258 | } |
| 259 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 260 | static ssize_t ocfs2_control_validate_protocol(struct file *file, |
| 261 | const char __user *buf, |
| 262 | size_t count) |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 263 | { |
| 264 | ssize_t ret; |
| 265 | char kbuf[OCFS2_CONTROL_PROTO_LEN]; |
| 266 | |
| 267 | ret = ocfs2_control_cfu(kbuf, OCFS2_CONTROL_PROTO_LEN, |
| 268 | buf, count); |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 269 | if (ret) |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 270 | return ret; |
| 271 | |
| 272 | if (strncmp(kbuf, OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN)) |
| 273 | return -EINVAL; |
| 274 | |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 275 | ocfs2_control_set_handshake_state(file, |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 276 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL); |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 277 | |
| 278 | return count; |
| 279 | } |
| 280 | |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 281 | static void ocfs2_control_send_down(const char *uuid, |
| 282 | int nodenum) |
| 283 | { |
| 284 | struct ocfs2_live_connection *c; |
| 285 | |
| 286 | mutex_lock(&ocfs2_control_lock); |
| 287 | |
| 288 | c = ocfs2_connection_find(uuid); |
| 289 | if (c) { |
| 290 | BUG_ON(c->oc_conn == NULL); |
| 291 | c->oc_conn->cc_recovery_handler(nodenum, |
| 292 | c->oc_conn->cc_recovery_data); |
| 293 | } |
| 294 | |
| 295 | mutex_unlock(&ocfs2_control_lock); |
| 296 | } |
| 297 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 298 | /* |
| 299 | * Called whenever configuration elements are sent to /dev/ocfs2_control. |
| 300 | * If all configuration elements are present, try to set the global |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 301 | * values. If there is a problem, return an error. Skip any missing |
| 302 | * elements, and only bump ocfs2_control_opened when we have all elements |
| 303 | * and are successful. |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 304 | */ |
| 305 | static int ocfs2_control_install_private(struct file *file) |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 306 | { |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 307 | int rc = 0; |
| 308 | int set_p = 1; |
| 309 | struct ocfs2_control_private *p = file->private_data; |
| 310 | |
| 311 | BUG_ON(p->op_state != OCFS2_CONTROL_HANDSHAKE_PROTOCOL); |
| 312 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 313 | mutex_lock(&ocfs2_control_lock); |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 314 | |
| 315 | if (p->op_this_node < 0) { |
| 316 | set_p = 0; |
| 317 | } else if ((ocfs2_control_this_node >= 0) && |
| 318 | (ocfs2_control_this_node != p->op_this_node)) { |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 319 | rc = -EINVAL; |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 320 | goto out_unlock; |
| 321 | } |
| 322 | |
| 323 | if (!p->op_proto.pv_major) { |
| 324 | set_p = 0; |
| 325 | } else if (!list_empty(&ocfs2_live_connection_list) && |
| 326 | ((running_proto.pv_major != p->op_proto.pv_major) || |
| 327 | (running_proto.pv_minor != p->op_proto.pv_minor))) { |
| 328 | rc = -EINVAL; |
| 329 | goto out_unlock; |
| 330 | } |
| 331 | |
| 332 | if (set_p) { |
| 333 | ocfs2_control_this_node = p->op_this_node; |
| 334 | running_proto.pv_major = p->op_proto.pv_major; |
| 335 | running_proto.pv_minor = p->op_proto.pv_minor; |
| 336 | } |
| 337 | |
| 338 | out_unlock: |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 339 | mutex_unlock(&ocfs2_control_lock); |
| 340 | |
| 341 | if (!rc && set_p) { |
| 342 | /* We set the global values successfully */ |
| 343 | atomic_inc(&ocfs2_control_opened); |
| 344 | ocfs2_control_set_handshake_state(file, |
| 345 | OCFS2_CONTROL_HANDSHAKE_VALID); |
| 346 | } |
| 347 | |
| 348 | return rc; |
| 349 | } |
| 350 | |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 351 | static int ocfs2_control_get_this_node(void) |
| 352 | { |
| 353 | int rc; |
| 354 | |
| 355 | mutex_lock(&ocfs2_control_lock); |
| 356 | if (ocfs2_control_this_node < 0) |
| 357 | rc = -EINVAL; |
| 358 | else |
| 359 | rc = ocfs2_control_this_node; |
| 360 | mutex_unlock(&ocfs2_control_lock); |
| 361 | |
| 362 | return rc; |
| 363 | } |
| 364 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 365 | static int ocfs2_control_do_setnode_msg(struct file *file, |
| 366 | struct ocfs2_control_message_setn *msg) |
| 367 | { |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 368 | long nodenum; |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 369 | char *ptr = NULL; |
| 370 | struct ocfs2_control_private *p = file->private_data; |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 371 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 372 | if (ocfs2_control_get_handshake_state(file) != |
| 373 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL) |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 374 | return -EINVAL; |
| 375 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 376 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP, |
| 377 | OCFS2_CONTROL_MESSAGE_OP_LEN)) |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 378 | return -EINVAL; |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 379 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 380 | if ((msg->space != ' ') || (msg->newline != '\n')) |
| 381 | return -EINVAL; |
| 382 | msg->space = msg->newline = '\0'; |
| 383 | |
| 384 | nodenum = simple_strtol(msg->nodestr, &ptr, 16); |
| 385 | if (!ptr || *ptr) |
| 386 | return -EINVAL; |
| 387 | |
| 388 | if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) || |
| 389 | (nodenum > INT_MAX) || (nodenum < 0)) |
| 390 | return -ERANGE; |
| 391 | p->op_this_node = nodenum; |
| 392 | |
| 393 | return ocfs2_control_install_private(file); |
| 394 | } |
| 395 | |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 396 | static int ocfs2_control_do_setversion_msg(struct file *file, |
| 397 | struct ocfs2_control_message_setv *msg) |
| 398 | { |
| 399 | long major, minor; |
| 400 | char *ptr = NULL; |
| 401 | struct ocfs2_control_private *p = file->private_data; |
| 402 | struct ocfs2_protocol_version *max = |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 403 | &ocfs2_user_plugin.sp_proto->lp_max_version; |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 404 | |
| 405 | if (ocfs2_control_get_handshake_state(file) != |
| 406 | OCFS2_CONTROL_HANDSHAKE_PROTOCOL) |
| 407 | return -EINVAL; |
| 408 | |
| 409 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_SETVERSION_OP, |
| 410 | OCFS2_CONTROL_MESSAGE_OP_LEN)) |
| 411 | return -EINVAL; |
| 412 | |
| 413 | if ((msg->space1 != ' ') || (msg->space2 != ' ') || |
| 414 | (msg->newline != '\n')) |
| 415 | return -EINVAL; |
| 416 | msg->space1 = msg->space2 = msg->newline = '\0'; |
| 417 | |
| 418 | major = simple_strtol(msg->major, &ptr, 16); |
| 419 | if (!ptr || *ptr) |
| 420 | return -EINVAL; |
| 421 | minor = simple_strtol(msg->minor, &ptr, 16); |
| 422 | if (!ptr || *ptr) |
| 423 | return -EINVAL; |
| 424 | |
| 425 | /* |
| 426 | * The major must be between 1 and 255, inclusive. The minor |
| 427 | * must be between 0 and 255, inclusive. The version passed in |
| 428 | * must be within the maximum version supported by the filesystem. |
| 429 | */ |
| 430 | if ((major == LONG_MIN) || (major == LONG_MAX) || |
| 431 | (major > (u8)-1) || (major < 1)) |
| 432 | return -ERANGE; |
| 433 | if ((minor == LONG_MIN) || (minor == LONG_MAX) || |
| 434 | (minor > (u8)-1) || (minor < 0)) |
| 435 | return -ERANGE; |
| 436 | if ((major != max->pv_major) || |
| 437 | (minor > max->pv_minor)) |
| 438 | return -EINVAL; |
| 439 | |
| 440 | p->op_proto.pv_major = major; |
| 441 | p->op_proto.pv_minor = minor; |
| 442 | |
| 443 | return ocfs2_control_install_private(file); |
| 444 | } |
| 445 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 446 | static int ocfs2_control_do_down_msg(struct file *file, |
| 447 | struct ocfs2_control_message_down *msg) |
| 448 | { |
| 449 | long nodenum; |
| 450 | char *p = NULL; |
| 451 | |
| 452 | if (ocfs2_control_get_handshake_state(file) != |
| 453 | OCFS2_CONTROL_HANDSHAKE_VALID) |
| 454 | return -EINVAL; |
| 455 | |
| 456 | if (strncmp(msg->tag, OCFS2_CONTROL_MESSAGE_DOWN_OP, |
| 457 | OCFS2_CONTROL_MESSAGE_OP_LEN)) |
| 458 | return -EINVAL; |
| 459 | |
| 460 | if ((msg->space1 != ' ') || (msg->space2 != ' ') || |
| 461 | (msg->newline != '\n')) |
| 462 | return -EINVAL; |
| 463 | msg->space1 = msg->space2 = msg->newline = '\0'; |
| 464 | |
| 465 | nodenum = simple_strtol(msg->nodestr, &p, 16); |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 466 | if (!p || *p) |
| 467 | return -EINVAL; |
| 468 | |
| 469 | if ((nodenum == LONG_MIN) || (nodenum == LONG_MAX) || |
| 470 | (nodenum > INT_MAX) || (nodenum < 0)) |
| 471 | return -ERANGE; |
| 472 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 473 | ocfs2_control_send_down(msg->uuid, nodenum); |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 474 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | static ssize_t ocfs2_control_message(struct file *file, |
| 479 | const char __user *buf, |
| 480 | size_t count) |
| 481 | { |
| 482 | ssize_t ret; |
| 483 | union ocfs2_control_message msg; |
| 484 | |
| 485 | /* Try to catch padding issues */ |
| 486 | WARN_ON(offsetof(struct ocfs2_control_message_down, uuid) != |
| 487 | (sizeof(msg.u_down.tag) + sizeof(msg.u_down.space1))); |
| 488 | |
| 489 | memset(&msg, 0, sizeof(union ocfs2_control_message)); |
| 490 | ret = ocfs2_control_cfu(&msg, count, buf, count); |
| 491 | if (ret) |
| 492 | goto out; |
| 493 | |
| 494 | if ((count == OCFS2_CONTROL_MESSAGE_SETNODE_TOTAL_LEN) && |
| 495 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_SETNODE_OP, |
| 496 | OCFS2_CONTROL_MESSAGE_OP_LEN)) |
| 497 | ret = ocfs2_control_do_setnode_msg(file, &msg.u_setn); |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 498 | else if ((count == OCFS2_CONTROL_MESSAGE_SETVERSION_TOTAL_LEN) && |
| 499 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_SETVERSION_OP, |
| 500 | OCFS2_CONTROL_MESSAGE_OP_LEN)) |
| 501 | ret = ocfs2_control_do_setversion_msg(file, &msg.u_setv); |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 502 | else if ((count == OCFS2_CONTROL_MESSAGE_DOWN_TOTAL_LEN) && |
| 503 | !strncmp(msg.tag, OCFS2_CONTROL_MESSAGE_DOWN_OP, |
| 504 | OCFS2_CONTROL_MESSAGE_OP_LEN)) |
| 505 | ret = ocfs2_control_do_down_msg(file, &msg.u_down); |
| 506 | else |
| 507 | ret = -EINVAL; |
| 508 | |
| 509 | out: |
| 510 | return ret ? ret : count; |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 511 | } |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 512 | |
| 513 | static ssize_t ocfs2_control_write(struct file *file, |
| 514 | const char __user *buf, |
| 515 | size_t count, |
| 516 | loff_t *ppos) |
Joel Becker | 8adf053 | 2007-11-28 14:38:40 -0800 | [diff] [blame] | 517 | { |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 518 | ssize_t ret; |
| 519 | |
| 520 | switch (ocfs2_control_get_handshake_state(file)) { |
| 521 | case OCFS2_CONTROL_HANDSHAKE_INVALID: |
| 522 | ret = -EINVAL; |
| 523 | break; |
| 524 | |
| 525 | case OCFS2_CONTROL_HANDSHAKE_READ: |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 526 | ret = ocfs2_control_validate_protocol(file, buf, |
| 527 | count); |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 528 | break; |
| 529 | |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 530 | case OCFS2_CONTROL_HANDSHAKE_PROTOCOL: |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 531 | case OCFS2_CONTROL_HANDSHAKE_VALID: |
Joel Becker | de870ef | 2008-02-18 17:07:09 -0800 | [diff] [blame] | 532 | ret = ocfs2_control_message(file, buf, count); |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 533 | break; |
| 534 | |
| 535 | default: |
| 536 | BUG(); |
| 537 | ret = -EIO; |
| 538 | break; |
| 539 | } |
| 540 | |
| 541 | return ret; |
Joel Becker | 8adf053 | 2007-11-28 14:38:40 -0800 | [diff] [blame] | 542 | } |
| 543 | |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 544 | /* |
| 545 | * This is a naive version. If we ever have a new protocol, we'll expand |
| 546 | * it. Probably using seq_file. |
| 547 | */ |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 548 | static ssize_t ocfs2_control_read(struct file *file, |
| 549 | char __user *buf, |
| 550 | size_t count, |
| 551 | loff_t *ppos) |
| 552 | { |
Akinobu Mita | 7600c72 | 2008-06-09 16:34:23 -0700 | [diff] [blame] | 553 | ssize_t ret; |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 554 | |
Akinobu Mita | 7600c72 | 2008-06-09 16:34:23 -0700 | [diff] [blame] | 555 | ret = simple_read_from_buffer(buf, count, ppos, |
| 556 | OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN); |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 557 | |
| 558 | /* Have we read the whole protocol list? */ |
Akinobu Mita | 7600c72 | 2008-06-09 16:34:23 -0700 | [diff] [blame] | 559 | if (ret > 0 && *ppos >= OCFS2_CONTROL_PROTO_LEN) |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 560 | ocfs2_control_set_handshake_state(file, |
| 561 | OCFS2_CONTROL_HANDSHAKE_READ); |
| 562 | |
Akinobu Mita | 7600c72 | 2008-06-09 16:34:23 -0700 | [diff] [blame] | 563 | return ret; |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | static int ocfs2_control_release(struct inode *inode, struct file *file) |
| 567 | { |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 568 | struct ocfs2_control_private *p = file->private_data; |
| 569 | |
| 570 | mutex_lock(&ocfs2_control_lock); |
| 571 | |
| 572 | if (ocfs2_control_get_handshake_state(file) != |
| 573 | OCFS2_CONTROL_HANDSHAKE_VALID) |
| 574 | goto out; |
| 575 | |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 576 | if (atomic_dec_and_test(&ocfs2_control_opened)) { |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 577 | if (!list_empty(&ocfs2_live_connection_list)) { |
| 578 | /* XXX: Do bad things! */ |
| 579 | printk(KERN_ERR |
| 580 | "ocfs2: Unexpected release of ocfs2_control!\n" |
| 581 | " Loss of cluster connection requires " |
| 582 | "an emergency restart!\n"); |
| 583 | emergency_restart(); |
| 584 | } |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 585 | /* |
| 586 | * Last valid close clears the node number and resets |
| 587 | * the locking protocol version |
| 588 | */ |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 589 | ocfs2_control_this_node = -1; |
Joel Becker | d4b95ee | 2008-02-20 15:39:44 -0800 | [diff] [blame] | 590 | running_proto.pv_major = 0; |
| 591 | running_proto.pv_major = 0; |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 592 | } |
| 593 | |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 594 | out: |
| 595 | list_del_init(&p->op_list); |
| 596 | file->private_data = NULL; |
| 597 | |
| 598 | mutex_unlock(&ocfs2_control_lock); |
| 599 | |
| 600 | kfree(p); |
| 601 | |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 602 | return 0; |
| 603 | } |
| 604 | |
| 605 | static int ocfs2_control_open(struct inode *inode, struct file *file) |
| 606 | { |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 607 | struct ocfs2_control_private *p; |
| 608 | |
| 609 | p = kzalloc(sizeof(struct ocfs2_control_private), GFP_KERNEL); |
| 610 | if (!p) |
| 611 | return -ENOMEM; |
Joel Becker | 3cfd4ab | 2008-02-20 14:44:34 -0800 | [diff] [blame] | 612 | p->op_this_node = -1; |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 613 | |
Arnd Bergmann | b7fdf9f | 2008-05-20 19:16:28 +0200 | [diff] [blame] | 614 | lock_kernel(); |
Joel Becker | 462c7e6 | 2008-02-18 19:40:12 -0800 | [diff] [blame] | 615 | mutex_lock(&ocfs2_control_lock); |
| 616 | file->private_data = p; |
| 617 | list_add(&p->op_list, &ocfs2_control_private_list); |
| 618 | mutex_unlock(&ocfs2_control_lock); |
Arnd Bergmann | b7fdf9f | 2008-05-20 19:16:28 +0200 | [diff] [blame] | 619 | unlock_kernel(); |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 620 | |
| 621 | return 0; |
| 622 | } |
| 623 | |
| 624 | static const struct file_operations ocfs2_control_fops = { |
| 625 | .open = ocfs2_control_open, |
| 626 | .release = ocfs2_control_release, |
| 627 | .read = ocfs2_control_read, |
| 628 | .write = ocfs2_control_write, |
| 629 | .owner = THIS_MODULE, |
| 630 | }; |
| 631 | |
Adrian Bunk | 4d8755b | 2008-04-21 11:49:26 +0300 | [diff] [blame] | 632 | static struct miscdevice ocfs2_control_device = { |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 633 | .minor = MISC_DYNAMIC_MINOR, |
| 634 | .name = "ocfs2_control", |
| 635 | .fops = &ocfs2_control_fops, |
| 636 | }; |
| 637 | |
| 638 | static int ocfs2_control_init(void) |
| 639 | { |
| 640 | int rc; |
| 641 | |
| 642 | atomic_set(&ocfs2_control_opened, 0); |
| 643 | |
| 644 | rc = misc_register(&ocfs2_control_device); |
| 645 | if (rc) |
| 646 | printk(KERN_ERR |
| 647 | "ocfs2: Unable to register ocfs2_control device " |
| 648 | "(errno %d)\n", |
| 649 | -rc); |
| 650 | |
| 651 | return rc; |
| 652 | } |
| 653 | |
| 654 | static void ocfs2_control_exit(void) |
| 655 | { |
| 656 | int rc; |
| 657 | |
| 658 | rc = misc_deregister(&ocfs2_control_device); |
| 659 | if (rc) |
| 660 | printk(KERN_ERR |
| 661 | "ocfs2: Unable to deregister ocfs2_control device " |
| 662 | "(errno %d)\n", |
| 663 | -rc); |
| 664 | } |
| 665 | |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 666 | static void fsdlm_lock_ast_wrapper(void *astarg) |
| 667 | { |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame^] | 668 | struct ocfs2_dlm_lksb *lksb = astarg; |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 669 | int status = lksb->lksb_fsdlm.sb_status; |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 670 | |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 671 | BUG_ON(ocfs2_user_plugin.sp_proto == NULL); |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 672 | |
| 673 | /* |
| 674 | * For now we're punting on the issue of other non-standard errors |
| 675 | * where we can't tell if the unlock_ast or lock_ast should be called. |
| 676 | * The main "other error" that's possible is EINVAL which means the |
| 677 | * function was called with invalid args, which shouldn't be possible |
| 678 | * since the caller here is under our control. Other non-standard |
| 679 | * errors probably fall into the same category, or otherwise are fatal |
| 680 | * which means we can't carry on anyway. |
| 681 | */ |
| 682 | |
| 683 | if (status == -DLM_EUNLOCK || status == -DLM_ECANCEL) |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 684 | ocfs2_user_plugin.sp_proto->lp_unlock_ast(lksb, 0); |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 685 | else |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 686 | ocfs2_user_plugin.sp_proto->lp_lock_ast(lksb); |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 687 | } |
| 688 | |
| 689 | static void fsdlm_blocking_ast_wrapper(void *astarg, int level) |
| 690 | { |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame^] | 691 | struct ocfs2_dlm_lksb *lksb = astarg; |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 692 | |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 693 | BUG_ON(ocfs2_user_plugin.sp_proto == NULL); |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 694 | |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 695 | ocfs2_user_plugin.sp_proto->lp_blocking_ast(lksb, level); |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 696 | } |
| 697 | |
| 698 | static int user_dlm_lock(struct ocfs2_cluster_connection *conn, |
| 699 | int mode, |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame^] | 700 | struct ocfs2_dlm_lksb *lksb, |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 701 | u32 flags, |
| 702 | void *name, |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 703 | unsigned int namelen) |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 704 | { |
| 705 | int ret; |
| 706 | |
| 707 | if (!lksb->lksb_fsdlm.sb_lvbptr) |
| 708 | lksb->lksb_fsdlm.sb_lvbptr = (char *)lksb + |
| 709 | sizeof(struct dlm_lksb); |
| 710 | |
| 711 | ret = dlm_lock(conn->cc_lockspace, mode, &lksb->lksb_fsdlm, |
| 712 | flags|DLM_LKF_NODLCKWT, name, namelen, 0, |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 713 | fsdlm_lock_ast_wrapper, lksb, |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 714 | fsdlm_blocking_ast_wrapper); |
| 715 | return ret; |
| 716 | } |
| 717 | |
| 718 | static int user_dlm_unlock(struct ocfs2_cluster_connection *conn, |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame^] | 719 | struct ocfs2_dlm_lksb *lksb, |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 720 | u32 flags) |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 721 | { |
| 722 | int ret; |
| 723 | |
| 724 | ret = dlm_unlock(conn->cc_lockspace, lksb->lksb_fsdlm.sb_lkid, |
Joel Becker | a796d28 | 2010-01-28 19:22:39 -0800 | [diff] [blame] | 725 | flags, &lksb->lksb_fsdlm, lksb); |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 726 | return ret; |
| 727 | } |
| 728 | |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame^] | 729 | static int user_dlm_lock_status(struct ocfs2_dlm_lksb *lksb) |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 730 | { |
| 731 | return lksb->lksb_fsdlm.sb_status; |
| 732 | } |
| 733 | |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame^] | 734 | static int user_dlm_lvb_valid(struct ocfs2_dlm_lksb *lksb) |
Joel Becker | 1c520df | 2009-06-19 15:14:13 -0700 | [diff] [blame] | 735 | { |
| 736 | int invalid = lksb->lksb_fsdlm.sb_flags & DLM_SBF_VALNOTVALID; |
| 737 | |
| 738 | return !invalid; |
| 739 | } |
| 740 | |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame^] | 741 | static void *user_dlm_lvb(struct ocfs2_dlm_lksb *lksb) |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 742 | { |
David Teigland | 66f502a | 2008-11-10 16:24:57 -0600 | [diff] [blame] | 743 | if (!lksb->lksb_fsdlm.sb_lvbptr) |
| 744 | lksb->lksb_fsdlm.sb_lvbptr = (char *)lksb + |
| 745 | sizeof(struct dlm_lksb); |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 746 | return (void *)(lksb->lksb_fsdlm.sb_lvbptr); |
| 747 | } |
| 748 | |
Joel Becker | c0e4133 | 2010-01-29 14:46:44 -0800 | [diff] [blame^] | 749 | static void user_dlm_dump_lksb(struct ocfs2_dlm_lksb *lksb) |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 750 | { |
| 751 | } |
| 752 | |
Mark Fasheh | 53da493 | 2008-07-21 14:29:16 -0700 | [diff] [blame] | 753 | static int user_plock(struct ocfs2_cluster_connection *conn, |
| 754 | u64 ino, |
| 755 | struct file *file, |
| 756 | int cmd, |
| 757 | struct file_lock *fl) |
| 758 | { |
| 759 | /* |
| 760 | * This more or less just demuxes the plock request into any |
| 761 | * one of three dlm calls. |
| 762 | * |
| 763 | * Internally, fs/dlm will pass these to a misc device, which |
| 764 | * a userspace daemon will read and write to. |
| 765 | * |
| 766 | * For now, cancel requests (which happen internally only), |
| 767 | * are turned into unlocks. Most of this function taken from |
| 768 | * gfs2_lock. |
| 769 | */ |
| 770 | |
| 771 | if (cmd == F_CANCELLK) { |
| 772 | cmd = F_SETLK; |
| 773 | fl->fl_type = F_UNLCK; |
| 774 | } |
| 775 | |
| 776 | if (IS_GETLK(cmd)) |
| 777 | return dlm_posix_get(conn->cc_lockspace, ino, file, fl); |
| 778 | else if (fl->fl_type == F_UNLCK) |
| 779 | return dlm_posix_unlock(conn->cc_lockspace, ino, file, fl); |
| 780 | else |
| 781 | return dlm_posix_lock(conn->cc_lockspace, ino, file, cmd, fl); |
| 782 | } |
| 783 | |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 784 | /* |
| 785 | * Compare a requested locking protocol version against the current one. |
| 786 | * |
| 787 | * If the major numbers are different, they are incompatible. |
| 788 | * If the current minor is greater than the request, they are incompatible. |
| 789 | * If the current minor is less than or equal to the request, they are |
| 790 | * compatible, and the requester should run at the current minor version. |
| 791 | */ |
| 792 | static int fs_protocol_compare(struct ocfs2_protocol_version *existing, |
| 793 | struct ocfs2_protocol_version *request) |
| 794 | { |
| 795 | if (existing->pv_major != request->pv_major) |
| 796 | return 1; |
| 797 | |
| 798 | if (existing->pv_minor > request->pv_minor) |
| 799 | return 1; |
| 800 | |
| 801 | if (existing->pv_minor < request->pv_minor) |
| 802 | request->pv_minor = existing->pv_minor; |
| 803 | |
| 804 | return 0; |
| 805 | } |
| 806 | |
| 807 | static int user_cluster_connect(struct ocfs2_cluster_connection *conn) |
| 808 | { |
| 809 | dlm_lockspace_t *fsdlm; |
Coly Li | 3a05d79 | 2009-12-04 02:02:35 +0800 | [diff] [blame] | 810 | struct ocfs2_live_connection *uninitialized_var(control); |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 811 | int rc = 0; |
| 812 | |
| 813 | BUG_ON(conn == NULL); |
| 814 | |
| 815 | rc = ocfs2_live_connection_new(conn, &control); |
| 816 | if (rc) |
| 817 | goto out; |
| 818 | |
| 819 | /* |
| 820 | * running_proto must have been set before we allowed any mounts |
| 821 | * to proceed. |
| 822 | */ |
| 823 | if (fs_protocol_compare(&running_proto, &conn->cc_version)) { |
| 824 | printk(KERN_ERR |
| 825 | "Unable to mount with fs locking protocol version " |
| 826 | "%u.%u because the userspace control daemon has " |
| 827 | "negotiated %u.%u\n", |
| 828 | conn->cc_version.pv_major, conn->cc_version.pv_minor, |
| 829 | running_proto.pv_major, running_proto.pv_minor); |
| 830 | rc = -EPROTO; |
| 831 | ocfs2_live_connection_drop(control); |
| 832 | goto out; |
| 833 | } |
| 834 | |
| 835 | rc = dlm_new_lockspace(conn->cc_name, strlen(conn->cc_name), |
| 836 | &fsdlm, DLM_LSFL_FS, DLM_LVB_LEN); |
| 837 | if (rc) { |
| 838 | ocfs2_live_connection_drop(control); |
| 839 | goto out; |
| 840 | } |
| 841 | |
| 842 | conn->cc_private = control; |
| 843 | conn->cc_lockspace = fsdlm; |
| 844 | out: |
| 845 | return rc; |
| 846 | } |
| 847 | |
Joel Becker | 2c39450 | 2008-05-30 15:58:26 -0700 | [diff] [blame] | 848 | static int user_cluster_disconnect(struct ocfs2_cluster_connection *conn) |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 849 | { |
| 850 | dlm_release_lockspace(conn->cc_lockspace, 2); |
| 851 | conn->cc_lockspace = NULL; |
| 852 | ocfs2_live_connection_drop(conn->cc_private); |
| 853 | conn->cc_private = NULL; |
| 854 | return 0; |
| 855 | } |
| 856 | |
| 857 | static int user_cluster_this_node(unsigned int *this_node) |
| 858 | { |
| 859 | int rc; |
| 860 | |
| 861 | rc = ocfs2_control_get_this_node(); |
| 862 | if (rc < 0) |
| 863 | return rc; |
| 864 | |
| 865 | *this_node = rc; |
| 866 | return 0; |
| 867 | } |
| 868 | |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 869 | static struct ocfs2_stack_operations ocfs2_user_plugin_ops = { |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 870 | .connect = user_cluster_connect, |
| 871 | .disconnect = user_cluster_disconnect, |
| 872 | .this_node = user_cluster_this_node, |
| 873 | .dlm_lock = user_dlm_lock, |
| 874 | .dlm_unlock = user_dlm_unlock, |
| 875 | .lock_status = user_dlm_lock_status, |
Joel Becker | 1c520df | 2009-06-19 15:14:13 -0700 | [diff] [blame] | 876 | .lvb_valid = user_dlm_lvb_valid, |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 877 | .lock_lvb = user_dlm_lvb, |
Mark Fasheh | 53da493 | 2008-07-21 14:29:16 -0700 | [diff] [blame] | 878 | .plock = user_plock, |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 879 | .dump_lksb = user_dlm_dump_lksb, |
| 880 | }; |
| 881 | |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 882 | static struct ocfs2_stack_plugin ocfs2_user_plugin = { |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 883 | .sp_name = "user", |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 884 | .sp_ops = &ocfs2_user_plugin_ops, |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 885 | .sp_owner = THIS_MODULE, |
| 886 | }; |
| 887 | |
| 888 | |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 889 | static int __init ocfs2_user_plugin_init(void) |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 890 | { |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 891 | int rc; |
| 892 | |
| 893 | rc = ocfs2_control_init(); |
| 894 | if (!rc) { |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 895 | rc = ocfs2_stack_glue_register(&ocfs2_user_plugin); |
David Teigland | cf4d8d7 | 2008-02-20 14:29:27 -0800 | [diff] [blame] | 896 | if (rc) |
| 897 | ocfs2_control_exit(); |
| 898 | } |
| 899 | |
| 900 | return rc; |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 901 | } |
| 902 | |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 903 | static void __exit ocfs2_user_plugin_exit(void) |
Joel Becker | 8adf053 | 2007-11-28 14:38:40 -0800 | [diff] [blame] | 904 | { |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 905 | ocfs2_stack_glue_unregister(&ocfs2_user_plugin); |
Joel Becker | 6427a72 | 2008-02-18 19:23:28 -0800 | [diff] [blame] | 906 | ocfs2_control_exit(); |
Joel Becker | 8adf053 | 2007-11-28 14:38:40 -0800 | [diff] [blame] | 907 | } |
| 908 | |
| 909 | MODULE_AUTHOR("Oracle"); |
| 910 | MODULE_DESCRIPTION("ocfs2 driver for userspace cluster stacks"); |
| 911 | MODULE_LICENSE("GPL"); |
Joel Becker | a12630b | 2008-05-09 18:49:29 -0700 | [diff] [blame] | 912 | module_init(ocfs2_user_plugin_init); |
| 913 | module_exit(ocfs2_user_plugin_exit); |