Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1 | /* |
| 2 | * GPL HEADER START |
| 3 | * |
| 4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 only, |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but |
| 11 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | * General Public License version 2 for more details (a copy is included |
| 14 | * in the LICENSE file that accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * version 2 along with this program; If not, see |
| 18 | * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| 19 | * |
| 20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 21 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 22 | * have any questions. |
| 23 | * |
| 24 | * GPL HEADER END |
| 25 | */ |
| 26 | /* |
| 27 | * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
| 28 | * Use is subject to license terms. |
| 29 | * |
| 30 | * Copyright (c) 2011, 2012, Intel Corporation. |
| 31 | */ |
| 32 | /* |
| 33 | * This file is part of Lustre, http://www.lustre.org/ |
| 34 | * Lustre is a trademark of Sun Microsystems, Inc. |
| 35 | * |
| 36 | * lustre/obdclass/genops.c |
| 37 | * |
| 38 | * These are the only exported functions, they provide some generic |
| 39 | * infrastructure for managing object devices |
| 40 | */ |
| 41 | |
| 42 | #define DEBUG_SUBSYSTEM S_CLASS |
| 43 | #include <obd_ost.h> |
| 44 | #include <obd_class.h> |
| 45 | #include <lprocfs_status.h> |
| 46 | |
| 47 | extern struct list_head obd_types; |
| 48 | spinlock_t obd_types_lock; |
| 49 | |
| 50 | struct kmem_cache *obd_device_cachep; |
| 51 | struct kmem_cache *obdo_cachep; |
| 52 | EXPORT_SYMBOL(obdo_cachep); |
| 53 | struct kmem_cache *import_cachep; |
| 54 | |
| 55 | struct list_head obd_zombie_imports; |
| 56 | struct list_head obd_zombie_exports; |
| 57 | spinlock_t obd_zombie_impexp_lock; |
| 58 | static void obd_zombie_impexp_notify(void); |
| 59 | static void obd_zombie_export_add(struct obd_export *exp); |
| 60 | static void obd_zombie_import_add(struct obd_import *imp); |
| 61 | static void print_export_data(struct obd_export *exp, |
| 62 | const char *status, int locks); |
| 63 | |
| 64 | int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c); |
| 65 | EXPORT_SYMBOL(ptlrpc_put_connection_superhack); |
| 66 | |
| 67 | /* |
| 68 | * support functions: we could use inter-module communication, but this |
| 69 | * is more portable to other OS's |
| 70 | */ |
| 71 | static struct obd_device *obd_device_alloc(void) |
| 72 | { |
| 73 | struct obd_device *obd; |
| 74 | |
| 75 | OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, __GFP_IO); |
| 76 | if (obd != NULL) { |
| 77 | obd->obd_magic = OBD_DEVICE_MAGIC; |
| 78 | } |
| 79 | return obd; |
| 80 | } |
| 81 | |
| 82 | static void obd_device_free(struct obd_device *obd) |
| 83 | { |
| 84 | LASSERT(obd != NULL); |
| 85 | LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n", |
| 86 | obd, obd->obd_magic, OBD_DEVICE_MAGIC); |
| 87 | if (obd->obd_namespace != NULL) { |
| 88 | CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n", |
| 89 | obd, obd->obd_namespace, obd->obd_force); |
| 90 | LBUG(); |
| 91 | } |
| 92 | lu_ref_fini(&obd->obd_reference); |
| 93 | OBD_SLAB_FREE_PTR(obd, obd_device_cachep); |
| 94 | } |
| 95 | |
| 96 | struct obd_type *class_search_type(const char *name) |
| 97 | { |
| 98 | struct list_head *tmp; |
| 99 | struct obd_type *type; |
| 100 | |
| 101 | spin_lock(&obd_types_lock); |
| 102 | list_for_each(tmp, &obd_types) { |
| 103 | type = list_entry(tmp, struct obd_type, typ_chain); |
| 104 | if (strcmp(type->typ_name, name) == 0) { |
| 105 | spin_unlock(&obd_types_lock); |
| 106 | return type; |
| 107 | } |
| 108 | } |
| 109 | spin_unlock(&obd_types_lock); |
| 110 | return NULL; |
| 111 | } |
| 112 | EXPORT_SYMBOL(class_search_type); |
| 113 | |
| 114 | struct obd_type *class_get_type(const char *name) |
| 115 | { |
| 116 | struct obd_type *type = class_search_type(name); |
| 117 | |
| 118 | if (!type) { |
| 119 | const char *modname = name; |
| 120 | |
| 121 | if (strcmp(modname, "obdfilter") == 0) |
| 122 | modname = "ofd"; |
| 123 | |
| 124 | if (strcmp(modname, LUSTRE_LWP_NAME) == 0) |
| 125 | modname = LUSTRE_OSP_NAME; |
| 126 | |
| 127 | if (!strncmp(modname, LUSTRE_MDS_NAME, strlen(LUSTRE_MDS_NAME))) |
| 128 | modname = LUSTRE_MDT_NAME; |
| 129 | |
| 130 | if (!request_module("%s", modname)) { |
| 131 | CDEBUG(D_INFO, "Loaded module '%s'\n", modname); |
| 132 | type = class_search_type(name); |
| 133 | } else { |
| 134 | LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n", |
| 135 | modname); |
| 136 | } |
| 137 | } |
| 138 | if (type) { |
| 139 | spin_lock(&type->obd_type_lock); |
| 140 | type->typ_refcnt++; |
| 141 | try_module_get(type->typ_dt_ops->o_owner); |
| 142 | spin_unlock(&type->obd_type_lock); |
| 143 | } |
| 144 | return type; |
| 145 | } |
| 146 | EXPORT_SYMBOL(class_get_type); |
| 147 | |
| 148 | void class_put_type(struct obd_type *type) |
| 149 | { |
| 150 | LASSERT(type); |
| 151 | spin_lock(&type->obd_type_lock); |
| 152 | type->typ_refcnt--; |
| 153 | module_put(type->typ_dt_ops->o_owner); |
| 154 | spin_unlock(&type->obd_type_lock); |
| 155 | } |
| 156 | EXPORT_SYMBOL(class_put_type); |
| 157 | |
| 158 | #define CLASS_MAX_NAME 1024 |
| 159 | |
| 160 | int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, |
| 161 | struct lprocfs_vars *vars, const char *name, |
| 162 | struct lu_device_type *ldt) |
| 163 | { |
| 164 | struct obd_type *type; |
| 165 | int rc = 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 166 | |
| 167 | /* sanity check */ |
| 168 | LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME); |
| 169 | |
| 170 | if (class_search_type(name)) { |
| 171 | CDEBUG(D_IOCTL, "Type %s already registered\n", name); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 172 | return -EEXIST; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 173 | } |
| 174 | |
| 175 | rc = -ENOMEM; |
| 176 | OBD_ALLOC(type, sizeof(*type)); |
| 177 | if (type == NULL) |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 178 | return rc; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 179 | |
| 180 | OBD_ALLOC_PTR(type->typ_dt_ops); |
| 181 | OBD_ALLOC_PTR(type->typ_md_ops); |
| 182 | OBD_ALLOC(type->typ_name, strlen(name) + 1); |
| 183 | |
| 184 | if (type->typ_dt_ops == NULL || |
| 185 | type->typ_md_ops == NULL || |
| 186 | type->typ_name == NULL) |
| 187 | GOTO (failed, rc); |
| 188 | |
| 189 | *(type->typ_dt_ops) = *dt_ops; |
| 190 | /* md_ops is optional */ |
| 191 | if (md_ops) |
| 192 | *(type->typ_md_ops) = *md_ops; |
| 193 | strcpy(type->typ_name, name); |
| 194 | spin_lock_init(&type->obd_type_lock); |
| 195 | |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 196 | type->typ_procroot = lprocfs_register(type->typ_name, proc_lustre_root, |
| 197 | vars, type); |
| 198 | if (IS_ERR(type->typ_procroot)) { |
| 199 | rc = PTR_ERR(type->typ_procroot); |
| 200 | type->typ_procroot = NULL; |
| 201 | GOTO (failed, rc); |
| 202 | } |
Peng Tao | 8cc420d | 2013-12-03 22:41:59 +0800 | [diff] [blame] | 203 | |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 204 | if (ldt != NULL) { |
| 205 | type->typ_lu = ldt; |
| 206 | rc = lu_device_type_init(ldt); |
| 207 | if (rc != 0) |
| 208 | GOTO (failed, rc); |
| 209 | } |
| 210 | |
| 211 | spin_lock(&obd_types_lock); |
| 212 | list_add(&type->typ_chain, &obd_types); |
| 213 | spin_unlock(&obd_types_lock); |
| 214 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 215 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 216 | |
| 217 | failed: |
| 218 | if (type->typ_name != NULL) |
| 219 | OBD_FREE(type->typ_name, strlen(name) + 1); |
| 220 | if (type->typ_md_ops != NULL) |
| 221 | OBD_FREE_PTR(type->typ_md_ops); |
| 222 | if (type->typ_dt_ops != NULL) |
| 223 | OBD_FREE_PTR(type->typ_dt_ops); |
| 224 | OBD_FREE(type, sizeof(*type)); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 225 | return rc; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 226 | } |
| 227 | EXPORT_SYMBOL(class_register_type); |
| 228 | |
| 229 | int class_unregister_type(const char *name) |
| 230 | { |
| 231 | struct obd_type *type = class_search_type(name); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 232 | |
| 233 | if (!type) { |
| 234 | CERROR("unknown obd type\n"); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 235 | return -EINVAL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | if (type->typ_refcnt) { |
| 239 | CERROR("type %s has refcount (%d)\n", name, type->typ_refcnt); |
| 240 | /* This is a bad situation, let's make the best of it */ |
| 241 | /* Remove ops, but leave the name for debugging */ |
| 242 | OBD_FREE_PTR(type->typ_dt_ops); |
| 243 | OBD_FREE_PTR(type->typ_md_ops); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 244 | return -EBUSY; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 245 | } |
| 246 | |
Peng Tao | 73bb1da | 2013-05-29 21:40:55 +0800 | [diff] [blame] | 247 | if (type->typ_procroot) { |
| 248 | lprocfs_remove(&type->typ_procroot); |
| 249 | } |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 250 | |
| 251 | if (type->typ_lu) |
| 252 | lu_device_type_fini(type->typ_lu); |
| 253 | |
| 254 | spin_lock(&obd_types_lock); |
| 255 | list_del(&type->typ_chain); |
| 256 | spin_unlock(&obd_types_lock); |
| 257 | OBD_FREE(type->typ_name, strlen(name) + 1); |
| 258 | if (type->typ_dt_ops != NULL) |
| 259 | OBD_FREE_PTR(type->typ_dt_ops); |
| 260 | if (type->typ_md_ops != NULL) |
| 261 | OBD_FREE_PTR(type->typ_md_ops); |
| 262 | OBD_FREE(type, sizeof(*type)); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 263 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 264 | } /* class_unregister_type */ |
| 265 | EXPORT_SYMBOL(class_unregister_type); |
| 266 | |
| 267 | /** |
| 268 | * Create a new obd device. |
| 269 | * |
| 270 | * Find an empty slot in ::obd_devs[], create a new obd device in it. |
| 271 | * |
| 272 | * \param[in] type_name obd device type string. |
| 273 | * \param[in] name obd device name. |
| 274 | * |
| 275 | * \retval NULL if create fails, otherwise return the obd device |
| 276 | * pointer created. |
| 277 | */ |
| 278 | struct obd_device *class_newdev(const char *type_name, const char *name) |
| 279 | { |
| 280 | struct obd_device *result = NULL; |
| 281 | struct obd_device *newdev; |
| 282 | struct obd_type *type = NULL; |
| 283 | int i; |
| 284 | int new_obd_minor = 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 285 | |
| 286 | if (strlen(name) >= MAX_OBD_NAME) { |
| 287 | CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 288 | return ERR_PTR(-EINVAL); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | type = class_get_type(type_name); |
| 292 | if (type == NULL){ |
| 293 | CERROR("OBD: unknown type: %s\n", type_name); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 294 | return ERR_PTR(-ENODEV); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | newdev = obd_device_alloc(); |
| 298 | if (newdev == NULL) |
| 299 | GOTO(out_type, result = ERR_PTR(-ENOMEM)); |
| 300 | |
| 301 | LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC); |
| 302 | |
| 303 | write_lock(&obd_dev_lock); |
| 304 | for (i = 0; i < class_devno_max(); i++) { |
| 305 | struct obd_device *obd = class_num2obd(i); |
| 306 | |
| 307 | if (obd && (strcmp(name, obd->obd_name) == 0)) { |
| 308 | CERROR("Device %s already exists at %d, won't add\n", |
| 309 | name, i); |
| 310 | if (result) { |
| 311 | LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC, |
| 312 | "%p obd_magic %08x != %08x\n", result, |
| 313 | result->obd_magic, OBD_DEVICE_MAGIC); |
| 314 | LASSERTF(result->obd_minor == new_obd_minor, |
| 315 | "%p obd_minor %d != %d\n", result, |
| 316 | result->obd_minor, new_obd_minor); |
| 317 | |
| 318 | obd_devs[result->obd_minor] = NULL; |
| 319 | result->obd_name[0]='\0'; |
| 320 | } |
| 321 | result = ERR_PTR(-EEXIST); |
| 322 | break; |
| 323 | } |
| 324 | if (!result && !obd) { |
| 325 | result = newdev; |
| 326 | result->obd_minor = i; |
| 327 | new_obd_minor = i; |
| 328 | result->obd_type = type; |
| 329 | strncpy(result->obd_name, name, |
| 330 | sizeof(result->obd_name) - 1); |
| 331 | obd_devs[i] = result; |
| 332 | } |
| 333 | } |
| 334 | write_unlock(&obd_dev_lock); |
| 335 | |
| 336 | if (result == NULL && i >= class_devno_max()) { |
| 337 | CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n", |
| 338 | class_devno_max()); |
| 339 | GOTO(out, result = ERR_PTR(-EOVERFLOW)); |
| 340 | } |
| 341 | |
| 342 | if (IS_ERR(result)) |
| 343 | GOTO(out, result); |
| 344 | |
| 345 | CDEBUG(D_IOCTL, "Adding new device %s (%p)\n", |
| 346 | result->obd_name, result); |
| 347 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 348 | return result; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 349 | out: |
| 350 | obd_device_free(newdev); |
| 351 | out_type: |
| 352 | class_put_type(type); |
| 353 | return result; |
| 354 | } |
| 355 | |
| 356 | void class_release_dev(struct obd_device *obd) |
| 357 | { |
| 358 | struct obd_type *obd_type = obd->obd_type; |
| 359 | |
| 360 | LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n", |
| 361 | obd, obd->obd_magic, OBD_DEVICE_MAGIC); |
| 362 | LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n", |
| 363 | obd, obd->obd_minor, obd_devs[obd->obd_minor]); |
| 364 | LASSERT(obd_type != NULL); |
| 365 | |
| 366 | CDEBUG(D_INFO, "Release obd device %s at %d obd_type name =%s\n", |
| 367 | obd->obd_name, obd->obd_minor, obd->obd_type->typ_name); |
| 368 | |
| 369 | write_lock(&obd_dev_lock); |
| 370 | obd_devs[obd->obd_minor] = NULL; |
| 371 | write_unlock(&obd_dev_lock); |
| 372 | obd_device_free(obd); |
| 373 | |
| 374 | class_put_type(obd_type); |
| 375 | } |
| 376 | |
| 377 | int class_name2dev(const char *name) |
| 378 | { |
| 379 | int i; |
| 380 | |
| 381 | if (!name) |
| 382 | return -1; |
| 383 | |
| 384 | read_lock(&obd_dev_lock); |
| 385 | for (i = 0; i < class_devno_max(); i++) { |
| 386 | struct obd_device *obd = class_num2obd(i); |
| 387 | |
| 388 | if (obd && strcmp(name, obd->obd_name) == 0) { |
| 389 | /* Make sure we finished attaching before we give |
| 390 | out any references */ |
| 391 | LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC); |
| 392 | if (obd->obd_attached) { |
| 393 | read_unlock(&obd_dev_lock); |
| 394 | return i; |
| 395 | } |
| 396 | break; |
| 397 | } |
| 398 | } |
| 399 | read_unlock(&obd_dev_lock); |
| 400 | |
| 401 | return -1; |
| 402 | } |
| 403 | EXPORT_SYMBOL(class_name2dev); |
| 404 | |
| 405 | struct obd_device *class_name2obd(const char *name) |
| 406 | { |
| 407 | int dev = class_name2dev(name); |
| 408 | |
| 409 | if (dev < 0 || dev > class_devno_max()) |
| 410 | return NULL; |
| 411 | return class_num2obd(dev); |
| 412 | } |
| 413 | EXPORT_SYMBOL(class_name2obd); |
| 414 | |
| 415 | int class_uuid2dev(struct obd_uuid *uuid) |
| 416 | { |
| 417 | int i; |
| 418 | |
| 419 | read_lock(&obd_dev_lock); |
| 420 | for (i = 0; i < class_devno_max(); i++) { |
| 421 | struct obd_device *obd = class_num2obd(i); |
| 422 | |
| 423 | if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) { |
| 424 | LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC); |
| 425 | read_unlock(&obd_dev_lock); |
| 426 | return i; |
| 427 | } |
| 428 | } |
| 429 | read_unlock(&obd_dev_lock); |
| 430 | |
| 431 | return -1; |
| 432 | } |
| 433 | EXPORT_SYMBOL(class_uuid2dev); |
| 434 | |
| 435 | struct obd_device *class_uuid2obd(struct obd_uuid *uuid) |
| 436 | { |
| 437 | int dev = class_uuid2dev(uuid); |
| 438 | if (dev < 0) |
| 439 | return NULL; |
| 440 | return class_num2obd(dev); |
| 441 | } |
| 442 | EXPORT_SYMBOL(class_uuid2obd); |
| 443 | |
| 444 | /** |
| 445 | * Get obd device from ::obd_devs[] |
| 446 | * |
| 447 | * \param num [in] array index |
| 448 | * |
| 449 | * \retval NULL if ::obd_devs[\a num] does not contains an obd device |
| 450 | * otherwise return the obd device there. |
| 451 | */ |
| 452 | struct obd_device *class_num2obd(int num) |
| 453 | { |
| 454 | struct obd_device *obd = NULL; |
| 455 | |
| 456 | if (num < class_devno_max()) { |
| 457 | obd = obd_devs[num]; |
| 458 | if (obd == NULL) |
| 459 | return NULL; |
| 460 | |
| 461 | LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, |
| 462 | "%p obd_magic %08x != %08x\n", |
| 463 | obd, obd->obd_magic, OBD_DEVICE_MAGIC); |
| 464 | LASSERTF(obd->obd_minor == num, |
| 465 | "%p obd_minor %0d != %0d\n", |
| 466 | obd, obd->obd_minor, num); |
| 467 | } |
| 468 | |
| 469 | return obd; |
| 470 | } |
| 471 | EXPORT_SYMBOL(class_num2obd); |
| 472 | |
| 473 | /** |
| 474 | * Get obd devices count. Device in any |
| 475 | * state are counted |
| 476 | * \retval obd device count |
| 477 | */ |
| 478 | int get_devices_count(void) |
| 479 | { |
| 480 | int index, max_index = class_devno_max(), dev_count = 0; |
| 481 | |
| 482 | read_lock(&obd_dev_lock); |
| 483 | for (index = 0; index <= max_index; index++) { |
| 484 | struct obd_device *obd = class_num2obd(index); |
| 485 | if (obd != NULL) |
| 486 | dev_count++; |
| 487 | } |
| 488 | read_unlock(&obd_dev_lock); |
| 489 | |
| 490 | return dev_count; |
| 491 | } |
| 492 | EXPORT_SYMBOL(get_devices_count); |
| 493 | |
| 494 | void class_obd_list(void) |
| 495 | { |
| 496 | char *status; |
| 497 | int i; |
| 498 | |
| 499 | read_lock(&obd_dev_lock); |
| 500 | for (i = 0; i < class_devno_max(); i++) { |
| 501 | struct obd_device *obd = class_num2obd(i); |
| 502 | |
| 503 | if (obd == NULL) |
| 504 | continue; |
| 505 | if (obd->obd_stopping) |
| 506 | status = "ST"; |
| 507 | else if (obd->obd_set_up) |
| 508 | status = "UP"; |
| 509 | else if (obd->obd_attached) |
| 510 | status = "AT"; |
| 511 | else |
| 512 | status = "--"; |
| 513 | LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n", |
| 514 | i, status, obd->obd_type->typ_name, |
| 515 | obd->obd_name, obd->obd_uuid.uuid, |
| 516 | atomic_read(&obd->obd_refcount)); |
| 517 | } |
| 518 | read_unlock(&obd_dev_lock); |
| 519 | return; |
| 520 | } |
| 521 | |
| 522 | /* Search for a client OBD connected to tgt_uuid. If grp_uuid is |
| 523 | specified, then only the client with that uuid is returned, |
| 524 | otherwise any client connected to the tgt is returned. */ |
| 525 | struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid, |
| 526 | const char * typ_name, |
| 527 | struct obd_uuid *grp_uuid) |
| 528 | { |
| 529 | int i; |
| 530 | |
| 531 | read_lock(&obd_dev_lock); |
| 532 | for (i = 0; i < class_devno_max(); i++) { |
| 533 | struct obd_device *obd = class_num2obd(i); |
| 534 | |
| 535 | if (obd == NULL) |
| 536 | continue; |
| 537 | if ((strncmp(obd->obd_type->typ_name, typ_name, |
| 538 | strlen(typ_name)) == 0)) { |
| 539 | if (obd_uuid_equals(tgt_uuid, |
| 540 | &obd->u.cli.cl_target_uuid) && |
| 541 | ((grp_uuid)? obd_uuid_equals(grp_uuid, |
| 542 | &obd->obd_uuid) : 1)) { |
| 543 | read_unlock(&obd_dev_lock); |
| 544 | return obd; |
| 545 | } |
| 546 | } |
| 547 | } |
| 548 | read_unlock(&obd_dev_lock); |
| 549 | |
| 550 | return NULL; |
| 551 | } |
| 552 | EXPORT_SYMBOL(class_find_client_obd); |
| 553 | |
| 554 | /* Iterate the obd_device list looking devices have grp_uuid. Start |
| 555 | searching at *next, and if a device is found, the next index to look |
| 556 | at is saved in *next. If next is NULL, then the first matching device |
| 557 | will always be returned. */ |
| 558 | struct obd_device * class_devices_in_group(struct obd_uuid *grp_uuid, int *next) |
| 559 | { |
| 560 | int i; |
| 561 | |
| 562 | if (next == NULL) |
| 563 | i = 0; |
| 564 | else if (*next >= 0 && *next < class_devno_max()) |
| 565 | i = *next; |
| 566 | else |
| 567 | return NULL; |
| 568 | |
| 569 | read_lock(&obd_dev_lock); |
| 570 | for (; i < class_devno_max(); i++) { |
| 571 | struct obd_device *obd = class_num2obd(i); |
| 572 | |
| 573 | if (obd == NULL) |
| 574 | continue; |
| 575 | if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) { |
| 576 | if (next != NULL) |
| 577 | *next = i+1; |
| 578 | read_unlock(&obd_dev_lock); |
| 579 | return obd; |
| 580 | } |
| 581 | } |
| 582 | read_unlock(&obd_dev_lock); |
| 583 | |
| 584 | return NULL; |
| 585 | } |
| 586 | EXPORT_SYMBOL(class_devices_in_group); |
| 587 | |
| 588 | /** |
| 589 | * to notify sptlrpc log for \a fsname has changed, let every relevant OBD |
| 590 | * adjust sptlrpc settings accordingly. |
| 591 | */ |
| 592 | int class_notify_sptlrpc_conf(const char *fsname, int namelen) |
| 593 | { |
| 594 | struct obd_device *obd; |
| 595 | const char *type; |
| 596 | int i, rc = 0, rc2; |
| 597 | |
| 598 | LASSERT(namelen > 0); |
| 599 | |
| 600 | read_lock(&obd_dev_lock); |
| 601 | for (i = 0; i < class_devno_max(); i++) { |
| 602 | obd = class_num2obd(i); |
| 603 | |
| 604 | if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping) |
| 605 | continue; |
| 606 | |
| 607 | /* only notify mdc, osc, mdt, ost */ |
| 608 | type = obd->obd_type->typ_name; |
| 609 | if (strcmp(type, LUSTRE_MDC_NAME) != 0 && |
| 610 | strcmp(type, LUSTRE_OSC_NAME) != 0 && |
| 611 | strcmp(type, LUSTRE_MDT_NAME) != 0 && |
| 612 | strcmp(type, LUSTRE_OST_NAME) != 0) |
| 613 | continue; |
| 614 | |
| 615 | if (strncmp(obd->obd_name, fsname, namelen)) |
| 616 | continue; |
| 617 | |
| 618 | class_incref(obd, __FUNCTION__, obd); |
| 619 | read_unlock(&obd_dev_lock); |
| 620 | rc2 = obd_set_info_async(NULL, obd->obd_self_export, |
| 621 | sizeof(KEY_SPTLRPC_CONF), |
| 622 | KEY_SPTLRPC_CONF, 0, NULL, NULL); |
| 623 | rc = rc ? rc : rc2; |
| 624 | class_decref(obd, __FUNCTION__, obd); |
| 625 | read_lock(&obd_dev_lock); |
| 626 | } |
| 627 | read_unlock(&obd_dev_lock); |
| 628 | return rc; |
| 629 | } |
| 630 | EXPORT_SYMBOL(class_notify_sptlrpc_conf); |
| 631 | |
| 632 | void obd_cleanup_caches(void) |
| 633 | { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 634 | if (obd_device_cachep) { |
| 635 | kmem_cache_destroy(obd_device_cachep); |
| 636 | obd_device_cachep = NULL; |
| 637 | } |
| 638 | if (obdo_cachep) { |
| 639 | kmem_cache_destroy(obdo_cachep); |
| 640 | obdo_cachep = NULL; |
| 641 | } |
| 642 | if (import_cachep) { |
| 643 | kmem_cache_destroy(import_cachep); |
| 644 | import_cachep = NULL; |
| 645 | } |
| 646 | if (capa_cachep) { |
| 647 | kmem_cache_destroy(capa_cachep); |
| 648 | capa_cachep = NULL; |
| 649 | } |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 650 | } |
| 651 | |
| 652 | int obd_init_caches(void) |
| 653 | { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 654 | LASSERT(obd_device_cachep == NULL); |
| 655 | obd_device_cachep = kmem_cache_create("ll_obd_dev_cache", |
| 656 | sizeof(struct obd_device), |
| 657 | 0, 0, NULL); |
| 658 | if (!obd_device_cachep) |
| 659 | GOTO(out, -ENOMEM); |
| 660 | |
| 661 | LASSERT(obdo_cachep == NULL); |
| 662 | obdo_cachep = kmem_cache_create("ll_obdo_cache", sizeof(struct obdo), |
| 663 | 0, 0, NULL); |
| 664 | if (!obdo_cachep) |
| 665 | GOTO(out, -ENOMEM); |
| 666 | |
| 667 | LASSERT(import_cachep == NULL); |
| 668 | import_cachep = kmem_cache_create("ll_import_cache", |
| 669 | sizeof(struct obd_import), |
| 670 | 0, 0, NULL); |
| 671 | if (!import_cachep) |
| 672 | GOTO(out, -ENOMEM); |
| 673 | |
| 674 | LASSERT(capa_cachep == NULL); |
| 675 | capa_cachep = kmem_cache_create("capa_cache", |
| 676 | sizeof(struct obd_capa), 0, 0, NULL); |
| 677 | if (!capa_cachep) |
| 678 | GOTO(out, -ENOMEM); |
| 679 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 680 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 681 | out: |
| 682 | obd_cleanup_caches(); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 683 | return -ENOMEM; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 684 | |
| 685 | } |
| 686 | |
| 687 | /* map connection to client */ |
| 688 | struct obd_export *class_conn2export(struct lustre_handle *conn) |
| 689 | { |
| 690 | struct obd_export *export; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 691 | |
| 692 | if (!conn) { |
| 693 | CDEBUG(D_CACHE, "looking for null handle\n"); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 694 | return NULL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 695 | } |
| 696 | |
| 697 | if (conn->cookie == -1) { /* this means assign a new connection */ |
| 698 | CDEBUG(D_CACHE, "want a new connection\n"); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 699 | return NULL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 700 | } |
| 701 | |
| 702 | CDEBUG(D_INFO, "looking for export cookie "LPX64"\n", conn->cookie); |
| 703 | export = class_handle2object(conn->cookie); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 704 | return export; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 705 | } |
| 706 | EXPORT_SYMBOL(class_conn2export); |
| 707 | |
| 708 | struct obd_device *class_exp2obd(struct obd_export *exp) |
| 709 | { |
| 710 | if (exp) |
| 711 | return exp->exp_obd; |
| 712 | return NULL; |
| 713 | } |
| 714 | EXPORT_SYMBOL(class_exp2obd); |
| 715 | |
| 716 | struct obd_device *class_conn2obd(struct lustre_handle *conn) |
| 717 | { |
| 718 | struct obd_export *export; |
| 719 | export = class_conn2export(conn); |
| 720 | if (export) { |
| 721 | struct obd_device *obd = export->exp_obd; |
| 722 | class_export_put(export); |
| 723 | return obd; |
| 724 | } |
| 725 | return NULL; |
| 726 | } |
| 727 | EXPORT_SYMBOL(class_conn2obd); |
| 728 | |
| 729 | struct obd_import *class_exp2cliimp(struct obd_export *exp) |
| 730 | { |
| 731 | struct obd_device *obd = exp->exp_obd; |
| 732 | if (obd == NULL) |
| 733 | return NULL; |
| 734 | return obd->u.cli.cl_import; |
| 735 | } |
| 736 | EXPORT_SYMBOL(class_exp2cliimp); |
| 737 | |
| 738 | struct obd_import *class_conn2cliimp(struct lustre_handle *conn) |
| 739 | { |
| 740 | struct obd_device *obd = class_conn2obd(conn); |
| 741 | if (obd == NULL) |
| 742 | return NULL; |
| 743 | return obd->u.cli.cl_import; |
| 744 | } |
| 745 | EXPORT_SYMBOL(class_conn2cliimp); |
| 746 | |
| 747 | /* Export management functions */ |
| 748 | static void class_export_destroy(struct obd_export *exp) |
| 749 | { |
| 750 | struct obd_device *obd = exp->exp_obd; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 751 | |
| 752 | LASSERT_ATOMIC_ZERO(&exp->exp_refcount); |
| 753 | LASSERT(obd != NULL); |
| 754 | |
| 755 | CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp, |
| 756 | exp->exp_client_uuid.uuid, obd->obd_name); |
| 757 | |
| 758 | /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */ |
| 759 | if (exp->exp_connection) |
| 760 | ptlrpc_put_connection_superhack(exp->exp_connection); |
| 761 | |
| 762 | LASSERT(list_empty(&exp->exp_outstanding_replies)); |
| 763 | LASSERT(list_empty(&exp->exp_uncommitted_replies)); |
| 764 | LASSERT(list_empty(&exp->exp_req_replay_queue)); |
| 765 | LASSERT(list_empty(&exp->exp_hp_rpcs)); |
| 766 | obd_destroy_export(exp); |
| 767 | class_decref(obd, "export", exp); |
| 768 | |
| 769 | OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 770 | } |
| 771 | |
| 772 | static void export_handle_addref(void *export) |
| 773 | { |
| 774 | class_export_get(export); |
| 775 | } |
| 776 | |
| 777 | static struct portals_handle_ops export_handle_ops = { |
| 778 | .hop_addref = export_handle_addref, |
| 779 | .hop_free = NULL, |
| 780 | }; |
| 781 | |
| 782 | struct obd_export *class_export_get(struct obd_export *exp) |
| 783 | { |
| 784 | atomic_inc(&exp->exp_refcount); |
| 785 | CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp, |
| 786 | atomic_read(&exp->exp_refcount)); |
| 787 | return exp; |
| 788 | } |
| 789 | EXPORT_SYMBOL(class_export_get); |
| 790 | |
| 791 | void class_export_put(struct obd_export *exp) |
| 792 | { |
| 793 | LASSERT(exp != NULL); |
| 794 | LASSERT_ATOMIC_GT_LT(&exp->exp_refcount, 0, LI_POISON); |
| 795 | CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp, |
| 796 | atomic_read(&exp->exp_refcount) - 1); |
| 797 | |
| 798 | if (atomic_dec_and_test(&exp->exp_refcount)) { |
| 799 | LASSERT(!list_empty(&exp->exp_obd_chain)); |
| 800 | CDEBUG(D_IOCTL, "final put %p/%s\n", |
| 801 | exp, exp->exp_client_uuid.uuid); |
| 802 | |
| 803 | /* release nid stat refererence */ |
| 804 | lprocfs_exp_cleanup(exp); |
| 805 | |
| 806 | obd_zombie_export_add(exp); |
| 807 | } |
| 808 | } |
| 809 | EXPORT_SYMBOL(class_export_put); |
| 810 | |
| 811 | /* Creates a new export, adds it to the hash table, and returns a |
| 812 | * pointer to it. The refcount is 2: one for the hash reference, and |
| 813 | * one for the pointer returned by this function. */ |
| 814 | struct obd_export *class_new_export(struct obd_device *obd, |
| 815 | struct obd_uuid *cluuid) |
| 816 | { |
| 817 | struct obd_export *export; |
Lisa Nguyen | 6da6eab | 2013-10-21 18:16:26 -0700 | [diff] [blame] | 818 | struct cfs_hash *hash = NULL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 819 | int rc = 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 820 | |
| 821 | OBD_ALLOC_PTR(export); |
| 822 | if (!export) |
| 823 | return ERR_PTR(-ENOMEM); |
| 824 | |
| 825 | export->exp_conn_cnt = 0; |
| 826 | export->exp_lock_hash = NULL; |
| 827 | export->exp_flock_hash = NULL; |
| 828 | atomic_set(&export->exp_refcount, 2); |
| 829 | atomic_set(&export->exp_rpc_count, 0); |
| 830 | atomic_set(&export->exp_cb_count, 0); |
| 831 | atomic_set(&export->exp_locks_count, 0); |
| 832 | #if LUSTRE_TRACKS_LOCK_EXP_REFS |
| 833 | INIT_LIST_HEAD(&export->exp_locks_list); |
| 834 | spin_lock_init(&export->exp_locks_list_guard); |
| 835 | #endif |
| 836 | atomic_set(&export->exp_replay_count, 0); |
| 837 | export->exp_obd = obd; |
| 838 | INIT_LIST_HEAD(&export->exp_outstanding_replies); |
| 839 | spin_lock_init(&export->exp_uncommitted_replies_lock); |
| 840 | INIT_LIST_HEAD(&export->exp_uncommitted_replies); |
| 841 | INIT_LIST_HEAD(&export->exp_req_replay_queue); |
| 842 | INIT_LIST_HEAD(&export->exp_handle.h_link); |
| 843 | INIT_LIST_HEAD(&export->exp_hp_rpcs); |
| 844 | class_handle_hash(&export->exp_handle, &export_handle_ops); |
| 845 | export->exp_last_request_time = cfs_time_current_sec(); |
| 846 | spin_lock_init(&export->exp_lock); |
| 847 | spin_lock_init(&export->exp_rpc_lock); |
| 848 | INIT_HLIST_NODE(&export->exp_uuid_hash); |
| 849 | INIT_HLIST_NODE(&export->exp_nid_hash); |
| 850 | spin_lock_init(&export->exp_bl_list_lock); |
| 851 | INIT_LIST_HEAD(&export->exp_bl_list); |
| 852 | |
| 853 | export->exp_sp_peer = LUSTRE_SP_ANY; |
| 854 | export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID; |
| 855 | export->exp_client_uuid = *cluuid; |
| 856 | obd_init_export(export); |
| 857 | |
| 858 | spin_lock(&obd->obd_dev_lock); |
| 859 | /* shouldn't happen, but might race */ |
| 860 | if (obd->obd_stopping) |
| 861 | GOTO(exit_unlock, rc = -ENODEV); |
| 862 | |
| 863 | hash = cfs_hash_getref(obd->obd_uuid_hash); |
| 864 | if (hash == NULL) |
| 865 | GOTO(exit_unlock, rc = -ENODEV); |
| 866 | spin_unlock(&obd->obd_dev_lock); |
| 867 | |
| 868 | if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) { |
| 869 | rc = cfs_hash_add_unique(hash, cluuid, &export->exp_uuid_hash); |
| 870 | if (rc != 0) { |
| 871 | LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n", |
| 872 | obd->obd_name, cluuid->uuid, rc); |
| 873 | GOTO(exit_err, rc = -EALREADY); |
| 874 | } |
| 875 | } |
| 876 | |
| 877 | spin_lock(&obd->obd_dev_lock); |
| 878 | if (obd->obd_stopping) { |
| 879 | cfs_hash_del(hash, cluuid, &export->exp_uuid_hash); |
| 880 | GOTO(exit_unlock, rc = -ENODEV); |
| 881 | } |
| 882 | |
| 883 | class_incref(obd, "export", export); |
| 884 | list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports); |
| 885 | list_add_tail(&export->exp_obd_chain_timed, |
| 886 | &export->exp_obd->obd_exports_timed); |
| 887 | export->exp_obd->obd_num_exports++; |
| 888 | spin_unlock(&obd->obd_dev_lock); |
| 889 | cfs_hash_putref(hash); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 890 | return export; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 891 | |
| 892 | exit_unlock: |
| 893 | spin_unlock(&obd->obd_dev_lock); |
| 894 | exit_err: |
| 895 | if (hash) |
| 896 | cfs_hash_putref(hash); |
| 897 | class_handle_unhash(&export->exp_handle); |
| 898 | LASSERT(hlist_unhashed(&export->exp_uuid_hash)); |
| 899 | obd_destroy_export(export); |
| 900 | OBD_FREE_PTR(export); |
| 901 | return ERR_PTR(rc); |
| 902 | } |
| 903 | EXPORT_SYMBOL(class_new_export); |
| 904 | |
| 905 | void class_unlink_export(struct obd_export *exp) |
| 906 | { |
| 907 | class_handle_unhash(&exp->exp_handle); |
| 908 | |
| 909 | spin_lock(&exp->exp_obd->obd_dev_lock); |
| 910 | /* delete an uuid-export hashitem from hashtables */ |
| 911 | if (!hlist_unhashed(&exp->exp_uuid_hash)) |
| 912 | cfs_hash_del(exp->exp_obd->obd_uuid_hash, |
| 913 | &exp->exp_client_uuid, |
| 914 | &exp->exp_uuid_hash); |
| 915 | |
| 916 | list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports); |
| 917 | list_del_init(&exp->exp_obd_chain_timed); |
| 918 | exp->exp_obd->obd_num_exports--; |
| 919 | spin_unlock(&exp->exp_obd->obd_dev_lock); |
| 920 | class_export_put(exp); |
| 921 | } |
| 922 | EXPORT_SYMBOL(class_unlink_export); |
| 923 | |
| 924 | /* Import management functions */ |
| 925 | void class_import_destroy(struct obd_import *imp) |
| 926 | { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 927 | CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp, |
| 928 | imp->imp_obd->obd_name); |
| 929 | |
| 930 | LASSERT_ATOMIC_ZERO(&imp->imp_refcount); |
| 931 | |
| 932 | ptlrpc_put_connection_superhack(imp->imp_connection); |
| 933 | |
| 934 | while (!list_empty(&imp->imp_conn_list)) { |
| 935 | struct obd_import_conn *imp_conn; |
| 936 | |
| 937 | imp_conn = list_entry(imp->imp_conn_list.next, |
| 938 | struct obd_import_conn, oic_item); |
| 939 | list_del_init(&imp_conn->oic_item); |
| 940 | ptlrpc_put_connection_superhack(imp_conn->oic_conn); |
| 941 | OBD_FREE(imp_conn, sizeof(*imp_conn)); |
| 942 | } |
| 943 | |
| 944 | LASSERT(imp->imp_sec == NULL); |
| 945 | class_decref(imp->imp_obd, "import", imp); |
| 946 | OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 947 | } |
| 948 | |
| 949 | static void import_handle_addref(void *import) |
| 950 | { |
| 951 | class_import_get(import); |
| 952 | } |
| 953 | |
| 954 | static struct portals_handle_ops import_handle_ops = { |
| 955 | .hop_addref = import_handle_addref, |
| 956 | .hop_free = NULL, |
| 957 | }; |
| 958 | |
| 959 | struct obd_import *class_import_get(struct obd_import *import) |
| 960 | { |
| 961 | atomic_inc(&import->imp_refcount); |
| 962 | CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import, |
| 963 | atomic_read(&import->imp_refcount), |
| 964 | import->imp_obd->obd_name); |
| 965 | return import; |
| 966 | } |
| 967 | EXPORT_SYMBOL(class_import_get); |
| 968 | |
| 969 | void class_import_put(struct obd_import *imp) |
| 970 | { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 971 | LASSERT(list_empty(&imp->imp_zombie_chain)); |
| 972 | LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON); |
| 973 | |
| 974 | CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp, |
| 975 | atomic_read(&imp->imp_refcount) - 1, |
| 976 | imp->imp_obd->obd_name); |
| 977 | |
| 978 | if (atomic_dec_and_test(&imp->imp_refcount)) { |
| 979 | CDEBUG(D_INFO, "final put import %p\n", imp); |
| 980 | obd_zombie_import_add(imp); |
| 981 | } |
| 982 | |
| 983 | /* catch possible import put race */ |
| 984 | LASSERT_ATOMIC_GE_LT(&imp->imp_refcount, 0, LI_POISON); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 985 | } |
| 986 | EXPORT_SYMBOL(class_import_put); |
| 987 | |
| 988 | static void init_imp_at(struct imp_at *at) { |
| 989 | int i; |
| 990 | at_init(&at->iat_net_latency, 0, 0); |
| 991 | for (i = 0; i < IMP_AT_MAX_PORTALS; i++) { |
| 992 | /* max service estimates are tracked on the server side, so |
| 993 | don't use the AT history here, just use the last reported |
| 994 | val. (But keep hist for proc histogram, worst_ever) */ |
| 995 | at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT, |
| 996 | AT_FLG_NOHIST); |
| 997 | } |
| 998 | } |
| 999 | |
| 1000 | struct obd_import *class_new_import(struct obd_device *obd) |
| 1001 | { |
| 1002 | struct obd_import *imp; |
| 1003 | |
| 1004 | OBD_ALLOC(imp, sizeof(*imp)); |
| 1005 | if (imp == NULL) |
| 1006 | return NULL; |
| 1007 | |
| 1008 | INIT_LIST_HEAD(&imp->imp_pinger_chain); |
| 1009 | INIT_LIST_HEAD(&imp->imp_zombie_chain); |
| 1010 | INIT_LIST_HEAD(&imp->imp_replay_list); |
| 1011 | INIT_LIST_HEAD(&imp->imp_sending_list); |
| 1012 | INIT_LIST_HEAD(&imp->imp_delayed_list); |
| 1013 | spin_lock_init(&imp->imp_lock); |
| 1014 | imp->imp_last_success_conn = 0; |
| 1015 | imp->imp_state = LUSTRE_IMP_NEW; |
| 1016 | imp->imp_obd = class_incref(obd, "import", imp); |
| 1017 | mutex_init(&imp->imp_sec_mutex); |
| 1018 | init_waitqueue_head(&imp->imp_recovery_waitq); |
| 1019 | |
| 1020 | atomic_set(&imp->imp_refcount, 2); |
| 1021 | atomic_set(&imp->imp_unregistering, 0); |
| 1022 | atomic_set(&imp->imp_inflight, 0); |
| 1023 | atomic_set(&imp->imp_replay_inflight, 0); |
| 1024 | atomic_set(&imp->imp_inval_count, 0); |
| 1025 | INIT_LIST_HEAD(&imp->imp_conn_list); |
| 1026 | INIT_LIST_HEAD(&imp->imp_handle.h_link); |
| 1027 | class_handle_hash(&imp->imp_handle, &import_handle_ops); |
| 1028 | init_imp_at(&imp->imp_at); |
| 1029 | |
| 1030 | /* the default magic is V2, will be used in connect RPC, and |
| 1031 | * then adjusted according to the flags in request/reply. */ |
| 1032 | imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2; |
| 1033 | |
| 1034 | return imp; |
| 1035 | } |
| 1036 | EXPORT_SYMBOL(class_new_import); |
| 1037 | |
| 1038 | void class_destroy_import(struct obd_import *import) |
| 1039 | { |
| 1040 | LASSERT(import != NULL); |
| 1041 | LASSERT(import != LP_POISON); |
| 1042 | |
| 1043 | class_handle_unhash(&import->imp_handle); |
| 1044 | |
| 1045 | spin_lock(&import->imp_lock); |
| 1046 | import->imp_generation++; |
| 1047 | spin_unlock(&import->imp_lock); |
| 1048 | class_import_put(import); |
| 1049 | } |
| 1050 | EXPORT_SYMBOL(class_destroy_import); |
| 1051 | |
| 1052 | #if LUSTRE_TRACKS_LOCK_EXP_REFS |
| 1053 | |
| 1054 | void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock) |
| 1055 | { |
| 1056 | spin_lock(&exp->exp_locks_list_guard); |
| 1057 | |
| 1058 | LASSERT(lock->l_exp_refs_nr >= 0); |
| 1059 | |
| 1060 | if (lock->l_exp_refs_target != NULL && |
| 1061 | lock->l_exp_refs_target != exp) { |
| 1062 | LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n", |
| 1063 | exp, lock, lock->l_exp_refs_target); |
| 1064 | } |
| 1065 | if ((lock->l_exp_refs_nr ++) == 0) { |
| 1066 | list_add(&lock->l_exp_refs_link, &exp->exp_locks_list); |
| 1067 | lock->l_exp_refs_target = exp; |
| 1068 | } |
| 1069 | CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n", |
| 1070 | lock, exp, lock->l_exp_refs_nr); |
| 1071 | spin_unlock(&exp->exp_locks_list_guard); |
| 1072 | } |
| 1073 | EXPORT_SYMBOL(__class_export_add_lock_ref); |
| 1074 | |
| 1075 | void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock) |
| 1076 | { |
| 1077 | spin_lock(&exp->exp_locks_list_guard); |
| 1078 | LASSERT(lock->l_exp_refs_nr > 0); |
| 1079 | if (lock->l_exp_refs_target != exp) { |
| 1080 | LCONSOLE_WARN("lock %p, " |
| 1081 | "mismatching export pointers: %p, %p\n", |
| 1082 | lock, lock->l_exp_refs_target, exp); |
| 1083 | } |
| 1084 | if (-- lock->l_exp_refs_nr == 0) { |
| 1085 | list_del_init(&lock->l_exp_refs_link); |
| 1086 | lock->l_exp_refs_target = NULL; |
| 1087 | } |
| 1088 | CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n", |
| 1089 | lock, exp, lock->l_exp_refs_nr); |
| 1090 | spin_unlock(&exp->exp_locks_list_guard); |
| 1091 | } |
| 1092 | EXPORT_SYMBOL(__class_export_del_lock_ref); |
| 1093 | #endif |
| 1094 | |
| 1095 | /* A connection defines an export context in which preallocation can |
| 1096 | be managed. This releases the export pointer reference, and returns |
| 1097 | the export handle, so the export refcount is 1 when this function |
| 1098 | returns. */ |
| 1099 | int class_connect(struct lustre_handle *conn, struct obd_device *obd, |
| 1100 | struct obd_uuid *cluuid) |
| 1101 | { |
| 1102 | struct obd_export *export; |
| 1103 | LASSERT(conn != NULL); |
| 1104 | LASSERT(obd != NULL); |
| 1105 | LASSERT(cluuid != NULL); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1106 | |
| 1107 | export = class_new_export(obd, cluuid); |
| 1108 | if (IS_ERR(export)) |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1109 | return PTR_ERR(export); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1110 | |
| 1111 | conn->cookie = export->exp_handle.h_cookie; |
| 1112 | class_export_put(export); |
| 1113 | |
| 1114 | CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n", |
| 1115 | cluuid->uuid, conn->cookie); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1116 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1117 | } |
| 1118 | EXPORT_SYMBOL(class_connect); |
| 1119 | |
| 1120 | /* if export is involved in recovery then clean up related things */ |
| 1121 | void class_export_recovery_cleanup(struct obd_export *exp) |
| 1122 | { |
| 1123 | struct obd_device *obd = exp->exp_obd; |
| 1124 | |
| 1125 | spin_lock(&obd->obd_recovery_task_lock); |
| 1126 | if (exp->exp_delayed) |
| 1127 | obd->obd_delayed_clients--; |
| 1128 | if (obd->obd_recovering) { |
| 1129 | if (exp->exp_in_recovery) { |
| 1130 | spin_lock(&exp->exp_lock); |
| 1131 | exp->exp_in_recovery = 0; |
| 1132 | spin_unlock(&exp->exp_lock); |
| 1133 | LASSERT_ATOMIC_POS(&obd->obd_connected_clients); |
| 1134 | atomic_dec(&obd->obd_connected_clients); |
| 1135 | } |
| 1136 | |
| 1137 | /* if called during recovery then should update |
| 1138 | * obd_stale_clients counter, |
| 1139 | * lightweight exports are not counted */ |
| 1140 | if (exp->exp_failed && |
| 1141 | (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0) |
| 1142 | exp->exp_obd->obd_stale_clients++; |
| 1143 | } |
| 1144 | spin_unlock(&obd->obd_recovery_task_lock); |
| 1145 | /** Cleanup req replay fields */ |
| 1146 | if (exp->exp_req_replay_needed) { |
| 1147 | spin_lock(&exp->exp_lock); |
| 1148 | exp->exp_req_replay_needed = 0; |
| 1149 | spin_unlock(&exp->exp_lock); |
| 1150 | LASSERT(atomic_read(&obd->obd_req_replay_clients)); |
| 1151 | atomic_dec(&obd->obd_req_replay_clients); |
| 1152 | } |
| 1153 | /** Cleanup lock replay data */ |
| 1154 | if (exp->exp_lock_replay_needed) { |
| 1155 | spin_lock(&exp->exp_lock); |
| 1156 | exp->exp_lock_replay_needed = 0; |
| 1157 | spin_unlock(&exp->exp_lock); |
| 1158 | LASSERT(atomic_read(&obd->obd_lock_replay_clients)); |
| 1159 | atomic_dec(&obd->obd_lock_replay_clients); |
| 1160 | } |
| 1161 | } |
| 1162 | |
| 1163 | /* This function removes 1-3 references from the export: |
| 1164 | * 1 - for export pointer passed |
| 1165 | * and if disconnect really need |
| 1166 | * 2 - removing from hash |
| 1167 | * 3 - in client_unlink_export |
| 1168 | * The export pointer passed to this function can destroyed */ |
| 1169 | int class_disconnect(struct obd_export *export) |
| 1170 | { |
| 1171 | int already_disconnected; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1172 | |
| 1173 | if (export == NULL) { |
| 1174 | CWARN("attempting to free NULL export %p\n", export); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1175 | return -EINVAL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1176 | } |
| 1177 | |
| 1178 | spin_lock(&export->exp_lock); |
| 1179 | already_disconnected = export->exp_disconnected; |
| 1180 | export->exp_disconnected = 1; |
| 1181 | spin_unlock(&export->exp_lock); |
| 1182 | |
| 1183 | /* class_cleanup(), abort_recovery(), and class_fail_export() |
| 1184 | * all end up in here, and if any of them race we shouldn't |
| 1185 | * call extra class_export_puts(). */ |
| 1186 | if (already_disconnected) { |
| 1187 | LASSERT(hlist_unhashed(&export->exp_nid_hash)); |
| 1188 | GOTO(no_disconn, already_disconnected); |
| 1189 | } |
| 1190 | |
| 1191 | CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n", |
| 1192 | export->exp_handle.h_cookie); |
| 1193 | |
| 1194 | if (!hlist_unhashed(&export->exp_nid_hash)) |
| 1195 | cfs_hash_del(export->exp_obd->obd_nid_hash, |
| 1196 | &export->exp_connection->c_peer.nid, |
| 1197 | &export->exp_nid_hash); |
| 1198 | |
| 1199 | class_export_recovery_cleanup(export); |
| 1200 | class_unlink_export(export); |
| 1201 | no_disconn: |
| 1202 | class_export_put(export); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1203 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1204 | } |
| 1205 | EXPORT_SYMBOL(class_disconnect); |
| 1206 | |
| 1207 | /* Return non-zero for a fully connected export */ |
| 1208 | int class_connected_export(struct obd_export *exp) |
| 1209 | { |
| 1210 | if (exp) { |
| 1211 | int connected; |
| 1212 | spin_lock(&exp->exp_lock); |
| 1213 | connected = (exp->exp_conn_cnt > 0); |
| 1214 | spin_unlock(&exp->exp_lock); |
| 1215 | return connected; |
| 1216 | } |
| 1217 | return 0; |
| 1218 | } |
| 1219 | EXPORT_SYMBOL(class_connected_export); |
| 1220 | |
| 1221 | static void class_disconnect_export_list(struct list_head *list, |
| 1222 | enum obd_option flags) |
| 1223 | { |
| 1224 | int rc; |
| 1225 | struct obd_export *exp; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1226 | |
| 1227 | /* It's possible that an export may disconnect itself, but |
| 1228 | * nothing else will be added to this list. */ |
| 1229 | while (!list_empty(list)) { |
| 1230 | exp = list_entry(list->next, struct obd_export, |
| 1231 | exp_obd_chain); |
| 1232 | /* need for safe call CDEBUG after obd_disconnect */ |
| 1233 | class_export_get(exp); |
| 1234 | |
| 1235 | spin_lock(&exp->exp_lock); |
| 1236 | exp->exp_flags = flags; |
| 1237 | spin_unlock(&exp->exp_lock); |
| 1238 | |
| 1239 | if (obd_uuid_equals(&exp->exp_client_uuid, |
| 1240 | &exp->exp_obd->obd_uuid)) { |
| 1241 | CDEBUG(D_HA, |
| 1242 | "exp %p export uuid == obd uuid, don't discon\n", |
| 1243 | exp); |
| 1244 | /* Need to delete this now so we don't end up pointing |
| 1245 | * to work_list later when this export is cleaned up. */ |
| 1246 | list_del_init(&exp->exp_obd_chain); |
| 1247 | class_export_put(exp); |
| 1248 | continue; |
| 1249 | } |
| 1250 | |
| 1251 | class_export_get(exp); |
| 1252 | CDEBUG(D_HA, "%s: disconnecting export at %s (%p), " |
| 1253 | "last request at "CFS_TIME_T"\n", |
| 1254 | exp->exp_obd->obd_name, obd_export_nid2str(exp), |
| 1255 | exp, exp->exp_last_request_time); |
| 1256 | /* release one export reference anyway */ |
| 1257 | rc = obd_disconnect(exp); |
| 1258 | |
| 1259 | CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n", |
| 1260 | obd_export_nid2str(exp), exp, rc); |
| 1261 | class_export_put(exp); |
| 1262 | } |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1263 | } |
| 1264 | |
| 1265 | void class_disconnect_exports(struct obd_device *obd) |
| 1266 | { |
| 1267 | struct list_head work_list; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1268 | |
| 1269 | /* Move all of the exports from obd_exports to a work list, en masse. */ |
| 1270 | INIT_LIST_HEAD(&work_list); |
| 1271 | spin_lock(&obd->obd_dev_lock); |
| 1272 | list_splice_init(&obd->obd_exports, &work_list); |
| 1273 | list_splice_init(&obd->obd_delayed_exports, &work_list); |
| 1274 | spin_unlock(&obd->obd_dev_lock); |
| 1275 | |
| 1276 | if (!list_empty(&work_list)) { |
| 1277 | CDEBUG(D_HA, "OBD device %d (%p) has exports, " |
| 1278 | "disconnecting them\n", obd->obd_minor, obd); |
| 1279 | class_disconnect_export_list(&work_list, |
| 1280 | exp_flags_from_obd(obd)); |
| 1281 | } else |
| 1282 | CDEBUG(D_HA, "OBD device %d (%p) has no exports\n", |
| 1283 | obd->obd_minor, obd); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1284 | } |
| 1285 | EXPORT_SYMBOL(class_disconnect_exports); |
| 1286 | |
| 1287 | /* Remove exports that have not completed recovery. |
| 1288 | */ |
| 1289 | void class_disconnect_stale_exports(struct obd_device *obd, |
| 1290 | int (*test_export)(struct obd_export *)) |
| 1291 | { |
| 1292 | struct list_head work_list; |
| 1293 | struct obd_export *exp, *n; |
| 1294 | int evicted = 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1295 | |
| 1296 | INIT_LIST_HEAD(&work_list); |
| 1297 | spin_lock(&obd->obd_dev_lock); |
| 1298 | list_for_each_entry_safe(exp, n, &obd->obd_exports, |
| 1299 | exp_obd_chain) { |
| 1300 | /* don't count self-export as client */ |
| 1301 | if (obd_uuid_equals(&exp->exp_client_uuid, |
| 1302 | &exp->exp_obd->obd_uuid)) |
| 1303 | continue; |
| 1304 | |
| 1305 | /* don't evict clients which have no slot in last_rcvd |
| 1306 | * (e.g. lightweight connection) */ |
| 1307 | if (exp->exp_target_data.ted_lr_idx == -1) |
| 1308 | continue; |
| 1309 | |
| 1310 | spin_lock(&exp->exp_lock); |
| 1311 | if (exp->exp_failed || test_export(exp)) { |
| 1312 | spin_unlock(&exp->exp_lock); |
| 1313 | continue; |
| 1314 | } |
| 1315 | exp->exp_failed = 1; |
| 1316 | spin_unlock(&exp->exp_lock); |
| 1317 | |
| 1318 | list_move(&exp->exp_obd_chain, &work_list); |
| 1319 | evicted++; |
| 1320 | CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n", |
| 1321 | obd->obd_name, exp->exp_client_uuid.uuid, |
| 1322 | exp->exp_connection == NULL ? "<unknown>" : |
| 1323 | libcfs_nid2str(exp->exp_connection->c_peer.nid)); |
| 1324 | print_export_data(exp, "EVICTING", 0); |
| 1325 | } |
| 1326 | spin_unlock(&obd->obd_dev_lock); |
| 1327 | |
| 1328 | if (evicted) |
| 1329 | LCONSOLE_WARN("%s: disconnecting %d stale clients\n", |
| 1330 | obd->obd_name, evicted); |
| 1331 | |
| 1332 | class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) | |
| 1333 | OBD_OPT_ABORT_RECOV); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1334 | } |
| 1335 | EXPORT_SYMBOL(class_disconnect_stale_exports); |
| 1336 | |
| 1337 | void class_fail_export(struct obd_export *exp) |
| 1338 | { |
| 1339 | int rc, already_failed; |
| 1340 | |
| 1341 | spin_lock(&exp->exp_lock); |
| 1342 | already_failed = exp->exp_failed; |
| 1343 | exp->exp_failed = 1; |
| 1344 | spin_unlock(&exp->exp_lock); |
| 1345 | |
| 1346 | if (already_failed) { |
| 1347 | CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n", |
| 1348 | exp, exp->exp_client_uuid.uuid); |
| 1349 | return; |
| 1350 | } |
| 1351 | |
| 1352 | CDEBUG(D_HA, "disconnecting export %p/%s\n", |
| 1353 | exp, exp->exp_client_uuid.uuid); |
| 1354 | |
| 1355 | if (obd_dump_on_timeout) |
| 1356 | libcfs_debug_dumplog(); |
| 1357 | |
| 1358 | /* need for safe call CDEBUG after obd_disconnect */ |
| 1359 | class_export_get(exp); |
| 1360 | |
| 1361 | /* Most callers into obd_disconnect are removing their own reference |
| 1362 | * (request, for example) in addition to the one from the hash table. |
| 1363 | * We don't have such a reference here, so make one. */ |
| 1364 | class_export_get(exp); |
| 1365 | rc = obd_disconnect(exp); |
| 1366 | if (rc) |
| 1367 | CERROR("disconnecting export %p failed: %d\n", exp, rc); |
| 1368 | else |
| 1369 | CDEBUG(D_HA, "disconnected export %p/%s\n", |
| 1370 | exp, exp->exp_client_uuid.uuid); |
| 1371 | class_export_put(exp); |
| 1372 | } |
| 1373 | EXPORT_SYMBOL(class_fail_export); |
| 1374 | |
| 1375 | char *obd_export_nid2str(struct obd_export *exp) |
| 1376 | { |
| 1377 | if (exp->exp_connection != NULL) |
| 1378 | return libcfs_nid2str(exp->exp_connection->c_peer.nid); |
| 1379 | |
| 1380 | return "(no nid)"; |
| 1381 | } |
| 1382 | EXPORT_SYMBOL(obd_export_nid2str); |
| 1383 | |
| 1384 | int obd_export_evict_by_nid(struct obd_device *obd, const char *nid) |
| 1385 | { |
Lisa Nguyen | 6da6eab | 2013-10-21 18:16:26 -0700 | [diff] [blame] | 1386 | struct cfs_hash *nid_hash; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1387 | struct obd_export *doomed_exp = NULL; |
| 1388 | int exports_evicted = 0; |
| 1389 | |
| 1390 | lnet_nid_t nid_key = libcfs_str2nid((char *)nid); |
| 1391 | |
| 1392 | spin_lock(&obd->obd_dev_lock); |
| 1393 | /* umount has run already, so evict thread should leave |
| 1394 | * its task to umount thread now */ |
| 1395 | if (obd->obd_stopping) { |
| 1396 | spin_unlock(&obd->obd_dev_lock); |
| 1397 | return exports_evicted; |
| 1398 | } |
| 1399 | nid_hash = obd->obd_nid_hash; |
| 1400 | cfs_hash_getref(nid_hash); |
| 1401 | spin_unlock(&obd->obd_dev_lock); |
| 1402 | |
| 1403 | do { |
| 1404 | doomed_exp = cfs_hash_lookup(nid_hash, &nid_key); |
| 1405 | if (doomed_exp == NULL) |
| 1406 | break; |
| 1407 | |
| 1408 | LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key, |
| 1409 | "nid %s found, wanted nid %s, requested nid %s\n", |
| 1410 | obd_export_nid2str(doomed_exp), |
| 1411 | libcfs_nid2str(nid_key), nid); |
| 1412 | LASSERTF(doomed_exp != obd->obd_self_export, |
| 1413 | "self-export is hashed by NID?\n"); |
| 1414 | exports_evicted++; |
| 1415 | LCONSOLE_WARN("%s: evicting %s (at %s) by administrative " |
| 1416 | "request\n", obd->obd_name, |
| 1417 | obd_uuid2str(&doomed_exp->exp_client_uuid), |
| 1418 | obd_export_nid2str(doomed_exp)); |
| 1419 | class_fail_export(doomed_exp); |
| 1420 | class_export_put(doomed_exp); |
| 1421 | } while (1); |
| 1422 | |
| 1423 | cfs_hash_putref(nid_hash); |
| 1424 | |
| 1425 | if (!exports_evicted) |
| 1426 | CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n", |
| 1427 | obd->obd_name, nid); |
| 1428 | return exports_evicted; |
| 1429 | } |
| 1430 | EXPORT_SYMBOL(obd_export_evict_by_nid); |
| 1431 | |
| 1432 | int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid) |
| 1433 | { |
Lisa Nguyen | 6da6eab | 2013-10-21 18:16:26 -0700 | [diff] [blame] | 1434 | struct cfs_hash *uuid_hash; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1435 | struct obd_export *doomed_exp = NULL; |
| 1436 | struct obd_uuid doomed_uuid; |
| 1437 | int exports_evicted = 0; |
| 1438 | |
| 1439 | spin_lock(&obd->obd_dev_lock); |
| 1440 | if (obd->obd_stopping) { |
| 1441 | spin_unlock(&obd->obd_dev_lock); |
| 1442 | return exports_evicted; |
| 1443 | } |
| 1444 | uuid_hash = obd->obd_uuid_hash; |
| 1445 | cfs_hash_getref(uuid_hash); |
| 1446 | spin_unlock(&obd->obd_dev_lock); |
| 1447 | |
| 1448 | obd_str2uuid(&doomed_uuid, uuid); |
| 1449 | if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) { |
| 1450 | CERROR("%s: can't evict myself\n", obd->obd_name); |
| 1451 | cfs_hash_putref(uuid_hash); |
| 1452 | return exports_evicted; |
| 1453 | } |
| 1454 | |
| 1455 | doomed_exp = cfs_hash_lookup(uuid_hash, &doomed_uuid); |
| 1456 | |
| 1457 | if (doomed_exp == NULL) { |
| 1458 | CERROR("%s: can't disconnect %s: no exports found\n", |
| 1459 | obd->obd_name, uuid); |
| 1460 | } else { |
Masanari Iida | c4f39553 | 2013-07-21 03:38:08 +0900 | [diff] [blame] | 1461 | CWARN("%s: evicting %s at administrative request\n", |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1462 | obd->obd_name, doomed_exp->exp_client_uuid.uuid); |
| 1463 | class_fail_export(doomed_exp); |
| 1464 | class_export_put(doomed_exp); |
| 1465 | exports_evicted++; |
| 1466 | } |
| 1467 | cfs_hash_putref(uuid_hash); |
| 1468 | |
| 1469 | return exports_evicted; |
| 1470 | } |
| 1471 | EXPORT_SYMBOL(obd_export_evict_by_uuid); |
| 1472 | |
| 1473 | #if LUSTRE_TRACKS_LOCK_EXP_REFS |
| 1474 | void (*class_export_dump_hook)(struct obd_export*) = NULL; |
| 1475 | EXPORT_SYMBOL(class_export_dump_hook); |
| 1476 | #endif |
| 1477 | |
| 1478 | static void print_export_data(struct obd_export *exp, const char *status, |
| 1479 | int locks) |
| 1480 | { |
| 1481 | struct ptlrpc_reply_state *rs; |
| 1482 | struct ptlrpc_reply_state *first_reply = NULL; |
| 1483 | int nreplies = 0; |
| 1484 | |
| 1485 | spin_lock(&exp->exp_lock); |
| 1486 | list_for_each_entry(rs, &exp->exp_outstanding_replies, |
| 1487 | rs_exp_list) { |
| 1488 | if (nreplies == 0) |
| 1489 | first_reply = rs; |
| 1490 | nreplies++; |
| 1491 | } |
| 1492 | spin_unlock(&exp->exp_lock); |
| 1493 | |
| 1494 | CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n", |
| 1495 | exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid, |
| 1496 | obd_export_nid2str(exp), atomic_read(&exp->exp_refcount), |
| 1497 | atomic_read(&exp->exp_rpc_count), |
| 1498 | atomic_read(&exp->exp_cb_count), |
| 1499 | atomic_read(&exp->exp_locks_count), |
| 1500 | exp->exp_disconnected, exp->exp_delayed, exp->exp_failed, |
| 1501 | nreplies, first_reply, nreplies > 3 ? "..." : "", |
| 1502 | exp->exp_last_committed); |
| 1503 | #if LUSTRE_TRACKS_LOCK_EXP_REFS |
| 1504 | if (locks && class_export_dump_hook != NULL) |
| 1505 | class_export_dump_hook(exp); |
| 1506 | #endif |
| 1507 | } |
| 1508 | |
| 1509 | void dump_exports(struct obd_device *obd, int locks) |
| 1510 | { |
| 1511 | struct obd_export *exp; |
| 1512 | |
| 1513 | spin_lock(&obd->obd_dev_lock); |
| 1514 | list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) |
| 1515 | print_export_data(exp, "ACTIVE", locks); |
| 1516 | list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain) |
| 1517 | print_export_data(exp, "UNLINKED", locks); |
| 1518 | list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain) |
| 1519 | print_export_data(exp, "DELAYED", locks); |
| 1520 | spin_unlock(&obd->obd_dev_lock); |
| 1521 | spin_lock(&obd_zombie_impexp_lock); |
| 1522 | list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain) |
| 1523 | print_export_data(exp, "ZOMBIE", locks); |
| 1524 | spin_unlock(&obd_zombie_impexp_lock); |
| 1525 | } |
| 1526 | EXPORT_SYMBOL(dump_exports); |
| 1527 | |
| 1528 | void obd_exports_barrier(struct obd_device *obd) |
| 1529 | { |
| 1530 | int waited = 2; |
| 1531 | LASSERT(list_empty(&obd->obd_exports)); |
| 1532 | spin_lock(&obd->obd_dev_lock); |
| 1533 | while (!list_empty(&obd->obd_unlinked_exports)) { |
| 1534 | spin_unlock(&obd->obd_dev_lock); |
| 1535 | schedule_timeout_and_set_state(TASK_UNINTERRUPTIBLE, |
| 1536 | cfs_time_seconds(waited)); |
| 1537 | if (waited > 5 && IS_PO2(waited)) { |
| 1538 | LCONSOLE_WARN("%s is waiting for obd_unlinked_exports " |
| 1539 | "more than %d seconds. " |
| 1540 | "The obd refcount = %d. Is it stuck?\n", |
| 1541 | obd->obd_name, waited, |
| 1542 | atomic_read(&obd->obd_refcount)); |
| 1543 | dump_exports(obd, 1); |
| 1544 | } |
| 1545 | waited *= 2; |
| 1546 | spin_lock(&obd->obd_dev_lock); |
| 1547 | } |
| 1548 | spin_unlock(&obd->obd_dev_lock); |
| 1549 | } |
| 1550 | EXPORT_SYMBOL(obd_exports_barrier); |
| 1551 | |
| 1552 | /* Total amount of zombies to be destroyed */ |
| 1553 | static int zombies_count = 0; |
| 1554 | |
| 1555 | /** |
| 1556 | * kill zombie imports and exports |
| 1557 | */ |
| 1558 | void obd_zombie_impexp_cull(void) |
| 1559 | { |
| 1560 | struct obd_import *import; |
| 1561 | struct obd_export *export; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1562 | |
| 1563 | do { |
| 1564 | spin_lock(&obd_zombie_impexp_lock); |
| 1565 | |
| 1566 | import = NULL; |
| 1567 | if (!list_empty(&obd_zombie_imports)) { |
| 1568 | import = list_entry(obd_zombie_imports.next, |
| 1569 | struct obd_import, |
| 1570 | imp_zombie_chain); |
| 1571 | list_del_init(&import->imp_zombie_chain); |
| 1572 | } |
| 1573 | |
| 1574 | export = NULL; |
| 1575 | if (!list_empty(&obd_zombie_exports)) { |
| 1576 | export = list_entry(obd_zombie_exports.next, |
| 1577 | struct obd_export, |
| 1578 | exp_obd_chain); |
| 1579 | list_del_init(&export->exp_obd_chain); |
| 1580 | } |
| 1581 | |
| 1582 | spin_unlock(&obd_zombie_impexp_lock); |
| 1583 | |
| 1584 | if (import != NULL) { |
| 1585 | class_import_destroy(import); |
| 1586 | spin_lock(&obd_zombie_impexp_lock); |
| 1587 | zombies_count--; |
| 1588 | spin_unlock(&obd_zombie_impexp_lock); |
| 1589 | } |
| 1590 | |
| 1591 | if (export != NULL) { |
| 1592 | class_export_destroy(export); |
| 1593 | spin_lock(&obd_zombie_impexp_lock); |
| 1594 | zombies_count--; |
| 1595 | spin_unlock(&obd_zombie_impexp_lock); |
| 1596 | } |
| 1597 | |
| 1598 | cond_resched(); |
| 1599 | } while (import != NULL || export != NULL); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1600 | } |
| 1601 | |
| 1602 | static struct completion obd_zombie_start; |
| 1603 | static struct completion obd_zombie_stop; |
| 1604 | static unsigned long obd_zombie_flags; |
| 1605 | static wait_queue_head_t obd_zombie_waitq; |
| 1606 | static pid_t obd_zombie_pid; |
| 1607 | |
| 1608 | enum { |
| 1609 | OBD_ZOMBIE_STOP = 0x0001, |
| 1610 | }; |
| 1611 | |
| 1612 | /** |
| 1613 | * check for work for kill zombie import/export thread. |
| 1614 | */ |
| 1615 | static int obd_zombie_impexp_check(void *arg) |
| 1616 | { |
| 1617 | int rc; |
| 1618 | |
| 1619 | spin_lock(&obd_zombie_impexp_lock); |
| 1620 | rc = (zombies_count == 0) && |
| 1621 | !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags); |
| 1622 | spin_unlock(&obd_zombie_impexp_lock); |
| 1623 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1624 | return rc; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1625 | } |
| 1626 | |
| 1627 | /** |
Masanari Iida | 52cf6ac | 2014-02-15 01:11:17 +0900 | [diff] [blame^] | 1628 | * Add export to the obd_zombie thread and notify it. |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1629 | */ |
| 1630 | static void obd_zombie_export_add(struct obd_export *exp) { |
| 1631 | spin_lock(&exp->exp_obd->obd_dev_lock); |
| 1632 | LASSERT(!list_empty(&exp->exp_obd_chain)); |
| 1633 | list_del_init(&exp->exp_obd_chain); |
| 1634 | spin_unlock(&exp->exp_obd->obd_dev_lock); |
| 1635 | spin_lock(&obd_zombie_impexp_lock); |
| 1636 | zombies_count++; |
| 1637 | list_add(&exp->exp_obd_chain, &obd_zombie_exports); |
| 1638 | spin_unlock(&obd_zombie_impexp_lock); |
| 1639 | |
| 1640 | obd_zombie_impexp_notify(); |
| 1641 | } |
| 1642 | |
| 1643 | /** |
Masanari Iida | 52cf6ac | 2014-02-15 01:11:17 +0900 | [diff] [blame^] | 1644 | * Add import to the obd_zombie thread and notify it. |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1645 | */ |
| 1646 | static void obd_zombie_import_add(struct obd_import *imp) { |
| 1647 | LASSERT(imp->imp_sec == NULL); |
| 1648 | LASSERT(imp->imp_rq_pool == NULL); |
| 1649 | spin_lock(&obd_zombie_impexp_lock); |
| 1650 | LASSERT(list_empty(&imp->imp_zombie_chain)); |
| 1651 | zombies_count++; |
| 1652 | list_add(&imp->imp_zombie_chain, &obd_zombie_imports); |
| 1653 | spin_unlock(&obd_zombie_impexp_lock); |
| 1654 | |
| 1655 | obd_zombie_impexp_notify(); |
| 1656 | } |
| 1657 | |
| 1658 | /** |
| 1659 | * notify import/export destroy thread about new zombie. |
| 1660 | */ |
| 1661 | static void obd_zombie_impexp_notify(void) |
| 1662 | { |
| 1663 | /* |
Masanari Iida | 52cf6ac | 2014-02-15 01:11:17 +0900 | [diff] [blame^] | 1664 | * Make sure obd_zombie_impexp_thread get this notification. |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1665 | * It is possible this signal only get by obd_zombie_barrier, and |
| 1666 | * barrier gulps this notification and sleeps away and hangs ensues |
| 1667 | */ |
| 1668 | wake_up_all(&obd_zombie_waitq); |
| 1669 | } |
| 1670 | |
| 1671 | /** |
| 1672 | * check whether obd_zombie is idle |
| 1673 | */ |
| 1674 | static int obd_zombie_is_idle(void) |
| 1675 | { |
| 1676 | int rc; |
| 1677 | |
| 1678 | LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)); |
| 1679 | spin_lock(&obd_zombie_impexp_lock); |
| 1680 | rc = (zombies_count == 0); |
| 1681 | spin_unlock(&obd_zombie_impexp_lock); |
| 1682 | return rc; |
| 1683 | } |
| 1684 | |
| 1685 | /** |
| 1686 | * wait when obd_zombie import/export queues become empty |
| 1687 | */ |
| 1688 | void obd_zombie_barrier(void) |
| 1689 | { |
| 1690 | struct l_wait_info lwi = { 0 }; |
| 1691 | |
| 1692 | if (obd_zombie_pid == current_pid()) |
| 1693 | /* don't wait for myself */ |
| 1694 | return; |
| 1695 | l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi); |
| 1696 | } |
| 1697 | EXPORT_SYMBOL(obd_zombie_barrier); |
| 1698 | |
| 1699 | |
| 1700 | /** |
| 1701 | * destroy zombie export/import thread. |
| 1702 | */ |
| 1703 | static int obd_zombie_impexp_thread(void *unused) |
| 1704 | { |
| 1705 | unshare_fs_struct(); |
| 1706 | complete(&obd_zombie_start); |
| 1707 | |
| 1708 | obd_zombie_pid = current_pid(); |
| 1709 | |
| 1710 | while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) { |
| 1711 | struct l_wait_info lwi = { 0 }; |
| 1712 | |
| 1713 | l_wait_event(obd_zombie_waitq, |
| 1714 | !obd_zombie_impexp_check(NULL), &lwi); |
| 1715 | obd_zombie_impexp_cull(); |
| 1716 | |
| 1717 | /* |
| 1718 | * Notify obd_zombie_barrier callers that queues |
| 1719 | * may be empty. |
| 1720 | */ |
| 1721 | wake_up(&obd_zombie_waitq); |
| 1722 | } |
| 1723 | |
| 1724 | complete(&obd_zombie_stop); |
| 1725 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1726 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1727 | } |
| 1728 | |
| 1729 | |
| 1730 | /** |
| 1731 | * start destroy zombie import/export thread |
| 1732 | */ |
| 1733 | int obd_zombie_impexp_init(void) |
| 1734 | { |
Greg Kroah-Hartman | 68b636b | 2013-08-04 08:56:42 +0800 | [diff] [blame] | 1735 | struct task_struct *task; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1736 | |
| 1737 | INIT_LIST_HEAD(&obd_zombie_imports); |
| 1738 | INIT_LIST_HEAD(&obd_zombie_exports); |
| 1739 | spin_lock_init(&obd_zombie_impexp_lock); |
| 1740 | init_completion(&obd_zombie_start); |
| 1741 | init_completion(&obd_zombie_stop); |
| 1742 | init_waitqueue_head(&obd_zombie_waitq); |
| 1743 | obd_zombie_pid = 0; |
| 1744 | |
| 1745 | task = kthread_run(obd_zombie_impexp_thread, NULL, "obd_zombid"); |
| 1746 | if (IS_ERR(task)) |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1747 | return PTR_ERR(task); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1748 | |
| 1749 | wait_for_completion(&obd_zombie_start); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1750 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1751 | } |
| 1752 | /** |
| 1753 | * stop destroy zombie import/export thread |
| 1754 | */ |
| 1755 | void obd_zombie_impexp_stop(void) |
| 1756 | { |
| 1757 | set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags); |
| 1758 | obd_zombie_impexp_notify(); |
| 1759 | wait_for_completion(&obd_zombie_stop); |
| 1760 | } |
| 1761 | |
| 1762 | /***** Kernel-userspace comm helpers *******/ |
| 1763 | |
| 1764 | /* Get length of entire message, including header */ |
| 1765 | int kuc_len(int payload_len) |
| 1766 | { |
| 1767 | return sizeof(struct kuc_hdr) + payload_len; |
| 1768 | } |
| 1769 | EXPORT_SYMBOL(kuc_len); |
| 1770 | |
| 1771 | /* Get a pointer to kuc header, given a ptr to the payload |
| 1772 | * @param p Pointer to payload area |
| 1773 | * @returns Pointer to kuc header |
| 1774 | */ |
| 1775 | struct kuc_hdr * kuc_ptr(void *p) |
| 1776 | { |
| 1777 | struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1; |
| 1778 | LASSERT(lh->kuc_magic == KUC_MAGIC); |
| 1779 | return lh; |
| 1780 | } |
| 1781 | EXPORT_SYMBOL(kuc_ptr); |
| 1782 | |
| 1783 | /* Test if payload is part of kuc message |
| 1784 | * @param p Pointer to payload area |
| 1785 | * @returns boolean |
| 1786 | */ |
| 1787 | int kuc_ispayload(void *p) |
| 1788 | { |
| 1789 | struct kuc_hdr *kh = ((struct kuc_hdr *)p) - 1; |
| 1790 | |
| 1791 | if (kh->kuc_magic == KUC_MAGIC) |
| 1792 | return 1; |
| 1793 | else |
| 1794 | return 0; |
| 1795 | } |
| 1796 | EXPORT_SYMBOL(kuc_ispayload); |
| 1797 | |
| 1798 | /* Alloc space for a message, and fill in header |
| 1799 | * @return Pointer to payload area |
| 1800 | */ |
| 1801 | void *kuc_alloc(int payload_len, int transport, int type) |
| 1802 | { |
| 1803 | struct kuc_hdr *lh; |
| 1804 | int len = kuc_len(payload_len); |
| 1805 | |
| 1806 | OBD_ALLOC(lh, len); |
| 1807 | if (lh == NULL) |
| 1808 | return ERR_PTR(-ENOMEM); |
| 1809 | |
| 1810 | lh->kuc_magic = KUC_MAGIC; |
| 1811 | lh->kuc_transport = transport; |
| 1812 | lh->kuc_msgtype = type; |
| 1813 | lh->kuc_msglen = len; |
| 1814 | |
| 1815 | return (void *)(lh + 1); |
| 1816 | } |
| 1817 | EXPORT_SYMBOL(kuc_alloc); |
| 1818 | |
| 1819 | /* Takes pointer to payload area */ |
| 1820 | inline void kuc_free(void *p, int payload_len) |
| 1821 | { |
| 1822 | struct kuc_hdr *lh = kuc_ptr(p); |
| 1823 | OBD_FREE(lh, kuc_len(payload_len)); |
| 1824 | } |
| 1825 | EXPORT_SYMBOL(kuc_free); |