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 |
Greg Kroah-Hartman | 610f737 | 2014-07-11 22:15:24 -0700 | [diff] [blame] | 43 | #include "../include/obd_class.h" |
| 44 | #include "../include/lprocfs_status.h" |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 45 | |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 46 | spinlock_t obd_types_lock; |
| 47 | |
| 48 | struct kmem_cache *obd_device_cachep; |
| 49 | struct kmem_cache *obdo_cachep; |
| 50 | EXPORT_SYMBOL(obdo_cachep); |
Haneen Mohammed | 052c529 | 2015-03-21 10:51:42 +0300 | [diff] [blame] | 51 | static struct kmem_cache *import_cachep; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 52 | |
Haneen Mohammed | 052c529 | 2015-03-21 10:51:42 +0300 | [diff] [blame] | 53 | static struct list_head obd_zombie_imports; |
| 54 | static struct list_head obd_zombie_exports; |
| 55 | static spinlock_t obd_zombie_impexp_lock; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 56 | static void obd_zombie_impexp_notify(void); |
| 57 | static void obd_zombie_export_add(struct obd_export *exp); |
| 58 | static void obd_zombie_import_add(struct obd_import *imp); |
| 59 | static void print_export_data(struct obd_export *exp, |
| 60 | const char *status, int locks); |
| 61 | |
| 62 | int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c); |
| 63 | EXPORT_SYMBOL(ptlrpc_put_connection_superhack); |
| 64 | |
| 65 | /* |
| 66 | * support functions: we could use inter-module communication, but this |
| 67 | * is more portable to other OS's |
| 68 | */ |
| 69 | static struct obd_device *obd_device_alloc(void) |
| 70 | { |
| 71 | struct obd_device *obd; |
| 72 | |
Ann Koehler | 0be19af | 2014-04-27 13:06:36 -0400 | [diff] [blame] | 73 | OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, GFP_NOFS); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 74 | if (obd != NULL) { |
| 75 | obd->obd_magic = OBD_DEVICE_MAGIC; |
| 76 | } |
| 77 | return obd; |
| 78 | } |
| 79 | |
| 80 | static void obd_device_free(struct obd_device *obd) |
| 81 | { |
| 82 | LASSERT(obd != NULL); |
| 83 | LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n", |
| 84 | obd, obd->obd_magic, OBD_DEVICE_MAGIC); |
| 85 | if (obd->obd_namespace != NULL) { |
| 86 | CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n", |
| 87 | obd, obd->obd_namespace, obd->obd_force); |
| 88 | LBUG(); |
| 89 | } |
| 90 | lu_ref_fini(&obd->obd_reference); |
| 91 | OBD_SLAB_FREE_PTR(obd, obd_device_cachep); |
| 92 | } |
| 93 | |
| 94 | struct obd_type *class_search_type(const char *name) |
| 95 | { |
| 96 | struct list_head *tmp; |
| 97 | struct obd_type *type; |
| 98 | |
| 99 | spin_lock(&obd_types_lock); |
| 100 | list_for_each(tmp, &obd_types) { |
| 101 | type = list_entry(tmp, struct obd_type, typ_chain); |
| 102 | if (strcmp(type->typ_name, name) == 0) { |
| 103 | spin_unlock(&obd_types_lock); |
| 104 | return type; |
| 105 | } |
| 106 | } |
| 107 | spin_unlock(&obd_types_lock); |
| 108 | return NULL; |
| 109 | } |
| 110 | EXPORT_SYMBOL(class_search_type); |
| 111 | |
| 112 | struct obd_type *class_get_type(const char *name) |
| 113 | { |
| 114 | struct obd_type *type = class_search_type(name); |
| 115 | |
| 116 | if (!type) { |
| 117 | const char *modname = name; |
| 118 | |
| 119 | if (strcmp(modname, "obdfilter") == 0) |
| 120 | modname = "ofd"; |
| 121 | |
| 122 | if (strcmp(modname, LUSTRE_LWP_NAME) == 0) |
| 123 | modname = LUSTRE_OSP_NAME; |
| 124 | |
| 125 | if (!strncmp(modname, LUSTRE_MDS_NAME, strlen(LUSTRE_MDS_NAME))) |
| 126 | modname = LUSTRE_MDT_NAME; |
| 127 | |
| 128 | if (!request_module("%s", modname)) { |
| 129 | CDEBUG(D_INFO, "Loaded module '%s'\n", modname); |
| 130 | type = class_search_type(name); |
| 131 | } else { |
| 132 | LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n", |
| 133 | modname); |
| 134 | } |
| 135 | } |
| 136 | if (type) { |
| 137 | spin_lock(&type->obd_type_lock); |
| 138 | type->typ_refcnt++; |
| 139 | try_module_get(type->typ_dt_ops->o_owner); |
| 140 | spin_unlock(&type->obd_type_lock); |
| 141 | } |
| 142 | return type; |
| 143 | } |
| 144 | EXPORT_SYMBOL(class_get_type); |
| 145 | |
| 146 | void class_put_type(struct obd_type *type) |
| 147 | { |
| 148 | LASSERT(type); |
| 149 | spin_lock(&type->obd_type_lock); |
| 150 | type->typ_refcnt--; |
| 151 | module_put(type->typ_dt_ops->o_owner); |
| 152 | spin_unlock(&type->obd_type_lock); |
| 153 | } |
| 154 | EXPORT_SYMBOL(class_put_type); |
| 155 | |
| 156 | #define CLASS_MAX_NAME 1024 |
| 157 | |
| 158 | int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, |
| 159 | struct lprocfs_vars *vars, const char *name, |
| 160 | struct lu_device_type *ldt) |
| 161 | { |
| 162 | struct obd_type *type; |
| 163 | int rc = 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 164 | |
| 165 | /* sanity check */ |
| 166 | LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME); |
| 167 | |
| 168 | if (class_search_type(name)) { |
| 169 | CDEBUG(D_IOCTL, "Type %s already registered\n", name); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 170 | return -EEXIST; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | rc = -ENOMEM; |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 174 | type = kzalloc(sizeof(*type), GFP_NOFS); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 175 | if (type == NULL) |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 176 | return rc; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 177 | |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 178 | type->typ_dt_ops = kzalloc(sizeof(*type->typ_dt_ops), GFP_NOFS); |
| 179 | type->typ_md_ops = kzalloc(sizeof(*type->typ_md_ops), GFP_NOFS); |
| 180 | type->typ_name = kzalloc(strlen(name) + 1, GFP_NOFS); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 181 | |
| 182 | if (type->typ_dt_ops == NULL || |
| 183 | type->typ_md_ops == NULL || |
| 184 | type->typ_name == NULL) |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 185 | goto failed; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 186 | |
| 187 | *(type->typ_dt_ops) = *dt_ops; |
| 188 | /* md_ops is optional */ |
| 189 | if (md_ops) |
| 190 | *(type->typ_md_ops) = *md_ops; |
| 191 | strcpy(type->typ_name, name); |
| 192 | spin_lock_init(&type->obd_type_lock); |
| 193 | |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 194 | type->typ_procroot = lprocfs_register(type->typ_name, proc_lustre_root, |
| 195 | vars, type); |
| 196 | if (IS_ERR(type->typ_procroot)) { |
| 197 | rc = PTR_ERR(type->typ_procroot); |
| 198 | type->typ_procroot = NULL; |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 199 | goto failed; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 200 | } |
Peng Tao | 8cc420d | 2013-12-03 22:41:59 +0800 | [diff] [blame] | 201 | |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 202 | if (ldt != NULL) { |
| 203 | type->typ_lu = ldt; |
| 204 | rc = lu_device_type_init(ldt); |
| 205 | if (rc != 0) |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 206 | goto failed; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | spin_lock(&obd_types_lock); |
| 210 | list_add(&type->typ_chain, &obd_types); |
| 211 | spin_unlock(&obd_types_lock); |
| 212 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 213 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 214 | |
| 215 | failed: |
Julia Lawall | ba99a0a | 2015-05-01 21:37:55 +0200 | [diff] [blame^] | 216 | kfree(type->typ_name); |
| 217 | kfree(type->typ_md_ops); |
| 218 | kfree(type->typ_dt_ops); |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 219 | kfree(type); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 220 | return rc; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 221 | } |
| 222 | EXPORT_SYMBOL(class_register_type); |
| 223 | |
| 224 | int class_unregister_type(const char *name) |
| 225 | { |
| 226 | struct obd_type *type = class_search_type(name); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 227 | |
| 228 | if (!type) { |
| 229 | CERROR("unknown obd type\n"); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 230 | return -EINVAL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | if (type->typ_refcnt) { |
| 234 | CERROR("type %s has refcount (%d)\n", name, type->typ_refcnt); |
| 235 | /* This is a bad situation, let's make the best of it */ |
| 236 | /* Remove ops, but leave the name for debugging */ |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 237 | kfree(type->typ_dt_ops); |
| 238 | kfree(type->typ_md_ops); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 239 | return -EBUSY; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 240 | } |
| 241 | |
Peng Tao | 73bb1da | 2013-05-29 21:40:55 +0800 | [diff] [blame] | 242 | if (type->typ_procroot) { |
| 243 | lprocfs_remove(&type->typ_procroot); |
| 244 | } |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 245 | |
| 246 | if (type->typ_lu) |
| 247 | lu_device_type_fini(type->typ_lu); |
| 248 | |
| 249 | spin_lock(&obd_types_lock); |
| 250 | list_del(&type->typ_chain); |
| 251 | spin_unlock(&obd_types_lock); |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 252 | kfree(type->typ_name); |
Julia Lawall | ba99a0a | 2015-05-01 21:37:55 +0200 | [diff] [blame^] | 253 | kfree(type->typ_dt_ops); |
| 254 | kfree(type->typ_md_ops); |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 255 | kfree(type); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 256 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 257 | } /* class_unregister_type */ |
| 258 | EXPORT_SYMBOL(class_unregister_type); |
| 259 | |
| 260 | /** |
| 261 | * Create a new obd device. |
| 262 | * |
| 263 | * Find an empty slot in ::obd_devs[], create a new obd device in it. |
| 264 | * |
| 265 | * \param[in] type_name obd device type string. |
| 266 | * \param[in] name obd device name. |
| 267 | * |
| 268 | * \retval NULL if create fails, otherwise return the obd device |
| 269 | * pointer created. |
| 270 | */ |
| 271 | struct obd_device *class_newdev(const char *type_name, const char *name) |
| 272 | { |
| 273 | struct obd_device *result = NULL; |
| 274 | struct obd_device *newdev; |
| 275 | struct obd_type *type = NULL; |
| 276 | int i; |
| 277 | int new_obd_minor = 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 278 | |
| 279 | if (strlen(name) >= MAX_OBD_NAME) { |
| 280 | 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] | 281 | return ERR_PTR(-EINVAL); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 282 | } |
| 283 | |
| 284 | type = class_get_type(type_name); |
| 285 | if (type == NULL){ |
| 286 | CERROR("OBD: unknown type: %s\n", type_name); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 287 | return ERR_PTR(-ENODEV); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | newdev = obd_device_alloc(); |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 291 | if (newdev == NULL) { |
| 292 | result = ERR_PTR(-ENOMEM); |
| 293 | goto out_type; |
| 294 | } |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 295 | |
| 296 | LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC); |
| 297 | |
| 298 | write_lock(&obd_dev_lock); |
| 299 | for (i = 0; i < class_devno_max(); i++) { |
| 300 | struct obd_device *obd = class_num2obd(i); |
| 301 | |
| 302 | if (obd && (strcmp(name, obd->obd_name) == 0)) { |
| 303 | CERROR("Device %s already exists at %d, won't add\n", |
| 304 | name, i); |
| 305 | if (result) { |
| 306 | LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC, |
| 307 | "%p obd_magic %08x != %08x\n", result, |
| 308 | result->obd_magic, OBD_DEVICE_MAGIC); |
| 309 | LASSERTF(result->obd_minor == new_obd_minor, |
| 310 | "%p obd_minor %d != %d\n", result, |
| 311 | result->obd_minor, new_obd_minor); |
| 312 | |
| 313 | obd_devs[result->obd_minor] = NULL; |
Greg Donald | 31e7213 | 2014-10-20 11:42:36 -0500 | [diff] [blame] | 314 | result->obd_name[0] = '\0'; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 315 | } |
| 316 | result = ERR_PTR(-EEXIST); |
| 317 | break; |
| 318 | } |
| 319 | if (!result && !obd) { |
| 320 | result = newdev; |
| 321 | result->obd_minor = i; |
| 322 | new_obd_minor = i; |
| 323 | result->obd_type = type; |
| 324 | strncpy(result->obd_name, name, |
| 325 | sizeof(result->obd_name) - 1); |
| 326 | obd_devs[i] = result; |
| 327 | } |
| 328 | } |
| 329 | write_unlock(&obd_dev_lock); |
| 330 | |
| 331 | if (result == NULL && i >= class_devno_max()) { |
| 332 | CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n", |
| 333 | class_devno_max()); |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 334 | result = ERR_PTR(-EOVERFLOW); |
| 335 | goto out; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 336 | } |
| 337 | |
| 338 | if (IS_ERR(result)) |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 339 | goto out; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 340 | |
| 341 | CDEBUG(D_IOCTL, "Adding new device %s (%p)\n", |
| 342 | result->obd_name, result); |
| 343 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 344 | return result; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 345 | out: |
| 346 | obd_device_free(newdev); |
| 347 | out_type: |
| 348 | class_put_type(type); |
| 349 | return result; |
| 350 | } |
| 351 | |
| 352 | void class_release_dev(struct obd_device *obd) |
| 353 | { |
| 354 | struct obd_type *obd_type = obd->obd_type; |
| 355 | |
| 356 | LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n", |
| 357 | obd, obd->obd_magic, OBD_DEVICE_MAGIC); |
| 358 | LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n", |
| 359 | obd, obd->obd_minor, obd_devs[obd->obd_minor]); |
| 360 | LASSERT(obd_type != NULL); |
| 361 | |
| 362 | CDEBUG(D_INFO, "Release obd device %s at %d obd_type name =%s\n", |
| 363 | obd->obd_name, obd->obd_minor, obd->obd_type->typ_name); |
| 364 | |
| 365 | write_lock(&obd_dev_lock); |
| 366 | obd_devs[obd->obd_minor] = NULL; |
| 367 | write_unlock(&obd_dev_lock); |
| 368 | obd_device_free(obd); |
| 369 | |
| 370 | class_put_type(obd_type); |
| 371 | } |
| 372 | |
| 373 | int class_name2dev(const char *name) |
| 374 | { |
| 375 | int i; |
| 376 | |
| 377 | if (!name) |
| 378 | return -1; |
| 379 | |
| 380 | read_lock(&obd_dev_lock); |
| 381 | for (i = 0; i < class_devno_max(); i++) { |
| 382 | struct obd_device *obd = class_num2obd(i); |
| 383 | |
| 384 | if (obd && strcmp(name, obd->obd_name) == 0) { |
| 385 | /* Make sure we finished attaching before we give |
| 386 | out any references */ |
| 387 | LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC); |
| 388 | if (obd->obd_attached) { |
| 389 | read_unlock(&obd_dev_lock); |
| 390 | return i; |
| 391 | } |
| 392 | break; |
| 393 | } |
| 394 | } |
| 395 | read_unlock(&obd_dev_lock); |
| 396 | |
| 397 | return -1; |
| 398 | } |
| 399 | EXPORT_SYMBOL(class_name2dev); |
| 400 | |
| 401 | struct obd_device *class_name2obd(const char *name) |
| 402 | { |
| 403 | int dev = class_name2dev(name); |
| 404 | |
| 405 | if (dev < 0 || dev > class_devno_max()) |
| 406 | return NULL; |
| 407 | return class_num2obd(dev); |
| 408 | } |
| 409 | EXPORT_SYMBOL(class_name2obd); |
| 410 | |
| 411 | int class_uuid2dev(struct obd_uuid *uuid) |
| 412 | { |
| 413 | int i; |
| 414 | |
| 415 | read_lock(&obd_dev_lock); |
| 416 | for (i = 0; i < class_devno_max(); i++) { |
| 417 | struct obd_device *obd = class_num2obd(i); |
| 418 | |
| 419 | if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) { |
| 420 | LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC); |
| 421 | read_unlock(&obd_dev_lock); |
| 422 | return i; |
| 423 | } |
| 424 | } |
| 425 | read_unlock(&obd_dev_lock); |
| 426 | |
| 427 | return -1; |
| 428 | } |
| 429 | EXPORT_SYMBOL(class_uuid2dev); |
| 430 | |
| 431 | struct obd_device *class_uuid2obd(struct obd_uuid *uuid) |
| 432 | { |
| 433 | int dev = class_uuid2dev(uuid); |
| 434 | if (dev < 0) |
| 435 | return NULL; |
| 436 | return class_num2obd(dev); |
| 437 | } |
| 438 | EXPORT_SYMBOL(class_uuid2obd); |
| 439 | |
| 440 | /** |
| 441 | * Get obd device from ::obd_devs[] |
| 442 | * |
| 443 | * \param num [in] array index |
| 444 | * |
| 445 | * \retval NULL if ::obd_devs[\a num] does not contains an obd device |
| 446 | * otherwise return the obd device there. |
| 447 | */ |
| 448 | struct obd_device *class_num2obd(int num) |
| 449 | { |
| 450 | struct obd_device *obd = NULL; |
| 451 | |
| 452 | if (num < class_devno_max()) { |
| 453 | obd = obd_devs[num]; |
| 454 | if (obd == NULL) |
| 455 | return NULL; |
| 456 | |
| 457 | LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, |
| 458 | "%p obd_magic %08x != %08x\n", |
| 459 | obd, obd->obd_magic, OBD_DEVICE_MAGIC); |
| 460 | LASSERTF(obd->obd_minor == num, |
| 461 | "%p obd_minor %0d != %0d\n", |
| 462 | obd, obd->obd_minor, num); |
| 463 | } |
| 464 | |
| 465 | return obd; |
| 466 | } |
| 467 | EXPORT_SYMBOL(class_num2obd); |
| 468 | |
| 469 | /** |
| 470 | * Get obd devices count. Device in any |
| 471 | * state are counted |
| 472 | * \retval obd device count |
| 473 | */ |
| 474 | int get_devices_count(void) |
| 475 | { |
| 476 | int index, max_index = class_devno_max(), dev_count = 0; |
| 477 | |
| 478 | read_lock(&obd_dev_lock); |
| 479 | for (index = 0; index <= max_index; index++) { |
| 480 | struct obd_device *obd = class_num2obd(index); |
| 481 | if (obd != NULL) |
| 482 | dev_count++; |
| 483 | } |
| 484 | read_unlock(&obd_dev_lock); |
| 485 | |
| 486 | return dev_count; |
| 487 | } |
| 488 | EXPORT_SYMBOL(get_devices_count); |
| 489 | |
| 490 | void class_obd_list(void) |
| 491 | { |
| 492 | char *status; |
| 493 | int i; |
| 494 | |
| 495 | read_lock(&obd_dev_lock); |
| 496 | for (i = 0; i < class_devno_max(); i++) { |
| 497 | struct obd_device *obd = class_num2obd(i); |
| 498 | |
| 499 | if (obd == NULL) |
| 500 | continue; |
| 501 | if (obd->obd_stopping) |
| 502 | status = "ST"; |
| 503 | else if (obd->obd_set_up) |
| 504 | status = "UP"; |
| 505 | else if (obd->obd_attached) |
| 506 | status = "AT"; |
| 507 | else |
| 508 | status = "--"; |
| 509 | LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n", |
| 510 | i, status, obd->obd_type->typ_name, |
| 511 | obd->obd_name, obd->obd_uuid.uuid, |
| 512 | atomic_read(&obd->obd_refcount)); |
| 513 | } |
| 514 | read_unlock(&obd_dev_lock); |
| 515 | return; |
| 516 | } |
| 517 | |
| 518 | /* Search for a client OBD connected to tgt_uuid. If grp_uuid is |
| 519 | specified, then only the client with that uuid is returned, |
| 520 | otherwise any client connected to the tgt is returned. */ |
Greg Donald | 5444261 | 2014-10-20 11:18:12 -0500 | [diff] [blame] | 521 | struct obd_device *class_find_client_obd(struct obd_uuid *tgt_uuid, |
| 522 | const char *typ_name, |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 523 | struct obd_uuid *grp_uuid) |
| 524 | { |
| 525 | int i; |
| 526 | |
| 527 | read_lock(&obd_dev_lock); |
| 528 | for (i = 0; i < class_devno_max(); i++) { |
| 529 | struct obd_device *obd = class_num2obd(i); |
| 530 | |
| 531 | if (obd == NULL) |
| 532 | continue; |
| 533 | if ((strncmp(obd->obd_type->typ_name, typ_name, |
| 534 | strlen(typ_name)) == 0)) { |
| 535 | if (obd_uuid_equals(tgt_uuid, |
| 536 | &obd->u.cli.cl_target_uuid) && |
| 537 | ((grp_uuid)? obd_uuid_equals(grp_uuid, |
| 538 | &obd->obd_uuid) : 1)) { |
| 539 | read_unlock(&obd_dev_lock); |
| 540 | return obd; |
| 541 | } |
| 542 | } |
| 543 | } |
| 544 | read_unlock(&obd_dev_lock); |
| 545 | |
| 546 | return NULL; |
| 547 | } |
| 548 | EXPORT_SYMBOL(class_find_client_obd); |
| 549 | |
| 550 | /* Iterate the obd_device list looking devices have grp_uuid. Start |
| 551 | searching at *next, and if a device is found, the next index to look |
| 552 | at is saved in *next. If next is NULL, then the first matching device |
| 553 | will always be returned. */ |
Greg Donald | 5444261 | 2014-10-20 11:18:12 -0500 | [diff] [blame] | 554 | struct obd_device *class_devices_in_group(struct obd_uuid *grp_uuid, int *next) |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 555 | { |
| 556 | int i; |
| 557 | |
| 558 | if (next == NULL) |
| 559 | i = 0; |
| 560 | else if (*next >= 0 && *next < class_devno_max()) |
| 561 | i = *next; |
| 562 | else |
| 563 | return NULL; |
| 564 | |
| 565 | read_lock(&obd_dev_lock); |
| 566 | for (; i < class_devno_max(); i++) { |
| 567 | struct obd_device *obd = class_num2obd(i); |
| 568 | |
| 569 | if (obd == NULL) |
| 570 | continue; |
| 571 | if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) { |
| 572 | if (next != NULL) |
| 573 | *next = i+1; |
| 574 | read_unlock(&obd_dev_lock); |
| 575 | return obd; |
| 576 | } |
| 577 | } |
| 578 | read_unlock(&obd_dev_lock); |
| 579 | |
| 580 | return NULL; |
| 581 | } |
| 582 | EXPORT_SYMBOL(class_devices_in_group); |
| 583 | |
| 584 | /** |
| 585 | * to notify sptlrpc log for \a fsname has changed, let every relevant OBD |
| 586 | * adjust sptlrpc settings accordingly. |
| 587 | */ |
| 588 | int class_notify_sptlrpc_conf(const char *fsname, int namelen) |
| 589 | { |
| 590 | struct obd_device *obd; |
| 591 | const char *type; |
| 592 | int i, rc = 0, rc2; |
| 593 | |
| 594 | LASSERT(namelen > 0); |
| 595 | |
| 596 | read_lock(&obd_dev_lock); |
| 597 | for (i = 0; i < class_devno_max(); i++) { |
| 598 | obd = class_num2obd(i); |
| 599 | |
| 600 | if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping) |
| 601 | continue; |
| 602 | |
| 603 | /* only notify mdc, osc, mdt, ost */ |
| 604 | type = obd->obd_type->typ_name; |
| 605 | if (strcmp(type, LUSTRE_MDC_NAME) != 0 && |
| 606 | strcmp(type, LUSTRE_OSC_NAME) != 0 && |
| 607 | strcmp(type, LUSTRE_MDT_NAME) != 0 && |
| 608 | strcmp(type, LUSTRE_OST_NAME) != 0) |
| 609 | continue; |
| 610 | |
| 611 | if (strncmp(obd->obd_name, fsname, namelen)) |
| 612 | continue; |
| 613 | |
Christoph Jaeger | f9bd9c1 | 2014-03-28 00:21:07 +0100 | [diff] [blame] | 614 | class_incref(obd, __func__, obd); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 615 | read_unlock(&obd_dev_lock); |
| 616 | rc2 = obd_set_info_async(NULL, obd->obd_self_export, |
| 617 | sizeof(KEY_SPTLRPC_CONF), |
| 618 | KEY_SPTLRPC_CONF, 0, NULL, NULL); |
| 619 | rc = rc ? rc : rc2; |
Christoph Jaeger | f9bd9c1 | 2014-03-28 00:21:07 +0100 | [diff] [blame] | 620 | class_decref(obd, __func__, obd); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 621 | read_lock(&obd_dev_lock); |
| 622 | } |
| 623 | read_unlock(&obd_dev_lock); |
| 624 | return rc; |
| 625 | } |
| 626 | EXPORT_SYMBOL(class_notify_sptlrpc_conf); |
| 627 | |
| 628 | void obd_cleanup_caches(void) |
| 629 | { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 630 | if (obd_device_cachep) { |
| 631 | kmem_cache_destroy(obd_device_cachep); |
| 632 | obd_device_cachep = NULL; |
| 633 | } |
| 634 | if (obdo_cachep) { |
| 635 | kmem_cache_destroy(obdo_cachep); |
| 636 | obdo_cachep = NULL; |
| 637 | } |
| 638 | if (import_cachep) { |
| 639 | kmem_cache_destroy(import_cachep); |
| 640 | import_cachep = NULL; |
| 641 | } |
| 642 | if (capa_cachep) { |
| 643 | kmem_cache_destroy(capa_cachep); |
| 644 | capa_cachep = NULL; |
| 645 | } |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 646 | } |
| 647 | |
| 648 | int obd_init_caches(void) |
| 649 | { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 650 | LASSERT(obd_device_cachep == NULL); |
| 651 | obd_device_cachep = kmem_cache_create("ll_obd_dev_cache", |
| 652 | sizeof(struct obd_device), |
| 653 | 0, 0, NULL); |
| 654 | if (!obd_device_cachep) |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 655 | goto out; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 656 | |
| 657 | LASSERT(obdo_cachep == NULL); |
| 658 | obdo_cachep = kmem_cache_create("ll_obdo_cache", sizeof(struct obdo), |
| 659 | 0, 0, NULL); |
| 660 | if (!obdo_cachep) |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 661 | goto out; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 662 | |
| 663 | LASSERT(import_cachep == NULL); |
| 664 | import_cachep = kmem_cache_create("ll_import_cache", |
| 665 | sizeof(struct obd_import), |
| 666 | 0, 0, NULL); |
| 667 | if (!import_cachep) |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 668 | goto out; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 669 | |
| 670 | LASSERT(capa_cachep == NULL); |
| 671 | capa_cachep = kmem_cache_create("capa_cache", |
| 672 | sizeof(struct obd_capa), 0, 0, NULL); |
| 673 | if (!capa_cachep) |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 674 | goto out; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 675 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 676 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 677 | out: |
| 678 | obd_cleanup_caches(); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 679 | return -ENOMEM; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 680 | |
| 681 | } |
| 682 | |
| 683 | /* map connection to client */ |
| 684 | struct obd_export *class_conn2export(struct lustre_handle *conn) |
| 685 | { |
| 686 | struct obd_export *export; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 687 | |
| 688 | if (!conn) { |
| 689 | CDEBUG(D_CACHE, "looking for null handle\n"); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 690 | return NULL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 691 | } |
| 692 | |
| 693 | if (conn->cookie == -1) { /* this means assign a new connection */ |
| 694 | CDEBUG(D_CACHE, "want a new connection\n"); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 695 | return NULL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 696 | } |
| 697 | |
Greg Kroah-Hartman | 55f5a82 | 2014-07-12 20:26:07 -0700 | [diff] [blame] | 698 | CDEBUG(D_INFO, "looking for export cookie %#llx\n", conn->cookie); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 699 | export = class_handle2object(conn->cookie); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 700 | return export; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 701 | } |
| 702 | EXPORT_SYMBOL(class_conn2export); |
| 703 | |
| 704 | struct obd_device *class_exp2obd(struct obd_export *exp) |
| 705 | { |
| 706 | if (exp) |
| 707 | return exp->exp_obd; |
| 708 | return NULL; |
| 709 | } |
| 710 | EXPORT_SYMBOL(class_exp2obd); |
| 711 | |
| 712 | struct obd_device *class_conn2obd(struct lustre_handle *conn) |
| 713 | { |
| 714 | struct obd_export *export; |
| 715 | export = class_conn2export(conn); |
| 716 | if (export) { |
| 717 | struct obd_device *obd = export->exp_obd; |
| 718 | class_export_put(export); |
| 719 | return obd; |
| 720 | } |
| 721 | return NULL; |
| 722 | } |
| 723 | EXPORT_SYMBOL(class_conn2obd); |
| 724 | |
| 725 | struct obd_import *class_exp2cliimp(struct obd_export *exp) |
| 726 | { |
| 727 | struct obd_device *obd = exp->exp_obd; |
| 728 | if (obd == NULL) |
| 729 | return NULL; |
| 730 | return obd->u.cli.cl_import; |
| 731 | } |
| 732 | EXPORT_SYMBOL(class_exp2cliimp); |
| 733 | |
| 734 | struct obd_import *class_conn2cliimp(struct lustre_handle *conn) |
| 735 | { |
| 736 | struct obd_device *obd = class_conn2obd(conn); |
| 737 | if (obd == NULL) |
| 738 | return NULL; |
| 739 | return obd->u.cli.cl_import; |
| 740 | } |
| 741 | EXPORT_SYMBOL(class_conn2cliimp); |
| 742 | |
| 743 | /* Export management functions */ |
| 744 | static void class_export_destroy(struct obd_export *exp) |
| 745 | { |
| 746 | struct obd_device *obd = exp->exp_obd; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 747 | |
| 748 | LASSERT_ATOMIC_ZERO(&exp->exp_refcount); |
| 749 | LASSERT(obd != NULL); |
| 750 | |
| 751 | CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp, |
| 752 | exp->exp_client_uuid.uuid, obd->obd_name); |
| 753 | |
| 754 | /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */ |
| 755 | if (exp->exp_connection) |
| 756 | ptlrpc_put_connection_superhack(exp->exp_connection); |
| 757 | |
| 758 | LASSERT(list_empty(&exp->exp_outstanding_replies)); |
| 759 | LASSERT(list_empty(&exp->exp_uncommitted_replies)); |
| 760 | LASSERT(list_empty(&exp->exp_req_replay_queue)); |
| 761 | LASSERT(list_empty(&exp->exp_hp_rpcs)); |
| 762 | obd_destroy_export(exp); |
| 763 | class_decref(obd, "export", exp); |
| 764 | |
| 765 | OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 766 | } |
| 767 | |
| 768 | static void export_handle_addref(void *export) |
| 769 | { |
| 770 | class_export_get(export); |
| 771 | } |
| 772 | |
| 773 | static struct portals_handle_ops export_handle_ops = { |
| 774 | .hop_addref = export_handle_addref, |
| 775 | .hop_free = NULL, |
| 776 | }; |
| 777 | |
| 778 | struct obd_export *class_export_get(struct obd_export *exp) |
| 779 | { |
| 780 | atomic_inc(&exp->exp_refcount); |
| 781 | CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp, |
| 782 | atomic_read(&exp->exp_refcount)); |
| 783 | return exp; |
| 784 | } |
| 785 | EXPORT_SYMBOL(class_export_get); |
| 786 | |
| 787 | void class_export_put(struct obd_export *exp) |
| 788 | { |
| 789 | LASSERT(exp != NULL); |
| 790 | LASSERT_ATOMIC_GT_LT(&exp->exp_refcount, 0, LI_POISON); |
| 791 | CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp, |
| 792 | atomic_read(&exp->exp_refcount) - 1); |
| 793 | |
| 794 | if (atomic_dec_and_test(&exp->exp_refcount)) { |
| 795 | LASSERT(!list_empty(&exp->exp_obd_chain)); |
| 796 | CDEBUG(D_IOCTL, "final put %p/%s\n", |
| 797 | exp, exp->exp_client_uuid.uuid); |
| 798 | |
| 799 | /* release nid stat refererence */ |
| 800 | lprocfs_exp_cleanup(exp); |
| 801 | |
| 802 | obd_zombie_export_add(exp); |
| 803 | } |
| 804 | } |
| 805 | EXPORT_SYMBOL(class_export_put); |
| 806 | |
| 807 | /* Creates a new export, adds it to the hash table, and returns a |
| 808 | * pointer to it. The refcount is 2: one for the hash reference, and |
| 809 | * one for the pointer returned by this function. */ |
| 810 | struct obd_export *class_new_export(struct obd_device *obd, |
| 811 | struct obd_uuid *cluuid) |
| 812 | { |
| 813 | struct obd_export *export; |
Lisa Nguyen | 6da6eab | 2013-10-21 18:16:26 -0700 | [diff] [blame] | 814 | struct cfs_hash *hash = NULL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 815 | int rc = 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 816 | |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 817 | export = kzalloc(sizeof(*export), GFP_NOFS); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 818 | if (!export) |
| 819 | return ERR_PTR(-ENOMEM); |
| 820 | |
| 821 | export->exp_conn_cnt = 0; |
| 822 | export->exp_lock_hash = NULL; |
| 823 | export->exp_flock_hash = NULL; |
| 824 | atomic_set(&export->exp_refcount, 2); |
| 825 | atomic_set(&export->exp_rpc_count, 0); |
| 826 | atomic_set(&export->exp_cb_count, 0); |
| 827 | atomic_set(&export->exp_locks_count, 0); |
| 828 | #if LUSTRE_TRACKS_LOCK_EXP_REFS |
| 829 | INIT_LIST_HEAD(&export->exp_locks_list); |
| 830 | spin_lock_init(&export->exp_locks_list_guard); |
| 831 | #endif |
| 832 | atomic_set(&export->exp_replay_count, 0); |
| 833 | export->exp_obd = obd; |
| 834 | INIT_LIST_HEAD(&export->exp_outstanding_replies); |
| 835 | spin_lock_init(&export->exp_uncommitted_replies_lock); |
| 836 | INIT_LIST_HEAD(&export->exp_uncommitted_replies); |
| 837 | INIT_LIST_HEAD(&export->exp_req_replay_queue); |
| 838 | INIT_LIST_HEAD(&export->exp_handle.h_link); |
| 839 | INIT_LIST_HEAD(&export->exp_hp_rpcs); |
| 840 | class_handle_hash(&export->exp_handle, &export_handle_ops); |
Greg Kroah-Hartman | 7264b8a | 2014-07-12 00:38:48 -0700 | [diff] [blame] | 841 | export->exp_last_request_time = get_seconds(); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 842 | spin_lock_init(&export->exp_lock); |
| 843 | spin_lock_init(&export->exp_rpc_lock); |
| 844 | INIT_HLIST_NODE(&export->exp_uuid_hash); |
| 845 | INIT_HLIST_NODE(&export->exp_nid_hash); |
| 846 | spin_lock_init(&export->exp_bl_list_lock); |
| 847 | INIT_LIST_HEAD(&export->exp_bl_list); |
| 848 | |
| 849 | export->exp_sp_peer = LUSTRE_SP_ANY; |
| 850 | export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID; |
| 851 | export->exp_client_uuid = *cluuid; |
| 852 | obd_init_export(export); |
| 853 | |
| 854 | spin_lock(&obd->obd_dev_lock); |
| 855 | /* shouldn't happen, but might race */ |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 856 | if (obd->obd_stopping) { |
| 857 | rc = -ENODEV; |
| 858 | goto exit_unlock; |
| 859 | } |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 860 | |
| 861 | hash = cfs_hash_getref(obd->obd_uuid_hash); |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 862 | if (hash == NULL) { |
| 863 | rc = -ENODEV; |
| 864 | goto exit_unlock; |
| 865 | } |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 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); |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 873 | rc = -EALREADY; |
| 874 | goto exit_err; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 875 | } |
| 876 | } |
| 877 | |
| 878 | spin_lock(&obd->obd_dev_lock); |
| 879 | if (obd->obd_stopping) { |
| 880 | cfs_hash_del(hash, cluuid, &export->exp_uuid_hash); |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 881 | rc = -ENODEV; |
| 882 | goto exit_unlock; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 883 | } |
| 884 | |
| 885 | class_incref(obd, "export", export); |
| 886 | list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports); |
| 887 | list_add_tail(&export->exp_obd_chain_timed, |
| 888 | &export->exp_obd->obd_exports_timed); |
| 889 | export->exp_obd->obd_num_exports++; |
| 890 | spin_unlock(&obd->obd_dev_lock); |
| 891 | cfs_hash_putref(hash); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 892 | return export; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 893 | |
| 894 | exit_unlock: |
| 895 | spin_unlock(&obd->obd_dev_lock); |
| 896 | exit_err: |
| 897 | if (hash) |
| 898 | cfs_hash_putref(hash); |
| 899 | class_handle_unhash(&export->exp_handle); |
| 900 | LASSERT(hlist_unhashed(&export->exp_uuid_hash)); |
| 901 | obd_destroy_export(export); |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 902 | kfree(export); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 903 | return ERR_PTR(rc); |
| 904 | } |
| 905 | EXPORT_SYMBOL(class_new_export); |
| 906 | |
| 907 | void class_unlink_export(struct obd_export *exp) |
| 908 | { |
| 909 | class_handle_unhash(&exp->exp_handle); |
| 910 | |
| 911 | spin_lock(&exp->exp_obd->obd_dev_lock); |
| 912 | /* delete an uuid-export hashitem from hashtables */ |
| 913 | if (!hlist_unhashed(&exp->exp_uuid_hash)) |
| 914 | cfs_hash_del(exp->exp_obd->obd_uuid_hash, |
| 915 | &exp->exp_client_uuid, |
| 916 | &exp->exp_uuid_hash); |
| 917 | |
| 918 | list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports); |
| 919 | list_del_init(&exp->exp_obd_chain_timed); |
| 920 | exp->exp_obd->obd_num_exports--; |
| 921 | spin_unlock(&exp->exp_obd->obd_dev_lock); |
| 922 | class_export_put(exp); |
| 923 | } |
| 924 | EXPORT_SYMBOL(class_unlink_export); |
| 925 | |
| 926 | /* Import management functions */ |
Haneen Mohammed | 052c529 | 2015-03-21 10:51:42 +0300 | [diff] [blame] | 927 | static void class_import_destroy(struct obd_import *imp) |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 928 | { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 929 | CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp, |
| 930 | imp->imp_obd->obd_name); |
| 931 | |
| 932 | LASSERT_ATOMIC_ZERO(&imp->imp_refcount); |
| 933 | |
| 934 | ptlrpc_put_connection_superhack(imp->imp_connection); |
| 935 | |
| 936 | while (!list_empty(&imp->imp_conn_list)) { |
| 937 | struct obd_import_conn *imp_conn; |
| 938 | |
| 939 | imp_conn = list_entry(imp->imp_conn_list.next, |
| 940 | struct obd_import_conn, oic_item); |
| 941 | list_del_init(&imp_conn->oic_item); |
| 942 | ptlrpc_put_connection_superhack(imp_conn->oic_conn); |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 943 | kfree(imp_conn); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 944 | } |
| 945 | |
| 946 | LASSERT(imp->imp_sec == NULL); |
| 947 | class_decref(imp->imp_obd, "import", imp); |
| 948 | OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 949 | } |
| 950 | |
| 951 | static void import_handle_addref(void *import) |
| 952 | { |
| 953 | class_import_get(import); |
| 954 | } |
| 955 | |
| 956 | static struct portals_handle_ops import_handle_ops = { |
| 957 | .hop_addref = import_handle_addref, |
| 958 | .hop_free = NULL, |
| 959 | }; |
| 960 | |
| 961 | struct obd_import *class_import_get(struct obd_import *import) |
| 962 | { |
| 963 | atomic_inc(&import->imp_refcount); |
| 964 | CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import, |
| 965 | atomic_read(&import->imp_refcount), |
| 966 | import->imp_obd->obd_name); |
| 967 | return import; |
| 968 | } |
| 969 | EXPORT_SYMBOL(class_import_get); |
| 970 | |
| 971 | void class_import_put(struct obd_import *imp) |
| 972 | { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 973 | LASSERT(list_empty(&imp->imp_zombie_chain)); |
| 974 | LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON); |
| 975 | |
| 976 | CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp, |
| 977 | atomic_read(&imp->imp_refcount) - 1, |
| 978 | imp->imp_obd->obd_name); |
| 979 | |
| 980 | if (atomic_dec_and_test(&imp->imp_refcount)) { |
| 981 | CDEBUG(D_INFO, "final put import %p\n", imp); |
| 982 | obd_zombie_import_add(imp); |
| 983 | } |
| 984 | |
| 985 | /* catch possible import put race */ |
| 986 | LASSERT_ATOMIC_GE_LT(&imp->imp_refcount, 0, LI_POISON); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 987 | } |
| 988 | EXPORT_SYMBOL(class_import_put); |
| 989 | |
| 990 | static void init_imp_at(struct imp_at *at) { |
| 991 | int i; |
| 992 | at_init(&at->iat_net_latency, 0, 0); |
| 993 | for (i = 0; i < IMP_AT_MAX_PORTALS; i++) { |
| 994 | /* max service estimates are tracked on the server side, so |
| 995 | don't use the AT history here, just use the last reported |
| 996 | val. (But keep hist for proc histogram, worst_ever) */ |
| 997 | at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT, |
| 998 | AT_FLG_NOHIST); |
| 999 | } |
| 1000 | } |
| 1001 | |
| 1002 | struct obd_import *class_new_import(struct obd_device *obd) |
| 1003 | { |
| 1004 | struct obd_import *imp; |
| 1005 | |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 1006 | imp = kzalloc(sizeof(*imp), GFP_NOFS); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1007 | if (imp == NULL) |
| 1008 | return NULL; |
| 1009 | |
| 1010 | INIT_LIST_HEAD(&imp->imp_pinger_chain); |
| 1011 | INIT_LIST_HEAD(&imp->imp_zombie_chain); |
| 1012 | INIT_LIST_HEAD(&imp->imp_replay_list); |
| 1013 | INIT_LIST_HEAD(&imp->imp_sending_list); |
| 1014 | INIT_LIST_HEAD(&imp->imp_delayed_list); |
Hongchao Zhang | 63d4257 | 2014-02-28 21:16:37 -0500 | [diff] [blame] | 1015 | INIT_LIST_HEAD(&imp->imp_committed_list); |
| 1016 | imp->imp_replay_cursor = &imp->imp_committed_list; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1017 | spin_lock_init(&imp->imp_lock); |
| 1018 | imp->imp_last_success_conn = 0; |
| 1019 | imp->imp_state = LUSTRE_IMP_NEW; |
| 1020 | imp->imp_obd = class_incref(obd, "import", imp); |
| 1021 | mutex_init(&imp->imp_sec_mutex); |
| 1022 | init_waitqueue_head(&imp->imp_recovery_waitq); |
| 1023 | |
| 1024 | atomic_set(&imp->imp_refcount, 2); |
| 1025 | atomic_set(&imp->imp_unregistering, 0); |
| 1026 | atomic_set(&imp->imp_inflight, 0); |
| 1027 | atomic_set(&imp->imp_replay_inflight, 0); |
| 1028 | atomic_set(&imp->imp_inval_count, 0); |
| 1029 | INIT_LIST_HEAD(&imp->imp_conn_list); |
| 1030 | INIT_LIST_HEAD(&imp->imp_handle.h_link); |
| 1031 | class_handle_hash(&imp->imp_handle, &import_handle_ops); |
| 1032 | init_imp_at(&imp->imp_at); |
| 1033 | |
| 1034 | /* the default magic is V2, will be used in connect RPC, and |
| 1035 | * then adjusted according to the flags in request/reply. */ |
| 1036 | imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2; |
| 1037 | |
| 1038 | return imp; |
| 1039 | } |
| 1040 | EXPORT_SYMBOL(class_new_import); |
| 1041 | |
| 1042 | void class_destroy_import(struct obd_import *import) |
| 1043 | { |
| 1044 | LASSERT(import != NULL); |
| 1045 | LASSERT(import != LP_POISON); |
| 1046 | |
| 1047 | class_handle_unhash(&import->imp_handle); |
| 1048 | |
| 1049 | spin_lock(&import->imp_lock); |
| 1050 | import->imp_generation++; |
| 1051 | spin_unlock(&import->imp_lock); |
| 1052 | class_import_put(import); |
| 1053 | } |
| 1054 | EXPORT_SYMBOL(class_destroy_import); |
| 1055 | |
| 1056 | #if LUSTRE_TRACKS_LOCK_EXP_REFS |
| 1057 | |
| 1058 | void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock) |
| 1059 | { |
| 1060 | spin_lock(&exp->exp_locks_list_guard); |
| 1061 | |
| 1062 | LASSERT(lock->l_exp_refs_nr >= 0); |
| 1063 | |
| 1064 | if (lock->l_exp_refs_target != NULL && |
| 1065 | lock->l_exp_refs_target != exp) { |
| 1066 | LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n", |
| 1067 | exp, lock, lock->l_exp_refs_target); |
| 1068 | } |
| 1069 | if ((lock->l_exp_refs_nr ++) == 0) { |
| 1070 | list_add(&lock->l_exp_refs_link, &exp->exp_locks_list); |
| 1071 | lock->l_exp_refs_target = exp; |
| 1072 | } |
| 1073 | CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n", |
| 1074 | lock, exp, lock->l_exp_refs_nr); |
| 1075 | spin_unlock(&exp->exp_locks_list_guard); |
| 1076 | } |
| 1077 | EXPORT_SYMBOL(__class_export_add_lock_ref); |
| 1078 | |
| 1079 | void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock) |
| 1080 | { |
| 1081 | spin_lock(&exp->exp_locks_list_guard); |
| 1082 | LASSERT(lock->l_exp_refs_nr > 0); |
| 1083 | if (lock->l_exp_refs_target != exp) { |
Joe Perches | 2d00bd1 | 2014-11-23 11:28:50 -0800 | [diff] [blame] | 1084 | LCONSOLE_WARN("lock %p, mismatching export pointers: %p, %p\n", |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1085 | lock, lock->l_exp_refs_target, exp); |
| 1086 | } |
| 1087 | if (-- lock->l_exp_refs_nr == 0) { |
| 1088 | list_del_init(&lock->l_exp_refs_link); |
| 1089 | lock->l_exp_refs_target = NULL; |
| 1090 | } |
| 1091 | CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n", |
| 1092 | lock, exp, lock->l_exp_refs_nr); |
| 1093 | spin_unlock(&exp->exp_locks_list_guard); |
| 1094 | } |
| 1095 | EXPORT_SYMBOL(__class_export_del_lock_ref); |
| 1096 | #endif |
| 1097 | |
| 1098 | /* A connection defines an export context in which preallocation can |
| 1099 | be managed. This releases the export pointer reference, and returns |
| 1100 | the export handle, so the export refcount is 1 when this function |
| 1101 | returns. */ |
| 1102 | int class_connect(struct lustre_handle *conn, struct obd_device *obd, |
| 1103 | struct obd_uuid *cluuid) |
| 1104 | { |
| 1105 | struct obd_export *export; |
| 1106 | LASSERT(conn != NULL); |
| 1107 | LASSERT(obd != NULL); |
| 1108 | LASSERT(cluuid != NULL); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1109 | |
| 1110 | export = class_new_export(obd, cluuid); |
| 1111 | if (IS_ERR(export)) |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1112 | return PTR_ERR(export); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1113 | |
| 1114 | conn->cookie = export->exp_handle.h_cookie; |
| 1115 | class_export_put(export); |
| 1116 | |
Greg Kroah-Hartman | 55f5a82 | 2014-07-12 20:26:07 -0700 | [diff] [blame] | 1117 | CDEBUG(D_IOCTL, "connect: client %s, cookie %#llx\n", |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1118 | cluuid->uuid, conn->cookie); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1119 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1120 | } |
| 1121 | EXPORT_SYMBOL(class_connect); |
| 1122 | |
| 1123 | /* if export is involved in recovery then clean up related things */ |
Haneen Mohammed | 052c529 | 2015-03-21 10:51:42 +0300 | [diff] [blame] | 1124 | static void class_export_recovery_cleanup(struct obd_export *exp) |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1125 | { |
| 1126 | struct obd_device *obd = exp->exp_obd; |
| 1127 | |
| 1128 | spin_lock(&obd->obd_recovery_task_lock); |
| 1129 | if (exp->exp_delayed) |
| 1130 | obd->obd_delayed_clients--; |
| 1131 | if (obd->obd_recovering) { |
| 1132 | if (exp->exp_in_recovery) { |
| 1133 | spin_lock(&exp->exp_lock); |
| 1134 | exp->exp_in_recovery = 0; |
| 1135 | spin_unlock(&exp->exp_lock); |
| 1136 | LASSERT_ATOMIC_POS(&obd->obd_connected_clients); |
| 1137 | atomic_dec(&obd->obd_connected_clients); |
| 1138 | } |
| 1139 | |
| 1140 | /* if called during recovery then should update |
| 1141 | * obd_stale_clients counter, |
| 1142 | * lightweight exports are not counted */ |
| 1143 | if (exp->exp_failed && |
| 1144 | (exp_connect_flags(exp) & OBD_CONNECT_LIGHTWEIGHT) == 0) |
| 1145 | exp->exp_obd->obd_stale_clients++; |
| 1146 | } |
| 1147 | spin_unlock(&obd->obd_recovery_task_lock); |
Hongchao Zhang | 62e4941 | 2015-02-01 21:52:04 -0500 | [diff] [blame] | 1148 | |
| 1149 | spin_lock(&exp->exp_lock); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1150 | /** Cleanup req replay fields */ |
| 1151 | if (exp->exp_req_replay_needed) { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1152 | exp->exp_req_replay_needed = 0; |
Hongchao Zhang | 62e4941 | 2015-02-01 21:52:04 -0500 | [diff] [blame] | 1153 | |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1154 | LASSERT(atomic_read(&obd->obd_req_replay_clients)); |
| 1155 | atomic_dec(&obd->obd_req_replay_clients); |
| 1156 | } |
Hongchao Zhang | 62e4941 | 2015-02-01 21:52:04 -0500 | [diff] [blame] | 1157 | |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1158 | /** Cleanup lock replay data */ |
| 1159 | if (exp->exp_lock_replay_needed) { |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1160 | exp->exp_lock_replay_needed = 0; |
Hongchao Zhang | 62e4941 | 2015-02-01 21:52:04 -0500 | [diff] [blame] | 1161 | |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1162 | LASSERT(atomic_read(&obd->obd_lock_replay_clients)); |
| 1163 | atomic_dec(&obd->obd_lock_replay_clients); |
| 1164 | } |
Hongchao Zhang | 62e4941 | 2015-02-01 21:52:04 -0500 | [diff] [blame] | 1165 | spin_unlock(&exp->exp_lock); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1166 | } |
| 1167 | |
| 1168 | /* This function removes 1-3 references from the export: |
| 1169 | * 1 - for export pointer passed |
| 1170 | * and if disconnect really need |
| 1171 | * 2 - removing from hash |
| 1172 | * 3 - in client_unlink_export |
| 1173 | * The export pointer passed to this function can destroyed */ |
| 1174 | int class_disconnect(struct obd_export *export) |
| 1175 | { |
| 1176 | int already_disconnected; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1177 | |
| 1178 | if (export == NULL) { |
| 1179 | CWARN("attempting to free NULL export %p\n", export); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1180 | return -EINVAL; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1181 | } |
| 1182 | |
| 1183 | spin_lock(&export->exp_lock); |
| 1184 | already_disconnected = export->exp_disconnected; |
| 1185 | export->exp_disconnected = 1; |
| 1186 | spin_unlock(&export->exp_lock); |
| 1187 | |
| 1188 | /* class_cleanup(), abort_recovery(), and class_fail_export() |
| 1189 | * all end up in here, and if any of them race we shouldn't |
| 1190 | * call extra class_export_puts(). */ |
| 1191 | if (already_disconnected) { |
| 1192 | LASSERT(hlist_unhashed(&export->exp_nid_hash)); |
Julia Lawall | d212afd | 2014-09-07 18:18:35 +0200 | [diff] [blame] | 1193 | goto no_disconn; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1194 | } |
| 1195 | |
Greg Kroah-Hartman | 55f5a82 | 2014-07-12 20:26:07 -0700 | [diff] [blame] | 1196 | CDEBUG(D_IOCTL, "disconnect: cookie %#llx\n", |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1197 | export->exp_handle.h_cookie); |
| 1198 | |
| 1199 | if (!hlist_unhashed(&export->exp_nid_hash)) |
| 1200 | cfs_hash_del(export->exp_obd->obd_nid_hash, |
| 1201 | &export->exp_connection->c_peer.nid, |
| 1202 | &export->exp_nid_hash); |
| 1203 | |
| 1204 | class_export_recovery_cleanup(export); |
| 1205 | class_unlink_export(export); |
| 1206 | no_disconn: |
| 1207 | class_export_put(export); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1208 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1209 | } |
| 1210 | EXPORT_SYMBOL(class_disconnect); |
| 1211 | |
| 1212 | /* Return non-zero for a fully connected export */ |
| 1213 | int class_connected_export(struct obd_export *exp) |
| 1214 | { |
| 1215 | if (exp) { |
| 1216 | int connected; |
| 1217 | spin_lock(&exp->exp_lock); |
Haneen Mohammed | b6ee382 | 2015-03-13 20:48:53 +0300 | [diff] [blame] | 1218 | connected = exp->exp_conn_cnt > 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1219 | spin_unlock(&exp->exp_lock); |
| 1220 | return connected; |
| 1221 | } |
| 1222 | return 0; |
| 1223 | } |
| 1224 | EXPORT_SYMBOL(class_connected_export); |
| 1225 | |
| 1226 | static void class_disconnect_export_list(struct list_head *list, |
| 1227 | enum obd_option flags) |
| 1228 | { |
| 1229 | int rc; |
| 1230 | struct obd_export *exp; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1231 | |
| 1232 | /* It's possible that an export may disconnect itself, but |
| 1233 | * nothing else will be added to this list. */ |
| 1234 | while (!list_empty(list)) { |
| 1235 | exp = list_entry(list->next, struct obd_export, |
| 1236 | exp_obd_chain); |
| 1237 | /* need for safe call CDEBUG after obd_disconnect */ |
| 1238 | class_export_get(exp); |
| 1239 | |
| 1240 | spin_lock(&exp->exp_lock); |
| 1241 | exp->exp_flags = flags; |
| 1242 | spin_unlock(&exp->exp_lock); |
| 1243 | |
| 1244 | if (obd_uuid_equals(&exp->exp_client_uuid, |
| 1245 | &exp->exp_obd->obd_uuid)) { |
| 1246 | CDEBUG(D_HA, |
| 1247 | "exp %p export uuid == obd uuid, don't discon\n", |
| 1248 | exp); |
| 1249 | /* Need to delete this now so we don't end up pointing |
| 1250 | * to work_list later when this export is cleaned up. */ |
| 1251 | list_del_init(&exp->exp_obd_chain); |
| 1252 | class_export_put(exp); |
| 1253 | continue; |
| 1254 | } |
| 1255 | |
| 1256 | class_export_get(exp); |
Joe Perches | 2d00bd1 | 2014-11-23 11:28:50 -0800 | [diff] [blame] | 1257 | CDEBUG(D_HA, "%s: disconnecting export at %s (%p), last request at " CFS_TIME_T "\n", |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1258 | exp->exp_obd->obd_name, obd_export_nid2str(exp), |
| 1259 | exp, exp->exp_last_request_time); |
| 1260 | /* release one export reference anyway */ |
| 1261 | rc = obd_disconnect(exp); |
| 1262 | |
| 1263 | CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n", |
| 1264 | obd_export_nid2str(exp), exp, rc); |
| 1265 | class_export_put(exp); |
| 1266 | } |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1267 | } |
| 1268 | |
| 1269 | void class_disconnect_exports(struct obd_device *obd) |
| 1270 | { |
| 1271 | struct list_head work_list; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1272 | |
| 1273 | /* Move all of the exports from obd_exports to a work list, en masse. */ |
| 1274 | INIT_LIST_HEAD(&work_list); |
| 1275 | spin_lock(&obd->obd_dev_lock); |
| 1276 | list_splice_init(&obd->obd_exports, &work_list); |
| 1277 | list_splice_init(&obd->obd_delayed_exports, &work_list); |
| 1278 | spin_unlock(&obd->obd_dev_lock); |
| 1279 | |
| 1280 | if (!list_empty(&work_list)) { |
Joe Perches | 2d00bd1 | 2014-11-23 11:28:50 -0800 | [diff] [blame] | 1281 | CDEBUG(D_HA, "OBD device %d (%p) has exports, disconnecting them\n", |
| 1282 | obd->obd_minor, obd); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1283 | class_disconnect_export_list(&work_list, |
| 1284 | exp_flags_from_obd(obd)); |
| 1285 | } else |
| 1286 | CDEBUG(D_HA, "OBD device %d (%p) has no exports\n", |
| 1287 | obd->obd_minor, obd); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1288 | } |
| 1289 | EXPORT_SYMBOL(class_disconnect_exports); |
| 1290 | |
| 1291 | /* Remove exports that have not completed recovery. |
| 1292 | */ |
| 1293 | void class_disconnect_stale_exports(struct obd_device *obd, |
| 1294 | int (*test_export)(struct obd_export *)) |
| 1295 | { |
| 1296 | struct list_head work_list; |
| 1297 | struct obd_export *exp, *n; |
| 1298 | int evicted = 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1299 | |
| 1300 | INIT_LIST_HEAD(&work_list); |
| 1301 | spin_lock(&obd->obd_dev_lock); |
| 1302 | list_for_each_entry_safe(exp, n, &obd->obd_exports, |
| 1303 | exp_obd_chain) { |
| 1304 | /* don't count self-export as client */ |
| 1305 | if (obd_uuid_equals(&exp->exp_client_uuid, |
| 1306 | &exp->exp_obd->obd_uuid)) |
| 1307 | continue; |
| 1308 | |
| 1309 | /* don't evict clients which have no slot in last_rcvd |
| 1310 | * (e.g. lightweight connection) */ |
| 1311 | if (exp->exp_target_data.ted_lr_idx == -1) |
| 1312 | continue; |
| 1313 | |
| 1314 | spin_lock(&exp->exp_lock); |
| 1315 | if (exp->exp_failed || test_export(exp)) { |
| 1316 | spin_unlock(&exp->exp_lock); |
| 1317 | continue; |
| 1318 | } |
| 1319 | exp->exp_failed = 1; |
| 1320 | spin_unlock(&exp->exp_lock); |
| 1321 | |
| 1322 | list_move(&exp->exp_obd_chain, &work_list); |
| 1323 | evicted++; |
| 1324 | CDEBUG(D_HA, "%s: disconnect stale client %s@%s\n", |
| 1325 | obd->obd_name, exp->exp_client_uuid.uuid, |
| 1326 | exp->exp_connection == NULL ? "<unknown>" : |
| 1327 | libcfs_nid2str(exp->exp_connection->c_peer.nid)); |
| 1328 | print_export_data(exp, "EVICTING", 0); |
| 1329 | } |
| 1330 | spin_unlock(&obd->obd_dev_lock); |
| 1331 | |
| 1332 | if (evicted) |
| 1333 | LCONSOLE_WARN("%s: disconnecting %d stale clients\n", |
| 1334 | obd->obd_name, evicted); |
| 1335 | |
| 1336 | class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) | |
| 1337 | OBD_OPT_ABORT_RECOV); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1338 | } |
| 1339 | EXPORT_SYMBOL(class_disconnect_stale_exports); |
| 1340 | |
| 1341 | void class_fail_export(struct obd_export *exp) |
| 1342 | { |
| 1343 | int rc, already_failed; |
| 1344 | |
| 1345 | spin_lock(&exp->exp_lock); |
| 1346 | already_failed = exp->exp_failed; |
| 1347 | exp->exp_failed = 1; |
| 1348 | spin_unlock(&exp->exp_lock); |
| 1349 | |
| 1350 | if (already_failed) { |
| 1351 | CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n", |
| 1352 | exp, exp->exp_client_uuid.uuid); |
| 1353 | return; |
| 1354 | } |
| 1355 | |
| 1356 | CDEBUG(D_HA, "disconnecting export %p/%s\n", |
| 1357 | exp, exp->exp_client_uuid.uuid); |
| 1358 | |
| 1359 | if (obd_dump_on_timeout) |
| 1360 | libcfs_debug_dumplog(); |
| 1361 | |
| 1362 | /* need for safe call CDEBUG after obd_disconnect */ |
| 1363 | class_export_get(exp); |
| 1364 | |
| 1365 | /* Most callers into obd_disconnect are removing their own reference |
| 1366 | * (request, for example) in addition to the one from the hash table. |
| 1367 | * We don't have such a reference here, so make one. */ |
| 1368 | class_export_get(exp); |
| 1369 | rc = obd_disconnect(exp); |
| 1370 | if (rc) |
| 1371 | CERROR("disconnecting export %p failed: %d\n", exp, rc); |
| 1372 | else |
| 1373 | CDEBUG(D_HA, "disconnected export %p/%s\n", |
| 1374 | exp, exp->exp_client_uuid.uuid); |
| 1375 | class_export_put(exp); |
| 1376 | } |
| 1377 | EXPORT_SYMBOL(class_fail_export); |
| 1378 | |
| 1379 | char *obd_export_nid2str(struct obd_export *exp) |
| 1380 | { |
| 1381 | if (exp->exp_connection != NULL) |
| 1382 | return libcfs_nid2str(exp->exp_connection->c_peer.nid); |
| 1383 | |
| 1384 | return "(no nid)"; |
| 1385 | } |
| 1386 | EXPORT_SYMBOL(obd_export_nid2str); |
| 1387 | |
| 1388 | int obd_export_evict_by_nid(struct obd_device *obd, const char *nid) |
| 1389 | { |
Lisa Nguyen | 6da6eab | 2013-10-21 18:16:26 -0700 | [diff] [blame] | 1390 | struct cfs_hash *nid_hash; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1391 | struct obd_export *doomed_exp = NULL; |
| 1392 | int exports_evicted = 0; |
| 1393 | |
| 1394 | lnet_nid_t nid_key = libcfs_str2nid((char *)nid); |
| 1395 | |
| 1396 | spin_lock(&obd->obd_dev_lock); |
| 1397 | /* umount has run already, so evict thread should leave |
| 1398 | * its task to umount thread now */ |
| 1399 | if (obd->obd_stopping) { |
| 1400 | spin_unlock(&obd->obd_dev_lock); |
| 1401 | return exports_evicted; |
| 1402 | } |
| 1403 | nid_hash = obd->obd_nid_hash; |
| 1404 | cfs_hash_getref(nid_hash); |
| 1405 | spin_unlock(&obd->obd_dev_lock); |
| 1406 | |
| 1407 | do { |
| 1408 | doomed_exp = cfs_hash_lookup(nid_hash, &nid_key); |
| 1409 | if (doomed_exp == NULL) |
| 1410 | break; |
| 1411 | |
| 1412 | LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key, |
| 1413 | "nid %s found, wanted nid %s, requested nid %s\n", |
| 1414 | obd_export_nid2str(doomed_exp), |
| 1415 | libcfs_nid2str(nid_key), nid); |
| 1416 | LASSERTF(doomed_exp != obd->obd_self_export, |
| 1417 | "self-export is hashed by NID?\n"); |
| 1418 | exports_evicted++; |
Joe Perches | 2d00bd1 | 2014-11-23 11:28:50 -0800 | [diff] [blame] | 1419 | LCONSOLE_WARN("%s: evicting %s (at %s) by administrative request\n", |
| 1420 | obd->obd_name, |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1421 | obd_uuid2str(&doomed_exp->exp_client_uuid), |
| 1422 | obd_export_nid2str(doomed_exp)); |
| 1423 | class_fail_export(doomed_exp); |
| 1424 | class_export_put(doomed_exp); |
| 1425 | } while (1); |
| 1426 | |
| 1427 | cfs_hash_putref(nid_hash); |
| 1428 | |
| 1429 | if (!exports_evicted) |
Greg Donald | 1d8cb70 | 2014-08-25 20:07:19 -0500 | [diff] [blame] | 1430 | CDEBUG(D_HA, |
| 1431 | "%s: can't disconnect NID '%s': no exports found\n", |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1432 | obd->obd_name, nid); |
| 1433 | return exports_evicted; |
| 1434 | } |
| 1435 | EXPORT_SYMBOL(obd_export_evict_by_nid); |
| 1436 | |
| 1437 | int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid) |
| 1438 | { |
Lisa Nguyen | 6da6eab | 2013-10-21 18:16:26 -0700 | [diff] [blame] | 1439 | struct cfs_hash *uuid_hash; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1440 | struct obd_export *doomed_exp = NULL; |
| 1441 | struct obd_uuid doomed_uuid; |
| 1442 | int exports_evicted = 0; |
| 1443 | |
| 1444 | spin_lock(&obd->obd_dev_lock); |
| 1445 | if (obd->obd_stopping) { |
| 1446 | spin_unlock(&obd->obd_dev_lock); |
| 1447 | return exports_evicted; |
| 1448 | } |
| 1449 | uuid_hash = obd->obd_uuid_hash; |
| 1450 | cfs_hash_getref(uuid_hash); |
| 1451 | spin_unlock(&obd->obd_dev_lock); |
| 1452 | |
| 1453 | obd_str2uuid(&doomed_uuid, uuid); |
| 1454 | if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) { |
| 1455 | CERROR("%s: can't evict myself\n", obd->obd_name); |
| 1456 | cfs_hash_putref(uuid_hash); |
| 1457 | return exports_evicted; |
| 1458 | } |
| 1459 | |
| 1460 | doomed_exp = cfs_hash_lookup(uuid_hash, &doomed_uuid); |
| 1461 | |
| 1462 | if (doomed_exp == NULL) { |
| 1463 | CERROR("%s: can't disconnect %s: no exports found\n", |
| 1464 | obd->obd_name, uuid); |
| 1465 | } else { |
Masanari Iida | c4f39553 | 2013-07-21 03:38:08 +0900 | [diff] [blame] | 1466 | CWARN("%s: evicting %s at administrative request\n", |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1467 | obd->obd_name, doomed_exp->exp_client_uuid.uuid); |
| 1468 | class_fail_export(doomed_exp); |
| 1469 | class_export_put(doomed_exp); |
| 1470 | exports_evicted++; |
| 1471 | } |
| 1472 | cfs_hash_putref(uuid_hash); |
| 1473 | |
| 1474 | return exports_evicted; |
| 1475 | } |
| 1476 | EXPORT_SYMBOL(obd_export_evict_by_uuid); |
| 1477 | |
| 1478 | #if LUSTRE_TRACKS_LOCK_EXP_REFS |
| 1479 | void (*class_export_dump_hook)(struct obd_export*) = NULL; |
| 1480 | EXPORT_SYMBOL(class_export_dump_hook); |
| 1481 | #endif |
| 1482 | |
| 1483 | static void print_export_data(struct obd_export *exp, const char *status, |
| 1484 | int locks) |
| 1485 | { |
| 1486 | struct ptlrpc_reply_state *rs; |
| 1487 | struct ptlrpc_reply_state *first_reply = NULL; |
| 1488 | int nreplies = 0; |
| 1489 | |
| 1490 | spin_lock(&exp->exp_lock); |
| 1491 | list_for_each_entry(rs, &exp->exp_outstanding_replies, |
| 1492 | rs_exp_list) { |
| 1493 | if (nreplies == 0) |
| 1494 | first_reply = rs; |
| 1495 | nreplies++; |
| 1496 | } |
| 1497 | spin_unlock(&exp->exp_lock); |
| 1498 | |
Greg Kroah-Hartman | b0f5aad | 2014-07-12 20:06:04 -0700 | [diff] [blame] | 1499 | CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s %llu\n", |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1500 | exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid, |
| 1501 | obd_export_nid2str(exp), atomic_read(&exp->exp_refcount), |
| 1502 | atomic_read(&exp->exp_rpc_count), |
| 1503 | atomic_read(&exp->exp_cb_count), |
| 1504 | atomic_read(&exp->exp_locks_count), |
| 1505 | exp->exp_disconnected, exp->exp_delayed, exp->exp_failed, |
| 1506 | nreplies, first_reply, nreplies > 3 ? "..." : "", |
| 1507 | exp->exp_last_committed); |
| 1508 | #if LUSTRE_TRACKS_LOCK_EXP_REFS |
| 1509 | if (locks && class_export_dump_hook != NULL) |
| 1510 | class_export_dump_hook(exp); |
| 1511 | #endif |
| 1512 | } |
| 1513 | |
| 1514 | void dump_exports(struct obd_device *obd, int locks) |
| 1515 | { |
| 1516 | struct obd_export *exp; |
| 1517 | |
| 1518 | spin_lock(&obd->obd_dev_lock); |
| 1519 | list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) |
| 1520 | print_export_data(exp, "ACTIVE", locks); |
| 1521 | list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain) |
| 1522 | print_export_data(exp, "UNLINKED", locks); |
| 1523 | list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain) |
| 1524 | print_export_data(exp, "DELAYED", locks); |
| 1525 | spin_unlock(&obd->obd_dev_lock); |
| 1526 | spin_lock(&obd_zombie_impexp_lock); |
| 1527 | list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain) |
| 1528 | print_export_data(exp, "ZOMBIE", locks); |
| 1529 | spin_unlock(&obd_zombie_impexp_lock); |
| 1530 | } |
| 1531 | EXPORT_SYMBOL(dump_exports); |
| 1532 | |
| 1533 | void obd_exports_barrier(struct obd_device *obd) |
| 1534 | { |
| 1535 | int waited = 2; |
| 1536 | LASSERT(list_empty(&obd->obd_exports)); |
| 1537 | spin_lock(&obd->obd_dev_lock); |
| 1538 | while (!list_empty(&obd->obd_unlinked_exports)) { |
| 1539 | spin_unlock(&obd->obd_dev_lock); |
Peng Tao | 18fd5ba | 2014-03-18 21:05:55 +0800 | [diff] [blame] | 1540 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 1541 | schedule_timeout(cfs_time_seconds(waited)); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1542 | if (waited > 5 && IS_PO2(waited)) { |
Joe Perches | 2d00bd1 | 2014-11-23 11:28:50 -0800 | [diff] [blame] | 1543 | LCONSOLE_WARN("%s is waiting for obd_unlinked_exports more than %d seconds. The obd refcount = %d. Is it stuck?\n", |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1544 | obd->obd_name, waited, |
| 1545 | atomic_read(&obd->obd_refcount)); |
| 1546 | dump_exports(obd, 1); |
| 1547 | } |
| 1548 | waited *= 2; |
| 1549 | spin_lock(&obd->obd_dev_lock); |
| 1550 | } |
| 1551 | spin_unlock(&obd->obd_dev_lock); |
| 1552 | } |
| 1553 | EXPORT_SYMBOL(obd_exports_barrier); |
| 1554 | |
| 1555 | /* Total amount of zombies to be destroyed */ |
Supriya Karanth | 225f597 | 2015-03-03 23:48:21 +0900 | [diff] [blame] | 1556 | static int zombies_count; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1557 | |
| 1558 | /** |
| 1559 | * kill zombie imports and exports |
| 1560 | */ |
| 1561 | void obd_zombie_impexp_cull(void) |
| 1562 | { |
| 1563 | struct obd_import *import; |
| 1564 | struct obd_export *export; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1565 | |
| 1566 | do { |
| 1567 | spin_lock(&obd_zombie_impexp_lock); |
| 1568 | |
| 1569 | import = NULL; |
| 1570 | if (!list_empty(&obd_zombie_imports)) { |
| 1571 | import = list_entry(obd_zombie_imports.next, |
| 1572 | struct obd_import, |
| 1573 | imp_zombie_chain); |
| 1574 | list_del_init(&import->imp_zombie_chain); |
| 1575 | } |
| 1576 | |
| 1577 | export = NULL; |
| 1578 | if (!list_empty(&obd_zombie_exports)) { |
| 1579 | export = list_entry(obd_zombie_exports.next, |
| 1580 | struct obd_export, |
| 1581 | exp_obd_chain); |
| 1582 | list_del_init(&export->exp_obd_chain); |
| 1583 | } |
| 1584 | |
| 1585 | spin_unlock(&obd_zombie_impexp_lock); |
| 1586 | |
| 1587 | if (import != NULL) { |
| 1588 | class_import_destroy(import); |
| 1589 | spin_lock(&obd_zombie_impexp_lock); |
| 1590 | zombies_count--; |
| 1591 | spin_unlock(&obd_zombie_impexp_lock); |
| 1592 | } |
| 1593 | |
| 1594 | if (export != NULL) { |
| 1595 | class_export_destroy(export); |
| 1596 | spin_lock(&obd_zombie_impexp_lock); |
| 1597 | zombies_count--; |
| 1598 | spin_unlock(&obd_zombie_impexp_lock); |
| 1599 | } |
| 1600 | |
| 1601 | cond_resched(); |
| 1602 | } while (import != NULL || export != NULL); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1603 | } |
| 1604 | |
| 1605 | static struct completion obd_zombie_start; |
| 1606 | static struct completion obd_zombie_stop; |
| 1607 | static unsigned long obd_zombie_flags; |
| 1608 | static wait_queue_head_t obd_zombie_waitq; |
| 1609 | static pid_t obd_zombie_pid; |
| 1610 | |
| 1611 | enum { |
| 1612 | OBD_ZOMBIE_STOP = 0x0001, |
| 1613 | }; |
| 1614 | |
| 1615 | /** |
| 1616 | * check for work for kill zombie import/export thread. |
| 1617 | */ |
| 1618 | static int obd_zombie_impexp_check(void *arg) |
| 1619 | { |
| 1620 | int rc; |
| 1621 | |
| 1622 | spin_lock(&obd_zombie_impexp_lock); |
| 1623 | rc = (zombies_count == 0) && |
| 1624 | !test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags); |
| 1625 | spin_unlock(&obd_zombie_impexp_lock); |
| 1626 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1627 | return rc; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1628 | } |
| 1629 | |
| 1630 | /** |
Masanari Iida | 52cf6ac | 2014-02-15 01:11:17 +0900 | [diff] [blame] | 1631 | * Add export to the obd_zombie thread and notify it. |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1632 | */ |
| 1633 | static void obd_zombie_export_add(struct obd_export *exp) { |
| 1634 | spin_lock(&exp->exp_obd->obd_dev_lock); |
| 1635 | LASSERT(!list_empty(&exp->exp_obd_chain)); |
| 1636 | list_del_init(&exp->exp_obd_chain); |
| 1637 | spin_unlock(&exp->exp_obd->obd_dev_lock); |
| 1638 | spin_lock(&obd_zombie_impexp_lock); |
| 1639 | zombies_count++; |
| 1640 | list_add(&exp->exp_obd_chain, &obd_zombie_exports); |
| 1641 | spin_unlock(&obd_zombie_impexp_lock); |
| 1642 | |
| 1643 | obd_zombie_impexp_notify(); |
| 1644 | } |
| 1645 | |
| 1646 | /** |
Masanari Iida | 52cf6ac | 2014-02-15 01:11:17 +0900 | [diff] [blame] | 1647 | * Add import to the obd_zombie thread and notify it. |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1648 | */ |
| 1649 | static void obd_zombie_import_add(struct obd_import *imp) { |
| 1650 | LASSERT(imp->imp_sec == NULL); |
| 1651 | LASSERT(imp->imp_rq_pool == NULL); |
| 1652 | spin_lock(&obd_zombie_impexp_lock); |
| 1653 | LASSERT(list_empty(&imp->imp_zombie_chain)); |
| 1654 | zombies_count++; |
| 1655 | list_add(&imp->imp_zombie_chain, &obd_zombie_imports); |
| 1656 | spin_unlock(&obd_zombie_impexp_lock); |
| 1657 | |
| 1658 | obd_zombie_impexp_notify(); |
| 1659 | } |
| 1660 | |
| 1661 | /** |
| 1662 | * notify import/export destroy thread about new zombie. |
| 1663 | */ |
| 1664 | static void obd_zombie_impexp_notify(void) |
| 1665 | { |
| 1666 | /* |
Masanari Iida | 52cf6ac | 2014-02-15 01:11:17 +0900 | [diff] [blame] | 1667 | * Make sure obd_zombie_impexp_thread get this notification. |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1668 | * It is possible this signal only get by obd_zombie_barrier, and |
| 1669 | * barrier gulps this notification and sleeps away and hangs ensues |
| 1670 | */ |
| 1671 | wake_up_all(&obd_zombie_waitq); |
| 1672 | } |
| 1673 | |
| 1674 | /** |
| 1675 | * check whether obd_zombie is idle |
| 1676 | */ |
| 1677 | static int obd_zombie_is_idle(void) |
| 1678 | { |
| 1679 | int rc; |
| 1680 | |
| 1681 | LASSERT(!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)); |
| 1682 | spin_lock(&obd_zombie_impexp_lock); |
| 1683 | rc = (zombies_count == 0); |
| 1684 | spin_unlock(&obd_zombie_impexp_lock); |
| 1685 | return rc; |
| 1686 | } |
| 1687 | |
| 1688 | /** |
| 1689 | * wait when obd_zombie import/export queues become empty |
| 1690 | */ |
| 1691 | void obd_zombie_barrier(void) |
| 1692 | { |
| 1693 | struct l_wait_info lwi = { 0 }; |
| 1694 | |
| 1695 | if (obd_zombie_pid == current_pid()) |
| 1696 | /* don't wait for myself */ |
| 1697 | return; |
| 1698 | l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi); |
| 1699 | } |
| 1700 | EXPORT_SYMBOL(obd_zombie_barrier); |
| 1701 | |
| 1702 | |
| 1703 | /** |
| 1704 | * destroy zombie export/import thread. |
| 1705 | */ |
| 1706 | static int obd_zombie_impexp_thread(void *unused) |
| 1707 | { |
| 1708 | unshare_fs_struct(); |
| 1709 | complete(&obd_zombie_start); |
| 1710 | |
| 1711 | obd_zombie_pid = current_pid(); |
| 1712 | |
| 1713 | while (!test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) { |
| 1714 | struct l_wait_info lwi = { 0 }; |
| 1715 | |
| 1716 | l_wait_event(obd_zombie_waitq, |
| 1717 | !obd_zombie_impexp_check(NULL), &lwi); |
| 1718 | obd_zombie_impexp_cull(); |
| 1719 | |
| 1720 | /* |
| 1721 | * Notify obd_zombie_barrier callers that queues |
| 1722 | * may be empty. |
| 1723 | */ |
| 1724 | wake_up(&obd_zombie_waitq); |
| 1725 | } |
| 1726 | |
| 1727 | complete(&obd_zombie_stop); |
| 1728 | |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1729 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1730 | } |
| 1731 | |
| 1732 | |
| 1733 | /** |
| 1734 | * start destroy zombie import/export thread |
| 1735 | */ |
| 1736 | int obd_zombie_impexp_init(void) |
| 1737 | { |
Greg Kroah-Hartman | 68b636b | 2013-08-04 08:56:42 +0800 | [diff] [blame] | 1738 | struct task_struct *task; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1739 | |
| 1740 | INIT_LIST_HEAD(&obd_zombie_imports); |
| 1741 | INIT_LIST_HEAD(&obd_zombie_exports); |
| 1742 | spin_lock_init(&obd_zombie_impexp_lock); |
| 1743 | init_completion(&obd_zombie_start); |
| 1744 | init_completion(&obd_zombie_stop); |
| 1745 | init_waitqueue_head(&obd_zombie_waitq); |
| 1746 | obd_zombie_pid = 0; |
| 1747 | |
| 1748 | task = kthread_run(obd_zombie_impexp_thread, NULL, "obd_zombid"); |
| 1749 | if (IS_ERR(task)) |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1750 | return PTR_ERR(task); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1751 | |
| 1752 | wait_for_completion(&obd_zombie_start); |
Greg Kroah-Hartman | 0a3bdb0 | 2013-08-03 10:35:28 +0800 | [diff] [blame] | 1753 | return 0; |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1754 | } |
| 1755 | /** |
| 1756 | * stop destroy zombie import/export thread |
| 1757 | */ |
| 1758 | void obd_zombie_impexp_stop(void) |
| 1759 | { |
| 1760 | set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags); |
| 1761 | obd_zombie_impexp_notify(); |
| 1762 | wait_for_completion(&obd_zombie_stop); |
| 1763 | } |
| 1764 | |
| 1765 | /***** Kernel-userspace comm helpers *******/ |
| 1766 | |
| 1767 | /* Get length of entire message, including header */ |
| 1768 | int kuc_len(int payload_len) |
| 1769 | { |
| 1770 | return sizeof(struct kuc_hdr) + payload_len; |
| 1771 | } |
| 1772 | EXPORT_SYMBOL(kuc_len); |
| 1773 | |
| 1774 | /* Get a pointer to kuc header, given a ptr to the payload |
| 1775 | * @param p Pointer to payload area |
| 1776 | * @returns Pointer to kuc header |
| 1777 | */ |
Greg Donald | 5444261 | 2014-10-20 11:18:12 -0500 | [diff] [blame] | 1778 | struct kuc_hdr *kuc_ptr(void *p) |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1779 | { |
| 1780 | struct kuc_hdr *lh = ((struct kuc_hdr *)p) - 1; |
| 1781 | LASSERT(lh->kuc_magic == KUC_MAGIC); |
| 1782 | return lh; |
| 1783 | } |
| 1784 | EXPORT_SYMBOL(kuc_ptr); |
| 1785 | |
| 1786 | /* Test if payload is part of kuc message |
| 1787 | * @param p Pointer to payload area |
| 1788 | * @returns boolean |
| 1789 | */ |
| 1790 | int kuc_ispayload(void *p) |
| 1791 | { |
| 1792 | struct kuc_hdr *kh = ((struct kuc_hdr *)p) - 1; |
| 1793 | |
| 1794 | if (kh->kuc_magic == KUC_MAGIC) |
| 1795 | return 1; |
| 1796 | else |
| 1797 | return 0; |
| 1798 | } |
| 1799 | EXPORT_SYMBOL(kuc_ispayload); |
| 1800 | |
| 1801 | /* Alloc space for a message, and fill in header |
| 1802 | * @return Pointer to payload area |
| 1803 | */ |
| 1804 | void *kuc_alloc(int payload_len, int transport, int type) |
| 1805 | { |
| 1806 | struct kuc_hdr *lh; |
| 1807 | int len = kuc_len(payload_len); |
| 1808 | |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 1809 | lh = kzalloc(len, GFP_NOFS); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1810 | if (lh == NULL) |
| 1811 | return ERR_PTR(-ENOMEM); |
| 1812 | |
| 1813 | lh->kuc_magic = KUC_MAGIC; |
| 1814 | lh->kuc_transport = transport; |
| 1815 | lh->kuc_msgtype = type; |
| 1816 | lh->kuc_msglen = len; |
| 1817 | |
| 1818 | return (void *)(lh + 1); |
| 1819 | } |
| 1820 | EXPORT_SYMBOL(kuc_alloc); |
| 1821 | |
| 1822 | /* Takes pointer to payload area */ |
| 1823 | inline void kuc_free(void *p, int payload_len) |
| 1824 | { |
| 1825 | struct kuc_hdr *lh = kuc_ptr(p); |
Julia Lawall | d727904 | 2015-05-01 17:51:15 +0200 | [diff] [blame] | 1826 | kfree(lh); |
Peng Tao | d7e09d0 | 2013-05-02 16:46:55 +0800 | [diff] [blame] | 1827 | } |
| 1828 | EXPORT_SYMBOL(kuc_free); |