/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*- * vim:expandtab:shiftwidth=8:tabstop=8: * * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 only, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License version 2 for more details (a copy is included * in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * * GPL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved * Use is subject to license terms. */ /* * This file is part of Lustre, http://www.lustre.org/ * Lustre is a trademark of Sun Microsystems, Inc. * * lustre/obdclass/genops.c * * These are the only exported functions, they provide some generic * infrastructure for managing object devices */ #define DEBUG_SUBSYSTEM S_CLASS #ifndef __KERNEL__ #include #endif #include #include #include extern cfs_list_t obd_types; cfs_spinlock_t obd_types_lock; cfs_mem_cache_t *obd_device_cachep; cfs_mem_cache_t *obdo_cachep; EXPORT_SYMBOL(obdo_cachep); cfs_mem_cache_t *import_cachep; cfs_list_t obd_zombie_imports; cfs_list_t obd_zombie_exports; cfs_spinlock_t obd_zombie_impexp_lock; static void obd_zombie_impexp_notify(void); static void obd_zombie_export_add(struct obd_export *exp); static void obd_zombie_import_add(struct obd_import *imp); static void print_export_data(struct obd_export *exp, const char *status, int locks); int (*ptlrpc_put_connection_superhack)(struct ptlrpc_connection *c); /* * support functions: we could use inter-module communication, but this * is more portable to other OS's */ static struct obd_device *obd_device_alloc(void) { struct obd_device *obd; OBD_SLAB_ALLOC_PTR_GFP(obd, obd_device_cachep, CFS_ALLOC_IO); if (obd != NULL) { obd->obd_magic = OBD_DEVICE_MAGIC; } return obd; } EXPORT_SYMBOL(obd_device_alloc); static void obd_device_free(struct obd_device *obd) { LASSERT(obd != NULL); LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "obd %p obd_magic %08x != %08x\n", obd, obd->obd_magic, OBD_DEVICE_MAGIC); if (obd->obd_namespace != NULL) { CERROR("obd %p: namespace %p was not properly cleaned up (obd_force=%d)!\n", obd, obd->obd_namespace, obd->obd_force); LBUG(); } lu_ref_fini(&obd->obd_reference); OBD_SLAB_FREE_PTR(obd, obd_device_cachep); } struct obd_type *class_search_type(const char *name) { cfs_list_t *tmp; struct obd_type *type; cfs_spin_lock(&obd_types_lock); cfs_list_for_each(tmp, &obd_types) { type = cfs_list_entry(tmp, struct obd_type, typ_chain); if (strcmp(type->typ_name, name) == 0) { cfs_spin_unlock(&obd_types_lock); return type; } } cfs_spin_unlock(&obd_types_lock); return NULL; } struct obd_type *class_get_type(const char *name) { struct obd_type *type = class_search_type(name); #ifdef CONFIG_KMOD if (!type) { const char *modname = name; if (!cfs_request_module("%s", modname)) { CDEBUG(D_INFO, "Loaded module '%s'\n", modname); type = class_search_type(name); } else { LCONSOLE_ERROR_MSG(0x158, "Can't load module '%s'\n", modname); } } #endif if (type) { cfs_spin_lock(&type->obd_type_lock); type->typ_refcnt++; cfs_try_module_get(type->typ_dt_ops->o_owner); cfs_spin_unlock(&type->obd_type_lock); } return type; } void class_put_type(struct obd_type *type) { LASSERT(type); cfs_spin_lock(&type->obd_type_lock); type->typ_refcnt--; cfs_module_put(type->typ_dt_ops->o_owner); cfs_spin_unlock(&type->obd_type_lock); } #define CLASS_MAX_NAME 1024 int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, struct lprocfs_vars *vars, const char *name, struct lu_device_type *ldt) { struct obd_type *type; int rc = 0; ENTRY; /* sanity check */ LASSERT(strnlen(name, CLASS_MAX_NAME) < CLASS_MAX_NAME); if (class_search_type(name)) { CDEBUG(D_IOCTL, "Type %s already registered\n", name); RETURN(-EEXIST); } rc = -ENOMEM; OBD_ALLOC(type, sizeof(*type)); if (type == NULL) RETURN(rc); OBD_ALLOC_PTR(type->typ_dt_ops); OBD_ALLOC_PTR(type->typ_md_ops); OBD_ALLOC(type->typ_name, strlen(name) + 1); if (type->typ_dt_ops == NULL || type->typ_md_ops == NULL || type->typ_name == NULL) GOTO (failed, rc); *(type->typ_dt_ops) = *dt_ops; /* md_ops is optional */ if (md_ops) *(type->typ_md_ops) = *md_ops; strcpy(type->typ_name, name); cfs_spin_lock_init(&type->obd_type_lock); #ifdef LPROCFS type->typ_procroot = lprocfs_register(type->typ_name, proc_lustre_root, vars, type); if (IS_ERR(type->typ_procroot)) { rc = PTR_ERR(type->typ_procroot); type->typ_procroot = NULL; GOTO (failed, rc); } #endif if (ldt != NULL) { type->typ_lu = ldt; rc = lu_device_type_init(ldt); if (rc != 0) GOTO (failed, rc); } cfs_spin_lock(&obd_types_lock); cfs_list_add(&type->typ_chain, &obd_types); cfs_spin_unlock(&obd_types_lock); RETURN (0); failed: if (type->typ_name != NULL) OBD_FREE(type->typ_name, strlen(name) + 1); if (type->typ_md_ops != NULL) OBD_FREE_PTR(type->typ_md_ops); if (type->typ_dt_ops != NULL) OBD_FREE_PTR(type->typ_dt_ops); OBD_FREE(type, sizeof(*type)); RETURN(rc); } int class_unregister_type(const char *name) { struct obd_type *type = class_search_type(name); ENTRY; if (!type) { CERROR("unknown obd type\n"); RETURN(-EINVAL); } if (type->typ_refcnt) { CERROR("type %s has refcount (%d)\n", name, type->typ_refcnt); /* This is a bad situation, let's make the best of it */ /* Remove ops, but leave the name for debugging */ OBD_FREE_PTR(type->typ_dt_ops); OBD_FREE_PTR(type->typ_md_ops); RETURN(-EBUSY); } if (type->typ_procroot) { lprocfs_remove(&type->typ_procroot); } if (type->typ_lu) lu_device_type_fini(type->typ_lu); cfs_spin_lock(&obd_types_lock); cfs_list_del(&type->typ_chain); cfs_spin_unlock(&obd_types_lock); OBD_FREE(type->typ_name, strlen(name) + 1); if (type->typ_dt_ops != NULL) OBD_FREE_PTR(type->typ_dt_ops); if (type->typ_md_ops != NULL) OBD_FREE_PTR(type->typ_md_ops); OBD_FREE(type, sizeof(*type)); RETURN(0); } /* class_unregister_type */ /** * Create a new obd device. * * Find an empty slot in ::obd_devs[], create a new obd device in it. * * \param[in] type_name obd device type string. * \param[in] name obd device name. * * \retval NULL if create fails, otherwise return the obd device * pointer created. */ struct obd_device *class_newdev(const char *type_name, const char *name) { struct obd_device *result = NULL; struct obd_device *newdev; struct obd_type *type = NULL; int i; int new_obd_minor = 0; if (strlen(name) >= MAX_OBD_NAME) { CERROR("name/uuid must be < %u bytes long\n", MAX_OBD_NAME); RETURN(ERR_PTR(-EINVAL)); } type = class_get_type(type_name); if (type == NULL){ CERROR("OBD: unknown type: %s\n", type_name); RETURN(ERR_PTR(-ENODEV)); } newdev = obd_device_alloc(); if (newdev == NULL) { class_put_type(type); RETURN(ERR_PTR(-ENOMEM)); } LASSERT(newdev->obd_magic == OBD_DEVICE_MAGIC); cfs_spin_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); if (obd && obd->obd_name && (strcmp(name, obd->obd_name) == 0)) { CERROR("Device %s already exists, won't add\n", name); if (result) { LASSERTF(result->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n", result, result->obd_magic, OBD_DEVICE_MAGIC); LASSERTF(result->obd_minor == new_obd_minor, "%p obd_minor %d != %d\n", result, result->obd_minor, new_obd_minor); obd_devs[result->obd_minor] = NULL; result->obd_name[0]='\0'; } result = ERR_PTR(-EEXIST); break; } if (!result && !obd) { result = newdev; result->obd_minor = i; new_obd_minor = i; result->obd_type = type; strncpy(result->obd_name, name, sizeof(result->obd_name) - 1); obd_devs[i] = result; } } cfs_spin_unlock(&obd_dev_lock); if (result == NULL && i >= class_devno_max()) { CERROR("all %u OBD devices used, increase MAX_OBD_DEVICES\n", class_devno_max()); result = ERR_PTR(-EOVERFLOW); } if (IS_ERR(result)) { obd_device_free(newdev); class_put_type(type); } else { CDEBUG(D_IOCTL, "Adding new device %s (%p)\n", result->obd_name, result); } return result; } void class_release_dev(struct obd_device *obd) { struct obd_type *obd_type = obd->obd_type; LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n", obd, obd->obd_magic, OBD_DEVICE_MAGIC); LASSERTF(obd == obd_devs[obd->obd_minor], "obd %p != obd_devs[%d] %p\n", obd, obd->obd_minor, obd_devs[obd->obd_minor]); LASSERT(obd_type != NULL); CDEBUG(D_INFO, "Release obd device %s obd_type name =%s\n", obd->obd_name,obd->obd_type->typ_name); cfs_spin_lock(&obd_dev_lock); obd_devs[obd->obd_minor] = NULL; cfs_spin_unlock(&obd_dev_lock); obd_device_free(obd); class_put_type(obd_type); } int class_name2dev(const char *name) { int i; if (!name) return -1; cfs_spin_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); if (obd && obd->obd_name && strcmp(name, obd->obd_name) == 0) { /* Make sure we finished attaching before we give out any references */ LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC); if (obd->obd_attached) { cfs_spin_unlock(&obd_dev_lock); return i; } break; } } cfs_spin_unlock(&obd_dev_lock); return -1; } struct obd_device *class_name2obd(const char *name) { int dev = class_name2dev(name); if (dev < 0 || dev > class_devno_max()) return NULL; return class_num2obd(dev); } int class_uuid2dev(struct obd_uuid *uuid) { int i; cfs_spin_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); if (obd && obd_uuid_equals(uuid, &obd->obd_uuid)) { LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC); cfs_spin_unlock(&obd_dev_lock); return i; } } cfs_spin_unlock(&obd_dev_lock); return -1; } struct obd_device *class_uuid2obd(struct obd_uuid *uuid) { int dev = class_uuid2dev(uuid); if (dev < 0) return NULL; return class_num2obd(dev); } /** * Get obd device from ::obd_devs[] * * \param num [in] array index * * \retval NULL if ::obd_devs[\a num] does not contains an obd device * otherwise return the obd device there. */ struct obd_device *class_num2obd(int num) { struct obd_device *obd = NULL; if (num < class_devno_max()) { obd = obd_devs[num]; if (obd == NULL) return NULL; LASSERTF(obd->obd_magic == OBD_DEVICE_MAGIC, "%p obd_magic %08x != %08x\n", obd, obd->obd_magic, OBD_DEVICE_MAGIC); LASSERTF(obd->obd_minor == num, "%p obd_minor %0d != %0d\n", obd, obd->obd_minor, num); } return obd; } void class_obd_list(void) { char *status; int i; cfs_spin_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); if (obd == NULL) continue; if (obd->obd_stopping) status = "ST"; else if (obd->obd_set_up) status = "UP"; else if (obd->obd_attached) status = "AT"; else status = "--"; LCONSOLE(D_CONFIG, "%3d %s %s %s %s %d\n", i, status, obd->obd_type->typ_name, obd->obd_name, obd->obd_uuid.uuid, cfs_atomic_read(&obd->obd_refcount)); } cfs_spin_unlock(&obd_dev_lock); return; } /* Search for a client OBD connected to tgt_uuid. If grp_uuid is specified, then only the client with that uuid is returned, otherwise any client connected to the tgt is returned. */ struct obd_device * class_find_client_obd(struct obd_uuid *tgt_uuid, const char * typ_name, struct obd_uuid *grp_uuid) { int i; cfs_spin_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); if (obd == NULL) continue; if ((strncmp(obd->obd_type->typ_name, typ_name, strlen(typ_name)) == 0)) { if (obd_uuid_equals(tgt_uuid, &obd->u.cli.cl_target_uuid) && ((grp_uuid)? obd_uuid_equals(grp_uuid, &obd->obd_uuid) : 1)) { cfs_spin_unlock(&obd_dev_lock); return obd; } } } cfs_spin_unlock(&obd_dev_lock); return NULL; } /* Iterate the obd_device list looking devices have grp_uuid. Start searching at *next, and if a device is found, the next index to look at is saved in *next. If next is NULL, then the first matching device will always be returned. */ struct obd_device * class_devices_in_group(struct obd_uuid *grp_uuid, int *next) { int i; if (next == NULL) i = 0; else if (*next >= 0 && *next < class_devno_max()) i = *next; else return NULL; cfs_spin_lock(&obd_dev_lock); for (; i < class_devno_max(); i++) { struct obd_device *obd = class_num2obd(i); if (obd == NULL) continue; if (obd_uuid_equals(grp_uuid, &obd->obd_uuid)) { if (next != NULL) *next = i+1; cfs_spin_unlock(&obd_dev_lock); return obd; } } cfs_spin_unlock(&obd_dev_lock); return NULL; } /** * to notify sptlrpc log for \a fsname has changed, let every relevant OBD * adjust sptlrpc settings accordingly. */ int class_notify_sptlrpc_conf(const char *fsname, int namelen) { struct obd_device *obd; const char *type; int i, rc = 0, rc2; LASSERT(namelen > 0); cfs_spin_lock(&obd_dev_lock); for (i = 0; i < class_devno_max(); i++) { obd = class_num2obd(i); if (obd == NULL || obd->obd_set_up == 0 || obd->obd_stopping) continue; /* only notify mdc, osc, mdt, ost */ type = obd->obd_type->typ_name; if (strcmp(type, LUSTRE_MDC_NAME) != 0 && strcmp(type, LUSTRE_OSC_NAME) != 0 && strcmp(type, LUSTRE_MDT_NAME) != 0 && strcmp(type, LUSTRE_OST_NAME) != 0) continue; if (strncmp(obd->obd_name, fsname, namelen)) continue; class_incref(obd, __FUNCTION__, obd); cfs_spin_unlock(&obd_dev_lock); rc2 = obd_set_info_async(obd->obd_self_export, sizeof(KEY_SPTLRPC_CONF), KEY_SPTLRPC_CONF, 0, NULL, NULL); rc = rc ? rc : rc2; class_decref(obd, __FUNCTION__, obd); cfs_spin_lock(&obd_dev_lock); } cfs_spin_unlock(&obd_dev_lock); return rc; } EXPORT_SYMBOL(class_notify_sptlrpc_conf); void obd_cleanup_caches(void) { int rc; ENTRY; if (obd_device_cachep) { rc = cfs_mem_cache_destroy(obd_device_cachep); LASSERTF(rc == 0, "Cannot destropy ll_obd_device_cache: rc %d\n", rc); obd_device_cachep = NULL; } if (obdo_cachep) { rc = cfs_mem_cache_destroy(obdo_cachep); LASSERTF(rc == 0, "Cannot destory ll_obdo_cache\n"); obdo_cachep = NULL; } if (import_cachep) { rc = cfs_mem_cache_destroy(import_cachep); LASSERTF(rc == 0, "Cannot destory ll_import_cache\n"); import_cachep = NULL; } if (capa_cachep) { rc = cfs_mem_cache_destroy(capa_cachep); LASSERTF(rc == 0, "Cannot destory capa_cache\n"); capa_cachep = NULL; } EXIT; } int obd_init_caches(void) { ENTRY; LASSERT(obd_device_cachep == NULL); obd_device_cachep = cfs_mem_cache_create("ll_obd_dev_cache", sizeof(struct obd_device), 0, 0); if (!obd_device_cachep) GOTO(out, -ENOMEM); LASSERT(obdo_cachep == NULL); obdo_cachep = cfs_mem_cache_create("ll_obdo_cache", sizeof(struct obdo), 0, 0); if (!obdo_cachep) GOTO(out, -ENOMEM); LASSERT(import_cachep == NULL); import_cachep = cfs_mem_cache_create("ll_import_cache", sizeof(struct obd_import), 0, 0); if (!import_cachep) GOTO(out, -ENOMEM); LASSERT(capa_cachep == NULL); capa_cachep = cfs_mem_cache_create("capa_cache", sizeof(struct obd_capa), 0, 0); if (!capa_cachep) GOTO(out, -ENOMEM); RETURN(0); out: obd_cleanup_caches(); RETURN(-ENOMEM); } /* map connection to client */ struct obd_export *class_conn2export(struct lustre_handle *conn) { struct obd_export *export; ENTRY; if (!conn) { CDEBUG(D_CACHE, "looking for null handle\n"); RETURN(NULL); } if (conn->cookie == -1) { /* this means assign a new connection */ CDEBUG(D_CACHE, "want a new connection\n"); RETURN(NULL); } CDEBUG(D_INFO, "looking for export cookie "LPX64"\n", conn->cookie); export = class_handle2object(conn->cookie); RETURN(export); } struct obd_device *class_exp2obd(struct obd_export *exp) { if (exp) return exp->exp_obd; return NULL; } struct obd_device *class_conn2obd(struct lustre_handle *conn) { struct obd_export *export; export = class_conn2export(conn); if (export) { struct obd_device *obd = export->exp_obd; class_export_put(export); return obd; } return NULL; } struct obd_import *class_exp2cliimp(struct obd_export *exp) { struct obd_device *obd = exp->exp_obd; if (obd == NULL) return NULL; return obd->u.cli.cl_import; } struct obd_import *class_conn2cliimp(struct lustre_handle *conn) { struct obd_device *obd = class_conn2obd(conn); if (obd == NULL) return NULL; return obd->u.cli.cl_import; } /* Export management functions */ static void class_export_destroy(struct obd_export *exp) { struct obd_device *obd = exp->exp_obd; ENTRY; LASSERT (cfs_atomic_read(&exp->exp_refcount) == 0); CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp, exp->exp_client_uuid.uuid, obd->obd_name); LASSERT(obd != NULL); /* "Local" exports (lctl, LOV->{mdc,osc}) have no connection. */ if (exp->exp_connection) ptlrpc_put_connection_superhack(exp->exp_connection); LASSERT(cfs_list_empty(&exp->exp_outstanding_replies)); LASSERT(cfs_list_empty(&exp->exp_uncommitted_replies)); LASSERT(cfs_list_empty(&exp->exp_req_replay_queue)); LASSERT(cfs_list_empty(&exp->exp_queued_rpc)); obd_destroy_export(exp); class_decref(obd, "export", exp); OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle); EXIT; } static void export_handle_addref(void *export) { class_export_get(export); } struct obd_export *class_export_get(struct obd_export *exp) { cfs_atomic_inc(&exp->exp_refcount); CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp, cfs_atomic_read(&exp->exp_refcount)); return exp; } EXPORT_SYMBOL(class_export_get); void class_export_put(struct obd_export *exp) { LASSERT(exp != NULL); CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp, cfs_atomic_read(&exp->exp_refcount) - 1); LASSERT(cfs_atomic_read(&exp->exp_refcount) > 0); LASSERT(cfs_atomic_read(&exp->exp_refcount) < 0x5a5a5a); if (cfs_atomic_dec_and_test(&exp->exp_refcount)) { LASSERT(!cfs_list_empty(&exp->exp_obd_chain)); CDEBUG(D_IOCTL, "final put %p/%s\n", exp, exp->exp_client_uuid.uuid); obd_zombie_export_add(exp); } } EXPORT_SYMBOL(class_export_put); /* Creates a new export, adds it to the hash table, and returns a * pointer to it. The refcount is 2: one for the hash reference, and * one for the pointer returned by this function. */ struct obd_export *class_new_export(struct obd_device *obd, struct obd_uuid *cluuid) { struct obd_export *export; int rc = 0; ENTRY; OBD_ALLOC_PTR(export); if (!export) return ERR_PTR(-ENOMEM); export->exp_conn_cnt = 0; export->exp_lock_hash = NULL; cfs_atomic_set(&export->exp_refcount, 2); cfs_atomic_set(&export->exp_rpc_count, 0); cfs_atomic_set(&export->exp_cb_count, 0); cfs_atomic_set(&export->exp_locks_count, 0); #if LUSTRE_TRACKS_LOCK_EXP_REFS CFS_INIT_LIST_HEAD(&export->exp_locks_list); cfs_spin_lock_init(&export->exp_locks_list_guard); #endif cfs_atomic_set(&export->exp_replay_count, 0); export->exp_obd = obd; CFS_INIT_LIST_HEAD(&export->exp_outstanding_replies); cfs_spin_lock_init(&export->exp_uncommitted_replies_lock); CFS_INIT_LIST_HEAD(&export->exp_uncommitted_replies); CFS_INIT_LIST_HEAD(&export->exp_req_replay_queue); CFS_INIT_LIST_HEAD(&export->exp_handle.h_link); CFS_INIT_LIST_HEAD(&export->exp_queued_rpc); class_handle_hash(&export->exp_handle, export_handle_addref); export->exp_last_request_time = cfs_time_current_sec(); cfs_spin_lock_init(&export->exp_lock); CFS_INIT_HLIST_NODE(&export->exp_uuid_hash); CFS_INIT_HLIST_NODE(&export->exp_nid_hash); export->exp_sp_peer = LUSTRE_SP_ANY; export->exp_flvr.sf_rpc = SPTLRPC_FLVR_INVALID; export->exp_client_uuid = *cluuid; obd_init_export(export); cfs_spin_lock(&obd->obd_dev_lock); /* shouldn't happen, but might race */ if (obd->obd_stopping) GOTO(exit_err, rc = -ENODEV); if (!obd_uuid_equals(cluuid, &obd->obd_uuid)) { rc = cfs_hash_add_unique(obd->obd_uuid_hash, cluuid, &export->exp_uuid_hash); if (rc != 0) { LCONSOLE_WARN("%s: denying duplicate export for %s, %d\n", obd->obd_name, cluuid->uuid, rc); GOTO(exit_err, rc = -EALREADY); } } class_incref(obd, "export", export); cfs_list_add(&export->exp_obd_chain, &export->exp_obd->obd_exports); cfs_list_add_tail(&export->exp_obd_chain_timed, &export->exp_obd->obd_exports_timed); export->exp_obd->obd_num_exports++; cfs_spin_unlock(&obd->obd_dev_lock); RETURN(export); exit_err: cfs_spin_unlock(&obd->obd_dev_lock); class_handle_unhash(&export->exp_handle); LASSERT(cfs_hlist_unhashed(&export->exp_uuid_hash)); obd_destroy_export(export); OBD_FREE_PTR(export); return ERR_PTR(rc); } EXPORT_SYMBOL(class_new_export); void class_unlink_export(struct obd_export *exp) { class_handle_unhash(&exp->exp_handle); cfs_spin_lock(&exp->exp_obd->obd_dev_lock); /* delete an uuid-export hashitem from hashtables */ if (!cfs_hlist_unhashed(&exp->exp_uuid_hash)) cfs_hash_del(exp->exp_obd->obd_uuid_hash, &exp->exp_client_uuid, &exp->exp_uuid_hash); cfs_list_move(&exp->exp_obd_chain, &exp->exp_obd->obd_unlinked_exports); cfs_list_del_init(&exp->exp_obd_chain_timed); exp->exp_obd->obd_num_exports--; cfs_spin_unlock(&exp->exp_obd->obd_dev_lock); class_export_put(exp); } EXPORT_SYMBOL(class_unlink_export); /* Import management functions */ void class_import_destroy(struct obd_import *imp) { ENTRY; CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp, imp->imp_obd->obd_name); LASSERT(cfs_atomic_read(&imp->imp_refcount) == 0); ptlrpc_put_connection_superhack(imp->imp_connection); while (!cfs_list_empty(&imp->imp_conn_list)) { struct obd_import_conn *imp_conn; imp_conn = cfs_list_entry(imp->imp_conn_list.next, struct obd_import_conn, oic_item); cfs_list_del_init(&imp_conn->oic_item); ptlrpc_put_connection_superhack(imp_conn->oic_conn); OBD_FREE(imp_conn, sizeof(*imp_conn)); } LASSERT(imp->imp_sec == NULL); class_decref(imp->imp_obd, "import", imp); OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle); EXIT; } static void import_handle_addref(void *import) { class_import_get(import); } struct obd_import *class_import_get(struct obd_import *import) { LASSERT(cfs_atomic_read(&import->imp_refcount) >= 0); LASSERT(cfs_atomic_read(&import->imp_refcount) < 0x5a5a5a); cfs_atomic_inc(&import->imp_refcount); CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import, cfs_atomic_read(&import->imp_refcount), import->imp_obd->obd_name); return import; } EXPORT_SYMBOL(class_import_get); void class_import_put(struct obd_import *imp) { ENTRY; LASSERT(cfs_atomic_read(&imp->imp_refcount) > 0); LASSERT(cfs_atomic_read(&imp->imp_refcount) < 0x5a5a5a); LASSERT(cfs_list_empty(&imp->imp_zombie_chain)); CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp, cfs_atomic_read(&imp->imp_refcount) - 1, imp->imp_obd->obd_name); if (cfs_atomic_dec_and_test(&imp->imp_refcount)) { CDEBUG(D_INFO, "final put import %p\n", imp); obd_zombie_import_add(imp); } EXIT; } EXPORT_SYMBOL(class_import_put); static void init_imp_at(struct imp_at *at) { int i; at_init(&at->iat_net_latency, 0, 0); for (i = 0; i < IMP_AT_MAX_PORTALS; i++) { /* max service estimates are tracked on the server side, so don't use the AT history here, just use the last reported val. (But keep hist for proc histogram, worst_ever) */ at_init(&at->iat_service_estimate[i], INITIAL_CONNECT_TIMEOUT, AT_FLG_NOHIST); } } struct obd_import *class_new_import(struct obd_device *obd) { struct obd_import *imp; OBD_ALLOC(imp, sizeof(*imp)); if (imp == NULL) return NULL; CFS_INIT_LIST_HEAD(&imp->imp_zombie_chain); CFS_INIT_LIST_HEAD(&imp->imp_replay_list); CFS_INIT_LIST_HEAD(&imp->imp_sending_list); CFS_INIT_LIST_HEAD(&imp->imp_delayed_list); cfs_spin_lock_init(&imp->imp_lock); imp->imp_last_success_conn = 0; imp->imp_state = LUSTRE_IMP_NEW; imp->imp_obd = class_incref(obd, "import", imp); cfs_sema_init(&imp->imp_sec_mutex, 1); cfs_waitq_init(&imp->imp_recovery_waitq); cfs_atomic_set(&imp->imp_refcount, 2); cfs_atomic_set(&imp->imp_unregistering, 0); cfs_atomic_set(&imp->imp_inflight, 0); cfs_atomic_set(&imp->imp_replay_inflight, 0); cfs_atomic_set(&imp->imp_inval_count, 0); CFS_INIT_LIST_HEAD(&imp->imp_conn_list); CFS_INIT_LIST_HEAD(&imp->imp_handle.h_link); class_handle_hash(&imp->imp_handle, import_handle_addref); init_imp_at(&imp->imp_at); /* the default magic is V2, will be used in connect RPC, and * then adjusted according to the flags in request/reply. */ imp->imp_msg_magic = LUSTRE_MSG_MAGIC_V2; return imp; } EXPORT_SYMBOL(class_new_import); void class_destroy_import(struct obd_import *import) { LASSERT(import != NULL); LASSERT(import != LP_POISON); class_handle_unhash(&import->imp_handle); cfs_spin_lock(&import->imp_lock); import->imp_generation++; cfs_spin_unlock(&import->imp_lock); class_import_put(import); } EXPORT_SYMBOL(class_destroy_import); #if LUSTRE_TRACKS_LOCK_EXP_REFS void __class_export_add_lock_ref(struct obd_export *exp, struct ldlm_lock *lock) { cfs_spin_lock(&exp->exp_locks_list_guard); LASSERT(lock->l_exp_refs_nr >= 0); if (lock->l_exp_refs_target != NULL && lock->l_exp_refs_target != exp) { LCONSOLE_WARN("setting export %p for lock %p which already has export %p\n", exp, lock, lock->l_exp_refs_target); } if ((lock->l_exp_refs_nr ++) == 0) { cfs_list_add(&lock->l_exp_refs_link, &exp->exp_locks_list); lock->l_exp_refs_target = exp; } CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n", lock, exp, lock->l_exp_refs_nr); cfs_spin_unlock(&exp->exp_locks_list_guard); } EXPORT_SYMBOL(__class_export_add_lock_ref); void __class_export_del_lock_ref(struct obd_export *exp, struct ldlm_lock *lock) { cfs_spin_lock(&exp->exp_locks_list_guard); LASSERT(lock->l_exp_refs_nr > 0); if (lock->l_exp_refs_target != exp) { LCONSOLE_WARN("lock %p, " "mismatching export pointers: %p, %p\n", lock, lock->l_exp_refs_target, exp); } if (-- lock->l_exp_refs_nr == 0) { cfs_list_del_init(&lock->l_exp_refs_link); lock->l_exp_refs_target = NULL; } CDEBUG(D_INFO, "lock = %p, export = %p, refs = %u\n", lock, exp, lock->l_exp_refs_nr); cfs_spin_unlock(&exp->exp_locks_list_guard); } EXPORT_SYMBOL(__class_export_del_lock_ref); #endif /* A connection defines an export context in which preallocation can be managed. This releases the export pointer reference, and returns the export handle, so the export refcount is 1 when this function returns. */ int class_connect(struct lustre_handle *conn, struct obd_device *obd, struct obd_uuid *cluuid) { struct obd_export *export; LASSERT(conn != NULL); LASSERT(obd != NULL); LASSERT(cluuid != NULL); ENTRY; export = class_new_export(obd, cluuid); if (IS_ERR(export)) RETURN(PTR_ERR(export)); conn->cookie = export->exp_handle.h_cookie; class_export_put(export); CDEBUG(D_IOCTL, "connect: client %s, cookie "LPX64"\n", cluuid->uuid, conn->cookie); RETURN(0); } EXPORT_SYMBOL(class_connect); /* if export is involved in recovery then clean up related things */ void class_export_recovery_cleanup(struct obd_export *exp) { struct obd_device *obd = exp->exp_obd; cfs_spin_lock_bh(&obd->obd_processing_task_lock); if (exp->exp_delayed) obd->obd_delayed_clients--; if (obd->obd_recovering && exp->exp_in_recovery) { cfs_spin_lock(&exp->exp_lock); exp->exp_in_recovery = 0; cfs_spin_unlock(&exp->exp_lock); LASSERT(obd->obd_connected_clients); obd->obd_connected_clients--; } /** Cleanup req replay fields */ if (exp->exp_req_replay_needed) { cfs_spin_lock(&exp->exp_lock); exp->exp_req_replay_needed = 0; cfs_spin_unlock(&exp->exp_lock); LASSERT(cfs_atomic_read(&obd->obd_req_replay_clients)); cfs_atomic_dec(&obd->obd_req_replay_clients); } /** Cleanup lock replay data */ if (exp->exp_lock_replay_needed) { cfs_spin_lock(&exp->exp_lock); exp->exp_lock_replay_needed = 0; cfs_spin_unlock(&exp->exp_lock); LASSERT(cfs_atomic_read(&obd->obd_lock_replay_clients)); cfs_atomic_dec(&obd->obd_lock_replay_clients); } cfs_spin_unlock_bh(&obd->obd_processing_task_lock); } /* This function removes 1-3 references from the export: * 1 - for export pointer passed * and if disconnect really need * 2 - removing from hash * 3 - in client_unlink_export * The export pointer passed to this function can destroyed */ int class_disconnect(struct obd_export *export) { int already_disconnected; ENTRY; if (export == NULL) { fixme(); CDEBUG(D_IOCTL, "attempting to free NULL export %p\n", export); RETURN(-EINVAL); } cfs_spin_lock(&export->exp_lock); already_disconnected = export->exp_disconnected; export->exp_disconnected = 1; cfs_spin_unlock(&export->exp_lock); /* class_cleanup(), abort_recovery(), and class_fail_export() * all end up in here, and if any of them race we shouldn't * call extra class_export_puts(). */ if (already_disconnected) { LASSERT(cfs_hlist_unhashed(&export->exp_nid_hash)); GOTO(no_disconn, already_disconnected); } CDEBUG(D_IOCTL, "disconnect: cookie "LPX64"\n", export->exp_handle.h_cookie); if (!cfs_hlist_unhashed(&export->exp_nid_hash)) cfs_hash_del(export->exp_obd->obd_nid_hash, &export->exp_connection->c_peer.nid, &export->exp_nid_hash); class_export_recovery_cleanup(export); class_unlink_export(export); no_disconn: class_export_put(export); RETURN(0); } /* Return non-zero for a fully connected export */ int class_connected_export(struct obd_export *exp) { if (exp) { int connected; cfs_spin_lock(&exp->exp_lock); connected = (exp->exp_conn_cnt > 0); cfs_spin_unlock(&exp->exp_lock); return connected; } return 0; } EXPORT_SYMBOL(class_connected_export); static void class_disconnect_export_list(cfs_list_t *list, enum obd_option flags) { int rc; struct obd_export *exp; ENTRY; /* It's possible that an export may disconnect itself, but * nothing else will be added to this list. */ while (!cfs_list_empty(list)) { exp = cfs_list_entry(list->next, struct obd_export, exp_obd_chain); /* need for safe call CDEBUG after obd_disconnect */ class_export_get(exp); cfs_spin_lock(&exp->exp_lock); exp->exp_flags = flags; cfs_spin_unlock(&exp->exp_lock); if (obd_uuid_equals(&exp->exp_client_uuid, &exp->exp_obd->obd_uuid)) { CDEBUG(D_HA, "exp %p export uuid == obd uuid, don't discon\n", exp); /* Need to delete this now so we don't end up pointing * to work_list later when this export is cleaned up. */ cfs_list_del_init(&exp->exp_obd_chain); class_export_put(exp); continue; } class_export_get(exp); CDEBUG(D_HA, "%s: disconnecting export at %s (%p), " "last request at "CFS_TIME_T"\n", exp->exp_obd->obd_name, obd_export_nid2str(exp), exp, exp->exp_last_request_time); /* release one export reference anyway */ rc = obd_disconnect(exp); CDEBUG(D_HA, "disconnected export at %s (%p): rc %d\n", obd_export_nid2str(exp), exp, rc); class_export_put(exp); } EXIT; } void class_disconnect_exports(struct obd_device *obd) { cfs_list_t work_list; ENTRY; /* Move all of the exports from obd_exports to a work list, en masse. */ CFS_INIT_LIST_HEAD(&work_list); cfs_spin_lock(&obd->obd_dev_lock); cfs_list_splice_init(&obd->obd_exports, &work_list); cfs_list_splice_init(&obd->obd_delayed_exports, &work_list); cfs_spin_unlock(&obd->obd_dev_lock); if (!cfs_list_empty(&work_list)) { CDEBUG(D_HA, "OBD device %d (%p) has exports, " "disconnecting them\n", obd->obd_minor, obd); class_disconnect_export_list(&work_list, exp_flags_from_obd(obd)); } else CDEBUG(D_HA, "OBD device %d (%p) has no exports\n", obd->obd_minor, obd); EXIT; } EXPORT_SYMBOL(class_disconnect_exports); /* Remove exports that have not completed recovery. */ void class_disconnect_stale_exports(struct obd_device *obd, int (*test_export)(struct obd_export *)) { cfs_list_t work_list; cfs_list_t *pos, *n; struct obd_export *exp; int evicted = 0; ENTRY; CFS_INIT_LIST_HEAD(&work_list); cfs_spin_lock(&obd->obd_dev_lock); cfs_list_for_each_safe(pos, n, &obd->obd_exports) { exp = cfs_list_entry(pos, struct obd_export, exp_obd_chain); if (test_export(exp)) continue; /* don't count self-export as client */ if (obd_uuid_equals(&exp->exp_client_uuid, &exp->exp_obd->obd_uuid)) continue; cfs_list_move(&exp->exp_obd_chain, &work_list); evicted++; CDEBUG(D_ERROR, "%s: disconnect stale client %s@%s\n", obd->obd_name, exp->exp_client_uuid.uuid, exp->exp_connection == NULL ? "" : libcfs_nid2str(exp->exp_connection->c_peer.nid)); print_export_data(exp, "EVICTING", 0); } cfs_spin_unlock(&obd->obd_dev_lock); if (evicted) { CDEBUG(D_HA, "%s: disconnecting %d stale clients\n", obd->obd_name, evicted); obd->obd_stale_clients += evicted; } class_disconnect_export_list(&work_list, exp_flags_from_obd(obd) | OBD_OPT_ABORT_RECOV); EXIT; } EXPORT_SYMBOL(class_disconnect_stale_exports); void class_fail_export(struct obd_export *exp) { int rc, already_failed; cfs_spin_lock(&exp->exp_lock); already_failed = exp->exp_failed; exp->exp_failed = 1; cfs_spin_unlock(&exp->exp_lock); if (already_failed) { CDEBUG(D_HA, "disconnecting dead export %p/%s; skipping\n", exp, exp->exp_client_uuid.uuid); return; } CDEBUG(D_HA, "disconnecting export %p/%s\n", exp, exp->exp_client_uuid.uuid); if (obd_dump_on_timeout) libcfs_debug_dumplog(); /* Most callers into obd_disconnect are removing their own reference * (request, for example) in addition to the one from the hash table. * We don't have such a reference here, so make one. */ class_export_get(exp); rc = obd_disconnect(exp); if (rc) CERROR("disconnecting export %p failed: %d\n", exp, rc); else CDEBUG(D_HA, "disconnected export %p/%s\n", exp, exp->exp_client_uuid.uuid); } EXPORT_SYMBOL(class_fail_export); char *obd_export_nid2str(struct obd_export *exp) { if (exp->exp_connection != NULL) return libcfs_nid2str(exp->exp_connection->c_peer.nid); return "(no nid)"; } EXPORT_SYMBOL(obd_export_nid2str); int obd_export_evict_by_nid(struct obd_device *obd, const char *nid) { struct obd_export *doomed_exp = NULL; int exports_evicted = 0; lnet_nid_t nid_key = libcfs_str2nid((char *)nid); do { doomed_exp = cfs_hash_lookup(obd->obd_nid_hash, &nid_key); if (doomed_exp == NULL) break; LASSERTF(doomed_exp->exp_connection->c_peer.nid == nid_key, "nid %s found, wanted nid %s, requested nid %s\n", obd_export_nid2str(doomed_exp), libcfs_nid2str(nid_key), nid); LASSERTF(doomed_exp != obd->obd_self_export, "self-export is hashed by NID?\n"); exports_evicted++; CWARN("%s: evict NID '%s' (%s) #%d at adminstrative request\n", obd->obd_name, nid, doomed_exp->exp_client_uuid.uuid, exports_evicted); class_fail_export(doomed_exp); class_export_put(doomed_exp); } while (1); if (!exports_evicted) CDEBUG(D_HA,"%s: can't disconnect NID '%s': no exports found\n", obd->obd_name, nid); return exports_evicted; } EXPORT_SYMBOL(obd_export_evict_by_nid); int obd_export_evict_by_uuid(struct obd_device *obd, const char *uuid) { struct obd_export *doomed_exp = NULL; struct obd_uuid doomed_uuid; int exports_evicted = 0; obd_str2uuid(&doomed_uuid, uuid); if (obd_uuid_equals(&doomed_uuid, &obd->obd_uuid)) { CERROR("%s: can't evict myself\n", obd->obd_name); return exports_evicted; } doomed_exp = cfs_hash_lookup(obd->obd_uuid_hash, &doomed_uuid); if (doomed_exp == NULL) { CERROR("%s: can't disconnect %s: no exports found\n", obd->obd_name, uuid); } else { CWARN("%s: evicting %s at adminstrative request\n", obd->obd_name, doomed_exp->exp_client_uuid.uuid); class_fail_export(doomed_exp); class_export_put(doomed_exp); exports_evicted++; } return exports_evicted; } EXPORT_SYMBOL(obd_export_evict_by_uuid); #if LUSTRE_TRACKS_LOCK_EXP_REFS void (*class_export_dump_hook)(struct obd_export*) = NULL; EXPORT_SYMBOL(class_export_dump_hook); #endif static void print_export_data(struct obd_export *exp, const char *status, int locks) { struct ptlrpc_reply_state *rs; struct ptlrpc_reply_state *first_reply = NULL; int nreplies = 0; cfs_spin_lock(&exp->exp_lock); cfs_list_for_each_entry(rs, &exp->exp_outstanding_replies, rs_exp_list) { if (nreplies == 0) first_reply = rs; nreplies++; } cfs_spin_unlock(&exp->exp_lock); CDEBUG(D_HA, "%s: %s %p %s %s %d (%d %d %d) %d %d %d %d: %p %s "LPU64"\n", exp->exp_obd->obd_name, status, exp, exp->exp_client_uuid.uuid, obd_export_nid2str(exp), cfs_atomic_read(&exp->exp_refcount), cfs_atomic_read(&exp->exp_rpc_count), cfs_atomic_read(&exp->exp_cb_count), cfs_atomic_read(&exp->exp_locks_count), exp->exp_disconnected, exp->exp_delayed, exp->exp_failed, nreplies, first_reply, nreplies > 3 ? "..." : "", exp->exp_last_committed); #if LUSTRE_TRACKS_LOCK_EXP_REFS if (locks && class_export_dump_hook != NULL) class_export_dump_hook(exp); #endif } void dump_exports(struct obd_device *obd, int locks) { struct obd_export *exp; cfs_spin_lock(&obd->obd_dev_lock); cfs_list_for_each_entry(exp, &obd->obd_exports, exp_obd_chain) print_export_data(exp, "ACTIVE", locks); cfs_list_for_each_entry(exp, &obd->obd_unlinked_exports, exp_obd_chain) print_export_data(exp, "UNLINKED", locks); cfs_list_for_each_entry(exp, &obd->obd_delayed_exports, exp_obd_chain) print_export_data(exp, "DELAYED", locks); cfs_spin_unlock(&obd->obd_dev_lock); cfs_spin_lock(&obd_zombie_impexp_lock); cfs_list_for_each_entry(exp, &obd_zombie_exports, exp_obd_chain) print_export_data(exp, "ZOMBIE", locks); cfs_spin_unlock(&obd_zombie_impexp_lock); } EXPORT_SYMBOL(dump_exports); void obd_exports_barrier(struct obd_device *obd) { int waited = 2; LASSERT(cfs_list_empty(&obd->obd_exports)); cfs_spin_lock(&obd->obd_dev_lock); while (!cfs_list_empty(&obd->obd_unlinked_exports)) { cfs_spin_unlock(&obd->obd_dev_lock); cfs_schedule_timeout_and_set_state(CFS_TASK_UNINT, cfs_time_seconds(waited)); if (waited > 5 && IS_PO2(waited)) { LCONSOLE_WARN("%s is waiting for obd_unlinked_exports " "more than %d seconds. " "The obd refcount = %d. Is it stuck?\n", obd->obd_name, waited, cfs_atomic_read(&obd->obd_refcount)); dump_exports(obd, 0); } waited *= 2; cfs_spin_lock(&obd->obd_dev_lock); } cfs_spin_unlock(&obd->obd_dev_lock); } EXPORT_SYMBOL(obd_exports_barrier); /** * kill zombie imports and exports */ void obd_zombie_impexp_cull(void) { struct obd_import *import; struct obd_export *export; ENTRY; do { cfs_spin_lock(&obd_zombie_impexp_lock); import = NULL; if (!cfs_list_empty(&obd_zombie_imports)) { import = cfs_list_entry(obd_zombie_imports.next, struct obd_import, imp_zombie_chain); cfs_list_del_init(&import->imp_zombie_chain); } export = NULL; if (!cfs_list_empty(&obd_zombie_exports)) { export = cfs_list_entry(obd_zombie_exports.next, struct obd_export, exp_obd_chain); cfs_list_del_init(&export->exp_obd_chain); } cfs_spin_unlock(&obd_zombie_impexp_lock); if (import != NULL) class_import_destroy(import); if (export != NULL) class_export_destroy(export); } while (import != NULL || export != NULL); EXIT; } static cfs_completion_t obd_zombie_start; static cfs_completion_t obd_zombie_stop; static unsigned long obd_zombie_flags; static cfs_waitq_t obd_zombie_waitq; static pid_t obd_zombie_pid; enum { OBD_ZOMBIE_STOP = 1 << 1 }; /** * check for work for kill zombie import/export thread. */ static int obd_zombie_impexp_check(void *arg) { int rc; cfs_spin_lock(&obd_zombie_impexp_lock); rc = cfs_list_empty(&obd_zombie_imports) && cfs_list_empty(&obd_zombie_exports) && !cfs_test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags); cfs_spin_unlock(&obd_zombie_impexp_lock); RETURN(rc); } /** * Add export to the obd_zombe thread and notify it. */ static void obd_zombie_export_add(struct obd_export *exp) { cfs_spin_lock(&exp->exp_obd->obd_dev_lock); LASSERT(!cfs_list_empty(&exp->exp_obd_chain)); cfs_list_del_init(&exp->exp_obd_chain); cfs_spin_unlock(&exp->exp_obd->obd_dev_lock); cfs_spin_lock(&obd_zombie_impexp_lock); cfs_list_add(&exp->exp_obd_chain, &obd_zombie_exports); cfs_spin_unlock(&obd_zombie_impexp_lock); if (obd_zombie_impexp_notify != NULL) obd_zombie_impexp_notify(); } /** * Add import to the obd_zombe thread and notify it. */ static void obd_zombie_import_add(struct obd_import *imp) { LASSERT(imp->imp_sec == NULL); cfs_spin_lock(&obd_zombie_impexp_lock); LASSERT(cfs_list_empty(&imp->imp_zombie_chain)); cfs_list_add(&imp->imp_zombie_chain, &obd_zombie_imports); cfs_spin_unlock(&obd_zombie_impexp_lock); if (obd_zombie_impexp_notify != NULL) obd_zombie_impexp_notify(); } /** * notify import/export destroy thread about new zombie. */ static void obd_zombie_impexp_notify(void) { cfs_waitq_signal(&obd_zombie_waitq); } /** * check whether obd_zombie is idle */ static int obd_zombie_is_idle(void) { int rc; LASSERT(!cfs_test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)); cfs_spin_lock(&obd_zombie_impexp_lock); rc = cfs_list_empty(&obd_zombie_imports) && cfs_list_empty(&obd_zombie_exports); cfs_spin_unlock(&obd_zombie_impexp_lock); return rc; } /** * wait when obd_zombie import/export queues become empty */ void obd_zombie_barrier(void) { struct l_wait_info lwi = { 0 }; if (obd_zombie_pid == cfs_curproc_pid()) /* don't wait for myself */ return; l_wait_event(obd_zombie_waitq, obd_zombie_is_idle(), &lwi); } EXPORT_SYMBOL(obd_zombie_barrier); #ifdef __KERNEL__ /** * destroy zombie export/import thread. */ static int obd_zombie_impexp_thread(void *unused) { int rc; if ((rc = cfs_daemonize_ctxt("obd_zombid"))) { cfs_complete(&obd_zombie_start); RETURN(rc); } cfs_complete(&obd_zombie_start); obd_zombie_pid = cfs_curproc_pid(); while(!cfs_test_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags)) { struct l_wait_info lwi = { 0 }; l_wait_event(obd_zombie_waitq, !obd_zombie_impexp_check(NULL), &lwi); obd_zombie_impexp_cull(); /* * Notify obd_zombie_barrier callers that queues * may be empty. */ cfs_waitq_signal(&obd_zombie_waitq); } cfs_complete(&obd_zombie_stop); RETURN(0); } #else /* ! KERNEL */ static cfs_atomic_t zombie_recur = CFS_ATOMIC_INIT(0); static void *obd_zombie_impexp_work_cb; static void *obd_zombie_impexp_idle_cb; int obd_zombie_impexp_kill(void *arg) { int rc = 0; if (cfs_atomic_inc_return(&zombie_recur) == 1) { obd_zombie_impexp_cull(); rc = 1; } cfs_atomic_dec(&zombie_recur); return rc; } #endif /** * start destroy zombie import/export thread */ int obd_zombie_impexp_init(void) { int rc; CFS_INIT_LIST_HEAD(&obd_zombie_imports); CFS_INIT_LIST_HEAD(&obd_zombie_exports); cfs_spin_lock_init(&obd_zombie_impexp_lock); cfs_init_completion(&obd_zombie_start); cfs_init_completion(&obd_zombie_stop); cfs_waitq_init(&obd_zombie_waitq); obd_zombie_pid = 0; #ifdef __KERNEL__ rc = cfs_kernel_thread(obd_zombie_impexp_thread, NULL, 0); if (rc < 0) RETURN(rc); cfs_wait_for_completion(&obd_zombie_start); #else obd_zombie_impexp_work_cb = liblustre_register_wait_callback("obd_zombi_impexp_kill", &obd_zombie_impexp_kill, NULL); obd_zombie_impexp_idle_cb = liblustre_register_idle_callback("obd_zombi_impexp_check", &obd_zombie_impexp_check, NULL); rc = 0; #endif RETURN(rc); } /** * stop destroy zombie import/export thread */ void obd_zombie_impexp_stop(void) { cfs_set_bit(OBD_ZOMBIE_STOP, &obd_zombie_flags); obd_zombie_impexp_notify(); #ifdef __KERNEL__ cfs_wait_for_completion(&obd_zombie_stop); #else liblustre_deregister_wait_callback(obd_zombie_impexp_work_cb); liblustre_deregister_idle_callback(obd_zombie_impexp_idle_cb); #endif }