From patchwork Mon May 20 12:50:59 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Simmons X-Patchwork-Id: 10951025 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 321BE17E0 for ; Mon, 20 May 2019 12:51:50 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1EF5228689 for ; Mon, 20 May 2019 12:51:50 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 13E7428787; Mon, 20 May 2019 12:51:50 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from pdx1-mailman02.dreamhost.com (pdx1-mailman02.dreamhost.com [64.90.62.194]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id EA53128689 for ; Mon, 20 May 2019 12:51:47 +0000 (UTC) Received: from pdx1-mailman02.dreamhost.com (localhost [IPv6:::1]) by pdx1-mailman02.dreamhost.com (Postfix) with ESMTP id 52E1B21F709; Mon, 20 May 2019 05:51:35 -0700 (PDT) X-Original-To: lustre-devel@lists.lustre.org Delivered-To: lustre-devel-lustre.org@pdx1-mailman02.dreamhost.com Received: from smtp4.ccs.ornl.gov (smtp4.ccs.ornl.gov [160.91.203.40]) by pdx1-mailman02.dreamhost.com (Postfix) with ESMTP id ABBC621F3FC for ; Mon, 20 May 2019 05:51:20 -0700 (PDT) Received: from star.ccs.ornl.gov (star.ccs.ornl.gov [160.91.202.134]) by smtp4.ccs.ornl.gov (Postfix) with ESMTP id 791B2100519E; Mon, 20 May 2019 08:51:13 -0400 (EDT) Received: by star.ccs.ornl.gov (Postfix, from userid 2004) id 7728F2B7; Mon, 20 May 2019 08:51:13 -0400 (EDT) From: James Simmons To: Andreas Dilger , Oleg Drokin , NeilBrown Date: Mon, 20 May 2019 08:50:59 -0400 Message-Id: <1558356671-29599-18-git-send-email-jsimmons@infradead.org> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1558356671-29599-1-git-send-email-jsimmons@infradead.org> References: <1558356671-29599-1-git-send-email-jsimmons@infradead.org> Subject: [lustre-devel] [PATCH v2 17/29] lustre: handle: move refcount into the lustre_handle. X-BeenThere: lustre-devel@lists.lustre.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "For discussing Lustre software development." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lustre Development List MIME-Version: 1.0 Errors-To: lustre-devel-bounces@lists.lustre.org Sender: "lustre-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: NeilBrown Every object with a lustre_handle has (and must have) a refcount. The lustre_handles code needs a call-out to increment this. To simplify things, move the refcount into the lustre_handle and discard the call-out. In order to preserve the same debug messages, we store an object type name in the portals_handle_ops, and use that in a CDEBUG() when incrementing the ref count. Reviewed-by: Andreas Dilger Signed-off-by: NeilBrown --- fs/lustre/include/lustre_dlm.h | 6 ----- fs/lustre/include/lustre_export.h | 1 - fs/lustre/include/lustre_handles.h | 4 ++- fs/lustre/include/lustre_import.h | 2 -- fs/lustre/ldlm/ldlm_lock.c | 36 +++++++++++--------------- fs/lustre/obdclass/genops.c | 50 +++++++++++++++---------------------- fs/lustre/obdclass/lustre_handles.c | 5 +++- fs/lustre/obdecho/echo_client.c | 2 +- fs/lustre/ptlrpc/service.c | 4 +-- 9 files changed, 45 insertions(+), 65 deletions(-) diff --git a/fs/lustre/include/lustre_dlm.h b/fs/lustre/include/lustre_dlm.h index 1bd5119..fd9b0f8 100644 --- a/fs/lustre/include/lustre_dlm.h +++ b/fs/lustre/include/lustre_dlm.h @@ -591,12 +591,6 @@ struct ldlm_lock { */ struct portals_handle l_handle; /** - * Lock reference count. - * This is how many users have pointers to actual structure, so that - * we do not accidentally free lock structure that is in use. - */ - atomic_t l_refc; - /** * Internal spinlock protects l_resource. We should hold this lock * first before taking res_lock. */ diff --git a/fs/lustre/include/lustre_export.h b/fs/lustre/include/lustre_export.h index fb34e0b..d053233 100644 --- a/fs/lustre/include/lustre_export.h +++ b/fs/lustre/include/lustre_export.h @@ -67,7 +67,6 @@ struct obd_export { * what export they are talking to. */ struct portals_handle exp_handle; - refcount_t exp_refcount; /** * Set of counters below is to track where export references are * kept. The exp_rpc_count is used for reconnect handling also, diff --git a/fs/lustre/include/lustre_handles.h b/fs/lustre/include/lustre_handles.h index 9a4b1a8..be5d41b 100644 --- a/fs/lustre/include/lustre_handles.h +++ b/fs/lustre/include/lustre_handles.h @@ -46,8 +46,9 @@ #include struct portals_handle_ops { - void (*hop_addref)(void *object); void (*hop_free)(void *object, int size); + /* hop_type is used for some debugging messages */ + char *hop_type; }; /* These handles are most easily used by having them appear at the very top of @@ -66,6 +67,7 @@ struct portals_handle { struct list_head h_link; u64 h_cookie; const struct portals_handle_ops *h_ops; + refcount_t h_ref; /* newly added fields to handle the RCU issue. -jxiong */ struct rcu_head h_rcu; diff --git a/fs/lustre/include/lustre_import.h b/fs/lustre/include/lustre_import.h index fc1f87c..6c830da 100644 --- a/fs/lustre/include/lustre_import.h +++ b/fs/lustre/include/lustre_import.h @@ -154,8 +154,6 @@ struct import_state_hist { struct obd_import { /** Local handle (== id) for this import. */ struct portals_handle imp_handle; - /** Reference counter */ - atomic_t imp_refcount; struct lustre_handle imp_dlm_handle; /* client's ldlm export */ /** Currently active connection */ struct ptlrpc_connection *imp_connection; diff --git a/fs/lustre/ldlm/ldlm_lock.c b/fs/lustre/ldlm/ldlm_lock.c index 768cccc..ecd3f4a 100644 --- a/fs/lustre/ldlm/ldlm_lock.c +++ b/fs/lustre/ldlm/ldlm_lock.c @@ -148,7 +148,7 @@ const char *ldlm_it2str(enum ldlm_intent_flags it) */ struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock) { - atomic_inc(&lock->l_refc); + refcount_inc(&lock->l_handle.h_ref); return lock; } EXPORT_SYMBOL(ldlm_lock_get); @@ -161,8 +161,8 @@ struct ldlm_lock *ldlm_lock_get(struct ldlm_lock *lock) void ldlm_lock_put(struct ldlm_lock *lock) { LASSERT(lock->l_resource != LP_POISON); - LASSERT(atomic_read(&lock->l_refc) > 0); - if (atomic_dec_and_test(&lock->l_refc)) { + LASSERT(refcount_read(&lock->l_handle.h_ref) > 0); + if (refcount_dec_and_test(&lock->l_handle.h_ref)) { struct ldlm_resource *res; LDLM_DEBUG(lock, @@ -356,12 +356,6 @@ void ldlm_lock_destroy_nolock(struct ldlm_lock *lock) } } -/* this is called by portals_handle2object with the handle lock taken */ -static void lock_handle_addref(void *lock) -{ - LDLM_LOCK_GET((struct ldlm_lock *)lock); -} - static void lock_handle_free(void *lock, int size) { LASSERT(size == sizeof(struct ldlm_lock)); @@ -369,8 +363,8 @@ static void lock_handle_free(void *lock, int size) } static struct portals_handle_ops lock_handle_ops = { - .hop_addref = lock_handle_addref, .hop_free = lock_handle_free, + .hop_type = "ldlm", }; /** @@ -395,7 +389,7 @@ static struct ldlm_lock *ldlm_lock_new(struct ldlm_resource *resource) lock->l_resource = resource; lu_ref_add(&resource->lr_reference, "lock", lock); - atomic_set(&lock->l_refc, 2); + refcount_set(&lock->l_handle.h_ref, 2); INIT_LIST_HEAD(&lock->l_res_link); INIT_LIST_HEAD(&lock->l_lru); INIT_LIST_HEAD(&lock->l_pending_chain); @@ -1996,13 +1990,13 @@ void _ldlm_lock_debug(struct ldlm_lock *lock, &vaf, lock, lock->l_handle.h_cookie, - atomic_read(&lock->l_refc), + refcount_read(&lock->l_handle.h_ref), lock->l_readers, lock->l_writers, ldlm_lockname[lock->l_granted_mode], ldlm_lockname[lock->l_req_mode], lock->l_flags, nid, lock->l_remote_handle.cookie, - exp ? refcount_read(&exp->exp_refcount) : -99, + exp ? refcount_read(&exp->exp_handle.h_ref) : -99, lock->l_pid, lock->l_callback_timeout, lock->l_lvb_type); va_end(args); @@ -2016,7 +2010,7 @@ void _ldlm_lock_debug(struct ldlm_lock *lock, &vaf, ldlm_lock_to_ns_name(lock), lock, lock->l_handle.h_cookie, - atomic_read(&lock->l_refc), + refcount_read(&lock->l_handle.h_ref), lock->l_readers, lock->l_writers, ldlm_lockname[lock->l_granted_mode], ldlm_lockname[lock->l_req_mode], @@ -2029,7 +2023,7 @@ void _ldlm_lock_debug(struct ldlm_lock *lock, lock->l_req_extent.end, lock->l_flags, nid, lock->l_remote_handle.cookie, - exp ? refcount_read(&exp->exp_refcount) : -99, + exp ? refcount_read(&exp->exp_handle.h_ref) : -99, lock->l_pid, lock->l_callback_timeout, lock->l_lvb_type); break; @@ -2040,7 +2034,7 @@ void _ldlm_lock_debug(struct ldlm_lock *lock, &vaf, ldlm_lock_to_ns_name(lock), lock, lock->l_handle.h_cookie, - atomic_read(&lock->l_refc), + refcount_read(&lock->l_handle.h_ref), lock->l_readers, lock->l_writers, ldlm_lockname[lock->l_granted_mode], ldlm_lockname[lock->l_req_mode], @@ -2052,7 +2046,7 @@ void _ldlm_lock_debug(struct ldlm_lock *lock, lock->l_policy_data.l_flock.end, lock->l_flags, nid, lock->l_remote_handle.cookie, - exp ? refcount_read(&exp->exp_refcount) : -99, + exp ? refcount_read(&exp->exp_handle.h_ref) : -99, lock->l_pid, lock->l_callback_timeout); break; @@ -2062,7 +2056,7 @@ void _ldlm_lock_debug(struct ldlm_lock *lock, &vaf, ldlm_lock_to_ns_name(lock), lock, lock->l_handle.h_cookie, - atomic_read(&lock->l_refc), + refcount_read(&lock->l_handle.h_ref), lock->l_readers, lock->l_writers, ldlm_lockname[lock->l_granted_mode], ldlm_lockname[lock->l_req_mode], @@ -2072,7 +2066,7 @@ void _ldlm_lock_debug(struct ldlm_lock *lock, ldlm_typename[resource->lr_type], lock->l_flags, nid, lock->l_remote_handle.cookie, - exp ? refcount_read(&exp->exp_refcount) : -99, + exp ? refcount_read(&exp->exp_handle.h_ref) : -99, lock->l_pid, lock->l_callback_timeout, lock->l_lvb_type); break; @@ -2083,7 +2077,7 @@ void _ldlm_lock_debug(struct ldlm_lock *lock, &vaf, ldlm_lock_to_ns_name(lock), lock, lock->l_handle.h_cookie, - atomic_read(&lock->l_refc), + refcount_read(&lock->l_handle.h_ref), lock->l_readers, lock->l_writers, ldlm_lockname[lock->l_granted_mode], ldlm_lockname[lock->l_req_mode], @@ -2092,7 +2086,7 @@ void _ldlm_lock_debug(struct ldlm_lock *lock, ldlm_typename[resource->lr_type], lock->l_flags, nid, lock->l_remote_handle.cookie, - exp ? refcount_read(&exp->exp_refcount) : -99, + exp ? refcount_read(&exp->exp_handle.h_ref) : -99, lock->l_pid, lock->l_callback_timeout, lock->l_lvb_type); break; diff --git a/fs/lustre/obdclass/genops.c b/fs/lustre/obdclass/genops.c index f1fb64b..c6dc3ba 100644 --- a/fs/lustre/obdclass/genops.c +++ b/fs/lustre/obdclass/genops.c @@ -722,7 +722,7 @@ static void class_export_destroy(struct obd_export *exp) { struct obd_device *obd = exp->exp_obd; - LASSERT(refcount_read(&exp->exp_refcount) == 0); + LASSERT(refcount_read(&exp->exp_handle.h_ref) == 0); LASSERT(obd); CDEBUG(D_IOCTL, "destroying export %p/%s for %s\n", exp, @@ -746,33 +746,28 @@ static void class_export_destroy(struct obd_export *exp) OBD_FREE_RCU(exp, sizeof(*exp), &exp->exp_handle); } -static void export_handle_addref(void *export) -{ - class_export_get(export); -} - static struct portals_handle_ops export_handle_ops = { - .hop_addref = export_handle_addref, .hop_free = NULL, + .hop_type = "export", }; struct obd_export *class_export_get(struct obd_export *exp) { - refcount_inc(&exp->exp_refcount); - CDEBUG(D_INFO, "GETting export %p : new refcount %d\n", exp, - refcount_read(&exp->exp_refcount)); + refcount_inc(&exp->exp_handle.h_ref); + CDEBUG(D_INFO, "GET export %p refcount=%d\n", exp, + refcount_read(&exp->exp_handle.h_ref)); return exp; } EXPORT_SYMBOL(class_export_get); void class_export_put(struct obd_export *exp) { - LASSERT(refcount_read(&exp->exp_refcount) > 0); - LASSERT(refcount_read(&exp->exp_refcount) < LI_POISON); + LASSERT(refcount_read(&exp->exp_handle.h_ref) > 0); + LASSERT(refcount_read(&exp->exp_handle.h_ref) < LI_POISON); CDEBUG(D_INFO, "PUTting export %p : new refcount %d\n", exp, - refcount_read(&exp->exp_refcount) - 1); + refcount_read(&exp->exp_handle.h_ref) - 1); - if (refcount_dec_and_test(&exp->exp_refcount)) { + if (refcount_dec_and_test(&exp->exp_handle.h_ref)) { struct obd_device *obd = exp->exp_obd; CDEBUG(D_IOCTL, "final put %p/%s\n", @@ -822,7 +817,7 @@ static struct obd_export *__class_new_export(struct obd_device *obd, export->exp_conn_cnt = 0; /* 2 = class_handle_hash + last */ - refcount_set(&export->exp_refcount, 2); + refcount_set(&export->exp_handle.h_ref, 2); atomic_set(&export->exp_rpc_count, 0); atomic_set(&export->exp_cb_count, 0); atomic_set(&export->exp_locks_count, 0); @@ -925,7 +920,7 @@ static void class_import_destroy(struct obd_import *imp) CDEBUG(D_IOCTL, "destroying import %p for %s\n", imp, imp->imp_obd->obd_name); - LASSERT_ATOMIC_ZERO(&imp->imp_refcount); + LASSERT(refcount_read(&imp->imp_handle.h_ref) == 0); ptlrpc_put_connection_superhack(imp->imp_connection); @@ -942,21 +937,16 @@ static void class_import_destroy(struct obd_import *imp) OBD_FREE_RCU(imp, sizeof(*imp), &imp->imp_handle); } -static void import_handle_addref(void *import) -{ - class_import_get(import); -} - static struct portals_handle_ops import_handle_ops = { - .hop_addref = import_handle_addref, .hop_free = NULL, + .hop_type = "import", }; struct obd_import *class_import_get(struct obd_import *import) { - atomic_inc(&import->imp_refcount); - CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", import, - atomic_read(&import->imp_refcount), + refcount_inc(&import->imp_handle.h_ref); + CDEBUG(D_INFO, "GET import %p refcount=%d obd=%s\n", import, + refcount_read(&import->imp_handle.h_ref), import->imp_obd->obd_name); return import; } @@ -964,19 +954,19 @@ struct obd_import *class_import_get(struct obd_import *import) void class_import_put(struct obd_import *imp) { - LASSERT_ATOMIC_GT_LT(&imp->imp_refcount, 0, LI_POISON); + LASSERT(refcount_read(&imp->imp_handle.h_ref) > 0); CDEBUG(D_INFO, "import %p refcount=%d obd=%s\n", imp, - atomic_read(&imp->imp_refcount) - 1, + refcount_read(&imp->imp_handle.h_ref) - 1, imp->imp_obd->obd_name); - if (atomic_dec_and_test(&imp->imp_refcount)) { + if (refcount_dec_and_test(&imp->imp_handle.h_ref)) { CDEBUG(D_INFO, "final put import %p\n", imp); obd_zombie_import_add(imp); } /* catch possible import put race */ - LASSERT_ATOMIC_GE_LT(&imp->imp_refcount, 0, LI_POISON); + LASSERT(refcount_read(&imp->imp_handle.h_ref) >= 0); } EXPORT_SYMBOL(class_import_put); @@ -1026,7 +1016,7 @@ struct obd_import *class_new_import(struct obd_device *obd) init_waitqueue_head(&imp->imp_recovery_waitq); INIT_WORK(&imp->imp_zombie_work, obd_zombie_imp_cull); - atomic_set(&imp->imp_refcount, 2); + refcount_set(&imp->imp_handle.h_ref, 2); atomic_set(&imp->imp_unregistering, 0); atomic_set(&imp->imp_inflight, 0); atomic_set(&imp->imp_replay_inflight, 0); diff --git a/fs/lustre/obdclass/lustre_handles.c b/fs/lustre/obdclass/lustre_handles.c index 32b70d6..32cd6ae 100644 --- a/fs/lustre/obdclass/lustre_handles.c +++ b/fs/lustre/obdclass/lustre_handles.c @@ -152,7 +152,10 @@ void *class_handle2object(u64 cookie, const struct portals_handle_ops *ops) spin_lock(&h->h_lock); if (likely(h->h_in != 0)) { - h->h_ops->hop_addref(h); + refcount_inc(&h->h_ref); + CDEBUG(D_INFO, "GET %s %p refcount=%d\n", + h->h_ops->hop_type, h, + refcount_read(&h->h_ref)); retval = h; } spin_unlock(&h->h_lock); diff --git a/fs/lustre/obdecho/echo_client.c b/fs/lustre/obdecho/echo_client.c index baf34c8..6f00eee 100644 --- a/fs/lustre/obdecho/echo_client.c +++ b/fs/lustre/obdecho/echo_client.c @@ -1638,7 +1638,7 @@ static int echo_client_cleanup(struct obd_device *obddev) return -EBUSY; } - LASSERT(refcount_read(&ec->ec_exp->exp_refcount) > 0); + LASSERT(refcount_read(&ec->ec_exp->exp_handle.h_ref) > 0); rc = obd_disconnect(ec->ec_exp); if (rc != 0) CERROR("fail to disconnect device: %d\n", rc); diff --git a/fs/lustre/ptlrpc/service.c b/fs/lustre/ptlrpc/service.c index 5a7e9fa..5e541ca 100644 --- a/fs/lustre/ptlrpc/service.c +++ b/fs/lustre/ptlrpc/service.c @@ -1697,7 +1697,7 @@ static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt, (request->rq_export ? (char *)request->rq_export->exp_client_uuid.uuid : "0"), (request->rq_export ? - refcount_read(&request->rq_export->exp_refcount) : -99), + refcount_read(&request->rq_export->exp_handle.h_ref) : -99), lustre_msg_get_status(request->rq_reqmsg), request->rq_xid, libcfs_id2str(request->rq_peer), lustre_msg_get_opc(request->rq_reqmsg)); @@ -1741,7 +1741,7 @@ static bool ptlrpc_server_normal_pending(struct ptlrpc_service_part *svcpt, (request->rq_export ? (char *)request->rq_export->exp_client_uuid.uuid : "0"), (request->rq_export ? - refcount_read(&request->rq_export->exp_refcount) : -99), + refcount_read(&request->rq_export->exp_handle.h_ref) : -99), lustre_msg_get_status(request->rq_reqmsg), request->rq_xid, libcfs_id2str(request->rq_peer),