From patchwork Mon May 20 12:50:53 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Simmons X-Patchwork-Id: 10951035 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 B078576 for ; Mon, 20 May 2019 12:52:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9E9DA28770 for ; Mon, 20 May 2019 12:52:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9348E28735; Mon, 20 May 2019 12:52:10 +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 0DD582882D for ; Mon, 20 May 2019 12:52:10 +0000 (UTC) Received: from pdx1-mailman02.dreamhost.com (localhost [IPv6:::1]) by pdx1-mailman02.dreamhost.com (Postfix) with ESMTP id A8C8921F8D2; Mon, 20 May 2019 05:51:46 -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 6ACAF21F2B2 for ; Mon, 20 May 2019 05:51:18 -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 6719B1005197; Mon, 20 May 2019 08:51:13 -0400 (EDT) Received: by star.ccs.ornl.gov (Postfix, from userid 2004) id 648A32BB; Mon, 20 May 2019 08:51:13 -0400 (EDT) From: James Simmons To: Andreas Dilger , Oleg Drokin , NeilBrown Date: Mon, 20 May 2019 08:50:53 -0400 Message-Id: <1558356671-29599-12-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 11/29] lustre: obdclass: don't copy ops structures in to new type. 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 The obd_ops and md_ops structures passed to class_register_type() are read-only, and have a lifetime that is exceeds the lifetime of the obd_type - they are static in a module which unregisters the type before being unloaded. So there is no need to copy the ops, just store a pointer. Also mark all the structures as read-only to confirm they don't get written. This is best-practice for structures of function pointers. Reviewed-by: James Simmons Signed-off-by: NeilBrown --- fs/lustre/include/obd.h | 4 ++-- fs/lustre/include/obd_class.h | 3 ++- fs/lustre/lmv/lmv_obd.c | 4 ++-- fs/lustre/lov/lov_obd.c | 2 +- fs/lustre/mdc/mdc_request.c | 4 ++-- fs/lustre/mgc/mgc_request.c | 2 +- fs/lustre/obdclass/genops.c | 22 ++++++---------------- fs/lustre/obdecho/echo_client.c | 2 +- fs/lustre/osc/osc_request.c | 2 +- 9 files changed, 18 insertions(+), 27 deletions(-) diff --git a/fs/lustre/include/obd.h b/fs/lustre/include/obd.h index 61fb815..3bdde31 100644 --- a/fs/lustre/include/obd.h +++ b/fs/lustre/include/obd.h @@ -99,8 +99,8 @@ struct obd_info { }; struct obd_type { - struct obd_ops *typ_dt_ops; - struct md_ops *typ_md_ops; + const struct obd_ops *typ_dt_ops; + const struct md_ops *typ_md_ops; struct dentry *typ_debugfs_entry; atomic_t typ_refcnt; struct lu_device_type *typ_lu; diff --git a/fs/lustre/include/obd_class.h b/fs/lustre/include/obd_class.h index a853ed5..a3394b2 100644 --- a/fs/lustre/include/obd_class.h +++ b/fs/lustre/include/obd_class.h @@ -60,7 +60,8 @@ /* genops.c */ struct obd_export *class_conn2export(struct lustre_handle *conn); -int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, +int class_register_type(const struct obd_ops *dt_ops, + const struct md_ops *md_ops, const char *name, struct lu_device_type *ldt); int class_unregister_type(const char *name); diff --git a/fs/lustre/lmv/lmv_obd.c b/fs/lustre/lmv/lmv_obd.c index aae80c7..64ebaf3 100644 --- a/fs/lustre/lmv/lmv_obd.c +++ b/fs/lustre/lmv/lmv_obd.c @@ -3043,7 +3043,7 @@ static int lmv_merge_attr(struct obd_export *exp, return 0; } -static struct obd_ops lmv_obd_ops = { +static const struct obd_ops lmv_obd_ops = { .owner = THIS_MODULE, .setup = lmv_setup, .cleanup = lmv_cleanup, @@ -3060,7 +3060,7 @@ static int lmv_merge_attr(struct obd_export *exp, .quotactl = lmv_quotactl }; -static struct md_ops lmv_md_ops = { +static const struct md_ops lmv_md_ops = { .get_root = lmv_get_root, .null_inode = lmv_null_inode, .close = lmv_close, diff --git a/fs/lustre/lov/lov_obd.c b/fs/lustre/lov/lov_obd.c index 203923f..652ed6a 100644 --- a/fs/lustre/lov/lov_obd.c +++ b/fs/lustre/lov/lov_obd.c @@ -1332,7 +1332,7 @@ static int lov_quotactl(struct obd_device *obd, struct obd_export *exp, return rc; } -static struct obd_ops lov_obd_ops = { +static const struct obd_ops lov_obd_ops = { .owner = THIS_MODULE, .setup = lov_setup, .cleanup = lov_cleanup, diff --git a/fs/lustre/mdc/mdc_request.c b/fs/lustre/mdc/mdc_request.c index 705a4e3..6f933b5 100644 --- a/fs/lustre/mdc/mdc_request.c +++ b/fs/lustre/mdc/mdc_request.c @@ -2571,7 +2571,7 @@ static int mdc_process_config(struct obd_device *obd, u32 len, void *buf) return count > 0 ? 0 : count; } -static struct obd_ops mdc_obd_ops = { +static const struct obd_ops mdc_obd_ops = { .owner = THIS_MODULE, .setup = mdc_setup, .precleanup = mdc_precleanup, @@ -2593,7 +2593,7 @@ static int mdc_process_config(struct obd_device *obd, u32 len, void *buf) .quotactl = mdc_quotactl, }; -static struct md_ops mdc_md_ops = { +static const struct md_ops mdc_md_ops = { .get_root = mdc_get_root, .null_inode = mdc_null_inode, .close = mdc_close, diff --git a/fs/lustre/mgc/mgc_request.c b/fs/lustre/mgc/mgc_request.c index d8be54d..1eca81a 100644 --- a/fs/lustre/mgc/mgc_request.c +++ b/fs/lustre/mgc/mgc_request.c @@ -1810,7 +1810,7 @@ static int mgc_process_config(struct obd_device *obd, u32 len, void *buf) return rc; } -static struct obd_ops mgc_obd_ops = { +static const struct obd_ops mgc_obd_ops = { .owner = THIS_MODULE, .setup = mgc_setup, .precleanup = mgc_precleanup, diff --git a/fs/lustre/obdclass/genops.c b/fs/lustre/obdclass/genops.c index 9c9ad9c..6d33414 100644 --- a/fs/lustre/obdclass/genops.c +++ b/fs/lustre/obdclass/genops.c @@ -141,8 +141,6 @@ static void class_sysfs_release(struct kobject *kobj) debugfs_remove_recursive(type->typ_debugfs_entry); - kfree(type->typ_md_ops); - kfree(type->typ_dt_ops); kfree(type); } @@ -153,7 +151,8 @@ static void class_sysfs_release(struct kobject *kobj) #define CLASS_MAX_NAME 1024 -int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, +int class_register_type(const struct obd_ops *dt_ops, + const struct md_ops *md_ops, const char *name, struct lu_device_type *ldt) { @@ -182,17 +181,8 @@ int class_register_type(struct obd_ops *dt_ops, struct md_ops *md_ops, type->typ_debugfs_entry = debugfs_create_dir(name, debugfs_lustre_root); - type->typ_dt_ops = kzalloc(sizeof(*type->typ_dt_ops), GFP_NOFS); - type->typ_md_ops = kzalloc(sizeof(*type->typ_md_ops), GFP_NOFS); - - if (!type->typ_dt_ops || - !type->typ_md_ops) - goto failed; - - *type->typ_dt_ops = *dt_ops; - /* md_ops is optional */ - if (md_ops) - *type->typ_md_ops = *md_ops; + type->typ_dt_ops = dt_ops; + type->typ_md_ops = md_ops; if (ldt) { type->typ_lu = ldt; @@ -223,8 +213,8 @@ int class_unregister_type(const char *name) CERROR("type %s has refcount (%d)\n", name, atomic_read(&type->typ_refcnt)); /* This is a bad situation, let's make the best of it */ /* Remove ops, but leave the name for debugging */ - kfree(type->typ_dt_ops); - kfree(type->typ_md_ops); + type->typ_dt_ops = NULL; + type->typ_md_ops = NULL; kobject_put(&type->typ_kobj); return -EBUSY; } diff --git a/fs/lustre/obdecho/echo_client.c b/fs/lustre/obdecho/echo_client.c index 317123f..baf34c8 100644 --- a/fs/lustre/obdecho/echo_client.c +++ b/fs/lustre/obdecho/echo_client.c @@ -1676,7 +1676,7 @@ static int echo_client_disconnect(struct obd_export *exp) return rc; } -static struct obd_ops echo_client_obd_ops = { +static const struct obd_ops echo_client_obd_ops = { .owner = THIS_MODULE, .iocontrol = echo_client_iocontrol, .connect = echo_client_connect, diff --git a/fs/lustre/osc/osc_request.c b/fs/lustre/osc/osc_request.c index 104bf43..9484b9a 100644 --- a/fs/lustre/osc/osc_request.c +++ b/fs/lustre/osc/osc_request.c @@ -2988,7 +2988,7 @@ static int osc_process_config(struct obd_device *obd, u32 len, void *buf) return osc_process_config_base(obd, buf); } -static struct obd_ops osc_obd_ops = { +static const struct obd_ops osc_obd_ops = { .owner = THIS_MODULE, .setup = osc_setup, .precleanup = osc_precleanup,